Constant power output control device of sine wave LED emergency power supply

Abstract

The invention discloses a constant power output control device for a sine wave LED emergency power supply, which mainly collects voltage and current values output by the emergency power supply in real time through an electric energy metering chip, calculates and converts the voltage and current values into output power values, transmits the output power values to an MCU control chip, compares the output power values with standard power values preset by the MCU control chip in advance, calculates the required duty ratio, and controls the constant power output of the sine wave LED emergency power supply. According to the invention, the duty ratio signal calculated and output by the MCU is converted into the analog voltage of 0-10V through the two in-phase amplifiers to control the emergency output power of the lamp, so that the complexity of power adjustment is simplified, the accuracy and response speed of adjustment are improved, and the power output to the LED lamp is ensured to be unchanged, namely, the constant power output is maintained. The emergency power supply can be ensured to keep constant output power under various load conditions, so that accurate control of the output power of the LED emergency power supply is realized.

Description

Technical Field

[0001] This invention relates to the field of emergency power supply technology, and in particular to a constant power output control device for a sinusoidal LED emergency power supply. Background Technology

[0002] Emergency power supplies play a crucial role in emergency scenarios. By providing temporary power, they can supply power to many devices and ensure their normal operation. LED lights are one such device that benefits from emergency power supplies. When LED lights encounter a power outage or circuit break, the emergency power source will immediately switch from standby mode to power supply mode to provide power to the LED lights.

[0003] Currently, the control of emergency power supply output mainly focuses on how to deliver power from the emergency power supply to LED lights. However, it is difficult to regulate the output power of the emergency power supply to maintain a constant power output, thereby ensuring the stable operation of the LED lights and preventing the LED lights from flickering due to fluctuations in the output power of the emergency power supply. Therefore, a more reasonable emergency power supply control circuit is urgently needed to solve the above-mentioned technical problems. Summary of the Invention

[0004] To address the shortcomings of the aforementioned technologies, where the power output of emergency power supplies is prone to fluctuations, causing LED lights to be unable to maintain a constant power output, this invention provides a sinusoidal LED emergency power supply constant power output control device.

[0005] To achieve the above objectives, the present invention provides a constant power output control device for a sinusoidal LED emergency power supply, and an energy metering chip control circuit, which is used to collect the current and voltage values ​​of the emergency power supply, calculate the output power value of the emergency power supply, save it to an internal register, and then send it to the MCU control chip. The MCU control circuit reads the output power value, compares the output power value with a preset standard power value, and determines whether the output power value is equal to the standard power value. If so, the current output power value is maintained and continuously output; if not, the output power value is adjusted to be the same as the standard power value, and then the output power value is maintained at the standard power value.

[0006] A dimming control circuit is used to adjust the output power value to control the power value of the lamp.

[0007] As an improvement of the present invention, the MCU control circuit includes an MCU control chip, the power metering chip control circuit includes a power metering chip, the power metering chip includes a circuit protection pin, a voltage acquisition pin, and a voltage protection pin, the circuit protection pin and the current acquisition pin are connected to the LED lamp to acquire the voltage and current information output by the LED lamp and calculate the output power value of the emergency power supply.

[0008] As an improvement of the present invention, the power metering chip control circuit includes a detection signal transmission pin and a detection signal receiving pin. The detection signal transmission pin and the detection signal receiving pin are respectively connected to the frequency modulation signal receiving pin and the frequency modulation signal transmitting pin of the MCU control chip, and are used to send the output power value to the MCU control chip. After receiving the value, the MCU control chip compares it with the standard power value to generate the actual power value.

[0009] As an improvement of the present invention, it further includes a driving circuit and a full-bridge inverter circuit. The driving circuit includes a first driving chip and a second driving chip. The first frequency modulation input pin and the second frequency modulation input pin of the first driving chip and the third frequency modulation input pin and the fourth frequency modulation input pin of the second driving chip are respectively coupled to the first control signal pin, the second control signal pin, the third control signal pin and the fourth control signal pin of the MCU control chip. The first frequency modulation output pin and the second frequency modulation output pin of the first driving chip and the third frequency modulation output pin and the fourth frequency modulation output pin of the second driving chip are connected to the full-bridge inverter circuit. The first driving chip and the second driving chip are used to drive the full-bridge inverter circuit to output a 120V sine wave voltage to the LED lamp and the power metering chip.

