CN106793346B - Low-voltage dimming power source - Google Patents
Low-voltage dimming power source Download PDFInfo
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- CN106793346B CN106793346B CN201710146238.9A CN201710146238A CN106793346B CN 106793346 B CN106793346 B CN 106793346B CN 201710146238 A CN201710146238 A CN 201710146238A CN 106793346 B CN106793346 B CN 106793346B
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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 sources comprising EMI filter circuit, pfc circuit module, DC-DC circuit module, 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 module is connected to pfc circuit module；Low voltage start circuit is used for pfc circuit module and DC-DC circuit module for power supply；Alternating current sample circuit is used for sampling to alternating current；Dim signal output circuit is connected to alternating current sample circuit；Sampled signal for receiving the output of alternating current sample circuit, and export corresponding dim signal；Constant current is adjustable, and optical circuit is connected to dim signal output circuit and DC-DC circuit module；For receiving dim signal and exporting corresponding constant current.The present invention is arranged by the input of low alternating voltage, reduces the application risk of user；Pass through the setting of constant current adjustable optical circuit and dim signal output circuit so that brightness of the invention is adjustable, saves energy consumption.
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, it is used at present
Traffic lights is high-voltage alternating (85-264V AC) input, and there are certain Electrical Safety hidden danger, simultaneously as existing traffic
Lamp, can not when needing to reduce traffic lights light emission luminance in night or extraneous light weaker environment without brightness control function
Realize, i.e., it is not energy-efficient also not environmentally.
Therefore a kind of input of low-voltage and the adjustable power supply of light emission luminance need to be developed.
Invention content
The present 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 for spending adjustable low energy consumption, solve existing traffic lights high-voltage alternating input there are security risks
And the nonadjustable technical problem of traffic lights light emission luminance.
The technical solution adopted by the present invention to solve the technical problems is：Construct a kind of low-voltage dimming power source comprising：
EMI filter circuit for being filtered 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 converting the second voltage to low-voltage
Tertiary voltage, and give constant current adjustable optical circuit power supply；
Low voltage start circuit, for the pfc circuit module and DC-DC circuit module for power supply；
Alternating current sample circuit, for sampling 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 mutual inductor 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- feet of the LM358 operational amplifiers, the cathode output end of the current transformer
The IN1+ feet of the LM358 operational amplifiers are connected to, and are connected between the IN1- feet and OUT1 feet of the LM358 operational amplifiers
It is connected to the 36th resistance, the VCC feet of the LM358 operational amplifiers are connected to described by the 5th zener 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 feet of the PIC16F1823 chips, and the VSS feet of the PIC16F1823 chips pass through institute
The input terminal that the 50th resistance is connected to second isolating diode is stated, 8 feet of the PIC16F1823 chips are connected to institute
State the output end of alternating current sample circuit, 9 feet 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 feet of the PIC16F1823 chips pass through concatenated 49th resistance
The signal receiving end of the adjustable optical circuit of the constant current is connected to second isolating diode.
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
It states between the VIN feet of PT4115 chips and CSN feet, the VIN feet of the PT4115 chips are connected to the DC-DC circuit module
Output end, the DIM feet of the PT4115 chips are connected to the signal output end of the dim signal output circuit, the PT4115
The SW feet 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 between the CSN feet of the PT4115 chips and is connected to resistance combination and the PT4115 chips
Between VIN feet.
In the present invention, the low voltage start circuit includes the first zener diode, the second zener diode, the one or three
Pole pipe, the second triode and third diode；
Wherein, the output end of the pfc circuit module is connected to second zener diode by the 18th resistance
Input terminal, the output end ground connection of second zener diode, the output end of the pfc circuit module are connected by the 19th resistance
It is connected to the collector of second triode, the base stage of second triode is connected to the input of second zener diode
End, the emitter of the second triode are connected to the input terminal of the third diode, the output end connection of the third diode
It is connected to the pfc circuit module in the output end of the DC-DC circuit module, and the third diode；
The collector 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 zener diode, institute by the 17th resistance
The input terminal for stating the first zener diode is connected to the DC-DC circuit module.
In the present invention, the pfc circuit module includes the full bridge rectifier for being connected to the EMI filter circuit, connects
The π types filter circuit for being connected to the full bridge rectifier, is connected to the input sampling circuit for being connected to the π types filter circuit
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 third capacitance, and concatenated described the
One end of four resistance and the 5th resistance is connected to the π types filter circuit；Concatenated 4th resistance and the 5th resistance it is another
One end is connected to the 6th resistance in parallel and third capacitance, and is connected to the MULT feet of the L6562 chips；
The booster circuit includes third inductance, the second diode, the first metal-oxide-semiconductor, thirteenth resistor and the 9th capacitance, institute
The input terminal for stating third inductance is connected to the π types filter circuit, and the input terminal of second diode is connected to the third
The output end of the output end of inductance, second diode is connected to the 9th capacitance, and the input terminal of first metal-oxide-semiconductor connects
It is connected to the output end of the third inductance, the control terminal of first metal-oxide-semiconductor is connected to the GD feet of the L6562 chips, described
The output end of first metal-oxide-semiconductor is connected to the thirteenth resistor of ground connection, and one end of the thirteenth resistor be connected to it is described
The other end of one end of the first metal-oxide-semiconductor output end and eleventh resistor, the eleventh resistor is connected to the L6562 chips
CS feet, the other end of the thirteenth resistor connect one end of the 8th capacitance, the other end connection of the 8th capacitance described the
The CS feet of the other end of 11 resistance and the L6562 chips；
The output sample circuit include the 14th resistance, the 15th resistance and the 16th resistance, the concatenated described tenth
One end of four resistance and the 15th resistance is connected to the output end of the second diode, concatenated 14th resistance and the 15th
The other end of resistance is connected to the INV feet of the L6562 chips and the 16th resistance of ground connection；
The VCC feet of the L6562 chips connect the output end of the third diode；4th capacitance in parallel and the 5th electricity
One end of appearance is connected to the output end of the third diode, other end ground connection.
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 second auxiliary winding, the input terminal of the primary winding are connected to the output end of the pfc circuit module, the primary winding
Output end be connected to the input terminal of second metal-oxide-semiconductor, the control terminal of second metal-oxide-semiconductor is connected to the OB5269 chips
DRV feet, the output end of second metal-oxide-semiconductor is connected to the 32nd resistance of ground connection, the 32nd resistance
One end is connected to one end of the second metal-oxide-semiconductor output end and the 28th resistance, and the other end of the 28th resistance connects
It is connected to the CS feet of the OB5269 chips, the other end of the 32nd resistance connects one end of the 13rd capacitance, and described the
The other end of 13 capacitances connects the other end of the 28th resistance and the CS feet of the OB5269 chips；
The clamp circuit includes the tenth capacitance, the 22nd resistance, the 23rd resistance and the 4th diode, and described the
22 resistance and the series connection of the 23rd resistance, and one parallel combination of formation in parallel with the tenth capacitance；Four or two pole
The input terminal 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 terminal of the primary winding are connected to the other end of the parallel combination；
First current rectifying and wave filtering circuit includes the 6th diode and the 15th capacitance, the input terminal of the 6th diode
It is connected to the positive terminal of the first auxiliary winding, the output end of the 6th diode is connected to the described tenth by the 24th resistance
The cathode of the anode of five capacitances, the 15th capacitance is connected to the negative pole end of first auxiliary winding；
The chip protection circuit includes the 4th zener diode, the 26th resistance, the 11st capacitance and the four or three pole
Pipe, the input terminal of the 4th zener diode are connected to the anode of the 15th capacitance, the 4th zener diode
Output end is by concatenated 26th resistance and the 11st capacity earth, and the output end of the 4th zener diode
It is connected to the base stage of the 4th triode by the 26th resistance, the collector of the 4th triode is connected to described
The RT feet of OB5269 chips, the emitter ground connection of the 4th triode；
Second current rectifying and wave filtering circuit includes the 8th diode and the 18th capacitance, the input terminal of the 8th diode
It is connected to the positive terminal of second auxiliary winding, the anode of the 18th capacitance is connected to the output of the 8th diode
End, the cathode of the 18th capacitance are 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 terminal 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 cathode of the controllable accurate source of stable pressure, and the collector of the phototriode of the optocoupler is connected to described
The FB feet of OB5269 chips, the emitter ground connection of the phototriode of the optocoupler；The anode of the controllable accurate source of stable pressure connects
It is connected to the 43rd resistance between the anode and reference pole of ground and the controllable accurate source of stable pressure, the controllable accurate is steady
The 42nd resistance is connected between the reference pole of potential source and the output end of second current rectifying and wave filtering circuit；
The VDD feet of the OB5269 chips are connected to the output of the third diode by third current rectifying and wave filtering circuit
End；The anode of 15th capacitance is connected to the input terminal of first zener diode.
In the present invention, the 18th capacitance and the 15th capacitance are electrolytic capacitor.
The low-voltage dimming power source for implementing the present invention, has the advantages that：First, pass through the input of low alternating voltage
Setting, security risk when reducing using electricity；Second, pass through alternating current sample circuit, dim signal output circuit and constant current
The setting of adjustable optical circuit so that the light emission luminance of traffic lights is adjustable, to realize the effect of energy-conserving and low energy consumption, other alternating current
Sampled signal makes the stability of the output current of circuit by the processing of dim signal output circuit and the adjustable optical circuit of constant current
Higher；Third shortens the startup time of the present invention by the setting of low voltage start circuit.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is a kind of circuit flow diagram of the preferred embodiment of low-voltage dimming power source of the present invention；
Fig. 2 is a kind of electrical block diagram of the preferred embodiment of low-voltage dimming power source of the present 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 implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
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 flow diagram of low-voltage dimming power source of the present invention；Fig. 2 is
A kind of electrical block diagram of low-voltage dimming power source of the present 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 of constant current 70.
EMI filter circuit 10 exports first voltage for being filtered to low-voltage AC；Pfc circuit module
20 are connected to EMI filter circuit 10, are used to receive first voltage, and the second voltage of output HIGH voltage；DC-DC circuit module
30 are connected to pfc circuit module 20, are used to convert second voltage to the tertiary voltage of low-voltage, and give the adjustable photoelectricity of constant current
Road 70 powers；Low voltage start circuit 40 is used to power to pfc circuit module 20 and DC-DC circuit module 30；Alternating current samples
Circuit 50 is used for sampling to alternating current；Dim signal output circuit 60 is connected to alternating current sample circuit 50, is used for
The sampled signal of 50 output of alternating current sample circuit is received, and exports corresponding dim signal；Constant current is adjustable, and optical circuit 70 connects
It in dim signal output circuit 60 and DC-DC circuit module 30, is used to receive dim signal, and exports corresponding constant electricity
Stream.
Present invention is mainly used for powering load, which is traffic lights in a preferred embodiment of the invention, 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
Alternating current voltage is pressed, 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 for the hidden danger safe to use for greatly reducing traffic lights.
The flow of powering load of the present invention is：Low-voltage ac voltage converts after EMI filter circuit 10 is filtered
For 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 subsequent DC-DC circuit module 30 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 of constant current 70 after to the load of power supply institute band provide constant electric current.
The input voltage signal sampling of this preferred embodiment, signal processing, dim signal exports and the flow of light modulation is：
AC-input voltage becomes the sampled voltage of amplitude very little after alternating current sample circuit 50, which is admitted to light modulation letter
Number output circuit 60, judges the size of AC-input voltage, and dim signal is exported to constant current further according to the size of input voltage
Adjustable optical circuit 70, constant current is adjustable, and optical circuit 70 controls the output current of entire power supply, to change the hair of traffic lights
Brightness.
Fig. 3 is please referred 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- feet of LM358 operational amplifiers U3, current transformer W1
Cathode output end OUT- be connected to the IN1+ feet of LM358 operational amplifiers U3, and the IN1- feet of LM358 operational amplifiers U3 and
The 36th resistance R36 is connected between OUT1 feet, the VCC feet of LM358 operational amplifiers U3 pass through the 5th zener 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)
Mutual inductor W1, input current size are 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 terminal, size Vin/R34, which passes through the 36th resistance
Be changed into voltage signal after R36, the voltage signal be sampled voltage and from the OUT1 feet of LM358 operational amplifiers U3 export into
Enter the signal input part S of dim signal output circuit 60, voltage swing 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 safety of sampling.In addition, in alternating current sample circuit 50, in addition to LM358 operational amplifiers
Outside U3, other components for being easily affected by temperature are not used, therefore, sample circuit be affected by temperature it is small, meanwhile, it is essence to use
Close current transformer W1 (ZMPT107), ensure that the accuracy of sampling；On the other hand, when the voltage range of sampling output is wanted
Ask bigger, output voltage is needed using LM358 operational amplifiers U3 when being more than the saturation voltage of current transformer W1 to adopting
Sample signal is amplified, and using such circuit sampling precision height, load capacity is strong.
Fig. 4 is please referred 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 feet (1 foot) of PIC16F1823 chips U6, and the VSS feet (2 foot) of PIC16F1823 chips U6 are logical
The input terminal that the 50th resistance R50 is connected to the second isolating diode D11 is crossed, 8 feet of PIC16F1823 chips U6 are connected to friendship
The output end of galvanic electricity sample circuit 50,9 feet of PIC16F1823 chips U6 are connected to constant current by the first isolating diode D10 can
14 feet of signal receiving end DIM, the PIC16F1823 chip U6 of light adjusting circuit 70 pass through concatenated 49th resistance R49 and
Two isolating diode D11 are connected to the signal receiving end DIM of the adjustable optical circuit of constant current 70.
It should be noted that 8 feet of PIC16F1823 chips U6 are the signal input part S of dim signal output circuit 60.
Sampled voltage is sent to 8 feet of PIC16F1823 chips U6, and the sampled voltage size received 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
Stable 5V voltages 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 interfering with each other between preventing dim signal.
Fig. 5 is please referred 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 parallel connections form resistance combination, and resistance combination is connected to
Between the VIN feet and CSN feet of PT4115 chips U4, the VIN feet of PT4115 chips U4 are connected to the output of DC-DC circuit module 30
LED+, the DIM feet of PT4115 chips U4 is held to be connected to the signal output end of dim signal output circuit, the SW of PT4115 chips U4
Foot 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 feet of PT4115 chips U4 and it is connected between resistance combination and the VIN feet of PT4115 chips U4.
It should be noted that the DIM feet of PT4115 chips U4 are the signal receiving end DIM of the adjustable optical circuit of constant current 70, it is permanent
It is load traffic lights power supply to flow adjustable optical circuit 70 to export stable electric current.The output current of this preferred embodiment is by PT4115
The voltage of the DIM feet of chip U4 controls.
Specifically, sampling obtained voltage signal and PIC16F1823 chip U6 inner settings by alternating current sampling circuit 50
Voltage value compare, such as when alternating current input voltage less than 20V AC or higher than 50V AC when, 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-
When 38V AC, 14 feet of PIC16F1823 chips U6 export high level 5V, and 5V voltages pass through the 49th resistance R49, the 50th
Dim signal (Vdim 1.25V) is obtained after resistance R50 partial pressures, constant current at this time is adjustable, and 70 output current of optical circuit is about 300mA,
When alternating current input voltage is in 38-50V AC, (Vdim ≈ 5.0V are big for the 9 feet output dim signal of PIC16F1823 chips U6
In 2.5V), 70 output current of optical circuit that constant current is adjustable is that maximum value is about 600mA.Therefore, as long as dim signal output circuit 60
Different dimmer voltage values is given to DIM feet, so that it may to control the size of the output current value of entire power supply, to realize light modulation
Function.In addition, 60 dimmer voltage of size and dim signal output circuit of adjustable 70 output current value of optical circuit of constant current
Range 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
It is more stable to the electric current of load to obtain output of the invention；Relative to existing for the coagulation of sampled signal, at level-one
Comprehend and arise a problem that, is exactly when input voltage shakiness, for example input voltage is small above or below dimmer voltage critical value 38V
When range fluctuates, then the phenomenon that output just will appear fluctuation to the output current of load.And the two stage treatment of the present invention,
Just be not in above-mentioned phenomenon so that the stability higher of output circuit.
Fig. 6 is please referred to, in the present invention, low voltage start circuit 40 includes the first zener diode ZD1, the second voltage stabilizing two
Pole pipe ZD2, the first triode Q3, the second triode Q4 and third diode D3；
Wherein, the output end PFC of pfc circuit module 20 is connected to the second zener diode ZD2 by the 18th resistance R18
Input terminal, the output end ground connection of the second zener diode ZD2, the output end PFC of pfc circuit module passes through the 19th resistance
R19 is connected to the collector of the second triode Q4, and the base stage of the second triode Q4 is connected to the input of the second zener diode ZD2
End, the emitter of the second triode Q4 are connected to the input terminal of third diode D3, and the output end of third diode D3 is connected to
DC-DC circuit module 20, and the output end of third diode D3 is connected to pfc circuit module 20；
The collector of first triode Q3 is connected to the base stage of the second triode Q4, and the emitter of the first triode Q3 connects
The base stage on ground, the first triode Q3 is connected to the output end of the first zener diode ZD1 by the 17th resistance R17, and first is steady
The input terminal 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 are by the tenth
Eight resistance R18 make the second zener diode ZD2 conductings, and the cathode voltage of the second zener diode ZD2 is the second voltage stabilizing two at this time
The voltage stabilizing value of pole pipe ZD2, this voltage are added in the base stage of the second triode Q4, make the second triode Q4 conductings, the second triode Q4
PFC voltages give pfc circuit mould by start-up resistor (the 19th resistance R19), the second triode Q4, third diode D3 after conducting
The L6562 chips U1 of block 20 and the OB5269 chip power supplies of DC-DC circuit module 30, since the 19th resistance R19 values are smaller,
So the present invention can quickly start.
In addition, after the present invention works normally, the supply voltage of DC-DC circuit module 30 rises so that tie point Vcc,
Tie point PFC Vcc voltages rise, which is used to maintain the normal work of the present invention and pfc circuit module 20, meanwhile, the electricity
The first triode Q3 saturation conductions can be made by the first zener diode ZD1 by pressing, its current collection after the first triode Q3 saturation conductions
Voltage Vce ≈ 0.1V between pole and emitter make the second triode Q4 close to drag down the second triode Q4 base voltages
Disconnected, no electric current flows through in start-up resistor (the 19th resistance R19) after the second triode Q4 shutdowns, the consumption of noenergy.Therefore it is low
Voltage startup circuit 40 can achieve the effect that quickly to start and increase additional power consumption.
Fig. 7 is please referred 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,
It is connected to the booster circuit 24 of π types filter circuit 22, the output sample circuit 25 of booster circuit 24 is connected to and is connected to defeated
Enter sample circuit 23, booster circuit 24 and the L6562 chips U1 for exporting sample circuit 25；
Input sampling circuit 23 includes the 4th resistance R4, the 5th resistance R5, the 6th resistance 56 and third capacitance C3, concatenated
One end of 4th resistance R4 and the 5th resistance R5 is connected to π types filter circuit 22, concatenated 4th resistance R4 and the 5th resistance R5
The other end be connected to the 6th resistance R6 in parallel and third capacitance C3, and be connected to the MULT feet (3 foot) of L6562 chips U1；
Booster circuit 24 includes third inductance L3, the second diode D2, the first metal-oxide-semiconductor Q1, thirteenth resistor R13 and the 9th
The input terminal of capacitance C9, third inductance L3 are connected to π types filter circuit 22, and the input terminal of the second diode D2 is connected to third electricity
Feel the output end of L3, the output end of the second diode D2 is connected to the 9th capacitance C9, and the input terminal of the first metal-oxide-semiconductor Q1 is connected to the
The control terminal of the output end of three inductance L3, the first metal-oxide-semiconductor Q1 is connected to the GD feet (7 foot) of L6562 chips U1, the first metal-oxide-semiconductor Q1
Output end be connected to the thirteenth resistor R13 of ground connection, and one end of thirteenth resistor R13 is connected to the first metal-oxide-semiconductor Q1 outputs
The one end at end and eleventh resistor R11, the other end of eleventh resistor R11 are connected to the CS feet (4 foot) of L6562 chips U1, the
The other end of 13 resistance R13 connects one end of the 8th capacitance C8, the other end connection eleventh resistor R11's of the 8th capacitance C8
The CS feet (4 foot) of the other end and L6562 chips U1, the 9th capacitance C9 is electrolytic capacitor；
It includes the 14th resistance R14, the 15th resistance R15 and the 16th resistance R16 to export sample circuit 25, and concatenated the
One end of 14 resistance R14 and the 15th resistance R15 is connected to the output end of the second diode D2, concatenated 14th resistance
The other end of R14 and the 15th resistance R15 are connected to the 16th resistance R16 of the INV feet (1 foot) and ground connection of L6562 chips U1；
The output end of VCC feet (8 foot) the connection third diode D3 of L6562 chips U1；In parallel the 4th capacitance C4 and the
One end of five capacitance C5 is connected to the output end of third diode D3, and other end ground connection, the 4th capacitance C4 is electrolytic capacitor.
The operation principle of FPC circuit modules 20 is：The auxiliary winding of third inductance L3 is for obtaining zero cross signal, when passing through
Voltage reversal on third inductance L3 and when becoming 0 by the electric current of third inductance, the GD feet (7 foot) of L6562 chips U1 are defeated
Go out high level, the first metal-oxide-semiconductor Q1 is connected by eleventh resistor R11 in high level, at this point, the electric current on third inductance L3 again can line
Property rise carry out storage energy；
Sampling is combined by the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 in input sampling circuit 23 to be inputted
Voltage value combines sampling by the 14th resistance R14, the 15th resistance R15, the 16th resistance R16 in output sample circuit 25
Output voltage values are obtained, two sampled voltage value can obtain a reference voltage by L6562 chip U1 internal arithmetics
Value (this reference voltage waveform is the steamed bun wave similar with input voltage), what this reference voltage level was up-sampled with resistance R13
Voltage value is compared, when the voltage on thirteenth resistor R13 reaches reference voltage level, GD (7 foot) outputs of L6562 chips U1
Low level, low level drag 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, passes through the 9th capacitance after the electric energy superposition after third inductance L3 is stored at this time energy and first voltage rectifying and wave-filtering
Subsequent circuit is supplied after C9 filtering, the voltage of C9 capacitance anodes is electric far above the stable DC of input voltage；
In addition, pfc circuit module 20 is power factor correction circuit, which can improve the power factor (PF) of the present invention
Value improves utilization rate of the present invention to power grid, while reducing current harmonics, reduces pollution of the whole system to power grid.
