Single-power supply IGBT negative voltage driving circuit
A technology of driving circuit and negative pressure generating circuit is applied in the field of single power supply IGBT negative pressure driving circuit, which can solve the problems of increasing the burden of driving optocoupler, IGBT cannot be turned off quickly and reliably, and achieves simple solution and low cost. , Overcome the effect of the conduction of the upper and lower arms of the IGBT
Pending Publication Date: 2021-11-12
HAIYAN LXDEER ELECTRONICS TECH
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Problems solved by technology
[0002] In IGBT drive design, for some low-power drives, based on the consideration of cost and simplified drive power design, single-supply drive technology has obvious advantages. However, when single-supply drive, IGBT cannot be turned off quickly and reliably.
The patent (CN201210299622.X) discloses a high-performance and low-cost IGBT negative voltage bootstrap drive circuit. Although it can generate negative voltage when it is turned off, the amplitude of the negative pressure is related to the carrier frequency of the PWM modulation pulse and the PWM duty cycle. Related, the charging current of the filter capacitor that generates negative pressure is generated by the output pin of the drive optocoupler when it outputs a high level, which increases the burden of driving the optocoupler
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[0019] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.
[0020] The single power supply IGBT negative voltage driving circuit proposed by the embodiment of the present invention includes the main switching power supply IGBT driving power supply winding, the IGBT low-end power supply rectification filter circuit, the IGBT low-end negative voltage generating circuit, the IGBT high-end power supply isolation generating circuit, and the IGBT high-end power supply negative voltage Generating circuit, IGBT high-end drive circuit and IGBT low-end drive circuit, the main switching power supply IGBT drive power winding is connected to IGBT low-end power rectification filter circuit and IGBT high-end power isolation generation circuit, IGBT low-end power rectification filter circuit is connected t...
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Abstract
The invention provides a single-power supply IGBT negative-voltage driving circuit. The single-power IGBT negative-voltage driving circuit specifically comprises a main switching power supply IGBT driving power supply winding, an IGBT low-end power supply rectification filter circuit, an IGBT low-end negative-voltage generating circuit, an IGBT high-end power supply isolation generating circuit, an IGBT high-end power supply negative-voltage generating circuit, an IGBT high-end driving circuit and an IGBT low-end driving circuit, the main switching power supply IGBT driving power supply winding is connected with the IGBT low-end power supply rectification filter circuit and the IGBT high-end power supply isolation generation circuit, the IGBT low-end power supply rectification filter circuit is connected with the IGBT low-end negative voltage generation circuit and the IGBT low-end driving circuit, and the IGBT high-end power supply isolation generation circuit is connected with the IGBT high-end power supply negative voltage generation circuit and the IGBT high-end driving circuit. According to the invention, the turn-on and turn-off stability of the IGBT can be ensured, and the conduction of the upper and lower bridge arms of the IGBT caused by the Miller effect can be completely overcome.
Description
technical field [0001] The invention relates to the field of IGBT driving, in particular to a single-power IGBT negative voltage driving circuit. Background technique [0002] In IGBT drive design, for some low-power drives, single-supply drive technology has obvious advantages based on cost and simplified drive power design considerations. However, when driven by a single power supply, IGBT cannot be turned off quickly and reliably. The patent (CN201210299622.X) discloses a high-performance and low-cost IGBT negative voltage bootstrap drive circuit. Although it can generate negative voltage when it is turned off, the amplitude of the negative pressure is related to the carrier frequency of the PWM modulation pulse and the PWM duty cycle. Related, the charging current of the filter capacitor that generates negative pressure is generated when the output pin of the drive optocoupler outputs a high level, which increases the burden of driving the optocoupler. Contents of the ...
Claims
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Login to View More IPC IPC(8): H02M1/088H02M1/092
CPCH02M1/088H02M1/092
Inventor 王克丰
Owner HAIYAN LXDEER ELECTRONICS TECH