SU336792A1 - CONVERTER PHASE SHIFT TO DIGITAL CODE - Google Patents

Description

The invention relates to the field of electrical measuring equipment and can be used to convert the phase shift into a digital code. In (known phase converter

Shift to digital code using a sequential phase shift compensation mode, the measurement of which is associated with the expenditure of a relatively large period of time.

The proposed device differs from the known ones in that it is provided with a series-connected additional electronic pulse divider, the outputs of which are connected to the pulse inputs of electronic keys, as well as a trigger associated with the additional electronic key, pulse distributor and control unit. Due to this, the measurement time is significantly reduced.

The essence of the invention is to replace the sequential compensation mode of the idimensional phase shift with the bitwise compensation mode. If, in a succession compensation, to compensate for a phase shift equal to f, the number

"2 10g2-,

where Acr is the discreteness of the phase change during sequential, com, pensation.

The number of steps required to compensate for the measured phase shift and, consequently, the measurement time in the second case is much less than in the first.

With rt 6, the number of slopes in parallel mode is approximately 4 times less than in sequential mode.

The drawing shows the block diagram of the proposed Converter.

The converter contains mixers 1 and 2, phase shift indicator 3 zero, frequency dividers 4 and 5 on triggers ,,, pulse generator 6, blocks 7 and S of electronic switches / Ci-K ,,, - J, differentiating circuit 5, delay line 10 , electronic key 11, decoder 12, digital reading device 13, control unit 14, pulse distributor 15.

The device works as follows. The input voltages are fed to the inputs of the mixers and the two-channel frequency converter. Trigger frequency dividers 4 and 5 are connected to the second inputs of the mixers by the outputs. These inputs of the dividers receive pulses from the pulse generator through the control unit. The phase shift of the signals from the outputs of the trigger frequency dividers determines the phase shift of the signals from the outputs of both mixers.

A positive voltage corresponds to a phage diameter of Cd; y from O to + 180 °, negative from O to –180 °.

The measurement starts after the trigger pulse is applied to the start-up circuit. The trigger goes to the opposite state and opens the key. Pulses from the output of the frequency divider, differentiated by means of a differentiating circuit and delayed by a delay line, are fed to the input of the pulse distributor. With the arrival of the first impulse, at the first exit of the distributor, an emulsion occurs, which is fed to the electronic key blocks. The positive voltage from the output of the phase indicator opens the electronic keys of block 7, the negative voltage from block 8. The impulse from the first output of the distributor passes to the trigger G | divider 4, if the phase shift at the input of the phase indicator lies within O + 180 °, or the trigger Ti of the divider 5, if the phase shift lies within O-180 °. When a pulse arrives at one of the triggers Tu, the latter goes into the opposite state, with a phase shift of -1-90 ° or -90 °. If the phase shift of the signals at the output of the phase indicator is within O + 180 °, then an additional -90 ° phase shift occurs, if within O-180 °, an additional -1-90 ° phase shift occurs. With the arrival of the second pulse to the input of the distributor 15, a pulse arises at its second output, which passes through the corresponding electronic keys to trigger T of the divider 4 or divider

5 with an additional phase shift of + 45 ° or -45 °. So with the arrival of each pulse, an additional phase shift arises, 90

equal ±

-, where I is the number of the pulse arriving at the input of the distributor.

The impulse from the p-th output of the distributor sets to the input of the trigger 16 and returns it to the initial state. The entered key is closed and the measurement ends.

The code recorded in the trigger of splitter 4 corresponds to the measured phase shift. The read code from the divider is converted into a decimal code using a decoder and output to a digital reading device.

Subject invention

A phase shift converter into a digital code containing mixers connected by outputs to inputs (a zero-shift phase indicator, the output of which is connected to the inputs of electronic switches connected by outputs to the inputs of trigger keys

frequency dividers, which are connected to the inputs of the mixers by the first outputs, and the second outputs - one to the digital reading device through a decoder, the other to the input of the control unit, to the input

a pulse generator connected in series to a differentiating circuit and a delay line, characterized in that, in order to reduce the measurement time, a device is inserted in series

connected additional electronic key, the input of which is connected to the input of the delay line, and the output to the pulse distributor, and a trigger connected to the output with an additional electronic key and

control unit.