CN114337213A - Power supply device and charging control method - Google Patents

Abstract

The present disclosure provides a power supply device and a charging control method. The power supply device includes: a charging interface; a transformer, comprising: a primary winding and a secondary winding; the rectifying circuit is connected with the primary winding of the transformer and used for converting the received alternating current into a first direct current; the voltage value of the first direct current is a first direct current voltage; the transformer is used for converting the first direct-current voltage into a second direct-current voltage; the first energy storage capacitor is connected between the secondary winding of the transformer and the charging interface and used for storing and outputting a second direct current voltage; the control unit is used for detecting whether the input end of the rectifying circuit is powered down or not; and the discharge circuit is connected with the first energy storage capacitor and used for discharging the first energy storage capacitor when the control unit detects that the input end of the rectifying circuit is powered down.

Description

Power supply device and charging control method

Technical Field

The present disclosure relates to the field of charging technologies, and in particular, to a power supply device and a charging control method.

Background

An AC-DC power supply device (e.g., a power adapter) can convert AC power into DC power for charging a mobile phone, a notebook computer, or the like. The AC-DC power supply device generally includes a transformer, and capacitors for voltage stabilization and energy storage are respectively disposed on a primary side and a secondary side of the transformer. When the power supply device is disconnected from the ac power supply, energy still stored in the primary side capacitor and the secondary side capacitor may cause electric shock to the power supply device or cause an abnormality in logic control therein.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure is directed to a power supply device and a charging control method, which can realize a power supply device having a small size.

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

According to an aspect of the present disclosure, there is provided a power supply apparatus including: a charging interface; a transformer, comprising: a primary winding and a secondary winding; the rectifying circuit is connected with the primary winding of the transformer and used for converting the received alternating current into a first direct current; the voltage value of the first direct current is a first direct current voltage; the transformer is used for converting the first direct-current voltage into a second direct-current voltage; the first energy storage capacitor is connected between the secondary winding of the transformer and the charging interface and used for storing and outputting a second direct current voltage; the control unit is used for detecting whether the input end of the rectifying circuit is powered down or not; and the discharge circuit is connected with the first energy storage capacitor and used for discharging the first energy storage capacitor when the control unit detects that the input end of the rectifying circuit is powered down.

According to an embodiment of the present disclosure, the power supply device further includes: the first switch unit is connected between the first end of the first energy storage capacitor and the first end of the charging interface, and the control end of the first switch unit is connected with the control unit; the control unit is also used for controlling the first switch unit to be switched off when detecting that the power supply device is abnormal.

According to an embodiment of the present disclosure, the power supply device further includes: and the second energy storage capacitor is connected between the rectifying circuit and the primary winding of the transformer and used for storing and outputting the first direct current voltage.

According to one embodiment of the present disclosure, a first end of the first energy storage capacitor is connected between a first end of the secondary winding and a first end of the charging interface, and a second end of the first energy storage capacitor is connected between a second end of the secondary winding and a second end of the charging interface and grounded; the discharge circuit includes: a resistor and a second switch unit; the first end of the resistor is connected with the first end of the first energy storage capacitor, and the second end of the resistor is grounded through the second switch unit; the control end of the second switch unit is connected with the control unit; the control unit is also used for sending a discharge control signal to the discharge circuit when detecting that the input end of the rectifying circuit is powered down; when the second switch unit receives the discharge control signal, the second switch unit is conducted to discharge the first energy storage capacitor through the resistor.

According to an embodiment of the present disclosure, the control unit is connected to the primary winding of the transformer, and is further configured to output a PWM signal to the primary winding of the transformer to control the transformer to convert the first dc voltage into the second dc voltage.

According to one embodiment of the present disclosure, a first end of the first energy storage capacitor is connected between a first end of the secondary winding and a first end of the charging interface, and a second end of the first energy storage capacitor is connected between a second end of the secondary winding and a second end of the charging interface and grounded; the discharge circuit includes: a resistance; the control unit includes: the system comprises a first control module and a second control module; the second control module is respectively connected with the first control module and the charging interface; the first end of the resistor is connected with the first end of the first energy storage capacitor, and the second end of the resistor is grounded through the second control module; the first control module is respectively connected with the primary winding of the transformer and the second control module and used for outputting a PWM signal to the primary winding of the transformer so as to control the transformer to convert the first direct-current voltage into the second direct-current voltage; detecting whether the input end of the rectifying circuit is powered down or not, and sending a discharge control signal to the second control module when the input end of the rectifying circuit is powered down; the second control module is further used for discharging the first energy storage capacitor through the resistor when receiving the discharging control signal.

According to an embodiment of the present disclosure, the second control module is further configured to receive feedback information of a device to be charged connected through the charging interface, and control the first control module to adjust the pulse width or the frequency of the PWM signal according to the feedback information.

According to an embodiment of the present disclosure, the feedback information includes: the charging method includes the steps that a charging voltage value and/or a charging current value expected by a device to be charged are/is obtained, or an adjusting instruction generated by the device to be charged based on the expected charging voltage value and/or the charging current value is obtained.

According to one embodiment of the present disclosure, a first end of the first energy storage capacitor is connected between a first end of the secondary winding and a first end of the charging interface, and a second end of the first energy storage capacitor is connected between a second end of the secondary winding and a second end of the charging interface and grounded; the discharge circuit includes: a resistance; the control unit includes: the system comprises a first control module and a second control module; the second control module is respectively connected with the first control module and the charging interface; the first end of the resistor is connected with the first end of the first energy storage capacitor, and the second end of the resistor is grounded through the second control module; the second control module is used for detecting whether the input end of the rectifying circuit is powered down or not and discharging the first energy storage capacitor through the resistor when the input end of the rectifying circuit is detected to be powered down; the first control module is respectively connected with the primary winding of the transformer and the second control module and used for outputting PWM signals to the primary winding of the transformer so as to control the transformer to convert the first direct-current voltage into the second direct-current voltage.

According to an embodiment of the present disclosure, the second control module is further configured to receive feedback information of a device to be charged connected through the charging interface, and control the first control module to adjust the pulse width or the frequency of the PWM signal according to the feedback information.

According to an embodiment of the present disclosure, the feedback information includes: the charging method includes the steps that a charging voltage value and/or a charging current value expected by a device to be charged are/is obtained, or an adjusting instruction generated by the device to be charged based on the expected charging voltage value and/or the charging current value is obtained.

