Power supply device, charging method and system

Abstract

The embodiment of the invention discloses a power supply device and a charging method and system. The power supply device comprises a rectification module used for rectifying an AC voltage to obtain a first pulsating DC voltage; the conversion module is used for converting the first pulsating direct-current voltage to obtain stable direct-current voltage; the valley filling circuit is respectively connected with the rectification module and the conversion module, and is used for boosting the first pulsating direct-current voltage output by the rectification module when the voltage value of the first pulsating direct-current voltage is greater than a first voltage threshold value, and storing energy based on the boosted first pulsating direct-current voltage; and when the voltage value of the first pulsating direct-current voltage is smaller than a second voltage threshold value, electric energy is provided for the conversion module, so that the trough voltage of the first pulsating direct-current voltage input to the conversion module is increased. According to the power supply device, the charging method and the charging system, the size of the power supply device can be reduced, and the stability of the output voltage of the power supply device is ensured.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and in particular to a power supply device, a charging method and a system. Background Art

[0002] With the rapid development of electronic technology, more and more electronic products are appearing on the market, and electronic products have become an indispensable part of users' lives. In order to ensure normal operation, many electronic products on the market (such as mobile phones, wearable devices, etc.) need to be charged frequently. At present, the size of devices (such as adapters, etc.) that can provide power to electronic products is usually large and inconvenient to carry. How to reduce the size of the device that provides power has become a problem that needs to be solved urgently. Summary of the invention

[0003] The embodiments of the present application disclose a power supply device, a charging method and a system, which can reduce the volume of the power supply device and ensure the stability of the output voltage of the power supply device.

[0004] The present application discloses a power supply device, including:

[0005] A rectifier module, used for rectifying the AC voltage to obtain a first pulsating DC voltage;

[0006] A conversion module, used for converting the first pulsating DC voltage to obtain a stable DC voltage;

[0007] The valley filling circuit is connected to the rectifier module and the conversion module respectively, and is used to boost the first pulsating DC voltage output by the rectifier module when the voltage value of the first pulsating DC voltage is greater than a first voltage threshold, and store energy based on the boosted first pulsating DC voltage, and to provide electric energy to the conversion module when the voltage value of the first pulsating DC voltage is less than a second voltage threshold, so as to increase the valley voltage of the first pulsating DC voltage input to the conversion module, wherein the first voltage threshold is greater than the second voltage threshold.

[0008] The present application embodiment discloses a charging method, which is applied to a power supply device, and the method includes:

[0009] Rectifying the received AC voltage through a rectifying module to obtain a first pulsating DC voltage;

[0010] The first pulsating DC voltage is transformed by a transformation module to obtain a stable DC voltage;

[0011] When the voltage value of the first pulsating DC voltage is greater than a first voltage threshold, the first pulsating DC voltage output by the rectifier module is boosted by a valley filling circuit, and the valley filling circuit is charged based on the boosted first pulsating DC voltage;

[0012] When the voltage value of the first pulsating DC voltage is less than a second voltage threshold, electric energy is provided to the conversion module through a valley filling circuit to increase the valley voltage of the first pulsating DC voltage input to the conversion module, wherein the first voltage threshold is greater than the second voltage threshold.

[0013] The embodiment of the present application discloses a charging system, including the power supply device and the terminal as described above, wherein:

[0014] The power supply device further comprises an output interface, wherein the output interface is connected to an output end of a secondary conversion circuit of the power supply device;

[0015] The terminal includes a battery charging circuit;

[0016] The battery charging circuit is used to receive the DC voltage output by the output interface and charge the battery in the terminal based on the output DC voltage.

[0017] An embodiment of the present application discloses a power supply device, including a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor implements the method described above.

[0018] The power supply device, charging method and system disclosed in the embodiments of the present application, the power supply device includes a rectifier module, a valley filling circuit and a conversion module, the rectifier module rectifies the AC voltage to obtain a first pulsating DC voltage, the conversion module converts the first pulsating DC voltage to obtain a stable DC voltage, when the voltage value of the first pulsating DC voltage output by the rectifier module is greater than the first voltage threshold, the valley filling circuit boosts the first pulsating DC voltage output by the rectifier module, and stores energy based on the boosted first pulsating DC voltage, by boosting the first pulsating DC voltage, the valley filling circuit can store more electric energy, thereby reducing the number and / or volume of energy storage devices in the valley filling circuit, thereby reducing the volume of the power supply device.

[0019] When the voltage value of the first pulsating DC voltage output by the rectifier module is less than the second voltage threshold, the valley filling circuit provides electric energy to the conversion module to increase the valley voltage of the first pulsating DC voltage input to the conversion module, so that the first pulsating DC voltage input to the conversion module has a sufficiently high valley voltage, which can provide sufficient power support for the conversion module and ensure the stability of the output voltage of the power supply device. In addition, the valley voltage of the first pulsating DC voltage is increased, which can reduce the peak current during the subsequent voltage conversion, so that the size of the magnetic components in the subsequent circuit can be reduced, thereby reducing the volume of the power supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1A This is an application scenario diagram of a power supply device in one embodiment;

[0022] Figure 1B A structural block diagram of a power supply device in the related art;

[0023] Figure 2 It is a structural block diagram of a power supply device in one embodiment;

[0024] Figure 3A A structural block diagram of a power supply device in another embodiment;

[0025] Figure 3B A schematic diagram of a valley filling circuit in one embodiment;

[0026] Figure 3C It is a structural block diagram of a power supply device in another embodiment;

[0027] Figure 4 is a waveform diagram of a first pulsating DC voltage in one embodiment;

[0028] Figure 5A It is a structural block diagram of a power supply device in another embodiment;

[0029] Figure 5B It is a structural schematic diagram of a power supply device in another embodiment;

[0030] Figure 6 A schematic diagram of the connection structure of a Buck-Boost circuit in one embodiment;

[0031] Figure 7is a schematic diagram of the structure of a Buck-Boost circuit in one embodiment;

[0032] Figure 8 is a flow chart of a charging method in one embodiment;

[0033] Fig. 9 is a working flow chart of a valley filling circuit in one embodiment;

[0034] Fig.10 FIG. 4 is a structural block diagram of a charging system in one embodiment. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present application and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0037] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first switch may be referred to as a second switch, and similarly, a second switch may be referred to as a first switch. Both the first switch and the second switch are switches, but they are not the same switch.

[0038] Figure 1A FIG. 1 is an application scenario diagram of a power supply device in an embodiment. Figure 1A As shown, the power supply device 10 can output a charging voltage that meets the charging requirements to the terminal device 20 to charge the terminal device 20. Optionally, the power supply device 10 may include but is not limited to an adapter, a mobile power supply, etc., and the terminal device 20 may include but is not limited to a mobile phone, a tablet computer, a wearable device, a notebook computer, a PC (Personal Computer), etc. The embodiment of the present application does not specifically limit the product form of the power supply device 10 and the terminal device 20.

[0039] The power supply device 10 can receive the mains power provided by the power grid. Since the mains power is an AC voltage, and the charging voltage that meets the charging requirements is usually a DC voltage, the power supply device 10 needs to convert the received AC voltage to obtain a DC voltage that can be used to charge the terminal device 20. In order to better illustrate the specific method of converting the AC voltage into the DC voltage in the related art, please refer to Figure 1B , Figure 1B The present invention is a structural block diagram of a power supply device in the related art.

[0040] like Figure 1B As shown, the power supply providing device 10 may include an input interface 110, a first rectifier and filter module 120, a switching power supply 130, a transformer 140, a second rectifier and filter module 150, an output interface 160, a switch tube current control module 170, a voltage and current feedback modulation module 180 and an output voltage regulation module 190.

[0041] The AC voltage can be input into the power supply device 10 through the input interface 110 of the power supply device 10. The rectification and filtering module 120 can receive the AC voltage transmitted through the input interface 110, and rectify and filter the AC voltage to obtain a pulsating DC voltage with a first waveform. Optionally, the first waveform can be a steamed bun waveform. The switching power supply 130 can chop and modulate the pulsating DC voltage output by the rectification and filtering module 120 to obtain a pulsating voltage with a second waveform. Optionally, the second waveform can be a square wave waveform. The transformer 140 can transform the pulsating voltage obtained after the switching power supply 130 chop and modulate it, and then filter the voltage transformed by the transformer 140 through the second rectification and filtering module 150, so as to obtain a relatively stable DC voltage.

[0042] The switch tube current control module 170 can sample the current of the switch power supply 130 and feed back the sampled current to the voltage current feedback modulation module 180. The output voltage regulation module 190 can sample the voltage of the output interface 160 and feed back the sampled voltage to the voltage current feedback modulation module 180.

[0043] The voltage-current feedback modulation module 180 can control the on / off of the switching power supply 130 according to the current feedback from the switch tube current control module 170 and the voltage feedback from the output voltage regulation module 190, thereby adjusting the magnitude of the DC power output by the power supply device 10.

[0044] In the related art, a relatively large electrolytic capacitor is usually used to filter the pulsating DC voltage, which results in the power supply device 10 being generally larger in size. The embodiment of the present application provides a power supply device that can reduce the size of the power supply device.

[0045] like Figure 2 As shown, in one embodiment, a power supply device 200 is provided. The power supply device 200 may include a rectifier module 210, a valley filling circuit 220 and a conversion module 230, wherein the valley filling circuit 220 may be connected to the rectifier module 210 and the conversion module 230 respectively.

[0046] The rectifying module 210 is used to rectify the AC voltage to obtain a first pulsating DC voltage.

