Control circuit and appliance

Abstract

This application discloses a control circuit and electrical appliance. The control circuit includes a first control module, a switch module, and a second control module. The switch module is connected in series in a first power supply path between the first control module and a power source. The switch module is used to turn the first power supply path on or off. When the first power supply path is on, the first control module powers on and outputs a first signal. When the first power supply path is off, the first control module is powered off, stops working, and stops outputting the first signal. The second control module is used to not output a target level signal to the switch module when it receives the first signal, and to output a target level signal to the switch module when it does not receive the first signal. This allows the switch module to automatically turn on the first power supply path without manual operation by the user when the first control module is powered off, achieving a self-starting function and improving the intelligence and ease of use of the control circuit.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, specifically to a control circuit and appliance. Background Technology

[0002] As electrical appliances have become increasingly common in homes and businesses, electrical control systems have gradually shifted from traditional mechanical systems to electronic control systems centered around controllers, thereby enabling more intelligent management.

[0003] However, in actual use, it has been found that if the controller of an appliance unexpectedly loses power, the user usually needs to manually power it back on, indicating a low level of intelligence. Utility Model Content

[0004] This application discloses a control circuit and electrical appliance. The control circuit can power on the first control module without manual operation by the user when the first control module is powered off, thereby improving the intelligence level of the control circuit and electrical appliance.

[0005] This application discloses a control circuit, including:

[0006] A first control module is connected to a power supply and is used to operate based on a first voltage provided by the power supply.

[0007] A switching module is connected in series in the first power supply path between the first control module and the power supply, and the switching module is used to turn on or off the first power supply path.

[0008] The first control module is further configured to power on and output a first signal when the first power supply path is turned on, and to power off and stop outputting the first signal when the first power supply path is turned off;

[0009] The second control module is connected to both the first control module and the switch module. The second control module is configured to not output the target level signal to the switch module when it receives the first signal, and to output the target level signal to the switch module when it does not receive the first signal. The target level signal is used to trigger the switch module to turn on the first power supply path.

[0010] In this embodiment, the control circuit includes a first control module, a switch module, and a second control module. The first control module is connected to a power supply, and the switch module is connected in series in a first power supply path between the first control module and the power supply. The switch module is used to turn the first power supply path on or off. When the first power supply path is on, the first control module operates based on a first voltage provided by the power supply and outputs a first signal. When the first power supply path is off, the first control module is powered off, stops operating, and stops outputting the first signal. The second control module is used to not output a target level signal to the switch module when it receives the first signal, and to output a target level signal to the switch module when it does not receive the first signal. By connecting the second control module to both the first control module and the switch module, the second control module will not receive the first signal when the first control module is powered off. This ensures the accuracy of the timing of the second control module sending the target level signal to the switch module. Furthermore, when the first control module is powered off, the switch module can be automatically triggered to turn on the first power supply path without manual user operation, achieving a self-starting function and improving the intelligence and ease of use of the control circuit.

[0011] In some embodiments, the control circuit further includes a drive circuit, which is connected to the first control module and the switch module respectively;

[0012] The first control module is also used to output a drive signal to the drive circuit when the power is on;

[0013] The driving circuit is used to output a target level signal to the switching module according to the driving signal, so as to maintain the switching module in the on state.

[0014] In this embodiment, the control circuit further includes a drive circuit, which is connected to both the first control module and the switch module. The first control module, when powered on, outputs a drive signal to the drive circuit. The drive circuit, based on the drive signal, outputs a target level signal to the switch module to maintain the switch module in a conducting state, thereby keeping the first control module powered on. This circuit structure allows the first control module to maintain the switch module in a conducting state when powered on, automatically keeping the first power supply path conducting. Compared to maintaining the first power supply path through other devices, this simplifies the power supply control circuit structure and prevents unexpected power outages to the first control module when other devices are interfered with, thus improving the reliability of the control circuit.

[0015] In some embodiments, the driving circuit includes:

[0016] A filtering unit, connected to the first control module, is used to smooth the driving signal to obtain a second voltage;

[0017] A first switch is connected to both the filtering unit and the switching module. The first switch is used to output a target level signal to the switching module based on the second voltage being in a conducting state.

[0018] In this embodiment, the driving circuit includes a filtering unit and a first switch. The filtering unit is connected to the first control module and the first switch, respectively. The first switch is also connected to the switch module. When the first control module outputs a driving signal, the filtering unit smooths the driving signal to provide a highly stable second voltage to the first switch, suppressing the influence of voltage fluctuations on the stability of the first switch and ensuring that the first switch can remain in the conducting state so that the switch module can stably receive the target level signal and improve the reliability of the power supply control of the control circuit.

[0019] In some embodiments, the target level signal is a low level signal, the switching module includes a P-type MOS transistor, the source of the P-type MOS transistor is connected to the power supply, the gate of the P-type MOS transistor is connected to the first terminal of the first switch, the second terminal of the first switch is connected to the ground terminal, and the third terminal of the first switch is connected to the filter unit.

[0020] When the first switch is in the ON state, the gate of the P-type MOS transistor is connected to the ground terminal through the first switch, and the P-type MOS transistor is in the ON state.

[0021] In this embodiment, the switching module includes a P-type MOSFET. The source of the P-type MOSFET is connected to the power supply, the gate of the P-type MOSFET is connected to the first terminal of the first switch, the second terminal of the first switch is connected to the ground terminal, and the third terminal of the first switch is connected to the filter unit. By controlling the on / off state of the first switch, the voltage of the gate of the P-type MOSFET can be controlled to be pulled down to a low level, thereby realizing the conduction or disconnection of the first power supply path. Compared with selecting an N-type MOSFET, the control circuit does not need to provide an additional voltage higher than the source voltage to pull up the gate voltage, making the circuit structure simple and reliable. At the same time, the P-type MOSFET is a voltage-driven device with low power consumption. Using the P-type MOSFET as the first switch can reduce the power consumption of the control circuit.

[0022] In some embodiments, the switching module further includes a first resistor, the first end of which is connected to the power supply and the source of the P-type MOS transistor, and the second end of which is connected to the gate of the P-type MOS transistor and the first end of the first switch.

[0023] The first resistor is used to pull up the voltage of the gate of the P-type MOS transistor to match the voltage of the source when the first switch is in the off state and the second control module does not output the target level signal to the switch module, and the P-type MOS transistor is in the off state.

[0024] In this embodiment, the switching module further includes a first resistor. The first end of the first resistor is connected to the power supply and the source of the P-type MOS transistor, respectively. The second end of the first resistor is connected to the gate of the P-type MOS transistor and the first switch, respectively. When the first switch is in the open state, the voltage at the gate of the P-type MOS transistor is close to the voltage at the source of the P-type MOS transistor, and the P-type MOS transistor is in the open state. This ensures that the P-type MOS transistor remains in the open state when there is no target level signal input, which is beneficial to improving the safety of the control circuit and reducing the power consumption of the control circuit.

[0025] In some embodiments, the first signal is a high-level signal, and the first control module includes:

[0026] A power supply pin is connected to the switching module, and the power supply pin is used to receive the first voltage provided by the power supply when the first power supply path is disconnected;

[0027] A communication pin is connected to the second control module. The communication pin is used to prevent the output of the high-level signal to the second control module when the power supply pin does not receive the first voltage.

