SU871144A2 - Electronic timepiece - Google Patents

Description

The invention relates to an electronic clock technology and can be used to read and display in digital form the current time and to sound the alarm by preset time. According to the main auth. ft 794604 an electronic clock is known that contains a series-connected reference frequency generator and a divider whose output is connected via the first matching circuit to the first input of the OR circuit, to the second input of which, through the second matching circuit, the output of the reference frequency generator is connected, series-connected unit counters and ten minutes and clocks that are associated with the indicator and the switch. The switches of the switches are connected to the input of the third matching circuit, the output of which is connected to the second input of the second cxetea Yeni. The second input of the first coincidence circuit is connected with the opening contacts of the input device, and the third input of the second combination circuit with the flashing contacts. The disadvantage of this type of watch is the impossibility of verifying the reliability of switching on the time setting switches to the open position; The goal is achieved by introducing a single pulse shaper into the electronic clock, an additional three-input matching circuit, an Amplifier, a loudspeaker and four additional OR circuits, through the first inputs of which the counters of units and tens of minutes and hours are connected to the time setting switches Matching through the amplifier, a loudspeaker, a single pulse shaper, is connected. The input of the single pulse generator is connected to the audible alarm switch, and the output with the second inputs of the additional OR circuits. The second input of the additional three-input coincidence circuit is connected with the second output of the divider, and the third one with the output of the third coincidence circuit, the inputs of which are shunted by resistive. ramie. The drawing shows a diagram of an electronic clock. The electronic clock contains a crystal oscillator of the reference frequency 1, frequency divider 2, counters 3-6 connected to indicator 7, switches set 8-11, input device 12, coincidence 13-16 cxe№J (coincidence circuit 15 - multi-input), circuit OR 17, an audible alarm switch 18, an amplifier 19, a single pulse loudspeaker 20, 21, a group of logic circuits OR 22-25 and resistors 26-29.

Electronic clocks work as follows.

The high frequency from the crystal oscillator 1 is fed to the first input of the matching circuit 14 and the frequency divider 2. The high potential of the logical unit coming from the closed contacts of the input device 12 to the second input of the matching circuit 13 allows the clock frequency from the divider 2 to pass through the OR circuit 17 to the counting the input of the counter 3. The low potential of logical zero, coming from the disconnecting contacts of the button 12 to the second input of the coincidence circuit 14, prohibits the passage of high frequency from the crystal oscillator OR circuit 17.

Counters 3-6 count the clock pulses, and the information is displayed on the indicator.

To enter the start time on the switches 8-11, you need to enter the necessary digits and press the input button of the start time 12. In this case, the low potential from the closing contacts prevents the passage of clock pulses through the coincidence circuit 13, and the high potential of the logical unit allows the passage of high frequency pulses through the circuit coincidence 14, the third (inverse) input of which is fed a low potential of logical zero from coincidence circuit 15 to the counting input of counter 3. The counting of high frequency pulses occurs to ex long as all the outputs of the counters whose numbers correspond to the position of switches are not in a logic high potentials edinitsy.Eti. units through the OR circuits and switches are fed to the input of the coincidence circuit 15. In this case, the unit is fed to the inverted input of coincidence 14 and prohibits the passage of high-frequency pulses through the OR circuit to the counter of voltages 3.

In order to make sound control of the end of setting the start time, switch 18 has to be opened. Then the high potential of the unit applied to the third input of the coincidence circuit 16, and the unit with coincidence cxeNbj 15 permits the passage of audio frequency pulses from the frequency divider to the second input of the coincidence circuit 16, through the amplifier 19 on the loudspeaker 20. The sound frequency emitted by the loudspeaker 20 signals the end of the initial time setting.

The installation time depends on the frequency of the crystal oscillator and can be calculated by the formula

T

TO

where F is the frequency of the quartz oscillator;

K - clock conversion factor, 0 equal to the product of the conversion factors of all counters.

With a frequency of F 109 kHz and a coefficient for recalculating the clock K 1/10 x x1 / 6 1/10 1/3 t1 / 1800, the setting time is

1800

T

0.018 seconds

100,000

After the setting is completed, the button 12 is released. At the same time, the passage of clock pulses to the counting input of counter 3 is permitted, and the normal operation of the clock is resumed.

The elements and connections available in the circuit allow audible signaling of the installation, i.e. at a predetermined time point. To do this, on the switch 8-11 you need to set the desired values of the numbers and open the contacts

switch 18. When this occurs, the automatic control of the health of the circuit switches. When the audible alarm is opened, the unit is fed to the driver,

which forms a short unit signal. This signal is applied to the inputs of a group of circuits OR 22-26. If all the switch chains are intact, the units are fed to the coincidence circuit 15, and from it to the coincidence circuit 16. This activates the loudspeaker for a time equal to the duration of the interrogation pulse. If there is no contact in any switch, the unit does not match the 15 circuit, since its inputs are connected to the common wire through resistors 26-29, and the potential zero will always be at the faulty input and, therefore, the enabling signal will not pass to the circuit coincidence 16. The absence of a short signal when the audio alarm switch 18 is open contacts indicates a malfunction in the circuit of the switches.

With a high potential at the output of the coincidence circuit 15, the transmission of the acoustic frequency from the divider through the coincidence circuit is permitted.

Claims (1)

0 16 on the power amplifier and dynamic speaker. The sound frequency emitted by the loudspeaker indicates the coincidence of the time induced on the indicator with the time set on the switches. D) The omco-speaker works until the counters change their order, and this will happen after a time equal to the time between two clock pulses, i.e. after one minute or until the contact closure is turned on, l 18. The electronic clock with a relatively simple circuit and a small number of elements included in it allows not only to precisely induce time, but also to control the completion of the initial time setting with a sound signal, and also allow sound indication at the right moment of time at the exhibition - and control of the switch circuit after the exhibition. Thus, the functionality of the electronic clock has been expanded with little or no increase in the number of elements. Invention formula Electronic clock according to the author. 794604, characterized in that, in order to improve the reliability of reading, they have introduced a single pulse shaper, an additional three-input circuit of the amplifier, loudspeaker and four additional OR circuits, through the first inputs of which the counters of units and ten minutes and hours are connected to the set switches time, to the output of the three-input coincidence circuit, is connected loudly through the amplifier, the speaker-, the input of the single-pulse former is connected to the audible alarm switch, and the output to the second inputs and additional OR circuits, the second input of the additional three-input coincidence circuit is connected with the second output of the divider, and the third one - with the output of the third coincidence circuit, the inputs of which are bypassed by resistors. Sources of information taken into account in the examination. 1. USSR author's certificate No. 794604, cl. G 04 C 3/00, 11.12.78.