WO2020191914A1

WO2020191914A1 - Drive control circuit and home appliance

Info

Publication number: WO2020191914A1
Application number: PCT/CN2019/088289
Authority: WO
Inventors: 邱禹; 文先仕; 曾贤杰; 黄招彬
Original assignee: 广东美的制冷设备有限公司
Priority date: 2019-03-22
Filing date: 2019-05-24
Publication date: 2020-10-01
Also published as: CN109743051A; JP7469324B2; JP2022528322A

Abstract

The present application provides a drive control circuit and a home appliance. The drive control circuit comprises: a self-holding relay, a movable contact of the self-holding relay being connected to a power grid system, and being able to control the power grid system to supply power to a load; and a bridge circuit, the bridge circuit being configured to output a pulse signal to a control end of the self-holding relay, the pulse signal being a high-level pulse signal or a low-level pulse signal, wherein a first control end of the self-holding relay receives the high-level pulse signal, and at the same time, a second control end of the self-holding relay receives the low-level pulse signal, the movable contact of the self-holding relay performs action switching, and maintains the state after last action switching before receiving the next pulse signal, the action switching is to switch from closing to opening or from opening to closing. The technical solution of the present application reduces the power consumption of the drive control circuit, and also reduces the risk of damage caused by electric leakage or temperature rise of a device, thereby prolonging the service life.

Description

Drive control circuit and home appliances

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, application number 201910224249.3, and the title of the invention "Drive Control Circuit and Home Appliances" on March 22, 2019, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of circuit technology, and in particular to a drive control circuit and a household appliance.

Background technique

As a kind of control element, relay is widely used in drive control circuit, playing the role of automatic adjustment, safety protection, conversion circuit, etc.

For example, in the drive control circuit of the outdoor unit of the inverter air conditioning system, in order to avoid the input of excessive AC current when the power is turned on, the traditional relay is often used to limit the charging current, that is, the drive is changed by controlling the relay to be energized or de-energized. Control the power supply status of the circuit.

In the related art, the traditional relay is in the closed state when the control circuit is working, that is, it needs to be continuously energized, which has at least the following technical problems:

(1) Since the power supply state of the drive control circuit needs to be continuously energized, the power consumption of the drive control circuit will be increased.

(2) Since the load on the relay is usually an AC signal with a frequency of 50Hz and an effective value of 220V, there is a risk of leakage when the relay is continuously energized.

(3) If the relay is frequently energized and de-energized, it will cause interference pulses such as surge signals and ripple signals in the drive control circuit, which will cause some components in the drive control circuit to rise sharply, or even Burned out will not only affect the reliability of local devices, but also increase the thermal crosstalk in the drive control circuit.

Summary of the invention

This application aims to solve at least one of the technical problems existing in the aforementioned prior art or related technologies.

For this reason, one purpose of this application is to provide a drive control circuit.

Another purpose of this application is to propose a household appliance.

In order to achieve the above objective, according to the embodiments of the first aspect of the present application, a drive control circuit is proposed, including: a self-holding relay. The moving contact of the self-holding relay is connected to the grid system and can control the grid system to load Power supply; bridge circuit, the bridge circuit is configured to output a pulse signal to the control terminal of the self-holding relay, the pulse signal is a high-level pulse signal or a low-level pulse signal, wherein the first control terminal of the self-holding relay receives High-level pulse signal. At the same time, the second control terminal of the self-holding relay receives a low-level pulse signal, and the moving contact of the self-holding relay performs action switching, and maintains the last action after switching before receiving the next pulse signal State, the action is switched from closed to open, or from open to closed.

According to the drive control circuit of the embodiment of the present application, by setting a self-holding relay in the drive control circuit, since the self-holding relay is a mechanical relay, it can be self-retained through a mechanical structure after being energized, without the need for continuous energization. In the working state, the energy consumption is greatly reduced. The longer the working time, the lower the average energy consumption. At the same time, the risk of damage caused by leakage and device heating is reduced, thereby prolonging each of the above-mentioned drive control circuits. The service life of components.

In addition, the use of a bridge circuit to output a pulse signal to the control terminal of the self-holding relay is not only beneficial to further reduce the power consumption of the drive control circuit, but also beneficial to improve the reliability of the self-holding relay entering the conducting state or the closed state.

Specifically, the bridge circuit in the traditional sense usually contains resistance, capacitance or inductance. As the requirements for the reliability and power consumption of the bridge circuit are getting higher and higher, therefore, switching elements with low power consumption are connected to In the bridge arms of the bridge circuit, it is not only conducive to reducing power consumption and improving reliability, but also conducive to further shortening the response time of the bridge circuit. Moreover, after a large number of experimental verifications, all types of bridge circuits can meet the requirements of this application. Application requirements.

According to the drive control circuit of the above-mentioned embodiment of the present application, preferably, four bridge arms are provided in the bridge circuit, and any bridge arm is provided with a switch unit. If the switch unit is turned on, the corresponding bridge arm is turned on. When the switch unit is turned off, the corresponding bridge arm is turned off.

According to the drive control circuit of the embodiment of the present application, by providing a switch unit in each bridge arm of the bridge circuit, not only the power consumption of the switch unit is lower, but the bridge circuit outputs a high-level pulse signal with higher reliability. And the low-level pulse signal, thereby improving the reliability of the bridge circuit to control the self-holding relay.

According to the drive control circuit of the above embodiment of the present application, preferably, the four bridge arms are the first bridge arm, the second bridge arm, the third bridge arm, and the fourth bridge arm that are connected in sequence, and the first bridge arm and the second bridge arm The common end between the arms is connected to the first control end of the self-holding relay, the common end between the third bridge arm and the fourth bridge arm is connected to the second control end of the self-holding relay, the first bridge arm and the fourth bridge The common end between the arms is connected to the DC source, and the common end between the second bridge arm and the third bridge arm is connected to the ground. Among them, if the first bridge arm is turned on and the second bridge arm is turned off at the same time, the first A control terminal receives a high-level pulse signal. If the first bridge arm is turned off and the second bridge arm is turned on, the first control terminal receives a low-level pulse signal. If the fourth bridge arm is turned on, at the same time, When the third bridge arm is turned off, the second control terminal receives a high-level pulse signal. If the fourth bridge arm is turned off and the third bridge arm is turned on, the second control terminal receives a low-level pulse signal.

