Air circuit breaker Coil-saving

Contactor coil AC passed, it will produce a corresponding inductance, inductive influence of the size of the size of the current in the coil, AC solenoid coil inductance, the core is Air circuit breaker‍ not closed when the inductance is small, a large current through , which is caused by the coil in the suction power of the largest timely reason. When the AC contactor pull into the retention time, due to long-term work in the state coupled with the coil power consumption, temperature rise. AC contactor usually work long hours can produce 50 ℃ ~ 60 ℃ degree heat, the summer plus 30 ℃ ~ 40 ℃ ambient temperature of the coil temperature rise faster. Coil long period of high temperature operation, will accelerate the aging and even burned, AC contactor life will be shortened.

According to AC contactor coil power consumption characteristics of fast rise, by reducing the power consumption and temperature to save energy. According to the internal structure, saving coil is divided into: double winding type, current limiting resistor, double winding self-conversion conversion type and location. Works will use energy-saving coil is usually on its pulsating DC coil retention program run: pull winding generally larger diameter, fewer turns, and thus lower impedance, resulting pull current large; retention winding general smaller diameter, number of turns, the Inverter Power Supply‍ impedance of large, small and therefore holding current. Corresponding increase rectifiers and varistors and film capacitors, the AC contactor is energized to work in DC state, large starting current to ensure a reliable pull-electromagnetic systems, smaller holding current to reduce the retention power, thereby reducing the electrical losses and electromagnetic coil temperature of the system.

CNC Electric Thyristor inverter

Thyristor inverter circuit to convert the direct current into alternating current, which corresponds to a reverse process of the rectifier, is defined as an inverter. For example: The thyristor power transformers‍ electric locomotives, when the DC motor as a generator downhill braking operation, the locomotive of potential energy into electrical energy, trans go to the AC grid. Another example is the operation of a DC motor, brake to make it quickly, but also allows the motor as a generator to run the motor kinetic energy into electrical energy, anti-delivered to the grid. The converter operates in inverter state, if the converter is connected to the AC side of the AC power to DC to AC inverter with a Air circuit breaker‍ frequency counter to the grid to go, called active inverter

mcb circuit breaker Inverter include

Dedicated power inverter

Communications for power inverter   

Frequency inverter powered

Industrial sine wave inverter

Square wave inverter

The role and characteristics of medical Inverter

Due to a variety of different types of medical equipment supply needs, use the most is the centralized power structure. I.e., by a power converter to produce the desired concentration of various voltage levels of the output voltage. Due to its low cost, high efficiency, adjustable output voltage, low output noise, fast dynamic response and other type of equipment is very suitable for medical use, is a medical device is currently Electric transformer‍ the most used type of a power supply. Medical equipment supply program to determine the need to consider the following questions.

Security and isolation is a major difference between the ordinary commercial power and medical supply. Typically, in addition to some experimental analysis class equipment, medical equipment mostly installed near the bed or the operating table, and the operator's distance from the more recent, the shell will often be touched. There are a variety of medical equipment inside the strong, weak parts, if the strength of electrical isolation between the insulated shell material or have a problem, it will be very dangerous. General medical equipment safety testing power supplies must be UL60601-1, C-UL, EN60601-1 safety certification. Inputs and outputs must be more than 4,000V isolation voltage, and low leakage current requirements to meet safety creepage distance requirements. And part of the need for a strong electric double insulation, especially some of them might be more in contact with the enclosure designed to enhance insulation.

Electromagnetic compatibility and immunity to electromagnetic interference

Select the type of equipment to be medical or AC Contactors‍ build a good power supply system must focus on improving the supply of electromagnetic compatibility and electromagnetic interference. Mainly from the following aspects to consider: design. PCB design and layout, in general will contain some of the high frequency power signal, any traces on the PCB can be functioned as an antenna, the length and width of the printed lines will affect the resistance and inductance, thus affecting the frequency respond in a timely manner will be coupled to the RF signal and cause problems through the circuit traces DC signal from adjacent tracks. Medical power supply must be selected so that the big brands, has a strong R & D strength of the company's products, which in the design and production processes can ensure good quality.

Shield

In order to suppress the switching power supply generated by radiation, eliminate the influence of electromagnetic interference from other electronic devices in the medical equipment, the best way is to supply the magnetic shield, the shield and then the entire cabinet or medical devices to a single entity, this is a more effective approach.

Authenticate

General medical device class stage power needs through FCC-B, CISPR22-B, EN55011550226120461000 such as electromagnetic compatibility and immunity to electromagnetic interference testing. Select the completion of these tests not only within the right equipment to ensure the electromagnetic influence Power Transformer‍ other electronic components, and medical equipment can reduce development cycles and time to market prior to the subjects.