CN201369862Y - LED constant current driver - Google Patents
LED constant current driver Download PDFInfo
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- CN201369862Y CN201369862Y CNU2009201056418U CN200920105641U CN201369862Y CN 201369862 Y CN201369862 Y CN 201369862Y CN U2009201056418 U CNU2009201056418 U CN U2009201056418U CN 200920105641 U CN200920105641 U CN 200920105641U CN 201369862 Y CN201369862 Y CN 201369862Y
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Abstract
The utility model discloses a LED constant current driver which comprises a constant current drive circuit and a detection protection circuit; the constant current drive circuit converts input ac current into constant dc current and outputs the dc current to a LED load; the detection protection circuit is connected with both ends of the LED load in parallel for detecting the change of output end voltage; when short-circuit, open-circuit or reverse connection situation occurs in output end, the output end voltage has over low or over high exception value accordingly; then, the detection protection circuit sends a control signal to the constant current drive circuit to cut off the constant current drive circuit. The LED constant current driver can be adopted to stop operating when load LED is in exceptional operation state, the use safety of constant current driver and load LED are guaranteed.
Description
Technical field
The utility model relates to the power circuit field, particularly a kind of light-emitting diode (light-emittingdiode, LED) constant-flow driver.
Background technology
At present, along with the development of LED technology, LED products such as LED large-screen, LED light, LED flood light, LED street lamp arise at the historic moment; Because characteristics such as LED have that power consumption is low, long service life, high brightness, controllability are strong, LED is widely used in lighting field.
Fig. 1 is the wiring schematic diagram of existing LED constant-flow driver, and when load LED operate as normal, the LED constant-flow driver is converted to constant DC stream with the AC power of input, exports load LED to; When load LED is in short circuit, open circuit, reversal connection or open circuit again during abnormal operating state such as connection, the voltage of output loading LED or electric current can be undergone mutation, and surge voltage or electric current that this moment, load end formed all can cause damage to LED constant-flow driver internal circuit and load LED.
The utility model content
In view of this, main purpose of the present utility model is to provide a kind of LED constant-flow driver, and this driver can be protected self internal circuit and load LED when load LED abnormal operating state.
For achieving the above object, the technical solution of the utility model specifically is achieved in that
A kind of LED constant-flow driver, this driver comprise constant-current drive circuit and detect protective circuit;
Described constant-current drive circuit becomes constant DC stream with the AC power of importing and exports the LED load to; When described detection protective circuit detects load LED open circuit or short circuit, send a control signal to described constant-current drive circuit, constant-current drive circuit is turn-offed.
In the above-mentioned driver, described constant-current drive circuit comprises current rectifying and wave filtering circuit, step-down type dc translation circuit, electronic switch, regenerative circuit, peak current negative feedback branch road, pulse-width modulation PWM control circuit and starts holding circuit;
Described current rectifying and wave filtering circuit becomes high direct voltage to export to described step-down type dc translation circuit the AC power rectifying and wave-filtering of input, and output is connected mutation voltage and electric current to described startup holding circuit;
The connection mutation voltage that described startup holding circuit is exported current rectifying and wave filtering circuit is converted to starting current and exports described pulse-width modulation PWM control circuit to, and, described pulse-width modulation PWM control circuit keeps electric current for providing, when load LED short circuit, described startup holding circuit receives the control signal of described detection protective circuit output and turn-offs, and stops output and keeps electric current to described pulse-width modulation PWM control circuit;
Be transformed to sawtooth current after the high direct voltage step-down of described step-down type dc translation circuit with input, and sawtooth current is filtered into direct current exports to load LED, the value of this direct current is 1/2nd of a sawtooth current peak value;
Described electronic switch is according to the starting current of described pulse-width modulation PWM control circuit output and conducting, and under the positive feedback effect of keeping electric current and described regenerative circuit of described pulse-width modulation PWM control circuit output, produce self-oscillation, be in periodic conducting and cut-off state, when described electronic switch conducting, described step-down type dc translation circuit exports sawtooth current to electronic switch, when the sawtooth current of the electronic switch of flowing through reaches the setting peak value, described peak current negative-feedback circuit output sampling value is to described pulse-width modulation PWM control circuit, and described pulse-width modulation PWM control circuit is controlled described electronic switch and ended;
The flow through current peak of described electronic switch of described peak current negative-feedback circuit sampling, and this sampling value fed back to described pulse-width modulation PWM control circuit;
When the sampling value of described peak current negative-feedback circuit changes, described pulse-width modulation PWM control circuit changes the pulse-width modulation PWM duty ratio that exports described electronic switch to by the ON time of the described electronic switch of control and the positive feedback effect of regenerative circuit; Described pulse-width modulation PWM duty ratio is the time of conducting in cycle of oscillation of described electronic switch and the ratio of cycle of oscillation, when load LED both end voltage occurs when unusual, receive the control signal of described detection protective circuit output, weaken the positive feedback effect of described regenerative circuit, described pulse-width modulation PWM control circuit is controlled described electronic switch and is ended; When load LED short circuit, described pulse-width modulation PWM control circuit is controlled described electronic switch and is ended according to the positive feedback effect that electric current weakens described regenerative circuit of keeping that receives described startup holding circuit output.
