RLY70000

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Solid State Relays (SSR) are becoming increasingly popular for their ability to quickly respond to external commands and provide highly reliable load switching. The RLY70000 series from Renesas is an example of a Solid State Relay family that has found its way into many applications. In this article, we will discuss the intended application fields for RLY70000 and how its working principles help to meet the demands of these applications.

The RLY70000 is used for circuit isolation, contact replacement, and external control. Its good isolation characteristics make it suitable for circuit isolation applications where unwanted electrical noise or contact leakage currents could be an issue. In such cases, the series noise blocking features are particularly beneficial. This is further compounded by its immunity from inductive interference (EMI) and its low on resistance.

The series is capable of functioning as a contact replacement, replacing the need for an electromechanical relay across many different contact switching applications. For such a duty, it has the capacity to be controlled from an external Digital Input signal. This allows for greater flexibility and a wider range of operational use cases than a traditional mechanical relay. In addition, the contact closures can be accomplished at rate of up to 5kHz.

The main principle of operation for the RLY70000 series SSR is a bridge-switching impedance converter. This is a non-polarized switch that works by connecting either side of a load across a low-impedance point for current conduction and disconnects when the voltage is reversed. This provides a high level of safety and prevent any electrical arcing between the contacts which can cause reduced durability and wear.

The RLY70000 features a voltage range of 2 to 240V AC/DC, making it suitable for a broader range of industrial, telecoms, and instrumentation applications. It has high AC input impedance and can provide stable performance up to 300kHz, making it an ideal choice for applications requiring high switching speeds and power conditioning.

The series also provides a number of more advanced features such as LED indicator, an internal snubber, thermal protection, and optional optocoupler isolation. The integrated snubber can be used to improve contact life and reduce contact chattering when switching pulse durations are too short. The series has LED indicator, which shows the method in which it is operating, allowing quick observable feedback as to the current status. The thermal protection feature helps to reduce heating troubles in industrial and consumer refrigerator applications where the SSR is used as an overload and/or temperature sensing device.

These features, combined with the superior switching speeds and immunity to electrical noise, make the RLY70000 series SSR an excellent choice for a wide range of industrial applications. Its ability to perform as a contact replacement, utilize external digital commands, and provide reliable performance at high switching speeds makes it a cost-effective solution to many industrial switching and control requirements.

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