A lamp over-temperature protection control system

Abstract

The utility model relates to lighting technical field, concretely relates to a lamp overtemperature protection control system, including constant current drive power supply, overtemperature protection module and LED lamps and lanterns, constant current drive power supply is used for the power supply of LED lamps and lanterns, constant current drive power supply still includes voltage current monitoring control circuit, voltage current monitoring control circuit includes voltage detection module, current detection module and control module, voltage detection module is used for detecting LED lamps and lanterns voltage, current detection module is used for detecting the output current of constant current drive power supply, control module's control output signal PWM and constant current drive circuit's PWM end electricity are connected, overtemperature protection module module is installed in the heat dissipation system of LED lamps and lanterns, including positive temperature coefficient thermistor and temperature protection switch, and parallel after series connection in the positive line or negative line of LED lamps and lanterns, the utility model can carry out overtemperature protection to the lamps and lanterns, avoid causing lamps and lanterns component, spare and part damage and accelerate LED lamp pearl ageing, failure and so on problem.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, specifically to a lamp over-temperature protection control system. Background Technology

[0002] In specialized applications such as fishing boats using lights and high-altitude work equipment, high-performance lighting is required. Higher lighting demands result in larger currents and thus higher heat generation. Lighting fixtures typically require cooling systems, such as air or water cooling. When the cooling system malfunctions, the temperature of the light source can rise continuously. This is especially true for high-power fixtures (several hundred watts and above), which can quickly exceed the tolerance temperatures of their components. Without proper protection, this can damage components and accelerate the aging and failure of LED chips. Utility Model Content

[0003] The purpose of this utility model is to provide a lighting over-temperature protection control system that can protect lighting fixtures from over-temperature, thereby avoiding damage to lighting fixture components and parts, as well as accelerating the aging and failure of LED beads.

[0004] To achieve the above objectives, a lighting fixture over-temperature protection control system is provided, comprising a constant current drive power supply and an LED lighting fixture. The constant current drive power supply is used to power the LED lighting fixture and also includes an over-temperature protection module. The constant current drive power supply includes a voltage and current monitoring and control circuit, which includes a voltage detection module, a current detection module, and a control module. The voltage detection module is used to detect the load voltage across the positive and negative terminals of the LED lighting fixture. The current detection module is used to detect the output current of the constant current drive power supply. The voltage detection module and the current detection module are electrically connected to the control module, and the control output signal PWM of the control module is electrically connected to the PWM terminal of the constant current drive circuit. The over-temperature protection module is installed in the heat dissipation system of the LED lighting fixture and includes a positive temperature coefficient thermistor and a temperature protection switch, which are connected in parallel and then in series in the positive or negative terminal line of the LED lighting fixture.

[0005] When the LED lighting fixture's heat dissipation system malfunctions, the voltage and current detection modules of the voltage and current monitoring and control circuit detect abnormal voltage or current and feed this information back to the control module. The control module then sends a PWM control signal with a 0% duty cycle (continuous low level) to the constant current drive circuit, shutting off the output current and protecting the LED lighting fixture. After the LED lighting fixture's heat dissipation system returns to normal, the over-temperature protection module resumes normal operation. The constant current drive power supply needs to be powered on again before the control module sends a normal PWM signal, restoring the standard output of the constant current drive circuit.

[0006] Furthermore, the over-temperature protection module is installed in the heat dissipation system of the LED lamp.

[0007] Furthermore, it also includes several cable temperature detection modules, each comprising a microcontroller and a temperature sensor, the temperature sensor being mounted on the cable between the constant current drive power supply and the LED lamp.

[0008] Furthermore, it also includes a first communication module, and the cable temperature detection module is equipped with a second communication module, with the first communication module and the second communication module being communicatively connected.

[0009] Furthermore, it also includes a display screen and an audible and visual alarm, both of which are electrically connected to the controller.

