Working circuit for full-voltage linear constant-power LED lamp

Through the working circuit of the full-voltage linear constant power LED lamp, the series and parallel connection of the LED lamp beads is controlled by using the full-voltage linear chip and MOS tube, which solves the voltage adaptability and EMI problems, and realizes constant power output under different voltage environments and reduces connection complexity.

CN223194871UActive Publication Date: 2025-08-05NINGBO UTEC ELECTRIC CO LTD
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Patent Information

Application Number
CN202422314843.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-23
Publication Date
2025-08-05
Estimated Expiration
2034-09-23

AI Technical Summary

Technical Problem

Existing LED lamp operating circuits have limitations in voltage adaptability and are only applicable to a specific range of voltages, limiting their global market adaptability, and traditional switching power supplies have connection troubles, high costs and EMI problems.

Method used

The working circuit of the full-voltage linear constant power LED lamp is adopted, and the power supply circuit, LED power supply circuit and LED circuit are used to control the series-parallel relationship of the LED lamp beads through a full-voltage linear chip, combining the MOS tube and the rectifier bridge to achieve voltage adaptability, and using the full-voltage linear chip to achieve automatic adjustment of the input power.

Benefits of technology

The constant power output of LED lamps under different voltage environments is realized, which improves voltage adaptability, reduces connection complexity and cost, and reduces EMI interference.

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Abstract

The utility model relates to a working circuit for a full-voltage linear constant power LED lamp, which comprises a power supply circuit, an LED power supply circuit and an LED circuit, the power supply circuit converts alternating current into direct current and supplies the direct current to the LED power supply circuit, the LED power supply circuit controls the LED circuit to work through a full-voltage linear chip, the full-voltage linear chip detects input voltage, and the full-voltage linear chip detects the output voltage. When the detected voltage is smaller than the set threshold voltage, the LED lamp sets are connected in parallel, and when the detected voltage is larger than the set threshold voltage, the LED lamp sets are connected in series, namely, according to different input voltages, the full-voltage linear chip controls the LED lamp beads to change series-parallel connection to achieve constant power.
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Description

Technical Field

[0001] The utility model belongs to the field of lighting circuits, and in particular relates to a working circuit for a full-voltage linear constant-power LED lamp. Background Art

[0002] Existing operating circuits for LED lamps are limited in voltage adaptability, typically operating only within a specific voltage range, such as 120V or 220V. This restricts their adaptability in the global market. Furthermore, traditional switching power supplies often utilize electrolytic capacitors and multiple circuit boards, resulting in complex connections, high costs, and EMI (electromagnetic interference) issues. These issues hinder the widespread adoption of LED lamps, particularly in industrial and outdoor environments where high reliability and long life are crucial. Utility Model Content

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, thereby providing a working circuit for a full-voltage linear constant-power LED lamp.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A working circuit for a full-voltage linear constant-power LED lamp includes a power supply circuit, an LED power supply circuit, and an LED circuit. The power supply module is composed of a resistor 1, a resistor 2, a resistor 9, a varistor 2, a rectifier bridge, a diode 1, a diode 3, a diode 4, a capacitor 4, a MOS tube, and a voltage-stabilizing diode. One end of the resistor 1 is connected to the live wire, one end of the resistor 2 is connected to the neutral wire, the other end of the resistor 1 and one end of the varistor 2 are connected to pin 4 of the rectifier bridge, the other end of the resistor 2 and the other end of the varistor 2 are connected to pin 2 of the rectifier bridge, the cathode of the diode, one end of the resistor 9, and pin 2 of the MOS tube are connected to pin 1 of the rectifier bridge, the positive electrode of the diode 4, the negative electrode of the voltage-stabilizing diode, and one end of the capacitor 4 are connected to pin 1 of the MOS tube, and the voltage-stabilizing diode. The positive electrode of the diode, the other end of capacitor four, and the positive electrode of diode three are connected to pin 3 of the MOS tube, and pin 3 of the rectifier bridge is grounded; the LED power supply circuit is composed of resistor three, resistor four, resistor five, resistor six, resistor seven, resistor eight, resistor ten, capacitor one, capacitor two, capacitor three, capacitor five, capacitor six, capacitor seven, varistor three, varistor four, varistor five, varistor six, and a full-voltage linear chip, among which one end of resistor three and one end of resistor eleven are connected to pin 1 of the rectifier bridge, one end of capacitor two and the negative electrode of diode four are connected to pin 1 of the full-voltage linear chip, one end of resistor eight is connected to pin 2 of the full-voltage linear chip, the other end of resistor eight and one end of capacitor three are connected to pin 3 of the full-voltage linear chip, one end of capacitor one, one end of resistor four, and resistor The fifth end is connected to the 6th pin of the full-voltage linear chip, the sixth end of the resistor is connected to the 7th pin of the full-voltage linear chip, the seventh end of the resistor is connected to the 8th pin of the full-voltage linear chip, the seventh end of the capacitor and the third end of the varistor are connected to the 9th pin of the full-voltage linear chip, the fifth end of the varistor and the sixth end of the capacitor are connected to the 10th pin of the full-voltage linear chip, the fourth end of the varistor is connected to the 14th pin of the full-voltage linear chip, the sixth end of the varistor is connected to the 15th pin of the full-voltage linear chip, the other end of the resistor ten and the fifth end of the capacitor are connected to the 16th pin of the full-voltage linear chip, the other end of the resistor three is connected to the other end of the resistor four, the other end of the resistor five, the other end of the capacitor one, the other end of the capacitor two, the other end of the capacitor three, the other end of the resistor six, the other end of the resistor seven, the other end of the capacitor seven, and the varistor three The other end, the other end of varistor five, the other end of capacitor six, the other end of varistor four, the other end of capacitor five, and the other end of varistor six are grounded respectively; the LED module consists of LED lamp one, LED lamp two, LED lamp three, LED lamp four, and diode two, among which the positive pole of LED lamp one is connected to pin 1 of the rectifier bridge, the negative pole of LED lamp one and the positive pole of LED lamp two are connected to pin 15 of the full-voltage linear chip, the negative pole of LED lamp two and the positive pole of diode two are connected to pin 14 of the full-voltage linear chip, the negative pole of diode three and the negative pole of diode two are connected to the positive pole of diode three, the negative pole of diode three and the positive pole of diode four are connected to pin 10 of the full-voltage linear chip, and the negative pole of diode four and the positive pole of diode one are connected to pin 9 of the full-voltage linear chip.

[0006] Preferably, the full-voltage linear chip is ZX6199EPT.

[0007] Preferably, the MOS tube is 2N65.

[0008] Compared with the prior art, the present invention has the following advantages and effects:

[0009] 1) A rectifier bridge is used to convert AC power into DC power to power the working circuit. When the voltage detection port detects that the input voltage is less than the preset voltage, the MOS tube is turned on and two sections of series lamp beads (LED lamp 1 and LED lamp 3 are connected in series, and LED lamp 2 and LED lamp 4 are connected in series) are connected in parallel. When the input voltage is greater than the preset voltage, the MOS tube is turned off and the four sections of LED lamps are connected in series. That is, according to different input voltages, the full-voltage linear chip can control the LED lamp beads to change the series and parallel connection to achieve constant power.

[0010] 2) The full-voltage linear chip has the function of automatic input power adjustment. The built-in resistor sets the input constant power and can monitor the input voltage in real time to achieve the input constant power effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of a circuit of an embodiment of the utility model.

[0012] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application. DETAILED DESCRIPTION

[0013] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0014] Example

[0015] like Figure 1As shown, this embodiment includes a power supply circuit, an LED power supply circuit, and an LED circuit. The power supply circuit converts AC power into DC power and supplies the DC power to the LED power supply circuit. The power supply module consists of resistor R1, resistor R2, resistor R9, varistor MOV2, rectifier bridge DB1, diode D1, diode D3, diode D4, capacitor C4, MOS tube Q1, and Zener diode ZD1. One end of resistor R1 is connected to the live wire, one end of resistor R2 is connected to the neutral wire, the other end of resistor R1 and one end of varistor MOV2 are connected to pin 4 of rectifier bridge DB1, the other end of resistor R2 and the other end of varistor MOV2 are connected to pin 2 of rectifier bridge DB1, the cathode of diode R9, one end of resistor R9, and pin 2 of MOS tube Q1 are connected to pin 1 of rectifier bridge DB1, the positive electrode of diode D4, the negative electrode of Zener diode ZD1, and one end of capacitor C4 are connected to pin Q11 of MOS tube, the positive electrode of Zener diode ZD1, the other end of capacitor C4, and the positive electrode of diode D3 are connected to pin Q13 of MOS tube, and pin 3 of rectifier bridge DB1 is grounded.

[0016] like Figure 1As shown, the LED power supply circuit consists of resistor three R3, resistor four R4, resistor five R5, resistor six R6, resistor seven R7, resistor eight R8, resistor ten R10, capacitor one C1, capacitor two C2, capacitor three C3, capacitor five C5, capacitor six C6, capacitor seven C7, varistor three MOV3, varistor four MOV4, varistor five MOV5, varistor six MOV6, and full-voltage linear chip U1, wherein one end of resistor three R3 and one end of resistor ten R10 are connected to pin 1 of rectifier bridge DB1, one end of capacitor two C2 and the negative electrode of diode four D4 are connected to pin 1 of full-voltage linear chip U1, one end of resistor eight R8 is connected to pin 2 of full-voltage linear chip U1, the other end of resistor eight R8 and one end of capacitor three C3 are connected to pin 3 of full-voltage linear chip U1, one end of capacitor one C1, one end of resistor four R4, and one end of resistor five R5 are connected to full-voltage linear chip U1 Pin 6, one end of resistor R6 is connected to the full-voltage linear chip U1 Pin 7, one end of resistor R7 is connected to the full-voltage linear chip U1 Pin 8, one end of capacitor C7 and one end of varistor MOV3 are connected to the full-voltage linear chip U1 Pin 9, one end of varistor MOV5 and one end of capacitor C6 are connected to the full-voltage linear chip U1 Pin 10, one end of varistor MOV4 is connected to the full-voltage linear chip U1 Pin 14, one end of varistor MOV6 is connected to the full-voltage linear chip U1 Pin 15, the other end of resistor R10 and one end of capacitor C5 are connected to the full-voltage linear chip U1 Pin 16, the other end of resistor 3 R3 is connected to the other end of resistor 4 R4, the other end of resistor 5 R5, the other end of capacitor 1 C1, the other end of capacitor 2 C2, the other end of capacitor 3 C3, the other end of resistor 6 R6, the other end of resistor 7 R7, the other end of capacitor 7 C7, the other end of varistor 3 MOV3, the other end of varistor 5 MOV5, the other end of capacitor 6 C6, the other end of varistor 4 MOV4, the other end of capacitor 5 C5, and the other end of varistor 6 MOV6 are grounded respectively.

[0017] like Figure 1 As shown, the LED module consists of LED lamp 1 LED1, LED lamp 2 LED2, LED lamp 3 LED3, LED lamp 4 LED4, and diode 2 D2, among which the positive pole of LED lamp 1 LED1 is connected to pin 1 of rectifier bridge DB1, the negative pole of LED lamp 1 LED1 and the positive pole of LED lamp 2 LED2 are connected to pin 15 of full-voltage linear chip U1, the negative pole of LED lamp 2 LED2 and the positive pole of diode 2 D2 are connected to pin 14 of full-voltage linear chip U1, the negative pole of diode 3 D3 and the negative pole of diode 2 D2 are connected to the positive pole of diode 3 D3, the negative pole of diode 3 D3 and the positive pole of diode 4 D4 are connected to pin 10 of full-voltage linear chip U1, and the negative pole of diode 4 D4 and the positive pole of diode 1 D1 are connected to pin 9 of full-voltage linear chip U1.

[0018] In the above operating circuit, pin 1 (SPC) of the full-voltage linear chip U1 is connected to MOS transistor Q1, which acts as a switch. Depending on the input voltage, pin 1 (SPC) of the full-voltage linear chip U1 controls the series / parallel connection of the LED string (LED 1, LED 2, LED 3, and LED 4). Pin 2 (PWM) of the full-voltage linear chip U1 turns the LEDs on when it receives a high level, and turns them off when it receives a low level. Resistor R8 is connected to pin 3 (VDD) of the full-voltage linear chip U1 and maintains a high level to disable the light-control function. Pins 6 and 11 (VBS) of the full-voltage linear chip U1 detect the input voltage. A threshold voltage of 1.2V is internally set on the VBS pin. The input voltage corresponding to the switching point between the series and parallel connection of the two series-connected LEDs is set by adjusting the ratio of pull-up resistors R3, R4, and R5. The specific formula is as follows: R5 / (R3+R4+R5)*VAC*1.414=1.2. When the voltage detected by pins 6 and 11 (VBS) of the full-voltage linear chip U1 is lower than the set threshold voltage, pin 1 (SPC) of the full-voltage linear chip U1 is turned off, MOSFET Q1 is turned on, and the two series-connected LEDs are connected in parallel. When the voltage detected by pins 6 and 11 (VBS) of the full-voltage linear chip U1 is higher than the set threshold voltage, pin 1 (SPC) of the full-voltage linear chip U1 pulls down current, MOSFET Q1 is turned off, and the two series-connected LEDs are connected in series. Pin 7 (CS1) and pin 8 (CS2) of the full-voltage linear chip U1 are both current sampling terminals, connected to sampling resistors R6 and R7, respectively, to control the average output current. Pin 16 (VIN) of the full-voltage linear chip U1 is the power supply pin for the full-voltage linear chip U1. It connects to rectifier bridge DB1 through resistor R10 to provide power to the chip.

[0019] In this embodiment, the full voltage linear chip U1 is ZX6199EPT, and the MOS transistor Q1 is 2N65.

[0020] The above contents described in this specification are merely examples of the present invention. Those skilled in the art of the present invention may make various modifications, additions, or substitute similar methods to the specific embodiments described, as long as they do not deviate from the contents of this specification or exceed the scope defined by the claims, and shall fall within the scope of protection of the present invention.

Claims

1. A working circuit for a full-voltage linear constant-power LED lamp, comprising a power supply circuit, an LED power supply circuit, and an LED circuit, characterized in that: The power supply module consists of resistor 1, resistor 2, resistor 9, varistor 2, rectifier bridge, diode 1, diode 3, diode 4, capacitor 4, MOS tube, and voltage regulator diode. One end of resistor 1 is connected to the live wire, one end of resistor 2 is connected to the neutral wire, the other end of resistor 1 and one end of varistor 2 are connected to pin 4 of the rectifier bridge, the other end of resistor 2 and the other end of varistor 2 are connected to pin 2 of the rectifier bridge, the cathode of the diode, one end of resistor 9, and pin 2 of the MOS tube are connected to pin 1 of the rectifier bridge, the positive electrode of diode 4, the negative electrode of the voltage regulator diode, and one end of capacitor 4 are connected to pin 1 of the MOS tube, the positive electrode of the voltage regulator diode, the other end of capacitor 4, and the positive electrode of diode 3 are connected to pin 3 of the MOS tube, and pin 3 of the rectifier bridge is grounded. The LED power supply circuit is composed of resistor 3, resistor 4, resistor 5, resistor 6, resistor 7, resistor 8, resistor 10, capacitor 1, capacitor 2, capacitor 3, capacitor 5, capacitor 6, capacitor 7, varistor 3, varistor 4, varistor 5, varistor 6, and a full-voltage linear chip. One end of resistor 3 and one end of resistor 11 are connected to pin 1 of the rectifier bridge, one end of capacitor 2 and the negative electrode of diode 4 are connected to pin 1 of the full-voltage linear chip, one end of resistor 8 is connected to pin 2 of the full-voltage linear chip, the other end of resistor 8 and one end of capacitor 3 are connected to pin 3 of the full-voltage linear chip, one end of capacitor 1, one end of resistor 4, and one end of resistor 5 are connected to pin 6 of the full-voltage linear chip, one end of resistor 6 is connected to pin 7 of the full-voltage linear chip, and one end of resistor 7 is connected to the full-voltage linear chip. Pin 8 of the chip, one end of capacitor 7 and one end of varistor 3 are connected to pin 9 of the full-voltage linear chip, one end of varistor 5 and one end of capacitor 6 are connected to pin 10 of the full-voltage linear chip, one end of varistor 4 is connected to pin 14 of the full-voltage linear chip, one end of varistor 6 is connected to pin 15 of the full-voltage linear chip, the other end of resistor 10 and one end of capacitor 5 are connected to pin 16 of the full-voltage linear chip, the other end of resistor 3 is connected to the other end of resistor 4, the other end of resistor 5, the other end of capacitor 1, the other end of capacitor 2, the other end of capacitor 3, the other end of resistor 6, the other end of resistor 7, the other end of capacitor 7, the other end of varistor 3, the other end of varistor 5, the other end of capacitor 6, the other end of varistor 4, the other end of capacitor 5, and the other end of varistor 6 are grounded respectively; The LED module consists of LED lamp 1, LED lamp 2, LED lamp 3, LED lamp 4, and diode 2. The positive pole of LED lamp 1 is connected to pin 1 of the rectifier bridge, the negative pole of LED lamp 1 and the positive pole of LED lamp 2 are connected to pin 15 of the full-voltage linear chip, the negative pole of LED lamp 2 and the positive pole of diode 2 are connected to pin 14 of the full-voltage linear chip, the negative pole of diode 3 and the negative pole of diode 2 are connected to the positive pole of diode 3, the negative pole of diode 3 and the positive pole of diode 4 are connected to pin 10 of the full-voltage linear chip, and the negative pole of diode 4 and the positive pole of diode 1 are connected to pin 9 of the full-voltage linear chip.

2. The operating circuit for a full-voltage linear constant-power LED lamp according to claim 1, characterized in that: The full voltage linear chip is ZX6199EPT.

3. The operating circuit for a full-voltage linear constant-power LED lamp according to claim 1, characterized in that: The MOS tube is 2N65.