SU799077A1 - Device for charging storage battery from dc source - Google Patents

Description

(54) DEVICE FOR CHARGING THE BATTERY BATTERY FROM THE SOURCE OF CURRENT CURRENT

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The invention relates to direct current converters and can be used in particular to charge a battery.

A device containing a choke, a power transistor, a diode and a control circuit p.

However, this device has low reliability due to the occurrence of high voltages in the power circuit of the device when the charging circuit is broken.

It is also known a device comprising a choke, a semiconductor switch, a diode and a control circuit with a 2j current sensor.

However, this device also has low reliability in case of an open circuit.

Closest to the proposed technical entity is a device containing a choke, a diode, a semiconductor switch with an automatic control unit connected to the sensor in the power circuit.

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The drawback of the device is low. Reliability due to the occurrence of overvoltages in the power circuit of the device when the charging circuit is broken.

The purpose of the invention is to increase the reliability of the device.

The goal is achieved by the fact that in a device containing a choke, a diode and a power transistor with an automatic control unit connected to the current sensor, a capacitor is connected to the device output, and the thyristor is connected parallel to the output of the automatic control unit; device output.

In addition, a signal element, such as a lamp, is included in the anode circuit of the thyristor.

The drawing shows a circuit diagram of the proposed device.

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Claims (3)

The device contains a choke 1, a diode 2; power transistor 3, automatic control unit 4 connected to the current sensor 5, capacitor 6 connected to the output of the device i thyristor 7 connected in parallel with the output of the automatic control unit 4 through the diode 8, and the control circuit of which through the threshold Element 9 is connected to the output of the device roystva; a signal device, for example, a signal lamp 10 connected to the anode circuit of the thyristor 7. The device is powered from a DC source and its battery is charged by the battery 11. The device works as follows. When the power source is turned on, unit 4 switches the power transistor to the open state, and in the circuit containing the current sensor 5, the choke 1 and the power transistor 3, an exponentially increasing current occurs. When the current reaches a certain value specified by setting 3, the signal from the current sensor 5 causes the block 4 to turn the power transistor into the closed state. After locking the power transistor, the energy stored in the choke 1 during the current rise time is spent on the charge of the battery 11, which causes an exponentially decreasing current in the circuit containing the current sensor choke 1, diode 2 and battery 11. When the current is reached of a certain, given by the set value Zg, according to the signal from the sensor, current 5, block 4 sets the power transistor 3 to the open state, after which the processes are repeated. In the event of an open circuit, the energy stored in choke 1 is transferred to the capacitor 6 by current flowing through the circuit containing choke 1, diode 2, capacitor 6, power supply and current sensors 5. At the same time, the capacitor 6 is charged and, determined from the equality (where L is the inductance of the choke C - capacitor capacitance) E is the current of the choke U (, is the capacitor voltage before the battery charge circuit is broken. The rising voltage on the charge of capacitor b, reaching the threshold of element 9, causes it to unlock, after which the thyristor 7 is unlocked. Unlocked, the thyristor 7 short-circuits the output of the unit automatic control, which eliminates the new unlocking of the power transistor 3, and therefore prevents a new accumulation of energy in the inductor 1 and a further voltage drop on the capacitor 6. When unlocking the thyristor 7, the signal The element, for example, the signal lamp 10 lights up, indicating a break in the charge circuit. The capacitor b should be chosen such that the magnitude of the voltage across it in case of a break in the charge circuit does not exceed the allowable value for the transistor. Namely, a capacitor connected to the output of the device and a thyristor connected in parallel with the output of the automatic regulation unit and the control circuit of which through the threshold element is connected to the output of the device allows In comparison with the known increase the reliability of the device. Claim 1. A device for charging a battery from a direct current source, containing a choke and a diode connected in series between the input and output terminals, a power transistor, the base circuit of which is connected to the output of the automatic control unit connected to the current sensor, and, in order to increase reliability, a capacitor is connected to the output of the device, and a thyristor is connected parallel to the output of the automatic control unit, the control circuit of which through a threshold ement is connected to the output terminals of the device. 2. Device POP.1, characterized by the fact that, in order to signal the breaking of the charging circuit, a signal element, such as a lamp, is included in the anode circuit of the thyristor. Sources of information taken into account in the examination 1.Patent of France No. 2140566, cl. H 02 3 7/00, 1973. 2. The patent of Germany No. 2602789, cl. H 02 3 7/10, 1978. 3. The patent of France 208697, cl. H 02 3 7/00, 1972.