Power supply circuit and charging equipment

Abstract

The embodiment of the utility model discloses a power supply circuit and charging equipment, the power supply circuit comprises a first power supply end, a first power supply module, a second power supply end and a second power supply module, the first power supply module is provided with a first input end and a first output end, the first input end is connected with the first power supply end and receives power supplied by the first power supply end, and the second output end is connected with the second power supply end. The first output end is used for supplying power to the outside; the second power supply module is provided with a second input end and a second output end, the second input end is connected with the second power supply end, and the second output end is connected with the first input end; wherein the voltage of the second power supply end is higher than or equal to that of the first power supply end, and the voltage of the first power supply end is higher than that of the second output end. When power supply of the first input end fails, the second power supply module takes power from the second power supply end, so that power is supplied to the first power supply module, and the stability and reliability of the power supply circuit are improved.

Description

Technical Field

[0001] This application relates to the field of charging devices, and particularly to a power supply circuit and a charging device. Background Art

[0002] With the development of charging technology, the functions of chargers are becoming more and more abundant. For example, a microprocessor is provided in the charger, and the microprocessor can adjust the charging power of the charger. A display screen is provided on the charger, and the display screen can display information such as voltage, current, or power.

[0003] In the related art, the driving voltages of the microprocessor and the display screen are different from the voltage of the charger output port. Therefore, an auxiliary power supply circuit needs to be provided to supply power to the microprocessor, the display screen, etc. However, the auxiliary power supply circuit is prone to failure, thus affecting the use of the charger. Summary of the Utility Model

[0004] An embodiment of this application provides a power supply circuit and a charging device, which can improve the reliability of power supply.

[0005] In a first aspect, an embodiment of this application provides a power supply circuit. The power supply circuit includes a first power supply terminal, a first power supply module, a second power supply terminal, and a second power supply module. The first power supply module has a first input terminal and a first output terminal. The first input terminal is connected to the first power supply terminal and receives the power supply from the first power supply terminal. The first output terminal is used for supplying power externally. The second power supply module has a second input terminal and a second output terminal. The second input terminal is connected to the second power supply terminal, and the second output terminal is connected to the first input terminal. Wherein, the voltage of the second power supply terminal is higher than or equal to the voltage of the first power supply terminal, and the voltage of the first power supply terminal is higher than the voltage of the second output terminal. When an abnormality occurs at the first power supply terminal, the second power supply module supplies power to the first power supply module.

[0006] In a second aspect, an embodiment of this application provides a charging device. The charging device includes a power supply circuit, a first connection terminal, a second connection terminal, and a control module. The first power supply terminal is electrically connected to the first connection terminal; the second power supply terminal is electrically connected to the second connection terminal, and the voltage of the second connection terminal is greater than or equal to the voltage of the first connection terminal; the control module is connected to the first output terminal.

[0007] Advantageous Effects: In the embodiment of this application, the second power supply module serves as a backup power supply for the first power supply module. When the power supply at the first input terminal fails, the second power supply module draws power from the second power supply terminal, thereby supplying power to the first power supply module to improve the stability and reliability of the power supply circuit. Description of the Drawings

[0008] To more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0009] Figure 1 Schematic diagram of the structure of a charging device in an embodiment of the present application;

[0010] Figure 2 Block diagram of a power supply circuit in an embodiment of the present application;

[0011] Figure 3 Block diagram of a power supply circuit in another embodiment of the present application;

[0012] Figure 4 Block diagram of a power supply circuit in yet another embodiment of the present application;

[0013] Figure 5 Circuit diagram of a power supply circuit in yet another embodiment of the present application.

[0014] Explanation of reference numerals: 100, power supply circuit; 110, first power supply terminal; 120, first power supply module; 121, first input terminal; 122, first output terminal; 123, first voltage stabilizing unit; 124, first filtering module; 130, second power supply terminal; 140, second power supply module; 141, second input terminal; 142, second output terminal; 143, second voltage stabilizing unit; 144, second step-down unit; 145, second filtering module; 150, first step-down unit;

[0015] D1, first diode; D2, second diode; D3, third diode; U1, first linear voltage regulator; U2, second linear voltage regulator; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; C5, fifth capacitor; C6, sixth capacitor;

[0016] 200, charging device; 210, first connection terminal; 220, second connection terminal. Detailed implementation manners

[0017] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] As Figure 1As shown in the figure, in the first aspect of the embodiment of the present application, a charging device 200 is provided. The charging device 200 can charge an electronic device, such as charging a mobile phone, a tablet computer, a laptop computer, etc. The charging device 200 includes a first connection terminal 210, a second connection terminal 220, an output module (not shown in the figure), a power supply circuit 100 (not shown in the figure), and a control module (not shown in the figure).

[0019] Both the first connection terminal 210 and the second connection terminal 220 are used for external output. The types of the first connection terminal 210 and the second connection terminal 220 are different, and the voltage of the second connection terminal 220 is greater than or equal to the voltage of the first connection terminal 210. Exemplarily, the first connection terminal 210 is a USB-A interface, and the output voltage of the first connection terminal 210 is 5V. The second connection terminal 220 is a USB-C interface, and the second connection terminal 220 can be compatible with the PD protocol. The output voltage of the second connection terminal 220 is 5V - 28V.

[0020] The output module is connected to both the first connection terminal 210 and the second connection terminal 220 to supply power to the first connection terminal 210 and the second connection terminal 220. The output module can be a rectification module. The rectification module is connected to both the first connection terminal 210 and the second connection terminal 220, and the rectification module can supply power to the first connection terminal 210 and the second connection terminal 220. At this time, the charging device 200 is a charger. Or the output module can be an energy storage module. The energy storage module is connected to both the first connection terminal 210 and the second connection terminal 220, and the energy storage module can supply power to the first connection terminal 210 and the second connection terminal 220. At this time, the charging device 200 is a mobile power supply. Or, the output module can include both a rectification module and an energy storage module. The rectification module is connected to both the first connection terminal 210 and the second connection terminal 220, and the rectification module can supply power to the first connection terminal 210 and the second connection terminal 220. The energy storage module is connected to both the first connection terminal 210 and the second connection terminal 220, and the energy storage module can supply power to the first connection terminal 210 and the second connection terminal 220. And the rectification module is connected to the energy storage module, and the rectification module can charge the energy storage module. At this time, the charging device 200 has the functions of both a charger and a mobile power supply.

[0021] The control module is used to control the operation of the output module to adjust parameters such as the output voltage and current of the output module. Exemplarily, the control module can communicate with an external load to negotiate charging parameters. Or, the charging device 200 can also include a display screen, and the control module can drive the display screen to display relevant information. Exemplarily, the display screen can display parameters such as the output voltage and current. When the charging device 200 is a mobile power supply, the display screen can also display parameters such as the remaining battery level. By setting the display screen, it is possible to intuitively understand the operating state of the charging device 200.

[0022] Generally speaking, the output voltage of the output module does not match the required voltages of the control module and the display screen. Therefore, a power supply circuit 100 needs to be set up. The power supply circuit 100 supplies power to the control module, the display screen, etc. Exemplarily, the output voltage of the output module is greater than or equal to 5V, while the driving voltages of the control module, the display screen, etc. are usually 3.3V. The power supply circuit 100 can draw power from the output module, and after stepping down the voltage, supply power to the control module, the display screen, etc.

[0023] As Figure 2 shown, in the second aspect of the embodiments of the present application, a power supply circuit 100 is provided. The power supply circuit 100 includes: a first power supply terminal 110, a first power supply module 120, a second power supply terminal 130, and a second power supply module 140.

[0024] The first power supply terminal 110 is used to supply power to the first power supply module 120. The first power supply terminal 110 can be electrically connected to a first connection terminal 210 (see Figure 1 ) to draw power from the first connection terminal 210.

[0025] The first power supply module 120 has a first input terminal 121 and a first output terminal 122. The first input terminal 121 is connected to the first power supply terminal 110, and the first output terminal 122 is used to supply power externally, such as supplying power to the control module and the display screen mentioned above. Exemplarily, the first power supply module 120 can step down the voltage of 5V to 3.3V.

