SU783978A1 - Analogue-digital conversion method - Google Patents

Description

voltage, remember the integral of the latter. The obtained voltage is integrated by the first integrator during the Memorized time interval and the discharge of the first integrator down to zero by the voltage, forms a time interval that is converted into a code. The method can be implemented using a direct-current ADC consisting of a reference voltage source, two integrators, a zero-organ and a control unit, the controlled switch is connected to the input of each integrator and the input of the first integrator is also connected to the input the entire device connected through the interfering unit to the control unit. During the period of disturbance, the input voltage is integrated by the first integ-. RATOR The amount of electricity accumulated during the charge of this integrator. 1 и, Х - itt- M у т, U) о where е.х5) пЬ | п (и) г + Ф) input voltage; measured voltage; period of interference; resistance in the feedback circuit of the first integrator; amplitude of the interference; the initial phase of the interference is relative to the integration interval. during the same time, the second integrator integrates the reference voltage. At the end of the integration time, the output voltage Ug. second integration, / where 1% is the reference voltage; Tn is the time constant of the second integrator. Then, the first integrator integrates B1 | {the input voltage of the second, available at that time, in memory mode, until the first iHtogrator is completely discharged. When emsl the amount of electrical discharge “.Cf The discharge time T of the first integrator is fixed in the control unit, for example, by remembering the number of Ny pulses of the reference generator corresponding to the discharge time of Tu N m. U - de TQ - the period of the pulse. reference generator. Thereafter, the second integrator restores and integrates the reference voltage with it within a calibrated time interval. , while the output voltage of the second integrator ... Then, the discharge time of the first integrator Tu is reproduced, for example, by writing the number Ny from the counter by pulses of the reference generator. Playback time., .. toU. (6) tzhl. During this time, the output voltage of the second integrator, which is currently in memory mode, is integrated by the first integrator, and then discharged to zero at a constant speed. The time of this discharge Tp is determined from the balance equation for the quantities of electricity at charge & O and discharge. of the first integrator, and o, N.XU where QS dtr 0.1 1 4: ri: Uo As a result of the encoding of the time interval T0, the measurement signal of the reference generator gives the result of the measurement Tr N "-: r ---: V Formula of the invention transformations, including simultaneous integration of the first and second input signals during the first time interval, respectively, by the first and second integrators, remember the integrated voltages, and the first integrator integrates the output voltage of the second integrator.

57839786

characterized in that the time interval and the discharge of the first

in order to increase the accuracy, the integrator is remembered to zero by the reference voltage,

the time interval is determined by the integration, a time interval is formed,

the first integrator of the output nap — which is converted into code. The second integrator, the return of information sources,

the last initial state is taken into account in the examination, and it is integrated for them during this one year period. 1. A. V. Nishnikov. Integral interval of time, reference voltage, constant digital voltmeters

remember the integral of the latter, integ-current. L., Energie, 1976, p. 179. The first voltage received is the first 2 received. U.S. Patent No. 3,624,643, CL 340-347,

by the integrator over the memorized 1971 (prototype).

Claims (1)

Claim A method of analog-to-digital conversion, including the simultaneous integration of the first and second input signals during the first time interval by the first and second integrators, respectively, remembers the integrated voltages, integrates the output voltage of the second integrator by the first integrator, s 783978 6 characterized in that, in order to increase accuracy, remember the integration time interval by the first integrator of the output voltage of the second integrator, return the latter to its original state and integrate m during a second time interval a reference voltage, storing the last integral is integrated voltage obtained first integrator for the stored interval time, and the discharge of the first integrator to zero voltage reference, Niemi form a time interval which is converted into the code.