CN105657915A - Segmented LED drive circuit based on low-voltage off mode - Google Patents
Segmented LED drive circuit based on low-voltage off mode Download PDFInfo
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- CN105657915A CN105657915A CN201610204822.0A CN201610204822A CN105657915A CN 105657915 A CN105657915 A CN 105657915A CN 201610204822 A CN201610204822 A CN 201610204822A CN 105657915 A CN105657915 A CN 105657915A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Continuous-Control Power Sources That Use Transistors (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention discloses a segmented LED drive circuit based on a low-voltage off mode. The segmented LED drive circuit comprises an error amplifier circuit OP, an under-voltage control circuit, an MOS tube M0 and a current-limiting resistor R0. According to the segmented LED drive circuit disclosed by the invention, through change of a control mechanism of the current-limiting MOS tube and reduction of the grid voltage, the MOS tube is prevented from being in an uncontrolled linear area, and the LED flickering problem caused by abrupt voltage change is effectively solved; during the input of abruptly-changed large voltage, the load current is effectively restrained, the stability of a driving system and the driven surge resistance are increased, the voltage of an LED chip in a harsh input voltage environment is reduced, the driving reliability is improved, and the product life is prolonged.
Description
Technical field
The invention belongs to electronic display technology field, particularly to a kind of method eliminating the scintillation effects such as LED.
Background technology
LED light source was used widely in novel energy-conserving light source field with its high efficiency, high integration, high life. In LED light source practical application, the LED light source drive scheme without the energy storage device such as inductance, electric capacity is widely applied, and progressively becomes main flow LED light source drive scheme. In such drive scheme, control IC by the grid voltage of LED light source channel selector metal-oxide-semiconductor being regulated the electric current controlling On current and LED light source, to make up that LED light source is non-linear and tetchiness that the On current that causes is to input voltage, thus reaching current limliting purpose.
Fig. 1 shows that a typical stagewise LED drives structure, and when input voltage is relatively low, first first paragraph LED is lit. When input voltage gradually rises, after several sections of LED lighted step by step, until final stage LED is lit. In stagewise LED actuation techniques, drive and the compatibility of controllable silicon TRIAC dimmer is the performance indications that user compares concern. Controllable silicon dimmer carrys out the illumination dimmer of regulating load power by excising the fractional phase of input AC electricity, is widely used at European & American Market with its cheap and simple. The compatibility of controllable silicon dimmer and electric filament lamp is better, but due to its front end cut characteristic, input voltage has the rising of a step in cut position. Owing to tradition LED drive circuit is when input voltage is not enough to drive first paragraph LED, all of LED controls metal-oxide-semiconductor and is at conducting state, the unexpected rising of this input voltage, causes that the switch response of load driving circuits produces a gibbs vibration. This vibration is a uncontrollable free oscillation, and by input voltage and noise effect, the vibration of different cycles causes LED load changed power. The luminous quantity in this different input cycle changes for Consumer's Experience, it it is a kind of uncontrollable low frequency flicker, this low frequency flicker is obvious especially in some light modulation position, and flicker cycle is about about 10Hz, and such low frequency flicker is unacceptable for the customer.
Summary of the invention
It is an object of the invention to: a kind of stagewise LED drive circuit based on low pressure " shut " mode" is provided, further increase the stability of drive system and the Surge handling capability driven, reduce LED chip pressure under severe input voltage environment.
The technical scheme is that a kind of stagewise LED drive circuit based on low pressure " shut " mode", it includes: error amplifying circuit OP, under-voltage control circuit, metal-oxide-semiconductor M0, current-limiting resistance R0;
Described error amplifying circuit OP passes through described current-limiting resistance R0, gathers the drain voltage of described metal-oxide-semiconductor M0, and carries out differential amplification with reference voltage Vref, provides voltage to the grid of described metal-oxide-semiconductor M0;
Described under-voltage control circuit coordinates with described error amplifying circuit OP, when described metal-oxide-semiconductor M0 is in linear condition, continues to reduce the grid voltage of described metal-oxide-semiconductor M0, the state until described metal-oxide-semiconductor M0 reaches capacity.
