CN103152951B - LED (light emitting diode) driving control circuit and driving circuit structure of LED driving control circuit - Google Patents
LED (light emitting diode) driving control circuit and driving circuit structure of LED driving control circuit Download PDFInfo
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- CN103152951B CN103152951B CN201310080178.7A CN201310080178A CN103152951B CN 103152951 B CN103152951 B CN 103152951B CN 201310080178 A CN201310080178 A CN 201310080178A CN 103152951 B CN103152951 B CN 103152951B
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention relates to an LED (light emitting diode) driving control circuit, wherein a peak current detecting circuit detects the source electrode voltage of a built-in power tube, when the source electrode voltage reaches fixed threshold voltage, signals are output to a logic control circuit, a secondary side conduction time detecting circuit detects a voltage inflection point between a second resistor and a third resistor, in addition, signals are output to a logic control circuit, the logic control circuit receives the output signals of the secondary side conduction time detecting circuit and the peak current detecting circuit, the calculation is carried out, in addition, the output signals are transmitted to a driving circuit, the on-off state of the built-in power tube is controlled, and the constant current output is ensured. The invention also relates to an LED driving circuit structure with the control circuit. The LED driving control circuit adopting the structure and the driving circuit structure have the advantages that the voltage change signals of a transformer primary side winding are directly sampled through a voltage dividing circuit under the condition without the auxiliary winding, the circuit structure of an LED driving power supply is simplified, the cost of the driving power supply is reduced, the work performance is stable and reliable, and the application range is wider.
Description
Technical field
The present invention relates to field of switch power, particularly LED driving power technical field, specifically refer to a kind of LED Drive and Control Circuit and driving circuit structure thereof.
Background technology
The switch power controller that more traditional secondary controls, it is little that the switch power controller that former limit controls has volume, simple circuit, good stability and the low feature of cost.Therefore the switch power controller that former limit controls gets more and more in LED drive power, and charger for mobile phone, power supply adaptor obtains a wide range of applications.
Fig. 1 is low-power LED driving power source system schematic diagram of the prior art.This Switching Power Supply is by bridge rectifier 100, and high-voltage filtering capacitor 101, the transformer XFMR that transformer primary side winding 104, transformer assist winding 105 and transformer secondary winding 106 to form, is mainly used in electrical isolation and the Energy Transfer of input and output.The grid of power switch pipe 112 connects former limit control circuit 121, the Same Name of Ends of drain electrode connection transformer former limit winding 104, source series resistance 115 ground connection.Transformer assists winding 105 Same Name of Ends to connect two resistance 113 and resistance 114 ground connection of series connection, and transformer assists the Same Name of Ends of winding 105 to connect diode 110 anode, the common port of diode cathode contact resistance 102 and electric capacity 111, different name end ground connection.The Same Name of Ends of transformer secondary winding 106 connects the anode of diode 107, shunt capacitance 108 and LED load 109 between diode 107 negative electrode and ground, the different name end ground connection of transformer secondary winding 106.
This Switching Power Supply controls the turn-on and turn-off of power switch pipe 112 by the drive circuit 116 of former limit control circuit 121, thus realizes energy is sent to the output of transformer secondary winding 106 process by transformer primary side winding 104.The FB pin of former limit control circuit 121 is assisted winding 105 to be connected in series to the common port voltage high level time on the resistance 113 on ground and resistance 114 by sampling transformer and is controlled the turn-on and turn-off of power switch pipe 112, thus realizes the constant current output of LED drive power.
Although the Switching Power Supply that above-mentioned LED drive power has controlled compared with secondary reduces to some extent at cost and volume, still need auxiliary winding to sample, make program volume still comparatively large, cost is slightly high, brings certain obstacle to applying of LED.
Summary of the invention
The constant current output the object of the invention is to overcome above-mentioned shortcoming of the prior art, provide a kind of and can significantly optimize power-supply system, guaranteed to realize LED drive power, reduce cost, small volume, simple and practical, stable and reliable working performance, scope of application LED Drive and Control Circuit and the driving circuit structure thereof comparatively widely of overall plan.
In order to realize above-mentioned object, LED Drive and Control Circuit of the present invention and driving circuit structure thereof have following formation:
This LED Drive and Control Circuit, its main feature is, described control circuit comprises built-in power pipe, the drain electrode of this built-in power pipe is coupled with externally fed load circuit and is connected, the drain electrode of this built-in power pipe is successively by the second resistance and the 3rd grounding through resistance of series connection mutually, and the drain electrode of this built-in power pipe is also successively by high-voltage current source and the second capacity earth, the source electrode of this built-in power pipe is by the first grounding through resistance, and the source electrode of this built-in power pipe passes through peak current detection circuit successively, logic control circuit, drive circuit is connected with the grid of this built-in power pipe, the input of described logic control circuit is connected between the second described resistance and the 3rd resistance by secondary ON time testing circuit, described peak current detection circuit detects the voltage of the source electrode of this built-in power pipe, described logic control circuit is outputed signal to when reaching the fixed threshold voltage that this control circuit is preset, the second resistance described in described secondary ON time testing circuit detects and the voltage knee between the 3rd resistance, and output signal to described logic control circuit, secondary ON time testing circuit described in described logic control circuit receives and the output signal of peak current detection circuit, carry out computing and output signal is delivered to described drive circuit, the turn-on and turn-off of the built-in power pipe described in control, ensure constant output current.
Peak current detection circuit in this LED Drive and Control Circuit is the first comparator, the anode of the first described comparator is connected with the source electrode of described built-in power pipe, the fixed threshold voltage end Vlimit that negative terminal and this control circuit of this first comparator are preset is connected, and the output of this first comparator is connected with the input of described logic control circuit.
Secondary ON time testing circuit in this LED Drive and Control Circuit comprises rest-set flip-flop, the S input of described rest-set flip-flop is connected with the output of the first described comparator, the Q output of this rest-set flip-flop is connected between the second described resistance and the 3rd resistance by internal switch, and the Q output of this rest-set flip-flop is connected with the negative terminal of bleeder circuit with the second comparator by the first delay circuit successively, the first described delay circuit is connected by the anode of the second delay circuit with the second described comparator, and the output of this second comparator is connected with the input of described logic control circuit, the output of this second comparator is also connected with the R input of described rest-set flip-flop by inverter.
Built-in power pipe in this LED Drive and Control Circuit is field effect transistor.
This has the LED drive circuit structure of above-mentioned control circuit, its main feature is, also bridge rectifier can be comprised in described circuit structure, first high-voltage filtering capacitor, transformer primary side winding and transformer secondary winding, described transformer primary side winding and transformer secondary winding are coupled, described bridge rectifier is by this first high-voltage filtering capacitor ground connection, and this bridge rectifier is connected with the different name end of described transformer primary side winding, the drain electrode of described built-in power pipe is connected with the Same Name of Ends of described transformer primary side winding, described transformer secondary winding is connected with LED load circuit.
LED load circuit in this LED drive circuit structure comprises diode, described transformer secondary Motor Winding Same Name of Ends is connected with the positive pole of this diode, and the negative pole of this diode is by the 3rd electric capacity parallel with one another and LED load ground connection, the different name end ground connection of this transformer secondary winding.
This has the LED drive circuit structure of above-mentioned control circuit, its main feature is, also bridge rectifier, the first high-voltage filtering capacitor and transformer coil also can be comprised in described circuit structure, described bridge rectifier is by this first high-voltage filtering capacitor ground connection, and this bridge rectifier is connected by the drain electrode of described transformer coil with described built-in power pipe, and described transformer coil is connected with LED load circuit.
LED load circuit in this LED drive circuit structure comprises diode, and described diode and the 3rd electric capacity parallel with one another and LED load are in series, and are connected across described transformer coil two ends.
This has the LED drive circuit structure of above-mentioned control circuit, its main feature is, bridge rectifier, the first high-voltage filtering capacitor, LED load circuit and transformer coil also can also be comprised in described circuit structure, described bridge rectifier is by this first high-voltage filtering capacitor ground connection, and this bridge rectifier is connected with the drain electrode of described built-in power pipe by described LED load circuit, transformer coil successively.
LED load circuit in this LED drive circuit structure comprises diode and the 3rd electric capacity and LED load parallel with one another, described the 3rd electric capacity parallel with one another and LED load are connected between described bridge rectifier and transformer coil, and the anode of described diode is connected to the drain electrode of described built-in power pipe, the negative terminal of this diode is connected to described bridge rectifier.
Have employed LED Drive and Control Circuit and the driving circuit structure thereof of this invention, owing to wherein eliminating auxiliary winding and sample circuit thereof, mainly through the voltage knee signal of bleeder circuit sample detecting former limit winding, obtain the current over-zero moment of fly-wheel diode, thus determine the time of afterflow of fly-wheel diode, calculate the average current of LED load, realize LED constant current to drive, thus at the signal without the need to the change in voltage by bleeder circuit sampling transformer primary side winding direct when auxiliary winding, realize the control to output current, thus simplify the circuit structure of LED drive power, reduce LED drive power volume, reduce LED drive power cost, stable and reliable working performance, the scope of application is comparatively extensive, not only may be used for isolated supplies converter, non-isolation type supply convertor or other type of converter can also be applied to.
Accompanying drawing explanation
Fig. 1 is inverse-excitation type constant current driver circuit for LED schematic diagram of the prior art.
Fig. 2 is the schematic block circuit diagram of inverse-excitation type LED drive circuit of the present invention.
Fig. 3 is the electrical block diagram of inverse-excitation type LED drive circuit of the present invention.
Fig. 4 is the logical signal figure of each point in LED Drive and Control Circuit of the present invention and driving circuit structure practical work process thereof.
Fig. 5 is that the non-isolation type of LED drive circuit of the present invention and LED load is connected in parallel schematic diagram.
Fig. 6 is that the non-isolation type of LED drive circuit of the present invention and LED load is connected in series schematic diagram.
Embodiment
In order to more clearly understand technology contents of the present invention, describe in detail especially exemplified by following examples.
Refer to shown in Fig. 2 to Fig. 4, this LED Drive and Control Circuit, wherein, described control circuit comprises built-in power pipe 213, the drain electrode of this built-in power pipe 213 is coupled with externally fed load circuit and is connected, the drain electrode of this built-in power pipe 213 is successively by the second resistance 216 and the 3rd resistance 217 ground connection of series connection mutually, and the drain electrode of this built-in power pipe 213 is also successively by high-voltage current source 208 and the second electric capacity 214 ground connection, the source electrode of this built-in power pipe 213 is by the first resistance 207 ground connection, and the source electrode of this built-in power pipe 213 is successively by peak current detection circuit 210, logic control circuit 211, drive circuit 209 is connected with the grid of this built-in power pipe 213, the input of described logic control circuit 211 is connected between the second described resistance 216 and the 3rd resistance 217 by secondary ON time testing circuit 212, described peak current detection circuit 210 is responsible for the voltage of the source electrode detecting this built-in power pipe 213, described logic control circuit 211 is outputed signal to when reaching the fixed threshold voltage that this control circuit is preset, described secondary ON time testing circuit 212 detects the voltage knee between the second described resistance 216 and the 3rd resistance 217, and output signal to described logic control circuit 211, described logic control circuit 211 receives described secondary ON time testing circuit 212 and the output signal of peak current detection circuit 210, carry out computing and output signal is delivered to described drive circuit 209, the turn-on and turn-off of the built-in power pipe 213 described in control, ensure constant output current.
Wherein, described peak current detection circuit 210 is the first comparator 315, the anode of the first described comparator 315 is connected with the source electrode of described built-in power pipe 213, the fixed threshold voltage end Vlimit that negative terminal and this control circuit of this first comparator 315 are preset is connected, and the output of this first comparator 315 is connected with the input of described logic control circuit 211, described secondary ON time testing circuit 212 comprises rest-set flip-flop 316, the S input of described rest-set flip-flop 316 is connected with the output of the first described comparator 315, the Q output of this rest-set flip-flop 316 is connected between the second described resistance 216 and the 3rd resistance 217 by internal switch 312, and the Q output of this rest-set flip-flop 316 is connected with the negative terminal of bleeder circuit 319 with the second comparator 318 by the first delay circuit 320 successively, the first described delay circuit 320 is connected by the anode of the second delay circuit 321 with the second described comparator 318, and the output of this second comparator 318 is connected with the input of described logic control circuit 211, the output of this second comparator 318 is also connected by the R input of inverter 317 with described rest-set flip-flop 316.
Meanwhile, the built-in power pipe 213 in this LED Drive and Control Circuit is field effect transistor.
