CN110011527A - A kind of Switching Power Supply start-up circuit - Google Patents
A kind of Switching Power Supply start-up circuit Download PDFInfo
- Publication number
- CN110011527A CN110011527A CN201811450276.4A CN201811450276A CN110011527A CN 110011527 A CN110011527 A CN 110011527A CN 201811450276 A CN201811450276 A CN 201811450276A CN 110011527 A CN110011527 A CN 110011527A
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- Prior art keywords
- power supply
- circuit
- resistance
- triode
- voltage
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
Abstract
The invention discloses a kind of start-up circuit of Switching Power Supply, including input terminal and output end VCC, the anode of output end, output end VCC connection power supply chip U1 after input terminal connection commercial power rectification filtering；It further include a bleeder circuit, diode D3, triode Q2 and the zener diode Z1 for connecting the input terminal；The base stage of triode Q2 accesses the tie point between a bleeder circuit and the input terminal by resistance R3, and the collector of triode Q2 connects one end of the tie point and the resistance R3, and the emitter of triode Q2 passes through diode D3 connection output end VCC；The cathode of the zener diode Z1 is connect by resistance R5 with the cathode of the diode D3, output end VCC；The anode of zener diode Z1 and the ground of power supply chip U1 and commercial power rectification are connect filteredly.The start-up circuit of Switching Power Supply of the present invention is reasonably connected by each component, effectively improves the efficiency of Switching Power Supply on startup.
Description
Technical field
The present invention relates to field of switch power, specially a kind of start-up circuit of Switching Power Supply.
Background technique
Switching Power Supply is various DC voltages required for alternating current to be converted into us, exportable multichannel different voltages function
The direct current of rate is widely used in the various places for needing low-voltage DC and circuit application.Present many Switching Power Supplies
Start-up circuit there is a problem of not starting or excessively complicated, bring many fiber crops for the stability and practicability of Switching Power Supply
It is tired.
Existing switch chip power supply as shown in Figure 1, its working principle is that: U2 is that a low standby power loss is opened offline
The self-supporting current type monolithic converter in powered-down source, it integrates the MOSFET of fixed frequency current mode pwm controller and 700V
On one chip, there is soft start, frequency jitter, short circuit current protection, hop cycle, peak inrush current adjustment and dynamic certainly
Function of supplying power.Chip U2, U3, diode D3, D4, voltage-stabiliser tube Z5, resistance R5, inductance L1, capacitor C4, C5, C6 composition switch electricity
The power supply circuit in source.Wherein the circuit of U2, D3, D4, R5, L1, C5, C6 composition is classical buck reduction voltage circuit, U3, Z1, C4
Voltage feedback circuit is formed, the DC voltage that the DC voltage of 310VDC is reduced to about 16VDC after commercial power rectification is filtered supplies
Chip U1 work.The start-up circuit of Fig. 1 Switching Power Supply uses buck reduction voltage circuit, and the frequency of switching tube work is higher, it is easy to
Bring the electromagnetic interference problem of new frequency band into.
Summary of the invention
A kind of a kind of the present invention provides structures Switching Power Supply start-up circuit simple, at low cost.
A kind of start-up circuit of Switching Power Supply, including input terminal and output end VCC, input terminal connection commercial power rectification filter
The anode of output end after wave, output end VCC connection power supply chip U1；Further include a bleeder circuit for connecting the input terminal,
Diode D3, triode Q2 and zener diode Z1；The base stage of triode Q2 accesses a bleeder circuit by resistance R3
With the tie point between the input terminal, the collector of triode Q2 connects one end of the tie point and the resistance R3, and three
The emitter of pole pipe Q2 passes through diode D3 connection output end VCC；The cathode of the zener diode Z1 passes through resistance R5 and institute
State cathode, the output end VCC connection of diode D3；The anode of zener diode Z1 and the ground of power supply chip U1 and commercial power rectification are filtered
Ground connection after wave.
Preferably, a bleeder circuit includes resistance R1, R2, zener diode Z2 and electrolytic capacitor E2；It is described
Input terminal, the cathode of resistance R2 and zener diode Z2 and the positive phase of electrolytic capacitor E2 are accessed after resistance R1 and resistance R2 series connection
The anode of connection, the cathode of electrolytic capacitor E2 and zener diode Z2, the ground of power supply chip U1 and commercial power rectification are filtered
It is connected；The tie point is located between resistance R1 and R2.
