SU375652A1 - Voltage divider - Google Patents

Description

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This invention relates to the field of computing.

A known precision voltage divider containing reversible inverters.

In the circuit of such a voltage divider, there are storage capacitors that take some time to charge and discharge them. This results in an insufficiently high speed in the case of dividing input voltages containing high-frequency wanted signals.

The proposed voltage divider contains an isolation transformer with two output windings, one of which is connected to the emitters of the key transistors of one, and the other to the emitters of the key transistors of the other reversible inverter.

This makes it possible to increase the speed of the voltage divider.

The drawing shows a divider circuit.

The voltage divider contains a first precision reversible inverter / voltage, including key transistors 2, 3, 4, and 5, controlled from the secondary windings of transformer 6 (the primary winding of the transformer is not shown a), the second precision reversible inverter 7 voltage, including key transistors 8, 9, 10, and 11, controlled from the secondary windings of the transformer 6, are additional resistors 12 that serve to limit the base currents of the key transistors. In addition, a pair of these resistors connected to one winding of the transformer forms an artificial average

point that saves the number of secondary windings of the transformer 6.

Capacitors 13 and 14 have a small amount of capacitance and do not play a fundamental role. Their role is to reduce the "bursts of the transient process that occurs when switching -key transistors. The key transistors of precision inverters in this case are connected in a bridge circuit. To one diagonal of the bridge, which is

the output of the alternating current of the first precision reversible inverter is connected to one of the windings of the precision transformer 15 (terminals a, b). In the same way, a second winding (clamps c, d) of the same precision transformer 15 is connected to the AC output of the second precision reversible inverter.

Thus, the outputs (inputs) of the alternating current of both precision reversible

Inverters are connected to each other through a precision transformer 15.

The inputs (outputs) of the direct current of both reversible precision inverters (capacitor terminals) are connected in series and to the terminals e, e, which are the terminals of the input of the precision divider. The input voltage t / in is to be divided to these terminals. The precision splitter output is the DC input (output) of one of the precision reversible inverters (clamp g).

The secondary windings of the transformer 6 are connected to the key transistors in such a direction that during one of the half-periods of the control voltage, when the transistors 2, 5, 8, 11 are open, the transistors 3, 4, 9, 10 are closed; Conversely, during the other for the control half period, the transistors 3, 4, 9, 10 are open, and the transistors 2, 5, 8, 11 are closed.

As a result, for one of the half-periods, the windings of the precision transformer 15 are connected in the opposite direction to the other half-period of the control voltage. Due to this circumstance, a change in the emf sign is provided. on the terminals of the windings of the transformer 15, ensuring its normal operation.

The polarity of the voltage (/ output at the output of the divider remains unchanged for both half-periods of the control voltage, which ensures the division (constant component of the input voltage {Uph.

The transfer factors of the voltage divider are determined by the number of turns in the windings of the transformer 15.

With ideal controlled keys and a properly designed transformer 15, transients may have a negligible effect, and the capacitance may be small and even completely absent.

Due to the absence of slow processes of charge and discharge of these tanks, the speed of the voltage divider increases.

The accuracy of the precision splitter is influenced by the resistances of the controlled switches in the open state, the resistance of the windings of the precision transformer to direct current, the parasitic capacitances and the leakage inductance of these windings. The precision of the precision splitter is most influenced by the inductance of the scattering of the windings of the precision transformer 15. However, this effect can be compensated for by the rational constructive placement of the transformer windings.

With an equal number of turns of the windings, they must be placed on the armor cord in two identical and adjacent sections of the coil. One winding should be positioned in one section, and

other winding - completely in another section.

With an unequal number of turns of the winding can be divided into several identical sections with an equal number of turns.

Sec. And should be placed mutually symmetrically around the circumference of the toroidal core. The low resistance of controlled keys in the state of "Open and low resistance of the windings of a precision transformer to a direct current with small parasitic capacitances of these windings provide high precision of the operation of the divider of a nanometer. The divider circuit can be simplified if the windings of the transformer 15 are made with middle points. This reduces the number of controllable keys by half.

Subject invention

A voltage divider containing two series-connected reversible inverters on key transistors, characterized in that, in order to increase speed, it contains an isolation transformer with two output windings, one of which is connected to the emitters of the key transistors of one, and the other to the emitters key transistors of another reversible inverter.

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