CN101873750B - 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 PDFInfo
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- CN101873750B CN101873750B CN2010102116748A CN201010211674A CN101873750B CN 101873750 B CN101873750 B CN 101873750B CN 2010102116748 A CN2010102116748 A CN 2010102116748A CN 201010211674 A CN201010211674 A CN 201010211674A CN 101873750 B CN101873750 B CN 101873750B
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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
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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]
- H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- 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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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
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
Due to the great function of LED lamp in energy-saving and emission-reduction, the LED industrial growth was rapid in recent years, in the Landscape Lighting field, had obtained more and more wider application.Some developed countries (such as Japan and Germany etc.), the LED lamp has been come into supermarket, has entered into usual common people's family.
Be accompanied by the fast development of LED industry, the standard relevant to 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 affects 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% be all from LED driver, so the quality of LED driver is directly connected to the useful life of whole LED lamp.
In order to meet the requirement of LED streetlamp energy-saving environmental protection, LED driver generally adopts Switching Power Supply, with conventional lamp, compares, and it is high that Switching Power Supply has efficiency, power factor (Power Factor) height, the 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, the General Requirements LED driver adopts isolated form.For the small power LED illumination product, the general use of its isolated form LED driver instead swashed (Flyback) and single-stage PFC (1-Stage PFC) topology, wherein preferably single-stage PFC is topological, because it is simple that it has a circuit structure, with low cost, the advantages such as power factor is high, and total harmonic component is little.Theory diagram such as Fig. 1 of single-stage PFC show: the rectification circuit on the civil power input process former limit of 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 integration circuit (IC, Integrated Circuit) by optical coupler, thereby form negative feedback.
But the inventor finds in implementing process of the present invention, and there is open defect in above-mentioned LED driver:
Have a test to be in the certification test (for example UL) of LED secure context: while detecting the optical coupler open circuit, whether LED driver meets demand for security.If in test, the LED driver power output reduces, it is qualified to be judged to be.If power output increases, required before LED driver damages, the temperature rise of its safety device (for example transformer) can not surpass limit value.
For circuit common, during the optical coupler open circuit, output voltage rises, and can carry out the design protection circuit by the change in voltage that detects the transformer primary side winding.And for LED driver, because its load is the LED lamp, the LED driver output voltage is due to the clamper that is subjected to the LED load (characteristic 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, the way that generally can expect is to increase a current foldback circuit, but this need to increase an extra optical coupler and realize, has greatly increased design cost.Simultaneously,, for LED fluorescent lamp and the such occasion of bulb lamp, because its size is especially little, the restriction of LED driver volume is only allowed to exist an optical coupler.
Summary of the invention
Embodiment of the present 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, for small size, low cost, lower powered LED driver, be particularly suitable for, and can effectively solve its problem at secure context.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of LED lamp failure processing method, when LED driver works, civil power is loaded into transformer primary side by the rectification circuit on the former limit of Switching Power Supply, after the transformer transformation, by the rectification circuit with the 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 control IC by optical coupler to PWM and transmit; PWM controls the dc signal of IC according to sampling,, by controlling the break-make of described switching tube, adjusts the dc voltage of the rectification circuit output of described Switching Power Supply secondary.
When described LED driver normal operation, 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 inspection arrived described optical coupler fault, the described PWM of described theft-resistant link chain unit controls controlled IC and reduces the PWM ripple duty ratio of its output, reduces described transformer secondary voltage, makes described LED driver be in guard mode; Switching tube is controlled the PWM ripple duty ratio of IC output according to PWM, reduce the time of its conducting, makes transformer primary side voltage turn-on time shorten.
Wherein, when described theft-resistant link chain unit inspection arrived described optical coupler fault, the described PWM of described theft-resistant link chain unit controls controlled IC and reduces 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 of described theft-resistant link chain unit controls controls IC and reduces the PWM ripple duty ratio of its output;
The dc voltage of the rectification circuit output of transformer secondary reduces;
During lower than the conducting voltage of LED lamp, described LED driver is in guard mode when the dc voltage of the rectification circuit of described secondary output.
