BridgeSwitch Family Application Note: 1-Phase BLDC Motor Drive
■The BridgeSwitch™ family of integrated half-bridges dramatically simplifies the development and production of high-voltage inverters for permanent magnet (PM) or brushless DC (BLDC) motor drives. The half-bridge architecture enables BridgeSwitch design flexibility for driving single or multi-phase motors. The high-level of integration, highest performance without heat sink, and integrated safety and reliability make it ideally suitable for the latest generation of high performance inverters.
■BridgeSwitch incorporates two high-voltage N-channel 600 V rated power FREDFETs with low and high-side drivers in a single smalloutline package. The internal power FREDFETs offer ultrasoft and ultrafast diodes ideally suited for hard switched inverter drives. Both drivers are self-supplied eliminating the need for an external auxiliary power supply. A unique feature provides an instantaneous phase current output signal simplifying implementation of sensor-less control schemes. The low-profile, compact footprint surface mount package offers extended creepage distances and allows heat sinking of both power FREDFETs through the printed circuit board.
■BridgeSwitch offers internal fault protection functions and external system level monitoring. Internal fault protection includes cycle-bycycle current limit for both FREDFETs and two level thermal overload protection. External system level monitoring includes DC bus sensing with four under-voltage levels and one over-voltage level as well as driving external sensors such as an NTC. The bi-directional bussed single wire status interface reports observed status changes.
■BridgeSwitch is very well suited for 1-phase motor drive applications. The high level of integration and simplicity of design enables a significant reduction in the overall component count resulting in low system cost and a highly compact design.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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June 2020 |
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Rev. A |
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AN-87 |
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1.5 MB |
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