CN112558674A - Analog quantity current output system - Google Patents
Analog quantity current output system Download PDFInfo
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- CN112558674A CN112558674A CN202011401000.4A CN202011401000A CN112558674A CN 112558674 A CN112558674 A CN 112558674A CN 202011401000 A CN202011401000 A CN 202011401000A CN 112558674 A CN112558674 A CN 112558674A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
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Abstract
An analog current output system comprising: the device comprises a rail voltage power supply selection module, a voltage-current conversion module and a voltage comparison module; a first input end of the voltage-current conversion module receives the control voltage signal, and a second input end of the voltage-current conversion module is connected with an output end of the rail voltage power supply selection module; the voltage comparison module comprises a Schmitt trigger, a first input end of the Schmitt trigger is connected with a feedback signal end of the voltage-current conversion module, a second input end of the Schmitt trigger is used for acquiring a first reference voltage and a second reference voltage, and an output end of the Schmitt trigger is connected with a control end of the rail voltage power supply selection module and is used for outputting a voltage control signal for controlling the magnitude of the output voltage of the rail voltage power supply selection module based on a comparison result of the feedback signal, the first reference voltage and the second reference voltage; the rail voltage power supply selection module is used for outputting rail voltage changing along with the output voltage of the Schmitt trigger to the voltage-current conversion module.
Description
Technical Field
The invention relates to the technical field of integrated circuits, in particular to an analog quantity current output system.
Background
Analog quantity current (such as 4 mA-20 mA) output system is commonly used for driving and controlling the actuating mechanism of production site and public engineering, and the driving voltage is generally 24V. Because the actuating mechanisms are different and have different impedances, when the product of the input impedance and the output current of the actuating mechanism is smaller in the process of driving and controlling the actuating mechanism by the output current, the voltage drop in the analog quantity current output system is larger, so that a large amount of power is consumed in the analog quantity current output system, particularly consumed on a voltage adjusting tube, thereby not only causing the waste of a large amount of electric energy, but also greatly increasing the internal temperature of the analog quantity current output system, greatly shortening the service life of electronic components, easily generating various faults in the system and reducing the reliability of the system. In the prior art, an analog output system is improved, for example, in a low-power consumption modular current output system and method, a feedback voltage output module acquires voltage drops at two ends of a voltage adjusting tube and then generates feedback voltage to the voltage adjusting output module, so that the driving voltage is adjusted, the voltage drops at two ends of the voltage adjusting tube are controlled in a lower range, the internal power consumption of the analog current output system is controlled, and the purpose of low-power consumption design is achieved. However, the conventional method needs to have a voltage regulation module and a voltage regulator feedback voltage output module. The adjustable voltage output module is formed by a series of devices such as a power chip and an inductor, and has the characteristics of high requirement on load adjustment performance, instability of the feedback output module and the like. Meanwhile, the large-scale and high-cost circuit is not favorable for the trend of miniaturization and low cost of the future circuit scale.
Disclosure of Invention
In view of the above, embodiments of the present invention provide an analog current output system, so as to provide a low-cost and small analog current output system.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
an analog current output system comprising:
the device comprises a rail voltage power supply selection module, a voltage-current conversion module and a voltage comparison module;
a first input end of the voltage-current conversion module receives a control voltage signal, and a second input end of the voltage-current conversion module is connected with an output end of the rail voltage power supply selection module directly or through a load and is used for controlling a duty ratio of voltage input to the load by the rail voltage power supply selection module based on a comparison result of the voltage signal and output voltage of the voltage-current conversion module;
the voltage comparison module comprises a Schmitt trigger, a first input end of the Schmitt trigger is connected with a feedback signal end of the voltage-current conversion module, a second input end of the Schmitt trigger is used for acquiring a first reference voltage and a second reference voltage, an output end of the Schmitt trigger is connected with a control end of the rail voltage power supply selection module, and the Schmitt trigger is used for outputting a voltage control signal for controlling the magnitude of the output voltage of the rail voltage power supply selection module through the output end based on a comparison result of the feedback signal, the first reference voltage and the second reference voltage;
the input end of the rail voltage power supply selection module is connected with a power supply voltage, and the output end of the rail voltage power supply selection module is connected with the input end of the voltage-current conversion module and used for outputting rail voltage which changes along with the output voltage of the Schmitt trigger to the voltage-current conversion module.
Optionally, in the analog current output system, the rail voltage power supply selection module includes:
the output end of the first rail voltage power supply branch circuit is connected with the output end of the second rail voltage power supply branch circuit;
the input end of the first rail voltage power supply branch is used for inputting a first voltage, and the first rail voltage power supply branch is used for providing a first rail voltage with a fixed size;
the input end of the second rail voltage power supply branch is used for inputting a second voltage, the control end of the second rail voltage power supply branch is used as the control end of the rail voltage power supply selection module, and the second rail voltage power supply branch is used for providing a second rail voltage which changes along with the output voltage triggered by Schmidt.
Optionally, in the analog current output system, the second rail voltage power supply branch includes:
at least 1 group of buffer modules and voltage selection switches which are mutually connected in series;
the input end of the buffer module is used as the input end of the second rail voltage power supply branch circuit;
and the control end of the voltage selection switch is used as the control end of the rail voltage power supply selection module, the input end of the voltage selection switch is connected with the output end of the buffer module, and the output end of the voltage selection switch is used as the output end of the second rail voltage power supply branch.
Optionally, in the analog current output system, the values of the second voltages connected to each group of the buffer modules and the voltage selection switches connected in series are the same or different.
Optionally, in the analog current output system, the voltage-to-current conversion module is an SIN-type voltage-to-current conversion module, and the SIN-type voltage-to-current conversion module includes:
the circuit comprises a first operational amplifier, a first switch tube and a reference resistor;
a first input end of the first operational amplifier is used as a voltage signal input end, and a second input end of the first operational amplifier is connected with an output end of the first switching tube;
the control end of the first switching tube is connected with the output end of the first operational amplifier, the input end of the first switching tube is connected with the output end of the rail voltage power supply selection module through a load, and the input end of the first switching tube is used as the voltage input end and the feedback signal end of the voltage-current conversion module;
the first end of the reference resistor is connected with the output end of the first switch tube, and the output end of the load is grounded.
Optionally, in the analog quantity current output system, the voltage-to-current conversion module is a SOURCE voltage-to-current conversion module, and the SOURCE voltage-to-current conversion module includes:
the circuit comprises a second operational amplifier, a third operational amplifier, a second switching tube, a first resistor, a load, a third switching tube, a second resistor and a reference resistor;
the first input end of the second operational amplifier is used as a voltage signal input end, the second input end of the second operational amplifier is connected with the output end of the second switching tube, and the output end of the second operational amplifier is connected with the control end of the third switching tube;
the control end of the second switching tube is connected with the output end of the second operational amplifier, the input end of the second switching tube is connected with the input end of the load through the first resistor, and the output end of the second switching tube is grounded through the second resistor;
the first input end of the third operational amplifier is connected with the output end of the load, the second input end of the third operational amplifier is connected with the input end of the second switching tube, and the output end of the second operational amplifier is connected with the control end of the third switching tube;
the input end of the third switch tube is connected with the output end of the rail voltage power supply selection module through the load, the output end of the third switch tube is grounded through the reference resistor, and the output end of the third switch tube is used as a feedback signal end of the voltage-current conversion module.
Optionally, in the analog current output system, the voltage comparison module further includes:
a first reference voltage generation circuit and a second reference voltage generation circuit;
the first reference voltage generating circuit is used for providing a first reference voltage for the Schmitt trigger;
the second reference voltage generation circuit is used for providing a second reference voltage for the Schmitt trigger.
