阅读说明：本技术 一种直流电机控制电路及方法、家用电器 (Direct current motor control circuit and method and household appliance ) 是由 李一峰 刘子宽 肖龙飞 于 2020-04-20 设计创作，主要内容包括：本发明公开一种直流电机控制电路及方法、家用电器。其中,直流电机控制电路包括电源电路、电机启停控制电路和指示灯电路；电源电路包括第一直流电源和与第一直流电源电连接的电源开关；电机启停控制电路包括电机开关和第二控制开关,电机开关与电源开关串接,第二控制开关电连接在直流电机与地之间,第二控制开关的控制端通过第三限流电阻与电机开关电相连；指示灯电路与电源电路电连接,指示灯电路包括用于在直流电机没有启动发出第一颜色灯光的第一指示灯和用于在直流电机启动时发出第二颜色灯光的第二指示灯。本发明使用简单、容易实现且无需编程的纯硬件电路实现对直流电机及指示灯的同步控制,电路可靠性高。(The invention discloses a direct current motor control circuit and method and a household appliance. The direct current motor control circuit comprises a power supply circuit, a motor start-stop control circuit and an indicator light circuit; the power supply circuit comprises a first direct-current power supply and a power supply switch electrically connected with the first direct-current power supply; the motor start-stop control circuit comprises a motor switch and a second control switch, the motor switch is connected with the power switch in series, the second control switch is electrically connected between the direct current motor and the ground, and the control end of the second control switch is electrically connected with the motor switch through a third current-limiting resistor; the indicating lamp circuit is electrically connected with the power circuit and comprises a first indicating lamp used for emitting light of a first color when the direct current motor is not started and a second indicating lamp used for emitting light of a second color when the direct current motor is started. The invention realizes the synchronous control of the direct current motor and the indicator lamp by using a pure hardware circuit which is simple, easy to realize and free from programming, and has high circuit reliability.)

1. A direct current motor control circuit is characterized by comprising a power supply circuit, a motor start-stop control circuit and an indicator light circuit;

the power supply circuit comprises a first direct-current power supply and a power supply switch electrically connected with the first direct-current power supply;

the motor start-stop control circuit comprises a motor switch and a second control switch, the motor switch is connected with the power switch in series, the second control switch is electrically connected between the direct current motor and the ground, and the control end of the second control switch is electrically connected with the motor switch through a third current-limiting resistor;

the indicating lamp circuit is electrically connected with the power circuit and comprises a first indicating lamp used for emitting light of a first color when the direct current motor is not started and a second indicating lamp used for emitting light of a second color when the direct current motor is started.

2. The dc motor control circuit of claim 1, wherein the second control switch is a second transistor, a base of the second transistor is electrically connected to the motor switch through a third current limiting resistor, an emitter of the second transistor is grounded, and a collector of the second transistor is electrically connected to the dc motor.

3. The dc motor control circuit of claim 2, wherein the second transistor is an N-type transistor.

4. The dc motor control circuit of claim 1, wherein one end of the second indicator light is grounded and the other end is electrically connected to a common terminal of the motor switch and the third current limiting resistor through a fourth current limiting resistor.

5. The dc motor control circuit according to claim 1, wherein the dc motor is electrically connected to a second dc power source, and a first diode is connected in parallel to both ends of the dc motor, and a cathode of the first diode is electrically connected to the second dc power source.

6. A DC motor control circuit according to any of claims 1 to 5 in which the first indicator light is connected at one end to earth and at the other end electrically connected to the common terminal of the power switch and the motor switch, and a first control switch is provided connected in parallel with the first indicator light, the control terminal of the first control switch being electrically connected to the common terminal of the motor switch and the third current limiting resistor via a second current limiting resistor.

7. The dc motor control circuit of claim 6, wherein the first control switch is a first transistor, the first indicator light has two ends electrically connected to a collector and an emitter of the first transistor, respectively, the emitter of the first transistor is grounded and the base is electrically connected to the motor switch through a second current limiting resistor.

8. The dc motor control circuit of claim 6, wherein the common terminal of the first indicator light and the first control switch is electrically connected to the common terminal of the power switch and the motor switch through a first current limiting resistor.

9. The method for controlling a direct current motor control circuit according to any one of claims 1 to 8, comprising:

when the power switch is switched on and the motor switch is not switched on, the second control switch keeps a cut-off state to enable the direct current motor not to be started, the first control switch keeps cut-off to enable the first direct current power supply to supply power to the first indicator lamp, and the first indicator lamp emits first color light to indicate that the direct current motor is in a first working state without being started;

when the power switch and the motor switch are switched on simultaneously, the first control switch is switched to a conducting state to short circuit the first indicator lamp, the second control switch is switched to the conducting state to enable the second direct-current power supply to supply power to the direct-current motor to be started, and the first direct-current power supply supplies power to the second indicator lamp through the motor switch to enable the second indicator lamp to emit second color light to indicate that the motor is in a started second working state.

