CN219345040U - Circuit for capturing starting peak current of fan and electronic equipment - Google Patents
Circuit for capturing starting peak current of fan and electronic equipment Download PDFInfo
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- CN219345040U CN219345040U CN202320140954.7U CN202320140954U CN219345040U CN 219345040 U CN219345040 U CN 219345040U CN 202320140954 U CN202320140954 U CN 202320140954U CN 219345040 U CN219345040 U CN 219345040U
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Abstract
The application discloses catch circuit and electronic equipment of start-up peak current of fan includes: the input end of the sampling circuit is connected with a power supply, and the sampling circuit is used for acquiring and processing the power supply voltage in real time; the input end of the voltage comparison circuit is connected with the output end of the sampling circuit, and the voltage comparison circuit is used for outputting the output voltage U of the sampling circuit output And a reference voltage U ref Comparing and outputting the level state of the voltage comparison result; a driving circuit, aThe input end of the driving circuit is connected with the output end of the voltage comparison circuit; the power supply is connected with the fan, the fan is connected with the input end of the switch circuit, the control end of the switch circuit is connected with the output end of the driving circuit, and the driving circuit is used for controlling the on-off between the input end and the output end of the switch circuit according to the level state.
Description
Technical Field
The embodiment of the application relates to the field of fans, in particular to a circuit and electronic equipment for capturing the starting peak current of a fan.
Background
The starting peak current of the fan is far greater than the current of the normal operation of the fan, so that the accurate starting peak current needs to be mastered when the fan is designed. Fig. 1 shows a prior art manner of obtaining the peak current of the start of a fan. As shown in fig. 1, the fan is started by manually controlling the motor power supply through the switch Q1, and the starting current of the fan is captured by the oscilloscope. However, the power supply is a 50Hz sine wave and the maximum peak start current is only obtained when the blower is started at the peak voltage. However, the hand-controlled switch cannot accurately capture the voltage peak value within 20ms, and if the switch is closed at an improper time, it is difficult to capture the maximum starting current. Therefore, multiple tests are needed in the mode, and compared with multiple test results to obtain relatively large current as a starting current peak value, so that the experimental result has large uncertainty and low accuracy.
Disclosure of Invention
The utility model aims to overcome the defects of inaccurate and low efficiency of manually acquiring the starting peak current of a fan in the prior art, and provides a circuit and electronic equipment for capturing the starting peak current of the fan.
The utility model solves the technical problems by the following technical scheme:
in a first aspect, the present application provides a circuit for capturing a startup peak current of a blower, comprising:
the input end of the sampling circuit is connected with a power supply, and the sampling circuit is used for acquiring and processing the power supply voltage in real time;
the input end of the voltage comparison circuit is connected with the output end of the sampling circuit, and the voltage comparison circuit is used for outputting the output voltage U of the sampling circuit output And a reference voltage U ref Comparing and outputting the level state of the voltage comparison result;
the input end of the driving circuit is connected with the output end of the voltage comparison circuit;
the power supply is connected with the fan, the fan is connected with the input end of the switch circuit, the control end of the switch circuit is connected with the output end of the driving circuit, and the driving circuit is used for controlling the on-off between the input end and the output end of the switch circuit according to the level state.
Preferably, when the output voltage of the sampling circuit is greater than or equal to the reference voltage, the voltage comparison circuit outputs a high level, and the driving circuit controls the conduction between the input end and the output end of the switching circuit; when the output voltage of the sampling circuit is smaller than the reference voltage, the voltage comparison circuit outputs a low level, and the driving circuit controls the disconnection between the input end and the output end of the switching circuit.
Preferably, the sampling circuit is a buck sampling circuit, and the buck sampling circuit includes:
one end of the first resistor is connected with the N pole of the power supply;
one end of the second resistor is connected with the L pole of the power supply;
the non-inverting input end of the differential amplifier is connected with the other end of the first resistor, and the inverting input end of the differential amplifier is connected with the other end of the second resistor;
one end of the third resistor is connected with the non-inverting input end of the differential amplifier, and the other end of the third resistor is grounded;
one end of the fourth resistor is connected with the inverting input end of the differential amplifier, and the other end of the fourth resistor is connected with the output end of the differential amplifier;
the resistance of the first resistor is equal to that of the second resistor, the resistance of the third resistor is equal to that of the fourth resistor, and the output voltage U output ＝-U LN * R3/R1, wherein U LN Is the supply voltage.
Preferably, the voltage comparing circuit includes a voltage comparator, a first input terminal of the voltage comparator is connected with the output terminal of the sampling circuit, a second input terminal of the voltage comparator inputs the reference voltage, and an output terminal of the voltage comparator is connected with the input terminal of the driving circuit.
Preferably, the second input terminal of the voltage comparator is connected with a reference resistor.
Preferably, the reference resistor is a variable resistor.
Preferably, the switching circuit comprises a switching tube, the input end of the switching tube is connected with the power supply, the output end of the switching tube is connected with the fan, and the control end of the switching tube is connected with the driving circuit.
Preferably, the switching tube is an IGBT.
Preferably, the switch tube is a silicon controlled rectifier.
In a second aspect, the present application provides an electronic device comprising a circuit as described above that captures a peak start-up current of a blower.
The positive progress effect of this application lies in: according to the circuit for capturing the starting peak current of the fan, the power supply voltage is sampled through the sampling circuit, and the output voltage U of the sampling circuit is output through the comparison circuit output And a reference voltage U ref And comparing, wherein the driving circuit controls the on-off of the switching circuit according to the comparison result of the comparison circuit, so as to control whether the fan is electrified. By varying the reference voltage U ref The starting current of the fan can be changed, and further the starting peak current can be accurately captured.
Drawings
The following drawings are only for purposes of illustration and explanation of the present application and are not intended to limit the scope of the present application.
FIG. 1 illustrates a block diagram of a circuit that captures a startup peak current of a blower according to an embodiment of the present application;
FIG. 2 illustrates a circuit diagram of a circuit that captures peak current at startup based on the blower of FIG. 1 in accordance with an embodiment of the present application;
FIG. 3 shows a circuit diagram of a sampling circuit according to an embodiment of the present application;
reference numerals illustrate:
First resistor R1
Second resistor R2
Third resistor R3
Fourth resistor R4
Reference resistance RH
Voltage comparator 21
Switching circuit 40
Detailed Description
For a clearer understanding of technical features, objects, and effects of embodiments of the present application, a specific implementation of embodiments of the present application will be described with reference to the accompanying drawings.
The starting peak current of the fan is far greater than the current of the normal operation of the fan, so that the accurate starting peak current needs to be mastered when the fan is designed. Fig. 1 shows a prior art manner of obtaining the peak current of the start of a fan. As shown in fig. 1, the fan is started by manually controlling the motor power supply through the switch Q1, and the starting current of the fan is captured by the oscilloscope. However, the power supply is a 50Hz sine wave and the maximum peak start current is only obtained when the blower is started at the peak voltage. However, the hand-controlled switch cannot accurately capture the voltage peak value within 20ms, and if the switch is closed at an improper time, it is difficult to capture the maximum starting current. Therefore, multiple tests are needed in the mode, and compared with multiple test results to obtain relatively large current as a starting current peak value, so that the experimental result has large uncertainty and low accuracy.
Based on the above problems, embodiments of the present application provide a circuit and an electronic device for capturing a startup peak current of a fan, so as to at least partially solve the above technical problems.
Specific implementations of embodiments of the present application are described in detail below with reference to the accompanying drawings.
The present embodiment provides aThe circuit for capturing the starting peak current of the blower comprises a sampling circuit 10, a voltage comparison circuit 20, a driving circuit 30 and a switching circuit 40, as shown in fig. 1. Specifically, as shown in fig. 1 and 2, the input end of the sampling circuit 10 is connected to a power supply, the output end of the sampling circuit 10 is connected to the input end of the voltage comparison circuit 20, the input end of the driving circuit 30 is connected to the output end of the voltage comparison circuit 20, the input end of the switching circuit 40 is connected to the power supply, the output end of the switching circuit 40 is connected to a fan, and the control end of the switching circuit 40 is connected to the output end of the driving circuit 30. Wherein, the sampling circuit 10 acquires and processes the power voltage in real time, the voltage comparison circuit 20 outputs the output voltage U of the sampling circuit 10 output And a reference voltage U ref The level state of the voltage comparison result is compared and output, and the driving circuit 30 controls the on-off between the input terminal and the output terminal of the switching circuit 40 according to the level state.
In the present embodiment, the power supply voltage is sampled by the sampling circuit, and the output voltage U of the sampling circuit is sampled by the comparison circuit output And a reference voltage U ref And comparing, wherein the driving circuit controls the on-off of the switching circuit according to the comparison result of the comparison circuit, so as to control whether the fan is electrified. By varying the reference voltage U ref The starting current of the fan can be changed, and further the starting peak current can be accurately captured.
