CN1964587B - A control system and device for switching type illuminant unit - Google Patents
A control system and device for switching type illuminant unit Download PDFInfo
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- CN1964587B CN1964587B CN2005101201723A CN200510120172A CN1964587B CN 1964587 B CN1964587 B CN 1964587B CN 2005101201723 A CN2005101201723 A CN 2005101201723A CN 200510120172 A CN200510120172 A CN 200510120172A CN 1964587 B CN1964587 B CN 1964587B
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Abstract
The related switch luminescent unit control system comprises: an energy-storage unit connected with target unit to receive input voltage, a discharge unit paralleled with last unit and luminescent unit, a change-over switch connected in series, a current detection unit connected with switch to output detected current signal according to luminescent unit working current when turning on the switch, and a controller connected with the detection unit and switch to output control signal according to current signal for changing switch and adjusting brightness.
Description
Technical field
The present invention relates to a kind of switching type illuminant unit control system and control device, particularly a kind ofly be applied to control luminous system of luminescence unit and control device.
Background technology
Light-emitting component is as light-emitting diode (light emission diode; LED) illumination effect is decided by the size that flows through the light-emitting component electric current, and high-current flow is crossed the illumination effect that light-emitting component will obtain high brightness, otherwise if reduce the electric current that flows through, then the brightness of light-emitting component will weaken relatively.But continue to provide high electric current can reduce the useful life of light-emitting component, and waste many electric power.
Fig. 1 is first embodiment of known luminescence unit control circuit.The illumination effect of luminescence unit among first embodiment (being made up of light-emitting component D1, D2...Dn) can be by voltage source Vcc and resistor R
1Cooperate, by adjusting output driving current I
LEDSize controlled.Drive current I wherein
LEDFor flowing through the electric current of light-emitting component D1, D2...Dn, drive current I
LEDCan learn by following formula (1):
V wherein
D1, V
D2... V
DnBe respectively the pressure drop of light-emitting component D1, D2...Dn; R
1Be resistor R
1Resistance value.
In first embodiment, major defect is that the pressure drop meeting of light-emitting component D1, D2...Dn is subjected to the characteristic of element, as the influence of technology and working temperature etc., and influences drive current I
LEDThe while resistor R
1Can cause the power loss of circuit.
Fig. 2 is second embodiment of known luminescence unit control circuit.Voltage source V among second embodiment
SElectric power uses to those light-emitting components D1, D2...Dn in order to provide fixedly.And the illumination effect of light-emitting component D1, D2...Dn can be adjusted by current source Ic.Yet, under this kind control mode, because voltage source V
SBe high pressure, the pressure drop of light-emitting component D1, D2...Dn is a low pressure, so current source Ic can produce great power loss.
Summary of the invention
In view of this, the invention provides a kind of switching type illuminant unit control system and control device, utilization is flow through the operating current of luminescence unit as FEEDBACK CONTROL, and the control luminescence unit periodically discharges and recharges, and the operating current of stabilized illumination unit is to increase the useful life of luminescence unit.
Technical scheme of the present invention is as follows:
A kind of switching type illuminant unit control system in order to the required operating current in stabilized illumination unit, is characterized in that, includes:
Energy-storage units receives input voltage, and is connected in series with this luminescence unit, in order to this operating current to be provided;
Discharge cell is connected in parallel in this energy-storage units and this luminescence unit of serial connection;
Diverter switch is connected in series in this energy-storage units of serial connection and an end of this luminescence unit;
Current detecting unit is connected in series between this diverter switch and the earth terminal, according to this operating current output sensed current signal; And
Control device is connected between this current detecting unit and this diverter switch, according to this sensed current signal output control signal; Wherein, this control device includes:
Pulse generator produces pulse width signal;
The overcurrent comparing unit receives first minimum detectable signal of this sensed current signal and setting, this sensed current signal of comparison operation and this first minimum detectable signal, and according to comparative result output reset signal;
Control signal generating unit is connected in this overcurrent comparing unit, and is connected in this pulse generator by reverse unit, according to this reset signal and this pulse width signal, via exporting this control signal with gate cell;
Delay cell is connected in this and gate cell, receives this control signal, with the output delay signal;
Comparing unit, second minimum detectable signal of this sensed current signal of comparison operation and setting, and according to comparative result output current status signal; And
Flip-flop is connected in this delay cell, this comparing unit and this pulse generator, extracts this current state signal according to this inhibit signal, and output one-period adjustment signal is to this pulse generator, in order to adjust the cycle of this pulse width signal;
Wherein, this control signal is controlled the switching of this diverter switch, makes this operating current stable.
