CN104470091B - Low-power current self-locking LED controller - Google Patents
Low-power current self-locking LED controller Download PDFInfo
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- CN104470091B CN104470091B CN201410677579.5A CN201410677579A CN104470091B CN 104470091 B CN104470091 B CN 104470091B CN 201410677579 A CN201410677579 A CN 201410677579A CN 104470091 B CN104470091 B CN 104470091B
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Abstract
The invention discloses a low-power current self-locking LED controller which comprises a rectifier bridge, resistors, a capacitor C1, diodes, an audion, a constant-current control unit, a voltage sampling unit, a voltage polarization unit, switches and an LED lamp string. The input end of the voltage sampling unit is connected with the output end of the rectifier bridge. The voltage sampling unit samples input voltage. The switch K101 carries out connecting motion and disconnecting motion according to output of the voltage sampling unit. The switch K102 carries out connecting motion and disconnecting motion according to a voltage value on the resistor R4 and output of the voltage sampling unit. The low-power current self-locking LED controller has the automatic locking function, LED lamp beads can work all the time, and the utilization rate is high; the capacitor stores energy and supplies power, and ripples and flicker are avoided; the capacitor bears extra voltage, and then power consumption is reduced; a logical judgment method of a current and voltage method adapts to changes of input voltage automatically, efficiency is high, and the method adapts to the changes of the input voltage within a certain range; integration is achieved, and therefore the size and the cost are reduced greatly.
Description
Technical field
The present invention relates to a kind of LED drive device, particularly relate to a kind of low power current self-locking LED controller.
Background technology
LED drives current art mainly to have following three kinds: one to be resistance-capacitance circuit type, and shortcoming is that constant current accuracy is the highest, is only applicable to
Below 5W；Moderate dimensions but poor reliability, easily occur complete machine to burn；Advantage is that low cost, efficiency are up to about 95%.Two are
Type switching power, advantage is that constant current accuracy is high, can wide scope work；Shortcoming is that cost is high, efficiency is higher, EMI is serious, stricture of vagina
Ripple is big, size is big.Three is piecewise linearity type, although constant current accuracy is high, and size is little, but is not suitable for certain electricity as capacitance-resistance
Pressure scope works；Although moderate cost, efficiency are low, ripple is little, but lamp bead utilization rate is low.
Summary of the invention
The technical problem to be solved is to provide a kind of low power current self-locking LED control for above-mentioned the deficiencies in the prior art
Device processed, low power current self-locking LED controller ripple-free；Low EMI；Efficiency moderate (> 75%), it is adaptable to below 5W；Real
Now univoltage input range, PF > 0.5, device are few, miniaturization, integrability, cost are extremely low.
For solving above-mentioned technical problem, the technical scheme that the present invention takes is: low power current self-locking LED controller, its characteristic
Be: include rectifier bridge, resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, diode D1, diode D2,
Diode D3, audion, constant-current control unit, voltage sampling unit, voltage bias unit, switch K101, switch k 102
With LED string；Described voltage bias unit is for providing bias voltage to audion；Voltage bias unit and resistance R1, switch
The base stage of K101 and audion is sequentially connected in series；Voltage bias unit also base stage with resistance R2 and audion is sequentially connected in series；
Voltage bias unit also colelctor electrode with resistance R3 and audion is sequentially connected in series；LED string one end connects with the outfan of rectifier bridge
Connecing, the other end is connected with constant-current control unit；The other end of constant-current control unit is connected with diode D2 anode, diode D2
Negative electrode and electric capacity C1 and resistance R4 are sequentially connected in series rear ground connection；Diode D1 anode is connected with diode D2 negative electrode, diode
D1 negative electrode is connected with the outfan of rectifier bridge；Diode D3 anode is connected with the base stage of audion, and diode D3 negative electrode is connected to
The near end of electric capacity C1, and junction point is between electric capacity C1 and resistance R4；Switch K102 one end and diode D2 anode
Connecting, the other end is connected with transistor emitter, and transistor emitter is with resistance R4 altogether；
Described constant-current control unit is used for controlling LED current；Described voltage bias unit is for providing bias voltage to audion；
The input of voltage sampling unit is connected with the outfan of rectifier bridge, and voltage sampling unit is used for sampled input voltage, switchs K 101
Output according to voltage sampling unit carries out the action turning on and disconnecting；Switch K 102 is according to the magnitude of voltage on resistance R4 and voltage
The output of sampling unit carries out the action turning on and disconnecting.
