CN104105250A - Direct-current low-voltage power supply injection-locking light emitting diode (LED) array lamp - Google Patents

Direct-current low-voltage power supply injection-locking light emitting diode (LED) array lamp Download PDF

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CN104105250A
CN104105250A CN201310155135.0A CN201310155135A CN104105250A CN 104105250 A CN104105250 A CN 104105250A CN 201310155135 A CN201310155135 A CN 201310155135A CN 104105250 A CN104105250 A CN 104105250A
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inductance
resistance
transformer
power
push
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CN201310155135.0A
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阮树成
阮小青
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Abstract

The invention relates to the technical field of electric light source illumination and specifically discloses a direct-current low-voltage power supply injection-locking light emitting diode (LED) array lamp. The LED array lamp comprises an LED array lamp, a direct-current low-voltage power supply, a reference crystal oscillator, an oscillation driving chip, a push-pull amplifier, a push-pull oscillator, an addition coupler, a full-wave rectifier circuit, and a lamp tube abnormal current detector. The output of the oscillation driving chip is connected with the push-pull amplifier. A transformer T1 and a push-pull oscillator transformer T3 are fed into the addition coupler in a reverse-phase way for power synthesis. The synthesized power is accessed to the lamp tube through the full-wave rectifier circuit. Signals of the reference crystal oscillator are injected into an RC oscillator of the oscillation driving chip through a frequency divider for phase locking. After power synthesis of the push-pull amplifier transformer T1 and the push-pull oscillator transformer T3, a cross-coupling injection-locking frequency pulls a coherent synchronous locking phase to achieve large-power illumination. Excessive temperature rise of the device, changes of oscillation frequency, imbalanced power and dim light are avoided. The light emitting diode LED array lamp is suitably used in commercial decoration advertisements as a large-power light emitting diode LED array lamp powered by a direct-current low-voltage heavy-current power supply.

