CN204859619U - Can reduce linear constant current LED drive arrangement of wick quantity - Google Patents
Can reduce linear constant current LED drive arrangement of wick quantity Download PDFInfo
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- CN204859619U CN204859619U CN201520422607.9U CN201520422607U CN204859619U CN 204859619 U CN204859619 U CN 204859619U CN 201520422607 U CN201520422607 U CN 201520422607U CN 204859619 U CN204859619 U CN 204859619U
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Abstract
The utility model discloses a can reduce linear constant current LED drive arrangement of wick quantity, including rectifier module, energy storage device, switch module, constant current source module, detection module and control module. Through control module, when voltage difference that voltage difference at switch module both ends is less than a threshold voltage and constant current source module both ends was less than the 2nd threshold voltage, control switch module switched on, makes rectifier module charge, give the statements based on collusion of LED lamp for energy storage device, voltage difference at switch module both ends is higher than a threshold voltage, and when perhaps the voltage difference at constant current source module both ends was higher than the 2nd threshold voltage, the control switch module disconnection made energy storage device give the statements based on collusion of LED lamp, realize that rectifier module and energy storage device give LED lamp statements based on collusion electricity in turn, make LED lamp cluster VF value sum need not with rectifier module output voltage maximum value matching, reduction that the quantity of LED lamp cluster of lamps, ornamental core can be very big to keep very high drive efficiency.
Description
Technical field
The utility model relates to field of LED drive, particularly a kind of linear constant current LED drive device reducing wick quantity.
Background technology
Fig. 1 and Fig. 2 is the oscillogram in the application circuit of existing linear constant current chip and the course of work.Voltage peak on electric capacity is the maximum output voltage of rectifier bridge, and minimum value is higher, higher to the quantitative requirement of wick like this than wick VF value sum in lamp string, usually for 220V application lamp pearl quantitative requirement about 80.When input voltage raises/reduces, the voltage on electric capacity increases/reduces, and the efficiency of such system can change along with the change of input voltage.When input voltage is very high, the power consumption on chip can sharply raise, the stability of system and less reliable.
Thus prior art need to improve.
Utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is to provide a kind of linear constant current LED drive device reducing wick quantity, the VF value sum of lamp cluster of lamps, ornamental core need not be matched with rectifier bridge output voltage maximum, the quantity of wick can reduce greatly, meanwhile can keep very high drive efficiency.
In order to achieve the above object, the utility model takes following technical scheme:
Reduce a linear constant current LED drive device for wick quantity, comprise rectification module, energy-storage travelling wave tube, switch module, constant-current source module, detection module and control module;
Described rectification module carries out rectification to the alternating current that outside inputs and acts in collusion to make each other's confessions electric to described energy-storage travelling wave tube and LED; Described switch module controls the discharge and recharge of described energy-storage travelling wave tube and the power supply of LED string by the break-make of self; Described constant-current source module makes the constant current hold of LED string; Described detection module detects the voltage difference at constant-current source module two ends, and the voltage difference of detection is exported to described control module; The voltage difference of described control module at switch module two ends lower than first threshold voltage and the voltage difference at constant-current source module two ends lower than Second Threshold voltage time, the conducting of control switch module make rectification module to energy-storage travelling wave tube charging and to LED statements based on collusion electricity; Voltage difference at switch module two ends higher than first threshold voltage, or the voltage difference at constant-current source module two ends higher than Second Threshold voltage time, control switch module disconnect make energy-storage travelling wave tube to LED statements based on collusion electricity.
In the linear constant current LED drive device of described reduced wick quantity, described drive unit also comprises: for forward conduction, the one-way conduction module preventing energy-storage travelling wave tube from leaking electricity; Described switch module is by one end of one-way conduction model calling energy-storage travelling wave tube and the positive pole of LED string.
In the linear constant current LED drive device of described reduced wick quantity, the ceiling voltage that when described first threshold voltage is the unlatching of described switch module, two ends can be born.
In the linear constant current LED drive device of described reduced wick quantity, described control module comprises:
Voltage for being exported by detection module carries out level shift, and the voltage shifts that detection module is exported is to the electrical level shift units of the voltage domain of switch module;
For the switching voltage detecting unit of the size of the voltage difference at sense switch module two ends, the voltage difference comparing switch module two ends and first threshold voltage;
For the voltage difference at switch module two ends lower than first threshold voltage and the voltage difference at constant-current source module two ends lower than Second Threshold voltage time, the conducting of control switch module makes energy-storage travelling wave tube charge; Voltage difference at switch module two ends higher than first threshold voltage, or the voltage difference at constant-current source module two ends higher than Second Threshold voltage time, control switch module disconnect make energy-storage travelling wave tube stop charging switch control unit.
In the linear constant current LED drive device of described reduced wick quantity, described switch module comprises the first metal-oxide-semiconductor, the drain electrode of described first metal-oxide-semiconductor connects the output of rectification module, the source electrode of described first metal-oxide-semiconductor connects the positive pole of one-way conduction module, and the grid of described first metal-oxide-semiconductor is the control signal input of described switch module, connects described switch control unit.
In the linear constant current LED drive device of described reduced wick quantity, described electrical level shift units comprises power supply, the first resistance and inverter; The minus earth of described power supply, the positive pole of described power supply connects one end of the first resistance and the power positive end of inverter, the other end of described first resistance is the input of the input of described electrical level shift units, the output of connection detection module and inverter, the power supply negative terminal ground connection of described inverter, the output of described inverter is the output of described electrical level shift units, the grid connecting the first metal-oxide-semiconductor.
In the linear constant current LED drive device of described reduced wick quantity, described detection module comprises the second resistance, the 3rd resistance, the first reference voltage source, the second metal-oxide-semiconductor and comparator; One end of described second resistance be detection module input, connect the input of constant-current source module and the negative pole of LED string, the other end of described second resistance connects the normal phase input end of comparator, also by the 3rd grounding through resistance; The positive pole of described first reference voltage source connects the inverting input of comparator, the minus earth of described first reference voltage source, the output of described comparator connects the grid of the second metal-oxide-semiconductor, the source ground of described second metal-oxide-semiconductor, the drain electrode of described second metal-oxide-semiconductor is the output of described detection module, connects described switch control unit.
In the linear constant current LED drive device of described reduced wick quantity, described constant-current source module comprises the 4th resistance, the second reference voltage source, the 3rd metal-oxide-semiconductor and operational amplifier; The drain electrode of described 3rd metal-oxide-semiconductor be described constant-current source module input, connect the negative pole of external LED lamp article and one end of described second resistance, the source electrode of described 3rd metal-oxide-semiconductor connect described operational amplifier inverting input, also by the 4th grounding through resistance, the normal phase input end of the positive pole concatenation operation amplifier of described second reference voltage source, the minus earth of described second reference voltage source.
In the linear constant current LED drive device of described reduced wick quantity, described energy-storage travelling wave tube comprises electric capacity.
In the linear constant current LED drive device of described reduced wick quantity, described one-way conduction module comprises diode, and described switch module connects one end of energy-storage travelling wave tube and the positive pole of LED string by described diode.
Compared to prior art, the linear constant current LED drive device of the reduced wick quantity that the utility model provides, arranges switch module and controls the discharge and recharge of energy-storage travelling wave tube and the turn-on and turn-off of LED string by the break-make of self; Detected the voltage difference at constant-current source module two ends by detection module, the voltage difference of detection is exported to control module; By control module, the voltage difference at switch module two ends lower than first threshold voltage and the voltage difference at constant-current source module two ends lower than Second Threshold voltage time, the conducting of control switch module, make rectification module to energy-storage travelling wave tube charging, to LED statements based on collusion electricity; Voltage difference at switch module two ends higher than first threshold voltage, or the voltage difference at constant-current source module two ends higher than Second Threshold voltage time, control switch module disconnect, make energy-storage travelling wave tube stop charging, now energy-storage travelling wave tube start statements based on collusion to LED electricity; Thus, realize rectification module and energy-storage travelling wave tube alternately to LED statements based on collusion electricity, the VF value sum of LED string need not be matched, relative to prior art with rectification module output voltage maximum, the quantity of LED cluster of lamps, ornamental core can reduce greatly, has greater flexibility; Meanwhile when input voltage changes, whole drive unit can keep very high drive efficiency.
Accompanying drawing explanation
Fig. 1 is the application circuit of existing linear constant current chip.
Fig. 2 is the oscillogram in the application circuit course of work of existing linear constant current chip.
The structured flowchart of the linear constant current LED drive device of the reduced wick quantity that Fig. 3 provides for the utility model.
In the linear constant current LED drive device of the reduced wick quantity that Fig. 4 provides for the utility model, the oscillogram of the waveform on the waveform that rectification module exports, energy-storage travelling wave tube and the voltage in constant-current source module.
Fig. 5 a is in the linear constant current LED drive device of the reduced wick quantity that the utility model provides, the curve that power changes with line voltage;
Fig. 5 b is in the linear constant current LED drive device of the reduced wick quantity that the utility model provides, the curve that efficiency changes with line voltage.
In the linear constant current LED drive device of the reduced wick quantity that Fig. 6 provides for the utility model, the circuit diagram of switch module.
In the linear constant current LED drive device of the reduced wick quantity that Fig. 7 provides for the utility model, the circuit diagram of electrical level shift units.
In the linear constant current LED drive device of the reduced wick quantity that Fig. 8 provides for the utility model, the circuit diagram of detection module.
In the linear constant current LED drive device of the reduced wick quantity that Fig. 9 provides for the utility model, the circuit diagram of constant-current source module.
In the linear constant current LED drive device of the reduced wick quantity that Figure 10 provides for the utility model, the structured flowchart of another embodiment.
In the linear constant current LED drive device of the reduced wick quantity that Figure 11 provides for the utility model, the structured flowchart of other embodiments.
Embodiment
The utility model provides a kind of the linear constant current LED drive device and the LED television that reduce wick quantity.For making the purpose of this utility model, technical scheme and effect clearly, clearly, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 3, the linear constant current LED drive device of the reduced wick quantity that the utility model provides, comprises rectification module 10, switch module 20, control module 30, one-way conduction module 40, LED string 50, detection module 60, constant-current source module 70 and energy-storage travelling wave tube 80.
Described rectification module 10 carries out rectification to the alternating current that outside inputs and powers to described energy-storage travelling wave tube 80 and LED string 50; Described switch module 20 controls the discharge and recharge of described energy-storage travelling wave tube 80 and the power supply of LED string 50 by the break-make of self; Described constant-current source module 70 makes the constant current hold of LED string 50; Described detection module 60 detects the voltage difference at constant-current source module 70 two ends, and the voltage of detection is exported to described control module 30; The voltage difference of described control module 30 at switch module 20 two ends lower than first threshold voltage Vth1 and the voltage difference at constant-current source module 70 two ends lower than Second Threshold voltage Vth2 time, control switch module 20 conducting, makes rectification module 10 charge to energy-storage travelling wave tube 80 and power to LED string 50; Voltage difference at switch module 20 two ends is higher than first threshold voltage Vth1, or when the voltage difference at constant-current source module 70 two ends is higher than Second Threshold voltage Vth2, described control module 30 control switch module 20 disconnects, and make energy-storage travelling wave tube 80 stop charging, energy-storage travelling wave tube 80 is powered to LED string 40.
It can thus be appreciated that, the linear constant current LED drive device of the reduced wick quantity that the utility model provides, the VF magnitude of voltage sum of LED cluster of lamps, ornamental core need not be matched with rectification module 10 output voltage maximum, the quantity of wick can reduce greatly, meanwhile can keep very high drive efficiency.The VF voltage of described wick is a parameter of lamp pearl, Chinese forward voltage by name, i.e. the voltage at lamp pearl two ends under certain electric current.
The linear constant current LED drive device of the reduced wick quantity that the utility model provides, wherein each module can adopt multiple connected mode, as shown in Figure 3, is a preferred embodiment of the present utility model.
