CN101207332A - Starting circuit and switch power source thereof - Google Patents
Starting circuit and switch power source thereof Download PDFInfo
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- CN101207332A CN101207332A CNA2006101578156A CN200610157815A CN101207332A CN 101207332 A CN101207332 A CN 101207332A CN A2006101578156 A CNA2006101578156 A CN A2006101578156A CN 200610157815 A CN200610157815 A CN 200610157815A CN 101207332 A CN101207332 A CN 101207332A
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Abstract
The invention discloses a switching power source and a starting circuit of the switching power source, wherein, the starting circuit is used for the power supply of a PWM control chip that is used for controlling the switching of the power FET; under the starting mode, the power for the PWM controlling chip is supplied by a starting circuit capacitor with smaller capacity value, thereby guaranteeing that the system has short starting time; after the starting is successful, under the normal working mode, a larger capacitor is connected with the starting circuit capacitor in parallelism through a switch to supply power for the PWM controlling chip, thereby reducing the ripples of the power-supply voltage of the switching power source in normal work and improving the stability of the system. Using the switching power source of the starting circuit prevents a high-voltage element from being introduced into the PWM controlling chip, thereby reducing the production process requirement of the chip, reducing the production cost of the PWM chip and reducing the starting time of the system as far as possible while reducing the power consumption.
Description
Technical field
The present invention relates to the switch power technology field, be specifically related to a kind of Switching Power Supply that is used to switch power controller the start-up circuit of electric energy to be provided and to use this start-up circuit.
Background technology
At present, switching power circuit utilizes the unlatching or the shutoff of PWM (abbreviation of pulse-width modulation) control chip power controlling field effect transistor, wherein a lot of switch power supply systems require all that integrated high-tension device constitutes a start-up circuit in the PWM chip, thereby produce the needed lower bias voltage of chip internal.So not only the design to chip has proposed requirement, the more important thing is that this scheme requires brilliant first factory that the device that bears suitable high pressure can be provided.But in fact be not that each brilliant first producer can both meet the demands, and high voltage bearing device often to exceed on price much than commonplace components.U.S. Pat 5581453 has disclosed a kind of start-up circuit that is used for Switching Power Supply.This power supply comprises a transformer, is switched by a switching transistor, so that periodically be connected to input voltage.The recurrent pulse that drives described switching transistor is provided by a power control circuit.In order to start such power supply, this power supply is equipped with a start-up circuit, comprises a starting resistance and an electric capacity.This start-up circuit provides initial power for power control circuit.In addition, also by one on the transformer auxiliary winding power supply, the voltage on this winding is offered power control circuit by rectification to described power control circuit then.In the power initiation process, for the power supply of power control circuit is born by start-up circuit fully.Above-mentioned starting resistance will charge for electric capacity, make the voltage of power control circuit rise.During beginning, voltage is lower on the transformer, and therefore, voltage does not participate in being the power control circuit power supply on the auxiliary winding of transformer.Crossed after one period start-up time, the output voltage of power supply begins to rise.So the voltage that can obtain on the auxiliary winding of transformer also begins to rise.When the voltage on the auxiliary winding was enough high, it was the power control circuit power supply that described winding will replace start-up circuit.The defective of this power supply is that start-up time is longer.In order to reduce the power consumption in the starting resistance, the resistance of starting resistance is chosen as big as far as possible, but can make startup slack-off like this, because high value makes that can only obtain very little starting current to charge for the electric capacity with its coupling.
In order to overcome the defective relevant with energy consumption, above-mentioned U.S. Pat 5581453 has disclosed a kind of switching transistor, makes its collection-penetrate primary current path to connect with starting resistance.During power initiation, this switching transistor is in conducting state, makes described resistance starting electric current.At the power supply normal operation period, described switching transistor is in nonconducting state, has prevented the energy consumption in the starting resistance.One of defective of this structure is the degeneration that is easy to cause switching transistor, because this switching transistor is by instead coming stop conducting partially with base-penetrate knot; Another defective of such scheme is to need high pressure resistant device.
