Mains conversion circuit, method, apparatus and storage medium

Abstract

The application relates to a commercial power conversion circuit, method, device and storage medium. The commercial power conversion circuit comprises a rectifier circuit, a control circuit and an open circuit; an input end of the rectifier circuit is used for being connected with a commercial power grid, and an output end is connected with a first end of the open circuit; a second end of the open circuit is used for being connected with an electronic device, and a control end is connected with the control circuit; the control circuit is used for acquiring a working voltage of the electronic device and a rectified voltage output by the rectifier circuit; and the control circuit is further used for controlling the open circuit to conduct the connection between the rectifier circuit and the electronic device according to the working voltage and / or the rectified voltage. The commercial power conversion circuit realizes efficient power supply in a low-voltage section. Meanwhile, compared with a traditional technical solution, the commercial power conversion circuit does not need an auxiliary winding, and a power supply low-voltage section is a fixed value set according to the demand of the electronic device, so that the circuit is further simplified, the cost is reduced, and the circuit reliability is improved.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a mains power conversion circuit, method, apparatus and storage medium. Background Technology

[0002] Currently, powering electronic devices via mains power often requires rectifying and filtering the mains power before supplying power from the resulting high-voltage DC. However, this approach frequently suffers from low power supply efficiency under no-load / light-load conditions and overheating of devices. To address these issues, the widely adopted mainstream solution is as follows: initially, the primary-side control electronics of the flyback power supply are powered by a high-voltage DC. However, once the primary-side electronics begin operating, a relatively low AC voltage generated by the auxiliary winding is rectified by diodes to supply power to the electronic devices.

[0003] During the implementation process, the inventors discovered at least the following problems in the traditional technology: the current technical solution has problems such as low efficiency and poor reliability. Summary of the Invention

[0004] Therefore, it is necessary to provide a mains power conversion circuit, method, device, and storage medium that can achieve high conversion efficiency and high reliability in response to the above-mentioned technical problems.

[0005] To achieve the above objectives, in one aspect, embodiments of the present invention provide an AC power conversion circuit, including a rectifier circuit, a control circuit, and a switching circuit;

[0006] The input terminal of the rectifier circuit is used to connect to the mains power grid, and the output terminal is connected to the first terminal of the switching circuit; the second terminal of the switching circuit is used to connect to electronic devices, and the control terminal is connected to the control circuit.

[0007] The control circuit is used to obtain the operating voltage of the electronic device and the rectified voltage output by the rectifier circuit; the control circuit is also used to control the switching circuit to connect the rectifier circuit and the electronic device according to the operating voltage and / or rectified voltage.

[0008] In one embodiment, the switching circuit includes a capacitor module and a switching module;

[0009] One end of the capacitor module is connected to the output of the rectifier circuit, and the other end is grounded; the capacitor module includes at least two capacitors; the capacitors are connected in series; the switch module includes N switches; the first end of each switch is connected to any end of the corresponding capacitor, the second end is used to connect to electronic devices, and the control end is connected to the control circuit; the i-th switch corresponds to a threshold voltage V. i And V i <V i-1 The voltage at the first terminal of the i-th switch is greater than the voltage at the first terminal of the (i-1)-th switch; where N ≥ 2; N is a positive integer i ∈ {2, ..., N};

[0010] The control circuit is used to acquire the rectified voltage output by the rectifier circuit, and to acquire the operating voltage of the electronic devices when the rectified voltage is less than a preset voltage; the control circuit is also used to control each switch to disconnect the rectifier circuit from the electronic devices when the operating voltage is greater than a first voltage; the control circuit is also used to control the switches to disconnect the rectifier circuit from the electronic devices when the operating voltage is less than a threshold voltage V. i In the case where the first voltage is greater than the threshold voltage V, the i-th switch is closed and the (i-1)-th switch is opened until the operating voltage rises or remains stable. i .

[0011] In one embodiment, a power conversion device is also included;

[0012] The second terminal of each switch is connected to electronic devices via a power control device.

[0013] In one embodiment, the control circuit is used to control the switching circuit to connect the rectifier circuit and the electronic device when the rectified voltage is less than the third voltage and the operating voltage is less than the fourth voltage.

[0014] In one embodiment, the switching circuit includes a diode, a first switching device, a second switching device, a third switching device, and a first voltage divider; wherein the first switching device is a depletion-type switching device;

[0015] The control terminal of the first switching device is grounded, the first terminal is connected to the output terminal of the rectifier circuit, and the second terminal is connected to the anode of the diode. The cathode of the diode is connected to one end of the first voltage divider and the first terminal of the second switching device. The other end of the first voltage divider is connected to the first terminal of the third switching device and the control terminal of the second switching device. The second terminal of the second switching device is connected to an electronic device. The control terminal of the third switching device is connected to the control circuit, and the second terminal is grounded.

[0016] In one embodiment, the switching circuit further includes a fourth switching device, a fifth switching device, a sixth switching device, and a second voltage divider device;

[0017] The control terminal of the fourth switching device is connected to one end of the second voltage divider and the first end of the fifth switching device. The first end is connected to the other end of the second voltage divider and the second end of the first switching device. The second end is connected to the control terminal of the first switching device and the first end of the sixth switching device. The control terminal of the fifth switching device is connected to the control circuit, and the second end is grounded. The control terminal of the sixth switching device is connected to the control circuit, and the second end is grounded.

[0018] The control circuit is used to output a high-level signal to the third and fifth switching devices and a low-level signal to the sixth switching device when the rectified voltage is less than the third voltage and the operating voltage is less than the fourth voltage.

[0019] In one embodiment, the switching circuit further includes a decoupling capacitor; one end of the decoupling capacitor is connected to the second terminal of the second switching device, and the other end is grounded.

[0020] On the one hand, embodiments of the present invention also provide a mains power conversion method, including the following steps:

[0021] The operating voltage of the electronic device and the rectified voltage output by the rectifier circuit are obtained. The input terminal of the rectifier circuit is connected to the mains power grid, and the output terminal is connected to one end of the switching device. The rectified voltage is obtained by rectifying the mains power grid voltage with the rectified voltage. The other end of the switching circuit is used to connect the electronic device.

[0022] Based on the operating voltage and / or rectified voltage, control the switching circuit to connect the rectifier circuit and electronic devices.

[0023] In one embodiment, the step of obtaining the operating voltage of the electronic device and the rectified voltage output by the rectifier circuit includes:

[0024] Obtain the rectified voltage output by the rectifier circuit, and obtain the operating voltage of the electronic device when the rectified voltage is less than the preset voltage;

[0025] The steps for controlling the switching circuit to connect the rectifier circuit and electronic devices according to the operating voltage and / or rectified voltage include:

[0026] When the operating voltage exceeds a first voltage, the switches are controlled to disconnect the rectifier circuit from the electronic components. The disconnecting devices include a capacitor module and a switch module. One end of the capacitor module is connected to the output of the rectifier circuit, and the other end is grounded. Each capacitor module includes at least two capacitors connected in series. The switch module includes N switches. The first end of each switch is connected to any end of the corresponding capacitor, the second end is used to connect to the electronic components, and the control end is connected to the control circuit. The i-th switch corresponds to a threshold voltage V. i And V i <V i-1 The voltage at the first terminal of the i-th switch is greater than the voltage at the first terminal of the (i-1)-th switch; where N ≥ 2; N is a positive integer i ∈ {2, ..., N};

[0027] When the operating voltage is less than the threshold voltage V i In the case where the first voltage is greater than the threshold voltage V, the i-th switch is closed and the (i-1)-th switch is opened until the operating voltage rises or remains stable. i .

[0028] In one embodiment, the step of controlling the switching circuit to connect the rectifier circuit to the electronic device based on the operating voltage and / or the rectified voltage includes:

[0029] When the rectified voltage is less than the third voltage and the operating voltage is less than the fourth voltage, the control switching circuit connects the rectifier circuit to the electronic devices.

[0030] On one hand, embodiments of the present invention also provide an AC / DC conversion device, comprising:

[0031] The acquisition module is used to acquire the operating voltage of the electronic device and the rectified voltage output by the rectifier circuit; wherein, the input terminal of the rectifier circuit is used to connect to the mains power grid, and the output terminal is connected to one end of the switching device; the rectified voltage is obtained by rectifying the mains power grid voltage with the rectified voltage; the other end of the switching circuit is used to connect to the electronic device;

[0032] The control module is used to control the connection between the switching circuit and the rectifier circuit and the electronic devices based on the operating voltage and / or rectified voltage.

[0033] On the other hand, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any of the above methods.

[0034] One of the above technical solutions has the following advantages and beneficial effects:

[0035] The aforementioned mains power conversion circuit obtains the operating voltage of the electronic devices and the rectified voltage output by the rectifier circuit, and controls the switching circuit to connect the rectifier circuit and the electronic devices based on the operating voltage and / or rectified voltage, thereby achieving efficient power supply in the low-voltage range. Furthermore, compared to traditional solutions, this mains power conversion circuit eliminates the need for auxiliary windings and uses a fixed value for the low-voltage range based on the requirements of the electronic devices, further simplifying the circuit, reducing costs, and improving circuit reliability. Attached Figure Description

[0036] The above and other objects, features, and advantages of this application will become clearer through a more detailed description of the preferred embodiments illustrated in the accompanying drawings. The same reference numerals denote the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the main points of this application.

