CN201061142Y - Protector for power supply flexible starting instant power off anti-restarting - Google Patents
Protector for power supply flexible starting instant power off anti-restarting Download PDFInfo
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- CN201061142Y CN201061142Y CNU2007201042971U CN200720104297U CN201061142Y CN 201061142 Y CN201061142 Y CN 201061142Y CN U2007201042971 U CNU2007201042971 U CN U2007201042971U CN 200720104297 U CN200720104297 U CN 200720104297U CN 201061142 Y CN201061142 Y CN 201061142Y
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Abstract
The utility model relates to a household electrical appliances, in particular to a protection unit of a television controlled by a computer board for preventing secondary starting caused by transient power-fail of soft starting, belonging to technical field of power supply control for household electrical appliances, which can prevent the system from generating oscillating voltage to form secondary starting during power-fail, power-on or power-off. The utility model is characterized in that a control circuit can automatically output high-potential control voltage to a control terminal of a power supply circuit of a functional IC chip at the moment of power-on or power-off. The utility model has the advantages of simple structure, stable and reliable performance, low manufacturing cost and applicability to various household electrical appliances, in particular to the appliances controlled by the computer board, such as CRT, PDP and LCD television.
Description
Technical field
The utility model relates to household electrical appliance, particularly relates to the protective device of the anti-restarting of soft start instant power-down of the television set of being controlled by the computer plate, belongs to household electrical appliance power supply control technology field.
Background technology
In present existing technology, household electrical appliance often adopt Switching Power Supply or linear power supply, for systemic-function IC chip provides power supply, start IC chip operate as normal.Yet, when moment starts,, easily produce to start and impact owing to the supply voltage shakiness.
Moment power initiation, MCU (program control system) can not normally monitor switch machine machine sequential during the shutdown of power down and switch.
In instant power-down and the switch shutdown process, the complete bleed off of electric energy that power supply itself stores needs a period of time.Function IC chip operation be can start once more because surplus electricity produces oscillating voltage after the power down, restarting and fault are easy to generate.
Summary of the invention
The utility model is at the problem of prior art, provide a kind of when household electrical appliance moments is started surge protection and power down and switch shutdown effectively anti-locking system produce the protective device that oscillating voltage forms the anti-restarting of soft startup of electric power instant power-down of restarting.
Technical characterictic of the present utility model is energy of design in startup and shutdown moments, and from the control end of the power supply circuits of trend function IC chip, the control circuit of output high potential control voltage constitutes protective device.The high potential of output can of short duration cut-out function IC chip power supply circuits, avoided the influence of system voltage fluctuation for function IC chip.
Described in the utility model can be in startup and shutdown moments, from the control end of the power supply circuits of trend function IC chip, the control circuit of output high potential control voltage can be:
The high potential output delay circuit of open and close machine signal controlling;
The voltage comparator output circuit that power supply voltage signal drives:
Voltage delay output circuit and electric capacity accumulation of energy delay circuit output that the RC loop is formed;
Control amplifying circuit and combination thereof that other functions are identical.
During the utility model work; run into the situation that needs to implement protection; protective device is from the control end of the power supply circuits of trend function IC chip; output high potential control voltage; the high potential of output can of short duration cut-out function IC chip power supply circuits, avoided the influence of system voltage fluctuation for function IC chip.
The utility model has the advantages that simple in structure, stable and reliable for performance, low cost of manufacture.Can with various household electrical appliance, particularly relate to electrical equipment, as supporting uses such as CRT (picture tube), PDP (plasma), LCD (liquid crystal) TVs by computer plate control.
Description of drawings
Accompanying drawing 1 is the circuit diagram of power supply control loop of the function IC chip of existing ordinary skill;
Accompanying drawing 2 is the circuit diagram of the utility model embodiment;
Accompanying drawing 3 is the circuit diagram of another embodiment of the utility model.
Embodiment
Embodiment 1:
Fig. 1 is the power-supplying circuit of the function IC chip of existing ordinary skill, and GPIO is the control system unit.The control I/O delivery outlet that sends for single-chip microcomputer or MCU (cyclelog).This circuit comprises that mainly isolating diode D1 can select device IL4148 for use, current limliting and divider resistance R1, R2.Common NPN triode N1, current-limiting resistance R3, R4 and power filtering capacitor C1 form.VO is to systemic-function IC chip operate as normal power supply.VCC is the supply voltage that system switching power supply or linear stabilized power supply are supplied with.
The GPIO mouth is given as NPN triode N1 low level this moment when the circuit operate as normal base stage and emitter are electronegative potential, and triode N1 ends.Supply voltage VCC is by current-limiting resistance R3, and R4 gives systemic-function IC chip power supply behind filter capacitor C1.System's operate as normal.
When the GPIO mouth for high level time output high level greater than 2 volts.Pass through isolating diode D1 this moment, by R1, and triode N1 saturation conduction when the base potential of NPN triode N1 is higher than emitter current potential 0.7V after the R2 dividing potential drop.The current collection that power supply VCC constitutes loop triode N1 this moment by triode N1 and ground is low level very.Function IC chip system is normally deactivated.
When power-supply system moment startup,, the supply voltage shakiness starts impact because just being easy to generate.When instant power-down and switch shutdown, the GPIO mouth can not be by the operating state of set program control NPN triode N1.Supply voltage VCC will constitute discharge loop by self load.Supply voltage discharged fully and needed the regular hour will produce oscillating voltage to produce restarting and cause interference, cause fault this moment.For example PDP (plasma) LCD (liquid crystal) CRT (picture tube) TV just easily causes screen flicker, and sound system produces last or end syllable etc.
Therefore the shortcoming of this circuit is: system when moment starts since supply voltage unstable easily produce to start impact, power supply VCC will can startup IC chip be in labile state at surplus electricity of the moment of shutdown and cause fault in power down and the hard shutdown process.
At above circuit structure, the protective device of the anti-restarting of soft startup of electric power instant power-down described in the utility model, the physical circuit of employing is:
When system starts moment, connect with resistance R 7 and D4 by capacitor C 3.The very for a short time anode that is equivalent to short-circuit condition isolating diode D5 this moment of internal resistance almost is high level near supply voltage during capacitor transient stage, driving N PN triode N1 saturation conduction, the VCC power supply just can directly not be added on the level function IC chip of back when having guaranteed to power on suddenly.
During operate as normal, power supply VCC gives electrochemical capacitor C2 charging by diode D3.
During the shutdown of instant power-down and switch, PNP triode P1 and the isolating diode D2 NPN triode N1 saturation conduction that form high level drive circuit after grade of the electric energy that stores by capacitor C 2 by saturation conduction.The electric energy that power supply overbottom pressure and capacitor C 1 store discharges the loop by NPN triode N1 with the ground formation.Thereby effectively cut off the supply power voltage of function IC.Prevent that it from producing vibration.Thereby effectively prevent the IC chip because surplus electric restarting produces fault.The technical scheme that compare the utility model provides with ordinary skill has solved moment startup impact and instant power-down and switch shutdown because the influence that surplus electricity produces.Directly surplus electricity and oscillating voltage have been eliminated restarting by the triode of saturation conduction effectively with formation loop, ground.
Fig. 2 is the circuit diagram of embodiment 1.
Compare with ordinary skill, this enforcement increases by electrochemical capacitor C3 and resistance R 7 and D4 and constitutes series circuit, common low pressure PNP triode P1, electrochemical capacitor C2, isolating diode D1, D2, D5 (can be switching diode IL4148) and current-limiting resistance R5, R6 forms control unit.Diode D3 and capacitor C 2 constitutes its charging voltages of accumulator and deducts the voltage drop (being 0.7V to the maximum) of diode D3 for the VCC supply voltage, and PNP triode P1 is operated in conducting and cut-off state, and isolating diode D2, D5 prevent that circuit from refluxing.
The operation principle and the control procedure of this circuit below are described.
The very for a short time short circuit power supply VCC that is equivalent to of capacitor C 3 moment internal resistance will be added to the base stage of NPN triode N1 by isolating diode D5 when system moment starts when closing a floodgate power-supply system VCC voltage and is established to stable state system powers up for the first time for some time, make triode N1 be in the saturation conduction state.The supply voltage VCC of this moment will constitute loop (resistance R 3 resistances are less than R4) by resistance R 3 and triode to ground.Therefore function IC chip power supply output voltage is a low level.When supply voltage VCC reached stable state, the internal resistance of capacitor C 3 also increased to infinitely great voltage at this moment and all is added in capacitor C 3 two ends.Resistance R 7 two ends are low level, and then system is in normal operating conditions.
When system's operate as normal, described supply voltage VCC charges to electrochemical capacitor C2 by diode D3, the anode of capacitor C2 voltage over the ground deducts the forward voltage drop (maximum 0.7V) of diode D3 for supply voltage VCC, and VCC is that the base stage voltage to earth is a VCC voltage by the base stage that base resistance R6 is added in PNP triode P1 directly.This moment, the emitter voltage of P1 triode was lower than base voltage.Therefore triode P1 is operated in cut-off state, and the state of NPN triode N1 is by the operating state decision of GPIO mouth in the system.Promptly be operated in Fig. 1 state
When system's power down and switch shutdown, capacitor C 3 and D4 form discharge loop in the described protective circuit.Power supply VCC is along with decline.Because it is that capacitor C 2 voltages will remain unchanged that 2 moments of capacitor C do not have the discharge loop voltage instantaneous not suddenly change, this moment, the emitter voltage of triode P1 just was higher than its base voltage very soon.Triode P1 just is in conducting state and is stored in electric energy in the capacitor C 2 just by the P1 triode, current-limiting resistance R5, and by resistance R 1, the base stage that is added in triode N1 after the R2 dividing potential drop makes triode N1 be in conducting state behind the forward diode D2 of isolation.The electric energy of the surplus electricity of power supply VCC and capacitor C 1 is all by the very fast over the ground release of triode N1 at this moment.The current collection that makes triode N1 very soon is low level very.Thereby eliminated restarting, realized protection.
The difference of this circuit and prior art is: 1. system has overcome when moment starts because the startup that the supply voltage shakiness is brought impact.2. when system's instant power-down and switch shut down, the GPIO mouth can not be by the operating state of the function IC of level after the normal sequencing control.And this enforcement circuit can come the power supply state of controlled function IC chip by the conducting that the situation that detects power down and shutdown is controlled NPN triode N1, has realized protection.
Embodiment 2 is referring to accompanying drawing 3:
Compare with ordinary skill, this implement to increase the control level circuit of being made up of comparator IC1, and the in-phase end of comparator is made up of resistance R 10 and electrochemical capacitor C4, end of oppisite phase by capacitor C 5 with join with power end VCC after diode D7 is in parallel.The output of comparator, current-limiting resistance R12, isolating diode D6 constitutes electrical level output circuit.Its output state is by the comparative voltage decision of comparator in-phase end and end of oppisite phase.
The operation principle and the control procedure of this circuit below are described
Power-supply system VCC voltage charges for electrochemical capacitor C4 by resistance R 10 when system starts combined floodgate moment, its charging capacitor anode its voltage linear that links to each other with the comparator in-phase end is charged to VCC voltage, the very for a short time similar short circuit over the ground of the comparator IC1 end of oppisite phase short circuit this moment comparator that is equivalent to of capacitor C 5 moment internal resistance was output as high level and will be added to the base stage of NPN triode N1 by isolating diode D6 when system powered up for the first time, made triode N1 be in the saturation conduction state.The supply voltage VCC of this moment will constitute loop (resistance R 3 resistances are less than R4) by resistance R 3 and triode to ground.Therefore function IC chip power supply output voltage is a low level.When supply voltage VCC reached stable state, the internal resistance of capacitor C 5 also increased to the backward end comparator that infinitely great this moment, voltage all was added in comparator and is output as low level, and then system is initially located in normal operating conditions.
When system's operate as normal, described supply voltage VCC is added to the in-phase end of comparator by resistance R 10 and capacitor C 4 dividing potential drops, power supply VCC directly is added in the end of oppisite phase of comparator by the diode of reverse isolation, end of oppisite phase voltage ratio in-phase end high this moment of comparator is output as low level, and the state of NPN triode N1 is by the operating state decision of GPIO mouth in the system.Promptly be operated in Fig. 1 state.
When system's power down and switch shutdown, comparator in-phase end capacitor C 4 voltages can not suddenly change in the described protective circuit, and comparator end of oppisite phase voltage reduces with power supply VCC and descends.This moment, comparator in-phase end voltage was higher than end of oppisite phase voltage, and comparator IC1 output voltage is by current-limiting resistance R12, and by resistance R 1, the base stage that is added in triode N1 after the R2 dividing potential drop makes triode N1 be in conducting state behind the forward diode D6 of isolation.The electric energy of the surplus electricity of power supply VCC and capacitor C 1 is all by the very fast over the ground release of triode N1 at this moment.The current collection that makes triode N1 very soon is low level very.Thereby eliminated restarting, realized protection.
In sum, the protective device of the anti-restarting of a kind of soft startup of electric power instant power-down is characterized in that by an energy in startup and shutdown moments, and from the control end of the power supply circuits of trend function IC chip, the control circuit of output high potential control voltage constitutes.
Described control circuit can be: the high potential output delay circuit of open and close machine signal controlling; The voltage comparator output circuit that power supply voltage signal drives: voltage delay output circuit and electric capacity accumulation of energy delay circuit output that the RC loop is formed; Control amplifying circuit and combination thereof that other functions are identical.
Described control circuit is formed by connecting power supply VCC and the electrolytic capacitor C3 of common, the series circuit of resistor R 7, electrolytic capacitor C3, resistor R 7 union ends insert a forward isolating diode D5 and constitute output, and the crystal diode D4 of resistor R 7 a two ends opposite access with electric power polarity in parallel constitutes the back discharge path of electrolytic capacitor C3; Control circuit also comprises the accumulator that is connected in series and is constituted by crystal diode D3 and electrochemical capacitor C2, common low pressure PNP triode P1 forms the switching amplifier unit with bias resistor R6 and is connected with the accumulator that electrochemical capacitor C2 coupled in series constitutes with crystal diode D3, the output of switching amplifier inserts current-limiting resistance R5, isolating diode D2, is connected with control system unit GPIO end.GPIO end in control system unit is connected with forward isolating diode D1.
Described control circuit is connected with capacitor C 4 by resistance R 10 and is constituted the in-phase input end of comparator IC1 after the dividing potential drop by connecting power supply VCC, and power supply VCC directly links to each other with end of oppisite phase and by polarity free capacitor and the inverting input of receiving common formation comparator IC1 after backward diode D7 (can be switching diode IL4148) is in parallel.The output of comparator inserts current-limiting resistance R12, and isolating diode D6 is connected with control system unit GPIO end.GPIO end in control system unit is connected with forward isolating diode D1.
Above-mentioned enforcement has only illustrated two kinds of execution modes of the present utility model.In fact the utility model can have the form of other variation.For example: PNP triode P1 can adopt relay circuit etc.
The above only is a preferred implementation of the present utility model, should be understood that for the person of ordinary skill of the art, under the guiding of the utility model thinking, can also make some improvement and distortion circuit, these improvement and distortion circuit are conspicuous to those skilled in the art.
Claims (4)
1. the protective device of the anti-restarting of a soft startup of electric power instant power-down is characterized in that by an energy in startup and shutdown moments, constituted from the control circuit of the control end output high potential control voltage of the power supply circuits of trend function IC chip.
2. the protective device of the anti-restarting of soft startup of electric power instant power-down according to claim 1 is characterized in that described control circuit can be: the high potential output delay circuit of open and close machine signal controlling; The voltage comparator output circuit that power supply voltage signal drives: voltage delay output circuit and electric capacity accumulation of energy delay circuit output that the RC loop is formed; Control amplifying circuit and combination thereof that other functions are identical.
3. the protective device of the anti-restarting of soft startup of electric power instant power-down according to claim 1, it is characterized in that described control circuit forms by connecting power supply VCC and the electrolytic capacitor (C3) of common, the series circuit of resistor (R7), electrolytic capacitor (C3), resistor (R7) union end insert a forward isolating diode (D5) and constitute output, and the crystal diode (D4) of resistor (R7) two ends opposite access with electric power polarity in parallel constitutes the back discharge path of electrolytic capacitor (C3); Control circuit also comprises the accumulator that is connected in series and is constituted by crystal diode (D3) and electrochemical capacitor (C2), common low pressure PNP triode (P1) is formed the switching amplifier unit with bias resistor (R6) and is connected with the accumulator that electrochemical capacitor (C2) coupled in series constitutes with crystal diode (D3), the output of switching amplifier inserts current-limiting resistance (R5), isolating diode (D2), is connected with control system unit GPIO end.GPIO end in control system unit is connected with forward isolating diode (D1).
4. the protective device of the anti-restarting of soft startup of electric power instant power-down according to claim 1, it is characterized in that described control circuit connects with electric capacity (C4) by resistance (R10) and constitute the in-phase input end of comparator (IC1) after the dividing potential drop by connecting power supply VCC, power supply VCC directly links to each other with end of oppisite phase and by polarity free capacitor and the inverting input of receiving common formation comparator (IC1) after backward diode (D7) is in parallel; The output of comparator inserts current-limiting resistance (R12), and isolating diode (D6) is connected with control system unit GPIO end; GPIO end in control system unit is connected with forward isolating diode (D1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201042971U CN201061142Y (en) | 2007-04-17 | 2007-04-17 | Protector for power supply flexible starting instant power off anti-restarting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201042971U CN201061142Y (en) | 2007-04-17 | 2007-04-17 | Protector for power supply flexible starting instant power off anti-restarting |
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| CN201061142Y true CN201061142Y (en) | 2008-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201042971U Expired - Lifetime CN201061142Y (en) | 2007-04-17 | 2007-04-17 | Protector for power supply flexible starting instant power off anti-restarting |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166166A (en) * | 2011-12-08 | 2013-06-19 | 迈普通信技术股份有限公司 | Hot plug controller protective circuit |
| CN103902928A (en) * | 2014-03-24 | 2014-07-02 | 同方计算机有限公司 | Network physical isolation device |
| CN104184331A (en) * | 2014-08-11 | 2014-12-03 | 苏州汇川技术有限公司 | Flyback switching power supply |
| CN104734516A (en) * | 2015-02-11 | 2015-06-24 | 深圳市航嘉驰源电气股份有限公司 | Switching power supply circuit and computer power supply |
| CN107707233A (en) * | 2017-11-03 | 2018-02-16 | 中国电子科技集团公司第五十四研究所 | A kind of reset circuit for preventing instant power-down from causing secondary reset |
| CN110837287A (en) * | 2019-10-17 | 2020-02-25 | 广州金升阳科技有限公司 | Restart circuit |
| CN113363932A (en) * | 2021-06-07 | 2021-09-07 | 山东建筑大学 | Series short-circuit fault detection and protection circuit based on electrolytic capacitor |
| CN113422352A (en) * | 2021-06-07 | 2021-09-21 | 山东建筑大学 | Strong-current switch circuit capable of automatically detecting short-circuit fault |
-
2007
- 2007-04-17 CN CNU2007201042971U patent/CN201061142Y/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166166A (en) * | 2011-12-08 | 2013-06-19 | 迈普通信技术股份有限公司 | Hot plug controller protective circuit |
| CN103166166B (en) * | 2011-12-08 | 2016-06-01 | 迈普通信技术股份有限公司 | Hot plug controller protective circuit |
| CN103902928A (en) * | 2014-03-24 | 2014-07-02 | 同方计算机有限公司 | Network physical isolation device |
| CN104184331A (en) * | 2014-08-11 | 2014-12-03 | 苏州汇川技术有限公司 | Flyback switching power supply |
| CN104734516A (en) * | 2015-02-11 | 2015-06-24 | 深圳市航嘉驰源电气股份有限公司 | Switching power supply circuit and computer power supply |
| CN104734516B (en) * | 2015-02-11 | 2017-12-15 | 深圳市航嘉驰源电气股份有限公司 | Switching power circuit and computer power supply |
| CN107707233A (en) * | 2017-11-03 | 2018-02-16 | 中国电子科技集团公司第五十四研究所 | A kind of reset circuit for preventing instant power-down from causing secondary reset |
| CN107707233B (en) * | 2017-11-03 | 2020-09-01 | 中国电子科技集团公司第五十四研究所 | Reset circuit for preventing instantaneous power failure from causing secondary reset |
| CN110837287A (en) * | 2019-10-17 | 2020-02-25 | 广州金升阳科技有限公司 | Restart circuit |
| CN110837287B (en) * | 2019-10-17 | 2021-03-02 | 广州金升阳科技有限公司 | Restart circuit |
| CN113363932A (en) * | 2021-06-07 | 2021-09-07 | 山东建筑大学 | Series short-circuit fault detection and protection circuit based on electrolytic capacitor |
| CN113422352A (en) * | 2021-06-07 | 2021-09-21 | 山东建筑大学 | Strong-current switch circuit capable of automatically detecting short-circuit fault |
| CN113422352B (en) * | 2021-06-07 | 2022-06-21 | 山东建筑大学 | Strong-current switch circuit capable of automatically detecting short-circuit fault |
| CN113363932B (en) * | 2021-06-07 | 2022-06-21 | 山东建筑大学 | Series short-circuit fault detection and protection circuit based on electrolytic capacitor |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080514 |