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Voltage output circuit and PD power supply

A voltage output and circuit technology, applied in high-efficiency power electronic conversion, output power conversion device, DC power input conversion to DC power output, etc. , to achieve the effect of improving cost and smoothness

Pending Publication Date: 2022-04-15
SHENZHEN LIPOWER POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the power supply circuit uses a bridge rectifier circuit for rectification, and then outputs to the transformer for transformed output. Although power supply can be realized, there are defects such as low voltage smoothness and inability to provide wide voltage power supply.
[0004] In summary, the existing power supply circuit has technical problems such as low voltage smoothness and inability to provide wide voltage power supply.

Method used

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  • Voltage output circuit and PD power supply
  • Voltage output circuit and PD power supply
  • Voltage output circuit and PD power supply

Examples

Experimental program
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Effect test

Embodiment 1

[0029] see Figure 1-Figure 5 , in order to overcome the shortcomings of the prior art, this embodiment provides a voltage output circuit, including a two-stage common-mode filter circuit, a bridge rectification circuit, an auxiliary rectification circuit and a synchronous rectification circuit, the specific circuit description is as follows.

[0030] On the one hand, the two-stage common-mode filter circuit is used to filter the input mains voltage.

[0031] It should be noted that the common-mode filter circuit usually uses a ferrite core, and two wires are wound in parallel. It has the characteristics of low differential mode noise signal suppression of interference sources, and is difficult to deform in high-speed signals. It can include high common mode noise suppression and low differential mode noise signal suppression.

[0032] In addition, the common-mode filter circuit has a simple structure and usually includes a common-mode capacitor, an unbalanced transformer or ...

Embodiment 2

[0052] see figure 2 , On the basis of the above embodiments, the voltage output circuit further includes: an absorbing circuit; the input end of the absorbing circuit is connected in parallel with one end of a plurality of capacitors, and the output end of the absorbing circuit is connected to the input end of the output transformer.

[0053] It should be noted that there are noise signals in the signals directly input and output to the transformer through multiple capacitors. In this embodiment, an absorbing circuit is set between the output terminals of multiple capacitors and the input terminal of the transformer to absorb the noise signals and obtain a relatively smooth signal. The output voltage.

[0054] In a preferred embodiment, see Figure 5 , the absorbing circuit includes a resistor R2, a resistor R3 and a capacitor C3 connected in parallel with the input terminal of the output transformer. Exemplarily, the input terminal of the output transformer is pin 1 of the...

Embodiment 3

[0057] see image 3 , on the basis of the above embodiments, the voltage output circuit also includes a high-voltage start-up circuit; the input end of the high-voltage start-up circuit is connected to the output end of the two-stage common-mode filter circuit, and the output end of the high-voltage start-up circuit is connected to the controlled end of the output transformer .

[0058] It should be noted that the high-voltage start-up circuit can perform high-voltage start-up of the output transformer by being connected to the controlled terminal of the output transformer, and drive the output transformer to perform voltage conversion, thereby achieving the technical effect of reducing standby power consumption.

[0059] It should also be noted that high pressure is a well-known technical term in the art.

[0060] In a preferred embodiment, see Figure 5 , the high-voltage starting circuit includes diode D1, diode D2, resistor R1, chip U9, resistor R6, resistor R7, resistor...

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Abstract

The invention belongs to the technical field of power supply, and discloses a voltage output circuit which is characterized in that a two-stage common-mode filter circuit is connected to mains supply voltage for filtering processing, a bridge rectifier circuit is connected with the output end of the two-stage common-mode filter circuit and carries out bridge rectifier processing on the mains supply voltage after filtering processing, an auxiliary rectifier circuit comprises a plurality of capacitors, and the capacitors are connected with the output end of the two-stage common-mode filter circuit. A plurality of capacitors are connected in parallel between the output end of the bridge rectifier circuit and an output transformer and are used for carrying out auxiliary rectification on the commercial power voltage after bridge rectification, the output transformer outputs the commercial power voltage after auxiliary rectification in a transformation manner, and the synchronous rectifier circuit is connected with the output end of the output transformer. And the plurality of capacitors are connected in parallel between the bridge type rectification circuit and the output transformer and are connected with the front-end bridge type rectification circuit and the rear-end synchronous rectification circuit, so that the smoothness of the output working voltage is improved, and the cost is reduced at the same time.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to a voltage output circuit and a PD power supply. Background technique [0002] In electronic products, the power supply circuit is an indispensable part. Usually, the power supply circuit is composed of unit circuits such as a step-down circuit, a two-stage common-mode filter circuit, and a rectification circuit, and ultimately needs to provide a stable DC voltage to power electronic products. [0003] In the prior art, the power supply circuit is rectified by a bridge rectifier circuit, and then output to a transformer for transformed output. Although power supply can be realized, there are defects such as low voltage smoothness and inability to provide wide-voltage power supply. [0004] To sum up, the existing power supply circuit has technical problems such as low voltage smoothness and inability to provide wide voltage power supply. Contents of the invention [0005] In order to ...

Claims

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Application Information

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IPC IPC(8): H02M1/12H02M7/08H02M3/335H02M1/32
CPCH02M1/126H02M7/08H02M3/33592H02M1/32Y02B70/10
Inventor 郭华北
Owner SHENZHEN LIPOWER POWER SUPPLY CO LTD
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