CN101873750A - LED (light emitting diode) lamp fault processing method, LED driver and LED lamp - Google Patents

LED (light emitting diode) lamp fault processing method, LED driver and LED lamp Download PDF

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Publication number
CN101873750A
CN101873750A CN201010211674A CN201010211674A CN101873750A CN 101873750 A CN101873750 A CN 101873750A CN 201010211674 A CN201010211674 A CN 201010211674A CN 201010211674 A CN201010211674 A CN 201010211674A CN 101873750 A CN101873750 A CN 101873750A
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China
Prior art keywords
optical coupler
triode
pwm control
theft
link chain
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Granted
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CN201010211674A
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Chinese (zh)
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CN101873750B (en
Inventor
李英
赵德琦
吴壬华
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Shenzhen Shinry Technologies Co Ltd
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Shenzhen Shinry Technologies Co Ltd
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Priority to CN2010102116748A priority Critical patent/CN101873750B/en
Priority to PCT/CN2010/075392 priority patent/WO2011160319A1/en
Publication of CN101873750A publication Critical patent/CN101873750A/en
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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
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology
    • 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
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

The invention provides an LED lamp fault processing method, an LED driver and an LED lamp. The method comprises the following steps that when the LED driver normally works, commercial power is loaded to the primary side of a transformer through the rectification circuit of the primary side of a switch power supply and is output to the LED lamp through the rectification circuit of the secondary side of the switch power supply after being transformed in voltage by the transformer; the LED driver samples output direct current; the direct current is transferred to a PWM (Pulse-Width Modulation) control IC (integrated circuit) through an optical coupler; the PWM control IC controls the switch power supply to be turned on or off according to a sampled signal to regulate output voltage; when the LED driver normally works, a safety chain element carries out sampling detection on the optical coupler; when the safety chain element controls the PWM control IC to reduce the duty ratio of PWM waves output by the detects the PWM control IC and reduce the voltage of the secondary side of the transformer to enable the LED driver to be in a protection state when detecting the faults of the optical coupler. The invention can solve the safety problem of the LED driver, in particular to the safety problem when the optical coupler generates the faults.

Description

A kind of LED lamp failure processing method, led driver and LED lamp
Technical field
The present invention relates to electronic application field, relate in particular to a kind of LED lamp failure processing method, led driver and LED lamp.
Background technology
Because the huge effect of LED lamp in energy-saving and emission-reduction, the LED industry increased rapidly in recent years, had obtained more and more wider application in the Landscape Lighting field.In some developed countries (for example Japan and Germany etc.), the LED lamp has been come into the supermarket, has entered into usual common people's family.
Be accompanied by the fast development of LED industry, standard relevant with LED and industry also develop rapidly.LED develops into today, and the Lights section (lamp pearl) technology is mature on the whole, and its life-span, the key factor that influences its life-span still was the led driver part generally at 70000～100000 hours.And the fault of LED lamp to have more than 70% all be from led driver, so the quality of led driver is directly connected to the useful life of whole LED lamp.
In order to satisfy LED Lantern Festival energy environmental protection requirement, led driver generally adopts Switching Power Supply, compares with conventional lamp, and Switching Power Supply has the efficient height, power factor (Power Factor) height, advantage such as total harmonic component (Total Harmonic Distortion) is little.
Along with the standardization in LED field and coming out of the stove of relevant criterion, generally require led driver to adopt isolated form.For the small power LED illumination product, its isolated form led driver is general to use anti-(Flyback) and single-stage PFC (1-Stage PFC) topology that swashs, wherein single-stage PFC topology preferably, because it is simple that it has a circuit structure, with low cost, power factor height, advantage such as total harmonic component is little.Theory diagram such as Fig. 1 of single-stage PFC show: the rectification circuit on the former limit of civil power input process Switching Power Supply is to transformer, and the break-make of switching tube makes transformer energy pass to secondary from former limit, transmits to the LED load after secondary carries out rectification.Simultaneously, after the direct current signal sampling of led driver to secondary output, be sent to former edge-impulse width modulated (PWM, Pulse Width Modulation) control integrated circuit (IC, Integrated Circuit) by optical coupler, thereby form negative feedback.
But the inventor finds that there is open defect in above-mentioned led driver in implementing process of the present invention:
Have a test to be in the certification test (for example UL) of LED secure context: when detecting the optical coupler open circuit, whether led driver satisfies demand for security.If the led driver power output reduces in the test, it is qualified then to be judged to be.If power output increases, then required before led driver damages, the temperature rise of its safety device (for example transformer) can not surpass limit value.
For circuit common, output voltage rises during the optical coupler open circuit, can come the design protection circuit by the change in voltage that detects the former limit of transformer winding.And for led driver, because its load is the LED lamp, the led driver output voltage is owing to be subjected to the clamper (characteristic of LED load) of LED load, so when optical coupler is opened a way, the led driver output voltage can not change, but output current can increase, and power output increases, temperature rises thereby make.
So present led driver can't be by the certification test of secure context; Simultaneously, above-mentioned situation illustrates that also there is hidden danger in present led driver at secure context.
Want head it off, generally the way that can expect is to increase a current foldback circuit, but this need increase an extra optical coupler and realize, has increased design cost greatly.Simultaneously, for LED fluorescent lamp and the such occasion of bulb lamp,, the restriction of led driver volume is only allowed to exist an optical coupler because its size is especially little.
Summary of the invention
Embodiment of the invention technical problem to be solved is, a kind of LED lamp failure processing method, led driver and LED lamp are provided, and can effectively solve the safety problem of led driver, the safety problem when particularly optical coupler breaks down.Simultaneously, that LED lamp failure processing method provided by the invention, led driver and LED lamp are realized is simple, with low cost, be particularly suitable for for small size, low cost, lower powered led driver, can effectively solve its problem at secure context.
In order to solve the problems of the technologies described above, the embodiment of the invention provides a kind of LED lamp failure processing method, when the led driver operate as normal, civil power is loaded into the former limit of transformer by the rectification circuit on the former limit of Switching Power Supply, through after the transformer transformation, by with the rectification circuit of Switching Power Supply secondary to LED lamp output DC;
Led driver is sampled to the direct current of the rectification circuit output of described Switching Power Supply secondary; And transmit to the PWM control IC by optical coupler; The PWM control IC by controlling the break-make of described switching tube, is adjusted the dc voltage of the rectification circuit output of described Switching Power Supply secondary according to the dc signal of sampling.
When described led driver operate as normal, whether sample to described optical coupler in the theft-resistant link chain unit, detect described optical coupler and break down;
When described theft-resistant link chain unit detected described optical coupler fault, the described PWM control IC of described theft-resistant link chain unit controls reduced the PWM ripple duty ratio of its output, reduces described transformer secondary voltage, makes described led driver be in guard mode.
Wherein, when described theft-resistant link chain unit detected described optical coupler fault, the described PWM control IC of described theft-resistant link chain unit controls reduced the PWM ripple duty ratio of its output, reduces described transformer secondary voltage, makes described led driver be in guard mode and comprises:
When described optical coupler fault, the described PWM control IC of described theft-resistant link chain unit controls reduces the PWM ripple duty ratio of its output;
Switching tube reduces the time of its conducting according to the PWM ripple duty ratio of PWM control IC output, and transformer original edge voltage ON time is shortened;
The dc voltage of the rectification circuit output of transformer secondary reduces;
When the dc voltage of the rectification circuit of described secondary output was lower than the conducting voltage of LED lamp, described led driver was in guard mode.
