CN214799976U

CN214799976U - Voltage reducing module of LED lamp

Info

Publication number: CN214799976U
Application number: CN202120728486.6U
Authority: CN
Inventors: 杜煜; 黄新永; 杨静静
Original assignee: Henan Guorui Lighting Technology Co ltd
Current assignee: Henan Guorui Lighting Technology Co ltd
Priority date: 2021-04-08
Filing date: 2021-04-08
Publication date: 2021-11-19
Anticipated expiration: 2031-04-08

Abstract

The utility model discloses a LED lamp voltage reduction module, including step-down control circuit and output voltage feedback circuit, step-down control circuit includes the step-down chip, first electric capacity, second electric capacity and fourth electric capacity, the one end of second electric capacity and fourth electric capacity is connected simultaneously in the voltage input foot of step-down chip, the other end of second electric capacity and fourth electric capacity all grounds, first electric capacity is connected between the voltage regulation bypass foot and the voltage input foot of step-down chip, the voltage output foot and the voltage feedback foot of step-down chip are connected with output voltage feedback circuit, the ground connection foot ground connection of step-down chip; the utility model discloses simple structure prevents that LED lamps and lanterns supply voltage is too high, has guaranteed LED lamp result of use.

Description

Voltage reducing module of LED lamp

Technical Field

The utility model belongs to the technical field of LED lamp illumination, a LED lamps and lanterns step-down module is related to.

Background

The LED is used as a novel light source, has the characteristics of energy conservation, environmental protection and high efficiency, has mature technology and is applied to various fields, and the LED is widely used as a lighting source, and various LED driving circuits appear along with the LED driving circuit. The LED is used as a constant-current working load, and because the LED has strict requirements on working voltage, the LED works abnormally due to overhigh voltage and overlow voltage, the power supply quality of the power supply voltage directly influences the reliability of the LED. The existing LED lamp is connected with a power supply through a wire, the wire can generate voltage drop when being long, the voltage reaching the LED lamp is lower than the voltage of normal work of the LED lamp, so the voltage of the power supply is higher than the normal working voltage of the LED lamp, but the length of the wire is difficult to control so as to reach the normal working voltage of the LED lamp, the power supply voltage of the LED lamp is too high, and the use effect of the LED is reduced.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a LED lamps and lanterns voltage reduction module, fine solution LED lamp supply voltage too high problem among the prior art.

In order to realize the purpose, the utility model discloses a technical scheme as follows: the utility model provides a LED lamps and lanterns step-down module, includes step-down control circuit and output voltage feedback circuit, and step-down control circuit includes step-down chip, first electric capacity, second electric capacity and fourth electric capacity, the one end of second electric capacity and fourth electric capacity is connected simultaneously in the voltage input foot of step-down chip, and the other end of second electric capacity and fourth electric capacity is ground connection all, first electric capacity is connected between the voltage regulation bypass foot and the voltage input foot of step-down chip, and the voltage output foot and the voltage feedback foot and the output voltage feedback circuit of step-down chip are connected, and the ground connection foot ground connection of step-down chip.

Furthermore, the output voltage feedback circuit comprises a second diode, a first inductor, a sliding resistor, a fourth resistor, a sixth capacitor, a fifth capacitor, a first resistor and a light emitting diode, the second diode, the fourth resistor, the sixth capacitor, the fifth capacitor and the first resistor are connected in parallel between a voltage output pin and a grounding pin of the buck chip, the fourth resistor is connected in series with the sliding resistor, a sliding contact of the sliding resistor is connected to the voltage feedback pin of the buck chip, one end of the first inductor is connected with a cathode of the second diode, the other end of the first inductor is connected with one end of the sliding resistor departing from the fourth resistor, a cathode and an anode of the second diode are respectively connected with the voltage output pin and the grounding pin of the buck chip, one end of the first resistor is connected with an anode of the light emitting diode, the other end of the first resistor is connected with one end of the first inductor departing from a voltage output end of the buck chip, and the cathode of the light emitting diode is grounded.

