CN219761391U - LED dimming power supply with short circuit detection function - Google Patents
LED dimming power supply with short circuit detection function Download PDFInfo
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- CN219761391U CN219761391U CN202320958119.4U CN202320958119U CN219761391U CN 219761391 U CN219761391 U CN 219761391U CN 202320958119 U CN202320958119 U CN 202320958119U CN 219761391 U CN219761391 U CN 219761391U
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Abstract
The utility model discloses an LED dimming power supply with a short circuit detection function, which comprises a power supply main circuit, a control circuit, a driving circuit, a PNP triode Q2, a resistor R4-7 and a capacitor C1, wherein the structure can ensure that after the power supply is electrified, if the short circuit phenomenon occurs at the two ends of a lamp, the potential difference between an LED+ terminal and an LED-terminal is 0, the PNP triode Q2 is cut off, the control circuit detects a short circuit signal through the resistor R7, and the control circuit prohibits outputting the driving signal, thereby protecting the dimming power supply.
Description
Technical Field
The utility model relates to the technical field of dimming, in particular to an LED dimming power supply with a short circuit detection function.
Background
With the rapid development of the LED illumination industry, the LED lamps are used by household users, and even the outdoor illumination uses the LED lamps, so that the LED power supply market is developed vigorously, and the requirements on the LED power supply are higher and higher; at present, the LED dimming power supply is widely applied to the market, the output of the dimming power supply is influenced by external factors in the use process, the dimming power supply is easily damaged once the short-circuit abnormality occurs, particularly the power supply is more easily damaged when the short-circuit abnormality occurs, and the short-circuit protection method in the existing LED dimming power supply is to turn off a driving signal when detecting that the dimming power supply has the short-circuit abnormality, so that the dimming power supply is protected, however, the internal devices of the dimming power supply are impacted by peak high current generated by short-circuit, and the service life of the devices is shortened; it is therefore necessary to develop an LED dimming power supply with short circuit detection.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides an LED dimming power supply with a short circuit detection function.
The technical scheme adopted by the embodiment of the utility model for solving the technical problems is as follows: the utility model provides a LED dimming power supply with short circuit detection function, including power supply main circuit, control circuit, drive circuit, PNP triode Q2, resistance R4-7 and electric capacity C1, power supply main circuit's input is connected with external power supply, power supply main circuit has VCC end, the VDD end, GNS end, LED+ terminal and LED-terminal, PNP triode Q2's projecting pole is connected with power supply main circuit's LED+ terminal and one end of load, PNP triode Q2's base is connected with resistance R6's one end respectively through resistance R4, power supply main circuit's LED-terminal and the other end of load, PNP triode Q2's collecting electrode is connected with resistance R7's one end, electric capacity C1's one end and control circuit respectively through resistance R5, resistance R6's the other end and electric capacity C1's the other end are connected with power supply main circuit's GNS end, control circuit's power supply end is connected with power supply main circuit's the end, drive circuit's power supply end is connected with power supply main circuit's end, control circuit's output is connected with power supply main circuit's LED-terminal through drive circuit.
Preferably, the driving circuit comprises a driving chip U2, a resistor R1-3 and a MOS tube Q1, one end of the resistor R2 and a power end of the driving chip U2 are connected with a VDD end of the power supply main circuit, the other end of the resistor R2 is connected with a first input end of the driving chip U2 and a GNS end of the power supply main circuit through the resistor R3, a second input end of the driving chip U2 is connected with an output end of the control circuit, a grounding end of the driving chip U2 is connected with the GNS end of the power supply main circuit, an output end of the driving chip U2 is connected with a grid electrode of the MOS tube Q1 through the resistor R1, a source electrode of the MOS tube Q1 is connected with the GNS end of the power supply main circuit, and a drain electrode of the MOS tube Q1 is connected with an LED-terminal of the power supply main circuit.
