Buck architecture constant power control circuit

Abstract

The utility model relates to the technical field of LED control circuits, in particular to a Buck architecture constant power control circuit, which comprises an input direct current power supply VIN, a GND, a C1, an R1, a U5, a C2, a D1, an L1, an R2, an R3, an R4, an R5, an MCU control unit and an LED load, the input direct current power supply VIN is connected with the cathode of the C1, the cathode of the D1, one end of the R2 and the anode of the LED load, the input direct current power supply GND is connected with the other end of the C1, the eighth pin of the U5, the GND, one end of the R4, one end of the R5, one end of the R1 and one end of the C2, the anode of the D1 is connected with the fifth pin of the U5 and one end of the L1, the anode of the R3 is connected the other end of the L1 is connected with one end of the R3 and the cathode of the LED load, the other ends of the resistors R2 and R4 are connected to the MCU, the other ends of the resistors R3 and R5 are connected to the MCU, the other end of the resistor R1 is connected with the fourth pin of the U5, and the other end of the capacitor C2 is connected with the sixth pin of the U5. The Buck architecture constant power control circuit is simple in circuit, can control the constant power of the LED load, and has the advantages of high efficiency, energy conservation and good stability.

Description

Technical Field

[0001] The utility model relates to the technical field of LED control circuits, and in particular to a Buck architecture constant power control circuit. Background Art

[0002] The background technology behind constant power control for LED driver power supplies primarily relates to the operating characteristics of LEDs and the need for stable operation. As a green, renewable energy source that generates light using its own electrical properties, LEDs offer a long lifespan, compact size, high luminous efficiency, and the ability to produce a variety of light colors. Consequently, they are widely used in street lighting, indoor lighting, tunnel lighting, traffic lighting, and even plant lighting.

[0003] However, existing LED currents are all constant current outputs. When connected to LED lamps of different voltages, their power is inconsistent and the stability is poor, resulting in inconsistent brightness of the LED lamps. Therefore, a constant power control circuit is urgently needed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide an emergency rescue fast Buck architecture constant power control circuit to solve the technical problems of poor stability and inconsistent and non-uniform brightness of existing constant current output LED lamps.

[0005] The utility model discloses a Buck architecture constant power control circuit, comprising an input DC power supply VIN, an input DC power supply GND, a filter capacitor C1, a resistor R1, a chip IC U5, a capacitor C2, a freewheeling diode D1, an inductor L1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an MCU control unit and an LED load, wherein the input DC power supply VIN is connected to the filter capacitor C1, the cathode of the freewheeling diode D1, one end of the resistor R2 and the anode of the LED load, the input DC power supply GND is connected to the other end of the filter capacitor C1, the 8th pin of the chip ICU5, the MCU control unit GND, one end of the resistor R4, one end of the resistor R5, one end of the resistor R1 and one end of the capacitor C2, the anode of the freewheeling diode D1 is connected to the 5th pin of the chip IC U5 and one end of the inductor L1, the other end of the inductor L1 is connected to one end of the resistor R3 and the cathode of the LED load, the other ends of the resistors R2 and R4 are connected to the MCU control unit, the other ends of the resistors R3 and R5 are connected to the MCU control unit, and the other end of the resistor R1 is connected to the chip IC The other end of the capacitor C2 is connected to the 4th pin of the chip IC U5.

[0006] Preferably, the MCU control unit is connected to the input DC power supply VIN through the voltage division signal of the resistor R2 and the resistor R4, the MCU control unit is connected to the LED load cathode through the voltage division signal of the resistor R3 and the resistor R5, and the MCU control unit connects the HPWM control signal to the second pin of the chip IC U5.