Wherein, sample to described optical coupler in the theft-resistant link chain unit, and control the mode that described PWM controls IC and comprise:
Sample the high-end of described optical coupler in the theft-resistant link chain unit, when described optical coupler fault being detected, described theft-resistant link chain unit draws electric current (SOURCE CURRENT) to the respective pin that described PWM controls IC, makes described PWM control IC and reduces 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 described optical coupler fault being detected, electric current (SINK CURRENT) is filled with to the respective pin that described PWM controls IC in described theft-resistant link chain unit, makes described PWM control IC and reduces 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 described optical coupler fault being detected, described theft-resistant link chain unit draws electric current to the respective pin that described PWM controls IC, makes described PWM control IC and 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 described optical coupler fault being detected, electric current is filled with to the respective pin that described PWM controls IC in described theft-resistant link chain unit, makes described PWM control IC and reduce the PWM ripple duty ratio of its output.
Correspondingly, the embodiment of the present 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 is connected with the rectification circuit on the former limit of Switching Power Supply, and the secondary of described transformer is connected with the rectification circuit of Switching Power Supply secondary; Switching tube, for the break-make of controlling described transformer primary polygonal voltage; The rectification circuit on the former limit of Switching Power Supply, be used for converting civil power to direct current; The rectification circuit of Switching Power Supply secondary, be 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, be 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 the dc signal of described sampling unit sampling is carried out the photoelectricity isolation processing, controlling IC by the theft-resistant link chain unit to PWM and transmit;
PWM controls IC, is used for the dc signal that transmits according to the 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, being connected in described optical coupler and described PWM controls between IC, be used for described optical coupler is carried out sample detecting, when described optical coupler fault, reduce the PWM ripple duty ratio that described PWM controls IC output, described transformer secondary voltage is reduced, and LED driver is in guard mode; Described switching tube is controlled the reducing of PWM ripple duty ratio of IC output according to PWM, thereby reduces the ON time of described switching tube.
Wherein, the theft-resistant link chain unit when described optical coupler fault, is controlled described PWM control IC and is reduced the PWM ripple duty ratio of its output;
The transformer secondary reduces through the dc voltage of the rectification circuit output of Switching Power Supply secondary; During lower than the conducting voltage of LED lamp, described LED driver is in guard mode when the dc voltage of the rectification circuit of described Switching Power Supply secondary output.
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 controlled IC with described PWM and is connected; The low side of described optical coupler is controlled IC with described PWM and is connected;
Sample the high-end of described optical coupler in described theft-resistant link chain unit; when described optical coupler fault being detected; described PWM is controlled IC draw electric current; make described PWM control IC and 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 first resistance R 11, the second resistance R 12, the 3rd resistance R 13, the first capacitor C 11, the 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 controlled IC with described PWM and is connected;
The emitter of described theft-resistant link chain unit the first triode Q11 is connected with dc power supply, the first resistance R 11 be connected the two ends of capacitor C 11 and be connected with emitter with the base stage of the first triode Q11 respectively; The two ends of the 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 the 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 controlled IC with described PWM and is connected.
Wherein, separately planting 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 controlled IC with described PWM and is connected; The low side of described optical coupler is controlled IC with described PWM and is connected;
Sample the high-end of described optical coupler in described theft-resistant link chain unit; when described optical coupler fault being detected; described PWM is controlled IC fill with electric current; make described PWM control IC and 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 controlled IC with described PWM and is connected;
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 controls IC with described PWM and is connected, and emitter is connected with the emitter of the 3rd triode Q21; The anodic bonding of the base stage of the 4th triode Q22 and the second diode D21, 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, separately planting theft-resistant link chain unit implementation is: theft-resistant link chain unit one end is connected with the low side of described optical coupler, and the other end is controlled IC with described PWM and is connected; High-end and the described PWM of described optical coupler controls IC and is connected;
Sample at the low side of described optical coupler in described theft-resistant link chain unit; when described optical coupler fault being detected; described PWM is controlled IC draw electric current; make described PWM control IC and 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 of described optical coupler controls IC and is connected; The collector electrode of the 5th triode Q31 of described theft-resistant link chain unit is connected with dc power supply by the 8th resistance R 32, the grounded emitter of the 5th triode Q31;
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 controls IC with described PWM and is connected, grounded emitter, and base stage is connected with the collector electrode of the 5th triode Q31.
