CN207884926U - A kind of LED drive signal control circuit - Google Patents

Abstract

The utility model discloses a kind of LED drive signal control circuits, circuit is absorbed with zero phase with power supply by second voltage output end and is connected in one end, there are two control signal outputs for its output end tool, first control signal output end is connected with the first controlled constant current circuit, and second control signal output end is connected with the second controlled constant current circuit.A kind of LED drive signal control circuit provided by the utility model, can improve the power factor of LED lamp, improve the service life of LED light and can effectively reduce the temperature of LED light.

Description

A kind of LED drive signal control circuit

Technical field

The utility model is related to a kind of LED light control circuits, and in particular to a kind of LED drive signal control circuit.

Background technology

In LED lamp, performance, the quality of LED drivings are extremely important to pass, the adaptation ability of voltage, especially medium and small The LED lamp of power had both required low cost, price excellent, had also been proposed many technology requirements.LED lamp is by lamp bead (light source), drive Dynamic and shell three parts composition, wherein determining that quality, the quality of performance of LED lamp depend primarily on LED drivings.Outside by lamps and lanterns The limitation of shell size, it is necessary to using the driving small, stability is high.The driving of the LED lamp of middle low power has resistance-capacitance depressurization Formula, isolation constant current mode, non-isolated constant current mode etc..Capacitance-resistance step down type driving structure is simple, long lifespan, low cost, power factor are low In 0.5, power is big with input voltage fluctuation；Isolation constant current mode, the driving of non-isolated constant current mode are currently mainstream, but of high cost, Performance quality is closely related with circuit structure, and power factor is less than 0.7, and High Power Factor needs increase cost.

In recent years, the LED lamp of middle low power has the following problems：A, optical attenuation is serious；B, temperature is too high, filament lamp glass Glass case temperature is up to 110 DEG C, and the temperature of internal LED filament is more than 130 DEG C, and optical attenuation is big；C, driving is easily damaged.

Utility model content

The utility model is that optical attenuation is serious in use, temperature is excessively high for LED lamp in the prior art in order to overcome With drive the problems such as fragile, a kind of LED drive signal control circuit is provided, can effectively improve the power of LED lamp because Number, improves the service life of LED light and can effectively reduce the temperature of LED light.

The utility model provides a kind of LED drive signal control circuit, including：

Control signal generating circuit：One end absorbs circuit with zero phase with power supply by second voltage output end and is connected, There are two control signal output, first control signal output end is connected output end tool with the first controlled constant current circuit, the second control Signal output end processed is connected with the second controlled constant current circuit, for controlling the first controlled constant current circuit and the second controlled constant current circuit Working condition.

A kind of LED lamp controlled constant current circuit described in the utility model, it is preferred that, power supply is absorbed with zero phase Circuit includes fuse, the first voltage-stablizer, the first rectifier bridge, the second rectifier bridge, the first diode, the second diode, the one or three Pole pipe, the first capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance, the 6th capacitance, the 7th capacitance, the 8th capacitance, Tenth capacitance, dropping resistor, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th Resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, twelfth resistor, the 27th resistance, the 28th electricity Resistance；Dropping resistor one end is connected by fuse with firewire, and the other end is connected with the anode of the first diode；First diode Anode is connected by the first capacitance and first resistor being arranged in parallel with the ac input end of the first rectifier bridge, the first diode Anode exchanges input by the second capacitance, second resistance, third capacitance and the 3rd resistor that are arranged in parallel and the second rectifier bridge End is connected, and the cathode of the first diode is connected by the 4th resistance with the base stage of the first triode；The base stage of first triode is logical The 5th resistance eutral grounding is crossed, the emitter ground connection of the first triode, the collector of the first triode and the 6th resistance and zero phase are defeated Exit port is connected；The output head anode of second rectifier bridge is connected with LED lamp, and the output head anode of the second rectifier bridge passes through the 4th The negative pole of output end of capacity earth, the first rectifier bridge and the second rectifier bridge is grounded, the output head anode of the first rectifier bridge with it is in parallel The 27th resistance being arranged and the 28th resistance are connected；The 27th resistance of parallel resistance and the 28th resistance it is another End is connected with the power input of the first controlled constant current circuit and the first voltage-stablizer, the power input of the first voltage-stablizer and second One end of the cathode of diode, the 5th capacitance and the 6th capacitance is connected, anode and the 5th capacitance and the 6th electricity of the second diode The other end of appearance is connected；The power output end of first voltage-stablizer is by the 7th capacitance being arranged in parallel and the 8th capacity earth, and The power output end of one voltage-stablizer passes through the 7th resistance that is arranged in series, the 8th resistance, the 9th resistance, the tenth resistance, the 11st Resistance and twelfth resistor ground connection；Tenth capacitance, eleventh resistor and twelfth resistor are connected with the second controlled constant current circuit.

