CN215734071U - Drive control circuit for frequency conversion fan of refrigerator - Google Patents
Drive control circuit for frequency conversion fan of refrigerator Download PDFInfo
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- CN215734071U CN215734071U CN202122325542.4U CN202122325542U CN215734071U CN 215734071 U CN215734071 U CN 215734071U CN 202122325542 U CN202122325542 U CN 202122325542U CN 215734071 U CN215734071 U CN 215734071U
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Abstract
The utility model relates to a motor control technology and discloses a drive control circuit of a variable frequency fan of a refrigerator, which improves the rotating speed precision of a motor, reduces the cost and improves the product efficiency. The drive control circuit comprises a singlechip, a triode, a first resistor and a second resistor; the base electrode of the triode is connected with the PWM signal output end of the singlechip through a first resistor; the collector of the triode is connected with the PWM control signal input end of the fan and is connected with a 5V power supply through the second resistor; and the emitter of the triode is grounded.
Description
Technical Field
The utility model relates to a motor control technology, in particular to a drive control circuit of a refrigerator variable frequency fan.
Background
The frequency conversion refrigerator has the advantages of frequency conversion, energy conservation and accurate temperature control, and is popular with users. The temperature regulation of each chamber of the refrigerator is realized by regulating each functional module such as an air door, a fan and the like, and the temperature can be accurately regulated by regulating the rotating speed of a fan motor.
The existing fan driving control circuit adopts a mode of changing voltage to adjust the rotating speed of a motor, namely a duty ratio speed adjusting mode, and the motor speed adjustment is realized by adjusting the voltage duty ratio (generally 20-100%) of the motor. As shown in fig. 1, a FAN signal end is connected to a master control single chip microcomputer, and the single chip microcomputer can output square waves with duty ratio of 20% -100%; the V414 is a switching triode, and the switch of the triode is controlled by high and low signals, so that the singlechip can be protected from failure caused by subsequent high-voltage impact; v415 is a power triode which controls the on-off of a power supply 12V entering a fan motor, and the power supply voltage received by the fan ranges from 2.4V to 12V through the front-end duty ratio control; l401 and C418 are used for energy storage freewheeling, because of different duty ratios, the voltage from the front-end transistor V415 is a discontinuous voltage, and freewheeling needs to be performed through the inductor and the capacitor therein, so that the voltage entering the fan motor is a continuous dc voltage; the VD431 is a reverse absorption diode, a voltage peak of about 50V or higher can be generated when the motor starts to run, the diode is used for absorbing the voltage peak and protecting the triode V415 from being broken down, and therefore, the power voltage received by the fan motor is an unstable voltage of 2.4V-12V. FB (feedback) is that the running frequency of the motor is fed back to the main control singlechip, and the control singlechip regulates the voltage duty ratio of the motor on the basis of the running frequency so as to achieve the aim of controlling the rotating speed of the motor.
Because the power supply voltage of a refrigerator motor on the market is about 12V generally, the maximum rotating speed of a fan is about 2000 to 3000 revolutions under the condition of full voltage, the rotating speed precision is about 250rpm, the rotating speed precision is low and the refrigerator temperature control precision is low through the duty ratio speed regulation mode; in addition, because the rotating speed is controlled by controlling the voltage, an MOS tube or a power triode is required to be added on the circuit to control the on-off of the voltage, and inductance energy storage follow current is required at the same time, so that the circuit is complex, the circuit device is high in cost, and the power device generates heat, so that the product efficiency is low.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the drive control circuit of the refrigerator variable frequency fan is provided, the rotating speed precision of a motor is improved, meanwhile, the cost is reduced, and the product efficiency is improved.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
a drive control circuit of a variable frequency fan of a refrigerator is applied to speed regulation control of a motor of the fan, and a power line of the fan is directly connected with a 12V DC power supply; the drive control circuit comprises a singlechip, a triode, a first resistor and a second resistor; the base electrode of the triode is connected with the PWM signal output end of the singlechip through a first resistor; the collector of the triode is connected with the PWM control signal input end of the fan and is connected with a 5V power supply through the second resistor; and the emitter of the triode is grounded.
As a further optimization, the triode adopts an NPN tube.
The utility model has the beneficial effects that:
based on the design of above-mentioned drive control circuit, can not change the size of fan voltage, directly control the fan rotational speed through the PWM ripples, this scheme can let the motor work under a steady voltage, reduce the loss of voltage, the PWM ripples is adjusted speed simultaneously and can be let the operation rotational speed precision of motor higher, the speed unit that can adjust is littleer, make the cavity temperature control of refrigerator more accurate, realize the accurate accuse temperature purpose of refrigerator, above-mentioned circuit has reduced the power device and has used simultaneously, also reduced the device and generated heat when reducing product cost, improve the efficiency of product, let the product have more competitiveness.
