JPS581855B2 - Shiyuhatsushinki - Hojiyohatsushinkijidou Kirikaesouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for automatically switching from a main oscillator to an auxiliary oscillator in the event of a failure in a microwave oscillator, particularly an impact diode oscillator.

With the recent expansion in the scale of communication systems, there has been a strong desire for higher reliability of individual components.

However, the current situation is that individual components do not necessarily have sufficient reliability.

Particularly, impact diode oscillators used in the millimeter wave band communication field are susceptible to electrical and mechanical damage, which poses practical difficulties.

Therefore, when using such low-reliability components, if measures are taken to make maintenance easier, for example, failures can be detected immediately, and an auxiliary oscillator can be immediately switched to, etc., practical problems can be alleviated. It will be resolved.

An object of the present invention is to provide a device that automatically replaces the main oscillator with an auxiliary oscillator when the main oscillator becomes faulty open.

Next, one embodiment of the present invention will be described using the drawings.

FIG. 1 is a circuit diagram showing an embodiment according to the present invention, in which 1 and 2 are first and second lamps, 3 and 4 are first and second invat diode oscillators, and 5 and 6 are first and second lamps. and second transistors 7 and 8 are first and second reset switches, and together with six resistors in the figure form a bistable multivibrator 9 of dual power supply type.

Assume now that an impact diode drive current is applied between terminals A and B.

By pressing the first reset switch 7, the first transistor 5 is turned on and the second transistor 6 is turned off.

Then, the first lamp 1 lights up and only the first impact diode oscillator 3 starts operating.

The current flowing through the second lamp 2 is about 2 to 3 hfe of the impact diode drive current (hfe is the DC current amplification factor of the transistor used), and is so small that it can be ignored if a high hfe transistor is used.

Therefore, the second lamp 2 is not allowed to emit light.

Here, if the first impact diode oscillator 3 is applied with high voltage such as spike voltage or surge voltage or abnormally large current from the power supply circuit for some reason, or due to mechanical shock, the diode gold lead wire is deformed → short-circuited. → Burnout → If it breaks after following the opening process, the first
The transistor 5 becomes non-conductive, so that the base potential of the second transistor 6 rises and changes from non-conductive to conductive state.

Thus, the second impact diode oscillator 4 starts operating instead of the first impact diode oscillator 3.

Here, the first lamp 1 and the second lamp 2 both have a role as a resistor, which is essential for the function of the bistable multivibrator 9, and the first impad diode oscillator 3 and the second lamp Since the impact diode oscillator 4 is driven by the voltage breakdown section, it works in a constant potential manner, thereby making the function of the bistable multivibrator 9 more reliable.

When replacing the damaged first impact diode,
This will not have any adverse effect on this circuit.

After replacing the new Impatt diode oscillator, press the first reset switch 7 to transfer the transition again and return to the initial operating state, and confirm that the replaced Impatt diode oscillator is operating normally. can.

(If the replaced impact diode oscillator is in a faulty open state, the failure can be identified by the fact that it does not transfer.

) The eighth lamp 10 and the constant voltage diode 11 are connected in parallel to the AB terminal.

Now, if both the first impact diode oscillator 3 and the second impact diode oscillator 4 are in a faulty open state, the A-B terminal surface voltage will be high and constant because a constant current power supply is used. When the breakdown voltage of the voltage diode 11 is exceeded, current flows through the third lamp 10 and it emits light.

In this way, exchange instruction information can be obtained.

Figure 2 shows the first impact diode oscillator 3 and the second impact diode oscillator 3.
This is a microwave connection circuit diagram of the Impatt diode oscillator shown in FIG.

This only requires the use of one circulator 14, as is clear from the figure.

If the first impact diode oscillator 3 fails,
Alternatively, even if it is removed, most of the oscillation output of the second impact diode oscillator 4 is reflected, and the oscillation output can be obtained at the oscillation output terminal 13 through the circulator 14.

FIG. 3 is a control panel of one embodiment of FIG. 1,
The first lamp 1 and the first reset switch 7 are "normal"
The second lamp 2 and the second reset switch 8 are integrated with the mark, and the second lamp 2 and the second reset switch 8 are in a case where the first impact diode oscillator 3 is broken and the second lamp 2 is lit.
It is integrated with the "NO-1 failure" mark, and the third lamp 10
"N" lights up when both oscillators are faulty.
It is integrated with the "O-1, NO-2 failure" mark.

The second reset switch is used, for example, when periodically switching to the second impact diode oscillator 4 for inspection even when the first impact diode oscillator 3 is not out of order.

As described above, the advantages of the present invention are (1) when the main oscillator fails, it completely automatically switches to the auxiliary oscillator, (2) the main oscillator can be replaced and repaired while the auxiliary oscillator is still working.
(3) Therefore, its use as a component of practical communication systems is expected to expand.

Further, the circuit has advantages such as (1) the display lamp functions both as an alarm display and as a resistor, and (2) the oscillator effectively functions as a constant voltage diode.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, with A and B
is a constant current application terminal, 1 is the first lamp, 2 is the second lamp, 3 is the first impact diode oscillator, 4 is the second
, 5 is the first transistor, 6 is the second transistor, 7 is the first reset switch, 8 is the second reset switch, 9 is the bistable multi-bi break, 10 is the third lamp, 11 is a low voltage diode. Figure 2 shows the first impact diode oscillator 3 and the second impact diode oscillator 3.
1 is a microwave connection circuit diagram of the imput diode oscillator 4, 13 is an oscillation output terminal, and 14 is an isolator. FIG. 3 is a control panel of one embodiment of FIG. 1,
1 is a first lamp, 2 is a second lamp, 10 is a third lamp, 7 is a first reset switch, and 8 is a second reset switch.

Claims (1)

[Claims] 1 In a bistable multivibrator circuit, a light emitter and a microwave diode oscillator using voltage breakdown characteristics are connected to the collector and emitter sides of each, and a reset switch is provided for each to select the bistable state. The bistable multivibrator is operated under the first stable condition by operating the first reset switch for driving the first oscillator, and if the first oscillator becomes faulty open for some reason, this bistable multivibrator becomes the second stable multivibrator. 1. A main oscillator-auxiliary oscillator automatic switching device characterized in that the second oscillator is automatically driven depending on the condition.