CN105050248A - Capacitive linear output LED driving power supply - Google Patents
Capacitive linear output LED driving power supply Download PDFInfo
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- CN105050248A CN105050248A CN201510371681.7A CN201510371681A CN105050248A CN 105050248 A CN105050248 A CN 105050248A CN 201510371681 A CN201510371681 A CN 201510371681A CN 105050248 A CN105050248 A CN 105050248A
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Abstract
The invention discloses a capacitive linear output LED driving power supply. Voltage conversion is carried out directly based on the principle of high-frequency capacitor charging and discharging. Two MOSFETs respectively control capacitor charging and discharging at working frequency of 20KHZ to 200KHZ to realize voltage conversion. Based on the fact that the input voltage and output power have a linear relationship when the capacity of a capacitor is fixed and the capacitor has constant power characteristic within a certain scope of output power, damage to LED lamps due to voltage change is avoided, and the service life of LED lamps is prolonged. The LED driving power supply disclosed by the invention has the advantages of simple structure, low cost, and small size. The LED driving power supply meets the driving requirement for constant power output within the large range of change of the number of LED lamp beads from 100% to 200%. The effect is more obvious at low power. The efficiency is 84-94% at 3-50 watts. The power factor is 0.9-0.98. When the power is 50 watts to hundreds of watts, the conversion efficiency can reach 95-97%, and the power factor is up to 0.92 to 0.98.
Description
Technical field
The invention belongs to the current transformer of electrical technology field, be that a kind of capacitor charging/discharging that utilizes produces the LED drive power of linear power output concretely, be related specifically to and utilize the discharge and recharge of power electronic technology control capacitor to make DC output power present the LED drive power of the High Power Factor of linear relationship along with AC-input voltage change.
Background technology
Compare LED illumination lamp with traditional incandescent lamp, fluorescent lamp and commercially available electricity-saving lamp, in many-sides such as luminous efficiency, energy-conserving and environment-protective and useful lifes, there is obvious advantage, be therefore described as 21st century the most promising green light source.In order to enable LED illumination lamp normally work, alternating current must be converted to the direct current required by LED illumination lamp by LED drive power.Because the driving voltage of LED illumination lamp and the relation of electric current are nonlinear, electric current presents exponential increase with the rising of driving voltage, causes the temperature in LED to raise, very easily causes LED to be damaged, on the other hand, the variations in temperature of LED illumination lamp also can affect the operating power of LED illumination lamp; Based on the consideration of efficiency and volume angle, existing LED illumination lamp many employings constant voltage or constant-current switch power source, switching frequency is generally in 20-100 kilocycle.For adapting to mains voltage variations, Switching Power Supply is all adopt current closed-loop or voltage close loop to carry out closed loop PWM pulse width control, in practical work process, closed loop response can cause LED illumination lamp immediate current or overtension slowly once in a while, cause the irreversible light decay of LED, time serious, then can damage LED illumination lamp.In order to carry out constant voltage or current constant control, the pulsewidth of Switching Power Supply modulation all leaves very large width, namely in burst pulse work, impacts large, cause electrolytic capacitor filter device to shorten useful life to the output filter capacitor of power supply.And Switching Power Supply is carried out the work of transformation and step-down driving LED lamp pearl group mostly by transformer and energy storage inductor, efficiency is low; Especially, when small-power exports, efficiency only has 70%-87%, and power factor is 0.5-0.85.The driving power of another kind of LED illumination lamp is linear stabilized power supply, and adopt an IC or multiple IC to distribute voltage, electronic devices and components kind is few, does not need electrochemical capacitor.IC driving power has high reliability, High Power Factor, high efficiency, low-cost advantage; But this power supply is only suitable for the high dozens of lamp pearl occasion of voltage to be used, and exports high pressure, has stroboscopic.The driving power of the third LED illumination lamp is capacitance-resistance pressure drop power supply, though have, structure is simple, low cost and other advantages, poor stability, power and power factor (about 0.2) low.The linear LED drive power of dividing potential drop rectification falls in patent application (201420291297.7) non-polar condenser, although solve the problem that input voltage and power output linearly export, power factor is only 0.5-0.6.Therefore, find that a kind of power factor is high, input voltage and the power output linear and LED illumination lamp driving power of energy-conserving and environment-protective in the certain scope of application problem that to be current power electronic technology fields urgently to be resolved hurrily.
Summary of the invention
For the deficiencies in the prior art, the technical problem to be solved in the present invention is, provides a kind of condenser type linear convergent rate LED drive power.After being charged at least one charging capacitor by the control of a charging valve (MOSFET) in the direct current 100HZ pulsating voltage waveform of this power supply after rectification, the electric charge stored by a discharge tube Co ntrolled release charging capacitor discharges to electric discharge output capacitor and load.Charging and discharging frequency, at 20KHZ-200KHZ, achieves voltage transitions under transformerless condition, improves the AC power factor of power supply and alternating current to galvanic conversion efficiency.
Operation principle of the present invention and physical process are: after AC rectification, control at least one charging capacitor charge by a charging valve through a current-limiting resistance (or inductance); A discharge tube controls at least one charge and discharge capacitance device through same current-limiting resistance (or inductance) and carries out parallel electric discharge to electric discharge output capacitor, and electric discharge output capacitor both end voltage is LED driving voltage; A charging valve and discharge tube alternate conduction in complementary fashion, centre is provided with dead band, and achieve the linear convergent rate of AC-input voltage to LED load and DC output power, its operating frequency is 20KHZ-200KHZ.Operation principle of the present invention and physical process are: after AC rectification, control at least one charging capacitor charge by a charging valve through a current-limiting resistance (or inductance); Another discharge tube controls at least one charge and discharge capacitance device through same current-limiting resistance (or inductance) and carries out parallel electric discharge to electric discharge output capacitor, and electric discharge output capacitor both end voltage is LED driving voltage; A charging valve and discharge tube alternate conduction in complementary fashion, centre is provided with dead band, and achieve the linear convergent rate of AC-input voltage to LED load and DC output power, its operating frequency is 20KHZ-200KHZ.By capacitor institute work Q=U × I=2U
2π fC is known, when discharge and recharge frequency f is definite value, and square being directly proportional of Q and voltage.When the voltage increases, the energy of discharge and recharge increases.From the conservation of energy, the energy of supply LED does not suddenly change, thus Limited Current sudden change, decrease LED illumination lamp causes current break to be damaged probability because of the change of input ac voltage, the requirement that LED illumination lamp drives can be adapted to, improve the useful life of LED illumination lamp.This power supply can be used as the LED drive power of the constant power output that LED lamp bead quantity changes within the scope of 100%-200%, meets the requirement of all size light fixture.Export to adapt to various voltage, the present invention can adopt many charge and discharge capacitances and many charging diodes and discharge diode to combine to carry out Multilevel partial-pressure, make Multilevel partial-pressure formula electric capacity linear convergent rate LED drive power.。The pass of VD E, electric current I and current-limiting resistance R is:
in formula, U is input ac voltage, and R is current-limiting resistance, and I is the current average by current-limiting resistance, and N is dividing potential drop progression.As can be seen from formula, reasonably choose N, the loss of current-limiting resistance can be reduced.When electric current is larger, inductance should be adopted to utilize induction reactance to carry out current limliting, be beneficial to improve power supply conversion efficiency.
The technical solution adopted for the present invention to solve the technical problems is, a kind of condenser type linear convergent rate LED drive power is made up of input L and N, rectification circuit, control circuit, charge-discharge circuit, output circuit.Described rectification circuit is made up of bridge rectifier D Q and filter capacitor Cb; Described control circuit is made up of MOSFET pipe semibridge system drived control chip K (its inside is provided with high-end suspension driver) and starting resistance RJ carrying oscillator; Described charge-discharge circuit is made up of charging valve BG1, discharge tube BG2, current-limiting resistance R, charging capacitor C2 and electric discharge output capacitor C1; Described output circuit by output+, output-and load in series lamp group LEDZ form.
In such scheme, described control circuit, by MOSFET pipe semibridge system drived control chip K (inside is provided with high-end suspension driver) carrying oscillator, is that the high-end suspended grid driver functions of bootstrap type is powered by bootstrap capacitor and diode.Control chip also can adopt the MOSFET pipe push-pull drive control chip carrying oscillator, one router chip drive, an other route boot high-end suspended grid driving chip drive.
In such scheme, charging valve BG1 and discharge tube BG2 in described charge-discharge circuit, can select the one in IGBT, MOSFET and power crystal triode.
When described condenser type linear convergent rate LED drive power driving LED illuminating lamp electric current is larger, in order to reduce the wastage, current-limiting resistance R application inductance substitutes.
A kind of each circuit connecting relation of condenser type linear convergent rate LED drive power is as follows: input L with N is connected respectively to two of bridge rectifier D Q in rectification circuit and exchanges end, one end of the output cathode of bridge rectifier D Q+connect filtering capacitor Cb, the other end of the negative pole of bridge rectifier D Q-connect filtering capacitor Cb, the positive pole of the bridge rectifier D Q in rectification circuit connects with the one end of the starting resistance RJ in control circuit, the other end of starting resistance RJ is held with the startup a of control chip K and is connected, the output negative pole of bridge rectifier D Q-be connected with the negative electrode of the c end in control chip K in control circuit and the charging valve BG1 in charge-discharge circuit, the grid of the charging valve BG1 in described charge-discharge circuit is held with the b of the control chip K in control circuit and is connected, the anode of charging valve BG1 and the one end of the charging capacitor C2 in charge-discharge circuit are held with the e of the control chip in the negative electrode of discharge tube BG2 and control circuit and are connected, the other end of charging capacitor C2 is connected with one end of current-limiting resistance R, the other end of current-limiting resistance R is connected with the bridge rectifier D Q positive pole of rectification circuit with the one end of electric discharge output capacitor C1 in charge-discharge circuit, the other end of electric discharge output capacitor C1 and the anode of discharge tube BG2, the negative pole of the output-in output circuit and load LEDZ is connected, the grid of discharge tube BG2 is held with the d of control chip K and is connected, output in output circuit+be connected with the positive pole of load LEDZ one end with the electric discharge output capacitor C1 in charge-discharge circuit.
Beneficial effect of the present invention is, owing to adopting capacitor step-down, carries out the discharge and recharge of 20KHZ-200KZ high order, improve utilance and the power factor of power supply in the positive and negative half period of alternating current; Utilize capacitor stored energy for definite value, make input ac voltage and DC output power be linear relationship; Extend the useful life of LED illumination lamp, reduce power volume.Especially eliminate transformer and transducing inductance, utilize resistance or current limit by inductance, reduce the wastage further.The efficiency of the LED illumination lamp of little wattage can reach more than 84%; The efficiency of 12 watt-hour LED illumination lamp can reach more than 92%, and during large wattage, efficiency can reach 93-96% power factor and can reach 0.9-0.99, overcomes Switching Power Supply conversion efficiency and the low shortcoming of power factor when little wattage.
Accompanying drawing explanation
Fig. 1 condenser type LED linear exports driving power
Number in the figure:
1 rectification circuit
2 control circuits
3 charge-discharge circuits
4 output circuits
Fig. 2 condenser type one dividing potential drop linear convergent rate LED drive power
Number in the figure:
1 rectification circuit
2 control circuits
3 charge-discharge circuits
4 output circuits
Fig. 3 condenser type two dividing potential drop linear convergent rate LED drive power
Number in the figure:
1 rectification circuit
2 control circuits
3 charge-discharge circuits
4 output circuits
Embodiment
Below in conjunction with embodiment and accompanying drawing thereof, the present invention is described in further details.
The present invention is a kind of condenser type linear convergent rate LED drive power, and Fig. 1 is a kind of condenser type linear convergent rate LED drive power schematic diagram.This power supply is made up of input L and N, rectification circuit 1, control circuit 2, charge-discharge circuit 3, output circuit 4.Described rectification circuit 1 is made up of bridge rectifier D Q and filter capacitor Cb; Control circuit 2 is made up of the MOSFET pipe semibridge system drived control chip K and starting resistance RJ carrying oscillator; Described charge-discharge circuit 3 is made up of charging valve BG1, discharge tube BG2, current-limiting resistance R, charging capacitor C2 and electric discharge output capacitor C1; Described output circuit 4 by output+, output-and load LEDZ series lamp group form.
During work, input L and N access mains electricity, alternating current after bridge rectifier D Q rectification and filter capacitor Cb filtering, for control circuit 2 and charge-discharge circuit 3 provide DC pulse moving voltage.Control chip K in control circuit 2 controls charging valve BG1 conducting through starting resistance RJ, and electric current is through electric discharge output capacitor C1, current-limiting resistance R, carry out charging control to charging capacitor C2; Charging valve BG1 turns off, and after Dead Time, by control chip K controlled discharge pipe BG2 conducting, the electric charge that release is stored in charging capacitor C2 is that electric discharge output capacitor C1 and load LEDZ series lamp group are powered through current-limiting resistance R.
Usefulness of the present invention is, owing to carrying out the discharge and recharge of capacitor high frequency in the DC pulse waveform after rectification, improves the power factor of power supply, can be 22-34 LED strip connection lamp pearl to power, efficiency can reach 84%-94%, and power factor reaches 0.9-0.99, and volume is little.
Fig. 2 is condenser type one dividing potential drop linear convergent rate LED drive power schematic diagram, and this power supply is made up of input L and N, rectification circuit 1, control circuit 2, charge-discharge circuit 3, output circuit 4.Described rectification circuit 1 is made up of bridge rectifier D Q and filter capacitor Cb; Described control circuit 2 is made up of the MOSFET pipe semibridge system drived control chip K and starting resistance RJ carrying oscillator; Described charge-discharge circuit 3 is made up of charging valve BG1, discharge tube BG2, current-limiting resistance R, charging capacitor C2 and electric discharge output capacitor C1, charging diode D2 and discharge diode D1; Described output circuit 4 by output+, output-and load LEDZ series lamp group form.
In such scheme, described control circuit 2 provides supply power voltage to be that the high-end suspended grid driver functions of bootstrap type is powered by the MOSFET pipe semibridge system drived control chip (inside is provided with high-end suspension driver) carrying oscillator by bootstrap capacitor and diode.Or control chip is recommended in employing, a router chip controls, the high-end suspended grid driver control of another route bootstrap type.
The each circuit connecting relation of this power supply is as follows, input L with N is connected respectively to two of bridge rectifier D Q in rectification circuit 1 and exchanges end, the output cathode of bridge rectifier D Q+be connected with one end of filtering capacitor Cb, the negative pole of bridge rectifier D Q-be connected with the other end of filtering capacitor Cb; The output cathode of the bridge rectifier D Q in described rectification circuit 1+be connected with the positive pole of the output+in one end of the one end of the starting resistance RJ in control circuit 2 and the negative pole of the discharge diode D1 in charge-discharge circuit 3, the output capacitor C1 that discharges, output circuit 4 and load LEDZ, the electric discharge output capacitor C1 other end in charge-discharge circuit 3 is connected with the negative pole of one end of current-limiting resistance R with the output-in output circuit and LED group; The other end of current-limiting resistance R (inductance) is connected with the positive pole of charging diode D2 with the anode of discharge tube BG2; The output negative pole of the bridge rectifier D Q in rectification circuit 1-with the c of the control chip K in described control circuit 2 is held and the negative electrode of charging valve BG1 in described charge-discharge circuit 3 is connected; The other end of the starting resistance RJ in described control circuit 2 is held with a of control chip K and is connected, b end on control chip K is connected with the grid of the charging valve BG1 of charge-discharge circuit 3, the d end of control chip K is connected with the grid of the discharge tube BG2 in charge-discharge circuit, and the e end on control chip K is connected with the negative electrode of the discharge tube BG2 in charge-discharge circuit 3; The positive pole of the discharge diode D1 in charge-discharge circuit 3 is connected with one end of charging capacitor C2 with the negative pole of charging diode D2, and the other end of charging capacitor C2 is connected with the negative electrode of discharge tube BG2 with the anode of charging valve BG1.
Operation principle of the present invention is, after AC rectification, an electric discharge output capacitor and LED lamp bead group in parallel, control electric current by a charging valve and carry out tandem charging via a current-limiting resistance (or inductance), charging diode to electric discharge output capacitor and a charging capacitor; Have no progeny when a charging valve closes, after Dead Time, an electric discharge output capacitor and a charging capacitor are controlled to carry out parallel electric discharge through same current-limiting resistance (or inductance), a discharge diode by a discharge tube; Electric discharge output capacitor both end voltage is the driving voltage of LED lamp bead group, and a charging valve and discharge tube are alternate conduction in complementary fashion, and centre is provided with dead band, and its operating frequency is 20KHZ-200KHZ.
During work, input L and N accesses mains electricity, alternating current is after bridge rectifier D Q rectification, by filtering capacitor Cb filtering, for control circuit 2 and charge-discharge circuit 3 provide DC pulse moving voltage, the a end of the control chip K in control circuit 2 is powered by starting resistance RJ, controls charging valve BG1 conducting, electric current through current-limiting resistance R, charging diode D2, tandem charging carried out to electric discharge output capacitor C1 and charging capacitor C2 control; Charging valve BG1 turns off, and after Dead Time, by control chip K controlled discharge pipe BG2 conducting, the electric charge that release is stored in charging capacitor C2 is that electric discharge output capacitor C1 and load LEDZ lamp group are powered through discharge diode D1 and current-limiting resistance R.The complementary break-make of control chip K control BG1 and BG2, centre is provided with dead band, with the operating frequency controlled discharge output capacitor C1 of 20KHZ-200KHZ and the work of charging capacitor C2 cycle charge-discharge, produce output dc voltage at electric discharge output capacitor C1 two ends, to load LEDZ lamp group provide with AC-input voltage change and present the direct voltage of linear power output.
The beneficial effect foot of this power supply, owing to adopting partial pressure type charge/discharge operation, further increases input ac voltage and output dc voltage ratio, thus reduces output voltage, decrease the quantity of LED lamp bead, improve the reliability of light fixture; Because electric discharge output capacitor C1 has electric current to pass through when discharge and recharge, reduce the use capacity of ripple current and electric discharge output capacitor C1.The quantity that this driving power circuit is applicable to lamp pearl changes between 10-22, and power factor is 0.92-0.96, and efficiency can reach 84%-95%.
Fig. 3 is condenser type two dividing potential drop linear convergent rate LED drive power schematic diagram.This power supply is made up of input L and N, rectification circuit 1, control circuit 2, charge-discharge circuit 3, output circuit 4.Described rectification circuit 1 is made up of bridge rectifier D Q and filter capacitor Cb; Described control circuit 2 is made up of the MOSFET pipe semibridge system drived control chip K and starting resistance RJ carrying oscillator; Described charge-discharge circuit 3 is made up of charging valve BG1, discharge tube BG2, current-limiting resistance R, charging capacitor C2 and C3, electric discharge output capacitor C1, charging diode D2 and D4, discharge diode D1, D3 and D5, voltage grading control circuit M and voltage grading control pipe BG3; Described output circuit 4 by output+, output-and load LEDZ lamp group form.
In such scheme, in described control circuit 2, control chip K is by MOSFET pipe semibridge system two-way drived control chip (inside is provided with high-end suspension driver) carrying oscillator, supply power voltage is provided, for the high-end suspended grid driver functions of bootstrap type is powered by bootstrap capacitor and diode; Or control chip is recommended in employing, there is chip controls on a road, the high-end suspended grid driver control of another route bootstrap type.
In such scheme, when for low-power LED driving power, the integrated circuit (IC) chip be integrated into by charging valve BG1 and discharge tube BG2 in control chip K can be adopted.
Each circuit connecting relation of this power supply is as follows, input L with N is connected respectively to two of bridge rectifier D Q in rectification circuit 1 and exchanges end, and the negative pole of the discharge diode D1 in the output cathode of bridge rectifier D Q+hold with the f of the voltage grading control circuit M in the one end of the starting resistance RJ in one end of filtering capacitor Cb, control circuit 2, control circuit 2, charge-discharge circuit 3 is connected with the positive pole of the output+in one end of the negative pole of discharge diode D3, the output capacitor C1 that discharges, output circuit 4 and LEDZ lamp group, the other end of filtering capacitor Cb is held with the c in the negative pole one of bridge rectifier D Q, control circuit 2K and is connected with the negative electrode of the charging valve BG1 in circuit, the other end of the starting resistance RJ in control circuit 2 is held with a of control chip K and is connected, the b end of control chip K is connected with the grid of the charging valve BG1 in charge-discharge circuit 3, the d end of control chip K is connected with the grid of the discharge tube BG2 in charge-discharge circuit 3, and the e end of control chip K connects with the negative electrode of the discharge tube BG2 in charge-discharge circuit 3, the g end of the voltage grading control circuit M in charge-discharge circuit in 3 is connected with the grid of grading control pipe BG3, and the h end of voltage grading control circuit M is connected with the negative electrode of discharge tube BG2 with the negative electrode of grading control pipe BG3, the positive pole of discharge diode D5, the other end of charging capacitor C3, the positive pole of the discharge diode D1 in charge-discharge circuit is connected with the negative pole of charging diode D2 with one end of charging capacitor C2, the other end of charging capacitor C2 and the positive pole of charging diode D4, the negative pole of discharge diode D5 is connected with the anode of voltage grading control pipe BG3, the negative pole of charging diode D4 is connected with one end of charging capacitor C3 with the positive pole of discharge diode D3, the positive pole of charging diode D2 is connected with the other end of the anode of discharge tube BG2 with current-limiting resistance R (inductance), one end of current-limiting resistance R exports charging capacitor C1 with electric discharge, the negative pole of the output-in output circuit 4 and the LEDZ lamp group in circuit is connected.
The operation principle of this power supply is, alternating current is after rectification, control electric current after an electric discharge output capacitor is in parallel with LEDZ lamp pearl group by charging valve, through the positive pole of a current-limiting resistance (or inductance), a charging diode to a charging capacitor, to another charging capacitor, tandem is carried out to these three electric capacity through an other charging diode again and to charge control; Have no progeny when a charging valve closes, after Dead Time, another discharge tube controls the negative pole of electric current through same current-limiting resistance (or inductance), a positive pole through discharge diode and the 3rd discharge diode, and another charging capacitor carries out parallel electric discharge through the positive pole of an other discharge diode to output capacitor and LEDZ lamp pearl group; Output capacitor both end voltage is LED driving voltage; A charging valve and another discharge tube alternate conduction in complementary fashion, centre is provided with dead band, and its operating frequency is 20KHZ-200KHZ; When AC sine waveform voltage reaches certain certain value, grading control control circui the 3rd MOSFET grading control pipe BG3 conducting, by an other charging capacitor and an other charging diode short circuit, realizes charging voltage and automatically becomes level control.
