Rotation speed detection device
By designing a speed detection device and utilizing interface circuits, speed measurement circuits, and operational control circuits, the simultaneous speed detection of multiple fans was achieved, solving the problem of low efficiency in existing technologies and improving the accuracy and efficiency of speed detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG CHENGYI TECH CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-06-12
Smart Images
Figure CN224352124U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of detection device technology, and in particular to a speed detection device. Background Technology
[0002] In existing technologies, when conducting aging tests on exhaust fans, it is necessary to check the speed of multiple fans simultaneously. Generally, a stroboscopic tachometer or an infrared tachometer is used for individual measurement. When using a stroboscopic tachometer, the tester needs to visually observe the tachometer, which has a large operational error. Using an infrared tachometer will obstruct the air duct and cause measurement errors. Furthermore, neither of the above two methods can measure the speed of multiple exhaust fans simultaneously, resulting in low efficiency. Utility Model Content
[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.
[0004] Therefore, one objective of this utility model is to provide a speed detection device that can be connected to at least one fan simultaneously, automatically test the speed of at least one fan, and detect whether the speed of at least one fan meets the product standard based on the speed test results, thereby greatly improving the efficiency of speed detection.
[0005] To achieve the above objectives, a first aspect of this utility model provides a speed detection device, comprising: at least one interface circuit, the first end of which is connected to at least one fan for receiving an access signal from the at least one fan and driving the fan to operate; a speed adjustment circuit, one end of which is connected to the third end of the at least one interface circuit for receiving a start trigger signal and outputting a speed control signal; an operational control circuit, the first preset pin of which is connected to the other end of the speed adjustment circuit, and a plurality of second preset pins of which are connected to the fourth end of the at least one interface circuit for receiving the speed control signal and the actual speed control signal of the fan and outputting a speed detection result; and a power control circuit, the first end of which is connected to a DC power input interface, the third end of which is connected to the first power input terminal of the at least one interface circuit, the speed adjustment circuit, and the operational control circuit, the fourth end of which is connected to the third preset pin of the operational control circuit, the fifth end of which is connected to the fourth preset pin of the operational control circuit, and the sixth end of which is connected to the second end of the at least one interface module for outputting a power supply voltage to power the at least one interface circuit, the speed adjustment circuit, and the operational control circuit respectively.
[0006] According to the speed detection device of this utility model embodiment, at least one interface circuit is connected to at least one fan at its first end. The power control circuit supplies power to at least one interface circuit, speed measurement circuit, and arithmetic control circuit. The speed measurement circuit receives a start trigger signal, controls at least one fan to run simultaneously, and outputs a speed control signal to the arithmetic control circuit. At the same time, the actual speed control signal during the fan operation is output to the arithmetic control circuit. The arithmetic control circuit outputs the speed detection result based on the speed control signal and the actual speed control signal. The speed detection device of this utility model can connect to at least one fan simultaneously, automatically test the speed of at least one fan, and detect whether the speed of at least one fan meets the product standard based on the speed test result, thus greatly improving the efficiency of speed detection.
[0007] In some embodiments, at least one interface circuit includes: a filtering and stabilizing sub-circuit, the first end of which is connected to a first power input terminal, the second end of which is connected to a second pin of the fan, the third end of which is connected to power ground, and the fourth end of which is connected to a second preset pin of the operational control circuit, for blocking high-frequency noise and fluctuation noise of the power supply voltage; and a driving sub-circuit, the first end of which is connected to one end of a speed adjustment and measurement circuit, the second end of which is connected to the fan, the third end of which is connected to one end of the speed adjustment and measurement circuit, and the fourth end of which is connected to a fifth terminal of a power control circuit, for receiving the filtered power supply voltage corresponding to the fan's access signal and driving the fan to operate.
[0008] In some embodiments, the filter stabilization sub-circuit includes: a first resistor, one end of which is connected to a first power input terminal, and the other end of which is connected to a first pin of a fan; a second resistor, one end of which is connected to a second preset pin of an operational control circuit, and the other end of which is connected to the other end of the first resistor; a first capacitor, one end of which is connected to the other end of the first resistor, and the other end of which is connected to power ground; and a first diode, the cathode of which is connected to the other end of the first resistor, and the anode of which is connected to power ground.
[0009] In some embodiments, the drive sub-circuit includes: a third resistor, one end of which is connected to one end of the speed control module, and the other end of which is connected to the second pin of the fan; and a second capacitor, one end of which is connected to the third pin of the fan, and the other end of which is connected to the fifth terminal of the power control circuit.
[0010] In some embodiments, the speed measurement circuit includes: a fourth resistor, one end of which is connected to a first power input terminal; a first transistor, the collector of which is connected to the other end of the fourth resistor and a third terminal of at least one interface circuit, and the emitter of which is connected to power ground; a fifth resistor, one end of which is connected to one end of the fourth resistor and the first power input terminal, and the other end of which is connected to a first preset pin of the operational control circuit; a sixth resistor, one end of which is connected to the other end of the fifth resistor, and the other end of which is connected to the base of the first transistor; a third capacitor, one end of which is connected to the other end of the sixth resistor, and the other end of which is connected to power ground; and a seventh resistor, one end of which is connected to one end of the third capacitor, and the other end of which is connected to power ground.
[0011] In some embodiments, the power control circuit includes: a power input sub-circuit, a first terminal of which is connected to a DC power input interface, and a fourth terminal of which is connected to a third preset pin of an operational control circuit, for receiving electrical energy; a first power output circuit, one terminal of which is connected to a second terminal of the power input sub-circuit, and the other terminal of which is connected to a first power input terminal of a display circuit, for receiving electrical energy and outputting a first supply voltage to the display circuit; a second power output circuit, one terminal of which is connected to the third terminal of the power input sub-circuit, and the other terminal of which is connected to the first power input terminal of at least one interface circuit, a speed adjustment circuit, and an operational control circuit, for receiving electrical energy and outputting a second supply voltage to at least one interface circuit, a speed adjustment circuit, and an operational control circuit; and a power drive circuit, a first terminal of which is connected to a fourth preset pin of the operational control circuit, a second terminal of which is connected to a high-voltage power supply, and a third terminal of which is connected to the second terminal of at least one interface module, for turning on or off the power supply path of the high-voltage power supply and at least one interface module.
[0012] In some embodiments, the speed detection device further includes: at least one alarm circuit, wherein a first power input terminal of the at least one alarm circuit is connected to a third terminal of the power control circuit, one end of the at least one alarm circuit is connected to a plurality of fourth preset pins of the arithmetic control circuit, and the other end of the at least one alarm circuit is connected to a fifth preset pin of the arithmetic control circuit, for issuing an alarm prompt when receiving abnormal information of at least one fan speed.
[0013] In some embodiments, the speed detection device further includes: a display circuit, wherein the second power input terminal of the display circuit is connected to the second terminal of the power control circuit, the first terminal of the display circuit is connected to the sixth preset pin of the arithmetic control circuit, the second terminal of the display circuit is connected to the seventh preset pin of the arithmetic control circuit, and the third terminal of the display circuit is connected to the display screen circuit of the speed detection device, for displaying the speed of at least one fan.
[0014] In some embodiments, at least one alarm circuit includes: an eighth resistor, one end of which is connected to a first power input terminal; a first LED, one end of which is connected to the other end of the eighth resistor, and the other end of which is connected to a fourth preset pin of the operational control circuit; a buzzer, one end of which is connected to the first power input terminal; a second transistor, the collector of which is connected to the other end of the buzzer, and the emitter of which is connected to power ground; a fourth capacitor, one end of which is connected to the emitter of the second transistor, and the other end of which is connected to the base of the second transistor; and a ninth resistor, the first... One end of resistor 9 is connected to one end of capacitor 4, and the other end of resistor 9 is connected to the other end of capacitor 4; resistor 10, one end of resistor 10 is connected to the base of transistor 2, and the other end of resistor 10 is connected to the fifth preset pin of the operational control circuit; capacitor 5, one end of capacitor 5 is connected to the first power input terminal, and the other end of capacitor 5 is connected to the relay of transistor 2; diode 2, the cathode of diode 2 is connected to the first power input terminal, and the anode of diode 2 is connected to the relay of transistor 2; capacitor 6, one end of capacitor 6 is connected to the first power input terminal, and the other end of capacitor 6 is connected to ground.
[0015] In some embodiments, the display circuit includes: an eleventh resistor, one end of which is connected to a seventh preset pin of the arithmetic control circuit, and the other end of which is connected to a second pin of the display circuit; a twelfth resistor, one end of which is connected to a sixth preset pin of the arithmetic control circuit, and the other end of which is connected to a third pin of the display circuit; a seventh capacitor, one end of which is connected to the seventh preset pin of the arithmetic control circuit, and the other end of which is connected to power ground; an eighth capacitor, one end of which is connected to the other end of the twelfth resistor, and the other end of which is connected to power ground; and a ninth capacitor, one end of which is connected to a second power input terminal, and the other end of which is connected to power ground.
[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0018] Figure 1 This is a schematic diagram of the structure of a speed detection device according to an embodiment of the present invention.
[0019] Figure label:
[0020] Speed detection device 1;
[0021] Interface circuit 11; speed measurement circuit 12; operational control circuit 13; power control circuit 14;
[0022] Filter stabilization sub-circuit 111; Drive sub-circuit 112;
[0023] First resistor R8; Second resistor R12; First capacitor C12; First diode D3;
[0024] Third resistor R52; Second capacitor C13;
[0025] Fourth resistor R11; First transistor Q2; Fifth resistor R10; Sixth resistor R15; Third capacitor C16; Seventh resistor R19;
[0026] Power input sub-circuit 141; first power output circuit 142; second power output circuit 143; power drive circuit 144;
[0027] Alarm circuit 15; display circuit 16.
