A led constant voltage power supply with self-locking protection circuit
A technology of self-locking protection and constant voltage power supply, which is applied in the field of LED lighting, can solve problems such as damage to LED lamps and cannot be protected immediately, and achieve high safety performance
Inactive Publication Date: 2019-03-01
珠海绿金能控科技有限公司
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- Application Information
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Problems solved by technology
In particular, the existing LED power supply cannot be protected immediately when it is overvoltage or overcurrent, resulting in damage to the LED lamps
Method used
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Embodiment 1
[0013] Such as figure 1 , The LED constant voltage power supply with a self-locking protection circuit in this embodiment includes a power conversion circuit, a power chip, a current detection circuit, a first comparison circuit, a second comparison circuit, and a self-locking circuit.
[0014] The current detection circuit is used to detect the current flowing through the load LED, and its two ends are connected to the two voltage input terminals of the second comparison circuit, the input terminal of the first comparison circuit is connected to the input terminal of the current detection circuit; the input terminal of the second comparison circuit The output terminal is connected to the input terminal of the self-locking circuit, and the output terminal of the self-locking circuit is connected to the closing pin of the power supply chip.
[0015] Such as figure 2 , The current detection circuit is composed of resistor RS1, which is used to detect the current flowing throug...
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The invention provides an LED constant-voltage power supply with a self-locking protecting circuit. The LED constant-voltage power supply comprises a power conversion circuit, load, a voltage detection comparing circuit, a comparing circuit and a self-locking circuit; the power conversion circuit comprises a power chip and a current detecting circuit and used for converting 220V AC into constant voltage DC; the output end of the power conversion circuit is connected with the load; the current detecting circuit is used for detecting current flowing through the load; two ends of the current detecting circuit are respectively connected to two input ends of the comparing circuit; the comparing circuit is used for comparing voltage of two ends of the current detecting circuit; if the input voltage of the load is less than the voltage at the other end of the current detecting circuit, a control signal can be outputted to the self-locking circuit; the voltage detection comparing circuit is used for detecting the voltage of the end without being connected in series with the load, of the current detecting circuit; if the detecting voltage exceeds the set value, the control signal can be outputted to the self-locking circuit; the self-locking circuit is used for controlling the output of the power chip according to the outputs of the comparing circuit and the voltage detection comparing circuit.
Description
【Technical field】 [0001] The invention relates to the technical field of LED lighting, in particular to an LED constant voltage power supply with protection function. 【Background technique】 [0002] LED has been more and more widely used in the field of lighting because of its advantages of environmental protection, high efficiency and energy saving, and long life. A stable, reliable and efficient LED power supply is the basis for realizing high efficiency, energy saving, safety and reliability of LED lamps. In particular, the existing LED power supply cannot be immediately protected during overvoltage and overcurrent, causing damage to the LED lamp. 【Content of invention】 [0003] In view of this, the present invention provides a LED constant-voltage power supply with a protection function, which can overcome the defects of the LED constant-voltage power supply in the prior art. [0004] The present invention adopts the following technical scheme to construct an LED con...
Claims
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IPC IPC(8): H02H3/08H02H3/20H02H3/06H05B37/02
Inventor 张言彬
Owner 珠海绿金能控科技有限公司