CN109946537B - Electronic expansion valve analog circuit - Google Patents
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Abstract
The invention provides an electronic expansion valve analog circuit. The circuit comprises: a driving circuit, an analog circuit and a processing unit; the driving circuit is connected with the processing unit and is used for driving the analog circuit according to a control instruction sent by the processing unit, and the control instruction is used for indicating the target working state of the analog circuit; the analog circuit is connected with the driving circuit and is used for simulating the electronic expansion valve and outputting feedback information to the processing unit; the processing unit obtains the actual working state of the analog circuit according to the feedback information, and generates a control instruction according to the actual working state; wherein, the working state comprises a rotation mode and a rotation step number. According to the invention, by designing the analog circuit, various types of electronic expansion valves can be replaced, and developers and designers can use the analog circuit to simulate the load of the electronic expansion valve, so that the debugging time is greatly saved, and the testing efficiency is improved.
Description
Technical Field
The invention relates to the technical field of electronic expansion valve testing, in particular to an electronic expansion valve analog circuit.
Background
Electronic expansion valves, which are an important conventional throttling element, can control the liquid supply amount of an evaporator and throttle saturated liquid refrigerant, are widely used in air conditioning, refrigeration and low-temperature refrigeration systems. The flow rate of the electronic expansion valve under different opening degrees is an important characteristic of the electronic expansion valve, and is directly related to the quality of the refrigeration system. Taking air conditioning as an example, the cold water type air conditioning unit has the advantages of high efficiency, energy saving, environmental protection, flexible combination, convenient installation and the like, is growing in market share, and is widely applied to places such as government public building, urban complex, industrial production, rail transit, hotel industry, business office and the like. As shown in fig. 11, the refrigeration system is composed of an evaporator, a compressor, a condenser and an expansion valve. In an air conditioning system, an electronic expansion valve generally controls the flow of refrigerant to the system. The regulation and control of the refrigerant flow are important components for realizing the circulation operation of an air conditioning system and the heat exchange of an internal system, so that the control of the refrigerant flow is important. An electronic expansion valve in a cold water type air conditioning unit plays a role of throttling so as to control the flow of a refrigerant of the system. The electronic expansion valve utilizes the electric signal generated by the adjusted parameters to control the voltage or current applied to the expansion valve, thereby achieving the purpose of adjusting the liquid supply amount.
The testing of the electronic expansion valve is very important. While the types of electronic expansion valves are various, in order to facilitate development and testing of various types of electronic expansion valves by a tester, a device or circuit capable of simulating various electronic expansion valves is needed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the electronic expansion valve simulation circuit, which can replace various types of electronic expansion valves by designing the simulation circuit, and a developer can be used for simulating the load of the electronic expansion valve, so that the debugging time is greatly saved, and the testing efficiency is improved.
The invention provides an electronic expansion valve analog circuit, which comprises: a driving circuit, an analog circuit and a processing unit; wherein,
the driving circuit is connected with the processing unit and is used for driving the analog circuit according to a control instruction sent by the processing unit, and the control instruction is used for indicating the target working state of the analog circuit;
the analog circuit is connected with the driving circuit and is used for simulating the electronic expansion valve and outputting feedback information to the processing unit;
the processing unit obtains the actual working state of the analog circuit according to the feedback information, and generates a control instruction according to the actual working state;
wherein, the working state comprises a rotation mode and a rotation step number.
Further, the circuit also comprises a filter circuit, wherein the filter circuit is connected with the analog circuit, and the filter circuit comprises a voltage dividing resistor.
Further, the analog circuit comprises at least 4 groups of analog sub-circuits with the same structure, and the analog sub-circuits comprise a light emitting diode, a triode, a first resistor, a second resistor and a third resistor; the cathode of the light emitting diode is connected with the driving circuit, the anode of the light emitting diode is connected with one end of the first resistor, and the other end of the first resistor is connected to a first power supply through the second resistor; the connecting point of the first resistor and the second resistor is connected with the base electrode of the triode, the emitting electrode of the triode is connected with one end of the third resistor, the collecting electrode of the triode is connected with the second power supply, and the other end of the third resistor is connected with the filter circuit.
Further, a voltage dividing circuit is connected between the processing unit and the analog circuit, the voltage dividing circuit comprises a current limiting resistor, a filter capacitor and a clamping diode, one end of the current limiting resistor is connected with the analog circuit, and the other end of the current limiting resistor is connected with the filter capacitor and then connected with the anode of the clamping diode in series and the processing unit.
Further, the processing unit determines the actual working state of the analog circuit according to the feedback information, the voltage at the other end of the current limiting resistor corresponding to the feedback information, and the preset mapping relation between the voltage and the working state.
Further, the processing unit comprises an upper computer and a lower computer, and the upper computer is in communication connection with the lower computer.
The invention has the beneficial effects that:
the driving circuit in the analog circuit can realize the action of the electronic expansion valve, and the analog circuit is used for simulating the load and step number detection of the electronic expansion valve. The processing unit sends a control instruction carrying a target step number to the driving circuit, simulates the actual step number of the electronic expansion valve through the simulation circuit, and transmits the actual step number to the processing unit. The processing unit compares and displays the target step number with the actual step number, and the comparison result is clear at a glance. The analog circuit provided by the invention is mainly used for a developer to simulate the load of the electronic expansion valve, so that the debugging time is greatly saved, and the testing efficiency is improved.
Drawings
FIG. 1 is a schematic block diagram of an analog circuit of an electronic expansion valve according to an embodiment of the present invention;
FIG. 2 is a second schematic circuit diagram of an analog circuit of an electronic expansion valve according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an analog circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a simplified part of a circuit of an electronic expansion valve analog circuit in a two-phase excitation working state according to an embodiment of the present invention;
FIG. 5 is a third schematic block diagram of an analog circuit of an electronic expansion valve according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an analog circuit of an electronic expansion valve according to an embodiment of the present invention;
fig. 7 is a schematic block diagram of an analog circuit of an electronic expansion valve according to an embodiment of the present invention.
Fig. 8 is a schematic circuit diagram of an electronic expansion valve analog circuit according to an embodiment of the present invention;
fig. 9 is a schematic circuit diagram of a driving circuit according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of the operation of a prior art driven electronic expansion valve;
fig. 11 is a schematic structural diagram of a refrigeration system according to the prior art.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 10 is a schematic diagram of the operation of the conventional control of the present driving electronic expansion valve. In fig. 10, a driving chip ULN2003 is connected to an actual electronic expansion valve real object through a connector, and a four-phase eight-beat stepper motor is arranged inside the electronic expansion valve. When the 16 th pin of the output end of the ULN2003 is in a high resistance state, the VCC1 is loaded to the 16 th pin of the ULN2003 through the a-phase L1 coil, and the loop is in a non-conductive state, namely, the loop indicates that the a-phase of the electronic expansion valve is not working; when the 16 th pin of the output end of the ULN2003 is in a low level state, VCC1 is loaded to the 16 th pin of the ULN2003 through the a-phase L1 coil, and the loop is in a conducting state, which means that the electronic expansion valve operates in a phase. The working principle of B, C, D phase of the electronic expansion valve can be known in the same way, and the description is omitted here.
The invention aims to provide an electronic expansion valve simulation circuit which can simulate the actual working state of an electronic expansion valve, and transmit the actual driving steps, valve opening or valve closing states to a processing unit, so that synchronous driving and detection display is realized, debugging and verification work by development designers is facilitated, the circuit can simulate different types of electronic expansion valves, the time for the development designers to search various electronic expansion valve objects in the market is saved, and the working efficiency is improved.
Fig. 1 is a schematic circuit block diagram of an analog circuit of an electronic expansion valve according to an embodiment of the present invention. As shown in fig. 1, the circuit includes: a driving circuit 101, an analog circuit 102, and a processing unit 103; wherein:
the driving circuit 101 is connected with the processing unit 103, and is configured to drive the analog circuit 102 according to a control instruction sent by the processing unit 103, where the control instruction is used to indicate a target working state of the analog circuit 102; the analog circuit 102 is connected with the driving circuit 101, and is used for simulating an electronic expansion valve and outputting feedback information to the processing unit 103; the processing unit 103 obtains the actual working state of the analog circuit 102 according to the feedback information, and generates a control instruction according to the actual working state; wherein, the working state comprises a rotation mode and a rotation step number.
Fig. 2 is a second schematic circuit block diagram of an analog circuit of an electronic expansion valve according to an embodiment of the present invention. As shown in fig. 2, the circuit includes: a driving circuit 101, an analog circuit 102, a processing unit 103, and a filter circuit 104. Referring to fig. 8, one end of the filter circuit 104 is connected to the analog circuit 102, and the other end is connected to a third power supply; the filter circuit 104 includes a voltage dividing resistor R14. In this embodiment, the third power supply is the power ground GND.
Fig. 3 is a schematic circuit diagram of an analog circuit according to an embodiment of the present invention. As shown in fig. 3 and 8, the analog circuit 102 includes 4 groups of analog sub-circuits with the same structure, i.e., an a-phase analog circuit, a B-phase analog circuit, a C-phase analog circuit, and a D-phase analog circuit. Taking an A-phase analog circuit as an example, the analog sub-circuit comprises a light emitting diode LED1, a triode N1, a first resistor R1, a second resistor R2 and a third resistor R3; the cathode of the light emitting diode (LED 1) is connected with the driving circuit (101), the anode is connected with one end of the first resistor (R1), and the other end of the first resistor (R1) is connected to a first power supply (VCC 1) through the second resistor (R2); the connection point of the first resistor R1 and the second resistor R2 is connected to the base electrode of the triode N1, the emitter electrode of the triode N1 is connected to one end of the third resistor R3, the collector electrode is connected to the second power supply VCC2, and the other end of the third resistor R3 is connected to the filter circuit 105. Wherein, the value range of the second power supply VCC2 is 3-5V.
Similarly, the B-phase analog circuit includes a light emitting diode LED2, a triode N2, a first resistor R4, a second resistor R5, and a third resistor R6; the C-phase analog circuit comprises a light emitting diode LED3, a triode N3, a first resistor R7, a second resistor R8 and a third resistor R9; the D-phase analog circuit comprises a light emitting diode LED4, a triode N4, a first resistor R11, a second resistor R12 and a third resistor R13.
The function of each circuit element in the embodiment of the invention is as follows: LEDs 1-4 are diode lamps used to indicate the on state of each phase of analog subcircuit. The LED lamp is lighted to indicate that the analog sub-circuit where the LED lamp is positioned is conducted, namely the phase analog sub-circuit is in an excitation state. R1-R3 are divider resistors of the A-phase analog subcircuit; R4-R6 are the voltage dividing resistors of the B-phase analog subcircuit; R7-R9 are the voltage dividing resistors of the C-phase analog subcircuit; R11-R13 are the voltage dividing resistors of the D-phase analog subcircuit; r14 is a common divider resistor of the analog circuit; r10 is MCU side current limiting resistor, prevents the current and exceeds the rated current that singlechip single-way pin allowed. C1 is a filter capacitor, and forms an RC filter circuit with the front equivalent resistor to filter interference signals existing in the voltage signals.
As shown in fig. 1 to 4, the analog circuit can be divided into two operating cases of single-phase excitation and multi-phase excitation.
Taking an A-phase analog sub-circuit as an example, the working principle of the analog circuit during single-phase excitation is as follows:
(1) When the A-phase analog sub-circuit detects a low-level signal, a first power supply VCC1 forms a conduction loop through an R2 resistor, an R1 resistor and an LED1 display lamp to a first pin of the CN2 connector. The R1 resistor is a voltage dividing resistor, and a potential difference exists at the connection point of the R1 resistor and the R2 resistor, and the potential difference acts on the base electrode of the triode N1 to conduct the triode N1. When the triode N1 is conducted, the second power supply VCC2 is connected to the resistor R3 through the collector and the emitter of the triode, and then the resistor R14 is connected with GND in series to form a conducting loop. The voltage value of the connection part of the R14 resistor and the R10 can be detected through the resistor R10, the voltage value is acquired through the data acquisition port 1 by the singlechip 2, the voltage value is subjected to analog-to-digital conversion by utilizing an internal integrated analog-to-digital converter, and then the singlechip 2 sends the converted value to an upper computer, namely a PC monitoring end.
(2) When the A-phase analog sub-circuit detects a high-level signal, a loop cannot be formed from the first power supply VCC1 to the first pin of the CN2 connector through the R2 resistor, the R1 resistor and the LED1 display lamp, namely, the A-phase analog sub-circuit cannot work at the moment, and no potential difference exists at the connection point of the R1 resistor and the R2 resistor, so that the connection point cannot reach the conducting voltage of the triode N1, and the triode N1 cannot be conducted at the moment. The singlechip 2 detects that the R14 resistance end is in a low level state through the R10 resistance, the singlechip 2 data acquisition port 1 acquires a voltage value at the joint of the R14 resistance and the R10, the voltage value is subjected to analog-to-digital conversion by utilizing an internal integrated analog-to-digital converter, and then the singlechip 2 sends the converted value to an upper computer, namely a PC monitoring end.
Similarly, the working principles of the B-phase analog sub-circuit, the C-phase analog sub-circuit and the D-phase analog sub-circuit are similar, and are not repeated here.
