IGBT single-power-supply driving circuit based on bootstrap mode
A drive circuit, single power supply technology, applied in electrical components, output power conversion devices, etc., can solve problems such as misconnection, burning switch tubes, etc., to achieve novel circuit forms, prevent misdirection, and achieve the effect of isolated drive
Inactive Publication Date: 2020-01-07
BEIJING MECHANICAL EQUIP INST
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But its disadvantages are: if the output of the switch tube operates under an inductive load, the switch tube in the off state will bear a relatively high dv / dt due to the recovery process of the anti-parallel diode, and due to the Miller effect, it will pass through the switch tube. The electrode and gate parasitic capacitance discharge to the drive circuit, which may exceed the turn-on threshold voltage of the switch tube and cause false conduction, thus burning the switch tube
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[0037] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principles of the present invention.
[0038] This embodiment discloses a bootstrap-based IGBT single-supply drive circuit, such as figure 1 As shown, it includes driver chip N1, bootstrap suspension circuit, full-bridge driver circuit, and switch circuit;
[0039] The driving chip N1 of this embodiment drives and amplifies the input PWM signal, and outputs the PWM driving signal.
[0040] The driver chip N1 can be a chip such as IR2110S. The PWM signal input terminals of the drive chip N1 are pins HIN and pins LIN; the pins HIN and pins LIN are respectively connected to PWMH and PWML signals, and the PWMH and PWML signals are complementary and have a certain dead time. Output after the c...
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The invention relates to an IGBT single-power-supply driving circuit based on a bootstrap mode, belongs to the technical field of an electronic circuit and solves a problem of misconduction caused bythe Miller effect. The circuit comprises a driving chip N1 for driving and amplifying an input PWM signal and outputting a PWM driving signal, a bootstrap circuit used for providing a bootstrap floating power supply, and a full-bridge driving circuit used for outputting the PWM driving signal to a switching circuit and controlling a switching tube for being switched on or switched off, wherein thefull-bridge driving circuit clamps a driving voltage of the switching tube to a zero voltage when the switching tube has the Miller effect, so the switching tube is prevented from being mistakenly switched on. The circuit is advantaged in that the circuit is novel in form, simple in structure and low in cost, can meet the requirement of single-power-supply driving of a common switching tube, andcan be applied to various power electronic devices.
Description
technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an IGBT single power supply driving circuit based on a bootstrap mode. Background technique [0002] At present, the drive circuit of traditional IGBT (insulated gate bipolar transistor) and other switching tubes converts the PWM (pulse width modulation) signal to the appropriate level for switching tubes through the drive chip. The upper and lower tubes of the arm provide the drive signals. [0003] Traditional drive circuits can meet the needs of most occasions. However, its disadvantages are: if the output of the switching tube operates under an inductive load, the switching tube in the off state will bear a relatively high dv / dt due to the recovery process of the anti-parallel diode, and due to the Miller effect, it will pass through the switching tube. The electrode and gate parasitic capacitance discharge to the drive circuit, which may exceed the turn-on thre...
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IPC IPC(8): H02M1/088
CPCH02M1/088
Inventor 季金虎赵晓宇胡永峰
Owner BEIJING MECHANICAL EQUIP INST