CN108062046B

CN108062046B - Driving method and driving device for switching circuit of household appliance and main control circuit

Info

Publication number: CN108062046B
Application number: CN201610979169.5A
Authority: CN
Inventors: 洪尧枝
Original assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date: 2016-11-07
Filing date: 2016-11-07
Publication date: 2021-03-19
Anticipated expiration: 2036-11-07
Also published as: CN108062046A

Abstract

The embodiment of the invention discloses a driving method, a driving device and a main control circuit of a switch circuit in a main control circuit of household electrical appliance equipment, wherein the main control circuit comprises: a switching circuit and a driving circuit of the switching circuit, the driving circuit including at least: a signal output module and a post-stage output module, the method comprising: acquiring a first driving signal of the switching circuit, wherein the first driving signal comprises an output signal of the signal output module or an output signal of the post-stage output module; determining attribute information of the first driving signal; judging whether the attribute information of the first driving signal meets a first preset condition or not; if the attribute information of the first driving signal does not meet a first preset condition, controlling the driving circuit to be switched off; and if the attribute information of the first driving signal meets a first preset condition, controlling the driving circuit to be conducted.

Description

Driving method and driving device for switching circuit of household appliance and main control circuit

Technical Field

The present invention relates to the field of power electronics technologies, and in particular, to a driving method, a driving apparatus, and a main control circuit for a switching circuit of a home appliance.

Background

An IGBT (Insulated Gate Bipolar Transistor) driving circuit of an electric control board of an existing electric cooker for home appliances generally includes circuits such as a main control single chip output, a push-pull amplifier, a post-stage output, and the like. The output of the single chip microcomputer is set according to user power, the working conditions of IGBT voltage and temperature are comprehensively calculated to limit IGBT driving signals so as to protect the IGBT from being burnt out due to over power, for example, the pulse width of the IGBT is limited, the turn-on moment is set or the pulse duty ratio is adjusted, because the IGBT driving signals are set according to the working conditions of the IGBT, once power grid interference occurs in a front end circuit (such as power grid voltage), or a part of circuits are affected with damp and short-circuited, parameters such as the output driving pulse width and the duty ratio of the IGBT are easily inconsistent with the original design, at the moment, because the width of the IGBT is in an uncontrolled state, the IGBT is easily driven to be abnormal, so that the IGBT part is burnt.

Disclosure of Invention

In view of this, embodiments of the present invention are intended to provide a driving method, a driving apparatus, and a main control circuit for a switching circuit of a home appliance, so as to avoid burning out of the switching circuit due to overcurrent or overvoltage of the switching circuit component caused by abnormal driving of the switching circuit of the home appliance.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

in a first aspect, an embodiment of the present invention provides a method for driving a switch circuit in a main control circuit of a home appliance, where the main control circuit includes: a switching circuit and a driving circuit of the switching circuit, the driving circuit including at least: a signal output module and a post-stage output module, the method comprising:

acquiring a first driving signal of the switching circuit, wherein the first driving signal comprises an output signal of the signal output module or an output signal of the post-stage output module;

determining attribute information of the first driving signal;

judging whether the attribute information of the first driving signal meets a first preset condition or not;

if the attribute information of the first driving signal does not meet a first preset condition, controlling the driving circuit to be switched off;

and if the attribute information of the first driving signal meets a first preset condition, controlling the driving circuit to be conducted.

In a second aspect, an embodiment of the present invention provides a method for driving a switch circuit in a main control circuit of a home appliance, where the main control circuit includes: a switching circuit and a driving circuit of the switching circuit, the driving circuit including at least: a signal output module and a post-stage output module, the method comprising:

acquiring a second driving signal of the switching circuit, wherein the second driving signal is an output signal of the signal output module;

acquiring a third driving signal of the switching circuit, wherein the third driving signal is an output signal of the rear-stage output module;

comparing the second driving signal with the third driving signal to obtain a first comparison result;

judging whether the first comparison result meets a second preset condition or not;

if the first comparison result does not meet a second preset condition, controlling the driving circuit to be switched off;

and if the first comparison result meets a second preset condition, controlling the drive circuit to be conducted.

In a third aspect, an embodiment of the present invention provides a main control circuit of a home appliance, where the main control circuit includes: a switching circuit and a driving circuit of the switching circuit, the driving circuit of the switching circuit including at least: signal output module, preceding stage monitoring module, push-pull amplifier module and back level output module, wherein:

the signal output module is used for outputting a second driving signal to the preceding stage monitoring module and outputting a second driving signal to the push-pull amplification module;

the preceding stage monitoring module is used for receiving a second driving signal output by the signal output module and receiving driving information of the switching circuit sent by the signal output module; judging whether the second driving signal meets a third preset condition or not; receiving a third driving signal output by the rear-stage output module, and judging whether the third driving signal meets a fourth preset condition; when the second driving signal does not meet a third preset condition or the third driving signal does not meet the fourth preset condition, controlling the driving circuit to be switched off; and when the second driving signal meets a third preset condition and the third driving signal meets a fourth preset condition, controlling the driving circuit to be conducted.

The push-pull amplification module is used for amplifying the second driving signal to obtain a fourth driving signal and outputting the fourth driving signal to a post-stage output module;

the rear-stage output module is used for receiving a fourth driving signal output by the push-pull amplification module, the fourth driving signal passes through the rear-stage output module to obtain a third driving signal, and the third driving signal is input to the switch circuit of the main control circuit.

In a fourth aspect, an embodiment of the present invention provides a main control circuit of a home appliance, where the main control circuit includes: a switching circuit and a driving circuit of the switching circuit, the driving circuit of the switching circuit including at least: signal output module, preceding stage monitoring module, push-pull amplifier module and back level output module, wherein:

the preceding stage monitoring module is used for receiving a second driving signal output by the signal output module; receiving a third driving signal output by the rear-stage output module; comparing the second driving signal with the third driving signal to obtain a first comparison result, judging whether the first comparison result meets a second preset condition, and controlling the driving circuit to be switched off if the first comparison result does not meet the second preset condition; if the first comparison result meets the second preset condition, controlling the drive circuit to be conducted;

the rear-stage output module is used for receiving a fourth driving signal output by the push-pull amplification module, the fourth driving signal passes through the rear-stage output module to obtain a third driving signal, and the rear-stage output module inputs the third driving signal to a switch circuit of the main control circuit.

In a fifth aspect, an embodiment of the present invention provides a driving apparatus for a switch circuit in a main control circuit of a home appliance, where the main control circuit includes: a switching circuit and a driving circuit of the switching circuit, the driving circuit of the switching circuit including at least: the device comprises a signal output module, a preceding stage monitoring module, a push-pull method module and a subsequent stage output module, wherein the device comprises:

the first acquisition module is used for acquiring a first driving signal of a switching circuit of household electrical appliance equipment, wherein the first driving signal comprises an output signal of the signal output module or an output signal of the rear-stage output module;

a first determining module for determining attribute information of the first driving signal;

the first judging module is used for judging whether the attribute information of the first driving signal meets a first preset condition or not;

the first control module is used for controlling the drive circuit of the switch circuit to be switched off if the attribute information of the first drive signal does not meet a first preset condition; and if the attribute information of the first driving signal meets a first preset condition, controlling the driving circuit of the switch circuit to be conducted.

In a sixth aspect, an embodiment of the present invention provides a driving apparatus for a switch circuit in a main control circuit of a home appliance, where the main control circuit includes: a switching circuit and a driving circuit of the switching circuit, the driving circuit of the switching circuit including at least: the device comprises a signal output module, a preceding stage monitoring module, a push-pull method module and a subsequent stage output module, wherein the device comprises:

the second acquisition module is used for acquiring a second driving signal of a switching circuit of the household appliance, wherein the second driving signal is an output signal of the signal output module;

the fourth obtaining module is used for obtaining a third driving signal of a switching circuit of the household appliance, wherein the third driving signal is an output signal of the rear-stage output module;

the comparison module is used for comparing the second driving signal with the third driving signal to obtain a first comparison result;

the second judgment module is used for judging whether the first comparison result meets a second preset condition or not;

the second control module is used for controlling the drive circuit of the switch circuit to be switched off if the first comparison result does not meet a second preset condition; and if the first comparison result meets a second preset condition, controlling a driving circuit of the switch circuit to be conducted.

The embodiment of the invention provides a driving method, a driving device and a main control circuit of a switch circuit in a main control circuit of household electrical appliance equipment, wherein the main control circuit comprises: a switching circuit and a driving circuit of the switching circuit, the driving circuit including at least: the device comprises a signal output module and a post-stage output module. Acquiring a first driving signal of the switching circuit, wherein the first driving signal comprises an output signal of the signal output module or an output signal of the post-stage output module; determining attribute information of the first driving signal; judging whether the attribute information of the first driving signal meets a first preset condition or not; if the attribute information of the first driving signal does not meet a first preset condition, controlling the driving circuit to be switched off; that is to say, when the attribute information of the output signal of the signal output module in the driving circuit or the output signal of the post-stage output module does not satisfy the first preset condition, the driving circuit of the switching circuit in the main control electronic control of the household appliance is controlled to be turned off, so that the phenomenon that the switching circuit component of the household appliance is burnt out due to overcurrent or overvoltage caused by abnormal driving can be avoided, the purpose of protecting the switching circuit is achieved, and the reliability of the product is further improved.

Drawings

Fig. 1-1 is a schematic diagram illustrating a main control circuit of a household electrical appliance in the related art;

fig. 1-2 are schematic structural diagrams of a main control circuit of a home appliance according to an embodiment of the present invention;

fig. 1-3 are schematic diagrams illustrating a flow chart of a method for driving a switch circuit of a home appliance according to an embodiment of the present invention;

fig. 2 is a schematic flow chart illustrating an implementation of a method for driving a switch circuit of a second household appliance according to an embodiment of the present invention;

fig. 3-1 is a schematic structural diagram of a main control circuit of five home appliances according to an embodiment of the present invention;

fig. 3-2 is a schematic structural diagram of a main control circuit of five home appliances according to an embodiment of the present invention;

fig. 4 is a driving apparatus of a switching circuit of a six-home appliance according to an embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the related art, a main control circuit of a home appliance is shown in fig. 1-1, a driving circuit of a switching circuit in the main control circuit generally includes a signal output module 110, a push-pull amplification module 111, and a post-stage output module 112, where in practical application, the signal output module may be implemented by an MCU (micro controller Unit). As can be seen from fig. 1-1, a driving signal output from an output pin of the main MCU is input to the push-pull amplifier module through the resistor R11, and the driving signal is amplified and then connected to a post-stage output circuit to drive a switching circuit (such as an IGBT or a MOS transistor). The existing circuit is not provided with a preceding stage monitoring circuit, a driving signal of a switching circuit is determined by a main control chip MCU, a third party does not carry out monitoring, and the switching circuit is easy to have abnormal driving, so that the switching circuit is burnt out to cause quality accidents.

In order to solve the technical problem, this embodiment provides a main control circuit, as shown in fig. 1-2, the main control circuit includes: signal output module 120, push-pull amplifier module 121, back-stage output module 122 and preceding stage monitoring module 123, wherein:

a signal output module 120, configured to output a preceding stage driving signal of the switch circuit, send driving information of the switch circuit to a preceding stage monitoring module, and receive control information of the protection switch circuit returned by the preceding stage monitoring module;

the push-pull amplification module 121 is configured to amplify a preceding-stage driving signal to obtain a rear-end driving signal;

a rear-stage output module 122, configured to output a rear-end driving signal to the switch circuit;

the front stage monitoring module 123 is configured to receive the driving information of the switching circuit sent by the signal output module, receive a front stage driving signal and a rear stage driving signal, perform a comparison analysis on the front stage driving signal and the rear stage driving signal to obtain a reasonable control scheme, and control the driving circuit of the switching circuit.

Compared with the main control circuit of the household electrical appliance shown in fig. 1-1 in the related art, the main control circuit provided in this embodiment adds a front stage monitoring module, which monitors a front stage output signal (i.e., a driving signal output by the signal output module) and a rear stage output signal (i.e., a driving signal output by the rear stage output module) of the switching circuit (IGBT), compares the front and rear stage signals of the switching circuit signal, calculates, analyzes, and obtains a reasonable control scheme, or turns off the driving output of the switching circuit, or reduces the pulse width of the driving signal of the switching circuit, or reduces the duty ratio of the driving signal of the switching circuit, so as to achieve the purpose of reasonably and safely controlling the switching circuit.

Example one

Based on the main control circuit shown in fig. 1-2, an embodiment of the present invention provides a method for driving a switch circuit of a home appliance, which can be applied to a main control circuit of an electronic device such as an electric cooker, an electromagnetic oven, an air conditioner, an oven, a microwave oven, and the like. Fig. 1 to 3 are schematic flow diagrams illustrating a driving method of a switch circuit of a home appliance according to an embodiment of the present invention, and as shown in fig. 1 to 3, the driving method includes:

step S101, a preceding stage monitoring module acquires a first driving signal of a switch circuit in a main control circuit of household electrical appliance equipment;

here, the master control circuit includes: a switching circuit and a driving circuit of the switching circuit, the driving circuit of the switching circuit including at least: the device comprises a signal output module, a preceding stage monitoring module, a push-pull amplification module and a subsequent stage output module. The first driving signal comprises an output signal of a signal output module in the driving circuit or an output signal of the rear-stage output module.

Step S102, the preceding stage monitoring module determines attribute information of the first driving signal;

here, the pre-stage monitoring module determines a pulse width of the first driving signal, a duty ratio of the first driving signal, and an amplitude of the first driving signal.

Step S103, the preceding stage monitoring module judges whether the attribute information of the first driving signal meets a first preset condition;

here, the preceding stage monitoring module receives driving information of the switching circuit output by the signal output module, where the driving information at least includes a pulse width threshold, a duty ratio threshold, and an amplitude threshold of a driving signal of the switching circuit; the preceding stage monitoring module generates a first preset sub-condition according to a pulse width threshold value in the driving information; the preceding stage monitoring module generates a second preset sub-condition according to a duty ratio threshold value in the driving information; and the preceding stage monitoring module generates a third preset sub-condition according to an amplitude threshold value in the driving information.

The preceding stage monitoring module judges whether the pulse width of the first driving signal meets a first preset sub-condition; or, the preceding stage monitoring module judges whether the duty ratio of the first driving signal meets a second preset sub-condition; or, the preceding stage monitoring module judges whether the amplitude of the first driving signal meets a third preset sub-condition; or the preceding stage monitoring module judges whether the pulse width of the first driving signal meets a first preset sub-condition and judges whether the duty ratio of the first driving signal meets a second preset sub-condition; or, the preceding stage monitoring module judges whether the duty ratio of the first driving signal meets a second preset sub-condition and judges whether the amplitude of the first driving signal meets a third preset sub-condition; or, the preceding stage monitoring module determines whether the pulse width of the first driving signal satisfies a first preset sub-condition and determines whether the amplitude of the first driving signal satisfies a third preset sub-condition; or, the preceding stage monitoring module determines whether the pulse width of the first driving signal satisfies a first preset sub-condition, determines whether the duty ratio of the first driving signal satisfies a second preset sub-condition, and determines whether the amplitude of the first driving signal satisfies a third preset sub-condition.

Step S104, if the attribute information of the first driving signal does not meet a first preset condition, the preceding stage monitoring module turns off the driving circuit of the switch circuit.

Here, when any one of the pulse width, the duty ratio and the amplitude of the first driving signal does not satisfy the corresponding first preset sub-condition, the second preset sub-condition and the third preset sub-condition, the preceding stage monitoring module controls to turn off the driving circuit.

In practical application, if the pulse width of the first driving signal does not satisfy a first preset sub-condition, the preceding stage monitoring module determines a first off-time of the driving circuit of the switching circuit according to the pulse width of the first driving signal and the first preset sub-condition, wherein the first off-time is used for representing a time for continuously outputting a first control signal; or if the duty ratio of the first driving signal does not meet a second preset sub-condition, the preceding stage monitoring module determines a first turn-off duration of a driving circuit of the switching circuit according to the duty ratio of the first driving signal and the second preset sub-condition; or if the amplitude of the first driving signal does not meet a third preset sub-condition, the preceding stage monitoring module determines a first turn-off duration of a driving circuit of the switching circuit according to the pulse width of the first driving signal and the duty ratio of the first driving signal;

the preceding stage monitoring module continuously outputs a first control signal to an output end of the signal output module according to the first turn-off duration, or the preceding stage monitoring module continuously outputs a second control signal to an output end of the subsequent stage output module according to the first turn-off duration, wherein the first control signal and the second control signal are used for controlling a driving circuit of the switching circuit to be turned off. The preceding stage monitoring module determines correction information of the first driving signal according to the first turn-off duration and attribute information of the first driving signal; and determining the first turn-off duration and the correction information of the first driving signal as first control information, and sending the first control information to a signal output module.

For example, the pulse width of the first driving signal output by the signal output module is 2 milliseconds, and the maximum pulse width defined in the first preset sub-condition is 1 millisecond, the pre-stage monitoring module subtracts the maximum pulse width defined in the first preset sub-condition from the pulse width of the first driving signal output by the signal output module to determine that the first off-time is 1 millisecond, and the pre-stage monitoring module carries the first off-time in the first control information and sends the first control information to the signal output module. And the signal output module analyzes the first control information to obtain a first turn-off duration after receiving the first control information, and determines the attribute information of the next driving signal according to the first turn-off duration and the correction information of the first driving signal so as to output a reasonable driving signal.

Step S105, if the attribute information of the first driving signal satisfies a first preset condition, the front stage monitoring module controls the driving circuit of the switching circuit to be turned on.

In the embodiment of the invention, firstly, a preceding stage monitoring module acquires a first driving signal of a switching circuit, wherein the first driving signal comprises an output signal of a signal output module in the driving circuit or an output signal of a subsequent stage output module in the driving circuit, and determines attribute information of the first driving signal; judging whether the attribute information of the first driving signal meets a first preset condition or not; if the attribute information of the first driving signal does not meet a first preset condition, the preceding stage monitoring module controls to turn off the driving circuit of the switching circuit; that is to say, when the front-end driving signal (i.e., the driving signal output by the signal output module) or the rear-end driving signal (i.e., the driving signal output by the rear-stage output module) of the switching circuit does not satisfy the first preset condition, the front-stage monitoring module controls to turn off the driving circuit of the switching circuit, so that the component of the switching circuit of the household electrical appliance is prevented from being burned out due to overcurrent or overvoltage caused by abnormal driving, the purpose of protecting the switching circuit is achieved, and the reliability of the product is further improved.

Example two

The embodiment of the invention further provides a driving method of the switch circuit of the household appliance, and the method can be applied to the main control circuit of the household appliance such as an electric cooker, an electromagnetic oven, an air conditioner, an oven, a microwave oven and the like. The master control circuit includes: a switching circuit and a driving circuit of the switching circuit, the driving circuit of the switching circuit including at least: the device comprises a signal output module, a preceding stage monitoring module, a push-pull amplification module and a subsequent stage output module.

The driving method provided by the embodiment of the present invention is described below with reference to the above main control circuit, and fig. 2 is a schematic flow chart of a driving method of a switch circuit of a second household appliance according to an embodiment of the present invention, and as shown in fig. 2, the driving method includes:

step S201, a preceding stage monitoring module acquires a second driving signal of a switch circuit of the household appliance;

here, the second driving signal is an output signal of a signal output module in the driving circuit.

Step S202, the preceding stage monitoring module acquires a third driving signal of a switching circuit of the household appliance;

here, the third driving signal is an output signal of a subsequent output block in the driving circuit.