Optionally, in the analog current output system, input ends of the first reference voltage and the second reference voltage are connected to an output end of the schmitt trigger.
Optionally, in the analog current output system, the first reference voltage is smaller than the second reference voltage;
the schmitt trigger is specifically configured to:
when the feedback signal is smaller than the first reference voltage, the Schmitt trigger outputs a control signal for controlling the rail voltage power supply selection module to output a first target voltage; and when the feedback signal is greater than the second reference voltage, the Schmitt trigger outputs a control signal for controlling the rail voltage power supply selection module to output a second target voltage.
Optionally, in the analog current output system, the first reference voltage is greater than the second reference voltage;
the schmitt trigger is specifically configured to:
when the feedback signal is smaller than the first reference voltage, the Schmitt trigger outputs a control signal for controlling the rail voltage power supply selection module to output a first target voltage; and when the feedback signal is greater than the second reference voltage, the Schmitt trigger outputs a control signal for controlling the rail voltage power supply selection module to output a second target voltage.
Based on the technical scheme, the method for controlling the rail voltage power supply selection module to switch the output voltage by the Schmidt output module is adopted to control the input voltage of the voltage regulating tube, so that the analog quantity current output module achieves the design effect of low power consumption, and the circuit scale miniaturization and low cost can be achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an analog current output system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a rail voltage power supply selection module according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an analog current output system according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of an analog current output system according to another embodiment of the present application;
fig. 5 is a schematic structural diagram of an analog current output system according to another embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In view of the above problems, the present application provides a low-cost low-power consumption analog current output system to solve the problem of high internal power consumption of the original current output module, and simultaneously, to achieve lower circuit cost with low power consumption. The invention adopts a Schmidt trigger output module method on the original current output module, controls the switching of the driving power supply by comparing the voltage value of the voltage regulator, and realizes the design effect of low power consumption of the analog quantity current output module. The regulation principle is to use a low voltage power supply to drive when the product of the current and the external load RL is small and a high voltage power supply to drive when the product of the current and the external load RL is large.
Referring to fig. 1, an analog current output system disclosed in an embodiment of the present application may include:
the system comprises a rail voltage power supply selection module 100, a voltage-current conversion module 200 and a voltage comparison module 300;
the input end of the rail voltage power supply selection module 100 is connected to a power supply voltage, the output end of the rail voltage power supply selection module 100 is connected to the input end of the voltage-to-current conversion module 200 directly or through a load, and is configured to output a rail voltage that changes along with the output voltage of the schmitt trigger 301 to the voltage-to-current conversion module 200, in this scheme, the power supply voltage may be a dc voltage or an ac voltage, and the output voltage of the rail voltage power supply selection module 100 is a dc voltage regardless of whether the power supply voltage is a dc voltage or an ac voltage. In this embodiment, the rail voltage power supply selection module 100 may provide a first rail voltage and a second rail voltage, for example, the first rail voltage is 12V, the second rail voltage is 24V, and voltage signals with other amplitudes may also be provided.
