Power Mosfet Switch
#power mosfet
#solid-state switch
#overcurrent protection
#current sensing
#fast switching
#circuit protection
#floating circuit
#high-speed switch
Description: This solid-state switch detects and interrupts an overcurrent condition within 2 microseconds. It allows the circuit to float. IC1 operates at 150 kHz, and the full-wave doubler D1/D2 provides 15 V to the gate of Q1. An overcurrent sensed across R1 triggers Q3, removes gate bias from Q1, and opens the circuit formed by the full-wave bridge and Q1. C1 and R3 enable the circuit to manage surges.
The described solid-state switch is engineered to provide rapid overcurrent protection in electronic circuits. The operation begins with the sensing mechanism that monitors the current flowing through resistor R1. When the current exceeds a predetermined threshold, the voltage across R1 rises, triggering transistor Q3. This transistor acts as a control switch, which, upon activation, cuts off the gate bias to Q1, effectively disconnecting the load from the power source.
The use of a full-wave bridge rectifier comprising diodes D1 and D2 ensures that the circuit can efficiently convert AC input into a stable DC output. The output voltage of 15 V is crucial for driving the gate of Q1, which is typically a MOSFET or an IGBT, allowing for rapid switching capabilities. The frequency of operation, set at 150 kHz, indicates that the circuit can handle high-speed applications, making it suitable for various industrial and consumer electronics.
Capacitor C1 and resistor R3 are integrated into the design to provide additional robustness against voltage surges. C1 functions as a decoupling capacitor, smoothing out voltage spikes that could potentially harm sensitive components. R3 serves to limit the inrush current during transient conditions, ensuring that the circuit remains stable under fluctuating load conditions.
Overall, this solid-state switch design exemplifies modern approaches to circuit protection, utilizing rapid response times and efficient power management techniques to enhance the reliability and durability of electronic systems. This solid-state switch senses and interrupts an overcurrent condition within 2 /is. II allows the circuit to float. IC 1 runs at 150 kHz and full-wave doubler D1/D2 provides 15 V to the gate of Ql. An overcurrent sensed across Rl triggers Q3, removes gate bias from Ql, and opens the circuit formed by the full-wave bridge and Ql. CI and R3 allow the circuit to handle surges.
The described solid-state switch is engineered to provide rapid overcurrent protection in electronic circuits. The operation begins with the sensing mechanism that monitors the current flowing through resistor R1. When the current exceeds a predetermined threshold, the voltage across R1 rises, triggering transistor Q3. This transistor acts as a control switch, which, upon activation, cuts off the gate bias to Q1, effectively disconnecting the load from the power source.
The use of a full-wave bridge rectifier comprising diodes D1 and D2 ensures that the circuit can efficiently convert AC input into a stable DC output. The output voltage of 15 V is crucial for driving the gate of Q1, which is typically a MOSFET or an IGBT, allowing for rapid switching capabilities. The frequency of operation, set at 150 kHz, indicates that the circuit can handle high-speed applications, making it suitable for various industrial and consumer electronics.
Capacitor C1 and resistor R3 are integrated into the design to provide additional robustness against voltage surges. C1 functions as a decoupling capacitor, smoothing out voltage spikes that could potentially harm sensitive components. R3 serves to limit the inrush current during transient conditions, ensuring that the circuit remains stable under fluctuating load conditions.
Overall, this solid-state switch design exemplifies modern approaches to circuit protection, utilizing rapid response times and efficient power management techniques to enhance the reliability and durability of electronic systems. This solid-state switch senses and interrupts an overcurrent condition within 2 /is. II allows the circuit to float. IC 1 runs at 150 kHz and full-wave doubler D1/D2 provides 15 V to the gate of Ql. An overcurrent sensed across Rl triggers Q3, removes gate bias from Ql, and opens the circuit formed by the full-wave bridge and Ql. CI and R3 allow the circuit to handle surges.
Car lamp failure detector
In Fig.1 see a DC current sensing switch, in which the current is applied from an 8 to 16 Volt supply. The R1 value is chosen so that it generates roughly 100 mV at the required trip current. In Fig....
Sense automobile high-side current with discrete components
This design concept originated from the lack of access to advanced integrated circuits (ICs) that are capable of sensing current. A discrete circuit was required that could be easily constructed while still maintaining accuracy comparable to that of modern ICs....
Current sensing of the rails circuit diagram
The LTC1043 can be induced through any of its current shunt supply rails. Many cells and solar system applications have this feature. If the reference point is grounded, the voltage output of an unloaded amplifier is minimal, allowing the rail...
Aeration ponds remind circuit
A and B are oxygen electromechanical motors operating in a two-phase and three-phase power system. Tl and T2 are wound around the exterior of two current sensing coils. Under normal power supply conditions, Tl and T2 connect to a rectifier...
High Side Current Sensing for Low Side Switching
The AD8205 can be utilized to create a high-side current sensing circuit with a low-side switch. In this configuration, an inductive load (such as a solenoid) and a resistive shunt are incorporated. The resistive shunt is positioned on the high...
Current Sensing Slave Power Switch
Switch on one unit, and everything else you need turns on automatically. This can save the tedium of turning on half a dozen different things, when one should be enough! This is another project created purely from necessity. In my...
A third power supply overcurrent protection circuits
Both circuits are designed solely for overcurrent protection in power supply applications.
The circuits in question serve as critical components in safeguarding power supply systems from overcurrent conditions. Overcurrent protection is essential in preventing damage to electrical components and ensuring...
High-frequency characteristics are improved power MOSFET amplifier
The circuit consists of three identical basic stages, with the second stage featuring a differential output from the power MOSFET, 2SJ77. A current mirror circuit utilizing 2SK214 is implemented. The operating current is 6mA; however, due to the power supply...
Current sensing in supply rails
This capability has wide application in battery and solar-powered systems. If the ground-referred voltage output is unloaded by an amplifier, the shunt can operate with very little voltage drop across it, minimizing losses. The LTC1043 can sense current through a...