CN201252396Y - Overvoltage protective circuit for inputted high voltage of switch power supply - Google Patents
Overvoltage protective circuit for inputted high voltage of switch power supply Download PDFInfo
- Publication number
- CN201252396Y CN201252396Y CNU200820133094XU CN200820133094U CN201252396Y CN 201252396 Y CN201252396 Y CN 201252396Y CN U200820133094X U CNU200820133094X U CN U200820133094XU CN 200820133094 U CN200820133094 U CN 200820133094U CN 201252396 Y CN201252396 Y CN 201252396Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- power supply
- protective circuit
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to an overvoltage protective circuit for the inputted high voltage in a switch power supply, comprising a resistor, a capacitor, a triode and a thyristor. The overvoltage protective circuit protects the circuit through enabling the thyristor to be in a disconnection state and a connection state. The overvoltage protective circuit has simple structure, small volume and rapid reaction speed of a switch, and greatly improves the safety performance of the switch power supply.
Description
Technical field
The utility model relates to a kind of Switching Power Supply input high pressure overvoltage crowbar.
Background technology
Because the civil power instability, when input voltage was too high, can there be potential safety hazards such as inefficacy or overvoltage blast in the switching voltage components and parts, cause certain loss.And existing on the market power supply overvoltage protection circuit is just simply realized over-voltage protecting function by relay, and shortcoming is that unit price is expensive, and volume is big, and on-off effect is slow, does not reach the protection effect.
The utility model content
The purpose of this utility model is to improve above-mentioned the deficiencies in the prior art and a kind of Switching Power Supply input high pressure overvoltage crowbar is provided.
Technical solutions of the utility model are:
Switching Power Supply input high pressure overvoltage crowbar, circuit is constructed as follows:
Resistance R 5, R6, R7 is connected between the circuit input end successively, the base stage of triode Q1 is a little received in being connected in series of resistance R 6 and resistance R 7, the other end of resistance R 7 is connected to the emitter of triode Q1, series resistor R8, resistance R 4 successively between the input that collector electrode and the resistance R 5 of triode Q1 has common junction, capacitor C 3 and controllable silicon SCR 1 are connected in parallel on collector electrode and the emitter two ends of triode Q1 respectively.
Resistance R 4, R5, R6, R7, the claimed input voltage value of R8 control overvoltage is formed closed loop with triode Q1 and capacitor C 3, makes SCR1 enter the switch state of a control automatically, reaches the purpose of protection.Regulate resistance R 4, R5, R6, R7, each resistance of R8 can obtain claimed input voltage value.
The utility model circuit is simple, and volume is little, and overall price is cheap, and on-off effect speed is fast.Overvoltage protection value scalable, and adjustable precision height.Take into account profile and function simultaneously, greatly improved the security performance of Switching Power Supply.
Description of drawings
Fig. 1 overvoltage crowbar structure chart;
Fig. 2 application implementation circuit structure diagram.
Embodiment
Below in conjunction with Fig. 1, Fig. 2 the utility model is further specified.
At 12VDC, in the 1A switching power circuit, behind input ac voltage, the signal of input is through insurance resistance and piezo-resistance safeguard protection circuit 1, and input rectifying filter circuit 2 is to importing overvoltage protection circuit 3.
Voltage in entering overvoltage protection circuit 3 is positioned at the input overvoltage voltage of having set that will protect when following, and the SCR1 controllable silicon is in the switch conduction state, and promptly the entire product circuit is in normal operating conditions; When input voltage reached the input overvoltage voltage that needs protection of setting, the SCR1 controllable silicon was in the switch closed condition, and promptly entire circuit is in the state of quitting work, thereby protection switch voltage components and parts do not have potential safety hazards such as inefficacy or overvoltage blast.
In above-mentioned overvoltage protection circuit 3; when input voltage surpasses 360VAC protection point; get R4=R5=R6=1.5M Ω; R7=2K Ω; R8=270K Ω; can realize that the SCR1 controllable silicon turn-offs when input voltage reaches 360VAC, thereby the entire product circuit is in the state of quitting work, and reaches over-voltage protecting function.
Through behind the protection circuit against input over-voltage 3; signal starts working drive circuit 5 through start-up circuit 4; drive circuit 5 driving switch circuit 6 and pwm control circuit 7 work; the pulse that pwm control circuit 7 control switch circuit 6 are given a stabilized frequency is finished the input voltage pwm voltage and is transformed into the output required voltage to transformer voltage change-over circuit 8.
By transformer voltage change-over circuit 8 switch transition is frequently arranged; the transformer output voltage passes through current rectifying and wave filtering circuit 9 again; output voltage passes through the fine adjustment of reference circuit 10 and sample circuit 11 again, and the output voltage that output safety is stable is regulated in the safeguard protection of constant-current circuit 12.
At said process after to finish first be stable output voltage by switch state from input voltage, the reference circuit 10 of product can make feedback control circuit 13 start working, make drive circuit 5 and pwm control circuit 7 work by light idol power supply circuits 14 again simultaneously, can reach the energy resource consumption of operating state minimum like this, particularly unloaded stand-by power consumption is below 0.3W.
Claims (1)
1, a kind of Switching Power Supply input high pressure overvoltage crowbar; it is characterized in that: circuit is constructed as follows: resistance R 5; R6; R7 is connected between the circuit input end successively; the base stage of triode Q1 is a little received in being connected in series of resistance R 6 and resistance R 7; the other end of resistance R 7 is connected to the emitter of triode Q1; series resistor R8, resistance R 4 successively between the input that collector electrode and the resistance R 5 of triode Q1 has common junction, capacitor C 3 and controllable silicon SCR 1 are connected in parallel on collector electrode and the emitter two ends of triode Q1 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820133094XU CN201252396Y (en) | 2008-07-30 | 2008-07-30 | Overvoltage protective circuit for inputted high voltage of switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820133094XU CN201252396Y (en) | 2008-07-30 | 2008-07-30 | Overvoltage protective circuit for inputted high voltage of switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201252396Y true CN201252396Y (en) | 2009-06-03 |
Family
ID=40748059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820133094XU Expired - Fee Related CN201252396Y (en) | 2008-07-30 | 2008-07-30 | Overvoltage protective circuit for inputted high voltage of switch power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201252396Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807792B (en) * | 2010-05-12 | 2012-08-29 | 英飞特电子（杭州）有限公司 | Power protection device |
| CN108322027A (en) * | 2017-01-18 | 2018-07-24 | 奥克斯空调股份有限公司 | A kind of power conversion circuit |
| CN108322028A (en) * | 2017-01-18 | 2018-07-24 | 奥克斯空调股份有限公司 | A kind of power conversion circuit and its control method |
-
2008
- 2008-07-30 CN CNU200820133094XU patent/CN201252396Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807792B (en) * | 2010-05-12 | 2012-08-29 | 英飞特电子（杭州）有限公司 | Power protection device |
| CN108322027A (en) * | 2017-01-18 | 2018-07-24 | 奥克斯空调股份有限公司 | A kind of power conversion circuit |
| CN108322028A (en) * | 2017-01-18 | 2018-07-24 | 奥克斯空调股份有限公司 | A kind of power conversion circuit and its control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204967252U (en) | Power input protection circuit | |
| CN203301611U (en) | Direct-current switching circuit and switching power source | |
| CN201252396Y (en) | Overvoltage protective circuit for inputted high voltage of switch power supply | |
| CN201039000Y (en) | A standby protection circuit | |
| CN203537236U (en) | A digital high frequency high voltage electrostatic dust remover power supply | |
| CN202495761U (en) | Capacitor constant power discharge circuit | |
| CN2838024Y (en) | Switch circuit in device power supply circuit | |
| CN102707107A (en) | Portable adjustable direct current voltage source for test of frequency changer | |
| CN210016406U (en) | Control system and power supply system | |
| CN202524284U (en) | Switch power supply capable of outputting high peak power | |
| CN201066484Y (en) | Energy-saving peripheral | |
| CN205566256U (en) | Alternating load isolation control circuit | |
| CN204967618U (en) | Switching power supply for a frequency converter | |
| CN203026932U (en) | Spark limiting circuit of intrinsically safe power supply | |
| CN104991484B (en) | Standby zero-power-consumption countdown timer | |
| CN202120050U (en) | Power saving device of communication base station | |
| CN205184013U (en) | A control circuit for gas shielded arc welding connects device | |
| CN202495758U (en) | Uninterrupted surge voltage stabilizer | |
| CN203289359U (en) | Explosion-proof high voltage soft starter controller | |
| CN204719550U (en) | A kind of water level in water pool control circuit | |
| CN201191764Y (en) | Electric electricity-saving controller | |
| CN204216801U (en) | A kind of built in bypass type soft starter | |
| CN203532297U (en) | Automobile fan speed control circuit | |
| CN203352449U (en) | Multifunctional direct-current high-voltage power supply with intelligent numerical-control voltage stabilization | |
| CN202748690U (en) | Power limiting circuit based on LM2576 series |
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: 20090603 Termination date: 20160730 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |