Voltage output circuit and charging equipment

Abstract

The utility model provides a voltage output circuit and charging equipment. The voltage output circuit comprises a first conversion circuit, a second conversion circuit and a control circuit, wherein the first conversion circuit comprises a power factor correction circuit; the second conversion circuit comprises a transformer and an output sub-circuit, a primary winding of the transformer is connected with the power factor correction circuit, a secondary winding of the transformer is connected with the output sub-circuit, and the output sub-circuit is used for being connected with a load; the control circuit is connected with the power factor correction circuit and the second conversion circuit, and is used for obtaining a feedback signal based on a second output signal of the secondary winding and a third output signal of the output sub-circuit, and adjusting the work of the power factor correction circuit based on the feedback signal and a first output signal of the power factor correction circuit. Therefore, the first output signal is matched with the feedback signal. According to the voltage output circuit provided by the invention, the conversion efficiency of the voltage output circuit can be improved, and the electromagnetic compatibility of the voltage output circuit is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power conversion, and in particular to a voltage output circuit and a charging device. Background Art

[0002] The emergence of fast chargers has adjusted the original fixed single output voltage to multiple wide output voltages, with a large output voltage variation range.

[0003] In the existing power factor correction (PFC) circuit architecture of a fast charger, the PFC circuit outputs a fixed voltage. When the output voltage changes, the conversion efficiency of the fast charger becomes low and the electromagnetic compatibility performance is poor. Utility Model Content

[0004] The present application provides a voltage output circuit and a charging device, which can improve the conversion efficiency of the voltage output circuit and improve the electromagnetic compatibility performance of the voltage output circuit.

[0005] The present application provides a voltage output circuit, which includes a first conversion circuit, a second conversion circuit and a control circuit. The first conversion circuit includes a power factor correction circuit; the second conversion circuit includes a transformer and an output sub-circuit, the primary winding of the transformer is connected to the power factor correction circuit, the secondary winding of the transformer is connected to the output sub-circuit, and the output sub-circuit is used to connect a load; the control circuit is respectively connected to the power factor correction circuit and the second conversion circuit, and is used to obtain a feedback signal based on the second output signal of the secondary winding and the third output signal of the output sub-circuit, and adjust the operation of the power factor correction circuit based on the feedback signal and the first output signal of the power factor correction circuit, so that the first output signal matches the feedback signal.

[0006] Among them, the voltage output circuit also includes a voltage divider circuit, which is respectively connected to the power factor correction circuit, the secondary winding, the output sub-circuit and the control circuit. The control circuit collects the first output signal, the second output signal and the third output signal through the voltage divider circuit.

[0007] Wherein, the transformer also includes a feedback winding, and the control circuit includes a first sub-control circuit and a second sub-control circuit, the first sub-control circuit is respectively connected to the power factor correction circuit, the voltage divider circuit and the feedback winding; the second sub-control circuit is respectively connected to the output sub-circuit and the voltage divider circuit; wherein, the second sub-control circuit obtains a feedback signal based on the second output signal and the third output signal, and feeds it back to the first sub-control circuit through the transformer, and the first sub-control circuit adjusts the operation of the power factor correction circuit based on the comparison result of the feedback signal and the first output signal, so that the first output signal matches the feedback signal.

[0008] Among them, the voltage divider circuit includes a first voltage divider circuit, which is respectively connected to the output sub-circuit and the second sub-control circuit, wherein the second sub-control circuit obtains the second output signal through the first voltage divider circuit, and couples the feedback signal to the first sub-control circuit through the first voltage divider circuit and the transformer.

[0009] Among them, the first voltage divider circuit includes a first resistor, a second resistor, a first capacitor and a second capacitor, one end of the first resistor is connected to one end of the secondary winding, and the other end of the first resistor is connected to the second sub-control circuit; one end of the first capacitor is connected to the other end of the first resistor, and the other end of the first capacitor is grounded; one end of the second resistor is connected to the other end of the secondary winding, and the other end of the second resistor is connected to the second sub-control circuit; one end of the second capacitor is connected to the other end of the second resistor, and the other end of the second capacitor is grounded.

[0010] Among them, the second conversion circuit also includes a first switch tube, a second switch tube and a third capacitor. The control end of the first switch tube is connected to the first sub-control circuit, the first end of the first switch tube is connected to the power factor correction circuit, and the second end of the first switch tube is connected to one end of the primary winding; the control end of the second switch tube is connected to the first sub-control circuit, the first end of the second switch tube is connected to one end of the primary winding, and the second end of the second switch tube is grounded; one end of the third capacitor is connected to the other end of the primary winding, and the other end of the third capacitor is grounded.

[0011] The output sub-circuit includes a rectifier circuit and an energy storage capacitor. The rectifier circuit is connected to the secondary winding and the second sub-control circuit respectively; the energy storage capacitor is connected to the rectifier circuit.

[0012] The voltage output circuit further includes a second voltage divider circuit, and the second voltage divider circuit is connected to the feedback winding and the first sub-control circuit respectively.

[0013] The present application provides a charging device, which includes the above-mentioned voltage output circuit.

[0014] Among them, the charging device includes a charger.

[0015] The beneficial effects of the present application are as follows: the voltage output circuit of the present embodiment includes a first conversion circuit, a second conversion circuit and a control circuit, the first conversion circuit includes a power factor correction circuit; the second conversion circuit includes a transformer and an output subcircuit, the primary winding of the transformer is connected to the power factor correction circuit, the secondary winding of the transformer is connected to the output subcircuit, and the output subcircuit is used to connect the load; the control circuit is connected to the power factor correction circuit and the second conversion circuit respectively, and is used to obtain a feedback signal based on the second output signal of the secondary winding and the third output signal of the output subcircuit, and adjust the operation of the power factor correction circuit based on the feedback signal and the first output signal of the power factor correction circuit, so that the first output signal matches the feedback signal. Through the above method, the control circuit obtains the feedback signal based on the second output signal and the third output signal, so that the control circuit can obtain the accurate change value of the output signal of the second conversion circuit, that is, the accurate change value of the output signal of the second conversion circuit is obtained by double sampling, and the control circuit adjusts the operation of the power factor correction circuit based on the feedback signal and the first output signal, which can improve the adjustment accuracy of the power factor correction circuit, so that the first output signal and the feedback signal match, thereby improving the conversion efficiency of the voltage output circuit, and maintaining the conversion efficiency of the voltage output circuit in a better state. In addition, since the first output signal matches the feedback signal, that is, the first output signal matches the second output signal, the primary winding voltage does not change, thereby improving the problem of poor electromagnetic compatibility caused by changes in the secondary winding output voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0017] Figure 1 is a structural schematic diagram of an embodiment of a voltage output circuit provided by the present application;

[0018] Figure 2 is a structural schematic diagram of another embodiment of the voltage output circuit provided by the present application;

[0019] Figure 3 is a circuit diagram of an embodiment of a voltage output circuit provided by the present application;

[0020] Figure 4 It is a structural schematic diagram of an embodiment of a charging device provided in this application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0024] The present application provides a voltage output circuit, referring to Figure 1 , Figure 1 is a schematic diagram of the structure of an embodiment of a voltage output circuit provided by the present application, such as Figure 1 As shown, the voltage output circuit 10 includes a control circuit 130 and a first conversion circuit 110 and a second conversion circuit 120 respectively connected to the control circuit 130. Specifically, the first conversion circuit 110 includes a power factor correction circuit 111, the second conversion circuit 120 includes a transformer U1 and an output subcircuit 121, the primary winding of the transformer U1 is connected to the power factor correction circuit 111, the secondary winding of the transformer U1 is connected to the output subcircuit 121, and the control circuit 130 is respectively connected to the power factor correction circuit 111 and the second conversion circuit 120. Among them, the control circuit 130 is used to obtain a feedback signal based on the second output signal output by the secondary winding of the transformer U1 and the third output signal output by the output subcircuit 121, and adjust the operation of the power factor correction circuit 111 based on the feedback signal and the first output signal of the power factor correction circuit 111, so that the first output signal matches the feedback signal.

[0025] Among them, the first conversion circuit 110 of the present application is used to convert the connected external AC voltage signal into a first DC voltage signal, and the second conversion circuit 120 is used to convert the first DC voltage signal into a second DC voltage signal. It can be known that the control circuit adjusts the operation of the power factor correction circuit 111, that is, controls the opening and closing of the switch tube of the power factor correction circuit 111. Specifically, the peak value of the first output signal of the power factor correction circuit 111 is changed by changing the duration of the opening and closing of the switch tube. Among them, the first DC voltage signal is the first output signal. The second conversion circuit 120 converts the input first DC voltage signal, that is, the first output signal, into the second output signal through the transformer U1. It can be understood that the second output signal of the present application is an AC voltage signal. The output subcircuit 121 outputs a third output signal, that is, a second DC voltage signal, and provides electrical energy to the load.

[0026] The control circuit 130 obtains a feedback signal based on the second output signal and the third output signal, so that the control circuit 130 can obtain the precise change value of the output signal of the second conversion circuit 120. The control circuit 130 then adjusts the operation of the power factor correction circuit 111 based on the first output signal and the feedback signal, so that the first output signal output by the power factor correction circuit 111 matches the feedback signal. Among them, the feedback signal can be a voltage change value and / or a specific change signal, or a trend of voltage change. Among them, the matching of the first output signal and the feedback signal can be understood as that the first output signal increases when the feedback signal increases, and the first output signal decreases when the feedback signal decreases. Specifically, the voltage difference between the first output signal and the feedback signal is maintained within a preset difference range, so that the optimal voltage difference is maintained between the first output signal and the feedback signal, so that the conversion efficiency of the voltage output circuit 10 is maintained in an optimal state.

[0027] The voltage output circuit 10 of this embodiment includes a first conversion circuit 110, a second conversion circuit 120 and a control circuit 130. The first conversion circuit 110 includes a power factor correction circuit 111; the second conversion circuit 120 includes a transformer U1 and an output sub-circuit 121, the primary winding of the transformer U1 is connected to the power factor correction circuit 111, the secondary winding of the transformer U1 is connected to the output sub-circuit 121, and the output sub-circuit 121 is used to connect a load; the control circuit 130 is respectively connected to the power factor correction circuit 111 and the second conversion circuit 120, and is used to obtain a feedback signal based on the second output signal of the secondary winding and the third output signal of the output sub-circuit 121, and adjust the operation of the power factor correction circuit 111 based on the feedback signal and the first output signal of the power factor correction circuit 111, so that the first output signal matches the feedback signal. Through the above method, the control circuit 130 obtains the feedback signal based on the second output signal and the third output signal, so that the control circuit 130 can obtain the accurate change value of the output signal of the second conversion circuit, that is, obtain the accurate change value of the output signal of the second conversion circuit 120 through double sampling. The control circuit 130 then adjusts the operation of the power factor correction circuit 111 based on the feedback signal and the first output signal, which can improve the adjustment accuracy of the power factor correction circuit 111, so that the first output signal and the feedback signal match, thereby improving the conversion efficiency of the voltage output circuit 10, and maintaining the conversion efficiency of the voltage output circuit 10 in a better state. In addition, since the first output signal and the feedback signal match, that is, the first output signal and the second output signal match, the primary winding voltage does not change, thereby improving the problem of poor electromagnetic compatibility caused by the change of the secondary winding output voltage.

[0028] Specifically, the control circuit 130 determines the specific changed signal and the changed value based on the second output signal and the third output signal, so as to obtain an accurate changed value, i.e., a feedback signal, by double sampling. The control circuit 130 then compares the feedback signal with the first output signal to obtain a more accurate difference, such as a more accurate voltage difference. The control circuit 130 adjusts the on and off time of the switch tube of the power factor correction circuit according to the changed voltage difference and the changed signal, so that the first output signal matches the feedback signal, so that the conversion efficiency of the voltage output circuit 10 is maintained in a better state, and at the same time, the problem of poor electromagnetic compatibility caused by the change in the output voltage of the secondary winding is improved. For example, the second output signal is an AC signal, and the third output signal is a DC signal. Based on the two signals, the specific changed signal and the changed value can be known.

[0029] See also Figure 2 , Figure 2 is a schematic diagram of the structure of another embodiment of the voltage output circuit provided by the present application, such as Figure 2As shown, the voltage output circuit 10 also includes a voltage divider circuit 140, which is respectively connected to the power factor correction circuit 111, the secondary winding, the output sub-circuit 121 and the control circuit 130. The control circuit 130 collects the first output signal, the second output signal and the third output signal through the voltage divider circuit 140.

[0030] Optionally, the transformer U1 also includes a feedback winding, and the control circuit 130 includes a first sub-control circuit 131 and a second sub-control circuit 132, the first sub-control circuit 131 is respectively connected to the power factor correction circuit 111, the voltage divider circuit 140 and the feedback winding; the second sub-control circuit 132 is respectively connected to the output sub-circuit 121 and the voltage divider circuit 140; wherein the second sub-control circuit 132 obtains a feedback signal based on the second output signal and the third output signal, and feeds it back to the first sub-control circuit 131 through the transformer U1, and the first sub-control circuit 131 adjusts the operation of the power factor correction circuit 111 based on the comparison result of the feedback signal and the first output signal.

[0031] It can be understood that the control circuit 130 sets a second sub-control circuit 132 in the secondary winding of the transformer U1, and sets a first sub-control circuit 131 in the primary winding of the transformer U1. After the second sub-control circuit 132 generates a feedback signal, the feedback signal is fed back to the first sub-control circuit 131 through the transformer U1, so that the first sub-control circuit 131 adjusts the operation of the power factor correction circuit 111 based on the comparison result of the feedback signal and the first output signal, so that the first output signal matches the feedback signal.

[0032] Optionally, the voltage divider circuit 140 includes a first voltage divider circuit, which is connected to the output sub-circuit 121 and the second sub-control circuit 132 respectively, wherein the second sub-control circuit 132 obtains the second output signal through the first voltage divider circuit, and couples the feedback signal to the first sub-control circuit 131 through the first voltage divider circuit and the transformer U1. It can be understood that the second sub-control circuit 132 collects the second output signal through the first voltage divider circuit during the second output signal collection period, the second sub-control circuit 132 obtains the feedback signal based on the second output signal and the third output signal, and sends the feedback signal to the secondary winding through the first voltage divider circuit during the second output signal non-collection period, so that the secondary winding couples the feedback signal to the feedback winding, thereby coupling the feedback signal to the first sub-control circuit 131.

[0033] The voltage divider circuit 140 of this embodiment includes a first voltage divider circuit, which is connected to the output sub-circuit 121 and the second sub-control circuit 132 respectively, wherein the second sub-control circuit 132 obtains the second output signal through the first voltage divider circuit, and couples the feedback signal to the first sub-control circuit 131 through the first voltage divider circuit and the transformer U1. In the above manner, the second sub-control circuit 132 of this embodiment can collect the second output signal through the first voltage divider circuit, and the first voltage divider circuit can couple the feedback signal to the first sub-control circuit 131 in cooperation with the transformer U1, so that the first voltage divider circuit and the transformer U1 have a multiplexing function, reduce the setting of independent feedback circuits, and can reduce the cost of the voltage output circuit 10.

[0034] Specifically, see Figure 3 , Figure 3 is a circuit diagram of an embodiment of a voltage output circuit provided by the present application, such as Figure 3 As shown, the first voltage divider circuit of this embodiment includes a first resistor R1, a first capacitor C1, a second resistor R2 and a second capacitor C2. Among them, one end of the first resistor R1 is connected to one end of the secondary winding, and the other end of the first resistor R1 is connected to the second sub-control circuit 132; one end of the first capacitor C1 is connected to the other end of the first resistor R1, and the other end of the first capacitor C1 is grounded. One end of the second resistor R2 is connected to the other end of the secondary winding, and the other end of the second resistor R2 is connected to the second sub-control circuit 132; one end of the second capacitor C2 is connected to the other end of the second resistor R2, and the other end of the second capacitor C2 is grounded.

[0035] Optionally, continue to Figure 3 The voltage divider circuit also includes a second voltage divider circuit, which is respectively connected to the feedback winding and the first sub-control circuit 131. The secondary winding couples the feedback signal to the feedback winding, and the first sub-control circuit 131 collects the feedback signal through the second voltage divider circuit. The first sub-control circuit 131 adjusts the operation of the power factor correction circuit 111 based on the collected feedback signal and the first output signal, so that the first output signal matches the feedback signal.

[0036] Specifically, the second voltage divider circuit includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected to one end of the feedback winding, the other end of the third resistor R3 is respectively connected to the first sub-control circuit 131 and one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded.

[0037] Optionally, the second conversion circuit 120 of this embodiment further includes a first switch tube Q1, a second switch tube Q2 and a third capacitor C3, the control end of the first switch tube Q1 is connected to the first sub-control circuit 131, the first end of the first switch tube Q1 is connected to the power factor correction circuit 111, and the second end of the first switch tube Q1 is connected to one end of the primary winding; the control end of the second switch tube Q2 is connected to the first sub-control circuit 131, the first end of the second switch tube Q2 is connected to one end of the primary winding and the second end of the first switch tube Q1, and the second end of the second switch tube Q2 is grounded; one end of the third capacitor C3 is connected to the other end of the primary winding, and the other end of the third capacitor C3 is connected to the second end of the second switch tube Q2. It can be understood that the first switch tube Q1 and the second switch tube Q2 constitute an inverter circuit, and the first sub-control circuit 131 controls the first switch tube Q1 and the second switch tube Q2 to work, converting the first output signal output by the power factor correction circuit 111 into an AC signal, and the AC signal outputs the second output signal after passing through the transformer U1. It can be known that the second output signal is an AC signal. When the second output signal and / or the third output signal changes, the first sub-control circuit 131 adjusts the operation of the power factor correction circuit so that the first output signal matches the feedback signal, which can be regarded as the first output signal matching the second output signal. At this time, the voltage across the primary winding of the transformer U1 remains unchanged, which can improve the problem of poor electromagnetic compatibility performance caused by the voltage change across the primary winding.

[0038] Optionally, the voltage divider circuit further includes a third voltage divider circuit, which is respectively connected to the power factor correction circuit 111 and the first sub-control circuit 131, and the first sub-control circuit 131 collects the first output signal through the third voltage divider circuit. Specifically, the third voltage divider circuit includes a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 is respectively connected to the first end of the first switch tube Q1 and the power factor correction circuit 111, the other end of the fifth resistor R5 is respectively connected to the first sub-control circuit 131 and one end of the sixth resistor R6, and the other end of the sixth resistor R6 is grounded.

[0039] Optionally, continue to Figure 3, the output sub-circuit 121 includes a rectifier circuit, an energy storage capacitor C4, a seventh resistor R7 and a fifth capacitor C5. Among them, the rectifier circuit is also connected to the secondary winding and the second sub-control circuit 132 respectively. Specifically, the rectifier circuit includes a fourth switch tube Q4 and a fifth switch tube Q5, a first end of the fourth switch tube Q4 is connected to one end of the secondary winding, a second end of the fourth switch tube Q4 is connected to the negative input end of the energy storage capacitor C4, and a control end of the fourth switch tube Q4 is connected to the second sub-control circuit 132; a first end of the fifth switch tube Q5 is connected to the other end of the secondary winding, a second end of the fifth switch tube Q5 is connected to the positive input end of the energy storage capacitor C4, and a control end of the fifth switch tube Q5 is connected to the second sub-control circuit 132. One end of the seventh resistor R7 is connected to the positive input end of the energy storage capacitor C4 and the second sub-control circuit 132, the other end of the seventh resistor R7 is connected to one end of the fifth capacitor C5, and the other end of the fifth capacitor C5 is grounded. It can be understood that the second sub-control circuit 132 controls the control end of the rectifier circuit (i.e., the control end of the fourth switch tube and the fifth switch tube) to control the rectifier circuit to rectify the second output signal, and the rectified second output signal can supply power to the load and charge the energy storage capacitor C4. Among them, the third output signal output by the output sub-circuit 121 can come from the rectified second output signal output by the rectifier circuit and / or the DC signal output by the energy storage capacitor C4. Among them, the second sub-control circuit 132 collects the third output signal through the seventh resistor R7.

[0040] Continue reading Figure 3 The first conversion circuit 110 also includes a second rectifier circuit and a filter circuit composed of four diodes, and the filter circuit is connected to the second rectifier circuit and the power factor correction circuit 111 respectively. The second rectifier circuit receives an external AC signal and rectifies the external AC signal to output a DC signal, the filter circuit filters the DC signal output by the second rectifier circuit, and the power factor correction circuit 111 converts the filtered DC signal and outputs a first output signal to the storage device of the first conversion circuit and the second conversion circuit 120.

