Low-power-consumption double-color-temperature constant-voltage driving power supply

Abstract

The utility model relates to the technical field of LED drive circuits, in particular to a low-power-consumption double-color-temperature constant-voltage drive power supply, which comprises an EMI circuit, the input end of the EMI circuit is connected with commercial power, the output end of the EMI circuit is connected with an EMC rectification filter circuit, and alternating current is converted into direct current through a rectification circuit. According to the utility model, through dial-up, color temperature adjustment is abundant, reliable and efficient, color temperature adjustment is carried out at eight gears, the oneness of a power supply output light source is enriched, the color temperature is accurate and stable every time, the light source is stable, the operation is simple, and the color of an output lamp strip is changed by adjusting the ratio of the color temperature through dial-up. The gear dial color temperature adjusting constant current driving power supply is smooth in color temperature adjusting process and free of stroboflash.

Description

TECHNICAL FIELD

[0001] The utility model relates to LED drive circuit technical field especially relates to a low -power consumption double color temperature constant voltage drive power supply. BACKGROUND

[0002] LED lighting is more and more applied scene, and different color temperature control (dimming) is required in some scenes. DALI dimming is a typical digital PWM dimming mode, which changes the voltage on the dimming circuit pin through the code switch, sends the required color temperature instruction to the lamp control end, and a total of eight code switches, which enriches the customer's color combination. The advantage is that the color temperature is accurate, stable, smooth and simple. However, most of the products on the market are single color dimming, and different color temperature needs to buy different lamp strips and power supplies to match, which occupies the volume and is single in color. INVENTION CONTENTS

[0003] In view of the defects of the prior art, the utility model provides a low -power consumption double color temperature constant voltage drive power supply to solve the technical problem of "LED power supply color temperature single" in the prior art.

[0004] To achieve the above purpose, the utility model realizes through the following technical schemes:

[0005] A low -power consumption double color temperature constant voltage drive power supply, characterized by comprising:

[0006] EMI circuit, the input end of EMI circuit is connected to the mains, and the output end is connected to EMC rectifier filter circuit, and then the alternating current is converted into direct current through the rectifier circuit;

[0007] Rectifier circuit, the rectifier circuit is used to convert the input alternating current into direct current;

[0008] Resonant conversion circuit LLC;

[0009] Boost circuit PFC, the input end of boost circuit is connected to the rectifier circuit, and the low -voltage direct current is converted into high -voltage direct current and then output to the resonant conversion circuit LLC;

[0010] Low -power consumption high -voltage starting circuit, the low -power consumption high -voltage starting circuit provides starting voltage, and the resistance R141, R142 on the network VBUCK is divided to give transistor Q104, and is used to supply power to chip U101, U102 respectively;

[0011] Transformer, the power supply voltage VCC of transformer is connected to boost circuit PFC, chip U101 and U102 through capacitor CE12 respectively;

[0012] Double color temperature dimming circuit CON3, the double color temperature dimming circuit CON3 is connected to the code switch, and the color temperature is adjusted by distributing the code switch gear.

[0013] As a preferred technical solution of this utility model, pin 1 of the dual-color temperature dimming circuit CON3 is electrically connected to power dimming MOSFETs Q3 and Q203 and sampling resistor R3 respectively, and pin 1 of the dual-color temperature dimming circuit CON3 is located between the power dimming MOSFETs and the sampling resistor R3, and is used to detect the voltage on the sampling resistor R3 pin.

[0014] As a preferred embodiment of this utility model, pins 2 and 3 of the dual-color temperature dimming circuit CON3 are connected to the gates of power dimming MOSFETs Q3 and Q20, respectively. Pin 4 of the dual-color temperature dimming circuit CON3 is connected to a DIP switch through three current-limiting resistors R43, R46, and R48. The voltage allocated by the DIP switch is then used to control the switching of the output color temperature by PWM voltage waveform commands.

[0015] As a preferred technical solution of this utility model, the input terminal of the EMI circuit is provided with a surge protection device RV11 and a surge suppression device RT11 to protect the circuit from breakdown when multiple parallel loads are input.

[0016] This invention provides a low-power dual-color temperature constant voltage drive power supply, which has the following advantages:

[0017] This invention addresses the technical problem of "single color temperature of LED power supply" in existing technologies, enabling the LED power supply color temperature to be switched as needed. Attached Figure Description

[0018] Figure 1 This is a schematic block diagram of the power supply circuit described in an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the power supply circuit described in an embodiment of the present invention. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments:

[0022] refer to Figures 1-2 A low-power dual-color temperature constant voltage drive power supply, comprising:

[0023] The EMI circuit has its input terminal connected to AC power and its output terminal connected to an EMC rectifier and filter circuit, which then converts AC power into DC power.

[0024] A rectifier circuit for converting input alternating current (AC) into direct current (DC);

[0025] Resonant conversion circuit LLC;

[0026] The boost circuit PFC has its input terminal connected to a rectifier circuit, which boosts the low-voltage DC power and outputs it to the resonant converter circuit LLC.

[0027] A low-power high-voltage startup circuit is provided to supply startup voltage. The voltage is divided by resistors R141 and R142 connected to the VBUCK network and supplied to transistor Q104, which in turn supplies power to chips U101 and U102 respectively.

[0028] The transformer, whose power supply voltage VCC supplies power to the boost circuit PFC, chip U101, and chip U102 via capacitor CE12;

[0029] The dual-color temperature dimming circuit CON3 is connected to a DIP switch, and the color temperature is adjusted by assigning different DIP switch positions.

[0030] The dual-color temperature dimming circuit CON3 has pins 1 electrically connected to power dimming MOSFETs Q3 and Q203 and sampling resistor R3, respectively. Pin 1 of the dual-color temperature dimming circuit CON3 is located between the power dimming MOSFETs and the sampling resistor R3 and is used to detect the voltage on the sampling resistor R3.

[0031] In this circuit, pins 2 and 3 of the dual-color temperature dimming circuit CON3 are connected to the gates of power dimming MOSFETs Q3 and Q20, respectively. Pin 4 of the dual-color temperature dimming circuit CON3 is connected to a DIP switch through three current-limiting resistors R43, R46, and R48. The voltage allocated by the DIP switch is then used to control the switching of the output color temperature by PWM voltage waveform commands.

[0032] The EMI circuit input terminal is equipped with a surge protection device RV11 and a surge suppression device RT11 to protect the circuit from breakdown when multiple parallel loads are input.

[0033] Specifically: such as Figure 1As shown, one input terminal of the EMI circuit is connected to the mains power, and the output terminal of the EMI circuit is connected to the input terminal of the rectifier circuit. The input terminal can be connected to mains power of 176Vac-264Vac. After the EMC rectifier filter circuit removes electrical signal noise, the AC power is converted to DC power by the rectifier circuit. The low-power high-voltage start-up circuit provides the start-up voltage, such as... Figure 2 As shown, when the input is turned on, the low-power high-voltage startup circuit starts working, and the voltage is divided by the two resistors R141 and R142 connected to the VBUCK network to start Q104, and power is supplied to the chips (U101 / U102) respectively.

[0034] Subsequently, transformer Q1 starts working, and its VCC winding, through capacitor CE12, supplies power to the boost circuit PFC and BUCK (U101 / U102), providing a stable 15V voltage. At this time, the low-power high-voltage startup circuit Q104 is off. After the primary circuits are working, the inductor L1 and transformer Q1 induce an electromotive force, which reaches the secondary side. Through the TL431 voltage regulation circuit, it is adjusted to a suitable voltage of 24V. MOSFETs Q21 and Q22, synchronous rectifier chip U201, and so on... When the rectifier circuit starts working, the dual-color temperature dimming circuit CON3 is also provided with a stable 24V voltage by the output electrolytic capacitor CE21, enabling the dual-color temperature dimming circuit CON3 to work. Among them, pin 1 (output current detection CURSEN) of the dual-color temperature dimming circuit CON3 is connected between the source of the power dimming MOSFETs Q3 and Q203 and the sampling resistor R3 to detect the voltage on the sampling resistor R3. This can realize that if the dual-color temperature dimming power supply has output overload and output short circuit faults, the output can be shut down in time to prevent damage to the power supply.

[0035] Pins 2 and 3 (PWM1, PWM2) of the dual-color temperature dimming circuit CON3 are connected to the gates of power dimming MOSFETs Q3 and Q203, respectively. Pin 4 (DIM) of the dual-color temperature dimming circuit CON3 is connected to the DIP switch through three current-limiting resistors R43, R46, and R48. The voltage allocated by the DIP switch is then connected to pins 2 and 3 (PWM1, PWM2) of the dual-color temperature dimming circuit CON3, respectively, to power dimming MOSFETs Q3 and Q203 to control the switching of the output color temperature using PWM voltage waveform commands.

[0036] The addition of surge protector RV11 and surge suppressor RT11 at the input end ensures that the circuit is not damaged by lightning strikes or when multiple inputs are connected in parallel and powered on, and prevents the relays from failing to start, effectively protecting the reliability of the circuit.

[0037] This invention solves the problem of limited color temperature in LED power supplies, providing a rich, reliable, and efficient color temperature adjustment system with eight adjustable color temperature levels via DIP switches. This enriches the power supply's output light source options, ensuring precise and stable color temperature adjustment, smooth light emission, and simple operation. The color temperature ratio is adjusted via DIP switches to change the color of the output LED strip, and the adjustment process is smooth and flicker-free. This is a constant current drive power supply with DIP-controlled color temperature adjustment.

[0038] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A low-power consumption dual-color temperature constant-voltage driving power supply, characterized in that, It includes: EMI circuit, the input end of the EMI circuit is connected to the mains, the output end is connected to the EMC rectifier circuit, and the alternating current is converted into direct current through the rectifier circuit; The rectifier circuit is used for converting the input alternating current into direct current; Resonant conversion circuit LLC; Boost circuit PFC, the input end of the boost circuit is connected to the rectifier circuit, and the low-voltage direct current is boosted and output to the resonant conversion circuit LLC; Low-power high-voltage starting circuit, the low-power high-voltage starting circuit provides starting voltage, and divides the voltage of resistors R141 and R142 on the VBUCK network to transistor Q104, which is used to supply power to chips U101 and U102 respectively; Transformer, the power supply voltage VCC of the transformer supplies power to the boost circuit PFC, the chip U101 and the chip U102 through the capacitor CE12 respectively; Dual-color temperature dimming circuit CON3, the dual-color temperature dimming circuit CON3 is connected to the code switch, and the color temperature is adjusted by distributing the code switch gear.

2. The low-power consumption dual-color temperature constant-voltage driving power supply according to claim 1, characterized in that, The pin 1 of the dual-color temperature dimming circuit CON3 is electrically connected with the power dimming mos tube Q3, Q203 and the sampling resistor R3, and the pin 1 of the dual-color temperature dimming circuit CON3 is located between the power dimming mos tube and the sampling resistor R3, which is used to detect the voltage on the pin of the sampling resistor R3.

3. The low-power consumption dual-color temperature constant-voltage driving power supply according to claim 2, characterized in that, The pins 2 and 3 of the dual-color temperature dimming circuit CON3 are respectively connected to the gate of the power dimming mos tube Q3, Q20, and the pin 4 of the dual-color temperature dimming circuit CON3 is connected to the code switch through three current limiting resistors R43, R46 and R48, and the voltage distributed by the code switch is distributed, and then the pins 2 and 3 of the dual-color temperature dimming circuit CON3 are respectively connected to the power dimming mos tube Q3, Q203 to control the output color temperature through PWM voltage waveform instruction.

4. The low-power consumption dual-color temperature constant-voltage driving power supply according to claim 1, characterized in that, The input end of the EMI circuit is provided with a lightning protection device RV11 and a surge suppression device RT11, which is used to protect the circuit from being broken down when multiple parallel loads are input.

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