Furthermore, the voltage reduction control circuit is connected with a polarity reversal connection prevention circuit.

Furthermore, the polarity reversal connection preventing circuit comprises an MOS, a first diode, a third resistor and a third capacitor, wherein a source electrode of the MOS, one end of the third capacitor and a negative electrode of the first diode are connected with a voltage input pin of the voltage reduction chip, a grid electrode of the MOS, the other end of the third capacitor and a positive electrode of the first diode are connected with one end of the third resistor, the other end of the third resistor is connected with a grounding pin of the voltage reduction chip, and a drain electrode of the triode is connected with the voltage input end.

Furthermore, the model of the voltage reduction chip is XL 4015.

Furthermore, the second capacitor and the fifth capacitor are electrolytic capacitors, and the first diode is a voltage stabilizing diode.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses in, transmission voltage feedback circuit's voltage output end is connected with the LED lamp, detects and feeds back to the step-down chip to the supply voltage of LED lamp, after step-down control circuit steps down the higher supply voltage of input, gives output voltage feedback circuit output LED lamp normal operating voltage and supplies power for the LED lamp, the utility model discloses simple structure prevents that LED lamp supply voltage is too high, has guaranteed the result of use of LED lamp.

Drawings

Fig. 1 is a circuit diagram of the present invention.

In the figure: the LED driving circuit comprises a voltage reduction control circuit (1), an output voltage feedback circuit (2), a polarity reversal connection preventing circuit (3), a voltage reduction chip (U1), a first capacitor (C1), a second capacitor (C2), a fourth capacitor (C4), a second diode (D2), a first inductor (L1), a sliding resistor (R2), a fourth resistor (R4), a sixth capacitor (C6), a fifth capacitor (C5), a first resistor (R1), a light emitting diode (D3), an MOS (Q1), a first diode (D1), a third resistor (R3) and a third capacitor (C3).

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, a LED lamp voltage reduction module, including step-down control circuit 1 and output voltage feedback circuit 2, step-down control circuit 1 includes step-down chip U1, first electric capacity C1, second electric capacity C2 and fourth electric capacity C4, second electric capacity C2 and fourth electric capacity C4's one end is connected in step-down chip U1's voltage input pin Vin simultaneously, second electric capacity C2 and fourth electric capacity C4's the other end all ground connection, first electric capacity C1 connects between step-down chip U1's voltage regulation bypass pin VC and point voltage input pin Vin, step-down chip U1's voltage output pin SW and voltage feedback pin FB are connected with output voltage feedback circuit 2, step-down chip U1's ground connection pin GND. When the technical scheme is used, the voltage input pin Vin of the voltage reduction chip U1 inputs 36V input voltage, the output voltage is detected through the output voltage feedback circuit 2 and fed back to the voltage reduction chip U1, voltage reduction is carried out, the output voltage is adjusted to be 24V, the output voltage of the voltage reduction module is stabilized at 24V, and the overhigh power supply voltage of the LED lamp is prevented.

In this embodiment, the output voltage feedback circuit 2 includes a second diode D2, a first inductor L1, a sliding resistor R2, a fourth resistor R4, a sixth capacitor C6, a fifth capacitor C5, a first resistor R1, and a light emitting diode D3, the second diode D2, the fourth resistor R4, the sixth capacitor C6, the fifth capacitor C5, and the first resistor R1 are connected in parallel to each other between a voltage output pin SW of the buck chip U1 and a ground pin GND, the fourth resistor R4 and the sliding resistor R2 are connected in series, a sliding contact of the sliding resistor R2 is connected to the voltage feedback pin FB of the buck chip U1, one end of the first inductor L1 is connected to a cathode of the second diode D2, the other end of the first inductor L1 is connected to one end of the sliding resistor R2 away from the fourth resistor R4, a cathode and an anode of the second diode D2 are connected to the voltage output pin SW 1 and a positive electrode of the buck chip SW 1, the first diode D3 is connected to the ground pin SW, the other end of the first resistor R1 is connected with one end of the first inductor L1, which is far away from the voltage output end of the buck chip U1, and the cathode of the light-emitting diode D3 is grounded; the output voltage feedback circuit 2 realizes the feedback of the output voltage; and the sliding resistor R2 can change the resistance value of the connecting voltage reduction chip U1, so that different voltages can be adjusted.