Wherein, sample to described optical coupler in the theft-resistant link chain unit, and the mode of controlling described PWM control IC comprises:
Sample the high-end of described optical coupler in the theft-resistant link chain unit, when detecting described optical coupler fault, described theft-resistant link chain unit draws electric current (SOURCE CURRENT) to the respective pin of described PWM control IC, makes described PWM control IC reduce the PWM ripple duty ratio of its output; Or
Sample the high-end of described optical coupler in the theft-resistant link chain unit, when detecting described optical coupler fault, electric current (SINKCURRENT) is irritated to the respective pin of described PWM control IC in described theft-resistant link chain unit, makes described PWM control IC reduce the PWM ripple duty ratio of its output; Or
Sample at the low side of described optical coupler in the theft-resistant link chain unit, when detecting described optical coupler fault, described theft-resistant link chain unit draws electric current to the respective pin of described PWM control IC, makes described PWM control IC reduce the PWM ripple duty ratio of its output; Or
Sample at the low side of described optical coupler in the theft-resistant link chain unit, when detecting described optical coupler fault, electric current is irritated to the respective pin of described PWM control IC in described theft-resistant link chain unit, makes described PWM control IC reduce the PWM ripple duty ratio of its output.
Correspondingly, the embodiment of the invention also provides a kind of led driver, comprising: transformer is used for the voltage of outside input is carried out pressure regulation, the former limit of described transformer links to each other with the rectification circuit on the former limit of Switching Power Supply, and the secondary of described transformer links to each other with the rectification circuit of Switching Power Supply secondary; Switching tube is used to control the break-make of described transformer original edge voltage; The rectification circuit on the former limit of Switching Power Supply is used for converting civil power to direct current; The rectification circuit of Switching Power Supply secondary is used for the rectification of described transformer secondary current, and to LED lamp output DC; It is characterized in that described led driver also comprises:
Sampling unit is used for the direct current that the rectification circuit of described Switching Power Supply secondary is exported is sampled;
Optical coupler after being used for dc signal with the sampling of described sampling unit and carrying out the photoelectricity isolation processing, transmits to the PWM control IC by the theft-resistant link chain unit;
The PWM control IC is used for the dc signal according to the transmission of theft-resistant link chain unit, by controlling the break-make of described switching tube, adjusts the dc voltage of the rectification circuit output of described Switching Power Supply secondary;
The theft-resistant link chain unit; be connected between described optical coupler and the described PWM control IC; be used for described optical coupler is carried out sample detecting; when described optical coupler fault; reduce the PWM ripple duty ratio of described PWM control IC output; described transformer secondary voltage is reduced, and led driver is in guard mode.
Wherein, the PWM ripple duty ratio that described PWM control IC reduces its output is controlled in the theft-resistant link chain unit when described optical coupler fault; Then
Described switching tube reduces according to the PWM ripple duty ratio of PWM control IC output, thereby reduces the ON time of described switching tube; The transformer secondary reduces through the dc voltage of the rectification circuit output of Switching Power Supply secondary; When the dc voltage of the rectification circuit of described Switching Power Supply secondary output was lower than the conducting voltage of LED lamp, described led driver was in guard mode.
Wherein, a kind of theft-resistant link chain unit implementation is: theft-resistant link chain unit one end is connected with the high-end of described optical coupler, and the other end is connected with described PWM control IC; The low side of described optical coupler is connected with described PWM control IC;
Sample the high-end of described optical coupler in described theft-resistant link chain unit; when detecting described optical coupler fault; described PWM control IC is drawn electric current; make described PWM control IC reduce the PWM ripple duty ratio of its output; described transformer secondary voltage is reduced, and led driver is in guard mode.
Wherein, above-mentioned theft-resistant link chain unit comprises: first resistance R 11, second resistance R 12, the 3rd resistance R 13, first capacitor C 11, second capacitor C 12, the first triode Q11, the second triode Q12 and the first diode D11;
The high-end base stage with the first triode Q11 of described optical coupler is connected, and the low side of described optical coupler is connected with described PWM control IC;
The emitter of the described theft-resistant link chain unit first triode Q11 is connected with dc power supply, and the two ends of first resistance R 11 and first capacitor C 11 are connected with emitter with the base stage of the first triode Q11 respectively; The two ends of second capacitor C 12 are connected with the collector and emitter of the first triode Q11; The collector electrode of the first triode Q11 is by second resistance R, 12 ground connection;
The grounded collector of the second triode Q12, base stage is connected with the collector electrode of the first triode Q11; The two ends of the 3rd resistance R 13 are connected with emitter with the base stage of the second triode Q12 respectively; The negative electrode of the first diode D11 is connected with the emitter of the second triode Q12; The anode of the first diode D11 is connected with described PWM control IC.
Wherein, other plants theft-resistant link chain unit implementation and is: theft-resistant link chain unit one end is connected with the high-end of described optical coupler, and the other end is connected with described PWM control IC; The low side of described optical coupler is connected with described PWM control IC;
Sample the high-end of described optical coupler in described theft-resistant link chain unit; when detecting described optical coupler fault; described PWM control IC is irritated electric current; make described PWM control IC reduce the PWM ripple duty ratio of its output; described transformer secondary voltage is reduced, and led driver is in guard mode.
Wherein, above-mentioned theft-resistant link chain unit comprises: the 4th resistance R 21, the 5th resistance R 22, the 6th resistance R 23, the 3rd capacitor C 21, the 4th capacitor C 22, the 3rd triode Q21, the 4th triode Q22 and the second diode D21;
The high-end base stage with the 3rd triode Q21 of described optical coupler is connected, and the low side of described optical coupler is connected with described PWM control IC;
The emitter of described theft-resistant link chain unit the 3rd triode Q21 is connected with dc power supply, and the two ends of the 4th resistance R 21 and the 3rd capacitor C 21 are connected with emitter with the base stage of the 3rd triode Q21 respectively; The two ends of the 4th capacitor C 22 are connected with the collector and emitter of the 3rd triode Q21; The collector electrode of the 3rd triode Q21 is by the 5th resistance R 22 ground connection;
The collector electrode of the 4th triode Q22 is connected with described PWM control IC, and emitter is connected with the emitter of the 3rd triode Q21; The base stage of the 4th triode Q22 is connected with the anode of the second diode D21, and the collector electrode of negative electrode the 3rd triode Q21 of the second diode D21 connects; The two ends of the 6th resistance R 23 are connected with emitter with the base stage of the 4th triode Q22 respectively.
Wherein, other plants theft-resistant link chain unit implementation and is: theft-resistant link chain unit one end is connected with the low side of described optical coupler, and the other end is connected with described PWM control IC; High-end and the described PWM control IC of described optical coupler is connected;
Sample at the low side of described optical coupler in described theft-resistant link chain unit; when detecting described optical coupler fault; described PWM control IC is drawn electric current; make described PWM control IC reduce the PWM ripple duty ratio of its output; described transformer secondary voltage is reduced, and led driver is in guard mode.