A kind of LED lamp controlled constant current circuit described in the utility model, it is preferred that, fuse is fast molten insurance Silk；Second diode is zener diode；First triode is NPN type；4th capacitance, the 6th capacitance, the 8th capacitance are to have pole Property capacitance.

A kind of LED lamp controlled constant current circuit described in the utility model, it is preferred that, control signal generating circuit Including the second voltage-stablizer, the 9th capacitance, the 14th capacitance, the 29th resistance, the 30th resistance；Second voltage-stablizer is equipped with 8 Port, wherein No. 1 port and No. 8 ports and the 9th capacitance are connected, No. 2 ports are connected with zero phase output port, No. 3 ports It is grounded with after No. 4 port parallel connections, No. 5 ports are connected with the second controlled constant current circuit, No. 6 ports and the first controlled constant current circuit phase Even, No. 7 ports are connected with the 14th capacitance, the 29th resistance and the 30th resistance.

A kind of LED lamp controlled constant current circuit described in the utility model, it is preferred that, the first controlled constant current circuit Including the first operational amplifier, the second triode, the first field-effect tube, the 11st capacitance, the 12nd capacitance, thirteenth resistor, 14th resistance, the 15th resistance, the 16th resistance, the 17th resistance, the 18th resistance, the 19th resistance, the 31st electricity Resistance；The in-phase input end of first operational amplifier is connected with tertiary voltage output end, the inverting input of the first operational amplifier Be connected with the 12nd capacitance and the 18th resistance, the output end of the first operational amplifier and the 16th resistance, the 17th resistance and 19th resistance is connected, and the 19th resistance is connected with the 12nd capacitance, positive supply and the negative supply difference of the first operational amplifier It is connected in the both ends of the 11st capacitance；The collector phase of the poles G and the 16th resistance and the second triode of first field-effect tube Even, the poles S of the first field-effect tube are connected with the 14th resistance, the 15th resistance and the 18th resistance；First control signal inputs End is connected with thirteenth resistor and the 31st resistance, and the other end of thirteenth resistor is connected with the base stage of the second triode.

A kind of LED lamp controlled constant current circuit described in the utility model, it is preferred that, the second controlled constant current circuit Including second operational amplifier, third transistor, the second field-effect tube, the 13rd capacitance, the 20th resistance, the 21st electricity Resistance, the 22nd resistance, the 23rd resistance, the 24th resistance, the 25th resistance, the 26th resistance, the 32nd Resistance；The in-phase input end of second operational amplifier is connected with the 4th voltage output end, the anti-phase input of second operational amplifier End is connected with the 13rd capacitance and the 25th resistance, the output end of second operational amplifier and the 23rd resistance, the 20th Four resistance and the 26th resistance are connected, and the 26th resistance is connected with the 13rd capacitance；The poles G and second of second field-effect tube 13 resistance are connected with the collector of third transistor, the poles S and the 21st resistance, the 22nd resistance of the second field-effect tube It is connected with the 25th resistance；Second control signal input terminal is connected with the 20th resistance and the 32nd resistance, the 20th electricity The other end of resistance is connected with the base stage of third transistor.

The utility model can reach following technique effect：

1) signal of circuit is formed by zero phase, controls LED operation current phase so that the phase of LED operation electric current connects It is bordering on input voltage phase, ensure that power factor (PF values) is more than 0.9.

2) using subitem control mode, will not increasing for LED junction temperature is ensure that, thus it is possible to reduce by 30% or so LED Junction temperature temperature.

3) multichannel light phase superimposing technique is used, LED light flux and light efficiency are improved.

Description of the drawings

Fig. 1 is a kind of RC circuit diagrams for improving LED lamp power factor；

Fig. 2 is a kind of RC circuit composition figures for improving LED lamp power factor；

Fig. 3 is a kind of RC circuit power and zero phase intake circuit composition figure for improving LED lamp power factor；

Fig. 4 is a kind of RC circuit control signal generation circuit composition figures for improving LED lamp power factor；

Fig. 5 is a kind of RC circuits the first controlled constant current circuit composition figure for improving LED lamp power factor；

Fig. 6 is a kind of RC circuits the second controlled constant current circuit composition figure for improving LED lamp power factor；

Fig. 7 is a kind of RC circuit power and zero phase intake circuit output waveform for improving LED lamp power factor With zero phase relational graph；

Fig. 8 is a kind of RC circuit control signal generation circuit work waves extension for improving LED lamp power factor Figure.

