CN113285424A

CN113285424A - Power supply circuit, control method of power supply circuit, cooking apparatus, and storage medium

Info

Publication number: CN113285424A
Application number: CN202110587421.9A
Authority: CN
Inventors: 熊锐; 王雪峰; 唐彬
Original assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date: 2021-05-27
Filing date: 2021-05-27
Publication date: 2021-08-20

Abstract

The invention provides a power supply circuit, a control method of the power supply circuit, cooking equipment and a storage medium, wherein the power supply circuit comprises a first power supply; a switching circuit; the first end of the sampling circuit is connected with the first power supply, the second end of the sampling circuit is grounded, the third end of the sampling circuit is connected with the switch circuit, and the fourth end of the sampling circuit is configured to respond to the on-off state of the switch circuit to output a level signal; and the controller is connected with the fourth end of the sampling circuit and used for determining the current on-off state of the switching circuit according to the level signal of the fourth end of the sampling circuit and controlling the switching circuit according to the current on-off state and the set on-off state. The power supply circuit can be controlled in time so as to avoid the switch circuit from being in an abnormal state to influence the load, and the stability and controllability of the operation of the power supply circuit are improved. The method and the device have the advantages that the efficiency of judging the on-off state of the switch circuit is high, and the potential safety hazard of a circuit system is avoided.

Description

Power supply circuit, control method of power supply circuit, cooking apparatus, and storage medium

Technical Field

The invention belongs to the technical field of equipment power supply, and particularly relates to a power supply circuit, a control method of the power supply circuit, cooking equipment and a readable storage medium.

Background

The existing technical scheme controls the on-off of the relay through the weak current part of the computer board, so that the switch of the strong current part load connected to the relay is controlled to form a control loop, the state of the relay cannot be detected, and when the relay is abnormally opened, the state of the relay cannot be effectively detected in time, so that potential safety hazards are easily caused.

Disclosure of Invention

The present invention is directed to solving one of the technical problems of the prior art or the related art.

To this end, a first aspect of the invention proposes a supply circuit.

A second aspect of the present invention provides a control method for a power supply circuit.

A third aspect of the present invention provides a cooking apparatus.

A fourth aspect of the present invention provides a cooking apparatus.

A fifth aspect of the invention proposes a readable storage medium.

In view of this, according to a first aspect of the present invention, there is provided a power supply circuit comprising: a first power supply; a switching circuit; the first end of the sampling circuit is connected with the first power supply, the second end of the sampling circuit is grounded, the third end of the sampling circuit is connected with the switch circuit, and the fourth end of the sampling circuit is configured to respond to the on-off state of the switch circuit to output a level signal; and the controller is connected with the fourth end of the sampling circuit and used for determining the current on-off state of the switching circuit according to the level signal of the fourth end of the sampling circuit and controlling the switching circuit according to the current on-off state and the set on-off state.

The power supply circuit provided by the invention comprises a first power supply, a switch circuit, a sampling circuit and a controller. The first end and the second end of the sampling circuit are respectively connected with a first power supply and a grounding end, the third end of the sampling circuit is connected with the switch circuit, the on-off state of the switch circuit can control and switch the on-off state from the first end to the second end of the sampling circuit, specifically, when the switch circuit is in the on-off state, the first end to the second end of the sampling circuit is conducted, and when the switch circuit is in the off state, the first end to the second end of the sampling circuit is disconnected. The fourth end of the sampling circuit is connected with an I/O port of the controller, and the on-off state from the first end to the second end of the sampling circuit enables the controller to receive different level signals. Specifically, when the first end to the second end of the sampling circuit are in a conducting state, the current flows from the first power supply to the ground terminal through the sampling circuit, the I/O port of the controller receives a low-level signal, and when the first end to the second end of the sampling circuit are in an open-circuit state, the current flows from the first power supply to the I/O port of the controller through the sampling circuit, and the I/O port of the controller receives a high-level signal. Therefore, in the case where the controller receives a low level signal, it can be determined that the first terminal to the second terminal of the sampling circuit are conductive, that is, the switching circuit is in a conductive state. In the case where the controller receives a high level signal, it can be determined that the first terminal to the second terminal of the sampling circuit are off, that is, the switching circuit is in an off state.

The controller is connected with the fourth end of the sampling circuit and can acquire the level signal transmitted by the sampling circuit, so that the current on-off state of the switching circuit is determined. The controller is also connected with the switch circuit and can send a control command to the switch circuit to control the on-off state of the switch circuit, and the control command stores a set on-off state. When the controller determines the current on-off state of the switch circuit, the current on-off state can be compared with the on-off state set in the control command sent to the switch circuit, whether the switch circuit is in an abnormal state or not is judged according to the comparison result, and the on-off state of the switch circuit is controlled according to the comparison result.

Specifically, if the detected current on-off state is different from the set on-off state, the switching circuit is considered to be in an abnormal state. And based on the situation that the on-off state is set to be on and the current on-off state is off, judging that the switch circuit is in an abnormal open circuit state, and controlling the switch circuit to execute the closing instruction again. And based on the condition that the on-off state is set to be off and the current on-off state is on, judging that the switch circuit is in an abnormal on-off state, and controlling the switch circuit to execute an off instruction.

According to the switching circuit, the sampling circuit is arranged, so that the controller can detect the on-off state of the switching circuit according to the level signal collected by the sampling circuit, and the current on-off state of the switching circuit can be determined in time. And the controller can judge whether the switch circuit is in an abnormal disconnection state or an abnormal closing state according to the current on-off state and the set on-off state, so that the switch circuit can be controlled in time when the switch circuit is in the abnormal state, the switch circuit is prevented from being in the abnormal state to influence the load, and the stability and controllability of the operation of the power supply circuit are improved. Compared with the prior art that the on-off state of the switch circuit can be judged only according to the running condition of the load, the method and the device have the advantages that the on-off state of the switch circuit is judged efficiently, and potential safety hazards of a circuit system are avoided.

In some embodiments, the switching circuit in the present application is a relay, optionally an electromagnetic relay. An electromagnetic relay includes an electromagnetic mechanism and a contact. Voltage or current is applied to two ends of the coil to generate electromagnetic force, and when the electromagnetic force is greater than the counter force of the spring, the armature is attracted to enable the normally open and normally closed contact to act; when the voltage or current of the coil drops or disappears, the armature releases and the contact point resets.

In addition, according to the power supply circuit in the above technical solution provided by the present invention, the following additional technical features may be further provided.

In one possible design, the sampling circuit includes: the first end of the first switch piece is connected with a first power supply, the second end of the first switch piece is grounded, and the control end of the first switch piece is connected with the switch circuit; and a first resistive element, a first terminal of which is connected to the first power supply, and a second terminal of which is connected to the first switching element.

In this design, the sampling circuit includes a first switching element and a first resistive element. The control end of the first switch piece can control the on-off state from the first end to the second end of the first switch piece, and the on-off state of the switch circuit can directly control the on-off state from the first end to the second end of the first switch piece as the control end of the first switch piece is connected with the switch circuit. The first resistive element is arranged between the first end of the first switch piece and the first power supply, and can play a role in limiting current, so that the first switch piece or the controller is prevented from being damaged due to impact of overlarge current on the first switch piece or the controller. The first and second terminals of the first switching part are connected to a first power supply and a ground terminal, respectively. When the first end to the second end of the first switch element are in a conducting state, the current generated by the first power supply flows to the grounding end after flowing through the first switch element, and the level signal acquired by the controller through the fourth end of the sampling circuit is a low level signal. When the first end to the second end of the first switch element are in an off state, the current generated by the first power supply cannot flow to the ground end, and the level signal acquired by the controller through the fourth end of the sampling circuit is a high level signal.

The switching circuit is large in driving voltage, the first power supply is small in voltage, the first switching piece which can be switched on and off according to the on-off state of the switching circuit is arranged in the sampling circuit, level signals can be directly collected with the sampling circuit through the controller, and the driving voltage in the switching circuit is prevented from directly acting on the controller.

The sampling circuit is internally provided with the first switching element, and the control end of the first switching element is connected with the switching circuit, so that the controller can determine the on-off state of the switching circuit according to the level signal transmitted by the sampling circuit. And the high-voltage current in the switch circuit is prevented from directly acting on the sampling end of the controller, so that the timeliness and the accuracy of the collected signal are ensured, and the service life of the controller is prolonged.

It is understood that when the switching circuit is a relay, the driving circuit of the relay is selected to be 12V, and the voltage of the first power source is selected to be 5V, and the first switching element is configured as a triode.

In one possible design, the sampling circuit further includes: the first end of the second resistive element is connected with the controller; and a first end of the first diode is connected with the second end of the second resistive element, a second end of the first diode is connected with the first end of the first switching element, and the first end to the second end of the first diode are conducted.

In this design, the sampling circuit further includes a second resistive element and a first diode. The first diode sets up between controller and first switch spare, and the electric current can flow to the second end of first diode from the first end of first diode, and under the condition that first switch spare switched on promptly, the electric current that first power produced can flow through first diode and first switch spare in proper order, avoids the electric current reverse flow of electric current first switch spare department to lead to the controller to damage. The second resistive element is arranged between the controller and the first diode, under the condition that the first switch element is disconnected, current generated by the first power supply flows to the sampling end of the controller after flowing through the first resistive element and the second resistive element, and the current at the first power supply reaches the sampling end of the controller after twice current limiting through the first resistive element and the second resistive element, so that the controller is prevented from being impacted by overlarge current.

The second resistive element for limiting the current and the first diode for controlling the current direction are arranged in the sampling circuit, so that the sampling end of the controller can be prevented from being impacted by the current reversely, the current flowing through the sampling end of the controller is limited, and the protection effect on the sampling end of the controller is achieved.

In one possible design, the switching circuit includes: a second power supply; and the first end of the second switch piece is connected with the second power supply, the second end of the second switch piece is connected with the fourth end of the sampling circuit, and the control end of the second switch piece is connected with the controller.

In this design, the switching circuit includes a second power source and a second switching element, and the second power source is a driving power source of the second switching element, that is, the current generated by the second power source can provide electric energy for the action of the second switching element. The first end and the second end of the second switch piece are respectively connected with the second power supply and the sampling circuit, the control end of the second switch piece is connected with the controller, the controller can control the on-off state of the first end and the second end of the second switch piece, the controller collects high and low level signals through the sampling circuit and determines the on-off state of the second switch piece according to the high and low level signals, and therefore the controller can control the second switch piece according to the on-off state of the second switch piece.

Optionally, the second switch is an electromagnetic relay, the electromagnetic relay needs a driving current, and the second power supply is a driving power supply of the second switch and is capable of providing electric energy to the second switch. Namely, the coil of the electromagnetic relay is electrified to generate magnetism, so that the armature in the relay is attracted.

In one possible design, the switching circuit further includes: and the first end of the third switch piece is connected with the second end of the second switch piece, the second end of the third switch piece is grounded, and the control end of the third switch piece is connected with the controller.

In this design, the switching circuit further includes a third switching element. The first end and the second end of the third switching element are respectively connected with the second switching element and the ground terminal, i.e. the third switching element and the second switching element are connected in series between the second power supply and the ground terminal. When controlling the on-off state of the switch circuit, the third switch element and the second switch element need to be controlled simultaneously. The control end of the third switch element is also connected to the controller, and the controller can directly control the on-off state of the control end of the third switch element and the third switch element.

The third switch piece serving as the safety protection circuit is arranged in the switch circuit and is directly controlled by the controller, so that the switch circuit can be directly powered off through the third switch piece under the condition that the second switch piece breaks down, and the condition that the fault of the second switch piece affects the operation of the whole power supply circuit is avoided.

Specifically, the second switch element is in an abnormal closed state, that is, the controller issues a control instruction to the second switch element, so that the second switch element cannot be controlled to be switched off, and the controller controls the third switch element to be switched off, so that the switch circuit is powered off, and the power supply circuit is prevented from influencing the load when being in an abnormal conduction state.

In one possible design, the switching circuit further includes: and a first end of the second diode is connected with a first end of the second switching element, a second end of the second diode is connected with a second end of the second switching element, and the second end of the second diode is conducted to the first end.

In this design, the switching circuit further comprises a second diode, and a first end and a second end of the second diode are connected to a first end and a second end of the second switching element, respectively, that is, the second diode is connected in parallel to the second switching element. The second diode is a freewheeling diode and can protect the second switching element from being broken down or burned out by the induced voltage, so that the induced electromotive force in the second switching element is consumed in a continuous current mode in a loop, and the second switching element is protected from being damaged.

In one possible design, the switching circuit further includes: and a third resistive element, a first end of the third resistive element being connected to a first end of the third switching element, and a second end of the third resistive element being connected to a control end of the third switching element.

In the design, the switch circuit further comprises a third resistive element, the third resistive element is arranged between the third switch element and the control end, and the third resistive element plays a role in limiting the current between the control end and the third switch element, so that damage to the controller due to overlarge current is avoided.

In one possible embodiment, the number of second switching elements in the switching circuit is at least two, at least two second switching elements being connected in series with the third switching element.

In the design, the power supply circuit can supply power to a plurality of loads, each load is connected with the power supply circuit through one second switch piece, each second switch piece is correspondingly provided with one first switch piece, one first diode, one first resistive element and one second resistive element, and each first switch piece is connected to different signal acquisition ends of the controller. Therefore, the power supply circuit can detect the on-off state of the second switch piece corresponding to the loads.

According to a second aspect of the present invention, there is provided a control method for a power supply circuit as in the first aspect above, comprising: acquiring a set on-off state of a switch circuit; determining the current on-off state of the switch circuit according to the level signal; and controlling the switch circuit according to the current on-off state and the set on-off state.

The present invention provides a control method for a power supply circuit, which is used for controlling the power supply circuit in the first aspect. The set on-off state of the switch circuit is the on-off state corresponding to the control instruction sent to the switch circuit by the user through the controller. The controller collects level signals through the sampling circuit, and determines the current on-off state of the switch circuit according to the collected level, namely the on-off state of the switch circuit after the switch circuit receives a control instruction. By comparing the current on-off state with the set on-off state, whether the switch circuit is abnormal or not and the specific abnormal state of the switch circuit can be judged, and the controller can control the switch circuit according to the abnormal state, so that the problem of load damage caused by the fact that the switch circuit in the power supply circuit is in the abnormal state for a long time is avoided.

In addition, according to the control method of the power supply circuit in the above technical solution provided by the present invention, the following additional technical features may be further provided.

In one possible design, the step of controlling the switching circuit according to the current on-off state and the set on-off state specifically includes: determining the running state of the switch circuit according to the current on-off state and the set on-off state; controlling the switching circuit according to the operating state; wherein, the running state includes: a normal state, an abnormal on state, and an abnormal off state.

In the design, the current on-off state is compared with the set on-off state, and if the current on-off state is the same as the set on-off state, the switching circuit is judged to be in a normal state. And if the current on-off state is different from the set on-off state, judging that the switching circuit is in an abnormal state. And when the switching circuit is detected to be in an abnormal state and the switching circuit is in an opening state, judging that the switching circuit is in an abnormal opening state. And when the switching circuit is detected to be in the abnormal state and the switching circuit is in the closed state, judging that the switching circuit is in the abnormal closed state. The controller controls the switching circuit according to the operating state of the switching circuit.

Specifically, if the switch circuit is in a normal state, that is, the switch circuit can reach an appointed state according to the control instruction, the switch circuit does not need to be controlled for the second time, and the current on-off state of the switch circuit is maintained. If the switch circuit is in an abnormal opening state, namely the set on-off state of the switch circuit is off, and the current on-off state of the switch circuit is on, the controller can judge that the switch circuit needs to be controlled to be off again at the moment, and then sends an instruction for controlling the switch circuit to be off again to the switch circuit. If the switch circuit is in an abnormal closing state, namely the set on-off state of the switch circuit is the closing state of the switch circuit, and the current on-off state of the switch circuit is the opening state of the switch circuit, the switch circuit can be judged to need to be controlled to be closed again at the moment, and then an instruction for controlling the closing of the switch circuit is sent to the switch circuit again.

According to the method and the device, the running state of the switch circuit can be determined through the current on-off state and the set on-off state, and based on the fact that the switch circuit is in the abnormal state, the switch circuit can be sent with a control command for the second time, and the current on-off state of the switch circuit is adjusted, so that the load in the power supply circuit is prevented from being damaged.

In one possible design, the power supply circuit includes: the step of confirming the operating state of the switch circuit specifically comprises the following steps: determining that the switch circuit is in an abnormal opening state based on that the current on-off state is different from the set on-off state and the second switch piece is in the closed state; and determining that the switch circuit is in an abnormal closing state based on that the current on-off state is different from the set on-off state and the second switch piece is in the off state.

If the switch circuit is in a normal state, namely the switch circuit can reach an appointed state according to the control instruction, the secondary control on the switch circuit is not needed, and the current on-off state of the switch circuit is kept. If the switch circuit is in an abnormal opening state, namely the set on-off state of the switch circuit is off, and the current on-off state of the switch circuit is on, the controller can judge that the switch circuit needs to be controlled to be off again at the moment, and then sends an instruction for controlling the switch circuit to be off again to the switch circuit. If the switch circuit is in an abnormal closing state, namely the set on-off state of the switch circuit is the closing state of the switch circuit, and the current on-off state of the switch circuit is the opening state of the switch circuit, the switch circuit can be judged to need to be controlled to be closed again at the moment, and then an instruction for controlling the closing of the switch circuit is sent to the switch circuit again.

In a possible design, the power supply circuit further includes a third switch, a first end of the third switch is connected to a second end of the second switch, a second end of the third switch is grounded, a control end of the third switch is connected to the controller, and the step of controlling the switch circuit according to the current on-off state and the set on-off state and the operating state specifically includes: controlling the second switching element and the third switching element to be turned off based on the switching circuit being in the abnormal on state; and controlling the second switching piece and the third switching piece to be closed based on the switching circuit being in the abnormal closing state.

When the switch circuit is in an abnormal opening state, the switch circuit needs to be controlled to be opened, and the controller sends an instruction for opening the second switch element and the third switch element, so that the switch circuit is ensured to be in an open circuit state. When the switch circuit is in an abnormal closing state, the switch circuit needs to be controlled to be conducted, and the controller sends an instruction for conducting the second switch element and the third switch element to ensure that the switch circuit is in a conducting state.

Through setting up the third switch spare as the safety protection circuit, can avoid being in the unusual open mode because the second switch spare can't be controlled the disconnection and lead to the switching circuit, control the disconnection of third switch spare when the second switch spare can't be controlled the disconnection, can make the switching circuit be in the state of opening circuit, realized the effect to the load safety protection of power supply circuit.

In a possible design, the step of determining the current on-off state of the switch circuit according to the level signal specifically includes: determining that the switching circuit is in an open circuit state based on the level signal being a high level signal; and determining that the switch circuit is in a combined state based on the fact that the level signal is a low level signal.

In this design, a power supply circuit includes a first power supply, a switching circuit, a sampling circuit, and a controller. The first end and the second end of the sampling circuit are respectively connected with a first power supply and a grounding end, the third end of the sampling circuit is connected with the switch circuit, the on-off state of the switch circuit can control and switch the on-off state from the first end to the second end of the sampling circuit, specifically, when the switch circuit is in the on-off state, the first end to the second end of the sampling circuit is conducted, and when the switch circuit is in the off state, the first end to the second end of the sampling circuit is disconnected. The fourth end of the sampling circuit is connected with an I/O port of the controller, and the on-off state from the first end to the second end of the sampling circuit enables the controller to receive different level signals. Specifically, when the first end to the second end of the sampling circuit are in a conducting state, the current flows from the first power supply to the ground terminal through the sampling circuit, the I/O port of the controller receives a low-level signal, and when the first end to the second end of the sampling circuit are in an open-circuit state, the current flows from the first power supply to the I/O port of the controller through the sampling circuit, and the I/O port of the controller receives a high-level signal. Therefore, in the case where the controller receives a low level signal, it can be determined that the first terminal to the second terminal of the sampling circuit are conductive, that is, the switching circuit is in a conductive state. In the case where the controller receives a high level signal, it can be determined that the first terminal to the second terminal of the sampling circuit are off, that is, the switching circuit is in an off state.

According to a third aspect of the present invention there is provided a cooking apparatus comprising: a load; the power supply circuit according to any of the possible designs of the first aspect, wherein the power supply circuit is connected to a load.

The invention provides cooking equipment which comprises a load and a power supply circuit, wherein the power supply circuit can supply power to the load, the load is connected with a switch circuit in the power supply circuit, and the switch circuit can control the power-on state of the load.

It should be noted that, since the power supply circuit is the power supply circuit in the first aspect of the present invention, the power supply circuit has all the advantages of any possible design of the power supply circuit in the first aspect, and redundant description is not repeated herein.

According to a fourth aspect of the present invention there is provided a cooking apparatus comprising: a memory having a program or instructions stored therein; the processor, which executes the program or the instructions stored in the memory to implement the steps of the method for controlling the power supply circuit according to any one of the above second possible designs, has all the beneficial technical effects of the method for controlling the power supply circuit according to any one of the above possible designs, and is not described herein again.

According to a fifth aspect of the present invention, a readable storage medium is proposed, on which a program or instructions are stored, which when executed by a processor implement the steps of the control method of the power supply circuit as any one of the possible designs of the second aspect described above.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows one of the circuit diagrams of a power supply circuit in a first embodiment of the invention;

fig. 2 shows a second circuit diagram of the supply circuit in the first embodiment of the invention;

fig. 3 shows a third circuit diagram of the power supply circuit in the first embodiment of the invention;

fig. 4 shows one of schematic flow charts of a control method of a power supply circuit in a second embodiment of the present invention;

FIG. 5 is a second schematic flow chart of a control method of a power supply circuit in a second embodiment of the present invention;

fig. 6 shows a third schematic flow chart of a control method of a power supply circuit in a third embodiment of the invention;

fig. 7 shows a schematic block diagram of a cooking apparatus in a fourth embodiment of the present invention;

fig. 8 shows a schematic block diagram of a cooking apparatus in a fifth embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:

100 supply circuit, 110 first supply, 120 switching circuit, 122 second supply, 124 second switching element, 126 third switching element, 128 second diode, 129 third resistive element, 130 sampling circuit, 132 first switching element, 134 first resistive element, 136 second resistive element, 138 first diode.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A power supply circuit, a control method of the power supply circuit, a cooking apparatus, and a readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 8.

The first embodiment is as follows:

as shown in fig. 1, a first embodiment of the present invention provides a power supply circuit 100, including: a first power supply 110, a switching circuit 120, a sampling circuit 130, and a controller; a first terminal of the sampling circuit 130 is connected to the first power supply 110, a second terminal of the sampling circuit 130 is grounded, a third terminal of the sampling circuit 130 is connected to the switching circuit 120, and a fourth terminal of the sampling circuit 130 is configured to output a level signal in response to an on-off state of the switching circuit 120; the controller is connected to the fourth terminal of the sampling circuit 130, and the controller is configured to determine a current on-off state of the switch circuit 120 according to a level signal at the fourth terminal of the sampling circuit 130, and control the switch circuit 120 according to the current on-off state and a set on-off state.

The power supply circuit 100 provided by the invention comprises a first power supply 110, a switch circuit 120, a sampling circuit 130 and a controller. The first end and the second end of the sampling circuit 130 are respectively connected with the first power supply 110 and the ground terminal, the third end of the sampling circuit 130 is connected with the switch circuit 120, the on-off state of the switch circuit 120 can control and switch the on-off state from the first end to the second end of the sampling circuit 130, specifically, when the switch circuit 120 is in the on state, the first end to the second end of the sampling circuit 130 is connected, and when the switch circuit 120 is in the off state, the first end to the second end of the sampling circuit 130 is disconnected. The fourth terminal of the sampling circuit 130 is connected to the I/O port of the controller, and the on/off state from the first terminal to the second terminal of the sampling circuit 130 enables the controller to receive different level signals. Specifically, when the first terminal to the second terminal of the sampling circuit 130 are in a conducting state, the current flows from the first power supply 110 to the ground terminal through the sampling circuit 130, and then the I/O port of the controller receives the low level signal, and when the first terminal to the second terminal of the sampling circuit 130 are in an open state, the current flows from the first power supply 110 to the I/O port of the controller through the sampling circuit 130, and then the I/O port of the controller receives the high level signal. Therefore, in the case where the controller receives a low level signal, it can be determined that the first terminal to the second terminal of the sampling circuit 130 are conductive, that is, the switching circuit 120 is in a conductive state. In the case where the controller receives a high level signal, it can be determined that the first terminal to the second terminal of the sampling circuit 130 are turned off, that is, the switching circuit 120 is in an off state.

The controller is connected to the fourth terminal of the sampling circuit 130, and the controller can obtain the level signal transmitted by the sampling circuit, so as to determine the current on-off state of the switching circuit 120. The controller is further connected to the switch circuit 120, and the controller can send a control command to the switch circuit 120 to control the on/off state of the switch circuit 120, where the control command stores a set on/off state. When the controller determines the current on-off state of the switch circuit 120, the controller can compare the current on-off state with a set on-off state in a control command sent to the switch circuit 120, determine whether the switch circuit 120 is in an abnormal state according to a comparison result, and control the on-off state of the switch circuit 120 according to the comparison result.

Specifically, if the detected current on/off state is different from the set on/off state, the switch circuit 120 is considered to be in an abnormal state. Based on the situation that the on-off state is set to be on and the current on-off state is off, it is determined that the switch circuit 120 is in the abnormal off state, and the switch circuit 120 is controlled to execute the close command again. Based on the situation that the on-off state is set to be off and the current on-off state is on, it is determined that the switch circuit 120 is in an abnormal on-off state, and the switch circuit 120 is controlled to execute an off command.

By arranging the sampling circuit 130, the controller can detect the on-off state of the switch circuit 120 according to the level signal acquired by the sampling circuit 130, so that the current on-off state of the switch circuit 120 can be determined in time. And the controller can determine whether the switch circuit 120 is in an abnormal open state or an abnormal close state according to the current on-off state and the set on-off state, so that when the switch circuit 120 is in the abnormal state, the switch circuit 120 can be controlled in time, the switch circuit 120 is prevented from being in the abnormal state to influence the load, and the stability and controllability of the operation of the power supply circuit 100 are improved. Compared with the prior art that the on-off state of the switch circuit 120 can be judged only according to the running condition of the load, the method and the device have the advantages that the on-off state of the switch circuit 120 is judged efficiently, and potential safety hazards of a circuit system are avoided.

In some embodiments, the switching circuit 120 is a relay, preferably an electromagnetic relay. An electromagnetic relay includes an electromagnetic mechanism and a contact. Voltage or current is applied to two ends of the coil to generate electromagnetic force, and when the electromagnetic force is greater than the counter force of the spring, the armature is attracted to enable the normally open and normally closed contact to act; when the voltage or current of the coil drops or disappears, the armature releases and the contact point resets.

As shown in fig. 2, in any of the above embodiments, the sampling circuit 130 includes: a first switching element 132 and a first resistive element 134.

A first terminal of the first switching element 132 is connected to the first power source 110, a second terminal of the first switching element 132 is connected to ground, and a control terminal of the first switching element 132 is connected to the switching circuit 120.

A first terminal of the first resistive element 134 is connected to the first power supply 110, and a second terminal of the first resistive element 134 is connected to the first switching element 132.

In this embodiment, the sampling circuit 130 includes a first switching element 132 and a first resistive element 134. The control end of the first switch 132 can control the on-off state from the first end to the second end of the first switch 132, and since the control end of the first switch 132 is connected to the switch circuit 120, the on-off state of the switch circuit 120 can directly control the on-off state from the first end to the second end of the first switch 132. The first resistive element 134 is disposed between the first terminal of the first switching element 132 and the first power source 110, and can perform a current limiting function, so as to prevent the first switching element 132 or the controller from being damaged due to an impact caused by an excessive current on the first switching element 132 or the controller. The first and second terminals of the first switching part 132 are connected to the first power source 110 and the ground terminal, respectively. When the first end to the second end of the first switch 132 are in a conducting state, the current generated by the first power source 110 flows through the first switch 132 and then flows to the ground end, and the level signal collected by the controller through the fourth end of the sampling circuit 130 is a low level signal. When the first end to the second end of the first switch 132 are in an off state, the current generated by the first power source 110 cannot flow to the ground end, and the level signal collected by the controller through the fourth end of the sampling circuit 130 is a high level signal.

The driving voltage of the switch circuit 120 is large, and by setting the first power supply 110 with small voltage and arranging the first switch element 132 capable of executing on-off according to the on-off state of the switch circuit 120 in the sampling circuit 130, the level signal can be directly collected with the sampling circuit 130 through the controller, so that the driving voltage in the switch circuit 120 is prevented from directly acting on the controller.

The first switch member 132 is arranged in the sampling circuit 130, and the control end of the first switch member 132 is connected with the switch circuit 120, so that the controller can determine the on-off state of the switch circuit 120 according to the level signal transmitted by the sampling circuit 130. And the high-voltage current in the switch circuit 120 is prevented from directly acting on the sampling end of the controller, so that the timeliness and the accuracy of the acquired signal are ensured, and the service life of the controller is prolonged.

It is understood that when the switching circuit 120 is a relay, the driving circuit of the relay is selected to be 12V, the voltage of the first power source 110 is selected to be 5V, and the first switching element 132 is configured as a triode.

As shown in fig. 2, in any of the above embodiments, the sampling circuit 130 further includes: a second resistive element 136 and a first diode 138.

A first terminal of the second resistive element 136 is connected to the controller.

A first terminal of a first diode 138 is connected to the second terminal of the second resistive element 136, a second terminal of the first diode 138 is connected to the first terminal of the first switching element 132, and the first terminal to the second terminal of the first diode 138 are turned on.

In this embodiment, the sampling circuit 130 further includes a second resistive element 136 and a first diode 138. The first diode 138 is disposed between the controller and the first switching element 132, and the current can flow from the first terminal of the first diode 138 to the second terminal of the first diode 138, that is, when the first switching element 132 is turned on, the current generated by the first power source 110 can flow through the first diode 138 and the first switching element 132 in sequence, so as to prevent the current at the first switching element 132 from flowing in the reverse direction to the controller, which may cause the controller to be damaged. The second resistive element 136 is disposed between the controller and the first diode 138, and when the first switching element 132 is turned off, the current generated by the first power source 110 flows through the first resistive element 134 and the second resistive element 136 to the sampling terminal of the controller, and the current at the first power source 110 reaches the sampling terminal of the controller after twice current limiting through the first resistive element 134 and the second resistive element 136, so as to avoid the impact of an excessive current on the controller.

The second resistive element 136 for limiting the current and the first diode 138 for controlling the current direction are arranged in the sampling circuit 130, so that the current can be prevented from reversely impacting the sampling end of the controller, and the current flowing through the sampling end of the controller can be limited, thereby protecting the sampling end of the controller.

As shown in fig. 2, in any of the above embodiments, the switching circuit 120 includes: a second power supply 122 and a second switching member 124. The second power supply 122 is a driving power supply of the second switching element 124.

A first terminal of the second switching element 124 is connected to the second power supply 122, a second terminal of the second switching element 124 is connected to a fourth terminal of the sampling circuit 130, and a control terminal of the second switching element 124 is connected to the controller.

In this embodiment, the switch circuit 120 includes a second power source 122 and a second switch 124, and the second power source 122 is a driving power source of the second switch 124, that is, the current generated by the second power source 122 can provide power for the action of the second switch 124. The first end and the second end of the second switch 124 are respectively connected with the second power supply 122 and the sampling circuit 130, the control end of the second switch 124 is connected with the controller, so that the controller can control the on-off states of the first end and the second end of the second switch 124, the controller collects high and low level signals through the sampling circuit 130, and determines the on-off state of the second switch 124 according to the high and low level signals, thereby realizing that the controller can control the second switch 124 according to the on-off state of the second switch 124.

Alternatively, the second switch 124 is an electromagnetic relay, which requires a driving current, and the second power source 122 is a driving power source of the second switch 124, and is capable of providing power to the second switch 124. Namely, the coil of the electromagnetic relay is electrified to generate magnetism, so that the armature in the relay is attracted.

