Charger based on PR1500i power regulator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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This car battery charger is designed to create a workable device with minimal material and labor costs. The impetus for the implementation of the idea was the appearance on sale of the PR1500i phase power controller [1, 2], and the charger by N. Talanov and V. Fomin [3] was taken as a prototype.
A big plus of the proposed device, along with its simplicity, turned out to be non-critical to the choice of a network transformer - its secondary winding can have a voltage of 12 to 25 V.
Of course, it must withstand the required current load. Even at the design stage, it was assumed that the PR1500 power regulator triac opens at the same angles when the mains voltage polarity is reversed, which minimizes the DC component on the primary winding of the transformer. The subsequent operation of five copies of the charger with different transformers in different temperature conditions proved the correctness and reliability of this solution.
The PR1500i modification regulator, which has a galvanically isolated heat sink flange, is used to provide a more convenient layout. The pinout of this regulator is indicated in [2]. The whole device is housed in a case from a disused computer power supply, which had left power connectors and a switch.
The charger circuit is shown in fig. one.
The PR1500 power controller switch option follows the factory design guidelines for devices with inductive loads. This is important - in the absence of the C1R2 circuit, the charger does not work
In the manufacture of the device, I used volumetric installation. The rectifier bridge VD1 is screwed to the body of the device, and the regulator DA1 is fixed on a heat sink attached to the transformer with a metal square. Resistor R1 must be isolated from the housing and provided with a plastic handle, since it is under mains voltage. Bridge VD1 must be rated for a load current of 10 A or more. In installation, the most convenient bridge with an insulated body and a hole for mounting. A view of the installation of the device is shown in fig. 2.
Ammeter RA1 - any, direct current, with a scale of 8 ... 25 A. In the described charger, an ammeter was installed, made from a Chinese multimeter YX-1000A [4]. Fuse FU2 is designed to protect the VD1 diode bridge from incorrect connection of the battery in reverse polarity and accidental short circuits of the output circuit.
The appearance of one of the variants of the charger is shown in fig. 3.
A complete charger is usually equipped with a voltmeter. The PV1 voltmeter will fit any small-sized one with a scale of 15 V.
The device does not require adjustment and starts working immediately. It should be remembered that the charger should be connected to the network only after the variable resistor R1 is set to the position corresponding to the minimum charging current.
The advantages of the described device include its simplicity and availability for manufacturing even by inexperienced radio amateurs, galvanic isolation of the load from the network, no need for adjustment, undemanding to the choice of transformer. Cons - the lack of stabilization of the charging current, which is why it has to be adjusted during the charging process, and the increased noise of the transformer.
Literature
1. Phase power regulators. - thyristor.ru/hibr.html
2. Dolgy A. Power regulators PR 1500, PR1500i, PR1500g, PRP-500. - Radio, 2004, No. 11, p. 47, 48.
3. Talanov N., Fomin V. Charger for starter batteries. - Radio, 1994, N9 7, p. 28, 29.
4. Measuring head from a Chinese multimeter. - muralev.narod.ru/archiv/r12/YX-1000A.htm
Author: S. Muralev, Dimitrovgrad, Ulyanovsk Region
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