[0010] As an improvement of the present invention, the full-bridge inverter circuit includes a first MOSFET, a second MOSFET, a third MOSFET, and a fourth MOSFET. The sources of the first MOSFET and the second MOSFET, and the drain of the third MOSFET are jointly coupled to the first driving pin of the first driving chip. The fourth MOSFET is connected to the second driving pin of the second driving chip. The drains of the first MOSFET and the second MOSFET are jointly coupled to a 400V input voltage and a gate. The sources of the third MOSFET and the fourth MOSFET are jointly coupled to ground. The gates of the first MOSFET, the second MOSFET, the third MOSFET, and the fourth MOSFET are respectively coupled to the first frequency modulation output pin, the third frequency modulation output pin, the second frequency modulation output pin, and the fourth frequency modulation output pin. The first driving pin and the second driving pin pass through the first common-mode inductor and the second common-mode inductor in sequence, and output a 120V AC live wire and a 120V AC neutral wire.

[0011] As an improvement of the present invention, the voltage protection pin is coupled to the 120V AC live wire, and the circuit protection pin and the voltage acquisition pin are coupled to the 120V AC neutral wire.

[0012] As an improvement of the present invention, the dimming control circuit includes a first non-inverting amplifier and a second non-inverting amplifier. The non-inverting input terminal of the first non-inverting amplifier is coupled to the pulse width modulation pin of the MCU control chip, the inverting input terminal is coupled to ground, and the output terminal is coupled to the non-inverting input terminal of the second amplifier. The inverting input terminal and the output terminal of the second amplifier are coupled to the positive dimming pin, which is connected to the LED lamp. The MCU control chip calculates and controls the duty cycle of the pulse width modulation pin based on the comparison between the output power value and the standard power value, so as to output the standard power value to the LED lamp through the positive dimming pin.

[0013] As an improvement of the present invention, a first resistor, a second resistor, and a third resistor are connected sequentially between the non-inverting input terminal of the first non-inverting amplifier and the pulse width modulation pin. A first capacitor and a second capacitor are connected to the two ends of the second resistor, respectively. The first capacitor and the second capacitor are coupled to ground. A fourth resistor, a fifth resistor, and a third capacitor are also provided between the second non-inverting amplifier and the positive dimming pin. The fifth resistor and the third capacitor are both connected to ground.

[0014] As an improvement of the present invention, it further includes an optocoupler isolation circuit, which includes a first optocoupler and a second optocoupler. The input terminal of the first optocoupler is coupled to VDDBL and the detection signal transmission pin of the power metering chip, and the output terminal is coupled to 3.3V voltage and the frequency modulation signal receiving pin of the MCU control chip. The input terminal of the second optocoupler is 3.3V voltage and the frequency modulation signal transmission pin of the MCU control chip, and the output terminal is coupled to VDDBL and the detection signal receiving pin of the power metering chip.

[0015] As an improvement of the present invention, the first optocoupler includes a first light-emitting diode and a first photodiode. The positive terminal of the first light-emitting diode is connected to one end of a sixth resistor, the other end of the sixth resistor is connected to VDDBL, and the negative terminal is connected to the detection signal transmission pin. The positive terminal of the first photodiode is connected to the frequency modulation signal receiving pin and a +3.3V voltage, and the negative terminal is coupled to ground. A seventh resistor is also connected between the positive terminal of the first photodiode and the +3.3V voltage. The second optocoupler includes a second light-emitting diode and a second photodiode. The positive terminal of the second light-emitting diode is connected to one end of an eighth resistor, the other end of the eighth resistor is connected to VDDBL, and the negative terminal is connected to the frequency modulation signal transmitting pin. The positive terminal of the second photodiode is coupled to the detection signal receiving pin and one end of a ninth resistor, the other end of the ninth resistor is connected to VDDBL, and the negative terminal is connected to ground.

[0016] The beneficial effects of this invention are as follows: Compared with the prior art, this invention provides a constant power output control device for a sinusoidal LED emergency power supply. This invention mainly uses an energy metering chip to collect the voltage and current values ​​output by the emergency power supply in real time, and calculates and converts them into output power values ​​for the MCU control chip. By comparing the output power value with the standard power value preset by the MCU control chip, the required duty cycle is calculated to ensure that the power output to the LED lamp remains unchanged, i.e., constant power output is maintained. This invention mainly uses two in-phase amplifiers to convert the duty cycle signal calculated by the MCU into a 0-10V analog voltage to control the emergency output power of the lamp. This not only simplifies the complexity of power adjustment, but also improves the accuracy and response speed of adjustment, ensuring that the emergency power supply can maintain a constant output power under various load conditions, thereby achieving precise control of the output power of the LED emergency power supply. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall circuit connection of the present invention; Figure 2 This is a schematic diagram of the power metering chip of the present invention; Figure 3 This is a schematic diagram of the optocoupler isolation circuit of the present invention; Figure 4 This is a schematic diagram of the dimming control circuit of the present invention; Figure 5 This is a schematic diagram of the MCU control chip circuit of the present invention; Figure 6 This is a schematic diagram of the full-bridge inverter circuit of the present invention; Figure 7 This is a schematic diagram of the driving circuit of the present invention. Detailed Implementation

[0018] To more clearly illustrate the present invention, the invention will be further described below with reference to the accompanying drawings.

[0019] In the following description, specific examples are given to provide a more in-depth understanding of the invention. It is obvious that the described embodiments are merely some, not all, of the embodiments of the invention. It should be understood that the specific embodiments described are for illustrative purposes only and are not intended to limit the scope of the invention.

[0020] It should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the said feature, integral, step, operation, element, or component, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, or combinations thereof.

[0021] Please see Figures 1-7 The present invention provides a constant power output control device for a sinusoidal LED emergency power supply, comprising: The power metering chip control circuit is used to collect the current and voltage values ​​of the emergency power supply, calculate the output power value of the emergency power supply, save it to the internal register, and then send it to the MCU control chip U11. The MCU control circuit reads the output power value and compares it with the preset power value. If the output power value is equal to the preset power value, it maintains the current output power value and continues to output; otherwise, it adjusts the output power value to be the same as the preset power value and then maintains the preset power value for output.

[0022] The dimming control circuit is used to adjust the output power value to control the power value of the lamp.

[0023] The power metering chip control circuit collects the current and voltage values ​​of the emergency power supply in real time, calculates the corresponding output power value, saves the output power value to an internal register, and then sends it to the MCU control chip U11. The MCU control chip U11 presets a standard power value. When it receives the output power value sent by the power metering chip control circuit, it compares it with the standard power value to determine whether the output power value is equal to the standard power value. If it is, it maintains the current output power value and continues to output to the LED lights without adjustment; if not, it adjusts the output power value of the emergency power supply to be equal to the standard power value through the dimming control circuit, and maintains the standard power value for continuous output, thereby achieving constant power output to the LED lights by the overall circuit.

[0024] In this embodiment, the MCU control circuit includes an MCU control chip U11, and the power metering chip control circuit includes a power metering chip U4. The power metering chip U4 includes a circuit protection pin (corresponding to pin 4 of the power metering chip U4) and a current acquisition pin (corresponding to pin 2 of the power metering chip U4). The circuit protection pin and the current acquisition pin are connected to the emergency power supply to acquire the voltage and current information output by the emergency power supply and calculate the output power value of the emergency power supply. Through the circuit protection pin and the current acquisition pin, the power metering chip U4 can obtain the voltage and current data output by the emergency power supply in real time and accurately. After these data are processed by the internal calculation unit of the power metering chip U4, the current output power value of the emergency power supply can be obtained. This output power value is stored in the internal register of the power metering chip U4 and then sent to the MCU control chip U11 for further processing and judgment to confirm whether the current output power value is constant.

[0025] In this embodiment, the power metering chip control circuit includes a first communication pin (corresponding to pin 10 of power metering chip U4) and a second communication pin (corresponding to pin 9 of power metering chip U4). The first and second communication pins are respectively connected to the frequency modulation signal receiving pin (corresponding to pin 13 of MCU control chip U11) and the frequency modulation signal transmitting pin (corresponding to pin 12 of MCU control chip U11), used to send the output power value to MCU control chip U11. After receiving the value, MCU control chip U11 compares it with the standard power value to generate the actual power. The power metering chip U4 transmits the output power value data to the MCU control chip U11 through the first and second communication pins. The actual power value is compared with the standard power value. If the actual power value is less than the standard power value, the MCU control chip U11 will send a command to increase the output power to the dimming control circuit; if the actual power value is greater than the standard power value, the MCU control chip U11 will send a command to decrease the output power. Through this two-way communication and control mechanism, it is ensured that the output power of the emergency power supply can be quickly and accurately adjusted to the preset standard power value, thereby realizing constant power supply for LED lights.

