CN205946253U - LED drive and control circuit and controlling means - Google Patents

Abstract

The utility model discloses a LED drive and control circuit and controlling means, control circuit includes: angle of flow detection circuitry, constant current reference circuit, CS peak value detection circuitry, CS peak holding circuit, zero passage detection circuitry and control circuit, the break -make state of angle of flow detection circuitry through detecting the input voltage judgement silicon controlled rectifier after the rectification to output silicon controlled rectifier break -make status signal, the control circuit basis silicon controlled rectifier break -make status signal realizes the minimum of power factor school, positive constant current output and silicon controlled rectifier and maintains the switching of two kinds of control models of current control. The utility model discloses remove pure vacation nature load, reduced the energy consumption, high intelligentization, work efficiency is high, but the different silicon controlled rectifier of self -adaptation, compatible strong, arrival current is greater than the silicon controlled rectifier extinction current all the time, the flashing light phenomenon can not appear, the input of adaptable different high -low pressures, circuit design is ingenious, and the practicality is strong.

Description

A kind of LED drive control circuit and control device

Technical field

This utility model is related to LED illumination driving power source electronic technology field, and more particularly, to a kind of LED power controls electricity Road and the control device applying described drive control circuit.

Background technology

Current controllable silicon LED light adjusting circuit, because the device reason of controllable silicon itself, needs depositing of a maintenance electric current In ability constant conduction.So for light modulation LED power requirement, when small-power exports, or when dimming small-power, especially It is in high pressure（200-240VAC）When input small-power exports or dims to Small conduction angle, the electric current of input is less than controllable silicon and maintains Electric current, controllable silicon can enter off state, and now circuit can cause power input to interrupt because controllable silicon turns off, and flashing light occurs And restart phenomenon.

Solve this problem, have 3 kinds of solutions at present both at home and abroad to this problem：One is, adjusts phase by detecting controllable silicon Position little to certain angle when, control fictitious load incision bus to maintain electric current producing a silicon controlled；Two are, by control The assists winding of power supply is cut in one fictitious load of system or secondary windings produce certain consumption and produce silicon controlled and maintain electric current. Three are, low pressure input and high input voltage are separately debugged.But the core of these schemes is all the form by increasing extra fictitious load Meet and maintain electric current, the problem brought be power supply loss is very big, efficiency is very low；Different controllable silicons needs to adjust different vacations Load point of penetration, poor compatibility；Compatible high-low pressure can not input simultaneously, need separately debugging then bad adaptability.These do not meet Now and Energy Conservation in future and Based Intelligent Control needs.

Content of the invention

This utility model is to solve above-mentioned problems of the prior art, proposes a kind of LED drive control circuit and control Device processed.

The utility model proposes LED drive control circuit, including：Conducting angle detection circuit, after according to rectification Input voltage judges silicon controlled on off operating mode, and exports controllable silicon on off operating mode signal；Constant current reference circuit, can for receiving Control silicon on off operating mode signal, is adjusted and output current constant current reference signal；CS peak detection circuit, for receiving in main circuit Current sampling signal CS, exports the first current peak signal；CS peak holding circuit, for receiving the first current peak signal simultaneously Keep, export the second current peak signal；Zero cross detection circuit, for detecting the auxiliary winding voltage in main circuit, output electricity Sense time of afterflow signal and Valley-Switching signal；Control circuit, respectively with conducting angle detection circuit, constant current reference circuit, CS peak Value holding circuit connects with zero cross detection circuit, controls described peak detection circuit and CS peak according to controllable silicon on off operating mode signal Break-make between value holding circuit, and realize PFC constant current output and two kinds of silicon controlled extinction current control The switching of control model.

Wherein, described control circuit includes error amplifying circuit, first comparator, the second comparator, multiplier, signal Selection circuit, rest-set flip-flop and switch driving circuit, described CS peak holding circuit and described zero cross detection circuit respectively with institute State after multiplier connects and be connected with a low pass filter, described low pass filter and described constant current reference circuit are by described error Amplifying circuit is connected with an input of first comparator, and another input of first comparator and a sawtooth generator are even Connect, be connected by a switch S1 between described CS peak detection circuit and described CS peak holding circuit, described CS peakvalue's checking Circuit is connected with two inputs of the second comparator respectively with the outfan of described CS peak holding circuit, and described first, After two comparators are connected with three inputs of described signal selecting circuit respectively with the outfan of described conducting angle detection circuit It is connected with an input of described rest-set flip-flop, another input of described rest-set flip-flop is with described zero cross detection circuit even Connect, the switch driving circuit that described rest-set flip-flop passes through a series connection is connected with main circuit, to main circuit output drive signal VG.

