Read Panasonic KX-NS500 / KX-NS520 Service Manual Supplement online
8
2.5.
Battery voltage input and output
Changed from Original Service Manual as section 4.9.
This section describes the operation of battery input and output.
This section describes the operation of battery input and output.
1) Battery voltage output (charge time)
Charge circuit has constant voltage and constant current.
When the battery voltage is high, a controlled fixed voltage of the main converter is output.
When the battery voltage is low, a controlled fixed current of main converter is output.
When DC switch is turned on and CN102 (3)-(4) is short circuited, the main converter output supplies voltage with controlled
circuit, and Q7, Q11, Z4 change to ON. Q1, Q2 of DC switch circuit is turned on and battery output.
When the battery voltage is low, battery output is limited to a fixed current controlled by R1, R2, R3, and Q4.
When voltage is even lower.
When the battery voltage is high, a controlled fixed voltage of the main converter is output.
When the battery voltage is low, a controlled fixed current of main converter is output.
When DC switch is turned on and CN102 (3)-(4) is short circuited, the main converter output supplies voltage with controlled
circuit, and Q7, Q11, Z4 change to ON. Q1, Q2 of DC switch circuit is turned on and battery output.
When the battery voltage is low, battery output is limited to a fixed current controlled by R1, R2, R3, and Q4.
When voltage is even lower.
2) Battery voltage input (power outage)
When AC input falls, is shifts to the backup supply from the battery. Battery voltage conducts to FET Q2 and diode D1, and is
supplied by main converter output (C10, C11, C36).
When the battery voltage is reduced, Q7, Q11, Z4 on the battery control circuit go OFF. Q2 of the battery input/output DC switch
circuit goes to OFF status and releases the battery which stops the power supply.
supplied by main converter output (C10, C11, C36).
When the battery voltage is reduced, Q7, Q11, Z4 on the battery control circuit go OFF. Q2 of the battery input/output DC switch
circuit goes to OFF status and releases the battery which stops the power supply.
Battery Voltage
Input / Output Terminal
Input / Output Terminal
GND
(A) Battery Input / Output
DC Switch Circuit
(D1,Q1,Q2,Q4)
F2
CN102
3
4
(B) Battery Operation
Control Circuit
(Q7,Q11,Z4,R1,R2,R3)
Control Circuit
(Q7,Q11,Z4,R1,R2,R3)
Main Converter
Output
Output
41V
,BATT
Voltage for Drive
3
4
9
Secondary
GND
GND
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