Solid state relay circuit and heating device
阅读说明：本技术 固态继电器电路和加热装置 (Solid state relay circuit and heating device ) 是由 叶庆 于 2019-12-13 设计创作，主要内容包括：本申请涉及一种固态继电器电路和加热装置。固态继电器电路包括光耦合器、可控硅和压敏电阻,光耦合器的发光器连接电路控制端,光耦合器的受光器连接可控硅的控制端,可控硅的第一端与压敏电阻的一端连接,可控硅的第一端连接插座,可控硅的第二端与压敏电阻的另一端连接,可控硅的第二端连接电源输入端。上述固态继电器电路和加热装置,根据电路控制端的信号不同光耦合器的导通状态不同,从而控制可控硅是否导通,当有静电施加到插座的插针上时,利用压敏电阻的吸收浪涌的特性(电压越高,电阻越小),可以将静电释放到与可控硅连接的电源输入端上,减少了对可控硅的冲击,达到保护固态继电器的目的,提高了固态继电器的使用可靠性。(The present application relates to a solid state relay circuit and a heating device. The solid-state relay circuit comprises an optical coupler, a controllable silicon and a piezoresistor, wherein a light emitter of the optical coupler is connected with a control end of the circuit, a light receiver of the optical coupler is connected with a control end of the controllable silicon, a first end of the controllable silicon is connected with one end of the piezoresistor, a first end of the controllable silicon is connected with a socket, a second end of the controllable silicon is connected with the other end of the piezoresistor, and a second end of the controllable silicon is connected with a power input end. Above-mentioned solid-state relay circuit and heating device, the conduction state according to the different optical couplers of signal of circuit control end is different to whether control silicon controlled rectifier switches on, when static is applyed on the contact pin of socket, utilize piezo-resistor's the characteristic of absorption surge (voltage is higher, resistance is less, the less), can release static on the power input end of being connected with the silicon controlled rectifier, reduced the impact to the silicon controlled rectifier, reach the purpose of protection solid-state relay, improved solid-state relay's use reliability.)
1. The utility model provides a solid-state relay circuit, its characterized in that, includes optical coupler, silicon controlled rectifier and piezo-resistor, the illuminator connecting circuit control end of optical coupler, the photic ware of optical coupler is connected the control end of silicon controlled rectifier, the first end of silicon controlled rectifier with piezo-resistor's one end is connected, the socket is connected to the first end of silicon controlled rectifier, the second end of silicon controlled rectifier with piezo-resistor's the other end is connected, the second end connection power input end of silicon controlled rectifier.
2. The circuit of claim 1, further comprising a control circuit, the control circuit being coupled to the circuit control terminal.
3. The circuit as claimed in claim 2, wherein the control circuit comprises a switching tube and a base current-limiting resistor, one end of the base current-limiting resistor is connected to the control end of the switching tube, the other end of the base current-limiting resistor is used for receiving a level signal, the input end of the switching tube is connected to the circuit control end, and the output end of the switching tube is grounded.
4. The circuit of claim 3, wherein the control circuit further comprises a holding resistor, one end of the holding resistor is connected to the control end of the switching tube, and the other end of the holding resistor is connected to the output end of the switching tube.
5. The circuit of claim 4, wherein the base current limiting resistor and the holding resistor have equal resistance values.
6. The circuit of claim 4, wherein the control circuit further comprises an accelerating capacitor connected in parallel with the base current limiting resistor.
7. The circuit of claim 2, further comprising a current limiting component, wherein the input terminal of the control circuit is connected to the circuit control terminal through the current limiting component.
8. The circuit of claim 7, wherein the current limiting component is a resistor.
9. The circuit of claim 1, wherein the thyristor is a triac.
10. A heating device comprising a heater connected to a plug, a plug for connection to a socket, and a solid state relay circuit as claimed in any one of claims 1 to 9, the socket being connected to the solid state relay circuit.
Technical Field
The present application relates to the field of power electronics, and in particular, to a solid-state relay circuit and a heating device.
Background
The solid-state relay is a new type of contactless switch device composed of solid-state electronic components, and it uses the switching characteristics of electronic components, such as switching transistor, silicon controlled rectifier, etc., to achieve the purpose of connecting and disconnecting the circuit without contact and spark, so it is also called contactless switch.
The traditional solid-state relay is usually connected with a socket when in use, when static electricity is generated by friction when a human body touches a contact pin or the socket is connected with a plastic shell, the static electricity of the human body or the static electricity generated by friction can be directly applied to pins of a thyristor in the solid-state relay, the thyristor is damaged, and the phenomenon of soft breakdown is caused.
