An automatic management and control system and method for a projector

Abstract

The application provides an automatic management and control system and method for a projector, which comprises a temperature control module, a voltage division module, a fault alarm module, an interface detection module, an abnormality warning module and a horizontal adjustment module, the temperature change of the power supply circuit of the projector is adjusted by the resistance value of a thermistor P1; the internal resistance value of the thermistor P1 is increased according to the temperature rise, the thermistor P1 is controlled to be cut off; the resistance R1 and the resistance R2 are connected in series to divide voltage, the power supply circuit of the projector is converted and inputted under the cut-off of the thermistor P1, and the safe start of the projector is ensured; the indicator lamp L3 immediately prompts once the projector is detected to be abnormal, so as to protect the projector and other equipment, the temperature change of the power supply circuit of the projector is adjusted by the resistance value of a thermistor N1; the internal resistance value of the thermistor N1 is reduced according to the temperature rise, the thermistor N1 is controlled to be turned on, and then the temperature abnormality of the power supply circuit is alarmed and prompted, and when the temperature of the thermistor P1 and the thermistor N1 exceeds a preset threshold value, the resistance value is automatically adjusted to reduce the current.

Description

Technical Field

[0001] This invention relates to an automatic control system and method for projectors, and particularly to the field of projector management technology. Background Technology

[0002] Despite the existence of various projector models on the market, the continuous development of projector technology has led to challenges and shortcomings in areas such as power management, temperature control, connection stability, and leveling.

[0003] Traditional projectors often lack effective power supply preparation and power output detection mechanisms. This can lead to projectors failing to start due to insufficient power supply or affecting projection quality due to abnormal power output during operation. In addition, there is a lack of effective means to manage the temperature of the power cord. When the line temperature rises, traditional projectors often cannot react in time, thus increasing safety hazards.

[0004] Then, in terms of connecting external devices, traditional projectors usually only focus on the physical connection of the interface, and lack a mechanism for detecting and identifying connection stability. As a result, during use, poor contact of the connector can affect the stability of data transmission, and may even lead to device damage.

[0005] Finally, regarding level adjustment, although some high-end projectors are equipped with a level, their adjustment methods are usually quite cumbersome, requiring users to manually adjust multiple parameters. In addition, projectors often cannot automatically turn off the power to the level during the adjustment process, thus increasing energy consumption. Summary of the Invention

[0006] Purpose of the invention: One purpose is to provide an automatic control system for projectors to solve the above-mentioned problems existing in the prior art; a further purpose is to provide an automatic control method for projectors.

[0007] Technical solution: An automatic control system for projectors, comprising:

[0008] The temperature control module adjusts the resistance of the projector's power supply line by using thermistor P1 to control the thermistor P1 to cut off as the temperature rises.

[0009] The voltage divider module uses resistors R1 and R2 in series to divide the voltage, and converts the input to the projector's power supply line when the thermistor P1 is cut off.

[0010] The fault alarm module adjusts the resistance of the projector's power supply line by using thermistor N1 to detect temperature changes; it reduces the internal resistance of thermistor N1 as the temperature rises, thus controlling the conduction of thermistor N1.

[0011] The interface detection module, triggered by the silicon controlled rectifier U1, indicates the connection status between interface J1 and the projector via indicator light L1.

[0012] The abnormality warning module uses indicator lights L2 and L3 to indicate the power-on status of the projector before and after operation.

[0013] The horizontal adjustment module adjusts the height of the lift based on the position of the slider on the first or third guide rail, thereby adjusting the level of the projector. The connection between the slider and the second guide rail controls the opening of the normally closed contact S.

[0014] In a further embodiment, the temperature control module includes a thermistor P1, a diode D2, a resistor R3, a transistor Q2, a silicon controlled rectifier (SCR) D1, and a capacitor C1. One end of the thermistor P1 is connected to the power supply terminal IN, and the other end of the thermistor P1 is connected to the negative terminal of the diode D2, the positive terminal of the SCR D1, one end of the resistor R3, and the collector terminal of the transistor Q2. The base terminal of the transistor Q2 is connected to the other end of the resistor R3, and the emitter terminal of the transistor Q2 is connected to pin 1 of the SCR D1. The positive terminal of the diode D2 is connected to ground E, the negative terminal of the SCR D1 is connected to one end of the capacitor C1, and one end of the capacitor C1 is connected to ground GND.

[0015] In a further embodiment, the voltage divider module includes resistor R1, resistor R2 and diode D3. One end of resistor R2 is connected to one end of thermistor P1, the other end of resistor R2 is connected to one end of resistor R1, the other end of resistor R1 is connected to the positive terminal of diode D3, and the negative terminal of diode D3 is connected to the negative terminal of diode D2.

[0016] In a further embodiment, the fault alarm module includes a thermistor N1, a resistor R2, a transistor Q1, and an alarm L. One end of the thermistor N1 is connected to one end of the resistor R2, and the other end of the thermistor N1 is connected to one end of the resistor R2 and the collector terminal of the transistor Q1. The other end of the resistor R2 is connected to the base terminal of the transistor Q1. The emitter terminal of the transistor Q1 is connected to one end of the alarm L1, and the other end of the alarm L1 is connected to ground GND.

[0017] In a further embodiment, the interface detection module includes an interface J1, a silicon controlled rectifier (SCR) U1, a capacitor C2, an indicator light L1, and a resistor R6. Pins 1 and 2 of the interface J1 are electrically connected to the projector. Pin 3 of the interface J1 is connected to the positive terminal of the SCR U1. The negative terminal of the SCR U1 is connected to pin 1 of the interface J1, one end of the capacitor C2, and the positive terminal of the indicator light L1. The negative terminal of the indicator light L1 is connected to one end of the resistor R6. The other end of the resistor R6 is connected to ground GND and the other end of the capacitor C2. Pin 1 of the SCR U1 is connected to the negative terminal of the SCR D1.

[0018] In a further embodiment, the abnormality warning module includes a front indicator unit and a rear indicator unit. The front indicator unit includes a resistor R4 and an indicator light L2. One end of the resistor R4 is connected to pin 1 of the SCR U1 and the projector, respectively. The other end of the resistor R4 is connected to the positive terminal of the indicator light L2, and the negative terminal of the indicator light L2 is connected to ground GND. The rear indicator unit includes a resistor R5 and an indicator light L3. One end of the resistor R5 is electrically connected to the projector. The other end of the resistor R5 is connected to the positive terminal of the indicator light L3, and the negative terminal of the indicator light L3 is connected to ground GND.

[0019] In a further embodiment, the leveling module includes a normally closed contact S, resistors R7, R8, and R9, capacitor C3, resistor R10, a level, and a converter. One end of the normally closed contact S is connected to the negative terminal of the thyristor D1. The other end of the normally closed contact S is connected to one end of resistor R8, one end of resistor R7, and one end of capacitor C3. The other end of resistor R7 is connected to the other end of capacitor C3, one end of resistor R9, and one end of resistor R10. The other end of resistor R10 is connected to pin 3 of the level. The other end of resistor R8 is connected to pin 2 of the level. The other end of resistor R9 is connected to pin 1 of the level. Pins 4 and 6 of the level are both connected to the converter. Pin 5 of the level is connected to pin 1 of the normally closed contact S. Pins 1, 2, 3, and 4 of the converter are all connected to a lift mechanism located diagonally opposite the projector. The level is installed inside the projector.

[0020] In a further embodiment, the level includes a housing, a first guide rod, a second guide rod, and a third guide rod installed within the housing, and a slider disposed between and slidingly engaging with the first, second, and third guide rails. A gap is provided between the first, second, and third guide rails, and the first, second, and third guide rails and the slider are all conductors.

[0021] An automatic control method for a projector includes the following steps:

[0022] Step 1: First, the thermistor P1 transmits the acquired power to the transistor Q2, triggering it to conduct. At this point, the transistor Q2 outputs power, energizing the silicon controlled rectifier D1, thus powering the projector. During the online projector power supply process, indicator light L2 indicates the projector's power supply status; if power is available, indicator light L2 illuminates.

[0023] Step 2: During the power supply process, as the current in the power supply continuously increases, the temperature of the power supply line rises. At this time, the thermistor P1 adjusts its resistance according to the temperature change of the projector's power supply line; the internal resistance of the thermistor P1 increases according to the temperature rise, controlling the thermistor P1 to cut off, so that the power supply is transmitted through resistors R2 and R1.

[0024] Step 3: Resistors R1 and R2 form a series voltage divider circuit. By reducing the voltage value, the temperature rise of the power supply line is controlled. Then, transistor Q2 and thyristor D1 are sequentially triggered to conduct. The temperature change of the power supply line causes the projector to operate under different power supply conditions. Diode D2 is reverse-grounded to protect the power supply terminal.

[0025] Step 4: With thermistor P1 cut off, thermistor N1 conducts, transistor Q1 is energized and conducts, causing speaker L to sound, indicating the temperature rise phenomenon in the power supply line.

[0026] Step 5: Interface J1 connects to the projector and transmits data. When interface J1 is connected to an external device, the SCR U1 is energized and conducts. When indicator light L1 is lit, the connection between interface J1 and the external device is good; when indicator light L1 is off, the connection between interface J1 and the external device is abnormal.

[0027] Step 6: Indicator L2 detects the power supply of the projector, and indicator L3 detects the output power of the projector.

[0028] Step 7: After the projector is powered on, the normally closed contact S supplies power to pins 1, 2 and 3 of the level.

[0029] When the slider is in the first guide rail position, pins 1 and 4 of the level indicator are connected, the converter is energized, and the lifting device installed diagonally on the projector is driven to adjust the tilted projector to a horizontal position.

[0030] When the slider is in the second guide rail position, pins 2 and 5 of the level are connected, and pin 1 of the normally closed contact S is energized, causing the normally closed contact S to open.

[0031] When the slider is in the third guide rail position, pins 3 and 6 of the level are connected, the converter is powered on, and the lift installed at the diagonal of the projector is driven to adjust the tilted projector to a horizontal position.

[0032] In a further embodiment, transistors Q1 and Q2 are both NPN; silicon controlled rectifiers D1 and U1 are both unidirectional silicon controlled rectifiers; thermistor P1 is a positive temperature coefficient thermistor; and N1 is a negative temperature coefficient thermistor.

[0033] Beneficial Effects: This invention proposes an automatic control system and method for projectors. The system uses a thermistor P1 to adjust the resistance of the projector's power supply line based on temperature changes. The internal resistance of thermistor P1 increases with temperature, controlling its cutoff. Resistors R1 and R2 are connected in series for voltage division, switching the power supply input to the projector while thermistor P1 is cut off, ensuring safe projector startup. Indicator L3 immediately alerts the system upon detecting a projector malfunction, protecting the projector and other equipment. Thermistor N1 adjusts the resistance of the projector's power supply line based on temperature changes; the internal resistance of thermistor N1 decreases with temperature increases, controlling its cutoff. The conduction of thermistor P1 triggers an alarm for abnormal temperature in the power supply line. When the temperature of thermistors P1 and N1 exceeds a preset threshold, the resistance is automatically adjusted to reduce current and heat generation in the line. The trigger conduction of the thyristor U1 indicates the connection status between interface J1 and the projector via indicator light L1. Indicator lights L2 and L3 indicate the power-on status of the projector before and after operation. The slider adjusts the height of the lifter by adjusting the position of the slider on the first or third guide rail, thus adjusting the level of the projector. The connection between the slider and the second guide rail controls the opening of the normally closed contact S. When the position of the projector changes, the conduction status of the slider and the guide rail is automatically adjusted to achieve fast and accurate horizontal position adjustment. Attached Figure Description

[0034] Figure 1 This is a system module distribution diagram of the present invention.

[0035] Figure 2 This is the circuit layout diagram of the present invention.

[0036] Figure 3 This is a structural diagram of the level instrument of the present invention.

