CN202978233U - Direction-current power source protection device - Google Patents
Direction-current power source protection device Download PDFInfo
- Publication number
- CN202978233U CN202978233U CN 201220624983 CN201220624983U CN202978233U CN 202978233 U CN202978233 U CN 202978233U CN 201220624983 CN201220624983 CN 201220624983 CN 201220624983 U CN201220624983 U CN 201220624983U CN 202978233 U CN202978233 U CN 202978233U
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- power source
- voltage
- power supply
- detection circuit
- switching tube
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Abstract
The utility model relates to a direction-current power source protection device. An MOS switching tube is added between a power source input end and a power source output end; an overvoltage detection circuit and an under-voltage detection circuit are added between the power source input end and the MOS switching tube; and over-voltage, under-voltage and directional cut-off protection of power source voltage can be realized through a triode assembly. With the direction-current power source protection device adopted, power supplying equipment and powered equipment can be effectively protected from being damaged; usage environment of an entire system can be extended; the stability of the entire system can be improved; and the service life of the entire system can be prolonged.
Description
Technical field
The utility model relates to a kind of apparatus for protecting power supply, particularly relates to a kind of apparatus for protecting power supply of direct current.
Background technology
Usually LCD TV adopts Alternating Current Power Supply, and there is the AC-DC change-over circuit TV inside, and it is direct current 10-16V that the supply power voltage of the signal-processing board of movement requires.And at the engineering type of some purposes, for example with battery as power supply, the voltage fluctuation after its battery charging and discharging is very large, the use in improper scope will affect the useful life of whole system equipment, even overcharge and cross to put to cause the whole system damage.So need to be at Power supply place's increase supply voltage defencive function of signal-processing board.
Use novel content
The utility model is for addressing the above problem, characteristic by voltage stabilizing didoe and field effect transistor, the basic devices such as combined resistance, electric capacity, triode, consist of the protective circuit of supply voltage, the equipment that the mains fluctuations scope is larger is effectively protected, prevented that informal use from causing power supply unit and power consumption equipment to damage; By increase over-voltage detection circuit in supply line, limit the maximum magnitude of input voltage; Increase undervoltage detection circuit in supply line, limit the minimum zone of input voltage; Increase the reverse protection device in supply line, prevent from causing whole system to damage after the direct current supply Opposite direction connection.
The utility model adopts following technical scheme: a kind of apparatus for protecting power supply of direct current increases the MOS switching tube between power supply input and power supply output.
In technique scheme, increase by an over-voltage detection circuit between described power input and MOS switching tube.
In technique scheme, increase by a undervoltage detection circuit between described power input and MOS switching tube.
In technique scheme, described over-voltage detection circuit, undervoltage detection circuit make up with the MOS switching tube by triode and are connected.
Can find out from architectural feature of the present utility model, the utility model has the advantage of: this device can effectively protect power supply unit and power consumption equipment in order to avoid damage, and has expanded environment for use and the stability of whole system, has extended the useful life of whole system.
Description of drawings
The utility model will illustrate by embodiment and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is system block diagram of the present utility model;
Fig. 2 is practice circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
As shown in Figure 1; the protective device of this DC power supply is the operating characteristic of utilizing diode and field effect transistor; the basic device such as combined resistance, triode is realized its defencive function; take battery as the power supply of LCD TV as example; charge-discharge characteristic according to battery; the direct current output interface of battery or the direct current input interface of LCD TV are increased this protective device, effectively prevented the damage of whole system.
This device mainly comprises three kinds of functions, overvoltage tripping protection, under-voltage tripping protection and reverse tripping protection, wherein:
The overvoltage tripping protection guarantees that the supply power voltage of signal-processing board is in rational scope, prevents from causing because the input voltage of signal plate is too high signal-processing board to damage, and automatically cuts off power supply during higher than preset value at its supply voltage;
Under-voltage tripping protection, the supply power voltage that guarantees signal-processing board is in rational scope, prevent from causing because the input voltage of signal plate is too low the signal-processing board can not be normal, damage power supply unit such as battery pack, automatically cut off power supply at its supply voltage during lower than preset value;
Oppositely tripping protection, because engineering type complete machine and power supply unit are separable, often plug for electric connection line, and this defencive function prevents DC power supply both positive and negative polarity reverse-connection damage whole system, and the electric power system cut-out is not worked when its reversal connection.
As shown in Figure 2, this is the circuit diagram of practice on certain LCD TV, and the maximum supply district of this LCD TV signal-processing board is 10-16V, and setting and the operation principle of its overvoltage and under-voltage protection point are as follows.
Overvoltage tripping protection point: 15.7V, when input supply voltage during greater than 15.7V, the Q1 conducting, the Q2 cut-off, U1 turn-offs, and namely power output socket CON2 does not have Voltage-output.
Under-voltage tripping protection point: 10V, during less than 10V, R14 and R15 resistance voltage testing circuit branch pressure voltage will be less than 0.7V when input supply voltage, the Q3 cut-off, the Q4 conducting, the Q2 cut-off, U1 turn-offs, and namely power output socket CON2 does not have Voltage-output.
Reverse tripping protection: when the input power error-polarity connection, MOS switching tube U1 can not conducting, and the path between cut off the electricity supply input and output makes rear utmost point signal-processing board can not form complete loops, guarantees that security of system is stable.
Disclosed all features in this specification except mutually exclusive feature, all can make up by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or similar characteristics.
The above is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (4)
1. the apparatus for protecting power supply of a direct current, is characterized by increase MOS switching tube between power supply input and power supply output.
2. the apparatus for protecting power supply of a kind of direct current according to claim 1, is characterized by increase by one over-voltage detection circuit between power input and MOS switching tube.
3. the apparatus for protecting power supply of a kind of direct current according to claim 2, is characterized by increase by one undervoltage detection circuit between power input and MOS switching tube.
4. the apparatus for protecting power supply of a kind of direct current according to claim 3 is characterized by described over-voltage detection circuit, undervoltage detection circuit and makes up with the MOS switching tube by triode and be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220624983 CN202978233U (en) | 2012-11-23 | 2012-11-23 | Direction-current power source protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220624983 CN202978233U (en) | 2012-11-23 | 2012-11-23 | Direction-current power source protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202978233U true CN202978233U (en) | 2013-06-05 |
Family
ID=48519260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220624983 Expired - Fee Related CN202978233U (en) | 2012-11-23 | 2012-11-23 | Direction-current power source protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202978233U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577963A (en) * | 2014-08-13 | 2015-04-29 | 浪潮电子信息产业股份有限公司 | Method for designing input power protective circuit of server |
| CN105305797A (en) * | 2015-10-15 | 2016-02-03 | 中国兵器工业集团第二一四研究所苏州研发中心 | Overvoltage and undervoltage protection circuit for output of DC/DC power supply |
| WO2018028446A1 (en) * | 2016-08-12 | 2018-02-15 | 上海路傲电子科技有限公司 | Integrated circuit, linear constant-current drive circuit, and control method therefor |
| WO2022116309A1 (en) * | 2020-12-01 | 2022-06-09 | 深圳市华星光电半导体显示技术有限公司 | Timing control driving board, display panel, and display device |
-
2012
- 2012-11-23 CN CN 201220624983 patent/CN202978233U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577963A (en) * | 2014-08-13 | 2015-04-29 | 浪潮电子信息产业股份有限公司 | Method for designing input power protective circuit of server |
| CN105305797A (en) * | 2015-10-15 | 2016-02-03 | 中国兵器工业集团第二一四研究所苏州研发中心 | Overvoltage and undervoltage protection circuit for output of DC/DC power supply |
| CN105305797B (en) * | 2015-10-15 | 2017-11-14 | 中国兵器工业集团第二一四研究所苏州研发中心 | A kind of DC/DC power supplys output overvoltage under-voltage protecting circuit |
| WO2018028446A1 (en) * | 2016-08-12 | 2018-02-15 | 上海路傲电子科技有限公司 | Integrated circuit, linear constant-current drive circuit, and control method therefor |
| WO2022116309A1 (en) * | 2020-12-01 | 2022-06-09 | 深圳市华星光电半导体显示技术有限公司 | Timing control driving board, display panel, and display device |
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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: 20130605 Termination date: 20151123 |