In the above-mentioned driver, described detection protective circuit comprises: an end (1) of resistance (R12), resistance (R13), resistance (R14), resistance (R15), resistance (R16), resistance (R17), resistance (R18) and photoelectrical coupler (P1), an end (2) of photoelectrical coupler (P1), photoelectrical coupler (P2), diode (VW2), diode (VW3), diode (VD6), controllable silicon (SCR);
Described resistance (R12) end connects an end of resistance (R13), and the other end connects the negative pole of diode (VW2); The other end of described resistance (R13) connects an end (T2) of controllable silicon (SCR); The positive pole of described diode (VW2) connects an end (1) of photoelectrical coupler (P1): an end (2) of photoelectrical coupler (P1) connects an end (T1) of controllable silicon (SCR); One end (G) of described controllable silicon (SCR) is connected with the positive pole of diode (VW3); The negative pole of described diode (VW3) connects an end of resistance (R16); The other end of described resistance (R16) connects an end of resistance (R15), and connects an end (T1) of controllable silicon (SCR); The other end of described resistance (R15) connects the positive pole of diode (VW3); The negative pole of the cathode connecting diode (VW2) of described diode (VD6), the negative pole of diode (VD6) connects an end (T2) of controllable silicon (SCR); One end (1) the connection resistance (R12) of described photoelectrical coupler (P2) and an end that is connected of resistance (R13), one end (2) of photoelectrical coupler (P2) connects an end of resistance (R14), one end (3) of photoelectrical coupler connects described pulse-width modulation PWM control circuit and peak current negative-feedback circuit, and an end (4) of photoelectrical coupler (P2) connects described electronic switch, described startup holding circuit, described regenerative circuit and described pulse-width modulation PWM control circuit; The other end of described resistance (R14) connects an end (T2) of controllable silicon (SCR); One end of described resistance (R17) connects an end (1) of photoelectrical coupler (P2), and connects the positive pole of load LED, and the other end connects the negative pole of diode (VW3); One end of described resistance (R18) connects an end (1) of photoelectrical coupler (P2), and connects the positive pole of load LED, and the other end connects the negative pole of diode (VW3); Described resistance (R12) is connected described step-down type dc translation circuit with an end (2) of the link of resistance (R13), described photoelectrical coupler (P1).
In the above-mentioned driver, described current rectifying and wave filtering circuit comprises: fusing resistor (R0), resistance (Rt), single phase bridge type rectifier circu (VD1-VD4), electric capacity (C1) and resistance (R1), resistance (R2);
One end of one end (4) connecting resistance (Rt) of described single phase bridge type rectifier circu (VD1-VD4), the other end connecting to neutral line of resistance (Rt); One end (2) of described single phase bridge type rectifier circu (VD1-VD4) connects an end of fusing resistor (R0), the other end of fusing resistor (R0) line of starting to exchange fire; One end (1) of described single phase bridge type rectifier circu (VD1-VD4) connects the positive pole of electric capacity (C1), the minus earth line of electric capacity (C1); One end (3) earth connection of described single phase bridge type rectifier circu (VD1-VD4); Resistance (R1) end connects the positive pole of electric capacity (C1), and connects an end (1) of the photoelectrical coupler (P2) of described detection protective circuit, and the other end of resistance (R1) connects an end of resistance (R2), and connects described startup holding circuit; The other end of resistance (R2) is connected with ground wire; The positive pole of described electric capacity (C1) connects described step-down type dc translation circuit, and connects described startup holding circuit.
In the above-mentioned driver, described step-down type dc translation circuit comprises diode (VD5), electric capacity (C5) and inductance (L);
The positive pole of described diode (VD5) connects an end of inductance (L), and connects described electronic switch, described regenerative circuit, and the negative pole of diode (VD5) connects the positive pole of the electric capacity (C1) of described current rectifying and wave filtering circuit; The other end of described inductance (L) connects the negative pole of electric capacity (C5), and connects an end (2) of described detection protective circuit photoelectrical coupler (P1); The positive pole of described electric capacity (C5) connects the negative pole of described diode (VD5), and connects the link of described detection protective circuit resistance (R12) and resistance (R13).
In the above-mentioned driver, described electronic switch is a V-type metal oxide semiconductor field-effect VMOS pipe;
The source electrode (S) of described V-type metal oxide semiconductor field-effect VMOS pipe connects described peak current negative-feedback circuit; The grid (G) of described V-type metal oxide semiconductor field-effect VMOS pipe connects an end (4) of the photoelectrical coupler (P2) of described detection protective circuit, and connects described startup holding circuit, described pulse-width modulation PWM control circuit and described regenerative circuit; The drain electrode (D) of described V-type metal oxide semiconductor field-effect VMOS pipe connects the positive pole of the diode (VD5) of described step-down type dc translation circuit, and connects described regenerative circuit.
In the above-mentioned driver, described peak current negative-feedback circuit comprises: resistance (R9), resistance (R10) and resistance (R11), described resistance (R9) end connects the source electrode (S) of the V-type metal oxide semiconductor field-effect VMOS pipe of electronic switch, and the other end connects ground wire; Described resistance (R10) is connected in parallel on described resistance (R9) two ends; One end of described resistance (R11) connects the source electrode (S) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch; the other end connects an end (3) of the photoelectrical coupler (P2) of described detection protective circuit, and connects described pulse-width modulation PWM control circuit.
In the above-mentioned driver, described regenerative circuit comprises high frequency transformer (TH), electric capacity (C4), electric capacity (C3) and resistance (R4);
Described high frequency transformer (TH) comprises primary winding (N1), secondary coil (N2);
The induction end of described high frequency transformer (TH) primary winding (N1) connects the drain electrode (D) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch, and non-induction end connects the positive pole of electric capacity (C4); The minus earth line of described electric capacity (C4); The induction end of described high frequency transformer (TH) secondary coil (N2) connects ground wire, and non-induction end connects an end of electric capacity (C3); The other end of described electric capacity (C3) connects an end of resistance (R4); The other end of described resistance (R4) connects the grid (G) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch; and connect the end (4) of the photoelectrical coupler (P2) of described detection protective circuit, and connect described pulse-width modulation PWM control circuit.
