CN211823010U - Air conditioner drive plate temperature protection circuit and air conditioner - Google Patents
Air conditioner drive plate temperature protection circuit and air conditioner Download PDFInfo
- Publication number
- CN211823010U CN211823010U CN201922337531.0U CN201922337531U CN211823010U CN 211823010 U CN211823010 U CN 211823010U CN 201922337531 U CN201922337531 U CN 201922337531U CN 211823010 U CN211823010 U CN 211823010U
- Authority
- CN
- China
- Prior art keywords
- air conditioner
- thermistor
- resistor
- temperature protection
- resistance
- 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
Abstract
The utility model provides an air conditioner drive plate temperature protection circuit and air conditioner, air conditioner drive plate temperature protection circuit includes switching device, first resistance, the second resistance, the third resistance, fourth resistance and first thermistor, when the temperature at the power module at first thermistor place risees, first thermistor's resistance reduces, and then control switching device switches on when first thermistor's voltage reduces to the default, adjust drive control unit output drive signal, avoid the continuation rising of air conditioner drive plate temperature, it is quick to air conditioner drive plate to have realized, reliable temperature protection, can promote the real-time of air conditioner brushless motor built-in drive plate temperature protection well, and simple structure, and is with low costs, the commonality is strong.
Description
Technical Field
The utility model relates to an air conditioner technical field, in particular to air conditioner drive plate temperature protection circuit and air conditioner.
Background
In the common temperature protection of the built-in driving board of the brushless motor of the air conditioner in the prior art, the value of a temperature sensor is read by a main control chip, and the temperature protection is carried out by a software algorithm; firstly, for the application of the air conditioner, the air conditioner cannot work normally when the motor is directly stopped, and the experience brought to users is the adverse effect of product failure; secondly, software protection is carried out in the working process, certain processing algorithm time is needed, so the detected temperature cannot represent the real-time temperature, certain errors exist in temperature protection, and the temperature protection point is difficult to set; the temperature cannot be well detected when the temperature protection point is incorrect, and the other scheme is that the rotation speed of the motor is reduced along with the increase of the temperature by controlling the duty ratio of the modulation signal to be reduced.
Disclosure of Invention
An object of the utility model is to provide an air conditioner drive plate temperature protection circuit and air conditioner can realize carrying out temperature protection to the motor fast.
The embodiment of the utility model provides a first aspect provides an air conditioner drive plate temperature protection circuit, and it is connected with drive control unit, air conditioner drive plate temperature protection circuit includes switching device, first resistance, second resistance, third resistance, fourth resistance and first thermistor;
one end of the first resistor and the signal output end of the driving control unit are connected to the input end of the switch device in a sharing mode, the output end of the switch device is connected to the first end of the second resistor, the second end of the second resistor is grounded, the control end of the switch device is connected to the first end of the third resistor, the second end of the third resistor and the first end of the fourth resistor are connected to the first end of the first thermistor in a sharing mode, the second end of the fourth resistor is connected to the power supply voltage, and the second end of the first thermistor is grounded.
Further, the switching device is a PNP triode, and a base electrode, a collector electrode and an emitter electrode of the PNP triode are respectively a control end, an input end and an output end of the switching device.
Further, the first thermistor is an NTC thermistor.
Further, the air conditioner drive plate temperature protection circuit further comprises a second thermistor, a capacitor and a test resistor, wherein a first voltage output end of the drive control unit is connected with a first end of the second thermistor, a second end of the second thermistor is connected with a first end of the capacitor, a second end of the capacitor is grounded, a second voltage output end of the drive control unit is connected with a first end of the test resistor, a second end of the test resistor is connected with a first end of the capacitor, and a voltage detection end of the drive control unit is connected with a first end of the capacitor.
Further, the second thermistor is an NTC thermistor.
The embodiment of the second aspect provides an air conditioner, the air conditioner includes the first aspect air conditioner drive plate temperature protection circuit and drive control unit.
The utility model provides an air conditioner drive plate temperature protection circuit and air conditioner, through setting up switching device, first resistance, the second resistance, the third resistance, fourth resistance and first thermistor, when the temperature at the power module at first thermistor place risees, first thermistor's resistance reduces, and then control switching device switches on when first thermistor's voltage reduces to the default, adjust drive control unit output drive signal, avoid the continuation of air conditioner drive plate temperature to rise, it is quick to air conditioner drive plate, reliable temperature protection has been realized, can promote the real-time of air conditioner brushless motor built-in drive plate temperature protection well, moreover, the steam generator is simple in structure, and is low in cost, the commonality is strong.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a circuit diagram of a temperature protection circuit of an air conditioner driving board according to an embodiment of the present invention;
fig. 2 is another circuit diagram of an air conditioner driving board temperature protection circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
An embodiment of the utility model provides an air conditioner drive plate temperature protection circuit, it is connected with drive control unit 10, as shown in fig. 1, air conditioner drive plate temperature protection circuit includes switching device 21, first resistance R1, second resistance R2, third resistance R3, fourth resistance R4 and first thermistor R5;
the one end of first resistance R1 with the signal output part of drive control unit 10 connects in switching device 21's input, switching device 21's output is connected the first end of second resistance R2, the second end ground connection of second resistance R2, switching device 21's control end is connected the first end of third resistance R3, the second end of third resistance R3 with the first end of fourth resistance R4 connects in the first end of first thermistor R5, the second end ground connection of fourth resistance R4, the second end ground connection of first thermistor R5.
When the external temperature is higher than the preset value, the first thermistor R5 controls the switching device 21 to be in the on state, so that the drive control unit 10 stops outputting the drive signal.
The switching device is a PNP triode Q1, the base, the collector and the emitter of the PNP triode Q1 are the control end, the input end and the output end of the switching device, respectively, and the PNP triode Q1 can be in a conducting or a turn-off state according to the change of the base voltage.
The first thermistor R5 is an NTC thermistor, the resistance of the first thermistor R5 decreases with the increase of the temperature of the power module, and the PNP triode Q1 can be turned on and off by the change of the voltage thereon.
The first resistor R1 is a backflow prevention resistor, the second resistor R2 is a short-circuit prevention resistor, the fourth resistor R4 is a voltage dividing resistor, and the driving control unit 10 outputs a driving signal, which may be a speed adjustment voltage signal, through the first resistor R1.
The utility model relates to an air conditioner drive plate temperature protection circuit's working process does: when the PNP triode normally works, the resistance value of the first thermistor R5 is high, the base voltage of the PNP triode Q1 is close to 5V, and the PNP triode Q1 is in a cut-off state; the speed regulation voltage signal output by the driving control unit 10 is directly transmitted to the motor control chip, the air conditioner motor is in a normal working state, if the temperature of the power module is continuously raised, the resistance value of the first thermistor R5 is reduced, the voltage of the first thermistor R5 is reduced, the base voltage of the PNP triode Q1 is reduced until the PNP triode Q1 is conducted, the speed regulation voltage signal output by the driving control unit 10 is reduced, the reduction of the speed regulation signal in the control chip is influenced, the rotating speed of the motor is reduced, the power of the motor is reduced, namely the heating demand of the power module is reduced, and the purpose of temperature protection is achieved.
The embodiment of the utility model provides an air conditioner drive plate temperature protection circuit, through setting up switching device, first resistance R1, second resistance R2, third resistance R3, fourth resistance R4 and first thermistor R5, when the temperature of the power module at first thermistor R5 place risees, first thermistor R5's resistance reduces, and then control switching device switches on when first thermistor's voltage reduces to the default, adjust drive control unit output drive signal, avoid the continuation of air conditioner drive plate temperature to rise, it is quick to air conditioner drive plate, reliable temperature protection has been realized, can promote the real-time nature of the built-in drive plate temperature protection of air conditioner brushless motor well, moreover, the steam generator is simple in structure, and is low in cost, the commonality is strong.
