Heat preservation lamp controller capable of automatically identifying open circuit of load

Abstract

The utility model belongs to the field of heat preservation lamp controllers, and particularly relates to a heat preservation lamp controller capable of automatically identifying a load open circuit. Comprising a CPU control circuit, and an electric quantity detection circuit, a temperature detection circuit, a key circuit, a display circuit and a controllable output circuit which are respectively connected with the CPU control circuit, and also comprises a power supply circuit connected with all the circuits. According to the utility model, by detecting whether the load is open-circuited, the controller can immediately take actions, such as disconnecting a power supply, when finding abnormal conditions, so that potential safety hazards, such as fire disasters, caused by line faults are avoided. In addition, through an early warning system or an automatic diagnosis function, a user can know problems of the system earlier, necessary maintenance or replacement can be carried out in advance, and extra cost caused by sudden faults is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of heat preservation lamp controller, specifically is a kind of heat preservation lamp controller of automatic identification load open circuit. BACKGROUND

[0002] With the development of science and technology, intelligent temperature control equipment is more and more widely used in industry and daily life. As a common heating device, heat preservation lamp is widely used in agriculture, breeding and other fields. However, the traditional heat preservation lamp controller often cannot detect and handle in time when the load is open (i.e. the heating element is disconnected), leading to equipment failure and even safety accidents. Therefore, it is of great practical significance to develop a heat preservation lamp controller that can automatically identify load open circuit and take corresponding measures.

[0003] The traditional heat preservation lamp controller mainly relies on temperature sensor to monitor ambient temperature, and adjusts heating power through algorithm or other control strategy. However, these controllers have the following problems when the load is open:

[0004] Cannot detect load open circuit in time: when the heating element is disconnected, the controller cannot find out immediately, which may lead to temperature out of control.

[0005] Lack of protection mechanism: there is no effective protection mechanism to prevent equipment damage or safety hazards caused by load open circuit. INVENTION CONTENT

[0006] The utility model aims at providing a kind of heat preservation lamp controller of automatic identification load open circuit to overcome the above-mentioned defects.

[0007] The technical scheme adopted by the utility model to achieve the above-mentioned purpose is:

[0008] A kind of heat preservation lamp controller of automatic identification load open circuit, comprising: CPU control circuit and the electric quantity detection circuit, temperature detection circuit, key circuit, display circuit and controllable output circuit connected therewith respectively, further comprising power supply circuit connected with all circuits.

[0009] The CPU control circuit is composed of single-chip microcomputer U8 and its peripheral circuit.

[0010] The power supply circuit is specifically:

[0011] The input voltage AC is connected between the 1 and 3 pins of the circuit breaker BD1 through the protection circuit, the 2 pin of the circuit breaker BD1 is connected with the A end of the first primary coil of the transformer, the 4 pin of the circuit breaker BD1 is connected with the A end of the first primary coil through the capacitor C4, the current detection pin CS of the isolated primary feedback chip U1 is grounded through the resistor R1, the B end of the first primary coil of the transformer is connected with the A end of the first primary coil in sequence through the diodes D2 and D1, the node between the B end and the diode D2 is connected with the intelligent power pin SW of U1, the feedback pin FB of U1 is connected with the two ends of the second primary coil of the transformer through the resistors R2 and R3 respectively, the A end of the second primary coil is connected with the voltage input pin VDD of U1 in sequence through the resistor R70 and the diode D3, the B end of the second primary coil is connected with the voltage input pin VDD of U1 through the capacitor C2, the A end of the secondary coil of the transformer outputs 5V voltage through the diode D4, the B end of the secondary coil of the transformer is grounded, and the output end of the diode D1 is grounded through the capacitor C3 and the resistor R71 respectively.

[0012] The protection circuit is specifically:

[0013] The firewire AC_L of the input voltage AC is connected with the 1 pin of the circuit breaker BD1 in sequence through the resistor FR1 and the thermistor R100, the zero line AC_N of the input voltage AC is connected with the 3 pin of the circuit breaker BD1, and the 1 and 3 pins of the circuit breaker BD1 are connected in parallel with the resistor RV1 and the inductor X3.

[0014] The electric quantity detection circuit is two-way, which is the first detection circuit and the second detection circuit, wherein the first detection circuit is specifically:

[0015] The firewire voltage input end is connected with the current input pin IP1 of the electric energy metering chip U2 through the resistor R82, the first detection voltage input end is connected with the current input pin IN1 of U2 through the resistor R83, the resistor R82 is connected with the resistor R83 in sequence through the capacitors C21 and C23, the resistor R82 is also connected with the resistor R83 through the resistor R40, the zero line voltage input end is connected with the voltage input pin VP of U2 in sequence through the resistors R89, R88, R87, R86 and R85, the voltage input pin VP is also grounded through the resistor R84 and the capacitor C20 respectively, the multiplexing pin SDO and the voltage zero-crossing indication pin ZX of U2 are connected with the light emitting diodes of the optocouplers U10 and U13 respectively, the light-sensitive triodes of U10 and U13 are connected with the single-chip microcomputer U8 in the CPU control circuit, the multiplexing pin SDI and the clock pin SCLK of U2 are connected with the light-sensitive triodes of the optocouplers U11 and U12 respectively, and the light emitting diodes of U11 and U12 are connected with the single-chip microcomputer U8 in the CPU control circuit.

[0016] The electric quantity detection circuit is two-way, and is a first detection circuit and a second detection circuit, wherein the second detection circuit is specifically connected with the electric energy metering chip U15.

[0017] The second detection voltage input end is connected with the current input pin IP1 of the electric energy metering chip U15 through the resistor R39, the live wire voltage input end is connected with the current input pin IN1 of U15 through the resistor R8, the resistor R39 is connected with the resistor R8 through the capacitors C26 and C27 in sequence, the resistor R39 is also connected with the resistor R8 through the resistor R38, the multiplex pin SDO of U15 is connected with the light emitting diode of the optocoupler U14, the phototriode of U14 is connected with the single-chip microcomputer U8 in the CPU control circuit, the multiplex pin SDI and the clock pin SCLK of U2 are connected with the phototriodes of the optocouplers U16 and U17 respectively, and the light emitting diodes of U16 and U17 are connected with the single-chip microcomputer U8 in the CPU control circuit.

[0018] The temperature detection circuit is specifically connected with the electric energy metering chip U15.

[0019] One end of the terminal J2 is connected with a 5V input voltage, and the other end is connected with the ground through the capacitor C4 and the inductor L5 and the resistor R19 connected in series respectively, and the node between the inductor L5 and the resistor R19 is connected with the single-chip microcomputer U8 in the CPU control circuit through the resistor R18.

[0020] The key circuit is six-way sub-circuits with the same structure, and the specific structure is that:

[0021] The 5V input voltage is connected with the ground through the resistor and the button SW in sequence, and the node between the resistor and the button SW is connected with the single-chip microcomputer U8 in the CPU control circuit.

[0022] The controllable output circuit is specifically connected with the electric energy metering chip U15.

[0023] The input pin A of the optocoupler U6 is connected with the single-chip microcomputer U8 in the CPU control circuit through the resistor R20, and the two output pins M G1 and M M1 are connected with the first output circuit and the second output circuit with the same structure respectively.

[0024] The first output circuit is specifically connected with the electric energy metering chip U15.

[0025] The output pin M M1 of the optocoupler U6 is connected with the output end through the resistor R28 and the triode Q5 in sequence, the two ends of the resistor R28 are also connected with the resistor R31 in parallel, the input end and the output end of the diode Q5 are also connected with the resistor R27 and the capacitor X1 in sequence, and the output pin M G1 of the optocoupler U6 is connected with the output end of Q5 through the resistors R29 and R30 respectively.

[0026] The utility model has the following beneficial effects and advantages:

[0027] 1. Safety improvement: By detecting whether the load is open-circuit, the controller can take immediate action when an abnormal situation is found, such as disconnecting the power supply, thereby avoiding potential safety hazards such as fire caused by line failure.