[0047] The power supply device 200 can receive an AC voltage through an input interface. The AC voltage can be the mains electricity received from the power grid. The voltage standard of the AC voltage can be set according to the actual application, for example, it can be 220V (volts), 100V, 110V, etc., but is not limited thereto. The embodiment of the present application does not limit the specific voltage value of the AC voltage. The rectifier module 210 can rectify the received AC voltage, convert the AC voltage with positive and negative changes into a unidirectional pulsating DC voltage, and obtain a first pulsating DC voltage with a first pulsating waveform and input it to the conversion module 230. Optionally, the first pulsating waveform can be a curved waveform, such as a steamed bun waveform. The pulsating DC voltage refers to a DC voltage whose direction remains unchanged but whose magnitude changes periodically over time.

[0048] The output end of the rectifier module 210 may be connected to the valley-filling circuit 220 to provide an input voltage to the valley-filling circuit 220 to ensure the normal operation of the valley-filling circuit 220 .

[0049] like Figure 3A As shown, in one embodiment, the rectifier module 210 may include a rectifier unit 212 and a second capacitor 214, wherein the rectifier unit 212 may be connected to the second capacitor 214. The rectifier unit 212 may include a diode bridge stack, and the rectifier unit 212 may be used to rectify the received AC voltage to obtain a rectified voltage of a pulsating DC. The second capacitor 214 may be used to filter the rectified voltage obtained by the rectifier unit 212 to obtain a first pulsating DC voltage with smaller fluctuations. In some embodiments, the capacity of the second capacitor 214 may be less than the capacity threshold. By selecting a second capacitor with a smaller capacity, the volume of the second capacitor can be reduced, thereby reducing the volume of the entire power supply device 200.

[0050] Optionally, the second capacitor 214 may include any one of a ceramic chip capacitor, a film capacitor, an electrolytic capacitor with a capacity less than a capacity threshold, etc. The ceramic chip capacitor may include a multilayer ceramic chip capacitor (Multi-layer Ceramic Capacitors, MLCC), wherein the MLCC is formed by stacking parallel ceramic materials and electrode materials. A film capacitor may be a capacitor that uses metal foil as an electrode, overlaps it with a plastic film such as polyethylene, polypropylene, polystyrene or polycarbonate from both ends, and is wound into a cylindrical structure. It should be noted that the second capacitor 214 may also be other chip capacitors, which are not limited here.

[0051] The conversion module 230 is used to convert the first pulsating DC voltage to obtain a stable DC voltage.

[0052] like Figure 3A As shown, in one embodiment, the conversion module 230 may include a primary conversion circuit 232 and a secondary conversion circuit 234, wherein the primary conversion circuit 232 may be connected to the secondary conversion circuit 234, and the output end of the rectifier module 210 is connected to the input end of the primary conversion circuit 232.

[0053] The primary conversion circuit 232 is used to perform isolation conversion on the first pulsating DC voltage to obtain a second pulsating DC voltage.

[0054] The secondary conversion circuit 234 is used to convert the second pulsating DC voltage to obtain a stable DC voltage.

[0055] The primary conversion circuit 232 can perform efficient voltage isolation conversion on the first pulsating DC voltage output by the rectifier module 210. In some embodiments, the primary conversion circuit 232 can be a step-down circuit, and the primary conversion circuit 232 can perform step-down conversion on the first pulsating DC voltage output by the rectifier module 210 to obtain a second pulsating DC voltage. The second pulsating DC voltage may be less than the first pulsating DC voltage. For example, the first pulsating DC voltage output by the rectifier module is 52 to 250V, and the second pulsating DC voltage obtained after conversion by the primary conversion circuit 232 may be 5 to 25V, etc., but is not limited thereto. Optionally, the primary conversion circuit 232 may also be a boost circuit, which is not limited here.

[0056] The secondary conversion circuit 234 converts the second pulsating DC voltage into a stable DC voltage, which may be a constant DC voltage or an approximately constant DC voltage (with a very small amplitude), and the constant DC voltage may be a DC voltage with a fixed voltage. In some embodiments, the stable DC voltage obtained by the secondary conversion circuit 234 may be a charging voltage that meets the charging requirements of the terminal device, or may be a DC voltage that requires further voltage conversion to meet the charging requirements.

[0057] It should be noted that the conversion module 230 may also only include a single-stage conversion circuit, and is not limited to the above-mentioned two-stage conversion circuit architecture, and the embodiments of the present application are not limited to this.

[0058] The valley filling circuit 220 is used to boost the first pulsating DC voltage output by the rectifier module 210 when the voltage value of the first pulsating DC voltage is greater than the first voltage threshold, and to store energy based on the boosted first pulsating DC voltage, and to provide electric energy to the conversion module 230 when the voltage value of the first pulsating DC voltage is less than the second voltage threshold, so as to increase the valley voltage of the first pulsating DC voltage input to the conversion module 230, wherein the first voltage threshold is greater than the second voltage threshold.

[0059] The valley voltage may refer to the minimum voltage value of the first pulsating DC voltage in a voltage magnitude change cycle. In order to reduce the volume of the adapter, the second capacitor 214 uses a capacitor with a capacity less than the capacity threshold, and the valley voltage of the first pulsating DC voltage obtained by rectification is relatively low (for example, 0V, etc.). If the first pulsating DC voltage with a relatively low valley voltage is directly input to the conversion module 230, it is impossible to provide sufficient power to the subsequent circuit, and it is difficult to maintain the output of the subsequent conversion circuit, resulting in poor output voltage stability. In addition, since the valley voltage of the first pulsating DC voltage obtained by rectification is relatively low, it will cause a higher peak current in the subsequent circuit, and a larger magnetic element is required to complete the voltage conversion.

[0060] In the embodiment of the present application, a valley filling circuit 220 is provided in the power supply device 200, and the valley filling circuit 220 can switch different working modes according to the voltage value of the first pulsating DC voltage output by the rectifier module 210. When the voltage value of the first pulsating DC voltage output by the rectifier module 210 is lower than the second voltage threshold, the valley filling circuit 220 can be in a step-down discharge mode, and the valley filling circuit 220 can release electric energy to the input end of the conversion module 230 to increase the voltage of the first pulsating DC voltage input to the conversion module 230. Optionally, the second voltage threshold can be a set voltage value, for example, 50V, 45V, etc., but is not limited thereto.

[0061] When the voltage value of the first pulsating DC voltage output by the rectifier module 210 is greater than the first voltage threshold, the valley filling circuit 220 may be in a boost charging mode, and the first pulsating DC voltage output by the rectifier module 210 may be boosted, and the boosted first pulsating DC voltage may be used for charging, and the valley filling circuit 220 stores electric energy. Optionally, the first voltage threshold may be a set voltage value, and the first voltage threshold may be a voltage value close to the peak voltage of the first pulsating DC voltage. For example, the peak voltage of the first pulsating DC voltage is 220V, and the first voltage threshold may be 210V, 220V, 197V, etc., which is not limited here. It should be noted that the first voltage threshold may also be equal to the second voltage threshold, or a voltage value close to the second voltage threshold, which is not limited here.

[0062] When the first pulsating DC voltage output by the rectifier module 210 is close to the peak voltage, the valley filling circuit 220 is charged. The valley filling circuit 220 can boost the first pulsating DC voltage output by the rectifier module 210, and use the first pulsating DC voltage after the boost conversion to charge and store energy, so that more energy can be stored, which greatly improves the utilization rate of the components used for energy storage in the valley filling circuit 220.

[0063] In an embodiment of the present application, the valley filling circuit 220 may have a bidirectional energy flow function. When the valley filling circuit 220 is in a boost charging mode, the rectifier module 210 outputs a first pulsating DC voltage to the valley filling circuit 220, and the valley filling circuit 220 is charged and stores energy. When the valley filling circuit 220 is in a step-down discharge mode, the input end of the valley filling circuit 220 may become an output end, and the valley filling circuit 220 releases electrical energy to the conversion module 230.

[0064] In some embodiments, the valley filling circuit 220 can directly switch between the boost charging mode and the buck discharging mode according to the voltage value of the first pulsating DC voltage output by the rectifier module 210. When the voltage value of the first pulsating DC voltage output by the rectifier module 210 is greater than the output voltage of the valley filling circuit 220, the valley filling circuit 220 can be in the boost charging mode, and charge and store energy according to the first pulsating DC voltage output by the rectifier module 210, then the first voltage threshold mentioned above can be the output voltage of the valley filling circuit 220 after releasing electric energy. When the voltage value of the first pulsating DC voltage output by the rectifier module 210 is less than the output voltage of the valley filling circuit 220, the valley filling circuit 220 can be in the buck charging mode, and release electric energy to the conversion module 230, then the second voltage threshold mentioned above can be the output voltage of the valley filling circuit 220 after charging and without releasing electric energy. The valley filling circuit 220 can switch between the boost charging mode and the buck discharging mode by itself, without adding an additional voltage detection and judgment module to control the valley filling circuit 220 to switch between the two working modes, which can save costs.

[0065] In an embodiment of the present application, when the voltage value of the first pulsating DC voltage output by the rectifier module is greater than the first voltage threshold, the valley filling circuit boosts the first pulsating DC voltage output by the rectifier module, and stores energy based on the boosted first pulsating DC voltage. By boosting the first pulsating DC voltage, the valley filling circuit can store more electrical energy, thereby reducing the number and / or volume of energy storage devices in the valley filling circuit, thereby reducing the volume of the power supply device.

[0066] When the voltage value of the first pulsating DC voltage output by the rectifier module is less than the second voltage threshold, the valley filling circuit releases electric energy to the conversion module to increase the valley voltage of the first pulsating DC voltage input to the conversion module, so that the first pulsating DC voltage input to the conversion module has a sufficiently high valley voltage, which can provide sufficient power support for the conversion module and ensure the stability of the output voltage of the power supply device. In addition, the valley voltage of the first pulsating DC voltage is increased, which can reduce the peak current during the subsequent voltage conversion, so the size of the magnetic components in the subsequent circuit can be reduced, thereby reducing the volume of the power supply device.

[0067] like Figure 3A As shown, in one embodiment, the valley filling circuit 220 may include a first transformer unit 222 and a first capacitor 224. The first transformer unit 222 may be connected to the first capacitor 224, and the first transformer unit 222 may be connected to the output end of the rectifier module 210 and the input end of the conversion module 230 respectively.

[0068] The first voltage transformation unit 222 is used to step up the first pulsating DC voltage output by the rectifier module 210 when the voltage value of the first pulsating DC voltage is greater than a first voltage threshold, so as to charge the first capacitor 224 .

[0069] The first voltage transformation unit 222 is further used to step down the voltage of the first capacitor 224 when the voltage value of the first pulsating DC voltage is less than the second voltage threshold, so as to provide electric energy to the input end of the transformation module 230 .

[0070] The rectifier module 210 can provide an input voltage for the valley filling circuit 220. When the voltage value of the first pulsating DC voltage is greater than the first voltage threshold, the first pulsating DC voltage output by the rectifier module 210 can be boosted by the first transformer unit 222, and the first capacitor 224 is charged after the boosting, and the first capacitor 224 stores electric energy. Optionally, the first voltage threshold can be close to the peak voltage of the first pulsating DC voltage, so that the first capacitor 224 can store more electric energy and improve the utilization rate of the first capacitor 224. For example, the peak voltage of the first pulsating DC voltage is 220V, the first voltage threshold is 200V, and the voltage of the first capacitor 224 can reach up to about 400V. While increasing the storage of electric energy, the number of the first capacitor 224 can be reduced, further reducing the volume of the power supply device.

[0071] When the voltage value of the first pulsating DC voltage is less than the second voltage threshold, it can be indicated that the first pulsating DC voltage output by the rectifier module 210 is about to or has entered the valley stage, and the first capacitor 224 can release electric energy to the input end of the conversion module 230 through the first voltage transformation unit 222. Further, the first voltage transformation unit 222 can be connected to the second capacitor 214 of the rectifier module 210, and the first voltage transformation unit 222 reduces the voltage output by the first capacitor 224, and then inputs the reduced voltage to the second capacitor 214, thereby increasing the first pulsating DC voltage obtained by the second capacitor 214. Further, the valley voltage of the first pulsating DC voltage obtained by the second capacitor 214 can be maintained at a constant voltage value (the constant voltage value can be the second voltage threshold mentioned above, or can be less than the second voltage threshold and greater than the valley voltage when the valley filling circuit 220 is not provided), thereby increasing the valley voltage of the first pulsating DC voltage input to the conversion module 230.

[0072] In some embodiments, the first transformer unit 222 is also used to step up the first pulsating DC voltage output by the rectifier module 210 when the voltage value of the first pulsating DC voltage rises to a first voltage threshold so as to charge the first capacitor 224; and to step down the voltage of the first capacitor when the voltage value of the first pulsating DC voltage drops to a second voltage threshold so as to provide electrical energy to the input end of the transformation module 230.

[0073] The first pulsating DC voltage output by the rectifier module 210 is a voltage that pulsates according to a certain rule. When the first pulsating DC voltage rises from the valley voltage and rises to the first voltage threshold, the first transformer unit 222 can switch to the boost circuit, and perform a boost conversion on the first pulsating DC voltage output by the rectifier module 210 in the boost working mode, thereby charging the first capacitor 224. When the first pulsating DC voltage drops from the peak voltage and drops to the second voltage threshold, the first transformer unit 222 can switch to the buck circuit, and perform a buck conversion on the voltage of the first capacitor 224 in the buck working mode, thereby providing electrical energy to the second capacitor 214 of the rectifier module 210, and maintaining the valley voltage of the first pulsating DC voltage at a constant voltage value.

[0074] Optionally, the first capacitor 224 may include any one of a ceramic capacitor, a film capacitor, an electrolytic capacitor with a capacity less than a capacity threshold, etc. The ceramic capacitor may include an MLCC capacitor, etc., but is not limited thereto. By using a first capacitor with a smaller capacity, the volume of the first capacitor can be reduced, thereby reducing the volume of the entire power supply device 200, thereby improving the portability of the power supply device 200.

[0075] In some embodiments, the first voltage transformation unit 222 may include a switch subunit, which is used to be in a first conduction state when the voltage value of the first pulsating DC voltage is greater than a first voltage threshold, so that the first voltage transformation unit 222 performs a step-up conversion on the first pulsating DC voltage output by the rectifier module 210 to charge the first capacitor 224. The switch subunit is also used to be in a second conduction state when the voltage value of the first pulsating DC voltage is less than a second voltage threshold, so that the first voltage transformation unit 222 performs a step-down conversion on the voltage of the first capacitor 224 to provide electrical energy to the input end of the conversion module 230.

[0076] When the first voltage transformation unit 222 is in the boost operation mode, the switch subunit may be in the first conduction state, and when the first voltage transformation unit 222 is in the buck operation mode, the switch subunit may be in the second conduction state.

[0077] In some embodiments, the valley filling circuit 220 may be a bidirectional DC / DC (direct current / direct current) conversion circuit. Figure 3BAs shown, the switch subunit may include a first switch Qv_H and a second switch Qv_L, and the first transformer unit 222 may also include a first inductor L1, a first diode BD1 and a second diode BD2. The first switch Qv_H is connected in parallel with the first diode BD1, the second switch Qv_L is connected in parallel with the second diode BD2, the cathode of the first diode BD1 is connected to one end of the first capacitor C1, the anode of the first diode BD1 is connected to one end of the first inductor, the anode of the second diode BD2 is connected to the other end of the first capacitor C1, and the cathode of the second diode BD2 is connected to one end of the first inductor L1. The other end of the first inductor L1 may be connected to the second capacitor C2 of the rectifier module 210. Further, the other end of the first capacitor C1 may also be grounded.

[0078] Optionally, the first conduction state of the above-mentioned switch subunit may include the first switch Qv_H being in the off state, and the second switch Qv_L switching between the off state and the on state according to the first frequency. When the switch subunit is in the first conduction state, the first inductor L1, the first diode BD1 and the second switch Qv_L form a boost circuit. The first pulsating DC voltage output by the rectifier module 210 can charge the first capacitor C1 through the boost circuit. The first frequency can be set according to actual needs, and the second switch Qv_L continuously switches between on and off at a high frequency. The first inductor L1 is connected to the input end of the valley filling circuit 220. The first inductor L1 can be used as a boost inductor, so that the first pulsating DC voltage output by the rectifier module 210 can be boosted and converted to obtain an energy storage voltage. The voltage value of the energy storage voltage is greater than the voltage value of the first pulsating DC voltage, so that the first capacitor C1 is charged by the energy storage voltage.

[0079] Optionally, the second conduction state of the above-mentioned switch subunit may include the first switch Qv_H switching between the disconnection state and the conduction state according to the second frequency, and the second switch Qv_L is in the disconnection state. When the switch subunit is in the second conduction state, the first inductor L1, the second diode BD2 and the first switch Qv_H form a buck step-down circuit. The first capacitor C1 can release energy to the input end of the second capacitor C2 through the buck step-down circuit to pump up the valley voltage of the first pulsating DC voltage output by the rectifier module 210. The second frequency can be set according to actual needs, and the second frequency can be the same as or different from the first frequency, which is not limited here. The first switch Qv_H is continuously switched between conduction and disconnection at a high frequency, and the voltage output by the second capacitor C2 is chopped and modulated. The first inductor L1 is connected to the output end of the valley filling circuit 220. The first inductor L1 can reduce the pulsation of the voltage after the first switch Qv_H is chopped and modulated to obtain the output voltage. The voltage value of the output voltage is less than or equal to the voltage value of the second capacitor C2, so that the output voltage provides electrical energy to the second capacitor C2.

[0080] When the valley filling circuit 220 charges the second capacitor C2, the first inductor L1 and the second capacitor C2 can form a first-stage LC filter, which can reduce the voltage ripple output by the valley filling circuit 220, so that the voltage output by the valley filling circuit 220 to the second capacitor C2 is a stable DC voltage, which can better maintain the voltage value of the first pulsating DC voltage at a constant voltage value.

[0081] Further, the first voltage conversion unit 222 is also used for providing electric energy to the input end of the conversion module 230 through the output voltage after the switch subunit switches to the second conduction state, when the voltage value of the first pulsating DC voltage is less than the output voltage of the first voltage conversion unit 222. When the voltage value of the first pulsating DC voltage drops to the second voltage threshold, the switch subunit switches to the second conduction state, and the first voltage conversion unit 222 switches to the buck step-down working mode. At this time, the voltage value of the first pulsating DC voltage may still be greater than the output voltage of the buck step-down circuit, then the valley filling circuit 220 performs pre-starting, and when the voltage value of the first pulsating DC voltage is less than the output voltage of the buck step-down circuit, the first capacitor C1 releases electric energy to the second capacitor C2 through the buck step-down circuit. Through the pre-starting stage of the valley filling circuit 220, it can be ensured that the first pulsating DC voltage can obtain electric energy as soon as it enters the valley stage, and the valley voltage is maintained at a constant voltage value to ensure the power of the conversion module 230.

