OVP (Over Voltage Protection) — Prevents Output Overvoltage Damage

During AC-DC or DC-DC conversion, control circuit failure may cause the output voltage to exceed the rated level, damaging load components such as ICs, sensors, or motor controllers. OVP monitors the output voltage and shuts down or disables the output once it exceeds the preset threshold. Some models adopt a latch-off design (requiring power recycle) or auto-recovery function.

🔹 Example: In industrial automation control boards, even a brief voltage surge may destroy the control IC. A module with OVP can instantly shut down the output to protect the main board.

OCP (Over Current Protection) — Prevents Overcurrent-Induced Overheating or Damage

OCP monitors output current and limits or stops it once it exceeds a safe range. Typical control methods include:

• Constant Current Limit: Maintains a fixed current output.
• Fold-Back Limit: Gradually reduces current to minimize heat buildup.
• Hiccup Mode: Periodically turns output off and automatically restarts once the fault clears.

ARCH power products primarily adopt the “Hiccup Mode” protection method, which effectively prevents overheating and damage caused by excessive current, and automatically recovers once the fault is removed—making it ideal for long-duration industrial applications.

🔹Example: During motor startup or capacitor charging, a sudden inrush current often triggers OCP. The hiccup design prevents permanent damage and allows automatic recovery.

OPP (Over Power Protection) — Prevents Output Power from Exceeding Rated Capacity

Output power = Voltage × Current.

When excessive load causes the output power to exceed design limits, components may overheat and shorten their lifespan. OPP detects overpower conditions and either reduces output or enters protection mode. In some designs, OPP and OCP operate together to maintain safe energy levels.

🔹 Example: In multi-output power supplies, if one channel is overloaded, OPP prevents the entire system from being affected.

OTP (Over Temperature Protection) — Shields Components from Thermal Stress

At high power or in sealed environments, key components such as transformers, MOSFETs, and electrolytic capacitors can reach critical temperatures. OTP uses built-in thermal sensors (NTC / thermistors) to monitor these points. When temperature exceeds the threshold, the output is shut down or derated. The system automatically restarts once the temperature returns to normal, ensuring stable operation and component longevity.

🔹 Example: Outdoor monitoring systems, solar inverters, and robotics power supplies often rely on OTP to prevent heat-related failures in fluctuating environments.

SCP (Short Circuit Protection) — Prevents Catastrophic Damage from Short Circuits

If the output is accidentally shorted, current can surge to several times its rated value, destroying switching transistors or rectifiers. SCP detects this rapid rise within microseconds and immediately limits or cuts off output. Once the short is cleared, the power supply automatically resumes normal operation.

🔹 Example: During testing or maintenance, SCP prevents operator errors from permanently damaging the power supply.