CN213959734U - Short-circuit protection circuit of LED illuminating lamp and LED illuminating lamp - Google Patents

Short-circuit protection circuit of LED illuminating lamp and LED illuminating lamp Download PDF

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Publication number
CN213959734U
CN213959734U CN202022351183.5U CN202022351183U CN213959734U CN 213959734 U CN213959734 U CN 213959734U CN 202022351183 U CN202022351183 U CN 202022351183U CN 213959734 U CN213959734 U CN 213959734U
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China
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circuit
resistor
electrically connected
led light
light source
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CN202022351183.5U
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Chinese (zh)
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肖俊承
王一龙
张铁镭
石从怀
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Foshan Yigeer Electronics Co ltd
Eaglerise Electric and Electronic China Co Ltd
Jian Eaglerise Electric Co Ltd
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Foshan Yigeer Electronics Co ltd
Eaglerise Electric and Electronic China Co Ltd
Jian Eaglerise Electric Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The utility model discloses a short-circuit protection circuit of an LED illuminating lamp and the LED illuminating lamp, wherein one end of an LED light source circuit is electrically connected with the anode of an external power supply; the input end of the switch circuit is electrically connected with the other end of the LED light source circuit; a PWM output pin of the singlechip is electrically connected with the control end of the switch circuit; one end of the resistor R1 is electrically connected with the output end of the switch circuit, and the other end of the resistor R1 is electrically connected with one end of the capacitor C1; one end of the resistor R2 is electrically connected with one end of the resistor R1, and the other end of the resistor R2 is electrically connected with the other end of the capacitor C1; one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected with the base electrode of the triode Q1; one end of the resistor R3 is connected with an external power supply, the other end of the resistor R3 is connected with the collector of the triode Q1, the emitter of the triode Q1 is grounded, and the collector of the triode is electrically connected with the interrupt pin of the singlechip. The utility model has the advantages of better short-circuit protection effect, and have circuit structure simply and the cost is lower.

