RO-0515S/HP application field and working principle

The RO-0515S/HP is a DC-DC converter with high power, wide operating temperature and wide input voltage range. It can provide 24V output voltage and output current up to 20A. It is suitable for industrial automation equipment, security and surveillance equipment, medical equipment and communication devices.

The RO-0515S/HP is specially designed with a synchronous rectifier to ensure full load efficiency up to 98%. It also adopts multi-phase interleaved PWM conversion technology and input EMI filter circuit, which can effectively reduce the radiation influence and improve the anti-noise performance. The built-in soft start circuit can reduce inrush current without external components. With constant current / voltage mode, the output voltage has automatic adjustment function.

The RO-0515S/HP is a synchronous rectifier DC-DC converter, which is composed of four parts: controlled rectification, soft switch. Constant voltage regulation, constant current regulation. The working process of the converter is roughly as follows:

• The input alternating current is rectified into DC current by the controlled rectification circuit, and then adjusted to the required voltage level by the switching circuit. The high frequency switching capacitors reduce the size of the components and the peak current of the power components. In addition, the switching current only occurs between the two opposite switches, which is the most basic condition of zero current switching.

• The constant voltage circuit is used to regulate the output voltage. The error signal of the output voltage and the voltage reference value comparators in the voltage loop will be amplified to control the duty cycle of the converter. The constant voltage control can make the output voltage keep in the vicinity of the set value.

• The constant current control circuit is used to regulate the output current. When the load current is greater than the set value, the duty cycle of the controller will be reduced, and the load current will be limited to the set value. When the load current is less than the set value, the duty cycle of the controller will be increased, so that the output voltage can be increased and the load current is equal to the set value.

• The soft switch circuit is used to prevent inrush current. In the process of switching on, the power switch generates a large inrush current when it is turned on due to the charging of the output filter capacitor. Under the control of the soft switch circuit, the power switch can be turned on in a progressive manner, so that the inrush current is reduced to its minimum.

In addition, the RO-0515S/HP also has a variety of protection functions, such as short circuit protection, output overload protection, input reverse polarity protection, etc., which enhance the stability and reliability of the equipment.