*This information is for general informational purposes only, we will not be liable for any loss or damage caused by the above information. In 2021, Allegro MicroSystems went public through an initial public offering (IPO) on the NASDAQ stock exchange. The company is dedicated to delivering innovative and reliable power and sensing solutions that meet the evolving needs of the electronics industry. Allegro MicroSystems also offers custom design and engineering services to meet the specific needs of its customers.Īllegro MicroSystems has a global presence, with sales offices and representatives located around the world. The company's products are designed to meet the highest standards of performance and reliability, and are manufactured using the latest technology and materials. These products are used in a wide range of applications, including automotive, industrial, and consumer electronics.Īllegro MicroSystems is known for its expertise in magnetic sensing technology, which is used in many of its products. The company was founded in 1990 and is headquartered in Manchester, New Hampshire, USA.Īllegro MicroSystems' product portfolio includes Hall-effect sensors, power ICs, motor drivers, and magnetic digital position sensors. High-Voltage,High-Current Darlington ArraysĪllegro MicroSystems is a semiconductor company that designs, manufactures, and markets high-performance power and sensing solutions. High-Voltage, High-Current Darlington Arrays High Voltage High Current Darlington Arrays High-Voltage, High - Current Darlington Arrays We can get rid of auxiliary contacts M 1 and M 2 for interlocks and just use TD 1 and TD 2‘s contacts, since they immediately open when their respective relay coils are energized, thus “locking out” one contactor if the other is energized.Įach time delay relay will serve a dual purpose: preventing the other contactor from energizing while the motor is running, and preventing the same contactor from energizing until a prescribed time after motor shutdown.HIGH-VOLTAGE, HIGH-CURRENT DARLINGTON ARRAYS The careful observer will notice that the time-interlocking functions of TD 1 and TD 2 render the M 1 and M 2 interlocking contacts redundant. In like manner, TD 2 will prevent the “Forward” pushbutton from energizing M 1 until the prescribed time delay after M 2(and TD 2) have been de-energized. When TD 1 times out, the contact will close and the circuit will allow M 2 to be energized, if the reverse pushbutton is pressed. When the stop button is pressed, contact TD 1 waits for the specified amount of time before returning to its normally-closed state, thus holding the reverse pushbutton circuit open for the duration so M 2 can’t be energized. This being the case, the normally-closed, timed-closed contact of TD 1 between wires 8 and 5 will have immediately opened the moment TD 1was energized. If the motor has been running in the forward direction, both M 1 and TD 1 will have been energized. If we use contacts that delay returning to their normal state, these relays will provide us a “memory” of which direction the motor was last powered to turn. Let’s begin by adding a couple of time-delay relay coils, one in parallel with each motor contactor coil. Hat we might like to have is some kind of a time-delay function in this motor control system to prevent such a premature startup from happening. If the fan was still coasting forward and the “Reverse” pushbutton was pressed, the motor would struggle to overcome that inertia of the large fan as it tried to begin turning in reverse, drawing excessive current and potentially reducing the life of the motor, drive mechanisms, and fan. This could be problematic if an operator were to try to reverse the motor direction without waiting for the fan to stop turning. If our hypothetical motor turned a mechanical load with a lot of momentum, such as a large air fan, the motor might continue to coast for a substantial amount of time after the stop button had been pressed. Let’s consider another practical aspect of our motor control scheme before we quit adding to it. The “Stop” switch, having normally-closed contacts, will conduct power to either forward or reverse circuits when released. The color is shown as atwo-letter code, which can be identified by referring tothe Wire Color Code Chart (Fig. which identifies the main circuit, part of the maincircuit, gauge of wire, and color. Now, if either forward or reverse circuits are latched, they may be “unlatched” by momentarily pressing the “Stop” pushbutton, which will open either forward or reverse circuit, de-energizing the energized contactor, and returning the seal-in contact to its normal (open) state. Each wire shown in the diagrams contains a code (Fig.
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