PL155802B1 - Single-phase rectifier for charging batterier in particular those for miner's lamps - Google Patents

Description

REPUBLIC PATENT DESCRIPTION 155 802 POLAND Additional patent to patent no --- Int. Cl. ⁵ H02J 7/04 H02M 7/145 Reported: 88 02 02 / P. 270442 / Priority ---- READING ROOM GENERAL OFFICE Application announced: 89 06 07 PATENT RP Patent description published: 1992 06 30

Creators of the invention: Andrzej Ćwik, Jan Dzidowski, Marek Hefczyc, Franciszek Szczucki, Henryk

Authorized by the patent: Research and Development Center of Electrical Engineering and Automation Mining EMAG,

Katowice / Poland /

SINGLE-PHASE CHARGING CHARGER FOR BATTERIES, ESPECIALLY MINING LAMPS

The subject of the invention is a single-phase rectifier for charging accumulators, especially mining lamps, intended for simultaneous charging of a certain number of accumulators connected in parallel.

A stabilized thyristor rectifier unit for automatic charging of accumulator batteries is known from the Polish patent description No. 113 570. The unit is powered by a contactor that cuts off and enables the supply voltage to the three-way transformer. The voltage from the transformer is fed to a three-way diode-thyristor bridge, on which the rectified voltage is regulated by changing the thyristor ignition angle. Ignition pulses are supplied from the ignition system and are dependent on the control system input voltage. The control system consists of a speed signal amplifier and a voltage signal variator. The speed and voltage signals after discharging are summed up in the sumer, and then amplified in the output generator and hence sent to the ignition system.

The rectifier systems used so far for charging mining lamps do not have a system for the earth connection of the DC output terminals. For this purpose, systems that are not directly related to the rectifier system are used. Green control is performed alternately between the positive pole and ground, then between the negative pole and ground, an ammeter or other speed control device. Since during normal operation the earth speed is about 5A and its increase to 7-10A should be detected, the measurement in the current system causes high power losses, and in the case of shorting one of the poles with ground, it causes the flow of very high speeds.

The rectifier according to the invention is equipped with a pulse measurement and signaling system doziθmierιic. This circuit includes a series-connected tri.ak and a measuring resistor, including

155 802

155 802 between the transformer secondary winding and the earthed ground. The triac is connected to the pulse-timer by the control system, while the first measuring block with an optical earth fault indicator for the positive pole and the second measuring block with optical signals to the negative pole earth faults are connected to the terminals of the measuring resistor.

In the rectifier according to the invention, the earth fault control system is its integral part, which considerably simplifies the course of earth fault speed control and enables the minimization of power losses.

The subject matter of the invention is shown in an exemplary embodiment in the form of a block diagram in the drawing.

The rectifier contains a single-phase semi-static bridge with 1 diode-resistor, powered from the secondary transformer Tr. The positive pole of bridge 1 is connected via the choke L to the positive output terminal and the negative pole of bridge 1 is connected to the negative input terminal · -. Connected to the bridge 1 is the control system 2, which controls the swarms Tyl, Ty2, which are attached to you. The traak T and the measuring resistor Rp are connected in series between the winding end of the secondary transformer Tr and the ground. The 3-pulse-time circuit is connected to the T triac and controls its periodic activation. The terminals of the measuring resistor Rp are connected to: the first measuring block 4 with the optical signaling of the positive pole earth fault 5 and the second measuring block 6 with the optical signaling 7 of the negative pole earth fault.

The control system 2, which controls the thyristors Tyl, Ty2, controls the output voltage. The 3-pulse-time circuit is activated periodically every 15 seconds. traak T, for a range of about 60 ms, which causes the flow of the earth velocity in the following circuits:

- for the positive half of the secondary voltage of the transformer Tr in the area: U2 - Dl - L - Rd / + / Rp - T - U2;

- for the negative half of the secondary voltage, the trans form of the Tr circuit in the circuit: U2 - D2 - Rd / - / Rp - T.

The voltage across the measuring resistor Rp is proportional to the flowing speed dependent on the resistance dozlrm ^ nla, the positive voltage depending on the resistance of the positive pole and the negative voltage depending on the resistance of the negative pole. The positive voltage across the measuring resistor Rp is measured by the first measuring unit 4, and the negative voltage across the measuring resistor Rp is measured by the second measuring unit 6. The earth of the positive pole is signaled by the optical signaling device 5, and the earth of the negative pole is signaled by the optical signaling device 7.

Claims (1)

Ραtent disclaimer Single-phase rectifier for charging batteries, especially mining lamps, consisting of a single-phase, half-circuit diode / o-th bridge, and a power supply transformer connected to it, characterized by the fact that it is equipped with an impulse earth-fault measurement and signaling system connected in series with traak / T / and measuring resistor / Rp /, connected between the secondary of the transformer / Tr / and ground, where the traak / T / is connected with the pulse-wave control circuit / 3 /, and the terminals of the measuring resistor / Rp / are connected : first measuring block / 4 / with optical signaling device / 5 / earthing of the positive pole and second measuring block / 6 / with optical signaling / 7 / negative pole earthing.