[0028] In this embodiment, the first control module includes a power supply pin and a communication pin. The power supply pin is connected to the switch module, and the communication pin is connected to the second control module. When the first power supply path is disconnected, the power supply pin cannot receive the first voltage provided by the power supply, which accurately reflects that the first control module is in a power-off state. When the power supply pin VCC1 does not receive the first voltage, the communication pin does not output a high-level signal to the second control module, thereby enabling the second control module to output a target level signal in a timely manner so that the switch module can conduct the first power supply path, improving the response speed and accuracy of the control circuit's self-starting.

[0029] In some embodiments, the target level signal is a low level signal; the second control module includes:

[0030] The control pin is connected to the switch module.

[0031] The grounding pin is connected to the grounding terminal.

[0032] The second switch is connected to both the control pin and the ground pin.

[0033] When the second control module does not receive the first signal, the second switch is in the ON state, so that the control pin is connected to the ground pin through the second switch to output the low-level signal to the switch module.

[0034] In this embodiment, the second control module includes a control pin, a ground pin, and a second switch. The control pin is connected to the switch module, the ground pin is connected to a ground terminal, and the second switch is connected to both the control pin and the ground pin. When the second control module does not receive the first signal, the second switch is in a conducting state, causing the control pin to connect to the ground pin through the second switch. This structure enables the transmission of a low-level signal to the switch module through the ground pin and the second switch when the first control module is powered off, thus achieving a self-starting function.

[0035] In some embodiments, the second control module includes:

[0036] An auxiliary controller, connected to the first control module, is configured to not output a second signal when the first signal is received, and to output the second signal when the first signal is not received.

[0037] An isolation element is connected to both the auxiliary controller and the switching module. The isolation element is used to prevent the output of the target level signal to the switching module when the second signal is not received, and to output the target level signal to the switching module when the second signal is received.

[0038] In this embodiment, the second control module includes an auxiliary controller and an isolation element. The auxiliary controller is connected to the first control module and the isolation element respectively. When the first control module is powered off, the auxiliary controller can output a second signal to the isolation element, so as to output a target level signal to the switch module through the isolation element, thereby realizing the self-starting of the first control module, ensuring power supply continuity and timely response. At the same time, by setting the isolation element, electrical isolation between the auxiliary controller and the switch module can be achieved, avoiding signal interference from the switch module side to the auxiliary controller, and improving the safety and anti-interference capability of the control circuit.

[0039] In some embodiments, the control circuit further includes a load;

[0040] The switching module is also connected to the load, and the switching module is also used to connect or disconnect the second power supply path between the power source and the load. When the switching module is in the off state, both the first power supply path and the second power supply path are disconnected.

[0041] The second control module is further configured to output the target level signal to the switch module in response to the wake-up signal, the target level signal being used to trigger the switch module to turn on the first power supply path and the second power supply path.

[0042] In this embodiment, the control circuit also includes a load. The switching module can also be used to connect or disconnect the second power supply path between the power source and the load. When the switching module is in the off state, both the first and second power supply paths are disconnected, so that even if the power source provides the first voltage, neither the first control module nor the load consumes power, reducing the energy consumption of the control circuit. Simultaneously, the second control module is also used to respond to a wake-up signal by outputting a target level signal to the switching module, so that both the first and second power supply paths are connected, and both the first control module and the load are powered on, ensuring that the first control module and the load can be powered on and operate, thus improving the reliability of the control circuit.

[0043] This application discloses an electrical appliance, including any of the control circuits disclosed in this application. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is one of the schematic diagrams of a control circuit disclosed in an embodiment of this application;

[0046] Figure 2 This is a second schematic diagram of the structure of a control circuit disclosed in an embodiment of this application;

[0047] Figure 3 This is a schematic diagram of the structure of a driving circuit disclosed in an embodiment of this application;

[0048] Figure 4 This is a schematic diagram of another driving circuit disclosed in an embodiment of this application;

[0049] Figure 5 This is the third schematic diagram of a control circuit disclosed in the embodiments of this application;

[0050] Figure 6 This is the fourth schematic diagram of a control circuit disclosed in the embodiments of this application;

[0051] Figure 7 This is the fifth schematic diagram of a control circuit disclosed in the embodiments of this application;

[0052] Figure 8 This is the sixth schematic diagram of a control circuit disclosed in the embodiments of this application;

[0053] Figure 9 This is the seventh schematic diagram of a control circuit disclosed in the embodiments of this application;

[0054] Figure 10 This is the eighth schematic diagram of a control circuit disclosed in the embodiments of this application. Detailed Implementation

[0055] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0057] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0058] It is understood that in the following embodiments, "connection" should be interpreted as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., transmit electrical signals or data to each other. Meanwhile, in the following embodiments, "connection" can indicate either an indirect connection or a direct connection.

[0059] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0060] During their research on electrical appliances, the researchers of this application discovered that by setting a switch module in the appliance, the power supply path between the power source and the controller and load can be turned on or off, thereby improving the flexibility and safety of the appliance's power supply control to a certain extent.

[0061] However, in actual use, it has been found that when the appliance malfunctions (such as power supply voltage fluctuations or controller malfunctions), the switch module will switch to the open state. This switch module usually requires the user to manually perform a trigger operation to make the switch module close again so that the controller and load can be powered on again. The control circuit of the appliance has a low level of intelligence and low ease of use.

[0062] This application provides a control circuit and an electrical appliance. The control circuit can automatically control the switch module to be in a conducting state when the first control module is powered off, without requiring manual triggering by the user, and can also power on the first control module to achieve a self-starting function, thereby improving the intelligence level and ease of use of the control circuit of the electrical appliance.

[0063] Figure 1 This diagram illustrates one of the structural schematics of a control circuit provided in an embodiment of this application. The control circuit 110 may include a first control module 111, a switch module 112, and a second control module 113. The first control module 111 is connected to a power supply 120. The switch module 112 is connected in series in a first power supply path between the first control module 111 and the power supply 120. The second control module 113 is connected to both the first control module 111 and the switch module 112. The first control module 111 operates based on a first voltage provided by the power supply 120. The switch module 112 is used to turn the first power supply path on or off. The first control module 111 is also used to power on and output a first signal when the first power supply path is on, and to power off and stop outputting the first signal when the first power supply path is off. The second control module 113 is used to not output a target level signal to the switch module 112 when the first signal is received, and to output a target level signal to the switch module 112 when the first signal is not received.

[0064] The target level signal is used to trigger the switch module 112 to turn on the first power supply path. It should be noted that the first power supply path refers to the path between the first output terminal and the first control module 111. If the switch module 112 does not receive the target level signal, it disconnects the first power supply path. The on / off state of the switch module 112 can include an on state and an off state. When the switch module 112 is in the on state, the first power supply path is connected, the first control module 111 is powered on, and it outputs the first signal. When the switch module 112 is in the off state, the first power supply path is disconnected, the first control module 111 is powered off, and it cannot output the first signal.

[0065] Powering on the first control module 111 means that the first control module 111 receives the required operating voltage, and begins operation, enabling it to output a first signal to the second control module 113. Powering off the first control module 111 means that the first control module 111 cannot receive the required operating voltage, and therefore cannot operate or output the first signal to the second control module 113. The required operating voltage for the first control module 111 refers to the voltage necessary to maintain its normal operation.

[0066] It should be noted that the target level signal can be a low-level signal or a high-level signal. A low-level signal corresponds to a voltage less than or equal to a first voltage threshold, while a high-level signal corresponds to a voltage greater than the first voltage threshold. If the switch module 112 receives a high-level signal and activates the first power supply path, the target level signal is a high-level signal. If the switch module 112 receives a low-level signal and activates the first power supply path, the target level signal is a low-level signal.

[0067] The second control module 113 is connected to the first control module 111. When the first control module 111 is powered on, the second control module 113 can receive the first signal output by the first control module 111. When the first control module is powered off, the first control module 111 stops outputting the first signal, and the second control module 113 does not receive the first signal. In the absence of the first signal, the second control module 113 outputs a target level signal to the switch module 112 to trigger the switch module 112 to conduct the first power supply path. This allows the second control module 113 to output a target level signal to the switch module to trigger the switch module to conduct the first power supply path, thereby powering on the first control module 111, even when the first control module 111 is powered off.

[0068] In this embodiment, the second control module 113 is connected to both the switch module 112 and the first control module 111, so that the second control module 113 receives the first signal when the first control module 111 is powered on, and does not receive the first signal when the first control module is powered off. This ensures that the second control module 113 will only output the target level signal when the first control module 111 is powered off, thereby triggering the switch module to conduct the first power supply path and ensuring the accuracy of triggering the switch module to conduct the first power supply path.

[0069] Optionally, the first control module 111 may include an MCU (Microcontroller Unit), and the second control module 113 may include an MCU.

[0070] The power-on and power-off of the second control module 113 are unaffected by the on / off state of the first power supply path. In some embodiments, the first control module 111 is connected to the first output terminal of the power supply 120, and the second control module 113 is connected to the second output terminal of the power supply 120. The second control module 113 can be powered on when the switch module 112 disconnects the first power supply path, and the second control module 113 can also be powered on when the switch module 112 disconnects the first power supply path. It should be noted that the first output terminal of the power supply 120 can provide a first voltage, and the second output terminal of the power supply 120 can provide a third voltage. When the power supply 120 has a fourth voltage input, the power supply 120 can perform voltage conversion processing on the fourth voltage to obtain the first voltage and the third voltage, and output the first voltage through the first output terminal and the third voltage through the second output terminal.

[0071] Optionally, the fourth voltage can be an AC voltage, such as mains voltage, while the first and third voltages can be DC voltages. Optionally, the peak voltage corresponding to the fourth voltage is greater than the first voltage, and the first voltage is greater than or equal to the third voltage. In this embodiment, the power supply 120 can convert the AC voltage into the first and third voltages to power the first control module 111 and the second control module 113 respectively. The power-on and power-off of the first control module 111 and the second control module 113 are independent of each other.

[0072] In this embodiment, the on / off state of the switch module 112 affects the conduction and disconnection of the first power supply path, but does not affect the conduction and disconnection of the path between the second control module 113 and the second output terminal.

[0073] In some embodiments, the power supply 120 may include, but is not limited to, one or more of a rectifier module, a voltage conversion module, and a voltage regulator module. For example, the power supply 120 may include a rectifier module and a voltage conversion module connected to the rectifier module. The rectifier module can be used to input a fourth voltage. The first output terminal of the voltage conversion module is connected to a first control module 111, and the second output terminal of the voltage conversion module is connected to a second control module 113. A switch module 112 is connected in series in the path between the first output terminal and the first control module 111. The rectifier module can be used to rectify the fourth voltage to obtain a first DC voltage. The voltage conversion module can be used to step down the first DC voltage to obtain a first voltage and a third voltage, and output the first voltage through the first output terminal and the third voltage through the second output terminal.

[0074] In this embodiment, the control circuit 110 includes a first control module 111, a switch module 112, and a second control module 113. The first control module 111 is connected to the power supply 120. The switch module 112 is connected in series in the first power supply path between the first control module 111 and the power supply 120. The switch module 112 is used to turn on or off the first power supply path. When the first power supply path is on, the first control module 111 operates based on the first voltage provided by the power supply and outputs a first signal. When the first power supply path is off, the first control module 111 is de-energized, the first control module 111 stops working, and stops outputting the first signal. The second control module 113 is used to prevent the output of the target level signal to the switch module 112 when the first signal is received, and to output the target level signal to the switch module 112 when the first signal is not received. By connecting the second control module 113 to the first control module 111 and the switch module 112 respectively, the second control module 113 will not receive the first signal when the first control module 111 is powered off. This ensures the accuracy of the timing of the second control module 113 sending the target level signal to the switch module 112. In the event that the first control module 111 is powered off, the switch module 112 can be automatically triggered to conduct the first power supply path without manual operation by the user, thus realizing the self-start function and improving the intelligence and ease of use of the control circuit 110.

[0075] Figure 2 This is a second schematic diagram of a control circuit provided in an embodiment of this application. For example... Figure 2 As shown, the control circuit 210 may include a first control module 211, a switch module 212, a second control module 213, and a drive circuit 214. Figure 1The difference is that in this embodiment, the control circuit also includes a drive circuit 214, which is connected to the first control module 211 and the switch module 212 respectively. The first control module 211 is also used to output a drive signal to the drive circuit 214 when powered on. The drive circuit 214 is used to output a target level signal to the switch module 212 according to the drive signal, so as to keep the switch module 212 in the on state.

[0076] It should be noted that the target level signal can be a level signal generated by the drive circuit 214 based on the drive signal, or the drive circuit 214 can simply act as a transmission path to receive the target level signal and transmit the target level signal to the switch module 212.

[0077] In some embodiments, the switch module 212 is in an open state when an abnormal condition is met. Optionally, the abnormal condition may include, but is not limited to, at least one of the following: the first control module 211 malfunctions, or the state parameters of the control circuit deviate from the normal parameter range.

[0078] It should be noted that when the power supply 220 provides the first voltage and the switching module 212 is in the ON state (i.e., the first power supply path is open), if the first control module 211 malfunctions, it will be unable to output a drive signal, and the switching module 212 will switch from the ON state to the OFF state. In this embodiment, when the first control module 211 is powered on, it outputs a drive signal to the drive circuit 214 to maintain the switching module 212 in the ON state. When the first control module 211 malfunctions, it cannot maintain the output of the drive signal, allowing the switching module 212 to switch to the OFF state in a timely manner to disconnect the first power supply path. This prevents the first control module 211 from being powered on again when it malfunctions, thus avoiding damage to the first control module 211.

[0079] It should be noted that the status parameters may include, but are not limited to, at least one of temperature, voltage, and current. If the control circuit experiences overheating (temperature greater than or equal to the temperature threshold), overvoltage (voltage greater than or equal to the second voltage threshold), or overcurrent (current greater than or equal to the current threshold), the first control module 211 may actively stop outputting the drive signal to put the switch module 212 in the open state. Alternatively, the switch module 212 may be triggered to be in the open state in other ways to improve the safety of the control circuit.

[0080] In this embodiment, when abnormal conditions are met, the switch module 212 switches to the off state to achieve power failure protection. After power failure, the abnormal conditions may disappear, such as the first control module 211 disappearing abnormally and the status parameters returning to the normal parameter range. After the first control module 211 is powered off, the second control module 213 outputs a target level signal to the switch module 212 to trigger the switch module 212 to conduct the first power supply path. This not only reduces the probability of damage to the first control module 211, but also automatically restores the power supply to the first control module 211, enabling the control circuit to operate normally and improving the reliability of the control circuit. At the same time, it eliminates the need for manual operation by the user, improving ease of use.

[0081] In some embodiments, the drive signal may include one of a level signal and a PWM (Pulse Width Modulation) signal. It should be noted that the level signal may include both high-level and low-level signals. A PWM signal may refer to a signal composed of alternating high and low levels. When the first control module 211 is powered on, the first control module 211 may output a PWM signal. Optionally, the first control module 211 may include a PWM pin connected to the drive circuit 214, which can be used to output a PWM signal.

[0082] In this embodiment, the control circuit 210 further includes a drive circuit 214, which is connected to the first control module 211 and the switch module 212. The first control module 211 is also used to output a drive signal to the drive circuit 214 when powered on. The drive circuit 214 is used to output a target level signal to the switch module 212 according to the drive signal to maintain the switch module 212 in a conducting state, thereby maintaining the first control module 211 powered on. With this circuit structure, when the first control module 211 is powered on, the switch module 212 can be maintained in a conducting state by the first control module 211 and the drive circuit 214, realizing automatic maintenance of the first power supply path. Compared with maintaining the first power supply path through other devices, this simplifies the circuit structure of power supply control and avoids unexpected power failure of the first control module when other devices are interfered with, thus improving the working reliability of the control circuit 210.

[0083] Figure 3 A schematic diagram of a driving circuit provided in an embodiment of this application is shown. Figure 3As shown, the driving circuit 310 may include a filtering unit 311 and a first switch 312. The filtering unit 311 is connected to the first control module 320, and the first switch 312 is connected to both the filtering unit 311 and the switch module 330. The filtering unit 311 is used to smooth the driving signal to obtain a second voltage. The first switch 312 is used to output a target level signal to the switch module 330 based on the second voltage being in an on state.

[0084] It should be noted that the second voltage obtained through smoothing has a smaller fluctuation relative to the driving signal. The filtering unit 311 can make the second voltage supplied to the first switch 312 tend to be stable, that is, the difference between the second voltages corresponding to adjacent times is less than the third voltage threshold.

[0085] In some embodiments, the target level signal is a low-level signal. The first terminal of the first switch 312 is connected to the switch module 330, the second terminal of the first switch 312 is connected to the ground terminal, and the third terminal of the first switch 312 is connected to the filter unit 311. It should be noted that when the third terminal of the first switch 312 receives the second voltage, the first terminal and the second terminal of the first switch 312 are turned on, so that the switch module 330 obtains the low-level signal.

[0086] Figure 4 A schematic diagram of another driving circuit provided in an embodiment of this application is shown. Figure 4 As shown, the filtering unit may include a first capacitor C1. The first terminal of the first capacitor C1 is connected to the third terminal of the first control module 410 and the first switch 420, respectively. The second terminal of the first capacitor C1 is connected to the second terminal of the first switch 420 and the ground terminal GND, respectively. The first terminal of the first switch 420 is connected to the switch module 430. It should be noted that the first capacitor C1 can be charged and discharged based on a drive signal to provide a stable second voltage to the first switch 420.

[0087] Please continue to refer to this. Figure 4 In some embodiments, the filtering unit may further include a first diode D1, the cathode of which is connected to the first terminal of the first capacitor C1 and the third terminal of the first switch 420, and the anode of the first diode D1 is connected to the first control module 410. In this embodiment, by setting the first diode D1, the current generated during the charging and discharging process of the first capacitor C1 can be prevented from flowing back into the first control module 410, thereby improving the safety and reliability of the control circuit.

[0088] In some embodiments, the drive signal includes a PWM signal. Please refer to [link / reference needed]. Figure 4The driving circuit may further include a second capacitor C2. The first end of the second capacitor C2 is connected to the first control module 410, and the second end of the second capacitor C2 is connected to the positive terminal of the first diode D1. It should be noted that in the event of an abnormality in the first control module 410, the first control module 410 may output a high-level signal or a low-level signal, but it cannot maintain the PWM signal output. By setting the second capacitor C2 to prevent DC voltage from passing through, when the first control module 410 malfunctions, the first capacitor C1 cannot charge based on the high-level signal or the low-level signal, that is, it cannot maintain the supply of the second voltage to the first switch 420. The first switch 420 is in the open state, and the first control module 410 is de-energized. This avoids continuous power supply to the first control module 410 when it malfunctions, improving the safety of the control circuit.

[0089] In some embodiments, the driving circuit may further include a second resistor R2, with a first end connected to the first control module 410 and a second end connected to the third end of the first switch 420 and the first end of the first capacitor C1, respectively. The second resistor R2 can reduce the current supplied to the first switch 420.

[0090] In some embodiments, the switching module 430 may include a PNP transistor. The emitter of the PNP transistor is connected to the power supply, the base of the PNP transistor is connected to the first terminal of the first switch 420, the collector of the PNP transistor is connected to the first control module 410, the second terminal of the first switch 420 is connected to the ground terminal GND, and the third terminal of the first switch 420 is connected to the filter unit.

[0091] It should be noted that when the source voltage of a PNP transistor is greater than its base voltage, the PNP transistor is in the ON state. The first control module 410 outputs a drive signal, which is converted into a second voltage by the filter unit to turn on the first switch 420. This connects the base of the PNP transistor to the ground terminal GND through the first switch 420, pulling the base voltage of the PNP transistor down. When the base voltage is less than the source voltage, the PNP transistor is in the ON state.

[0092] In some embodiments, the switching module may include a P-type MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). The source of the P-type MOSFET is connected to a power supply, and the gate of the P-type MOSFET is connected to a driving circuit. The driving circuit is also connected to a first control module and a ground terminal. The driving circuit is further configured to, according to a driving signal, turn on the path between the gate of the P-type MOSFET and the ground terminal, so that the P-type MOSFET is in a conducting state. The driving circuit is also configured to, when no driving signal is received, turn off the path between the gate of the P-type MOSFET and the ground terminal, so that the P-type MOSFET is in a disconnected state.

[0093] Figure 5 This is shown as a third schematic diagram of a control circuit according to an embodiment of this application. In this embodiment, the target level signal is a low-level signal. Figure 5 As shown, the switching module may include a P-type MOSFET Q1. The source of the P-type MOSFET Q1 is connected to the power supply 510, the gate of the P-type MOSFET Q1 is connected to the first terminal of the first switch 521, the second terminal of the first switch 521 is connected to the ground terminal GND, and the third terminal of the first switch 521 is connected to the filter unit 522. When the first switch 521 is in the ON state, the gate of the P-type MOSFET Q1 is connected to the ground terminal GND through the first switch 521, and the P-type MOSFET Q1 is in the ON state.

[0094] The drain of the P-type MOSFET Q1 is connected to the first control module 523. It should be noted that the P-type MOSFET Q1 is in the ON state when the voltage difference corresponding to it is less than the fourth voltage threshold and the gate voltage is less than the source voltage. The fourth voltage threshold is negative, and the voltage difference corresponding to it is the difference between the gate voltage and the source voltage of the P-type MOSFET Q1. The gate of the P-type MOSFET Q1 is connected to ground via the first switch; when the gate voltage of the P-type MOSFET Q1 is pulled low, the P-type MOSFET Q1 is in the ON state.

