Power supply device

Abstract

This disclosure discloses a power supply device in which a first auxiliary circuit provides a constant voltage to the control circuit when the DC input voltage is less than a first preset value, and a second auxiliary circuit provides an output voltage to the control circuit when the DC input voltage is greater than a second preset value. That is, the power supply device uses different auxiliary circuits to supply power when the DC input voltage is in different voltage ranges. The power supply device uses two auxiliary circuits to distribute voltage conversion, and is not limited to using a single auxiliary circuit to convert a wide range of voltages. Therefore, the loss of the auxiliary circuits is low, resulting in lower overall power supply device losses.

Description

Technical Field

[0001] This disclosure relates to a power supply device, and more particularly to a power supply device comprising two auxiliary circuits. Background Technology

[0002] Currently, fast charging protocols for consumer electronics require a significant increase in the range of output voltage and output power provided by power supplies for charging these devices. However, for power supplies with a wide output voltage range, when the output voltage needs to vary considerably, the single auxiliary circuit within the power supply provides significant power to the control circuit, resulting in substantial losses and overall power supply losses.

[0003] Therefore, how to develop a power supply device to solve the problems faced by existing technologies is an urgent issue that needs to be addressed in this field. Summary of the Invention

[0004] The purpose of this disclosure is to provide a power supply device that, when the DC input voltage is less than a first preset value, provides a constant voltage to the control circuit via a first auxiliary circuit, and when the DC input voltage is greater than a second preset value, provides an output voltage to the control circuit via a second auxiliary circuit. In other words, the power supply device of this disclosure uses different auxiliary circuits to provide auxiliary power when the DC input voltage is in different voltage ranges. The power supply device of this disclosure utilizes two auxiliary circuits for voltage conversion and distribution, and is not limited to using a single auxiliary circuit to convert a wide range of voltages. Therefore, the losses of the auxiliary circuits in the power supply device of this disclosure are lower, resulting in lower overall power supply device losses.

[0005] To achieve the above objectives, a preferred embodiment of this disclosure provides a power supply device comprising a primary circuit, a secondary circuit, a first auxiliary circuit, a control circuit, and a second auxiliary circuit. The primary circuit receives a DC input voltage and includes a primary winding. The secondary winding is coupled to the primary winding. A first rectifier is connected in series with the secondary winding to form a first series branch, which provides the output voltage. The first auxiliary circuit includes a first auxiliary winding, a second rectifier, a first capacitor, and a first voltage regulation circuit. The first auxiliary winding is coupled to both the secondary and primary windings. A second rectifier is connected in series with the first auxiliary winding to form a second series branch. The first capacitor is electrically connected in parallel with the second series branch, and the voltage across the first capacitor is proportional to the output voltage. The first voltage regulation circuit includes an input terminal and an output terminal. The first capacitor is connected across the input terminal of the first voltage regulation circuit, and when current flows through the first voltage regulation circuit, the output terminal of the first voltage regulation circuit provides a first constant voltage. The second auxiliary circuit includes a second auxiliary winding and a voltage multiplier circuit. The second auxiliary winding is coupled to both the secondary and primary windings. The voltage multiplier circuit includes an input terminal and an output terminal. The input terminal of the voltage multiplier circuit is electrically coupled to the second auxiliary winding. The output terminal of the voltage multiplier circuit is connected to the output terminal of the first voltage adjustment circuit and then to the control circuit. The output voltage of the voltage multiplier circuit is proportional to the DC input voltage. When the DC input voltage is less than a first preset value, the first auxiliary circuit supplies power to the control circuit. When the DC input voltage is greater than a second preset value, the second auxiliary circuit supplies power to the control circuit. The first preset value is less than or equal to the second preset value. Attached Figure Description

[0006] Figure 1 This is a circuit topology diagram of a power supply device according to a first embodiment of the present disclosure.

[0007] Figure 2 This is a circuit topology diagram of a power supply device according to a second embodiment of the present disclosure.

[0008] Figure 3 This is a circuit topology diagram of a power supply device according to a third embodiment of the present disclosure.

[0009] Figure 4 for Figure 1 The diagram shows the detailed circuit structure of the second rectifier device in the power supply unit.

[0010] Figure 5 for Figure 1 A detailed circuit diagram of the first voltage regulation circuit of the first embodiment of the power supply device shown.

[0011] Figure 6 for Figure 1 A detailed circuit diagram of the first voltage regulation circuit of the second embodiment of the power supply device shown.

[0012] Figure 7 for Figure 1 A detailed circuit diagram of the voltage doubler circuit of the first embodiment of the power supply device shown.

[0013] Figure 8 for Figure 1 A detailed circuit diagram of the voltage doubler circuit in the second embodiment of the power supply device shown.

[0014] Figure 9 for Figure 1 A detailed circuit diagram of another embodiment of the second auxiliary circuit of the power supply device shown.

[0015] [List of Labels in the Attached Image]

[0016] 1, 1a, 1b: Power supply device

[0017] Vin+: Input positive terminal

[0018] Vin-: Input negative terminal

[0019] Vo+: Positive output terminal

[0020] Vo-: Negative output terminal

[0021] Vcc+: Auxiliary output positive terminal

[0022] Vcc-: Auxiliary output negative terminal

[0023] 2: Primary circuit

[0024] Cin: Input capacitance

[0025] 21: Switch bridge arm

[0026] Q1: Switch on

[0027] Q2: Down switch

[0028] 22: Primary winding

[0029] 221: First End

[0030] 222: Second end

[0031] C1: Second capacitor

[0032] A: Main connection point

[0033] L1: First Inductor

[0034] 3: Secondary circuit

[0035] 31: Secondary winding

[0036] 311: First end

[0037] 312: Second end

[0038] 32: First rectifier device

[0039] Co: Output capacitor

[0040] 4: First Auxiliary Circuit

[0041] 41: First auxiliary winding

[0042] 411: First end

[0043] 412: Second end

[0044] 42: Second rectifier device

[0045] D1: Diode

[0046] C2: First capacitor

[0047] 43, 43a: First voltage adjustment circuit

[0048] M: Adjustment switch

[0049] 441: First end

[0050] 442: Second end

[0051] 443: Third end

[0052] ZD1: Zener diode

[0053] R: Adjusting the resistor

[0054] C7: Adjust capacitor

[0055] 5: Second auxiliary circuit

[0056] 51: Second auxiliary winding

[0057] 511: First end

[0058] 512: Second end

[0059] 52, 52a: Voltage multiplier circuit

[0060] C3: First voltage multiplier capacitor

[0061] D2: First voltage multiplier diode

[0062] D3: Second voltage multiplier diode

[0063] C4: Second voltage multiplier capacitor

[0064] C5: Third voltage multiplier capacitor

[0065] C6: Fourth voltage multiplier capacitor

[0066] D4: Third voltage multiplier diode

[0067] D5: Fourth voltage multiplier diode

[0068] B: First voltage multiplier node

[0069] C: Second voltage multiplier node

[0070] 53: Second voltage adjustment circuit

[0071] 6: Control circuit Detailed Implementation

[0072] Some typical embodiments embodying the features and advantages of this disclosure will be described in detail in the following description. It should be understood that this disclosure can be varied in different implementations without departing from the scope of this disclosure, and the descriptions and drawings therein are for illustrative purposes only and not for limiting the scope of this disclosure.

[0073] Please see Figure 1 This is a circuit topology diagram of a power supply device according to the first embodiment of this disclosure. As shown in the figure, the power supply device 1 includes an input positive terminal Vin+, an input negative terminal Vin-, an output positive terminal Vo+, an output negative terminal Vo-, an auxiliary output positive terminal Vcc+, an auxiliary output negative terminal Vcc-, a primary circuit 2, a secondary circuit 3, a first auxiliary circuit 4, a second auxiliary circuit 5, and a control circuit 6. The power supply device 1 receives a DC input voltage provided by an external power source via the input positive terminal Vin+ and the input negative terminal Vin-, provides an output voltage to a load (not shown) via the output positive terminal Vo+ and the output negative terminal Vo-, and outputs a constant voltage to the control circuit 6 via the auxiliary output positive terminal Vcc+ and the auxiliary output negative terminal Vcc-.

[0074] The primary circuit 2 includes an input capacitor Cin, a switch bridge arm 21, a primary winding 22, and a second capacitor C1. The input capacitor Cin is connected between the positive input terminal Vin+ and the negative input terminal Vin-. The switch bridge arm 21 includes an upper switch Q1 and a lower switch Q2, which are connected in series between the positive input terminal Vin+ and the negative input terminal Vin-, and are connected in parallel with the input capacitor Cin. The connection point between the upper switch Q1 and the lower switch Q2 forms the main connection point A. The switch bridge arm 21 receives the DC input voltage provided by an external power source through the positive input terminal Vin+ and the negative input terminal Vin-. The switch bridge arm 21 is also connected in parallel with the input capacitor. The primary winding 22 includes a first terminal 221 and a second terminal 222. The second capacitor C1 is connected in series with the primary winding 22 to form a third series branch, which is electrically coupled to the two ends of the lower switch Q2. The first end 221 of the primary winding 22 is electrically coupled to the main connection point A, and the positions of capacitor C1 and primary winding 22 can be interchanged.

[0075] The secondary circuit 3 includes a secondary winding 31, a first rectifier 32, and an output capacitor Co. The secondary winding 31 is coupled to the primary winding 22 and includes a first terminal 311 and a second terminal 312. The second terminal 312 of the secondary winding 31 is electrically coupled to the output negative terminal Vo-. The first rectifier 32 can be a diode or a MOSFET, including but not limited to GANS MOSFETs and SiC MOSFETs. The first rectifier 32 and the secondary winding 31 are connected in series to form a first series branch, wherein the first series branch provides an output voltage to the load via the output positive terminal Vo+ and the output negative terminal Vo-. In this embodiment, the first rectifier 32 is connected between the second terminal 312 of the secondary winding 31 and the output negative terminal Vo-. In other embodiments, the first rectifier can also be connected between the first terminal 311 of the secondary winding 31 and the output positive terminal Vo+. The output capacitor Co is electrically coupled between the output positive terminal Vo+ and the output negative terminal Vo-, and is connected in parallel with the first series branch.

[0076] The first auxiliary circuit 4 includes a first auxiliary winding 41, a second rectifier 42, a first capacitor C2, and a first voltage adjustment circuit 43. The first auxiliary winding 41 is coupled to the secondary winding 31 and the primary winding 22, and includes a first terminal 411 and a second terminal 412. The second rectifier 42 is connected in series with the first auxiliary winding 41 to form a second series branch. The first capacitor C2 is connected in parallel with the second series branch. The voltage across the first capacitor C2 is proportional to the output voltage. The first voltage adjustment circuit 43 includes an input positive terminal, an input negative terminal, an output positive terminal, and an output negative terminal. The input positive terminal and the input negative terminal together constitute the input terminal of the first voltage adjustment circuit 43, and the output positive terminal and the output negative terminal together constitute the output terminal of the first voltage adjustment circuit 43. The first capacitor C2 is connected across the input positive terminal and the input negative terminal of the first voltage adjustment circuit 43. The output positive terminal and the output negative terminal of the first voltage adjustment circuit 43 are electrically coupled to the input terminal of the control circuit 6. In this embodiment, the first end 221 of the primary winding 22, the second end 312 of the secondary winding 31, and the second end 412 of the first auxiliary winding 41 are terminals with the same name. When the DC input voltage provided by the external power supply is less than a first preset value, the control circuit 6 is powered by the first auxiliary circuit 4. In this embodiment, the first end 411 of the first auxiliary winding 41 is connected to the second rectifier 42. In other embodiments, the second end 412 of the first auxiliary winding is connected to the second rectifier.

[0077] The second auxiliary circuit 5 includes a second auxiliary winding 51 and a voltage multiplier circuit 52. The second auxiliary winding 51 is coupled to the secondary winding 31 and the primary winding 22, and includes a first terminal 511 and a second terminal 512. The voltage multiplier circuit 52 includes a first input terminal, a second input terminal, a positive output terminal, and a negative output terminal. The first input terminal and the second input terminal together constitute the input terminal of the voltage multiplier circuit 52, and the positive output terminal and the negative output terminal together constitute the output terminal of the voltage multiplier circuit 52. The first input terminal of the voltage multiplier circuit 52 is electrically coupled to the first terminal 511 of the second auxiliary winding 51, and the second input terminal of the voltage multiplier circuit 52 is electrically coupled to the second terminal 512 of the second auxiliary winding 51. The output terminal of the voltage multiplier circuit 52 is connected to the output terminal of the first voltage adjustment circuit 43 and is connected to the control circuit 6. The positive output terminal of the voltage multiplier circuit 52 is electrically coupled to the positive output terminal of the first voltage adjustment circuit 43, and the negative output terminal of the voltage multiplier circuit 52 is electrically coupled to the negative output terminal of the first voltage adjustment circuit 43. When the DC input voltage provided by the external power supply is greater than the second preset value, the second auxiliary circuit 5 supplies power to the control circuit 6. The conversion method will be described in detail below.

[0078] When the DC input voltage provided by the external power supply is less than a first preset value, a current flows through the first voltage adjustment circuit 43, and the output of the first voltage adjustment circuit 43 provides a first constant voltage to the control circuit 6. The voltage across capacitor C2 is proportional to the output voltage provided by the secondary circuit 3. When the DC input voltage provided by the external power supply is greater than a second preset value, the voltage multiplier circuit 52 provides voltage to the control circuit 6. The output voltage provided by the voltage multiplier circuit 52 is proportional to the DC input voltage received by the primary circuit 2. In this embodiment, the first preset value is less than or equal to the second preset value.

[0079] As can be seen from the above, when the DC input voltage is less than a first preset value, the power supply device 1 of this disclosure provides a constant voltage to the control circuit through the first auxiliary circuit 4, and when the DC input voltage is greater than a second preset value, the second auxiliary circuit 5 provides an output voltage to the control circuit. This means that the power supply device 1 of this disclosure uses different auxiliary circuits to supply power when the DC input voltage is in different voltage ranges. Compared to traditional power supplies that use a single auxiliary circuit for auxiliary power supply, the power supply device 1 of this disclosure utilizes two auxiliary circuits for voltage conversion and distribution, and is not limited to using a single auxiliary circuit to convert a wide range of voltages. Therefore, the losses of the auxiliary circuits in the power supply device 1 of this disclosure are lower, resulting in lower overall power supply device 1 losses.

[0080] Please see Figure 2 This is a circuit topology diagram of a power supply device according to a second embodiment of the present disclosure. The primary circuit 2 of the power supply device 1a in this embodiment further includes a first inductor L1, which is connected in series with a second capacitor C1.

[0081] In some embodiments, the location of the third series branch of the primary circuit 2 is not limited to being electrically coupled to both ends of the lower switch Q2, such as... Figure 3 As shown, where Figure 3 This is a circuit topology diagram of a power supply device according to a third embodiment of this disclosure. Figure 3 As shown, in this embodiment, the third series branch formed by the second capacitor C1 and the primary winding 22 of the power supply device 1b is electrically coupled to both ends of the upper switch Q1. The second end 222 of the primary winding 22 is electrically coupled to the main connection point A, and the positions of the capacitor C1 and the primary winding 22 can be interchanged.

[0082] Please see Figure 4 , it is Figure 1 The diagram shows a detailed circuit structure of the second rectifier device in the power supply unit. The second rectifier device 42 is a diode D1. Alternatively, the second rectifier device could be a MOSFET. Of course, Figure 4 The diode shown can also be used in Figure 2 Power supply device 1a and Figure 3 In the second rectifier device 42 of the power supply device 1b.