As an embodiment, as shown in fig. 2, the air conditioner driving board temperature protection circuit further includes a second thermistor R6, a capacitor C, and a seventh resistor R7, wherein a first voltage output terminal of the driving control unit 10 is connected to a first terminal of the second thermistor R6, a second terminal of the second thermistor R6 is connected to a first terminal of the capacitor C, a second terminal of the capacitor C is grounded, a second voltage output terminal of the driving control unit 10 is connected to a first terminal of the seventh resistor R7, a second terminal of the seventh resistor R7 is connected to a first terminal of the capacitor C, and a voltage detection terminal of the driving control unit 10 is connected to the first terminal of the capacitor C.
The second thermistor R6 is an NTC thermistor, the resistance of the second thermistor R6 decreases with the increase of the temperature of the power module, there is a corresponding relationship between the resistance of the second thermistor R6 and the temperature, and the current temperature of the power module can be known by obtaining the resistance of the second thermistor R6.
The driving control unit 10 is configured to store a corresponding relationship table between the resistance value of the second thermistor R6 and the temperature, charge the capacitor C through the seventh resistor R7 to obtain a time T1 when the capacitor C is fully charged, charge the capacitor C through the second thermistor R6 to obtain a time T2 when the capacitor C is fully charged, and calculate the resistance of the second thermistor R6 according to the times T1, T2 and the seventh resistor R7, so as to obtain the current temperature.
The working process of the embodiment is as follows: when the drive control unit 10 charges the capacitor C through the seventh resistor R7, and the voltage detection end of the drive control unit 10 detects a high level, it indicates that the capacitor C is fully charged, the drive control unit 10 records the time T1 required for fully charging the capacitor C through the seventh resistor R7, after this process is completed, the first voltage output end of the drive control unit 10 is set to a low level, the capacitor C is discharged, after the discharge is completed, the capacitor C is charged through the second thermistor R6, and when the voltage detection end of the drive control unit 10 detects a high level, the time T2 required for fully charging the capacitor C through the second thermistor R6 is recorded, since (R1/T1) (R2/T2), where R1 is the resistance value of the seventh resistor R7 and R2 is the resistance value of the second thermistor R6, which can be obtained by the above formula: r2 is R1 × T2/T1, so that the current resistance of the second thermistor R6 can be calculated, and the current temperature is obtained according to the corresponding relationship between the resistance of the second thermistor R6 and the temperature.
In the embodiment, the second thermistor R6, the capacitor C and the seventh resistor R7 are connected with the drive control unit 10, the drive control unit charges the capacitor C through the seventh resistor R7 to acquire the time for the capacitor C to be fully charged, discharges the capacitor C, charges the capacitor C through the second thermistor R6 to acquire the resistance of the second thermistor R6, acquires the current temperature of the power module according to the resistance of the second thermistor R6, and the drive control unit 10 performs corresponding control according to the temperature, so that the temperature of the power module is acquired through a simple circuit structure.
The utility model discloses another embodiment provides an air conditioner, and the air conditioner includes air conditioner drive plate temperature protection circuit and drive control unit that above-mentioned embodiment provided.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. For those skilled in the art to which the invention pertains, equivalent substitutions or obvious modifications may be made without departing from the spirit of the invention, and the same properties or uses are deemed to fall within the scope of the invention as defined by the claims as filed.
Claims (6)
1. The air conditioner driving board temperature protection circuit is connected with a driving control unit and is characterized by comprising a switch device, a first resistor, a second resistor, a third resistor, a fourth resistor and a first thermistor;
one end of the first resistor and the signal output end of the driving control unit are connected to the input end of the switch device in a sharing mode, the output end of the switch device is connected to the first end of the second resistor, the second end of the second resistor is grounded, the control end of the switch device is connected to the first end of the third resistor, the second end of the third resistor and the first end of the fourth resistor are connected to the first end of the first thermistor in a sharing mode, the second end of the fourth resistor is connected to the power supply voltage, and the second end of the first thermistor is grounded.
