SU419879A1 - DEVICE FOR HACTOTHO-HAinyjlbCHOrO REGULATION OF CONSTANT VOLTAGE - Google Patents

Description

one

The invention is intended to impulsely control DC voltage at various loads, e.g., DC motors.

Devices for frequency-voltage DC voltage control are known, comprising a power thyristor connected between a DC voltage source and an output, commuting LC circuit and control / C circuit, the connection point of the resistor and capacitor through which a switching device, such as a distor It is connected to a control electrode of a s.lovy thyristor.

To simplify and increase the reliability of the proposed device, the switching and control / C-circuits are connected in parallel to the thyristor power electrodes. The control resistor / C-converter is variable.

In the drawing, the circuit diagram of the device described is given.

The device consists of a source And direct current, a power thyristor G, an oscillating LoCo-circuit, which sets the frequency of the C-circuit and a switching diode (dynistor) D. Resistor R is made variable. Regulator P controls the magnitude of the resistor R and thereby the frequency of the current pulses. The device is loaded on the load Z, i.

The mean value of the current / o at constant values of LO, Co and C depends only on the resistance value of the variable resistor R, T.e.r, i (R).

Thus, the resistor R sets the pulse frequency

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As a resistor R, resistors can be used in various designs depending on the purpose of the device. For example, in automatic electric control systems, semiconductor elements, such as thermistors, transistors, photoresistors, and others, whose resistances are regulated (by current or luminous flux) but their input, are used as the resistor R.

In the initial state, the device is adjusted so that over the entire range of constant time / C-chain control is longer than the constant charge time of the capacitor Co for a pause between pulses.

The device works as follows.

After turning on the power (circuit closure) after time T RC, the voltage on capacitor C reaches the response threshold for dynistor D and thyristor T. and for the next V4 period, it is recharged (due to the energy accumulated in the LO inductance during the discharge time) and quenches the thyristor T, since the current is recharged and set against the current of the thyristor.

The duration of the current pulse is equal to the half-period of the natural oscillations of the LoCo circuit G / 2. After the thyristor T is turned off, the capacitors C and Co begin to charge again. On the capacitor of the C-chain, over time, the voltage reaches the voltage to open the thyristor and the cycle repeats.

Applied to specific Zji loads in order to improve their dynamic characteristics, the proposed device may contain auxiliary elements (chokes, diodes, etc.).

Subject invention

A device for frequency-pulse control of a DC voltage, containing a power thyristor connected between a constant voltage source and an output, switching LC-KO.HTyp and control C-circuit, the connection point of the resistor and capacitor through a switching device, for example A dynistor connected to a control electrode of a power thyristor, characterized in that, in order to simplify and increase reliability, the switching and control RC circuit is connected in parallel to the power electrodes of the thyristor, and Aulus guide have a C-chain is made variable.