[0041] This application provides a charging device, see Figure 4 , Figure 4 is a schematic diagram of the structure of an embodiment of a charging device provided by the present application, such as Figure 4 As shown, the charging device 20 includes a voltage output circuit 21, wherein the voltage output circuit 21 includes the voltage output circuit of any embodiment of the above-mentioned voltage output circuit.

[0042] Optionally, the charging device 20 includes a charger compliant with a fast protocol, and the fast charger can output a third output signal of 3.3V to 48V.

[0043] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0044] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A voltage output circuit, characterized in that: include: A first conversion circuit including a power factor correction circuit; A second conversion circuit includes a transformer and an output subcircuit, wherein the primary winding of the transformer is connected to the power factor correction circuit, the secondary winding of the transformer is connected to the output subcircuit, and the output subcircuit is used to connect to a load; A control circuit is connected to the power factor correction circuit and the second conversion circuit, respectively, and is used to obtain a feedback signal based on the second output signal of the secondary winding and the third output signal of the output sub-circuit, and adjust the operation of the power factor correction circuit based on the feedback signal and the first output signal of the power factor correction circuit so that the first output signal matches the feedback signal.

2. The voltage output circuit according to claim 1, characterized in that: The voltage output circuit further includes: The voltage divider circuit is respectively connected to the power factor correction circuit, the secondary winding, the output subcircuit and the control circuit, and the control circuit collects the first output signal, the second output signal and the third output signal through the voltage divider circuit.

3. The voltage output circuit according to claim 2, characterized in that: The transformer further includes a feedback winding, and the control circuit includes: A first sub-control circuit is connected to the power factor correction circuit, the voltage divider circuit and the feedback winding respectively; A second sub-control circuit is connected to the output sub-circuit and the voltage divider circuit respectively; Among them, the second sub-control circuit obtains a feedback signal based on the second output signal and the third output signal, and feeds it back to the first sub-control circuit through the transformer, and the first sub-control circuit adjusts the operation of the power factor correction circuit based on the comparison result of the feedback signal and the first output signal so that the first output signal matches the feedback signal.

4. The voltage output circuit according to claim 3, characterized in that: The voltage divider circuit comprises: The first voltage divider circuit is connected to the output sub-circuit and the second sub-control circuit respectively, wherein the second sub-control circuit obtains the second output signal through the first voltage divider circuit, and couples the feedback signal to the first sub-control circuit through the first voltage divider circuit and the transformer.

5. The voltage output circuit according to claim 4, characterized in that: The first voltage divider circuit comprises: a first resistor, one end of the first resistor being connected to one end of the secondary winding, and the other end of the first resistor being connected to the second sub-control circuit; A first capacitor, one end of the first capacitor is connected to the other end of the first resistor, and the other end of the first capacitor is grounded; a second resistor, one end of the second resistor being connected to the other end of the secondary winding, and the other end of the second resistor being connected to the second sub-control circuit; A second capacitor, one end of the second capacitor is connected to the other end of the second resistor, and the other end of the second capacitor is grounded.

6. The voltage output circuit according to claim 3, characterized in that: The second conversion circuit further includes: a first switch tube, wherein a control end of the first switch tube is connected to the first sub-control circuit, a first end of the first switch tube is connected to the power factor correction circuit, and a second end of the first switch tube is connected to one end of the primary winding; a second switch tube, wherein a control end of the second switch tube is connected to the first sub-control circuit, a first end of the second switch tube is connected to one end of the primary winding, and a second end of the second switch tube is grounded; A third capacitor, one end of the third capacitor is connected to the other end of the primary winding, and the other end of the third capacitor is grounded.

7. The voltage output circuit according to claim 6, characterized in that: The output subcircuit comprises: a rectifier circuit, connected to the secondary winding and the second sub-control circuit respectively; The energy storage capacitor is connected to the rectifier circuit and the voltage divider circuit.

8. The voltage output circuit according to claim 4, characterized in that: The voltage divider circuit further includes: The second voltage divider circuit is connected to the feedback winding and the first sub-control circuit respectively.

9. A charging device, characterized in that: include: The voltage output circuit according to any one of claims 1 to 8.

10. The charging device according to claim 9, characterized in that: The charging device includes a fast charger.

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