[0095] In this embodiment, the source of the P-type MOSFET Q1 is connected to the power supply 510, resulting in a higher source voltage for Q1. Therefore, by controlling the on / off state of the first switch 521, the voltage at the gate of the P-type MOSFET Q1 is controlled to determine whether it is pulled down to a low level, thereby controlling the voltage difference between the gate voltage and the source voltage of Q1. If the gate of the P-type MOSFET Q1 is connected to ground (GND) through the first switch 521, Q1 is in the ON state; if the first switch 521 is in the OFF state, Q1 is in the OFF state.

[0096] In this embodiment, the switching module includes a P-type MOSFET Q1. The source of the P-type MOSFET Q1 is connected to the power supply 510, the gate of the P-type MOSFET Q1 is connected to the first terminal of the first switch 521, the second terminal of the first switch 521 is connected to the ground terminal GND, and the third terminal of the first switch 521 is connected to the filter unit 522. By controlling the on / off state of the first switch 521, the voltage of the gate of the P-type MOSFET Q1 can be controlled to be pulled down to a low level, thereby realizing the conduction or disconnection of the first power supply path. Compared with selecting an N-type MOSFET, the control circuit does not need to provide an additional voltage higher than the source voltage to pull up the gate voltage, making the circuit structure simple and reliable. At the same time, the P-type MOSFET Q1 is a voltage-driven device with low power consumption. Using the P-type MOSFET Q1 as the first switch 521 can reduce the power consumption of the control circuit.

[0097] In some embodiments, please refer to Figure 5 The switching module may further include a first resistor R1. The first end of the first resistor R1 is connected to the power supply 510 and the source of the P-type MOSFET Q1, respectively. The second end of the first resistor R1 is connected to the gate of the P-type MOSFET Q1 and the first end of the first switch 521, respectively. The first resistor R1 is used to pull up the voltage of the gate of the P-type MOSFET Q1 to match the voltage of the source of the P-type MOSFET Q1 when the first switch 521 is in the open state and the second control module 524 does not output a target level signal to the switching module.

[0098] It should be noted that the gate voltage of the P-type MOSFET Q1 is pulled up to match the source voltage of the P-type MOSFET Q1, that is, the gate voltage of the P-type MOSFET is the same as the source voltage of the P-type MOSFET Q1. When the difference between the gate voltage of the P-type MOSFET Q1 and the source voltage of the P-type MOSFET Q1 is greater than or equal to the fourth voltage threshold, the P-type MOSFET Q1 is in the off state.

[0099] With the first switch 521 in the ON state, the current supplied by the power supply 510 flows sequentially through the first resistor R1 and the first switch 521 into the ground terminal GND. A voltage difference is formed across the first resistor R1, and the P-type MOSFET Q1 is in the ON state.

[0100] In this embodiment, the switching module further includes a first resistor R1. The first end of the first resistor R1 is connected to the power supply 510 and the source of the P-type MOSFET Q1, respectively. The second end of the first resistor R1 is connected to the gate of the P-type MOSFET Q1 and the first switch 521, respectively. When the first switch 521 is in the open state, the voltage of the gate of the P-type MOSFET Q1 is close to the voltage of the source of the P-type MOSFET Q1, and the P-type MOSFET Q1 is in the open state. This ensures that the P-type MOSFET Q1 remains in the open state when there is no target level signal input, which is beneficial to improving the safety of the control circuit and reducing the power consumption of the control circuit.

[0101] Please continue to refer to this. Figure 5 The switching module may further include a third resistor R3. The first end of the third resistor R3 is connected to the second end of the first resistor R1 and the gate of the P-type MOSFET Q1. The second end of the third resistor R3 is connected to the first end of the second control module 524 and the first switch 521. It should be noted that placing the third resistor R3 between the second end of the first resistor R1 and the first end of the first switch 521 can reduce the current flowing through the first switch 521 and prevent the current flowing through the first switch 521 from being too large, thereby protecting the first switch 521.

[0102] It is understood that the switching module may also use other types of switching transistors, not limited to PNP transistors and P-type MOSFETs Q1. This embodiment does not make specific limitations on this.

[0103] Optionally, the first switch may include, but is not limited to, an NPN transistor and an N-type MOSFET. Specifically, the first switch includes an NPN transistor, with its first terminal being the collector of the NPN transistor, its second terminal being the emitter of the NPN transistor, and its third terminal being the base of the NPN transistor. Alternatively, the first switch may include an N-type MOSFET, with its first terminal being the drain of the N-type MOSFET, its second terminal being the source of the N-type MOSFET, and its third terminal being the gate of the N-type MOSFET.

[0104] Figure 6 The fourth schematic diagram shows a control circuit according to an embodiment of this application. Figure 6 As shown, the first switch includes an NPN transistor Q2. The control circuit also includes a fourth resistor R4 and a fifth resistor R5. The first end of the fourth resistor R4 is connected to the first end of the fifth resistor R5 and the base of the NPN transistor Q2. The second end of the fourth resistor R4 is connected to the emitter of the NPN transistor Q2 and the ground terminal GND. The second end of the fifth resistor R5 is connected to the filter unit.

[0105] In this embodiment, the fourth resistor R4 can pull down the base voltage of the NPN transistor Q2 when the first control module 610 does not output a drive signal, thereby keeping the NPN transistor Q2 in the off state and preventing false turn-on. The fifth resistor R5 can prevent the base current of the NPN transistor Q2 from being too large.

[0106] In this embodiment, the driving circuit includes a filtering unit and a first switch. The filtering unit is connected to the first control module and the first switch, respectively. The first switch is also connected to the switch module. When the first control module outputs a driving signal, the filtering unit smooths the driving signal to provide a highly stable second voltage to the first switch, suppressing the influence of voltage fluctuations on the stability of the first switch and ensuring that the first switch can remain in the conducting state so that the switch module can stably receive the target level signal and improve the reliability of the power supply control of the control circuit.

[0107] Figure 7 This is shown as the fifth schematic diagram of a control circuit provided in an embodiment of this application. The first signal is a high-level signal. For example... Figure 7 As shown, the first control module 711 includes a power supply pin VCC1 and a communication pin I01. The power supply pin VCC1 is used to stop receiving the first voltage provided by the power supply 720 when the first power supply path is disconnected. The communication pin I01 is also used to stop outputting a high-level signal to the second control module when the power supply pin VCC1 stops receiving the first voltage.

[0108] It should be noted that a high-level signal can refer to a voltage level signal whose corresponding voltage value is greater than the first voltage threshold. When a power supply path is disconnected, the power supply pin VCC1 cannot receive the first voltage. In this case, the communication pin I01 stops outputting a high-level signal. Since the second control module 712 does not receive a high-level signal, it outputs a target level signal to the switch module 713. When the first control module 711 is powered off, the second control module 712 outputs the target level signal to control the switch module 713 to be in a conducting state, thereby connecting the first power supply path. This allows the first control module 711 to be powered on again without user intervention after a power outage.

[0109] In some embodiments, the power supply pin VCC1 is connected to the switch module 713, and the communication pin I01 is connected to the second control module 712. The power supply pin VCC1 is used to receive a first voltage provided by the power supply 720 when the first power supply path is turned on. The communication pin I01 is used to output a high-level signal to the second control module 712 when the power supply pin VCC1 receives the first voltage.

[0110] It should be noted that the first control module 711 can output a high-level signal and stop output through software or hardware circuitry. In some embodiments, the first control module 711 may further include a sixth resistor, one end of which is connected to the power supply pin VCC1, and the other end of which is connected to the communication pin I01. It should be noted that when the power supply pin VCC1 receives a first voltage, the voltage value at the other end of the third resistor is greater than the first voltage threshold, enabling a reliable output of a high-level signal to the second control module 712. In this embodiment, the output of a high-level signal to the second control module 712 when the power supply pin VCC1 receives a first voltage can be achieved through hardware circuitry, simplifying the software settings of the control circuit. Furthermore, this hardware circuitry is simple and occupies little space.

[0111] Meanwhile, a sixth resistor is connected in series between the power supply pin VCC1 and the communication pin I01 to prevent excessive current between the power supply pin VCC1 and the communication pin I01, thereby improving the safety of the control circuit.

[0112] Understandably, when the first control module 711 is normally powered down, or when the control circuit is in a sleep state, the second control module 712 does not receive the first signal and does not output the target level signal to the switch module 713, in order to maintain the power-off state of the first control module 711. The sleep state refers to the state where the second control module 712 is powered on and the first control module 711 is powered off, which can reduce the energy consumption of the control circuit.

[0113] In this embodiment, the first control module 711 includes a power supply pin VCC1 and a communication pin I01. The power supply pin VCC1 is connected to the switch module 713, and the communication pin I01 is connected to the second control module 712. When the first power supply path is disconnected, the power supply pin VCC1 cannot receive the first voltage provided by the power supply 720, which accurately reflects that the first control module 711 is in a power-off state. When the power supply pin VCC1 does not receive the first voltage, the communication pin I01 does not output a high-level signal to the second control module 712, thereby enabling the second control module 712 to output a target level signal in a timely manner so that the switch module 713 can conduct the first power supply path, thus improving the response speed and accuracy of the control circuit's self-starting.

[0114] Figure 8 This is shown as a sixth schematic diagram of a control circuit according to an embodiment of this application. In this embodiment, the target level signal is a low-level signal. Figure 8As shown, the second control module 810 may include a control pin 811, a ground pin 812, and a second switch K2. The control pin 811 is connected to the switch module 820, the ground pin 812 is connected to the ground terminal GND, and the second switch K2 is connected to both the control pin 811 and the ground pin 812. When the second control module 810 does not receive the first signal, the second switch K2 is in a conducting state, causing the control pin 811 to be connected to the ground pin 812 through the second switch K2, thereby outputting a low-level signal to the switch module 820.

[0115] It should be noted that the second control module 810 may, upon receiving the first signal, not control the second switch K2 to be in the on state, that is, the second switch K2 to be in the off state, so as to disconnect the path between the control pin 811 and the ground terminal GND. When the first signal is not received, the second control module 810 may control the second switch K2 to be in the on state, so as to connect the path between the control pin 811 and the ground terminal GND, so as to output a low-level signal to the switch module 820.

[0116] Optionally, the second switch K2 may include, but is not limited to, electrically controlled switches such as transistors and MOSFETs. Specifically, it can be implemented using NPN transistors, N-channel enhancement-mode MOSFETs, etc. The control terminal of the electrically controlled switch receives a control signal to control the electrically controlled switch to be in an on or off state, thereby enabling the voltage of the control pin 811 to be pulled down to the voltage of the ground pin 812 when the second control module 810 does not receive the first signal, so as to output a low-level signal to the switch module 820.

[0117] Taking the second switch K2, which includes an N-type MOSFET, as an example, the collector of the N-type MOSFET is connected to the control pin 811, and the emitter of the N-type MOSFET is connected to the ground pin 812. The second control module 810 can provide a high-level signal to the base of the N-type MOSFET to make the N-type MOSFET conduct, so as to output the target level signal to the switch module 820.

[0118] In this embodiment, the second control module 810 includes a control pin 811, a ground pin 812, and a second switch K2. The control pin 811 is connected to the switch module 820, the ground pin 812 is connected to the ground terminal GND, and the second switch K2 is connected to both the control pin 811 and the ground pin 812. When the second control module 810 does not receive the first signal, the second switch K2 is in a conducting state, causing the control pin 811 to be connected to the ground pin 812 through the second switch K2, thereby outputting a low-level signal to the switch module 820. This structure enables the transmission of a low-level signal to the switch module 820 through the ground pin 812 and the second switch K2 when the first control module 830 is powered off, thus achieving a self-starting function.

[0119] In related technologies, the control circuit includes a controller and a load. When the control circuit is connected to an AC power source (such as mains power), the controller and the load are directly powered on, resulting in high power consumption.

[0120] Figure 9 The seventh schematic diagram shows the structure of a control circuit provided in an embodiment of this application. Figure 9 As shown, the control circuit may further include a load 910, and a switching module is also connected to the load 910. The switching module is also used to connect or disconnect a second power supply path between the power supply and the load 910. When the switching module is in the off state, both the first and second power supply paths are disconnected. The second control module 920 is also used to output a target level signal to the switching module in response to a wake-up signal.

[0121] The target level signal is used to trigger the switching module to turn on the first and second power supply paths. The operating states of the control circuit can include a stop state, a sleep state, and an operating state. When the control circuit is in the stop state, there is no AC voltage input to the power supply. When the control circuit is in the sleep state, there is an AC voltage input to the power supply, the second control module 920 is powered on, and the first control module 930 and the load 910 are powered off. When the control module is in the operating state, the second control module 920, the first control module 930, and the load 910 are all powered on.

[0122] It should be noted that the wake-up signal can be used to trigger the second control module 920 to output a target level signal to the switch, thereby powering on the first control module 930 and the load 910. When the power supply is AC voltage, if the switch module is in the off state, the first control module 930 and the load 910 are de-energized, meaning they do not consume power. It is understandable that the power consumption of the load 910 is typically greater than that of the second control module 920. Therefore, when an external voltage is applied, maintaining the switch module in the off state reduces the power consumption of the control circuit, thus saving power.

[0123] In some embodiments, the switching module may include a third switch and a fourth switch, wherein the third switch is used to connect or disconnect the first power supply path, and the fourth switch is used to connect or disconnect the second power supply path. It should be noted that in this embodiment, the on / off state of the third switch does not affect the on / off state of the second power supply path, and the on / off state of the fourth switch does not affect the on / off state of the first power supply path.

[0124] In other embodiments, both the first power supply path and the second power supply path include a common sub-path, meaning that both the load 910 and the first control module 930 obtain the first voltage provided by the power supply through the common sub-path. The switching module may include a sixth switch connected in series with the common path. The first voltage provided by the power supply is transmitted to the first control module 930 through the common sub-path and other sub-paths in the first power supply path besides the common sub-path. The third voltage provided by the power supply is transmitted to the load 910 through the common sub-path and other sub-paths in the second power supply path besides the common sub-path. Connecting the sixth switch in series with the common sub-path allows for the setting of a switching device (sixth switch), and the conduction and disconnection of the first and second power supply paths can be controlled by controlling the on / off state of this switching device.

[0125] Please continue to refer to this. Figure 9 The sixth switch may include a P-type MOSFET. Specifically, the source of the P-type MOSFET is connected to the power supply, the gate of the P-type MOSFET is connected to the first terminal of the first switch, and the drain of the P-type MOSFET is connected to the power supply pin VCC1 of the first control module 930.

[0126] In this embodiment, even if the power supply input is AC voltage, the first control module 930 and the load 910 are not powered on because the switch module is in the off state, which can greatly reduce the power consumption of the control circuit.

