CN109429406A - Apparatus for driving a plurality of light emitting diodes using high voltage - Google Patents

Abstract

The device for driving the light emitting diode by using the high voltage comprises two light emitting diode driving circuits and two switching devices which are switched on or off by a general controller so as to connect the two light emitting diode driving circuits in two different structures. Each of the light emitting diode driving circuits has a light emitting diode unit formed of a plurality of light emitting diode segments. Each LED segment has a bypass switch controlled by the LED controller to bypass or connect the LED segment in the LED unit. The two switching devices are controlled in such a way that the two led driving circuits are connected in parallel when the input voltage is in the range of a rectified 90 vac voltage to a rectified 140 vac voltage. The two switching devices are controlled to connect the led segments of the led units in a led driver circuit in series with another led driver circuit when the input voltage is in the range of rectified 180 vac to rectified 265 vac.

Description

Device that uses high voltage to drive multiple light emitting diodes

technical field

The present invention relates to a light emitting diode (LED) based lighting device, and more particularly to a device for driving a light emitting diode (LED) based lighting device using a high input voltage.

Background technique

Light Emitting Diode (LED) is a semiconductor-based light source, which is often used in indicators of low-power meters and home appliances. The application of light-emitting diodes in various lighting devices has become more and more common. For example, high-brightness light-emitting diodes have been widely used in traffic lights, vehicle indicator lights, and brake lights. In recent years, lighting devices using strings of high-voltage light-emitting diodes have also been developed to replace conventional incandescent and fluorescent bulbs.

The current-versus-voltage (IV) characteristic curve of a light-emitting diode is similar to that of an ordinary diode. When the voltage applied to the light-emitting diode is less than the forward voltage of the diode, only a very small current flows through the light-emitting diode. When the voltage exceeds the forward voltage, the current through the LED increases substantially. In general, the luminous intensity of LED-based lighting is proportional to the current passing through most operating ranges, but not at high currents. The driving devices usually designed for lighting devices based on light-emitting diodes mainly provide a constant current, so as to emit stable light and prolong the life of the light-emitting diodes.

In order to improve the brightness of light-emitting diode-based lighting devices, a plurality of light-emitting diodes are usually connected in series to form a light-emitting diode-based lighting unit, and a plurality of light-emitting diode-based lighting units can be further connected in series to form a lighting unit. device. The required operating voltage of each lighting fixture is usually determined by the forward voltage of the LEDs in the lighting unit, how many LEDs are in each lighting unit, how each lighting unit is connected to each other, and how each lighting How the unit receives the voltage from the power supply in the lighting installation.

Therefore, in most applications, some type of power supply voltage conversion device is required to convert the high voltage of the generally more common power supply to a lower voltage to provide one or more LED based lighting. unit. Because such a voltage conversion device is required, the efficiency of the light-emitting diode-based lighting equipment is reduced, the cost is increased, and it is difficult to reduce the size thereof.

In order to increase the efficiency and reduce the size of LED-based lighting devices, a number of technologies have been developed to enable these devices to use operating voltages such as 110 VAC or 220 VAC without the use of voltage conversion devices. Generally, LEDs in lighting devices are divided into a plurality of LED segments, each LED segment can be selectively turned on or off through an associated switch or current source, and with the operating AC voltage increasing or decreasing, A controller is used to control the switch or current source.

As more and more light-emitting diode-based lighting equipment is used in high-brightness lighting equipment with high input voltage as the power supply, a driving device is designed that uses the AC high voltage from the wall power supply as the input voltage, and can The ingenious and efficient connection of LED-based lighting strings has created a much-needed strong demand.

SUMMARY OF THE INVENTION

The present invention is designed to provide a device that can efficiently drive a string of light emitting diodes over a range of input voltages provided by different high voltage ranges, such as from 90 volts to 140 volts or from 180 volts to 265 volts AC.

According to a preferred embodiment of the present invention, the LED lighting device includes two LED driving circuits controlled by a general controller. A generic controller is used to control two switches that can be turned on or off to connect the two LED driver circuits in two different configurations. In addition, the general-purpose controller controls the current flowing through one of the LED driving circuits according to the change of the input voltage.

Each LED driver circuit includes an LED unit in which there are multiple LEDs divided into multiple LED segments, each LED segment having a bypass switch associated therewith. Except for the first and last LED segments, each LED segment has a positive terminal and a negative terminal connected to the negative terminal of the LED segment preceding it and the positive terminal of the LED segment following it, respectively. There is also an LED controller that controls each bypass switch to bypass or connect the associated LED segment in the LED unit. The light emitting diode unit is in turn connected to a current source.

In the present invention, the bypass switch associated with each LED segment can be connected in two different ways. In the first approach, one end of the bypass switch is connected to the negative terminal of the associated LED segment, and the other end of the bypass switch is connected to a common node in the LED driver circuit. In another approach, both ends of the bypass switch are connected to the positive and negative terminals of the associated light emitting diode segment, respectively.

In the first manner, the current source of the LED driver circuit connects the common node to ground, and as the input voltage applied to the LED unit increases, the associated bypass switches can be turned on and off one by one in sequence, Then, as the input voltage applied to the light emitting diode unit decreases, the associated bypass switches are turned on and off one by one in reverse order. The associated bypass switches can also be all turned on at the beginning, and then turned off one by one as the input voltage applied to the light-emitting diode unit increases, and then turned off one by one as the input voltage applied to the light-emitting diode unit decreases. The reverse sequence is turned on one by one. In this manner, the bypass switch associated with the last LED segment is always on.

In a second manner, the current source of the LED driver circuit connects the negative terminal of the last LED segment to ground. The associated bypass switches can all be turned on initially, then turned off one by one as the input voltage applied to the LED unit increases, and then reversed as the input voltage applied to the LED unit decreases. The sequence is turned on one by one. In the second mode, each associated bypass switch can also be selectively turned on or off instead of sequentially, so that it can be turned on appropriately according to the voltage value of the input voltage applied to the light emitting diode unit. number of LEDs.

The first switch connects the positive terminal of the first LED segment of the first LED driving circuit to the positive terminal of the first LED segment of the second LED driving circuit, and the second switch connects the last LED of the first LED driving circuit. The negative terminal of one LED segment is connected to the positive terminal of the first LED segment of the second LED driver circuit. The input voltage is then connected to the positive terminal of the first LED segment of the first LED driver circuit and the general controller.

When the input voltage V _IN is in the range of the rectified 90V AC voltage to the rectified 140V AC voltage, the general controller turns on the first switch and turns off the second switch, so that the two LED driving circuits are connected in parallel. When the input voltage V _IN is in the range of the rectified 180V AC voltage to the rectified 265V AC voltage, the general controller turns off the first switch and turns on the second switch, so that the light in the first LED driving circuit emits light The LED segment of the diode unit is connected in series with the second LED driving circuit.

In the first preferred embodiment, the general controller sends a current setting signal to control the current flowing through the current source of the first LED driving circuit according to the change of the input voltage. In a modified version of this preferred embodiment, a current sensing signal is fed back to the general controller from the current source of the second LED driver circuit, so that the general controller can current to control the current flowing through the current source of the first light emitting diode driving circuit.

According to a second preferred embodiment of the present invention, the two light emitting diode drive circuits share a common current source instead of each having its own current source. The light-emitting diode units and the two switches of the two light-emitting diode driving circuits are connected in the same manner as in the first preferred embodiment described above. However, in each LED driver circuit, the negative terminal of the last LED segment is connected in series with a voltage controlled current limiting element connected to a shared common current source.

The general-purpose controller in this second preferred embodiment, in addition to controlling two switches to connect two LED driving circuits in parallel, or connecting the LED segments of the LED units in the first LED driving circuit with the second LED driving circuit The diode driver circuits are connected in series and send out two separate voltage control signals to respectively control two voltage controlled current limiting elements connected to a shared common current source and a current setting signal to control the current current through the shared common current source.

Description of drawings

FIG. 1 shows a block diagram of an apparatus for driving light-emitting diodes using high voltage according to a first preferred embodiment of the present invention.

Figure 2 shows an example of how the LED controller controls the bypass switch according to the input voltage applied to the LED unit.

Figure 3 shows another example of how the LED controller controls the bypass switch according to the input voltage applied to the LED unit.

FIG. 4 shows a block diagram of an apparatus for driving light-emitting diodes using high voltages similar to the first preferred embodiment made in accordance with the present invention, wherein the two ends of each bypass switch are respectively the positive ends of their associated light-emitting diode segments. connected to the negative terminal.

FIG. 5 shows an example of how the LED controller controls the bypass switch according to the input voltage applied to the LED unit in the LED driving circuit of FIG. 4 .

FIG. 6 shows another example of how the LED controller controls the bypass switch according to the input voltage applied to the LED unit in the LED driving circuit of FIG. 4 .

FIG. 7 shows a block diagram of an apparatus for driving light-emitting diodes using high voltages, made according to a modified version of the first preferred embodiment of the invention shown in FIG. 1 .

Figure 8 shows a block diagram of an apparatus for driving light-emitting diodes using high voltages, similar to the embodiment of Figure 7, where the terminals of each bypass switch are connected to the positive and negative terminals of its associated LED segment, respectively.

FIG. 9 shows a block diagram of an apparatus for driving light-emitting diodes using high voltage according to a second preferred embodiment of the present invention.

Figure 10 shows a block diagram of an apparatus for driving light emitting diodes using high voltages, similar to the embodiment of Figure 9, where the terminals of each bypass switch are connected to the positive and negative terminals of its associated LED segment, respectively.

Among them, in the figure:

100:700:900: Universal Controller

101a:101b:201a:201b: LED unit

102a:102b:202a:202b: LED Controller

103a:103b:703b:904: Current Source

903a: 903b: Voltage Controlled Current Limiting Elements

Detailed ways

The accompanying drawings are provided in this specification so that the present invention can be further understood, and the accompanying drawings also constitute a part of this specification. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

FIG. 1 shows a block diagram of an apparatus for driving light-emitting diodes using high voltage according to a first preferred embodiment of the present invention. In this embodiment, the device includes two LED driving circuits and two switches SW1 and SW2 controlled by the general controller 100 . The LED driving circuit shown on the left side of FIG. 1 includes an LED unit 101a connected to a current source 103a. The LED driving circuit shown on the right side of FIG. 1 includes an LED unit 101b connected to the current source 103b.

The general controller 100 controls how the two switches SW1 and SW2 are turned on or off to connect the two LED driving circuits according to the input voltage V _IN . As shown in FIG. 1, the plurality of light emitting diodes in each light emitting diode unit is divided into a plurality of light emitting diode segments, each light emitting diode segment having a bypass switch associated therewith. Except for the first and last LED segments, each LED segment has a positive terminal and a negative terminal connected to the negative terminal of the LED segment preceding it and the positive terminal of the LED segment following it, respectively. In the first preferred embodiment, the current Ia of the current source 103a in the LED driving circuit shown on the left is also controlled by the general controller 100 .

As shown in Figure 1, one end of the bypass switch is connected to the negative end of the LED segment associated with it, and the other end is connected to the common node in the LED driver circuit to which it belongs, and the common node is connected to the current source 103a or 103b. The LED controller 102a or 102b controls the corresponding LED by detecting one or more node voltages or branch currents of the LED driving circuit, which is equivalent to changing the input voltage applied to the corresponding LED unit. A bypass switch in the drive circuit bypasses one or more LED segments in the corresponding LED unit.

In the present invention, the two driving circuits may comprise different or the same circuits. For example, the LED unit 101a may be the same as or different from the LED unit 101b, and the number of LED segments in the LED unit 101a may be the same or different from the number of LED segments in the LED unit 101b. The number of LEDs in the LED segment can also be the same or different from the number of LEDs in other LED segments.

According to the present invention, when the input voltage V _IN is in the range of the rectified 90V AC voltage to the rectified 140V AC voltage, such as the rectified 110V AC voltage, the switch SW1 is turned on, the switch SW2 is turned off, and the current source 103a is at the same time is also turned on, as a result of which the two LED driver circuits are connected in parallel.

When the input voltage V _IN is in the range from the rectified 180V AC voltage to the rectified 265V AC voltage, such as the rectified 220V AC voltage, the switch SW1 is turned off, and the switch SW2 is turned on, so that the light-emitting diode unit 101a emits light. The diode segments are connected in series with the LED driver circuit shown on the right side of FIG. 1 . Meanwhile, the general controller 100 controls the current Ia flowing through the current source 103a according to the voltage variation of the input voltage _VIN .

The voltage variation of the input voltage V _IN can be detected by directly sensing the input voltage V _IN , or by detecting the relevant node voltage, such as the voltage at one end of the switch SW2, or the branch current of the LED driving circuit, such as the current Ib of the current source 103b. Switch SW2 may also be a passive switch such as a diode.

According to the present invention, when the input voltage V _IN is not high enough to turn on the LED driving circuit shown on the right side of FIG. 1 , the current source 103a is turned on. However, when the input voltage V _IN is high enough to turn on the LED driving circuit shown on the right side of FIG. 1 , the current source 103 a will be turned off.

The principles and examples of operation of the generic controller 100 and current source 103a or 103b have been disclosed in detail in related US Patent Application No. 15/496,029, which is incorporated herein by reference, and the detailed description will not be repeated.

FIG. 2 shows an example of how the LED controller 102a or 102b controls the bypass switch according to the input voltage applied to the LED unit. V _{LED_IN} represents the input voltage applied to the light emitting diode cell of the bypass switch being controlled. The example shows that there are N bypass switches connected to N associated LED segments in the LED unit, respectively. As _{VLED_IN} increases, the bypass switches are turned on and off one by one in order from the bypass switch associated with the first LED segment to the bypass switch associated with the last LED segment to Increase the number of LED segments connected in series within the LED unit. When V _{LED_IN} decreases, the bypass switches are also turned on and off one by one in reverse order to reduce the number of LED segments connected in series in the LED unit.

FIG. 3 shows another example of how the LED controller 102a or 102b controls the bypass switch according to the input voltage _{VLED_IN} applied to the LED unit. In this example, all bypass switches are initially turned on, then as _{VLED_IN} rises, from the bypass switch associated with the first LED segment to the bypass switch associated with the last LED segment order, one by one, to increase the number of LED segments connected in series in the LED unit. When V _{LED_IN} falls, the bypass switches are turned on one by one in reverse order to reduce the number of LED segments connected in series in the LED unit. It should be noted that in this example, the bypass switch associated with the last LED segment should always be on.

According to the present invention, as shown in FIG. 4 , both ends of each bypass switch may also be connected to the positive and negative ends of its associated LED segment, respectively. As can be seen in Figure 4, each LED segment in LED unit 201a or 201b has an associated bypass switch connected from the positive terminal to the negative terminal of the LED segment. Thus, each LED segment can be independently and selectively controlled by the LED controller 202a or 202b.

FIG. 5 shows an example of how the LED controller 202a or 202b controls the bypass switch according to the input voltage V _{LED_IN} applied to the LED cells of the LED driver circuit shown in FIG. 4 . In this example, all bypass switches are initially turned on, then as _{VLED_IN} rises, from the bypass switch associated with the first LED segment to the bypass switch associated with the last LED segment order, one by one, to increase the number of LED segments connected in series in the LED unit. When V _{LED_IN} falls, the bypass switches are turned on one by one in reverse order to reduce the number of LED segments connected in series in the LED unit.

FIG. 6 shows another example of how the LED controller 202a or 202b controls the bypass switch according to the input voltage V _{LED_IN} applied to the LED cells of the LED driver circuit shown in FIG. 4 . In this example, there are 15 LEDs in the LED unit, and the 15 LEDs are divided into 4 LED segments. The number of LEDs in the 4 LED segments is configured as 1, 2, 4 and 8, respectively, so that the LED controller can control the associated bypass switch to turn on any number of LEDs from 1 to 15, making it connected in series in the light emitting diode unit.

As previously mentioned, each LED segment can be selectively and independently controlled in the LED driver circuit shown in FIG. 4 . In the example shown in Figure 6, the bypass switches are not turned on or off sequentially. Instead, according to the voltage value of the input voltage V _{LED_IN} applied to the light emitting diode unit, an appropriate number of light emitting diodes can be turned on, and the associated bypass switch can be turned on or off.

The table in Figure 6 shows how the 4 associated bypass switches are turned on or off depending on the value of the input voltage applied to the LED cells. It can be seen from the table that when the LED input voltage V _{LED_IN} is at the first voltage level, only the bypass switch associated with the LED segment-1 is turned off. Therefore, only one light-emitting diode in the light-emitting diode unit is conductive. When the LED input voltage V _{LED_IN} is at the 2nd voltage level, only the bypass switch associated with LED segment-2 is opened, and since LED segment-2 has only two LEDs, the There are two light emitting diodes conducting.

As shown in the table of Fig. 6, it can be seen that as the input voltage value of V _{LED_IN} increases gradually at 15 different voltage levels, due to the combination of the LED controller selectively turning on or off the bypass switch, the resultant light is emitted. The LEDs that are turned on in the diode unit are 1, 2, 3, . . . , or 15. Similarly, as V _{LED_IN} gradually decreases the input voltage value at 15 different voltage levels, due to the combination of the LED controller selectively turning on or off the bypass switch, the result is that there are 15, 14, 13, ..., or 1 LED is turned on.

FIG. 7 shows a block diagram of an apparatus for driving light-emitting diodes using high voltages according to a modified version of the first preferred embodiment of the present invention shown in FIG. 1 . In this embodiment, the device includes two LED driving circuits and two switches SW1 and SW2 controlled by the general controller 700 . The light-emitting diode driving circuit shown on the left side of FIG. 7 includes a light-emitting diode unit 101a connected to a current source 103a. The light-emitting diode driving circuit shown on the right side of FIG. 7 includes a light-emitting diode unit 101b connected to a current source 703b.

As can be seen from FIG. 7, the current source 703b has a current sensing resistor connected to ground, and the voltage value across the current sensing resistor is fed back to the general controller 700 as a current sensing signal of the general controller 700, The current source 103a is controlled by sending a current setting signal.

As shown in FIG. 7, in addition to controlling the current source 103a, the general controller 700 in this embodiment receives a current sensing signal from the current source 703b, so that the current can be determined by sensing the current Ib flowing through the current source 703b The current Ia of the source 103a. It can also be seen that each LED segment also has an associated bypass switch connected from the negative terminal of the LED segment to a common node, which in turn is connected to the current source 103a or 703b.

Similar to the first preferred embodiment shown in FIG. 1 , in this embodiment, when the input voltage V _IN is in a range from a rectified 90 VAC voltage to a rectified 140 VAC voltage, eg, a rectified 110 VAC voltage voltage, the general controller 700 controls the switch SW1 to be turned on, the switch SW2 to be turned off, and the current source 103a is also turned on. As a result, the two light-emitting diode drive circuits are connected in parallel.

When the input voltage V _IN is in the range from the rectified 180V AC voltage to the rectified 265V AC voltage, such as the rectified 220V AC voltage, the switch SW1 is turned off, and the switch SW2 is turned on, so that the light-emitting diode unit 101a emits light. The diode segments are connected in series with the LED driver circuit shown on the right side of FIG. 7 . Meanwhile, the general controller 700 controls the current Ia flowing through the current source 103a according to the current sensing signal from the current source 703b.

The principles and examples of operation of the generic controller 700 and current source 103a or 703b have been disclosed in detail in related US Patent Application No. 15/496,029, which is incorporated herein by reference, and the detailed description will not be repeated.

FIG. 8 shows a block diagram of an apparatus for driving light-emitting diodes using high voltages, similar to the modified version of the first preferred embodiment shown in FIG. 7 . However, in the present embodiment, as shown in FIG. 8 , in the two LED driving circuits of the device, the two ends of each bypass switch in the LED unit 201a or 201b are respectively connected to the LED segment associated with it. Positive and negative terminals are connected. Each LED segment can be independently and selectively controlled by the LED controller 202a or 202b.

In the modified version of the first preferred embodiment shown in Figures 7 and 8, how the bypass switch in each LED unit is controlled by its corresponding LED controller according to the input voltage V applied to the LED unit _{The LED_IN} control is similar to the first preferred embodiment shown in FIGS. 1 and 4 . The previously described principles and examples shown in FIGS. 2 and 3 and 5 and 6 also apply to this modified version of the first preferred embodiment.

FIG. 9 shows a block diagram of an apparatus for driving light-emitting diodes using high voltage according to a second preferred embodiment of the present invention. In this embodiment, the device includes two LED driving circuits and two switches SW1 and SW2 controlled by the general controller 900 . The light-emitting diode driving circuit shown on the left side of FIG. 9 includes a light-emitting diode unit 101a connected to a voltage-controlled current limiting element 903a. The light-emitting diode driving circuit shown on the right side of FIG. 9 includes a light-emitting diode unit 101b connected to a voltage-controlled current limiting element 903b. The two LED driver circuits have a common current source 904 connecting the voltage controlled current limiting elements 903a and 903b to ground.

In this embodiment, the general controller 900 controls two switches SW1 and SW2 , two voltage controlled current limiting elements 903a and 903b and a shared current source 904 . V _C1 and V _C2 are the control voltages for the two voltage controlled current limiting elements 903a and 903b.

Similar to the first preferred embodiment, in this embodiment, when the input voltage V _IN is in the range of the rectified 90 volts AC voltage to the rectified 140 volts AC voltage, eg, the rectified 110 volts AC voltage, the general controller 900 The control switch SW1 is turned on, and the switch SW2 is turned off. The two control voltages of the two voltage-controlled current limiting elements 903a and 903b are set to be the same.

When the input voltage V _IN is in the range from the rectified 180V AC voltage to the rectified 265V AC voltage, such as the rectified 220V AC voltage, the switch SW1 is turned off, and the switch SW2 is turned on, so that the light-emitting diode unit 101a emits light. The diode segments are connected in series with the LED driver circuit shown on the right side of FIG. 9 . The control voltage of the voltage-controlled current-limiting element 903b of the second LED driving circuit is set to be greater than or equal to the control voltage of the voltage-controlled current-limiting element 903a of the first LED driving circuit.

The principles and examples of operation of the universal controller 900, the two voltage-controlled current limiting elements 903a and 903b, and the current source 904 have been disclosed in detail in related US Patent Application No. 15/496,029, which is incorporated herein by reference , and the detailed description will not be repeated.

FIG. 10 shows a block diagram of an apparatus for driving light-emitting diodes using high voltage, similar to the second preferred embodiment shown in FIG. 9 . However, in the present embodiment, as shown in FIG. 10 , in the two LED driving circuits of the device, the two ends of each bypass switch in the LED unit 201a or 201b are respectively connected to the LED segment associated therewith. Positive and negative terminals are connected. Each LED segment can be independently and selectively controlled by the LED controller 202a or 202b.

In the second preferred embodiment shown in Figures 9 and 10, how the bypass switch in each LED unit is controlled by its corresponding LED controller according to the input voltage V _{LED_IN} applied to the LED unit, It is similar to the first preferred embodiment shown in FIGS. 1 and 4 . The previously described principles and examples shown in FIGS. 2 and 3 and 5 and 6 also apply to this second preferred embodiment.

Although the present invention is described above through only a few preferred embodiments, it is obvious to those skilled in the art that there are still many undescribed variations and modifications without departing from the scope of the present invention as defined below. within.

Claims (20)

1. a kind of device using the multiple light emitting diodes of high voltage drive characterized by comprising

First and second LED driving circuits, each LED driving circuit include:

One light emitting diode, wherein the multiple light-emitting diodes pipeline sections for thering are multiple light emitting diodes to be divided into series connection, packet Include the light-emitting diodes pipeline section of a leading light-emitting diodes pipeline section and a tail portion, each of the multiple light-emitting diodes pipeline section hair Optical diode section has anode and negative terminal；

Multiple by-pass switches, each by-pass switch are related to a light-emitting diodes pipeline section in the multiple light-emitting diodes pipeline section Connection, and one end is connected to the negative terminal of associated light-emitting diodes pipeline section, and the other end is connected to a common node；

One LED controller controls the multiple by-pass switch；With

One current source, the first end of the current source are connected to the common node, and the second end of the current source is connected to ground；

First switch device, the first end of the first switch device are connected to the neck of first LED driving circuit The anode of the light-emitting diodes pipeline section of head, the second end of the first switch device are connected to the second light emitting diode driving electricity The anode of the leading light-emitting diodes pipeline section on road；

Second switch device, the first end of the second switch device are connected to the tail of first LED driving circuit The negative terminal of the light-emitting diodes pipeline section in portion, the second end of the second switch device are connected to the second light emitting diode driving electricity The anode of the leading light-emitting diodes pipeline section on road；

One general purpose controller controls the first switch device and second switch device and first light emitting diode driving electricity The current source on road；With

One input voltage is connected to anode and the institute of the leading light-emitting diodes pipeline section of first LED driving circuit State general purpose controller；

Wherein when the input voltage is when 90 volts of alternating voltages of rectification are between the 140 volts of alternating voltages rectified, described the One switching means into conduction, the second switch device disconnect, and when the input voltage rectification 180 volts of alternating voltages extremely When between 265 volts of alternating voltages of rectification, the first switch device is disconnected, the second switch device conducting.

2. device as described in claim 1, which is characterized in that the second switch device is diode.

3. device as described in claim 1, which is characterized in that in each LED driving circuit, with being applied to State increasing for the input voltage of light emitting diode, the LED controller leading shines two according to from described The associated by-pass switch of pole pipe section to by-pass switch associated with the light-emitting diodes pipeline section of the tail portion sequence, one one It is a to sequentially turn on and disconnect, and with the reduction for the input voltage for being applied to the light emitting diode, according to opposite Sequentially, to the associated by-pass switch of light-emitting diodes pipeline section of the tail portion to related with the leading light-emitting diodes pipeline section The by-pass switch of connection, sequentially turns on one by one and disconnects.

4. device as described in claim 1, which is characterized in that in each LED driving circuit, the light-emitting diodes Tube controller at the beginning all turns on all by-pass switches, then as being applied to the defeated of the light emitting diode Enter increasing for voltage, according to from by-pass switch associated with the leading light-emitting diodes pipeline section to the tail portion shine The sequence of the previous associated by-pass switch of light-emitting diodes pipeline section of diode section, successively disconnects one by one, and with It is applied to the reduction of the input voltage of the light emitting diode, in a reverse order, from luminous two with the tail portion The previous associated by-pass switch of light-emitting diodes pipeline section of pole pipe section is to associated with the leading light-emitting diodes pipeline section By-pass switch sequentially turns on one by one.

5. device as described in claim 1, which is characterized in that the general purpose controller according to the variation of the input voltage, An electric current setting signal is sent to control the electric current of the current source in first LED driving circuit.

6. device as described in claim 1, which is characterized in that the current source of second LED driving circuit has One is connected to the current-sense resistor on ground, and is fed back to the general control across the voltage of the current-sense resistor Device processed makes the general purpose controller send an electric current setting signal as a current sensing signal to control described first luminous two The electric current of current source in pole pipe driving circuit.

7. a kind of device using the multiple light emitting diodes of high voltage drive characterized by comprising

First and second LED driving circuits, each LED driving circuit include:

One light emitting diode, wherein the multiple light-emitting diodes pipeline sections for thering are multiple light emitting diodes to be divided into series connection, packet Include the light-emitting diodes pipeline section of a leading light-emitting diodes pipeline section and a tail portion, each of the multiple light-emitting diodes pipeline section hair Optical diode section has anode and negative terminal；

Multiple by-pass switches, each by-pass switch are related to a light-emitting diodes pipeline section in the multiple light-emitting diodes pipeline section Connection, and one end is connected to the anode of associated light-emitting diodes pipeline section, and the other end is connected to associated light emitting diode The negative terminal of section；

One LED controller controls the multiple by-pass switch；With

One current source, the first end of the current source are connected to the negative terminal of the light-emitting diodes pipeline section of the tail portion, the current source Second end be connected to ground；

First switch device, the first end of the first switch device are connected to the neck of first LED driving circuit The anode of the light-emitting diodes pipeline section of head, the second end of the first switch device are connected to the second light emitting diode driving electricity The anode of the leading light-emitting diodes pipeline section on road；

Second switch device, the first end of the second switch device are connected to the tail of first LED driving circuit The negative terminal of the light-emitting diodes pipeline section in portion, the second end of the second switch device are connected to the second light emitting diode driving electricity The anode of the leading light-emitting diodes pipeline section on road；

One general purpose controller controls the electric current of first and second switching devices and first LED driving circuit Source；With

One input voltage is connected to anode and the institute of the leading light-emitting diodes pipeline section of first LED driving circuit State general purpose controller；

Wherein when the input voltage is when 90 volts of alternating voltages of rectification are between the 140 volts of alternating voltages rectified, described the One switching means into conduction, the second switch device disconnect, and when the input voltage rectification 180 volts of alternating voltages extremely When between 265 volts of alternating voltages of rectification, the first switch device is disconnected, the second switch device conducting.

8. device as claimed in claim 7, which is characterized in that the second switch device is diode.

9. device as claimed in claim 7, which is characterized in that described to shine in each LED driving circuit Diode control at the beginning all turns on all by-pass switches, then as being applied to the light emitting diode Input voltage increase, according to from associated with leading light-emitting diodes pipeline section by-pass switch to the tail portion The sequence of the associated by-pass switch of light-emitting diodes pipeline section, successively disconnects one by one, and be applied to it is described shine two The reduction of the input voltage of pole pipe unit, in a reverse order, from side associated with the light-emitting diodes pipeline section of the tail portion Way switch sequentially turns on one by one to by-pass switch associated with the leading light-emitting diodes pipeline section.

10. device as claimed in claim 7, which is characterized in that in each LED driving circuit, with application Input voltage to the light emitting diode increases, and the multiple by-pass switch is not successively but selectivity is led On-off is opened, so that more and more light emitting diodes be connected in series, and with being applied to the light emitting diode The reduction of input voltage, the multiple by-pass switch be not successively but selectivity be switched on or disconnect, to be connected in series Light emitting diode less and less.

11. device as claimed in claim 7, which is characterized in that the general purpose controller according to the variation of the input voltage, An electric current setting signal is sent to control the electric current of the current source in first LED driving circuit.

12. device as claimed in claim 7, which is characterized in that the current source of second LED driving circuit has There is one to be connected to the current-sense resistor on ground, and is fed back to across the voltage of the current-sense resistor described general Controller makes the general purpose controller send an electric current setting signal as a current sensing signal to control described first and shine The electric current of current source in diode drive circuit.

13. a kind of device using the multiple light emitting diodes of high voltage drive characterized by comprising

First and second LED driving circuits, each LED driving circuit include:

One light emitting diode, wherein the multiple light-emitting diodes pipeline sections for thering are multiple light emitting diodes to be divided into series connection, packet Include the light-emitting diodes pipeline section of a leading light-emitting diodes pipeline section and a tail portion, each of the multiple light-emitting diodes pipeline section hair Optical diode section has anode and negative terminal；

Multiple by-pass switches, each by-pass switch are related to a light-emitting diodes pipeline section in the multiple light-emitting diodes pipeline section Connection, and one end is connected to the negative terminal of associated light-emitting diodes pipeline section, and the other end is connected to a common node；

One LED controller controls the multiple by-pass switch；With

One voltage controls current limiting element, and there is first terminal to be connected to the common node, and Second terminal is connected to control electricity Pressure and third terminal；

First switch device, the first end of the first switch device are connected to the neck of first LED driving circuit The anode of the light-emitting diodes pipeline section of head, the second end of the first switch device are connected to the second light emitting diode driving electricity The anode of the leading light-emitting diodes pipeline section on road；

Second switch device, the first end of the second switch device are connected to the tail of first LED driving circuit The negative terminal of the light-emitting diodes pipeline section in portion, the second end of the second switch device are connected to the second light emitting diode driving electricity The anode of the leading light-emitting diodes pipeline section on road；

One current source, the first end of the current source are connected to the voltage control of first and second LED driving circuit The second end of the third terminal of current limiting element processed, the current source is connected to ground；

One general purpose controller controls first and second switching device and the current source, and provides other control electricity It presses and controls current limiting element to the voltage with first and second LED driving circuit；With

One input voltage is connected to anode and the institute of the leading light-emitting diodes pipeline section of first LED driving circuit State general purpose controller；

Wherein when the input voltage is when 90 volts of alternating voltages of rectification are between the 140 volts of alternating voltages rectified, described the One switching means into conduction, the second switch device disconnect, and two control voltages are set to identical, and work as described defeated Entering voltage when 180 volts of alternating voltages of rectification are between the 265 volts of alternating voltages rectified, the first switch device disconnects, The second switch device conducting, and the control electricity of the voltage control current limiting element of second LED driving circuit Pressure is set to be greater than or equal to the control voltage of the voltage control current limiting element of first LED driving circuit.

14. device as claimed in claim 13, which is characterized in that the second switch device is diode.

15. device as claimed in claim 13, which is characterized in that in each LED driving circuit, with applying Be added to increasing for the input voltage of the light emitting diode, the LED controller according to from it is described leading The associated by-pass switch of light-emitting diodes pipeline section to by-pass switch associated with the light-emitting diodes pipeline section of the tail portion sequence, It sequentially turns on and disconnects one by one, and with the reduction for the input voltage for being applied to the light emitting diode, according to Opposite sequence, from by-pass switch associated with the light-emitting diodes pipeline section of the tail portion to the leading light emitting diode The associated by-pass switch of section, sequentially turns on one by one and disconnects.

16. device as claimed in claim 13, which is characterized in that in each LED driving circuit, the hair Optical diode controller at the beginning all turns on all by-pass switches, then as being applied to the light emitting diode list The input voltage of member increases, according to from associated with leading light-emitting diodes pipeline section by-pass switch to the tail portion Light-emitting diodes pipeline section the previous associated by-pass switch of light-emitting diodes pipeline section sequence, successively disconnect one by one, and And with the reduction for the input voltage for being applied to the light emitting diode, in a reverse order, from the tail portion The previous associated by-pass switch of light-emitting diodes pipeline section of light-emitting diodes pipeline section to the leading light-emitting diodes pipeline section phase Associated by-pass switch, sequentially turns on one by one.

17. a kind of device using the multiple light emitting diodes of high voltage drive characterized by comprising

First and second LED driving circuits, each LED driving circuit include:

One light emitting diode, wherein the multiple light-emitting diodes pipeline sections for thering are multiple light emitting diodes to be divided into series connection, packet Include the light-emitting diodes pipeline section of a leading light-emitting diodes pipeline section and a tail portion, each of the multiple light-emitting diodes pipeline section hair Optical diode section has anode and negative terminal；

Multiple by-pass switches, each by-pass switch are related to a light-emitting diodes pipeline section in the multiple light-emitting diodes pipeline section Connection, and one end is connected to the anode of associated light-emitting diodes pipeline section, and the other end is connected to associated luminous two The negative terminal of pole pipe section；

One LED controller controls the multiple by-pass switch；With

One voltage controls current limiting element, and the negative terminal of the light-emitting diodes pipeline section of the tail portion, second end are connected to first terminal Son is connected to a control voltage and third terminal；

First switch device, the first end of the first switch device are connected to the neck of first LED driving circuit The anode of the light-emitting diodes pipeline section of head, the second end of the first switch device are connected to the second light emitting diode driving electricity The anode of the leading light-emitting diodes pipeline section on road；

Second switch device, the first end of the second switch device are connected to the tail of first LED driving circuit The negative terminal of the light-emitting diodes pipeline section in portion, the second end of the second switch device are connected to the second light emitting diode driving electricity The anode of the leading light-emitting diodes pipeline section on road；

One current source, the first end of the current source are connected to the voltage control of first and second LED driving circuit The second end of the third terminal of current limiting element processed, the current source is connected to ground；

One general purpose controller controls first and second switching device and the current source, and provides other control electricity It presses and controls current limiting element to the voltage with first and second LED driving circuit；With

One input voltage is connected to anode and the institute of the leading light-emitting diodes pipeline section of first LED driving circuit State general purpose controller；

Wherein when the input voltage is when 90 volts of alternating voltages of rectification are between the 140 volts of alternating voltages rectified, described the One switching means into conduction, the second switch device disconnect, and two control voltages are set to identical, and work as described defeated Entering voltage when 180 volts of alternating voltages of rectification are between the 265 volts of alternating voltages rectified, the first switch device disconnects, The second switch device conducting, and the control electricity of the voltage control current limiting element of second LED driving circuit Pressure is set to be greater than or equal to the control voltage of the voltage control current limiting element of first LED driving circuit.

18. device as claimed in claim 17, which is characterized in that the second switch device is diode.

19. device as claimed in claim 17, which is characterized in that in each LED driving circuit, the hair Optical diode controller at the beginning all turns on all by-pass switches, then as being applied to the light emitting diode list The input voltage of member increases, according to from associated with leading light-emitting diodes pipeline section by-pass switch to the tail portion The associated by-pass switch of light-emitting diodes pipeline section sequence, successively disconnect one by one, and be applied to it is described shine The reduction of the input voltage of diode, in a reverse order, from associated with the light-emitting diodes pipeline section of the tail portion By-pass switch sequentially turns on one by one to by-pass switch associated with the leading light-emitting diodes pipeline section.

20. device as claimed in claim 17, which is characterized in that in each LED driving circuit, with applying Be added to increasing for the input voltage of the light emitting diode, the multiple by-pass switch be not successively but the quilt of selectivity It is turned on or off, so that more and more light emitting diodes be connected in series, and with being applied to the light emitting diode Input voltage reduction, the multiple by-pass switch be not successively but selectivity be switched on or disconnect, thus the company of series connection Connect light emitting diode less and less.