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Power supply circuit, module using same, motor drive apparatus and air conditioner

A technology of power supply circuit and power supply voltage, which is applied in the direction of AC motor control, output power conversion device, high-efficiency power electronic conversion, etc. It can solve the problems of air conditioner capacity reduction, large DC voltage change, and failure to maintain, etc., to achieve suppression of high-order Harmonic current, improved power factor, simple control effect

Active Publication Date: 2009-09-02
HITACHI POWER SEMICON DEVICE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patented technology allows for efficient and accurate control over AC voltages without causing any problems such as excessive pressure on electronic components due to changes in input conditions during operation. This results in improved performance and reduced damage caused from electrical arcs.

Problems solved by technology

This technical problem addressed in this patents relates to achieving both reduced switching losses while ensuring efficient and steady control over direct current voltages during partial switched mode operation.

Method used

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  • Power supply circuit, module using same, motor drive apparatus and air conditioner
  • Power supply circuit, module using same, motor drive apparatus and air conditioner
  • Power supply circuit, module using same, motor drive apparatus and air conditioner

Examples

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Embodiment 1

[0069] use Figure 1 to Figure 5 A first embodiment of the present invention will be described. figure 1 is an overall structural diagram of the power supply circuit of this embodiment, figure 2 is a control block diagram showing control content, image 3 , Figure 4 is an explanatory diagram of the operation of this embodiment, Figure 5 means to make figure 1 This is an overview diagram showing an example of usage of the control circuit that operates the power supply circuit.

[0070] use figure 1 Describe the structure and operation of the power supply circuit. This power supply circuit includes a rectifier circuit 2 connected to an AC power source 1 , a step-up chopper circuit 3 , a filter capacitor 4 , and a control circuit 5 , and supplies DC power to a load 6 connected to an output terminal of the filter capacitor 4 .

[0071] The step-up chopper circuit 3 includes a reactor 32 , a switching element 31 that short-circuits the AC power supply 1 through the reacto...

Embodiment 2

[0120] use Figure 6 to Figure 8 A second embodiment of the present invention will be described. The same symbols as those in the first embodiment represent the same operations, and description thereof will be omitted. Image 6 is the control block diagram of this embodiment, Figure 7 , Figure 8 It is an explanatory diagram of the operation of this embodiment. The overall circuit structure and figure 1 same.

[0121] Image 6 Like the first embodiment, it is composed of a boost ratio constant control unit 50A as a conventional technology and a boost ratio correction unit 50C as the present invention. The boost ratio correction unit 50C has the same configuration as the boost ratio correction unit 50B described in the first embodiment, and the only difference is the limit value Ed. Lim2 and limiter 504 . Furthermore, the proportional-integral compensator 502 performs the same figure 2 The shown proportional-integral compensator 501 operates in the same manner.

[0...

Embodiment 3

[0132] use Figure 9 to Figure 15 A third embodiment of the present invention will be described. The same symbols as in the first embodiment and the second embodiment represent the same operation, and description thereof will be omitted.

[0133] Figure 9 is an overall structural diagram of the motor drive device of this embodiment, Figure 10 is a control block diagram showing control content, Figure 11 , Figure 12 is an explanatory diagram of the operation of this embodiment, Figure 13 , Figure 14 is the input current waveform flowing into the power supply circuit, Figure 15 It is a module external view showing an example of the usage form of this embodiment.

[0134] Figure 9 It shows that a motor driving circuit composed of a motor 9 and an inverter circuit 8 is connected as a load of the power supply circuit of the present invention, and the control circuit of the power supply circuit of the present invention and the control circuit of the inverter circuit 8 ...

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Abstract

The object of the invention is to realize the reduction of switch loss partly caused by switch behaviour and the stable control of direct current voltage (stable control of application system) by using the power factor improvement of a boost chopper circuit or upper harmonics suppression circuit. The invention provides a power supply circuit using a constant control mode of step-up ratio. The power supply circuit has a load state generation unit generating load state information representing a state of a load which is connected with the filter circuit, and a coefficient correcting unit which corrects the first coefficient by using the load condition information, wherein the power supply circuit corrects or changes the step-up ratio according to the variation of power supply voltage or load.

Description

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Claims

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Application Information

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Owner HITACHI POWER SEMICON DEVICE
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