CN103680174B - Low dash current high power factor energy storage type countdown display circuit - Google Patents
Low dash current high power factor energy storage type countdown display circuit Download PDFInfo
- Publication number
- CN103680174B CN103680174B CN201310646507.XA CN201310646507A CN103680174B CN 103680174 B CN103680174 B CN 103680174B CN 201310646507 A CN201310646507 A CN 201310646507A CN 103680174 B CN103680174 B CN 103680174B
- Authority
- CN
- China
- Prior art keywords
- circuit
- switching power
- connects
- resistance
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention provides a kind of low dash current high power factor energy storage type countdown display circuit, comprising: signal lamp power taking rectification circuit, isolation sample circuit, AC-DC switching power circuit, DC-DC direct-current voltage reducing circuit, MCU control circuit, LED matrix display module; The input end of signal lamp power taking rectification circuit connects signal red light power supply, green signal light power supply and common port, and the positive output end of signal lamp power taking rectification circuit connects the input end of AC-DC switching power circuit; Storage capacitor is parallel with between the output terminal of AC-DC switching power circuit and ground; The output terminal of AC-DC switching power circuit connects DC-DC direct-current voltage reducing circuit; Power to MCU control circuit and LED matrix display module after the DC voltage step-down that AC-DC switching power circuit exports by DC-DC direct-current voltage reducing circuit; MCU control circuit connects signal red light power supply, green signal light power supply and common port by isolation sample circuit.
Description
Technical field
The present invention relates to a kind of signal lamp countdown circuit, especially a kind of low dash current high power factor energy storage type countdown display circuit.
Background technology
Along with the continuous expansion of city size, the increasing of road and motor vehicles, the technicalization level of control of traffic and road is also improving constantly, wherein road junction signal controls to become one of its important means, in traffic signalization, crossroads traffic light let pass the time number and presentation mode no matter for pedestrian or motor vehicle driving personnel, all there is very important meaning directly perceived.Reverse-timing display device plays and vital role at traffic intersection, remaining for the traffic lights clearance time can display by timely and accurately, vehicle driver is by observing countdown display, carry out preparation that is current or that stop in advance, so that quick and safe by crossing, thus ensure that traffic safety is unimpeded.Reverse-timing display device device is as a additional transport signal lamp, The Ministry of Public Security of the People's Republic of China, MOPS proposes industry standard, refer to " count down display for road traffic signal (GA/T508-2004) " standard, this standard is mainly to reverse-timing display device outward appearance, structure, electrically, optics etc. claims.
Countdown display device way to take power is two kinds: 1, direct operated type: need draw AC220V output line from teleseme switch board, as the power input line of countdown display module, this power supply mode, wiring is complicated, cost is wasted, the general countdown display screen load being only greater than 20W for power.2, signal lamp charging type: directly from lamp group (red, yellow, and green) power taking that will learn, this power supply mode, need not connect up specially, but the load (as count-down screen display system) being generally applicable to that power is less than 20W
.
Because traffic signals machine controller only controls to export garage's lamp (red, yellow, and green lamp group) and pedestrian lamp (red, green light group) power supply, control to export without reverse-timing display device modular power source, so countdown display device way to take power generally selects the second, directly from the reddish yellow green signal light group power taking that will learn, see Fig. 1 signal lamp power taking rectifying part, between red (or green) signal lamp live wire and common port by after diode rectification for control system is powered.But this power taking pattern existing defects, due to traffic signals machine controller to garage's lamp or pedestrian lamp lamp group carry out baseband signal conversion time, evergreen look step sequential generally follows blue flash look step, between the low period of blue flash look step, countdown display device cannot normal power supply, the display of load LED matrix there will be shake or Quench, when between the high period of blue flash, countdown display device normal power supply, LED display recovers normal, thus in whole blue flash look step period, count-down screen can not normally show.Institute thinks and guarantees that countdown normally shows, and need increase storage capacitor, traditional energy storage bulky capacitor is positioned over diode rectification end (see figure 1), and when the low level time of blue flash, energy storage bulky capacitor carries out electric discharge to late-class circuit and guarantees system stability work.But energy storage bulky capacitor is positioned over elementary, can bring a series of adverse consequences, as reduced Switching Power Supply power factor (PF), countdown starts the larger dash current of existence, and when dash current causes greatly traffic signaling equipment to start, air switch is protected.Given this shortcoming, circuit improves, and from safety, dynamical angle, develops a kind of low dash current high power factor energy storage type countdown display circuit tool and is of great significance.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art; a kind of low dash current high power factor energy storage type countdown display circuit is provided; this circuit can meet GB " road traffic signal lamp (GB14887-2011) " high PFC(power factor correction) requirement; the requirement such as energy storage for power supply, systems stabilisation work can be met again; especially low dash current starts can not bring very big stress to electrical network, also can not cause the overcurrent protections such as air switch.The technical solution used in the present invention is:
A kind of low dash current high power factor energy storage type countdown display circuit, comprising:
Signal lamp power taking rectification circuit, isolation sample circuit, AC-DC switching power circuit, DC-DC direct-current voltage reducing circuit, MCU control circuit, LED matrix display module; The input end of signal lamp power taking rectification circuit connects signal red light power supply, green signal light power supply and common port, and the positive output end of signal lamp power taking rectification circuit connects the input end of AC-DC switching power circuit; Filter capacitor is parallel with between the input end of AC-DC switching power circuit and ground; One or more storage capacitor is parallel with between the output terminal of AC-DC switching power circuit and ground; The output terminal of AC-DC switching power circuit connects DC-DC direct-current voltage reducing circuit; Power to MCU control circuit and LED matrix display module after the DC voltage step-down that AC-DC switching power circuit exports by DC-DC direct-current voltage reducing circuit; MCU control circuit connects signal red light power supply, green signal light power supply and common port by isolation sample circuit, learns the duration that each signal lamp is often bright and/or glittering, and driving LED matrix display module does corresponding countdown display.
Further, described AC-DC switching power circuit forms primarily of transformer T1, switching power source chip U1, comprise: the positive pole of filter capacitor C1, C1 as the positive output end of the input termination signal lamp power taking rectification circuit 1 of AC-DC switching power circuit 3, the minus earth of C1; The positive pole of the one termination capacitor C1 of resistance R1, one end of other end connecting resistance R2 and the multiplier input MULT of switching power source chip U1; The other end ground connection of resistance R2; One end of one end of positive pole connecting resistance R3 of electric capacity C1, one end of electric capacity C2 and transformer T1 armature winding; The other end of resistance R3 links together with the other end of electric capacity C2 and is connected the negative electrode of diode D7; The anode of another terminating diode D7 of transformer T1 armature winding and the drain electrode of metal-oxide-semiconductor Q1; The grid of metal-oxide-semiconductor Q1 meets the gate output terminal GD of switching power source chip U1; One end of the source electrode connecting resistance R4 of metal-oxide-semiconductor Q1 and the current detecting end CS of switching power source chip U1; The other end ground connection of resistance R4; Transformer T1 assists the anode of a terminating diode D8 of winding and the zero current sense terminal ZCD of switching power source chip U1, other end ground connection; The negative electrode of diode D8 connects the power end of switching power source chip U1; Between the negative electrode that filter capacitor C3 is connected in parallel on diode D8 and ground; One end of a terminating resistor R5 of transformer T1 secondary winding and one end of resistance R6, the anode of another termination photo-coupler U2 of resistance R5; One end of the other end connecting resistance R7 of resistance R6 and the reference pole of controlled source of stable pressure W1, the other end ground connection of resistance R7; The plus earth of controlled source of stable pressure W1, negative electrode connects the negative electrode of photo-coupler U2; One end of transformer T1 secondary winding is as the output terminal of AC-DC switching power circuit 3; The collector of photo-coupler U2 connects the negative electrode of diode D8, the emitter of photo-coupler U2 connects the error amplifier inverting input INV of switching power source chip U1 and one end of electric capacity C4, the error amplifier output COMP of another termination switching power source chip U1 of electric capacity C4; The other end ground connection of transformer T1 secondary winding; One or more storage capacitor is connected in parallel between transformer T1 secondary winding two end.
Further, described switching power source chip U1 adopts L6561 switching power source chip; Described photo-coupler U2 adopts PC817 photo-coupler; Described controlled source of stable pressure W1 adopts the controlled source of stable pressure of TL431.
Further, described DC-DC direct-current voltage reducing circuit comprises a dc-dc U3; Dc-dc U3 adopts step-down switching voltage stabilizing chip L4962; One end of the input termination transformer T1 secondary winding of dc-dc U3, one end of output terminal connecting resistance R8 also exports DC voltage VCC, one end of other end connecting resistance R9 of resistance R8 and the feedback end Feedback of dc-dc U3; The other end ground connection of resistance R9.
Further, described MCU control circuit comprises linear voltage decreasing module U4, MCU microcontroller and constant-current driven module; The input termination DC voltage VCC of linear voltage decreasing module U4, output terminal is that MCU microcontroller and constant-current driven module are powered; MCU microcontroller connects signal red light power supply, green signal light power supply and common port by isolation sample circuit; MCU microprocessor controls constant-current driven module, by constant-current driven module driven MOS pipe Q2; The grid of metal-oxide-semiconductor Q2 connects the output terminal of constant-current driven module, source ground, and drain electrode connects LED matrix display module.
MCU microcontroller adopts single-chip microcomputer; Linear voltage decreasing module U4 adopts 7805 step-down integrated packages; Constant-current driven module adopts MBI5026 display driver integrated package.
