SU1598111A1 - Multichannel d.c. voltage amplifier - Google Patents

Abstract

The invention relates to automation and measurement technology. The purpose of the invention is to simplify the device. The multichannel DC amplifier contains an input switch 1, a decoder 2, a pulse-width modulator (PWM) 4, N key amplifiers 14, N filters 15. The purpose of the invention is achieved by using one PWM to convert the input signal in all amplifier channels of the device . 1 il.

Description

The invention relates to automation and measuring equipment and can be used in computing and information devices to amplify signals taken from sensors of control and management.

The purpose of the invention is to simplify the device,

The drawing shows an electrical block diagram of a multi-channel voltage during one clock cycle of the second counter. 7.

Triggers 12 and additional triggers 13 are switched to a single state at the trailing edge of the output pulse of decoder 2, if the input voltage exceeds the reference voltage of the corresponding polarity, and switching to the zero state occurs at the instantaneous DC amplifier. The multi-channel amplifier contains an input switch 1, a decoder 2, a delay element 3, a pulse-width J5 modulator (PWM) 4, a clock generator 5, the first and second counters 6 and 7, the first and second digital-to-analog converters (DACs) 8 and 9 , the first and second comparators 10 20 and 11, N triggers 12, N additional triggers 13, N key amplifiers 14, N low-pass filters 15.

A multi-channel constant voltage amplifier 25 operates as follows.

time when the input voltage becomes less than the reference voltage.

Thus, the outputs of the triggers 12 and additional triggers 13 in each channel generate signals whose duration is proportional to the input voltage at the corresponding input of the device, and the frequency is determined by the frequency of the generator 5.

Pulse-width signals from the outputs of the triggers 12 and additional triggers 13 are fed to the corresponding key amplifiers 14, amplified in them and transmitted through the filters 15 to the output of the device.

The beneficial effect of the invention

In the initial state, the first and second counters 6 and 7, triggers 12 and additional triggers 13 are set to the initial state. Under the influence of the output pulses of the generator 5, a monotonically increasing digital code is formed at the outputs of the first counter 6. In accordance with this code, the control pulses distributed over time are generated at the outputs of the decoder 2, which arrive at the control inputs of the triggers 12 and additional triggers 13 and provide for the serial connection of key amplifiers 14 to the outputs of the first and second comparators 10 and 11.

At the same time, the corresponding input signal enters through the input switch 1 to the inputs of the first and second comparators 10 and 11, the other inputs of which receive reference and antiphase stepwise varying voltages proportional to the output digital code formed at the output of the second counter 7.

achieved by performing pulse-width modulator 4 in a multi-channel scheme.

Claims (1)

Claim A multi-channel constant voltage amplifier comprising the i-th key amplifier and the i-th output low-pass filter, where i = 1,2 ,, .., Ν, a pulse-width modulator, characterized in that, in order to simplify the device, a pulse-width modulator is made on a series-connected clock generator, a first counter, a second counter, a first digital-to-analog converter and a first comparator, on N triggers whose inputs are connected to the output of the first comparator, on series-connected the second digital-to-analog converter and the second comparator, on N additional triggers, the inputs of which are connected to the output of the second comparator, on the serial connection. This ensures a sequential comparison of the input voltage of all channels with the time-varying reference voltage of the input switch and the delay element, as well as on the decoder, with the inputs of the input switch are the corresponding inputs of a multi-channel constant amplifier on 159811t voltage, the control inputs of the input switch are connected to the corresponding outputs of the decoder and the corresponding control inputs ϊ-χ triggers, where i = 1,2 ,,., N, the inputs are de | The encoder $ is connected to the corresponding outputs of the first counter, the inputs of the second digital-to-analog converter are connected to the corresponding outputs of the second counter, the output of the delay element is connected to the second inputs of the first and second comparators, the output of the i-th trigger is connected to the first input of the i-th key amplifier, where is1, 2, ..., N, and the output i-ro of an additional trigger is connected to the second input i-ro of the key amplifier, where i = 1,2, ..., Ν ..