Mindray BeneHeart D6 Defibrillator Energy Discharge Capacitor QR232YW185V21A 185μF 2350V

Mindray BeneHeart D6 Defibrillator Energy Discharge Capacitor QR232YW185V21A 185μF 2350V

About Capacitor

The capacitor specifically replaces the old expensive high volume solution with an economical low volume solution. Use capacitors with a voltage of about 450V, a capacity of about 680uF, small size, low impedance, long life, and fast charging and discharging. In this type of circuit, it is easy to obtain an equivalent capacitor with a withstand voltage above 2000V and a capacitance of about 120uF, which can meet the requirements of the high-voltage energy storage capacitor of the defibrillator, thereby reducing the size and cost of the defibrillator.

The high voltage energy storage capacitor is the main component of the defibrillator and is used to store energy. When a patient requires defibrillation, the defibrillator first charges the high-voltage energy storage capacitor. Once the charged energy reaches a certain value, the defibrillator releases the energy to the patient's heart on the energy storage capacitor to complete the defibrillation process.

High-voltage energy storage capacitors require a withstand voltage greater than 2000 V and a capacitance of approximately 120 uF. To protect the capacitor and peripheral circuit components, other additional circuits are often present. At the same time, this high-voltage energy storage capacitor requires low impedance, long life and high-frequency charging and discharging.

The current situation is that high voltage capacitors are very large, and the capacitance cannot be very large, often less than 10uF; The internal resistance cannot be very small. Large internal resistance causes the capacitor to heat up and reduces the instantaneous power output value of the capacitor. After repeated use, the life of the capacitor will be significantly reduced.

Only a few countries in the world can produce capacitors meeting the requirements of such capacitors with voltage above 2000V, capacity around 120uF, small size, low impedance, long life and load and rapid discharge.

To reduce circuit instability caused by capacitance variations of the capacitor, each capacitor Cx is connected in parallel with a protective resistor Rx. This resistor is a high-performance resistor with high voltage strength, it has a high resistance value and practically does not discharge. However, the series resistance network formed by this resistor distributes the voltage evenly to each capacitor during charging; At the same time, this resistor also ensures a self-discharge circuit for the capacitor, so that the device does not have to be completely discharged during self-testing or charging. Under certain conditions, the capacitor energy can be released automatically, improving the safety of the instrument.

When generating a bidirectional pulse stream, an H-bridge must be used to reverse the polarity of the AED. At this time, the residual voltage on the human body is equivalent to that of a battery, which immediately produces a high voltage at both ends of the capacitor, which is higher than the holding voltage of the capacitor. This can damage the capacitor, shorten its lifespan and, in severe cases, even cause an explosion. In this case, the DX parallel diode at both ends of each capacitor discharges the residual electricity of the human body through the discharge circuit, fulfilling the purpose of protecting the capacitor.

Specification of Mindray BeneHeart D6 Defibrillator Energy Discharge Capacitor QR232YW185V21A 185μF 2350V

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