Abstract: The principle and application of temperature and current sensing ICs produced by Raytheon and Teledye Components in the United States are introduced in this paper. Taiqin Dyne's solid-state thermal switch IC replaces the expensive, vibration-sensitive bimetallic temperature sensor. Leitong's IC device detects the leakage current of 5mA and molds it into a flexible wire device. Factory's products to protect the safety of people and equipment. The common characteristics of the two products are small size and low price, each only about one dollar. Temperature and current sensing ICs are products that will enter homes, offices and factories.
U.S. inexpensive chip body consists of two mine to the ground and Thai dynes element manufactured, contribute to each part of the electrical or electronic device to overcome the inherent dangers two kinds - water and high temperature. Taiqin Dyne IC is the most important member of the new family of solid-state thermal switches, replacing the expensive, vibration-sensitive double-layer metal sheet temperature sensor that is commonly used in applications ranging from coffee workers to home heating thermostats. The Taiqin Dyne device is a low-power, two-wire ground fault intermittent (GFI) controller. Since the design is for use in hair dryers, it can be used as a safety component in items such as hair dryers. Because the purpose of the two ICs of Taiqin Dyne and Leitong is to provide consumers with low-cost products: to achieve a small size and the lowest possible price.
Both the SC620 and TSC621 in the Taiqin IC are temperature-sensing: the TSC620 uses a monolithic ion implantation resistor with an absolute accuracy of ± 30 ° C, while the TSC621 uses an external thermistor. The TSC620 can replace the instantaneous action thermal switch installed on many devices or motors, providing simple on-off protection and / or control. These ICs use high and low temperatures, user programmable (with two resistors) setpoint input, and a group of three control logic output. They provide a simple, multi-purpose, multi-value temperature alarm or control system. A TSC620 and less than two dozen inexpensive components can make a complete household heating-cooling thermostat. 
Figure 1, when the temperature of the chip rises to the specified upper and lower settings, the TSC620 temperature sensing switch produced by Taiqin Dyne Components is programmed to sense. When it reaches the upper setting value, first turn on the MOSFET, and then turn on the electric fan. When its temperature drops to the next set value, make it shut down.
Connect a 90KΩ to 200KΩ resistor between each programming input and the power supply that determines the high and low temperature settings (Figure 1). For these two logic outputs, the lower and upper limits follow the following truth table: Whenever the chip (or external thermistor) rises to the temperature programmed by their respective resistance programs, the lower and upper limits of the output become high . That is, when the temperature rises, the lower limit output first becomes higher, and then the upper limit output becomes higher. When the temperature of the chip (or thermistor) drops, about two degrees below its programmed value, the output limits are reduced. In a typical application, when the lower limit becomes high, it can turn on the electric fan and warn the owner (person or silicon). If the temperature rises enough to cut off the upper limit, the system may stop working and turn off the alarm.
When the sensed temperature rises to the upper set value, the control logic output becomes high, and when it falls below the lower set value, the control logic output becomes low.
No more shocking people!
The working principle of the lightning device is to cut off two AC lines in less than 24ms if an electric shock occurs. This means that it must detect a leakage current of 5 or 10 mA (5 mA in the United States and 10 mA in Europe) and cut off the line when the frequency is 50 Hz or 2 Hz less than 2 Hz. These two main characteristics affect the cost, design and time to market of the hair dryer. In order to detect and interrupt the leakage current of the ground fault, the RV4140 solves from the other side: there is no need to change the design of the existing hair dryer. Only one two-wire line is required between the wall outlet and the hair dryer (Figure 2). 
The current solution is to require three wires from the GFI to the hair dryer, and this third wire is connected to the metal plate inside the hair dryer. This metal plate and the third wire increase the cost. For each existing and newly designed hair dryer, this metal plate needs to be redesigned, and the tooling needs to be changed, which further increases the cost and design time. Finally, each new design and each redesign must be UL certified or recertified, thus extending the time to market.
RV4140 and its circuit eliminate this kind of problem. It is shaped as a cord device and once certified it can be used to connect to any hair dryer or to any other equipment. In order to further reduce the cost and size, the RV4140 contains a full-wave bridge rectifier, which must be added to the general-purpose GFIIC (including Thunder RV4145).
The core part of the detector is a current transformer with a ring-shaped laminated iron core or a solid iron core. The ground fault produces a difference between the live and neutral currents.
The amplified and rectified current produces an error voltage on pin I. If this error voltage is greater than the reference voltage on pin 3, the comparator C is turned off and the SCR is activated, thus disconnecting the relay and the circuit to the hair dryer.
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