[0026] The second power supply terminal 130 is used to supply power to the second power supply module 140. The second power supply terminal 130 can be electrically connected to a second connection terminal 220 (see Figure 1 ) to draw power from the second connection terminal 220. The voltage of the second power supply terminal 130 is higher than or equal to the voltage of the first power supply terminal 110. Exemplarily, the second power supply module 140 can step down the voltage of 28V to 4.2V.

[0027] The second power supply module 140 has a second input terminal 141 and a second output terminal 142. The second input terminal 141 is connected to the second power supply terminal 130, and the second output terminal 142 is connected to the first input terminal 121. The voltage of the first power supply terminal 110 is higher than the voltage that the second output terminal 142 can output. Both the first power supply module 120 and the second power supply module 140 can play the role of stepping down the voltage. However, it should be noted that the greater the voltage difference across the first power supply module 120, the greater the loss of the first power supply module 120 and the lower the efficiency. The greater the voltage difference across the second power supply module 140, the greater the loss of the second power supply module 140 and the lower the efficiency.

[0028] During normal operation, since the voltage of the first power supply terminal 110 is higher than the voltage that the second output terminal 142 can output, the first power supply terminal 110 supplies power to the first power supply module 120, and the second power supply module 140 does not supply power to the first power supply module 120. Since the voltage of the first power supply terminal 110 is relatively lower than that of the second power supply terminal 130, the first power supply module 120 draws power from the first power supply terminal 110, and the voltage difference across the first power supply module 120 is relatively small. At this time, the second power supply terminal 130 does not need to work, thereby reducing the loss of the power supply circuit 100.

[0029] Exemplarily, the working current of the mainstream display screen on the charging device 200 is about 15 mA to 20 mA, and the working current of the control module is about 2 mA to 5 mA. Therefore, the two together require about 17 mA to 25 mA, and their supply voltage is generally 3.3 V. If the first power supply module 120 collects voltage from the second power supply terminal 130 with a voltage of 5V - 28V, when the second power supply terminal 130 outputs 28V, the power of the power supply circuit 100 is 25 mA * 28V = 0.7W, resulting in too large no-load loss of the charging device 200, and too large voltage drop across the first power supply module 120. The heating power of the first power supply module 120 is (28V - 3.3V) * 25 mA = 0.617W. General components on the market are difficult to meet the long-term high-power consumption work, and it is difficult to select a model for the first power supply module 120. However, the first power supply module 120 in the embodiment of the present application draws power from the first power supply terminal 110, and the power of the power supply circuit 100 is (5V - 3.3V) * 25 mA = 0.0425W, thereby reducing the standby power of the power supply circuit 100 and the no-load loss of the charging device 200.

[0030] The second power supply module 140 serves as a backup power supply for the first power supply module 120. When a power supply failure occurs at the first input terminal 121, for example, when the USB-A interface fails, the second power supply module 140 draws power from the second power supply terminal 130, for example, the second power supply module 140 draws power from the USB-C interface, so as to supply power to the first power supply module 120, thereby improving the stability and reliability of the power supply circuit 100. When the USB-A interface fails, an appropriate alarm prompt can be displayed on the display screen to remind the user to handle it.

[0031] Such as Figure 3As shown, in some embodiments, the power supply circuit 100 further includes a first buck unit 150. The first buck unit 150 is disposed between the first power supply terminal 110 and the first input terminal 121. The first power supply module 120 includes a first voltage regulator unit 123. The input terminal of the first voltage regulator unit 123 is the first input terminal 121, and the output terminal of the first voltage regulator unit 123 is the first output terminal 122. By providing the first buck unit 150, the voltage of the first power supply terminal 110 can be stepped down first, thereby reducing the voltage step-down amplitude of the first voltage regulator unit 123 and decreasing the heat generation of the first voltage regulator unit 123. Since the first voltage regulator unit 123 and the first buck unit 150 are spaced apart physically, the heat generated by the first voltage regulator unit 123 and the first buck unit 150 can be dispersed, so that the heat generation of the power supply circuit 100 is relatively uniform and concentrated heat generation is reduced.

