A load control device

Abstract

The present invention proposes a load control device, which relates to the field of circuit technology. The load control device includes: an MCU chip; a driving circuit, including: a control module, whose input end is connected to the first output end of the MCU chip; a door signal detection module, whose first input end is connected to the door switch of the microwave oven, whose second input end is connected to the second output end of the MCU chip, whose third input end is connected to the second output end of the control module, whose first output end is connected to the MCU chip, and the door signal detection module includes a logic gate control circuit; a first load driving circuit, whose input end is connected to the second output end of the door signal detection module, and whose output end is connected to the first load through a first relay; a second load driving circuit, whose input end is connected to the output end of the control module, and whose output end is connected to the second load through a second relay. This technical solution can reduce circuit power consumption and save use costs.

Description

[Technical field]

[0001] The present invention relates to the field of circuit technology, and in particular to a load control device. [Background technology]

[0002] Microwave ovens have become a relatively popular kitchen appliance. They generally use microcontrollers such as MCU chips to control the on and off of various loads such as relays, lights, buzzers, motors, etc., thereby realizing various control functions.

[0003] However, the current microwave oven control circuit consumes a lot of power, wastes energy, and also makes the user's cost relatively high.

[0004] Therefore, how to reduce the power consumption of the microwave oven control circuit has become a technical problem that needs to be solved urgently. [Summary of the invention]

[0005] The embodiment of the present invention provides a load control device, which aims to solve the technical problem of excessive power consumption of the load control device in the related art, and can reduce the power consumption of the microwave oven control circuit, thereby saving the use cost.

[0006] On the one hand, an embodiment of the present invention provides a load control device for a microwave oven, comprising: an MCU chip; a drive circuit, the drive circuit being an integrated circuit chip, comprising: a control module, the input end of the control module being connected to the first output end of the MCU chip; a door signal detection module, the first input end of the door signal detection module being connected to the door switch of the microwave oven, the second input end of the door signal detection module being connected to the second output end of the MCU chip, the third input end of the door signal detection module being connected to the output end of the control module, the first output end of the door signal detection module being connected to the MCU chip, the door signal detection module comprising a logic gate control circuit; a first load drive circuit, the input end of the first load drive circuit being connected to the second output end of the door signal detection module, the output end of the first load drive circuit being connected to a first load via a first relay; a second load drive circuit, the input end of the second load drive circuit being connected to the output end of the control module, the output end of the second load drive circuit being connected to a second load via a second relay.

[0007] In the above embodiment of the present invention, optionally, the driving circuit also includes: a third load driving circuit, the input end of the third load driving circuit is connected to the third output end of the MCU chip, and the output end of the third load driving circuit is connected to the third load through a third relay.

[0008] In the above embodiment of the present invention, optionally, the number of the first load driving circuits is one or more that can be increased or decreased, and each of the first load driving circuits drives a corresponding first load; the number of the second load driving circuits is one or more that can be increased or decreased, and each of the second load driving circuits drives a corresponding second load; the number of the third load driving circuits is one or more that can be increased or decreased, and each of the third load driving circuits drives a corresponding third load.

[0009] In the above embodiment of the present invention, optionally, the first load driving circuit, the second load driving circuit and the third load driving circuit are Darlington transistor driving circuits.

[0010] In the above embodiment of the present invention, optionally, the first load, the second load and the third load include one or more of a lighting device, a sound-generating device and a motor.

[0011] In the above embodiment of the present invention, optionally, the door signal detection module also includes: a first transistor, the collector of the first transistor is connected to the MCU chip via a first resistor as the first output end of the door signal detection module, and the emitter of the first transistor is grounded; a second transistor, the collector of the second transistor is grounded via a second resistor and a third resistor connected in series, wherein the base of the first transistor is connected to the connection point between the second resistor and the third resistor, the base of the second transistor is connected to the power supply end via a fourth resistor, the base of the second transistor is connected to the door switch of the microwave oven via a fifth resistor as the first input end of the door signal detection module, the emitter of the second transistor is also connected to the power supply end, and the emitter of the second transistor is also connected to the collector of the first transistor and the logic gate control circuit via a sixth resistor.

