DC/DC transformation topology circuit of high-voltage switch power supply

A topology circuit, high-voltage switch technology, applied in the direction of adjusting electrical variables, output power conversion devices, conversion equipment with intermediate conversion to AC, etc., can solve the problem of excessive current, impossible output power, and device selection. type difficulties and other problems, to achieve the effect of easy selection

Inactive Publication Date: 2008-07-09
SHENZHEN INVT ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the impact of power grid fluctuation +10% should also be considered, so the voltage that the switch tube bears is 1.2×1.1Ui=1.32Ui. When the input is 800V DC, even if the derating is not considered, the withstand voltage of the switch tube must also be Reaching Uceo=1.32×800=1056V, such a high-speed switching tube is difficult to choose
If the input is higher than 800V, reaching 1000V, 1200V, the device selection will be more difficult, or even no suitable device can be selected
When high voltage is input, the withstand voltage requirements of other devices in the circuit are also increased accordingly, and it is difficult to find devices that meet the requirements
Even if a suitable device is found, it will greatly reduce the reliability of the entire power supply if it works at a high voltage
In addition, the half-bridge circuit uses a transformer. If the current is too large, it will saturate it, and the output power cannot be made very large.

Method used

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  • DC/DC transformation topology circuit of high-voltage switch power supply
  • DC/DC transformation topology circuit of high-voltage switch power supply
  • DC/DC transformation topology circuit of high-voltage switch power supply

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with accompanying drawing:

[0018] refer to figure 2 , use two half-bridge converters, connect their primary sides in series and the secondary sides in parallel. Four switch tubes Q1-Q4 are connected in series, and four capacitors C1-C4 are connected in series and connected to both ends of the input voltage. The above two capacitors C1, C2, switch tubes Q1, Q2 are connected to form a half-bridge converter structure, and the energy is transmitted to the secondary side through the transformer T1. The following two capacitors C3, C4, and switching tubes Q3, Q4 are connected to form a half-bridge converter structure, and the energy is transmitted to the secondary side through the transformer T2. Among the four switching tubes, Q1 and Q3 are controlled by the same signal, and are turned on and off synchronously. When they are turned on, the pulse current flows to Q1, T1, C7, C2, Q3, T2, C8, and C4, whic...

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Abstract

The DC / DC topological circuit for high-voltage switch power comprises two semi-bridge converters every with primary side in series with four tubes (Q1-Q4) and capacitors (C1-C4) connected with input voltage Ui and the paralleled secondary side, wherein C1-C2 / C3-C4 and Q1-Q2 / Q3-Q4 form a semi-bridge structure connected with secondary side through transformer T1 / T2; Q1 / Q2 and Q3 / Q4 are controlled by same signal. This invention can be applied for higher voltage condition just by added semi-bridge converter.

Description

technical field [0001] The invention relates to a high-frequency switching power supply, and mainly refers to a DC / DC conversion topology circuit of a high-voltage switching power supply used in some DC high-voltage occasions. Background technique [0002] At present, as far as the basic pulse width adjustment (PWM) converter main circuit topology is concerned, there are Buck, Boost, Buck-Boost, Cuk and other converters. On this basis, the circuit structures of switching regulated power supplies (DC / DC converters) evolved are various. Among them, the switching tubes of the dual-tube forward and half-bridge circuits are only under the input power supply voltage, and will not There is a problem of unidirectional bias magnetic saturation, so it is widely used in high-voltage input circuits. [0003] In a half-bridge circuit (see figure 1 ), Q1 and Q2 (which can be triodes or MOS tubes, this article takes triodes as an example, the same below) are turned on in turn under the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/335
Inventor 吴建安刘小兵李斌张科孟张波
Owner SHENZHEN INVT ELECTRIC
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