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DC/DC power converter

A power conversion device and voltage technology, applied in the direction of output power conversion device, electrical components, regulating electrical variables, etc. problem, to achieve the effect of reducing power consumption

Active Publication Date: 2014-09-24
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, if the switching frequency is lowered in order to suppress switching loss, there is a problem that the current pulsation of the reactor becomes larger, and the size of the current and voltage changes becomes the cause, which increases the radiated noise and conduction noise, and causes errors in the surrounding devices and equipment. Action, the effective value of the current increases, so the loss of the reactor and wiring increases

Method used

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Embodiment approach 1

[0028] Hereinafter, the DC / DC power conversion device according to Embodiment 1 of the present invention will be described.

[0029] figure 1 The circuit configuration of the DC / DC power conversion device according to Embodiment 1 of the present invention is shown. Such as figure 1 As shown, the DC / DC power conversion device has the following DC / DC power conversion function: convert the voltage V1 input between the low-voltage voltage terminals VL and Vcom into a voltage V2 boosted above V1 and output it to the high-voltage voltage terminals VH and Vcom Between Vcom (boost operation), or convert the voltage V2 input between the high-voltage voltage terminal VH and Vcom into a voltage V1 that is stepped down below V2 and output it between the low-voltage voltage terminal VL and Vcom (step-down operation) .

[0030] The DC / DC power conversion device includes a main circuit 110 and a control circuit 120 . The main circuit 110 includes: smoothing capacitors CL, CH to smooth th...

Embodiment approach 2

[0138] Hereinafter, a DC / DC power converter according to Embodiment 2 of the present invention will be described. Part of the circuit configuration is different from the DC / DC power conversion device of Embodiment 1 above, but the control operation related to the buck-boost is basically the same.

[0139] Figure 7 A circuit configuration of a DC / DC power conversion device according to Embodiment 2 of the present invention is shown. Such as Figure 7 As shown, the DC / DC power conversion device has the following DC / DC power conversion function: the voltage V1 input between the low-voltage voltage terminals VL and VcomL is converted into a voltage V2 boosted above V1 and output to the high-voltage voltage terminals VH and VcomL Between VcomH (boost operation), or convert the voltage V2 input between the high-voltage voltage terminals VH and VcomH to a voltage V1 that is lowered to V2 or less, and output it between the low-voltage voltage terminals VL and VcomL (step-down opera...

Embodiment approach 3

[0205] In Embodiment 1, as described above, it is necessary to continuously change the switching frequency f according to Equation (14) and Equation (15) so that the magnitude of the current ripple becomes constant, and there is a problem that the control becomes complicated. In addition, at the voltage ratio k=2, the effective switching frequency f cannot be obtained from the two equations, so this is also as described. When it is desired to operate near the voltage ratio k=2, the switching frequency f needs to be Special consideration for control such as setting to an extremely small value.

[0206] Embodiment 3 of the present invention was completed in consideration of the above points. Instead of making the switching frequency f variable in accordance with the voltage ratio k, the switching frequency f is changed in several fixed types, and the reactor's When the inductance value L is set so large (without making the size of the reactor so large), the current ripple can be...

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Abstract

An object of the present invention is to provide a DC / DC power conversion device capable of reducing average power consumption in a wide range of DC voltage ratios. In order for the control circuit (120) to make the magnitude (ΔI) of the current ripple flowing through the reactor (Lc) become a predetermined constant value regardless of the voltage ratio k (k=V2 / V1) of the DC voltage conversion, according to the following formula, according to The voltage ratio k changes the switching frequency f at which the IGBTs ( S1 to S4 ) are turned on and off. In the case of 1≤k<2: f=(V1 / (2×L×ΔI))×(k-1)×(2-k) / k, in the case of k>2: f=(V1 / (2×L×ΔI))×(k-2) / k.

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] Conventional DC / DC power converters perform voltage conversion from direct current to direct current by controlling the amount of energy stored and released in a reactor by turning on and off a switching element. In addition, since the reactor has the problem of being large and heavy, a technology has been disclosed that reduces the voltage applied to the reactor by charging and discharging the capacitor, reduces the inductance value required for the reactor, and reduces the reactance. The device is small in size and light in weight (for example, refer to Patent Documents 1 and 2). [0003] Patent Document 1: Japanese Patent Application Laid-Open No. 61-92162 [0004] Patent Document 2: Japanese Patent Laid-Open No. 2005-224060 Contents of the invention [0005...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
CPCH02M3/07H02M3/158H02M7/4837
Inventor 浦壁隆浩奥田达也田中优矢小林胜池田又彦前川博敏
Owner MITSUBISHI ELECTRIC CORP
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