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Power supply circuit and control circuit for use in the same

A power circuit and circuit technology, applied in the direction of electronic commutation motor control, AC motor control, single motor speed/torque control, etc., can solve the problems of reducing loss and reducing loss that cannot be met or realized, and achieve reduction Distortion, loss reduction effect

Active Publication Date: 2008-05-07
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technique described in Patent Document 3 is an excellent control method in which the switching operation near the maximum value of the power supply current is stopped without detecting the reference sinusoidal current command waveform and the power supply phase. However, when the output of the power supply circuit ( When the power consumption of the load connected to the DC voltage) side increases, there is a problem that distortion occurs near the zero value of the input current waveform
[0012] In addition, as mentioned above, this method can stop the switching operation near the maximum value of the input current and reduce the switching loss, but it cannot achieve further reduction of loss (improvement of efficiency)
[0013] As described above, the technology described in the patent literature has the problem that the input current waveform is distorted when the input current increases, and the demand for further reduction in loss cannot be met

Method used

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  • Power supply circuit and control circuit for use in the same
  • Power supply circuit and control circuit for use in the same
  • Power supply circuit and control circuit for use in the same

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no. 1 approach

[0035] A first embodiment of the present invention will be described with reference to FIGS. 1 to 5 . FIG. 1 is a configuration diagram of a power supply circuit according to this embodiment, FIG. 2 is a configuration block diagram showing control contents, FIGS. 3 and 4 are operation waveforms, and FIG. 5 is an external view showing an example of a usage method of a control circuit used in a power supply circuit. .

[0036] First, the configuration and operation of the power supply circuit will be described using FIG. 1 . The power supply circuit 100 is connected to an AC power supply 1, includes a rectification circuit 2 to which an AC voltage es is input, a step-up chopper circuit 3, a smoothing capacitor 4, and a control circuit 5, and supplies DC power to a load 6 connected to an output terminal of the smoothing capacitor 4. .

[0037] Here, the step-up chopper circuit 3 includes a reactor 32 connected to a rectifier circuit at one end, a diode 33 having an anode connec...

no. 2 approach

[0095] Next, the configuration of the second embodiment will be described with reference to FIGS. 6 to 8 .

[0096] FIG. 6 is a configuration diagram of the present embodiment, FIG. 7 is an explanatory diagram of the operation of changing the boosting ratio in a load state, and FIG. 8 is an external view showing an example of the utilization mode of the present embodiment. Hereinafter, the same symbols are assigned to the same components as those in the first embodiment, and description thereof will be omitted.

[0097] The structure of FIG. 6 is: a motor drive circuit including a motor 9 and an inverter circuit 8 is connected, and as a load of the power supply circuit of the present embodiment, the control circuit of the power supply circuit of the present embodiment and the control circuit of the inverter circuit are integrated. change. In other words, the control circuit 7 shown in FIG. 6 uses a microcomputer, and a single microcomputer controls the power supply circuit an...

no. 3 approach

[0113] A third embodiment of the present invention will be described using FIGS. 9 and 10 . The configuration of the power supply circuit of this embodiment is the same as that described with reference to FIG. 1 , and the only difference lies in the internal configuration of the arithmetic unit 50 .

[0114] FIG. 9 shows a configuration block diagram of this embodiment, and FIG. 10 shows an operation waveform when this embodiment is used. In this embodiment, when the step-up ratio constant control method shown in the first embodiment is used, the pulsating component of the DC voltage is used to stop the switching operation in the second half of each half cycle of the power supply cycle, so that in Patent Document 2 Based on the described technology and the configuration of the first embodiment, the efficiency of the power supply circuit can be improved. In addition, in the present embodiment, the above-described constant boost ratio control method has been described as a basi...

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PUM

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Abstract

The present invention provides a power supply circuit comprises a rectifier circuit (2) for converting an AC voltage to a DC voltage, a boost chopper circuit (3) for boosting an output voltage of the rectifier circuit based on a duty ratio signal; a smoothing circuit (4) for smoothing an output voltage of the boost chopper circuit; and a control means (5) for creating the duty ratio signal, the control means (5) is provided with a function for generating a DC voltage ripple information of the smoothing circuit, and correcting or modifying the duty ratio signal based on the DC voltage ripple information.

Description

technical field [0001] The present invention relates to a power supply circuit and a control circuit for converting an AC voltage into a boosted DC voltage. Background technique [0002] Power supply circuits that perform power factor improvement or harmonic current suppression for single-phase AC power supplies are widely used. Among them, a power supply circuit using a step-up chopper circuit including a reactor, a switching element, and a diode has a simple circuit configuration and control configuration, and is used for inverter control that does not require power regeneration. Power supply for devices (inverter air conditioners, etc.). [0003] Many power factor improvement methods or higher harmonic current suppression methods using a step-up chopper circuit have been proposed. Among them, Patent Document 1 discloses a method of controlling the input current waveform to a sinusoidal wave synchronized with the power supply voltage using only the instantaneous value of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H02M5/44H02P27/06H02M7/12H02M7/48H02P6/06H02P6/08H02P6/18H02P6/182
CPCH02M1/4225H02M2001/007Y02B70/1491Y02B70/126H02M7/2176H02M1/15H02M2001/0048Y02B70/10H02M1/0048H02M1/007
Inventor 能登原保夫田村建司船山裕治奥山敦梅田弘树
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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