Description

Short-circuit protection circuit of LED illuminating lamp and LED illuminating lamp
Technical Field
The utility model relates to a LED lighting circuit field especially relates to a short-circuit protection circuit and LED light of LED light.
Background
A large number of double-path color temperature dimming or RGB (red, green and blue) three-color dimming LED driving power supplies exist in the market, a plurality of MOS (metal oxide semiconductor) tubes at the secondary end are connected in a common drain electrode mode to carry out multi-path control, and the MOS tubes are frequently damaged when the output end is short-circuited. The conventional solution is to improve the shock resistance of the MOS tube, which can increase the cost of the MOS tube; or by introducing an additional operational amplifier, but the implementation circuit is complicated.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a short-circuit protection circuit and LED light of LED light to solve above-mentioned problem.
To achieve the purpose, the utility model adopts the following technical proposal:
a short-circuit protection circuit of an LED illuminating lamp comprises a single chip microcomputer, an LED light source circuit, a switch circuit and a short-circuit detection circuit;
one end of the LED light source circuit is electrically connected with the positive electrode of the external power supply; the switch circuit is provided with an input end, an output end and a control end, and the input end of the switch circuit is electrically connected with the other end of the LED light source circuit; the single chip microcomputer is provided with a PWM output pin and an interruption pin, and the PWM output pin of the single chip microcomputer is electrically connected with the control end of the switch circuit;
the short circuit detection circuit comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a triode Q1, wherein one end of the resistor R1 is electrically connected with the output end of the switch circuit, and the other end of the resistor R1 is electrically connected with one end of the capacitor C1; one end of the resistor R2 is electrically connected with one end of the resistor R1, and the other end of the resistor R2 is electrically connected with the other end of the capacitor C1; one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected with the base electrode of the triode Q1; one end of the resistor R3 is connected with an external power supply, the other end of the resistor R3 is connected with the collector of the triode Q1, the emitter of the triode Q1 is grounded, and the collector of the triode is electrically connected with the interrupt pin of the singlechip.
Preferably, the switch circuit comprises a resistor R4 and a field effect transistor Q2, one end of the resistor R4 is electrically connected with the PWM output end of the singlechip, and the other end of the resistor R4 is electrically connected with the grid electrode of the field effect transistor Q2; the drain electrode of the field effect transistor Q2 is electrically connected with the output end of the LED light source circuit, and the source electrode of the field effect transistor Q2 is electrically connected with one end of the resistor R1.
Preferably, the LED light source circuit comprises a plurality of LED light sources, and the plurality of LED light sources are sequentially connected in series.
Preferably, the number of the LED light source circuits is multiple, and the LED light source circuits are connected in parallel; the number of the switch circuits is the same as that of the LED light source circuits, and the switch circuits are respectively connected with the LED light source circuits.
Preferably, the single chip microcomputer is provided with a plurality of PWM output terminals, and each PWM output terminal of the single chip microcomputer is electrically connected to the control terminal of each switching circuit.
An LED illuminating lamp uses the short-circuit protection circuit of the LED illuminating lamp.
The utility model has the advantages that: when the short circuit takes place at LED light source circuit's both ends, carry out the short circuit through resistance R1 and triode Q1 and detect, then utilize the outside interrupt function of singlechip to realize short-circuit protection, finally avoid switch circuit to take place to damage, the utility model discloses a short-circuit protection circuit need not to improve switch circuit's shock resistance, also need not to introduce operational amplifier, therefore the cost is lower, and the structure is very simple, and short-circuit protection is effectual.
Drawings
The accompanying drawings are provided to further illustrate the present invention, but the content in the accompanying drawings does not constitute any limitation to the present invention.
FIG. 1 is a schematic circuit diagram of one embodiment of the present invention;
in the drawings: the LED light source circuit comprises an LED light source circuit 1, a switch circuit 2, a short circuit detection circuit 3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a triode Q1 and a field effect tube Q2.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
The short-circuit protection circuit of the LED lighting lamp of the present embodiment, as shown in fig. 1, includes a single chip, an LED light source circuit 1, a switch circuit 2, and a short-circuit detection circuit 3;
one end of the LED light source circuit 1 is electrically connected with the positive electrode of an external power supply; the switch circuit 2 is provided with an input end, an output end and a control end, and the input end of the switch circuit 2 is electrically connected with the other end of the LED light source circuit 1; the single chip microcomputer is provided with a PWM output pin and an interruption pin, and the PWM output pin of the single chip microcomputer is electrically connected with the control end of the switch circuit 2;
the short circuit detection circuit 3 comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a triode Q1, wherein one end of the resistor R1 is electrically connected with the output end of the switch circuit 2, and the other end of the resistor R1 is electrically connected with one end of the capacitor C1; one end of the resistor R2 is electrically connected with one end of the resistor R1, and the other end of the resistor R2 is electrically connected with the other end of the capacitor C1; one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected with the base electrode of the triode Q1; one end of the resistor R3 is connected with an external power supply, the other end of the resistor R3 is connected with the collector of the triode Q1, the emitter of the triode Q1 is grounded, and the collector of the triode is electrically connected with the interrupt pin of the singlechip.
The utility model provides a short-circuit protection circuit of LED light, when the short circuit takes place at the both ends of LED light source circuit 1, carry out the short circuit through resistance R1 and triode Q1 and detect, then utilize the outside interrupt function of singlechip to realize short-circuit protection, finally avoid switch circuit 2 to take place to damage. When the short-circuit protection circuit normally operates, a PWM output pin of the singlechip outputs pulses to enable the switch circuit 2 to be conducted, so that the LED light source circuit 1 forms a loop, the voltage at one end of the resistor R1 is lower than the conduction threshold of the triode Q1, the collector and the emitter of the triode Q1 are not conducted at the moment, and the collector of the triode Q1 is kept in a high level state; when the two ends of the LED light source circuit 1 are short-circuited, the voltage at one end of the resistor R1 is raised, when the voltage value is higher than the conduction threshold value of the triode Q1, the collector and the emitter of the triode Q1 are conducted, the voltage of the collector is pulled down immediately at the moment, the external interruption of the single chip microcomputer is triggered, and the PWM output of the single chip microcomputer is cut off immediately, so that the short-circuit protection effect is realized; the utility model discloses a short-circuit protection circuit need not to improve switching circuit 2's shock resistance, also need not to introduce operational amplifier, therefore the cost is lower, and the structure is very simple, and short-circuit protection is effectual.
Further, the switch circuit 2 comprises a resistor R4 and a field effect transistor Q2, one end of the resistor R4 is electrically connected with the PWM output end of the single chip microcomputer, and the other end of the resistor R4 is electrically connected with the grid electrode of the field effect transistor Q2; the drain of the field effect transistor Q2 is electrically connected with the output end of the LED light source circuit 1, and the source of the field effect transistor Q2 is electrically connected with one end of the resistor R1.
When the PWM output end of the singlechip outputs pulses, the drain electrode and the source electrode of the field effect transistor Q2 are conducted, and the LED light source circuit 1 forms a loop; the power-on time of the LED light source circuit 1 can be controlled through the PWM output time of the single chip microcomputer, so that the brightness of the LED light source can be controlled.
Further, the LED light source circuit 1 includes a plurality of LED light sources, and the plurality of LED light sources are sequentially connected in series.
When the LED light source circuit 1 forms a loop, each LED light source in the LED light source circuit 1 is energized to emit light.
Furthermore, a plurality of LED light source circuits 1 are provided, and the LED light source circuits 1 are connected in parallel; the number of the switch circuits 2 is the same as that of the LED light source circuits 1, and the switch circuits 2 are respectively connected to the LED light source circuits 1.
By adopting a plurality of LED light source circuits 1 and controlling the electrifying time of each LED light source circuit 1 through the switch circuit 2, the functions of color mixing temperature, RGB color mixing and the like can be realized.
Further, the single chip microcomputer is provided with a plurality of PWM output ends, and each PWM output end of the single chip microcomputer is electrically connected to the control end of each switching circuit 2.
The singlechip controls each switch circuit 2 through each PWM output end respectively to control the on-off of each LED light source circuit 1, so as to realize the functions of dimming, color temperature and color.
An LED illuminating lamp uses the short-circuit protection circuit of the LED illuminating lamp.
The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive efforts, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined in the appended claims.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (6)

