CN107947556A - 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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- CN107947556A CN107947556A CN201711256989.2A CN201711256989A CN107947556A CN 107947556 A CN107947556 A CN 107947556A CN 201711256989 A CN201711256989 A CN 201711256989A CN 107947556 A CN107947556 A CN 107947556A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of Switching Power Supply start-up circuit so that the switch power controller of the integrated start-up circuit of tradition can be applied in the system of more high input voltage.This start-up circuit includes regulator circuit and bleeder circuit.Regulator circuit is made of resistance series circuit, bleeder circuit is made of metal-oxide-semiconductor, regulator circuit is connected to input voltage both ends, and for providing a stable grid voltage, bleeder circuit is used to input voltage being divided into metal-oxide-semiconductor drain-source voltage and controller start-up circuit voltage two parts.Above-mentioned regulator circuit and bleeder circuit can use plural serial stage, therefore the switch power controller of the integrated start-up circuit of tradition can be applied to very high input voltage system.
Description
Technical field
The present invention relates to the start-up circuit of Switching Power Supply, more particularly to Switching Power Supply.
Background technology
In three-phase and four-line electric power system, its line voltage usually all can be very high, while in order to ensure in the case where falling phase,
System accessory power supply can work normally, it is desirable to and the input voltage range of system accessory power supply is very wide, generally reach 85~
528VAC.Therefore the design of system accessory power supply is with regard to relatively difficult, the especially design of high-voltage starting circuit.
For without the switch power controller of integrated start-up circuit, Starting mode is usually to be reached by a resistance value on the market
It is connected to the other resistance that starts of mega-ohms between power input voltage and start-up capacitance, there is provided starting current charges start-up capacitance
To complete the startup of controller.After start-up course, extra power consumption will be increased by starting the presence of resistance.Meanwhile by
It is very wide in input voltage range, it is difficult to which balance is obtained between on startup between stand-by power consumption.
Switch power controller for integrating start-up circuit on the market, its operation principle are：Using built in controller
One high voltage transistor takes electricity from power input, charges to start-up capacitance, and high voltage transistor is controlled by controller, works as controller
Complete after starting, be shut off high voltage transistor, more preferable stand-by power consumption can be obtained.This Starting mode is short with the time is started
And stand-by power consumption it is low the advantages of, simultaneously because start-up circuit is integrated in inside controller, also with small low with cost excellent
Point.
But 750VDC is generally reached after the busbar voltage rectification of three-phase four wire system, and this be internally integrated starts electricity
The switch power controller on road, the general pressure voltage of its integrated start-up circuit only have 500~700VDC or so, are unsatisfactory for three-phase
The design requirement of four-wire system accessory power supply.
Thus, it is necessary to high-voltage starting circuit is improved so that the Switching Power Supply control of the integrated start-up circuit of tradition
Device can be applied in the system of more high input voltage and (be not limited to three-phase four wire system).
The content of the invention
It is to solve that tradition is integrated in order to solve the above technical problem, the present invention provides a kind of Switching Power Supply start-up circuit
The switch power controller of start-up circuit is applied to the problem of system of more high input voltage.
The present invention is achieved through the following technical solutions, a kind of Switching Power Supply start-up circuit, it is characterised in that：Including steady
Volt circuit and bleeder circuit.Bleeder circuit includes n metal-oxide-semiconductor, and regulator circuit includes n+1 resistance, and n is whole more than or equal to 1
Number；
N+1 resistance is sequentially connected in series, the input of the other end connecting valve power supply of first resistor, the (n+1)th resistance it is another
The input cathode of one end connecting valve power supply；
The source electrode of first metal-oxide-semiconductor is connected to the internal activation circuitry input terminal of switch power controller, n-th metal-oxide-semiconductor
Drain electrode is connected to the input cathode of Switching Power Supply, remaining each metal-oxide-semiconductor drain electrode and source electrode are sequentially connected；The grid of first metal-oxide-semiconductor
Connect the series connection node of first resistor and second resistance, the grid connection second resistance of the second metal-oxide-semiconductor and connecting for 3rd resistor
Node, the grid of n-th of metal-oxide-semiconductor connect the series connection node of the n-th resistance and the (n+1)th resistance.