As the technical scheme of the present invention this machine further, also including diode D4, diode D4 anode is with transistor emitter even
Connect, diode D4 negative electrode with switch K102 near end be connected after with resistance R4 altogether.
As the technical scheme of the present invention this machine further, also include diode D5, diode D5 anode and diode D4 negative electrode
Connect, diode D5 negative electrode with switch K102 near end be connected after with resistance R4 altogether.
As the technical scheme of the present invention this machine further, also include diode D6, diode D6 anode and switch K102 near-earth
End connects, and diode D6 negative electrode is with resistance R4 altogether.
Present invention employs the current loop detection means of uniqueness, this measure loop has automatic self-locking function；And LED lamp bead
Can work all the time, utilization rate is high；Capacitance energy storage is powered, ripple-free, flicker free；The voltage that electric capacity carrying is extra, enters one
Step reduces power consumption；The logical judgment method of electric current+voltage method, makes adaptive input change in voltage, and efficiency is high, adapts to input voltage
A range of change；Integrability is substantially reduced size and cost.
Accompanying drawing explanation
Fig. 1 be do inventive embodiments 1 realize theory diagram.
Fig. 2 be do inventive embodiments 2 realize theory diagram.
Fig. 3 be do inventive embodiments 3 realize theory diagram.
Fig. 4 be do inventive embodiments 4 realize theory diagram.
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described further.
Detailed description of the invention
Embodiment 1
Seeing Fig. 1, this low power current self-locking LED controller includes rectifier bridge, resistance R1, resistance R2, resistance R3, resistance
R4, electric capacity C1, diode D1, diode D2, diode D3, audion, constant-current control unit, voltage sampling unit,
Voltage bias unit, switch K101, switch k 102 and LED string；Described voltage bias unit is for providing partially to audion
Put voltage；Voltage bias unit is sequentially connected in series with the base stage of resistance R1, switch K101 and audion；Voltage bias unit is also
It is sequentially connected in series with the base stage of resistance R2 and audion；Voltage bias unit is also with the colelctor electrode of resistance R3 and audion successively
Series connection；LED string one end is connected with the outfan of rectifier bridge, and the other end is connected with constant-current control unit；Constant-current control unit
The other end is connected with diode D2 anode, and diode D2 negative electrode and electric capacity C1 and resistance R4 are sequentially connected in series rear ground connection；Two poles
Pipe D1 anode is connected with diode D2 negative electrode, and diode D1 negative electrode is connected with the outfan of rectifier bridge；Diode D3 anode with
The base stage of audion connects, and diode D3 negative electrode is connected to the near end of electric capacity C1, and junction point is positioned at electric capacity C1 and resistance
Between R4；Switch K102 one end is connected with diode D2 anode, and the other end is connected with transistor emitter, transistor emitter
With resistance R4 altogether；
Described constant-current control unit is used for controlling LED current；Described voltage bias unit is for providing bias voltage to audion；
The input of voltage sampling unit is connected with the outfan of rectifier bridge, and voltage sampling unit is used for sampled input voltage, switchs K 101
Output according to voltage sampling unit carries out the action turning on and disconnecting；Switch K 102 is according to the magnitude of voltage on resistance R4 and voltage
The output of sampling unit carries out the action turning on and disconnecting.
Embodiment 2
This low power current self-locking LED controller also includes that diode D4, diode D4 anode are connected with transistor emitter, two
Pole pipe D4 negative electrode with switch K102 near end be connected after with resistance R4 altogether.Other parts of the present embodiment 2 and embodiment 1 phase
With, no longer state.
Embodiment 3
This low power current self-locking LED controller also includes that diode D5, diode D5 anode are connected with diode D4 negative electrode,
Diode D5 negative electrode with switch K102 near end be connected after with resistance R4 altogether.Other parts of the present embodiment 3 and embodiment 2
Identical, no longer state.
Embodiment 4
This low power current self-locking LED controller also includes that diode D6, diode D6 anode are connected with switch K102 near end,
Diode D6 negative electrode is with resistance R4 altogether.Other parts of the present embodiment 4 are same as in Example 1, no longer state.