Preferably, the triode Q1 is NPN type universal transistor, and Q2 is NPN type low-power high-voltage high-speed switch crystal
Pipe.
Preferably, described voltage-stabiliser tube Z1, Z2 are the voltage-stabiliser tube of 12V；Power supply chip U1 model uses KA3525.
It further includes breaking circuit that the present invention also provides a kind of Switching Power Supplies including above-mentioned start-up circuit, the starting
Circuit includes input terminal and output end VCC, the anode of output end, output end VCC after input terminal connection commercial power rectification filtering
Connect power supply chip U1；It further include a bleeder circuit for connecting the input terminal, two pole diode D3, triode Q2 and pressure stabilizing
Pipe Z1；The base stage of triode Q2 accesses the tie point between a bleeder circuit and the input terminal by resistance R3, and three
The collector of pole pipe Q2 connects one end of the tie point and the resistance R3, and the emitter of triode Q2 is connected by diode D3
Meet output end VCC；The cathode of the zener diode Z1 is connected by cathode, the output end VCC of the resistance R5 and diode D3
It connects；The anode of zener diode Z1 and the ground of power supply chip U1 and commercial power rectification are connect filteredly；
The breaking circuit includes that triode Q1 and capacitor C1, the power supply chip U1 pass through the base stage of resistance R4 and triode Q1
It is connected with one end of capacitor C1, the collector of triode Q1 is connect with the base stage of resistance R3 and triode Q2, the hair of triode Q1
Emitter-base bandgap grading is connected with the other end of the anode of zener diode Z1, capacitor C1 and also filters with the ground of power supply chip U1 and commercial power rectification
Ground after wave is connected；The power supply chip U1 is used for after start-up circuit starting, and one burning voltage of output passes through the resistance R4
Triode Q1 is connected, triode Q2 cut-off, start-up circuit shutdown.
Preferably, a bleeder circuit includes resistance R1, R2, zener diode Z2 and electrolytic capacitor E2；It is described
Input terminal, the cathode of resistance R2 and zener diode Z2 and the positive phase of electrolytic capacitor E2 are accessed after resistance R1 and resistance R2 series connection
The anode of connection, the cathode of electrolytic capacitor E2 and zener diode Z2, the ground of power supply chip U1 and commercial power rectification are filtered
It is connected；The tie point is located between resistance R1 and R2.
Preferably, the triode Q1 is NPN type universal transistor, and Q2 is NPN type low-power high-voltage high-speed switch crystal
Pipe.
Preferably, described voltage-stabiliser tube Z1, Z2 are the voltage-stabiliser tube of 12V；Power supply chip U1 model uses KA3525.
The technical solution adopted by the present invention are as follows: the start-up circuit and shutdown power supply circuit of a kind of Switching Power Supply are provided；Starting
Electric routing resistance R1, R2, R3, R5, capacitor E2, high voltage transistor Q2, general-purpose diode D3, voltage-stabiliser tube Z1, Z2 composition are complete
The start-up circuit of Switching Power Supply.Breaking circuit includes resistance R4, capacitor C1, normal transistor Q1, power supply chip U1 composition.
The base stage of transistor Q2 is connected with one end of the collector of transistor Q1 and resistance R3, the collector of transistor Q2 and
The other end of resistance R3 is connected with one end of resistance R1, R2, and the emitter of transistor Q2 is connected with the anode of diode D3；Two poles
The cathode of pipe D3 is connected with one end of the power pin of power supply chip and resistance R5 and the cathode of diode D2 and electrolytic capacitor E3
Anode be connected；The other end of resistance R5 is connected with the cathode of voltage-stabiliser tube Z1；The anode of voltage-stabiliser tube Z1 and the ground of power supply chip U1
With commercial power rectification it is filtered be connected；The other end of resistance R1 is connected with the filtered anode in commercial power rectification, and resistance R2's is another
One end is connected with the anode of the cathode of voltage-stabiliser tube Z2 and electrolytic capacitor E2；The cathode of the anode of voltage-stabiliser tube Z2 and electrolytic capacitor E2 and
The ground of power supply chip and commercial power rectification are connected filteredly.
The base stage of transistor Q1 is connected with one end of resistance R4 with one end of capacitor C1, the collector and crystal of transistor Q1
The base stage of pipe Q2 is connected with one end of resistance R3, the other end of the emitter of transistor Q1 and the anode of voltage-stabiliser tube Z1 and capacitor C1
Be connected and with the ground of power supply chip and commercial power rectification it is filtered be connected；The other end of resistance R4 and the benchmark of power supply chip U1
Voltage foot is connected.
Working principle: after city is electrically accessed, rectifying through full bridge rectifier bridge, after electrolytic capacitor filtering, obtains about 310VDC's
DC voltage.Resistance R1, R2, voltage-stabiliser tube Z2, electrolytic capacitor E2 divide the direct current after rectifying and wave-filtering, and c point is because steady
The voltage of c electricity is 12VDC after pressure pipe Z2 pressure stabilizing, and the voltage of a point is according to formula after partial pressureIt calculates
About 210VDC；Triode Q1 is in off state at this time, and Q2 is in the conductive state, resistance R3, R5, triode Q2, diode
D3, voltage-stabiliser tube Z1 form bleeder circuit all the way, and for d point because the voltage of d point is 12VDC after voltage-stabiliser tube Z1 pressure stabilizing, diode D3 is anti-
Only electric current reverse-conducting, then the voltage of b point is about 24VDC after partial pressure, triode Q2, diode D3 are in the conductive state, VCC
The voltage of point is about 23VDC, chip U1 starting, i.e., exportable PWM wave, driving metal-oxide-semiconductor work.(voltage difference of a point and d point is about
For 198VDC, triode Q2, diode D3 are in the conductive state, ignore the pressure difference of triode Q2, diode D3, resistance R3 and R5
It is divided, the voltage that VCC point is calculated is 23VDC, considers the tube voltage drop of triode Q2, diode D3, the voltage of b point is about
For 24VDC).
The start-up circuit of Switching Power Supply completes its starting work, while power supply chip U1 is worked normally, the electricity of VCC point
Pressure stablizes the voltage value in setting, shape through metal-oxide-semiconductor work by transformer auxiliary winding after diode D2 rectification, E3 filtering
At stable closed loop；Power supply chip can export the voltage of a stable 5VDC simultaneously, pass through resistance R4 triode Q1 at this time
Conducting, b point voltage pull-down to 0V, triode Q2 cut-off, start-up circuit shutdown.
In specific implementation process, through commercial power rectification filtered alternating voltage at least 250VDC, resistance R1, R2 are divided
Pressure, voltage-stabiliser tube Z2 play the role of pressure stabilizing and protection, guarantee that the voltage of a point is not less than 12VDC, voltage-stabiliser tube Z1 primarily serves protection
The effect of power supply chip voltage, when guaranteeing the work of Switching Power Supply start-up circuit, the voltage of power supply chip is not too high or mistake
It is low to cause power supply chip starting unsuccessful.In order to keep VCC point voltage not excessively high and too low and successfully start up power supply chip,
Voltage-stabiliser tube in start-up circuit requires 12V voltage-stabiliser tube, and power supply chip is that similar 3525 chips have reference voltage output, electricity
Resistance, diode are conventional.
Q1 is NPN type universal transistor, and Q2 is NPN type low-power high-voltage high-speed switch silicon transistor.
The invention has the benefit that the start-up circuit of the Switching Power Supply is reasonably connected by each component, effectively
Ground improves the efficiency of Switching Power Supply on startup；And by electric resistance partial pressure, transistor realizes circuit, reduce circuit at
This；Meanwhile voltage-stabiliser tube Z1, Z2 play partial pressure and protective effect well.
Furthermore the present invention is also equipped with following advantage:
Circuit is simple, and original circuit needs to use special chip, also needs inductance, fast recovery diode composition reduction voltage circuit, also
The voltage value that feed circuit stablizes reduced output voltage is needed, improved start-up circuit is made of resistance and a triode, former
Reason is simple, and required precision is not high, and matching is convenient.
Start-up circuit is safe and reliable, and original circuit needs the chip power supply circuit in addition plus assisted, has switch in circuit
Pipe, improper use be easy to cause the damage of pipe, make entire circuit cisco unity malfunction, and improved start-up circuit uses resistance
Partial pressure and triode ON, high stability.
Cost is relatively low, in addition conventional startup circuit connects BUCK reduction voltage circuit all the way, and reduction voltage circuit is steady using specific chip
Pressure, the cost is relatively high, resistance, triode composition of this patent using low cost, advantage of lower cost.
The preferred embodiment of the invention are as follows: provide safe and reliable starting for the portable power supply device of some electric tools
Circuit, start-up circuit is simple, reduces the volume of power supply unit.
The present invention is suitable for the start-up circuit of various switching power source chip circuits.
Detailed description of the invention
Fig. 1 is the correlation circuit diagram of existing Switching Power Supply.
Fig. 2 is the circuit diagram of the Switching Power Supply of the embodiment of the present invention.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings:
After the circuit diagram of the Switching Power Supply of the embodiment of the present invention is as shown in Fig. 2, Switching Power Supply connects alternating current, by full bridge rectifier bridge D1
After rectification, electrolytic capacitor E1 filtering, the DC voltage after output rectification filter.The DC voltage gives power supply core by start-up circuit
Piece U1 power supply, startup power supply chip U1 start to start work, then power supply chip U1 output pwm signal, and then control metal-oxide-semiconductor work
Make；Power supply chip U1 exports a burning voltage and turns off start-up circuit by breaking circuit simultaneously, whole by the auxiliary winding of transformer
It powers after stream filtering to power supply chip U1.As shown in Fig. 2, after the drain electrode of metal-oxide-semiconductor Q4 and Switching Power Supply connect alternating current, it is whole by full-bridge
After flowing bridge D1 rectification, electrolytic capacitor E1 filtering, the anode of the DC voltage after output rectification filter is connected；The source electrode of metal-oxide-semiconductor Q4
It is connected with the drain electrode of metal-oxide-semiconductor Q5 and is connected with one end of transformer T1 primary side；The source electrode and Switching Power Supply of metal-oxide-semiconductor Q5 connects alternating current
Afterwards, after full bridge rectifier bridge D1 rectification, electrolytic capacitor E1 filtering, the cathode of the DC voltage after output rectification filter be connected with
And it is connected with the other end of capacitor C11；The other end of transformer T1 primary side is connected with one end of capacitor C11.The metal-oxide-semiconductor Q4 and
The grid of Q5 passes through a driving chip or driving isolation high frequency transformer.
The Switching Power Supply start-up circuit of the embodiment of the present invention includes by resistance R1, R2, zener diode Z2, electrolytic capacitor E2
Bleeder circuit that composition one is divided for the DC voltage, resistance R3, resistance R5, triode Q2, diode D3 and steady
Press diode Z1.The breaking circuit includes resistance R4, electrolytic capacitor C1 and triode Q1.
One end of the resistance R2 of the Switching Power Supply start-up circuit of the embodiment of the present invention is connect with one end of resistance R1, resistance R1
Other end connection start-up circuit input terminal, which is connected with the filtered anode in commercial power rectification, and resistance R2's is another
End is connected with the anode of the cathode of zener diode Z2 and electrolytic capacitor E2；The anode of voltage-stabiliser tube Z2 and bearing for electrolytic capacitor E2
Pole, power supply chip U1 ground and commercial power rectification be connected filteredly.
The base stage of the transistor Q2 is connected with one end of the collector of transistor Q1 and resistance R3, the current collection of transistor Q2
Pole is connected with the other end of resistance R3 with one end of resistance R1, R2, and the emitter of transistor Q2 is connected with the anode of diode D3；
The cathode of diode D3 and the power pin of power supply chip U1, one end of resistance R5, diode D2 cathode and electrolytic capacitor E3
Anode be connected, the cathode of diode D3 is also connect with the output end VCC of start-up circuit.Two pole of the other end and pressure stabilizing of resistance R5
The cathode of pipe Z1 is connected, and the anode of zener diode Z1 and the ground of power supply chip U1 and commercial power rectification are connected filteredly.
The base stage of transistor Q1 is connected with one end of resistance R4 with one end of capacitor C1, the collector and crystal of transistor Q1
The base stage of pipe Q2 is connected with one end of resistance R3, the other end of the emitter of transistor Q1 and the anode of voltage-stabiliser tube Z1 and capacitor C1
Be connected and with the ground of power supply chip and commercial power rectification it is filtered be connected；The other end of resistance R4 and the benchmark of power supply chip U1
Voltage foot is connected.
As shown in Fig. 2, the working principle of the embodiment of the present invention: after city is electrically accessed, being rectified through full bridge rectifier bridge, electrolytic capacitor
After filtering, the about DC voltage of 310VDC is obtained.Resistance R1, R2, voltage-stabiliser tube Z2, electrolytic capacitor E2 will be straight after rectifying and wave-filtering
Galvanic electricity is divided, and c point is because the voltage of c electricity is 12VDC after voltage-stabiliser tube Z2 pressure stabilizing, then the voltage of a point is about after partial pressure
210VDC；Triode Q1 is in off state at this time, and Q2 is in the conductive state, resistance R3, R5, triode Q2, diode D3, surely
Pressure pipe Z1 forms bleeder circuit all the way, and for d point because the voltage of d point is 12VDC after voltage-stabiliser tube Z1 pressure stabilizing, diode D3 prevents electric current
Reverse-conducting, then the voltage of b point is about 24VDC after partial pressure, triode Q2, diode D3 are in the conductive state, the electricity of VCC point
Pressure is about 23VDC, chip U1 starting, i.e., exportable PWM wave, driving metal-oxide-semiconductor work.The start-up circuit of Switching Power Supply completes its
Start work, while power supply chip U1 is worked normally, the voltage of VCC point is after power supply chip work, output PWM wave driving
Metal-oxide-semiconductor work stablizes the voltage value in setting to electricity after diode D2 rectification, E3 filtering by transformer T1 auxiliary winding
Source chip power supply forms stable power supply chip power supply closed loop；Power supply chip can export the electricity of a stable 5VDC simultaneously
Triode Q1 is connected by resistance R4 at this time in pressure, triode Q2 cut-off, start-up circuit shutdown.
Specifically, the voltage of VCC point is before MOS work, metal-oxide-semiconductor Q4, Q5 are off state, and commercial power rectification filters at this time
Although positive and negative anodes afterwards are connect with metal-oxide-semiconductor Q4, Q5 and transformer, access is not formed, VCC point voltage cannot give power supply
Chip power supply；After start-up circuit starts successfully, power supply chip U1 exports PWM wave driving metal-oxide-semiconductor work, metal-oxide-semiconductor conducting, MOS
Pipe and transformer and commercial power rectification filtering output end form access, and VCC point voltage passes through transformer transformation, diode D2 and capacitor
The burning voltage that setting is formed after E3 rectifying and wave-filtering continues to power to power supply chip, and start-up circuit is closed by breaking circuit at this time
It closes.The voltage setting value of VCC point can be set to obtain according to existing well-known technique.
Claims (5)
1. a kind of start-up circuit of Switching Power Supply, including input terminal and output end VCC, input terminal connection commercial power rectification filtering
The anode of output end afterwards, output end VCC connection power supply chip U1；It is characterized by also including one of the connection input terminal
Bleeder circuit, diode D3, triode Q2 and zener diode Z1；The base stage of triode Q2 accesses described one by resistance R3
Tie point between bleeder circuit and the input terminal, the collector of triode Q2 connect the tie point and the resistance R3
The emitter of one end, triode Q2 passes through diode D3 connection output end VCC；The cathode of the zener diode Z1 passes through resistance
R5 is connect with the cathode of the diode D3, output end VCC；The anode of zener diode Z1 and the ground and alternating current of power supply chip U1
Ground connection after rectifying and wave-filtering.
2. a kind of start-up circuit of Switching Power Supply according to claim 1, it is characterised in that: a bleeder circuit
Including resistance R1, R2, zener diode Z2 and electrolytic capacitor E2；Input terminal is accessed after the resistance R1 and resistance R2 series connection, electricity
Resistance R2 is connected with the anode of the cathode of zener diode Z2 and electrolytic capacitor E2, the cathode and zener diode of electrolytic capacitor E2
The anode of Z2, power supply chip U1 ground and commercial power rectification be connected filteredly；The tie point is located between resistance R1 and R2.
3. a kind of start-up circuit of Switching Power Supply according to claim 2, it is characterised in that: the triode Q1 is NPN
Type universal transistor, Q2 are NPN type low-power high-voltage high speed switching transistors.
4. a kind of start-up circuit of Switching Power Supply according to claim 2 or 3, it is characterised in that: the voltage-stabiliser tube Z1,
Z2 is the voltage-stabiliser tube of 12V；Power supply chip U1 model uses KA3525.
5. a kind of Switching Power Supply further includes breaking circuit including start-up circuit described in claim 1-4 any one, described
Breaking circuit includes that triode Q1 and capacitor C1, the power supply chip U1 pass through the base stage and capacitor C1 of resistance R4 and triode Q1
One end connection, the collector of triode Q1 connect with the base stage of resistance R3 and triode Q2, the emitter of triode Q1 with surely
Press the anode of diode Z1, the other end of capacitor C1 is connected and also filtered with the ground of power supply chip U1 and commercial power rectification
It is connected；The power supply chip U1 is used for after start-up circuit starting, and exporting a burning voltage by the resistance R4 makes triode
Q1 conducting, triode Q2 cut-off, start-up circuit shutdown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811450276.4A CN110011527A (en) | 2018-11-30 | 2018-11-30 | A kind of Switching Power Supply start-up circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811450276.4A CN110011527A (en) | 2018-11-30 | 2018-11-30 | A kind of Switching Power Supply start-up circuit |
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| Publication Number | Publication Date |
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| CN110011527A true CN110011527A (en) | 2019-07-12 |
Family
ID=67165050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811450276.4A Pending CN110011527A (en) | 2018-11-30 | 2018-11-30 | A kind of Switching Power Supply start-up circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102300349A (en) * | 2011-08-22 | 2011-12-28 | 河海大学常州校区 | Electromagnetic sensing heating device and method thereof |
| CN102361402A (en) * | 2011-10-21 | 2012-02-22 | 广州金升阳科技有限公司 | Switching power supply circuit |
| CN202906730U (en) * | 2012-09-20 | 2013-04-24 | 肖应梅 | Self-switching-on-off starting control circuit used for LED flyback driving power supply |
| 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 |
| WO2016015566A1 (en) * | 2014-07-29 | 2016-02-04 | 广州金升阳科技有限公司 | Soft start method and circuit |
| CN106685205A (en) * | 2017-03-23 | 2017-05-17 | 广州市爱浦电子科技有限公司 | Power supply starting circuit having low output short-circuit protection power consumption |
| CN209283086U (en) * | 2018-11-30 | 2019-08-20 | 浙江大学台州研究院 | A kind of Switching Power Supply start-up circuit and Switching Power Supply |
-
2018
- 2018-11-30 CN CN201811450276.4A patent/CN110011527A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102300349A (en) * | 2011-08-22 | 2011-12-28 | 河海大学常州校区 | Electromagnetic sensing heating device and method thereof |
| CN102361402A (en) * | 2011-10-21 | 2012-02-22 | 广州金升阳科技有限公司 | Switching power supply circuit |
| CN202906730U (en) * | 2012-09-20 | 2013-04-24 | 肖应梅 | Self-switching-on-off starting control circuit used for LED flyback driving power supply |
| 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 |
| WO2016015566A1 (en) * | 2014-07-29 | 2016-02-04 | 广州金升阳科技有限公司 | Soft start method and circuit |
| CN106685205A (en) * | 2017-03-23 | 2017-05-17 | 广州市爱浦电子科技有限公司 | Power supply starting circuit having low output short-circuit protection power consumption |
| CN209283086U (en) * | 2018-11-30 | 2019-08-20 | 浙江大学台州研究院 | A kind of Switching Power Supply start-up circuit and Switching Power Supply |
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