Protection circuit capable of preventing series and parallel LED lamp loop disconnection
A technology of LED lamps and protection circuits, which is applied to the layout of electric lamp circuits, electric light sources, light sources, etc., can solve problems such as unresolved protection circuits, reduce the difficulty of inspection and maintenance work, meet lighting needs, and improve service life.
Inactive Publication Date: 2015-10-21
CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER +2
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Problems solved by technology
Although the patents with publication numbers of CN201363695Y, CN202857035U and CN103228076A of the National Intellectual Property Bureau provide some protection circuits for circuit disconnection of LED lamps from different aspects, they do not solve the "protection circuit for preventing circuit disconnection of series and parallel LED lamps"
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Embodiment 1）
[0012] See figure 1 , the protection circuit of this embodiment that can prevent the circuit disconnection of series and parallel LED lamps is mainly composed of a transformer T, a bridge rectifier circuit QL, a constant current drive circuit LED-D, a large group of parallel LED lamps, a voltage regulator tube DZ and The current limiting resistor R is composed.
[0013] Each large group of LED lamps includes several LED lamp groups connected in series (such as figure 1 shown in the middle dotted line box), each LED light group is composed of 2 to 5 LED lights in series; each LED light group is connected in series with a current limiting resistor R; the input end of the transformer T is connected to an external 220V AC power supply; the bridge The input terminal of the rectifier circuit QL is connected to the output terminal of the transformer T; the input terminal of the constant current drive circuit LED-D is connected to the output terminal of the bridge rectifier circuit Q...
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The invention provides a protection circuit capable of preventing series and parallel LED lamp loop disconnection. The protection circuit includes a transformer T, a bridge rectifier circuit QL, a constant current driving circuit LED-D, parallel LED lamp groups, voltage-regulator tubes DZ and current-limiting resistors R; each LED lamp group includes a plurality of LED sub-groups in series connection; a plurality of LED lamps are connected in series with one another so as to form each LED sub-group; each LED lamp group is connected in series with one current-limiting resistor R; the constant current driving circuit LED-D obtains power from the bridge rectifier circuit QL and supplies power for the LED lamp groups; and each LED sub-group is connected in parallel with one voltage-regulator tube DZ. With the protection circuit adopted, the conduction of the circuit of a while lamp group can be maintained when a certain LED lamp is open circuited, the lamp group can basically maintain constant working current and voltage, so that the service lives of the LED lamps can be prolonged, and lighting requirements in work such as check and detection of equipment such as a high-voltage cabinet and a control panel can be satisfied.
Description
technical field [0001] The invention relates to a protection circuit of an LED lamp group, in particular to a protection circuit capable of preventing circuit disconnection of series and parallel LED lamps. Background technique [0002] The lighting in the high-voltage cabinet and the lighting in the control panel of the existing substation have generally been replaced by LED lamps with energy saving, environmental protection and long service life. The lighting group in the high-voltage cabinet and the lighting group in the control panel are generally not turned on when the above-mentioned equipment is in normal operation. However, the above-mentioned lighting lamps must be turned on when the staff enters the substation to work or check the above-mentioned equipment. The above-mentioned LED lighting lamp group is formed by connecting a plurality of LED lamps in series, and multiple LED lamp groups connected in series can also be connected in parallel to a power source for u...
Claims
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IPC IPC(8): H05B37/02
Inventor 蒋越朱建敏
Owner CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER