CN108039814A - A kind of adjustable high-voltage starting circuit of output voltage - Google Patents
A kind of adjustable high-voltage starting circuit of output voltage Download PDFInfo
- Publication number
- CN108039814A CN108039814A CN201711356202.XA CN201711356202A CN108039814A CN 108039814 A CN108039814 A CN 108039814A CN 201711356202 A CN201711356202 A CN 201711356202A CN 108039814 A CN108039814 A CN 108039814A
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- China
- Prior art keywords
- triode
- diode
- voltage
- emitter
- resistance
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The present invention provides a kind of adjustable high-voltage starting circuit of output voltage,Its is reasonable in design,Output voltage can be directed to load flexible modulation,Load can effectively be prevented to be damaged,It can ensure that the normal startup of Switching Power Supply at the same time,It includes resistance R1,R2,Resistance R1,High-voltage power supply HV is connected after one end connection of R2,The base stage of the other end difference connecting triode Q1 of resistance R1,The collector of Q3,The collector of the other end difference connecting triode Q1 of resistance R2,The collector of Q2,The base stage of the emitter connecting triode Q2 of triode Q1,The emitter of triode Q2 connects the anode of diode string respectively,Direct voltage source VCC,One end of capacitance C1,The base stage of the cathode connected to the transistor Q3 of diode string,The emitter of triode Q3 is grounded after being connected with the other end of capacitance C1.
Description
Technical field
The present invention relates to Switching Power Supply start-up circuit technical field, is specially a kind of adjustable high voltage startup electricity of output voltage
Road.
Background technology
At present, LED drive chip often needs high-voltage starting circuit to provide a stable voltage, existing high voltage startup
Circuit output voltage is non-adjustable, and suitable power scope is relatively narrow, very flexible, is generally only the negative of constant power or fixed number
Carry to provide and start voltage, when the bearing power or number of circuit system change, if replacing start-up circuit not in time, when
Preceding high-voltage starting circuit may because supply voltage and bearing power mismatch cause the Switching Power Supply of LED drive chip without
Method normally starts, or the impaired problem of load elements occurs.
The content of the invention
For output voltage existing in the prior art is non-adjustable, power bracket is narrow, very flexible, Switching Power Supply can not be just
Often start, load the problems such as being easily damaged, the present invention provides a kind of adjustable high-voltage starting circuit of output voltage, its structure is set
Meter is reasonable, and output voltage can be directed to load flexible modulation, can effectively prevent load and be damaged, while can ensure that Switching Power Supply just
Often start.
A kind of adjustable high-voltage starting circuit of output voltage, it includes resistance R1, R2, and one end of described resistance R1, R2 connect
High-voltage power supply HV is connected after connecing, it is characterised in that the base stage of the other end difference connecting triode Q1 of the resistance R1, the current collection of Q3
Pole, the other end of the resistance R2 connect the collector of the triode Q1, the collector of Q2, the hair of the triode Q1 respectively
Emitter-base bandgap grading connects the base stage of the triode Q2, and the emitter of the triode Q2 connects the anode of diode string, direct current respectively
One end of potential source VCC, capacitance C1, the cathode of the diode string connect the base stage of the triode Q3, the triode Q3's
Emitter is grounded after being connected with the other end of the capacitance C1.
It is further characterized by,
The diode string is joined end to end by diode D1, D2, D3 ... Dn and is formed, described in the cathode connection of the diode D1
The base stage of triode Q3, the cathode of the diode Dn connect respectively the emitter of the triode Q2, direct voltage source VCC,
One end of capacitance C1；
End to end diode D1, D2, D3 ... Dn in the diode string is changed to zener diode TD1, the voltage stabilizing
The anode of diode TD1 connects the base stage of the triode Q3, and the cathode of the zener diode TD1 connects three pole respectively
The emitter of pipe Q2, direct voltage source VCC, one end of capacitance C1.
Apply the present invention to the high voltage startup of LED drive chip Switching Power Supply, according to the load watt level, spirit
It is living to adjust the number of diode or the type of diode in diode string, make itself and bearing power and the change phase of number of loads
Match somebody with somebody, so as to achieve the purpose that flexible modulation high-voltage starting circuit output voltage, the voltage of direct voltage source VCC is adjusted to n*Vd
+ 0.6V, n are diode number, and Vd is the both ends pressure drop of diode string, so that output voltage power bracket broadens, and then
Effectively prevention load is damaged, while ensures the purpose that LED drive chip Switching Power Supply normally starts.
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.
Embodiment
Embodiment one, as shown in Figure 1, a kind of adjustable high-voltage starting circuit of output voltage, it includes resistance R1, R2, institute
High-voltage power supply HV is connected after stating one end connection of resistance R1, R2, it is characterised in that the other end of the resistance R1 connects three poles respectively
The base stage of pipe Q1, the collector of Q3, the other end of the resistance R2 connect the collector of the triode Q1, the current collection of Q2 respectively
Pole, the emitter of the triode Q1 connect the base stage of the triode Q2, and the emitter of the triode Q2 connects two respectively
The anode of pole pipe D1, direct voltage source VCC, one end of capacitance C1, diode D1, D2, D3 ... Dn join end to end to be formed
Diode string, the cathode of the diode Dn connect the base stage of the triode Q3, the emitter of the triode Q3 with it is described
It is grounded after the other end connection of capacitance C1.
Its concrete operating principle is as described below：At the beginning of system electrification, capacitance C1 both end voltages are 0V, and at this moment LED drives core
Piece does not work, and over time, high-voltage power supply HV gives capacitance C1 quick charges, and electricity by resistance R1, triode Q1, Q2
Stream is amplified by triode Q1, Q2, when electric current reaches the breakdown current of diode string, diode D1, D2, D3 ... Dn
The diode string conducting of formation, the output voltage of DC power supply VCC changes, be n*Vd+0.6V, and triode Q3 is led at this time
Opening up and open, start-up circuit completes startup work, and automatically into low power consumpting state.The number of diode D1, D2, D3 ... Dn
It can be adjusted according to bearing power.
Embodiment two, as shown in Fig. 2, a kind of adjustable high-voltage starting circuit of output voltage, it includes resistance R1, R2, institute
High-voltage power supply HV is connected after stating one end connection of resistance R1, R2, it is characterised in that the other end of the resistance R1 connects three poles respectively
The base stage of pipe Q1, the collector of Q3, the other end of the resistance R2 connect the collector of the triode Q1, the current collection of Q2 respectively
Pole, the emitter of the triode Q1 connect the base stage of the triode Q2, and the emitter of the triode Q2 connects surely respectively
The cathode, direct voltage source VCC, one end of capacitance C1 of diode TD1 is pressed, described in the anode connection of the zener diode TD1
The base stage of triode Q3, the emitter of the triode Q3 are grounded after being connected with the other end of the capacitance C1.
Its concrete operating principle is as described below：At the beginning of system electrification, capacitance C1 both end voltages are 0V, and at this moment LED drives core
Piece does not work, and over time, high-voltage power supply HV gives capacitance C1 quick charges, and electricity by resistance R1, triode Q1, Q2
Stream is amplified by triode Q1, Q2, and when voltage reaches the breakdown voltage of zener diode TD1, DC power supply VCC's is defeated
Going out voltage to change, be Vtd+0.6V, the conducting of triode Q3 at this time is opened, and start-up circuit completes startup work, and certainly
It is dynamic to enter low power consumpting state.
Claims (3)
1. a kind of adjustable high-voltage starting circuit of output voltage, it includes resistance R1, R2, one end connection of described resistance R1, R2
High-voltage power supply HV is connected afterwards, it is characterised in that the base stage of the other end difference connecting triode Q1 of the resistance R1, the current collection of Q3
Pole, the other end of the resistance R2 connect the collector of the triode Q1, the collector of Q2, the hair of the triode Q1 respectively
Emitter-base bandgap grading connects the base stage of the triode Q2, and the emitter of the triode Q2 connects the anode of diode string, direct current respectively
One end of potential source VCC, capacitance C1, the cathode of the diode string connect the base stage of the triode Q3, the triode Q3's
Emitter is grounded after being connected with the other end of the capacitance C1.
A kind of 2. adjustable high-voltage starting circuit of output voltage according to claim 1, it is characterised in that：The diode
String is joined end to end by diode D1, D2, D3 ... Dn to be formed, and the cathode of the diode D1 connects the base of the triode Q3
Pole, the cathode of the diode Dn connect the emitter, direct voltage source VCC, one end of capacitance C1 of the triode Q2 respectively.
A kind of 3. adjustable high-voltage starting circuit of output voltage according to claim 1, it is characterised in that：By two pole
End to end diode D1, D2, D3 ... Dn is changed to zener diode TD1, the anode of the zener diode TD1 in pipe string
Connect the base stage of the triode Q3, the cathode of the zener diode TD1 connects the emitter of the triode Q2, straight respectively
Galvanic electricity potential source VCC, one end of capacitance C1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711356202.XA CN108039814A (en) | 2017-12-16 | 2017-12-16 | A kind of adjustable high-voltage starting circuit of output voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711356202.XA CN108039814A (en) | 2017-12-16 | 2017-12-16 | A kind of adjustable high-voltage starting circuit of output voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108039814A true CN108039814A (en) | 2018-05-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711356202.XA Pending CN108039814A (en) | 2017-12-16 | 2017-12-16 | A kind of adjustable high-voltage starting circuit of output voltage |
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| Country | Link |
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| CN (1) | CN108039814A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2692368Y (en) * | 2004-03-29 | 2005-04-13 | 重庆三力达电子有限公司 | Gasoline engine integrated ignitor |
| CN202818087U (en) * | 2012-07-30 | 2013-03-20 | 中国航天科工集团第三研究院第八三五七研究所 | Starting circuit for high-voltage input switching power supply |
| CN203574536U (en) * | 2013-09-23 | 2014-04-30 | 深圳科士达科技股份有限公司 | Starting circuit of PWM chip of wide-voltage auxiliary power source |
| CN104124878A (en) * | 2014-07-23 | 2014-10-29 | 上海晶丰明源半导体有限公司 | Power supply module, switch power supply chip and switch power supply system |
| CN104333722A (en) * | 2014-10-30 | 2015-02-04 | 青岛歌尔声学科技有限公司 | Low power consumption starting circuit and liquid crystal television |
-
2017
- 2017-12-16 CN CN201711356202.XA patent/CN108039814A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2692368Y (en) * | 2004-03-29 | 2005-04-13 | 重庆三力达电子有限公司 | Gasoline engine integrated ignitor |
| CN202818087U (en) * | 2012-07-30 | 2013-03-20 | 中国航天科工集团第三研究院第八三五七研究所 | Starting circuit for high-voltage input switching power supply |
| CN203574536U (en) * | 2013-09-23 | 2014-04-30 | 深圳科士达科技股份有限公司 | Starting circuit of PWM chip of wide-voltage auxiliary power source |
| CN104124878A (en) * | 2014-07-23 | 2014-10-29 | 上海晶丰明源半导体有限公司 | Power supply module, switch power supply chip and switch power supply system |
| CN104333722A (en) * | 2014-10-30 | 2015-02-04 | 青岛歌尔声学科技有限公司 | Low power consumption starting circuit and liquid crystal television |
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Application publication date: 20180515 |