Concrete, described rectification module 10, carries out rectification for the alternating current inputted outside, and charges and power to LED string 50 to described energy-storage travelling wave tube 80.Preferably, described rectification module 10 is rectifier bridge.
Described energy-storage travelling wave tube 80, for energy storage, charging and discharging; Preferably, described energy-storage travelling wave tube 80 comprises electric capacity.
Described switch module 20, for controlling energy-storage travelling wave tube 80 charging and discharging; That is, control energy-storage travelling wave tube 80 to power to LED string 50, control rectification module 10 to the charging of energy-storage travelling wave tube 80.
Described constant-current source module 70, for making the constant current hold of LED string 50.
Described detection module 60, for detecting the voltage difference at constant-current source module 70 two ends, comparing the voltage difference at constant-current source module 70 two ends and the size of Second Threshold voltage Vth2, and comparative result is exported to control module 30.
Described control module 30, for the voltage difference at sense switch module 20 two ends, the relatively voltage difference at switch module 20 two ends and the size of first threshold voltage Vth1, voltage difference at switch module 20 two ends lower than first threshold voltage Vth1 and the voltage difference at constant-current source module 70 two ends lower than Second Threshold voltage Vth2 time, control switch module 20 conducting makes energy-storage travelling wave tube 80 charge; Voltage difference at switch module 20 two ends higher than first threshold voltage Vth1, or the voltage difference at constant-current source module 70 two ends higher than Second Threshold voltage Vth2 time, control switch module 20 disconnect energy-storage travelling wave tube 80 is powered to LED string 50.
The input of described rectification module 10 connects external communication electricity (220V), and the output of described rectification module 10 connects one end of energy storage original paper 80 and the positive pole of LED string 50 by described switch module 20; The other end ground connection of described energy storage original paper 80, the negative pole of described LED string 50 connects the input of constant-current source module 70 and the first input end 1 of detection module 60, the output of described constant-current source module 70 and the second input 2 ground connection of detection module 60, the output of described detection module 60 is by the control signal input of described control module 30 connecting valve module 20.
Described LED string 50, is made up of the LED lamp bead of multiple series connection.
Described one-way conduction module 40, for forward conduction, prevents energy-storage travelling wave tube 80 from leaking electricity.Described switch module 20 connects one end of energy-storage travelling wave tube 80 and the positive pole of LED string 50 by one-way conduction module 40.Concrete, described one-way conduction module 40 comprises diode, and described switch module 20 connects one end of energy-storage travelling wave tube 80 and the positive pole of LED string 50 by described diode.
Further, described control module 30 comprises electrical level shift units 310, switch control unit 320 and switching voltage detecting unit 330.
Described electrical level shift units 310, carries out level shift for the voltage exported by detection module 60, and the voltage shifts that detection module 60 is exported is to the voltage domain of switch module 20.That is, described detection module 60 output voltage realizes the conversion of voltage domain by electrical level shift units 310.Described switch module 20 and control module 30 are used to control to the charging of energy-storage travelling wave tube 80, rectification module 10 forward must be connected on export between energy-storage travelling wave tube 80, so the current potential above the ground of switch module 20 and control module 30 (minimum) current potential and energy-storage travelling wave tube 80 is basically identical.Because control module 30 can carry out control switch module 20 according to the output of detection module 60, and the negative sense that the ground reference of detection module 60 and constant-current source module 70 is rectification module 10 exports, its ground reference is different from the ground reference of switch module 20, so need the output of detection module 60 to carry out level shift.By described electrical level shift units 310, make the control of control module 30 pairs of switch modules 20 more accurate, further increase the power supplying efficiency of LED string.
Described switching voltage detecting unit 330, for the voltage difference at sense switch module 20 two ends, compares the voltage difference at switch module 20 two ends and the size of first threshold voltage Vth1, and comparative result is exported to described switch control unit 320; Described switching voltage detecting unit 330 acts on identical with detection module 60, and be all used for detecting the size of voltage difference and comparative voltage difference and threshold voltage, therefore its circuit part can be identical, certainly, also can adopt different circuit design, the utility model is not construed as limiting.
