Thermistor is a semiconductor component whose resistance changes significantly with the change of the (sensed) temperature. Its called NTC thermistor when its resistance decreases when the temperature increases. NTC thermistor is widely used in home appliances. There are some main parameters for NTC thermistor: 1. Self-heating: When we measure or use NTC thermistor, there is always a current going through it, and this current heat up the thermistor. When self-heating occurs, the resistance of NT...(more)
Continued from last article 2. Zero Power Resistance: Zero power resistance is the most basic parameter of NTC thermistors. The resistance given by the manufacturer belongs to zero power resistance. However, zero power confuses some customers since zero power doesnt exist in physical meanings. Actually, the change of the resistance caused by self-heating can be neglected when comparing with the total measurement error. Generally, the zero power measurement of NTC thermistor is made in thermostat...(more)
ATEC24V10A1 is a Peltier controller with high output voltage (24V) and high output current (10A), as shown in Figure 1. ATEC24V10A1Peltier controller is designed and produced to drive high power TECs ( thermo-electric coolers ). It has high efficiency(more than 98%) and high temperature stability (0.01C). This Peltier controller has a wide input voltage range, so based on the voltage signal, it can set the output current limit and the set-point temperature that can be programmed externally. Figu...(more)
Thermal electric cooler ( TEC ) is a Peltier module, which has the capacities of heating and cooling at the same time. As TECs have many advantages such as no moving parts, no noise, and environment friendly, etc, they have been widely used in many fields. Take the laser system for an example. TEC can ensure the laser system works at a constant temperature so that the lasers will output a laser beam with stable wavelength, constant power and low optical noise. In order to use TECs better, our co...(more)
NTC thermistors are widely used in temperature measurement due to its low cost and characteristics that the resistance changes with the temperature. Generally, use a NTC thermistor and a precision resistor in series. The resistance change of NTC thermistor is indicated by voltage change, which can enter into the A/D input port of comparator circuit or SCM. Amplification is not necessary, and the circuit is very simple. Besides proper R value and B value, it should take consideration of measuring...(more)
Continued from last article. It needs to be noted that the value is the parameter of NTC thermistor before the secondary encapsulation by most of the manufacturers. Although the current determined by this parameter wont produce self-thermal, but it affects the selection range of the parameter value. Thats because the max. non self-thermal power is increased after secondary encapsulation. The way to determine the current range by dissipation factor is to determine the accuracy of NTC thermistor f...(more)
Continued from last article. It needs to be noted that the value is the parameter of NTC thermistor before the secondary encapsulation by most of the manufacturers. Although the current determined by this parameter wont produce self-thermal, but it affects the selection range of the parameter value. Thats because the max. non self-thermal power is increased after secondary encapsulation. The way to determine the current range by dissipation factor is to determine the accuracy of NTC thermistor f...(more)
Peltier controller is an electric module, which is designed and produced for driving a thermal electric cooler ( TEC ) to stabilize temperature. Peltier controller has many advantages including compact size, high efficiencyand high reliability. Figure 1 is the physical photo of an actualPeltier controller. Figure 1. The photo of an actual Peltier controller In order to avoid the inferences between the controller and other electronics, Peltier controller is packaged in a 6 sided metal enclosure....(more)