Wherein, separately planting theft-resistant link chain unit implementation is: theft-resistant link chain unit one end is connected with the low side of described optical coupler, and the other end is controlled IC with described PWM and is connected; High-end and the described PWM of described optical coupler controls IC and is connected;
Sample at the low side of described optical coupler in described theft-resistant link chain unit; when described optical coupler fault being detected; described PWM is controlled IC fill with electric current; make described PWM control IC and 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 41, the 11 resistance R 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 of described optical coupler controls IC and is connected; The collector electrode of the 7th triode Q41 of described theft-resistant link chain unit is connected with dc power supply by the 11 resistance R 42, the grounded emitter of the 7th triode Q41;
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 controlled IC with described PWM and is connected.
Simultaneously, the embodiment of the present invention also provides a kind of LED lamp, and this LED lamp adopts above-mentioned LED driver.
Implement the embodiment of the present 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, for small size, low cost, lower powered LED driver, be particularly suitable for, and can effectively solve its problem at secure context.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
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 flow process schematic diagram;
Fig. 4 is LED lamp failure processing method the first embodiment schematic flow sheet provided by the invention;
Fig. 5 is LED lamp failure processing method the second embodiment schematic flow sheet provided by the invention;
Fig. 6 is LED driver example structure schematic diagram provided by the invention;
Fig. 7 is theft-resistant link chain unit the first example structure schematic diagram in 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 that PWM controls 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 theft-resistant link chain unit the second example structure schematic diagram in 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 present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment that obtains, belong to the scope of protection of the invention.
, 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-drop loading is arrived transformer primary side.
, 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 the backward LED lamp output of direct current with current commutates.
, referring to Fig. 3, be existing LED driver FEEDBACK CONTROL flow process schematic diagram.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, control IC by optical coupler to PWM and transmit the current and voltage signals of sampling.
At step S302, PWM controls the dc signal of IC according to sampling, adjusts the pulsewidth of the PWM ripple of its output.
At step S303, switching tube, according to the break-make of the pulse width control transformer primary polygonal voltage of PWM ripple, is adjusted the dc voltage of the rectification circuit output of described Switching Power Supply secondary.
Referring to Fig. 4, be LED lamp failure processing method the first embodiment schematic flow sheet provided by the invention, as shown in the figure:
Whether at step S400, when LED driver works, sample to described optical coupler in the theft-resistant link chain unit, detect optical coupler and break down, and, if do not break down, performs step S401; , if break down, perform step S402.
At step S401, when optical coupler was normal, the theft-resistant link chain unit did not process to the current signal that PWM controls the IC transmission described optical coupler.
At step S402, during to the optical coupler fault, described theft-resistant link chain unit controls PWM controls IC and reduces the PWM ripple duty ratio of its output at the theft-resistant link chain unit inspection.
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 present 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 LED lamp failure processing method the 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 LED driver works, sample to described optical coupler in the theft-resistant link chain unit, detect optical coupler and break down., if do not break down, perform step S501; , if break down, perform step S502.
At step S501, when optical coupler was normal, the theft-resistant link chain unit did not process to the current signal that PWM controls the IC transmission described optical coupler.
At step S502, when described theft-resistant link chain unit inspection arrived described optical coupler fault, theft-resistant link chain unit controls PWM controlled IC and reduces the PWM ripple duty ratio of its output.
At step S503, switching tube is controlled the PWM ripple duty ratio of IC output according to PWM, reduces the time of its conducting, makes transformer primary side voltage turn-on time shorten.
At step S504, the transformer secondary reduces through the dc voltage of the rectification circuit output of Switching Power Supply secondary.
At step S505, during lower than the conducting voltage of LED lamp, LED driver enters guard mode when the galvanic voltage of the rectification circuit of Switching Power Supply secondary output.
