CN204145288U - A kind of Switching Power Supply start-up circuit - Google Patents
A kind of Switching Power Supply start-up circuit Download PDFInfo
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- CN204145288U CN204145288U CN201420463547.0U CN201420463547U CN204145288U CN 204145288 U CN204145288 U CN 204145288U CN 201420463547 U CN201420463547 U CN 201420463547U CN 204145288 U CN204145288 U CN 204145288U
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Abstract
The utility model discloses a kind of Switching Power Supply start-up circuit.This circuit comprises start-oscillation circuit, auxiliary circuit and starting of oscillation control circuit.When chip works on power, in auxiliary circuit, start there is voltage.And auxiliary circuit provides operating voltage, simultaneously for starting of oscillation control circuit is powered for chip.After starting of oscillation control circuit powers on, control switch power start circuit is closed, and is that chip is powered separately by auxiliary circuit.During short trouble, auxiliary circuit voltage reduce, starting of oscillation control circuit then control switch power starting circuit again for chip powers on.The utility model can make Switching Power Supply after short-circuit protection, automatically re-powers rapidly, have the advantages such as stable, reliable and low in energy consumption simultaneously for chip.
Description
Technical field
The utility model relates to a kind of Switching Power Supply start-up circuit, belongs to switch power technology field.
Background technology
Along with the high speed development of power electronic technology, Switching Power Supply starts extensively to enter various electronics, electric equipment field, such as, as the power source special etc. of stored-program control exchange, communication base station, electron detection device, control appliance.
Along with widely using of Switching Power Supply, in order to avoid damaging power consumption equipment or Switching Power Supply as much as possible, Switching Power Supply should consider short-circuit protection function in the design.If destruction, load short circuits or wiring error are suffered in the insulation of Switching Power Supply, all short trouble will be produced.And the transient fault electric current produced during short circuit is tens to tens times of rated current.If short-circuit condition is uncontrolled, consequence is hardly imaginable.Therefore, reliable and stable short-circuit protection is the necessary functions of Switching Power Supply.Short-circuit protection requires that the very short time internal cutting off after short trouble produces exports.But circuit is judged to short circuit, as long as within a period of time, short trouble can be solved.After short circuit problem solves, Switching Power Supply is faced with the problem that inside chip needs to re-power.Therefore how to make re-powering of chip, automatically restoring to normal operating conditions is the important topic that field of switch power faces.
Be in the Chinese utility model of 201020561495.2 in the patent No., disclose a kind of short-circuit protection circuit of Switching Power Supply, when comprising short circuit/recovery detection module for detecting that described switching power circuit system generation output short-circuit or short circuit recover, the reference voltage provided according to counter of having the hiccups selects signal to select the first reference voltage or the second reference voltage and described feedback voltage to compare respectively, exports corresponding signal to the clear input of soft-start module with counter of having the hiccups; Soft-start module is used for carrying out soft start when short circuit/recovery detection module detects system generation output short-circuit; Having the hiccups counter for counting the soft start number of times of soft-start module, providing reference voltage to select signal to short circuit/recovery detection module simultaneously.
Summary of the invention
For the deficiencies in the prior art, technical problem to be solved in the utility model is to provide a kind of Switching Power Supply start-up circuit.
For achieving the above object, the utility model adopts following technical scheme:
A kind of Switching Power Supply start-up circuit, comprises resistance, metal-oxide-semiconductor, electric capacity, triode, diode, adjustable voltage-stabiliser tube;
The grid of described metal-oxide-semiconductor, draining connects DC bus respectively by resistance, and source electrode is by the first capacity earth, and source electrode is connected with the base stage of the first triode with the tie point of described first electric capacity;
The collector electrode of described first triode connects auxiliary circuit power supply, contact resistance between described collector electrode and base stage, described base earth, the power end of described emitter-base bandgap grading connecting valve power supply chips;
Described power end ground connection after electric resistance partial pressure; The reference edge of described adjustable voltage-stabiliser tube is connected with dividing point, plus earth, is connected the first reverse diode between negative electrode with described power end.
Wherein more preferably, described Switching Power Supply start-up circuit also comprises regenerative circuit; Described regenerative circuit comprises resistance, PNP triode;
The emitter-base bandgap grading of described PNP triode connects described power end on the one hand, connects base stage on the other hand by resistance; Collector electrode is connected with the reference edge of described adjustable voltage-stabiliser tube; Described base stage is connected by the negative electrode of described first diode with described adjustable voltage-stabiliser tube.
Wherein more preferably, the reference edge of described adjustable voltage-stabiliser tube, by the second capacity earth, is connected by the collector electrode of resistance with described PNP triode.
Wherein more preferably, described metal-oxide-semiconductor grid be connected the first voltage stabilizing didoe between source electrode;
The negative pole of described first voltage stabilizing didoe connects grid, and positive pole connects source electrode.
Wherein more preferably, the source electrode of described metal-oxide-semiconductor connects described first electric capacity by the second diode;
The positive pole of described second diode connects the source electrode of described metal-oxide-semiconductor, and negative pole connects described first electric capacity.
Wherein more preferably, the emitter-base bandgap grading of described first triode connects described first electric capacity by the 3rd diode;
The positive pole of described 3rd diode connects the emitter-base bandgap grading of described first triode, and negative pole connects described first electric capacity.
Wherein more preferably, described first triode base stage be connected the second voltage stabilizing didoe between ground;
The plus earth of described second voltage stabilizing didoe, negative pole connects the base stage of described first triode.
Wherein more preferably, the emitter-base bandgap grading of described first triode is by the 3rd voltage stabilizing didoe ground connection; The plus earth of described 3rd voltage stabilizing didoe, negative pole connects the emitter-base bandgap grading of described first triode.
Wherein more preferably, described adjustable voltage-stabiliser tube by triode substitute.
Wherein more preferably, described adjustable voltage-stabiliser tube by metal-oxide-semiconductor substitute.
Utilize Switching Power Supply start-up circuit provided by the utility model, not only can provide the normal working voltage of switching power source chip, can make Switching Power Supply after short circuit problem solves, automatically reset output, has the advantages such as stable, reliable, low in energy consumption simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of Switching Power Supply start-up circuit provided by the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Switching Power Supply start-up circuit provided by the utility model is mainly used in Switching Power Supply, and its mentality of designing is similar to hiccup protections.Switching Power Supply is started working, and makes chip enter normal operating state.Once chip output short-circuit fault, protective circuit causes chip to quit work, and trigger switch power starting circuit is started working simultaneously, and chip is re-powered.If fault is not recovered, chip keeps guard mode and quits work.And Switching Power Supply start-up circuit works on, chip is re-powered.And fault is once recover, Switching Power Supply start-up circuit can make Switching Power Supply recover rapidly normal work.
As shown in Figure 1, this Switching Power Supply start-up circuit comprises three parts, is respectively starting of oscillation control circuit, start-oscillation circuit and auxiliary circuit.Wherein, start-oscillation circuit is used for providing starting of oscillation voltage for each chip in Switching Power Supply.When start-oscillation circuit works, capacitor charging and chip starting of oscillation.After chip starting of oscillation, the transformer of Switching Power Supply assists output to start working, and namely auxiliary circuit starts to power on.After auxiliary circuit has voltage, start as chip provides operating voltage.Due to start-oscillation circuit can not simultaneously with auxiliary circuit for chip provides operating voltage, at this moment once auxiliary circuit has voltage, starting of oscillation control circuit is then powered.After starting of oscillation control circuit is powered, represent that chip enters normal operating conditions, then control start-oscillation circuit and close.And once short trouble, auxiliary circuit voltage reduces, starting of oscillation control circuit then controls start-oscillation circuit again for chip powers on.
Starting of oscillation control circuit comprises resistance R1, R2, diode V2 and adjustable voltage-stabiliser tube V3.Power supply VCC is the power end of Switching Power Supply chips.Power supply VCC ground connection after the dividing potential drop of resistance R1, R2, the reference edge of adjustable voltage-stabiliser tube is connected with the tie point of resistance R1, R2, minus earth, is connected reverse diode V2 between anode with power supply VCC.Adjustable voltage-stabiliser tube is connected with the grid of the tie point of diode with the metal-oxide-semiconductor V4 in start-oscillation circuit.It should be noted that, adjustable voltage-stabiliser tube mainly plays on-off action here, and it can adopt the switch element such as metal-oxide-semiconductor, triode to substitute certainly.
In order to ensure the conducting of adjustable voltage-stabiliser tube V3 reliability, starting of oscillation control circuit adds regenerative circuit and filter capacitor C1.Regenerative circuit comprises resistance R3, R4, R5, PNP triode V1, electric capacity C1 and diode V2.In the circuit, the emitter-base bandgap grading of triode V1 meets power supply VCC on the one hand, connects base stage on the other hand by biasing resistor R4; Collector electrode is by resistance R3, electric capacity C1 ground connection; Base stage is by diode V2 connecting resistance R5; The reference edge of adjustable voltage-stabiliser tube is connected with the tie point of the tie point of resistance R1, R2 with resistance R3, electric capacity C1, and plus earth, negative electrode is connected the grid of metal-oxide-semiconductor V4 in start-oscillation circuit with the tie point of resistance R5.When not adopting regenerative circuit, the voltage of R1, R2 tie point is VCC*R2/ (R2+R1).And when adopting regenerative circuit, the voltage of R1, R2 tie point is VCC*R2/ (R2+R1R3/R1+R3).As shown from the above formula, in the two ends parallel resistance of resistance R1, the raising of reference voltage terminal is made.By improving the supply power voltage of reference edge, the conducting of adjustable voltage-stabiliser tube V3 reliability can be guaranteed.
Start-oscillation circuit comprises resistance R6, R7, R8, R9, metal-oxide-semiconductor V4 and electric capacity C2.DC bus DCBUS mono-aspect connects the grid of metal-oxide-semiconductor V4 by resistance R6, R7, R8, is connected the drain electrode of metal-oxide-semiconductor V4 on the other hand by resistance R9.The source capacitance C2 ground connection of V4.In order to protect metal-oxide-semiconductor V4, in this circuit, add voltage stabilizing didoe V5 and diode V6.The source electrode of the positive pole connecting triode V4 of voltage stabilizing didoe V5, negative pole connects the grid of V4.In order to prevent voltage reverse-biased, the source electrode of metal-oxide-semiconductor V4 is connected diode V6 with between electric capacity C2.The positive pole of diode V6 connects the source electrode of V4, and negative pole connects electric capacity C2.Diode V6 is connected with auxiliary circuit with the tie point K of electric capacity C2, connects the power end of chip simultaneously, for chip provides starting of oscillation voltage.
Auxiliary circuit comprises resistance R10, NPN triode V9.The collector electrode of triode connects auxiliary circuit power supply NP VCC on the one hand, is connected on the one hand by resistance R10 with base stage; Base stage is by voltage stabilizing didoe V10 ground connection, and emitter-base bandgap grading is connected with the tie point of electric capacity C2 with diode V6 in start-oscillation circuit by diode V8.In order to increase the stability of circuit, the emitter-base bandgap grading of triode is after diode V8, and by voltage stabilizing didoe V7 ground connection, V7 plus earth, negative pole is connected with diode V8.
Work as booting moment, the starting resistor of DC BUS, after resistance R6, R7, R8, makes metal-oxide-semiconductor V4 conducting.After metal-oxide-semiconductor V4 conducting, DC BUS is then charged to electric capacity C2 by resistance R9.When the voltage of electric capacity C2 is elevated to the starting resistor point of Switching Power Supply chips, chip is then started working.After chip enable, in auxiliary circuit, NP VCC holds as high voltage.Once NP VCC end has voltage, triode V9 just can conducting, and in the control circuit of starting of oscillation simultaneously, VCC is high potential.When VCC high potential, triode V1 conducting.VCC through R1, R3 in parallel with R2 dividing potential drop after, adjustable voltage-stabiliser tube V3 conducting.The grid of metal-oxide-semiconductor V4 is ground connection because of V3 conducting, and current potential reduces and ends, and start-oscillation circuit quits work.
And once power source short-circuit protection, auxiliary circuit quits work, NP VCC terminal voltage is O.And the current potential of VCC end reduces, triode V1 ends.VCC is after the dividing potential drop of resistance R1, R2, and adjustable voltage-stabiliser tube V3 ends because current potential is low, and the current potential of metal-oxide-semiconductor V4 grid raises and conducting.After metal-oxide-semiconductor V4 gate turn-on, DCBUS continues to charge to electric capacity C2 by resistance R9.When electric capacity C2 reaches the cut-in voltage of chip again, chip can restart again, and auxiliary circuit, starting of oscillation control circuit can restart work again.And the faults such as output short-circuit are not when getting rid of, the voltage of auxiliary circuit again can vanishing, and Switching Power Supply start-up circuit then repeats the above-mentioned course of work.
In sum, after Switching Power Supply is started working, enter normal operating state.Once chip output short-circuit fault, protective circuit causes chip to quit work, and trigger switch power starting circuit is started working simultaneously, and chip is re-powered.If fault is not recovered, chip keeps guard mode and quits work.And Switching Power Supply start-up circuit works on, chip is re-powered.And fault is once eliminate, Switching Power Supply start-up circuit can make Switching Power Supply recover rapidly normal work.This Switching Power Supply start-up circuit can make Switching Power Supply after short-circuit protection, automatically re-powers rapidly, have the advantages such as stable, reliable and low in energy consumption simultaneously for chip.
Above Switching Power Supply start-up circuit provided by the utility model is described in detail.For one of ordinary skill in the art, to any apparent change that it does under the prerequisite not deviating from the utility model connotation, all by formation to the utility model infringement of patent right, corresponding legal liabilities will be born.
Claims (10)
1. a Switching Power Supply start-up circuit, is characterized in that comprising resistance, metal-oxide-semiconductor, electric capacity, triode, diode, adjustable voltage-stabiliser tube;
The grid of described metal-oxide-semiconductor, draining connects DC bus respectively by resistance, and source electrode is by the first capacity earth, and source electrode is connected with the base stage of the first triode with the tie point of described first electric capacity;
The collector electrode of described first triode connects auxiliary circuit power supply, contact resistance between described collector electrode and base stage, described base earth, the power end of described emitter-base bandgap grading connecting valve power supply chips;
Described power end ground connection after electric resistance partial pressure; The reference edge of described adjustable voltage-stabiliser tube is connected with dividing point, plus earth, is connected the first reverse diode between negative electrode with described power end.
2. Switching Power Supply start-up circuit as claimed in claim 1, characterized by further comprising regenerative circuit; Described regenerative circuit comprises resistance, PNP triode;
The emitter-base bandgap grading of described PNP triode connects described power end on the one hand, connects base stage on the other hand by resistance; Collector electrode is connected with the reference edge of described adjustable voltage-stabiliser tube; Described base stage is connected by the negative electrode of described first diode with described adjustable voltage-stabiliser tube.
3. Switching Power Supply start-up circuit as claimed in claim 2, is characterized in that:
The reference edge of described adjustable voltage-stabiliser tube, by the second capacity earth, is connected by the collector electrode of resistance with described PNP triode.
4. Switching Power Supply start-up circuit as claimed in claim 1, is characterized in that:
The grid of described metal-oxide-semiconductor be connected the first voltage stabilizing didoe between source electrode;
The negative pole of described first voltage stabilizing didoe connects grid, and positive pole connects source electrode.
5. Switching Power Supply start-up circuit as claimed in claim 1, is characterized in that:
The source electrode of described metal-oxide-semiconductor connects described first electric capacity by the second diode;
The positive pole of described second diode connects the source electrode of described metal-oxide-semiconductor, and negative pole connects described first electric capacity.
6. Switching Power Supply start-up circuit as claimed in claim 1, is characterized in that:
The emitter-base bandgap grading of described first triode connects described first electric capacity by the 3rd diode;
The positive pole of described 3rd diode connects the emitter-base bandgap grading of described first triode, and negative pole connects described first electric capacity.
7. Switching Power Supply start-up circuit as claimed in claim 1, is characterized in that:
The base stage of described first triode be connected the second voltage stabilizing didoe between ground;
The plus earth of described second voltage stabilizing didoe, negative pole connects the base stage of described first triode.
8. Switching Power Supply start-up circuit as claimed in claim 1, is characterized in that:
The emitter-base bandgap grading of described first triode is by the 3rd voltage stabilizing didoe ground connection;
The plus earth of described 3rd voltage stabilizing didoe, negative pole connects the emitter-base bandgap grading of described first triode.
9. Switching Power Supply start-up circuit as claimed in claim 1, is characterized in that:
Described adjustable voltage-stabiliser tube by triode substitute.
10. Switching Power Supply start-up circuit as claimed in claim 1, is characterized in that:
Described adjustable voltage-stabiliser tube by metal-oxide-semiconductor substitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420463547.0U CN204145288U (en) | 2014-08-15 | 2014-08-15 | A kind of Switching Power Supply start-up circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420463547.0U CN204145288U (en) | 2014-08-15 | 2014-08-15 | A kind of Switching Power Supply start-up circuit |
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| CN204145288U true CN204145288U (en) | 2015-02-04 |
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| CN201420463547.0U Expired - Fee Related CN204145288U (en) | 2014-08-15 | 2014-08-15 | A kind of Switching Power Supply start-up circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106033880A (en) * | 2015-03-09 | 2016-10-19 | 何曙光 | Hiccup type protection circuits for DC power supply |
| CN109742937A (en) * | 2019-01-23 | 2019-05-10 | 电子科技大学 | A kind of soft starting circuit with Digital Logic multiplexing control |
| CN112467970A (en) * | 2020-11-12 | 2021-03-09 | 广州市保伦电子有限公司 | Protection circuit for high-voltage self-starting of LLC resonant power supply |
-
2014
- 2014-08-15 CN CN201420463547.0U patent/CN204145288U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106033880A (en) * | 2015-03-09 | 2016-10-19 | 何曙光 | Hiccup type protection circuits for DC power supply |
| CN106033880B (en) * | 2015-03-09 | 2019-01-22 | 广东泓睿科技有限公司 | DC power supply hiccup formula protects circuit |
| CN109742937A (en) * | 2019-01-23 | 2019-05-10 | 电子科技大学 | A kind of soft starting circuit with Digital Logic multiplexing control |
| CN112467970A (en) * | 2020-11-12 | 2021-03-09 | 广州市保伦电子有限公司 | Protection circuit for high-voltage self-starting of LLC resonant power supply |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Switching power supply startup circuit Effective date of registration: 20150618 Granted publication date: 20150204 Pledgee: Beijing technology business factoring Ltd. Pledgor: Beijing Tonlier Energy-saving LLC. Registration number: 2015990000483 |
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| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150204 Termination date: 20170815 |
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| CF01 | Termination of patent right due to non-payment of annual fee |