Power supply circuit and control method thereof, power supply device and electrical appliance

Abstract

The application discloses a power supply circuit and a control method thereof, a power supply device and an electrical equipment, and relates to the technical field of power supply. The power supply circuit comprises an alternating current input end, a direct current bus, a rectifier circuit which is arranged in series between the alternating current input end and the direct current bus, a voltage doubling circuit which comprises a first capacitor and a second capacitor arranged in series, the voltage doubling circuit being arranged in parallel with an output end of the rectifier circuit, and the voltage doubling circuit being used for boosting direct current on the direct current bus, a first control switch which is arranged in series between the alternating current input end and an input end of the rectifier circuit, the first control switch being used for controlling the working state of the rectifier circuit, and a second control switch which is arranged in series between the alternating current input end and a common end of the first capacitor and the second capacitor, the second control switch being used for controlling the working state of the voltage doubling circuit. The application solves the problem that, when the input alternating current voltage is too high, the direct current bus voltage is too high, and other hardware is damaged.

Description

Technical Field

[0001] This invention relates to the technical field of power supplies, and more particularly to power supply circuits and their control methods, power supply devices, and electrical equipment. Background Technology

[0002] To meet the market demand for 110V power supplies for electrical equipment, these devices also need to use 110V power. Furthermore, to ensure compatibility with existing air conditioner inverter solutions, the electrical control circuit must boost the voltage in the power supply section to provide the necessary operating voltage for the load on the DC bus. However, if electrical equipment is mistakenly connected to 220V, or if power grid fluctuations cause excessively high input voltage during operation, the DC bus voltage can remain elevated for extended periods, potentially damaging hardware and even posing safety risks. Summary of the Invention

[0003] The main objective of this invention is to provide an invention title that aims to solve the problem of excessively high AC voltage leading to excessively high DC bus voltage, which damages other hardware.

[0004] To achieve the above objectives, the present invention provides a power supply circuit, the power supply circuit comprising:

[0005] AC input terminal, used for connecting to AC power;

[0006] DC bus, used to connect the load;

[0007] A rectifier circuit, the input terminal of which is connected to the AC input terminal, and the output terminal of the rectifier circuit is connected to the DC bus. The rectifier circuit is used to convert the AC power input to the AC input terminal into DC power and output it to the DC bus.

[0008] A voltage multiplier circuit includes a first capacitor and a second capacitor connected in series. The voltage multiplier circuit is connected in parallel with the output terminal of the rectifier circuit. The voltage multiplier circuit is used to boost the DC current on the DC bus.

[0009] A first control switch is connected in series between the AC input terminal and the input terminal of the rectifier circuit. The first control switch is used to control the operating state of the rectifier circuit.

[0010] The second control switch is connected in series between the AC input terminal and the common terminal of the first and second capacitors. The second control switch is used to control the operating state of the voltage multiplier circuit.

[0011] In one embodiment, the power supply circuit is applied in an electrical device, and the power supply circuit further includes:

[0012] A switch control circuit, wherein the detection terminal of the switch control circuit is connected to the DC bus, and the two control terminals of the switch control circuit are connected one-to-one with the controlled terminals of the first control switch and the second control switch;

[0013] The switch control circuit is used to detect the DC bus voltage and obtain the operating status of the electrical equipment, and switch the on / off state of the first control switch and the second control switch according to the current on / off state of the first control switch and the second control switch, the DC bus voltage and the operating status of the electrical equipment.

[0014] In one embodiment, the switch control circuit is specifically used for:

[0015] When the electrical equipment is detected to be in an on / off or restart state, and the DC bus voltage is less than or equal to the first preset bus voltage, the second control switch is controlled to close; and,

[0016] After the second control switch has been closed for a first preset time, the first control switch is controlled to close.

[0017] In one embodiment, the switch control circuit is further configured to:

[0018] When the power supply is detected to be in a powered-on or powered-off state, the second control switch is in a closed state, and the DC bus voltage is greater than the second preset bus voltage, the second control switch is controlled to open.

[0019] In one embodiment, the switch control circuit is further configured to:

[0020] When the electrical equipment is detected to be in normal working condition, the first switch and the second control switch are in the closed state, and the DC bus voltage is greater than the second preset bus voltage, the second control switch is controlled to open; and,

[0021] After the second control switch is disconnected for a second preset time, the first control switch is then disconnected.

[0022] In one embodiment, the switch control circuit is further configured to:

[0023] When the electrical device is detected to be in a powered-off state for a third preset time period, and the first switch and the second control switch are in a closed state, the first control switch is controlled to open; and...

[0024] After the first control switch is disconnected for a fourth preset time, the second control switch is disconnected.

[0025] In one embodiment, the power supply circuit further includes a current limiting element, which is connected in parallel with the first control switch.

[0026] The present invention also proposes a power supply device, which includes the power supply circuit described above.

[0027] The present invention also proposes an electrical device, which includes the power supply circuit described above;

[0028] And / or, including the power supply device as described above.

[0029] This invention also proposes a power supply circuit control method. The power supply circuit includes an AC input terminal, a DC bus, a rectifier circuit, a voltage multiplier circuit, a first control switch, and a second control switch. The rectifier circuit is connected in series between the DC buses. The voltage multiplier circuit includes a first capacitor and a second capacitor connected in series, and the voltage multiplier circuit is connected in parallel with the output terminal of the rectifier circuit. The first control switch is connected in series between the AC input terminal and the input terminal of the rectifier circuit. The second control switch is connected in series between the AC input terminal and the common terminal of the first and second capacitors. The power supply control method includes:

[0030] Detect the DC bus voltage and obtain the operating status of the electrical equipment;

[0031] The on / off states of the first and second control switches are switched according to the current on / off state of the first and second control switches, the DC bus voltage, and the operating state of the electrical equipment.

[0032] In one embodiment, the step of switching the on / off states of the first control switch and the second control switch based on the current on / off state of the first control switch and the second control switch, the DC bus voltage, and the operating state of the electrical equipment includes at least any one of the following:

[0033] When the electrical equipment is detected to be in the power-on state or power-off restart state, and the DC bus voltage is less than or equal to the first preset bus voltage, the second control switch is controlled to close.

[0034] After the second control switch has been closed for a first preset time, the first control switch is controlled to close.

[0035] When the second control switch is in the closed state and the DC bus voltage is greater than the second preset bus voltage, the second control switch is controlled to open.

[0036] When it is detected that the electrical equipment is in normal working condition, the first switch and the second control switch are in the closed state, and the DC bus voltage is greater than the second preset bus voltage, the second control switch is controlled to open.

[0037] After the second control switch is disconnected for a second preset time, the first control switch is disconnected.

[0038] When the electrical equipment is detected to be in a powered-off state and a third preset time period has been reached, and the first switch and the second control switch are in a closed state, the first control switch is controlled to open.

