SU400013A1 - GENERATOR OF LINEALLY CHANGING TENSION - Google Patents

Description

one

The invention relates to radio engineering and can be used in comparators, time delay devices, sweep devices and other devices.

The known linear voltage generator containing a charging transistor, to the collector value of which the forming capacitor and the base of the emitter follower transistor are connected, and the base of the charging transistor connected to the output of the composite transistor of the amplifier, has a low linearity of the output voltage at the auto-oscillator mode.

The purpose of the invention is to obtain a self-oscillating regime of a generator with a high linearity of the output voltage.

For this, in the proposed device, between the emitter follower output and the yarn source bus, the transformer primary winding and a resistor are connected successively connected, and the transformer secondary winding is connected between the bus and the amplifier input.

The drawing shows the electrical block diagram of the proposed heater.

The generator contains a charging transistor 1, to the collector of which the forming capacitor 2 and the base of transistor 3 are connected. Transistors 3 and 4 form a composite emitter follower. In the emitter circuit of the transistor 4 are connected in series the primary winding 5 of the transformer 6 and the resistor 7, the second output of which is connected to the common ptani source. The secondary winding 8 of the transformer 6 is connected between the common power supply bus and the base of the transistor 9. Transistors 9 and 10 form a composite amplifier. Resistors And, 12 and 13 provide the operating mode of the generator. The generator output is terminal 14.

The generator operates in self-oscillation mode. The linearly varying voltage is differentiated in the primary winding 5 of the transformer 6. The impulse, which is close to rectangular, on the secondary winding 8 of the transformer 6 has final polarity. In accordance with the initial pulse amplitude, the charge current of capacitor 2 is set. As the charge progresses, the current of capacitor 2 decreases. This determines the decay of the pulse width on the secondary winding 8 of the transformer 6. The decay is amplified by the transistors 9 and 10. As a result, the magnitude of the vector current of the transistor 1 increases. When the load on the capacitor 2 reaches 1, the collector voltage of the collector 10 is somewhat higher the transition of transistor 1 is opened, the condensate 2 begins to discharge through the collector junction of transistor 1 and transistor 10.

When changing the direction of the current of the capacitor 2, the voltage pulse on the secondary winding 8 of the transformer 6 changes the field, the emitter current of the transistor 9 increases, the transistor 10 is introduced into saturation. In this case, the capacitor 2 is quickly discharged. By the end of the discharge process, the discharge current decreases, and the pulse amplitude on the secondary winding 8 of the transformer 6 decreases. This leads to an increase in the collector voltage of transistor 10 and the locking of transistor 1. Then the whole process repeats.

The oscillation frequency of the generator is maintained constant due to the good linearization of the initial charge rate of the capacitor 2 and the control of the threshold value of the circuit (the value of the collector voltage of transistor 10). The dependence of the magnitude of the collector voltage of the transistor 10

from the initial and current charge rate of the capacitor 2 is explained by the DC link of the transistor 10 to the secondary winding of the transformer 6.

Subject invention

Ramp voltage generator containing a charging transistor,

to the collector circuit of which the forming capacitor and the base of the emitter follower transistor are connected, and the base of the charging transistor is connected to the output of the composite transistor amplifier, characterized in that

that, in order to obtain a self-oscillating mode with a high linearity of the output voltage, between the emitter follower output and the power supply bus are connected in series the nervous winding of the transformer and a resistor, and the secondary winding of the transformer is connected between the source bus and the amplifier input.

-.

about lit.