A kind of switching type illuminant unit control device is used in the luminescence unit control system, receives equal proportion in the sensed current signal of the operating current of luminescence unit,, it is characterized in that to stablize this operating current in order to the output control signal, includes:
Pulse generator produces pulse width signal;
The overcurrent comparing unit receives this sensed current signal and first minimum detectable signal, this sensed current signal of comparison operation and this first minimum detectable signal, and according to comparative result output reset signal;
Control signal generating unit is connected in this overcurrent comparing unit, and is connected in this pulse generator by reverse unit, according to this reset signal and this pulse width signal, via exporting this control signal with gate cell;
Delay cell is connected in this and gate cell, receives this control signal, with the output delay signal;
Comparing unit, this sensed current signal of comparison operation and second minimum detectable signal, and according to comparative result output current status signal; And
Flip-flop is connected in this delay cell, this comparing unit and this pulse generator, extracts this current state signal according to this inhibit signal, and output one-period adjustment signal is to this pulse generator, in order to adjust the cycle of this pulse width signal.
A kind of switching type illuminant unit control device is used in the luminescence unit control system, receives equal proportion in the sensed current signal of the operating current of luminescence unit,, it is characterized in that to stablize this operating current in order to the output control signal, includes:
Pulse generator produces pulse width signal;
First control circuit is connected in this pulse generator, and this first control circuit is according to this pulse width signal, this sensed current signal of comparison operation and one first minimum detectable signal, and export this control signal according to comparative result; And
Second control circuit, be connected in this pulse generator and this first control circuit, this second control circuit is according to this control signal, this sensed current signal of comparison operation and second minimum detectable signal, and adjust signal to this pulse generator, in order to adjust the cycle of this pulse width signal according to the comparative result output cycle.
The invention provides a kind of switching type illuminant unit control system, comprise energy-storage units, discharge cell, diverter switch, current detecting unit and control device.It receives input voltage by energy-storage units, provide the luminescence unit that is connected in series to move required operating current: during the diverter switch conducting, current detecting unit and energy-storage units and luminescence unit form charge circuit, and operating current is gone up, and the output sensed current signal; Discharge cell and this energy-storage units and this luminescence unit formed discharge loop when diverter switch was ended, and operating current is decayed gradually.
In the control system, use control device according to this sensed current signal output control signal, in order to control this diverter switch.When current detecting unit detected operating current and decays to default low level, the conducting of control device control its switch was charged luminescence unit; When detecting operating current and go up to default high level, control device ends diverter switch, makes the luminescence unit discharge.
Specifically, a kind of switching type illuminant unit control system in order to the required operating current in stabilized illumination unit, includes: energy-storage units receives input voltage, and is connected in series with this luminescence unit, in order to this operating current to be provided; Discharge cell is connected in parallel in this energy-storage units and this luminescence unit of serial connection; Diverter switch is connected in series in this energy-storage units and this luminescence unit of serial connection; Current detecting unit is connected in series in this diverter switch and earth terminal, according to this operating current output sensed current signal; And control device, be connected in this current detecting unit and this diverter switch, according to this sensed current signal output control signal; Wherein, this control signal is controlled the switching of this diverter switch, makes this operating current stable.
According to described switching type illuminant unit control system, this energy-storage units is an inductor.
According to described switching type illuminant unit control system, this discharge cell is a diode.
According to described switching type illuminant unit control system, this discharge cell connects reverser by field-effect transistor and forms.
According to described switching type illuminant unit control system, this control device includes: pulse generator produces a pulse width signal; First control circuit is connected in this pulse generator, according to this sensed current signal, this pulse width signal and first minimum detectable signal, in order to control the output of this control signal; And second control circuit, be connected in this pulse generator and this first control circuit, according to this control signal, this sensed current signal and second minimum detectable signal, the output cycle is adjusted signal to this pulse generator, in order to adjust the cycle of this pulse width signal.
According to described switching type illuminant unit control system, this pulse generator includes: on/following counting unit, be connected in this second control circuit, adjust signal output according to this cycle and control code signal; The programmable charge current unit is connected on this/following counting unit, receives this control code signal, in order to produce charging current; Discharging current able to programme unit is connected on this/following counting unit, receives this control code signal, in order to produce discharging current; Capacitor cell is connected in this programmable charge current unit and this discharging current able to programme unit, and produces reference signal according to this charging current or this discharging current; And oscillating unit, be connected in this capacitor, this programmable charge current unit and this discharging current able to programme unit, export this pulse width signal and charging current control signal according to this reference signal.
According to described switching type illuminant unit control system, this first control circuit comprises: the overcurrent comparing unit receives this sensed current signal and this first minimum detectable signal, in order to export a reset signal; And control signal generating unit, be connected in this overcurrent comparing unit, and connect this pulse generator by reverser, with according to this reset signal and this pulse width signal, via with gate cell, export this control signal.
According to described switching type illuminant unit control system, this second control circuit includes: delay cell, be connected in this first control circuit, and receive this control signal, in order to export an inhibit signal; Comparing unit, this sensed current signal of comparison operation and this second minimum detectable signal are in order to the output current status signal; And flip-flop, be connected in this delay cell, this comparing unit and this pulse generator, extract this current state signal according to this inhibit signal, adjust signal in order to export this cycle.
According to described switching type illuminant unit control system, this luminescence unit includes light-emitting component at least.
The control device that the present invention uses is used in the luminescence unit control system, includes pulse generator in order to produce pulse width signal; The overcurrent comparing unit is used for receiving and compares the sensed current signal and first minimum detectable signal, with the output reset signal; Control signal generating unit receives this pulse width signal by reverse unit, simultaneously according to this reset signal and this pulse width signal, through exporting control signal with gate cell; Delay cell receives this control signal, with the output delay signal; Comparing unit receives and this sensed current signal of comparison operation and second minimum detectable signal, with the output current status signal; Flip-flop extracts this current state signal according to this inhibit signal, adjusts signal in order to the output cycle and arrives this pulse generator.
Specifically, a kind of switching type illuminant unit control device receives equal proportion in the sensed current signal of the operating current of luminescence unit,, includes to stablize this operating current in order to the output control signal: pulse generator produces pulse width signal; The overcurrent comparing unit receives this sensed current signal and first minimum detectable signal, in order to the output reset signal; Control signal generating unit is connected in this overcurrent comparing unit, and is connected in this pulse generator by reverse unit, according to this reset signal and this pulse width signal, via exporting this control signal with gate cell; Delay cell is connected in this and gate cell, receives this control signal, with the output delay signal; Comparing unit, this sensed current signal of comparison operation and second minimum detectable signal, output current status signal; And flip-flop, be connected in this delay cell, this comparing unit and this pulse generator, extract this current state signal according to this inhibit signal, output one-period adjustment signal is to this pulse generator, in order to adjust the cycle of this pulse width signal.
According to described switching type illuminant unit control device, this pulse generator includes: on/following counting unit, be connected in this second control circuit, adjust signal output according to this cycle and control code signal; The programmable charge current unit is connected on this/following counting unit, receives this control code signal, to produce charging current; Discharging current able to programme unit is connected on this/following counting unit, receives this control code signal, in order to produce discharging current; Capacitor cell is connected in this programmable charge current unit and this discharging current able to programme unit, and produces reference signal according to this charging current or this discharging current; And oscillating unit, be connected in this capacitor, this programmable charge current unit and this discharging current able to programme unit, export this pulse width signal and charging current control signal according to this reference signal.
The invention still further relates to a kind of switching type illuminant unit control device, be used in the luminescence unit control system, receive equal proportion, in order to export control signal to stablize this operating current in the sensed current signal of making electric current of luminescence unit, include: pulse generator produces pulse width signal; First control circuit is connected in this pulse generator, according to this sensed current signal, this pulse width signal and first minimum detectable signal, in order to control the output of this control signal; And second control circuit, be connected in this pulse generator and this first control circuit, according to this control signal, this sensed current signal and second minimum detectable signal, output one-period adjustment signal is to this pulse generator, in order to adjust the cycle of this pulse width signal.
According to described switching type illuminant unit control system, this pulse generator includes: on/following counting unit, be connected in this second control circuit, adjust signal output according to this cycle and control code signal; The programmable charge current unit is connected on this/following counting unit, receives this control code signal, in order to produce charging current; Discharging current able to programme unit is connected on this/following counting unit, receives this control code signal, in order to produce discharging current; Capacitor cell is connected in this programmable charge current unit and this discharging current able to programme unit, and produces reference signal according to this charging current or this discharging current; And oscillating unit, be connected in this capacitor, this programmable charge current unit and this discharging current able to programme unit, export this pulse width signal and charging current control signal according to this reference signal.
According to described switching type illuminant unit control system, this first control circuit comprises: the overcurrent comparing unit receives this sensed current signal and this first minimum detectable signal, in order to the output reset signal; And control signal generating unit, be connected in this overcurrent comparing unit, and connect this pulse generator by reverser, with according to this reset signal and this pulse width signal, via with gate cell, export this control signal.
According to described switching type illuminant unit control system, this second control circuit includes: delay cell, be connected in this first control circuit, and receive this control signal, in order to the output delay signal; Comparing unit, this sensed current signal of comparison operation and this second minimum detectable signal are in order to the output current status signal; Flip-flop is connected in this delay cell, this comparing unit and this pulse generator, extracts this current state signal according to this inhibit signal, adjusts signal in order to export this cycle.
Above general introduction and ensuing detailed description have been all and have further specified claim of the present invention.And about other purpose of the present invention and advantage, will in follow-up explanation and diagram, be set forth.
Description of drawings
Fig. 1 is first embodiment of known luminescence unit control circuit;
Fig. 2 is second embodiment of known luminescence unit control circuit;
Fig. 3 is the electrical block diagram of switching type illuminant unit control system of the present invention;
Fig. 4 A is the circuit diagram of first preferred embodiment of switching type illuminant unit control system of the present invention;
Fig. 4 B is the circuit diagram of second preferred embodiment of switching type illuminant unit control system of the present invention;
Fig. 5 is the circuit diagram of the preferred embodiment of the switching type illuminant unit control device of the present invention's announcement;
Fig. 6 is the preferable enforcement circuit block diagram of employed pulse generator in the control device of the present invention; And
Fig. 7 is the preferable waveform schematic diagram of the present invention.
Wherein, description of reference numerals is as follows:
Voltage source Vcc, Vs resistor R
1
Light-emitting diode 20,21...2n current source Ic
Drive current I
LED
The present invention:
Control signal generating unit 106 and gate cell 108
Flip-flop 122 comparing units 124
On the pulse generator 14/following counting unit 142
144 discharging current able to programme unit 146, programmable charge current unit
Oscillating unit 148 discharge cells 2
Energy-storage units 3 luminescence units 4
Current detecting unit 5 field-effect transistor Q
Diverter switch SW detecting element Rs
Charging current control signal S
CInput voltage V
IN
Sensed current signal V
ICapacitor Cs
Control signal V
SPulse width signal PLS
Cycle is adjusted the signal U/D first minimum detectable signal V
REF1
Reset signal S
RESETVoltage signal V
CCTime of delay T
DL
Inhibit signal V
DThe second minimum detectable signal V
REF2
Current state signal V
SDCharging current I
C
Discharging current I
DReference signal V
REF
High critical voltage V
HControl code signal N
0... N
n
Low critical voltage V
L
Embodiment
Please refer to Fig. 3, the electrical block diagram of the switching type illuminant unit control system that the present invention is preferable.With reference to figure 3, the switching type illuminant unit control system comprise control device 1, discharge cell 2, energy-storage units 3, current detecting unit 5, with diverter switch SW.
Energy-storage units 3 one terminations are received input voltage V
IN, the other end is connected to earth terminal by the luminescence unit 4 of desire control in regular turn with diverter switch SW and current detecting unit 5; Discharge cell 2 is connected in parallel in this energy-storage units 3 and luminescence unit 4 of serial connection; Control device 1 connects diverter switch SW and current detecting unit 5.
Energy-storage units 3 receives input voltage V
INElectric power provide luminescence unit 4 operation required operating current I
S Current detecting unit 5 receives operating current I when this diverter switch SW conducting
S, and the output equal proportion is in operating current I
SSensed current signal V
IControl device 1 receives this sensed current signal V
I, and according to sensed current signal V
ISize control control signal V
SOutput level, with control its switch SW conducting or end.
When control device 1 control its switch SW conducting, energy-storage units 3 is connected to earth terminal by luminescence unit 4 and diverter switch SW and current detecting unit 5, forms charge circuit.The electric power of energy-storage units 3 will make operating current I
SReach default high level; When diverter switch SW ended, energy-storage units 3 formed discharge loops, operating current I by luminescence unit 4 and discharge cell 2
SLet out energy by luminescence unit 4 and arresting element 2, and drop to default low level gradually.Above-mentioned high and low level is the default scopes of luminescence unit 4 luminosity.
Wherein luminescence unit 4 can be by more than one light-emitting component (as light-emitting diode (Light EmittingDiode; LED), white light LEDs, laser diode (Laser Diode; LD), High Power LED ... Deng) compose in series.
When switching type illuminant unit control device of the present invention and power supply unit collocation are used, can be integrated in the PWM controller, so sensed current signal V
ICan receive by the receiving terminal SENSE of PWM controller, and control signal V
SCan be by the output GATE output of PWM controller.
Fig. 4 A is the circuit diagram of first preferred embodiment of switching type illuminant unit control system of the present invention.In first preferred embodiment, diverter switch SW is realized by field-effect transistor Q; Energy-storage units 3 is to be realized by inductor L; Discharge cell 2 is to realize that by diode D 5 of current detecting units are by detecting element R
SRealize.
Wherein, the drain electrode end of transistor Q connects discharge cell 2 and luminescence unit 4; Its gate terminal connects the output GATE of control device 1; Its source terminal joint detection element R
SReceiving terminal SENSE with control device 1.When field-effect transistor Q conducting, detecting element R
SCan set up equal proportion in operating current I
SSensed current signal V
I
Fig. 4 B is the circuit diagram of second preferred embodiment of switching type illuminant unit control system of the present invention.The difference of second preferred embodiment and the first preferred embodiment circuit is the composition of discharge cell 2, and the annexation of discharge cell 2 and other unit.
In second preferred embodiment, discharge cell 2 connects reverser 20 by field-effect transistor 22 and forms.When field-effect transistor Q is controlled by control signal V
SWhen (high level) and conducting, the output of reverser 20 (low level) can make field-effect transistor 22 end.Inductor L and luminescence unit 4 are connected to earth terminal by field-effect transistor Q and detecting element Rs and form charge circuit.
In addition, be controlled by control signal V as field-effect transistor Q
S(low level) and by the time, the output of reverser 20 (high level) will make this field-effect transistor 22 conductings, and form discharge loops with inductor L and luminescence unit 4.
Please cooperate Fig. 3 with reference to figure 5, the circuit diagram of the preferred embodiment of the switching type illuminant unit control device that the present invention discloses.Control device 1 includes pulse generator 14, and pulse generator 14 is in order to periodic generation pulse width signal PLS; First control circuit 10 is connected in this pulse generator 14, according to pulse width signal PLS and sensed current signal V
IWith the first minimum detectable signal V
REF1Comparative result, in order to output control signal V
S Second control circuit 12 is connected in this pulse generator 14 and first control circuit 10, and second control circuit 12 is according to control signal V
SAnd sensed current signal V
IWith the second minimum detectable signal V
REF2Comparative result, output one-period is adjusted signal U/D.Cycle is adjusted the cycle of signal U/D in order to this pulse width signal of periodic adjustment PLS.
The output Q that is connected reverse unit 102 and control signal generating unit 106 with gate cell 108 is in order to receive the reverse pulse width signal PLS and the output of control signal generating unit 106, to control this control signal V
SWherein receive pulse width signal PLS in order to control control signal V by reverse unit 102 with gate cell 108
SMaximal duty cycle.
This second control circuit 12 uses delay cell 120 to be connected in this first control circuit 10, to receive this control signal V
S, and in T time of delay
DLBack output delay signal V
DComparing unit 124 receives and this sensed current signal of comparison operation V
IWith this second minimum detectable signal V
REF2, and in sensed current signal V
IRise to the second minimum detectable signal V
REF2The time, output current status signal V
SDAnd a flip-flop 122 is connected in this delay cell 120, this comparing unit 124 and this pulse generator 14.The frequency end CK receive delay signal V of flip-flop 122
DAfter, store the current state signal V that receives from input D simultaneously
SD, adjust signal U/D and export this cycle in output Q.
Wherein, time of delay T
DLCan be used for avoiding control signal V
SJudge (known technology that operates to of delay cell 120 does not repeat them here) by accident because of noise jamming during generation; And the brightness of luminescence unit 4 can be by setting the first minimum detectable signal V
REF1, the second minimum detectable signal V
REF2And the time of delay of delay cell 120 adjust.By designing the first minimum detectable signal V
REF1With the second minimum detectable signal V
REF2Influence the switching of diverter switch, can set operating current I
SLevel range, and then control luminescence unit 4 brightness range.
Cooperate Fig. 5, please refer to the circuit block diagram of the preferred embodiment of pulse generator in Fig. 6 control device of the present invention.Pulse generator 14 uses/following counting unit 142 these second control circuits 12 of connection, and pulse generator 14 is adjusted signal U/D according to this cycle, output control code signal N
0... N
nProgrammable charge current unit 144 is connected on this/following counting unit 142, in order to receive this control code signal N
0... N
n, and control charging current I according to this
CSize; Discharging current able to programme unit 146 is connected on this/following counting unit 142, receives this control code signal N
0... N
n, and control discharging current I according to this
DSize.
Capacitor Cs connects this programmable charge current unit 144 and this discharging current able to programme unit 146, in order to receive this charging current I
COr according to this discharging current I
DDischarge, so that reference signal V to be provided
REF Oscillating unit 148 be connected in this capacitor Cs, programmable charge current unit 144, with discharging current able to programme unit 146, according to this reference signal V
REF, export this pulse width signal PLS and charging current control signal S
C, in order to control charging current I
CWith discharging current I
DWhether export.Wherein the composition mode of oscillating unit 148 is that known technology repeats no more.
The reference signal V that receives when oscillating unit 148
REFBe lower than critical voltage V
L, and cycle when adjusting signal U/D and being high potential, on/following counting unit 142 on the number computings, control code signal N
0... N
nControl programmable charge current unit 144 (is charging current I with the magnitude of current of these discharging current able to programme unit 146 outputs
CWith discharging current I
D) increase, charging current control signal S at this moment
CProduce (high level) the 144 switch inside conductings of charging current unit, charging current I
CTo capacitor Cs charging, reference signal V
REFBecome gradually big (slope increase), thus the cycle of pulse width signal PLS minimizing (time of low level state increases), so control signal V
SThe time of high level state increases, and diverter switch SW ON time increases relatively, sets up and the steady operation electric current I
S
In addition, the reference signal V that receives when oscillating unit 148
REFBe higher than a high critical voltage V
HBut when cycle adjustment signal U/D is electronegative potential, on/142 times number computings of following counting unit, programmable charge current unit 144 reduces with the magnitude of current of discharging current able to programme unit 146 outputs, pulse width signal PLS produces (high level) and makes the 146 switch inside conductings of discharging current unit, and capacitor Cs will be according to discharging current I
DDischarge, so reference signal V
REFSlope diminish, cycle of pulse width signal PLS is strengthened (time of high level state increases), so control signal V
SThe time of low level state increases, and diverter switch SW ON time reduces relatively, operating current I
SFlow will reduce relatively because of the effect of discharge cell 2.
Therefore control cycle is adjusted the cycle of signal U/D with adjustable whole pulse generator 14 output pulse width signal PLS, makes control signal V
SThe time that is output as high level (diverter switch SW conducting) can be limited in sensed current signal V
IAt the first minimum detectable signal V
REF1With the second minimum detectable signal V
REF2Between.Flow through the operating current I of luminescence unit 4
SAlso can be, and reach stable because of the switching of diverter switch SW, to improve the luminous stability of luminescence unit 4.
Cooperate Fig. 3 and Fig. 5, please refer to Fig. 7 waveform schematic diagram of the present invention.When pulse width signal PLS reduces to low level (pulse generation unit 14 is started working, oppositely the pulse width signal PLS of unit 102 output high level) by high level, and geometric ratio is in operating current I
SSensed current signal V
IDo not rise to the first minimum detectable signal V
REF1, the control signal V of control unit 10 outputs
SBe high level signal, diverter switch SW conducting, operating current I
SThe electric power that can store according to energy-storage units 3 and the pressure drop of luminescence unit 4 and set up.
As sensed current signal V
IGreater than the first minimum detectable signal V
REF1The time, control signal V
SBe cut-off state (low level) that diverter switch SW ends, discharge cell 2 discharges operating current I by 4 pairs of energy-storage units 3 of luminescence unit
SDecline gradually.The so periodic control signal V that produces
S
As control signal V
SDuring conducting (high level), delay cell 120 begins counting (inhibit signal V
DGo to high level by low level), and through one section time of delay T
DLProduce inhibit signal V
D(going to low level by high level) makes control flip-flop 122 obtain this sensed current signal V
IWith this second minimum detectable signal V
REF2Result relatively adjusts the output of signal U/D and adjust this cycle of output, and then controls luminescence unit 4 and carry out charge or discharge.
In sum, switching type illuminant unit control system of the present invention and control device can be used for lowering the power that luminescence unit is consumed when luminous, and improve its luminous stability, can increase the useful life of luminescence unit simultaneously.
Yet, the above, only be the detailed description and the accompanying drawing of the specific embodiment of the best of the present invention, but feature of the present invention is not limited thereto, be not in order to restriction the present invention, all scopes of the present invention should be as the criterion with the scope of claim, all embodiment that accords with the spirit variation similar of claim of the present invention with it, all should be contained in the category of the present invention, any those skilled in the art in the field of the invention, can think easily and variation or modify the scope all can be encompassed in following claim of the present invention.
Claims (8)
1. a switching type illuminant unit control system in order to the required operating current in stabilized illumination unit, is characterized in that, includes:
Energy-storage units receives input voltage, and is connected in series with this luminescence unit, in order to this operating current to be provided;
Discharge cell is connected in parallel in this energy-storage units and this luminescence unit of serial connection;
Diverter switch is connected in series in this energy-storage units of serial connection and an end of this luminescence unit;
Current detecting unit is connected in series between this diverter switch and the earth terminal, according to this operating current output sensed current signal; And
Control device is connected between this current detecting unit and this diverter switch, according to this sensed current signal output control signal; Wherein, this control device includes:
Pulse generator produces pulse width signal;
The overcurrent comparing unit receives first minimum detectable signal of this sensed current signal and setting, this sensed current signal of comparison operation and this first minimum detectable signal, and according to comparative result output reset signal;
Control signal generating unit is connected in this overcurrent comparing unit, and is connected in this pulse generator by reverse unit, according to this reset signal and this pulse width signal, via exporting this control signal with gate cell;
Delay cell is connected in this and gate cell, receives this control signal, with the output delay signal;
Comparing unit, second minimum detectable signal of this sensed current signal of comparison operation and setting, and according to comparative result output current status signal; And
Flip-flop is connected in this delay cell, this comparing unit and this pulse generator, extracts this current state signal according to this inhibit signal, and output one-period adjustment signal is to this pulse generator, in order to adjust the cycle of this pulse width signal;
Wherein, this control signal is controlled the switching of this diverter switch, makes this operating current stable.
2. switching type illuminant unit control system according to claim 1 is characterized in that, this energy-storage units is an inductor.
3. switching type illuminant unit control system according to claim 1 is characterized in that, this discharge cell is a diode.
4. switching type illuminant unit control system according to claim 1 is characterized in that, this discharge cell connects reverser by field-effect transistor and forms.
5. switching type illuminant unit control system according to claim 1 is characterized in that, this pulse generator includes:
On/following counting unit, be connected in this flip-flop, adjust signal output according to this cycle and control code signal;
The programmable charge current unit is connected on this/following counting unit, receives this control code signal, in order to produce charging current;
Discharging current able to programme unit is connected on this/following counting unit, receives this control code signal, in order to produce discharging current;
Capacitor is connected in this programmable charge current unit and this discharging current able to programme unit, and produces reference signal according to this charging current or this discharging current; And
Oscillating unit is connected in this capacitor, this programmable charge current unit and this discharging current able to programme unit, exports this pulse width signal and charging current control signal according to this reference signal.
6. switching type illuminant unit control system according to claim 1 is characterized in that this luminescence unit includes light-emitting component at least.
7. a switching type illuminant unit control device is used in the luminescence unit control system, receives equal proportion in the sensed current signal of the operating current of luminescence unit,, it is characterized in that to stablize this operating current in order to the output control signal, includes:
Pulse generator produces pulse width signal;
The overcurrent comparing unit receives this sensed current signal and first minimum detectable signal, this sensed current signal of comparison operation and this first minimum detectable signal, and according to comparative result output reset signal;
Control signal generating unit is connected in this overcurrent comparing unit, and is connected in this pulse generator by reverse unit, according to this reset signal and this pulse width signal, via exporting this control signal with gate cell;
Delay cell is connected in this and gate cell, receives this control signal, with the output delay signal;
Comparing unit, this sensed current signal of comparison operation and second minimum detectable signal, and according to comparative result output current status signal; And
Flip-flop is connected in this delay cell, this comparing unit and this pulse generator, extracts this current state signal according to this inhibit signal, and output one-period adjustment signal is to this pulse generator, in order to adjust the cycle of this pulse width signal.
8. switching type illuminant unit control device according to claim 7 is characterized in that, this pulse generator includes:
On/following counting unit, be connected in this flip-flop, adjust signal output according to this cycle and control code signal;
The programmable charge current unit is connected on this/following counting unit, receives this control code signal, in order to produce charging current;
Discharging current able to programme unit is connected on this/following counting unit, receives this control code signal, in order to produce discharging current;
Capacitor is connected in this programmable charge current unit and this discharging current able to programme unit, and produces reference signal according to this charging current or this discharging current; And
Oscillating unit is connected in this capacitor, this programmable charge current unit and this discharging current able to programme unit, exports this pulse width signal and charging current control signal according to this reference signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2005101201723A CN1964587B (en) | 2005-11-11 | 2005-11-11 | A control system and device for switching type illuminant unit |
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| CN2005101201723A CN1964587B (en) | 2005-11-11 | 2005-11-11 | A control system and device for switching type illuminant unit |
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| CN1964587A CN1964587A (en) | 2007-05-16 |
| CN1964587B true CN1964587B (en) | 2011-03-16 |
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| CN101860202A (en) * | 2010-05-12 | 2010-10-13 | 海洋王照明科技股份有限公司 | Buck chopper circuit, LED drive circuit and LED lamp |
| TWI465148B (en) | 2011-03-17 | 2014-12-11 | Green Solution Tech Co Ltd | Led driving circuit and led driving controller |
| CN107631740A (en) * | 2017-09-11 | 2018-01-26 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of encoder opto-electronic compensation circuit, method and photoelectric encoder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2005009086A1 (en) * | 2003-07-16 | 2005-01-27 | Koninklijke Philips Electronics N.V. | Method and device for supplying power to leds |
| WO2005096679A1 (en) * | 2004-03-31 | 2005-10-13 | Koninklijke Philips Electronics N.V. | Circuit arrangement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2005009086A1 (en) * | 2003-07-16 | 2005-01-27 | Koninklijke Philips Electronics N.V. | Method and device for supplying power to leds |
| WO2005096679A1 (en) * | 2004-03-31 | 2005-10-13 | Koninklijke Philips Electronics N.V. | Circuit arrangement |
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