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Dc/DC power converting apparatus

A power conversion device and circuit technology, which is applied to output power conversion devices, electrical components, charge balance circuits, etc., can solve problems such as hindering high efficiency and diode conduction loss, and achieve the effect of reducing conduction loss and large power conversion.

Inactive Publication Date: 2009-08-26
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conduction loss occurs in the diode used in the rectifier circuit, which prevents high efficiency

Method used

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  • Dc/DC power converting apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0039] Hereinafter, a DC / DC power converter according to Embodiment 1 of the present invention will be described with reference to the drawings. figure 1 , figure 2 The circuit configuration of the DC / DC power conversion device according to Embodiment 1 of the present invention is shown, especially figure 1 shows the main part, figure 2 The gate signal generation part is shown.

[0040] like figure 1 As shown, the DC / DC power conversion device has a function of converting the voltage V1 input between the voltage terminals VL and Vcom into a voltage V2 boosted by about 4 times, and outputting it between the voltage terminals VH and Vcom.

[0041] The main circuit part of the DC / DC power conversion device is configured by connecting circuits A1, A2, A3, and A4 in series. The circuits A1, A2, A3, and A4 include smoothing capacitors Cs1, Cs2, Cs3, and Cs4 and a plurality of MOSFETs. The smoothing capacitors Cs1, Cs2, Cs3, and Cs4 smooth the input and output voltages V1, V2, ...

Embodiment approach 2

[0073] In Embodiment 1 above, a step-up DC / DC power converter that boosts the voltage V1 to approximately four times the voltage V2 was shown, but in this embodiment, the step-down from the voltage V2 to the voltage V2 is shown. Step-down DC / DC power conversion device of V1.

[0074] The main part of the circuit configuration of the DC / DC power converter of the present embodiment and figure 1 The shown circuit configurations are the same, but in this case, the circuit A4 is used for the drive inverter circuit, and the circuits A1, A2, and A3 are used for the rectifier circuit. In addition, the control circuit 13a as the gate signal generation part is different from the above-mentioned first embodiment, as Figure 5 shown.

[0075] like Figure 5 As shown, gate signals Gate1L, Gate1H, Gate2L, Gate2H, Gate3L, Gate3H, Gate4L, Gate4H are generated in the control circuit 13a. In the control circuit 13a, there are: a drive gate signal generation section 130B for generating drive...

Embodiment approach 3

[0106] The step-up DC / DC power converter of V1→V2 is shown in the first embodiment above, and the step-down DC / DC power converter of V2→V1 is shown in the second embodiment above, but in this embodiment In the form, a buck-boost type DC / DC power conversion device is shown which realizes bidirectional energy transfer by having the functions of Embodiments 1 and 2 described above at the same time.

[0107] The main part of the circuit configuration of the DC / DC power converter of this embodiment is the same as that of the first and second embodiments described above. figure 1 The circuit configuration shown in , in this case, circuit A1 is used as an inverter circuit for driving when boosting voltage, circuits A2, A3, and A4 are used as a rectifier circuit, and circuit A4 is used as a driving circuit when voltage is lowered. Using the inverter circuit, use the circuits A1, A2, A3 for the rectification circuit. In addition, the control circuit 13b as the gate signal generation p...

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Abstract

The present invention provides a DC / DC power converting apparatus. Three or more circuits (A1-A4), in which series-connected low-voltage and high-voltage side switches made of MOSFETs having parasitic diodes are connected across positive and negative terminals of each of smoothing capacitors (Cs1-Cs4), are connected in series. One of elementary series circuits, each including a capacitor (Cr) and an inductor (Lr), is disposed between any adjacent two of the circuits with the elementary series circuits set to have the same period of resonance. The MOSFETs of rectifier circuits (A2-A4) are brought into an ON state simultaneously with the MOSFETs of a driving inverter circuit (A1) and brought into an OFF state earlier than the MOSFETs of the driving inverter circuit (A1) by a period of time not exceeding a time period (t) equal to (period of resonance) / 2. With this arrangement, a resonance phenomenon of the capacitor (Cr) and the inductor (Lr) is used and conduction loss in the rectifier circuits (A2-A4) is reduced in DC / DC power conversion performed through charging and discharging operation of the capacitor (Cr).

Description

technical field [0001] The present invention relates to a DC / DC power conversion device for converting a direct current voltage into a boosted or stepped down direct current voltage. Background technique [0002] A DC / DC converter, which is a conventional DC / DC power conversion device, is composed of an inverter circuit and a multiple voltage rectification circuit. The inverter circuit has a semiconductor switch connected to a positive potential and a semiconductor switch connected to a negative potential. At least two or more semiconductor switches of the semiconductor switch, the multiple voltage rectification circuit has a plurality of rectifiers connected in series and a plurality of capacitors connected in series, the DC / DC converter uses an inverter circuit to generate AC voltage, and uses multiple The voltage doubler rectifier circuit generates a high-voltage DC voltage and supplies it to a load (for example, refer to Patent Document 1). [0003] In addition, the swi...

Claims

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Application Information

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IPC IPC(8): H02M3/07H02M7/48
CPCH02M3/158H02J7/0016H02M2001/0077H02M1/0077
Inventor 浦壁隆浩池田又彦岩田明彦安西清治前川博敏菊永敏之小林胜奥田达也
Owner MITSUBISHI ELECTRIC CORP
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