CN216080265U - Fan drive circuit, indoor unit and air conditioner - Google Patents
Fan drive circuit, indoor unit and air conditioner Download PDFInfo
- Publication number
- CN216080265U CN216080265U CN202121449205.XU CN202121449205U CN216080265U CN 216080265 U CN216080265 U CN 216080265U CN 202121449205 U CN202121449205 U CN 202121449205U CN 216080265 U CN216080265 U CN 216080265U
- Authority
- CN
- China
- Prior art keywords
- resistor
- fan
- capacitor
- triode
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Control Of Electric Motors In General (AREA)
- Control Of Direct Current Motors (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The utility model provides a fan driving circuit, an indoor unit and an air conditioner, wherein the circuit comprises: the circuit comprises a connector, a first resistor, a second resistor, a third resistor, a first power supply voltage, a second power supply voltage, a triode and a first capacitor; the first power supply voltage is connected with the base electrode of the triode through a first resistor, and the base electrode is also connected with a fan rotating speed control terminal; the second power supply voltage is connected with a collector of the triode, and an emitter of the triode is grounded; the second resistor and the third resistor are connected in series and then are connected in parallel with a collector and an emitter of the triode; one end of the first capacitor is connected between the second resistor and the third resistor and is connected with a motor speed regulation terminal of the fan controller through a connector, and the other end of the first capacitor is grounded. According to the utility model, the pull-up resistor is arranged at the fan rotating speed control terminal and is connected with the working voltage to provide the pull-up voltage, so that the misoperation of the direct current fan can be prevented when the internal unit is powered on.
Description
Technical Field
The utility model relates to the technical field of air conditioners, in particular to a fan driving circuit, an indoor unit and an air conditioner.
Background
The power supply scheme used by the main control panel of the indoor unit of the air conditioner at present is usually a flyback switching power supply scheme, and a commonly used direct current fan driving circuit is a double-optical coupling driving circuit. The double optical coupling driving circuit has the advantages of complex circuit structure, high cost and poor reliability, so the non-optical coupling driving circuit is designed.
The non-optical coupling driving circuit does not have an optical coupler to carry out circuit isolation, when the internal machine is electrified, the power supply voltage of the circuit charges the capacitor, and the capacitor voltage is larger than the threshold voltage of the motor operation, so that the direct current fan of the internal machine can generate misoperation.
SUMMERY OF THE UTILITY MODEL
The utility model solves the problem that the traditional fan driving circuit causes the misoperation of a direct current fan of an inner machine.
In order to solve the above problems, the present invention provides a fan driving circuit, which includes a connector, a first resistor, a second resistor, a third resistor, a first power supply voltage, a second power supply voltage, a triode, and a first capacitor; the first power supply voltage is connected with the base electrode of the triode through a first resistor, and the base electrode is also connected with a fan rotating speed control terminal; the second power supply voltage is connected with a collector of the triode, and an emitter of the triode is grounded; the second resistor and the third resistor are connected in series and then are connected in parallel with a collector and an emitter of the triode; one end of the first capacitor is connected with the second resistor and the third resistor, and is connected with a motor speed regulation terminal of the fan controller through a connector, and the other end of the first capacitor is grounded.
According to the fan driving circuit provided by the utility model, the pull-up resistor is arranged at the fan rotating speed control terminal and is connected with the working voltage to provide the pull-up voltage, so that the misoperation of the direct current fan can be prevented when the inner unit is powered on.
Optionally, a diode is also included; the anode of the diode is connected with the bus voltage, and the cathode of the diode supplies power to the fan through the connector.
The circuit provided by the utility model is additionally provided with the diode, so that the counter electromotive force generated by the built-in driving direct current fan can be prevented from being added to the direct current bus, and the counter electromotive force generated by the direct current fan due to the inertia rotation power generation caused by sudden power failure of the built-in driving direct current fan is prevented from acting on the main control panel of the inner machine.
Optionally, a second capacitor is further included; the second capacitor is connected in parallel with the first capacitor.
The circuit provided by the utility model is provided with the second capacitor, noise waves can be filtered, and the cleanness of a power supply or the cleanness and stability of signals are ensured.
Optionally, a third capacitor is further included; one end of the third capacitor is grounded, the other end of the third capacitor is connected with a fan rotating speed feedback terminal, and the fan rotating speed feedback terminal is connected with the main controller through the connector.
The circuit provided by the utility model is provided with the third capacitor, noise waves can be filtered, and the cleanness of a power supply or the cleanness and stability of signals are ensured.
Optionally, a fourth capacitor is further included; one end of the fourth capacitor is grounded, and the other end of the fourth capacitor is connected with the cathode of the diode.
The circuit provided by the utility model is provided with the fourth capacitor, noise waves can be filtered, and the cleanness of a power supply or the cleanness and stability of signals are ensured.
Optionally, a fourth resistor is further included; the fourth resistor is connected between the base and the fan rotating speed control terminal.
Optionally, a fifth resistor is further included; one end of the fifth resistor is connected with the base electrode, and the other end of the fifth resistor is grounded.
Optionally, a sixth resistor is further included; the sixth resistor is connected between the second supply voltage and the collector.
The circuit provided by the utility model is provided with the fourth resistor, the fifth resistor and the sixth resistor, and has the functions of voltage reduction and current limitation.
The utility model provides an indoor unit which is characterized by comprising the fan driving circuit.
The utility model provides an air conditioner which is characterized by comprising the indoor unit.
The indoor unit and the air conditioner provided by the utility model can achieve the same technical effect as the fan driving circuit.
Drawings
Fig. 1 is a schematic structural diagram of a conventional dc fan driving circuit;
fig. 2 is a schematic structural diagram of a fan driving circuit according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a schematic structural diagram of a conventional dc fan driving circuit, which adopts a double-optical coupling driving circuit scheme.
Specifically, a DC-M needle seat on an inner machine control board is connected with a direct current fan, and a power supply DC + (310V) on the control board is transmitted to the direct current fan through a pin 1 of the DC-M needle seat to supply power to an armature winding; the ground GND1 of the internal machine control board is connected with the controller ground built in the direct current fan through the 3-pin of the DC-M pin base; transmitting the +15V of the power supply of the control panel of the inner machine to the direct current fan through 4 pins of the DC-M pin seat to supply power to VCC of a built-in controller of the direct current fan; the pin 5 of the DC-M needle seat is connected with a VSP pin on a controller built in the DC fan, and the rotation speed of the DC fan can be adjusted by adjusting the voltage value of the VSP pin, that is, the voltage value of the VSP pin for controlling the rotation speed of the DC fan and the rotation speed are in a linear correspondence, such as the following table (the correspondence in the table is not fixed and is different from motor):
the voltage value of the VSP pin (VSP voltage for short) is adjusted through the duty ratio of a fan rotating speed PWM control signal, the fan rotating speed PWM control signal sent out from the main control MCU controls the on and off of the optical coupler IC2 through the resistors R8, Q1 and R7, when the PWM control signal outputs high level, the Q1 is conducted, so that the optical coupler is conducted, then +15V passes through the optical coupler IC2, and then passes through the resistors R4 and R3 to the ground GND1, so that the electrolytic capacitor E1 is charged, the voltage values at two ends of the electrolytic capacitor E1 are the voltage value of the VSP pin, and therefore the rotating speed of the direct current fan can be changed by changing the duty ratio of the fan rotating speed PWM control signal.
Signals fed back by the rotating speed of the direct current fan are fed back to the main control MCU through the 6 pins of the DC-M needle seat by the optical coupler IC1, and the rotating speed of the fan is fed back to the port.
However, the above dc fan driving circuit has the following disadvantages:
(1) when the inner machine is powered on, the power supply voltage charges the electrolytic capacitor E1, and when the voltage of the electrolytic capacitor is larger than the threshold voltage of the motor operation, the direct current fan of the inner machine can generate misoperation.
(2) The circuit structure is complicated, and uses two opto-couplers, and the cost is higher, and components and parts are more, and production efficiency reduces, and the reliability also reduces.