Preferably, a kind of Switching Power Supply start-up circuit further includes a current-limiting resistance, one end of the current-limiting resistance
Connect the drain electrode of n-th of metal-oxide-semiconductor, the input cathode of the other end connecting valve power supply of the current-limiting resistance.
Preferably, a kind of Switching Power Supply start-up circuit further includes n diode, the cathode connection of the diode
To the grid of n-th of metal-oxide-semiconductor, the anode of the diode is connected to the source electrode of n-th of metal-oxide-semiconductor.
Preferably, a kind of Switching Power Supply start-up circuit further includes n+1 capacitance, and the first capacitance is connected in parallel on the first electricity
The both ends of resistance, the second capacitance are connected in parallel on the both ends of second resistance, and the (n+1)th capacitance is connected in parallel on the both ends of the (n+1)th resistance.
Above-mentioned regulator circuit and bleeder circuit can use plural serial stage, therefore can be by the integrated start-up circuit of tradition
Switch power controller is applied to very high input voltage system.
Compared with prior art, the present invention has the advantages that：
1) this programme is solved is applied to more high input voltage by the switch power controller of the integrated start-up circuit of tradition
The problem of system；
2) this programme inherits the advantages of start-up circuit being integrated in switch power controller；
3) for the controller of part, the start-up circuit built in it also have other functions (such as detection input voltage with
Feedforward current is provided), this programme circuit can inherit its function；
4) this programme circuit is simple, and cost is low, easily designed.
Brief description of the drawings
Fig. 1 is the circuit diagram of the embodiment of the present invention one；
Fig. 2 is the circuit diagram of the embodiment of the present invention two；
Fig. 3 is the circuit diagram of the embodiment of the present invention three；
Fig. 4 is the circuit diagram of the embodiment of the present invention four.
First embodiment
In first embodiment, regulator circuit includes resistance R1 and resistance R2, R1 and R2 connect, one end connection of series circuit
The input cathode HVDC of Switching Power Supply, the input of the other end connecting valve power supply of series circuit；Regulator circuit includes metal-oxide-semiconductor
The grid of Q1, Q1 are connected to the tie point of R1 and R2, and the drain electrode of Q1 is connected to the source electrode of input the cathode HVDC, Q1 of Switching Power Supply
The internal activation circuitry input terminal HV pins of switch power controller U1 are connected to, are powered for U1.
Circuit operation principle is as follows：
The grid regulator circuit of metal-oxide-semiconductor Q1 is constituted by resistance R1 and R2., can be with since the input impedance of Q1 is very big
Input voltage Vg is approximately considered, by the potential-divider network of R1 and R2, obtains stable grid voltage-to-ground Vgg.Therefore have following
Formula：
Input voltage Vg divide into the start-up circuit voltage V of the drain-source voltage Vds and U1 of Q1HV.Therefore there is the following formula：
Vg=Vds+VHV
Metal-oxide-semiconductor Q1 is operated in saturation region at this time, and the type of drive of Q1 is source drive, its grid voltage-to-ground is by its voltage stabilizing
Circuit is stablized, and the source electrode above earth potential that its gate source voltage Vgs is about the cut-in voltage VT, Q1 of metal-oxide-semiconductor is：
Vss=VHV=Vgg-Vgs
Joint above formula, obtains：
As long as from above formula as can be seen that selecting the resistance value of suitable R1 and R2, it is possible to adjust the drain-source voltage of Q1
The start-up circuit voltage V of Vds and U1HV.So ensure that the start-up circuit voltage of U1 ensures in rational scope, that is, exist
During the input voltage upper limit, no more than its pressure-resistant specification, while in input voltage lower limit, reach controller internal activation circuitry
Cut-in voltage.
