CN108347181A - A kind of power supply change-over device - Google Patents
A kind of power supply change-over device Download PDFInfo
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- CN108347181A CN108347181A CN201710061270.7A CN201710061270A CN108347181A CN 108347181 A CN108347181 A CN 108347181A CN 201710061270 A CN201710061270 A CN 201710061270A CN 108347181 A CN108347181 A CN 108347181A
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- 230000006978 adaptation Effects 0.000 claims abstract description 34
- 238000002955 isolation Methods 0.000 claims abstract description 16
- 230000005611 electricity Effects 0.000 claims abstract description 13
- 230000003321 amplification Effects 0.000 claims abstract description 11
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 11
- 238000005070 sampling Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 230000005669 field effect Effects 0.000 claims description 43
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000005513 bias potential Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
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- Dc-Dc Converters (AREA)
Abstract
A kind of adaptation power supply circuit directly takes electricity from high direct voltage of the alternating current after rectifier bridge, filter circuit rectifying and wave-filtering, generates stable DC low-voltage and powers for system, control circuit, which is characterized in that the adaptation power supply circuit includes：High_voltage isolation unit, high direct voltage caused by for city's electro-mechanical wave to be isolated fluctuate, and export the first stable DC voltage；Voltage-adjusting unit forms negative feedback control loop, the second DC voltage for the output of burning voltage adjustment unit with error amplifying unit, feedback sample unit；Feedback sample unit, the second DC voltage of proportional sampling voltage-adjusting unit output, exports feedback voltage；Reference voltage generates the stable reference voltage of unit output；And reference voltage is generated the reference voltage that unit exports and the feedback voltage that feedback sample unit exports and carries out error amplification by error amplifying unit, generates error amplification signal so that the second DC voltage of voltage-adjusting unit output is proportional to reference voltage.
Description
Technical field
The present invention relates to technical field of integrated circuits more particularly to a kind of power supply converting means being directly connected with alternating current
It sets.
Background technology
Power semiconductor technologies are fast-developing, power supply change-over device, the power supply conversion being especially connected directly with alternating current
Device rapid proliferation.Power supply change-over device supplies after the power of alternating current is directly converted to constant voltage or constant electric current
Constant pressure loads, or similar to the Constant Current Load of LED.
With reference to figure 1, existing power supply conversion equipment configuration diagram.Power supply circuit 13, non-essential resistance 14 and external capacitive 15
It cooperates, alternating current 10 is directly passed through into 11 rectification of rectifier bridge, 12 filtered high direct voltage Vdc of filter circuit is converted into direct current
Low pressure Vcc powers to system, control circuit 16, and system, control circuit 16 is that load 17 provides the voltage of constant pressure or constant electricity
Stream.Sampled signal Vfb is exported after Vcc voltage signal on 131 sampling capacitor 15 of feedback sample unit, reference voltage generates unit
The reference voltage signal Vref of 132 outputs, power supply circuit 13 pass to sampled signal Vfb and reference voltage signal Vref together
Error amplifying unit 133, error amplifying unit 133 amplifies the error of voltage signal Vfb and Vref, for controlling metal-oxide-semiconductor 134
Grid end, the drain terminal of metal-oxide-semiconductor 134 connect with the common end of resistance 14 and capacitance 15, and feedback sample unit 131, error amplification are single
Member 133 and metal-oxide-semiconductor 134 form feedback loop together, and dynamic adjusts the voltage on capacitance 15 so that Vcc voltage is to system control
16 stable power-supplying of circuit processed.
Assuming that it is Vcc, supply current I0 that system, control circuit 16, which works normally required supply voltage,.In order to maintain
The maximum occurrences of stable Vcc voltage, resistance R0 are (Vdc-Vcc)/R0, since the variation range of alternating current 10 is very wide, usually
It is fluctuated in 85Vac~265Vac, in order to realize the stabilization to system, control circuit 16 in entire alternating current fluctuation range
Power supply, existing power supply change-over device must assure that alternating current 10 is able to maintain that the steady of Vcc voltage in minimum voltage 85Vac
It is fixed.Necessarily cause alternating current 10 in maximum value 265Vac in this way, feedback loop has to extra electric current passing through metal-oxide-semiconductor
134 are released to GND, result in the increase of reduction, energy dissipation and the calorific value of power supply efficiency.
Simultaneously in order to maintain the low pressure of Vcc voltage to stablize, existing power supply circuit is had to through discrete device electricity
Hinder R0 Come isolation high pressures Vdc；But when 16 moment of system, control circuit extracts larger current, resistance R0 can not provide enough energy
Amount, causes existing power supply circuit to have to larger discrete device storage capacitor 15 to maintain 16 moment of system, control circuit to be taken out
The electric current taken, discrete device storage capacitor also result in the increase of cost.
Invention content
It is an object of the present invention to for poor efficiency, high heat, Gao Cheng caused by existing power supply conversion equipment power supply circuit
This, it is proposed that a kind of power supply change-over device using adaptation power supply circuit, by the way that the influence of mains fluctuation is isolated, to carry
High power supply efficiency；By reducing or removing discrete device storage capacitor, to reduce cost.
To achieve the above object, the present invention proposes a kind of adaptation power supply circuit, directly from alternating current by rectifier bridge, filter
The later high direct voltage of wave circuit rectifying and wave-filtering takes electricity, generates stable DC low-voltage and powers for system, control circuit, it is preferable that
The adaptation power supply circuit includes：
High_voltage isolation unit, high direct voltage caused by for city's electro-mechanical wave to be isolated fluctuate, and export the first stable direct current
Pressure；
Voltage-adjusting unit forms negative feedback control loop, for stablizing electricity with error amplifying unit, feedback sample unit
Press the second DC voltage of adjustment unit output；
Second DC voltage of feedback sample unit proportional sampling voltage-adjusting unit output, exports feedback voltage；
Reference voltage generates the stable reference voltage of unit output；
Reference voltage is generated the feedback of the reference voltage and the output of feedback sample unit of unit output by error amplifying unit
Voltage carries out error amplification, generates error amplification signal so that the second DC voltage of voltage-adjusting unit output and reference electricity
It is pressed into ratio.
Preferably, the high_voltage isolation unit is JFET or depletion field effect transistor, the JFET or depletion type field
The first end of effect pipe is electrically connected zero potential or fixed voltage bias potential, straight after second end electric connection filter circuit
High pressure is flowed, third end is electrically connected with voltage-adjusting unit.
Preferably, the voltage-adjusting unit includes the first field-effect tube, the first field-effect tube drain terminal and high_voltage isolation list
Member is electrically connected, and grid end and the error amplifying unit of the first field-effect tube are electrically connected, the source and voltage of the first field-effect tube
Second DC voltage of adjustment unit output is electrically connected.
Preferably, the first field-effect tube in the adaptation power supply circuit is replaced by npn type triode.
Preferably, the gain of the feedback sample unit is determined by the ratio of two resistance.
Preferably, the error amplifying unit generates unit and is electrically connected with feedback sample unit, reference voltage, produced
Error amplification signal and voltage-adjusting unit be electrically connected.
Preferably, the error amplifying unit includes the first error amplifier, first resistor and the second field-effect tube, error
The in-phase input end of amplifier and the feedback voltage of feedback sample unit output are electrically connected, the inverting input of error amplifier
The reference voltage that unit output is generated with reference voltage is electrically connected, the grid end of error amplifier output and the second field-effect tube
It being electrically connected, source and the ground of the second field-effect tube are electrically connected, and drain terminal and the first resistor of the second field-effect tube are electrically connected,
The other end of first resistor is electrically connected with the common end of voltage-adjusting unit and high_voltage isolation unit, first resistor and second
The common end of effect pipe is electrically connected with voltage-adjusting unit.
Preferably, the adaptation power supply circuit further includes negative-feedback compensating unit, for maintaining feedback loop to stablize
Work.
Preferably, the drain terminal of negative-feedback compensating unit one end and the second field-effect tube is electrically connected, the other end and the
The grid end of two field-effect tube is electrically connected, and the negative-feedback compensating unit includes at least compensating electric capacity.
Preferably, the adaptation power supply circuit further includes power on reset unit, and power on reset unit and voltage adjustment are single
Second DC voltage of member output is electrically connected, and after the second DC voltage reaches preset value, power on reset unit output powers on
Reset signal, the signal are electrically connected with error amplifying unit.
Preferably, the adaptation power supply circuit further includes storage capacitor, and described storage capacitor one end is straight with described second
Galvanic electricity piezoelectricity connects, and the other end is electrically connected with ground.
Preferably, the storage capacitor is integrated into chip interior, or is placed in chip exterior.
A kind of power supply change-over device, including above-mentioned adaptation power supply circuit further include rectifier bridge, filter circuit and are
System control
Circuit processed.
The advantage of the invention is that：Caused by city's electro-mechanical wave being avoided using the power supply change-over device of adaptation power supply circuit
Power supply efficiency reduces, and reduces calorific value, while the storage capacitor of existing power supply circuit and isolation high-tension resistive are integrated into core
Inside piece, cost is reduced.
Description of the drawings
Fig. 1, existing power supply conversion equipment configuration diagram；
Fig. 2, power supply change-over device configuration diagram of the present invention；
Fig. 3, the schematic diagram of adaptation power supply circuit first embodiment of the present invention；
Fig. 4, the schematic diagram of adaptation power supply circuit second embodiment of the present invention.
Specific implementation mode
It elaborates below in conjunction with the accompanying drawings to adaptation power supply circuit provided by the invention and power supply change-over device.
It is power supply change-over device configuration diagram of the present invention with reference to figure 2.
The power supply change-over device includes：The rectifier bridge 21 and rectifier bridge 21 being electrically connected with AC power 20 are electrical
The filter circuit 22 of connection and with the filter circuit 22 be electrically connected system, control circuit 24 and with system control electricity
The load 25 that road is electrically connected；The power supply change-over device further includes adaptation power supply circuit 23.
The AC power 20 is alternating current, and input terminal and the AC power 20 of the rectifier bridge 21 are electrically connected, and being used for will
The AC rectification that AC power 20 exports is direct current.Rectifier bridge 21 is the full-bridge rectifier formed using four diodes.
The output of rectifier bridge 21 terminates filter circuit 22, is filtered to high direct voltage Vdc, adaptation power supply circuit 23 and the direct current
High pressure is electrically connected, and stable direct current supply voltage vcc is provided to system, control circuit 24, and control system circuit 24 will be described straight
Stream high pressure Vdc is converted into the constant voltage needed for load 25 or constant current.
The adaptation power supply circuit 23 includes：High_voltage isolation unit 235, voltage-adjusting unit 234, error amplifying unit
233, feedback sample unit 231 and reference voltage generate unit 232.
Described 235 one end of high_voltage isolation unit is electrically connected alternating current 20 and passes through rectifier bridge 21 and 22 rectifying and wave-filtering of filter circuit
Later high direct voltage Vdc, the other end are electrically connected voltage-adjusting unit 234, and the fluctuation of alternating current 20 will cause high direct voltage Vdc waves
Dynamic, the high_voltage isolation unit 235 has been isolated high direct voltage Vdc and has fluctuated influence to voltage-adjusting unit 234, the high pressure every
The first stable DC voltage Vn is exported from unit 235；
The voltage-adjusting unit 234 is electrically connected with error amplifying unit 233, feedback sample unit 231, and and error
Amplifying unit 233, feedback sample unit 231 form negative feedback control loop, are exported for burning voltage adjustment unit 234 to being
The second DC voltage Vcc that control circuit 24 of uniting is powered；
The feedback sample unit 231 is electrically connected with voltage-adjusting unit 234, proportional sampling voltage-adjusting unit 234
Second DC voltage Vcc of output, and export feedback voltage Vfb；
The reference voltage generates unit 232 and exports stable reference voltage Vref.
Error amplifying unit 233 generates unit 232 and is electrically connected, and will refer to feedback sample unit 231, reference voltage
The reference voltage Vref that voltage generating unit 232 exports carries out error with the feedback voltage Vfb that feedback sample unit 231 exports and puts
Greatly, while output error amplified signal Veao is electrically connected with voltage-adjusting unit 234 so that voltage-adjusting unit 234 exports
The second DC voltage Vcc is proportional to reference voltage Vref and Vcc=k*Vref.
It is two embodiment schematic diagrams of adaptation power supply circuit of the present invention with reference to figure 3 and Fig. 4.
In one embodiment, the high_voltage isolation unit 235 is JFET or depletion field effect transistor, the JFET or
It is that the first end of depletion field effect transistor is electrically connected zero potential or fixed voltage bias potential, such as Vn or Vcc, second
End is electrically connected the high direct voltage Vdc after filter circuit 22, and third end is electrically connected with voltage-adjusting unit 234.JFET or
Depletion field effect transistor is all normally on device, does not need external signal control, remains in conducting state.By taking JFET as an example
The pinch-off voltage Vn of son, JFET is fixed voltage, as long as the voltage of JFET drain terminals Vdc is higher than its intrinsic pinch-off voltage Vn,
No matter what JFET drain terminal voltages Vdc fluctuate within the scope of, the source of JFET can export stable voltage Vn.When JFET's
When control termination zero potential, the source voltage terminal of JFET will be close to its pinch-off voltage Vn；As the fixed current potential Vcc of control termination of JFET
When, the source voltage terminal of JFET will be close to Vn+Vcc.Due to the influence that Vn voltages are not fluctuated with alternating current 20, so with very high
Power supply efficiency.
In one embodiment, the voltage-adjusting unit 234 includes the first field-effect tube M2, the first field-effect tube M2 leakages
End is electrically connected with high_voltage isolation unit 235, and grid end and the error amplifying unit 233 of the first field-effect tube M2 are electrically connected, the
The second DC voltage Vcc that the source of one field-effect tube M2 is exported with voltage-adjusting unit 234 is electrically connected.First field-effect tube
M2 is equivalent to source level follower.
In other embodiments, the first field-effect tube M2 in the voltage-adjusting unit 234 is by npn type triode generation
It replaces.
The gain K of the feedback sample unit 231 is determined by the ratio of two divider resistance (not shown)s, is equivalent to Vcc
=k*Vfb wherein K are constant.
The error amplifying unit 233 includes the first error amplifier EA1, first resistor R1 and the second field-effect tube M3,
The in-phase input end of error amplifier EA1 is electrically connected with the feedback voltage Vfb that feedback sample unit 231 exports, error amplification
The inverting input of device EA1 generates the reference voltage Vref that unit 232 exports with reference voltage and is electrically connected, error amplifier
The grid end of EA1 output ends and the second field-effect tube M3 are electrically connected, and source and the ground of the second field-effect tube M3 are electrically connected, and second
The drain terminal of field-effect tube M3 is electrically connected with first resistor R1, the other end and high_voltage isolation unit 235 and the electricity of first resistor R1
The common end of adjustment unit 234 is pressed to be electrically connected, the common end of first resistor R1 and the second field-effect tube M3 and voltage adjustment are single
Member 234 is electrically connected, and error amplifying unit 233 forms negative feedback control with feedback sample unit 231, voltage-adjusting unit 234
Loop, the second DC voltage Vcc exported for burning voltage adjustment unit 234.
In one embodiment, the error amplifying unit 233 further includes negative-feedback compensating unit 41, for remaining negative anti-
Loop stability work is presented, described 41 one end of negative-feedback compensating unit and the drain terminal of the second field-effect tube M3 are electrically connected, the other end
It is electrically connected with the grid end of the second field-effect tube M3.
In one embodiment, the negative-feedback compensating unit 41 includes at least compensating electric capacity Cc, or further includes compensation electricity
Hinder Rc.
In one embodiment, the adaptation power supply circuit 23 further includes power on reset unit 42, power on reset unit
42 the second DC voltage Vcc exported with voltage-adjusting unit 234 are electrically connected, when the second DC voltage Vcc has reached default
After value, power on reset unit 42 exports power-on reset signal Pokb, which is electrically connected with error amplifying unit 233.Work as Vcc
Do not reach preset value, the power-on reset signal Pokb that power on reset unit 42 exports is high level, the power-on reset signal
The drop-down of the grid step voltage of the second field-effect tube M3 in error amplifying unit is low level by Pokb, at this time M3 will not galvanic electricity stream,
Also no electric current flows through resistance R1, so the grid of field-effect tube M2 will be essentially pulled up to high direct voltage Vn, M2 together with its drain terminal
Diode connection type is formd, M2 would operate in saturation region and provide electric current to Vcc, after Vcc voltage rises to preset value,
42 output signal Pokb of power on reset unit becomes low level, meanwhile, by voltage-adjusting unit 234 and error amplifying unit 233,
The feedback loop that feedback sample unit 231 is formed also is established synchronous, and Vcc voltage is stabilized.
Setting M2 allows M2 with stronger current driving ability, the grid of feedback loop adjustment M2 with larger size
Voltage so that M2 is always in saturated.When system, control circuit 24 needs smaller electric current, feedback loop will be protected
M2 is held with smaller Vgs voltages to maintain Vcc voltage to stablize；It is led when system, control circuit 24 quickly extracts a larger current
When Vcc voltage being caused to reduce, since the bandwidth of feedback loop is smaller, the grid voltage of M2 almost has little time to change, Vcc voltage drop
It is low, cause the source voltage of M2 to reduce, so the Vgs voltages of M2 will be automatically increased, the electric current confession increased to Vcc voltage should be able to
Power reduces the fluctuation of Vcc voltage.Since M2 has the ability of adaptive adjustment output current, so even if Vcc voltage is not defeated
Go out capacitance, Vcc, which is also ensured that, has smaller voltage ripple.
In one embodiment, in order to further decrease the voltage ripple of Vcc, the adaptation power supply circuit 24 also increases
Storage capacitor 43,43 one end of the storage capacitor are electrically connected with the second DC voltage Vcc, and the other end electrically connects with ground
It connects.
Due to the adaptive characteristic that power supply circuit has, the storage capacitor 43 can be selected flexibly very much, Ke Yiji
At to chip interior, or it is placed in chip exterior.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (14)
1. a kind of adaptation power supply circuit, the directly high direct voltage from alternating current after rectifier bridge, filter circuit rectifying and wave-filtering
Electricity is taken, stable DC low-voltage is generated and powers for system, control circuit, which is characterized in that the adaptation power supply circuit includes：
High_voltage isolation unit, high direct voltage caused by for city's electro-mechanical wave to be isolated fluctuate, and export the first stable DC voltage；
Voltage-adjusting unit forms negative feedback control loop with error amplifying unit, feedback sample unit, is used for burning voltage tune
Second DC voltage of whole unit output；
Feedback sample unit, the second DC voltage of proportional sampling voltage-adjusting unit output, exports feedback voltage；
Reference voltage generates unit, exports stable reference voltage；And
Reference voltage is generated the feedback voltage of the reference voltage and the output of feedback sample unit of unit output by error amplifying unit
Carry out error amplification, generate error amplification signal so that the second DC voltage and the reference voltage of voltage-adjusting unit output at
Ratio.
2. adaptation power supply circuit according to claim 1, which is characterized in that the high_voltage isolation unit be JFET or
The first end of depletion field effect transistor, the JFET depletion field effect transistors is electrically connected zero potential or fixed voltage is inclined
Current potential is set, second end is electrically connected the high direct voltage after filter circuit, and third end is electrically connected with voltage-adjusting unit.
3. adaptation power supply circuit according to claim 1, which is characterized in that the voltage-adjusting unit includes first
Effect pipe, the first field-effect tube drain terminal are electrically connected with high_voltage isolation unit, and the grid end of the first field-effect tube and error amplification are single
Member is electrically connected, and the source and the second DC voltage of voltage-adjusting unit output of the first field-effect tube are electrically connected.
4. adaptation power supply circuit according to claim 3, which is characterized in that the first field-effect tube is by npn type triode
Instead of.
5. adaptation power supply circuit according to claim 1, which is characterized in that the gain of the feedback sample unit is by two
The ratio of a resistance determines.
6. adaptation power supply circuit according to claim 1, which is characterized in that the error amplifying unit and feedback sample
Unit, reference voltage generate unit and are electrically connected, and generated error amplification signal is electrically connected with voltage-adjusting unit.