According to another aspect of the present disclosure, there is provided a charging control method applied to a power supply apparatus, the method including: converting the received alternating-current voltage into a first direct-current voltage on a primary side of a transformer of the power supply device, wherein the voltage value of the first direct-current voltage is the first direct-current voltage; converting the first direct-current voltage into a second direct-current voltage through a transformer; on the secondary side of the transformer, a first energy storage capacitor of a power supply device is used for storing and outputting a second direct current voltage; when the input end of the rectifying circuit of the power supply device is detected to be powered off, the first energy storage capacitor is discharged through the discharging circuit of the power supply device.

According to an embodiment of the present disclosure, the method further comprises: when the power supply device is detected to be abnormal, the first switch unit connected between the first energy storage capacitor and the charging interface of the power supply device is controlled to be turned off.

According to an embodiment of the present disclosure, the method further comprises: on the primary side of the transformer, a first direct current voltage is stored and output to a primary winding of the transformer through a second energy storage capacitor of the power supply device.

According to an embodiment of the present disclosure, when detecting that the input terminal of the rectifying circuit of the power supply device is powered down, the discharging circuit of the power supply device discharges the first energy storage capacitor, including: when detecting that the input end of a rectifying circuit of the power supply device is powered off, sending a discharging control signal to a control end of a second switch unit in a discharging circuit; when the second switch unit receives the discharge control signal, the second switch unit is conducted to discharge the first energy storage capacitor through the resistor in the discharge circuit.

According to an embodiment of the present disclosure, the method further comprises: and outputting a PWM signal to a primary winding of the transformer to control the transformer to convert the first direct-current voltage into a second direct-current voltage.

According to an embodiment of the present disclosure, when detecting that the input terminal of the rectifying circuit of the power supply device is powered down, the discharging circuit of the power supply device discharges the first energy storage capacitor, including: detecting whether the input end of a rectifying circuit is powered down or not through a first control module of a power supply device, and sending a discharging control signal to a second control module of the power supply device when the input end of the rectifying circuit is detected to be powered down; when the second control module receives the discharging control signal, the first energy storage capacitor is discharged through the resistor in the discharging circuit.

According to an embodiment of the present disclosure, the method further comprises: outputting a PWM signal to a primary winding of a transformer through a first control module to control the transformer to convert a first direct-current voltage into a second direct-current voltage; receiving feedback information of the equipment to be charged connected through the charging interface through a second control module; and controlling the first control module to adjust the pulse width or frequency of the PWM signal according to the feedback information.

According to an embodiment of the present disclosure, the feedback information includes: the charging method includes the steps that a charging voltage value and/or a charging current value expected by a device to be charged are/is obtained, or an adjusting instruction generated by the device to be charged based on the expected charging voltage value and/or the charging current value is obtained.

According to an embodiment of the present disclosure, when detecting that the input terminal of the rectifying circuit of the power supply device is powered down, the discharging circuit of the power supply device discharges the first energy storage capacitor, including: detecting whether the input end of the rectifying circuit is powered down or not through a second control module of the power supply device; when the input end of the rectifying circuit is detected to be powered off, the first energy storage capacitor is discharged through the resistor in the discharging circuit.

According to an embodiment of the present disclosure, the method further comprises: outputting a PWM signal to a primary winding of a transformer through a first control module of a power supply device to control the transformer to convert a first direct-current voltage into a second direct-current voltage; receiving feedback information of the equipment to be charged connected through the charging interface through a second control module; and according to the feedback information, controlling a first control module of the power supply device to adjust the pulse width or frequency of the PWM signal.

According to an embodiment of the present disclosure, the feedback information includes: the charging method includes the steps that a charging voltage value and/or a charging current value expected by a device to be charged are/is obtained, or an adjusting instruction generated by the device to be charged based on the expected charging voltage value and/or the charging current value is obtained.

According to the power supply device provided by the embodiment of the disclosure, the discharge circuit is arranged on the secondary side of the transformer, and when the fact that the power supply device is disconnected from the alternating current power supply is recognized, the discharge circuit is controlled to discharge, so that residual electric energy in the energy storage capacitor is released, the voltage is reduced to zero, the electric shock damage of the power supply device can be avoided, and the abnormal logic control of the power supply device can be avoided.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 is a circuit schematic diagram showing an AC-DC power supply device in the related art according to an example.

Fig. 2 is a circuit schematic diagram showing another AC-DC power supply device in the related art according to an example.

Fig. 3 is a schematic diagram illustrating a charging system in accordance with an exemplary embodiment.

Fig. 4 is a schematic structural diagram illustrating a power supply apparatus according to an exemplary embodiment.

Fig. 5 is a schematic structural diagram illustrating another power supply apparatus according to an exemplary embodiment.

Fig. 6 is a schematic diagram illustrating yet another power supply apparatus according to an exemplary embodiment.

Fig. 7 is a schematic diagram illustrating yet another power supply apparatus according to an exemplary embodiment.

Fig. 8 is a schematic diagram illustrating yet another power supply apparatus according to an exemplary embodiment.

Fig. 9 is a schematic diagram illustrating yet another power supply apparatus according to an exemplary embodiment.

Fig. 10 is a schematic diagram illustrating still another power supply apparatus according to an exemplary embodiment.

Fig. 11 is a schematic diagram illustrating still another power supply apparatus according to an exemplary embodiment.

Fig. 12 is a flow chart illustrating a charge control method according to an exemplary embodiment.

Fig. 13 is a flow chart illustrating another charge control method according to an exemplary embodiment.

Fig. 14 is a flowchart illustrating yet another charge control method according to an exemplary embodiment.

Fig. 15 is a flowchart illustrating yet another charge control method according to an exemplary embodiment.

Fig. 16 is a flowchart illustrating yet another charge control method according to an exemplary embodiment.

Fig. 17 is a flowchart illustrating yet another charge control method according to an exemplary embodiment.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.

Furthermore, in the description of the present disclosure, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Fig. 1 is a circuit schematic diagram showing an AC-DC power supply device in the related art according to an example. As shown in fig. 1, in the AC-DC power supply apparatus 10, AC power is input through an AC terminal, and the input AC waveform is a 220V sine wave, taking commercial power with 220V/50Hz AC power as an example. The input alternating current is rectified through a full bridge rectifier U1 composed of 4 diodes, and the output steamed bread waves. The primary winding of the transformer T1 is connected to the switch pin SW of the switching power supply chip U2. The switch pin SW outputs a PWM (Pulse Width Modulation) square wave with a high frequency, which is used for modulating the steamed bread wave output by the rectifier U1. And feedback is obtained from a single winding and input to the feedback pin FB of the switching power supply chip U2, so that the output voltage of the secondary side is stabilized.

