Power supply device and its operating method

Abstract

The present invention provides a power supply device and a method for operating the same. [Solution] A power supply device comprising: a power conversion circuit that receives an input voltage; an output control circuit; a current detection circuit; a first feedback circuit that receives a first detected voltage signal and a first detected current signal and generates a first control signal accordingly; a coupling circuit that generates a power conversion control signal based on the first control signal; and a power conversion control circuit that generates a conversion signal based on the power conversion control signal, wherein the output control circuit sets a first control signal and generates a first output voltage accordingly when the control terminal is coupled to a first control voltage, and sets a first control signal and generates a second output voltage accordingly when the control terminal is coupled to a second control voltage.

Description

[Technical Field]

[0001] This disclosure relates to a power supply device, and more particularly to a power supply device in which the output voltage can be set. [Background technology]

[0002] Currently, various power specifications of light-emitting diode (LED) fixtures are commercially available, such as LED lights connected in series and / or parallel in an appropriate configuration. Furthermore, LED fixtures themselves also come in various power specifications, such as LED fixtures with a 12V input voltage and LED fixtures with a 24V input voltage. To accommodate LED fixtures with different power specifications, power supply manufacturers must produce different types of power supply units, which not only increases the complexity of material preparation and manufacturing but also creates inventory management problems. Moreover, there is a risk that fixture manufacturers may damage LED fixtures by misusing power supply units with inappropriate specifications. [Overview of the project] [Means for solving the problem]

[0003] Therefore, in order to solve the above technical problems, an effective design form for a power supply device is desired. One aspect of the present disclosure is a power supply device for supplying power to a load, comprising: a power conversion circuit including a first input terminal and a second input terminal for receiving an input voltage, a first output terminal and a second output terminal for coupling to the load; an output control circuit coupled to the first output terminal and having a control terminal; a current detection circuit including a first terminal coupled to the second output terminal of the power conversion circuit and a second terminal for coupling to the load; a first feedback circuit coupled to the first output terminal of the power conversion circuit to receive a first detection voltage signal, coupled to the current detection circuit to receive a first detection current signal, and coupled to the output control circuit to generate a corresponding first control signal; a coupling circuit coupled to the first feedback circuit to receive the first control signal and to generate a power conversion control signal based on the first control signal; and a coupling circuit coupled to the coupling circuit and the power conversion circuit and for the power conversion control signal. The power supply device comprises a power conversion control circuit that generates a conversion signal based on the above, wherein when the control terminal of the output control circuit is coupled to a first control voltage, the output control circuit is configured such that the first feedback circuit generates the first control signal, and in response to the first control signal, the power conversion circuit generates a corresponding first output voltage and limits the output current to a first maximum output current, and when the control terminal of the output control circuit is coupled to a second control voltage, the output control circuit is configured such that the first feedback circuit generates the first control signal, and in response to the first control signal, the power conversion circuit generates a corresponding second output voltage and limits the output current to a second maximum output current, and the first control voltage is greater than the second control voltage, the first output voltage is greater than the second output voltage, and the first maximum output current is less than the second maximum output current.

[0004] Another aspect of the present disclosure relates to a method for operating a power supply device for supplying power to a load, wherein the power supply device comprises: a power conversion circuit including a first input terminal and a second input terminal, a first output terminal and a second output terminal for coupling to the load; an output control circuit coupled to the first output terminal and having a control terminal; a current detection circuit including a first terminal coupled to the second output terminal of the power conversion circuit and a second terminal for coupling to the load; a first feedback circuit coupled to the first output terminal of the power conversion circuit, the current detection circuit and the output control circuit; a coupling circuit coupled to the first feedback circuit; and a power conversion control circuit coupled to the coupling circuit and the power conversion circuit, wherein the method for operating the power supply device comprises: setting the first input terminal and the second input terminal of the power conversion circuit to receive an input voltage, and supplying power to the load at the first output terminal and the second output terminal of the power conversion circuit; setting the first feedback circuit to receive a first detection voltage signal from the first output terminal of the power conversion circuit and a first detection current signal from the current detection circuit, and correspondingly generating a first control signal; and the coupling circuit The power supply device is configured such that a path receives the first control signal from the first feedback circuit and generates a power conversion control signal based on the first control signal, and the power conversion control circuit is configured to generate a conversion signal based on the power conversion control signal, wherein when the control terminal of the output control circuit is coupled to a first control voltage, the output control circuit is configured such that the first feedback circuit generates the first control signal, and in accordance with the first control signal, the power conversion circuit generates a first output voltage and limits the output current to a first maximum output current, and when the control terminal of the output control circuit is coupled to a second control voltage, the output control circuit is configured such that the first feedback circuit generates the first control signal, and in accordance with the first control signal, the power conversion circuit generates a second output voltage and limits the output current to a second maximum output current, and the first control voltage is greater than the second control voltage, the first output voltage is greater than the second output voltage, and the first maximum output current is less than the second maximum output current. [Effects of the Invention]

[0005] The power supply device provided in this disclosure can achieve various power output specifications. [Brief explanation of the drawing]

[0006] You can gain a better understanding of this disclosure by referring to the attached drawings below and reviewing the detailed description of the embodiments below. [Figure 1] This is a block diagram of one embodiment of the power supply device according to the present disclosure. [Figure 2A] Figure 1 is a block diagram of a portion of the circuitry of the power supply device. [Figure 2B] Figure 2A is a diagram showing the specific circuit architecture of the power supply device. [Figure 3] This is a block diagram of another embodiment of the power supply device according to the present disclosure. [Figure 4A] Figure 3 is a partial circuit diagram of the power supply device. [Figure 4B] Figure 4A is a diagram showing the specific circuit architecture of the power supply device. [Modes for carrying out the invention]

[0007] The following will be a detailed explanation in accordance with the examples and attached drawings. The specific examples described are not intended to limit the present application, but merely to allow interpretation. The descriptions of structural operations are not used to restrict the order of their execution, and any structure recombined by the elements, or any apparatus having a uniform effect, is included within the scope of this disclosure.

[0008] Throughout this document, unless otherwise specified, terms used in the specification and claims generally have their ordinary meanings as used in this art and in the context of this disclosure.

[0009] As used in this text, "coupling" refers to two or more elements making direct physical or electrical contact with each other, or making indirect physical or electrical contact with each other, or to two or more elements operating or acting upon each other.

[0010] Please refer to Figure 1, a block diagram of one embodiment of the power supply device 100 according to this disclosure. The power supply device 100 is for supplying power to a load (light-emitting diode 200). The power supply device 100 is coupled to the anode LED (+) and cathode LED (-) of the light-emitting diode 200 and supplies power to the light-emitting diode 200. The power supply device 100 comprises a power conversion circuit 102, an output control circuit 108, a first feedback circuit 110, a coupling circuit 111, and a power conversion control circuit 112. In one embodiment, one or more light-emitting elements such as LEDs may be used as the light-emitting diode 200, and an appropriate power conversion structure such as an isolated or non-isolated DC to DC converter, a switch-mode power supply (SMPS), or an AC to DC converter may be used as the power conversion circuit 102, and the first feedback circuit 110 may include elements such as digital circuits, analog circuits, optocouplers, and / or optical isolators so that it can transmit a feedback signal to the power conversion control circuit 112 and be configured so that the power conversion control circuit 112 generates an appropriate output voltage Vout and / or output current Iout for the power conversion circuit 102.

[0011] In the following embodiment, the output voltage Vout of the power supply device 100 is controlled to 12V or 24V by controlling the signal level of the control terminal CW of the output control circuit 108, and power is supplied to the light-emitting diode 200 with a voltage of 12V or a voltage of 24V accordingly. In other embodiments, the output voltage Vout of the power supply device 100 can also be set to one of two or more other suitable voltages by controlling the signal level of the control terminal CW of the output control circuit 108.

[0012] In this embodiment, the power conversion circuit 102 may be configured to have two types of power output specifications, 12V and 24V. When the control terminal CW is coupled to a first control voltage (for example, a high voltage), the output control circuit 108 and the first feedback circuit 110 generate a first control signal CS1 based on the first control voltage, a first detection voltage signal V1a, and a first detection current signal V1b and transmit it to the coupling circuit 111. The coupling circuit 111 generates a power conversion control signal CS based on the first control signal CS1 and transmits it to the power conversion control circuit 112. The power conversion control circuit 112 generates a conversion signal Sc based on the power conversion control signal CS and transmits it to the power conversion circuit 102. As a result, the power conversion circuit 102 performs a power conversion operation on the power input signal (i.e., input voltage Vin) based on the conversion signal Sc, so that the output voltage Vout is set to 24V.

[0013] If the control terminal CW is not coupled to the first control voltage (for example, floating, grounded, or at an appropriate voltage level such as a second control voltage lower than the first control voltage), the output control circuit 108 and the first feedback circuit 110 generate a first control signal CS1 based on the first detected voltage signal V1a and the first detected current signal V1b and transmit it to the coupling circuit 111. The coupling circuit 111 generates a power conversion control signal CS based on the first control signal CS1 and transmits it to the power conversion control circuit 112. The power conversion control circuit 112 generates a conversion signal Sc based on the power conversion control signal CS and transmits it to the power conversion circuit 102, so that the power conversion circuit 102 performs a power conversion operation on the input voltage Vin based on the conversion signal Sc and sets the output voltage Vout to 12V.

[0014] The power conversion circuit 102 includes a first input terminal 102a and a second input terminal 102b for receiving the input voltage Vin, a first output terminal 102c, and a second output terminal 102d. The first output terminal 102c and the second output terminal 102d are used to connect to the light-emitting diode 200 and output a first voltage V1 to the light-emitting diode 200. The first output terminal 102c is used to connect to the anode LED (+) of the light-emitting diode 200. The input voltage Vin may be an AC voltage or a DC voltage.

