CN201039000Y - A standby protection circuit - Google Patents
A standby protection circuit Download PDFInfo
- Publication number
- CN201039000Y CN201039000Y CNU2007201187824U CN200720118782U CN201039000Y CN 201039000 Y CN201039000 Y CN 201039000Y CN U2007201187824 U CNU2007201187824 U CN U2007201187824U CN 200720118782 U CN200720118782 U CN 200720118782U CN 201039000 Y CN201039000 Y CN 201039000Y
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- circuit
- standby
- triode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a standby protection circuit, which comprises an AC rectifier circuit, a standby circuit which is connected with the rectifier circuit, a standby output part which is connected with the standby circuit, and a standby feedback optical coupler which is connected with the standby output and the standby circuit; wherein, the standby feedback optical coupler is also connected with an output terminal over-voltage protective circuit, and the standby circuit is connected with a primary over-voltage circuit and an over-current protection circuit; by the output terminal over-voltage protective circuit, the primary over-voltage circuit and the over-current protection circuit, the voltage of the feedback standby optical coupler is reduced, the standby circuit is under protecting state, and abnormal voltage output is stopped, thus effectively protecting the load.
Description
[technical field]
The utility model relates to field of switch power, particularly is applied to a kind of idle protection circuit of LCD TV.
[background technology]
More and more higher along with to the energy-conservation requirement of the energy, particularly video class requirement stand-by power consumption is more and more lower to household appliances at present, accomplish the standby low-power consumption, the consumption of power supply self is little when then requiring our standby, so we arise at the historic moment and adopt a main circuit and an auxiliary stand-by circuit in LCD TV, when standby, cut off the power supply of main circuit, when standby, only power to CPU, thereby stand-by circuit can be realized the function of low-power consumption by stand-by circuit.But, when output voltage unusual, protective circuit how effectively when voltage raises, the mode of present most of usefulness is directly to add a voltage stabilizing didoe at output, when voltage raises, is played the effect of a protection by this voltage-stabiliser tube.Yet; use this voltage-stabiliser tube that a shortcoming is arranged; if electric voltage exception rising overlong time; to cause this voltage-stabiliser tube to puncture or Yin Wendu too high and burn out disconnection; after this voltage stabilizing didoe damages, then can not play effective protective effect to the abnormal voltage that raises, thereby cause the standby CPU Opportunity awaiting control for linear chip on the mainboard is broken; weight person causes fire, brings very big loss to the consumer.
[utility model content]
For addressing the above problem, main purpose of the present utility model is to provide a kind of can play effective protective effect idle protection circuit.
For achieving the above object, the technical scheme of this creation is: a kind of idle protection circuit comprises that AC rectification circuit, the stand-by circuit, the standby output that is connected with stand-by circuit that link to each other with rectification circuit and the standby that is connected between standby output and the stand-by circuit feed back optocoupler; Wherein, also be connected with the output overvoltage crowbar with standby feedback optocoupler, and be connected with elementary overvoltage and current foldback circuit with stand-by circuit.
Further, described elementary overvoltage and current foldback circuit include triode Q630 and triode Q631, and the PNP pipe of a pair of symmetry of described triode Q630 and triode Q631 position and NPN pipe can play effective self-locking action after the work.
Further, described triode Q630 base stage is connected standby feedback optocoupler with the continuous back of triode Q631 collector electrode by a diode D630.
Further, be connected to the standby transformer and treat machine chip by a resistance R 631 and a voltage-stabiliser tube Z630 after described triode Q630 collector electrode links to each other with triode Q631 base stage.
Further, described output overvoltage crowbar includes triode Q640, and triode Q640 collector electrode is connected to the feedback optocoupler, and base stage is connected to the standby output by a resistance R 640 and a voltage-stabiliser tube Z640.
Further, described triode Q640 base stage also is connected to a divider resistance R641 and and is used to suppress spike voltage, effectively ensures the stable capacitor C of circuit 640.
Compared to prior art; a kind of idle protection circuit of the utility model is by output overvoltage crowbar and elementary overvoltage and current foldback circuit; the voltage of feedback standby optocoupler is dragged down; make stand-by circuit be in guard mode; stop output abnormality voltage, thereby play the effect of protecting load effectively.
