Direct-current power supply internal dual-channel parallel output device

Abstract

The utility model belongs to the technical field of direct-current power supply output, and particularly relates to a direct-current power supply internal dual-channel parallel output device. The first output circuit is connected with the step-down isolation circuit; the second output circuit is connected with the step-down isolation circuit and is connected in parallel with the first output circuit; the relay is connected in series with the second output circuit and is connected with the first output circuit; the sampling feedback circuit is connected with the first output circuit and the relay, and the sampling feedback circuit is used for sampling the total current of the first output circuit and the second output circuit and feeding back the total current to the first output circuit and the second output circuit. According to the device, the sampling feedback circuit is arranged to sample the total current of the first output circuit and the second output circuit and feed back the total current to the first output circuit and the second output circuit, so that the influence of the internal resistance of the relay on the output current is reduced, and the current output accuracy is further ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of direct current power supply output, in particular to a double-channel parallel output device inside direct current power supply. BACKGROUND

[0002] In the related art, the parallel connection mode inside direct current power supply mainly adopts the method that the output ends of two output circuits are connected in parallel by a relay, and the relay is located on the branch of the second output circuit. When current feedback control is performed, the output currents of the first output circuit and the second output circuit are compared and then input to the second output circuit for feedback control. However, since the relay has a temperature drift of internal resistance, the output current of the second output circuit becomes smaller, thereby reducing the accuracy of current output.

[0003] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0004] In view of at least one of the above technical problems, the present application provides a double-channel parallel output device inside direct current power supply, which solves the problem of low accuracy of current output.

[0005] The present application provides a double-channel parallel output device inside direct current power supply, comprising:

[0006] a step-down isolation circuit;

[0007] a first output circuit connected with the step-down isolation circuit;

[0008] a second output circuit connected with the step-down isolation circuit and connected in parallel with the first output circuit;

[0009] a relay connected in series with the second output circuit, and the relay is connected with the first output circuit;

[0010] a sampling feedback circuit connected with the first output circuit and the relay, and the sampling feedback circuit is used for sampling the total current of the first output circuit and the second output circuit and feeding back to the first output circuit and the second output circuit respectively.

[0011] One of the above technical solutions has at least one of the following advantages or beneficial effects: the present device sets a sampling feedback circuit to sample the total current of the first output circuit and the second output circuit and feed back to the first output circuit and the second output circuit respectively, thereby reducing the influence of the relay internal resistance on the output current, and further ensuring the accuracy of current output.

[0012] In some possible implementation manners, the first output circuit comprises: a first range switching circuit, a first rectifier circuit and a first voltage stabilizing circuit connected in sequence, the first range switching circuit is connected with the voltage reduction isolation circuit, the first voltage stabilizing circuit is connected with the sampling feedback circuit, and the sampling feedback circuit is configured to feed back control on the first range switching circuit and the first voltage stabilizing circuit.

[0013] In some possible implementation manners, the first voltage stabilizing circuit comprises: a first operational amplifier, a first comparator and a first loop control MOS transistor, an input end of the first operational amplifier is connected with the sampling feedback circuit, a first input end of the first comparator is connected with an output end of the first operational amplifier, a second input end of the first comparator is connected with a reference voltage, a first input end of the first loop control MOS transistor is connected with an output end of the first comparator, a second input end of the first loop control MOS transistor is connected with the first rectifier circuit, and an output end of the first loop control MOS transistor is connected with the sampling feedback circuit.

[0014] In some possible implementation manners, the second output circuit comprises: a second range switching circuit, a second rectifier circuit and a second voltage stabilizing circuit connected in sequence, the second range switching circuit is connected with the voltage reduction isolation circuit, the second voltage stabilizing circuit is connected with the relay, and the sampling feedback circuit is configured to feed back control on the second range switching circuit and the second voltage stabilizing circuit.

[0015] In some possible implementation manners, the second voltage stabilizing circuit comprises: a second operational amplifier, a second comparator and a second loop control MOS transistor, an input end of the second operational amplifier is connected with the sampling feedback circuit, a first input end of the second comparator is connected with an output end of the second operational amplifier, a second input end of the second comparator is connected with a reference voltage, a first input end of the second loop control MOS transistor is connected with an output end of the second comparator, a second input end of the second loop control MOS transistor is connected with the second rectifier circuit, and an output end of the second loop control MOS transistor is connected with the relay.

[0016] The application will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0018] Fig. 1 The circuit schematic diagram of the internal dual-channel parallel output device of the direct current power supply provided by the embodiments of the present application is shown in the figure.

[0019] Fig. 2A circuit schematic diagram of the first output circuit provided in the embodiments of this application;

[0020] Fig. 3 A circuit schematic diagram of the second output circuit provided in the embodiments of this application;

[0021] In the diagram: 100, step-down isolation circuit;

[0022] 200. First output circuit; 210. First range switching circuit; 220. First rectifier circuit; 230. First voltage regulator circuit;

[0023] 231. First operational amplifier; 232. First comparator; 233. First loop control MOSFET;

[0024] 300. Second output circuit; 310. Second range switching circuit; 320. Second rectifier circuit; 330. Second voltage regulator circuit;

[0025] 331. Second operational amplifier; 332. Second comparator; 333. Second loop control MOSFET;

[0026] 400, Relay; 500, Sampling feedback circuit; Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] like Figs. 1 to 3 As shown, this embodiment provides a dual-channel parallel output device for a DC power supply, including: a step-down isolation circuit 100, a first output circuit 200, a second output circuit 300, a relay 400, and a sampling feedback circuit 500. This device, by setting up the sampling feedback circuit 500, samples the total current of the first output circuit 200 and the second output circuit 300 and feeds it back to the first output circuit 200 and the second output circuit 300 respectively, thereby reducing the influence of the internal resistance of the relay 400 on the output current and ensuring the accuracy of the current output.

[0029] The circuit structure of the internal dual-channel parallel output device of the DC power supply is described below.

[0030] The voltage reduction isolation circuit 100; the first output circuit 200 connected with the voltage reduction isolation circuit 100; the second output circuit 300 connected with the voltage reduction isolation circuit 100 and in parallel with the first output circuit 200; the relay 400 connected in series with the second output circuit 300, the relay 400 connected with the first output circuit 200; the sampling feedback circuit 500 connected with the first output circuit 200 and the relay 400, the sampling feedback circuit 500 used for sampling the total current of the first output circuit 200 and the second output circuit 300 and feeding back to the first output circuit 200 and the second output circuit 300 respectively.

[0031] As shown in the figure, in some embodiments, the first output circuit 200 comprises: the first range switching circuit 210, the first rectifier circuit 220 and the first voltage stabilizing circuit 230 connected in series, the first range switching circuit 210 connected with the voltage reduction isolation circuit 100, the first voltage stabilizing circuit 230 connected with the sampling feedback circuit 500, the sampling feedback circuit 500 used for feedback control of the first range switching circuit 210 and the first voltage stabilizing circuit 230. Figs. 1 to 3

[0032] Specifically, the first voltage stabilizing circuit 230 comprises: the first operational amplifier 231, the first comparator 232 and the first loop control MOS tube 233, the input end of the first operational amplifier 231 connected with the sampling feedback circuit 500, the first input end of the first comparator 232 connected with the output end of the first operational amplifier 231, the second input end of the first comparator 232 connected with the reference voltage, the first input end of the first loop control MOS tube 233 connected with the output end of the first comparator 232, the second input end of the first loop control MOS tube 233 connected with the first rectifier circuit 220, and the output end of the first loop control MOS tube 233 connected with the sampling feedback circuit 500.

[0033] In actual application, the sampling feedback circuit 500 collects the total current signal of the first output circuit 200 and the second output circuit 300, and outputs to the first comparator 232 through the first operational amplifier 231. The first comparator 232 compares the total current signal with the reference voltage and outputs the error signal to the first loop control MOS tube 233, which is used for adjusting the conduction degree of the first loop control MOS tube 233, so as to keep the output current of the first rectifier circuit 220 stable. That is to say, when the total current signal is too high, the error signal will reduce the conduction degree of the first loop control MOS tube 233, so as to reduce the output current of the first rectifier circuit 220. Conversely, when the total current signal is too low, the error signal will increase the conduction degree of the first loop control MOS tube 233, so as to increase the output current of the first rectifier circuit 220. In this way, the stability of the output current can be kept.

[0034] ​In addition, the sampling feedback circuit 500 feeds back the total current signal to the first range switching circuit 210, and a voltage value corresponding to the total current signal is compared with a preset voltage value, so as to control the on-off of different power supply voltage ranges to switch the ranges.

[0035] As shown in FIG. 1, in some embodiments, the second output circuit 300 comprises, in sequence, a second range switching circuit 310, a second rectifier circuit 320 and a second voltage stabilizing circuit 330, the second range switching circuit 310 is connected with the voltage reduction isolation circuit 100, the second voltage stabilizing circuit 330 is connected with the relay 400, and a sampling feedback circuit 500 is used to feedback control the second range switching circuit 310 and the second voltage stabilizing circuit 330. Figs. 1 to 3

[0036] Specifically, the second voltage stabilizing circuit 330 comprises a second operational amplifier 331, a second comparator 332 and a second loop control MOS tube 333, the input end of the second operational amplifier 331 is connected with the sampling feedback circuit 500, the first input end of the second comparator 332 is connected with the output end of the second operational amplifier 331, the second input end of the second comparator 332 is connected with a reference voltage, the first input end of the second loop control MOS tube 333 is connected with the output end of the second comparator 332, the second input end of the second loop control MOS tube 333 is connected with the second rectifier circuit 320, and the output end of the second loop control MOS tube 333 is connected with the relay 400.

[0037] Since the circuit structure of the second output circuit 300 is the same as that of the first output circuit 200, no further description is given here.

[0038] In the description of the present application, it should be understood that the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0039] In the embodiments of the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] ​The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Any person skilled in the art, without departing from the technical scheme of the present application, can make many possible changes and modifications to the technical scheme of the present application, or modify equivalent embodiments with equivalent changes. Therefore, any equivalent changes made according to the shape, structure and principle of the present application, without departing from the technical scheme of the present application, shall be covered within the protection scope of the present application.

Claims

1. A direct current power supply internal dual-channel parallel output device, characterized in that, Comprising: a step-down isolation circuit; a first output circuit connected with the step-down isolation circuit; a second output circuit connected with the step-down isolation circuit and in parallel with the first output circuit; a relay connected in series with the second output circuit, the relay being connected with the first output circuit; a sampling feedback circuit connected with the first output circuit and the relay, the sampling feedback circuit being used for sampling total current of the first output circuit and the second output circuit and feeding back to the first output circuit and the second output circuit respectively.

2. The apparatus according to claim 1, wherein The first output circuit comprises a first range switching circuit, a first rectifier circuit and a first voltage stabilizing circuit connected in series, the first range switching circuit being connected with the step-down isolation circuit, the first voltage stabilizing circuit being connected with the sampling feedback circuit, the sampling feedback circuit being used for feedback control of the first range switching circuit and the first voltage stabilizing circuit.

3. The DC power supply internal dual-channel parallel output device according to claim 2, characterized in that, The first voltage stabilizing circuit comprises a first operational amplifier, a first comparator and a first loop control MOS tube, an input end of the first operational amplifier being connected with the sampling feedback circuit, a first input end of the first comparator being connected with an output end of the first operational amplifier, a second input end of the first comparator being connected with a reference voltage, a first input end of the first loop control MOS tube being connected with an output end of the first comparator, a second input end of the first loop control MOS tube being connected with the first rectifier circuit, and an output end of the first loop control MOS tube being connected with the sampling feedback circuit.

4. The apparatus according to claim 1, wherein The second output circuit comprises a second range switching circuit, a second rectifier circuit and a second voltage stabilizing circuit connected in series, the second range switching circuit being connected with the step-down isolation circuit, the second voltage stabilizing circuit being connected with the relay, the sampling feedback circuit being used for feedback control of the second range switching circuit and the second voltage stabilizing circuit.

5. The DC power supply internal dual-channel parallel output device according to claim 4, characterized in that, The second voltage stabilizing circuit comprises a second operational amplifier, a second comparator and a second loop control MOS tube, an input end of the second operational amplifier being connected with the sampling feedback circuit, a first input end of the second comparator being connected with an output end of the second operational amplifier, a second input end of the second comparator being connected with a reference voltage, a first input end of the second loop control MOS tube being connected with an output end of the second comparator, a second input end of the second loop control MOS tube being connected with the second rectifier circuit, and an output end of the second loop control MOS tube being connected with the relay.

Images