CN104577954B - Transformer short-circuit protects circuit - Google Patents

Transformer short-circuit protects circuit Download PDF

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Publication number
CN104577954B
CN104577954B CN201310500655.0A CN201310500655A CN104577954B CN 104577954 B CN104577954 B CN 104577954B CN 201310500655 A CN201310500655 A CN 201310500655A CN 104577954 B CN104577954 B CN 104577954B
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module
divider resistance
voltage detection
triode
detection module
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CN201310500655.0A
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CN104577954A (en
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周明杰
王现中
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Abstract

When transformer short-circuit protects circuit to detect primary or secondary coil short circuit by first voltage detection module and second voltage detection module, voltage that transformer secondary coil output end is exported by division module.In primary coil short circuit, second voltage detection module receives high level cut-off.First voltage detection module receives high level and is connected and controls the conducting of voltage pull-down module, to drag down switch module input terminal voltage so that switch module cut-off stops to load supplying.In secondary coil short circuit, first voltage detection module, which receives low level, to be ended and controls the cut-off of voltage pull-down module, second voltage detection module receives low level and is connected and exports low level to the input terminal of switch module, switch module ends and stops to load supplying, so as to when there is short circuit in the secondary coil of transformer or primary coil, stop, to load supplying, avoiding the occurrence of overcurrent, over-pressed and under-voltage phenomenon damages load.

Description

Transformer short-circuit protects circuit
Technical field
The present invention relates to transformer protection circuits, stop when more particularly to a kind of primary or secondary coil short circuit Circuit is protected to the transformer short-circuit of load supplying.
Background technology
For transformer when by sudden short circuit, high and low pressure side all will be by prodigious short circuit current.Have little time to break in breaker In the very short time opened, short circuit current can be exported to load via rectification circuit and then be damaged to load.Meanwhile in short circuit In the process, output also will appear too high or too low phenomenon to the pressure drop of load.For example, when output voltage is excessively high, can burn negative Carry, such as burn electrical equipment, and it is too low cause load cisco unity malfunction.And then therefore load is damaged, transformer exists When by sudden short circuit, output is excessively high to the overtension of load or too low and electric current, can all damage load.
Invention content
Based on this, stop protecting the transformer short-circuit of load supplying when a kind of primary or secondary coil short circuit are provided Protection circuit.
A kind of transformer short-circuit protection circuit, is used in the primary coil or secondary coil short circuit of transformer, stopping pair Load supplying, including division module, first voltage detection module, second voltage detection module, voltage pull-down module and switching molding Block;
The power supply of the input terminal of the division module, the power end of the first voltage detection module and the switch module End connects the output end of the secondary coil of transformer respectively, and the first output end and second output terminal of the division module meet institute respectively State the input terminal of the input terminal and the second voltage detection module of first voltage detection module;The ground connection of the division module The ground terminal at end, the ground terminal of the second voltage detection module and the voltage pull-down module is grounded respectively;First electricity The output of detection module is pressed to terminate the input terminal of the voltage pull-down module, the output end of the second voltage detection module and institute The output end for stating voltage pull-down module connects the input terminal of the switch module, the output terminating load of the switch module respectively;
In the transformer short circuit, the first output end and the second output terminal output of the division module are high Level, the first voltage detection module receive high level and are connected and export high level, and the second voltage detection module receives High level ends, after the voltage pull-down module receives high level conducting, by the voltage pull-down of the input terminal of the switch module, When the input terminal of the switch module is low level, the switch module cut-off stops to load supplying;
In the transformer secondary coil short circuit, the first output end and the second output terminal output of the division module are low Level, the first voltage detection module receive low level and end and control the voltage pull-down module cut-off, second electricity Pressure detection module receives low level and is connected and exports low level, when the input terminal of the switch module is low level, the switch Module is ended, and is stopped to load supplying.
