CN2802837Y - Switch power protection device short-circuit and overcurrent - Google Patents
Switch power protection device short-circuit and overcurrent Download PDFInfo
- Publication number
- CN2802837Y CN2802837Y CN 200420103709 CN200420103709U CN2802837Y CN 2802837 Y CN2802837 Y CN 2802837Y CN 200420103709 CN200420103709 CN 200420103709 CN 200420103709 U CN200420103709 U CN 200420103709U CN 2802837 Y CN2802837 Y CN 2802837Y
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- power supply
- switching power
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Abstract
The utility model relates to a short-circuit and overcurrent protection device of a switching power supply, which is composed of a current sampling and filtering rectification circuit, a comparative amplifying and sample hold circuit, and an action executive circuit, wherein an output end of the current sampling and filtering rectification circuit is connected with the comparative amplifying and sample hold circuit which is connected to the action executive circuit by an output end. The design principle of the utility model is characterized in that the current sampling and filtering rectification circuit detects and samples the dynamic changes of the working current of a switch adjusting pipe of the switching power supply, and determines to carry out protection or not after the actions of rectification, filtration, comparison and judgement. When VA is smaller than 1.4V, protection is cancelled. When the VA is higher than 1.4V, signal is amplified and output by the comparative amplifying and sample hold circuit, and protective action is executed by the action executive circuit, so that the switching power supply is protected. The utility model has the advantages of simple structure, wide application range, reliable work, etc.
Description
Technical field
The utility model relates to circuit protection device, especially a kind of Switching Power Supply short circuit and overcurrent protective device.
Technical background
At present, it is big that special-purpose powered switch power supply has power output usually, exportable 600W; The output ripple of 5V/6A is little, less than 50MV; Wide to mains input voltage accommodation, can be at～160V steady operation to the～250V scope; Load current is by 0 to maximum, characteristics such as output voltage is almost constant.But existing Switching Power Supply can be burnt switch adjustment pipe when load short circuits or overcurrent.Though there is load instantaneous short circuit defencive function the special-purpose integrated control chip inside of this Switching Power Supply; but the user in process of production or transfer in the machine process; make for the moment the load of 24V/12A or 38V/6A short circuit or overcurrent slightly for a long time occur because of carelessness; will burn the switch adjustment pipe of Switching Power Supply, thereby influence the normal operation of Switching Power Supply.
Summary of the invention
The purpose of this utility model is the deficiency that exists at above-mentioned Switching Power Supply, and a kind of Switching Power Supply short circuit and overcurrent protective device that is burnt when avoiding Switching Power Supply load short circuits or overcurrent is provided.
Short circuit of the utility model Switching Power Supply and overcurrent protective device; it is characterized in that: by the current sampling filter rectifier, relatively amplify sample-and-hold circuit and action executing circuit is formed; the output of current sampling filter rectifier with relatively amplify sample-and-hold circuit and be connected, relatively amplify the output termination action executing circuit of sample-and-hold circuit.
The design principle of short circuit of the utility model Switching Power Supply and overcurrent protective device is: by the current sampling filter rectifier switch of Switching Power Supply is adjusted the dynamic change that the plumber makes electric current and detect sampling; and after rectifying and wave-filtering was relatively judged, whether decision was protected.If VA＜1.4V does not then protect,, just signal is amplified output, and, Switching Power Supply is protected by the action of action executing circuit execute protection by relatively amplifying sample-and-hold circuit if during VA＞1.4V.
Short circuit of the utility model Switching Power Supply and overcurrent protective device design science, simple in structure, the scope of application is wide, reliable operation, it has following characteristics:
1, have～160V is to～250V relative broad range input voltage characteristics.
2, carrying load ability is strong, has short-circuit protection and overcurrent protection function.To～250V scope, the output current of 24V can be stablized output at 0～11A at city voltage～160V; Output current＞12A of 24V enters guard mode immediately; The output current of 38V can be stablized output at 0～5A; Output current＞6A of 38V enters protection immediately.If fault is not got rid of, Switching Power Supply just is not in guard mode, non-transformer output.After power cutoff is fixed a breakdown, re-power and to automatically reset, can enter normal operating conditions.
3, when the civil power alternating voltage＞250V of input switch power supply or＜during 160V; it is excessive promptly can to cause the switch adjustment plumber of short circuit and overcurrent protective device to make electric current; or power supply fan stall; cause the switch adjustment to manage when overheated, short circuit and overcurrent protective device can play the protective effect to Switching Power Supply equally.
4, because the current sampling of short circuit and overcurrent protective device is selected in elementary ac main circuit; to ripple that reduces direct current output and the stability that improves direct current output; up to positive role be selected in the base stage and the emitter of switching tube because of the control point of protection; this has just been avoided selecting for use the relay of high-voltage large current, can be with 5 volts of little current relays.Can utilize simultaneously existing 5 volts of power supplys of Switching Power Supply, save the trouble that to make an accessory power supply in addition, can reduce manufacturing cost simultaneously.
The concrete structure of short circuit of the utility model Switching Power Supply and overcurrent protective device is provided in detail by the following drawings and embodiment.
Description of drawings
Fig. 1 is Switching Power Supply short circuit and overcurrent protective device structural representation.
Embodiment
Embodiment: from Fig. 1 can be clear that Switching Power Supply short circuit and overcurrent protective device by current sampling filter rectifier 1, relatively amplify sample-and-hold circuit 2 and action executing circuit 3 is formed.
Described current sampling filter rectifier 1 is made of alternating current detector T3 and the full-wave rectifier tube D1 that is connected the coil two ends, and full-wave rectifier tube D1 can be made up of four diodes.The alternating current of the elementary winding of alternating current detector T3 of flowing through is big more, and the voltage that rectification is come out is just high more, and the voltage height that rectification is come out has good linear relationship with the electric current that flows through the elementary winding of alternating current detector T3.
The described sample-and-hold circuit 2 that relatively amplifies is by the 6th triode Q6, the 7th triode, Q7; play diode D2, the light-emitting diode D3 of protection self-locking action and be used for the diode D4 formation that Q6, Q7 protect; the base stage of the 7th triode Q7 is connected with the collector electrode of the 6th triode Q6 and the anode of diode D4 respectively; the base stage of the 6th triode Q6 connects the negative pole of diode D2 and refers to the negative pole of light-emitting diode D3; the current collection that the positive pole of electroluminescent lamp diode D3 meets the 7th triode Q7 connects, and the positive pole of diode D4 is connected with the collector electrode of the 7th triode Q7.
Described action executing circuit 3 is a relay K.
The full-wave rectifier tube D1 output of current sampling filter rectifier 1 connects the input that relatively amplifies sample-and-hold circuit 2 respectively, relatively amplify sample-and-hold circuit 2 by the collector electrode of its 6th triode Q6 and the relay K coil of action executing circuit 3, the head of often starting hoeing of relay K meets the first triode Q1, the second triode Q2 of Switching Power Supply.
The operation principle of Switching Power Supply short circuit and overcurrent protective device: the input of this short circuit and overcurrent protective device is connected with the coupling capacitance C of Switching Power Supply, and the output rapids is connected with the first triode Q1, the second triode Q2 of Switching Power Supply.Under the Switching Power Supply normal operating conditions, promptly during 24V output current≤11A or 38V output current≤5A, VA＜1.4V, comparison amplifier sample-and-hold circuit 2 no-outputs, the relay K of action executing circuit 3 is not worked.
When Switching Power Supply output generation overcurrent or load short circuits phenomenon, the electric current that flows through the coupling capacitance C of Switching Power Supply sharply increases, this moment VA＞1.4V, relatively amplify the saturated output of the 6th triode Q6 of sample-and-hold circuit 2, make action executing circuit 3 work, relay K gets electric adhesive, blocks the first triode Q1 of Switching Power Supply, the loop of the second triode Q2.Only cut off the electricity supply, after fault gets rid of, just can automatically reset, Switching Power Supply reenters normal operating conditions.
When line voltage is higher than～250V or be lower than～150V or when breaking down stall because of the Switching Power Supply fan, when making the first triode Q1, the second triode Q2 operating current overload of Switching Power Supply, VA＞1.4V, also can make the saturated output of the 6th triode Q6 of comparison amplifier sample-and-hold circuit 2, make action executing circuit 3 work, relay K gets electric adhesive, blocks the first triode Q1, the second triode Q2 loop of Switching Power Supply.
Claims (5)
1, a kind of Switching Power Supply short circuit and overcurrent protective device; it is characterized in that: by current sampling filter rectifier (1), relatively amplify sample-and-hold circuit (2) and action executing circuit (3) is formed; the output of current sampling filter rectifier (1) with relatively amplify sample-and-hold circuit (2) and be connected, relatively amplify the output termination action executing circuit (3) of sample-and-hold circuit (2).
2, Switching Power Supply short circuit according to claim 1 and overcurrent protective device is characterized in that: current sampling filter rectifier (1) is made of alternating current detector T3 and the full-wave rectifier tube D1 that is connected its coil two ends.
3; Switching Power Supply short circuit according to claim 1 and 2 and overcurrent protective device; it is characterized in that: relatively amplify sample-and-hold circuit (2) by the 6th triode Q6; the 7th triode; Q7; play the diode D2 of protection self-locking action; light-emitting diode D3 and be used for Q6; the diode D4 of Q7 protection constitutes; the base stage of the 7th triode Q7 is connected with the collector electrode of the 6th triode Q6 and the anode of diode D4 respectively; the base stage of the 6th triode Q6 connects the negative pole of diode D2 and the negative pole of light-emitting diode D3; the current collection that the positive pole of light-emitting diode D3 meets the 7th triode Q7 connects, and the positive pole of diode D4 is connected with the collector electrode of the 7th triode Q7.
4, Switching Power Supply short circuit according to claim 1 and 2 and overcurrent protective device is characterized in that: action executing circuit (3) is a relay K.
5, Switching Power Supply short circuit according to claim 3 and overcurrent protective device is characterized in that: action executing circuit (3) is a relay K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420103709 CN2802837Y (en) | 2004-12-31 | 2004-12-31 | Switch power protection device short-circuit and overcurrent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420103709 CN2802837Y (en) | 2004-12-31 | 2004-12-31 | Switch power protection device short-circuit and overcurrent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2802837Y true CN2802837Y (en) | 2006-08-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420103709 Expired - Fee Related CN2802837Y (en) | 2004-12-31 | 2004-12-31 | Switch power protection device short-circuit and overcurrent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2802837Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594129A (en) * | 2011-01-08 | 2012-07-18 | 深圳市澳地特电气技术有限公司 | Charging control method for direct-current bus capacitor of frequency converter and realizing circuit charging control method |
| CN102611079A (en) * | 2012-03-13 | 2012-07-25 | 华为技术有限公司 | Short-circuit protection system and short-circuit protection method for isolated power converter |
| CN104934934A (en) * | 2015-06-24 | 2015-09-23 | 佛山联升压铸科技有限公司 | Short circuit detecting protective device for die-casting machine |
-
2004
- 2004-12-31 CN CN 200420103709 patent/CN2802837Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594129A (en) * | 2011-01-08 | 2012-07-18 | 深圳市澳地特电气技术有限公司 | Charging control method for direct-current bus capacitor of frequency converter and realizing circuit charging control method |
| CN102611079A (en) * | 2012-03-13 | 2012-07-25 | 华为技术有限公司 | Short-circuit protection system and short-circuit protection method for isolated power converter |
| CN104934934A (en) * | 2015-06-24 | 2015-09-23 | 佛山联升压铸科技有限公司 | Short circuit detecting protective device for die-casting machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060802 Termination date: 20121231 |