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Isolated driving circuit for insulated gate power transistor in single-end converter

A drive circuit and insulated gate technology, which is applied in the drive field of insulated gate power transistors, can solve problems such as slow response, and achieve the effect of short delay time and simple circuit

Inactive Publication Date: 2008-10-29
BEIJING LMY ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Optocouplers have two disadvantages: they are slower to respond, and they require an isolated auxiliary power supply
However, when applied to single-ended converters such as forward or flyback, since the transformer can only transmit AC signals, the signal amplitude of the signal transmitted to the secondary by the isolation transformer varies linearly with the duty cycle, so in order to maintain basically the same output amplitude, only suitable for working at a duty cycle of around 50%

Method used

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  • Isolated driving circuit for insulated gate power transistor in single-end converter
  • Isolated driving circuit for insulated gate power transistor in single-end converter
  • Isolated driving circuit for insulated gate power transistor in single-end converter

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Embodiment Construction

[0035] Attached below Figure 5 The present invention is described in further detail by the non-limiting examples.

[0036] Figure 5 The middle isolation coupling unit (1) is composed of DC blocking capacitor C1 and miniature ferrite transformer B1, the right end of C1 is connected with the upper end of B1 primary, the left end of C1 and the lower end of B1 primary are the input end Vi1 of this unit, the input signal is added Here, the lower end of the B1 secondary is the common end COM, and the upper end is the output end Vo1 of the isolation coupling unit (1).

[0037] The self-sufficient power supply (2) is composed of diodes D1, D2 and capacitors C2, C3 to form a half-wave voltage doubler rectifier filter, and the left end of C2 is the input terminal Vi2 of the self-sufficient power supply unit 2, which is connected to the output terminal Vo1 of the isolation coupling unit (1); The right end of C2 is connected with the negative pole of D1 and the positive pole of D2; the ...

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Abstract

The invention consists of isolation coupling transformer, self contained source of power, preposition unit and amplifying unit. The transform is used in isolation. The self contained source of power is used in receiving energy transferred through input signal at the stage of flat top. The preposition unit is used in providing level compensation. The amplifying unit is used in amplifying and outputting the modulation signal within input signal.

Description

technical field [0001] The invention belongs to the technical field of driving power tubes in switching power supplies, in particular to the driving of insulating grid power tubes in single-ended converters. Background technique [0002] The design of high-power device drive circuit (driver) in switching power supply has always been one of the key technologies in the field of power supply. For MOSFET field effect transistors and IGBT insulated gate transistors, they have an insulated gate structure, so the static driving power is close to zero. However, since they have a large gate capacitance Cgs and amplify the drain capacitance Cdg transferred to the gate due to the Miller effect, a large dynamic driving power is required. The higher design requirement for the drive circuit is to use a circuit structure as simple as possible while satisfying its instantaneous large current drive capability. [0003] When the PWM or PFM rectangular pulse modulation signal needs to be sep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08
Inventor 陈亚宁
Owner BEIJING LMY ELECTRONICS