SU1169161A1 - Pulse-frequency converter - Google Patents

Abstract

FREQUENCY-PULSE. CONVERTER on auth. St. No. 995318, which is distinguished by the fact that, in order to improve the accuracy of the conversion, an element NOT is entered into it, the input of which is connected to the output of the third key, and the output to the input of the positive feedback of the controlled oscillator.

Description

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F (/ g / 1) The invention relates to a pulse technique and can be used in automation and remote control devices. A pulse frequency converter is known from the main author No. 995318, which contains a control generator, a reference generator, two counters and three keys the output of the first key is connected to the counting input of the first pulse counter, the output of the second key is connected to the counting input of the second pulse counter, the first inputs of the keys are connected to the output of the reference frequency generator, the first input of the third key is connected to the output of the control generator, the second input with the output of the penultimate discharge of the first pulse counter and the second input of the second key, and the third input with the output of the penultimate discharge of the second pulse counter, the output of the last bit of which is connected to the control input of the controlled generator and the second input the first key, the output of the third key is connected to the third inputs of the first and second keys; during the last discharge of the first pulse counter is connected to the control input of the generator, the reference part, and the input of the controlled generator The ramp is connected to the bus of the measured pressure, and the reference frequency generator input is connected to the start terminal of the inverter D1. A disadvantage of the known converter is the low conversion accuracy. The purpose of the invention is to increase the conversion potential. The goal is achieved by introducing an element NOT into the pulse frequency converter, the input of which is connected to the output of the third key and the output to the input of the positive feedback of the controlled oscillator. FIG. 1 shows a block diagram of the frequency-pulse converter} in FIG. 2 - time diagrams, according to his work. The converter contains a controlled generator 1, a reference generator 2, counters 3 and 4 pulses, the first 5, the second 6 and the third 7 keys and the element NOT 8, the input of the controlled generator 1 is connected to the measured voltage bus 9 612, the controlled input - to the output of the last digit of counter 4 and the input of the key 5, and the output to the first input of the key 7, the output of which is connected to the first inputs of the keys 5 and 6 and the input of the element NO 8, the output of which is connected to the input of the positive feedback generator 1, output the last but one bit of counter 3 is connected to the second inputs and keys 6 and 7, the output of the penultimate discharge counter 4 is connected to the third input key 7, the inputs of counters 3 and 4 are connected to the outputs of keys 5 and 6 respectively. The first input of the generator 2 is connected to terminal 10 (start of the converter), the second input with the output of the last digit of the counter 3, and the output with the second inputs of keys 5 and 6, The outputs of the counter 4 are connected to the output buses (outputs) 11 of the device. FIG. 2 is indicated by: a is the signal at the output of the last but one bit of 4 :, b is the signal at the output of the last but one. counter 3 counter; in - the signal generated by the key 7; g is the signal at the output of the key 7; e - the signal at the output of the generator 2. The device operates as follows. At the moment te, a pulse is received at terminal 10 for the device to start working. Conversion of the measured parameter to the binary code of the process; it takes four clock cycles in the time interval t,..., T (Fig. 2). On the second and fourth conversion cycles (t, - t.) Counters 3 and 4 are filled with oscillator 2 pulses. The state of the penultimate bits of Counters 4 and 3 is shown in FIGS. 2a, b, respectively. According to the state of these bits in the key 7, a signal is generated (FIG. 2c) for the generator 1 to start operating. A logical combination of this signal with the output of the generator 1 allows the NOT 8 element to organize a positive feedback circuit for generator 1. At times t and t, (the first and third conversion cycles) the positive feedback circuit is broken by key 7 and generator 1 does not work, At time t) (FIG. 2d) when the next one arrives

the pulse from generator 2 changes the state of key 7, closes the positive feedback circuit of generator 1, and pulses from the output of generator 1 through key 7 arrive at the input of keys 5 and 6. Considering that the change in the state of key 7 is determined by the front (rear a) the pulse front of the generator 2, the beginning of pa1169161. four

bots of generator 1 will coincide in phase with the pulses of generator 2,

The introduction of the element into the converter does NOT ensure the synchronization of the start of operation of the controlled generator with the phase of the generator pulses of the reference frequency, thereby increasing the conversion accuracy.

Claims (1)

FREQUENCY-PULSE. CONVERTER by 'ed., St. No. 995318, distinguished by the fact that, in order to increase the accuracy of the conversion, an element was introduced into it NOT, the input of which is connected to the output of the third key, and the output to the positive feedback input of the controlled generator. Figure 1