Wherein, above-mentioned theft-resistant link chain unit comprises: the 7th resistance R 31, the 8th resistance R 32, the 9th resistance R 33, the 5th capacitor C 31, the 6th capacitor C 32, the 5th triode Q31, the 6th triode Q32;
The low side of described optical coupler is connected with the base stage of the 5th triode Q31, and the high-end and described PWM control IC of described optical coupler is connected; The collector electrode of the 5th triode Q31 of described theft-resistant link chain unit is connected the grounded emitter of the 5th triode Q31 by the 8th resistance R 32 with dc power supply;
The 7th resistance R 31 of described theft-resistant link chain unit and the two ends of the 5th capacitor C 31 are connected with emitter with the base stage of the 5th triode Q31 respectively; The two ends of the 6th capacitor C 32 and the 9th resistance R 33 are connected with the collector and emitter of the 5th triode Q31 respectively;
The collector electrode of the 6th triode Q32 is connected with described PWM control IC, grounded emitter, and base stage is connected with the collector electrode of the 5th triode Q31.
Wherein, other plants theft-resistant link chain unit implementation and is: theft-resistant link chain unit one end is connected with the low side of described optical coupler, and the other end is connected with described PWM control IC; High-end and the described PWM control IC of described optical coupler is connected;
Sample at the low side of described optical coupler in described theft-resistant link chain unit; when detecting described optical coupler fault; described PWM control IC is irritated electric current; make described PWM control IC reduce the PWM ripple duty ratio of its output; described transformer secondary voltage is reduced, and led driver is in guard mode.
Wherein, above-mentioned theft-resistant link chain unit comprises: the tenth resistance R the 41, the 11 resistance R the 42, the 12 resistance R 43, the 7th capacitor C 41, the 8th capacitor C 42, the 7th triode Q41, the 8th triode Q42;
The low side of described optical coupler is connected with the base stage of the 7th triode Q41, and the high-end and described PWM control IC of described optical coupler is connected; The collector electrode of the 7th triode Q41 of described theft-resistant link chain unit is connected the grounded emitter of the 7th triode Q41 by the 11 resistance R 42 with dc power supply;
The tenth resistance R 41 of described theft-resistant link chain unit and the two ends of the 7th capacitor C 41 are connected with emitter with the base stage of the 7th triode Q41 respectively; The two ends of the 8th capacitor C 42 and the 12 resistance R 43 are connected with the collector and emitter of the 7th triode Q41 respectively;
The collector electrode of the 8th triode Q42 is connected with power supply, and base stage is connected with the collector electrode of the 7th triode Q41, and emitter is connected with described PWM control IC.
Simultaneously, the embodiment of the invention also provides a kind of LED lamp, and this LED lamp adopts above-mentioned led driver.
Implement the embodiment of the invention, have following beneficial effect: can effectively solve the safety problem of led driver, the safety problem when particularly optical coupler breaks down.Simultaneously, that LED lamp failure processing method provided by the invention, led driver and LED lamp are realized is simple, with low cost, be particularly suitable for for small size, low cost, lower powered led driver, can effectively solve its problem at secure context.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is existing led driver structural representation;
Fig. 2 is existing led driver power supply schematic flow sheet;
Fig. 3 is existing led driver FEEDBACK CONTROL schematic flow sheet;
Fig. 4 is the LED lamp failure processing method first embodiment schematic flow sheet provided by the invention;
Fig. 5 is the LED lamp failure processing method second embodiment schematic flow sheet provided by the invention;
Fig. 6 is a led driver example structure schematic diagram provided by the invention;
Fig. 7 is the theft-resistant link chain unit first example structure schematic diagram in the led driver provided by the invention;
Fig. 8 is a kind of circuit structure of realizing theft-resistant link chain unit shown in Figure 7;
Fig. 9 is PWM control IC chip pin figure;
Figure 10 is the another kind of circuit structure that can realize theft-resistant link chain unit shown in Figure 7;
Figure 11 is the theft-resistant link chain unit second example structure schematic diagram in the led driver provided by the invention;
Figure 12 is a kind of circuit structure of realizing theft-resistant link chain unit shown in Figure 11;
Figure 13 is the another kind of circuit structure that can realize theft-resistant link chain unit shown in Figure 11.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Referring to Fig. 2, be existing led driver power supply schematic flow sheet.Existing led driver structure as shown in Figure 1.Existing led driver is powered flow process as shown in Figure 2:
At step S200, civil power is from the rectification circuit input on the former limit of Switching Power Supply.
At step S201, during the Switching Power Supply conducting, voltage is loaded into the former limit of transformer.
At step S202, after the voltage transformation of transformer to input, be transported to the rectification circuit of Switching Power Supply secondary.
At step S203, the rectification circuit of Switching Power Supply secondary is to export to the LED lamp behind the direct current with current commutates.
Referring to Fig. 3, be existing led driver FEEDBACK CONTROL schematic flow sheet.As shown in Figure 3:
At step S300, the direct current that the rectification circuit of Switching Power Supply secondary is exported is sampled.
At step S301, transmit the current and voltage signals of sampling to the PWM control IC by optical coupler.
At step S302, the PWM control IC is adjusted the pulsewidth of the PWM ripple of its output according to the dc signal of sampling.
At step S303, switching tube is adjusted the dc voltage of the rectification circuit output of described Switching Power Supply secondary according to the break-make of the pulse width control transformer original edge voltage of PWM ripple.
Referring to Fig. 4, be the LED lamp failure processing method first embodiment schematic flow sheet provided by the invention, as shown in the figure:
At step S400, when the led driver operate as normal, sample to described optical coupler in the theft-resistant link chain unit, and detect optical coupler and whether break down, if do not break down, execution in step S401 then; If break down, execution in step S402 then.
At step S401, optical coupler just often, the theft-resistant link chain unit does not process to the current signal that the PWM control IC transmits described optical coupler.
At step S402, when detecting the optical coupler fault in the theft-resistant link chain unit, described theft-resistant link chain unit controls PWM control IC reduces the PWM ripple duty ratio of its output.
At step S403, reduce the transformer secondary voltage, make led driver be in guard mode.
The LED lamp failure processing method that the embodiment of the invention provides can effectively solve the safety problem of led driver, the safety problem when particularly optical coupler breaks down.
Referring to Fig. 5, be the LED lamp failure processing method second embodiment schematic flow sheet provided by the invention, in the present embodiment, with the flow process of this LED lamp failure processing method of more detailed description.As shown in the figure:
Whether at step S500, when the led driver operate as normal, sample to described optical coupler in the theft-resistant link chain unit, detect optical coupler and break down.If do not break down, execution in step S501 then; If break down, execution in step S502 then.
At step S501, optical coupler just often, the theft-resistant link chain unit does not process to the current signal that the PWM control IC transmits described optical coupler.
At step S502, when described theft-resistant link chain unit detected described optical coupler fault, theft-resistant link chain unit controls PWM control IC reduced the PWM ripple duty ratio of its output.
At step S503, switching tube reduces the time of its conducting according to the PWM ripple duty ratio of PWM control IC output, and transformer original edge voltage ON time is shortened.
At step S504, the transformer secondary reduces through the dc voltage of the rectification circuit output of Switching Power Supply secondary.