In the above-mentioned driver, described pulse-width modulation PWM control circuit comprises resistance (R5), resistance (R6), resistance (R7), resistance (R8), diode (VW1) and NPN type triode, positive-negative-positive triode;
Described resistance (R5) end connects ground wire, and the other end connects an end (3) of the photoelectrical coupler (P2) of described detection protective circuit, and connects the base stage of NPN type triode; The emitter of described NPN type triode connects ground wire, and collector electrode connects an end of resistance (R6); The other end of described resistance (R6) connects the grid (G) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch, and connects described startup holding circuit; One end of resistance (R7) connects the grid (G) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch, and connects described startup holding circuit, and the other end of resistance (R7) connects the emitter of positive-negative-positive triode; The collector electrode of described positive-negative-positive triode connects ground wire, and base stage connects the collector electrode of NPN type triode; The negative pole of described diode (VW1) connects the grid (G) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch, the anodal ground wire that connects; One end of described resistance (R8) connects the grid (G) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch, and the other end connects ground wire.
In the above-mentioned driver, described startup holding circuit comprises an end (3) of electric capacity (C2), resistance (R3), photoelectrical coupler (P1) and an end (4) of photoelectrical coupler (P1);
Described electric capacity (C2) end connects the positive pole of described current rectifying and wave filtering circuit electric capacity (C1), and the other end connects described resistance (R3); The other end of described resistance (R3) connects the V-type metal oxide semiconductor field-effect VMOS tube grid (G) of described electronic switch, and connects an end of the resistance (R7) of described pulse-width modulation PWM control circuit; One end (4) of described photoelectrical coupler (P1) connects the resistance (R1) of current rectifying and wave filtering circuit and the link of resistance (R2), one end (3) of described photoelectrical coupler (P1) connects the grid (G) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch, and connects an end of the resistance (R6) of described pulse-width modulation PWM control circuit.
As seen from the above technical solutions, in the utility model LED constant-flow driver, constant-current drive circuit is converted to constant DC stream with the AC power of importing and exports load LED to.When detecting protective circuit and detecting load LED abnormal conditions such as open circuit or short circuit take place; send a control signal to constant-current drive circuit; turn-off constant-current drive circuit, prevent that the mutation voltage of load end or electric current to the infringement of LED constant-flow driver internal circuit and load LED, having played protective effect.
Description of drawings
Fig. 1 is the wiring schematic diagram of led driver in the prior art.
Fig. 2 is the functional-block diagram of the utility model LED constant-flow driver.
Fig. 3 is the circuit diagram of the utility model LED constant-flow driver.
Fig. 4 is the flow through current diagram of inductance L and VMOS pipe of the utility model LED constant-flow driver.
Fig. 5 is the characteristic working curve figure of the load end LED of the utility model LED constant-flow driver.
Fig. 6 is the wiring schematic diagram of the utility model LED constant-flow driver.
Embodiment
For make the purpose of this utility model, technical scheme, and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.
In the utility model, a kind of LED constant-flow driver has been proposed in order to solve prior art problems, constant-current drive circuit is converted to constant DC stream with the AC power of input in this driver, exports load LED to.When detecting protective circuit and detect load LED and be in abnormal operating state, detect protective circuit and transmit control signal to constant-current drive circuit, stop its work, play a protective role.
Below in conjunction with Fig. 2 and Fig. 3, the structure of a kind of LED constant-flow driver of the utility model is described, specific as follows:
The utility model LED constant-flow driver comprises: constant-current drive circuit 101 and detection protective circuit 102; wherein; constant-current drive circuit 101 comprises current rectifying and wave filtering circuit 1011, step-down type dc translation circuit 1012, electronic switch 1013, regenerative circuit 1014, peak current negative-feedback circuit 1015, pulse-width modulation (Pulse-Width Modulation, PWM) control circuit 1016 and startup holding circuit 1017.
Current rectifying and wave filtering circuit 1011 becomes high direct voltage to export step-down type dc translation circuit 1012 to the AC power rectifying and wave-filtering of input, and output is connected mutation voltage and electric current to starting holding circuit 1017; Be transformed to sawtooth current after the high direct voltage step-down of step-down type dc translation circuit 1012 with input, and sawtooth current is transformed to constant DC stream exports to and detect protective circuit 102; Detect protective circuit 102 and export the constant DC stream that obtains to load LED, the constant current value of the direct current of the load LED that flows through is that the flow through sawtooth current of step-down type dc translation circuit 1012 is set 1/2nd of peak value; Start holding circuit 1017 output starting currents and keep electric current to pwm control circuit 1016; Electronic switch 1013 under the positive feedback effect of keeping electric current and regenerative circuit 1014 of pwm control circuit 1016 outputs, is in self oscillating regime according to the starting current conducting of pwm control circuit 1016 outputs, is in periodic conducting and cut-off state; When electronic switch 1013 conductings, the sawtooth current of step-down type dc translation circuit 1012 of flowing through exports electronic switch 1013 to, when the electric current of the electronic switch 1013 of flowing through reaches the setting peak value, peak current negative-feedback circuit 1015 outputs signal to pwm control circuit 1016, and pwm control circuit 1016 ends according to the signal controlling electronic switch 1013 that obtains; The flow through size of current peak of electronic switch 1013 of peak current negative-feedback circuit 1015 sampling, and this sampling value fed back to pwm control circuit 1016; Pwm control circuit 1016 is according to the ON time of the sampling value control electronic switch 1013 that obtains and the positive feedback effect of regenerative circuit 1014, change the PWM duty ratio of electronic switch 1013, characteristic according to electronic switch 1013 itself, the size of current peak of electronic switch 1013 of flowing through determined by the PWM duty ratio of electronic switch 1013, the current constant of the load LED that realizes flowing through.
