Power supply circuit and charging device

Abstract

Disclosed in the embodiments of the present application are a power supply circuit and a charging device. 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, wherein the first power supply module has a first input end and a first output end, the first input end is connected to the first power supply end and receives power supplied by the first power supply end, and the first output end is configured to supply power to the outside; the second power supply module has a second input end and a second output end, the second input end is connected to the second power supply end, and the second output end is connected to the first input end; and the voltage of the second power supply end is higher than or equal to the voltage of the first power supply end, and the voltage of the first power supply end is higher than the voltage of the second output end. When the power supply of the first input end fails, the second power supply module obtains power from the second power supply end, so as to supply power to the first power supply module, thereby improving the stability and reliability of the power supply circuit.

Description

Power supply circuit and charging equipment

[0001] This application claims priority to Chinese Patent Application No. 2024216997654, filed on July 17, 2024, entitled "Power Supply Circuit and Charging Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of charging equipment, and more particularly to a power supply circuit and a charging device. Background Technology

[0003] With the development of charging technology, chargers are becoming more and more functional. For example, chargers are equipped with microprocessors that can adjust the charging power, and they are equipped with displays that can show information such as voltage, current, or power.

[0004] In related technologies, the driving voltage of the microprocessor and display screen differs from the voltage at the charger's output port, thus requiring an auxiliary power supply circuit to power the microprocessor, display screen, etc. However, the auxiliary power supply circuit is prone to failure, thereby affecting the charger's operation. Summary of the Invention

[0005] This application provides a power supply circuit and a charging device that can improve the reliability of power supply.

[0006] In a first aspect, embodiments of this application provide a power supply circuit, which 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 power from the first power supply terminal, and the first output terminal is configured to supply 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. 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 the first power supply terminal malfunctions, the second power supply module supplies power to the first power supply module.

[0007] Based on the power supply circuit of this application embodiment, 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 to supply power to the first power supply module, thereby improving the stability and reliability of the power supply circuit. During normal operation, since the voltage at the first power supply terminal is higher than the voltage that the second output terminal can output, the first power supply terminal supplies power to the first power supply module, and the second power supply module does not supply power to the first power supply module. Because the voltage at the first power supply terminal is relatively lower than that at the second power supply terminal, the first power supply module draws power from the first power supply terminal, and the voltage difference across the first power supply module is relatively small. At this time, the second power supply terminal does not need to work, thereby reducing the power supply circuit losses.

[0008] Secondly, embodiments of this application provide a charging device, which 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.

[0009] Based on the power supply circuit of this application embodiment, 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 to supply power to the first power supply module, thereby improving the stability and reliability of the power supply circuit and thus enhancing the stability and reliability of the charging device. During normal operation, since the voltage at the first power supply terminal is higher than the voltage that the second output terminal can output, the first power supply terminal supplies power to the first power supply module, and the second power supply module does not supply power to the first power supply module. Because the voltage at the first power supply terminal is relatively lower than that at the second power supply terminal, the first power supply module draws power from the first power supply terminal, and the voltage difference across the first power supply module is relatively small. At this time, the second power supply terminal does not need to operate, thereby reducing power supply circuit losses and thus reducing standby power consumption of the charging device. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 is a schematic diagram of the structure of a charging device in one embodiment of this application;

[0012] Figure 2 is a block diagram of a charging device in one embodiment of this application;

[0013] Figure 3 is a block diagram of a power supply circuit in one embodiment of this application;

[0014] Figure 4 is a block diagram of the power supply circuit in another embodiment of this application;

[0015] Figure 5 is a block diagram of the power supply circuit in another embodiment of this application;

[0016] Figure 6 is a circuit diagram of the power supply circuit in another embodiment of this application.

[0017] Explanation of reference numerals in the attached drawings: 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 regulator unit; 124, first filter module; 130, second power supply terminal; 140, second power supply module; 141, second input terminal; 142, second output terminal; 143, second voltage regulator unit; 144, second buck unit; 145, second filter module; 150, first buck unit; D1, first diode; D2, second diode; D3, third diode; U1, first linear regulator; U2, second linear regulator; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; C5, fifth capacitor; C6, sixth capacitor; 200, charging device; 210, first connection terminal; 220, second connection terminal; 230, output module; 240, control module. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0019] As shown in Figures 1 and 2, a first aspect of this application provides a charging device 200, which can charge electronic devices, such as mobile phones, tablets, or laptops. The charging device 200 includes a first connection terminal 210, a second connection terminal 220, an output module 230, a power supply circuit 100 (not shown in the figures), and a control module 240.

[0020] Both the first connection terminal 210 and the second connection terminal 220 are configured for external output. The first connection terminal 210 and the second connection terminal 220 are of different types, and the voltage of the second connection terminal 220 is greater than or equal to the voltage of the first connection terminal 210. For example, the first connection terminal 210 is a USB-A interface with an output voltage of 5V. The second connection terminal 220 is a USB-C interface, compatible with the PD protocol, and its output voltage is 5V-28V.

[0021] The output module 230 is connected to both the first connection terminal 210 and the second connection terminal 220 to supply power to them. Alternatively, the output module 230 can be a rectifier module, connected to both the first and second connection terminals 210 and 220, providing power to them; in this case, the charging device 200 functions as a charger. Or, the output module 230 can be an energy storage module, connected to both the first and second connection terminals 210 and 220, providing power to them; in this case, the charging device 200 functions as a power bank. Alternatively, the output module 230 may include both a rectifier module and an energy storage module. The rectifier module is connected to both the first connection terminal 210 and the second connection terminal 220, and the rectifier module can supply power to the first connection terminal 210 and the second connection terminal 220. The energy storage module is also 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. Furthermore, the rectifier module is connected to the energy storage module, and the rectifier module can charge the energy storage module. In this case, the charging device 200 functions as both a charger and a power bank.

[0022] The control module 240 is configured to control the operation of the output module 230 to adjust parameters such as the output voltage and current of the output module 230. For example, the control module 240 can communicate with an external load to negotiate charging parameters. Alternatively, the charging device 200 may include a display screen, and the control module 240 can drive the display screen to show relevant information. For example, the display screen can display parameters such as output voltage and current. When the charging device 200 is a power bank, the display screen can also display parameters such as remaining battery power. By setting up the display screen, the operating status of the charging device 200 can be intuitively understood.

[0023] Generally, the output voltage of the output module 230 does not match the required voltage of the control module 240 and the display screen. Therefore, a power supply circuit 100 is needed to supply power to the control module 240, the display screen, etc. For example, the output voltage of the output module 230 is greater than or equal to 5V, while the driving voltage of the control module 240, the display screen, etc. is usually 3.3V. The power supply circuit 100 can draw power from the output module 230, step it down, and then supply power to the control module 240, the display screen, etc.

[0024] As shown in Figure 3, a second aspect of this application provides a power supply circuit 100, which 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.

[0025] The first power supply terminal 110 is configured to supply power to the first power supply module 120. The first power supply terminal 110 can be electrically connected to the first connection terminal 210 (see Figure 1) to draw power from the first connection terminal 210.

[0026] 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 configured to provide power to external devices, such as the control module 240 and the display screen mentioned above. For example, the first power supply module 120 can step down a 5V voltage to 3.3V.

[0027] The second power supply terminal 130 is configured to supply power to the second power supply module 140. The second power supply terminal 130 can be electrically connected to the 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. For example, the second power supply module 140 is capable of stepping down a 28V voltage to 4.2V.

[0028] 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 at 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 serve as voltage reduction modules. However, it should be noted that the greater the voltage difference across the first power supply module 120, the greater its losses and the lower its efficiency. Similarly, the greater the voltage difference across the second power supply module 140, the greater its losses and the lower its efficiency.

[0029] During normal operation, since the voltage at 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. Because the voltage at the first power supply terminal 110 is relatively lower than that at the second power supply terminal 130, the first power supply module 120 draws power from the first power supply terminal 110. The voltage difference across the first power supply module 120 is relatively small, so the second power supply terminal 130 does not need to operate, thereby reducing losses in the power supply circuit 100.

[0030] For example, the mainstream display screen on the charging device 200 operates at a current of approximately 15mA to 20mA, and the control module 240 operates at a current of approximately 2mA to 5mA. Therefore, the combined current required is approximately 17mA to 25mA, and the supply voltage for both is generally 3.3V. If the first power supply module 120 samples voltage from the second power supply terminal 130 (5V-28V), when the second power supply terminal 130 outputs 28V, the power of the power supply circuit 100 is 25mA * 28V = 0.7W. This results in excessive no-load loss for the charging device 200 and excessive voltage drop across the first power supply module 120. The heat dissipation of the first power supply module 120 is (28V - 3.3V) * 25mA = 0.617W. Commonly available components cannot meet the requirements for long-term high-power operation, making it difficult to select the right first power supply module 120. In this embodiment of the application, the first power supply module 120 draws power from the first power supply terminal 110, and the power of the power supply circuit 100 is (5V-3.3V)*25mA=0.0425W, thereby reducing the standby power of the power supply circuit 100 and reducing the no-load loss of the charging device 200.

[0031] 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, such as when the USB-A interface fails, the second power supply module 140 draws power from the second power supply terminal 130, for example, from the USB-C interface, thereby supplying power to the first power supply module 120 and improving the stability and reliability of the power supply circuit 100. When a USB-A interface fails, a corresponding alarm message can be displayed on the screen to remind the user to take action.

[0032] As shown in Figure 4, in some embodiments, the power supply circuit 100 further includes a first step-down unit 150, which 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, with the first input terminal 121 as the input terminal and the first output terminal 122 as the output terminal. By setting the first step-down unit 150, the voltage of the first power supply terminal 110 can be stepped down first, thereby reducing the voltage reduction amplitude of the first voltage regulator unit 123 and reducing the heat generation of the first voltage regulator unit 123. Since the first voltage regulator unit 123 and the first step-down unit 150 are physically spaced apart, their heat generation can be dispersed, resulting in more uniform heat generation in the power supply circuit 100 and reducing concentrated heat generation.

[0033] Referring again 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, and the output terminal of the second voltage regulator unit 143 is connected to the input terminal of the second buck unit 144. The output terminal of the second buck unit 144 is the second output terminal 142. The second buck unit 144 can reduce the voltage output by the second voltage regulator unit 143 so that when the first buck unit 150 is turned off, the output voltage of the second output terminal 142 is lower than the output voltage of the first input terminal 121 when the second buck unit 144 is turned off. Moreover, by setting the second buck unit 144, the voltage difference across the second voltage regulator unit 143 can be reduced, thereby reducing the heat generation of the second voltage regulator unit 143. Because the second voltage regulator unit 143 and the second buck unit 144 are physically spaced apart, their heat generation can be dispersed, resulting in more uniform heat generation in the power supply circuit 100 and reducing concentrated heat generation. Furthermore, the second buck unit 144 performs part of the voltage reduction function; by changing the reduction rate of the second buck unit 144, the reduction rate of the second voltage regulator unit 143 can be changed, allowing for more flexible selection of the second voltage regulator unit 143.

[0034] 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, and 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 regulator unit 143 is equal to the voltage at 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 small range, for example, the preset voltage value range is 0.1V-0.3V. Generally, the output voltage of the second buck unit 144 only needs to be slightly lower than the output voltage of the first buck unit 150. By setting the output voltage of the second voltage regulator unit 143 to be equal to the voltage of the first power supply terminal 110, the voltage drop of the second buck unit 144 can be slightly greater than that of the first buck unit 150, reducing the voltage drop difference between the first buck unit 150 and the second buck unit 144. This allows both the first buck unit 150 and the second buck unit 144 to use components with small voltage drop, thereby reducing heat generation and losses in both units and improving the efficiency of the power supply circuit 100. Furthermore, since both the first buck unit 150 and the second buck unit 144 can use components with small voltage drop, the impact on the power supply circuit 100 when either unit fails is relatively small.

[0035] As shown in Figure 5, in some embodiments, the first power supply module 120 further includes a first filter module 124. The first filter module 124 is connected to both the input and output terminals of the first voltage regulator unit 123. The first filter module 124 can filter both the input and output terminals of the first voltage regulator unit 123, thereby enabling the input terminal of the first voltage regulator unit 123 to receive a relatively clean current and the output terminal of the first voltage regulator unit 123 to output a relatively clean current.

[0036] The second power supply module 140 also includes a second filter module 145. The second filter module 145 is connected to both the input and output terminals of the second voltage regulator unit 143. The second filter module 145 can filter both the input and output terminals of the second voltage regulator unit 143, thereby enabling the input terminal of the second voltage regulator unit 143 to receive a relatively clean current and the output terminal of the second voltage regulator unit 143 to output a relatively clean current.

[0037] As shown in Figure 6, in some embodiments, the first step-down unit 150 includes a first diode D1. The anode of the first diode D1 is connected to the first power supply terminal 110, and the cathode is connected to the input terminal of the first voltage regulator unit 123. The first diode D1 can reduce the voltage and prevent voltage backflow at the second output terminal 142 when the first power supply terminal 110 fails, thereby improving the safety of the first power supply terminal 110.

[0038] The second step-down unit 144 includes a second diode D2 and a third diode D3. The anode of the second diode D2 is connected to the output terminal of the second voltage regulator unit 143, the anode of the third diode D3 is connected to the cathode of the second diode D2, and the cathode of the third diode D3 is connected to the cathode of the first diode D1. The second step-down unit 144 includes two diodes, and different voltage reduction amplitudes can be achieved by adjusting the types of the two diodes. Furthermore, the probability of both diodes failing simultaneously is low, thus mitigating risk and reducing the impact on the power supply circuit 100 should the second step-down unit 144 fail.

[0039] 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. For example, the first diode D1 is the same model as the second diode D2, and their voltage drops are the same. The total voltage drop of the second diode D2 and the third diode D3 combined is greater than the voltage drop of the first diode D1. This ensures that the voltage drop of the second buck unit 144 is greater than that of the first buck unit 150. When the output voltage of the second voltage regulator unit 143 is the same as the supply voltage of the first power supply terminal 110, the voltage at the second output terminal 142 is lower than the output voltage of the first buck unit 150. Furthermore, since the first diode D1 and the second diode D2 are the same model, procurement costs can be saved.

[0040] Optionally, the first diode D1, the second diode D2, and the third diode D3 are all of the same type, thereby further saving procurement costs while ensuring that the voltage of the second output terminal 142 is lower than the output voltage of the first step-down unit 150.

[0041] Referring again to Figure 6, in some embodiments, the first voltage regulator unit 123 includes a first linear regulator U1. The first linear 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 a first input terminal 121, the first output pin Vout is a first output terminal 122, and the first ground pin Vss is grounded.

[0042] The second voltage regulator unit 143 includes a second linear regulator U2, which 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.

[0043] Referring again to Figure 6, 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.

[0044] One end of the first capacitor C1 is connected to the input terminal of the first voltage regulator 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 regulator 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 regulator unit 123.

[0045] One end of the third capacitor C3 is connected to the output terminal of the first voltage regulator 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 regulator 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 regulator unit 123.

[0046] 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 regulator 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 regulator unit 143, and the other end is grounded. The fifth capacitor C5 filters the input terminal of the second voltage regulator unit 143, and the sixth capacitor C6 filters the output terminal of the second voltage regulator unit 143.

[0047] Since the first voltage regulator unit 123 is used more frequently than the second voltage regulator unit 143, two sets of capacitors are provided at both the input and output terminals of the first voltage regulator unit 123 to improve the filtering effect. The second voltage regulator unit 143 uses a single set of capacitors at both the input and output terminals to save costs.

[0048] In the accompanying 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 terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only set as exemplary illustrations and should not be construed as limitations on this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0049] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power supply circuit, wherein, The power supply circuit comprises: a first power supply end; a first power supply module having a first input end and a first output end, the first input end being connected with the first power supply end and receiving power supply from the first power supply end, and the first output end being arranged to supply power externally; a second power supply end; and a second power supply module having a second input end and a second output end, the second input end being connected with the second power supply end, and the second output end being connected with the first input end; wherein 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 the second power supply module supplies power to the first power supply module when the first power supply end is abnormal. The power supply circuit further comprises a first voltage reduction unit arranged between the first power supply end and the first input end, and the first power supply module comprises a first voltage stabilizing unit, the input end of the first voltage stabilizing unit being the first input end, and the output end of the first voltage stabilizing unit being the first output end.

2. The power supply circuit of claim 1, wherein, The second power supply module comprises a second voltage stabilizing unit and a second voltage reduction unit, the input end of the second voltage stabilizing unit being the second input end, the output end of the second voltage stabilizing unit being connected with the input end of the second voltage reduction unit, and the output end of the second voltage reduction unit being the second output end.

3. The power supply circuit of claim 2, wherein, The output end of the first voltage reduction unit outputs a first voltage value when the second voltage reduction unit is cut off, the output end of the second voltage reduction unit outputs a second voltage value when the first voltage reduction unit is cut off, 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.

4. The power supply circuit of claim 3, wherein, The first voltage reduction unit comprises a first diode, the anode of the first diode being connected with the first power supply end, and the cathode of the first diode being connected with the input end of the first voltage stabilizing unit.

5. The power supply circuit of claim 4, wherein, The second voltage reduction unit comprises: a second diode, the anode of the second diode being connected with the output end of the second voltage stabilizing unit; and a third diode, the anode of the third diode being connected with the cathode of the second diode, and the cathode of the third diode being connected with the cathode of the first diode. The voltage drop of the first diode is the same as the voltage drop of the second diode, or the voltage drop of the first diode is the same as the voltage drop of the third diode.

6. The power supply circuit of claim 5, wherein, The first voltage stabilizing unit comprises a first linear voltage stabilizer, the first linear voltage stabilizer comprising a first input pin, a first output pin and a first ground pin, the first input pin being the first input end, the first output pin being the first output end, and the first ground pin being grounded.

7. The power supply circuit of claim 3, wherein, The second voltage stabilizing unit comprises a second linear voltage stabilizer, the second linear voltage stabilizer comprising a second input pin, a second output pin and a second ground pin, the second input pin being the second input end, the second output pin being connected with the input end of the second voltage reduction unit, and the second ground pin being grounded. The first power supply module further comprises a first filter module, the first filter module being connected with the input end and the output end of the first voltage stabilizing unit.

8. The power supply circuit of claim 3, wherein, ​ The second power supply module further comprises a second filter module, which is connected with the input end and the output end of the second voltage stabilizing unit.

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

10. A charging device, wherein, comprises: a power supply circuit, which comprises: a first power supply end; a first power supply module, which has a first input end and a first output end, the first input end is connected with the first power supply end and receives power supply of the first power supply end, and the first output end is arranged to supply power externally; a second power supply end; and a second power supply module, which has 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 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 the second power supply module supplies power to the first power supply module when an abnormality occurs in the first power supply end; a first connection terminal, the first power supply end is electrically connected with the first connection terminal; a second connection terminal, the second power supply end is electrically connected with 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; and a control module, which is connected with the first output end, and the first output end supplies power to the control module.

11. The charging apparatus according to claim 10, wherein The power supply circuit further comprises a first voltage reducing unit, which is arranged between the first power supply end and the first input end, the first power supply module comprises 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.

12. The charging apparatus according to claim 11, wherein, The second power supply module comprises a second voltage stabilizing unit and a second voltage reducing 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 with the input end of the second voltage reducing unit, and the output end of the second voltage reducing unit is the second output end.

13. The charging apparatus according to claim 12, wherein, When the second voltage reducing unit is cut off, the output end of the first voltage reducing unit outputs a first voltage value, when the first voltage reducing unit is cut off, the output end of the second voltage reducing 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.

14. The charging apparatus according to claim 13, wherein, The first voltage reduction unit comprises a first diode, a positive electrode of the first diode is connected with the first power supply end, and a negative electrode is connected with an input end of the first voltage stabilizing unit; The second voltage reduction unit comprises: a second diode, a positive electrode of the second diode is connected with an output end of the second voltage stabilizing unit; and a third diode, a positive electrode of the third diode is connected with a negative electrode of the second diode, and a negative electrode is connected with a negative electrode of the first diode.

15. The charging apparatus of claim 14, wherein, The voltage drop of the first diode is the same as the voltage drop of the second diode, or the voltage drop of the first diode is the same as the voltage drop of the third diode.

16. The charging apparatus of claim 12, wherein, The first voltage stabilizing unit comprises a first linear voltage stabilizer, the first linear voltage stabilizer comprises 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 comprises a second linear voltage stabilizer, the second linear voltage stabilizer comprises 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 with an input end of the second voltage reduction unit, and the second ground pin is grounded.

17. The charging apparatus of claim 12, wherein, The first power supply module further comprises a first filter module, the first filter module is connected with the input end and the output end of the first voltage stabilizing unit; The second power supply module further comprises a second filter module, the second filter module is connected with the input end and the output end of the second voltage stabilizing unit.

18. The charging device according to claim 17, wherein, The first filter module comprises: a first capacitor, one end of the first capacitor is connected with 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 with the input end of the first voltage stabilizing unit, and the other end is grounded; a third capacitor, one end of the third capacitor is connected with the output end of the first voltage stabilizing unit, and the other end is grounded; and a fourth capacitor, one end of the third capacitor is connected with the output end of the first voltage stabilizing unit, and the other end is grounded; The second filter module comprises: a fifth capacitor, one end of the fifth capacitor is connected with the input end of the second voltage stabilizing unit, and the other end is grounded; and a sixth capacitor, one end of the sixth capacitor is connected with the output end of the second voltage stabilizing unit, and the other end is grounded.

19. The charging apparatus of claim 10, wherein, The charging device further comprises an output module, the output module is connected with the first connection terminal and the second connection terminal, so as to supply power to the first connection terminal and the second connection terminal.

20. The charging apparatus of claim 10, wherein, The control module is electrically connected with the output module, so as to adjust output parameters of the output module.

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