CN102076138A - Electric supply input LED (Light Emitting Diode) constant current driver - Google Patents

Electric supply input LED (Light Emitting Diode) constant current driver Download PDF

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Publication number
CN102076138A
CN102076138A CN2009102415111A CN200910241511A CN102076138A CN 102076138 A CN102076138 A CN 102076138A CN 2009102415111 A CN2009102415111 A CN 2009102415111A CN 200910241511 A CN200910241511 A CN 200910241511A CN 102076138 A CN102076138 A CN 102076138A
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switch
current
connects
output
led
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CN2009102415111A
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CN102076138B (en
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魏学业
于冬
刘彬
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Beijing Jiaotong University
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Beijing Jiaotong University
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Abstract

The invention relates to an electric supply input LED (Light Emitting Diode) constant current driver. The LED constant current driver comprises a power supply converter and a current controller; the current controller comprises a current detector, an oscillator, an error amplifier, an integrator, a comparator, a latch, a switch driver, a switch, a diode, an inductor and a band-gap reference voltage source; and the integrator integrates a difference signal output by the error amplifier and outputs a sawtooth voltage signal. A new current control method, i.e. an I2 control method, is designed on the basis of an improved Buck driving circuit, and the width of a pulse signal is regulated by utilizing a difference integral of a detection signal and a reference signal, so that the average value of voltages Vcs during connection of a single-period switch in a steady state is equal to a reference voltage Vref, and the steady state error of average currents is eliminated, therefore, the average currents are precise. The electric supply input LED constant current driver has a better adjusting function and a more obvious control function as comparison with a common current control circuit.