The utility model has the beneficial effects that: the LED dimming power supply with the short circuit detection function comprises a power supply main circuit, a control circuit, a driving circuit, a PNP triode Q2, a resistor R4-7 and a capacitor C1, wherein the input end of the power supply main circuit is connected with an external power supply, the power supply main circuit is provided with a VCC end, a VDD end, a GNS end, an LED+ terminal and an LED-terminal, the emitter of the PNP triode Q2 is connected with the LED+ terminal of the power supply main circuit and one end of a load, the base of the PNP triode Q2 is respectively connected with one end of a resistor R6, the LED-terminal of the power supply main circuit and the other end of the load through a resistor R5, the collector of the PNP triode Q2 is respectively connected with one end of a resistor R7, one end of a capacitor C1 and the control circuit, the other end of the resistor R6, the other end of the capacitor C1 and the GNS end of the power supply main circuit, the power supply end of the control circuit is connected with the VCC end of the power supply main circuit, the power supply end of the driving circuit is connected with the end of the power supply main circuit, and the output end of the control circuit is connected with the LED-terminal of the power supply main circuit through the driving circuit; through the structure, after the power supply is electrified, if the short circuit phenomenon occurs at two ends of the lamp, the potential difference between the LED+ terminal and the LED-terminal is 0, the PNP triode Q2 is cut off, the control circuit detects a short circuit signal through the resistor R7, and the control circuit prohibits outputting a driving signal, so that the dimming power supply is protected.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic block diagram of an LED dimming power supply with short circuit detection;
fig. 2 is a schematic circuit diagram of an LED dimming power supply with short circuit detection.
Detailed Description
Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.
In the description of the present utility model, plural means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and the above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the present utility model, unless clearly defined otherwise, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and may be connected directly or indirectly through an intermediary; the connecting device can be fixedly connected, detachably connected and integrally formed; may be a mechanical connection; may be a communication between two elements or an interaction between two elements. The specific meaning of the words in the utility model can be reasonably determined by a person skilled in the art in combination with the specific content of the technical solution.
Referring to fig. 1 to 2, an LED dimming power supply with a short circuit detection function includes a power supply main circuit, a control circuit, a driving circuit, a PNP transistor Q2, a resistor R4-7, and a capacitor C1, wherein an input end of the power supply main circuit is connected to an external power supply, the power supply main circuit has a VCC end, a VDD end, a GNS end, an led+ terminal, and an LED-terminal, an emitter of the PNP transistor Q2 is connected to an led+ terminal of the power supply main circuit and one end of a load, a base of the PNP transistor Q2 is connected to one end of the resistor R6, the LED-terminal of the power supply main circuit, and the other end of the load via the resistor R4, a collector of the PNP transistor Q2 is connected to one end of the resistor R7, one end of the capacitor C1, the other end of the resistor R7, and the other end of the capacitor C1, the power supply end of the control circuit is connected to the GNS end of the power supply main circuit, the power supply end of the driving circuit is connected to the end of the power supply main circuit, and the output end of the control circuit is connected to the LED of the power supply main circuit via the driving circuit.
The driving circuit comprises a driving chip U2, a resistor R1-3 and a MOS tube Q1, one end of the resistor R2 and a power end of the driving chip U2 are connected with a VDD end of the power supply main circuit, the other end of the resistor R2 is connected with a first input end of the driving chip U2 and a GNS end of the power supply main circuit through the resistor R3, a second input end of the driving chip U2 is connected with an output end of the control circuit, a grounding end of the driving chip U2 is connected with the GNS end of the power supply main circuit, an output end of the driving chip U2 is connected with a grid electrode of the MOS tube Q1 through the resistor R1, a source electrode of the MOS tube Q1 is connected with the GNS end of the power supply main circuit, and a drain electrode of the MOS tube Q1 is connected with an LED-terminal of the power supply main circuit.
The working principle of the utility model is as follows: the power supply main circuit transmits the received alternating current input voltage to the two input ends of the power supply main circuit through the input live wire terminal L and the input zero wire terminal N, and the LED+ terminal, the VDD end, the VCC end, the LED-terminal and the GNS end are respectively output after being processed by the power supply main circuit, and the two ends of the LED+ terminal and the LED-terminal are connected with the lamp.
After the power is electrified, if the short circuit phenomenon does not occur at the two ends of the lamp, the LED+ terminal passes through the base electrode of the PNP triode Q2, the resistor R4 and the resistor R6 to the GNS end through the emitter electrode of the PNP triode Q2, the PNP triode Q2 is further conducted, the conducted voltage is connected to the 5 th pin of the singlechip U1 after being subjected to voltage division through the resistor R5 and the resistor R7 and filtering of the capacitor C1, the singlechip U1 detects a normal signal, no lamp short circuit is judged, the 7 th pin of the singlechip U1 outputs a driving signal to the 3 rd pin of the driving chip U2, the driving chip U2 outputs the driving signal through the 5 th pin of the driving chip U2 after amplifying, the NMOS tube Q1 is conducted through the resistor R1, and the NMOS tube Q1 drives the lamp.
After the power is electrified, if the short circuit phenomenon occurs at the two ends of the lamp, the potential difference between the LED+ terminal and the LED-terminal is 0, the PNP triode Q2 is cut off, the resistor R7 pulls the 5 th pin of the singlechip U1 to the GNS terminal, at the moment, the singlechip U1 detects a short circuit signal, and the 7 th pin of the singlechip U1 prohibits outputting a driving signal, so that the dimming power supply is protected.
Of course, the present utility model is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications and substitutions without departing from the spirit of the present utility model, and these equivalent modifications and substitutions are included in the scope of the present utility model as defined in the appended claims.
Claims (2)
1. An LED dimming power supply with short circuit detection function, which is characterized in that: the power supply comprises a power supply main circuit, a control circuit, a driving circuit, a PNP triode Q2, a resistor R4-7 and a capacitor C1, wherein the input end of the power supply main circuit is connected with an external power supply, the power supply main circuit is provided with a VCC end, a VDD end, a GNS end, an LED+ terminal and an LED-terminal, the emitter of the PNP triode Q2 is connected with the LED+ terminal of the power supply main circuit and one end of a load, the base of the PNP triode Q2 is respectively connected with one end of a resistor R6, the LED-terminal of the power supply main circuit and the other end of the load through a resistor R4, the collector of the PNP triode Q2 is respectively connected with one end of the resistor R7, one end of the capacitor C1 and the control circuit through a resistor R5, the other end of the resistor R7 and the other end of the capacitor C1 are connected with the GNS end of the power supply main circuit, the power supply end of the control circuit is connected with the VCC end of the power supply main circuit, the power supply end of the driving circuit is connected with the LED-terminal of the power supply main circuit, and the output end of the control circuit is connected with the LED-terminal of the power supply main circuit through the driving circuit.
2. The LED dimming power supply with short circuit detection function according to claim 1, wherein: the driving circuit comprises a driving chip U2, a resistor R1-3 and a MOS tube Q1, one end of the resistor R2 and a power end of the driving chip U2 are connected with a VDD end of the power supply main circuit, the other end of the resistor R2 is connected with a first input end of the driving chip U2 and a GNS end of the power supply main circuit through the resistor R3, a second input end of the driving chip U2 is connected with an output end of the control circuit, a grounding end of the driving chip U2 is connected with the GNS end of the power supply main circuit, an output end of the driving chip U2 is connected with a grid electrode of the MOS tube Q1 through the resistor R1, a source electrode of the MOS tube Q1 is connected with the GNS end of the power supply main circuit, and a drain electrode of the MOS tube Q1 is connected with an LED-terminal of the power supply main circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320958119.4U CN219761391U (en) | 2023-04-24 | 2023-04-24 | LED dimming power supply with short circuit detection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320958119.4U CN219761391U (en) | 2023-04-24 | 2023-04-24 | LED dimming power supply with short circuit detection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219761391U true CN219761391U (en) | 2023-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320958119.4U Active CN219761391U (en) | 2023-04-24 | 2023-04-24 | LED dimming power supply with short circuit detection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219761391U (en) |
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2023
- 2023-04-24 CN CN202320958119.4U patent/CN219761391U/en active Active
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