[0026] In this embodiment, a driving circuit and a full-bridge inverter circuit are also included. The driving circuit includes a first driving chip U7 and a second driving chip U9. The first and second frequency modulation input pins of the first driving chip U7 (corresponding to pins 2 and 3 of the first driving chip U7) and the third and fourth frequency modulation input pins of the second driving chip U9 (corresponding to pins 2 and 3 of the second driving chip U9) are respectively coupled to the first, second, third, and fourth control signal pins of the MCU control chip U4 (corresponding to pins 30, 27, 29, and 26 of the MCU control chip U11). The first driving chip U7... The first and second frequency modulation output pins (corresponding to pins 7 and 5 of the first driver chip U7) and the third and fourth frequency modulation output pins of the second driver chip U9 (corresponding to pins 7 and 5 of the second driver chip U9) are connected to the full-bridge inverter circuit. The first driver chip U7 and the second driver chip U9 are used to drive the full-bridge inverter circuit to output a 120V sine wave voltage to the LED lamps and the power metering chip U4. After receiving the control signal from the MCU control chip U4, the first driver chip U7 and the second driver chip U9 respectively adjust the signal of their frequency modulation input pins, thereby controlling the frequency and duty cycle of the output voltage of the full-bridge inverter circuit to generate a stable 120V sine wave voltage.

[0027] Furthermore, the full-bridge inverter circuit includes Q14, Q15, Q16, and Q17. The sources of Q14 and Q15, and the drain of Q16 are commonly coupled to the first driving pin of the first driving chip U7. Q17 is connected to the second driving pin of the second driving chip U9. The drains of Q14 and the second MOS switch are commonly coupled to the 400V input voltage and their gates. The sources of Q16 and Q17 are commonly coupled to ground. The gates of Q14, Q15, Q16, and Q17 are respectively coupled to the first, third, second, and fourth frequency modulation output pins. The first driving pin and the second driving pin... The circuit sequentially passes through a first common-mode inductor and a second common-mode inductor, outputting a 120V AC live wire and a 120V AC neutral wire to provide a stable operating voltage to the LED lighting fixture. In this embodiment, the full-bridge inverter circuit converts the DC voltage into an AC sine wave voltage through the switching action of four MOSFETs, and filters it through the common-mode inductor to output a smooth and stable 120V sine wave voltage. This ensures that the LED lighting fixture can maintain a stable operating state when powered by an emergency power supply, avoiding problems such as flickering or instability of the light source due to voltage fluctuations, and further improving the reliability and stability of emergency lighting.

[0028] In this embodiment, the voltage protection pin is coupled to the 120V AC live wire, and the circuit protection pin and voltage acquisition pin are coupled to the 120V AC neutral wire. The power metering chip U4 acquires the current and voltage output from the full-bridge inverter circuit to the LED lamp, calculates and converts them into the corresponding output power, and sends them to the MCU control chip U4.

[0029] In this embodiment, the dimming control circuit includes a first non-inverting amplifier U16B and a second non-inverting amplifier U16A. The non-inverting input of the first non-inverting amplifier U16B is coupled to the pulse width modulation (PWM) pin (pin 28) of the MCU control chip U11, the inverting input is coupled to ground, and the output is coupled to the non-inverting input of the second amplifier. The inverting input and output of the second amplifier are coupled to the positive dimming pin DIM+. The MCU control chip U11 can send an adjustment signal to the first non-inverting amplifier U16B through the PWM pin. The first non-inverting amplifier U16B adjusts the dimming signal according to the duty cycle of the PWM pin. The frequency modulation signal sent by the device is adjusted to an analog voltage of 0-10V, and then the strength of the analog voltage signal is controlled by the second non-inverting amplifier U16A. The second non-inverting amplifier U16A is responsible for further amplifying the signal and outputting the amplified signal to the output terminal of the emergency power supply, thereby realizing fine adjustment of the output power. By setting two non-inverting amplifiers to progressively adjust the output power, the complexity of power adjustment is simplified, and the accuracy and response speed of adjustment are improved, ensuring that the emergency power supply can maintain a constant output power under various load conditions. After the power is adjusted by the amplifier, it is input to the LED lamp through the positive dimming pin DIM+.

