Page 8
Key
1. Variable dc power supply, 0–1A output.
Output impedance less than 0.2Ω
2. Capacitor 220µF, 400V (required if power supply output impedance is greater than
0.2Ω)
3. Low impedance milliammeter, to indicate 20mA dc
4. Voltmeter (10,000Ω/V or better)
5. Variable resistance, 0–5Ω in 0.1Ω increments
6. Battery
7. Bulb or buzzer to suit (6)
8. 1kΩ precision resistor
9. 0–1V voltmeter
10. Variable resistor 0–100kΩ (increments of 100Ω)
Application note
Battery charger systems with an inductive output element only, should have a suitable load
connected, such as a battery, during commissioning and normal operation.
This is to avoid resonance of the output inductor with the system capacitance which may
produce damaging high peak output voltages.
For use with inductor only filtered chargers, a small standing drain will be required on the
battery busbars so that a high resistance alarm is given for a completely open circuit battery,
eg. typical drain of 0.3A for a 110V system.
3
4
9
8
10
5
A
7
2
1
E(GND)
6
Figure 2: Connection diagram for Battery Alarm test sequence
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