CN106793346A - Low-voltage dimming power source - Google Patents
Low-voltage dimming power source Download PDFInfo
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- CN106793346A CN106793346A CN201710146238.9A CN201710146238A CN106793346A CN 106793346 A CN106793346 A CN 106793346A CN 201710146238 A CN201710146238 A CN 201710146238A CN 106793346 A CN106793346 A CN 106793346A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
The present invention relates to a kind of low-voltage dimming power source, it includes EMI filter circuit, pfc circuit module, DC DC circuit modules, low voltage start circuit, alternating current sample circuit, dim signal output circuit and the adjustable optical circuit of constant current；Pfc circuit module is connected to EMI filter circuit；DC DC circuit modules are connected to pfc circuit module；Low voltage start circuit is used to be powered to pfc circuit module and DC DC circuit modules；Alternating current sample circuit is used to sample the carrying out of alternating current；Dim signal output circuit is connected to alternating current sample circuit；For receiving the sampled signal of alternating current sample circuit output, and export corresponding dim signal；Constant current is adjustable, and optical circuit is connected to dim signal output circuit and DC DC circuit modules；For receiving dim signal and exporting corresponding constant current.The present invention is set by the input of low alternating voltage, reduces the application risk of user；By the setting of the adjustable optical circuit of constant current and dim signal output circuit so that brightness of the invention is adjustable, energy consumption is saved.
Description
Technical field
The present invention relates to field of power supplies, more specifically to a kind of low-voltage dimming power source.
Background technology
With the development of power technology, power supply is employed for every field.And in field of traffic lights, used at present
Traffic lights is high-voltage alternating (85-264V AC) input, there is certain Electrical Safety hidden danger, simultaneously as existing traffic
Lamp, cannot when needing to reduce traffic lights luminosity in night or extraneous light weaker environment without brightness control function
Realize, i.e., energy-conservation is not environmentally yet.
Therefore a kind of low-voltage input and the adjustable power supply of luminosity need to be developed.
The content of the invention
The invention provides it is a kind of for the input of low alternating current, reduce Electrical Safety hidden danger and traffic lights luminance
The low-voltage dimming power source of adjustable low energy consumption is spent, the high-voltage alternating input for solving existing traffic lights has potential safety hazard
And the nonadjustable technical problem of traffic lights luminosity.
The technical solution adopted for the present invention to solve the technical problems is：A kind of low-voltage dimming power source is constructed, it includes：
EMI filter circuit, for being filtered treatment to low-voltage AC, and exports first voltage；
Pfc circuit module, is connected to the EMI filter circuit；For receiving the first voltage, and output HIGH voltage
Second voltage；
DC-DC circuit module, is connected to the pfc circuit module；For the second voltage to be converted into low-voltage
Tertiary voltage, and powered to the adjustable optical circuit of constant current；
Low voltage start circuit, for the pfc circuit module and DC-DC circuit module for power supply；
Alternating current sample circuit, samples for the carrying out to alternating current；
Dim signal output circuit, is connected to the alternating current sample circuit；For receiving the alternating current sample circuit
The sampled signal of output, and export corresponding dim signal；
The adjustable optical circuit of constant current, is connected to the dim signal output circuit and DC-DC circuit module；For receiving
The dim signal, and export corresponding constant current.
In the present invention, the alternating current sample circuit includes the 34th resistance, the 36th resistance, current transformer
With LM358 operational amplifiers；
The current transformer electrode input end is connected to alternating current fire wire, the electric current by the 34th resistance
The cathode output end of transformer is connected to the dim signal output circuit by the 36th resistance, and the electric current is mutual
The cathode output end of sensor is connected to the IN1- pin of the LM358 operational amplifiers, the cathode output end of the current transformer
It is connected between the IN1+ pin of the LM358 operational amplifiers, and the IN1- pin and OUT1 pin of the LM358 operational amplifiers and connects
It is connected to the 36th resistance, the VCC pin of the LM358 operational amplifiers are connected to described by the 5th voltage-regulator diode
The output end of DC-DC circuit module.
In the present invention, the dim signal output circuit includes L7805 voltage stabilizing chips, PIC16F1823 chips, first
Isolating diode, the second isolating diode, the 49th resistance and the 50th resistance；
The input pin of the L7805 voltage stabilizing chips is connected to the output end of the DC-DC circuit module, and the L7805 is steady
The output pin of pressure chip is connected to the VDD pin of the PIC16F1823 chips, and the VSS pin of the PIC16F1823 chips pass through institute
The input that the 50th resistance is connected to second isolating diode is stated, 8 pin of the PIC16F1823 chips are connected to institute
State the output end of alternating current sample circuit, 9 pin of the PIC16F1823 chips are connected to described by the first isolating diode
The signal receiving end of constant current is adjustable optical circuit, 14 pin of the PIC16F1823 chips are by the 49th resistance connected
With the signal receiving end that second isolating diode is connected to the adjustable optical circuit of the constant current.
In the present invention, the adjustable optical circuit of the constant current includes PT4115 chips, the 44th resistance, the 45th resistance
With the 4th inductance；
44th resistance and the 45th resistor coupled in parallel form resistance combination, and the resistance combination is connected to institute
State between the VIN pin of PT4115 chips and CSN pin, the VIN pin of the PT4115 chips are connected to the DC-DC circuit module
Output end, the DIM pin of the PT4115 chips are connected to the signal output part of the dim signal output circuit, the PT4115
The SW pin of chip are connected between the 4th inductance and the 9th diode, and the output end of the 9th diode is connected to described
Resistance combines and the CSN pin of the PT4115 chips between and is connected to the resistance combination and the PT4115 chips
Between VIN pin.
In the present invention, the low voltage start circuit includes the first voltage-regulator diode, the second voltage-regulator diode, the one or three
Level pipe, the second triode and the 3rd diode；
Wherein, the output end of the pfc circuit module is connected to second voltage-regulator diode by the 18th resistance
Input, the output head grounding of second voltage-regulator diode, the output end of the pfc circuit module is connected by the 19th resistance
The colelctor electrode of second triode is connected to, the base stage of second triode is connected to the input of second voltage-regulator diode
End, the emitter stage of the second triode is connected to the input of the 3rd diode, the output end connection of the 3rd diode
The pfc circuit module is connected in the output end of the DC-DC circuit module, and the 3rd diode；
The colelctor electrode of first triode is connected to the base stage of second triode, the transmitting of first triode
Pole is grounded, and the base stage of first triode is connected to the output end of first voltage-regulator diode, institute by the 17th resistance
The input for stating the first voltage-regulator diode is connected to the DC-DC circuit module.
In the present invention, the pfc circuit module includes being connected to the full bridge rectifier of the EMI filter circuit, connects
The π types filter circuit of the full bridge rectifier is connected to, the input sampling circuit of the π types filter circuit is connected to, is connected to
The booster circuit of the π types filter circuit, the output sample circuit for being connected to the booster circuit and it is connected to the input
The L6562 chips of sample circuit, the booster circuit and the output sample circuit；
The input sampling circuit includes the 4th resistance, the 5th resistance, the 6th resistance and the 3rd electric capacity, described the of series connection
One end of four resistance and the 5th resistance is connected to the π types filter circuit, and the other end is by the 6th resistance in parallel and the
Three capacitance connections are in the MULT pin of the L6562 chips；
The booster circuit includes the 3rd inductance, the second diode, the first metal-oxide-semiconductor, the 13rd resistance and the 9th electric capacity, institute
The input for stating the 3rd inductance is connected to the π types filter circuit, and the input of second diode is connected to the described 3rd
The output end of inductance, the output end of second diode is connected to the 9th electric capacity, and the input of first metal-oxide-semiconductor connects
The output end of the 3rd inductance is connected to, the control end of first metal-oxide-semiconductor is connected to the GD pin of the L6562 chips, described
The output end of the first metal-oxide-semiconductor is connected to the 13rd resistance of ground connection, and the 13rd resistance passes through the 8th capacitance connection
In the CS pin of the L6562 chips；
The output sample circuit includes the 14th resistance, the 15th resistance and the 16th resistance, the described tenth of series connection the
One end of four resistance and the 15th resistance is connected to the output end of the second diode, the 14th resistance of series connection and the 15th
The other end of resistance is connected to the INV pin of the L6562 chips and the 16th resistance of ground connection；
The VCC pin of the L6562 chips are by the 4th electric capacity and the 5th capacitance connection in the output of the 3rd diode
End.
In the present invention, the DC-DC circuit module includes being connected to the chip controls of the pfc circuit module output end
Circuit, the clamp circuit for being connected to the chip control circuit, the first rectifying and wave-filtering electricity for being connected to the chip control circuit
Road, the chip protection circuit for being connected to first current rectifying and wave filtering circuit, the second rectification for being connected to the chip control circuit
Filter circuit, the output feedback circuit for being connected to second current rectifying and wave filtering circuit and be connected to the chip control circuit,
The OB5269 chips of the chip protection circuit and the output feedback circuit；
The chip control circuit include the second metal-oxide-semiconductor, the 32nd resistance and with primary winding, the first auxiliary winding and
The transformer of the second auxiliary winding, the input of the primary winding is connected to the output end of the pfc circuit module, the primary winding
Output end be connected to the input of second metal-oxide-semiconductor, the control end of second metal-oxide-semiconductor is connected to the OB5269 chips
DRV pin, the output end of second metal-oxide-semiconductor is connected to the 32nd resistance of ground connection, and the 32nd resistance leads to
The 13rd capacitance connection is crossed in the CS pin of the OB5269 chips；
The clamp circuit includes the tenth electric capacity, the 22nd resistance, the 20th three-circuit and the 4th diode, described the
22 resistance and the 23rd resistant series, and one parallel combination of formation in parallel with the tenth electric capacity；Four or two pole
The input of pipe is connected to the output end of the primary winding, and the output end of the 4th diode is connected to the parallel combination
One end, the input of the primary winding is connected to the other end of the parallel combination；
First current rectifying and wave filtering circuit includes the 6th diode and the 15th electric capacity, the input of the 6th diode
The positive terminal of the first auxiliary winding is connected to, the output end of the 6th diode is connected to the described tenth by the 24th resistance
The positive pole of five electric capacity, the negative pole of the 15th electric capacity is connected to the negative pole end of first auxiliary winding；
The chip protection circuit includes the 4th voltage-regulator diode, the 26th resistance, the 11st electric capacity and the four or three pole
Pipe, the input of the 4th voltage-regulator diode is connected to the positive pole of the 15th electric capacity, the 4th voltage-regulator diode
Output end by connect the 26th resistance and the 11st capacity earth, and the 4th voltage-regulator diode output end
It is connected to the base stage of the 4th triode by the 26th resistance, the colelctor electrode of the 4th triode is connected to described
The RT pin of OB5269 chips, the grounded emitter of the 4th triode；
Second current rectifying and wave filtering circuit includes the 8th diode and the 18th electric capacity, the input of the 8th diode
The positive terminal of second auxiliary winding is connected to, the positive pole of the 18th electric capacity is connected to the output of the 8th diode
End, the negative pole of the 18th electric capacity is connected to the negative pole end of second auxiliary winding；
The output feedback circuit includes optocoupler, the 42nd resistance, the 43rd resistance, controllable accurate source of stable pressure, institute
The input for stating the light emitting diode of optocoupler is connected to the positive terminal of second auxiliary winding, the light emitting diode of the optocoupler
Output end is connected to the negative electrode of the controllable accurate source of stable pressure, and the colelctor electrode of the phototriode of the optocoupler is connected to described
The FB pin of OB5269 chips, the grounded emitter of the phototriode of the optocoupler；The anode of the controllable accurate source of stable pressure connects
Ground and the anode of the controllable accurate source of stable pressure and with reference to the 43rd resistance is connected between pole, the controllable accurate is steady
The 42nd resistance is connected between the output end of the reference pole of potential source and second current rectifying and wave filtering circuit；
The VDD pin of the OB5269 chips are connected to the output of the 3rd diode by the 3rd current rectifying and wave filtering circuit
End；The positive pole of the 15th electric capacity is connected to the input of first voltage-regulator diode.
In the present invention, the 18th electric capacity and the 15th electric capacity are electrochemical capacitor.
Implement low-voltage dimming power source of the invention, have the advantages that：First, by the input of low alternating voltage
Set, reduce potential safety hazard during using electricity；Second, by alternating current sample circuit, dim signal output circuit and constant current
The setting of adjustable optical circuit so that the luminosity of traffic lights is adjustable, so as to realize the effect of energy-conserving and low energy consumption, alternating current in addition
Sampled signal causes the stability of the output current of circuit by the treatment of dim signal output circuit and the adjustable optical circuit of constant current
It is higher；3rd, by the setting of low voltage start circuit, shorten the startup time of the invention.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is a kind of circuit schematic flow sheet of the preferred embodiment of low-voltage dimming power source of the invention；
Fig. 2 is a kind of electrical block diagram of the preferred embodiment of low-voltage dimming power source of the invention；
Fig. 3 is the electrical block diagram of the alternating current sample circuit in Fig. 2；
Fig. 4 is the electrical block diagram of the dim signal output circuit in Fig. 2；
Fig. 5 is the electrical block diagram of the adjustable optical circuit of constant current in Fig. 2；
Fig. 6 is the electrical block diagram of the low voltage start circuit in Fig. 2；
Fig. 7 is the electrical block diagram of the pfc circuit module in Fig. 2；
Fig. 8 is the electrical block diagram of the EMI filter circuit in Fig. 2；
Fig. 9 is the electrical block diagram of the DC-DC circuit module in Fig. 2.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As depicted in figs. 1 and 2, Fig. 1 is a kind of circuit schematic flow sheet of low-voltage dimming power source of the invention；Fig. 2 is
A kind of electrical block diagram of low-voltage dimming power source of the invention；A kind of low-voltage dimming power source 100 includes EMI filtered electricals
Road 10, pfc circuit module 20, DC-DC circuit module 30, low voltage start circuit 40, alternating current sample circuit 50, dim signal
Output circuit 60 and the adjustable optical circuit 70 of constant current.
EMI filter circuit 10 is used to be filtered low-voltage AC treatment, and exports first voltage；Pfc circuit module
20 are connected to EMI filter circuit 10, and it is used to receiving first voltage, and output HIGH voltage second voltage；DC-DC circuit module
30 are connected to pfc circuit module 20, and it is used to be converted into second voltage the tertiary voltage of low-voltage, and gives constant current adjustable photoelectricity
Road 70 powers；Low voltage start circuit 40 is used to be powered to pfc circuit module 20 and DC-DC circuit module 30；Alternating current is sampled
Circuit 50 is used to sample the carrying out of alternating current；Dim signal output circuit 60 is connected to alternating current sample circuit 50, and it is used for
The sampled signal of the output of alternating current sample circuit 50 is received, and exports corresponding dim signal；Constant current is adjustable, and optical circuit 70 is connected
In dim signal output circuit 60 and DC-DC circuit module 30, it is used to receive dim signal, and exports corresponding constant electricity
Stream.
Present invention is mainly used for powering load, the load is in a preferred embodiment of the invention traffic lights, and this is excellent
Select the input voltage of embodiment relatively low compared to the input voltage of existing traffic lights, the input voltage of this preferred embodiment is low
Pressure alternating current voltage, is 20V-50V optionally, and the input voltage of existing traffic lights is 85V-264V AC.Therefore, show and
It is clear to, the present invention plays the effect of the use potential safety hazard for greatly reducing traffic lights.
The flow of powering load of the present invention is：Low-voltage ac voltage after the filtering process of EMI filter circuit 10 by converting
It is first voltage；First voltage becomes DC voltage by the full-bridge rectifier filter in pfc circuit module 20 again, and pfc circuit will
The DC voltage carries out boosting and is converted into second voltage；Second voltage flows into DC-DC circuit module 30 below and through DC-DC electricity
A stabilization, stable tertiary voltage are obtained after the second current rectifying and wave filtering circuit 34 in road module 30；The tertiary voltage is by below
The adjustable optical circuit 70 of constant current after provide constant electric current to the load of power supply institute band.
The flow of the input voltage signal sampling of this preferred embodiment, signal transacting, dim signal output and light modulation is：
AC-input voltage becomes the sampled voltage of amplitude very little after alternating current sample circuit 50, and the sampled voltage is admitted to light modulation letter
Number output circuit 60, judges the size of AC-input voltage, and the size further according to input voltage exports dim signal to constant current
Adjustable optical circuit 70, the output current of constant current the is adjustable whole power supply of optical circuit 70 pairs is controlled, so as to change the hair of traffic lights
Brightness.
Fig. 3 is refer to, in the present invention, alternating current sample circuit 50 includes the 34th resistance R34, the 36th resistance
R36, current transformer W1 and LM358 operational amplifier U3；
Current transformer W1 electrode input ends AC+ is connected to alternating current fire wire L by the 34th resistance R34, and electric current is mutual
The cathode output end OUT+ of sensor W1 is connected to the signal input part of dim signal output circuit 60 by the 36th resistance R36
S, and the cathode output end OUT+ of current transformer W1 is connected to the IN1- pin of LM358 operational amplifiers U3, current transformer W1
Cathode output end OUT- be connected to the IN1+ pin of LM358 operational amplifiers U3, and the IN1- pin of LM358 operational amplifiers U3 and
The 36th resistance R36 is connected between OUT1 pin, the VCC pin of LM358 operational amplifiers U3 pass through the 5th voltage-regulator diode ZD5
It is connected to the output end LED+ of DC-DC circuit module 30.
In this alternating current sample circuit 50, input AC electricity arrives electric current by current-limiting resistance (the 34th resistance R34)
Transformer W1, input current size is Vin/R34, and current waveform is the sine wave with input voltage same-phase.In Current Mutual Inductance
The output end of device W1 can induce the electric current as input, and size is Vin/R34, and the electric current passes through the 36th resistance
Be changed into voltage signal after R36, the voltage signal is sampled voltage and the OUT1 pin from LM358 operational amplifiers U3 export into
Enter the signal input part S of dim signal output circuit 60, voltage swing is Vin/R34*R36.
Wherein, the model ZMPT107 of current transformer W1, in alternating current sample circuit 50, due to current transformer
The high_voltage isolation of W1, improves the security of sampling.In addition, in alternating current sample circuit 50, except LM358 operational amplifiers
Outside U3, the component of other easy temperature influences is not used, therefore, sample circuit temperature influence is small, meanwhile, what is used is essence
Close current transformer W1 (ZMPT107), it is ensured that the accuracy of sampling；On the other hand, when the voltage range of sampling output will
Ask than larger, output voltage needs to use LM358 operational amplifiers U3 to adopting when having exceeded the saturation voltage of current transformer W1
Sample signal is amplified, and using this kind of circuit sampling high precision, load capacity is strong.
Fig. 4 is refer to, in the present invention, dim signal output circuit 60 includes L7805 voltage stabilizing chips U5, PIC16F1823
Chip U6, the first isolating diode D10, the second isolating diode D11, the 49th resistance R49 and the 50th resistance R50；
The input pin of L7805 voltage stabilizing chips U5 is connected to output end LED+, L7805 the voltage stabilizing core of DC-DC circuit module 30
The output pin of piece U5 is connected to the VDD pin (1 pin) of PIC16F1823 chips U6, and the VSS pin (2 pin) of PIC16F1823 chips U6 lead to
The input that the 50th resistance R50 is connected to the second isolating diode D11 is crossed, 8 pin of PIC16F1823 chips U6 are connected to friendship
The output end of the electric sample circuit 50 of stream, 9 pin of PIC16F1823 chips U6 are connected to constant current by the first isolating diode D10 can
14 pin of signal receiving end DIM, the PIC16F1823 chip U6 of light adjusting circuit 70 are by the 49th resistance R49 for connecting and the
Two isolating diode D11 are connected to the signal receiving end DIM of the adjustable optical circuit 70 of constant current.
It should be noted that signal input part S of 8 pin of PIC16F1823 chips U6 for dim signal output circuit 60.
Sampled voltage is sent to 8 pin of PIC16F1823 chips U6, and the sampled voltage size for receiving is passed through
The numerical value of the inner setting of PIC16F1823 chips U6 is compared to determine the output of dim signal；L7805 voltage stabilizing chips U5
The 5V voltages of stabilization are provided for the normal work of PIC16F1823 chips U6；Two poles of the isolation of first isolating diode D10 and second
Pipe D11 is to prevent interfering between dim signal.
Fig. 5 is refer to, in the present invention, constant current is adjustable, and optical circuit 70 includes PT4115 chips U4, the 44th resistance
R44, the 45th resistance R45 and the 4th inductance L4；
44th resistance R44 and the 45th resistance R45 is in parallel to form resistance combination, and resistance combination is connected to
Between the VIN pin and CSN pin of PT4115 chips U4, the VIN pin of PT4115 chips U4 are connected to the output of DC-DC circuit module 30
End LED+, the DIM pin of PT4115 chips U4 are connected to the signal output part of dim signal output circuit, the SW of PT4115 chips U4
Pin is connected between the 4th inductance L4 and the 9th diode D9, the output end of the 9th diode D9 be connected to resistance combination and
Between the CSN pin of PT4115 chips U4 and be connected to resistance combination and the VIN pin of PT4115 chips U4 between.
It should be noted that signal receiving end DIM of the DIM pin of PT4115 chips U4 for the adjustable optical circuit 70 of constant current, perseverance
The electric current of the output stabilization of adjustable optical circuit 70 is flowed for load traffic lights is powered.The output current of this preferred embodiment is by PT4115
The voltage control of the DIM pin of chip U4.
Specifically, the voltage signal and PIC16F1823 chip U6 inner settings for obtaining of being sampled by alternating current sampling circuit 50
Magnitude of voltage compare, such as when alternating current input voltage is less than 20V AC or during higher than 50V AC, PIC16F1823 chips U6
The dim signal Vdim ＜ 0.3V of output, constant current is adjustable, and optical circuit 70 is exported without electric current；When alternating current input voltage is in 20-
During 38V AC, the 14 pin output high level 5V of PIC16F1823 chips U6,5V voltages pass through the 49th resistance R49, the 50th
Dim signal (Vdim is 1.25V) is obtained after resistance R50 partial pressures, now constant current is adjustable, and the output current of optical circuit 70 is about 300mA,
When alternating current input voltage is in 38-50V AC, (Vdim ≈ 5.0V are big for the 9 pin output dim signal of PIC16F1823 chips U6
In 2.5V), the output current of optical circuit 70 that constant current is adjustable is for maximum is about 600mA.Therefore, as long as dim signal output circuit 60
Different dimmer voltage values to DIM pin are given to, it is possible to control the size of the output current value of whole power supply, so as to realize light modulation
Function.In addition, the size of the adjustable output current value of optical circuit 70 of constant current and the dimmer voltage of dim signal output circuit 60
Scope can be configured according to the requirement of client.
Therefore, the two stage treatment of sampled signal is made by dim signal output circuit 60 and constant current adjustable optical circuit 70
Of the invention must export more stable to the electric current of load；Relative to existing for the coagulation of sampled signal, at one-level
Comprehend and arise a problem that, be exactly that such as input voltage is small up and down in dimmer voltage critical value 38V when input voltage is unstable
When scope fluctuates, then export the phenomenon that fluctuation just occurs to the output current of load.And two stage treatment of the invention,
Just be not in above-mentioned phenomenon so that the stability of output circuit is higher.
Fig. 6 is refer to, in the present invention, low voltage start circuit 40 includes the first voltage-regulator diode ZD1, the second voltage stabilizing two
Pole pipe ZD2, the first triode Q3, the second triode Q4 and the 3rd diode D3；
Wherein, the output end PFC of pfc circuit module 20 is connected to the second voltage-regulator diode ZD2 by the 18th resistance R18
Input, the output head grounding of the second voltage-regulator diode ZD2, the output end PFC of pfc circuit module passes through the 19th resistance
R19 is connected to the colelctor electrode of the second triode Q4, and the base stage of the second triode Q4 is connected to the input of the second voltage-regulator diode ZD2
End, the emitter stage of the second triode Q4 is connected to the input of the 3rd diode D3, and the output end of the 3rd diode D3 is connected to
DC-DC circuit module 20, and the output end of the 3rd diode D3 is connected to pfc circuit module 20；
The colelctor electrode of the first triode Q3 is connected to the base stage of the second triode Q4, and the emitter stage of the first triode Q3 connects
Ground, the base stage of the first triode Q3 is connected to the output end of the first voltage-regulator diode ZD1 by the 17th resistance R17, and first is steady
The input of pressure diode ZD1 is connected to DC-DC circuit module 30.
The operation principle of low voltage start circuit 40 is：The PFC voltages that pfc circuit module 20 comes after energization pass through the tenth
Eight resistance R18 turn on the second voltage-regulator diode ZD2, and now the cathode voltage of the second voltage-regulator diode ZD2 is the second voltage stabilizing two
The voltage stabilizing value of pole pipe ZD2, this voltage is added in the base stage of the second triode Q4, turns on the second triode Q4, the second triode Q4
PFC voltages give pfc circuit mould by starting resistance (the 19th resistance R19), the second triode Q4, the 3rd diode D3 after conducting
The L6562 chips U1 of block 20 and the OB5269 chip power supplies of DC-DC circuit module 30, because the 19th resistance R19 values are smaller,
So the present invention can quickly start.
In addition, after normal work of the present invention, the supply voltage of DC-DC circuit module 30 rises so that tie point Vcc,
Tie point PFC Vcc voltages rise, and the voltage is used to maintain the normal work of the present invention and pfc circuit module 20, meanwhile, the electricity
Pressure can make the first triode Q3 saturation conductions, its current collection after the first triode Q3 saturation conductions by the first voltage-regulator diode ZD1
Voltage Vce ≈ 0.1V between pole and emitter stage, so as to drag down the second triode Q4 base voltages, close the second triode Q4
It is disconnected, no electric current on resistance (the 19th resistance R19) is started after the second triode Q4 shut-offs and is flowed through, the consumption of noenergy.Therefore, it is low
Voltage startup circuit 40 can reach the effect of quick startup, and extra power consumption will not be increased again.
Fig. 7 is refer to, in the present invention, pfc circuit module 20 includes being connected to the full-bridge rectification electricity of EMI filter circuit 10
Road 21, the π types filter circuit 22 for being connected to full bridge rectifier 21, the input sampling circuit 23 for being connected to π types filter circuit 22,
The booster circuit 24 that is connected to π types filter circuit 22, the output sample circuit 25 for being connected to booster circuit 24 and it is connected to defeated
Enter the L6562 chips U1 of sample circuit 23, booster circuit 24 and output sample circuit 25；
Input sampling circuit 23 includes the 4th resistance R4, the 5th resistance R5, the 6th resistance 56 and the 3rd electric capacity C3, series connection
One end of 4th resistance R4 and the 5th resistance R5 is connected to π types filter circuit 22, the other end by the 6th resistance R6 in parallel and
3rd electric capacity C3 is connected to the MULT pin (3 pin) of L6562 chips U1；
Booster circuit 24 includes the 3rd inductance L3, the second diode D2, the first metal-oxide-semiconductor Q1, the 13rd resistance R13 and the 9th
The input of electric capacity C9, the 3rd inductance L3 is connected to π types filter circuit 22, and the input of the second diode D2 is connected to the 3rd electricity
Feel the output end of L3, the output end of the second diode D2 is connected to the 9th electric capacity C9, the input of the first metal-oxide-semiconductor Q1 is connected to the
The output end of three inductance L3, the control end of the first metal-oxide-semiconductor Q1 is connected to the GD pin (7 pin) of L6562 chips U1, the first metal-oxide-semiconductor Q1
Output end be connected to the 13rd resistance R13 of ground connection, and the 13rd resistance R13 is connected to L6562 cores by the 8th electric capacity C8
The CS pin (4 pin) of piece U1, the 9th electric capacity C9 is electrochemical capacitor；
Output sample circuit 25 includes the 14th resistance R14, the 15th resistance R15 and the 16th resistance R16, the of series connection
One end of 14 resistance R14 and the 15th resistance R15 is connected to the output end of the second diode D2, the 14th resistance of series connection
The other end of R14 and the 15th resistance R15 is connected to the INV pin (1 pin) of L6562 chips U1 and the 16th resistance R16 of ground connection；
The VCC pin (8 pin) of L6562 chips U1 are connected to the 3rd diode D3's by the 4th electric capacity C4 and the 5th electric capacity C5
Output end, the 4th electric capacity C4 is electrochemical capacitor.
The operation principle of FPC circuit modules 20 is：The assists winding of the 3rd inductance L3 is used to obtain zero cross signal, when passing through
Voltage reversal on 3rd inductance L3 and when being changed into 0 by the electric current of the 3rd inductance, the GD pin (7 pin) of L6562 chips U1 are defeated
Go out high level, high level turns on the first metal-oxide-semiconductor Q1 by the 11st resistance R11, now, the electric current on the 3rd inductance L3 again can line
Property rise carry out storage energy；
Combined sampling and be input into by the 4th resistance R4 in input sampling circuit 23, the 5th resistance R5, the 6th resistance R6
Magnitude of voltage, sampling is combined by the 14th resistance R14 in output sample circuit 25, the 15th resistance R15, the 16th resistance R16
Output voltage values are obtained, two magnitudes of voltage that sampling is obtained can obtain a reference voltage by L6562 chip U1 internal arithmetics
Value (this reference voltage waveform is the steamed bun ripple similar with input voltage), this reference voltage level is obtained with resistance R13 up-samplings
Magnitude of voltage is compared, when the voltage on the 13rd resistance R13 reaches reference voltage level, GD (7 pin) outputs of L6562 chips U1
Low level, low level drags down the first metal-oxide-semiconductor Q1 grid voltages, the first metal-oxide-semiconductor Q1 meetings by the 9th resistance and the first diode D1
It is turned off, the 9th electric capacity is passed through after the electric energy superposition after the energy and first voltage rectifying and wave-filtering of now the 3rd inductance L3 storages
Circuit below is supplied after C9 filtering, the voltage of C9 electric capacity anodes is the stable DC electricity far above input voltage；
In addition, pfc circuit module 20 is power factor correction circuit, the circuit can improve power factor (PF) of the invention
Value, improves utilization rate of the present invention to power network, while reducing current harmonics, reduces pollution of the whole system to power network.
Fig. 9 is refer to, in the present invention, DC-DC circuit module 30 includes being connected to the output end PFC of pfc circuit module 20
Chip control circuit 31, be connected to the clamp circuit 32 of chip control circuit 31, be connected to the first of chip control circuit 31
Current rectifying and wave filtering circuit, the chip protection circuit 33 for being connected to the first current rectifying and wave filtering circuit, be connected to chip control circuit 31
Two current rectifying and wave filtering circuits 34, the output feedback circuit 35 for being connected to the second current rectifying and wave filtering circuit 34 and it is connected to chip controls
The OB5269 chips U2 of circuit 31, chip protection circuit 33 and output feedback circuit 35；
Chip control circuit 31 includes the second metal-oxide-semiconductor Q2, the 32nd resistance R32 and with primary winding TA, the first pair
The transformer of winding TB and the second auxiliary winding TC, the input of primary winding TA is connected to the output end PFC of pfc circuit module 20,
The output end of primary winding TA is connected to the input of the second metal-oxide-semiconductor Q2, and the control end of the second metal-oxide-semiconductor Q2 is connected to OB5269 chips
The DRV pin (5 pin) of U2, the output end of the second metal-oxide-semiconductor Q2 is connected to the 32nd resistance R32 of ground connection, the 32nd resistance R32
The CS pin (3 pin) of OB5269 chips U2 are connected to by the 13rd electric capacity C13；
Clamp circuit 32 includes the tenth electric capacity C10, the 22nd resistance R22, the 20th three-circuit R23 and the 4th diode
D4, the 22nd resistance R22 and the 23rd resistance R23 connect, and one parallel combination of formation in parallel with the tenth electric capacity C10；The
The input of four diode D4 is connected to the output end of primary winding TA, and the output end of the 4th diode D4 is connected to parallel combination
One end, the input of primary winding TA is connected to the other end of parallel combination；
First current rectifying and wave filtering circuit includes the 6th diode D6 and the 15th electric capacity C15, the input of the 6th diode D6
The positive terminal of the first auxiliary winding TB is connected to, the output end of the 6th diode D6 is connected to the tenth by the 24th resistance R24
The positive pole of five electric capacity C15, the negative pole of the 15th electric capacity C15 is connected to the negative pole end of the first auxiliary winding TB；
Chip protection circuit 33 includes the 4th voltage-regulator diode ZD4, the 26th resistance R26, the 11st electric capacity C11 and the
The input of four triode Q6, the 4th voltage-regulator diode ZD4 is connected to the positive pole of the 15th electric capacity C15, the 4th voltage-regulator diode
The output end of ZD4 is grounded by the 26th resistance R26 for connecting and the 11st electricity C11 appearances, and the 4th voltage-regulator diode ZD4
Output end is connected to the base stage of the 4th triode Q6 by the 26th resistance R26, and the colelctor electrode of the 4th triode Q6 is connected to
The RT pin (1 pin) of OB5269 chips U2, the grounded emitter of the 4th triode Q6；
Second current rectifying and wave filtering circuit 34 includes the 8th diode D8 and the 18th electric capacity C18, the input of the 8th diode D8
End is connected to the positive terminal of the second auxiliary winding TC, and the positive pole of the 18th electric capacity C18 is connected to the output end of the 8th diode D8, the
The negative pole of 18 electric capacity C18 is connected to the negative pole end of the second auxiliary winding TC；
Output feedback circuit 35 includes optocoupler, the 42nd resistance R42, the 43rd resistance R43, controllable accurate source of stable pressure
Q8, the input of the light emitting diode Q7A of optocoupler is connected to the positive terminal of the second auxiliary winding TC, the light emitting diode Q7A of optocoupler
Output end be connected to the negative electrode of controllable accurate source of stable pressure Q8, the colelctor electrode of the phototriode Q7B of optocoupler is connected to OB5269
The FB pin (2 pin) of chip U2, the grounded emitter of the phototriode Q7B of optocoupler；The plus earth of controllable accurate source of stable pressure Q8
And the anode of controllable accurate source of stable pressure Q8 and with reference to being connected to the 43rd resistance R43 between pole, controllable accurate source of stable pressure Q8's
It is electric with reference to being connected to the 42nd between the output end (positive pole of the 18th electric capacity C18D) of pole and the second current rectifying and wave filtering circuit 34
Resistance R42；
The VDD pin (6 pin) of OB5269 chips U2 are connected to the defeated of the 3rd diode D3 by the 3rd current rectifying and wave filtering circuit 36
Go out end；The positive pole of the 15th electric capacity C15 is connected to the input of the first voltage-regulator diode ZD1.
The three or three is provided between the input of the output end of the first current rectifying and wave filtering circuit and the 3rd current rectifying and wave filtering circuit 36
The emitter stage of level pipe Q5, the 3rd triode Q5 is connected to the input of the 5th diode D5, and the base stage of the 3rd triode Q5 passes through
25th resistance R25 is connected to the positive pole of the 15th electric capacity C15, and the colelctor electrode of the 3rd triode Q5 passes through the 24th resistance
R24 is connected to the output end of the 6th diode D6.
Wherein, the 18th electric capacity C18 and the 15th electric capacity C15 is electrochemical capacitor.
DC-DC circuit module 30 is main to be transformed into stabilization by the high-tension direct current of stablizing that pfc circuit module 20 is exported
The low-voltage direct of output.
Operation principle：When circuit normal work, the second metal-oxide-semiconductor Q2 is controlled by OB5269 chips U2, when the second metal-oxide-semiconductor
When Q2 is turned on, PFC voltages arrive ground by transformer primary winding TA, the second metal-oxide-semiconductor Q2, sample resistance (the 32nd resistance R32),
The primary winding TA storage energy of transformer.After OB5269 chips U2 closes the second metal-oxide-semiconductor Q2, primary winding TA releases energy, together
When transformer the second auxiliary winding TC produce induced voltage, this induced voltage is by after the rectifying and wave-filtering of the second current rectifying and wave filtering circuit 34
The direct current output of stabilization is formed, energy is provided to the adjustable optical circuit 70 of constant current；In addition while primary winding TA releases energy, become
First auxiliary winding TB of depressor equally produces induced voltage, and by the first current rectifying and wave filtering circuit, one is to be delivered to the induced voltage
First voltage-regulator diode ZD1 of low-voltage starting circuit 40；Two are, pfc circuit mould is delivered to by the 3rd triode Q5 for turning on
The VCC pin of block 20, are that L6562 chips U1 powers；Three are, the 3rd rectifying and wave-filtering electricity is delivered to by the 3rd triode Q5 for turning on
Road 36, and the VDD pin (6 pin) of OB5269 chips U2 are delivered to by the 3rd current rectifying and wave filtering circuit 36, it is that OB5269 chips U2 is supplied
Electricity.
Specifically, certain cycle of normal work of the present invention, the DRV pin (5 pin) of OB5269 chips U2 export high level to be made
Second metal-oxide-semiconductor Q2 is turned on, the now linear rising of electric current on the primary winding TA of transformer, and electric current rises can cause the 32nd
Voltage on resistance R32 is raised, when the voltage on the 32nd resistance R3 reaches OB5269 chip U2 internal reference voltage values,
DRV pin (5 pin) the output low level of OB5269 chips U2 turns off the second metal-oxide-semiconductor Q2, and now primary winding TA passes through first respectively
Auxiliary winding TB and the second auxiliary winding TC rises to corresponding secondary transmission energy, secondary voltage, output voltage Vo increases.Work as R43*
During Vo/ (R42+R43) ＞ 2.5V, controllable accurate source of stable pressure Q8 conductings, while the light emitting diode Q7A of optocoupler is switched on, conducting
The interior light emitting diodes Q7A of optocoupler lights afterwards, is received by its internal phototriode Q7B, and phototriode Q7B leads
Logical, FB pin (2 pin) voltage of OB5269 chips U2 is reduced and less than the reference of OB5269 chips U2 after phototriode Q7B conductings
Magnitude of voltage, now OB5269 chips U2 DRV pin (5 pin) output high level the second metal-oxide-semiconductor Q2 is turned on.OB5269 chips U2 weights
Multiple above-mentioned action, makes the present invention have the voltage output of stabilization.
In addition, the effect of clamp circuit 32 is to be used to suppress because transformer leakage inductance etc. is produced when the second metal-oxide-semiconductor Q2 is turned off
Raw peak voltage, so as to protect the second metal-oxide-semiconductor Q2；The effect of chip protection circuit 33 is to carry out overvoltage to OB5269 chips U2
Protection, specifically, when output voltage is raised, the voltage on the first auxiliary winding TB can be caused to raise, on the first auxiliary winding TB
The voltage of VCC tie points can be raised after voltage is raised, and the 4th voltage-regulator diode ZD4, the are made when the voltage of VCC tie points is increased to
Four triode Q6 are turned on, and when the 4th triode Q6 is saturated conducting, C, E voltage across poles of the 4th triode Q6 are about 0.1V,
So as to the RT terminal voltages of OB5269 chips U2 be dragged down, OB5269 chips U2 can enter guard mode, be stopped, so as to reach
The function of overvoltage protection.
First auxiliary winding TB of transformer is that pfc circuit module 20 and DC-DC circuit module 30 provide normal work electricity
Pressure, the second auxiliary winding TC of transformer is alternating current sample circuit 50, dim signal output circuit 60 and the adjustable optical circuit of constant current
70 power supplies.
Fig. 8 is refer to, in the present invention, EMI filter circuit 10 includes fuse F1, piezo-resistance VDR, high voltage thin film electricity
Hold CX1, the first inductance L1；
Wherein, fuse F1 is connected to alternating current fire wire L, piezo-resistance VDR and high voltage thin film electric capacity CX1 and is connected in parallel in
Between live wire L and zero line N, the first inductance L1 is connected to the two ends of high voltage thin film electricity CX1.
Wherein, fuse F1 and piezo-resistance VDR composition input protection circuit be ought below circuit break down or
Input voltage can protect other equipment to be unlikely to be damaged when occurring abnormal.The effect of EMI filter circuit 10 is to suppress exchange
The influence of high frequency in power network to equipment；Suppress interference of the equipment to AC network simultaneously.
The flow of powering load of the present invention is：Low-voltage ac voltage after the filtering process of EMI filter circuit 10 by converting
It is first voltage；First voltage becomes DC voltage by the full-bridge rectifier filter in pfc circuit module 20 again, and pfc circuit will
The DC voltage carries out boosting and is converted into second voltage；Second voltage flows into DC-DC circuit module 30 below and through DC-DC electricity
A stabilization, stable tertiary voltage are obtained after the second current rectifying and wave filtering circuit 34 in road module 30；The tertiary voltage is by below
The adjustable optical circuit 70 of constant current after provide constant electric current to the load of power supply institute band.
Wherein, low voltage start circuit 40 is powered for the work of pfc circuit module 20 and DC-DC circuit module 30, due to
The 19th resistance R19 values in low voltage start circuit 40 are smaller, so the present invention can quickly start.In addition, when this hair
After bright normal work, the second triode Q4 shut-offs, start after the second triode Q4 shut-offs does not have on resistance (the 19th resistance R19)
Electric current flows through, the consumption of noenergy.Therefore, low voltage start circuit 40 can reach the effect of quick startup, and volume will not be increased again
Outer power consumption.
Input voltage signal sampling of the invention, signal transacting, dim signal output and the flow for dimming are：Exchange is defeated
Enter the sampled voltage that voltage becomes amplitude very little after alternating current sample circuit 50, the sampled voltage is admitted to dim signal output
Circuit 60, judges the size of AC-input voltage, and the size further according to input voltage exports dim signal to constant current tunable optical
Circuit 70, the output current of constant current the is adjustable whole power supply of optical circuit 70 pairs is controlled, so as to change the luminosity of traffic lights.
Wherein, the two stage treatment of sampled signal is made by dim signal output circuit 60 and constant current adjustable optical circuit 70
Of the invention must export more stable to the electric current of load；Relative to existing for the coagulation of sampled signal, at one-level
Comprehend and arise a problem that, be exactly that such as input voltage is small up and down in dimmer voltage critical value 38V when input voltage is unstable
When scope fluctuates, then export the phenomenon that fluctuation just occurs to the output current of load.And two stage treatment of the invention,
Just be not in above-mentioned phenomenon so that the stability of output circuit is higher.
Implement low-voltage dimming power source of the invention, have the advantages that：First, by the input of low alternating voltage
Set, reduce potential safety hazard during using electricity；Second, by alternating current sample circuit, dim signal output circuit and constant current
The setting of adjustable optical circuit so that the luminosity of traffic lights is adjustable, so as to realize the effect of energy-conserving and low energy consumption, alternating current in addition
Sampled signal causes the stability of the output current of circuit by the treatment of dim signal output circuit and the adjustable optical circuit of constant current
It is higher；3rd, by the setting of low voltage start circuit, shorten the startup time of the invention.
Embodiments of the invention are the foregoing is only, the scope of the claims of the invention is not thereby limited, it is every to utilize this hair
The equivalent structure transformation that bright specification and accompanying drawing content are made, or other related technical fields are directly or indirectly used in,
Similarly it is included within the scope of the present invention.
Claims (9)
1. a kind of low-voltage dimming power source, it is characterised in that including：
EMI filter circuit, for being filtered treatment to low-voltage AC, and exports first voltage；
Pfc circuit module, is connected to the EMI filter circuit；For receiving the first voltage, and output HIGH voltage second
Voltage；
DC-DC circuit module, is connected to the pfc circuit module；For the second voltage to be converted into the 3rd of low-voltage the
Voltage, and powered to the adjustable optical circuit of constant current；
Low voltage start circuit, for the pfc circuit module and DC-DC circuit module for power supply；
Alternating current sample circuit, samples for the carrying out to alternating current；
Dim signal output circuit, is connected to the alternating current sample circuit；For receiving the alternating current sample circuit output
Sampled signal, and export corresponding dim signal；
The adjustable optical circuit of constant current, is connected to the dim signal output circuit and DC-DC circuit module；It is described for receiving
Dim signal, and export corresponding constant current；
The alternating current sample circuit includes the 34th resistance, the 36th resistance, current transformer and LM358 operation amplifiers
Device；
The current transformer electrode input end is connected to alternating current fire wire, the Current Mutual Inductance by the 34th resistance
The cathode output end of device is connected to the dim signal output circuit, and the current transformer by the 36th resistance
Cathode output end be connected to the IN1- pin of the LM358 operational amplifiers, the cathode output end connection of the current transformer
It is connected between the IN1+ pin of the LM358 operational amplifiers, and the IN1- pin and OUT1 pin of the LM358 operational amplifiers
36th resistance, the VCC pin of the LM358 operational amplifiers are connected to the DC-DC by the 5th voltage-regulator diode
The output end of circuit module；
The dim signal output circuit includes L7805 voltage stabilizing chips, PIC16F1823 chips, the first isolating diode, second
Isolating diode, the 49th resistance and the 50th resistance；
The input pin of the L7805 voltage stabilizing chips is connected to the output end of the DC-DC circuit module, the L7805 voltage stabilizings core
The output pin of piece is connected to the VDD pin of the PIC16F1823 chips, and the VSS pin of the PIC16F1823 chips are by described the
50 resistance are connected to the input of second isolating diode, and 8 pin of the PIC16F1823 chips are connected to the friendship
The output end of the electric sample circuit of stream, 9 pin of the PIC16F1823 chips are connected to the constant current by the first isolating diode
The signal receiving end of adjustable optical circuit, 14 pin of the PIC16F1823 chips are by the 49th resistance connected and institute
State the signal receiving end that the second isolating diode is connected to the adjustable optical circuit of the constant current；
The adjustable optical circuit of constant current includes PT4115 chips, the 44th resistance, the 45th resistance and the 4th inductance；
44th resistance and the 45th resistor coupled in parallel form resistance combination, and the resistance combination is connected to described
Between the VIN pin and CSN pin of PT4115 chips, the VIN pin of the PT4115 chips are connected to the defeated of the DC-DC circuit module
Go out end, the DIM pin of the PT4115 chips are connected to the signal output part of the dim signal output circuit, the PT4115 cores
The SW pin of piece are connected between the 4th inductance and the 9th diode, and the output end of the 9th diode is connected to the electricity
The VIN of the resistance combination and the PT4115 chips is combined and the CSN pin of the PT4115 chips between and is connected in resistance
Between pin；
The low voltage start circuit includes the first voltage-regulator diode, the second voltage-regulator diode, the first triode, the second triode
With the 3rd diode；
Wherein, the output end of the pfc circuit module is connected to the input of second voltage-regulator diode by the 18th resistance
End, the output head grounding of second voltage-regulator diode, the output end of the pfc circuit module is connected to by the 19th resistance
The colelctor electrode of second triode, the base stage of second triode is connected to the input of second voltage-regulator diode,
The emitter stage of the second triode is connected to the input of the 3rd diode, and the output end of the 3rd diode is connected to institute
DC-DC circuit module is stated, and the output end of the 3rd diode is connected to the pfc circuit module；
The colelctor electrode of first triode is connected to the base stage of second triode, and the emitter stage of first triode connects
Ground, the base stage of first triode is connected to the output end of first voltage-regulator diode by the 17th resistance, and described the
The input of one voltage-regulator diode is connected to the DC-DC circuit module.
2. a kind of low-voltage dimming power source, it is characterised in that including：
EMI filter circuit, for being filtered treatment to low-voltage AC, and exports first voltage；
Pfc circuit module, is connected to the EMI filter circuit；For receiving the first voltage, and output HIGH voltage second
Voltage；
DC-DC circuit module, is connected to the pfc circuit module；For the second voltage to be converted into the 3rd of low-voltage the
Voltage, and powered to the adjustable optical circuit of constant current；
Low voltage start circuit, for the pfc circuit module and DC-DC circuit module for power supply；
Alternating current sample circuit, samples for the carrying out to alternating current；
Dim signal output circuit, is connected to the alternating current sample circuit；For receiving the alternating current sample circuit output
Sampled signal, and export corresponding dim signal；
The adjustable optical circuit of constant current, is connected to the dim signal output circuit and DC-DC circuit module；It is described for receiving
Dim signal, and export corresponding constant current.
3. low-voltage dimming power source according to claim 2, it is characterised in that the alternating current sample circuit includes the 3rd
14 resistance, the 36th resistance, current transformer and LM358 operational amplifiers；
The current transformer electrode input end is connected to alternating current fire wire, the Current Mutual Inductance by the 34th resistance
The cathode output end of device is connected to the dim signal output circuit, and the current transformer by the 36th resistance
Cathode output end be connected to the IN1- pin of the LM358 operational amplifiers, the cathode output end connection of the current transformer
It is connected between the IN1+ pin of the LM358 operational amplifiers, and the IN1- pin and OUT1 pin of the LM358 operational amplifiers
36th resistance, the VCC pin of the LM358 operational amplifiers are connected to the DC-DC by the 5th voltage-regulator diode
The output end of circuit module.
4. low-voltage dimming power source according to claim 2, it is characterised in that the dim signal output circuit includes
L7805 voltage stabilizing chips, PIC16F1823 chips, the first isolating diode, the second isolating diode, the 49th resistance and the 5th
Ten resistance；
The input pin of the L7805 voltage stabilizing chips is connected to the output end of the DC-DC circuit module, the L7805 voltage stabilizings core
The output pin of piece is connected to the VDD pin of the PIC16F1823 chips, and the VSS pin of the PIC16F1823 chips are by described the
50 resistance are connected to the input of second isolating diode, and 8 pin of the PIC16F1823 chips are connected to the friendship
The output end of the electric sample circuit of stream, 9 pin of the PIC16F1823 chips are connected to the constant current by the first isolating diode
The signal receiving end of adjustable optical circuit, 14 pin of the PIC16F1823 chips are by the 49th resistance connected and institute
State the signal receiving end that the second isolating diode is connected to the adjustable optical circuit of the constant current.
5. low-voltage dimming power source according to claim 2, it is characterised in that the adjustable optical circuit of constant current includes
PT4115 chips, the 44th resistance, the 45th resistance and the 4th inductance；
44th resistance and the 45th resistor coupled in parallel form resistance combination, and the resistance combination is connected to described
Between the VIN pin and CSN pin of PT4115 chips, the VIN pin of the PT4115 chips are connected to the defeated of the DC-DC circuit module
Go out end, the DIM pin of the PT4115 chips are connected to the signal output part of the dim signal output circuit, the PT4115 cores
The SW pin of piece are connected between the 4th inductance and the 9th diode, and the output end of the 9th diode is connected to the electricity
The VIN of the resistance combination and the PT4115 chips is combined and the CSN pin of the PT4115 chips between and is connected in resistance
Between pin.
6. low-voltage dimming power source according to claim 2, it is characterised in that the low voltage start circuit includes first
Voltage-regulator diode, the second voltage-regulator diode, the first triode, the second triode and the 3rd diode；
Wherein, the output end of the pfc circuit module is connected to the input of second voltage-regulator diode by the 18th resistance
End, the output head grounding of second voltage-regulator diode, the output end of the pfc circuit module is connected to by the 19th resistance
The colelctor electrode of second triode, the base stage of second triode is connected to the input of second voltage-regulator diode,
The emitter stage of the second triode is connected to the input of the 3rd diode, and the output end of the 3rd diode is connected to institute
DC-DC circuit module is stated, and the output end of the 3rd diode is connected to the pfc circuit module；
The colelctor electrode of first triode is connected to the base stage of second triode, and the emitter stage of first triode connects
Ground, the base stage of first triode is connected to the output end of first voltage-regulator diode by the 17th resistance, and described the
The input of one voltage-regulator diode is connected to the DC-DC circuit module.
7. low-voltage dimming power source according to claim 6, it is characterised in that the pfc circuit module includes being connected to
The full bridge rectifier of the EMI filter circuit, the π types filter circuit for being connected to the full bridge rectifier, it is connected to the π
The input sampling circuit of type filter circuit, the booster circuit for being connected to the π types filter circuit, it is connected to the booster circuit
Export sample circuit and be connected to the L6562 of the input sampling circuit, the booster circuit and the output sample circuit
Chip；
The input sampling circuit includes the 4th resistance, the 5th resistance, the 6th resistance and the 3rd electric capacity, the 4th electricity of series connection
One end of resistance and the 5th resistance is connected to the π types filter circuit, and the other end is by the 6th resistance in parallel and the 3rd electricity
Appearance is connected to the MULT pin of the L6562 chips；
The booster circuit includes the 3rd inductance, the second diode, the first metal-oxide-semiconductor, the 13rd resistance and the 9th electric capacity, described the
The input of three inductance is connected to the π types filter circuit, and the input of second diode is connected to the 3rd inductance
Output end, the output end of second diode is connected to the 9th electric capacity, and the input of first metal-oxide-semiconductor is connected to
The output end of the 3rd inductance, the control end of first metal-oxide-semiconductor is connected to the GD pin of the L6562 chips, described first
The output end of metal-oxide-semiconductor is connected to the 13rd resistance of ground connection, and the 13rd resistance passes through the 8th capacitance connection in institute
State the CS pin of L6562 chips；
The output sample circuit includes the 14th resistance, the 15th resistance and the 16th resistance, the 14th electricity of series connection
One end of resistance and the 15th resistance is connected to the output end of the second diode, the 14th resistance of series connection and the 15th resistance
The other end be connected to the L6562 chips INV pin and ground connection the 16th resistance；
The VCC pin of the L6562 chips are by the 4th electric capacity and the 5th capacitance connection in the output end of the 3rd diode.
8. low-voltage dimming power source according to claim 6, it is characterised in that the DC-DC circuit module includes connection
Chip control circuit in the pfc circuit module output end, it is connected to the clamp circuit of the chip control circuit, is connected to
First current rectifying and wave filtering circuit of the chip control circuit, the chip protection circuit for being connected to first current rectifying and wave filtering circuit,
The second current rectifying and wave filtering circuit for being connected to the chip control circuit, the output feedback for being connected to second current rectifying and wave filtering circuit
Circuit and it is connected to the OB5269 cores of the chip control circuit, the chip protection circuit and the output feedback circuit
Piece；
The chip control circuit includes the second metal-oxide-semiconductor, the 32nd resistance and with primary winding, the first auxiliary winding and second
The transformer of auxiliary winding, the input of the primary winding is connected to the output end of the pfc circuit module, the primary winding it is defeated
Go out the input that end is connected to second metal-oxide-semiconductor, the control end of second metal-oxide-semiconductor is connected to the OB5269 chips
DRV pin, the output end of second metal-oxide-semiconductor is connected to the 32nd resistance of ground connection, and the 32nd resistance passes through
13rd capacitance connection is in the CS pin of the OB5269 chips；
The clamp circuit includes the tenth electric capacity, the 22nd resistance, the 20th three-circuit and the 4th diode, the described 20th
Two resistance and the 23rd resistant series, and one parallel combination of formation in parallel with the tenth electric capacity；4th diode
Input is connected to the output end of the primary winding, and the output end of the 4th diode is connected to the one of the parallel combination
End, the input of the primary winding is connected to the other end of the parallel combination；
First current rectifying and wave filtering circuit includes the 6th diode and the 15th electric capacity, and the input of the 6th diode is connected
In the positive terminal of the first auxiliary winding, the output end of the 6th diode is connected to the 15th electricity by the 24th resistance
The positive pole of appearance, the negative pole of the 15th electric capacity is connected to the negative pole end of first auxiliary winding；
The chip protection circuit includes the 4th voltage-regulator diode, the 26th resistance, the 11st electric capacity and the 4th triode, institute
The input for stating the 4th voltage-regulator diode is connected to the positive pole of the 15th electric capacity, the output end of the 4th voltage-regulator diode
Institute is passed through by the output end of the 26th resistance and the 11st capacity earth connected, and the 4th voltage-regulator diode
The base stage that the 26th resistance is connected to the 4th triode is stated, the colelctor electrode of the 4th triode is connected to the OB5269 cores
The RT pin of piece, the grounded emitter of the 4th triode；
Second current rectifying and wave filtering circuit includes the 8th diode and the 18th electric capacity, and the input of the 8th diode is connected
In the positive terminal of second auxiliary winding, the positive pole of the 18th electric capacity is connected to the output end of the 8th diode, institute
The negative pole for stating the 18th electric capacity is connected to the negative pole end of second auxiliary winding；
The output feedback circuit includes optocoupler, the 42nd resistance, the 43rd resistance, controllable accurate source of stable pressure, the light
The input of the light emitting diode of coupling is connected to the positive terminal of second auxiliary winding, the output of the light emitting diode of the optocoupler
End is connected to the negative electrode of the controllable accurate source of stable pressure, and the colelctor electrode of the phototriode of the optocoupler is connected to the OB5269
The FB pin of chip, the grounded emitter of the phototriode of the optocoupler；The plus earth of the controllable accurate source of stable pressure and institute
State the anode of controllable accurate source of stable pressure and with reference to being connected to the 43rd resistance between pole, the controllable accurate source of stable pressure
The 42nd resistance is connected between output end with reference to pole and second current rectifying and wave filtering circuit；
The VDD pin of the OB5269 chips are connected to the output end of the 3rd diode by the 3rd current rectifying and wave filtering circuit；Institute
The positive pole for stating the 15th electric capacity is connected to the input of first voltage-regulator diode.
9. low-voltage dimming power source according to claim 8, it is characterised in that the 18th electric capacity and the 15th electric capacity
It is electrochemical capacitor.
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