[0030] The first in-phase amplifier receives the frequency modulation signal from the MCU control chip U11 and adjusts it to an analog voltage of 0-10V based on the duty cycle signal output by the main control chip U11. This duty cycle-adjusted signal further affects the input of the second in-phase amplifier U16A. The second in-phase amplifier U16A then amplifies or attenuates the sinusoidal signal (i.e., voltage magnitude) output to the emergency power supply based on the adjusted analog voltage, ultimately achieving constant control of the LED lamp's output power. The dual adjustment mechanism of the two in-phase amplifiers ensures that the power received by the LED lamp remains stable even when the emergency power supply output voltage or load changes, greatly improving the reliability and stability of emergency lighting.

[0031] Furthermore, a first resistor R102, a second resistor R121, and a third resistor R111 are sequentially connected between the non-inverting input terminal of the first non-inverting amplifier U16B and the pulse width modulation (PWM) pin. A first capacitor C76 and a second capacitor C77 are connected to the two ends of the second resistor, respectively. The first and second capacitors are coupled to ground, further stabilizing the input signal of the first non-inverting amplifier U16B. The first, second, and third resistors form a voltage divider circuit, allowing the PWM signal output by the MCU control chip U11 to be appropriately attenuated before being input to the non-inverting input terminal of the first non-inverting amplifier U16B. This avoids amplification distortion caused by excessively large or small signals. Simultaneously, the first and second capacitors connected to the two ends of the second resistor form a filter circuit, effectively filtering out high-frequency noise and interference signals, ensuring a pure and stable signal input to the first non-inverting amplifier U16B, thereby improving the output stability and reliability of the entire emergency power supply.

[0032] In this embodiment, a fourth resistor R136, a fifth resistor R137, and a third capacitor C78 are provided between the second non-inverting amplifier U16A and the positive dimming pin DIM+. Both the fifth resistor and the third capacitor are connected to ground. The fourth resistor acts as a voltage divider resistor, working together with the fifth resistor to perform appropriate voltage division processing on the signal from the second non-inverting amplifier U16A. The third capacitor plays a filtering role, which can effectively filter out high-frequency noise in the signal, ensuring that the signal transmitted to DIM+ is pure and stable, and ensuring that the signal output to the positive dimming pin DIM+ is smooth, stable, and free of high-frequency noise.

[0033] In this embodiment, an optocoupler isolation circuit is also included. This circuit comprises a first optocoupler U12 and a second optocoupler U13. The input terminal of the first optocoupler U12 is coupled to VDDBL and the detection signal transmission pin of the power metering chip U4, and its output terminal is coupled to a 3.3V voltage and the frequency modulation signal receiving pin of the MCU control chip U11. The input terminal of the second optocoupler U13 is the 3.3V voltage and the frequency modulation signal transmitting pin of the MCU control chip U11, and its output terminal is coupled to VDDBL and the detection signal receiving pin of the power metering chip U4. The optocoupler isolation circuit is mainly used to enhance the stability and anti-interference capability of the overall circuit. The first optocoupler U12 serves as the signal transmission front end, and its input terminal receives detection signals from the digital ground voltage VDDBL and the power metering chip U4. These signals reflect the operating status of the LED emergency power supply, such as key parameters like voltage and current. Through the isolation provided by the optocoupler, voltage and current signals are safely and reliably transmitted to the MCU control chip U11. The MCU control chip U11 then receives the signals through its frequency modulation signal receiving pin. During this process, 3.3V is used as the operating voltage to ensure the normal operation of the optocoupler isolation circuit. The second optocoupler U13 acts as a reverse isolation device. Its input is connected to the frequency modulation signal receiving pin of the MCU control chip U11, and its output is returned to VDDBL and the detection signal receiving pin of the power metering chip U4, forming a closed-loop feedback system. This allows the MCU control chip U11 to adjust its output power in real time according to the received signals, while ensuring that these adjustment signals are not affected by external interference, further improving the stability and accuracy of the system.

[0034] In this embodiment, the first optocoupler U12 includes a first light-emitting diode (LED) and a first photodiode. The positive terminal of the first LED is connected to one end of a sixth resistor R122, and the other end of the sixth resistor is connected to VDDBL. The negative terminal is connected to the detection signal transmission pin. The positive terminal of the first photodiode is connected to the frequency modulation signal receiving pin and a +3.3V voltage, and the negative terminal is coupled to ground. A seventh resistor R1 is also connected between the positive terminal of the first photodiode and the +3.3V voltage. The sixth resistor acts as a current limiter to protect the first LED from excessive current. The seventh resistor acts as a pull-up resistor to ensure that the first photodiode can conduct stably when it receives an optical signal and accurately transmit the signal to the frequency modulation signal receiving pin.

[0035] In this embodiment, the second optocoupler includes a second light-emitting diode (LED) and a second photodiode. The positive terminal of the second LED is connected to one end of an eighth resistor, the other end of the eighth resistor is connected to VDDBL, and the negative terminal is connected to the FM signal transmitting pin. The positive terminal of the second photodiode is coupled to the detection signal receiving pin and one end of a ninth resistor, the other end of the ninth resistor is connected to VDDBL, and the negative terminal is connected to ground. The eighth resistor also serves as a current limiter, protecting the second LED from damage caused by excessive current. The ninth resistor acts as a voltage divider resistor, working together with VDDBL on the positive terminal of the second photodiode to ensure that it can generate a stable electrical signal when it receives the optical signal from the FM signal transmitting pin and transmits the signal to the detection signal receiving pin. Therefore, the second optocoupler U13 not only achieves the function of reverse isolation but also effectively improves the signal transmission efficiency and stability, providing constant power output control for the entire circuit system.

[0036] The advantages of this invention are: 1. This invention mainly uses an energy metering chip to collect the voltage and current values ​​output by the emergency power supply in real time, and calculates and converts them into output power values ​​for the MCU control chip. By comparing them with the standard power value preset by the MCU control chip, the required duty cycle is calculated to ensure that the power output to the LED lights remains unchanged.

[0037] 2. This invention mainly uses two in-phase amplifiers to convert the duty cycle signal calculated and output by the MCU into a 0-10V analog voltage to control the emergency output power of the lamp. It also improves the accuracy of adjustment and response speed, ensuring that the emergency power supply can maintain a constant output power under various load conditions, thereby achieving precise control of the output power of the LED emergency power supply.

[0038] The above-disclosed embodiments are merely a few specific examples of the present invention, but the present invention is not limited thereto. Any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A constant power output control device for a sinusoidal LED emergency power supply, characterized in that, include: The power metering chip control circuit is used to collect the current and voltage values ​​received by the LED lamps, calculate the output power value of the LED lamps, save it to the internal register, and then send it to the MCU control chip. The MCU control circuit reads the output power value, compares the output power value with a preset standard power value, and determines whether the output power value is equal to the standard power value. If so, the current output power value is maintained and continuously output; if not, the output power value is adjusted to be the same as the standard power value, and then the output power value is maintained at the standard power value. A dimming control circuit is used to adjust the output power value to control the power value of the LED lamp.

2. The constant power output control device for a sinusoidal LED emergency power supply according to claim 1, characterized in that, The MCU control circuit includes an MCU control chip, and the power metering chip control circuit includes a power metering chip. The power metering chip includes a circuit protection pin, a voltage acquisition pin, and a voltage protection pin. The circuit protection pin and the current acquisition pin are connected to the LED lamp to acquire the voltage and current information output by the LED lamp and calculate the output power value of the emergency power supply.

3. The constant power output control device for a sinusoidal LED emergency power supply according to claim 2, characterized in that, The power metering chip control circuit includes a detection signal transmission pin and a detection signal receiving pin. The detection signal transmission pin and the detection signal receiving pin are respectively connected to the frequency modulation signal receiving pin and the frequency modulation signal transmitting pin of the MCU control chip, and are used to send the output power value to the MCU control chip. After receiving the value, the MCU control chip compares it with the standard power value to generate the actual power value.

4. The constant power output control device for a sinusoidal LED emergency power supply according to claim 3, characterized in that, It also includes a drive circuit and a full-bridge inverter circuit. The drive circuit includes a first drive chip and a second drive chip. The first frequency modulation input pin, the second frequency modulation input pin of the first drive chip, and the third frequency modulation input pin and the fourth frequency modulation input pin of the second drive chip are respectively coupled to the first control signal pin, the second control signal pin, the third control signal pin, and the fourth control signal pin of the MCU control chip. The first frequency modulation output pin and the second frequency modulation output pin of the first drive chip, and the third frequency modulation output pin and the fourth frequency modulation output pin of the second drive chip are connected to the full-bridge inverter circuit. The first drive chip and the second drive chip are used to drive the full-bridge inverter circuit to output a 120V sine wave voltage to the LED lamp and the power metering chip.

