high power led driver
An LED driver and high-power technology, applied in the field of high-power LED drivers, can solve problems such as large current, hidden safety hazards, and power supply fires.
Inactive Publication Date: 2016-08-17
SHANXI ZHAOXIN ELECTRIC POWER EQUIP
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Problems solved by technology
When a high-power LED component has a short-circuit fault, the large current generated by the short-circuit of the load is too large, which is easy to burn the converter, and in severe cases, it will cause the power supply to catch fire, causing a fire, which poses a major safety hazard
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[0020] Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further:
[0021] See figure 1 and figure 2 , the present invention relates to a high-power LED driver, and its preferred embodiment includes a boost conversion circuit 30 , a rectifier circuit 40 , a protection circuit 50 , a PWM control circuit 20 and a constant current circuit 60 .
[0022] The protection circuit 50 includes a comparator U2, a transistor Q2, a field effect transistor Q3, a voltage regulator transistor ZD1, resistors R8 to R17, a resistor R30 and capacitors C4 to C5.
[0023] The inverting terminal of the comparator U2 is connected to a DC power supply VCC through the resistor R8 and the resistor R14, and grounded through the resistor R9. The inverting terminal of the comparator U2 is also connected to the node between the resistor R8 and the resistor R14 through the capacitor C6. The non-inverting terminal of the comparator U2 is connected t...
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The invention provides a boosting converter protection circuit. The boosting converter protection circuit comprises a comparator, a standard voltage generation module, a first electronic switch, a second electronic switch, a first resistor and a current detection module, wherein a same-phase end of the comparator is connected with a direct-current power supply through the standard voltage generation module; an opposite-phase end of the comparator is connected with an output end of the second electronic switch; an output end of the comparator is connected with a control end of the first electronic switch; an input end of the first electronic switch is connected with a control end of the second electronic switch; an output end of the first electronic switch is grounded; the control end of the second electronic switch is connected with the direct-current power supply; an output end of the second electronic switch is grounded through the current detection module; the output end of the second electronic switch is connected with the control end of the second electronic switch through the first resistor; and an input end of the second electronic switch is connected with a large-power LED (Light-Emitting Diode) assembly. The boosting converter protection circuit disclosed by the invention can be used for carrying out short-circuit and over-current protection on a boosting converter. The invention further relates to a large-power LED driver.
Description
technical field [0001] The invention relates to a high-power LED driver. Background technique [0002] LED street lamps generally use high-power LED components as light sources, which are driven by LED drivers. LED drivers generally include boost converters (BOOST converters) and rectifier circuits. When a high-power LED component has a short-circuit fault, the large current generated by the short-circuit of the load is too large, which can easily burn the converter. Contents of the invention [0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a high-power LED driver, which can protect the boost converter from overcurrent. [0004] To achieve the above object, the present invention adopts the following technical solutions: [0005] A high-power LED driver is characterized in that it includes a boost conversion circuit, a rectifier circuit, a protection circuit, a PWM control circuit and a constant current circuit; the ...
Claims
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IPC IPC(8): H02H3/08H02H3/20H05B37/02
Inventor 曾维建涂道平
Owner SHANXI ZHAOXIN ELECTRIC POWER EQUIP