(3) If the direct current fan is suddenly powered off when the direct current fan runs at a wind gear with higher rotating speed, the direct current fan is an inductive load, an armature winding is arranged in the direct current fan, due to the action of inertia, after the bus voltage DC + is reduced from 310V to 0V, due to inertia, the armature winding still generates back electromotive force and is added on the bus voltage DC + again, the higher the rotating speed before power off is, the generated back electromotive force is higher, the direct current fan driving circuit cannot prevent the back electromotive force generated by the motor from being added on the bus, if the voltage value exceeds an undervoltage threshold value of a flyback switching power supply chip, the switching power supply can work again for a short time, a display panel is likely to be suddenly lightened, a buzzer sounds lightly, and a relay sounds in suction, although the controller cannot be substantially damaged, a user is likely to generate confusion and complaint.
The embodiment of the utility model redesigns a fan driving circuit which prevents the false action of a wind turbine, has no optical coupler and prevents the back electromotive force of a built-in driving direct current fan, and the circuit is simple, has no optical coupler, reliable speed regulation, low cost, relatively few devices and high production efficiency.
The fan driving circuit comprises a connector DC-M, a first resistor R1, a second resistor R2, a third resistor R3, a first power supply voltage (+5V), a second power supply voltage (+15V), a triode Q1 and a first capacitor E1;
the first power supply voltage is connected with the base electrode of the triode Q1 through a first resistor R1, and the base electrode is also connected with a fan rotating speed control terminal; the transistor Q1 is equal to a switch and plays the roles of opening and closing;
the second power supply voltage is connected with a collector of a triode Q1, and an emitter of a triode Q1 is grounded;
the second resistor R2 and the third resistor R3 are connected in series and then are connected in parallel with the collector and the emitter of the triode Q1;
one end of the first capacitor E1 is connected between the second resistor R2 and the third resistor R3, and is connected with the motor speed regulation terminal of the fan controller through the connector DC-M, and the other end is grounded.
The fan drive circuit that this embodiment provided sets up pull-up resistance in fan rotational speed control terminal department, and this pull-up resistance is connected in order to provide pull-up voltage with operating voltage, can prevent the direct current fan malfunction when the interior machine is electrified.
Fig. 2 is a schematic structural diagram of the fan driving circuit of the present invention, and the main control MCU is connected to the fan driving circuit through a fan rotation speed control terminal, and the connector DC-M is taken as a pin socket connector for explanation. Also shown in fig. 2 are capacitors C2, C3, C4, which act as a filter, and a first capacitor E1, which acts as a filter and an energy storage.
As shown in fig. 2, the wind turbine further comprises a diode D1, wherein the anode of the diode D1 is connected with the bus voltage DC +, and the cathode of the diode D1 supplies power to the wind turbine through a connector DC-M.
Diode D1 can prevent that the back electromotive force that built-in drive direct current fan produced from adding on direct current bus DC + to prevent that built-in drive direct current fan from because of the outage suddenly, direct current fan is because of the inertia rotation electricity generation, and the back electromotive force that produces acts on interior machine main control board.
Also shown in fig. 2 are a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. The second capacitor C2 is connected in parallel with the first capacitor E1, one end of the third capacitor C3 is grounded, the other end of the third capacitor C3 is connected with a fan rotating speed feedback terminal, the fan rotating speed feedback terminal is connected with a fan controller through a connector DC-M, one end of the fourth capacitor C4 is grounded, and the other end of the fourth capacitor C4 is connected with the negative electrode of the diode D1.
Fig. 2 also shows a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, the fourth resistor R4 is connected between the base and the fan speed control terminal, one end of the fifth resistor R5 is connected with the base, the other end is grounded, and the sixth resistor R6 is connected between the second supply voltage (+15V) and the collector.
Also shown in fig. 2 are a seventh resistor R7, an eighth resistor R8, R7 disposed between pin 6 and +5V, and R8 disposed between pin 6 and the fan speed feedback terminal.
The control logic of the fan drive circuit is described below.
When the fan rotating speed control terminal outputs a high level, the triode Q1 is conducted, and the VSP of the direct current fan is not charged at the moment; when the fan speed control terminal outputs a low level, the triode Q1 is not conducted, and the VSP of the direct current fan is charged at the moment. Therefore, the voltage value (VSP voltage for short) of the VSP pin for controlling the rotating speed of the direct current fan can be adjusted by adjusting the duty ratio of the PWM control signal of the rotating speed of the fan, so that the rotating speed is adjusted.