10. An electric household appliance comprising a dc motor and a work producing component driven by the dc motor, characterized by comprising a dc motor control circuit according to any one of claims 1 to 8.

Technical Field

The present invention relates to a motor control circuit, and more particularly, to a dc motor control circuit and a household appliance having the same.

Background

This section merely provides background information related to the present application so as to enable those skilled in the art to more fully and accurately understand the present application, which is not necessarily prior art.

In the household appliances such as a chopper, a dough mixer and the like, a direct current motor is usually used as a power source to drive a knife group to realize actions such as chopping, dough mixing and the like, in the existing direct current motor control circuit, a singlechip is used to trigger a second triode Q2 to drive a direct current motor to work, and a singlechip I/O interface is externally connected with a light emitting diode indicator lamp, as shown in fig. 1, wherein, IC represents a singlechip, after a power switch K1 is pressed, a pin 7 of the singlechip is grounded through a current limiting resistor R1, at the moment, a 2 nd pin output signal of the singlechip is transmitted to a light emitting diode L ED1 (for example, the light emitting diode L ED1 is a red ED2 ED and emits a red lamp when the light emitting diode is lighted), so that L ED1 lights up, when the power switch K1 is in a switching-on state, a motor switch K2 is pressed, a pin 6 th pin detection of the current limiting resistor R2 is grounded, at the 1 st pin output signal is provided to the light emitting diode L through a current limiting resistor R4 (for example, a collector of the light emitting diode ED L is provided to an emitter of the current limiting resistor M L, and a collector L is provided to the second triode Q L, so that the current limiting resistor M L and the current emitter L starts to turn-on emitter L, the current of the current limiting transistor Q L, the current limiting resistor D L, the current limiting transistor Q L, the current emitter L is provided to turn-off, the second triode Q L, the emitter 36.

However, the prior art has the following disadvantages: because a single chip microcomputer or other controllers are used as core elements for controlling the work of the direct current motor, the single chip microcomputer is high in cost, and can work normally only by programming, so that the realization is difficult, and the single chip microcomputer is easy to be broken down or even damaged by external factors (such as static electricity).

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a direct current motor control circuit and a household appliance with the same, wherein the control circuit is realized by a pure hardware circuit with a simple circuit structure, and has low realization cost and high reliability.

The invention provides a direct current motor control circuit, which comprises a power supply circuit, a motor start-stop control circuit and an indicator light circuit; the power supply circuit comprises a first direct-current power supply and a power supply switch electrically connected with the first direct-current power supply; the motor start-stop control circuit comprises a motor switch and a second control switch, the motor switch is connected with the power switch in series, the second control switch is electrically connected between the direct current motor and the ground, and the control end of the second control switch is electrically connected with the motor switch through a third current-limiting resistor; the indicating lamp circuit is electrically connected with the power circuit and comprises a first indicating lamp used for emitting light of a first color when the direct current motor is not started and a second indicating lamp used for emitting light of a second color when the direct current motor is started.

In one embodiment, the second control switch is a second triode, the base of the second triode is electrically connected with the motor switch through a third current-limiting resistor, the emitter of the second triode is grounded, and the collector of the second triode is electrically connected with the direct current motor.

In one embodiment, the second transistor is an N-type transistor.

In one embodiment, one end of the second indicator light is grounded, and the other end of the second indicator light is electrically connected with the common end of the motor switch and the third current limiting resistor through the fourth current limiting resistor.

In one embodiment, the dc motor is electrically connected to a second dc power source, and a first diode is further coupled in parallel to both ends of the dc motor, and a cathode of the first diode is electrically connected to the second dc power source.

In one embodiment, one end of the first indicator light is grounded, the other end of the first indicator light is electrically connected to the common end of the power switch and the motor switch, a first control switch is arranged to be connected with the first indicator light in parallel, and the control end of the first control switch is electrically connected with the common end of the motor switch and the third current limiting resistor through a second current limiting resistor.

In one embodiment, the first control switch is a first triode, two ends of the first indicator light are respectively electrically connected with a collector electrode and an emitter electrode of the first triode, the emitter electrode of the first triode is grounded, and a base electrode of the first triode is electrically connected with the motor switch through a second current limiting resistor.

