AQV253

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Solid State Relays (SSRs) are usually utilized for industrial applications instead of mechanical relays due to its superior performance. AQV253 is one of such SSRs which is widely used in different applications. This article gives an overview of the AQV253, including its application fields, respective working principle and properties.

Application Field

The application fields of AQV253 mainly depend on its structure and characteristics. It is a replacement for the relay, and an independent chip integrated with a pair of thyristors and driving circuit. It can control the rated load of 1000VAC, and its trigger power supply is 5-24VDC or 5-220VAC. Therefore, it is suitable for controlling lights, fans, pumps or motor starters, and other electrical loads that require on/off relay control.

AQV253 is also widely used in other applications. It can function as a one-way four-way thyristor static switch, rectifiying full-wave, controlling of the inrush current, performing soft-startup on the load, and controlling of the high-voltage direct current.

Working Principle

The AQV253 is driven by a bistable control circuit. It has two static states: complement and off. In the complement state, the circuit output is the highest, allowing AC current to flow through the load. When the circuit output is off, it triggers the thyristors to open, thereby preventing current flow through the load and thus cutting off power.

The operation of AQV253 SSR can be simplified as follows: when applied with a signal voltage, the two output relays are activated at the same time and the SSR is energized. Then the SSR actuator circuit will turn on the thyristors, so that the AC voltage will be switched to the corresponding output terminal, enabling the load to be connected.

Properties

The AQV253 SSR has several advantageous properties as coupled with its replace relay. It has a high conducting rate with high isolation voltage between the control end and load end, allowing it to be used in many high voltage applications. In turn, it provides higher switching speed than mechanical relays, which is helpful when operating large loads over a wide range of AC or DC input voltage. It also has an oscillator frequency of about 1kHz, allowing it to provide a reliable semi-conductor switching.

This SSR has low control power consumption, giving users the added benefit of being able to operate it with smaller microcontrollers due to the lower power requirements. It also has a wide operating temperature range from -20℃ to +85℃, making it suitable for use in extreme environments. Overall, the AQV253 SSR is a great choice for many different applications due to its wide range of properties.

In summary, the AQV253 is a widely used Solid State Relay which is suitable for controlling lights, fans, pumps, motor starters and other electrical loads that require on/off relay control. It has two static states: complement and off, and it is driven by a bistable control circuit. It has superior performance with a high conducting rate, high isolation voltage, robust switching capacity, low control power consumption and a wide operating temperature range.

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