The start-up course of switch power controller is as follows：
Stage one：When input terminal impact input voltage, Vg will be begun to ramp up from 0V, due to having Q1 grid regulator circuits, Q1
Vgg synchronously rise.The start-up circuit voltage V of the drain-source voltage Vds and U1 of Q1HVDivided by above-mentioned voltage distribution principle
Match somebody with somebody.Although the start-up circuit inside U1 does not work also, leakage current is still suffered from, therefore the drain-source current of Q1 is needed equal to U1's
Start-up circuit leakage current.Q1 is operated in saturation workspace at this time, its Vgs is about the startup voltage VT of metal-oxide-semiconductor, is only needed at this time very
Small Vgs voltages, just form " inversion layer ", it is possible to provide faint drain-source current inside metal-oxide-semiconductor.For some controls
The start-up circuit of device, if this stage there is no any leakage current, it is understood that be in cut-off region for Q1.
Stage two：As the V of U1HVWhen reaching the cut-in voltage of internal activation circuitry, the work of its internal activation circuitry, flows through U1
Start-up circuit electric current will become larger suddenly, it is understood that be lower suddenly for the Vss of Q1, i.e. the Vgs of Q1 becomes larger, in metal-oxide-semiconductor
The conducting channel in portion will increase, therefore can provide more drain-source currents.The drain-source current of Q1 will follow U1 to start electricity at this time
The electric current on road.The voltage of Vcc capacitances Ca outside U1 will rise, until controller starts successfully.
Stage three：After controller U1 starts successfully, its internal start-up circuit electric current diminishes until closing, can also manage
Solve and become higher for the Vss of Q1, is i.e. the Vgs of Q1 diminishes, and the conducting channel inside metal-oxide-semiconductor is reduced, until disappearing.
Stage four：For the controller of part, its HV pin also has other functions, such as detection input voltage to carry
For feedforward current.Therefore after controller U1 starts successfully, HV pins still have electric current inflow, therefore the conductive communication in Q1 is not
It can disappear, but still suffer from a Vgs, for providing faint drain-source current.
Summarize above procedure to understand, the Vgs of Q1 has the ability of automatic adjustment, can be equal to Q1 drain-source currents and flow into U1
HV pins electric current.
Second embodiment
On the basis of first embodiment, regulator circuit increase electric capacity of voltage regulation C1 and C2, electric capacity of voltage regulation C1 are connected in parallel on resistance
The both ends of R1, electric capacity of voltage regulation C2 are connected in parallel on the both ends of R2, and the effect of electric capacity of voltage regulation C1 and C2 are to stablize the grid electricity of metal-oxide-semiconductor Q1
Pressure, improves antijamming capability.
In addition, bleeder circuit can also be mainly voltage stabilizing by increasing the effect of diode D1, D1, for protecting metal-oxide-semiconductor
Q1.The cathode of D1 is connected to the grid of metal-oxide-semiconductor Q1, and the anode of D1 is connected to the source electrode of metal-oxide-semiconductor Q1.
Further, bleeder circuit further includes current-limiting resistance Ra, and the drain electrode of metal-oxide-semiconductor Q1 is accessed by current-limiting resistance Ra to be switched
The input cathode HVDC of power supply.Ra's act as limitation size of current, prevents Q1 from being damaged because electric current is excessive.
Operation principle is identical with first embodiment, and details are not described herein.
3rd embodiment
3rd embodiment is that circuit is applied embodiment in more high input voltage, what is different from the first embodiment is that its is steady
Volt circuit adds resistance R3, and R1, R2 and R3 are sequentially connected in series, the input cathode of one end connecting valve power supply of series circuit
HVDC, the input of the other end connecting valve power supply of series circuit；Bleeder circuit increases metal-oxide-semiconductor Q2, and the grid of metal-oxide-semiconductor Q1 connects
The tie point of R1 and R2 are connected to, the drain electrode of metal-oxide-semiconductor Q1 is connected to the source electrode of metal-oxide-semiconductor Q2, and the source electrode of metal-oxide-semiconductor Q1 is connected to switch electricity
The internal activation circuitry input terminal HV pins of source controller U1, the grid of metal-oxide-semiconductor Q2 are connected to the tie point of R2 and R3, metal-oxide-semiconductor
The drain electrode of Q2 is connected to the input cathode HVDC of Switching Power Supply.
The same first embodiment of circuit operation principle, because of metal-oxide-semiconductor Q1 and Q2 series connection partial pressure, therefore can be applicable to input voltage more
High occasion.
Fourth embodiment
On the basis of 3rd embodiment, voltage stabilizing and the metal-oxide-semiconductor series connection bleeder circuit of multistage are further added by.Regulator circuit is by electricity
Hinder R1, R2, R3 to form to Rn+1, metal-oxide-semiconductor series connection bleeder circuit is made of Q1, Q2 to Qn.N is the integer more than or equal to 1.Each
The grid of metal-oxide-semiconductor is connected to the voltage stabilizing node of corresponding resistance series connection, and the source electrode of first metal-oxide-semiconductor is connected to Switching Power Supply control
The internal activation circuitry input terminal HV pins of device U1, the drain electrode of n-th of metal-oxide-semiconductor are connected to the input cathode HVDC of Switching Power Supply,
Remaining each metal-oxide-semiconductor drain electrode and source electrode are sequentially connected.
The same first embodiment of circuit operation principle, because of the plural serial stage partial pressure of metal-oxide-semiconductor, therefore can be applicable to input voltage more
High occasion.
5th embodiment
Unlike fourth embodiment, it is connected in parallel with a capacitor, can opens to each resistance both ends in regulator circuit
Stablize the effect of the grid voltage of metal-oxide-semiconductor, improve antijamming capability.
Preferably, can also a diode in parallel, its effect be mainly between the grid and source electrode of n-th of metal-oxide-semiconductor
Voltage stabilizing, for protecting metal-oxide-semiconductor.The cathode of n-th of diode is connected to the grid of n-th of metal-oxide-semiconductor, the anode of n-th of diode
It is connected to the source electrode of n-th of metal-oxide-semiconductor.
Further, can also connect one between the drain electrode of n-th of metal-oxide-semiconductor and the input cathode HVDC of Switching Power Supply
Current-limiting resistance Ra's, Ra act as limitation size of current, prevents n-th of metal-oxide-semiconductor Qn from being damaged because electric current is excessive.
It the above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
The limitation of the present invention, protection scope of the present invention should be subject to claim limited range.For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, some improvements and modifications can also be made, these change
Protection scope of the present invention is also should be regarded as into retouching.
Claims (5)
- A kind of 1. Switching Power Supply start-up circuit, it is characterised in that：Including regulator circuit and bleeder circuit；Bleeder circuit includes n Metal-oxide-semiconductor, regulator circuit include n+1 resistance, and n is the integer more than or equal to 1；N+1 resistance is sequentially connected in series, the input of the other end connecting valve power supply of first resistor, the other end of the (n+1)th resistance The input cathode of connecting valve power supply；The source electrode of first metal-oxide-semiconductor is connected to the internal activation circuitry input terminal of switch power controller, the drain electrode of n-th of metal-oxide-semiconductor The input cathode of Switching Power Supply is connected to, remaining each metal-oxide-semiconductor drain electrode and source electrode are sequentially connected；The grid connection of first metal-oxide-semiconductor The series connection node of first resistor and second resistance, the grid connection second resistance of the second metal-oxide-semiconductor and the series connection node of 3rd resistor, The grid of n-th of metal-oxide-semiconductor connects the series connection node of the n-th resistance and the (n+1)th resistance.
- A kind of 2. Switching Power Supply start-up circuit according to claim 1, it is characterised in that：Further include a current-limiting resistance, institute The one end for stating current-limiting resistance connects the drain electrode of n-th of metal-oxide-semiconductor, and the input of the other end connecting valve power supply of the current-limiting resistance is just Pole.
- A kind of 3. Switching Power Supply start-up circuit according to claim 1 or 2, it is characterised in that：N diode is further included, The cathode of n-th of diode is connected to the grid of n-th of metal-oxide-semiconductor, and the anode of n-th of diode is connected to n-th The source electrode of metal-oxide-semiconductor.
- A kind of 4. Switching Power Supply start-up circuit according to claim 1 or 2, it is characterised in that：N+1 capacitance is further included, First capacitance is connected in parallel on the both ends of first resistor, and the second capacitance is connected in parallel on the both ends of second resistance, and the (n+1)th capacitance is connected in parallel on n-th+ The both ends of 1 resistance.
- A kind of 5. Switching Power Supply start-up circuit according to claim 3, it is characterised in that：N+1 capacitance is further included, n is Integer more than or equal to 1；First capacitance is connected in parallel on the both ends of first resistor, and the second capacitance is connected in parallel on the both ends of second resistance, and n-th + 1 capacitance is connected in parallel on the both ends of the (n+1)th resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711256989.2A CN107947556A (en) | 2017-12-04 | 2017-12-04 | A kind of Switching Power Supply start-up circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711256989.2A CN107947556A (en) | 2017-12-04 | 2017-12-04 | A kind of Switching Power Supply start-up circuit |
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| CN107947556A true CN107947556A (en) | 2018-04-20 |
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| CN201711256989.2A Withdrawn CN107947556A (en) | 2017-12-04 | 2017-12-04 | A kind of Switching Power Supply start-up circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108566080A (en) * | 2018-05-24 | 2018-09-21 | 广州金升阳科技有限公司 | A kind of started with high voltage and constant current circuit |
| CN109257031A (en) * | 2018-08-01 | 2019-01-22 | 电子科技大学 | One kind being based on the concatenated Precise amplitudes high-voltage square-wave generation circuit of more metal-oxide-semiconductors |
| CN113644818A (en) * | 2021-08-12 | 2021-11-12 | 深圳信息职业技术学院 | A high voltage start-up circuit |
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| CN102158067A (en) * | 2011-04-20 | 2011-08-17 | 广州金升阳科技有限公司 | Starting circuit for switching power supply |
| CN102324849A (en) * | 2011-09-28 | 2012-01-18 | 魏德米勒电联接国际贸易(上海)有限公司 | Flyback switching power supply circuit |
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| CN204216781U (en) * | 2014-11-29 | 2015-03-18 | 广东易事特电源股份有限公司 | A switching power supply starting circuit |
| CN204304789U (en) * | 2014-12-26 | 2015-04-29 | 东莞市奥源电子科技有限公司 | Flyback power supply |
| JP2016146696A (en) * | 2015-02-06 | 2016-08-12 | ローム株式会社 | Switching power supply |
| CN207573236U (en) * | 2017-12-04 | 2018-07-03 | 广州金升阳科技有限公司 | A kind of Switching Power Supply start-up circuit |
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2017
- 2017-12-04 CN CN201711256989.2A patent/CN107947556A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102158067A (en) * | 2011-04-20 | 2011-08-17 | 广州金升阳科技有限公司 | Starting circuit for switching power supply |
| CN102324849A (en) * | 2011-09-28 | 2012-01-18 | 魏德米勒电联接国际贸易(上海)有限公司 | Flyback switching power supply circuit |
| CN204030995U (en) * | 2014-02-19 | 2014-12-17 | 深圳麦格米特电气股份有限公司 | A kind of Switching Power Supply start-up circuit |
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| CN204304789U (en) * | 2014-12-26 | 2015-04-29 | 东莞市奥源电子科技有限公司 | Flyback power supply |
| JP2016146696A (en) * | 2015-02-06 | 2016-08-12 | ローム株式会社 | Switching power supply |
| CN207573236U (en) * | 2017-12-04 | 2018-07-03 | 广州金升阳科技有限公司 | A kind of Switching Power Supply start-up circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108566080A (en) * | 2018-05-24 | 2018-09-21 | 广州金升阳科技有限公司 | A kind of started with high voltage and constant current circuit |
| CN109257031A (en) * | 2018-08-01 | 2019-01-22 | 电子科技大学 | One kind being based on the concatenated Precise amplitudes high-voltage square-wave generation circuit of more metal-oxide-semiconductors |
| CN113644818A (en) * | 2021-08-12 | 2021-11-12 | 深圳信息职业技术学院 | A high voltage start-up circuit |
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