CN112162516A - Analog output compatible circuit, load control circuit and refrigeration equipment - Google Patents

Analog output compatible circuit, load control circuit and refrigeration equipment Download PDF

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Publication number
CN112162516A
CN112162516A CN202011086863.7A CN202011086863A CN112162516A CN 112162516 A CN112162516 A CN 112162516A CN 202011086863 A CN202011086863 A CN 202011086863A CN 112162516 A CN112162516 A CN 112162516A
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China
Prior art keywords
circuit
analog
analog quantity
output
signal type
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CN202011086863.7A
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Chinese (zh)
Inventor
沈丽凤
钱沛
胡江
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202011086863.7A priority Critical patent/CN112162516A/en
Publication of CN112162516A publication Critical patent/CN112162516A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
    • H03K17/693—Switching arrangements with several input- or output-terminals, e.g. multiplexers, distributors
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/24—Pc safety
    • G05B2219/24215—Scada supervisory control and data acquisition

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Amplifiers (AREA)

Abstract

The invention provides an analog output compatible circuit, a load control circuit and refrigeration equipment, wherein the analog output compatible circuit comprises: a control loop for outputting a pulse width modulated PWM wave of a target signal type; an analog quantity generation circuit for generating an analog quantity of the target signal type; and the analog quantity selection circuit is connected between the control loop and the analog quantity generation circuit and is used for communicating the analog quantity output channel of the target signal type by adopting a switch circuit. The invention solves the technical problem that the analog output circuit in the related technology can only output a single analog signal, simplifies the complexity of the analog output circuit, reduces the internal control resources of the main chip, improves the universality of the analog output circuit and improves the integration level of the control circuit.