1. The short-circuit protection circuit of the LED illuminating lamp is characterized in that: the LED light source circuit comprises a single chip microcomputer, an LED light source circuit, a switching circuit and a short circuit detection circuit;
one end of the LED light source circuit is electrically connected with the positive electrode of the external power supply; the switch circuit is provided with an input end, an output end and a control end, and the input end of the switch circuit is electrically connected with the other end of the LED light source circuit; the single chip microcomputer is provided with a PWM output pin and an interruption pin, and the PWM output pin of the single chip microcomputer is electrically connected with the control end of the switch circuit;
the short circuit detection circuit comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a triode Q1, wherein one end of the resistor R1 is electrically connected with the output end of the switch circuit, and the other end of the resistor R1 is electrically connected with one end of the capacitor C1; one end of the resistor R2 is electrically connected with one end of the resistor R1, and the other end of the resistor R2 is electrically connected with the other end of the capacitor C1; one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected with the base electrode of the triode Q1; one end of the resistor R3 is connected with an external power supply, the other end of the resistor R3 is connected with the collector of the triode Q1, the emitter of the triode Q1 is grounded, and the collector of the triode is electrically connected with the interrupt pin of the singlechip.
2. The short-circuit protection circuit of the LED illumination lamp according to claim 1, characterized in that: the switch circuit comprises a resistor R4 and a field effect transistor Q2, one end of the resistor R4 is electrically connected with the PWM output end of the single chip microcomputer, and the other end of the resistor R4 is electrically connected with the grid electrode of the field effect transistor Q2; the drain electrode of the field effect transistor Q2 is electrically connected with the output end of the LED light source circuit, and the source electrode of the field effect transistor Q2 is electrically connected with one end of the resistor R1.
3. The short-circuit protection circuit of the LED illumination lamp according to claim 2, characterized in that: the LED light source circuit comprises a plurality of LED light sources which are sequentially connected in series.
4. The short-circuit protection circuit of the LED illumination lamp according to claim 3, characterized in that: the LED light source circuit comprises a plurality of LED light source circuits, wherein the LED light source circuits are connected in parallel; the number of the switch circuits is the same as that of the LED light source circuits, and the switch circuits are respectively connected with the LED light source circuits.
5. The short-circuit protection circuit of the LED illumination lamp according to claim 4, characterized in that: the single chip microcomputer is provided with a plurality of PWM output ends, and each PWM output end of the single chip microcomputer is electrically connected with the control end of each switching circuit.
6. An LED illuminating lamp is characterized in that: a short-circuit protection circuit using the LED illumination lamp according to any one of claims 1 to 5.
CN202022351183.5U 2020-10-20 2020-10-20 Short-circuit protection circuit of LED illuminating lamp and LED illuminating lamp Active CN213959734U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022351183.5U CN213959734U (en) 2020-10-20 2020-10-20 Short-circuit protection circuit of LED illuminating lamp and LED illuminating lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022351183.5U CN213959734U (en) 2020-10-20 2020-10-20 Short-circuit protection circuit of LED illuminating lamp and LED illuminating lamp

Publications (1)

Publication Number Publication Date
CN213959734U true CN213959734U (en) 2021-08-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202022351183.5U Active CN213959734U (en) 2020-10-20 2020-10-20 Short-circuit protection circuit of LED illuminating lamp and LED illuminating lamp

Country Status (1)

Country Link
CN (1) CN213959734U (en)

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