In this scheme, the specific structure of the rail voltage power supply selection module 100 may be selected by a user as long as it is ensured that the rail voltage power supply selection module 100 can provide different output voltages along with different control signals output by the voltage comparison module 300, for example, in this scheme, the rail voltage power supply selection module 100 may include a first rail voltage power supply branch and a second rail voltage power supply branch, output ends of the first rail voltage power supply branch and the second rail voltage power supply branch are connected, an input end of the first rail voltage power supply branch is used for inputting a first voltage, and the first rail voltage power supply branch is used for providing a first rail voltage with a fixed size; the input end of the second rail voltage power supply branch is used for inputting a second voltage, the control end of the second rail voltage power supply branch is used as the control end of the rail voltage power supply selection module 100, and the second rail voltage power supply branch is used for providing a second rail voltage which changes along with the output voltage triggered by schmitt. Referring to fig. 2, the first rail voltage power supply branch may include a diode D, an input end of the diode D is connected to a first voltage, an output end of the diode D and an output end of the second rail voltage power supply branch serve as an output end of the rail voltage power supply selection module 100, where the first voltage may be 12V voltage, and the second voltage may be 24V voltage, in this scheme, the second rail voltage power supply branch may include at least 1 set of buffer module and voltage selection switch connected in series, and the buffer module is configured to limit an output current corresponding to the second voltage at an instant when the voltage selection switch is turned on. It can adopt common resistance current-limiting and triode current-limiting. The input end of the buffer module is used as the input end of the second rail voltage power supply branch circuit; the control end of the voltage selection switch is used as the control end of the rail voltage power supply selection module 100, the input end of the voltage selection switch is connected to the output end of the buffer module, the output end of the voltage selection switch is used as the output end of the second rail voltage power supply branch, when the voltage selection switch is closed, the second voltage is connected to the load through the buffer module and the voltage selection switch, when the voltage selection switch is closed, the second voltage cannot be loaded to the load, the on-off state of the voltage selection switch is controlled by the control signal output by the voltage comparison module 300, specifically, when the product of the load and the output current of the voltage-current conversion module 200 is greater than a certain set value, the voltage comparison module 300 is used for outputting a control signal for controlling the voltage selection switch to be closed, and at this time, and driving the current-voltage conversion module by using a second voltage, outputting a control signal for controlling the voltage selection switch to be switched off when the product of the load and the output current of the voltage-current conversion module 200 is smaller than another set value, and driving the current-voltage conversion module by using a first voltage so as to reduce the voltage drop of a voltage adjusting tube in the current-voltage conversion module. In this scheme, the type of the voltage selection switch can be selected by the user according to the user's requirements, for example, it can be a switching device such as a MOS transistor, a triode, a relay, etc.
Referring to fig. 2, when the buffer modules and the voltage selection switches are two or more groups, the second voltages connected to the buffer modules and the voltage selection switches in each group connected in series are the same or different in value, wherein the first voltage value must be smaller than any one of the second voltages, for example, the first voltage value may be 8V, and the second voltage values may be 12V and 24V. The output terminal of the voltage comparison module 300 may be connected to the control terminal of any one or more of the voltage selection switches.
A first input terminal of the voltage-current conversion module 200 receives a control voltage signal, a second input terminal of the voltage-current conversion module 200 is connected to an output terminal of the rail voltage power supply selection module 100 directly or through a load, for controlling the duty ratio of the voltage input to the load by the rail voltage power supply selection module 100 based on the comparison result between the voltage signal and the output voltage of the voltage-to-current conversion module 200, that is, a voltage regulating tube is disposed inside the voltage-current conversion module 200, a first end of the voltage regulating tube is connected to the output end of the rail voltage power supply selection module 100 directly or through a load, the second terminal of the rail voltage power selection module 100 is connected to the input terminal of the load directly or through a voltage regulator of the voltage-to-current conversion module 200, the conducting state of the voltage adjusting tube changes along with the comparison result of the control voltage signal and the voltage of the input end of the load;
the voltage comparison module 300 includes a schmitt trigger 301, and a comparator is built in the schmitt trigger 301, and is configured to obtain a voltage to ground of the adjustment tube and the load in the voltage-to-current module conversion module, and control and drive the switch to be turned on/off by comparing with the first reference voltage or after comparing with the second reference voltage.
The first input terminal IN1 of the schmitt trigger 301 is connected to the feedback signal terminal of the voltage-to-current conversion module 200, the first input terminal of the schmitt trigger 301 collects the voltages to ground of the regulation tube and the load of the voltage-to-current conversion module 200, the second input terminal IN2 of the schmitt trigger 301 is used for obtaining the first reference voltage and the second reference voltage, the output terminal OUT of the schmitt trigger 301 is connected to the control terminal of the rail voltage power selection module 100, which may be referred to as the control terminal of the voltage selection switch, and the schmitt trigger 301 is used for outputting a voltage control signal for controlling the magnitude of the output voltage of the rail voltage power selection module 100 through the output terminal based on the comparison result between the feedback signal and the first reference voltage and the second reference voltage.
The analog quantity current output system provided by the invention solves the problem of high internal power consumption of the original current output module, and has lower cost. According to the invention, the input voltage of the voltage adjusting tube is controlled by adopting the method that the Schmidt output module controls the rail voltage power supply selection module 100 to switch the output voltage, so that the analog quantity current output module realizes the design effect of low power consumption, and the miniaturization and low cost of the circuit scale can be realized.
Referring to fig. 3, the voltage comparison module 300 further includes: a first reference voltage generation circuit 302 and a second reference voltage generation circuit 303; the first reference voltage generating circuit 302 is configured to provide a first reference voltage to the schmitt trigger 301; the second reference voltage generating circuit 303 is configured to provide a second reference voltage to the schmitt trigger 301, where input ends of the first reference voltage and the second reference voltage are connected to an output end of the schmitt trigger 301, and the first reference voltage and the second reference voltage are obtained by converting a voltage signal output by the output end of the schmitt trigger 301.
In the technical solution disclosed in another embodiment of the present application, referring to fig. 4, the voltage-current conversion module 200 may be an SIN-type voltage-current conversion module 200, where the SIN-type voltage-current conversion module 200 includes:
a first operational amplifier U1, a first switch tube M1 (voltage adjusting tube) and a reference resistor Rf;
a first input end of the first operational amplifier U1 is used as a voltage signal input end for inputting a voltage signal, and a second input end of the first operational amplifier U1 is connected with an output end of the first switch tube M1;
a control terminal of the first switch tube M1 is connected to an output terminal of the first operational amplifier U1, an input terminal of the first switch tube M1 is connected to an output terminal of the rail voltage power supply selection module 100 through a load, and an input terminal of the first switch tube M1 serves as a voltage input terminal of the voltage-current conversion module 200;
the input end of the reference resistor Rf load is connected to the output end of the first switch tube M1, and the output end of the load is grounded.
In the technical solution disclosed in another embodiment of the present application, referring to fig. 5, the voltage-current conversion module 200 may be a SOURCE-type voltage-current conversion module 200, where the SOURCE-type voltage-current conversion module 200 includes:
a second operational amplifier U2, a second switch tube M2, a first resistor R1, a second resistor R2R2, a third operational amplifier U3, a third switch tube M3 (voltage adjusting tube) and a reference resistor Rf;
a first input end of the second operational amplifier U2 is used as a voltage signal input end, a second input end of the second operational amplifier U2 is connected with an output end of the second switching tube M2, and an output end of the second operational amplifier U2 is connected with a control end of the third switching tube M3;
a control terminal of the second switching tube M2 is connected to an output terminal of the second operational amplifier U2, an input terminal of the second switching tube M2 is connected to an input terminal of the load through the first resistor R1, and an output terminal of the second switching tube M2 is grounded through the second resistor R2;
a first input end of the third operational amplifier U3U3 is connected to the output end of the load, a second input end of the third operational amplifier U3 is connected to the input end of the second switching tube M2, and an output end of the second operational amplifier U2 is connected to the control end of the third switching tube M3;
the input end of the third switching tube M3 is connected to the output end of the rail voltage power supply selection module 100 through the load, the output end of the third switching tube M3 is grounded through the reference resistor Rf, and the output end of the third switching tube M3 serves as the feedback signal end of the voltage-to-current conversion module 200.