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 the optical coupler fault being detected, the theft-resistant link chain unit is controlled IC to PWM and is drawn electric current, makes PWM control IC and reduces 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 the optical coupler fault being detected, the theft-resistant link chain unit is controlled IC to PWM and is filled with electric current, makes PWM control IC and reduces 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 the optical coupler fault being detected, the theft-resistant link chain unit is controlled IC to PWM and is drawn electric current, makes PWM control IC and reduces 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 the optical coupler fault being detected, the theft-resistant link chain unit is controlled IC to PWM and is filled with electric current, makes PWM control IC and reduces 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 present 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 the present embodiment provides can be realized aforesaid LED lamp failure processing method, as shown in the figure, this LED driver comprises:
Transformer 1, be used for the voltage of outside input is carried out pressure regulation, and the former limit of described transformer is connected with the rectification circuit 2 on the former limit of Switching Power Supply, and the secondary of described transformer is connected with the rectification circuit 3 of Switching Power Supply secondary; The rectification circuit 2 on the former limit of Switching Power Supply, be used for civil power is become direct current; Switching tube 9, control the break-make of described transformer 1 original edge voltage; The rectification circuit 3 of Switching Power Supply secondary, be 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, be used for the direct current that the rectification circuit 3 of described Switching Power Supply secondary is exported is sampled;
PWM controls IC 8, is used for the dc signal that transmits according to described theft-resistant link chain unit 7,, 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; being connected in described optical coupler 6 and described PWM controls between IC8; be used for described optical coupler 6 is carried out sample detecting; when described optical coupler 6 fault; reduce the PWM ripple duty ratio that described PWM controls IC8 output; described transformer 1 secondary voltage is reduced, and LED driver is in guard mode.
More specifically, theft-resistant link chain unit 7 when optical coupler 6 fault, is controlled PWM control IC8 and is reduced the PWM ripple duty ratio of its output; Switching tube 9 is controlled the minimizing of the PWM ripple duty ratio of IC8 output according to PWM, reduce the ON time of switching tube 9 self, thereby reduce 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; During lower than the conducting voltage of LED load 4, LED driver is in guard mode when the dc voltage of rectification circuit 3 output of Switching Power Supply secondary.
The LED driver that the present embodiment provides can effectively solve the safety problem of LED driver, the safety problem when particularly optical coupler breaks down.Simultaneously, that the LED driver that the present embodiment provides is realized is simple, with low cost, for small size, low cost, lower powered LED driver, be particularly suitable for, and can effectively solve its problem at secure context.
, referring to Fig. 7, be theft-resistant link chain unit the first example structure schematic diagram in 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 controlled IC8 with PWM and is connected; The low side of optical coupler 6 is controlled IC 8 with PWM and is connected;
Sample the high-end of optical coupler 6 in theft-resistant link chain unit 7; when optical coupler 6 fault being detected, PWM is controlled IC8 draw electric current or fill with electric current, make PWM control IC8 and 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, be a kind of circuit structure of realizing theft-resistant link chain unit shown in Figure 7, can control PWM by the mode of drawing electric current and control IC, as shown in Figure 8:
This theft-resistant link chain unit comprises: the first resistance R 11, the second resistance R 12, the 3rd resistance R 13, the first capacitor C 11, the 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 controlled IC with PWM and is connected.
The emitter of theft-resistant link chain unit the first triode Q11 is connected with dc power supply, the first resistance R 11 be connected the two ends of capacitor C 11 and be connected with emitter with the base stage of the first triode Q11 respectively; The two ends of the 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 the 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 controlled IC with PWM and is connected.
Further, the operation principle of foregoing circuit is:
LED driver is when normal operation, 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 high level, due to the one-way conduction characteristic of diode, so not impact of IC is controlled to PWM in the theft-resistant link chain unit.
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 the second capacitor C 12 chargings, and the time constant of its charging interval by the second resistance R 12 and the second capacitor C 12 determines; After the second capacitor C 12 was full of electricity, the voltage at the second resistance R 12 two ends was reduced to low level by high level; The second triode Q12 is by by state, becoming conducting state; The respective pins B that PWM is controlled IC drags 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 the second resistance R 12 and the 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 fills with electric current; The 3rd resistance R 13 is to guarantee the second triode Q12 reliable on off; The first resistance R 11 is to guarantee the first triode Q11 reliable on off.The first capacitor C 11 is in order to guarantee that the theft-resistant link chain circuit can be on normal feedback generation impact.
3 pin of optical coupler are connected with the respective pins A that PWM controls IC.Wherein the respective pins A of PWM control IC refers to the pin that is connected 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 PWM control IC be in the no-output state.
