Power switch driving device
A power switch and drive device technology, applied in the field of power electronics, can solve problems such as increased device loss, large dispersion, unbalanced power switch voltage or current, etc.
Active Publication Date: 2010-05-12
XINFENGGUANG ELECTRONICS TECH CO LTD
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Problems solved by technology
[0002] When the traditional power switches are connected in series or in parallel, due to the inconsistency of the switching time of the power switches, the dispersion is too large, which will cause the voltage or current borne by each power switch to be unbalanced, and eventually cause the voltage borne by the power switches to exceed its capacity. , so that the power switch is broken down, because the switching speed of the power switch is extremely fast, the peak voltage and peak current generated when it is turned off are added to the power switch, and it is easier to break down the power switch
[0003] In the traditional practice, RCD snubbing circuit is generally only added to the power switch. When the switching time of the power switch is small, the peak voltage or peak current can be absorbed, and the rise of the peak voltage and current can be suppressed. , but when multiple power switches are connected in series or in parallel, the circuit is complicated, the device is also very large, and the loss of the device is also increased.
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[0017] The present invention will be specifically described below in conjunction with the accompanying drawings and specific embodiments.
[0018] attached figure 1 Shown is a circuit diagram of two power switches 1 connected in series. The power switch 1 in this drawing takes IGBT as an example. The drain of the power switch ug1 is connected to the source of ug2. If there are many power switches, they are connected in series. A control circuit 2 is installed between the gate and the drain of each power switch 1, and the control circuit 2 mainly plays the role of limiting and anti-interference. The control circuit 2 is mainly composed of two voltage regulator tubes and two resistors. Taking the power switch ug2 as an example, the positive poles of the voltage regulator tubes D1 and D2 are connected in series. After series connection, they are connected in parallel with the resistor R1. The negative pole of the voltage regulator tube D2 is connected to the power switch. The dr...
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This invention relates to a driving device of the power switch, which is composed of the control circuit, grid balance inductor and signal divider, wherein the control circuit is composed of the two voltage-stabilizer tubes and two resistance wires; one end of one resistance wire connects with the grid of the power switch, the other end connects with the output of the grid balance inductor, and the input of the grid balance inductor connects with the signal divider, the other resistance wire is connected between the grid and leaking pole; after the positive pole of the two stabilizer tubes inseries, one end connects with the grid of the power switch, and the other connects with the leaking pole of the power switch; the leaking pole of the power switch connects with the signal divider. This invention solves the voltage or current balance of the power switch.
Description
(1) Technical field [0001] The invention relates to a drive device for series or parallel power switches, belonging to the technical field of power electronics. (2) Background technology [0002] When the traditional power switches are connected in series or in parallel, due to the inconsistency of the switching time of the power switches, the dispersion is too large, which will cause the voltage or current borne by each power switch to be unbalanced, and eventually cause the voltage borne by the power switches to exceed its capacity. , so that the power switch is broken down, because the switching speed of the power switch is extremely fast, the peak voltage and peak current generated when it is turned off are added to the power switch, and it is easier to break down the power switch. [0003] In the traditional practice, RCD snubbing circuit is generally only added to the power switch. When the switching time of the power switch is small, the peak voltage or peak current c...
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IPC IPC(8): H03K17/08
Inventor 李瑞来尹彭飞
Owner XINFENGGUANG ELECTRONICS TECH CO LTD