Described switch control unit 320, for the voltage difference at switch module 20 two ends lower than first threshold voltage Vth1 and the voltage difference at constant-current source module 70 two ends lower than Second Threshold voltage Vth2 time, control switch module 20 conducting makes energy-storage travelling wave tube 80 charge; Voltage difference at switch module 20 two ends higher than first threshold voltage Vth1, or the voltage difference at constant-current source module 70 two ends higher than Second Threshold voltage Vth2 time, control switch module 20 disconnect make energy-storage travelling wave tube 80 stop charging.
Please continue to refer to Fig. 3, what in figure, dotted arrow indicated is operating state 1, namely the flow direction of electric current when switch module 20 is opened, at this moment the output stream of rectification module 10 charges through switch module 20 and one-way conduction module 40 pairs of energy-storage travelling wave tubes 80, also powers to LED string 50, constant-current source module 70 and detection module 60 simultaneously.What realize arrows is operating state 2, the flow direction of electric current when namely switch module 20 turns off, and at this moment energy-storage travelling wave tube 80 pairs of LED strings 50 discharge.As can be seen from Figure 3 during switch module 20 switching, described linear constant current LED drive device can switch between two kinds of operating states.
See also Fig. 4, be followed successively by from top to bottom in the course of work in Fig. 4, rectification module 10(rectifier bridge) waveform (Vac) that exports, the waveform (Vc) on energy-storage travelling wave tube 80, the voltage (Vtail) in constant-current source module 70 waveform.And the voltage of described LED string 50 is Vc-Vtail, therefore the waveform of Vc and Vtail is as shown in Figure 4 known, and the voltage on LED string 50 remains unchanged.
In T1 to the T2 time period, described linear constant current LED drive device is operated in state 1.Voltage above constant-current source module 70 is lower than the Second Threshold voltage Vth2 of setting, the voltage difference at switch module 20 two ends lower than the first threshold voltage Vth1 set, and switch module 20 is opened, and rectifier bridge exports and charges to energy-storage travelling wave tube 80.In the T2 moment, when the voltage above constant-current source module 70 reaches setting Second Threshold voltage Vth2, switch module 20 turns off, and stops charging to energy-storage travelling wave tube 80.
Wherein, described first threshold voltage Vth1 is arranged according to the needs of side circuit, preferably, for the ceiling voltage that two ends when described switch module 20 is opened can be born, it is decided by the overcurrent capability of switch, if both end voltage is too high, during unlatching, electric current is excessive, may burn out switching tube.Second Threshold voltage Vth2 limits the ceiling voltage on energy-storage travelling wave tube 80, the efficiency of direct influential system, improves Second Threshold voltage Vth2, and the efficiency of system reduces; Reduce Second Threshold voltage Vth2, the efficiency of whole system raises.Preferably, described Second Threshold voltage Vth2 is set to about 30% of described LED string 50 voltage, can ensure that the efficiency of system is about 85% like this.
In the time period of T2 to T3, system works is in state 2.Because the output voltage of rectifier bridge is in rising, so the voltage difference at switch module 20 two ends exceedes the first threshold voltage Vth1 of setting, switch module 20 is in the state of shutoff.Energy-storage travelling wave tube 80 couples of LED string 50(load) electric discharge, the voltage on energy-storage travelling wave tube 80 constantly declines.
In the time period of T3 to T4, system works is in state 1.The voltage difference at switch module 20 two ends is less than the first threshold voltage Vth1 of setting, and simultaneously because energy-storage travelling wave tube 80 is discharging always, the voltage difference at constant-current source module 70 two ends is less than the Second Threshold voltage Vth2 of setting; Switch module 20 reopens, and rectifier bridge exports and charges to energy-storage travelling wave tube 80.
In T4 to the T5 time period, system works is in state 2.The voltage difference at energy-storage travelling wave tube 80 two ends is higher than rectifier bridge output voltage, and one-way conduction module 40 is in cut-off state.Energy-storage travelling wave tube 80 pairs of LED strings 50 discharge, and the voltage at energy-storage travelling wave tube 80 two ends constantly reduces.
