CN203415955U - Novel short-circuit protection circuit for switching power supply - Google Patents
Novel short-circuit protection circuit for switching power supply Download PDFInfo
- Publication number
- CN203415955U CN203415955U CN201320524007.4U CN201320524007U CN203415955U CN 203415955 U CN203415955 U CN 203415955U CN 201320524007 U CN201320524007 U CN 201320524007U CN 203415955 U CN203415955 U CN 203415955U
- Authority
- CN
- China
- Prior art keywords
- circuit
- power supply
- resistance
- switching power
- triode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a novel short-circuit protection circuit for a switching power supply, and the protection circuit comprises a fault sampling circuit, a pulse generator circuit, and an isolation drive circuit. The fault sampling circuit is used for collecting a fault signal of the switching power supply, and switching on/off the pulse generator circuit according to the fault signal. The pulse generator circuit is used for driving the switching power supply to work discontinuously according to the fault signal collected by a feedback loop, thereby enabling the circuit power to be smaller, and supplying long-time protection for circuits. The isolation drive circuit is used for isolation and guide, and preventing other circuits from affecting the frequency of the pulse generator circuit. The short-circuit protection circuit provided by the utility model is simple in structure, and is easy to debug. Through the arrangement of sampling points with low power dissipation and employing a pulse generator to drive switching power supply to work discontinuously, the short-circuit protection circuit greatly reduces the power dissipation, plays a role of long-time protection, and enables the switching power supply to recover automatically and work normally in any kind of environment after an fault is eliminated.
Description
Technical field
The utility model relates to field of switch power, is specifically related to a kind of novel switched power supply short-circuit protective circuit.
Background technology
In the military-civil electronic systems such as Switching Power Supply is widely used in space flight, aviation, boats and ships, weapons, electronics, railway with the DC/DC converter as secondary system power supply, communicates by letter, medical electronics, industrial automation equipment.When overload or short circuit occur external circuit, short-circuit protection circuit can reduce the input power of Switching Power Supply or DC/DC converter, and protective effect is provided.Under the effect of short-circuit protection circuit, can avoid external circuit further to damage, to avoid Switching Power Supply or DC/DC converter to cross roughly temperature because of power consumption and raise and damage, protection primary power source avoids it to affect other system because of self short trouble.Isolation type switch power or DC/DC converter generally all have overload or short-circuit protection function, by input power characteristic, can be divided into current-limiting type protective circuit and subtract the large class of flow pattern protective circuit two.
Current-limiting type protective circuit is sampled to Switching Power Supply or DC/DC converter electric current secondary or prime power loop conventionally, and to be input power increase with the increase of load the feature of circuit.When being short-circuited fault, input power is limited in a certain fixed value that is greater than rated input power.Because it is very fast that Switching Power Supply or DC/DC converter autophage power are large, temperature rises, current-limiting type protective circuit can only provide short duration protection.Because fault subsystem consumed power is large, causes primary power source consumed power also large, thereby affect lifetime of system in addition, this is critical defect in the equipment of the use chemical cell energy such as satellite, guided missile and the solar cell energy.
Subtracting flow pattern protective circuit is also that Switching Power Supply or DC/DC converter electric current secondary or prime power loop are sampled, and to be input power increase with the increase of load the feature of circuit.When being short-circuited fault, input power declines, lower than rated input power.Current-limiting type protective circuit can provide a protection for a long time to isolation type switch power or DC/DC converter, load and primary power source.Existingly subtract the deficiency that flow pattern protective circuit mainly contains following three aspects:: the one, short-circuit signal is to sample from main loop of power circuit, power consumption is large; The 2nd, circuit structure is complicated, components and parts are many, debug difficulties; The 3rd, circuit is responsive to ambient temperature, makes Switching Power Supply or DC/DC converter short-circuit dissipation difference under high low temperature large, even can cause, after high low temperature short trouble is eliminated, can not braking recovery.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of novel switched power supply short-circuit protective circuit, fault sampled point is arranged on to the feedback loop of Switching Power Supply, greatly reduces power consumption.This short-circuit protection circuit not only simple in structure, be easy to debugging, also there is higher temperature stability, it is very little that short-circuit dissipation is affected by parameter drift.
The technical solution of the utility model is: a kind of novel switched power supply short-circuit protective circuit, comprises successively connected fault sample circuit, pulse-generator circuit and isolated drive circuit; Described fault sample circuit one end is connected with Switching Power Supply feedback loop, and the other end is connected with pulse-generator circuit; Described isolated drive circuit is connected with Switching Power Supply port.
Described fault sample circuit comprises triode T1 and resistance R 4; The base stage of described triode T1 is connected to feedback loop, and the collector electrode of described triode T1 is connected with impulse sender circuit, the grounded emitter of described triode T1; Described resistance R 4 one end are connected to the base stage of triode T1, one end ground connection; During described triode T1 conducting, described pulse-generator circuit work; When described triode T1 ends, described pulse-generator circuit quits work.
Described pulse-generator circuit comprises Schmidt trigger Q1, resistance R 1, resistance R 2, diode D1 and capacitor C 1; Described input of Schmidt trigger Q1 connects power supply VCC by resistance R 3, and another input is by capacitor C 1 ground connection; Described resistance R 1 one end is connected to the negative electrode of diode D1, and the other end is through capacitor C 1 ground connection; Described resistance R 2 one end are connected to the output of Schmidt trigger, and the other end is through capacitor C 1 ground connection; The anodic bonding of described diode D1 is to the output of Schmidt trigger Q1.
Described isolated drive circuit comprises not gate Q2, NAND gate Q3 and diode D2; Described not gate Q2 input is connected with Schmidt trigger output, and an input of output and NAND gate Q3 is connected; Another input of described NAND gate Q3 is connected to power supply VCC through resistance R 3, and output is connected to the negative electrode of diode D2; The anodic bonding of described diode D2 is to Switching Power Supply port.
Described isolated drive circuit comprises not gate Q2, resistance R 6 and triode T2; Described not gate Q2 input is connected with Schmidt trigger output, and output is connected with the base stage of triode T2 through resistance R 6; The collector electrode of described triode T2 is connected to Switching Power Supply port, the grounded emitter of described triode T2.
Advantage of the present utility model:
(1) short circuit protecting circuit for switch power of the present utility model adopts fault sample circuit, pulse-generator circuit and isolated drive circuit in conjunction with protecting.The effect of fault sample circuit is the fault-signal that gathers Switching Power Supply, and opens or close pulse-generator circuit according to fault-signal.Different in main loop of power circuit sampling from existing short circuit current, the sampled point of fault sample circuit is arranged on the feedback loop of Switching Power Supply, hardly consumed power.Fault sample circuit is simple in structure, only includes a transistor and resistance, convenient debugging.
(2) effect of pulse-generator circuit is the fault-signal according to the feedback loop that collects, driving switch power supply discontinuous operation, thus make circuit there is less average power, long-term short-circuit protection effect can be provided.After short trouble is eliminated, pulse-generator circuit actuable switch power supply recovers normal operating conditions automatically.The pulse-generator circuit driving switch power supply intermittently used time interval can be set, and by suitable value is set, not only can greatly reduce power consumption, meet green energy resource standard, also can improve the reliability of Switching Power Supply.
(3) effect of isolated drive circuit is isolation and guiding, avoids the frequency of other circuit paired pulses generator circuit to exert an influence.
The utility model is simple in structure, easily debugging; and by sampled point low in energy consumption being set and utilizing pulse generator driving switch power supply discontinuous operation; greatly reduce circuit power consumption; play long-term short-circuit protection effect, and can make Switching Power Supply all can after Failure elimination, automatically recover normal condition in various environment.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model embodiment 1;
Fig. 2 is the circuit theory diagrams of the utility model embodiment 2;
Fig. 3 is pulse-generator circuit output oscillogram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further:
A kind of novel switched power supply short-circuit protective circuit as shown in Figure 1, comprises successively connected fault sample circuit 1, pulse-generator circuit 2 and isolated drive circuit 3; Fault sample circuit 1 one end is connected with Switching Power Supply feedback loop, and the other end is connected with pulse-generator circuit 2; Isolated drive circuit 3 is connected with Switching Power Supply port E.
Further, fault sample circuit 1 comprises triode T1 and resistance R 4; The base stage of triode T1 is connected to feedback loop, and the collector electrode of triode T1 is connected with pulse-generator circuit 2, the grounded emitter of triode T1; Resistance R 4 one end are connected to the base stage of triode T1, one end ground connection; During triode T1 conducting, pulse-generator circuit work; During triode T1 cut-off, pulse-generator circuit quits work.
Further, pulse-generator circuit 2 comprises Schmidt trigger Q1, resistance R 1, resistance R 2, diode D1 and capacitor C 1; Input of Schmidt trigger Q1 connects power supply VCC by resistance R 3, and another input is by capacitor C 1 ground connection; Resistance R 1 one end is connected to the negative electrode of diode D1, and the other end is through capacitor C 1 ground connection; Resistance R 2 one end are connected to the output of Schmidt trigger, and the other end is through capacitor C 1 ground connection; The anodic bonding of diode D1 is to the output of Schmidt trigger Q1.
Further, isolated drive circuit 3 comprises not gate Q2, NAND gate Q3 and diode D2; Described not gate Q2 input is connected with Schmidt trigger output, and an input of output and NAND gate Q3 is connected; Another input of NAND gate Q3 is connected to power supply VCC through resistance R 3, and output is connected to the negative electrode of diode D2; The anodic bonding of diode D2 is to Switching Power Supply port.Specifically, the secondary gate circuit high level in isolated drive circuit 3 is to realize by the resistance R 3 in pulse-generator circuit 2.
A kind of novel switched power supply short-circuit protective circuit as shown in Figure 2, only isolated drive circuit 3 is different from embodiment 1, and other circuit structures and operation principle are with embodiment 1.
Isolated drive circuit 3 comprises not gate Q2, resistance R 6 and triode T2; Not gate Q2 input is connected with Schmidt trigger output, and output is connected with the base stage of triode T2 through resistance R 6; The collector electrode of triode T2 is connected to Switching Power Supply port, the grounded emitter of triode T2.
Operation principle of the present utility model:
First, fault sample circuit 1 gathers fault-signal from the feedback loop of Switching Power Supply, from Switching Power Supply PWM error amplifier input stage, obtains.When load overload or short trouble, due to switch power supply secondary lower voltage, the electric current in photoelectrical coupler T2 reduces, the lower voltage in resistance R 4, thus make triode T1 cut-off.Now in pulse generator 2 circuit, resistance R 3 is high level with Schmidt trigger Q1 link voltage, 2 work of drive-pulse generator circuit.The effect of isolated drive circuit 3 is isolation and guiding, avoids the frequency of other circuit paired pulses generator circuit to exert an influence.The circuit structure of isolated drive circuit 3 can adopt as secondary reverse swing door circuit Q2, Q3 and isolating diode D2 in embodiment 1, or adopts as the triode T2 in embodiment 2 and current-limiting resistance R6, is all the effect of playing isolation and guiding.When load or circuit are when normal, because switch power supply secondary voltage raises, the electric current in photoelectrical coupler T2 increases, and the voltage in resistance R 4 raises, thereby makes triode T1 conducting.Now in pulse-generator circuit 2, resistance R 3 is low level with Schmidt trigger Q1 link voltage, and pulse-generator circuit quits work, thereby driving switch power supply recovers normal operating conditions automatically.The soft start port of isolated drive circuit 3 and PWM Switching Power Supply, forbid that the close port of port or accessory power supply is connected, thereby realize the control to PWM switching power circuit.
Secondly, as shown in Figure 3, by pulse-generator circuit 2, realized the intermittent work of Switching Power Supply,, in one-period, during shorter time T ON, worked, in longer time T OFF, quit work.The square-wave signal that the Schmidt trigger Q1 output output cycle in pulse-generator circuit is TON+TOFF, this signal controllable switch power supply intermittent work.The 2 driving switch power supply intermittently used time intervals of pulse-generator circuit can be set, and by suitable value is set, not only can greatly reduce power consumption, meet green energy resource standard, also can improve the reliability of Switching Power Supply.Conventionally in the transmission time that TON value is feedback loop, TOFF value is required failure recovery time.Switching Power Supply discontinuous operation, can reduce the Mean Input Power of circuit, realizes the short-circuit protection function of low input power.When short trouble is eliminated, TON pulsed drive Switching Power Supply is recovered normal operating conditions automatically.Meanwhile, short-circuit protection circuit detects the normal operation signal of Switching Power Supply, and this circuit quits work.
Above-described embodiment is described preferred implementation of the present utility model; not scope of the present utility model is limited; do not departing under the prerequisite of the utility model design spirit; various distortion and improvement that those of ordinary skills make the technical solution of the utility model, all should fall in the definite protection range of the utility model claims.
Claims (5)
1. a novel switched power supply short-circuit protective circuit, is characterized in that: comprise successively connected fault sample circuit, pulse-generator circuit and isolated drive circuit; Described fault sample circuit one end is connected with Switching Power Supply feedback loop, and the other end is connected with pulse-generator circuit; Described isolated drive circuit is connected with Switching Power Supply port.
2. a kind of novel switched power supply short-circuit protective circuit according to claim 1, is characterized in that: described fault sample circuit comprises triode T1 and resistance R 4; The base stage of described triode T1 is connected to feedback loop, and the collector electrode of described triode T1 is connected with impulse sender circuit, the grounded emitter of described triode T1; Described resistance R 4 one end are connected to the base stage of triode T1, one end ground connection.
3. a kind of novel switched power supply short-circuit protective circuit according to claim 1, is characterized in that: described pulse-generator circuit comprises Schmidt trigger Q1, resistance R 1, resistance R 2, diode D1 and capacitor C 1; Described input of Schmidt trigger Q1 connects power supply VCC by resistance R 3, and another input is by capacitor C 1 ground connection; Described resistance R 1 one end is connected to the negative electrode of diode D1, and the other end is through capacitor C 1 ground connection; Described resistance R 2 one end are connected to the output of Schmidt trigger, and the other end is through capacitor C 1 ground connection; The anodic bonding of described diode D1 is to the output of Schmidt trigger Q1.
4. a kind of novel switched power supply short-circuit protective circuit according to claim 1, is characterized in that: described isolated drive circuit comprises not gate Q2, NAND gate Q3 and diode D2; Described not gate Q2 input is connected with Schmidt trigger output, and an input of output and NAND gate Q3 is connected; Another input of described NAND gate Q3 is connected to power supply VCC through resistance R 3, and output is connected to the negative electrode of diode D2; The anodic bonding of described diode D2 is to Switching Power Supply port.
