CN201336757Y - Multi-way constant-current power supply used for high-power LED light source - Google Patents
Multi-way constant-current power supply used for high-power LED light source Download PDFInfo
- Publication number
- CN201336757Y CN201336757Y CNU2009200381192U CN200920038119U CN201336757Y CN 201336757 Y CN201336757 Y CN 201336757Y CN U2009200381192 U CNU2009200381192 U CN U2009200381192U CN 200920038119 U CN200920038119 U CN 200920038119U CN 201336757 Y CN201336757 Y CN 201336757Y
- Authority
- CN
- China
- Prior art keywords
- current
- circuit
- signal
- converter
- constant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a multi-way constant-current power supply used for a high-power LED light source. The power supply mainly consists of an input filter rectification circuit, a PFC convertor, a DC/DC constant-current convertor provided with a plurality of parallel inputs and used for regulating and outputting supply current provided by multiple LEDs in series, an open-loop controlled LLC convertor and a switching frequency synchronous circuit. The power supply has the advantages of good regulation rate, high efficiency, high power density, high power factor, expansible output adapting to a high-power LED light source and the like, solves the problem of mutual beat frequency of multiple convertors, can drive a variable number of LED light sources, has a wide practical value, and is especially suitable for the multiple high-power LED light sources in series.
Description
Technical field
The utility model relates to a kind of multiple constant current power supply that is used for high-power LED light source, particularly relate to a kind of LLC converter of open loop control that adopts and produce the method for intermediate bus bar direct voltage as the input of a plurality of inputs of back level DC/DC constant-current converter in parallel, relate to a kind of method that adopts the current source change-over circuit to gather the electric current of DC/DC constant-current converter, and relate to a kind of control methods that adopt the switching frequency synchronised of the LLC converter that switching frequency that the switching frequency synchronous circuit makes a plurality of inputs DC/DC converter in parallel and open loop control.
Background technology
Along with the LED technology rapid development, led light source has been widely used on the large power road lamps such as road lighting.And LED number is more on the present large power road lamp, and what have reaches up to a hundred, and the voltage of single channel series-fed is very high, poor reliability.
The power supply of at present common supply large power road lamp is divided into multichannel usually.Fig. 1 is the scheme of traditional multiple constant current power supply.Supply with pfc converter after single phase alternating current (A.C.) input process EMI filtering and the rectification, obtain a high voltage direct current output, this high pressure provides input for a plurality of inputs DC/DC constant-current converters in parallel.Because the back a plurality of DC/DC converters of level are high pressure inputs, switching loss is big, and efficient is not high.Be subjected to the restriction of switching loss, the switching frequency of this scheme converter is lower, thereby the volume of filtering device is bigger, is again multi-channel converter in addition, and the volume of whole power supply is bigger.And when after a plurality of input of level DC/DC converters in parallel move with different frequency, beat frequency phenomenon can appear.The way of converter is many more, and beat frequency phenomenon is serious more, needs extra the increase or additional filter, can cause the decreased performance of whole power supply and volume to increase.
Shortcoming in view of above-mentioned existing multiple constant current power supply, I am based on practical experience for many years and the professional knowledge of being engaged in power supply design, and cooperate theoretical utilization, am actively studied and innovate, in the hope of improving the shortcoming of existing multiple constant current out-put supply, make it have more practicality.After constantly studying and make repeatedly sample and improvement, develop the utility model that has practical value finally.
The utility model content
The purpose of this utility model is in order to overcome the defective of above-mentioned traditional multiple constant current power supply, a kind of have good regulation and high efficiency are provided, high power density and High Power Factor, can solve the mutual beat frequency problem of multi-channel converter, the led light source of variable number can be driven, the multiple constant current power supply of high-power LED light source of the output expanded of high-power LED light source can be adapted to.
The technical problems to be solved in the utility model realizes by the following technical solutions.After exchanging ac input voltage process EMI filtering and rectification, give pfc converter, can obtain High Power Factor by pfc converter.And the LLC converter of the high voltage direct current that pfc converter obtains supply open loop control obtains an intermediate bus bar direct voltage.Intermediate-bus voltage provides input for a plurality of input DC/DC constant-current converters in parallel etc., can solve the high problem of input voltage of DC/DC constant-current converter, thereby improve the efficient and the power density of whole power supply.And independently the DC/DC constant-current converter has good regulation.By adopting the control of switching frequency synchronous circuit, make the switching frequency synchronised of the switching frequency and the LLC converter that open loop is controlled of a plurality of inputs DC/DC converter in parallel, can solve the problem of the mutual beat frequency of multi-channel converter, make the multiple constant current power supply have extensibility.
The multiple constant current power supply that is used for high-power LED light source of the present utility model, what its structure comprised input filter rectifier, pfc converter, a plurality of input parallel connections is used to regulate the DC/DC constant-current converter that the LED that exports to multiple series series provides supply current, also comprises simultaneously:
The LLC converter of an open loop control is used to produce the input voltage of an intermediate bus bar direct voltage as the DC/DC constant-current converter, and exports the square wave voltage signal of two complementations;
A switching frequency synchronous circuit, square wave voltage signal with two complementations of described LLC converter output produces two narrow pulse signals control DC/DC constant-current converters that phase place is 180 degree, for the DC/DC constant-current converter provides and the corresponding to synchronous control signal of the switching frequency of LLC converter.
The LLC converter of above-mentioned open loop control further comprises:
Two electric capacity, the cascaded structure of first electric capacity and second electric capacity is used to receive DC input voitage;
Two switching tubes, first switching tube and second switch pipe are cascaded structure, are used to receive DC input voitage;
A Drive and Control Circuit is used to produce a pair of duty ratio near 50% complementary drive pulse;
A transformer, the leakage inductance of former limit winding and former limit winding, the secondary winding of two series connection have been comprised, former limit winding one end span of this transformer is connected on the central point of two series capacitances, the other end is connected across on the central point of two tandem tap pipes, the central point of two secondary windings is anodal connections of input voltage of intermediate bus bar direct voltage malleation output and a plurality of input DC/DC constant-current converter in parallel, and the two ends of two secondary windings are through rectifier diode ground connection and the square wave voltage signal of two complementations is provided for the switching frequency synchronous circuit.
Above-mentioned DC/DC constant-current converter further comprises:
A floating earth-current power-switching circuit is used to produce a voltage drop signal;
A float power is used to produce an accessory power supply and supplies with floating earth-current power-switching circuit work, is connected on to the reference of this float power the filter capacitor negative terminal of negative buck convertor output;
A described voltage drop signal of response is used for the negative buck convertor and the control chip thereof of transfer power, provides electric current to LED.
Above-mentioned floating earth-current power-switching circuit further comprises:
A circuit that is used to produce the reference current signal;
An error operational amplifier is used for current signal and described reference current signal that comparison detects, and described error operational amplifier produces a current error signal;
And respond the circuit that described current error signal is used to produce a voltage drop signal.
The circuit of above-mentioned reference current signal all is connected on the filter capacitor negative terminal of negative buck convertor output with reference to the reference ground of ground and error operational amplifier; The circuit of described generation voltage drop signal is a total radio amplifier.
Above-mentioned total radio amplifier comprises a positive-negative-positive triode and collector resistance, the collector electrode of this positive-negative-positive triode through collector resistance be connected on the spot, the base stage of this positive-negative-positive triode receives with reference to the error signal of ground for the error operational amplifier output on floating ground, and the voltage drop signal that collector resistance produces is connected with the end of oppisite phase Vfb of the error amplifier of the control chip of negative buck convertor end.
Above-mentioned switching frequency synchronous circuit further comprises:
The differential circuit of a symmetry, constitute by two symmetrical groups differential capacitance, resistance and discharge diode, being used to produce phase place is two narrow pulse signals of 180 degree, and the input signal of described differential capacitance is taken from the square wave voltage signal of two complementations at secondary winding two ends of transformer of the LLC converter of open loop control respectively;
A current potential lifting circuit, described current potential lifting circuit mainly is made of metal-oxide-semiconductor, current potential lifting resistance and frequency setting electric capacity, two narrow pulse signals that produced by the differential circuit of above-mentioned symmetry are controlled the metal-oxide-semiconductor grid of this current potential lifting circuit, the frequency setting pin RT/CT end of the control chip of the negative buck convertor in the signal output part of this current potential lifting circuit and the DC/DC constant-current converter is connected, and is used for turn-offing in advance the oscillator of control chip.
In sum, the multiple constant current out-put supply of researching and developing according to the utility model that is used for high-power LED light source, have good regulation and high efficiency, high power density and High Power Factor, solve the mutual beat frequency problem of multi-channel converter, can drive the led light source of variable number, the advantages such as the output expanded that can adapt to high-power LED light source, on method for designing and function, all have large improvement, have wide practical value, be suitable for very much on the large-power light-emitting diodes led light source of multiple series series.
Description of drawings
Fig. 1 is the LED power supply block diagram that a kind of existing traditional multichannel is exported;
The LED power supply block diagram that Fig. 2 exports for the multichannel of developing according to the utility model;
Fig. 3 is the block diagram of the DC/DC constant-current converter developed according to the utility model;
Fig. 4 is the circuit diagram of the LLC converter of the open loop control of developing according to the utility model;
Fig. 5 is the circuit diagram of the DC/DC constant-current converter developed according to the utility model;
Fig. 6 is according to switching frequency synchronous circuit figure of the present utility model.
Embodiment
For ease of the utility model is further understood, the utility model is explained in further detail below in conjunction with drawings and the specific embodiments.
Fig. 2 illustrates the multiple-output electric power block diagram of developing according to the utility model that is used for the large-power light-emitting diodes led light source.Its structure comprises in parallel being used to regulate the LED that exports to multiple series series LLC converter 106 and switching frequency synchronous circuit 110 of the DC/DC constant-current converter 108 of supply current, an open loop control is provided of input filter rectifier 100 and 102, pfc converter 104, a plurality of input.Wherein, convert direct current to after single phase alternating current (A.C.) input 100 process EMI filtering and the rectification 102, this direct current obtains high voltage direct current output through pfc converter 104.This high-voltage dc voltage obtains an intermediate bus bar direct voltage through the LLC converter 106 of an open loop control.This intermediate-bus voltage provides input for a plurality of inputs DC/DC constant-current converter 108 grades in parallel.The electric current of LED power supply is exported in these a plurality of inputs adjustings such as DC/DC constant-current converter 108 in parallel.Wherein switching frequency synchronous circuit 110 is the DC/DC converter of constant current output and the corresponding to synchronization control circuit of LLC converter switches frequency of open loop control.
Fig. 3 illustrates the DC/DC constant-current converter power supply block diagram of developing according to the utility model.The circuit topology of this DC/DC constant-current converter is negative voltage-dropping type (BUCK) converter 130, and the intermediate bus bar direct voltage of being exported by LLC converter 106 128 provides input.Because this converter 130 is negative buck convertors, its input and output are not altogether.Here we define input ground 136 on the spot, and output ground 138 is floating ground.The sign of the concrete reference earth signal in every square frame shown in Fig. 3.The LED output current obtains a current signal through over-current sensor 122, and this signal is corresponding to the reference ground on floating ground.Should obtain a voltage signal on reference ground on the spot through floating earth-current power-switching circuit 124 by floating earth-current signal.This voltage signal obtains an error signal with comparing at the reference current 126 at comparator 118 places, by the duty ratio of this error signal control DC/DC constant-current converter 130, controls the electric current of exporting to LED 116 with this.
Fig. 4 illustrates the circuit diagram of the LLC converter of the power supply prime that is used for led light source developed according to the utility model and open loop control, input voltage vin among the figure is that representative value is the alternating voltage of the wide region input of 110V/220V, and this voltage is through electromagnetic interface filter 140 and 144 work of AC/DC rectification circuit 142 supply power correcting converters (PFC).Obtain a stable high voltage direct current output voltage thus, representative value is 400V.Scheme of the present utility model is to adopt the resonance LLC converter of the open loop control of one-level intergrade, and the high pressure of PFC output is converted to suitable low pressure intermediate-bus voltage.This LLC converter can play the effect of isolation, can become suitable low pressure to high pressure drop again.For back level multichannel DC/DC constant-current converter provides suitable input voltage.The converter of back level just can adopt the BUCK circuit of non-isolation like this, because input voltage is a lower voltage, switching loss is not bigger so the switching frequency of BUCK circuit can push away higherly simultaneously.What the volume of the DC/DC constant-current converter of back level can be done like this is very little, has improved power density and expansion easily.And the power switch pipe of the LLC converter of prime is operated in no-voltage ZVS state, and switching loss is also extremely low, so also can push away switching frequency higherly and efficient higher.Thus, whole multiple power supplies can be realized higher power density and very high efficient.
The core of above-mentioned power supply prime scheme is the LLC converter of open loop control.So-called open loop control exactly adopt duty ratio to remove to drive the pipe of arm switch up and down of resonance oscillation semi-bridge near the complementary pulse of 50% fixed-frequency, keeps very little dead band, to prevent that the arm switch pipe is straight-through up and down between the complementary pulse.Such control mode need not optocoupler and feedback signal, does not need to regulate output voltage, and control mode is very simple.The operation principle of traditional LLC below underdraws.Traditional LLC converter is the switching frequency that changes converter by voltage-controlled oscillator (VCO), the voltage gain of input is regulated output voltage with this output that changes converter.It need detect output voltage, and the voltage feedback signal that is detected sends the voltage-controlled oscillator (VCO) of former avris to by optocoupler.This mode is the control system of a closed loop, needs feedback regulation.The LLC converter topology of this closed-loop control at present has been widely used.Because the intrinsic characteristic of LLC of closed-loop control, switching frequency is very high during its underloading, causes switching loss bigger.The control mode of the LLC converter of closed-loop control is comparatively complicated in addition.
What the utility model adopted is the LLC converter of open loop control, with reference to figure 4.Its structure comprises two capacitor C r, and the cascaded structure of the first capacitor C r/2 and the second capacitor C r/2 is used to receive DC input voitage; Two switching tube Q1 and Q2, the first switching tube Q1 and second switch pipe Q2 are cascaded structure, are used to receive DC input voitage; A Drive and Control Circuit 146 is used to produce a pair of duty ratio near 50% complementary drive pulse; A transformer 148, the leakage inductance that has comprised former limit winding P1 and former limit winding, the secondary winding S1 and the S2 of two series connection, the end span of the former limit winding P1 of this transformer is connected on the central point of two series capacitance Cr, the other end is connected across on the central point of two tandem tap pipe Q1 and Q2, the central point of two secondary winding S1 and S2 is anodal connections of input voltage of intermediate bus bar direct voltage malleation output and a plurality of input DC/DC constant-current converter in parallel, and the two ends of two secondary windings are through rectifier diode D1 and D2 ground connection and the square wave voltage signal SYNC1 and the SYNC2 of two complementations are provided for the switching frequency synchronous circuit.
Resonant capacitance Cr among Fig. 4, the leakage inductance Lr of the magnetizing inductance Lm of the former limit winding P1 of transformer 148 and 148 former limit windings constitutes the element of resonant cavity.Can release the resonance frequency Fr1 that converter is operated in series resonance point thus, as shown in Equation 1.
The LLC converter of the open loop control of adopting here, be to utilize the leakage inductance Lr of transformer 148 former limit windings to get final product as the series resonance inductance, need not add the series resonance inductance, set the resonance frequency Fr1 of the series resonance point of converter by the value of adjusting resonant capacitance Cr, so just save the components and parts cost, reduced volume.Duty ratio can be produced and a fixed frequency Fs can be set near 50% complementary pulse control chip 146, make fixed frequency Fs near resonance frequency Fr1, converter just is operated near the series resonance point like this, the input current of transformer 148 is near sinusoidal wave, and the current harmonics of whole like this power supply is just smaller.When satisfying formula 2, switching tube Q1, Q2 just can be operated under the no-voltage ZVS state.When satisfying formula 3, switching tube Q1, Q2 just can be operated under the condition of zero load under the no-voltage ZVS state.Therefore need only and adjust magnetizing inductance Lm, the switching tube Q1 of the LLC converter of open loop control, Q2 just can realize zero voltage switch at full-load range.Ip in the formula is a former limit peak current, and Im is a former limit exciting current, and Coss is switching tube Q1, the output junction capacitance of Q2.In addition, the rectifier diode D1 of secondary, D2 also are operated under the zero current ZCS state, almost do not have reverse recovery current, can use the diode of low voltage stress.Therefore the switching loss of converter is very low, and the efficient height is easily realized high frequencyization.
146 needs of Drive and Control Circuit can produce duty ratio and get final product near 50% complementary pulse, and need not to embed voltage-controlled oscillator (VCO).Like this, the control mode of the LLC converter of open loop control is just very simple.Because the value of the leakage inductance Lr of transformer 148 former limit windings is very little, promptly Lr＜＜Lm, the output of LLC converter is close to 1 to the voltage gain equivalence of input so.Because its input voltage is the output voltage of pfc converter, representative value is to be 400V, and the output of LLC converter is 1 to the voltage gain equivalence of input, so only need just can change the output voltage of LLC converter by changing the former secondary turn ratio of transformer 148.Though this output voltage is a precision is not very high intermediate-bus voltage, can satisfy the DC/DC constant-current converter work of back level fully.
Fig. 5 illustrates the DC/DC constant-current converter power circuit diagram of developing according to the utility model.Its structure comprises 152, one negative buck convertors of 156, one float powers of a floating earth-current power-switching circuit and control chip 150 and Q1.Described floating earth-current power-switching circuit comprises a circuit R2 and a U2 who is used to produce the reference current signal, an error operational amplifier U1, the circuit Q2 and the R6 of a voltage drop signal.The circuit of reference current signal wherein all is connected on the filter capacitor C1 negative terminal of negative buck convertor output with reference to the reference ground of ground and error operational amplifier; The circuit of described generation voltage drop signal is a total radio amplifier, its total radio amplifier comprises a positive-negative-positive triode Q2 and collector resistance R6, the collector electrode of this positive-negative-positive triode through collector resistance be connected on the spot, the base stage of this positive-negative-positive triode receives with reference to the error signal of ground for the error operational amplifier output on floating ground, and the voltage drop signal that collector resistance produces is connected with the end of oppisite phase Vfb of the error amplifier of the control chip of negative buck convertor end.
The main circuit topology of this converter is negative voltage-dropping type BUCK circuit.Controller 150 is common control chips, resembles UC2843 commonly used and gets final product, and the ground reference of the auxiliary power supply of this chip 150 is called for short on the spot, is connected with the source class of MOSFET pipe Q1, so can directly drive Q1, has simplified drive circuit.But brought trouble with regard to the current sampling of giving the back like this, reason is that the earth potential of control chip 150 is different with the earth potential of the current sampling circuit of back, and the latter is called for short floating ground, as shown in Figure 5.Traditional way is to adopt the difference channel direct sample, but difference channel needs very accurate resistors match, and sampling precision is not very high, and the output current precision is difficult to reach requirement of client.The core of the DC/DC constant-current converter of the utility model scheme is a current source change-over circuit 156.The earth potential of the auxiliary power supply VCCS of this circuit 156 is floating ground, therefore needs one with reference to the floating power supply 152 of ground for the power supply on floating ground, and this is a simple linear voltage-stabilizing circuit with reference to ground for the circuit on floating ground, is used widely.U1 in the floating earth-current power-switching circuit 156 is an error operational amplifier, it is that the reference current signal that floats the setting on ground is imported corresponding to reference ground that in-phase end is one, by resistance R 2, R10, R13 and the U2 that selects the TL431 type for use constitute, it is the current sampling signal on floating ground corresponding to reference ground that end of oppisite phase is one, is obtained by sample resistance R1 detection filter.By the comparison to sampling current, operational amplifier U1 obtains a current error signal.This error signal is controlled a total radio amplifier as input signal, and it is by resistance R 8, R14, R6 and PNP triode Q2 constitute, and it is input as corresponding to reference to the error signal of ground for the amplifier U1 output on floating ground, and it is output as corresponding to being on the spot resistance R 6 with reference to ground.Control the Q2 collector current by the current error signal that operational amplifier U1 obtains, on collector resistance R6 two ends, obtain a voltage drop, this voltage signal is passed to control chip 150, described control chip 150 provides gate leve to drive to MOSFET pipe Q1, make output current follow the tracks of the reference current signal of setting, regulate the output current of supplying with led light source 154 with this.Zener diode ZD1 plays output over-voltage protection here.
After design, during the DC/DC constant-current converter on the every road of level, set its switching frequency usually and equate.But owing to the reasons such as discreteness of parameter, the DC/DC converter switches frequency of back level is not quite similar, and can depart to some extent.When after the level multichannel the DC/DC converter move with different frequency, the beat frequency that frequency summation and difference on the frequency cause can cause the volume of electromagnetic interface filter to increase and be difficult to input and design, can cause the increase of output ripple to self, the way of converter is many more, and beat frequency phenomenon is serious more.This also is the design difficulty of multiple output converter.When the switching frequency of a plurality of converters is synchronized to a certain characteristic frequency, the converter after can be eliminated the design that beat frequency also can be simplified electromagnetic interface filter synchronously.
Fig. 6 illustrates switching frequency synchronous circuit figure of the present utility model, is connected between prime LLC converter and a plurality of inputs of the back level DC/DC constant-current converter in parallel.Described switching frequency synchronous circuit mainly comprises: the differential circuit of a symmetry and a current potential lifting circuit, described differential circuit is made of two symmetrical groups differential capacitance C8 and C5, resistance R 15 and R12, discharge diode D6 and D4, being used to produce phase place is two narrow pulse signals of 180 degree, and the input signal of described differential capacitance C8 and C5 is taken from the square wave voltage signal SYNC1 and the SYNC2 of two complementations at secondary winding two ends of transformer of the LLC converter of open loop control respectively; Described current potential lifting circuit mainly is made of metal-oxide-semiconductor Q4, current potential lifting resistance R 3 and frequency setting electric capacity, two narrow pulse signals that produced by the differential circuit of above-mentioned symmetry are controlled the metal-oxide-semiconductor grid of this current potential lifting circuit, the frequency setting pin RT/CT end of the control chip of the negative buck convertor in the signal output part of this current potential lifting circuit and the DC/DC constant-current converter is connected, and is used for turn-offing in advance the oscillator of control chip.
Two labels of SYNC1 and SYNC2 are square wave voltage signal of taking from the complementation of two output windings of transformer 148 among Fig. 4 among Fig. 6, and the square wave voltage signal of these two complementations is as the input signal of synchronous circuit 162.Synchronous circuit 162 is the circuit C8 of two symmetries, R15 and D6 and C5, and R12 and D4 constitute, and can produce phase place is two burst pulses of 180 degree.By adjusting differential capacitance C8, C5 and resistance R 12, the value of R15 and R7 just can be regulated the width and the amplitude of burst pulse.D4 and D6 are for to differential capacitance C8, the C5 repid discharge.Control chip 150 can be the integrated IC of band synchronizing function, can be the chip of common UC2843 series, also can be the control chip with frequency setting pin of oscillator.Fig. 6 shows that 150 are the UC2843 chip, and wherein RT/CT is the frequency setting pin of oscillator.R3 is several ohm a resistance, opens the current potential that Q4 raises this resistance by narrow pulse signal the oscillator of controller 150 is turn-offed in advance, thereby realize synchronous function.But the precondition that realizes synchronizing function is the original start frequency that the frequency of synchronizing signal is larger than control chip, is generally its 1.1～1.5 times.Because the LLC converter of prime is the resonance oscillation semi-bridge converter, suppose that its switching frequency is Fs, the frequency of the narrow pulse signal of synchronous circuit 162 gained is exactly 2Fs so, and the switching frequency of the DC/DC constant-current converter of back like this level is exactly 2 times of prime LLC converter switches frequency.By adjustment differential capacitance C8, C5 and resistance R 12, the value of R15 and R7 guarantees that the oscillator of controller 150 turn-offs in advance, so in theory by additional this synchronous circuit 162, whole power supply can be expanded a DC/DC constant-current converter arbitrarily.So just solved the beat frequency phenomenon of whole power supply duplex output, can well expand again the DC/DC constant-current converter of back level.
In this specification, Fig. 2,3,4,5,6 examples go out concrete application of the present utility model and embodiment, and are not to be intended to the scope of present disclosure or claim is limited on this content that presents.Though the utility model embodiment disclosed herein is considered to preferably at present, can carry out various changes and modification and without prejudice to spirit and scope of the present utility model.Therefore, according to equivalent variations or the certain applications that claim of the present utility model is done, still belong to the scope of claim that the utility model proposes.
Claims (7)
1, a kind of multiple constant current power supply that is used for high-power LED light source, what comprise input filter rectifier, pfc converter, a plurality of input parallel connections is used to regulate the DC/DC constant-current converter that the LED that exports to multiple series series provides supply current, it is characterized in that also comprising:
The LLC converter of an open loop control is used to produce the input voltage of an intermediate bus bar direct voltage as the DC/DC constant-current converter, and exports the square wave voltage signal of two complementations;
A switching frequency synchronous circuit, square wave voltage signal with two complementations of described LLC converter output produces two narrow pulse signals control DC/DC constant-current converters that phase place is 180 degree, for the DC/DC constant-current converter provides and the corresponding to synchronous control signal of the switching frequency of LLC converter.
2. the multiple constant current power supply that is used for high-power LED light source as claimed in claim 1 is characterized in that the LLC converter that described open loop is controlled, and further comprises:
Two electric capacity, the cascaded structure of first electric capacity and second electric capacity is used to receive DC input voitage;
Two switching tubes, first switching tube and second switch pipe are cascaded structure, are used to receive DC input voitage;
A Drive and Control Circuit is used to produce a pair of duty ratio near 50% complementary drive pulse;
A transformer, the leakage inductance of former limit winding and former limit winding, the secondary winding of two series connection have been comprised, former limit winding one end span of this transformer is connected on the central point of two series capacitances, the other end is connected across on the central point of two tandem tap pipes, the central point of two secondary windings is anodal connections of input voltage of intermediate bus bar direct voltage malleation output and a plurality of input DC/DC constant-current converter in parallel, and the two ends of two secondary windings are through rectifier diode ground connection and the square wave voltage signal of two complementations is provided for the switching frequency synchronous circuit.
3. the multiple constant current power supply that is used for high-power LED light source as claimed in claim 2 is characterized in that described DC/DC constant-current converter, further comprises:
A floating earth-current power-switching circuit is used to produce a voltage drop signal;
A float power is used to produce an accessory power supply and supplies with floating earth-current power-switching circuit work, is connected on to the reference of this float power the filter capacitor negative terminal of negative buck convertor output;
A described voltage drop signal of response is used for the negative buck convertor and the control chip thereof of transfer power, provides electric current to LED.
4. the multiple constant current power supply that is used for high-power LED light source as claimed in claim 3 is characterized in that described floating earth-current power-switching circuit, further comprises:
A circuit that is used to produce the reference current signal;
An error operational amplifier is used for current signal and described reference current signal that comparison detects, and described error operational amplifier produces a current error signal;
And respond the circuit that described current error signal is used to produce a voltage drop signal.
5. the multiple constant current power supply that is used for high-power LED light source as claimed in claim 4 is characterized in that the circuit of described reference current signal all is connected on the filter capacitor negative terminal of negative buck convertor output with reference to the reference ground of ground and error operational amplifier;
The circuit of described generation voltage drop signal is a total radio amplifier.
6. the multiple constant current power supply that is used for high-power LED light source as claimed in claim 5, it is characterized in that described total radio amplifier comprises a positive-negative-positive triode and collector resistance, the collector electrode of this positive-negative-positive triode through collector resistance be connected on the spot, the base stage of this positive-negative-positive triode receives with reference to the error signal of ground for the error operational amplifier output on floating ground, and the voltage drop signal that collector resistance produces is connected with the end of oppisite phase Vfb of the error amplifier of the control chip of negative buck convertor end.
7, as the described multiple constant current power supply that is used for high-power LED light source one of in the claim 1～6, it is characterized in that described switching frequency synchronous circuit, further comprise:
The differential circuit of a symmetry, constitute by two symmetrical groups differential capacitance, resistance and discharge diode, being used to produce phase place is two narrow pulse signals of 180 degree, and the input signal of described differential capacitance is taken from the square wave voltage signal of two complementations at secondary winding two ends of transformer of the LLC converter of open loop control respectively;
A current potential lifting circuit, described current potential lifting circuit mainly is made of metal-oxide-semiconductor, current potential lifting resistance and frequency setting electric capacity, two narrow pulse signals that produced by the differential circuit of above-mentioned symmetry are controlled the metal-oxide-semiconductor grid of this current potential lifting circuit, the frequency setting pin RT/CT end of the control chip of the negative buck convertor in the signal output part of this current potential lifting circuit and the DC/DC constant-current converter is connected, and is used for turn-offing in advance the oscillator of control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200381192U CN201336757Y (en) | 2009-01-22 | 2009-01-22 | Multi-way constant-current power supply used for high-power LED light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200381192U CN201336757Y (en) | 2009-01-22 | 2009-01-22 | Multi-way constant-current power supply used for high-power LED light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201336757Y true CN201336757Y (en) | 2009-10-28 |
Family
ID=41288421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200381192U Expired - Fee Related CN201336757Y (en) | 2009-01-22 | 2009-01-22 | Multi-way constant-current power supply used for high-power LED light source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201336757Y (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976950A (en) * | 2010-11-08 | 2011-02-16 | 扬州中凌自动化技术有限公司 | Control circuit of BUCK circuit |
| CN102149239A (en) * | 2010-12-06 | 2011-08-10 | 南京航空航天大学 | LED (light-emitting diode) string current-equalizing circuit and control method |
| CN102333406A (en) * | 2011-10-31 | 2012-01-25 | 中国科学院自动化研究所 | Light-emitting diode (LED) driver for illumination |
| CN102340251A (en) * | 2010-07-20 | 2012-02-01 | 台达电子工业股份有限公司 | Alternating-current to direct-current converter and control circuit thereof |
| CN102348307A (en) * | 2010-07-30 | 2012-02-08 | 深圳市桑达实业股份有限公司 | LED street lamp and driving power supply circuit thereof |
| CN102510614A (en) * | 2011-10-25 | 2012-06-20 | 上海大学 | LED (light-emitting diode) multi-lamp distributed group drive system |
| CN103116378A (en) * | 2013-01-11 | 2013-05-22 | 北京经纬恒润科技有限公司 | Analog circuit with variable resistance |
| CN103152896A (en) * | 2011-12-06 | 2013-06-12 | 重庆瑞升康博电气有限公司 | High-power lighting emitting diode (LED) intelligent power source actuator with innovative framework |
| TWI463771B (en) * | 2010-08-27 | 2014-12-01 | Univ Nat Cheng Kung | Llc resonant converting system with continuous-current-mode power-factor-correction |
| CN105138061A (en) * | 2015-09-23 | 2015-12-09 | 湖南工业大学 | Direct-current auxiliary power supply for constant current circuit voltage division |
| WO2017088223A1 (en) * | 2015-11-23 | 2017-06-01 | 上海泓语电气技术有限公司 | Led lighting driver power supply system for high-voltage alternating current system |
| CN108111032A (en) * | 2016-11-25 | 2018-06-01 | 台达电子工业股份有限公司 | Power conversion unit and power converting method |
| CN109362153A (en) * | 2018-11-09 | 2019-02-19 | 南京博德新能源技术有限公司 | A kind of LED drive power with light modulation turn-off function |
| CN109586567A (en) * | 2018-11-08 | 2019-04-05 | 深圳航天科技创新研究院 | A kind of topological structure of wide input voltage range multichannel High voltage output |
| CN109781388A (en) * | 2019-02-25 | 2019-05-21 | 电子科技大学中山学院 | Single-tube high-power laser screening test system based on distributed constant-current driving power supply |
| CN110277917A (en) * | 2018-03-13 | 2019-09-24 | 比亚迪股份有限公司 | The urban transportation and its bidirectional DC-DC converter and control method |
| CN113972811A (en) * | 2020-07-23 | 2022-01-25 | 中国电子科技集团公司第二十四研究所 | Infrared bias power module based on integrated plastic package |
| CN114336271A (en) * | 2021-11-29 | 2022-04-12 | 巴可伟视(北京)电子有限公司 | Preparation method of laser array driving module |
-
2009
- 2009-01-22 CN CNU2009200381192U patent/CN201336757Y/en not_active Expired - Fee Related
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340251A (en) * | 2010-07-20 | 2012-02-01 | 台达电子工业股份有限公司 | Alternating-current to direct-current converter and control circuit thereof |
| CN102340251B (en) * | 2010-07-20 | 2014-06-04 | 台达电子工业股份有限公司 | Alternating-current to direct-current converter and control circuit thereof |
| CN102348307A (en) * | 2010-07-30 | 2012-02-08 | 深圳市桑达实业股份有限公司 | LED street lamp and driving power supply circuit thereof |
| CN102348307B (en) * | 2010-07-30 | 2014-04-09 | 深圳市桑达实业股份有限公司 | LED street lamp and driving power supply circuit thereof |
| TWI463771B (en) * | 2010-08-27 | 2014-12-01 | Univ Nat Cheng Kung | Llc resonant converting system with continuous-current-mode power-factor-correction |
| CN101976950A (en) * | 2010-11-08 | 2011-02-16 | 扬州中凌自动化技术有限公司 | Control circuit of BUCK circuit |
| CN102149239B (en) * | 2010-12-06 | 2015-06-10 | 南京航空航天大学 | LED (light-emitting diode) string current-equalizing circuit and control method |
| CN102149239A (en) * | 2010-12-06 | 2011-08-10 | 南京航空航天大学 | LED (light-emitting diode) string current-equalizing circuit and control method |
| CN102510614A (en) * | 2011-10-25 | 2012-06-20 | 上海大学 | LED (light-emitting diode) multi-lamp distributed group drive system |
| CN102333406A (en) * | 2011-10-31 | 2012-01-25 | 中国科学院自动化研究所 | Light-emitting diode (LED) driver for illumination |
| CN103152896A (en) * | 2011-12-06 | 2013-06-12 | 重庆瑞升康博电气有限公司 | High-power lighting emitting diode (LED) intelligent power source actuator with innovative framework |
| CN103116378A (en) * | 2013-01-11 | 2013-05-22 | 北京经纬恒润科技有限公司 | Analog circuit with variable resistance |
| CN103116378B (en) * | 2013-01-11 | 2014-12-10 | 北京经纬恒润科技有限公司 | Analog circuit with variable resistance |
| CN105138061A (en) * | 2015-09-23 | 2015-12-09 | 湖南工业大学 | Direct-current auxiliary power supply for constant current circuit voltage division |
| WO2017088223A1 (en) * | 2015-11-23 | 2017-06-01 | 上海泓语电气技术有限公司 | Led lighting driver power supply system for high-voltage alternating current system |
| CN108111032A (en) * | 2016-11-25 | 2018-06-01 | 台达电子工业股份有限公司 | Power conversion unit and power converting method |
| CN110277917A (en) * | 2018-03-13 | 2019-09-24 | 比亚迪股份有限公司 | The urban transportation and its bidirectional DC-DC converter and control method |
| CN110277917B (en) * | 2018-03-13 | 2021-06-18 | 比亚迪股份有限公司 | Rail transit power supply system, bidirectional DC-DC converter thereof and control method |
| CN109586567A (en) * | 2018-11-08 | 2019-04-05 | 深圳航天科技创新研究院 | A kind of topological structure of wide input voltage range multichannel High voltage output |
| CN109362153A (en) * | 2018-11-09 | 2019-02-19 | 南京博德新能源技术有限公司 | A kind of LED drive power with light modulation turn-off function |
| CN109781388A (en) * | 2019-02-25 | 2019-05-21 | 电子科技大学中山学院 | Single-tube high-power laser screening test system based on distributed constant-current driving power supply |
| CN113972811A (en) * | 2020-07-23 | 2022-01-25 | 中国电子科技集团公司第二十四研究所 | Infrared bias power module based on integrated plastic package |
| CN113972811B (en) * | 2020-07-23 | 2023-09-22 | 中国电子科技集团公司第二十四研究所 | Infrared bias power supply module based on integrated plastic package |
| CN114336271A (en) * | 2021-11-29 | 2022-04-12 | 巴可伟视(北京)电子有限公司 | Preparation method of laser array driving module |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201336757Y (en) | Multi-way constant-current power supply used for high-power LED light source | |
| WO2021103415A1 (en) | High-gain quasi-resonance dc-dc converter based on voltage doubling rectifier circuit | |
| CN105305829B (en) | The unidirectional DC DC converters of current mode and symmetric double PWM add phase-shifting control method | |
| CN110190751B (en) | Constant-gain bidirectional DC-DC resonant converter and control method thereof | |
| CN110391760B (en) | High power factor hybrid structure multi-output switch converter | |
| CN111010043B (en) | Full-bridge LLC resonant converter fixed-frequency control method | |
| CN109687720B (en) | Wide-input-voltage-range resonant type conversion device and control method thereof | |
| CN101312330A (en) | High voltage power source of resonant transformer | |
| CN108964474A (en) | A kind of three mode rectification topologies based on LLC resonant converter | |
| CN101534056B (en) | Output adjustable structure-changeable direct current switch power supply | |
| CN113659820B (en) | Soft start control method of LLC resonant converter | |
| CN109586567A (en) | A kind of topological structure of wide input voltage range multichannel High voltage output | |
| CN114583967A (en) | Isolated direct-current boost converter of two-phase parallel boost circuit and control method thereof | |
| CN103441680A (en) | Soft-switching full-bridge direct-current converter capable of reducing current-circulation loss | |
| CN102857103A (en) | Three-level LLC (Logical Link Control) direct-current converter and control method thereof | |
| CN201199674Y (en) | High-voltage power supply apparatus for resonant converter | |
| CN110445387B (en) | Topological structure and control method of formation and grading power supply | |
| CN109698627B (en) | Full-bridge DC/DC converter based on switched capacitor and modulation strategy thereof | |
| CN115811241B (en) | Mixed control method for single-stage bridgeless staggered parallel Boost-LLC AC-DC converter | |
| CN1538606A (en) | Low voltage largecurrent modle power source | |
| CN110729906A (en) | Zero-voltage conversion CLL resonant DC-DC converter and control method thereof | |
| CN207460002U (en) | A kind of cascade two-stage type DC converter of wide input range | |
| Jiao et al. | LLC Resonant Converter Based Single-stage Inverter with Multi-resonant Branches using Variable Frequency Modulation | |
| CN210724569U (en) | Zero-voltage conversion CLL resonance DC-DC converter | |
| CN114050725A (en) | Control method applied to reverse light-load operation of CLLC bidirectional DC/DC converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091028 Termination date: 20110122 |