Wide-voltage power input circuit

A technology of power input and wide voltage, applied in high-efficiency power electronic conversion, conversion of DC power input to DC power output, electrical components, etc., can solve problems such as high cost and slow start-up time, and achieve improved power factor and improved power factor , not easy to damage the effect

Active Publication Date: 2019-09-06
NINGBO SANXING MEDICAL & ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a wide-voltage power supply input circuit to solve the problems in the prior art that a super-large-capacity electrolytic capacitor needs to be selected when wide-voltage input is required, resulting in high cost and slow start-up time

Method used

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Embodiment Construction

[0026] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] At present, power terminals generally include three voltages of three-wire four-wire 57.7V / 100V, three-phase three-wire 100V, and three-phase four-wire 220V / 380V. When supplying power within a wide voltage range, it is necessary to be compatible with the above three rules at the same time. However, in the process of circuit design, it is necessary to consider both the demand for large capacity at single-phase low-voltage input and the demand for high withstand voltage of the capacitor at high-voltage input. Therefore, it is necessary to use a high-voltage electrolytic capacitor with a large capacity in the circuit. Multiple high-voltage electrolytic capacitors are connected in series or in parallel, which leads to an increase in cost...

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Abstract

The invention provides a wide-voltage power input circuit, and relates to the technical field of power supply. The power input circuit comprises a rectification module, an APFC boost module, an electrolytic capacitor, a control circuit and a low-voltage output circuit, wherein the rectification module, the APFC boost module, the electrolytic capacitor, the control circuit and the low-voltage output circuit are sequentially and electrically connected, the APFC boost module is used for entering an overvoltage protection state when a voltage after rectification of the rectification module is larger than a target value and entering a boost state when the rectified voltage is smaller than the target value so that a voltage input into the electrolytic capacitor is larger than or equal to the target value. The wide-voltage power input circuit provided by the invention has the advantages that the cost is reduced, a fault is difficult to occur and a power factor of a switch power supply is improved.

Description

technical field [0001] The invention relates to the technical field of power supply, in particular to a wide-voltage power supply input circuit. Background technique [0002] Switching power supply is the most important part of power terminal products. Traditional power terminals include three voltage supply specifications: three-wire four-wire 57.7V / 100V, three-phase three-wire 100V, three-phase four-wire 220V / 380V, usually according to different voltages Specifications design their respective power solutions. The wide voltage range input power supply must be compatible with the above three voltage specifications at the same time. [0003] At present, the power terminal is basically realized by a PWM debugging chip using a flyback transformer. However, due to the demand for large capacity of the capacitor at low voltage input, and the demand for high withstand voltage of the capacitor at high voltage input, it is necessary to choose a super large The capacity of the high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M1/42H02M1/32H02M3/335
CPCH02M1/00H02M1/32H02M1/42H02M3/33561H02M3/33569H02M1/0087Y02B70/10
Inventor 戴银斌叶孟军李正午
Owner NINGBO SANXING MEDICAL & ELECTRIC CO LTD
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