CN101808444A - Constant-current control method of power switch type LED (Light-Emitting Diode) drive circuit and circuit thereof - Google Patents
Constant-current control method of power switch type LED (Light-Emitting Diode) drive circuit and circuit thereof Download PDFInfo
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Abstract
The invention relates to a constant-current control method of a power switch type LED drive circuit and a circuit thereof. The method comprises the following steps of: setting a reference voltage value corresponding to the constant average current value of an LED lamp group and the sustainable turn-off time T2 of a power switch; opening the power switch to acquire an induced voltage corresponding to the working current of the LED lamp group, and comparing the induced voltage and the reference voltage value; accumulating the sustainable opening time Ta of the power switch since the power switch is opened until the induced voltage reaches the reference voltage value; accumulating the sustainable opening time Tb of the power switch since the induced voltage of the LED lamp group reaches the induced voltage value, when Tb is equal to Ta, turning off the power switch; and since the power switch is turned off, timing the sustainable turn-off time of the power switch, and after the set sustainable turn-off time T2 is reached, opening the power switch. The invention realizes the direct control on average current and improves the control precision on the current.
Description
Technical field
The present invention relates to the constant current control method and the circuit thereof of power switch type led drive circuit.
Background technology
Every field such as that characteristics such as everyone knows, along with the fast development of light-emitting diode (LED) manufacturing technology, led light source is efficient because of it, reliable, lasting, energy-conserving and environment-protective have been widely used in is backlight, automotive lighting and general illumination.LED itself is the constant-current type device, and that is to say needs constant electric current to drive to keep reliablely and stablely luminous.And in the middle of practical application most of electric energy the source is provided is constant pressure source, therefore need specific led drive circuit to extract electric energy and supply with LED from power supply with the form of constant current.
The led drive circuit of main flow mainly is divided into two classes at present: linear current type and switching current type.The led drive circuit structure of linear current type as shown in Figure 1, circuit produces a linear DC constant-current source directly with the LED series connection, controls the drive current of LED by the electric current of control dc constant current power supply.Such control mode is all mentioned in People's Republic of China's patent 200710193834.9 documents such as grade.The major advantage of linear current type drive circuit is that control precision is higher, current ripples is little, system is simple and reliable relatively.But relatively poor relatively because of its efficient, its application in the great power LED drive system has been subjected to serious restriction.
Compare linear current type led drive circuit, switching current type led drive circuit has significant odds for effectiveness.Its circuit principle structure figure as shown in Figure 2.By energy storage device inductance and controlled switch, drive circuit can be constant with the Average Current Control among the LED.Certainly, switching current type circuit is comparatively complicated comparatively speaking, and control precision and current ripples are also often not as linear current type circuit.But along with the continuous progress of circuit design technique, these inferior positions are constantly dwindled, and make switching current type circuit become LED and drive the main flow scheme in driving of great power LED particularly.
Traditional switching current type led drive circuit is to come Control current in the mode of peak current detection.For example, the product HV9910 of U.S. SuperTex company that mentions of People's Republic of China's patent 200510124707.4 is to work in the mode of peak current detection as the representative that great power LED on the market drives product.Although the peak current detection circuit is comparatively simple and reliable, its control precision is relatively poor, and particularly load regulation (Load Regulation) is low is its disadvantage always, and brings many inconvenience for the application of product.At this problem, each company has proposed some corresponding solutions, detects simultaneously as peak value, valley point current, improves current precision and load regulation.But these schemes are often comparatively complicated.Owing to need more peripheral components, increased the reliability that system cost has reduced system, complicated simultaneously scheme has also been brought bigger obstacle to the client in application facet.
Summary of the invention
The circuit that technical problem to be solved by this invention is to provide a kind of constant current control method of power switch type led drive circuit and implements this method, it can improve Current Control precision and load regulation under the condition of the complexity that does not increase circuit devcie.
The invention provides a kind of constant current control method of power switch type led drive circuit, this power switch type led drive circuit is used for driving LED lamp group, and this method comprises:
Set and the corresponding reference voltage value of constant average current value of LED lamp group and the lasting turn-off time T2 of power switch;
Open power switch, gather the corresponding induced voltage of operating current with LED lamp group, and this induced voltage and reference voltage value are compared;
The integral power switch is from opening the lasting opening time Ta when induced voltage reaches reference voltage value;
The lasting opening time Tb of integral power switch when the induced voltage of LED lamp group reaches reference voltage value, when Tb=Ta, the switch-off power switch;
When power switch turn-offs to the lasting turn-off time timing of power switch, reach the lasting turn-off time T2 of setting after, open power switch.
The present invention also provides a kind of led drive circuit of non-peak current detection, be used for driving LED lamp group, this led drive circuit comprises energy storage inductor, fly-wheel diode, power switch, current detection circuit, power switch control circuit and power supply, the positive pole of LED lamp group links to each other with the positive pole of power supply, negative pole links to each other with first end of energy storage inductor, and second end of energy storage inductor links to each other with the drain electrode of power switch; The positive pole of fly-wheel diode links to each other with the drain electrode of power switch, and negative pole links to each other with the positive pole of LED lamp group; The input of current detection circuit links to each other with the source electrode of power switch, output links to each other with the input of power switch control circuit, the output of power switch control circuit links to each other with the grid of power switch, current detection circuit comprises LED operating current sample circuit and voltage comparator circuit, and power switch control circuit comprises open control circuit, switches off control circuit and the grid drive circuit; Wherein:
LED operating current sample circuit links to each other with the source electrode of power switch, is used to gather the corresponding induced voltage of operating current with LED lamp group;
Voltage comparator circuit compares induced voltage and reference voltage value, and controls described open control circuit according to comparative result;
Open control circuit, integral power switch be from opening the lasting opening time Ta when described induced voltage reaches reference voltage value, and the lasting opening time Tb of integral power switch when the induced voltage of LED lamp group reaches reference voltage value; When Tb=Ta,, trigger to switch off control circuit picking up counting simultaneously by grid drive circuit switch-off power switch;
Switch off control circuit, be used for the turn-off time T2 of setting power switch, and when power switch turn-offs to the lasting turn-off time timing of power switch, reach the lasting turn-off time T2 of setting after, open power switch by the grid drive circuit;
The grid drive circuit links to each other with the grid of power switch, is used for the break-make of power controlling switch.
As a kind of preferred implementation of the present invention, open control circuit comprises MUX, summary counter and zero cross detection circuit; Wherein: the control end of MUX links to each other with the output of described current detection circuit, and output links to each other with the input of summary counter; Summary counter couples with switching off control circuit; Zero cross detection circuit is used to detect the output valve of stored count device, when the output valve of zero passage testing circuit is zero, drives grid drive circuit switch-off power switch, trigger simultaneously described switch off control circuit pick up counting.
As another kind of preferred implementation of the present invention, open control circuit comprises ON-OFF control circuit, diverter switch, first constant-current source, second constant-current source, electric capacity and comparator; Wherein, the input of ON-OFF control circuit and current detection circuit couple with switching off control circuit, and are used for the change action of control its switch; Diverter switch couples with first constant-current source, second constant-current source and electric capacity respectively, optionally makes the electric capacity and first constant-current source formation electric capacity charge circuit or constitutes the capacitor discharge loop with second constant-current source; Comparator compares capacitance voltage and ground potential, when the magnitude of voltage of electric capacity is zero, by grid drive circuit switch-off power switch, triggers to switch off control circuit picking up counting simultaneously.
The present invention makes the interior open-interval mid point of the switch periods of each power switch corresponding with average current value, thereby has realized the direct control to average current, so Current Control precision height, and has good load regulation.In addition, the circuit structure of power switch type led drive circuit of the present invention is simple, and the components and parts number is few, and cost is low, is convenient to implement.
Description of drawings
Fig. 1 is the structural representation of the led drive circuit of existing linear current type;
Fig. 2 is the structural representation of existing power switch type led drive circuit;
Fig. 3 is the circuit theory schematic diagram of the led drive circuit of non-peak current detection of the present invention;
Fig. 4 is the circuit theory schematic diagram of current detection circuit of the present invention;
Fig. 5 is the circuit theory schematic diagram of power switch control circuit of the present invention;
Fig. 6 is the circuit theory schematic diagram of first kind of execution mode of open control circuit of the present invention;
Fig. 7 is the circuit theory schematic diagram of second kind of execution mode of open control circuit of the present invention;
Fig. 8 is the schematic diagram of the constant current control method of power switch type led drive circuit of the present invention.
Embodiment
Fig. 3 shows the circuit theory schematic diagram of the led drive circuit of non-peak current detection of the present invention.The led drive circuit 1 of non-peak current detection of the present invention is used for driving LED lamp group 2, and this LED lamp group 2 LED by a LED or a plurality of mutual series connection form.Led drive circuit 1 comprises fly-wheel diode 3, energy storage inductor 4, power switch 5, current detection circuit 6, power switch control circuit 7 and power supply 8, the positive pole of LED lamp group 2 links to each other with the positive pole of power supply 8, negative pole links to each other with first end of energy storage inductor 3, and second end of energy storage inductor 3 links to each other with the drain electrode of power switch 5.The positive pole of fly-wheel diode 3 links to each other with the drain D of power switch 5, and negative pole links to each other with the positive pole of LED lamp group 2.The input of current detection circuit 6 links to each other with the source electrode of power switch 5, and output links to each other with the input of power switch control circuit 7, and the output of power switch control circuit 7 links to each other with the grid G of power switch 5.Power switch 5 can adopt MOSFET.
As shown in Figure 4 and Figure 5, current detection circuit 6 comprises that LED operating current sample circuit 61, voltage comparator circuit 62 and comparator enable control circuit 63, and power switch control circuit 7 comprises open control circuit 71, switch off control circuit 72 and grid drive circuit 73.Wherein, LED operating current sample circuit 61 links to each other with the source S of power switch 5, is used to sample and the corresponding induced voltage Vg of the operating current of LED lamp group 2.In a kind of better embodiment, this LED operating current sample circuit 61 is a resistance R, and an end of this resistance R links to each other with the source S of power switch 5, other end ground connection, and the current information equal proportion that directly will flow through LED lamp group is converted to information of voltage.Voltage comparator circuit 62 compares above-mentioned induced voltage Vg and reference voltage value Vr, and according to comparative result control open control circuit 71.Reference voltage value Vr is representing the average current value of LED lamp group.Output and voltage comparator circuit 62 that comparator enables control circuit 63 couple, jumbo pulse in order to noise on the shielding power switch 5 blocking interval induced voltage Vg and power switch 5 are opened on the moment induced voltage Vg prevents that these interference noises and pulse from causing the misoperation of voltage comparator circuit 62.
Fig. 6 and Fig. 7 show two kinds of execution modes of open control circuit 71 respectively, and a kind of is the circuit of Digital Implementation, a kind of circuit for the simulation realization.The open control circuit of Digital Implementation mainly is made of MUX (MUX) 711, summary counter 712 and zero cross detection circuit 713.The control end of MUX711 links to each other with the output of current detection circuit 6, and output links to each other with the input of summary counter 712.Summary counter 712 couples with switching off control circuit.Zero cross detection circuit 713 is used to detect the output valve of stored count device 712, when the output valve of zero passage testing circuit 713 is zero, drives grid drive circuit 73 switch-off power switches 5, and triggering simultaneously switches off control circuit 72 picks up counting.Summary counter 712 begins from 0 counting when power switch 5 is opened, when the output signal upset of the voltage comparator circuit of current detection circuit 6 count value of summary counter 712 just corresponding lasting opening time Ta.At this moment, summary counter 712 begins to count down, and counts to 0 o'clock just switch-off power switch 5, thereby realizes Tb=Ta.The open control circuit that simulation realizes is made up of ON-OFF control circuit 715, diverter switch 716, the first constant-current source Iup, the second constant-current source Idn, capacitor C t and comparator 717.Wherein, the input of ON-OFF control circuit 715 and current detection circuit 6 and switching off control circuit 72 couples, and is used for the change action of control its switch 716.Diverter switch 716 couples with the first constant-current source Iup, the second constant-current source Idn and capacitor C t respectively, optionally makes the capacitor C t and first constant-current source Iup formation electric capacity charge circuit or constitutes the capacitor discharge loop with the second constant-current source Idn.Comparator 717 compares magnitude of voltage and the ground potential of capacitor C t, and when the magnitude of voltage of capacitor C t was zero, by grid drive circuit 73 switch-off power switches, triggering simultaneously switches off control circuit 72 picked up counting.When power switch was opened, it was 0 capacitor C t charging that the first constant-current source Iup begins to voltage, when the output signal upset of the voltage comparator circuit of current detection circuit the voltage of capacitor C t just corresponding lasting opening time Ta.At this moment, another second constant-current source Idn with onesize electric current begins to be capacitor C t discharge, just switch-off power switch 5 when the voltage of capacitor C t is 0, thus realize Tb=Ta.
Below in conjunction with Fig. 3 to Fig. 6 the course of work of the led drive circuit of the non-peak current detection of the open control circuit that adopts first kind of execution mode is described.When power switch 5 is opened, the inductive reactance R of the electric current that power supply 8 provides in LED lamp group 2, energy storage inductor 4 and power switch 5 inflow current testing circuits 6.Simultaneously, the summary counter 712 in the open control circuit 71 begins to count from zero increase.Electric current forms induced voltage Vg on inductive reactance R, voltage comparator circuit 62 compares induced voltage Vg and reference voltage value Vr.When induced voltage during less than reference voltage value, voltage comparator circuit 62 is output as 0.When induced voltage during greater than reference voltage value, the upset of the output signal of voltage comparator circuit 62 and the output of switching MUX 711 become-1 from+1, thereby make summary counter 712 beginning countdowns.When summary counter 712 counted down to 0, zero cross detection circuit 713 upsets were also passed through grid drive circuit 73 power switch 5 are turn-offed.Trigger the 72 lasting turn-off time timing that begin power switch that switch off control circuit in the time of zero cross detection circuit 713 upsets, after reaching the lasting turn-off time T2 of setting, summary counter 712 zero clearings are restarted to increase progressively counting, thereby by grid drive circuit 73 power switch 5 is opened the work of finishing a switch periods simultaneously.Power switch 5 blocking intervals, the electric current in the LED lamp group 2 is provided by fly-wheel diode 3 by energy storage inductor 4, and the working mechanism of circuit has guaranteed that the average current in the LED lamp group 2 keeps constant.
Below in conjunction with Fig. 3 to Fig. 5 and Fig. 7 the course of work of the led drive circuit of the non-peak current detection of the open control circuit that adopts second kind of execution mode is described.When power switch 5 is opened, the inductive reactance R of the electric current that power supply 8 provides in LED lamp group 2, energy storage inductor 4 and power switch 5 inflow current testing circuits 6.Simultaneously, the diverter switch 716 that the ON-OFF control circuit 715 in the open control circuit 71 will connect capacitor C t links to each other with the first constant-current source Iup, the first constant-current source Iup with constant electric current I to the capacitor C t charging of starting from scratch.Electric current forms induced voltage Vg on inductive reactance R, compare with the reference voltage V r that represents average current value by voltage comparator circuit 62.As induced voltage Vg during less than reference voltage V r, voltage comparator circuit 62 is output as 0.As induced voltage Vg during greater than reference voltage V r, the output signal upset of voltage comparator circuit 62, and switching switch control circuit 19 outputs, the diverter switch 716 that connects capacitor C t is linked to each other with the second constant-current source Idn, and the second constant-current source Idn discharges to capacitor C t with the constant electric current I identical with the first constant-current source Iup.When the voltage of capacitor C t reduced to 0, the upset of the output signal of comparator 717 was also passed through grid drive circuit 73 power switch 5 is turn-offed.The upset of comparator 717 triggers the 72 lasting turn-off time timing that begin power switch that switch off control circuit simultaneously, after reaching the lasting turn-off time T2 of setting, switching switch control circuit 19 once more, capacitor C t is linked to each other with the first constant-current source Iup by diverter switch 716, switch off control circuit simultaneously and 72 power switch 5 is opened, thereby finish the work of a switch periods by grid drive circuit 73.Power switch 5 blocking intervals, the electric current in the LED lamp group 2 is provided by fly-wheel diode 3 by energy storage inductor 4, and the working mechanism of circuit has guaranteed that the average current in the LED lamp group 2 keeps constant.
The present invention also provides a kind of constant current control method of power switch type led drive circuit, and Fig. 8 shows the principle of this method.Because be series relationship, the electric current of the LED lamp group electric current with energy storage inductor 4 all the time is equal.When power switch 5 was opened, forward voltage drop acted on energy storage inductor 4, made linear the increasing of electric current of energy storage inductor.When power switch 5 turn-offed, the negative voltage at energy storage inductor 4 two ends made the linear decline of the electric current of energy storage inductor.When control system was in stable state, the switching frequency of power switch 5 was f=1/ (Ta+Tb+T2).Flow through the average current Iavg=(Ihigh+Ilow)/2 of LED lamp group, wherein Ihigh is the maximum current that flows through LED lamp group, and Ilow is the minimum current that flows through LED lamp group.Because the electric current rise and fall are linearity, it is wavy that current waveform is triangle, and when the transient current value equated with average current, its time corresponding was put the mid point of process of rising or falling just.So, by measuring the time T a of electric current from Ilow to Iavg, the lasting ON time Tb=Ta of power switch is set, just can reach the purpose of constant Average Current Control.Because switch blocking interval LED current detection circuit can't detect the LED current information, lasting turn-off time value of being maintained fixed of power switch gets final product.
According to above-mentioned principle, the constant current control method of power switch type led drive circuit of the present invention may further comprise the steps:
Set and the corresponding reference voltage value of constant average current value of LED lamp group and the lasting turn-off time T2 of power switch.
At the adjusting and voltage-reduction switch circuit, the duty ratio D of system's operate as normal is by forward voltage drop Vled decision, i.e. D=Vled/Vin on supply voltage Vin and the LED lamp group.In addition, according to the definition of D, D=(T-T2)/T, T=1/f, f are the switching frequency frequency of power switch, and T is the switch periods of power switch.In actual applications, the user tends to the operating frequency f that wishes according to concrete application choice, and calculates D according to Vin and Vled, only needs that T2 is made as (1-D)/f this moment and gets final product.
Open power switch, gather the corresponding induced voltage of operating current with LED lamp group, and induced voltage and reference voltage value are compared.
The integral power switch is from opening the lasting opening time Ta when described induced voltage reaches described reference voltage value.
The lasting opening time Tb of integral power switch when the induced voltage of LED lamp group reaches reference voltage value, when Tb=Ta, the switch-off power switch.
When power switch turn-offs to the lasting turn-off time timing of power switch, reach the lasting turn-off time T2 of setting after, open power switch.
Claims (8)
1. the constant current control method of a power switch type led drive circuit, described power switch type led drive circuit is used for driving LED lamp group, it is characterized in that, and this method comprises:
Set and the corresponding reference voltage value of constant average current value of LED lamp group and the lasting turn-off time T2 of power switch;
Open power switch, gather the corresponding induced voltage of operating current with LED lamp group, and described induced voltage and described reference voltage value are compared;
The integral power switch is from opening the lasting opening time Ta when described induced voltage reaches described reference voltage value;
The lasting opening time Tb of integral power switch when the induced voltage of LED lamp group reaches reference voltage value, when Tb=Ta, the switch-off power switch;
When power switch turn-offs to the lasting turn-off time timing of power switch, reach the lasting turn-off time T2 of setting after, open power switch.
2. the constant current control method of switching mode led drive circuit as claimed in claim 1 is characterized in that, described LED lamp group is made up of the LED of a LED or a plurality of mutual series connection.
3. the led drive circuit of a non-peak current detection, be used for driving LED lamp group, described led drive circuit comprises energy storage inductor, fly-wheel diode, power switch, current detection circuit, power switch control circuit and power supply, the positive pole of described LED lamp group links to each other with the positive pole of power supply, negative pole links to each other with first end of described energy storage inductor, and second end of energy storage inductor links to each other with the drain electrode of described power switch; The positive pole of described fly-wheel diode links to each other with the drain electrode of power switch, and negative pole links to each other with the positive pole of LED lamp group; The input of described current detection circuit links to each other with the source electrode of power switch, output links to each other with the input of described power switch control circuit, the output of power switch control circuit links to each other with the grid of power switch, it is characterized in that: described current detection circuit comprises LED operating current sample circuit and voltage comparator circuit, and described power switch control circuit comprises open control circuit, switches off control circuit and the grid drive circuit; Wherein:
LED operating current sample circuit links to each other with the source electrode of power switch, is used to gather the corresponding induced voltage of operating current with LED lamp group;
Voltage comparator circuit compares described induced voltage and reference voltage value, and controls described open control circuit according to comparative result;
Open control circuit, integral power switch be from opening the lasting opening time Ta when described induced voltage reaches described reference voltage value, and the lasting opening time Tb of integral power switch when the induced voltage of LED lamp group reaches reference voltage value; When Tb=Ta, by grid drive circuit switch-off power switch, trigger simultaneously described switch off control circuit pick up counting;
Switch off control circuit, be used for the turn-off time T2 of setting power switch, and when power switch turn-offs to the lasting turn-off time timing of power switch, reach the lasting turn-off time T2 of setting after, open power switch by the grid drive circuit;
The grid drive circuit links to each other with the grid of power switch, is used for the break-make of power controlling switch.
4. the led drive circuit of non-peak current detection as claimed in claim 3 is characterized in that, described open control circuit comprises MUX, summary counter and zero cross detection circuit; Wherein:
MUX, control end links to each other with the output of described current detection circuit, and output links to each other with the input of summary counter;
Summary counter, with described switch off control circuit couple;
Zero cross detection circuit is used to detect the output valve of stored count device, when the output valve of zero passage testing circuit is zero, drives grid drive circuit switch-off power switch, trigger simultaneously described switch off control circuit pick up counting.
5. the led drive circuit of non-peak current detection as claimed in claim 3 is characterized in that, described open control circuit comprises ON-OFF control circuit, diverter switch, first constant-current source, second constant-current source, electric capacity and comparator; Wherein,
ON-OFF control circuit, input and described current detection circuit and described switch off control circuit couple, be used to control the change action of described diverter switch;
Diverter switch couples with first constant-current source, second constant-current source and electric capacity respectively, optionally makes the described electric capacity and first constant-current source formation electric capacity charge circuit or constitutes the capacitor discharge loop with second constant-current source;
Comparator compares capacitance voltage and ground potential, when the magnitude of voltage of electric capacity is zero, by grid drive circuit switch-off power switch, trigger simultaneously described switch off control circuit pick up counting.
6. the led drive circuit of non-peak current detection as claimed in claim 3 is characterized in that, described LED operating current sample circuit is a resistance, and an end of described resistance links to each other with the source electrode of power switch, other end ground connection.
7. the led drive circuit of non-peak current detection as claimed in claim 6 is characterized in that, described power switch is MOSFET.
8. the led drive circuit of non-peak current detection as claimed in claim 3 is characterized in that, described LED lamp group is made up of the LED of a LED or a plurality of mutual series connection.
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| CN200910046165A CN101808444A (en) | 2009-02-13 | 2009-02-13 | Constant-current control method of power switch type LED (Light-Emitting Diode) drive circuit and circuit thereof |
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Application publication date: 20100818 |