Specifically, when the output voltage of the sampling circuit 10 is greater than or equal to the reference voltage, the voltage comparing circuit 20 outputs a high level, and the driving circuit 30 controls conduction between the input terminal and the output terminal of the switching circuit 40; when the output voltage of the sampling circuit 10 is smaller than the reference voltage, the voltage comparing circuit 20 outputs a low level, and the driving circuit 30 controls the input terminal and the output terminal of the switching circuit 40 to be disconnected.
In this embodiment, only when the output voltage of the sampling circuit is greater than or equal to the reference voltage, the input end and the output end of the switching circuit are conducted, and the fan is started electrically. By varying the magnitude of the reference voltage, the start-up peak current can be accurately captured. For example, a relatively small reference voltage U1 may be set according to experience or design parameters, and the current I1 is captured; then adjusting the reference voltage to U2 slightly larger than U1, and capturing current I2 at the moment; then, adjusting the reference voltage to be U3 slightly larger than U2, and capturing current I3 at the moment; then continue to adjust the reference voltage to U4 slightly greater than U3, at which point the oscilloscope does not catch any current, as shown in table 1, indicating that the start-up peak current is between U3 and U4, I3 can be taken as the peak start-up current. To improve the accuracy of the captured peak current, further testing may be continued between U3 and U4.
| U1 | I1 |
| U2 | I2 |
| U3 | I3 |
| U4 | NA |
TABLE 1
Specifically, based on the above embodiment, in one possible implementation, the sampling circuit 10 is a buck sampling circuit, including the differential amplifier 101, the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4. As shown in fig. 3, one end of the first resistor R1 is connected to the N pole of the power supply, the other end of the first resistor R2 is connected to the non-inverting input terminal of the differential amplifier 101, one end of the second resistor R2 is connected to the L pole of the power supply, the other end of the second resistor R2 is connected to the inverting input terminal of the differential amplifier 101, one end of the third resistor R3 is connected to the non-inverting input terminal of the differential amplifier 101, the other end of the third resistor R3 is grounded,one end of the fourth resistor R4 is connected to the inverting input terminal of the differential amplifier 101, and the other end of the fourth resistor R4 is connected to the output terminal of the differential amplifier 101. Wherein the resistance of the first resistor R1 is equal to the resistance of the second resistor R2 (r1=r2), the resistance of the third resistor R3 is equal to the resistance of the fourth resistor R4 (r3=r4), i.e. r1=r2, r3=r4, the output voltage uoutput= -U LN * R3/R1, as shown in FIG. 3, U LN Is the potential difference between the L pole and the N pole of the power supply, i.e. the power supply voltage.
The power supply voltage is 220V, and the voltage of the power supply is reduced to be low voltage by the voltage-reducing sampling circuit 10, so that the voltage comparison circuit 20 can conveniently perform voltage comparison.
Specifically, in one implementation, R3/r1=5/22, the buck sampling circuit 10 reduces the 220V high voltage to a ±5v voltage signal.
Specifically, based on the above embodiment, in one implementation, the voltage comparing circuit 20 includes a voltage comparator 21. As shown in fig. 3, a first input terminal of the voltage comparator 21 is connected to an output terminal of the sampling circuit 10, a second input terminal of the voltage comparator 21 inputs a reference voltage, and an output terminal of the voltage comparator 21 is connected to an input terminal of the driving circuit 30.
Specifically, the second input terminal of the voltage comparator 21 is connected to a reference resistor RH, which is a variable resistor.
The magnitude of the reference voltage can be adjusted through the variable resistor, so that the current for the fan to be started electrically is changed, and the oscilloscope is convenient to capture accurate starting peak current.
Specifically, based on the above embodiment, in one implementation, the switching circuit 40 includes a switching tube, as shown in fig. 3. The input of switch tube is connected with power L level, and the output of switch tube is connected with the input of fan, and the control end of switch tube is connected with drive circuit 30, and the output of fan is connected with power N level.
In one possible embodiment, the switching tube is an IGBT. If the voltage comparator 21 outputs a high level, the driving circuit 30 sends out a pulse signal to trigger the IGBT, and after the IGBT is conducted, the motor is started electrically. The switching speed of the IGBT is in nanosecond level, and the response speed is high.
In other embodiments, the switching tube may also be a thyristor.
The electronic device provided in this embodiment includes the circuit for capturing the start peak current of the fan, and has the beneficial effects of the corresponding circuit embodiment, which is not described herein.
It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the various embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
The foregoing is illustrative of the embodiments of the present application and is not to be construed as limiting the scope of the embodiments of the present application. Any equivalent alterations, modifications and combinations thereof will be effected by those skilled in the art without departing from the spirit and principles of the embodiments of this application, and it is intended to be within the scope of the embodiments of this application.
