UM0723 datasheet(16/48 Pages) STMICROELECTRONICS

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Board description

UM0723

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Doc ID 15870 Rev 4

3.3

Circuit description

3.3.1

Power supply

The power supply in the STEVAL-IHM023V2 demonstration board is implemented as

a multifunctional block which allows to supply the inverter in all ranges of input voltage up to

285 VAC or 400 VDC. If the input AC voltage does not surpass 145 VAC, it is possible to

apply the input voltage doubler, this is done by shorting the W14 jumper. This configuration

almost doubles the input AC voltage to a standard level and allows to evaluate the motor

control application with a low level of input AC voltage.

For high-voltage applications it is necessary to set W3 jumpers to position “HIGH

VOLTAGE”, the auxiliary power supply for supplying all active components on the

demonstration board is implemented as a buck converter based on the U6 VIPer16L which

works with fixed frequency 60 kHz. The output voltage of the converter is +15 VDC voltage

which is fed into the L6390 drivers as supply voltage as well as into the linear regulator

L78L33ACD and L78M05ACDT. The linear regulator provides +3.3 VDC and +5 VDC for

supplying the operational amplifiers and other related parts placed on the demonstration

board. The selection of supply voltage for hardware peripherals placed on the board is done

with jumper W1. In the “3.3 V” position the supply voltage selected is +3.3 V and in the “5 V”

position it is +5 V. Thanks to jumper W6, it is possible to supply the connected MCU driving

board with related supply voltage. In this case, the maximal consumptive current of the MCU

unit has not overreached 50 mA. Please refer to the ST released VIPer16LD datasheet for

further information on this concept.

For low-voltage applications, the step-down converter must be disabled by setting the W3

jumper to position “<35 V ONLY”. In this case, the other linear regulator, L7815, is

connected directly on the bus line, to provide auxiliary voltage + 15 VDC.

Note:

Please note that the voltage range in this kind of application must be in the range + 18 VDC

to + 35 VDC.

For low-voltage DC motor applications which require a voltage lower than + 18 VDC, a dual

supply mode can be used. Voltage on the input connector is normally linked through power

switches to the motor and an external auxiliary voltage is fed through the J3 connector from

an external power source. The voltage of the external power supply used must be in the

range + 14.8 V to + 15.5 V with maximal consumption current 0.5 A.

The information regarding the value of the supply bus voltage on the main filtering

capacitors is sensed with the voltage divider built around R2, R4, and R7 and is fed into the

dedicated control unit through the J5 connector. The proper voltage partitioning for applied

resistors values is 0.0075.

The presence of +15 VDC on the board is indicated with green LED D7. For a better

understanding of the concept, Figure 9 describes the power supply in a block diagram.

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