TWI496501B - Piecewise linear driving light source apparatus - Google Patents

Description

Fragment linearly driven light source device

A light source device is particularly related to a light source device in which a segment is linearly driven.

In general, most of the driving circuits of the light-emitting diodes convert the alternating current voltage into a direct current voltage or a current, and then use a stable direct current voltage or current to drive the light emitting diode to emit light and control the brightness of the light emitting diode.

However, in order to turn on two or more light-emitting diodes connected in series to cause the light-emitting diode to emit light, the voltage value provided by the driving circuit is greater than the sum of the two or more light-emitting diodes. After the power supply voltage is deducted from the sum of the on-state voltages of the LEDs, the excess voltage drop will cause unnecessary power consumption. Therefore, there is a need for a new light-emitting diode driving circuit that can improve the light-emitting quality of the light-emitting diode and eliminate unnecessary power consumption.

In view of the above problems, the present invention provides a light source device for linear driving of a segment, thereby reducing power consumption of the circuit and having high power and high power factor.

A segment linearly driven light source device according to the present invention includes N light emitting diode strings and driving devices. N light-emitting diodes are coupled in series, and the plurality of light-emitting diodes have a plurality of light-emitting diodes coupled in series, wherein the light-emitting diodes of the i+1th LED array are arranged The number of bodies is adjusted according to the number of light-emitting diodes in the ith LED array, and the number of light-emitting diodes is adjusted by GLED _{i +1} =( j +1) GLED _i , and GLED _{i +1} is the number of light-emitting diodes in the i+ 1th LED array , and GLED _i is the number of light-emitting diodes in the i-th LED array , and N is greater than 1. A positive integer, i is a positive integer greater than 0, j is an integer greater than or equal to 0, and 0 < i N-1. The driving device is coupled to the N light emitting diodes and provides a driving current for driving the N light emitting diodes, and the driving device detects the detecting voltage of the cathode end of the first LED array. To determine the number of conductions of the N light-emitting diodes.

In an embodiment, when j=0 between each N light-emitting diode series and the detection voltage is greater than the first reference voltage, the driving device drives the N light-emitting diode strings in an extended manner. Columns to increase the number of conductions of N light-emitting diodes.

In an embodiment, when j=0 between each N light-emitting diode series and the detection voltage is less than the second reference voltage, the driving device drives the N light-emitting diode strings in an extended manner. Columns to reduce the number of conductions of N light-emitting diodes.

In one embodiment, when j≠0 between each N light-emitting diodes and the detection voltage is greater than the first reference voltage, the driving device drives the corresponding N light-emitting diodes in a carry manner. The body string is turned on.

In one embodiment, when j≠0 between each N light-emitting diodes and the detection voltage is less than the second reference voltage, the driving device drives the corresponding N light-emitting diodes in a carry manner. The body string is turned on.

In an embodiment, when the portion between the N light-emitting diodes is j=0, the portion between the N light-emitting diodes is j≠0, and the detection voltage is greater than the first reference voltage, the driving is performed. The device drives the corresponding N light-emitting diodes in series to be connected in a driving manner with an extension and a carry.

In an embodiment, when the portion between the N light-emitting diodes is j=0, the portion between the N light-emitting diodes is j≠0, and the detection voltage is less than the second reference voltage, the driving is performed. The device drives the corresponding N light-emitting diodes in series to be connected in a driving manner with an extension and a carry.

In one embodiment, when the detection voltage is greater than the second reference voltage and less than the first reference voltage, the driving device maintains the number of conduction of the N LED series.

In an embodiment, the driving device comprises N switching units, a current source, a detecting unit and a control unit. The N switching units are coupled in parallel to the N LED arrays in a one-to-one manner. The first end of the current source is coupled to the cathode end of the first LED array, and provides a driving current to drive the N LED arrays, and the first end of the current source provides a detection voltage. The detecting unit is coupled to the first end of the current source for receiving and detecting the detection signal according to the current source, the first reference voltage and the second reference voltage to generate a detection signal. The control unit is coupled to the N switch units and the detecting unit for receiving and generating a plurality of first control signals according to the detection signals to dynamically adjust the number of conduction of the N switch units.

In an embodiment, when the detection voltage of j=0 between each N light-emitting diode series and the detection signal is a current source is greater than the first reference voltage, the control unit is controlled in an extended manner. The corresponding N switching units are turned off to reduce the number of conduction of the N switching units.

In an embodiment, when the detection voltage of j=0 between each N light-emitting diode series and the detection signal is a current source is less than the second reference voltage, the control unit is controlled in an extended manner. Corresponding N switch units are disconnected to increase N switches The number of conduction of the unit.

In an embodiment, when the detection voltage of the current source is greater than the first reference voltage, and the control unit is controlled by a carry mode, when the detection voltage between the N LED strings is greater than the first reference voltage. The corresponding N switching units are turned on.

In an embodiment, when the detection voltage of the current source is less than the second reference voltage when the detection voltage of each of the N light-emitting diodes is j≠0, the control unit controls by a carry manner. The corresponding N switching units are turned on.

In an embodiment, when the portion between the N light-emitting diodes is j=0, the portion between the N light-emitting diodes is j≠0, and the detection signal is greater than the detection voltage of the current source. When the first reference voltage is used, the control unit controls the corresponding N switching units to be turned on in a driving manner with an extension and a carry.

In one embodiment, the portion between the N light-emitting diodes is j=0, the portion between the N light-emitting diodes is j≠0, and the detection signal is a current source detection voltage is less than When the second reference voltage is used, the driving device controls the corresponding N switching units to be turned on in a driving manner with an extension and a carry.

In an embodiment, when the detection voltage of the detection signal is a current source is greater than the second reference voltage and less than the first reference voltage, the control unit maintains the conduction quantity of the N switching units.

In an embodiment, the detecting unit comprises a first comparator and a second comparator. The first input end of the first comparator receives the first reference voltage, the second input end of the first comparator receives the detection voltage of the current source, and the output end of the first comparator generates a detection signal. The first input of the second comparator receives the second reference voltage, the second comparison The second input end of the second comparator is coupled to the second input end of the first comparator, and the output end of the second comparator generates a detection signal.

In an embodiment, the aforementioned control unit includes a controller and N switch control units. The controller is coupled to the detecting unit for receiving and generating a plurality of second control signals or a plurality of third control signals according to the detection signal. The N switch control units are coupled to the N switch units one-to-one, and the N switch control units are coupled in series, and the first switch control unit is coupled to the controller for sequentially receiving and according to the second control signal or the third The signal is controlled to generate a first control signal.

In an embodiment, the aforementioned current source comprises an operational amplifier and a transistor. The first input of the operational amplifier receives the operating voltage, and the second input of the operational amplifier is coupled to the ground through a resistor. The first end of the transistor is coupled to the output of the operational amplifier, the second end of the transistor generates a detection voltage of the current source, and the third end of the transistor is coupled to the second input of the operational amplifier.

In an embodiment, the light source device of the aforementioned segment linear drive further comprises N auxiliary light emitting diode strings. The cathode end of the k-th auxiliary light-emitting diode series is coupled to the anode end of the k-th light-emitting diode series, and the anode end of the k-th auxiliary light-emitting diode series is coupled to the k+1th light-emitting diode The anode end of the pole body series, the anode end of the k+1th auxiliary light emitting diode series receives the working voltage, and the cathode end of the first auxiliary light emitting diode series is coupled to the first light emitting diode string The anode end of the column, where 0<k N-1.

In one embodiment, the N auxiliary light-emitting diode series each include M light-emitting diodes, wherein M is a positive integer greater than or equal to zero.

A fragment linearly driven light source device disclosed in the present invention, wherein each of the hair sources The light diodes are connected in parallel with one switching unit, and the driving device controls whether each switching unit is turned on or off according to the detection voltage of the current source, so that the light emitting diodes are sequentially turned on or off. Thereby, the power consumption of the circuit can be reduced, and high efficiency and high power factor can be achieved.

The features and implementations of the present invention are described in detail below with reference to the drawings.

In the embodiments which are enumerated below, the same or similar elements will be denoted by the same reference numerals.

Please refer to FIG. 1 , which is a schematic diagram of a light source device for linear driving of a segment of the present invention. The segment linearly driven light source device 100 includes N light emitting diode strings 110_1 110 110_N and a driving device 150, where N is a positive integer greater than one. The LED arrays 110_1~110_N are coupled in series. For example, the anode end of the first LED array 110_1 is coupled to the cathode end of the second LED array 110_2, ..., the N-1th LED series 110_N-1. The anode end is coupled to the cathode end of the Nth LED array 110_N.

In this embodiment, each of the LED arrays 110_1 110 110_N has a plurality of LEDs coupled in series, and the anode and cathode ends of the LEDs are coupled to each other, and the LEDs are coupled to each other. The anode end of the first light-emitting diode in the body serves as the anode end of each of the light-emitting diode strings 110_1~110_N, and the cathode end of the last light-emitting diode of these light-emitting diodes serves as each light-emitting diode The cathode ends of the series 110_1~110_N.

The number of the light emitting diodes in the i+1th LED array can be adjusted according to the number of the LEDs in the ith LED array, 0<i N-1. Further, the relationship between the number of the light-emitting diodes in the (i+1)th LED series and the number of the light-emitting diodes in the i-th LED array is generated in an iterative relationship. , can be as shown in the following formula (1): Wherein, GLED _{i +1} represents the number of light-emitting diodes in the i+ 1th LED array , and GLED _i represents the number of light-emitting diodes in the i-th LED array . Moreover, the user can adjust the size of j according to the needs thereof, so that the number of the light-emitting diodes in each of the light-emitting diode strings 110_1~110_N can be the same or different. Some examples will be given below to illustrate. Where i is a positive integer greater than 0 and j is an integer greater than or equal to zero.

Please refer to FIG. 2A, which is an example of the arrangement of the number of light-emitting diodes in the LED array of the present invention. In "2A", it is assumed that the number of light-emitting diodes in the first light-emitting diode series 110_1 is n, and j between the first to fourth light-emitting diode strings 110_1 to 110_4 The values are all set to 0 (ie, j=0), so the number of the light-emitting diodes in the second to fourth light-emitting diode series 110_2 to 110_4 is also n, where n is a positive integer greater than zero.

Please refer to FIG. 2B, which is another embodiment of the number arrangement of the light-emitting diodes of the LED array of the present invention. In "2B", it is assumed that the number of the light-emitting diodes in the first light-emitting diode series 110_1 is n, and the second light-emitting diode series 110_2 and the first light-emitting diode are Tandem 110_1 The value of j between the second LED arrays 110_2 is 2n.

Next, if the j value between the third LED array 110_3 and the second LED array 110_2 is set to 0 (ie, j=0), the third LED array 110_3 The number of light-emitting diodes in the middle is 2n. After that, if the j value between the fourth LED array 110_4 and the third LED array 110_3 is set to 0 (ie, j=0), the fourth LED array 110_4 The number of light-emitting diodes in the middle is 2n.

Please refer to FIG. 2C, which is another embodiment of the arrangement of the number of light-emitting diodes of the LED array of the present invention. In the "2Cth diagram", it is assumed that the number of the light-emitting diodes in the first light-emitting diode series 110_1 is 2n, and the second light-emitting diode series 110_2 and the first light-emitting diode are When the value of j between the strings 110_1 is set to 1 (i.e., j = 1), the number of the light-emitting diodes in the second LED array 110_2 is 4n. Next, if the j value between the third LED array 110_3 and the second LED array 110_2 is set to 0 (ie, j=0), the third LED array 110_3 The number of light-emitting diodes in the middle is 4n.

After that, if the j value between the fourth LED array 110_4 and the third LED array 110_3 is set to 2 (ie, j=2), the fourth LED array 110_4 The number of light-emitting diodes in the middle is 12n. Next, if the value of j between the fifth LED array 110_5 and the fourth LED array 110_4 is set to 0 (ie, j=0), the fifth LED array 110_5 Illuminated dipole The number of bodies is 12n.

The above description is only an implementation of the number arrangement of the light emitting diodes in the LED array. However, the present invention is not limited thereto, and the user can adjust the LEDs between the LED strings according to their needs. Values, and with reference to the foregoing description, the implementation of the number arrangement of the light-emitting diodes in the other LED series can also be derived, and thus will not be described herein.

Moreover, the light-emitting diodes in each of the light-emitting diode strings 110_1~110_N can still be divided into a plurality of groups, and the number arrangement between the light-emitting diodes of each group can still refer to the foregoing light-emitting diodes. The arrangement of the iterations described in series 110_1~110_N is performed. The light-emitting diodes of each group can be further divided into a plurality of sub-groups, and the number arrangement between the light-emitting diodes of each sub-group can still be referred to the foregoing light-emitting diode series 110_1~110_N. It is configured in an iterative manner. By analogy, the configuration of various types of light-emitting diodes can be completed, and therefore will not be described herein.

In addition, the anode terminal of the Nth LED array 110_N receives the operating voltage VIN, and the operating voltage VIN is, for example, a voltage rectified by an AC voltage through a bridge rectifier or a converted voltage of a DC voltage.

The driving device 150 is coupled to the N LED arrays 110_1~110_N for providing a driving current ILED to drive the N LED series 110_1~110_N, and the driving device 150 detects the first LED 2 The detection voltage VD of the cathode end of the pole body 110_1 determines the conduction amount of the LED series 110_1~110_N.

Further, when the driving device 150 detects that the detection voltage VD is greater than the first When the voltage is referenced, the driving device 150 increases the conduction amount of the LED series 110_1~110_N, so that a certain LED array is turned on and emits light.

When the driving device 150 detects that the detection voltage VD is less than the second reference voltage, the driving device 150 reduces the number of conduction of the LED arrays 110_1~110_N, for example, by isolating a certain LED string by bypass. The columns (eg, LED array 110_N) are such that drive current does not flow through the LED array to reduce the amount of conduction of the LED array. When the driving device 150 detects that the detection voltage VD is greater than the second reference voltage and is less than the first reference voltage, the driving device 150 maintains the conduction quantity of the LED arrays 110_1 110 110_N, for example.

In this way, the present embodiment can sequentially increase or decrease the number of conduction of the LED series by detecting the magnitude of the detection voltage VD, thereby eliminating unnecessary power consumption.

Please refer to FIG. 3, which is a detailed schematic diagram of a linear drive light source device of the present invention. The driving device 150 includes N switching units 310_1~310_N, a current source 320, a detecting unit 330, and a control unit 340.

The switch units 310_1~310_N are coupled in parallel with the LED arrays 110_1~110_N in a one-to-one manner. For example, the first switching unit 310_1 is coupled in parallel with the first LED array 110_1, and the second switching unit 310_2 is coupled in parallel with the second LED string 110_2, ..., Nth The switching unit 310_N is coupled in parallel with the Nth LED array 110_N.

The current source 320 is coupled to the cathode end of the first LED array 110_1 for providing a driving current ILED to drive the LED arrays 110_1 110 110_N. Detection The unit 330 is coupled to the current source 320 for receiving the detection voltage VD of the current source 320 (ie, the detection voltage of the current source 320 coupled to the cathode end of the first LED array 110_1), the first reference. The voltage VREF1 and the second reference voltage VREF2 are generated according to the detection voltage VD, the first reference voltage VREF1 and the second reference voltage VREF2 to generate a detection signal.

The control unit 340 is coupled to the switch units 310_1~310_N and the detecting unit 330 for receiving and generating a plurality of first control signals CS1 according to the detection signals to dynamically adjust the conduction or non-conduction of the switch units 310_1~310_N. When the switch units 310_1~310_N are turned on, the LED arrays 110_1~110_N are short-circuited and cannot emit light. In other words, when the switching unit 310_1 is turned on, the LED array 110_1 is short-circuited and cannot emit light; when the switching unit 310_1 is not turned on, current flows through the LED array 110_1, thereby causing the LED string to be emitted. Column 110_1 is illuminated.

When the switch unit 310_2 is turned on, the LED array 110_2 is short-circuited and cannot emit light; when the switch unit 310_2 is not turned on, current flows through the LED array 110_2, thereby causing the LED array 110_2. Glowing. And so on, the remaining LED series 110_3~110_N can be rendered non-illuminated or illuminated according to whether the switching units 310_3~310_N are turned on or off. Thereby, the control unit 340 can adjust the conduction quantity of the LED arrays 110_1~110_N by controlling the conduction of the switch units 310_1~310_N, thereby eliminating unnecessary power consumption.

Please refer to FIG. 4, which is a schematic circuit diagram of a linear driving light source device of the present invention. In this embodiment, the transistors M1_1~M1_N are The switch units 310_1~310_N are now available. The first end (gate terminal) of the transistor M1_1 is coupled to the control unit 340, and the second end (汲 terminal) of the transistor M1_1 is coupled to the anode end of the LED array 110_1, and the third end of the transistor M1_1 (source) Extremely) coupled to the cathode end of the LED array 110_1.

The first end (gate terminal) of the transistor M1_2 is coupled to the control unit 340, and the second end (汲 terminal) of the transistor M1_2 is coupled to the anode end of the LED array 110_2, and the third end of the transistor M1_2 (source) Extremely coupled to the cathode end of the LED array 110_2. By the way, the remaining transistors M1_3~M1_N can refer to the above description, and details are not described herein again. In the present embodiment, the transistors M1_1~M1_N are exemplified by N-type transistors, but in other embodiments, the transistors M1_1~M1_N may be P-type transistors.

When the transistors M1_1~M1_N are to be disconnected, the control unit 340 applies a first control signal CS1 (eg, a ground voltage) of, for example, a low logic level to the first end (gate terminal) of the transistor to be turned off. Thereby, the control unit 340 can control the transistors M1_1 M M1_N to be turned on or off by using voltages applied to the first ends (gate terminals) of the transistors M1_1 M M1_N.

The detecting unit 330 includes a first comparator 410 and a second comparator 420. The first input terminal (eg, the negative input terminal) of the first comparator 410 receives the first reference voltage VREF1, and the second input terminal (eg, the positive input terminal) of the first comparator 410 receives the detection voltage VD of the current source 320, The output of a comparator 410 generates a detection signal. The first input terminal (eg, the positive input terminal) of the second comparator 420 receives the second reference voltage VREF2, and the second terminal (eg, the negative input terminal) of the second comparator 420 is coupled The second input of the first comparator 410 and the output of the second comparator 420 generate a detection signal.

When the detection voltage VD is greater than the first reference voltage VREF1, the first comparator 410 generates a detection signal such as a high logic level, and the second comparator 420 generates a detection signal of a low logic level, for example, The test signal is represented by, for example, "10". When the detection voltage VD is less than the second reference voltage VREF2, the first comparator 410 generates a detection signal such as a low logic level, and the second comparator 420 generates a detection signal of a high logic level, for example, The test signal is represented by, for example, "01". When the detection voltage VD is greater than the second reference voltage VREF2 and less than the first reference voltage VREF1, both the first comparator 410 and the second comparator 420 generate a detection signal such as a low logic level, and the detection signal is, for example, Expressed as "00".

The control unit 340 includes a controller 430 and N switch control units 440_1 440 440_N. The controller 430 is coupled to the detecting unit 330 for receiving and generating a plurality of second control signals CS2 or a plurality of third control signals CS3 according to the detection signals.

The switch control units 440_1 440 440_N are coupled to the N switch units 310_1 310 310_N one-to-one. For example, the switch control unit 440_1 is coupled to the switch unit 310_1, the switch control unit 440_2 is coupled to the switch unit 310_2, and the remaining switch control units 440_3~440_N are coupled to the switch unit 310_3~310_N, and so are not described herein. And the switch control units 440_1~440_N are coupled in series, and the first switch control unit 440_1 is coupled to the controller 430 for sequentially receiving and generating the first control according to the second control signal CS2 or the third control signal CS3. Signal CS1.

Current source 320 includes an operational amplifier 450 and a transistor M2. Operational Amplifier A first input (eg, a positive input) of 450 receives an operating voltage VIN, and a second input (eg, a negative input) of operational amplifier 450 is coupled to ground via a resistor R1. The first end (gate terminal) of the transistor M2 is coupled to the output end of the operational amplifier 450, and the second end (汲 terminal) of the transistor M2 is coupled to the cathode end of the LED array 110_1 and generates a current source 320. The third terminal (source terminal) of the transistor M2 is coupled to the second input terminal of the operational amplifier 450. Here, the transistor M2 is implemented by, for example, an N-type transistor, but the present invention is not limited thereto, and the transistor M2 may be implemented using a P-type transistor.

Hereinafter, some embodiments of the segment linear driving device 100 with a waveform diagram will be described to explain how to adjust the number of conduction of the switching unit. For convenience of explanation, it is assumed that the number of switch control units is four, for example, the switch control units 440_1 to 440_4. Please refer to FIG. 5, which is the working voltage VIN, the first reference voltage VREF1, the second reference voltage VREF2, the detection voltage VD, the driving current ILED, the second control signal CS2, and the third control. A waveform diagram of the on-time of the signal CS3 and the switching units 310_1~310_4. In "Fig. 4", when the light source device 100 in which the segment linearly drives starts to operate, the switch units 310_1 to 310_4 are all in an on state.

When the controller 430 receives the detection signal for "10" for the first time, the first second control signal CS2 is generated correspondingly, and the second control signal CS2 is sequentially transmitted from the switch control unit 440_1 to the switch control unit 440_4, for example. So that the switch control unit 440_1~440_4 correspondingly generates the first control signal CS1 whose logic level is "0 1 1 1", so that the switch unit 310_1 is turned off (non-conducting), then the LED string is illuminated. Column 110_1 is turned on and illuminates.

Then, when the controller 430 receives the detection signal for "10" for the second time, the second second control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, so that the switch control units 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is "0 0 1 1", so that the switch units 310_1 and 310_2 are turned off (non-conducting), and the LEDs are arranged in series. 110_1 and 110_2 are turned on and emit light.

Then, when the controller 430 receives the detection signal for "10" for the third time, the third control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control units 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is "0 0 0 1", so that the switch units 310_1, 310_2, and 310_3 are turned off (non-conducting), and the light-emitting diodes are The series 110_1, 110_2, and 110_3 are turned on and emit light.

Then, when the controller 430 receives the detection signal for "10" for the fourth time, the fourth control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted from the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control units 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is "0 0 0 0", so that the switch units 310_1, 310_2, 310_3, and 310_4 are turned off (non-conducting), then the light is emitted. The polar body strings 110_1, 110_2, 110_3, and 110_4 are turned on and emit light.

On the other hand, if the switch units 310_1, 310_2, 310_3, and 310_4 are in a non-conducting state at this time, and the controller 430 receives the detection signal for the first time as "01" The first control signal CS3 is generated correspondingly, and the third control signal CS3 is sequentially transmitted from the switch control unit 440_1 to the switch control unit 440_4, so that the switch control units 440_1~440_4 correspondingly generate, for example, a logic level of "1". The first control signal CS1 of 0 0 0" is such that the switching unit 310_1 is turned on, and the switching units 310_2~310_4 are turned off (non-conducting), and the LED series 110_2~110_4 are turned on and emit light.

Then, when the controller 430 receives the detection signal “01” for the second time, the second third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, so that the switch control units 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is "1 1 0 0", so that the switch units 310_1 and 310_2 are turned on, and the switch units 310_3, 310_4 are turned off (non-conducting) Then, the LED arrays 110_3, 110_4 are turned on and emit light.

Then, when the controller 430 receives the detection signal "01" for the third time, the third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, causing the switch control units 440_1~440_4 to generate, for example, the first control signal CS1 whose logic level is "1 1 1 0", so that the switch units 310_1, 310_2, and 310_3 are turned on, and the switch unit 310_4 is turned off (non-conducting) Then, the LED array 110_4 is turned on and emits light.

Then, when the controller 430 receives the detection signal “01” for the fourth time, the fourth third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, making the switch control list The 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is "1 1 1 1", so that the switch units 310_1, 310_2, 310_3 and 310_4 are all turned on. In this way, the embodiment can accurately control the number of conduction of the switch units 310_1~310_N according to the state of the detection signal, so that the LED series 110_1~110_N can sequentially emit light in series, and the transistor M2 can be lowered. Power consumption.

When the detection signal received by the controller 430 is that the detection voltage VD is greater than the second reference voltage VREF2 and less than the first reference voltage VREF1, the controller 430 does not provide the second control signal CS2 or the third control signal CS3. The number of conductions of the switching units 310_1 to 310_N is maintained, that is, the number of light emission in the LED arrays 110_1 to 110_N is maintained.

Please refer to FIG. 6 , which is the working voltage VIN, the first reference voltage VREF1, the second reference voltage VREF2, the detection voltage VD, the driving current ILED, the second control signal CS2, and the third control. Another waveform diagram of the on-time of the signal CS3 and the switching units 310_1~310_4. The difference between this embodiment and the embodiment of FIG. 5 is that the order of the switching units is sequentially turned on according to the third control signal CS3. In other words, the embodiment of the "figure 5" is based on the first to fourth third control signals CS3, sequentially turning on the switch units 310_1~310_4, and the embodiment is based on the first to the fourth The three control signals CS3 sequentially turn on the switch units 310_4~310_1. In addition, the sequence of the disconnecting switch units 310_4 to 310_1 of the embodiment of the "figure 6" and the driving method thereof can be referred to the description of "figure 5", and therefore will not be described herein.

Please refer to FIG. 7 , which is the working voltage VIN, the first reference voltage VREF1, the second reference voltage VREF2, the detection voltage VD, the driving current ILED, the second control signal CS2, and the third control. A further waveform diagram of the on-time of the signal CS3 and the switching units 310_1~310_4. The difference between the embodiment of "Fig. 7" and the embodiment of "Fig. 5" is that the operating voltage VIN of "Fig. 7" is a phase-cut sine wave. In the "Fig. 7", it can be seen that at the time point T1, the controller 430 receives the detection signal for "10" for the first time, and correspondingly generates the first second control signal CS2, so that the switch unit 310_1 is disconnected (not conducting).

At this time, although the switch unit 310_1 is turned off to increase the illumination of the LED array 110_1, the detection unit 330 still detects that the detection voltage VD is greater than the first reference voltage VREF1, so that the controller 430 receives the second time. The detection signal is "10". Then, the controller 430 generates a second second control signal CS2 correspondingly, so that the switch units 310_1 and 310_2 are turned off (non-conducting).

At this time, the switch units 310_1 and 310_2 are turned off to increase the illumination of the LED arrays 110_1 and 110_2, but the detection unit 330 still detects that the detection voltage VD is greater than the first reference voltage VREF1, so that the controller 430 The detection signal received "three" three times. Then, the controller 430 generates a third second control signal CS2 correspondingly, so that the switch units 310_1, 310_2, and 310_3 are turned off (non-conducting). Therefore, the controller 430 continuously generates the first to third second control signals CS2 to sequentially turn off the switch units 310_1, 310_2, and 310_3, so that the LED arrays 110_1, 110_2, and 110_3 are turned on and emit light. Further, the detection voltage VD is lowered.

Then, after a period of time, when the controller 430 receives the detection message for the fourth time When the number is "10", the fourth second control signal CS2 is generated correspondingly, and the second control signal CS2 is sequentially transmitted from the switch control unit 440_1 to the switch control unit 440_4, so that the switch control units 440_1~440_4 generate corresponding logic, for example. The first control signal CS1 of the level "0 0 0 0" is such that the switch units 310_1, 310_2, 310_3, and 310_4 are turned off (non-conducting), and the LED arrays 110_1, 110_2, 110_3, and 110_4 are all turned on. And shine.

In addition, the description of the sequence of the on/off switch units 310_1 to 310_4 of the embodiment of the "FIG. 7" can be referred to the description of "fifth figure", and therefore will not be described herein. In another embodiment, the on-off switch units 310_1~310_4 of the embodiment of the "FIG. 7" can also be driven in the order of the on-off switch units 310_4~310_1 as shown in "FIG. 6". For detailed description, refer to " The description of Fig. 6 will not be repeated here.

The driving method described in the foregoing embodiment is that the number of the light emitting diodes in each of the light emitting diode series 110_1~110_4 is the same, that is, j=0, and the light emitting diode array is driven in an extended manner. . For example, when the operating voltage VIN continues to rise, each LED array will be turned on and illuminate sequentially, and when the operating voltage VIN continues to decrease, each LED array will be sequentially turned off without Glowing. However, the driving method of the present invention is not limited to this. Hereinafter, other embodiments will be described.

It is assumed that the number of light-emitting diodes in the LED arrays 110_1~110_4 is different, that is, j≠0, and the driving device 150 will drive the light-emitting diodes in a carry manner (for example, a segment driving manner). The series 110_1~110_4 are turned on and emit light.

For example, when the operating voltage VIN rises and the controller 430 receives the detection signal for “10” for the first time, the first second control signal CS2 is generated correspondingly, and The second control signal CS2 is sequentially transmitted to the switch control unit 440_4, for example, by the switch control unit 440_1, so that the switch control unit 440_1~440_4 correspondingly generates the first control signal CS1 whose logic level is “0 1 1 1”, so that the switch When the unit 310_1 is turned off (non-conducting), the LED array 110_1 is turned on and emits light.

Then, when the controller 430 receives the detection signal for "10" for the second time, the second second control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control unit 440_1~440_4 correspondingly generates the first control signal CS1 whose logic level is "1 0 1 1", so that the switch unit 310_2 is turned off (non-conducting), and the LED array 110_2 is turned on. And shine.

Then, when the controller 430 receives the detection signal for "10" for the third time, the third control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control unit 440_1~440_4 correspondingly generates the first control signal CS1 whose logic level is "1 1 0 1", so that the switch unit 310_3 is turned off (non-conducting), and the LED array 110_3 is turned on. And shine.

Then, when the controller 430 receives the detection signal for "10" for the fourth time, the fourth control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted from the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control unit 440_1~440_4 correspondingly generates the first control signal CS1 whose logic level is "1 1 1 0", so that the switch unit 310_4 is turned off (non-conducting), and the LED array 110_4 is turned on. And shine.

On the other hand, when the operating voltage VIN drops and the controller 430 receives the detection signal "01" for the first time, the first third control signal CS3 is generated correspondingly, and the third control signal CS3 is sequentially controlled by the switch. The unit 440_1 is transmitted to the switch control unit 440_4 such that the switch control unit 440_1~440_4 correspondingly generates the first control signal CS1 whose logic level is "1 1 0 1", for example, so that the switch unit 310_4 is turned on, and the switch unit 310_3 is turned off ( If not conducting, the LED array 110_3 is turned on and emits light.

Then, when the controller 430 receives the detection signal “01” for the second time, the second third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, so that the switch control unit 440_1~440_4 correspondingly generates the first control signal CS1 whose logic level is "1 0 1 1", so that the switch unit 310_3 is turned on, and the switch unit 310_2 is turned off (not turned on), then the light is turned on. The polar body string 110_2 is turned on and emits light.

Then, when the controller 430 receives the detection signal "01" for the third time, the third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control unit 440_1~440_4 correspondingly generates the first control signal CS1 whose logic level is "0 1 1 1", so that the switch unit 310_2 is turned on, and the switch unit 310_1 is turned off (non-conducting), then the light is turned on. The polar body string 110_1 is turned on and emits light.

Then, when the controller 430 receives the detection signal “01” for the fourth time, the fourth third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, making the switch control list The 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is "1 1 1 1", so that the switch units 310_1, 310_2, 310_3 and 310_4 are all turned on, and the LED series 110_1~110_4 are not The conduction does not illuminate.

The driving device 150 drives the LED arrays 110_1 110 110_4 to be turned on and emits light in a binary manner. However, the present invention is not limited thereto, and may be a carry mode of 2 or more (for example, carry of 3, 4, 5, ..., etc.) The driving light-emitting diodes are turned on in series and emit light.

For example, assuming that the LED arrays 110_1~110_4 are driven in a 3-bit manner, when the controller 430 receives the detection signal “10” every time, the controller 430 controls the LEDs. The order of the series of 110_1~110_4 being turned on and emitting light is: light emitting diode series 110_1; light emitting diode series 110_1 and 110_2; light emitting diode series 110_3 (representing 3-digit generation); light emitting diode The series 110_1 and 110_3; the LED series 110_1, 110_2 and 110_3; the LED series 110_3 and 110_4; the LED series 110_1, 110_3 and 110_4; the LED series 110_1, 110_2, 110_3 and 110_4. It can be seen that when the controller 430 controls the LED array 110_3 to be turned on and emit light, and the remaining LED series 110_1, 110_2, and 110_4 are not turned on and do not emit light, it indicates that the 3-bit occurs.

Then, when the controller 430 receives the detection signal “01” every time, the controller 430 controls the LED sequence 110_1~110_4 to be turned on and emits light in order: the LED array 110_1, 110_3 and 110_4; light-emitting diode series 110_3 and 110_4; light-emitting diode series 110_1, 110_2 and 110_3; Diode series 110_1 and 110_3; LED series 110_3; LED series 110_1 and 110_2; LED series 110_1; LED series 110_1~110_4 are not conducting and not emitting .

In addition, if the controller 430 controls the LEDs in series according to the driving manner, the LEDs are sequentially turned on and emit light. And when the controller 430 controls the LED array 110_4 to be turned on and emit light, and the remaining LED series 110_1, 110_2, and 110_3 are not turned on and do not emit light, it indicates that the 4-bit occurs. The driving of the remaining carry modes is analogous, so it will not be described here.

It is assumed that the number of the light-emitting diodes in the light-emitting diode series 110_1~110_4 is the same (ie, j=0), and the parts are different (ie, j≠0), and when two adjacent light-emitting diodes When the number of the light-emitting diodes in the series is the same, the driving will be driven in an extended manner, and when the number of the light-emitting diodes in the adjacent two LED arrays is different, the way will be carried. (eg segment driven mode) driver.

For example, the number of the light emitting diodes in the LED arrays 110_1 and 110_2 is the same (ie, j=0), and the number of the LEDs in the LED arrays 110_2, 110_3, and 110_4 is different. (ie, j≠0), and the driving device 150 drives the LED arrays 110_1~110_4 to be turned on and emit light by the driving method of the extension and the carry.

For example, when the operating voltage VIN rises and the controller 430 receives the detection signal for "10" for the first time, the first second control signal CS2 is generated correspondingly, and the second control signal CS2 is sequentially switched, for example. The control unit 440_1 transmits to the switch control unit 440_4 such that the switch control units 440_1~440_4 correspondingly generate, for example, logic The first control signal CS1 of the "0 1 1 1" level is such that the switching unit 310_1 is turned off (non-conducting), and the LED array 110_1 is turned on and emits light.

Then, when the controller 430 receives the detection signal for "10" for the second time, the second second control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control units 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is "0 0 1 1", so that the switch units 310_1, 310_2 are turned off (non-conducting), and the LEDs are arranged in series. 110_1, 110_2 are turned on and emit light. At this time, the driving device 150 drives the light emitting diode series 110_1, 110_2 to be turned on and emit light in an extended manner.

Then, when the controller 430 receives the detection signal for "10" for the third time, the third control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control unit 440_1~440_4 correspondingly generates the first control signal CS1 whose logic level is "1 1 0 1", so that the switch unit 310_3 is turned off (non-conducting), and the LED array 110_3 is turned on. And shine. At this time, the driving device 150 drives the light emitting diode series 110_3 to conduct and emit light in a carry manner.

Then, when the controller 430 receives the detection signal for "10" for the fourth time, the fourth control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted from the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control units 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is "0 1 0 1", so that the switch units 310_1, 310_3 are turned off (non-conducting), then the LEDs are arranged in series. 110_1, 110_3 are turned on and emit light.

Then, when the controller 430 receives the detection signal for "10" for the fifth time, the fifth control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control units 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is "0 0 0 1", so that the switch units 310_1, 310_2, 310_3 are turned off (non-conducting), and the light-emitting diodes are The series 110_1, 110_2, 110_3 are turned on and emit light.

Then, when the controller 430 receives the detection signal for "10" for the sixth time, the sixth control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control unit 440_1~440_4 correspondingly generates the first control signal CS1 whose logic level is "1 1 1 0", so that the switch unit 310_4 is turned off (non-conducting), and the LED array 110_4 is turned on. And shine. At this time, the driving device 150 drives the light emitting diode series 110_4 to conduct and emit light in a carry manner.

Then, when the controller 430 receives the detection signal for "10" for the seventh time, the seventh control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control units 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is "0 1 1 0", so that the switch units 310_1, 310_4 are turned off (non-conducting), and the LEDs are arranged in series. 110_1, 110_4 are turned on and emit light.

Then, when the controller 430 receives the detection signal “10” for the eighth time, the eighth second control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, making the switch control list The 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is “0 0 1 0”, so that the switch units 310_1, 310_2, and 310_4 are turned off (non-conducting), and the LED arrays 110_1 and 110_2 are turned off. 110_4 turns on and emits light.

Then, when the controller 430 receives the detection signal “10” for the ninth time, the ninth second control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control units 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is "1 1 0 0", so that the switch units 310_3, 310_4 are turned off (non-conducting), and the LEDs are arranged in series. 110_3, 110_4 are turned on and emit light.

Then, when the controller 430 receives the detection signal for "10" for the tenth time, the 10th second control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, such that the switch control units 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is "0 1 0 0", so that the switch units 310_1, 310_3, 310_4 are turned off (non-conducting), and the light-emitting diodes are The series 110_1, 110_3, 110_4 are turned on and emit light.

Then, when the controller 430 receives the detection signal as “10” for the eleventh time, the eleventh second control signal CS2 is correspondingly generated, and the second control signal CS2 is sequentially transmitted by the switch control unit 440_1 to the switch control. The unit 440_4 causes the switch control units 440_1~440_4 to generate, for example, the first control signal CS1 whose logic level is “0 0 0 0”, so that the switch units 310_1~310_4 are all turned off (non-conducting), and the light-emitting diode is The series 110_1~110_4 are all turned on and emit light.

On the other hand, when the operating voltage VIN drops and the controller 430 receives it for the first time When the detection signal is "01", the first third control signal CS3 is generated correspondingly, and the third control signal CS3 is sequentially transmitted from the switch control unit 440_1 to the switch control unit 440_4, so that the switch control units 440_1~440_4 are correspondingly generated. For example, the first control signal CS1 whose logic level is “0 1 0 0” is such that the switching unit 310_2 is turned on, and the switching units 310_1, 310_3, and 310_4 are turned off (non-conducting), and the LED arrays 110_1 and 110_3 are turned off. 110_4 turns on and emits light.

Then, when the controller 430 receives the detection signal “01” for the second time, the second third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, causing the switch control units 440_1~440_4 to generate, for example, the first control signal CS1 whose logic level is "1 1 0 0", so that the switch units 310_1, 310_2 are turned on, and the switch units 310_3, 310_4 are turned off (non-conducting) Then, the LED arrays 110_3, 110_4 are turned on and emit light.

Then, when the controller 430 receives the detection signal "01" for the third time, the third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, causing the switch control units 440_1~440_4 to generate, for example, the first control signal CS1 whose logic level is "0 0 1 0", so that the switch unit 310_3 is turned on, and the switch units 310_1, 310_2, 310_4 are turned off (non-conducting) Then, the LED arrays 110_1, 110_2, and 110_4 are turned on and emit light.

Then, when the controller 430 receives the detection signal "01" for the fourth time, the fourth third control signal CS3 is generated correspondingly, and the third control signal CS3 is sequentially The switch control unit 440_1 is transmitted to the switch control unit 440_4 such that the switch control units 440_1~440_4 correspondingly generate the first control signal CS1 whose logic level is "0 1 1 0", so that the switch units 310_2, 310_3 are turned on, and the switch unit When 310_1 and 310_4 are turned off (non-conducting), the LED series 110_1 and 110_4 are turned on and emit light.

Then, when the controller 430 receives the detection signal "01" for the fifth time, the fifth third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, causing the switch control units 440_1~440_4 to generate, for example, the first control signal CS1 whose logic level is "1 1 1 0", so that the switch units 310_1~310_3 are turned on, and the switch unit 310_4 is turned off (non-conducting), The LED array 110_4 is turned on and emits light.

Then, when the controller 430 receives the detection signal “01” for the sixth time, the sixth third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, causing the switch control units 440_1~440_4 to generate, for example, the first control signal CS1 whose logic level is "0 0 0 1", so that the switch unit 310_4 is turned on, and the switch units 310_1~310_3 are turned off (non-conducting), The LED series 110_1~110_3 are turned on and emit light.

Then, when the controller 430 receives the detection signal “01” for the seventh time, the seventh third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, causing the switch control units 440_1~440_4 to generate, for example, the first control signal CS1 whose logic level is "0 1 0 1", so that the switch units 310_2, 310_4 are turned on, and the switch unit 310_1, When 310_3 is turned off (non-conducting), the LED series 110_1, 110_3 are turned on and emit light.

Then, when the controller 430 receives the detection signal “01” for the eighth time, the eighth third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, causing the switch control units 440_1~440_4 to generate, for example, the first control signal CS1 whose logic level is "1 1 0 1", so that the switch units 310_1, 310_2, 310_4 are turned on, and the switch unit 310_3 is turned off (non-conducting) Then, the LED array 110_3 is turned on and emits light.

Then, when the controller 430 receives the detection signal "01" for the ninth time, the ninth third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, causing the switch control units 440_1~440_4 to generate, for example, the first control signal CS1 whose logic level is "0 0 1 1", so that the switch units 310_3, 310_4 are turned on, and the switch units 310_1, 310_2 are turned off (non-conducting) Then, the LED arrays 110_1 and 110_2 are turned on and emit light.

Then, when the controller 430 receives the detection signal "01" for the tenth time, the tenth third control signal CS3 is correspondingly generated, and the third control signal CS3 is sequentially transmitted by the switch control unit 440_1 to the switch control unit. 440_4, causing the switch control units 440_1~440_4 to generate, for example, the first control signal CS1 whose logic level is "0 1 1 1", so that the switch units 310_2, 310_3, 310_4 are turned on, and the switch unit 310_1 is turned off (non-conducting) Then, the LED array 110_1 is turned on and emits light.

After that, when the controller 430 receives the detection signal of "01" for the eleventh time, The eleventh third control signal CS3 is generated correspondingly, and the third control signal CS3 is sequentially transmitted from the switch control unit 440_1 to the switch control unit 440_4, so that the switch control units 440_1~440_4 correspondingly generate, for example, a logic level of "1 1 1 The first control signal CS1 of 1" is such that the switch units 310_1~310_4 are all turned on, and the LED arrays 110_1~110_4 are not turned on and do not emit light.

Please refer to FIG. 8 , which is a schematic diagram of another linear drive light source device of the present invention. The segment linearly driven light source device 800 includes N light emitting diode strings 110_1 110 110_N, a driving device 150 and N auxiliary light emitting diode strings 810_1 810 810_N, where N is a positive integer greater than one. For the description of the embodiment of the first embodiment, the description of the embodiment of the first embodiment is omitted.

The cathode end of the k-th auxiliary light-emitting diode series is coupled to the anode end of the k-th light-emitting diode series, and the anode end of the k-th auxiliary light-emitting diode series is coupled to the k+1th light-emitting diode The cathode end of the pole body series, where 0<k N-1. That is, the cathode end of the second auxiliary light-emitting diode series 810_2 is coupled to the anode end of the second light-emitting diode series 110_2, and the anode end of the second auxiliary light-emitting diode series 810_2 is coupled. The cathode end of the third LED array 110_3, and the coupling manner of the cathode end and the anode end of the other auxiliary LEDs 810_3 to 810_N are analogous.

In addition, the anode terminal of the Nth (ie, k+1) auxiliary light-emitting diode series 810_N receives the operating voltage VIN, and the operating voltage VIN is, for example, a voltage rectified by the AC voltage through the bridge rectifier or by a DC voltage. The converted voltage. The cathode end of the first auxiliary light-emitting diode series 810_1 is coupled to the first light-emitting diode series The anode end of 110_1. In this embodiment, the auxiliary light-emitting diode series 810_1-810_N each include M light-emitting diodes, where M is a positive integer greater than or equal to zero. The user can adjust the number of the light-emitting diodes in the auxiliary light-emitting diode series 810_1~810_N according to their needs. Further, the number of the light-emitting diodes in the auxiliary light-emitting diode series 810_1 to 810_N may be the same or different.

Further, the difference between the embodiment and the embodiment of FIG. 1 is that when the segment linearly driven light source device 800 starts to operate, the operating voltage VIN is greater than the illumination in the auxiliary LED series 810_1~810_N. The total on-state voltage of the diodes enables the auxiliary light-emitting diode series 810_1~810_N to be turned on and emit light. Then, the driving device 150 sequentially turns on or off the number of conduction of the LED series 110_1~110_N according to the magnitude of the detection voltage VD, and can refer to the implementation examples of "1st" to "7th" and The description of the foregoing embodiment is omitted here. Therefore, this embodiment can also eliminate unnecessary power consumption.

The segment linear driving light source device disclosed in the embodiment of the present invention controls a switch unit by connecting a switch unit in parallel with each of the light emitting diodes, and controlling each switching unit according to the detection voltage of the current source by the driving device. Turns on or off, which in turn causes the light-emitting diodes to be turned on or off sequentially. In addition, the number of the light-emitting diodes in each of the LED arrays is adjusted in an iterative manner to change the driving manner of the LED array (for example, in an extended or carry manner) to increase or decrease the light emission. The number of conductions of the polar body series. In this way, the power consumption of the circuit can be reduced and the power factor is high.

The present invention has been disclosed in the foregoing embodiments, and is not intended to limit the scope of the present invention. The scope of patent protection of the present invention is defined by the scope of the appended claims.

100,800‧‧‧fragment linear drive light source device

110_1~110_N‧‧‧Light diode series

150‧‧‧ drive

310_1~310_N‧‧‧Switch unit

320‧‧‧current source

330‧‧‧Detection unit

340‧‧‧Control unit

410‧‧‧First comparator

420‧‧‧Second comparator

430‧‧‧ Controller

440_1~440_N‧‧‧Switch Control Unit

450‧‧‧Operational Amplifier

810_1~810_N‧‧‧Auxiliary LED

R1‧‧‧ resistance

M1_1~M1_N, M2‧‧‧ transistor

CS1‧‧‧First control signal

CS2‧‧‧second control signal

CS3‧‧‧ third control signal

ILED‧‧‧ drive current

VIN‧‧‧ working voltage

VD‧‧‧Detection voltage

VREF1‧‧‧ first reference voltage

VREF2‧‧‧second reference voltage

T1‧‧‧ time

Fig. 1 is a schematic view showing a light source device of a segment linear drive of the present invention.

Fig. 2A is an embodiment of the arrangement of the number of light-emitting diodes in the series of light-emitting diodes of the present invention.

FIG. 2B is another embodiment of the number arrangement of the light-emitting diodes of the LED array of the present invention.

FIG. 2C is still another embodiment of the arrangement of the number of light-emitting diodes of the LED array of the present invention.

Fig. 3 is a detailed schematic view showing a driving device of a linear driving light source device of the present invention.

Fig. 4 is a circuit diagram showing a light source device of a segment linear drive of the present invention.

Figure 5 is a waveform diagram of the working voltage, the first reference voltage, the second reference voltage, the detection voltage, the driving current, the second control signal, the third control signal, and the on-time of the switching unit of the present invention.

Figure 6 is another waveform diagram of the working voltage, the first reference voltage, the second reference voltage, the detection voltage, the driving current, the second control signal, the third control signal, and the on-time of the switching unit of the present invention.

Figure 7 is still another waveform diagram of the working voltage, the first reference voltage, the second reference voltage, the detection voltage, the driving current, the second control signal, the third control signal, and the on-time of the switching unit of the present invention.

Figure 8 is a schematic view of another embodiment of the linear drive light source device of the present invention.

100‧‧‧Segment linear drive light source unit

110_1~110_N‧‧‧Light diode series

150‧‧‧ drive

ILED‧‧‧ drive current

VIN‧‧‧ working voltage

VD‧‧‧Detection voltage

Claims (21)

A light source device for linearly driving a segment, comprising: N light emitting diodes arranged in series, the N light emitting diodes having a plurality of light emitting lights coupled in series a diode, wherein the number of the light-emitting diodes in the i+1th LED array is adjusted according to the number of the LEDs in the ith LED array, and The number of the light-emitting diodes is adjusted by GLED _{i +1} =( j +1) GLED _i , and GLED _{i +1} is the light-emitting diodes in the i+ 1th LED array. The number of GLED _i is the number of the light-emitting diodes in the i-th LED array , N is a positive integer greater than 1, i is a positive integer greater than 0, and j is an integer greater than or equal to 0 and j is an adjustable variable, 0<i N-1; and a driving device coupled to the N LED arrays for providing a driving current to drive the N LED series, and the driving device detects the first LED A detection voltage of the cathode end of the series of poles determines the number of conduction of the N LED arrays. The light source device of claim 1 is characterized in that, when j=0 between each of the N light-emitting diode strings and the detection voltage is greater than a first reference voltage, the driving device The N light emitting diode strings are driven in an extended manner to increase the number of conduction of the N light emitting diode strings. The apparatus of claim 1, wherein the segment is linearly driven by the light source device, wherein j=0 between each of the N light emitting diode strings and the detection voltage is less than a second reference At the time of voltage, the driving device drives the N LED arrays in an extended manner to reduce the number of conduction of the N LED arrays. The apparatus of claim 1, wherein the driving device is configured to The carry mode drives the corresponding N light emitting diodes in series. The apparatus of claim 1, wherein the driving device is configured to The carry mode drives the corresponding N light emitting diodes in series. The light source device of claim 1, wherein a portion of the N light-emitting diodes is j=0, and a portion between the N light-emitting diodes is j≠0 and the When the detection voltage is greater than a first reference voltage, the driving device drives the corresponding N light emitting diodes in series to be connected in a driving manner with an extension and a carry. The light source device of claim 1, wherein a portion of the N light-emitting diodes is j=0, and a portion between the N light-emitting diodes is j≠0 and the When the detection voltage is less than a second reference voltage, the driving device drives the corresponding N light emitting diodes in series to be driven in a driving manner with an extension and a carry. The light source device of claim 1 is characterized in that, when the detection voltage is greater than a second reference voltage and less than a first reference voltage, the driving device The number of conductions of the N light emitting diodes is maintained. The light source device of claim 1 is characterized in that: the driving device comprises: N switching units, which are coupled in parallel to the N LED arrays in a one-to-one manner; a current source, the first end thereof Coupling the cathode end of the first LED array and providing the driving current to drive the N LED arrays, and the first end of the current source provides the detection voltage; The first end of the current source is coupled to receive and according to the detection voltage of the current source, a first reference voltage and a second reference voltage to generate a detection signal; and a control unit coupled The N switch units and the detecting unit are configured to receive and generate a plurality of first control signals according to the detection signals to dynamically adjust the number of conduction of the N switch units. The light source device of the linear driving device of claim 9, wherein j=0 between each of the N LED arrays and the detection signal is greater than the detection voltage of the current source When a voltage is referenced, the control unit controls the corresponding N switching units to be turned off in an extended manner to reduce the number of conduction of the N switching units. The light source device of claim 9, wherein when each of the N light-emitting diode strings is j=0 and the detection signal is the current source, the detection voltage is less than the first When the voltage is referenced, the control unit controls the corresponding N switching units to be disconnected in an extended manner to increase the N switching units. Number of conduction. The light source device of claim 9, wherein when each of the N light emitting diode strings is j≠0 and the detection signal is the current source, the detection voltage is greater than the first When a voltage is referenced, the control unit controls the corresponding N switching units to be turned on in a carry manner. The light source device of claim 9, wherein when each of the N light-emitting diodes is j≠0 and the detection signal is less than one of the detection voltages of the current source, When the voltage is referenced, the control unit controls the corresponding N switching units to be turned on in a carry manner. a segment linearly driven light source device according to claim 9, wherein a portion j=0 between the N light-emitting diode strings and a portion between the N light-emitting diode strings and When the detection signal is that the detection voltage of the current source is greater than the first reference voltage, the control unit controls the corresponding N switching units to be turned on in a driving manner with an extension and a carry. a segment linearly driven light source device according to claim 9, wherein a portion j=0 between the N light-emitting diode strings and a portion between the N light-emitting diode strings and When the detection signal is that the detection voltage of the current source is less than the second reference voltage, the driving device controls the corresponding N switching units to be turned on in a driving manner with an extension and a carry. The apparatus of claim 9, wherein the detection unit maintains the N when the detection signal is greater than the second reference voltage and less than the first reference voltage. The number of conductions of the switching units. The apparatus of claim 9, wherein the detecting unit comprises: a first comparator, the first input receiving the first reference voltage, and the second input receiving the current source Detecting a voltage, the output terminal generates the detection signal; and a second comparator, the first input terminal receives the second reference voltage, and the second input terminal is coupled to the second input end of the first comparator The detection signal is generated at the output end. The device of claim 9, wherein the control unit comprises: a controller coupled to the detecting unit for receiving and generating a plurality of second control signals or according to the detecting signal a third control signal; and N switch control units, which are coupled to the N switch units one-to-one, and the N switch control units are coupled in series, and the first switch control unit is coupled to the controller for The first control signals are generated in sequence according to the second control signals or the third control signals. The apparatus of claim 9, wherein the current source comprises: an operational amplifier having a first input receiving an operating voltage, a second input coupled to the ground through a resistor; and an electrical a first end of the crystal is coupled to the output end of the operational amplifier, a second end thereof generates the detection voltage of the current source, and a third end of the crystal is coupled to the operational amplifier The second input. The light source device for linearly driving the segment according to claim 1, further comprising: N auxiliary light emitting diodes, wherein the cathode end of the kth auxiliary light emitting diode series is coupled to the kth light emitting diode string The anode end of the column, the anode end of the k-th auxiliary light-emitting diode series is coupled to the cathode end of the k+1th light-emitting diode series, and the anode end of the k+1th auxiliary light-emitting diode series Receiving a working voltage, the cathode end of the first auxiliary light-emitting diode series is coupled to the anode end of the first light-emitting diode series, wherein 0<k N-1. The segment linearly driven light source device of claim 20, wherein the N auxiliary light emitting diode strings each comprise M light emitting diodes, wherein M is a positive integer greater than or equal to zero.