At step S505, when the galvanic voltage of the rectification circuit of Switching Power Supply secondary output was lower than the conducting voltage of LED lamp, led driver entered guard mode.
More specifically, at step S501, the mode that control PWM control IC reduces the PWM ripple duty ratio of its output comprises:
Sample the high-end of optical coupler in the theft-resistant link chain unit, when detecting the optical coupler fault, the theft-resistant link chain unit draws electric current to the PWM control IC, makes the PWM control IC reduce the PWM ripple duty ratio of its output, described transformer secondary voltage is reduced, and led driver is in guard mode;
Or sample the high-end of optical coupler in the theft-resistant link chain unit, when detecting the optical coupler fault, electric current is irritated to the PWM control IC in the theft-resistant link chain unit, makes the PWM control IC reduce the PWM ripple duty ratio of its output, described transformer secondary voltage is reduced, and led driver is in guard mode;
Or sample at the low side of optical coupler in the theft-resistant link chain unit, when detecting the optical coupler fault, the theft-resistant link chain unit draws electric current to the PWM control IC, makes the PWM control IC reduce the PWM ripple duty ratio of its output, described transformer secondary voltage is reduced, and led driver is in guard mode;
Or sample at the low side of optical coupler in the theft-resistant link chain unit; when detecting the optical coupler fault, electric current is irritated to the PWM control IC in the theft-resistant link chain unit, makes the PWM control IC reduce the PWM ripple duty ratio of its output; described transformer secondary voltage is reduced, and led driver is in guard mode.
The LED lamp failure processing method that the embodiment of the invention provides, can effectively solve the safety problem of led driver, safety problem when particularly optical coupler breaks down, reduce the ON time of switching tube, effectively reduce the transformer secondary voltage, avoid led driver excessive because of power, intensification exceeds standard, and ensures the safety of complete machine.
Referring to Fig. 6, be led driver example structure schematic diagram provided by the invention, the led driver that present embodiment provides can be realized aforesaid LED lamp failure processing method, as shown in the figure, this led driver comprises:
Transformer 1 is used for the voltage of outside input is carried out pressure regulation, and the former limit of described transformer links to each other with the rectification circuit 2 on the former limit of Switching Power Supply, and the secondary of described transformer links to each other with the rectification circuit 3 of Switching Power Supply secondary; The rectification circuit 2 on the former limit of Switching Power Supply is used for civil power is become direct current; Switching tube 9 is controlled the break-make of described transformer 1 original edge voltage; The rectification circuit 3 of Switching Power Supply secondary is used for the rectification of described transformer secondary current, and to LED load 4 output DCs.
Crucial, described led driver also comprises:
Sampling unit 5 is used for the direct current that the rectification circuit 3 of described Switching Power Supply secondary is exported is sampled;
Optical coupler 6 after being used for dc signal with 5 samplings of described sampling unit and carrying out the photoelectricity isolation processing, transmits to PWM control IC 8 by the theft-resistant link chain unit;
PWM control IC 8 is used for the dc signal according to 7 transmission of described theft-resistant link chain unit, by controlling the break-make of described switching tube 9, adjusts the dc voltage of rectification circuit 3 outputs of described Switching Power Supply secondary;
Theft-resistant link chain unit 7; be connected between described optical coupler 6 and the described PWM control IC 8; be used for described optical coupler 6 is carried out sample detecting; when described optical coupler 6 faults; reduce the PWM ripple duty ratio of described PWM control IC 8 outputs; described transformer 1 secondary voltage is reduced, and led driver is in guard mode.
More specifically, theft-resistant link chain unit 7 is when optical coupler 6 faults, and control PWM control IC 8 reduces the PWM ripple duty ratio of its output; Switching tube 9 is according to the minimizing of the PWM ripple duty ratio of PWM control IC 8 output, reduces the ON time of switching tube 9 self, thereby reduces transformer 1 original edge voltage ON time; Transformer 1 secondary reduces through the dc voltage of rectification circuit 3 outputs of Switching Power Supply secondary; When the dc voltage of rectification circuit 3 output of Switching Power Supply secondary was lower than the conducting voltage of LED load 4, led driver was in guard mode.
The led driver that present embodiment provides can effectively solve the safety problem of led driver, the safety problem when particularly optical coupler breaks down.Simultaneously, that led driver that present embodiment provides is realized is simple, with low cost, be particularly suitable for for small size, low cost, lower powered led driver, can effectively solve its problem at secure context.
Referring to Fig. 7, be the first example structure schematic diagram of the theft-resistant link chain unit in the led driver provided by the invention.As shown in Figure 7:
Theft-resistant link chain unit 7 one ends are connected with the high-end of optical coupler 6, and the other end is connected with PWM control IC 8; The low side of optical coupler 6 is connected with PWM control IC 8;
Sample the high-end of optical coupler 6 in theft-resistant link chain unit 7; when detecting optical coupler 6 faults; PWM control IC 8 is drawn electric current or irritated electric current; make PWM control IC 8 reduce the PWM ripple duty ratio of its output; described transformer secondary voltage is reduced, and led driver is in guard mode.
Referring to Fig. 8, for a kind of circuit structure of realizing theft-resistant link chain unit shown in Figure 7, can control the PWM control IC by the mode of drawing electric current, as shown in Figure 8:
This theft-resistant link chain unit comprises: first resistance R 11, second resistance R 12, the 3rd resistance R 13, first capacitor C 11, second capacitor C 12, the first triode Q11, the second triode Q12 and the first diode D11.
The high-end base stage with the first triode Q11 of optical coupler is connected, and the low side of optical coupler is connected with the PWM control IC.
The emitter of the theft-resistant link chain unit first triode Q11 is connected with dc power supply, and the two ends of first resistance R 11 and first capacitor C 11 are connected with emitter with the base stage of the first triode Q11 respectively; The two ends of second capacitor C 12 are connected with the collector and emitter of the first triode Q11; The collector electrode of the first triode Q11 is by second resistance R, 12 ground connection.
The grounded collector of the second triode Q12, base stage is connected with the collector electrode of the first triode Q11; The two ends of the 3rd resistance R 13 are connected with emitter with the base stage of the second triode Q12 respectively; The negative electrode of the first diode D11 is connected with the emitter of the second triode Q12; The anode of the first diode D11 is connected with the PWM control IC.
Further, the operation principle of foregoing circuit is:
Led driver is when operate as normal, 4 pin of optical coupler drag down, the first triode Q11 conducting, make the base stage of the second triode Q12 become high level state, the second triode Q12 by, the negative electrode of the first diode D11 is a high level, because the unidirectional on state characteristic of diode, so the theft-resistant link chain unit is to the not influence of PWM control IC.
When fault occurs, the former limit open circuit of optical coupler ISO, its 4 pin voltage is converted to high level (high level is defined as near Va, and is as follows) by low level (low level is defined as near zero potential, and is as follows); The first triode Q11 is become by state by conducting state; Va is to 12 chargings of second capacitor C, and its charging interval is by the time constant decision of second resistance R 12 and second capacitor C 12; After second capacitor C 12 was full of electricity, the voltage at second resistance R, 12 two ends was reduced to low level by high level; The second triode Q12 is by becoming conducting state by state; The respective pins B of PWM control IC is dragged down; The PWM ripple of PWM control IC output narrows down like this, thereby causes output voltage to reduce, and drops to when output voltage below the conducting voltage of LED load, and complete machine is in guard mode.
More specifically, in this circuit, another effect of second resistance R 12 and second capacitor C 12 is to guarantee in the led driver start-up course, and the theft-resistant link chain unit can misoperation.
Wherein the first diode D11 guarantees that the theft-resistant link chain unit just draws electric current effective, rather than irritates electric current; The 3rd resistance R 13 is to guarantee the reliable break-make of the second triode Q12; First resistance R 11 is to guarantee the reliable break-make of the first triode Q11.First capacitor C 11 is in order to guarantee that the theft-resistant link chain circuit can be to normal feedback generation influence.
3 pin of optical coupler link to each other with the respective pins A of PWM control IC.Wherein the respective pins A of PWM control IC is meant the pin that links to each other with optical coupler, and the pin B of PWM control IC is the pin of theft-resistant link chain unit effect, and this pin is drawing current-mode can make the PWM control IC be in the no-output state.
Preferably, the PWM control IC is divided into two classes in the present embodiment, and a class is to do the chip of single-stage PFC, and another kind of is the chip that instead swashs type.
Chip for single-stage PFC type, L6562D with ST is an example, shown in Fig. 9 a, pin A just is meant 1 pin of L6562D, and pin B just is meant 2 pin of L6562D, and other are similar to the chip of L6562D, UCC28051 as TI company, UCC28811, the TDA4863 of Infineon company, TDA4863-2 etc. are same usages.For the anti-chip that swashs type, be example with UC2845, shown in Fig. 9 b, the A pin of its PWM control IC just is meant 2 pin of UC2845, and the B pin of its PWM control IC just is meant 1 pin of UC2845, and other are similar to the chip of UC2845, as UC2842, UC2843, UC2844 etc. are same usages.
Need to prove, foregoing circuit only is a kind of preferred embodiment of the present invention, the other three kinds of circuit that can realize above-mentioned functions equally below also will be provided, therefore, can not limit the present invention's interest field with the circuit that present embodiment provides, and, must belong to the scope that the present invention is contained according to the equal variation of foregoing circuit.
Referring to Figure 10, for another kind can be realized the circuit structure of theft-resistant link chain unit shown in Figure 7, can control the PWM control IC by the mode of irritating electric current, as shown in figure 10:
This theft-resistant link chain unit comprises: the 4th resistance R 21, the 5th resistance R 22, the 6th resistance R 23, the 3rd capacitor C 21, the 4th capacitor C 22, the 3rd triode Q21, the 4th triode Q22 and the second diode D21.
The high-end base stage with the 3rd triode Q21 of this optical coupler is connected, and the low side of this optical coupler is connected with this PWM control IC.
The emitter of this theft-resistant link chain unit the 3rd triode Q21 is connected with dc power supply, and the two ends of the 4th resistance R 21 and the 3rd capacitor C 21 are connected with emitter with the base stage of the 3rd triode Q21 respectively; The two ends of the 4th capacitor C 22 are connected with the collector and emitter of the 3rd triode Q21; The collector electrode of the 3rd triode Q21 is by the 5th resistance R 22 ground connection.
The collector electrode of the 4th triode Q22 is connected with this PWM control IC, and emitter is connected with the emitter of the 3rd triode Q21; The base stage of the 4th triode Q22 is connected with the anode of the second diode D21, and the collector electrode of negative electrode the 3rd triode Q21 of the second diode D21 connects; The two ends of the 6th resistance R 23 are connected with emitter with the base stage of the 4th triode Q22 respectively.
Further, the operation principle of foregoing circuit is:
Led driver is when operate as normal, and 4 pin of optical coupler ISO drag down, and the 3rd triode Q21 conducting makes the negative electrode of the second diode D21 become high level state, the 4th triode Q22 by, this moment, this circuit was to the not influence of PWM control IC.
When fault occurs, the former limit open circuit of optical coupler ISO, its 4 pin voltage is high level by low transition; The 3rd triode Q21 is become by state by conducting state; Just to 22 chargings of the 4th capacitor C, its charging interval is by the time constant decision of the 5th resistance R 22 and the 4th capacitor C 22 for Va; After the 4th capacitor C 22 was full of electricity, the voltage at the 5th resistance R 22 two ends was reduced to low level by high level; The second diode D21 conducting, the 4th triode Q22 is by becoming conducting state by state; Va will irritate electric current to the respective pins B of PWM control IC by the 4th triode Q22; The PWM ripple of PWM control IC output narrows down like this, thereby causes output voltage to reduce, and drops to when output voltage below the conducting voltage of LED load, and complete machine is in guard mode.
Wherein another effect of the 5th resistance R 22 and the 4th capacitor C 22 is exactly to guarantee in the led driver start-up course, and the theft-resistant link chain unit can misoperation.
Wherein the second diode D21 guarantees that the theft-resistant link chain circuit can not produce misoperation; The 6th resistance R 23 is to guarantee the reliable break-make of the 4th triode Q22; The 4th resistance R 21 is to guarantee the reliable break-make of the 3rd triode Q21.
Wherein the 3rd capacitor C 21 is in order to guarantee that the theft-resistant link chain circuit can be to normal feedback generation influence.
Wherein 3 pin of optical coupler ISO link to each other with the respective pins A of PWM control IC.
Wherein the respective pins A of PWM control IC is meant the pin that links to each other with optical coupler, and the respective pins B of PWM control IC is meant the pin of theft-resistant link chain unit effect, and this pin can make the PWM control IC be in the no-output state at the filling current-mode.
Preferably, the PWM control IC is divided into two classes in the present embodiment, and a class is to do the chip of single-stage PFC, and another kind of is the chip that instead swashs type.
Chip for single-stage PFC type, L6562D with ST is an example, shown in Fig. 9 a, pin A just is meant 1 pin of L6562D, and pin B just is meant 1 pin or 4 pin of L6562D, and other are similar to the chip of L6562D, UCC28051 as TI company, UCC28811, the TDA4863 of Infineon company, TDA4863-2 etc. are same usages.For the anti-chip that swashs type, with UC2845 is example, shown in Fig. 9 b, the A pin of its PWM control IC just is meant 2 pin of UC2845, the B pin of its PWM control IC just is meant 2 pin or 3 pin of UC2845, and other are similar to the chip of UC2845, as UC2842, UC2843, UC2844 etc. are same usages.
Need to prove, foregoing circuit only is a kind of preferred embodiment of the present invention, the other two kinds of circuit that can realize above-mentioned functions equally below also will be provided, therefore, can not limit the present invention's interest field with the circuit that present embodiment provides, and, must belong to the scope that the present invention is contained according to the equal variation of foregoing circuit.
Led driver that present embodiment provides and theft-resistant link chain unit can effectively solve the safety problem of led driver, the safety problem when particularly optical coupler breaks down.Simultaneously, that the led driver that present embodiment provides and theft-resistant link chain unit are realized is simple, with low cost, be particularly suitable for for small size, low cost, lower powered led driver, can effectively solve its problem at secure context.
Referring to Figure 11, be the second example structure schematic diagram of the theft-resistant link chain unit in the led driver provided by the invention.As shown in figure 11:
Theft-resistant link chain unit 7 one ends are connected with the low side of optical coupler 6, and the other end is connected with PWM control IC 8; High-end and the PWM control IC 8 of optical coupler 6 is connected;
Sample at the low side of optical coupler 6 in theft-resistant link chain unit 7; when detecting optical coupler 6 faults; PWM control IC 8 is drawn electric current or irritated electric current; make PWM control IC 8 reduce the PWM ripple duty ratio of its output; described transformer secondary voltage is reduced, and led driver is in guard mode.
Referring to Figure 12, for a kind of circuit structure of realizing theft-resistant link chain unit shown in Figure 11, can control the PWM control IC by the mode of drawing electric current, as shown in figure 12:
The theft-resistant link chain unit comprises: the 7th resistance R 31, the 8th resistance R 32, the 9th resistance R 33, the 5th capacitor C 31, the 6th capacitor C 32, the 5th triode Q31, the 6th triode Q32;
The low side of optical coupler is connected with the base stage of the 5th triode Q31, and the high-end and PWM control IC of optical coupler is connected; The collector electrode of the 5th triode Q31 of theft-resistant link chain unit is connected the grounded emitter of the 5th triode Q31 by the 8th resistance R 32 with dc power supply;
The 7th resistance R 31 of theft-resistant link chain unit and the two ends of the 5th capacitor C 31 are connected with emitter with the base stage of the 5th triode Q31 respectively; The two ends of the 6th capacitor C 32 and the 9th resistance R 33 are connected with the collector and emitter of the 5th triode Q31 respectively;
The collector electrode of the 6th triode Q32 is connected with the PWM control IC, grounded emitter, and base stage is connected with the collector electrode of the 5th triode Q31.
Further, the operation principle of foregoing circuit is:
When the led driver operate as normal, the former limit action of optical coupler ISO, 3 pin level are the high level near voltage VA, the 5th triode Q31 conducting, make the base stage of the 6th triode Q32 become low level state, the 6th triode Q32 by, so the theft-resistant link chain circuit is to the not influence of PWM control IC.
When fault occurs, the former limit open circuit of ISO, its 3 pin voltage transitions is a low level; The 5th triode Q31 is become by state by conducting state; Va (Va can be the power supply Vcc of PWM control IC, also can be the reference voltage Vref that PWM control IC itself produces) is just to 32 chargings of the 6th capacitor C, and its charging interval is by the time constant decision of the 8th resistance R 32 and the 6th capacitor C 32; After the 6th capacitor C 32 was full of electricity, the voltage at the 6th capacitor C 32 two ends was reduced to high level by low level; The 6th triode Q32 is by becoming conducting state by state; The respective pins B of PWM control IC is dragged down; The PWM ripple of PWM control IC output narrows down like this, thereby causes output voltage to reduce, and drops to when output voltage below the conducting voltage of LED load, and complete machine is in guard mode.
Preferably, the 8th resistance R 32 and the 6th capacitor C 32 can also play and guarantee in the led driver start-up course, the effect that the theft-resistant link chain circuit can misoperation.The 9th resistance R 33 guarantees the reliable break-make of the 6th triode Q32; The 7th resistance R 31 guarantees the reliable break-make of the 5th triode Q31.Wherein the 5th capacitor C 31 can guarantee that the theft-resistant link chain circuit can be to normal feedback generation influence.
Wherein 4 pin of optical coupler ISO link to each other with the respective pins A of PWM control IC.
Wherein the respective pins A of PWM control IC is meant the pin that links to each other with optical coupler, and the respective pins B of PWM control IC is meant the pin of theft-resistant link chain unit effect, and this pin is drawing current-mode can make the PWM control IC be in the no-output state.
Wherein the PWM control IC is divided into two classes, and a class is to do the chip of single-stage PFC, and another kind of is the chip that instead swashs type.
Chip for single-stage PFC type, L6562D with ST is an example, shown in Fig. 9 a, pin A just is meant 2 pin of L6562D, and pin B just is meant 2 pin of L6562D, and other are similar to the chip of L6562D, UCC28051 as TI company, UCC28811, the TDA4863 of Infineon company, TDA4863-2 etc. are same usages.For the anti-chip that swashs type, be example with UC2845, shown in Fig. 9 b, the A pin of its pwm chip just is meant 1 pin of UC2845, and the B pin of its pwm chip just is meant 1 pin of UC2845, and other are similar to the chip of UC2845, as UC2842, UC2843, UC2844 etc. are same usages.
Need to prove, foregoing circuit only is a kind of preferred embodiment of the present invention, the circuit of other realized above-mentioned functions below also will be provided, therefore, can not limit the present invention's interest field with the circuit that present embodiment provides, and, must belong to the scope that the present invention is contained according to the equal variation of foregoing circuit.
Referring to Figure 13, for another kind can be realized the circuit structure of theft-resistant link chain unit shown in Figure 11, can control the PWM control IC by the mode of irritating electric current, as shown in figure 13:
This theft-resistant link chain unit comprises: the tenth resistance R the 41, the 11 resistance R the 42, the 12 resistance R 43, the 7th capacitor C 41, the 8th capacitor C 42, the 7th triode Q41, the 8th triode Q42;
The low side of this optical coupler is connected with the base stage of the 7th triode Q41, and high-end and this PWM control IC of this optical coupler is connected; The collector electrode of the 7th triode Q41 of this theft-resistant link chain unit is connected the grounded emitter of the 7th triode Q41 by the 11 resistance R 42 with dc power supply;
The tenth resistance R 41 of this theft-resistant link chain unit and the two ends of the 7th capacitor C 41 are connected with emitter with the base stage of the 7th triode Q41 respectively; The two ends of the 8th capacitor C 42 and the 12 resistance R 43 are connected with the collector and emitter of the 7th triode Q41 respectively;
The collector electrode of the 8th triode Q42 is connected with power supply, and base stage is connected with the collector electrode of the 7th triode Q41, and emitter is connected with this PWM control IC.
Further, the operation principle of foregoing circuit is:
When the led driver operate as normal, the former limit action of optical coupler ISO, 3 pin level are the high level near voltage VA, the 7th triode Q41 conducting, make the base stage of the 8th triode Q42 become low level state, the 8th triode Q42 by, so the theft-resistant link chain circuit is to the not influence of PWM control IC.
When fault occurs, the former limit open circuit of ISO1, its 3 pin voltage transitions is a low level; The 7th triode Q41 is become by state by conducting state; Va (Va can be the power supply Vcc of PWM control IC, also can be the reference voltage Vref that PWM control IC itself produces) is just to 42 chargings of the 8th capacitor C, and its charging interval is by the time constant decision of the 11 resistance R 42 and the 8th capacitor C 42; After the 8th capacitor C 42 was full of electricity, the voltage at the 8th capacitor C 42 two ends was reduced to high level by low level; The 8th triode Q42 is by becoming conducting state by state; Va just irritates electric current by the 8th triode Q42 to the respective pins B of PWM control IC; The PWM ripple of PWM control IC output narrows down like this, thereby causes output voltage to reduce, and drops to when output voltage below the conducting voltage of LED load, and complete machine is in guard mode.
Wherein another effect of the 11 resistance R 42 and the 8th capacitor C 42 is exactly to guarantee in the led driver start-up course, and the theft-resistant link chain circuit can misoperation.The 12 resistance R 43 guarantees the reliable break-make of the 8th triode Q42; The tenth resistance R 41 guarantees the reliable break-make of the 7th triode Q41.The 7th capacitor C 41 guarantees that the theft-resistant link chain circuit can be to normal feedback generation influence.
