CN214228516U - LED power overpower protection circuit - Google Patents
LED power overpower protection circuit Download PDFInfo
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- CN214228516U CN214228516U CN202120468060.1U CN202120468060U CN214228516U CN 214228516 U CN214228516 U CN 214228516U CN 202120468060 U CN202120468060 U CN 202120468060U CN 214228516 U CN214228516 U CN 214228516U
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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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Abstract
The utility model discloses a LED power overpower protection circuit, including the power main circuit, the power main circuit includes first output VDD and second output V +, still includes resistance R1, NMOS pipe Q1, emitting diode LED1, voltage detection feedback module and has power end, earthing terminal, drive signal end, current detection end and overcurrent short-circuit protection module CN1 of current setting end; after the output voltage of the LED power supply is raised, the overcurrent short-circuit protection module CN1 is used for detecting voltage and current signals and controlling the output current within a safe range, so that the power of the LED power supply cannot exceed the rated power, and the safety of the LED power supply is ensured.
Description
Technical Field
The utility model relates to a LED power supply circuit and controller circuit field, in particular to LED power overpower protection circuit.
Background
With the rapid development of the LED lighting industry, LEDs are installed in all households and outdoor lighting at present, so that the LED power supply market is developed vigorously, and the requirements on the LED power supply are higher and higher; in practical application, a plurality of lamps are far away from a power supply, so that an output power line is pulled to be long, the voltage drop of a transmission line is large, the voltage from the power supply voltage to the lamps is pulled low, and the brightness of the lamps cannot reach the maximum; therefore, most methods improve the output voltage, and under the condition that the output current is still unchanged, the power of the LED power supply is too high, exceeds the use standard of components, and the LED power supply is seriously damaged, so that it is necessary to develop an over-power protection circuit for the LED power supply.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a LED power overpower protection circuit.
The utility model discloses a technical scheme that its technical problem was solved to an embodiment adopted is: an LED power over-power protection circuit comprises a power main circuit, wherein the power main circuit comprises a first output end VDD and a second output end V +, and further comprises a resistor R1, an NMOS tube Q1, a light-emitting diode LED1, a voltage detection feedback module and an over-current short-circuit protection module CN1 with a power supply end, a ground end, a driving signal end, a current detection end and a current setting end, the input end of the main circuit is connected with an external power supply, the first output end VDD of the power main circuit is connected with the power supply end of the over-current short-circuit protection module CN1, the second output end V + of the power main circuit is respectively connected with the anode of the light-emitting diode LED1 and the input end of the voltage detection feedback module, the cathode of the light-emitting diode LED1 is connected with the drain of the NMOS tube Q1, the source of the NMOS tube Q1 is respectively connected with one end of the resistor R1 and the current detection end of the over-current short-circuit protection module CN1, the gate of the NMOS tube Q1 is connected with the driving signal end of the over-current short-circuit protection module CN1, the output end of the voltage detection feedback module is connected with the current setting end of the overcurrent short-circuit protection module CN1, and the other end of the resistor R1 is grounded with the grounding end of the overcurrent short-circuit protection module CN 1.
The voltage detection feedback module comprises a voltage regulator tube Z1, a resistor R2-5 and an NPN triode Q2, wherein the negative electrode of the voltage regulator tube Z1 is connected with the anode of the light emitting diode LED1, the positive electrode of the voltage regulator tube Z1 is respectively connected with one end of a resistor R3 and the base electrode of the NPN triode Q2 through a resistor R2, the emitter electrode of the NPN triode Q2 is respectively connected with the other end of the resistor R3 and the grounding end, the collector electrode of the NPN triode Q2 is respectively connected with one end of a resistor R4 and the current setting end of the over-current short-circuit protection module CN1 through the resistor R5, and the other end of the resistor R4 is grounded.
The utility model has the advantages that: an LED power supply overpower protection circuit comprises a power supply main circuit, wherein the power supply main circuit comprises a first output end VDD and a second output end V +, and further comprises a resistor R1, an NMOS tube Q1, a light-emitting diode LED1, a voltage detection feedback module and an overcurrent and short circuit protection module CN1, wherein the overcurrent and short circuit protection module CN1 is provided with a power supply end, a grounding end, a driving signal end, a current detection end and a current setting end; after the output voltage of the LED power supply is raised, the overcurrent short-circuit protection module CN1 is used for detecting voltage and current signals and controlling the output current within a safe range, so that the power of the LED power supply cannot exceed the rated power, and the safety of the LED power supply is ensured.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic block diagram of an LED power over-power protection circuit;
fig. 2 is a schematic circuit diagram of an LED power over-power protection circuit.
Detailed Description
This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.
In the description of the present invention, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as excluding the number, and the terms greater than, less than, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood 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 invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly defined, the terms "set," "mounted," "connected," and the like are to be understood in a broad sense, and may be directly connected or indirectly connected through an intermediate medium, for example; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be a mechanical connection; either as communication within the two elements or as an interactive relationship of the two elements. The technical skill in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solution.
Referring to fig. 1-2, an LED power over-power protection circuit includes a power main circuit, the power main circuit includes a first output terminal VDD and a second output terminal V +, and further includes a resistor R1, an NMOS transistor Q1, a light emitting diode LED1, a voltage detection feedback module 10, and an over-current short-circuit protection module CN1 having a power terminal, a ground terminal, a driving signal terminal, a current detection terminal, and a current setting terminal, an input terminal of the main circuit is connected to an external power source, the first output terminal VDD of the power main circuit is connected to the power terminal of the over-current short-circuit protection module CN1, the second output terminal V + of the power main circuit is connected to an anode of the light emitting diode LED1 and an input terminal of the voltage detection feedback module 10, a cathode of the light emitting diode LED1 is connected to a drain of the NMOS transistor Q1, a source of the NMOS transistor Q1 is connected to one terminal of the resistor R1 and the current detection terminal of the over-current short-circuit protection module CN1, the grid of the NMOS transistor Q1 is connected to the driving signal end of the over-current short-circuit protection module CN1, the output end of the voltage detection feedback module 10 is connected to the current setting end of the over-current short-circuit protection module CN1, and the other end of the resistor R1 is grounded to the ground end of the over-current short-circuit protection module CN 1.
The voltage detection feedback module 10 comprises a voltage regulator tube Z1, a resistor R2-5 and an NPN triode Q2, wherein the negative electrode of the voltage regulator tube Z1 is connected with the anode of the light emitting diode LED1, the positive electrode of the voltage regulator tube Z1 is respectively connected with one end of the resistor R3 and the base electrode of the NPN triode Q2 through a resistor R2, the emitter electrode of the NPN triode Q2 is respectively connected with the other end of the resistor R3 and the grounding end, the collector electrode of the NPN triode Q2 is respectively connected with one end of the resistor R4 and the current setting end of the over-current short-circuit protection module CN1 through the resistor R5, and the other end of the resistor R4 is grounded.
The working principle of the utility model is as follows:
when the system is powered on, the power supply circuit transmits the received alternating current input voltage to the input two ends of the power supply main circuit through the input live wire terminal L and the input zero line terminal N, and then outputs a first output end V + and a second output end VDD respectively after being processed by the power supply main circuit, and the overcurrent short-circuit protection module CN1 has the functions of all pins: CN1-1 pin: a power supply terminal of the power supply; CN1-2 pin: a ground terminal; CN1-3 pin: a drive signal terminal; CN1-4 pin: the current detection end is used for closing the driving signal when the detected current feedback signal is greater than the set current; CN1-5 pin: at the current setting end, the larger the resistance value of the pull-down resistor is, the larger the current is; the first output end V + is connected to the anode of the light-emitting diode LED1, the drive signal end of the overcurrent short-circuit protection module CN1 outputs a drive signal to drive the NMOS tube Q1, the NMOS tube Q1 pulls down the cathode of the light-emitting diode LED1, the light-emitting diode LED1 lights up, and the current on the NMOS tube Q1 flows through the resistor R1 to the ground end; meanwhile, a current signal on the resistor R1 is fed back to a current detection end of the overcurrent short-circuit protection module CN1, so that the output current of the LED power supply is monitored in real time; the resistor R4 is pulled down at the current setting end of the overcurrent short-circuit protection module CN1, and the current is set at I1，V+*I1P, e.g. the first current output V + is 12V, I1The current is 10A, so the power of the LED power supply is 12V × 10A — 120W, and the current I is obtained by selecting a suitable resistance value for the resistor R41The voltage is set at 10A, when the output power line is pulled longer, the voltage of the first output end V + needs to be raisedThe voltage is up to 14V, the raised voltage 14V reaches the conduction threshold value of the Zener diode Z1, the NPN triode Q2 is conducted after passing through the Zener diode Z1, the resistor R2 and the resistor R3, the resistor R5 is pulled to the ground end by the NPN triode Q2 to be conducted, the resistor R4 and the resistor R5 are connected in parallel, the resistance value is reduced, the current set by the overcurrent short-circuit protection module CN1 is also reduced, and I2＝120W/14V，I2When the resistance value of the resistor R5 is properly selected, the current I is adjusted to 8.57A2The power supply is arranged at 8.57A, the output power is ensured to be 120W, and therefore the LED power supply is protected from being damaged.
Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications and substitutions are included in the scope defined by the claims of the present application.
Claims (2)
1. The utility model provides a LED power overpower protection circuit, includes the power main circuit, the power main circuit includes first output VDD and second output V +, its characterized in that: the LED driving circuit also comprises a resistor R1, an NMOS tube Q1, a light-emitting diode LED1, a voltage detection feedback module (10) and an overcurrent and short-circuit protection module CN1 with a power supply end, a ground end, a driving signal end, a current detection end and a current setting end, wherein the input end of the main circuit is connected with an external power supply, a first output end VDD of the main circuit is connected with the power supply end of the overcurrent and short-circuit protection module CN1, a second output end V + of the main circuit is respectively connected with an anode of the light-emitting diode LED1 and the input end of the voltage detection feedback module (10), a cathode of the light-emitting diode LED1 is connected with a drain electrode of the NMOS tube Q1, a source electrode of the NMOS tube Q1 is respectively connected with one end of a resistor R1 and the current detection end of the overcurrent and short-circuit protection module CN1, a gate electrode of the NMOS tube Q1 is connected with the driving signal end of the overcurrent and short-circuit protection module CN1, an output end of the voltage detection feedback module (10) is connected with the current setting end of the overcurrent and short-circuit protection module CN1, the other end of the resistor R1 and the grounding end of the overcurrent short-circuit protection module CN1 are grounded.
2. The LED power over-power protection circuit of claim 1, wherein: the voltage detection feedback module (10) comprises a voltage regulator tube Z1, a resistor R2-5 and an NPN triode Q2, wherein the negative electrode of the voltage regulator tube Z1 is connected with the anode of the light emitting diode LED1, the positive electrode of the voltage regulator tube Z1 is respectively connected with one end of a resistor R3 and the base electrode of the NPN triode Q2 through a resistor R2, the emitter of the NPN triode Q2 is respectively connected with the other end of the resistor R3 and the ground terminal, the collector of the NPN triode Q2 is respectively connected with one end of a resistor R4 and the current setting end of the overcurrent short-circuit protection module CN1 through the resistor R5, and the other end of the resistor R4 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120468060.1U CN214228516U (en) | 2021-03-03 | 2021-03-03 | LED power overpower protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120468060.1U CN214228516U (en) | 2021-03-03 | 2021-03-03 | LED power overpower protection circuit |
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| CN214228516U true CN214228516U (en) | 2021-09-17 |
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| CN202120468060.1U Active CN214228516U (en) | 2021-03-03 | 2021-03-03 | LED power overpower protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114007306A (en) * | 2021-11-25 | 2022-02-01 | 鸣志电器(太仓)有限公司 | Nuclear radiation resistant LED driver circuit |
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2021
- 2021-03-03 CN CN202120468060.1U patent/CN214228516U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114007306A (en) * | 2021-11-25 | 2022-02-01 | 鸣志电器(太仓)有限公司 | Nuclear radiation resistant LED driver circuit |
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