CN201039001Y - A standby circuit for switch power - Google Patents
A standby circuit for switch power Download PDFInfo
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- CN201039001Y CN201039001Y CNU2007201187858U CN200720118785U CN201039001Y CN 201039001 Y CN201039001 Y CN 201039001Y CN U2007201187858 U CNU2007201187858 U CN U2007201187858U CN 200720118785 U CN200720118785 U CN 200720118785U CN 201039001 Y CN201039001 Y CN 201039001Y
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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 provides a standby circuit of a switch power, which comprises an AC detection circuit. The AC detection circuit comprises a secondary rectifier circuit, a first filter voltage dividing circuit, a first triode, a third resistance, a fourth resistance, and a second triode; wherein, the second rectifier circuit comprises a first diode and a voltage dividing resistance which are connected with each other in series; the AC electricity processed by an EMI filter circuit sequentially passes through the first diode and the voltage dividing resistance of the second rectifier circuit, and are output to the first filter voltage dividing circuit and a basal pole of the first triode; the voltage dividing resistance comprises a first resistance; the first filter voltage dividing circuit comprises a first capacitance and a second capacitance which are connected with each other in parallel; the output terminal of the first filter voltage dividing circuit is grounded; an emitter of the first triode is grounded; a collector of the first triode is output to a third resistance, a fourth resistance, and the basal pole of the second triode which are connected with each other in parallel; the third resistance is connected with the main voltage of the standby control circuit; the fourth resistance is grounded; the emitter of the second triode is grounded; the collector of the second triode is connected with the standby control circuit.
Description
Technical field
The utility model relates to, and relates in particular to a kind of stand-by circuit of Switching Power Supply.
Background technology
Along with more and more higher to requirements of saving energy, at present to household appliances, particularly the video class household appliances require its stand-by power consumption more and more lower.In order to adapt to this demand, LCD TV adopts the mode of operation of a main circuit and an auxiliary stand-by circuit at present, realizes by the oneself power consumption that reduces auxiliary stand-by circuit.
As shown in Figure 1, the input AC electricity arrives accumulator after EMI filtering, AC rectification, accumulator can be big electric capacity, the electric charge that is stored in accumulator divides two-way output, one the tunnel gives main circuit, given the mainboard and the backlight power supply of liquid crystal TV after the conversion of main circuit converter goes out voltage by main circuit: the one tunnel gives readiness control circuit, goes out voltage by the conversion of standby converter and powers to treat machine frame coremaking sheet and indicator light on the mainboard.As long as readiness control circuit has voltage, just work, and this voltage is when having only low minimum voltage point to it always, readiness control circuit just quits work under the situation of not taking other measures.
When television set will be in the rating state, standby CPU sends a starting-up signal, after the control circuit of standby receives starting-up signal, main circuit is started working, thereby the main circuit converter has voltage output, the backlight of LCD TV is lighted, and mainboard is started working, and the user just can see TV programme.
When television set is in standby, the Opportunity awaiting control for linear chip sends the Opportunity awaiting control for linear signal, after the control circuit reception of standby is subjected to standby signal, main circuit is quit work, thereby the main circuit converter does not have voltage output, the backlight of LCD TV is extinguished, and mainboard is not worked, and we only can see that standby indicating lamp is bright.Because of at present more and more higher to the requirement of energy aspect, require energy consumption more and more littler during standby, power consumption will be below 3 watts when being standby. and the power consumption of our LCD TV when working from the small size to the large scale will be at 100 watts between several hectowatts, just the capacity requirement to big electric capacity also increases with the increase of power, when standby, the 220V alternating current of input arrives big electric capacity through the EMI inductance behind rectifying and wave-filtering.Therefore during standby big capacitance stores a lot of electric charges, after when standby, turning off alternating current, be stored on the big electric capacity energy then when the standby very little power consumption consume then and need a period of time, be also to need a period of time after the electric capacity of accumulator drops to the minimum operating voltage of standby thick film piece, even during this period of time turned off AC power, but the thick film circuit module of readiness control circuit still can work under the effect of accumulator, behind the standby converter, still have output voltage, so standby indicating lamp is still bright after standby then having occurred and turning off power supply.
Promptly, when power supply is in holding state, if the user carries out power-off operation, stored a lot of electric charge because high-voltage capacitance is bigger this moment, charge discharge is very slow when user's powered-down, indicator light is wanted bright long time, has brought certain trouble to the user, and promptly the user does not know whether power supply has been turned off, cause sometimes repeatedly repeated switching of user, brought inconvenience to the user.
And, when user's powered-down, readiness control circuit drops to the minimum operating voltage of readiness control circuit from 220V voltage one tunnel, and corresponding electric current will increase to very big when minimum operating voltage, cause unstable properties easily, thereby influence the stability of power supply.
Therefore, there is defective in prior art, needs to improve.
The utility model content
The purpose of this utility model is to provide a kind of stand-by circuit of Switching Power Supply, detect having or not of alternating voltage by increase and turn-off stand-by circuit, can behind user's powered-down, extinguish power supply indicator rapidly, make the user can know immediately that power supply successfully closes.
The technical solution of the utility model is as follows:
A kind of stand-by circuit of Switching Power Supply, it comprises EMI filter circuit, first rectification circuit, accumulator, main circuit, readiness control circuit and Opportunity awaiting control for linear chip, alternating current flows through EMI filter circuit, first rectification circuit, accumulator successively and is transported to main circuit and output, and is transported to readiness control circuit and output by accumulator; Wherein, also comprise AC detection circuit; Described AC detection circuit comprises second rectification circuit, first partial pressure filter circuit, the first triode Q604A, second divider resistance, the 3rd divider resistance and the second triode Q615; Described second rectification circuit comprises the first diode D11 and first divider resistance of series connection; After alternating current after the EMI filter circuit is handled flows through the first diode D11 and divider resistance of described second rectification circuit successively, output to the base stage of first partial pressure filter circuit and the first triode Q604A respectively; Described first divider resistance comprises first resistance R 41; Described first partial pressure filter circuit comprises the first capacitor C 672c and second resistance R 51 in parallel; Its output head grounding; The grounded emitter of the described first triode Q604A, the collector electrode of the first triode Q604A output to the base stage of second divider resistance, the 3rd divider resistance and the second triode Q615 respectively; Described second divider resistance comprises the 3rd resistance R 648, is connected to the principal voltage of readiness control circuit; Described the 3rd divider resistance comprises the 4th resistance R 47, ground connection; The grounded emitter of the described second triode Q615, the collector electrode of the second triode Q615 is connected to readiness control circuit.
Described stand-by circuit, wherein, described AC detection circuit also comprises second partial pressure filter circuit, be arranged between second rectification circuit and first partial pressure filter circuit, the output of second rectification circuit connects the 6th resistance R 50 and second capacitor C 673 and the 5th resistance R 48 in parallel of described second partial pressure filter circuit respectively; The output head grounding of second capacitor C 673 and the 5th resistance R 48; The output of the 6th resistance R 50 is connected with the input of first partial pressure filter circuit.
Described stand-by circuit, wherein, it also comprises the 3rd capacitor C 672A, and is in parallel with described the 3rd divider resistance.
Described stand-by circuit, wherein, described second rectification circuit also comprises second diode, after the first diode D11 is in parallel, is connected in series to described first divider resistance.
Described stand-by circuit, wherein, described first divider resistance also comprises other resistance with first resistance R, 41 serial or parallel connections, perhaps with the resistance group of first resistance R, 41 serial or parallel connections.
Described stand-by circuit, wherein, described second divider resistance also comprises other resistance with the 3rd resistance R 648 serial or parallel connections, perhaps with the resistance group of the 3rd resistance R 648 serial or parallel connections.
Described stand-by circuit, wherein, described the 3rd divider resistance also comprises other resistance with the 4th resistance R 47 serial or parallel connections, perhaps with the resistance group of the 4th resistance R 47 serial or parallel connections.
Described stand-by circuit, wherein, described first triode and/or second triode are MOSFET.
Adopt such scheme, when when the power supply standby, turning off power supply, the utility model detects having or not of alternating voltage by increase and turn-offs stand-by circuit, the standby thick film circuit is quit work, standby working time when greatly having quickened shutdown, turn off the power supply standby indicating lamp and can extinguish rapidly thereby reach standby, can allow the user know at once and turn off power supply; And used circuit structure is simple, and is with low cost, and stand-by power consumption can reach below 1 watt; And because the existence of testing circuit makes power work more stable, reliability is higher, more can adapt to the demand in market.
Description of drawings
Fig. 1 is the stand-by circuit schematic diagram of prior art;
Fig. 2 stand-by circuit schematic diagram of the present utility model;
Fig. 3 is embodiment schematic diagram of AC detection circuit of the present utility model;
Fig. 4 is another embodiment schematic diagram of AC detection circuit of the present utility model.
Embodiment
Below preferred embodiment of the present utility model is described in detail.
The utility model provides a kind of stand-by circuit of Switching Power Supply, as shown in Figure 2, it comprises EMI filter circuit, first rectification circuit, accumulator, main circuit, readiness control circuit and Opportunity awaiting control for linear chip, alternating current flows through EMI filter circuit, first rectification circuit, accumulator successively and is transported to main circuit and output, and is transported to readiness control circuit and output by accumulator; Wherein, the L end is the output phase line (live line), and the N end is output center line (zero line).Described stand-by circuit also comprises AC detection circuit, and the alternating current after the EMI filter circuit is handled also outputs to readiness control circuit through AC detection circuit.In the practical application, can between first rectification circuit, accumulator, main circuit, set up PFC (Power Factor Correction, power factor correction) circuit, can increase the circuit that has been applied in other existing stand-by circuits such as feedback circuit, these prior aries are not given unnecessary details at this yet.
As shown in Figure 3, described AC detection circuit comprises second rectification circuit, first partial pressure filter circuit, the first triode Q604A, second divider resistance, the 3rd divider resistance and the second triode Q615; Described second rectification circuit comprises the first diode D11 and first divider resistance of series connection; After alternating current after the EMI filter circuit is handled flows through the first diode Dl1 and divider resistance of described second rectification circuit successively, output to the base stage of first partial pressure filter circuit and the first triode Q604A respectively.
Described first divider resistance comprises first resistance R 41; Can also comprise other resistance with first resistance R, 41 serial or parallel connections, perhaps with the resistance group of first resistance R, 41 serial or parallel connections.For example with first resistance R 41 and the series resistance group who obtains after another resistance is connected as first divider resistance; Perhaps that this series resistance group is in parallel with other one or more resistance again, obtain a resistance group as first divider resistance.When using, reality adopt a plurality of resistance to help the wiring of PCB as first divider resistance.Following second divider resistance and the 3rd divider resistance are similar with it.
Described first partial pressure filter circuit comprises the first capacitor C 672c and second resistance R 51 in parallel; Its output head grounding is used for the filtering dividing potential drop.
The grounded emitter of the described first triode Q604A, the collector electrode of the first triode Q604A output to the base stage of second divider resistance, the 3rd divider resistance and the second triode Q615 respectively.First triode also can be the MOSFET pipe (Metal-Oxide-Semiconductor Field-Effect-Transistor, Metal-oxide-semicondutor type field effect transistor) of N raceway groove, and second triode also can be the MOSFET pipe of N raceway groove.The operating voltage of MOSFET pipe be the voltage difference of grid and source electrode during greater than 5V this pipe with conducting.The grounded emitter of the described second triode Q615, the collector electrode of the second triode Q615 is connected to readiness control circuit.Second triode also can be MOSFET, specifically as above-mentioned.
As shown in Figure 3,1 pin and 3 pin of the first triode Q604A or the second triode Q615, the conducting resistance of low-voltage MOSFET pipe is very little, and the electric current that bears is also bigger.After turning off AC power supplies, the first triode Q604A does not have base voltage and base current, this pipe ends, VCC by standby transformer self generation to the readiness control circuit power supply, this voltage can be by the auxiliary winding induction of transformer, through rectification, current limliting, provide a stable voltage to thick film circuit after filtering and the voltage stabilizing, this voltage is influenced by the input voltage of accumulator, thick film circuit just stops the work of going up when the voltage of accumulator drops to 80V, stable Vcc voltage by R648 and R47 dividing potential drop after, thereby make the 1 pin place voltage to earth of Q615 make the Q615 conducting greater than 5V, thereby the voltage of the tie point of the thick film circuit of the collector electrode of the described second triode Q615 and stand-by circuit is dropped to the voltage that is lower than 1V, make the thick film circuit module not reach starting resistor and close chip operation, finally reach and close the output voltage purpose.
Thick film circuit can be an ICE3A1565 thick film power module, it has a soft start pin CS pin, be first pin of thick film piece. the thick film piece of other company has does not have this function pin, reach the purpose that realizes this function but stand-by circuit described in the utility model still is applicable to other thick film power module, but circuit to be done some suitable adjustment and could use.Promptly can be with the crus secunda of Q615, promptly the collector electrode of triode can be the drain electrode of MOSFET also, receives second pin of thick film piece, i.e. FB pin, concrete enforcement circuit belongs to prior art, does not give unnecessary details at this.For example, can adopt the utility model circuit to remove to control FB (feedback input end) the function pin of thick film power module of the NCP1010-14 series of ON (ON SEMICONDUCTOR) company, or (SANKENELECTRIC CO is agree on the mountain, the FB function pin of LTE) the STR-6159 FB pin of company, or the thick film power module of the L6590A series of ST company.But different chips need go the pin position controlled difference to some extent, and title also can be different, and this situation should not be construed as the restriction that the utility model is used.The power module of each company has a unified pin position on it, that is exactly that the thick module of each power supply all has a feedback end, though the name meeting that their title has is different, but their effect all will be the same, feed back input pin exactly, generally speaking, the feedback input pin of thick film power module all is to link to each other with the 4th pin of optocoupler.
Described second divider resistance comprises the 3rd resistance R 648, is connected to the principal voltage of readiness control circuit; Described second divider resistance can also comprise other resistance with the 3rd resistance R 648 serial or parallel connections, perhaps with the resistance group of the 3rd resistance R 648 serial or parallel connections.Described second divider resistance connects with the VCC voltage that stand-by circuit produces, thereby constitute bleeder circuit with described the 3rd divider resistance, for the second triode Q615 provides gate drive voltage, and for the first triode Q604A provides collector bias current, promptly the first triode Q604A does not have base voltage and electric current when turning off AC power, the first triode Q604A ends. when alternating voltage, the first triode Q604A has base voltage and collector current, thereby allows the first triode Q604A conducting.
Described the 3rd divider resistance comprises the 4th resistance R 47, ground connection; Described the 3rd divider resistance can also comprise other resistance with the 4th resistance R 47 serial or parallel connections, perhaps with the resistance group of the 4th resistance R 47 serial or parallel connections.
As shown in Figure 4, the AC detection circuit of described stand-by circuit also comprises second partial pressure filter circuit, be arranged between second rectification circuit and first partial pressure filter circuit, the output of second rectification circuit connects the 6th resistance R 50 and second capacitor C 673 and the 5th resistance R 48 in parallel of described second partial pressure filter circuit respectively; The output head grounding of second capacitor C 673 and the 5th resistance R 48; The output of the 6th resistance R 50 is connected with the input of first partial pressure filter circuit.And, the 6th resistance R 50 has also constituted a towering shape RC filter with the first capacitor C 672c, second capacitor C 673 here, filter some spike noises, can improve the stability of circuit, if because there is noise to disturb in the alternating voltage of input, can pass through the first capacitor C 672c, second capacitor C 673 and the 6th resistance R 50, effectively interference signal be filtered. play the effect that improves the stand-by circuit performance.
It can also comprise the 3rd capacitor C 672A, and is in parallel with described the 3rd divider resistance, and the 3rd capacitor C 672A can strobe, and can increase the stability of stand-by circuit.
Described second rectification circuit also comprises second diode, after the first diode D11 is in parallel, is connected in series to described first divider resistance.
Specifically, when alternating current is imported, through the electromagnetic interface filter in the alternating current path, filter some interference signals,, the alternating current of negative half period is excluded again through the D11 rectification, through R41 and R48 dividing potential drop, through C673 energy storage, filtering, voltage after partial is again through R50, provide a base voltage to Q604A after the R51 dividing potential drop current limliting, because of alternating current is arranged, stand-by circuit work under normal circumstances, the collector bias current of Q604A can obtain through R648, thereby makes the Q604A conducting.It is that grid is a low level that the conducting of Q604A causes 1 pin of Q615, and Q615 ends, and the thick film circuit in the stand-by circuit is not constituted any influence, the work period of the normal control switching of standby thick film circuit.
When standby, main circuit is not worked, and display screen is blank screen, and the working condition fundamental sum of standby this moment does not have much variations when normally watching basically, and Q604A is conducting still, and Q615 still ends.This moment, because of having cut off alternating current, D11 did not have voltage and electric current to flow through as after cutting off alternating current again, and the base stage of Q604A does not have base voltage and electric current, and Q604A is cut at once, and in a single day Q604A ends, and then the collector electrode of Q604A is a high level at once, makes the Q615 conducting; Make standby thick film piece stop the work of going up immediately.For example, when the PIN1 pin of the thick film circuit module of stand-by circuit is connected with the collector electrode of the second triode Q615 of described AC detection circuit, this moment, the PIN1 pin voltage of thick film circuit module was pulled near zero volt.Can the standby output voltage be turned off after alternating current is turned off in standby thereby can be implemented in, standby indicating lamp is put out at once at once.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (8)
1. the stand-by circuit of a Switching Power Supply, it comprises EMI filter circuit, first rectification circuit, accumulator, main circuit, readiness control circuit and Opportunity awaiting control for linear chip, alternating current flows through EMI filter circuit, first rectification circuit, accumulator successively and is transported to main circuit and output, and is transported to readiness control circuit and output by accumulator; It is characterized in that, also comprise AC detection circuit;
Described AC detection circuit comprises second rectification circuit, first partial pressure filter circuit, first triode (Q604A), second divider resistance, the 3rd divider resistance and second triode (Q615); Described second rectification circuit comprises first diode (D11) and first divider resistance of series connection; After alternating current after the EMI filter circuit is handled flows through first diode (D11) and divider resistance of described second rectification circuit successively, output to the base stage of first partial pressure filter circuit and first triode (Q604A) respectively; Described first divider resistance comprises first resistance (R41); Described first partial pressure filter circuit comprises first electric capacity (C672c) and second resistance (R51) in parallel; Its output head grounding;
The grounded emitter of described first triode (Q604A), the collector electrode of first triode (Q604A) output to the base stage of second divider resistance, the 3rd divider resistance and second triode (Q615) respectively;
Described second divider resistance comprises the 3rd resistance (R648), is connected to the principal voltage of readiness control circuit;
Described the 3rd divider resistance comprises the 4th resistance (R47), ground connection;
The grounded emitter of described second triode (Q615), the collector electrode of second triode (Q615) is connected to readiness control circuit.
2. stand-by circuit according to claim 1, it is characterized in that, described AC detection circuit also comprises second partial pressure filter circuit, be arranged between second rectification circuit and first partial pressure filter circuit, the output of second rectification circuit connects the 6th resistance (R50) and second electric capacity (C673) and the 5th resistance (R48) in parallel of described second partial pressure filter circuit respectively; The output head grounding of second electric capacity (C673) and the 5th resistance (R48); The output of the 6th resistance (R50) is connected with the input of first partial pressure filter circuit.
3. stand-by circuit according to claim 1 is characterized in that, it also comprises the 3rd electric capacity (C672A), and is in parallel with described the 3rd divider resistance.
4. stand-by circuit according to claim 1 is characterized in that, described second rectification circuit also comprises second diode, after first diode (D11) is in parallel, is connected in series to described first divider resistance.
5. stand-by circuit according to claim 1 is characterized in that, described first divider resistance also comprises other resistance with first resistance (R41) serial or parallel connection, perhaps with the resistance group of first resistance (R41) serial or parallel connection.
6. stand-by circuit according to claim 1 is characterized in that, described second divider resistance also comprises other resistance with the 3rd resistance (R648) serial or parallel connection, perhaps with the resistance group of the 3rd resistance (R648) serial or parallel connection.
7. stand-by circuit according to claim 1 is characterized in that, described the 3rd divider resistance also comprises other resistance with the 4th resistance (R47) serial or parallel connection, perhaps with the resistance group of the 4th resistance (R47) serial or parallel connection.
8. according to the arbitrary described stand-by circuit of claim 1 to 7, it is characterized in that described first triode and/or second triode are MOSFET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201187858U CN201039001Y (en) | 2007-02-28 | 2007-02-28 | A standby circuit for switch power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201187858U CN201039001Y (en) | 2007-02-28 | 2007-02-28 | A standby circuit for switch power |
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| Publication Number | Publication Date |
|---|---|
| CN201039001Y true CN201039001Y (en) | 2008-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201187858U Expired - Fee Related CN201039001Y (en) | 2007-02-28 | 2007-02-28 | A standby circuit for switch power |
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| CN (1) | CN201039001Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916573A (en) * | 2012-11-09 | 2013-02-06 | 福建捷联电子有限公司 | Vcc power supply voltage starting circuit of power factor corrector (PFC) and switching power supply applying Vcc power supply voltage starting circuit |
| CN103476175A (en) * | 2013-09-06 | 2013-12-25 | 惠州三华工业有限公司 | LED backlight circuit of liquid crystal display screen |
| CN103499935A (en) * | 2013-09-02 | 2014-01-08 | 胡润泽 | Zero-power-consumption intelligent standby power saver |
| CN112217499A (en) * | 2020-11-06 | 2021-01-12 | 成都扭了么网络科技有限公司 | Drive control apparatus, method and storage medium for a plurality of electromechanical interlocks |
-
2007
- 2007-02-28 CN CNU2007201187858U patent/CN201039001Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916573A (en) * | 2012-11-09 | 2013-02-06 | 福建捷联电子有限公司 | Vcc power supply voltage starting circuit of power factor corrector (PFC) and switching power supply applying Vcc power supply voltage starting circuit |
| CN103499935A (en) * | 2013-09-02 | 2014-01-08 | 胡润泽 | Zero-power-consumption intelligent standby power saver |
| CN103499935B (en) * | 2013-09-02 | 2017-03-15 | 深圳润泽创新能源科技有限公司 | Zero-power-consumptiintelligent intelligent standby power saver |
| CN103476175A (en) * | 2013-09-06 | 2013-12-25 | 惠州三华工业有限公司 | LED backlight circuit of liquid crystal display screen |
| CN103476175B (en) * | 2013-09-06 | 2015-06-24 | 惠州三华工业有限公司 | LED backlight circuit of liquid crystal display screen |
| CN112217499A (en) * | 2020-11-06 | 2021-01-12 | 成都扭了么网络科技有限公司 | Drive control apparatus, method and storage medium for a plurality of electromechanical interlocks |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080319 Termination date: 20150228 |
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| EXPY | Termination of patent right or utility model |