SU752663A2 - Stabilized converter - Google Patents

Description

frequency player. The width modulated pulses removed from the power amplifier 8 are converted into a constant voltage by the rectifier 9 and the filter 10. The output voltage / output is fed to the feedback circuit. The input of the transistor switch 11 with a resistor load 12 is connected via a delay circuit 13 to the output of the nullorgan 14 with a voltage source, the second input of the zero-organ through a resistor 15 is connected to the output for connecting the load. The output of the key through the diode 16 is connected to the input of the zero-body. The inputs of the level comparison circuit 17 are connected to the output of the sawtooth generator and the output of the null organ, and the output to the third inputs of the selectors.

The device works as follows.

Short duration pulses (diagram a) of master oscillator 1 form a sawtooth voltage (diagram b) at the output of the saw voltage generator 2, which is compared with the voltage of 7V in the comparator 5. The output comparator pulses (diagram d) enter the selector inputs 6 for the first time , 7, to the second inputs of which rectangular emulsions are fed from output 3 (diagrams c to d). The output pulses of the selectors (diagrams l and g) operate the amplifier 8 in the push-pull mode and from its output (diagram n) through rectifier 9 (diagram) and filter 10 enters the output terminals of the converter (diagram p).

If the output converter has a stabilized constant voltage OT, whose value does not exceed the value of the reference voltage Uoa, the nullorgan 14 is closed, a high level is formed at the output (diagram e), which, through the delay circuit 13 (diagram h), opens the transistor key 11 (diagram and). The high level of the signals taken from the outputs of the level comparison circuit (diagram g) opens the selectors 6 and 7. The diode 16 is closed and the protection circuit is fixed in the initial state.

If the output voltage exceeds the permissible level determined by the on-voltage voltage, caused, for example, by a malfunction of the comparator 5 at the time ti, the output voltage of the zero-body 14 is reduced to a value at which it is compared with the level of the saw-tooth voltage. in the level comparison chart 17,

output pulses from which are fed to the third inputs of the selectors. The device switches to the next mode of operation, maintaining the output voltage equal to the value of Uou- In addition,

the front of the zero-output voltage 14 at the moment of switching from high to low starts the delay circuit 13, which closes the transistor switch AND at the time t, the voltage at its output increases to + E, which leads to the opening of diode 16. Potential the voltage at the input of the zero-body is fixed at a level determined by the voltage + and resistors 12 and 15 and selected

from the condition of keeping the null organ open. The selectors 6 and 7 are locked with a low voltage level and the converter is turned off. Next power up converter

possible only after removal of the primary diet.

The invention makes it possible to increase the reliability of the overvoltage protection of the consumer, which makes it possible to use it for powering particularly responsible consumers.

Claims (2)

1. Stabilized converter by author. St. No. 586530, characterized in that, in order to increase reliability, the input of the transistor switch is connected to the output of the null organ through the additionally introduced delay node. 2. The converter according to claim 1, characterized in that the output of the zero-organ is connected to the third inputs of the selectors through a level comparison circuit, the second input of which is connected to the output of the saw-tooth generator.