Step S203, the preceding stage monitoring module compares the second driving signal with the third driving signal to obtain a first comparison result;

here, since the second driving signal is an output signal of the signal output module, the second driving signal is input to the push-pull amplification module through a resistor to obtain a fourth driving signal, and the fourth driving signal is input to the post-stage output module to obtain a third driving signal, in practical applications, the post-stage output module is two resistors connected in parallel, so that the pulse width and the duty ratio of the second driving signal and the third driving signal should be the same, and different only in amplitude, in the case of no fault or abnormality. Here, the second driving signal and the third driving signal are compared, and the pulse width and the duty ratio of the second driving signal and the third driving signal are compared to compare the amplitude of the second driving signal and the amplitude of the third driving signal.

Step S204, the preceding stage monitoring module judges whether the first comparison result meets a second preset condition;

here, it is determined whether the first comparison result satisfies a fourth preset sub-condition; and if the first comparison result meets a fourth preset sub-condition, judging whether the first comparison result meets a fifth preset sub-condition. The fourth preset sub-condition may be that the pulse widths and the duty ratios of the second driving signal and the third driving signal are the same; the fifth preset sub-condition may be a preset difference of the amplitude of the second drive signal and the amplitude of the third drive signal.

Step S205, if the first comparison result does not satisfy a second preset condition, the preceding stage monitoring module controls to turn off the driving circuit;

in practical application, if the first comparison result does not satisfy a second preset condition, the preceding stage monitoring module determines attribute information of the second driving signal, where the attribute information at least includes a width and a duty ratio of a pulse signal; the preceding stage monitoring module determines a second turn-off time length of a driving circuit of the switching circuit according to the pulse width of the second driving signal and the duty ratio of the second driving signal, wherein the second turn-off time length is used for representing the time length for continuously outputting the first control signal or the second control signal; the preceding stage monitoring module continuously outputs a first control signal to an output end of the signal output module according to the second turn-off duration, or the preceding stage monitoring module continuously outputs a second control signal to an output end of the subsequent stage output module according to the second turn-off duration, where the first control signal and the second control signal are used for controlling a driving circuit of the switching circuit to be turned off.

And the preceding stage monitoring module determines correction information of the second driving signal according to the second turn-off duration and the attribute information of the second driving signal, determines the second turn-off duration and the correction information of the second driving signal as second control information, and sends the second control information to the signal output module. And the signal output module analyzes the second control information to obtain a second turn-off time length after receiving the second control information, and determines the attribute information of the next driving signal according to the second turn-off time length and the correction information of the second driving signal so as to output a reasonable driving signal.

In step S206, if the first comparison result satisfies a second preset condition, the front stage monitoring module controls the driving circuit to be turned on.

Therefore, in the embodiment, the output signal of the signal output module is compared with the output signal of the later-stage output module by the preceding-stage monitoring module in the main control circuit of the household appliance, whether the comparison result meets the second preset condition or not is judged, and the drive circuit of the switch circuit in the main control circuit is controlled to be turned off when the comparison result does not meet the second preset condition, so that the switch circuit component of the household appliance is prevented from being burnt out due to overcurrent or overvoltage caused by abnormal drive, the purpose of protecting the switch circuit is achieved, and the reliability of the product is improved.

EXAMPLE III

In order to solve the foregoing technical problem, an embodiment of the present invention provides a main control circuit of a home appliance, as shown in fig. 1-2, the main control circuit includes: a switching circuit and a driving circuit of the switching circuit, the driving circuit of the switching circuit including at least: signal output module 120, push-pull amplifier module 121, back-stage output module 122 and preceding stage monitoring module 123, wherein:

the signal output module 120 is configured to output a second driving signal to the preceding stage monitoring module, and is configured to output a second driving signal to the push-pull amplification module;

here, the signal output module 120 is further configured to: sending the driving information of the switch circuit to the preceding stage monitoring module, and receiving first control information sent by the preceding stage monitoring module; analyzing the first control information to obtain a first turn-off duration and correction information of a second driving signal; and determining the driving signal output next time according to the first turn-off duration and the correction information of the second driving signal.

The push-pull amplification module 121 is configured to amplify the second driving signal to obtain a fourth driving signal, and output the fourth driving signal to a subsequent output module.

The rear-stage output module 122 is configured to receive a fourth driving signal output by the push-pull amplification module, where the fourth driving signal passes through the rear-stage output module to obtain a third driving signal, and the third driving signal is input to the switch circuit of the main control circuit.

The preceding stage monitoring module 123 is configured to receive the second driving signal output by the signal output module, and receive the driving information of the switching circuit sent by the signal output module; judging whether the second driving signal meets a third preset condition or not; receiving a third driving signal output by the rear-stage output module, and judging whether the third driving signal meets a fourth preset condition; when the second driving signal does not meet a third preset condition or the third driving signal does not meet a fourth preset condition, controlling the driving circuit to be switched off, and when the second driving information meets the third preset condition and the third driving signal meets the fourth preset condition, controlling the driving circuit to be switched on;

here, the preceding stage monitoring module 123 includes: controller, first resistance and second resistance, wherein: one end of the first resistor is connected with the output end of the signal output module, the other end of the first resistor is connected with the controller, one end of the second resistor is connected with the output end of the push-pull amplifying circuit, the other end of the second resistor is connected with the controller, the resistors and the resistor 13 are both current-limiting turn-off resistors, and the controller comprises: a microprocessor or a logic chip.

The preceding stage monitoring module is also used for: receiving driving information of the switching circuit, which is output by a signal output module, wherein the driving information at least comprises a pulse width threshold value, a duty ratio threshold value and an amplitude threshold value of a driving signal of the switching circuit; generating a first preset sub-condition according to a pulse width threshold value in the driving information; generating a second preset sub-condition according to a duty ratio threshold value in the driving information; and generating a third preset sub-condition according to the amplitude threshold value in the driving information.

The preceding stage monitoring module is further configured to: if the pulse width of the second driving signal does not meet a first preset sub-condition, determining a first turn-off duration of a driving circuit of the switching circuit according to the pulse width of the second driving signal and the first preset sub-condition, wherein the first turn-off duration is used for representing the duration of continuously outputting a first control signal; or, if the duty ratio of the second driving signal does not satisfy a second preset sub-condition, determining a first turn-off duration of a driving circuit of the switching circuit according to the duty ratio of the second driving signal and the second preset sub-condition; or, if the amplitude of the second driving signal does not satisfy a third preset sub-condition, determining a first turn-off duration of a driving circuit of the switching circuit according to the pulse width of the second driving signal and the duty ratio of the first driving signal.

The preceding stage monitoring module is further configured to: and continuously outputting a first control signal to an output end of a signal output module according to the first turn-off duration, or continuously outputting a second control signal to an output end of a rear-stage output module according to the first turn-off duration, wherein the first control signal and the second control signal are used for controlling a drive circuit of the switch circuit to be turned off.

The preceding stage monitoring module is further configured to: determining correction information of the second driving signal according to the first turn-off duration and the attribute information of the second driving signal; and determining the first turn-off duration and the correction information of the second driving signal as first control information, and sending the first control information to a signal output module.

Example four

Based on the foregoing embodiment, an embodiment of the present invention further provides a main control circuit of a home appliance, where the main control circuit includes: a switching circuit and a driving circuit of the switching circuit, the driving circuit of the switching circuit including at least: signal output module, push-pull amplifier module, back level output module and preceding stage monitoring module, wherein:

here, the signal output module is further configured to: sending the driving information of the switch circuit to the preceding stage monitoring module, and receiving second control information sent by the preceding stage monitoring module; analyzing the second control information to obtain a second turn-off duration and correction information of a second driving signal; and determining the driving signal output next time according to the second turn-off duration and the correction information of the second driving signal.

The push-pull amplification module is used for amplifying the second driving signal to obtain a fourth driving signal and outputting the fourth driving signal to a post-stage output module.

The preceding stage monitoring module is used for receiving a second driving signal output by the signal output module; receiving a third driving signal output by the rear-stage output module; comparing the second driving signal with the third driving signal to obtain a first comparison result, judging whether the first comparison result meets a second preset condition, and controlling the driving circuit to be switched off when the first comparison result does not meet the second preset condition; when the first comparison result meets the second preset condition, controlling the drive circuit to be conducted;

here, the preceding stage monitoring module is further configured to: if the first comparison result does not meet a second preset condition, determining attribute information of the second driving signal or the third driving signal, wherein the attribute information at least comprises the width and the duty ratio of a pulse signal; determining a second turn-off duration of a driving circuit of the switching circuit according to the pulse width of the second driving signal and the duty ratio of the second driving signal; and continuously outputting a first control signal to an output end of a signal output module according to the second turn-off duration, or continuously outputting a second control signal to an output end of a rear-stage output module according to the second turn-off duration, wherein the first control signal and the second control signal are used for controlling a drive circuit of the switch circuit to be turned off.

The preceding stage monitoring module is further configured to: determining correction information of the second driving signal according to the second turn-off duration and the attribute information of the second driving signal; and determining the second turn-off duration and the correction information of the second driving signal as second control information, and sending the second control information to a signal output module.

EXAMPLE five

Based on the foregoing embodiments, this embodiment provides a main control circuit of a home appliance, where fig. 3-1 is a schematic diagram of a composition structure of a main control circuit of a five-home appliance according to an embodiment of the present invention, and as shown in fig. 3-1, the main control circuit includes: a switching circuit 31 and a driving circuit 32 of the switching circuit, the driving circuit 32 of the switching circuit including at least: a signal output module 320, a front stage monitoring module 321, a push-pull amplification module 322, and a rear stage output module 323, wherein:

the signal output module 320 includes a main microcontroller U11 and a resistor R11, and an output terminal of the main microcontroller U11 is electrically connected to a first terminal of the resistor R11.

The front stage monitoring module 321 comprises an auxiliary microcontroller U12, a resistor R12 and a resistor R13, wherein a first end of the resistor R12 is connected with a first end of a resistor R11, a second end of the resistor R12 is connected with an output end of the auxiliary microcontroller U12, a first end of the resistor R13 is connected with another output end of the auxiliary microcontroller U12, and a second end of the resistor R13 is connected with a G pole of the IGBT.

The push-pull amplification module 322 includes a power input VCC, a resistor R21, a resistor R22, a resistor R23, an NPN (Negative-Positive-Negative) transistor Q21, an NPN transistor Q22, and a PNP (Positive-Negative-Positive) transistor Q23, wherein: VCC is connected to a first end of the resistor R22 and a first end of the resistor R23, a second end of the resistor R22 is connected to a collector of the NPN transistor Q21, a second end of the resistor R22 is further connected to bases of the NPN transistor Q22 and the PNP transistor Q23, a first end of the resistor R21 is grounded, a second end of the resistor R21 is connected to a base of the NPN transistor Q21 and a second end of the resistor R11, a second end of the resistor R23 is connected to a collector of the NPN transistor Q22, an emitter of the NPN transistor Q22 is connected to an emitter of the PNP transistor Q23, and an emitter of the NPN transistor Q21 and a collector of the PNP transistor Q23 are connected to ground.

The rear-stage output module 323 comprises an IGBT, a resistor R32 and a resistor R33, wherein a first end of the resistor R32 and an emitter of an NPN transistor Q22 are connected with an emitter of a PNP transistor Q23, a second end of the resistor R32 is connected with a gate of the IGBT and a first end of a resistor R33, a first end of the resistor R33 is connected with the gate of the IGBT, and the emitter of the IGBT is grounded.

The existing main control circuit IGBT drive circuit generally comprises a signal output module, a push-pull amplification module and a rear-stage output module, wherein a drive signal output by an IGBT output pin of a main MCU (U11) is input into the push-pull amplification module through a resistor R11, and the drive signal is amplified and then input into the rear-stage output module to drive the IGBT to work. The IGBT driving of the previous circuit is limited only by a main control chip MCU, once the external interference or the influence of short time factors such as damp or instantaneous short circuit and the like occurs, the frequency or duty ratio and the turn-on time point of an IGBT driving signal are abnormal immediately, so that the voltage and current of the IGBT are influenced, and the serious situation can cause the over-power burnout of the IGBT. The prior circuit is not provided with a preceding stage monitoring module, and the embodiment of the invention introduces the preceding stage monitoring module. The mutual positions and connection relations are as follows:

the IGBT output pin (defined by chip design) of the slave microcontroller U11 is connected to one pin of the auxiliary microcontroller U12 of the front stage monitoring module through a resistor R12, and the pin can be used as an input signal for detecting the auxiliary microcontroller U12 pin and controlling the voltage of the pin to form high level or low level so as to achieve the purpose of controlling the IGBT. The other end of the G pin (one end of the resistor R32) or the resistor R32 of the rear-stage output circuit IGBT is connected to one pin of the auxiliary microcontroller U12 through the resistor R13, and the pin can also be used as an input signal for detecting the pin U12 and controlling the voltage of the pin to form a high level or a low level. In addition, two pins (with communication interface function) of the main microcontroller U11 are connected with two pins of the auxiliary microcontroller U12, and the two pins carry out serial communication, so that information sharing is realized and monitoring is carried out according to the information.

Here, the main microcontroller U11 and the auxiliary microcontroller U12 show only the circuitry primarily associated with the present invention, and pin connections for power, ground, and crystal signals are omitted.

