CN209217940U

CN209217940U - A kind of passive metal-oxide-semiconductor safe driving circuit of isolating transformer centre cap

Info

Publication number: CN209217940U
Application number: CN201822053921.0U
Authority: CN
Inventors: 尤延庆; 肖俊伟
Original assignee: Hubei Ji Run Technology Co Ltd
Current assignee: Hubei Ji Run Technology Co Ltd
Priority date: 2018-12-07
Filing date: 2018-12-07
Publication date: 2019-08-06
Anticipated expiration: 2028-12-07

Abstract

The utility model relates to a kind of passive metal-oxide-semiconductor safe driving circuits of isolating transformer centre cap, including coupled capacitor C1, transformer T1, diode D1 and driving chip U1, one end of transformer T1 secondary coil is electrically connected with the anode of diode D1, the cathode of diode D1 is electrically connected with the voltage input end of driving chip U1, the electrical connection corresponding with the signal input part of driving chip U1 and ground terminal respectively of the centre cap and the other end of transformer T1 secondary coil, the voltage output end of driving chip U1 is electrically connected with the grid of metal-oxide-semiconductor, the other end of transformer T1 secondary coil is electrically connected with the ground terminal of driving circuit.After the utility model carries out transformation isolation to pulse drive signal by transformer, drive circuitry is given after rectifying by diode D1, control signal is exported simultaneously drives the drive circuit works, meet metal-oxide-semiconductor to the amplitude and waveform quality requirement of pulse drive signal, when abnormal shutdown, cutting output rapidly makes output without residual DC level, and circuit structure is simple.

Description

A kind of passive metal-oxide-semiconductor safe driving circuit of isolating transformer centre cap

Technical field

The utility model relates to electronic circuit technology field more particularly to a kind of passive MOS of isolating transformer centre cap Pipe safe driving circuit.

Background technique

Switching Power Supply is higher and higher to efficiency requirements at present, so the also complicated many of circuit, to driving circuit it is also proposed that Higher requirement.Current protocols have: 1, transformer isolation drives；2, light-coupled isolation drives.The former circuit is simple, can only adapt to frequency Rate is not high, to the occasion that waveform requirements are not tight；Latter circuit is complicated, need to separately add power supply, and cost performance is low.

Summary of the invention

Technical problem to be solved in the utility model is in view of the above shortcomings of the prior art, to provide a kind of isolation transformation The passive metal-oxide-semiconductor safe driving circuit of device centre cap.

The technical solution that the utility model solves above-mentioned technical problem is as follows: a kind of isolating transformer centre cap is passive Metal-oxide-semiconductor safe driving circuit, including coupled capacitor C1, transformer T1, diode D1 and driving chip U1, the coupled capacitor C1 One end be electrically connected with primary coil one end of the transformer T1, external pulse driving signal passes through the coupled capacitor C1's The primary coil other end of the other end and the transformer T1 access, one end of the transformer T1 secondary coil and two pole The anode electrical connection of pipe D1, the cathode of the diode D1 are electrically connected with the voltage input end of the driving chip U1, the change The centre cap of depressor T1 secondary coil is electrically connected with the signal input part of the driving chip U1, the transformer T1 secondary wire The other end of circle is electrically connected with the ground terminal of the driving chip U1, the voltage output end of the driving chip U1 and metal-oxide-semiconductor Grid electrical connection, the other end of the transformer T1 secondary coil are electrically connected with the ground terminal of the driving circuit.

The beneficial effects of the utility model are: the passive metal-oxide-semiconductor of the isolating transformer centre cap of the utility model drives safely Dynamic circuit, after carrying out transformation isolation to external pulse drive signal by transformer, to drive after being rectified by the diode D1 Dynamic circuit power supply, while exporting control signal and driving the drive circuit works, to meet metal-oxide-semiconductor to the width of pulse drive signal The requirement of degree and waveform quality, in abnormal shutdown, cutting output rapidly makes output without residual DC level, realizes that safety is driven Dynamic, circuit structure is simple, is not necessarily to additional power supply, and sexual valence is relatively high.

Based on the above technical solution, the utility model can also do following improvement:

Further, the passive metal-oxide-semiconductor safe driving circuit of the isolating transformer centre cap further includes filter capacitor C2, The cathode of the diode D1 is electrically connected by the filter capacitor C2 with the other end of the transformer T1 secondary coil.

The beneficial effect of above-mentioned further scheme is: passing through change by what the filter capacitor C2 can export transformer Pulse drive signal after pressure isolation is filtered after diode D1 rectification, to provide more for the driving circuit Stable power supply, it is ensured that the work of driving circuit normal table.

Detailed description of the invention

Fig. 1 is the passive metal-oxide-semiconductor safe driving circuit structural schematic diagram of isolating transformer centre cap of the utility model.

Specific embodiment

The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining that this is practical It is novel, it is not intended to limit the scope of the utility model.

As shown in Figure 1, a kind of passive metal-oxide-semiconductor safe driving circuit of isolating transformer centre cap, including coupled capacitor C1, Transformer T1, diode D1 and driving chip U1,

One end of the coupled capacitor C1 is electrically connected with primary coil one end of the transformer T1, external pulse driving letter It number is accessed by the primary coil other end of the other end of the coupled capacitor C1 and the transformer T1, transformer T1 times One end of grade coil is electrically connected with the anode of the diode D1, the electricity of the cathode of the diode D1 and the driving chip U1 Input terminal electrical connection is pressed, the centre cap of the transformer T1 secondary coil and the signal input part of the driving chip U1 are electrically connected It connects, the other end of the transformer T1 secondary coil is electrically connected with the ground terminal of the driving chip U1, the driving chip U1 Voltage output end be electrically connected with the grid of metal-oxide-semiconductor, the other end of the transformer T1 secondary coil and the driving circuit Ground terminal electrical connection.

The passive metal-oxide-semiconductor safe driving circuit of the isolating transformer centre cap of the utility model, by transformer to outside After pulse drive signal carries out transformation isolation, to drive circuitry after rectifying by the diode D1, while control is exported Signal drives the drive circuit works, to meet metal-oxide-semiconductor to the amplitude of pulse drive signal and the requirement of waveform quality, different When normally-off, cutting output rapidly makes output without residual DC level, realizes safety driving, and circuit structure is simple, without additional Power supply, sexual valence are relatively high.

Preferably, in embodiment provided by the utility model, the passive metal-oxide-semiconductor peace of the isolating transformer centre cap Full driving circuit further includes filter capacitor C2, and the cathode of the diode D1 passes through the filter capacitor C2 and transformer T1 The other end of secondary coil is electrically connected.The arteries and veins after transformation is isolated that transformer can be exported by the filter capacitor C2 Driving signal is rushed to be filtered after diode D1 rectification, to provide more stable power supply for the driving circuit, Ensure the work of driving circuit normal table.

In embodiment provided by the utility model, the driving circuit can be using models such as Ixdn602 or mic4422 Driving chip U1.

The passive metal-oxide-semiconductor safe driving circuit of isolating transformer centre cap provided by the utility model, pulse drive signal By the primary coil of driving transformer T1 after coupled capacitor C1, the secondary coil of transformer is coupled to by electrical isolation.? Secondary coil exports the pulse drive signal progress that (Gao Bianduan) driving diode D1 is coupled to transformer T1 secondary coil all the way Rectification, and power supply is provided to driving circuit；Another output (centre cap) provides input signal for the driving circuit, directly Driving chip work, the output end driving metal-oxide-semiconductor work of last driving circuit.

The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model Within the scope of shield.

Claims

1. a kind of passive metal-oxide-semiconductor safe driving circuit of isolating transformer centre cap, it is characterised in that: including coupled capacitor C1, Transformer T1, diode D1 and driving chip U1,

One end of the coupled capacitor C1 is electrically connected with primary coil one end of the transformer T1, and external pulse driving signal is logical The primary coil other end of the other end and the transformer T1 of crossing the coupled capacitor C1 accesses, the transformer T1 secondary wire One end of circle is electrically connected with the anode of the diode D1, and the cathode of the diode D1 and the voltage of the driving chip U1 are defeated Entering end electrical connection, the centre cap of the transformer T1 secondary coil is electrically connected with the signal input part of the driving chip U1, The other end of the transformer T1 secondary coil is electrically connected with the ground terminal of the driving chip U1, the electricity of the driving chip U1 Pressure output end is electrically connected with the grid of metal-oxide-semiconductor, the other end of the transformer T1 secondary coil and the ground connection of the driving circuit End electrical connection.

2. the passive metal-oxide-semiconductor safe driving circuit of isolating transformer centre cap according to claim 1, it is characterised in that: It further include filter capacitor C2, the cathode of the diode D1 passes through the filter capacitor C2 and the transformer T1 secondary coil Other end electrical connection.