CN2615962Y

CN2615962Y - Double-integral analog-to-digital conversion circuit

Info

Publication number: CN2615962Y
Application number: CN 03225184
Authority: CN
Inventors: 潘伟潮
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-04-11
Filing date: 2003-04-11
Publication date: 2004-05-12
Anticipated expiration: 2013-04-11

Abstract

The utility model relates to a double-integrating analog-to-digital conversion circuit, which comprises an amplifier 1, an integrated input signal commutation circuit 2, an integrated circuit 3, a comparator 4, a controller 5 and an electrical source 6, a measured signal is connected with an input end of the amplifier 1, an output end of the integrated circuit 3 is connected with an input end of the comparator 4, an output end of the comparator 4 is connected with the controller 5, the integrated input signal commutation circuit 2 is composed of an isolating electrical resistance R 8 and an input and output end 7 of the controller 5, an end of the isolating electrical resistance R 8 is connected with an output end of the amplifier 1, the other end of the isolating electrical resistance R 8 is connected with an input and output end 7 of the controller 5, the input and output end 7 is connected with an input end of the integrated circuit 3, the double-integrating analog-to-digital conversion circuit simplifies the entire double-integrating analog-to-digital conversion circuit, decreases the number of the electronic parts, reduces the cost of products, decreases the mutual interference of the electric resistance among the circuits and comparatively saves electricity.

Description

A kind of double integrator analog to digital conversion circuit

1, technical field:

The utility model relates to a kind of double integrator analog to digital conversion circuit.

2, background technology:

At present, traditional double integrator analog to digital conversion circuit as shown in Figure 1, its principle is: the measured signal that sensor is come out is input after amplifier amplifies, enter integrating circuit and comparator by analog switching circuit, comparator is input to controller with the result and converts, and controller generally all adopts single-chip microcomputer.Analog switching circuit is mainly finished two effects: the break-make by switch inserts measured signal and reference voltage respectively, and analog switching circuit generally adopts the triode analog switching circuit, this triode analog switching circuit is comparatively complicated, number of parts is more, and its circuit part is easily produced interference, increase the cost of product.In addition, power supply is powered simultaneously for each circuit, when the double integrator analog to digital conversion circuit does not need work, still constantly is all circuit supplies, therefore relatively power consumption.

3, summary of the invention:

The purpose of this utility model provides a kind of double integrator analog to digital conversion circuit, it forms integration input signal commutation circuit by an input/output port in isolation resistance R8 and the controller, utilize two the kind states of an input/output port output in the controller, i.e. relatively-stationary reference voltage signal and high impedance status, insert reference voltage and measured signal respectively, simplified whole double integrator analog to digital conversion circuit, reduced the number of electronic component, reduce the cost of product, reduced resistance phase mutual interference between the circuit.

The utility model is achieved by the following technical solution: it comprises amplifier, integration input signal commutation circuit, integrating circuit, comparator, controller and power supply, measured signal connects amplifier input terminal, the output of amplifier connects the input of integration input signal commutation circuit, the output of integration input signal commutation circuit connects the input of integrator, the output of integrator connects the input of comparator, the output of comparator is connected on the controller, integration input signal commutation circuit is made up of an input/output port in isolation resistance R8 and the controller, the end of isolation resistance R8 connects the output of amplifier, the other end of isolation resistance R8 is connected with a input/output port in the controller, and input/output port connects the integrating circuit input.

A wherein end of the power supply supply loop of analog circuits such as above-mentioned described amplifier, integrating circuit, comparator is connected with the input/output port of controller, is directly powered to analog circuits such as amplifier, integrating circuit, comparators by the input/output port of controller.

The utility model compared with prior art has following advantage: its integration input signal commutation circuit is made up of an input/output port in isolation resistance R8 and the controller, utilize two the kind states of an input/output port output in the controller, i.e. relatively-stationary voltage signal and high impedance status, insert reference voltage and measured signal respectively, simplified whole double integrator analog to digital conversion circuit, reduced the number of electronic component, reduce the cost of product, reduced resistance phase mutual interference between the circuit and the generation of the distorted signals situation that produces; A wherein end of the power supply supply loop of analog circuits such as amplifier, integrating circuit, comparator is connected with the input/output port of controller, input/output port by controller is directly powered to analog circuits such as amplifier, integrating circuit, comparators, when the double integrator analog to digital conversion circuit does not need work, cut off the electricity supply by controller, stop to other circuit supply, therefore more energy-conservation.

4, description of drawings:

Below in conjunction with accompanying drawing the utility model is done detailed explanation:

Fig. 1 is the circuit block diagram of traditional double integration analog to digital conversion circuit;

Fig. 2 is the utility model circuit block diagram;

Fig. 3 is the circuit diagram of Fig. 2 correspondence.

5, embodiment:

As Fig. 2, shown in Figure 3, the utility model comprises amplifier 1, integration input signal commutation circuit 2, integrating circuit 3, comparator 4, controller 5 and power supply 6, measured signal connects the input of amplifier 1, the output of amplifier 1 connects the input of integration input signal commutation circuit 2, the output of integration input signal commutation circuit 2 connects the input of integrator 3, the output of integrator 3 connects the input of comparator 4, the output of comparator 4 is connected on the controller 5, integration input signal commutation circuit 2 is made up of an input/output port 7 in isolation resistance R8 and the controller 5, the end of isolation resistance R8 connects the output of amplifier 1, the other end of isolation resistance R8 is connected with a input/output port 7 in the controller 5, and input/output port 7 connects integrating circuit 3 inputs.

A wherein end of the power supply supply loop of amplifier (1), integrating circuit (3), comparator analog circuits such as (4) is connected with the input/output port (8) of controller (5), is directly powered to amplifier (1), integrating circuit (3), comparator analog circuits such as (4) by the input/output port (8) of controller (5).When needs work, voltage of an input/output port 8 outputs of controller 5 can be the no-voltage of ground connection, makes each several part analog circuit operate as normal; When not needing work, voltage of an input/output port 8 outputs of controller 5, the each several part analog circuit quits work.Controller 5 can be single-chip microcomputer or digital signal processor.

Controller 5 control input/output ports 7 are respectively as two kinds of output states, a kind of output state is: export a relatively-stationary voltage signal as reference voltage, the ground of supply voltage or no-voltage for example, make integration input signal commutation circuit 2 switch to reference voltage signal, at this time, the voltage signal that is input to integrating circuit 3 is a reference voltage signal; When the another kind of state of controller 5 control input/output ports, 7 outputs, promptly not with the input state of pull-up resistor, we claim high impedance status, make integration input signal commutation circuit 2 switch to measured signal through amplifying, at this time, be input to the measured signal of the voltage signal of integrating circuit 3 for the process amplification.As shown in Figure 3, measured signal is to be measured by transducer 9.

Claims

1, a kind of double integrator analog to digital conversion circuit, comprise amplifier (1), integration input signal commutation circuit (2), integrating circuit (3), comparator (4), controller (5) and power supply (6), measured signal connects the input of amplifier (1), the output of amplifier (1) connects the input of integration input signal commutation circuit (2), the output of integration input signal commutation circuit (2) connects the input of integrator (3), the output of integrator (3) connects the input of comparator (4), the output of comparator (4) is connected on the controller (5), it is characterized in that what integration input signal commutation circuit (2) was made up of the input/output port (7) in isolation resistance R8 and the controller (5), the end of isolation resistance R8 connects the output of amplifier (1), the other end of isolation resistance R8 is connected with an input/output port (7) of controller (5), and input/output port (7) connects integrating circuit (3) input.

2, a kind of double integrator analog to digital conversion circuit according to claim 1, a wherein end that it is characterized in that the power supply supply loop of amplifier (1), integrating circuit (3), comparator analog circuits such as (4) is connected with the input/output port (8) of controller (5), is directly powered to amplifier (1), integrating circuit (3), comparator analog circuits such as (4) by the input/output port (8) of controller (5).