SU1223352A2 - Device for eliminating contact chatter effect - Google Patents

Abstract

The invention relates to automation and computing, can be used in computer input devices, and is in addition to the main author. St. No. 782139. The purpose of the invention is the extension of functional capabilities. The device contains the first and second triggers 1 and 6, the first and second elements EXCEPT OR 2 and 5, the counter 3 and the generator 4. The input 7 of the device is connected to the information input of the first 1 trigger 1 and the first input of the first element. the output of the second trigger 6 is the output 8 of the device. The introduction of the second trigger 6 and the second element, SPARE OR 5, allowed us to form an output signal that coincides in phase. and durability with the input signal of the device. 2 Il. (/) S l / fl with 8 x N5 S 00 00 ate 1C

Description

FIG. I

The invention relates to automation and computer technology and can be used in computer input devices.

The purpose of the invention is to expand the functionality of the device by generating an output signal that coincides in phase and duration with the input signal.

Fig. 1 is a block diagram of the device for eliminating the effect of contact bounce; 2, time diagrams of operation.

The device for eliminating the contact bounce effect (FIG. 1) contains the first trigger 1, the first element EXCLUSIVE OR 2, the counter 3, the generator 4, as well as the second element EXCLUSIVE SHSh 5, and the second trigger 6,

Input 7 of the device is connected to the information input of the first trigger 1 and the first input of the first element EXCLUSIVE ШШ 2, the second input of which is connected to the inverse output “of the first trigger 1, the counting input I – T Toporo is connected to the output of the counter 3, the counting input of the counter 3 connects with the output of the generator 4, and the Setup input - with the output of the first element EXCLUSIVE I.PI 2. In addition, the first input of the second element EXCLUSIVE OR 5 is connected to the input 7 of the device, the second input is connected to the forward output of the first trigger 1, and the output of the second element and This turns the IL 5 is connected to the counting input BTOpCfro trigger 6, whose direct output is vglhodom device 8, and the data input of the second flip-flop 6 is connected to an inverted output of the first flip-flop 1,

The device for eliminating the effect of contact bounce works as follows.

In the initial state (tg-t) at the output 7 of the device (FIG. 26), at the output of the counter 3 (FIG. 2d), at the output of the second element EXCLUSIVE OR 5 (FIG. 2e), at the output 8 of the device (FIG. 2g) and at the direct output of the first trigger 1 there is a logic level O, and at the inverse output of the first trigger (fig 2d) and the output of the first element EXCLUSIVE W 2, (fig 2) there is a logic 1, At the counting input of the counter 3 come from generator 4 so1233352

These pulses (Fig. 2a), however, the counter 3 is blocked at the installation input by a logic 1 signal from the output of the first element EXCLUSIVE OVER OR 2 (Fig. 2c).

When the contact closes, the logical 1 signal (Fig.26; t, -tj) with bouncing on input 7 enters the information input of the first trigger 1 and the first inputs of the EXCLUSIVE SHSh 2 and 5 elements,

The coincidence of the signals at the inputs of the first element EXCLUSIVE IL 2 establishes on the installation input 5 of the counter 3 the resolving potential logical O (FIG. 2c; t). However, subsequent bounce pulses (fig, 2c;) set the counter 3 to the initial (zero) state. Counter 3 begins its cycle after the last pulse

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thirty

35

bounce (figv;), t, e, after the last zeroing. If a bounce pulse does not appear at the counting time of the counter 3, then the output of the counter 3 is a signal (fig. 2g; tg), the leading edge of which the first trigger 1 is set to the logical 1 state, since its information input at this moment there is a high potential (fig. 26; t), while the counter 3 is reset to the zero state by the output signal of the first element EXCLUSIVE OR 2, 4 dag 2c; tj). Further, the first trigger 1 does not change its state until the contact is opened (Fig. 26;).

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When the contact is opened, the logical signal O arrives at the device input 7 (FIG. 26;). The coincidence of the potentials of the input signal and the signal of the inverse output of the first trigger 45 1 at the input of the first element

EXCLUSIVE SHS 2 gives the resolution of the counter 3 counter (fig, 2c; t), However, subsequent bounce pulses (fig, ti, -ts) set the counter 3 to the initial position (zero) state. Counter 3 begins its cycle of operation after the last bounce pulse (FIG. 2c; tg-tg). If during the counting time of the counter 3 does not appear

55 bounce pulse, then a signal appears at the output of counter 3 (FIG. 2d; t), with the leading edge of which the first / trigger 1 is set to

bounce (figv;), t, e, after the last zeroing. If a bounce pulse does not appear at the counting time of the counter 3, then the output of the counter 3 is a signal (fig. 2g; tg), the leading edge of which the first trigger 1 is set to the logical 1 state, since its information input at this moment there is a high potential (fig. 26; t), while the counter 3 is reset to the zero state by the output signal of the first element EXCLUSIVE OR 2, 4 dag 2c; tj). Further, the first trigger 1 does not change its state until the contact is opened (Fig. 26;).

When the contact is opened, the logical signal O arrives at the device input 7 (FIG. 26;). The coincidence of the potentials of the input signal and the signal of the inverse output of the first trigger 1 at the input of the first element

EXCLUSIVE SHS 2 gives the resolution of the counter 3 counter (fig, 2c; t), However, subsequent bounce pulses (fig, ti, -ts) set the counter 3 to its original position (zero). Counter 3 begins its cycle of operation after the last bounce pulse (FIG. 2c; tg-tg). If during the counting time of the counter 3 does not appear

bounce pulse, then a signal appears at the output of counter 3 (FIG. 2d; t), the leading edge of which the first trigger 1 is set to

ohic o, since at its momentum input the logical ohm is at that moment (fig.26; t), and counter 3 is reset to the zero state by the signal of the first element 5 EXCLUSIVE OR 2 (fig.2c; t).

Thus, at the output of the first trigger 1, a signal is generated without rebounding, however, not coinciding in az and duration with the input signal at input 7. The inverse value of the output signal of the first trigger 1 (fig.2d) is fed to the information input of the second trigger 6, the clock input of which receives the signal from the output of the second element EXCEPTING OR 5, the first input of which receives the signal from input 7, and the second input the signal from the forward trigger of the first trigger 1.20

When the contact closes, the logical 1 signal with a bounce arrives at the counting input of the second trigger 6 via the second element EXCLUSIVE OR 5 (Fig. 2e; this time as a repeater of the input signal at 5, as its second input receives a logical O signal direct output of the first trigger 1.30

On the leading edge of the first bounce pulse coinciding with the beginning of the input signal (FIG. 26, e; t), the output 8 of the second trigger 6 sets the logic level 1 35 (FIG. 2h; t), since the information input of the second trigger 6 this moment is a high level (figd; t). Subsequent bounce pulses do not change the state of the second trigger 6, since the signal at its information input (fig.2d3; tji-tj), coming from the inverse code 3 of the first trigger 1, can change only after the end of the 45 bezg.

After the end of the bounce (Fig.26; tj-tj) after the time of recalculation of the counter 3, the first trigger 1 changes its

the state and the information input of the second trigger 6 receives a logical O (fig.2d; t). The second element EXCLUSIVE OR 5 operates at the moment of time (tj-t as an input signal inverter (fig.2e), since its second input enters logical 1 from the direct output of the first trigger 1.

When contact is opened at the leading edge of the first pulse. (Fig. 2e; t,), coinciding with the end of the input signal, the second trigger 6 is set to the logical state O (Fig. 2g; tt, y. The incoming inverted bounce pulses (Fig. 2e;) do not change the state of the second trigger 6, since the signal at its information input during this time period does not change (FIG. 2e; t).

, - J

Thus, at the output of the second trigger 7, a bounce-free signal is generated, coinciding in phase and duration with the input signal. After the first trigger 1 has been reset (fig. 2e; t), the cycle of operation is repeated.

Claims (1)

Invention Formula A device for eliminating the effect of contact bounce by bus. No. 782139, which is based on the fact that, in order to expand the functionality by generating an output signal that coincides in phase and duration with the input signal of the device, a second trigger and a second element EXCLUSIVE OR, the first input of which is connected to the input of the device, are entered into it, the second input is with the direct output of the first trigger, and the output is with the counting input of the second trigger, the output of which is the output of the device, and the information input is connected with the G inverse output of the first trigger. Editor A. Sabo Compiled by M. Tsygankov Tehred N. Bonkalo Proofreader A. Obruchar Order t723 / 58 Circulation 816 Subscription, VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow,, Raushsk nab., 4/5 . Branch PPP Patent, Uzhgorod, Proektna St., 4 fig.g