5. a kind of novel switched power supply short-circuit protective circuit according to claim 1, is characterized in that: described isolated drive circuit comprises not gate Q2, resistance R 6 and triode T2; Described not gate Q2 input is connected with Schmidt trigger output, and output is connected with the base stage of triode T2 through resistance R 6; The collector electrode of described triode T2 is connected to Switching Power Supply port, the grounded emitter of described triode T2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320524007.4U CN203415955U (en) | 2013-08-27 | 2013-08-27 | Novel short-circuit protection circuit for switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320524007.4U CN203415955U (en) | 2013-08-27 | 2013-08-27 | Novel short-circuit protection circuit for switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203415955U true CN203415955U (en) | 2014-01-29 |
Family
ID=49978814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320524007.4U Expired - Fee Related CN203415955U (en) | 2013-08-27 | 2013-08-27 | Novel short-circuit protection circuit for switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203415955U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401220A (en) * | 2013-08-27 | 2013-11-20 | 中国电子科技集团公司第四十三研究所 | Novel switch power supply short-circuit protection circuit and protection method |
| CN109245052A (en) * | 2018-08-29 | 2019-01-18 | 广州金升阳科技有限公司 | A kind of short-circuit protection circuit and the Switching Power Supply comprising the circuit |
| CN110166325A (en) * | 2019-06-12 | 2019-08-23 | 首钢京唐钢铁联合有限责任公司 | A kind of determination method and device of communication network failure |
-
2013
- 2013-08-27 CN CN201320524007.4U patent/CN203415955U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401220A (en) * | 2013-08-27 | 2013-11-20 | 中国电子科技集团公司第四十三研究所 | Novel switch power supply short-circuit protection circuit and protection method |
| CN103401220B (en) * | 2013-08-27 | 2016-08-17 | 中国电子科技集团公司第四十三研究所 | A kind of novel switched power supply short-circuit protective circuit and guard method thereof |
| CN109245052A (en) * | 2018-08-29 | 2019-01-18 | 广州金升阳科技有限公司 | A kind of short-circuit protection circuit and the Switching Power Supply comprising the circuit |
| CN109245052B (en) * | 2018-08-29 | 2024-04-12 | 广州金升阳科技有限公司 | Short-circuit protection circuit and switching power supply comprising same |
| CN110166325A (en) * | 2019-06-12 | 2019-08-23 | 首钢京唐钢铁联合有限责任公司 | A kind of determination method and device of communication network failure |
| CN110166325B (en) * | 2019-06-12 | 2022-10-04 | 首钢京唐钢铁联合有限责任公司 | Method and device for determining communication network fault |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102315632B (en) | Driving circuit for inhibiting over current of IGBT (Insulated Gate Bipolar Transistor) | |
| CN103199832B (en) | IGBT Drive Protecting Circuit and system | |
| CN103606895B (en) | A kind of overvoltage turn-off protection circuit | |
| CN202405759U (en) | Over-current protection circuit for direct-current switching power source | |
| CN102709883B (en) | Under-voltage protection circuit of switch power source | |
| CN103346538A (en) | Short-circuit protection circuit for APF high-power IGBT | |
| CN203415955U (en) | Novel short-circuit protection circuit for switching power supply | |
| CN102931960A (en) | IGBT (insulated gate bipolar translator) protection method and protection circuit | |
| CN204304965U (en) | A kind of IGBT push-pull driver circuit | |
| CN103401220B (en) | A kind of novel switched power supply short-circuit protective circuit and guard method thereof | |
| CN202333786U (en) | Drive circuit for restraining IGBT (Insulated Gate Bipolar Transistor) overcurrent | |
| CN203445592U (en) | High-side output circuit with short-circuit protection | |
| CN202978213U (en) | Power supply overvoltage protection circuit | |
| CN201682411U (en) | Switch control circuit with short circuit protection | |
| CN204205568U (en) | Switching Power Supply and short-circuit protection circuit thereof | |
| CN203596738U (en) | Switch power supply output overvoltage protection circuit | |
| CN101877475B (en) | Power supply short-circuit protection circuit | |
| CN202424663U (en) | IGBT (insulated gate bipolar transistor) driving protection circuit and IGBT driving protection system | |
| CN109980600B (en) | Negative bias protection circuit powered by TR (transmitter-receiver) component | |
| CN202906437U (en) | Input undervoltage protection circuit | |
| CN202978235U (en) | >Switch power supply high-precision overvoltage protection circuit | |
| CN203607824U (en) | Overvoltage turn-off protective circuit | |
| CN203415942U (en) | Fault signal processing circuit | |
| CN205141638U (en) | Switching power supply output short circuit disconnection protection circuit | |
| CN110854961B (en) | Power-on impact current suppression circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140129 Termination date: 20170827 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |