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IRS26310DJPbF
Figure 14: Programming over-temperature protection
Figure 15: Using over-current protection and over-
temperature protection
DC bus Over-Voltage Protection
When driving permanent magnet ac motors there is a potential to regenerate some of the motor mechanical
energy back onto the dc bus. “Zero vector braking” prevents charging of the dc bus capacitor by shorting all three
motor terminals to a common rail to dissipate this mechanical energy in the motor windings. The dc bus over-
voltage protection feature on the IC initiates zero vector braking when the dc bus voltage goes above some
critical voltage level to prevent damage to dc bus components. Zero vector braking should only be used when the
motor winding inductance is sufficient to limit the motor short circuit current to a safe level. Dc bus protection
operates even when all PWM inputs are disabled so will protect the motor when operating in high speed field
weakening mode.
The IRS26310D ICs have a DCbusSense input pin to detect over-voltage events on the DC bus. Once the IC
detects an over-voltage event, zero vector mode braking is forced (all Low side output turn-on, all High side
output-turn-off) overriding the PWM signals coming from the controller. A fault is not reported on the FAULT pin
for this condition because the power inverter is still active. DC bus over-voltage protection is not latched and so
the zero vector mode is released when DCbusSense pin is lower than O VDCBUSVTH- .
The level of voltage at which the over-voltage protection is initiated is determined by the resistor divider (i.e., R 0 and
R 1 ) connected to DCbusSense as shown in Figure 16, and the DCbusSense threshold (O VDCBUSVTH+ ). The circuit
designer will need to determine the maximum allowable level of DC bus voltage and select R 0 and R 1 such that the
voltage at node V X reaches the over-voltage threshold (O VDCBUSVTH+ ).
O VDCBUSVTH+ = R 1 V DCBUS /(R 0 +R 1 )
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