[0127] Optionally, the operating power of the second control module 920 is less than that of the first control module. For example, the third voltage V3 is less than the first voltage V1. In this embodiment, the second control module 920, with its lower power consumption, is selected to output a target level signal to the switching module in response to a wake-up signal, thereby powering on the first control module 930. This further reduces the power consumption of the control circuit compared to the first control module 930 being powered on when an AC voltage is input.

[0128] Optionally, the load may include, but is not limited to, a motor. For example, if the control circuit is applied to a washing machine, the motor may be used to drive the drum of the washing machine to rotate. If the control circuit is applied to an air conditioner, the motor may be a driver device for the compressor, and the motor may be used to compress the refrigerant to achieve cooling and / or heating functions.

[0129] Optionally, the first control module 930 can also be connected to the load 910 to control the operation of the load 910. For example, the first control module 930 can control the speed of the motor, etc.

[0130] In some embodiments, the control circuit may further include a display screen, which may be connected to a first output terminal of the power supply. When the power supply inputs an AC voltage, the first output terminal outputs a first voltage, powering on the display screen; the second output terminal outputs a third voltage, powering on the second control module 920. It should be noted that in this embodiment, the power-on and power-off of the display screen are not affected by the switching module. Even if the switching module is in the off state, the display screen can still be powered on when the power supply inputs an AC voltage.

[0131] Optionally, the display screen can also be used to generate a wake-up signal in response to a startup operation performed on the display screen, and the second control module 920 outputs a target level signal to the switch module in response to the wake-up signal.

[0132] In other embodiments, the control circuit may also include a button module, which sends a wake-up signal to the second control module 920 when the button module is triggered.

[0133] In this embodiment, the control circuit also includes a load 910. The switching module can also be used to turn on or off the second power supply path between the power source and the load. When the switching module is in the off state, both the first and second power supply paths are disconnected, so that even if the power source provides the first voltage, neither the first control module 930 nor the load 910 consumes power, reducing the energy consumption of the control circuit. Simultaneously, the second control module 920 is also used to output a target level signal to the switching module in response to a wake-up signal, so that both the first and second power supply paths are turned on, and both the first control module 930 and the load 910 are powered on, ensuring that the first control module 930 and the load 910 can be powered on and operate, thus improving the reliability of the control circuit.

[0134] It should be noted that the second control module 920 may include a communication pin. For ease of description, the communication pin of the second control module 920 will be referred to as the second communication pin IO2, and the communication pin of the first control module 930 will be referred to as the first communication pin IO1. The second communication pin IO2 is connected to the first communication pin IO1 to realize the transmission of the first signal. Taking the first signal as a high-level signal as an example, when the first communication pin IO1 outputs a high-level signal, the second control module 920 receives the high-level signal through the second communication pin IO2; when the first communication pin IO1 does not output a high-level signal, the second control module 920 does not receive the high-level signal.

[0135] For ease of description, the power supply pin of the first control module 930 is referred to as the first power supply pin VCC1, the ground pin of the first control module 930 is referred to as the first ground pin GND1, the power supply pin of the second control module 920 is referred to as the second power supply pin VCC2, and the ground pin of the second control module 920 is referred to as the second ground pin GND2. Optionally, the second power supply pin VCC2 is connected to the second output terminal of the power supply so that the second control module 920 is powered on when the power supply inputs AC voltage. The switching module is connected to the first output terminal of the power supply, the first power supply pin VCC1 of the first control module 930, and the load, respectively. When the power supply is connected to AC voltage and the switching module is in the on state, the first power supply pin VCC1 receives the first voltage provided by the power supply, the load 910 receives the first voltage provided by the power supply, and the first control module 930 and the load 910 are powered on. Optionally, both the first ground pin GND1 and the second ground pin GND2 are connected to the ground terminal GND.

[0136] by Figure 9 Taking the control circuit shown as an example, the operation of the control circuit will be explained:

[0137] ① After the control circuit is connected to mains power, the power supply can output a first voltage V1 and a third voltage V3. The third voltage V3 is used to power the second control module 920. The first voltage V1 is converted into a fifth voltage V1' through a P-type MOSFET Q1. This fifth voltage V1' is used to power the first control module 930 and the load 910. When the control circuit is connected to mains power, if the P-type MOSFET Q1 is in the off state, the second control module 920 is working, the first control module 930 and the load 910 are de-energized, the control circuit is in a sleep state, and the power consumption of the control circuit is low.

[0138] ②When the second control module 920 receives the wake-up signal, the second control module 920 sends a low-level signal through the control pin IO3, the P-type MOS transistor Q1 is turned on, the fifth voltage V1' is generated, the first control module 930 and the load 910 are powered on, the control circuit exits the sleep state and enters the working state.

[0139] Optionally, the second control module 920 may also include a third communication pin I04, through which the second control module 920 can receive a wake-up signal.

[0140] ③ When the first control module 930 is powered on and operating normally, it sends a PWM signal (such as a square wave signal) of a certain frequency through its PWM pin. This signal passes through the second capacitor C2 and the first diode D1, generating a stable DC voltage across the first capacitor C1. This keeps the NPN transistor Q2 in the ON state, while the collector voltage of the NPN transistor Q1 is low, keeping the P-type MOSFET in the ON state. The first control module 930 and the load 910 continuously receive the fifth voltage V1'. When the first control module 930 is powered on, it sends a first signal to the second control module 920 through its first communication pin IO1. Upon receiving the first signal through its second communication pin IO2, the second control module 920 removes the low-level signal output from its control pin IO3.

[0141] ④ When the first control module 930 malfunctions, the output of the PWM pin will also malfunction, causing the first capacitor C1 to fail to form a stable DC voltage, the PNP transistor Q2 to be in the off state, causing the P-type MOSFET Q1 to be in the off state, and the first control module 930 and the load 910 to be powered off and shut down.

[0142] ⑤ When the first control module 930 is powered off, the second control module 920 cannot receive the first signal. It outputs a low-level signal through the control pin IO3 to turn on the P-type MOSFET Q1 again, and the first control module 930 is powered on again, realizing the abnormal self-start function.

[0143] In this embodiment, a control circuit that can achieve low power consumption and has a self-starting function is provided, which improves the control reliability of the control circuit while reducing the power consumption of the control circuit.

[0144] Figure 10 This is shown as the eighth schematic diagram of a control circuit provided in an embodiment of this application. Figure 10 As shown, the second control module may include an auxiliary controller 1010 and an isolation element. The auxiliary controller 1010 is connected to the first control module 1020. The isolation element is connected to both the auxiliary controller 1010 and the switch module. The auxiliary controller 1010 is configured to not output a second signal when it receives a first signal, and to output a second signal when it does not receive the first signal. The isolation element is configured to not output a target level signal to the switch module when it does not receive the second signal, and to output a target level signal to the switch module when it receives the second signal.

[0145] It should be noted that the second signal can be used to trigger the isolation element to output a target level signal to the switching module. The second signal can be a high-level signal or a low-level signal. It is understood that if the isolation element receives a high-level signal and outputs the target level signal to the switching module, then the second signal is a high-level signal; if the isolation element receives a low-level signal and outputs the target level signal to the switching module, then the second signal is a low-level signal. The auxiliary controller 1010 may include an MCU.

[0146] Please continue to refer to this. Figure 10 In some embodiments, the isolation element may include an optocoupler E1, in which the positive terminal of the diode is connected to the control pin IO5 of the auxiliary controller, the negative terminal of the diode is connected to the ground terminal GND, the collector of the optocoupler E1 is connected to the gate of the P-type MOSFET Q1, and the emitter of the optocoupler E1 is connected to the ground terminal GND.