After the air conditioner is started, a user presses a remote controller (such as high-wind-level refrigeration), a power supply starts to be established, firstly DC + (310V), then +15V, +12V, +5V, and three weak currents start to have output voltages, but the time differences of the three voltages which start to be established are not large.
At this time, during the process of +15V establishment (i.e. during the process of 0V rising to 15V), the electrolytic capacitor E1 starts to charge, i.e. the VSP pin starts to charge, but the charging time is short, because later +5V starts to charge during the establishment (i.e. during the process of 0V rising to 5V), the voltage goes through R6, R2, R3 to ground GND, when the voltage reaches a certain voltage value, the transistor Q1 is turned on, here +15V goes through R6, Q1 to ground GND, thus short-circuiting R2 and R3, and the current only flows from R6 and Q1 to ground GND, thus preventing 15V from continuing to charge the VSP pin, which far reaches the threshold voltage of motor operation (generally about 2.3V), and the motor will not operate. If the circuit is designed, the pull-up resistor R1 is not added to 5V, and the direct current fan has the hidden trouble that the internal unit can be operated when being electrified.
After voltages of +15V, +12V, +5V are established, a main chip MCU sends a fan rotating speed PWM control signal according to a proper duty ratio, then the voltage of 15V charges an electrolytic capacitor E1, the VSP voltage starts to rise, a fan starts to rotate, the actual rotating speed feeds back a PWM pulse signal through a feedback circuit, the main chip receives the PWM pulse signal fed back by the fan rotating speed, an internal program calculates a target rotating speed value and an actual rotating speed value through comparison, and then the duty ratio is adjusted in real time according to the program logic designed by the chip so as to adjust the VSP voltage value, and therefore the rotating speed is adjusted to reach the target rotating speed.
The fan drive circuit who does not have the opto-coupler, prevent built-in drive direct current fan back electromotive force that this embodiment provided replaces two opto-couplers with a triode, and the circuit is simplified, and cost reduction, the speed governing is reliable accurate, and this circuit device is less, and production efficiency improves.
This circuit can prevent that built-in drive direct current fan from rotating the electricity generation because of inertia always because of cutting off the power supply suddenly through increasing the diode, and the back electromotive force of production acts on interior quick-witted main control panel for the power can work very short time again, probably can lead to the display panel to light suddenly, the buzzer buzz a sound, the hidden danger of the actuation of relay.
Noise waves are filtered by adding filtering capacitors C2, C3 and C4, so that the power supply is clean or signals received by the MCU of the main chip are clean and stable.
The circuit can avoid the problem that the direct current fan on the first inner machine can operate by misoperation in a mode of connecting a pull voltage on the fan rotating speed control port through a resistor.
The embodiment of the utility model also provides an indoor unit which comprises the fan driving circuit.
The embodiment of the utility model also provides an air conditioner which comprises the indoor unit.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (10)
1. A fan drive circuit, comprising: the circuit comprises a connector, a first resistor, a second resistor, a third resistor, a first power supply voltage, a second power supply voltage, a triode and a first capacitor;
the first power supply voltage is connected with the base electrode of the triode through a first resistor, and the base electrode is also connected with a fan rotating speed control terminal;
the second power supply voltage is connected with a collector of the triode, and an emitter of the triode is grounded;
the second resistor and the third resistor are connected in series and then are connected in parallel with a collector and an emitter of the triode;
one end of the first capacitor is connected with the second resistor and the third resistor, and is connected with a motor speed regulation terminal of the fan controller through a connector, and the other end of the first capacitor is grounded.
2. The fan drive circuit of claim 1, further comprising a diode; the anode of the diode is connected with the bus voltage, and the cathode of the diode supplies power to the fan through the connector.
3. The fan drive circuit of claim 1, further comprising a second capacitor; the second capacitor is connected in parallel with the first capacitor.
4. The fan drive circuit of claim 1, further comprising a third capacitor; one end of the third capacitor is grounded, the other end of the third capacitor is connected with a fan rotating speed feedback terminal, and the fan rotating speed feedback terminal is connected with the main controller through the connector.
5. The fan drive circuit of claim 2, further comprising a fourth capacitor; one end of the fourth capacitor is grounded, and the other end of the fourth capacitor is connected with the cathode of the diode.
6. The fan drive circuit of claim 1, further comprising a fourth resistor; the fourth resistor is connected between the base and the fan rotating speed control terminal.
7. The fan drive circuit of claim 1, further comprising a fifth resistor; one end of the fifth resistor is connected with the base electrode, and the other end of the fifth resistor is grounded.
8. The fan drive circuit of claim 1, further comprising a sixth resistor; the sixth resistor is connected between the second supply voltage and the collector.
9. An indoor unit comprising the fan drive circuit according to any one of claims 1 to 8.
10. An air conditioner characterized by comprising the indoor unit according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121449205.XU CN216080265U (en) | 2021-06-28 | 2021-06-28 | Fan drive circuit, indoor unit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121449205.XU CN216080265U (en) | 2021-06-28 | 2021-06-28 | Fan drive circuit, indoor unit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216080265U true CN216080265U (en) | 2022-03-18 |
Family
ID=80664053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121449205.XU Active CN216080265U (en) | 2021-06-28 | 2021-06-28 | Fan drive circuit, indoor unit and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216080265U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116045473A (en) * | 2022-12-22 | 2023-05-02 | 珠海格力电器股份有限公司 | Air conditioner control method and device, air conditioner and storage medium |
-
2021
- 2021-06-28 CN CN202121449205.XU patent/CN216080265U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116045473A (en) * | 2022-12-22 | 2023-05-02 | 珠海格力电器股份有限公司 | Air conditioner control method and device, air conditioner and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201577051U (en) | Soft start module and motor controller starter using the same | |
| CN206932160U (en) | A kind of control circuit of motor drive power supply | |
| CN216080265U (en) | Fan drive circuit, indoor unit and air conditioner | |
| CN106597974B (en) | Control device and control method of external circuit breaker of electric energy meter | |
| CN201937530U (en) | Anti-reverse-rotation circuit of speed regulation feedback control of direct-current motor | |
| CN104122803A (en) | Solar-energy standby power supplying device | |
| CN117207779A (en) | Electric drive system and vehicle | |
| WO2023280011A1 (en) | Highly reliable sleep circuit based on frequency control | |
| CN204809563U (en) | Automatic energy -conserving socket cuts off power supply | |
| CN108683374B (en) | Excitation shaft generator system start-stop logic control circuit and excitation shaft generator system | |
| CN110539611A (en) | Vehicle-mounted outdoor unit control circuit and vehicle-mounted air conditioner | |
| CN201248023Y (en) | Control circuit for DC fan motor of outdoor unit of air conditioner | |
| CN207975006U (en) | driving circuit | |
| JP5007764B2 (en) | Motor drive system and motor system | |
| CN113103884B (en) | Wake-up signal generating circuit and vehicle charging system | |
| CN213873096U (en) | New fan switching control circuit, electric wire and new fan | |
| CN212063831U (en) | Automatic bypass circuit for power-on starting of flyback power supply | |
| CN115395496B (en) | Hard switch electric tool start-up safety protection circuit | |
| CN212969472U (en) | High-efficiency synchronous rectification module | |
| CN111049466A (en) | Anti-interference circuit, device and electrical equipment | |
| CN217087867U (en) | Voltage-reducing starting delay circuit | |
| CN215185962U (en) | Charging adjustable differential pressure activation power supply circuit | |
| CN219554646U (en) | Charging circuit | |
| CN211352038U (en) | Improved starting power supply circuit | |
| CN221448311U (en) | Heliostat motor braking circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230515 Address after: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Address before: 1001-1005, building 3, Tsinghua Science and Technology Park (Zhuhai) phase II scientific research incubation building, 101 University Road, Tangjiawan Town, high tech Zone, Zhuhai City, Guangdong Province, 519080 Patentee before: ZHUHAI TUOXIN TECHNOLOGY Co.,Ltd. Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. |
|
| TR01 | Transfer of patent right |