Further include rectification filtering module in one of the embodiments, the rectification filtering module includes rectifier diode The anode of D1 and filter capacitor C1, the rectifier diode D1 connect the output end of the transformer secondary coil, the rectification two The cathode of pole pipe D1 connects the power end of the first voltage detection module and the power end of the switch module, the filter capacitor C1 mono- terminates the cathode of the rectifier diode D1, other end ground connection.
Further include the indicating module for being used to indicate load normal work, the indicating module in one of the embodiments, Input terminate the output end of the switch module, the output end ground connection of the indicating module.
The indicating module includes divider resistance R8 and LED1 in one of the embodiments, the divider resistance R8 with The LED1 is series between the output end and ground connection of the switch module.
The division module includes divider resistance R1, divider resistance R2 and divider resistance R3 in one of the embodiments, The divider resistance R1, the divider resistance R2 and the divider resistance R3 be series at the transformer secondary coil output end with Between ground connection, the points of common connection of the divider resistance R1 and divider resistance R2 is the first output of the division module End, the points of common connection of the divider resistance R2 and divider resistance R3 is the second output terminal of the division module, described The one end of divider resistance R1 far from the divider resistance R2 is the power end of the division module, and the divider resistance R3 is far from institute The one end for stating divider resistance R2 is the ground terminal of the division module.
The first voltage detection module includes triode Q1 in one of the embodiments, the base of the triode Q1 Pole, collector and emitter correspond to input terminal, power end and the output end of the first voltage detection module.
The second voltage detection module includes triode Q2 and divider resistance R7 in one of the embodiments, described The base stage and emitter of triode Q2 corresponds to the input terminal and output end of the second voltage detection module, the triode Q2 Collector meet the divider resistance R7, the other end ground connection of the divider resistance R7.
The voltage pull-down module includes divider resistance R4, divider resistance R5 and triode in one of the embodiments, Q4, the divider resistance R4 and the divider resistance R5 are series between the base stage and ground connection of the triode Q4, the partial pressure The points of common connection of the resistance R4 and divider resistance R5 is the input terminal of the voltage pull-down module, the hair of the triode Q4 Emitter grounding, the output end of the extremely described voltage pull-down module of current collection of the triode Q4.
The switch module includes divider resistance R6 and triode Q3, the divider resistance in one of the embodiments, R6 is series between the base stage and collector of the triode Q3, and the base stage of the triode Q3, collector and emitter correspond to For the input terminal, power end and output end of the switch module.
Above-mentioned transformer short-circuit protection circuit detects transformation by first voltage detection module and second voltage detection module When device is primary or secondary coil short circuit, voltage that transformer secondary coil output end is exported by division module.In primary coil When short-circuit, second voltage detection module receives high level cut-off.First voltage detection module receives high level and is connected and controls Voltage pull-down module conducting processed, to drag down switch module input terminal voltage so that switch module cut-off stops to load supplying. In secondary coil short circuit, first voltage detection module receive low level end and control voltage pull-down module cut-off, second Voltage detection module receives low level and is connected and exports low level to the input terminal of switch module, switch module cut-off and stopping pair Load supplying, so as to when short circuit occur in the secondary coil of transformer or primary coil, stop, to load supplying, avoiding out Existing overcurrent, over-pressed and under-voltage phenomenon damage load.
Description of the drawings
Fig. 1 is the module map that transformer short-circuit protects circuit;
Fig. 2 is the schematic diagram that transformer short-circuit protects circuit.
Specific implementation mode
As shown in Figure 1, protecting the module map of circuit for transformer short-circuit.
A kind of transformer short-circuit protection circuit, is used in the primary coil or secondary coil short circuit of transformer, stopping pair Load supplying, including division module 101, first voltage detection module 103, second voltage detection module 105, voltage pull-down module 107 and switch module 109.
The input terminal of the division module 101, the power end of the first voltage detection module 103 and the switch module 109 power end connects the output end of the secondary coil of transformer respectively, the first output end of the division module 101 and second defeated Outlet connects the input terminal of the input terminal and the second voltage detection module 105 of the first voltage detection module 103 respectively;Institute State the ground terminal of division module 101, the ground terminal of the second voltage detection module 105 and the voltage pull-down module 107 Ground terminal is grounded respectively;The output of the first voltage detection module 103 terminates the input terminal of the voltage pull-down module 107, The output end of the second voltage detection module 105 and the output end of the voltage pull-down module 107 connect the switching molding respectively The input terminal of block 109, the output terminating load of the switch module 109.
In the transformer short circuit, the first output end and second output terminal of the division module 101 are defeated Go out high level, the first voltage detection module 103 receives high level and is connected and exports high level, and the second voltage detects mould Block 105 receives high level cut-off, after the voltage pull-down module 107 receives high level conducting, by the defeated of the switch module 109 Enter the voltage pull-down at end, when the input terminal of the switch module 109 is low level, the switch module 109 ends, and stops to negative Carry power supply.
In the transformer secondary coil short circuit, the first output end and second output terminal of the division module 101 are defeated Going out low level, the first voltage detection module 103 receives low level and ends and control the cut-off of voltage pull-down module 107, The second voltage detection module 105 receives low level and is connected and exports low level, and the input terminal of the switch module 109 is low When level, the switch module 109 ends, and stops to load supplying.
First voltage detection module is given in output after the voltage that division module 101 is used to export transformer secondary coil 103 and second voltage detection module 105.Specifically, in transformer short circuit, division module 101 is secondary by transformer The voltage of grade coil output is opposite high level;In transformer secondary coil short circuit, 101 transformer secondary output of division module The voltage of coil output is relatively low-level.
First voltage detection module 103 is used to detect the first output end level of division module 101, and according to the first output The level at end controls the conducting and cut-off of itself.When 103 input terminal voltage of first voltage detection module is high level, first voltage Detection module 101 is connected, and exports high level;When 103 input terminal level of first voltage detection module is low level, first voltage Detection module 101 ends, and exports low level.
Second voltage detection module 105 is used to detect the second output terminal level of division module 101, and according to the second output The level at end controls the conducting and cut-off of itself.When 105 input terminal voltage of second voltage detection module is high level, second voltage Detection module 105 ends, and exports low low level;When 105 input terminal level of second voltage detection module is high level, the second electricity Detection module 105 is pressed to be connected so that switch module 109 is connected back by being formed between second voltage detection module 105 and ground connection Road.
Voltage pull-down module 107 be used for the level that export according to first voltage detection module 103 control the conducting of itself and Cut-off.When first voltage detection module 103 exports high level, voltage pull-down module 107 is connected, so that switch module 109 By forming conducting circuit between voltage pull-down module 107 and ground connection.When first voltage detection module 103 exports low level, electricity Pressure drags down the cut-off of module 107.
Switch module 109 is used for the on or off control according to voltage pull-down module 107 or second voltage detection module 105 Make the on or off of itself.Wherein, it as long as voltage pull-down module 107 or second voltage detection module 105 export high level, opens Module 109 is closed just to end.When only having voltage pull-down module 107 to end simultaneously with second voltage detection module 105, switch module 109 could be connected.
Incorporated by reference to Fig. 2.
Division module 101 includes divider resistance R1, divider resistance R2 and divider resistance R3, the divider resistance R1, described The divider resistance R2 and divider resistance R3 is series between the transformer secondary coil output end and ground connection, the partial pressure electricity The points of common connection for hindering the R1 and divider resistance R2 is the first output end of the division module 101, the divider resistance R2 Points of common connection with the divider resistance R3 is the second output terminal of the division module 101, and the divider resistance R1 is separate One end of the divider resistance R2 is the power end of the division module 101, and the divider resistance R3 is far from the divider resistance One end of R2 is the ground terminal of the division module 101.
First voltage detection module 103 includes the base stage of triode Q1, the triode Q1, collector and emitter correspondence For input terminal, power end and the output end of the first voltage detection module 103.
Triode Q1 is NPN type triode.
Second voltage detection module 105 includes triode Q2 and divider resistance R7, the base stage of the triode Q2 and transmitting Pole corresponds to the input terminal and output end of the second voltage detection module 105, and the collector of the triode Q2 connects described point The other end of piezoresistance R7, the divider resistance R7 are grounded.
