WO2015051590A1

WO2015051590A1 - Drive method applied to light-emitting diode chip with same power but different voltage and current specifications

Info

Publication number: WO2015051590A1
Application number: PCT/CN2014/000807
Authority: WO
Inventors: 林铭锋
Original assignee: 东林科技股份有限公司; 林铭锋
Priority date: 2013-10-10
Filing date: 2014-08-29
Publication date: 2015-04-16
Also published as: JP2016536784A

Abstract

A drive method applied to light-emitting diode chips with same power but different voltage and current specifications comprises the following steps: setting a preset power value; providing a light-emitting diode chip matching the preset power value; acquiring a working current value required by the light-emitting diode chip when the light-emitting diode chip satisfies the preset power value; inputting a drive current to the light-emitting diode chip, and enabling a current value of the drive current to maintain the working current value. In this way, the drive method can be used to drive any light-emitting diode chip with the same rate power but a different rated voltage and rated current specification.

Description

LED chip driving method applied to different power voltage and current specifications of the same power

Technical field

The present invention relates to LED driving, and more particularly to an LED chip driving method for the same power but different voltage and current specifications.

Background technique

According to the LED lighting device, the LED chip and the driving device are provided, and the driving device is used to provide the electric energy required for the LED chip; currently, the LED chip specifications on the market are numerous, for the LED chip with the same power. The combination of rated voltage and rated current is various. Taking 28W LED chip as an example, the combination of rated voltage and rated current is 80V/350mA, 56V/500mA, 40V/700mA, etc. Therefore, in order to drive Light-emitting diode chips of various specifications and combinations, the current way is to develop an LED chip driving device for each LED chip; however, for LED lighting device manufacturers, each power LED chip is Need to manufacture a variety of drive devices, not only increase the pressure of the drive inventory, but also can not be priced, resulting in high manufacturing costs; if you can develop a light-emitting diode chip suitable for any combination of the same power but different rated voltage and rated current Driving method, when the light-emitting diode can be lowered Stock pressure actuated device chip, and reduce the manufacturing cost.

Summary of the invention

In view of this, the main object of the present invention is to provide an LED chip driving method applied to different voltage and current specifications of the same power, which can be applied to driving any LED chip of the same power but different rated voltage and rated current, and The power supplied to the LED chip is controlled to be maintained within a preset range.

The object of the present invention is achieved by the following technical solutions. The method for driving an LED chip applied to different voltage and current specifications of the same power includes the following steps: A. setting a preset power value; B. providing an LED chip matching the preset power value; C Obtaining an operating current value required when the LED chip meets the preset power value; D. supplying a driving current to the LED chip, and maintaining a current value of the driving current at the operating current value.

The object of the present invention can also be further achieved by the following technical measures.

The foregoing method for driving an LED chip of the same power with different voltage and current specifications, wherein a driving current supplied to the LED chip is provided by a driving device; the preset power value is that the driving device is intended to drive the LED chip Power; in step A, yes The preset power value is preset in the drive device.

The foregoing method for driving an LED chip of the same power with different voltage and current specifications, wherein before step A, a plurality of different power values are preset in the driving device, and in step A, One of the power values is selected as the preset power value.

The foregoing method for driving an LED chip of the same power with different voltage and current specifications, wherein the LED chip provided in the step B has a rated power between 90% and 110% of the preset power value.

The foregoing method for driving an LED chip of the same power with different voltage and current specifications, wherein in the step C, the driving current is supplied to the LED chip, and the current value of the driving current is less than the working current value. The starting current value is gradually increased, and the voltage value of the driving voltage supplied to the light emitting diode chip is detected, and the product of the voltage value of the driving voltage and the current value of the driving current is calculated until the product is equal to the preset power. When the value is set, the current value of the driving current is stopped, and the working current value is a current value of a driving current supplied to the LED chip when the product is equal to the preset power value.

The foregoing method for driving an LED chip of the same power and different voltage and current specifications, further comprising a step E after the step D, detecting that the driving power supplied to the LED chip exceeds a preset range of the preset power value And changing the current value of the driving current for the LED chip, so that the driving power for the LED chip is within the preset range of the preset power value, wherein the driving power is the driving voltage The voltage value is a product of the current value of the drive current, and the drive voltage is a voltage supplied to the light emitting diode chip.

The foregoing method for driving an LED chip of the same power with different voltage and current specifications, wherein the preset range is between 97% and 103% of the preset power value.

The foregoing method for driving an LED chip of the same power with different voltage and current specifications, wherein the LED chip driving method for applying the same power and different voltage and current specifications further comprises detecting a driving voltage for being supplied to the LED chip. When the voltage value is greater than the upper limit voltage value, the driving voltage supplied to the light emitting diode chip is limited, and the voltage value of the driving voltage is maintained at the upper limit voltage value.

The foregoing LED chip driving method for applying the same power and different voltage and current specifications, wherein the LED chip driving method applied to the same power and different voltage and current specifications further comprises detecting the driving current for being supplied to the LED chip. When the current value is greater than the upper limit current value, the drive current supplied to the light emitting diode chip is limited, and the current value of the drive current is maintained at the upper limit current value.

The foregoing method for driving an LED chip of the same power with different voltage and current specifications, wherein the driving device has an output port for electrically connecting the LED chip; before the step A is performed, a power supply device is provided, and the power supply device is provided Having an output terminal and outputting an output voltage from the output terminal; and then electrically connecting the output end of the power supply device to An output port of the driving device, and detecting a voltage value of the output voltage, wherein the value of the voltage value of the output voltage is set to the preset power value in step A; and the output is detected After the voltage value of the voltage, the electrical connection between the output of the power supply and the output of the drive is blocked.

The foregoing method for driving an LED chip of the same power and different voltage and current specifications, wherein before step A, the comparison voltage value is preset in the driving device; in step A, the output is detected. When the voltage value of the voltage is greater than or equal to the comparison voltage value, the value of the voltage value of the output voltage is set to the preset power value.

The foregoing method for driving an LED chip of the same power with different voltage and current specifications, wherein blocking the electrical connection between the output of the power supply device and the output port of the driving device is performed before step A.

The foregoing method for driving an LED chip of the same power with different voltage and current specifications, wherein blocking the electrical connection between the output end of the power supply device and the output port of the driving device is after step A and in step C Executed before.

With the above technical solution, the LED chip driving method of the present invention applied to different voltage and current specifications of the same power has at least the following advantages and beneficial effects: thereby driving through the LED chip applied to the same power and different voltage and current specifications The method can be applied to driving any LED chip with the same power but different rated voltage and rated current, and maintaining the power for the LED chip to be within a preset range, and the driving device for improving the conventional use can only be applied to a single type. The inconvenience of the specification of the LED chip.

The above description is only an overview of the technical solutions of the present invention, and the above-described and other objects, features and advantages of the present invention can be more clearly understood. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a block diagram of a driving device to which a preferred embodiment of the present invention is applied;

Figure 2 is a flow chart of a preferred embodiment of the present invention;

3 is a block diagram of a driving device to which another embodiment of the present invention is applied;

4 is a block diagram of a driving apparatus when a preset power value is set according to still another embodiment of the present invention.

[Main component symbol description]

1: Drive unit 10: Drive unit

1a: Input seat 1b: Output seat

20: Voltage detecting unit 30: Current detecting unit

40: arithmetic unit 50: control unit

60: Input unit 70: Power supply

80: LED chip 82: power supply device

822: output

The best way to achieve your invention

In order to further illustrate the technical means and efficacy of the present invention for achieving the intended purpose of the invention, a light-emitting diode chip driver applied to the same power and different voltage and current specifications according to the present invention will be described below with reference to the accompanying drawings and preferred embodiments. The specific embodiment, structure, characteristics and efficacy of the method are described in detail later.

FIG. 1 is a driving device 1 for driving an LED chip driving method according to a preferred embodiment of the present invention, including an input base 1a, an output port 1b, a driving unit 10, a voltage detecting unit 20, a current detecting unit 30, and an operation. Unit 40 and control unit 50.

The input base 1a is electrically connected to the power source 70, and the output base 1b is electrically connected to the LED chip 80. The driving unit 10 is electrically connected to the input base 1a and the output base 1b. After the LED chip 80 is electrically connected to the output base 1b, the driving unit 10 receives the power of the power supply 70 and outputs a driving voltage and a driving current. The light emitting diode chip 80. The driving unit 10 is a voltage value that can controllably change the driving voltage and a current value of the driving current. In practice, the drive unit 10 can be designed based on circuits of the PWM, half bridge, Buck, Boost, and the like.

The voltage detecting unit 20 is electrically connected to the driving unit 10 and the output port 1b for detecting the voltage value of the driving voltage of the driving unit 10 for the LED chip 80. The current detecting unit 30 is electrically connected to the driving unit 10 and the output port 1b for detecting the current value of the driving current supplied by the driving unit 10 to the LED chip 80.

The computing unit 40 is electrically connected to the voltage detecting unit 20 and the current detecting unit 30 , and the computing unit 40 is electrically connected to the driving unit 10 through the control unit 50 . The operation unit 40 calculates the voltage value and the current value measured by the voltage detecting unit 20 and the current detecting unit 30, and outputs a current control signal to the driving unit 10 through the control unit 50, thereby controlling the driving. Unit 10 changes the current value of the drive current.

Thereby, the LED chip driving method of the present invention can be performed by using the driving device 1 described above, and the driving method includes the following steps as shown in FIG. 2:

A. The preset power value is preset in the operation unit 40, and the preset power value is a power that the driving device 1 is intended to supply to the connected LED chip 80. For example, when the connected LED chip 80 is rated at 28 W, the preset power value is set to 28 W.

B. The LED chip 80 is matched with the preset power value. In this embodiment, the LED chip 80 is provided with an LED chip with the same rated power as the preset power value. For example, the following three specifications are provided. LED chip 80, 80V/350mA, 56V/500mA, 40V/700mA, rated voltage and rated current are different, but with the same rated power (28W), The rated power is the same as the preset power value set. Therefore, the LED chip 80 of any one of the specifications can be connected to the driving unit 10. In practice, the selected LED chip 80 has a rated power ranging from 90% to 110% of the preset power value. For example, when the preset power value is 28W, the selected LED chip is used. The rated power of 80 can be 25.2W ~ 30.8W.

C. Obtain the operating current value required to meet the preset power value. In this embodiment, the LED chip 80 is electrically connected to the driving unit 10, and the computing unit 40 sends a current control signal through the control unit 50 to control the driving unit 10 to output the driving unit 10 to the driving unit 10. The current value of the driving current of the LED chip 80 is gradually increased by the starting current value less than the operating current value, and the computing unit 40 detects the driving voltage through the voltage detecting unit 20 and the current detecting unit 30. The voltage value and the current value of the drive current are calculated, and the product of the voltage value of the drive voltage and the current value of the drive current (ie, the drive power applied to the LED chip 80) is calculated. It can be easily understood that the voltage value of the driving voltage of the LED chip 80 increases as the current value of the driving current supplied by the driving unit 10 increases, and thus is applied to the LED chip 80. The driving power is also increased, and the current value of the driving current is stopped when the driving power applied to the LED chip 80 reaches the preset power value, and the current value of the driving current is the predetermined power. The value of this operating current required for the value.

D. The computing unit 40 sends the current control signal through the control unit 50 to control the driving unit 10, so that the current value of the driving current is maintained at the operating current value for supplying the driving power that meets the preset power value. To the light-emitting diode chip 80, the light-emitting diode chip 80 is brought to a constant power state, in other words, the product of the voltage value of the driving voltage and the current value of the driving current at this time is maintained at the preset power value set in step A.

After the step D is performed, the step E is performed to detect whether the driving power applied to the LED chip 80 changes beyond a preset range. In the embodiment, the computing unit 40 continuously detects the voltage value of the driving voltage and the current value of the driving current supplied to the LED chip 80 through the voltage detecting unit 20 and the current detecting unit 30, and Calculating a product of the two (ie, the driving power), when the driving power exceeds a range of 97% to 103% of the preset power value (ie, ±3% of the preset power value), the operation unit 40 transmits The control unit 50 controls the driving unit 10 to increase or decrease the current value of the driving current output to the LED chip 80, and return the product to the range of 97% to 103% of the preset power value. Thereby, the driving power supplied to the light emitting diode chip 80 can be stabilized.

Through the above driving method, the driving device 1 can automatically detect the working current value required for the connected LED chip 80 to maintain the preset power value, even if the LED is replaced with a different rated voltage and rated current. The chip 80 can be applied to the driving device 1 as long as its rated power meets the preset power value.

In an embodiment, the driving method further includes: when the voltage value detected by the voltage detecting unit 20 is greater than the upper limit voltage value, the control unit 50 sends a voltage limiting signal to the driving unit 10 to limit the supply to the The voltage value of the driving voltage of the light emitting diode chip 80 is maintained at the upper limit voltage value. Similarly, the driving method further includes: when the current value detected by the current detecting unit 30 is greater than the upper limit current value, the control unit 50 sends a current limiting signal to the driving unit 10 to limit output to the LED chip. The current value of the drive current of 80 is maintained at the upper limit current value. Thereby, the driving voltage outputted by the driving unit 10 or the driving current is abnormal, and the LED chip 80 or the driving unit 10 is damaged.

In the embodiment, a plurality of different power values may be preset in the operation unit 40 before the step A is performed, and the driving device 1 further includes an input unit 60 electrically connected to the operation unit 40 (FIG. 3). For example, in step A, one of the plurality of power values is selected by the input unit 60 as the preset power value. Thereby, the drive device 1 can be adapted to drive light-emitting diode chips 80 of different power ratings. In practice, the input unit 60 can be designed based on a switch, and the user can switch the switch to set the preset power value.

In the embodiment, in addition to setting the preset power value by using the input unit 60, another method for setting the preset power value is provided below. Before the step A is performed, the method includes:

First, the comparison voltage value is built in the operation unit 40;

A power supply unit 82 is provided as shown in FIG. 4, the power supply unit 82 having an output 822 from which the output voltage is output.

The output end 822 of the power supply device 82 is electrically connected to the output port 1b of the drive device 1.

The voltage detecting unit 20 detects a voltage value that obtains an output voltage of the power supply device 82.

Therefore, in step A, when the voltage value of the output voltage detected by the voltage detecting unit 20 is greater than or equal to the comparison voltage value, the computing unit 40 detects the voltage detecting unit 20. The value of the voltage value is set to the preset power value.

In addition, after the voltage detecting unit 20 detects the voltage value of the output voltage of the power supply device 82, the output terminal 822 of the power supply device 82 is further removed from the output port 1b of the driving device 1 to The electrical connection between the power supply device 82 and the drive device 1 is blocked.

For example, the comparison voltage value built in the operation unit 40 is 30V, and the original preset power value is 40W. If the preset power value is to be set to 32W, the output of the power supply device 82 is output. The voltage is adjusted to 32V, and the power supply device 82 is electrically connected to the output port 1b of the driving device 1. At this time, the voltage detecting unit 20 measures the voltage value of the output voltage to be 32V, and the operation unit 40 It is determined that the voltage value of the output voltage is greater than the comparison voltage value (30V), so the value "32" is set to the preset power value 32W, that is, the setting of the preset power value is completed.

Next, the output end 822 of the power supply device 82 is output from the output port of the drive device 1. 1b is removed, and then the foregoing steps B to D are performed, and the working current value required for the connected LED chip 80 to maintain the preset power value is automatically detected, even if it is replaced with different rated voltage and rated current. The LED chip 80 can be applied to the driving device 1 as long as its rated power meets the preset power value.

It is worth mentioning that, as long as the output voltage of the power supply device 82 is within the voltage range that the voltage detecting unit 20 can measure, regardless of the value of the preset preset power value, the output voltage is The voltage value can be used as the value for setting the preset power value. Thus, the driving device 1 can be applied to a plurality of different rated power LED chips 80, and the driving in step C can be calculated more accurately. The driving voltage and driving current supplied to the light emitting diode chip 80 by the unit 10.

In practice, the step of blocking the electrical connection between the driving device 1 and the power supply device 82 can also be performed after step A and before step C. In other words, it can be performed after the output voltage of the power supply device 82 is detected and before the LED chip 80 is electrically connected to the output socket 1b.

The invention is applicable to the LED chip driving method with the same power and different voltage and current specifications, and the driving device can be adapted to drive any LED chip with the same rated power but different rated voltage and rated current specifications, not limited to a single rated voltage. And the current-emitting LED chip can effectively improve the inconvenience that the conventional driving device can only be used for one specification of the LED chip.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention. The skilled person can make some modifications or modifications to the equivalent embodiments by using the above-disclosed technical contents without departing from the technical scope of the present invention, but the present invention does not deviate from the technical solution of the present invention. Technical Substantials Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the technical solutions of the present invention.

Claims

An LED chip driving method applied to different voltage and current specifications of the same power, characterized in that it comprises the following steps:

A. Set the preset power value;

B. providing an LED chip that matches the preset power value;

C. obtaining an operating current value required when the LED chip meets the preset power value;

D. Supply and drive current to the LED chip, and maintain the current value of the driving current at the operating current value.
The method for driving an LED chip of the same power with different voltage and current specifications according to claim 1, wherein a driving current supplied to the LED chip is provided by a driving device; the preset power value is The driving device is scheduled to drive the power of the LED chip; in step A, the preset power value is preset in the driving device.
The method for driving an LED chip of the same power with different voltage and current specifications according to claim 2, wherein before step A, a plurality of different power values are preset in the driving device, in the step In A, one of the plurality of power values is selected as the preset power value.
The method for driving an LED chip of the same power and different voltage and current specifications according to claim 1, wherein the LED chip provided in the step B has a rated power of 90% to 110 of the preset power value. %between.
The method for driving an LED chip of the same power with different voltage and current specifications according to claim 1, wherein in the step C, the driving current is supplied to the LED chip, and the current value of the driving current is The value of the starting current is less than the starting current value, and the voltage value of the driving voltage supplied to the LED chip is detected, and the product of the voltage value of the driving voltage and the current value of the driving current is calculated. The current value of the driving current is stopped until the product is equal to the preset power value, and the working current value is a current value of a driving current supplied to the LED chip when the product is equal to the preset power value.
The method for driving an LED chip of the same power and different voltage and current specifications according to claim 1, wherein after step D, further comprising step E, detecting that the driving power supplied to the LED chip exceeds the When the preset range of the power value is preset, the current value of the driving current for the LED chip is changed, so that the driving power for the LED chip is within the preset range of the preset power value. Wherein the driving power is a product of a voltage value of the driving voltage and a current value of the driving current, and the driving voltage is a voltage for being supplied to the light emitting diode chip.
The LED chip driving method of claim 6, wherein the preset range is between 97% and 103% of the preset power value.
The method for driving an LED chip of the same power and different voltage and current specifications according to claim 1, further comprising: detecting that a voltage value of a driving voltage to be supplied to the LED chip is greater than an upper limit voltage value; Then, the driving voltage for the LED chip is limited, and the voltage value of the driving voltage is maintained at the upper voltage value.
The method for driving an LED chip of the same power and different voltage and current specifications according to claim 1 , further comprising detecting that a current value of the driving current supplied to the LED chip is greater than an upper limit current value The driving current supplied to the LED chip is limited, and the current value of the driving current is maintained at the upper limit current value.
The LED chip driving method of claim 2, wherein the driving device has an output port, and the LED chip is electrically connected; and the power is supplied before the step A is performed. Supplying the device, and the power supply device has an output end, and outputting an output voltage from the output end; and then electrically connecting the output end of the power supply device to the output port of the driving device, and detecting the output voltage a voltage value, by which the value of the voltage value of the output voltage is set to the preset power value; and after detecting the voltage value of the output voltage, blocking the output of the power supply device An electrical connection between the terminal and the output port of the drive.
The method for driving an LED chip of the same power with different voltage and current specifications according to claim 10, wherein before step A, the comparison voltage value is further set in the driving device; in step A When the detected voltage value of the output voltage is greater than or equal to the comparison voltage value, the value of the voltage value of the output voltage is set to the preset power value.
The LED chip driving method for applying the same power and different voltage and current specifications according to claim 10, wherein the electrical connection between the output end of the power supply device and the output port of the driving device is blocked. Executed before step A.
The LED chip driving method for applying the same power and different voltage and current specifications according to claim 10, wherein the electrical connection between the output end of the power supply device and the output port of the driving device is blocked. After step A and before step C.