[0015] In one embodiment, the power supply device 100 further includes a power factor correction (PFC) circuit 114 and a first capacitor C1. The power factor correction circuit 114 includes a first AC input terminal 114a and a second AC input terminal 114b that receive the raw voltage I / P and generate an input voltage Vin to the first input terminal 102a and the second input terminal 102b, and a first power factor correction output terminal 114c and a second power factor correction output terminal 114d that are respectively coupled to the first input terminal 102a and the second input terminal 102b. The first capacitor C1 has a first end coupled to the first power factor correction output terminal 114c and the first input terminal 102a, and a second end coupled to the second power factor correction output terminal 114d and the second input terminal 102b. Therefore, due to the above circuit structure, the power conversion circuit 102 receives the input voltage Vin. In one embodiment, an AC voltage may be employed as the raw voltage I / P.

[0016] In one embodiment, the power supply device 100 does not include the power factor correction circuit 114 and the first capacitor C1, and the first input terminal 102a and the second input terminal 102b of the power conversion circuit 102 directly receive the raw voltage I / P.

[0017] In this embodiment, the power supply device 100 further includes a current detection circuit 104 that is coupled to the second output terminal 102d and the cathode LED(−) of the light-emitting diode 200, and is coupled to the first output terminal 102c and the anode LED(+) of the light-emitting diode 200 via a second capacitor C2. The current detection circuit 104 includes a first shunt resistor Ra having a first end coupled to the second output terminal 102d and a second end coupled to the cathode LED(−) of the light-emitting diode 200. Since the voltage drop across both ends of the first shunt resistor Ra and the current flowing through the first shunt resistor Ra have a positive correlation, the voltage value of the first shunt resistor Ra can be used as the first detected current signal V1b to detect the current value flowing through the current detection circuit 104.

[0018] The output control circuit 108 is coupled to the first output terminal 102c and the first feedback circuit 110. In one embodiment, if it is desired to generate an output voltage Vout of 24V in the power supply device 100 by coupling the control terminal CW of the output control circuit 108 to the first control voltage, the control terminal CW can be coupled to the first output terminal 102c to activate the output control circuit 108. If it is desired to generate an output voltage Vout of 12V in the power supply device 100 without coupling the control terminal CW of the output control circuit 108 to the first control voltage, the control terminal CW is made floating, grounded, or coupled to an appropriate voltage level such as a second control voltage smaller than the first control voltage to deactivate the output control circuit 108.

[0019] The first feedback circuit 110 is coupled to the first output terminal 102c such that the first terminal receives the first detected voltage signal V1a, coupled to the first shunt resistor Ra of the current detection circuit 104 such that the second terminal receives the first detected current signal V1b, and also coupled to the output control circuit 108. The first feedback circuit 110 correspondingly generates a first control signal CS1 based on the first detected voltage signal V1a and the first detected current signal V1b and based on the operating state of the first feedback circuit 110.

[0020] In this embodiment, the power supply device 100 further includes a second capacitor C2 so as to provide a function of stabilizing the output voltage Vout. Both ends of the second capacitor C2 are respectively coupled to the anode LED(+) and the cathode LED(−) of the light emitting diode 200.

[0021] The coupling circuit 111 is coupled to the first feedback circuit 110 to receive the first control signal CS1 and is used to generate a power conversion control signal CS based on the first control signal CS1.

[0022] The power conversion control circuit 112 receives the power conversion control signal CS generated by the first feedback circuit 110 and generates a conversion signal Sc based on the power conversion control signal CS.

[0023] As shown in Figure 1, the power conversion circuit 102 is coupled to the power conversion control circuit 112 and converts the input voltage Vin to an output voltage Vout at an appropriate voltage level based on the conversion signal Sc generated by the power conversion control circuit 112.

[0024] Please refer to Figure 2A, which is a block diagram of some of the circuits of the power supply device 100 shown in Figure 1. For ease of explanation, only the power conversion circuit 102, output control circuit 108, first feedback circuit 110, and power conversion control circuit 112 are shown in Figure 2A.

[0025] As shown in the embodiment of Figure 2A, the output control circuit 108 includes a control terminal CW, a pin detection circuit 108a, and an adjustment control generation circuit 108b. The pin detection circuit 108a sets the operating state of the adjustment control generation circuit 108b correspondingly based on the voltage of the control terminal CW. The pin detection circuit 108a is set so that the adjustment control generation circuit 108b operates when the control terminal CW is coupled to a first control voltage (e.g., a high voltage), but so that the adjustment control generation circuit 108b does not operate when the control terminal CW is not coupled to the first control voltage (e.g., floating, grounded, or at an appropriate voltage level such as a second control voltage smaller than the first control voltage).

[0026] As shown in the embodiment of Figure 2A, the first feedback circuit 110 includes a first voltage divider circuit 110a, a first current feedback reference setting circuit 110b, a first comparator circuit 110c, and a second comparator circuit 110d. The first voltage divider circuit 110a and the first comparator circuit 110c provide voltage feedback control functionality, while the first current feedback reference setting circuit 110b and the second comparator circuit 110d provide current feedback control functionality. The first voltage divider circuit 110a is coupled to a first output terminal 102c to receive a first detection voltage signal V1a and is also coupled to an adjustment control generation circuit 108b. When the adjustment control generation circuit 108b is not operating, it generates a first divided detection voltage signal VP11 having a first level based on the first detection voltage signal V1a. When the adjustment control generation circuit 108b is operating, it generates the first divided detection voltage signal VP11 having a second level based on the first detection voltage signal V1a. In one embodiment, the output voltage Vout corresponding to the power conversion circuit 102 of the first divided detection voltage signal VP11 at the first level is 12V, and the output voltage Vout corresponding to the power conversion circuit 102 of the second divided detection voltage signal VP11 at the second level is 24V.

[0027] In one embodiment, the power supply device 100 may be configured to provide two types of power specifications: an output voltage of 12V and a maximum output current of 5A (maximum output power of 60W), and an output voltage of 24V and a maximum output current of 2.5A (maximum output power of 60W). The first current feedback reference setting circuit 110b is coupled to the adjustment control generation circuit 108b. When the adjustment control generation circuit 108b is not operating, the maximum output current Iout corresponding to the power conversion circuit 102 of the third-level first current feedback reference signal VP12 generated by the first current feedback reference setting circuit 110b is 5A. When the adjustment control generation circuit 108b is operating, the maximum output current Iout corresponding to the power conversion circuit 102 of the fourth-level first current feedback reference signal VP12 generated by the first current feedback reference setting circuit 110b is 2.5A.

[0028] The first comparison circuit 110c is coupled to the first voltage divider circuit 110a and used to compare the first divided detection voltage signal VP11 with the reference voltage signal Vref in order to generate a first voltage control signal S11 having either a fifth level or a sixth level. In one embodiment, the output voltage Vout corresponding to the power conversion circuit 102 of the fifth level first voltage control signal S11 is 12V, and the output voltage Vout corresponding to the power conversion circuit 102 of the sixth level first voltage control signal S11 is 24V.

[0029] The second comparison circuit 110d is coupled to the first current feedback reference setting circuit 110b and is used to compare the first current feedback reference signal VP12 and the first detected current signal V1b in order to generate a first current control signal S12 having either a seventh level or an eighth level, respectively. In one embodiment, the maximum output current Iout corresponding to the power conversion circuit 102 of the seventh level first current control signal S12 is 5A, and the maximum output current Iout corresponding to the power conversion circuit 102 of the eighth level first current control signal S12 is 2.5A. In this embodiment, the first control signal CS1 consists of a first voltage control signal S11 and a first current control signal S12.

[0030] The above levels 1 through 8 may be set at the same or different signal levels.

[0031] The coupling circuit 111 is coupled to the first comparator circuit 110c and the second comparator circuit 110d, and generates a corresponding power conversion control signal CS based on the first control signal CS1.

[0032] Please refer to Figure 2B, which is a specific circuit architecture diagram of the power supply device 100 shown in Figure 2A. As shown in the embodiment in Figure 2B, the pin detection circuit 108a includes a first switch Q1, a second switch Q2, a first diode D1, a third capacitor C11, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The adjustment control generation circuit 108b includes a third switch Q3, a fourth switch Q4, a seventh resistor R7, and an eighth resistor R8. In one embodiment, the first switch Q1, the third switch Q3, and the fourth switch Q4 may be N-type metal-oxide-semiconductor field-effect transistors (N-channel MOSFETs), the second switch Q2 may be a PNP bipolar junction transistor (BJT), and the first diode D1 may be a Zener diode.

[0033] The first diode D1, first resistor R1, second resistor R2, and third capacitor C11 are used to convert the voltage at the control terminal CW to an appropriate voltage level to turn the first switch Q1 and the second switch Q2 on or off. The cathode LED (-) of the first diode D1 is coupled to the control terminal CW. The first terminal of the first resistor R1 is coupled to the anode LED (+) of the first diode D1. The first terminal of the second resistor R2 is coupled to the second terminal of the first resistor R1, but the second terminal is grounded. The first terminal of the third capacitor C11 is coupled to the second terminal of the first resistor R1, the first terminal of the second resistor R2, and the gate g1 of the first switch Q1, but the second terminal is grounded. The source s1 of the first switch Q1 is grounded. The first terminal of the third resistor R3 is coupled to the first output terminal 102c of the power conversion circuit 102 to receive the first voltage V1. The fourth resistor R4 has its first terminal connected to the second terminal of the third resistor R3, and its second terminal connected to the drain d1 of the first switch Q1. The second switch Q2 has its base B connected to the second terminal of the third resistor R3 and the first terminal of the fourth resistor R4, and its emitter E connected to the first output terminal 102c of the power conversion circuit 102 to receive the first voltage V1. The fifth resistor R5 has its first terminal connected to the collector C of the second switch Q2. The sixth resistor R6 has its first terminal connected to the second terminal of the fifth resistor R5, and its second terminal is grounded.

[0034] The gate g3 of the third switch Q3 is connected to the second terminal of the fifth resistor R5 and the first terminal of the sixth resistor R6, but its source s3 is grounded. The first terminal of the seventh resistor R7 is connected to the first feedback circuit 110, but its second terminal is connected to the drain d3 of the third switch Q3. The gate g4 of the fourth switch Q4 is connected to the gate g3 of the third switch Q3, the second terminal of the fifth resistor R5 and the first terminal of the sixth resistor R6, but its source s4 is grounded. The first terminal of the eighth resistor R8 is connected to the first feedback circuit 110, but its second terminal is connected to the drain d4 of the fourth switch Q4.

[0035] When the control terminal CW is coupled to the first control voltage, the first switch Q1 and the second switch Q2 of the pin detection circuit 108a are turned on, which in turn turns on the third switch Q3 and the fourth switch Q4 of the adjustment control generation circuit 108b. When the control terminal CW is not coupled to the first control voltage (for example, floating, grounded, or at an appropriate voltage level such as a second control voltage lower than the first control voltage), the first switch Q1 and the second switch Q2 of the pin detection circuit 108a are turned off, which in turn turns off the third switch Q3 and the fourth switch Q4 of the adjustment control generation circuit 108b.

[0036] As shown in the embodiment of Figure 2B, the first voltage divider circuit 110a includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13. The first current feedback reference setting circuit 110b includes a fifth capacitor C13 and a sixteenth resistor R16. The first comparator circuit 110c includes a second diode D2, a fourteenth resistor R14, a fifteenth resistor R15, a fourth capacitor C12, and a first operational amplifier OP1. The second comparator circuit 110d includes a third diode D3, a seventeenth resistor R17, an eighteenth resistor R18, a sixth capacitor C14, and a second operational amplifier OP2. The coupling circuit 111 may transmit the first control signal CS1 of the first feedback circuit 110 to the power conversion control circuit 112 by employing an appropriate signal transmission method such as an electrical signal, an optical signal, or a magnetic signal. In one embodiment, the coupling circuit 111 includes a photodiode coupled to a first comparator circuit 110c and a second comparator circuit 110d to convert a first control signal CS1 into an optical signal, and a photodetector that receives the optical signal, converts it into a power conversion control signal CS, and transmits it to a power conversion control circuit 112.

[0037] The first terminal of the ninth resistor R9 receives the first detection voltage signal V1a. The first terminal of the tenth resistor R10 is connected to the second terminal of the ninth resistor R9 so as to receive the reference voltage signal Vref. The first terminal of the eleventh resistor R11 is connected to the second terminal of the tenth resistor R10, but its second terminal is grounded. The first terminal of the twelfth resistor R12 receives the first detection voltage signal V1a. The first terminal of the thirteenth resistor R13 is connected to the second terminal of the twelfth resistor R12, but its second terminal is grounded. The first operational amplifier OP1 is coupled to the second terminal of the ninth resistor R9 and the first terminal of the tenth resistor R10 so that its non-reverse-phase input terminal (+) receives the reference voltage signal Vref, while its reverse-phase input terminal (-) is coupled to the second terminal of the twelfth resistor R12 and the first terminal of the thirteenth resistor R13. Its positive power terminal Vs+ is coupled to the first output terminal 102c of the power conversion circuit 102, while its negative power terminal Vs- is grounded. The first terminal of the fourteenth resistor R14 is coupled to the reverse-phase input terminal (-) of the first operational amplifier OP1. The fourth capacitor C12 is coupled to the second terminal of the fourteenth resistor R14, while its second terminal is coupled to the first amplified output terminal V of the first operational amplifier OP1. o1 The 15th resistor R15 has its first end connected to the second end of the 4th capacitor C12 and the first amplification output terminal V of the 1st operational amplifier OP1. o1 The second diode D2 has its first terminal connected to the second terminal of the 15th resistor R15. The 16th resistor R16 has its first terminal connected to the second terminal of the 10th resistor R10 and the first terminal of the 11th resistor R11. The 5th capacitor C13 has its first terminal connected to the second terminal of the 16th resistor R16, but its second terminal is grounded. The second operational amplifier OP2 has its non-reverse-phase input terminal (+) connected to the second terminal of the 16th resistor R16 and the first terminal of the 5th capacitor C13, but its reverse-phase input terminal (-) receives the first detection current signal V1b, its positive power terminal Vs+ is connected to the first output terminal 102c of the power conversion circuit 102, but its negative power terminal Vs- is grounded. The 17th resistor R17 has its first terminal connected to the reverse-phase input terminal (-) of the second operational amplifier OP2. The sixth capacitor C14 has its first end connected to the second end of the seventeenth resistor R17, but its second end is connected to the second amplification output terminal V of the second operational amplifier OP2. o2 The 18th resistor R18 has its first end connected to the second end of the 6th capacitor C14 and the second amplification output terminal V of the 2nd operational amplifier OP2. o2The third diode D3 has its first end connected to the second end of the 18th resistor R18, but its second end is connected to the second end of the second diode D2.

[0038] In one embodiment, the reference voltage signal Vref may be a reference voltage signal generated by a constant voltage source, such as a voltage of 2.5V. The reference voltage signal Vref is divided by the voltage division of the 10th resistor R10 and the 11th resistor R11, so that the voltage is A first reference voltage divider signal Vref1, which is JPEG2026079711000002.jpg50151, is generated.

[0039] The power conversion control circuit 112 is coupled to the coupling circuit 111 so that its first terminal receives the power conversion control signal CS, generates a conversion signal Sc based on the power conversion control signal CS, and controls the power conversion circuit 102 to generate a desired output voltage Vout.

[0040] As shown in the embodiment of Figure 2B, the power conversion circuit 102 includes a switch-mode power converter 102X, a first winding N1, and a second winding N2. In one embodiment, the first winding N1 is the primary side winding or primary coil, while the second winding N2 is the secondary side winding or secondary coil.

[0041] The switch-mode power converter 102X has a first and second terminal (i.e., a first input terminal 102a and a second input terminal 102b) that receive the input voltage Vin. The switch-mode power converter 102X has a third and fourth terminal that are coupled to the first and second terminals of the first winding N1. The first terminal of the second winding N2 (i.e., the first output terminal 102c) is used to couple to the anode LED (+) of the light-emitting diode 200. The second terminal of the second winding N2 (i.e., the second output terminal 102d) is used to couple to the cathode LED (-) of the light-emitting diode 200.

[0042] Therefore, if the control terminal CW is not coupled to the first control voltage (e.g., high voltage), the pin detection circuit 108a and the adjustment control generation circuit 108b do not operate, the first comparison circuit 110c generates a corresponding first voltage control signal S11 based on the first divided detection voltage signal VP11 and the reference voltage signal Vref, and the second comparison circuit 110d generates a corresponding first current control signal S12 by comparing the first current feedback reference signal VP12 and the first detection current signal V1b. The first control signal CS1 includes the first voltage control signal S11 and the first current control signal S12 as feedback signals for voltage feedback control and current feedback control, respectively. The coupling circuit 111 generates a power conversion control signal CS to the power conversion control circuit 112 in response to the first control signal CS1, the power conversion control circuit 112 generates a conversion signal Sc to the power conversion circuit 102 in response to the power conversion control signal CS, the power conversion circuit 102 generates an output voltage Vout of 12V in response to the conversion signal Sc, and controls the maximum output current Iout to 5A.

[0043] As shown in the embodiment of Figure 2B, when the control terminal CW is not coupled to the first control voltage (e.g., high voltage), the first diode D1, the first switch Q1, and the second switch Q2 of the pin detection circuit 108a are turned off, so the pin detection circuit 108a does not operate, and correspondingly the third switch Q3 and the fourth switch Q4 of the adjustment control generation circuit 108b are controlled to turn off. The first detection voltage signal V1a is divided by the 12th resistor R12 and the 13th resistor R13 and sent to the reverse-phase input terminal (-) of the first operational amplifier OP1 as the first divided detection voltage signal VP11 (i.e., divided voltage) corresponding to the output voltage Vout of 12V. The first operational amplifier OP1 generates a first divided detection voltage signal VP11 and a reference voltage signal Vref, and generates a first voltage control signal S11 corresponding to the output voltage Vout of 12V. The 16th resistor R16 receives the first reference divided voltage signal Vref1 and generates a first current feedback reference signal VP12. The second operational amplifier OP2 compares the first current feedback reference signal VP12 with the first detection current signal V1b and generates a first current control signal S12.

[0044] When the control terminal CW is coupled to a first control voltage (for example, a high voltage), the first diode D1 is turned on because the first control voltage is greater than the breakdown voltage of the first diode D1. The voltage obtained by subtracting the breakdown voltage of the first diode D1 from the first control voltage is divided by the first resistor R1 and the second resistor R2 to become the first divided voltage VP1. Since the first divided voltage VP1 is greater than the threshold voltage of the first switch Q1, the first switch Q1 and the second switch Q2 are turned on, and the pin detection circuit 108a is activated. After the pin detection circuit 108a is activated, the voltage drop across the second switch Q2 is subtracted from the first voltage V1 and then divided by the fifth resistor R5 and the sixth resistor R6 to become the second divided voltage VP2. Since the second divided voltage VP2 is greater than the threshold voltages of the third switch Q3 and the fourth switch Q4, the third switch Q3 and the fourth switch Q4 are turned on, and the adjustment control generation circuit 108b is activated. When the third switch Q3 is turned on, the seventh resistor R7 is connected in parallel with the thirteenth resistor R13. Due to the decrease in resistance value caused by the parallel connection of the seventh resistor R7 with the thirteenth resistor R13, the voltage at the reverse-phase input terminal (-) of the first operational amplifier OP1 decreases. Since the voltage at the non-reverse-phase input terminal (+) of the first operational amplifier OP1 remains the reference voltage signal Vref, the first voltage control signal S11 and the first control signal CS1 generated by the first operational amplifier OP1, the power conversion control signal CS generated by the coupling circuit 111 based on the first control signal CS1, and the conversion signal Sc generated by the power conversion control circuit 112 based on the power conversion control signal CS cause the power conversion circuit 102 to correspondingly increase the output voltage Vout based on the conversion signal Sc, thereby converting the first detected voltage signal V1a into the first divided detected voltage signal VP11 (i.e., divided voltage). The voltage (JPEG2026079711000004.jpg34151) is raised until it equals the reference voltage signal Vref, and in this embodiment, the output voltage Vout in this case is 24V. Similarly, when the fourth switch Q4 is turned on, the eighth resistor R8 is connected in parallel with the eleventh resistor R11. The decrease in the resistance value due to the parallel connection of the eighth resistor R8 with the eleventh resistor R11 causes the voltage at the non-reverse-phase input terminal (+) of the second operational amplifier OP2 to decrease. The first current control signal S12 and the first control signal CS1 generated by the second operational amplifier OP2, the power conversion control signal CS generated by the coupling circuit 111 based on the first control signal CS1, and the conversion signal Sc generated by the power conversion control circuit 112 based on the power conversion control signal CS cause the power conversion circuit 102 to correspondingly reduce the output current Iout based on the conversion signal Sc, reducing the first detected current signal V1b to equal the first current feedback reference signal VP12. In this embodiment, the maximum output current Iout in this case is 2.5A.

[0045] As shown in the embodiment in Figure 2B, when the control terminal CW is coupled to the first control voltage, the first diode D1 is turned on, and the voltage drop across the first diode D1 is subtracted from the first voltage V1 and then divided by the first resistor R1 and the second resistor R2 to the gate g1 of the first switch Q1, thereby generating the first divided voltage VP1 and turning on the first switch Q1.

[0046] When the first divided voltage VP1 is greater than the threshold voltage of the first switch Q1 (e.g., 3.5V), the first switch Q1 is turned on, and the first voltage V1 is divided by the third resistor R3 and the fourth resistor R4 to the base B of the second switch Q2, thereby turning on the second switch Q2 and transmitting the first voltage V1 to the collector C of the second switch Q2 (the voltage drop across the second switch Q2 is much smaller than the first voltage V1 and can be ignored). The first voltage V1 at the collector C of the second switch Q2 is divided by the fifth resistor R5 and the sixth resistor R6 to the gate g3 of the third switch Q3 and the gate g4 of the fourth switch Q4, generating the second divided voltage VP2 (i.e., the detection signal). In one embodiment, the second divided voltage VP2 is approximately The filename is JPEG2026079711000005.jpg77151.

[0047] When the second voltage divider VP2 becomes greater than the threshold voltages of the third switch Q3 and the fourth switch Q4 (e.g., 3.5V), the third switch Q3 and the fourth switch Q4 are turned on. When the third switch Q3 is turned on, the seventh resistor R7 and the thirteenth resistor R13 are connected in parallel to set the voltage level at the reverse-phase input terminal (-) of the first operational amplifier OP1. The first detection voltage signal V1a is divided by the twelfth resistor R12, the seventh resistor R7, and the thirteenth resistor R13 and generated at the reverse-phase input terminal (-) of the first operational amplifier OP1, forming a first divided detection voltage signal VP11 with an output voltage Vout of 24V. The first operational amplifier OP1 compares the first divided detection voltage signal VP11 with a reference voltage signal Vref to generate a first voltage control signal S11 with an output voltage Vout of 24V. After the fourth switch Q4 is turned on, the eighth resistor R8 and the eleventh resistor R11 are connected in parallel and coupled to set the voltage level of the non-reverse-phase input terminal (+) of the second operational amplifier OP2. The reference voltage signal Vref is divided by the tenth resistor R10, the eighth resistor R8, and the eleventh resistor R11 to generate a first current feedback reference signal VP12 that limits the non-reverse-phase input terminal (+) of the second operational amplifier OP2 to a maximum output current Iout of 2.5A. The second operational amplifier OP2 compares the first current feedback reference signal VP12 with the first detected current signal V1b to generate a first current control signal S12 that limits the maximum output current Iout of 2.5A. The first voltage control signal S11 and the first current control signal S12 are sent to the coupling circuit 111. The coupling circuit 111 generates a first control signal CS1 that limits the output voltage Vout to 24V and the maximum output current Iout to 2.5A, and based on the first control signal CS1, the coupling circuit 111 generates a power conversion control signal CS to the power conversion control circuit 112 that limits the output voltage Vout to 24V and the maximum output current Iout to 2.5A, and based on the power conversion control signal CS, the power conversion control circuit 112 generates a conversion signal Sc to the power conversion circuit 102 that limits the output voltage Vout to 24V and the maximum output current Iout to 2.5A, and the power conversion circuit 102 generates the input voltage Vin as the output voltage Vout to 24V and controls the maximum output current Iout to 2.5A based on the conversion signal Sc.

[0048] Therefore, the output control circuit 108 and single-loop control circuit (i.e., the first feedback circuit 110) of the power supply device 100 shown in Figures 1 and 2A to 2B selectively couple the control terminal CW to a first control voltage (e.g., a high voltage) to control the output voltage Vout of the power supply device 100 to 12V or 24V, allowing the power supply device 100 to achieve the desired power output specification of 12V or 24V upon installation.

[0049] Figure 3 is a block diagram of another embodiment of the power supply device according to this disclosure. Please refer to Figures 1 and 3. The power supply device 100 in Figure 1 and the power supply device 100' in Figure 3 have a partially similar circuit structure, and both are used to supply power to the light-emitting diode 200 and have a power conversion circuit 102, a power conversion control circuit 112, a power factor correction circuit 114, a first capacitor C1, and a second capacitor C2. However, the technical details related to Figure 1 will not be explained in detail.

[0050] In the following embodiment, the output voltage Vout of the power supply device 100' is controlled to 12V or 24V by controlling the signal level of the control terminal CW of the output control circuit 108', and power is supplied to the light-emitting diode 200 with a voltage of 12V or a voltage of 24V accordingly. In other embodiments, the output voltage Vout of the power supply device 100' may be set to one of two or more other suitable voltages by controlling the signal level of the control terminal CW of the output control circuit 108'.

[0051] In this embodiment, the power conversion circuit 102 may be configured to have two types of power output specifications: 12V 60W and 24V 100W. When the control terminal CW is coupled to the first control voltage (e.g., high voltage), the output control circuit 108' is configured such that the second feedback circuit 110_2 operates accordingly. The output control circuit 108' and the first feedback circuit 110_1 and second feedback circuit 110_2 of the feedback circuit 110' generate a first control signal CS1 and a second control signal CS2 based on a first detected voltage signal V1a, a first detected current signal V1b, a second detected voltage signal V2a, and a second detected current signal V2b, and transmit them to the coupling circuit 111. The coupling circuit 111 generates a power conversion control signal CS based on the first control signal CS1 and the second control signal CS2 and transmits it to the power conversion control circuit 112. The power conversion control circuit 112 generates a conversion signal Sc based on the power conversion control signal CS and transmits it to the power conversion circuit 102. As a result, the power conversion circuit 102 performs a power conversion operation on the power input signal (i.e., input voltage Vin) based on the conversion signal Sc, setting the output voltage Vout to 24V, controlling the maximum output current to 4.1A, and setting the maximum output power to 100W.

[0052] If the control terminal CW is not coupled to the first control voltage (for example, it is grounded or floating), the output control circuit 108' is configured so that the second feedback circuit 110_2 does not operate accordingly. The first feedback circuit 110_1 of the output control circuit 108' and the feedback circuit 110' generates a first control signal CS1 based on the first detected voltage signal V1a and the first detected current signal V1b and transmits it to the coupling circuit 111. The coupling circuit 111 generates a power conversion control signal CS based on the first control signal CS1 and transmits it to the power conversion control circuit 112. The power conversion control circuit 112 generates a conversion signal Sc based on the power conversion control signal CS and transmits it to the power conversion circuit 102. As a result, the power conversion circuit 102 performs a power conversion operation on the input voltage Vin based on the conversion signal Sc, setting the output voltage Vout to 12V, controlling the maximum output current to 5A, and setting the maximum output power to 60W.

[0053] As shown in Figure 3, the power supply device 100' includes a current detection circuit 104'.

[0054] The current detection circuit 104' includes a first shunt resistor Ra and a second shunt resistor Rb. The first end of the second shunt resistor Rb is coupled to the second end of the first shunt resistor Ra, while the second end is coupled to the cathode LED (-) of the light-emitting diode 200 and to the first output terminal 102c and the anode LED (+) of the light-emitting diode 200 via a second capacitor C2. Since the voltages across the first shunt resistor Ra and the second shunt resistor Rb are positively correlated with the currents flowing through them, respectively, the voltage values ​​of the first shunt resistor Ra and the second shunt resistor Rb can be used as the first detected current signal V1b and the second detected current signal V2b, respectively, to detect the current flowing through the current detection circuit 104'.

[0055] As shown in Figure 3, the power supply device 100' includes an output control circuit 108' which is coupled to the first output terminal 102c and the feedback circuit 110'.

[0056] As shown in Figure 3, the power supply device 100' includes a feedback circuit 110' which includes a first feedback circuit 110_1 and a second feedback circuit 110_2. In one embodiment, the first feedback circuit 110_1 has a circuit structure similar to the first feedback circuit 110 in Figure 1, so the technical details of the first feedback circuit 110_1 related to Figure 1 will not be explained in detail.

[0057] As shown in the embodiment of Figure 3, the second feedback circuit 110_2 is coupled to the first output terminal 102c so that its first terminal receives the second detection voltage signal V2a, while its second terminal is coupled to the current detection circuit 104' and the cathode LED(-) of the light-emitting diode 200 so that it receives the second detection current signal V2b. The second feedback circuit 110_2 is further coupled to the output control circuit 108' so that it selectively receives the first voltage V1. Based on the second detection voltage signal V2a and the second detection current signal V2b, and in accordance with the output control circuit 108' (i.e., whether the first voltage V1 has been received), the second feedback circuit 110_2 generates a second control signal CS2. In one embodiment, the second feedback circuit 110_2 has a circuit structure similar to the first feedback circuit 110 and the first feedback circuit 110_1 in Figure 1, the second detected voltage signal V2a is equal to or approximates the voltage value of the first voltage V1, and the second detected current signal V2b is the voltage value at the second shunt resistor Rb.

[0058] The coupling circuit 111 is coupled to the first feedback circuit 110_1 and the second feedback circuit 110_2 to receive the first control signal CS1 and the second control signal CS2, and is used to generate a power conversion control signal CS based on the first control signal CS1 and the second control signal CS2.

[0059] The power conversion control circuit 112 is coupled to the coupling circuit 111 and is used to generate a conversion signal Sc based on the power conversion control signal CS. The power conversion circuit 102 is coupled to the power conversion control circuit 112 and converts the input voltage Vin to an output voltage Vout at an appropriate voltage level based on the conversion signal Sc generated by the power conversion control circuit 112.

[0060] Figure 4A is a partial circuit diagram of the power supply device 100' shown in Figure 3. For ease of explanation, Figure 4A shows only the power conversion circuit 102, the output control circuit 108', the first feedback circuit 110_1, the second feedback circuit 110_2, the coupling circuit 111, and the power conversion control circuit 112. Please refer to Figures 2A and 4A simultaneously, as the power conversion circuit 102 and power conversion control circuit 112 in Figures 2A and 4A, the output control circuit 108 in Figure 2A and the output control circuit 108' in Figure 4A, and the first feedback circuit 110 in Figure 2A (including the first voltage divider circuit 110a, the first current feedback reference setting circuit 110b, the first comparator circuit 110c, and the second comparator circuit 110d) and the first feedback circuit 110_1 in Figure 4A (including the first voltage divider circuit 110_1a, the first current feedback reference setting circuit 110_1b, the first comparator circuit 110_1c, and the second comparator circuit 110_1d) have the same or similar circuit structure. Therefore, the technical details of Figure 2A will not be explained in detail.

[0061] As shown in Figure 4A, when the control terminal CW is coupled to the first control voltage (e.g., a high voltage), the pin detection circuit 108a is configured to activate the adjustment control generation circuit 108b and to provide the first voltage V1 as a working voltage to the second feedback circuit 110_2 so that the second feedback circuit 110_2 receives the first voltage V1 and operates. However, when the control terminal CW is not coupled to the first control voltage (e.g., floating, grounded, or at an appropriate voltage level such as a second control voltage smaller than the first control voltage), the pin detection circuit 108a is configured not to activate the adjustment control generation circuit 108b and to not provide the first voltage V1 as a working voltage to the second feedback circuit 110_2 so that the second feedback circuit 110_2 does not receive the first voltage V1 and does not operate.

[0062] As shown in Figure 4A, the power supply device 100' includes a first feedback circuit 110_1 and a second feedback circuit 110_2. In one embodiment, the second feedback circuit 110_2 has a circuit structure similar to that of the first feedback circuit 110_1. In one embodiment, as shown in Figure 4A, the second feedback circuit 110_2 includes a second voltage divider circuit 110_2a, a second current feedback reference setting circuit 110_2b, a third comparator circuit 110_2c, and a fourth comparator circuit 110_2d. The second voltage divider circuit 110_2a and the third comparator circuit 110_2c provide voltage feedback control functionality, while the second current feedback reference setting circuit 110_2b and the fourth comparator circuit 110_2d provide current feedback control functionality. The second voltage divider circuit 110_2a is coupled to the first output terminal 102c to receive the second detection voltage signal V2a and generates a second divided detection voltage signal VP21 based on the second detection voltage signal V2a. The second current feedback reference setting circuit 110_2b is coupled to the second voltage divider circuit 110_2a to receive the divided voltage of the second detection voltage signal V2a and generates a second current feedback reference signal VP22 based on the divided voltage of the second detection voltage signal V2a. The third comparator circuit 110_2c is coupled to the second voltage divider circuit 110_2a and the pin detection circuit 108a and does not operate if the pin detection circuit 108a does not provide the first voltage V1 to the third comparator circuit 110_2c, but operates if the pin detection circuit 108a provides the first voltage V1 to the third comparator circuit 110_2c and is used to generate a second voltage control signal S21 based on the second divided detection voltage signal VP21. The fourth comparator circuit 110_2d is coupled to the second current feedback reference setting circuit 110_2b and the pin detection circuit 108a. It does not operate if the pin detection circuit 108a does not provide the first voltage V1 to the fourth comparator circuit 110_2d, but it operates when the pin detection circuit 108a provides the first voltage V1 to the fourth comparator circuit 110_2d, and is used to generate a second current control signal S22 based on the second current feedback reference signal VP22 and the second detected current signal V2b. In one embodiment, the second control signal CS2 consists of a second voltage control signal S21 and a second current control signal S22.In one embodiment, the output voltage Vout corresponding to the power conversion circuit 102 of the second voltage-divided detection voltage signal VP21 and the second voltage control signal S21 is 24V, and the output current Iout corresponding to the power conversion circuit 102 of the second current feedback reference signal VP22 and the second current control signal S22 is 4.1A.

[0063] As shown in the embodiment of Figure 4A, the coupling circuit 111 is coupled to the first comparator circuit 110_1c, the second comparator circuit 110_1d, the third comparator circuit 110_2c, and the fourth comparator circuit 110_2d to receive the first control signal CS1 and the second control signal CS2, and generates a corresponding power conversion control signal CS based on the first control signal CS1 and the second control signal CS2.

[0064] Please refer to Figure 4B, which is a specific circuit architecture diagram of the power supply device 100' shown in Figure 4A. Please refer to Figures 2B and 4B simultaneously, as the pin detection circuit 108a and the adjustment control generation circuit 108b in Figures 2B and 4B have the same or similar circuit structures; therefore, the technical details of Figure 2B will not be explained in detail.

[0065] Please refer to Figures 2B and 4B simultaneously. Since the first voltage divider circuit 110_1a, the first current feedback reference setting circuit 110_1b, the first comparison circuit 110_1c, and the second comparison circuit 110_1d in Figure 4B are the same as or similar in circuit structure to the first voltage divider circuit 110a, the first current feedback reference setting circuit 110b, the first comparison circuit 110c, and the second comparison circuit 110d in Figure 2B, the technical details of Figure 2B will not be explained in detail.

[0066] As shown in the embodiment of Figure 4B, the second voltage divider circuit 110_2a includes the 19th resistor R19, the 20th resistor R20, the 21st resistor R21, the 22nd resistor R22, and the 23rd resistor R23; the second current feedback reference setting circuit 110_2b includes the 8th capacitor C16 and the 26th resistor R26; the third comparator circuit 110_2c includes the 4th diode D4, the 7th capacitor C15, the 24th resistor R24, the 25th resistor R25, and the 3rd operational amplifier OP3; and the 4th comparator circuit 110_2d includes the 5th diode D5, the 9th capacitor C17, the 27th resistor R27, the 28th resistor R28, and the 4th operational amplifier OP4. The coupling circuit 111 may, for example, employ an appropriate signal transmission method such as an electrical signal, an optical signal, or a magnetic signal to transmit the first control signal CS1 of the first feedback circuit 110_1 and the second control signal CS2 of the second feedback circuit 110_2 to the power conversion control circuit 112. In one embodiment, the coupling circuit 111 includes a photodiode coupled to the first comparator circuit 110_1c, the second comparator circuit 110_1d, the third comparator circuit 110_2c, and the fourth comparator circuit 110_2d to convert the first control signal CS1 and the second control signal CS2 into optical signals, and a photodetector that receives the optical signals, converts them into a power conversion control signal CS, and transmits them to the power conversion control circuit 112.

[0067] The 19th resistor R19 has its first terminal receive the second detection voltage signal V2a. The 20th resistor R20 is connected to the second terminal of the 19th resistor R19 so that its first terminal receives the reference voltage signal Vref. The 21st resistor R21 has its first terminal connected to the second terminal of the 20th resistor R20, but its second terminal is grounded. The 22nd resistor R22 has its first terminal receive the second detection voltage signal V2a. The 23rd resistor R23 has its first terminal connected to the second terminal of the 22nd resistor R22, but its second terminal is grounded. The third operational amplifier OP3 receives a reference voltage signal Vref. Its non-reverse-phase input terminal (+) is coupled to the second terminal of resistor R19 and the first terminal of resistor R20, while its reverse-phase input terminal (-) is coupled to the second terminal of resistor R22 and the first terminal of resistor R23. Its positive power terminal Vs+ is coupled to the collector C of switch Q2, while its negative power terminal Vs- is grounded. The first terminal of resistor R24 ​​is coupled to the reverse-phase input terminal (-) of the third operational amplifier OP3. The first terminal of capacitor C15 is coupled to the second terminal of resistor R24, while its second terminal is coupled to the third amplification output terminal V of the third operational amplifier OP3. o3 The 25th resistor R25 has its first end connected to the second end of the 7th capacitor C15 and the third amplification output terminal V of the 3rd operational amplifier OP3. o3 The fourth diode D4 has its first terminal connected to the second terminal of the 25th resistor R25. The 26th resistor R26 has its first terminal connected to the second terminal of the 20th resistor R20 and the first terminal of the 21st resistor R21. The 8th capacitor C16 has its first terminal connected to the second terminal of the 26th resistor R26, but its second terminal is grounded. The fourth operational amplifier OP4 has its non-reverse-phase input terminal (+) connected to the second terminal of the 26th resistor R26 and the first terminal of the 8th capacitor C16, but its reverse-phase input terminal (-) receives the second detection current signal V2b, and its positive power terminal Vs+ is connected to the positive power terminal Vs+ of the third operational amplifier OP3 and the collector C of the second switch Q2, but its negative power terminal Vs- is grounded. The 27th resistor R27 has its first terminal connected to the reverse-phase input terminal (-) of the fourth operational amplifier OP4. The ninth capacitor C17 has its first end connected to the second end of the 27th resistor R27, but its second end is connected to the fourth amplification output terminal V of the fourth operational amplifier OP4. o4 The 28th resistor R28 has its first end connected to the second end of the 9th capacitor C17 and the fourth amplification output terminal V of the 4th operational amplifier OP4.o4 The fifth diode D5 has its first end connected to the second end of the 28th resistor R28, but its second end is connected to the second end of the fourth diode D4.

