CN102548158A - Light load control structure of power supply using logic link control (LLC) topology - Google Patents
Light load control structure of power supply using logic link control (LLC) topology Download PDFInfo
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- CN102548158A CN102548158A CN2012100854205A CN201210085420A CN102548158A CN 102548158 A CN102548158 A CN 102548158A CN 2012100854205 A CN2012100854205 A CN 2012100854205A CN 201210085420 A CN201210085420 A CN 201210085420A CN 102548158 A CN102548158 A CN 102548158A
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Abstract
The invention discloses a light load control structure of a power supply using logic link control (LLC) topology, which is composed of an output signal collection module, a triangular wave generator, a comparator and an LLC control module. The comparator compares feedback signals output by the signal collection module with triangular waves having fixed frequency and amplitude and output by a triangular wave generator so that pulse width modulation (PWM) signals with fixed frequency and duty ratio changing along with load are generated, intermittent working of the LLC control module is controlled, and a problem that a light-emitting diode (LED) lamp twinkles when light load outputs by using the LLC topology as LED driving is solved radically.
Description
Technical field
The invention belongs to the control structure of Switching Power Supply, relate in particular to the control structure of power supply of the use LLC topology of a kind of LED of being applicable to illumination.
Background technology
LED is a kind of display device of function admirable, has long, energy-conservation, high brightness, multiple glow color of life-span, an advantage such as response speed is fast and driving voltage is low.In energy savings, can also regulate the LED luminous intensity, change glow color, realize multiple display effect.Apply to fields such as city lighting, construction landscape illumination, stage lighting design now in a large number.
In the light modulation utilization, dimming mode commonly used has PWM light modulation and linearity light adjusting.The PWM light modulation refers to the Kai Heguan of quick control LED lamp pearl, thereby reaches the purpose of regulating brightness.Linearity light adjusting is meant to change and flows through the electric current of LED lamp pearl, thereby reaches the purpose of regulating brightness.At present; What common high-power LED light modulation was used is LLC topological sum linearity light adjusting, and when the light modulation electric current was less, LLC need get into the control gap mode of operation; But the frequency of present gap mode of operation generally is uncontrollable, causes the LED light-emitting flash in the practice easily.
Summary of the invention
In view of in the conventional art during LLC underloading frequency uncontrollable gap work cause the problem of the flicker of light easily; The present invention proposes a kind of underloading control structure of power supply of the LLC of use topology; This structure gets into the controlled discontinuous operation pattern of frequency with power supply, thereby has stopped the generation that lamp dodges.
Technical scheme of the present invention is following:
A kind of underloading control structure of using the power supply of LLC topology is made up of output signal acquisition module, triangular-wave generator, comparator and LLC control module; The output signal acquisition module is connected with the output of LLC power supply, and is connected to the end of oppisite phase of comparator; Triangular-wave generator is connected to the in-phase end of comparator; The output of comparator is connected with the LLC control module; The LLC control module is connected with the switching tube of LLC power supply; Said comparator is relatively by the feedback signal of output signal acquisition module output and the triangular wave of being fixed by the frequency and the amplitude of triangular-wave generator output; The pwm signal that generation fixed-frequency, duty ratio change with output loading, the LLC control module is according to the discontinuous operation of this pwm signal control power supply.
Its further technical scheme is: said output signal acquisition module is made up of two operational amplifiers and an optocoupler; The two-way output of LLC power supply is connected respectively to the end of oppisite phase of two operational amplifiers; The output of two operational amplifiers all is connected with optocoupler, is connected with compensating network between the end of oppisite phase of two operational amplifiers and the output respectively.
Its further technical scheme is: said triangular-wave generator by operational amplifier with and peripheral electric capacity, resistance form.
Its further technical scheme is: said comparator is made up of operational amplifier.
Useful technique effect of the present invention is:
Operating time when control structure of the present invention can make the power supply discontinuous operation changes, but the discontinuous operation fixed-frequency.Thereby make the power supply of utilization LLC topology when underloading, get into the controlled discontinuous operation pattern of frequency.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is a hardware circuit diagram of the present invention.
Embodiment
Further specify below in conjunction with the accompanying drawing specific embodiments of the invention.
Fig. 1 shows composition frame chart of the present invention.As shown in Figure 1, in the power supply that uses the LLC topology, the present invention is made up of output signal acquisition module A, triangular-wave generator B, comparator C and LLC control module D.Remaining part among Fig. 1 is to use the Switching Power Supply of LLC topology.Wherein, output signal acquisition module A is connected with the output of LLC power supply, and is connected to the end of oppisite phase of comparator C; Triangular-wave generator B is connected to the in-phase end of comparator C; The output of comparator C is connected with LLC control module C; LLC control module C is connected with the switching tube of LLC power supply.
Comparator C is passed through the output signal of comparison output signal acquisition module A and the triangular wave of the fixed-frequency that triangular-wave generator B exports, and output frequency is fixed, and duty ratio is controlled the discontinuous operation of LLC control module D with the pwm signal of load size variation.
Fig. 2 is clear embodiment of the present invention with more detailed hardware circuit diagram.
As shown in Figure 2, hardware configuration of the present invention mainly is made up of operational amplifier OP1, operational amplifier OP2, operational amplifier OP3, operational amplifier OP4, optocoupler OPTO and LLC control module.Wherein, operational amplifier OP1, operational amplifier OP2 and optocoupler OPTO form output signal acquisition module A; Operational amplifier OP3 and capacitor C 1, resistance R 1, resistance R 2, resistance R 3 are formed triangular-wave generator B; Operational amplifier OP4 forms comparator C.
Operational amplifier OP1, operational amplifier OP2 gather the output information of LLC power supply and are delivered to former limit control circuit through optocoupler OPTO.Triangular-wave generator B output frequency that operational amplifier OP3 and capacitor C 1, resistance R 1, resistance R 2, resistance R 3 are formed and the fixing triangular wave of amplitude, the triangular wave of output is exported to the end in the same way of operational amplifier OP4 through the backward end of operational amplifier OP3.Operational amplifier OP4 is through making comparisons the feedback signal of optocoupler OPTO and the triangular wave of operational amplifier OP3, and output frequency is fixed, duty ratio is with the pwm signal of output loading state variation, utilizes the discontinuous operation of this pwm signal control LLC control module D.
Above-described only is preferred implementation of the present invention, the invention is not restricted to above embodiment.Be appreciated that other improvement and variation that those skilled in the art directly derive or associate under the prerequisite that does not break away from basic design of the present invention, all should think to be included within protection scope of the present invention.
Claims (4)
1. a underloading control structure of using the power supply of LLC topology is characterized in that: be made up of output signal acquisition module, triangular-wave generator, comparator and LLC control module; The output signal acquisition module is connected with the output of LLC power supply, and is connected to the end of oppisite phase of comparator; Triangular-wave generator is connected to the in-phase end of comparator; The output of comparator is connected with the LLC control module; The LLC control module is connected with the switching tube of LLC power supply;
Said comparator is relatively by the feedback signal of output signal acquisition module output and the triangular wave of being fixed by the frequency and the amplitude of triangular-wave generator output; The pwm signal that generation fixed-frequency, duty ratio change with output loading, the LLC control module is according to the discontinuous operation of this pwm signal control power supply.
2. according to the said underloading control structure of using the power supply of LLC topology of claim 1; It is characterized in that: said output signal acquisition module is made up of two operational amplifiers and an optocoupler; The two-way output of LLC power supply is connected respectively to the end of oppisite phase of two operational amplifiers; The output of two operational amplifiers all is connected with optocoupler, is connected with compensating network between the end of oppisite phase of two operational amplifiers and the output respectively.
3. according to the underloading control structure of the power supply of the said use of claim 1 LLC topology, it is characterized in that: said triangular-wave generator by operational amplifier with and peripheral electric capacity, resistance form.
4. according to the underloading control structure of the topological power supply of the said use of claim 1 LLC, it is characterized in that: said comparator is made up of operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012100854205A CN102548158A (en) | 2012-03-28 | 2012-03-28 | Light load control structure of power supply using logic link control (LLC) topology |
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| CN2012100854205A CN102548158A (en) | 2012-03-28 | 2012-03-28 | Light load control structure of power supply using logic link control (LLC) topology |
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| CN102548158A true CN102548158A (en) | 2012-07-04 |
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| CN2012100854205A Pending CN102548158A (en) | 2012-03-28 | 2012-03-28 | Light load control structure of power supply using logic link control (LLC) topology |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103945594A (en) * | 2013-01-22 | 2014-07-23 | 上海鸣志自动控制设备有限公司 | Circuit for improving scintillation problem of series half-bridge resonance light modulation |
| CN108494256A (en) * | 2018-03-15 | 2018-09-04 | 湖北理工学院 | A kind of the LLC resonant converter underloading voltage modulation system and modulation strategy of energy feedback |
| CN109560706A (en) * | 2017-09-27 | 2019-04-02 | 昱京能源科技股份有限公司 | PSR current control system under LLC framework |
| CN110957926A (en) * | 2019-11-22 | 2020-04-03 | 深圳南云微电子有限公司 | Light load detection and frequency reduction control method and circuit |
| TWI717247B (en) * | 2020-03-30 | 2021-01-21 | 通嘉科技股份有限公司 | Power controller and control method for llc resonant converter |
| CN113394985A (en) * | 2021-07-21 | 2021-09-14 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, resonant converter and integrated circuit control chip |
| CN113517816A (en) * | 2020-04-10 | 2021-10-19 | 通嘉科技股份有限公司 | Control method of LLC resonant converter and power supply controller |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101631409A (en) * | 2009-08-20 | 2010-01-20 | 英飞特电子（杭州）有限公司 | Pulse-width modulation (PWM) light-adjusting circuit for light-emitting diode (LED) |
| CN201956897U (en) * | 2010-09-19 | 2011-08-31 | 石家庄国耀电子科技有限公司 | Logical link control (LLC) topology circuit output overcurrent constant current protection circuit for switching power supply |
| CN202551438U (en) * | 2012-03-28 | 2012-11-21 | 无锡安特源科技有限公司 | Light-load control structure for power source using LLC (logical link control) topology |
-
2012
- 2012-03-28 CN CN2012100854205A patent/CN102548158A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101631409A (en) * | 2009-08-20 | 2010-01-20 | 英飞特电子（杭州）有限公司 | Pulse-width modulation (PWM) light-adjusting circuit for light-emitting diode (LED) |
| CN201956897U (en) * | 2010-09-19 | 2011-08-31 | 石家庄国耀电子科技有限公司 | Logical link control (LLC) topology circuit output overcurrent constant current protection circuit for switching power supply |
| CN202551438U (en) * | 2012-03-28 | 2012-11-21 | 无锡安特源科技有限公司 | Light-load control structure for power source using LLC (logical link control) topology |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103945594A (en) * | 2013-01-22 | 2014-07-23 | 上海鸣志自动控制设备有限公司 | Circuit for improving scintillation problem of series half-bridge resonance light modulation |
| CN103945594B (en) * | 2013-01-22 | 2016-04-13 | 上海鸣志自动控制设备有限公司 | Improve the circuit of series half-bridge resonance light modulation flicker problem |
| CN109560706A (en) * | 2017-09-27 | 2019-04-02 | 昱京能源科技股份有限公司 | PSR current control system under LLC framework |
| CN109560706B (en) * | 2017-09-27 | 2020-08-25 | 昱京能源科技股份有限公司 | PSR current control system under LLC framework |
| CN108494256A (en) * | 2018-03-15 | 2018-09-04 | 湖北理工学院 | A kind of the LLC resonant converter underloading voltage modulation system and modulation strategy of energy feedback |
| CN108494256B (en) * | 2018-03-15 | 2020-02-14 | 湖北理工学院 | Energy feedback LLC resonant converter light-load voltage modulation system and modulation strategy |
| CN110957926A (en) * | 2019-11-22 | 2020-04-03 | 深圳南云微电子有限公司 | Light load detection and frequency reduction control method and circuit |
| TWI717247B (en) * | 2020-03-30 | 2021-01-21 | 通嘉科技股份有限公司 | Power controller and control method for llc resonant converter |
| CN113517816A (en) * | 2020-04-10 | 2021-10-19 | 通嘉科技股份有限公司 | Control method of LLC resonant converter and power supply controller |
| CN113394985A (en) * | 2021-07-21 | 2021-09-14 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, resonant converter and integrated circuit control chip |
| CN113394985B (en) * | 2021-07-21 | 2022-08-23 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, resonant converter and integrated circuit control chip |
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| CB03 | Change of inventor or designer information |
Inventor after: Xu Ruopeng Inventor before: Lin Wanhui |
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Free format text: CORRECT: INVENTOR; FROM: LIN WANHUI TO: XU RUOPENG |
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Application publication date: 20120704 |