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power conversion device

A power conversion device and power supply technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problem of consuming capacitor charges and so on

Inactive Publication Date: 2019-12-27
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In a drive circuit of a conventional power conversion device, an upper-arm switching element and a lower-arm switching element are connected in series on both sides of a first DC power supply, and a capacitor used as a driving power source for the upper-arm switching element is separated by a diode. Connected to the + side of the second DC power supply, the capacitor is charged when the switching element of the lower arm is turned on, and the charge of the capacitor is consumed when the switching element of the upper arm is turned on

Method used

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Embodiment approach 1

[0018] figure 1 It is a circuit diagram showing the configuration of the power conversion device according to Embodiment 1 of the present invention. figure 1 The shown power conversion device 12 has: a DC power supply 1 as a first DC power supply, an upper-arm switching element 2 as a first switching element, a lower-arm switching element 3 as a second switching element, and a first drive circuit. The upper arm side drive circuit 4, the lower arm side drive circuit 5 as the second drive circuit, the DC power source 6 as the second DC power source, the capacitor 7, the diode 8, and the shunt resistor 9. In addition, the upper-arm switching element 2 , the lower-arm switching element 3 , and the shunt resistor 9 are connected in series in this order to form a series circuit 10 .

[0019] The power conversion device 12 has a control unit (not shown) that controls the first drive circuit and the second drive circuit. This control unit is realized by, for example, a CPU (Central ...

Embodiment approach 2

[0038] Figure 4 It is a circuit diagram showing the configuration of a power conversion device according to Embodiment 2 of the present invention. Figure 4 The illustrated power conversion device 12a is compatible with figure 1 The power conversion device 12 shown is different in that it has a shunt resistor 20 instead of the shunt resistor 9 . The shunt resistor 20 is connected between the connection point on the lower side of the series circuits 21, 21a, 21b as the inverter circuit and the DC power supply 1, and the output current during normal operation can be obtained from the bus current flowing through the shunt resistor 20. . The series circuit 21 includes a U-phase upper arm switching element 2 and a U-phase lower arm switching element 3 , and the output unit 11 is connected between the upper arm switching element 2 and the lower arm switching element 3 . The series circuit 21a includes a V-phase upper arm switching element 2a and a V-phase lower arm switching ele...

Embodiment approach 3

[0043] Image 6 It is a circuit diagram showing the configuration of a power conversion device according to Embodiment 3 of the present invention. Image 6 The power conversion device 12b shown is compatible with figure 1 The power conversion device 12 shown is different, that is, there is a current limiting resistor 30 between the branch point where the DC power supply 6 branches off to the lower arm side drive circuit 5 and the diode 8 , but no shunt resistor 9 .

[0044] exist Image 6 In the shown power conversion device 12b, the output current during normal operation is detected by a current detector isolated from the output from the inverter output to the motor. At this time, since the charging current of the bootstrap circuit does not flow through the current detector, the charging current is obtained by measuring the voltage Vr=Vs−Vm across the current limiting resistor 30 . Here, the voltage Vs is the voltage value from the negative terminal of the DC power supply ...

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Abstract

The purpose is to obtain a power conversion device capable of detecting the abnormality of the bootstrap circuit before starting operation without installing a voltage monitoring circuit. It has: a series circuit (10), one end of which is connected to the positive pole of the first DC power supply (1), and the other One end is connected to the negative pole of the first DC power supply (1), and the series circuit is obtained by connecting the first switching element, the second switching element, and the shunt resistor (9) in series in this order; the output part (11), which is connected to Between the first switching element and the second switching element; the first driving circuit, which drives the first switching element on and off; the second driving circuit, which complements the first switching element to turn on and off the second switching element drive; the second DC power supply (6), which is the power supply of the second drive circuit; and the capacitor (7), if the second switching element is turned on, the capacitor is charged by the second DC power supply (6), and the power The conversion device detects an abnormality of the first drive circuit by using the current of the shunt resistor (9) at the time of initial charging.

Description

technical field [0001] The present invention relates to a power conversion device capable of detecting an abnormality of a drive circuit. Background technique [0002] In a drive circuit of a conventional power conversion device, an upper-arm switching element and a lower-arm switching element are connected in series on both sides of a first DC power supply, and a capacitor used as a driving power source for the upper-arm switching element is separated by a diode. Connected to the + side of the second DC power supply, the capacitor is charged when the switching element of the lower arm is turned on, and the charge of the capacitor is consumed when the switching element of the upper arm is turned on. Also, such a circuit is called a bootstrap circuit. [0003] Patent Document 1, which is an example of prior art, discloses a technique in which the voltage of a capacitor of the bootstrap circuit is monitored by a voltage monitoring circuit, and switching is stopped when the vo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08H02M1/00
CPCH02M1/08
Inventor 江口清
Owner MITSUBISHI ELECTRIC CORP