[0037] Figure 1 This is a first schematic block diagram of a mains power conversion circuit in one embodiment;

[0038] Figure 2 This is a schematic diagram of the mains rectification process in one embodiment;

[0039] Figure 3 This is a first schematic structural block diagram of an switching circuit in one embodiment;

[0040] Figure 4 This is a second schematic block diagram of the switching circuit in one embodiment;

[0041] Figure 5 This is a third schematic block diagram of the switching circuit in one embodiment;

[0042] Figure 6 This is a fourth schematic block diagram of the switching circuit in one embodiment;

[0043] Figure 7 This is a fifth schematic block diagram of the switching circuit in one embodiment;

[0044] Figure 8 This is a first schematic flowchart of a mains power conversion method in one embodiment;

[0045] Figure 9 This is a flowchart illustrating the steps of controlling the switching circuit to connect the rectifier circuit and the electronic device according to the operating voltage and / or rectified voltage in one embodiment.

[0046] Figure 10 This is a structural block diagram of a mains power conversion device in one embodiment. Detailed Implementation

[0047] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate preferred embodiments of the application. However, this application may 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.

[0048] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0049] 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 in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0050] In one embodiment, such as Figure 1 As shown, a mains power conversion circuit is provided, including a rectifier circuit, a control circuit, and a switching circuit;

[0051] The input terminal of the rectifier circuit is used to connect to the mains power grid, and the output terminal is connected to the first terminal of the switching circuit; the second terminal of the switching circuit is used to connect to electronic devices, and the control terminal is connected to the control circuit.

[0052] The control circuit is used to obtain the operating voltage of the electronic device and the rectified voltage output by the rectifier circuit; the control circuit is also used to control the switching circuit to connect the rectifier circuit and the electronic device according to the operating voltage and / or rectified voltage.

[0053] The rectifier circuit is used to rectify the mains power and can be any type of rectifier circuit in this field. The control circuit is a circuit with control capability, capable of controlling the opening and closing of the switching circuit; the switching circuit is used to connect or disconnect the rectifier circuit from the electronic device. The electronic device can be any type of electronic device in this field, without further limitations.

[0054] Specifically, the mains power grid converts the alternating current (AC) from the mains electricity into rectified current through a rectifier circuit. A detailed conversion diagram can be found in [reference needed]. Figure 2 The control circuit can obtain the operating voltage of the electronic device and the rectified voltage output by the rectifier circuit using any means in the art, such as using a voltage transformer to obtain the voltage. The control circuit can control the switching circuit to connect the rectifier circuit and the electronic device based on the rectified voltage, or it can control the switching circuit to connect the rectifier circuit and the electronic device based on the operating voltage and the rectified voltage.

[0055] In a specific example, when the rectified voltage is lower than a preset voltage, the control circuit controls the switching circuit to connect the rectifier circuit to the electronic device. This utilizes the low-voltage range of the mains power supply, thus achieving efficient power supply. The preset voltage is a fixed value, which can be determined based on factors such as the supply voltage of the electronic device. In this case, the control circuit may include a comparator. The non-inverting input of the comparator is connected to the rectified voltage, the inverting input is connected to any circuit that can provide the set voltage value, and the output is connected to the switching circuit. Based on the comparison between the rectified voltage and the preset voltage, the control circuit connects the rectifier circuit to the electronic device, thereby reducing the efficiency of the mains power conversion circuit and improving the reliability of the circuit while utilizing the low-voltage range of the mains power supply.

[0056] In another specific example, the control circuit controls the switching circuit to connect the rectifier circuit and the electronic device when the rectified voltage is less than the third voltage and the operating voltage is less than the fourth voltage. It should be noted that the fourth voltage is the critical voltage for the electronic device to be fully charged; when the operating voltage is greater than or equal to the fourth voltage, the electronic device is fully charged and does not require further charging. The third voltage is a fixed value and can be determined based on factors such as the supply voltage of the electronic device. By supplying power to the electronic device when the operating voltage is less than the third voltage and the rectified voltage is less than the fourth voltage, power supply efficiency is improved.

[0057] The aforementioned mains power conversion circuit obtains the operating voltage of the electronic devices and the rectified voltage output by the rectifier circuit, and controls the switching circuit to connect the rectifier circuit and the electronic devices based on the operating voltage and / or rectified voltage, thereby achieving efficient power supply in the low-voltage range. Furthermore, compared to traditional solutions, this mains power conversion circuit eliminates the need for auxiliary windings and uses a fixed value for the low-voltage range based on the requirements of the electronic devices, further simplifying the circuit, reducing costs, and improving circuit reliability.

[0058] In one embodiment, such as Figure 3 As shown,

[0059] In one embodiment, the switching circuit includes a capacitor module and a switching module;

[0060] One end of the capacitor module is connected to the output of the rectifier circuit, and the other end is grounded; the capacitor module includes at least two capacitors; the capacitors are connected in series; the switch module includes N switches; the first end of each switch is connected to any end of the corresponding capacitor, the second end is used to connect to electronic devices, and the control end is connected to the control circuit; the i-th switch corresponds to a threshold voltage V. i And V i <V i-1 The voltage at the first terminal of the i-th switch is greater than the voltage at the first terminal of the (i-1)-th switch; where i∈{2,…,N},N≥2;N is a positive integer.

[0061] The control circuit is used to acquire the rectified voltage output by the rectifier circuit, and to acquire the operating voltage of the electronic devices when the rectified voltage is less than a preset voltage; the control circuit is also used to control each switch to disconnect the rectifier circuit from the electronic devices when the operating voltage is greater than a first voltage; the control circuit is also used to control the switches to disconnect the rectifier circuit from the electronic devices when the operating voltage is less than a threshold voltage V. i In the case where the first voltage is greater than the threshold voltage V, the i-th switch is closed and the (i-1)-th switch is opened until the operating voltage rises or remains stable. i Preferably, the number of switches in the switch module is less than or equal to the number of capacitors in the capacitor module.

[0062] The capacitor module includes at least two capacitors connected in series. The switch module includes at least two switches, whose opening and closing are controlled by a control circuit. These switches can be any type of controlled switch in the art. The preset voltage is a fixed value, which can be determined based on factors such as the power supply voltage of the electronic device. The first voltage is the critical voltage at which the electronic device is fully charged; when the operating voltage is greater than or equal to the first voltage, the electronic device is fully charged and does not require further charging. Threshold voltage V i All are lower than the first voltage.

[0063] Specifically, the number of capacitors in the switch module can be greater than the number of switches in the switch module. Each switch corresponds to one capacitor. The first terminal of all switches can be connected to either the first or second terminal of the corresponding capacitor. Preferably, the first terminal of all switches is connected to the relatively high-level terminal of the corresponding capacitor. One end of the capacitor module is connected to the output terminal of the rectifier circuit, and the other end is grounded, which is equivalent to each capacitor dividing the rectified voltage. The first terminal of each switch is connected to either terminal of the corresponding capacitor, and the second terminal is used to connect to electronic devices, so that the divided voltage can be provided to the electronic devices.

[0064] Furthermore, the control circuit obtains the operating voltage when the rectified voltage is lower than a preset voltage. When the operating voltage is higher than the first voltage, it indicates that no power supply is needed, and all switches are controlled to disconnect the rectifier circuit from the electronic components; when the operating voltage is lower than the threshold voltage V... i When this occurs, it indicates that the electronic device needs power, and the control is adjusted according to the threshold voltage V. i The corresponding i-th switch is closed. It should be noted that if the operating voltage still drops to V after closing this switch... i+1 Then, the (i+1)th switch corresponding to the decreased threshold voltage Vi+1 value continues to close until the operating voltage rises or remains stable. The different threshold voltages requiring charging correspond one-to-one with each switch; the smaller the threshold voltage, the switch with the larger voltage divider will conduct. It should be noted that only one switch closes at a time; that is, before closing the next switch, the currently closed switch must be opened to prevent a capacitor short circuit.

[0065] In one embodiment, such as Figure 4 As shown, it also includes power conversion devices (e.g., DC-DC switching power supplies, LDO linear regulators, current sources);

[0066] The second terminal of each switch is connected to electronic devices via a power conversion device.

[0067] Specifically, each voltage divider is converted by a power conversion device to power the electronic devices. In one specific example, the power conversion device is a current source.

[0068] In one embodiment, the control circuit is used to control the switching circuit to connect the rectifier circuit and the electronic device when the rectified voltage is less than the third voltage and the operating voltage is less than the fourth voltage.

[0069] In one embodiment, such as Figure 5 As shown, the switching circuit includes diode D1, first switching device Q1, second switching device Q2, third switching device Q3, and first voltage divider device R1. The first switching device Q1 is a depletion-type switching device. The control terminal of the first switching device Q1 is grounded, its first terminal is connected to the output terminal of the rectifier circuit, and its second terminal is connected to the anode of diode D1. The cathode of diode D1 is connected to one end of the first voltage divider device R1 and the first terminal of the second switching device Q2. The other end of the first voltage divider device R1 is connected to the first terminal of the third switching device Q3 and the control terminal of the second switching device Q2. The second terminal of the second switching device Q2 is connected to an electronic device. The control terminal of the third switching device Q3 is connected to a control circuit, and its second terminal is grounded. Each switching device can be any type of switching device in the art, such as a MOSFET or MOSFET. The voltage divider device can be any device with voltage dividing capability, such as a resistor. The diode is used to limit the current flow to prevent backflow.

[0070] Specifically, the first switching device is a depletion-type switching device. When the voltage at the first terminal of the first switching device is higher than the voltage at the third terminal, whether the first switch is on and whether it supplies power also depends on whether the second switching device is on. When the second switching device is on, the first switching device is on. The third switching device is turned on or off according to the output signal of the control circuit. When the control circuit outputs a high level, the third switching device is on, thus turning on the second switching device and connecting the rectifier circuit to the electronic device. When the control circuit outputs a low level, the third switching device is off, thus turning off the second switching device and disconnecting the rectifier circuit from the electronic device. Therefore, the control circuit can output high and low level signals as needed to control the switching circuit to turn on or off the connection between the rectifier circuit and the electronic device. In a specific example, the first switching device is a field-effect transistor (FET); the gate of the FET is grounded, the source is connected to the anode of the diode, and the drain is connected to the output terminal of the rectifier circuit. The second switching device is a PMOS transistor, whose gate is connected to the first voltage divider and the second voltage divider, whose drain is connected to an electronic device, and whose source is connected to the cathode of a diode; the third switching device is an NMOS transistor, whose gate is connected to the control circuit, whose source is grounded, and whose drain is connected to the second voltage divider.

[0071] In one embodiment, such as Figure 6 As shown, the switching circuit also includes a fourth switching device Q4, a fifth switching device Q5, a sixth switching device Q6, and a second voltage divider device R2;

[0072] The control terminal of the fourth switching device Q4 is connected to one end of the second voltage divider device R2 and the first end of the sixth switching device Q6. The first end is connected to the other end of the second voltage divider device R2 and the second end of the first switching device Q1. The second end is connected to the control terminal of the first switching device Q1 and the first end of the fifth switching device Q5. The control terminal of the fifth switching device Q5 is connected to the control circuit, and the second end is grounded. The control terminal of the sixth switching device Q6 is connected to the control circuit, and the second end is grounded.

[0073] The control circuit is used to output a high-level signal to the third switching device Q3 and the fifth switching device Q5, and a low-level signal to the sixth switching device Q6 when the rectified voltage is less than the third voltage and the operating voltage is less than the fourth voltage.

[0074] The third voltage is a fixed value, which can be determined based on factors such as the power supply voltage of the electronic device. The fourth voltage is the critical voltage at which the electronic device is fully charged; when the operating voltage is greater than or equal to the first voltage, the electronic device is fully charged and does not require further charging.

[0075] Specifically, when the rectified voltage is less than the third voltage and the operating voltage is less than the fourth voltage, the control circuit outputs a high-level signal to the third switching device Q3 and the fifth switching device Q5, and a low-level signal to the sixth switching device Q6. At this time, the gate and source of the first switching device Q1 are turned on, and the rectifier circuit and electronic devices are turned on, thereby improving the power transmission efficiency of the first switching device Q1.

[0076] Furthermore, such as Figure 7 As shown, the switching circuit also includes a third voltage divider R3 and a fourth voltage divider R4; the other end of the first voltage divider R1 is connected to one end of the third voltage divider R3 and the control terminal of the second switching device Q2, respectively; the other end of the third voltage divider R3 is connected to the first terminal of the third switching device Q3. The second switching device Q2 is protected by the third voltage divider R3. One end of the fourth voltage divider R4 is connected to the drain of the fifth switching device Q5, and the other end is connected to the gate of the fourth switching device Q4 and one end of the second voltage divider R2. The fourth switching device Q4 is protected by the fourth voltage divider R4.

[0077] In one embodiment, the switching circuit further includes a decoupling capacitor; one end of the decoupling capacitor is connected to the second terminal of the second switching device, and the other end is grounded.

[0078] Specifically, the decoupling capacitor is used for filtering.

[0079] In one embodiment, such as Figure 8 As shown, a mains power conversion method is also provided, including the following steps:

[0080] S810 acquires the operating voltage of the electronic device and the rectified voltage output by the rectifier circuit; wherein, the input terminal of the rectifier circuit is used to connect to the mains power grid, and the output terminal is connected to one end of the switching device; the rectified voltage is obtained by rectifying the voltage of the mains power grid with the rectified voltage; the other end of the switching circuit is used to connect to the electronic device;

[0081] The rectifier circuit is used to rectify the mains power and can be any type of rectifier circuit in the art. The switching circuit is used to connect or disconnect the rectifier circuit from the electronic device. The electronic device can be any type of electronic device in the art, and no further limitations are imposed here.

[0082] Specifically, the operating voltage of electronic devices and the rectified voltage output by rectifier circuits can be obtained by any means in this field, such as by using a voltage transformer to obtain the voltage.

[0083] S820 controls the switching circuit to connect the rectifier circuit and electronic devices based on the operating voltage and / or rectified voltage.