[0032] Continuing to refer to Figure 3 , in some embodiments, the second power supply module 140 includes a second voltage regulator unit 143 and a second buck unit 144. The input terminal of the second voltage regulator unit 143 is the second input terminal 141. The output terminal of the second voltage regulator unit 143 is connected to the input terminal of the second buck unit 144, and the output terminal of the second buck unit 144 is the second output terminal 142. The second buck unit 144 can step down the voltage output by the second voltage regulator unit 143 so that the output voltage of the second output terminal 142 when the first buck unit 150 is turned off is lower than the output voltage of the first input terminal 121 when the second buck unit 144 is turned off. Moreover, by providing the second buck unit 144, the voltage difference across the second voltage regulator unit 143 can be reduced, thereby decreasing the heat generation of the second voltage regulator unit 143. Since the second voltage regulator unit 143 and the second buck unit 144 are spaced apart physically, the heat generated by the second voltage regulator unit 143 and the second buck unit 144 can be dispersed, so that the heat generation of the power supply circuit 100 is relatively uniform and concentrated heat generation is reduced. Additionally, the second buck unit 144 undertakes part of the voltage step-down function. By changing the step-down amplitude of the second buck unit 144, the step-down amplitude of the second voltage regulator unit 143 can be changed, making the selection of the second voltage regulator unit 143 more flexible.

[0033] In some embodiments, when the second step-down unit 144 is turned off, the output terminal of the first step-down unit 150 outputs a first voltage value. When the first step-down unit 150 is turned off, the output terminal of the second step-down unit 144 outputs a second voltage value. The voltage at the output terminal of the second voltage regulation unit 143 is equal to the voltage of the first power supply terminal 110, so that the voltage difference between the first voltage value and the second voltage value is within a preset voltage value range. The preset voltage value range can be a relatively small range. For example, the preset voltage value range is 0.1V - 0.3V. Generally speaking, the output voltage of the second step-down unit 144 only needs to be slightly lower than the output voltage of the first step-down unit 150. By setting the voltage at the output terminal of the second voltage regulation unit 143 to be equal to the voltage of the first power supply terminal 110, the step-down amplitude of the second step-down unit 144 can be made slightly larger than that of the first step-down unit 150, reducing the step-down difference between the first step-down unit 150 and the second step-down unit 144. This enables components with a small step-down amplitude to be selected for both the first step-down unit 150 and the second step-down unit 144, thereby reducing the heat generation and power loss of the first step-down unit 150 and the second step-down unit 144 and improving the efficiency of the power supply circuit 100. Additionally, components with a small step-down amplitude can be selected for both the first step-down unit 150 and the second step-down unit 144. When the first step-down unit 150 or the second step-down unit 144 fails, the impact on the power supply circuit 100 can be relatively small.

[0034] As Figure 4 shown, in some embodiments, the first power supply module 120 further includes a first filtering module 124. The first filtering module 124 is connected to both the input terminal and the output terminal of the first voltage regulation unit 123. The first filtering module 124 can filter both the input terminal and the output terminal of the first voltage regulation unit 123, so that a relatively pure current can be input to the input terminal of the first voltage regulation unit 123, and a relatively pure current can be output from the output terminal of the first voltage regulation unit 123.

[0035] The second power supply module 140 further includes a second filtering module 145. The second filtering module 145 is connected to both the input terminal and the output terminal of the second voltage regulation unit 143. The second filtering module 145 can filter both the input terminal and the output terminal of the second voltage regulation unit 143, so that a relatively pure current can be input to the input terminal of the second voltage regulation unit 143, and a relatively pure current can be output from the output terminal of the second voltage regulation unit 143.

[0036] As Figure 5As shown, in some embodiments, the first step-down unit 150 includes a first diode D1. The positive electrode of the first diode D1 is connected to the first power supply terminal 110, and the negative electrode is connected to the input terminal of the first voltage regulation unit 123. The first diode D1 can play a role in step-down and can prevent the voltage of the second output terminal 142 from flowing back when the first power supply terminal 110 fails, improving the safety of the first power supply terminal 110.

[0037] The second step-down unit 144 includes a second diode D2 and a third diode D3. The positive electrode of the second diode D2 is connected to the output terminal of the second voltage regulation unit 143. The positive electrode of the third diode D3 is connected to the negative electrode of the second diode D2, and the negative electrode of the third diode D3 is connected to the negative electrode of the first diode D1. The second step-down unit 144 includes two diodes, and different step-down amplitudes can be combined by adjusting the models of the two diodes. Moreover, the probability that the two diodes are damaged simultaneously is relatively small, so the risk can be dispersed, and the impact on the power supply circuit 100 when the second step-down unit 144 is damaged can be reduced.

[0038] In some embodiments, the voltage drop of the first diode D1 is the same as that of the second diode D2, or the voltage drop of the first diode D1 is the same as that of the third diode D3. Exemplarily, the model of the first diode D1 is the same as that of the second diode D2, and the voltage drop of the first diode D1 is the same as that of the second diode D2. The total step-down amplitude of the superposition of the second diode D2 and the third diode D3 is greater than the step-down amplitude of the first diode D1. That is, it can be ensured that the step-down amplitude of the second step-down unit 144 is greater than that of the first step-down unit 150. When the output voltage of the second voltage regulation unit 143 is the same as the supply voltage of the first power supply terminal 110, it can be ensured that the voltage of the second output terminal 142 is lower than the output voltage of the first step-down unit 150. Moreover, since the model of the first diode D1 is the same as that of the second diode D2, the procurement cost can also be saved.

[0039] Optionally, the models of the first diode D1, the second diode D2, and the third diode D3 are all the same, so as to further save the procurement cost on the basis of ensuring that the voltage of the second output terminal 142 is lower than the output voltage of the first step-down unit 150.

[0040] Continue to refer to Figure 5 , in some embodiments, the first voltage regulation unit 123 includes a first linear voltage regulator U1. The first linear voltage regulator U1 includes a first input pin Vin, a first output pin Vout, and a first ground pin Vss. The first input pin Vin is the first input terminal 121, the first output pin Vout is the first output terminal 122, and the first ground pin Vss is grounded.

[0041] The second voltage stabilizing unit 143 includes a second linear voltage regulator U2. The second linear voltage regulator U2 includes a second input pin Vin, a second output pin Vout, and a second ground pin Vss. The second input pin Vin is the second input terminal 141, the second output pin Vout is the second output terminal 142, and the second ground pin Vss is grounded.

[0042] Continue to refer to Figure 5 , in some embodiments, the first filtering module 124 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4.

[0043] One end of the first capacitor C1 is connected to the input terminal of the first voltage stabilizing unit 123, and the other end is grounded. One end of the second capacitor C2 is connected to the input terminal of the first voltage stabilizing unit 123, and the other end is grounded. The first capacitor C1 and the second capacitor C2 filter the input terminal of the first voltage stabilizing unit 123.

[0044] One end of the third capacitor C3 is connected to the output terminal of the first voltage stabilizing unit 123, and the other end is grounded. One end of the fourth capacitor C4 is connected to the output terminal of the first voltage stabilizing unit 123, and the other end is grounded. The third capacitor C3 and the fourth capacitor C4 filter the output terminal of the first voltage stabilizing unit 123.

[0045] The second filtering module 145 includes a fifth capacitor C5 and a sixth capacitor C6. One end of the fifth capacitor C5 is connected to the input terminal of the second voltage stabilizing unit 143, and the other end is grounded. One end of the sixth capacitor C6 is connected to the output terminal of the second voltage stabilizing unit 143, and the other end is grounded. The fifth capacitor C5 filters the input terminal of the second voltage stabilizing unit 143, and the sixth capacitor C6 filters the output terminal of the second voltage stabilizing unit 143.

[0046] Since the first voltage stabilizing unit 123 has a higher usage probability than the second voltage stabilizing unit 143, two sets of capacitors are provided at both the input terminal and the output terminal of the first voltage stabilizing unit 123 to improve the filtering effect. A single set of capacitors is provided at both the input terminal and the output terminal of the second voltage stabilizing unit 143 to save costs.

[0047] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of this application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0048] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A power supply circuit, characterized in that: include: a first power supply terminal; A first power supply module, having a first input end and a first output end, the first input end is connected to the first power supply end and receives power from the first power supply end, and the first output end is used to supply power to an external device; A second power supply terminal; and A second power supply module, having a second input end and a second output end, wherein the second input end is connected to the second power supply end, and the second output end is connected to the first input end; Among them, the voltage of the second power supply end is higher than or equal to the voltage of the first power supply end, the voltage of the first power supply end is higher than the voltage of the second output end, and when an abnormality occurs in the first power supply end, the second power supply module supplies power to the first power supply module.

2. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes a first step-down unit, which is arranged between the first power supply end and the first input end. The first power supply module includes a first voltage stabilizing unit, the input end of the first voltage stabilizing unit is the first input end, and the output end of the first voltage stabilizing unit is the first output end.

3. The power supply circuit according to claim 2, characterized in that: The second power supply module includes a second voltage stabilizing unit and a second voltage step-down unit, the input end of the second voltage stabilizing unit is the second input end, the output end of the second voltage stabilizing unit is connected to the input end of the second voltage step-down unit, and the output end of the second voltage step-down unit is the second output end.

4. The power supply circuit according to claim 3, characterized in that: When the second step-down unit is turned off, the output end of the first step-down unit outputs a first voltage value, and when the first step-down unit is turned off, the output end of the second step-down unit outputs a second voltage value, and the voltage of the output end of the second voltage stabilizing unit is equal to the voltage of the first power supply end, so that the voltage difference between the first voltage value and the second voltage value is within a preset voltage value range.

5. The power supply circuit according to claim 4, characterized in that: The first voltage-reducing unit includes a first diode, wherein an anode of the first diode is connected to the first power supply end, and a cathode of the first diode is connected to an input end of the first voltage-stabilizing unit; The second step-down unit comprises: a second diode, wherein an anode of the second diode is connected to an output end of the second voltage stabilizing unit; and A third diode, wherein an anode of the third diode is connected to the cathode of the second diode, and a cathode of the third diode is connected to the cathode of the first diode.

6. The power supply circuit according to claim 5, characterized in that: A voltage drop of the first diode is the same as a voltage drop of the second diode, or a voltage drop of the first diode is the same as a voltage drop of the third diode.

7. The power supply circuit according to claim 3, characterized in that: The first voltage stabilizing unit includes a first linear voltage regulator, the first linear voltage regulator includes a first input pin, a first output pin and a first ground pin, the first input pin is the first input end, the first output pin is the first output end, and the first ground pin is grounded; The second voltage stabilizing unit includes a second linear regulator, which includes a second input pin, a second output pin and a second ground pin, the second input pin is the second input end, the second output pin is connected to the input end of the second step-down unit, and the second ground pin is grounded.

8. The power supply circuit according to claim 3, characterized in that: The first power supply module further includes a first filter module, and the first filter module is connected to both the input end and the output end of the first voltage stabilizing unit; The second power supply module further includes a second filter module, and the second filter module is connected to both the input end and the output end of the second voltage stabilizing unit.

9. The power supply circuit according to claim 8, characterized in that: The first filtering module comprises: A first capacitor, one end of the first capacitor is connected to the input end of the first voltage stabilizing unit, and the other end is grounded; A second capacitor, one end of the second capacitor is connected to the input end of the first voltage stabilizing unit, and the other end is grounded; A third capacitor, one end of which is connected to the output end of the first voltage stabilizing unit, and the other end of which is grounded; and a fourth capacitor, one end of the third capacitor being connected to the output end of the first voltage stabilizing unit and the other end being grounded; The second filtering module comprises: a fifth capacitor, one end of which is connected to the input end of the second voltage stabilizing unit, and the other end of which is grounded; and A sixth capacitor, one end of the sixth capacitor is connected to the output end of the second voltage stabilizing unit, and the other end is grounded.

10. A charging device, characterized in that: include: The power supply circuit according to any one of claims 1 to 9; a first connecting terminal, the first power supply end being electrically connected to the first connecting terminal; a second connection terminal, the second power supply end being electrically connected to the second connection terminal, and a voltage of the second connection terminal being greater than or equal to a voltage of the first connection terminal; and A control module is connected to the first output end, and the first output end supplies power to the control module.

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