According to the drive control circuit of the embodiment of the present application, the four bridge arms are set as the first bridge arm, the second bridge arm, the third bridge arm, and the fourth bridge arm that are sequentially connected, and the bridge circuit is connected to The self-holding relay is connected, wherein the common end between the first bridge arm and the second bridge arm is connected to the first control end, and the common end between the third bridge arm and the fourth bridge arm is connected to the second control end, That is, by controlling the cut-off or conduction of the four bridge arms to adjust the action switching of the self-holding relay, not only can reduce power consumption, but also can shorten the action delay of controlling the self-holding relay, and further improve the reliability of overcurrent protection of the load. Sexuality and timeliness.

Further, if the conduction states of two opposite bridge arms among the four bridge arms are the same (both on or both off), and the conduction states of the two adjacent bridge arms are opposite (if one bridge arm is on, then The other bridge arm is cut off), the two control terminals of the self-holding relay can receive the high-level pulse signal and the low-level pulse signal respectively, that is, the action can be switched.

According to the drive control circuit of the above-mentioned embodiment of the present application, preferably, further includes: a first current-limiting resistor, connected in series between the bridge circuit and the DC source, and/or between the bridge circuit and the ground, and The current limiting resistor is configured to limit the current protection of the bridge circuit.

According to the drive control circuit of the embodiment of the present application, the current limiting protection of the bridge circuit is performed by setting the first current limiting resistor. On the one hand, it is beneficial to reduce the impact of the overcurrent signal in the power grid system on the bridge circuit. On the other hand, When any bridge arm in the bridge circuit has a short-circuit fault, the impact of the short-circuit current on the switch unit can be reduced.

For example, if the first bridge arm and the second bridge arm are turned on at the same time, and there is no current-limiting resistor in series with the above two bridge arms, the potential difference between the DC source and the ground will be sufficient to break down the first bridge arm. The switch unit and the switch unit in the second bridge arm will not only cause the failure of the bridge circuit, but also cause the self-holding relay to fail, which in turn causes the self-holding relay to lose the role of AC overcurrent protection for the load.

Among them, the voltage of the DC source is usually 5V, 12V, or 24V, but it is not limited to this. The value of the first current-limiting resistor ranges from 0.1 ohm to 30 ohms (including endpoints), but it is not limited to this. A current limiting resistor can make the current flowing through the bridge circuit smaller than the overcurrent current of the switching element.

According to the drive control circuit of the above-mentioned embodiment of the present application, preferably, if one of the switch unit in the first bridge arm and the switch unit in the second bridge arm is a P-type switch tube, then the switch unit in the first bridge arm The other switch unit in the switch unit and the switch unit in the second bridge arm is an N-type switch tube. If one of the switch units in the third bridge arm and the switch unit in the fourth bridge arm is a P-type switch Tube, the other of the switching unit in the third bridge arm and the switching unit in the fourth bridge arm is an N-type switching tube.

According to the drive control circuit of the embodiment of the present application, the first bridge arm and the second bridge arm are set as inverted switch tubes, and the third bridge arm and the fourth bridge arm are set as inverted switch tubes. First, the switch tube has Significant advantages such as low on-voltage, low power consumption and low time delay improve the reliability and timeliness of the control of the self-holding relay by the bridge circuit, and further reduce the power consumption of the drive control circuit.

Preferably, one control port can be used to simultaneously output control signals to the first bridge arm and the second bridge arm. Since the two bridge arms are set as inverted switches, for example, if the control signal is high, the first bridge arm Only one bridge arm of the second bridge arm is turned on, while the other bridge arm is turned off. Similarly, a control port can be used to output control signals to the third bridge arm and the fourth bridge arm at the same time, which not only simplifies the circuit design complexity It also effectively reduces the possibility that the first bridge arm and the second bridge arm are directly connected, and the third bridge arm and the fourth bridge arm are directly connected.

According to the drive control circuit of the foregoing embodiment of the present application, preferably, the switch unit includes at least one of the following: a metal oxide semiconductor tube, an insulated gate bipolar transistor, and a triode.

According to the drive control circuit of the embodiment of the present application, the metal oxide semiconductor tube refers to Metal-Oxide-Semiconductor Field Effect Transistor, referred to as MOSFET for short, and insulated gate bipolar transistor refers to Insulated Gate Bipolar Translator, referred to as IGBT, including metal oxide The switching tubes including semiconductor tubes, insulated gate bipolar transistors and triodes are all high-speed and low-power switching tubes.

Preferably, since the leakage current of the MOSFET (usually including the enhancement type and the depletion type) is smaller and the reliability is higher, one embodiment is to select the P-type MOSFET as the switch tube of the first leg. The switching tube of the bridge arm is an N-type MOSFET, the switching tube of the fourth bridge arm is a P-type MOSFET, and the switching tube of the third bridge arm is an N-type MOSFET.

Among them, for the N-type MOSFET, when V _gs ≥ V _t , the channel is formed. At this time, the forward voltage V _ds is added between the drain and the source to generate the drain current, where V _gs is The gate-source voltage, V _t is the turn-on voltage, and V _ds is the source-drain voltage.

Similarly, for P-type MOSFETs, when V _gs ≤ V _t , the channel is formed. At this time, a negative voltage V _{ds is} added between the drain and the source to generate a drain current. Among them, V _gs Is the gate-source voltage, V _t is the turn-on voltage, and V _ds is the source-drain voltage.

According to the drive control circuit of the above-mentioned embodiment of the present application, preferably, it further includes: a second current-limiting resistor, which is arranged on at least one of the gate, source and drain of the metal oxide semiconductor tube, and/or arranged on At least one of the base, emitter, and collector of the insulated gate bipolar transistor, and/or at least one of the base, emitter, and collector of the triode, used for current limiting protection of the switching unit .

According to the drive control circuit of the embodiment of the present application, by connecting the second current-limiting resistor to the switch tube of any bridge arm in the above-mentioned manner, the possibility of bridge arm breakdown can be effectively reduced, and in addition, it is further improved The reliability and timeliness of the trigger control of the self-holding relay by the bridge circuit is improved.

In addition, from the perspective of further reducing the power consumption of the drive control circuit, the value range of the second current limiting resistor is 0.1 ohm to 30 ohm (including the end point), but is not limited to this.

According to the drive control circuit of the above-mentioned embodiment of the present application, preferably, it further includes: a first drive device, the first drive device is provided with a first drive signal output end, the drive end of the first bridge arm and the drive of the second bridge arm Terminal is connected to the first drive signal output terminal; wherein the first drive signal output terminal outputs a high-level drive signal to the drive terminal of the first bridge arm and the drive terminal of the second bridge arm, or the first drive signal output terminal to the first The driving end of one bridge arm and the driving end of the second bridge arm output low-level driving signals.

According to the drive control circuit of the embodiment of the present application, the first drive signal output terminal is used as a control port to simultaneously drive the first bridge arm and the second bridge arm, that is, by providing a first drive device. In the above-mentioned embodiment, The first bridge arm and the second bridge arm include inverted switch tubes, so that the first control terminal can receive a high-level pulse signal or a low-level pulse signal.

For example, the switching tube of the first bridge arm is a P-type MOSFET, the switching tube of the second bridge arm is an N-type MOSFET, and the drain of the P-type MOSFET of the first bridge arm is connected to the DC source, and the source of the P-type MOSFET is connected To the drain of the N-type MOSFET of the second leg, the source of the N-type MOSFET of the second leg is grounded, if the first drive signal output terminal is to the P-type MOSFET of the first leg and the N-type MOSFET of the second leg Type MOSFET outputs a high-level drive signal, the first bridge arm is cut off, the second bridge arm is turned on, and the first control terminal of the self-holding relay receives a low-level pulse signal. Similarly, if the first drive signal output terminal is The P-type MOSFET of the first bridge arm and the N-type MOSFET of the second bridge arm output low-level drive signals, and the first control terminal of the self-holding relay receives a high-level pulse signal.

According to the drive control circuit of the above embodiment of the present application, preferably, it further includes: the first drive device includes at least one of the following: a metal oxide semiconductor tube, an insulated gate bipolar transistor, and a triode.

According to the drive control circuit of the embodiment of the present application, by setting the first drive device as the above-mentioned switch tube, it is beneficial to further reduce the power consumption and response delay of the drive control circuit, and it is also beneficial to improve the reliability of the circuit.

Preferably, the first driving device is selected as an insulated gate bipolar transistor.

According to the drive control circuit of the above-mentioned embodiment of the present application, preferably, it further includes: a third current-limiting resistor, arranged on at least one of the gate, source and drain of the metal oxide semiconductor tube, and/or arranged on At least one of the base, emitter, and collector of the insulated gate bipolar transistor, and/or at least one of the base, emitter, and collector of the transistor, is used to limit the first driving device. Stream protection.

According to the drive control circuit of the embodiment of the present application, by arranging the third current-limiting resistor at the three ends of the first drive device, the possibility of the first drive device being interfered or broken down by the overcurrent signal can be effectively reduced, thereby further improving The reliability of the bridge circuit to the self-holding relay control is improved.

In addition, from the perspective of further reducing the power consumption of the drive control circuit, the value range of the third current-limiting resistor is 0.1 ohm to 30 ohm (including the end point), but is not limited to this.

According to the drive control circuit of the above embodiment of the present application, preferably, it further includes: a second drive device, the second drive device is provided with a second drive signal output terminal, the drive terminal of the third bridge arm and the drive of the fourth bridge arm Terminal is connected to the second drive signal output terminal; wherein, the second drive signal output terminal outputs a high-level drive signal to the drive terminal of the third bridge arm and the drive terminal of the fourth bridge arm, or the second drive signal output terminal to the first The driving end of the third bridge arm and the driving end of the fourth bridge arm output low-level driving signals.

According to the drive control circuit of the embodiment of the present application, the second drive signal output terminal is used as a control port to simultaneously drive the third bridge arm and the fourth bridge arm, that is, by providing a second drive device, in the above-mentioned embodiment, The third bridge arm and the fourth bridge arm include inverted switch tubes, so that the second control terminal can receive a high-level pulse signal or a low-level pulse signal.

For example, the switching tube of the fourth bridge arm is a P-type MOSFET, the switching tube of the third bridge arm is an N-type MOSFET, and the drain of the P-type MOSFET of the fourth bridge arm is connected to the DC source, and the source of the P-type MOSFET is connected To the drain of the N-type MOSFET of the third leg, the source of the N-type MOSFET of the third leg is grounded, if the second drive signal output ends to the P-type MOSFET of the fourth leg and the N of the third leg Type MOSFET outputs a high-level drive signal, the fourth bridge arm is cut off, the third bridge arm is turned on, and the second control end of the self-holding relay receives a low-level pulse signal. Similarly, if the second drive signal output end is The P-type MOSFET of the fourth bridge arm and the N-type MOSFET of the third bridge arm output low-level drive signals, and the second control terminal of the self-holding relay receives a high-level pulse signal.

According to the drive control circuit of the above embodiment of the present application, preferably, it further includes: the second drive device includes at least one of the following: a metal oxide semiconductor tube, an insulated gate bipolar transistor, and a triode.

According to the drive control circuit of the embodiment of the present application, by setting the second drive device as the above-mentioned switch tube, it is beneficial to further reduce the power consumption and response delay of the drive control circuit, and it is also beneficial to improve the reliability of the circuit.

Preferably, the second driving device is selected as an insulated gate bipolar transistor.

According to the drive control circuit of the above-mentioned embodiment of the present application, preferably, it further comprises: a fourth current-limiting resistor, which is arranged on at least one of the gate, source and drain of the metal oxide semiconductor tube, and/or arranged on At least one of the base, emitter, and collector of the insulated gate bipolar transistor, and/or at least one of the base, emitter, and collector of the transistor, is used to limit the second driving device. Stream protection.

According to the drive control circuit of the embodiment of the present application, by arranging the fourth current limiting resistor at the three ends of the second drive device, the possibility of the second drive device being interfered or broken down by the overcurrent signal can be effectively reduced, and the possibility of further improvement The reliability of the bridge circuit to the self-holding relay control is improved.

In addition, from the perspective of further reducing the power consumption of the drive control circuit, the value range of the fourth current limiting resistor is 0.1 ohm to 30 ohm (including the end point), but is not limited to this.

According to the drive control circuit of the above embodiment of the present application, preferably, it further includes: a positive temperature coefficient temperature-sensitive resistor, the positive temperature coefficient temperature-sensitive resistor is connected in parallel with the self-holding relay, and the positive temperature coefficient temperature-sensitive resistor is configured to input to the grid system The electric energy is subjected to current limiting treatment. When the moving contact of the self-holding relay is in the disconnected state, the electrical energy input from the grid system supplies power to the load through the temperature-sensitive resistor of the positive temperature system, or the moving contact of the self-holding relay is in the conducting state , The electric energy input from the grid system supplies power to the load through the moving contact of the self-holding relay.

According to the drive control circuit of the embodiment of the present application, the positive temperature coefficient usually refers to Positive Temperature Coefficient. Therefore, the positive temperature coefficient temperature-sensitive resistor is usually referred to as PTC for short. That is, if the moving contact of the self-holding relay is in the disconnected state, the power grid The electrical energy input by the system is supplied to the load through the PTC. If the electrical energy is too large, the temperature of the PTC will rise sharply, which will cause the resistance of the PTC to increase to block the overcurrent signal. If the moving contact of the self-holding relay is in the conducting state , The electrical energy input from the grid system supplies power to the load through the moving contact of the self-holding relay, and the power consumption of the electrical energy through the moving contact of the self-holding relay is very low, which is beneficial to improve the energy efficiency of power supply.

According to the above-mentioned embodiment of the present application, the drive control circuit preferably further includes: a rectifier element connected between the self-holding relay and the load, the rectifier element is configured to convert the AC signal output by the power grid system into a DC signal. The signal is configured to supply power to the load.

According to the drive control circuit of the embodiment of the present application, the rectifier element is connected between the self-holding relay and the load to convert the alternating current signal into a direct current signal, thereby being able to adjust the power factor of the direct current signal to adjust the load Operating frequency and work efficiency.

Among them, the rectifier element is usually a bridge structure, and each bridge arm includes a diode, the cathode of any diode is connected to the anode of an adjacent diode, and the anode of any diode is connected to the cathode of another adjacent diode. .

According to the drive control circuit of the above embodiment of the present application, preferably, it further includes a capacitive element, which is provided between the output end of the rectifier element and the input end of the load, and is used to filter the AC signal between the rectifier element and the load.

According to the drive control circuit of the embodiment of the present application, the capacitive element is arranged between the rectifying element and the input terminal of the load. On the one hand, the capacitive element helps reduce the impact of the ripple signal on the load during the power-on process, and on the other hand, On the one hand, capacitive components usually have an energy storage function. Therefore, when the load potential difference on the capacitive components is large enough, the load can be started.

Among them, the capacitive element can be one or more capacitors, which are connected in series or parallel. For example, the capacitive element can be an electrolytic capacitor or a film capacitor, but it is not limited to this.

According to the drive control circuit of the foregoing embodiment of the present application, preferably, the load includes at least one of the following: a DC motor, an AC motor, a lamp tube, a display, and a buzzer.

According to the embodiment of the second aspect of the present application, a household appliance is also proposed, including: a load; as in any of the above technical solutions, a drive control circuit is defined, a drive control circuit, and the drive control circuit is connected to the power grid system and the load. The drive control circuit is configured to control the grid system to supply power to the load.

According to the drive control circuit of the foregoing embodiment of the present application, preferably, the household electrical appliance includes at least one of an air conditioner, a refrigerator, a fan, a cooking appliance, a lighting device, an audio-visual device, and a cleaning device.

The household electrical appliance according to the embodiment of the present application has all the technical effects of the above-mentioned drive control circuit, which will not be repeated here.

The additional aspects and advantages of the present application will be partially given in the following description, and some will become obvious from the following description, or be understood through the practice of the present application.

Description of the drawings

Fig. 1 shows a schematic diagram of a drive control circuit according to an embodiment of the present application;

Fig. 2 shows a schematic diagram of a drive control circuit according to another embodiment of the present application;

Fig. 3 shows a schematic diagram of a drive control circuit according to another embodiment of the present application;

Fig. 4 shows a schematic diagram of a drive control circuit according to another embodiment of the present application;

Fig. 5 shows a schematic diagram of a drive control circuit according to another embodiment of the present application;

Fig. 6 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.

detailed description

In order to be able to understand the above objectives, features and advantages of the application more clearly, the application will be further described in detail below in conjunction with the accompanying drawings and specific implementations. It should be noted that the embodiments of the application and the features in the embodiments can be combined with each other if there is no conflict.

In the following description, many specific details are set forth in order to fully understand this application. However, this application can also be implemented in other ways different from those described here. Therefore, the scope of protection of this application is not covered by the specific details disclosed below. Limitations of the embodiment.

The drive control circuit according to the embodiment of the present application will be described in detail below with reference to FIGS. 1 to 6.

As shown in FIG. 1 to FIG. 6, the drive control circuit according to the embodiment of the present application includes: a self-holding relay. The moving contact of the self-holding relay is connected to the power grid system AC and can control the power grid system AC to supply power to the load; The bridge circuit is configured to output a pulse signal to the control terminal of the self-holding relay, the pulse signal is a high-level pulse signal or a low-level pulse signal, wherein the first control terminal _{Pi1 of the} self-holding relay receives High-level pulse signal. At the same time, the second control terminal _{Pi2 of the} self-holding relay receives a low-level pulse signal, and the moving contact of the self-holding relay switches actions, and keeps the last action switch before receiving the next pulse signal After the state, the action is switched from closed to open, or from open to closed.

According to the drive control circuit of the above embodiment of the present application, preferably, four bridge arms are provided in the bridge circuit, and any bridge arm is provided with a switch unit (as shown in Figs. 1 to 6 M ₁ , M ₂ , M ₃ and M ₄ ), if the switch unit is turned on, the corresponding bridge arm is turned on, and if the switch unit is turned off, the corresponding bridge arm is turned off.

According to the drive control circuit of the above embodiment of the present application, preferably, the four bridge arms are the first bridge arm, the second bridge arm, the third bridge arm, and the fourth bridge arm that are connected in sequence, and the first bridge arm and the second bridge arm The common terminal P _o1 between the arms is connected to the first control terminal P _{i1 of the} self-holding relay, and the common terminal P _o2 between the third bridge arm and the fourth bridge arm is connected to the second control terminal P _{i2 of the} self-holding relay, The common end between the first bridge arm and the fourth bridge arm is connected to the DC source VCC, and the common end between the second bridge arm and the third bridge arm is connected to the ground line GND, where, if the first bridge arm is turned on, At the same time, when the second bridge arm is turned off, the first control terminal _Pi1 receives a high-level pulse signal. If the first bridge arm is turned off and the second bridge arm is turned on, the first control terminal _Pi1 receives a low voltage. Flat pulse signal, if the fourth bridge arm is turned on and the third bridge arm is turned off at the same time, the second control terminal _Pi2 receives a high-level pulse signal, if the fourth bridge arm is turned off, at the same time, the third bridge arm is turned on , The second control terminal _Pi2 receives the low-level pulse signal.

According to the drive control circuit of the embodiment of the present application, the four bridge arms are set as the first bridge arm, the second bridge arm, the third bridge arm, and the fourth bridge arm that are sequentially connected, and the bridge circuit is connected to The self-holding relay is connected, wherein the common terminal P _o1 between the first bridge arm and the second bridge arm is connected to the first control terminal P _i1 , and the common terminal P _o2 between the third bridge arm and the fourth bridge arm is connected To the second control terminal _Pi2 , that is, by controlling the cut-off or conduction of the four bridge arms to adjust the action switching of the self-holding relay, not only can reduce power consumption, but also can shorten the action delay of controlling the self-holding relay, and further improve Reliability and timeliness of overcurrent protection of the load.

Example one:

As shown in FIG. 2, according to the drive control circuit of the above-mentioned embodiment of the present application, preferably, the first current limiting resistor, namely _Rd , connected in series between the bridge circuit and the DC source VCC, is used to limit the current of the bridge circuit. protection.

Embodiment two:

As shown in FIG. 3, according to the drive control circuit of the above-mentioned embodiment of the present application, preferably, the first current limiting resistor, namely R _g connected in series between the bridge circuit and the ground line GND, is used to limit the current of the bridge circuit. protection.

According to the drive control circuit of the embodiment of the present application, the bridge circuit is subjected to current limiting protection by setting the first current limiting resistor. On the one hand, it is beneficial to reduce the impact of the overcurrent signal in the power grid system AC on the bridge circuit. , When any bridge arm in the bridge circuit has a short-circuit fault, it can reduce the impact of the short-circuit current switch unit.

For example, if the first bridge arm and the second bridge arm are turned on at the same time, and there is no current-limiting resistor in series with the two bridge arms, the potential difference between the DC source VCC and the ground line GND will be sufficient to break down the first bridge The switch unit of the arm and the switch unit in the second bridge arm will not only cause the failure of the bridge circuit, but also the failure of the self-holding relay, which will cause the self-holding relay to lose the function of AC overcurrent protection for the load.

Among them, the voltage of the DC source VCC is usually 5V, 12V, or 24V, but it is not limited to this. The value of the first current-limiting resistor ranges from 0.1 ohm to 30 ohms (including endpoints), but it is not limited to this. The first current-limiting resistor can make the current flowing through the bridge circuit smaller than the overcurrent current of the switching element.

Preferably, since the leakage current of the MOSFET (usually including the enhancement type and the depletion type) is smaller and the reliability is higher, one embodiment is to select the P-type MOSFET as the switch tube of the first bridge arm (as shown in the figure). 1 to M ₁ shown in Fig. 6), the switching tube of the second bridge arm is an N-type MOSFET (M ₂ shown in Figs. 1 to 6), and the switching tube of the fourth bridge arm is a P-type MOSFET (as shown in 1 to M ₄ shown in Fig. 6), the switch tube of the third bridge arm is an N-type MOSFET (M ₃ shown in Figs. 1 to 6).

Example three:

As shown in Figure 4, the switching tube M ₁ of the first bridge arm is a P-type MOSFET, the switching tube M ₂ of the second bridge arm is an N-type MOSFET, and the switching tube M ₄ of the fourth bridge arm is a P-type MOSFET. switch bridge arm the MOSFET M ₃ is N-type, a first flow restrictor between the source and the drain switch to switch M ₂ M ₁ to the access resistance R _s1, the other second current limiting resistor R _s2 It is connected between the source of the switching tube M ₄ and the drain of the switching tube M ₃ .

Embodiment four:

As shown in Figure 5, the switching tube M ₁ of the first bridge arm is a P-type MOSFET, the switching tube M ₂ of the second bridge arm is an N-type MOSFET, and the switching tube M ₄ of the fourth bridge arm is a P-type MOSFET. switch bridge arm the MOSFET M ₃ is N-type, between the source and the drain of the switch M ₁ M ₂ of the switch a second current limiting resistor R _z1 access to the other second current limiting resistor R _z2 It is connected between the source of the switching tube M ₄ and the drain of the switching tube M ₃ .

Embodiment five:

As shown in Figure 5, the switching tube M ₁ of the first bridge arm is a P-type MOSFET, the switching tube M ₂ of the second bridge arm is an N-type MOSFET, and the switching tube M ₄ of the fourth bridge arm is a P-type MOSFET. The switch tube M ₃ of the bridge arm is an N-type MOSFET, a second current-limiting resistor R _{k1 is} connected between the drain of the switch tube M ₁ and the DC source VCC, and the other second current-limiting resistor R _{k2 is} connected to the switch Between the drain of the tube M ₄ and the DC source VCC.

Embodiment 6:

As shown in Figure 6, the switching tube M ₁ of the first bridge arm is a P-type MOSFET, the switching tube M ₂ of the second bridge arm is an N-type MOSFET, and the switching tube M ₄ of the fourth bridge arm is a P-type MOSFET. The switch tube M ₃ of the bridge arm is an N-type MOSFET, a second current-limiting resistor R _{e1 is} connected between the source of the switch tube M ₂ and the ground, and the other second current-limiting resistor R _{e2 is} connected to the switch tube Between the source of M ₃ and ground.

Embodiment Seven:

In any embodiment, the switch M at one end a second current limiting resistor R _g1 _a gate access, the access to this one point between the second current limiting resistor R _g1 and the other end of the direct current source VCC P _c1 Voltage resistance R _c1 .

Embodiment 8:

One end of this embodiment, the access gate of the switch M ₂ of a second current limiting resistor R _G2 In any embodiment, the access to this between a second current limiting resistor R P _c1 _g2 other end of the DC source VCC Voltage divider resistor R _c1 .

Example 9:

In any embodiment, one end of the switch M ₃ is a second access gate current limiting resistor R _g3, and between this second current limiting resistor R _g3 P _c2 and the other end of the DC source VCC is also connected Into the voltage divider resistor R _c2 .

Embodiment ten:

In any embodiment, one end of the switch M ₄ is a second access gate current limiting resistor R _g4, and between this second current limiting resistor R and the other end of the P _c2 _g4 VCC is also connected to the direct current source Into the voltage divider resistor R _c2 .

According to the drive control circuit of the above-mentioned embodiment of the present application, preferably, it further includes: a first drive device Q ₁ , the first drive device Q _{1 is} provided with a first drive signal output terminal, the drive terminal of the first bridge arm and the second The drive end of the bridge arm is connected to the first drive signal output end; wherein, the first drive signal output end outputs a high-level drive signal, or a first drive signal, to the drive end of the first bridge arm and the drive end of the second bridge arm The output end outputs a low-level drive signal to the drive end of the first bridge arm and the drive end of the second bridge arm.

According to the driving control circuit of the embodiment of the present application, the first driving signal output terminal is used as a control port to simultaneously drive the first bridge arm and the second bridge arm, that is, by providing a first driving device Q ₁ , in the above-mentioned embodiment Among them, the first bridge arm and the second bridge arm include inverted switch tubes, so that the first control terminal _{Pi1 can} receive a high-level pulse signal or a low-level pulse signal.

For example, the switching tube of the first bridge arm is a P-type MOSFET, the switching tube of the second bridge arm is an N-type MOSFET, and the drain of the P-type MOSFET of the first bridge arm is connected to the DC source VCC, and the source of the P-type MOSFET Connected to the drain of the N-type MOSFET of the second bridge arm, and the source of the N-type MOSFET of the second bridge arm is grounded to the ground line GND. If the first drive signal output terminal is connected to the P-type MOSFET of the first bridge arm and the second bridge arm If the N-type MOSFET outputs a high-level drive signal, the first bridge arm is cut off, the second bridge arm is turned on, and the first control terminal _{Pi1 of the} self-holding relay receives a low-level pulse signal. Similarly, if the first drive The signal output terminal outputs a low-level drive signal to the P-type MOSFET of the first bridge arm and the N-type MOSFET of the second bridge arm, and the first control terminal _{Pi1 of} the self-holding relay receives a high-level pulse signal.

According to the present embodiment described above driving control circuit applications, preferably, further comprising: a first drive means comprises at least one of Q _1: a metal oxide semiconductor, insulated gate bipolar transistor and transistor.

According to the driving control circuit of the embodiment of the present application, by setting the first driving device Q ₁ as the above-mentioned switch tube, it is beneficial to further reduce the power consumption and response delay of the driving control circuit, and it is also beneficial to improve the reliability of the circuit.

According to the drive control circuit of the above-mentioned embodiment of the present application, preferably, it further includes: a third current-limiting resistor, arranged on at least one of the gate, source and drain of the metal oxide semiconductor tube, and/or arranged on At least one of the base, emitter, and collector of the insulated gate bipolar transistor, and/or at least one of the base, emitter, and collector of the transistor, is used to connect the first driving device Q ₁ Perform current limiting protection.

The drive control circuit according to embodiments of the present application, by the third current limiting resistor disposed in a first three-terminal driving device Q ₁ and Q is possible to effectively reduce the possibility of _an interference signal or the overcurrent breakdown of the first drive means , Further improve the reliability of the bridge circuit to the self-holding relay control.

In any of the above embodiments, preferably, the first driving device Q _{1 is} selected as an insulated gate bipolar transistor and an NPN transistor, and the collector of the first driving device Q ₁ is connected to the first driving signal output terminal (ie Terminal P _c1 ), the emitter of the first driving device Q ₁ is connected to the ground line GND, the base of the first driving device Q ₁ is connected to an output port P _{d1 of the} controller, the output port P _d1 and the first driving device Q access a third current limiting resistor R _b1 between the electrode group _1, the electrode between the first driving device Q ₁ and the emitter is connected into another third current limiting resistor R _be1.

The above-mentioned controller may be an overall controller that drives the control circuit or a controller separately configured for the relay, such as MCU, CPU, embedded device, logic calculator, etc., but is not limited to this.

According to the driving control circuit of the above-mentioned embodiment of the present application, preferably, it further includes: a second driving device Q ₂ , the second driving device Q _{2 is} provided with a second driving signal output terminal, the driving terminal of the third bridge arm and the fourth The drive end of the bridge arm is connected to the second drive signal output end; wherein the second drive signal output end outputs a high-level drive signal, or a second drive signal, to the drive end of the third bridge arm and the drive end of the fourth bridge arm The output end outputs a low-level drive signal to the drive end of the third bridge arm and the drive end of the fourth bridge arm.

According to the drive control circuit of the embodiment of the present application, the second drive signal output terminal is used as a control port to simultaneously drive the third bridge arm and the fourth bridge arm, that is, by providing a second drive device Q ₂ , in the above-mentioned embodiment Among them, the third bridge arm and the fourth bridge arm include inverted switch tubes, so that the second control terminal _{Pi2 can} receive a high-level pulse signal or a low-level pulse signal.

For example, the switching tube of the fourth bridge arm is a P-type MOSFET, the switching tube of the third bridge arm is an N-type MOSFET, and the drain of the P-type MOSFET of the fourth bridge arm is connected to the DC source VCC, and the source of the P-type MOSFET Connected to the drain of the N-type MOSFET of the third bridge arm, and the source of the N-type MOSFET of the third bridge arm is grounded to the ground line GND. If the second drive signal output terminal is connected to the P-type MOSFET of the fourth bridge arm and the third bridge arm If the N-type MOSFET outputs a high-level drive signal, the fourth bridge arm is cut off and the third bridge arm is turned on. The second control terminal _{Pi2 of the} self-holding relay receives a low-level pulse signal. Similarly, if the second drive The signal output terminal outputs a low-level drive signal to the P-type MOSFET of the fourth bridge arm and the N-type MOSFET of the third bridge arm, and the second control terminal _{Pi2 of} the self-holding relay receives a high-level pulse signal.

