WO2014075341A1 - 解决恒流驱动芯片温度过高的方法及led灯条驱动电路 - Google Patents

解决恒流驱动芯片温度过高的方法及led灯条驱动电路 Download PDF

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Publication number
WO2014075341A1
WO2014075341A1 PCT/CN2012/085229 CN2012085229W WO2014075341A1 WO 2014075341 A1 WO2014075341 A1 WO 2014075341A1 CN 2012085229 W CN2012085229 W CN 2012085229W WO 2014075341 A1 WO2014075341 A1 WO 2014075341A1
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Prior art keywords
constant current
pin
led light
field effect
effect transistor
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PCT/CN2012/085229
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English (en)
French (fr)
Inventor
张华�
黎飞
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to DE112012007136.0T priority Critical patent/DE112012007136T5/de
Priority to US13/807,718 priority patent/US20140152195A1/en
Publication of WO2014075341A1 publication Critical patent/WO2014075341A1/zh
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines

Definitions

  • the present invention relates to the field of LED lamp driving, and more particularly to a method for solving the problem of excessive temperature of a constant current driving chip and an LED strip driving circuit. Background technique
  • LED Light Emitting Diode
  • the color emitted by each LED depends on the energy of the photon, and the energy of the photon is also produced. Material varies. The same material has a very close illuminating wavelength, so each LED is pure in color. The most common LEDs of general brightness are red and grass green. The LED has a small grain size and a wide variety of colors. The arrangement is very flexible in use, which is superior to the general light source. In addition, the LED has higher light efficiency and higher efficiency than other light sources. Reliability, the method of power supply is also relatively simple. LEDs are therefore particularly suitable for use as display sources.
  • the forward voltage drop of the LED does not change much with the on current, generally about 3.5V, and its illuminance increases as the current it passes increases.
  • the current is large, the light output And the illumination is also large. Therefore, the LED requires a series power supply, and is a constant current power supply.
  • the current flowing through the tube is constant to maintain a stable light output.
  • the output is required to have a constant current characteristic, and the LEDs in series are subjected to powered by.
  • the operating temperature of the chip improves the stability and reliability of the product.
  • Another object of the present invention is to provide an LED light bar driving circuit, which adopts a dual-channel constant current driving chip, which can effectively reduce the temperature of a single constant current driving chip, reduce the operating temperature of the constant current driving chip, and improve the operating temperature of the constant current driving chip. Product stability and reliability.
  • the present invention provides a method for solving an excessive temperature of a constant current driving chip, comprising the following steps:
  • Step 1 providing a plurality of constant current driving chips, wherein the constant current driving chip is a dual channel constant current driving chip, wherein each constant current driving chip has: a first input pin, a second input pin, and a first output a pin, a second output pin, and a control pin;
  • Step 2 providing a control source, a power source, and a plurality of LED strips corresponding to the number of constant current driving chips and a plurality of resistors, wherein each of the LED strips has a positive pole and a negative pole;
  • Step 3 Connect the positive pole of an LED strip to the power source, the cathode to the first input pin of a constant current driver chip, the anode of the other LED strip to the power source, and the cathode to the constant current driver chip.
  • a second input pin one end of one resistor is connected to the first output pin of the constant current driving chip, the other end is connected to the ground line, and one end of the other resistor is connected to the second output pin of the constant current driving chip.
  • Step 4. Repeat step 3 until the number of required LED strips is connected.
  • Step 5 Turn on the control source and power supply, and use the control source to control the conduction or disconnection of the corresponding LED light bar.
  • the multi-channel constant current driving chip replaces the highly integrated constant current driving chip in the prior art, and the heat dissipation loss is divided, thereby reducing the operating temperature of the constant current driving chip and improving the stability and reliability of the product.
  • Each of the constant current driving chips integrates two field effect transistors or two triodes, and the field effect transistor or the triode controls the conduction or disconnection of the corresponding LED strips, which is safe and reliable.
  • the control source outputs a high level or a low level, thereby controlling the on or off of the field effect transistor or the transistor in the constant current driving chip, the high level being greater than the voltage on the drain when the field effect transistor is turned on And greater than the threshold voltage of the field effect transistor, it can be ensured that the field effect transistor is normally turned on or off.
  • the resistance of the resistor is set according to the required brightness of the LED strip, and thus the current flowing through the LED strip can be controlled to control the brightness of the LED strip.
  • the invention also provides an LED light bar driving circuit, comprising: a power source, two LED light bars, a two-channel constant current driving chip, two resistors and a control source, wherein each LED light bar has a positive pole and a negative pole
  • the constant current driving chip has: a first input pin, a second input pin, a first output pin, a second output pin, and a control pin, wherein a positive pole of the LED strip is connected to the power a source, a cathode connected to a first input pin of a constant current driving chip, a cathode of the other LED strip being connected to a power source, and a cathode connected to a second input pin of the constant current driving chip, the resistor end Connected to the first output pin of the constant current driving chip, the other end is connected to the ground, one end of the other resistor is connected to the second output pin of the constant current driving chip, and the other end is connected to the ground, the control The pin is electrically connected to the control source.
  • the multi-channel constant current driving chip replaces the highly integrated constant current driving chip in the prior art, and the heat dissipation loss is divided, thereby reducing the operating temperature of the constant current driving chip and improving the stability and reliability of the product.
  • Each of the constant current driving chips integrates two field effect transistors or two triodes, and the field effect transistor or the triode controls the conduction or disconnection of the corresponding LED strips, which is safe and reliable.
  • the control source outputs a high level or a low level, thereby controlling the on or off of the field effect transistor or the transistor in the constant current driving chip, the high level being greater than the voltage on the drain when the field effect transistor is turned on And greater than the threshold voltage of the field effect transistor, it can be ensured that the field effect transistor is normally turned on or off.
  • the resistance of the resistor is set according to the required brightness of the LED strip, and thus can be controlled to flow through
  • LED strip current which in turn controls the brightness of the LED strip.
  • the present invention also provides a method for solving the problem of excessive temperature of a constant current driving chip, comprising the following steps:
  • Step 1 providing a plurality of constant current driving chips, wherein the constant current driving chip is a dual channel constant current driving chip, wherein each constant current driving chip has: a first input pin, a second input pin, and a first output a pin, a second output pin, and a control pin;
  • Step 2 providing a control source, a power source, and a plurality of LED strips corresponding to the number of constant current driving chips and a plurality of resistors, wherein each of the LED strips has a positive pole and a negative pole;
  • Step 3 Connect the positive pole of an LED strip to the power source, the cathode to the first input pin of a constant current driver chip, the anode of the other LED strip to the power source, and the cathode to the constant current driver chip.
  • a second input pin one end of one resistor is connected to the first output pin of the constant current driving chip, the other end is connected to the ground line, and one end of the other resistor is connected to the second output pin of the constant current driving chip.
  • Step 4. Repeat step 3 until the number of required LED strips is connected.
  • Step 5 Turn on the control source and the power source, and control the conduction or disconnection of the corresponding LED light bar by using the control source;
  • each of the constant current driving chips integrates two field effect transistors or two transistors; wherein the control source outputs a high level or a low level, thereby controlling the field effect transistor or the transistor in the constant current driving chip. Pass or cut, the high level is greater than the field effect transistor The voltage across the drain is greater than the threshold voltage of the field effect transistor;
  • the resistance of the resistor is set according to the required brightness of the LED strip.
  • the method for solving the problem that the constant current driving chip is overheated uses a plurality of dual-channel constant current driving chips to replace the 8-channel or 16-channel highly integrated constant current driving chip in the prior art to drive
  • the LED light bar reduces the operating temperature of a single constant current driving chip by reducing the number of channels of a single constant current driving chip, ensures the performance of the product, solves the heating problem caused by the high integration of the constant current driving chip, and improves the product. Stability and reliability;
  • the LED light bar driving circuit of the invention adopts a dual-channel constant current driving chip, which can effectively reduce the heat generation of a single constant current driving chip, reduce the operating temperature of the constant current driving chip, and improve the stability of the product. And reliability.
  • 1 is a schematic diagram of an 8-channel constant current driving chip connection in the prior art
  • FIG. 2 is a flow chart of a method for solving an excessive temperature of a constant current driving chip according to the present invention
  • 3 is a schematic view showing the connection of a constant current driving chip in the present invention. detailed description
  • the present invention provides a method for solving the problem of excessive temperature of a constant current driving chip, comprising the following steps:
  • Step 1 providing a plurality of constant current driving chips 30, the constant current driving chip 30 is a dual channel constant current driving chip, and each of the constant current driving chips 30 has: a first input pin 1, a second input pin 3. a first output pin 2, a second output pin 4, and a control pin 5;
  • Each of the constant current driving chips 30 integrates two field effect transistors (Q1 and Q2) or two transistors (Fig. 3 takes a field effect transistor as an example) to realize dual channel control, which is safe and reliable.
  • Step 2 providing a control source 10, a power source 40, and a plurality of LED strips 20 corresponding to the number of constant current driving chips 30 and a plurality of resistors R, each of the LED strips 20 having a positive pole and a Negative electrode
  • the resistance of the resistor R is set according to the required brightness of the LED strip 20, and the resistances of the resistors R may be the same or different. If the resistances of the plurality of resistors R are the same, the brightness of the plurality of LED strips 20 is the same. If the resistances of the resistors R are different, the brightness of the LED strips 20 is inconsistent. Can be applied to a variety of different occasions to create an atmosphere.
  • the constant current driving chip 30 further includes two voltage comparators D1 and D2.
  • the output pins of each of the voltage comparators D1/D2 are electrically connected to the field effect transistors Q1/Q2 corresponding to the voltage comparators D1/D2.
  • the gate g and the negative pin are electrically connected to the drain d of the field effect transistor Q1/Q2, and the positive pin is electrically connected to the control source 10.
  • the control source 10 outputs a high level or a low level, which is greater than a voltage on the drain d when the FET Q1/Q2 is turned on, and is greater than a threshold voltage of the field effect transistor Q1/Q2, and further It is possible to control the on or off of the field effect transistor Q1/Q2 or the transistor in the constant current driving chip 30: When the control source 10 outputs a high level, the voltage on the positive pin of the voltage comparator D1/D2 is higher than the negative pin.
  • the output pin On the upper voltage, the output pin outputs a high level, thereby controlling the corresponding field effect transistor Q1/Q2 to be turned on; when the control source 10 outputs a low level, the voltage on the positive pin of the voltage comparator D1/D2 is lower than Or equal to the voltage on the negative pin, the output pin outputs a low level, which in turn controls the corresponding FET Q1/Q2 to turn off.
  • Step 3 Connect the anode of one LED strip 20 to the power source, the cathode to the first input pin 1 of a constant current driving chip 30, the anode of the other LED strip 20 to the power source 40, and the cathode to the cathode.
  • the constant current drives the second input pin 3 of the chip 30, and one end of the resistor R is connected to the first output pin 2 of the constant current driving chip 30, and the other end is connected to the ground, and one end of the other resistor R is connected to The second output pin 4 of the constant current driving chip 30, the other end is connected to the ground, the control source 10 is connected to the control pin 5;
  • Step 4 Repeat step 3 until the number of required LED strips 20 is connected;
  • constant-current driver chip If you want to replace the 8-channel high-integration constant-current driver chip, use 4 dual-channel constant-current driver chips 30, repeat step 3 three times, you can connect 8 LED strips; if you want to replace the 16-channel high integration
  • the constant current driving chip adopts eight dual-channel constant current driving chips 30, and the steps of three and seven times are repeated, so that the connection of 16 LED light bars can be realized.
  • Step 5 Turn on the control source 10 and the power source 40, and use the control source 10 to control whether the corresponding LED strip is turned on or off.
  • the control source 10 outputs a high level or a low level to control the on or off of the field effect transistor Q1/Q2, thereby controlling the conduction or disconnection of the LED strip 20, which is safe and reliable.
  • the method can be applied to the fields of backlight driving and LED lighting of liquid crystal displays.
  • the present invention further provides an LED light bar driving circuit, comprising: a power supply 40, two LED light bars 20, a dual channel constant current driving chip 30, two resistors R and a control source 10, each of the LED lights
  • the strip 20 has a positive pole and a negative pole.
  • the constant current driving chip 30 has: a first input pin 1, a second input pin 3, a first output pin 2, a second output pin 4, and a control pin 5.
  • the anode of the LED strip 20 is connected to the power source 40, the cathode is connected to the first input pin 1 of a constant current driving chip 20, the anode of the other LED strip 20 is connected to the power source 40, and the cathode is connected to the cathode.
  • the resistor R- terminal is connected to the first output pin 1 of the constant current driving chip 30, and the other end is connected to the ground, the other resistor R One end is connected to the second output pin 4 of the constant current driving chip 30, and the other end is connected to the ground line, and the control pin 5 is electrically connected to the control source 10.
  • the dual-channel constant current driving chip 30 can be used to replace the multi-channel highly integrated constant current driving chip in the prior art, and the heat of the highly integrated constant current driving chip in the prior art can be used.
  • the loss is distributed to the plurality of dual-channel constant current driving chips 30, which reduces the operating temperature of the single constant current driving chip, and solves the heating problem caused by the high integration of the constant current driving chip in the prior art, thereby improving the stability of the product. And reliability.
  • four dual-channel constant-current driver chips 30 are used. According to the above connection, eight LED strips 20 can be connected, as shown in FIG. 3;
  • the 16-channel high-integration constant-current driving chip uses eight dual-channel constant-current driving chips 30. According to the above connection, 16 LED strips 20 can be connected.
  • Each of the constant current driving chips 30 integrates two field effect transistors (Q1 and Q2) or two transistors to realize dual channel control.
  • the control source 10 outputs a high level or a low level, thereby controlling the on or off of the field effect transistor (Q1/Q2) or the transistor in the constant current driving chip 30, the high level being greater than the field effect transistor Q1. /Q2 turns on the voltage on drain d.
  • the constant current driving chip 30 further includes two voltage comparators D1/D2, and the output pins of each of the voltage comparators D1/D2 are electrically connected to the field effect transistors Q1/Q2 corresponding to the voltage comparators D1/D2.
  • the gate g and the negative pin are electrically connected to the drain d of the field effect transistor Q1/Q2, and the positive pin is electrically connected to the control source 10.
  • the control source 10 outputs a high level or a low level, which is greater than a voltage on the drain d of the field effect transistor Q1/Q2 when it is turned on, and is greater than a threshold voltage of the field effect transistor Q1/Q2, and further It is possible to control the on or off of the field effect transistor Q1/Q2 or the transistor in the constant current driving chip 30: When the control source 10 outputs a high level, the voltage on the positive pin of the voltage comparator D1/D2 is higher than the negative pin.
  • the output pin On the voltage, the output pin outputs high power Leveling, and then controlling the corresponding field effect transistor Q1/Q2 to be turned on; when the control source 10 outputs a low level, the voltage on the positive pin of the voltage comparator D1/D2 is lower than or equal to the voltage on the negative pin, then the output The pin outputs a low level, which in turn controls the corresponding FET Q1/Q2 to turn off.
  • the resistance of the resistor R is set according to the required brightness of the LED strip 20, and the resistances of the resistors may be the same or different. If the resistances of the plurality of resistors R are the same, the brightness of the plurality of LED strips 20 is the same. If the resistances of the resistors R are different, the brightness of the LED strips 20 is inconsistent. Can be applied to a variety of different occasions to create an atmosphere.
  • the driving circuit can be applied to fields such as a backlight driving circuit of a liquid crystal display and an LED lighting circuit.
  • the present invention provides a method for solving the problem of excessive temperature of a constant current driving chip, which uses a plurality of dual-channel constant current driving chips to replace the 8-channel or 16-channel highly integrated constant current driving in the prior art.
  • the chip drives the LED strip, reduces the number of channels of the single constant current driving chip, thereby reducing the operating temperature of the single constant current driving chip, ensuring the performance of the product, and solving the heating problem caused by the high integration of the constant current driving chip.
  • the stability and reliability of the product are improved; the LED light bar driving circuit of the invention adopts a dual-channel constant current driving chip, which can effectively reduce the heat generation of a single constant current driving chip, reduce the operating temperature of the constant current driving chip, and improve the product. Stability and reliability.

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Abstract

一种解决恒流驱动芯片温度过高的方法及LED灯条驱动电路，该方法包括：步骤1、提供双通道恒流驱动芯片（30），每颗恒流驱动芯片（30）具有：第一输入引脚（1）、第二输入引脚（3）、第一输出引脚（2）、第二输出引脚（4）及控制引脚（5）；步骤2、提供LED灯条（20）、电阻（R）、控制源（10）及电源（40）；步骤3、将一LED灯条（20）的一端连接至电源（40），另一端连接至第一输入引脚（1），将另一LED灯条（20）的一端连接至电源（40），另一端连接至第二输入引脚（3），同时将一电阻（R）一端连接至第一输出引脚（2），另一端连接地线，将另一电阻（R）一端连接至第二输出引脚（4），另一端连接地线，将控制源（10）连接至控制引脚（5）；步骤4、重复步骤3，直至连接好所需LED灯条（20）的数量；步骤5、接通控制源（10）及电源（40），驱动LED灯条（20）。

Description

解决恒流驱动芯片温度过高的方法及 LED灯条驱动电路 技术领域
本发明涉及 LED 灯驱动领域， 尤其涉及一种解决恒流驱动芯片温度 过高的方法及 LED灯条驱动电路。 背景技术
发光二极管 （LED, Light Emitting Diode )是一种固态光源， 利用半 导体中的电子和空穴相结合而发出光子， 每种 LED 所发出的颜色取决于 光子的能量， 而光子的能量又因其制造材料而异。 同一种材料的发光波长 很接近， 因此每颗 LED的颜色都很纯正， 最常见的一般亮度的 LED多是 红色和草绿色。 LED 晶粒尺寸小， 颜色种类多， 使用时排列方式又有很大 的灵活， 这是它比一般光源优越的地方； 另外， LED与其他光源相比还具 有较高的光效和更高的可靠性， 供电的方法也比较简单。 因而 LED 特别 适合用作显示光源。
与一般的半导体 PN结一样， LED的正向导通压降随导通电流的变化 并不大， 一般为 3.5V 左右， 其照度是随着其通过的电流增加而增加的， 电流大， 光输出及照度也大。 所以， LED要求采用串联供电， 而且是恒流 的电源， 流经管子的电流为定值， 以保持稳定的光输出， 作为 LED 的驱 动芯片， 要求其输出具有恒流特性， 对串联的 LED进行供电。
请参阅图 1 , 为了降低成本， 目前市面上的恒流驱动芯片厂家都将控 制电流的 MOS 管 （或三极管） 集成在恒流驱动芯片内部， 形成高度集成 化的多通道内置 MOS管的 LED恒流驱动芯片。 这高度集成化的恒流驱动 芯片虽然可以简化电路结构， 但 MOS 管集成在恒流驱动芯片内部后， LED灯条上多余的电压直接作用在恒流驱动芯片的 pin脚上， 与流过 MOS 管的电流一起， 产生热损耗， 使恒流驱动芯片温度上升。 现有 8通道、 甚 至 16通道集成在一起的恒流驱动芯片， 在 LED背光驱动电路中工作时的 温度过高， 很容易超出正常使用规格， 这会影响产品的性能， 大大地降低 产品的稳定性和可靠性。 发明内容
本发明的目的在于提供一种解决恒流驱动芯片温度过高的方法， 该方 法将现有技术中的热损耗分散到多颗恒流驱动芯片上， 进而降低恒流驱动 芯片的工作温度， 提高产品的稳定性和可靠性。
本发明的另一目的在于提供一种 LED 灯条驱动电路， 该电路采用双 通道的恒流驱动芯片， 可以有效地降低单颗恒流驱动芯片的温度， 降低恒 流驱动芯片的工作温度， 提高产品的稳定性和可靠性。
为实现上述目的， 本发明提供一种解决恒流驱动芯片温度过高的方 法， 包括以下步骤：
步骤 1、 提供数颗恒流驱动芯片， 所述恒流驱动芯片为双通道恒流驱 动芯片， 所述每颗恒流驱动芯片具有： 第一输入引脚、 第二输入引脚、 第 一输出引脚、 第二输出引脚及控制引脚；
步骤 2、 提供控制源、 电源及与恒流驱动芯片数量相对应的数条 LED 灯条与数个电阻， 所述每条 LED灯条具有一正极及一负极；
步骤 3、 将一 LED灯条的正极连接至电源， 负极连接至一恒流驱动芯 片的第一输入引脚， 将另一 LED 灯条的正极连接至电源， 负极连接至该 恒流驱动芯片的第二输入引脚， 同时将一电阻一端连接至该恒流驱动芯片 的第一输出引脚， 另一端连接地线， 将另一电阻的一端连接至该恒流驱动 芯片的第二输出引脚， 另一端连接地线， 将控制源连接至控制引脚；
步骤 4、 重复步骤 3 , 直至连接好所需 LED灯条的数量；
步骤 5、 接通控制源及电源， 利用控制源控制对应 LED灯条的导通或 断开。
利用多颗双通道的恒流驱动芯片替换现有技术中高度集成化的恒流驱 动芯片， 分散热损耗， 进而降低恒流驱动芯片的工作温度， 提高产品的稳 定性和可靠性。
所述每颗恒流驱动芯片集成有两场效应晶体管或两三极管， 通过该场 效应晶体管或三极管控制对应 LED灯条的导通或断开， 安全可靠。
所述控制源输出高电平或低电平， 进而控制恒流驱动芯片中的场效应 晶体管或三极管的导通或截止， 所述高电平大于该场效应晶体管导通时漏 极上的电压， 且大于场效应晶体管的阔值电压， 可以 艮好地确保该场效应 晶体管正常导通或截止。
所述电阻的阻值根据 LED 灯条所需的亮度设定， 进而可以控制流过 LED灯条电流， 进而控制 LED灯条的发光亮度。
本发明还提供一种 LED灯条驱动电路， 包括： 电源、 两 LED灯条、 双通道恒流驱动芯片、 两电阻及控制源， 所述每一 LED 灯条具有一正极 及一负极， 所述恒流驱动芯片具有： 第一输入引脚、 第二输入引脚、 第一 输出引脚、 第二输出引脚及控制引脚， 所述一 LED 灯条的正极连接至电 源， 负极连接至一恒流驱动芯片的第一输入引脚， 所述另一 LED 灯条的 正极连接至电源， 负极连接至该恒流驱动芯片的第二输入引脚， 所述一电 阻一端连接至该恒流驱动芯片的第一输出引脚， 另一端连接地线， 所述另 一电阻的一端连接至该恒流驱动芯片的第二输出引脚， 另一端连接地线， 所述控制引脚电性连接至控制源。
利用多颗双通道的恒流驱动芯片替换现有技术中高度集成化的恒流驱 动芯片， 分散热损耗， 进而降低恒流驱动芯片的工作温度， 提高产品的稳 定性和可靠性。
所述每颗恒流驱动芯片集成有两场效应晶体管或两三极管， 通过该场 效应晶体管或三极管控制对应 LED灯条的导通或断开， 安全可靠。
所述控制源输出高电平或低电平， 进而控制恒流驱动芯片中的场效应 晶体管或三极管的导通或截止， 所述高电平大于该场效应晶体管导通时漏 极上的电压， 且大于场效应晶体管的阔值电压， 可以 艮好地确保该场效应 晶体管正常导通或截止。
所述电阻的阻值根据 LED 灯条所需的亮度设定， 进而可以控制流过
LED灯条电流， 进而控制 LED灯条的发光亮度。
本发明还提供一种解决恒流驱动芯片温度过高的方法， 包括以下步 骤：
步骤 1、 提供数颗恒流驱动芯片， 所述恒流驱动芯片为双通道恒流驱 动芯片， 所述每颗恒流驱动芯片具有： 第一输入引脚、 第二输入引脚、 第 一输出引脚、 第二输出引脚及控制引脚；
步骤 2、 提供控制源、 电源及与恒流驱动芯片数量相对应的数条 LED 灯条与数个电阻， 所述每条 LED灯条具有一正极及一负极；
步骤 3、 将一 LED灯条的正极连接至电源， 负极连接至一恒流驱动芯 片的第一输入引脚， 将另一 LED 灯条的正极连接至电源， 负极连接至该 恒流驱动芯片的第二输入引脚， 同时将一电阻一端连接至该恒流驱动芯片 的第一输出引脚， 另一端连接地线， 将另一电阻的一端连接至该恒流驱动 芯片的第二输出引脚， 另一端连接地线， 将控制源连接至控制引脚；
步骤 4、 重复步骤 3 , 直至连接好所需 LED灯条的数量；
步骤 5、 接通控制源及电源， 利用控制源控制对应 LED灯条的导通或 断开；
其中， 所述每颗恒流驱动芯片集成有两场效应晶体管或两三极管； 其中， 所述控制源输出高电平或低电平， 进而控制恒流驱动芯片中的 场效应晶体管或三极管的导通或截止， 所述高电平大于该场效应晶体管导 通时漏极上的电压， 且大于场效应晶体管的阔值电压；
其中， 所述电阻的阻值根据 LED灯条所需的亮度设定。
本发明的有益效果： 本发明解决恒流驱动芯片温度过高的方法采用多 颗双通道的恒流驱动芯片来替换现有技术中的 8通道或 16通道的高度集 成化恒流驱动芯片来驱动 LED 灯条， 通过减少单颗恒流驱动芯片的通道 数量， 进而降低单颗恒流驱动芯片的工作温度， 确保产品的性能， 解决恒 流驱动芯片高度集成化带来的发热问题， 提高产品的稳定性和可靠性； 本 发明 LED 灯条驱动电路采用双通道的恒流驱动芯片， 可以有效地降低单 颗恒流驱动芯片的发热量， 降低恒流驱动芯片的工作温度， 提高产品的稳 定性和可靠性。
为了能更进一步了解本发明的特征以及技术内容， 请参阅以下有关本 发明的详细说明与附图， 然而附图仅提供参考与说明用， 并非用来对本发 明加以限制。 附图说明
下面结合附图， 通过对本发明的具体实施方式详细描述， 将使本发明 的技术方案及其它有益效果显而易见。
附图中，
图 1为现有技术书中 8通道的恒流驱动芯片连接示意图；
图 2为本发明解决恒流驱动芯片温度过高的方法的流程图；
图 3为本发明中恒流驱动芯片的连接示意图。 具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果， 以下结合本发明 的优选实施例及其附图进行详细描述。
请参阅图 2 及 3 , 本发明提供一种解决恒流驱动芯片温度过高的方 法， 包括以下步骤：
步骤 1、 提供数颗恒流驱动芯片 30, 所述恒流驱动芯片 30 为双通道 恒流驱动芯片， 所述每颗恒流驱动芯片 30具有： 第一输入引脚 1、 第二输 入引脚 3、 第一输出引脚 2、 第二输出引脚 4及控制引脚 5;
所述每颗恒流驱动芯片 30 集成有两场效应晶体管 （Q1 和 Q2 )或两 三极管 （图 3以场效应晶体管为例） ， 进而实现双通道控制， 安全可靠。
步骤 2、 提供控制源 10、 电源 40及与恒流驱动芯片 30数量相对应的 数条 LED灯条 20与数个电阻 R, 所述每条 LED灯条 20具有一正极及一 负极；
所述电阻 R的阻值根据 LED灯条 20所需的亮度设定， 而且该几个电 阻 R的阻值可以相同， 也可以不同。 若该几个电阻 R的阻值相同， 则该数 条 LED灯条 20的发光亮度一样， 若该几个电阻 R的阻值不相同， 则该数 条 LED灯条 20的发光亮度不一致， 从而可以应用于各种不同的场合， 营 造氛围。
所述恒流驱动芯片 30还包括两电压比较器 D1和 D2, 每一电压比较 器 D1/D2 的输出引脚电性连接至与该电压比较器 D1/D2对应的场效应晶 体管 Q1/Q2 的栅极 g, 负引脚与该场效应晶体管 Q1/Q2 的漏极 d电性连 接， 正引脚用于与控制源 10电性连接。 所述控制源 10输出高电平或低电 平， 该高电平大于该场效应管 Q1/Q2导通时漏极 d上的电压， 且大于场效 应晶体管 Q1/Q2的阔值电压， 进而可以控制恒流驱动芯片 30 中的场效应 晶体管 Q1/Q2或三极管的导通或截止： 当控制源 10输出高电平时， 电压 比较器 D1/D2的正引脚上的电压高于负引脚上的电压， 则输出引脚输出高 电平， 进而控制对应的场效应晶体管 Q1/Q2导通； 当控制源 10输出低电 平时， 电压比较器 D1/D2的正引脚上的电压低于或等于负引脚上的电压， 则输出引脚输出低电平， 进而控制对应的场效应晶体管 Q1/Q2截止。
步骤 3、 将一 LED灯条 20的正极连接至电源， 负极连接至一恒流驱 动芯片 30 的第一输入引脚 1 , 将另一 LED 灯条 20 的正极连接至电源 40, 负极连接至该恒流驱动芯片 30 的第二输入引脚 3 , 同时将一电阻 R 一端连接至该恒流驱动芯片 30的第一输出引脚 2, 另一端连接地线， 将另 一电阻 R的一端连接至该恒流驱动芯片 30 的第二输出引脚 4, 另一端连 接地线， 将控制源 10连接至控制引脚 5;
步骤 4、 重复步骤 3 , 直至连接好所需 LED灯条 20的数量；
如要替换 8通道的高集成化恒流驱动芯片， 采用 4块双通道恒流驱动 芯片 30, 重复步骤 3三次， 则可实现 8条 LED灯条的连接； 如要替换 16 通道的高集成化恒流驱动芯片， 采用 8块双通道恒流驱动芯片 30, 重复步 骤 3七次， 则可实现 16条 LED灯条的连接。
步骤 5、 接通控制源 10及电源 40, 利用控制源 10控制对应 LED灯 条的导通或断开。
利用控制源 10输出高电平或低电平控制场效应晶体管 Q1/Q2的导通 或截止， 进而控制 LED灯条 20的导通或断开， 安全可靠。
把现有技术中的高度集成化的恒流驱动芯片的热损耗分散到多颗双通 道恒流驱动芯片 30上， 降低单颗恒流驱动芯片 30的工作温度， 解决了现 有技术中恒流驱动芯片高度集成化带来的发热问题， 提高了产品的稳定性 和可靠性。
该方法可以应用于液晶显示器的背光驱动及 LED照明等领域。
请参阅图 3 , 本发明还提供一种 LED 灯条驱动电路， 包括： 电源 40、 两 LED灯条 20、 双通道恒流驱动芯片 30、 两电阻 R及控制源 10, 所 述每一 LED灯条 20具有一正极及一负极， 所述恒流驱动芯片 30具有： 第一输入引脚 1、 第二输入引脚 3、 第一输出引脚 2、 第二输出引脚 4及控 制引脚 5 , 所述一 LED灯条 20的正极连接至电源 40, 负极连接至一恒流 驱动芯片 20的第一输入引脚 1 , 所述另一 LED灯条 20的正极连接至电源 40, 负极连接至该恒流驱动芯片 20的第二输入引脚 3 , 所述一电阻 R— 端连接至该恒流驱动芯片 30的第一输出引脚 1 , 另一端连接地线， 所述另 一电阻 R的一端连接至该恒流驱动芯片 30 的第二输出引脚 4, 另一端连 接地线， 所述控制引脚 5电性连接至控制源 10。
通过应用本发明 LED 灯条驱动电路， 可以采用双通道恒流驱动芯片 30替换现有技术中多通道高度集成化恒流驱动芯片， 把现有技术中的高集 成化的恒流驱动芯片的热损耗分散到多颗双通道恒流驱动芯片 30 上， 降 低单颗恒流驱动芯片的工作温度， 解决了现有技术中恒流驱动芯片高度集 成化带来的发热问题， 提高了产品的稳定性和可靠性。 如要替换 8通道的 高集成化恒流驱动芯片， 采用 4 块双通道恒流驱动芯片 30, 按照上述连 接， 则可实现 8条 LED灯条 20的连接， 如图 3所示； 如要替换 16通道 的高集成化恒流驱动芯片， 采用 8块双通道恒流驱动芯片 30, 按照上述连 接， 则可实现 16条 LED灯条 20的连接。
所述每颗恒流驱动芯片 30 集成有两场效应晶体管 （Q1 和 Q2 )或两 三极管， 进而实现双通道控制。 所述控制源 10 输出高电平或低电平， 进 而控制恒流驱动芯片 30中的场效应晶体管 （Q1/Q2 )或三极管的导通或截 止， 所述高电平大于该场效应晶体管 Q1/Q2导通时漏极 d上的电压。
所述恒流驱动芯片 30还包括两电压比较器 D1/D2, 每一电压比较器 D1/D2的输出引脚电性连接至与该电压比较器 D1/D2对应的场效应晶体管 Q1/Q2的栅极 g, 负引脚与该场效应晶体管 Q1/Q2的漏极 d电性连接， 正 引脚用于与控制源 10电性连接。 所述控制源 10输出高电平或低电平， 该 高电平大于该场效应晶体管 Q1/Q2导通时漏极 d上的电压， 且大于场效应 晶体管 Q1/Q2的阔值电压， 进而可以控制恒流驱动芯片 30 中的场效应晶 体管 Q1/Q2或三极管的导通或截止： 当控制源 10输出高电平时， 电压比 较器 D1/D2的正引脚上的电压高于负引脚上的电压， 则输出引脚输出高电 平， 进而控制对应的场效应晶体管 Q1/Q2导通； 当控制源 10输出低电平 时， 电压比较器 D1/D2的正引脚上的电压低于或等于负引脚上的电压， 则 输出引脚输出低电平， 进而控制对应的场效应晶体管 Q1/Q2截止。
所述电阻 R的阻值根据 LED灯条 20所需的亮度设定， 而且该几个电 阻的阻值可以相同， 也可以不同。 若该几个电阻 R的阻值相同， 则该数条 LED灯条 20的发光亮度一样， 若该几个电阻 R的阻值不相同， 则该数条 LED灯条 20 的发光亮度不一致， 从而可以应用于各种不同的场合， 营造 氛围。
该驱动电路可以应用于液晶显示器的背光驱动电路及 LED 照明电路 等领域。
综上所述， 本发明提供一种解决恒流驱动芯片温度过高的方法， 采用 多颗双通道的恒流驱动芯片来替换现有技术中的 8通道或 16通道的高度 集成化恒流驱动芯片来驱动 LED 灯条， 通过减少单颗恒流驱动芯片的通 道数量， 进而降低单颗恒流驱动芯片的工作温度， 确保产品的性能， 解决 恒流驱动芯片高度集成化带来的发热问题， 提高产品的稳定性和可靠性； 本发明 LED 灯条驱动电路采用双通道的恒流驱动芯片， 可以有效地降低 单颗恒流驱动芯片的发热量， 降低恒流驱动芯片的工作温度， 提高产品的 稳定性和可靠性。
以上所述， 对于本领域的普通技术人员来说， 可以根据本发明的技术 方案和技术构思作出其他各种相应的改变和变形， 而所有这些改变和变形 都应属于本发明权利要求的保护范围。

Claims

权 利 要 求
1、 一种解决恒流驱动芯片温度过高的方法， 包括以下步骤： 步骤 1、 提供数颗恒流驱动芯片， 所述恒流驱动芯片为双通道恒流驱 动芯片， 所述每颗恒流驱动芯片具有： 第一输入引脚、 第二输入引脚、 第 一输出引脚、 第二输出引脚及控制引脚；
步骤 2、 提供控制源、 电源及与恒流驱动芯片数量相对应的数条 LED 灯条与数个电阻， 所述每条 LED灯条具有一正极及一负极；
步骤 3、 将一 LED灯条的正极连接至电源， 负极连接至一恒流驱动芯 片的第一输入引脚， 将另一 LED 灯条的正极连接至电源， 负极连接至该 恒流驱动芯片的第二输入引脚， 同时将一电阻一端连接至该恒流驱动芯片 的第一输出引脚， 另一端连接地线， 将另一电阻的一端连接至该恒流驱动 芯片的第二输出引脚， 另一端连接地线， 将控制源连接至控制引脚；
步骤 4、 重复步骤 3 , 直至连接好所需 LED灯条的数量；
步骤 5、 接通控制源及电源， 利用控制源控制对应 LED灯条的导通或 断开。
2、 如权利要求 1 所述的解决恒流驱动芯片温度过高的方法， 其中， 所述每颗恒流驱动芯片集成有两场效应晶体管或两三极管。
3、 如权利要求 2 所述的解决恒流驱动芯片温度过高的方法， 其中， 所述控制源输出高电平或低电平， 进而控制恒流驱动芯片中的场效应晶体 管或三极管的导通或截止， 所述高电平大于该场效应晶体管导通时漏极上 的电压， 且大于场效应晶体管的阔值电压。
4、 如权利要求 1 所述的解决恒流驱动芯片温度过高的方法， 其中， 所述电阻的阻值根据 LED灯条所需的亮度设定。
5、 一种 LED灯条驱动电路， 包括： 电源、 两 LED灯条、 双通道恒流 驱动芯片、 两电阻及控制源， 所述每一 LED 灯条具有一正极及一负极， 所述恒流驱动芯片具有： 第一输入引脚、 第二输入引脚、 第一输出引脚、 第二输出引脚及控制引脚， 所述一 LED 灯条的正极连接至电源， 负极连 接至一恒流驱动芯片的第一输入引脚， 所述另一 LED 灯条的正极连接至 电源， 负极连接至该恒流驱动芯片的第二输入引脚， 所述一电阻一端连接 至该恒流驱动芯片的第一输出引脚， 另一端连接地线， 所述另一电阻的一 端连接至该恒流驱动芯片的第二输出引脚， 另一端连接地线， 所述控制引 脚电性连接至控制源。
6、 如权利要求 5所述的 LED灯条驱动电路， 其中， 所述每颗恒流驱 动芯片集成有两场效应晶体管或两三极管。
7、 如权利要求 6所述的 LED灯条驱动电路， 其中， 所述控制源输出 高电平或低电平， 进而控制恒流驱动芯片中的场效应晶体管或三极管的导 通或截止， 所述高电平大于该场效应晶体管导通时漏极上的电压， 且大于 场效应晶体管的阔值电压。
8、 如权利要求 5所述的 LED灯条驱动电路， 其中， 所述电阻的阻值 根据 LED灯条所需的亮度设定。
9、 一种解决恒流驱动芯片温度过高的方法， 包括以下步骤： 步骤 1、 提供数颗恒流驱动芯片， 所述恒流驱动芯片为双通道恒流驱 动芯片， 所述每颗恒流驱动芯片具有： 第一输入引脚、 第二输入引脚、 第 一输出引脚、 第二输出引脚及控制引脚；
步骤 2、 提供控制源、 电源及与恒流驱动芯片数量相对应的数条 LED 灯条与数个电阻， 所述每条 LED灯条具有一正极及一负极；
步骤 3、 将一 LED灯条的正极连接至电源， 负极连接至一恒流驱动芯 片的第一输入引脚， 将另一 LED 灯条的正极连接至电源， 负极连接至该 恒流驱动芯片的第二输入引脚， 同时将一电阻一端连接至该恒流驱动芯片 的第一输出引脚， 另一端连接地线， 将另一电阻的一端连接至该恒流驱动 芯片的第二输出引脚， 另一端连接地线， 将控制源连接至控制引脚；
步骤 4、 重复步骤 3 , 直至连接好所需 LED灯条的数量；
步骤 5、 接通控制源及电源， 利用控制源控制对应 LED灯条的导通或 断开；
其中， 所述每颗恒流驱动芯片集成有两场效应晶体管或两三极管； 其中， 所述控制源输出高电平或低电平， 进而控制恒流驱动芯片中的 场效应晶体管或三极管的导通或截止， 所述高电平大于该场效应晶体管导 通时漏极上的电压， 且大于场效应晶体管的阔值电压；
其中， 所述电阻的阻值根据 LED灯条所需的亮度设定。
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