On the primary side of the transformer T1, capacitors C1 and C2 are included for storing energy to stabilize the voltage rectified by the rectifier U1. Since the voltage on the primary side of the transformer T1 is very high, a liquid electrolytic capacitor with high voltage resistance is usually selected as the energy storage capacitor. The liquid electrolytic capacitor has large capacitance and volume. On the secondary side of the transformer T1, a capacitor C5 is included for storing the electric energy output from the secondary side, so as to achieve the function of energy storage and filtering, thereby outputting a stable dc voltage.

When an electrical appliance (such as a device to be charged) needs an AC-DC Power Supply device to provide output voltages with different voltage values, for example, a terminal supporting a PD (Power Delivery) protocol, a PPS (Programmable Power Supply) protocol, or a QC (Quick Charge) protocol needs direct currents with different voltage values provided by a Power adapter, the AC-DC Power Supply device needs to communicate with the electrical appliance, so that the electrical appliance can send the required charging voltage to the AC-DC Power Supply device.

Fig. 2 is a circuit schematic diagram showing another AC-DC power supply device in the related art according to an example. As shown in fig. 2, unlike the AC-DC power supply apparatus 10 shown in fig. 1, the AC-DC power supply apparatus shown in fig. 2 further includes a low-voltage protocol control chip U3 on the secondary side of the transformer T1 for handshake communication with connected consumer devices to receive their required charging voltage values transmitted from the consumers. In addition, the chip U3 may also be used for sampling voltage/current on the secondary side, and transmitting a control feedback signal to the switching power supply chip U2 on the primary side through an isolation device such as an optical coupler. After the switching power supply chip U2 receives the control feedback signal, the pulse width or frequency of the PWM signal is adjusted, so that the transformer T1 transmits appropriate energy to its secondary side, and then the rectifier diode D3 (or an MOS transistor for rectification) outputs electric energy, and the capacitor C5 stores the electric energy, thereby outputting a stable dc voltage.

Thus, it can be seen that either the power supply apparatus 10 shown in fig. 1 or the power supply apparatus 20 shown in fig. 2 includes capacitors for tank filtering on both the primary and secondary sides thereof. When the power supply device is disconnected from the ac power source, the primary side capacitor and the secondary side capacitor still store energy, which may cause electric shock and damage to the power supply device.

In addition, with the increasing popularization of protocols such as PD, PPS, etc., the power adapter will be compatible with different functions to support various protocols, and the control logic/flow thereof will be more and more complex. At present, when the power adapter has an abnormal condition (such as unable to output voltage and current normally, unstable output, etc.), a user usually unplugs the power adapter and waits for the power adapter to be completely powered off, so as to turn off the power adapter and reset the power adapter. However, as the function of the adapter is complex, under the condition that the protection mechanisms are more and more, when the power supply device is disconnected from the alternating current power supply, due to the fact that energy is still stored in the primary side capacitor and the secondary side capacitor, the logic control in the power adapter may be abnormal.

Hereinafter, a power supply device and a charging control method in an exemplary embodiment of the present disclosure will be described in more detail with reference to the drawings and the embodiment.

Fig. 3 is a schematic diagram illustrating a charging system in accordance with an exemplary embodiment.

Referring to fig. 2, the charging system 30 includes: a power supply device 31 and a device to be charged 32.

The Power supply device 31 is, for example, a Power adapter, a portable Power supply (Power Bank), or the like.

The device to be charged 32 may be, for example, a terminal or an electronic device, which may be a mobile phone, a game console, a tablet Computer, an electronic book reader, a smart wearable device, a mobile terminal such as MP4(moving picture Experts Group Audio Layer IV, motion picture Experts compression standard Audio Layer 4) player, a smart home device, an AR (Augmented Reality) device, a VR (Virtual Reality) device, or a mobile terminal with a charging function such as a mobile power supply (e.g., a charger, a travel charger), an electronic cigarette, a wireless mouse, a wireless keyboard, a wireless headset, a bluetooth speaker, or a Personal Computer (Personal Computer, PC), such as a laptop Computer and a desktop Computer.

The device to be charged 32 is connected to the charging interface 311 of the power supply apparatus 31 through the charging interface 321 to charge the battery 322.

The charging interface 321 may be, for example, a USB 2.0 interface, a USB 3.0 interface, a Micro USB interface, or a female connector of a USB TYPE-C interface. In some embodiments, the charging interface 321 may also be a master of a Lightning interface, or any other type of parallel or serial interface capable of being used for charging.

Correspondingly, the charging interface 311 may be a public USB 2.0 interface, a USB 3.0 interface, a Micro USB interface, a USB Type C interface, or a Lightning interface adapted to the charging interface 321.

For example, the power supply device 31 can communicate with the device to be charged 32 through the charging interface 311 and the charging interface 321, and both sides do not need to provide an additional communication interface or other wireless communication modules. If the charging interface 311 and the charging interface 321 are USB interfaces, the power supply device 31 and the device to be charged 32 can communicate based on data lines (e.g., D + and/or D-lines) in the USB interfaces. If the charging interface 311 and the charging interface 321 are USB interfaces (such as USB TYPE-C interfaces) supporting a power transfer (PD) communication protocol, the power supply device 31 and the device to be charged 32 can communicate based on the PD communication protocol. Further, the power supply device 31 and the device to be charged 12 may also communicate by other communication means than the charging interface 311 and the charging interface 321. For example, the power supply device 31 and the device to be charged 32 communicate by wireless means, such as Near Field Communication (NFC).

Fig. 4 is a schematic structural diagram illustrating a power supply apparatus according to an exemplary embodiment.

Referring to fig. 4, the power supply device 40 includes: rectifier circuit 401, transformer 402, energy storage capacitor 403, control unit 404, discharge circuit 405 and charging interface 406.

The rectifying circuit 401 is located on the primary side of the transformer 402, and is used for converting the alternating current received from the AC port into a first direct current. The voltage of the first direct current is a first direct current voltage, and the first direct current voltage may be, for example, a pulsating direct current voltage.

Fig. 5 is a schematic structural diagram illustrating another power supply apparatus according to an exemplary embodiment. Referring to fig. 5, the rectifying circuit 401 may be, for example, a full-bridge rectifier, but the disclosure is not limited thereto, and the rectifying circuit 401 may also be a half-bridge rectifier or another type of rectifying circuit.

Referring to fig. 4 and 5 jointly, the transformer 402 includes a primary winding L1 and a secondary winding L2, and the rectifying circuit 401 is connected to the primary winding L1 of the transformer 402.

The transformer 402 is used to convert the first dc voltage into a second dc voltage, which is also a pulsating dc voltage.

The energy storage capacitor 403 is connected between the secondary winding L2 of the transformer 402 and the charging interface 406, and is used for storing energy to output a stable second dc voltage through the charging interface 406.

The control unit 404 is configured to detect whether the input terminal of the rectifying circuit 401 is powered down, that is, whether the AC terminal of the rectifying circuit 401 has no input voltage.

In fig. 4 and 5, the control unit 404 is connected to the transformer 402 as an example, and detects whether the input end of the rectifying circuit 401 is powered down by detecting the input voltage on the primary side of the transformer 402 or detecting the output voltage on the secondary side of the transformer 402, but the disclosure is not limited thereto. The control unit 404 may also be directly connected to the rectifier circuit 401 to detect whether the input terminal of the rectifier circuit 401 is powered down.

The discharging circuit 405 is connected to the energy storage capacitor 403, and is configured to discharge the energy storage capacitor 403 when the control unit detects that the input terminal of the rectifier circuit is powered down.

According to the power supply device provided by the embodiment of the disclosure, the discharge circuit is arranged on the secondary side of the transformer, and when the fact that the power supply device is disconnected from the alternating current power supply is recognized, the discharge circuit is controlled to discharge, so that residual electric energy in the energy storage capacitor is released, the voltage is reduced to zero, the electric shock damage of the power supply device can be avoided, and the abnormal logic control of the power supply device can be avoided.

Fig. 6 is a schematic diagram illustrating yet another power supply apparatus according to an exemplary embodiment. Unlike the power supply device 40 shown in fig. 4 and 5, the power supply device 60 shown in fig. 6 further includes: the voltage conversion module 607.

The voltage conversion module 607 is located on the secondary side of the transformer 402 and is connected to the secondary winding of the transformer 402 via the energy storage capacitor 403. The voltage conversion module 607 is configured to convert the stable second dc voltage output by the energy storage capacitor 403 and output a third dc voltage.

The voltage conversion module 607 may be, for example, a BUCK step-down circuit or a charge pump (charge pump) circuit, and further steps down and converts the stable second dc voltage output by the energy storage capacitor 403 to output a third dc voltage.

Or, the voltage conversion module 607 may also be a BOOST circuit or a BUCK-BOOST circuit, and when a higher voltage needs to be output, the voltage conversion module further BOOSTs and converts the stable second dc voltage output by the energy storage capacitor 403, and outputs a third dc voltage.

The third dc voltage may be a constant dc voltage, but the disclosure is not limited thereto. The third dc voltage may also be a pulsating dc voltage, for example, depending on the requirements of the application scenario.

It should be noted that the present disclosure does not limit the conversion ratio of the charge pump, and in practical applications, the conversion ratio is set according to practical requirements, and may be set to 1:1, 2:1, 3:1, and so on, for example. Further, when it is necessary to output a higher voltage, the conversion ratio of the charge pump may also be set to 1:2, 1:3, or the like for the boosting operation.

Still alternatively, the voltage conversion module 607 may further include: and a CUK circuit. The CUK circuit can realize both the step-up operation and the step-down operation.

The control unit 404 is connected to the voltage conversion module 607, and besides detecting whether the input terminal of the rectifying circuit 401 is powered down, the control unit may also be configured to control the voltage conversion module 607 to adjust the output voltage and/or the output current of the power supply apparatus 60. For example, the control unit 404 may adjust the output voltage and/or the output current of the power supply apparatus 60 by controlling the voltage conversion module 607 to adjust, for example, a voltage conversion ratio.

In some embodiments, the control unit 404 may further communicate with a device to be charged (e.g., the device to be charged 32 shown in fig. 3) through the charging interface 406, receive feedback information sent by the device to be charged, and control the voltage conversion module 607 to adjust the output voltage and/or the output current of the power supply apparatus 60 according to the feedback information. The feedback information may be, for example, a desired charging voltage and/or charging current of the device to be charged, or an adjustment instruction generated by the device to be charged based on the desired charging voltage and/or charging current, such as an instruction to increase or decrease the output voltage and/or output current.

The discharge circuit 405 includes: a resistor 4051 and a switching unit 4052. The resistor 4051 has one end connected to one end of the energy storage capacitor 403, and the other end grounded via the switch unit 4052. The control terminal of the switch unit 4052 is connected to the control unit 404. When detecting that the input terminal of the rectifier circuit is powered down, the control unit 404 sends a discharge control signal to the control terminal of the switch unit 4052 to control the switch unit 4052 to be turned on, so that the energy storage capacitor 403 is discharged through the resistor 4051.

The switch unit 4052 is, for example, a controllable switch tube, such as a MOS tube, etc., which is not limited by the disclosure.

The power supply device provided by the embodiment of the disclosure can discharge the energy storage capacitor when the power supply device is disconnected from the alternating current power supply through the discharge circuit. Furthermore, the power supply device does not need to be arranged on the primary side of a transformer, and the electrolytic capacitor with large volume is used for storing energy and stabilizing voltage on the primary side, so that the size of the power supply device can be reduced on one hand, and on the other hand, the liquid electrolytic capacitor is removed, so that the service life of the power supply device can be prolonged, and the safety of the power supply device can be improved. In addition, the voltage conversion part is moved to the secondary side of the transformer, and the voltage conversion module only needs to process the voltage with lower amplitude to convert and output stable constant direct current voltage. And the control circuit for voltage conversion is arranged on the secondary side of the transformer, so that the use of devices can be further reduced, and the volume of the power supply device is reduced.

Fig. 7 is a schematic diagram illustrating yet another power supply apparatus according to an exemplary embodiment. Unlike the power supply device 60 shown in fig. 6, in the power supply device 70 shown in fig. 7, the discharge circuit 705 includes: resistor 7051. One end of the resistor 7051 is connected to one end of the energy storage capacitor 403, and the other end is connected to the control unit 404 and is grounded through the control unit 404. After detecting that the power supply device 70 is disconnected from the ac power supply, the control unit 404 discharges the energy storage capacitor 403 through the resistor 7051. For example, the resistor 7051 is connected to a switch tube inside the control unit 404 and grounded through the switch tube. After the control unit 404 detects that the power supply device 70 is disconnected from the ac power supply, it controls the switch tube inside thereof to be turned on, so as to discharge the energy storage capacitor 403 through the resistor 7051 connected in parallel with the energy storage capacitor 403.

The power supply device provided by the embodiment of the present disclosure can realize the discharge of the energy storage capacitor 403 by using the switch inside the control unit 404 and only setting the resistance element.

In addition to the power supply apparatus including only the secondary-side energy storage capacitor, the discharge circuit in the embodiment of the disclosure may also be disposed in a power supply apparatus including both the primary-side energy storage capacitor and the secondary-side energy storage capacitor.

Fig. 8 is a schematic diagram illustrating yet another power supply apparatus according to an exemplary embodiment.

Referring to fig. 8, the power supply device 80 includes: the device comprises a rectifying circuit 401, a transformer 402, an energy storage capacitor 403, a control unit 804, a discharging circuit 405, a charging interface 406 and an energy storage capacitor 808.

A rectifying circuit 401 is located on the primary side of the transformer 402 for converting the alternating current received from the AC port to a first direct current. The voltage of the first direct current is a first direct current voltage, and the first direct current voltage may be, for example, a pulsating direct current voltage. The rectifier circuit 401 may be a full bridge rectifier, a plate bridge rectifier, or another type of rectifier circuit.

The energy storage capacitor 808 is connected between the rectifying circuit 401 and the primary winding of the transformer 402, and is configured to store and stabilize the first dc voltage output by the rectifying circuit 401, so as to output a stable first dc voltage.

The transformer 402 is used to convert the first dc voltage into a second dc voltage, which is also a pulsating dc voltage.

The energy storage capacitor 403 is connected between the secondary winding of the transformer 402 and the charging interface 406, and is used for storing energy so as to output a stable second dc voltage through the charging interface 406.

The control unit 804 is connected to the primary winding of the transformer 402, and is configured to output a PWM signal to the primary winding of the transformer 402 to control the primary winding of the transformer 402, so that the transformer 402 transmits appropriate energy to the secondary side thereof.

The discharge circuit 405 includes: a resistor 4051 and a switching unit 4052. One end of the resistor 4051 is connected to one end of the energy storage capacitor 403, and the other end is grounded through the switch unit 4052. The control terminal of the switching unit 4052 is connected to the control unit 804.

When the switch unit 4052 on the secondary side is connected to communicate with the control unit 804 on the primary side, the control unit 804 on the high-voltage side needs to be isolated accordingly to prevent interference on the high-voltage side. Isolation techniques for high and low voltages are well known to those skilled in the art and will not be described in detail herein to avoid obscuring the present disclosure.

The control unit 804 is further configured to send a discharge control signal to the control terminal of the switching unit 4052 when detecting that the input terminal of the rectifier circuit 401 is powered down. When the switching unit 4052 receives the discharge control signal, the switching unit 4052 is turned on, and the energy storage capacitor 403 is discharged through the resistor 4051.

The control unit 804 can identify whether the input terminal of the rectifier circuit 401 is powered down, that is, whether the power supply apparatus 80 is disconnected from the ac power supply, for example, by detecting the input voltage on the primary side of the transformer 402.

The power supply device provided by the embodiment of the disclosure is provided with the energy storage capacitors on the primary side and the secondary side of the transformer, the discharge circuit is arranged on the secondary side, and after the discharge circuit is disconnected from the alternating current power supply, the simultaneous discharge of the energy storage capacitors on the primary side and the secondary side can be realized. Compared with the discharge circuit arranged on the primary side of high voltage, the discharge circuit is safer, components with smaller volume can be selected, and the volume of the power supply device is reduced.

Fig. 9 is a schematic diagram illustrating yet another power supply apparatus according to an exemplary embodiment. Unlike the power supply device 80 shown in fig. 8, the control unit 904 in the power supply device 90 shown in fig. 9 includes: a first control module 9041 and a second control module 9042.

The first control module 9041 is connected to the secondary winding of the transformer 402, and configured to output a PWM signal to the primary winding of the transformer 402 to control the primary winding of the transformer 402, so that the transformer 402 transmits appropriate energy to the secondary side thereof.

The second control module 9042 is connected to the charging interface 406 and the first control module 9041, and is configured to receive feedback information sent by the connected device to be charged, and send the feedback information to the first control module 9041. The first control module 9041 adjusts the pulse width or frequency of the PWM signal according to the feedback information, so that the transformer 402 transmits the appropriate energy to the secondary side thereof. The feedback information may include, for example: the charging method includes the steps that a charging voltage value and/or a charging current value expected by a device to be charged are/is obtained, or an adjusting instruction generated by the device to be charged based on the expected charging voltage value and/or the charging current value is obtained.

In addition, in some embodiments, the second control module 9042 may also generate an adjustment instruction for the first control module 9041 according to the feedback information, and directly instruct the first control module 9041 to adjust the pulse width or the frequency of the PWM signal.

Likewise, isolation elements also need to be provided between the first and second control modules 9041, 9042 for the primary and secondary sides of the transformer 402, respectively.

The discharge circuit 405 includes: a resistor 4051 and a switching unit 4052. One end of the resistor 4051 is connected to one end of the energy storage capacitor 403, and the other end is grounded through the switch unit 4052. The control terminal of the switching unit 4052 is connected to the second control module 9042.

In some embodiments, it may be detected by the first control module 9041 whether the input of the rectification circuit 401 is powered down. For example, the first control module 9041 may detect the input voltage at the primary side of the transformer 402 to identify whether the input of the rectifier circuit 401 is powered down. When the first control module 9041 detects a power down of the input of the rectifier circuit 401, it notifies the second control module 9042. The second control module 9042 controls the switch unit 4052 to be turned on by sending a discharge control signal to the switch unit 4052, so as to discharge the energy storage capacitor 403 through the resistor 4051.

In addition, in some embodiments, whether the input terminal of the rectifying circuit 401 is powered down may also be detected by the second control module 9042. For example, the second control module 9042 may identify whether the input of the rectifier circuit 401 is powered down by detecting the output voltage on the secondary side of the transformer 402. When the second control module 9042 detects that the input end of the rectifying circuit 401 is powered down, the switching unit 4052 is controlled to be turned on by sending a discharge control signal to the switching unit 4052, so that the energy storage capacitor 403 is discharged through the resistor 4051.

Fig. 10 is a schematic diagram illustrating still another power supply apparatus according to an exemplary embodiment. Unlike the power supply device 90 shown in fig. 9, in the power supply device 100 shown in fig. 10, the discharge circuit 1005 includes: resistor 10051. One end of the resistor 10051 is connected to one end of the energy storage capacitor 403, and the other end is connected to the second control module 9042 and is grounded through the second control module 9042. After detecting that the power supply apparatus 100 is disconnected from the ac power supply, the first control module 9041 or the second control module 9042 discharges the energy storage capacitor 403 through the resistor 10051. For example, the resistor 10051 is connected to a switching tube inside the second control module 9042, and is grounded through the switching tube. After the first control module 9041 or the second control module 9042 detects that the power supply device 70 is disconnected from the ac power supply, the second control module 9042 controls the switching tube inside to be turned on, so as to discharge the energy storage capacitor 403 through the resistor 10051 connected in parallel to the energy storage capacitor 403.

Currently, in some power adapters, a switch unit is provided on the secondary side, and when the power adapter is abnormal (for example, the adapter generates heat seriously), the switch unit on the secondary side is controlled to control the power adapter to turn off the output. At this time, if the user finds that the power adapter has no output, the user may choose to unplug the power adapter and then plug it again. But since the power adapter output has been turned off, there is little energy output on the secondary side and power consumption is extremely low. Some power adapters may even enter sleep mode to further reduce power consumption. At this time, if the power adapter is pulled out, the energy storage capacitor in the power adapter discharges very slowly, and the discharge time may even reach several hours or even overnight. Because the power adapter can not be completely discharged, when the user plugs the power adapter again, the power adapter can not work, and the user can judge that the power adapter is thoroughly damaged, so that the user experience is reduced.

The embodiment of the disclosure can effectively solve the above problem by arranging the discharge circuit on the secondary side of the transformer. The secondary-side switch unit may be provided in any of the power supply devices described above, and fig. 11 shows a configuration of a power supply device including the secondary-side switch unit, taking the configuration of the power supply device 100 shown in fig. 10 as an example.

As shown in fig. 11, the power supply apparatus 110 further includes: the switch unit 1109 is connected between the energy storage capacitor 403 and the charging interface 406, a control end of the switch unit 1109 is connected to the second control module 9042, and the second control module 9042 is further configured to control the switch unit 1109 to turn off when detecting that the power supply apparatus 110 is abnormal (for example, the temperature exceeds a preset temperature threshold), so as to turn off the output of the power supply apparatus 110, and avoid problems such as safety and the like caused by the abnormality.

When the first control module 9041 or the second control module 9042 detects that the power supply apparatus 100 is disconnected from the ac power supply, the energy storage capacitor 403 is discharged through the resistor 10051. For example, the resistor 10051 is connected to a switching tube inside the second control module 9042, and is grounded through the switching tube. After the first control module 9041 or the second control module 9042 detects that the power supply device 70 is disconnected from the ac power supply, the second control module 9042 controls the switching tube inside to be turned on, so as to discharge the energy storage capacitor 403 through the resistor 10051 connected in parallel to the energy storage capacitor 403.

The power supply device provided by the embodiment of the disclosure can effectively solve the problem that the energy in the energy storage capacitor cannot be released quickly due to the fact that the switch unit 1109 is turned off by arranging the discharge circuit on the secondary side of the transformer.

It should be noted that although fig. 11 illustrates the structure of the power supply apparatus shown in fig. 10 as an example, the switch unit 1109 may also be disposed in any of the power supply apparatuses provided in the embodiments of the present disclosure, and the problem that the energy in the energy storage capacitor cannot be quickly released due to the turn-off of the switch unit 1109 can be solved by the discharge circuit disposed on the secondary side of the transformer in any of the power supply apparatuses provided in the embodiments of the present disclosure.

The following are embodiments of the disclosed method, which may be applied to embodiments of the disclosed apparatus. For details not disclosed in the embodiments of the disclosed method, refer to the embodiments of the disclosed apparatus.

Fig. 12 is a flow chart illustrating a charge control method according to an exemplary embodiment. The charging control method may be applied to the power supply device provided in the embodiment of the present disclosure.

Referring to fig. 12, the charge control method 120 includes:

in step S1201, the received ac voltage is converted into a first dc voltage on the primary side of the transformer of the power supply apparatus.

The first direct current has a voltage value of a first direct current voltage, such as a pulsating direct current voltage.

In step S1202, the first dc voltage is converted into a second dc voltage by a transformer.

The second dc voltage is a pulsating dc voltage as well.

In step S1203, a second dc voltage is stored and output on the secondary side of the transformer through the first energy storage capacitor of the power supply device.

In step S1204, when it is detected that the input terminal of the rectifying circuit of the power supply device is powered down, the first energy storage capacitor is discharged through the discharging circuit of the power supply device.

In the charge control method provided by the embodiment of the disclosure, the discharge circuit is arranged on the secondary side of the transformer, and when the disconnection between the power supply device and the alternating current power supply is identified, the discharge circuit is controlled to discharge, so that the residual electric energy in the energy storage capacitor is released, the voltage is reduced to zero, the electric shock damage of the power supply device can be avoided, and the abnormal logic control of the power supply device can also be avoided.

Fig. 13 is a flow chart illustrating another charge control method according to an exemplary embodiment. The charging control method may be applied to the power supply device provided in the embodiment of the present disclosure. Unlike the charging control method 120 shown in fig. 12, the charging control method 130 shown in fig. 13 may further include:

in step S1305, when it is detected that the power supply apparatus is abnormal, the first switch unit connected between the first energy storage capacitor and the charging interface of the power supply apparatus is controlled to be turned off.

The charging control method provided by the embodiment of the disclosure further can disconnect the output of the power supply device through the switch unit when detecting that the power supply device is abnormal, thereby avoiding dangers, such as explosion and other dangers, caused by overhigh temperature of the power supply device.

Fig. 14 is a flowchart illustrating yet another charge control method according to an exemplary embodiment. The charging control method may be applied to the power supply device provided in the embodiment of the present disclosure. Unlike the charging control method 120 shown in fig. 12, the charging control method 140 shown in fig. 14 may further include:

in step S1405, a first dc voltage is stored and output to the primary winding of the transformer through the second energy storage capacitor of the power supply apparatus on the primary side of the transformer.

Fig. 15 is a flowchart illustrating yet another charge control method according to an exemplary embodiment. The charging control method may be applied to the power supply device provided in the embodiment of the present disclosure.

Referring to fig. 15, the charge control method 150 includes:

in step S1501, the received ac voltage is converted into a first dc voltage on the primary side of the transformer of the power supply apparatus.

The first direct current has a voltage value of a first direct current voltage, such as a pulsating direct current voltage.

In step S1502, a PWM signal is output to the primary winding of the transformer to control the transformer to convert the first dc voltage into the second dc voltage.

In step S1503, the first dc voltage is converted into a second dc voltage by a transformer.

The second dc voltage is a pulsating dc voltage as well.

In step S1504, a second dc voltage is stored and output on the secondary side of the transformer through the first energy storage capacitor of the power supply apparatus.

In step S1505, when detecting that the input terminal of the rectifying circuit of the power supply device is powered down, sending a discharging control signal to the control terminal of the second switch unit in the discharging circuit; when the second switch unit receives the discharge control signal, the second switch unit is conducted to discharge the first energy storage capacitor through the resistor in the discharge circuit.

Fig. 16 is a flowchart illustrating yet another charge control method according to an exemplary embodiment. The charging control method may be applied to the power supply device provided in the embodiment of the present disclosure.

Referring to fig. 16, a charge control method 160 includes:

in step S1601, the received ac voltage is converted into a first dc voltage on the primary side of the transformer of the power supply apparatus.

The first direct current has a voltage value of a first direct current voltage, such as a pulsating direct current voltage.

In step S1602, the first control module of the power supply apparatus outputs a PWM signal to the primary winding of the transformer to control the transformer to convert the first dc voltage into the second dc voltage.

In step S1603, the first direct-current voltage is converted into a second direct-current voltage by a transformer.

The second dc voltage is a pulsating dc voltage as well.

In step S1604, a second dc voltage is stored and output on the secondary side of the transformer through the first energy storage capacitor of the power supply device.

In step S1605, feedback information of the device to be charged connected through the charging interface is received through the second control module of the power supply apparatus.

In some embodiments, the feedback information comprises: the charging method includes the steps that a charging voltage value and/or a charging current value expected by a device to be charged are/is obtained, or an adjusting instruction generated by the device to be charged based on the expected charging voltage value and/or the charging current value is obtained.

In step S1606, the first control module is controlled to adjust the pulse width or frequency of the PWM signal according to the feedback information.

In step S1607, it is detected whether the input terminal of the rectifier circuit is powered down through the first control module, and when it is detected that the input terminal of the rectifier circuit is powered down, a discharge control signal is transmitted to the second control module of the power supply device.

In step S1608, when the second control module receives the discharging control signal, the first energy storage capacitor is discharged through the resistor in the discharging circuit.

Fig. 17 is a flowchart illustrating yet another charge control method according to an exemplary embodiment. The charging control method may be applied to the power supply device provided in the embodiment of the present disclosure.

Referring to fig. 17, the charge control method 170 includes:

in step S1701, the received ac voltage is converted into a first dc voltage on the primary side of the transformer of the power supply apparatus.

The first direct current has a voltage value of a first direct current voltage, such as a pulsating direct current voltage.

In step S1702, a first control module of a power supply apparatus outputs a PWM signal to a primary winding of a transformer to control the transformer to convert a first dc voltage into a second dc voltage.

In step S1703, the first dc voltage is converted into a second dc voltage by a transformer.

The second dc voltage is a pulsating dc voltage as well.

In step S1704, a second dc voltage is stored and output on the secondary side of the transformer through the first energy storage capacitor of the power supply device.

In step S1705, feedback information of the device to be charged connected through the charging interface is received through the second control module of the power supply apparatus.

In some embodiments, the feedback information comprises: the charging method includes the steps that a charging voltage value and/or a charging current value expected by a device to be charged are/is obtained, or an adjusting instruction generated by the device to be charged based on the expected charging voltage value and/or the charging current value is obtained.

In step S1706, the first control module is controlled to adjust the pulse width or the frequency of the PWM signal according to the feedback information.

In step S1607, whether the input terminal of the rectifying circuit is powered down is detected by the second control module.

In step S1608, when the input terminal of the rectifier circuit is detected to be powered down, the first energy storage capacitor is discharged through the resistor in the discharge circuit.

It is noted that the above-mentioned figures are merely schematic illustrations of processes involved in methods according to exemplary embodiments of the present disclosure and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.

Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (22)

1. A power supply apparatus, comprising:

a charging interface;

a transformer, comprising: a primary winding and a secondary winding;

the rectifying circuit is connected with the primary winding of the transformer and is used for converting the received alternating current into a first direct current; the voltage value of the first direct current is a first direct current voltage; the transformer is used for converting the first direct-current voltage into a second direct-current voltage;

the first energy storage capacitor is connected between the secondary winding of the transformer and the charging interface and used for storing and outputting the second direct-current voltage;

the control unit is used for detecting whether the input end of the rectifying circuit is powered down or not; and

and the discharge circuit is connected with the first energy storage capacitor and used for discharging the first energy storage capacitor when the control unit detects that the input end of the rectifying circuit is powered down.

2. The power supply device according to claim 1, further comprising: the first switch unit is connected between the first end of the first energy storage capacitor and the first end of the charging interface, and the control end of the first switch unit is connected with the control unit; the control unit is further used for controlling the first switch unit to be turned off when the power supply device is detected to be abnormal.

3. The power supply device according to claim 1, further comprising: and the second energy storage capacitor is connected between the rectifying circuit and the primary winding of the transformer and used for storing and outputting the first direct current voltage.

4. The power supply device according to claim 2 or 3, wherein a first end of the first energy storage capacitor is connected between a first end of the secondary winding and a first end of the charging interface, and a second end of the first energy storage capacitor is connected between a second end of the secondary winding and a second end of the charging interface and grounded;

the discharge circuit includes: a resistor and a second switch unit; the first end of the resistor is connected with the first end of the first energy storage capacitor, and the second end of the resistor is grounded through the second switch unit; the control end of the second switch unit is connected with the control unit;

the control unit is also used for sending a discharge control signal to the discharge circuit when detecting that the input end of the rectifying circuit is powered down; when the second switch unit receives the discharge control signal, the second switch unit is turned on to discharge the first energy storage capacitor through the resistor.

5. The power supply device according to claim 4, wherein the control unit is connected to the primary winding of the transformer and further configured to output a PWM signal to the primary winding of the transformer to control the transformer to convert the first dc voltage into the second dc voltage.

