CN203289688U - High-voltage LED lamp bead driving power supply controlled by sectional type sinusoidal current - Google Patents
High-voltage LED lamp bead driving power supply controlled by sectional type sinusoidal current Download PDFInfo
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- CN203289688U CN203289688U CN2013200079936U CN201320007993U CN203289688U CN 203289688 U CN203289688 U CN 203289688U CN 2013200079936 U CN2013200079936 U CN 2013200079936U CN 201320007993 U CN201320007993 U CN 201320007993U CN 203289688 U CN203289688 U CN 203289688U
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Abstract
A high-voltage LED lamp bead driving power supply controlled by a sectional type sinusoidal current is composed of a rectifying circuit 1 and a multi-channel current driving circuit 2. The high-voltage LED lamp bead driving power supply controlled by the sectional type sinusoidal current is simple in structure, low in cost, high in power factor, small in total harmonic distortion, and capable of achieving LED driving current with a sinusoidal wave shape, and is applicable for general illumination and application of high-voltage LED lamp beads of small power (watt stage).
Description
Technical field
The utility model relates to AC-DC (AC-DC) converter, is applied to high-voltage LED lamp pearl driving power, the high-voltage LED lamp pearl driving power that especially a kind of segmented sinusoidal current is controlled.
Background technology
The main cause that high pressure (little electric current) LED lamp pearl efficiency is better than conventional low (large electric current) LED lamp pearl is that the design of little electric current, multiple grain can be come current spread equably, and then promotes the light extraction efficiency.At present, high-voltage LED lamp pearl and driving power thereof have become the Hot spots for development in the LED Lighting Industry.
With regard to feasible high-voltage LED lamp pearl drive scheme, industry generally believes that without alminium electrolytic condenser, noninductive high-voltage LED Linear Driving scheme be preferred plan at present, it is reported that existing corresponding high-voltage LED Linear Driving chip appears on the market.But at present the desirable high-voltage LED Linear Driving chip price of performance is too high, is used for producing high-voltage LED lamp pearl driving power and general LED lighting light fixture and can causes high expensive, is unfavorable for popularizing of technology.
For solving also high deficiency of the high but cost of existing high-voltage LED Linear Driving scheme performance, the high-voltage LED lamp pearl driving power that the utility model provides a kind of low cost and high performance segmented sinusoidal current to control.
The technical scheme that its technical problem that solves the utility model adopts is: the high-voltage LED lamp pearl driving power that a kind of segmented sinusoidal current is controlled is comprised of rectification circuit 1 and multi channel currents drive circuit 2.rectification circuit 1 is by capacitor C 1, capacitor C 2, diode D1, diode D2, diode D3, diode D4 forms, capacitor C 1 is in parallel with AC power vac, one end of capacitor C 1 is connected with the negative electrode of the anode of diode D1 and diode D2, the other end of capacitor C 1 is connected with the anode of diode D3 and the negative electrode of diode D4, the negative electrode of the negative electrode of diode D1 and diode D3, one end of capacitor C 2, the anode of the LED string G1 of the anode of the output voltage vdc of rectification circuit 1 and high-voltage LED lamp pearl is connected, the anode of the anode of diode D2 and diode D4, the other end of capacitor C 2, the negative terminal of the output voltage vdc of node Gnd and rectification circuit 1 is connected.
Multi channel currents drive circuit 2 is comprised of n single channel current drive circuit.as preferred a kind of scheme: single channel current drive circuit 2.j(j=1, n-1) by NPN type triode Qj, n-j NPN type triode Qchj.j+1 to Qchj.n, resistance R j.1, resistance R j.2, n-j resistance R chj.j+1 to Rchj.n forms, the anode of the anode of a resistance R end j.1 and the output voltage vdc of rectification circuit 1 and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end j.1 is connected with the base stage of NPN type triode Qj and the collector electrode of NPN type triode Qchj.j+1 to Qchj.n, the anode of the LED string Gj+1 of the negative electrode of the collector electrode of NPN type triode Qj and the LED of high-voltage LED lamp pearl string Gj and high-voltage LED lamp pearl is connected, the emitter of NPN type triode Qj and resistance R j.2 an end and the anode of voltage vrj be connected, the resistance R other end j.2 and the negative terminal of voltage vrj, the emitter of NPN type triode Qchj.j+1 to Qchj.n and node Gnd are connected, the base stage of NPN type triode Qchj.j+1 to Qchj.n is connected with the end of resistance R chj.j+1 to Rchj.n respectively, the other end of resistance R chj.j+1 to Rchj.n is connected with the anode of the voltage vrj+1 of the single channel current drive circuit 2.j+1 anode to the voltage vrn of single channel current drive circuit 2.n respectively,
Single channel current drive circuit 2.n by NPN type triode Qn, resistance R n.1, n.2 resistance R form, the anode of the anode of a resistance R end n.1 and the output voltage vdc of rectification circuit 1 and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end n.1 is connected with the base stage of NPN type triode Qn, the collector electrode of NPN type triode Qn is connected with the negative electrode of the LED of high-voltage LED lamp pearl string Gn, the emitter of NPN type triode Qn and resistance R n.2 an end and the anode of voltage vrn be connected, the resistance R other end n.2 is connected with negative terminal and the node Gnd of voltage vrn.
