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Overvoltage protection circuit and power conversion device provided therewith

A technology for protecting circuits and overvoltage, which is applied in the direction of protection against overvoltage, can solve problems such as equipment failure, and achieve the effect of avoiding voltage drop

Inactive Publication Date: 2018-08-17
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Equipment used in areas where the power supply voltage is likely to fluctuate, regardless of the countermeasures against voltage rise, may cause equipment failure

Method used

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  • Overvoltage protection circuit and power conversion device provided therewith
  • Overvoltage protection circuit and power conversion device provided therewith
  • Overvoltage protection circuit and power conversion device provided therewith

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0093] (1) Structure of the overvoltage protection circuit 50

[0094] figure 1 It is a circuit diagram of a device including the overvoltage protection circuit 50 according to the first embodiment of the present invention. exist figure 1 In this example, the device 30 is powered from a commercial power source 90 via a pair of power cords 901 , 902 . The overvoltage protection circuit 50 is connected between the commercial power supply 90 and the device 30 .

[0095] The overvoltage protection circuit 50 includes an impedance circuit 20 , a voltage detector 33 , and a bypass circuit 35 .

[0096] (2) Concrete structure of overvoltage protection circuit 50

[0097] (2-1) Impedance circuit 20

[0098] The impedance circuit 20 is configured as a circuit in which the ratio of voltage to current in the circuit, that is, the impedance value, becomes Z.

[0099] Impedance circuit 20 is connected between commercial power supply 90 and device 30 on power supply line 90 .

[0100...

no. 2 Embodiment approach

[0131] (1) Structure of the overvoltage protection circuit 50

[0132] Figure 5 It is a circuit diagram of a device including the overvoltage protection circuit 50 according to the second embodiment of the present invention. exist Figure 5 In this example, the device 30 is powered from a commercial power source 90 via a pair of power cords 901 , 902 . The overvoltage protection circuit 50 is connected between the commercial power supply 90 and the device 30 .

[0133] The overvoltage protection circuit 50 includes an impedance circuit 20 , a voltage detector 33 , a bypass circuit 35 and a second switch 12 .

[0134] (2) Concrete structure of overvoltage protection circuit 50

[0135] In the second embodiment, the second switch 12 is added to the first embodiment, and the impedance circuit 20, the voltage detector 33, and the bypass circuit 35 have the same configuration. Therefore, only the second switch 12 will be described here.

[0136] (2-1) Second switch 12

[01...

no. 3 Embodiment approach

[0156] (1) Structure of the power conversion device 300

[0157] Figure 7 It is a circuit diagram of a power conversion device 300 including an overvoltage protection circuit 100 according to a third embodiment of the present invention. exist Figure 7 Among them, the power conversion device 300 is composed of a DC power supply unit 80 , an inverter 95 , and an overvoltage protection circuit 100 .

[0158] The inverter 95 is powered from the DC power supply unit 80 via a pair of power supply lines 801 and 802 . Overvoltage protection circuit 100 is connected between DC power supply unit 80 and inverter 95 .

[0159] (1-1) DC power supply unit 80

[0160] The DC power supply unit 80 is composed of a rectification unit 81 and a smoothing capacitor 82 connected in parallel to the rectification unit 81 .

[0161] The rectification unit 81 is configured in a bridge shape by four diodes D1a, D1b, D2a, and D2b. Specifically, diodes D1a and D1b, D2a and D2b are connected in ser...

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Abstract

This invention addresses the problem of providing a small-form-factor, low-cost overvoltage protection circuit that protects equipment from momentary excessive voltages and a power conversion device provided with said overvoltage protection circuit. In said overvoltage protection circuit (50), normally, a switch (11) is on, closing a bypass circuit (35), so no power is consumed in an impedance circuit (20), preventing a voltage being applied to equipment (30) from decreasing by an amount equal to the voltage drop across said impedance circuit (20). When an overvoltage occurs, the switch (11) turns off such that the voltage applied to the equipment (30) is reduced by an amount equal to the voltage drop corresponding to the impedance (Z) of the impedance circuit (20), making it possible to protect said equipment (30) from the overvoltage. Also, a second switch (12) opens a power-supply line (901), stopping the impedance circuit (20) from consuming power. This makes it possible to preventoverheating of the impedance circuit (20) and reduce the power rating.

Description

[0001] This application is an invention patent application with application number 201480070190.2 (international application number: PCT / JP2014 / 084101, application date: December 24, 2014, invention name: overvoltage protection circuit and power conversion device with the overvoltage protection circuit ) for a divisional application. technical field [0002] The present invention relates to an overvoltage protection circuit and a power conversion device with the overvoltage protection circuit. Background technique [0003] Equipment used in areas where the power supply voltage tends to fluctuate may cause equipment failure no matter how the countermeasures are taken when the voltage rises. Therefore, an overvoltage protection circuit as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2009-207329 ) is provided. This overvoltage protection circuit is configured to cut off the power supply through a relay when the voltage reaches a predetermined voltage or higher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/20
CPCH02H3/20
Inventor 佐藤俊彰矢吹俊生田口泰贵三井淳也森田康平畑山敬之
Owner DAIKIN IND LTD
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