Further, described LED matrix display module connects the drain electrode of DC voltage VCC and metal-oxide-semiconductor Q2 respectively.
Further, described signal lamp power taking rectification circuit comprises diode D1, D2, D3, D4, D5, D6; Signal red light power supply connects the anode of diode D1 and the negative electrode of D2; Green signal light power supply connects the anode of diode D3 and the negative electrode of D4; The public anode of terminating diode D5 and the negative electrode of D6; The negative electrode of diode D1, D3 and D5 links together, as the positive output end of signal lamp power taking rectification circuit 1; The plus earth of diode D2, D4 and D6.
Further, the value of described filter capacitor C1 is 0.1uF; The storage capacitor be connected in parallel between transformer T1 secondary winding two end is two, and value is 4700uF.
Advantage of the present invention: this countdown circuit, is positioned over transformer secondary output storage capacitor, has energy storage effect equally, the equipment that both decreased impacts the starting current of electrical network, has again high power factor (PF).Whole circuit structure is novel, and small-power power design ap-plication has directive significance.
Accompanying drawing explanation
Fig. 1 is the countdown circuit before not improving.
Fig. 2 is the countdown circuit after improving.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
Low dash current high power factor energy storage type countdown display circuit after the improvement that the present invention proposes as shown in Figure 2, comprising: signal lamp power taking rectification circuit 1, isolation sample circuit 2, AC-DC switching power circuit 3, DC-DC direct-current voltage reducing circuit 4, MCU control circuit 5, LED matrix display module 6.
The input end of signal lamp power taking rectification circuit 1 connects signal red light power supply, green signal light power supply and common port, and the positive output end of signal lamp power taking rectification circuit 1 connects the input end of AC-DC switching power circuit 3; Wherein, signal red light power supply, green signal light power supply and common port are all from the output of traffic signals machine controller, and they are also connected with signal lamp group.The present invention is from output (the namely signal lamp group side) power taking of traffic signals machine controller.
Filter capacitor is parallel with between the input end of AC-DC switching power circuit 3 and ground; One or more storage capacitor is parallel with between the output terminal of AC-DC switching power circuit 3 and ground; The output terminal of AC-DC switching power circuit 3 connects DC-DC direct-current voltage reducing circuit 4; Power after the DC voltage step-down that AC-DC switching power circuit 3 exports by DC-DC direct-current voltage reducing circuit 4 to MCU control circuit 5 and LED matrix display module 6; MCU control circuit 5 connects signal red light power supply, green signal light power supply and common port by isolation sample circuit 2, learns the duration that each signal lamp is often bright and/or glittering, and driving LED matrix display module 6 does corresponding countdown display.
Signal lamp power taking rectification circuit 1 comprises diode D1, D2, D3, D4, D5, D6; Signal red light power supply connects the anode of diode D1 and the negative electrode of D2; Green signal light power supply connects the anode of diode D3 and the negative electrode of D4; The public anode of terminating diode D5 and the negative electrode of D6; The negative electrode of diode D1, D3 and D5 links together, as the positive output end of signal lamp power taking rectification circuit 1; The plus earth of diode D2, D4 and D6.
Red, green signal light power supply AC220V inputs a point two-way and inputs this countdown circuit, one tunnel through above-mentioned signal lamp power taking rectification circuit 1 commutation supply voltage to AC-DC switching power circuit 3, isolation sample circuit 2 of separately leading up to outputs to MCU control circuit 5, for MCU control circuit 5 from signal red light power supply, green signal light power supply learning signal lamp often bright and/or glittering duration.
Isolation sample circuit 2 can adopt common PC814 photo-coupler to make, because there is two paths of signals, so need two PC814.Isolation sample circuit 2 converts red, the isolation of green signal light mains alternating voltage low-voltage signal to, and inputs to the sampled I/O mouth of the MCU microcontroller 51 in MCU control circuit 5.
