Current sharing type power supply device

Abstract

The invention provides a current sharing type power supply device which comprises a main power supply and a slave power supply electrically connected with the main power supply. The main power supply and the slave power supply are electrically connected with the load. The main power supply provides a main output current to the load and captures the main output current so as to generate a main feedback current. The slave power supply receives the main feedback current and provides a slave output current equal to the main output current to the load according to the main feedback current. The slave output current is captured from the power supply so as to generate a slave feedback current and a slave analog current, and the slave feedback current and the slave feedback current are added so as to generate a control current. The slave power supply stabilizes the slave output current according to the control current and the slave analog current.

Description

Technical Field

[0001] The invention relates to a supply device, and in particular to a current-balanced power supply device. Background Art

[0002] The parallel power supply device uses digital communication technology and adopts a master power supply and a slave power supply connected in parallel. The master power supply and the slave power supply communicate with each other. After the slave power supply receives the current signal of the master power supply, it takes the master current generated by the master power supply as the target and compares it with the slave current generated by the slave power supply. The digital controller adjusts the master current and the slave current, and finally achieves the purpose of parallel current sharing.

[0003] In addition to parallel communication, the digital controller must perform other functional operations and cannot be updated in real time. Therefore, the parallel communication function is limited by bandwidth and has a slow response speed. In addition, because the digital controller relies on digital communication, it has high requirements for digital resolution, especially for models with wide output range. When outputting high voltage, the digital controller is prone to insufficient resolution, resulting in unstable parallel current sharing. Taking the 380 volt (V) model as an example, the output voltage range is 167 to 400V (the firmware setting value is 160 to 408V), and the number of bits available for the digital controller is 12 bits, which means that the minimum scale for adjusting the voltage is 0.06V. When the power supply is connected in parallel, assuming that the initial voltage is 380V, and in order to balance the current, the target voltage that needs to be adjusted is 380.1V. At this time, due to insufficient resolution, the controller will correct back and forth between 380.06V and 380.12V, causing voltage and current instability. If a higher-end digital controller is used, this problem can be solved as the number of available bits increases, but the cost will inevitably increase significantly. However, when the output voltage adjustment range is larger (models above 800V), this problem will be faced again.

[0004] Therefore, the present invention aims at the above-mentioned problem and proposes a current-balanced power supply device to solve the problems generated by the prior art. Summary of the invention

[0005] The present invention provides a current-balanced power supply device, which overcomes the problem of limited resolution and improves the response speed to achieve the purpose of current balance and stable output.

[0006] In one embodiment of the present invention, a current-balanced power supply device is provided, which is electrically connected to a load. The current-balanced power supply device includes a master power supply and a slave power supply. The master power supply is electrically connected to the load, and the slave power supply is electrically connected to the master power supply and the load. The master power supply is used to provide a master output current to the load, and to capture the master output current to generate a master feedback current accordingly. The slave power supply is used to receive the master feedback current, and to provide a slave output current equal to the master output current to the load accordingly. The slave power supply is used to capture the slave output current to generate a slave feedback current and a slave analog current accordingly, and to add the master feedback current and the slave feedback current to generate a control current. The slave power supply is used to stabilize the slave output current according to the control current and the slave analog current.

[0007] In one embodiment of the present invention, the master power supply is used to provide a master output voltage corresponding to the master output current to the load, and the slave power supply is used to provide a slave output voltage equal to the master output voltage to the load according to the master feedback current.

[0008] In one embodiment of the present invention, the main power supply includes a main power supply circuit, a main current feedback circuit, a main voltage feedback circuit, a main current equalization controller, a main voltage difference amplifier circuit and a main comparator. The main power supply circuit is electrically connected to the load, the main current feedback circuit is electrically connected to the load and the main power supply circuit, the main voltage feedback circuit is electrically connected to the main power supply circuit and the load, the main current equalization controller is electrically connected to the main current feedback circuit and the slave power supply, the main voltage difference amplifier circuit is electrically connected to the main current feedback circuit and the main current equalization controller, and the main comparator is electrically connected to the main voltage difference amplifier circuit, the main voltage feedback circuit and the main power supply circuit. The main power supply circuit is used to receive a main driving voltage and generate a main output current and a main output voltage accordingly. The main current feedback circuit is used to capture the main output current and generate a main feedback current and a main analog current accordingly. The main voltage feedback circuit is used to capture the main output voltage to generate a main feedback voltage accordingly. The main current controller is used to receive the main feedback current, and accordingly generate a main digital setting voltage, and output the main feedback current. The main voltage difference amplifier circuit is used to receive the main analog current and the main digital setting voltage, and accordingly generate a main analog reference voltage. The main comparator is used to receive the main analog reference voltage and the main feedback voltage, and accordingly generate the main driving voltage.

[0009] In one embodiment of the present invention, the main power supply circuit is a phase shifted full bridge (PSFB) circuit or an inductor-inductor-capacitor (LLC) converter.

[0010] In one embodiment of the present invention, the main current sharing controller includes a main control circuit and a main proportional integral controller. The main control circuit is electrically connected to the main current feedback circuit and the slave power supply, and the main proportional integral controller is electrically connected to the main control circuit and the main voltage difference amplifier circuit. The main control circuit is used to transmit the main feedback current to the slave power supply. The main proportional integral controller is used to receive the main feedback current through the main control circuit and generate the main digital setting voltage accordingly.

[0011] In one embodiment of the present invention, the main voltage difference amplifier circuit includes a main voltage divider circuit, a main operational amplifier, a main feedback resistor and a main output resistor. The main voltage divider circuit is electrically connected to the main current feedback circuit and the main proportional integral controller, the positive input terminal and the negative input terminal of the main operational amplifier are electrically connected to the main voltage divider circuit, the main feedback resistor is electrically connected between the negative input terminal and the output terminal of the main operational amplifier, and the main output resistor is electrically connected between the output terminal of the main operational amplifier and the main comparator. The main operational amplifier is used to receive the main analog current and the main digital setting voltage through the main voltage divider circuit, and accordingly generate the main analog reference voltage through the main output resistor.

[0012] In one embodiment of the present invention, the slave power supply includes a slave power supply circuit, a slave current feedback circuit, a slave voltage feedback circuit, a slave current equalization controller, a slave voltage difference amplifier circuit and a slave comparator. The slave power supply circuit is electrically connected to the load, the slave current feedback circuit is electrically connected to the load and the slave power supply circuit, the slave voltage feedback circuit is electrically connected to the slave power supply circuit and the load, the slave current equalization controller is electrically connected to the slave current feedback circuit and the main power supply, the slave voltage difference amplifier circuit is electrically connected to the slave current feedback circuit and the slave current equalization controller, and the slave comparator is electrically connected to the slave voltage difference amplifier circuit, the slave voltage feedback circuit and the slave power supply circuit. The slave power supply circuit is used to receive a slave driving voltage and generate a slave output current and a slave output voltage accordingly. The slave current feedback circuit is used to capture the slave output current and generate a slave feedback current and a slave analog current accordingly. The slave voltage feedback circuit is used to capture the slave output voltage to generate a slave feedback voltage accordingly. The slave current equalizing controller is used to receive the master feedback current and the slave feedback current, and add them to generate a control current. The slave current equalizing controller is used to generate a slave digital setting voltage according to the control current. The slave voltage difference amplifier circuit is used to receive the slave analog current and the slave digital setting voltage, and generate a slave analog reference voltage accordingly. The slave comparator is used to receive the slave analog reference voltage and the slave feedback voltage, and generate a slave driving voltage accordingly.

[0013] In one embodiment of the present invention, the slave power supply circuit is a phase shifted full bridge (PSFB) circuit or an inductor-inductor-capacitor (LLC) converter.

[0014] In one embodiment of the present invention, the slave current equalization controller includes a slave control circuit and a slave proportional-integral controller. The slave control circuit is electrically connected to the slave current feedback circuit and the master power supply, and the slave proportional-integral controller is electrically connected to the slave control circuit and the slave voltage difference amplifier circuit. The slave control circuit is used to receive the master feedback current and the slave feedback current, and add them to generate a control current. The slave proportional-integral controller is used to receive the control current and generate a slave digital setting voltage accordingly.

[0015] In one embodiment of the present invention, the slave voltage difference amplifier circuit includes a slave voltage divider circuit, a slave operational amplifier, a slave feedback resistor and a slave output resistor. The slave voltage divider circuit is electrically connected to the slave current feedback circuit and the slave proportional integral controller, the positive input terminal and the negative input terminal of the slave operational amplifier are electrically connected to the slave voltage divider circuit, the slave feedback resistor is electrically connected between the negative input terminal and the output terminal of the slave operational amplifier, and the slave output resistor is electrically connected between the output terminal of the slave operational amplifier and the slave comparator. The slave operational amplifier is used to receive the slave analog current and the slave digital setting voltage through the slave voltage divider circuit, and accordingly generate the slave analog reference voltage through the slave output resistor.

[0016] Based on the above, the current-balanced power supply device uses analog current to overcome the limitation related to resolution and improve the response speed to achieve the purpose of current balance and stable output. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0018] Figure 1 Schematic diagram of a current-balanced power supply device according to an embodiment of the present invention.

[0019] Figure 2 Schematic diagram of a main current sharing controller according to an embodiment of the present invention.

[0020] Figure 3 FIG. 4 is a schematic diagram of a main voltage difference amplifier circuit according to an embodiment of the present invention.

[0021] Figure 4 Schematic diagram of a slave current sharing controller according to an embodiment of the present invention.

[0022] Figure 5 FIG. 4 is a schematic diagram of a voltage difference amplifier circuit according to an embodiment of the present invention.

[0023] Reference numerals:

[0024] 1: Current-balanced power supply device

[0025] 10: Main power supply

[0026] 100: Main power supply circuit

[0027] 101: Main current feedback circuit

[0028] 102: Main voltage feedback circuit

[0029] 103: Main current sharing controller

[0030] 1030: Main control circuit

[0031] 1031: Main proportional-integral controller

[0032] 104: Main voltage difference amplifier circuit

[0033] 1040: Main voltage divider circuit

[0034] 1041: Main operational amplifier

[0035] 1042: Main feedback resistor

[0036] 1043: Main output resistance

[0037] 105: Main comparator

[0038] 11: From the power supply

[0039] 110: From the power supply circuit

[0040] 111: From the current feedback circuit

[0041] 112: From the voltage feedback circuit

[0042] 113: From the current sharing controller

[0043] 1130: From the control circuit

[0044] 1131: From the proportional-integral controller

[0045] 114: From the voltage difference amplifier circuit

[0046] 1140: From the voltage divider circuit

[0047] 1141: From the operational amplifier

[0048] 1142: From the feedback resistor

[0049] 1143: From the output resistor

[0050] 115: Slave comparator

[0051] 2: Load

[0052] IO1: Main output current

[0053] VO1: Main output voltage

[0054] IF1: Main feedback current

[0055] IO2: Output current from

[0056] VO2: Output voltage

[0057] IF2: Feedback current

[0058] IA2: From analog current

[0059] VR1: Main drive voltage

[0060] IA1: Main analog current

[0061] VF1: Main feedback voltage

[0062] VD1: Main digital setting voltage

[0063] VA1: Main analog reference voltage

[0064] VR2: Slave driving voltage

[0065] VF2: Feedback voltage

[0066] VD2: Digitally set voltage

[0067] VA2: From analog reference voltage

[0068] IC: Control current DETAILED DESCRIPTION

[0069] The embodiments of the present invention will be further explained below with reference to the relevant drawings. As far as possible, the same reference numerals in the drawings and the specification represent the same or similar components. In the drawings, shapes and thicknesses may be exaggerated for simplicity and convenience. It is understood that the components not specifically shown in the drawings or described in the specification are known to those skilled in the art. Those skilled in the art may make various changes and modifications based on the content of the present invention.

[0070] Unless otherwise specified, some conditional sentences or words, such as "can", "could", "might", or "may", are generally intended to express that the embodiment of the case has, but can also be interpreted as features, elements, or steps that may not be required. In other embodiments, these features, elements, or steps may not be required.

[0071] In the following description of "one embodiment" or "an embodiment" refers to a specific element, structure or feature associated with at least one embodiment. Therefore, multiple descriptions of "one embodiment" or "an embodiment" appearing in multiple places below do not refer to the same embodiment. Furthermore, specific components, structures and features in one or more embodiments can be combined in an appropriate manner.

[0072] Certain words are used in the specification and claims to refer to specific components. However, those skilled in the art should understand that the same component may be referred to by different nouns. The specification and claims do not use differences in name as a way to distinguish components, but use differences in the functions of the components as a basis for distinction. The terms "include" and "include" mentioned in the specification and claims are open-ended terms and should be interpreted as "include but not limited to". In addition, "coupling" includes any direct and indirect connection means. Therefore, if the text describes that a main component is coupled to a slave component, it means that the main component can be directly connected to the slave component through electrical connection or signal connection methods such as wireless transmission, optical transmission, etc., or indirectly electrically or signal-connected to the slave component through other components or connection means.

[0073] The following examples are provided for description, which are only for illustration, because for those skilled in the art, various changes and modifications can be made without departing from the spirit and scope of the content of the present application, so the protection scope of the content of the present application shall be determined by the scope of the appended claims. Throughout the specification and the scope of the claims, unless the content clearly specifies, the meaning of "one" and "the" includes this type of description including "one or at least one" described elements or components. In addition, as used in this application, unless it is obvious from the specific context that the plurality is excluded, the singular article also includes the description of the plurality of elements or components. Moreover, when applied in this description and in the following full scope of the claims, unless the content clearly specifies, the meaning of "in which" may include "in which" and "on it". The terms used in the specification and the scope of the claims, unless otherwise specified, usually have the ordinary meaning of each term used in this field, in the content of this application and in the special content. Certain terms used to describe the present application will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of the present application. The use of examples anywhere throughout the specification, including examples of any term discussed herein, is intended to be illustrative only and certainly does not limit the scope and meaning of the present application or any exemplified term. Likewise, the present application is not limited to the various embodiments set forth in this specification.

[0074] A current-balanced power supply device of the present invention is proposed below, which uses analog current to overcome the limitations related to resolution and improve the response speed to achieve the purpose of current balancing and stable output.

[0075] Figure 1 is a schematic diagram of a current-balanced power supply device according to an embodiment of the present invention. Figure 1 , the following introduces a current-balanced power supply device 1. The current-balanced power supply device 1 is electrically connected to a load 2. The current-balanced power supply device 1 includes a master power supply 10 and a slave power supply 11, the master power supply 10 is electrically connected to the load 2, and the slave power supply 11 is electrically connected to the master power supply 10 and the load 2. The master power supply 10 provides a master output current IO1 and a master output voltage VO1 corresponding to the master output current IO1 to the load 2, and extracts the master output current IO1 to generate a master feedback current IF1 accordingly. The slave power supply 11 receives the master feedback current IF1, and accordingly provides a slave output current IO2 equal to the master output current IO1 and a slave output voltage VO2 equal to the master output voltage VO1 to the load 2. The slave power supply 11 extracts the slave output current IO2 to generate a slave feedback current IF2 and a slave analog current IA2, and adds the master feedback current IF1 and the slave feedback current IF2 to generate a control current. The slave power supply 11 stabilizes the slave output current IO2 and the slave output voltage VO2 according to the control current and the slave analog current IA2. The slave analog current IA2 is used to overcome the limitation related to resolution and improve the response speed to achieve the purpose of current sharing and stable output.

[0076] In some embodiments of the present invention, the main power supply 10 may include, but is not limited to, a main power supply circuit 100, a main current feedback circuit 101, a main voltage feedback circuit 102, a main current equalization controller 103, a main voltage difference amplifier circuit 104, and a main comparator 105. The main power supply circuit 100 may be, but is not limited to, a phase shifted full bridge (PSFB) circuit or an inductor-inductor-capacitor (LLC) converter. The main power supply circuit 100 is electrically connected to the load 2, the main current feedback circuit 101 is electrically connected to the load 2 and the main power supply circuit 100, the main voltage feedback circuit 102 is electrically connected to the main power supply circuit 100 and the load 2, the main current sharing controller 103 is electrically connected to the main current feedback circuit 101 and the slave power supply 11, the main voltage difference amplifier circuit 104 is electrically connected to the main current feedback circuit 101 and the main current sharing controller 103, and the main comparator 105 is electrically connected to the main voltage difference amplifier circuit 104, the main voltage feedback circuit 102 and the main power supply circuit 100. The main power supply circuit 100 receives a main driving voltage VR1, and generates a main output current IO1 and a main output voltage VO1 accordingly. The main current feedback circuit 101 captures the main output current IO1, and generates a main feedback current IF1 and a main analog current IA1 accordingly. The main voltage feedback circuit 102 captures the main output voltage VO1 to generate a main feedback voltage VF1 accordingly. The main current controller 103 receives the main feedback current IF1, and generates a main digital setting voltage VD1 accordingly, and outputs the main feedback current IF1. The main voltage difference amplifier circuit 104 receives the main analog current IA1 and the main digital setting voltage VD1, and generates a main analog reference voltage VA1 accordingly. Because the main digital setting voltage VD1 has a resolution-related limitation, the main analog current IA1 can be used to overcome this limitation, so that the main analog reference voltage VA1 has no resolution-related limitation. The main comparator 105 receives the main analog reference voltage VA1 and the main feedback voltage VF1, and generates the main driving voltage VR1 accordingly.

[0077] Figure 2 FIG. 1 is a schematic diagram of a main current sharing controller according to an embodiment of the present invention. Figure 1 and Figure 2 The main current sharing controller 103 may include, but is not limited to, a main control circuit 1030 and a main proportional integral controller 1031. The main control circuit 1030 is electrically connected to the main current feedback circuit 101 and the slave power supply 11, and the main proportional integral controller 1031 is electrically connected to the main control circuit 1030 and the main voltage difference amplifier circuit 104. The main control circuit 1030 transmits the main feedback current IF1 to the slave power supply 11. The main proportional integral controller 1031 receives the main feedback current IF1 through the main control circuit 1030, and generates the main digital setting voltage VD1 accordingly. Figure 3 FIG. 1 is a schematic diagram of a main voltage difference amplifier circuit according to an embodiment of the present invention. Figure 1 , Figure 2 and Figure 3 The main voltage difference amplifier circuit 104 may include, but is not limited to, a main voltage divider circuit 1040, a main operational amplifier 1041, a main feedback resistor 1042, and a main output resistor 1043. The main voltage divider circuit 1040 is electrically connected to the main current feedback circuit 101 and the main proportional integral controller 1031, the positive input terminal and the negative input terminal of the main operational amplifier 1041 are electrically connected to the main voltage divider circuit 1040, the main feedback resistor 1042 is electrically connected between the negative input terminal and the output terminal of the main operational amplifier 1041, and the main output resistor 1043 is electrically connected between the output terminal of the main operational amplifier 1041 and the main comparator 105. The main operational amplifier 1041 receives the main analog current IA1 and the main digital setting voltage VD1 through the main voltage divider circuit 1040, and generates the main analog reference voltage VA1 through the main output resistor 1043 accordingly.

[0078] Please continue reading Figure 1In some embodiments of the present invention, the slave power supply 11 may include, but is not limited to, a slave power supply circuit 110, a slave current feedback circuit 111, a slave voltage feedback circuit 112, a slave current equalization controller 113, a slave voltage difference amplifier circuit 114, and a slave comparator 115. The slave power supply circuit 110 may be, but is not limited to, a phase-shifted full-bridge (PSFB) circuit or an inductor-inductor-capacitor (LLC) converter. The slave power supply circuit 110 is electrically connected to the load 2, the slave current feedback circuit 111 is electrically connected to the load 2 and the slave power supply circuit 110, the slave voltage feedback circuit 112 is electrically connected to the slave power supply circuit 110 and the load 2, the slave current equalization controller 113 is electrically connected to the slave current feedback circuit 111 and the master current equalization controller 103 of the master power supply 10, the slave voltage difference amplifier circuit 114 is electrically connected to the slave current feedback circuit 111 and the slave current equalization controller 113, and the slave comparator 115 is electrically connected to the slave voltage difference amplifier circuit 114, the slave voltage feedback circuit 112 and the slave power supply circuit 110. The slave power supply circuit 110 receives a slave driving voltage VR2, and generates a slave output current IO2 and a slave output voltage VO2 accordingly. The slave current feedback circuit 111 captures the slave output current IO2, and generates a slave feedback current IF2 and a slave analog current IA2 accordingly. The slave voltage feedback circuit 112 captures the slave output voltage VO2 to generate a slave feedback voltage VF2 accordingly. The slave current equalization controller 113 receives the master feedback current IF1 and the slave feedback current IF2 and adds them to generate a control current. The slave current equalization controller 113 generates a slave digital setting voltage VD2 according to the control current. The slave voltage difference amplifier circuit 114 receives the slave analog current IA2 and the slave digital setting voltage VD2 and generates a slave analog reference voltage VA2 accordingly. Because the slave digital setting voltage VD2 has a resolution-related limitation, the slave analog current IA2 can be used to overcome this limitation, so that the slave analog reference voltage VA2 has no resolution-related limitation. The slave comparator 115 receives the slave analog reference voltage VA2 and the slave feedback voltage VF2 and generates a slave driving voltage VR2 accordingly.

[0079] Figure 4 FIG. 1 is a schematic diagram of a slave current equalizing controller according to an embodiment of the present invention. Figure 1 , Figure 2 and Figure 4The slave current equalizing controller 113 may include, but is not limited to, a slave control circuit 1130 and a slave proportional integral controller 1131. The slave control circuit 1130 is electrically connected to the slave current feedback circuit 111 and the main control circuit 1030 of the main power supply 10, and the slave proportional integral controller 1131 is electrically connected to the slave control circuit 1130 and the slave voltage difference amplifier circuit 114. The slave control circuit 1130 receives the main feedback current IF1 and the slave feedback current IF2, and adds them to generate a control current IC. The slave proportional integral controller 1131 receives the control current IC and generates a slave digital setting voltage VD2 accordingly. Figure 5 FIG. 1 is a schematic diagram of a voltage difference amplifier circuit according to an embodiment of the present invention. Figure 1 , Figure 4 and Figure 5 The slave voltage difference amplifier circuit 114 may include, but is not limited to, a slave voltage divider circuit 1140, a slave operational amplifier 1141, a slave feedback resistor 1142, and a slave output resistor 1143. The slave voltage divider circuit 1140 is electrically connected to the slave current feedback circuit 111 and the slave proportional integral controller 1131, the positive input terminal and the negative input terminal of the slave operational amplifier 1141 are electrically connected to the slave voltage divider circuit 1140, the slave feedback resistor 1142 is electrically connected between the negative input terminal and the output terminal of the slave operational amplifier 1141, and the slave output resistor 1143 is electrically connected between the output terminal of the slave operational amplifier 1141 and the slave comparator 115. The slave operational amplifier 1141 receives the slave analog current IA2 and the slave digital setting voltage VD2 through the slave voltage divider circuit 1140, and accordingly generates the slave analog reference voltage VA2 through the slave output resistor 1143.

[0080] According to the above-mentioned embodiments, the current-balanced power supply device uses analog current to overcome the limitation related to resolution and improve the response speed, so as to achieve the purpose of current balance and stable output.

[0081] The above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Therefore, all equivalent changes and modifications to the shape, structure, characteristics and spirit described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A current-balanced power supply device, electrically connected to a load, characterized in that: The current-balanced power supply device comprises: a main power supply electrically connected to the load, wherein the main power supply is used to provide a main output current to the load and to capture the main output current to generate a main feedback current; and A slave power supply is electrically connected to the master power supply and the load, wherein the slave power supply is used to receive the master feedback current and provide a slave output current equal to the master output current to the load, the slave power supply is used to capture the slave output current to generate a slave feedback current and a slave analog current, and add the master feedback current and the slave feedback current to generate a control current, and the slave power supply is used to stabilize the slave output current according to the control current and the slave analog current.

2. The current-balanced power supply device according to claim 1, wherein: The master power supply is used to provide a master output voltage corresponding to the master output current to the load, and the slave power supply is used to provide a slave output voltage equal to the master output voltage to the load according to the master feedback current.

3. The current-balanced power supply device according to claim 2, wherein: The main power supply comprises: a main power supply circuit electrically connected to the load, wherein the main power supply circuit is used to receive a main driving voltage and generate the main output current and the main output voltage accordingly; a main current feedback circuit electrically connected to the load and the main power supply circuit, wherein the main current feedback circuit is used to capture the main output current and generate the main feedback current and a main analog current accordingly; a main voltage feedback circuit electrically connected to the main power supply circuit and the load, wherein the main voltage feedback circuit is used to capture the main output voltage to generate a main feedback voltage accordingly; a main current sharing controller electrically connected to the main current feedback circuit and the slave power supply, wherein the main current sharing controller is used to receive the main feedback current, generate a main digital setting voltage accordingly, and output the main feedback current; a main voltage difference amplifier circuit electrically connected to the main current feedback circuit and the main current sharing controller, wherein the main voltage difference amplifier circuit is used to receive the main analog current and the main digital setting voltage and generate a main analog reference voltage accordingly; and A main comparator is electrically connected to the main voltage difference amplifier circuit, the main voltage feedback circuit and the main power supply circuit, wherein the main comparator is used to receive the main analog reference voltage and the main feedback voltage and generate the main driving voltage accordingly.