Reference numeral：

1, power supply and zero phase absorb circuit；11, first voltage output end；12, second voltage output end；13, third electricity Press output end；14, the 4th voltage output end；2, signal generating circuit is controlled；21, first control signal output end；22, the second control Signal output end processed；3, the first controlled constant current circuit；31, first voltage output end；32, first control signal input terminal；4, Two controlled constant current circuits composition figure；41, second voltage output end；42, second control signal input terminal；5, LED lamp.

Specific implementation mode

Embodiment 1

As shown in Fig. 1~2, the utility model provides a kind of LED drive signal control circuit, it is characterised in that：Including：

Power supply absorbs circuit 1 with zero phase：With LED lamp 5, the first controlled constant current circuit 3, control signal generating circuit 2 It is connected with the second controlled constant current circuit 4, there are four voltage output ends for tool；Wherein first voltage output end 11 is used to be LED lamp 5 Voltage is provided, second voltage output end 12 provides voltage with signal generating circuit 2 in order to control, and tertiary voltage output end 13 is used for Voltage is provided for the first controlled constant current circuit 3, the 4th voltage output end 14 is used to provide voltage for the second controlled constant current circuit 4.

Power supply and zero phase absorb the circuit diagram of circuit 1 as shown in figure 3, the one end R0 is connected by F1 with firewire, the other end It is connected with the anode of D3；The anode of D3 is connected by the C1 and R1 that are arranged in parallel with the ac input end of D1, and the anode of D3 passes through C1, R1, C3 and the R3 being arranged in parallel are connected with the ac input end of D2, and the cathode of D3 is connected by R4 with the base stage of Q5；Q5's Base stage is grounded by R5, and the emitter ground connection of Q5, the collector of Q5 is connected with R6 and zero phase output port；The output of D2 is rectified Pole is connected with LED lamp 5, and the output head anode of D2 is grounded by C4, and the negative pole of output end ground connection of D1 and D2, the output of D1 are rectified Pole is connected with the R27 and R28 being arranged in parallel；The other end of parallel resistance R27 and R28 and the first controlled constant current circuit 3 and U1 Power input is connected, and the power input of U1 is connected with one end of the cathode of D4, C5 and C6, and the anode of D4 is with C5's and C6 The other end is connected；The power output end of U1 is grounded by the C7 and C8 being arranged in parallel, and the power output end of U1 is by being arranged in series R7~R12 ground connection；C10, R11 and R12 are connected with the second controlled constant current circuit 4.

Control signal generating circuit 2：One end 1 phase of circuit is absorbed by second voltage output end 12 and power supply and zero phase Even, there are two control signal output, first control signal output end 21 and 3 phases of the first controlled constant current circuit for output end tool Even, second control signal output end 22 is connected with the second controlled constant current circuit 4, is used for the first controlled constant current circuit 3 of control and the The working condition of two controlled constant current circuits 4.

The circuit diagram of signal generating circuit 2 is controlled as shown in figure 4, U2 is equipped with 8 ports, wherein No. 1 port and No. 8 ends Mouthful be connected with C9, No. 2 ports are connected with zero phase output port, be grounded after No. 3 ports and No. 4 port parallel connections, No. 5 ports and Second controlled constant current circuit 4 is connected, and No. 6 ports are connected with the first controlled constant current circuit 3, No. 7 ports and C14, R29 and R30 phase Even.

First controlled constant current circuit 3：First voltage input terminal 31 passes through the first voltage output end 11 and power supply and zero Phase absorbs circuit 1 and is connected, and first control signal input terminal 32 is generated by the first signal control output end 21 and control signal Circuit 2 is connected, and the output end of the first controlled constant current circuit 3 is connected with LED lamp 5, the luminous shape for controlling LED lamp 5 State.

The circuit diagram of first controlled constant current circuit 3 as shown in figure 5, U3A in-phase input end and tertiary voltage output end 13 It is connected, the inverting input of U3A is connected with C12 and R18, and the output end of U3A is connected with R16, R17 and R19, R19 and C12 phases Even, the positive supply of U3A is connected with negative supply respectively at the both ends of C11；The poles G of Q1 are connected with the collector of R16 and Q3, the S of Q1 Pole is connected with R14, R15 and R18；First control signal input terminal 32 is connected with R13 and R31, R13) the other end and Q3 base Extremely it is connected.

Second controlled constant current circuit 4：Second voltage input terminal 41 passes through second voltage output end 12 and power supply and zero phase It absorbs circuit 1 to be connected, second control signal input terminal 42 passes through second signal control output end 22 and control signal generating circuit 2 It is connected, the output end of the second controlled constant current circuit 4 is connected with LED lamp 5, the luminance for controlling LED lamp 5；

The circuit diagram of second controlled constant current circuit 4 is as shown in fig. 6, the in-phase input end of U3B and the 4th voltage output end 14 It is connected, the inverting input of U3B is connected with C12 and R25, and the output end of U3B is connected with R23, R24 and R26, R26 and C13 phases Even；The poles G of Q2 are connected with the collector of R23 and Q4, and the poles S of Q2 are connected with R21, R22 and R25；Second control signal input terminal 42 are connected with R20 and R32, and the other end of R20 is connected with the base stage of Q4.

LED lamp (5)：The LED light being arranged in parallel by two groups forms, and circuit is absorbed in one end with the power supply and zero phase (1) be connected, the other end of one of which LED light is connected with the first controlled constant current circuit (3), another group of LED light it is another End is connected with the second controlled constant current circuit (4).

The present embodiment in use, includes the following steps：

The formation of S1, power supply and zero phase intake circuit zero phase：Power on rear power supply and passes through F1, R0, D3, R4, R5 The positive half cycle of the alternating current of 50Hz is added between the base stage and emitter of triode Q5, is changed with the amplitude of alternating current, Transistor collector produces the zero phase pulse with the alternating current same-phase of input, as shown in Figure 4；

The first via RC step-down rectifying circuits that S2, power supply are formed via F1, R0, C1, R1, D1 form first via direct current, It is depressured current limliting through R27, R28, by D4 voltage stabilizings, is filtered through C5, C6, obtains the VCC burning voltages of 12V, is the first controlled constant current electricity Road provides voltage；12V voltages obtain the vdd voltage of stable 5V through U1 voltage stabilizings, C7, C8 filtering, and signal generates electricity in order to control Road provides voltage；5V voltages R7,8R, 9R, R10, R11, R12 partial pressure, obtains the constant current reference voltage of 500mV, is second controlled Constant-current circuit provides voltage；

S3, the another way power supply through F1, R0 generate VOUT voltages, are by C2, C3, R2, R3 resistance-capacitance depressurization, D2 rectifications LED light provides voltage；Wherein C2, C3 can be adjusted according to the requirement of LED light source powers and electric current；C2, C3 are using electrodeless Property capacitance, do not have to high-voltage electrolytic capacitor, safety patch capacitor, therefore small, long lifespan, reliability can also be used to increase；

S4, control signal generating circuit：Zero phase signal ZC is by the job initiation state of P02 input controls U2, output end The control signal of M1_CTRL and M2_CTRL is controlled by ZC signals, under the control of ZC signals, can effectively change LED in pulse Inverse peak voltage when work and negative peak electric current, protect LED not breakdown；AN0, AN1 export M1_CTRL and M2_CTRL signals, such as Shown in Fig. 5, working frequency when LED is lighted is that 1000Hz is divided into it three groups of work in the time of every 1ms, and phase is 120 °, the first via and second group of working time are 600us, and third group is not involved in work, and then the first via and the second road are equal Work and pulse condition, duty ratio very little, third road are not added with artificial work, ensure that the gap of the first via and the second paths of LEDs Time, so will not increasing for LED junction temperature is ensure that, thus it is possible to reduce by 30% or so LED junction temperature temperature；

S5, C14, R29, R30 constitute dimming input circuit, and the 0~10V analog voltages or pwm signal of light modulation are by the ends AN4 Input controls the output amplitude of M1_CTRL and M2_CTRL, achievees the purpose that light modulation；

S6, the first controlled constant current circuit receive M1_CTRL signals, control the luminance of first group of LED；Second control constant current Circuit receives M2_CTRL signals, controls the luminance of second group of LED.

Illustrate to be merely exemplary for the utility model, and not restrictive, those of ordinary skill in the art understand, In the case where not departing from spirit and scope defined by claim, any modification, variation or the equivalents that can make are all It will fall within the protection domain of utility model.