Claims (4)
1. a low power current self-locking LED controller, it is characterised in that: include rectifier bridge, resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, diode D1, diode D2, diode D3, audion, constant-current control unit, voltage sampling unit, voltage bias unit, switch K101, switch k 102 and LED string；Described voltage bias unit is for providing bias voltage to audion；Voltage bias unit is sequentially connected in series with the base stage of resistance R1, switch K101 and audion；Voltage bias unit also base stage with resistance R2 and audion is sequentially connected in series；Voltage bias unit also colelctor electrode with resistance R3 and audion is sequentially connected in series；LED string one end is connected with the outfan of rectifier bridge, and the other end is connected with constant-current control unit；The other end of constant-current control unit is connected with diode D2 anode, and diode D2 negative electrode and electric capacity C1 and resistance R4 are sequentially connected in series rear ground connection；Diode D1 anode is connected with diode D2 negative electrode, and diode D1 negative electrode is connected with the outfan of rectifier bridge；Diode D3 anode is connected with the base stage of audion, and diode D3 negative electrode is connected to the near end of electric capacity C1, and junction point is between electric capacity C1 and resistance R4；Switch K102 one end is connected with diode D2 anode, and the other end is connected with transistor emitter, and transistor emitter is with resistance R4 altogether；
Described constant-current control unit is used for controlling LED current；Described voltage bias unit is for providing bias voltage to audion；The input of voltage sampling unit is connected with the outfan of rectifier bridge, and voltage sampling unit is used for sampled input voltage, and switch K 101 carries out the action turning on and disconnecting according to the output of voltage sampling unit；Switch K 102 carries out the action turning on and disconnecting according to the output of the magnitude of voltage on resistance R4 and voltage sampling unit.
Low power current self-locking LED controller the most according to claim 1, it is characterised in that: also include that diode D4, diode D4 anode are connected with transistor emitter, diode D4 negative electrode with switch K102 near end be connected after with resistance R4 altogether.
Low power current self-locking LED controller the most according to claim 2, it is characterised in that: also include that diode D5, diode D5 anode are connected with diode D4 negative electrode, diode D5 negative electrode with switch K102 near end be connected after with resistance R4 altogether.
Low power current self-locking LED controller the most according to claim 1, it is characterised in that: also including that diode D6, diode D6 anode are connected with switch K102 near end, diode D6 negative electrode is with resistance R4 altogether.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410677579.5A CN104470091B (en) | 2014-11-21 | 2014-11-21 | Low-power current self-locking LED controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410677579.5A CN104470091B (en) | 2014-11-21 | 2014-11-21 | Low-power current self-locking LED controller |
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| CN104470091A CN104470091A (en) | 2015-03-25 |
| CN104470091B true CN104470091B (en) | 2017-01-11 |
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| CN108377598A (en) * | 2018-04-27 | 2018-08-07 | 北京新能源汽车股份有限公司 | LED lamp and LED drive circuit |
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| CN101909394B (en) * | 2010-09-02 | 2015-06-03 | Bcd半导体制造有限公司 | Drive circuit and method of dimming LED lamp |
| CN201967183U (en) * | 2010-10-22 | 2011-09-07 | 英飞特电子（杭州）有限公司 | LED multi-way output current-sharing circuit |
| KR101822067B1 (en) * | 2010-10-28 | 2018-03-08 | 페어차일드코리아반도체 주식회사 | Led emitting device |
| TWM405530U (en) * | 2010-12-24 | 2011-06-11 | Li-Wen Mao | Array-type constant current multiple-driving circuit |
| CN202127534U (en) * | 2011-06-27 | 2012-01-25 | 广东工业大学 | Light-emitting diode (LED) linear constant current control circuit based on discrete component |
| CN203233572U (en) * | 2013-03-19 | 2013-10-09 | 深圳市明微电子股份有限公司 | High power factor LED linearity constant current driving controller and LED driving device |
| US8847501B1 (en) * | 2013-04-23 | 2014-09-30 | Vastview Technology Inc. | Apparatus for driving LEDs using high voltage |
| CN203423834U (en) * | 2013-09-12 | 2014-02-05 | 杭州士兰微电子股份有限公司 | LED drive circuit and transconductance amplifier thereof. |
| CN203691705U (en) * | 2014-01-09 | 2014-07-02 | 广东极佳光电科技有限公司 | LED intelligent switch control circuit |
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