4. The current-balanced power supply device according to claim 3, wherein: The main power supply circuit is a phase-shifted full-bridge circuit or an inductor-inductor-capacitor converter.

5. The current-balanced power supply device according to claim 3, wherein: The main current sharing controller comprises: a main control circuit electrically connected to the main current feedback circuit and the slave power supply, wherein the main control circuit is used to transmit the main feedback current to the slave power supply; and A main proportional-integral controller is electrically connected to the main control circuit and the main differential pressure amplifier circuit, wherein the main proportional-integral controller is used to receive the main feedback current through the main control circuit and generate the main digital setting voltage accordingly.

6. The current-balanced power supply device according to claim 5, wherein: The main pressure difference amplifier circuit comprises: a main voltage divider circuit electrically connected to the main current feedback circuit and the main proportional-integral controller; a main operational amplifier, whose positive input terminal and negative input terminal are electrically connected to the main voltage divider circuit; a main feedback resistor electrically connected between the negative input terminal and the output terminal of the main operational amplifier; and A main output resistor is electrically connected between the output terminal of the main operational amplifier and the main comparator, wherein the main operational amplifier is used to receive the main analog current and the main digital setting voltage through the main voltage divider circuit, and accordingly generate the main analog reference voltage through the main output resistor.

7. The current-balanced power supply device according to claim 2, wherein: The slave power supply comprises: a slave power supply circuit electrically connected to the load, wherein the slave power supply circuit is used to receive a slave driving voltage and generate the slave output current and the slave output voltage accordingly; a slave current feedback circuit electrically connected to the load and the slave power supply circuit, wherein the slave current feedback circuit is used to capture the slave output current and generate the slave feedback current and the slave analog current accordingly; a slave voltage feedback circuit electrically connected to the slave power supply circuit and the load, wherein the slave voltage feedback circuit is used to capture the slave output voltage to generate a slave feedback voltage accordingly; a slave current balancing controller electrically connected to the slave current feedback circuit and the master power supply, wherein the slave current balancing controller is used to receive the master feedback current and the slave feedback current and add them to generate the control current, and the slave current balancing controller is used to generate a slave digital setting voltage according to the control current; a slave voltage difference amplifier circuit electrically connected to the slave current feedback circuit and the slave current equalizing controller, wherein the slave voltage difference amplifier circuit is used to receive the slave analog current and the slave digital setting voltage and generate a slave analog reference voltage accordingly; and A slave comparator is electrically connected to the slave voltage difference amplifier circuit, the slave voltage feedback circuit and the slave power supply circuit, wherein the slave comparator is used to receive the slave analog reference voltage and the slave feedback voltage and generate the slave driving voltage accordingly.

8. The current-balanced power supply device according to claim 7, wherein: The slave power supply circuit is a phase-shifted full-bridge circuit or an inductor-inductor-capacitor converter.

9. The current-balanced power supply device according to claim 7, wherein: The slave current sharing controller comprises: a slave control circuit electrically connected to the slave current feedback circuit and the master power supply, wherein the slave control circuit is used to receive the master feedback current and the slave feedback current and add them to generate the control current; and A slave proportional-integral controller is electrically connected to the slave control circuit and the slave voltage difference amplifier circuit, wherein the slave proportional-integral controller is used to receive the control current and generate the slave digital setting voltage accordingly.

10. The current-balanced power supply device according to claim 9, wherein: The slave voltage difference amplifier circuit comprises: a slave voltage-dividing circuit electrically connected to the slave current feedback circuit and the slave proportional-integral controller; a slave operational amplifier, whose positive input terminal and negative input terminal are electrically connected to the slave voltage divider circuit; a slave feedback resistor electrically connected between the negative input terminal and the output terminal of the slave operational amplifier; and A slave output resistor is electrically connected between the output terminal of the slave operational amplifier and the slave comparator, wherein the slave operational amplifier is used to receive the slave analog current and the slave digital setting voltage through the slave voltage divider circuit, and accordingly generate the slave analog reference voltage through the slave output resistor.

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