The respective pins A of PWM control IC is meant the pin that links to each other with optical coupler, and the respective pins B of PWM control IC is meant the pin of theft-resistant link chain unit effect, and this pin can make the PWM control IC be in the no-output state at the filling current-mode.
Preferably, the PWM control IC is divided into two classes, and a class is to do the chip of single-stage PFC, and another kind of is the chip that instead swashs type.
Chip for single-stage PFC type, L6562D with ST is an example, shown in Fig. 9 a, pin A just is meant 2 pin of L6562D, and pin B just is meant 1 pin or 4 pin of L6562D, and other are similar to the chip of L6562D, UCC28051 as TI company, UCC28811, the TDA4863 of Infineon company, TDA4863-2 etc. are same usages.For the anti-chip that swashs type, with UC2845 is example, shown in Fig. 9 b, the A pin of its pwm chip just is meant 1 pin of UC2845, the B pin of its pwm chip just is meant 2 pin or 3 pin of UC2845, and other are similar to the chip of UC2845, as UC2842, UC2843, UC2844 etc. are same usages.
Need to prove that foregoing circuit only is a kind of preferred embodiment of the present invention, can not limit the present invention's interest field,, must belong to the scope that the present invention is contained according to the equal variation of foregoing circuit with the circuit that present embodiment provides.
The led driver and the theft-resistant link chain unit that provide in each enforcement of the present invention are adapted to various LED lamps.
Led driver that present embodiment provides and theft-resistant link chain unit can effectively solve the safety problem of led driver, the safety problem when particularly optical coupler breaks down.Simultaneously, that the led driver that present embodiment provides and theft-resistant link chain unit are realized is simple, with low cost, be particularly suitable for for small size, low cost, lower powered led driver, can effectively solve its problem at secure context.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
Above disclosed is a kind of preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.

Claims (14)

1. LED lamp failure processing method, when the led driver operate as normal, civil power is loaded into the former limit of transformer by the rectification circuit on the former limit of Switching Power Supply, and after the transformer transformation, the rectification circuit by the Switching Power Supply secondary is to LED lamp output DC;
Led driver is sampled to the direct current of the rectification circuit output of described Switching Power Supply secondary; And transmit to pulse width modulation (PWM) control integrated circuit IC by optical coupler; The PWM control IC by controlling the break-make of described switching tube, is adjusted the dc voltage of the rectification circuit output of described Switching Power Supply secondary according to the dc signal of sampling; It is characterized in that,
When described led driver operate as normal, whether sample to described optical coupler in the theft-resistant link chain unit, detect described optical coupler and break down;
When described theft-resistant link chain unit detected described optical coupler fault, the described PWM control IC of described theft-resistant link chain unit controls reduced the PWM ripple duty ratio of its output, reduces described transformer secondary voltage, makes described led driver be in guard mode.
2. LED lamp failure processing method as claimed in claim 1; it is characterized in that; when described theft-resistant link chain unit detects described optical coupler fault; the described PWM control IC of described theft-resistant link chain unit controls reduces the PWM ripple duty ratio of its output; reduce described transformer secondary voltage; make described led driver be in guard mode, comprising:
When described optical coupler fault, the described PWM control IC of described theft-resistant link chain unit controls reduces the PWM ripple duty ratio of its output;
Switching tube reduces the time of its conducting according to the PWM ripple duty ratio of PWM control IC output, and transformer original edge voltage ON time is shortened;
The dc voltage of the rectification circuit output of transformer secondary reduces;
When the dc voltage of the rectification circuit of described secondary output was lower than the conducting voltage of LED lamp, described led driver was in guard mode.
3. LED lamp failure processing method as claimed in claim 2 is characterized in that sampling to described optical coupler in the theft-resistant link chain unit, and the mode of controlling described PWM control IC comprises:
Sample the high-end of described optical coupler in the theft-resistant link chain unit, when detecting described optical coupler fault, described theft-resistant link chain unit draws electric current SOURCE CURRENT to the respective pin of described PWM control IC, makes described PWM control IC reduce the PWM ripple duty ratio of its output; Or
Sample the high-end of described optical coupler in the theft-resistant link chain unit, when detecting described optical coupler fault, electric current SINKCURRENT is irritated to the respective pin of described PWM control IC in described theft-resistant link chain unit, makes described PWM control IC reduce the PWM ripple duty ratio of its output; Or
Sample at the low side of described optical coupler in the theft-resistant link chain unit, when detecting described optical coupler fault, described theft-resistant link chain unit draws electric current to the respective pin of described PWM control IC, makes described PWM control IC reduce the PWM ripple duty ratio of its output; Or
Sample at the low side of described optical coupler in the theft-resistant link chain unit, when detecting described optical coupler fault, electric current is irritated to the respective pin of described PWM control IC in described theft-resistant link chain unit, makes described PWM control IC reduce the PWM ripple duty ratio of its output.
4. led driver comprises: transformer, be used for the voltage of outside input is carried out pressure regulation, and the former limit of described transformer links to each other with the rectification circuit on the former limit of Switching Power Supply, and the secondary of described transformer links to each other with the rectification circuit of Switching Power Supply secondary; Switching tube is used to control the break-make of described transformer original edge voltage; The rectification circuit on the former limit of Switching Power Supply is used for converting civil power to direct current; The rectification circuit of Switching Power Supply secondary is used for described transformer secondary is carried out rectification, and to LED lamp output DC; It is characterized in that described led driver also comprises:
Sampling unit is used for the direct current that the rectification circuit of described Switching Power Supply secondary is exported is sampled;
Optical coupler after being used for dc signal with the sampling of described sampling unit and carrying out the photoelectricity isolation processing, transmits to the PWM control IC by the theft-resistant link chain unit;
The PWM control IC is used for the dc signal according to the transmission of theft-resistant link chain unit, by controlling the break-make of described switching tube, adjusts the dc voltage of the rectification circuit output of described Switching Power Supply secondary;
The theft-resistant link chain unit; be connected between described optical coupler and the described PWM control IC; be used for described optical coupler is carried out sample detecting; when described optical coupler fault; reduce the PWM ripple duty ratio of described PWM control IC output; described transformer secondary voltage is reduced, and led driver is in guard mode.
5. led driver as claimed in claim 4 is characterized in that, the PWM ripple duty ratio that described PWM control IC reduces its output is controlled in the theft-resistant link chain unit when described optical coupler fault; Then
Described switching tube reduces according to the PWM ripple duty ratio of PWM control IC output, thereby reduces the ON time of described switching tube; The transformer secondary reduces through the dc voltage of the rectification circuit output of Switching Power Supply secondary; When the dc voltage of the rectification circuit of described Switching Power Supply secondary output was lower than the conducting voltage of LED lamp, described led driver was in guard mode.
6. led driver as claimed in claim 5 is characterized in that, described theft-resistant link chain unit one end is connected with the high-end of described optical coupler, and the other end is connected with described PWM control IC; The low side of described optical coupler is connected with described PWM control IC;
Sample the high-end of described optical coupler in described theft-resistant link chain unit; when detecting described optical coupler fault; described PWM control IC is drawn electric current SOURCE CURRENT; make described PWM control IC reduce the PWM ripple duty ratio of its output; described transformer secondary voltage is reduced, and led driver is in guard mode.
