CN102143640A - LED (light-emitting diode) drive control circuit - Google Patents

LED (light-emitting diode) drive control circuit Download PDF

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Publication number
CN102143640A
CN102143640A CN2011101026560A CN201110102656A CN102143640A CN 102143640 A CN102143640 A CN 102143640A CN 2011101026560 A CN2011101026560 A CN 2011101026560A CN 201110102656 A CN201110102656 A CN 201110102656A CN 102143640 A CN102143640 A CN 102143640A
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output
open
circuit
port
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CN102143640B (en
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姚丰
王栋
吴建兴
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Hangzhou Silan Microelectronics Co Ltd
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Hangzhou Silan Microelectronics Co Ltd
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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
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Abstract

The invention discloses a LED (light-emitting diode) drive control circuit, which comprises an LED load sampling port, a switch port and a comparison port. An error amplifier module compares the LED load sampling voltage with the reference voltage and amplifies the LED load sampling voltage; a comparison module feeds the voltage of the comparison port and the current sampling signal to a logic processing module after comparing the voltage of the comparison port and the current sampling signal are compared; an open circuit detection protection module detects whether a LED load is open-circuited, detects the duration of the open circuit and outputs the open circuit status signal, an output for a first output end of the open circuit detection protection module and an output of the error amplifier module commonly control the voltage of the comparison port, and a second output end of the open circuit detection protection module outputs the current limiting threshold; a current limiting module feeds the current limiting threshold and the current sampling signal to the logic processing module after the current limiting threshold and the current sampling signal are compared; the logic processing module processes the logic of an input, and the output controls the switch of a power tube through a drive module. The LED drive control circuit prevents the current of an inductor of the LED drive circuit from rapidly rising and avoids the LED load and the power tube being burnt after the LED load is switched on.

Description

The LED Drive and Control Circuit
Technical field
The present invention relates to the LED Drive Control Technique, relate in particular to the LED load open circuit protection technology of the led drive circuit under the fixed switching frequency decompression mode.
Background technology
At present,, can be divided into boost mode and decompression mode, whether change according to switching frequency and can be divided into fixed switching frequency and variable power switch frequency according to the topological difference in periphery at led drive circuit.In the LED Drive and Control Circuit of general employing boost mode, the designer can take load open circuit protection to prevent that output voltage is out of control.But in general decompression mode led drive circuit, particularly extensively adopt the LED Drive and Control Circuit of fixed switching frequency decompression mode in the high-power LED drive circuit, behind load open circuit, chip internal is not taked any detection action, the LED Drive and Control Circuit 11 as shown in Figure 1, comprising:
LED load sample port FB, switch port SW, comparison port COMP;
Error amplification module 12: described error amplification module 12 is by LED load sample port FB input LED load sampled voltage, and the same reference voltage of LED load sampled voltage compares and amplifies;
Current sample module 110, the electric current that flows through power tube in 110 pairs of switch modules 111 of described current sample module is sampled, and the current sampling signal of output offers comparison module 13 and current limliting module 17;
Comparison module 13, the current sampling signal of voltage and current sampling module 110 outputs of 13 pairs of comparisons of described comparison module port COMP compares, and comparative result offers logic processing module 14;
Current limliting module 17, the same dc reference of current sampling signal of 17 pairs of current sample modules of described current limliting module, 110 outputs compares, and comparative result offers logic processing module 14;
Logic processing module 14, described logic processing module 14 is input clock signal, the output signal of current limliting module 17, the output signal of comparison module 13 respectively, and logical process is carried out in above-mentioned input, and the output of logic processing module 14 offers driver module 18;
Driver module 18, the power tube control end of described driver module 18 driving switch modules 111;
Switch module 111, the output of described switch module 111 connects switch port SW.
Compare the external electric capacity of port, the other end ground connection of electric capacity will be compared port voltage by electric capacity and be carried out filtering.
Fig. 2 is the specific embodiment of LED Drive and Control Circuit shown in Figure 1.
