Direct-current power supply internal series voltage 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 series voltage output device. The first output circuit comprises a first rectifying circuit and a first controlled voltage stabilizing circuit; the second output circuit comprises a second rectifying circuit and a second controlled voltage stabilizing circuit; the relay is connected between the second end of the first rectifying circuit and the second end of the second controlled voltage stabilizing circuit; and the sampling feedback circuit is connected in parallel with the relay and is connected between the first controlled voltage stabilizing circuit and the second controlled voltage stabilizing circuit. The device ensures that the series output voltage is not influenced when the current or temperature of the relay changes, and ensures the precision and accuracy of the series output voltage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of direct current power supply output, in particular to a direct current power supply internal series voltage output device. BACKGROUND

[0002] In the related art, the direct current power supply internal series connection mainly adopts a relay to connect the output negative terminal of one channel with the output positive terminal of another channel, and the series output voltage is equal to the output voltage of the two channels plus the voltage on the relay. Since the relay has an internal resistance, when the output current is larger, the voltage division on the relay is larger, and the series output voltage deviation is larger, resulting in larger series voltage precision when the load is connected.

[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 direct current power supply internal series voltage output device, which solves the problem of larger series output voltage deviation when the output current is larger, resulting in larger series voltage precision when the load is connected.

[0005] The present application provides a direct current power supply internal series voltage output device, comprising:

[0006] a step-down isolation circuit;

[0007] a first output circuit, comprising: a first rectifier circuit and a first controlled voltage stabilizing circuit, the first end of the first rectifier circuit being connected with the step-down isolation circuit, the second end of the first rectifier circuit being a first negative output terminal, the first end of the first controlled voltage stabilizing circuit being connected with the third end of the first rectifier circuit, the second end of the first controlled voltage stabilizing circuit being a first positive output terminal, and the second end of the first controlled voltage stabilizing circuit being connected with a load;

[0008] a second output circuit, comprising: a second rectifier circuit and a second controlled voltage stabilizing circuit, the first end of the second rectifier circuit being connected with the step-down isolation circuit, the second end of the second rectifier circuit being a second negative output terminal, the second end of the second rectifier circuit being connected with a load, the first end of the second controlled voltage stabilizing circuit being connected with the third end of the second rectifier circuit, and the second end of the second controlled voltage stabilizing circuit being a second positive output terminal;

[0009] a relay connected between the second end of the first rectifier circuit and the second end of the second controlled voltage stabilizing circuit;

[0010] a sampling feedback circuit connected in parallel with the relay and between the first controlled voltage stabilizing circuit and the second controlled voltage stabilizing circuit.

[0011] One of the above technical solutions has at least one of the following advantages or beneficial effects: the device samples the voltage divided by the relay to the first output circuit or the second output circuit through the sampling feedback circuit, thereby ensuring that the series output voltage is not affected when the relay current changes or the temperature changes, and ensuring the accuracy and precision of the series output voltage.

[0012] In some possible implementation manners, the sampling feedback circuit has an intermediate feedback point, the intermediate feedback point is located on the first negative output end, and the intermediate feedback point is connected with the first controlled voltage stabilizing circuit feedback end and the second controlled voltage stabilizing circuit feedback end respectively.

[0013] In some possible implementation manners, the sampling feedback circuit has an intermediate feedback point, the intermediate feedback point is located on the second positive output end, and the intermediate feedback point is connected with the first controlled voltage stabilizing circuit feedback end and the second controlled voltage stabilizing circuit feedback end respectively.

[0014] The application will be further described below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0016] Fig. 1 The first embodiment circuit principle diagram of the internal series voltage output device of the direct current power supply provided by the embodiments of the present application;

[0017] Fig. 2 The second embodiment circuit principle diagram of the internal series voltage output device of the direct current power supply provided by the embodiments of the present application;

[0018] Fig. 3 The circuit principle diagram of the first controlled voltage stabilizing circuit provided by the embodiments of the present application;

[0019] In the figure: 100, voltage reduction isolation circuit;

[0020] 200, first output circuit; 210, first rectifier circuit; 220, first controlled voltage stabilizing circuit; 230, first positive output end; 240, first negative output end;

[0021] 250, first feedback sampling point;

[0022] 221, operational amplifier; 222, comparator; 223, loop control MOS tube;

[0023] 300. Second output circuit; 310. Second rectifier circuit; 320. Second controlled voltage regulator circuit; 330. Second positive output terminal; 340. Second negative output terminal;

[0024] 350. Second feedback sampling point;

[0025] 400. Relay;

[0026] 500. Sampling feedback circuit; 510. Intermediate feedback point; 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 an internal series voltage 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. The step-down isolation circuit 100 isolates and steps down the mains power, subsequently supplying power to the first output circuit 200 and the second output circuit 300. The first output circuit 200 and the second output circuit 300 have identical circuit structures and are connected by the relay 400. Both the first output circuit 200 and the second output circuit 300 convert the mains power into DC power and then output a series output voltage. The sampling feedback circuit 500 samples the voltage received by the relay 400 and feeds it to the first output circuit 200 or the second output circuit 300, thus ensuring that changes in the current or temperature of the relay 400 do not affect the series output voltage, ensuring the accuracy and precision of the series output voltage.

[0029] The following is a description of the specific circuit structure of the series voltage output device inside the DC power supply.

[0030] The voltage reduction isolation circuit 100; the first output circuit 200 comprises: a first rectifier circuit 210 and a first controlled voltage stabilizing circuit 220, the first end of the first rectifier circuit 210 is connected with the voltage reduction isolation circuit 100, the second end of the first rectifier circuit 210 is a first negative output end 240, the first end of the first controlled voltage stabilizing circuit 220 is connected with the third end of the first rectifier circuit 210, the second end of the first controlled voltage stabilizing circuit 220 is a first positive output end 230, and the second end of the first controlled voltage stabilizing circuit 220 is connected with a load; the second output circuit 300 comprises: a second rectifier circuit 310 and a second controlled voltage stabilizing circuit 320, the first end of the second rectifier circuit 310 is connected with the voltage reduction isolation circuit 100, the second end of the second rectifier circuit 310 is a second negative output end 340, the second end of the second rectifier circuit 310 is connected with a load, the first end of the second controlled voltage stabilizing circuit 320 is connected with the third end of the second rectifier circuit 310, and the second end of the second controlled voltage stabilizing circuit 320 is a second positive output end 330; the relay 400 is connected between the second end of the first rectifier circuit 210 and the second end of the second controlled voltage stabilizing circuit 320; the sampling feedback circuit 500 is connected in parallel with the relay 400 and between the first controlled voltage stabilizing circuit 220 and the second controlled voltage stabilizing circuit 320.

[0031] In some embodiments, there is a first feedback sampling point 250 on the first positive output end 230, the first feedback sampling point 250 is connected with the feedback end of the first controlled voltage stabilizing circuit 220, and there is a second feedback sampling point 350 on the second negative output end 340, the second feedback sampling point 350 is connected with the feedback end of the second controlled voltage stabilizing circuit 320.

[0032] In practical application, the voltage sampling circuit samples the voltage on the first feedback sampling point 250, that is, samples the voltage of the first positive output end 230, and feeds back the sampled voltage result to the feedback end of the first controlled voltage stabilizing circuit 220. The voltage sampling circuit samples the voltage on the second feedback sampling point 350, that is, samples the voltage of the second negative output end 340, and feeds back the sampled voltage result to the feedback end of the second controlled voltage stabilizing circuit 320. The voltage sampling circuit is not specifically limited here.

[0033] The sampling feedback circuit 500 has two wiring modes. In some embodiments, the sampling feedback circuit 500 has an intermediate feedback point 510, the intermediate feedback point 510 is located on the first negative output end 240, and the intermediate feedback point 510 is connected with the feedback end of the first controlled voltage stabilizing circuit 220 and the feedback end of the second controlled voltage stabilizing circuit 320 respectively. In this way, the voltage of the relay 400 is sampled into the second output circuit 300.

[0034] In actual application, the voltage sampling circuit samples the voltage on the intermediate feedback point 510 and feeds the sampled voltage result to the feedback end of the first controlled voltage stabilizing circuit 220 and the feedback end of the second controlled voltage stabilizing circuit 320. In combination with the sampling result of the first feedback sampling point 250, in the first controlled voltage stabilizing circuit 220, the voltage between the first feedback sampling point 250 and the intermediate feedback point 510, that is, the voltage between the first positive output end 230 and the first negative output end 240, can be feedback controlled. In combination with the sampling result of the second feedback sampling point 350, in the second controlled voltage stabilizing circuit 320, the voltage between the second feedback sampling point 350 and the intermediate feedback point 510, that is, the voltage between the second positive output end 330 and the second negative output end 340, can be feedback controlled. Thus, the voltage includes the voltage on the relay 400, so as to ensure that the series output voltage is not affected when the current or temperature of the relay 400 changes, and the precision and accuracy of the series output voltage are ensured.