Description

A kind of civil power input LED constant-flow driver
Technical field
The invention belongs to city's electric lighting field of LED, be specifically related to a kind of civil power input illumination LED constant-flow driver.
Background technology
LED is because numerous advantages such as the life-span is long, photoelectric conversion efficiency is high, energy-conserving and environment-protective, response time weak point become the focus that lighting field is paid close attention to, and development in recent years is rapid unusually.Use day by day simultaneously widely in the LED illumination, led drive circuit also faces more challenges, as must handling increasing electric current.Because very little voltage fluctuation meeting causes the bigger variation of LED electric current, therefore for preventing that LED from damaging, the electric current that then needs the special driving circuit to control each LED in the led array keeps constant.Because the LED illumination needs light modulation or more complicated controlled attribute, must provide the various control strategy in addition for this reason.
As shown in Figure 1, there is the not enough and relatively poor shortcoming of current stabilization ability of the precision of voltage regulation in traditional constant voltage driving mode.Because LED is an electric current responsive type device, during operate as normal, the change in voltage that stabilized voltage power supply is very little can cause the bigger variation of LED electric current.Along with the variation of LED electric current, the brightness meeting of LED is bright inconsistent, also can make that whole electrorheological is big because of the damage of LED group certain LED of the inside simultaneously, cause the whole LED group to be damaged and the lost of life easily, thereby this drive circuit is badly in need of improvement.
In order to overcome the drawback of constant voltage driving mode, extensively adopt constant current drive mode now.As shown in Figure 2, the control strategy that present constant-flow driver generally adopts: detect the electric current among the LED, and with it as feedback signal, error amplifier A11 amplifies the difference of the reference voltage V ref that the current feedback voltage Vcs of current detector F11 output and bandgap voltage reference U13 export, and the difference amplifying signal sent into pulse duration (PWM) modulator U11, PWM modulator U11 produces the respective pulses bandwidth modulation signals according to the amplitude of difference signal, switch driver U12 comes the conducting of control switch Q11 to turn-off according to pulse width modulating signal, inductance L 11 is discharged and recharged, and average current is constant among the LED that keeps flowing through.But the tactful follow-up control of this kind is poor, causes the electric current among the LED to vibrate near desired value easily, and stabilizing power is poor.
Summary of the invention
In order to address the above problem, the present invention is proposed, and the purpose of this invention is to provide that a kind of circuit structure is simple, good stability, cost is low, precision of steady current is high and conversion efficiency is high New LED constant-flow driver.
In order to realize above-mentioned purpose, the present invention takes following technical scheme: a kind of civil power input LED constant-flow driver comprises: power supply changeover device becomes direct current to the civil power of input through full-bridge rectification, filtering; Current controller, discharges and recharges inductance, the current constant in the led circuit that keeps flowing through at the conducting turn-off time by control switch.
According to an aspect of the present invention, power supply changeover device comprises: rectifier bridge converts the alternating voltage of input to direct voltage; The electrochemical capacitor of two parallel connections carries out filtering to direct voltage, and the alternating component in the filtering direct voltage keeps the stable of output voltage.
Current controller comprises: current detector, oscillator, error amplifier, integrator, comparator, latch, switch driver, switch, diode, inductance, bandgap voltage reference; Integrator wherein carries out integration, output sawtooth voltage signal to the difference signal of error amplifier output;
Current controller each several part annexation is: an end of current detector is connected with the source electrode of switch, other end ground connection; The grid of switch connects the output of switch driver, the drain electrode of switch connects the anode of diode and first end of inductance, the negative electrode of diode connects the anode of load LED group, the negative electrode of the second termination load LED group of inductance, the in-phase input end of error amplifier connects reference voltage, inverting input connects the output feedback voltage of current detector, the input of output termination integrator, the output of integrator connects the reverse input end of comparator, the output feedback voltage of importing the termination current detector in the same way of comparator, the output of the termination comparator that resets of latch, the clock signal that set termination oscillator produces, in-phase output end connects switch driver.
Beneficial effect of the present invention is: the LED constant-flow driver according to above technical scheme proposes, based on improved Buck drive circuit, designed new current control method-I 2Control method, utilize the difference integration of detection signal and reference signal to come the width of regulating impulse signal, the mean value of single cycle switch conduction period voltage Vcs equals reference voltage V ref when making stable state, eliminates the steady-state error of average current, thus accurate average current.Have than the better adjusting function of common current control circuit, the effect of control is more obvious.
Description of drawings
Fig. 1 shows the structure of traditional constant voltage driving mode;
Fig. 2 shows the structure of the control structure that present LED constant-flow driver generally adopts;
Fig. 3 shows the primary structure schematic diagram of the LED constant-flow driver of the present invention's proposition.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below.Below will describe a kind of exemplary embodiment of the present invention in detail.
A kind of civil power input LED constant-flow driver comprises: power supply changeover device becomes direct current to the civil power of input through full-bridge rectification, filtering; Current controller, discharges and recharges inductance, the current constant in the led circuit that keeps flowing through at the conducting turn-off time by control switch.
According to an aspect of the present invention, power supply changeover device comprises: rectifier bridge converts the alternating voltage of input to direct voltage; The filter capacitor of two parallel connections carries out filtering to direct voltage, and the alternating component in the filtering direct voltage keeps the stable of output voltage.
The LED constant-flow driver drives load LED group 30, and this load LED group 30 is as throwing light on inside and outside high-power illumination lamp, LCD backlight, indicator light and the automobile.
As shown in Figure 3, the LED constant-flow driver comprises power supply changeover device 20 and current controller 10.
Power supply changeover device 20 comprises: rectifier bridge D22, electrochemical capacitor C21, C22.Rectifier bridge D22 carries out full-wave rectification to the alternating current of input, becomes direct current; Capacitor C 21, C22 in parallel carry out filtering to direct current, the alternating component in the filtering direct current.
Current controller 10 makes the electric current I o that flows in load LED group 30 reach predetermined current value.Here, predetermined value represents to be applied to the electric current of load LED group 30.
Current controller 10 comprises current detector F21, oscillator T21, error amplifier A21, integrator J21, comparator A22, latch U21, switch driver U22, switch Q21, diode D21, inductance L 21, bandgap voltage reference U23.
Current detector F21 detects the electric current I o that flows in load LED group 30.Current detector F21 can realize that wherein, the end of current detector F21 is connected with the source electrode of switch Q21, the other end ground connection of current detector F21 with the resistor of predetermined resistance.In this embodiment, the electric current I o that flow in load LED group 30 can calculate according to the resistance that electric current I o flows through the voltage and current detector F21 that current detector F21 produces.Certainly, under situation about not departing from the scope of the present invention with spirit, any current detector that other is fit to can both be as the current detector of design alternative.
The grid of switch Q21 connects the output of switch driver U22, and the drain electrode of switch Q21 connects the anode of diode D21 and first end of inductance L 21.The negative electrode of diode D21 connects the anode of load LED group 30.The negative electrode of the second termination load LED group 30 of inductance L 21.Preferably, switch Q21 realizes with N road ditch metal oxide semiconductor field effect tube (NMOSFET).
The conducting off state of the big or small determine switch Q21 of voltage on the switch Q21 grid.When switch Q21 conducting, electric current flows through inductance L 21, inductive current i LIncrease; When switching tube Q21 turn-offed, inductive current was by diode D21 afterflow, inductive current i LDescend.LED20 connects with inductance L 21, is i so flow through the electric current of LED20 L
The in-phase input end of error amplifier A21 meets reference voltage V ref, and inverting input meets the output feedback voltage V cs of current detector F21, the input of output termination integrator J21.The output of integrator J21 connects the reverse input end of comparator A22.The output feedback voltage V cs that imports termination current detector F21 in the same way of comparator A22.During switch Q21 conducting, feedback voltage V cs approximately linear rises, and error amplifier A21 asks difference and amplification with feedback voltage V cs and reference voltage V ref, and the difference signal after will amplifying is sent into integrator J21.Integrator J21 carries out integration to difference signal, produces a sawtooth voltage signal, and this signal is outputed to the reverse input end of comparator A22.Comparator A22 compares the pulse width modulating signal that output duty cycle is adjustable with the sawtooth voltage signal with feedback Vcs.
The reset terminal R of latch U21 connects the output of comparator A22, and set end S connects the clock signal that oscillator T21 produces, and in-phase output end Q meets switch driver U22.When comparator A22 was output as high level, Q held output logic 0, switch driver U22 output LOW voltage signal, the shutoff of switch S.When comparator A22 was output as low level, Q end output logic was determined that by clock signal when clock was high level, Q held output logic 1, switch driver U22 output HIGH voltage signal, switch S conducting; When clock was low level, the Q end was output as and keeps last state.Like this, till the current controller 10 of this embodiment just can come the length of the conducting turn-off time of control switch Q21 to come the Control current Io value of making it by the electric current I o that detection is flowed in load LED group 30.
The LED constant-flow driver of the embodiment of the invention, constant current output, electric current is adjustable, from tens milliamperes to 1 ampere, is applicable to the application of the great power LED of a plurality of series connection; Circuit structure is simple, and peripheral component is few, and production cost is low, and conversion efficiency can be greater than 90%; Be applicable to the 1W-3W high-power LED illuminating lamp, the illuminating lamp of the back lighting of large-screen LCD, LED signal lamp, warning lamp, emergency light, mine lamp and various glow colors, the illuminating lamp of public place, inside and outside illumination of automobile and signal lamp.
More than described a kind of embodiment of the present invention, can change these embodiment not breaking away from the principle of the present invention that limits by claim and equivalent thereof and the situation of spirit.

