Power control double-path switching circuit for power supply with double-path output power supply and power supply

Abstract

The embodiment of the utility model discloses a power control double-path switching circuit for a double-path output power supply power supply and a power supply. The circuit comprises an optocoupler PC1A, a resistor R1, an optocoupler PC1B, a resistor R2, a resistor R3, a reference chip U1, a resistor R4 and a DCDC chip U2. An anode of the optocoupler PC1A is connected with VOUT1 + of the first output, one end of the resistor R2, a power input end Vin and an input pin VIN of the DCDC chip U2, and the other end of the resistor R2 is connected with one end of the resistor R1 and a reference electrode of the reference chip U1. According to the utility model, the second output is adjusted in a real-time feedback mode, the power of the second output is reduced when the power of the main output is too large in the first output and the second output, the output power of the first output is ensured, the reliable operation of the main output is realized, and the self-adaptive power distribution is realized by the two outputs. And falling or turn-off during transient power change of the main circuit is avoided.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of power supply, and in particular to a power control dual-path switching circuit and a power supply for a power supply with dual-path output. Background Art

[0002] With the continuous advancement of technology, power supplies are becoming smaller and smaller, and the power density is getting higher and higher. There are endless types of power supply systems, and dual-output power supply systems are becoming more and more widely used. However, in the existing dual-output power supply systems, there are sometimes load imbalances and dynamic power changes, which affect the stability of the main output power. Under constant power input conditions, adaptive power allocation cannot be performed for the dual outputs, and drops or shutdowns occur when the main power changes transiently. Utility Model Content

[0003] In order to solve the related technical problems, the utility model provides a power control dual-way switching circuit and a power supply for a power supply with dual-way output power supply to solve the problems mentioned in the above background technology part.

[0004] To achieve the above purpose, the embodiment of the utility model adopts the following technical solutions:

[0005] In a first aspect, an embodiment of the utility model provides a power control dual-way switching circuit for a power supply with dual-way output power supply, the circuit comprising: an optical coupler PC1A, a resistor R1, an optical coupler PC1B, a resistor R2, a resistor R3, a reference chip U1, a resistor R4 and a DCDC chip U2; wherein the anode of the optical coupler PC1A is connected to VOUT1+ of the first output, one end of the resistor R2, a power input terminal Vin, and an input pin VIN of the DCDC chip U2, the other end of the resistor R2 is connected to one end of the resistor R1 and a reference electrode of the reference chip U1, and the cathode of the reference chip U1 is connected to the optical coupler PC1A The cathode of the resistor R1 is connected, the other end of the resistor R1 is connected to the anode of the reference chip U1 and then to the ground GND, the emitter of the optocoupler PC1B is connected to the VOUT- of the first output, one end of the resistor R3 is connected to the collector of the optocoupler PC1B, the other end of the resistor R3 is connected to the feedback end FB, one end of the resistor R4 is connected to the feedback end FB and the feedback pin FB of the DCDC chip U2, the other end of the resistor R4 is connected to the VOUT2+ of the second output and the output pin OUT of the DCDC chip U2, and the ground pin GND of the DCDC chip U2 is connected to the VOUT- of the second output.

[0006] In a second aspect, an embodiment of the utility model provides a power supply, which adopts the power control dual-path switching circuit of the power supply for dual-path output power supply described in the first aspect above.

[0007] The technical solution proposed in the embodiment of the utility model adopts a real-time feedback method to adjust the second output. When the main power is too large in the first output and the second output, the second output power is reduced to ensure the output power of the first output, i.e. the main output, and realize reliable operation of the main output. The dual output realizes adaptive power distribution to avoid drops or shutdowns when the main power changes transiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate and understand the technical solutions in the embodiments of the present invention, the following briefly introduces the background technology of the present invention and the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0009] Figure 1 A structural diagram of a power control dual-way switching circuit for a power supply with dual-way output power supply provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0010] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0011] Embodiment 1

[0012] Please refer to Figure 1 As stated, Figure 1A structural diagram of a power control dual-way switching circuit for a power supply with dual outputs provided in an embodiment of the utility model. As shown in the figure, the power control dual-way switching circuit for a power supply with dual outputs in this embodiment includes: an optical coupler PC1A, a resistor R1, an optical coupler PC1B, a resistor R2, a resistor R3, a reference chip U1, a resistor R4, and a DCDC chip U2; wherein the anode of the optical coupler PC1A is connected to the VOUT1+ of the first output, one end of the resistor R2, the power input terminal Vin, and the input pin VIN of the DCDC chip U2, the other end of the resistor R2 is connected to one end of the resistor R1 and the reference electrode of the reference chip U1, and the cathode of the reference chip U1 is connected to the cathode of the optical coupler PC1A. , the other end of the resistor R1 is connected to the anode of the reference chip U1 and then to the ground GND, the emitter of the optocoupler PC1B is connected to the VOUT- of the first output, one end of the resistor R3 is connected to the collector of the optocoupler PC1B, the other end of the resistor R3 is connected to the feedback end FB, one end of the resistor R4 is connected to the feedback end FB and the feedback pin FB of the DCDC chip U2, the other end of the resistor R4 is connected to the VOUT2+ of the second output and the output pin OUT of the DCDC chip U2, and the ground pin GND of the DCDC chip U2 is connected to the VOUT- of the second output.

[0013] In this embodiment, Vin and GND constitute the input voltage, Vout1+ and Vout- constitute the first output, i.e., the main output, and Vout2+ and Vout- constitute the second output. In actual use, the input end is a constant power source, which has the characteristic that the output voltage decreases as the output current increases. In order to ensure that when both paths are loaded at the same time, the first path is constant at a certain voltage point to reduce the output power of the second path and ensure the output of the first path. In this embodiment, resistors R1 and R2 are input voltage-dividing resistors, and resistors R3 and R4 are voltage-dividing resistors of the output voltage of the feedback end FB. When the total power of the first path and the second path is less than the total input power, the input voltage is constant, and the optocoupler PC1 composed of the optocoupler PC1A and the optocoupler PC1B is not turned on, and the two outputs are consistent with the input voltage. When the input voltage decreases, the resistors R1 and R2 form a voltage divider, which is compared with the reference chip U1. The feedback is fed back through the optocoupler PC1 to control the feedback pin FB of the DCDC chip U2. When the optocoupler PC1 is turned on, the pin FB voltage decreases accordingly, and the VOUT2+ output voltage decreases due to the decrease in the FB pin, thereby reducing the output power.

[0014] The power control dual-path switching circuit of the power supply for dual-path output power supply proposed in the embodiment of the utility model adopts real-time feedback to adjust the second path output, and reduces the second path output power when the main path power is too large in the first path output and the second path output, thereby ensuring the output power of the first path, i.e., the main path, and realizing reliable operation of the main path output. The dual-path output realizes adaptive power distribution, and avoids a drop or shutdown when the main path power changes transiently.

[0015] Embodiment 2

[0016] The embodiment of the utility model provides a power supply, which adopts the power control dual-path switching circuit of the power supply for dual-path output power supply described in the above-mentioned embodiment 1.

[0017] The power supply proposed in the embodiment of the utility model adopts a real-time feedback method to adjust the second output. When the main power is too large in the first output and the second output, the second output power is reduced to ensure the output power of the first output, i.e., the main output, and realize reliable operation of the main output. The dual output realizes adaptive power distribution to avoid drops or shutdowns when the main power changes transiently.

[0018] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power control dual-way switching circuit for a power supply with dual-way output power supply, characterized in that: include: Optocoupler PC1A, resistor R1, optocoupler PC1B, resistor R2, resistor R3, reference chip U1, resistor R4 and DCDC chip U2; wherein the anode of the optocoupler PC1A is connected to VOUT1+ of the first output, one end of the resistor R2, the power input terminal Vin, and the input pin VIN of the DCDC chip U2, the other end of the resistor R2 is connected to one end of the resistor R1 and the reference electrode of the reference chip U1, the cathode of the reference chip U1 is connected to the cathode of the optocoupler PC1A, and the other end of the resistor R1 is connected to the reference chip U1 The anode of the optical coupler PC1B is connected to the ground GND, the emitter of the optical coupler PC1B is connected to the VOUT- of the first output, one end of the resistor R3 is connected to the collector of the optical coupler PC1B, the other end of the resistor R3 is connected to the feedback end FB, one end of the resistor R4 is connected to the feedback end FB and the feedback pin FB of the DCDC chip U2, the other end of the resistor R4 is connected to the VOUT2+ of the second output and the output pin OUT of the DCDC chip U2, and the ground pin GND of the DCDC chip U2 is connected to the VOUT- of the second output.

2. A power supply, characterized in that: The power supply adopts the power control dual-path switching circuit for a power supply with dual-path output power supply as claimed in claim 1.

Images