SLOA338 March 2025 TSD5402-Q1
5.8 Fail Events
Figure 5-21 shows the test setup and Figure 5-22 schematic for fail events. The test setup introduces short to ground or short to VCC test conditions through a fault injector. The fault injector uses a mercury-wetted relay that provides excellent, bounce-less, switching characteristics. The waveforms demonstrate that the excitation amplifier promptly reacts to the short circuit condition by disabling the output. This prevents the power supply overload and protects the system. The excitation amplifier recovers to the normal operation after the short circuit removal.
Figure 5-21 Test Setup for Fail Events
Figure 5-22 Circuit for the Test Setup for Fail EventsFigure 5-23 shows resolver waveforms for reference.
Figure 5-23 Fail Events - Reference WaveformsCH1 – EXC+ signal (single-ended)
CH2 – EXC- signal (single-ended)
CH3 – Excitation amplifier input current
CH4 – Resolver current
Figure 5-24 Short to Ground
Figure 5-25 Short to Ground (detail)
Figure 5-26 Recovery from Short to
Ground
Figure 5-27 Short to VCC
Figure 5-28 Short to VCC (Detail)
Figure 5-29 Recovery from Short to
VCC