[0012] In the above embodiment of the present invention, optionally, the logic gate control circuit has a first input terminal, a second input terminal and a third input terminal, wherein the first input terminal of the logic gate control circuit is connected to the collector of the first transistor; the second input terminal of the logic gate control circuit is connected to the second output terminal of the MCU chip as the second input terminal of the gate signal detection module; the third input terminal of the logic gate control circuit is connected to the output terminal of the control module as the third input terminal of the gate signal detection module; and the output terminal of the logic gate control circuit is connected to the first load driving circuit as the second output terminal of the gate signal detection module.

[0013] In the above embodiment of the present invention, optionally, the logic gate control circuit includes: an OR gate, wherein the first input end of the OR gate is connected to the first input end of the gate signal detection module as the first input end of the logic gate control circuit, and the second input end of the OR gate is connected to the output end of the control module via a first inverter as the third input end of the gate signal detection module; an NOR gate, wherein the first input end of the NOR gate is connected to the output end of the OR gate, and the second input end of the NOR gate is connected to the second output end of the MCU chip via a second inverter as the second input end of the gate signal detection module, and the output end of the NOR gate is connected to the input end of the first load driving circuit as the second output end of the gate signal detection module.

[0014] In the above embodiment of the present invention, optionally, the control module includes: a DC blocking capacitor; a third transistor, the base of the third transistor is connected to the DC blocking capacitor via a seventh resistor as the input end of the control module and connected to the first output end of the MCU chip, and is connected to the power supply end via an eighth resistor, the emitter of the third transistor is also connected to the power supply end, the collector of the third transistor is grounded via a ninth resistor and a tenth resistor connected in series, and the connection point of the ninth resistor and the tenth resistor is connected to the third input end of the gate signal detection module and the input end of the second load driving circuit as the output end of the control module.

[0015] Through the above technical scheme, a new load control device is provided to address the technical problem of excessive power consumption of the load control device in the related technology. The load control device is used in a microwave oven and consists of an MCU chip and a drive circuit, wherein the drive circuit includes: a control module, a door signal detection module, a second load drive circuit and a first load drive circuit.

[0016] Among them, the input end of the second load driving circuit is connected to the output end of the control module, and the input end of the control module is connected to the first output end of the MCU chip, so the second load driving circuit is controlled by the output signal from the MCU chip through the control module.

[0017] The input end of the first load driving circuit is connected to the second output end of the door signal detection module, and the first input end of the door signal detection module is connected to the door switch of the microwave oven, the second input end of the door signal detection module is connected to the second output end of the MCU chip, and the third input end of the door signal detection module is connected to the output end of the control module. The first load driving circuit is controlled by the door signal output by the door signal detection module, the output signal of the MCU chip and the output signal of the control module through the logic gate control circuit in the door signal detection module.

[0018] The above circuit not only controls the microwave oven, but also reduces the number of components in the circuit, thereby achieving the purpose of reducing the overall power consumption of the load control device, thereby saving the user's usage cost.

Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A circuit diagram of a load control device according to an embodiment of the present invention is shown;

[0021] Figure 2 Shows Figure 1 Internal schematic diagram of the medium load control device;

[0022] Figure 3 A circuit diagram of a load control device according to another embodiment of the present invention is shown;

[0023] Figure 4 A circuit diagram showing a load control device according to another embodiment of the present invention;

[0024] Figure 5 A circuit diagram of a load control device according to another embodiment of the present invention is shown;

[0025] Figure 6 A block diagram of a microwave oven according to an embodiment of the present invention is shown. [Specific implementation method]

[0026] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0029] Figure 1 A circuit diagram of a load control device according to an embodiment of the present invention is shown.

[0030] like Figure 1 As shown, a load control device 100 according to an embodiment of the present invention is used in a microwave oven, comprising: an MCU chip 102; a drive circuit 104, wherein the drive circuit 104 is an integrated circuit chip, comprising: a control module 1042, wherein an input end of the control module 1042 is connected to a first output end of the MCU chip 102; a door signal detection module 1044, wherein a first input end of the door signal detection module 1044 is connected to a door switch of the microwave oven, a second input end of the door signal detection module 1044 is connected to a second output end of the MCU chip 102, and a third input end of the door signal detection module 1044 is connected to a second output end of the control module 1042. The first output end of the gate signal detection module 1044 is connected to the MCU chip 102, and the gate signal detection module 1044 includes a logic gate control circuit 10442; a first load driving circuit 1046, the input end of the first load driving circuit 1046 is connected to the second output end of the gate signal detection module 1044, and the output end of the first load driving circuit 1046 is connected to the first load through a first relay; a second load driving circuit 1048, the input end of the second load driving circuit 1048 is connected to the output end of the control module 1042, and the output end of the second load driving circuit 1048 is connected to the second load through a second relay.

[0031] Specifically, the load control device 100 is used in a microwave oven, and is composed of an MCU chip 102 and a drive circuit 104 , wherein the drive circuit 104 includes: a control module 1042 , a door signal detection module 1044 , a second load drive circuit 1048 and a first load drive circuit 1046 .

[0032] Among them, the input end of the second load driving circuit 1048 is connected to the output end of the control module 1042, and the input end of the control module 1042 is connected to the first output end of the MCU chip 102, so the second load driving circuit 1048 is controlled by the output signal from the MCU chip 102 through the control module 1042.

[0033] The input end of the first load driving circuit 1046 is connected to the second output end of the door signal detection module 1044, and the first input end of the door signal detection module 1044 is connected to the door switch of the microwave oven, the second input end of the door signal detection module 1044 is connected to the second output end of the MCU chip 102, and the third input end of the door signal detection module 1044 is connected to the second output end of the control module 1042. The first load driving circuit 1046 is controlled by the door signal output by the door signal detection module 1044, the output signal of the MCU chip 102 and the output signal of the control module 1042 through the logic gate control circuit 10442 in the door signal detection module 1044.

[0034] The above circuit not only controls the microwave oven, but also reduces the number of components in the circuit, thereby achieving the purpose of reducing the overall power consumption of the load control device, thereby saving the user's usage cost.

[0035] exist Figure 1 In the illustrated embodiment, optionally, the drive circuit 104 also includes: a third load drive circuit 10410, the input end of the third load drive circuit 10410 is connected to the third output end of the MCU chip 102, and the output end of the third load drive circuit 10410 is connected to the third load through a third relay.

[0036] That is to say, the MCU chip 102 controls the third relay of the third load to close or open. When the control signal of the MCU chip 102 is a low-level signal, it is input to the third load driving circuit 10410, and the third load driving circuit 10410 outputs a high-level signal to drive the third relay to open. When the control signal of the MCU chip 102 is a high-level signal, it is input to the third load driving circuit 10410, and the third load driving circuit 10410 outputs a low-level signal to drive the third relay to close.

[0037] exist Figure 1 In the illustrated embodiment, optionally, the number of the first load driving circuits 1046 is one or more that can be increased or decreased, and each of the first load driving circuits 1046 drives a corresponding first load; the number of the second load driving circuits 1048 is one or more that can be increased or decreased, and each of the second load driving circuits 1048 drives a corresponding second load; the number of the third load driving circuits 10410 is one or more that can be increased or decreased, and each of the third load driving circuits 10410 drives a corresponding third load.

[0038] That is to say, the number of second load driving circuits 1048, the number of first load driving circuits 1046 and the number of third load driving circuits 10410 can be increased or deleted according to actual needs to control the required load, thereby greatly increasing the assembly flexibility of the load control device and helping to reduce production costs.

[0039] like Figure 2 As shown, the door signal detection module 1044 also includes a first transistor Q12, the collector of the first transistor Q12 is connected to the MCU chip via a first resistor R22 as a first output end of the door signal detection module 1044, and the emitter of the first transistor Q12 is grounded; a second transistor Q13, the collector of the second transistor Q13 is grounded via a second resistor R20 and a third resistor R21 connected in series, wherein the base of the first transistor Q12 is connected to a connection point between the second resistor R20 and the third resistor R21, the base of the second transistor Q13 is connected to a power supply end via a fourth resistor R23, the base of the second transistor Q13 is connected to the door switch of the microwave oven via a fifth resistor R24 ​​as a first input end of the door signal detection module 1044, the emitter of the second transistor Q13 is also connected to the power supply end, and the emitter of the second transistor Q13 is also connected to the collector of the first transistor Q12 and the logic gate control circuit 10442 via a sixth resistor R29.