When detecting protective circuit 102 and detecting load LED both end voltage and raise unusually, output control signals to the pwm control circuit 1016 of constant-current drive circuit 101, pwm control circuit 1016 ends according to control signal control electronic switch 1013, weaken the positive feedback effect of regenerative circuit 1014, electronic switch 1013 is ended by pwm control circuit 1016 controls and stops self-oscillation, and the LED constant-flow driver quits work; When the detection protective circuit detects load LED short circuit; output control signals to the startup holding circuit 1017 of constant-current drive circuit 101; startup holding circuit 1017 stops output and keeps electric current to pwm control circuit 1016; pwm control circuit 1016 ends according to control signal control electronic switch 1013; weaken the positive feedback effect of regenerative circuit 1014; electronic switch 1013 is ended by pwm control circuit 1016 controls and stops self-oscillation, and the LED constant-flow driver quits work.
Current rectifying and wave filtering circuit 1011 comprises fusing resistor R0, NTC thermistor Rt, single phase bridge type rectifier circu VD1-VD4, electrochemical capacitor C1 and R1, R2; Wherein, export behind the power rectifier of single phase bridge type rectifier circu VD1-VD4 with input, single phase bridge type rectifier circu VD1-VD4 has four terminals, is respectively 1 end, 2 ends, 3 ends and 4 ends, and wherein 1 end and 3 ends are output, and 2 ends and 4 ends are input; The end of the 4 termination NTC thermistor Rt of single phase bridge type rectifier circu VD1-VD4, the other end connecting to neutral line of thermistor Rt, Rt has negative resistance-temperature characteristic, and its resistance reduces along with the rising of temperature.When LED constant-flow driver initial start stage, Rt has certain normal temperature resistance, suppresses the combined floodgate impulse current, is accompanied by flowing through of electric current afterwards, self-heating, thus the resistance value of reduction oneself is to reduce power consumption; The end of the 2 termination fusing resistor R0 of single phase bridge type rectifier circu VD1-VD4, the other end of the fusing resistor R0 line of starting to exchange fire, when LED constant-flow driver inside was short-circuited, fusing resistor R0 quick-break was in order to avoid the driver large tracts of land burns out.The positive pole of the 1 termination electrochemical capacitor C1 of single phase bridge type rectifier circu VD1-VD4, the minus earth of electrochemical capacitor C1, electrochemical capacitor C1 mainly are the signal filterings after utilizing charge and discharge process to rectification; The 3 termination ground wires of single phase bridge type rectifier circu VD1-VD4; R1 one end connects the positive pole of electrochemical capacitor C1, and the other end connects the end of R2, and the other end of R2 is connected with ground wire.R1 and R2 form bleeder circuit.
Step-down type dc translation circuit 1012 comprises diode VD5, electrochemical capacitor C5 and inductance L, wherein the positive pole of diode VD5 connects the drain D of V-type metal oxide semiconductor field-effect (VMOS) pipe of electronic switch 1013, negative pole connects R1 and the anodal end that is connected of electrochemical capacitor C1 in the current rectifying and wave filtering circuit 1011, diode VD5 plays afterflow in step-down type dc translation circuit 1012, when electronic switch 1013 ends, diode VD5 conducting provides an afterflow path, make the unlikely interruption of electric current of the inductance L of flowing through, this afterflow path also is the path that the inductance L energy is released to load LED; The negative pole of the cathode connecting diode VD5 of electrochemical capacitor C5, the negative pole of electrochemical capacitor C5 connects an end of inductance L, and electrochemical capacitor C5 is in the state that charge and discharge replaces always, is used for sawtooth current is carried out filtering; The other end of inductance L connects the positive pole of diode VD5, mainly utilized the energy storage effect of inductance L in the utility model, the electric current of the inductance L of flowing through is the sawtooth current of step-down type dc translation circuit 1012 of flowing through, and as shown in Figure 4, the electric current of the inductance L of flowing through comprises peak I
KAnd mean value I
P, and I
PBe I
K1/2nd, I
PFor exporting the DC current values of load LED to, as the current peak I of the inductance L of flowing through
KFor setting peak value and when constant, the constant current value that exports the direct current of load LED to is I
P, the pass between the two is the content of prior art, concrete derivation does not repeat them here.
Start holding circuit 1017 and comprise start-up circuit and holding circuit, wherein, start-up circuit comprises capacitor C 2 and R3, and an end of capacitor C 2 connects the positive pole of the electrochemical capacitor C1 of current rectifying and wave filtering circuit 1011, and the other end connects R3; The other end of R3 connects the grid G of the VMOS pipe of electronic switch 1013; Holding circuit is 3,4 ends of photoelectrical coupler P2, and 4 ends connect the end that R1 is connected with R2 in the current rectifying and wave filtering circuit 1011, and 3 ends connect the grid G of the VMOS pipe of electronic switch 1013; When current rectifying and wave filtering circuit 1011 external AC power supplies are connected, the positive transition voltage that the electrochemical capacitor C1 of current rectifying and wave filtering circuit 1011 produces provides a sudden change charging current for the capacitor C 2 that starts holding circuit 1017, this electric current is by resistance R 3 input pwm control circuits 1016, the resistance R 1 of current rectifying and wave filtering circuit 1011 outputs current to 4 ends of the photoelectrical coupler P2 that starts holding circuit, when 4 ends of photoelectrical coupler P2 and 3 end conductings, output is kept electric current to pwm control circuit 1016.
Peak current negative-feedback circuit 1015 comprises sample resistance R9, R10 and R11, and sample resistance R9 one end connects the VMOS pipe source S of electronic switch 1013, and the other end connects ground wire; The R10 two ends are parallel to sample resistance R9 two ends; The end of R11 connects the source S of the VMOS pipe of electronic switch 1013, and the other end connects the base stage of NPN type triode in the pwm control circuit 1016; When the VMOS of the electronic switch 1013 of flowing through pipe source S current peak is when setting peak value, the current potential of sample resistance R9 equals the NPN type triode emitter junction voltage U be of pwm control circuit 1016 and the voltage drop sum on the R11, when the current peak of the VMOS of the electronic switch 1013 of flowing through pipe source S changes, the current potential of sample resistance R9 changes, there is electric current to flow through among the R11, this current value is the sampling value that peak current negative-feedback circuit 1015 exports pwm control circuit 1016 to, the duty ratio of pwm control circuit 1016 outputs is started to control to make use.
Detect protective circuit 102 and comprise many branch roads in parallel with output loading LED, wherein, article one, parallel branch comprises R12, the input of voltage stabilizing didoe VW2 and photoelectrical coupler P1, the positive pole of the electrochemical capacitor C5 of R12 one termination step-down type dc translation circuit 1012, the other end connects the negative pole of voltage stabilizing didoe VW2, the positive pole of voltage stabilizing didoe VW2 connects 1 end of photoelectrical coupler P1,2 ends of photoelectrical coupler P1 connect the negative pole of the electrochemical capacitor C5 of step-down type dc translation circuit 1012, pass through 1 of photoelectrical coupler P1 as electric current, during 2 ends, 3 of photoelectrical coupler P1 in the startup holding circuit 1017,4 end conductings, as 1 of P1, when 2 end no currents pass through, 3 of the photoelectrical coupler P1 in the startup holding circuit 1017,4 ends disconnect; The second parallel branch comprises R13,1 of photoelectrical coupler P2,2 ends, R14, controllable silicon SCR, the end of R13 is connected with 1 end of photoelectrical coupler P2, and the end that R12 is connected with electrochemical capacitor C5 in connection article one parallel branch, the other end of R13 connects an end of resistance R 14, the other end of R14 connects 2 ends of photoelectrical coupler P2, the T2 end of controllable silicon SCR connects the end that R13 is connected with R14, the T1 end connects 2 ends of the photoelectrical coupler P1 in article one parallel branch, the G end of controllable silicon SCR is connected with the positive pole of voltage stabilizing didoe VW3,3 ends of photoelectrical coupler P2 connect the base stage of the NPN triode of pwm control circuit 1016,4 ends connect the end that R6 is connected with the VMOS tube grid G of electronic switch 1013 in the pwm control circuit 1016, when 1 end of photoelectrical coupler P2 and 2 ends have electric current to flow through, 3 ends of photoelectrical coupler P2 and 4 end conductings have the base stage of electric current through the NPN type triode of photoelectrical coupler P2 input pwm control circuit 1016; The T2 of controllable silicon SCR end connects the negative pole of diode VD6 in the second parallel branch, and the positive pole of diode VD6 connects the negative pole of the voltage stabilizing didoe VW2 of article one parallel branch; Article three, parallel branch comprises: voltage stabilizing didoe VW3 and R15, the positive pole of voltage stabilizing didoe VW3 connects the G end of controllable silicon SCR, and the end of connection R15, the other end of R15 connects the T1 end of controllable silicon SCR, the negative pole of voltage stabilizing didoe VW3 connects the end of R16, and this branch road is connected in parallel on the two ends of R16; Article four, parallel branch comprises: R16, R17 and R18, the end of R16 connect the T1 end of controllable silicon SCR, and the other end connects an end of resistance R 17, and the other end of R17 is connected with 1 end of photoelectrical coupler P2, at the two ends of R17 adjustable resistance R18 in parallel.
Simply introduce the operation principle of the utility model LED constant-flow driver below:
When current rectifying and wave filtering circuit 1011 connects AC power in a flash, the positive pole of electrochemical capacitor C1 can produce a positive transition voltage, this connection mutation voltage makes the C2 of startup holding circuit 1017 and the branch road of R3 composition have a bigger charging current to pass through, this electric current exports pwm control circuit 1016 to, pwm control circuit 1016 is according to the VMOS pipe conducting of the bigger current trigger electronic switch 1013 that starts holding circuit 1017 outputs, and start working, 3 of the photoelectrical coupler P2 of startup holding circuit 1017,4 end conductings, output is kept electric current to pwm control circuit 1016, electronic switch 1013 is under the positive feedback effect of keeping electric current and regenerative circuit 1014 of pwm control circuit 1016 outputs, be in self oscillating regime, be in periodic conducting and cut-off state, just electronic switch 1013 is according to the PWM duty ratio conducting of pwm control circuit 1016 output with end, the PWM duty ratio is VMOS pipe ON time and ratio of cycle of oscillation in a cycle of oscillation of electronic switch 1013, the ON time of the voltage control electronic switch 1013 of the pwm control circuit 1016 VMOS tube grid G by changing electronic switch 1013, the cycle of oscillation of the power control electronic switch 1013 of the positive feedback effect by changing regenerative circuit 1014.
When LED constant-flow driver operate as normal, current rectifying and wave filtering circuit 1011 becomes high direct voltage with the AC power rectifying and wave-filtering of input, and export step-down type dc translation circuit 1012 to, become sawtooth current after the high direct voltage step-down of step-down type dc translation circuit 1012 with input, and export the sawtooth current rectifying and wave-filtering to load LED for constant DC stream, during abnormal conditions such as detection protective circuit 102 detection load LED generation open circuits or short circuit, send a control signal to constant-current drive circuit 101, turn-off constant-current drive circuit 101, the direct current constant current value of the load LED that flows through is that the flow through sawtooth current of step-down type dc translation circuit 1012 is set 1/2nd of peak value; Start holding circuit 1017 outputs and keep electric current to pwm control circuit 1016, electronic switch 1013 is under the positive feedback effect of keeping electric current and regenerative circuit 1014 of pwm control circuit 1016 outputs, be in self oscillating regime, be in periodic conducting and cut-off state, and the current peak of the VMOS pipe of the electronic switch 1013 of flowing through is consistent with its PWM change in duty cycle, when electronic switch 1013 conductings, the sawtooth current of step-down type dc translation circuit 1012 of flowing through exports electronic switch 1013 to, when the sawtooth current of the electronic switch 1013 of flowing through reaches the setting peak value, peak current negative-feedback circuit 1015 outputs signal to pwm control circuit 1016, and pwm control circuit 1016 ends according to the signal controlling electronic switch 1013 that obtains.