as preferred another kind of scheme: single channel current drive circuit 2.j(j=1, n-1) by NPN type triode Qj, NPN type triode Qchj, n-j diode Dchj.j+1 to Dchj.n, resistance R j.1, resistance R j.2, resistance R chj forms, the anode of the anode of a resistance R end j.1 and the output voltage vdc of rectification circuit 1 and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end j.1 and the base stage of NPN type triode Qj, the collector electrode of NPN type triode Qchj is connected, the anode of the LED string Gj+1 of the negative electrode of the collector electrode of NPN type triode Qj and the LED of high-voltage LED lamp pearl string Gj and high-voltage LED lamp pearl is connected, the emitter of NPN type triode Qj and resistance R j.2 an end and the anode of voltage vrj be connected, the resistance R other end j.2 and the negative terminal of voltage vrj, the emitter of NPN type triode Qchj and node Gnd are connected, the base stage of NPN type triode Qchj is connected with the end of resistance R chj, the other end of resistance R chj is connected with the negative electrode of diode Dchj.j+1 to Dchj.n, the anode of diode Dchj.j+1 to Dchj.n is connected with the anode of the voltage vrj+1 of the single channel current drive circuit 2.j+1 anode to the voltage vrn of single channel current drive circuit 2.n respectively,
Single channel current drive circuit 2.n by NPN type triode Qn, resistance R n.1, n.2 resistance R form, the anode of the anode of a resistance R end n.1 and the output voltage vdc of rectification circuit 1 and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end n.1 is connected with the base stage of NPN type triode Qn, the collector electrode of NPN type triode Qn is connected with the negative electrode of the LED of high-voltage LED lamp pearl string Gn, the emitter of NPN type triode Qn and resistance R n.2 an end and the anode of voltage vrn be connected, the resistance R other end n.2 is connected with negative terminal and the node Gnd of voltage vrn.
further, as preferred a kind of scheme: described single channel current drive circuit 2.k(k=1, n) also comprise overvoltage crowbar, described overvoltage crowbar is by resistance R vk.1, resistance R vk.2, resistance R vk.3, NPN type triode Qvk forms, the end of resistance R vk.1 is connected with the collector electrode of NPN type triode Qk, the other end of resistance R vk.1 is connected with the end of resistance R vk.2 and the end of resistance R vk.3, the other end of resistance R vk.2 is connected with the emitter of node Gnd and NPN type triode Qvk, the other end of resistance R vk.3 is connected with the base stage of NPN type triode Qvk, the collector electrode of NPN type triode Qvk is connected with the base stage of NPN type triode Qk.
perhaps, as preferred another kind of scheme: described single channel current drive circuit 2.k(k=1, n) also comprise current foldback circuit, described current foldback circuit is by resistance R ck.1, resistance R ck.2, resistance R ck.3, NPN type triode Qck forms, the end of resistance R ck.1 is connected with the emitter of NPN type triode Qk and the anode of voltage vrk, the other end of resistance R ck.1 is connected with the end of resistance R ck.2 and the end of resistance R ck.3, the other end of resistance R ck.2 is connected with the emitter of node Gnd and NPN type triode Qck, the other end of resistance R ck.3 is connected with the base stage of NPN type triode Qck, the collector electrode of NPN type triode Qck is connected with the base stage of NPN type triode Qk.
Or, as preferred another kind of scheme: described single channel current drive circuit 2.k(k=1, n) also comprise the PWM light adjusting circuit, described PWM light adjusting circuit is comprised of NPN type triode Qsk and resistance R sk, the collector electrode of NPN type triode Qsk is connected with the base stage of NPN type triode Qk, the base stage of NPN type triode Qsk is connected with the end of resistance R sk, the other end of resistance R sk is connected with the anode of pulse voltage source vpwm, and the emitter of NPN type triode Qsk is connected with the negative terminal of node Gnd and pulse voltage source vpwm.
Technical conceive of the present utility model is: only adopt diode, triode, resistance, non-electrolytic capacitor to make the high-voltage LED lamp pearl driving power (as depicted in figs. 1 and 2) of a kind of low cost and the control of high performance segmented sinusoidal current.The high-voltage LED lamp pearl driving power that the segmented sinusoidal current is controlled is comprised of rectification circuit 1 and multi channel currents drive circuit 2, and multi channel currents drive circuit 2 is comprised of n single channel current drive circuit again.a kind of single channel current drive circuit 2.j(j=1, n-1) by NPN type triode Qj, n-j NPN type triode Qchj.j+1 to Qchj.n, resistance R j.1, resistance R j.2, n-j resistance R chj.j+1 to Rchj.n forms, its feature is as follows: the anode of the anode of a resistance R end j.1 and the output voltage vdc of rectification circuit 1 and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end j.1 is connected with the base stage of NPN type triode Qj and the collector electrode of NPN type triode Qchj.j+1 to Qchj.n, the anode of the LED string Gj+1 of the negative electrode of the collector electrode of NPN type triode Qj and the LED of high-voltage LED lamp pearl string Gj and high-voltage LED lamp pearl is connected, the emitter of NPN type triode Qj and resistance R j.2 an end and the anode of voltage vrj be connected, the resistance R other end j.2 and the negative terminal of voltage vrj, the emitter of NPN triode Qchj.j+1 to Qchj.n and node Gnd are connected, the base stage of NPN type triode Qchj.j+1 to Qchj.n is connected with the end of resistance R chj.j+1 to Rchj.n respectively, the other end of resistance R chj.j+1 to Rchj.n is connected with the anode of the voltage vrj+1 of the single channel current drive circuit 2.j+1 anode to the voltage vrn of single channel current drive circuit 2.n respectively.
