CN103533707A - Voltage-stabilization dimmable LED (light emitting diode) driving power supply circuit - Google Patents
Voltage-stabilization dimmable LED (light emitting diode) driving power supply circuit Download PDFInfo
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Abstract
A voltage-stabilization dimmable LED (light emitting diode) driving power supply is a high-efficiency direct-current power supply suitable for LED driving, which outputs stable direct-current voltage when being normally used, has the functions of safety protection and output cutoff during overload and can smoothly dim when an input end is accessed into a silicon controlled dimmer. Input voltage is sampled by a first operational amplifier module and is output to a first comparison module; the first comparison module outputs a voltage control signal according to the input voltage and second reference voltage; after receiving the voltage control signal, a switching control module controls the output voltage to be stabilized at a rated voltage value according to the voltage control signal; after the power supply input end is accessed into the silicon controlled dimmer, the first comparison module fails, a switching control module circuit becomes a voltage follower; the output direct-current voltage is changed along with the change of the conduction angle of the silicon controlled. Therefore, the LED driving power supply has the functions of voltage stabilization, overload protection and dimming.
Description
Technical field
The present invention relates to LED driving power, particularly relate to a kind of simple and reliable voltage stabilizing, band overload protection, Dimmable LED driving power circuit.
Background technology
LED driving power is that power supply supply is converted to specific electric current and voltage with the luminous power supply changeover device of driving LED.Generally: the input of LED driving power comprises high pressure industrial frequency AC (being civil power), low-voltage direct, high voltage direct current, low pressure high-frequency ac (as the output of electronic transformer) etc.The LED driving power using on the market now has linear power supply and Switching Power Supply.But these linear power supplies not tool have both voltage stabilizing and dimming function.And protection samples the efficiency that power consumption is large, reduced power supply when power supply transships.
Summary of the invention
Based on this, be necessary to provide a kind of simple and reliable voltage stabilizing, band overload protection, Dimmable LED driving power circuit.
A Dimmable LED driving power circuit, comprises the first amplifier module, the first comparison module, the second amplifier module, the second comparison module, switch control module and time-base integrated circuit;
Input sampling input voltage and first reference voltage of described the first amplifier module, the inverting input of the first comparison module described in the output termination of described the first amplifier module, the in-phase input end of described the first comparison module connects the second reference voltage, the control end of switch control module described in the output termination of described the first comparison module, the input termination power of described switch control module, the output termination LED driving power positive output end of described switch control module;
The in-phase input end of described the second amplifier module connects LED driving power negative output terminal, anti-phase input termination the 3rd reference voltage of described the second amplifier module, the inverting input of the second comparison module described in the output termination of described the second amplifier module, the in-phase input end of described the second comparison module connects the 4th reference voltage, the trigger end of time-base integrated circuit described in the output termination of described the second comparison module, the inverting input of the first comparison module described in described time-base integrated circuit output termination, the earth terminal ground connection of described time-base integrated circuit, the power supply termination input power of described time-base integrated circuit,
Described the first amplifier module is exported to the inverting input of described the first comparison module after the input voltage of sampling is amplified, described the first comparison module is according to input voltage and the second reference voltage output voltage control signal, and described voltage control signal is controlled the output voltage stabilization of described switch control module at load voltage value;
Described the second amplifier module samples load current, and the inverting input of described the second comparison module will be exported to after the load current amplification of sampling, when described load current exceeds load current value, the input voltage that described the second comparison module inverting input receives is higher than the 4th reference voltage of in-phase input end, described the second comparison module is to the trigger end output low level of described time-base integrated circuit, the output output low level of described time-base integrated circuit, the inverting input of described the first comparison module receives after low level, described the first comparison module output high level, described switch control module ends after receiving high level, described LED driving power stops powering to the load.
In an embodiment, described the first amplifier module comprises resistance R 4, resistance R 5, resistance R 6, resistance R 13, resistance R 16, swept resistance W4, swept resistance W12, voltage stabilizing didoe D1 and operational amplifier A 1 therein;
Described resistance R 4, described swept resistance W4, described resistance R 5 is series between the output and ground connection of described operational amplifier A 1 successively, described resistance R 6 is series between the output and in-phase input end of described operational amplifier A 1, described resistance R 13, described swept resistance W12 is series between the in-phase input end and ground connection of described operational amplifier A 1 successively, the plus earth of described voltage stabilizing didoe D1, the negative pole of described voltage stabilizing didoe D1 connects the in-phase input end of described operational amplifier A 1, swept resistance W4 and described resistance R 5 points of common connection described in the anti-phase input termination of described operational amplifier A 1, the power supply termination input power of described operational amplifier A 1, the output of operational amplifier A 1 described in described resistance R 16 1 terminations, the inverting input of the first comparison module described in another termination.
In an embodiment, described the first comparison module comprises comparator U1 and resistance R 3 therein;
The output of the first amplifier module described in the anti-phase input termination of described comparator U1, the in-phase input end of described comparator U1 connects the second reference voltage, and described resistance R 3 is series between the output and input power of described comparator U1.
In an embodiment, also comprise resistance R 1 and resistance R 2 therein;
Described resistance R 1 and described resistance R 2 are series between described LED driving power positive output end and ground connection, and the points of common connection of described resistance R 1 and described resistance R 2 connects the in-phase input end of described comparator U1.
In an embodiment, described the second amplifier module comprises sampling resistor R7, sampling resistor R11, resistance R 10, capacitor C 6 and operational amplifier A 2 therein;
Described sampling resistor R7, described sampling resistor R11, described capacitor C 6 are series at respectively between described LED driving power negative output terminal and ground connection;
The in-phase input end of described operational amplifier A 2 connects described LED driving power negative output terminal, anti-phase input termination the 3rd reference voltage of described operational amplifier A 2, resistance R 10 described in the output termination of described operational amplifier A 2, the inverting input of the second comparison module described in another termination of described resistance R 10.
In an embodiment, also comprise resistance R 8 and resistance R 9 therein;
Described resistance R 8 and described resistance R 9 are series between the output and ground connection of described operational amplifier A 2, and the points of common connection of described resistance R 8 and described resistance R 9 connects the inverting input of described operational amplifier A 2.
In an embodiment, described the second comparison module comprises comparator U2 and resistance R 14 therein;
The output of the second amplifier module described in the anti-phase input termination of described comparator U2, the in-phase input end of described comparator U2 connects the points of common connection of described resistance R 13 and described swept resistance W12, resistance R 14 described in the output termination of described comparator U2, the trigger end of time-base integrated circuit described in another termination of described resistance R 14.
Therein in an embodiment, base chip LM555, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, voltage stabilizing didoe D3, capacitor C 7, interrupteur SW 1, light-emitting diode D2 and triode Q1 when described time-base integrated circuit comprises;
Described resistance R 17 and described resistance R 21 are series between input power and ground connection, and described capacitor C 7 is parallel to respectively described resistance R 21 two ends with interrupteur SW 1; The points of common connection of described resistance R 17 and described resistance R 21 connects the reset terminal of base chip LM555 when described;
Described resistance R 20 and described voltage stabilizing didoe D3 are series between input power and ground connection, and the points of common connection of described resistance R 20 and described voltage stabilizing didoe D3 connects the power end of base chip LM555 when described; Wherein, the plus earth of described voltage stabilizing didoe D3;
Described resistance R 19 and described light-emitting diode D2 are series between the output and ground connection of base chip LM555 when described, wherein, and the minus earth of described light-emitting diode D2;
Described resistance R 18 is series between the output of described time chip LM555 and the base stage of described triode Q1, the grounded emitter of described triode Q1, and the collector electrode of described triode Q1 connects the inverting input of described the first comparison module.
In an embodiment, described switch control module comprises field effect transistor M2 therein, and the grid of described field effect transistor M2, source electrode and drain electrode correspond to control end, input and the output of described switch control module; Described field effect transistor M2 is P-channel field-effect transistor (PEFT) pipe.
In an embodiment, also comprise capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5 and resistance R 15 therein;
Described capacitor C 2 and described capacitor C 3 are parallel to respectively input power two ends, described capacitor C 4 and described resistance R 15 are series between input power positive pole and ground connection, and the points of common connection of described capacitor C 4 and described resistance R 15 connects the input of described the first amplifier module; Described capacitor C 5 is parallel between described LED driving power positive output end and negative output terminal.
Above-mentioned voltage stabilizing Dimmable LED driving power circuit passes through the first amplifier module samples input voltage, and will export to the first comparison module.The first comparison module is according to input voltage and the second reference voltage output voltage control signal, and according to voltage control signal, controls output voltage stabilization at load voltage value after switch control module receiver voltage control signal.The the first reference voltage size that changes the first amplifier module input, can correspondingly change the load voltage value that switch control module is controlled output.When LED driving power transships, the load current of the second amplifier module samples exceeds load current value, the second comparison module output low level, make time-base integrated circuit output low level, thereby the inverting input of the first comparison module is low level, the first corresponding comparison module will be exported high level, and then switch control module cut-off, and LED driving power stops load supplying.When power input access controllable silicon dimmer, the first comparison module lost efficacy, and switch control module circuit becomes a voltage follower, and the direct voltage of output changes along with the variation of silicon controlled angle of flow.Thereby can make LED driving power there is the function of voltage stabilizing, overload protection and tunable optical.
Accompanying drawing explanation
Fig. 1 is the module map of voltage stabilizing Dimmable LED driving power circuit;
Fig. 2 is the schematic diagram of voltage stabilizing Dimmable LED driving power circuit;
Fig. 3 is the major loop schematic diagram of voltage stabilizing Dimmable LED driving power.
Embodiment
As shown in Figure 1, be the module map of voltage stabilizing Dimmable LED driving power circuit.
A Dimmable LED driving power circuit, comprises the first amplifier module 101, the first comparison module 103, the second amplifier module 105, the second comparison module 107, switch control module 109 and time-base integrated circuit 111.
The input sampling input voltage of described the first amplifier module 101, the inverting input of the first comparison module 103 described in the output termination of described the first amplifier module 101, the in-phase input end of described the first comparison module 103 connects the second reference voltage, the control end of switch control module 109 described in the output termination of described the first comparison module 103, the input termination power of described switch control module 109, the output termination LED driving power positive output end of described switch control module 109.
The in-phase input end of described the second amplifier module 105 connects LED driving power negative output terminal, anti-phase input termination the 3rd reference voltage of described the second amplifier module 105, the inverting input of the second comparison module 107 described in the output termination of described the second amplifier module 105, the in-phase input end of described the second comparison module 107 connects the 4th reference voltage, the trigger end of time-base integrated circuit 111 described in the output termination of described the second comparison module 107, the inverting input of the first comparison module 103 described in described time-base integrated circuit 111 output terminations, the earth terminal ground connection of described time-base integrated circuit 111, the power supply termination input power of described time-base integrated circuit 111.
Described the first amplifier module 101 is exported to the inverting input of described the first comparison module 103 after the input voltage of sampling is amplified, described the first comparison module 103 is according to input voltage and the second reference voltage output voltage control signal, and described voltage control signal is controlled the output voltage stabilization of described switch control module 109 at load voltage value.
Described the second amplifier module 105 sampling load currents, and the inverting input of described the second comparison module 107 will be exported to after the load current amplification of sampling, when described load current exceeds load current value, the input voltage that described the second comparison module 107 inverting inputs receive is higher than the 4th reference voltage of in-phase input end, described the second comparison module 107 is to the trigger end output low level of described time-base integrated circuit 111, the output output low level of described time-base integrated circuit 111, the inverting input of described the first comparison module 103 receives after low level, described the first comparison module 103 output high level, after receiving high level, ends described switch control module 109, described LED driving power stops powering to the load.
The first amplifier module 101, for the input voltage of sampling, is exported to the first comparison module 103 after then the input voltage of sampling being amplified.The size of the first reference voltage of the first amplifier module 101 determines the output voltage size of the first amplifier module 101, and then can control the output voltage size of the first comparison module 103.Concrete, the first amplifier module 101 input voltages of sampling and the difference of the first reference voltage are exported to the first comparison module 103 after amplifying.Therefore, in the situation that the input voltage of sampling is constant, increase/reduce the first reference voltage, the output voltage of the first corresponding amplifier module 101 increases/reduces.
When LED driving power normal power supply, the first comparison module 103 is for the relatively output voltage of the first amplifier module 101 and the size of the second reference voltage, and according to comparative result output voltage control signal to switch control module 109.Particularly, the first comparison module 103 is adjusted the output voltage size of switch control module 109 according to the size of the output voltage of the first amplifier module 101 and the second reference voltage.
When LED driving power transships, the first comparison module 103 ends for control switch control module 109, thereby LED driving power is stopped load supplying, avoids producing damage because of overload.Concrete; when LED driving power transships; successively after the second amplifier module 105, the second comparison module 107 and time-base integrated circuit 111 are processed; export to the inverting input low level of the first comparison module 103; make the inverting input level of the first comparison module 103 be pulled low to 0; thereby the first comparison module 103 output high level; the control end of switch control module 109 receives after high level; switch control module 109 cut-offs; LED driving power stops load supplying, thereby protection LED driving power can not damage because of overload.
The second amplifier module 105 is for the load current of sampling, and the difference of load current and load current value is amplified and exported to the second comparison module 107.Particularly, at load current, during lower than load current value, the second amplifier module 105 output low levels are given the second comparison module 107.At load current, during higher than load current value, the second amplifier module 105 output high level are given the second comparison module 107.
The second comparison module 107 is according to the level of the second amplifier module 105 outputs and the 4th reference voltage size output triggering signal.Particularly, at the level of the second amplifier module 105 output during lower than the 4th reference voltage, the second comparison module 107 output high level.At the level of the second amplifier module 105 output during higher than the 4th reference voltage, the second comparison module 107 output low levels.
Time-base integrated circuit 111 is for when transshipping, and output low level, makes the first comparison module 103 output low level control switch control modules 109 cut-offs, and LED driving power is stopped load supplying.Particularly, when overload, the trigger end of time-base integrated circuit 111 receives low level, after processing via time-base integrated circuit 111, the output output low level of time-base integrated circuit 111 is given the inverting input of the first comparison module 103, thereby the first comparison module 103 output high level, and then 109 cut-offs of control switch control module, after switch control module 109 cut-offs, LED driving power also stops load supplying.
When LED driving power transships, after the second amplifier module 105 sampling load currents and the 3rd reference voltage amplification, export to the second comparison module 107.The level of the inverting input of the second comparison module 107 is higher than in-phase input end level, the second comparison module 107 output low levels.Thereby the trigger end of time-base integrated circuit 111 receives low level signal, time-base integrated circuit 111 is triggered, time-base integrated circuit 111 output low levels, drag down the first comparison module 103 inverting input level to 0, the first comparison module 103 output high level, thereby switch control module 109 control LED driving powers disconnections are connected with load.
Incorporated by reference to Fig. 2.
The first amplifier module 101 comprises resistance R 4, resistance R 5, resistance R 6, resistance R 13, resistance R 16, swept resistance W4, swept resistance W12, voltage stabilizing didoe D1 and operational amplifier A 1.
Described resistance R 4, described swept resistance W4, described resistance R 5 is series between the output and ground connection of described operational amplifier A 1 successively, described resistance R 6 is series between the output and in-phase input end of described operational amplifier A 1, described resistance R 13, described swept resistance W12 is series between the in-phase input end and ground connection of described operational amplifier A 1 successively, the plus earth of described voltage stabilizing didoe D1, the negative pole of described voltage stabilizing didoe D1 connects the in-phase input end of described operational amplifier A 1, swept resistance W4 and described resistance R 5 points of common connection described in the anti-phase input termination of described operational amplifier A 1, the power supply termination input power of described operational amplifier A 1, the output of operational amplifier A 1 described in described resistance R 16 1 terminations, the inverting input of the first comparison module 103 described in another termination.
The model of operational amplifier A 1 is LM324, LM224 or LM124.
The first comparison module 103 comprises comparator U1 and resistance R 3.
The output of the first amplifier module 101 described in the anti-phase input termination of described comparator U1, the in-phase input end of described comparator U1 connects the second reference voltage, and described resistance R 3 is series between the output and input power of described comparator U1.
Voltage stabilizing Dimmable LED driving power also comprises resistance R 1 and resistance R 2.
Described resistance R 1 and described resistance R 2 are series between described LED driving power positive output end and ground connection, and the points of common connection of described resistance R 1 and described resistance R 2 connects the in-phase input end of described comparator U1.Resistance R 1 equates with resistance R 2 resistances.
The second amplifier module 105 comprises sampling resistor R7, sampling resistor R11, resistance R 10, capacitor C 6 and operational amplifier A 2.
Described sampling resistor R7, described sampling resistor R11, described capacitor C 6 are series at respectively between described LED driving power negative output terminal and ground connection.
The in-phase input end of described operational amplifier A 2 connects described LED driving power negative output terminal, anti-phase input termination the 3rd reference voltage of described operational amplifier A 2, resistance R 10 described in the output termination of described operational amplifier A 2, the inverting input of the second comparison module 107 described in another termination of described resistance R 10.
The resistance of sampling resistor R7 and sampling resistor R11 is less, generally gets 0.05 Ω or 0.06 Ω.
The model of operational amplifier A 2 is LM324, LM224 or LM124.
Voltage stabilizing Dimmable LED driving power also comprises resistance R 8 and resistance R 9.
Described resistance R 8 and described resistance R 9 are series between the output and ground connection of described operational amplifier A 2, and the points of common connection of described resistance R 8 and described resistance R 9 connects the inverting input of described operational amplifier A 2.
The second comparison module 107 comprises comparator U2 and resistance R 14.
The output of the second amplifier module described in the anti-phase input termination of described comparator U2, the in-phase input end of described comparator U2 connects the points of common connection of described resistance R 13 and described swept resistance W12, resistance R 14 described in the output termination of described comparator U2, the trigger end of time-base integrated circuit described in another termination of described resistance R 14.
Base chip LM555, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, voltage stabilizing didoe D3, capacitor C 7, interrupteur SW 1, light-emitting diode D2 and triode Q1 when described time-base integrated circuit 111 comprises.
Described resistance R 17 and described resistance R 21 are series between input power and ground connection, and described capacitor C 7 is parallel to respectively described resistance R 21 two ends with interrupteur SW 1; The points of common connection of described resistance R 17 and described resistance R 21 connects the reset terminal of base chip LM555 when described.
Described resistance R 20 and described voltage stabilizing didoe D3 are series between input power and ground connection, and the points of common connection of described resistance R 20 and described voltage stabilizing didoe D3 connects the power end of base chip LM555 when described; Wherein, the plus earth of described voltage stabilizing didoe D3.
Described resistance R 19 and described light-emitting diode D2 are series between the output and ground connection of base chip LM555 when described, wherein, and the minus earth of described light-emitting diode D2.
Described resistance R 18 is series between the output of described time chip LM555 and the base stage of described triode Q1, the grounded emitter of described triode Q1, and the collector electrode of described triode Q1 connects the inverting input of described the first comparison module 103.
When in the time of In yet another embodiment,, base chip LM555 can adopt, base chip NE555 replaces.
Voltage stabilizing Dimmable LED driving power, also comprises capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5 and resistance R 15.
Described capacitor C 1, described capacitor C 2 and described capacitor C 3 are parallel to respectively input power two ends, described capacitor C 4 and described resistance R 15 are series between input power positive pole and ground connection, and the points of common connection of described capacitor C 4 and described resistance R 15 connects the input of described the first amplifier module 101; Described capacitor C 5 is parallel between described LED driving power positive output end and negative output terminal.
Based on above-mentioned all embodiment, the operation principle of voltage stabilizing Dimmable LED driving power circuit is as follows:
Input power via capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4 filtering, resistance R 15 dividing potential drops after, output to the power end of operational amplifier A 1.
The in-phase input end connecting resistance R1 of comparator U1 and the points of common connection of resistance R 2.The output voltage of the anti-phase input termination operational amplifier A 1 of comparator U1.
Time base chip LM555 trigger end receive after the low level of comparator U2 output, time base chip LM555 output high level.The base stage of triode Q1 by resistance R 18 with time base chip LM555 be connected, triode Q1 conducting.The collector electrode of triode Q1 is connected with the inverting input of comparator U1, thereby moves the anti-phase input terminal potential of comparator U1 to 0, and comparator U1 output high level makes field effect transistor M2 cut-off, and LED driving power stops load supplying.Time during base chip LM555 output high level, light-emitting diode D2 lights, indication LED driving power is in overload.
As shown in Figure 3, be the major loop schematic diagram of voltage stabilizing Dimmable LED driving power.
Voltage stabilizing Dimmable LED driving power, circuit is by the cooperation of system: transformer pressure-reducing, the rectification of Schottky rectifier bridge, electrochemical capacitor filtering, is used P-channel field-effect transistor (PEFT) power tube to do voltage stabilizing adjustment pipe, can reduce due to power consumption that pressure drop causes, reduce heating.By operational amplifier, detect output current simultaneously, reduce power consumption, heighten efficiency.Can make efficiency improve: by conventional 65%, to be increased to 75%.
Above-mentioned voltage stabilizing Dimmable LED driving power circuit passes through the first amplifier module 101 sampling input voltages, and will export to the first comparison module 103.The first comparison module 103 is according to input voltage and the second reference voltage output voltage control signal, and according to voltage control signal, controls output voltage stabilization at load voltage value after switch control module 109 receiver voltage control signals.The the first reference voltage size that changes the first amplifier module 101 inputs, can correspondingly change the load voltage value that switch control module 109 is controlled output.When LED driving power transships, the load current of the second amplifier module 105 samplings exceeds load current value, the second comparison module 107 output low levels, make time-base integrated circuit 111 output low levels, thereby the inverting input of the first comparison module 103 is low level, the first corresponding comparison module 103 will be exported high level, and then switch control module 109 cut-offs, and LED driving power stops load supplying.Avoid, because of overload, LED driving power is caused to damage.
Voltage stabilizing Dimmable LED driving power has the direct voltage of stable output while being a kind of normal use; When overload, there is safeguard protection, cut off the function of output; Level and smooth a kind of high efficiency DC power supply that is suitable for LED driving of light modulation when input access controllable silicon dimmer.When power input access controllable silicon dimmer, the first comparison module 103 lost efficacy, and switch control module 109 circuit become a voltage follower, and the direct voltage of output changes along with the variation of silicon controlled angle of flow.Thereby can make LED driving power there is the function of voltage stabilizing, overload protection and tunable optical.When power input access controllable silicon dimmer, circuit can become a voltage follower, and the direct voltage of output changes along with the variation of silicon controlled angle of flow.Thereby can make LED driving power there is the function of voltage stabilizing, overload protection and tunable optical.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a voltage stabilizing Dimmable LED driving power circuit, is characterized in that, comprises the first amplifier module, the first comparison module, the second amplifier module, the second comparison module, switch control module and time-base integrated circuit;
Input sampling input voltage and first reference voltage of described the first amplifier module, the inverting input of the first comparison module described in the output termination of described the first amplifier module, the in-phase input end of described the first comparison module connects the second reference voltage, the control end of switch control module described in the output termination of described the first comparison module, the input termination power of described switch control module, the output termination LED driving power positive output end of described switch control module;
The in-phase input end of described the second amplifier module connects LED driving power negative output terminal, anti-phase input termination the 3rd reference voltage of described the second amplifier module, the inverting input of the second comparison module described in the output termination of described the second amplifier module, the in-phase input end of described the second comparison module connects the 4th reference voltage, the trigger end of time-base integrated circuit described in the output termination of described the second comparison module, the inverting input of the first comparison module described in described time-base integrated circuit output termination, the earth terminal ground connection of described time-base integrated circuit, the power supply termination input power of described time-base integrated circuit,
Described the first amplifier module is exported to the inverting input of described the first comparison module after the input voltage of sampling is amplified, described the first comparison module is according to input voltage and the second reference voltage output voltage control signal, and described voltage control signal is controlled the output voltage stabilization of described switch control module at load voltage value;
Described the second amplifier module samples load current, and the inverting input of described the second comparison module will be exported to after the load current amplification of sampling, when described load current exceeds load current value, the input voltage that described the second comparison module inverting input receives is higher than the 4th reference voltage of in-phase input end, described the second comparison module is to the trigger end output low level of described time-base integrated circuit, the output output low level of described time-base integrated circuit, the inverting input of described the first comparison module receives after low level, described the first comparison module output high level, described switch control module ends after receiving high level, described LED driving power stops powering to the load.
2. voltage stabilizing Dimmable LED driving power circuit according to claim 1, it is characterized in that, described the first amplifier module comprises resistance R 4, resistance R 5, resistance R 6, resistance R 13, resistance R 16, swept resistance W4, swept resistance W12, voltage stabilizing didoe D1 and operational amplifier A 1;
Described resistance R 4, described swept resistance W4, described resistance R 5 is series between the output and ground connection of described operational amplifier A 1 successively, described resistance R 6 is series between the output and in-phase input end of described operational amplifier A 1, described resistance R 13, described swept resistance W12 is series between the in-phase input end and ground connection of described operational amplifier A 1 successively, the plus earth of described voltage stabilizing didoe D1, the negative pole of described voltage stabilizing didoe D1 connects the in-phase input end of described operational amplifier A 1, swept resistance W4 and described resistance R 5 points of common connection described in the anti-phase input termination of described operational amplifier A 1, the power supply termination input power of described operational amplifier A 1, the output of operational amplifier A 1 described in described resistance R 16 1 terminations, the inverting input of the first comparison module described in another termination.
3. voltage stabilizing Dimmable LED driving power circuit according to claim 1, is characterized in that, described the first comparison module comprises comparator U1 and resistance R 3;
The output of the first amplifier module described in the anti-phase input termination of described comparator U1, the in-phase input end of described comparator U1 connects the second reference voltage, and described resistance R 3 is series between the output and input power of described comparator U1.
4. voltage stabilizing Dimmable LED driving power circuit according to claim 3, is characterized in that, also comprises resistance R 1 and resistance R 2;
Described resistance R 1 and described resistance R 2 are series between described LED driving power positive output end and ground connection, and the points of common connection of described resistance R 1 and described resistance R 2 connects the in-phase input end of described comparator U1.
5. voltage stabilizing Dimmable LED driving power circuit according to claim 1, is characterized in that, described the second amplifier module comprises sampling resistor R7, sampling resistor R11, resistance R 10, capacitor C 6 and operational amplifier A 2;
Described sampling resistor R7, described sampling resistor R11, described capacitor C 6 are series at respectively between described LED driving power negative output terminal and ground connection;
The in-phase input end of described operational amplifier A 2 connects described LED driving power negative output terminal, anti-phase input termination the 3rd reference voltage of described operational amplifier A 2, resistance R 10 described in the output termination of described operational amplifier A 2, the inverting input of the second comparison module described in another termination of described resistance R 10.
6. voltage stabilizing Dimmable LED driving power circuit according to claim 5, is characterized in that, also comprises resistance R 8 and resistance R 9;
Described resistance R 8 and described resistance R 9 are series between the output and ground connection of described operational amplifier A 2, and the points of common connection of described resistance R 8 and described resistance R 9 connects the inverting input of described operational amplifier A 2.
7. voltage stabilizing Dimmable LED driving power circuit according to claim 2, is characterized in that, described the second comparison module comprises comparator U2 and resistance R 14;
The output of the second amplifier module described in the anti-phase input termination of described comparator U2, the in-phase input end of described comparator U2 connects the points of common connection of described resistance R 13 and described swept resistance W12, resistance R 14 described in the output termination of described comparator U2, the trigger end of time-base integrated circuit described in another termination of described resistance R 14.
8. voltage stabilizing Dimmable LED driving power circuit according to claim 1, it is characterized in that base chip LM555, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, voltage stabilizing didoe D3, capacitor C 7, interrupteur SW 1, light-emitting diode D2 and triode Q1 when described time-base integrated circuit comprises;
Described resistance R 17 and described resistance R 21 are series between input power and ground connection, and described capacitor C 7 is parallel to respectively described resistance R 21 two ends with interrupteur SW 1; The points of common connection of described resistance R 17 and described resistance R 21 connects the reset terminal of base chip LM555 when described;
Described resistance R 20 and described voltage stabilizing didoe D3 are series between input power and ground connection, and the points of common connection of described resistance R 20 and described voltage stabilizing didoe D3 connects the power end of base chip LM555 when described; Wherein, the plus earth of described voltage stabilizing didoe D3;
Described resistance R 19 and described light-emitting diode D2 are series between the output and ground connection of base chip LM555 when described, wherein, and the minus earth of described light-emitting diode D2;
Described resistance R 18 is series between the output of described time chip LM555 and the base stage of described triode Q1, the grounded emitter of described triode Q1, and the collector electrode of described triode Q1 connects the inverting input of described the first comparison module.
9. voltage stabilizing Dimmable LED driving power circuit according to claim 1, it is characterized in that, described switch control module comprises field effect transistor M2, and the grid of described field effect transistor M2, source electrode and drain electrode correspond to control end, input and the output of described switch control module; Described field effect transistor M2 is P-channel field-effect transistor (PEFT) pipe.
10. voltage stabilizing Dimmable LED driving power circuit according to claim 1, is characterized in that, also comprises capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5 and resistance R 15;
Described capacitor C 2 and described capacitor C 3 are parallel to respectively input power two ends, described capacitor C 4 and described resistance R 15 are series between input power positive pole and ground connection, and the points of common connection of described capacitor C 4 and described resistance R 15 connects the input of described the first amplifier module; Described capacitor C 5 is parallel between described LED driving power positive output end and negative output terminal.
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