[0035] In some other embodiments, the sampling feedback circuit 500 has an intermediate feedback point 510 on the second positive output end 330, and the intermediate feedback point 510 is connected to the feedback end of the first controlled voltage stabilizing circuit 220 and the feedback end of the second controlled voltage stabilizing circuit 320. Thus, the voltage of the relay 400 is sampled to the first output circuit 200.

[0036] In actual application, the voltage sampling circuit samples the voltage on the intermediate feedback point 510 and feeds the sampled voltage result to the feedback end of the first controlled voltage stabilizing circuit 220 and the feedback end of the second controlled voltage stabilizing circuit 320. In combination with the sampling result of the first feedback sampling point 250, in the first controlled voltage stabilizing circuit 220, the voltage between the first feedback sampling point 250 and the intermediate feedback point 510, that is, the voltage between the first positive output end 230 and the first negative output end 240, can be feedback controlled. In combination with the sampling result of the second feedback sampling point 350, in the second controlled voltage stabilizing circuit 320, the voltage between the second feedback sampling point 350 and the intermediate feedback point 510, that is, the voltage between the second positive output end 330 and the second negative output end 340, can be feedback controlled. Thus, the voltage includes the voltage on the relay 400, so as to ensure that the series output voltage is not affected when the current or temperature of the relay 400 changes, and the precision and accuracy of the series output voltage are ensured.

[0037] The first controlled voltage stabilizing circuit 220 and the second controlled voltage stabilizing circuit 320 have the same circuit structure. The circuit structure of the first controlled voltage stabilizing circuit 220 is described below. In some embodiments, the first controlled voltage stabilizing circuit 220 includes an operational amplifier 221, a comparator 222, and a loop control MOS transistor 223. The output terminal of the operational amplifier 221 is connected to one input terminal of the comparator 222. The other input terminal of the comparator 222 is connected to a reference voltage. The output terminal of the comparator 222 is connected to one input terminal of the loop control MOS transistor 223. The other input terminal of the loop control MOS transistor 223 is connected to the first rectifying circuit 210. The output terminal of the loop control MOS transistor 223 is the first positive output terminal 230.

[0038] In actual applications, the first sampling point and the intermediate sampling point are respectively connected to the input terminals of the operational amplifier 221. In this way, the voltage is input to the operational amplifier 221, and the voltage value between the two points is calculated. The comparator 222 compares and controls according to the reference voltage and the voltage value between the two points, and the loop control MOS transistor 223 controls the stable voltage current output.

[0039] In the description of the present application, it should be understood that the terms "first" and "second" are used only for the purpose of description and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "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, such as two, three, etc., unless otherwise specifically limited.

[0040] 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, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any person skilled in the art can make many possible changes and modifications to the technical solutions of the present application, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present application. Therefore, any equivalent changes made according to the shape, structure and principle of the present application, without departing from the technical solutions of the present application, should be covered by the protection scope of the present application.

Claims

1. A DC power supply internal series voltage output device, characterized in that, include: Step-down isolation circuit; The first output circuit includes: a first rectifier circuit and a first controlled voltage regulator circuit. The first terminal of the first rectifier circuit is connected to the step-down isolation circuit. The second terminal of the first rectifier circuit is a first negative output terminal. The first terminal of the first controlled voltage regulator circuit is connected to the third terminal of the first rectifier circuit. The second terminal of the first controlled voltage regulator circuit is a first positive output terminal. The second terminal of the first controlled voltage regulator circuit is connected to the load. The second output circuit includes: a second rectifier circuit and a second controlled voltage regulator circuit. The first terminal of the second rectifier circuit is connected to the step-down isolation circuit, the second terminal of the second rectifier circuit is the second negative output terminal, the second terminal of the second rectifier circuit is connected to the load, the first terminal of the second controlled voltage regulator circuit is connected to the third terminal of the second rectifier circuit, and the second terminal of the second controlled voltage regulator circuit is the second positive output terminal. A relay is connected between the second terminal of the first rectifier circuit and the second terminal of the second controlled voltage regulator circuit. The sampling feedback circuit is connected in parallel with the relay and between the first controlled voltage regulator circuit and the second controlled voltage regulator circuit.

2. The DC power supply internal series voltage output device according to claim 1, characterized in that, The sampling feedback circuit has an intermediate feedback point located on the first negative output terminal. The intermediate feedback point is connected to the feedback terminal of the first controlled voltage regulator circuit and the feedback terminal of the second controlled voltage regulator circuit, respectively.

3. The DC power supply internal series voltage output device according to claim 1, characterized in that, The sampling feedback circuit has an intermediate feedback point located on the second positive output terminal. The intermediate feedback point is connected to the feedback terminal of the first controlled voltage regulator circuit and the feedback terminal of the second controlled voltage regulator circuit, respectively.

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