Behind the above-mentioned led drive circuit open circuit, when LED load open circuit after a period of time duration, relatively the voltage of port COMP continues to rise, its oscillogram as shown in Figure 3, if connect the LED load, especially when input voltage VIN is higher, external inductors electric current moment is flushed to very high, to stationary value, and the high inductive current of moment might damage LED load and power tube until the led drive circuit loop adjustment.
Summary of the invention
The present invention overcomes the defective that exists in the above-mentioned prior art, has proposed a kind of LED Drive and Control Circuit, and this LED Drive and Control Circuit has realized the load open circuit protection of the led drive circuit under the fixed switching frequency decompression mode.
The LED Drive and Control Circuit comprises:
LED load sample port, switch port, comparison port;
The error amplification module: described error amplification module is by LED load sample port input LED load sampled voltage, and the same reference voltage of LED load sampled voltage compares and amplifies;
The current sample module, described current sample module is sampled to the electric current that flows through power tube in the switch module, and the current sampling signal of output offers comparison module and current limliting module;
Comparison module, described comparison module compares the current sampling signal of the relatively voltage and current sampling module output of port, and comparative result offers logic processing module;
Open circuit detects protection module, whether described open circuit detects the input detection LED load of protection module and opens a way, and the duration of open circuit, the output open circuit status signal, surpass Preset Time when the duration of open circuit, the open-circuit condition signal of the 3rd output output is effective, first output output that open circuit detects protection module with the output acting in conjunction of error amplification module in port relatively, control ratio is than the voltage of port, and second output of open-circuit-protection module is exported a current limit threshold;
Described open circuit detects the protection module first input end and detects the mode whether the LED load open a way and be: the control signal of the power tube of switch module is input to first input end, perhaps directly imports the detection signal at LED load two ends;
The current limliting module, described current limliting module compares the current limit threshold of open circuit protection module output and the current sampling signal of current sample module output, and comparative result offers logic processing module;
Logic processing module, described logic processing module output signal, the open circuit of input clock signal, current limliting module respectively detects the open-circuit condition signal of protection module output, the output signal of comparison module, and above-mentioned input carried out logical process, the output of logic processing module offers driver module;
Driver module, the power tube control end of described driver module driving switch module;
Switch module, the output of described switch module connects switch port.
After led drive circuit powers on, clocking, the first input end of the open circuit detection protection module of LED Drive and Control Circuit detects the control signal of the power tube of switch module, and the current limliting module is output as zero;
When duration of LED load open circuit less than Preset Time, the LED Drive and Control Circuit is charged to electric capacity by comparing port, described electric capacity is connected between comparison port and the ground, relatively port voltage continues to rise, open circuit detects second output of protection module and exports first level, and power tube control end signal is effective, and current sampling signal is zero, open a way and detect the open-circuit condition invalidating signal of protection module output, first output that open circuit detects protection module does not act on comparing port;
Surpass Preset Time when the duration of LED load open circuit, the open-circuit condition signal of open circuit detection protection module output is effective, cause opening a way first output that detects protection module with the output acting in conjunction of error amplification module in port relatively, relatively port voltage is reduced to zero, second output that open circuit detects protection module is reduced to second level from first level, the output signal of comparison module is invalid, only subject clock signal control of logic processing module;
After the LED load is connected; the inductive current of led drive circuit rises; the current sample module detects current sampling signal; described current limliting module compares current limit threshold and the current sampling signal that open circuit detects protection module output; comparative result offers logic processing module; the output signal of logic processing module resets; reset signal is turn-offed by driver module power controlling pipe; open circuit detect protection module detect the power tube control signal invalid after; the open-circuit condition invalidating signal of output; first output that open circuit detects protection module is not acting on the comparison port; open circuit detects second output of protection module and exports first level; relatively port voltage rises gradually from zero; after this by the set of clock signal control logic processing module, the power tube conducting is when the comparison module output signal is effective; the control logic processing module resets, and power tube turn-offs.
Beneficial effect of the present invention is: because the open-circuit-protection module is when the open-circuit condition signal is effective; relatively port voltage is reduced to zero; and current limit threshold is reduced to second level; thereby after preventing that the LED load from connecting; electric current on the led drive circuit inductance raises fast, avoids LED load and power tube to burn out.The present invention simultaneously will compare port voltage by electric capacity and carry out filtering, so the present invention has realized comparing the multiplexing of port.
Description of drawings
Fig. 1 is the part block diagram for traditional fixed frequency switching mode LED Drive and Control Circuit that does not adopt open-circuit-protection.
Fig. 2 is the specific embodiment of Fig. 1.
Fig. 3 is the oscillogram of LED Drive and Control Circuit shown in Figure 1.
Fig. 4 is the part block diagram of the fixed frequency switching mode LED Drive and Control Circuit of the employing open-circuit-protection of the present invention's proposition.
Fig. 5 is a kind of led drive circuit topological structure of the LED Drive and Control Circuit of the present invention's proposition.
Fig. 6 is another led drive circuit topological structure of the LED Drive and Control Circuit of the present invention's proposition.
Fig. 7 is the oscillogram of the LED Drive and Control Circuit of the present invention's proposition.
Embodiment
Be elaborated below in conjunction with block diagram of the present invention and specific embodiment schematic diagram content of the present invention.
As shown in Figure 4, LED Drive and Control Circuit 21 comprises:
LED load sample port FB, switch port SW, comparison port COMP;
Error amplification module 22: described error amplification module 22 is by LED load sample port input LED load sampled voltage, and the same reference voltage of LED load sampled voltage compares and amplifies;
Current sample module 210: 210 of described current sample moulds are sampled to the electric current that flows through power tube in the switch module 211, and the current sampling signal of output offers comparison module 23 and current limliting module 27;
Comparison module 23, the current sampling signal of voltage and current sampling module 210 outputs of 23 pairs of comparisons of described comparison module port COMP compares, and comparative result offers logic processing module 24;
Open circuit detects protection module 25 and comprises open circuit detection module 252 and open-circuit-protection module 251, the first input end input clock signal of described open circuit detection module (252), the control signal of the power tube of the second input input switch module 211, whether detect the LED load opens a way, and the duration of open circuit, the output open circuit status signal surpasses Preset Time when the duration of open circuit, and the open-circuit condition signal of output is effective;
Open-circuit-protection module 251, described open-circuit-protection module receives the open-circuit condition signal, the output of first output of open-circuit-protection module 251 with the output acting in conjunction of error amplification module 22 in port COMP relatively, control ratio is than the voltage of port COMP, and second output of open-circuit-protection module 251 is exported a current limit threshold;
Current limliting module 27, the current limit threshold of 27 pairs of open circuits of described current limliting module protection module, 251 outputs and the current sampling signal of current sample module 210 outputs compare, and comparative result offers logic processing module 24;
Logic processing module 24, described logic processing module 24 output signal, the open circuit detection module of input clock signal, current limliting module 27 is respectively exported 25 open-circuit condition signal, the output signal of comparison module 23, and above-mentioned input carried out logical process, the output of logic processing module 24 offers driver module 28:
Driver module 28, the power tube control end of described driver module 28 driving switch modules;
Switch module 211, the output of described switch module 211 connects switch port SW.
After led drive circuit powers on, clocking, second input of the open circuit detection module 252 of LED Drive and Control Circuit detects the control signal of the power tube of switch module 211, and current limliting module 27 is output as zero;
When duration of LED load open circuit less than Preset Time, the LED Drive and Control Circuit is charged to electric capacity by comparing port COMP, described electric capacity is connected between comparison port and the ground, relatively port voltage continues to rise, second output of open-circuit-protection module 251 is exported first level, and power tube control end signal is effective, and current sampling signal is zero, the open-circuit condition invalidating signal of open circuit detection module 252 outputs, first output of open-circuit-protection module 251 does not act on comparing port COMP;
Surpass Preset Time when the duration of LED load open circuit, the open-circuit condition signal of open circuit detection module 252 outputs is effective, first output that causes open-circuit-protection module 251 with the output acting in conjunction of error amplification module 22 in port COMP relatively, relatively port COMP voltage is reduced to zero, second output of open-circuit-protection module 251 is reduced to second level from first level, the output signal of comparison module 23 is invalid, only subject clock signal control of logic processing module 24;
After the LED load is connected; the inductive current of led drive circuit rises; current sample module 210 detects current sampling signal; the current limit threshold and the current sampling signal of 251 outputs of 27 pairs of open circuits of described current limliting module protection module compare; comparative result offers logic processing module 24; the output signal of logic processing module 24 resets; reset signal is turn-offed by driver module 28 power controlling pipes; the open circuit detection module 252 detect the power tube control signal invalid after; the open-circuit condition invalidating signal of output; first output of open-circuit-protection module 251 is not acting on comparison port COMP; second output of open-circuit-protection module 251 is exported first level; relatively port COMP voltage rises gradually from zero; after this by the set of clock signal control logic processing module, the power tube conducting is when comparison module 23 output signals are effective; control logic processing module 24 resets, and power tube turn-offs.
The topology of the led drive circuit that the LED Drive and Control Circuit is controlled comprises current sampling resistor RSENSE1 as shown in Figure 5, Schottky diode D1, inductance L 1, LED load.Input voltage VIN connects LED load anode through RSENSE1, LED load negative electrode connects inductance L 1 one ends, Schottky diode D1 is connected between the other end of input voltage VIN and inductance L 1, wherein inductance L 1 is connected the SW port of LED Drive and Control Circuit with Schottky diode D1, and LED load anode connects the FB port of LED Drive and Control Circuit.
Further, described error amplification module 22 comprises operational amplifier A 1, the negative input end input internal reference voltage VREF of operational amplifier A 1, the FB port of the positive input termination led drive circuit of operational amplifier A 1, the output of operational amplifier A 1 connects the COMP port.
Further, described comparison module 23 comprises comparator A2 and inverter A10, the positive input terminal input current sampled signal of comparator A2, and the negative input end of comparator A2 connects the COMP port.The input of the output termination inverter A10 of comparator A2, the output of inverter A10 is the output of module 23 as a comparison.
Further, described current limliting module 27 comprises comparator A3, and the negative input end of A3 connects current limit threshold, the positive input terminal input current sampled signal of comparator A3.
Further, described logic processing module 24 comprises rest-set flip-flop A5, two input NOR gate A9, and clock inserts rest-set flip-flop A5 set end, the rest-set flip-flop A5 first termination two input NOR gate A9 output that resets, the reset output of termination current limliting module 27 of rest-set flip-flop A5 second; The output of two input NOR gate A9, one end input termination, 23 comparison modules, other end input pull-down status signal.
Further, described driver module 28 comprises driver A6, the output termination logic processing module output of driver A6, and the output signal of driver A6 directly enters switch module 211 driving N MOS switching tube M1.
Further, described switch module comprises NMOS pipe M1, and the M1 grid connects the output of driver A6, and the source electrode of NMOS pipe M1 is through resistance R 1 ground connection, and the drain electrode of NMOS pipe M1 is the SW port of LED Drive and Control Circuit;
Further, described open circuit detection module 252 comprises timer A7, the clock termination clock OSC of timer A7, the output of the driver connected A6 of input of timer A7.
Further, described open-circuit-protection module 251 comprises switch S 1, resistance R 2, alternative selector A8, switch S 1 one terminating resistor R2, switch S 1 other end one end ground connection, the output of switch S 1 control termination timer A7; The output of resistance R 2 one termination operational amplifier A 1, another termination switch S 1 of resistance R 2, alternative selector A8 input high current limit threshold VCH of termination and low current limliting threshold value VCL, the output of alternative selector control termination timer A7, the negative input end of alternative selector A8 output termination current limliting modules A 3.
Described current sample module 210 comprises current sample amplifier A9, and current sample amplifier A9 input two ends connect source electrode and the ground of NMOS pipe M1 respectively.
Figure 6 shows that the topology of another led drive circuit that the LED Drive and Control Circuit is controlled,
The external LED drive circuit topology 20 of described led drive circuit comprises inductance L 1, Schottky diode D1, current sampling resistor Rsensel and LED load.Power supply VIN is connected to the SW port by the switch module of LED Drive and Control Circuit, the SW port to meet Schottky diode D1.The SW port connects LED load anode, and LED load negative electrode is connected to ground by current sampling resistor RSENSE1.LED load negative electrode is as the FB port of LED Drive and Control Circuit.
Switch module among Fig. 6 (11-2) comprises NMOS pipe M1, and the M1 grid of NMOS pipe connects the output of driver module A6, and the source electrode of NMOS pipe M1 connects the SW port of LED Drive and Control Circuit, and the drain electrode of NMOS pipe M1 meets power supply VIN through resistance R 1.
Fig. 7 is the waveform of the LED Drive and Control Circuit of the present invention's proposition; from shown in waveform can find; connecting moment; owing to adopt the present invention; the open circuit detection module has detected open-circuit condition; the voltage that the open-circuit-protection module will compare port COMP is made as no-voltage, and inductive current slowly rises after connection, up to reaching the setting current value.Then find with comparison of wave shape shown in Fig. 3, the led drive circuit of traditional LED drive control circuit after inductive current after the connection can rise to a very high value, falls back to normal set point again, when input voltage is higher, can cause damage to LED Drive and Control Circuit or external LED load.
The connected mode of power tube and resistance in the switch module that the present invention includes, the type of power tube, specific implementation in the open circuit detection module etc., those skilled in the art can be under the prerequisite of its spirit, numerous embodiments can be arranged, or, form different specific embodiments by various compound mode.
No matter above how detailed explanation is, can have many modes to implement the present invention in addition, and described in the specification is specific embodiment of the present invention.All equivalent transformations that spirit is done according to the present invention or modification all should be encompassed within protection scope of the present invention.
The above-mentioned detailed description of the embodiment of the invention be not exhaustive or be used to limit the present invention to above-mentioned clear and definite in form.Above-mentioned with schematic purpose specific embodiment of the present invention and example are described in, those skilled in the art will recognize that and can carry out various equivalent modifications within the scope of the invention.
At above-mentioned declarative description specific embodiment of the present invention and having described in the anticipated optimal set pattern, no matter how detailed explanation appearred hereinbefore, also can be implemented in numerous ways the present invention.The details of foregoing circuit structure and control mode thereof is carried out in the details at it can carry out considerable variation, yet it still is included among the present invention disclosed herein.

Claims (3)

1.LED drive controlling is characterized in that comprising:
LED load sample port, switch port (SW), comparison port (COMP);
Amplification module: described error amplification module is by LED load sample port input LED load sampled voltage, and the same reference voltage of LED load sampled voltage compares and amplifies;
The current sample module, described current sample module is sampled to the electric current that flows through power tube in the switch module, and the current sampling signal of output offers comparison module and current limliting module;
Comparison module, described comparison module compares the current sampling signal of the relatively voltage and current sampling module output of port, and comparative result offers logic processing module;
Open circuit detects protection module, whether described open circuit detects the input detection LED load of protection module and opens a way, and the duration of open circuit, the output open circuit status signal, surpass Preset Time when the duration of open circuit, the open-circuit condition signal of the 3rd output output is effective, first output output that open circuit detects protection module with the output acting in conjunction of error amplification module in port relatively, control ratio is than the voltage of port, and second output of open-circuit-protection module is exported a current limit threshold;
The current limliting module, described current limliting module compares the current limit threshold of open circuit protection module output and the current sampling signal of current sample module output, and comparative result offers logic processing module;
Logic processing module, described logic processing module is output signal, open a way the open-circuit condition signal of detection module output, the output signal of comparison module of input clock signal, current limliting module respectively, and above-mentioned input carried out logical process, the output of logic processing module offers driver module;
Driver module, the power tube control end of described driver module driving switch module;
Switch module, the output of described switch module connects switch port.
2. LED drive controlling according to claim 1; it is characterized in that described open circuit detects protection module second input and detects the mode whether the LED load open a way and be: the control signal of the power tube of switch module is input to second input, perhaps directly imports the detection signal at LED load two ends.
3. LED drive controlling according to claim 1 is characterized in that:
After led drive circuit powers on, clocking, second input of the open circuit detection module of LED Drive and Control Circuit detects the control signal of the power tube of switch module, and the current limliting module is output as zero;
When duration of LED load open circuit less than Preset Time, the LED Drive and Control Circuit is charged to electric capacity by comparing port, described electric capacity is connected between comparison port and the ground, relatively port voltage continues to rise, second output of open-circuit-protection module is exported first level, and power tube control end signal is effective, and current sampling signal is zero, the open-circuit condition invalidating signal of open circuit detection module output, first output of open-circuit-protection module does not act on comparing port;
Surpass Preset Time when the duration of LED load open circuit, the open-circuit condition signal of open circuit detection module output is effective, first output that causes the open-circuit-protection module with the output acting in conjunction of error amplification module in port relatively, relatively port voltage is reduced to zero, second output of open-circuit-protection module is reduced to second level from first level, the output signal of comparison module is invalid, only subject clock signal control of logic processing module;
After the LED load is connected; the inductive current of led drive circuit rises; the current sample module detects current sampling signal; described current limliting module compares the current limit threshold and the current sampling signal of the output of open circuit protection module; comparative result offers logic processing module; the output signal of logic processing module resets; reset signal is turn-offed by driver module power controlling pipe; the open circuit detection module detect the power tube control signal invalid after; the open-circuit condition invalidating signal of output, first output of open-circuit-protection module is not acting on the comparison port, and second output of open-circuit-protection module is exported first level; relatively port voltage rises gradually from zero; after this by the set of clock signal control logic processing module, the power tube conducting is when the comparison module output signal is effective; the control logic processing module resets, and power tube turn-offs.
CN2011101026560A 2011-04-20 2011-04-20 LED (light-emitting diode) drive control circuit Active CN102143640B (en)

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Publication number Priority date Publication date Assignee Title
CN102821520A (en) * 2012-08-07 2012-12-12 广州晶锐信息技术有限公司 LED (light-emitting diode) driving circuit and control method thereof
CN103491666A (en) * 2012-12-19 2014-01-01 深圳市安派电子有限公司 Flasher of power tube protection circuit
CN103491666B (en) * 2012-12-19 2015-07-29 深圳市安派电子有限公司 A kind of flasher of power valve protective circuit
CN103731954A (en) * 2013-11-28 2014-04-16 成都岷创科技有限公司 Time multiplying signal generating circuit
CN103747558A (en) * 2013-11-28 2014-04-23 成都岷创科技有限公司 LED driving circuit based on time multiplier compensation technology
CN103731954B (en) * 2013-11-28 2015-07-15 成都岷创科技有限公司 Time multiplying signal generating circuit
GB2535102A (en) * 2013-12-25 2016-08-10 Shenzhen China Star Optoelect Single-string overpower protection device and light source driving circuit in display
WO2015096233A1 (en) * 2013-12-25 2015-07-02 深圳市华星光电技术有限公司 Single-string overpower protection device and light source driving circuit in display
GB2535102B (en) * 2013-12-25 2020-11-04 Shenzhen China Star Optoelect Single string over power protection and light source driver circuit used in display device
US9480124B2 (en) 2013-12-25 2016-10-25 Shenzhen China Star Optoelectronics Technology Co., Ltd. Single string over power protection and light source driver circuit used in display device
CN103826363A (en) * 2014-01-28 2014-05-28 杰华特微电子（杭州）有限公司 Hot-plugging protection circuit for LED illuminating apparatus
CN105960055A (en) * 2014-01-28 2016-09-21 杰华特微电子（杭州）有限公司 Hot plug protection circuit for LED illuminator
CN103826363B (en) * 2014-01-28 2016-05-25 杰华特微电子（杭州）有限公司 For the hot plug holding circuit of LED luminaire
CN105960055B (en) * 2014-01-28 2017-08-08 杰华特微电子（杭州）有限公司 A kind of hot plug protection circuit for LED illuminator
CN105573948B (en) * 2014-11-05 2018-11-09 意法半导体亚太私人有限公司 The chip synchronization carried out by master-slave circuit
CN105573948A (en) * 2014-11-05 2016-05-11 意法半导体亚太私人有限公司 Chip synchronization by a master-slave circuit
CN110335580A (en) * 2019-08-19 2019-10-15 深圳南云微电子有限公司 A kind of average current type current buzzer drive circuit

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