JPS58222619A - Switching circuit - Google Patents

Abstract

PURPOSE:To improve the switching speed, by using a diode in place of an inductance for blocking AC signal of a bias circuit of a switching diode. CONSTITUTION:The bias circuit for the switching diodes 3, 16 supply a bias current to the switching diodes by diodes 25, 26, inductances 12, 17, 11 and a resistor 10. Thus, a signal passes through an output terminal 5 from either of input terminals 1 and 19. Since an AC signal is biased and canceled with the cutoff characteristic of the diodes and a capacitor 23, crosstalk of signals between the terminals 1 and 19 is prevented.

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention It relates to a switching circuit using switching diodes and diodes used for switching between a working system and a standby system, and in particular, a switching circuit that speeds up the switching time of a switching diode. (b) Technical Background In general, unreliable communication systems and electronic devices have a backup system in addition to the current system, and in the event of a failure in the current system, the communication system can be quickly switched to the backup system. Figure 1 shows a conventional switching Ig1wr using a switching diode, where l and 9 are input terminals -L 4e 20# 2 L 23' is a capacitor, and L'14 is a capacitor. Lott input terminal (hereinafter referred to as input terminal), 9 is ground, 10.22.22' is resistor, l
ip 12- 13- 17e 1B is an inductance ◎ FIG. 2 is an equivalent circuit of the main part of FIG. 1. -, 24 is the area gap. Figure 3 is a diagram showing the rise time of the switching circuit. ◎3.
16 is a diode, 5 is an output terminal, 6 is a diode control circuit, 7.15 is a bias military ship terminal (hereinafter referred to as 熾子)
0 In FIG. 1, the signal of the current device is input from input terminal 1, and capacitor 2. Switching diode 3. Content? The switching diode 3 is turned on when a negative voltage is output to the terminal 7 of the diode switching control circuit (hereinafter also referred to as control circuit) 6, that is, the input of the control circuit 6. This is when the positive path biostate signal of the current system is input to terminal 8. If a negative voltage is applied to the output layer of terminal 7, the switch will flow and the bias current i will be reduced by the high frequency blocking inductance 12.13
flows into terminal 7 via ・A fault in the current device is detected,
When the detection signal is input to the control circuit 60, a negative voltage is output to the output layer 15 of the control circuit 6, and the output of the negative voltage from the output terminal 7 is stopped.

This causes resistance 10 to be lower than ground 9. A bias current directly flows through the high-frequency blocking inductance 11 to the switching diode 16 at an armpit bias current of 5 to conduct the switching diode 16. The bias current 1 flows into the terminal 15I/c via the high-frequency blocking inductance 17.18. As a result, the output signal of the standby device is input to the input terminal 19,
Capacitor 20. Diode 16. The signal is output from the output terminal 5 of the system via the capacitor 4, and switches the faulty active device to the backup device.

In the above circuit the inductances 12, 13 and 17
．． 18 is used by dividing it into two pieces, but originally each piece is used as one piece, but if it is made into one piece, the stray capacitance of the winding increases in the inductance, and the inductance for AC signals increases. In order to prevent the characteristics from being shown, they are each divided into two parts. In the figure, 422 and 22' are bias resistors of diodes 3°16, and 23 and 23' are capacitors for erasing AC signal components. Inductance 12.13 and 1L1
B is used to block the alternating current (Fig. -The switching time is mainly determined by resistance and inductance, and the main part that displays the switching time is 1If.
The li circuit can be represented by an 11n2 diagram.

In Figure 2, IIT1t24 has a foot voltage step ■・
When 1 is applied, 11 flows through the circuit, so l・=y
(1,-″(R/L)t,・・・・・・・・・・・・
・・・・・・(1) ・The characteristics are shown in Figure 3 (As shown in the illusion, the switching characteristics of the switching diode cannot be made faster because the output is slow. This prevents the transmission notes from becoming distorted in the bias tgIw& or current and spare terminals
.

This is because inductance is used to improve the crosstalk characteristics between the 18 and 18.

For this purpose, a switching W-circuit with a quick switching time is desired.〇(d) Purpose of the Invention In addition to the above-mentioned points, the present invention is a novel circuit that can quickly switch to the standby side in the event of a failure of the h3A device. According to the present invention, it is an object of the present invention to provide a switching circuit that has a first diode connected to a first input terminal and a second diode connected to a twentieth input terminal.
the first diode or the twentieth diode;
A switching circuit &C that outputs a signal input from the first input terminal or the second input terminal to the output terminal by making the diode conductive under the control of the switching control circuit,
(h) Implementation of the invention by connecting the second diode and the second input inductance in series between the contact point between the tenth diode and the first input terminal and the switching control circuit. EXAMPLE The present invention will be explained below based on the embodiment shown in FIG. The figure shows the same function by inserting diodes 25 and 26 in place of the signal blocking inductance 13 and 18 in figure m1.

Bias circuit for switching diode 3 of current equipment;
From ground 9 to resistor 10 - inductance 11 - ground 1 - inductance 1 - inductance 12 - diode 25
Controlled 41 times after ! Bias 1 to terminal 6 [in this case negative tortoise pressure is output] 7! Flowing flow 0.

As a result, switching diode 3 is connected to the barrel.

The signal from the input terminal 1 passes through the switching diode 3 and the capacitor 4, and is output from the output terminal 5. ・Bias circuit for the switching diode 16 of the backup device; ground 9 - resistance 1 o - inductance 11 - switching diode 16 - A bias m current is flagged at the inductance 17, the diode 26, and the terminal 15 of the control circuit 6 (negative voltage is output in the case of a negative voltage).As a result, the input terminal 0484 is input from the input terminal 19, and the capacitor 20° Switching diode 16. Condenser 1t4
is output from the mechanical output terminal 5.
In the case of -, the diode 2L26 is used instead of the inductance 13.18, and the frequency 1H that passes through the diode 25 or 26 is bypassed by the cut second characteristic of the diode 251L or 26 and the capacitor 23. Since cut 1 is removed and 9 is removed, it is possible to prevent leprosy 1゜19 C) from inertia. If you show it, it will be like hanging 5 evils and age 5 causes.

1(c)&apply・1*==IF (1-1-tc)...scream...
...Scream...(2). Here, the lifespan of the T Buddha small ridge carrier is 116 hours, and ll indicates 11lt electric current.The rise characteristics of formula #21 are as shown in (1) in Figure 3.Compared to (1) 2 above. It shows a courier's rise.

Note that 13 in equation (1) and 1 in equation (2). Let be i, , , i at infinite time, i.e., 1 and 0, i.e.

In a switching circuit using a conventional switching diode,
Inductance 13 and 1 to improve the fi talking time.
8, the characteristics shown in the K113 equation required one self-time to reach the match characteristic current of the diode. However, in the characteristics shown in equation (2) of the vJv circuit using the switching diode of the present invention, That is 1. It's time. 1. >1. No interpolation @ As a result, the speed of switching from the active device to the standby device can be increased0 (1!J As described in detail, in the present invention, the high frequency signal bias circuit By using a diode instead of an inductor to prevent the flow into the inductor, it is possible to speed up the switching time of the switching diode.

[Brief explanation of drawings]

Fig. 1 is a switching circuit using a conventional switching diode, Fig. 2 is an equivalent circuit of the main part of the first prisoner, and Fig. 3 is a diagram showing the rise time of the switching circuit. FIG. 4 shows the practicality of the present invention, and FIG. 5 shows an equivalent circuit of the main part of FIG. 4.

Claims (1)

[Claims] a first diode connected to the first input terminal and a second diode connected to the first input terminal;
a second diode connected to the input terminal of the 8
In the switching circuit that outputs a signal input from the first input terminal or the second input terminal to the output terminal by making the first diode or the second diode conductive under the control of the switching control circuit, A resistor and a third resistor are provided between the contact between the first diode and the first input terminal and the switching control circuit, and between the contact between the second diode and the second input terminal and the cough switching control circuit. A switching circuit characterized by a single-row circuit consisting of diodes and an interface connected in series◎