IGBT protection circuit based on numerical control lathe servo driver
A servo driver and drive circuit technology, applied in emergency protection circuit devices, electrical components, electronic switches, etc., can solve the problems of unclear short-circuit alarm range, affecting the normal operation of the system, damage to IGBT modules, etc., to achieve low price, processing and debugging. Convenience and improved accuracy
Pending Publication Date: 2019-11-19
ZHONGZHI NANJING ELECTRIC CO LTD
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Problems solved by technology
[0002] IGBT, as a power semiconductor switching device, is being widely used in the high-power field. During application, if the IGBT is short-circuited, it will not only affect the normal operation of the entire system, but also damage the IGBT module and endanger the entire power system.
[0003] The traditional IGBT short-circuit detection circuit is judged by detecting the voltage value between the UCEs of the IGBT components during a short circuit, while most of the traditional detection circuits only use a diode to collect the voltage between the UCEs, the circuit structure is simple, and it is easy to appear False alarm phenomenon, thus affecting the normal operation of the entire system
[0004] The traditional IGBT short-circuit detection circuit cannot achieve the function of adjusting the short-circuit voltage threshold, and its short-circuit alarm range is not clear, which is prone to inaccuracy
Method used
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[0019] Depend on figure 1 A kind of IGBT protection circuit based on CNC lathe servo driver is shown, including IGBT circuit, U-phase drive circuit, V-phase drive circuit, W-phase drive circuit and short-circuit detection circuit, IGBT circuit includes several IGBT components, U-phase drive circuit , The V-phase drive circuit and the W-phase drive circuit are used to drive the IGBT circuit;
[0020] The IGBT circuit in this embodiment is used to drive a three-phase servo driver. The IGBT circuit package is composed of 6 IGBT elements. The IGBT circuit is a prior art, so it will not be described in detail.
[0021] The U-phase drive circuit, the V-phase drive circuit and the W-phase drive circuit of the present invention are all composed of IGBT-driven optocouplers and their peripheral circuits. Pin 5 of the IGBT-driven optocouplers is the output control terminal, and the model of the IGBT-driven optocouplers is PS9031.
[0022] Such as figure 1 As shown, this embodiment take...
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The invention discloses an IGBT protection circuit based on a numerical control lathe servo driver. The invention belongs to the technical field of IGBTs, the IGBT protection circuit comprises an IGBTcircuit, a U-phase drive circuit, a V-phase drive circuit, a W-phase drive circuit and a short circuit detection circuit. The IGBT circuit comprises a plurality of IGBT elements. The U-phase drive circuit, the V-phase drive circuit and the W-phase drive circuit are used for driving the IGBT circuit. The technical problem of accurately judging the short circuit phenomenon of the IGBT circuit is solved. According to the IGBT protection circuit, a mode of adding the fast recovery diode at the output end of an IGBT driving optocoupler is adopted; the IGBT drive optocoupler can adjust the judgmentthreshold of the short-circuit voltage and improve the accuracy of judging the short-circuit phenomenon, and the anti-interference capacitor is additionally arranged at the output end of the comparator, so that the output accuracy of the comparator is greatly improved.
Description
technical field [0001] The invention belongs to the technical field of IGBTs, in particular to an IGBT protection circuit based on a CNC lathe servo driver. Background technique [0002] IGBT, as a power semiconductor switching device, is being widely used in the high-power field. During application, if the IGBT is short-circuited, it will not only affect the normal operation of the entire system, but also damage the IGBT module and endanger the entire power system. [0003] The traditional IGBT short-circuit detection circuit is judged by detecting the voltage value between the UCEs of the IGBT components during a short circuit, while most of the traditional detection circuits only use a diode to collect the voltage between the UCEs, the circuit structure is simple, and it is easy to appear The phenomenon of false alarms will affect the normal operation of the entire system. [0004] The traditional IGBT short-circuit detection circuit cannot achieve the function of adjust...
Claims
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Login to View More IPC IPC(8): H03K17/082H02H7/20
CPCH03K17/0828H02H7/205
Inventor 江华
Owner ZHONGZHI NANJING ELECTRIC CO LTD