According to the driving control circuit of the above-mentioned embodiment of the present application, preferably, it further includes: the second driving device Q ₂ includes at least one of the following: a metal oxide semiconductor tube, an insulated gate bipolar transistor, and a triode.

According to the drive control circuit of the embodiment of the present application, by setting the second drive device Q ₂ as the above-mentioned switch tube, it is beneficial to further reduce the power consumption and response delay of the drive control circuit, and it is also beneficial to improve the reliability of the circuit.

Preferably, the second driving device Q _{2 is} selected as an insulated gate bipolar transistor.

According to the drive control circuit of the above-mentioned embodiment of the present application, preferably, it further comprises: a fourth current-limiting resistor, which is arranged on at least one of the gate, source and drain of the metal oxide semiconductor tube, and/or arranged on At least one of the base, emitter, and collector of the insulated gate bipolar transistor, and/or at least one of the base, emitter, and collector of the transistor, is used to connect the second driving device Q ₂ Perform current limiting protection.

Embodiment of the drive control circuit according to the present application, by the fourth current-limiting resistor disposed on a second driving device Q ₂ is a three-terminal, can effectively reduce the possibility of signal interference or overcurrent breakdown of the second driving device Q ₂ , Further improve the reliability of the bridge circuit to the self-holding relay control.

In any of the above embodiments, preferably, the second driving device Q _{2 is} selected as an insulated gate bipolar transistor and an NPN transistor, and the collector of the second driving device Q ₂ is connected to the second driving signal output terminal (ie Terminal P _c2 ), the emitter of the second driving device Q ₂ is connected to the ground line GND, the base of the second driving device Q ₂ is connected to an output port P _{d2 of the} controller, the output port P _d2 and the second driving device Q access a third current-limiting resistor between the base electrode ₂ R _b2, and between the second driving electrode group ₂ and the device Q is connected into the emitter of a third further current limiting resistor R _be2.

Same as the first drive means is Q _1, the above-described drive controller may be integrated controller of the control circuit or controller configured separately relay, for example, MCU, CPU, and logic embedded devices like calculators, but not limited to this.

According to the drive control circuit of the foregoing embodiment of the present application, preferably, it further includes: a positive temperature coefficient temperature-sensitive resistor R _ptc , the positive temperature coefficient temperature-sensitive resistor R _{ptc is} connected in parallel to the self-holding relay, and the positive temperature coefficient temperature-sensitive resistor R _ptc is configured In order to limit the current of the power input from the power grid system, when the moving contact of the self-holding relay is in the open state, the power input from the power grid system AC powers the load through the positive temperature system temperature-sensitive resistor R _ptc , or self-holding When the moving contact of the relay is in the conducting state, the power input from the AC power grid system supplies power to the load through the moving contact of the self-holding relay.

According to the drive control circuit of the embodiment of the present application, the positive temperature coefficient usually refers to Positive Temperature Coefficient. Therefore, the positive temperature coefficient temperature-sensitive resistor R _ptc is usually referred to as PTC for short, that is, if the moving contact of the self-holding relay is in an open state , The AC input power of the grid system supplies power to the load through the PTC. If the power is too large, the temperature of the PTC will rise sharply, which will increase the resistance of the PTC to block the over-current signal. If the moving contact of the self-holding relay is in conduction In the on state, the power input from the AC power grid system supplies power to the load through the moving contact of the self-holding relay, and the power consumption of the electrical energy through the moving contact of the self-holding relay is very low, which is beneficial to improve the power supply efficiency.

According to the drive control circuit of the above-mentioned embodiment of the present application, preferably, further includes: a rectifying element connected between the self-holding relay and the load, the rectifying element is configured to convert an alternating current signal output by the AC of the grid system into a direct current signal, The direct current signal is configured to supply power to the load.

According to the drive control circuit of the above-mentioned embodiment of the present application, preferably, it further includes: a capacitive element C, which is arranged between the output terminal of the rectifier element and the input terminal of the load, and is used to filter the AC signal between the rectifier element and the load .

According to the drive control circuit of the embodiment of the present application, by placing the capacitive element C between the rectifying element and the input end of the load, on the one hand, the capacitive element C helps to reduce the impact of the ripple signal on the load during the power-on process. On the other hand, the capacitive element C usually has an energy storage function. Therefore, when the load potential difference on the capacitive element C is large enough, the load can be started.

Wherein, the capacitive element C may be one or more capacitors connected in series/or parallel connection. For example, the capacitive element C may be an electrolytic capacitor or a film capacitor, but is not limited to this.

According to the embodiment of the second aspect of the present application, a household appliance is also proposed, including: a load; as in any of the above technical solutions, a drive control circuit is defined, a drive control circuit, and the drive control circuit is connected to the power grid system AC and the load. In between, the drive control circuit is configured to control the grid system AC to supply power to the load.

The technical solution of the present application is described in detail above with reference to the accompanying drawings. Taking into account the technical problems in the related technology, the present application proposes a drive control circuit and a household appliance. By setting a self-holding relay in the drive control circuit, the self-holding relay It is a mechanical relay that can be self-maintained by the mechanical structure after being energized, without the need for continuous energization. This greatly reduces the energy consumption for long-time working occasions. The longer the working time, the lower the average energy consumption At the same time, the risk of damage caused by leakage and device heating is reduced, thereby prolonging the service life of the components in the above-mentioned drive control circuit.