[0037] The attached diagram is labeled as follows: 100, level; 101, first guide rail; 102, second guide rail; 103, third guide rail; 104, slider. Detailed Implementation

[0038] The applicant argues that traditional projectors often lack effective pre-power supply preparation and post-power output detection mechanisms, which leads to projectors failing to start due to insufficient power supply or affecting projection quality due to abnormal power output during operation. In addition, there is a lack of effective means to manage the temperature of the power cord. When the line temperature rises, traditional projectors often cannot react in time, thus increasing safety hazards.

[0039] To address the problems existing in the prior art, this invention provides an automatic control system and method for projectors, which enables control over the projector's power supply, temperature control, connection stability, power supply anomaly detection, and horizontal adjustment.

[0040] The present solution will be further described in detail below through embodiments and with reference to the accompanying drawings.

[0041] In this application, we propose an automatic control system and method for a projector, which includes an automatic control system for a projector comprising:

[0042] The temperature control module includes a thermistor P1, a diode D2, a resistor R3, a transistor Q2, a silicon controlled rectifier D1, and a capacitor C1.

[0043] One end of the thermistor P1 is connected to the power supply terminal IN. The other end of the thermistor P1 is connected to the negative terminal of diode D2, the positive terminal of silicon controlled rectifier D1, one end of resistor R3, and the collector terminal of transistor Q2. The base terminal of transistor Q2 is connected to the other end of resistor R3, and the emitter terminal of transistor Q2 is connected to pin 1 of silicon controlled rectifier D1. The positive terminal of diode D2 is connected to ground E, and the negative terminal of silicon controlled rectifier D1 is connected to one end of capacitor C1. One end of capacitor C1 is connected to ground GND. The thermistor P1 adjusts its resistance according to the temperature change of the projector's power supply line. The internal resistance of the thermistor P1 increases with the increase of temperature, thereby controlling the thermistor P1 to be cut off.

[0044] The voltage divider module includes resistor R1, resistor R2, and diode D3.

[0045] One end of resistor R2 is connected to one end of thermistor P1, and the other end of resistor R2 is connected to one end of resistor R1. The other end of resistor R1 is connected to the positive terminal of diode D3, and the negative terminal of diode D3 is connected to the negative terminal of diode D2. Resistors R1 and R2 are connected in series to divide the voltage, and the power supply line of the projector is converted when the thermistor P1 is cut off.

[0046] The fault alarm module includes a thermistor N1, a resistor R2, a transistor Q1, and an alarm L.

[0047] One end of the thermistor N1 is connected to one end of the resistor R2, and the other end of the thermistor N1 is connected to one end of the resistor R2 and the collector of the transistor Q1. The other end of the resistor R2 is connected to the base of the transistor Q1, and the emitter of the transistor Q1 is connected to one end of the alarm L1. The other end of the alarm L1 is connected to ground GND. The thermistor N1 adjusts its resistance according to the temperature change of the power supply line of the projector; the internal resistance of the thermistor N1 decreases as the temperature rises, thus controlling the conduction of the thermistor N1.

[0048] The interface detection module includes interface J1, silicon controlled rectifier U1, capacitor C2, indicator light L1, and resistor R6.

[0049] Pins 1 and 2 of interface J1 are both electrically connected to the projector. Pin 3 of interface J1 is connected to the positive terminal of SCR U1. The negative terminal of SCR U1 is connected to pin 1 of interface J1, one end of capacitor C2, and the positive terminal of indicator light L1. The negative terminal of indicator light L1 is connected to one end of resistor R6. The other end of resistor R6 is connected to ground GND and the other end of capacitor C2. Pin 1 of SCR U1 is connected to the negative terminal of SCR D1. When SCR U1 is triggered and turned on, the connection status between interface J1 and the projector is indicated by indicator light L1.

[0050] An abnormality warning module includes a front indicator unit and a rear indicator unit. The front indicator unit includes a resistor R4 and an indicator light L2. One end of the resistor R4 is connected to pin 1 of the thyristor U1 and the projector, respectively. The other end of the resistor R4 is connected to the positive terminal of the indicator light L2, and the negative terminal of the indicator light L2 is connected to ground GND.

[0051] The rear indicator unit includes a resistor R5 and an indicator light L3. One end of the resistor R5 is electrically connected to the projector, and the other end of the resistor R5 is connected to the positive terminal of the indicator light L3. The negative terminal of the indicator light L3 is connected to ground (GND). Indicator lights L2 and L3 indicate the front and rear power status of the projector.

[0052] The leveling module includes a normally closed contact S, resistors R7, R8, and R9, capacitor C3, resistor R10, a level 100, and a converter. One end of the normally closed contact S is connected to the negative terminal of the thyristor D1. The other end of the normally closed contact S is connected to one end of resistor R8, one end of resistor R7, and one end of capacitor C3. The other end of resistor R7 is connected to the other end of capacitor C3, one end of resistor R9, and one end of resistor R10. The other end of resistor R10 is connected to pin 3 of the level 100. The other end of resistor R8 is connected to pin 2 of the level 100. The other end of resistor R9 is connected to pin 1 of the level 100. Pins 4 and 6 of the level 100 are both connected to the converter. Pin 5 of the level 100 is connected to pin 1 of the normally closed contact S. Pins 1, 2, 3, and 4 of the converter are all connected to a lift mechanism located diagonally opposite the projector. The level 100 is installed inside the projector.

[0053] The level 100 includes a housing, a first guide rod, a second guide rod, and a third guide rod installed inside the housing, and a slider 104 disposed between the first guide rail 101, the second guide rail 102, and the third guide rail 103 and slidingly engaged with the first guide rail 101, the second guide rail 102, and the third guide rail 103. Gaps are left between the first guide rail 101, the second guide rail 102, and the third guide rail 103. The first guide rail 101, the second guide rail 102, the third guide rail 103, and the slider 104 are all conductors. The slider 104 adjusts the height of the lifter at the position of the first guide rail 101 or the third guide rail 103 to adjust the level of the projector. The connection between the slider 104 and the second guide rail 102 controls the opening of the normally closed contact S.

[0054] An automatic control method for a projector includes the following steps:

[0055] Step 1: First, the thermistor P1 transmits the acquired power to the transistor Q2, triggering it to conduct. At this point, the transistor Q2 outputs power, energizing the silicon controlled rectifier D1, thus powering the projector. During the online projector power supply process, indicator light L2 indicates the projector's power supply status; if power is available, indicator light L2 illuminates.

[0056] Step 2: During the power supply process, as the current in the power supply continuously increases, the temperature of the power supply line rises. At this time, the thermistor P1 adjusts its resistance according to the temperature change of the projector's power supply line; the internal resistance of the thermistor P1 increases according to the temperature rise, controlling the thermistor P1 to cut off, so that the power supply is transmitted through resistors R2 and R1.

[0057] Step 3: Resistors R1 and R2 form a series voltage divider circuit. By reducing the voltage value, the temperature rise of the power supply line is controlled. Then, transistor Q2 and thyristor D1 are sequentially triggered to conduct. The temperature change of the power supply line causes the projector to operate under different power supply conditions. Diode D2 is reverse-grounded to protect the power supply terminal.

[0058] Step 4: With thermistor P1 cut off, thermistor N1 conducts, transistor Q1 is energized and conducts, causing speaker L to sound, indicating the temperature rise phenomenon in the power supply line.

[0059] Step 5: Interface J1 connects to the projector and transmits data. When interface J1 is connected to an external device, the SCR U1 is energized and conducts. When indicator light L1 is lit, the connection between interface J1 and the external device is good; when indicator light L1 is off, the connection between interface J1 and the external device is abnormal.

[0060] Step 6: Indicator L2 detects the power supply of the projector, and indicator L3 detects the output power of the projector.

[0061] Step 7: After the projector is powered on, the normally closed contact S supplies power to pins 1, 2 and 3 of the level 100.

[0062] When slider 104 is in position on the first guide rail 101, pins 1 and 4 of level 100 are connected, the converter is powered on, and the lifter installed diagonally on the projector is driven to adjust the tilted projector to a horizontal position.