In one embodiment, the first indicator light and the common terminal of the first control switch are electrically connected with the common terminal of the power switch and the motor switch through a first current limiting resistor.

The invention discloses a control method of a direct current motor control circuit, which comprises the following steps: when the power switch is switched on and the motor switch is not switched on, the second control switch keeps a cut-off state to enable the direct current motor not to be started, the first control switch keeps cut-off to enable the first direct current power supply to supply power to the first indicator lamp, and the first indicator lamp emits first color light to indicate that the direct current motor is in a first working state without being started; when the power switch and the motor switch are switched on simultaneously, the first control switch is switched to a conducting state to short circuit the first indicator lamp, the second control switch is switched to the conducting state to enable the second direct-current power supply to supply power to the direct-current motor to be started, and the first direct-current power supply supplies power to the second indicator lamp through the motor switch to enable the second indicator lamp to emit second color light to indicate that the motor is in a started second working state.

The invention also discloses a household appliance which comprises the direct current motor, the acting component driven by the direct current motor and the direct current motor control circuit.

Compared with the prior art, the invention has the following beneficial effects:

the invention simultaneously controls the start and stop of the direct current motor M1 through the second control switch, controls the first indicator light L ED1 through the first control switch according to the start and stop state of the direct current motor M1, enables the first indicator light L ED1 to be turned off by short circuit when the direct current motor M1 is started, enables the first indicator light L ED1 not to be turned on by short circuit when the direct current motor M1 is not started, and is matched with the second indicator light L ED2 controlled by the motor switch, the first indicator light L ED1 emits first color light to indicate that the direct current motor M1 is in a first working state which is not started, and the second indicator light L ED2 emits second color light to indicate that the motor M2 is in a second working state which is started.

Drawings

Fig. 1 is a circuit schematic diagram of a dc motor control circuit in the prior art.

Fig. 2 is a circuit schematic diagram of a dc motor control circuit disclosed in the present invention.

Fig. 3 is an equivalent circuit diagram corresponding to fig. 2 when the power switch K1 and the motor switch K2 are simultaneously pressed.

Detailed Description

To further clarify the technical solutions and effects adopted by the present application to achieve the intended purpose, the following detailed description is given with reference to the accompanying drawings and preferred embodiments according to the present application. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The invention provides a direct current motor control circuit, which realizes the control of starting and stopping a direct current motor without using control of a single chip microcomputer and the like, and indicates the starting and stopping working state of the direct current motor by controlling an indicator lamp to emit light.

As shown in fig. 2, the dc motor control circuit includes a power circuit, a motor start/stop control circuit and an indicator light circuit, the power circuit includes a first dc power source VCC1 and a power switch K1 electrically connected to the first dc power source VCC1, the motor start/stop control circuit includes a motor switch K2 and a second control switch, the motor switch K2 is connected in series with the power switch K1, the second control switch is electrically connected between the dc motor M1 and the ground, a control end of the second control switch is electrically connected to the motor switch K2 through a third current limiting resistor R3, the indicator light circuit includes a first indicator light L ED1 and a second indicator light L2, in an on state of the power switch K1, if the motor switch K2 is not turned on, the dc motor M1 cannot be started, and the first indicator light L ED1 emits a first color light to indicate that the dc motor M1 is in a first off state, and if the motor switch K2 is not turned on, the dc switch M L ED 5956 emits a second color light to indicate that the motor M8653 is turned on, the second indicator light 828653.

One end of the first indicator light L ED1 is grounded, the other end of the first indicator light L ED1 is electrically connected to the common end of the power switch K1 and the motor switch K2, a first control switch is arranged to be connected with the first indicator light L ED1 in parallel, and the control end of the first control switch is electrically connected with the common end of the motor switch K2 and the third current-limiting resistor through a second current-limiting resistor R2.

The first control switch preferably uses a first transistor Q1., the first transistor Q1 is an N-type transistor, the two ends of the first indicator light L ED1 are electrically connected with the collector and emitter of the first transistor Q1, respectively, the emitter of the first transistor Q1 is grounded, and the base is electrically connected with the motor switch K2 through a second current-limiting resistor R2. in the on state of the power switch K1, the first transistor Q1 is in the off state when the motor switch K2 is not turned on, so that the first DC power source VCC1 can supply power to the first indicator light L ED1 to emit light of the first color, and when the motor switch K2 is turned on, the first transistor Q1 is switched from the off state to the on state, so that the first indicator light L ED1 is short-circuited by the first control switch, and the first indicator light L ED1 is extinguished.