Claims (4)

1. a kind of LED drive signal control circuit, it is characterised in that：Including：

Signal generating circuit (2) is controlled, one end absorbs circuit (1) by second voltage output end (12) and power supply with zero phase It is connected, there are two control signal output, first control signal output end (21) and the first controlled constant current circuits for output end tool (3) it is connected, second control signal output end (22) is connected with the second controlled constant current circuit (4), for controlling the first controlled constant current The working condition of circuit (3) and the second controlled constant current circuit (4)；

The output end of the first controlled constant current circuit (3) is connected with LED lamp (5), for controlling shining for LED lamp (5) State；

The output end of the second controlled constant current circuit (4) is connected with LED lamp (5), for controlling shining for LED lamp (5) State；

LED lamp (5)：The LED light being arranged in parallel by two groups forms, and circuit (1) phase is absorbed in one end with the power supply and zero phase Even, the other end of one of which LED light is connected with the first controlled constant current circuit (3), the other end of another group of LED light and institute The second controlled constant current circuit (4) is stated to be connected.

2. a kind of LED drive signal control circuit according to claim 1, it is characterised in that：It further include the second voltage-stablizer (U2), the 9th capacitance (C9), the 14th capacitance (C14), the 29th resistance (R29), the 30th resistance (R30)；Described second Voltage-stablizer (U2) is equipped with 8 ports, wherein No. 1 port and No. 8 ports and the 9th capacitance (C9's) is connected, No. 2 ports and Zero phase output port is connected, and is grounded after No. 3 ports and No. 4 port parallel connections, No. 5 ports and the second controlled constant current circuit (4) it is connected, No. 6 ports are connected with the first controlled constant current circuit (3), No. 7 ports and the 14th capacitance (C14), institute The 29th resistance (R29) is stated with the 30th resistance (R30) to be connected.

3. a kind of LED drive signal control circuit according to claim 1, it is characterised in that：First controlled constant current Circuit (3) includes the first operational amplifier (U3A), the second triode (Q3), the first field-effect tube (Q1), the 11st capacitance (C11), the 12nd capacitance (C12), thirteenth resistor (R13), the 14th resistance (R14), the 15th resistance (R15), the 16th Resistance (R16), the 17th resistance (R17), the 18th resistance (R18), the 19th resistance (R19), the 31st resistance (R31)； The in-phase input end of first operational amplifier (U3A) is connected with tertiary voltage output end (13), first operation amplifier The inverting input of device (U3A) is connected with the 12nd capacitance (C12) and the 18th resistance (R18), first fortune Calculate the output end and the 16th resistance (R16), the 17th resistance (R17) and the 19th electricity of amplifier (U3A) It hinders (R19) to be connected, the 19th resistance (R19) is connected with the 12nd capacitance (C12), first operational amplifier (U3A) positive supply is connected with negative supply respectively at the both ends of the 11st capacitance (C11)；First field-effect tube (Q1) The poles G be connected with the collector of the 16th resistance (R16) and second triode (Q3), first field-effect tube (Q1) the poles S are connected with the 14th resistance (R14), the 15th resistance (R15) and the 18th resistance (R18)； First control signal input terminal (32) is connected with the thirteenth resistor (R13) and the 31st resistance (R31), and described The other end of 13 resistance (R13) is connected with the base stage of second triode (Q3).

4. a kind of LED drive signal control circuit according to claim 1, it is characterised in that：Second controlled constant current Circuit (4) includes second operational amplifier (U3B), third transistor (Q4), the second field-effect tube (Q2), the 13rd capacitance (C13), the 20th resistance (R20), the 21st resistance (R21), the 22nd resistance (R22), the 23rd resistance (R23), 24th resistance (R24), the 25th resistance (R25), the 26th resistance (R26), the 32nd resistance (R32)；It is described The in-phase input end of second operational amplifier (U3B) is connected with the 4th voltage output end (14), the second operational amplifier (U3B) inverting input is connected with the 13rd capacitance (C12) and the 25th resistance (R25), second fortune Calculate output end and the 23rd resistance (R23), the 24th resistance (R24) and described second of amplifier (U3B) 16 resistance (R26) are connected, and the 26th resistance (R26) is connected with the 13rd capacitance (C13)；Second effect The poles G that (Q2) should be managed are connected with the collector of the 23rd resistance (R23) and the third transistor (Q4), and described second The poles S of field-effect tube (Q2) and the 21st resistance (R21), the 22nd resistance (R22) and the described 25th Resistance (R25) is connected；Second control signal input terminal (42) and the 20th resistance (R20) and the 32nd resistance (R32) it is connected, the other end of the 20th resistance (R20) is connected with the base stage of the third transistor (Q4).