Disclosure of Invention
In view of the above, it is necessary to provide a solid-state relay circuit and a heating device, which are capable of solving the problem of low reliability of the conventional solid-state relay.
The utility model provides a solid-state relay circuit, includes optical coupler, silicon controlled rectifier and piezo-resistor, the illuminator connecting circuit control end of optical coupler, the photic ware of optical coupler is connected the control end of silicon controlled rectifier, the first end of silicon controlled rectifier with piezo-resistor's one end is connected, the first end connection socket of silicon controlled rectifier, the second end of silicon controlled rectifier with piezo-resistor's the other end is connected, the second end connection power input end of silicon controlled rectifier.
A heating device comprises a heater, a plug, a socket and the solid state relay circuit, wherein the heater is connected with the plug, the plug is used for being connected with the socket, and the socket is connected with the solid state relay circuit.
Above-mentioned solid-state relay circuit and heating device, the illuminator connecting circuit control end of optical coupler, the control end of silicon controlled rectifier is connected to the photic ware, the conduction state of the different optical couplers of signal according to the circuit control end is different, thereby whether control silicon controlled rectifier switches on, the first end of silicon controlled rectifier is connected with piezo-resistor's one end, the socket is connected to the first end of silicon controlled rectifier, the second end of silicon controlled rectifier is connected with piezo-resistor's the other end, the power input end is connected to the second end of silicon controlled rectifier, when static is applyed on the contact pin of socket, the characteristic of the absorption surge of utilizing piezo-resistor (voltage is higher, the resistance is the smaller, can release static on the power input end of being connected with the silicon controlled rectifier, the impact to the silicon controlled rectifier has been reduced, reach protection solid-.
In one embodiment, the control circuit is further included, and the control circuit is connected with the circuit control end.
In one embodiment, the control circuit comprises a switching tube and a base current-limiting resistor, one end of the base current-limiting resistor is connected with the control end of the switching tube, the other end of the base current-limiting resistor is used for accessing a level signal, the input end of the switching tube is connected with the control end of the circuit, and the output end of the switching tube is grounded.
In one embodiment, the control circuit further includes a holding resistor, one end of the holding resistor is connected to the control end of the switching tube, and the other end of the holding resistor is connected to the output end of the switching tube.
In one embodiment, the base current limiting resistor and the maintaining resistor have the same resistance value.
In one embodiment, the control circuit further comprises an accelerating capacitor connected in parallel with the base current limiting resistor.
In one embodiment, the control circuit further comprises a current limiting component, and the input end of the control circuit is connected with the circuit control end through the current limiting component.
In one embodiment, the current limiting component is a resistor.
In one embodiment, the thyristor is a triac.
Drawings
FIG. 1 is a block diagram of a solid state relay circuit in one embodiment;
FIG. 2 is a block diagram of a solid state relay circuit in another embodiment;
fig. 3 is an internal structural view of the solid-state relay in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described more fully below by way of examples in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In an embodiment, please refer to fig. 1, which provides a solid-state relay circuit, including an optical coupler 110, a thyristor 120 and a voltage dependent resistor RV, wherein a light emitter of the optical coupler 110 is connected to a control end of the circuit, a light receiver of the optical coupler 110 is connected to a control end of the thyristor 120, a first end of the thyristor 120 is connected to the voltage dependent resistor RV, a first end of the thyristor 120 is connected to a socket, a second end of the thyristor 120 is connected to the other end of the voltage dependent resistor RV, and a second end of the thyristor 120 is connected to a power input end L. The illuminator of optical coupler 110 is connected with the circuit control end, the control end of silicon controlled rectifier 120 is connected to the photic ware, the conduction state of optical coupler 110 is different according to the signal difference of circuit control end, thereby control whether silicon controlled rectifier 120 switches on, the first end of silicon controlled rectifier 120 is connected with piezo-resistor RV, the first end of silicon controlled rectifier 120 is connected with the socket, the second end of silicon controlled rectifier 120 is connected with the other end of piezo-resistor RV, power input end L is connected to the second end of silicon controlled rectifier 120, when static is exerted on the contact pin of socket, utilize the characteristic of the absorption surge of piezo-resistor RV, namely, the voltage is higher, the resistance is smaller, can release static to the power input end L who is connected with silicon controlled rectifier 120, reduce the impact to silicon controlled rectifier 120, reach the purpose of protection solid state relay IC1, the reliability of use.