AC-DC switching power circuit 3 forms primarily of transformer T1, switching power source chip U1, comprising: the positive pole of filter capacitor C1, C1 as the positive output end of the input termination signal lamp power taking rectification circuit 1 of AC-DC switching power circuit 3, the minus earth of C1; The positive pole of the one termination capacitor C1 of resistance R1, one end of other end connecting resistance R2 and the multiplier input MULT of switching power source chip U1; The other end ground connection of resistance R2; One end of one end of positive pole connecting resistance R3 of electric capacity C1, one end of electric capacity C2 and transformer T1 armature winding; The other end of resistance R3 links together with the other end of electric capacity C2 and is connected the negative electrode of diode D7; The anode of another terminating diode D7 of transformer T1 armature winding and the drain electrode of metal-oxide-semiconductor Q1; The grid of metal-oxide-semiconductor Q1 meets the gate output terminal GD of switching power source chip U1; One end of the source electrode connecting resistance R4 of metal-oxide-semiconductor Q1 and the current detecting end CS of switching power source chip U1; The other end ground connection of resistance R4; Transformer T1 assists the anode of a terminating diode D8 of winding and the zero current sense terminal ZCD of switching power source chip U1, other end ground connection; The negative electrode of diode D8 connects the power end of switching power source chip U1; Between the negative electrode that filter capacitor C3 is connected in parallel on diode D8 and ground; One end of a terminating resistor R5 of transformer T1 secondary winding and one end of resistance R6, the anode of another termination photo-coupler U2 of resistance R5; One end of the other end connecting resistance R7 of resistance R6 and the reference pole of controlled source of stable pressure W1, the other end ground connection of resistance R7; The plus earth of controlled source of stable pressure W1, negative electrode connects the negative electrode of photo-coupler U2; One end of transformer T1 secondary winding is as the output terminal of AC-DC switching power circuit 3; The collector of photo-coupler U2 connects the negative electrode of diode D8, the emitter of photo-coupler U2 connects the error amplifier inverting input INV of switching power source chip U1 and one end of electric capacity C4, the error amplifier output COMP of another termination switching power source chip U1 of electric capacity C4; The other end ground connection of transformer T1 secondary winding; One or more storage capacitor is connected in parallel between transformer T1 secondary winding two end.In Fig. 2, storage capacitor is for being connected in parallel on C5 and C6 between transformer T1 secondary winding two end.The value of C5 and C6 is that 4700uf can meet actual operation requirements.The output of transformer T1 secondary winding is 40v.
Switching power source chip U1 can adopt L6561 switching power source chip; Photo-coupler U2 adopts PC817 photo-coupler; Controlled source of stable pressure W1 adopts the controlled source of stable pressure of TL431.
Switching power source chip U1 selects L6561, and the electric source topology type of AC-DC switching power circuit 3 adopts the single-ended reaction type transducer of Flyback Coverter.L6561 chip has PFC calibration function, and inside comprises error amplifier, multiplier, current sense comparator, zero current detection, push-pull type gate output circuit etc.1. error amplifier: INV pin becomes anti-phase relation with gate output terminal GD, when the inner 2.5V reference voltage of INV pin voltage ratio is high, GD end can reduce metal-oxide-semiconductor Q1 ON time; 2. multiplier: MULT pin is used for Sample AC input voltage, so that primary winding inductance current tracking AC sine envelope, improves power factor (PF); 3. current sense comparator: CS pin sampling current-limiting resistance (i.e. R4) electric current, this current-limiting resistance string is in the source electrode of metal-oxide-semiconductor Q1, CS pin becomes anti-phase relation with gate output terminal GD, when detection of primary winding current excessive (namely metal-oxide-semiconductor Q1 ON time is long), then shorten GD pin driven MOS pipe Q1 ON time; 4. zero current detection: the auxiliary winding current of ZCD pin sampling, auxiliary winding is coupled in armature winding with certain turn ratio by magnetic core of transformer, when load consumption energy to primary winding current is zero, auxiliary winding current also will be zero, then can open gate output terminal GD driven MOS pipe Q1; 5. push-pull type gate exports: GD pin exports high level, is determined, open metal-oxide-semiconductor Q1 by zero current detector; GD pin output low level, is determined by current sense comparator, turns off metal-oxide-semiconductor Q1.
This kind of AC-DC switching power circuit 3 electric source modes adopts reaction type transducer; metal-oxide-semiconductor Q1 blocking interval; the leakage inductance of primary winding can form high pressure inverse electromotive force, for preventing high back voltage from puncturing metal-oxide-semiconductor Q1, need add clamping circuit protection metal-oxide-semiconductor in primary.Namely resistance R3 in Fig. 2, electric capacity C2 and diode D7 form clamping circuit.Photo-coupler U2 exports transformer 40V and carries out isolation sampling, controlled source of stable pressure W1 plays error amplifier effect, when output 40V voltage has fluctuation (as increased), controlled source of stable pressure W1 carries out error amplification, and the electric current flowing through controlled source of stable pressure W1 also increases, and the input current of photo-coupler U2 also increases, the INV pin sampled voltage of switching power source chip L6561 also increases, and INV pin and GD are output into inverse ratio, GD pin shortens metal-oxide-semiconductor Q1 ON time, thus constant voltage effect is played in reduction output.
The AC-DC switching power circuit of comparison diagram 1 and Fig. 2, old scheme in Fig. 1 is positioned over primary storage capacitor, and capacitance value is determined according to bearing power, and electric capacity material selection ripple current is little, the high-voltage electrolytic capacitor that equivalent series resistance is little, this electric capacity volume is large and expensive.The storage capacitor being placed in primary can reduce Switching Power Supply power factor (PF), causes countdown circuit start to there is larger dash current.AC-DC switching power circuit in Fig. 2 of the present invention have employed the L6561 switching power source chip with PFC calibration function, storage capacitor is placed in transformer output terminal, only need several low-voltage electrolysis electric capacity, transformer inputs only need select miniature thin-film electric capacity, filter away high frequency noise, low-voltage electrolysis electric capacity, the little cost of thin-film capacitor volume are low.
About the comparison of power factor (PF).The AC-DC part of Fig. 1 and Fig. 2 belongs to Switching Power Supply, all belongs to non-linear circuit.It is a Large Copacity storage capacitor after Fig. 1 rectifier bridge, the positive pole of bulky capacitor produces unstable DC voltage, non-linear according to commutation diode, only have when input voltage is greater than voltage Vpk(voltage peak on electric capacity) time diode just conducting, because the line voltage most of the time is lower than voltage on capacitor, therefore electrical network every half period commutator tube only has very little portion of time conducting (about 3mS), within the time that this is extremely short, power electric fails to be convened for lack of a quorum and forms a series of very narrow pulse, its Amplitude Ratio DC value is high five to ten times, this current waveform contains a large amount of harmonic wave according to fourier analysis, as third-harmonic component reaches 77.5%, quintuple harmonics reaches 50.3%, total harmonic distortion (THD) reaches 95.6%, input power factor only has about 0.683.So although Fig. 1 scheme input voltage is sinusoidal wave, there is very large distortion in input current, containing a large amount of harmonic wave situation, power factor (PF) is extremely low.In Fig. 2, storage capacitor is placed in transformer output terminal, the input stage of transformer only adopts low capacity 0.1UF/250V thin-film capacitor (i.e. C1) filter away high frequency noise, therefore input current abnormality is little, and power supply chip L6561 has PFC calibration function, on the one hand the multiplier of input voltage sinusoidal waveform sampling for L6561 is inputted, so that primary winding inductance current tracking sinusoidal envelope, improve power factor (PF); On the other hand transformer output voltage is fed back to the error amplifier of L6561, reduce input current waveform distortion, also improve power factor (PF).So design of the present invention can meet power factor PF>0.9 requirement.
Transformer T1 output terminal carries out second level DC-DC.DC-DC direct-current voltage reducing circuit 4 comprises a dc-dc U3; Dc-dc U3 adopts step-down switching voltage stabilizing chip L4962; One end of the input termination transformer T1 secondary winding of dc-dc U3, one end of output terminal connecting resistance R8 also exports DC voltage VCC, one end of other end connecting resistance R9 of resistance R8 and the feedback end Feedback of dc-dc U3; The other end ground connection of resistance R9.The topological classification sampling buck buck circuit of this supply convertor, input voltage 40V, constant voltage exports VCC (about 12V), powers to MCU control circuit 5 and LED matrix display module 6.L4962 chip internal has PWM comparer, error comparator, 5.1V reference voltage source etc.Output voltage VCC, with two electric resistance partial pressure samplings for chip feedback end FeedBack, FeedBack is chip internal error comparator inverting input, inner 5.1V reference voltage connects error comparator in-phase input end, error amplifier output connects the input of PWM comparer homophase, and PWM comparer exports and controls power level on-off circuit.When fluctuation appears in VCC voltage, such as increase, FeedBack terminal voltage also increases, and PWM output can reduce switching tube ON time, thus reduces VCC voltage, plays constant voltage effect.
By AC-DC, DC-DC two-stage circuit of this uniqueness, when flicker appears in signal lamp, in the low level period of flicker, the input of AC-DC switching power circuit 3 non-transformer does not work, but DC-DC direct-current voltage reducing circuit 4 works on due to storage capacitor C5, C6, guarantee that the low level period of glimmering exports 12V, so whole look step comprises the flicker stage, count-down screen can normally show.
MCU control circuit 5 comprises linear voltage decreasing module U4, MCU microcontroller 51 and constant-current driven module 52; MCU control circuit 5 is not improvement emphasis of the present invention, slightly introduces at this.The input termination DC voltage VCC of linear voltage decreasing module U4, output terminal is that MCU microcontroller 51 and constant-current driven module 52 are powered; MCU microcontroller 51 connects signal red light power supply, green signal light power supply and common port by isolation sample circuit 2; MCU microcontroller 51 controls constant-current driven module 52, by constant-current driven module 52 driven MOS pipe Q2; The grid of metal-oxide-semiconductor Q2 connects the output terminal of constant-current driven module 52, source ground, and drain electrode connects LED matrix display module 6.MCU microcontroller 51 adopts single-chip microcomputer; Linear voltage decreasing module U4 adopts 7805 step-down integrated packages; Constant-current driven module 52 adopts MBI5026 display driver integrated package.
LED matrix display module 6, as countdown display screen, is made up of individual, ten 7 segment encodes.LED matrix display module 6 connects the DC voltage VCC of DC-DC direct-current voltage reducing circuit 4 output and the drain electrode of metal-oxide-semiconductor Q2 respectively.
This countdown circuit, is positioned over transformer secondary output storage capacitor, has energy storage effect equally, and the equipment that both decreased impacts the starting current of electrical network, has again high power factor (PF).Whole circuit structure is novel, and small-power power design ap-plication has directive significance.
Claims (8)
1. a low dash current high power factor energy storage type countdown display circuit, is characterized in that, comprising:
Signal lamp power taking rectification circuit (1), isolation sample circuit (2), AC-DC switching power circuit (3), DC-DC direct-current voltage reducing circuit (4), MCU control circuit (5), LED matrix display module (6);
The input end of signal lamp power taking rectification circuit (1) connects signal red light power supply, green signal light power supply and common port, and the positive output end of signal lamp power taking rectification circuit (1) connects the input end of AC-DC switching power circuit (3);
Filter capacitor is parallel with between the input end of AC-DC switching power circuit (3) and ground; One or more storage capacitor is parallel with between the output terminal of AC-DC switching power circuit (3) and ground; The output terminal of AC-DC switching power circuit (3) connects DC-DC direct-current voltage reducing circuit (4); Power after the DC voltage step-down that AC-DC switching power circuit (3) exports by DC-DC direct-current voltage reducing circuit (4) to MCU control circuit (5) and LED matrix display module (6);
MCU control circuit (5) connects signal red light power supply, green signal light power supply and common port by isolation sample circuit (2), learn the duration that each signal lamp is often bright and/or glittering, and driving LED matrix display module (6) does corresponding countdown display;
Described AC-DC switching power circuit (3) forms primarily of transformer T1, switching power source chip U1, comprising:
The positive pole of filter capacitor C1, C1 as the positive output end of the input termination signal lamp power taking rectification circuit 1 of AC-DC switching power circuit (3), the minus earth of C1;
The positive pole of the one termination capacitor C1 of resistance R1, one end of other end connecting resistance R2 and the multiplier input MULT of switching power source chip U1; The other end ground connection of resistance R2;
One end of one end of positive pole connecting resistance R3 of electric capacity C1, one end of electric capacity C2 and transformer T1 armature winding; The other end of resistance R3 links together with the other end of electric capacity C2 and is connected the negative electrode of diode D7; The anode of another terminating diode D7 of transformer T1 armature winding and the drain electrode of metal-oxide-semiconductor Q1; The grid of metal-oxide-semiconductor Q1 meets the gate output terminal GD of switching power source chip U1; One end of the source electrode connecting resistance R4 of metal-oxide-semiconductor Q1 and the current detecting end CS of switching power source chip U1; The other end ground connection of resistance R4;
Transformer T1 assists the anode of a terminating diode D8 of winding and the zero current sense terminal ZCD of switching power source chip U1, other end ground connection; The negative electrode of diode D8 connects the power end of switching power source chip U1; Between the negative electrode that filter capacitor C3 is connected in parallel on diode D8 and ground;
One end of a terminating resistor R5 of transformer T1 secondary winding and one end of resistance R6, the anode of another termination photo-coupler U2 of resistance R5; One end of the other end connecting resistance R7 of resistance R6 and the reference pole of controlled source of stable pressure W1, the other end ground connection of resistance R7; The plus earth of controlled source of stable pressure W1, negative electrode connects the negative electrode of photo-coupler U2; One end of transformer T1 secondary winding is as the output terminal of AC-DC switching power circuit 3;
The collector of photo-coupler U2 connects the negative electrode of diode D8, the emitter of photo-coupler U2 connects the error amplifier inverting input INV of switching power source chip U1 and one end of electric capacity C4, the error amplifier output COMP of another termination switching power source chip U1 of electric capacity C4;
The other end ground connection of transformer T1 secondary winding; One or more storage capacitor is connected in parallel between transformer T1 secondary winding two end.
2. low dash current high power factor energy storage type countdown display circuit as claimed in claim 1, is characterized in that: described switching power source chip U1 adopts L6561 switching power source chip; Described photo-coupler U2 adopts PC817 photo-coupler; Described controlled source of stable pressure W1 adopts the controlled source of stable pressure of TL431.
3. low dash current high power factor energy storage type countdown display circuit as claimed in claim 1 or 2, is characterized in that: described DC-DC direct-current voltage reducing circuit (4) comprises a dc-dc U3; Dc-dc U3 adopts step-down switching voltage stabilizing chip L4962; One end of the input termination transformer T1 secondary winding of dc-dc U3, one end of output terminal connecting resistance R8 also exports DC voltage VCC, one end of other end connecting resistance R9 of resistance R8 and the feedback end Feedback of dc-dc U3; The other end ground connection of resistance R9.
4. low dash current high power factor energy storage type countdown display circuit as claimed in claim 3, is characterized in that: described MCU control circuit (5) comprises linear voltage decreasing module U4, MCU microcontroller (51) and constant-current driven module (52);
The input termination DC voltage VCC of linear voltage decreasing module U4, output terminal is MCU microcontroller (51) and constant-current driven module (52) power supply; MCU microcontroller (51) connects signal red light power supply, green signal light power supply and common port by isolation sample circuit (2); MCU microcontroller (51) controls constant-current driven module (52), by constant-current driven module (52) driven MOS pipe Q2; The grid of metal-oxide-semiconductor Q2 connects the output terminal of constant-current driven module (52), source ground, and drain electrode connects LED matrix display module (6).
5. low dash current high power factor energy storage type countdown display circuit as claimed in claim 4, is characterized in that: MCU microcontroller (51) adopts single-chip microcomputer; Linear voltage decreasing module U4 adopts 7805 step-down integrated packages; Constant-current driven module (52) adopts MBI5026 display driver integrated package.
6. low dash current high power factor energy storage type countdown display circuit as claimed in claim 4, is characterized in that: described LED matrix display module (6) connects the drain electrode of DC voltage VCC and metal-oxide-semiconductor Q2 respectively.
7. low dash current high power factor energy storage type countdown display circuit as claimed in claim 1 or 2, is characterized in that: described signal lamp power taking rectification circuit (1) comprises diode D1, D2, D3, D4, D5, D6; Signal red light power supply connects the anode of diode D1 and the negative electrode of D2; Green signal light power supply connects the anode of diode D3 and the negative electrode of D4; The public anode of terminating diode D5 and the negative electrode of D6; The negative electrode of diode D1, D3 and D5 links together, as the positive output end of signal lamp power taking rectification circuit (1); The plus earth of diode D2, D4 and D6.
8. low dash current high power factor energy storage type countdown display circuit as claimed in claim 1 or 2, is characterized in that: the value of described filter capacitor C1 is 0.1uF; The storage capacitor be connected in parallel between transformer T1 secondary winding two end is two, and value is 4700uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310646507.XA CN103680174B (en) | 2013-12-04 | 2013-12-04 | Low dash current high power factor energy storage type countdown display circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310646507.XA CN103680174B (en) | 2013-12-04 | 2013-12-04 | Low dash current high power factor energy storage type countdown display circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103680174A CN103680174A (en) | 2014-03-26 |
| CN103680174B true CN103680174B (en) | 2015-10-28 |
Family
ID=50317586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310646507.XA Active CN103680174B (en) | 2013-12-04 | 2013-12-04 | Low dash current high power factor energy storage type countdown display circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103680174B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104540308B (en) * | 2015-01-28 | 2017-08-11 | 广西盛和电子科技股份有限公司 | A kind of isolation drive power supply of LED illumination lamp |
| CN104837269A (en) * | 2015-05-15 | 2015-08-12 | 重庆星联云科科技发展有限公司 | LED drive power supply with auxiliary power supply |
| DE112016001457T5 (en) * | 2015-06-09 | 2017-12-14 | Google Llc | A POWER SUPPLY INCLUDING RETURN CONTROL AND DOWNWARD TRANSFORMER |
| CN105006953A (en) * | 2015-07-13 | 2015-10-28 | 苏州经贸职业技术学院 | Switching power supply circuit based on L4962 voltage stabilization chip |
| CN106297325A (en) * | 2016-10-13 | 2017-01-04 | 烟台大学 | A kind of self adaptation pulsed signal machine signal lamp control system |
| CN109872549A (en) * | 2019-03-18 | 2019-06-11 | 深圳市赛诺杰科技有限公司 | A kind of power supply circuit that can continuously power and the traffic-control unit based on it |
| CN111864616B (en) * | 2020-06-22 | 2022-07-12 | 深圳供电局有限公司 | Display device control circuit and five-prevention locking system |
| CN115134978A (en) * | 2021-04-16 | 2022-09-30 | 深圳市紫光新能源技术有限公司 | Lamp control system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3434016A (en) * | 1966-11-07 | 1969-03-18 | Crouse Hinds Co | Traffic signal system |
| KR100577746B1 (en) * | 2006-03-31 | 2006-05-11 | 주식회사 이노바텍 | Power supply system for device indicating remained time of traffic signal lamp |
| CN1773567A (en) * | 2005-10-19 | 2006-05-17 | 烟台昌达交通电子有限公司 | Power supply method for traffic light inverted timing device |
| CN200990708Y (en) * | 2006-06-20 | 2007-12-12 | 上海澳星照明电器制造有限公司 | Adaptive LED back timing signal lamp intelligent electric source control switch |
| CN201060557Y (en) * | 2007-03-30 | 2008-05-14 | 上海澳星照明电器制造有限公司 | Passerby time counting traffic light using APFC boosting accumulation energy technique |
| CN201142143Y (en) * | 2007-12-28 | 2008-10-29 | 鞍钢集团自动化公司 | LED traffic countdown display controller |
| CN202177974U (en) * | 2011-08-19 | 2012-03-28 | 中国长城计算机深圳股份有限公司 | LED traffic signal lamp and drive circuit thereof |
-
2013
- 2013-12-04 CN CN201310646507.XA patent/CN103680174B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3434016A (en) * | 1966-11-07 | 1969-03-18 | Crouse Hinds Co | Traffic signal system |
| CN1773567A (en) * | 2005-10-19 | 2006-05-17 | 烟台昌达交通电子有限公司 | Power supply method for traffic light inverted timing device |
| KR100577746B1 (en) * | 2006-03-31 | 2006-05-11 | 주식회사 이노바텍 | Power supply system for device indicating remained time of traffic signal lamp |
| CN200990708Y (en) * | 2006-06-20 | 2007-12-12 | 上海澳星照明电器制造有限公司 | Adaptive LED back timing signal lamp intelligent electric source control switch |
| CN201060557Y (en) * | 2007-03-30 | 2008-05-14 | 上海澳星照明电器制造有限公司 | Passerby time counting traffic light using APFC boosting accumulation energy technique |
| CN201142143Y (en) * | 2007-12-28 | 2008-10-29 | 鞍钢集团自动化公司 | LED traffic countdown display controller |
| CN202177974U (en) * | 2011-08-19 | 2012-03-28 | 中国长城计算机深圳股份有限公司 | LED traffic signal lamp and drive circuit thereof |
Non-Patent Citations (1)
| Title |
|---|
| 利用恒流驱动技术的10_80V宽电压输入串联型开关电源;金永镐;《延边大学学报（自然科学版）》;20120930;第38卷(第3期);第232-235页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103680174A (en) | 2014-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103680174B (en) | Low dash current high power factor energy storage type countdown display circuit | |
| CN103442501B (en) | Forced constant flow source dimming LED (Light Emitting Diode) lamp | |
| CN201805600U (en) | Primary-side constant-current control device of LED driver | |
| CN201663735U (en) | LED power supply | |
| CN101636022A (en) | Power supply controller of high-efficiency energy-saving LED lamp | |
| CN201813599U (en) | LED (Light-Emitting Diode) dimmer power | |
| CN104202862B (en) | Single-stage type LED drive power supply without electrolytic capacitor | |
| CN106793339A (en) | Self adaptation line voltage compensation LED drive circuit based on primary side feedback | |
| CN102014557A (en) | LED dimming power supply | |
| CN201830521U (en) | Offline type high-power LED (light-emitting diode) constant-current drive power supply | |
| CN109152134A (en) | Multichannel dimming drive system | |
| CN201418184Y (en) | Constant-current driving power for high-power LED | |
| CN103369769B (en) | LED fly-back constant-current drive circuit | |
| CN103338560A (en) | LED supply circuit | |
| CN103220868A (en) | High-power light emitting diode (LED) switching power supply | |
| CN208508805U (en) | Intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance | |
| CN206364710U (en) | Intelligent half-bridge amendment wave voltage change-over circuit based on PFC Yu LLC resonance | |
| CN203181299U (en) | Constant-current driving circuit structure for small-power lamps | |
| CN104507238A (en) | LED (light emitting diode) driving power supply without electrolytic capacitor | |
| CN202565513U (en) | Built-in drive power of light-emitting diode (LED) fluorescent lamp | |
| CN205029936U (en) | LED lighting system that can regulate and control | |
| CN106787780A (en) | Intelligent half-bridge amendment wave voltage change-over circuit based on PFC Yu LLC resonance | |
| CN202488835U (en) | LED drive circuit | |
| CN206525000U (en) | Adaptive line voltage compensation LED drive circuit based on primary side feedback | |
| CN206698109U (en) | A kind of current sampling circuit and without bridge commutation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: The new plum village in Jiangsu province 214112 city Wuxi Qunxing Road No. 26 Patentee after: Wuxi Ampang electric Limited by Share Ltd Address before: The new plum village in Jiangsu province 214112 city Wuxi Qunxing Road No. 26 Patentee before: Anbang Electric Co., Ltd., Wuxi |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Low-impact-current high-power-factor energy storage type countdown display circuit Effective date of registration: 20170616 Granted publication date: 20151028 Pledgee: Bank of Jiangsu Limited by Share Ltd Wuxi New District sub branch Pledgor: Wuxi Ampang electric Limited by Share Ltd Registration number: 2017990000494 |