[0147] Please refer to the following for further explanation. Figure 10 The second signal is a high-level signal. If the control pin IO5 of the auxiliary controller outputs a high-level signal, the diode in optocoupler E1 is turned on, the path between the collector and emitter of optocoupler E1 is completed, the gate voltage of P-type MOSFET Q1 is pulled low, and P-type MOSFET Q1 is in the on state. If the control pin IO5 of the auxiliary controller stops outputting a high-level signal, the path between the collector and emitter of optocoupler E1 is broken, and P-type MOSFET Q1 is in the off state. In this embodiment, the control pin of the second control module is the collector of optocoupler E1.

[0148] It is understood that the above embodiment uses optocoupler E1 as an isolation element only as an example. Other devices can also be used to achieve electrical isolation between the auxiliary controller 1010 and the switching module. This embodiment does not limit this.

[0149] In this embodiment, the second control module includes an auxiliary controller 1010 and an isolation element. The auxiliary controller 1010 is connected to the first control module 1020 and the isolation element respectively. When the first control module 1020 is powered off, the auxiliary controller 1010 can output a second signal to the isolation element, so as to output a target level signal to the switch module through the isolation element, thereby realizing the self-start of the first control module 1020, ensuring power supply continuity and timely response. At the same time, by setting the isolation element, electrical isolation between the auxiliary controller 1010 and the switch module can be achieved, avoiding signal interference from the switch module side to the auxiliary controller 1010, and improving the safety and anti-interference capability of the control circuit.

[0150] In some embodiments, the electrical appliance may include any of the control circuits provided in the above embodiments. Optionally, the electrical appliance may include, but is not limited to, air conditioners, refrigerators, fans, washing machines, etc.

[0151] In this embodiment, when the first power supply path is disconnected, the first control module is powered off, stops working, and stops outputting the first signal. The second control module is used to prevent the output of the target level signal to the switch module when the first signal is received, and to output the target level signal to the switch module when the first signal is not received. By connecting the second control module to both the first control module and the switch module, the second control module will not receive the first signal when the first control module is powered off, ensuring the accuracy of the timing of the second control module sending the target level signal to the switch module. This allows the switch module to automatically trigger the first power supply path without manual operation when the first control module is powered off, achieving a self-starting function. This improves the intelligence and ease of use of the control circuit, thereby enhancing the overall intelligence of the appliance.

[0152] The control circuit also includes a load, and the switching module is also connected to the load. The switching module is also used to turn on or off the second power supply path between the power supply and the load. When the switching module is in the off state, both the first power supply path and the second power supply path are disconnected. The second control module is also used to output the target level signal to the switching module in response to the wake-up signal. The target level signal is used to trigger the switching module to turn on the first power supply path and the second power supply path.

[0153] In this embodiment, when the appliance is connected to mains power, the switch module can be in an off state, disconnecting the first and second power supply paths. This de-energizes the first control module and the load, meaning that when the appliance is connected to mains power, the first control module and the load do not consume power, the control circuit is in a sleep state, and the appliance's power consumption is low. Simultaneously, the second control module can also respond to a wake-up signal by outputting a target level signal to the switch module, causing the switch module to connect the first and second power supply paths, thus powering on the first control module and the load. This ensures the first control module and the load can operate normally and improves the control circuit's reliability.

[0154] In the description of this specification, references to terms such as "some embodiments," "other embodiments," and "ideal embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0155] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0156] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A control circuit, characterized in that, include: A first control module is connected to a power supply and is used to operate based on a first voltage provided by the power supply. A switching module is connected in series in the first power supply path between the first control module and the power supply, and the switching module is used to turn on or off the first power supply path. The first control module is further configured to power on and output a first signal when the first power supply path is turned on, and to power off and stop outputting the first signal when the first power supply path is turned off; The second control module is connected to both the first control module and the switch module. The second control module is configured to not output the target level signal to the switch module when it receives the first signal, and to output the target level signal to the switch module when it does not receive the first signal. The target level signal is used to trigger the switch module to turn on the first power supply path.

2. The control circuit according to claim 1, characterized in that, The control circuit further includes a drive circuit, which is connected to the first control module and the switch module respectively. The first control module is also used to output a drive signal to the drive circuit when the power is on; The driving circuit is used to output a target level signal to the switching module according to the driving signal, so as to maintain the switching module in the on state.

3. The control circuit according to claim 2, characterized in that, The driving circuit includes: A filtering unit, connected to the first control module, is used to smooth the driving signal to obtain a second voltage; A first switch is connected to both the filtering unit and the switching module. The first switch is used to output a target level signal to the switching module based on the second voltage being in a conducting state.

4. The control circuit according to claim 3, characterized in that, The target level signal is a low level signal. The switching module includes a P-type MOS transistor. The source of the P-type MOS transistor is connected to the power supply. The gate of the P-type MOS transistor is connected to the first terminal of the first switch. The second terminal of the first switch is connected to the ground terminal. The third terminal of the first switch is connected to the filter unit. When the first switch is in the ON state, the gate of the P-type MOS transistor is connected to the ground terminal through the first switch, and the P-type MOS transistor is in the ON state.

5. The control circuit according to claim 4, characterized in that, The switching module further includes a first resistor, the first end of which is connected to the power supply and the source of the P-type MOS transistor, and the second end of which is connected to the gate of the P-type MOS transistor and the first end of the first switch. The first resistor is used to pull up the voltage of the gate of the P-type MOS transistor to match the voltage of the source when the first switch is in the off state and the second control module does not output the target level signal to the switch module, and the P-type MOS transistor is in the off state.

6. The control circuit according to claim 1, characterized in that, The first signal is a high-level signal, and the first control module includes: A power supply pin is connected to the switching module, and the power supply pin is used to receive the first voltage provided by the power supply when the first power supply path is disconnected; A communication pin is connected to the second control module. The communication pin is used to prevent the output of the high-level signal to the second control module when the power supply pin does not receive the first voltage.

7. The control circuit according to claim 1, characterized in that, The target level signal is a low-level signal; the second control module includes: The control pin is connected to the switch module. The grounding pin is connected to the grounding terminal. The second switch is connected to both the control pin and the ground pin. When the second control module does not receive the first signal, the second switch is in the ON state, so that the control pin is connected to the ground pin through the second switch to output the low-level signal to the switch module.

8. The control circuit according to claim 1, characterized in that, The second control module includes: An auxiliary controller, connected to the first control module, is configured to not output a second signal when the first signal is received, and to output the second signal when the first signal is not received. An isolation element is connected to both the auxiliary controller and the switching module. The isolation element is used to prevent the output of the target level signal to the switching module when the second signal is not received, and to output the target level signal to the switching module when the second signal is received.

9. The control circuit according to claim 1, characterized in that, The control circuit also includes a load; The switching module is also connected to the load, and the switching module is also used to connect or disconnect the second power supply path between the power source and the load. When the switching module is in the off state, both the first power supply path and the second power supply path are disconnected. The second control module is further configured to output the target level signal to the switch module in response to the wake-up signal, the target level signal being used to trigger the switch module to turn on the first power supply path and the second power supply path.

10. An electrical appliance, characterized in that, Includes the control circuit as described in any one of claims 1 to 9.

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