Triode Q2 is PNP type triode.
Voltage pull-down module 107 includes divider resistance R4, divider resistance R5 and triode Q4, the divider resistance R4 and institute It states divider resistance R5 to be series between the base stage and ground connection of the triode Q4, the divider resistance R4 and divider resistance R5 Points of common connection be the voltage pull-down module 107 input terminal, the triode Q4 emitter ground connection, the triode The output end of the current collection of the Q4 extremely voltage pull-down module 107.
Triode Q4 is NPN type triode.
Switch module 109 includes that divider resistance R6 and triode Q3, the divider resistance R6 are series at the triode Q3 Base stage and collector between, the base stage of the triode Q3, collector and emitter correspond to the defeated of the switch module 109 Enter end, power end and output end.
Triode Q3 is NPN type triode.
Transformer short-circuit protection circuit further includes rectification filtering module 111, and the rectification filtering module 111 includes rectification two The anode of pole pipe D1 and filter capacitor C1, the rectifier diode D1 connect the output end of the transformer secondary coil, described whole The cathode of stream diode D1 meets the power end of the first voltage detection module 103 and the power end of the switch module 109, institute State the cathode that filter capacitor C1 mono- terminates the rectifier diode D1, other end ground connection.
Transformer short-circuit protection circuit further includes the indicating module 113 for being used to indicate load normal work, the instruction mould The input of block 113 terminates the output end of the switch module 109, the output end ground connection of the indicating module 113.
Indicating module 113 includes divider resistance R8 and LED1, and the divider resistance R8 and LED1 is series at described open Between the output end and ground connection that close module 109.LED1 is green LED.
Based on above-mentioned all embodiments, the operation principle of transformer short-circuit protection circuit is:
The primary coil of transformer T1 connects the firewire and zero curve of AC power respectively.Secondary coil one end is grounded, the other end The power supply after transformation is exported to rectifier diode D1, rectified diode D1 rectifications and the filtered power supply outputs of filter capacitor C1 To divider resistance R1, triode Q1 and triode Q3.
When transformer T1 normal work, after divider resistance R1, divider resistance R2 and divider resistance R3 partial pressures, divider resistance R1 Points of common connection and the points of common connection of divider resistance R2 and divider resistance R3 difference the output phase with divider resistance R2 is to high electricity It is gentle relatively low-level.Triode Q1 cut-offs, triode Q2 cut-offs.When triode Q1 cut-offs, the emitter output of triode Q1 Low level, and then after the base stage of triode Q4 receives low level, triode Q4 cut-offs.Thus triode Q3 base stage via point Piezoresistance R6 is connect with the cathode of rectifier diode D1, i.e. the base stage of triode Q3 connects input power, triode Q3 conductings, load Receive power supply, works normally.Meanwhile LED1 is connect by divider resistance R8 with the emitter of triode Q3, there is electric current in LED1 By LED1 shines.Show circuit at this time normally to load supplying.
When the primary coil short circuit of transformer T1, armature winding the number of turns is reduced, and transformer T1 secondary voltages increase.Secondary electrical Pressure is exported via rectifier diode D1 rectifications and the filtered power supplys of filter capacitor C1 to divider resistance R1, triode Q1 and three poles Pipe Q3.Wherein, after divider resistance R1, divider resistance R2 and divider resistance R3 are divided, the public affairs of divider resistance R1 and divider resistance R2 Tie point and the points of common connection of divider resistance R2 and divider resistance R3 distinguish the output phase to high level altogether.Triode Q1 receives high Electric conducts, triode Q2 end when receiving high level.When triode Q1 conductings, the high electricity of emitter output of triode Q1 It is flat, it is exported via divider resistance R5 and gives triode Q4, triode Q4 receives high level conducting, and therefore, the base stage of triode Q3 passes through It is grounded by triode Q4, the base voltage of triode Q3 is pulled low, triode Q3 cut-offs.Stop to load supplying.LED1 does not have There are electric current process, LED1 to extinguish.
