PBM300PQ07-C

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AC DC Converters

The PBM300PQ07-C is an AC-DC converter that operates on an AC supply voltage of 90-264VAC and its output can range from 18VDC to 26VDC. The PBM300Pq07-C uses a single phase full bridge rectifier circuit, which consists of four semiconductor devices connected in a particular configuration in order to reduce the ripple voltage associated with the AC line input voltage.

The PBM300Pq07-C achieves its power conversion efficiency by operating in a quasi-resonant mode, which is an operating technique that minimizes the current passing through the power components, while maintaining a relatively constant turn-on frequency. This approach helps to ensure that the converter operates with a relatively low level of noise, making it ideal for medical and other sensitive applications.

The PBM300PQ07-C has built-in over-temperature protection, which helps to ensure that the power supply does not overheat and become damaged by prolonged operation at elevated temperatures. The PBM300PQ07-C also integrates a set of EMI filters, which help to limit the level of electromagnetic interference (EMI) generated by the converter and ensure that it meets international regulatory standards.

In order to understand how the PBM300PQ07-C works in more detail, it is helpful to look at the basic circuit diagram of the converter. The rectifier circuit is based on two SCRs (silicon-controlled rectifiers), which are connected in inverse parallel and provide a full wave rectification of the input voltage. One SCR conducts current during the positive half of the AC waveform, while the other SCR conducts during the negative half.

The two pairs of SCRs are then connected to a pair of output capacitors, which helps to store the electrical energy and provide the stable DC voltage required by the load. The capacitors absorb the surge current associated with this rectification process and provide a very smooth output voltage.

The PBM300PQ07-C also incorporates control circuitry that works in conjunction with the SCRs to provide the required output voltage. The control circuit adjusts the duty cycle of the SCR switching cycles, which determines the amount of current that is flowing through the output capacitors, and therefore the output voltage. This helps to ensure that the output voltage is regulated to within a very small tolerance.

In summary, the PBM300PQ07-C AC-DC converter is an ideal solution for applications where a regulated output voltage is needed. It is ideal for medical and sensitive applications due to its low noise operation and built-in over-temperature protection. Additionally, it integrates EMI filters that meet regulatory standards, ensuring that it operates without generating significant electromagnetic interference.

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