[0083] Please see Figure 5 , it is Figure 1 The diagram shows a detailed circuit structure of the first voltage adjustment circuit of the first embodiment of the power supply device. The first voltage adjustment circuit 43 includes an adjustment switch M, a Zener diode ZD1, an adjustment resistor R, and an adjustment capacitor C7. The adjustment switch M includes a first terminal 441, a second terminal 442, and a third terminal 443. The first terminal 441 of the adjustment switch M is electrically coupled to the positive input terminal of the first voltage adjustment circuit 43, and the third terminal 443 of the adjustment switch M is electrically coupled to the positive output terminal of the first voltage adjustment circuit 43, and further electrically coupled to the control circuit 6. The cathode of the Zener diode ZD1 is electrically coupled to the second terminal 442 of the adjustment switch M, and the anode of the Zener diode ZD1 is electrically coupled to the negative input terminal of the first voltage adjustment circuit 43. The adjustment resistor R is electrically coupled between the second terminal 442 and the third terminal 443 of the adjustment switch M. The two terminals of the adjustment capacitor C7 are electrically coupled to the positive and negative output terminals of the first voltage adjustment circuit 43, respectively, and further electrically coupled to the control circuit 6. Figure 5 The adjustment switch can be a depletion-type MOSFET. In some embodiments, the adjustment switch can be an enhancement-type MOSFET, such as... Figure 6 As shown, where Figure 6 for Figure 1 The diagram shows a detailed circuit structure of the first voltage adjustment circuit in the second embodiment of the power supply device. In this embodiment, the adjustment resistor R is electrically coupled between the first terminal 441 and the second terminal 442 of the adjustment switch M. Figure 6 The adjustment switch in the middle can also be a transistor. Of course, Figure 5 and Figure 6 The detailed circuitry of the first voltage regulation circuit can also be applied to Figure 2 Power supply device 1a and Figure 3 In the first voltage adjustment circuit of the power supply device 1b.

[0084] Please see Figure 7 , it is Figure 1 The diagram shows a detailed circuit structure of the voltage multiplier circuit in the first embodiment of the power supply device. The voltage multiplier circuit 52 includes a first voltage multiplier capacitor C3, a first voltage multiplier diode D2, a second voltage multiplier diode D3, and a second voltage multiplier capacitor C4. The first terminal of the first voltage multiplier capacitor C3 is electrically coupled to the first input terminal of the voltage multiplier circuit 52, and further electrically coupled to the first terminal 511 of the second auxiliary winding 51. The cathode of the first voltage multiplier diode D2 is electrically coupled to the second terminal of the first voltage multiplier capacitor C3 and the anode of the second voltage multiplier diode D3. The anode of the first voltage multiplier diode D2 is electrically coupled to the second input terminal of the voltage multiplier circuit 52, and further electrically coupled to the second terminal 512 of the second auxiliary winding 51. The cathode of the second voltage multiplier diode D3 is electrically coupled to the positive output terminal of the voltage multiplier circuit 52, and further electrically coupled to the control circuit 6. The two terminals of the second voltage multiplier capacitor C4 are electrically coupled to the positive and negative output terminals of the voltage multiplier circuit 52, and further electrically coupled to the control circuit 6.

[0085] Please see Figure 8 , it is Figure 1 The diagram shows a detailed circuit structure of the voltage multiplier circuit in the second embodiment of the power supply device. The voltage multiplier circuit 52a includes a third voltage multiplier capacitor C5, a fourth voltage multiplier capacitor C6, a third voltage multiplier diode D4, and a fourth voltage multiplier diode D5. The third voltage multiplier capacitor C5 and the fourth voltage multiplier capacitor C6 are connected in series to form a first voltage multiplier branch. This first voltage multiplier branch is electrically coupled between the positive and negative output terminals of the voltage multiplier circuit 52a, and further electrically coupled to the control circuit 6. The connection point between the third voltage multiplier capacitor C5 and the fourth voltage multiplier capacitor C6 forms a first voltage multiplier node B. This first voltage multiplier node B is electrically coupled to the second input terminal of the voltage multiplier circuit 52a, and further electrically coupled to the second terminal 512 of the second auxiliary winding 51. The anode of the third voltage multiplier diode D4 and the cathode of the fourth voltage multiplier diode D5 are connected to form the second voltage multiplier branch. The cathode of the third voltage multiplier diode D4 in the second voltage multiplier branch is electrically coupled to the positive output of the voltage multiplier circuit 52a, and then electrically coupled to the control circuit 6. The anode of the fourth voltage multiplier diode D5 in the second voltage multiplier branch is electrically coupled to the negative output of the voltage multiplier circuit 52a, and then electrically coupled to the control circuit 6. The connection point between the third voltage multiplier diode D4 and the fourth voltage multiplier diode D5 forms the second voltage multiplier node C. The second voltage multiplier node C is electrically coupled to the first input terminal of the voltage multiplier circuit 52a, and then electrically coupled to the first terminal 511 of the second auxiliary winding 51.

