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power conversion device

A power conversion device and potential technology, applied in the direction of high-efficiency power electronic conversion, output power conversion device, electrical components, etc., to achieve the effect of simplifying the control circuit

Active Publication Date: 2016-09-14
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, although the potential at one end of the shunt resistor 1005 becomes a voltage lower than the reference potential, it is inverted and amplified by the operational amplifier circuit 2001, and when it is input to the control circuit 1010, it must be converted to a voltage higher than the reference potential.

Method used

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Experimental program
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Embodiment approach 1

[0042] figure 1 It is a block diagram showing the overall circuit of the power conversion device according to the first embodiment of the present invention.

[0043] in figure 1 The AC power supply 1001 is connected to the diode bridge 1003 for rectification. The positive side of the rectified output is connected to a semiconductor switch 1006 and a diode 1007 via a reactor 1004. The other end of the diode 1007 is connected to a smoothing capacitor 1008. On the other hand, the negative side of the rectified output is connected to a semiconductor switch 1006 and a smoothing capacitor 1008 via a shunt resistor 1005. With these circuits, the output of AC power supply 1001 is rectified and smoothed to form a substantially DC power supply. In particular, by turning on and off the semiconductor switch 1006, current can also flow from the AC power source 1001 during the period when the voltage of the AC power source 1001 is low, which can improve the power factor of the power source...

Embodiment approach 2

[0064] figure 2 It is a circuit block diagram of the power conversion device according to the second embodiment of the present invention. in figure 2 In the above, the basic operations and the like are the same as those of the first embodiment, and only the differences are explained.

[0065] The first difference is that in the negative feedback system of operational amplifier circuits 1101 and 1201, capacitors 1107 and 1207 are provided in parallel with resistors 1104 and 1204. With such a design, it is possible to further increase the characteristics of attenuating the high-frequency components of the inversion and level shift circuits of the operational amplifier circuits 1101 and 1201.

[0066] The second difference is that in the differential circuit of the operational amplifier circuit 1301, capacitors are provided in parallel with the resistors 1303 and 1305. By designing in this way, high-frequency components can be attenuated in the differential circuit.

[0067] That ...

Embodiment approach 3

[0069] use figure 2 The third embodiment of the present invention will be described. The basic operation is the same as in the first and second embodiments, so it is omitted.

[0070] in figure 2 Here, the output voltage of the inversion / level shift circuit 1101 is expressed by (Equation 1), and the gain Av_1 with respect to the input voltage is expressed by the following equation.

[0071] Av1=R1104 / (R1102+R1103)

[0072] (Equation 3)

[0073] Similarly, the output voltage of the inversion / level shift circuit 1201 is expressed by (Expression 2), and the gain Av_2 with respect to the input voltage is expressed by the following expression.

[0074] Av2=R1204 / (R1202+R1203)

[0075] (Equation 4)

[0076] According to equations 1 and 2, the output of the inversion and level shift circuit is related to the gain of each circuit. When the potential at both ends of the resistor for current detection is disordered, if the gain is large, the output of the inverting and level shifting circuit ...

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Abstract

The present invention provides a power conversion device, which converts AC power to DC to drive a DC load, or further converts the DC to an analog AC of arbitrary frequency and amplitude to drive an AC load, wherein, on the negative side of the rectifier diode bridge A resistor is inserted between the output terminal of the power factor and the semiconductor switch circuit for power factor improvement, and both ends of the resistor are respectively connected to an inversion / level shift circuit for performing inversion and level shifting, and by inputting each Inverting the output of the level shift circuit, acquiring current detection information as an output of the operation circuit, and performing on-off control of the semiconductor switch circuit using the current detection information.

Description

Technical field [0001] The present invention relates to a device for converting AC power to DC to drive a DC load, and a power conversion device for converting AC power to DC and further to another AC to drive an AC load. The present invention particularly relates to a power conversion device, which is suitable for rectifying AC such as a single-phase AC power source such as a home into a substantially DC, and using a converter circuit to convert the obtained DC to AC of any frequency again, so as to perform power conversion on a load such as a motor. The variable-speed drive constitutes, for example, a heat pump equipped with a compressor that compresses the coolant, and performs cooling, heating, or freezing of food. The power conversion device of the present invention is provided with a control circuit having a simple configuration, and realizes the reduction of the harmonic components contained in the power supply current and the improvement of the power factor. Background ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12
CPCH02M1/4225G01R19/0092Y02B70/10H02M1/0009
Inventor 戴鑫徽土山吉朗京极章弘吉田泉川崎智广
Owner PANASONIC CORP
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