[0082] In some embodiments, the first transformer unit 222 is also used to step down the voltage of the first capacitor 224 to provide electrical energy to the input end of the conversion module 230. When the voltage value of the first pulsating DC voltage is greater than or equal to the output voltage of the first transformer unit 222 and less than the first voltage threshold, the first transformer unit 222 stops working, the first switch Qv_H and the second switch Qv_L are both in the disconnected state, and the first pulsating DC voltage output by the rectifier module 210 charges the first capacitor 224 through the first diode BD1.

[0083] After the first capacitor 224 in the valley filling circuit 220 provides electric energy to the input end of the conversion module 230 through the buck step-down circuit, the valley voltage of the first pulsating DC voltage is maintained at a constant voltage value. When the first pulsating DC voltage starts to rise, and the voltage value of the first pulsating DC voltage is greater than or equal to the output voltage of the valley filling circuit 220, the valley filling circuit 220 can stop working. The first switch Qv_H and the second switch Qv_L of the first voltage conversion unit 222 can both be in the disconnected state, and the power output of the conversion module 230 is maintained by the rectifier module 210. At this time, since the voltage value of the first pulsating DC voltage is greater than or equal to the output voltage of the valley filling circuit 220, that is, the voltage value of the first pulsating DC voltage is greater than or equal to the voltage of the first capacitor C1, the first diode BD1 is turned on, and the first pulsating DC voltage output by the rectifier module 210 can charge the first capacitor C1 through the first diode BD1.

[0084] The first pulsating DC voltage continues to rise, and when it reaches the first voltage threshold, the valley filling circuit 220 can start working, the switch subunit of the first transformer unit 222 is switched to the first conduction state, the second switch Qv_L can be turned on and off at a high frequency, the first inductor L1, the first diode BD1 and the second switch Qv_L form a boost circuit, and the first pulsating DC voltage output by the rectifier module 210 continues to charge the first capacitor C1 through the boost circuit.

[0085] In some embodiments, the first transformer unit 222 is also used to boost the first pulsating DC voltage output by the rectifier module 210 to charge the first capacitor 224. When the voltage value of the first pulsating DC voltage drops to a third voltage threshold, the transformer stops working, the first switch Qv_H and the second switch Qv_L are both in a disconnected state, and the first capacitor 224 stores electrical energy and maintains voltage, wherein the third voltage threshold is greater than the second voltage threshold and less than or equal to the first voltage threshold.

[0086] After the first pulsating DC voltage output by the rectifier module 210 charges the first capacitor C1 through the boost circuit of the valley filling circuit 220, the first pulsating DC voltage reaches the peak voltage and starts to decrease. When the voltage value of the first pulsating DC voltage decreases to the third voltage threshold, the valley filling circuit 220 can stop working. The first switch Qv_H and the second switch Qv_L of the first transformer unit 222 can both be in the disconnected state, and the first capacitor C1 stores energy and maintains the voltage.

[0087] The first pulsating DC voltage continues to drop, and when it drops to the second voltage threshold, the valley filling circuit 220 can start working, the switch subunit of the first transformer unit 222 is switched to the second conduction state, the first switch Qv_H is turned on and off at a high frequency, and the first inductor L1, the second diode BD2 and the first switch Qv_H form a buck step-down circuit. The voltage of the first capacitor C1 charges the second capacitor C2 of the rectifier module 210 through the buck step-down circuit to maintain the valley voltage of the first pulsating DC voltage at a constant voltage value. When the first pulsating DC voltage starts to rise and the voltage value of the first pulsating DC voltage is greater than or equal to the output voltage of the valley filling circuit 220, the valley filling circuit 220 can stop working, and the above process can be repeated continuously.

[0088] In the embodiment of the present application, the valley filling circuit 220 works synchronously and can flow in both directions. By switching the first voltage conversion unit 222 to the boost working mode, the first capacitor C1 can obtain a higher voltage, so that more energy can be stored, which greatly improves the utilization rate of the first capacitor C1. And the first capacitor C1 can be used to the maximum extent for energy storage in the high and low voltage sections of the first pulsating DC voltage. The number of energy storage capacitors in the valley filling circuit 220 can be effectively reduced (such as from more than 4 to 2), and the circuit is streamlined, the volume of the power supply device is reduced, and the cost is reduced. In addition, since the valley filling circuit 220 adopts a non-isolated solution, the efficiency of valley filling energy utilization is improved.

[0089] It should be noted that the valley filling circuit 220 may also be other bidirectional DC / DC conversion circuit topology structures, and is not limited to Figure 3B The valley filling circuit 220 may also include a structure relative to Figure 3B There are more or fewer components in the invention, and there is no limitation on this.

[0090] In some embodiments, Figure 3C As shown, the above-mentioned power supply device 200 may also include a detection module 240 and a control module 250. The detection module 240 may be connected to the control module 250. The detection module 240 may be connected to the output end of the rectifier module 210 (i.e., the input end of the conversion module), and the control module 250 may be connected to the first transformer unit 222.

[0091] The detection module 240 is used to detect the voltage value of the first pulsating DC voltage outputted from the output end of the rectifier module.

[0092] The control module 250 is used to control the switch subunit to switch to the first conduction state when the voltage value of the first pulsating DC voltage detected by the detection module 240 rises to the first voltage threshold, and to control the switch subunit to switch to the second conduction state when the voltage value of the first pulsating DC voltage detected by the detection module 240 drops to the second voltage threshold.

[0093] The detection module 240 can perform voltage sampling on the first pulsating DC voltage output by the rectifier module 210, collect the voltage value of the first pulsating DC voltage, and generate a detection signal according to the voltage value. As an optional implementation, the detection signal can be the voltage value of the first pulsating DC voltage. For example, the detection module 240 includes a voltage dividing resistor, and the first pulsating DC voltage is sampled by a resistor voltage dividing method to generate a detection signal. Alternatively, the detection module 240 includes a voltage detection chip, and the voltage detection chip is used to detect the voltage value of the first pulsating DC voltage.

[0094] When the control module 250 receives the detection signal, it can determine the voltage value of the first pulsating DC voltage according to the detection signal, and determine the voltage change trend of the first pulsating DC voltage. If the first pulsating DC voltage is on an upward trend, it can be further determined whether the voltage value of the first pulsating DC voltage reaches the first voltage threshold. If it reaches, the control module 250 can send a first switching instruction to the switch subunit of the first transformer unit 222, and the first switching instruction is used to control the switch subunit to switch to the first conduction state. If the first pulsating DC voltage is on a downward trend, it can be further determined whether the voltage value of the first pulsating DC voltage reaches the second voltage threshold. If it reaches the second voltage threshold, the control module 250 can send a second switching instruction to the switch subunit of the first transformer unit 222, and the second switching instruction is used to control the switch subunit to switch to the second conduction state.

[0095] As an implementation mode, the control module 250 may be connected to the first switch Qv_H and the second switch Qv_L. The first switch Qv_H and the second switch Qv_L may be initially in the off state. When the control module 250 detects that the first pulsating DC voltage output by the rectifier module 210 is on an upward trend and the voltage value of the first pulsating DC voltage reaches the first voltage threshold, the first switching instruction may be sent to the second switch Qv_L. According to the first switching instruction, the second switch Qv_L is controlled to switch between the off state and the on state according to the first frequency, and the first transformer unit 222 is switched to a boost circuit. The first pulsating DC voltage output by the rectifier module 210 charges the first capacitor C1 through the boost circuit of the valley filling circuit 220.

[0096] When the control module 250 detects that the first pulsating DC voltage output by the rectifier module 210 is in a downward trend and the voltage value of the first pulsating DC voltage reaches the third voltage threshold, a shutdown instruction can be sent to the second switch Qv_L, and the first switch Qv_H and the second switch Qv_L are both in the off state. When the control module 250 detects that the first pulsating DC voltage output by the rectifier module 210 continues to decrease and reaches the second voltage threshold, a second switching instruction can be sent to the first switch Qv_H, and the first switch Qv_H is controlled to switch between the off state and the on state according to the second switching instruction according to the second frequency, and the first transformer unit 222 is switched to a buck step-down circuit. The first capacitor C1 inputs electrical energy to the input end of the conversion module 230 through the buck step-down circuit of the valley filling circuit 220.

[0097] When the control module 250 detects that the first pulsating DC voltage output by the rectifier module 210 is on an upward trend and the voltage value of the first pulsating DC voltage is the same as the output voltage of the buck step-down circuit, a shutdown instruction may be sent to the first switch Qv_H, and at this time, both the first switch Qv_H and the second switch Qv_L are in the off state. The first pulsating DC voltage output by the rectifier module 210 charges the first capacitor C1 via the first diode BD1.

[0098] In the embodiment of the present application, the detection module 240 and the control module 250 can accurately control the valley filling circuit 220 to switch between different working modes, thereby ensuring the stability and accuracy of the valley filling circuit 220.

[0099] Figure 4 Schematic diagram of the waveform of the first pulsating DC voltage in one embodiment. Please refer to the Vrec curve 410 in (a), which represents the first pulsating DC voltage (i.e., the first pulsating DC voltage output by the rectifier module 210) input to the conversion module 230 when the valley filling circuit 220 is not provided in the power supply device 200. Through the Vrec curve 410, it can be known that when the valley filling circuit 220 is not provided, the valley voltage of the first pulsating DC voltage input to the conversion module 230 is 0V. Please refer to the Vrec_in curve 440 in (b), which represents the first pulsating DC voltage input to the conversion module 230 after the valley filling circuit 220 is provided in the power supply device 200. From the Vrec_in curve 440 , it can be known that when the valley filling circuit 220 is provided, the valley voltage of the first pulsating DC voltage input to the conversion module 230 is 70V, and the valley filling circuit 220 can increase the valley voltage of the first pulsating DC voltage from 0V to 70V.

[0100] Further, please refer to the V_C1 curve 430 in (b), which represents the voltage of the first capacitor 224 in the valley filling circuit 220. Each working cycle of the valley filling circuit 220 may include time t0 to time t5. At time t0, the first pulsating DC voltage rises to a peak close to the wave peak, that is, the first pulsating DC voltage is greater than the first voltage threshold, then the first switch Qv_H of the valley filling circuit 220 remains disconnected (or synchronously complements with the second switch Qv_L), and the second switch Qv_L switches between disconnection and conduction at a high frequency. The first inductor L1, the first diode BD1 and the second switch Qv_L form a boost circuit, and the first pulsating DC voltage charges the first capacitor C1 through the boost circuit, and the first capacitor C1 can store more electrical energy (close to twice the peak voltage 220V of the first pulsating DC voltage, about 400V). At time t1, the first pulsating DC voltage passes through the peak and begins to drop, and when it drops to the third voltage threshold, the first switch Qv_H and the second switch Qv_L remain disconnected, and the first capacitor C1 maintains the voltage. At time t2, when the first pulsating DC voltage drops to a lower second voltage threshold, the second switch Qv_L remains disconnected (or continues to flow synchronously with the first switch Qv_H), and the first switch Qv_H switches between disconnection and conduction at a high frequency. The first inductor L1, the second diode BD2 and the first switch Qv_H form a buck step-down circuit. In the stage from time t2 to time t3, the first pulsating DC voltage is higher than the output voltage of the valley filling circuit 220. Therefore, the power output is also maintained by the rectifier module 210, and the valley filling circuit 220 is in the pre-startup stage. At time t3, the first pulsating DC voltage is less than the output voltage of the valley filling circuit 220, and the first capacitor C1 releases energy through the buck step-down circuit, pumping up the valley voltage of the first pulsating DC voltage to maintain it at a constant voltage value output. In the stage t3-t4, the rectifier module 210 and the valley filling circuit 220 jointly maintain the power output. After passing the valley point, the first pulsating DC voltage begins to rise, and at time t4 it rises to the same as the output voltage of the valley filling circuit 220, and the rectifier module 210 begins to maintain the power output. At time t5, the valley filling circuit 220 can stop working, the first switch Qv_H and the second switch Qv_L remain disconnected, and the first pulsating DC voltage can charge the first capacitor C1 through the first diode BD1. At time t6, the valley filling circuit 220 can start a new working cycle.

[0101] Optionally, some of the above-mentioned time points may overlap, for example, time t2 may overlap with time t3, and when the first pulsating DC voltage is less than the output voltage of the valley filling circuit 220, the valley filling circuit 220 may be started again; time t4 may overlap with time t5, and when the first pulsating DC voltage rises to the same as the output voltage of the valley filling circuit 220, the valley filling circuit 220 may stop working.

[0102] It should be noted that Figure 4 Only one possible waveform and voltage value of the first pulsating DC voltage and the voltage of the first capacitor C1 are shown, which is only used to illustrate the embodiment of the present application and does not limit the specific waveform and voltage value of the first pulsating DC voltage and the voltage of the first capacitor C1 in the embodiment of the present application.

[0103] like Figure 5A As shown, in one embodiment, the primary conversion circuit 232 may include a switch unit 502 and a second transformer unit 504 , the switch unit 502 may be connected to the second transformer unit 504 , and the switch unit 502 is connected to the output end of the rectifier module 210 .

[0104] The switch unit 502 is used to perform chopping modulation on the input first pulsating DC voltage to obtain a modulated voltage.

[0105] The second voltage transformation unit 504 is used to transform and rectify the modulated voltage to obtain a second pulsating DC voltage.

[0106] In one embodiment, the switch unit 502 may include at least 4 switch devices to form a switch network that supports full-bridge and half-bridge operating modes. The switch unit 502 is also used to switch to the half-bridge operating mode when the voltage value of the input first pulsating DC voltage is higher than the fourth voltage threshold, and to switch to the full-bridge operating mode when the voltage effective value of the input first pulsating DC voltage is lower than the fifth voltage threshold. The fourth voltage threshold is greater than the fifth voltage threshold. Optionally, the switch device may be a power switch device, which may include a MOSFET tube (Metal-Oxide-Semiconductor Field-Effect Transistor), a GaN (gallium nitride) switch device, etc., but is not limited to this.

[0107] As a specific implementation, the switch unit 502 can be connected to the control module 250, and the detection module 240 can perform voltage sampling on the first pulsating DC voltage input to the primary conversion circuit 232 to detect the voltage value of the first pulsating DC voltage. The manner in which the detection module 240 detects the voltage value of the first pulsating DC voltage can refer to the relevant description in the above embodiment, which will not be repeated here. The control module 250 is also used to control the switch unit 502 to switch to the half-bridge working mode when the voltage value of the first pulsating DC voltage detected by the detection module 240 is higher than the fourth voltage threshold, and to control the switch unit 502 to switch to the full-bridge working mode when the voltage effective value of the first pulsating DC voltage detected by the detection module 240 is lower than the fifth voltage threshold.

[0108] When it is detected that the voltage value of the first pulsating DC voltage is higher than the fourth voltage threshold, it can be said that the first pulsating DC voltage belongs to the high voltage range. When it is detected that the voltage effective value of the first pulsating DC voltage is lower than the fifth voltage threshold, it can be said that the first pulsating DC voltage belongs to the low voltage range. Optionally, in addition to the voltage effective value, the peak voltage, average voltage, etc. of the first pulsating DC voltage can also be detected to determine whether it is lower than the fifth voltage threshold, which is not limited to the voltage effective value, wherein the peak voltage refers to the maximum voltage value of the first pulsating DC voltage in a voltage magnitude change cycle. Among them, the maximum voltage in the high voltage range may be higher than the maximum voltage in the low voltage range. For example, the high voltage range may be 150 to 220V, and the low voltage range may be 45 to 130V, etc., but not limited thereto. When the input first pulsating DC voltage is in the high voltage range, the second switch module can operate in half-bridge mode, and when the input second pulsating DC voltage is in the low voltage range, the second switch module can operate in full-bridge mode. This ensures that when the input first pulsating DC voltage changes in a wide range, the change of the second pulsating DC voltage output by the first-stage conversion circuit 232 can be maintained within a narrow range, which is convenient for the design and voltage conversion of the subsequent second-stage conversion circuit 234.

[0109] Figure 5B FIG. 1 is a schematic diagram of the structure of a power supply device in another embodiment. Figure 5B As shown, the switch unit 502 may include four switch devices, namely switch Q1, switch Q2, switch Q3 and switch Q4. When the switch unit 502 is in the half-bridge working mode, the switch Q1 and the switch Q2 may work. When the second switch unit 502 is in the full-bridge working mode, the four switch devices may work together. The control module 250 may send control signals to the switch Q1, the switch Q2, the switch Q3 and the switch Q4 respectively to control the on / off of the switch Q1, the switch Q2, the switch Q3 and the switch Q4 respectively. Optionally, the control signal may be a pulse signal, etc. For example, when the switch unit 502 is in the half-bridge working mode, the control module 250 may only send a drive signal to the switch Q1 and the switch Q2 to control the switch Q1 and the switch Q2 to switch between the on state and the off state. At the same time, the control module 250 may control the switch Q3 to remain in the off state and control the switch Q4 to remain in the on state.

[0110] The second voltage transformation unit 504 may include a transformer 506, a switch SR1, a switch SR2, and a third capacitor C3 and a fourth capacitor C4. The switch unit 502 performs chopping modulation on the input first pulsating DC voltage (i.e., V_in). The transformer 506 may include a primary winding n1, a secondary winding n2, and a secondary winding n3. The transformer 506 may transform the modulation voltage. Further, the transformer 506 may step down the modulation voltage, and then filter it through the third capacitor C3 and the fourth capacitor C4, thereby obtaining a second pulsating DC voltage (i.e., V_bus) with less fluctuation. The second pulsating DC voltage may be input to the secondary conversion circuit 234 for voltage conversion.

[0111] In some embodiments, the primary conversion circuit 232 may be a DC transformer based on an LLC resonant converter. The primary conversion circuit 232 may also include a resonant capacitor Cr, a resonant inductor Lr, and an excitation inductor Lm. The resonant capacitor Cr, the resonant inductor Lr, and the excitation inductor Lm may constitute a resonant network. The resonant capacitor Cr can prevent the transformer 506 from entering a saturation state, thereby realizing efficient isolation conversion of the first pulsating DC voltage.

[0112] The switches SR1 and SR2 may be used to rectify the voltage output by the transformer 506. Optionally, the control module 250 may further send a control signal to the switches SR1 and SR2 to control the on / off of the switches SR1 and SR2. By controlling the on and off of the switches SR1 and SR2, the output power of the transformer 506 may be adjusted so that the obtained second pulsating DC voltage meets the demand.