2. The air conditioner driving board temperature protection circuit according to claim 1, wherein the switching device is a PNP transistor, and a base, a collector, and an emitter of the PNP transistor are a control terminal, an input terminal, and an output terminal of the switching device, respectively.
3. An air conditioner driving board temperature protection circuit as claimed in claim 1, wherein said first thermistor is an NTC thermistor.
4. The air conditioner driving board temperature protection circuit according to claim 1, wherein the air conditioner driving board temperature protection circuit further comprises a second thermistor, a capacitor and a seventh resistor, wherein the first voltage output terminal of the driving control unit is connected to the first terminal of the second thermistor, the second terminal of the second thermistor is connected to the first terminal of the capacitor, the second terminal of the capacitor is grounded, the second voltage output terminal of the driving control unit is connected to the first terminal of the seventh resistor, the second terminal of the seventh resistor is connected to the first terminal of the capacitor, and the voltage detection terminal of the driving control unit is connected to the first terminal of the capacitor.
5. An air conditioner driving board temperature protection circuit as claimed in claim 4, wherein said second thermistor is an NTC thermistor.
6. An air conditioner characterized in that it comprises the air conditioner driving board temperature protection circuit and the driving control unit of any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922337531.0U CN211823010U (en) | 2019-12-20 | 2019-12-20 | Air conditioner drive plate temperature protection circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922337531.0U CN211823010U (en) | 2019-12-20 | 2019-12-20 | Air conditioner drive plate temperature protection circuit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211823010U true CN211823010U (en) | 2020-10-30 |
Family
ID=73034088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922337531.0U Active CN211823010U (en) | 2019-12-20 | 2019-12-20 | Air conditioner drive plate temperature protection circuit and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211823010U (en) |
-
2019
- 2019-12-20 CN CN201922337531.0U patent/CN211823010U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7148643B2 (en) | Driving a single-phase motor | |
| US8269467B2 (en) | Dual-mode charger circuit | |
| CN100446402C (en) | Circuit for starting DC fan | |
| CN102594234B (en) | Speed regulation driving integrated circuit for single-phase brushless direct current fan | |
| CN202510400U (en) | Speed regulating type single-phase brushless DC fan drive integrated circuit | |
| CN108725205A (en) | The electric vehicle charging control circuit of relay modified overheating protection | |
| CN100438264C (en) | A charging circuit and a semiconductor device including the same | |
| CN202840493U (en) | Motor, controller thereof and overheating protection circuit of power drive module thereof | |
| US8421390B2 (en) | Fan motor control device | |
| CN202261136U (en) | Motor and overcurrent detection circuit thereof | |
| CN210769463U (en) | Power supply control circuit of fan | |
| US7495402B2 (en) | Fan motor controller | |
| US9013169B2 (en) | Soft-start time control circuit | |
| CN211823010U (en) | Air conditioner drive plate temperature protection circuit and air conditioner | |
| CN111313357B (en) | Intelligent power module and detection circuit thereof, and air conditioner | |
| WO2005066732A1 (en) | Apparatus and method for controlling temperature | |
| CN212028135U (en) | Fill electric pile fan speed governing control circuit | |
| CN210380231U (en) | Locked-rotor protection and locked-rotor restarting circuit device | |
| CN112271703A (en) | Short-circuit protection circuit and electrical equipment | |
| CN107340719B (en) | Starting self-locking device and intelligent home control system | |
| JP2007193458A (en) | Power supply circuit | |
| CN114024288B (en) | Driver power-on pre-charging circuit, device and driver | |
| CN213521282U (en) | Short-circuit protection circuit and electrical equipment | |
| CN219535921U (en) | Motor control circuit and motor system | |
| JP3396627B2 (en) | Low voltage detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |