Термисторный датчик температуры для электроприборов

Как все знают, Мелкая бытовая техника , как популярная домашняя посуда, имеет не только функцию обогрева, но также имеет множество автоматических функций. Например, автоматическое сохранение тепла, автоматический кипячение воды, автоматическое приготовление риса, автоматическое приготовление супа и другие функции. Реализация всех этих автоматических функций требует, чтобы мелкая бытовая техника могла точно измерять и контролировать температуру.. Существующая мелкая бытовая техника в основном использует датчик температуры для измерения температуры.. Такой как：

As shown in FIG. 1, it is a schematic structural diagram of a conventional Small appliances temperature sensor having a probe 2 for contacting the Small appliances panel 1. The probe 2 is a thermal sensitive device such as a thermal resistor. A rubber seat 3 made of a heat-insulating material fixes the probe 2 on the top. Then, the rubber base 3 is installed in the center of the Small appliances panel 1, so that the probe 2 is fully in contact with the Small appliances panel 1, and the lead 4 is also led out of the probe 2. The temperature signal is transmitted to the microprocessor of the Small appliances by the lead wire 4 for further processing. With this Small appliances temperature sensor, since the area of the probe 2 is limited, the contact area with the Small appliances panel 1 is also limited. Кроме того, since the shape of the contact portion of the induction cooktop plate 1 and the probe 2 may be uneven, it is not possible to guarantee complete contact between the two. Более того, as the rubber base 3 ages during use, the possibility of incomplete contact increases, which causes the temperature measured by the probe 2 to be inconsistent with the actual temperature of the Small appliances panel 1, thereby affecting the use of the Small appliances.

The temperature sensor on the Small appliances is actually a semiconductor thermistor with a negative temperature coefficient. The resistance value will decrease as the temperature itself rises, and the temperature will rise, and the voltage across the resistance will change through the change in resistance. If it is not connected, the Small appliances will cause an alarm and it will be dangerous.

В целом, two types of resistors with the same specifications are used inside the Small appliances: One detects the furnace surface temperature, One detects the operating temperature of IBGT. When you open the top cover on the Small appliances, there is a circular element in the center of the base, which is the temperature sensor for the Small appliances.

The temperature control of the Small appliances is transmitted to the IC chip and converted to a temperature value according to the resistance value of the thermistor. In order to meet the different temperature heating methods. The other temperature sensor is fixed on the heat sink aluminum plate or squeezes the power tube. Of course, some temperature sensors are installed on the circuit board near the heat-dissipating aluminum plate, which looks the same as the middle under the panel.

Common troubleshooting methods of Small appliances:
1. The fan does not turn: Check the fan power supply and check whether the voltage at the 18V switching power supply is normal.

2. The fan has noise or rotates: Check if the CPU's crystal welding position is correct, and whether the pads are de-soldered.

3. Power is not adjustable: Check whether the CPU works normally (measure the voltage of the relevant pins), and see if the potentiometer (VR) on the motherboard that regulates the current is normal.

4. Start without heating: Check whether the temperature-sensitive thermistor is short-circuited, check whether the inductor L3 is soldered or damaged, and check whether multiple high-power resistors on the motherboard are damaged.