In this embodiment, the voltage reduction control circuit 1 is connected with a polarity reversal connection preventing circuit 3; prevent that power supply positive negative pole from connecing reversely, improving the utility model discloses a security and reliability.

Specifically, the anti-reverse polarity circuit 3 comprises a MOSQ1, a first diode D1, a third resistor R3 and a third capacitor C3, wherein a source of the MOSQ1, one end of the third capacitor C3 and a cathode of a first diode D1 are connected with a voltage input pin Vin of the buck chip U1, a gate of the MOSQ1, the other end of the third capacitor C3 and an anode of the first diode D1 are connected with one end of a third resistor R3, the other end of the third resistor R3 is connected with a ground pin GND of the buck chip U1, and a drain of the triode is connected with a voltage input end.

In this embodiment, the model of the voltage reduction chip U1 is XL 4015.

In this embodiment, the second capacitor C2 and the fifth capacitor C5 are electrolytic capacitors, and the first diode D1 is a zener diode.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a LED lamps and lanterns step-down module which characterized in that: including step-down control circuit and output voltage feedback circuit, step-down control circuit includes step-down chip, first electric capacity, second electric capacity and fourth electric capacity, the one end of second electric capacity and fourth electric capacity is connected simultaneously in the voltage input foot of step-down chip, and the other end of second electric capacity and fourth electric capacity is ground connection all, first electric capacity is connected between the voltage regulation bypass foot and the voltage input foot of step-down chip, and the voltage output foot and the voltage feedback foot of step-down chip are connected with output voltage feedback circuit, and the ground connection foot ground connection of step-down chip.

2. The LED lamp voltage reduction module of claim 1, wherein: the output voltage feedback circuit comprises a second diode, a first inductor, a sliding resistor, a fourth resistor, a sixth capacitor, a fifth capacitor, a first resistor and a light emitting diode, the second diode, the fourth resistor, the sixth capacitor, the fifth capacitor and the first resistor are mutually connected in parallel between a voltage output pin and a grounding pin of the voltage reduction chip, the fourth resistor is connected with the sliding resistor in series, a sliding contact of the sliding resistor is connected with the voltage feedback pin of the voltage reduction chip, one end of the first inductor is connected with the negative electrode of the second diode, the other end of the first inductor is connected with one end of the sliding resistor, which deviates from the fourth resistor, the negative electrode and the positive electrode of the second diode are respectively connected with the voltage output pin and the grounding pin of the voltage reduction chip, one end of the first resistor is connected with the positive electrode of the light emitting diode, and the other end of the first resistor is connected with one end of the first inductor, which deviates from the voltage output end of the voltage reduction chip, and the cathode of the light emitting diode is grounded.

3. The LED lamp voltage reduction module of claim 1, wherein: the voltage reduction control circuit is connected with a polarity reversal connection preventing circuit.

4. The LED lamp voltage reduction module of claim 3, wherein: the polarity-reversal-preventing circuit comprises an MOS, a first diode, a third resistor and a third capacitor, wherein a source electrode of the MOS, one end of the third capacitor and a negative electrode of the first diode are connected with a voltage input pin of the voltage-reducing chip, a grid electrode of the MOS, the other end of the third capacitor and a positive electrode of the first diode are connected with one end of the third resistor, the other end of the third resistor is connected with a grounding pin of the voltage-reducing chip, and a drain electrode of the triode is connected with the voltage input end.

5. The LED lamp voltage reduction module of claim 1, wherein: the model of the voltage reduction chip is XL 4015.

6. The LED lamp voltage reduction module of claim 2, wherein: the second capacitor and the fifth capacitor are electrolytic capacitors, and the first diode is a voltage stabilizing diode.