[0068] In one embodiment, the 13th resistor R13 is greater than the 23rd resistor R23, and the resistance value of the 23rd resistor R23 is substantially equal to the resistance value of the 7th resistor R7 and the 13th resistor R13 connected in parallel. The 11th resistor R11 is greater than the 21st resistor R21, and the resistance value of the 21st resistor R21 is substantially equal to the resistance value of the 8th resistor R8 and the 11th resistor R11 connected in parallel.

[0069] In one embodiment, the reference voltage signal Vref is divided by the 20th resistor R20 and the 21st resistor R21 to generate a second reference divided voltage signal Vref2, and the second reference divided voltage signal Vref2 has a voltage The file is JPEG2026079711000006.jpg51151,

[0070] Furthermore, the first reference voltage divider signal Vref1 = This is essentially equivalent to JPEG2026079711000007.jpg33151.

[0071] Therefore, if the control terminal CW is not coupled to the first control voltage (e.g., high voltage), the pin detection circuit 108a, the adjustment control generation circuit 108b, and the second feedback circuit 110_2 will not operate. In the first feedback circuit 110_1, the first detection voltage signal V1a is divided by the 12th resistor R12 and the 13th resistor R13 and sent to the reverse-phase input terminal (-) of the first operational amplifier OP1 as the first divided detection voltage signal VP11 (i.e., divided voltage) corresponding to the output voltage Vout of 12V. The first operational amplifier OP1 generates a first divided detection voltage signal VP11 and a reference voltage signal Vref, and generates a first voltage control signal S11 corresponding to the output voltage Vout of 12V. The 16th resistor R16 receives the first reference divided voltage signal Vref1 and generates a first current feedback reference signal VP12. The second operational amplifier OP2 compares the first current feedback reference signal VP12 with the first detection current signal V1b and generates a first current control signal S12. Therefore, the first comparator circuit 110_1c generates a corresponding first voltage control signal S11 based on the first divided detection voltage signal VP11 and the reference voltage signal Vref, and the second comparator circuit 110_1d generates a corresponding first current control signal S12 by comparing the first current feedback reference signal VP12 with the first detection current signal V1b. The first control signal CS1 includes a first voltage control signal S11 and a first current control signal S12, respectively, as feedback signals for voltage feedback control and current feedback control. The coupling circuit 111 generates a power conversion control signal CS to the power conversion control circuit 112 in correspondence based on the first control signal CS1, and the power conversion control circuit 112 generates a conversion signal Sc to the power conversion circuit 102 in correspondence based on the power conversion control signal CS, so that the power conversion circuit 102 generates an output voltage Vout of 12V in correspondence based on the conversion signal Sc, and controls the maximum output current Iout to 5A.

[0072] As shown in the embodiment of Figure 4B, if the control terminal CW is not coupled to the first control voltage (e.g., high voltage), the first diode D1, first switch Q1, and second switch Q2 of the pin detection circuit 108a are turned off, so the pin detection circuit 108a does not operate. Correspondingly, the third switch Q3 and fourth switch Q4 of the adjustment control generation circuit 108b are controlled to turn off, and the first voltage V1 is not provided to the third operational amplifier OP3 and the fourth operational amplifier OP4. As a result, the third operational amplifier OP3 and the fourth operational amplifier OP4 do not receive the first voltage V1, and the third comparator circuit 110_2c and the fourth comparator circuit 110_2d, respectively, do not operate. However, if the control terminal CW of the power supply device 100' is not coupled to the first control voltage (e.g., high voltage), the output control circuit 108 does not provide the first voltage V1 to the second feedback circuit 110_2, so the second feedback circuit 110_2 does not operate.

[0073] When the control terminal CW is coupled to a first control voltage (for example, a high voltage), the first diode D1 is turned on because the first control voltage is greater than the breakdown voltage of the first diode D1. The voltage obtained by subtracting the breakdown voltage of the first diode D1 from the first control voltage is divided by the first resistor R1 and the second resistor R2 to become the first divided voltage VP1. Since the first divided voltage VP1 is greater than the threshold voltage of the first switch Q1, the first switch Q1 and the second switch Q2 are turned on, and the pin detection circuit 108a is activated. After the pin detection circuit 108a is activated, the voltage drop across the second switch Q2 is subtracted from the first voltage V1 and then divided by the fifth resistor R5 and the sixth resistor R6 to become the second divided voltage VP2. Since the second divided voltage VP2 is greater than the threshold voltages of the third switch Q3 and the fourth switch Q4, the third switch Q3 and the fourth switch Q4 are turned on, and the adjustment control generation circuit 108b is activated. Furthermore, after the pin detection circuit 108a is activated, the second switch Q2 is turned on, transmitting the first voltage V1 to the third comparator circuit 110_2c and the fourth comparator circuit 110_2d, causing the third comparator circuit 110_2c and the fourth comparator circuit 110_2d to activate. When the third switch Q3 is turned on, the seventh resistor R7 is connected in parallel with the thirteenth resistor R13. Due to the decrease in the resistance value of the seventh resistor R7 connected in parallel with the thirteenth resistor R13, the voltage at the reverse-phase input terminal (-) of the first operational amplifier OP1 decreases. Since the voltage at the non-reverse-phase input terminal (+) of the first operational amplifier OP1 and the third operational amplifier OP3 remains the reference voltage signal Vref, the first voltage control signal S11 generated by the first operational amplifier OP1, the second voltage control signal S21 generated by the third operational amplifier OP3, the first control signal CS1, the second control signal CS2, the power conversion control signal CS generated by the coupling circuit 111 based on the first control signal CS1 and the second control signal CS2, and the conversion signal Sc generated by the power conversion control circuit 112 based on the power conversion control signal CS cause the power conversion circuit 102 to correspondingly increase the output voltage Vout based on the conversion signal Sc, and the first detected voltage signal V1a becomes the first divided detected voltage signal VP11 (i.e., divided voltage). The voltage (JPEG2026079711000009.jpg36151) rises until it becomes equal to the reference voltage signal Vref, and in this embodiment, the output voltage Vout in this case is 24V. Similarly, when the fourth switch Q4 is turned on, the eighth resistor R8 is connected in parallel with the eleventh resistor R11, and the voltage at the non-reverse-phase input terminal (+) of the second operational amplifier OP2 decreases due to the decrease in the resistance value of the parallel connection. The first current control signal S12 generated by the second operational amplifier OP2, the second current control signal S22 generated by the fourth operational amplifier OP4, the first control signal CS1, the second control signal CS2, the power conversion control signal CS generated by the coupling circuit 111 based on the first control signal CS1 and the second control signal CS2, and the conversion signal Sc generated by the power conversion control circuit 112 based on the power conversion control signal CS, cause the power conversion circuit 102 to decrease the output current Iout in correspondence based on the conversion signal Sc, and to decrease the first detected current signal V1b until it becomes equal to the first current feedback reference signal VP12. In this embodiment, the maximum output current Iout in this case is 4.1A.

[0074] The second detection voltage signal V2a is divided by the 22nd resistor R22 and the 23rd resistor R23 and generated at the reverse-phase input terminal (-) of the third operational amplifier OP3 to form a second divided detection voltage signal VP21 having an output voltage of 24V Vout. The third operational amplifier OP3 compares the second divided detection voltage signal VP21 with the reference voltage signal Vref to generate a second voltage control signal S21 having an output voltage of 24V Vout. The reference voltage signal Vref is divided by the 20th resistor R20 and the 21st resistor R21 to generate a second reference divided voltage signal Vref2 to the 26th resistor R26. Based on the second reference divided voltage signal Vref2, the 26th resistor R26 generates a second current feedback reference signal VP22 to the non-reverse-phase input terminal (+) of the 4th operational amplifier OP4, which limits the maximum output current Iout to 4.1A. The 4th operational amplifier OP4 compares the second current feedback reference signal VP22 with the second detected current signal V2b to generate a second current control signal S22, which limits the maximum output current Iout to 4.1A. The second voltage control signal S21 and the second current control signal S22 are used to send an output voltage of 24V Vout and 4.1A to the coupling circuit 111. A second control signal CS2 is formed to limit the maximum output current Iout. Based on the first control signal CS1 and the second control signal CS2, the coupling circuit 111 generates a power conversion control signal CS that limits the output voltage Vout to 24V and the maximum output current Iout to 4.1A to the power conversion control circuit 112. Based on the power conversion control signal CS, the power conversion control circuit 112 generates a conversion signal Sc that limits the output voltage Vout to 24V and the maximum output current Iout to 4.1A to the power conversion circuit 102. Based on the conversion signal Sc, the power conversion circuit 102 generates the input voltage Vin as the output voltage Vout of 24V and controls the maximum output current Iout to 4.1A.

[0075] Depending on the maximum output power of the power supply, the power supply is required to meet the requirements of the corresponding safety standards. For example, if the output power of the power supply is 60W, a single feedback circuit is sufficient. If the output power of the power supply is 100W, two feedback circuits must be used, and even if either of the two feedback circuits fails, the single feedback circuit can still operate normally. Therefore, by providing this redundant feedback circuit design, compliance with safety standards (e.g., UL 8750 Class 2 safety standards) can be achieved.

[0076] Therefore, according to the power supply devices 100 and 100' of the above embodiment, whether a single feedback circuit is used or two or more feedback circuits with a redundant design are used, in either case the control terminal CW is selectively coupled to the first control voltage (e.g., high voltage) and the output voltage Vout of the power supply device 100' is controlled to 12V or 24V, thereby achieving different output voltages and correspondingly setting the output currents to provide different output powers, and achieving the functions of constant voltage control and / or constant current control.

[0077] While the present disclosure is illustrated in the embodiments described above, these embodiments are not intended to limit the present disclosure. Those skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present disclosure. Accordingly, the scope of protection of the present disclosure should be determined based on the appended claims. [Explanation of Symbols]

[0078] 100,100': Power supply equipment 102: Power Conversion Circuit 102a: First input terminal 102b: Second input terminal 102c: First output terminal 102d: Second output terminal 102X: Switch-mode power converter 104,104': Current detection circuit 108,108': Output control circuit 108a: Pin detection circuit 108b: Control and regulation generation circuit 110': Feedback circuit 110,110_1: First feedback circuit 110_2: Second Feedback Circuit 110a, 110_1a: First voltage divider circuit 110b, 110_1b: First current feedback reference setting circuit 110c,110_1c: 1st comparison circuit 110d,110_1d: Second comparison circuit 110_2a: Second voltage divider circuit 110_2b: Second current feedback reference setting circuit 110_2c: Third comparison circuit 110_2d: 4th comparison circuit 111: Combined circuit 112: Power Conversion Control Circuit 114: Power Factor Correction Circuit 114a: First AC input terminal 114b: Second AC input terminal 114c: 1st power factor correction output terminal 114d: 2nd power factor improvement output terminal 200: Light-emitting diode CW: Control terminal LED(+):Anode LED(-):Cathode V1: First voltage V1a: First detection voltage signal V1b: First detected current signal V2a: Second detection voltage signal V2b: Second detection current signal Vin: Input voltage Vout: Output voltage Iout: Output current I / P: Original Voltage CS1: First control signal CS2: Second control signal CS: Power Conversion Control Signal Sc: Conversion signal C1: First capacitor C2: Second capacitor Ra: First shunt resistance Rb: Second shunt resistor R1: First resistor R2: 2nd resistance R3: 3rd resistor R4: 4th resistor R5: 5th resistor R6: 6th resistor R7: 7th resistor R8: 8th resistor R9: 9th resistance R10: 10th resistor R11: 11th resistor R12: 12th resistor R13: 13th resistor R14: 14th resistor R15: 15th resistor R16: 16th resistor R17: 17th resistor R18: 18th resistor R19: 19th resistor R20: 20th resistance R21: 21st resistor R22: 22nd resistor R23: 23rd resistor R24: 24th resistor R25: 25th resistor R26: 26th resistor R27: 27th resistor R28: 28th resistor D1: First diode D2: Second diode D3: Third diode D4: Fourth diode D5: Fifth diode Q1: First switch Q2: Second switch Q3: Third switch Q4: Fourth switch C11: Third capacitor C12: Fourth capacitor C13: Fifth capacitor C14: 6th Capacitor C15: The 7th capacitor C16: The 8th capacitor C17: The 9th capacitor VP1: The 1st voltage division VP11: The 1st divided detection voltage signal VP12: The 1st current feedback reference signal VP21: The 2nd divided detection voltage signal VP22: The 2nd current feedback reference signal VP2: The 2nd voltage division Vref: Reference voltage signal Vref1: The 1st reference divided voltage signal Vref2: The 2nd reference divided voltage signal g1,g3,g4: Gate d1,d3,d4: Drain s1,s3,s4: Source E: Emitter B: Base C: Collector OP1: The 1st operational amplifier OP2: The 2nd operational amplifier OP3: The 3rd operational amplifier OP4: The 4th operational amplifier +: Non-inverting input terminal ‐: Inverting input terminal Vs+: Positive power terminal Vs‐: Negative power terminal V o1 : The 1st amplified output terminal V o2 : The 2nd amplified output terminal V o3 : The 3rd amplified output terminal V o4 : The 4th amplified output terminal S11: The 1st voltage control signal S12: The 1st current control signal S21: The 2nd voltage control signal S22: The 2nd current control signal N1: The 1st winding N2: The 2nd winding

Claims

1. In a power supply device for supplying power to a load, A power conversion circuit including a first input terminal and a second input terminal for receiving an input voltage, and a first output terminal and a second output terminal for coupling to the load, An output control circuit coupled to the first output terminal and having a control terminal, A current detection circuit including a first terminal connected to the second output terminal of the power conversion circuit and a second terminal connected to the load, A first feedback circuit is coupled to the first output terminal of the power conversion circuit to receive a first detection voltage signal, coupled to the current detection circuit to receive a first detection current signal, and coupled to the output control circuit to generate a corresponding first control signal. A coupling circuit coupled to the first feedback circuit to receive the first control signal and to generate a power conversion control signal based on the first control signal, A power conversion control circuit, coupled to the coupling circuit and the power conversion circuit, generates a conversion signal based on the power conversion control signal, Equipped with, When the control terminal of the output control circuit is coupled to the first control voltage, the output control circuit is configured such that the first feedback circuit generates the first control signal, and the power conversion circuit generates a corresponding first output voltage and limits the output current to a first maximum output current based on the first control signal. When the control terminal of the output control circuit is coupled to the second control voltage, the output control circuit is configured such that the first feedback circuit generates the first control signal, and the power conversion circuit generates a second output voltage in response to the first control signal and limits the output current to a second maximum output current. A power supply device in which the first control voltage is greater than the second control voltage, the first output voltage is greater than the second output voltage, and the first maximum output current is less than the second maximum output current.

2. The output control circuit is, A pin detection circuit coupled to the first output terminal and the control terminal, A control generation circuit coupled to the pin detection circuit and the first feedback circuit, It further includes, The first feedback circuit is, A first voltage divider circuit is coupled to the first output terminal to receive the first detection voltage signal and is coupled to the reference voltage signal and the adjustment control generation circuit to generate a first voltage divided detection voltage signal, A first current feedback reference setting circuit, coupled to the first voltage divider circuit and the adjustment control generation circuit, for generating a first current feedback reference signal based on the reference voltage signal, A first comparison circuit coupled to the first voltage divider circuit and for generating a first voltage control signal by comparing the first voltage-divided detection voltage signal with the reference voltage signal, A second comparison circuit coupled to the first current feedback reference setting circuit and for generating a first current control signal by comparing the first current feedback reference signal and the first detected current signal, It further includes, The coupling circuit is configured such that the first comparator circuit and the second comparator circuit are coupled together, and the power conversion control signal is generated correspondingly based on the first voltage control signal and the first current control signal. When the control terminal is coupled to the second control voltage, the pin detection circuit and the adjustment control generation circuit do not operate, the first voltage divider circuit divides the first detection voltage signal to generate the first divided detection voltage signal having a first level, the first current feedback reference setting circuit generates a first current feedback reference signal of a third level based on the first reference divided voltage signal generated by the reference voltage signal, and the power conversion circuit generates the second output voltage and limits the output current to a second maximum output current. When the control terminal is coupled to the first control voltage, the pin detection circuit is configured to activate the adjustment control generation circuit, thereby causing the adjustment control generation circuit to change the resistance value of one or more points coupled to the first feedback circuit, the first voltage divider circuit to divide the first detection voltage signal to generate the first divided detection voltage signal having a second level, the first current feedback reference setting circuit to generate the first current feedback reference signal of a fourth level based on the first reference voltage divider signal, and the power conversion circuit to generate the first output voltage and limit the output current to a first maximum output current, according to claim 1.

3. When the control terminal is coupled to the second control voltage, the pin detection circuit and the adjustment control generation circuit do not operate, and the first comparison circuit compares the divided voltage value of the first detection voltage signal by the first voltage divider circuit with the reference voltage signal and generates the first voltage control signal. The power supply device according to claim 2, further comprising: the second comparison circuit comparing the first detected current signal with the first reference voltage divided signal generated by dividing the reference voltage signal, and generating the first current control signal.

4. When the control terminal is coupled to the first control voltage, the pin detection circuit is configured to activate the adjustment control generation circuit, thereby connecting the seventh resistor in parallel with the resistor in the first voltage divider circuit, changing the divided voltage value of the first detection voltage signal, and the first comparison circuit compares the changed divided voltage value with the reference voltage signal to generate the first voltage control signal. The power supply device according to claim 2, wherein an eighth resistor is connected in parallel to the resistors in the first voltage divider circuit and the first current feedback reference setting circuit to change the value of the first reference voltage divider signal generated by dividing the reference voltage signal, and the second comparison circuit compares the first detected current signal with the changed first reference voltage divider signal to generate the first current control signal.

5. The power conversion circuit further comprises a second feedback circuit which is coupled to the first output terminal to receive a second detection voltage signal, coupled to the current detection circuit to receive a second detection current signal, and coupled to the output control circuit to generate a second control signal correspondingly based on the configuration of the output control circuit. The coupling circuit is used to receive the first control signal and the second control signal by coupling the first feedback circuit and the second feedback circuit, and to generate the power conversion control signal based on the first control signal and the second control signal. The power supply device according to claim 1, wherein when the control terminal of the output control circuit is coupled to the first control voltage, the output control circuit is configured such that the second feedback circuit generates the second control signal, and the power conversion circuit generates the first output voltage in correspondence with the first control signal and the second control signal, and limits the output current to the first maximum output current, and when the control terminal of the output control circuit is coupled to the second control voltage, the output control circuit is configured such that the second feedback circuit does not operate.