[description of drawings]
Fig. 1 is a functional-block diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
[embodiment]
Please refer to shown in Figure 1, a kind of idle protection circuit of the utility model comprises that AC rectification circuit, the stand-by circuit, the standby output that is connected with stand-by circuit that link to each other with rectification circuit and the standby that is connected between standby output and the stand-by circuit feed back optocoupler; Wherein, also be connected with the output overvoltage crowbar with standby feedback optocoupler, and be connected with elementary overvoltage and current foldback circuit with stand-by circuit.
Please refer to shown in Figure 2ly, elementary overvoltage and current foldback circuit 1 include triode Q630 and triode Q631, and triode Q630 and triode Q631 are the PNP pipe and NPN pipe of a pair of symmetry, can play effective self-locking action after the work.After the triode Q631 conducting, for triode Q631 provides a positive electric current of self-locking, make triode Q631 be in a conducting state all the time by triode Q630, unless the outage, Cai triode Q631 by.Triode Q630 base stage, emitter are connected to resistance R 687 and resistance R 686, and triode Q630 base stage also with after triode Q631 collector electrode links to each other is connected standby feedback optocoupler by a diode D630; Be connected to the standby transformer and treat machine chip by a resistance R 631 and a voltage-stabiliser tube Z630 after triode Q630 collector electrode links to each other with triode Q631 base stage; Triode Q631 base stage also is connected with a capacitor C 630 and a divider resistance R630.Output overvoltage crowbar 2 includes triode Q640, and triode Q640 collector electrode is connected to the feedback optocoupler, and base stage is connected to the standby output by a resistance R 640 and a voltage-stabiliser tube Z640; Triode Q640 base stage also is connected to a divider resistance R641 and suppresses spike voltage in addition, effectively ensures a capacitor C 640 of the stability of protective circuit.
Voltage-stabiliser tube Z640 sets a output voltage the highest; when the feedback regulation circuit malfunction; output voltage raises unusually; when surpassing the setting voltage of voltage-stabiliser tube Z640; the voltage-stabiliser tube reverse breakdown; there is electric current to flow through in the resistance R 640; press in resistance R 641 punishment simultaneously and obtain a magnitude of voltage; this current/voltage makes triode Q640 saturation conduction; with the feedback optocoupler is negative electrode (the 2nd pin) short circuit of light-emitting diode, makes the phototriode saturation conduction in the feedback optocoupler, moves feedback voltage to low level; make stand-by circuit be in guard mode, finish protective effect.And when output overvoltage crowbar 2 lost efficacy; will start elementary overvoltage and current foldback circuit 1 this moment; induce by standby primary induction winding; VCC voltage after the rectification is as the overvoltage sampling voltage of Z630; through resistance R 687; resistance R 686 provides bias voltage for triode Q630; stable loop inefficacy when output voltage; after the unusual rising of output voltage, elementary induction winding induces the voltage of corresponding rising, through diode D620 rectification; Z630 detects overvoltage through voltage-stabiliser tube; make voltage-stabiliser tube Z630 flow through electric current, for triode Q631 provides the base drive electric current, make triode Q631 conducting after process resistance R 631 and the R630 dividing potential drop.After triode Q631 conducting, make also conducting of triode Q630,, make triode Q631 be in a conducting state all the time for triode Q631 provides a self-locking base current; Because of triode Q631 conducting, the feedback optocoupler triode and the FB utmost point are through diode D630, and triode Q631 drags down voltage, and stand-by circuit is closed, thereby effectively protects the safety of output loading.
Most preferred embodiment described above only is that the utility model is set forth and illustrated, but is not limited to disclosed any concrete form, and it is possible carrying out many modifications and variations.
Claims (6)
1. idle protection circuit; comprise; optocoupler is fed back in AC rectification circuit, the stand-by circuit, the standby output that is connected with stand-by circuit that link to each other with rectification circuit and the standby that is connected between standby output and the stand-by circuit; it is characterized in that: also be connected with the output overvoltage crowbar with standby feedback optocoupler, and be connected with elementary overvoltage and current foldback circuit with stand-by circuit.
2. idle protection circuit as claimed in claim 1 is characterized in that: described elementary overvoltage and current foldback circuit include triode Q630 and triode Q631, and described triode Q630 and triode Q631 are the PNP pipe and NPN pipe of a pair of symmetry.
3. idle protection circuit as claimed in claim 2 is characterized in that: described triode Q630 base stage is connected standby feedback optocoupler with the continuous back of triode Q631 collector electrode by a diode D630.
4. idle protection circuit as claimed in claim 2 is characterized in that: be connected to the standby transformer and treat machine chip by a resistance R 631 and a voltage-stabiliser tube Z630 after described triode Q630 collector electrode links to each other with triode Q631 base stage.
5. idle protection circuit as claimed in claim 1; it is characterized in that: described output overvoltage crowbar includes triode Q640; triode Q640 collector electrode is connected to the feedback optocoupler, and base stage is connected to the standby output by a resistance R 640 and a voltage-stabiliser tube Z640.
6. idle protection circuit as claimed in claim 5 is characterized in that: described triode Q640 base stage also is connected to a divider resistance R641 and and is used to suppress spike voltage, effectively ensures the stable capacitor C of circuit 640.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201187824U CN201039000Y (en) | 2007-03-01 | 2007-03-01 | A standby protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201187824U CN201039000Y (en) | 2007-03-01 | 2007-03-01 | A standby protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201039000Y true CN201039000Y (en) | 2008-03-19 |
Family
ID=39211525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201187824U Expired - Fee Related CN201039000Y (en) | 2007-03-01 | 2007-03-01 | A standby protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201039000Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694541A (en) * | 2011-03-24 | 2012-09-26 | 海洋王照明科技股份有限公司 | Self-locking loop circuit |
| CN102709870A (en) * | 2012-06-13 | 2012-10-03 | 青岛海信电器股份有限公司 | Power supply protection circuit and electronic product |
| CN103326325A (en) * | 2013-06-05 | 2013-09-25 | 广州凯盛电子科技有限公司 | Short-circuit and low-voltage protective circuit of output of switching power source |
| CN103683204A (en) * | 2012-09-26 | 2014-03-26 | 深圳市海洋王照明工程有限公司 | Switching power supply over-current protection circuit |
| CN105186843A (en) * | 2015-09-01 | 2015-12-23 | 青岛海信电器股份有限公司 | Protective circuit, feedback unit and backlight drive circuit |
| CN106712519A (en) * | 2016-11-18 | 2017-05-24 | 广州视源电子科技股份有限公司 | Switching power supply circuit |
| WO2018068452A1 (en) * | 2016-10-11 | 2018-04-19 | 深圳创维－Rgb电子有限公司 | Method for reducing power consumption of power supply, power supply automatically reducing power consumption, and television |
| CN109560537A (en) * | 2017-09-27 | 2019-04-02 | 深圳光峰科技股份有限公司 | A kind of optocoupler overvoltage crowbar and associated appliance |
-
2007
- 2007-03-01 CN CNU2007201187824U patent/CN201039000Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694541A (en) * | 2011-03-24 | 2012-09-26 | 海洋王照明科技股份有限公司 | Self-locking loop circuit |
| CN102709870A (en) * | 2012-06-13 | 2012-10-03 | 青岛海信电器股份有限公司 | Power supply protection circuit and electronic product |
| CN103683204A (en) * | 2012-09-26 | 2014-03-26 | 深圳市海洋王照明工程有限公司 | Switching power supply over-current protection circuit |
| CN103326325A (en) * | 2013-06-05 | 2013-09-25 | 广州凯盛电子科技有限公司 | Short-circuit and low-voltage protective circuit of output of switching power source |
| CN103326325B (en) * | 2013-06-05 | 2016-02-24 | 广州凯盛电子科技有限公司 | Switching Power Supply output short-circuit and under-voltage protecting circuit |
| CN105186843A (en) * | 2015-09-01 | 2015-12-23 | 青岛海信电器股份有限公司 | Protective circuit, feedback unit and backlight drive circuit |
| WO2018068452A1 (en) * | 2016-10-11 | 2018-04-19 | 深圳创维－Rgb电子有限公司 | Method for reducing power consumption of power supply, power supply automatically reducing power consumption, and television |
| US10554922B2 (en) | 2016-10-11 | 2020-02-04 | Shenzhen Skyworth-Rgb Electronic Co., Ltd. | Method for reducing power consumption of power supply, power supply automatically reducing power consumption, and television |
| CN106712519A (en) * | 2016-11-18 | 2017-05-24 | 广州视源电子科技股份有限公司 | Switching power supply circuit |
| CN109560537A (en) * | 2017-09-27 | 2019-04-02 | 深圳光峰科技股份有限公司 | A kind of optocoupler overvoltage crowbar and associated appliance |
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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: 20080319 Termination date: 20150301 |
|
| EXPY | Termination of patent right or utility model |