CN201004551Y - A surge protection circuit - Google Patents
A surge protection circuit Download PDFInfo
- Publication number
- CN201004551Y CN201004551Y CNU2007201181688U CN200720118168U CN201004551Y CN 201004551 Y CN201004551 Y CN 201004551Y CN U2007201181688 U CNU2007201181688 U CN U2007201181688U CN 200720118168 U CN200720118168 U CN 200720118168U CN 201004551 Y CN201004551 Y CN 201004551Y
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- CN
- China
- Prior art keywords
- triode
- power supply
- relay
- resistor
- surge protection
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- 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
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Abstract
本实用新型涉及一种浪涌保护电路，包括电源线以及串联在所述电源线上的电阻，还包括并接在所述电阻两端的控制电路，当交流电源正常工作时，所述控制电路导通，使得所述电阻短路。本实用新型所述的浪涌保护电路的抑制浪涌电流效果较好，而且在电源正常工作时，防浪涌电流电路不工作，减小了能量损失，提高了设备的可靠性。
The utility model relates to a surge protection circuit, which includes a power line and a resistor connected in series on the power line, and also includes a control circuit connected in parallel to both ends of the resistance. When the AC power supply works normally, the control circuit conducts pass, shorting the resistor. The surge protection circuit of the utility model has a better effect of suppressing the surge current, and when the power supply works normally, the surge current prevention circuit does not work, which reduces energy loss and improves the reliability of the equipment.
Description
Technical field
The utility model relates to a kind of surge protection circuit, can be applicable in the various electronic products.
Background technology
In some electronic products (for example television set) power circuit, start all can have surge current usually, and this electric current is bigger, for preventing line surge equipment is caused damage, generally all needs to increase on the line surge protection circuit.
As shown in Figure 1, existing surge protection circuit all is to use negative tempperature coefficient thermistor NTC basically, and this resistance is the live wire L end that is connected on power supply.Though this surge protection circuit has good inhibition effect to surge current, this resistance is also worked always when the circuit operate as normal, understands consumed energy like this, and discharges certain heat, and the equipment that makes exists unsafe hidden danger, reliability low.
The utility model content
The technical problems to be solved in the utility model is that the above-mentioned defective at prior art provides a kind of surge protection circuit, and surge current is had extraordinary inhibitory action, reduces the loss of energy, and has improved the reliability of equipment.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of surge protection circuit; comprise power line and be connected on resistance on the described power line; also comprise the control circuit that is attempted by described resistance two ends; when the AC power operate as normal; described control circuit conducting makes described resistive short.
In surge protection circuit described in the utility model, described control circuit comprises triode, exports control element, accessory power supply and relay that high-low level is controlled described triode break-make; The switch of described relay is attempted by the two ends of described resistance, one end of the coil windings of described relay is connected with described accessory power supply, the other end is connected with the collector electrode of described triode, the base stage of described triode is connected with the output of described control element, the grounded emitter of described triode.
In surge protection circuit described in the utility model, described control element is a single-chip microcomputer.
The beneficial effects of the utility model are that the inhibition surge current effect of surge protection circuit described in the utility model is better, and when the power supply operate as normal, anti-surge current circuit is not worked, and has reduced energy loss, has improved the reliability of equipment.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the surge protection circuit of prior art;
Fig. 2 is a surge protection circuit described in the utility model.
Embodiment
As shown in Figure 2, a kind of surge protection circuit comprises power line (its input is L, and output is LOUT), the control circuit that is connected on the resistance R 1 on the power line and is attempted by these resistance R 1 two ends.This control circuit comprises triode Q1, exports control element, accessory power supply STBY 5V and relay R LY1 that high-low level is controlled this triode Q1 break-make; The switch of relay R LY1 is attempted by the two ends of resistance R 1, one end of the coil windings of relay R LY1 is connected with accessory power supply STBY 5V, the other end is connected with the collector electrode c of triode Q1, and the base stage b of triode Q1 is connected with the output of control element, the emitter e ground connection of triode Q1.
Wherein, resistance R 1 can be power resistor, also can be thermistor NTC.Control element can be single-chip microprocessor MCU.Power line can be live wire.
During start, alternating current is from the input of power line L end, and process power resistor R1 is from the output of power line LOUT end, utilize power resistor R1 can suppress surge current, the employed single-chip microprocessor MCU output low level of accessory power supply STBY 5V this moment, triode Q1 is in off state, makes that the electric current of accessory power supply STBY5V can not be through the coil windings of relay R LY1, collector electrode c and the emitter e input ground of triode Q1.
When the AC power operate as normal, single-chip microprocessor MCU output high level, triode Q1 is in conducting state, the electric current of accessory power supply STBY 5V is through the coil windings of relay R LY1, collector electrode c and the emitter e input ground of triode Q1, this moment relay R LY1 switch closure, alternating current is from the input of power line L end, and through the switch of relay R LY1 from the output of power line LOUT end, make and power resistor R1 short circuit therefore can reduce energy loss.
Hence one can see that; the power resistor R1 that adopts in the surge protection circuit described in the utility model is more much bigger than the resistance of temperature-sensitive resistance NTC; it suppresses better effects if; and when the power supply operate as normal; the relay switch closure; make power resistor R1 by short circuit, reduced energy loss, improved the reliability of equipment.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201181688U CN201004551Y (en) | 2007-01-23 | 2007-01-23 | A surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201181688U CN201004551Y (en) | 2007-01-23 | 2007-01-23 | A surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201004551Y true CN201004551Y (en) | 2008-01-09 |
Family
ID=39040094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201181688U Expired - Fee Related CN201004551Y (en) | 2007-01-23 | 2007-01-23 | A surge protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201004551Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064719A (en) * | 2010-11-02 | 2011-05-18 | 深圳创维－Rgb电子有限公司 | LED (Light Emitting Diode) backlight power source circuit, backlight power source and multimedia device |
| CN104640293A (en) * | 2013-11-13 | 2015-05-20 | 深圳市海洋王照明工程有限公司 | Protection circuit |
| CN113991887A (en) * | 2021-10-14 | 2022-01-28 | 柏壹新能源科技(深圳)有限公司 | Wireless charging transmitter and wireless charging system |
-
2007
- 2007-01-23 CN CNU2007201181688U patent/CN201004551Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064719A (en) * | 2010-11-02 | 2011-05-18 | 深圳创维－Rgb电子有限公司 | LED (Light Emitting Diode) backlight power source circuit, backlight power source and multimedia device |
| CN104640293A (en) * | 2013-11-13 | 2015-05-20 | 深圳市海洋王照明工程有限公司 | Protection circuit |
| CN113991887A (en) * | 2021-10-14 | 2022-01-28 | 柏壹新能源科技(深圳)有限公司 | Wireless charging transmitter and wireless charging system |
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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 |
Granted publication date: 20080109 Termination date: 20150123 |
|
| EXPY | Termination of patent right or utility model |