Refer to again shown in Fig. 3, this has the LED drive circuit structure of above-mentioned control circuit, wherein can also comprise bridge rectifier 200, first high-voltage filtering capacitor 201, transformer primary side winding 202 and transformer secondary winding 203, described transformer primary side winding 202 and transformer secondary winding 203 are coupled, described bridge rectifier 200 is by this first high-voltage filtering capacitor 201 ground connection, and this bridge rectifier 200 is connected with the different name end of described transformer primary side winding 202, the drain electrode of described built-in power pipe 213 is connected with the Same Name of Ends of described transformer primary side winding 202, described transformer secondary winding 203 is connected with LED load circuit.
Wherein, described LED load circuit comprises diode 205, described transformer secondary winding 203 Same Name of Ends is connected with the positive pole of this diode 205, and the negative pole of this diode 205 is by the 3rd electric capacity 206 parallel with one another and LED load 204 ground connection, the different name end ground connection of this transformer secondary winding 203.
Refer to again shown in Fig. 5, it is the non-isolation type parallel of LED drive circuit of the present invention and LED load, comprising bridge rectifier 200, first high-voltage filtering capacitor 201 and transformer coil, described bridge rectifier 200 is by this first high-voltage filtering capacitor 201 ground connection, and this bridge rectifier 200 is connected by the drain electrode of described transformer coil with described built-in power pipe 213, and described transformer coil is connected with LED load circuit.
Wherein, described LED load circuit comprises diode 205, and described diode 205 is in series with the 3rd electric capacity 206 parallel with one another and LED load 204, and is connected across described transformer coil two ends.
Refer to again shown in Fig. 6, its non-isolation type for LED drive circuit of the present invention and LED load is connected in series mode, comprising bridge rectifier 200, first high-voltage filtering capacitor 201, LED load circuit and transformer coil, described bridge rectifier 200 is by this first high-voltage filtering capacitor 201 ground connection, and this bridge rectifier 200 is connected with the drain electrode of described built-in power pipe 213 by described LED load circuit, transformer coil successively.
Wherein, described LED load circuit comprises diode 205 and the 3rd electric capacity 206 parallel with one another and LED load 204, described the 3rd electric capacity 206 parallel with one another and LED load 204 are connected between described bridge rectifier 200 and transformer coil, and the anode of described diode 205 is connected to the drain electrode of described built-in power pipe 213, the negative terminal of this diode 205 is connected to described bridge rectifier 200.
In the middle of reality uses, refer to shown in Fig. 2, this LED drive circuit structure comprises bridge rectifier 200, first high-voltage filtering capacitor 201, transformer primary side winding 202, transformer secondary winding 203, is coupled to the LED drive circuit 215 of described transformer primary side winding 202.The Same Name of Ends of the transformer primary side winding 202 described in drain electrode connection of the built-in power pipe 213 of described LED drive circuit 215, the source electrode of this built-in power pipe 213 is by the first resistance 207 ground connection, and the source electrode of built-in power pipe 213 and the LED drive circuit 215 pin CS that samples links together.The Same Name of Ends of this transformer primary side winding 202 is also connected to ground by the second resistance 216 of series connection mutually and the 3rd resistance 217, and the second resistance 216 is connected the FB pin of LED drive circuit 215 with the common port of the 3rd resistance 217.Second electric capacity 214 is connected to VCC pin and the GND pin of LED drive circuit 215 respectively; Transformer secondary winding 203 Same Name of Ends is connected to diode 205 anode, and the 3rd electric capacity 206 in parallel and LED load 204 between diode 205 negative electrode and ground, winding 203 different name end ground connection assisted by transformer.
Described LED drive circuit 215 also comprises high-voltage current source 208, drive circuit 209, peak current detection circuit 210, logic control circuit 211, secondary ON time testing circuit 212, built-in power pipe 213; High-voltage current source 208 one end of described LED drive circuit 215 connects the drain electrode of built-in power pipe 213, and the other end connects the VCC pin of LED drive power 215 and passes through the second electric capacity 214 ground connection.High-voltage current source 208 is responsible for charging to electric capacity 214, to ensure the normal work of chip.
Drive circuit 209 output of described LED drive circuit 215 is connected to the grid of internal power pipe 213, input connects logic control circuit 211, drive circuit 209, after the signal accepting logic control circuit 211, is responsible for the turn-on and turn-off controlling internal power pipe 213; Described peak current detection circuit 210 is responsible for the voltage detected on the sampling pin CS of LED drive circuit 215, outputs signal to logic control circuit 211 when reaching fixed threshold.
Described secondary ON time testing circuit 212 is responsible for the voltage knee of detection second resistance 216 and the 3rd resistance 217 common port, obtain the current over-zero moment of fly-wheel diode 205, and output signal to logic control circuit 211, with the ON time facilitating logic control circuit to calculate fly-wheel diode 205, and export corresponding control signal to built-in power pipe 213.
Described logic control circuit 211 is responsible for the output signal accepting secondary ON time testing circuit 212 and peak current detection circuit 210, drive circuit 209 is outputed signal to after calculating, reach the turn-on and turn-off controlling internal power pipe 213, ensure that constant output current is in set value.
Refer to again shown in Fig. 3, wherein for isolated form LED drive power comprises bridge rectifier 300, the high-voltage filtering capacitor 301 in parallel with bridge-type finishing circuit, transformer primary side winding 302, transformer secondary winding 303, is coupled to the LED drive circuit 323 of described transformer primary side winding 302.The sampling pin CS of LED drive circuit 323 arrives ground by the first resistance 307 of series connection.The sampling pin FB of LED drive circuit 323 connects the common port of the second resistance and the 3rd resistance, and the pin VCC of LED drive circuit 323 connects one end of the second electric capacity 310, and the other end is connected to GND.The Same Name of Ends of described transformer primary side winding 302 by the second resistance 308 of series connection and the 3rd resistance 309 to ground.The Same Name of Ends of transformer secondary winding 303 is connected to the anode of diode 305, and the 3rd electric capacity 306 in parallel and LED load 304 between diode 305 negative electrode and ground, winding 303 different name end ground connection assisted by transformer.Above-mentioned LED drive circuit comprises high-voltage current source HV Current Source311, internal switch 312, internal drive circuits Driver313, built-in power pipe 314, inner first comparator 315, inner rest-set flip-flop 316, internal inverters 317, inner second comparator 318, inner bleeder circuit 319, inner first delay circuit 320, inner second delay circuit 321, logic control circuit 322.
Lower mask body introduces working method and the principle of the LED drive power be made up of LED drive circuit 323 of the present invention.
High-voltage current source HV Current Source311 one end of described LED drive circuit 323 connects the drain electrode of built-in power pipe 314, when LED drive power normally exports, when built-in power pipe 314 turns off, high-voltage current source (HV Current Source) 311 is charged to the second electric capacity 310 be connected in parallel between VCC and GND.To ensure that VCC is within normal operating voltage range, makes chip normally work.
The internal drive circuits Driver313 of LED drive circuit 323 by control open built-in power pipe 314 open time, by the stored energy of AC on transformer primary side winding 302.Internal drive circuits Driver313 control built-in power pipe 314 turn off time, the transformer secondary winding 303 be coupled with transformer primary side winding 302 by energy transferring to LED load 304.
Internal comparator 315 one end connects the first resistance 307, the other end is connected and fixed threshold value Vlimit, when the first ohmically voltage is higher than fixed threshold Vlimit, output signal to logic control circuit Logic322, built-in power pipe 314 is turned off, to reach the object of transformer primary side winding 302 stored energy, ensure that each cycle can normally work.When the first ohmically voltage is higher than fixed threshold Vlimit, inner first comparator 315 output signal can make the output of inner rest-set flip-flop 316 set high, make internal switch 312 conducting, sampled signal on FB arrives the first delay circuit 320, and latches through bleeder circuit 319 negative terminal exporting to inner second comparator 318 after maintenance.The signal that now the first delay circuit 320 passes through exports to the anode of inner second comparator 318 simultaneously through the second delay circuit 321.After FB sampled signal is lower than previous latch inhibit signal, output low level is to inverter 317 and logical circuit Logic322, and inverter 317 makes the output of inner rest-set flip-flop set low, and internal switch 312 is turned off, no longer sampled signal.
Internal logic circuit Logic322 passes through the output signal of acceptance first comparator 315 and the second comparator 318; calculate the ON time of secondary fly-wheel diode 305; and control the conducting of built-in power pipe 314 precise time; to reach the value of constant output current in setting; if the ON time obtained is less than default minimum time of afterflow, then can carry out overvoltage protection to LED drive circuit.To ensure that LED drive power is stablized, the work of safety.
As Figure 4 shows be work wave of the present invention, be specially the logical signal figure of each point in LED Drive and Control Circuit and driving circuit structure practical work process thereof.Logic signal is the output signal of logic control circuit, is realized the switch of power tube 314 by drive circuit 313, and the waveform of Vds is former limit winding 302 Same Name of Ends waveform over the ground, and Ipk is former limit peak current waveform.The waveform of VFB is the waveform of the bulletin end of the second resistance 308 and the 3rd resistance 309, the VFB of LED Drive and Control Circuit of the present invention by this waveform of sampling, realize the detection to secondary fly-wheel diode ON time, the waveform of Detector is the output waveform of interior detectors, the waveform of what Ispk showed is secondary peak current.
The basic thought of LED drive circuit of the present invention is, eliminate auxiliary winding and sample circuit thereof, and achieve the constant current output of LED drive power, reduce power volume, reduce the cost of overall plan, this its distinguishing feature is in the Same Name of Ends of former limit winding, the drain electrode of power tube or series resistance between corresponding equivalent potential and ground, LED drive circuit by detecting the change of the Same Name of Ends of former limit winding, the drain electrode of power tube or the voltage of corresponding equivalent potential, thus realizes the detection of secondary fly-wheel diode ON time.Can see that power tube can be power MOS pipe simultaneously, pliotron or other power switchs, power tube can be built-in or external, and the divider resistance of detection can be built-in or external, can be connected on the corresponding equivalent potential such as one end of transformer primary side winding or the drain electrode of power tube.The translation circuit of isolation varying circuit or non-isolated can be comprised for application LED power of the present invention, wherein buffer circuit can be AC-DC Flyback converter, DC-DC Flyback converter or other types converter, but non-isolated translation circuit Buck converter or One Buck-Boost converter body or other types converter.It should be noted that, above-mentioned term, only as denotion one of its title meant, therefore allly means the title identical or approximate with it and all should be considered as its equivalent.
Have employed above-mentioned LED Drive and Control Circuit and driving circuit structure thereof, owing to wherein eliminating auxiliary winding and sample circuit thereof, mainly through the voltage knee signal of bleeder circuit sample detecting former limit winding 202, obtain the current over-zero moment of fly-wheel diode 205, thus determine the time of afterflow of fly-wheel diode 205, calculate the average current of LED load, realize LED constant current to drive, thus at the signal without the need to the change in voltage by bleeder circuit sampling transformer primary side winding direct when auxiliary winding, realize the control to output current, thus simplify the circuit structure of LED drive power, reduce LED drive power volume, reduce LED drive power cost, stable and reliable working performance, the scope of application is comparatively extensive, not only may be used for isolated supplies converter, non-isolation type supply convertor or other type of converter can also be applied to.
In this description, the present invention is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (9)
1. a LED Drive and Control Circuit, it is characterized in that, described control circuit comprises built-in power pipe (213), the drain electrode of this built-in power pipe (213) is coupled with externally fed load circuit and is connected, the drain electrode of this built-in power pipe (213) is successively by the second resistance (216) and the 3rd resistance (217) ground connection of series connection mutually, and the drain electrode of this built-in power pipe (213) is also successively by high-voltage current source (208) and the second electric capacity (214) ground connection; the source electrode of this built-in power pipe (213) is by the first resistance (207) ground connection, and the source electrode of this built-in power pipe (213) is successively by peak current detection circuit (210), logic control circuit (211), drive circuit (209) is connected with the grid of this built-in power pipe (213), the input of described logic control circuit (211) is connected between described the second resistance (216) and the 3rd resistance (217) by secondary ON time testing circuit (212), described peak current detection circuit (210) detects the voltage of the source electrode of this built-in power pipe (213), described logic control circuit (211) is outputed signal to when reaching the fixed threshold voltage that this control circuit is preset, the second resistance (216) described in described secondary ON time testing circuit (212) detects and the voltage knee between the 3rd resistance (217), and output signal to described logic control circuit (211), secondary ON time testing circuit (212) described in described logic control circuit (211) receives and the output signal of peak current detection circuit (210), carry out computing and output signal is delivered to described drive circuit (209), the turn-on and turn-off of the built-in power pipe (213) described in control, ensure constant output current, described secondary ON time testing circuit (212) comprises rest-set flip-flop (316), the S input of described rest-set flip-flop (316) is connected with the output of described peak current detection circuit (210), the Q output of this rest-set flip-flop (316) is connected between described the second resistance (216) and the 3rd resistance (217) by internal switch (312), and the Q output of this rest-set flip-flop (316) is connected with the negative terminal of bleeder circuit (319) with the second comparator (318) by the first delay circuit (320) successively, described the first delay circuit (320) is connected by the anode of the second delay circuit (321) with described the second comparator (318), and the output of this second comparator (318) is connected with the input of described logic control circuit (211), the output of this second comparator (318) is also connected by the R input of inverter (317) with described rest-set flip-flop (316).
2. LED Drive and Control Circuit according to claim 1, it is characterized in that, described peak current detection circuit (210) is the first comparator (315), the anode of described the first comparator (315) is connected with the source electrode of described built-in power pipe (213), the fixed threshold voltage end (Vlimit) that negative terminal and this control circuit of this first comparator (315) are preset is connected, and the output of this first comparator (315) is connected with the input of described logic control circuit (211).
3. LED Drive and Control Circuit according to any one of claim 1 to 2, is characterized in that, described built-in power pipe (213) is field effect transistor.
4. one kind has the LED drive circuit structure of control circuit according to claim 1, it is characterized in that, bridge rectifier (200) is also comprised in described circuit structure, first high-voltage filtering capacitor (201), transformer primary side winding (202) and transformer secondary winding (203), described transformer primary side winding (202) and transformer secondary winding (203) are coupled, described bridge rectifier (200) is by this first high-voltage filtering capacitor (201) ground connection, and this bridge rectifier (200) is connected with the different name end of described transformer primary side winding (202), the drain electrode of described built-in power pipe (213) is connected with the Same Name of Ends of described transformer primary side winding (202), described transformer secondary winding (203) is connected with LED load circuit.
5. LED drive circuit structure according to claim 4, it is characterized in that, described LED load circuit comprises diode (205), described transformer secondary winding (203) Same Name of Ends is connected with the positive pole of this diode (205), and the negative pole of this diode (205) is by the 3rd electric capacity (206) parallel with one another and LED load (204) ground connection, the different name end ground connection of this transformer secondary winding (203).
6. one kind has the LED drive circuit structure of control circuit according to claim 1, it is characterized in that, bridge rectifier (200), the first high-voltage filtering capacitor (201) and transformer coil is also comprised in described circuit structure, described bridge rectifier (200) is by this first high-voltage filtering capacitor (201) ground connection, and this bridge rectifier (200) is connected by the drain electrode of described transformer coil with described built-in power pipe (213), and described transformer coil is connected with LED load circuit.
7. LED drive circuit structure according to claim 6, it is characterized in that, described LED load circuit comprises diode (205), described diode (205) is in series with the 3rd electric capacity (206) parallel with one another and LED load (204), and is connected across described transformer coil two ends.
8. one kind has the LED drive circuit structure of control circuit according to claim 1, it is characterized in that, bridge rectifier (200), the first high-voltage filtering capacitor (201), LED load circuit and transformer coil is also comprised in described circuit structure, described bridge rectifier (200) is by this first high-voltage filtering capacitor (201) ground connection, and this bridge rectifier (200) is connected with the drain electrode of described built-in power pipe (213) by described LED load circuit, transformer coil successively.
9. LED drive circuit structure according to claim 8, it is characterized in that, described LED load circuit comprises diode (205) and the 3rd electric capacity (206) parallel with one another and LED load (204), described the 3rd electric capacity (206) parallel with one another and LED load (204) are connected between described bridge rectifier (200) and transformer coil, and the anode of described diode (205) is connected to the drain electrode of described built-in power pipe (213), the negative terminal of this diode (205) is connected to described bridge rectifier (200).
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| CN201310080178.7A CN103152951B (en) | 2013-03-13 | 2013-03-13 | LED (light emitting diode) driving control circuit and driving circuit structure of LED driving control circuit |
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| CN201310080178.7A CN103152951B (en) | 2013-03-13 | 2013-03-13 | LED (light emitting diode) driving control circuit and driving circuit structure of LED driving control circuit |
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| CN103152951B true CN103152951B (en) | 2015-07-08 |
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