[0040] Combination Figure 1 and Figure 2 As shown, the specific structure of the logic gate control circuit 10442 is described below.

[0041] The gate signal detection module 1044 includes a logic gate control circuit 10442, and the logic gate control circuit 10442 has a first input terminal, a second input terminal and a third input terminal, wherein the first input terminal of the logic gate control circuit 10442 is connected to the collector of the first transistor Q12; the second input terminal of the logic gate control circuit 10442 is connected to the second output terminal of the MCU chip 102 as the second input terminal of the gate signal detection module 1044; the third input terminal of the logic gate control circuit 10442 is connected to the output terminal of the control module 1042 as the third input terminal of the gate signal detection module 1044; the output terminal of the logic gate control circuit 10442 is connected to the first load driving circuit 1046 as the second output terminal of the gate signal detection module 1044.

[0042] The logic gate control circuit 10442 includes: an OR gate 104422, wherein the first input end of the OR gate 104422 is connected to the first input end of the gate signal detection module 1044 as the first input end of the logic gate control circuit 10442, and the second input end of the OR gate 104422 is connected to the output end of the control module 1042 via a first inverter 104426 as the third input end of the gate signal detection module 1044; an NOR gate 104424, wherein the first input end of the NOR gate 104424 is connected to the output end of the OR gate 104422, and the second input end of the NOR gate 104424 is connected to the second output end of the MCU chip 102 via a second inverter 104428 as the second input end of the gate signal detection module 1044, and the output end of the NOR gate 104424 is connected to the input end of the first load driving circuit 1048 as the second output end of the gate signal detection module 1044.

[0043] The principle of the load control device 100 is described in detail below through the above circuit connection relationship.

[0044] The first input end of the door signal detection module 1044 is connected to the door switch of the microwave oven, and can receive the signal from the door switch. When the door switch is opened, an opening signal is received through the first input end of the door signal detection module 1044, and it is converted into a high-level signal. The high-level signal is output to the OR gate 104422 of the logic gate control circuit 10442. For the OR gate 104422, no matter whether the input of the OR gate 104422 is a high-level signal or a low-level signal, its output is a high-level signal, and the high-level signal enters the NOR gate 104424, and the NOR gate 104424 is connected to the first load driving circuit via the first relay. For the NOR gate 104424, no matter whether the input of the NOR gate 104424 is a high-level signal or a low-level signal, its output is a low-level signal, and the low-level signal is finally input to the first relay, and the first relay is disconnected according to the low-level signal, and the first load is controlled to enter the closed state. It can be seen that when the door switch is opened, the first load driving circuit is only controlled by the door signal detection module 1044.

[0045] When the door switch is closed, a closing signal is received through the first input end of the door signal detection module 1044 and converted into a low-level signal. The first output end of the door signal detection module 1044 is connected to the MCU chip 102, and the MCU chip 102 transmits this low-level signal to the connected control module. When the door switch is closed, the door signal detection module 1044 sends a low-level signal to the MCU chip 102 and the OR gate 104422. The second input end of the OR gate 104422 is connected to the second output end of the control module 1042 through the first inverter 104426, so the OR gate 104422 is also controlled by the control module 1042 at this time. When the control module 1042 outputs a low-level signal, after the first inverter 104426 acts, the OR gate 104422 outputs a high-level signal. When the control module 1042 outputs a high-level signal, after the first inverter 104426 acts, the OR gate 104422 outputs a low-level signal. In addition, the output end of the OR gate 104422 is connected to the first input end of the NOR gate 104424; the NOR gate 104424, the second input end of the NOR gate 104424 is connected to the second output end of the MCU chip 102 via the second inverter 104428, then the output of the NOR gate 104424 is doubly controlled by the output of the OR gate 104422 and the second output end of the MCU chip 102, the output of the NOR gate 104424 controls the opening or closing of the first relay, wherein, when the output of the NOR gate 104424 is a high level signal, the first relay is closed to turn on the first load, and when the output of the NOR gate 104424 is a low level signal, the first relay is opened to disconnect the first load.

