December 5, 2023

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?

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
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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