6. The power supply device according to claim 2 or 3, wherein a first end of the first energy storage capacitor is connected between a first end of the secondary winding and a first end of the charging interface, and a second end of the first energy storage capacitor is connected between a second end of the secondary winding and a second end of the charging interface and grounded;

the discharge circuit includes: a resistance; the control unit includes: the system comprises a first control module and a second control module; the second control module is respectively connected with the first control module and the charging interface; the first end of the resistor is connected with the first end of the first energy storage capacitor, and the second end of the resistor is grounded through the second control module;

the first control module is respectively connected with the primary winding of the transformer and the second control module and is used for outputting a PWM signal to the primary winding of the transformer to control the transformer to convert the first direct-current voltage into a second direct-current voltage; detecting whether the input end of the rectifying circuit is powered down, and sending the discharge control signal to the second control module when the input end of the rectifying circuit is powered down;

the second control module is further configured to discharge the first energy storage capacitor through the resistor when receiving the discharge control signal.

7. The power supply device according to claim 6, wherein the second control module is further configured to receive feedback information of a device to be charged connected through the charging interface, and control the first control module to adjust the pulse width or the frequency of the PWM signal according to the feedback information.

8. The power supply device according to claim 7, wherein the feedback information includes: the charging method comprises the following steps that a charging voltage value and/or a charging current value expected by the device to be charged are/is obtained, or an adjusting instruction generated by the device to be charged based on the expected charging voltage value and/or the charging current value.

9. The power supply device according to claim 2 or 3, wherein a first end of the first energy storage capacitor is connected between a first end of the secondary winding and a first end of the charging interface, and a second end of the first energy storage capacitor is connected between a second end of the secondary winding and a second end of the charging interface and grounded;

the discharge circuit includes: a resistance; the control unit includes: the system comprises a first control module and a second control module; the second control module is respectively connected with the first control module and the charging interface; the first end of the resistor is connected with the first end of the first energy storage capacitor, and the second end of the resistor is grounded through the second control module; the second control module is used for detecting whether the input end of the rectifying circuit is powered down or not and discharging the first energy storage capacitor through the resistor when the input end of the rectifying circuit is detected to be powered down;

the first control module is respectively connected with the primary winding of the transformer and the second control module and used for outputting PWM signals to the primary winding of the transformer to control the transformer to convert the first direct-current voltage into the second direct-current voltage.

10. The power supply device according to claim 9, wherein the second control module is further configured to receive feedback information of a device to be charged connected through the charging interface, and control the first control module to adjust the pulse width or the frequency of the PWM signal according to the feedback information.

11. The power supply device according to claim 10, wherein the feedback information includes: the charging method comprises the following steps that a charging voltage value and/or a charging current value expected by the device to be charged are/is obtained, or an adjusting instruction generated by the device to be charged based on the expected charging voltage value and/or the charging current value.

12. A charging control method is applied to a power supply device, and is characterized by comprising the following steps:

converting the received alternating-current voltage into a first direct-current voltage on a primary side of a transformer of the power supply device, wherein the voltage value of the first direct-current voltage is the first direct-current voltage;

converting the first direct-current voltage into a second direct-current voltage through the transformer;

on the secondary side of the transformer, the second direct-current voltage is stored and output through a first energy storage capacitor of the power supply device;

and when the input end of the rectifying circuit of the power supply device is detected to be powered off, the first energy storage capacitor is discharged through the discharging circuit of the power supply device.

13. The method of claim 12, further comprising:

when the power supply device is detected to be abnormal, the first switch unit connected between the first energy storage capacitor and the charging interface of the power supply device is controlled to be turned off.

14. The method of claim 12, further comprising:

and on the primary side of the transformer, storing and outputting the first direct-current voltage to a primary winding of the transformer through a second energy storage capacitor of the power supply device.

15. The method according to claim 13 or 14, wherein discharging the first energy storage capacitor through a discharge circuit of the power supply device when detecting that the input terminal of the rectifying circuit of the power supply device is powered down comprises:

when detecting that the input end of the rectifying circuit of the power supply device is powered off, sending a discharging control signal to the control end of a second switch unit in the discharging circuit; when the second switch unit receives the discharge control signal, the second switch unit is turned on to discharge the first energy storage capacitor through the resistor in the discharge circuit.

16. The method of claim 15, further comprising:

and outputting a PWM signal to a primary winding of the transformer to control the transformer to convert the first direct-current voltage into a second direct-current voltage.

17. The method according to claim 13 or 14, wherein discharging the first energy storage capacitor through a discharge circuit of the power supply device when detecting that the input terminal of the rectifying circuit of the power supply device is powered down comprises:

detecting whether the input end of the rectifying circuit is powered down or not through a first control module of the power supply device, and sending the discharging control signal to a second control module of the power supply device when the input end of the rectifying circuit is detected to be powered down;

and when the second control module receives the discharge control signal, the first energy storage capacitor is discharged through a resistor in the discharge circuit.

18. The method of claim 17, further comprising:

outputting a PWM signal to a primary winding of the transformer through the first control module to control the transformer to convert the first direct-current voltage into a second direct-current voltage;

receiving feedback information of the equipment to be charged connected through the charging interface through the second control module;

and controlling the first control module to adjust the pulse width or frequency of the PWM signal according to the feedback information.

19. The method of claim 18, wherein the feedback information comprises: the charging method comprises the following steps that a charging voltage value and/or a charging current value expected by the device to be charged are/is obtained, or an adjusting instruction generated by the device to be charged based on the expected charging voltage value and/or the charging current value.

20. The method according to claim 13 or 14, wherein discharging the first energy storage capacitor through a discharge circuit of the power supply device when detecting that the input terminal of the rectifying circuit of the power supply device is powered down comprises:

detecting whether the input end of the rectifying circuit is powered down or not through a second control module of the power supply device;

and when the input end of the rectifying circuit is detected to be powered off, the first energy storage capacitor is discharged through a resistor in the discharging circuit.

21. The method of claim 20, further comprising:

outputting a PWM signal to a primary winding of the transformer through a first control module of the power supply device to control the transformer to convert the first direct-current voltage into a second direct-current voltage;

receiving feedback information of the equipment to be charged connected through the charging interface through the second control module;

and controlling a first control module of the power supply device to adjust the pulse width or frequency of the PWM signal according to the feedback information.

22. The method of claim 21, wherein the feedback information comprises: the charging method comprises the following steps that a charging voltage value and/or a charging current value expected by the device to be charged are/is obtained, or an adjusting instruction generated by the device to be charged based on the expected charging voltage value and/or the charging current value.

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