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Power Circuit Control Method

A technology of power supply circuit and control method, which is applied in the direction of control/regulation system, electrical components, and adjustment of electric variables, etc., and can solve the problems of low reliability and safety of the power supply system and low power output level

Active Publication Date: 2018-09-11
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reliability and safety of the power supply system are low, and the output level of the power supply is low

Method used

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  • Power Circuit Control Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] see figure 1 , in this embodiment, the power supply circuit includes two forward circuits 10, and each forward circuit 10 includes a high-frequency isolation transformer T1, at least one first power switch tube Q1, at least one second power switch tube Q2, The first freewheeling diode D1 and the second freewheeling diode D2. In other implementations, the forward circuit 10 may be three or more.

[0029] The power switching devices Q1 and Q2 are used to control the on-off of the circuit, and the high-frequency on-off is used to realize DC to AC conversion. The rectifier circuit 20 is a rectifier bridge, the inductance device Lf is a choke coil, and the filter capacitor Cf is an output capacitor.

[0030] In this embodiment, the power switching device may be a full-control semiconductor switching device such as an N-type MOS transistor or an IGBT.

[0031] One end of the primary side of the transformer T1 is the same-named end, and the same-named end is connected to th...

Embodiment 2

[0046] see figure 2 , in this embodiment, on the basis of the previous embodiment, each forward circuit 10 further includes two absorbing circuits 11 for absorbing voltage spikes, and the two absorbing circuits 11 are respectively connected to the first power switch tube Q1 and the second power switch tube Q2 are connected in parallel. A sink circuit 11 is connected in parallel to the drain and source of each power switch tube to absorb voltage spikes generated by the leakage inductance of the transformer T1. The snubber circuit includes a consumption resistor R1 and a snubber capacitor C1 connected in series.

Embodiment 3

[0048] see image 3 , in this embodiment, on the basis of Embodiment 1 or Embodiment 2, in order to further reduce the voltage peak at both ends of the power switch tube and improve the conversion efficiency, the resonant soft switching technology is adopted in this embodiment. Specifically, the power supply circuit further includes a resonant capacitor Cs, which is connected between one end of the secondary side of the transformer T1 connected in series and the first input end of the rectifier circuit 20, and the resonant capacitor Cs and the leakage inductance Lleak of the secondary side of the transformer T1 A resonance circuit 30 is formed.

[0049] Further, when the leakage inductance of the secondary side of the transformer T1 is not enough to match the circuit, the power supply circuit further includes a matching inductor connected between one end of the secondary side of the transformer T1 connected in series and the resonant capacitor Cs.

[0050] The resonant capaci...

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PUM

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Abstract

The invention discloses a power supply circuit and a control method therefor, and a vehicle-mounted air conditioner. The power supply circuit is connected with a direct current power supply, wherein the power supply circuit comprises at least two forward circuits, a rectifying circuit, an inductor device and a filter capacitor; each forward circuit comprises a high frequency isolating transformer, at least a first power switch tube, at least a second power switch tube, a first fly-wheel diode, and a second fly-wheel diode. The crossed dual-tube forward circuits are adopted, so that a condition of straight-through between an upper bridge and a lower bridge is avoided, and the reliability and safety of the power supply are improved; and in addition, the primary sides of multiple transformers are connected in parallel while the secondary sides of the multiple transformers are connected in series, so that the overall turn ratio of the transformers is improved, and higher output voltage level can be obtained consequently.

Description

technical field [0001] The invention relates to the field of DC power supplies, in particular to a power supply circuit, a vehicle-mounted air conditioner and a control method for the power supply circuit. Background technique [0002] The traditional car auxiliary air conditioner modified by household air conditioner or air conditioner all-in-one is powered by the vehicle's own battery. The voltage of the battery is usually a rated 24V or even 12V DC, while the power supply voltage of the auxiliary air conditioner is basically 220V AC or 310V DC. . Therefore, the step-up ratio has reached ten times or even twenty times. If a single transformer is used to realize the power conversion with such a high step-up ratio, the requirements for the transformer will be relatively high and the volume will be relatively large. As a result, the reliability and safety of the power supply system are low, and the output level of the power supply is low. Contents of the invention [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33561H02M3/33576
Inventor 吴志鹏
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD