Series excited motor control circuit and stirring device
阅读说明：本技术 一种串激马达控制电路及搅拌装置 (Series excited motor control circuit and stirring device ) 是由 冯钟祥 黄信民 蔡传斌 于 2019-03-21 设计创作，主要内容包括：本发明涉及一种串激马达控制电路及搅拌装置,包括：直流电源产生电路、与直流电源产生电路连接的开关电路、驱动控制电路、分别与开关电路和驱动控制电路连接的安全检测电路、以及分别与开关电路连接的驱动装置；直流电源产生电路连接交流电源、以对所接收的交流电进行整流处理后输出直流电；安全检测电路在搅拌装置出现安全隐患时,输出切断信号至开关电路和输出状态信号至驱动控制电路；驱动控制电路根据状态信号输出控制信号至开关电路,以控制开关电路根据切断信号和控制信号制动驱动装置。本发明可以低成本、高可靠性的方式实现对串激马达的运转和制动的切换控制,安全性能好。(The invention relates to a series motor control circuit and a stirring device, comprising: the safety detection circuit comprises a direct-current power supply generating circuit, a switching circuit connected with the direct-current power supply generating circuit, a driving control circuit, a safety detection circuit respectively connected with the switching circuit and the driving control circuit, and a driving device respectively connected with the switching circuit; the direct current power supply generating circuit is connected with the alternating current power supply to output direct current after rectifying the received alternating current; when potential safety hazards appear on the stirring device, the safety detection circuit outputs a cut-off signal to the switch circuit and outputs a state signal to the drive control circuit; the drive control circuit outputs a control signal to the switch circuit according to the state signal so as to control the switch circuit to brake the driving device according to the cut-off signal and the control signal. The invention can realize the switching control of the operation and the braking of the series motor in a low-cost and high-reliability mode, and has good safety performance.)
1. A series motor control circuit is applied to agitating unit, its characterized in that includes: the safety detection circuit comprises a direct-current power supply generating circuit, a switching circuit connected with the direct-current power supply generating circuit, a driving control circuit, a safety detection circuit respectively connected with the switching circuit and the driving control circuit, and a driving device respectively connected with the switching circuit;
the direct current power supply generating circuit is connected with an alternating current power supply to rectify the received alternating current and output direct current;
when potential safety hazards appear on the stirring device, the safety detection circuit outputs a cut-off signal to the switch circuit and outputs a state signal to the drive control circuit;
and the drive control circuit outputs a control signal to the switch circuit according to the state signal so as to control the switch circuit to brake the driving device according to the cut-off signal and the control signal.
2. The series motor control circuit of claim 1, wherein the safety detection circuit comprises: the detection device, the second diode, the fourth capacitor and the twelfth resistor;
one end of the detection device is connected with a low-voltage direct-current power supply, the other end of the detection device is connected with the anode of the second diode, the cathode of the second diode is connected with the first end of the twelfth resistor, the second end of the twelfth resistor is grounded, and the fourth capacitor is connected with the twelfth resistor in parallel;
the detection device is connected with the switch circuit through the connecting end of the anode of the second diode, and the connecting end of the cathode of the second diode and the first end of the twelfth resistor is connected with the drive control circuit so as to respectively output the cut-off signal to the switch circuit and output the state signal to the drive control circuit.
3. A series motor control circuit according to claim 2, wherein the detection means comprises a micro switch or a hall detector.
4. The series motor control circuit of claim 1, wherein the switching circuit comprises a first switching circuit, a second switching circuit, and a third switching circuit, and the control signals comprise a first control signal, a second control signal, and a third control signal;
the first switch circuit is connected between the alternating current power supply and the direct current power supply generating circuit and is respectively connected with the safety detection circuit and the driving control circuit;
the second switch circuit is connected between the direct-current power supply generating circuit and the driving device and is respectively connected with the safety detection circuit and the driving control circuit;
the third switch circuit is connected between the safety detection circuit and the driving device and is respectively connected with the output ends of the driving control circuit and the direct-current power supply generating circuit;
when the safety detection circuit outputs a cut-off signal and a state signal, the drive control circuit outputs a first control signal and a second control signal to the first switch circuit, outputs a first control signal to the second switch circuit and outputs a third control signal to the third switch circuit according to the state signal, and controls the first switch circuit, the second switch circuit and the third switch circuit to be matched so as to brake the driving device.
5. The series motor control circuit of claim 4, wherein the first switching circuit comprises a micro switch or a relay.
6. The series motor control circuit of claim 5, further comprising: and the zero-crossing detection circuit is respectively connected with the alternating current power supply and the drive control circuit and is used for detecting whether the stirring device is abnormal or not.
7. The series motor control circuit of claim 6, wherein the zero-crossing detection circuit comprises: a twenty-seventh resistor, a twenty-ninth resistor, an eighth diode, a fifth optocoupler, a twenty-sixth resistor, a twenty-eighth resistor and an eighth capacitor;
the first end of twenty-seventh resistance is connected the first end of alternating current power supply, the first end of fifth opto-coupler is connected to the second end of twenty-seventh resistance, the negative pole of eighth diode is connected the second end of alternating current power supply, the first end of twenty-ninth resistance is connected to the positive pole of eighth diode, the second end of twenty-ninth resistance is connected the third end of fifth opto-coupler, the second end of fifth opto-coupler is connected the second end of twenty-sixth resistance with the first end of twenty-eighth resistance, the fourth end ground connection of fifth opto-coupler, the first end of twenty-sixth resistance connects low voltage direct current power supply, the second end of twenty-eighth resistance is connected drive control circuit, the first end of eighth electric capacity is connected the second end of twenty-eighth resistance, the second end ground connection of eighth electric capacity.
8. The series motor control circuit of claim 4, wherein the first switching circuit comprises: the circuit comprises a first resistor, a photoelectric coupler, a first triode, a second resistor, a third resistor, a second triode, a fourth resistor, a fifth resistor, an eighth resistor, a ninth resistor, a thyristor and a piezoresistor;
the first end of the controlled silicon is connected with the first end of the alternating current power supply, the second end of the controlled silicon is respectively connected with the second end of the ninth resistor and the first input end of the direct current power supply generating circuit, the voltage dependent resistor is connected in parallel with the first end and the second end of the controlled silicon, the third end of the controlled silicon is connected with the third end of the photoelectric coupler through the eighth resistor, and the first end of the ninth resistor is connected with the fourth end of the photoelectric coupler;
the first end of the photoelectric coupler is connected with the safety detection circuit through the first resistor, the second end of the photoelectric coupler is connected with the collector electrode of the first triode, the base electrode of the first triode is connected with the first control output end of the drive control circuit through the second resistor, the emitter electrode of the first triode is connected with the collector electrode of the second triode, the first end of the third resistor is connected with the base electrode of the first triode, and the second end of the third resistor is grounded;
the emitting electrode of the second triode is grounded, the base electrode of the second triode is connected with the second control output end of the drive control circuit through the fourth resistor, and the fifth resistor is connected between the base electrode and the emitting electrode of the second triode.
9. The series motor control circuit of claim 4, wherein the second switching circuit comprises a control switch, a connection circuit, and a delay circuit;
the first end of the control switch is connected with a low-voltage direct-current power supply, and the second end of the control switch is connected with the first control output end of the driving control circuit through the connecting circuit; the first end of the delay circuit is connected with the safety detection circuit, and the second end of the delay circuit is connected with the connecting circuit.
10. The series motor control circuit of claim 9, wherein the control switch comprises an ac relay, the connection circuit comprises a third transistor, a thirteenth resistor, and a fourteenth resistor, and the delay circuit comprises a fourth transistor, a fifth transistor, a fifteenth resistor, a sixteenth resistor, a capacitor EC3, a fourth diode, and a seventeenth resistor;
a first end of the alternating current relay is connected with a low-voltage direct current power supply, a second end of the alternating current relay is connected with a collector electrode of the third triode, a base electrode of the third triode is connected with a first control output end of the driving control circuit through the thirteenth resistor, an emitter electrode of the third triode is connected with a collector electrode of the fifth triode, a first end of the fourteenth resistor is connected with a base electrode of the third triode, and a second end of the fourteenth resistor is grounded;
an emitting electrode of the fifth triode is grounded, a base electrode of the fifth triode is connected with an emitting electrode of the fourth triode, a collector electrode of the fourth triode is respectively connected with an emitting electrode of the third triode and a collector electrode of the fifth triode, a base electrode of the fourth triode is connected with a first end of a fifteenth resistor, a second end of the fifteenth resistor is connected with a cathode of a fourth diode, and an anode of the fourth diode is connected with the safety detection circuit;
a first end of the sixteenth resistor is connected to the base of the fourth triode, a second end of the sixteenth resistor and a second end of the capacitor EC3 are commonly grounded, and a first end of the capacitor EC3 is connected between a second end of the fifteenth resistor and the cathode of the fourth diode;
the third end of the alternating current relay is connected with the first end of the driving device, the fourth end of the alternating current relay is connected with the second end of the driving device, the fifth end of the alternating current relay is connected with the direct current power supply generating circuit, the sixth end of the alternating current relay is connected with the third end of the driving device through the seventeenth resistor, the seventh end of the alternating current relay is connected with the third end of the driving device, and the eighth end of the alternating current relay is connected with the fourth end of the driving device.
11. The series motor control circuit of claim 4, wherein the third switch circuit comprises: the circuit comprises a sixth diode, a third inductor, a sixth capacitor, a twentieth resistor, a seventh diode, a seventh capacitor, a transistor, a voltage regulator tube, a twenty-second resistor, a twenty-fourth resistor, a fifth capacitor, an optocoupler driver, a sixth triode, a twenty-first resistor, a nineteenth resistor, a seventh triode, an eighteenth resistor, a twenty-third resistor and a twenty-fifth resistor;
a cathode of the sixth diode, a first end of the third inductor, and a first end of the sixth capacitor are commonly connected to a fifth end of the driving device, an anode of the sixth diode, a second end of the third inductor, and a second end of the sixth capacitor are connected to a drain of the transistor, an anode of the seventh diode is connected to the drain of the transistor, a cathode of the seventh diode is grounded through the seventh capacitor, and the twentieth resistor is connected in parallel with the seventh diode;
the source electrode of the transistor is grounded, the grid electrode of the transistor is connected with the fifth end of the optical coupler driver through the twenty-second resistor, the grid electrode of the transistor is also grounded through the twenty-fourth resistor, the voltage regulator tube is connected between the grid electrode and the source electrode of the transistor, the fourth end of the optical coupler driver is grounded, the sixth end of the optical coupler driver is connected with the output end of the direct-current power supply generation circuit, and the sixth end of the optical coupler driver is grounded through the fifth capacitor;
the first end of the optocoupler driver is connected with a low-voltage direct-current power supply and the first end of the eighteenth resistor, the third end of the optocoupler driver is connected with the emitting electrode of the sixth triode and the first end of the twenty-first resistor, the collecting electrode of the sixth triode is connected with the low-voltage direct-current power supply and the first end of the optocoupler driver, the base electrode of the sixth triode is connected with the first end of the nineteenth resistor, the second end of the nineteenth resistor is connected with the third control output end of the drive control circuit, and the second end of the eighteenth resistor is connected with the second end of the nineteenth resistor;
the second end of the twenty-first resistor is connected with the collector electrode of the seventh triode, the emitter electrode of the seventh triode is grounded, the base electrode of the seventh triode is connected with the safety detection circuit through the twenty-third resistor, and the twenty-fifth resistor is connected between the base electrode and the emitter electrode of the seventh triode.
12. The series motor control circuit according to claim 4, wherein the dc power supply generation circuit includes: a rectification output circuit and a power supply circuit;
the first input end of the rectification output circuit is connected with the first switch circuit, the second input end of the rectification output circuit is connected with the second end of the alternating current power supply, the first output end of the rectification output circuit is connected with the second switch circuit and the first input end of the power supply circuit, the second output end of the rectification output circuit is connected with the second input end of the power supply circuit, and the output end of the power supply circuit is connected with the third switch circuit.
13. The series motor control circuit of claim 1, wherein the drive device is a series motor.
14. A mixing apparatus comprising a series motor control circuit as claimed in any one of claims 1 to 13.
Technical Field
The invention relates to the field of drive control, in particular to a series motor control circuit and a stirring device.
Background
Most of the existing kitchen stirring products use series excited motors with simple structures and low price. According to the requirements of safety regulations, if the mixing cup loosens or moves away during the mixing process, the motor must reduce the speed to zero within a specified time (generally set to 2 seconds). Therefore, the inertia alone cannot satisfy this requirement, which requires the motor to have a braking function.
For a motor with a braking function, a relay is used for switching operation and the braking function in the prior common method, but if a direct-current power supply is used as a power supply, a high-voltage direct-current relay is selected in the conventional method, but the high-voltage direct-current relay is very expensive, and the volume of the high-voltage direct-current relay is many times larger than that of an alternating-current relay under the same specification, so that the prior method has high cost and large volume and is not beneficial to being widely applied to stirring products.
Disclosure of Invention
The present invention is directed to a series motor control circuit and a stirring device, which overcome the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a series motor control circuit is applied to agitating unit, includes: the safety detection circuit comprises a direct-current power supply generating circuit, a switching circuit connected with the direct-current power supply generating circuit, a driving control circuit, a safety detection circuit respectively connected with the switching circuit and the driving control circuit, and a driving device respectively connected with the switching circuit;
the direct current power supply generating circuit is connected with an alternating current power supply to rectify the received alternating current and output direct current;
when potential safety hazards appear on the stirring device, the safety detection circuit outputs a cut-off signal to the switch circuit and outputs a state signal to the drive control circuit;
and the drive control circuit outputs a control signal to the switch circuit according to the state signal so as to control the switch circuit to brake the driving device according to the cut-off signal and the control signal.
Preferably, the safety detection circuit includes: the detection device, the second diode, the fourth capacitor and the twelfth resistor;
one end of the detection device is connected with a low-voltage direct-current power supply, the other end of the detection device is connected with the anode of the second diode, the cathode of the second diode is connected with the first end of the twelfth resistor, the second end of the twelfth resistor is grounded, and the fourth capacitor is connected with the twelfth resistor in parallel;
the detection device is connected with the switch circuit through the connecting end of the anode of the second diode, and the connecting end of the cathode of the second diode and the first end of the twelfth resistor is connected with the drive control circuit so as to respectively output the cut-off signal to the switch circuit and output the state signal to the drive control circuit.
Preferably, the detection means comprises a microswitch or a hall detector.
