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May 24, 2018

Lead-acid charge board with wide range of input voltages

Custom design and manufacture of state-of-the-art battery chargers, UPS, and power supplies for OEMs in a hurry?


DC-DC solar charge controllers
This is a microprocessor controlled SEPIC topology DC/DC converter programmed to perform as a battery charger.

Theory of Operation:
When input voltage is applied the following operations proceed.

1. The processor Initializes
2. All 3 LEDs come on for 1 second in self-test
3. The power Red LED turns on
4. The processor waits briefly until the output has a voltage greater than 1.0V (battery detect)
5. If the processor detects that a battery is connected, the processor then turns on the PWM with current set to high (about 1.7Amps)
6. The Yellow LED turns on indicating charging.
7. When the battery is charged to 13.65V the Green LED turns on to to indicate a full battery.
8. The battery continues to trickle charge (about 20mA) to balance and maintain the battery.

Can be used as a solar charge controller
Can use close to the battery to boost voltage after a long wire run, for example on POE.
Output voltage can be higher or lower than the input voltage.

Form factor and custom features can be redesigned to OEM requirements.

Quantity Price  
1-49 $80.00 add_to_cart.gif
50-99 $75.00
100-199 $63.30
200+ $61.00
PST-SEP12V-CH  
Input voltage 8-30 volts nominal, higher range possible
Output Voltage: 12 volts nominal, pulsed charge algorithm
Output Power 23 watts peak
Termination method Voltage sense, terminates to 20 mA trickle charge
Form Circuit board product, frame or case developed on request
Dimensions 4" x 1.8" x 0.5" (10 cm x 4.6 cm x 2 cm) or smaller, depending on power requirements
Weight 1.2 oz, 34 grams
   

J1      
  Faston Positive input  
J2      
  Faston Negative input  
J3       Mating connector example:
1 piece Molex 22-01-2075 housing 7 Pieces Molex 08-50-0114 crimp terminal
  Pin1 Negative out  
  Pin2 Positive out to battery  
  Pin3 N/C  
  Pin4 negative to green LED (needs a 1K resistor in series)
  Pin5 negative to yellow LED (needs a 1K resistor in series)
  Pin6 negative to red LED (needs a 1K resistor in series)
  Pin7 +5V for LED return  
J4      
  Pin1 RX  
  Pin2 TX  
J5       
  Pin1 MCLR  
  Pin2 VDD  
  Pin3 NEG  
  Pin4 DAT  
  Pin5 CLK  


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Lund Instrument Engineering, Inc. All rights reserved. by Mark W. Lund

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