[0028] 2. Prolong the life of the device: timely detection and handling of load open-circuit problems can help prevent overheating or other potential damage, which can effectively prolong the service life of the heat preservation lamp and its control system.

[0029] 3. Reduce maintenance costs: Through the early warning system or automatic diagnosis function, users can learn about the problems in the system earlier and perform necessary maintenance or replacement in advance, reducing additional costs caused by sudden failures. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 Circuit diagram of power supply circuit;

[0031] Figure 2 Circuit diagram of power detection circuit;

[0032] Figure 3 Circuit diagram of key circuit;

[0033] Figure 4 Circuit diagram of CPU control circuit;

[0034] Figure 5 Circuit diagram of display circuit;

[0035] Figure 6 Circuit diagram of controllable output circuit;

[0036] Figure 7 Circuit diagram of temperature detection circuit;

[0037] Figure 8 System block diagram of controller. DETAILED DESCRIPTION

[0038] The utility model will be further described in detail below in combination with the drawings and examples.

[0039] As Figures 1-8 shown, an automatic load open-circuit identification heat preservation lamp controller, comprising: CPU control circuit and the power detection circuit, temperature detection circuit, key circuit, display circuit and controllable output circuit connected therewith respectively, and further comprising a power supply circuit connected with all circuits.

[0040] Among them: temperature detection circuit: for monitoring ambient temperature.

[0041] Power detection circuit: for real-time monitoring of the actual power of the heat preservation lamp.

[0042] CPU control circuit: Contains a microcontroller (MCU) that executes the PID control algorithm and load open circuit detection logic.

[0043] Controllable output circuit: heat lamp, used to provide heat.

[0044] Key circuit, display circuit: digital tube and key display.

[0045] Power supply circuit: AC 220V converted to DC 5V;

[0046] Communication module (optional): used for remote monitoring and management.

[0047] Figure 4 The CPU control circuit is the main control part and is connected to other parts. Figure 2 The 8, 11, 12, and 13 pins of the power detection chip U2 are connected to the Figure 4 The 21, 22, 23, and 28 pins of the microcontroller U8 are connected to the 11, 12, and 13 pins of the power detection chip U15. Figure 4 Pins 24, 25, and 27 of the microcontroller U8 are connected to detect the power parameters; Figure 4 Pins 7, 8, 9, 15, 16, and 20 of the microcontroller U8 are connected to Figure 3 Connected to realize button control; Figure 4 Pins 1, 2, 14, 37, 40, 41, 42, 43, 44, 45, 46, 47, and 48 of U8 are Figure 5 Connect the digital tubes in the display to realize the display; Figure 4 26 pins of microcontroller U8 and Figure 6 Connect the 1st pin of U6 to realize the control of thyristor; Figure 4 Pin 38 of the microcontroller U8 is connected to Figure 7 connected to realize the function of temperature collection. Figure 2 The power conversion part converts the input AC 220V into DC 5V and 3.3V to power various parts of the system.

[0048] The microcontroller U8 is a R7F0C001G-QFP48 chip.

[0049] The utility model uses the method of detecting the real-time power of the load to determine whether the heat preservation lamp load is open circuit. The heating method of the heat preservation lamp is as follows:

[0050] If the measured temperature is less than the set temperature, continue to output at full power until the target temperature is reached.

[0051] Measured temperature = set temperature, maintain full power output

[0052] Measured temperature > set temperature, execute the following program logic

[0053] If the absolute value of the measured temperature and the set temperature is greater than or equal to 1℃ and less than 2℃ (2℃ > |Measured Temperature - Set Temperature| ≥ 1℃)

[0054] Instantly output a power gradient of ±5% (adjustable in the background), with a running time of 1 minute (adjustable in the background), and so on until the measured temperature = the set temperature, and continue working at the temperature-balancing power.

[0055] (2) If the absolute value of the measured temperature and the set temperature is greater than or equal to 2℃ and less than 3℃ (3℃ > |Measured Temperature - Set Temperature| ≥ 2℃)

[0056] Instantly output a power gradient of ±10% (adjustable in the background), with a running time of 1 minute (adjustable in the background), until 2℃ > |Measured Temperature - Set Temperature| ≥ 1℃ executes (1) program logic.

[0057] (3) If the absolute value of the measured temperature and the set temperature is greater than or equal to 3℃ (|Measured Temperature - Set Temperature| ≥ 3℃)

[0058] Instantly output a power gradient of ±20% (adjustable in the background), with a running time of 1 minute (adjustable in the background), until 3℃ > |Measured Temperature - Set Temperature| ≥ 2℃ executes (2) program logic.

[0059] Example:

[0060] Taking the factory-set temperature of 35℃ of the temperature controller as an example, after the user powers on the temperature controller, it will heat to 35℃ at full power and continue to work at full power;

[0061] At this time, when the measured temperature is 36℃, output 95% power for 30S; when the measured temperature is 37℃, continue to reduce 10% to 85% power on the basis of 95% and output for 30S; when the measured temperature is 38℃, continue to reduce 20% to 65% power on the basis of 85% and output for 30S; when the measured temperature is 36℃, continue to reduce 5% to 60% power on the basis of 65% and output for 30S; at this time, when the measured temperature is 35℃, output 60% power continuously and stably.

[0062] Algorithm for judging open circuit of load:

[0063] Normal working state: When the incubator lamp is in normal working state, its power output should be maintained at a stable level, which is usually not less than 30% of the total power according to actual situation.

[0064] Monitoring period: The system will continuously monitor the power output of the incubator lamp to ensure that it is within the normal working range. The monitoring is carried out in real time, but the specific monitoring frequency can be different according to the system design.

[0065] Abnormality detection: When the system detects that the power output of the heat preservation lamp suddenly drops to 0, and this state lasts for 1 minute, i.e. 60 seconds, it will trigger the abnormality detection mechanism of the system.

[0066] Load open circuit determination: If the above abnormality occurs, the system regards it as a sign of load open circuit. This is because only when there is a break in the circuit (such as a broken wire, loose connection, etc.), the current will be completely interrupted, resulting in a power output of 0.

[0067] Response measures: Once it is determined that the load is open, the system should take appropriate measures, such as issuing an alarm prompt and reporting to the network.

Claims

1. An automatic identification of open-circuit load thermostat controller characterized by, include: The CPU control circuit and the power detection circuit, temperature detection circuit, key circuit, display circuit and controllable output circuit connected thereto respectively, and also includes a power supply circuit connected to all circuits; The power detection circuit is divided into two parts, namely a first detection circuit and a second detection circuit, wherein the first detection circuit is specifically: The live line voltage input terminal is connected to the current input pin IP1 of the electric energy metering chip U2 through resistor R82, the first detection voltage input terminal is connected to the current input pin IN1 of U2 through resistor R83, the resistor R82 is connected to resistor R83 through capacitors C21 and C23 in sequence, and the resistor R82 is also connected to resistor R83 through resistor R40, the neutral line voltage input terminal is connected to the voltage input pin VP of U2 through resistors R89, R88, R87, R86 and R85 in sequence, and the voltage input pin VP is also grounded through resistor R84 and capacitor C20 respectively, the multiplexing pin SDO and the voltage zero-crossing indication pin ZX of U2 are respectively connected to the light-emitting diodes of optocouplers U10 and U13, the photosensitive transistors of U10 and U13 are connected to the microcontroller U8 in the CPU control circuit, the multiplexing pin SDI and the clock pin SCLK of U2 are respectively connected to the photosensitive transistors of optocouplers U11 and U12, and the light-emitting diodes of U11 and U12 are connected to the microcontroller U8 in the CPU control circuit.

2. A thermostat according to claim 1, wherein the thermostat is configured to identify the open circuit of the load automatically. The CPU control circuit is composed of a single chip microcomputer U8 and its peripheral circuits.

3. An oven light controller that automatically identifies an open load according to claim 1, wherein, The power supply circuit is specifically: Pins 1 and 3 of circuit breaker BD1 are connected to the input voltage AC through a protection circuit. Pin 2 of circuit breaker BD1 is connected to terminal A of the first primary coil of the transformer. Pin 4 of circuit breaker BD1 is connected to terminal A of the first primary coil through capacitor C4. The current detection pin CS of the isolated primary feedback chip U1 is grounded through resistor R1. Terminal B of the first primary coil of the transformer is connected to terminal A of the first primary coil through diodes D2 and D1 in sequence. The node between terminal B and diode D2 is connected to the smart power pin SW of U1. The feedback pin FB of U1 is connected to the two ends of the second primary coil of the transformer through resistors R2 and R3 respectively. Terminal A of the second primary coil is connected to the voltage input pin VDD of U1 through resistor R70 and diode D3 in sequence. Terminal B of the second primary coil is connected to the voltage input pin VDD of U1 through capacitor C2. Terminal A of the transformer secondary coil outputs a 5V voltage through diode D4. Terminal B of the transformer secondary coil is grounded. The output end of diode D1 is grounded through capacitor C3 and resistor R71 respectively.

4. An oven light controller that automatically identifies an open load according to claim 3, wherein, The protection circuit is specifically: The live line AC_L of the input voltage AC is connected to pin 1 of the circuit breaker BD1 through the resistor FR1 and the thermistor R100 in sequence. The neutral line AC_N of the input voltage AC is connected to pin 3 of the circuit breaker BD1. A resistor RV1 and an inductor X3 are connected in parallel between pins 1 and 3 of the circuit breaker BD1.

5. An oven light controller that automatically identifies an open load according to claim 1, wherein, The power detection circuit is divided into two parts, namely a first detection circuit and a second detection circuit, wherein the second detection circuit is specifically: The second detection voltage input terminal is connected to the current input pin IP1 of the electric energy metering chip U15 through the resistor R39, the live wire voltage input terminal is connected to the current input pin IN1 of U15 through the resistor R8, the resistor R39 is connected to the resistor R8 through the capacitors C26 and C27 in turn, and the resistor R39 is also connected to the resistor R8 through the resistor R38, the multiplexing pin SDO of U15 is connected to the light-emitting diode of the optocoupler U14, the phototransistor of U14 is connected to the microcontroller U8 in the CPU control circuit, the multiplexing pin SDI and the clock pin SCLK of U2 are respectively connected to the phototransistors of the optocouplers U16 and U17, and the light-emitting diodes of U16 and U17 are connected to the microcontroller U8 in the CPU control circuit.

6. An oven light controller that automatically identifies an open load according to claim 1, wherein, The temperature detection circuit is specifically: One end of terminal J2 is connected to the 5V input voltage, and the other end is grounded through capacitor C4 and series-connected inductor L5 and resistor R19. The node between inductor L5 and resistor R19 is connected to the microcontroller U8 in the CPU control circuit through resistor R18.

7. An incubator lamp controller that automatically identifies an open load according to claim 1, wherein, The key circuit is composed of 6 sub-circuits with the same structure, and the specific structure is as follows: The 5V input voltage is connected to the ground through the resistor and the button SW in sequence, and the node between the resistor and the button SW is connected to the microcontroller U8 in the CPU control circuit.

8. An oven light controller that automatically identifies an open load according to claim 1, wherein, The controllable output circuit is specifically: The input pin A of the photoelectric coupler U6 is connected to the single-chip microcomputer U8 in the CPU control circuit through the resistor R20, and the two output pins M G1 and M M1 of the U6 are respectively connected to the first output circuit and the second output circuit with the same structure.

9. An oven light controller that automatically identifies an open load according to claim 8, wherein, The first output circuit is specifically: The output pin M of the opto-coupler U6 M1 The output terminal is connected through the resistor R28 and the transistor Q5 in turn, and the two ends of the resistor R28 are also connected in parallel with the resistor R31. The input terminal and the output terminal of the transistor Q5 are also connected with the resistor R27 and the capacitor X1 in turn, and the output pin M of the U6 G1 The output terminal of the Q5 is connected through the resistors R29 and R30 respectively.

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