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Staggered switching in a load driver

A driver and interleaved signal technology, applied in the field of interleaved switching in load drivers, can solve problems such as slow switching

Active Publication Date: 2018-10-09
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To avoid overshoot / undershoot from these cable reflections, the devices driving the motor and cables are switched slower to limit the voltage transition slew rate, thus resulting in a trade-off between switching time and switching losses

Method used

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  • Staggered switching in a load driver
  • Staggered switching in a load driver
  • Staggered switching in a load driver

Examples

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Embodiment Construction

[0014] at lower drain / source voltages from V DS switch to a higher drain-source voltage V DS , or from the higher drain-to-source voltage V DS switch to a lower drain / source voltage V DS During, some electrical systems may experience drain / source voltage V DS harmful overshoot and undershoot. The voltage overshoots on rising edges and undershoots on falling edges. Due to the drain / source voltage V DS The inherent inductance and capacitance caused by the high frequency switching of the device can cause undershoot and overshoot. V DS The higher the dv / dt (also known as "slew speed"), the higher the frequency components in the system. These high frequency components can propagate through the electrical system driving the load (eg, a motor), causing electromagnetic interference that can lead to dielectric breakdown at the load.

[0015] Embodiments described herein include converters that may be used to drive loads. The disclosed converter can overcome the above-mentioned...

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Abstract

The invention relates to staggered switching in a load driver. An apparatus 100 comprises multiple impedances 153,163,173,183 and multiple pairs of transistors (TH1, TL1)(TH2, TL2)(TH2, TL3)(TH4, TL4). Each pair connects to an impedance 153,163,173,183. Each pair includes high and low side transistors (TH1, TH2, TH3, TH4)(TL1, TL2, TL3, TL4). The high side transistors (TH1, TH2, TH3, TH4)and the low side transistors (TL1, TL2, TL3, TL4)are connected each other and to a first terminal 156, 166, 176, 186 of the corresponding impedance 153,163,173,183 , wherein second terminals 190 of the impedances are connected to each other. The apparatus also comprises a staggered signal transistor driver 130 to assert separate delayed high side signals to control inputs of the high side transistors(TH1,TH2, TH3, TH4). The delayed high side signals are time delayed with respect to each other. The driver asserts separate delayed low side signals (TL1, TL2, TL3, TL4)to control inputs of the low side transistors.

Description

Background technique [0001] Motors are used in a variety of applications. For high power systems, a motor driver and three-phase alternating current (AC) power can be used to drive the motor. Motor drivers may include switches (eg, transistors) that are turned on and off to generate the desired voltage and current to drive the motor. In some cases, fast switching times may cause voltage and current overshoots and / or undershoots transmitted through the power cables from the motor drive to the motor. This overshoot or undershoot in motor voltage or current can cause a partial breakdown of the electrical isolation within the motor, which can lead to premature failure. [0002] In industrial settings, the electric motor can be located at a large distance from the motor drive. The longer the cable, the higher the possibility that high-frequency noise generated by the switch may cause cable reflections. In order to avoid overshoot / undershoot from these cable reflections, the mea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P23/28
CPCH02P23/28H03K17/164H02P27/08H03K19/018585H03K17/284H02P6/14H03K2217/0072H03K2217/0063
Inventor J·T·斯特赖敦
Owner TEXAS INSTR INC
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