another kind of single channel current drive circuit 2.j(j=1, n-1) by NPN type triode Qj, NPN type triode Qchj, n-j diode Dchj.j+1 to Dchj.n, resistance R j.1, resistance R j.2, resistance R chj forms, its feature is as follows: the anode of the anode of a resistance R end j.1 and the output voltage vdc of rectification circuit 1 and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end j.1 is connected with the base stage of NPN type triode Qj and the collector electrode of NPN type triode Qchj, the anode of the LED string Gj+1 of the negative electrode of the collector electrode of NPN type triode Qj and the LED of high-voltage LED lamp pearl string Gj and high-voltage LED lamp pearl is connected, the emitter of NPN type triode Qj and resistance R j.2 an end and the anode of voltage vrj be connected, the resistance R other end j.2 and the negative terminal of voltage vrj, the emitter of NPN type triode Qchj and node Gnd are connected, the base stage of NPN type triode Qchj is connected with the end of resistance R chj, the other end of resistance R chj is connected with the negative electrode of diode Dchj.j+1 to Dchj.n, the anode of diode Dchj.j+1 to Dchj.n is connected with the anode of the voltage vrj+1 of the single channel current drive circuit 2.j+1 anode to the voltage vrn of single channel current drive circuit 2.n respectively.
a kind of single channel current drive circuit 2.n is by NPN type triode Qn, resistance R n.1, n.2, resistance R forms, its feature is as follows: the anode of the anode of a resistance R end n.1 and the output voltage vdc of rectification circuit 1 and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end n.1 is connected with the base stage of NPN type triode Qn, the collector electrode of NPN type triode Qn is connected with the negative electrode of the LED of high-voltage LED lamp pearl string Gn, the emitter of NPN type triode Qn and resistance R n.2 an end and the anode of voltage vrn be connected, the resistance R other end n.2 is connected with negative terminal and the node Gnd of voltage vrn.
For obtaining over-voltage protecting function, in single channel current drive circuit 2.k(k=1 ..., can increase overvoltage crowbar in n), form (seeing Fig. 1 and Fig. 2) by resistance R vk.1, resistance R vk.2, resistance R vk.3, NPN type triode Qvk.
For obtaining overcurrent protection function, in single channel current drive circuit 2.k(k=1 ..., can increase current foldback circuit in n), form (seeing Fig. 1 and Fig. 2) by resistance R ck.1, resistance R ck.2, resistance R ck.3, NPN type triode Qck.
For obtaining the PWM dimming function, in single channel current drive circuit 2.k(k=1 ..., can increase the PWM light adjusting circuit in n), form (seeing Fig. 1 and Fig. 2) by NPN type triode Qsk and resistance R sk.
The beneficial effects of the utility model are mainly manifested in: the high-voltage LED lamp pearl driving power that the segmented sinusoidal current that the utility model proposes is controlled has advantages of that circuit structure is simple, cost is low, can realize sine-shaped LED drive current, power factor is high, the total harmonic distortion degree is little, is fit to very much the high-voltage LED lamp pearl general illumination application of small-power (several watts of levels).
Description of drawings
Fig. 1 is the circuit diagram of the high-voltage LED lamp pearl driving power embodiment 1 of segmented sinusoidal current control.
Fig. 2 is the circuit diagram of the high-voltage LED lamp pearl driving power embodiment 2 of segmented sinusoidal current control.
Fig. 3 is the high-voltage LED lamp pearl driving power embodiment 1 of segmented sinusoidal current control and embodiment 2 works under non-PWM light modulation condition ideal waveform figure.
Fig. 4 is the high-voltage LED lamp pearl driving power embodiment 1 that controls of segmented sinusoidal current and the embodiment 2 ideal waveform figure during overvoltage protection under non-PWM light modulation condition.
Fig. 5 is the high-voltage LED lamp pearl driving power embodiment 1 that controls of segmented sinusoidal current and the embodiment 2 ideal waveform figure during overcurrent protection under non-PWM light modulation condition.
Fig. 6 is the high-voltage LED lamp pearl driving power embodiment 1 of segmented sinusoidal current control and embodiment 2 works under PWM light modulation condition ideal waveform figure.
Fig. 7 is the high-voltage LED lamp pearl driving power embodiment 1 that controls of segmented sinusoidal current and the embodiment 2 ideal waveform figure during overvoltage protection under PWM light modulation condition.
Fig. 8 is the high-voltage LED lamp pearl driving power embodiment 1 that controls of segmented sinusoidal current and the embodiment 2 ideal waveform figure during overcurrent protection under PWM light modulation condition.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
With reference to Fig. 1, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, the high-voltage LED lamp pearl driving power embodiment 1 that the segmented sinusoidal current is controlled is comprised of rectification circuit 1 and multi channel currents drive circuit 2.rectification circuit 1 is by capacitor C 1, capacitor C 2, diode D1, diode D2, diode D3, diode D4 forms, capacitor C 1 is in parallel with AC power vac, one end of capacitor C 1 is connected with the negative electrode of the anode of diode D1 and diode D2, the other end of capacitor C 1 is connected with the anode of diode D3 and the negative electrode of diode D4, the negative electrode of the negative electrode of diode D1 and diode D3, one end of capacitor C 2, the anode of the LED string G1 of the anode of the output voltage vdc of rectification circuit 1 and high-voltage LED lamp pearl is connected, the anode of the anode of diode D2 and diode D4, the other end of capacitor C 2, the negative terminal of the output voltage vdc of node Gnd and rectification circuit 1 is connected.
Multi channel currents drive circuit 2 is comprised of n single channel current drive circuit.single channel current drive circuit 2.j(j=1, n-1) by NPN type triode Qj, n-j NPN type triode Qchj.j+1 to Qchj.n, resistance R j.1, resistance R j.2, n-j resistance R chj.j+1 to Rchj.n forms, the anode of the anode of a resistance R end j.1 and the output voltage vdc of rectification circuit 1 and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end j.1 and the base stage of NPN type triode Qj, the collector electrode of NPN type triode Qchj.j+1 to Qchj.n is connected, the anode of the LED string Gj+1 of the negative electrode of the collector electrode of NPN type triode Qj and the LED of high-voltage LED lamp pearl string Gj and high-voltage LED lamp pearl is connected, the emitter of NPN type triode Qj and resistance R j.2 an end and the anode of voltage vrj be connected, the resistance R other end j.2 and the negative terminal of voltage vrj, the emitter of NPN type triode Qchj.j+1 to Qchj.n and node Gnd are connected, the base stage of NPN type triode Qchj.j+1 to Qchj.n is connected with the end of resistance R chj.j+1 to Rchj.n respectively, the other end of resistance R chj.j+1 to Rchj.n is connected with the anode of the voltage vrj+1 of the single channel current drive circuit 2.j+1 anode to the voltage vrn of single channel current drive circuit 2.n respectively,
Single channel current drive circuit 2.n by NPN type triode Qn, resistance R n.1, n.2 resistance R form, the anode of the anode of a resistance R end n.1 and the output voltage vdc of rectification circuit 1 and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end n.1 is connected with the base stage of NPN type triode Qn, the collector electrode of NPN type triode Qn is connected with the negative electrode of the LED of high-voltage LED lamp pearl string Gn, the emitter of NPN type triode Qn and resistance R n.2 an end and the anode of voltage vrn be connected, the resistance R other end n.2 is connected with negative terminal and the node Gnd of voltage vrn.
single channel current drive circuit 2.k(k=1, n) also comprise overvoltage crowbar, by resistance R vk.1, resistance R vk.2, resistance R vk.3, NPN triode Qvk forms, the end of resistance R vk.1 is connected with the collector electrode of NPN type triode Qk, the other end of resistance R vk.1 is connected with the end of resistance R vk.2 and the end of resistance R vk.3, the other end of resistance R vk.2 is connected with the emitter of node Gnd and NPN type triode Qvk, the other end of resistance R vk.3 is connected with the base stage of NPN type triode Qvk, the collector electrode of NPN type triode Qvk is connected with the base stage of NPN type triode Qk.
described single channel current drive circuit 2.k(k=1, n) also comprise current foldback circuit, described overvoltage crowbar is by resistance R ck.1, resistance R ck.2, resistance R ck.3, NPN type triode Qck forms, the end of resistance R ck.1 is connected with the emitter of NPN type triode Qk and the anode of voltage vrk, the other end of resistance R ck.1 is connected with the end of resistance R ck.2 and the end of resistance R ck.3, the other end of resistance R ck.2 is connected with the emitter of node Gnd and NPN type triode Qck, the other end of resistance R ck.3 is connected with the base stage of NPN type triode Qck, the collector electrode of NPN type triode Qck is connected with the base stage of NPN type triode Qk.
Single channel current drive circuit 2.k(k=1, n) also comprise the PWM light adjusting circuit, formed by NPN type triode Qsk and resistance R sk, the collector electrode of NPN type triode Qsk is connected with the base stage of NPN type triode Qk, the base stage of NPN type triode Qsk is connected with the end of resistance R sk, and the other end of resistance R sk is connected with the anode of pulse voltage source vpwm, and the emitter of NPN type triode Qsk is connected with the negative terminal of node Gnd and pulse voltage source vpwm.
Fig. 3 is the high-voltage LED lamp pearl driving power embodiment 1 of segmented sinusoidal current control works under non-PWM light modulation condition ideal waveform figure.Fig. 4 is the high-voltage LED lamp pearl driving power embodiment 1 that controls of segmented sinusoidal current ideal waveform figure during overvoltage protection under non-PWM light modulation condition.Fig. 5 is the high-voltage LED lamp pearl driving power embodiment 1 that controls of segmented sinusoidal current ideal waveform figure during overcurrent protection under non-PWM light modulation condition.Fig. 6 is the high-voltage LED lamp pearl driving power embodiment 1 of segmented sinusoidal current control works under PWM light modulation condition ideal waveform figure.Fig. 7 is the high-voltage LED lamp pearl driving power embodiment 1 that controls of segmented sinusoidal current ideal waveform figure during overvoltage protection under PWM light modulation condition.Fig. 8 is the high-voltage LED lamp pearl driving power embodiment 1 that controls of segmented sinusoidal current ideal waveform figure during overcurrent protection under PWM light modulation condition.
The output voltage of known rectification circuit 1 is vdc, NPN type triode Qk(k=1, n) basic emitter-base bandgap grading conduction voltage drop is Vbek, and the collector electrode of Qk is vchk to the voltage of node Gnd, and the DC current gain of Qk is β k, resistance R k.2 both end voltage is vrk, the conduction voltage drop of LED string Gk is Vk, and the operating voltage of LED string Gk is vk, and the total working voltage of high-voltage LED lamp pearl is vLED.Its circuit working principle is specific as follows:
(1) normal operation under non-PWM light modulation condition (be pulse voltage source vpwm be output as 0 and overvoltage detect voltage vchkRvk.2/ (Rvk.1+Rvk.2) less than the basic emitter-base bandgap grading conduction voltage drop of NPN type triode Qvk and over-current detection voltage vrkRck.2/ (Rck.1+Rck.2) the basic emitter-base bandgap grading conduction voltage drop less than NPN type triode Qck): when 0≤vdc＜V1, LED string G1 to Gn all ends, is not lit.When V1≤vdc＜V1+V2, LED string G1 conducting, be lit, but LED string G2 to Gn all ends, is not lit, the operating current i1 ≈ of LED string G1 | vac| β 1/ (R1.1+R1.2+ β 1R1.2), the operating voltage v1 of LED string G1=V1, total working voltage vLED=vdc of high-voltage LED lamp pearl.work as V1+ ... + Vm≤vdc＜V1+ ... + Vm+1(m=2, n-1) time, LED string G1 to Gm conducting, be lit, LED string Gm+1 to Gn all ends, be not lit, because of voltage vrm(≈ imRm.2) greater than the basic emitter-base bandgap grading conduction voltage drop of NPN type triode Qch1.m to Qchm-1.m, the equal conducting of Qch1.m to Qchm-1.m, NPN type triode Q1 to Qm-1 all ends, the operating current of LED string G1 to Gm is im ≈ | vac| β m/ (Rm.1+Rm.2+ β mRm.2), the operating voltage of LED string G1 to Gm is respectively V1 to Vm, total working voltage vLED=vdc of high-voltage LED lamp pearl.As vdc 〉=V1+ ... during+Vn, LED string G1 to Gn conducting, be lit, because of voltage vrn(≈ inRn.2) greater than the basic emitter-base bandgap grading conduction voltage drop of Qch1.n to Qchn-1.n, the equal conducting of NPN type triode Qch1.n to Qchn-1.n, NPN type triode Q1 to Qn-1 all ends, the operating current of LED string G1 to Gn is in ≈ | vac| β n/ (Rn.1+Rn.2+ β nRn.2), the operating voltage of LED string G1 to Gn is respectively V1 to Vn, total working voltage vLED=V1+ of high-voltage LED lamp pearl ... + Vn.
(2) the overvoltage protection work under non-PWM light modulation condition (be pulse voltage source vpwm be output as 0 and overvoltage detect voltage vchkRvk.2/ (Rvk.1+Rvk.2) and be equal to or greater than the basic emitter-base bandgap grading conduction voltage drop of NPN type triode Qvk and over-current detection voltage vrkRck.2/ (Rck.1+Rck.2) the basic emitter-base bandgap grading conduction voltage drop less than NPN type triode Qck): because of input voltage vac or commutating voltage vdc overvoltage, can cause vchkRvk.2/ (Rvk.1+Rvk.2) to be equal to or greater than the basic emitter-base bandgap grading conduction voltage drop of Qvk, cause the Qvk conducting, NPN type triode Qk cut-off, make the operating current ik of single channel current drive circuit 2.k=0.Remaining operating state is identical with the normal operating conditions under non-PWM light modulation condition.
(3) the overcurrent protection work under non-PWM light modulation condition (be pulse voltage source vpwm be output as 0 and overvoltage detect the basic emitter-base bandgap grading conduction voltage drop that voltage vchkRvk.2/ (Rvk.1+Rvk.2) is equal to or greater than NPN type triode Qck less than basic emitter-base bandgap grading conduction voltage drop and the over-current detection voltage vrkRck.2/ (Rck.1+Rck.2) of NPN type triode Qvk): when overcurrent occurs in the operating current ik of single channel current drive circuit 2.k, can cause vrkRck.2/ (Rck.1+Rck.2) to be equal to or greater than the basic emitter-base bandgap grading conduction voltage drop of Qck, cause the Qck conducting, shunt the base current of a part of NPN type triode Qk, thereby reduce ik.Remaining operating state is identical with the normal operating conditions under non-PWM light modulation condition.
(4) normal operation under PWM light modulation condition (be pulse voltage source vpwm be output as pulse and overvoltage detect voltage vchkRvk.2/ (Rvk.1+Rvk.2) less than the basic emitter-base bandgap grading conduction voltage drop of NPN type triode Qvk and over-current detection voltage vrkRck.2/ (Rck.1+Rck.2) the basic emitter-base bandgap grading conduction voltage drop less than NPN type triode Qck): when the pulse of pulse voltage source vpwm output is high level, NPN type triode Qs1 to Qsn conducting, cause NPN type triode Q1 to Qn to end, make LED string G1 to Gn entirely not be lit.When the pulse of pulse voltage source vpwm output was low level, its operating state was identical with the normal operating conditions under non-PWM light modulation condition.
(5) the overvoltage protection work under PWM light modulation condition (be pulse voltage source vpwm be output as pulse and overvoltage detect voltage vchkRvk.2/ (Rvk.1+Rvk.2) and be equal to or greater than the basic emitter-base bandgap grading conduction voltage drop of NPN type triode Qvk and over-current detection voltage vrkRck.2/ (Rck.1+Rck.2) the basic emitter-base bandgap grading conduction voltage drop less than NPN type triode Qck): when the pulse of pulse voltage source vpwm output is high level; NPN type triode Qs1 to Qsn conducting; cause NPN type triode Q1 to Qn to end, make LED string G1 to Gn entirely not be lit.When the pulse of pulse voltage source vpwm output was low level, its operating state was identical with the overvoltage protection operating state under non-PWM light modulation condition.
(6) the overcurrent protection work under PWM light modulation condition (be pulse voltage source vpwm be output as pulse and overvoltage detect the basic emitter-base bandgap grading conduction voltage drop that voltage vchkRvk.2/ (Rvk.1+Rvk.2) is equal to or greater than NPN type triode Qck less than basic emitter-base bandgap grading conduction voltage drop and the over-current detection voltage vrkRck.2/ (Rck.1+Rck.2) of NPN type triode Qvk): when the pulse of pulse voltage source vpwm output is high level; NPN type triode Qs1 to Qsn conducting; cause NPN type triode Q1 to Qn to end, make LED string G1 to Gn entirely not be lit.When the pulse of pulse voltage source vpwm output was low level, its operating state was identical with the overcurrent protection operating state under non-PWM light modulation condition.
With reference to Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, the high-voltage LED lamp pearl driving power embodiment 2 that the segmented sinusoidal current is controlled is comprised of rectification circuit 1 and multi channel currents drive circuit 2.rectification circuit 1 is by capacitor C 1, capacitor C 2, diode D1, diode D2, diode D3, diode D4 forms, capacitor C 1 is in parallel with AC power vac, one end of capacitor C 1 is connected with the negative electrode of the anode of diode D1 and diode D2, the other end of capacitor C 1 is connected with the anode of diode D3 and the negative electrode of diode D4, the negative electrode of the negative electrode of diode D1 and diode D3, one end of capacitor C 2, the anode of the LED string G1 of the anode of the output voltage vdc of rectification circuit 1 and high-voltage LED lamp pearl is connected, the anode of the anode of diode D2 and diode D4, the other end of capacitor C 2, the negative terminal of the output voltage vdc of node Gnd and rectification circuit 1 is connected.
single channel current drive circuit 2.j(j=1, n-1) by NPN type triode Qj, NPN type triode Qchj, n-j diode Dchj.j+1 to Dchj.n, resistance R j.1, resistance R j.2, resistance R chj forms, the anode of the anode of a resistance R end j.1 and the output voltage vdc of rectification circuit 1 and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end j.1 is connected with the base stage of NPN type triode Qj and the collector electrode of NPN type triode Qchj, the anode of the LED string Gj+1 of the negative electrode of the collector electrode of NPN type triode Qj and the LED of high-voltage LED lamp pearl string Gj and high-voltage LED lamp pearl is connected, the emitter of NPN type triode Qj and resistance R j.2 an end and the anode of voltage vrj be connected, the resistance R other end j.2 and the negative terminal of voltage vrj, the emitter of NPN type triode Qchj and node Gnd are connected, the base stage of NPN type triode Qchj is connected with the end of resistance R chj, the other end of resistance R chj is connected with the negative electrode of diode Dchj.j+1 to Dchj.n, the anode of diode Dchj.j+1 to Dchj.n is connected with the anode of the voltage vrj+1 of the single channel current drive circuit 2.j+1 anode to the voltage vrn of single channel current drive circuit 2.n respectively,
Single channel current drive circuit 2.n by NPN type triode Qn, resistance R n.1, n.2 resistance R form, the anode of the anode of a resistance R end n.1 and the output voltage vdc of rectification circuit 1 and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end n.1 is connected with the base stage of NPN type triode Qn, the collector electrode of NPN type triode Qn is connected with the negative electrode of the LED of high-voltage LED lamp pearl string Gn, the emitter of NPN type triode Qn and resistance R n.2 an end and the anode of voltage vrn be connected, the resistance R other end n.2 is connected with negative terminal and the node Gnd of voltage vrn.
Other circuit structures of the present embodiment are identical with embodiment 1.
Fig. 3 is the high-voltage LED lamp pearl driving power embodiment 2 of segmented sinusoidal current control works under non-PWM light modulation condition ideal waveform figure.Fig. 4 is the high-voltage LED lamp pearl driving power embodiment 2 that controls of segmented sinusoidal current ideal waveform figure during overvoltage protection under non-PWM light modulation condition.Fig. 5 is the high-voltage LED lamp pearl driving power embodiment 2 that controls of segmented sinusoidal current ideal waveform figure during overcurrent protection under non-PWM light modulation condition.Fig. 6 is the high-voltage LED lamp pearl driving power embodiment 2 of segmented sinusoidal current control works under PWM light modulation condition ideal waveform figure.Fig. 7 is the high-voltage LED lamp pearl driving power embodiment 2 that controls of segmented sinusoidal current ideal waveform figure during overvoltage protection under PWM light modulation condition.Fig. 8 is the high-voltage LED lamp pearl driving power embodiment 2 that controls of segmented sinusoidal current ideal waveform figure during overcurrent protection under PWM light modulation condition.Its circuit working principle is similar to embodiment 1, specific as follows:
(1) normal operation under non-PWM light modulation condition (be pulse voltage source vpwm be output as 0 and overvoltage detect voltage vchkRvk.2/ (Rvk.1+Rvk.2) less than the basic emitter-base bandgap grading conduction voltage drop of NPN type triode Qvk and over-current detection voltage vrkRck.2/ (Rck.1+Rck.2) the basic emitter-base bandgap grading conduction voltage drop less than NPN type triode Qck): when 0≤vdc＜V1, LED string G1 to Gn all ends, is not lit.When V1≤vdc＜V1+V2, LED string G1 conducting, be lit, but LED string G2 to Gn all ends, is not lit, the operating current i1 ≈ of LED string G1 | vac| β 1/ (R1.1+R1.2+ β 1R1.2), the operating voltage v1 of LED string G1=V1, total working voltage vLED=vdc of high-voltage LED lamp pearl.work as V1+ ... + Vm≤vdc＜V1+ ... + Vm+1(m=2, n-1) time, LED string G1 to Gm conducting, be lit, LED string Gm+1 to Gn all ends, be not lit, because of voltage vrm(≈ imRm.2) greater than the basic emitter-base bandgap grading conduction voltage drop sum of forward conduction voltage drop and the NPN type triode Qch1 to Qchm-1 of diode Dch1.m to Dchm-1.m, the equal conducting of Dch1.m to Dchm-1.m, the equal conducting of Qch1 to Qchm-1, NPN type triode Q1 to Qm-1 all ends, the operating current of LED string G1 to Gm is im ≈ | vac| β m/ (Rm.1+Rm.2+ β mRm.2), the operating voltage of LED string G1 to Gm is respectively V1 to Vm, total working voltage vLED=vdc of high-voltage LED lamp pearl.As vdc 〉=V1+ ... during+Vn, LED string G1 to Gn conducting, be lit, because of voltage vrn(≈ inRn.2) greater than the basic emitter-base bandgap grading conduction voltage drop sum of forward conduction voltage drop and the NPN type triode Qch1 to Qchn-1 of diode Dch1.n to Dchn-1.n, the equal conducting of Qch1 to Qchn-1, NPN type triode Q1 to Qn-1 all ends, the operating current of LED string G1 to Gn is in ≈ | vac| β n/ (Rn.1+Rn.2+ β nRn.2), the operating voltage of LED string G1 to Gn is respectively V1 to Vn, total working voltage vLED=V1+ of high-voltage LED lamp pearl ... + Vn.
(2) the overvoltage protection work under non-PWM light modulation condition (be pulse voltage source vpwm be output as 0 and overvoltage detect voltage vchkRvk.2/ (Rvk.1+Rvk.2) and be equal to or greater than the basic emitter-base bandgap grading conduction voltage drop of NPN type triode Qvk and over-current detection voltage vrkRck.2/ (Rck.1+Rck.2) the basic emitter-base bandgap grading conduction voltage drop less than NPN type triode Qck): because of input voltage vac or commutating voltage vdc overvoltage, can cause vchkRvk.2/ (Rvk.1+Rvk.2) to be equal to or greater than the basic emitter-base bandgap grading conduction voltage drop of Qvk, cause the Qvk conducting, NPN type triode Qk cut-off, make the operating current ik of single channel current drive circuit 2.k=0.Remaining operating state is identical with the normal operating conditions under non-PWM light modulation condition.
(3) the overcurrent protection work under non-PWM light modulation condition (be pulse voltage source vpwm be output as 0 and overvoltage detect the basic emitter-base bandgap grading conduction voltage drop that voltage vchkRvk.2/ (Rvk.1+Rvk.2) is equal to or greater than NPN type triode Qck less than basic emitter-base bandgap grading conduction voltage drop and the over-current detection voltage vrkRck.2/ (Rck.1+Rck.2) of NPN type triode Qvk): when overcurrent occurs in the operating current ik of single channel current drive circuit 2.k, can cause vrkRck.2/ (Rck.1+Rck.2) to be equal to or greater than the basic emitter-base bandgap grading conduction voltage drop of Qck, cause the Qck conducting, shunt the base current of a part of NPN type triode Qk, thereby reduce ik.Remaining operating state is identical with the normal operating conditions under non-PWM light modulation condition.
(4) normal operation under PWM light modulation condition (be pulse voltage source vpwm be output as pulse and overvoltage detect voltage vchkRvk.2/ (Rvk.1+Rvk.2) less than the basic emitter-base bandgap grading conduction voltage drop of NPN type triode Qvk and over-current detection voltage vrkRck.2/ (Rck.1+Rck.2) the basic emitter-base bandgap grading conduction voltage drop less than NPN type triode Qck): when the pulse of pulse voltage source vpwm output is high level, NPN type triode Qs1 to Qsn conducting, cause NPN type triode Q1 to Qn to end, make LED string G1 to Gn entirely not be lit.When the pulse of pulse voltage source vpwm output was low level, its operating state was identical with the normal operating conditions under non-PWM light modulation condition.
(5) the overvoltage protection work under PWM light modulation condition (be pulse voltage source vpwm be output as pulse and overvoltage detect voltage vchkRvk.2/ (Rvk.1+Rvk.2) and be equal to or greater than the basic emitter-base bandgap grading conduction voltage drop of NPN type triode Qvk and over-current detection voltage vrkRck.2/ (Rck.1+Rck.2) the basic emitter-base bandgap grading conduction voltage drop less than NPN type triode Qck): when the pulse of pulse voltage source vpwm output is high level; NPN type triode Qs1 to Qsn conducting; cause NPN type triode Q1 to Qn to end, make LED string G1 to Gn entirely not be lit.When the pulse of pulse voltage source vpwm output was low level, its operating state was identical with the overvoltage protection operating state under non-PWM light modulation condition.
(6) the overcurrent protection work under PWM light modulation condition (be pulse voltage source vpwm be output as pulse and overvoltage detect the basic emitter-base bandgap grading conduction voltage drop that voltage vchkRvk.2/ (Rvk.1+Rvk.2) is equal to or greater than NPN type triode Qck less than basic emitter-base bandgap grading conduction voltage drop and the over-current detection voltage vrkRck.2/ (Rck.1+Rck.2) of NPN type triode Qvk): when the pulse of pulse voltage source vpwm output is high level; NPN type triode Qs1 to Qsn conducting; cause NPN type triode Q1 to Qn to end, make LED string G1 to Gn entirely not be lit.When the pulse of pulse voltage source vpwm output was low level, its operating state was identical with the overcurrent protection operating state under non-PWM light modulation condition.
The described content of this specification embodiment is only enumerating the way of realization of utility model design; protection range of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection range of the present utility model also reaches the equivalent technologies means that design can be expected according to the utility model in those skilled in the art.
Claims (5)
1. the high-voltage LED lamp pearl driving power controlled of a segmented sinusoidal current, formed by rectification circuit (1) and multi channel currents drive circuit (2), described multi channel currents drive circuit (2) is comprised of n single channel current drive circuit again, it is characterized in that: described single channel current drive circuit 2.j, j=1, n-1, by NPN type triode Qj, n-j NPN type triode Qchj.j+1 to Qchj.n, resistance R j.1, resistance R j.2, n-j resistance R chj.j+1 to Rchj.n forms, the anode of the anode of a resistance R end j.1 and the output voltage vdc of rectification circuit 1 and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end j.1 is connected with the base stage of NPN type triode Qj and the collector electrode of NPN type triode Qchj.j+1 to Qchj.n, the anode of the LED string Gj+1 of the negative electrode of the collector electrode of NPN type triode Qj and the LED of high-voltage LED lamp pearl string Gj and high-voltage LED lamp pearl is connected, the emitter of NPN type triode Qj and resistance R j.2 an end and the anode of voltage vrj be connected, the resistance R other end j.2 and the negative terminal of voltage vrj, the emitter of NPN type triode Qchj.j+1 to Qchj.n and node Gnd are connected, the base stage of NPN type triode Qchj.j+1 to Qchj.n is connected with the end of resistance R chj.j+1 to Rchj.n respectively, the other end of resistance R chj.j+1 to Rchj.n is connected with the anode of the voltage vrj+1 of the single channel current drive circuit 2.j+1 anode to the voltage vrn of single channel current drive circuit (2.n) respectively,
described single channel current drive circuit (2.n) is by NPN type triode Qn, resistance R n.1, n.2, resistance R forms, the anode of the anode of a resistance R end n.1 and the output voltage vdc of rectification circuit 1 and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end n.1 is connected with the base stage of NPN type triode Qn, the collector electrode of NPN type triode Qn is connected with the negative electrode of the LED of high-voltage LED lamp pearl string Gn, the emitter of NPN type triode Qn and resistance R n.2 an end and the anode of voltage vrn be connected, the resistance R other end n.2 is connected with negative terminal and the node Gnd of voltage vrn.
2. driving power as claimed in claim 1, it is characterized in that: single channel current drive circuit 2.j, j=1, n-1, in n-j NPN type triode Qchj.j+1 to Qchj.n and n-j resistance R chj.j+1 to Rchj.n can be by NPN type triode Qchj, n-j diode Dchj.j+1 to Dchj.n and resistance R chj replace, described single channel current drive circuit 2.j, j=1, n-1, by NPN type triode Qj, NPN type triode Qchj, n-j diode Dchj.j+1 to Dchj.n, resistance R j.1, resistance R j.2, resistance R chj forms, the anode of the anode of a resistance R end j.1 and the output voltage vdc of rectification circuit (1) and the LED of high-voltage LED lamp pearl string G1 is connected, the resistance R other end j.1 and the base stage of NPN type triode Qj, the collector electrode of NPN type triode Qchj is connected, the anode of the LED string Gj+1 of the negative electrode of the collector electrode of NPN type triode Qj and the LED of high-voltage LED lamp pearl string Gj and high-voltage LED lamp pearl is connected, the emitter of NPN type triode Qj and resistance R j.2 an end and the anode of voltage vrj be connected, the resistance R other end j.2 and the negative terminal of voltage vrj, the emitter of NPN type triode Qchj and node Gnd are connected, the base stage of NPN type triode Qchj is connected with the end of resistance R chj, the other end of resistance R chj is connected with the negative electrode of diode Dchj.j+1 to Dchj.n, the anode of diode Dchj.j+1 to Dchj.n is connected with the anode of the voltage vrj+1 of the single channel current drive circuit 2.j+1 anode to the voltage vrn of single channel current drive circuit (2.n) respectively.
3. driving power as described in one of claim 1 and 2, it is characterized in that: described single channel current drive circuit 2.k, k=1, n, also comprise overvoltage crowbar, described overvoltage crowbar is by resistance R vk.1, resistance R vk.2, resistance R vk.3, NPN type triode Qvk forms, the end of resistance R vk.1 is connected with the collector electrode of NPN type triode Qk, the other end of resistance R vk.1 is connected with the end of resistance R vk.2 and the end of resistance R vk.3, the other end of resistance R vk.2 is connected with the emitter of node Gnd and NPN type triode Qvk, the other end of resistance R vk.3 is connected with the base stage of NPN type triode Qvk, the collector electrode of NPN type triode Qvk is connected with the base stage of NPN type triode Qk.
4. driving power as described in one of claim 1 and 2, it is characterized in that: described single channel current drive circuit 2.k, k=1, n, also comprise current foldback circuit, described current foldback circuit is by resistance R ck.1, resistance R ck.2, resistance R ck.3, NPN type triode Qck forms, the end of resistance R ck.1 is connected with the emitter of NPN type triode Qk and the anode of voltage vrk, the other end of resistance R ck.1 is connected with the end of resistance R ck.2 and the end of resistance R ck.3, the other end of resistance R ck.2 is connected with the emitter of node Gnd and NPN type triode Qck, the other end of resistance R ck.3 is connected with the base stage of NPN type triode Qck, the collector electrode of NPN type triode Qck is connected with the base stage of NPN type triode Qk.
5. driving power as described in one of claim 1 and 2, it is characterized in that: described single channel current drive circuit 2.k, k=1, n, also comprise the PWM light adjusting circuit, described PWM light adjusting circuit is comprised of NPN type triode Qsk and resistance R sk, the collector electrode of NPN type triode Qsk is connected with the base stage of NPN type triode Qk, the base stage of NPN type triode Qsk is connected with the end of resistance R sk, the other end of resistance R sk is connected with the anode of pulse voltage source vpwm, and the emitter of NPN type triode Qsk is connected with the negative terminal of node Gnd and pulse voltage source vpwm.
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| CN2013200079936U CN203289688U (en) | 2013-01-07 | 2013-01-07 | High-voltage LED lamp bead driving power supply controlled by sectional type sinusoidal current |
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| CN103096590A (en) * | 2013-01-07 | 2013-05-08 | 浙江工业大学 | High voltage light-emitting diode (LED) lamp bead driving power supply controlled by sectional type sinusoidal current |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103096590A (en) * | 2013-01-07 | 2013-05-08 | 浙江工业大学 | High voltage light-emitting diode (LED) lamp bead driving power supply controlled by sectional type sinusoidal current |
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