In addition, the common end of the first indicator light L ED1 and the first control switch is electrically connected with the common end of the power switch K1 and the motor switch K2 through a first current limiting resistor R1, and the first current limiting resistor R1 protects the first indicator light L ED1 from overcurrent damage so as to improve the working reliability.

One end of the second indicator light L ED2 is grounded and the other end is electrically connected with the common end of the motor switch K2 and the third current limiting resistor, and in order to protect the second indicator light L ED2 from overcurrent damage, one end of the second indicator light L ED2 is electrically connected with the motor switch K2 through the fourth current limiting resistor R4.

The dc motor M1 is electrically connected to a second dc power VCC 2. In addition, a first diode D1 is connected in parallel to both ends of the dc motor M1, and a cathode of the first diode D1 is electrically connected to a second dc power source VCC 2. The first diode D1 functions to prevent the reverse self-induced electromotive force generated at the moment when the dc motor M1 stops from interfering with the entire circuit, and provides a voltage bleeding path for the self-induced electromotive force through the first diode D1.

The second control switch preferably uses a second transistor Q2. The second transistor Q2 is an N-type transistor. The base of the second triode Q2 is electrically connected with the motor switch K2 through the third current limiting resistor R3, the emitter of the second triode Q2 is grounded, and the collector of the second triode Q2 is electrically connected with the dc motor M1.

For example, the first indicator light L ED1 is a L ED lamp bead emitting red light, the first operating state of the dc motor M1 is a state in which the dc motor M1 is not started and is stopped, the second indicator light L ED2 is an L ED lamp bead emitting green light, and the second operating state of the dc motor M1 is a state in which the dc motor M1 is started and is in operation.

The working principle of the dc motor control circuit disclosed by the invention is further explained as follows:

(1) when the power switch K1 is turned on but the motor switch K2 is still in an off state, at this time, the base of the first triode Q1 and the base of the second triode Q2 are both powered on and at a low level and thus both are kept in an off state, so that at this time, the second dc power supply VCC2 cannot form a path with the ground through the dc motor M1, and thus the dc motor M1 is in a first working state of not being started, and at the same time, the first dc power supply VCC1 supplies power to the first indicator lamp L ED1 through the power switch K1 and the first current-limiting resistor R1, so that the first indicator lamp L ED1 emits a first color light to indicate that the dc motor M1 is in the first working state.

(2) When the power switch K1 is turned on, the motor switch K2 is pressed to make the motor switch K2 in an on state, and an equivalent circuit diagram of the control circuit is shown in fig. 3. after passing through the power switch K1 and the motor switch K2, the first direct current power supply VCC1 supplies power to the second current-limiting resistor R2, the third current-limiting resistor R3 and the fourth current-limiting resistor R4, respectively, on one hand, the second indicator light L ED L is powered to emit light of the second color, on the other hand, the base of the second triode Q L is at a high level due to the third current-limiting resistor R L being powered to turn on the second triode Q L, on the other hand, the base of the first triode Q L is at a high level due to the second current-limiting resistor R L being powered to turn on the first triode Q L, after the first triode Q L is powered to turn on the first triode Q L, both ends of the first indicator light L ED L are short-circuited, so that the first indicator light L ED L is in an off state, when both the power switch K and the motor switch K L is powered to turn off the motor light, the motor switch K L is turned on, the motor L indicates that the motor is turned on the motor light is turned on the motor L.

The invention provides a control indication method of a direct current motor, which comprises the steps that when a power switch K1 is switched on and a motor switch K2 is not switched on, a second control switch keeps an off state to enable a direct current motor M1 not to be started, a first control switch keeps off to enable a first direct current power supply VCC1 to supply power to a first indicator lamp L ED1, the first indicator lamp L ED 23 emits light with a first color to indicate that a direct current motor M1 is in a first non-starting working state, when the power switch K1 and the motor switch K2 are switched on simultaneously, the first control switch is switched to a conducting state to enable the first indicator lamp L ED1 to be short-circuited, the second control switch is switched to a conducting state to enable a second direct current power supply VCC2 to supply power to the direct current motor M84 to be started, and the first direct current power supply 1 supplies power to a second indicator lamp L ED2 through the motor switch K2 to enable the second indicator lamp 2 to emit light with a second color to indicate that the motor M2 is in a second VCC 57324 working state.

The invention also discloses a household appliance which comprises a direct current motor M1, a work doing component driven by the direct current motor M1 and the control circuit, wherein the control circuit controls the working state of the direct current motor M1 and correspondingly emits lights with different colors through a first indicator light L ED1 and a second indicator light L ED2 to indicate the working state of the direct current motor M1.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.