UM0527 datasheet(28/66 Pages) STMICROELECTRONICS

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General description

UM0527

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synchronized with the mains, the ACF! signal is set to low and the inverter is

switched off.

–

Mains mode - in this mode the battery charger is switched on and the UPS is

supplied from the mains. The inverter is switched off (INV_A and INV_B are in low

state), and ACF! is high.

–

Buck mode - in this mode the battery charger is switched on and the UPS is

supplied from the mains. The ACH signal is switched on, the inverter is switched

off, ACF! is high and the ACL signal is in low state.

–

Boost mode - in this mode the battery charger is switched on and the UPS is

supplied from the mains. The ACL signal is switched on, the inverter is switched

off, ACF! is high and the ACH signal is in low state.

–

Standby mode - in this mode the battery charger is switched off and the UPS is

supplied from the battery. ACH and ACL are in low state, ACF! is low, CHOFF is

high, and the inverter is switched off.

–

Standby charge mode - the UPS is in this state when the mains is lower than the

low level boost mode. ACH and ACL are in low state, ACF! is high, CHOFF is low,

and the inverter is switched off.

–

OFF mode - the UPS in this mode is totally switched off. This state is availably only

in battery mode after pressing the on/off key longer than 4 seconds.

Additionally the UPS tests the battery. The battery test is done by switching to the inverter

mode. During the test the MCU measures UPS output load and battery voltage. If the

battery voltage during the test falls below the limit, the battery is failing. The value of the limit

depends on time and load current. The test can be forced by the user with a PC. The battery

condition can by checked after switching to the inverter mode without forcing the test. A load

is necessary to test the battery.

Table 11.

Signal state in different modes

Work mode

INV_A

INV_B

ACH

ACL

ACF!

CHOFF

SHD

Inverter mode

50 Hz (60 for US

version) PWM

signal (less than

40% duty cycle)

50 Hz (60 for US

version) PWM

signal (less than

40% duty cycle)

Signal is switched to

L after rising edge

INV_A or INV_B and

switched to H before

falling edge INV_A

or INV_B.

Mains mode

Depends on

battery

voltage

Buck mode

Boost mode

Standby mode

Standby charge

mode

Depends on

battery

voltage

Off mode

UM0527 Datasheet(PDF) 28 Page - STMicroelectronics

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