Description

DC low voltage power supply note lock LED array lamp
Technical field
The present invention relates to electric source lighting technical field, specifically a kind of DC low voltage power supply note lock LED array lamp.
Background technology
Prior art conventionally with LC or RC oscillator as LED array lamp electric light source, the frequency of oscillation producing is declined by the poor unstable light intensity of power that affects of temperature change stability, especially DC power supply is operated in low-voltage, large electric current, although features simple structure, cost is low.Because supply voltage is low, high-power illumination be obtained and device current certainly will be increased, cause the too high frequency of oscillation that causes of hunting power pipe power consumption sharp increase temperature rise to change, result can make light unbalance with frequency change power magnitude.Meanwhile, large electric current declines by the high magnetic permeability of coil temperature rise, the little impedance trend zero of saturation inductors quantitative change, light fixture operating time and temperature rise direct ratio, device aging is accelerated in temperature rise, and gently the unstable brightness of lamp luminescence declines, heavy burn out device reduction of service life.The two synthetic LED array lamps that drag of vibration inverter power that push away of Granted publication CN202004654U, solve the restriction of device power capacity.But, the synthetic oscillating voltage phase place of a widow power consistent, overcome non-linear intermodulation power unbalanced.
Summary of the invention
The object of this invention is to provide the power supply of the large electric current of DC low-voltage, the inversion phase locked a kind of DC low voltage power supply note lock LED array lamp of high frequency stabilization that vibrates.
The technology of the present invention solution is: comprise DC low voltage power supply, LED array fluorescent tube, benchmark crystal oscillator, frequency divider, vibration drives chip, push-pull amplifier, pusb pull oscilator, be added coupler, full-wave rectifying circuit, abnormal condition of lamp tube current detector, wherein, benchmark crystal oscillator is by quartz-crystal resonator, two inverters and resistance, electric capacity forms, first inverter input and output two ends cross-over connection biasing resistor, and respectively and connect ground capacity, simultaneously, the quartz-crystal resonator of cross-over connection series connection trimmer also, benchmark crystal oscillator output signal is through second inverter access frequency divider, vibration drives chip to include RC oscillator, recommend amplification driving circuit, current detecting CS, lamp failure is controlled SD, RC oscillator outer meeting resistance R 2, capacitor C 4produce vibration, output meets two high-power MOS field effect transistor Q of push-pull amplifier through recommending amplification driving circuit 1, Q 2grid, Q 1, Q 2drain and meet transformer T 1inductance L 1two ends, vibration drives chip power end through resistance R 7decompression capacitor C 8bypass and inductance L 1mid point is through inductance L 3, capacitor C 7bypass connects DC low voltage power supply, Q 2source series resistance R 6ground connection, through resistance R 4, capacitor C 6connect vibration and drive chip CS, pusb pull oscilator is by two high-power MOS field effect transistor Q 3, Q 4drain electrode meets transformer T 3inductance L 4two ends, Q 3, Q 4grid meets transformer T 2inductance L 8two ends, inductance L 8mid point source ground field effect transistor in parallel Q 5drain electrode and resistance R 8, R 14, inductance L 7, resistance R 10with transformer T 3inductance L 5closure, inductance L 4mid point is through inductance L 9and capacitor C 9connect DC low voltage power supply, Q 3, Q 4source electrode is through earth resistance R 9pressure drop sampling current contact resistance R 11, resistance R 11meet field effect transistor Q with abnormal condition of lamp tube current detector signal 5grid, abnormal condition of lamp tube current detector signal connects vibration and drives chip lamp failure to control SD, push-pull amplifier output power transformer T 1with pusb pull oscilator output power transformer T 3by be added coupler power synthetic, through full-wave rectifying circuit sending and receiving optical diode LED array lamp, benchmark crystal oscillator signal injects vibration through frequency divider and drives chip RC oscillator C tend locking phase, by push-pull amplifier transformer T 1with pusb pull oscilator transformer T 3be added the synthetic mutual coupling note of coupler power lock frequency pulling coherent synchronization locking phase, DC low voltage power supply connects benchmark crystal oscillator, frequency divider power end,
Wherein, full-wave rectifying circuit is by being added coupler T 4inductance L 11two termination high-power MOS field effect transistor Q 6, Q 7source electrode, source electrode, rectifier diode VD in parallel drains 1, VD 2, drain and connect as full-wave rectification output, grid connects biasing resistor, inductance L 11mid point is through abnormal condition of lamp tube current detector mutual inductance magnet ring ground connection, inductance L 12meet diode VD 3detection, capacitor C 11, resistance R 15filtering is through resistance R 13connect vibration and drive chip lamp failure to control SD, through resistance R 12capacitor C 10meet field effect transistor Q 5grid;
The present invention produces good effect: solve DC low-voltage, large electric current power supply self-excitation and it and swash that two to push away the inversion high frequency stabilization Phase synchronization power that vibrates synthetic, reaching single self-excitation or it swashs and recommends the large-power light-emitting diodes LED array lamp illumination that inverter is difficult to obtain, avoid device temperature rise frequency of oscillation to change power imbalances, steady light increases the service life.
Accompanying drawing explanation
Fig. 1 technical solution of the present invention theory diagram
Fig. 2 benchmark crystal oscillating circuit
Fig. 3 DC low voltage power supply note lock LED array lamp circuit
Embodiment
With reference to Fig. 1,2,3, the specific embodiment of the invention and embodiment: comprise DC low voltage power supply 1, LED array fluorescent tube 9, benchmark crystal oscillator 2, frequency divider 3, vibration drive chip 4, push-pull amplifier 5, pusb pull oscilator 6, are added coupler 7, full-wave rectifying circuit 8, abnormal condition of lamp tube current detector 10, wherein, benchmark crystal oscillator 2 is by quartz-crystal resonator JT, two inverter ics 1, IC 2and resistance R 1, capacitor C 0, C 1, C 2form first inverter ic 1input and output two ends cross-over connection biasing resistor R 1, and respectively and meet ground capacity C 1, C 2, meanwhile, go back cross-over connection series connection trimming capacitor C 0quartz-crystal resonator JT, benchmark crystal oscillator 2 output signals are through second inverter ic 2access frequency divider 3, vibration drives chip 4, i.e. IC 4iR2156 includes RC oscillator, recommends amplification driving circuit, current detecting CS, lamp failure control SD, RC oscillator outer meeting resistance R 2, capacitor C 4produce vibration, output meets 5 two high-power MOS field effect transistor Q of push-pull amplifier through recommending amplification driving circuit 1, Q 2grid, Q 1, Q 2drain and meet transformer T 1inductance L 1two ends, vibration drives chip 4 power end V cCthrough resistance R 7decompression capacitor C 8bypass and inductance L 1mid point is through inductance L 3, capacitor C 7bypass meets DC low voltage power supply+V, Q 2source series resistance R 6ground connection, through resistance R 4, capacitor C 6connect the CS end that vibration drives chip 4, pusb pull oscilator 6 is by two high-power MOS field effect transistor Q 3, Q 4drain electrode meets transformer T 3inductance L 4two ends, Q 3, Q 4grid meets transformer T 2inductance L 8two ends, inductance L 8mid point source ground field effect transistor in parallel Q 5drain electrode and biasing resistor R 8, R 14, inductance L 7, resistance R 10with transformer T 3inductance L 5closure, inductance L 4mid point is through inductance L 9with shunt capacitance C 9meet DC low voltage power supply+V, Q 3, Q 4source electrode is through earth resistance R 9pressure drop sampling current contact resistance R 11, resistance R 11meet field effect transistor Q with abnormal condition of lamp tube current detector 10 signals 5grid, abnormal condition of lamp tube current detector 10 signals are through resistance R 13connecing vibration drives chip lamp failure to control SD end, push-pull amplifier 5 output power transformer T 1with pusb pull oscilator 6 output power transformer T 3by be added coupler 7 power synthetic, through full-wave rectifying circuit 8 sending and receiving optical diode LED array lamps 9, benchmark crystal oscillator 2 signals inject through frequency divider 3 the RC oscillator C that vibration drives chips 4 tend locking phase, by push-pull amplifier 5 transformer T 1with pusb pull oscilator 6 transformer T 3be added the synthetic mutual coupling note of coupler 7 power lock frequency pulling coherent synchronization locking phase, DC low voltage power supply 1 connects benchmark crystal oscillator 2, frequency divider 3 power ends.
IC 4pin mark function: V cCpower end, C tmeet vibration timing capacitor C 4, R tmeet vibration timing resistor R 2, H odrive Q 1, L odrive Q 2, CS current detecting, the protection of SD lamp failure is controlled, COM ground connection.
Vibration drives chip IC 4power end V cCby resistance R 7step-down, capacitor C 8filtering is supplied with and is produced vibration, and external excited oscillation drives push-pull amplifier Q 1, Q 2, conducting in turn, cut-off half cycle; Pusb pull oscilator self-oscillation Q 3, Q 4conducting in turn, cut-off half cycle, twoly push away power outputs coupler stack is synthetic drag large-power lamp through being added, and dilatation is reliable, but requires two oscillating voltage phase places consistent, and to eliminate, non-linear intermodulation power is unbalanced obtains stable power output.For this reason, introduce injection phase-locking and solve power synthesis phase simultaneous techniques.
Benchmark crystal oscillator quartz resonator frequency is subject to variations in temperature minimum, highly stable.Reference signal is injected vibration through frequency divider and is driven chip lock phase bit.Do not inject reference signal vibration and drive chip IC 4rC oscillator free frequency, inject reference signal RC oscillating voltage synthetic with its vector, by RC vibrator non-linearity frequency conversion locking phase, oscillator signal and injection reference signal only have a fixing phase difference.Synchronization bandwidth and injecting power direct ratio, with RC oscillator loaded Q inverse ratio, because reference signal is infused in input, gain high, small-power locking.Frequency divider IC 3binary system or decade counter frequency division.
Injection phase-locking is without voltage-controlled tuning, phase demodulation and loop filtering, and therefore simple in structure, fringe cost is low.Injection phase-locking there is not difference with looped phase locking in essence, superior performance, be added coupler stack push-pull amplifier and pusb pull oscilator power output synthetic, " closely binding " mutual coupling note lock effect push-pull amplifier traction pusb pull oscilator frequency coherence genlocing phase place, be suitable for the synthetic light fixture stable oscillation stationary vibration frequency plot of power synchronous, avoid the too high power imbalances of device temperature rise, steady light increases the service life.
Be added coupler T 4inductance L 10by two, recommend output power transformer T 1, T 3inductance L 2, L 6anti-phase exciting current stack, 180 ° of low-order harmonics of phase difference are cancelled out each other, and output current conversion doubles summation and delivers to lamp load, and input voltage, frequency, phase place and load are identical, and electric current equates equalizing resistance R 20no power waste.
Pusb pull oscilator T 2, T 3dual transformer vibration, output transformer T 3unsaturated, effect is high.Resonance frequency is adjusted L 4, oscillatory feedback is adjusted resistance R 10or inductance L 5, adjusting frequency and feeding back mutually does not involve.
Lamp abnormal current magnet ring inductance L 12voltage diode VD 3detection, resistance R 15, capacitor C 11filtering is through resistance R 12, capacitor C 10make Q 5conducting, pusb pull oscilator power tube Q 3, Q 4cut-off; Vibration drives chip IC 4lamp failure controller SD controls failure of oscillation, protection push-pull amplifier Q 1, Q 2.Meanwhile, lamp abnormal current resistance R 6pressure drop is through resistance R 4, capacitor C 6make chip IC 4current detecting CS opens protection Q 1, Q 2; Lamp abnormal current resistance R 9pressure drop is through resistance R 11, capacitor C 10and then make Q 5conducting, duplicate protection Q 3, Q 4.
Full-wave rectifying circuit high-power MOS field effect transistor Q 6, Q 7parallel diode VD 1, VD 2reduce dead resistance, reduce the wastage, improve rectification efficiency, the voltage ripple of output is low, and light is stable.Resistance R 16, R 17, R 18, R 19high-power MOS field effect transistor Q is provided 6, Q 7bias pressure.
Embodiment supply voltage 30V, inverter current 2.5A, lights 65W LED array lamp RL, efficiency 86%, the trade dress of turning on light round the clock advertisement, power tube temperature rise in permissible value, long service life.

Claims (2)

1. a DC low voltage power supply note is locked LED array lamp, comprise DC low voltage power supply, LED array fluorescent tube, it is characterized in that: also comprise benchmark crystal oscillator, frequency divider, vibration drives chip, push-pull amplifier, pusb pull oscilator, be added coupler, full-wave rectifying circuit, abnormal condition of lamp tube current detector, wherein, benchmark crystal oscillator is by quartz-crystal resonator, two inverters and resistance, electric capacity forms, first inverter input and output two ends cross-over connection biasing resistor, and respectively and connect ground capacity, simultaneously, the quartz-crystal resonator of cross-over connection series connection trimmer also, benchmark crystal oscillator output signal is through second inverter access frequency divider, vibration drives chip to include RC oscillator, recommend amplification driving circuit, current detecting CS, lamp failure is controlled SD, RC oscillator outer meeting resistance R 2, capacitor C 4produce vibration, output meets two high-power MOS field effect transistor Q of push-pull amplifier through recommending amplification driving circuit 1, Q 2grid, Q 1, Q 2drain and meet transformer T 1inductance L 1two ends, vibration drives chip power end through resistance R 7decompression capacitor C 8bypass and inductance L 1mid point is through inductance L 3, capacitor C 7bypass connects DC low voltage power supply, Q 2source series resistance R 6ground connection, through resistance R 4, capacitor C 6connect vibration and drive chip CS, pusb pull oscilator is by two high-power MOS field effect transistor Q 3, Q 4drain electrode meets transformer T 3inductance L 4two ends, Q 3, Q 4grid meets transformer T 2inductance L 8two ends, inductance L 8mid point source ground field effect transistor in parallel Q 5drain electrode and resistance R 8, R 14, inductance L 7, resistance R 10with transformer T 3inductance L 5closure, inductance L 4mid point is through inductance L 9with shunt capacitance C 9connect DC low voltage power supply, Q 3, Q 4source electrode is through earth resistance R 9pressure drop sampling current contact resistance R 11, resistance R 11meet field effect transistor Q with abnormal condition of lamp tube current detector signal 5grid, abnormal condition of lamp tube current detector signal connects vibration and drives chip lamp failure to control SD, push-pull amplifier output power transformer T 1with pusb pull oscilator output power transformer T 3by be added coupler power synthetic, through full-wave rectifying circuit sending and receiving optical diode LED array lamp, benchmark crystal oscillator signal injects vibration through frequency divider and drives chip RC oscillator C tend locking phase, by push-pull amplifier transformer T 1with pusb pull oscilator transformer T 3be added the synthetic mutual coupling note of coupler power lock frequency pulling coherent synchronization locking phase, DC low voltage power supply connects benchmark crystal oscillator, frequency divider power end.
2. DC low voltage power supply note lock LED array lamp according to claim 1, is characterized in that: full-wave rectifying circuit is by being added coupler T 4inductance L 11two termination high-power MOS field effect transistor Q 6, Q 7source electrode, source electrode, rectifier diode VD in parallel drains 1, VD 2, drain and connect as full-wave rectification output, grid connects biasing resistor, inductance L 11mid point is through abnormal condition of lamp tube current detector mutual inductance magnet ring ground connection, inductance L 12meet diode VD 3detection, capacitor C 11, resistance R 15filtering is through resistance R 13connect vibration and drive chip lamp failure to control SD, through resistance R 12, capacitor C 10meet field effect transistor Q 5grid.
CN201310155135.0A 2013-04-15 2013-04-15 Direct-current low-voltage power supply injection-locking light emitting diode (LED) array lamp Pending CN104105250A (en)

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Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101400203A (en) * 2007-09-28 2009-04-01 李宗凤 Electronic ballast for gas discharging lamp
CN201957315U (en) * 2011-04-03 2011-08-31 阮树成 Solar energy eight push-pull oscillation high voltage sodium lamp
CN201956907U (en) * 2011-04-03 2011-08-31 阮小青 Dual-bridge oscillation electronic transformer with DC low voltage power supply
CN201976325U (en) * 2011-04-03 2011-09-14 阮雪芬 Four-bridge oscillation power synthesis electrodeless lamp of direct-current low-voltage power supply
CN203181316U (en) * 2013-04-15 2013-09-04 阮小青 Direct-current low-voltage power supply injection-locking light emitting diode LED array lamp

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