The utility model proposes the LED drive dynamic control device with described LED drive control circuit, including main circuit and LED drive control circuit, described main circuit includes rectifier bridge B1, input capacitance C1, sustained diode 1, transformator T1, work( Rate switching tube Q1, current detection circuit Rsen, output capacitance Co and LED load, the input of described LED drive control circuit divides Jie Shou not current sampling signal CS, the assists winding electricity of the input voltage signal Vin after rectified bridge B1 rectification and transformator T1 Pressure, the outfan of described LED drive control circuit connects to the grid of power switch pipe Q1, provides it drive signal VG.

When described conducting angle detection circuit detects controllable silicon and opens, the controllable silicon on off operating mode letter that output one is opened Number, controlling switch S1 turns on, and CS peak holding circuit is persistently sampled and kept current peak signal, meanwhile, described signal behavior Circuit selects the first reset signal of described first comparator output as its output signal, and control circuit works in current constant control State, realizes PFC and constant current output function；

When conducting angle detection circuit detects controllable silicon and closes on shutoff, what conducting angle detection circuit output one turned off can Control silicon on off operating mode signal, controlling switch S1 turns off, and maintained switch S1 is turned off the current peak in moment by CS peak holding circuit Signal, synchronous signal selection circuit selects the second reset signal of described second comparator output as its output signal, controls Circuit works in peak value comparison method state, realizes silicon controlled extinction current and controls.

Described drive signal VG is pulse-width signal.

The beneficial effects of the utility model are：

1. eliminate special electric current holding circuit and its pure false load, it is to avoid produced by false load in circuit work Raw heat and energy consumption, are only controlled with a drive control circuit realiration constant current output PFC and extinction current Two kinds of control models, and need not be loaded down with trivial details the different fictitious load points of penetration of adjustment, more intelligent, substantially increase work effect Rate；

2. silicon controlled phase angle and peak point current detect and judge silicon controlled minimum current, drive circuit is by constant current jointly Mode smooth enters peak control mode, easily can carry out minimum current detection to different controllable silicons, and adaptability is strong, and Capacitive is high；

3. high-low pressure input need not separately be debugged change parameter and all can be used, strong adaptability；

4., when input current is down to controllable silicon extinction current, circuit will be immediately switched to extinction current control Mode of operation, makes input current raise, thus maintaining silicon controlled to work, input current is consistently greater than controllable silicon minimum maintenance electricity Stream, controllable silicon is not in shutoff phenomenon, and that is, LED there will not be flashing light to restart phenomenon；

5. circuit design is ingenious, practical.

Brief description

With reference to embodiment and accompanying drawing, this utility model is described in detail, wherein：

Fig. 1 is circuit connection diagram of the present utility model；

Fig. 2 is the circuit connection diagram of this utility model control device；

Fig. 3 is the working waveform figure of this utility model control device.

Specific embodiment

As shown in figure 1, the utility model proposes LED drive control circuit 100 include：Conducting angle detection circuit 101, perseverance Stream reference circuit 102, CS peak detection circuit 103, CS peak holding circuit 105, switch S1, zero cross detection circuit 109, first Comparator 107, the second comparator 104, error amplifier 106, multiplier 110, low pass filter 111, sawtooth generator 112nd, signal selecting circuit 108, rest-set flip-flop 113 and switch driving circuit 114, physical circuit annexation is：Described leads The input of current flow angle testing circuit 101 is connected with main circuit, receives the input voltage after main circuit rectification, and output divides three tunnels, One tunnel is connected with signal selecting circuit 108, and a road is connected with constant current reference circuit 102, and a road is connected with switch S1, and CS peak value is examined The input of slowdown monitoring circuit 103 is connected with main circuit, receives the current sampling signal CS of current detection circuit in main circuit, output point Two-way, is led up to switch S1 and is connected with the input of CS peak holding circuit 105, the homophase of a road and the second comparator 104 Input connects, and the output of CS peak holding circuit 105 divides two-way, and a road is connected with the inverting input of the second comparator 104, One tunnel is connected with multiplier 110, and the foot ZCD of zero cross detection circuit 109 is input and the main circuit company of zero cross detection circuit 109 Connect, receive the auxiliary winding voltage in main circuit, output point two-way, a road is connected with multiplier 110, outputting inductance time of afterflow Signal, a road is connected with the S end of rest-set flip-flop 113, and the outfan of multiplier 110 is put with error by a low pass filter 111 The inverting input of big device 106 connects, and the outfan of error amplifier 106 is connected with the in-phase input end of first comparator 107, The inverting input of first comparator 107 is connected with sawtooth generator 112, first comparator 107 and the second comparator 104 Outfan is all connected with signal selecting circuit 108, and the outfan of signal selecting circuit 108 is connected with the R end of rest-set flip-flop 113, The Q end of rest-set flip-flop is connected with switch driving circuit 114, and switch driving circuit 114 is to the drive of main circuit output switching tube Dynamic signal VG.

As shown in Fig. 2 the utility model proposes LED drive dynamic control device include described LED drive control circuit 100 With main circuit 200, main circuit 200 includes rectifier bridge B1, input capacitance C1, sustained diode 1, transformator T1, power switch pipe Q1, current detection circuit Rsen, output capacitance Co and LED load, rectifier bridge B1 and an alternating current power supply（Not shown）Parallel connection, with When, input capacitance C1, the armature winding T1A of transformator T1, output capacitance Co and LED load are all in parallel with described rectifier bridge B1, Described current detection circuit Rsen and described power switch pipe Q1 is connected on the armature winding T1A of input capacitance C1 and transformator T1 Connecting line between, described sustained diode 1 is connected on the armature winding T1A of transformator T1 in the connecting line of output capacitance Co Between, and its negative pole is connected with output capacitance Co, is also in series with first, second resistance between the positive pole of alternating current power supply and ground wire R1、R2；

The input of the conducting angle detection circuit 101 of described LED drive control circuit 100 is connected to the of main circuit 200 First, between the connecting line of second resistance R1, R2, receive rectified bridge B1 rectification after voltage, CS peak detection circuit 103 defeated Enter end to be connected with the outfan of the current detection circuit Rsen of main circuit 200, receive current sampling signal CS, zero cross detection circuit 109 are connected with assists winding T1B of transformator T1, receive assists winding T1B two ends voltage, switch driving circuit 114 defeated Go out the grid at end and power switch pipe Q1, described LED drive circuit 100 provides drive signal VG to power switch pipe Q1.

The operation principle stating LED drive dynamic control device is as follows：

After the alternating current power supply rectified bridge B1 rectification of main circuit 200, by voltage output to LED drive control circuit 100 Conducting angle detection circuit 101, input voltage after detecting rectification for the conducting angle detection circuit 101 judges silicon controlled triggering electricity Pressure, and silicon controlled on off operating mode is judged according to the value of currently detected input voltage, and export a controllable silicon on off operating mode Signal, detection constant current reference circuit 102 receives described controllable silicon on off operating mode signal, changes output current constant current benchmark, when defeated Enter voltage and become hour, described constant current benchmark step-down；

Zero cross detection circuit 109 detects the voltage of assists winding T1B of main circuit, generates inductance time of afterflow signal and paddy Bottom is opened signal and is exported, and the current peak signal of described Valley-Switching signal and CS peak holding circuit 105 is through multiplier 110 Exported to error amplifier 106 after low pass filter 111 filtering after multiplication, error amplifier 106 receives constant current base simultaneously The output signal of quasi- circuit 102, the sawtooth signal that the error amplification signal of generation is sent with sawtooth generator 112 passes through the One comparator 107 relatively exports the first reset signal afterwards to signal selecting circuit 108；

Described CS peak detection circuit 103 receives the current sampling signal CS of the current detection circuit Rsen of main circuit 200, Real-time sampling simultaneously exports the first current peak signal, and CS peak detection circuit 103 passes through one with described CS peak holding circuit 105 Switch S1 connects, and CS peak holding circuit 105 passes through to switch the first current peak signal that S1 receives CS peak detection circuit 103 And keep, export the second current peak signal, switch S1 receives described controllable silicon break-make control signal, controls its conducting or closes Disconnected, the first current peak signal exports the second reset signal extremely after comparing through the second comparator 104 with the second current peak signal Signal selecting circuit 108；

The controllable silicon on off operating mode signal that the conducting angle detection circuit 101 that signal selecting circuit 108 passes through to receive exports, To select to export corresponding reset signal to rest-set flip-flop 113, rest-set flip-flop 113 receives zero cross detection circuit 109 simultaneously and exports Inductance time of afterflow signal, export a switch controlling signal, described switch controlling signal produced by switch driving circuit 114 A raw drive signal VG, described drive signal VG exports the grid of the power switch pipe Q1 to main circuit, thus realizing power Factor correcting, constant current output function, and the switching of silicon controlled extinction current two kinds of control models of control.

When conducting angle detection circuit 101 detects controllable silicon and opens, conducting angle detection circuit 101 exports one and opens shape The controllable silicon on off operating mode signal of state, controls electrical switch S1 conducting, makes CS peak detection circuit 103 and CS peak holding circuit 105 conductings connect, and now, CS peak holding circuit 105 is persistently sampled and kept current peak signal, meanwhile, signal behavior electricity Road 108 using according to controllable silicon on off operating mode signal behavior first reset signal of opening state receiving as output signal, This timed unit works in current constant control state, realizes constant current output and power factor emendation function.

When conducting angle detection circuit 101 detects controllable silicon and closes on shutoff, conducting angle detection circuit 101 exports one and faces The controllable silicon on off operating mode signal of nearly off state, constant current benchmark is turned down by constant current reference circuit 102, and electrical switch S1 turns off, CS peak detection circuit 103 is disconnected with CS peak holding circuit 105, and maintained switch S1 is closed by CS peak holding circuit 105 The current peak signal in disconnected moment, meanwhile, the controllable silicon break-make shape of the off state that basis is received by signal selecting circuit 108 As output signal, this timed unit works in peak value comparison method state to state signal behavior second reset signal, and realization can The extinction current of control silicon controls.

The drive signal VG acting on power switch pipe Q1 of switch driving circuit 114 output is PWM（Pulsewidth modulation）Letter Number, reach the effect maintaining curent change by the dutycycle adjusting drive signal VG, dutycycle is bigger to maintain electric current bigger.

Fig. 3 is the work wave of the present embodiment LED drive dynamic control device, and Vac is the alternating voltage of input, and Vin is rectification Input voltage afterwards, Vref is the magnitude of voltage of output current constant current benchmark, and IL is LED load electric current, and Iin is input current, when When input voltage is less than constant current benchmark, the constant current mode that circuit controls from constant turn-on time, switch to Peak Current-Mode Controlled Circuit, Input current Iin begins to ramp up, and by circuit control, makes input current Iin be consistently greater than silicon controlled and maintains electric current.

This utility model eliminates special electric current holding circuit and its pure false load, it is to avoid by vacation in circuit work Property the heat that produces of load and energy consumption, only use a drive control circuit realiration constant current output PFC and minimum maintenance Two kinds of control models of current control, and need not be loaded down with trivial details the different fictitious load points of penetration of adjustment, more intelligent, substantially increase Work efficiency；Silicon controlled phase angle and peak point current detect and judge silicon controlled minimum current, drive circuit is by constant current jointly Mode smooth enters peak control mode, easily can carry out minimum current detection to different controllable silicons, and adaptability is strong, and Capacitive is high；When input current is down to controllable silicon extinction current, circuit will be immediately switched to extinction current and control work Operation mode, makes input current raise, thus maintaining silicon controlled to work, input current is consistently greater than controllable silicon minimum maintenance electricity Stream, controllable silicon is not in shutoff phenomenon, and that is, LED there will not be flashing light to restart phenomenon；High-low pressure input need not change ginseng Number all can use, very convenient；Circuit design is ingenious, practical.