[0039] After the first control switch is disconnected for a fourth preset time, the second control switch is disconnected.

[0040] This invention controls the operating state of the voltage multiplier circuit by setting a second control switch. If the voltage connected to the AC input terminal is too high and does not conform to its voltage mode, or if the input voltage becomes too high due to power grid fluctuations during operation, the second control switch is disconnected, allowing the voltage multiplier circuit to cancel its multiplication. This invention solves the problem of excessively high AC input voltage leading to excessively high DC bus voltage, which can damage other hardware and extend the lifespan of electrical equipment. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the functional modules provided in one embodiment of the power supply circuit of the present invention;

[0044] Figure 2 This is a schematic diagram of the circuit structure provided for an embodiment of the power supply circuit of the present invention;

[0045] Figure 3 This is a flowchart illustrating an embodiment of the power supply circuit control method of the present invention.

[0046] Figure 4 This is a schematic diagram of the control logic for one embodiment of the two switches in the power supply circuit of the present invention;

[0047] Figure 5This is a schematic diagram of the control logic for another embodiment of the two switches in the power supply circuit of the present invention;

[0048] Figure 6 This is a schematic diagram of the device structure of the hardware operating environment involved in the power supply circuit control method in this embodiment of the invention.

[0049] Label:

[0050] Explanation of icon numbers:

[0051] 10. Rectifier circuit; 20. Voltage multiplier circuit; 30. First control switch; 40. Second control switch;

[0052] 50. Switch control circuit; C1, first capacitor; C2, second capacitor.

[0053] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0054] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of the present invention and are not intended to limit the present invention.

[0055] To better understand the technical solution of the present invention, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0056] Globally, different countries use different voltage modes. For example, China uses 220V, while Latin American countries use 115V. To adapt to different voltage modes, electrical appliances are configured to operate in a corresponding manner. For instance, when used with 115V, the load is set to operate in 115V mode; when used with 220V, the load is set to operate in 220V mode. This means that electrical appliances can only operate at around 115V. If a user accidentally connects to 220V, the appliance may be damaged.

[0057] Based on this, embodiments of the present invention provide a power supply circuit.

[0058] This power supply circuit can be applied to power supply devices, meaning the passive PFC circuit can be integrated independently with the power supply device as a single product to power other devices. The power supply circuit is particularly applicable to electrical appliances, such as refrigeration equipment, specifically air conditioners and refrigerators, and can also be applied to other electrical appliances with motors, such as washing machines. The following embodiments of the present invention use the application of the power supply circuit in an air conditioner as an example. This air conditioner can be a floor-standing air conditioner, wall-mounted unit, ceiling unit, window unit, kitchen air conditioner, or portable air conditioner, etc.

[0059] Reference Figure 1 In one embodiment of the present invention, the power supply circuit includes:

[0060] AC input terminal, used for connecting to AC power;

[0061] DC bus (BUS) is used to connect loads.

[0062] The rectifier circuit 10 has its input terminal connected to the AC input terminal AC and its output terminal connected to the DC bus BUS. The rectifier circuit 10 is used to convert the AC power input to the AC input terminal AC into DC power and output it to the DC bus BUS.

[0063] The voltage multiplier circuit 20 includes a first capacitor C1 and a second capacitor C2 connected in series. The voltage multiplier circuit 20 is connected in parallel with the output terminal of the rectifier circuit 10. The voltage multiplier circuit 20 is used to boost the DC power on the DC bus BUS.

[0064] The first control switch 30 is connected in series between the AC input terminal and the input terminal of the rectifier circuit 10. The first control switch 30 is used to control the working state of the rectifier circuit 10.

[0065] The second control switch 40 is connected in series between the AC input terminal AC and the common terminal of the first capacitor C1 and the second capacitor C2. The second control switch 40 is used to control the working state of the voltage multiplier circuit 20.

[0066] In this embodiment, the on / off states of the first control switch 30 and the second control switch 40 can be both in the closed state, both in the open state, or one in the closed state and the other in the open state. The on / off states of the first control switch 30 and the second control switch 40 can be summarized into the following four types, as shown in Table 1 below. Here, 0 indicates that the control switch is open and 1 indicates that the control switch is closed.

[0067] Table 1

[0068] state First control switch Second control switch 0 0 0 1 0 1 2 1 0 3 1 1

[0069] Optionally, the power supply circuit further includes a current-limiting element (PTC), which is connected in parallel with the first control switch 30. The PTC can be implemented using components with current-limiting characteristics such as inductors and resistors; in this embodiment, a resistor may be used. When the electrical equipment is powered on, the first control switch 30 is in the off state. The AC power input through the AC input terminal can be output to the rectifier circuit 10 via the PTC, so that the rectifier circuit 10 converts the input AC power into DC power and outputs it to the DC bus BUS. At this time, the PTC can suppress the current surge at the moment of power-on to prevent excessive current impact from damaging downstream circuits such as the bus voltage on the DC bus BUS and downstream loads. The DC bus BUS can also be connected to a switching power supply that supplies power to the main controller on the main control board of electrical equipment, etc., to power the main controller. In the initial stage of power-on, the main controller is powered by the power supply path consisting of the current limiting element PTC, rectifier circuit 10, DC bus BUS and switching power supply. After the main controller is powered by the switching power supply, after the electrical equipment is powered on for a certain period of time, such as 10s or 20s, the main controller 110 controls the first control switch 30 and the second control switch 40 to close sequentially at a certain time interval. This allows the AC power input at the power input terminal AC-in to be processed by the first control switch 30, the second control switch 40, rectifier circuit 10, voltage multiplier circuit 20, etc., and output DC power after voltage multiplication and rectification to the DC bus BUS.

[0070] In this embodiment, the AC input voltage can be 115V. The load connected to the DC bus can be a motor, specifically a compressor in an air conditioner, or a fan. Other power processing circuits, such as switching power supplies, can also be connected between the load and the DC bus. The switching power supply can provide power to the display board, circuits on the main board, and components in the electrical equipment.

[0071] The rectifier circuit 10 can be implemented using a rectifier bridge composed of discrete diodes, or it can be implemented using a rectifier bridge stack. The rectifier circuit 10 can also be implemented using other semiconductor devices with unidirectional conduction function, such as MOSFETs, IGBTs, and other switching transistors. In this embodiment, four discrete diodes can be used. The four diodes are denoted as diode D1, diode D2, diode D3, and diode D4. The anode of diode D1 is interconnected with the cathode of diode D2 and the live wire of the AC input terminal; the cathode of diode D1 is interconnected with the cathode of diode D3 and the positive terminal of the DC bus BUS; the anode of diode D3 is interconnected with the neutral wire of the AC input terminal and the anode of diode D4; and the anode of diode D2 is interconnected with the anode of diode D4 and the negative terminal of the DC bus BUS.

[0072] The voltage output of the voltage multiplier circuit 20 to the DC bus BUS is n times the input voltage at its input terminal, where n is a real number greater than 0. For example, when n = n1, the voltage multiplier circuit 20 is in n1 voltage multiplier rectification mode; or when n = n2, the voltage multiplier circuit 20 is in n2 voltage multiplier rectification mode, where n2 is greater than n1. The capacitance values ​​of the first capacitor C1 and the second capacitor C2 are set to be the same. The capacitors of the 115V passive voltage multiplier control can be implemented using two 200V capacitors. It is understandable that by setting the second control switch 40 to control the operating state of the voltage multiplier circuit 20, the voltage withstand requirements of the two capacitors in the voltage multiplier circuit 20 can be reduced, which is beneficial to reducing the design cost of the power supply circuit. Compared with the voltage withstand characteristics of the hardware, by controlling the opening of the second control switch 40 to change the operating state of the voltage multiplier circuit 20, the safety of electrical equipment is improved, and the standby power consumption of electrical equipment is minimized.

[0073] When the first control switch 30 is closed, AC power is supplied, energizing the rectifier circuit 10. When the first control switch 30 is open, the rectifier circuit 10 is de-energized. The second control switch 40 is connected to the common terminal of the first capacitor C1 and the second capacitor C2, controlling whether the voltage multiplier circuit 20 is in voltage multiplication mode or direct output mode. When the second control switch 40 is closed, either the first capacitor C1 or the second capacitor C2 stores energy and multiplies the voltage, making the voltage on the DC bus BUS equal to n times the voltage output by the rectifier circuit 10. When the second control switch 40 is open, the first capacitor C1 and the second capacitor C2 are connected in series, and the voltage on the DC bus BUS is equal to the voltage output by the rectifier circuit 10.

[0074] Optionally, when both the first control switch 30 and the second control switch 40 are closed, the alternating current is rectified by the diodes and charges either the first capacitor C1 or the second capacitor C2, forming a voltage multiplier rectification. During the positive half-cycle of the alternating current (L positive, N negative), the first diode D1 in the rectifier circuit 10 is turned on, while the second diode D2, the third diode D3, and the fourth diode D4 are turned off. The current flows through the first control switch 30, the first diode D1, the second control switch 40, and the first capacitor C1 to form a power supply loop, boosting the bus voltage. During the negative half-cycle of the alternating current, the second diode D2 is turned on, while the first diode D1, the third diode D3, and the fourth diode D4 are turned off. The current flows through the second control switch, the second capacitor C2, the second diode D2, and the first control switch 30 to form a power supply loop, boosting the bus voltage.

[0075] When the first control switch 30 is closed and the second control switch 40 is open, the alternating current, after being rectified by the diodes, charges the first capacitor C1 and the second capacitor C2, forming a bridge rectifier. During the positive half-cycle of the alternating current, the current flows through the first diode D1, the first capacitor C1, the second capacitor C2, the fourth diode D4, and the first control switch 30, forming a power supply circuit; as shown... Figure 4 As shown, during the negative half-cycle of the AC power, the current passes through the first control switch 30, the third diode D3, the first capacitor C1, the second capacitor C2, and the second diode D2, forming a power supply circuit.

[0076] This invention controls the operating state of the voltage multiplier circuit 20 by setting a second control switch 40. If the voltage connected to the AC input terminal is too high and does not conform to its voltage mode, or if the input voltage becomes too high due to power grid fluctuations during operation, the second control switch 40 is disconnected, allowing the voltage multiplier circuit 20 to cancel its voltage multiplication function. This invention solves the problem of excessively high AC input voltage leading to excessively high DC bus voltage and damage to other hardware, thus extending the lifespan of electrical equipment.

[0077] Reference Figure 1 and Figure 2 In one embodiment, the power supply circuit is applied in an electrical device, and the power supply circuit further includes:

[0078] A switch control circuit 50 is provided, wherein the detection terminal of the switch control circuit 50 is connected to the DC bus BUS, and the two control terminals of the switch control circuit 50 are connected one-to-one with the controlled terminals of the first control switch 30 and the second control switch 40.

[0079] The switch control circuit 50 is used to detect the DC bus voltage and obtain the operating status of the electrical equipment, and switch the on / off states of the first control switch 30 and the second control switch 40 according to the current on / off state of the first control switch 30 and the second control switch 40, the DC bus voltage and the operating status of the electrical equipment.

[0080] In this embodiment, the first control switch 30 and the second control switch 40 can be implemented using relays, contactors, or circuit breakers. In this embodiment, relays can be used. The switch control circuit 50 can be implemented using a main controller, switch drive circuit, etc. The main controller can be implemented using MCU (Micro Controller Unit), FPGA (Field Programmable Gate Array), PLC (Programmable Logic Controller), DSP (Digital Signal Processor), SOC (System on Chip), etc. When the power supply circuit is applied to an air conditioner, the main controller can also be the main controller of the entire unit. The main controller can communicate with external terminals through communication circuits, controlling the operation of loads such as the display panel, compressor, and fan while simultaneously controlling the operation of the power supply circuit. It is understandable that the main controller typically operates at 3.3V or 5V, while the relay's drive voltage is typically 12V. To drive the relay, the switch control circuit 50 also includes a switch drive circuit, i.e., a relay drive circuit, such as a transistor circuit or a relay driver IC. This relay drive circuit is connected in series between the main controller and the relay, allowing the main controller to control the relay drive circuit to activate the relay. In this embodiment, one end of the relay coil is connected to the drive power supply, and the other end is connected to the main controller via the relay drive circuit. The relay coil closes / opens upon receiving a control signal from the main controller. This allows for voltage multiplication through rectification when both relays are closed, and bridge rectification when the relay corresponding to the first control switch 30 is closed and the relay corresponding to the second control switch 40 is open.

[0081] Reference Figure 2 , Figure 4 and Figure 5 In one embodiment, the switch control circuit 50 is specifically used for:

[0082] When the electrical equipment is detected to be in an on / off or restart state, and the DC bus voltage is less than or equal to the first preset bus voltage, the second control switch 40 is controlled to close; and,

[0083] After the second control switch 40 is closed for a first preset time, the first control switch 30 is controlled to close.

