CN105407604A - Boost LED drive circuit - Google Patents
Boost LED drive circuit Download PDFInfo
- Publication number
- CN105407604A CN105407604A CN201510823050.4A CN201510823050A CN105407604A CN 105407604 A CN105407604 A CN 105407604A CN 201510823050 A CN201510823050 A CN 201510823050A CN 105407604 A CN105407604 A CN 105407604A
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- China
- Prior art keywords
- drive circuit
- led drive
- module
- voltage reference
- type led
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Abstract
The invention discloses a boost LED drive circuit. A starting tube M2 is added to a voltage reference module; a gate bias of the starting tube M2 is from a current reference source; when a system normally works, the current reference source works in priority, and then the starting tube M2 is conducted, so that an operational amplifier clamping branch is injected with a current in advance when a voltage reference circuit reaches a normal working point; and normal working voltages are quickly built at two ends of an operational amplifier; the system compensation is I-type compensation; the compensating capacitance is 200pF; and the operational amplifier needs relatively high loading capacity. Due to the constituents of a bipolar operational transconductance amplifier, the boost LED drive circuit has the characteristics of high output impedance, wide transmission band bandwidth and good high-frequency characteristics; symmetrical layout of the domain is facilitated; and the effects of an offset voltage are reduced. A capacitor C2 is added to a PWM dimming module, so that the condition that the current on the capacitor is not released completely when the next charging sequence of the capacitor comes is ensured; the starting process is omitted; and the boost LED drive circuit has high application value.
Description
Technical field
The present invention relates to and belong to LED circuit field, be specifically related to a kind of booster type LED drive circuit.
Background technology
LED is made up of a PN junction, and when forward bias voltage is greater than cut-in voltage, produce spontaneous radiation fluorescence, emittance is stronger, and the wavelength launched is shorter, otherwise then wavelength is longer.As now widely used backlight, the advantage of LED is also suitable obvious, and the harmful substances such as main advantage has: (1) environmental protection: adopt semiconductor technology luminous, not mercurous meet current whole world ecological requirements; (2) low-power consumption, more than 100lm/W luminous efficiency, power consumption can reduce by more than 30%.Adopt dynamic local light regulating technology, power consumption can be reduced further; (3) long-life: working life reaches 100,000 hours.(4) good optical properties, good colour gamut and contrast; (4) fail safe is high: the driving voltage only needing more than 3V, fast response and settling time; (5) sturdy and durable: to adopt solidification encapsulation, vibration resistance.Current LED constant current backlight drive circuit also exists poor stability and inefficient problem.
Summary of the invention
The object of the present invention is to provide a kind of booster type LED drive circuit.
For achieving the above object, the invention provides following technical scheme: a kind of booster type LED drive circuit, described drive circuit comprises voltage reference module, error amplifier block and PWM light-adjusting module, described voltage reference module can produce one and have nothing to do with power-supply fluctuation, the voltage very little with temperature coefficient relation, described error amplifier block is connected with voltage reference module, described error amplifier block comprises biasing circuit and folded common source and common grid amplifier, described biasing circuit respectively manages suitable static working current for amplifier main part, described folded common source and common grid amplifier " shielding " entering apparatus makes it not by the impact of output node change in voltage, described PWM light-adjusting module is connected with error amplifier block, described PWM light-adjusting module is by the difference of duty cycle square wave, obtain the LED of different brightness.
Preferably, startup pipe M is added in described voltage reference module
2, start pipe M
2gate bias derive from current reference source.
Preferably, in described voltage reference module, the ratio of two triodes is 1:24.
Preferably, in described error amplifier block, common-source output is set.
Preferably, what described error amplification module adopted is ambipolar operational transconductance amplifier.
Preferably, electric capacity C is added in described PWM light-adjusting module
2.
Adopt the beneficial effect of above technical scheme to be: to the invention provides a kind of booster type LED drive circuit, add in described voltage reference module and start pipe M
2, start pipe M
2gate bias derive from current reference source, during system worked well, current reference by priority task, then M
2pipe conducting, thus when voltage reference circuit reaches normal working point in advance to amplifier clamper branch road Injection Current, amplifier two ends are made to set up normal operating voltage fast, in described voltage reference module, the ratio of two triodes is 1:24, in described error amplifier block, common-source output is set, system balance is that I type compensates, building-out capacitor is 200pF, therefore amplifier needs stronger load capacity, so additionally add the output stage of one-level high current drive capability, what described error amplification module adopted is ambipolar operational transconductance amplifier, it is high that the composition of described ambipolar operational transconductance amplifier makes it have output impedance, the feature that passband band is wide and high frequency characteristics is good, facilitate the symmetric layout of domain, and reduce the impact of offset voltage, electric capacity C is added in described PWM light-adjusting module
2, when ensureing once to charge sequential arrival on electric capacity, the electric current on it is not released complete, eliminates start-up course, has very high using value.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of embodiments of the invention.
Fig. 2 is the circuit diagram of PWM light-adjusting module.
Embodiment
The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
embodiment
A kind of booster type LED drive circuit, described drive circuit comprises voltage reference module, error amplifier block and PWM light-adjusting module, described voltage reference module can produce one and have nothing to do with power-supply fluctuation, the voltage very little with temperature coefficient relation, described error amplifier block is connected with voltage reference module, described error amplifier block comprises biasing circuit and folded common source and common grid amplifier, described biasing circuit respectively manages suitable static working current for amplifier main part, described folded common source and common grid amplifier " shielding " entering apparatus makes it not by the impact of output node change in voltage, described PWM light-adjusting module is connected with error amplifier block, described PWM light-adjusting module is by the difference of duty cycle square wave, obtain the LED of different brightness.
Add in described voltage reference module and start pipe M
2, start pipe M
2gate bias derive from current reference source, in described voltage reference module, the ratio of two triodes is 1:24, arrange common-source output in described error amplifier block, what described error amplification module adopted is ambipolar operational transconductance amplifier, adds electric capacity C in described PWM light-adjusting module
2.
The operation principle of PWM comparator module: when pwm signal holds input circuit I through EN, is converted into ENA and likelihood signal and PWMD signal.Wherein ENA signal is lasting high level, carries out enable to internal circuit; PWMD signal is the signal all identical with EN frequency, duty ratio, and this signal is through circuit I I, and the amplitude that 200mV reference signal converted to is 200mV, the pwm signal that frequency, duty ratio are identical with PWMD.So namely the duty ratio changing EN signal changes the duty ratio of EA reference data, after the adjustment of loop, the average current of output can be changed.
The invention provides a kind of booster type LED drive circuit, add in described voltage reference module and start pipe M
2, start pipe M
2gate bias derive from current reference source, during system worked well, current reference by priority task, then M
2pipe conducting, thus when voltage reference circuit reaches normal working point in advance to amplifier clamper branch road Injection Current, amplifier two ends are made to set up normal operating voltage fast, in described voltage reference module, the ratio of two triodes is 1:24, in described error amplifier block, common-source output is set, system balance is that I type compensates, building-out capacitor is 200pF, therefore amplifier needs stronger load capacity, so additionally add the output stage of one-level high current drive capability, what described error amplification module adopted is ambipolar operational transconductance amplifier, it is high that the composition of described ambipolar operational transconductance amplifier makes it have output impedance, the feature that passband band is wide and high frequency characteristics is good, facilitate the symmetric layout of domain, and reduce the impact of offset voltage, electric capacity C is added in described PWM light-adjusting module
2, when ensureing once to charge sequential arrival on electric capacity, the electric current on it is not released complete, eliminates start-up course, has very high using value.
As known by the technical knowledge, the present invention can be realized by other the embodiment not departing from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment, with regard to each side, all just illustrates, is not only.Within the scope of the present invention all or be all included in the invention being equal to the change in scope of the present invention.
Claims (6)
1. a booster type LED drive circuit, it is characterized in that, described drive circuit comprises voltage reference module, error amplifier block and PWM light-adjusting module, described voltage reference module can produce one and have nothing to do with power-supply fluctuation, the voltage very little with temperature coefficient relation, described error amplifier block is connected with voltage reference module, described error amplifier block comprises biasing circuit and folded common source and common grid amplifier, described biasing circuit respectively manages suitable static working current for amplifier main part, described folded common source and common grid amplifier " shielding " entering apparatus makes it not by the impact of output node change in voltage, described PWM light-adjusting module is connected with error amplifier block, described PWM light-adjusting module is by the difference of duty cycle square wave, obtain the LED of different brightness.
2. a kind of booster type LED drive circuit according to claim 1, is characterized in that: add in described voltage reference module and start pipe M
2, start pipe M
2gate bias derive from current reference source.
3. a kind of booster type LED drive circuit according to claim 2, is characterized in that: in described voltage reference module, the ratio of two triodes is 1:24.
4. a kind of booster type LED drive circuit according to claim 1, is characterized in that: arrange common-source output in described error amplifier block.
5. according to claim 1 a kind of booster type LED drive circuit, what described error amplification module adopted is ambipolar operational transconductance amplifier.
6. a kind of booster type LED drive circuit according to claim 1, adds electric capacity C in described PWM light-adjusting module
2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510823050.4A CN105407604A (en) | 2015-11-24 | 2015-11-24 | Boost LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510823050.4A CN105407604A (en) | 2015-11-24 | 2015-11-24 | Boost LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105407604A true CN105407604A (en) | 2016-03-16 |
Family
ID=55472779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510823050.4A Pending CN105407604A (en) | 2015-11-24 | 2015-11-24 | Boost LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105407604A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617413A (en) * | 2019-01-30 | 2019-04-12 | 上海艾为电子技术股份有限公司 | Boost chip and its mode switching circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929860A (en) * | 2014-04-29 | 2014-07-16 | 武汉大学 | Dimmable LED driver chip provided with soft start and under-voltage lock-out circuits |
| US20140286645A1 (en) * | 2011-11-22 | 2014-09-25 | Panasonic Corporation | Lighting fixture and visible-light-communication system with same |
-
2015
- 2015-11-24 CN CN201510823050.4A patent/CN105407604A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140286645A1 (en) * | 2011-11-22 | 2014-09-25 | Panasonic Corporation | Lighting fixture and visible-light-communication system with same |
| CN103929860A (en) * | 2014-04-29 | 2014-07-16 | 武汉大学 | Dimmable LED driver chip provided with soft start and under-voltage lock-out circuits |
Non-Patent Citations (1)
| Title |
|---|
| 徐飞: "带有宽频PWM调光范围的高效升压型白光LED驱动的设计", 《中国优秀硕士学位论文全文数据库》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617413A (en) * | 2019-01-30 | 2019-04-12 | 上海艾为电子技术股份有限公司 | Boost chip and its mode switching circuit |
| CN109617413B (en) * | 2019-01-30 | 2024-03-01 | 上海艾为电子技术股份有限公司 | Boost chip and mode switching circuit thereof |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160316 |