[0007] Compared with the prior art, the beneficial effects of the present invention are:

[0008] This utility model features a Buck architecture constant power control circuit. By incorporating a lamp voltage detection circuit under constant current drive conditions, constant power control is achieved. This approach offers advantages such as high efficiency, energy saving, excellent stability, and high reliability. It dynamically adjusts the output current according to the varying operating voltages of LEDs, maintaining constant output power and achieving a higher energy efficiency ratio. When connected to LED lamps of varying voltages, both power and brightness remain consistent, meeting diverse application requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0010] Figure 1 This is a schematic diagram of a Buck architecture constant power control circuit of the present invention. DETAILED DESCRIPTION

[0011] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0012] like Figure 1As shown, a Buck architecture constant power control circuit of the present invention includes an input DC power supply VIN, an input DC power supply GND, a filter capacitor C1, a resistor R1, a chip IC U5, a capacitor C2, a freewheeling diode D1, an inductor L1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an MCU control unit and an LED load, wherein the input DC power supply VIN is connected to the filter capacitor C1, the cathode of the freewheeling diode D1, one end of the resistor R2 and the anode of the LED load, the input DC power supply GND is connected to the other end of the filter capacitor C1, the 8th pin of the chip IC U5, the MCU control unit GND, one end of the resistor R4, one end of the resistor R5, one end of the resistor R1 and one end of the capacitor C2, the anode of the freewheeling diode D1 is connected to the 5th pin of the chip IC U5 and one end of the inductor L1, the other end of the inductor L1 is connected to one end of the resistor R3 and the cathode of the LED load, the other ends of the resistors R2 and R4 are connected to the MCU control unit, the other ends of the resistors R3 and R5 are connected to the MCU control unit, and the other end of the resistor R1 is connected to the chip IC The other end of the capacitor C2 is connected to the 4th pin of the chip IC U5.

[0013] The MCU control unit is connected to the input DC power supply VIN through the voltage division signal of the resistor R2 and the resistor R4, and is connected to the cathode of the LED load through the voltage division signal of the resistor R3 and the resistor R5. The MCU control unit connects the HPWM control signal to the second pin of the chip IC U5.

[0014] The working principle of the Buck architecture constant power control circuit is:

[0015] The MCU control unit is connected to the input DC power supply VIN and the voltage divided signal is obtained by resistors R2 and R4. The MCU control unit is connected to the cathode of the LED load and the voltage value of the LED load is obtained by subtracting the voltage divided signals of resistors R3 and R5. The Buck control chip IC U5 controls the maximum constant current value through the voltage signal of resistor R1. The MCU control unit is connected to the LED load voltage value and outputs the HPWM control signal to the second pin of the chip IC U5 to achieve constant power control of the LED load.

[0016] This utility model features a Buck architecture constant power control circuit. By incorporating a lamp voltage detection circuit under constant current drive conditions, constant power control is achieved. This approach offers advantages such as high efficiency, energy saving, excellent stability, and high reliability. It dynamically adjusts the output current according to the varying operating voltages of LEDs, maintaining constant output power and achieving a higher energy efficiency ratio. When connected to LED lamps of varying voltages, both power and brightness remain consistent, meeting diverse application requirements.

[0017] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A Buck architecture constant power control circuit, characterized by: It includes an input DC power supply VIN, an input DC power supply GND, a filter capacitor C1, a resistor R1, a chip IC U5, a capacitor C2, a freewheeling diode D1, an inductor L1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an MCU control unit and an LED load. The input DC power supply VIN is connected to the filter capacitor C1, the cathode of the freewheeling diode D1, one end of the resistor R2 and the anode of the LED load. The input DC power supply GND is connected to the other end of the filter capacitor C1, the 8th pin of the chip ICU5, the MCU control unit GND, one end of the resistor R4, one end of the resistor R5, one end of the resistor R1 and one end of the capacitor C2. The anode of the freewheeling diode D1 is connected to the 5th pin of the chip IC U5 and one end of the inductor L1. The other end of the inductor L1 is connected to one end of the resistor R3 and the cathode of the LED load. The other ends of the resistors R2 and R4 are connected to the MCU control unit. The other ends of the resistors R3 and R5 are connected to the MCU control unit. The other end of the resistor R1 is connected to the 4th pin of the chip IC U5. The other end of the capacitor C2 is connected to the 6th pin of the chip IC U5.

2. The Buck architecture constant power control circuit according to claim 1, wherein: The MCU control unit is connected to the input DC power supply VIN through the voltage division signal of the resistor R2 and the resistor R4. The MCU control unit is connected to the cathode of the LED load through the voltage division signal of the resistor R3 and the resistor R5. The MCU control unit connects the HPWM control signal to the second pin of the chip IC U5.

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