SU756622A1 - Pulse modulator - Google Patents

Description

The invention relates to a pulse technique and can be used mainly in the CB 4 pulse transmitters and linear particle accelerators.

According to the main author. St. No. 566342 is known for the PULSE PULSE MODULATOR.

A disadvantage of the known pulse modulator is low reliability due to possible breakdowns with repeated switching on.

The purpose of the invention is to improve reliability by eliminating the possibility of breakdowns when re-enabled.

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This goal is achieved due to the fact that an additional switching device, a diode connected between the inputs of the main and additional 20 switching devices and a capacitor connected between a common bus and a point, are connected to the pulse modulator, the cathode of the diode is connected to the input of an additional switching device whose output is included in 25 submodulator power supply circuit.

The drawing shows a diagram of a pulse modulator.

Pulse modulator contains a series-connected source 1 30

power supply, charger 2 and energy storage 3, to the input of which the switching element 4 is connected, and to the output - a magnetron 5. The output of the submodulator 6 is connected to the control input of the switching element 4, and the sensor 7 of the anode current of the magnetron is connected between the switching element and the common bus . The first input of the comparator 8 is connected to the connection point of the switching element with the anode current sensor of the magnetron, the second input of which is connected to the source 9 of the reference voltage, and the output is connected to the regulating element 10. The rectifier 11 is connected to the common bus by a negative pole, and a capacitor is connected in parallel with the rectifier

12. A resistor 13 is connected between the first input of the comparator and the second output of the capacitor, and the main switching device 14 is connected between the point where the capacitor connects to the resistor and the positive pole of the rectifier.

The control input of the additional switching device 15 is bridged by a capacitor 16 connected through a diode 17 to the control input of the main switching device 3

756622

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and output connected to the power supply

submodulator.

Pulse modulator works as follows.

In the intervals between pulses through * the charger 2, the energy storage device 3 charges, while the discharge switching element 4 (for example, an electronic lamp) is locked. When applying to the control input of the discharge switching element 4 start pulses from the submodulator 6, a partial discharge of the energy storage device 3 occurs, and negative impulses are applied to the cathode of the magnetron 5. "

When the deviation of 3 d, the anode current of the magnetron from the nominal magnitude of the emulator _i0M in the comparison device 8 produces a mismatch voltage acting on the regulating element 10. At the same time, the amplitude and _{tons of} output pulses of the submodulator 6 changes in the directions opposing the change in current 3 &.

So, with the appearance of a positive increment Ed, the value of and _t decreases and the internal resistance of the switching element 4 increases; as a result, decreases until it becomes 3ρ _ΗΟν .

A smooth increase in the anode current of the magnetron 5 when turned on is as follows.

In the initial state, when the main and additional switching devices 14 and 15 are not given an on command (+ ON), power supply 1 is turned off and no power is supplied to the submodulator b) capacitor 12 is applied through closed contacts a-b and voltage is supplied from rectifier 11.

At the first input of the comparator device 8, a current 3 <> 3 <heat comes through the resistor 13 when rectifying the command (+ ON), to the main switching device 14 and through the distance 17, to the additional switching device 15 and the capacitor 16, voltage the network is fed to the input of power source 1 and to the power input of the submodulator 6}, the capacitor 12 is disconnected from the rectifier 11 (contacts AB) opens and gradually begins to discharge through the resistor 13 and the input resistance of the comparator device 8.

Due to the action of the closed current stabilization circuit 3 & (elements 3 ... 10), the total current supplied to the first input of the comparator 8 from the sensor 7 of the anode current of the magnetron and capacitor, 12, is equal to

the sum of the current values of Ed + φ ₁ , starting from the moment the modulator is turned on, is kept constant and equal to Od. As a result, there is a smooth- · increase of the current ^ 1 to the nominal value of _H0M from zero approximately exponentially. Tok3 ^ respectively decreases to zero.

After turning off the power, when the command (+ ON) is removed, the main switching device 14 provides the power source 1, the contacts AB close and the capacitor 12 starts charging through the internal resistance of the rectifier 11. The additional switching device 15, thanks to a delay element in the form of a capacitor 16, for some time it remains on, which provides during this time the power supply to the submodulator, 6. The pulses from it continue to flow to the control input of the bit switching element 4, which ensures the complete discharge of the energy storage device 3. .

As a result, by the time of the repeated command (+ ON) the current is greater than the current

and the voltage on the energy storage device 3 is close to zero.

Technical and economic effect of the application of the proposed device is that eliminates the possibility of breakdowns in the modulator and the magnetron when the power is turned on again, because after each shutdown a full discharge of the drive is achieved. This increases the reliability of the device during operation.

Claims (1)

Claim Pulse modulator auth. St. "566342, characterized by the fact that, in order to increase reliability by eliminating the possibility of breakdowns when restarting, an additional switching device, a diode ₎ connected between the inputs of the main and additional switching devices and a capacitor connected between the common bus and the connection point are introduced into it the cathode of the diode with the input of an additional switching device, the output of which is included in the power supply circuit of the submodulator.