5. The constant power output control device for a sinusoidal LED emergency power supply according to claim 4, characterized in that, The full-bridge inverter circuit includes a first MOSFET, a second MOSFET, a third MOSFET, and a fourth MOSFET. The sources of the first MOSFET and the second MOSFET, and the drain of the third MOSFET are jointly coupled to the first driving pin of the first driving chip. The fourth MOSFET is connected to the second driving pin of the second driving chip. The drains of the first MOSFET and the second MOSFET are jointly coupled to a 400V input voltage and their gates. The sources of the third MOSFET and the fourth MOSFET are jointly coupled to ground. The gates of the first MOSFET, the second MOSFET, the third MOSFET, and the fourth MOSFET are respectively coupled to the first frequency modulation output pin, the third frequency modulation output pin, the second frequency modulation output pin, and the fourth frequency modulation output pin. The first driving pin and the second driving pin pass through the first common-mode inductor and the second common-mode inductor in sequence, and output a 120V AC live wire and a 120V AC neutral wire.

6. The constant power output control device for a sinusoidal LED emergency power supply according to claim 5, characterized in that, The voltage protection pin is coupled to the 120V AC live wire, and the circuit protection pin and the voltage acquisition pin are coupled to the 120V AC neutral wire.

7. The constant power output control device for a sinusoidal LED emergency power supply according to claim 2, characterized in that, The dimming control circuit includes a first non-inverting amplifier and a second non-inverting amplifier. The non-inverting input of the first non-inverting amplifier is coupled to the pulse width modulation (PWM) pin of the MCU control chip, the inverting input is coupled to ground, and the output is coupled to the non-inverting input of the second amplifier. The inverting input and output of the second amplifier are coupled to a positive dimming pin, which is connected to an LED lamp. The MCU control chip calculates and controls the duty cycle of the PWM pin by comparing the output power value with a standard power value, so as to output a standard power value to the LED lamp through the positive dimming pin.

8. The constant power output control device for a sinusoidal LED emergency power supply according to claim 7, characterized in that, A first resistor, a second resistor, and a third resistor are connected sequentially between the non-inverting input terminal of the first non-inverting amplifier and the pulse width modulation pin. A first capacitor and a second capacitor are connected to the two ends of the second resistor, respectively. The first capacitor and the second capacitor are coupled to ground. A fourth resistor, a fifth resistor, and a third capacitor are also provided between the second non-inverting amplifier and the positive dimming pin. The fifth resistor and the third capacitor are both connected to ground.

9. A constant power output control device for a sinusoidal LED emergency power supply according to claim 2, characterized in that, It also includes an optocoupler isolation circuit, which includes a first optocoupler and a second optocoupler. The input terminal of the first optocoupler is coupled to VDDBL and the detection signal transmission pin of the power metering chip, and the output terminal is coupled to 3.3V voltage and the frequency modulation signal receiving pin of the MCU control chip. The input terminal of the second optocoupler is 3.3V voltage and the frequency modulation signal transmission pin of the MCU control chip, and the output terminal is coupled to VDDBL and the detection signal receiving pin of the power metering chip.

10. A constant power output control device for a sinusoidal LED emergency power supply according to claim 9, characterized in that, The first optocoupler includes a first light-emitting diode (LED) and a first photodiode. The anode of the first LED is connected to one end of a sixth resistor, the other end of the sixth resistor is connected to VDDBL, and the cathode is connected to the detection signal transmission pin. The anode of the first photodiode is connected to the frequency modulation signal receiving pin and a +3.3V voltage, and the cathode is coupled to ground. A seventh resistor is also connected between the anode of the first photodiode and the +3.3V voltage. The second optocoupler includes a second LED and a second photodiode. The anode of the second LED is connected to one end of an eighth resistor, the other end of the eighth resistor is connected to VDDBL, and the cathode is connected to the frequency modulation signal transmitting pin. The anode of the second photodiode is coupled to the detection signal receiving pin and one end of a ninth resistor, the other end of the ninth resistor is connected to VDDBL, and the cathode is connected to ground.

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