As shown in fig. 2, in any of the above embodiments, the switch circuit 120 further includes a third switch member 126.

A first terminal of the third switching element 126 is connected to a second terminal of the second switching element 124, a second terminal of the third switching element 126 is grounded, and a control terminal of the third switching element 126 is connected to the controller.

In this embodiment, the switching circuit 120 further includes a third switching element 126. The third switching part 126 has first and second terminals connected to the second switching part 124 and the ground terminal, respectively, i.e., the third switching part 126 and the second switching part 124 are connected in series between the second power source 122 and the ground terminal. In controlling the on-off state of the switch circuit 120, the third switching element 126 and the second switching element 124 need to be controlled simultaneously. The control end of the third switch member 126 is also connected to a controller, which can directly control the on-off state of the control end of the third switch member 126 and the third switch member 126.

By providing the third switching element 126 as a safety protection circuit in the switching circuit 120, the third switching element 126 is directly controlled by the controller, and in the event of a failure of the second switching element 124, the switching circuit 120 can be powered down directly by the third switching element 126, thereby preventing the failure of the second switching element 124 from affecting the operation of the overall power supply circuit 100.

Specifically, when the second switch 124 is in an abnormal closed state, that is, the controller issues a control command to the second switch 124 to disable the second switch 124 to control the second switch 124 to be turned off, the controller controls the third switch 126 to be turned off, so that the switch circuit 120 is powered down, and the power supply circuit 100 is prevented from affecting the load in an abnormal on state.

As shown in fig. 2, in any of the above embodiments, the switching circuit 120 further includes a second diode 128.

A first terminal of the second diode 128 is connected to the first terminal of the second switching element 124, a second terminal of the second diode 128 is connected to the second terminal of the second switching element 124, and the second terminal of the second diode 128 is conducted to the first terminal.

In this embodiment, the switching circuit 120 further comprises a second diode 128, and a first terminal and a second terminal of the second diode 128 are connected to a first terminal and a second terminal of the second switching element 124, respectively, i.e. the second diode 128 is connected in parallel with the second switching element 124. The second diode 128 is a freewheeling diode, and the second diode 128 can protect the second switching element 124 from breakdown or burning out of the induced voltage, so that the induced electromotive force in the second switching element 124 is dissipated in a continuous current manner in the loop, thereby protecting the second switching element 124 from being damaged.

In any of the embodiments described above, as shown in fig. 2, the switching circuit 120 further comprises a third resistive element 129.

A first terminal of the third resistive element 129 is connected to a first terminal of the third switching element 126, and a second terminal of the third resistive element 129 is connected to a control terminal of the third switching element 126.

In this embodiment, the switch circuit 120 further includes a third resistive element 129, the third resistive element 129 is disposed between the third switch 126 and the control terminal, and the third resistive element 129 performs a current limiting function between the control terminal and the third switch 126, so as to prevent the controller from being damaged due to an excessive current.

In any of the above embodiments, as shown in fig. 3, the number of the second switching elements 124 in the switching circuit 120 is at least two, and at least two of the second switching elements 124 are connected in series with the third switching element 126.

In this embodiment, the power supply circuit 100 can supply power to a plurality of loads, each load is connected to the power supply circuit 100 through one second switching element 124, each second switching element 124 is correspondingly provided with one first switching element 132, one first diode 138, one first resistive element 134 and one second resistive element 136, and each first switching element 132 is connected to a different signal acquisition terminal of the controller. Therefore, the power supply circuit 100 can detect the on-off state of the second switch element 124 corresponding to a plurality of loads.

As shown in fig. 3, in some embodiments, the power supply circuit 100 includes four second switching elements 124, one third switching element 126, and four first switching elements 132. The first switch 132 is selected to be a first transistor, the second switch 124 is selected to be a relay, and the third switch 126 is selected to be a second transistor.

The four relays are connected with a second triode in series, the second triode is used as a safety protection circuit, the control end of the second triode is directly connected with the controller, and the controller can directly control the on-off state of the second triode. The control end of the relay is also connected with the controller, the controller can directly control the on-off state of the relay, when the relay with faults exists in the four relays, and the faults of the relay are unable to be disconnected, the second triode can be controlled to be disconnected, and therefore the four relays connected with the third connecting pipe are powered off. Every relay all links to each other with the control end of first triode, and the collection end of controller can directly gather the on-off state of the relay that corresponds through four first triodes promptly.

Specifically, the switch circuit 120 includes a second power source 122 and four relays, and the second power source 122 is a driving power source for the four relays, i.e., the second power source 122 generates a current capable of supplying power for the actions of the four relays. The first ends and the second ends of the four relays are respectively connected with the second power supply 122 and the sampling circuit 130, the control ends of the four relays are connected with the controller, the controller can control the on-off states of the first ends and the second ends of the four relays, the controller collects high and low level signals through the sampling circuit 130, the on-off states of the four relays are determined according to the high and low level signals, and therefore the controller can control the four relays according to the on-off states of the four relays.

The switching circuit 120 further includes a second transistor. The first terminal and the second terminal of the second transistor are respectively connected to the four relays and the ground terminal, that is, the second transistor and the four relays are connected in series between the second power supply 122 and the ground terminal. In controlling the on/off state of the switch circuit 120, the second transistor and the four relays need to be controlled simultaneously. The control end of the second triode is also connected to the controller, and the controller can directly control the control end of the second triode and the on-off state of the second triode.

Through set up the second triode as safety protection circuit in switch circuit 120, the second triode is direct to be controlled by the controller, under the condition that four relays break down, can make switch circuit 120 directly fall the power down through the second triode, avoids the trouble of four relays to influence holistic power supply circuit 100's operation.

The four relays are in an abnormal closed state, namely, the controller issues a control instruction to the four relays to be incapable of controlling the four relays to be disconnected, and then the controller controls the second triode to be disconnected, so that the switch circuit 120 is powered off, and the power supply circuit 100 is prevented from influencing the load in an abnormal conduction state.

Example two:

as shown in fig. 4, a second embodiment of the present invention provides a control method of a power supply circuit, which is used for the power supply circuit in the first embodiment, and includes:

step 402, reading the set on-off state of the switch circuit stored in the controller;

step 404, judging the current on-off state of the switch circuit according to the level signal;

and 406, controlling the switching circuit according to the set on-off state and the current on-off state.

As shown in fig. 5, in any of the above embodiments, the step of controlling the switch circuit according to the current on-off state and the set on-off state specifically includes:

step 502, determining the running state of the switch circuit according to the set on-off state and the current on-off state;

and step 504, controlling the on-off state of the switch circuit according to the running state.

Wherein, the running state includes: a normal state, an abnormal on state, and an abnormal off state.

In this embodiment, by comparing the current on-off state with the set on-off state, if the current on-off state is the same as the set on-off state, it is determined that the switch circuit is in the normal state. And if the current on-off state is different from the set on-off state, judging that the switching circuit is in an abnormal state. And when the switching circuit is detected to be in an abnormal state and the switching circuit is in an opening state, judging that the switching circuit is in an abnormal opening state. And when the switching circuit is detected to be in the abnormal state and the switching circuit is in the closed state, judging that the switching circuit is in the abnormal closed state. The controller controls the switching circuit according to the operating state of the switching circuit.

In any of the above embodiments, the power supply circuit comprises: the step of confirming the operating state of the switch circuit specifically comprises the following steps: determining that the switch circuit is in an abnormal opening state based on that the current on-off state is different from the set on-off state and the second switch piece is in the closed state; and determining that the switch circuit is in an abnormal closing state based on that the current on-off state is different from the set on-off state and the second switch piece is in the off state.

In this embodiment, the switching circuit includes a second power source and a second switching element, and the second power source is a driving power source of the second switching element, that is, the current generated by the second power source can provide power for the action of the second switching element. The first end and the second end of the second switch piece are respectively connected with the second power supply and the sampling circuit, the control end of the second switch piece is connected with the controller, the controller can control the on-off state of the first end and the second end of the second switch piece, the controller collects high and low level signals through the sampling circuit and determines the on-off state of the second switch piece according to the high and low level signals, and therefore the controller can control the second switch piece according to the on-off state of the second switch piece.

In any of the above embodiments, the power supply circuit further includes a third switch, a first end of the third switch is connected to a second end of the second switch, a second end of the third switch is grounded, a control end of the third switch is connected to the controller, and the step of controlling the switch circuit according to the current on-off state and the set on-off state and the operating state specifically includes: controlling the second switching element and the third switching element to be turned off based on the switching circuit being in the abnormal on state; and controlling the second switching piece and the third switching piece to be closed based on the switching circuit being in the abnormal closing state.

In this embodiment, the switching circuit further includes a third switching element. The first end and the second end of the third switching element are respectively connected with the second switching element and the ground terminal, i.e. the third switching element and the second switching element are connected in series between the second power supply and the ground terminal. When controlling the on-off state of the switch circuit, the third switch element and the second switch element need to be controlled simultaneously. The control end of the third switch element is also connected to the controller, and the controller can directly control the on-off state of the control end of the third switch element and the third switch element.

In any of the above embodiments, the step of determining the current on-off state of the switch circuit according to the level signal specifically includes: determining that the switching circuit is in an open circuit state based on the level signal being a high level signal; and determining that the switch circuit is in a combined state based on the fact that the level signal is a low level signal.

In this embodiment, the power supply circuit includes a first power supply, a switching circuit, a sampling circuit, and a controller. The first end and the second end of the sampling circuit are respectively connected with a first power supply and a grounding end, the third end of the sampling circuit is connected with the switch circuit, the on-off state of the switch circuit can control and switch the on-off state from the first end to the second end of the sampling circuit, specifically, when the switch circuit is in the on-off state, the first end to the second end of the sampling circuit is conducted, and when the switch circuit is in the off state, the first end to the second end of the sampling circuit is disconnected. The fourth end of the sampling circuit is connected with an I/O port of the controller, and the on-off state from the first end to the second end of the sampling circuit enables the controller to receive different level signals. Specifically, when the first end to the second end of the sampling circuit are in a conducting state, the current flows from the first power supply to the ground terminal through the sampling circuit, the I/O port of the controller receives a low-level signal, and when the first end to the second end of the sampling circuit are in an open-circuit state, the current flows from the first power supply to the I/O port of the controller through the sampling circuit, and the I/O port of the controller receives a high-level signal. Therefore, in the case where the controller receives a low level signal, it can be determined that the first terminal to the second terminal of the sampling circuit are conductive, that is, the switching circuit is in a conductive state. In the case where the controller receives a high level signal, it can be determined that the first terminal to the second terminal of the sampling circuit are off, that is, the switching circuit is in an off state.

And if the detected current on-off state is different from the set on-off state, the switch circuit is considered to be in an abnormal state. And based on the situation that the on-off state is set to be on and the current on-off state is off, judging that the switch circuit is in an abnormal open circuit state, and controlling the switch circuit to execute the closing instruction again. And based on the condition that the on-off state is set to be off and the current on-off state is on, judging that the switch circuit is in an abnormal on-off state, and controlling the switch circuit to execute an off instruction.

Example three:

as shown in fig. 6, a third embodiment of the present invention provides a control method of a power supply circuit, which is used for the power supply circuit in the first embodiment, and includes:

step 602, acquiring a level signal through a sampling circuit:

step 604, determining whether the level signal is a high level signal, if so, performing step 606, and if so, performing step 608;

step 606, determining that the switching circuit is in an off state;

step 608, determining that the switch circuit is in a conducting state;

step 610, judging whether the set on-off state is the off state, if so, returning to the step 610, and if not, executing the step 612;

step 612, sending the opening instruction to the switch circuit again;

step 614, judging whether the set on-off state is the on state, if so, returning to the step 614, and if not, executing the step 616;

step 616, performing security protection.

In this design, the switching circuit includes a second power supply and a second switching element. The second power supply is a 12V driving power supply, and the second switch part is a relay. That is, the current generated by the 12V driving power supply can supply power for the operation of the relay. The first end and the second end of relay link to each other with 12V drive power supply and sampling circuit respectively, and the control end of relay links to each other with the controller, makes the controller can control the break-make state of relay first end and second end to the controller passes through sampling circuit and gathers high low level signal, and confirms the break-make state of relay according to high low level signal, thereby realized that the controller can control the relay according to the break-make state of relay.

The power supply circuit further comprises a third switching element, and the third switching element is selected to be a triode. The first end of triode links to each other with the second end of relay, and the second end ground connection of triode, the control end of triode link to each other with the controller, according to current on-off state and setting for the on-off state, according to the step of running state control switch circuit, specifically include: based on the abnormal opening state of the switching circuit, the relay and the triode are controlled to be disconnected; and controlling the relay and the triode to be closed based on the abnormal closing state of the switching circuit.

In this design, the switching circuit further includes a transistor. The first end and the second end of the triode are respectively connected with the relay and the grounding end, namely the triode and the relay are connected in series between the second power supply and the grounding end. When the on-off state of the switch circuit is controlled, the triode and the relay need to be controlled simultaneously. The control end of the triode is also connected to the controller, and the controller can directly control the on-off state of the triode and the control end of the triode.

When the switch circuit is in an abnormal opening state, the switch circuit needs to be controlled to be disconnected, and the controller sends an instruction for disconnecting the relay and the triode to ensure that the switch circuit is in a disconnection state. When the switch circuit is in an abnormal closing state, the switch circuit needs to be controlled to be conducted, and the controller sends an instruction for conducting the relay and the triode to ensure that the switch circuit is in a conducting state.

Through setting up the triode as the safety protection circuit, can avoid being in the unusual open mode because the switching circuit that the unable controlled disconnection of relay leads to, control triode disconnection when the unable controlled disconnection of relay, can make switching circuit be in the state of breaking circuit, realized the effect to power supply circuit's load safety protection.

Example four:

as shown in fig. 7, a fourth embodiment of the present invention provides a cooking apparatus 700 including: a load 702 and a power supply circuit 100.

The power supply circuit 100 is selected as the power supply circuit 100 in the first embodiment, and the power supply circuit 100 is connected to a load 702.

The load 702 is selected from a lighting device, an electric heating device, an electric motor, a microwave generating device, and the like.

The power supply circuit 100 can supply power to a plurality of loads 702, each load 702 is connected to the power supply circuit 100 through a second switch, each second switch is correspondingly provided with a first switch, a first diode, a first resistive element and a second resistive element, and each first switch is connected to different signal acquisition terminals of the controller. Therefore, the power supply circuit 100 can detect the on-off state of the second switch corresponding to the plurality of loads 702.

Example five:

as shown in fig. 8, a fifth embodiment of the present invention provides a cooking apparatus 800 including: a memory 802 and a processor 804.

The memory 802 has programs or instructions stored therein. The processor 804 executes a program or instructions stored in the memory 802 to implement the steps of the control method of the power supply circuit as any one of the possible designs of the second aspect described above.

Therefore, the control method of the power supply circuit in any one of the possible designs has all the beneficial technical effects, and is not described in detail herein.

Example six:

a sixth embodiment of the present invention provides a readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the control method of the power supply circuit as in the first embodiment.

It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings and described above. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.

It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.

In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power supply circuit, comprising:

a first power supply;

a switching circuit;

a sampling circuit, a first terminal of which is connected to the first power supply, a second terminal of which is grounded, a third terminal of which is connected to the switching circuit, and a fourth terminal of which is configured to output a level signal in response to an on-off state of the switching circuit;

and the controller is connected with the fourth end of the sampling circuit and used for determining the current on-off state of the switching circuit according to the level signal of the fourth end of the sampling circuit and controlling the switching circuit according to the current on-off state and the set on-off state.

2. The power supply circuit of claim 1, wherein the sampling circuit comprises:

a first end of the first switch element is connected with the first power supply, a second end of the first switch element is grounded, and a control end of the first switch element is connected with the switch circuit;

and a first resistive element, a first end of which is connected to the first power supply, and a second end of which is connected to the first switching element.

3. The power supply circuit of claim 2, wherein the sampling circuit further comprises:

a second resistive element, a first end of the second resistive element being connected to the controller;

and a first end of the first diode is connected with the second end of the second resistive element, a second end of the first diode is connected with the first end of the first switching element, and the first end to the second end of the first diode are conducted.

4. The power supply circuit according to any one of claims 1 to 3, wherein the switching circuit includes:

a second power supply;

and the first end of the second switch piece is connected with the second power supply, the second end of the second switch piece is connected with the fourth end of the sampling circuit, and the control end of the second switch piece is connected with the controller.

5. The power supply circuit of claim 4, wherein the switching circuit further comprises:

and a first end of the third switch is connected with a second end of the second switch, a second end of the third switch is grounded, and a control end of the third switch is connected with the controller.

6. The power supply circuit of claim 5, wherein the switching circuit further comprises:

and a first end of the second diode is connected with a first end of the second switching element, a second end of the second diode is connected with a second end of the second switching element, and the second end of the second diode is conducted to the first end.

7. The power supply circuit of claim 6, wherein the switching circuit further comprises:

and a first end of the third resistive element is connected with a first end of the third switching element, and a second end of the third resistive element is connected with a control end of the third switching element.

8. A control method of a power supply circuit for the power supply circuit according to any one of claims 1 to 7, characterized by comprising:

acquiring a set on-off state of the switch circuit;

determining the current on-off state of the switch circuit according to the level signal;

and controlling the switch circuit according to the current on-off state and the set on-off state.

9. The method for controlling the power supply circuit according to claim 8, wherein the step of controlling the switch circuit according to the current on-off state and the set on-off state specifically includes:

determining the running state of the switch circuit according to the current on-off state and the set on-off state;

controlling the switching circuit according to the operating state;

wherein the operating state comprises: a normal state, an abnormal on state, and an abnormal off state.

10. The method for controlling a power supply circuit according to claim 9, wherein the power supply circuit comprises: the step of determining the operating state of the switching circuit specifically includes:

determining that the switch circuit is in an abnormal opening state based on that the current on-off state is different from the set on-off state and the second switch piece is in a closed state;

and determining that the switch circuit is in an abnormal closing state based on that the current on-off state is different from the set on-off state and the third switch element is in an off state.

11. The method for controlling a power supply circuit according to claim 10, wherein the switch circuit further includes a third switch element, a first end of the third switch element is connected to a second end of the second switch element, a second end of the third switch element is grounded, a control end of the third switch element is connected to the controller, and the step of controlling the switch circuit according to the current on-off state and the set on-off state specifically includes:

controlling the second switching element and the third switching element to be turned off based on the switching circuit being in an abnormally-on state;

controlling the second and third switching pieces to be closed based on the switching circuit being in an abnormally closed state.

12. The method according to any one of claims 8 to 11, wherein the step of determining the current on-off state of the switch circuit according to the level signal specifically includes:

determining that the switching circuit is in an open state based on the level signal being a high level signal;

and determining that the switch circuit is in a combined state based on the fact that the level signal is a low level signal.

13. A cooking apparatus, characterized by comprising:

a load;

a supply circuit as claimed in any one of claims 1 to 7, connected to the load.

14. A cooking apparatus, characterized by comprising:

a memory having a program or instructions stored therein;

a processor executing a program or instructions stored in the memory to carry out the steps of the method of controlling a power supply circuit according to any one of claims 8 to 12.

15. A readable storage medium, characterized in that it stores thereon a program or instructions which, when executed by a processor, implement the steps of the control method of a power supply circuit according to any one of the preceding claims 8 to 12.