[0010] Principles and advantages:

[0011] 1. This solution can achieve over-temperature protection while embedding the protection circuit into each product, eliminating the need for additional wiring, changing the existing wiring and installation methods, and is installed in the same way as ordinary lighting fixtures, making construction and installation convenient;

[0012] 2. Since the protection circuit is built into each product, it can protect only one or a few faulty lamps without affecting the normal operation of other normal heat dissipation lamps;

[0013] 3. Because the protection circuit at the back end (LED lamp end) is used to detect and activate the protection at the front end (constant current drive power supply end), the equipment can be effectively protected from damage even if the front and back ends are installed in different locations, which are several meters to tens of meters apart.

[0014] 4. Because the constant current source output is disconnected from the source in time when there is an abnormality, it not only protects the lamp beads and constant current source from damage, but also ensures that the protection circuits RT1 and KT1 themselves will not fail due to long-term abnormal operation. Therefore, this over-temperature protection scheme has high reliability.

[0015] 5. This solution uses several cable temperature detection modules to monitor the temperature of cables ranging from several meters to tens of meters, thus preventing abnormal cable temperatures. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the circuit principle of a lamp over-temperature protection control system according to an embodiment of the present invention. Detailed Implementation

[0017] The following detailed description illustrates the specific implementation method:

[0018] Example

[0019] A lighting fixture over-temperature protection control system, basically as follows: Figure 1As shown, the system includes a constant current drive power supply, an LED lamp, and an over-temperature protection module. The constant current drive power supply powers the LED lamp and includes a voltage and current monitoring and control circuit and a constant current drive circuit. The voltage and current monitoring and control circuit includes a voltage detection module, a current detection module, and a control module. The voltage detection module detects the load voltage (V+, V-) across the positive and negative terminals of the LED lamp; the current detection module detects the output current of the constant current drive power supply; the voltage detection module and the current detection module are electrically connected to the control module. In other embodiments, only one of the voltage detection module or the current detection module may be used. The control module uses a conventional microcontroller, such as a STEM32 series microcontroller, a 51 series microcontroller, or an ESP32 series microcontroller.

[0020] The constant current drive power supply is an AC / DC constant current drive power supply, specifically including a constant current drive circuit, a Zener diode, a field-effect transistor Q1, and an RS resistor. The constant current drive circuit acts as a constant current source, and the Zener diode provides a stable voltage reference for the gate of the MOSFET, keeping the voltage difference across the RS resistor constant, thereby achieving stable output current. The MOSFET dynamically adjusts its equivalent resistance according to the control signal to maintain a constant load current. The RS resistor is connected in series in the load circuit as a sampling resistor, converting the current signal into a voltage signal and feeding it back to the current detection module or the controller. The current detection module can obtain the current signal based on the resistance value of the RS resistor and the voltage signal. Using a separate current detection module facilitates maintenance and repair, given the high-current operating environment.

[0021] The control output signal PWM of the control module is electrically connected to the PWM terminal of the constant current drive circuit; the over-temperature protection module includes a positive temperature coefficient thermistor RT1 and a temperature protection switch KT1 connected in parallel, which are then connected in series in the positive or negative circuit of the LED lamp.

[0022] The positive temperature coefficient thermistor and temperature protection switch are installed on the heat dissipation system of the LED lamp.

[0023] The light source and constant current driver of the LED lights are installed separately. The constant current driver is installed inside the cabin of the light-equipped vessel, while the lights are suspended from the ship's side. This significantly reduces the weight on both sides of the ship, thereby lowering the center of gravity and ensuring safer navigation. Therefore, the constant current driver and the LED lights need to be placed several meters to tens of meters apart (not in the same location), connected by a cable. The voltage on the cable exceeds 100Vdc (the higher the power of the light, the higher the voltage). Several cable temperature detection modules are also installed on the cable between the constant current driver and the LED lights. Each cable temperature detection module includes a microcontroller, a temperature sensor, and a second communication module. The over-temperature protection control system for the lights includes a first communication module, which communicates with the second communication module. The constant current driver and the LED lights are located at the front and rear ends of the ship, several meters to tens of meters apart. Due to the large current and long cable length, the cable temperature is also high. If there are any entanglements, eddy current effects may occur, causing abnormal local temperature increases in the cable and potentially leading to melting. Therefore, the temperature of the cable can be detected by setting up several cable temperature detection modules. The temperature detection sensor is installed in the power supply circuit between the constant current drive power supply and the LED lamp.