Preferably, the IC of PWM control in the present embodiment is divided into two classes, and a class is to do the chip of single-stage PFC, and another kind of is the anti-chip that swashs type.
Chip for single-stage PFC type, take the L6562D of ST as example, as shown in Fig. 9 a, pin A just refers to 1 pin of L6562D, and pin B just refers to 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, take UC2845 as example, as shown in Fig. 9 b, the A pin of its PWM control IC just refers to 2 pin of UC2845, and the B pin of its PWM control IC just refers to 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 equally above-mentioned functions below also will be provided, therefore, can not limit with the circuit that the present embodiment provides the present invention's interest field, and, according to the equal variation of foregoing circuit, must belong to the scope that the present invention is contained.
Referring to Figure 10, can realize the circuit structure of theft-resistant link chain unit shown in Figure 7 for another kind, can control PWM by the mode of filling with electric current and control IC, 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 controlled IC with this PWM and is connected.
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 controls IC with this PWM and is connected, and emitter is connected with the emitter of the 3rd triode Q21; The anodic bonding of the base stage of the 4th triode Q22 and the second diode D21, 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 when normal operation, and 4 pin of optical coupler ISO drag down, and the 3rd triode Q21 conducting, make the negative electrode of the second diode D21 become high level state, the 4th triode Q22 by, this moment, this circuit was controlled not impact of IC to PWM.
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; Va is just to the 4th capacitor C 22 chargings, and the time constant of its charging interval by the 5th resistance R 22 and the 4th capacitor C 22 determines; 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 by state, becoming conducting state; Va will fill with electric current to the respective pins B that PWM controls 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 4th triode Q22 reliable on off; The 4th resistance R 21 is to guarantee the 3rd triode Q21 reliable on off.
Wherein the 3rd capacitor C 21 is in order to guarantee that the theft-resistant link chain circuit can be on normal feedback generation impact.
Wherein 3 pin of optical coupler ISO are connected with the respective pins A that PWM controls IC.
Wherein the respective pins A of PWM control IC refers to the pin that is connected with optical coupler, and the respective pins B of PWM control IC refers to the pin of theft-resistant link chain unit effect, and this pin can make PWM control IC be in the no-output state at the filling current-mode.
Preferably, the IC of PWM control in the present embodiment is divided into two classes, and a class is to do the chip of single-stage PFC, and another kind of is the anti-chip that swashs type.
Chip for single-stage PFC type, take the L6562D of ST as example, as shown in Fig. 9 a, pin A just refers to 1 pin of L6562D, and pin B just refers to 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, take UC2845 as example, as shown in Fig. 9 b, the A pin of its PWM control IC just refers to 2 pin of UC2845, the B pin of its PWM control IC just refers to 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 equally above-mentioned functions below also will be provided, therefore, can not limit with the circuit that the present embodiment provides the present invention's interest field, and, according to the equal variation of foregoing circuit, must belong to the scope that the present invention is contained.
The LED driver that the 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 the present embodiment provides and theft-resistant link chain unit are realized is simple, with low cost, for small size, low cost, lower powered LED driver, be particularly suitable for, and can effectively solve its problem at secure context.
, referring to Figure 11, be theft-resistant link chain unit the second example structure schematic diagram in 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 controlled IC8 with PWM and is connected; High-end and the PWM of optical coupler 6 controls IC8 and is connected;
Sample at the low side of optical coupler 6 in theft-resistant link chain unit 7; when optical coupler 6 fault being detected, PWM is controlled IC8 draw electric current or fill with electric current, make PWM control IC8 and 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, be a kind of circuit structure of realizing theft-resistant link chain unit shown in Figure 11, can control PWM by the mode of drawing electric current and control IC, 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 of optical coupler controls IC and is connected; The collector electrode of the 5th triode Q31 of theft-resistant link chain unit is connected with dc power supply by the 8th resistance R 32, the grounded emitter of the 5th triode Q31;
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 controls IC with PWM and is connected, 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 LED driver works, 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 controlled not impact of IC to PWM.
When fault occurs, the former limit open circuit of ISO, its 3 pin voltage transitions is low level; The 5th triode Q31 is become by state by conducting state; Va (Va can be the power supply Vcc that PWM controls IC, can be also that PWM controls the reference voltage Vref that IC itself produces) is just to the 6th capacitor C 32 chargings, and the time constant of its charging interval by the 8th resistance R 32 and the 6th capacitor C 32 determines; 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 by state, becoming conducting state; The respective pins B that PWM is controlled IC drags 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 6th triode Q32 reliable on off; The 7th resistance R 31 guarantees the 5th triode Q31 reliable on off.Wherein the 5th capacitor C 31 can guarantee that the theft-resistant link chain circuit can be on normal feedback generation impact.
Wherein 4 pin of optical coupler ISO are connected with the respective pins A that PWM controls IC.
Wherein the respective pins A of PWM control IC refers to the pin that is connected with optical coupler, and the respective pins B of PWM control IC refers to the pin of theft-resistant link chain unit effect, and this pin is drawing current-mode can make PWM control IC be in the no-output state.
Wherein 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 anti-chip that swashs type.
Chip for single-stage PFC type, take the L6562D of ST as example, as shown in Fig. 9 a, pin A just refers to 2 pin of L6562D, and pin B just refers to 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, take UC2845 as example, as shown in Fig. 9 b, the A pin of its pwm chip just refers to 1 pin of UC2845, and the B pin of its pwm chip just refers to 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 with the circuit that the present embodiment provides the present invention's interest field, and, according to the equal variation of foregoing circuit, must belong to the scope that the present invention is contained.
Referring to Figure 13, can realize the circuit structure of theft-resistant link chain unit shown in Figure 11 for another kind, can control PWM by the mode of filling with electric current and control IC, as shown in figure 13:
This theft-resistant link chain unit comprises: the tenth resistance R 41, the 11 resistance R 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 of this optical coupler controls IC and is connected; The collector electrode of the 7th triode Q41 of this theft-resistant link chain unit is connected with dc power supply by the 11 resistance R 42, the grounded emitter of the 7th triode Q41;
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 controlled IC with this PWM and is connected.
Further, the operation principle of foregoing circuit is:
When LED driver works, 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 controlled not impact of IC to PWM.
When fault occurs, the former limit open circuit of ISO1, its 3 pin voltage transitions is low level; The 7th triode Q41 is become by state by conducting state; Va (Va can be the power supply Vcc that PWM controls IC, can be also that PWM controls the reference voltage Vref that IC itself produces) is just to the 8th capacitor C 42 chargings, and the time constant of its charging interval by the 11 resistance R 42 and the 8th capacitor C 42 determines; 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 by state, becoming conducting state; Va just fills with electric current by the 8th triode Q42 to the respective pins B that PWM controls 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 8th triode Q42 reliable on off; The tenth resistance R 41 guarantees the 7th triode Q41 reliable on off.The 7th capacitor C 41 guarantees that the theft-resistant link chain circuit can be on normal feedback generation impact.
The respective pins A that PWM controls IC refers to the pin that is connected with optical coupler, and the respective pins B of PWM control IC refers to the pin of theft-resistant link chain unit effect, and this pin can make PWM control IC be in the no-output state at the filling current-mode.
Preferably, PWM controls IC and is divided into two classes, and a class is to do the chip of single-stage PFC, and another kind of is the anti-chip that swashs type.
Chip for single-stage PFC type, take the L6562D of ST as example, as shown in Fig. 9 a, pin A just refers to 2 pin of L6562D, and pin B just refers to 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, take UC2845 as example, as shown in Fig. 9 b, the A pin of its pwm chip just refers to 1 pin of UC2845, the B pin of its pwm chip just refers to 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, can not limit with the circuit that the present embodiment provides the present invention's interest field,, according to the equal variation of foregoing circuit, must belong to the scope that the present invention is contained.
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.
The LED driver that the 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 the present embodiment provides and theft-resistant link chain unit are realized is simple, with low cost, for small size, low cost, lower powered LED driver, be particularly suitable for, and 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 above-described embodiment method, to come the relevant hardware of instruction to complete by computer program, described program can be stored in a computer read/write memory medium, this program when carrying out, can comprise the flow process as the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above disclosed is only a kind of preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore according to the claims in the present invention, doing, still belong to the scope that the present invention is contained.
Claims (14)
1. LED lamp failure processing method, when LED driver worked, civil power was loaded into transformer primary side 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 by optical coupler, to pulse width modulation (PWM) control integration IC circuit, transmit; PWM controls the dc signal of IC according to sampling,, by controlling the break-make of described switching tube, adjusts the dc voltage of the rectification circuit output of described Switching Power Supply secondary; It is characterized in that,
When described LED driver normal operation, 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 inspection arrived described optical coupler fault, the described PWM of described theft-resistant link chain unit controls controlled IC and reduces the PWM ripple duty ratio of its output, reduces described transformer secondary voltage, makes described LED driver be in guard mode; Switching tube is controlled the PWM ripple duty ratio of IC output according to PWM, reduce the time of its conducting, makes transformer primary side voltage turn-on time shorten.
2. LED lamp failure processing method as claimed in claim 1; it is characterized in that; when described theft-resistant link chain unit inspection arrives described optical coupler fault; the described PWM of described theft-resistant link chain unit controls controls IC and 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 of described theft-resistant link chain unit controls controls IC and reduces the PWM ripple duty ratio of its output;
The dc voltage of the rectification circuit output of transformer secondary reduces;
During lower than the conducting voltage of LED lamp, described LED driver is in guard mode when the dc voltage of the rectification circuit of described secondary output.
3. LED lamp failure processing method as claimed in claim 2, is characterized in that, samples to described optical coupler in the theft-resistant link chain unit, and control the mode that described PWM controls IC and comprise:
Sample the high-end of described optical coupler in the theft-resistant link chain unit, when described optical coupler fault being detected, described theft-resistant link chain unit draws electric current SOURCECURRENT to the respective pin that described PWM controls IC, makes described PWM control IC and reduces 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 described optical coupler fault being detected, electric current SINKCURRENT is filled with to the respective pin that described PWM controls IC in described theft-resistant link chain unit, makes described PWM control IC and reduces 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 described optical coupler fault being detected, described theft-resistant link chain unit draws electric current to the respective pin that described PWM controls IC, makes described PWM control IC and 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 described optical coupler fault being detected, electric current is filled with to the respective pin that described PWM controls IC in described theft-resistant link chain unit, makes described PWM control IC and 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 is connected with the rectification circuit on the former limit of Switching Power Supply, and the secondary of described transformer is connected with the rectification circuit of Switching Power Supply secondary; Switching tube, for the break-make of controlling described transformer primary polygonal voltage; The rectification circuit on the former limit of Switching Power Supply, be used for converting civil power to direct current; The rectification circuit of Switching Power Supply secondary, be 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, be 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 the dc signal of described sampling unit sampling is carried out the photoelectricity isolation processing, controlling IC by the theft-resistant link chain unit to PWM and transmit;
PWM controls IC, is used for the dc signal that transmits according to the 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, being connected in described optical coupler and described PWM controls between IC, be used for described optical coupler is carried out sample detecting, when described optical coupler fault, reduce the PWM ripple duty ratio that described PWM controls IC output, described transformer secondary voltage is reduced, and LED driver is in guard mode; Described switching tube is controlled the reducing of PWM ripple duty ratio of IC output according to PWM, thereby reduces the ON time of described switching tube.
5. LED driver as claimed in claim 4, is characterized in that, the theft-resistant link chain unit when described optical coupler fault, is controlled described PWM control IC and reduced the PWM ripple duty ratio of its output;
The transformer secondary reduces through the dc voltage of the rectification circuit output of Switching Power Supply secondary; During lower than the conducting voltage of LED lamp, described LED driver is in guard mode when the dc voltage of the rectification circuit of described Switching Power Supply secondary output.
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 controlled IC with described PWM and is connected; The low side of described optical coupler is controlled IC with described PWM and is connected;
Sample the high-end of described optical coupler in described theft-resistant link chain unit; when described optical coupler fault being detected; described PWM is controlled IC draw electric current SOURCE CURRENT; make described PWM control IC and 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: the first resistance (R11), the second resistance (R12), the 3rd resistance (R13), the first electric capacity (C11), the second electric capacity (C12), 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 controlled IC with described PWM and is connected;
The emitter of described theft-resistant link chain unit the first triode (Q11) is connected with dc power supply, the first resistance (R11) be connected the two ends of electric capacity (C11) and be connected with emitter with the base stage of the first triode (Q11) respectively; The two ends of the second electric capacity (C12) are connected with the collector and emitter of the first triode (Q11); The collector electrode of the first triode (Q11) is by the second resistance (R12) 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 (R13) 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 controlled IC with described PWM and is connected.
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 controlled IC with described PWM and is connected; The low side of described optical coupler is controlled IC with described PWM and is connected;
Sample the high-end of described optical coupler in described theft-resistant link chain unit; when described optical coupler fault being detected; described PWM is controlled IC fill with electric current SINK CURRENT; make described PWM control IC and 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 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 controlled IC with described PWM and is connected;
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) controls IC with described PWM and is connected, and emitter is connected with the emitter of the 3rd triode (Q21); The anodic bonding of the base stage of the 4th triode (Q22) and the second diode (D21), the collector electrode of negative electrode the 3rd triode (Q21) of the 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 controlled IC with described PWM and is connected; High-end and the described PWM of described optical coupler controls IC and is connected;
Sample at the low side of described optical coupler in described theft-resistant link chain unit; when described optical coupler fault being detected; described PWM is controlled IC draw electric current; make described PWM control IC and 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 of described optical coupler controls IC and is connected; The collector electrode of the 5th triode (Q31) of described theft-resistant link chain unit is connected with dc power supply by the 8th resistance (R32), the grounded emitter of the 5th triode (Q31);
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) controls IC with described PWM and is connected, 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 controlled IC with described PWM and is connected; High-end and the described PWM of described optical coupler controls IC and is connected;
Sample at the low side of described optical coupler in described theft-resistant link chain unit; when described optical coupler fault being detected; described PWM is controlled IC fill with electric current; make described PWM control IC and 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 of described optical coupler controls IC and is connected; The collector electrode of the 7th triode (Q41) of described theft-resistant link chain unit is connected with dc power supply by the 11 resistance (R42), the grounded emitter of the 7th triode (Q41);
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 controlled IC with described PWM and is connected.
14. a LED lamp, is characterized in that, comprises LED driver as described in any one in claim 4 to 13.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102116748A CN101873750B (en) | 2010-06-25 | 2010-06-25 | LED (light emitting diode) lamp fault processing method, LED driver and LED lamp |
| PCT/CN2010/075392 WO2011160319A1 (en) | 2010-06-25 | 2010-07-22 | Led lamp fault processing method, led driver and led lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102116748A CN101873750B (en) | 2010-06-25 | 2010-06-25 | LED (light emitting diode) lamp fault processing method, LED driver and LED lamp |
Publications (2)
| Publication Number | Publication Date |
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| CN101873750A CN101873750A (en) | 2010-10-27 |
| CN101873750B true CN101873750B (en) | 2013-11-13 |
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| CN2010102116748A Active CN101873750B (en) | 2010-06-25 | 2010-06-25 | LED (light emitting diode) lamp fault processing method, LED driver and LED lamp |
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| Country | Link |
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| CN (1) | CN101873750B (en) |
| WO (1) | WO2011160319A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102364858B (en) * | 2011-02-01 | 2012-10-24 | 杭州士兰微电子股份有限公司 | Constant-current switching power supply controller capable of controlling through primary side and method |
| CN102709880B (en) * | 2012-06-07 | 2015-03-11 | 无锡市晶源微电子有限公司 | Module with optocoupler protection function |
| CN104582194B (en) * | 2015-01-20 | 2017-02-01 | 浙江大学 | Single-power-key time delay state control PWM dimming circuit used for LED driver |
| EP3278632A1 (en) * | 2015-03-30 | 2018-02-07 | Philips Lighting Holding B.V. | Isolated driver |
| CN105656463B (en) * | 2016-04-05 | 2023-08-15 | 深圳市莱福德光电有限公司 | Protection circuit for super-junction MOS application |
| CN110277982A (en) * | 2019-07-03 | 2019-09-24 | 江苏宏微科技股份有限公司 | A kind of power switch |
| CN115428321A (en) * | 2020-03-04 | 2022-12-02 | 红色半导体公司 | Controller, power converter and related method |
| 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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Also Published As
| Publication number | Publication date |
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| CN101873750A (en) | 2010-10-27 |
| WO2011160319A1 (en) | 2011-12-29 |
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