The embodiment of the invention carries out analysis and calculation according to the driving characteristics of the IGBT to limit in real time and carry out secondary protection. Firstly, the main microcontroller U11 informs the auxiliary microcontroller U12 of the drive information of the IGBT through serial port communication, the drive information comprises the drive width of the current period and the previous period or the next several predicted periods, the information of the maximum drive width, the duty ratio and the like, the information is transmitted to the auxiliary microcontroller U12 through the serial port communication, and meanwhile, the main microcontroller U11 outputs the IGBT drive signal from the drive pin and reaches the G pole of the IGBT according to the traditional circuit. The auxiliary microcontroller U12 receives the IGBT driving signal output from the main microcontroller U11 and the subsequent amplified IGBT G-pole signal through the resistors R12 and R13. The auxiliary microcontroller U12 monitors, analyzes and processes the signals at any moment, such as whether the IGBT width exceeds a preset first target value, whether the IGBT width is reasonable or unreasonable, and whether the IGBT duty ratio exceeds a preset second target value, whether the IGBT duty ratio is reasonable or unreasonable; whether the IGBT has continuous turn-on phenomenon or not has start protection; whether the IGBT driving amplitude exceeds a preset third target value is reasonable or unreasonable to start protection; whether the front and rear stages (before the resistor R11 and after the resistor R32) of the IGBT driving signal are the same or not, and if the front and rear stages are the same, protection is started.

Here, when the width of the IGBT driving signal exceeds the first target value, the duty ratio exceeds the second target value, or when the IGBT is continuously turned on, the auxiliary microcontroller U12 controls the resistor R12 terminal to output a high level, and the resistor R13 terminal outputs a low level for several seconds, so that the driving width and the duty ratio of the IGBT can be reduced or the IGBT is not continuously turned on; when the IGBT driving amplitude exceeds a preset third target value, the auxiliary microcontroller U12 can control the resistor R12 end to output a high level, and the resistor R13 end outputs a low level to stop the IGBT driving output, so that the IGBT circuit safety is ensured. In addition, the auxiliary microcontroller U12 also returns various protection mechanisms to the main microcontroller U11 through serial communication, so that the main microcontroller U11 can inquire and better control the driving of the IGBT.

It can be seen from the above that some IGBT drive problems can be detected, monitored and protected by the auxiliary microcontroller U12 circuit due to interference or phenomena such as moisture, instantaneous short circuit and the like, so that the IGBT is prevented from burning out, the purpose of protecting the IGBT is achieved, and the reliability of the product is improved.

The technical scheme provided by the embodiment of the invention can be suitable for driving products in the field of IGBT and also comprises a driving circuit of a start-up device like an MOS tube. As an improvement, the auxiliary microcontroller U12 may be a logic chip instead of an MCU, and the U11 and the U13 may also be a single-wire communication or other Serial communication, which is not limited to I2C (Inter-Integrated Circuit), SPI (Serial Peripheral Interface), and the like. In addition, the sampling of the output signal of the rear end of the IGBT can be changed to a push-pull front end signal, in addition, the U12 chip can also be accessed to an IGBT voltage sampling signal, for example, the C-pole voltage signal of the IGBT in the figure 3-2 enters the U12 through the partial pressure of R14 and R15, the voltage can also be used for auxiliary judgment of the running state of the IGBT, and the information of the front end and the rear end is comprehensively calculated, analyzed and processed, so that a more reliable and reasonable IGBT monitoring output scheme is obtained.

EXAMPLE six

Based on the foregoing embodiments, this embodiment provides a driving apparatus for a switching circuit of a home appliance, and fig. 4 is a driving apparatus for a switching circuit of a home appliance according to a sixth embodiment of the present invention, as shown in fig. 4, the apparatus includes: a first obtaining module 41, a first determining module 42, a first judging module 43 and a first controlling module 44, wherein:

the first obtaining module 41 is configured to obtain a first driving signal of a switching circuit of the home appliance;

here, the first driving signal includes an input signal of a push-pull amplification module in a main control circuit of the home appliance or an output signal of the push-pull amplification module in the main control circuit;

the first determining module 42 is configured to determine attribute information of the first driving signal;

here, the first determining module 42 further includes: a first determination unit for determining a pulse width of the first drive signal; a second determination unit for determining a duty ratio of the first driving signal; a third determination unit for determining an amplitude of the first drive signal.

The first determining module 43 is configured to determine whether the attribute information of the first driving signal meets a first preset condition;

here, the first judging module 43 further includes: the first judging unit is used for judging whether the pulse width of the first driving signal meets a first preset sub-condition or not; the second judging unit is used for judging whether the duty ratio of the first driving signal meets a second preset sub-condition or not; and the third judging unit is used for judging whether the amplitude of the first driving signal meets a third preset sub-condition or not.

The first control module 44 is configured to control the driving circuit of the switching circuit to be turned off if the attribute information of the first driving signal does not satisfy a first preset condition, and to control the driving circuit of the switching circuit to be turned on if the attribute information of the first driving signal satisfies the first preset condition.

Here, the first control module 44 further includes: a fourth determining unit, configured to determine a first off-time of a driving circuit of the switching circuit according to the pulse width of the first driving signal and a first preset sub-condition if the pulse width of the first driving signal does not satisfy the first preset sub-condition, where the first off-time is used to represent a time duration for continuously outputting a first control signal; a fifth determining unit, configured to determine a first turn-off duration of a driving circuit of the switching circuit according to the duty cycle of the first driving signal and a second preset sub-condition if the duty cycle of the first driving signal does not satisfy the second preset sub-condition; a sixth determining unit, configured to determine a first turn-off duration of a driving circuit of the switching circuit according to a pulse width of the first driving signal and a duty ratio of the first driving signal if the amplitude of the first driving signal does not satisfy a third preset sub-condition; the first output unit is used for continuously outputting a first control signal to the output end of the signal output module according to the first turn-off duration, and the second output unit is used for continuously outputting a second control signal to the output end of the rear-stage output module according to the first turn-off duration, wherein the first control signal and the second control signal are used for controlling the drive circuit of the switch circuit to be turned off; a seventh determining unit, configured to determine correction information of the first driving signal according to the first turn-off duration and attribute information of the first driving signal; and the first sending unit is used for determining the first turn-off duration and the correction information of the first driving signal as first control information and sending the first control information to a signal output module.

The driving device further includes: the first receiving module is used for receiving the driving information of the switching circuit, which is output by the signal output module, wherein the driving information at least comprises a pulse width threshold value, a duty ratio threshold value and an amplitude threshold value of a driving signal of the switching circuit; the first generation module is used for generating a first preset sub-condition according to a pulse width threshold value in the driving information; the second generation module is used for generating a second preset sub-condition according to the duty ratio threshold value in the driving information; and the third generation module is used for generating a third preset sub-condition according to the amplitude threshold value in the driving information.