[0113] It should be noted that Figure 5B Only one circuit structure implementation of the primary conversion circuit 232 is shown. The primary conversion circuit 232 may also be other circuit topology structures, and may also include Figure 5B There may be more or fewer components, and the embodiments of the present application do not specifically limit this.

[0114] In the embodiment of the present application, the valley voltage of the first pulsating DC voltage input to the first-stage conversion circuit 232 can be increased by the valley filling circuit 220, so that the valley voltage of the second pulsating DC voltage output by the first-stage conversion circuit 232 is also increased, and the fluctuation of the output second pulsating DC voltage is smaller, which can be more conveniently performed by the second-stage conversion circuit 234 for voltage conversion, and the circuit design of the second-stage conversion circuit 234 can also be made simpler.

[0115] In some embodiments, the secondary conversion circuit 234 may include a DC / DC conversion circuit (DC / DC circuit), and the secondary conversion circuit 234 may convert the second pulsating DC voltage output by the primary conversion circuit 232 into a stable DC voltage and output it. Optionally, the secondary conversion circuit 234 may include a Buck-Boost circuit, and the Buck-Boost circuit may convert the second pulsating DC voltage higher than the target voltage or lower than the target voltage into a stable DC voltage, and the DC voltage may be a constant DC voltage with a voltage value of the target voltage. It should be noted that the constant DC voltage referred to in this application may also be a DC voltage with a certain fluctuation.

[0116] For example, Figure 6 FIG. 1 is a schematic diagram of the connection structure of a Buck-Boost circuit in one embodiment. Figure 6 As shown, in one embodiment, the secondary conversion circuit 234 may include a Buck-Boost circuit 602, and the power supply device 200 may further include a voltage sampling module 260, which may be connected to the output end of the primary conversion circuit 232, the output end of the Buck-Boost circuit 602, and the control module 250 respectively. The voltage sampling module 260 may detect the voltage value of the second pulsating DC voltage output by the primary conversion circuit 232, detect the output voltage of the Buck-Boost circuit 602, and output a feedback signal to the control module 250. The control module 250 may receive the feedback signal output by the voltage sampling module 260, and obtain the voltage value of the second pulsating DC voltage and the output voltage of the Buck-Boost circuit 602 according to the feedback signal, and may compare the voltage value of the second pulsating DC voltage with the output voltage of the Buck-Boost circuit 602, and control the working mode of the Buck-Boost circuit 602 according to the comparison result. The control module 250 can accurately control the working mode switching of the Buck-Boost circuit 602, so that the output DC voltage is more stable and accurate, and the Buck-Boost circuit 602 only works in one mode, which can save power consumption.

[0117] The working mode of the Buck-Boost circuit 602 may include a Buck circuit mode and a Boost circuit mode. When the control module 250 detects that the voltage value of the second pulsating DC voltage is greater than the output voltage of the Buck-Boost circuit 602, the control module 250 may control the Buck-Boost circuit 602 to switch to the Buck circuit mode. When the control module 250 detects that the voltage value of the second pulsating DC voltage is less than the output voltage of the Buck-Boost circuit 602, the control module 250 may control the Buck-Boost circuit 602 to switch to the Boost circuit mode.

[0118] For example, Figure 7 FIG. 1 is a schematic diagram of the structure of a Buck-Boost circuit in one embodiment. Figure 7 As shown, the Buck-Boost circuit 602 may include a switch device S1, a switch device S2, a switch device S3, a switch device S4, an inductor LB, a capacitor C5 and a capacitor Co, wherein the capacitor C5 and the capacitor Co may be used to filter the output voltage so as to keep the output voltage stable. When the Buck-Boost circuit 602 operates in the Buck circuit mode, the switch device S3 is always closed, the switch device S4 is always disconnected, and the switch devices S1, S1 and S2 switch the on state and the off state at a high frequency, and the second pulsating DC voltage (i.e., V_bus) input by the Buck-Boost circuit 602 and the inductor LB may jointly provide electrical energy to the output end. After the switch device S1 is disconnected and the switch device S2 is turned on, a freewheeling loop may be provided to the inductor LB. By switching the on state and the closed state of the switch device S1 and the switch device S2, the chopping modulation of the second pulsating DC voltage is realized to obtain a stable DC voltage.

[0119] When the Buck-Boost circuit 602 operates in the Boost circuit mode, the switch device S1 is always closed, the switch device S2 is always disconnected, and the switch devices S3 and S4 switch the on state and the off state at a high frequency. When the switch device S4 is turned on and the switch device S3 is disconnected, the second pulsating DC voltage (i.e., V_bus) can charge the inductor LB. When the switch device S3 is turned on and the switch device S4 is disconnected, the second pulsating DC voltage (i.e., V_bus) and the inductor LB can jointly provide electrical energy to the output terminal. By switching the on state and the closed state of the switch device S3 and the switch device S4, the chopping modulation of the second pulsating DC voltage is realized to obtain a stable DC voltage.

[0120] It should be noted that the switch devices S1, S2, S3, and S4 may be diodes, MOS tubes, and other switch devices, which are not limited here. The Buck-Boost circuit 602 may also be other circuit topologies, and is not limited to Figure 7 The structure shown in . Buck-Boost circuit 602 can also perform voltage comparison by itself to adjust the working mode and the on / off of each switch device, that is, the control module 250 and the voltage sampling module 260 mentioned above are not necessary for the Buck-Boost circuit. The secondary conversion circuit 234 can also be other DC / DC circuits, not limited to the above-mentioned Buck-Boost circuit.

[0121] In the embodiment of the present application, a two-stage circuit architecture is used to transform the rectified pulsating DC voltage to obtain a stable DC voltage, which can ensure that the DC voltage output by the power supply device is more stable. Moreover, after the valley voltage of the first pulsating DC voltage is increased, the valley voltage of the second pulsating DC voltage input to the secondary conversion circuit is also increased, which can reduce the peak current of the secondary conversion circuit, thereby reducing the size of the magnetic components of the secondary conversion circuit, thereby reducing the volume of the power supply device.

[0122] Furthermore, the third capacitor C3, the fourth capacitor C4, the capacitor C5, etc. in the embodiment of the present application can all be capacitors with a capacity less than a capacity threshold, thereby making the entire power supply device more compact, effectively reducing the volume of the power supply device, and improving the portability of the power supply device.

[0123] The valley filling circuit in the embodiment of the present application is used to increase the valley voltage of the first pulsating DC voltage input to the primary conversion circuit. Compared with first converting the first pulsating DC voltage through the primary conversion circuit to obtain the second pulsating DC voltage, and then using the valley filling circuit to increase the valley voltage of the second pulsating DC voltage, or after the secondary conversion circuit outputs a stable DC voltage, using the valley filling circuit to increase the valley voltage of the DC voltage output by the secondary conversion circuit, the valley filling circuit in the embodiment of the present application is more efficient because the valley filling circuit directly increases the valley voltage of the first pulsating DC voltage input to the primary conversion circuit, and the voltage output by the valley filling circuit can be higher, so the efficiency is better.

[0124] like Figure 8 As shown, in one embodiment, a charging method is provided, which can be applied to the power supply device 200 described in the above embodiments. The method may include the following steps:

[0125] Step 810: rectify the received AC voltage through a rectifying module to obtain a first pulsating DC voltage.

[0126] Step 820: transform the first pulsating DC voltage through a transformation module to obtain a stable DC voltage.

[0127] Step 830, when the voltage value of the first pulsating DC voltage is greater than the first voltage threshold, the first pulsating DC voltage output by the rectifier module is boosted by the valley filling circuit, and the valley filling circuit is charged based on the boosted first pulsating DC voltage.

[0128] Step 840, when the voltage value of the first pulsating DC voltage is less than the second voltage threshold, the valley filling circuit provides power to the conversion module to increase the valley voltage of the first pulsating DC voltage input to the conversion module. The first voltage threshold is greater than the second voltage threshold.

[0129] In an embodiment of the present application, when the voltage value of the first pulsating DC voltage output by the rectifier module is greater than the first voltage threshold, the valley filling circuit boosts the first pulsating DC voltage output by the rectifier module, and stores energy based on the boosted first pulsating DC voltage. By boosting the first pulsating DC voltage, the valley filling circuit can store more electric energy, thereby reducing the number and / or volume of energy storage devices in the valley filling circuit, thereby reducing the volume of the power supply device. When the voltage value of the first pulsating DC voltage output by the rectifier module is less than the second voltage threshold, the valley filling circuit releases electric energy to the conversion module to increase the valley voltage of the first pulsating DC voltage input to the conversion module, so that the first pulsating DC voltage input to the conversion module has a sufficiently high valley voltage, which can provide sufficient power support for the conversion module, and ensure the stability of the output voltage of the power supply device. In addition, the valley voltage of the first pulsating DC voltage is increased, which can reduce the peak current during the subsequent voltage conversion, so that the size of the magnetic components in the subsequent circuit can be reduced, thereby reducing the volume of the power supply device.

[0130] In one embodiment, the valley filling circuit includes a first voltage transformation unit and a first capacitor. Step 830 includes: when the voltage value of the first pulsating DC voltage is greater than the first voltage threshold, the first voltage transformation unit performs a voltage boost transformation on the first pulsating DC voltage output by the rectifier module to charge the first capacitor.

[0131] Step 840 includes: when the voltage value of the first pulsating DC voltage is less than the second voltage threshold, performing a step-down conversion on the voltage of the first capacitor by the first voltage conversion unit to provide electric energy to the input end of the conversion module.