When load LED operate as normal, the peak value of the sawtooth current of input electronic switch 1013 is a set point, it is 2 times of direct current constant current value of load LED of flowing through that this sawtooth current is set peak value, the PWM duty ratio of pwm control circuit 1016 outputs is constant, and the DC current values of output loading LED is constant.When the current value of the load LED that flows through changes, the sawtooth current peak value of input electronic switch 1013 changes, this moment, the peak value of sawtooth current was not 2 times of direct current constant current value of the load LED that flows through, there is electric current to flow through in the peak current negative feedback branch road 1015, pwm control circuit 1016 is according to the current sampling value that obtains, change the current potential of the VMOS tube grid G of electronic switch 1013, change VMOS pipe ON time, regulate the positive feedback effect of regenerative circuit 1014, and then the PWM duty ratio of change output, make the peak value of the sawtooth current of the electronic switch 1013 of flowing through become 2 times of direct current constant current value of the load LED that flows through, the direct current of the load LED that flows through is constant.
LED opens a way when load; during situation that reversal connection or open circuit are connected again; output voltage sharply increases; when this voltage will detect the voltage stabilizing didoe VW3 puncture of protective circuit 102; the G end of controllable silicon SCR triggers; the T2 end of controllable silicon SCR and the conducting of T1 end; at this moment; there is electric current to flow through 1 end and 2 ends of photoelectrical coupler P2; because photoelectricity coupling; 3 ends of photoelectrical coupler P2 and 4 end conductings; there is electric current to export the base stage of the NPN type triode of pwm control circuit 1016 to through 3 ends of photoelectrical coupler P2; pwm control circuit 1016 utilizes the two-stage amplification of NPN type triode and positive-negative-positive triode; reduce the grid G voltage of electronic switch 1013VMOS pipe, weakened the positive feedback effect of regenerative circuit 1014, make the VMOS pipe of electronic switch 1013 stop self-oscillation; and the VMOS pipe of electronic switch 1013 is ended; constant-current drive circuit 101 quits work, and this moment, the LED constant-flow driver quit work, and had realized the protection to LED constant-flow driver internal circuit and load LED.
When load LED is short-circuited, 1 end of the photoelectrical coupler P1 of the detection protective circuit 102 of flowing through and the electric current of 2 ends are zero, because photoelectricity coupling, output 3 ends of photoelectrical coupler P1 and 4 ends disconnect, at this moment, startup holding circuit 1017 stops output and keeps electric current to pwm control circuit 1016, pwm control circuit 1016 reduces the voltage of the VMOS tube grid G of electronic switch 1013, the VMOS pipe of control electronic switch 1013 ends, the voltage at the secondary winding N2 two ends of regenerative circuit 1014 reduces simultaneously, has weakened positive feedback effect; Because load LED short circuit has caused the voltage at winding N1 two ends of regenerative circuit 1014 to reduce; weakened the positive feedback effect of regenerative circuit 1014; make the VMOS pipe of electronic switch 1013 stop self-oscillation; constant-current drive circuit 101 quits work; this moment, the LED constant-flow driver quit work, and had realized the protection to LED constant-flow driver internal circuit.
The particular circuit configurations that provides based on the foregoing description of the present utility model; can also realize overtemperature protection to load LED; specify as follows: Fig. 5 is the characteristic working curve figure of LED; LED self operating characteristic requires operating current to reduce along with the rising of temperature; if still keep the original constant current value of load LED constant this moment; may cause load LED overheated, the light efficiency of load LED reduces, light decay is accelerated, and shorten useful life.Requirement at this operating characteristic of load LED, the utility model LED constant-flow driver is provided with correspondingly anti-overheating protection circuit, and main emitter junction voltage U be by the NPN type triode in the pwm control circuit 1016 varies with temperature and realizes this anti-overtemperature protection; The temperature coefficient of the emitter junction voltage U be of NPN type triode is-2mv/ ℃, and 1 ℃ of the every rising of temperature, the voltage of the emitter junction of NPN type triode reduces 2mv; The crest voltage of the VMOS of electronic switch 1013 pipe source S is the voltage sum of the R11 of the emitter junction forward voltage drop of NPN type triode of pwm control circuit 1016 and current negative feedback circuit 1015, when ambient temperature raises, the forward voltage drop of emitter junction diminishes, pressure drop on the R11 of current negative feedback circuit 1015 is constant at this moment, the crest voltage of the VMOS pipe source S of electronic switch 1013 reduces, the current settings peak value of VMOS pipe of electronic switch 1013 of flowing through reduces, according to the current settings peak value of the VMOS pipe of the electronic switch 1013 of flowing through is 2 times the relation of constant current value of load LED of flowing through, the constant current value of load LED of flowing through reduces, characteristic working curve according to LED, at this moment, LED still is in normal operating conditions.
Fig. 6 is the wiring schematic diagram of the utility model LED constant-flow driver, when the load LED of the utility model LED constant-flow driver adopts the connected mode of series connection as shown in Figure 6, because this driver control circuit is simple, reduces the control circuit power consumption to greatest extent; The utility model LED constant-flow driver can be realized power supply, led module and constant-flow driver three's optimum Match, makes circuit working at efficient state; Current value when the current value of the internal drive of flowing through is connected in parallel than load is little, power with respect to load LED consumption, the power of internal drive circuitry consumes is very little, this LED constant-flow driver can be realized 93% conversion efficiency, and the conversion efficiency of LED constant-flow driver of the prior art has effectively utilized resource well below the utility model LED constant-flow driver.
In the present embodiment, electronic switch 1013 utilizes VMOS pipe to realize switching function, also can utilize other electronic components with switching function such as metal-oxide-semiconductor, triode to replace, the current constant of the load LED that also can realize flowing through.