T5 to the T6 time period has got back to again T1 to the T2 time period, does not repeat them here.
In prior art, storage capacitor is connected on the output of rectifier bridge, the ceiling voltage that the voltage on storage capacitor exports close to rectifier bridge, thus the VF voltage of LED string can not be too large with the voltage phase difference on storage capacitor, otherwise the efficiency of system is very low, the non-constant of reliability.And the linear constant current LED drive device that the utility model provides, by controlling the charging and discharging of energy-storage travelling wave tube 80, voltage on energy-storage travelling wave tube 80 is no more than LED crosstalk pressure VF value summation and adds Second Threshold voltage Vth2, substantially uncorrelated with the input voltage of energy-storage travelling wave tube 80; When in LED string wick quantity reduce increase time, the voltage on energy-storage travelling wave tube 80 also thereupon accordingly reduce increase.With traditional scheme comparison, the VF value sum of the scheme LED cluster of lamps, ornamental core that the utility model provides need not match with rectifier bridge output voltage maximum, the quantity of wick can reduce greatly, meanwhile can keep very high drive efficiency when input voltage changes.Be illustrated in figure 5 in the linear constant current LED drive device that the utility model provides, when adopting 56 lamp pearls, the curve that power and efficiency change with line voltage, wherein, Fig. 5 a is the curve that power changes with line voltage, and Fig. 5 b is the curve that efficiency changes with line voltage.Visible, the linear constant current LED drive device that the utility model provides, not only in LED string, wick quantity is by the impact that rectifier bridge exports, and when input voltage changes, power is highly stable, the very high and quite stable of efficiency.
Further, refer to Fig. 6, described switch module 20 comprises the first metal-oxide-semiconductor Q1, the drain electrode of described first metal-oxide-semiconductor Q1 connects the output of rectification module 10, the source electrode of described first metal-oxide-semiconductor Q1 connects the positive pole of one-way conduction module 40, and the grid of described first metal-oxide-semiconductor Q1 is the control signal input of described switch module 20, connects described switch control unit 320.
Refer to Fig. 7, described electrical level shift units 310 comprises power supply V1, the first resistance R1 and inverter U1; The minus earth of described power supply V1, the positive pole of described power supply V1 connects one end of the first resistance R1 and the power positive end of inverter U1, the other end of described first resistance R1 is the input of the input of described electrical level shift units 310, the output of connection detection module 60 and inverter U1, the power supply negative terminal ground connection of described inverter U1, the output of described inverter U1 is the output of described electrical level shift units 310, the grid connecting the first metal-oxide-semiconductor Q1.The conversion voltage that detection module 60 exports being carried out to voltage domain is realized by power supply V1, the first resistance R1 and inverter U1, very practical.
Refer to Fig. 8, described detection module 60 comprises the second resistance R2, the 3rd resistance R3, the first reference voltage source V2, the second metal-oxide-semiconductor Q2 and comparator U2; One end of described second resistance R2 be detection module 60 first input end 1, connect the input of constant-current source module 70 and the negative pole of LED string 50, the other end of described second resistance R2 connects the normal phase input end of comparator U2, also by the 3rd resistance R3 ground connection; The positive pole of described first reference voltage source V2 connects the inverting input of comparator U2, the negative pole of described first reference voltage source V2 is the second input 2 of detection module 60, the minus earth of described first reference voltage source V2, the output of described comparator U2 connects the grid of the second metal-oxide-semiconductor Q2, the source ground of described second metal-oxide-semiconductor Q2, the drain electrode of described second metal-oxide-semiconductor Q2 is the output of described detection module 60, connects described switch control unit 320.
Refer to Fig. 9, described constant-current source module 70 comprises the 4th resistance R4, the second reference voltage source V3, the 3rd metal-oxide-semiconductor Q3 and operational amplifier U3; The drain electrode of described 3rd metal-oxide-semiconductor Q3 be described constant-current source module 70 input, connect the external LED lamp article negative pole of 50 and one end of described second resistance R2, the source electrode of described 3rd metal-oxide-semiconductor Q3 connect described operational amplifier U3 inverting input, also by the 4th resistance R4 ground connection, the normal phase input end of the positive pole concatenation operation amplifier U3 of described second reference voltage source V3, the minus earth of described second reference voltage source V3.
In another embodiment of the present utility model, as shown in Figure 10, its principle is identical with a upper embodiment for the described structured flowchart reducing the linear constant current LED drive device of wick quantity, and only the connected mode of modules is different, does not repeat them here.
Refer to Figure 11, in other embodiments that the utility model provides, what detection module detected is the output voltage of rectifier bridge, therefore, accordingly, the voltage difference at the constant-current source module two ends in a upper embodiment, in the process of control switch module, is changed into the output voltage of rectifier bridge by control module.That is, control module, for the voltage difference at switch module two ends lower than first threshold voltage Vth1 and the output voltage of rectifier bridge lower than the 3rd threshold voltage vt h3 time, the conducting of control switch module makes energy-storage travelling wave tube charge; Voltage difference at switch module two ends higher than first threshold voltage Vth1, or the output voltage of rectifier bridge higher than the 3rd threshold voltage vt h3 time, control switch module disconnect make energy-storage travelling wave tube to LED statements based on collusion electricity.Described 3rd threshold voltage vt h3 sets as required.Because other operation principles in embodiment illustrated in fig. 11 are identical with a upper embodiment, do not repeat them here.
Be understandable that; for those of ordinary skills; can be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the utility model.
Claims (10)
1. can reduce a linear constant current LED drive device for wick quantity, it is characterized in that, comprise rectification module, energy-storage travelling wave tube, switch module, constant-current source module, detection module and control module;
Described rectification module carries out rectification to the alternating current that outside inputs and acts in collusion to make each other's confessions electric to described energy-storage travelling wave tube and LED; Described switch module controls the discharge and recharge of described energy-storage travelling wave tube and the power supply of LED string by the break-make of self; Described constant-current source module makes the constant current hold of LED string; Described detection module detects the voltage difference at constant-current source module two ends, and the voltage difference of detection is exported to described control module; The voltage difference of described control module at switch module two ends lower than first threshold voltage and the voltage difference at constant-current source module two ends lower than Second Threshold voltage time, the conducting of control switch module make rectification module to energy-storage travelling wave tube charging and to LED statements based on collusion electricity; Voltage difference at switch module two ends higher than first threshold voltage, or the voltage difference at constant-current source module two ends higher than Second Threshold voltage time, control switch module disconnect make energy-storage travelling wave tube to LED statements based on collusion electricity.
2. the linear constant current LED drive device reducing wick quantity according to claim 1, it is characterized in that, described drive unit also comprises: for forward conduction, the one-way conduction module preventing energy-storage travelling wave tube from leaking electricity; Described switch module is by one end of one-way conduction model calling energy-storage travelling wave tube and the positive pole of LED string.
3. the linear constant current LED drive device reducing wick quantity according to claim 2, is characterized in that, the ceiling voltage that when described first threshold voltage is the unlatching of described switch module, two ends can be born.
4. the linear constant current LED drive device reducing wick quantity according to claim 3, it is characterized in that, described control module comprises:
Voltage for being exported by detection module carries out level shift, and the voltage shifts that detection module is exported is to the electrical level shift units of the voltage domain of switch module;
For the switching voltage detecting unit of the size of the voltage difference at sense switch module two ends, the voltage difference comparing switch module two ends and first threshold voltage;
For the voltage difference at switch module two ends lower than first threshold voltage and the voltage difference at constant-current source module two ends lower than Second Threshold voltage time, the conducting of control switch module makes energy-storage travelling wave tube charge; Voltage difference at switch module two ends higher than first threshold voltage, or the voltage difference at constant-current source module two ends higher than Second Threshold voltage time, control switch module disconnect make energy-storage travelling wave tube stop charging switch control unit.
