SU469227A1 - Control device of the reserved generator of clock pulses - Google Patents

Description

one

The invention can be used to control redundant clock generators in cordless type switches, in quasi-electronic and electronic PBXs.

The known devices for monitoring a redundant clock pulse generator have a number of significant drawbacks, namely, they cannot detect the loss of a single pulse, the appearance of a false pulse, a change in the phase of the pulses, a single change in the pulse duration, that is, they cannot detect out of sync at a single moment in time.

The purpose of the invention is to expand the functionality of the device.

For this purpose, the primary winding of the pulse transformer, the secondary winding of which is connected to the rectifier input, is connected to the collector circuits of the output stages of the redundant clock generator.

FIG. 1 shows a diagram of the proposed device; in fig. Figure 2 shows timing diagrams for the formation of accidents. The output stages of the redundant clock pulse generator (RGTI) are assembled on transistors 1 and 2, the collectors of which include resistors 3 and 4.

The control device (CC) contains: a pulse transformer 5, the primary winding of which is connected to a collector circuit through separation capacitors 6 and 7

transistors 1 and 2, and the secondary winding of the pulse transformer 5 is loaded with a full-wave rectifier 8, and a trigger input with an actuator 9 is connected to the output of rectifier 8.

The device works as follows.

The resistors 3 and 4 of the output stages 10 and 11 of the redundant clock generator remove two identical sequences of clock pulses Ll and U of positive polarity, which through capacitors 6 and 7 are fed to the primary winding of the pulse transformer 5. When cascades 10 and 11 are in good condition and work synchronously then there is no current in the primary winding of the transformer 5. When out-of-sync or failure occurs, for example, at time i, a spurious pulse occurs at the output of the cascade 10, in this case transistor 1 is locked and transistor 2 in cascade 11

is open. According to the circuit: resistor 3, capacitor 6, the primary winding of the transformer 5, capacitor 7, collector - emitter of transistor 2 from the power source EK current flows. In the secondary winding of the transformer about induced emf. - impulse From, through rectifier

this pulse is converted into an f / s pulse and is fed to the trigger input with the actuator 9. The trigger overturns and turns on the actuator, for example, a relay, a light bulb, a bell, etc. If, at time / 2, there is no output pulse at the output of the cascade 10 Hi, for example, during a short circuit of the transitions, the emitter emitter of transistor 1, and cascade 11 is working normally, i.e., there is a pulse Uz at its output, transistor 2 is locked. Then the circuit: a resistor 4, a capacitor 7, the primary winding of the transformer 5, a capacitor 6, a collector-emitter of transistor 1, a current flows from the EC power source. In the secondary winding of transformer 5, an impulse f / 4 arises, which is converted by the rectifier into impulse U. From the impulse f / s of positive polarity

trigger fires

with executive VCT device 9.

Subject invention

A control device for a redundant clock generator, containing output stage circuits of a redundant clock generator, a rectifier connected to the actuator trigger, characterized in that, in order to expand the functionality of the device, to the collector circuits of the output cascades of the redundant clock generator through separation capacitors the primary winding of the pulse transformer is connected, the secondary winding of which is connected to the rectifier input .