[0063] When the slider 104 is in the position of the second guide rail 102, pins 2 and 5 of the level 100 are connected, and pin 1 of the normally closed contact S is energized, causing the normally closed contact S to open.

[0064] When slider 104 is in the position of the third guide rail 103, pins 3 and 6 of level 100 are connected, the converter is powered on, and the lift installed at the diagonal of the projector is driven to adjust the tilted projector to a horizontal position.

[0065] As described above, although the invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An automatic control system for a projector, characterized in that, include: The temperature control module adjusts the resistance of the projector's power supply line by using thermistor P1 to control the thermistor P1 to cut off as the temperature rises. The voltage divider module uses resistors R1 and R2 in series to divide the voltage, and converts the input to the projector's power supply line when the thermistor P1 is cut off. The fault alarm module adjusts the resistance of the projector's power supply line by using thermistor N1 to detect temperature changes; it reduces the internal resistance of thermistor N1 as the temperature rises, thus controlling the conduction of thermistor N1. The interface detection module, triggered by the silicon controlled rectifier U1, indicates the connection status between interface J1 and the projector via indicator light L1. The abnormality warning module uses indicator lights L2 and L3 to indicate the power-on status of the projector before and after operation. The horizontal adjustment module adjusts the height of the lift based on the position of the slider on the first or third guide rail, thereby adjusting the level of the projector. The connection between the slider and the second guide rail controls the opening of the normally closed contact S.

2. The automatic control system for a projector according to claim 1, characterized in that, The temperature control module includes a thermistor P1, a diode D2, a resistor R3, a transistor Q2, a silicon controlled rectifier (SCR) D1, and a capacitor C1. One end of the thermistor P1 is connected to the power supply terminal IN, and the other end of the thermistor P1 is connected to the negative terminal of the diode D2, the positive terminal of the SCR D1, one end of the resistor R3, and the collector terminal of the transistor Q2. The base terminal of the transistor Q2 is connected to the other end of the resistor R3, and the emitter terminal of the transistor Q2 is connected to pin 1 of the SCR D1. The positive terminal of the diode D2 is connected to ground E, the negative terminal of the SCR D1 is connected to one end of the capacitor C1, and one end of the capacitor C1 is connected to ground GND.

3. The automatic control system for a projector according to claim 1, characterized in that, The voltage divider module includes resistors R1 and R2 and diode D3. One end of resistor R2 is connected to one end of thermistor P1, the other end of resistor R2 is connected to one end of resistor R1, the other end of resistor R1 is connected to the positive terminal of diode D3, and the negative terminal of diode D3 is connected to the negative terminal of diode D2.

4. The automatic control system for a projector according to claim 1, characterized in that, The fault alarm module includes a thermistor N1, a resistor R2, a transistor Q1, and an alarm L. One end of the thermistor N1 is connected to one end of the resistor R2, and the other end of the thermistor N1 is connected to one end of the resistor R2 and the collector terminal of the transistor Q1. The other end of the resistor R2 is connected to the base terminal of the transistor Q1. The emitter terminal of the transistor Q1 is connected to one end of the alarm L1, and the other end of the alarm L1 is connected to ground GND.

5. An automatic control system for a projector according to claim 1, characterized in that, The interface detection module includes an interface J1, a silicon controlled rectifier (SCR) U1, a capacitor C2, an indicator light L1, and a resistor R6. Pins 1 and 2 of the interface J1 are electrically connected to the projector. Pin 3 of the interface J1 is connected to the positive terminal of the SCR U1. The negative terminal of the SCR U1 is connected to pin 1 of the interface J1, one end of the capacitor C2, and the positive terminal of the indicator light L1. The negative terminal of the indicator light L1 is connected to one end of the resistor R6. The other end of the resistor R6 is connected to ground GND and the other end of the capacitor C2. Pin 1 of the SCR U1 is connected to the negative terminal of the SCR D1.

6. An automatic control system for a projector according to claim 1, characterized in that, The abnormal warning module includes a front indicator unit and a rear indicator unit. The front indicator unit includes a resistor R4 and an indicator light L2. One end of the resistor R4 is connected to pin 1 of the SCR U1 and the projector, and the other end of the resistor R4 is connected to the positive terminal of the indicator light L2. The negative terminal of the indicator light L2 is connected to ground GND. The rear indicator unit includes a resistor R5 and an indicator light L3. One end of the resistor R5 is electrically connected to the projector, and the other end of the resistor R5 is connected to the positive terminal of the indicator light L3. The negative terminal of the indicator light L3 is connected to ground GND.

7. An automatic control system for a projector according to claim 1, characterized in that, The leveling module includes a normally closed contact S, resistors R7, R8, and R9, capacitor C3, resistor R10, a level, and a converter. One end of the normally closed contact S is connected to the negative terminal of the thyristor D1. The other end of the normally closed contact S is connected to one end of resistor R8, one end of resistor R7, and one end of capacitor C3. The other end of resistor R7 is connected to the other end of capacitor C3, one end of resistor R9, and one end of resistor R10. The other end of resistor R10 is connected to pin 3 of the level. The other end of resistor R8 is connected to pin 2 of the level. The other end of resistor R9 is connected to pin 1 of the level. Pins 4 and 6 of the level are both connected to the converter. Pin 5 of the level is connected to pin 1 of the normally closed contact S. Pins 1, 2, 3, and 4 of the converter are all connected to a lift mechanism located diagonally opposite the projector. The level is installed inside the projector.

8. An automatic control system for a projector according to claim 7, characterized in that, The level includes a housing, a first guide rod, a second guide rod, and a third guide rod installed inside the housing, and a slider disposed between and slidingly engaging with the first guide rail, the second guide rail, and the third guide rail. A gap is left between the first guide rail, the second guide rail, and the third guide rail. The first guide rail, the second guide rail, the third guide rail, and the slider are all conductors.

9. An automatic control method for a projector, used to implement the system described in any one of claims 1 to 8, characterized in that, Includes the following steps: Step 1: First, the thermistor P1 transmits the acquired power to the transistor Q2, triggering it to conduct. At this point, the transistor Q2 outputs power, energizing the silicon controlled rectifier D1, thus powering the projector. During the online projector power supply process, indicator light L2 indicates the projector's power supply status; if power is available, indicator light L2 illuminates. Step 2: During the power supply process, as the current in the power supply continuously increases, the temperature of the power supply line rises. At this time, the thermistor P1 adjusts its resistance according to the temperature change of the projector's power supply line; the internal resistance of the thermistor P1 increases according to the temperature rise, controlling the thermistor P1 to cut off, so that the power supply is transmitted through resistors R2 and R1. Step 3: Resistors R1 and R2 form a series voltage divider circuit. By reducing the voltage value, the temperature rise of the power supply line is controlled. Then, transistor Q2 and thyristor D1 are sequentially triggered to conduct. The temperature change of the power supply line causes the projector to operate under different power supply conditions. Diode D2 is reverse-grounded to protect the power supply terminal. Step 4: With thermistor P1 cut off, thermistor N1 conducts, transistor Q1 is energized and conducts, causing speaker L to sound, indicating the temperature rise phenomenon in the power supply line. Step 5: Interface J1 connects to the projector and transmits data. When interface J1 is connected to an external device, the SCR U1 is energized and conducts. When indicator light L1 is lit, the connection between interface J1 and the external device is good; when indicator light L1 is off, the connection between interface J1 and the external device is abnormal. Step 6: Indicator L2 detects the power supply of the projector, and indicator L3 detects the output power of the projector. Step 7: After the projector is powered on, the normally closed contact S supplies power to pins 1, 2 and 3 of the level. When the slider is in the first guide rail position, pins 1 and 4 of the level indicator are connected, the converter is energized, and the lifting device installed diagonally on the projector is driven to adjust the tilted projector to a horizontal position. When the slider is in the second guide rail position, pins 2 and 5 of the level are connected, and pin 1 of the normally closed contact S is energized, causing the normally closed contact S to open. When the slider is in the third guide rail position, pins 3 and 6 of the level are connected, the converter is powered on, and the lift installed at the diagonal of the projector is driven to adjust the tilted projector to a horizontal position.

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