Claims (10)
1. A circuit for capturing a peak start-up current of a blower, comprising:
the sampling circuit (10), the input end of the sampling circuit (10) is connected with a power supply, and the sampling circuit (10) is used for acquiring and processing the power supply voltage in real time;
the input end of the voltage comparison circuit (20) is connected with the output end of the sampling circuit (10), and the voltage comparison circuit (20) is used for outputting the output voltage U of the sampling circuit (10) output And a reference voltage U ref Comparing and outputting the level state of the voltage comparison result;
the input end of the driving circuit (30) is connected with the output end of the voltage comparison circuit (20);
the fan drive circuit comprises a switch circuit (40), wherein the input end of the switch circuit (40) is connected with the power supply, the output end of the switch circuit (40) is connected with the fan, the control end of the switch circuit (40) is connected with the output end of the drive circuit (30), and the drive circuit (30) is used for controlling the on-off between the input end and the output end of the switch circuit (40) according to the level state.
2. The circuit for capturing a start-up peak current of a blower according to claim 1, wherein when an output voltage of the sampling circuit (10) is greater than or equal to the reference voltage, the voltage comparing circuit (20) outputs a high level, and the driving circuit (30) controls conduction between an input terminal and an output terminal of the switching circuit (40); when the output voltage of the sampling circuit (10) is smaller than the reference voltage, the voltage comparison circuit (20) outputs a low level, and the driving circuit (30) controls the disconnection between the input end and the output end of the switching circuit (40).
3. The circuit for capturing a peak start-up current of a blower of claim 2, wherein the sampling circuit is a buck sampling circuit comprising:
a first resistor (R1), wherein one end of the first resistor (R1) is connected with the N pole of the power supply;
a second resistor (R2), wherein one end of the second resistor (R2) is connected with the L pole of the power supply;
a differential amplifier (101), wherein a non-inverting input end of the differential amplifier (101) is connected with the other end of the first resistor (R1), and an inverting input end of the differential amplifier (101) is connected with the other end of the second resistor (R2);
one end of the third resistor (R3) is connected with the non-inverting input end of the differential amplifier (101), and the other end of the third resistor (R3) is grounded;
one end of the fourth resistor (R4) is connected with the inverting input end of the differential amplifier (101), and the other end of the fourth resistor (R4) is connected with the output end of the differential amplifier (101);
the resistance of the first resistor (R1) is equal to the resistance of the second resistor (R2), and the third resistor (R3)The resistance value is equal to that of the fourth resistor (R4), the output voltage U output ＝-U LN * R3/R1, wherein U LN Is the supply voltage.
4. A circuit for capturing a start-up peak current of a wind turbine according to claim 3, wherein said voltage comparing circuit (20) comprises a voltage comparator (21), a first input terminal of said voltage comparator (21) is connected to an output terminal of said sampling circuit (10), a second input terminal of said voltage comparator (21) inputs said reference voltage, and an output terminal of said voltage comparator (21) is connected to an input terminal of said driving circuit (30).
5. Circuit for capturing the start-up peak current of a wind turbine according to claim 4, wherein the second input of said voltage comparator (21) is connected to a reference Resistor (RH).
6. The circuit for capturing peak startup current of a blower of claim 5, wherein the reference resistor is a variable resistor.
7. A circuit for capturing the start-up peak current of a wind turbine according to claim 2, wherein said switching circuit (40) comprises a switching tube, an input terminal of said switching tube being connected to said power supply, an output terminal of said switching tube being connected to said wind turbine, and a control terminal of said switching tube being connected to said driving circuit (30).
8. The circuit for capturing the peak starting current of a blower of claim 7, wherein the switching tube is an IGBT.
9. The circuit for capturing peak starting current of a blower of claim 7, wherein the switching tube is a thyristor.
10. An electronic device comprising a circuit as claimed in any one of claims 1-9 that captures the peak start-up current of a wind turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320140954.7U CN219345040U (en) | 2023-01-29 | 2023-01-29 | Circuit for capturing starting peak current of fan and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320140954.7U CN219345040U (en) | 2023-01-29 | 2023-01-29 | Circuit for capturing starting peak current of fan and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN219345040U true CN219345040U (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320140954.7U Active CN219345040U (en) | 2023-01-29 | 2023-01-29 | Circuit for capturing starting peak current of fan and electronic equipment |
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| Country | Link |
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| CN (1) | CN219345040U (en) |
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2023
- 2023-01-29 CN CN202320140954.7U patent/CN219345040U/en active Active
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