[0084] In this embodiment, when the electrical equipment is off or in standby mode, the first control switch 30 and the second control switch 40 are in state 0 (both the first control switch 30 and the second control switch 40 are in the off state). In the power-on or shutdown / restart state, the air conditioner can start normally 2 seconds after power-on, rather than in the off mode. Alternatively, it can enter a preheating state. Specifically, this refers to the process of starting up at low temperatures for cooling or heating. Because the viscosity of the refrigerant and oil increases at low temperatures, flow is sluggish, and it usually takes a long time for the refrigerant to circulate throughout the system, resulting in slower cooling / heating performance of the indoor unit. Therefore, the compressor can be preheated first. Or, when testing the air conditioner, with the small board under load, the air conditioner starts its load devices, such as the compressor and fan, upon receiving a test signal. This process involves the operation of key components such as the power supply voltage rectification circuit 10 and the zero-crossing detection circuit. For example, power supply voltage rectification converts 115V AC power into safe DC power to supply the control board and other loads. The system detects the zero-crossing point of the AC power supply and controls the motor's starting timing to ensure it starts operating at the moment of alternating positive and negative AC current, thus optimizing motor startup and operation. After detecting the zero-crossing point, the control board sends a signal to the compressor, fan, and other load devices to initiate operation and complete the air conditioner's internal testing. At this time, the system determines whether to close the first control switch 30 and the second control switch 40 based on the DC bus voltage. This ensures the power circuit continues to operate in voltage multiplier rectification mode, preventing incorrect voltage connection. For example, if the rated voltage of an electrical device is 115V, incorrectly connecting it to a voltage higher than 115V, such as 145V or higher, could damage components. Specifically, a higher voltage like 220V could cause damage. The DC power rectified by the rectifier circuit 10 is further multiplied by the voltage multiplier circuit 20, resulting in an excessively high output voltage to the DC bus, damaging downstream components. Specifically, when the DC bus voltage is less than or equal to the first preset bus voltage, the second control switch 40 and the first control switch 30 can be controlled to close sequentially at certain time intervals. When the DC bus voltage exceeds the first preset bus voltage, the first control switch 30 and the second control switch 40 are kept open. Simultaneously, the power supply circuit can report a voltage abnormality fault to the main controller of the electrical equipment. The first preset bus voltage can be 205V (input voltage approximately 145V), and the first preset duration, i.e., the time interval between the closing of the two control switches, can be set to 2-5 seconds; in this embodiment, it can be selected as 3 seconds. The sequential closing of the two control switches at a certain time interval avoids the simultaneous operation of both control switches, which could lead to excessive voltage on the DC bus and affect subsequent circuits.In practical applications, if the DC bus voltage is less than or equal to 205V, both control switches switch to state 1 (second control switch 40 is closed, first control switch 30 is open). After the second control switch 40 is closed for 3 seconds, both control switches switch to state 3 (both the second control switch 40 and the first control switch 30 are closed). If the DC bus voltage is greater than 205V, a voltage abnormality fault is reported, and both control switches remain in state 0 (both the second control switch 40 and the first control switch 30 are open).

[0085] Understandably, to avoid frequent switching between closing and opening the control switch, which could damage the control switch, and to prevent excessive fluctuations in the DC bus voltage due to frequent closing and opening of the control switch, this embodiment detects the state of the first control switch 30 before closing the second control switch 40. For example, after determining that the first control switch 30 is open for a certain period of time, the second control switch 40 is closed, which can be 0.5 seconds. This embodiment can be used when electrical equipment can only use a voltage of around 115V. If the user uses the wrong voltage of 220V, the main control board will be damaged. After using the 115V passive voltage doubler dual control switch, the main control board will not be damaged when the user uses the wrong voltage of 220V by means of voltage judgment and control of the opening / closing of the control switch. When a high voltage is mistakenly connected, the second control switch 40 can be immediately disconnected to cancel the voltage doubler, extend the life of the electrical equipment, and immediately report the voltage abnormality fault.

[0086] Reference Figure 2 , Figure 4 and Figure 5 In one embodiment, the switch control circuit 50 is further configured to:

[0087] When the electrical equipment is detected to be in a powered-on or powered-off restart state, the second control switch 40 is in a closed state, and the DC bus voltage is greater than the second preset bus voltage, the second control switch 40 is controlled to open.

[0088] It should be noted that during the operation of electrical equipment, incorrect input voltage may occur, leading to excessively high bus voltage. Excessive bus voltage can damage downstream components of the DC bus. Therefore, when both control switches are in state 1 (second control switch 40 is closed, first control switch 30 is open), the detection of the DC bus voltage can be used to determine whether to close the first control switch 30 and open the second control switch 40. This ensures the power supply circuit continues to operate in voltage multiplier rectification mode, preventing voltage fluctuations in the connected AC power. For example, if grid voltage fluctuations cause the AC input voltage to reach 152V, this higher voltage, after being rectified by rectifier circuit 10, will be further multiplied by voltage multiplier circuit 20, resulting in excessively high output voltage to the DC bus, damaging downstream components. Specifically, when the DC bus voltage is less than or equal to the second preset bus voltage, the second control switch 40 and the first control switch 30 can be controlled to close sequentially at certain time intervals. When the DC bus voltage exceeds the second preset bus voltage, the first control switch 30 is maintained in its current state, and the second control switch 40 is opened. Simultaneously, the power supply circuit can report a voltage abnormality fault to the main controller of the electrical equipment. The second preset bus voltage can be 430V (input voltage approximately 152V). In practical applications, if the DC bus voltage exceeds 430V, both control switches switch to state 0 (both the second control switch 40 and the first control switch 30 are open), reporting a voltage abnormality fault and protecting the hardware. In this case, the power supply circuit does not perform voltage multiplication; only the rectifier circuit 10 performs rectification and outputs directly. This embodiment addresses the issue that during the operation of electrical equipment, when the mains voltage fluctuates and the AC input voltage is too high (bus voltage greater than 430V, input voltage approximately 152V), the motherboard's lifespan will be shortened, and prolonged exposure to excessively high voltage will damage the main control board. By using a 115V passive voltage doubler dual control switch, when excessively high input voltage occurs, the second control switch 40 can be immediately disconnected to cancel the voltage doubler, extending the lifespan of the electrical equipment. The equipment can then be restarted after ensuring the voltage is normal.

[0089] Reference Figure 2 , Figure 4 and Figure 5 In one embodiment, the switch control circuit 50 is further configured to:

[0090] When the electrical equipment is detected to be in normal working condition, the first switch and the second control switch 40 are in the closed state, and the DC bus voltage is greater than the second preset bus voltage, the second control switch 40 is controlled to open; and,

[0091] After the second control switch 40 is disconnected for a second preset time, the first control switch 30 is disconnected.

[0092] In this embodiment, when the electrical equipment is operating normally, both control switches are in state 3 (both the second control switch 40 and the first control switch 30 are closed). The system can also determine whether to disconnect the second control switch 40 based on the detected DC bus voltage. This is to determine whether the power supply circuit should continue operating in voltage multiplier rectification mode, preventing voltage fluctuations in the connected AC power. For example, if grid voltage fluctuations cause the AC input voltage to reach 152V, this higher voltage, after being rectified by the rectifier circuit 10, will be further multiplied by the voltage multiplier circuit 20, resulting in an excessively high output voltage to the DC bus, potentially damaging downstream components. Specifically, when the DC bus voltage is greater than the second preset bus voltage, the first control switch 30 is maintained in its current state, and the second control switch 40 is disconnected. The first control switch 30 is disconnected again after a preset time period following the disconnection of the second control switch 40. Simultaneously, the power supply circuit can also report a voltage abnormality fault to the main controller of the electrical equipment. The second preset bus voltage can be 430V (input voltage approximately 152V), and the second preset duration, i.e., the time interval between the sequential opening of the two control switches, can be set to 2-5 seconds. In this embodiment, 3 seconds can be selected. The sequential opening of the two control switches at a certain time interval can prevent the voltage on the DC bus BUS from becoming too high due to the simultaneous operation of the two control switches, which would affect the subsequent circuits. In practical applications, if the DC bus BUS voltage is greater than 430V, the two control switches are controlled to switch from state 3 to state 2 (the second control switch 40 is open and the first control switch 30 is closed). After the second preset duration, the two control switches are then controlled to switch from state 2 to state 0 (both the second control switch 40 and the first control switch 30 are open), and a voltage abnormality fault is reported to protect the hardware. At this time, the power supply circuit does not perform voltage multiplication; only the rectifier circuit 10 performs rectification and outputs directly. This embodiment addresses the issue that during the operation of electrical equipment, when the mains voltage fluctuates and the AC input voltage is too high (bus voltage greater than 430V, input voltage approximately 152V), the motherboard's lifespan will be shortened, and prolonged exposure to excessively high voltage will damage the main control board. By using a 115V passive voltage doubler dual control switch, when excessively high input voltage occurs, the second control switch 40 can be immediately disconnected to cancel the voltage doubler, extending the lifespan of the electrical equipment. The equipment can then be restarted after ensuring the voltage is normal.

[0093] Reference Figure 2 , Figure 4 and Figure 5 In one embodiment, the switch control circuit 50 is further configured to:

[0094] When the electrical device is detected to be in a powered-off state for a third preset time period, and the first switch and the second control switch 40 are in a closed state, the first control switch 30 is controlled to open; and...

[0095] After the first control switch 30 is disconnected for a fourth preset time, the second control switch 40 is disconnected.

[0096] In this embodiment, when the electrical equipment is running normally, both control switches are in state 3 (both the second control switch 40 and the first control switch 30 are in the closed state). During the shutdown process, within a third preset time period, the electrical equipment, such as the load in the air conditioner, such as the compressor and fan, continues to operate to complete any unfinished actions. Then, the first control switch 30 and the second control switch 40 can be controlled to turn on sequentially at certain time intervals. Specifically, timing begins when the shutdown command is received. When the third preset time period is reached, the two control switches switch from state 3 to state 1, that is, the first control switch 30 is controlled to turn off first. Since the second control switch 40 is still in the closed state, the AC power input at the AC input terminal can be output to the rectifier circuit 10 through the current limiting element PTC. The rectifier circuit 10 rectifies the AC power, and the voltage multiplier circuit 20 multiplies the voltage before outputting it to the DC bus BUS. The DC bus BUS voltage can provide power to the downstream switching power supply, load, etc., to provide the required electrical energy to the load working during the shutdown process. After the first control switch 30 is open for a certain period of time, i.e., after the fourth preset time, both control switches switch from state 1 to state 0, i.e., the second control switch 40 is then opened. At this time, only the rectifier circuit 10 works, without voltage multiplication. The rectifier circuit 10 converts the AC power input into DC power and outputs it to the DC bus BUS to power the control board and other loads that need to be in standby mode. The fourth preset time is set to avoid frequent switching between control switch opening and closing, which could damage the control switches. It also aims to prevent excessive voltage fluctuations on the DC bus BUS caused by frequent opening and closing of the control switches. In this embodiment, before opening the second control switch 40, the state of the first control switch 30 is detected. For example, after determining that the first control switch 30 is open for a certain period of time, the second control switch 40 is then opened. This time can be 0.5 seconds. In this embodiment, when the voltage is normal, the second control switch 40 is in the closed state, and if there are no abnormalities in the voltage, the second control switch 40 can remain in the closed state. To reduce standby power consumption, it is turned off when voltage multiplication is not needed in standby mode.

[0097] The present invention also proposes a power supply device, which includes the power supply circuit described above.

[0098] The power supply device provided by this invention, employing the power supply circuit in the above embodiments, can determine whether to perform voltage doubler rectification based on the input voltage. Compared with the prior art, the beneficial effects of the power supply device provided by this invention are the same as those of the power supply circuit provided in the above embodiments, and other technical features in the power supply device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0099] The present invention also proposes an electrical device, which includes the power supply circuit described above;

[0100] And / or, including the power supply device as described above.

[0101] The electrical device provided by this invention, employing the power supply circuit in the above embodiments, can determine whether to perform voltage doubler rectification based on the input voltage. Compared with the prior art, the beneficial effects of the electrical device provided by this invention are the same as those of the power supply circuit provided in the above embodiments, and other technical features in the electrical device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here. In this embodiment, the power supply device can be integrated into the electrical device or set up independently of the electrical device; no limitation is made here. The electrical device of this invention can be an air conditioner, washing machine, refrigerator, or other electrical device with a motor.

[0102] This invention also proposes a power supply control method for controlling a power supply circuit as described above. The power supply circuit includes an AC input terminal, a DC bus, a first control switch, and a second control switch. The rectifier circuit is connected in series between the DC bus. The voltage multiplier circuit includes a first capacitor and a second capacitor connected in series, and the voltage multiplier circuit is connected in parallel with the output terminal of the rectifier circuit. The first control switch is connected in series between the AC input terminal and the input terminal of the rectifier circuit. The second control switch is connected in series between the AC input terminal and the common terminal of the first and second capacitors.

[0103] Reference Figure 3 , Figure 4 and Figure 5 In one embodiment of the present invention, the power control method includes:

[0104] Step S100: Detect the DC bus voltage and obtain the operating status of the electrical equipment;

[0105] Step S200: Switch the on / off state of the first control switch and the second control switch according to the current on / off state of the first control switch and the second control switch, the DC bus voltage and the working state of the electrical equipment.

[0106] In this embodiment, the execution entity of the power control method can be a processor with data processing and program execution functions. When this control method is applied to electrical equipment, the execution entity can be the main controller of the electrical equipment. Both the processor and the main controller can switch the on / off states of the first and second control switches based on the current on / off state of the first and second control switches, the DC bus voltage, and the operating state of the electrical equipment. This is to prevent hardware damage caused by power grid fluctuations and excessively high input voltage during operation, which could result in prolonged high voltage. Additionally, the operating voltage of the electrical equipment is 115V; hardware damage can occur when the input voltage is 220V. The circuit connection and working principle of the rectifier circuit can be referred to in the above embodiment and will not be repeated here.