[0028] Eighth resistor R48; First LED LED8; Buzzer 1; Second transistor Q4; Fourth capacitor C20; Ninth resistor R27; Tenth resistor R21; Fourth capacitor C20; Ninth resistor R27; Tenth resistor R21; Fifth capacitor C11; Second diode D2; Sixth capacitor C10;
[0029] Eleventh resistor R17, twelfth resistor R18, seventh capacitor C19, eighth capacitor C17, ninth capacitor C18
[0030] Third diode D1; First electrolytic capacitor CE1; Tenth capacitor C2; Thirteenth resistor R2; Second LED LED9; Fourteenth resistor R3; Fifteenth resistor R4; Eleventh capacitor C6; Sixteenth resistor R6; Seventeenth resistor R7J1; Second electrolytic capacitor CE3; Twelfth capacitor C3; Thirteenth capacitor C4;
[0031] First chip U1; Eighteenth resistor R5; First inductor L1; Fourteenth capacitor C5; Third electrolytic capacitor CE2; Nineteenth resistor R1; Fifteenth capacitor C1;
[0032] Voltage regulator LDO1; sixteenth capacitor C7; seventeenth capacitor C8; fourth electrolytic capacitor CE5; twentieth resistor R9;
[0033] The twenty-first resistor is R20; the twenty-second resistor is R24; the second transistor is Q3; the twenty-third resistor is R16; the twenty-fourth resistor is R14; and the first switching transistor is Q1. Detailed Implementation
[0034] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.
[0035] like Figure 1 As shown, the speed detection device 1 of this utility model embodiment includes: at least one interface circuit 11, a speed measurement circuit 12, an arithmetic control circuit 13, and a power control circuit 14, wherein,
[0036] At least one interface circuit 11 has its first terminal connected to at least one fan, for example, denoted as FAN1. Figure 1 It includes eight interface circuits, corresponding to eight fans FAN1-FAN8, used to receive the access signal of at least one fan and drive the fan to operate; one end of the speed control circuit 12 is connected to the third end of at least one interface circuit 11, used to receive the start trigger signal and output the speed control signal; the first preset pin, i.e., pin 43, of the arithmetic control circuit 13 is connected to the other end of the speed control circuit 12, and multiple second preset pins, i.e., pins FG1-8, of the arithmetic control circuit 13 are connected to the fourth end of at least one interface circuit 11, used to receive the speed control signal and the actual speed control signal of the fan, and output the speed detection result; power control circuit... The first end of circuit 14 is connected to the DC power input interface. The third end of power control circuit 14 is connected to the first power input terminal 5V_2 of at least one interface circuit 11, speed measurement circuit 12 and operation control circuit 13. The fourth end of power control circuit 14 is connected to the third preset pin, i.e., pin 24, of operation control circuit 13. The fifth end of power control circuit 14 is connected to the fourth preset pin, i.e., pin 4, of operation control circuit 13. The sixth end of power control circuit 14 is connected to the second end of at least one interface module and is used to output the power supply voltage to power at least one interface circuit 11, speed measurement circuit 12 and operation control circuit 13 respectively.
[0037] In this embodiment, before the test begins, at least one fan is connected to the speed detection device 1 through the FAN1~FAN8 terminals. At least one interface circuit 11 receives the connection signal of at least one fan. The low-voltage power supply is connected to the power control circuit 14 through the DC power input interface, i.e., the DC1 interface. The power control circuit 14 provides 12V power to the speed detection device 1 and outputs different power supply voltages to at least one interface circuit 11, the speed measurement circuit 12, and the operation control circuit 13 to power them.
[0038] Once the speed detection device 1 is powered on, it begins operation. The speed adjustment circuit 12 receives the start-up trigger signal, and the calculation control circuit 13 starts at least one fan through the speed adjustment circuit 12 and controls at least one fan to operate simultaneously according to a preset program. For example, the first step is: 5500 RPM for 30 seconds, then stop for 30 seconds; the second step is: 6500 RPM for 30 seconds, then stop for 30 seconds; the third step is: 7500 RPM for 30 seconds, then stop for 30 seconds. The above three steps constitute one cycle, which is run 2000 times. The preset program is pre-set according to the product usage scenario, and all fans have the same set speed at the same time.
[0039] Multiple second preset pins, namely FG1-8 pins, of the arithmetic control circuit 13 are connected to the fourth terminal of at least one interface circuit 11. The actual speed control signal of at least one fan rotating simultaneously according to the preset program is output to the arithmetic control circuit 13 and compared with the speed control signal stored inside the arithmetic control circuit 13 to determine the speed detection result and to determine whether the fan meets the standard. For example, the qualified standard is speed control signal × 90% < actual speed control signal < speed control signal × 110%. Assuming the speed control signal is 7000 rpm, the measured actual speed control signal should be in the range of 6300 rpm to 7700 rpm. The fan can be judged to meet the standard. Similarly, the same operation is performed on the other fans.
[0040] According to the speed detection device 1 of this utility model embodiment, at least one interface circuit 11 is connected to at least one fan at its first end. The power control circuit 14 supplies power to at least one interface circuit 11, the speed measurement circuit 12, and the calculation control circuit 13. The speed measurement circuit 12 receives a start trigger signal, controls at least one fan to run simultaneously, and outputs a speed control signal to the calculation control circuit 13. At the same time, the actual speed control signal during the fan operation is output to the calculation control circuit 13. The calculation control circuit 13 outputs the speed detection result based on the speed control signal and the actual speed control signal. The speed detection device 1 of this utility model can connect to at least one fan at the same time, automatically test the speed of at least one fan, and detect whether the speed of at least one fan meets the product standard based on the speed test result, thus greatly improving the efficiency of speed detection.
[0041] In some embodiments, at least one interface circuit 11 includes: a filter stabilization sub-circuit, for example denoted as 111, and a drive sub-circuit, for example denoted as 112, wherein,
[0042] The first terminal of the filter stabilization sub-circuit 111 is connected to the first power input terminal 5V_2, the second terminal of the filter stabilization sub-circuit 111 is connected to the second pin of the fan, the third terminal of the filter stabilization sub-circuit 111 is connected to the power ground, and the fourth terminal of the filter stabilization sub-circuit 111 is connected to the second preset pin, i.e., pin FG1-8, of the operational control circuit 13, used to block high-frequency noise and fluctuation noise of the power supply voltage; the first terminal of the drive sub-circuit 112 is connected to one end of the speed adjustment and measurement circuit 12, the second terminal of the drive sub-circuit 112 is connected to the fan, the third terminal of the drive sub-circuit 112 is connected to one end of the speed adjustment and measurement circuit 12, and the fourth terminal of the drive sub-circuit 112 is connected to the fifth terminal of the power control circuit 14, used to receive the filtered power supply voltage corresponding to the fan's access signal, and drive the fan to run.
[0043] In this embodiment, the filter stabilization sub-circuit utilizes the AC-passing and DC-blocking characteristics of a capacitor to filter high-frequency noise in at least one interface circuit 11, making the voltage input to the fan more stable; the drive sub-circuit 112 limits the fan's operating current to prevent excessive current from damaging the fan or the circuit.
[0044] In some embodiments, the filter stabilization sub-circuit 111 includes: a first resistor, for example denoted as R8; a second resistor, for example denoted as R12; a first capacitor, for example denoted as C12; and a first diode, for example denoted as D3, wherein...
[0045] One end of the first resistor R8 is connected to the first power input terminal 5V_2, and the other end of the first resistor R8 is connected to the first pin (pin 2) of the fan; one end of the second resistor R12 is connected to the second preset pin (pin FG1) of the operational control circuit 13, and the other end of the second resistor R12 is connected to the other end of the first resistor R8; one end of the first capacitor C12 is connected to the other end of the first resistor R8, and the other end of the first capacitor C12 is connected to the power ground; the cathode of the first diode D3 is connected to the other end of the first resistor R8, and the anode of the first diode D3 is connected to the power ground. The filter stabilization sub-circuit 111 filters high-frequency noise in at least one interface circuit 11, making the voltage input to the fan more stable.
[0046] In some embodiments, the driving sub-circuit 112 includes: a third resistor, for example denoted as R52, and a second capacitor, for example denoted as C13, wherein,
[0047] One end of the third resistor R52 is connected to one end of the speed control module, and the other end of the third resistor R52 is connected to the second pin (pin 1) of the fan; one end of the second capacitor C13 is connected to the third pin (pin 3) of the fan, and the other end of the second capacitor C13 is connected to the fifth terminal of the power control circuit 14. The driver sub-circuit 112 limits the operating current of the fan to prevent excessive current from damaging the fan or the circuit.
[0048] In some embodiments, the speed measurement circuit 12 includes: a fourth resistor, for example R11; a first transistor, for example Q2; a fifth resistor, for example R10; a sixth resistor, for example R15; a third capacitor, for example C16; and a seventh resistor, for example R19, wherein...
[0049] One end of the fourth resistor R11 is connected to the first power input terminal 5V_2; the collector of the first transistor Q2 is connected to the other end of the fourth resistor R11 and the third terminal of at least one interface circuit 11, and the emitter of the first transistor Q2 is connected to the power ground; one end of the fifth resistor R10 is connected to one end of the fourth resistor R11 and the first power input terminal 5V_2, and the other end of the fifth resistor R10 is connected to the first preset pin, i.e., pin 43, of the operational control circuit 13; one end of the sixth resistor R15 is connected to the other end of the fifth resistor R10, and the other end of the sixth resistor R15 is connected to the base of the first transistor Q2; one end of the third capacitor C16 is connected to the other end of the sixth resistor R15, and the other end of the third capacitor C16 is connected to the power ground; one end of the seventh resistor R19 is connected to one end of the third capacitor C16, and the other end of the seventh resistor R19 is connected to the power ground. The speed control circuit 12 receives the start trigger signal to control at least one fan to operate simultaneously according to a preset program.
[0050] In some embodiments, the power control circuit 14 includes: a power input sub-circuit, for example denoted as 141; a first power output circuit, for example denoted as 142; a second power output circuit, for example denoted as 143; and a power drive circuit, for example denoted as 144, wherein...
[0051] The first terminal of the power input sub-circuit 141 is connected to the DC power input interface, and the fourth terminal of the power input sub-circuit 141 is connected to the third preset pin, i.e., pin 24, of the arithmetic control circuit 13 for receiving electrical energy. One end of the first power output circuit 142 is connected to the second terminal of the power input sub-circuit 141, and the other end of the first power output circuit 142 is connected to the first power input terminal 5V_2 of the display circuit 16 for receiving electrical energy and outputting the first supply voltage to the display circuit 16. One end of the second power output circuit 143 is connected to the third terminal of the power input sub-circuit 141, and the other end of the second power output circuit 143 is connected to the third terminal of the power input sub-circuit 141. The first power input terminal 5V_2 of the power drive circuit 144 is connected to at least one interface circuit 11, speed control circuit 12 and operation control circuit 13. It is used to receive electrical energy and output a second power supply voltage to at least one interface circuit 11, speed control circuit 12 and operation control circuit 13. The first terminal of the power drive circuit 144 is connected to the fourth preset pin, i.e. the fourth pin, of the operation control circuit 13. The second terminal of the power drive circuit 144 is connected to the high voltage power supply 12V. The third terminal of the power drive circuit 144 is connected to the second terminal of at least one interface module. It is used to turn on or off the power supply path of the high voltage power supply 12V and at least one interface module 11.
[0052] In this embodiment, the low-voltage power supply is connected to the power control circuit 14 through the DC power input interface, namely the DC1 interface. The power control circuit 14 provides 12V power to the speed detection device 1. After receiving the 12V power, the power input sub-circuit 141 outputs it to the first power output circuit 142 and the second power output circuit 143. After receiving the 12V power, the first power output circuit 142 outputs it to the first power input terminal 5V_2 of the display circuit 16 to power the display circuit. After receiving the 12V power, the second power output circuit 143 outputs it to the first power input terminal 5V_2 of at least one interface circuit 11, the speed adjustment and measurement circuit 12, and the operation and control circuit 13 to power at least one interface circuit 11, the speed adjustment and measurement circuit 12, and the operation and control circuit 13.
[0053] In some embodiments, the speed detection device 1 further includes: at least one alarm circuit 15, the first power input terminal 5V_2 of the at least one alarm circuit 15 is connected to the third terminal of the power control circuit 14, one end of the at least one alarm circuit 15 is connected to a plurality of fourth preset pins of the operation control circuit 13, namely pin 1, pin 3, pin 47, pin 45, pin 2, pin 48, pin 46, and pin 44, and the other end of the at least one alarm circuit 15 is connected to the fifth preset pin of the operation control circuit 13, namely pin 42, for receiving abnormal information of at least one fan speed, considering that one of the exhaust fans has exceeded the standard, and issuing a corresponding alarm prompt, for example, if the fan connected to the FAN1 terminal exceeds the preset range, controlling the corresponding LED1 to flash, and BUZZER1 to emit an alarm sound to prompt the tester.
[0054] In some embodiments, the speed detection device 1 further includes: a display circuit 16, the second power input terminal 5V_1 of the display circuit 16 is connected to the second terminal of the power control circuit 14, the first terminal of the display circuit 16 is connected to the sixth preset pin, i.e., the 18th pin, of the arithmetic control circuit 13, the second terminal of the display circuit 16 is connected to the seventh preset pin, i.e., the 17th pin, of the arithmetic control circuit 13, and the third terminal of the display circuit 16 is connected to the display screen circuit of the speed detection device 1, for displaying the speed of at least one fan. The display screen circuit displays the test status information of the fan. After power is supplied, the display screen lights up, displaying the current speed and status of at least one fan, as well as a touch button to start the test. Clicking the touch button controls the speed detection device 1 to start or pause the measurement.
[0055] In some embodiments, the speed detection device 1 further includes a housing for protecting the control circuit and the display screen from damage.
[0056] In some embodiments, at least one alarm circuit 15 includes: an eighth resistor R48, a first LED LED8, a buzzer 1, a second transistor Q4, a fourth capacitor C20, a ninth resistor R27, a tenth resistor R21, a fifth capacitor C11, a second diode D2, and a sixth capacitor C10, wherein...
[0057] One end of the eighth resistor R48 is connected to the first power input terminal 5V_2; one end of the first LED LED8 is connected to the other end of the eighth resistor R48, and the other end of the first LED LED8 is connected to the fourth preset pin, i.e., pin 44, of the operational control circuit 13; one end of the buzzer BUZZER1 is connected to the first power input terminal 5V_2; the collector of the second transistor Q4 is connected to the other end of the buzzer BUZZER1, and the emitter of the second transistor Q4 is connected to the power ground; one end of the fourth capacitor C20 is connected to the emitter of the second transistor Q4, and the other end of the fourth capacitor C20 is connected to the base of the second transistor Q4; one end of the ninth resistor R27 is connected to the base of the ninth resistor R27. Connect one end of the fourth capacitor C20, and connect the other end of the ninth resistor R27 to the other end of the fourth capacitor C20; connect one end of the tenth resistor R21 to the base of the second transistor Q4, and connect the other end of the tenth resistor R21 to the fifth preset pin, i.e., pin 42, of the operational control circuit 13; connect one end of the fifth capacitor C11 to the first power input terminal 5V_2, and connect the other end of the fifth capacitor C11 to the relay electrode of the second transistor Q4; connect the cathode of the second diode D2 to the first power input terminal 5V_2, and connect the anode of the second diode D2 to the relay electrode of the second transistor Q4; connect one end of the sixth capacitor C10 to the first power input terminal 5V_2, and connect the other end of the sixth capacitor C10 to the power ground. When at least one alarm circuit 15 receives abnormal information about the speed of at least one fan, it considers that one of the exhaust fans has exceeded the standard and issues a corresponding alarm prompt. For example, if the fan connected to the FAN1 terminal exceeds the preset range, it controls the corresponding LED1 to flash and BUZZER1 to emit an alarm sound to prompt the tester.
[0058] In some embodiments, the display circuit 16 includes: an eleventh resistor R17, a twelfth resistor R18, a seventh capacitor C19, an eighth capacitor C17, and a ninth capacitor C18, wherein...
[0059] One end of the eleventh resistor R17 is connected to the seventh preset pin (pin 17) of the operation control circuit 13, and the other end of the eleventh resistor R17 is connected to the second pin of the display circuit. One end of the twelfth resistor R18 is connected to the sixth preset pin (pin 18) of the operation control circuit 13, and the other end of the twelfth resistor is connected to the third pin of the display circuit. One end of the seventh capacitor C19 is connected to the seventh preset pin (pin 17) of the operation control circuit 13, and the other end of the seventh capacitor C19 is connected to the power supply ground. One end of the eighth capacitor C17 is connected to the other end of the twelfth resistor R18, and the other end of the eighth capacitor C17 is connected to the power supply ground. One end of the ninth capacitor C18 is connected to the second power input terminal 5V_2, and the other end of the ninth capacitor C18 is connected to the power supply ground. The display circuit 16 displays the speed of at least one fan, and the display circuit displays the fan's test status information. After power is supplied, the display lights up, showing the current speed and status of at least one fan, as well as a touch button to start the test. Clicking the touch button controls the speed detection device 1 to start or pause the measurement.
[0060] In some embodiments, the power input sub-circuit 141 includes: a third diode D1, a first electrolytic capacitor CE1, a tenth capacitor C2, a thirteenth resistor R2, a second LED LED9, a fourteenth resistor R3, a fifteenth resistor R4, an eleventh capacitor C6, a sixteenth resistor R6, a seventeenth resistor R7J1, a second electrolytic capacitor CE3, a twelfth capacitor C3, and a thirteenth capacitor C4, wherein...
[0061] The third diode D1 has one end connected to the first pin of the DC power input interface and the 12V high-voltage power supply, and the other end connected to the second and third pins of the DC power input interface and analog ground; the first electrolytic capacitor CE1 has one end connected to one end of the third diode D1, and the other end connected to the other end of the third diode D1; the tenth capacitor C2 has one end connected to one end of the first electrolytic capacitor CE1, and the other end connected to the other end of the first electrolytic capacitor CE1; the thirteenth resistor R2 has one end connected to one end of the tenth capacitor C2; the second LED LED9 has one end connected to the other end of the thirteenth resistor R2, and the other end connected to the other end of the tenth capacitor C2; the fourteenth resistor R3 has one end connected to one end of the tenth capacitor C2; and the fifteenth resistor R4 has one end connected to... The other end of the fourteenth resistor R3 and the other end of the fifteenth resistor R4 are connected to the third preset pin, i.e., pin 24, of the operational control circuit 13; the eleventh capacitor C6 has one end connected to the other end of the fifteenth resistor R4, and the other end of the eleventh capacitor C6 is connected to the power supply ground; the sixteenth resistor R6 has one end connected to the other end of the fourteenth resistor R3; the seventeenth resistor R7J1 has one end connected to the other end of the sixteenth resistor R6; the second electrolytic capacitor CE3 has one end connected to one end of the fourteenth resistor R3, and the other end of the second electrolytic capacitor CE3 is connected to the other end of the seventeenth resistor R7J1; the twelfth capacitor C3 has one end connected to one end of the second electrolytic capacitor CE3, and the other end of the twelfth capacitor C3 is connected to the other end of the second electrolytic capacitor CE3; the thirteenth capacitor C4 has one end connected to one end of the twelfth capacitor C3, and the other end of the thirteenth capacitor C4 is connected to the other end of the twelfth capacitor C3. The power input sub-circuit 141 receives electrical energy output from the DC power input interface.
[0062] In some embodiments, the first power output circuit 142 includes: a first chip U1, an eighteenth resistor R5, a first inductor L1, a fourteenth capacitor C5, a third electrolytic capacitor CE2, a nineteenth resistor R1, and a fifteenth capacitor C1, wherein...
[0063] The first chip U1 has its first pin (VIN) connected to one end of the seventh capacitor, and its second pin (GND) connected to the other end of the seventeenth resistor R7J1. The third pin (EN / OUT) of the first chip U1 is unconnected. The eighteenth resistor R5 has one end connected to the fourth pin of the first chip U1. The first inductor L1 has one end connected to the other end of the eighteenth resistor R5, and the other end connected to the fifth pin (SW) of the first chip U1. The fourteenth capacitor C5 has one end connected to the other end of the first inductor L1 and the first power output terminal, and the other end connected to power ground. The third electrolytic capacitor CE2 has one end connected to the first power output terminal, and the other end connected to power ground. The nineteenth resistor R1 has one end connected to the fifth pin (SW) of the first chip U1. The fifteenth capacitor C1 has one end connected to the other end of the nineteenth resistor R1, and the other end connected to power ground. After receiving the electrical energy output from the power input sub-circuit 141, the first power output circuit 142 outputs the first power supply voltage to the display circuit 16 to power the display circuit 16.
[0064] In some embodiments, the second power output circuit 143 includes: a voltage regulator LDO1, a sixteenth capacitor C7, a seventeenth capacitor C8, a fourth electrolytic capacitor CE5, and a twentieth resistor R9, wherein...
[0065] Voltage regulator LDO1: The first pin (IN pin) of voltage regulator LDO1 is connected to one end of the fourteenth resistor R3; the second pin (GND pin) of voltage regulator LDO1 is connected to power ground; the third pin (OUT pin) of voltage regulator LDO1 is connected to the first power input terminal 5V_2. Sixteenth capacitor C7: One end of sixteenth capacitor C7 is connected to the first pin (IN pin) of voltage regulator; the other end of sixteenth capacitor C7 is connected to the other end of the seventeenth resistor R7J1 and power ground. Seventeenth capacitor C8: One end of seventeenth capacitor C8 is connected to one end of sixteenth capacitor C7; the other end of seventeenth capacitor C8 is connected to one end of sixteenth capacitor C7. Fourth electrolytic capacitor CE5: One end of fourth electrolytic capacitor CE5 is connected to the third pin (OUT pin) of voltage regulator and the first power input terminal 5V_2; the other end of fourth electrolytic capacitor CE5 is connected to power ground. Twentieth resistor R9: One end of twentieth resistor R9 is connected to one end of fourth electrolytic capacitor CE5; the other end of twentieth resistor R9 is connected to power ground. After receiving the electrical energy output from the power input sub-circuit 141, the second power output circuit 143 outputs a second power supply voltage to at least one interface circuit 11, speed control circuit 12, and arithmetic control circuit 13 to supply power to at least one interface circuit 11, speed control circuit 12, and arithmetic control circuit 13.
[0066] In some embodiments, the power drive circuit 144 includes: a twenty-first resistor R20, a twenty-second resistor R24, a second transistor Q3, a twenty-third resistor R16, a twenty-fourth resistor R14, and a first switching transistor Q1, wherein...
[0067] The 21st resistor R20 has one end connected to the fourth preset pin (pin 4) of the operational control circuit 13; the 22nd resistor R24 has one end connected to the other end of the 21st resistor R20, and the other end of the 22nd resistor R24 is connected to analog ground; the base of the second transistor Q3 is connected to the other end of the 21st resistor R20, and the emitter of the second transistor Q3 is connected to analog ground; the 23rd resistor R16 has one end connected to the collector of the second transistor Q3; the 24th resistor R14 has one end connected to the other end of the 23rd resistor R16, and the other end of the 24th resistor R14 is connected to the high-voltage power supply 12V; the first switch Q1 has its first end connected to the other end of the 23rd resistor R16, its second end connected to the other end of the 24th resistor R14, and its third end connected to the other end of the second capacitor C13 and the fourth pin of the fan. The power drive circuit 144 controls the power supply of the high voltage power supply 12V and at least one interface module 11 by turning on or off the first switch Q1, thereby enabling the high voltage power supply 12V to control the power supply of at least one interface circuit 11 and the corresponding fans FAN1-FAN8.
[0068] According to the speed detection device 1 of this utility model embodiment, at least one interface circuit 11 is connected to at least one fan at its first end. The power control circuit 14 supplies power to at least one interface circuit 11, the speed measurement circuit 12, and the calculation control circuit 13. The speed measurement circuit 12 receives a start trigger signal, controls at least one fan to run simultaneously, and outputs a speed control signal to the calculation control circuit 13. At the same time, the actual speed control signal during the fan operation is output to the calculation control circuit 13. The calculation control circuit 13 outputs the speed detection result based on the speed control signal and the actual speed control signal. The speed detection device 1 of this utility model can connect to at least one fan at the same time, automatically test the speed of at least one fan, and detect whether the speed of at least one fan meets the product standard based on the speed test result, thus greatly improving the efficiency of speed detection.
[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.
[0070] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A speed detection device, characterized in that, include: At least one interface circuit, wherein the first end of the at least one interface circuit is connected to at least one fan, for receiving an access signal from at least one fan and driving the fan to operate; A speed control circuit, one end of which is connected to at least one third terminal of the interface circuit, is used to receive a start trigger signal and output a speed control signal. The operation control circuit has a first preset pin connected to the other end of the speed measurement circuit, and multiple second preset pins of the operation control circuit connected to at least one fourth end of the interface circuit, for receiving the speed control signal and the actual speed control signal of the fan, and outputting the speed detection result; The power control circuit has a first terminal connected to a DC power input interface, a third terminal connected to the first power input terminal of at least one interface circuit, the speed adjustment and measurement circuit, and the arithmetic control circuit, a fourth terminal connected to the third preset pin of the arithmetic control circuit, a fifth terminal connected to the fourth preset pin of the arithmetic control circuit, and a sixth terminal connected to the second terminal of at least one interface module for outputting a power supply voltage to power at least one interface circuit, the speed adjustment and measurement circuit, and the arithmetic control circuit.
2. The rotational speed detection device according to claim 1, characterized in that... At least one of the interface circuits, comprising: A filtering and stabilizing sub-circuit is provided, wherein the first terminal of the filtering and stabilizing sub-circuit is connected to the first power input terminal, the second terminal of the filtering and stabilizing sub-circuit is connected to the second pin of the fan, the third terminal of the filtering and stabilizing sub-circuit is connected to the power ground, and the fourth terminal of the filtering and stabilizing sub-circuit is connected to the second preset pin of the operation and control circuit, which is used to block high-frequency noise and fluctuation noise of the power supply voltage. The driving sub-circuit has a first terminal connected to one terminal of the speed control circuit, a second terminal connected to the fan, a third terminal connected to one terminal of the speed control circuit, and a fourth terminal connected to the fifth terminal of the power control circuit. It is used to receive the filtered power supply voltage corresponding to the fan's access signal and drive the fan to operate.
3. The rotational speed detection device according to claim 2, characterized in that, The filter stabilization sub-circuit includes: A first resistor, one end of which is connected to the first power input terminal, and the other end of which is connected to the first pin of the fan; The second resistor has one end connected to the second preset pin of the operation control circuit, and the other end connected to the other end of the first resistor. A first capacitor, one end of which is connected to the other end of the first resistor, and the other end of which is connected to the power supply ground; The cathode of the first diode is connected to the other end of the first resistor, and the anode of the first diode is connected to the power supply ground.
4. The rotational speed detection device according to claim 2, characterized in that, The driving sub-circuit includes: The third resistor has one end connected to one end of the speed control module and the other end connected to the second pin of the fan. The second capacitor has one end connected to the third pin of the fan and the other end connected to the fifth pin of the power control circuit.
5. The rotational speed detection device according to claim 1, characterized in that, The speed control circuit includes: A fourth resistor, one end of which is connected to the first power input terminal; The first transistor has its collector connected to the other end of the fourth resistor and at least one third terminal of the interface circuit, and its emitter connected to the power supply ground. The fifth resistor has one end connected to one end of the fourth resistor and the first power input terminal, and the other end connected to the first preset pin of the operation control circuit. A sixth resistor, one end of which is connected to the other end of the fifth resistor, and the other end of which is connected to the base of the first transistor; The third capacitor has one end connected to the other end of the sixth resistor, and the other end of the third capacitor is connected to the power supply ground. The seventh resistor has one end connected to one end of the third capacitor and the other end connected to the power supply ground.
6. The rotational speed detection device according to claim 1, characterized in that, The power control circuit includes: A power input sub-circuit, wherein the first end of the power input sub-circuit is connected to the DC power input interface, and the fourth end of the power input sub-circuit is connected to the third preset pin of the operation control circuit for receiving electrical energy; A first power output circuit, one end of which is connected to the second end of the power input sub-circuit, and the other end of which is connected to the first power input terminal of the display circuit, is used to receive the electrical energy and output a first power supply voltage to the display circuit. The second power output circuit has one end connected to the third end of the power input sub-circuit, and the other end connected to the first power input terminal of at least one of the interface circuits, the speed adjustment circuit, and the operation control circuit. It is used to receive the electrical energy and output a second power supply voltage to at least one of the interface circuits, the speed adjustment circuit, and the operation control circuit. A power drive circuit, wherein the first end of the power drive circuit is connected to the fourth preset pin of the operation control circuit, the second end of the power drive circuit is connected to a high voltage power supply, and the third end of the power drive circuit is connected to the second end of at least one of the interface modules, for turning on or off the power supply path of the high voltage power supply and at least one of the interface modules.
7. The rotational speed detection device according to claim 1, characterized in that, The rotational speed detection device also includes: At least one alarm circuit is provided, wherein a first power input terminal of the at least one alarm circuit is connected to a third terminal of the power control circuit, one end of the at least one alarm circuit is connected to a plurality of fourth preset pins of the arithmetic control circuit, and the other end of the at least one alarm circuit is connected to a fifth preset pin of the arithmetic control circuit, for issuing an alarm prompt when receiving abnormal information of at least one fan speed.
8. The rotational speed detection device according to claim 1, characterized in that, The rotational speed detection device also includes: The display circuit has a second power input terminal connected to the second terminal of the power control circuit, a first terminal connected to the sixth preset pin of the arithmetic control circuit, a second terminal connected to the seventh preset pin of the arithmetic control circuit, and a third terminal connected to the display screen circuit of the speed detection device, for displaying the speed of at least one of the fans.
9. The rotational speed detection device according to claim 7, characterized in that, At least one of the alarm circuits includes: The eighth resistor, one end of which is connected to the first power input terminal; The first LED light has one end connected to the other end of the eighth resistor, and the other end of the first LED light is connected to the fourth preset pin of the operation control circuit. A buzzer, one end of which is connected to a first power input terminal; The collector of the second transistor is connected to the other end of the buzzer, and the emitter of the second transistor is connected to the power supply ground. A fourth capacitor, one end of which is connected to the emitter of the second transistor, and the other end of which is connected to the base of the second transistor; A ninth resistor, one end of which is connected to one end of the fourth capacitor, and the other end of which is connected to the other end of the fourth capacitor; The tenth resistor has one end connected to the base of the second transistor and the other end connected to the fifth preset pin of the operational control circuit. The fifth capacitor has one end connected to the first power input terminal and the other end connected to the relay electrode of the second transistor. The second diode has its cathode connected to the first power input terminal and its anode connected to the relay electrode of the second transistor. The sixth capacitor has one end connected to the first power input terminal and the other end connected to the power ground.
10. The rotational speed detection device according to claim 8, characterized in that, The display circuit includes: The eleventh resistor has one end connected to the seventh preset pin of the operation control circuit and the other end connected to the second pin of the display circuit. The twelfth resistor has one end connected to the sixth preset pin of the operation control circuit and the other end connected to the third pin of the display circuit. The seventh capacitor has one end connected to the seventh preset pin of the operation control circuit, and the other end connected to the power ground. The eighth capacitor has one end connected to the other end of the twelfth resistor, and the other end of the eighth capacitor is connected to the power supply ground. The ninth capacitor has one end connected to the second power input terminal and the other end connected to the power ground.