Description

Analog output compatible circuit, load control circuit and refrigeration equipment
Technical Field
The invention relates to the field of circuits, in particular to an analog output compatible circuit, a load control circuit and refrigeration equipment.
Background
In the related art, with the wide application of the sensing technology in the industries of rail transit, aerospace, domestic electrical appliances and the like, the sensing technology has become an important branch of modern science and technology. In the field of commercial air conditioners and the like, analog quantity signals are generally used for detecting various sensor signals and controlling loads of units, wherein analog quantity output signals are generally used for controlling the loads of refrigerating units, and analog quantity input signals are used for detecting signals such as load feedback. The analog output signal is an indispensable control mode in the use process of the refrigeration equipment, and is usually used for driving various valve bodies, motors and sensors. Especially, under complex and various control environments, the high-efficiency and multifunctional analog output signal is the most important of the unit.
In the related art, analog signals include a plurality of signal types, which need to be generated and output by independent analog signal generators, and the analog signals of the plurality of types are incompatible, so that the circuit is complicated, a plurality of generators need to be arranged, and the circuit integration level is affected.
In view of the above problems in the related art, no effective solution has been found at present.
Disclosure of Invention
The embodiment of the invention provides an analog output compatible circuit, a load control circuit and refrigeration equipment, and aims to solve the technical problem that an analog output circuit in the related art can only output a single analog signal.
According to an embodiment of the present invention, there is provided an analog output compatible circuit including: the differential circuit is used for acquiring differential signals; the communication circuit comprises a first communication sub-circuit and a second communication sub-circuit and is used for transmitting signals in a preset communication mode when the differential signals meet preset conditions; and the reverse circuit is connected with the communication circuit and is used for reversing the level signal of the first communication sub-circuit or the second communication sub-circuit.
Optionally, the control loop includes: the determining unit is used for determining the type of a target signal of the analog quantity to be output; the generating unit is connected with the determining unit and used for generating corresponding PWM waves according to the types of the target signals; and the control unit is used for controlling the switching state of the analog quantity selection circuit according to the PWM wave.
Optionally, the generating unit is further configured to: and when the target signal type is a voltage signal, outputting a PWM wave with a first duty ratio, and when the target signal type is a current signal, outputting a PWM wave with a second duty ratio.
Optionally, the first duty ratio ranges from 0 to 100%, and the first duty ratio ranges from 10% to 100%.
Optionally, the selection circuit includes: the first switch is connected between the control loop and the analog quantity generating circuit and used for selecting the control loop to be communicated with the first analog circuit or the second analog circuit, wherein the analog quantity generating circuit comprises the first analog circuit and the second analog circuit; and the second switch is connected between the analog quantity generating circuit and the target load and used for selectively outputting the analog quantity of the first signal type or the analog quantity of the second signal type to the target load.
Optionally, the analog quantity generating circuit includes: the first analog circuit consists of an RC filter circuit and an in-phase amplification operational amplifier circuit and is used for generating analog quantity of a first signal type; and the second analog circuit consists of an RC filter circuit, a follower circuit, an operational amplifier circuit and a voltage following feedback circuit and is used for generating analog quantity of a second signal type.
Optionally, the first signal type is a voltage signal, and the second signal type is a current signal.
Optionally, the analog quantity range of the voltage signal is 0 to 10V, and the analog quantity range of the current signal is 4mA to 20 mA.
There is also provided, in accordance with an embodiment of the present invention, a load control circuit, including: the control circuit comprises the analog quantity output compatible circuit and is used for controlling the load circuit by using the analog quantity output compatible circuit; the load circuit is connected with the control circuit.
There is also provided, in accordance with an embodiment of the present invention, refrigeration apparatus, including: the control circuit comprises the analog quantity output compatible circuit and is used for controlling the driving circuit by using the analog quantity output compatible circuit; the driving circuit is connected with the control circuit.
According to the invention, the control loop outputs the pulse width modulation PWM wave of the target signal type; the analog quantity generating circuit generates the analog quantity of the target signal type, the analog quantity selecting circuit adopts the switch circuit to be communicated with the analog quantity output channel of the target signal type, and the PWM wave of the corresponding signal type is output in the control loop, so that the compatible circuit capable of selecting the analog quantity output signal is provided, the technical problem that the analog quantity output circuit in the related technology can only output a single analog signal is solved, the complexity of the analog quantity output circuit is simplified, the internal control resource of a main chip is reduced, the universality of the analog quantity output circuit is improved, and the integration level of the control circuit is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a block diagram of an analog output compatible circuit according to an embodiment of the present invention;
FIG. 2 is a logic block diagram of an analog output compatible circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an analog output compatible circuit according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Example 1
In this embodiment, an analog output compatible circuit is provided, and fig. 1 is a structural diagram of an analog output compatible circuit according to an embodiment of the present invention, as shown in fig. 1, including:
a control circuit 10 for outputting a Pulse Width Modulation (PWM) wave of a target signal type;
the Pulse Width Modulation (PWM) wave of the present embodiment is a control signal, and different signal types correspond to different PWM waves.
An analog quantity generation circuit 12 for generating an analog quantity of the target signal type;
the analog quantity of the present embodiment refers to the magnitude, number, etc. of the analog signal, such as the magnitude of voltage, the magnitude of current, the magnitude of power, etc.
And the analog quantity selection circuit 14 is connected between the control loop and the analog quantity generation circuit and is used for communicating an analog quantity output channel of the target signal type by adopting a switch circuit.
In the analog output compatible circuit, analog signals of various signal types can be selectively output, and each signal type analog signal corresponds to one analog output channel.
Through the circuit, the control loop outputs a Pulse Width Modulation (PWM) wave of a target signal type; the analog quantity generating circuit generates the analog quantity of the target signal type, the analog quantity selecting circuit adopts the switch circuit to be communicated with the analog quantity output channel of the target signal type, a compatible circuit capable of selecting analog quantity output signals is provided, the technical problem that the analog quantity output circuit in the related technology can only output a single analog signal is solved, the complexity of the analog quantity output circuit is simplified, the internal control resources of a main chip are reduced, the universality of the analog quantity output circuit is improved, and the integration level of the control circuit is improved.
The control circuit 10, the analog quantity generating circuit 12, and the analog quantity selecting circuit 14 may be implemented by any combination circuit, integrated circuit, or microprocessor that can implement the above-described functions. In order to make the description of the embodiments of the present invention clearer, the embodiments of the present invention will be described and illustrated below with reference to preferred embodiments.
In one embodiment of this embodiment, the control loop comprises: the determining unit is used for determining the type of a target signal of the analog quantity to be output; the generating unit is connected with the determining unit and used for generating corresponding PWM waves according to the types of the target signals; and the control unit is used for controlling the switching state of the analog quantity selection circuit according to the PWM wave.
Optionally, the generating unit is further configured to: and when the target signal type is a voltage signal, outputting a PWM wave with a first duty ratio, and when the target signal type is a current signal, outputting a PWM wave with a second duty ratio.
In one example, the first duty cycle ranges from 0 to 100% and the first duty cycle ranges from 10% to 100%. The voltage signal and the current signal can be distinguished by parameters such as wavelength, period, frequency and the like in addition to the duty ratio, and of course, the analog signal can be other analog signals besides the voltage signal and the current signal, such as power and the like.
In one implementation of this embodiment, the selection circuit includes: the first switch is connected between the control loop and the analog quantity generating circuit and used for selecting the control loop to be communicated with the first analog circuit or the second analog circuit, wherein the analog quantity generating circuit comprises the first analog circuit and the second analog circuit; and the second switch is connected between the analog quantity generating circuit and the target load and used for selectively outputting the analog quantity of the first signal type or the analog quantity of the second signal type to the target load.
Optionally, the first switch and the second switch may be dial switches, and of course, may also be other types of switches.
Optionally, the analog quantity generating circuit includes: the first analog circuit consists of an RC filter circuit and an in-phase amplification operational amplifier circuit and is used for generating analog quantity of a first signal type; and the second analog circuit consists of an RC filter circuit, a follower circuit, an operational amplifier circuit and a voltage following feedback circuit and is used for generating analog quantity of a second signal type. Wherein the first signal type is a voltage signal and the second signal type is a current signal.
Instead of using a specific analog circuit to generate the analog quantity, it is also possible to directly derive it from the power supply (voltage source, current source, etc.). Optionally, the analog quantity range of the voltage signal is 0 to 10V, and the analog quantity range of the current signal is 4mA to 20 mA. By generating an analog signal of a specific analog quantity, a corresponding control signal can be output to control the load to execute a corresponding operation.
Fig. 2 is a logic block diagram of an analog output compatible circuit according to an embodiment of the present invention, where the analog output compatible circuit is composed of a control loop, an analog selection circuit, and an analog generation circuit (corresponding to the analog generation circuit in the above-described embodiment). The analog quantity generating circuit is used for generating required voltage output or current output.
The input/output compatible analog quantity output control circuit provided by the embodiment can be used for sensor driving and the like of a refrigeration device. The circuit is compatible with an output port and a control loop; the complexity of the analog output circuit is simplified, the internal control resources of the main chip are reduced, and the universality of the analog output circuit is improved.
FIG. 3 is a schematic diagram of an analog output compatible circuit according to an embodiment of the present invention, which includes two analog signal output circuits for outputting 4-20 mA current and 0-10V voltage. The input of the 4-20 mA current output circuit is PWM waves with duty ratio of 10% -100%, the input of the 0-10V voltage output circuit is PWM waves with duty ratio of 0-100%, S1 in the figure 3 is used for selecting different analog quantity output circuits, S2 is used for selecting corresponding circuit signals, S1 and S2 need to be in one-to-one correspondence, namely when the 4-20 mA circuit is selected, Iout is selected to be output at the same time. A voltage follower can be added in the 4-20 mA circuit of FIG. 3, other circuits are not changed, and the voltage follower provides input signal compatible conversion for 4-20 mA output and provides impedance matching of the circuit.
The analog quantity output compatible circuit can selectively output a 0-10V voltage signal or 4-20 mA current; the control loop of the analog output circuit is compatible with the same control mode, and the input stage adopts PWM wave output control; the control loop of the analog output circuit is compatible with the same control mode, and the input stage adopts PWM wave output control, wherein the PWM signal of the 0-10V analog output circuit is the PWM wave with the duty ratio of 0-100%, and the PWM signal of the 4-20 mA analog output circuit is the PWM wave with the duty ratio of 10-100%. The 0-10V analog quantity generating circuit consists of a 2-level operational amplifier circuit, and the 4-20 mA analog quantity generating circuit consists of a filter circuit and a 1-level operational amplifier circuit; in another example, the 0-10V analog quantity output circuit consists of an RC filter circuit and an in-phase amplification operational amplifier circuit, and the 4-20 mA analog quantity output circuit consists of an RC filter circuit, a follower circuit, an operational amplifier circuit and a voltage following feedback circuit; the dial circuit is used for controlling the selection of the output mode, the same dial circuit has opposite characteristics, and different dial circuits keep the same network selection characteristic.
Based on the above fig. 2, the main chip outputs the PWM signal to the level 1 dial circuit, the level 1 dial circuit inputs the PWM control signal to the analog quantity generating circuit, the analog quantity generating circuit inputs the output analog signal to the level 2 dial circuit, and the level 2 dial circuit determines to output the analog signal. The control mode is as follows: when a 0-10V analog output circuit is adopted, the main chip controls to generate 0-100% PWM waveforms, and two stages of dial circuits are synchronously selected to be 1 channel; when a 4-20 mA analog quantity output circuit is adopted, the main chip controls to generate 10-100% of PWM waveforms, and the two stages of dial circuits are synchronously selected to 2 channels. When different analog quantities are output, the corresponding input signals are PWM signals, but the difference is that 0-10V analog quantity output signals correspond to PWM waveforms with 0-100% duty ratio; the 4-20 mA analog output signal corresponds to a PWM waveform with a duty ratio of 10-100%, and only the control loops of the main chip are needed to be distinguished.
In this embodiment, an output method of an analog output is provided, where the process includes the following steps:
step S402, determining the type of a target signal of analog quantity to be output;
step S404, generating a corresponding PWM wave according to the target signal type;
and step S406, controlling the switch state of the analog quantity selection circuit according to the PWM wave.
When a 0-10V analog output circuit is adopted, the main chip controls to generate 0-100% PWM waveforms, and two stages of dial circuits are synchronously selected to a first channel; when a 4-20 mA analog quantity output circuit is adopted, the main chip controls to generate 10-100% of PWM waveforms, and the two dial circuits are synchronously selected to a second channel.
The output method of the analog quantity output and the selectable analog quantity output compatible circuit provided by the embodiment can be used for driving a sensor of a refrigerating device and the like. The circuit is compatible with the output port and the control loop, simplifies the complexity of the analog output circuit, reduces the internal control resources of the main chip and improves the universality of the analog output circuit.
Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
Example 2
Embodiments of the present invention also provide a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the above method embodiments when executed.
Alternatively, in an aspect of the present embodiment, the storage medium may be configured to store a computer program for executing the steps of:
s1, determining the type of the target signal of the analog quantity to be output;
s2, generating a corresponding PWM wave according to the target signal type;
and S3, controlling the switch state of the analog quantity selection circuit according to the PWM wave.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Embodiments of the present invention also provide an electronic device comprising a memory having a computer program stored therein and a processor arranged to run the computer program to perform the steps of any of the above method embodiments.
Optionally, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.
Optionally, in an aspect of this embodiment, the processor may be configured to execute the following steps by a computer program:
s1, determining the type of the target signal of the analog quantity to be output;
s2, generating a corresponding PWM wave according to the target signal type;
and S3, controlling the switch state of the analog quantity selection circuit according to the PWM wave.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An analog output compatible circuit, comprising:
a control loop for outputting a pulse width modulated PWM wave of a target signal type;
an analog quantity generation circuit for generating an analog quantity of the target signal type;
and the analog quantity selection circuit is connected between the control loop and the analog quantity generation circuit and is used for communicating the analog quantity output channel of the target signal type by adopting a switch circuit.
2. The circuit of claim 1, wherein the control loop comprises:
the determining unit is used for determining the type of a target signal of the analog quantity to be output;
the generating unit is connected with the determining unit and used for generating corresponding PWM waves according to the types of the target signals;
and the control unit is used for controlling the switching state of the analog quantity selection circuit according to the PWM wave.
3. The circuit of claim 2, wherein the generation unit is further configured to: and when the target signal type is a voltage signal, outputting a PWM wave with a first duty ratio, and when the target signal type is a current signal, outputting a PWM wave with a second duty ratio.
4. The circuit of claim 3, wherein the first duty cycle ranges from 0 to 100% and the first duty cycle ranges from 10% to 100%.
5. The circuit of claim 1, wherein the selection circuit comprises:
the first switch is connected between the control loop and the analog quantity generating circuit and used for selecting the control loop to be communicated with the first analog circuit or the second analog circuit, wherein the analog quantity generating circuit comprises the first analog circuit and the second analog circuit;
and the second switch is connected between the analog quantity generating circuit and the target load and used for selectively outputting the analog quantity of the first signal type or the analog quantity of the second signal type to the target load.
6. The circuit of claim 1, wherein the analog quantity generation circuit comprises:
the first analog circuit consists of an RC filter circuit and an in-phase amplification operational amplifier circuit and is used for generating analog quantity of a first signal type;
and the second analog circuit consists of an RC filter circuit, a follower circuit, an operational amplifier circuit and a voltage following feedback circuit and is used for generating analog quantity of a second signal type.
7. The circuit of claim 6, wherein the first signal type is a voltage signal and the second signal type is a current signal.
8. The circuit of claim 7, wherein the analog magnitude of the voltage signal ranges from 0 to 10V and the analog magnitude of the current signal ranges from 4mA to 20 mA.
9. A load control circuit, comprising:
a control circuit including the analog quantity output compatible circuit according to any one of claims 1 to 8, for controlling a load circuit using the analog quantity;
the load circuit is connected with the control circuit.
10. A refrigeration apparatus, comprising:
a control circuit including the analog quantity output compatible circuit according to any one of claims 1 to 8 for controlling the drive circuit using the analog quantity;
the driving circuit is connected with the control circuit.
CN202011086863.7A 2020-10-12 2020-10-12 Analog output compatible circuit, load control circuit and refrigeration equipment Pending CN112162516A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011086863.7A CN112162516A (en) 2020-10-12 2020-10-12 Analog output compatible circuit, load control circuit and refrigeration equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011086863.7A CN112162516A (en) 2020-10-12 2020-10-12 Analog output compatible circuit, load control circuit and refrigeration equipment

Publications (1)

Publication Number Publication Date
CN112162516A true CN112162516A (en) 2021-01-01

Family

ID=73868186

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011086863.7A Pending CN112162516A (en) 2020-10-12 2020-10-12 Analog output compatible circuit, load control circuit and refrigeration equipment

Country Status (1)

Country Link
CN (1) CN112162516A (en)

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