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rectifier circuit device

A technology of rectifier circuit and AC power supply, applied in output power conversion devices, electrical components, high-efficiency power electronic conversion and other directions, can solve problems such as circuit loss, and achieve the effect of less device loss and less high-order harmonic current.

Active Publication Date: 2015-09-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the semiconductor switch 3c is turned on and off (hereinafter referred to as chopping), and a current flows through the semiconductor switch 3c for chopping, so a circuit loss occurs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0040] figure 1 It is a circuit block diagram showing the overall configuration of the rectifier circuit device in Embodiment 1 of the present invention.

[0041] exist figure 1 In this configuration, a circuit that short-circuits the AC power source 1 between the reactor 102 and the semiconductor switch 104 in the conduction state is formed. The current detection unit 103 is provided so as to be able to detect the current of the circuit, and the detection result is input to the control circuit 100 . If the semiconductor switch 104 is turned on to short-circuit the AC power supply 1, the current of the reactor 102 gradually increases, and if the semiconductor switch 104 is turned off, the current flowing through the reactor 102 is rectified in the diode bridge 105 and flows into the smoothing capacitor 106 and In the load 4, the load 4 is driven. The DC voltage applied to the load 4 is detected by the DC voltage detection unit 110 and input into the control circuit 100 . ...

Embodiment approach 2

[0059] Next, a rectifier circuit device according to Embodiment 2 of the present invention will be described. The rectifier circuit device of Embodiment 2 has substantially the same configuration as the rectifier circuit device of Embodiment 1 described above, but the drive control in the rectifier circuit device is different.

[0060] Figure 5 This is a waveform diagram showing the operating principle of a control method that can further reduce losses by making the target current waveform into a waveform other than a sine wave. Especially when the load is light, even if the waveform distortion increases, the harmonic current itself is small, so the loss can be further reduced. exist Figure 5 The waveforms in the middle and upper sections represent the relative relationship between the AC voltage and the DC voltage, the waveforms in the middle section are the target current waveforms, and the waveforms in the lower section are the actual current waveforms. exist Figure ...

Embodiment approach 3

[0069] Next, a rectifier circuit device in Embodiment 3 of the present invention will be described.

[0070] Figure 8 It is a circuit diagram showing a basic circuit configuration of a rectifier circuit device in Embodiment 3 of the present invention. Figure 8 The AC power source 1 of the rectifier circuit device according to Embodiment 3 shown is connected to a bridge circuit composed of semiconductor switches 604a, 604b and diodes 605a, 605b, 605c, and 605d via a reactor 602, and rectified in the bridge circuit Current is supplied to the smoothing capacitor 106 and the load 4 to drive the load 4 . The control method in the rectifier circuit device of Embodiment 3 and figure 1 It is the same as Embodiment 1 shown, and is realized by simultaneously driving the two semiconductor switches 604a and 604b.

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PUM

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Abstract

In order to realize a rectifier circuit device capable of attaining both reduction of power-supply harmonics and reduction of circuit losses, AC-voltage phase detection means 201, AC electric-current detection means 103 and DC-voltage detection means 110 are provided, and chopping is performed on a semiconductor switch 104 in such a way as to follow a desired electric-current waveform. A DC voltage is adjusted such that a phase at which the chopping is halted comes to be a desired phase. Also, when the phase width within which the chopping is continued is less than a set value, the DC voltage is adjusted preferentially such that the phase width within which the chopping is continued comes to be the set value. A target electric-current waveform has a combination of a monotonous increase and a constant value within the former half the period of an AC power supply and, also, has a value of zero in an interval within the latter half thereof.

Description

technical field [0001] The present invention relates to a rectifier circuit device, which is suitable for rectifying a single-phase AC power supply such as a household to form a roughly DC power supply, and using the formed DC power supply to drive a DC load; and using an inverter circuit to convert the obtained A device that converts direct current into alternating current of any frequency and drives a motor at a variable speed, such as a device that uses a compressor to compress a refrigerant to form a heat pump for cooling, heating, or freezing of food. The present invention relates to drive control of highly efficient rectifier circuit devices capable of reducing the load on power transmission systems by reducing harmonic components in power supply current contained in such various devices and improving power factors. Background technique [0002] In the prior art, such a rectifier circuit device such as Figure 10 As shown, through the rectifier bridge 2 and the reactor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12
CPCH02M7/217Y02B70/126H02M1/4208H02M1/0085Y02B70/10
Inventor 吉田泉土山吉朗京极章弘川崎智广
Owner PANASONIC CORP
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