Power supply and operation method thereof

Abstract

The power supply comprises a shell, an output voltage control line, a power conversion circuit, an output control circuit, a current detection circuit, a feedback circuit, a coupling circuit and a power conversion control circuit. The power conversion circuit receives an input voltage. The feedback circuit receives the detection voltage signal and the detection current signal to correspondingly generate a control signal. The coupling circuit generates a power conversion control signal according to the control signal. The power conversion control circuit generates a conversion signal according to the power conversion control signal. When the output voltage control line is set to be conducted, the output control circuit sets the power conversion circuit to correspondingly generate a first output voltage. When the output voltage control line is set to be non-conductive, the output control circuit sets the power conversion circuit to correspondingly generate a second output voltage. The invention also relates to an operation method of the power supply.

Description

Power Supply and its Operation Method Technical Field

[0001] This disclosure relates to a power supply, and more particularly to a power supply with a settable output voltage. Background Technology

[0002] Currently, LED lighting fixtures on the market offer a variety of power specifications, such as LED strings connected in series and / or parallel in suitable configurations. Furthermore, LED lighting fixtures also come in various power specifications, such as 12V input voltage LED fixtures and 24V input voltage LED fixtures. To accommodate LED lighting fixtures with different power specifications, power supply manufacturers need to produce different models of power supplies. This not only increases the complexity of material preparation and manufacturing but also creates inventory management problems. Furthermore, lighting fixture manufacturers may damage their LED lighting fixtures by using incompatible power supplies. Summary of the Invention

[0003] Therefore, an effective power supply design method is needed to solve the above-mentioned technical problems.

[0004] One embodiment of this disclosure is a power supply for supplying power to a load. The power supply includes a power conversion circuit, an output control circuit, a current detection circuit, a first feedback circuit, a coupling circuit, a power conversion control circuit, a housing, and an output voltage control line. The power conversion circuit includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first and second input terminals are used to receive an input voltage, and the first and second output terminals are coupled to the load. The output control circuit is coupled to the first output terminal and has a control terminal. The current detection circuit includes a first terminal coupled to the second output terminal of the power conversion circuit and a second terminal coupled to the load. The first feedback circuit is coupled to the first output terminal of the power conversion circuit to receive a first detected voltage signal, coupled to the current detection circuit to receive a first detected current signal, and coupled to the output control circuit to generate a first control signal accordingly. The coupling circuit is 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 is coupled to the coupling circuit and the power conversion circuit, and generates a conversion signal based on the power conversion control signal. A housing accommodates at least one of the power conversion circuit, the output control circuit, the current detection circuit, the first feedback circuit, the coupling circuit, and the power conversion control circuit. An output voltage control line is coupled to the control terminal of the output control circuit and the first output terminal of the power conversion circuit, wherein at least a portion of the output voltage control line is exposed within the housing.

[0005] When the output voltage control line is set to be on, the control terminal of the output control circuit is coupled to the first output terminal of the power conversion circuit through the output voltage control line to receive a control voltage. The output control circuit sets the first feedback circuit to generate the first control signal according to the control voltage, and sets the power conversion circuit to generate a first output voltage accordingly with the first control signal. The power conversion circuit has a first maximum output current.

[0006] When the output voltage control line is set to non-conducting, the control terminal of the output control circuit is not coupled to the first output terminal of the power conversion circuit. The output control circuit sets the first feedback circuit to generate the first control signal and uses the first control signal to set the power conversion circuit to generate a second output voltage accordingly. The power conversion circuit has a second maximum output current. 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.

[0007] Another embodiment of this disclosure is a method for operating a power supply to supply power to a load. The power supply includes a housing, an output voltage control line, a power conversion circuit, an output control circuit, a current detection circuit, a first feedback circuit, a coupling circuit, and a power conversion control circuit. The housing accommodates at least one of the power conversion circuit, the output control circuit, the current detection circuit, the first feedback circuit, the coupling circuit, and the power conversion control circuit. The power conversion circuit includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first output terminal and the second output terminal are coupled to the load. The output control circuit is coupled to the load. The first output terminal has a control terminal. The current detection circuit includes a first terminal coupled to the second output terminal of the power conversion circuit and a second terminal coupled to the load. The first feedback circuit is coupled to the first output terminal of the power conversion circuit, the current detection circuit, and the output control circuit. The coupling circuit is coupled to the first feedback circuit. The power conversion control circuit is coupled to the coupling circuit and the power conversion circuit. The output voltage control line is coupled to the control terminal of the output control circuit and the first output terminal of the power conversion circuit. At least a portion of the output voltage control line is exposed outside the housing. The operating method includes: setting the first input terminal and the second input terminal of the power conversion circuit. The power conversion circuit receives an input voltage to supply power to a load at its first and second output terminals. A first feedback circuit receives a first detected voltage signal from the first output terminal of the power conversion circuit and a first detected current signal from the current detection circuit, thereby generating a first control signal. A coupling circuit receives the first control signal from the first feedback circuit and generates a power conversion control signal based on the first control signal. The power conversion control circuit generates a conversion signal based on the power conversion control signal. When the output voltage control line is set to conduct, the control terminal of the output control circuit communicates with the output voltage control line. The first output terminal of the power conversion circuit is coupled to receive a control voltage. The output control circuit configures the first feedback circuit to generate the first control signal, and uses the first control signal to configure the power conversion circuit to generate a first output voltage accordingly. The power conversion circuit also has a first maximum output current. When the output voltage control line is set to be non-conductive, the output control circuit configures the first feedback circuit to generate the first control signal, and uses the first control signal to configure the power conversion circuit to generate a second output voltage accordingly. The power conversion circuit also has a second maximum output current. 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.

[0008] The power supply disclosed herein can set the output voltage of the power supply by setting the conduction state of the output voltage control line exposed in the housing, which can increase the convenience and stability of installation and realize a variety of power output specifications. Attached Figure Description

[0009] This disclosure can be more fully understood by referring to the following detailed description of the embodiments with reference to the accompanying drawings:

[0010] Figure 1 is a block diagram of an embodiment of a power supply according to the present disclosure;

[0011] Figure 2A is a partial circuit block diagram of the power supply in Figure 1;

[0012] Figure 2B is a detailed circuit diagram of the power supply in Figure 2A;

[0013] Figure 3 is a block diagram of another embodiment of a power supply according to the present disclosure;

[0014] Figure 4A is a partial circuit diagram of the power supply in Figure 3;

[0015] Figure 4B is a detailed circuit diagram of the power supply in Figure 4A;

[0016] Figure 5 is a perspective view of an embodiment of the housing of a power supply;

[0017] Figure 6 is a block diagram of an embodiment in which the power supply of Figure 1 is mounted in the housing of Figure 5; and

[0018] Figure 7 is a block diagram of one embodiment of the power supply of Figure 3 installed in the housing of Figure 5.

[0019] Explanation of reference numerals in the attached figures:

[0020] 100,100': Power supply

[0021] 102: Power Conversion Circuit

[0022] 102a: First input terminal

[0023] 102b: Second input terminal

[0024] 102c: First output terminal

[0025] 102d: Second output terminal

[0026] 102X: Switch-mode power converter

[0027] 104, 104': Current detection circuit

[0028] 108, 108': Output control circuit

[0029] 108a: Pin detection circuit

[0030] 108b: Controlled generation circuit

[0031] 110': Feedback circuit

[0032] 110,110_1: First feedback circuit

[0033] 110_2: Second Feedback Circuit

[0034] 110a, 110_1a: First voltage divider circuit

[0035] 110b, 110_1b: First voltage regulator circuit

[0036] 110c, 110_1c: First comparator circuit

[0037] 110d, 110_1d: Second comparator circuit

[0038] 110_2a: Second voltage divider circuit

[0039] 110_2b: Second voltage regulator circuit

[0040] 110_2c: Third comparator circuit

[0041] 110_2d: Fourth Comparator Circuit

[0042] 111: Coupled Circuit

[0043] 112: Power Conversion Control Circuit

[0044] 114: Power Factor Correction Circuit

[0045] 114a: First AC input terminal

[0046] 114b: Second AC input terminal

[0047] 114c: First power factor correction output terminal

[0048] 114d: Second power factor correction output terminal

[0049] 200: Light Emitting Diode

[0050] 500: Outer casing

[0051] 520, 540: Connecting cables

[0052] 560: Output voltage control line

[0053] CW: Control Terminal

[0054] LED(+): Anode

[0055] LED(-): Cathode

[0056] V1: First voltage

[0057] V1a: First detection voltage signal

[0058] V1b: First detection current signal

[0059] V2a: Second detection voltage signal

[0060] V2b: Second detection current signal

[0061] Vin: Input voltage

[0062] Vout: Output voltage

[0063] Iout: Output current

[0064] I / P: Original voltage

[0065] CS1: First control signal

[0066] CS2: Second control signal

[0067] CS: Power conversion control signal

[0068] Sc: Conversion signal

[0069] C1: First capacitor

[0070] C2: Second capacitor

[0071] Ra: First trans-voltage resistance

[0072] Rb: Second transvoltage resistor

[0073] R1: First resistor

[0074] R2: Second resistor

[0075] R3: Third resistor

[0076] R4: Fourth resistor

[0077] R5: Fifth resistor

[0078] R6: Sixth resistor

[0079] R7: Seventh resistor

[0080] R8: Eighth resistor

[0081] R9: Ninth resistor

[0082] R10: Tenth resistor

[0083] R11: Eleventh resistor

[0084] R12: Twelfth resistor

[0085] R13: Thirteenth resistor

[0086] R14: The fourteenth resistor

[0087] R15: Fifteenth resistor

[0088] R16: Sixteenth resistor

[0089] R17: Seventeenth resistor

[0090] R18: Eighteenth resistor

[0091] R19: Nineteenth resistor

[0092] R20: Twentieth resistor

[0093] R21: Twenty-first resistor

[0094] R22: The twenty-second resistor

[0095] R23: The twenty-third resistor

[0096] R24: The twenty-fourth resistor

[0097] R25: The 25th resistor

[0098] R26: The twenty-sixth resistor

[0099] R27: The twenty-seventh resistor

[0100] R28: The twenty-eighth resistor

[0101] D1: First diode

[0102] D2: Second diode

[0103] D3: Third diode

[0104] D4: Fourth diode

[0105] D5: Fifth diode

[0106] Q1: First switch

[0107] Q2: Second switch

[0108] Q3: Third switch

[0109] Q4: Fourth Switch

[0110] C11: Third capacitor

[0111] C12: Fourth capacitor

[0112] C13: Fifth capacitor

[0113] C14: Sixth capacitor

[0114] C15: Seventh capacitor

[0115] C16: Eighth capacitor

[0116] C17: Ninth capacitor

[0117] VP1: First voltage divider

[0118] VP11: First voltage divider control signal

[0119] VP12: First shunt control signal

[0120] VP21: Second voltage divider control signal

[0121] VP22: Second shunt control signal

[0122] VP2: Second voltage divider

[0123] Vref: Reference voltage signal

[0124] Vref1: First reference voltage divider signal

[0125] Vref2: Second reference voltage divider signal

[0126] g1, g3, g4: Gate

[0127] d1, d3, d4: Drain electrodes

[0128] s1, s3, s4: Source poles

[0129] E: Emitter

[0130] B: Base

[0131] C: Collector

[0132] OP1: First operational amplifier

[0133] OP2: Second operational amplifier

[0134] OP3: Third Operational Amplifier

[0135] OP4: Fourth Operational Amplifier

[0136] +: Non-inverting input terminal

[0137] -: Inverting input terminal

[0138] Vs+: Positive power supply terminal

[0139] Vs-: Negative power supply terminal

[0140] Vo1: First amplification output terminal

[0141] Vo2: Second amplification output terminal

[0142] Vo3: Third Amplification Output Terminal

[0143] Vo4: Fourth Amplification Output Terminal

[0144] S11: First voltage control signal

[0145] S12: First current control signal

[0146] S21: Second voltage control signal

[0147] S22: Second current control signal

[0148] N1: First winding

[0149] N2: Second winding Detailed Implementation

[0150] The following detailed description of embodiments, in conjunction with the accompanying drawings, is provided. However, the specific embodiments described are only for explaining this disclosure and are not intended to limit this disclosure. The description of the structural operations is not intended to limit the order of their execution. Any structure that is recombined with elements and produces an apparatus with equivalent technical effects is within the scope of this disclosure.

[0151] Unless otherwise specified, the terms used throughout the specification and claims generally have their ordinary meaning in the context of the art, the disclosure, and the specific content.

[0152] As used in this article, "coupling" refers to two or more components making direct physical or electrical contact with each other, or making indirect physical or electrical contact with each other, or it can also refer to two or more components operating or moving with each other.

[0153] Please refer to Figure 1, which is a block diagram of an embodiment of a power supply 100 according to the present disclosure. The power supply 100 is used to supply power to a load (light-emitting diode 200). The power supply 100 is coupled to the anode (+) and cathode (-) of the light-emitting diode 200 to supply power to the light-emitting diode 200. The power supply 100 includes 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, the light-emitting diode 200 may be one or more light-emitting elements such as LEDs, and the power conversion circuit 102 may be an isolated or non-isolated DC-DC converter, a switch-mode power supply (SMPS) or an AC-DC converter, or a suitable power conversion architecture. The first feedback circuit 110 may include digital circuits, analog circuits, optocouplers and / or optoisolators, etc., to transmit feedback signals to the power conversion control circuit 112, so that the power conversion control circuit 112 can set the power conversion circuit 102 to generate an appropriate output voltage Vout and / or output current Iout.

[0154] In the following embodiments, the output voltage Vout of the power supply 100 is controlled at 12V or 24V by controlling the signal level of the control terminal CW of the output control circuit 108, so as to supply power to the LED 200 with a voltage of 12V or a voltage of 24V accordingly. In other embodiments, the output voltage Vout of the power supply 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.

[0155] In this embodiment, the power conversion circuit 102 can be configured to have two power output specifications: 12V and 24V. When the control terminal CW is coupled to the first control voltage (e.g., high voltage), the output control circuit 108 and the first feedback circuit 110 generate and transmit the first control signal CS1 to the coupling circuit 111 based on the first control voltage, the first detection voltage signal V1a, and the first detection current signal V1b. The coupling circuit 111 generates and transmits the power conversion control signal CS to the power conversion control circuit 112 based on the first control signal CS1. The power conversion control circuit 112 generates and transmits the conversion signal Sc to the power conversion circuit 102 based on the power conversion control signal CS, so that the power conversion circuit 102 performs power conversion operation on the power input signal (i.e., the input voltage Vin) according to the conversion signal Sc, so as to set the output voltage Vout to 24V.

[0156] When the control terminal CW is not coupled to the first control voltage (e.g., floating, grounded, or a suitable 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 and transmit the first control signal CS1 to the coupling circuit 111 based on the first detection voltage signal V1a and the first detection current signal V1b. The coupling circuit 111 generates and transmits the power conversion control signal CS to the power conversion control circuit 112 based on the first control signal CS1. The power conversion control circuit 112 generates and transmits the conversion signal Sc to the power conversion circuit 102 based on the power conversion control signal CS, so that the power conversion circuit 102 performs power conversion on the input voltage Vin according to the conversion signal Sc, so as to set the output voltage Vout to 12V.

[0157] The power conversion circuit 102 includes a first input terminal 102a, a second input terminal 102b, a first output terminal 102c, and a second output terminal 102d. The first input terminal 102a and the second input terminal 102b are used to receive an input voltage Vin. The first output terminal 102c and the second output terminal 102d are coupled to a light-emitting diode 200 to output a first voltage V1 to the light-emitting diode 200. The first output terminal 102c is coupled to the anode (LED(+)) of the light-emitting diode 200. The input voltage Vin can be either AC or DC.

[0158] In one embodiment, the power supply 100 further includes a power factor correction (PFC) circuit 114 and a first capacitor C1. The PFC circuit 114 includes a first AC input terminal 114a, a second AC input terminal 114b, a first PFC output terminal 114c, and a second PFC output terminal 114d. The first PFC output terminal 114c and the second PFC output terminal 114d are respectively coupled to the first input terminal 102a and the second input terminal 102b. The first AC input terminal 114a and the second AC input terminal 114b receive the original voltage I / P to generate an input voltage Vin to the first input terminal 102a and the second input terminal 102b. The first terminal of the first capacitor C1 is coupled to the first PFC output terminal 114c and the first input terminal 102a, and the second terminal of the first capacitor C1 is coupled to the second PFC output terminal 114d and the second input terminal 102b. Therefore, with the above circuit structure, the power conversion circuit 102 receives the input voltage Vin. In one embodiment, the original voltage I / P may be an AC voltage.

[0159] In one embodiment, the power supply 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 original voltage I / P.

[0160] In this embodiment, the power supply 100 further includes a current detection circuit 104, which is coupled to the second output terminal 102d and the cathode LED (-) of the light-emitting diode 200, and coupled to the first output terminal 102c and the anode LED (+) of the light-emitting diode 200 through the second capacitor C2. The current detection circuit 104 includes a first trans-voltage resistor Ra, the first end of which is coupled to the second output terminal 102d, and the second end of which is coupled to the cathode LED (-) of the light-emitting diode 200. Since the trans-voltage across the first trans-voltage resistor Ra is positively correlated with the current flowing through the first trans-voltage resistor Ra, the voltage value of the first trans-voltage resistor Ra can be used as the first current detection signal V1b to detect the current value flowing through the current detection circuit 104.

[0161] The output control circuit 108 is coupled to the first output terminal 102c and the first feedback circuit 110. In one embodiment, if the control terminal CW of the output control circuit 108 is to be coupled to the first control voltage so that the power supply 100 generates a 24V output voltage Vout, the control terminal CW can be coupled to the first output terminal 102c to operate the output control circuit 108. If the control terminal CW of the output control circuit 108 is not coupled to the first control voltage so that the power supply 100 generates a 12V output voltage Vout, the control terminal CW can be floated, grounded, or coupled to a suitable voltage level such as a second control voltage lower than the first control voltage to prevent the output control circuit 108 from operating.

[0162] The first terminal of the first feedback circuit 110 is coupled to the first output terminal 102c to receive the first detection voltage signal V1a. The second terminal of the first feedback circuit 110 is coupled to the first trans-voltage resistor Ra of the current detection circuit 104 to receive the first detection current signal V1b. The first feedback circuit 110 is also coupled to the output control circuit 108. The first feedback circuit 110 generates a first control signal CS1 according to the first detection voltage signal V1a and the first detection current signal V1b, and according to the operating state of the first feedback circuit 110.

[0163] In this embodiment, the power supply 100 further includes a second capacitor C2 to provide a stable output voltage Vout. The two ends of the second capacitor C2 are respectively coupled to the anode LED(+) and cathode LED(-) of the light-emitting diode 200.

[0164] The coupling circuit 111 is coupled to the first feedback circuit 110 to receive the first control signal CS1 and to generate a power conversion control signal CS based on the first control signal CS1.

[0165] 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.

[0166] 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 into an output voltage Vout of a suitable voltage level according to the conversion signal Sc generated by the power conversion control circuit 112.

[0167] Please refer to Figure 2A, which is a partial circuit block diagram of the power supply 100 in Figure 1. For ease of explanation, Figure 2A only shows the power conversion circuit 102, the output control circuit 108, the first feedback circuit 110, and the power conversion control circuit 112.

[0168] As shown in the embodiment of Figure 2A, the output control circuit 108 includes a control terminal CW, a pin detection circuit 108a, and a regulation generation circuit 108b. The pin detection circuit 108a sets the operating state of the regulation generation circuit 108b according to the voltage of the control terminal CW. When the control terminal CW is coupled to a first control voltage (e.g., a high voltage), the pin detection circuit 108a sets the regulation generation circuit 108b to operate; when the control terminal CW is not coupled to the first control voltage (e.g., floating, grounded, or a suitable voltage level such as a second control voltage lower than the first control voltage), the pin detection circuit 108a sets the regulation generation circuit 108b to not operate.

[0169] As shown in the embodiment of Figure 2A, the first feedback circuit 110 includes a first voltage divider circuit 110a, a first voltage regulator 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 functions, while the first voltage regulator circuit 110b and the second comparator circuit 110d provide current feedback control functions. The first voltage divider circuit 110a is coupled to the first output terminal 102c to receive the first detected voltage signal V1a, and is also coupled to the control generation circuit 108b. When the control generation circuit 108b is not operating, the first voltage divider circuit 110a generates a first voltage divider control signal VP11 with a first level based on the first detected voltage signal V1a; when the control generation circuit 108b is operating, the first voltage divider circuit 110a generates the first voltage divider control signal VP11 with a second level based on the first detected voltage signal V1a. In one embodiment, the first voltage divider control signal VP11 at the first level corresponds to an output voltage Vout of 12V for the power conversion circuit 102, and the first voltage divider control signal VP11 at the second level corresponds to an output voltage Vout of 24V for the power conversion circuit 102.

[0170] In one embodiment, the power supply 100 can be configured to provide two power specifications: a 12V output voltage and a maximum output current of 5A (maximum output power of 60W), and a 24V output voltage and a maximum output current of 2.5A (maximum output power of 60W). A first voltage regulator circuit 110b is coupled to a control generation circuit 108b. When the control generation circuit 108b is not operating, the third-level first shunt control signal VP12 generated by the first voltage regulator circuit 110b corresponds to a maximum output current Iout of 5A for the power conversion circuit 102. When the control generation circuit 108b is operating, the fourth-level first shunt control signal VP12 generated by the first voltage regulator circuit 110b corresponds to a maximum output current Iout of 2.5A for the power conversion circuit 102.

[0171] The first comparator circuit 110c is coupled to the first voltage divider circuit 110a and is used to compare the first voltage divider control signal VP11 and the reference voltage signal Vref to generate a first voltage control signal S11 having a fifth level or a sixth level, respectively. In one embodiment, the first voltage control signal S11 with the fifth level corresponds to an output voltage Vout of 12V for the power conversion circuit 102, and the first voltage control signal S11 with the sixth level corresponds to an output voltage Vout of 24V for the power conversion circuit 102.

[0172] The second comparator circuit 110d is coupled to the first voltage regulator circuit 110b and is used to compare the first shunt control signal VP12 and the first current detection signal V1b to generate a first current control signal S12 having a seventh level or an eighth level, respectively. In one embodiment, the seventh-level first current control signal S12 corresponds to a maximum output current Iout of 5A for the power conversion circuit 102, and the eighth-level first current control signal S12 corresponds to a maximum output current Iout of 2.5A for the power conversion circuit 102. In this embodiment, the first control signal CS1 consists of a first voltage control signal S11 and a first current control signal S12.

[0173] The first to eighth levels mentioned above can be set to the same or different signal levels, respectively.

[0174] The coupling circuit 111 is coupled to the first comparator circuit 110c and the second comparator circuit 110d, and generates a power conversion control signal CS accordingly based on the first control signal CS1.

[0175] Please refer to Figure 2B, which is a detailed circuit architecture diagram of the power supply 100 of Figure 2A. As shown in the embodiment of 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 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 can be N-channel MOSFETs, the second switch Q2 can be a PNP bipolar junction transistor (BJT), and the first diode D1 can be a Zener diode.

[0176] The first diode D1, the first resistor R1, the second resistor R2, and the third capacitor C11 are used to convert the voltage at the control terminal CW to a suitable voltage level, causing the first switch Q1 and the second switch Q2 to be in a conducting or non-conducting state. The cathode LED (-) of the first diode D1 is coupled to the control terminal CW. The first end of the first resistor R1 is coupled to the anode LED (+) of the first diode D1. The first end of the second resistor R2 is coupled to the second end of the first resistor R1, and the second end of the second resistor R2 is grounded. The first end of the third capacitor C11 is coupled to the second end of the first resistor R1, the first end of the second resistor R2, and the gate g1 of the first switch Q1, and the second end of the third capacitor C11 is grounded. The source s1 of the first switch Q1 is grounded. The first end 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 first end of the fourth resistor R4 is coupled to the second end of the third resistor R3, and the second end of the fourth resistor R4 is coupled to the drain d1 of the first switch Q1. The base B of the second switch Q2 is coupled to the second terminal of the third resistor R3 and the first terminal of the fourth resistor R4. The emitter E of the second switch Q2 is coupled to the first output terminal 102c of the power conversion circuit 102 to receive the first voltage V1. The first terminal of the fifth resistor R5 is coupled to the collector C of the second switch Q2. The first terminal of the sixth resistor R6 is coupled to the second terminal of the fifth resistor R5, and the second terminal of the sixth resistor R6 is grounded.

[0177] The gate g3 of the third switch Q3 is coupled to the second terminal of the fifth resistor R5 and the first terminal of the sixth resistor R6, and the source s3 of the third switch Q3 is grounded. The first terminal of the seventh resistor R7 is coupled to the first feedback circuit 110, and the second terminal of the seventh resistor R7 is coupled to the drain d3 of the third switch Q3. The gate g4 of the fourth switch Q4 is coupled 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, and the source s4 of the fourth switch Q4 is grounded. The first terminal of the eighth resistor R8 is coupled to the first feedback circuit 110, and the second terminal of the eighth resistor R8 is coupled to the drain d4 of the fourth switch Q4.

[0178] 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, causing the third switch Q3 and the fourth switch Q4 of the regulation generation circuit 108b to turn on. When the control terminal CW is not coupled to the first control voltage (e.g., floating, grounded, or a suitable 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 not turned on, causing the third switch Q3 and the fourth switch Q4 of the regulation generation circuit 108b to turn off.

[0179] 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 voltage regulator 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 can employ a suitable signal transmission method, such as electrical signals, optical signals, or magnetic signals, to transmit the first control signal CS1 of the first feedback circuit 110 to the power conversion control circuit 112. In one embodiment, the coupling circuit 111 includes a photodiode and a photodetector. The photodiode is coupled to a first comparator circuit 110c and a second comparator circuit 110d to convert a first control signal CS1 into an optical signal. The photodetector receives the optical signal and converts it into a power conversion control signal CS to be transmitted to the power conversion control circuit 112.

[0180] The first terminal of the ninth resistor R9 receives the first detection voltage signal V1a. The first terminal of the tenth resistor R10 is coupled to the second terminal of the ninth resistor R9 to receive the reference voltage signal Vref. The first terminal of the eleventh resistor R11 is coupled to the second terminal of the tenth resistor R10, and the second terminal of the eleventh resistor R11 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 coupled to the second terminal of the twelfth resistor R12, and the second terminal of the thirteenth resistor R13 is grounded. The non-inverting input (+) of 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 to receive the reference voltage signal Vref. The inverting input (-) of the first operational amplifier OP1 is coupled to the second terminal of the twelfth resistor R12 and the first terminal of the thirteenth resistor R13. The positive power supply terminal Vs+ of the first operational amplifier OP1 is coupled to the first output terminal 102c of the power conversion circuit 102, and the negative power supply terminal Vs- of the first operational amplifier OP1 is grounded. The first terminal of the fourteenth resistor R14 is coupled to the inverting input (-) of the first operational amplifier OP1. The first terminal of the fourth capacitor C12 is coupled to the second terminal of the fourteenth resistor R14, and the second terminal of the fourth capacitor C12 is coupled to the first amplified output terminal Vo1 of the first operational amplifier OP1. The first terminal of the fifteenth resistor R15 is coupled to the second terminal of the fourth capacitor C12 and the first amplified output terminal Vo1 of the first operational amplifier OP1. The first terminal of the second diode D2 is coupled to the second terminal of the fifteenth resistor R15. The first terminal of the sixteenth resistor R16 is coupled to the second terminal of the tenth resistor R10 and the first terminal of the eleventh resistor R11. The first terminal of the fifth capacitor C13 is coupled to the second terminal of the sixteenth resistor R16, and the second terminal of the fifth capacitor C13 is grounded. The non-inverting input (+) of the second operational amplifier OP2 is coupled to the second terminal of the sixteenth resistor R16 and the first terminal of the fifth capacitor C13. The inverting input (-) of the second operational amplifier OP2 receives the first detection current signal V1b. The positive power supply terminal Vs+ of the second operational amplifier OP2 is coupled to the first output terminal 102c of the power conversion circuit 102, and the negative power supply terminal Vs- is grounded. The first terminal of the seventeenth resistor R17 is coupled to the inverting input (-) of the second operational amplifier OP2. The first terminal of the sixth capacitor C14 is coupled to the second terminal of the seventeenth resistor R17, and the second terminal of the sixth capacitor C14 is coupled to the second amplified output terminal Vo2 of the second operational amplifier OP2. The first terminal of the eighteenth resistor R18 is coupled to the second terminal of the sixth capacitor C14 and the second amplified output terminal Vo2 of the second operational amplifier OP2. The first terminal of the third diode D3 is coupled to the second terminal of the eighteenth resistor R18, and the second terminal of the third diode D3 is coupled to the second terminal of the second diode D2.

[0181] In one embodiment, the reference voltage signal Vref can be a reference voltage signal generated by a constant voltage source, for example, a voltage of 2.5V. The reference voltage signal Vref is divided by the tenth resistor R10 and the eleventh resistor R11 to generate a first reference voltage divider signal Vref1, and the voltage of the first reference voltage divider signal Vref1 is...

[0182] The first terminal of the power conversion control circuit 112 is coupled to the coupling circuit 111 to receive the power conversion control signal CS, and to generate a conversion signal Sc based on the power conversion control signal CS, thereby controlling the power conversion circuit 102 to generate the required output voltage Vout.

[0183] 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 a primary winding or primary coil, and the second winding N2 is a secondary winding or secondary coil.

[0184] The first and second terminals (i.e., first input terminal 102a and second input terminal 102b) of the switch-mode power converter 102X receive the input voltage Vin. The third and fourth terminals of the switch-mode power converter 102X are coupled to the first and second terminals of the first winding N1. The first terminal (i.e., the first output terminal 102c) of the second winding N2 is coupled to the anode (LED) (+) of the light-emitting diode 200. The second terminal (i.e., the second output terminal 102d) of the second winding N2 is coupled to the cathode (LED) (-) of the light-emitting diode 200.

[0185] Therefore, when the control terminal CW is not coupled to the first control voltage (e.g., high voltage), the pin detection circuit 108a and the regulation generation circuit 108b do not operate. The first comparison circuit 110c generates a first voltage control signal S11 based on the first voltage divider control signal VP11 and the reference voltage signal Vref. The second comparison circuit 110d compares the first shunt control signal VP12 and the first current detection signal V1b to generate a first current control signal S12. The first control signal CS1 includes the first voltage control signal S11 and the first current control signal S12, which are used as feedback signals for voltage feedback control and current feedback control, respectively. The coupling circuit 111 generates a power conversion control signal CS for the power conversion control circuit 112 based on the first control signal CS1. The power conversion control circuit 112 generates a conversion signal Sc for the power conversion circuit 102 based on the power conversion control signal CS, causing the power conversion circuit 102 to generate a 12V output voltage Vout based on the conversion signal Sc, and controlling the maximum output current Iout to be 5A.

[0186] 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 not turned on, causing the pin detection circuit 108a to not operate, and correspondingly controlling the third switch Q3 and the fourth switch Q4 of the control generation circuit 108b to not turn on. The first detection voltage signal V1a is divided by the twelfth resistor R12 and the thirteenth resistor R13 and applied to the inverting input terminal (-) of the first operational amplifier OP1 to generate the first voltage divider control signal VP11 (i.e., voltage divider) corresponding to an output voltage Vout of 12V. The first operational amplifier OP1 compares the first voltage divider control signal VP11 and the reference voltage signal Vref to generate a first voltage control signal S11 corresponding to an output voltage Vout of 12V. The sixteenth resistor R16 receives the first reference voltage divider signal Vref1 to generate a first shunt control signal VP12. The second operational amplifier OP2 compares the first shunt control signal VP12 and the first current detection signal V1b to generate a first current control signal S12.

[0187] When the control terminal CW is coupled to the first control voltage (e.g., high voltage), the first control voltage is greater than the breakdown voltage of the first diode D1, causing the first diode D1 to conduct. 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 voltage divider VP1. The first voltage divider VP1 is greater than the threshold voltage of the first switch Q1, causing the first switch Q1 and the second switch Q2 to conduct, thus enabling the pin detection circuit 108a to operate. After the pin detection circuit 108a operates, the first voltage V1 is subtracted from the voltage drop of the second switch Q2 and then divided by the fifth resistor R5 and the sixth resistor R6 to become the second voltage divider VP2. The second voltage divider VP2 is greater than the threshold voltage of the third switch Q3 and the fourth switch Q4, causing the third switch Q3 and the fourth switch Q4 to conduct, thus enabling the control generation circuit 108b to operate. After the third switch Q3 is turned on, the seventh resistor R7 is connected in parallel with the thirteenth resistor R13. The resistance value of the seventh resistor R7 connected in parallel with the thirteenth resistor R13 decreases, causing the voltage at the inverting input terminal (-) of the first operational amplifier OP1 to decrease. Since the voltage at the non-inverting input terminal (+) of the first operational amplifier OP1 is still the reference voltage signal Vref, the first voltage control signal S11 generated by the first operational amplifier OP1, the first control signal CS1, 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 will cause the power conversion circuit 102 to correspondingly increase the output voltage Vout according to the conversion signal Sc, causing the first detection voltage signal V1a to rise to the first voltage divider control signal VP11 (i.e., voltage divider). The output voltage Vout is equal to the reference voltage signal Vref. In this embodiment, the output voltage Vout is 24V. Similarly, after the fourth switch Q4 is turned on, the eighth resistor R8 is connected in parallel with the eleventh resistor R11. The resistance value of the eighth resistor R8 connected in parallel with the eleventh resistor R11 decreases, causing the voltage at the non-inverting input (+) terminal of the second operational amplifier OP2 to decrease. The first current control signal S12 generated by the second operational amplifier OP2, the first control signal CS1, 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 will cause the power conversion circuit 102 to correspondingly reduce the output current Iout according to the conversion signal Sc, so that the first detection current signal V1b decreases to be equal to the first shunt control signal VP12. In this embodiment, the maximum output current Iout is 2.5A.

[0188] As shown in the embodiment of Figure 2B, when the control terminal CW is coupled to the first control voltage, the first diode D1 is turned on. The first voltage V1, after deducting the voltage across the first diode D1, is then divided by the first resistor R1 and the second resistor R2 and applied to the gate g1 of the first switch Q1 to generate the first voltage VP1 to turn on the first switch Q1.

[0189] When the first voltage divider VP1 is greater than the threshold voltage of the first switch Q1 (e.g., 3.5V), the first switch Q1 is turned on. The first voltage V1 is divided by the third resistor R3 and the fourth resistor R4 and applied to the base B of the second switch Q2, causing the second switch Q2 to turn on. This allows the first voltage V1 to be transmitted to the collector C of the second switch Q2 (since the voltage drop of the second switch Q2 is much smaller than the first voltage V1, it 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 and applied to the gate g3 of the third switch Q3 and the gate g4 of the fourth switch Q4 to generate the second voltage divider VP2 (i.e., the detection signal). In one embodiment, the second voltage divider VP2 is approximately

[0190] When the second voltage divider VP2 is greater than the threshold voltage (e.g., 3.5V) of the third switch Q3 and the fourth switch Q4, the third switch Q3 and the fourth switch Q4 are turned on. After 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 of the inverting input terminal (-) of the first operational amplifier OP1. The first detection voltage signal V1a is generated at the inverting input terminal (-) of the first operational amplifier OP1 through the voltage divider of the twelfth resistor R12, the seventh resistor R7 and the thirteenth resistor R13 to form a first voltage divider control signal VP11 with an output voltage Vout of 24V. The first operational amplifier OP1 compares the first voltage divider control signal VP11 with the 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 to set the voltage level of the non-inverting input (+) 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 and applied to the non-inverting input (+) of the second operational amplifier OP2 to generate a first shunt control signal VP12 with a maximum output current Iout of 2.5A. The second operational amplifier OP2 compares the first shunt control signal VP12 with the first detected current signal V1b to generate a first current control signal S12 with a maximum output current Iout of 2.5A. The first voltage control signal S11 and the first current control signal S12 form an output voltage... A first control signal CS1 with Vout of 24V and maximum output current Iout of 2.5A is given to the coupling circuit 111. The coupling circuit 111 generates a power conversion control signal CS with an output voltage Vout of 24V and a maximum output current Iout of 2.5A based on the first control signal CS1 and gives it to the power conversion control circuit 112. The power conversion control circuit 112 generates a conversion signal Sc with an output voltage Vout of 24V and a maximum output current Iout of 2.5A based on the power conversion control signal CS and gives it to the power conversion circuit 102. The power conversion circuit 102 then generates an output voltage Vout of 24V based on the input voltage Vin and controls the maximum output current Iout to be 2.5A based on the conversion signal Sc.

[0191] Therefore, through the output control circuit 108 and single-loop control circuit (i.e., the first feedback circuit 110) of the power supply 100 in Figures 1 and 2A-2B, the control terminal CW can be selectively coupled to a first control voltage (e.g., a high voltage) to control the output voltage Vout of the power supply 100 to 12V or 24V, so that the power supply 100 can achieve the required power output specification of 12V or 24V according to the settings.

[0192] Figure 3 is a block diagram of another embodiment of the power supply according to the present disclosure. Referring to Figures 1 and 3, the power supply 100 of Figure 1 and the power supply 100' of Figure 3 have partially similar circuit structures. 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. The technical content related to Figure 1 will not be described again.

[0193] In the following embodiments, the output voltage Vout of the power supply 100' is controlled at 12V or 24V by controlling the signal level of the control terminal CW of the output control circuit 108', thereby supplying power to the LED 200 at either 12V or 24V. In other embodiments, the output voltage Vout of the power supply 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'.

[0194] In this embodiment, the power conversion circuit 102 can be configured to have two 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' sets the second feedback circuit 110_2 to operate accordingly. The first feedback circuit 110_1 and the second feedback circuit 110_2 of the output control circuit 108' and feedback circuit 110' generate and transmit the first control signal CS1 and the second control signal CS2 to the coupling circuit 111 based on the first detection voltage signal V1a, the first detection current signal V1b, the second detection voltage signal V2a, and the second detection current signal V2b. The coupling circuit 111 generates and transmits the power conversion control signal CS to the power conversion control circuit 112 based on the first control signal CS1 and the second control signal CS2. The power conversion control circuit 112 generates and transmits the conversion signal Sc to the power conversion circuit 102 based on the power conversion control signal CS, so that the power conversion circuit 102 performs power conversion operation on the power input signal (i.e., input voltage Vin) according to the conversion signal Sc, so as to set the output voltage Vout to 24V and control the maximum output current to 4.1A, so that the maximum output power is set to 100W.

[0195] When the control terminal CW is not coupled to the first control voltage (e.g., grounded or floating), the output control circuit 108' sets the second feedback circuit 110_2 to not operate accordingly. The first feedback circuit 110_1 of the output control circuit 108' and the feedback circuit 110' generates and transmits a first control signal CS1 to the coupling circuit 111 based on the first detected voltage signal V1a and the first detected current signal V1b. The coupling circuit 111 generates and transmits a power conversion control signal CS to the power conversion control circuit 112 based on the first control signal CS1. The power conversion control circuit 112 generates and transmits a conversion signal Sc to the power conversion circuit 102 based on the power conversion control signal CS, so that the power conversion circuit 102 performs power conversion on the input voltage Vin according to the conversion signal Sc, so as to set the output voltage Vout to 12V and control the maximum output current to 5A, so that the maximum output power is set to 60W.

[0196] As shown in Figure 3, the power supply 100' includes a current detection circuit 104'.

[0197] The current detection circuit 104' includes a first trans-voltage resistor Ra and a second trans-voltage resistor Rb. The first end of the second trans-voltage resistor Rb is coupled to the second end of the first trans-voltage resistor Ra, and the second end of the second trans-voltage resistor Rb is coupled to the cathode (LED-) of the light-emitting diode 200. It is also coupled to the first output terminal 102c and the anode (LED-) of the light-emitting diode 200 through the second capacitor C2. Since the voltages of the first trans-voltage resistor Ra and the second trans-voltage resistor Rb are positively correlated with the currents flowing through them, the voltage values ​​of the first trans-voltage resistor Ra and the second trans-voltage resistor Rb can be used as the first detection current signal V1b and the second detection current signal V2b, respectively, to detect the current flowing through the current detection circuit 104'.

[0198] As shown in Figure 3, the power supply 100' includes an output control circuit 108', which is coupled to a first output terminal 102c and a feedback circuit 110'.

[0199] As shown in Figure 3, the power supply 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 that of 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 described again.

[0200] As shown in the embodiment of Figure 3, the first terminal of the second feedback circuit 110_2 is coupled to the first output terminal 102c to receive the second detection voltage signal V2a, and the second terminal of the second feedback circuit 110_2 is coupled to the current detection circuit 104' and the cathode LED(-) of the light-emitting diode 200 to receive the second detection current signal V2b. The second feedback circuit 110_2 is also coupled to the output control circuit 108' to selectively receive the first voltage V1. The second feedback circuit 110_2 generates a second control signal CS2 according to the second detection voltage signal V2a, the second detection current signal V2b, and the setting of the output control circuit 108' (i.e., whether the first voltage V1 is received). 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, where the second detection voltage signal V2a is equal to or close to the voltage value of the first voltage V1, and the second detection current signal V2b is the voltage value at the second trans-voltage resistor Rb.

[0201] 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 to generate a power conversion control signal CS based on the first control signal CS1 and the second control signal CS2.

[0202] 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 into an output voltage Vout of a suitable voltage level based on the conversion signal Sc generated by the power conversion control circuit 112.

[0203] Figure 4A is a partial circuit diagram of the power supply 100' in Figure 3. For ease of explanation, Figure 4A only shows 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. Since 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, the first feedback circuit 110 in Figure 2A (which includes a first voltage divider circuit 110a, a first voltage regulator circuit 110b, a first comparator circuit 110c, and a second comparator circuit 110d) and the first feedback circuit 110_1 in Figure 4A (which includes a first voltage divider circuit 110_1a, a first voltage regulator circuit 110_1b, a first comparator circuit 110_1c, and a second comparator circuit 110_1d) have the same or similar circuit structures, the technical content related to Figure 2A will not be described again.

[0204] As shown in Figure 4A, when the control terminal CW is coupled to the first control voltage (e.g., high voltage), the pin detection circuit 108a sets the regulation generation circuit 108b to operate and provides the first voltage V1 to the second feedback circuit 110_2 as the working voltage, so that the second feedback circuit 110_2 receives the first voltage V1 and operates; when the control terminal CW is not coupled to the first control voltage (e.g., floating, grounded, or a suitable voltage level such as a second control voltage lower than the first control voltage), the pin detection circuit 108a sets the regulation generation circuit 108b to not operate and does not provide the first voltage V1 to the second feedback circuit 110_2 as the working voltage, so that the second feedback circuit 110_2 does not receive the first voltage V1 and does not operate.

[0205] As shown in Figure 4A, the power supply 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 voltage regulator 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 functions, while the second voltage regulator circuit 110_2b and the fourth comparator circuit 110_2d provide current feedback control functions. The second voltage divider circuit 110_2a is coupled to the first output terminal 102c to receive a second detection voltage signal V2a, and the second voltage divider circuit 110_2a generates a second voltage divider control signal VP21 based on the second detection voltage signal V2a. The second voltage regulator 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 uses the divided voltage of the second detection voltage signal V2a as the second shunt control signal VP22. The third comparator circuit 110_2c is coupled to the second voltage divider circuit 110_2a and the pin detection circuit 108a. When the pin detection circuit 108a does not provide the first voltage V1 to the third comparator circuit 110_2c, the third comparator circuit 110_2c does not operate; when the pin detection circuit 108a provides the first voltage V1 to the third comparator circuit 110_2c, the third comparator circuit 110_2c operates and is used to generate the second voltage control signal S21 based on the second voltage divider control signal VP21. The fourth comparator circuit 110_2d is coupled to the second voltage regulator circuit 110_2b and the pin detection circuit 108a. When the pin detection circuit 108a does not provide the first voltage V1 to the fourth comparator circuit 110_2d, the fourth comparator circuit 110_2d does not operate; when the pin detection circuit 108a provides the first voltage V1 to the fourth comparator circuit 110_2d, the fourth comparator circuit 110_2d operates and is used to generate a second current control signal S22 based on the second shunt control signal VP22 and the second detected current signal V2b. In one embodiment, the second control signal S22 consists of the second voltage control signal S21 and the second current control signal S22. In one embodiment, the second voltage divider control signal VP21 and the second voltage control signal S21 correspond to an output voltage Vout of 24V for the power conversion circuit 102, and the second shunt control signal VP22 and the second current control signal S22 correspond to an output current Iout of 4.1A for the power conversion circuit 102.

[0206] 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, so as to generate a power conversion control signal CS according to the first control signal CS1 and the second control signal CS2.

[0207] Please refer to Figure 4B, which is a detailed circuit architecture diagram of the power supply 100' in Figure 4A. Please also refer to Figures 2B and 4B. Since the pin detection circuit 108a and the regulation generation circuit 108b in Figures 2B and 4B have the same or similar circuit structures, the technical content related to Figure 2B will not be described again.

[0208] Please refer to Figures 2B and 4B simultaneously. Since the first voltage divider circuit 110_1a, the first voltage regulator circuit 110_1b, the first comparator circuit 110_1c, and the second comparator circuit 110_1d in Figure 4B are the same as or similar to the first voltage divider circuit 110a, the first voltage regulator circuit 110b, the first comparator circuit 110c, and the second comparator circuit 110d in Figure 2B, the technical content related to Figure 2B will not be repeated.

[0209] As shown in the embodiment of Figure 4B, the second voltage divider circuit 110_2a includes a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, and a twenty-third resistor R23; the second voltage regulator circuit 110_2b includes an eighth capacitor C16 and a twenty-sixth resistor R26; the third comparator circuit 110_2c includes a fourth diode D4, a seventh capacitor C15, a twenty-fourth resistor R24, a twenty-fifth resistor R25, and a third operational amplifier OP3; and the fourth comparator circuit 110_2d includes a fifth diode D5, a ninth capacitor C17, a twenty-seventh resistor R27, a twenty-eighth resistor R28, and a fourth operational amplifier OP4. The coupling circuit 111 can employ a suitable signal transmission method, such as electrical signals, optical signals, or magnetic signals, 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 and a photodetector. The photodiode is coupled to a first comparator circuit 110_1c, a second comparator circuit 110_1d, a third comparator circuit 110_2c, and a fourth comparator circuit 110_2d to convert a first control signal CS1 and a second control signal CS2 into optical signals. The photodetector receives the optical signals and converts them into a power conversion control signal CS to be transmitted to the power conversion control circuit 112.

[0210] The first terminal of the nineteenth resistor R19 receives the second detection voltage signal V2a. The first terminal of the twentieth resistor R20 is coupled to the second terminal of the nineteenth resistor R19 to receive the reference voltage signal Vref. The first terminal of the twenty-first resistor R21 is coupled to the second terminal of the twentieth resistor R20, and the second terminal of the twenty-first resistor R21 is grounded. The first terminal of the twenty-second resistor R22 receives the second detection voltage signal V2a. The first terminal of the twenty-third resistor R23 is coupled to the second terminal of the twenty-second resistor R22, and the second terminal of the twenty-third resistor R23 is grounded. The non-inverting input (+) of the third operational amplifier OP3 is coupled to the second terminal of the nineteenth resistor R19 and the first terminal of the twentieth resistor R20 to receive the reference voltage signal Vref. The inverting input (-) of the third operational amplifier OP3 is coupled to the second terminal of the twenty-second resistor R22 and the first terminal of the twenty-third resistor R23. The positive power supply terminal Vs+ of the third operational amplifier OP3 is coupled to the collector C of the second switch Q2, and the negative power supply terminal Vs- of the third operational amplifier OP3 is grounded. The first terminal of the twenty-fourth resistor R24 ​​is coupled to the inverting input (-) of the third operational amplifier OP3. The first terminal of the seventh capacitor C15 is coupled to the second terminal of the twenty-fourth resistor R24, and the second terminal of the seventh capacitor C15 is coupled to the third output terminal Vo3 of the third operational amplifier OP3. The first terminal of the twenty-fifth resistor R25 is coupled to the second terminal of the seventh capacitor C15 and the third output terminal Vo3 of the third operational amplifier OP3. The first terminal of the fourth diode D4 is coupled to the second terminal of the twenty-fifth resistor R25. The first terminal of the twenty-sixth resistor R26 is coupled to the second terminal of the twenty-ninth resistor R20 and the first terminal of the twenty-first resistor R21. The first terminal of the eighth capacitor C16 is coupled to the second terminal of the twenty-sixth resistor R26, and the second terminal of the eighth capacitor C16 is grounded. The non-inverting input (+) of the fourth operational amplifier OP4 is coupled to the second terminal of the twenty-sixth resistor R26 and the first terminal of the eighth capacitor C16. The inverting input (-) of the fourth operational amplifier OP4 receives the second detection current signal V2b. The positive power supply terminal Vs+ of the fourth operational amplifier OP4 is coupled to the positive power supply terminal Vs+ of the third operational amplifier OP3 and the collector C of the second switch Q2. The negative power supply terminal Vs- of the fourth operational amplifier OP4 is grounded. The first terminal of the twenty-seventh resistor R27 is coupled to the inverting input (-) of the fourth operational amplifier OP4. The first terminal of the ninth capacitor C17 is coupled to the second terminal of the twenty-seventh resistor R27, and the second terminal of the ninth capacitor C17 is coupled to the fourth amplified output terminal Vo4 of the fourth operational amplifier OP4. The first terminal of the twenty-eighth resistor R28 is coupled to the second terminal of the ninth capacitor C17 and the fourth amplified output terminal Vo4 of the fourth operational amplifier OP4. The first terminal of the fifth diode D5 is coupled to the second terminal of the twenty-eighth resistor R28, and the second terminal of the fifth diode D5 is coupled to the second terminal of the fourth diode D4.

[0211] In one embodiment, the thirteenth resistor R13 is greater than the twenty-third resistor R23, and the resistance value of the twenty-third resistor R23 is substantially equal to the resistance value of the seventh resistor R7 in parallel with the thirteenth resistor R13. The eleventh resistor R11 is greater than the twenty-first resistor R21, and the resistance value of the twenty-first resistor R21 is substantially equal to the resistance value of the eighth resistor R8 in parallel with the eleventh resistor R11.

[0212] In one embodiment, the reference voltage signal Vref is divided by the twentieth resistor R20 and the eleventh resistor R21 to generate a second reference voltage divider signal Vref2, and the voltage of the second reference voltage divider signal Vref2 is... Furthermore, the second reference voltage divider signal Vref2 is essentially equal to the first reference voltage divider signal.

[0213] Therefore, when the control terminal CW is not coupled to the first control voltage (e.g., high voltage), the pin detection circuit 108a, the regulation generation circuit 108b, and the second feedback circuit 110_2 do not operate. In the first feedback circuit 110_1, the first detected voltage signal V1a is divided by the twelfth resistor R12 and the thirteenth resistor R13 at the inverting input terminal (-) of the first operational amplifier OP1 to generate a first voltage divider control signal VP11 (i.e., voltage divider) corresponding to an output voltage Vout of 12V. The first operational amplifier OP1 compares the first voltage divider control signal VP11 and the reference voltage signal Vref to generate a first voltage control signal S11 corresponding to an output voltage Vout of 12V. The sixteenth resistor R16 receives the first reference voltage divider signal Vref1 to generate a first shunt control signal VP12. The second operational amplifier OP2 compares the first shunt control signal VP12 and the first current detection signal V1b to generate a first current control signal S12. Therefore, the first comparator circuit 110_1c generates the first voltage control signal S11 according to the first voltage divider control signal VP11 and the reference voltage signal Vref, and the second comparator circuit 110_1d compares the first shunt control signal VP12 and the first current detection signal V1b to generate the first current control signal S12. The first control signal CS1 includes the first voltage control signal S11 and the first current control signal S12, which are used as feedback signals for voltage feedback control and current feedback control, respectively. The coupling circuit 111 generates a power conversion control signal CS according to the first control signal CS1 and sends it to the power conversion control circuit 112. The power conversion control circuit 112 generates a conversion signal Sc according to the power conversion control signal CS and sends it to the power conversion circuit 102, so that the power conversion circuit 102 generates a 12V output voltage Vout according to the conversion signal Sc, and controls the maximum output current Iout to be 5A.

[0214] As shown in the embodiment of Figure 4B, 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 not turned on, causing the pin detection circuit 108a to not operate. Correspondingly, the third switch Q3 and the fourth switch Q4 of the control generation circuit 108b are not turned on, and the first voltage V1 is not provided to the third operational amplifier OP3 and the fourth operational amplifier OP4. 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 are not operated, respectively. When the control terminal CW of the power supply 100' is not coupled to the first control voltage (e.g., high voltage), the output control circuit 108 will not provide the first voltage V1 to the second feedback circuit 110_2, and the second feedback circuit 110_2 will not operate.

[0215] When the control terminal CW is coupled to the first control voltage (e.g., high voltage), the first control voltage is greater than the breakdown voltage of the first diode D1, causing the first diode D1 to conduct. 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 voltage divider VP1. The first voltage divider VP1 is greater than the threshold voltage of the first switch Q1, causing the first switch Q1 and the second switch Q2 to conduct, thus enabling the pin detection circuit 108a to operate. After the pin detection circuit 108a operates, the first voltage V1 is subtracted from the voltage drop of the second switch Q2 and then divided by the fifth resistor R5 and the sixth resistor R6 to become the second voltage divider VP2. The second voltage divider VP2 is greater than the threshold voltage of the third switch Q3 and the fourth switch Q4, causing the third switch Q3 and the fourth switch Q4 to conduct, thus enabling the control generation circuit 108b to operate. In addition, after the pin detection circuit 108a is running, the first voltage V1 is transmitted to the third comparison circuit 110_2c and the fourth comparison circuit 110_2d due to the conduction of the second switch Q2, causing the third comparison circuit 110_2c and the fourth comparison circuit 110_2d to run. After the third switch Q3 is turned on, the seventh resistor R7 is connected in parallel with the thirteenth resistor R13. The resistance value of the seventh resistor R7 connected in parallel with the thirteenth resistor R13 decreases, causing the voltage at the inverting input terminal (-) of the first operational amplifier OP1 to decrease. Since the voltage at the non-inverting input terminals (+) of the first operational amplifier OP1 and the third operational amplifier OP3 is still 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 will cause the power conversion circuit 102 to correspondingly increase the output voltage Vout according to the conversion signal Sc, so that the first detection voltage signal V1a rises to the first voltage divider control signal VP11 (i.e., voltage divider). The voltage Vout is equal to the reference voltage signal Vref. In this embodiment, the output voltage Vout 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 of the eighth resistor R8 connected in parallel with the eleventh resistor R11 causes the voltage at the non-inverting input terminal (+) of the second operational amplifier OP2 to decrease. 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 will cause the power conversion circuit 102 to reduce the output current Iout accordingly based on the conversion signal Sc. This causes the first detection current signal V1b to decrease to be equal to the first shunt control signal VP12. In this embodiment, the maximum output current Iout is 4.1A.

[0216] The second detection voltage signal V2a is generated at the inverting input (-) of the third operational amplifier OP3 by the voltage division of the twenty-second resistor R22 and the twenty-third resistor R23 to form a second voltage divider control signal VP21 with an output voltage Vout of 24V. The third operational amplifier OP3 compares the second voltage divider control signal VP21 with the reference voltage signal Vref to generate a second voltage control signal S21 with an output voltage Vout of 24V. The reference voltage signal Vref is divided by the twentieth resistor R20 and the twenty-first resistor R21 to generate a second reference voltage divider signal Vref2, which is then fed to the twenty-sixth resistor R26. The twenty-sixth resistor R26, based on the second reference voltage divider signal Vref2, generates a second shunt control signal VP22 with a maximum output current Iout of 4.1A at the non-inverting input (+) of the fourth operational amplifier OP4. The fourth operational amplifier OP4 compares the second shunt control signal VP22 with the second detected current signal V2b to generate a second current control signal S22 with a maximum output current Iout of 4.1A. The second voltage control signal S21 and the second current control signal S22 form a voltage distribution with an output voltage Vout of 24V and a maximum output current Iout of 4.1A. A second control signal CS2 with an output current Iout of 4.1A is given to the coupling circuit 111. The coupling circuit 111 generates a power conversion control signal CS with an output voltage Vout of 24V and a maximum output current Iout of 4.1A based on the first control signal CS1 and the second control signal CS2, and gives it to the power conversion control circuit 112. The power conversion control circuit 112 generates a conversion signal Sc with an output voltage Vout of 24V and a maximum output current Iout of 4.1A based on the power conversion control signal CS, and gives it to the power conversion circuit 102. The power conversion circuit 102 generates an output voltage Vout of 24V based on the input voltage Vin and controls the maximum output current Iout to be 4.1A based on the conversion signal Sc.

[0217] Depending on the maximum output power of the power supply, it must comply with the corresponding safety regulations. In the example above, a single feedback circuit is sufficient for a power supply with an output power of 60W. However, for a power supply with an output power of 100W, two feedback circuits are required. Even if either feedback circuit fails, the single feedback circuit can still function normally, thus allowing for redundant feedback circuit design to meet safety regulations (e.g., UL 8750 Class 2 safety regulations).

[0218] Therefore, the power supplies 100 and 100' in the above embodiments, whether using a single feedback circuit or two or more feedback circuits with redundant design, can 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 100' to 12V or 24V, thereby achieving different output voltages. The output current can also be set accordingly to provide different output power, and the functions of constant voltage control and / or constant current control can be realized.

[0219] In other embodiments, the control terminal CW may also be pre-coupled to the first output terminal 102c of the power conversion circuit 102 or other suitable location. Therefore, when the power supplies 100 and 100' are powered on, the control terminal CW is coupled to the first control voltage (e.g., a high voltage), resulting in a higher preset output voltage Vout for the power supplies 100 and 100' (e.g., 24V in the above embodiment). If a lower preset output voltage Vout for the power supplies 100 and 100' is desired (e.g., 12V in the above embodiment), the connection between the control terminal CW and the first output terminal 102c of the power conversion circuit 102 can be disconnected. Therefore, when the power supplies 100 and 100' are powered on, the control terminal CW is not coupled to the first control voltage (e.g., floating, grounded, or coupled to a suitable voltage level such as a second control voltage lower than the first control voltage), and a lower output voltage Vout is output.

[0220] In the embodiment shown in Figure 5, the housing 500 is used to house some or all of the components of the power supplies 100 and 100'. Connecting lines 520 and 540 serve as input and output connecting lines, respectively, to couple the input and output terminals of the power supplies 100 and 100'. For example, connecting line 520 serves as an input connecting line coupled to the AC input terminals 114a and 114b of the power factor correction circuit 114 to receive the original voltage I / P, while connecting line 540 serves as an output connecting line coupled to the output terminals 102c and 102d of the power conversion circuit 102 to couple the light-emitting diode 200. In another embodiment, connection line 540 is coupled as an input connection line to the AC input terminals 114a and 114b of the power factor correction circuit 114 to receive the original voltage I / P, and as an output connection line, it is coupled to the output terminals 102c and 102d of the power conversion circuit 102 to couple to the light-emitting diode 200. Output voltage control line 560 is coupled to the control terminal CW and the first output terminal 102c of the power conversion circuit 102, or other suitable location, to ensure that the preset output voltage Vout of the power supplies 100 and 100' is a higher voltage value (such as 24V in the above embodiment). When the output voltage control line 560 is cut off, that is, when the output voltage control line 560 is not conducting, the control terminal CW is not coupled to the first control voltage, and the preset output voltage Vout of the power supplies 100 and 100' is a lower voltage value (such as 12V in the above embodiment).

[0221] In the embodiment shown in Figure 6, the power supply 100 of Figure 1 is installed in the housing 500 of Figure 5. Connecting line 520 is coupled to the AC input terminals 114a and 114b of the power factor correction circuit 114 to receive the original voltage I / P, while connecting line 540 is coupled to the output terminals 102c and 102d of the power conversion circuit 102 to couple to the light-emitting diode 200. The output voltage control line 560 is coupled to the control terminal CW and the first output terminal 102c of the power conversion circuit 102. Therefore, the preset output voltage Vout of the power supply 100' is a higher voltage value (such as 24V in the embodiment described above). When the output voltage control line 560 is cut off, the control terminal CW is not coupled to the first output terminal 102c, and the preset output voltage Vout of the power supply 100 is a lower voltage value (such as 12V in the embodiment described above).

[0222] In the embodiment shown in Figure 7, the power supply 100' of Figure 3 is installed in the housing 500 of Figure 5. Connecting line 520 is coupled to the AC input terminals 114a and 114b of the power factor correction circuit 114 to receive the original voltage I / P, while connecting line 540 is coupled to the output terminals 102c and 102d of the power conversion circuit 102 to couple to the light-emitting diode 200. The output voltage control line 560 is coupled to the control terminal CW and the first output terminal 102c of the power conversion circuit 102. Therefore, the preset output voltage Vout of the power supply 100' is a higher voltage value (such as 24V in the embodiment described above). When the output voltage control line 560 is cut off, the control terminal CW is not coupled to the first output terminal 102c, and the preset output voltage Vout of the power supply 100' is a lower voltage value (such as 12V in the embodiment described above).

[0223] In the embodiments shown in Figures 5-7, at least a portion of the power supply is installed within the housing, and the output voltage control line is pre-connected to the output terminal of the power conversion circuit or other suitable location, with at least a portion of the output voltage control line exposed outside the housing. By setting the output voltage control line 560 to be on, the power supply is configured to provide a higher output voltage; and by setting the output voltage control line 560 to be off, the power supply is configured to provide a lower output voltage. Therefore, the output voltage of the power supply can be set by adjusting the on / off state of the output voltage control line 560, increasing installation convenience and stability.

[0224] Although this disclosure has been described above with reference to embodiments, it is not intended to limit this disclosure. Those skilled in the art can make various changes and modifications without departing from the concept and scope of this disclosure. Therefore, the scope of protection of this disclosure shall be determined by the scope of the claims.

Claims

1. A power supply for supplying power to a load, the power supply comprising: a power conversion circuit including a first input terminal, a second input terminal, a first output terminal, and a second output terminal, the first input terminal and the second input terminal being for receiving an input voltage, the first output terminal and the second output terminal being coupled 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 coupled to the load; and a first feedback circuit coupled to the power conversion circuit. The circuit's first output terminal receives a first detected voltage signal, is coupled to the current detection circuit to receive a first detected current signal, and is coupled to the output control circuit to generate a corresponding first control signal; a coupling circuit is 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 is coupled to the coupling circuit and the power conversion circuit, and generates a conversion signal based on the power conversion control signal; a housing accommodates the power conversion circuit, the output control circuit, the current detection circuit, and the first feedback circuit. The circuit comprises at least one of a feedback circuit, a coupling circuit, and a power conversion control circuit; and an output voltage control line coupled to the control terminal of the output control circuit and the first output terminal of the power conversion circuit, wherein at least a portion of the output voltage control line is exposed in the housing; wherein when the output voltage control line is turned on, the control terminal of the output control circuit is coupled to the first output terminal of the power conversion circuit through the output voltage control line to receive a control voltage, the output control circuit sets the first feedback circuit to generate the first control signal according to the control voltage, and sets the power conversion control circuit according to the first control signal. The power conversion circuit generates a first output voltage and has a first maximum output current. When the output voltage control line is set to be non-conductive, the control terminal of the output control circuit is not coupled to the first output terminal of the power conversion circuit. The output control circuit sets the first feedback circuit to generate the first control signal and uses the first control signal to set the power conversion circuit to generate a second output voltage and have a second maximum output current. 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 power supply as claimed in claim 1, wherein the output control circuit further comprises: a pin detection circuit coupled to the first output terminal and the control terminal; and a regulation generation circuit coupled to the pin detection circuit and the first feedback circuit; the first feedback circuit further comprises: a first voltage divider circuit coupled to the first output terminal to receive the first detection voltage signal, and coupled to a reference voltage signal and the regulation generation circuit to generate a first voltage divider control signal; A first voltage regulator circuit, coupled to the first voltage divider circuit and the regulation generation circuit, is used to generate a first shunt control signal based on the reference voltage signal; A first comparator circuit is coupled to the first voltage divider circuit and is used to compare the first voltage divider control signal and the reference voltage signal to generate a first voltage control signal. A second comparator circuit, coupled to the first voltage regulator circuit, is used to compare the first shunt control signal and the first detected current signal to generate a first current control signal. The coupling circuit is coupled to the first comparator circuit and the second comparator circuit, and generates the power conversion control signal accordingly based on the first voltage control signal and the first current control signal. When the output voltage control line is set to non-conducting, the pin detection circuit and the regulation generation circuit do not operate, causing the first voltage divider circuit to divide the first detected voltage signal to generate a first voltage divider control signal with a first level. The first voltage regulator circuit generates a first reference voltage divider signal based on the first reference voltage signal generated by voltage division of the reference voltage signal. A three-level first shunt control signal causes the power conversion circuit to generate the second output voltage and have the second maximum output current. When the output voltage control line is set to be on, the control terminal is coupled to the control voltage. The pin detection circuit sets the regulation generation circuit to operate to change one or more resistor values ​​at the regulation generation circuit coupled to the first feedback circuit, so that the first voltage divider circuit divides the first detection voltage signal to generate the first voltage divider control signal with a second level. The first voltage regulator circuit generates a fourth-level first shunt control signal based on the first reference voltage divider signal, so that the power conversion circuit generates the first output voltage and has the first maximum output current.

3. The power supply as claimed in claim 2, wherein when the output voltage control line is set to non-conducting, the pin detection circuit and the regulation generation circuit do not operate, causing the first comparison circuit to compare the reference voltage signal and the voltage division of the first detection voltage signal by the first voltage divider circuit to generate the first voltage control signal; and causing the second comparison circuit to compare the first detection current signal and the first reference voltage divider signal generated by the voltage division of the reference voltage signal by the first voltage divider circuit to generate the first current control signal.

4. The power supply as claimed in claim 2, wherein when the output voltage control line is set to conduct, the control terminal is coupled to the control voltage, the pin detection circuit sets the regulation generation circuit to operate, so as to connect a seventh resistor in parallel to the first voltage divider circuit, so that the first comparator circuit compares the reference voltage signal and compares the voltage division of the first detected voltage signal by the seventh resistor connected in parallel to the first voltage divider circuit to generate the first voltage control signal; and connects an eighth resistor in parallel to the first voltage divider circuit and the first voltage regulator circuit, so that the second comparator circuit compares the first detected current signal and compares the first reference voltage divider signal generated by the voltage division of the reference voltage signal by the eighth resistor connected in parallel to the first voltage divider circuit to generate the first current control signal.

5. The power supply as claimed in claim 1, further comprising: a second feedback circuit coupled to the first output terminal of the power conversion circuit 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 according to the setting of the output control circuit; wherein the coupling circuit is coupled to the first feedback circuit and the second feedback circuit to receive the first control signal and the second control signal, and is used to generate the power conversion control signal according to the first control signal and the second control signal; wherein when the output voltage control line is set to be on, the control terminal of the output control circuit is coupled to the first output terminal of the power conversion circuit through the output voltage control line to receive the control voltage, the output control circuit sets the second control signal generated by the second feedback circuit, the first control signal and the second control signal set the power conversion circuit to correspondingly generate the first output voltage, and the power conversion circuit has the first maximum output current; and when the output voltage control line is set to be off, the output control circuit sets the second feedback circuit to not operate.

6. The power supply of claim 5, wherein the output control circuit further comprises: a pin detection circuit coupled to the first output terminal and the control terminal; and a regulation generation circuit coupled to the pin detection circuit and the first feedback circuit; the first feedback circuit further comprises: a first voltage divider circuit coupled to the first output terminal to receive the first detection voltage signal, and coupled to a reference voltage signal and the regulation generation circuit to generate a first voltage divider control signal; A first voltage regulator circuit, coupled to the first voltage divider circuit and the regulation generation circuit, is used to generate a first shunt control signal based on the reference voltage signal; A first comparator circuit is coupled to the first voltage divider circuit and is used to compare the first voltage divider control signal and the reference voltage signal to generate a first voltage control signal. And a second comparison circuit, coupled to the first voltage regulator circuit, and used to compare the first shunt control signal and the first detection current signal to generate a first current control signal; The second feedback circuit further includes: a second voltage divider circuit, coupled to the first output terminal to receive the second detection voltage signal, and coupled to the reference voltage signal, for generating a second voltage divider control signal; A second voltage regulator circuit, coupled to the second voltage divider circuit, is used to generate a second shunt control signal based on the reference voltage signal; a third comparator circuit, coupled to the second voltage divider circuit and the pin detection circuit, is used to compare the second voltage divider control signal and the reference voltage signal to generate a second voltage control signal when the pin detection circuit provides an operating voltage; A fourth comparator circuit, coupled to the second voltage regulator circuit and the pin detection circuit, compares the second shunt control signal and the second current detection signal to generate a second current control signal when the pin detection circuit provides the operating voltage. The coupling circuit, coupled to the first, second, third, and fourth comparator circuits, generates the power conversion control signal accordingly 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 output voltage control line is set to non-conducting, the pin detection circuit, the regulation generation circuit, and the second feedback circuit do not operate, causing the first voltage divider circuit to divide the first current detection signal to generate a first voltage divider control signal with a first level. The first voltage regulator circuit generates a first shunt control signal with a third level based on a first reference voltage divider signal generated by dividing the reference voltage signal, causing the power conversion circuit to generate the second current control signal accordingly. The power conversion circuit has two output voltages and a second maximum output current. When the output voltage control line is set to conduct, the control terminal is coupled to the control voltage. The pin detection circuit sets the regulation generation circuit to operate to change one or more resistor values ​​coupled to the first feedback circuit, so that the first voltage divider circuit divides the first detection voltage signal to generate a first voltage divider control signal with a second level. The first voltage regulator circuit generates a first shunt control signal with a fourth level based on the first reference voltage divider signal, so that the power conversion circuit generates the first output voltage accordingly, and the power conversion circuit has the first maximum output current. The pin detection circuit provides the operating voltage to the second feedback circuit, so that the second voltage divider circuit divides the second detection voltage signal to generate a second voltage divider control signal with the second level. The second voltage regulator circuit generates the second shunt control signal with a fourth level based on a second reference voltage divider signal generated by dividing the reference voltage signal.

7. The power supply as claimed in claim 6, wherein when the output voltage control line is set to non-conducting, the pin detection circuit, the regulation generation circuit, and the second feedback circuit do not operate, causing the first comparison circuit to compare the reference voltage signal and the voltage division of the first detection voltage signal by the first voltage divider circuit to generate the first voltage control signal; and causing the second comparison circuit to compare the first detection current signal and the first reference voltage divider signal generated by the voltage division of the reference voltage signal by the first voltage divider circuit to generate the first current control signal.

8. The power supply of claim 6, wherein when the output voltage control line is set to conduct, the control terminal is coupled to the control voltage, the pin detection circuit sets the regulation generation circuit to operate, so as to connect a seventh resistor in parallel to the first voltage divider circuit, causing the first comparator circuit to compare the reference voltage signal and the voltage division of the first detection voltage signal by the seventh resistor connected in parallel to the first voltage divider circuit, thereby generating the first voltage control signal; and an eighth resistor is connected in parallel to the first voltage divider circuit and the first voltage regulator circuit, causing the second comparator circuit to compare the first detection current signal and the voltage division of the eighth resistor. The first reference voltage signal is generated by dividing the reference voltage signal using the first voltage divider circuit, and a first current control signal is generated. The pin detection circuit provides the operating voltage to the third and fourth comparison circuits, so that the third comparison circuit compares the reference voltage signal with the voltage divider circuit of the second detection voltage signal to generate the second voltage control signal; and the fourth comparison circuit compares the second detection current signal with the voltage divider circuit of the second reference voltage signal to generate the second current control signal.

9. The power supply of claim 6, wherein the second voltage divider circuit divides the second detection voltage signal to generate the second voltage divider control signal having the second level, and the second voltage regulator circuit generates the second shunt control signal having the fourth level based on the second reference voltage divider signal, so that the power conversion circuit correspondingly generates the first output voltage and has the first maximum output current.

10. A method of operating a power supply for supplying power to a load, the power supply comprising a housing, an output voltage control line, a power conversion circuit, an output control circuit, a current detection circuit, a first feedback circuit, a coupling circuit, and a power conversion control circuit, the housing accommodating at least one of the power conversion circuit, the output control circuit, the current detection circuit, the first feedback circuit, the coupling circuit, and the power conversion control circuit, the power conversion circuit comprising a first input terminal, a second input terminal, a first output terminal, and a second output terminal, the first output terminal and the second output terminal being coupled to the load, and the output control circuit being coupled to the first input terminal. The circuit includes a control terminal, a current detection circuit comprising a first terminal coupled to the second output terminal of the power conversion circuit and a second terminal coupled 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, a power conversion control circuit coupled to the coupling circuit and the power conversion circuit, and an output voltage control line coupled to the control terminal of the output control circuit and the first output terminal of the power conversion circuit, wherein at least a portion of the output voltage control line is exposed outside the housing. The operating method includes: setting the first input terminal and the second input terminal of the power conversion circuit to receive... An input voltage is provided to supply power to a load at the first and second output terminals of the power conversion circuit; a first feedback circuit is configured to receive a first detected voltage signal from the first output terminal of the power conversion circuit and a first detected current signal from the current detection circuit, thereby generating a first control signal accordingly; a coupling circuit is configured to receive the first control signal from the first feedback circuit and generate 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 output voltage control line is set to conduction, the control terminal of the output control circuit is coupled through the output voltage control line. The power conversion circuit receives a control voltage at its first output terminal. The output control circuit configures the first feedback circuit to generate the first control signal, which in turn configures the power conversion circuit to generate a first output voltage. The power conversion circuit also has a first maximum output current. When the output voltage control line is set to be non-conductive, the output control circuit configures the first feedback circuit to generate the first control signal, which in turn configures the power conversion circuit to generate a second output voltage. The power conversion circuit also has a second maximum output current. 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 operating method of claim 10, wherein the output control circuit further includes a pin detection circuit and a regulation generation circuit, the pin detection circuit being coupled to the first output terminal and the control terminal, the regulation generation circuit being coupled to the pin detection circuit and the first feedback circuit, the first feedback circuit further including a first voltage divider circuit, a first voltage regulator circuit, a first comparator circuit and a second comparator circuit, the first voltage divider circuit being coupled to the first output terminal, a reference voltage signal and the regulation generation circuit, the first voltage regulator circuit being coupled to the first voltage divider circuit and the regulation generation circuit, the first comparator circuit being coupled to the first voltage divider circuit, and the second comparator circuit being coupled to the first voltage divider circuit. The power supply includes a second feedback circuit coupled to the first voltage regulator circuit. The second feedback circuit includes a second voltage divider circuit, a second voltage regulator circuit, a third comparator circuit, and a fourth comparator circuit. The second voltage divider circuit is coupled to the first output terminal and the reference voltage signal. The second voltage regulator circuit is coupled to the second voltage divider circuit. The third comparator circuit is coupled to the second voltage divider circuit and the pin detection circuit. The fourth comparator circuit is coupled to the second voltage regulator circuit and the pin detection circuit. The operating method includes: setting the first voltage divider circuit to receive the first detected voltage signal from the first output terminal of the power conversion circuit, and adjusting the first detected voltage signal according to the reference voltage signal and the first voltage regulator circuit. A first voltage divider control signal is generated by detecting a voltage signal; a first voltage regulator circuit is configured to generate a first current shunt control signal based on a reference voltage signal; a first comparator circuit is configured to generate a first voltage control signal based on the first voltage divider control signal and the reference voltage signal; and a second comparator circuit is configured to generate a first current control signal by comparing the first current shunt control signal and the first detected current signal; a second voltage divider circuit is configured to receive a second detected voltage signal from the first output terminal of the power conversion circuit, and generate a second voltage divider control signal based on the reference voltage signal and the second detected voltage signal; a second voltage regulator circuit is configured to generate a first voltage control signal based on the reference voltage signal. A second shunt control signal is generated based on the signal; 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 voltage divider control signal and the reference voltage signal, and the fourth comparison circuit is configured to generate a second current control signal based on the second shunt control signal and a second detection current signal; wherein the coupling circuit is coupled to the first comparison circuit, the second comparison circuit, the third comparison circuit and the fourth comparison circuit, and generates the power conversion control signal accordingly 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 output voltage control line is set to non-conducting, the pin detection circuit, the regulation generation circuit, and the second feedback circuit are not operating. This causes the first voltage divider circuit to divide the first detected voltage signal to generate a first voltage divider control signal with a first level. The first voltage regulator circuit generates a first shunt control signal with a third level based on a first reference voltage divider signal generated from the reference voltage signal, causing the power conversion circuit to correspondingly generate the second output voltage, and the power conversion circuit has the second maximum output current. When the output voltage control line is set to conducting, the control terminal is coupled to the control voltage, and the pin detection circuit sets the regulation generation circuit to operate, thereby changing the coupling of the regulation generation circuit to the first feedback circuit. One or more resistor values ​​cause the first voltage divider circuit to divide the first detected voltage signal to generate a first voltage divider control signal with a second level. The first voltage regulator circuit generates a first shunt control signal with a fourth level based on the first reference voltage divider signal, causing the power conversion circuit to correspondingly generate the first output voltage, and the power conversion circuit has the first maximum output current. Furthermore, the pin detection circuit provides the operating voltage to the second feedback circuit, causing the second voltage divider circuit to divide the second detected voltage signal to generate a second voltage divider control signal with the second level. The second voltage regulator circuit generates the second shunt control signal with the fourth level based on a second reference voltage divider signal generated from the voltage divider of the reference voltage signal.

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