[0107] Optionally, the power supply circuit further includes a current-limiting element, which is connected in parallel with the first control switch. The current-limiting element can be implemented using components with current-limiting characteristics such as inductors and resistors; in this embodiment, a resistor may be used. When the electrical equipment is powered on, the first control switch is in the off state. The AC power input through the AC input terminal can be output to the rectifier circuit via the current-limiting element, so that the rectifier circuit converts the input AC power into DC power and outputs it to the DC bus. At this time, the current-limiting element can suppress the current surge at the moment of power-on to prevent excessive current impact from damaging downstream circuits, such as the bus voltage on the DC bus and downstream loads. The DC bus can also be connected to a switching power supply that supplies power to the main controller on the main control board of electrical equipment, so that the main controller is powered during the initial power-on stage. The power supply path consisting of current limiting element, rectifier circuit, DC bus and switching power supply supplies power to the main controller. After the main controller is powered by the switching power supply, after the electrical equipment is powered on for a certain period of time, such as 10s or 20s, the main controller 110 controls the first control switch and the second control switch to close sequentially at a certain time interval. This allows the AC power input at the power input terminal AC-in to be processed by the first control switch, the second control switch, rectifier circuit, voltage multiplier circuit, etc., and output DC power after voltage multiplication and rectification to the DC bus.

[0108] When the first control switch is closed, AC power is connected, energizing the rectifier circuit. When the first control switch is open, the rectifier circuit is de-energized. The second control switch is connected to the common terminal of the first and second capacitors, controlling whether the voltage multiplier circuit operates in voltage multiplication mode or direct output mode. When the second control switch is closed, either the first or second capacitor stores energy and multiplies the voltage, making the voltage on the DC bus equal to n times the output voltage of the rectifier circuit. When the second control switch is open, the first and second capacitors are connected in series, and the voltage on the DC bus is equal to the output voltage of the rectifier circuit. This invention, by setting the second control switch, disconnects the voltage multiplier circuit when the AC input voltage is too high and does not conform to its voltage mode, or when the grid voltage fluctuates and the input voltage is too high during operation. This allows the voltage multiplier circuit to cancel voltage multiplication, which helps extend the life of electrical equipment.

[0109] Reference Figure 3 , Figure 4 and Figure 5 In one embodiment of the present invention, the step of switching the on / off states of the first control switch and the second control switch according to the current on / off state of the first control switch and the second control switch, the DC bus voltage, and the operating state of the electrical equipment includes at least any one of the following:

[0110] When the electrical equipment is detected to be in the power-on state or power-off restart state, and the DC bus voltage is less than or equal to the first preset bus voltage, the second control switch is controlled to close.

[0111] After the second control switch has been closed for a first preset time, the first control switch is controlled to close.

[0112] In this embodiment, when the electrical equipment is off or in standby mode, the first and second control switches are in state 0 (both are in the off state). In the on-state or off-start state, the air conditioner starts normally 2 seconds after power-on, rather than in off mode. Alternatively, it may enter a preheating state. Specifically, this refers to the process of starting up at low temperatures for cooling or heating. Because the viscosity of the refrigerant and oil increases at low temperatures, flow is sluggish, and it usually takes a long time for the refrigerant to circulate throughout the system, resulting in slower cooling / heating performance of the indoor unit. Therefore, the compressor can be preheated. Or, when testing the air conditioner, with the small board under load, the air conditioner starts its load devices, such as the compressor and fan, upon receiving a test signal. This process involves the operation of key components such as the power supply voltage rectification circuit and the zero-crossing detection circuit. For example, power supply voltage rectification converts 115V AC power into safe DC power to supply the control board and other loads. The system detects the zero-crossing point of the AC power supply to control the motor's starting timing, ensuring the motor starts operating at the moment of alternating positive and negative AC current, thus optimizing motor startup and operation. After detecting the zero-crossing point, the control board sends a signal to the compressor, fan, and other load devices to initiate operation, completing the air conditioner's internal testing. At this time, the system determines whether to close the first and second control switches based on the DC bus voltage. This ensures the power circuit continues operating in voltage multiplier mode, preventing incorrect voltage connection. For example, if the rated voltage of an appliance is 115V, incorrectly connecting a voltage higher than 115V, such as 145V or other high voltages that could damage components (e.g., 220V), would cause the DC power, after rectification by the rectifier circuit, to be further multiplied by the voltage multiplier circuit, resulting in excessively high output voltage to the DC bus and damaging downstream components. Specifically, when the DC bus voltage is less than or equal to the first preset bus voltage, the second and first control switches can be controlled to close sequentially at certain time intervals. When the DC bus voltage is greater than the first preset bus voltage, the first and second control switches are kept open. Simultaneously, the power supply circuit can also report voltage abnormality faults to the main controller of the electrical equipment. The first preset bus voltage can be 205V (input voltage approximately 145V), and the first preset duration, i.e., the time interval between the sequential closing of the two control switches, can be set to 2-5 seconds. In this embodiment, 3 seconds can be selected. The sequential closing of the two control switches at a certain time interval can prevent the simultaneous operation of the two control switches from causing excessive voltage on the DC bus, which could affect subsequent circuits.In practical applications, if the DC bus voltage is less than or equal to 205V, the two control switches switch to state 1 (the second control switch is closed and the first control switch is open). After the second control switch is closed for 3 seconds, the two control switches switch to state 3 (both the second and first control switches are closed). If the DC bus voltage is greater than 205V, a voltage abnormality fault is reported, and the two control switches remain in state 0 (both the second and first control switches are open).

[0113] Understandably, to avoid frequent switching between closing and opening the control switch, which could damage the control switch, and to prevent excessive DC bus voltage fluctuations due to frequent closing and opening of the control switch, this embodiment detects the status of the first control switch before closing the second control switch. For example, after determining that the first control switch has been open for a certain period of time, the second control switch is closed, which can be 0.5 seconds. This embodiment can be used when electrical equipment can only use a voltage of around 115V. If the user uses the wrong voltage of 220V, the main control board will be damaged. After using a 115V passive voltage doubler dual control switch, the main control board will not be damaged when the user uses the wrong voltage of 220V by voltage judgment and control of the switch opening / closing. When a high voltage is mistakenly connected, the second control switch can be immediately disconnected to cancel the voltage doubler, extend the life of the electrical equipment, and report the voltage abnormality fault immediately.

[0114] When the electrical equipment is detected to be in the power-on state or in the shutdown and restart state, the second control switch is closed, and the DC bus voltage is greater than the second preset bus voltage, the second control switch is controlled to open.

