SU221037A1 - STRAINED VOLTAGE GENERATOR - Google Patents

Description

Stage voltage generators are known that contain a storage capacitor charged through a device with an S-shaped current-voltage characteristic.

The difference of the described generator is that the device with the S-shaped volt-ampere characteristic is made in the form of a blocking generator on the transistor. The generator is connected between the metering and storage capacitors as a two-port network.

In the blocking generator, a silicon Zener diode is connected between the end of the collector winding of the transformer and the base of the transistor, and a dynamic bias circuit comprising a capacitor and a diode connected in parallel is connected between the emitter of the transistor and the end of the base winding of the transformer.

These differences increase the stability of the output voltage.

The drawing shows a schematic diagram of a step voltage generator.

The generator works as follows.

When, as the capacitor charges, the voltage across it reaches a value sufficient for the breakdown of Zener diode 2, the latter breaks through and the current flowing through it opens the transistor 3. Due to the positive feedback in the circuit

a blocking process is developing that leads to the avalanche-like unlocking of the transistor. Through an unlocked transistor, the capacitor / is discharged to the capacitor 4, forming the last step voltage. As the capacitor / voltage is discharged at points 5, 6, it drops and reaches a small value close to the saturation voltage of the transistor. In this case, the gain of the transistor drops, and an avalanche-like process of turning off the transistor develops. Thus, in this scheme, the transistor behaves formally analogously to a device with an S-shaped volt-ampere characteristic. Different patterns can be used as the bit switch 7, depending on the specific purpose of the generator. In particular, devices with an S-shaped current-voltage characteristic can be used.

The described device has the following advantages.

The circuit uses conventional transistors and semiconductor diodes, the cost of which is lower than the cost of special

devices with S-shaped current-voltage characteristic.

Both thresholds, on which stability depends, are very stable. The breakdown voltage of silicon zener diodes is comparative, and the saturation voltage is very small and has good temperature stability.

Due to this, the circuit allows to obtain a stable step voltage with equal amplitude of the steps.

Subject invention

Claims (2)

1. A step voltage generator comprising a storage capacitor connected through an S-shaped current-voltage characteristic with a metering capacitor connected to a power source, characterized in that, in order to increase the output voltage stability, said device with S- shaped current-voltage characteristic is made in the form of a blocking generator on the transistor, connected between the metering and storage capacitors as a two-port network. 2. A device according to claim 1, in whose blocking generator a silicon Zener diode is connected between the end of the collector winding of the transformer and the base of the transistor, and a dynamic bias circuit containing a parallel-connected capacitor and a diode is connected between the emitter of the transistor and the end of the transformer's base winding.