RU2332786C1 - Frequency synthesiser controller - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: device contains system of inputs supplied with power and driving signals travelling through galvanic decoupling circuit to input of microcontroller, switchboard, frequency synthesiser, additional circuit paralleled to microcontroller circuit and consisting of phase circuit with driving signals supplied to input and output connected to power relay coil, in parallel to which capacitor is connected. Through normally open contact of power relay, the power signal is supplied to parallel first windings N of code memorising relay, the in second winding outputs being connected to output of relay driving circuit. The first inputs of the said relay driving circuit are connected to microcontroller and its second inputs to the second inputs of switchboard. Logic 0 or 1 signals are supplied at a time to the second inputs of relay driving circuit and switchboard through switching contacts of code memorising relay.

EFFECT: improved reliability and stability to special factors of frequency synthesiser controller.

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Description

The invention relates to radio engineering, and in particular to devices for generating oscillations with a frequency that varies in accordance with the value of the digital control code.

A control device for a frequency synthesizer with a phase-locked-loop frequency control system in a radio frequency transceiver comprising a microcontroller for adjusting the frequency depending on a specific channel arrangement [1] is known.

However, when exposed to special factors, there is a danger of a malfunction of the microcontroller and, as a consequence, a malfunction of the entire device.

The objective of the invention is to increase the reliability and resistance to special factors of the control device of the frequency synthesizer.

The task is achieved by the fact that in the control device of the frequency synthesizer with a phase-locked loop system containing a system of inputs to which power is supplied and control signals going through a galvanic isolation circuit to the input of the microcontroller, the outputs of which are connected to the first inputs of the switch, from the outputs of which a signal in the form of an N-bit parallel code is fed to the inputs of the frequency synthesizer, an additional circuit is included in the frequency synthesizer control device, included I am parallel to the microcontroller circuit and consisting of a phase availability circuit, to the input of which control signals are supplied, and the output is connected to the winding of the power relay, parallel to which a capacitor is connected, through a normally open contact of the power relay, the power signal is applied to the first connected leads of the N relay windings remembering the code, the second conclusions of the windings of which are connected to the outputs of the relay control circuit, the first inputs of which are connected to the microcontroller, the second inputs of which are They are connected to the second inputs of the switch, and at the same time, the logic level signals "0" or "1" are supplied to the second inputs of the relay control circuit and the switch through the switching contacts of the code memory relay.

The essence of the invention lies in the fact that an additional circuit is introduced into the frequency synthesizer control device, consisting of series-connected phase presence circuits, a power-on relay, a relay control circuit and a code memory relay, which ensures the reliability of the frequency synthesizer control device under the influence of special factors.

The drawing shows an electrical diagram of a synthesizer control device containing a microcontroller 2, the input of which receives control signals through a galvanic isolation circuit 1, and the outputs of the microcontroller are connected to switch 3, the outputs of switch 3 are connected to N inputs of synthesizer 4, while parallel to the circuit of microcontroller 2 is connected additional circuit containing a phase 5 circuit, a power-on relay 6, a relay control circuit 7 and a code 8 memory relay with a parallel relay coil Ia power capacitor 6.

The control device of the frequency synthesizer operates as follows. A continuous microwave signal is generated by a microwave generator, which is used as a frequency synthesizer, the frequency value of the microwave signal is determined by the control signals received from the source of control signals. The frequency tuning of the synthesizer 4 is carried out by a 15-bit parallel binary code generated by the microcontroller 2 from the source of control signals with the signals "+ 27V Phase 1PK" "+ 27V Phase 2PK", "+ 27V Phase 3PK", "+ 27V Phase 4PK".

These signals are meanders shifted 90 ° (1/4 period) relative to each other. The signals "+ 27V Phase 1PC", "+ 27V Phase 2PC" through the decoupling circuit of the input signals are fed to the microcontroller 2, which analyzes the following parameters of these signals:

- Availability;

- phase shift between the signals "+ 27V Phase 1PC", "+ 27V Phase 2PC";

- the size of the period.

Depending on the sign of the phase shift and the period of these signals, the microcontroller 2 generates a 15-bit parallel binary control code for the switch 3.

The code 8 memory relay is a magnetic-lock remote switch.

The sign of the phase shift of the signals determines the direction of tuning the frequency of the synthesizer to the beginning or end of the tuning range.

The zero code corresponds to the lower frequency of the tuning range of the synthesizer 4. To ensure tuning of the frequency of the synthesizer in a given frequency range with a tuning step of 50 kHz, a control signal in the form of a 15-bit parallel code is used.

If the signal “+ 27V Phase 1PC”, “+ 27V Phase 2PC” disappears at the input of the controller, microcontroller 2 stops the code change and generates commands issued to the code 8 relay. To ensure the code 86 relay to operate, the voltage is +12.6 V it is supplied through the contacts of the power-on relay 6, which is triggered when there are signals "+ 27V Phase 1PC", "+ 27V Phase 2PC", "+ 27V Phase 3PC", "+ 27V Phase 4PC" and turns off after a delay time determined by the capacitor’s electric capacity . The delay time is chosen longer than the analysis time by the microcontroller 2 of the lack of signals "+ 27V Phase 1PK", "+ 27V Phase 2PK" and the formation of control commands for the memory relay.

After the power relay 6 is turned off, the voltage is +12.6 V, the contacts of this relay are disconnected from the windings of the code 8 memory relay, which ensures that the code is memorized when exposed to special factors.

Thus, the introduction of an additional circuit into the circuit of the frequency control device of the synthesizer, consisting of a series-connected phase presence circuit, a power-on relay, a relay control circuit and a code memory relay, ensures high performance and increases the reliability of the frequency synthesizer control device under the influence of special factors.

Information sources

1. Patent No. 21010151, “Device and method for controlling a frequency synthesizer with a phase-locked loop frequency-dependent system depending on the arrangement of radio frequency channels,” Н03В 1/40, pr. 10.11.1994,

Claims (1)

A control device for a frequency synthesizer with a phase-locked loop system containing a system of inputs to which a power signal and control signals are fed through a galvanic isolation circuit to the input of a microcontroller, the outputs of which are connected to the first inputs of the switch, from the outputs of which the signal is in the form of an N-bit the parallel code is fed to the inputs of the frequency synthesizer, characterized in that an additional circuit is connected in parallel to the frequency synthesizer control device, connected in parallel microcontroller circuit and consisting of a phase presence circuit, to the input of which control signals are supplied, and the output is connected to the winding of the power-on relay, in parallel to which a capacitor is connected, through a normally open contact of the power-on relay, the power signal is supplied to the first connected leads of the N memory coils the second terminals of the windings of which are connected to the outputs of the relay control circuit, the first inputs of which are connected to the microcontroller, the second inputs of which are connected to the second inputs of the switch, and at the same time, the logic level “0” or “1” signals are sent to the second inputs of the relay and switch control circuits through the switching contacts of the code memory relay.