[0115] It should be noted that during the operation of electrical equipment, incorrect input voltage may occur, leading to excessively high bus voltage. Excessive bus voltage can damage downstream components of the DC bus. Therefore, when both control switches are in state 1 (the second control switch is closed, and the first control switch is open), the detected DC bus voltage can be used to determine whether to close the first control switch and open the second control switch. This ensures the power circuit continues to operate in voltage doubler rectification mode, preventing voltage fluctuations in the connected AC power. For example, if grid voltage fluctuations cause the AC input voltage to reach 152V, this higher voltage, after being rectified by the rectifier circuit, will be further doubled by the voltage doubler circuit, resulting in excessively high output voltage to the DC bus, damaging downstream components. Specifically, when the DC bus voltage is less than or equal to the second preset bus voltage, the second and first control switches can be controlled to close sequentially at certain time intervals. When the DC bus voltage is greater than the second preset bus voltage (or when a high-voltage protection command is received), the first control switch is maintained in its current state, and the second control switch is opened. Simultaneously, the power supply circuit can also report voltage abnormality faults to the main controller of the electrical equipment. The second preset bus voltage can be 430V (input voltage approximately 152V). In practical applications, if the DC bus voltage exceeds 430V, both control switches switch to state 0 (both the second and first control switches are open), reporting a voltage abnormality fault and protecting the hardware. In this case, the power supply circuit does not perform voltage multiplication; only the rectifier circuit performs rectification and outputs directly. This embodiment addresses the issue that during the operation of the electrical equipment, when the mains voltage fluctuates and the AC input voltage becomes too high (bus voltage exceeding 430V, input voltage approximately 152V), the motherboard's lifespan will be shortened, and prolonged exposure to excessively high voltage will damage the main control board. By using a 115V passive voltage multiplier dual control switch, when an excessively high input voltage occurs, the second control switch can be immediately disconnected to cancel voltage multiplication, extending the lifespan of the electrical equipment. The equipment can then be restarted after ensuring the voltage is normal.

[0116] When it is detected that the electrical equipment is in normal working condition, the first switch and the second control switch are in the closed state, and the DC bus voltage is greater than the second preset bus voltage, the second control switch is controlled to open.

[0117] After the second control switch is disconnected for a second preset time, the first control switch is disconnected.

[0118] In this embodiment, when the electrical equipment is operating normally, with both control switches in state 3 (both the second and first control switches are closed), the system can determine whether to disconnect the second control switch based on the detected DC bus voltage. This is to determine whether the power supply circuit should continue operating in voltage multiplier rectification mode, preventing voltage fluctuations in the connected AC power. For example, if grid voltage fluctuations cause the AC input voltage to reach 152V, this higher voltage, after being rectified by the rectifier circuit, will be further multiplied by the voltage multiplier circuit, leading to excessively high output voltage to the DC bus and damaging downstream components. Specifically, when the DC bus voltage is greater than the second preset bus voltage (or when a high-voltage protection command is received), the first control switch is maintained in its current state, and the second control switch is disconnected. The first control switch is then disconnected after a preset time period of disconnection. Simultaneously, the power supply circuit can also report a voltage abnormality fault to the main controller of the electrical equipment. The second preset bus voltage can be 430V (input voltage approximately 152V), and the second preset duration, i.e., the time interval between the sequential opening of the two control switches, can be set to 2-5 seconds. In this embodiment, 3 seconds can be selected. The sequential opening of the two control switches at a certain time interval can prevent the voltage on the DC bus from becoming too high due to the simultaneous operation of the two control switches, which would affect the subsequent circuits. In practical applications, if the DC bus voltage is greater than 430V, the two control switches are controlled to switch from state 3 to state 2 (the second control switch is open and the first control switch is closed). After the second preset duration, the two control switches are then controlled to switch from state 2 to state 0 (both the second and first control switches are open), and a voltage abnormality fault is reported to protect the hardware. At this time, the power supply circuit does not perform voltage multiplication; only the rectifier circuit performs rectification and outputs directly. This embodiment addresses the issue that during the operation of electrical equipment, when the mains voltage fluctuates and the AC input voltage becomes excessively high (bus voltage exceeding 430V, input voltage approximately 152V), the mainboard's lifespan will be shortened, and prolonged exposure to excessively high voltage will damage the main control board. By using a 115V passive voltage doubler dual control switch, when excessively high input voltage occurs, the second control switch can be immediately disconnected to cancel the voltage doubler, extending the lifespan of the electrical equipment. The equipment can then be restarted only after ensuring the voltage is normal.

[0119] When the electrical equipment is detected to be in a powered-off state and a third preset time period has been reached, and the first switch and the second control switch are in a closed state, the first control switch is controlled to open.

[0120] After the first control switch is disconnected for a fourth preset time, the second control switch is disconnected.

[0121] In this embodiment, when the electrical equipment is running normally, both control switches are in state 3 (both the second and first control switches are closed). During the shutdown process, within a third preset time period, the electrical equipment, such as the load in the air conditioner, including the compressor and fan, continues to operate to complete any unfinished actions. Then, the first and second control switches can be controlled to turn on sequentially at certain time intervals. Specifically, timing begins when a shutdown command is received. When the third preset time period is reached, the two control switches switch from state 3 to state 1, meaning the first control switch is turned off first. Since the second control switch remains closed, the AC power input can be output to the rectifier circuit through a current-limiting element. The rectifier circuit rectifies the AC power, and the voltage multiplier circuit multiplies it before outputting it to the DC bus. The DC bus voltage can then provide power to the downstream switching power supply, load, etc., to provide the necessary electrical energy to the load operating during the shutdown process. After the first control switch is open for a certain period of time, i.e., after the fourth preset time, both control switches switch from state 1 to state 0, i.e., the second control switch is then opened. At this time, only the rectifier circuit works, without voltage multiplication. The rectifier circuit converts the AC power input into DC power and outputs it to the DC bus to power the control board and other loads that need to operate in standby mode. The fourth preset time is set to avoid frequent switching between control switch opening and closing, which could damage the control switches. It also aims to prevent excessive DC bus voltage fluctuations caused by frequent opening and closing of the control switches. In this embodiment, the state of the first control switch is detected before the second control switch is opened. For example, the second control switch is opened only after the first control switch has been open for a certain period of time, which can be 0.5 seconds. In this embodiment, the second control switch is in the closed state when the voltage is normal, and it can remain closed if there are no voltage abnormalities. To reduce standby power consumption, it is turned off when voltage multiplication is not needed in standby mode.

[0122] The following is for reference. Figure 6 The diagram illustrates a power controller suitable for implementing embodiments of the present invention. The power controller in these embodiments may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 6 The power controller shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments of the present invention.