6. The output control circuit is, A pin detection circuit coupled to the first output terminal and the control terminal, A control generation circuit coupled to the pin detection circuit and the first feedback circuit, It further includes, The first feedback circuit is, A first voltage divider circuit is coupled to the first output terminal to receive the first detection voltage signal and is coupled to the reference voltage signal and the adjustment control generation circuit to generate a first voltage divided detection voltage signal, A first current feedback reference setting circuit, coupled to the first voltage divider circuit and the adjustment control generation circuit, for generating a first current feedback reference signal based on the reference voltage signal, A first comparison circuit coupled to the first voltage divider circuit and for generating a first voltage control signal by comparing the first voltage-divided detection voltage signal with the reference voltage signal, A second comparison circuit coupled to the first current feedback reference setting circuit and for generating a first current control signal by comparing the first current feedback reference signal and the first detected current signal, It further includes, The second feedback circuit is, A second voltage divider circuit is coupled to the first output terminal to receive the second detection voltage signal and is coupled to the reference voltage signal to generate a second voltage-divided detection voltage signal. A second current feedback reference setting circuit coupled to the second voltage divider circuit for generating a second current feedback reference signal based on the reference voltage signal, A third comparison circuit is coupled to the second voltage divider circuit and the pin detection circuit, and when the pin detection circuit provides a working voltage, it compares the second voltage divided detection voltage signal with the reference voltage signal to generate a second voltage control signal. A fourth comparison circuit is coupled to the second current feedback reference setting circuit and the pin detection circuit, and when the pin detection circuit provides the working voltage, it compares the second current feedback reference signal and the second detected current signal to generate a second current control signal, It further includes, The coupling circuit is coupled with the first comparator circuit, the second comparator circuit, the third comparator circuit and the fourth comparator circuit, and generates the power conversion control signal correspondingly based on the first voltage control signal and the first current control signal, and / or based on the second voltage control signal and the second current control signal. When the control terminal is coupled to the second control voltage, the pin detection circuit, the adjustment control generation circuit, and the second feedback circuit do not operate; the first voltage divider circuit divides the first detection voltage signal to generate the first divided detection voltage signal having a first level; the first current feedback reference setting circuit generates a first current feedback reference signal of a third level based on the first reference divided voltage signal generated by the reference voltage signal; and the power conversion circuit generates the second output voltage and limits the output current to the second maximum output current. When the control terminal is coupled to the first control voltage, the pin detection circuit is configured to activate the adjustment control generation circuit, thereby changing one or more resistance values ​​coupled to the first feedback circuit, the first voltage divider circuit divides the first detection voltage signal to generate the first divided detection voltage signal having a second level, the first current feedback reference setting circuit generates the first current feedback reference signal of a fourth level based on the first reference voltage divider signal, the power conversion circuit generates the first output voltage and limits the output current to the first maximum output current, and the pin detection circuit provides the working voltage to the second feedback circuit so that the second voltage divider circuit divides the second detection voltage signal to generate the second divided detection voltage signal having a second level, and the second current feedback reference setting circuit generates the second current feedback reference signal of a fourth level based on the second reference voltage divider signal generated by dividing the reference voltage signal.

7. When the control terminal is coupled to the second control voltage, the pin detection circuit, the adjustment control generation circuit, and the second feedback circuit do not operate, and the first comparison circuit compares the voltage division of the first detection voltage signal by the first voltage divider circuit with the reference voltage signal and generates the first voltage control signal. The power supply device according to claim 6, further comprising: the second comparison circuit comparing the first detected current signal with the first reference voltage divided signal generated by dividing the reference voltage signal, and generating the first current control signal.

8. When the control terminal is coupled to the first control voltage, the pin detection circuit is configured to activate the adjustment control generation circuit, thereby connecting the seventh resistor in parallel with the resistor in the first voltage divider circuit, changing the voltage division value of the first detection voltage signal, the first comparison circuit compares the changed voltage division value with the reference voltage signal, and generates the first voltage-divided detection voltage signal. Furthermore, the eighth resistor is connected in parallel to the resistors in the first voltage divider circuit and the first current feedback reference setting circuit, thereby changing the value of the first reference voltage divider signal generated by dividing the reference voltage signal, and the second comparison circuit compares the first detected current signal with the changed first reference voltage divider signal and generates the first current feedback reference signal. The power supply device according to claim 6, wherein the pin detection circuit provides the working voltage to the third and fourth comparison circuits, the third comparison circuit compares the voltage division of the second detection voltage signal by the second voltage divider circuit with the reference voltage signal and generates the second voltage control signal, and the fourth comparison circuit compares the second detection current signal with the second reference voltage divider signal generated by dividing the reference voltage signal and generates the second current control signal.

9. The power supply device according to claim 6, wherein the second voltage divider circuit divides the second detection voltage signal to generate the second divided detection voltage signal having the second level, the second current feedback reference setting circuit generates the second current feedback reference signal of the fourth level based on the second reference voltage divider signal, and the power conversion circuit generates the first output voltage and limits the output current to the first maximum output current.

10. In the operation method of a power supply device for supplying power to a load, The power supply device comprises: a power conversion circuit including a first input terminal and a second input terminal, a first output terminal and a second output terminal for coupling to the load; an output control circuit coupled to the first output terminal and having a control terminal; a current detection circuit including a first terminal coupled to the second output terminal of the power conversion circuit and a second terminal for coupling to the load; a first feedback circuit coupled to the first output terminal of the power conversion circuit, the current detection circuit and the output control circuit; a coupling circuit coupled to the first feedback circuit; and a power conversion control circuit coupled to the coupling circuit and the power conversion circuit. The aforementioned operating method is The first input terminal and the second input terminal of the power conversion circuit are set to receive the input voltage, and the first output terminal and the second output terminal of the power conversion circuit are used to supply power to the load. The first feedback circuit is configured to receive a first detection voltage signal from the first output terminal of the power conversion circuit and a first detection current signal from the current detection circuit, thereby generating a first control signal. The coupling circuit is configured to receive the first control signal from the first feedback circuit and to generate a power conversion control signal based on the first control signal. The power conversion control circuit is configured to generate a conversion signal based on the power conversion control signal, Equipped with, When the control terminal of the output control circuit is coupled to the first control voltage, the output control circuit is configured such that the first feedback circuit generates the first control signal, and the power conversion circuit generates a corresponding first output voltage and limits the output current to a first maximum output current based on the first control signal. When the control terminal of the output control circuit is coupled to the second control voltage, the output control circuit is configured such that the first feedback circuit generates the first control signal, and the power conversion circuit generates a second output voltage in response to the first control signal and limits the output current to a second maximum output current. A method for operating a power supply device in which the first control voltage is greater than the second control voltage, the first output voltage is greater than the second output voltage, and the first maximum output current is less than the second maximum output current.

11. The output control circuit further includes a pin detection circuit coupled to the first output terminal and the control terminal, and an adjustment control generation circuit coupled to the pin detection circuit and the first feedback circuit, The first feedback circuit further includes a first voltage divider circuit coupled to the first output terminal, a reference voltage signal, and the adjustment control generation circuit; a first current feedback reference setting circuit coupled to the first voltage divider circuit and the adjustment control generation circuit; a first comparison circuit coupled to the first voltage divider circuit; and a second comparison circuit coupled to the first current feedback reference setting circuit. The power supply device includes a second feedback circuit comprising: a second voltage divider circuit coupled to the first output terminal and the reference voltage signal; a second current feedback reference setting circuit coupled to the second voltage divider circuit; a third comparison circuit coupled to the second voltage divider circuit and the pin detection circuit; and a fourth comparison circuit coupled to the second current feedback reference setting circuit and the pin detection circuit. The aforementioned operating method is The first voltage divider circuit is configured to receive the first detection voltage signal from the first output terminal of the power conversion circuit and to generate a first voltage-divided detection voltage signal based on the reference voltage signal and the first detection voltage signal. The first current feedback reference setting circuit is configured to generate a first current feedback reference signal based on the reference voltage signal, The first comparison circuit is configured to generate a first voltage control signal based on the first voltage-divided detection voltage signal and the reference voltage signal, The second comparison circuit is configured to generate a first current control signal by comparing the first current feedback reference signal and the first detected current signal, The second voltage divider circuit is configured to receive a second detection voltage signal from the first output terminal of the power conversion circuit and to generate a second voltage-divided detection voltage signal based on the reference voltage signal and the second detection voltage signal. The second current feedback reference setting circuit is configured to generate a second current feedback reference signal based on the reference voltage signal, Equipped with, When the pin detection circuit provides a working voltage, the third comparison circuit is configured to generate a second voltage control signal based on the second divided detection voltage signal and the reference voltage signal, and the fourth comparison circuit is configured to generate a second current control signal based on the second current feedback reference signal and the second detection current signal. The coupling circuit is coupled with the first comparator circuit, the second comparator circuit, the third comparator circuit and the fourth comparator circuit, and generates the power conversion control signal correspondingly based on the first voltage control signal and the first current control signal, and / or based on the second voltage control signal and the second current control signal. When the control terminal is coupled to the second control voltage, the pin detection circuit, the adjustment control generation circuit, and the second feedback circuit do not operate; the first voltage divider circuit divides the first detection voltage signal to generate the first divided detection voltage signal having a first level; the first current feedback reference setting circuit generates a first current feedback reference signal of a third level based on the first reference divided voltage signal generated by the reference voltage signal; and the power conversion circuit generates the second output voltage and limits the output current to the second maximum output current. The operating method according to claim 10, wherein when the control terminal is coupled to the first control voltage, the pin detection circuit is configured to activate the adjustment control generation circuit, thereby changing one or more resistance values ​​coupled to the first feedback circuit, the first voltage divider circuit divides the first detection voltage signal to generate the first divided detection voltage signal having a second level, the first current feedback reference setting circuit generates the first current feedback reference signal of a fourth level based on the first reference voltage divider signal, the power conversion circuit generates the first output voltage and limits the output current to the first maximum output current, and the pin detection circuit provides the working voltage to the second feedback circuit so that the second voltage divider circuit divides the second detection voltage signal to generate the second divided detection voltage signal having a second level, and the second current feedback reference setting circuit generates the second current feedback reference signal of a fourth level based on the second reference voltage divider signal generated by dividing the reference voltage signal.

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