Preferably, the switching circuit includes a first switching circuit, a second switching circuit, and a third switching circuit, and the control signal includes a first control signal, a second control signal, and a third control signal;
the first switch circuit is connected between the alternating current power supply and the direct current power supply generating circuit and is respectively connected with the safety detection circuit and the driving control circuit;
the second switch circuit is connected between the direct-current power supply generating circuit and the driving device and is respectively connected with the safety detection circuit and the driving control circuit;
the third switch circuit is connected between the safety detection circuit and the driving device and is respectively connected with the output ends of the driving control circuit and the direct-current power supply generating circuit;
when the safety detection circuit outputs a cut-off signal and a state signal, the drive control circuit outputs a first control signal and a second control signal to the first switch circuit, outputs a first control signal to the second switch circuit and outputs a third control signal to the third switch circuit according to the state signal, and controls the first switch circuit, the second switch circuit and the third switch circuit to be matched so as to brake the driving device.
Preferably, the first switching circuit comprises a micro switch or a relay.
Preferably, the method further comprises the following steps: and the zero-crossing detection circuit is respectively connected with the alternating current power supply and the drive control circuit and is used for detecting whether the stirring device is abnormal or not.
Preferably, the zero-cross detection circuit includes: a twenty-seventh resistor, a twenty-ninth resistor, an eighth diode, a fifth optocoupler, a twenty-sixth resistor, a twenty-eighth resistor and an eighth capacitor;
the first end of twenty-seventh resistance is connected the first end of alternating current power supply, the first end of fifth opto-coupler is connected to the second end of twenty-seventh resistance, the negative pole of eighth diode is connected the second end of alternating current power supply, the first end of twenty-ninth resistance is connected to the positive pole of eighth diode, the second end of twenty-ninth resistance is connected the third end of fifth opto-coupler, the second end of fifth opto-coupler is connected the second end of twenty-sixth resistance with the first end of twenty-eighth resistance, the fourth end ground connection of fifth opto-coupler, the first end of twenty-sixth resistance connects low voltage direct current power supply, the second end of twenty-eighth resistance is connected drive control circuit, the first end of eighth electric capacity is connected the second end of twenty-eighth resistance, the second end ground connection of eighth electric capacity.
Preferably, the first switching circuit includes: the circuit comprises a first resistor, a photoelectric coupler, a first triode, a second resistor, a third resistor, a second triode, a fourth resistor, a fifth resistor, an eighth resistor, a ninth resistor, a thyristor and a piezoresistor;
the first end of the controlled silicon is connected with the first end of the alternating current power supply, the second end of the controlled silicon is respectively connected with the second end of the ninth resistor and the first input end of the direct current power supply generating circuit, the voltage dependent resistor is connected in parallel with the first end and the second end of the controlled silicon, the third end of the controlled silicon is connected with the third end of the photoelectric coupler through the eighth resistor, and the first end of the ninth resistor is connected with the fourth end of the photoelectric coupler;
the first end of the photoelectric coupler is connected with the safety detection circuit through the first resistor, the second end of the photoelectric coupler is connected with the collector electrode of the first triode, the base electrode of the first triode is connected with the first control output end of the drive control circuit through the second resistor, the emitter electrode of the first triode is connected with the collector electrode of the second triode, the first end of the third resistor is connected with the base electrode of the first triode, and the second end of the third resistor is grounded;
the emitting electrode of the second triode is grounded, the base electrode of the second triode is connected with the second control output end of the drive control circuit through the fourth resistor, and the fifth resistor is connected between the base electrode and the emitting electrode of the second triode.
Preferably, the second switch circuit comprises a control switch, a connection circuit and a delay circuit;
the first end of the control switch is connected with a low-voltage direct-current power supply, and the second end of the control switch is connected with the first control output end of the driving control circuit through the connecting circuit; the first end of the delay circuit is connected with the safety detection circuit, and the second end of the delay circuit is connected with the connecting circuit.
Preferably, the control switch comprises an ac relay, the connection circuit comprises a third triode, a thirteenth resistor and a fourteenth resistor, and the delay circuit comprises a fourth triode, a fifth triode, a fifteenth resistor, a sixteenth resistor, a capacitor EC3, a fourth diode and a seventeenth resistor;
a first end of the alternating current relay is connected with a low-voltage direct current power supply, a second end of the alternating current relay is connected with a collector electrode of the third triode, a base electrode of the third triode is connected with a first control output end of the driving control circuit through the thirteenth resistor, an emitter electrode of the third triode is connected with a collector electrode of the fifth triode, a first end of the fourteenth resistor is connected with a base electrode of the third triode, and a second end of the fourteenth resistor is grounded;
an emitting electrode of the fifth triode is grounded, a base electrode of the fifth triode is connected with an emitting electrode of the fourth triode, a collector electrode of the fourth triode is respectively connected with an emitting electrode of the third triode and a collector electrode of the fifth triode, a base electrode of the fourth triode is connected with a first end of a fifteenth resistor, a second end of the fifteenth resistor is connected with a cathode of a fourth diode, and an anode of the fourth diode is connected with the safety detection circuit;
a first end of the sixteenth resistor is connected to the base of the fourth triode, a second end of the sixteenth resistor and a second end of the capacitor EC3 are commonly grounded, and a first end of the capacitor EC3 is connected between a second end of the fifteenth resistor and the cathode of the fourth diode;
the third end of the alternating current relay is connected with the first end of the driving device, the fourth end of the alternating current relay is connected with the second end of the driving device, the fifth end of the alternating current relay is connected with the direct current power supply generating circuit, the sixth end of the alternating current relay is connected with the third end of the driving device through the seventeenth resistor, the seventh end of the alternating current relay is connected with the third end of the driving device, and the eighth end of the alternating current relay is connected with the fourth end of the driving device.
Preferably, the third switching circuit includes: the circuit comprises a sixth diode, a third inductor, a sixth capacitor, a twentieth resistor, a seventh diode, a seventh capacitor, a transistor, a voltage regulator tube, a twenty-second resistor, a twenty-fourth resistor, a fifth capacitor, an optocoupler driver, a sixth triode, a twenty-first resistor, a nineteenth resistor, a seventh triode, an eighteenth resistor, a twenty-third resistor and a twenty-fifth resistor;
a cathode of the sixth diode, a first end of the third inductor, and a first end of the sixth capacitor are commonly connected to a fifth end of the driving device, an anode of the sixth diode, a second end of the third inductor, and a second end of the sixth capacitor are connected to a drain of the transistor, an anode of the seventh diode is connected to the drain of the transistor, a cathode of the seventh diode is grounded through the seventh capacitor, and the twentieth resistor is connected in parallel with the seventh diode;
the source electrode of the transistor is grounded, the grid electrode of the transistor is connected with the fifth end of the optical coupler driver through the twenty-second resistor, the grid electrode of the transistor is also grounded through the twenty-fourth resistor, the voltage regulator tube is connected between the grid electrode and the source electrode of the transistor, the fourth end of the optical coupler driver is grounded, the sixth end of the optical coupler driver is connected with the output end of the direct-current power supply generation circuit, and the sixth end of the optical coupler driver is grounded through the fifth capacitor;
the first end of the optocoupler driver is connected with a low-voltage direct-current power supply and the first end of the eighteenth resistor, the third end of the optocoupler driver is connected with the emitting electrode of the sixth triode and the first end of the twenty-first resistor, the collecting electrode of the sixth triode is connected with the low-voltage direct-current power supply and the first end of the optocoupler driver, the base electrode of the sixth triode is connected with the first end of the nineteenth resistor, the second end of the nineteenth resistor is connected with the third control output end of the drive control circuit, and the second end of the eighteenth resistor is connected with the second end of the nineteenth resistor;
the second end of the twenty-first resistor is connected with the collector electrode of the seventh triode, the emitter electrode of the seventh triode is grounded, the base electrode of the seventh triode is connected with the safety detection circuit through the twenty-third resistor, and the twenty-fifth resistor is connected between the base electrode and the emitter electrode of the seventh triode.
Preferably, the dc power generating circuit includes: a rectification output circuit and a power supply circuit;
the first input end of the rectification output circuit is connected with the first switch circuit, the second input end of the rectification output circuit is connected with the second end of the alternating current power supply, the first output end of the rectification output circuit is connected with the second switch circuit and the first input end of the power supply circuit, the second output end of the rectification output circuit is connected with the second input end of the power supply circuit, and the output end of the power supply circuit is connected with the third switch circuit.
Preferably, the drive means is a series motor.
The invention also provides a stirring device which comprises the series motor control circuit.
The series motor control circuit has the following beneficial effects: the invention adopts the safety detection circuit to detect the potential safety hazard of the stirring device, immediately outputs the cut-off signal and the control signal when the stirring device has the potential safety hazard so as to cut off the input of alternating current and realize the braking of the driving device so as to avoid the danger.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a logic block diagram of a series motor control circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a part of a circuit of a series motor control circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a safety detection circuit and a drive control circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problem that when potential safety hazards (such as loosening or moving a stirring cup and the like) occur in the existing stirring products, the motor is required to reduce the speed to zero within a set time so as to avoid danger, the invention provides a series motor control circuit, which can realize switching control of the operation and braking (braking) of the motor in a low-price, high-safety and good-reliability mode and ensure safe and reliable operation of the products.
Referring to fig. 1, a logic block diagram of a series motor control circuit according to an embodiment of the present invention is shown. The series motor control circuit can be applied to stirring products, such as a stirrer, a soybean milk machine, a wall breaking machine, an automatic cooker and the like.
As shown in fig. 1, the series motor control circuit includes: a direct-current power supply generation circuit 30, a switching circuit connected to the direct-current power supply generation circuit 30, a
Specifically, the
Further, the
Further, as shown in fig. 1, the switching circuit of the embodiment of the present invention may include: a first switch circuit 20, a second switch circuit 40, and a third switch circuit 80. The control signals include a first control signal (RLY _ CTRL), a second control signal (SR _ CTRL), and a third control signal (MOTOR _ CTRL).
Specifically, the first switch circuit 20 is connected between the ac power supply 10 and the dc power supply generating circuit 30, and is respectively connected to the
In the embodiment of the present invention, the first switch circuit 20 is used to turn on or off the ac power supply 10, specifically, when the stirring device works normally, the first switch circuit 20 turns on the ac power supply 10 to ensure the normal power supply of the stirring device; when the stirring device has a potential safety hazard (such as the stirring cup is loosened or moved), the first switch circuit 20 disconnects the alternating current power supply 10 to cut off the power supply of the stirring device. Optionally, the first switching circuit 20 according to the embodiment of the present invention may be implemented by using a micro switch or a relay to implement input control on the ac power supply 10, or may be implemented by using a related switching circuit.
In the embodiment of the present invention, the dc power generating circuit 30 is configured to generate a dc power obtained by rectifying the ac power 10.
In the embodiment of the present invention, the second switch circuit 40 is used to switch the operation and braking of the driving device 50, so as to cooperate with the first switch circuit 20 and the third switch circuit 80 to realize the braking control of the driving device 50 when the stirring device has a potential safety hazard, thereby avoiding the occurrence of a danger.
The third switch circuit 80 is used for controlling the driving device 50 to be turned on and off, and simultaneously controlling the rotating speed thereof, and is matched with the first switch circuit 20 and the second switch circuit 40 to realize the brake control of the driving device 50.
The
The control chip U2 is configured to output a first control signal to the first switch circuit 20 and the second switch circuit 40, output a second control signal to the first switch circuit 20, and output a third control signal to the third switch circuit 80 according to the received status signal when the stirring apparatus has a potential safety hazard, so as to control the first switch circuit 20, the second switch circuit 40, and the third switch circuit 80 to enter a braking function in a matching manner, thereby implementing braking control on the driving apparatus 50, and enabling the driving apparatus 50 to be quickly stopped. When a potential safety hazard occurs, the first switch circuit 20 and the third switch circuit 80 are disconnected first, and then the second switch circuit 40 is disconnected after time delay, so that the control switch 401 in the second switch circuit 40 is not damaged.
Fig. 2 and 3 show a preferred embodiment of the series motor control circuit provided by the present invention.
As shown in fig. 3, the
One end of the detection device is connected with a low-voltage direct-current power supply (VDD), the other end of the detection device is connected with the anode of a second diode D2, the cathode of a second diode D2 is connected with the first end of a twelfth resistor R12, the second end of the twelfth resistor R12 is grounded, and a fourth capacitor C4 is connected with a twelfth resistor R12 in parallel; the connection end of the detection device and the anode of the second diode D2 is connected with the switch circuit, the connection end of the cathode of the second diode D2 and the first end of the twelfth resistor R12 is connected with the driving
As shown in fig. 2, the first switching circuit 20 includes: the circuit comprises a first resistor R1, a photoelectric coupler U1, a first triode Q1, a second resistor R2, a third resistor R3, a second triode Q2, a fourth resistor R4, a fifth resistor R5, an eighth resistor R8, a ninth resistor R9, a thyristor SR1 and a
The first end of the controlled silicon SR1 is connected with the first end of the alternating current power supply 10, the second end of the controlled silicon SR1 is respectively connected with the second end of the ninth resistor R9 and the first input end of the direct current power supply generating circuit 30, the voltage dependent resistor ZR1 is connected in parallel with the first end and the second end of the controlled silicon SR1, the third end of the controlled silicon SR1 is connected with the third end of the photoelectric coupler U1 through the eighth resistor R8, and the first end of the ninth resistor R9 is connected with the fourth end of the photoelectric coupler U1; a first end of the photocoupler U1 is connected to the safety detection circuit 70 (specifically, connected to the anode of the second diode D2, as shown in fig. 3) through a first resistor R1, a second end of the photocoupler U1 is connected to the collector of the first triode Q1, the base of the first triode Q1 is connected to the first control output end of the driving control circuit 60 through a second resistor R2, the emitter of the first triode Q1 is connected to the collector of the second triode Q2, a first end of the third resistor R3 is connected to the base of the first triode Q1, and a second end of the third resistor R3 is grounded; the emitter of the second transistor Q2 is grounded, the base of the second transistor Q2 is connected to the second control output terminal of the driving control circuit 60 through a fourth resistor R4, and the fifth resistor R5 is connected between the base and the emitter of the second transistor Q2.
As shown in fig. 2, the second switch circuit 40 includes a control switch 401, a connection circuit, and a delay circuit.
A first end of the control switch 401 is connected with a low-voltage direct-current power supply, and a second end of the control switch 401 is connected with a first control output end of the driving
In this embodiment, the control switch 401 includes an ac relay, the connection circuit includes a third transistor Q3, a thirteenth resistor R13 and a fourteenth resistor R14, and the delay circuit includes a fourth transistor Q4, a fifth transistor Q5, a fifteenth resistor R15, a sixteenth resistor R16, a capacitor EC3, a fourth diode D4 and a seventeenth resistor R17.
The first end of the alternating current relay is connected with a low-voltage direct current power supply, the second end of the alternating current relay is connected with the collector of a third triode Q3, the base of a third triode Q3 is connected with the first control output end of the driving control circuit 60 through a thirteenth resistor R13, the emitter of the third triode Q3 is connected with the collector of a fifth triode Q5, the first end of a fourteenth resistor R14 is connected with the base of a third triode Q3, and the second end of the fourteenth resistor R14 is grounded; an emitter of the fifth triode Q5 is grounded, a base of the fifth triode Q5 is connected to an emitter of the fourth triode Q4, a collector of the fourth triode Q4 is connected to an emitter of the third triode Q3 and a collector of the fifth triode Q5, respectively, a base of the fourth triode Q4 is connected to a first end of a fifteenth resistor R15, a second end of the fifteenth resistor R15 is connected to a cathode of a fourth diode D4, and an anode of the fourth diode D4 is connected to the safety detection circuit 70 (specifically, connected to an anode of the second diode D2, as shown in fig. 3); a first end of the sixteenth resistor R16 is connected to the base of the fourth transistor Q4, a second end of the sixteenth resistor R16 and a second end of the capacitor EC3 are commonly grounded, and a first end of the capacitor EC3 is connected between a second end of the fifteenth resistor R15 and a cathode of the fourth diode D4.
The third end of the alternating current relay is connected with the first end of the driving device 50, the fourth end of the alternating current relay is connected with the second end of the driving device 50, the fifth end of the alternating current relay is connected with the direct current power supply generating circuit 30, the sixth end of the alternating current relay is connected with the third end of the driving device 50 through a seventeenth resistor R17, the seventh end of the alternating current relay is connected with the third end of the driving device 50, and the eighth end of the alternating current relay is connected with the fourth end of the driving device 50.
In the embodiment of the present invention, the delay circuit can ensure that the ac relay operates under normal voltage, and the seventeenth resistor R17 can limit the current flowing through the driving device 50 (i.e., the motor) from being too large when the driving device 50 is in the braking state (braking state). Preferably, the driving device 50 according to the embodiment of the present invention is a series motor.
As shown in fig. 2, the third switching circuit 80 includes: the circuit comprises a sixth diode D6, a third inductor L3, a sixth capacitor C6, a twentieth resistor R20, a seventh diode D7, a seventh capacitor C7, a transistor, a voltage regulator ZD1, a twenty-second resistor R22, a twenty-fourth resistor R24, a fifth capacitor C5, an optocoupler driver U4, a sixth triode Q6, a twenty-first resistor R21, a nineteenth resistor R19, a seventh triode Q7, an eighteenth resistor R18, a twenty-third resistor R23 and a twenty-fifth resistor R25.
A cathode of the sixth diode D6, a first end of the third inductor L3, and a first end of the sixth capacitor C6 are commonly connected to the fifth end of the driving device 50, an anode of the sixth diode D6, a second end of the third inductor L3, and a second end of the sixth capacitor C6 are connected to a drain of the transistor, an anode of the seventh diode D7 is connected to a drain of the transistor, a cathode of the seventh diode D7 is grounded through the seventh capacitor C7, and the twentieth resistor R20 is connected in parallel to the seventh diode D7; the source electrode of the transistor is grounded, the grid electrode of the transistor is connected with the fifth end of the optical coupling driver U4 through a twenty-second twelve resistor R22, the grid electrode of the transistor is grounded through a twenty-fourth resistor R24, the voltage regulator tube ZD1 is connected between the grid electrode and the source electrode of the transistor, the fourth end of the optical coupling driver U4 is grounded, the sixth end of the optical coupling driver U4 is connected with the output end of the direct-current power supply generation circuit 30, and the sixth end of the optical coupling driver U4 is grounded through a fifth capacitor C5.
The first end of the optocoupler driver U4 is connected with a low-voltage direct-current power supply and the first end of an eighteenth resistor R18, the third end of the optocoupler driver U4 is connected with the emitter of a sixth triode Q6 and the first end of a twenty-first resistor R21, the collector of a sixth triode Q6 is connected with the low-voltage direct-current power supply and the first end of an optocoupler driver U4, the base of the sixth triode Q6 is connected with the first end of a nineteenth resistor R19, the second end of the nineteenth resistor R19 is connected with the third control output end of the drive control circuit 60, and the second end of the eighteenth resistor R18 is connected with the second end of a nineteenth resistor R19; the second end of the twenty-first resistor R21 is connected to the collector of the seventh transistor Q7, the emitter of the seventh transistor Q7 is grounded, the base of the seventh transistor Q7 is connected to the safety detection circuit 70 (specifically, to the anode of the second diode D2 (i.e., the first output end of the safety detection circuit 70) through the twenty-third resistor R23, as shown in fig. 3), and the twenty-fifth resistor R25 is connected between the base and the emitter of the seventh transistor Q7.