Specifically, the optical coupler 110 transmits an electrical signal by using light as a medium, can control the on/off of a circuit, and has a good isolation effect on input and output electrical signals, the optical coupler 110 includes a light emitter and a light receiver, an output end of the light emitter is connected with a circuit control end, an input end of the light emitter is used for connecting voltage, and since the voltage connected to the input end of the light emitter is fixed, the conduction state of the light emitter can be changed according to the level connected to the output end of the light emitter from the circuit control end. In this embodiment, taking the voltage applied to the input terminal of the light emitter as 12V as an example, when the control terminal of the circuit outputs a low level signal, the light emitter is turned on, the optical coupler 110 operates, and the thyristor 120 also operates. The specific types of the light emitter and the light receiver are not unique, the light emitter is an infrared light emitting diode, the light receiver is a photosensitive semiconductor tube, for example, the anode of the infrared light emitting diode is used as an input end for accessing voltage, the cathode of the infrared light emitting diode is used as an output end to be connected with a circuit control end, the photosensitive semiconductor tube is connected with the controllable silicon 120, when the voltage value accessed by the cathode of the infrared light emitting diode can generate voltage drop with the voltage value accessed by the anode, the voltage accessed by the anode is communicated to the cathode of the infrared light emitting diode, so that the infrared light emitting diode emits light, and the photosensitive semiconductor tube generates photocurrent after receiving the light and transmits the photocurrent to the controllable silicon 120 to realize the electro-optic-electrical conversion.
The solid state relay IC1 includes an optical coupler 110 and a thyristor 120, the thyristor 120 has only two states of on and off, when the control end of the thyristor 120 is connected with the current from the optical coupler 110, the thyristor 120 is on, if the output of the thyristor 120 is directly connected with the socket, when the human body touches the pin or the socket plastic shell is connected, the static electricity generated by the friction can be directly applied on the pin of the thyristor 120, causing the damage of the thyristor 120, in this embodiment, the thyristor 120 is connected with the socket and the power input end L through a voltage dependent resistor RV, because the voltage dependent resistor is a high impedance, there is no influence on the circuit, and when the static electricity is applied, because the higher the voltage borne by the voltage dependent resistor RV is, the smaller the resistance is, the characteristic of surge absorption of the voltage dependent resistor RV is utilized, the static electricity is released to the power input end L connected with the thyristor 120, the power input end L is usually provided with an absorption loop which comprises a capacitor, a pressure-sensitive protection device and the like, so that static electricity can be released, the impact on the controllable silicon 120 is reduced, and the purpose of protecting the solid-state relay IC1 is achieved. The specific model of the voltage dependent resistor RV may be determined according to actual requirements, and the model of the solid-state relay IC1 is not unique, and in this embodiment, the model of the solid-state relay IC1 is IC1 AQH3213, and it is understood that in other implementations, the model of the solid-state relay IC1 may be other models as long as those skilled in the art think that the implementation is possible.
In one embodiment, referring to fig. 2, the solid state relay circuit further includes a control circuit 200, and the control circuit 200 is connected to the circuit control terminal. Specifically, the control terminal of the control circuit 200 is used for accessing a level signal, the input terminal of the control circuit 200 is connected to the circuit control terminal, and the output terminal of the control circuit 200 is grounded. The control circuit can be used for controlling the level at the control end of the circuit so as to control the working state of the solid-state relay IC1, the control circuit 200 can be used as a switching circuit to amplify a weak signal into a larger electric signal, and then the level signal accessed by the control end of the control circuit 200 is used for controlling the level signal at the control end of the circuit connected with the input end of the control circuit 200, so that the use is convenient and safe. The structure of the control circuit 200 is not exclusive as long as it can function to control the level signal at the control terminal of the circuit.
In one embodiment, referring to fig. 2, the control circuit 200 includes a switch tube and a base current limiting resistor R1, one end of the base current limiting resistor R1 is connected to the control end of the switch tube, the other end is used for receiving a level signal, the input end of the switch tube is connected to the circuit control end, and the output end of the switch tube is grounded.
Specifically, taking the switching tube as the triode Q1 as an example, one end of the base current limiting resistor R1 is connected to the base of the triode Q1, the other end is used for receiving a level signal, the collector of the triode Q1 is connected to the control end of the circuit, and the emitter of the triode Q1 is grounded. The level signal of the control end of the circuit can be controlled according to the on or off state of the triode Q1, and the base current limiting resistor R1 can protect the triode Q1 and prolong the service life of the triode Q1. One end of a base current limiting resistor R1 is connected with the base of the triode Q1, the other end of the base current limiting resistor R1 is used for accessing a level signal, the collector of the triode Q1 is connected with the control end of the circuit, and the emitter of the triode Q1 is grounded. Taking the type of the triode Q1 as an NPN type triode Q1 as an example, when a level signal accessed by the base current limiting resistor R1 is a low level, the triode Q1 is turned off, a circuit control end connected with a collector of the triode Q1 is in a floating state, the optocoupler 110 does not work, and the thyristor 120 is also in an off state, when a level signal accessed by the base current limiting resistor R1 is a low level, the triode Q1 is turned on, a circuit control end connected with a collector of the triode Q1 is a low level, a light emitter of the optocoupler 110 is turned on, the optocoupler 110 works, the thyristor 120 connected with the optocoupler 110 is also turned on, and the solid state relay IC1 works normally. The base current-limiting resistor R1 connected in series with the base of the triode Q1 is a current-limiting resistor, so that the phenomenon that the base current is excessive and the triode Q1 is damaged due to the fact that the amplitude of the access level signal is too high can be prevented, the effect of protecting the triode Q1 can be achieved, the service life of the triode Q1 is prolonged, and the use reliability of the solid-state relay circuit is improved. It is understood that in other embodiments, the switch tube may be other types of devices as long as the implementation is considered by those skilled in the art.
In one embodiment, referring to fig. 2, the control circuit 200 further includes a holding resistor R2, wherein one end of the holding resistor R2 is connected to the control end of the switch tube, and the other end is connected to the output end of the switch tube.
Specifically, taking the switching transistor as the transistor Q1 and the transistor Q1 as an NPN transistor as an example, one end of the holding resistor R2 is connected to the base of the transistor Q1, and the other end is connected to the emitter of the transistor Q1. Because the maintaining resistor R2 is arranged between the base electrode and the emitter electrode of the triode Q1, when the control end of the triode Q1 does not receive signals, the existence of the maintaining resistor R2 can enable the triode Q1 to keep a cut-off state, current can be controlled better, and the use reliability of the solid-state relay circuit is improved. Further, in one embodiment, the base current limiting resistor R1 and the holding resistor R2 have the same resistance. The resistance values of the base current-limiting resistor R1 and the maintaining resistor R2 are not unique and can be adjusted according to the model of the triode Q1 and actual requirements, in the embodiment, the model of the triode Q1 is 8050, the resistance values of the base current-limiting resistor R1 and the maintaining resistor R2 can be both 2.2k, and the resistors with equal resistance values are used as the base current-limiting resistor R1 and the maintaining resistor R2, so that the stability of the circuit structure is favorably maintained, and the use reliability of the solid-state relay circuit is improved.
In one embodiment, the control circuit 200 further includes an acceleration capacitor connected in parallel with the base current limiting resistor R1. Similarly, taking the type of the transistor Q1 as an NPN type transistor as an example, when a level signal connected to the base of the transistor Q1 through the base current limiting resistor R1 suddenly jumps to suddenly turn on the transistor Q1, the accelerating capacitor is momentarily short-circuited, so that a base current can be quickly supplied to the transistor Q1, and the conduction of the transistor Q1 is accelerated. When the base of the triode Q1 suddenly jumps due to the level signal accessed by the base current limiting resistor R1, the triode Q1 is suddenly turned off, the accelerating capacitor is also instantly turned on, a low-resistance channel is provided for discharging base charges, and the turning-off of the transistor is accelerated. Therefore, the acceleration capacitor can improve the on-off speed of the triode Q1, and the working efficiency of the solid-state relay circuit is improved. Further, the capacitance value of the accelerating capacitor is not unique, and is usually several tens to several hundreds of picofarads, and the capacitance value can be specifically adjusted according to actual requirements, as long as the capacitance value can be realized by those skilled in the art.
In one embodiment, referring to fig. 2, the solid state relay circuit further includes a current limiting component 300, and the input terminal of the control circuit 200 is connected to the circuit control terminal through the current limiting component 300. The current limiting component 300 can limit the current output from the input terminal of the control circuit 200 to the circuit control terminal, and protect the optocoupler 110 connected to the current control terminal. The structure of the current limiting component 300 is not exclusive, and in one embodiment, the current limiting component 300 is a resistor R3, one end of the resistor R3 is connected to the input end of the control circuit 200, and the other end of the resistor R3 is connected to the circuit control end, so that the current excess caused by the excessively high amplitude of the current output from the input end of the control circuit 200 to the circuit control end can be prevented from damaging the optical coupler 110, and the effect of protecting the optical coupler 110 can be achieved, thereby prolonging the service life of the optical coupler 110 and improving the use reliability of the solid-state relay circuit.