Drawings
Fig. 1 is a structure diagram of a conventional fan driving control circuit;
fig. 2 is a structural diagram of a fan driving control circuit according to an embodiment of the present invention.
Detailed Description
The utility model aims to provide a drive control circuit of a variable frequency fan of a refrigerator, which improves the rotating speed precision of a motor, reduces the cost and improves the product efficiency. The scheme uses the mode of PWM wave speed regulation and control of the rotating speed of the motor to replace the original mode of duty ratio speed regulation and control, thereby improving the accuracy of the temperature control of the chamber of the refrigerator, reducing the use of power devices by simplifying the circuit, and reducing the device cost and the production and manufacturing cost of products.
Example (b):
as shown in fig. 2, the driving control circuit for the variable frequency fan of the refrigerator provided by the embodiment is applied to speed regulation control of a motor of the fan, and a power line of the fan is directly connected with a 12V DC power supply; the driving control circuit consists of a singlechip (not shown in the figure), a triode V406, a first resistor R435 and a second resistor R448; the base electrode of the triode V406 is connected with the PWM signal output end of the singlechip through a first resistor R435; the collector of the triode V406 is connected with the PWM control signal input end of the fan and is connected with a 5V power supply through the second resistor R448; the emitter of the transistor V406 is grounded.
The PWM signal sends a square wave with frequency ranging from 20KHz to 30KHz from the control panel singlechip, the first resistor R435 is a current-limiting resistor, the triode V406 is a switching triode for improving the signal switching-on and switching-off capability, and the second resistor R448 is a pull-up resistor. Based on the circuit design, the rotating speed of the motor is adjusted by adjusting the switching frequency of the PWM wave, and the aim of accurately controlling the temperature of the refrigerator is fulfilled.
Because the fan motor has a certain power (about 3W-4W), in the prior art, a common triode cannot be adopted by a mode of controlling the on-off of a power supply through a duty ratio, a power triode (V415 in fig. 1) is needed, and meanwhile, in order to protect a singlechip from being burnt by high voltage 12V, a switching triode (V414 in fig. 1) is also needed at the front end, for duty ratio control, a square wave is output by a pin 3 of the power triode V415, and a stable DC power supply which is not needed by the motor is needed, so that an inductor L401 and a capacitor C418 in fig. 1 are needed to carry out energy storage follow current, and the square wave is converted into a stable DC power supply, and the above devices are essential in the scheme.
Compared with the duty ratio control rotating speed scheme in the prior art, the embodiment replaces the motor rotating speed control with PWM signal control by power on-off control, the 12VDC power supply on the control board is directly connected with the motor, a power triode, a follow current inductor, a capacitor, a protection diode and a triode are omitted, the PWM signal is only a weak current control signal, and the power is basically not large, so that the requirement can be met by adopting a common triode (V406 in figure 2), and it can be seen that the circuit in the scheme of the embodiment is greatly simplified, the cost of a product is reduced, a power device is omitted, and the product efficiency is improved; through PWM wave control, the rotational speed precision of the motor is high, and the rotational speed precision is controlled within 10 rpm-30 rpm, and for summary, the drive control circuit of the refrigerator variable frequency fan provided by the embodiment improves the product performance and the market competitiveness.
Although embodiments of the present invention have been described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the appended claims.
Claims (2)
1. A drive control circuit of a variable frequency fan of a refrigerator is applied to the speed regulation control of a motor of the fan and is characterized in that,
a power line of the fan is directly connected with a 12V DC power supply; the drive control circuit comprises a singlechip, a triode, a first resistor and a second resistor; the base electrode of the triode is connected with the PWM signal output end of the singlechip through a first resistor; the collector of the triode is connected with the PWM control signal input end of the fan and is connected with a 5V power supply through the second resistor; and the emitter of the triode is grounded.
2. The drive control circuit of the inverter fan of the refrigerator as claimed in claim 1,
the triode adopts an NPN tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122325542.4U CN215734071U (en) | 2021-09-24 | 2021-09-24 | Drive control circuit for frequency conversion fan of refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122325542.4U CN215734071U (en) | 2021-09-24 | 2021-09-24 | Drive control circuit for frequency conversion fan of refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215734071U true CN215734071U (en) | 2022-02-01 |
Family
ID=80024497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122325542.4U Active CN215734071U (en) | 2021-09-24 | 2021-09-24 | Drive control circuit for frequency conversion fan of refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215734071U (en) |
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2021
- 2021-09-24 CN CN202122325542.4U patent/CN215734071U/en active Active
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