[0132] In one embodiment, Fig. 9 As shown, the first voltage transformation unit may include a switch subunit, and the operation process of the valley filling circuit may include the following steps:

[0133] Step 902: When the voltage value of the first pulsating DC voltage rises to a first voltage threshold, the switch subunit of the first transformer unit is switched to a first conducting state.

[0134] Step 904: Perform a voltage-boosting conversion on the first pulsating DC voltage output by the rectifier module by means of a first voltage transformation unit, so as to charge the first capacitor.

[0135] In one embodiment, after step 904, it also includes: when the voltage value of the first pulsating DC voltage drops to a third voltage threshold, controlling the first switch and the second switch to be in a disconnected state, the first transformer unit stops working, and the first capacitor stores electrical energy and maintains the voltage, wherein the third voltage threshold is greater than the second voltage threshold and less than or equal to the first voltage threshold.

[0136] Step 906: When the voltage value of the first pulsating DC voltage drops to a second voltage threshold, the switch subunit of the first transformer unit is switched to a second conduction state.

[0137] Step 908: performing a step-down conversion on the voltage of the first capacitor by the first voltage conversion unit to provide electric energy to the input end of the conversion module.

[0138] In one embodiment, step 908 includes: when the voltage value of the first pulsating DC voltage is less than the output voltage of the first transformer unit, providing electric energy to the input terminal of the transformation module through the output voltage.

[0139] Step 910, when the voltage value of the first pulsating DC voltage is greater than or equal to the output voltage of the first transformer unit and is less than the first voltage threshold, the first switch and the second switch are controlled to be in the disconnected state, the first transformer unit stops working, and the first pulsating DC voltage output by the rectifier module is input to the first capacitor through the first diode to charge the first capacitor.

[0140] After executing step 910 , the valley filling circuit may continue to execute step 902 , and its working process may be a cycle process of steps 902 to 910 .

[0141] In an embodiment of the present application, the valley filling circuit works synchronously and can flow in both directions. By switching the first transformer unit to the boost working mode, the first capacitor can obtain a higher voltage, so that more energy can be stored, which greatly improves the utilization rate of the first capacitor. And the first capacitor can be used to the maximum extent for energy storage in the high and low voltage sections of the first pulsating DC voltage. The number of energy storage capacitors in the valley filling circuit can be effectively reduced (such as from more than 4 to 2), and the circuit is streamlined, the volume of the power supply device is reduced, and the cost is reduced. In addition, since the valley filling circuit adopts a non-isolated solution, the efficiency of valley filling energy utilization is improved.

[0142] In one embodiment, the conversion module includes a primary conversion circuit and a secondary conversion circuit.

[0143] Step 820 includes: isolating and transforming the first pulsating DC voltage through a primary conversion circuit to obtain a second pulsating DC voltage; and transforming the second pulsating DC voltage through a secondary conversion circuit to obtain a stable DC voltage.

[0144] In one embodiment, the primary conversion circuit includes a second voltage conversion unit and a switch unit. The step of isolating and converting the first pulsating DC voltage through the primary conversion circuit to obtain the second pulsating DC voltage includes: chopping and modulating the input first pulsating DC voltage through the switch unit to obtain a modulated voltage; and transforming and rectifying the modulated voltage through the second voltage conversion unit to obtain the second pulsating DC voltage.

[0145] In one embodiment, the method further includes: when it is detected that the voltage value of the input first pulsating DC voltage is higher than a fourth voltage threshold, controlling the switch unit to switch to a half-bridge operating mode; when it is detected that the effective voltage value of the input first pulsating DC voltage is lower than a fifth voltage threshold, controlling the switch unit to switch to a full-bridge operating mode.

[0146] In one embodiment, the secondary conversion circuit includes a DC / DC conversion circuit, and optionally, the DC / DC conversion circuit includes a Buck-Boost circuit. The above method further includes: when it is detected that the voltage value of the second pulsating DC voltage is greater than the output voltage of the Buck-Boost circuit, controlling the Buck-Boost circuit to switch to the Buck circuit mode, and when it is detected that the voltage value of the second pulsating DC voltage is less than the output voltage of the Buck-Boost circuit, controlling the Buck-Boost circuit to switch to the Boost circuit mode.

[0147] It should be noted that the description of the charging method provided in each embodiment of the present application can refer to the description of the power supply device in the above embodiments, which will not be repeated here.

[0148] In the embodiment of the present application, a two-stage circuit architecture is used to transform the rectified pulsating DC voltage to obtain a stable DC voltage, which can ensure that the DC voltage output by the power supply device is more stable. Moreover, after the valley voltage of the first pulsating DC voltage is increased, the valley voltage of the second pulsating DC voltage input to the secondary conversion circuit is also increased, which can reduce the peak current of the secondary conversion circuit, thereby reducing the size of the magnetic components of the secondary conversion circuit, thereby reducing the volume of the power supply device.

[0149] An embodiment of the present application discloses a power supply device, including a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor implements the method described in the above embodiments.

[0150] An embodiment of the present application discloses a computer-readable storage medium storing a computer program, wherein the computer program implements the methods described in the above embodiments when executed by a processor.

[0151] An embodiment of the present application discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program can be executed by a processor to implement the methods described in the above embodiments.

[0152] like Fig.10As shown, a charging system is provided, which may include a power supply providing device 200 and a terminal device 1000 as described in the above embodiments. The power supply providing device 200 can charge the terminal device 1000, and the charging method may be wired charging or wireless charging. In addition to the components described in the above embodiments, the power supply providing device 200 may also include an output interface 270, and the terminal device 1000 may include a battery charging circuit 1010 and a battery 1020.

[0153] The power supply device 200 can establish a charging channel with the terminal device 1000, and a charging loop can be formed between the two. The output interface 270 can be connected to the output end of the secondary conversion circuit 234 of the power supply device 200. After the charging channel is established between the power supply device 200 and the terminal device 1000, the output interface 270 can be used to output a stable DC voltage to the terminal device 1000.

[0154] The battery charging circuit 1010 is used to receive the DC voltage output by the output interface 290 and charge the battery 1020 in the terminal device 1000 based on the output DC voltage.

[0155] In some embodiments, the power supply device 200 can charge the terminal device 1000 in a direct charging manner. The DC voltage output by the power supply device 200 can be a DC voltage that meets the charging requirements of the terminal device 1000, and the DC voltage output by the power supply device 200 can be directly loaded to the battery. The battery charging circuit 1010 of the terminal device 1000 can be used to receive the stable DC voltage output by the output interface 270 and load the stable DC voltage to the battery 1020. Optionally, the battery charging circuit 1010 may include components such as switches to form a direct charging path.

[0156] Optionally, in order to implement the direct charging mode, a communication connection may be established between the power supply device 200 and the terminal device 1000. The terminal device 1000 maintains communication with the power supply device 200 during the direct charging process to form a closed-loop feedback mechanism, so that the power supply device 200 can know the state of the battery 1020 in real time, thereby continuously adjusting the output DC voltage to ensure that the charging voltage and / or charging current provided by the power supply device 200 matches the voltage and / or current currently required by the battery 1020.

[0157] In some embodiments, if the DC voltage output by the power supply device 200 does not meet the voltage required by the battery 1020 of the terminal device 1000, the battery charging circuit 1010 of the terminal device 1000 may transform the received DC voltage to obtain a voltage that meets the current requirements of the battery 1020, and then load the obtained voltage to the battery 1020 to charge the battery 1020. Optionally, the battery charging circuit 1010 may include components such as a charge pump, a switch device, and a capacitor, but is not limited thereto.

[0158] A person skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a read-only memory (ROM), etc.

[0159] As used herein, any reference to memory, storage, database, or other medium may include nonvolatile and / or volatile memory. Suitable nonvolatile memory may include ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), or Flash memory. Volatile memory may include random access memory (RAM), which is used as an external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), memory bus direct RAM (RDRAM), and direct memory bus dynamic RAM (DRDRAM).

[0160] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0161] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A power supply device, characterized in that: include: A rectifier module, used for rectifying the AC voltage to obtain a first pulsating DC voltage; A conversion module, used for converting the first pulsating DC voltage to obtain a stable DC voltage; a valley filling circuit, connected to the rectifier module and the conversion module respectively, for boosting the first pulsating DC voltage output by the rectifier module when the voltage value of the first pulsating DC voltage is greater than a first voltage threshold, and storing energy based on the boosted first pulsating DC voltage, and for providing electric energy to the conversion module when the voltage value of the first pulsating DC voltage is less than a second voltage threshold, so as to increase the valley voltage of the first pulsating DC voltage input to the conversion module, wherein the first voltage threshold is greater than the second voltage threshold; The valley filling circuit includes a first voltage transformation unit and a first capacitor, wherein: The first voltage transformation unit is used to perform voltage boost transformation on the first pulsating DC voltage output by the rectifier module to charge the first capacitor when the voltage value of the first pulsating DC voltage is greater than the first voltage threshold; The first transformer unit is also used to boost the first pulsating DC voltage output by the rectifier module to charge the first capacitor, and then stop working when the voltage value of the first pulsating DC voltage drops to a third voltage threshold, so that the first capacitor stores electrical energy and maintains voltage, wherein the third voltage threshold is greater than the second voltage threshold and less than or equal to the first voltage threshold.

2. The device according to claim 1, characterized in that The first voltage transformation unit is further used to step down the voltage of the first capacitor when the voltage value of the first pulsating DC voltage is less than the second voltage threshold, so as to provide electric energy to the input end of the conversion module.

3. The device according to claim 2, characterized in that The first voltage transformation unit is further configured to perform voltage step-up transformation on the first pulsating DC voltage output by the rectifier module when the voltage value of the first pulsating DC voltage rises to the first voltage threshold, so as to charge the first capacitor; And for performing a voltage-down conversion on the voltage of the first capacitor when the voltage value of the first pulsating DC voltage drops to the second voltage threshold, so as to provide electric energy to the input end of the conversion module.

4. The device according to claim 2 or 3, characterized in that The first transformer unit comprises: a switch subunit, configured to be in a first on state when the voltage value of the first pulsating DC voltage is greater than the first voltage threshold, so that the first voltage transformation unit performs a step-up transformation on the first pulsating DC voltage output by the rectifier module to charge the first capacitor; The switch subunit is also used to be in a second conduction state when the voltage value of the first pulsating DC voltage is less than the second voltage threshold, so that the first transformer unit can step down the voltage of the first capacitor and provide electrical energy to the input end of the conversion module.

5. The device according to claim 4, characterized in that The switch subunit includes a first switch and a second switch, the first transformer unit also includes a first inductor, a first diode and a second diode, the first switch is connected in parallel with the first diode, the second switch is connected in parallel with the second diode, the cathode of the first diode is connected to one end of the first capacitor, the anode of the first diode is connected to the first inductor, the anode of the second diode is connected to the other end of the first capacitor, and the cathode of the second diode is connected to the first inductor.

6. The device according to claim 5, characterized in that The first conduction state includes the first switch being in an off state, and the second switch switching between an off state and an on state according to a first frequency; when the switch subunit is in the first conduction state, the first inductor, the first diode and the second switch form a boost circuit; The second conduction state includes the first switch switching between the disconnection state and the conduction state according to the second frequency, and the second switch is in the disconnection state; when the switch subunit is in the second conduction state, the first inductor, the second diode and the first switch form a buck step-down circuit.

7. The device according to claim 5, characterized in that The first transformer unit is also used to stop working when the voltage value of the first pulsating DC voltage is greater than or equal to the output voltage of the first transformer unit and less than the first voltage threshold after stepping down the voltage of the first capacitor to provide electrical energy to the input end of the conversion module. The first switch and the second switch are both in the disconnected state, and the first pulsating DC voltage output by the rectifier module charges the first capacitor through the first diode.

8. The device according to claim 5, characterized in that The first transformer unit is further used to step up the first pulsating DC voltage output by the rectifier module to charge the first capacitor. When the voltage value of the first pulsating DC voltage drops to a third voltage threshold, the first transformer unit stops working, the first switch and the second switch are both in a disconnected state, and the first capacitor stores electrical energy and maintains voltage, wherein the third voltage threshold is greater than the second voltage threshold and less than or equal to the first voltage threshold.

9. The device according to any one of claims 5 to 8, characterized in that: The first transformer unit is further used to provide electric energy to the input end of the conversion module through the output voltage when the voltage value of the first pulsating DC voltage is less than the output voltage of the first transformer unit after the switch subunit is switched to the second conduction state.

10. The device according to any one of claims 5 to 8, characterized in that: The device also includes: a detection module, connected to the output end of the rectifier module, and used to detect the voltage value of the first pulsating DC voltage output by the output end of the rectifier module; A control module is connected to the detection module and the first transformer unit, respectively, and is used to control the switch subunit to switch to the first conduction state when the voltage value of the first pulsating DC voltage detected by the detection module rises to the first voltage threshold, and to control the switch subunit to switch to the second conduction state when the voltage value of the first pulsating DC voltage detected by the detection module drops to the second voltage threshold.

11. The device according to any one of claims 1 to 3 or 5 to 8, characterized in that: The first capacitor includes any one of the following: a ceramic capacitor, a film capacitor, and an electrolytic capacitor with a capacity smaller than a capacity threshold.

12. The device according to claim 1, characterized in that The transformation module comprises: a primary conversion circuit, used for performing isolation conversion on the first pulsating DC voltage to obtain a second pulsating DC voltage; The two-stage conversion circuit is used to convert the second pulsating DC voltage to obtain a stable DC voltage.

13. The device according to claim 12, characterized in that The primary conversion circuit comprises: A switch unit, used for performing chopping modulation on the input first pulsating DC voltage to obtain a modulated voltage; The second voltage transformation unit is used to transform and rectify the modulated voltage to obtain a second pulsating DC voltage.

14. The device according to claim 13, characterized in that The switching unit is also used to switch to the half-bridge operating mode when the voltage value of the input first pulsating DC voltage is higher than a fourth voltage threshold, and to switch to the full-bridge operating mode when the effective voltage value of the input first pulsating DC voltage is lower than a fifth voltage threshold, and the fourth voltage threshold is greater than the fifth voltage threshold.

15. The device according to any one of claims 12 to 14, characterized in that: The primary conversion circuit includes a DC voltage conversion circuit, and the secondary conversion circuit includes a DC / DC conversion circuit.

16. A charging method, characterized in that: Applied to a power supply device, the method comprises: Rectifying the received AC voltage through a rectifying module to obtain a first pulsating DC voltage; The first pulsating DC voltage is transformed by a transformation module to obtain a stable DC voltage; When the voltage value of the first pulsating DC voltage is greater than a first voltage threshold, the first pulsating DC voltage output by the rectifier module is boosted by a valley filling circuit, and the valley filling circuit is charged based on the boosted first pulsating DC voltage; When the voltage value of the first pulsating DC voltage is less than a second voltage threshold, the valley filling circuit provides electric energy to the conversion module to increase the valley voltage of the first pulsating DC voltage input to the conversion module, wherein the first voltage threshold is greater than the second voltage threshold; the valley filling circuit includes a first voltage conversion unit and a first capacitor; When the voltage value of the first pulsating DC voltage is greater than a first voltage threshold, the first pulsating DC voltage output by the rectifier module is boosted by a valley filling circuit, and the valley filling circuit is charged based on the boosted first pulsating DC voltage, comprising: When the voltage value of the first pulsating DC voltage is greater than a first voltage threshold, the first voltage transformation unit performs a voltage-boosting transformation on the first pulsating DC voltage output by the rectifier module to charge the first capacitor; The method further comprises: After the first pulsating DC voltage output by the rectifier module is stepped up and transformed by the first transformer unit to charge the first capacitor, when the voltage value of the first pulsating DC voltage drops to a third voltage threshold, the first capacitor stops working and stores electrical energy and maintains voltage, wherein the third voltage threshold is greater than the second voltage threshold and less than or equal to the first voltage threshold.

17. The method according to claim 16, characterized in that When the voltage value of the first pulsating DC voltage is less than a second voltage threshold, providing electric energy to the conversion module through the valley filling circuit includes: When the voltage value of the first pulsating DC voltage is less than a second voltage threshold, the voltage of the first capacitor is stepped down by the first voltage transformation unit to provide electric energy to the input end of the transformation module.

18. The method according to claim 17, characterized in that The first voltage transformation unit includes a switch subunit, and the method further includes: When the voltage value of the first pulsating DC voltage rises to the first voltage threshold, switching the switch subunit to a first conducting state; When the voltage value of the first pulsating DC voltage drops to the second voltage threshold, the switch subunit is switched to a second conducting state.

19. The method according to claim 18, characterized in that The switch subunit includes a first switch and a second switch, the first voltage transformation unit also includes a first inductor, a first diode and a second diode, the first switch is connected in parallel with the first diode, the second switch is connected in parallel with the second diode, the cathode of the first diode is connected to one end of the first capacitor, the anode of the first diode is connected to the first inductor, the anode of the second diode is connected to the other end of the first capacitor, and the cathode of the second diode is connected to the first inductor; The first conduction state includes the first switch being in an off state, and the second switch switching between an off state and an on state according to a first frequency; when the switch subunit is in the first conduction state, the first inductor, the first diode and the second switch form a boost circuit; The second conduction state includes the first switch switching between the disconnection state and the conduction state according to the second frequency, and the second switch is in the disconnection state; when the switch subunit is in the second conduction state, the first inductor, the second diode and the first switch form a buck step-down circuit.

20. The method according to claim 19, characterized in that After switching the switch subunit to the second conducting state, the method further includes: When the voltage value of the first pulsating DC voltage is greater than or equal to the output voltage of the first transformer unit and less than the first voltage threshold, the first switch and the second switch are controlled to be in a disconnected state, the first transformer unit stops working, and the first pulsating DC voltage output by the rectifier module is input to the first capacitor through the first diode to charge the first capacitor.

21. The method according to claim 19, characterized in that After switching the switch subunit to the first conducting state, the method further includes: When the voltage value of the first pulsating DC voltage drops to a third voltage threshold, the first switch and the second switch are controlled to be in a disconnected state, the first transformer unit stops working, and the first capacitor stores electrical energy and maintains the voltage, wherein the third voltage threshold is greater than the second voltage threshold and less than or equal to the first voltage threshold.

22. A charging system, characterized in that: The invention comprises a power supply device and a terminal as claimed in any one of claims 1 to 15, wherein: The power supply device further comprises an output interface, wherein the output interface is connected to an output end of a secondary conversion circuit of the power supply device; The terminal includes a battery charging circuit; The battery charging circuit is used to receive the DC voltage output by the output interface and charge the battery in the terminal based on the output DC voltage.

23. A power supply device, characterized in that: The method comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor implements the method according to any one of claims 16 to 21.

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