When the secondary coil short circuit of transformer T1, primary coil umber of turn is constant, and secondary coil umber of turn tails off, and becomes The secondary voltage of depressor T1 reduces.Secondary voltage is exported via rectifier diode D1 rectifications and the filtered power supplys of filter capacitor C1 To divider resistance R1, triode Q1 and triode Q3.Wherein, after divider resistance R1, divider resistance R2 and divider resistance R3 are divided, Points of common connection and the points of common connection of divider resistance R2 and divider resistance the R3 difference of divider resistance R1 and divider resistance R2 is defeated Go out relatively low-level.Triode Q1 base stages are ended when receiving low level, and triode Q2 base stages are connected when receiving low level.Triode When Q1 ends, emitter exports low level, thus the triode Q4 cut-offs that base stage is connect with triode Q1 emitters.Triode Q2 After conducting, the base stage of triode Q3 connects to form earth-return circuit by triode Q2, thus the base level of triode Q3 is drawn Low, triode Q3 base stages receive low level cut-off.Stop to load supplying.LED1 does not have electric current process, LED1 to extinguish.
Above-mentioned transformer short-circuit protection circuit is examined by first voltage detection module 103 and second voltage detection module 105 Survey primary or when secondary coil short circuit, the voltage that transformer secondary coil output end is exported by division module 101. When primary coil short circuit, second voltage detection module 105 receives high level cut-off.First voltage detection module 103 receives High level is connected and controls the conducting of voltage pull-down module 107, to drag down 109 input terminal voltage of switch module so that switching molding The cut-off of block 109 stops to load supplying.In secondary coil short circuit, first voltage detection module 103 receives low level cut-off And the cut-off of voltage pull-down module 107 is controlled, second voltage detection module 105 receives low level and is connected and exports low level to switch The input terminal of module 109, the cut-off of switch module 109 and stops to load supplying, so as in the secondary coil of transformer or When short circuit occurs in primary coil, stop, to load supplying, avoiding the occurrence of overcurrent, over-pressed and under-voltage phenomenon damages load.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (8)

1. a kind of transformer short-circuit protects circuit, in the primary coil or secondary coil short circuit of transformer, stopping to negative Carry power supply, which is characterized in that including division module, first voltage detection module, second voltage detection module, voltage pull-down mould Block, switch module and the indicating module for being used to indicate load normal work;
The power end of the input terminal of the division module, the power end of the first voltage detection module and the switch module point The output end of the secondary coil of transformer is not connect, and the first output end and second output terminal of the division module connect described respectively The input terminal of the input terminal of one voltage detection module and the second voltage detection module;The ground terminal of the division module, institute State the output end difference of the ground terminal of second voltage detection module, the ground terminal of the voltage pull-down module and the indicating module Ground connection;The output of the first voltage detection module terminates the input terminal of the voltage pull-down module, the second voltage detection The output end of module and the output end of the voltage pull-down module connect the input terminal of the switch module, the switch module respectively Output terminating load, the input of the indicating module terminates the output end of the switch module;
In the transformer short circuit, the high electricity of the first output end and second output terminal output of the division module Flat, the first voltage detection module receives high level and is connected and exports high level, and the second voltage detection module receives high Level ends, after the voltage pull-down module receives high level conducting, by the voltage pull-down of the input terminal of the switch module, institute When the input terminal for stating switch module is low level, the switch module cut-off stops to load supplying;
In the transformer secondary coil short circuit, the first output end and second output terminal of the division module export low electricity Flat, the first voltage detection module, which receives low level, to be ended and controls the voltage pull-down module cut-off, the second voltage Detection module receives low level and is connected and exports low level, when the input terminal of the switch module is low level, the switching molding Block ends, and stops to load supplying.
2. transformer short-circuit according to claim 1 protects circuit, which is characterized in that further include rectification filtering module, institute It includes rectifier diode D1 and filter capacitor C1 to state rectification filtering module, and the anode of the rectifier diode D1 connects the transformer The output end of secondary coil, the cathode of the rectifier diode D1 connect the power end of the first voltage detection module and described open The power end of module is closed, the filter capacitor C1 mono- terminates the cathode of the rectifier diode D1, other end ground connection.
3. transformer short-circuit according to claim 1 protects circuit, which is characterized in that the indicating module includes partial pressure electricity R8 and LED1 is hindered, the divider resistance R8 and the LED1 are series between the output end and ground connection of the switch module.
4. transformer short-circuit according to claim 1 protects circuit, which is characterized in that the division module includes partial pressure electricity Hinder R1, divider resistance R2 and divider resistance R3, the divider resistance R1, the divider resistance R2 and divider resistance R3 series connection Between the transformer secondary coil output end and ground connection, the divider resistance R1 is commonly connected with the divider resistance R2's Point is the first output end of the division module, and the points of common connection of the divider resistance R2 and divider resistance R3 is described The second output terminal of division module, the one end of the divider resistance R1 far from the divider resistance R2 are the electricity of the division module Source, the one end of the divider resistance R3 far from the divider resistance R2 are the ground terminal of the division module.
5. transformer short-circuit according to claim 1 protects circuit, which is characterized in that the first voltage detection module packet Triode Q1 is included, the base stage of the triode Q1, collector and emitter correspond to the input of the first voltage detection module End, power end and output end.
6. transformer short-circuit according to claim 1 protects circuit, which is characterized in that the second voltage detection module packet The base stage and emitter for including triode Q2 and divider resistance R7, the triode Q2 correspond to the second voltage detection module The collector of input terminal and output end, the triode Q2 connects the divider resistance R7, another termination of the divider resistance R7 Ground.
7. transformer short-circuit according to claim 1 protects circuit, which is characterized in that the voltage pull-down module includes point Piezoresistance R4, divider resistance R5 and triode Q4, the divider resistance R4 and the divider resistance R5 are series at the triode Between the base stage and ground connection of Q4, the points of common connection of the divider resistance R4 and divider resistance R5 is the voltage pull-down mould The input terminal of block, the emitter ground connection of the triode Q4, the extremely described voltage pull-down module of current collection of the triode Q4 Output end.
8. transformer short-circuit according to claim 1 protects circuit, which is characterized in that the switch module includes partial pressure electricity R6 and triode Q3 is hindered, the divider resistance R6 is series between the base stage and collector of the triode Q3, the triode The base stage of Q3, collector and emitter correspond to the input terminal, power end and output end of the switch module.
CN201310500655.0A 2013-10-22 2013-10-22 Transformer short-circuit protects circuit Active CN104577954B (en)

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Publication number Priority date Publication date Assignee Title
CN109802373B (en) * 2018-12-29 2024-03-22 惠州三华工业有限公司 Short-circuit protection circuit capable of improving distinction degree and short-circuit protection system
CN112531639B (en) * 2020-11-12 2022-07-29 深圳Tcl数字技术有限公司 Overcurrent protection trigger circuit and device

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CN201365203Y (en) * 2009-01-13 2009-12-16 深圳市同洲电子股份有限公司 Multiple output power circuit with short circuit protection
CN102882380A (en) * 2012-10-22 2013-01-16 广州三晶电气有限公司 Multi-path output flyback power supply with output short-circuit protection function and protection method

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CN201113384Y (en) * 2007-09-12 2008-09-10 青岛海信移动通信技术股份有限公司 Electricized overvoltage protection circuit and mobile terminal possessing the circuit
CN201263079Y (en) * 2008-09-22 2009-06-24 深圳创维-Rgb电子有限公司 Under-voltage protection circuit, power supply circuit and television set
CN201365203Y (en) * 2009-01-13 2009-12-16 深圳市同洲电子股份有限公司 Multiple output power circuit with short circuit protection
CN102882380A (en) * 2012-10-22 2013-01-16 广州三晶电气有限公司 Multi-path output flyback power supply with output short-circuit protection function and protection method

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