[0024] The cable temperature detection module also includes a display screen and an audible and visual alarm, both electrically connected to a microcontroller. The microcontroller uses an ESP32 series microcontroller, is compact, and includes communication modules such as Bluetooth and WiFi. When an abnormal cable temperature is detected, it can issue an audible and visual alarm to alert personnel to take timely action.

[0025] Under normal operating conditions, the LED lamp dissipates heat normally. The positive temperature coefficient thermistor RT1 and temperature protection switch KT1 in the over-temperature protection module sense temperatures lower than their operating temperatures. RT1 is in a normal low-resistance state, and KT1 is closed in a short-circuit conducting state, rendering RT1 ineffective. At this time, the voltage detection module detects the load voltage (i.e., the voltage between V+ and V-) across the positive and negative terminals of the LED lamp, and the current detection module detects the output current of the constant current drive power supply. Both are within the normal range. The controller output terminal outputs a normal PWM signal, and the constant current drive power supply outputs a constant current to maintain the normal operation of the LED lamp.

[0026] When an LED light fixture malfunctions due to a fault in its cooling system (air cooling or water cooling, etc.), the temperature of the heat sink rises. At this time, the temperature sensed by RT1 and KT1 in the over-temperature protection module also rises. When the temperature reaches the operating temperature of KT1 in the over-temperature protection module, KT1 disconnects, and RT1 is connected in series in the V+ or V- line. RT1 at this time can reduce the arcing intensity and limit the arcing voltage and current generated when KT1 disconnects. Simultaneously, as the temperature continues to rise, the resistance of RT1 increases exponentially, causing the load voltage across the positive and negative terminals of the LED light fixture detected by the voltage detection module to rise abnormally, and the current... The detection module detects abnormal drops in the output current of the constant current drive power supply. When the control module detects an abnormal increase in voltage and / or an abnormal decrease in current, it immediately outputs a control signal with a 0% duty cycle (continuously low level) from the control output terminal, keeping the constant current drive circuit in a continuously off, no-output state. This extinguishes the LED lights, protecting them. Simultaneously, RT1 is also protected due to continuous heat generation from the lack of current. This state persists until the constant current drive power supply is manually disconnected, the cooling system fault is resolved, and the constant current drive power supply is powered on again. After the cooling system fault is resolved and the temperature returns to normal, RT1 automatically returns to its normal low-resistance state, and KT1 automatically returns to its short-circuit connected state, restoring the entire system to normal operation.

[0027] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are capable of accessing all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A lighting fixture over-temperature protection control system, comprising a constant current driving power supply and an LED lighting fixture, wherein the constant current driving power supply is used to power the LED lighting fixture, characterized in that: It also includes an over-temperature protection module. The constant current drive power supply includes a voltage and current monitoring and control circuit, which includes a voltage detection module, a current detection module, and a control module. The voltage detection module is used to detect the load voltage across the positive and negative terminals of the LED lamp. The current detection module is used to detect the output current of the constant current drive power supply. The voltage detection module and the current detection module are electrically connected to the control module. The control output signal PWM of the control module is electrically connected to the PWM terminal of the constant current drive circuit. The over-temperature protection module is installed in the heat dissipation system of the LED lamp and includes a positive temperature coefficient thermistor and a temperature protection switch, which are connected in parallel and then in series in the positive or negative line of the LED lamp.

2. The lighting fixture over-temperature protection control system according to claim 1, characterized in that: The over-temperature protection module is installed in the heat dissipation system of the LED lamp.

3. The lighting fixture over-temperature protection control system according to claim 1, characterized in that: It also includes several cable temperature detection modules, each comprising a microcontroller and a temperature sensor, wherein the temperature sensor is located on the power supply circuit between the constant current drive power supply and the LED lamp.

4. A lighting fixture over-temperature protection control system according to claim 3, characterized in that: It also includes a first communication module, and the cable temperature detection module is equipped with a second communication module, and the first communication module and the second communication module are communicatively connected.

5. A lighting fixture over-temperature protection control system according to claim 4, characterized in that: It also includes a display screen and an audible and visual alarm, both of which are electrically connected to the controller.

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