[0086] In some embodiments, the second auxiliary circuit may further include a second voltage adjustment circuit, such as... Figure 9 As shown, it is Figure 1 A detailed circuit diagram of another embodiment of the second auxiliary circuit of the power supply device is shown. The voltage multiplier circuit 52 is connected to the control circuit 6 via the second adjustment circuit 53. When current flows through the second voltage adjustment circuit 53, the second voltage adjustment circuit 53 outputs a second constant voltage, wherein the detailed circuit structure of the second voltage adjustment circuit 53 is similar to... Figure 5 The first voltage adjustment circuit 43 shown or Figure 6 The detailed circuit structures of the first voltage adjustment circuit 43a and the voltage multiplier circuit 52 shown can be similar to those of the following: Figure 5 The voltage multiplier circuit 52 shown is or Figure 6 The voltage multiplier circuit 52a shown here will not be described in detail here.

[0087] In summary, when the DC input voltage is less than a first preset value, the power supply device of this disclosure provides a constant voltage to the control circuit via a first auxiliary circuit, and when the DC input voltage is greater than a second preset value, the output voltage is provided to the control circuit via a second auxiliary circuit. This means that the power supply device of this disclosure uses different auxiliary circuits to supply power when the DC input voltage is in different voltage ranges, utilizing two auxiliary circuits for voltage conversion and distribution. It is not limited to using a single auxiliary circuit to convert a wide range of voltages. Therefore, the losses of the auxiliary circuits in the power supply device of this disclosure are lower, resulting in lower overall power supply device losses.

Claims

1. A power supply device, comprising: A primary-side circuit that receives a DC input voltage, the primary-side circuit including a primary-side winding; and A side circuit, including: A secondary winding, coupled to the primary winding; and A first rectifier device is connected in series with the secondary winding to form a first series branch, which is used to provide an output voltage; A first auxiliary circuit, comprising: A first auxiliary winding is coupled to both the secondary winding and the primary winding. A second rectifier device is connected in series with the first auxiliary winding to form a second series branch; A first capacitor is electrically connected in parallel with the second series branch, and the voltage across the first capacitor is proportional to the output voltage; and A first voltage adjustment circuit includes an input terminal and an output terminal. A first capacitor is connected across the input terminal of the first voltage adjustment circuit. When current flows through the first voltage adjustment circuit, the output terminal of the first voltage adjustment circuit provides a first constant voltage. A control circuit; and A second auxiliary circuit, comprising: A second auxiliary winding, coupled to both the secondary winding and the primary winding; and A voltage multiplier circuit includes an input terminal and an output terminal. The input terminal of the voltage multiplier circuit is electrically coupled to the second auxiliary winding. The output terminal of the voltage multiplier circuit is connected to the output terminal of the first voltage adjustment circuit and connected to the control circuit. The output voltage of the voltage multiplier circuit is proportional to the DC input voltage. When the DC input voltage is less than a first preset value, the first auxiliary circuit supplies power to the control circuit; when the DC input voltage is greater than a second preset value, the second auxiliary circuit supplies power to the control circuit. The first preset value is less than or equal to the second preset value.

2. The power supply device as claimed in claim 1, wherein the primary-side circuit further comprises: A switch bridge arm, comprising an upper switch and a lower switch, the upper switch and the lower switch being connected in series to form a main connection point, the switch bridge arm being used to receive the DC input voltage; and A first capacitor is connected in series with the primary winding to form a third series branch, which is electrically coupled to the two ends of the upper switch or the lower switch.

3. The power supply device as claimed in claim 1, wherein the primary-side circuit further includes a first inductor and a second capacitor, the first inductor and the second capacitor being connected in series.

4. The power supply device as claimed in claim 1, wherein the first voltage adjustment circuit includes an adjustment switch, a Zener diode, an adjustment resistor, and an adjustment capacitor; the adjustment switch includes a first terminal, a second terminal, and a third terminal; the first terminal of the adjustment switch is electrically coupled to a positive input terminal of the input terminal of the first voltage adjustment circuit; the third terminal of the adjustment switch is electrically coupled to a positive output terminal of the output terminal of the first voltage adjustment circuit; the cathode of the Zener diode is electrically coupled to the second terminal of the adjustment switch; the anode of the Zener diode is electrically coupled to a negative input terminal of the input terminal of the first voltage adjustment circuit; the adjustment resistor is electrically coupled between the second terminal and the third terminal of the adjustment switch; and the two ends of the adjustment capacitor are electrically coupled to the positive output terminal and the negative output terminal of the output terminal of the first voltage adjustment circuit.

5. The power supply device as claimed in claim 1, wherein the first voltage adjustment circuit includes an adjustment switch, a Zener diode, an adjustment resistor, and an adjustment capacitor; the adjustment switch includes a first terminal, a second terminal, and a third terminal; the first terminal of the adjustment switch is electrically coupled to a positive input terminal of the input terminal of the first voltage adjustment circuit; the third terminal of the adjustment switch is electrically coupled to a positive output terminal of the output terminal of the first voltage adjustment circuit; the cathode of the Zener diode is electrically coupled to the second terminal of the adjustment switch; the anode of the Zener diode is electrically coupled to a negative input terminal of the input terminal of the first voltage adjustment circuit; the adjustment resistor is electrically coupled between the first terminal and the second terminal of the adjustment switch; and the two ends of the adjustment capacitor are electrically coupled to the positive output terminal and the negative output terminal of the output terminal of the first voltage adjustment circuit.

6. The power supply device as claimed in claim 1, wherein the voltage multiplier circuit includes a first voltage multiplier capacitor, a first voltage multiplier diode, a second voltage multiplier diode, and a second voltage multiplier capacitor; a first terminal of the first voltage multiplier capacitor is electrically coupled to a first input terminal of the input terminal of the voltage multiplier circuit; the cathode of the first voltage multiplier diode is electrically coupled to a second terminal of the first voltage multiplier capacitor and the anode of the second voltage multiplier diode; the anode of the first voltage multiplier diode is electrically coupled to a second input terminal of the input terminal of the voltage multiplier circuit; the cathode of the second voltage multiplier diode is electrically coupled to a positive output terminal of the output terminal of the voltage multiplier circuit; and the two ends of the second voltage multiplier capacitor are respectively electrically coupled to the positive output terminal and a negative output terminal of the output terminal of the voltage multiplier circuit.

7. The power supply device as claimed in claim 1, wherein the voltage multiplier circuit includes a third voltage multiplier capacitor, a fourth voltage multiplier capacitor, a third voltage multiplier diode, and a fourth voltage multiplier diode; the third voltage multiplier capacitor and the fourth voltage multiplier capacitor are connected in series to form a first voltage multiplier branch; the first voltage multiplier branch is electrically coupled between a positive output terminal and a negative output terminal of the output terminal of the voltage multiplier circuit; the connection point between the third voltage multiplier capacitor and the fourth voltage multiplier capacitor forms a first voltage multiplier node; the first voltage multiplier node is electrically coupled to a first input terminal of the input terminal of the voltage multiplier circuit; the third voltage multiplier diode and the fourth voltage multiplier diode are connected in series to form a second voltage multiplier branch; the second voltage multiplier branch is electrically coupled between the positive output terminal and the negative output terminal of the output terminal of the voltage multiplier circuit; the connection point between the third voltage multiplier diode and the fourth voltage multiplier diode forms a second voltage multiplier node; the second voltage multiplier node is electrically coupled to a second input terminal of the input terminal of the voltage multiplier circuit.

8. The power supply device as claimed in claim 1, wherein the second auxiliary circuit further includes a second voltage adjustment circuit, the voltage multiplier circuit is connected to the control circuit via the second voltage adjustment circuit, and when current flows through the second voltage adjustment circuit, the second voltage adjustment circuit outputs a second constant voltage.

9. The power supply device of claim 1, wherein the primary-side circuit includes an input capacitor and a switching bridge arm, the input capacitor and the switching bridge arm being connected in parallel.

10. The power supply device of claim 1, wherein the secondary circuit includes an output capacitor connected in parallel with the first series branch.

11. The power supply device of claim 1, wherein the second rectifier is a diode.

12. The power supply device as claimed in claim 1, wherein the secondary winding and the first auxiliary winding each include a first end and a second end, the second end of the secondary winding is connected to the first rectifier, the first end of the first auxiliary winding is connected to the second rectifier, and the second end of the secondary winding and the second end of the first auxiliary winding are terminals with the same name.

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