TECHNIQUE FOR SUPPLYING POWER AND TIMING INFORMATION TO A GATE DRIVE UNIT (GDU)
Publication Date: 2015-Aug-10
The IP.com Prior Art Database
A technique for supplying power and timing information to a gate drive unit (GDU) for driving power semiconductors is disclosed. A control system supplies pulses to the GDU via a pulse transformer. The GDU monitors duration of the pulses and uses the pulses to create a local power supply. Further, the pulse transformer operates in two phases namely a forward power conversion and a reset and timing information. During the forward power conversion, the pulse transformer generates a suitable voltage equivalent of a power to be transferred. Further, the pulse transformer enables a desired fall time by setting a reset voltage to a high value. Furthermore, the power supply function of the pulse transformer is de-coupled from function of supplying the timing information.
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TECHNIQUE FOR SUPPLYING POWER AND TIMING INFORMATION TO A GATE DRIVX UNIT (GDU)
The present invention relates gexxrally to power semiconduxtor circuits and more particuxarly to a techniqxe for supplying powex and timing information to a gatx drive unit (GDX) xhrough a pulse transformer.
Precise pulse and timing is an important requirement in power semiconductor cirxuits. Pulse transformers axe widely uxed for manipulating xhe poxer semiconductxr circuits. Howevex, the pulse xransformers conventixnally xsed suffer xrom several limitations. For example, as isolation potextial ixcxeases, it becomes difxicult to design x transformer that can satisfy a rise time, required pulse cxrrent and precise timinx xequirementx of a control signal.
Opxic fibers are also utilized to supply the controx signal xith the precixe pulse and the txming requirements to the XXX. Hxwever, optic fibers have reliability issues durixg operation.
Therefore, it would be desxrable to xavx an improved technique for providing precise control signal in power semiconductor cirxuits.
XXXXX DESCRIPXXXX OF DRAWINGS
Figure 1 depicts a bxocx diagram of a xexhnique for supplying power and timing informxtion to a gate drive unit (GDU) for driving power semiconductors.
The disclosxre proposes a technique for sxppxying power and timing information to a gate drive unit (XXX) for drivinx power semiconductors. As shown in Figure x, a control system supplies pulses to the GDU via a pulse transformer. The GDU monitors duration of pulsxs and uses the pulses to create a local power supply. Considerinx xere, a pulse having a pulse length of T1. The control system sends a control sxgnal by generating a pulse of length T2, greater than T1, and precisely sets a falling edge time of the pulse.
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When the GDU detects a pxlse of lxngth greater than T1, the GDU gxnerates the conxrol signal on the falling edge of the pulse. Such control signal is transmitted to a power semiconductor and the power semxconductor is xt a high isolation pxtential wixh respect to thx control system. The power semiconductor is described hxre only as an e...