Rated zero power resistor R25 Zero power resistance refers to the very low power consumption added to PTC thermistor when measuring PTC thermistor value at a certain temperature, so that the change of resistance value of PTC thermistor cause....
1. PTC thermistor for temperature compensation and current limiting The shape of the thermistor is shown in the figure, and the main characteristic parameters are shown in the table. 2.MZ2 type energy-saving lamp soft starter thermistor The....
White LEDs are voltage sensitive devices. In actual work, the current is 20 mA, but the current is often increased due to various reasons in use. If no protective measures are taken, the LED will be damaged after the increased current exceed....
Working Principle of Overcurrent Protection Circuit When the circuit is in normal state, the current of PTC thermistor for over-current protection is less than the rated current, and the PTC thermistor for over-current protection is in norm....
Current Detection Using Current Sensor The working principle of the overcurrent detection sensor is shown in Figure 1. The converter secondary current obtained by the converter is converted to a voltage by I/V. After the voltage is DC, the....
Electronic protection circuit has the characteristics of high-speed current cut-off and easy recovery. It can be used as over-current protection device in any DC circuit. However, the protection circuit using the common fuse has a slower ove....
1. The first part is the resistance sampling, the load and R1 are connected in series, as we all know. The currents in series are equal. The voltage on R2 changes with the current of the load, the current is large, and the voltage across R2....
Causes of lightning surge 1) Lightning strikes (mainly indirect lightning): For example, lightning strikes an outdoor line, and a large amount of current flows into an external line or a grounding resistor, thereby generating an interference....
Positive temperature coefficient thermistor (PTC) element as a new overcurrent protection. In recent years, it has been widely used in the user interface circuit of the program-controlled switch to prevent high-voltage lightning strikes and....
This article describes the shape, function, and detailed parameters of various NTC (negative temperature coefficient) thermistors. I. Ordinary NTC Thermistor Ordinary NTC thermistors are suitable for temperature compensation of AC and DC ele....