CN207459989U - A kind of start-up circuit of super wide voltage accessory power supply PWM chip - Google Patents
A kind of start-up circuit of super wide voltage accessory power supply PWM chip Download PDFInfo
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- CN207459989U CN207459989U CN201721272768.XU CN201721272768U CN207459989U CN 207459989 U CN207459989 U CN 207459989U CN 201721272768 U CN201721272768 U CN 201721272768U CN 207459989 U CN207459989 U CN 207459989U
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Abstract
The utility model discloses a kind of start-up circuit of super wide voltage accessory power supply PWM chip, including voltage changeover switch circuit, voltage detecting circuit and charging circuit；Voltage changeover switch circuit is made of metal-oxide-semiconductor Q1, resistance R4 and resistance R5；Voltage detecting circuit is made of metal-oxide-semiconductor Q2, resistance R7 and resistance R8；Charging circuit is made of resistance R1 and resistance R2.The start-up circuit of the super wide voltage accessory power supply PWM chip, no matter what kind of variation of input voltage, is stable to charging current to PWM chip VCC, relative variation is small；In power failure, chip can restart, and will not enter locking state, after troubleshooting, can restart, power-off restarting is not required, particularly depress work in extra-high voltage, circuit loss is compared much smaller with custom circuit.
Description
Technical field
The utility model is related to power module and Switching Power Supply PWM auxiliary power start circuits, more particularly to a kind of ultra-wide
The start-up circuit of voltage accessory power supply PWM chip.
Background technology
In photovoltaic DC-to-AC converter, super high voltage direct current electricity transmission system, the non-constant width of voltage model state down to a hectovolt, is up to four
Thousand more lie prostrate, so system catch help power supply be difficult design, the design that especially high pressure shoulder moves circuit is extremely difficult, on the one hand need seek
The electronic component of high pressure can be born by looking for, and on the other hand from the aspect of reliability, shoulder need to be moved the circuit Sun Hao Minus of part
It is small, prevent key components fever damage.
Currently used Switching Power Supply start-up circuit（As shown in Figure 1）, due to resistance R1 always with power input VIN phases
Connect, the power consumption P generated thereon=（VIN-VCC）2/R1, it is clear that if in the case that Switching Power Supply is operated in high input voltage,
Power consumption on resistance R1 will be very big, it will influences electricity Yuan Zhuan Change efficiency, heat dissipation and reliability, while must select big work(
Rate resistance makes Switching Power Supply volume larger, of high cost.
The existing above-mentioned resistance R1 power consumptions of solution are with the method for topic, as shown in Fig. 2, being operated in high input voltage in Switching Power Supply
In the case of, switching tube Q2 needs to bear high voltage, and is difficult to find that the device that can bear high pressure on the market, even if there is high pressure
IGBT pipes can be selected, and cost is very high, and there is risk out of stock using less.
Utility model content
A kind of input of super wide range the purpose of this utility model is to provide low-loss, low cost, high reliability is opened
The start-up circuit in powered-down source, solves the problems of the prior art.
To achieve the above object, the utility model provides following technical solution：A kind of super wide voltage accessory power supply PWM chip
Start-up circuit, including voltage changeover switch circuit, voltage detecting circuit and charging circuit；Voltage changeover switch circuit is by MOS
Pipe Q1, resistance R4 and resistance R5 compositions；Voltage detecting circuit is made of metal-oxide-semiconductor Q2, resistance R7 and resistance R8；Charging circuit is by electricity
Hinder R1 and resistance R2 compositions；The drain electrode of metal-oxide-semiconductor Q1 is connected to one end of resistance R1 and resistance R2, and the another of resistance R1 terminates to electricity
Input interface+Vin ends are pressed, the other end of resistance R2 is connected to the source electrode of metal-oxide-semiconductor Q1 and the source electrode of metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q1's
Grid is connected with the drain electrode of metal-oxide-semiconductor Q2；The grid of metal-oxide-semiconductor Q1 connects with being also connected with resistance R4 on the connecting line of the drain electrode of metal-oxide-semiconductor Q2
The source electrode of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 are coupled with to control source interface+Vin ends and connection resistance R5；Resistance R2's is another
One end is also attached to the anode of capacitance C1 and the cathode of diode D1, and the cathode series resistance R8 of capacitance C1 is connected to metal-oxide-semiconductor Q2's
Grid is simultaneously grounded；The anode of diode D1 is grounded after being connected with auxiliary winding N1；The grid of metal-oxide-semiconductor Q2 also series resistance R7 is connected to
Control source interface+Vin ends.
Preferably, the Width funtion of the control source interface+Vin ends input is 200V-600VDC
Compared with prior art, the beneficial effects of the utility model are as follows：
The start-up circuit of this super wide voltage accessory power supply PWM chip, no matter what kind of variation of input voltage, to PWM chip
VCC is stable to charging current, and relative variation is small；Control source can be wide to 20 times or more；In high voltage input
In the case of, the loss of start-up circuit is very small；In power failure, chip can restart, and will not enter locked
State after troubleshooting, can restart, power-off restarting is not required, and particularly depress work, circuit damage in extra-high voltage
Consumption is compared much smaller with custom circuit.
Description of the drawings
Fig. 1 is the common Switching Power Supply start-up circuit figure of the utility model；
Fig. 2 is that the common Switching Power Supply start-up circuit of the utility model adds in current source circuit figure；
Fig. 3 is the utility model basic circuit diagram；
The two level that Fig. 4 is Fig. 3 of the present invention divides series circuit figure；
The three-level that Fig. 5 is Fig. 3 of the present invention divides series circuit figure.
In figure：1 voltage changeover switch circuit, 2 voltage detecting circuits, 3 charging circuits.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained shall fall within the protection scope of the present invention.
Referring to Fig. 1, currently used Switching Power Supply start-up circuit, including power resistor R1, capacitance C1, zener diode
ZD1, auxiliary winding N1 and diode D1, operation principle are：In power initiation moment, power supply is by power resistor R1 to electricity
Hold C1 to charge, the electric current flowed through on resistance R1 is more than the starting current of control IC, and the voltage of capacitance C1 rises to control IC
Normal working voltage after, power supply start to work.After start-up circuit output voltage stabilization, the voltage of auxiliary winding N1 generations
Control IC power supplies are given after diode D1 rectifications and capacitance C1 filtering, the VCC of IC is controlled to stablize in certain voltage model state,
Power supply works normally.When input voltage VIN model state is wider, in order to guarantee in minimum input voltage, IC is provided in order to control
Sufficiently large shoulder streaming current, enables Switching Power Supply normally to start, then the resistance value of resistance R1 cannot be too big.Due to resistance R1 mono-
Directly it is connected with power input VIN, the power consumption P generated thereon=（VIN-VCC）2/R1, it is clear that if when Switching Power Supply works
In the case of high input voltage, power consumption on resistance R1 will be very big, it will influences electricity Yuan Zhuan Change efficiency, heat dissipation and reliable
Property, while high-power resistance must be selected, and make Switching Power Supply volume larger, it is of high cost.