A kind of stagewise LED drive circuit based on low pressure " shut " mode", it includes: error amplifying circuit OP1, error amplifying circuit OP2, metal-oxide-semiconductor M0, current-limiting resistance R0, divider resistance R1, divider resistance R2;
Described error amplifying circuit OP1, described error amplifying circuit OP2, described current-limiting resistance R0, described divider resistance R1, described divider resistance R2, for detecting described metal-oxide-semiconductor M0 drain current, when described metal-oxide-semiconductor M0 is in linear condition, continue to reduce the drain current of described metal-oxide-semiconductor M0, the state until described metal-oxide-semiconductor M0 reaches capacity.
A kind of stagewise LED drive circuit based on low pressure " shut " mode", it includes: error amplifying circuit OP1, error amplifying circuit OP2, under-voltage control circuit, metal-oxide-semiconductor M0, current-limiting resistance R0, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, for detecting input voltage, when described metal-oxide-semiconductor M0 is in linear condition, continue to reduce the grid voltage of described metal-oxide-semiconductor M0, the state until described metal-oxide-semiconductor M0 reaches capacity.
A kind of stagewise LED drive circuit based on low pressure " shut " mode", it includes: error amplifying circuit OP, delay circuit, metal-oxide-semiconductor M0, current-limiting resistance R0;
Described error amplifying circuit OP passes through described current-limiting resistance R0, gathers the drain voltage of described metal-oxide-semiconductor M0, and carries out differential amplification with reference voltage Vref, provides voltage to the grid of described metal-oxide-semiconductor M0;
Described delay circuit is placed in described error amplifying circuit OP prime, for increasing the grid voltage rise time, steady load electric current, when described metal-oxide-semiconductor M0 is in linear condition, continue to reduce the grid voltage of described metal-oxide-semiconductor M0, the state until described metal-oxide-semiconductor M0 reaches capacity.
The present invention utilizes suppression controllable silicon cut position voltage to raise suddenly the current oscillation caused to eliminate the scintillation effect of LED, when driving input voltage relatively low, reduces mos gate pole tension, until metal-oxide-semiconductor is in saturated or closed mode; Control gate voltage is carried out, it is achieved reduce grid voltage at low input by detecting metal-oxide-semiconductor drain voltage; Control gate voltage is carried out, to realize reducing grid voltage at low input by detecting metal-oxide-semiconductor source current; Control gate voltage is carried out, to realize reducing grid voltage at low input by detecting input voltage; Pass through delay circuit, the increase grid voltage rise time further suppress the vibration of LED load electric current, further increase the stability of drive system, and the Surge handling capability driven, reduce LED chip pressure under severe input voltage environment, add driving reliability and life of product.
Accompanying drawing explanation
Fig. 1 is that typical stagewise LED drives structure;
Fig. 2 is by detecting drain voltage, the present invention judges whether metal-oxide-semiconductor is operated in the circuit theory diagrams of the range of linearity;
Fig. 3 is by detecting source electric current, the present invention judges whether metal-oxide-semiconductor is operated in the circuit theory diagrams of the range of linearity;
Fig. 4 is by detecting input voltage, the present invention judges whether metal-oxide-semiconductor is operated in the circuit theory diagrams of the range of linearity;
Fig. 5 is that the present invention prevents LED current generation oscillating circuit schematic diagram by increasing delay circuit.
Detailed description of the invention
Embodiment 1: participating in Fig. 2, a kind of stagewise LED drive circuit based on low pressure " shut " mode", it includes: error amplifying circuit OP, under-voltage control circuit, metal-oxide-semiconductor M0, current-limiting resistance R0;
Described error amplifying circuit OP passes through described current-limiting resistance R0, gathers the drain voltage of described metal-oxide-semiconductor M0, and carries out differential amplification with reference voltage Vref, provides voltage to the grid of described metal-oxide-semiconductor M0;
Described under-voltage control circuit coordinates with described error amplifying circuit OP, when described metal-oxide-semiconductor M0 is in linear condition, continues to reduce the grid voltage of described metal-oxide-semiconductor M0, the state until described metal-oxide-semiconductor M0 reaches capacity.
Embodiment 2: participating in Fig. 3, a kind of stagewise LED drive circuit based on low pressure " shut " mode", it includes: error amplifying circuit OP1, error amplifying circuit OP2, metal-oxide-semiconductor M0, current-limiting resistance R0, divider resistance R1, divider resistance R2;
Described error amplifying circuit OP1, described error amplifying circuit OP2, described current-limiting resistance R0, described divider resistance R1, described divider resistance R2, for detecting described metal-oxide-semiconductor M0 drain current, when described metal-oxide-semiconductor M0 is in linear condition, continue to reduce the drain current of described metal-oxide-semiconductor M0, the state until described metal-oxide-semiconductor M0 reaches capacity.
Embodiment 3: participate in Fig. 4, a kind of stagewise LED drive circuit based on low pressure " shut " mode", it includes: error amplifying circuit OP1, error amplifying circuit OP2, under-voltage control circuit, metal-oxide-semiconductor M0, current-limiting resistance R0, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, for detecting input voltage, when described metal-oxide-semiconductor M0 is in linear condition, continue to reduce the grid voltage of described metal-oxide-semiconductor M0, the state until described metal-oxide-semiconductor M0 reaches capacity.
Embodiment 4: participating in Fig. 5, a kind of stagewise LED drive circuit based on low pressure " shut " mode", it includes: error amplifying circuit OP, delay circuit, metal-oxide-semiconductor M0, current-limiting resistance R0;
Described error amplifying circuit OP passes through described current-limiting resistance R0, gathers the drain voltage of described metal-oxide-semiconductor M0, and carries out differential amplification with reference voltage Vref, provides voltage to the grid of described metal-oxide-semiconductor M0;
Described delay circuit is placed in described error amplifying circuit OP prime, for increasing the grid voltage rise time, steady load electric current, when described metal-oxide-semiconductor M0 is in linear condition, continue to reduce the grid voltage of described metal-oxide-semiconductor M0, the state until described metal-oxide-semiconductor M0 reaches capacity.
Claims (4)
1. the stagewise LED drive circuit based on low pressure " shut " mode", it is characterised in that it includes: error amplifying circuit OP, under-voltage control circuit, metal-oxide-semiconductor M0, current-limiting resistance R0;
Described error amplifying circuit OP passes through described current-limiting resistance R0, gathers the drain voltage of described metal-oxide-semiconductor M0, and carries out differential amplification with reference voltage Vref, provides voltage to the grid of described metal-oxide-semiconductor M0;
Described under-voltage control circuit coordinates with described error amplifying circuit OP, when described metal-oxide-semiconductor M0 is in linear condition, continues to reduce the grid voltage of described metal-oxide-semiconductor M0, the state until described metal-oxide-semiconductor M0 reaches capacity.
2. the stagewise LED drive circuit based on low pressure " shut " mode", it is characterised in that it includes: error amplifying circuit OP1, error amplifying circuit OP2, metal-oxide-semiconductor M0, current-limiting resistance R0, divider resistance R1, divider resistance R2;
Described error amplifying circuit OP1, described error amplifying circuit OP2, described current-limiting resistance R0, described divider resistance R1, described divider resistance R2, for detecting described metal-oxide-semiconductor M0 drain current, when described metal-oxide-semiconductor M0 is in linear condition, continue to reduce the drain current of described metal-oxide-semiconductor M0, the state until described metal-oxide-semiconductor M0 reaches capacity.
3. the stagewise LED drive circuit based on low pressure " shut " mode", it is characterized in that, it includes: error amplifying circuit OP1, error amplifying circuit OP2, under-voltage control circuit, metal-oxide-semiconductor M0, current-limiting resistance R0, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, for detecting input voltage, when described metal-oxide-semiconductor M0 is in linear condition, continue to reduce the grid voltage of described metal-oxide-semiconductor M0, the state until described metal-oxide-semiconductor M0 reaches capacity.
4. the stagewise LED drive circuit based on low pressure " shut " mode", it is characterised in that it includes: error amplifying circuit OP, delay circuit, metal-oxide-semiconductor M0, current-limiting resistance R0;
Described error amplifying circuit OP passes through described current-limiting resistance R0, gathers the drain voltage of described metal-oxide-semiconductor M0, and carries out differential amplification with reference voltage Vref, provides voltage to the grid of described metal-oxide-semiconductor M0;
Described delay circuit is placed in described error amplifying circuit OP prime, for increasing the grid voltage rise time, steady load electric current, when described metal-oxide-semiconductor M0 is in linear condition, continue to reduce the grid voltage of described metal-oxide-semiconductor M0, the state until described metal-oxide-semiconductor M0 reaches capacity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610204822.0A CN105657915B (en) | 2016-04-05 | 2016-04-05 | A kind of segmented LED drive circuit based on low pressure close pattern |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610204822.0A CN105657915B (en) | 2016-04-05 | 2016-04-05 | A kind of segmented LED drive circuit based on low pressure close pattern |
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| CN105657915A true CN105657915A (en) | 2016-06-08 |
| CN105657915B CN105657915B (en) | 2017-12-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109831092A (en) * | 2019-02-28 | 2019-05-31 | 杭州芯声智能科技有限公司 | A kind of current-limiting circuit |
Citations (5)
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| JP2005116616A (en) * | 2003-10-03 | 2005-04-28 | Toshiba Corp | Led drive circuit and led drive system |
| CN203884027U (en) * | 2014-03-21 | 2014-10-15 | 武汉精测电子技术股份有限公司 | LED constant current driving circuit for multipath adaptive load |
| CN104968103A (en) * | 2015-06-26 | 2015-10-07 | 易美芯光（北京）科技有限公司 | Resistance current repressing circuit used for LED sectional drive |
| CN105373180A (en) * | 2015-09-16 | 2016-03-02 | 西安拓尔微电子有限责任公司 | Low power consumption low dropout linear regulator |
| CN205430706U (en) * | 2016-04-05 | 2016-08-03 | 易美芯光（北京）科技有限公司 | Sectional type LED drive circuit based on low pressure mode of closing |
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- 2016-04-05 CN CN201610204822.0A patent/CN105657915B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005116616A (en) * | 2003-10-03 | 2005-04-28 | Toshiba Corp | Led drive circuit and led drive system |
| CN203884027U (en) * | 2014-03-21 | 2014-10-15 | 武汉精测电子技术股份有限公司 | LED constant current driving circuit for multipath adaptive load |
| CN104968103A (en) * | 2015-06-26 | 2015-10-07 | 易美芯光（北京）科技有限公司 | Resistance current repressing circuit used for LED sectional drive |
| CN105373180A (en) * | 2015-09-16 | 2016-03-02 | 西安拓尔微电子有限责任公司 | Low power consumption low dropout linear regulator |
| CN205430706U (en) * | 2016-04-05 | 2016-08-03 | 易美芯光（北京）科技有限公司 | Sectional type LED drive circuit based on low pressure mode of closing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109831092A (en) * | 2019-02-28 | 2019-05-31 | 杭州芯声智能科技有限公司 | A kind of current-limiting circuit |
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Denomination of invention: Segmented LED drive circuit based on low-voltage off mode Effective date of registration: 20190923 Granted publication date: 20171205 Pledgee: Zhongguancun Beijing technology financing Company limited by guarantee Pledgor: SHINEON (BEIJING) TECHNOLOGY Co.,Ltd. Registration number: Y2019990000271 |
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Date of cancellation: 20220927 Granted publication date: 20171205 Pledgee: Zhongguancun Beijing technology financing Company limited by guarantee Pledgor: SHINEON (BEIJING) TECHNOLOGY Co.,Ltd. Registration number: Y2019990000271 |
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