Here, it should be noted that: the above description of the embodiment of the driving apparatus of the switching circuit of the home appliance is similar to the description of the embodiment of the method, and has similar beneficial effects to the embodiment of the method, and therefore, the description is omitted. For technical details that are not disclosed in the embodiments of the driving apparatus of the switching circuit of the household electrical appliance of the present invention, please refer to the description of the embodiments of the method of the present invention for understanding, and therefore, for brevity, will not be described again.

EXAMPLE seven

Based on the foregoing embodiments, this embodiment further provides a driving apparatus for a switching circuit of a home appliance, where the driving apparatus includes: the second obtains module, fourth and obtains module, contrast module, second judgement module and second control module, wherein:

the second acquisition module is used for acquiring a second driving signal of a switching circuit of the household appliance;

here, the second driving signal is an input signal of a push-pull amplification block in a driving circuit of the switching circuit.

The fourth obtaining module is used for obtaining a third driving signal of a switching circuit of the household appliance;

here, the third driving signal is an output signal of a push-pull amplification block in a driving circuit of the switching circuit.

the second judging module is used for judging whether the first comparison result meets a second preset condition or not;

here, the second determination module further includes: a fourth judging unit, configured to judge whether the first comparison result satisfies a fourth preset sub-condition; and the fifth judging unit is used for judging whether the first comparison result meets a fifth preset sub-condition or not if the first comparison result meets the fourth preset sub-condition.

The second control module is configured to control the driving circuit of the switching circuit to be turned off if the first comparison result does not satisfy a second preset condition, and to control the driving circuit of the switching circuit to be turned on if the first comparison result satisfies the second preset condition.

Here, the second control module includes: an eighth determining unit, configured to determine attribute information of the second driving signal if the first comparison result does not satisfy a second preset condition, where the attribute information at least includes a width and a duty ratio of a pulse signal; a ninth determining unit, configured to determine a second off-time period of the driving circuit of the switching circuit according to a pulse width of the second driving signal and a duty ratio of the second driving signal, where the second off-time period is used to represent a time period for continuously outputting the first control signal or continuously outputting the second control signal; the third output unit is used for continuously outputting a first control signal to the output end of the signal output module according to the second turn-off duration; the fourth output unit is configured to continuously output a second control signal to an output end of a rear-stage output module according to the second turn-off duration, where the first control signal and the second control signal are used to control a driving circuit of the switching circuit to turn off; a tenth determining unit, configured to determine correction information of the second driving signal according to the second turn-off duration and attribute information of the second driving signal; and the second sending unit is used for determining the second turn-off duration and the correction information of the second driving signal as second control information and sending the second control information to a signal output module.

Here, it should be noted that: it should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a ROM (Read Only Memory), a magnetic disk, or an optical disk.

Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a magnetic or optical disk, or other various media that can store program code.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A method for driving a switch circuit in a main control circuit of a household appliance is characterized in that the main control circuit comprises: a switching circuit and a driving circuit of the switching circuit, the driving circuit including at least: the method comprises the following steps of:

the preceding stage monitoring module acquires a first driving signal of the switch circuit, wherein the first driving signal comprises an output signal of the signal output module or an output signal of the subsequent stage output module;

determining attribute information of the first driving signal;

if the attribute information of the first driving signal does not meet a first preset condition, determining a first turn-off duration of a driving circuit of the switching circuit, and controlling the driving circuit to turn off; determining correction information of the first driving signal according to the first turn-off duration and the attribute information of the first driving signal; determining the first turn-off duration and the correction information of the first driving signal as first control information, and sending the first control information to a signal output module;

2. The method of claim 1, wherein determining the attribute information of the first driving signal comprises determining at least one of the following information of the first driving signal:

pulse width, duty cycle, amplitude.

3. The method according to claim 2, wherein the determining whether the attribute information of the first driving signal satisfies a first preset condition comprises:

judging whether the pulse width of the first driving signal meets a first preset sub-condition or not;

and/or judging whether the duty ratio of the first driving signal meets a second preset sub-condition or not;

and/or judging whether the amplitude of the first driving signal meets a third preset sub-condition.

4. The method according to any one of claims 1 to 3, further comprising:

receiving driving information of the switching circuit, which is output by a signal output module, wherein the driving information at least comprises a pulse width threshold value, a duty ratio threshold value and an amplitude threshold value of a driving signal of the switching circuit;

generating a first preset sub-condition according to a pulse width threshold value in the driving information;

generating a second preset sub-condition according to a duty ratio threshold value in the driving information;

and generating a third preset sub-condition according to the amplitude threshold value in the driving information.

5. The method according to any one of claims 1 to 3, wherein the controlling the driving circuit of the switching circuit to turn off if the attribute information of the first driving signal does not satisfy a first preset condition comprises:

if the pulse width of the first driving signal does not meet a first preset sub-condition, determining a first turn-off duration of a driving circuit of the switching circuit according to the pulse width of the first driving signal and the first preset sub-condition, wherein the first turn-off duration is used for representing the duration of continuously outputting a first control signal; or, if the duty ratio of the first driving signal does not satisfy a second preset sub-condition, determining a first turn-off duration of a driving circuit of the switching circuit according to the duty ratio of the first driving signal and the second preset sub-condition; or, if the amplitude of the first driving signal does not satisfy a third preset sub-condition, determining a first turn-off duration of a driving circuit of the switching circuit according to the pulse width of the first driving signal and the duty ratio of the first driving signal;

and continuously outputting a first control signal to an output end of a signal output module according to the first turn-off duration, or continuously outputting a second control signal to an output end of a rear-stage output module according to the first turn-off duration, wherein the first control signal and the second control signal are used for controlling a drive circuit of the switch circuit to be turned off.

6. A method for driving a switch circuit in a main control circuit of a household appliance is characterized in that the main control circuit comprises: a switching circuit and a driving circuit of the switching circuit, the driving circuit including at least: a signal output module and a post-stage output module, the method comprising:

if the first comparison result does not meet a second preset condition, controlling the drive circuit to be conducted;

the comparing the second driving signal with the third driving signal to obtain a first comparison result includes: comparing the amplitude, the pulse width and the duty ratio of the second driving signal with the amplitude, the pulse width and the duty ratio of the third driving signal to obtain a first comparison result;

the judging whether the first comparison result meets a second preset condition includes:

judging whether the first comparison result meets a fourth preset sub-condition or not;

if the first comparison result meets a fourth preset sub-condition, judging whether the first comparison result meets a fifth preset sub-condition, wherein if the first comparison result meets the fifth preset sub-condition, determining that the first comparison result meets a second preset condition; if the first comparison result does not meet a fifth preset sub-condition, determining that the first comparison result does not meet a second preset condition, wherein the fourth preset sub-condition is that the pulse width and the duty ratio of the second driving signal are the same as those of the third driving signal; the fifth preset sub-condition is a preset difference value between the amplitude of the second driving signal and the amplitude of the third driving signal.

7. The method of claim 6, wherein controlling the driving circuit of the switching circuit to turn off if the first comparison result does not satisfy a second preset condition comprises:

if the first comparison result does not meet a second preset condition, determining attribute information of the second driving signal, wherein the attribute information at least comprises the width and the duty ratio of a pulse signal;

determining a second turn-off duration of a driving circuit of the switching circuit according to the pulse width of the second driving signal and the duty ratio of the second driving signal, wherein the second turn-off duration is used for representing a duration for continuously outputting the first control signal or continuously outputting the second control signal;

and continuously outputting a first control signal to an output end of a signal output module according to the second turn-off duration, or continuously outputting a second control signal to an output end of a rear-stage output module according to the second turn-off duration, wherein the first control signal and the second control signal are used for controlling a drive circuit of the switch circuit to be turned off.

8. The method of claim 7, further comprising:

determining correction information of the second driving signal according to the second turn-off duration and the attribute information of the second driving signal;

and determining the second turn-off duration and the correction information of the second driving signal as second control information, and sending the second control information to a signal output module.

9. A master control circuit of a home appliance, the master control circuit comprising: a switching circuit and a driving circuit of the switching circuit, the driving circuit of the switching circuit including at least: signal output module, preceding stage monitoring module, push-pull amplifier module and back level output module, wherein:

the signal output module is used for outputting a second driving signal to the preceding stage monitoring module and outputting a second driving signal to the push-pull amplification module; the switching circuit is also used for sending the driving information of the switching circuit to the preceding stage monitoring module and receiving the first control information sent by the preceding stage monitoring module; analyzing the first control information to obtain a first turn-off duration and correction information of a second driving signal; determining a driving signal to be output next time according to the first turn-off duration and the correction information of the second driving signal;

the preceding stage monitoring module is used for receiving a second driving signal output by the signal output module and receiving driving information of the switching circuit sent by the signal output module; judging whether the second driving signal meets a third preset condition or not; receiving a third driving signal output by the rear-stage output module, and judging whether the third driving signal meets a fourth preset condition; when the second driving signal does not meet a third preset condition or the third driving signal does not meet the fourth preset condition, controlling the driving circuit to be switched off; when the second driving signal meets a third preset condition and the third driving signal meets a fourth preset condition, controlling the driving circuit to be conducted;

10. The master control circuit of claim 9, wherein the pre-stage monitoring module comprises: controller, first resistance and second resistance, wherein: one end of the first resistor is connected with the output end of the signal output module, and the other end of the first resistor is connected with the controller; one end of the second resistor is connected with the output end of the push-pull amplifying circuit, and the other end of the second resistor is connected with the controller.

11. A master control circuit of a home appliance, the master control circuit comprising: a switching circuit and a driving circuit of the switching circuit, the driving circuit of the switching circuit including at least: signal output module, preceding stage monitoring module, push-pull amplifier module and back level output module, wherein:

the preceding stage monitoring module is used for receiving a second driving signal output by the signal output module; receiving a third driving signal output by the rear-stage output module; comparing the second driving signal with the third driving signal to obtain a first comparison result, judging whether the first comparison result meets a second preset condition, and controlling the driving circuit to be switched off when the first comparison result does not meet the second preset condition; when the first comparison result meets the second preset condition, controlling the drive circuit to be conducted; the comparing the second driving signal with the third driving signal to obtain a first comparison result includes: comparing the amplitude, the pulse width and the duty ratio of the second driving signal with the amplitude, the pulse width and the duty ratio of the third driving signal to obtain a first comparison result; the judging whether the first comparison result meets a second preset condition includes: judging whether the first comparison result meets a fourth preset sub-condition or not; if the first comparison result meets a fourth preset sub-condition, judging whether the first comparison result meets a fifth preset sub-condition, wherein if the first comparison result meets the fifth preset sub-condition, determining that the first comparison result meets a second preset condition; if the first comparison result does not meet a fifth preset sub-condition, determining that the first comparison result does not meet a second preset condition, wherein the fourth preset sub-condition is that the pulse width and the duty ratio of the second driving signal are the same as those of the third driving signal; a fifth preset sub-condition is a preset difference value between the amplitude of the second driving signal and the amplitude of the third driving signal;

12. A driving apparatus of a switching circuit in a main control circuit of a home appliance, the main control circuit comprising: a switching circuit and a driving circuit of the switching circuit, the driving circuit of the switching circuit including at least: signal output module, preceding stage monitoring module, push-pull amplifier module and back-end output module, the device includes:

the first control module is used for determining a first turn-off duration of a driving circuit of the switching circuit and controlling the driving circuit of the switching circuit to turn off if the attribute information of the first driving signal does not meet a first preset condition; determining correction information of the first driving signal according to the first turn-off duration and the attribute information of the first driving signal; determining the first turn-off duration and the correction information of the first driving signal as first control information, and sending the first control information to a signal output module; and if the attribute information of the first driving signal meets a first preset condition, controlling the driving circuit of the switch circuit to be conducted.

13. A driving apparatus of a switching circuit in a main control circuit of a home appliance, the main control circuit comprising: a switching circuit and a driving circuit of the switching circuit, the driving circuit of the switching circuit including at least: signal output module, preceding stage monitoring module, push-pull amplifier module and back-end output module, the device includes:

the second control module is used for controlling the drive circuit of the switch circuit to be switched off if the first comparison result does not meet a second preset condition; if the first comparison result meets a second preset condition, controlling a driving circuit of the switch circuit to be conducted; the comparing the second driving signal with the third driving signal to obtain a first comparison result includes: comparing the amplitude, the pulse width and the duty ratio of the second driving signal with the amplitude, the pulse width and the duty ratio of the third driving signal to obtain a first comparison result; the judging whether the first comparison result meets a second preset condition includes: judging whether the first comparison result meets a fourth preset sub-condition or not; if the first comparison result meets a fourth preset sub-condition, judging whether the first comparison result meets a fifth preset sub-condition, wherein if the first comparison result meets the fifth preset sub-condition, determining that the first comparison result meets a second preset condition; if the first comparison result does not meet a fifth preset sub-condition, determining that the first comparison result does not meet a second preset condition, wherein the fourth preset sub-condition is that the pulse width and the duty ratio of the second driving signal are the same as those of the third driving signal; the fifth preset sub-condition is a preset difference value between the amplitude of the second driving signal and the amplitude of the third driving signal.