- Details
- Category: Converters
Miniature DC-DC converters for powering IGBT gate drive circuits
Murata has launched three series of 6W high isolation DC-DC converters from Murata Power Solutions that, in the form of individual devices, are capable of providing full gate drive power for HB (Half-Bridge), FB (Full-Bridge) and 3P (three-phase) circuits, saving space and cost, while providing optimal performance.
Murata's MGJ6HB, MGJ6FB, and MGJ63P DC-DC converters are designed to simultaneously power high-side and low-side gate drive circuits for silicon/silicon carbide IGBTs and MOSFETs in bridge circuits. These devices feature independent dual, triple, and quad outputs that are externally configurable with a simple circuit to provide positive and negative voltages for gate drive power. By using only one device to power all gate drives in a bridge application, significant space savings of 33–50% are achieved. For example, in a three-phase bridge, the four-output MGJ63P provides isolated power for the three high-side switch drivers and a common rail for the three low-side switch drivers, potentially replacing up to six discrete DC-DC converters.
The DC-DC converters offer a wide 2:1 input voltage range with nominal inputs of 5V, 12V, and 24V, and two, three, or four 24V output channels with high isolation between outputs. The outputs can also be connected in parallel or series. Providing reliable operation in the fastest switching systems, the devices are suitable for DC link voltages up to 3kVDC and feature a dV/dt immunity characteristic of 80kV/microsecond, as well as characterized partial discharge performance, ensuring a long service life.
The design of DC-DC converters includes many inherent features and aspects that improve performance, reliability, and repeatability. These include a planar transformer, short-circuit and overload protection for robust operation under system fault conditions, and a very low coupling capacitance of typically 15 pF, which reduces system EMI problems. A frequency synchronization pin simplifies the EMC filter design, and an enable pin provides energy savings.
A UL60950 recognition application for reinforced insulation is pending, which will reduce the overall cost of system approval. Similarly, approvals for ANSI/AAMI ES60601-1, two MOOPs, and two MOPPs with different system voltage levels are pending, and when obtained, these will simplify system approval for medical applications.
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