Protection circuit for low-ripple LED control device
A technology for protecting circuits and control devices, applied to lighting devices, electric light sources, electrical components, etc., can solve problems such as short failure period, MOSFET overheating or static electricity, poor contact, etc., achieve simple circuit, improve circuit reliability, and reduce circuit cost low effect
Pending Publication Date: 2018-12-07
JIANGSU LVSUNNY VISION TECH CO LTD
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Problems solved by technology
However, due to the long-term operation of the MOSFET in the amplification region and the critical conduction state, it has a large current, and it is easily affected by external factors. Overcurrent, overvoltage or overheating will cause MOSFET failure in an instant, especially when the independent LED driver is charged with no load or Poor load contact or short circuit or MOSFET overheating or static electricity, etc., the incidence of failure is extremely high, and the failure period is short
Method used
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Embodiment Construction
[0017] Below in conjunction with accompanying drawing, illustrate the specific implementation manner of this embodiment
[0018] figure 1 It is a schematic diagram of the circuit structure of the present invention. like figure 1 As shown, the protection circuit of the low-ripple LED control device of the present invention includes a power supply circuit for supplying power to the LED control device, a ripple and flicker-removing circuit and a protection circuit.
[0019] An external voltage source is input to the input terminal of the power supply circuit. The first output terminal of the power supply circuit is used as the positive output terminal of the LED control device, and is connected to the positive pole of the LED light string. The second output end of the power supply circuit is used as a power supply end of the ripple and flicker removal circuit.
[0020] In this embodiment, the power supply circuit is a single-stage primary side constant current control circuit...
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The invention relates to a protection circuit for a low-ripple LED control device. The protection circuit comprises a de-ripple de-stroboflash circuit and a protection circuit unit. The de-ripple de-stroboflash circuit includes a control chip and a first field-effect transistor; a grid voltage output port of the control chip t is connected to a grid electrode of the first field-effect transistor;a current sensing input port of the control chip is connected to a first pole of the first field-effect transistor; an LED voltage limiting port of the control chip is connected to a second pole of the first field-effect transistor; and the second pole of the first field-effect transistor serves as a negative output terminal of the LED control device. The protection circuit unit is a diode seriescircuit; and the two ends of the diode series circuit are connected in parallel between the first pole and the second pole of the first field-effect transistor. Therefore, the power MOSFET is protected from failing to work, so that the circuit reliability is improved.
Description
technical field [0001] The invention relates to an LED control device, in particular to a protection circuit of a low-ripple LED control device. Background technique [0002] With the rapid development of LED lighting, the cost requirements for LED drivers are getting lower and lower, and the cost of LED drivers depends on the selection of LED driving solutions. At present, the most widely used LED driving scheme at home and abroad is the single-stage PFC circuit scheme, which is the single-stage primary side constant current control PSR+power factor correction control PFC. This scheme has the characteristics of simple circuit, high constant current precision and low cost. However, one disadvantage of the single-stage PFC+PSR solution is that the LED has a stroboscopic flicker, that is, there is a fixed frequency flicker when taking pictures with a camera. In order to make up for the stroboscopic shortcomings of this scheme, there is an application of adding a ripple and st...
Claims
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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/50Y02B20/30
Inventor 扬东建吕飞瑶
Owner JIANGSU LVSUNNY VISION TECH CO LTD