[0084] Specifically, the switching circuit can be controlled to connect the rectifier circuit and electronic devices based on the rectified voltage, or the connection can be controlled to connect the rectifier circuit and electronic devices based on the operating voltage and the rectified voltage.

[0085] In one embodiment, the step of obtaining the operating voltage of the electronic device and the rectified voltage output by the rectifier circuit includes:

[0086] Obtain the rectified voltage output by the rectifier circuit, and obtain the operating voltage of the electronic device when the rectified voltage is less than the preset voltage;

[0087] Specifically, the preset voltage is a fixed value, which can be determined based on factors such as the power supply voltage of the electronic devices.

[0088] like Figure 9 As shown, the steps for controlling the switching circuit to connect the rectifier circuit and electronic devices according to the operating voltage and / or rectified voltage include:

[0089] S910, when the operating voltage is greater than a first voltage, controls each switch to disconnect the rectifier circuit from the electronic device; wherein, the disconnecting device includes a capacitor module and a switch module; one end of the capacitor module is connected to the output terminal of the rectifier circuit, and the other end is grounded; the capacitor module includes at least two capacitors; the capacitors are connected in series; the switch module includes N switches; the first end of the switch is connected to any end of the corresponding capacitor, and the second end is used to connect to the electronic device; the i-th switch corresponds to a threshold voltage V. i And V i <V i-1The voltage at the first terminal of the i-th switch is greater than the voltage at the first terminal of the (i-1)-th switch; where N ≥ 2; N is a positive integer; i ∈ {2, ..., N};

[0090] The first voltage is the critical voltage at which the electronic device is fully charged. When the operating voltage is greater than or equal to the first voltage, the electronic device is fully charged and does not need to be recharged.

[0091] Specifically, when the operating voltage is greater than the first voltage, all switches are disconnected.

[0092] S920, when the operating voltage is less than the threshold voltage V i In the case where the first voltage is greater than the threshold voltage V, the i-th switch is closed and the (i-1)-th switch is opened until the operating voltage rises or remains stable. i .

[0093] Specifically, when the operating voltage is lower than the second voltage, it indicates that the electronic device needs power, and the switch corresponding to the operating voltage value is closed. It should be noted that if the operating voltage continues to drop after closing this switch, the switch corresponding to the decreased operating voltage value continues to close until the operating voltage rises or stabilizes. There is a one-to-one correspondence between the operating voltage value and the switch; the smaller the operating voltage value, the larger the voltage drop across the switch output. It should also be noted that only one switch can be closed at a time; that is, the currently closed switch must be opened before closing the next switch to prevent damage to the components.

[0094] In one embodiment, the step of controlling the switching circuit to connect the rectifier circuit to the electronic device based on the operating voltage and / or the rectified voltage includes:

[0095] When the rectified voltage is less than the third voltage and the operating voltage is less than the fourth voltage, the control switching circuit connects the rectifier circuit to the electronic devices.

[0096] It should be understood that, although Figure 8-9 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order requirement for the execution of these steps; they can be executed in other orders. Furthermore, Figure 8-9 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0097] In one embodiment, such as Figure 10 As shown, a mains power conversion device is provided, comprising:

[0098] The acquisition module is used to acquire the operating voltage of the electronic device and the rectified voltage output by the rectifier circuit; wherein, the input terminal of the rectifier circuit is used to connect to the mains power grid, and the output terminal is connected to one end of the switching device; the rectified voltage is obtained by rectifying the mains power grid voltage with the rectified voltage; the other end of the switching circuit is used to connect to the electronic device;

[0099] The control module is used to control the connection between the switching circuit and the rectifier circuit and the electronic devices based on the operating voltage and / or rectified voltage.

[0100] Specific limitations regarding the mains power conversion device can be found in the limitations of the mains power conversion method above, and will not be repeated here. Each module in the aforementioned mains power conversion device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0101] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0102] The operating voltage of the electronic device and the rectified voltage output by the rectifier circuit are obtained. The input terminal of the rectifier circuit is connected to the mains power grid, and the output terminal is connected to one end of the switching device. The rectified voltage is obtained by rectifying the mains power grid voltage with the rectified voltage. The other end of the switching circuit is used to connect the electronic device.

[0103] Based on the operating voltage and / or rectified voltage, control the switching circuit to connect the rectifier circuit and electronic devices.

[0104] In one embodiment, when the step of obtaining the operating voltage of the electronic device and the rectified voltage output by the rectifier circuit is executed by the processor, the following steps are also performed:

[0105] Obtain the rectified voltage output by the rectifier circuit, and obtain the operating voltage of the electronic device when the rectified voltage is less than the preset voltage;

[0106] In one embodiment, when the step of controlling the switching circuit to connect the rectifier circuit to the electronic device based on the operating voltage and / or the rectified voltage is executed by the processor, the following steps are also performed:

[0107] When the operating voltage is greater than the first voltage, the switches are controlled to disconnect the rectifier circuit from the electronic devices. The switching device includes a capacitor module and a switch module. One end of the capacitor module is connected to the output terminal of the rectifier circuit, and the other end is grounded. The capacitor module includes at least two capacitors. The capacitors are connected in series. The switch module includes at least two switches. The first end of the switch is connected to any end of the corresponding capacitor, and the second end is used to connect to the electronic devices.

[0108] When the operating voltage is less than the second voltage, the switch corresponding to the operating voltage value is closed until the operating voltage rises or remains stable; wherein, the first voltage is greater than the second voltage.

[0109] In one embodiment, when the step of controlling the switching circuit to connect the rectifier circuit to the electronic device based on the operating voltage and / or the rectified voltage is executed by the processor, the following steps are also performed:

[0110] When the rectified voltage is less than the third voltage and the operating voltage is less than the fourth voltage, the control switching circuit connects the rectifier circuit to the electronic devices.

[0111] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), memory bus DRAM (RDRAM), and interface DRAM (DRDRAM), etc.

[0112] 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.

[0113] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A mains power conversion circuit, characterized in that, Includes rectifier circuits, control circuits, and switching circuits; The input terminal of the rectifier circuit is used to connect to the mains power grid, and the output terminal is connected to the first terminal of the switching circuit; the second terminal of the switching circuit is used to connect to electronic devices, and the control terminal is connected to the control circuit. The control circuit is used to acquire the operating voltage of the electronic device and the rectified voltage output by the rectifier circuit; the control circuit is also used to control the switching circuit to connect the rectifier circuit and the electronic device according to the operating voltage and / or the rectified voltage. The switching circuit includes a capacitor module and a switch module; One end of the capacitor module is connected to the output terminal of the rectifier circuit, and the other end is grounded; the capacitor module includes at least two capacitors; the capacitors are connected in series; the switch module includes N switches; the first end of each switch is connected to any end of the corresponding capacitor, the second end is used to connect to the electronic device, and the control end is connected to the control circuit; the i-th switch corresponds to a threshold voltage V. i And V i <V i-1 The voltage at the first terminal of the i-th switch is greater than the voltage at the first terminal of the (i-1)-th switch; where N ≥ 2; N is a positive integer; i ∈ {1, ..., N}; The control circuit is used to acquire the rectified voltage output by the rectifier circuit, and when the rectified voltage is less than a preset voltage, acquire the operating voltage of the electronic device and control the switching circuit to connect the rectifier circuit and the electronic device; the control circuit is also used to control each of the switches to disconnect the connection between the rectifier circuit and the electronic device when the operating voltage is greater than a first voltage; the control circuit is also used to control the switches to disconnect the connection between the rectifier circuit and the electronic device when the operating voltage is less than a threshold voltage V. i In the case where the first voltage is greater than the threshold voltage V, the i-th switch is closed and the (i-1)-th switch is opened until the operating voltage rises or remains stable; wherein the first voltage is greater than the threshold voltage V. i .

2. The mains power conversion circuit according to claim 1, characterized in that, It also includes power conversion equipment; The second terminal of each of the aforementioned switching circuits is connected to the electronic device via the power conversion device.

3. The mains power conversion circuit according to claim 1, characterized in that, The control circuit is used to control the switching circuit to connect the rectifier circuit and the electronic device when the rectified voltage is less than the third voltage and the operating voltage is less than the fourth voltage.

4. The mains power conversion circuit according to claim 3, characterized in that, The switching circuit includes a diode, a first switching device, a second switching device, a third switching device, and a first voltage divider; wherein the first switching device is a depletion-type switching device; The control terminal of the first switching device is grounded, the first terminal is connected to the output terminal of the rectifier circuit, and the second terminal is connected to the anode of the diode; the cathode of the diode is connected to one end of the first voltage divider and the first terminal of the second switching device; the other end of the first voltage divider is connected to the first terminal of the third switching device and the control terminal of the second switching device; the second terminal of the second switching device is connected to the electronic device; the control terminal of the third switching device is connected to the control circuit, and the second terminal is grounded.

5. The mains power conversion circuit according to claim 4, characterized in that, The switching circuit also includes a fourth switching device, a fifth switching device, a sixth switching device, and a second voltage divider device; The control terminal of the fourth switching device is connected to one end of the second voltage divider and the first end of the fifth switching device, the first end of the fifth switching device is connected to the other end of the second voltage divider and the second end of the first switching device, and the second end of the fifth switching device is connected to the control terminal of the first switching device and the first end of the sixth switching device; the control terminal of the fifth switching device is connected to the control circuit, and the second end is grounded; the control terminal of the sixth switching device is connected to the control circuit, and the second end is grounded. The control circuit is used to output a high-level signal to the third and fifth switching devices and a low-level signal to the sixth switching device when the rectified voltage is less than the third voltage and the operating voltage is less than the fourth voltage.

6. The mains power conversion circuit according to claim 5, characterized in that, The switching circuit also includes a decoupling capacitor; one end of the decoupling capacitor is connected to the second terminal of the second switching device, and the other end is grounded.

7. A method for converting mains power to AC power, characterized in that, Applied to the mains power conversion circuit according to any one of claims 1 to 6, the mains power conversion method includes the steps of: The system obtains the operating voltage of the electronic device and the rectified voltage output by the rectifier circuit; wherein, the input terminal of the rectifier circuit is connected to the mains power grid, and the output terminal is connected to one end of the switching device; the rectified voltage is obtained by rectifying the voltage of the mains power grid; the other end of the switching circuit is used to connect to the electronic device. Based on the operating voltage and / or the rectified voltage, control the switching circuit to connect the rectified circuit to the electronic device; The steps of obtaining the operating voltage of the electronic device and the rectified voltage output by the rectifier circuit include: Obtain the rectified voltage output by the rectifier circuit, and when the rectified voltage is less than a preset voltage, obtain the operating voltage of the electronic device and control the switching circuit to connect the rectifier circuit and the electronic device; The step of controlling the switching circuit to connect the rectifier circuit and the electronic device according to the operating voltage and / or the rectified voltage includes: When the operating voltage is greater than a first voltage, each of the switches is controlled to disconnect the rectifier circuit from the electronic device; wherein, the disconnecting device includes a capacitor module and a switch module; one end of the capacitor module is connected to the output terminal of the rectifier circuit, and the other end is grounded; the capacitor module includes at least two capacitors; the capacitors are connected in series; the switch module includes N switches; the first end of each switch is connected to any end of the corresponding capacitor, the second end is used to connect to the electronic device, and the control end is connected to the control circuit; the i-th switch corresponds to a threshold voltage V. i And V i <V i-1 The voltage at the first terminal of the i-th switch is greater than the voltage at the first terminal of the (i-1)-th switch; where N ≥ 2; N is a positive integer; i ∈ {2, ..., N}; When the operating voltage is less than the threshold voltage V i In the case where the first voltage is greater than the threshold voltage V, the i-th switch is closed and the (i-1)-th switch is opened until the operating voltage rises or remains stable; wherein the first voltage is greater than the threshold voltage V. i .

8. The mains power conversion method according to claim 7, characterized in that, The step of controlling the switching circuit to connect the rectifier circuit and the electronic device according to the operating voltage and / or the rectified voltage includes: When the rectified voltage is less than the third voltage and the operating voltage is less than the fourth voltage, the switching circuit is controlled to connect the rectifier circuit to the electronic device.

9. A mains power conversion device, characterized in that, For performing the mains power conversion method according to claim 7 or 8, the mains power conversion device includes: The acquisition module is used to acquire the operating voltage of the electronic device and the rectified voltage output by the rectifier circuit; wherein, the input terminal of the rectifier circuit is used to connect to the mains power grid, and the output terminal is connected to one end of the switching device; the rectified voltage is obtained by rectifying the voltage of the mains power grid; the other end of the switching circuit is used to connect to the electronic device; it also acquires the rectified voltage output by the rectifier circuit, and when the rectified voltage is less than a preset voltage, acquires the operating voltage of the electronic device and controls the switching circuit to connect the rectifier circuit and the electronic device; The control module is used to control the switching circuit to connect the rectifier circuit and the electronic device according to the operating voltage and / or the rectified voltage; and to control each of the switches to disconnect the rectifier circuit and the electronic device when the operating voltage is greater than a first voltage; wherein, the switching device includes a capacitor module and a switch module; one end of the capacitor module is connected to the output terminal of the rectifier circuit, and the other end is grounded; the capacitor module includes at least two capacitors; the capacitors are connected in series; the switch module includes N switches; the first end of each switch is connected to any end of the corresponding capacitor, the second end is used to connect to the electronic device, and the control end is connected to the control circuit; the i-th switch corresponds to a threshold voltage V. i And V i <V i-1 The voltage at the first terminal of the i-th switch is greater than the voltage at the first terminal of the (i-1)-th switch; where N ≥ 2; N is a positive integer; i ∈ {1, ..., N}; used when the operating voltage is less than the threshold voltage V i In the case where the first voltage is greater than the threshold voltage V, the i-th switch is closed and the (i-1)-th switch is opened until the operating voltage rises or remains stable; wherein the first voltage is greater than the threshold voltage V. i .

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method of claim 7 or 8.

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