CN206585802U - Low-voltage dimming power source - Google Patents
Low-voltage dimming power source Download PDFInfo
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- CN206585802U CN206585802U CN201720241475.9U CN201720241475U CN206585802U CN 206585802 U CN206585802 U CN 206585802U CN 201720241475 U CN201720241475 U CN 201720241475U CN 206585802 U CN206585802 U CN 206585802U
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Abstract
The utility model is related to a kind of low-voltage dimming power source, and 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 power to pfc circuit module and DC DC circuit modules；Alternating current sample circuit is used for sampling to 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 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 constant current.The utility model is set by the input of low alternating voltage, reduces the application risk of user；Pass through the setting of the adjustable optical circuit of constant current and dim signal output circuit so that brightness of the present utility model is adjustable, save energy consumption.
Description
Technical field
The utility model is related 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, there is certain Electrical Safety hidden danger, meanwhile, when input voltage is too high
When, traffic lights can be damaged, and because existing traffic lights is without brightness control function, when weaker at night or extraneous light
Need not realizing during reduction traffic lights luminosity in environment, i.e., do not save also not environmentally.
Therefore a kind of low-voltage input and the adjustable power supply of luminosity need to be developed.
Utility model content
The utility model provide it is a kind of inputted for low alternating current, reduce Electrical Safety hidden danger and traffic lights send out
The low-voltage dimming power source of the adjustable low energy consumption of brightness, the high-voltage alternating input for solving existing traffic lights is hidden in the presence of safety
The suffer from and nonadjustable technical problem of traffic lights luminosity.
The utility model solves the technical scheme that its technical problem used：A kind of low-voltage dimming power source is constructed, its
Including：
EMI filter circuit, for being filtered processing 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, 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；
The EMI filter circuit includes fuse, piezo-resistance, high voltage thin film electric capacity, the first inductance；Wherein, it is described to protect
Dangerous silk is connected to the output end of alternating current fire wire, and the piezo-resistance and the high voltage thin film electric capacity are connected in parallel in live wire and zero
Between line, first inductance connection is in the two ends of high voltage thin film electricity.
In the utility model, the DC-DC circuit module includes being connected to the chip of the pfc circuit module output end
Control circuit, the first rectification filter for being connected to the clamp circuit of the chip control circuit, being connected to the chip control circuit
Wave circuit, the chip protection circuit for being connected to first current rectifying and wave filtering circuit, it is connected to the second of the chip control circuit
Current rectifying and wave filtering circuit, the output feedback circuit for being connected to second current rectifying and wave filtering circuit and it is connected to the chip controls
The OB5269 chips of circuit, 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 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 is by the 26th resistance of series connection and the 11st capacity earth, and the output end of the 4th voltage-regulator diode
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
The 43rd resistance is connected 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 output end of the reference pole of potential source and second current rectifying and wave filtering circuit.
In the utility model, the RT pin of the OB5269 chips pass through the 27th resistance eutral grounding, the OB5269 cores
The GND pin ground connection of piece, 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 15th electric capacity is connected to the input of the first voltage-regulator diode.
In the utility model, it is mutual that the alternating current sample circuit includes the 34th resistance, the 36th resistance, electric current
Sensor and 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 utility model, the dim signal output circuit include 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, the 49th resistance that 14 pin of the PIC16F1823 chips pass through series connection
The signal receiving end of the adjustable optical circuit of the constant current is connected to second isolating diode.
In the utility model, 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 the resistor coupled in parallel formation, one resistance combination, 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 between the CSN pin of the PT4115 chips and is connected to resistance combination and the PT4115 chips
Between VIN pin.
In the utility model, the low voltage start circuit includes first voltage-regulator diode, the pole of the second voltage stabilizing two
Pipe, the first triode, 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 utility model, the pfc circuit module includes being connected to the full-bridge rectification electricity of the EMI filter circuit
Road, the π types filter circuit for being connected to the full bridge rectifier, the input sampling circuit for being connected to the π types filter circuit, company
The booster circuit that is connected to the π types filter circuit, the output sample circuit for being connected to the booster circuit and it is connected to described
The L6562 chips of input sampling 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 passes through 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 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.