Summary of the invention
The technical problem to be solved in the present invention is, at above-mentioned shortcoming of the prior art, provide a kind of not requiring to comprise high voltage bearing device in the used pwm chip, simultaneously can effectively reduce the whole system power loss and reduce the start-up circuit of start-up time of system and the Switching Power Supply of using this start-up circuit as far as possible.
According to a first aspect of the present invention, a kind of start-up circuit of Switching Power Supply is provided, the power supply of controller (115) controlled make it less start-up mode of electric current and the bigger normal mode of electric current, comprise: order is connected in series in being used between supply voltage switch input and the ground and reduces the resistance of power consumption and be used under start-up mode first electric capacity that reduces start-up time, and the connection node between described resistance and described first electric capacity is connected to the feeder ear of described controller; Being connected being used under normal mode of operation between described controller test side and the ground is in parallel to improve second electric capacity 107 of the stability of a system with described first electric capacity 103; Be connected the described feeder ear of described controller and and described test side between, be used for start or normal mode of operation under, disconnect or closed gate-controlled switch; When described controller 115 detects described detection terminal VCC voltage greater than predetermined reference value, control described gate-controlled switch 106 closures by the CONTROL terminal, 103 and second electric capacity 107 of winning is connected in parallel, makes controller enter the bigger normal mode of operation of operating current; Described controller (115) then is operated in the less start-up mode of operating current when detecting described detection terminal VCC (104) voltage less than predetermined reference value.
According to a second aspect of the present invention, a kind of Switching Power Supply of using described start-up circuit is provided, comprise: the controller that the described switching device of voltage input end, voltage output end, transformer, switching device, control switches, and the startup stage be the start-up circuit of described controller power supply; It is characterized in that: described start-up circuit comprises: order is connected in series in being used between described voltage input end and the ground and reduces the resistance of power consumption and be used under start-up mode first electric capacity that reduces start-up time, and the connection node between described resistance and described first electric capacity is connected to the feeder ear of described controller; Being connected being used under normal mode of operation between described controller test side and the ground is in parallel to improve second electric capacity of the stability of a system with described first electric capacity; Be connected the described feeder ear of described controller and and described test side between, be used for start or normal mode of operation under, disconnect or closed gate-controlled switch; When described controller 115 detects described detection terminal VCC voltage greater than predetermined reference value, control described gate-controlled switch 106 closures by the CONTROL terminal, win electric capacity 103 and second electric capacity 107 are connected in parallel, make controller enter the bigger normal mode of operation of operating current; Described controller 115 then is operated in the less start-up mode of operating current when detecting described detection terminal VCC voltage less than predetermined reference value.
Also comprised by Switching Power Supply provided by the invention: described voltage output end output voltage is fed back to the feedback loop of described controller, and described controller is controlled the conducting state of described switching device according to feedback signal.
Implement start-up circuit of the present invention and Switching Power Supply thereof, have following beneficial effect: under the power initiation pattern, be the pwm chip power supply by the start-up circuit electric capacity than low-capacitance, the system that guaranteed has less start-up time; After starting successfully, under normal mode of operation, with a bigger electric capacity by switch with the parallel connection of described start-up circuit electric capacity, be the pwm chip power supply, thereby the ripple of supply power voltage when having reduced the Switching Power Supply operate as normal improves the stability of system.Use the Switching Power Supply of described start-up circuit, avoided in pwm chip, introducing high tension apparatus, thereby reduce the technological requirement of chip manufacturing, reduce PWM chip manufacturing cost, when reducing power consumption, reduce the start-up time of system again as far as possible.Because the pwm chip that adopts has two kinds of mode of operations: start-up mode and normal mode, operating current is very little under start-up mode, can reduce start-up time, improves the stability of system; Operating current is bigger under normal mode, and there is advantages of higher stability in the system of assurance.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the system module connection diagram according to Switching Power Supply of the present invention;
Fig. 2 is a pwm chip internal module connection diagram.
Embodiment
In the Switching Power Supply shown in Fig. 1, the input voltage that voltage input end 101 places are applied is converted to the output voltage at voltage output end 111 places.Terminal 101,111 is coupled to the transformer 110 with winding 110a and secondary winding 110b.The drain terminal of power field effect pipe 116 is received winding 110a one time, and the source end is by a grounding through resistance.Pwm chip 115 is by the conducting or the shutoff of GDV drive terminal 113 power controlling field effect transistor.Feedback loop 114 feeds back to pwm chip 115 with the output voltage at terminal 111 places, and chip is according to the duty ratio of this feedback signal adjusting GDV drive terminal output signal, the conducting state of regulating power field effect pipe.The DC input voitage of 101 ends is charged by 102 pairs of start-up circuit electric capacity 103 of a current-limiting resistance, and an end of electric capacity 103 is connected to the VCC terminal 104 of pwm chip 115.
During system start-up, chip detects the voltage of VCC terminal.In system starting process, the voltage of pwm chip detection terminal VCC (104), as VCC during less than a reference voltage, pwm chip is operated in the less start-up mode of operating current; When the voltage of terminal VCC 104 during greater than a reference voltage, pwm chip with switch (106) closure, makes the win electric capacity and the second electric capacity parallel connection by CONTROL terminal 105, and pwm chip enters normal mode of operation afterwards.In other words, chip is started working, and at first enters start-up mode, and under this pattern, chip is less relatively to the electric current that start-up circuit electric capacity extracts by the VCC terminal, and the power that chip consumes is less.Because when chip is Once you begin worked, the voltage of VCC terminal 104 will be controlled in a lower voltage, because the input voltage of 101 terminals has very big voltage difference with between the voltage of VCC terminal, so require current-limiting resistance 102 will reduce power consumption more greatly, but consider that current-limiting resistance is big more, the start-up time of circuit is long more.So the resistance of this resistance is wanted suitable setting, guaranteeing that satisfying whole system reduces power consumption in the requirement start-up time again as much as possible.In order to reduce the power consumption here, be necessary to improve the resistance of current-limiting resistance 102, under the condition that satisfies the system start-up time, must reduce the appearance value of start-up circuit electric capacity 103.Consider pwm chip 115 in case start, chip will extract starting current to start-up circuit electric capacity 103 by the VCC terminal, and in order to guarantee the stability of system, this starting current must be controlled in the quite little value.In order to achieve this end, pwm chip is provided with a start-up mode.Only some circuit module work of chip internal under start-up mode, other circuit modules are in idle state.Under the start-up mode of pwm chip, chip is quite little from the starting current that start-up circuit electric capacity 103 extracts by the VCC terminal, and the assurance chip can stably be finished start-up mode, enters the normal mode of operation state then.When in a single day chip enters normal mode of operation, the electric current that extracts by the VCC terminal will increase a lot with respect to start-up mode, under this mode of operation, start-up circuit electric capacity 103 is because the appearance value is less, will cause the change in voltage of VCC terminal bigger, thereby produce bigger ripple, make the system works instability.In order to address this problem transformer charging circuit 110 is separated with a gate-controlled switch 106 with start-up circuit.Under start-up mode, this switch disconnects.Make starting current just to 103 chargings of start-up circuit electric capacity, guarantee that the start-up time of system is shorter.Pwm chip detects the voltage of VCC_char simultaneously, when this voltage surpasses certain value, CONTROL signal controlling gate-controlled switch 106 closures that chip produces make start-up circuit follow the transformer charging circuit to link together, and chip internal enters normal mode of operation simultaneously.Chip extracts bigger electric current by terminal VCC, because start-up circuit electric capacity 103 is followed 107 parallel connections of transformer charging capacitor, the appearance value becomes two electric capacity sums under this pattern.The ripple of VCC voltage when this structure will reduce operate as normal, the stability of raising system.
Among Fig. 2, hysteresis loop comparator 226 compares the voltage and the reference voltage 218 of VCC terminal 104, and voltage comparator 227 compares the voltage and the reference voltage 219 of VCC_char terminal 117.And, make judgement according to the value of these two voltages, make chip operation in start-up mode or be operated under the normal mode.The switching of chip operation pattern is that the control by 105 pairs of gate-controlled switches 221 of CONTROL terminal realizes.Gate-controlled switch 221 can be selected normal mode of operation 221a, or start-up mode 221b is as the reference terminal of PWM comparator 228, the PWM comparator compares source end 222 voltages and this effective reference terminal voltage of power field effect pipe 116, comes the duty ratio of adjustment doors drive circuit 225 output waveform GDV.And the maximum duty cycle of gate drive circuit 225 output waveform GDV is controlled by a NOR gate 224 by the square-wave signal of the certain frequency of square wave signal generator 223 generations.
Claims (6)
1. the start-up circuit of a Switching Power Supply is characterized in that, the power supply of controller (115) is controlled made it less start-up mode of electric current and the bigger normal mode of electric current, comprising:
Order is connected in series in the resistance that is used to reduce power consumption (102) between supply voltage switch input (101) and the ground and is used under start-up mode minimizing first electric capacity (103) of start-up time, and the connection node between described resistance (102) and described first electric capacity (103) is connected to the feeder ear of described controller (115);
Being connected being used under normal mode of operation between described controller (115) test side and the ground is in parallel to improve second electric capacity (107) of the stability of a system with described first electric capacity (103);
Be connected the described feeder ear of described controller (115) and and described test side between, be used under start-up mode or normal mode, disconnect or closed gate-controlled switch (106);
When described controller (115) detects described detection terminal VCC (104) voltage greater than predetermined reference value, control described gate-controlled switch (106) closure by the CONTROL terminal, make and win (103) and second electric capacity (107) is connected in parallel, make controller enter the bigger normal mode of operation of operating current; Described controller (115) then is operated in the less start-up mode of operating current when detecting described detection terminal VCC (104) voltage less than predetermined reference value.
2. the start-up circuit of Switching Power Supply according to claim 1 is characterized in that described controller is the PMW controller.
3. one kind is used the Switching Power Supply of start-up circuit according to claim 1, comprise: voltage input end (101), voltage output end (111), transformer (110), switching device (116), control the controller (115) that described switching device (116) switches between start-up mode and normal mode, and the startup stage be the start-up circuit (118) of described controller (115) power supply; It is characterized in that: described start-up circuit (118) comprising:
Order is connected in series in the resistance that is used to reduce power consumption (102) between described voltage input end (101) and the ground and is used under start-up mode minimizing first electric capacity (103) of start-up time, and the connection node between described resistance (102) and described first electric capacity (103) is connected to the feeder ear of described controller (115);
Being connected being used under normal mode of operation between described controller (115) test side and the ground is in parallel to improve second electric capacity (107) of the stability of a system with described first electric capacity (103);
Be connected the described feeder ear of described controller (115) and and described test side between, be used for start or normal mode of operation under, disconnect or closed gate-controlled switch (106);
When described controller (115) detects described detection terminal VCC (104) voltage greater than predetermined reference value, control described gate-controlled switch (106) closure by the CONTROL terminal, make and win (103) and second electric capacity (107) is connected in parallel, make controller enter the bigger normal mode of operation of operating current; Described controller (115) then is operated in the less start-up mode of operating current when detecting described detection terminal VCC (104) voltage less than predetermined reference value.
4. Switching Power Supply as claimed in claim 3, it is characterized in that: described Switching Power Supply also comprises: described voltage output end (111) output voltage is fed back to the feedback loop (114) of described controller (115), and described controller (115) is controlled the conducting state of described switching device (116) according to feedback signal.
5. as claim 3 or 4 described Switching Power Supplies, it is characterized in that: described controller (115) is a pwm chip.
6. as claim 3 or 4 described Switching Power Supplies, it is characterized in that: described switching device (116) is a power field effect pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101578156A CN100557933C (en) | 2006-12-21 | 2006-12-21 | Start-up circuit and Switching Power Supply thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101578156A CN100557933C (en) | 2006-12-21 | 2006-12-21 | Start-up circuit and Switching Power Supply thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101207332A true CN101207332A (en) | 2008-06-25 |
| CN100557933C CN100557933C (en) | 2009-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101578156A Active CN100557933C (en) | 2006-12-21 | 2006-12-21 | Start-up circuit and Switching Power Supply thereof |
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| CN (1) | CN100557933C (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102667658A (en) * | 2009-10-28 | 2012-09-12 | 艾沃特有限公司 | Low power consumption start-up circuit with dynamic switching |
| CN103023337A (en) * | 2013-01-11 | 2013-04-03 | 聚辰半导体(上海)有限公司 | Power circuit of switching power converter |
| CN103138551A (en) * | 2011-11-30 | 2013-06-05 | 深圳市明微电子股份有限公司 | Control method and device for low current started and low voltage protection circuit |
| CN103296894A (en) * | 2013-05-21 | 2013-09-11 | 辉芒微电子（深圳）有限公司 | Controllable constant-current output circuit |
| TWI420795B (en) * | 2010-11-10 | 2013-12-21 | Noveltek Semiconductor Corp | Start-up circuit with lowered power consumption |
| 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 |
| CN109450222A (en) * | 2018-10-24 | 2019-03-08 | 广州金升阳科技有限公司 | A kind of Switching Power Supply control IC energy supply circuit |
| CN109494998A (en) * | 2018-12-29 | 2019-03-19 | 青岛亿联客信息技术有限公司 | A kind of single live wire power getting control system and method |
| CN112311218A (en) * | 2019-07-31 | 2021-02-02 | 坦帕科技(北京)有限公司 | Enabling control method of floating switch power supply |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07123709A (en) * | 1993-10-28 | 1995-05-12 | Matsushita Electric Ind Co Ltd | Power unit |
| CN1209680A (en) * | 1997-08-22 | 1999-03-03 | 明碁电脑股份有限公司 | Improved low-power-consumption power-supply provider |
| JP3570270B2 (en) * | 1999-02-22 | 2004-09-29 | 松下電器産業株式会社 | Power supply |
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2006
- 2006-12-21 CN CNB2006101578156A patent/CN100557933C/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102667658A (en) * | 2009-10-28 | 2012-09-12 | 艾沃特有限公司 | Low power consumption start-up circuit with dynamic switching |
| TWI420795B (en) * | 2010-11-10 | 2013-12-21 | Noveltek Semiconductor Corp | Start-up circuit with lowered power consumption |
| CN103138551A (en) * | 2011-11-30 | 2013-06-05 | 深圳市明微电子股份有限公司 | Control method and device for low current started and low voltage protection circuit |
| CN103138551B (en) * | 2011-11-30 | 2016-07-27 | 深圳市明微电子股份有限公司 | A kind of small area analysis starts the control method with under-voltage protecting circuit and device |
| CN103023337A (en) * | 2013-01-11 | 2013-04-03 | 聚辰半导体(上海)有限公司 | Power circuit of switching power converter |
| CN103023337B (en) * | 2013-01-11 | 2015-07-22 | 聚辰半导体(上海)有限公司 | Power circuit of switching power converter |
| CN103296894A (en) * | 2013-05-21 | 2013-09-11 | 辉芒微电子（深圳）有限公司 | Controllable constant-current output circuit |
| CN103296894B (en) * | 2013-05-21 | 2016-06-15 | 辉芒微电子（深圳）有限公司 | A kind of controllable constant-current output circuit |
| 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 |
| CN109450222A (en) * | 2018-10-24 | 2019-03-08 | 广州金升阳科技有限公司 | A kind of Switching Power Supply control IC energy supply circuit |
| CN109494998A (en) * | 2018-12-29 | 2019-03-19 | 青岛亿联客信息技术有限公司 | A kind of single live wire power getting control system and method |
| CN112311218A (en) * | 2019-07-31 | 2021-02-02 | 坦帕科技(北京)有限公司 | Enabling control method of floating switch power supply |
Also Published As
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|---|---|
| CN100557933C (en) | 2009-11-04 |
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Address after: 518057 room 5-8, 10th floor, Changhong science and technology building, South 12th Road, science and Technology Park, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Huimang Microelectronics (Shenzhen) Co.,Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Shekou along the road 6, jialitai Building 8 Building A room Patentee before: FREMONT MICRO DEVICES (SHENZHEN) Ltd. |
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