7. led driver as claimed in claim 6, it is characterized in that described theft-resistant link chain unit comprises: first resistance (R11), second resistance (R12), the 3rd resistance (R13), first electric capacity (C11), second electric capacity (C12), first triode (Q11), second triode (Q12) and first diode (D11);
The high-end base stage with first triode (Q11) of described optical coupler is connected, and the low side of described optical coupler is connected with described PWM control IC;
The emitter of described theft-resistant link chain unit first triode (Q11) is connected with dc power supply, and the two ends of first resistance (R11) and first electric capacity (C11) are connected with emitter with the base stage of first triode (Q11) respectively; The two ends of second electric capacity (C12) are connected with the collector and emitter of first triode (Q11); The collector electrode of first triode (Q11) is by second resistance (R12) ground connection;
The grounded collector of second triode (Q12), base stage is connected with the collector electrode of first triode (Q11); The two ends of the 3rd resistance (R13) are connected with emitter with the base stage of second triode (Q12) respectively; The negative electrode of first diode (D11) is connected with the emitter of second triode (Q12); The anode of first diode (D11) is connected with described PWM control IC.
8. led driver as claimed in claim 5 is characterized in that, described theft-resistant link chain unit one end is connected with the high-end of described optical coupler, and the other end is connected with described PWM control IC; The low side of described optical coupler is connected with described PWM control IC;
Sample the high-end of described optical coupler in described theft-resistant link chain unit; when detecting described optical coupler fault; described PWM control IC is irritated electric current SINK CURRENT; make described PWM control IC reduce the PWM ripple duty ratio of its output; described transformer secondary voltage is reduced, and led driver is in guard mode.
9. led driver as claimed in claim 8, it is characterized in that described theft-resistant link chain unit comprises: the 4th resistance (R21), the 5th resistance (R22), the 6th resistance (R23), the 3rd electric capacity (C21), the 4th electric capacity (C22), the 3rd triode (Q21), the 4th triode (Q22) and second diode (D21);
The high-end base stage with the 3rd triode (Q21) of described optical coupler is connected, and the low side of described optical coupler is connected with described PWM control IC;
The emitter of described theft-resistant link chain unit the 3rd triode (Q21) is connected with dc power supply, and the two ends of the 4th resistance (R21) and the 3rd electric capacity (C21) are connected with emitter with the base stage of the 3rd triode (Q21) respectively; The two ends of the 4th electric capacity (C22) are connected with the collector and emitter of the 3rd triode (Q21); The collector electrode of the 3rd triode (Q21) is by the 5th resistance (R22) ground connection;
The collector electrode of the 4th triode (Q22) is connected with described PWM control IC, and emitter is connected with the emitter of the 3rd triode (Q21); The base stage of the 4th triode (Q22) is connected with the anode of second diode (D21), and the collector electrode of negative electrode the 3rd triode (Q21) of second diode (D21) connects; The two ends of the 6th resistance (R23) are connected with emitter with the base stage of the 4th triode (Q22) respectively.
10. led driver as claimed in claim 5 is characterized in that, described theft-resistant link chain unit one end is connected with the low side of described optical coupler, and the other end is connected with described PWM control IC; High-end and the described PWM control IC of described optical coupler is connected;
Sample at the low side of described optical coupler in described theft-resistant link chain unit; when detecting described optical coupler fault; described PWM control IC is drawn electric current; make described PWM control IC reduce the PWM ripple duty ratio of its output; described transformer secondary voltage is reduced, and led driver is in guard mode.
11. led driver as claimed in claim 10, it is characterized in that described theft-resistant link chain unit comprises: the 7th resistance (R31), the 8th resistance (R32), the 9th resistance (R33), the 5th electric capacity (C31), the 6th electric capacity (C32), the 5th triode (Q31), the 6th triode (Q32);
The low side of described optical coupler is connected with the base stage of the 5th triode (Q31), and the high-end and described PWM control IC of described optical coupler is connected; The collector electrode of the 5th triode (Q31) of described theft-resistant link chain unit is connected the grounded emitter of the 5th triode (Q31) by the 8th resistance (R32) with dc power supply;
The 7th resistance (R31) of described theft-resistant link chain unit is connected with emitter with the base stage of the 5th triode (Q31) respectively with the two ends of the 5th electric capacity (C31); The two ends of the 6th electric capacity (C32) and the 9th resistance (R33) are connected with the collector and emitter of the 5th triode (Q31) respectively;
The collector electrode of the 6th triode (Q32) is connected with described PWM control IC, grounded emitter, and base stage is connected with the collector electrode of the 5th triode (Q31).
12. led driver as claimed in claim 5 is characterized in that, described theft-resistant link chain unit one end is connected with the low side of described optical coupler, and the other end is connected with described PWM control IC; High-end and the described PWM control IC of described optical coupler is connected;
Sample at the low side of described optical coupler in described theft-resistant link chain unit; when detecting described optical coupler fault; described PWM control IC is irritated electric current; make described PWM control IC reduce the PWM ripple duty ratio of its output; described transformer secondary voltage is reduced, and led driver is in guard mode.
13. led driver as claimed in claim 12, it is characterized in that described theft-resistant link chain unit comprises: the tenth resistance (R41), the 11 resistance (R42), the 12 resistance (R43), the 7th electric capacity (C41), the 8th electric capacity (C42), the 7th triode (Q41), the 8th triode (Q42);
The low side of described optical coupler is connected with the base stage of the 7th triode (Q41), and the high-end and described PWM control IC of described optical coupler is connected; The collector electrode of the 7th triode (Q41) of described theft-resistant link chain unit is connected the grounded emitter of the 7th triode (Q41) by the 11 resistance (R42) with dc power supply;
The tenth resistance (R41) of described theft-resistant link chain unit is connected with emitter with the base stage of the 7th triode (Q41) respectively with the two ends of the 7th electric capacity (C41); The two ends of the 8th electric capacity (C42) and the 12 resistance (R43) are connected with the collector and emitter of the 7th triode (Q41) respectively;
The collector electrode of the 8th triode (Q42) is connected with dc power supply, and base stage is connected with the collector electrode of the 7th triode (Q41), and emitter is connected with described PWM control IC.
14. a LED lamp is characterized in that, comprises as each described led driver in the claim 4 to 14.
CN2010102116748A 2010-06-25 2010-06-25 LED (light emitting diode) lamp fault processing method, LED driver and LED lamp Active CN101873750B (en)

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CN102709880A (en) * 2012-06-07 2012-10-03 无锡市晶源微电子有限公司 Module with optocoupler protection function
CN104582194A (en) * 2015-01-20 2015-04-29 浙江大学 Single-power-key time delay state control PWM dimming circuit used for LED driver
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CN115219158A (en) * 2022-07-18 2022-10-21 中国南方电网有限责任公司超高压输电公司广州局 Thyristor converter valve detection circuit and method thereof
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CN115219158B (en) * 2022-07-18 2024-04-02 中国南方电网有限责任公司超高压输电公司广州局 Thyristor converter valve detection circuit and method thereof

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