Implement low-voltage dimming power source of the present utility model, have the advantages that：First, pass through low alternating voltage
Input is set, and is reduced using potential safety hazard during electricity；Second, by alternating current sample circuit, dim signal output circuit and
The setting of constant current is 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, hands in addition
The electric sampled signal of stream causes the steady of the output current of circuit by the processing of dim signal output circuit and the adjustable optical circuit of constant current
It is qualitative higher；3rd, by the setting of low voltage start circuit, shorten the startup time of the present utility model；4th, pass through
The setting of EMI filter circuit, protect safety of the present utility model, it is to avoid subsequent conditioning circuit is damaged.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is described in further detail, 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 present utility model；
Fig. 2 is a kind of electrical block diagram of the preferred embodiment of low-voltage dimming power source of the present utility model；
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.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain
The utility model, is not used to limit the utility model.
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 present utility model；Figure
2 be a kind of electrical block diagram of low-voltage dimming power source of the present utility model；A kind of low-voltage dimming power source 100 includes
EMI filter circuit 10, pfc circuit module 20, DC-DC circuit module 30, low voltage start circuit 40, alternating current sample circuit
50th, 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 processing, and exports first voltage；Pfc circuit module
20 are connected to EMI filter circuit 10, and it is 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, and it is used for the tertiary voltage that second voltage is converted into low-voltage, and to 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 is sampled
Circuit 50 is used for sampling to 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.
The utility model is mainly used in powering load, and it is traffic that this, which is supported in preferred embodiment of the present utility model,
Lamp, and the input voltage of this preferred embodiment is relatively low compared to the input voltage of existing traffic lights, this preferred embodiment it is defeated
Enter voltage for low-voltage alternating-current piezoelectric voltage, be 20V-50V optionally, and the input voltage of existing traffic lights is 85V-264V
AC.It is therefore apparent that, the utility model plays the effect for the use potential safety hazard for greatly reducing traffic lights.
The flow of the utility model powering load is：Low-voltage ac voltage is after the filtering process of EMI filter circuit 10
It is converted into first voltage；First voltage becomes DC voltage, PFC electricity by the full-bridge rectifier filter in pfc circuit module 20 again
DC voltage progress boosting is converted into second voltage by road；Second voltage flows into DC-DC circuit module 30 below and through DC-
A stabilization, stable tertiary voltage are obtained after the second current rectifying and wave filtering circuit 34 in DC circuit modules 30；The tertiary voltage passes through
Load after the adjustable optical circuit 70 of constant current below to power supply institute band provides constant electric current.
The input voltage signal sampling of this preferred embodiment, signal transacting, the flow of dim signal output and light modulation are：
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 70 pairs of optical circuit is controlled, so as to change the hair of traffic lights
Brightness.
Fig. 3 is refer to, in the utility model, 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
Sensor W1 cathode output end OUT+ is connected to the signal input part of dim signal output circuit 60 by the 36th resistance R36
S, and current transformer W1 cathode output end OUT+ is connected to LM358 operational amplifiers U3 IN1- pin, current transformer W1
Cathode output end OUT- be connected to LM358 operational amplifiers U3 IN1+ pin, and LM358 operational amplifiers U3 IN1- pin and
The 36th resistance R36 is connected between OUT1 pin, LM358 operational amplifiers U3 VCC pin 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
Device W1 output end 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, current transformer W1 model ZMPT107, in alternating current sample circuit 50, due to current transformer
W1 high_voltage isolation, improves the security of sampling.In addition, in alternating current sample circuit 50, except 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, use for 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 current transformer W1 saturation voltage
Sample signal is amplified, high using such a circuit sampling precision, and load capacity is strong.
Refer to Fig. 4, in the utility model, dim signal output circuit 60 include L7805 voltage stabilizing chips U5,
PIC16F1823 chips U6, the first isolating diode D10, the second isolating diode D11, the 49th resistance R49 and the 50th
Resistance R50；
L7805 voltage stabilizing chips U5 input pin is connected to output end LED+, L7805 the voltage stabilizing core of DC-DC circuit module 30
Piece U5 output pin is connected to PIC16F1823 chips U6 VDD pin (1 pin), and PIC16F1823 chips U6 VSS pin (2 pin) lead to
The input that the 50th resistance R50 is connected to the second isolating diode D11 is crossed, PIC16F1823 chips U6 8 pin are connected to friendship
The output end of the electric sample circuit 50 of stream, PIC16F1823 chips U6 9 pin are connected to constant current by the first isolating diode D10 can
Signal receiving end DIM, the PIC16F1823 chip U6 of light adjusting circuit 70 14 pin pass through the 49th resistance R49 of series connection and
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 PIC16F1823 chips U6 8 pin are the signal input part S of dim signal output circuit 60.
Sampled voltage is sent to PIC16F1823 chips U6 8 pin, and the sampled voltage size received is passed through
The numerical value of PIC16F1823 chips U6 inner setting is compared to determine the output of dim signal；L7805 voltage stabilizing chips U5
Stable 5V voltages are provided for PIC16F1823 chips U6 normal work；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 utility model, constant current is adjustable, and optical circuit 70 includes PT4115 chips U4, the 44th electricity
Hinder 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 PT4115 chips U4 VIN pin and CSN pin, PT4115 chips U4 VIN pin are connected to the output of DC-DC circuit module 30
LED+ is held, PT4115 chips U4 DIM pin are connected to the signal output part of dim signal output circuit, PT4115 chips U4 SW
Pin is connected between the 4th inductance L4 and the 9th diode D9, the 9th diode D9 output end be connected to resistance combination and
Between PT4115 chips U4 CSN pin and be connected to resistance combination PT4115 chips U4 VIN pin between.
It should be noted that PT4115 chips U4 DIM pin are the signal receiving end DIM of the adjustable optical circuit 70 of constant current, it is permanent
The stable electric current of the adjustable output of optical circuit 70 is flowed to power for load traffic lights.The output current of this preferred embodiment is by PT4115
The voltage control of chip U4 DIM pin.
Specifically, obtained voltage signal and PIC16F1823 chip U6 inner settings 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, PIC16F1823 chips U6 14 pin output high level 5V, 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 PIC16F1823 chips U6 9 pin output dim signal
In 2.5V), the output current of optical circuit 70 that constant current is adjustable is that maximum is about 600mA.Therefore, as long as dim signal output circuit 60
Different dimmer voltage values are given to DIM pin, 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 and the dimmer voltage of dim signal output circuit 60 of the constant current adjustable output current value of optical circuit 70
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
Obtain the utility model and export more stable to the electric current of load；Relative to existing for the coagulation of sampled signal, one
The problem of level processing occurs such, be exactly that such as input voltage is on dimmer voltage critical value 38V when input voltage is unstable
When lower small range fluctuation, then export the phenomenon that fluctuation just occurs to the output current of load.And it is of the present utility model
Two stage treatment, is just not in above-mentioned phenomenon so that the stability of output circuit is higher.
Fig. 6 is refer to, in the utility model, low voltage start circuit 40 includes the first voltage-regulator diode ZD1, second steady
Press diode 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 second voltage-regulator diode ZD2 output head grounding, the output end PFC of pfc circuit module passes through the 19th resistance
R19 is connected to the second triode Q4 colelctor electrode, and the second triode Q4 base stage is connected to the second voltage-regulator diode ZD2 input
End, the second triode Q4 emitter stage is connected to the 3rd diode D3 input, and the 3rd diode D3 output end is connected to
DC-DC circuit module 20, and the 3rd diode D3 output end is connected to pfc circuit module 20；
First triode Q3 colelctor electrode is connected to the second triode Q4 base stage, and the first triode Q3 emitter stage connects
Ground, the first triode Q3 base stage is connected to the first voltage-regulator diode ZD1 output end by the 17th resistance R17, and first is steady
Pressure diode ZD1 input 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 turn on the second voltage-regulator diode ZD2, and now the second voltage-regulator diode ZD2 cathode voltage is the second voltage stabilizing two
Pole pipe ZD2 voltage stabilizing value, this voltage is added in the second triode Q4 base stage, 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 utility model can quickly start.
In addition, after the utility model normal work, 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 for the normal work for maintaining the utility model and pfc circuit module 20,
Meanwhile, the voltage can make the first triode Q3 saturation conductions, the first triode Q3 saturation conductions by the first voltage-regulator diode ZD1
The voltage Vce ≈ 0.1V between its colelctor electrode and emitter stage, so as to drag down the second triode Q4 base voltages, make the two or three pole afterwards
Pipe Q4 is turned off, start no electric current on resistance (the 19th resistance R19) after the second triode Q4 shut-offs and flow through, and noenergy disappears
Consumption.Therefore, low voltage start circuit 40 can reach the effect quickly started, will not increase extra power consumption again.
Fig. 7 is refer to, in the utility model, the full-bridge that pfc circuit module 20 includes being connected to EMI filter circuit 10 is whole
Current circuit 21, the π types filter circuit 22 for being connected to full bridge rectifier 21, the input sample electricity for being connected to π types filter circuit 22
Road 23, the booster circuit 24 for being connected to π types filter circuit 22, output sample circuit 25, the Yi Jilian for being connected to booster circuit 24
It is connected to input sampling 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 the 3rd electric capacity C3, series connection
4th resistance R4 and the 5th resistance R5 one end 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 L6562 chips U1 MULT pin (3 pin)；
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
Electric capacity C9, the 3rd inductance L3 input are connected to π types filter circuit 22, and the second diode D2 input is connected to the 3rd electricity
Feel L3 output end, the second diode D2 output end is connected to the 9th electric capacity C9, the first metal-oxide-semiconductor Q1 input is connected to the
Three inductance L3 output end, the first metal-oxide-semiconductor Q1 control end is connected to L6562 chips U1 GD pin (7 pin), 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
Piece U1 CS pin (4 pin), the 9th electric capacity C9 is electrochemical capacitor；
Exporting sample circuit 25 includes the 14th resistance R14, the 15th resistance R15 and the 16th resistance R16, the of series connection
14 resistance R14 and the 15th resistance R15 one end is connected to the second diode D2 output end, the 14th resistance of series connection
R14 and the 15th resistance the R15 other end are connected to L6562 chips U1 INV pin (1 pin) and the 16th resistance R16 of ground connection；
L6562 chips U1 VCC pin (8 pin) 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：3rd inductance L3 assists winding 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, L6562 chips U1 GD pin (7 pin) 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 by the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 in input sampling circuit 23 and inputted
Magnitude of voltage, sampling is combined by the 14th resistance R14, the 15th resistance R15, the 16th resistance R16 in output sample circuit 25
Output voltage values are obtained, two obtained magnitudes of voltage of sampling 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 up-samples what is obtained with resistance R13
Magnitude of voltage is compared, when the voltage on the 13rd resistance R13 reaches reference voltage level, L6562 chips U1 GD (7 pin) outputs
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 be power factor correction circuit, the circuit can improve power of the present utility model because
Element value, improves utilization rate of the utility model to power network, while reducing current harmonics, reduces pollution of the whole system to power network.