[0046] For the second load driving circuit 1048 and the second load, the MCU chip 102 controls the second relay connected to the second load to close or disconnect. Specifically, the MCU chip 102 inputs the received control signal to the control module, so that the control module outputs a high level signal or a low level signal. When the control module outputs a low level signal, the low level signal enters the second load driving circuit 1048, so that the second load driving circuit 1048 outputs a high level, drives the second relay to disconnect, and the second load is turned off. When the control module outputs a high level signal, the high level signal enters the second load driving circuit 1048, so that the second load driving circuit 1048 outputs a low level, drives the second relay to close, and the second load is turned on.

[0047] In the technical solution of the present invention, an OR gate 104422 and a NOR gate 104424 are introduced to control the load driving circuit. The control logic of the OR gate 104422 and the NOR gate 104424 is simple and has little effect on the current in the circuit, which helps to achieve effective control of loads that require high control accuracy.

[0048] In the related technology, the control signal of the MCU chip is input to the input end (gate) of the first load driving circuit, and the second output end of the gate signal detection module is connected to the driving end (source) of the first load driving circuit through the MOS tube. When the first load driving circuit is turned on, the MOS tube will generate a voltage drop, resulting in additional power consumption.

[0049] In the technical solution of the present invention, a logic gate control circuit 10442 is used to connect the input end (gate) of the OR gate 104422 to the first input end of the gate signal detection module 1044. When the first load driving circuit 1046 is turned on, the MOS tube in the gate signal detection module 1044 does not participate in the work, and no voltage drop is generated, so there is no additional power consumption, thereby reducing the useless power consumption of the circuit.

[0050] Specifically, the gate switch VS outputs high and low levels from the DS terminal through two MOS tubes, on the one hand to the MCU chip 102, and on the other hand outputs the signals of the logic gate control circuit 10442 and the control module 1042 and the control signal of the MCU chip 102 to the input terminal (gate) of the first load driving circuit 1046. When the first load driving circuit 1046 is turned on, the MOS tube in the gate signal detection module 1044 does not participate in the work, and there is no voltage drop on it, and there is no voltage drop on the logic gate control circuit 10442, so the power consumption is reduced.

[0051] In one implementation of the present invention, optionally, the control module 1042 only includes: a DC blocking capacitor C; a third transistor Q10, the base of the third transistor Q10 is connected to the DC blocking capacitor C as the input end of the control module 1042 through the seventh resistor R16 and connected to the first output end of the MCU chip 102, and is connected to the power supply end through the eighth resistor R17, the emitter of the third transistor Q10 is also connected to the power supply end, the collector of the third transistor Q10 is connected to the third input end of the gate signal detection module 1044 through the ninth resistor R18 and the tenth resistor R19 connected in series, and the connection point of the ninth resistor R18 and the tenth resistor R19 is connected to the third input end of the gate signal detection module 1044 as the output end of the control module 1042. Among them, the DC blocking capacitor C is external and plays a role in blocking the DC level. Since this control module 1042 only uses an external DC blocking capacitor C, the use of components is reduced as much as possible on the basis of ensuring the control capability, and the circuit cost is simplified.

[0052] like Figure 1 and Figure 2As shown, the number of the second load driving circuits 1048, the number of the first load driving circuits 1046 and the number of the third load driving circuits 10410 are all 2, and the second load driving circuit 1048, the first load driving circuit 1046 and the third load driving circuit 10410 drive the first loads 2a and 2b, the second loads 1a and 1b, and the third loads 3a and 3b respectively. The control method is as follows:

[0053] 1) When the door switch is turned on, the first relay controlling the load 1a is only controlled by the door signal detection module 1044, and is not controlled by the control module 1042 and the MCU chip 102, and is in a disconnected state;

[0054] 2) When the door switch is closed, the load 1a is controlled by the logic gate control circuit 10442 in the door signal detection module 1044, the control module 1042 and the MCU chip 102, and the logic is shown in Table 1 below:

[0055] Table 1

[0056] Control module 1042 output MCU chip 102 input Load 1a status 1 0 closure 0 1 closure 0 0 closure 1 1 Conductivity

[0057] That is, only when the control module 1042 outputs a high level signal and the MCU chip 102 inputs a high level signal, the first relay controlling the load 1a will be turned on, and at other times, the first relay controlling the load 1a is in a disconnected state.

[0058] like Figure 3 As shown, the number of first load driving circuits 1046, the number of second load driving circuits 1048 and the number of third load driving circuits 10410 are 2, 1 and 2 respectively. The first load driving circuit 1046, the second load driving circuit 1048 and the third load driving circuit 10410 drive the first load 1a and 1b, the second load 2a, and the third load 3a and 3b respectively.

[0059] like Figure 4 As shown, the number of first load driving circuits 1046, the number of second load driving circuits 1048 and the number of third load driving circuits 10410 are 3, 1 and 1 respectively. The first load driving circuit 1046, the second load driving circuit 1048 and the third load driving circuit 10410 drive the first loads 1a, 1b and 1c, the second load 2a and the third load 3a respectively.

[0060] like Figure 5As shown, the number of first load driving circuits 1046, the number of second load driving circuits 1048 and the number of third load driving circuits 10410 are 3, 1 and 3 respectively. The first load driving circuit 1046, the second load driving circuit 1048 and the third load driving circuit 10410 drive the first load 1a, 1b and 1c, the second load 2a, and the third load 3a, 3b and 3c respectively.

[0061] exist Figures 1 to 5 In any of the illustrated embodiments, the second load driving circuit 1048 , the first load driving circuit 1046 , and the third load driving circuit 10410 are Darlington transistor driving circuits.

[0062] The Darlington tube is also called a composite tube. Two transistors are connected in series to form an equivalent transistor. Take two transistors of the same polarity as an example. The collector of the front transistor is connected to the collector of the back transistor, and the emitter of the front transistor is connected to the base of the back transistor. The power of the front transistor is generally smaller than that of the back transistor. The base of the front transistor is the base of the Darlington tube, and the emitter of the back transistor is the emitter of the Darlington tube. The usage is the same as that of the transistor, and the amplification factor is the product of the amplification factors of the two transistors.

[0063] The amplification factor of the Darlington tube is the product of the original two, so the amplification factor is very high. It can amplify very small signals in highly sensitive amplifier circuits, such as high-power switching circuits. Therefore, the load is driven by the Darlington drive circuit to obtain stronger driving capability and driving reliability.

[0064] In one implementation of the present invention, optionally, the second load, the first load and the third load include but are not limited to one or more of a lighting device, a sound-generating device and a motor, and may also be any load element that needs to be used in a microwave oven.

[0065] In one implementation of the present invention, optionally, the output end of the second load driving circuit 1048, the output end of the first load driving circuit 1046, and the output end of the third load driving circuit 10410 are all connected to a freewheeling diode, and the freewheeling diode is connected in parallel with the load in the connected load driving circuit. The freewheeling diode is used to consume the reverse electromotive force generated by the load in the form of current, thereby providing switch protection for the load.

[0066] Figure 6 A block diagram of a microwave oven according to an embodiment of the present invention is shown.

[0067] like Figure 6 As shown, a microwave oven 600 according to an embodiment of the present invention comprises Figures 1 to 5 The load control device 100 of any embodiment, therefore, the microwave oven 600 has and Figures 1 to 5The same technical effects as any one of the embodiments will not be described in detail here.

[0068] The technical solution of the present invention is described in detail above in conjunction with the accompanying drawings. Through the technical solution of the present invention, the power consumption of the circuit can be reduced and the use cost can be saved.

[0069] It should be understood that, although the terms first, second, etc. may be used to describe the load driving circuit in the embodiments of the present invention, these load driving circuits should not be limited to these terms. These terms are only used to distinguish the load driving circuits from each other. For example, without departing from the scope of the embodiments of the present invention, the second load driving circuit may also be referred to as the first load driving circuit, and similarly, the first load driving circuit may also be referred to as the second load driving circuit.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A load control device for a microwave oven, characterized in that: include: MCU chip; The driving circuit is an integrated circuit chip, comprising: A control module, wherein an input end of the control module is connected to a first output end of the MCU chip, and the control module comprises: a DC blocking capacitor; A door signal detection module, wherein a first input end of the door signal detection module is connected to a door switch of the microwave oven, a second input end of the door signal detection module is connected to a second output end of the MCU chip, a third input end of the door signal detection module is connected to an output end of the control module, a first output end of the door signal detection module is connected to the MCU chip, and the door signal detection module includes a logic gate control circuit; a first load driving circuit, wherein an input end of the first load driving circuit is connected to a second output end of the gate signal detection module, and an output end of the first load driving circuit is connected to a first load through a first relay; a second load driving circuit, wherein an input end of the second load driving circuit is connected to an output end of the control module, and an output end of the second load driving circuit is connected to a second load through a second relay; The logic gate control circuit comprises a first input terminal, a second input terminal and a third input terminal, wherein: The first input terminal of the logic gate control circuit is connected to the first output terminal of the gate signal detection module; The second input end of the logic gate control circuit is connected to the second output end of the MCU chip as the second input end of the gate signal detection module; The third input terminal of the logic gate control circuit is connected to the output terminal of the control module as the third input terminal of the gate signal detection module; The output end of the logic gate control circuit is connected to the first load driving circuit as the second output end of the gate signal detection module.

2. The load control device according to claim 1, characterized in that: The driving circuit further includes: A third load driving circuit, wherein the input end of the third load driving circuit is connected to the third output end of the MCU chip, and the output end of the third load driving circuit is connected to the third load through a third relay.

3. The load control device according to claim 2, characterized in that: The number of the first load driving circuits is one or more which can be increased or decreased, and each of the first load driving circuits drives a corresponding first load; The number of the second load driving circuits is one or more which can be increased or decreased, and each of the second load driving circuits drives a corresponding second load; The number of the third load driving circuits is one or more and can be increased or decreased, and each of the third load driving circuits drives a corresponding third load.

4. The load control device according to claim 2, characterized in that: The first load driving circuit, the second load driving circuit and the third load driving circuit are Darlington transistor driving circuits.

5. The load control device according to claim 2, characterized in that: The first load, the second load and the third load include one or more of a lighting device, a sound generating device and a motor.

6. The load control device according to any one of claims 1 to 5, characterized in that: The door signal detection module also includes: A first transistor, wherein the collector of the first transistor is connected to the MCU chip via a first resistor as a first output end of the gate signal detection module, and the emitter of the first transistor is grounded; A second transistor, the collector of the second transistor is grounded via a second resistor and a third resistor connected in series, wherein the base of the first transistor is connected to a connection point between the second resistor and the third resistor, the base of the second transistor is connected to a power supply terminal via a fourth resistor, the base of the second transistor is connected to the door switch of the microwave oven via a fifth resistor as a first input terminal of the door signal detection module, the emitter of the second transistor is also connected to the power supply terminal, and the emitter of the second transistor is also connected to the collector of the first transistor and the logic gate control circuit via a sixth resistor.

7. The load control device according to claim 1, characterized in that: The logic gate control circuit comprises: An OR gate, wherein a first input terminal of the OR gate is connected to a first input terminal of the gate signal detection module as a first input terminal of the logic gate control circuit, and a second input terminal of the OR gate is connected to an output terminal of the control module via a first inverter as a third input terminal of the gate signal detection module; An NOR gate, wherein the first input end of the NOR gate is connected to the output end of the OR gate, the second input end of the NOR gate is connected to the second output end of the MCU chip as the second input end of the gate signal detection module via a second inverter, and the output end of the NOR gate is connected to the input end of the first load driving circuit as the second output end of the gate signal detection module.

8. The load control device according to claim 1, characterized in that: The control module also includes: A third triode, the base of the third triode is connected to the DC blocking capacitor via a seventh resistor as the input end of the control module and connected to the first output end of the MCU chip, and is connected to the power supply end via an eighth resistor, the emitter of the third triode is also connected to the power supply end, the collector of the third triode is grounded via a ninth resistor and a tenth resistor connected in series, and the connection point of the ninth resistor and the tenth resistor is connected to the third input end of the gate signal detection module and the input end of the second load driving circuit as the output end of the control module.

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