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Rectifier device

A rectifier device and current technology, applied in the output power conversion device, the conversion of AC power input to DC power output, the conversion of irreversible AC power input to DC power output, etc., to reduce losses and reduce high-order harmonic currents. Effect

Active Publication Date: 2015-05-27
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, in the proposal of Patent Document 1, the waveform of the power supply voltage is required

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0037] figure 1 It is a circuit block diagram showing the overall configuration of the rectifier device in Embodiment 1 of the present invention.

[0038] like figure 1 As shown, in the rectifier device, the reactor 102 and the semiconductor switch 104 constitute a circuit (circulation) for short-circuiting the AC power source 1 . In addition, a current detection unit 103 capable of detecting the current of the loop is provided, and the detection result is input to the control circuit 100 . When the AC power source 1 is short-circuited, the current of the reactor 102 increases. When the semiconductor switch 104 is turned off, the current flowing through the reactor 102 is rectified by the diode bridge 105 and flows into the smoothing capacitor 106 and the load 4 to drive the load 4 . The DC voltage applied to the load 4 is detected by the DC voltage detection unit 110 , and the detection result is input to the control circuit 100 . Further, a voltage level comparison unit...

Embodiment approach 2

[0047] Next, use image 3 A rectifier device according to Embodiment 2 of the present invention will be described. image 3 It is a waveform diagram showing the operation principle of the method in which the loss can be further reduced by making the target current waveform a waveform other than a sine wave. In particular, when the load is light, even if the waveform distortion increases, the loss can be further reduced due to the reduction of the harmonic current. image 3 Among them, the upper waveform represents the relative relationship between AC voltage and DC voltage, the middle waveform represents the target current waveform, and the lower waveform represents the actual current waveform. image 3 In (a), the phase at which the output voltage is low and the chopping of the semiconductor switch is started (θ ON ) later than the desired phase (θ ON * )Case. At this time, since the phase period in which the AC voltage is higher than the DC voltage increases, the curren...

Embodiment approach 3

[0055] Image 6 It is a circuit diagram showing another basic circuit configuration of the rectifier device of the present invention and the circuit configuration of the rectifier device according to the third embodiment. Image 6 In the circuit shown above, the AC power source 1 is rectified via a bridge circuit composed of semiconductor switches 604a, 604b and diodes 605a, 605b, 605c, 605d via the reactor 602, and the smoothing capacitor 106 and the load 4 are driven. control method and figure 1 The rectifier device of the first embodiment is the same, and can be realized by simultaneously driving the two semiconductor switches 604a and 604b.

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PUM

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Abstract

A rectifier apparatus includes AC voltage phase detecting means 201, AC current detecting means 103 and DC voltage detecting means 110, and is configured to follow the desired target current waveform by chopping of a semiconductor switch 104. The DC voltage is adjusted so that the phase when the chopping of the semiconductor switch starts becomes the desired phase. Further, the target current waveform includes an interval of a monotonous increase and a combination of definite values in the first half of the AC power half cycle, and an interval during which the current is zero in the last half. With this arrangement, suppression of the harmonic current and the reduction of the circuit loss are made compatible, and an identical current waveform is kept also when detection accuracy of the DC voltage is not high and load fluctuations occur.

Description

technical field [0001] The present invention relates to a rectifier device for rectifying a single-phase AC power supply in households and the like to make it substantially DC, and driving a DC load, or converting the obtained DC into AC of an arbitrary frequency again through an inverter circuit to change the speed A rectifier device for driving a motor, for example, a heat pump can be formed by compressing a refrigerant with a compressor, and it is suitable for cold air, warm air, or a device for freezing food, etc., involving harmonics included in the power supply current passing therethrough. High-efficiency drive control of technology that reduces components, improves power factor, and reduces burden on power transmission systems. Background technique [0002] At present, rectifiers of this kind, for example, such as Figure 9 As shown, through the rectifier bridge 2 and the reactor 3a, the AC power supply 1 is short-circuited with the semiconductor switch 3c to charge ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12
CPCH02M1/4208H02M7/12Y02B70/10H02M1/0085H02M7/155
Inventor 吉田泉土山吉朗京极章弘川崎智广
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD