CN2909729Y - Power supply soft start-up circuit and TV. set with the soft start-up circuit - Google Patents
Power supply soft start-up circuit and TV. set with the soft start-up circuit Download PDFInfo
- Publication number
- CN2909729Y CN2909729Y CN 200620082158 CN200620082158U CN2909729Y CN 2909729 Y CN2909729 Y CN 2909729Y CN 200620082158 CN200620082158 CN 200620082158 CN 200620082158 U CN200620082158 U CN 200620082158U CN 2909729 Y CN2909729 Y CN 2909729Y
- Authority
- CN
- China
- Prior art keywords
- power supply
- circuit
- transformer
- diode
- soft start
- Prior art date
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a power supply soft start-up circuit and a television having the power supply soft start-up circuit, comprising a transformer. The secondary circuit of the transformer is earthed through a resistance, an optical coupler and a three-terminal adjustable voltage stabilizer connected in series. A connecting node of the optical coupler and the three-terminal adjustable voltage stabilizer is connected to the positive pole of a switching diode. The negative pole of the switching diode is on one side earthed through an energy-saving capacitor and on the other side connected to the secondary circuit of the transformer through a resistance and a leak diode connected in parallel. The utility model simply adds a soft start-up circuit to a feedback circuit of a television power supply and has the soft start-up circuit operate when the power supply starts up, which prevents the overcurrent in the power supply circuit and the damage to the switching tube and does not influence the normal feedback of the power supply after starting up. Thereby, the utility model not only well protects the television power supply but also ensures the stability and reliability of the operation of the power supply circuit. The utility model can be widely used in the power supply circuits of all types of household electric appliances.
Description
Technical field
The utility model belongs to the power circuit technical field, specifically, relates to be in and realize the control circuit of soft startup of electric power when establishing machine by cable in a kind of power supply that can be applicable to home appliance such as television set.
Background technology
In present TV set power, generally all comprise transformer, switching tube and feedback circuit.In television boot-strap moment, the output of power supply is not also set up, at this moment, feedback circuit is inoperative, and circuit is in uncontrollable state, causes the duty ratio work of the switching tube of primary with maximum, thereby the electric current by switching tube is continued to increase, cause the saturated of transformer sometimes, be easy to cause power supply switch tube to burn and damage, thereby reduced the stability and the reliability of television set work because of overcurrent.
Summary of the invention
Power circuit is in uncontrollable state in the moment of starting shooting to the utility model in the prior art in order to solve; thereby the problem that causes the power supply switch tube overcurrent to damage easily; the dynamo-electric source of a kind of novel TV soft starting circuit is provided; by set up simple soft starting circuit power supply secondary; can make television set at start moment holding circuit overcurrent not, thereby the power circuit of home appliance is played a very good protection.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of soft startup circuit for power supply and have the television set of described soft starting circuit, comprise transformer, secondary resistance, optocoupler and the three-terminal voltage regulator ground connection through series connection of transformer are connected with a storage capacitor at the luminous end of described optocoupler and the connected node place of three-terminal voltage regulator.
As further qualification to technique scheme, described optocoupler links to each other with the positive pole of a switching diode with the connected node of three-terminal voltage regulator, the negative pole of described switching diode is connected the secondary of described transformer through parallel resistor with the diode of releasing on the other hand on the one hand through described storage capacitor ground connection; The positive pole of the described diode of releasing connects described storage capacitor, and negative pole connects the secondary of transformer.
Compared with prior art; advantage of the present utility model and good effect are: the utility model is by increasing simple soft starting circuit on the basis of TV set power feedback circuit; it when starting shooting, power supply is worked; keep not overcurrent of power circuit; avoid damage that switching tube is caused; and after start, do not influence the normal feedback of power supply; thereby not only TV set power is played a very good protection; but also effectively guaranteed the stability and the reliability of power circuit work, can be widely used in the power circuit of multiple home appliance.
Description of drawings
Fig. 1 is the schematic diagram of the utility model soft startup circuit for power supply.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
Among Fig. 1, electric power output voltage VCC, resistance R 1, optocoupler U1 and three-terminal voltage regulator U2 form the power supply feedback circuit, and the model of described three-terminal voltage regulator U2 is that TL431 or the trim that adopts other types realize.Do not increasing before the soft starting circuit, television boot-strap moment, the secondary VCC of power transformer not output or output does not also reach when making three-terminal voltage regulator U2 work, and feedback circuit is inoperative.At this moment, optocoupler U1 is feedback not, causes the duty ratio work of the elementary switching tube of power supply with maximum, thereby the electric current by switching tube is continued to increase, and causes transformer saturated sometimes, causes switching tube to be burnt because of overcurrent.For this reason, the utility model has increased the soft starting circuit of being made up of diode D1, D2, resistance R 2 and capacitor C 1 on the basis of feedback circuit.Wherein, the positive pole of diode D1 links to each other with the connected node of three-terminal voltage regulator U2 with optocoupler U1, and negative pole is connected the secondary VCC of transformer on the other hand on the one hand through storage capacitor C1 ground connection with the diode D2 that releases through parallel resistor R2.
After increasing soft starting circuit, in television boot-strap moment, when secondary voltage VCC has some output, but before also not reaching stable output, output voltage V CC gives storage capacitor C1 charging by resistance R 1, optocoupler U1 and diode D1, thereby makes U1 level of optocoupler produce electric current, switching tube conducting in the control primary circuit, make it controlled, reduce the starup current of switching tube, realize the soft start of power supply with this.
After the circuit operate as normal, output voltage V CC constantly gives storage capacitor C1 charging through resistance R 2, make its voltage reach the magnitude of voltage of VCC gradually, thereby make diode D1 anti-inclined to one side, do not influence the purpose of the original feedback circuit work of power supply when being implemented in the television set operate as normal.
When television set shut down, VCC voltage was zero volt, and at this moment, the energy that is stored in the capacitor C 1 discharges by the diode D2 that releases, thereby did not influence the start once more of television set.
The utility model has been realized the soft start of power circuit by adopting above-mentioned simple circuit configuration; make television set at start moment holding circuit overcurrent not; thereby play a very good protection, this also has bigger directive significance to the application of other circuit from now on.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (6)
1. a soft startup circuit for power supply comprises transformer, and secondary resistance, optocoupler and the three-terminal voltage regulator ground connection through series connection of transformer is characterized in that: be connected with a storage capacitor at the luminous end of described optocoupler and the connected node place of three-terminal voltage regulator.
2. soft startup circuit for power supply according to claim 1, it is characterized in that: described optocoupler links to each other with the positive pole of a switching diode with the connected node of three-terminal voltage regulator, the negative pole of described switching diode is connected the secondary of described transformer through parallel resistor with the diode of releasing on the other hand on the one hand through described storage capacitor ground connection.
3. soft startup circuit for power supply according to claim 2 is characterized in that: the positive pole of the described diode of releasing connects described storage capacitor, and negative pole connects the secondary of transformer.
4. television set with the described soft startup circuit for power supply of claim 1, comprise transformer, secondary resistance, optocoupler and the three-terminal voltage regulator ground connection through series connection of transformer is characterized in that: be connected with a storage capacitor at the luminous end of described optocoupler and the connected node place of three-terminal voltage regulator.
5. television set according to claim 4, it is characterized in that: described optocoupler links to each other with the positive pole of a switching diode with the connected node of three-terminal voltage regulator, the negative pole of described switching diode is connected the secondary of described transformer through parallel resistor with the diode of releasing on the other hand on the one hand through described storage capacitor ground connection.
6. television set according to claim 5 is characterized in that: the positive pole of the described diode of releasing connects described storage capacitor, and negative pole connects the secondary of transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620082158 CN2909729Y (en) | 2006-03-17 | 2006-03-17 | Power supply soft start-up circuit and TV. set with the soft start-up circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620082158 CN2909729Y (en) | 2006-03-17 | 2006-03-17 | Power supply soft start-up circuit and TV. set with the soft start-up circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2909729Y true CN2909729Y (en) | 2007-06-06 |
Family
ID=38128938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620082158 Expired - Fee Related CN2909729Y (en) | 2006-03-17 | 2006-03-17 | Power supply soft start-up circuit and TV. set with the soft start-up circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2909729Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101714813B (en) * | 2009-12-15 | 2012-06-06 | 天水华天微电子股份有限公司 | Soft start circuit of switch power supply |
| CN101437127B (en) * | 2008-12-12 | 2013-01-30 | 康佳集团股份有限公司 | Soft startup circuit for television set |
| CN106410742A (en) * | 2016-11-03 | 2017-02-15 | 长沙群瑞电子科技有限公司 | High-speed DC electronic fuse circuit |
| CN109067166A (en) * | 2018-09-19 | 2018-12-21 | 西安微电子技术研究所 | A kind of Discrete control soft starting circuit of DC/DC converter |
| CN109687700A (en) * | 2019-02-27 | 2019-04-26 | 山东超越数控电子股份有限公司 | A kind of DC-DC converter restores soft starting circuit and starting method fastly |
| CN110113845A (en) * | 2019-06-06 | 2019-08-09 | 湖南凯上电子科技有限公司 | A kind of LED illumination power supply eyeshield SS (soft start) control circuit |
| CN110572022A (en) * | 2019-09-02 | 2019-12-13 | 广州视源电子科技股份有限公司 | Soft start circuit, method and electric equipment |
-
2006
- 2006-03-17 CN CN 200620082158 patent/CN2909729Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101437127B (en) * | 2008-12-12 | 2013-01-30 | 康佳集团股份有限公司 | Soft startup circuit for television set |
| CN101714813B (en) * | 2009-12-15 | 2012-06-06 | 天水华天微电子股份有限公司 | Soft start circuit of switch power supply |
| CN106410742A (en) * | 2016-11-03 | 2017-02-15 | 长沙群瑞电子科技有限公司 | High-speed DC electronic fuse circuit |
| CN109067166A (en) * | 2018-09-19 | 2018-12-21 | 西安微电子技术研究所 | A kind of Discrete control soft starting circuit of DC/DC converter |
| CN109687700A (en) * | 2019-02-27 | 2019-04-26 | 山东超越数控电子股份有限公司 | A kind of DC-DC converter restores soft starting circuit and starting method fastly |
| CN110113845A (en) * | 2019-06-06 | 2019-08-09 | 湖南凯上电子科技有限公司 | A kind of LED illumination power supply eyeshield SS (soft start) control circuit |
| CN110113845B (en) * | 2019-06-06 | 2024-03-22 | 湖南凯上电子科技有限公司 | Eye protection soft start control circuit of LED illumination power supply |
| CN110572022A (en) * | 2019-09-02 | 2019-12-13 | 广州视源电子科技股份有限公司 | Soft start circuit, method and electric equipment |
| CN110572022B (en) * | 2019-09-02 | 2020-10-13 | 广州视源电子科技股份有限公司 | Soft start circuit, method and electric equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2909729Y (en) | Power supply soft start-up circuit and TV. set with the soft start-up circuit | |
| CN200976577Y (en) | MOS tube driving circuit and television set having the same | |
| CN100592614C (en) | Source electrode driven inverse-excitation converting circuit | |
| CN201230282Y (en) | Auxiliary electric source actuating apparatus for solar photovoltaic combining inverter | |
| CN101355293B (en) | Soft startup circuit for power supply | |
| CN103683263A (en) | Circuit for preventing reverse plug in of direct current power supply and lamp | |
| CN102969782B (en) | Chip starting circuit | |
| CN202818087U (en) | Starting circuit for high-voltage input switching power supply | |
| CN202424502U (en) | Switching power supply circuit | |
| CN202443265U (en) | Under-voltage locking circuit with temperature compensation and reference voltage circuit | |
| CN201860094U (en) | Short circuit protection circuit for switch power | |
| CN101552553B (en) | Simple and reliable pre-bias load starting circuit | |
| CN101437126A (en) | Power supply control method, circuit and television set | |
| CN103857109B (en) | A kind of constant-current voltage-stabilizing drive circuit and light fixture | |
| CN103034607B (en) | Plug-and-play circuit, interface circuit and electronic equipment assembly | |
| CN202495882U (en) | Power supply circuit and television | |
| CN209200927U (en) | Start-up circuit and Switching Power Supply for Switching Power Supply | |
| CN204993947U (en) | LED drive power supply makes up dimmer circuit | |
| CN218449478U (en) | XLR microphone protection circuit | |
| CN204335061U (en) | LED dimming driving circuit and output current control circuit thereof and bypass composite device | |
| CN204886132U (en) | Prevent voltage pulse circuit | |
| CN206788682U (en) | A kind of high-end linear voltage-stabilizing circuit | |
| CN219760863U (en) | Time delay switch circuit of BOOST PFC circuit | |
| CN212277915U (en) | Protection circuit of multi-output power supply | |
| CN117220494B (en) | Adjusting circuit for single-stage PFC (power factor correction) applied to quick-charging product and quick-charging product |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070606 Termination date: 20100317 |