Fig. 9 is refer to, in the utility model, DC-DC circuit module 30 includes being connected to the output end of pfc circuit module 20
PFC chip control circuit 31, the clamp circuit 32 for being connected to chip control circuit 31, be connected to chip control circuit 31
One current rectifying and wave filtering circuit, the chip protection circuit 33 for being connected to the first current rectifying and wave filtering circuit, it is connected to chip control circuit 31
Second current rectifying and wave filtering circuit 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 control
Circuit 31 processed, chip protection circuit 33 and the OB5269 chips U2 for exporting 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
Winding TB and the second auxiliary winding TC transformer, primary winding TA input are connected to the output end PFC of pfc circuit module 20,
Primary winding TA output end is connected to the second metal-oxide-semiconductor Q2 input, and the second metal-oxide-semiconductor Q2 control end is connected to OB5269 chips
U2 DRV pin (5 pin), the second metal-oxide-semiconductor Q2 output end is connected to the 32nd resistance R32 of ground connection, the 32nd resistance R32
OB5269 chips U2 CS pin (3 pin) 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
Four diode D4 input is connected to primary winding TA output end, and the 4th diode D4 output end is connected to parallel combination
One end, primary winding TA input 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 6th diode D6 input
The first auxiliary winding TB positive terminal is connected to, the 6th diode D6 output end is connected to the tenth by the 24th resistance R24
Five electric capacity C15 positive pole, the 15th electric capacity C15 negative pole is connected to the first auxiliary winding TB negative pole end；
Chip protection circuit 33 includes the 4th voltage-regulator diode ZD4, the 26th resistance R26, the 11st electric capacity C11 and the
Four triode Q6, the 4th voltage-regulator diode ZD4 input is connected to the 15th electric capacity C15 positive pole, the 4th voltage-regulator diode
ZD4 output end is held by the 26th resistance R26 and the 11st electricity C11 of series connection to be grounded, and the 4th voltage-regulator diode ZD4
Output end is connected to the 4th triode Q6 base stage by the 26th resistance R26, and the 4th triode Q6 colelctor electrode is connected to
OB5269 chips U2 RT pin (1 pin), the 4th triode Q6 grounded emitter；
Second current rectifying and wave filtering circuit 34 includes the 8th diode D8 and the 18th electric capacity C18, the 8th diode D8 input
End is connected to the second auxiliary winding TC positive terminal, and the 18th electric capacity C18 positive pole is connected to the 8th diode D8 output end, the
18 electric capacity C18 negative pole is connected to the second auxiliary winding TC negative pole end；
Exporting feedback circuit 35 includes optocoupler, the 42nd resistance R42, the 43rd resistance R43, controllable accurate source of stable pressure
Q8, the light emitting diode Q7A of optocoupler input is connected to the second auxiliary winding TC positive terminal, the light emitting diode Q7A of optocoupler
Output end be connected to controllable accurate source of stable pressure Q8 negative electrode, the phototriode Q7B of optocoupler colelctor electrode is connected to OB5269
Chip U2 FB pin (2 pin), the phototriode Q7B of optocoupler grounded emitter；Controllable accurate source of stable pressure Q8 plus earth
And the 43rd resistance R43 is connected between controllable accurate source of stable pressure Q8 anode and reference pole, controllable accurate source of stable pressure Q8's
The 42nd electricity is connected between output end (the 18th electric capacity C18D positive pole) with reference to pole and the second current rectifying and wave filtering circuit 34
Hinder R42；
OB5269 chips U2 RT pin are grounded by the 27th resistance R27, OB5269 chips U2 GND pin ground connection,
OB5269 chips U2 VDD pin (6 pin) are connected to the 3rd diode D3 output end by the 3rd current rectifying and wave filtering circuit 36；Tenth
Five electric capacity C15 positive pole is connected to the first voltage-regulator diode ZD1 input.
The three or three is provided between the input of the output end of first current rectifying and wave filtering circuit and the 3rd current rectifying and wave filtering circuit 36
Level pipe Q5, the 3rd triode Q5 emitter stage are connected to the 5th diode D5 input, and the 3rd triode Q5 base stage passes through
25th resistance R25 is connected to the 15th electric capacity C15 positive pole, and the 3rd triode Q5 colelctor electrode passes through the 24th resistance
R24 is connected to the 6th diode D6 output end.
The main high-tension direct current of stablizing for exporting pfc circuit module 20 of DC-DC circuit module 30 is transformed into stabilization
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, after this induced voltage is by the rectifying and wave-filtering of the second current rectifying and wave filtering circuit 34
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 produces induced voltage, and the induced voltage is by the first current rectifying and wave filtering circuit, and one is to be delivered to
First voltage-regulator diode ZD1 of low-voltage starting circuit 40；Two are, pfc circuit mould is delivered to by the 3rd triode Q5 of conducting
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 of conducting
Road 36, and pass through the VDD pin (6 pin) that the 3rd current rectifying and wave filtering circuit 36 is delivered to OB5269 chips U2, it is that OB5269 chips U2 is supplied
Electricity.
Specifically, some cycle of the utility model normal work, the OB5269 chips U2 high electricity of DRV pin (5 pin) output
Flat to turn on the second metal-oxide-semiconductor Q2, now the electric current on the primary winding TA of transformer is linear rises, and electric current, which rises, can cause the 3rd
Voltage rise on 12 resistance R32, when the voltage on the 32nd resistance R3 reaches OB5269 chip U2 internal reference voltages
During value, OB5269 chips U2 DRV pin (5 pin) output low level turns off the second metal-oxide-semiconductor Q2, and now primary winding TA passes through respectively
First auxiliary winding TB and the second auxiliary winding TC rises to corresponding secondary transmission energy, secondary voltage, output voltage Vo increases.When
During R43*Vo/ (R42+R43) ＞ 2.5V, controllable accurate source of stable pressure Q8 conductings, while the light emitting diode Q7A of optocoupler is switched on,
The interior light emitting diodes Q7A of optocoupler lights after conducting, is received by its internal phototriode Q7B, phototriode Q7B
Conducting, OB5269 chips U2 FB pin (2 pin) voltage reduction and the ginseng less than OB5269 chips U2 after phototriode Q7B conductings
Magnitude of voltage is examined, now OB5269 chips U2 DRV pin (5 pin) output high level turns on the second metal-oxide-semiconductor Q2.OB5269 chips U2
Above-mentioned action is repeated, the utility model is had stable voltage output.
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 rise, 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 rise, make the 4th voltage-regulator diode ZD4, the 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, the 4th triode Q6 C, E voltage across poles is about 0.1V,
So as to which OB5269 chips U2 RT terminal voltages 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 utility model, it is ironed that EMI filter circuit 10 includes fuse F1, piezo-resistance VDR, height
Membrane capacitance 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 high voltage thin film electricity CX1 two ends.
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
Influence of the high frequency to equipment in power network；Suppress interference of the equipment to AC network simultaneously.
The flow of the utility model powering load is：Low-voltage ac voltage is after the filtering process of EMI filter circuit 10
It is converted into first voltage；First voltage becomes DC voltage, PFC electricity by the full-bridge rectifier filter in pfc circuit module 20 again
DC voltage progress boosting is converted into second voltage by road；Second voltage flows into DC-DC circuit module 30 below and through DC-
A stabilization, stable tertiary voltage are obtained after the second current rectifying and wave filtering circuit 34 in DC circuit modules 30；The tertiary voltage passes through
Load after the adjustable optical circuit 70 of constant current below to power supply institute band provides constant electric current.
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 utility model can quickly start.In addition, working as
After the utility model normal work, the second triode Q4 shut-offs start resistance (the 19th resistance after the second triode Q4 shut-offs
R19 no electric current flows through on), the consumption of noenergy.Therefore, low voltage start circuit 40 can reach the effect quickly started, again
Extra power consumption will not be increased.
Input voltage signal sampling of the present utility model, signal transacting, dim signal output and light modulation flow be：Hand over
Stream input voltage becomes the sampled voltage of amplitude very little after alternating current sample circuit 50, and the sampled voltage is admitted to dim signal
Output circuit 60, judges the size of AC-input voltage, can to constant current further according to the size output dim signal of input voltage
Light adjusting circuit 70, the output current of constant current the is adjustable whole power supply of 70 pairs of optical circuit is controlled, so as to change the luminous of traffic lights
Brightness.
Wherein, the two stage treatment of sampled signal is made by dim signal output circuit 60 and constant current adjustable optical circuit 70
Obtain the utility model and export more stable to the electric current of load；Relative to existing for the coagulation of sampled signal, one
The problem of level processing occurs such, be exactly that such as input voltage is on dimmer voltage critical value 38V when input voltage is unstable
When lower small range fluctuation, then export the phenomenon that fluctuation just occurs to the output current of load.And it is of the present utility model
Two stage treatment, is just not in above-mentioned phenomenon so that the stability of output circuit is higher.
Implement low-voltage dimming power source of the present utility model, have the advantages that：First, pass through low alternating voltage
Input is set, and is reduced using potential safety hazard during electricity；Second, by alternating current sample circuit, dim signal output circuit and
The setting of constant current is 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, hands in addition
The electric sampled signal of stream causes the steady of the output current of circuit by the processing of dim signal output circuit and the adjustable optical circuit of constant current
It is qualitative higher；3rd, by the setting of low voltage start circuit, shorten the startup time of the present utility model.
Embodiment of the present utility model is the foregoing is only, the scope of the claims of the present utility model is not thereby limited, it is every
The equivalent structure transformation made using the utility model specification and accompanying drawing content, or directly or indirectly it is used in other correlations
Technical field, is similarly included in scope of patent protection of the present utility model.
Claims (8)
1. a kind of low-voltage dimming power source, it is characterised in that including：
EMI filter circuit, for being filtered processing 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；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, 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 EMI filter circuit includes fuse, piezo-resistance, high voltage thin film electric capacity, the first inductance；
Wherein, the fuse is connected to the output end of alternating current fire wire, and the piezo-resistance and the high voltage thin film electric capacity are simultaneously
Connection is connected between live wire and zero line, and first inductance connection is in the two ends of high voltage thin film electricity.
2. low-voltage dimming power source according to claim 1, 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 second current rectifying and wave filtering circuit for being connected to the chip control circuit,
It is connected to the output feedback circuit of second current rectifying and wave filtering circuit and is connected to the chip control circuit and the output
The OB5269 chips of feedback circuit；
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；
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 and be 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
The 42nd resistance is connected between output end with reference to pole and second current rectifying and wave filtering circuit.
3. low-voltage dimming power source according to claim 2, it is characterised in that the RT pin of the OB5269 chips pass through
27 resistance eutral groundings, the GND pin ground connection of the OB5269 chips, the VDD pin of the OB5269 chips are filtered by the 3rd rectification
Wave circuit is connected to the output end of the 3rd diode；The positive pole of 15th electric capacity is connected to the input of the first voltage-regulator diode
End.
4. 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.
5. 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 pass through described
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 pass through the 49th resistance of series connection and institute
State the signal receiving end that the second isolating diode is connected to the adjustable optical circuit of the constant current.
6. 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 the resistor coupled in parallel formation, one resistance combination, 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 between the CSN pin of the PT4115 chips and is connected in resistance
Between pin.
7. low-voltage dimming power source according to claim 3, it is characterised in that the low voltage start circuit includes described
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 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, described by the 17th resistance
The input of one voltage-regulator diode is connected to the DC-DC circuit module.
8. low-voltage dimming power source according to claim 7, 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
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 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 passes through the 6th resistance in parallel and the 3rd electricity
Hold the MULT pin for being connected to 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 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 by 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720241475.9U CN206585802U (en) | 2017-03-13 | 2017-03-13 | Low-voltage dimming power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720241475.9U CN206585802U (en) | 2017-03-13 | 2017-03-13 | Low-voltage dimming power source |
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| Publication Number | Publication Date |
|---|---|
| CN206585802U true CN206585802U (en) | 2017-10-24 |
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ID=60112302
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109302772A (en) * | 2018-10-26 | 2019-02-01 | 株洲市众普森技术有限公司 | A kind of panel light power driving circuit |
| CN110504843A (en) * | 2019-07-02 | 2019-11-26 | 温州焕能超声波设备有限公司 | A kind of ultrasonic power |
| CN110753422A (en) * | 2019-10-19 | 2020-02-04 | 浙江凯耀照明有限责任公司 | Quick start circuit applied to operational amplifier building |
-
2017
- 2017-03-13 CN CN201720241475.9U patent/CN206585802U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109302772A (en) * | 2018-10-26 | 2019-02-01 | 株洲市众普森技术有限公司 | A kind of panel light power driving circuit |
| CN110504843A (en) * | 2019-07-02 | 2019-11-26 | 温州焕能超声波设备有限公司 | A kind of ultrasonic power |
| CN110753422A (en) * | 2019-10-19 | 2020-02-04 | 浙江凯耀照明有限责任公司 | Quick start circuit applied to operational amplifier building |
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