Referring to Fig. 2, the existing method for solving the same topic of above-mentioned resistance R1 power consumptions is to be added in start-up circuit by MOS
The current source circuit that pipe Q2 and current-limiting resistance R3 are composed in series, input source voltage-drop loading is with power resistor R2 and voltage stabilizing two
The western end of regulator circuit that pole pipe ZD2 is composed in series, the cathode of zener diode ZD2 are connected to the grid of metal-oxide-semiconductor Q2, pass through
Regulator circuit stablizes the operating voltage of metal-oxide-semiconductor Q2, and the drain electrode of metal-oxide-semiconductor Q2 connects input source voltage by current-limiting resistance R3,
The source electrode of MOS pipes Q2 connects the output circuit being formed in parallel by output capacitance C2 and zener diode ZD3 as start-up circuit
Output terminal, Switching Power Supply normal work after, pass through the breaking circuit being made of triode Q1, resistance R4 and resistance R5
MOS pipes Q2 cut-offs are controlled, then disconnect power resistor R2.But it is operated in the situation of high input voltage in Switching Power Supply
Under, metal-oxide-semiconductor Q2 needs to bear high voltage, and is difficult to find that the device that can bear high pressure on the market, even if there is high pressure IGBT can
It selects, cost is very high, and there is risk out of stock using less.
Embodiment 1：
Therefore referring to Fig. 3, this programme is above-mentioned in order to solve the problems, such as, a kind of super wide voltage accessory power supply is devised
The start-up circuit of PWM chip, including voltage changeover switch circuit 1, voltage detecting circuit 2 and charging circuit 3；Voltage changeover switch
Circuit 1 is made of metal-oxide-semiconductor Q1, resistance R4 and resistance R5；Voltage detecting circuit 2 is made of metal-oxide-semiconductor Q2, resistance R7 and resistance R8；
Charging circuit 3 is made of resistance R1 and resistance R2；The drain electrode of metal-oxide-semiconductor Q1 is connected to one end of resistance R1 and resistance R2, resistance R1
It is another terminate to control source interface+Vin ends, the other end of resistance R2 is connected to the source electrode of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2
Source electrode, the grid of metal-oxide-semiconductor Q1 are connected with the drain electrode of metal-oxide-semiconductor Q2；On the grid of metal-oxide-semiconductor Q1 and the connecting line of the drain electrode of metal-oxide-semiconductor Q2
Resistance R4 is also connected with to be connected to control source interface+Vin ends and connect the source that resistance R5 is coupled with metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2
Pole；The other end of resistance R2 is also attached to the anode of capacitance C1 and the cathode of diode D1, the cathode series resistance R8 of capacitance C1
It is connected to the grid of metal-oxide-semiconductor Q2 and ground connection；The anode of diode D1 is grounded after being connected with auxiliary winding N1；The grid of metal-oxide-semiconductor Q2 is also
Series resistance R7 is connected to control source interface+Vin ends.
The Width funtion of control source interface+Vin ends input is direct current 200V-600V；Width funtion is divided into minimum input voltage
（300V）Vinmin, normal working voltage（400V）Vinnor, maximum input voltage（600V）Vinmax；
Wherein Vinmax=2Vinmin, Vinnor=（Vinmin+Vinmax）/2=3Vinmin/2=3/4Vinmax.
When input voltage is in Vinmin and Vinnor, resistance R7 and resistance R8 partial pressure after voltage value be less than metal-oxide-semiconductor Q2
Turning-on voltage, metal-oxide-semiconductor Q2 is off state；
Voltage value after resistance R4 and resistance R5 partial pressures is more than the turning-on voltage of metal-oxide-semiconductor Q2, and metal-oxide-semiconductor Q1 conductings, charge electricity
R2 short circuits are hindered, are control source Vin → resistance R1 → capacitance C1 to PWM chip VCC charge paths at this time, charging current is divided
For following several situations：
When input voltage is equal to Vinmin, charging current is minimum:Imin=Vinmin/R1=Vinmax/2R1；
When input voltage is equal to Vinnor, charging current is maximum:Imax=Vinnor/R1=400VDC/4MΩ=
100uA；
The maxima and minima ratio of charging current is：Imax:Imin=1:2；Charging circuit generate maximum loss be：
P1=Imax*Vinnor=100uA*400VDC=40mW；The voltage of metal-oxide-semiconductor Q1 should be 0V.
When input voltage is in Vinnor and Vinmax, resistance R7 and resistance R8 divider resistances partial pressure after voltage value it is big
In the turning-on voltage of metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q2 conductings, the grid and source short of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q1 are off, this
When be control source Vin → resistance R1 → capacitance C1 to PWM chip VCC charge paths；To PWM chip VCC charging currents
It is divided into following several situations：
When input voltage is equal to Vinnor, charging current is minimum:Imin=Vinnor/（R1+R2）=400VDC/8MΩ
=50uA；
When input voltage is equal to Vinmax, charging current is maximum:Imax=Vinmax/（R1+R2）=600VDC/8MΩ
=75uA；
The maxima and minima ratio of charging current is：Imax:Imin=1：1.25；The maximum loss that charging circuit generates
It is：P1=Imax*Vinmax=75uA*600VDC=45mW；The voltage of metal-oxide-semiconductor Q1 should be：VQ1=Vinmax*R2/（R1+R2）=1/
2Vinmax=300VDC。
It is Ivcc=Vin/ to PWM VCC charging currents（R1+R2）, as R1=R2, then charge stream=IVCC=Vin/2R1, this
When charging circuit generate maximum loss be：P1=Imax*Vinmax=75uA*600VDC=45mW, power consumption are also very low；This
When, the voltage of metal-oxide-semiconductor Q1 is：VQ1=Vinmax*R2/（R1+R2）=1/2Vinmax=300VDC.It can be seen that the voltage of Q1 and
Fig. 2 is compared, and is its half.
From above-mentioned discussion, input voltage changes to 600VDC from 200VDC, and the variation for the stream that charges is only 1:1.3, work(
Rate loss is also only 45mW.
Embodiment 2：
Referring to Fig. 4, series circuit schematic diagram is divided for two level, it is during applied to 100-1000VDC, then with the obvious advantage prominent
Go out；It is described as follows, when minimum input voltage is 100VDC, charging current is set to：50uA, then filling resistance is：R1=R2=
R3=100VDC/50uA=2M Ω, ibid analysis is the same, then during input voltage, charging current is only：I=Vinmax/（R1+R2+
R3）=1000VDC/6M Ω=166mA, curent change are only 1:3.Power attenuation is：P=I*Vinmax=166mW.MOS in Fig. 4
Pipe Q1, the voltage of metal-oxide-semiconductor Q3 should be：VQ1=VQ3=1/3Vinmax=330VDC。
Embodiment 3
Referring to Fig. 5, dividing series circuit schematic diagram for three-level, during applied to 100-2000VDC, then advantage is more prominent
Go out；It is described as follows, when minimum input voltage is 100VDC, charging current is set to：50uA, then filling resistance is：R1=R2=
R3=R41=100VDC/50uA=2M Ω, as above-mentioned analysis, then during input voltage, charging current is only：I=Vinmax/（R1
+R2+R3+R41）=1000VDC/8M Ω=125uA, curent change are only 1:2.5.Power attenuation is：P=I*Vinmax=250mW.
The voltage of Q1, Q3, Q5 in Fig. 5 should be：VQ1=VQ3=VQ5=1/4Vinmax=500VDC。
In summary：The present invention super wide voltage accessory power supply PWM chip start-up circuit, no matter input voltage what kind of
Variation, is stable to charging current to IC, relative variation is small；Input can be wide to 20 times or more；In same input electricity
In the case of pressure, Q1, Q2 only have a kind of working condition or open or turn off, so reliable operation；MOS in the present invention
The voltage of pipe Q1, metal-oxide-semiconductor Q2 compare metal-oxide-semiconductor Q11 in Fig. 3, Fig. 4, and the voltage of metal-oxide-semiconductor Q12 should be the half of its voltage；In height
In the case of control source, the loss of start-up circuit is very small, is more than 1/8 in Fig. 3, Fig. 4；In power failure,
Chip can restart, and will not enter locking state, after troubleshooting, can restart, power-off restarting is not required, special
It is not to depress work in extra-high voltage, circuit loss is compared much smaller with custom circuit.
While there has been shown and described that the embodiment of the utility model, for the ordinary skill in the art,
It is appreciated that in the case where not departing from the principle of the utility model and spirit can these embodiments be carried out with a variety of variations, repaiied
Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.
Claims (2)
1. a kind of start-up circuit of super wide voltage accessory power supply PWM chip, it is characterised in that：Including voltage changeover switch circuit
（1）, voltage detecting circuit（2）And charging circuit（3）；Voltage changeover switch circuit（1）By metal-oxide-semiconductor Q1, resistance R4 and resistance R5
Composition；Voltage detecting circuit（2）It is made of metal-oxide-semiconductor Q2, resistance R7 and resistance R8；Charging circuit（3）By resistance R1 and resistance R2
Composition；The drain electrode of metal-oxide-semiconductor Q1 is connected to one end of resistance R1 and resistance R2, resistance R1 it is another terminate to control source interface+
Vin ends, the other end of resistance R2 are connected to the source electrode of metal-oxide-semiconductor Q1 and the source electrode of metal-oxide-semiconductor Q2, the grid and metal-oxide-semiconductor of metal-oxide-semiconductor Q1
The drain electrode of Q2 is connected；The grid of metal-oxide-semiconductor Q1 is connected to control source with being also connected with resistance R4 on the connecting line of the drain electrode of metal-oxide-semiconductor Q2 and connects
Mouth+Vin ends and connection resistance R5 are coupled with the source electrode of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2；The other end of resistance R2 is also attached to
The anode of capacitance C1 and the cathode of diode D1, the cathode series resistance R8 of capacitance C1 are connected to grid and the ground connection of metal-oxide-semiconductor Q2；Two
The anode of pole pipe D1 is grounded after being connected with auxiliary winding N1；The grid of metal-oxide-semiconductor Q2 also series resistance R7 be connected to control source interface+
Vin ends.
2. a kind of start-up circuit of super wide voltage accessory power supply PWM chip according to claim 1, it is characterised in that：Institute
The Width funtion for stating the input of control source interface+Vin ends is 200V-600VDC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721272768.XU CN207459989U (en) | 2017-09-28 | 2017-09-28 | A kind of start-up circuit of super wide voltage accessory power supply PWM chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721272768.XU CN207459989U (en) | 2017-09-28 | 2017-09-28 | A kind of start-up circuit of super wide voltage accessory power supply PWM chip |
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| Publication Number | Publication Date |
|---|---|
| CN207459989U true CN207459989U (en) | 2018-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721272768.XU Withdrawn - After Issue CN207459989U (en) | 2017-09-28 | 2017-09-28 | A kind of start-up circuit of super wide voltage accessory power supply PWM chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508458A (en) * | 2017-09-28 | 2017-12-22 | 广州中逸光电子科技有限公司 | A kind of start-up circuit of super wide voltage accessory power supply PWM chip |
| CN111277128A (en) * | 2018-12-05 | 2020-06-12 | 联合汽车电子有限公司 | Flyback converter starting circuit and starting method based on high-voltage input |
-
2017
- 2017-09-28 CN CN201721272768.XU patent/CN207459989U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508458A (en) * | 2017-09-28 | 2017-12-22 | 广州中逸光电子科技有限公司 | A kind of start-up circuit of super wide voltage accessory power supply PWM chip |
| CN107508458B (en) * | 2017-09-28 | 2021-11-12 | 广州中逸光电子科技有限公司 | Starting circuit of PWM chip of ultra-wide voltage auxiliary power supply |
| CN111277128A (en) * | 2018-12-05 | 2020-06-12 | 联合汽车电子有限公司 | Flyback converter starting circuit and starting method based on high-voltage input |
| CN111277128B (en) * | 2018-12-05 | 2021-06-08 | 联合汽车电子有限公司 | Flyback converter starting circuit and starting method based on high-voltage input |
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