CN102761239A - Constant current and voltage starting circuit of switch power supply controller - Google Patents
Constant current and voltage starting circuit of switch power supply controller Download PDFInfo
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- CN102761239A CN102761239A CN2012102685964A CN201210268596A CN102761239A CN 102761239 A CN102761239 A CN 102761239A CN 2012102685964 A CN2012102685964 A CN 2012102685964A CN 201210268596 A CN201210268596 A CN 201210268596A CN 102761239 A CN102761239 A CN 102761239A
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Abstract
The invention provides a constant current and voltage starting circuit of a switch power supply controller. The constant current and voltage starting circuit comprises a high voltage constant current circuit and a constant current control circuit, wherein the high voltage constant current circuit is used for charging an external capacitor of a power supply end of the switch power supply controller by a constant high voltage starting current; and the constant current control circuit is used for controlling turn-off of the high voltage constant current circuit when the voltage at the power supply end of the switch power supply controller is detected to be less than a preset starting voltage and is used for controlling turn-on of the high voltage constant current circuit when the voltage at the power supply end of the switch power supply controller is detected to be less than a preset shutdown voltage. According to the invention, the switch power supply controller is charged through the constant high voltage starting current, so that the switch power supply controller is rapidly started; after the switch power supply controller is started, the constant high voltage starting current can be effectively shut off, so that the efficiency of a switch power supply is increased; and when a switch power supply is in a standby state, energy loss of the switch power supply system is reduced.
Description
Technical field
The present invention relates to a kind of constant current high-voltage starting circuit, relate in particular to a kind of constant current high-voltage starting circuit of switch power controller.
Background technology
Along with development of electronic technology, switch power supply system becomes the main application of power-supply system with the performance of excellence and application widely.In the today of advocating energy-conserving and environment-protective, various power-supply systems are increasingly high to the demand that reduces power consumption, and various countries make strict efficiency standard to the power-supply system of different power consumption grade one after another; Like: Energy Star regulation, 50W (watt) 0.3W can not be surpassed with the stand-by power consumption of interior power-supply system.
At present, the electric current that when starting, flows through starting resistance that act as of starting resistance charges for the external capacitor of the power end VCC of control chip in the typical application of Switching Power Supply.Because this resistance is connected across between AC (interchange) rectifying and wave-filtering electric capacity and chip external capacitor,, will there be electric current on the resistance as long as AC power supplies powers on.The start-up time of power-supply system can be longer if starting resistance is big, and the electric current that continues on the resistance if starting resistance is less to flow through can be bigger.Especially when power-supply system is in underloading or Light Condition, the ratio regular meeting that power consumed accounts for system power dissipation on the starting resistance significantly increases.In order to take into account start-up time and system power dissipation, starting resistance can be selected the megaohm rank for use in general the application, but even so, the power consumption when high pressure 264V (volt) uses on the starting resistance also has tens milliwatts to milliwatts up to a hundred.
Summary of the invention
Main purpose of the present invention is to provide a kind of constant current high-voltage starting circuit of switch power controller, when shortening power-supply system start-up time, reduces the energy consumption on the starting resistance, improves system effectiveness, reduces stand-by power consumption.
In order to achieve the above object, the invention provides a kind of constant current high-voltage starting circuit of switch power controller, comprising:
The high voltage and constant current circuit, being used for the constant high pressure starting current is the external capacitor charging of the power end of switch power controller;
Constant-current control circuit; Be used for when the power end voltage that detects said switch power controller is higher than predetermined starting resistor control and turn-off said high voltage and constant current circuit, and when the power end voltage that detects said switch power controller is lower than predetermined shutoff voltage, control and open said high voltage and constant current circuit.
During enforcement, said high voltage and constant current circuit is further used for detecting through stabling current the external capacitor charging of the resistance voltage power end that constant high voltage startup electric current is provided is switch power controller.
During enforcement, said high voltage and constant current circuit comprises N type high pressure FET, first FET, second FET, voltage clamp module, current sense resistor and withstand voltage current limliting module, wherein,
The drain electrode of said N type high pressure FET and an end of said withstand voltage current limliting module are connected with the high-pressure side of switch power controller respectively;
The grid of said N type high pressure FET is connected with the other end of said withstand voltage current limliting module, and is connected with the drain and gate of said first FET and the drain electrode of second FET;
The source electrode of said N type high pressure FET is connected with an end of said current sense resistor;
The source electrode of said first FET is connected with an end of said voltage clamp module;
The other end of said voltage clamp module and the other end of said current sense resistor are connected with the power end of said switch power controller respectively, and are connected with the ground end of said switch power controller through external capacitor;
The grid of said second FET inserts the output signal of said constant-current control circuit;
The source electrode of said second FET is connected with the ground end of said switch power controller.
During enforcement, said voltage clamp module comprises the voltage clamp pipe; Said withstand voltage current limliting module comprises withstand voltage current-limiting resistance; Said withstand voltage current-limiting resistance is a high-tension resistive;
The drain and gate of said voltage clamp pipe is connected with the source electrode of said first FET respectively;
The source electrode of said voltage clamp pipe is connected with the power end of said switch power controller.
During enforcement, said voltage clamp module comprises the voltage clamp pipe;
Said withstand voltage current limliting module comprises depletion type N type high pressure FET and current limliting unit;
The drain electrode of said depletion type N type high pressure FET is connected with the high-pressure side of switch power controller;
The grid of said N type high pressure FET is connected with an end of said current limliting unit and the grid of said depletion type N type high pressure FET;
The drain and gate of said voltage clamp pipe is connected with the source electrode of said first FET respectively;
The source electrode of said depletion type N type high pressure FET is connected with the other end of said current limliting unit;
The source electrode of said voltage clamp pipe is connected with the power end of said switch power controller.
During enforcement, said current limliting unit is current-limiting resistance or compares metal-oxide-semiconductor.
Compared with prior art; The constant current high-voltage starting circuit of switch power controller of the present invention not only charges to switch power controller through constant starting current and has realized the quick startup of controller; After controller is realized starting, can effectively turn-off the efficient that starting current has improved switch power supply system, and when the power supply standby, reduce the energy loss of system.
Description of drawings
Fig. 1 is the structured flowchart of first embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention;
Fig. 2 is the circuit diagram of second embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention;
Fig. 3 is the circuit diagram of the 3rd embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention;
Fig. 4 is the circuit diagram of the 4th embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention;
Fig. 5 is the circuit diagram of the 5th embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention.
Embodiment
For making the object of the invention, technical scheme and advantage express clearlyer, the present invention is done further detailed explanation again below in conjunction with accompanying drawing and specific embodiment.
The mode of practical implementation of the present invention is not limited only to following description, combines accompanying drawing further explanation in addition at present.
As shown in Figure 1, first embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention comprises:
High voltage and constant current circuit 10 is connected with the high-pressure side HV of switch power controller, and being used for the constant high pressure starting current is the external capacitor CVCC charging of the power end VCC of switch power controller;
Constant-current control circuit 20; Be connected with said high voltage and constant current circuit 10; Be used for when the power end voltage that detects said switch power controller is higher than predetermined starting resistor control and turn-off said high voltage and constant current circuit, and when the power end voltage that detects said switch power controller is lower than predetermined shutoff voltage, control and open said high voltage and constant current circuit.
First embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention; Charge to switch power controller through the constant high pressure starting current; Thereby realized the quick startup of switch power controller; After switch power controller is realized starting, can effectively turn-off the efficient that the constant high pressure starting current has improved switch power supply system, and when the Switching Power Supply standby, reduce the energy loss of switch power supply system.
During enforcement, said high voltage and constant current circuit 10 is further used for detecting through stabling current the external capacitor charging of the resistance voltage power end that constant high voltage startup electric current is provided is switch power controller.
Fig. 2 is the circuit diagram of second embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention.
Second embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention is based on first embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention.
As shown in Figure 2, in second embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention,
Said high voltage and constant current circuit 10 comprises N type high pressure FET M0, the first FET M1, the second FET M2, voltage clamp module 101, current sense resistor R1 and withstand voltage current limliting module 102, wherein,
The drain electrode of said N type high pressure FET M0 and an end of said withstand voltage current limliting module 102 are connected with the high-pressure side HV of switch power controller respectively;
The grid of said N type high pressure FET M0 is connected with the other end of said withstand voltage current limliting module 102, and is connected with the drain and gate of the said first FET M1 and the drain electrode of the second FET M2;
The source electrode of said N type high pressure FET M0 is connected with the end of said current sense resistor R1;
The source electrode of the said first FET M1 is connected with an end of said voltage clamp module 101;
The other end of the other end of said voltage clamp module 101 and said current sense resistor R1 is connected with the power end VCC of said switch power controller respectively, and is connected with the ground end GND of said switch power controller through external capacitor CVCC;
The grid of the said second FET M2 inserts the output signal HVEN of said constant-current control circuit 20;
The source electrode of the said second FET M2 is connected with the ground end GND of said switch power controller;
Said constant-current control circuit 20 comprises voltage detection module 201, wherein
The power end VCC of the input of said voltage detection module 201 and said switch power controller connects, and connects, and the output HVEN of said voltage detection module 201 is connected with the grid of the second FET M2 that said high voltage and constant current circuit 10 comprises;
Said high voltage and constant current circuit 10 the startup stage; Draw the grid voltage of N type high pressure FET M0 and make its conducting on the electric current that provides through withstand voltage current limliting module 102; Starting current is flowed through the drain electrode of N type high pressure FET M0 to the source electrode of N type high pressure FET M0 from the high-pressure side HV of switch power controller; Starting current flows through current sense resistor R1 and forms a detection voltage; When detecting the clamp voltage that voltage surpasses voltage clamp module 101, thereby can reducing the grid voltage of N type high pressure FET M0, voltage clamp module 101 limits its conducting, reach the purpose of limiting starting current size;
The resistance of the clamp voltage of said voltage clamp module and said current sense resistor R1 determines the size of high pressure constant current jointly.
Fig. 3 is the circuit diagram of the 3rd embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention.
The 3rd embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention is based on second embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention.
As shown in Figure 3, in the 3rd embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention,
Said voltage clamp module comprises voltage clamp pipe M3;
Said withstand voltage current limliting module comprises withstand voltage current-limiting resistance R2;
Said voltage detection module is a hysteresis voltage comparator 2011;
The drain electrode of said N type high pressure FET M0 and the end of said withstand voltage current-limiting resistance R2 are connected with the high-pressure side HV of switch power controller respectively;
The grid of said N type high pressure FET M0 is connected with the other end of said withstand voltage current-limiting resistance R2, and is connected with the drain and gate of the said first FET M1 and the drain electrode of second FET;
The source electrode of said N type high pressure FET M0 is connected with the end of said current sense resistor R1;
The source electrode of the said first FET M1 is connected with the drain and gate of said voltage clamp pipe M3;
The source electrode of said voltage clamp pipe M3 and the other end of said current sense resistor R1 are connected with the power end VCC of said switch power controller respectively, and are connected with the ground end GND of said switch power controller through external capacitor CVCC;
The grid of the said second FET M2 inserts the output signal HVEN of said constant-current control circuit 20;
The source electrode of the said second FET M2 is connected with the ground end GND of said switch power controller.
In the 3rd embodiment, said withstand voltage current-limiting resistance R2 is a high-tension resistive, to guarantee the operate as normal of internal circuit;
And said withstand voltage current-limiting resistance R2 must be enough greatly, enough little to guarantee that said high voltage and constant current circuit 10 flows through the electric current of said withstand voltage current-limiting resistance R2 when closing, thus the power consumption when power consumption when reducing said switch power controller operate as normal and standby.
In the 3rd embodiment, the clamp voltage of said voltage clamp module 101 can be the threshold voltage of said voltage clamp pipe M3, the forward conduction voltage of diode or the reverse voltage of Zener diode.
As shown in Figure 3, in the 3rd embodiment, said constant-current control circuit 20 comprises:
Fig. 4 is the circuit diagram of the 4th embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention.
The 4th embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention is based on second embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention.
As shown in Figure 4, in the 4th embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention,
Said voltage clamp module 101 comprises voltage clamp pipe M3;
Said withstand voltage current limliting module 102 comprises depletion type N type high pressure FET M4 and current limliting unit 1021;
The drain electrode of said N type high pressure FET M0 is connected with the high-pressure side HV of switch power controller respectively with the drain electrode of said depletion type N type high pressure FET M4;
The grid of said N type high pressure FET M0 is connected with an end of said current limliting unit 1012 and the grid of said depletion type N type high pressure FET M4, and is connected with the drain and gate of the said first FET M1 and the drain electrode of second FET;
The source electrode of said N type high pressure FET M0 is connected with the end of said current sense resistor R1;
The source electrode of the said first FET M1 is connected with the drain and gate of said voltage clamp pipe M3;
The source electrode of said depletion type N type high pressure FET M4 is connected with the other end of said current limliting unit 1012;
The source electrode of said voltage clamp pipe M3 and the other end of said current sense resistor R1 are connected with the power end VCC of said switch power controller respectively, and are connected with the ground end GND of said switch power controller through external capacitor CVCC;
The grid of the said second FET M2 inserts the output signal HVEN of said constant-current control circuit 20;
The source electrode of the said second FET M2 is connected with the ground end GND of said switch power controller.
In the 4th embodiment, the clamp voltage of said voltage clamp module 101 can be the threshold voltage of said voltage clamp pipe M3, the forward conduction voltage of diode or the reverse voltage of Zener diode;
The threshold voltage of said voltage clamp pipe M3 and the resistance of said current sense resistor R1 determine the size of high pressure constant current jointly;
Said current limliting unit can or fall than metal-oxide-semiconductor (metal-oxide layer-semiconductor-field-effect transistor) for current-limiting resistance;
Said voltage detection module is a hysteresis voltage comparator 2011.
In the 4th embodiment, integrated two high tension apparatus in same chip: N type high pressure FET M0 and depletion type N type high pressure FET M4;
The drain electrode of said N type high pressure FET M0 and said depletion type N type high pressure FET M4 drain electrode combine through special layout design.
Fig. 5 is the circuit diagram of the 5th embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention.
The 5th embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention is based on the 4th embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention.
As shown in Figure 5, in the 5th embodiment of the constant current high-voltage starting circuit of switch power controller of the present invention,
Said current limliting unit is current-limiting resistance R3;
Said voltage detection module is a hysteresis voltage comparator 2011.
Can know by technique scheme; The high-voltage starting circuit of switch power controller of the present invention; Integrated high voltage start-up circuit in switch power controller; Not only charge to switch power controller,, and after switch power controller is realized starting, can turn-off the constant high pressure starting current effectively with the quick startup of realization switch power controller through the constant high pressure starting current; Improving the efficient of switch power supply system, and when the Switching Power Supply standby, reduce the energy loss of switch power supply system.
More than explanation is just illustrative for the purpose of the present invention; And nonrestrictive, those of ordinary skills understand, under the situation of spirit that does not break away from accompanying claims and limited and scope; Can make many modifications, variation or equivalence, but all will fall in protection scope of the present invention.
Claims (7)
1. the constant current high-voltage starting circuit of a switch power controller is characterized in that, comprising:
The high voltage and constant current circuit, being used for the constant high pressure starting current is the external capacitor charging of the power end of switch power controller;
Constant-current control circuit; Be used for when the power end voltage that detects said switch power controller is higher than predetermined starting resistor control and turn-off said high voltage and constant current circuit, and when the power end voltage that detects said switch power controller is lower than predetermined shutoff voltage, control and open said high voltage and constant current circuit.
2. the constant current high-voltage starting circuit of switch power controller as claimed in claim 1; It is characterized in that; Said high voltage and constant current circuit is further used for detecting through stabling current the external capacitor charging of the resistance voltage power end that constant high voltage startup electric current is provided is switch power controller.
3. the constant current high-voltage starting circuit of switch power controller according to claim 1; It is characterized in that; Said high voltage and constant current circuit comprises N type high pressure FET, first FET, second FET, voltage clamp module, current sense resistor and withstand voltage current limliting module, wherein
The drain electrode of said N type high pressure FET and an end of said withstand voltage current limliting module are connected with the high-pressure side of switch power controller respectively;
The grid of said N type high pressure FET is connected with the other end of said withstand voltage current limliting module, and is connected with the drain and gate of said first FET and the drain electrode of second FET;
The source electrode of said N type high pressure FET is connected with an end of said current sense resistor;
The source electrode of said first FET is connected with an end of said voltage clamp module;
The other end of said voltage clamp module and the other end of said current sense resistor are connected with the power end of said switch power controller respectively, and are connected with the ground end of said switch power controller through external capacitor;
The grid of said second FET inserts the output signal of said constant-current control circuit;
The source electrode of said second FET is connected with the ground end of said switch power controller.
4. the constant current high-voltage starting circuit of switch power controller as claimed in claim 3 is characterized in that, said voltage clamp module comprises the voltage clamp pipe; Said withstand voltage current limliting module comprises withstand voltage current-limiting resistance; Said withstand voltage current-limiting resistance is a high-tension resistive;
The drain and gate of said voltage clamp pipe is connected with the source electrode of said first FET respectively;
The source electrode of said voltage clamp pipe is connected with the power end of said switch power controller.
5. the constant current high-voltage starting circuit of switch power controller as claimed in claim 3 is characterized in that,
Said voltage clamp module comprises the voltage clamp pipe;
Said withstand voltage current limliting module comprises depletion type N type high pressure FET and current limliting unit;
The drain electrode of said depletion type N type high pressure FET is connected with the high-pressure side of switch power controller;
The grid of said N type high pressure FET is connected with an end of said current limliting unit and the grid of said depletion type N type high pressure FET;
The drain and gate of said voltage clamp pipe is connected with the source electrode of said first FET respectively;
The source electrode of said depletion type N type high pressure FET is connected with the other end of said current limliting unit;
The source electrode of said voltage clamp pipe is connected with the power end of said switch power controller.
6. the constant current high-voltage starting circuit of switch power controller as claimed in claim 5 is characterized in that,
Said current limliting unit is current-limiting resistance or compares metal-oxide-semiconductor.
7. like the constant current high-voltage starting circuit of the described switch power controller of arbitrary claim in the claim 3 to 6, it is characterized in that,
Said constant-current control circuit comprises voltage detection module;
The input of said voltage detection module is connected with the power end of said switch power controller, and the output of said voltage detection module is connected with the grid of second FET that said high voltage and constant current circuit comprises.
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| CN201210268596.4A CN102761239B (en) | 2012-07-31 | 2012-07-31 | Constant current and voltage starting circuit of switch power supply controller |
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| CN201210268596.4A CN102761239B (en) | 2012-07-31 | 2012-07-31 | Constant current and voltage starting circuit of switch power supply controller |
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| CN103036441A (en) * | 2013-01-11 | 2013-04-10 | 成都启臣微电子有限公司 | High-voltage started high frequency flyback PWM (Pulse Width Modulation) control circuit |
| CN103078486A (en) * | 2013-01-10 | 2013-05-01 | 无锡华润上华半导体有限公司 | High-voltage starting circuit in power supply converter |
| CN103683892A (en) * | 2013-12-30 | 2014-03-26 | 杭州士兰微电子股份有限公司 | Switching power supply and controller thereof |
| CN104578840A (en) * | 2013-10-28 | 2015-04-29 | 欧姆龙株式会社 | Power supply circuit and electronic equipment with same |
| CN104897951A (en) * | 2015-06-26 | 2015-09-09 | 林�源 | Alarm device and method |
| CN105790564A (en) * | 2016-04-13 | 2016-07-20 | 深圳市赢新光电发展有限公司 | Starting circuit and switch power supply |
| CN105955379A (en) * | 2016-06-16 | 2016-09-21 | 电子科技大学 | High-voltage starting circuit with turning off function |
| CN113541462A (en) * | 2020-04-20 | 2021-10-22 | 西安鼎芯微电子有限公司 | High-voltage starting circuit and switching power supply circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103078486A (en) * | 2013-01-10 | 2013-05-01 | 无锡华润上华半导体有限公司 | High-voltage starting circuit in power supply converter |
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| CN104897951A (en) * | 2015-06-26 | 2015-09-09 | 林�源 | Alarm device and method |
| CN104897951B (en) * | 2015-06-26 | 2019-02-15 | 林�源 | A kind of warning device and method |
| CN105790564A (en) * | 2016-04-13 | 2016-07-20 | 深圳市赢新光电发展有限公司 | Starting circuit and switch power supply |
| CN105790564B (en) * | 2016-04-13 | 2018-05-08 | 深圳茂硕电子科技有限公司 | A kind of start-up circuit and Switching Power Supply |
| CN105955379A (en) * | 2016-06-16 | 2016-09-21 | 电子科技大学 | High-voltage starting circuit with turning off function |
| CN105955379B (en) * | 2016-06-16 | 2017-05-31 | 电子科技大学 | A kind of high-voltage starting circuit for turning off |
| CN113541462A (en) * | 2020-04-20 | 2021-10-22 | 西安鼎芯微电子有限公司 | High-voltage starting circuit and switching power supply circuit |
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| CN102761239B (en) | 2015-04-22 |
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Address after: 611731, room 1, building 3, No. 401, West Avenue, Chengdu hi tech Zone (West District, Sichuan) Patentee after: Chengdu Qi Chen electronic Limited by Share Ltd Address before: 611731 innovation center, No. 4, West core road, hi tech West District, Sichuan, Chengdu C341-343 Patentee before: Chengdu Chip-Rail Microelectronic Co., Ltd. |