CN203368004U - Power supply protection circuit and switch power supply - Google Patents
Power supply protection circuit and switch power supply Download PDFInfo
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- CN203368004U CN203368004U CN 201320360444 CN201320360444U CN203368004U CN 203368004 U CN203368004 U CN 203368004U CN 201320360444 CN201320360444 CN 201320360444 CN 201320360444 U CN201320360444 U CN 201320360444U CN 203368004 U CN203368004 U CN 203368004U
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Abstract
本实用新型公开了一种电源保护电路和开关电源，其中，电源保护电路与电源连接，电源保护电路设有连接电源正极的电源输入端和外接负载的供电输出端，电源保护电路还包括正温热敏电阻和第一稳压二极管，正温热敏电阻的一端连接电源输入端，正温热敏电阻的另一端连接供电输出端；第一稳压二极管的阴极连接供电输出端，第一稳压二极管的阳极连接电源负极。本实用新型的电源保护电路和开关电源，通过正温热敏电阻在过流或短路电流时，自动切断输出回路，保护了电源和负载，在电流恢复正常时，自动恢复正常导通工作；又通过第一稳压二极管在电源过压输出时导通，将负载电压钳位在该导通值，防止负载电压继续上升，保护了负载。
The utility model discloses a power supply protection circuit and a switching power supply, wherein the power supply protection circuit is connected with a power supply, the power supply protection circuit is provided with a power supply input terminal connected to the positive pole of the power supply and a power supply output terminal connected with an external load, and the power supply protection circuit also includes a positive temperature The thermistor and the first voltage stabilizing diode, one end of the positive temperature thermistor is connected to the power supply input end, the other end of the positive temperature thermistor is connected to the power supply output end; the cathode of the first voltage stabilizing diode is connected to the power supply output end, the first stabilizing The anode of the voltage diode is connected to the negative pole of the power supply. The power supply protection circuit and the switching power supply of the utility model automatically cut off the output circuit through the positive temperature thermistor in case of overcurrent or short-circuit current, protecting the power supply and load, and automatically resume normal conduction work when the current returns to normal; Through the conduction of the first voltage stabilizing diode when the power supply is overvoltage output, the load voltage is clamped at the conduction value, preventing the load voltage from continuing to rise, and protecting the load.
Description
Technical field
The utility model relates to electronic technology field, particularly a kind of power protecting circuit and Switching Power Supply.
Background technology
The fields such as the Switching Power Supply product is widely used in that industrial automatic control, military industry equipment, research equipment, LED illumination, industrial control equipment, communication apparatus, power equipment, instrument and meter, Medical Devices, semiconductor refrigerating heat, air purifier, electronic refrigerator, liquid crystal display, LED light fixture, communication apparatus, audio-visual products, security protection, computer housing, digital product and instrument class.
The Switching Power Supply be applied in mobile unit of take is example, and the Switching Power Supply in mobile unit can be to external power consumption equipment power supply, and wherein with the most use is the charging of the portable sets such as mobile phone, panel computer and in-car TV.When the short circuit of on-vehicle battery power supply output overcurrent, can have a strong impact on the safety of vehicle; Simultaneously, the output voltage of on-vehicle battery contains very large due to voltage spikes, likely Switching Power Supply is broken, also may be excessive because of the voltage be added on the power consumption equipments such as external mobile phone, panel computer, and damage power consumption equipment.
The utility model content
Main purpose of the present utility model can, when crossing flow short-circuit and due to voltage spikes generation, guarantee power protecting circuit and the Switching Power Supply of Switching Power Supply and power consumption equipment safety for providing a kind of.
The utility model proposes a kind of power protecting circuit, with power supply, be connected, described power protecting circuit is provided with the power input of connection positive source and the power supply output of external load, described power protecting circuit also comprises just warm quick resistance and the first voltage stabilizing didoe, one end of described just warm quick resistance connects described power input, and the other end of described just warm quick resistance connects described power supply output; The negative electrode of described the first voltage stabilizing didoe connects described power supply output, the anodic bonding power cathode of described the first voltage stabilizing didoe.
Preferably, described just warm quick resistance and the laminating of the first voltage stabilizing didoe arrange.
Preferably, also comprise the alarm indication circuit, described alarm indication circuit is in parallel with described just warm quick resistance.
Preferably, described alarm indication circuit comprises the first light-emitting diode and the first resistance, the positive pole of described the first light-emitting diode connects described power input, the negative pole of described the first light-emitting diode connects an end of described the first resistance, and the other end of described the first resistance connects the negative electrode of described the first voltage stabilizing didoe.
Preferably, also comprise the work display circuit, an end of described work display circuit connects described power input, and the other end of described work display circuit connects described power cathode.
Preferably, described work display circuit comprises the second light-emitting diode, the second resistance, the 3rd resistance and the second voltage stabilizing didoe, the positive pole of described the second light-emitting diode connects described power input, the negative pole of described the second light-emitting diode connects an end of described the second resistance, the other end of described the second resistance connects the negative electrode of described the second voltage stabilizing didoe, the described power cathode of the anodic bonding of described the second voltage stabilizing didoe, described the 3rd resistance is in parallel with voltage stabilizing didoe.
Preferably, described the first light-emitting diode is red light emitting diodes, and described the second light-emitting diode is green LED.
Preferably, described the first light-emitting diode and the laminating of the second light-emitting diode arrange.
The utility model also proposes a kind of Switching Power Supply, comprises power protecting circuit as above.
Power protecting circuit of the present utility model and Switching Power Supply, when overcurrent or the short circuit current, cut off output loop by just warm quick resistance automatically, protected power supply and load, when electric current recovers normal, automatically recovers normally work; By the conducting when the power supply overvoltage is exported of the first voltage stabilizing didoe, the load voltage clamper, in this conduction value, is prevented to load voltage continues to rise again, protected load; Circuit is simple and working stability is reliable.
The accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model power protecting circuit one embodiment;
Fig. 2 is the circuit diagram of another embodiment of the utility model power protecting circuit.
The realization of the utility model purpose, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, the circuit diagram that Fig. 1 is the utility model power protecting circuit 20 1 embodiment, the power protecting circuit 20 that this embodiment proposes, with power supply 10, be connected, power protecting circuit 20 is provided with the power input A of connection power supply 10 positive poles and the power supply output B of external load RL, power protecting circuit 20 also comprises just warm quick resistance PPTC and the first voltage stabilizing didoe DZ1, the end of just warm quick resistance PPTC connects power supply 10 input A, and the other end of just warm quick resistance PPTC connects power supply output B; The negative electrode of the first voltage stabilizing didoe DZ1 connects power supply output B, anodic bonding power supply 10 negative poles of the first voltage stabilizing didoe DZ1.
The specific works principle of the present embodiment power protecting circuit 20 is:
1, when power supply 10 and load RL normally work, just warm quick resistance PPTC is in conducting state, normal operation, the first not conducting of voltage stabilizing didoe DZ1;
2, when power supply 10 normal operations, when load RL overcurrent or short circuit, the electric current that flows through just warm quick resistance PPTC increases, just warm quick resistance PPTC heating, finally reach Curie point, just warm quick resistance PPTC presents off state, has cut off load RL electric current, protect power supply 10, also protected load RL; When electric current recovers normal, the temperature of just warm quick resistance PPTC reduces gradually, and its resistance slowly reduces, and can recover the normally state again;
3,, when overvoltage appears in power supply 10, load RL voltage raises, while reaching the conduction value of the first voltage stabilizing didoe DZ1; the first voltage stabilizing didoe DZ1 conducting; load RL voltage clamping, in this conduction value, has been prevented to the continuation of load RL voltage is risen, protected load RL.
The power protecting circuit 20 that the present embodiment proposes, when overcurrent or the short circuit current, cut off output loop by just warm quick resistance PPTC automatically, protected power supply 10 and load RL, when electric current recovers normal, automatically recovers normally work; By the first voltage stabilizing didoe DZ1 conducting when power supply 10 overvoltages are exported, load RL voltage clamping, in this conduction value, is prevented to load RL voltage continues to rise again, protected load RL; Circuit is simple and working stability is reliable.
Further, in the present embodiment, just warm quick resistance PPTC and the first voltage stabilizing didoe DZ1 laminating arrange.Laminating setting herein refer to two components and parts outer packing shell some be in contact with one another, can mutually carry out heat conduction.Certainly, in the present embodiment, just warm quick resistance PPTC can also be to be connected and to carry out mutual heat conduction by Heat Conduction Material with the first voltage stabilizing didoe DZ1.When overvoltage appears in power supply 10; load RL voltage raises; while reaching the conduction value of the first voltage stabilizing didoe DZ1; the first voltage stabilizing didoe DZ1 conducting; shunted one part of current; the first voltage stabilizing didoe DZ1 heating; due to just warm quick resistance PPTC and the first voltage stabilizing didoe DZ1 laminating setting; so the temperature of just warm quick resistance PPTC rises; finally reach Curie point, just warm quick resistance PPTC presents off state, cuts off load RL electric current; not only protect load RL, also protected power supply 10 simultaneously.
Further, with reference to Fig. 2, the power protecting circuit 20 of the present embodiment also comprises alarm indication circuit 21, and alarm indication circuit 21 is in parallel with just warm quick resistance PPTC.Concrete, alarm indication circuit 21 comprises the first light-emitting diode D1 and the first resistance R 1, the positive pole of the first light-emitting diode D1 connects power input A, the negative pole of the first light-emitting diode D1 connects an end of the first resistance R 1, and the other end of the first resistance R 1 connects the negative electrode of the first voltage stabilizing didoe DZ1.
The operation principle of alarm indication circuit 21 is:
When 1, power supply 10 and load RL work, also normally work of just warm quick resistance PPTC, now just warm quick resistance PPTC resistance is less, the voltage at just warm quick resistance PPTC two ends is very little, so the voltage at alarm indication circuit 21 two ends is very little, the first not conducting of light-emitting diode D1, i.e. luminous alarm not;
2, when power supply 10 normal operations, when load RL overcurrent or short circuit, the electric current that flows through just warm quick resistance PPTC increases, just warm quick resistance PPTC heating, finally reach Curie point, and just warm quick resistance PPTC presents off state, it is high-impedance state, the voltage at just warm quick resistance PPTC two ends is very high, so the voltage at alarm indication circuit 21 two ends is very high, the first light-emitting diode D1 conducting is luminous; When electric current recovers normal, the temperature of just warm quick resistance PPTC reduces gradually, and its resistance slowly reduces, and recovers the normally state, and the voltage at just warm quick resistance PPTC two ends is very little, and the first not conducting of light-emitting diode D1, do not work;
3, when overvoltage appears in power supply 10, load RL voltage raises, while reaching the conduction value of the first voltage stabilizing didoe DZ1, the first voltage stabilizing didoe DZ1 conducting, shunted one part of current, the first voltage stabilizing didoe DZ1 heating, because just warm quick resistance PPTC and the first voltage stabilizing didoe DZ1 are installed together, so the temperature of just warm quick resistance PPTC rises, finally reach Curie point, just warm quick resistance PPTC presents off state, and the first light-emitting diode D1 conducting is luminous.
The power protecting circuit 20 of the present embodiment, when occurring that power supply 10 output is undesired, the first light-emitting diode D1 conducting of alarm indication circuit 21 is luminous, and prompting user power supply 10 output faults, facilitate the user to find in time.
Further, the power protecting circuit 20 of the present embodiment also comprises work display circuit 22, and an end of work display circuit 22 connects power input A, and the other end of work display circuit 22 connects power supply 10 negative poles.Concrete, work display circuit 22 comprises the second light-emitting diode D2, the second resistance R 2, the 3rd resistance R 3 and the second voltage stabilizing didoe DZ2, the positive pole of the second light-emitting diode D2 connects power input A, the negative pole of the second light-emitting diode D2 connects an end of the second resistance R 2, the other end of the second resistance R 2 connects the negative electrode of the second voltage stabilizing didoe DZ2, anodic bonding power supply 10 negative poles of the second voltage stabilizing didoe DZ2, the 3rd resistance R 3 is in parallel with voltage stabilizing didoe.
The operation principle of work display circuit 22 is:
1, when power supply 10 external load RL when output, now the output voltage of power supply 10 is lower, the second not conducting of voltage stabilizing didoe DZ2, the 3rd resistance R 3 is the resistance that resistance value ratio is larger, so the pressure drop ratio on the 3rd resistance R 3 is larger, the voltage at the second light-emitting diode D2 two ends is very little, and the second light-emitting diode D2 sends very faint light;
2, when power supply 10 external load RL output, now the output voltage of power supply 10 is higher, reach the conduction value of the second voltage stabilizing didoe DZ2, the second voltage stabilizing didoe DZ2 conducting, the dynamic electric resistor of the second voltage stabilizing didoe DZ2 conducting is little more a lot of than the 3rd resistance R 3, the pressure drop at the second voltage stabilizing didoe DZ2 two ends is less, so the voltage at the second light-emitting diode D2 two ends is larger, the second light-emitting diode D2 sends brighter light.
The second light-emitting diode D2 of the present embodiment is as the working station indicator of power supply 10.
Concrete, in the present embodiment, the first light-emitting diode D1 is red light emitting diodes, the second light-emitting diode D2 is green LED.The first light-emitting diode D1 and the second light-emitting diode D2 laminating arrange.Laminating is arranged in the first embodiment explanation.Certainly, the first light-emitting diode D1 and the second light-emitting diode D2 also can be mutually near arranging, and the light that makes it send may be mixed together.When power supply 10 normal operation and load RL overcurrent or short circuit or when overvoltage appears in power supply 10, red light is sent in the first light-emitting diode D1 conducting, green light is sent in the second light-emitting diode D2 work simultaneously, because the first light-emitting diode D1 and the second light-emitting diode D2 are installed together, so red light and green light mix and present yellow light, gold-tinted is more eye-catching, better as alarm.
The utility model also proposes a kind of Switching Power Supply, comprises power protecting circuit, this power protecting circuit can comprise earlier figures 1 and embodiment illustrated in fig. 2 in all technical schemes, its concrete structure can, with reference to previous embodiment, not done and repeat at this.
These are only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present utility model.
Claims (9)
1. a power protecting circuit, with power supply, be connected, it is characterized in that, described power protecting circuit is provided with the power input of connection positive source and the power supply output of external load, described power protecting circuit also comprises just warm quick resistance and the first voltage stabilizing didoe, one end of described just warm quick resistance connects described power input, and the other end of described just warm quick resistance connects described power supply output; The negative electrode of described the first voltage stabilizing didoe connects described power supply output, the anodic bonding power cathode of described the first voltage stabilizing didoe.
2. power protecting circuit according to claim 1, is characterized in that, described just warm quick resistance and the laminating of the first voltage stabilizing didoe arrange.
3. power protecting circuit according to claim 1 and 2, is characterized in that, also comprises the alarm indication circuit, and described alarm indication circuit is in parallel with described just warm quick resistance.
4. power protecting circuit according to claim 3; it is characterized in that; described alarm indication circuit comprises the first light-emitting diode and the first resistance; the positive pole of described the first light-emitting diode connects described power input; the negative pole of described the first light-emitting diode connects an end of described the first resistance, and the other end of described the first resistance connects the negative electrode of described the first voltage stabilizing didoe.
5. power protecting circuit according to claim 4, is characterized in that, also comprises the work display circuit, and an end of described work display circuit connects described power input, and the other end of described work display circuit connects described power cathode.
6. power protecting circuit according to claim 5; it is characterized in that; described work display circuit comprises the second light-emitting diode, the second resistance, the 3rd resistance and the second voltage stabilizing didoe; the positive pole of described the second light-emitting diode connects described power input; the negative pole of described the second light-emitting diode connects an end of described the second resistance; the other end of described the second resistance connects the negative electrode of described the second voltage stabilizing didoe; the described power cathode of the anodic bonding of described the second voltage stabilizing didoe, described the 3rd resistance is in parallel with voltage stabilizing didoe.
7. power protecting circuit according to claim 6, is characterized in that, described the first light-emitting diode is red light emitting diodes, and described the second light-emitting diode is green LED.
8. power protecting circuit according to claim 6, is characterized in that, described the first light-emitting diode and the laminating of the second light-emitting diode arrange.
9. a Switching Power Supply, is characterized in that, comprises power protecting circuit as described as any one in claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320360444 CN203368004U (en) | 2013-06-21 | 2013-06-21 | Power supply protection circuit and switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320360444 CN203368004U (en) | 2013-06-21 | 2013-06-21 | Power supply protection circuit and switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203368004U true CN203368004U (en) | 2013-12-25 |
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ID=49815723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320360444 Expired - Fee Related CN203368004U (en) | 2013-06-21 | 2013-06-21 | Power supply protection circuit and switch power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203368004U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917153A (en) * | 2015-05-26 | 2015-09-16 | 谈宁 | Short circuit protection circuit used for parallel-connected power supply |
| CN106356683A (en) * | 2016-10-31 | 2017-01-25 | 维沃移动通信有限公司 | Protection device and mobile terminal |
| CN108988623A (en) * | 2018-08-23 | 2018-12-11 | 深圳市弘粤驱动有限公司 | A kind of short-circuit protection of external load |
| WO2022109936A1 (en) * | 2020-11-24 | 2022-06-02 | 深圳市思倍生电子科技有限公司 | Vehicle starting power supply protection circuit |
-
2013
- 2013-06-21 CN CN 201320360444 patent/CN203368004U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917153A (en) * | 2015-05-26 | 2015-09-16 | 谈宁 | Short circuit protection circuit used for parallel-connected power supply |
| CN106356683A (en) * | 2016-10-31 | 2017-01-25 | 维沃移动通信有限公司 | Protection device and mobile terminal |
| CN108988623A (en) * | 2018-08-23 | 2018-12-11 | 深圳市弘粤驱动有限公司 | A kind of short-circuit protection of external load |
| WO2022109936A1 (en) * | 2020-11-24 | 2022-06-02 | 深圳市思倍生电子科技有限公司 | Vehicle starting power supply protection circuit |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 |