Motorola M68HC08 manual Phase AC High Voltage Power Stage

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Hardware Design

High-Voltage Hardware Set Components

230-volt dc power supply or an ac line voltage. Either input is supplied through connector J11. Current measuring circuitry is set up for 2.93 amps full scale. Both bus and phase leg currents are measured. A cycle-by-cycle over-current trip point is set at 2.69 amps.

The high-voltage ac power stage has both a printed circuit board and a power substrate. The printed circuit board contains IGBT gate drive circuits, analog signal conditioning, low-voltage power supplies, power factor control circuitry, and some of the large, passive, power components. All of the power electronics which need to dissipate heat are mounted on the power substrate. This substrate includes the power IGBTs, brake resistors, current sensing resistors, a power factor correction MOSFET, and temperature sensing diodes. Figure 4-5shows a block diagram.

HV POWER	SWITCH MODE
INPUT		PFC CONTROL
	POWER SUPPLY	dc BUS BRAKE
		3-PHASE IGBT
SIGNALS		POWER MODULE
		3-PHASE AC
TO/FROM	GATE
		TO
CONTROL	DRIVERS
		MOTOR
BOARD		PHASE CURRENT
		PHASE VOLTAGE
		BUS CURRENT
		BUS VOLTAGE
		MONITOR
	BOARD
	ID BLOCK
		ZERO CROSS
		BACK-EMF SENSE

Figure 4-5. 3-Phase AC High Voltage Power Stage

4.4.1.1 Electrical Characteristics of the 3-Phase AC/BLDC High Voltage Power Stage

The electrical characteristics in Table 4-2apply to operation at 25°C with a 160-Vdc power supply voltage.

DRM028 — Rev 0		Designer Reference Manual
MOTOROLA	Hardware Design	67

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