CN2852595Y - Switchable lighting unit control device and controller - Google Patents

Abstract

The utility model relates to a switching type light emitting unit control device and a controller. The control system comprises an energy storage unit, which receives an input voltage and is connected in series with a light emitting unit to be controlled; a discharge unit is connected in parallel to the series-connected energy storage unit and the light emitting unit; a switching switch is connected in series to the series-connected energy storage unit and the light emitting unit; a current detection unit is connected in series to the switching switch, and when the switching switch is turned on, outputs a detection current signal according to the working current of the light emitting unit; a controller is connected to the current detection unit and the switching switch, and outputs a control signal to control the switching switch according to the detection current signal, so that the light emitting unit can adjust the brightness in time.

Description

Switchable lighting unit control device and controller

technical field

The utility model relates to a switchable light-emitting unit control device and a controller, in particular to a device and a controller for controlling light-emitting units to emit light.

Background technique

The luminous effect of light-emitting elements, such as light-emitting diodes (LEDs), is determined by the magnitude of the current flowing through the light-emitting elements. High currents flowing through the light-emitting elements will obtain high-brightness luminous effects. On the contrary, if the current flowing through the light-emitting elements is reduced current, the brightness of the light-emitting element will be relatively weakened. But continuously supplying high current reduces the lifetime of the light-emitting element and wastes a lot of power.

FIG. 1 is a first embodiment of a known light emitting unit control circuit. The luminous effect of the light-emitting unit (composed of light-emitting elements D1, D2...Dn) in the first embodiment can be controlled by adjusting the magnitude of the output driving current I _LED through the cooperation of the voltage source Vcc and the resistor _R1 . The driving current I _LED is the current flowing through the light-emitting elements D1, D2...Dn, and the driving current I _LED can be obtained from the following formula (1):

${\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; led</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; CC</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; D.</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; D.</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="Dn\; R"\; filenames="Y20052012235900201.png,Y20052012235900202.png"\; state="\{\{state\}\}">Dn</figure-callout></span><figure-callout\; id="1"\; label="Dn\; R"\; filenames="Y20052012235900201.png,Y20052012235900202.png"\; state="\{\{state\}\}">\; </figure-callout>}}}{{\mathrm{<span\; class="notranslate">\; </span>}}_{}}<span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Where V _D1 , V _{D2 .} . . V _Dn are the voltage drops of the light emitting elements D1 , D2 . . . Dn respectively; R ₁ is the resistance value of the resistor R ₁ .

In the first embodiment, the main disadvantage is that the voltage drop of the light-emitting elements D1, D2...Dn will be affected by the characteristics of the elements, such as the manufacturing process, and the operating temperature, etc., which will affect the driving current _ILED ; while the resistance tor _R1 will cause a power loss in the circuit.

The second figure is the second embodiment of the conventional light emitting unit control circuit. In the second embodiment, the voltage source V _S is used to provide fixed power for the light emitting elements D1 , D2 . . . Dn. The luminous effect of the light emitting elements D1, D2...Dn can be adjusted by the current source Ic. However, in this control mode, since the voltage source V _S is high voltage, the voltage drops of the light emitting elements D1, D2 .

Contents of the invention

In view of this, the utility model provides a switchable light-emitting unit control device and controller, which uses the working current flowing through the light-emitting unit as feedback control to control the light-emitting unit to periodically charge and discharge, and stabilize the working current of the light-emitting unit to increase The service life of the lighting unit.

The utility model relates to a switchable light-emitting unit control device, which comprises an energy storage unit, a discharge unit, a switch, a current detection unit and a controller. It receives the input voltage through the energy storage unit, and provides the working current required for the operation of the light-emitting units connected in series: when the switch is turned on, the current detection unit forms a charging circuit with the energy storage unit and the light-emitting unit, so that the working current rises and outputs the detection current signal; when the switch is turned off, the discharge unit forms a discharge circuit with the energy storage unit and the light emitting unit, and the working current gradually decays.

In the control system, a controller is used to output a control signal according to the detected current signal to control the switching switch. When the current detection unit detects that the working current has decayed to a preset low level, the controller controls the switch to conduct to charge the light-emitting unit; when it detects that the working current rises to a preset high level, the controller makes the switch cut off, the light-emitting unit is discharged.

Specifically, a switchable light-emitting unit control device controls the working current required by the light-emitting unit, including: an energy storage unit connected in series to the light-emitting unit, and the energy storage unit receives an input voltage to generate the working current; A unit, connected in parallel with the energy storage unit and the light-emitting unit connected in series; a current detection unit, connected in series with the switch and the ground terminal, the current detection unit receives the operating current, and outputs a detection current signal; and a controller, connected Between the current detection unit and the switching switch, the controller receives the detection current signal and outputs a control signal; and a switching switch is connected in series with the light emitting unit, and the switching switch is switched on or off according to the control signal.

According to the switchable lighting unit control device, the energy storage unit is an inductor.

According to the switchable light-emitting unit control device, the discharge unit is a diode.

According to the switchable light-emitting unit control device, the discharge unit includes a field effect transistor connected to an inverter.

According to the switchable light-emitting unit control device, the controller includes: a pulse generator generating a pulse width signal; a first control circuit connected to the pulse generator, the first control circuit inputs the detection current signal, the pulse wide signal and the first critical signal, and output the control signal; and a second control circuit, connected to the pulse generator and the first control circuit, the second control circuit receives the control signal, the detection current signal and the second critical signal, and output cycle adjustment signal to the pulse generator.

According to the switchable lighting unit control device, the pulse generator includes: an up/down counting unit connected to the second control circuit, the up/down counting unit receives the cycle adjustment signal, and outputs a control code signal; The programmable charging current unit is connected to the up/down counting unit, and the programmable charging current unit receives the control code signal and generates a charging current; the programmable discharging current unit is connected to the up/down counting unit, and the programmable charging current unit is connected to the up/down counting unit. The discharge current unit receives the control code signal and generates a discharge current; the capacitor unit is connected to the programmable charge current unit and the programmable discharge current unit, and the capacitor unit receives the charge current or the discharge current and generates a reference signal; and an oscillating unit connected to the capacitor, the programmable charging current unit and the programmable discharging current unit, the oscillating unit receives the reference signal, and outputs the pulse width signal and the charging current control signal.

According to the switchable light-emitting unit control device, the first control circuit includes: an overcurrent comparison unit, which receives the detected current signal and the first critical signal, and outputs a reset signal; and a control signal generation unit, which is connected to the overcurrent The current comparison unit is connected to the pulse generator through an inverter, the control signal generation unit receives the reset signal and the pulse width signal, and outputs the control signal through the AND gate unit.

According to the switchable lighting unit control device, the second control circuit includes: a delay unit connected to the first control circuit, the delay unit receives the control signal, and outputs a delay signal; a comparison unit compares the detection current signal and the second critical signal, and generate a current state signal; and a flip-flop connected to the delay unit, the comparison unit, and the pulse generator, the flip-flop receives the delay signal, and extracts the current state signal , and output the period adjustment signal.

According to the switchable light-emitting unit control device, the light-emitting unit includes at least light-emitting elements.

The controller used in the utility model includes a pulse generator to generate a pulse width signal; the overcurrent comparison unit is used to receive and compare the detection current signal and the first critical signal to output a reset signal; the control signal generation unit passes an inverse Receive the pulse width signal to the unit, and output the control signal through the AND gate unit according to the reset signal and the pulse width signal at the same time; the delay unit receives the control signal to output a delay signal; the comparison unit receives and compares the detection The current signal and the second critical signal are used to output a current state signal; the flip-flop extracts the current state signal according to the delay signal to output a period adjustment signal to the pulse generator.

Specifically, a switchable light-emitting unit control device inputs a detection current signal that is proportional to the working current of the light-emitting unit, and outputs a control signal, including: a pulse generator that generates a pulse width signal; an overcurrent comparison unit that receives The detection current signal and the first critical signal, and the output reset signal; the control signal generation unit is connected to the overcurrent comparison unit, and is connected to the pulse generator through the reverse unit, and the control signal generation unit receives the reset signal and the pulse width signal, and output the control signal through the AND gate unit; the delay unit is connected to the AND gate unit, the delay unit receives the control signal, and outputs a delay signal; the comparison unit compares the detection current signal with the first Two critical signals, and generate a current state signal; and a flip-flop connected to the delay unit, the comparison unit and the pulse generator, the flip-flop receives the delay signal, extracts the current state signal, and adjusts the output cycle signal to the pulse generator.

According to the switchable lighting unit control device, the pulse generator includes: an up/down counting unit connected to the second control circuit, the up/down counting unit receives the cycle adjustment signal, and outputs a control code signal; The programmable charging current unit is connected to the up/down counting unit, and the programmable charging current unit receives the control code signal and generates a charging current; the programmable discharging current unit is connected to the up/down counting unit, and the programmable charging current unit is connected to the up/down counting unit. The discharge current unit receives the control code signal and generates a discharge current; the capacitor unit is connected to the programmable charge current unit and the programmable discharge current unit, and the capacitor unit receives the charge current or the discharge current and generates a reference signal; and an oscillating unit connected to the capacitor unit, the programmable charging current unit and the programmable discharging current unit, the oscillating unit receives the reference signal, and outputs the pulse width signal and the charging current control signal.

The present invention also includes a switchable light-emitting unit control device, which receives a detection current signal that is proportional to the working current of the light-emitting unit, and outputs a control signal, including: a pulse generator for generating a pulse width signal; a first control circuit connected to In the pulse generator, the first control circuit receives the detection current signal, the pulse width signal and the first critical signal, and outputs the control signal; and a second control circuit is connected to the pulse generator and the first control circuit , the second control circuit receives the control signal, the detected current signal and the second critical signal, and outputs a cycle adjustment signal to the pulse generator.

According to the switchable lighting unit control device, the pulse generator includes: an up/down counting unit connected to the second control circuit, the up/down counting unit receives the cycle adjustment signal, and outputs a control code signal; The programmable charging current unit is connected to the up/down counting unit, and the programmable charging current unit receives the control code signal and generates a charging current; the programmable discharging current unit is connected to the up/down counting unit, and the programmable charging current unit is connected to the up/down counting unit. The discharge current unit receives the control coding signal and generates a discharge current; the capacitor unit is connected to the programmable charge current unit and the programmable discharge current unit, and the capacitor unit receives the charge current or the discharge current and generates a reference signal; and an oscillating unit connected to the capacitor unit, the programmable charging current unit, and the programmable discharging current unit, the oscillating unit receives the reference signal, and outputs the pulse width signal and the charging current control signal.

According to the switchable light-emitting unit control device, the first control circuit includes: an overcurrent comparison unit, which receives the detected current signal and the first critical signal, and outputs a reset signal; and a control signal generation unit, which is connected to the overcurrent The current comparison unit is connected to the pulse generator through an inverter, the control signal generation unit receives the reset signal and the pulse width signal, and outputs the control signal through the AND gate unit.

According to the switchable lighting unit control device, the second control circuit includes: a delay unit connected to the first control circuit, the delay unit receives the control signal, and outputs a delay signal; a comparison unit compares the detection current signal and the second critical signal, and generate a current state signal; and a flip-flop connected to the delay unit, the comparison unit and the pulse generator, the flip-flop receives the delay signal, and extracts the current state signal, and This cycle adjustment signal is output.

The above overview and the following detailed description are all for further illustrating the patent scope of the present utility model. Other purposes and advantages of the present utility model will be described in the subsequent description and accompanying drawings.

Description of drawings

FIG. 1 is a first embodiment of a known light emitting unit control circuit;

Fig. 2 is a second embodiment of a known light emitting unit control circuit;

Fig. 3 is a schematic diagram of the circuit structure of the switchable light-emitting unit control device of the present invention;

Fig. 4A is a schematic circuit diagram of the first preferred embodiment of the control device of the switchable light-emitting unit of the present invention;

Fig. 4B is a circuit schematic diagram of the second preferred embodiment of the control device of the switchable light-emitting unit of the present invention;

Fig. 5 is a schematic circuit diagram of a preferred embodiment of the switchable light-emitting unit control device disclosed in the present invention;

Fig. 6 is the preferred implementation circuit block diagram of the pulse generator used in the control device of the present invention; and

Fig. 7 is a schematic diagram of a preferred waveform of the present invention.

Wherein, the reference signs are explained as follows:

current technology:

Voltage source Vcc, Vs Resistor R ₁

Light-emitting diodes 20, 21...2n Current source Ic

Driving current _ILED

The utility model:

Controller 1 The first control circuit 1

Reverse unit 102 Overcurrent comparison unit 104

Control signal generation unit 106 AND gate unit 108

Second control circuit 12 Delay unit 120

flip-flop 122 comparison unit 124

Pulse generator 14 Up/down counting unit 142

Programmable charge current unit 144 Programmable discharge current unit 146

Oscillating unit 148 Discharging unit 2

Inverter 20 Field Effect Transistor 22

Energy storage unit 3 Lighting unit 4

Current detection unit 5 field effect transistor Q

Switch SW Detection element Rs

Charging current control signal S _C input voltage V _IN

Detection current signal V _I Capacitor Cs

Control signal V _S Pulse width signal PLS

Period adjustment signal U/D First critical signal V _REF1

Reset signal S _RESET voltage signal V _CC delay time T _DL

Delay signal V _D second critical signal V _REF2

Current Status Signal V _SD Charging Current I _C

Discharge current I _D Reference signal V _REF

High threshold voltage V _H controls coded signals N ₀ ... N _n

Low Threshold Voltage V _L

Detailed ways

Please refer to FIG. 3 , which is a schematic diagram of a circuit structure of a preferred switchable light-emitting unit control device of the present invention. Referring to FIG. 3 , the switchable lighting unit control device includes a controller 1 , a discharge unit 2 , an energy storage unit 3 , a current detection unit 5 , and a switch SW.

The terminal of the energy storage unit 3 receives the input voltage V _IN , and the other terminal is connected in series to a ground terminal through the light-emitting unit 4 to be controlled, the switch SW and the current detection unit 5 in sequence; the discharge unit 2 is connected in parallel to the energy storage unit connected in series. The unit 3 and the light emitting unit 4 ; the controller 1 is connected with the switching switch SW and the current detection unit 5 .

The energy storage unit 3 receives the power of the input voltage V _IN to provide the operating current I _S required for the operation of the light emitting unit 4; the current detection unit 5 receives the operating current I _S when the switch SW is turned on, and outputs an output equal to the operating current The detection current signal V _I of _IS ; the controller 1 receives the detection current signal V _I , and controls the output level of a control signal V _S according to the magnitude of the detection current signal V _I to control the switching switch SW to be turned on or off.

When the controller 1 controls the switching switch SW to be turned on, the energy storage unit 3 is connected to the ground terminal through the light emitting unit 4 , the switching switch SW and the current detection unit 5 to form a charging circuit. The power of the energy storage unit 3 will make the operating current _IS reach a preset high level; when the switch SW is turned off, the energy storage unit 3 forms a discharge circuit with the discharge unit 2 through the light emitting unit 4, and the operating current _IS passes through the light emitting unit 4 and the discharge element 2 perform energy discharge, and gradually drop to a preset low level. The above-mentioned high and low levels are preset ranges of the light emitting brightness of the light emitting unit 4 .

The light-emitting unit 4 can be composed of more than one light-emitting element (such as a light-emitting diode (Light Emitting Diode; LED), a white light LED, a laser diode (Laser Diode; LD), a high-power light-emitting diode, etc.) connected in series.

When the switchable light-emitting unit control device of the present invention is used in conjunction with a power supply, it can be integrated into the PWM controller, so the detection current signal V _I can be received by the receiving end SENSE of the PWM controller, and the control signal V _S can be received by The output terminal of the PWM controller is GATE output.

FIG. 4A is a schematic circuit diagram of a first preferred embodiment of the switchable lighting unit control device of the present invention. In the first preferred embodiment, the switching switch SW is implemented by a field effect transistor Q; the energy storage unit 3 is implemented by an inductor L; the discharge unit 2 is implemented by a diode D, and the current detection unit 5 is implemented by a detection element R _S realized.

Wherein, the drain terminal of the transistor Q is connected to the discharge unit 2 and the light emitting unit 4 ; its gate terminal is connected to the output terminal GATE of the controller 1 ; its source terminal is connected to the detection element _RS and the receiving terminal SENSE of the controller 1 . When the field effect transistor Q is turned on, the detection element R _S can establish a detection current signal V _I that is proportional to the operating current _IS .

FIG. 4B is a schematic circuit diagram of a second preferred embodiment of the switchable lighting unit control device of the present invention. The difference between the circuit of the second preferred embodiment and the circuit of the first preferred embodiment lies in the composition of the discharge unit 2 and the connection relationship between the discharge unit 2 and other units.

In the second preferred embodiment, the discharge unit 2 is composed of a field effect transistor 22 connected to an inverter 20 . When the field effect transistor Q is turned on by the control signal V _S (high level), the output of the inverter 20 (low level) can turn off the field effect transistor 22 . The inductor L and the light emitting unit 4 are connected to the ground terminal through the field effect transistor Q and the detection element _RS to form a charging loop.

In addition, when the field effect transistor Q is turned off by the control signal V _S (low level), the output of the inverter 20 (high level) will turn on the field effect transistor 22, and the inductor L and the light emitting diode Unit 4 forms a discharge circuit.

Please refer to FIG. 5 in conjunction with FIG. 3 , which is a schematic circuit diagram of a preferred embodiment of the switchable light-emitting unit control device disclosed in the present invention. The controller 1 includes a pulse generator 14, and the pulse generator 14 is used to periodically generate a pulse width signal PLS; the first control circuit 10 is connected to the pulse generator 14, and according to the pulse width signal PLS and the detection current signal V _I and The comparison result of the first critical signal V _REF1 is used to output the control signal V _S ; the second control circuit 12 is connected to the pulse generator 14 and the first control circuit 10, and the second control circuit 12 is based on the control signal V _S and the detection current The period adjustment signal U/D is output from the comparison result of the signal V _I and the second critical signal V _REF2 . The period adjustment signal U/D is used to periodically adjust the period of the pulse width signal PLS.

The first control circuit 10 has an overcurrent comparison unit 104 for receiving and comparing the detected current signal V _I with the first critical signal V _REF1 , and when the detected current signal V _I rises to the first critical signal V _REF1 , A reset signal S _RESET (low level) is output; the control signal generation unit 106 is connected to the overcurrent comparison unit 104 and connected to the pulse generator 1 through the inversion unit 102 . The output of the output terminal Q of the control signal generation unit 106 is based on the voltage signal V _CC received by the input terminal D, and the frequency terminal CK receives the inverted pulse width signal PLS through the inverting unit 102 to output accordingly, and at the reset terminal R This output is adjusted when the reset signal S _RESET (low level) is received.

The AND gate unit 108 is connected to the output terminal Q of the inverting unit 102 and the control signal generating unit 106 to receive the inverted pulse width signal PLS and the output of the control signal generating unit 106 to control the control signal V _S . The AND gate unit 108 receives the pulse width signal PLS through the inverting unit 102 to control the maximum duty cycle of the control signal V _S .

The second control circuit 12 is connected to the first control circuit 10 using a delay unit 120 to receive the control signal V _S and output a delay signal V _D after a delay time T _DL ; the comparison unit 124 receives and compares the detection current signal V _I and the second critical signal V _REF2 , and when the detection current signal V _I rises to the second critical signal V _REF2 , output the current state signal V _SD ; and the flip-flop 122 is connected to the delay unit 120, the comparison unit 124 and the pulse generator 14 . After the frequency terminal CK of the flip-flop 122 receives the delay signal V _D , it simultaneously stores the current state signal V _SD received from the input terminal D, and outputs the period adjustment signal U/D at the output terminal Q.

Wherein, the delay time T _DL can be used to avoid errors due to noise interference when the control signal V _S is generated (the operation of the delay unit 120 is a known technology and will not be described in detail here); and the brightness of the light-emitting unit 4 can be set by the first critical signal V _REF1 , the second threshold signal V _REF2 and the delay time of the delay unit 120 are adjusted. By designing the first critical signal V _REF1 and the second critical signal V _REF2 to affect the switching of the switch, the level range of the operating current _IS can be set, thereby controlling the brightness range of the light emitting unit 4 .

In conjunction with FIG. 5 , please refer to FIG. 6 , which is a circuit block diagram of a preferred embodiment of the pulse generator in the control device of the present invention. The pulse generator 14 uses an up/down counting unit 142 to connect to the second control circuit 12, the pulse generator 14 adjusts the signal U/D according to the period, and outputs the control coding signal N ₀ ... N _n ; the programmable charging current unit 144 is connected to the up/down counting unit 142 to receive the control code signal N ₀ ... N _n and to control the magnitude of the charging current _IC accordingly; the programmable discharge current unit 146 is connected to the up/down counting The unit 142 receives the control coding signals N ₀ ... N _n , and controls the magnitude of the discharge current _ID accordingly.

The capacitor Cs is connected to the programmable charging current unit 144 and the programmable discharging current unit 146 to receive the charging current _IC or discharge according to the discharging current _ID to provide a reference signal V _REF ; the oscillator unit 148 is connected to the The capacitor Cs, the programmable charging current unit 144, and the programmable discharging current unit 146 output the pulse width signal PLS and a charging current control signal S _C according to the reference signal V _REF to control the charging current I _C and the discharging current Whether _ID is output. The composition of the oscillating unit 148 is a known technology and will not be repeated here.

When the reference signal V _REF received by the oscillating unit 148 is lower than the low threshold voltage V _L and the period adjustment signal U/D is at a high potential, the up/down counting unit 142 counts up and controls the encoding signals N ₀ ... N _n controls the output current of the programmable charging current unit 144 and the programmable discharging current unit 146 (that is, the charging current I _C and the discharging current I _D ) to increase. At this time, the charging current control signal S _C is generated (high level), charging The switch inside the current unit 144 is turned on, the charging current I _C charges the capacitor Cs, and the reference signal V _REF gradually increases (increasing the slope), so the period of the pulse width signal PLS decreases (the time of the low level state increases), so the control As the time of the high level state of the signal V _S increases, the turn-on time of the switch SW increases relatively, and the working current I _S is established and stabilized.

In addition, when the reference signal V _REF received by the oscillating unit 148 is higher than a high threshold voltage V _H , but the period adjustment signal U/D is at a low potential, the up/down counting unit 142 counts down, and the programmable charging current unit 144 The output current of the programmable discharge current unit 146 decreases, and the pulse width signal PLS generates (high level) to turn on the internal switch of the discharge current unit 146, and the capacitor Cs will discharge according to the discharge current _ID , so the reference signal V The slope of _REF becomes smaller, and the cycle of the pulse width signal PLS increases (the time of the high-level state increases), so the time of the control signal V _S low-level state increases, the on-time of the switch SW decreases relatively, and the operating current _IS The flow rate will be relatively reduced due to the action of the discharge unit 2.

Therefore, the control period adjustment signal U/D can adjust the period of the pulse generator 14 outputting the pulse width signal PLS, so that the time during which the control signal V _S is output at a high level (the switching switch SW is turned on) will be limited to the detection current signal V _I Between the first critical signal V _REF1 and the second critical signal V _REF2 . The operating current I _S flowing through the light emitting unit 4 is also stabilized by switching the switch SW, so as to improve the stability of the light emitting unit 4 emitting light.

In conjunction with Fig. 3 and Fig. 5, please refer to Fig. 7 for a schematic waveform diagram of the utility model. When the pulse width signal PLS drops from a high level to a low level (pulse wave generating unit 14 starts to work, and the inversion unit 102 outputs a high level pulse width signal PLS), and is equivalent to the detection current signal of the operating current _IS V _I does not rise to the first critical signal V _REF1 , the control signal V _S output by the control unit 10 is a high-level signal, the switch SW is turned on, and the operating current I _S will be based on the power stored in the energy storage unit 3 and the light emitting unit 4 The pressure drop is established.

When the detection current signal V _I is greater than the first critical signal V _REF1 , the control signal V _S is in the cut-off state (low level), the switch SW is cut off, the discharge unit 2 discharges the energy storage unit 3 through the light-emitting unit 4, and the operating current _IS gradually decreased. The control signal V _S is periodically generated in this way.

When the control signal V _S is turned on (high level), the delay unit 120 starts counting (the delay signal V _D turns from low level to high level), and after a delay time T _DL generates a delay signal V _D (turns from high level to level to low level), so that the control flip-flop 122 obtains the result of comparing the detection current signal V _I with the second critical signal V _REF2 , and adjusts and outputs the output of the cycle adjustment signal U/D, thereby controlling the light emission Cell 4 performs charging or discharging.

To sum up, the switchable light-emitting unit control device and controller of the present invention can be used to reduce the power consumed by the light-emitting unit when emitting light, improve the stability of light-emitting, and prolong the service life of the light-emitting unit.

However, the above descriptions are only the detailed description and drawings of the best specific embodiments of the present utility model, but the features of the present utility model are not limited thereto, and are not intended to limit the utility model and the entire scope of the utility model Should be based on the scope of the claims, all the embodiments that conform to the spirit of the patent scope of the utility model and its similar changes, all should be included in the category of the utility model, any person skilled in the art in the field of the utility model Within the scope of the claims of the present utility model, easily conceivable changes or modifications can be included.

Claims (15)

1. a switching type illuminant unit control device is controlled the required operating current of luminescence unit, it is characterized in that, includes:

Energy-storage units, this luminescence unit that is connected in series, this energy-storage units receives input voltage, to produce this operating current;

Discharge cell is connected in parallel with this energy-storage units that is connected in series and this luminescence unit;

Current detecting unit, be connected in series this diverter switch and earth terminal, this current detecting unit receives this operating current, and the output sensed current signal; And

Controller is connected in this current detecting unit and this diverter switch, and this controller receives this sensed current signal, and the output control signal; And

Diverter switch, this luminescence unit that is connected in series, this diverter switch switches to conducting according to this control signal or ends.

2. switching type illuminant unit control device according to claim 1 is characterized in that, this energy-storage units is an inductor.

3. switching type illuminant unit control device according to claim 1 is characterized in that, this discharge cell is a diode.

4. switching type illuminant unit control device according to claim 1 is characterized in that, this discharge cell comprises that field-effect transistor connects reverser.

5. switching type illuminant unit control device according to claim 1 is characterized in that, this controller includes:

Pulse generator produces a pulse width signal;

Control circuit is connected in this pulse generator, and this control circuit is imported this sensed current signal, this pulse width signal and first minimum detectable signal, and exports this control signal; And

Second control circuit is connected in this pulse generator and this first control circuit, and this second control circuit receives this control signal, this sensed current signal and second minimum detectable signal, and the output cycle is adjusted signal to this pulse generator.

6. switching type illuminant unit control device according to claim 5 is characterized in that, this pulse generator includes:

On/following counting unit, be connected in this second control circuit, on this/following counting unit receives this cycle adjustment signal, and output control code signal;

The programmable charge current unit is connected on this/following counting unit, and this programmable charge current unit receives this control code signal, and produces charging current;

Discharging current able to programme unit is connected on this/following counting unit, and this discharging current able to programme unit receives this control code signal, and produces discharging current;

Capacitor cell is connected in this programmable charge current unit and this discharging current able to programme unit, and this capacitor cell receives this charging current or this discharging current, and produces reference signal; And

Oscillating unit is connected in this capacitor, this programmable charge current unit and this discharging current able to programme unit, and this oscillating unit receives this reference signal, and exports this pulse width signal and charging current control signal.

7. switching type illuminant unit control device according to claim 5 is characterized in that, this control circuit comprises:

The overcurrent comparing unit receives this sensed current signal and this first minimum detectable signal, and the output reset signal; And

Control signal generating unit is connected in this overcurrent comparing unit, and connects this pulse generator by reverser, and this control signal generating unit receives this reset signal and this pulse width signal, and via with gate cell, export this control signal.

8. switching type illuminant unit control device according to claim 5 is characterized in that, this second control circuit includes:

Delay cell is connected in this first control circuit, and this delay cell receives this control signal, and the output delay signal;

Comparing unit, relatively this sensed current signal and this second minimum detectable signal, and produce current state signal; And

Flip-flop is connected in this delay cell, this comparing unit and this pulse generator, and this flip-flop receives this inhibit signal, and extracts this current state signal, and exports this cycle and adjust signal.

9. switching type illuminant unit control device according to claim 1 is characterized in that this luminescence unit includes light-emitting component at least.

10. a switching type illuminant unit control device is imported equal proportion in the sensed current signal of the operating current of luminescence unit, and the output control signal, it is characterized in that, includes:

Pulse generator produces pulse width signal;

The overcurrent comparing unit receives this sensed current signal and first minimum detectable signal, and 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, and this control signal generating unit receives this reset signal and this pulse width signal, and via exporting this control signal with gate cell;

Delay cell is connected in this and gate cell, and this delay cell receives this control signal, and the output delay signal;

Comparing unit, relatively this sensed current signal and second minimum detectable signal, and produce current state signal; And

Flip-flop is connected in this delay cell, this comparing unit and this pulse generator, and this flip-flop receives this inhibit signal, and extracts this current state signal, and the output cycle is adjusted signal to this pulse generator.

11. switching type illuminant unit control device according to claim 10 is characterized in that, this pulse generator includes:

On/following counting unit, be connected in this second control circuit, on this/following counting unit receives this cycle adjustment signal, and output control code signal;

The programmable charge current unit is connected on this/following counting unit, and this programmable charge current unit receives this control code signal, and produces charging current;

Discharging current able to programme unit is connected on this/following counting unit, and this discharging current able to programme unit receives this control code signal, and produces discharging current;

Capacitor cell is connected in this programmable charge current unit and this discharging current able to programme unit, and this capacitor cell receives this charging current or this discharging current, and produces reference signal; And

Oscillating unit is connected in this capacitor cell, this programmable charge current unit and this discharging current able to programme unit, and this oscillating unit receives this reference signal, and exports this pulse width signal and charging current control signal.

12. a switching type illuminant unit control device receives equal proportion in the sensed current signal of the operating current of luminescence unit, and the output control signal, it is characterized in that, includes:

Pulse generator produces pulse width signal;

First control circuit is connected in this pulse generator, and this control circuit receives this sensed current signal, this pulse width signal and first minimum detectable signal, and exports this control signal; And

Second control circuit is connected in this pulse generator and this first control circuit, and this second control circuit receives this control signal, this sensed current signal and second minimum detectable signal, and the output cycle is adjusted signal to this pulse generator.

13. switching type illuminant unit control device according to claim 12 is characterized in that, this pulse generator includes:

On/following counting unit, be connected in this second control circuit, on this/following counting unit receives this cycle adjustment signal, and output control code signal;

The programmable charge current unit is connected on this/following counting unit, and this programmable charge current unit receives this control code signal, and produces charging current;

Discharging current able to programme unit is connected on this/following counting unit, and this discharging current able to programme unit receives this control code signal, and produces discharging current;

Capacitor cell is connected in this programmable charge current unit and this discharging current able to programme unit, and this capacitor cell receives this charging current or this discharging current, and produces reference signal; And

Oscillating unit, be connected in this capacitor cell, this programmable charge current unit, with this discharging current able to programme unit, this oscillating unit receives this reference signal, and exports this pulse width signal and charging current control signal.

14. switching type illuminant unit control device according to claim 12 is characterized in that, this control circuit comprises:

The overcurrent comparing unit receives this sensed current signal and this first minimum detectable signal, and the output reset signal; And

Control signal generating unit is connected in this overcurrent comparing unit, and connects this pulse generator by reverser, and this control signal generating unit receives this reset signal and this pulse width signal, and via exporting this control signal with gate cell.

15. switching type illuminant unit control device according to claim 12 is characterized in that, this second control circuit includes:

Delay cell is connected in this control circuit, and this delay cell receives this control signal, and the output delay signal;

Comparing unit, relatively this sensed current signal and this second minimum detectable signal, and produce current state signal; And

Flip-flop is connected in this delay cell, this comparing unit and this pulse generator, and this flip-flop receives this inhibit signal, and extracts this current state signal, and exports this cycle and adjust signal.

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