Claims (2)

1. a civil power is imported the LED constant-flow driver, comprising:
Power supply changeover device becomes direct current to the civil power of input through full-bridge rectification, filtering;
Current controller, discharges and recharges inductance, the current constant in the led circuit that keeps flowing through at the conducting turn-off time by control switch;
Wherein, power supply changeover device is made up of the electrochemical capacitor of rectifier bridge, two parallel connections; Current controller comprises: current detector, oscillator, error amplifier, comparator, latch, switch driver, switch, diode, inductance, bandgap voltage reference;
It is characterized in that: in current controller, also comprise: integrator, the difference signal that error amplifier is exported carries out integration, output sawtooth voltage signal;
Current controller each several part annexation is: an end of current detector (F21) is connected other end ground connection with the source electrode of switch (Q21); The grid of switch (Q21) connects the output of switch driver (U22), the drain electrode of switch (Q21) connects the anode of diode (D21) and first end of inductance (L21), the negative electrode of diode (D21) connects the anode of load LED group, the negative electrode of the second termination load LED group of inductance (L21), the in-phase input end of error amplifier (A21) connects reference voltage, inverting input connects the output feedback voltage of current detector (F21), the input of output termination integrator (J21), the output of integrator (J21) connects the reverse input end of comparator (A22), the output feedback voltage of the current detector of input termination in the same way (F21) of comparator (A22), the reset terminal (R) of latch (U21) connects the output of comparator (A22), set end (S) connects the clock signal that oscillator (T21) produces, and in-phase output end (Q) connects switch driver (U22).
2. a kind of civil power input LED constant-flow driver as claimed in claim 1, it is characterized in that: the switch in the current controller (Q21) selects for use N road ditch metal oxide semiconductor field effect tube to realize.
CN 200910241511 2009-11-25 2009-11-25 Electric supply input LED (Light Emitting Diode) constant current driver Expired - Fee Related CN102076138B (en)

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