In one embodiment, thyristor 120 is a triac. The triac 120 has a bidirectional conduction function, and the on-off state of the triac is determined by the control electrode, in this embodiment, the on-off state of the triac is determined by the conduction state of the optocoupler, and the triac can be conducted in the positive direction by applying a positive pulse to the control electrode, and can be conducted in the reverse direction by applying a negative pulse to the control electrode. The bidirectional thyristor is used as the thyristor 120 of the solid-state relay IC1, has no reverse voltage resistance problem, is suitable for being used as an alternating-current contactless switch, and is reliable to use.
For a better understanding of the above embodiments, the following detailed description is given in conjunction with a specific embodiment. In one embodiment, referring to fig. 2, the solid-state relay circuit includes a solid-state relay IC1, a control circuit 200, a current limiting resistor R3 and a voltage dependent resistor RV, the control circuit 200 includes a resistor R1, a resistor R2 and a transistor Q1, and a signal of the transistor Q1 is 8050.
The solid-state relay IC1 is an integrated circuit that integrates the optocoupler 110 and the thyristor 120, and as shown in fig. 3, a terminal led out from an anode of a light emitter in the optocoupler 110 is used as a
The single chip microcomputer is connected with a triode Q1 through a resistor R1, when the single chip microcomputer does not send a heater working instruction, the optical coupler 110 is not conducted, 8 pins of the solid-state relay IC1 do not output, and when the single chip microcomputer sends the heater working instruction, the optical coupler 110 of the solid-state relay IC1 works, so that the controllable silicon 120 is conducted. When the control signal JRQ _1 is at a low level, the triode Q1 is in a cut-off state, the
Above-mentioned solid-state relay circuit, optical coupler's illuminator connecting circuit control end, the control end of silicon controlled rectifier is connected to the photic ware, the conduction state of the different optical couplers of signal according to the circuit control end is different, thereby whether control silicon controlled rectifier switches on, the first end of silicon controlled rectifier is connected with piezo-resistor's one end, the socket is connected to the first end of silicon controlled rectifier, the second end of silicon controlled rectifier is connected with piezo-resistor's the other end, the power input end is connected to the second end of silicon controlled rectifier, when static is applyed on the contact pin of socket, utilize piezo-resistor's the characteristic of absorption surge (voltage is higher, the resistance is less, can release static on the power input end of being connected with the silicon controlled rectifier, the impact to the silicon controlled rectifier has been reduced, reach the purpose of protection.
In one embodiment, referring to fig. 2, a heating device is provided, which comprises a heater, a plug, a socket and the solid state relay circuit as described above, wherein the heater is connected with the plug, the plug is connected with the socket, and the socket is connected with the solid state relay circuit. Specifically, the heater can be the heater of refrigerator, and when the heater during operation, can melt the inside water evaporation of refrigerator or ice, thereby prevent that the refrigerator from producing the use that the phenomenon influences the refrigerator such as condensation or ice is stifled, solid-state relay circuit passes through plug and socket connection heater, whether accessible solid-state relay IC1 control heater is worked, and it is convenient to use, and solid-state relay circuit uses the reliability height, has also improved heating device's use reliability.
Above-mentioned heating device, the output of the illuminator of optical coupler 110 is connected circuit control end, the input of illuminator is used for the access voltage, silicon controlled rectifier 120 is connected to the photic ware, the conducting state of different optical coupler 110 of signal according to circuit control end is different, thereby control silicon controlled rectifier 120 and switch on, silicon controlled rectifier 120 is parallelly connected with piezo-resistor RV, power input end L is connected to one end after the parallelly connected, socket is connected to the other end after the parallelly connected, when static is applyed on the contact pin of socket, utilize the characteristic of the absorption surge of piezo-resistor RV (voltage is higher, resistance is less, can release static on the power input end L who is connected with silicon controlled rectifier 120, the impact to silicon controlled rectifier 120 has been reduced, reach the purpose of protection solid-state relay IC1, solid-
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
- 上一篇：一种医用注射器针头装配设备
- 下一篇：一种智能语音识别开关面板