The steps in the method of the embodiment of the present application can be sequentially adjusted, merged, and deleted according to actual needs, and the components in the embodiment of the present application can be merged, divided, and deleted according to actual needs. The above are only preferred embodiments of the application, and are not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

A drive control circuit, which includes:

A self-holding relay, the moving contact of the self-holding relay is connected to the power grid system, and can control the power grid system to supply power to the load;

A bridge circuit, the bridge circuit is configured to output a pulse signal to the control terminal of the self-holding relay, the pulse signal being a high-level pulse signal or a low-level pulse signal,

Wherein, the first control terminal of the self-holding relay receives the high-level pulse signal, and at the same time, the second control terminal of the self-holding relay receives the low-level pulse signal. The movable contact performs action switching, and maintains the state after the last action switch before receiving the next pulse signal, and the action switches from closing to opening, or from opening to closing.
The drive control circuit according to claim 1, wherein:

Four bridge arms are provided in the bridge circuit, and any one of the bridge arms is provided with a switch unit,

If the switch unit is turned on, the corresponding bridge arm is turned on,

If the switch unit is turned off, the corresponding bridge arm is turned off.
The drive control circuit according to claim 2, wherein:

The four bridge arms are a first bridge arm, a second bridge arm, a third bridge arm, and a fourth bridge arm that are sequentially connected, and the common end between the first bridge arm and the second bridge arm is connected to The first control end of the self-holding relay, the common end between the third bridge arm and the fourth bridge arm is connected to the second control end of the self-holding relay, and the first bridge arm is connected to the The common end between the fourth bridge arm is connected to a DC source, and the common end between the second bridge arm and the third bridge arm is connected to the ground wire,

Wherein, if the first bridge arm is turned on and the second bridge arm is turned off at the same time, the first control terminal receives the high-level pulse signal,

If the first bridge arm is turned off and the second bridge arm is turned on, the first control terminal receives the low-level pulse signal,

If the fourth bridge arm is turned on and at the same time, the third bridge arm is turned off, the second control terminal receives the high-level pulse signal,

If the fourth bridge arm is turned off and the third bridge arm is turned on, the second control terminal receives the low-level pulse signal.
The drive control circuit according to claim 3, further comprising:

The first current-limiting resistor is connected in series between the bridge circuit and the DC source, and/or between the bridge circuit and the ground wire, and the first current-limiting resistor is configured to The bridge circuit performs current limiting protection.
The drive control circuit according to claim 3, wherein:

If one of the switch unit in the first bridge arm and the switch unit in the second bridge arm is a P-type switch tube, the switch unit in the first bridge arm and the second bridge arm The other switch unit in the switch unit in the arm is an N-type switch tube,

If one of the switch unit in the third bridge arm and the switch unit in the fourth bridge arm is a P-type switch tube, the switch unit in the third bridge arm and the fourth bridge arm The other switch unit among the switch units in the arm is an N-type switch tube.
The drive control circuit according to any one of claims 2 to 5, wherein:

The switch unit includes at least one of the following: a metal oxide semiconductor tube, an insulated gate bipolar transistor, and a triode.
The drive control circuit according to claim 6, further comprising:

The second current-limiting resistor is set on at least one of the gate, source and drain of the metal oxide semiconductor tube, and/or set on the base, emitter and collector of the insulated gate bipolar transistor At least one of the electrodes, and/or at least one of the base, emitter and collector of the triode is used for current limiting protection of the switch unit.
The drive control circuit according to claim 3, further comprising:

A first driving device, the first driving device is provided with a first driving signal output terminal, and the driving terminal of the first bridge arm and the driving terminal of the second bridge arm are connected to the first driving signal output terminal ；

Wherein, the first drive signal output terminal outputs a high-level drive signal to the drive terminal of the first bridge arm and the drive terminal of the second bridge arm,

Or the first driving signal output terminal outputs a low-level driving signal to the driving terminal of the first bridge arm and the driving terminal of the second bridge arm.
The drive control circuit according to claim 8, further comprising:

The first driving device includes at least one of the following: a metal oxide semiconductor tube, an insulated gate bipolar transistor, and a triode.
The drive control circuit according to claim 9, further comprising:

The third current limiting resistor is provided on at least one of the gate, source, and drain of the metal oxide semiconductor tube, and/or on the base, emitter, and collector of the insulated gate bipolar transistor. At least one of the electrodes, and/or at least one of the base, emitter, and collector of the triode is used for current limiting protection of the first driving device.
The drive control circuit according to claim 3, further comprising:

A second driving device, the second driving device is provided with a second driving signal output terminal, and the driving terminal of the third bridge arm and the driving terminal of the fourth bridge arm are connected to the second driving signal output terminal ；

Wherein, the second drive signal output terminal outputs a high-level drive signal to the drive end of the third bridge arm and the drive end of the fourth bridge arm,

Or the second driving signal output terminal outputs a low-level driving signal to the driving terminal of the third bridge arm and the driving terminal of the fourth bridge arm.
The drive control circuit according to claim 11, further comprising:

The second driving device includes at least one of the following: a metal oxide semiconductor tube, an insulated gate bipolar transistor, and a triode.
The drive control circuit according to claim 12, further comprising:

The fourth current-limiting resistor is arranged on at least one of the gate, source and drain of the metal oxide semiconductor tube, and/or arranged on the base, emitter and collector of the insulated gate bipolar transistor At least one of the electrodes, and/or at least one of the base, emitter and collector of the triode is used for current limiting protection of the second driving device.
The drive control circuit according to any one of claims 1 to 5, further comprising:

A positive temperature coefficient temperature-sensitive resistor, the positive temperature coefficient temperature-sensitive resistor is connected in parallel with the self-holding relay, and the positive temperature coefficient temperature-sensitive resistor is configured to limit the electric energy input from the power grid system,

Wherein, when the moving contact of the self-holding relay is in the disconnected state, the electric energy input from the grid system supplies power to the load through the temperature-sensitive resistor of the positive temperature system,

Or when the moving contact of the self-holding relay is in a conducting state, the electric energy input by the grid system supplies power to the load through the moving contact of the self-holding relay.
The drive control circuit according to any one of claims 1 to 5, further comprising:

The rectifying element is connected between the self-holding relay and the load, and the rectifying element is configured to convert an alternating current signal output by the grid system into a direct current signal, and the direct current signal is configured to transmit to the Load power supply.
The drive control circuit according to claim 15, further comprising:

The capacitive element is arranged between the output end of the rectification element and the input end of the load, and is used to filter the AC signal between the rectification element and the load.
The drive control circuit according to any one of claims 1 to 5, wherein:

The load includes at least one of the following: a DC motor, an AC motor, a lamp tube, a display, and a buzzer.
A household electrical appliance, including:

load;

The drive control circuit according to any one of claims 1 to 17, wherein the drive control circuit is connected between the grid system and the load, and the drive control circuit is configured to control the grid system to supply power to the load .
The household electrical appliance according to claim 18, wherein:

The home appliance includes at least one of an air conditioner, a refrigerator, a fan, a cooking appliance, a lighting device, an audio-visual device, and a cleaning device.