During work, input L and N accesses mains electricity, alternating current is through bridge rectifier D Q rectification with by filtering capacitor Cb filtering, for control circuit 2 and charge-discharge circuit 3 provide DC pulse moving voltage, control chip K in control circuit 2 controls charging valve BG1 conducting through starting resistance RJ, and electric current carries out tandem charging through current-limiting resistance R, electric discharge output capacitor C1, charging diode D2, charging capacitor C2, charging diode D4, charging capacitor C3 to three capacitors; When charging valve BG1 turns off, after Dead Time, by control chip K controlled discharge pipe BG2 conducting, the electric charge being stored in charging capacitor C2 through discharge diode D1 and discharge diode D5, be stored in the electric charge of charging capacitor C3 through discharge diode D3, carry out parallel electric discharge through discharge resistance R to electric discharge output capacitor C1; When f and the h end of grading control circuit M detect the voltage after AC rectification low to certain certain value time, grading control pipe BG3 conducting is controlled through g end, by charging diode D4 and charging capacitor C3 short circuit, control charge-discharge circuit 3 and change dividing potential drop progression, realize automatic level number conversion, to improve power utilization rate, and then improve power factor and power supply conversion efficiency.Fill with in discharge process at charge-discharge circuit 3, electric discharge output capacitor C1 accepts charging, and power to load LEDZ lamp, control chip K controls charging valve BG1 and the complementary break-make of discharge tube BG2, centre is provided with dead band, with operating frequency controlled discharge output capacitor C1, the charging capacitor C2 of 20KHZ-200KHZ and the work of C3 cycle charge-discharge, produce output dc voltage at electric discharge output capacitor C1 two ends, provide to load LEDZ lamp group the burning voltage being changed to linear relationship power output with AC-input voltage.
The beneficial effect of this power supply is, owing to adopting two partial pressure type charge/discharge operation, further increases input ac voltage and output dc voltage ratio, and then reduces the quantity of output voltage and LED lamp bead, improve the reliability of light fixture; Because electric discharge output capacitor C1 has electric current to pass through when discharge and recharge, and order adopts automatic classification to power, and reduces ripple current, and then reduces the use capacity of electric discharge output capacitor C1.This power supply is suitable for lamp pearl quantity to be changed between 6-20, and power factor is 0.94-0.99, and efficiency can reach 85%-96%.
Claims (10)
1. a condenser type linear convergent rate LED drive power, is characterized in that: after AC rectification, controls at least one charging capacitor charge by a charging valve through a current-limiting resistance (or inductance); A discharge tube controls at least one charge and discharge capacitance device through same current-limiting resistance (or inductance) and carries out parallel electric discharge to electric discharge output capacitor, and electric discharge output capacitor both end voltage is LED driving voltage; A charging valve and discharge tube alternate conduction in complementary fashion, centre is provided with dead band, and achieve the linear convergent rate of AC-input voltage to LED load and DC output power, its operating frequency is 20KHZ-200KHZ.
2. condenser type linear convergent rate LED drive power according to claim 1, is characterized in that: a kind of condenser type linear convergent rate LED drive power is made up of input L and N, rectification circuit (1), control circuit (2), charge-discharge circuit (3), output circuit (4); Described rectification circuit (1) is made up of bridge rectifier D Q and filter capacitor Cb; Described control circuit (2) is made up of MOSFET pipe semibridge system drived control chip K (its inside is provided with high-end suspension driver) and starting resistance RJ carrying oscillator; Described charge-discharge circuit (3) is made up of charging valve BG1, discharge tube BG2, current-limiting resistance R, charging capacitor C2 and electric discharge output capacitor C1; Described output circuit (4) by output+, output-and load in series lamp group LEDZ form.
3. condenser type linear convergent rate LED drive power according to claim 1 and 2, it is characterized in that: a kind of each circuit connecting relation of condenser type linear convergent rate LED drive power is as follows: input L with N is connected respectively to two of bridge rectifier D Q in rectification circuit (1) and exchanges end, one end of the output cathode of bridge rectifier D Q+connect filtering capacitor Cb, the other end of the negative pole of bridge rectifier D Q-connect filtering capacitor Cb, the positive pole of the bridge rectifier D Q in rectification circuit (1) connects with the one end of the starting resistance RJ in control circuit (2), the other end of starting resistance RJ is held with the startup a of control chip K and is connected, the output negative pole of bridge rectifier D Q-be connected with the negative electrode of the c end in the interior control chip K of control circuit (2) and the charging valve BG1 in charge-discharge circuit (3), the grid of the charging valve BG1 in described charge-discharge circuit (3) is held with the b of the control chip K in control circuit (2) and is connected, the anode of charging valve BG1 and the one end of the charging capacitor C2 in charge-discharge circuit (3) are held with the e of the control chip in the negative electrode of discharge tube BG2 and control circuit (2) and are connected, the other end of charging capacitor C2 is connected with one end of current-limiting resistance R, the other end of current-limiting resistance R is connected with the bridge rectifier D Q positive pole of rectification circuit (1) with the one end of the electric discharge output capacitor C1 in charge-discharge circuit (3), the other end of electric discharge output capacitor C1 and the anode of discharge tube BG2, output-in output circuit (4) and the negative pole of load LEDZ are connected, the grid of discharge tube BG2 is held with the d of control chip K and is connected, output in output circuit (4)+be connected with the one end of the electric discharge output capacitor C1 in positive pole and the charge-discharge circuit (3) of load LEDZ.
4. a condenser type one dividing potential drop linear convergent rate LED drive power, it is characterized in that: after AC rectification, an electric discharge output capacitor and LED lamp bead group in parallel, control electric current by a charging valve and carry out tandem charging via a current-limiting resistance (or inductance), charging diode to electric discharge output capacitor and a charging capacitor; Have no progeny when a charging valve closes, after Dead Time, an electric discharge output capacitor and a charging capacitor are controlled to carry out parallel electric discharge through same current-limiting resistance (or inductance), a discharge diode by a discharge tube; Electric discharge output capacitor both end voltage is the driving voltage of LED lamp bead group, and a charging valve and discharge tube are alternate conduction in complementary fashion, and centre is provided with dead band, and its operating frequency is 20KHZ-200KHZ.
5. a kind of condenser type one dividing potential drop linear convergent rate LED drive power according to claim 4, is characterized in that: this power supply is made up of input L and N, rectification circuit (1), control circuit (2), charge-discharge circuit (3), output circuit (4); Described rectification circuit (1) is made up of bridge rectifier D Q and filter capacitor Cb; Described control circuit (2) is made up of the MOSFET pipe semibridge system drived control chip K and starting resistance RJ carrying oscillator; Described charge-discharge circuit (3) is made up of charging valve BG1, discharge tube BG2, current-limiting resistance R, charging capacitor C2 and electric discharge output capacitor C1, charging diode D2 and discharge diode D1; Described output circuit (4) by output+, output-and load LEDZ series lamp group form.
6. a kind of condenser type one dividing potential drop linear convergent rate LED drive power according to claim 4 or 5, it is characterized in that: each circuit connecting relation of this power supply is as follows, input L with N is connected respectively to two of bridge rectifier D Q in rectification circuit (1) and exchanges end, the output cathode of bridge rectifier D Q+be connected with one end of filtering capacitor Cb, the negative pole of bridge rectifier D Q-be connected with the other end of filtering capacitor Cb; The output cathode of the bridge rectifier D Q in described rectification circuit (1)+be connected with the positive pole of the output+in one end of the one end of the starting resistance RJ in control circuit (2) and the negative pole of the discharge diode D1 in charge-discharge circuit (3), the output capacitor C1 that discharges, output circuit (4) and load LEDZ, the electric discharge output capacitor C1 other end in charge-discharge circuit (3) is connected with the negative pole of one end of current-limiting resistance R with the output-in output circuit and LED group; The other end of current-limiting resistance R (inductance) is connected with the positive pole of charging diode D2 with the anode of discharge tube BG2; The output negative pole of the bridge rectifier D Q in rectification circuit (1)-with the c of the control chip K in described control circuit (2) is held and the negative electrode of charging valve BG1 in described charge-discharge circuit (3) is connected; The other end of starting resistance RJ in described control circuit (2) is held with a of control chip K and is connected, b end on control chip K is connected with the grid of the charging valve BG1 of charge-discharge circuit (3), the d end of control chip K is connected with the grid of the discharge tube BG2 in charge-discharge circuit (3), and the e end on control chip K is connected with the negative electrode of the discharge tube BG2 in charge-discharge circuit (3); The positive pole of the discharge diode D1 in charge-discharge circuit (3) is connected with one end of charging capacitor C2 with the negative pole of charging diode D2, and the other end of charging capacitor C2 is connected with the negative electrode of discharge tube BG2 with the anode of charging valve BG1.
7. a condenser type two dividing potential drop linear convergent rate LED drive power, it is characterized in that: alternating current is after rectification, control electric current after an electric discharge output capacitor is in parallel with LEDZ lamp pearl group by charging valve, through the positive pole of a current-limiting resistance (or inductance), a charging diode to a charging capacitor, to another charging capacitor, tandem is carried out to these three electric capacity through an other charging diode again and to charge control; Have no progeny when a charging valve closes, after Dead Time, another discharge tube controls the negative pole of electric current through same current-limiting resistance (or inductance), a positive pole through discharge diode and the 3rd discharge diode, and another charging capacitor carries out parallel electric discharge through the positive pole of an other discharge diode to output capacitor and LEDZ lamp pearl group; Output capacitor both end voltage is LED driving voltage; A charging valve and another discharge tube alternate conduction in complementary fashion, centre is provided with dead band, and its operating frequency is 20KHZ-200KHZ; When AC sine waveform voltage reaches certain certain value, grading control control circui the 3rd MOSFET grading control pipe BG3 conducting, by an other charging capacitor and an other charging diode short circuit, realizes charging voltage and automatically becomes level control.
8. a kind of condenser type two dividing potential drop linear convergent rate LED drive power according to claim 7, is characterized in that: this power supply is made up of input L and N, rectification circuit (1), control circuit (2), charge-discharge circuit (3), output circuit (4); Described rectification circuit (1) is made up of bridge rectifier D Q and filter capacitor Cb; Described control circuit (2) is made up of the MOSFET pipe semibridge system drived control chip K and starting resistance RJ carrying oscillator; Described charge-discharge circuit (3) is made up of charging valve BG1, discharge tube BG2, current-limiting resistance R, charging capacitor C2 and C3, electric discharge output capacitor C1, charging diode D2 and D4, discharge diode D1, D3 and D5, voltage grading control circuit M and voltage grading control pipe BG3; Described output circuit (4) by output+, output-and load LEDZ lamp group form.
9. a kind of condenser type two dividing potential drop linear convergent rate LED drive power according to claim 7 or 8, it is characterized in that: each circuit connecting relation of this power supply is as follows, input L with N is connected respectively to two of bridge rectifier D Q in rectification circuit (1) and exchanges end, the output cathode of bridge rectifier D Q+with one end of filtering capacitor Cb, the one end of starting resistance RJ in control circuit (2), the f end of the voltage grading control circuit M in control circuit (2), the negative pole of the discharge diode D1 in charge-discharge circuit (3) and the negative pole of discharge diode D3, one end of electric discharge output capacitor C1, the positive pole of the output+in output circuit (4) and LEDZ lamp group is connected, the other end of filtering capacitor Cb is held with the c in the negative pole one of bridge rectifier D Q, control circuit (2) K and is connected with the negative electrode of the charging valve BG1 in circuit, the other end of the starting resistance RJ in control circuit (2) is held with a of control chip K and is connected, the b end of control chip K is connected with the grid of the charging valve BG1 in charge-discharge circuit (3), the d end of control chip K is connected with the grid of the discharge tube BG2 in charge-discharge circuit (3), and the e end of control chip K connects with the negative electrode of the discharge tube BG2 in charge-discharge circuit (3), the g end of the voltage grading control circuit M in charge-discharge circuit in (3) is connected with the grid of grading control pipe BG3, and the h end of voltage grading control circuit M is connected with the negative electrode of discharge tube BG2 with the negative electrode of grading control pipe BG3, the positive pole of discharge diode D5, the other end of charging capacitor C3, the positive pole of the discharge diode D1 in charge-discharge circuit (3) is connected with the negative pole of charging diode D2 with one end of charging capacitor C2, the other end of charging capacitor C2 and the positive pole of charging diode D4, the negative pole of discharge diode D5 is connected with the anode of voltage grading control pipe BG3, the negative pole of charging diode D4 is connected with one end of charging capacitor C3 with the positive pole of discharge diode D3, the positive pole of charging diode D2 is connected with the other end of the anode of discharge tube BG2 with current-limiting resistance R (inductance), one end of current-limiting resistance R exports charging capacitor C1 with electric discharge, the negative pole of the output-in output circuit 4 and the LEDZ lamp group in circuit is connected.
10. a kind of condenser type linear convergent rate LED drive power according to claim 1,4 or 7, it is characterized in that: charging valve BG1 and discharge tube BG2 in described charge-discharge circuit (3), the one in IGBT, MOSFET and power crystal triode can be selected.
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| CN201510371681.7A CN105050248A (en) | 2015-06-29 | 2015-06-29 | Capacitive linear output LED driving power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108556632A (en) * | 2018-06-10 | 2018-09-21 | 重庆三三电器股份有限公司 | A kind of intelligence TFT instrument screen intensity wake-up circuits and its control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130076253A1 (en) * | 2011-09-26 | 2013-03-28 | Samsung Electro-Mechanics Co., Ltd. | Light emitting diode driving apparatus |
| CN103347329A (en) * | 2013-06-22 | 2013-10-09 | 潍坊晶兰电源技术有限公司 | LED driving circuit |
| CN203537623U (en) * | 2013-10-18 | 2014-04-09 | 河北工业大学 | LED driving power supply |
| CN203590524U (en) * | 2013-09-10 | 2014-05-07 | 深圳市晟碟半导体有限公司 | LED driving device |
-
2015
- 2015-06-29 CN CN201510371681.7A patent/CN105050248A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130076253A1 (en) * | 2011-09-26 | 2013-03-28 | Samsung Electro-Mechanics Co., Ltd. | Light emitting diode driving apparatus |
| CN103347329A (en) * | 2013-06-22 | 2013-10-09 | 潍坊晶兰电源技术有限公司 | LED driving circuit |
| CN203590524U (en) * | 2013-09-10 | 2014-05-07 | 深圳市晟碟半导体有限公司 | LED driving device |
| CN203537623U (en) * | 2013-10-18 | 2014-04-09 | 河北工业大学 | LED driving power supply |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108556632A (en) * | 2018-06-10 | 2018-09-21 | 重庆三三电器股份有限公司 | A kind of intelligence TFT instrument screen intensity wake-up circuits and its control method |
| CN108556632B (en) * | 2018-06-10 | 2023-08-25 | 重庆三三电器股份有限公司 | Intelligent TFT instrument screen brightness wake-up circuit and control method thereof |
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