The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all this Any modification, equivalent and improvement made within the spirit of utility model and principle etc., should be included in this utility model Protection domain within.

Claims (6)

1. a kind of LED drive control circuit is it is characterised in that include：Conducting angle detection circuit（101）, after according to rectification Input voltage judge silicon controlled on off operating mode, and export controllable silicon on off operating mode signal；Constant current reference circuit（102）, use In receiving controllable silicon on off operating mode signal, adjust and output current constant current reference signal；CS peak detection circuit（103）, it is used for Receive the current sampling signal CS in main circuit, export the first current peak signal；CS peak holding circuit（105）, it is used for connecing Receive the first current peak signal and keep, export the second current peak signal；Zero cross detection circuit（109）, for detecting main electricity Auxiliary winding voltage in road, outputting inductance time of afterflow signal and Valley-Switching signal；Control circuit, is examined with the angle of flow respectively Slowdown monitoring circuit, constant current reference circuit, CS peak holding circuit connect with zero cross detection circuit, according to controllable silicon on off operating mode signal control Make the break-make between described peak detection circuit and CS peak holding circuit, and realize PFC constant current output and controlled The extinction current of silicon controls the switching of two kinds of control models.

2. LED drive control circuit as claimed in claim 1 is it is characterised in that described control circuit includes error amplification Circuit（106）, first comparator（107）, the second comparator（104）, multiplier（110）, signal selecting circuit（108）, RS touch Send out device（113）And switch driving circuit（114）, described CS peak holding circuit and described zero cross detection circuit are taken advantage of with described respectively With a low pass filter after musical instruments used in a Buddhist or Taoist mass connection（111）Connect, described low pass filter and described constant current reference circuit are by described mistake Difference amplifying circuit is connected with an input of first comparator, another input of first comparator and a sawtooth generator （112）Connect, be connected by a switch S1 between described CS peak detection circuit and described CS peak holding circuit, described CS peak Value testing circuit is connected with two inputs of the second comparator respectively with the outfan of described CS peak holding circuit, and described the First, the outfan of the second comparator and described conducting angle detection circuit three input phases with described signal selecting circuit respectively One input connection, another input of described rest-set flip-flop and the described zero cross detection circuit of rest-set flip-flop described in Lian Houyu Connect, the switch driving circuit that described rest-set flip-flop passes through a series connection is connected with main circuit, to main circuit output drive signal VG.

3. LED drive control circuit as claimed in claim 2 is it is characterised in that described drive signal VG is pulsewidth modulation Signal.

4. a kind of LED drive dynamic control device of the LED drive control circuit having described in claim 2 is it is characterised in that include Main circuit（200）With LED drive control circuit（100）, described main circuit includes rectifier bridge B1, input capacitance C1, afterflow two Pole pipe D1, transformator T1, power switch pipe Q1, current detection circuit Rsen, output capacitance Co and LED load, described LED drives Control circuit（100）Input receive current sampling signal CS, the input voltage signal Vin after rectified bridge B1 rectification respectively With the auxiliary winding voltage of transformator T1, described LED drive control circuit（100）Outfan connect to power switch pipe Q1's Grid, provides it drive signal VG.

5. LED drive dynamic control device as claimed in claim 4 it is characterised in that：

When described conducting angle detection circuit detects controllable silicon and opens, export a controllable silicon on off operating mode signal opened, Controlling switch S1 turns on, and CS peak holding circuit is persistently sampled and kept current peak signal, meanwhile, described signal selecting circuit As its output signal, control circuit works in current constant control shape to the first reset signal selecting described first comparator output State, realizes PFC and constant current output function；

When conducting angle detection circuit detects controllable silicon and closes on shutoff, conducting angle detection circuit exports the controllable silicon of a shutoff On off operating mode signal, controlling switch S1 turns off, and maintained switch S1 is turned off the current peak signal in moment by CS peak holding circuit, Synchronous signal selection circuit selects the second reset signal of described second comparator output as its output signal, control circuit work Make in peak value comparison method state, realize silicon controlled extinction current and control.

6. LED drive dynamic control device as claimed in claim 4 is it is characterised in that described drive signal VG is pulsewidth modulation Signal.