In the embodiment of the invention, the transistor is an insulated double-gate transistor IGBT.
As shown in fig. 2, the dc power generating circuit 30 includes: a rectification output circuit and a power supply circuit.
The first input end of the rectification output circuit is connected with the first switch circuit 20, the second input end of the rectification output circuit is connected with the second end of the alternating current power supply 10, the first output end of the rectification output circuit is connected with the second switch circuit 40 and the first input end of the power supply circuit, the second output end of the rectification output circuit is connected with the second input end of the power supply circuit, and the output end of the power supply circuit is connected with the third switch circuit 80.
As shown in fig. 2, the rectified output circuit includes a rectifying bridge BD1, a resistor RT1, a capacitor EC1, a third capacitor C3, a tenth resistor R10, and an eleventh resistor R11. The power supply circuit comprises a power supply chip U3, a first capacitor C1, a sixth resistor R6, a seventh resistor R7, a second capacitor C2, a first diode D1, a second inductor L2, a capacitor EC2 and a
A first input end of the rectifier bridge BD1 is used as a first input end of the rectification output circuit and is connected with a second end of the piezoresistor ZR1 and a second end of the controllable silicon SR1, and a second input end of the rectifier bridge BD1 is used as a second input end of the rectification output circuit and is connected with a second end of the alternating current power supply 10; a first output end of the rectifier bridge BD1 is used as a first output end of the rectification output circuit and is connected with a fifth end of the alternating current relay and a first input end of the power circuit (namely a 4 th pin of the power chip U3) through a resistor RT1, and a second output end of the rectifier bridge BD1 is used as a second output end of the rectification output circuit and is connected with an anode of the diode PD 1; a first end of the tenth resistor R10 is connected to the second end of the resistor RT1, a second end of the tenth resistor R10 is connected to a first end of the eleventh resistor R11, and a second end of the eleventh resistor R11 is grounded; the third capacitor C3 and the capacitor EC1 are connected in parallel to a first end of the tenth resistor R10 and a second end of the eleventh resistor R11 in sequence.
The first pin 1 of the power chip U3 is connected with the first pin 8 thereof through a first capacitor C1, the pin 2 of the power chip is connected with the first end of a sixth resistor R6, the second end of a sixth resistor R6 is connected with the pin 8 of the power chip U3, the first end of a sixth resistor R6 is further connected with the pin 5 of the power chip U3 through a seventh resistor R7 and a second capacitor C2 in sequence, the cathode of a diode PD1 is connected with the pin 5 of the power chip U3, the pin 5, the pin 6, the pin 7 and the pin 8 of the power chip U3 are in short circuit, the pin 5 of the power chip U3 is further grounded through a second inductor L2 and a capacitor EC2 in sequence, the cathode of a first diode D1 is connected with the connecting end of a seventh resistor R7 and a second capacitor C2, the anode of a first diode D1 is connected with the connecting end of a second inductor L2 and a capacitor EC2, wherein the connecting end of the second inductor L2 and the connecting end of the capacitor EC2 are used as the optical coupling end 4 of the power supply circuit U2, for outputting a high voltage direct current (VCC to the third switch circuit 80).
Further, in another embodiment, when the first switching circuit is implemented by a micro switch or a relay, the series motor control circuit further includes: a zero crossing detection circuit 90. The zero-cross detection circuit 90 is connected to the ac power supply 10 and the
In a preferred embodiment, as shown in fig. 2, the zero-crossing detection circuit 90 includes: a twenty-seventh resistor R27, a twenty-ninth resistor R29, an eighth diode D8, a fifth optocoupler U5, a twenty-sixth resistor R26, a twenty-eighth resistor R28 and an eighth capacitor C8;
a first end of a twenty-seventh resistor R27 is connected to a first end of an alternating current power supply, a second end of a twenty-seventh resistor R27 is connected to a first end of a fifth optocoupler U5, a cathode of an eighth diode D8 is connected to a second end of the alternating current power supply, an anode of an eighth diode D8 is connected to a first end of a twenty-ninth resistor R29, a second end of a twenty-ninth resistor R29 is connected to a third end of a fifth optocoupler U5, a second end of the fifth optocoupler U5 is connected to a second end of a twenty-sixth resistor R26 and a first end of a twenty-eighth resistor R28, a fourth end of the fifth optocoupler U5 is grounded, a first end of a twenty-sixth resistor R26 is connected to a low-voltage direct current power supply VDD, a second end of a twenty-eighth resistor R28 is connected to a second input end of the driving
The invention also provides a stirring device which can comprise the series motor control circuit provided by the embodiment of the invention. Wherein, the stirring device comprises but is not limited to stirring products such as a stirrer, a soybean milk machine, a wall breaking machine, an automatic cooking machine and the like.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.