Taking simultaneous excitation of A-phase and B-phase analog sub-circuits as an example, the working principle of the analog circuit during multiphase excitation is as follows:
when the A-phase analog sub-circuit detects a low-level signal, a first power supply VCC1 forms a conduction loop through an R2 resistor, an R1 resistor and an LED1 display lamp to a first pin of the CN2 connector. The R1 resistor is a voltage dividing resistor, and a potential difference exists at the connection point of the R1 resistor and the R2 resistor, and the potential difference acts on the base electrode of the triode N1 to conduct the triode N1. When the triode N1 is conducted, the second power supply VCC2 is connected to the resistor R3 through the collector and the emitter of the triode, and then the resistor R14 is connected with GND in series to form a conducting loop. Meanwhile, when the B-phase analog sub-circuit detects a low-level signal, a first power supply VCC1 forms a conducting loop through an R5 resistor, an R4 resistor and an LED2 display lamp to a second pin of the CN2 connector. The R4 resistor is a voltage dividing resistor, and a potential difference exists at the connecting point of the R3 resistor and the R4 resistor, and the potential difference acts on the base electrode of the triode N2 to conduct the triode N2. When the triode N2 is turned on, the second power supply VCC2 is connected to the resistor R6 through the emitter of the triode, and then the resistor R14 is connected to GND in series to form a conduction loop. That is, when the a-phase analog sub-circuit and the B-phase analog sub-circuit operate simultaneously, the circuit can be simplified as shown in fig. 4: the R3 resistor and the R6 resistor are connected in parallel and then connected with the R14 in series to form a loop. At this time, the singlechip 2 collects the voltage value at the right end of the R10 through the data collection 2, and performs analog-to-digital conversion on the voltage value by using an internal integrated analog-to-digital converter, and then the singlechip 2 sends the converted value to an upper computer, namely a PC monitoring end. The VCC1 in this example has a value of 10-13V and VCC2 has a value of 3-5V. As a power supply mode, VCC1 in this embodiment takes a value of +12v and VCC2 takes a value of +5v.
The mapping relationship between the collected voltage value and the AD value after analog-to-digital conversion is shown in table 1:
TABLE 1
In the embodiment of the invention, a driving mode of 4-phase eight beats is defined as follows:
forward rotation mode: a, AB, B, BC, C, CD, D and DA;
inversion scheme: DA- & gt D- & gt CD- & gt C- & gt BC- & gt B- & gt AB- & gt A.
It should be noted that U represents the power supply voltage of the singlechip, and the value range is 1-5V. The value of M is related to the number N of bits of the register in the chip microcomputer, m=2 N . For example, if the register is 8 bits, the value of M is 256; if the register is 10 bits, the value of M is 1024. In addition, the analog circuit can also simulate a device similar to an electronic expansion valve, such as a four-phase eight-beat swing wind motor. Moreover, the present embodiment takes a 4-phase analog sub-circuit as an example, and those skilled in the art will recognize that the analog circuit can be extended to more phases, such as E-phase and F-phase, according to the needs of the user, and each path has the same working principle.
The analog circuit designed in the embodiment of the invention adopts a triode, mainly utilizes the switching action of the triode to convert the current signal of the driving electronic expansion valve into a voltage signal detected by a singlechip, and specifically comprises the following steps: when the analog circuit simulates different working states of the electronic expansion valve, different resistance states can be formed at the emitter of the triode, different analog voltages are correspondingly formed, and finally the single chip microcomputer detects the voltage by adopting an AD acquisition port and converts different analog voltage signals into different analog signals in the single chip microcomputer so as to realize the function of simulating the working states of the electronic expansion valve.
Compared with the traditional method adopting a simple resistance simulation mode, the traditional simulation circuit has no triode circuit, and the excessive current can cause voltage and current impact on the singlechip on the side of the detection board. The invention has the advantages that the triode is added, the triode plays a role of a switch, the singlechip on the side of the detection plate can be protected from voltage and current impact, the analog circuit has a simple structure, is stable and reliable, and is convenient to operate during development and debugging. Furthermore, an LED lamp is added in the analog circuit for displaying the working state of each analog sub-circuit, so that a developer can more clearly see the working state of each phase of electronic expansion valve.
Fig. 5 is a third schematic circuit diagram of an analog circuit of an electronic expansion valve according to an embodiment of the present invention. As shown in fig. 5, the circuit includes: a driving circuit 101, an analog circuit 102, a processing unit 103, and a voltage dividing circuit 105. Referring to fig. 8, the voltage divider 105 includes a current limiting resistor R10, a filter capacitor C1, and a clamping diode D1, where one end of the current limiting resistor R10 is connected to the analog circuit 102, and the other end is connected to the filter capacitor C1 and then connected in series to the anode of the clamping diode D1 and the processing unit 103.
Fig. 6 is a schematic block diagram of an analog circuit of an electronic expansion valve according to an embodiment of the present invention. As shown in fig. 6, the embodiment of the present invention further includes a filter circuit 104, which is different from the embodiment shown in fig. 5. The filter circuit 104 can function as a low-pass filter to filter out high-frequency interference parts in the signals and prevent the high-frequency interference signals from entering the detection end of the singlechip.
Fig. 7 is a schematic block diagram of an analog circuit of an electronic expansion valve according to an embodiment of the present invention. As shown in fig. 7, the embodiment of the present invention further includes a display unit 106, which is different from the embodiment shown in fig. 6. The target number of steps and the actual number of steps may be transmitted to the display unit 106 through the processing unit 103, so that development and debugging efficiency is improved.
Fig. 8 is a schematic circuit diagram of an electronic expansion valve analog circuit according to an embodiment of the present invention. Fig. 9 is a schematic circuit diagram of a driving circuit according to an embodiment of the present invention. As shown in fig. 8 and 9, in the driving circuit 101, a ULN2003 driving chip may be used as a driving chip (i.e., IC 4). Pins 1 to 4 of the driving chip are respectively connected with 4 output pins of the processing unit; pins 13 to 16 of the driving chip are respectively connected with input ends of the analog circuit 102 (namely, a D-phase analog sub-circuit, a C-phase analog sub-circuit, a B-phase analog sub-circuit and an A-phase analog sub-circuit) through connectors CN1 and CN 2; the output of the analog circuit 102 is connected to a filter circuit 104, and a voltage dividing circuit 105 (composed of R10, C1, and D1). In the embodiment of the invention, the processing unit 103 comprises a single chip microcomputer 1, a single chip microcomputer 2 and a PC monitoring end. It should be noted that, those skilled in the art can know that in practical application, the number of the single-chip microcomputer can be increased or decreased according to specific situations, and the single-chip microcomputer and the PC monitoring end can be in communication connection through wired or wireless.
As an implementation manner, the values of the circuit elements in this embodiment are as follows: VCC1 = +12v; VCC2 = +5v; c1 =100 nF; r1=r4=r7=r11=10kΩ; r2=r5=r8=r12=20kΩ; r3=2kΩ; r6=4kΩ; r9=8kΩ; r13=16kΩ; r10=1kΩ; r14=10kΩ.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. An electronic expansion valve analog circuit, comprising: the device comprises a driving circuit, an analog circuit, a processing unit and a filter circuit; wherein,
the driving circuit is connected with the processing unit and is used for driving the analog circuit according to a control instruction sent by the processing unit, and the control instruction is used for indicating the target working state of the analog circuit;
the analog circuit is connected with the driving circuit and is used for simulating the electronic expansion valve and outputting feedback information to the processing unit;
the processing unit obtains the actual working state of the analog circuit according to the feedback information, and generates a control instruction according to the actual working state;
the filter circuit is connected with the analog circuit and comprises a voltage dividing resistor;
wherein, the working state comprises a rotation mode and a rotation step number;
the analog circuit comprises at least 4 groups of analog subcircuits with the same structure, and the analog subcircuits comprise a light emitting diode, a triode, a first resistor, a second resistor and a third resistor; the cathode of the light emitting diode is connected with the driving circuit, the anode of the light emitting diode is connected with one end of the first resistor, and the other end of the first resistor is connected to a first power supply through the second resistor; the connecting point of the first resistor and the second resistor is connected with the base electrode of the triode, the emitting electrode of the triode is connected with one end of the third resistor, the collecting electrode of the triode is connected with the second power supply, and the other end of the third resistor is connected with the filter circuit;
the processing unit is connected with the analog circuit, the voltage dividing circuit comprises a current limiting resistor, a filter capacitor and a clamping diode, one end of the current limiting resistor is connected with the analog circuit, the other end of the current limiting resistor is connected with the filter capacitor and then grounded, and the connection point of the other end of the current limiting resistor and the filter capacitor is respectively connected with the anode of the clamping diode and the processing unit.
2. The circuit of claim 1, wherein the processing unit determines the actual operating state of the analog circuit according to the feedback information, the voltages at the other ends of the current limiting resistors corresponding to the feedback information, and the preset mapping relationship between the voltages and the operating state.
3. The circuit of claim 1, wherein the processing unit comprises an upper computer and a lower computer, the upper computer and the lower computer being communicatively coupled.
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