In sum, be preferred embodiment of the present utility model more than, be not to be used for limiting protection range of the present utility model.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1, a kind of LED constant-flow driver is characterized in that, this driver comprises constant-current drive circuit and detects protective circuit;
Described constant-current drive circuit becomes constant DC stream with the AC power of importing and exports the LED load to; When described detection protective circuit detects load LED open circuit or short circuit, send a control signal to described constant-current drive circuit, constant-current drive circuit is turn-offed.
2, driver according to claim 1, it is characterized in that described constant-current drive circuit comprises current rectifying and wave filtering circuit, step-down type dc translation circuit, electronic switch, regenerative circuit, peak current negative feedback branch road, pulse-width modulation PWM control circuit and starts holding circuit;
Described current rectifying and wave filtering circuit becomes high direct voltage to export to described step-down type dc translation circuit the AC power rectifying and wave-filtering of input, and output is connected mutation voltage and electric current to described startup holding circuit;
The connection mutation voltage that described startup holding circuit is exported current rectifying and wave filtering circuit is converted to starting current and exports described pulse-width modulation PWM control circuit to, and, described pulse-width modulation PWM control circuit keeps electric current for providing, when load LED short circuit, described startup holding circuit receives the control signal of described detection protective circuit output and turn-offs, and stops output and keeps electric current to described pulse-width modulation PWM control circuit;
Be transformed to sawtooth current after the high direct voltage step-down of described step-down type dc translation circuit with input, and sawtooth current is filtered into direct current exports to load LED, the value of this direct current is 1/2nd of a sawtooth current peak value;
Described electronic switch is according to the starting current of described pulse-width modulation PWM control circuit output and conducting, and under the positive feedback effect of keeping electric current and described regenerative circuit of described pulse-width modulation PWM control circuit output, produce self-oscillation, be in periodic conducting and cut-off state, when described electronic switch conducting, described step-down type dc translation circuit exports sawtooth current to electronic switch, when the sawtooth current of the electronic switch of flowing through reaches the setting peak value, described peak current negative-feedback circuit output sampling value is to described pulse-width modulation PWM control circuit, and described pulse-width modulation PWM control circuit is controlled described electronic switch and ended;
The flow through current peak of described electronic switch of described peak current negative-feedback circuit sampling, and this sampling value fed back to described pulse-width modulation PWM control circuit;
When the sampling value of described peak current negative-feedback circuit changes, described pulse-width modulation PWM control circuit changes the pulse-width modulation PWM duty ratio that exports described electronic switch to by the ON time of the described electronic switch of control and the positive feedback effect of regenerative circuit; Described pulse-width modulation PWM duty ratio is the time of conducting in cycle of oscillation of described electronic switch and the ratio of cycle of oscillation, when load LED both end voltage occurs when unusual, receive the control signal of described detection protective circuit output, weaken the positive feedback effect of described regenerative circuit, described pulse-width modulation PWM control circuit is controlled described electronic switch and is ended; When load LED short circuit, described pulse-width modulation PWM control circuit is controlled described electronic switch and is ended according to the positive feedback effect that electric current weakens described regenerative circuit of keeping that receives described startup holding circuit output.
3, driver according to claim 2, it is characterized in that described detection protective circuit comprises: an end (1) of resistance (R12), resistance (R13), resistance (R14), resistance (R15), resistance (R16), resistance (R17), resistance (R18) and photoelectrical coupler (P1), an end (2) of photoelectrical coupler (P1), photoelectrical coupler (P2), diode (VW2), diode (VW3), diode (VD6), controllable silicon (SCR);
Described resistance (R12) end connects an end of resistance (R13), and the other end connects the negative pole of diode (VW2); The other end of described resistance (R13) connects an end (T2) of controllable silicon (SCR); The positive pole of described diode (VW2) connects an end (1) of photoelectrical coupler (P1): an end (2) of photoelectrical coupler (P1) connects an end (T1) of controllable silicon (SCR); One end (G) of described controllable silicon (SCR) is connected with the positive pole of diode (VW3); The negative pole of described diode (VW3) connects an end of resistance (R16); The other end of described resistance (R16) connects an end of resistance (R15), and connects an end (T1) of controllable silicon (SCR); The other end of described resistance (R15) connects the positive pole of diode (VW3); The negative pole of the cathode connecting diode (VW2) of described diode (VD6), the negative pole of diode (VD6) connects an end (T2) of controllable silicon (SCR); One end (1) the connection resistance (R12) of described photoelectrical coupler (P2) and an end that is connected of resistance (R13), one end (2) of photoelectrical coupler (P2) connects an end of resistance (R14), one end (3) of photoelectrical coupler connects described pulse-width modulation PWM control circuit and peak current negative-feedback circuit, and an end (4) of photoelectrical coupler (P2) connects described electronic switch, described startup holding circuit, described regenerative circuit and described pulse-width modulation PWM control circuit; The other end of described resistance (R14) connects an end (T2) of controllable silicon (SCR); One end of described resistance (R17) connects an end (1) of photoelectrical coupler (P2), and connects the positive pole of load LED, and the other end connects the negative pole of diode (VW3); One end of described resistance (R18) connects an end (1) of photoelectrical coupler (P2), and connects the positive pole of load LED, and the other end connects the negative pole of diode (VW3); Described resistance (R12) is connected described step-down type dc translation circuit with an end (2) of the link of resistance (R13), described photoelectrical coupler (P1).
4, driver according to claim 3 is characterized in that, described current rectifying and wave filtering circuit comprises: fusing resistor (R0), resistance (Rt), single phase bridge type rectifier circu (VD1-VD4), electric capacity (C1) and resistance (R1), resistance (R2);
One end of one end (4) connecting resistance (Rt) of described single phase bridge type rectifier circu (VD1-VD4), the other end connecting to neutral line of resistance (Rt); One end (2) of described single phase bridge type rectifier circu (VD1-VD4) connects an end of fusing resistor (R0), the other end of fusing resistor (R0) line of starting to exchange fire; One end (1) of described single phase bridge type rectifier circu (VD1-VD4) connects the positive pole of electric capacity (C1), the minus earth line of electric capacity (C1); One end (3) earth connection of described single phase bridge type rectifier circu (VD1-VD4); Resistance (R1) end connects the positive pole of electric capacity (C1), and connects an end (1) of the photoelectrical coupler (P2) of described detection protective circuit, and the other end of resistance (R1) connects an end of resistance (R2), and connects described startup holding circuit; The other end of resistance (R2) is connected with ground wire; The positive pole of described electric capacity (C1) connects described step-down type dc translation circuit, and connects described startup holding circuit.
5, driver according to claim 4 is characterized in that, described step-down type dc translation circuit comprises diode (VD5), electric capacity (C5) and inductance (L);
The positive pole of described diode (VD5) connects an end of inductance (L), and connects described electronic switch, described regenerative circuit, and the negative pole of diode (VD5) connects the positive pole of the electric capacity (C1) of described current rectifying and wave filtering circuit; The other end of described inductance (L) connects the negative pole of electric capacity (C5), and connects an end (2) of described detection protective circuit photoelectrical coupler (P1); The positive pole of described electric capacity (C5) connects the negative pole of described diode (VD5), and connects the link of described detection protective circuit resistance (R12) and resistance (R13).
6, driver according to claim 5 is characterized in that, described electronic switch is a V-type metal oxide semiconductor field-effect VMOS pipe;
The source electrode (S) of described V-type metal oxide semiconductor field-effect VMOS pipe connects described peak current negative-feedback circuit; The grid (G) of described V-type metal oxide semiconductor field-effect VMOS pipe connects an end (4) of the photoelectrical coupler (P2) of described detection protective circuit, and connects described startup holding circuit, described pulse-width modulation PWM control circuit and described regenerative circuit; The drain electrode (D) of described V-type metal oxide semiconductor field-effect VMOS pipe connects the positive pole of the diode (VD5) of described step-down type dc translation circuit, and connects described regenerative circuit.
7, driver according to claim 6, it is characterized in that, described peak current negative-feedback circuit comprises: resistance (R9), resistance (R10) and resistance (R11), described resistance (R9) end connects the source electrode (S) of the V-type metal oxide semiconductor field-effect VMOS pipe of electronic switch, and the other end connects ground wire; Described resistance (R10) is connected in parallel on described resistance (R9) two ends; One end of described resistance (R11) connects the source electrode (S) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch; the other end connects an end (3) of the photoelectrical coupler (P2) of described detection protective circuit, and connects described pulse-width modulation PWM control circuit.
8, driver according to claim 7 is characterized in that, described regenerative circuit comprises high frequency transformer (TH), electric capacity (C4), electric capacity (C3) and resistance (R4);
Described high frequency transformer (TH) comprises primary winding (N1), secondary coil (N2);
The induction end of described high frequency transformer (TH) primary winding (N1) connects the drain electrode (D) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch, and non-induction end connects the positive pole of electric capacity (C4); The minus earth line of described electric capacity (C4); The induction end of described high frequency transformer (TH) secondary coil (N2) connects ground wire, and non-induction end connects an end of electric capacity (C3); The other end of described electric capacity (C3) connects an end of resistance (R4); The other end of described resistance (R4) connects the grid (G) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch; and connect the end (4) of the photoelectrical coupler (P2) of described detection protective circuit, and connect described pulse-width modulation PWM control circuit.
9, driver according to claim 8 is characterized in that, described pulse-width modulation PWM control circuit comprises resistance (R5), resistance (R6), resistance (R7), resistance (R8), diode (VW1) and NPN type triode, positive-negative-positive triode;
Described resistance (R5) end connects ground wire, and the other end connects an end (3) of the photoelectrical coupler (P2) of described detection protective circuit, and connects the base stage of NPN type triode; The emitter of described NPN type triode connects ground wire, and collector electrode connects an end of resistance (R6); The other end of described resistance (R6) connects the grid (G) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch, and connects described startup holding circuit; One end of resistance (R7) connects the grid (G) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch, and connects described startup holding circuit, and the other end of resistance (R7) connects the emitter of positive-negative-positive triode; The collector electrode of described positive-negative-positive triode connects ground wire, and base stage connects the collector electrode of NPN type triode; The negative pole of described diode (VW1) connects the grid (G) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch, the anodal ground wire that connects; One end of described resistance (R8) connects the grid (G) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch, and the other end connects ground wire.
10, driver according to claim 9 is characterized in that, described startup holding circuit comprises an end (3) of electric capacity (C2), resistance (R3), photoelectrical coupler (P1) and an end (4) of photoelectrical coupler (P1);
Described electric capacity (C2) end connects the positive pole of described current rectifying and wave filtering circuit electric capacity (C1), and the other end connects described resistance (R3); The other end of described resistance (R3) connects the V-type metal oxide semiconductor field-effect VMOS tube grid (G) of described electronic switch, and connects an end of the resistance (R7) of described pulse-width modulation PWM control circuit; One end (4) of described photoelectrical coupler (P1) connects the resistance (R1) of current rectifying and wave filtering circuit and the link of resistance (R2), one end (3) of described photoelectrical coupler (P1) connects the grid (G) of the V-type metal oxide semiconductor field-effect VMOS pipe of described electronic switch, and connects an end of the resistance (R6) of described pulse-width modulation PWM control circuit.
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|---|---|---|---|
| CNU2009201056418U CN201369862Y (en) | 2009-02-04 | 2009-02-04 | LED constant current driver |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2009201056418U CN201369862Y (en) | 2009-02-04 | 2009-02-04 | LED constant current driver |
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