In the technical scheme disclosed in the embodiment of the application, the first reference voltage can be obtained by dividing voltage by a resistor device by adopting a stable power supply, and can also be realized by adopting a reference voltage device. When the voltage-current conversion module 200 is an SIN-type voltage-current conversion module 200, the first reference voltage may be 2V, because if the value is too small, the output of the voltage-current conversion module 200 is affected, and if the value is too large, the control effect of low power consumption is not achieved. In the technical solution disclosed in the embodiment of the present application, if the voltage-to-current conversion module 200 is a SOURCE-type voltage-to-current conversion module 200, it is more appropriate that the first reference voltage is 10V.
The second reference voltage may be obtained by dividing the voltage by a resistor device using a stable power supply, or may be implemented by using a reference voltage device. When the voltage-current conversion module 200 is an SIN-type voltage-current conversion module 200, the second reference voltage is 15V, because if it is too small, the switch will frequently switch states, and if it is too large, the control effect of low power consumption will not be achieved. When the voltage-current conversion module 200 is a SOURCE-type voltage-current conversion module 200, the second reference voltage is preferably 8V.
Specifically, in the technical solution disclosed in the embodiment of the present application, when the voltage-current conversion module 200 is an SIN-type voltage-current conversion module 200, the first reference voltage is smaller than the second reference voltage; at this time, the schmitt trigger 301 is specifically configured to:
when the feedback signal is smaller than the first reference voltage, the schmitt trigger 301 outputs a control signal for controlling the rail voltage power supply selection module 100 to output a first target voltage; when the feedback signal is greater than the second reference voltage, the schmitt trigger 301 outputs a control signal for controlling the rail voltage power supply selection module 100 to output a second target voltage.
When the voltage-current conversion module 200 is a SOURCE-type voltage-current conversion module 200, the first reference voltage is greater than the second reference voltage; at this time, the schmitt trigger 301 is specifically configured to:
when the feedback signal is smaller than the second reference voltage, the schmitt trigger 301 outputs a control signal for controlling the rail voltage power supply selection module 100 to output a first target voltage; when the feedback signal is greater than the first reference voltage, the schmitt trigger 301 outputs a control signal for controlling the rail voltage power supply selection module 100 to output a second target voltage.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An analog current output system, comprising:
the device comprises a rail voltage power supply selection module, a voltage-current conversion module and a voltage comparison module;
a first input end of the voltage-current conversion module receives a control voltage signal, and a second input end of the voltage-current conversion module is connected with an output end of the rail voltage power supply selection module directly or through a load and is used for controlling a duty ratio of voltage input to the load by the rail voltage power supply selection module based on a comparison result of the voltage signal and output voltage of the voltage-current conversion module;
the voltage comparison module comprises a Schmitt trigger, a first input end of the Schmitt trigger is connected with a feedback signal end of the voltage-current conversion module, a second input end of the Schmitt trigger is used for acquiring a first reference voltage and a second reference voltage, an output end of the Schmitt trigger is connected with a control end of the rail voltage power supply selection module, and the Schmitt trigger is used for outputting a voltage control signal for controlling the magnitude of the output voltage of the rail voltage power supply selection module through the output end based on a comparison result of the feedback signal, the first reference voltage and the second reference voltage;
the input end of the rail voltage power supply selection module is connected with a power supply voltage, and the output end of the rail voltage power supply selection module is connected with the input end of the voltage-current conversion module and used for outputting rail voltage which changes along with the output voltage of the Schmitt trigger to the voltage-current conversion module.
2. The analog current output system of claim 1, wherein the rail voltage power supply selection module comprises:
the output end of the first rail voltage power supply branch circuit is connected with the output end of the second rail voltage power supply branch circuit;
the input end of the first rail voltage power supply branch is used for inputting a first voltage, and the first rail voltage power supply branch is used for providing a first rail voltage with a fixed size;
the input end of the second rail voltage power supply branch is used for inputting a second voltage, the control end of the second rail voltage power supply branch is used as the control end of the rail voltage power supply selection module, and the second rail voltage power supply branch is used for providing a second rail voltage which changes along with the output voltage triggered by Schmidt.
3. The analog current output system of claim 2, wherein the second rail voltage power supply branch comprises:
at least 1 group of buffer modules and voltage selection switches which are mutually connected in series;
the input end of the buffer module is used as the input end of the second rail voltage power supply branch circuit;
and the control end of the voltage selection switch is used as the control end of the rail voltage power supply selection module, the input end of the voltage selection switch is connected with the output end of the buffer module, and the output end of the voltage selection switch is used as the output end of the second rail voltage power supply branch.
4. The analog current output system of claim 3, wherein the values of the second voltages connected by each set of the buffer modules and the voltage selection switches connected in series are the same or different.
5. The analog current output system of claim 1, wherein the voltage-to-current conversion module is an SIN-type voltage-to-current conversion module, the SIN-type voltage-to-current conversion module comprising:
the circuit comprises a first operational amplifier, a first switch tube and a reference resistor;
a first input end of the first operational amplifier is used as a voltage signal input end, and a second input end of the first operational amplifier is connected with an output end of the first switching tube;
the control end of the first switching tube is connected with the output end of the first operational amplifier, the input end of the first switching tube is connected with the output end of the rail voltage power supply selection module through a load, and the input end of the first switching tube is used as the voltage input end and the feedback signal end of the voltage-current conversion module;
the first end of the reference resistor is connected with the output end of the first switch tube, and the output end of the load is grounded.
6. The analog-to-current output system of claim 5, wherein said voltage-to-current conversion module is a SOURCE-type voltage-to-current conversion module, said SOURCE-type voltage-to-current conversion module comprising:
the circuit comprises a second operational amplifier, a third operational amplifier, a second switching tube, a first resistor, a load, a third switching tube, a second resistor and a reference resistor;
the first input end of the second operational amplifier is used as a voltage signal input end, the second input end of the second operational amplifier is connected with the output end of the second switching tube, and the output end of the second operational amplifier is connected with the control end of the third switching tube;
the control end of the second switching tube is connected with the output end of the second operational amplifier, the input end of the second switching tube is connected with the input end of the load through the first resistor, and the output end of the second switching tube is grounded through the second resistor;
the first input end of the third operational amplifier is connected with the output end of the load, the second input end of the third operational amplifier is connected with the input end of the second switching tube, and the output end of the second operational amplifier is connected with the control end of the third switching tube;
the input end of the third switch tube is connected with the output end of the rail voltage power supply selection module through the load, the output end of the third switch tube is grounded through the reference resistor, and the output end of the third switch tube is used as a feedback signal end of the voltage-current conversion module.
7. The analog current output system of claim 5, wherein the voltage comparison module further comprises:
a first reference voltage generation circuit and a second reference voltage generation circuit;
the first reference voltage generating circuit is used for providing a first reference voltage for the Schmitt trigger;
the second reference voltage generation circuit is used for providing a second reference voltage for the Schmitt trigger.
8. The analog current output system of claim 7, wherein the input terminals of the first reference voltage and the second reference voltage are connected to the output terminal of the schmitt trigger.
9. The analog current output system of claim 5, wherein the first reference voltage is less than the second reference voltage;
the schmitt trigger is specifically configured to:
when the feedback signal is smaller than the first reference voltage, the Schmitt trigger outputs a control signal for controlling the rail voltage power supply selection module to output a first target voltage; and when the feedback signal is greater than the second reference voltage, the Schmitt trigger outputs a control signal for controlling the rail voltage power supply selection module to output a second target voltage.
10. The analog current output system of claim 6, wherein the first reference voltage is greater than the second reference voltage;
the schmitt trigger is specifically configured to:
when the feedback signal is smaller than the first reference voltage, the Schmitt trigger outputs a control signal for controlling the rail voltage power supply selection module to output a first target voltage; and when the feedback signal is greater than the second reference voltage, the Schmitt trigger outputs a control signal for controlling the rail voltage power supply selection module to output a second target voltage.
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