Fig. 9 is please referred to, in the present invention, DC-DC circuit module 30 includes being connected to 20 output end PFC of pfc circuit module
Chip control circuit 31, be connected to chip control circuit 31 clamp circuit 32, 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
Circuit 31, chip protection circuit 33 and the OB5269 chips U2 for exporting feedback circuit 35；
Chip control circuit 31 is including the second metal-oxide-semiconductor Q2, the 32nd resistance R32 and with primary winding TA, the first pair
The input terminal of the transformer of winding TB and the second auxiliary winding TC, 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 terminal of the second metal-oxide-semiconductor Q2, and the control terminal of the second metal-oxide-semiconductor Q2 is connected to OB5269 chips
The DRV feet (5 foot) of U2, the output end of the second metal-oxide-semiconductor Q2 are connected to the 32nd resistance R32 of ground connection, the 32nd resistance R32
One end be connected to one end of the second metal-oxide-semiconductor Q2 output ends and the 28th resistance R28, the other end of the 28th resistance R28
The CS feet (3 foot) of OB5269 chips U2 are connected to, the other end of the 32nd resistance R32 connects one end of the 13rd capacitance C13,
The other end of 13rd capacitance C13 connects the other end of the 28th resistance R28 and the CS feet (3 foot) of OB5269 chips U2；
Clamp circuit 32 includes the tenth capacitance C10, the 22nd resistance R22, the 23rd resistance R23 and the 4th diode
D4, the 22nd resistance R22 and the 23rd resistance R23 series connection, and one parallel combination of formation in parallel with the tenth capacitance C10；The
The input terminal 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
The input terminal of one end, 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 capacitance C15, the input terminal of the 6th diode D6
It is connected to the positive terminal of the first auxiliary winding TB, the output end of the 6th diode D6 is connected to the tenth by the 24th resistance R24
The anode of five capacitance C15, the cathode of the 15th capacitance C15 are connected to the negative pole end of the first auxiliary winding TB；
Chip protection circuit 33 includes the 4th zener diode ZD4, the 26th resistance R26, the 11st capacitance C11 and the
The input terminal of four triode Q6, the 4th zener diode ZD4 is connected to the anode of the 15th capacitance C15, the 4th zener diode
The output end of ZD4 is held by concatenated 26th resistance R26 and the 11st electricity C11 to be grounded, and the 4th zener diode ZD4
Output end is connected to the base stage of the 4th triode Q6 by the 26th resistance R26, and the collector of the 4th triode Q6 is connected to
The RT feet (1 foot) of OB5269 chips U2, the emitter ground connection of the 4th triode Q6；
Second current rectifying and wave filtering circuit 34 includes the 8th diode D8 and the 18th capacitance C18, the input of the 8th diode D8
End is connected to the positive terminal of the second auxiliary winding TC, and the anode of the 18th capacitance C18 is connected to the output end of the 8th diode D8, the
The cathode of 18 capacitance C18 is connected to the negative pole end of the second auxiliary winding TC；
It includes optocoupler, the 42nd resistance R42, the 43rd resistance R43, controllable accurate source of stable pressure to export feedback circuit 35
Q8, the input terminal of the light emitting diode Q7A of optocoupler are connected to the positive terminal of the second auxiliary winding TC, the light emitting diode Q7A of optocoupler
Output end be connected to the cathode of controllable accurate source of stable pressure Q8, the collector of the phototriode Q7B of optocoupler is connected to OB5269
The FB feet (2 foot) of chip U2, the emitter ground connection of the phototriode Q7B of optocoupler；The plus earth of controllable accurate source of stable pressure Q8
And it is connected to the 43rd resistance R43 between the anode and reference pole of controllable accurate source of stable pressure Q8, controllable accurate source of stable pressure Q8's
It is electric with reference to being connected to the 42nd between pole and the output end (anode of the 18th capacitance C18D) of the second current rectifying and wave filtering circuit 34
Hinder R42；
The VDD feet (6 foot) of OB5269 chips U2 are connected to the defeated of third diode D3 by third current rectifying and wave filtering circuit 36
Outlet；The anode of 15th capacitance C15 is connected to the input terminal of the first zener diode ZD1.
It is provided with the three or three between the output end and the input terminal of third current rectifying and wave filtering circuit 36 of first current rectifying and wave filtering circuit
Pole pipe Q5, the emitter of third transistor Q5 are connected to the input terminal of the 5th diode D5, and the base stage of third transistor Q5 passes through
25th resistance R25 is connected to the anode of the 15th capacitance C15, and the collector of third transistor Q5 passes through the 24th resistance
R24 is connected to the output end of the 6th diode D6.
Wherein, the 18th capacitance C18 and the 15th capacitance C15 is electrolytic capacitor.
The direct current for the stabilization high voltage that pfc circuit module 20 exports mainly is transformed into stabilization by DC-DC circuit module 30
The low-voltage direct of output.
Operation principle：When circuit works normally, the second metal-oxide-semiconductor Q2 is controlled by OB5269 chips U2, when the second metal-oxide-semiconductor
When Q2 is connected, 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 of transformer stores energy.After OB5269 chips U2 closes the second metal-oxide-semiconductor Q2, primary winding TA releases energy, together
When transformer the second auxiliary winding TC generate induced voltage, after this induced voltage is by 34 rectifying and wave-filtering of the second current rectifying and wave filtering circuit
Stable direct current output 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 generates induced voltage, and the induced voltage is by the first current rectifying and wave filtering circuit, first, being delivered to
First zener diode ZD1 of low-voltage starting circuit 40；Second is that the third transistor Q5 by conducting is delivered to pfc circuit mould
The VCC feet of block 20 are the U1 power supplies of L6562 chips；Third, being delivered to third rectifying and wave-filtering electricity by the third transistor Q5 of conducting
Road 36, and pass through the VDD feet (6 foot) that third current rectifying and wave filtering circuit 36 is delivered to OB5269 chips U2, it is that OB5269 chips U2 is supplied
Electricity.
Specifically, some period that the present invention works normally, DRV feet (5 foot) the output high level of OB5269 chips U2 makes
Second metal-oxide-semiconductor Q2 conductings, the at this time linear rising of electric current on the primary winding TA of transformer, electric current rising can lead to the 32nd
Voltage on resistance R32 increases, when the voltage on the 32nd resistance R3 reaches OB5269 chip U2 internal reference voltage values,
DRV feet (5 foot) the output low level of OB5269 chips U2 is by the second metal-oxide-semiconductor Q2 shutdowns, and primary winding TA passes through first respectively at this time
Auxiliary winding TB and the second auxiliary winding TC transmits energy to corresponding secondary side, and secondary voltage rises, and output voltage Vo increases.Work as R43*
When Vo/ (R42+R43) > 2.5V, the Q8 conductings of controllable accurate source of stable pressure, while the light emitting diode Q7A of optocoupler is switched on, conducting
The interior light emitting diodes Q7A of optocoupler shines afterwards, is received by its internal phototriode Q7B, phototriode Q7B is led
Logical, FB feet (2 foot) voltage of OB5269 chips U2 reduces and is less than the reference of OB5269 chips U2 after phototriode Q7B conductings
Voltage value, DRV feet (5 foot) the output high level of OB5269 chips U2 is by the second metal-oxide-semiconductor Q2 conducting at this time.OB5269 chips U2 weights
Multiple above-mentioned action, makes the present invention have stable voltage output.
In addition, the effect of clamp circuit 32 is to be used to inhibit due to productions such as transformer leakage inductances when the second metal-oxide-semiconductor Q2 shutdowns
Raw peak voltage, to the second metal-oxide-semiconductor Q2 of protection；The effect of chip protection circuit 33 is to carry out overvoltage to OB5269 chips U2
Protection, specifically, when output voltage increases, the voltage on the first auxiliary winding TB can be caused to increase, on the first auxiliary winding TB
The voltage of VCC tie points can increase after voltage increases, and make the 4th zener diode ZD4, the when the voltage of VCC tie points is increased to
Four triode Q6 conductings, when the 4th triode Q6 is saturated conducting, C, E voltage across poles of the 4th triode Q6 is about 0.1V,
To drag down the RT terminal voltages of OB5269 chips U2, OB5269 chips U2 can enter guard mode, be stopped, 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
Second auxiliary winding TC of pressure, 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 please referred to, in the present invention, EMI filter circuit 10 includes fuse F1, varistor VDR, high voltage thin film electricity
Hold CX1, the first inductance L1；
Wherein, fuse F1 is connected to alternating current fire wire L, varistor VDR and high voltage thin film capacitance CX1 and is connected in parallel in
Between firewire L and zero curve N, the first inductance L1 is connected to the both ends of high voltage thin film electricity CX1.
Wherein, the input protection circuit of fuse F1 and varistor VDR compositions 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 inhibit exchange
Influence of the high frequency to equipment in power grid；Inhibit interference of the equipment to AC network simultaneously.
The flow of powering load of the present invention is：Low-voltage ac voltage converts after EMI filter circuit 10 is filtered
For 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 subsequent DC-DC circuit module 30 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 of constant current 70 after to the load of power supply institute band provide constant electric current.
Wherein, low voltage start circuit 40 is the work power supply 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, working as this hair
After bright normal work, the second triode Q4 shutdowns do not have after the second triode Q4 shutdowns in start-up resistor (the 19th resistance R19)
Electric current flows through, the consumption of noenergy.Therefore low voltage start circuit 40 can achieve the effect that quickly to start and increase volume
Outer power consumption.
The input voltage signal sampling of the present invention, signal processing, dim signal exports and the flow of light modulation is：It exchanges defeated
Enter the sampled voltage that voltage becomes amplitude very little after alternating current sample circuit 50, which is admitted to dim signal output
Circuit 60 judges the size of AC-input voltage, and dim signal is exported to constant current tunable optical further according to the size of input voltage
Circuit 70, constant current is adjustable, and optical circuit 70 controls the output current of entire power supply, to change the light emission luminance 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
It is more stable to the electric current of load to obtain output of the invention；Relative to existing for the coagulation of sampled signal, at level-one
Comprehend and arise a problem that, is exactly when input voltage shakiness, for example input voltage is small above or below dimmer voltage critical value 38V
When range fluctuates, then the phenomenon that output just will appear fluctuation to the output current of load.And the two stage treatment of the present invention,
Just be not in above-mentioned phenomenon so that the stability higher of output circuit.
The low-voltage dimming power source for implementing the present invention, has the advantages that：First, pass through the input of low alternating voltage
Setting, security risk when reducing using electricity；Second, pass through alternating current sample circuit, dim signal output circuit and constant current
The setting of adjustable optical circuit so that the light emission luminance of traffic lights is adjustable, to realize the effect of energy-conserving and low energy consumption, other alternating current
Sampled signal makes the stability of the output current of circuit by the processing of dim signal output circuit and the adjustable optical circuit of constant current
Higher；Third shortens the startup time of the present invention by the setting of low voltage start circuit.
Example the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this hair
Equivalent structure transformation made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant technical fields,
Similarly it is included within the scope of the present invention.
Claims (8)
1. a kind of low-voltage dimming power source, which is characterized in that including：
EMI filter circuit for being filtered to low-voltage AC, and exports first voltage；
Pfc circuit module is connected to the EMI filter circuit；For receiving the first voltage, and the second of output HIGH voltage
Voltage；
DC-DC circuit module is connected to the pfc circuit module；Third for converting the second voltage to low-voltage
Voltage, and give constant current adjustable optical circuit power supply；
Low voltage start circuit, for the pfc circuit module and DC-DC circuit module for power supply；
Alternating current sample circuit, for sampling 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- feet of the LM358 operational amplifiers, the cathode output end connection of the current transformer
In the IN1+ feet of the LM358 operational amplifiers, and it is connected between the IN1- feet and OUT1 feet of the LM358 operational amplifiers
The VCC feet of 36th resistance, the LM358 operational amplifiers are connected to the DC-DC by the 5th zener 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 feet of the PIC16F1823 chips, and the VSS feet of the PIC16F1823 chips pass through described
50 resistance are connected to the input terminal of second isolating diode, and 8 feet of the PIC16F1823 chips are connected to the friendship
9 feet of the output end of galvanic electricity sample circuit, the PIC16F1823 chips are connected to the constant current by the first isolating diode
14 feet of the signal receiving end of adjustable optical circuit, the PIC16F1823 chips pass through concatenated 49th resistance 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 feet and CSN feet of PT4115 chips, the VIN feet of the PT4115 chips are connected to the defeated of the DC-DC circuit module
Outlet, the DIM feet of the PT4115 chips are connected to the signal output end of the dim signal output circuit, the PT4115 cores
The SW feet 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 between the CSN feet of the PT4115 chips and is connected in resistance
Between foot；
The low voltage start circuit includes the first zener diode, the second zener diode, the first triode, the second triode
With third diode；
Wherein, the output end of the pfc circuit module is connected to the input of second zener diode by the 18th resistance
End, the output end ground connection of second zener diode, the output end of the pfc circuit module are connected to by the 19th resistance
The collector of second triode, the base stage of second triode are connected to the input terminal of second zener diode,
The emitter of second triode is connected to the input terminal of the third diode, and the output end of the third diode is connected to institute
DC-DC circuit module is stated, and the output end of the third diode is connected to the pfc circuit module；
The collector of first triode is connected to the base stage of second triode, and the emitter of first triode connects
Ground, the base stage of first triode are connected to the output end of first zener diode by the 17th resistance, and described
The input terminal of one zener diode is connected to the DC-DC circuit module.
2. a kind of low-voltage dimming power source, which is characterized in that including：
EMI filter circuit for being filtered to low-voltage AC, and exports first voltage；
Pfc circuit module is connected to the EMI filter circuit；For receiving the first voltage, and the second of output HIGH voltage
Voltage；
DC-DC circuit module is connected to the pfc circuit module；Third for converting the second voltage to low-voltage
Voltage, and give constant current adjustable optical circuit power supply；
Low voltage start circuit, for the pfc circuit module and DC-DC circuit module for power supply；
Alternating current sample circuit, for sampling 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 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 feet of the PIC16F1823 chips, and the VSS feet of the PIC16F1823 chips pass through described
50 resistance are connected to the input terminal of second isolating diode, and 8 feet of the PIC16F1823 chips are connected to the friendship
9 feet of the output end of galvanic electricity sample circuit, the PIC16F1823 chips are connected to the constant current by the first isolating diode
14 feet of the signal receiving end of adjustable optical circuit, the PIC16F1823 chips pass through concatenated 49th resistance and institute
State the signal receiving end that the second isolating diode is connected to the adjustable optical circuit of the constant current.
3. low-voltage dimming power source according to claim 2, which is characterized in that the alternating current sample circuit includes third
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- feet of the LM358 operational amplifiers, the cathode output end connection of the current transformer
In the IN1+ feet of the LM358 operational amplifiers, and it is connected between the IN1- feet and OUT1 feet of the LM358 operational amplifiers
The VCC feet of 36th resistance, the LM358 operational amplifiers are connected to the DC-DC by the 5th zener diode
The output end of circuit module.
4. low-voltage dimming power source according to claim 2, which is characterized 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 feet and CSN feet of PT4115 chips, the VIN feet of the PT4115 chips are connected to the defeated of the DC-DC circuit module
Outlet, the DIM feet of the PT4115 chips are connected to the signal output end of the dim signal output circuit, the PT4115 cores
The SW feet 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 between the CSN feet of the PT4115 chips and is connected in resistance
Between foot.
5. low-voltage dimming power source according to claim 2, which is characterized in that the low voltage start circuit includes first
Zener diode, the second zener diode, the first triode, the second triode and third diode；
Wherein, the output end of the pfc circuit module is connected to the input of second zener diode by the 18th resistance
End, the output end ground connection of second zener diode, the output end of the pfc circuit module are connected to by the 19th resistance
The collector of second triode, the base stage of second triode are connected to the input terminal of second zener diode,
The emitter of second triode is connected to the input terminal of the third diode, and the output end of the third diode is connected to institute
DC-DC circuit module is stated, and the output end of the third diode is connected to the pfc circuit module；
The collector of first triode is connected to the base stage of second triode, and the emitter of first triode connects
Ground, the base stage of first triode are connected to the output end of first zener diode by the 17th resistance, and described
The input terminal of one zener diode is connected to the DC-DC circuit module.
6. low-voltage dimming power source according to claim 5, which is characterized in that the pfc circuit module includes being connected to
The full bridge rectifier of the EMI filter circuit, is connected to the π at the π types filter circuit for being connected to the full bridge rectifier
The input sampling circuit of type filter circuit, is connected to the booster circuit at the booster circuit for being connected to the π types filter circuit
Output sample circuit and the L6562 for being connected to 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 third capacitance, concatenated 4th electricity
One end of resistance and the 5th resistance is connected to the π types filter circuit；The other end of concatenated 4th resistance and the 5th resistance
It is connected to the 6th resistance in parallel and third capacitance, and is connected to the MULT feet of the L6562 chips；
The booster circuit includes third inductance, the second diode, the first metal-oxide-semiconductor, thirteenth resistor and the 9th capacitance, and described
The input terminal of three inductance is connected to the π types filter circuit, and the input terminal of second diode is connected to the third inductance
Output end, the output end of second diode is connected to the 9th capacitance, and the input terminal of first metal-oxide-semiconductor is connected to
The output end of the third inductance, the control terminal of first metal-oxide-semiconductor are connected to the GD feet of the L6562 chips, and described first
The output end of metal-oxide-semiconductor is connected to the thirteenth resistor of ground connection, and one end of the thirteenth resistor is connected to described first
One end of metal-oxide-semiconductor output end and eleventh resistor, the other end of the eleventh resistor are connected to the CS of the L6562 chips
Foot, the other end of the thirteenth resistor connect one end of the 8th capacitance, the other end connection the described tenth of the 8th capacitance
The CS feet of the other end of one resistance and the L6562 chips；The output sample circuit includes the 14th resistance, the tenth
One end of five resistance and the 16th resistance, concatenated 14th resistance and the 15th resistance is connected to the defeated of the second diode
The other end of outlet, concatenated 14th resistance and the 15th resistance is connected to INV feet and the ground connection of the L6562 chips
The 16th resistance；
The VCC feet of the L6562 chips connect the output end of the third diode；4th capacitance and the 5th capacitance in parallel
One end is connected to the output end of the third diode, other end ground connection.
7. low-voltage dimming power source according to claim 5, which is characterized in that the DC-DC circuit module includes connection
In the pfc circuit module output end chip control circuit, be connected to the chip control circuit clamp circuit, be 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 output feedback for being connected to the second current rectifying and wave filtering circuit of the chip control circuit, being connected to second current rectifying and wave filtering circuit
Circuit and the OB5269 cores for being connected to the chip control circuit, the chip protection circuit and the output feedback circuit
Piece；
The chip control circuit is including 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 terminal of the primary winding are connected to the output end of the pfc circuit module, the primary winding it is defeated
Outlet is connected to the input terminal of second metal-oxide-semiconductor, and the control terminal of second metal-oxide-semiconductor is connected to the OB5269 chips
DRV feet, the output end of second metal-oxide-semiconductor are connected to the 32nd resistance of ground connection, and the one of the 32nd resistance
End is connected to one end of the second metal-oxide-semiconductor output end and the 28th resistance, the other end connection of the 28th resistance
In the CS feet of the OB5269 chips, the other end of the 32nd resistance connects one end of the 13rd capacitance, and the described tenth
The other end of three capacitances connects the other end of the 28th resistance and the CS feet of the OB5269 chips；
The clamp circuit include the tenth capacitance, the 22nd resistance, the 23rd resistance and the 4th diode, the described 20th
Two resistance and the series connection of the 23rd resistance, and one parallel combination of formation in parallel with the tenth capacitance；4th diode
Input terminal 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 terminal of the primary winding are connected to the other end of the parallel combination；
First current rectifying and wave filtering circuit includes the 6th diode and the 15th capacitance, and the input terminal of the 6th diode connects
The 15th electricity is connected to by the 24th resistance in the output end of the positive terminal of the first auxiliary winding, the 6th diode
The cathode of the anode of appearance, the 15th capacitance is connected to the negative pole end of first auxiliary winding；
The chip protection circuit includes the 4th zener diode, the 26th resistance, the 11st capacitance and the 4th triode, institute
The input terminal for stating the 4th zener diode is connected to the anode of the 15th capacitance, the output end of the 4th zener diode
By concatenated 26th resistance and the 11st capacity earth, and the output end of the 4th zener diode passes through institute
The base stage that the 26th resistance is connected to the 4th triode is stated, the collector of the 4th triode is connected to the OB5269 cores
The RT feet of piece, the emitter ground connection of the 4th triode；
Second current rectifying and wave filtering circuit includes the 8th diode and the 18th capacitance, and the input terminal of the 8th diode connects
It is connected to the output end of the 8th diode, institute in the anode of the positive terminal of second auxiliary winding, the 18th capacitance
The cathode for stating the 18th capacitance 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 terminal 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 cathode of the controllable accurate source of stable pressure, and the collector of the phototriode of the optocoupler is connected to the OB5269
The FB feet of chip, the emitter ground connection of the phototriode of the optocoupler；The plus earth of the controllable accurate source of stable pressure and institute
It states and is connected to the 43rd resistance between the anode of controllable accurate source of stable pressure and reference pole, the controllable accurate source of stable pressure
With reference to being connected to the 42nd resistance between pole and the output end of second current rectifying and wave filtering circuit；
The VDD feet of the OB5269 chips are connected to the output end of the third diode by third current rectifying and wave filtering circuit；Institute
The anode for stating the 15th capacitance is connected to the input terminal of first zener diode.
8. low-voltage dimming power source according to claim 7, which is characterized in that the 18th capacitance and the 15th capacitance
For electrolytic capacitor.
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| CN201710146238.9A CN106793346B (en) | 2017-03-13 | 2017-03-13 | Low-voltage dimming power source |
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| CN106793346B true CN106793346B (en) | 2018-10-30 |
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| CN110519879B (en) * | 2018-05-21 | 2024-06-04 | 深圳市朗科智能电气股份有限公司 | LED driving power supply based on 2.4G remote control dimming and toning |
| CN110418072B (en) * | 2019-08-29 | 2021-01-01 | 苏州中科全象智能科技有限公司 | Industrial camera light supplement control method and system |
| CN113783413A (en) * | 2021-09-03 | 2021-12-10 | 株洲市众普森技术有限公司 | Method for changing PFC output voltage |
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