SU1403375A1 - Pulsewidth converter of analog signals - Google Patents

Abstract

The invention relates to a measurement technique and can be used in devices for encoding or modulating analog signals in multichannel measurement data telecast systems. The aim of the invention is to expand the scope due to the possibility of multi-channel conversion of analog signals. When successively arrives at the reset bus 15 and the pulse start bus 16, the integrator, 5 switches the initial setting key 4 and the binary counter 3 pulses through the OR element 2 is transferred to the first state, in which the negative reference voltage goes through the integrator input 12 5, at the output of which a linearly increasing voltage is generated. The comparator 6 compares the input voltage of the corresponding channel on the input buses 14, which is switched to its input by the switch 8, with the output voltage of the integrator 5, forming a signal on the output bus 17, which also switches the binary counter 3. At the same time, the switch 8 turns off the corresponding input the bus from the input of the comparator 6 and connects it through the current limiting element 7 to the bus of zero potential, and at the output of the integrator 5 a linearly falling voltage is formed by connecting to its input through the key 13 through the positive voltage of the bipolar source 1. When the signals at the input of the comparator 6 are equal, the bus 17 signal forms a cycle ending signal. When the next trigger pulse arrives on bus 16, the next input signal is generated. 1 hp f-ly, 1 ill. (O 00 with 1 ate

Description

The invention relates to measuring equipment and can be used in devices for encoding or modulating analog signals in multichannel television transmission systems of measurement data.

The aim of the invention is to expand the scope due to the possibility of multi-channel conversion of various analog signals;

The drawing shows a structural electrical circuit of a pulse-width converter analog 15 signals.

The converter contains a bipolar reference voltage source 1, an OR element 2, a Zimpulsov binary counter, an initial setup key 4, an integrator 5, a comparator 6, a current-limiting element made on a resistor 7, a switch 8 made on a decoder 9 and m keys 10 , inverter 11, keys 12 and 13, input 25 of bus 14, reset bus 15, trigger bus 16 and output bus 17.

The device operates as follows.

Before each cycle of multichannel jq conversion, a short pulse is applied to the input of counter 3 installation via bus 15, which puts it into a zero state, thereby preparing the device for operation. ·

When a trigger pulse is received on the bus 16, the integrator 5 is reset through the initial setting key 4, the counter 3 is transferred to the first state through the OR element 2. In this case, the input of the integrator through the public key 12 receives a negative reference voltage - U _0lt , which at the output of the integrator 5 is converted into a linearly increasing voltage. An input signal U _{BX (of the} first channel) is supplied to the second input of comparator 6 through the first public key 10. At the moment of equal voltage at the inputs of comparator 6, a voltage drop is formed at its output, which is fed to the input of counter 3 through the element OR 2 and translates the counter 3 into second state.

In this case, the first analogue key 10 of switch 8 and key 12 are closed - ^ 5, the key 13 is opened, which leads to the connection of the second input of the comparator 6 through the resistor 7 to the bus of zero potential, and the input of the integrator 5 to the positive reference voltage + U _On bipolar source 1. The integrator 5 generates a linearly incident voltage at its output. If the signals at the inputs of the comparator 6 are equal, a negative voltage drop is formed at its output, indicating the end of the conversion cycle of the first analog input signal to the PWM signal, which is formed on the output bus 17. With the arrival of the next trigger pulse, the second analog input signal U _{6Xa is converted} as described above principle, etc.

To convert signals in the m channel system, the capacity of the counter 3 must be at least 2 sh.

Claims (2)

Claim 1. A pulse-width analog signal converter containing a comparator, the first input of which is connected to the outputs of the integrator and the initial installation key, the information input of which is combined with the integrator input and connected to the outputs of the first and second keys, the information inputs of which are connected to the corresponding outputs of the bipolar reference source voltage, characterized in that, in order to expand the scope due to the possibility of multi-channel conversion of various analog signals, it is entered It's an OR element, an inverter, a binary pulse counter, a switch and a current-limiting element, the first output of which is a bus of zero potential, and the second output is combined with the second input of the comparator and connected to the output of the switch, the information inputs of which are the corresponding input buses, and the control inputs are connected to the corresponding outputs of the binary pulse counter, the installation input of which is a reset bus, and the counting input is connected to the output of: OR element, the first input of which is combined with the control they input key is the initial setting and the bus; start, and the second input is connected to the output of the comparator and is the output bus, while the control input z the second key is connected to the output of the inverter, the input of which is combined with the control input of the first key and is connected to the output of the least significant bit of the binary pulse counter. 2. The converter according to claim 1, wherein the switch is arranged on a decoder and by the number of input bus keys, the outputs of which are combined and are the output of the switch, the information inputs of which are the information inputs of the corresponding keys, * the control inputs of which are connected to the corresponding odd outputs of the decoder, the inputs of which are the corresponding control inputs 10 of the switch.