7. adaptation power supply circuit according to claim 6, which is characterized in that the error amplifying unit includes the first mistake
Poor amplifier, first resistor and the second field-effect tube, in-phase input end and the feedback sample unit of error amplifier export anti-
Feedthrough voltage is electrically connected, and the inverting input and reference voltage of error amplifier generate the reference voltage that unit exports and electrically connect
It connects, the grid end of error amplifier output and the second field-effect tube is electrically connected, and source and the ground of the second field-effect tube electrically connect
It connects, drain terminal and the first resistor of the second field-effect tube are electrically connected, the other end and voltage-adjusting unit and the high pressure of first resistor
The common end of isolated location is electrically connected, and the common end of first resistor and the second field-effect tube electrically connects with voltage-adjusting unit
It connects.
8. adaptation power supply circuit according to claim 7, which is characterized in that further include negative-feedback compensating unit, be used for
Maintain feedback loop steady operation.
9. adaptation power supply circuit according to claim 8, which is characterized in that negative-feedback compensating unit one end and the
The drain terminal of two field-effect tube is electrically connected, and the grid end of the other end and the second field-effect tube is electrically connected, and the negative-feedback compensation is single
Member includes at least compensating electric capacity.
10. adaptation power supply circuit according to claim 1, which is characterized in that further include power on reset unit, above reply by cable
Bit location and the second DC voltage of voltage-adjusting unit output are electrically connected, after the second DC voltage has reached preset value,
Power on reset unit exports power-on reset signal, which is electrically connected with error amplifying unit.
11. adaptation power supply circuit according to claim 1, which is characterized in that further include storage capacitor, the energy storage electricity
Hold one end to be electrically connected with second DC voltage, the other end is electrically connected with ground.
12. adaptation power supply circuit according to claim 11, which is characterized in that the storage capacitor is integrated into chip
Portion, or it is placed in chip exterior.
13. the adaptation power supply circuit described in any one of a kind of power supply change-over device, including claim 1 to 12.
14. power supply change-over device according to claim 13, which is characterized in that further include rectifier bridge, filter circuit and
System, control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710061270.7A CN108347181B (en) | 2017-01-25 | 2017-01-25 | Power supply conversion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710061270.7A CN108347181B (en) | 2017-01-25 | 2017-01-25 | Power supply conversion device |
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| Publication Number | Publication Date |
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| CN108347181A true CN108347181A (en) | 2018-07-31 |
| CN108347181B CN108347181B (en) | 2020-02-07 |
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|---|---|---|---|
| CN201710061270.7A Active CN108347181B (en) | 2017-01-25 | 2017-01-25 | Power supply conversion device |
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| CN104410303A (en) * | 2014-11-27 | 2015-03-11 | 成都芯源系统有限公司 | High-voltage current source and providing method thereof |
| CN105375798A (en) * | 2015-11-25 | 2016-03-02 | 上海晶丰明源半导体有限公司 | Self-adaptive sampling circuit, primary side feedback constant voltage system and switching power supply system |
| CN106329959A (en) * | 2015-06-30 | 2017-01-11 | 华润矽威科技（上海）有限公司 | High-voltage self-powered circuit |
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2017
- 2017-01-25 CN CN201710061270.7A patent/CN108347181B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0650111A2 (en) * | 1993-10-25 | 1995-04-26 | Motorola, Inc. | Off-line bootstrap startup circuit |
| TW201025818A (en) * | 2008-12-26 | 2010-07-01 | Richtek Technology Corp | Power transistor chip with built-in junction field effect transistor and application circuit thereof |
| CN101872227A (en) * | 2009-04-21 | 2010-10-27 | 鸿富锦精密工业（深圳）有限公司 | Power supply circuit |
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| CN104319997A (en) * | 2014-11-17 | 2015-01-28 | 苏州朗宽电子技术有限公司 | High voltage and low voltage conversion circuit for micro-power and low-cost application of input voltage in wide range |
| CN104410303A (en) * | 2014-11-27 | 2015-03-11 | 成都芯源系统有限公司 | High-voltage current source and providing method thereof |
| CN106329959A (en) * | 2015-06-30 | 2017-01-11 | 华润矽威科技（上海）有限公司 | High-voltage self-powered circuit |
| CN105375798A (en) * | 2015-11-25 | 2016-03-02 | 上海晶丰明源半导体有限公司 | Self-adaptive sampling circuit, primary side feedback constant voltage system and switching power supply system |
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|---|---|
| CN108347181B (en) | 2020-02-07 |
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