5. the linear constant current LED drive device reducing wick quantity according to claim 4, it is characterized in that, described switch module comprises the first metal-oxide-semiconductor, the drain electrode of described first metal-oxide-semiconductor connects the output of rectification module, the source electrode of described first metal-oxide-semiconductor connects the positive pole of one-way conduction module, and the grid of described first metal-oxide-semiconductor is the control signal input of described switch module, connects described switch control unit.
6. the linear constant current LED drive device reducing wick quantity according to claim 5, is characterized in that, described electrical level shift units comprises power supply, the first resistance and inverter; The minus earth of described power supply, the positive pole of described power supply connects one end of the first resistance and the power positive end of inverter, the other end of described first resistance is the input of the input of described electrical level shift units, the output of connection detection module and inverter, the power supply negative terminal ground connection of described inverter, the output of described inverter is the output of described electrical level shift units, the grid connecting the first metal-oxide-semiconductor.
7. the linear constant current LED drive device reducing wick quantity according to claim 6, is characterized in that, described detection module comprises the second resistance, the 3rd resistance, the first reference voltage source, the second metal-oxide-semiconductor and comparator; One end of described second resistance be detection module input, connect the input of constant-current source module and the negative pole of LED string, the other end of described second resistance connects the normal phase input end of comparator, also by the 3rd grounding through resistance; The positive pole of described first reference voltage source connects the inverting input of comparator, the minus earth of described first reference voltage source, the output of described comparator connects the grid of the second metal-oxide-semiconductor, the source ground of described second metal-oxide-semiconductor, the drain electrode of described second metal-oxide-semiconductor is the output of described detection module, connects described switch control unit.
8. the linear constant current LED drive device reducing wick quantity according to claim 7, is characterized in that, described constant-current source module comprises the 4th resistance, the second reference voltage source, the 3rd metal-oxide-semiconductor and operational amplifier; The drain electrode of described 3rd metal-oxide-semiconductor be described constant-current source module input, connect the negative pole of external LED lamp article and one end of described second resistance, the source electrode of described 3rd metal-oxide-semiconductor connect described operational amplifier inverting input, also by the 4th grounding through resistance, the normal phase input end of the positive pole concatenation operation amplifier of described second reference voltage source, the minus earth of described second reference voltage source.
9. the linear constant current LED drive device reducing wick quantity according to claim 8, it is characterized in that, described energy-storage travelling wave tube comprises electric capacity.
10. the linear constant current LED drive device reducing wick quantity according to claim 9, is characterized in that, described one-way conduction module comprises diode, and described switch module connects one end of energy-storage travelling wave tube and the positive pole of LED string by described diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520422607.9U CN204859619U (en) | 2015-06-18 | 2015-06-18 | Can reduce linear constant current LED drive arrangement of wick quantity |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016202061A1 (en) * | 2015-06-18 | 2016-12-22 | 深圳市晟碟半导体有限公司 | Linear constant current led drive device capable of driving reduced number of leds |
| CN109445506A (en) * | 2018-12-26 | 2019-03-08 | 长春工程学院 | A kind of Portable voltage following-up type constant current source module |
| CN109491441A (en) * | 2018-12-26 | 2019-03-19 | 吉林大学 | A kind of loaded self-adaptive constant current source module |
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2015
- 2015-06-18 CN CN201520422607.9U patent/CN204859619U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016202061A1 (en) * | 2015-06-18 | 2016-12-22 | 深圳市晟碟半导体有限公司 | Linear constant current led drive device capable of driving reduced number of leds |
| US10292236B2 (en) | 2015-06-18 | 2019-05-14 | Shenzhen Sendis Semiconductor Co., Ltd | Linear constant current LED drive device capable of driving reduced number of LEDs |
| CN109445506A (en) * | 2018-12-26 | 2019-03-08 | 长春工程学院 | A kind of Portable voltage following-up type constant current source module |
| CN109491441A (en) * | 2018-12-26 | 2019-03-19 | 吉林大学 | A kind of loaded self-adaptive constant current source module |
| CN109445506B (en) * | 2018-12-26 | 2023-09-01 | 长春工程学院 | Portable voltage tracking type constant current source module |
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