LED (Light Emitting Diode) driving circuit

An LED driver and circuit technology, applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., can solve the problems of increasing circuit power loss and complex structure, and achieve the effect of small linear loss, small size and high reliability

Active Publication Date: 2012-10-17
HANGZHOU ZHANSHUN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention simplifies the circuit design and reduces a certain power loss by grouping LED light strings, setting different numbers of LEDs in each group, and controlling the current on and off of each group of LED light strings through parallel switches. The switch of the string is controlled by the control switch, and modules such as addition and su...

Method used

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  • LED (Light Emitting Diode) driving circuit
  • LED (Light Emitting Diode) driving circuit
  • LED (Light Emitting Diode) driving circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: A kind of LED drive circuit, the connection diagram of its circuit principle is as follows Figure 4 As shown, it includes a DC input power supply 1 and a branch circuit. The branch circuit includes a plurality of LED groups 2 formed in series by at least one LED, a bypass circuit 3 and a constant current source circuit 4. The input terminal 31 of the bypass circuit is connected to the LED The anode of the group is connected, the output terminal 32 of the bypass circuit is connected to the cathode of the LED group, a single LED group and its corresponding single bypass circuit form a unit section, and several unit sections are connected in series to form a unit section group, and the unit section group is connected in DC Between the positive terminal of the input power supply and the input terminal 41 of the constant current source circuit, the output terminal 42 of the constant current source circuit is connected with the negative terminal of the DC input ...

Embodiment 2

[0049] Embodiment 2: A kind of LED drive circuit, the circuit diagram of its bypass circuit is as follows Image 6 As shown, the bypass circuit includes a field effect transistor Q30, a diode D30 and a resistor R30, the drain of the field effect transistor Q30 is connected to the input end of the bypass circuit, the source of the field effect transistor Q30 is connected to the output end of the bypass circuit, and the diode D30 The anode of the diode D30 is connected to the control terminal of the bypass circuit, the cathode of the diode D30 is connected to the gate of the field effect transistor Q30, one end of the resistor R30 is connected to the cathode of the diode D30, and the other end of the resistor R30 is connected to the source of the field effect transistor Q30. A resistor R30 and a diode D30 are added to protect the field effect transistor Q30 and prevent the gate and source of the field effect transistor Q30 from being broken down by the reverse voltage. Other cir...

Embodiment 3

[0050] Embodiment 3: A kind of LED drive circuit, the circuit diagram of its bypass circuit is as follows Figure 7 As shown, the bypass circuit includes a field effect transistor Q30, a diode D30, a diode D31 and a resistor R30, the drain of the field effect transistor Q30 is connected to the input end of the bypass circuit, and the source of the field effect transistor Q30 is connected to the output end of the bypass circuit , the anode of the diode D30 is connected to the control terminal of the bypass circuit, the cathode of the diode D30 is connected to the gate of the field effect transistor Q30, one end of the resistor R30 is connected to the cathode of the diode D30, and the other end of the resistor R30 is connected to the source of the field effect transistor Q30, The anode of the diode D31 is connected to the drain of the field effect transistor Q30, and the cathode of the diode D31 is connected to the gate of the field effect transistor Q30. Diode D31 provides over...

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PUM

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Abstract

The invention discloses an LED (Light Emitting Diode) driving circuit, which comprises a direct-current (DC) input power supply and at least one branch. The branch is connected between the positive terminal and the negative terminal of the DC input power supply and comprises a plurality of LED groups, bypass circuits and a constant-current source circuit, wherein each LED group is formed by connecting at least one LED in series, the bypass circuits correspond to the LED groups, input terminals of the bypass circuits are connected with positive poles of the LED groups, output terminals of the bypass circuits are connected with negative poles of the LED groups, a single LED group and a single bypass circuit corresponding to the single LED group form a unit link, a unit link group is formed after a plurality of unit links are connected in series, the unit link group is connected between the positive terminal of the DC input power supply and the input terminal of the constant-current source circuit in a series, the output terminal of the constant-current source circuit is connected with the negative terminal of the DC input power supply, and a control terminal of the bypass circuits is connected with a driving terminal of the constant-current source circuit. The LED driving circuit has the advantages of little linear loss, very high reliability, very simple circuit structure, small size, and capability of being formed through partial or all integration.

Description

technical field [0001] The invention relates to the field of LED general lighting, in particular to an LED driving circuit. Background technique [0002] As a new type of light source, LED has significant advantages such as high luminous efficiency and long life. Since the LED is a current-mode device, the current flowing through the LED must be controlled during use, and it is usually driven by a constant current mode. In addition, the driving circuit should also have the advantages of high efficiency, low cost, small size, and a service life comparable to that of the LED. [0003] The simplest LED driver circuit such as figure 1 As shown, usually multiple LEDs are connected in series with a current limiting resistor, and then connected to a DC power supply or a DC power supply after the AC power supply has been rectified and filtered. The constant current effect of this circuit is very poor, and the loss of the current limiting resistor is also large. [0004] More, it ...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 苏开宇吕方玲
Owner HANGZHOU ZHANSHUN TECH
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