[0123] like Figure 6 As shown, the power controller may include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.) that can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the power controller. The processing device 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. Communication device 1009 allows the power controller to communicate wirelessly or wiredly with other devices to exchange data. While the figure shows a power controller with various systems, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0124] In particular, according to the embodiments disclosed in this invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this invention.

[0125] It should be understood that the various parts disclosed in this invention can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0126] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

[0127] The present invention provides a computer-readable storage medium having computer-readable program instructions (i.e., computer programs) stored thereon, the computer-readable program instructions being used to execute the power control method in the above embodiments.

[0128] The computer-readable storage medium provided by this invention may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0129] The aforementioned computer-readable storage medium may be included in the power controller; or it may exist independently and not assembled into the power controller.

[0130] The aforementioned computer-readable storage medium carries one or more programs, which, when executed by an electrical device, cause the power controller to implement the aforementioned power control method.

[0131] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. These programming languages ​​include object-oriented programming languages—such as Java, Smalltalk, and C++—and conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0132] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0133] The modules described in the embodiments of the present invention can be implemented in software or hardware. The names of the modules do not necessarily limit the specific unit itself.

[0134] The readable storage medium provided by this invention is a computer-readable storage medium, which stores computer-readable program instructions (i.e., a computer program) for executing the above-described power control method, and is capable of adjusting the operating state of the voltage multiplier circuit according to the input voltage. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by this invention are the same as the beneficial effects of the power control method provided in the above embodiments, and will not be repeated here.

[0135] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the power control method described above.

[0136] The computer program product provided by this invention can adjust the operating state of the voltage multiplier circuit according to the input voltage. Compared with the prior art, the beneficial effects of the computer program product provided by this invention are the same as those of the power control method provided in the above embodiments, and will not be repeated here.

[0137] The above description is only a part of the embodiments of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes: AC input terminal, used for connecting to AC power; DC bus, used to connect the load; A rectifier circuit, the input terminal of which is connected to the AC input terminal, and the output terminal of the rectifier circuit is connected to the DC bus. The rectifier circuit is used to convert the AC power input to the AC input terminal into DC power and output it to the DC bus. A voltage multiplier circuit includes a first capacitor and a second capacitor connected in series. The voltage multiplier circuit is connected in parallel with the output terminal of the rectifier circuit. The voltage multiplier circuit is used to boost the DC current on the DC bus. A first control switch is connected in series between the AC input terminal and the input terminal of the rectifier circuit. The first control switch is used to control the operating state of the rectifier circuit. The second control switch is connected in series between the AC input terminal and the common terminal of the first and second capacitors. The second control switch is used to control the operating state of the voltage multiplier circuit.

2. The power supply circuit as described in claim 1, characterized in that, The power supply circuit is used in electrical equipment, and the power supply circuit further includes: A switch control circuit, wherein the detection terminal of the switch control circuit is connected to the DC bus, and the two control terminals of the switch control circuit are connected one-to-one with the controlled terminals of the first control switch and the second control switch; The switch control circuit is used to detect the DC bus voltage and obtain the operating status of the electrical equipment, and switch the on / off state of the first control switch and the second control switch according to the current on / off state of the first control switch and the second control switch, the DC bus voltage and the operating status of the electrical equipment.

3. The power supply circuit as described in claim 2, characterized in that, The switch control circuit is specifically used for: When the electrical equipment is detected to be in an on / off or restart state, and the DC bus voltage is less than or equal to the first preset bus voltage, the second control switch is controlled to close; and, After the second control switch has been closed for a first preset time, the first control switch is controlled to close.

4. The power supply circuit as described in claim 2, characterized in that, The switch control circuit is also used for: When the power supply is detected to be in a powered-on or powered-off state, the second control switch is in a closed state, and the DC bus voltage is greater than the second preset bus voltage, the second control switch is controlled to open.

5. The power supply circuit as described in claim 2, characterized in that, The switch control circuit is also used for: When the electrical equipment is detected to be in normal working condition, the first switch and the second control switch are in the closed state, and the DC bus voltage is greater than the second preset bus voltage, the second control switch is controlled to open; and, After the second control switch is disconnected for a second preset time, the first control switch is then disconnected.

6. The power supply circuit as described in claim 2, characterized in that, The switch control circuit is also used for: When the electrical device is detected to be in a powered-off state for a third preset time period, and the first switch and the second control switch are in a closed state, the first control switch is controlled to open; and... After the first control switch is disconnected for a fourth preset time, the second control switch is disconnected.

7. The power supply circuit according to any one of claims 1-6, characterized in that, The power supply circuit also includes a current limiting element, which is connected in parallel with the first control switch.

8. A power supply device, characterized in that, The power supply device includes the power supply circuit as described in any one of claims 1 to 7.

9. An electrical appliance, characterized in that, The electrical equipment includes the power supply circuit as described in any one of claims 1 to 7; And / or, including the power supply device as described in claim 8.

10. A power supply circuit control method, characterized in that, The power supply circuit includes an AC input terminal, a DC bus, a rectifier circuit, a voltage multiplier circuit, a first control switch, and a second control switch; wherein, the rectifier circuit is connected in series between the DC buses; the voltage multiplier circuit includes a first capacitor and a second capacitor connected in series, and the voltage multiplier circuit is connected in parallel with the output terminal of the rectifier circuit; the first control switch is connected in series between the AC input terminal and the input terminal of the rectifier circuit; the second control switch is connected in series between the AC input terminal and the common terminal of the first and second capacitors; the power supply control method includes: Detect the DC bus voltage and obtain the operating status of the electrical equipment; The on / off states of the first and second control switches are switched according to the current on / off state of the first and second control switches, the DC bus voltage, and the operating state of the electrical equipment.

11. The power control method as described in claim 10, characterized in that, The step of switching the on / off states of the first control switch and the second control switch based on the current on / off state of the first control switch and the second control switch, the DC bus voltage, and the operating state of the electrical equipment includes at least one of the following: When the electrical equipment is detected to be in the power-on state or power-off restart state, and the DC bus voltage is less than or equal to the first preset bus voltage, the second control switch is controlled to close. After the second control switch has been closed for a first preset time, the first control switch is controlled to close. When the second control switch is in the closed state and the DC bus voltage is greater than the second preset bus voltage, the second control switch is controlled to open. When it is detected that the electrical equipment is in normal working condition, the first switch and the second control switch are in the closed state, and the DC bus voltage is greater than the second preset bus voltage, the second control switch is controlled to open. After the second control switch is disconnected for a second preset time, the first control switch is disconnected. When the electrical equipment is detected to be in a powered-off state and a third preset time period has been reached, and the first switch and the second control switch are in a closed state, the first control switch is controlled to open. After the first control switch is disconnected for a fourth preset time, the second control switch is disconnected.

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