Ultra-low temperature refrigerator strong and weak current integrated frequency conversion controller

Abstract

The invention discloses an ultra-low temperature refrigerator strong and weak current integrated frequency conversion controller which mainly comprises a power supply module, a temperature acquisition module, an MCU control chip, a display module, a power driving module and a motor. The controller provides stable power supply through the power supply module, and monitors the temperature in the box in real time through the temperature acquisition module. And the MCU control chip converts the temperature signal into a control signal through ADC (Analog to Digital Converter), and drives the power driving module to adjust the rotating speed of the motor, so that the dynamic adjustment of the refrigerating capacity is realized. And the display module communicates with the MCU and displays the temperature in the box in real time. Strong and weak current integration is combined with the frequency conversion control technology, the system cost is effectively reduced, meanwhile, accurate control and adjustment of the temperature in the refrigerator are ensured, and the working efficiency and reliability of the ultralow-temperature refrigerator are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical refrigeration, and in particular relates to a high- and low-voltage integrated frequency conversion controller for an ultra-low temperature refrigerator. Background Art

[0002] At present, household appliances such as refrigerators generally use fixed-frequency compressors for temperature regulation. The disadvantage is that the speed is fixed due to the industrial frequency power supply, and the output power cannot be adjusted according to the load demand. In contrast, variable-frequency compressors can flexibly adjust the motor speed according to the actual load. When the frequency increases, the speed increases, and the cooling rate increases accordingly, thereby increasing the cooling capacity and avoiding energy waste. Due to its significant advantages, variable-frequency compressors have gradually become the main development trend of compressors, and more and more users are choosing them to replace traditional fixed-frequency compressors.

[0003] However, variable frequency compressors are usually equipped with independent drive boards for control, and the drive signals are input by the main control board. The design of the main control board and the drive board working separately makes the control process cumbersome and costly. Therefore, there is an urgent need for a control scheme that can effectively combine strong electricity and weak electricity. To this end, the present invention proposes a strong and weak electricity integrated variable frequency controller for ultra-low temperature refrigerators. The controller integrates the main control function and the drive function into one system, realizes the coordinated work of strong electricity and weak electricity, simplifies the control process, reduces system costs, and improves the operating efficiency of the refrigerator. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an ultra-low temperature refrigerator with integrated strong and weak current frequency conversion controller, which can solve the problems existing in the existing design and accurately adjust and control the refrigerator temperature while ensuring low power consumption, low noise and low cost.

[0005] The ultra-low temperature refrigerator integrated frequency conversion controller of the present invention can be used to drive the motor, including a power module, a temperature acquisition module, an MCU control chip, a display module, and a power drive module;

[0006] The first output end of the power module is connected to the first input end of the MCU control chip, the second output end of the power module is connected to the first input end of the power driving module, the third output end of the power module is connected to the second input end of the power driving module, the fourth output end of the power module is connected to the input end of the temperature acquisition module, the output end of the temperature acquisition module is connected to the second input end of the MCU control chip, the first output end of the MCU control chip is connected to the third input end of the power driving module, the second output end of the MCU control chip is connected to the input end of the display module, the first output end of the power driving module is connected to the third input end of the MCU control chip, and the second output end of the power driving module is connected to the motor.

[0007] The power supply module includes a filter module, a rectifier module and a transformer module. The input end of the filter module is connected to the AC end AC, the output end of the filter module is connected to the input end of the rectifier module, the output end (+Udc) of the rectifier module is respectively connected to the input end of the transformer module and the first input end of the power drive module, the first output end of the transformer module is connected to the first input end of the MCU control chip, the second output end of the transformer module is connected to the second input end of the power drive module, and the third output end of the transformer module is connected to the input end of the temperature acquisition module.

[0008] The power driving module includes a driving module, an inverter module, and a current sampling module. The third input end of the driving module is connected to the first output end of the MCU control chip, the first output end of the driving module is connected to the second input end of the inverter module, the first output end of the inverter module is connected to the motor, the second output end of the inverter module is connected to the input end of the current sampling module, and the output end of the current sampling module is connected to the third input end of the MCU control chip.

[0009] The invention provides an ultra-low temperature refrigerator with integrated strong and weak current frequency conversion controller, comprising the following steps:

[0010] The AC end AC obtains high-voltage direct current after passing through the filter module and the rectifier module in the power module. The high-voltage direct current is respectively sent to the inverter module in the power drive module and the transformer module in the power module. The transformer module generates different low-voltage direct currents after voltage reduction to power the temperature acquisition module, the MCU control chip, and the power drive module.

[0011] The temperature acquisition module acquires the temperature of the ultra-low temperature refrigerator, controls it through ADC conversion inside the MCU control chip, displays the temperature through the display module, and the MCU control chip generates a control signal to the power drive module for control.

[0012] After the power driving module receives the control signal from the MCU control chip, it generates three-phase complementary PWM waves (PWM1H, PWM1L, PWM2H, PWM2L, PWM3H, PWM3L) through the driving module, and then drives the motor after power amplification through the inverter module.

[0013] The present invention has the following beneficial effects:

[0014] The ultra-low temperature refrigerator integrated strong and weak current frequency conversion controller described in the present invention integrates the main control function and the driving function into one system, realizes the coordinated work of strong and weak current, simplifies the control process, reduces the system cost, and improves the operation efficiency of the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a device diagram of the present invention.

[0016] Figure 2 It is a logic flow chart of the present invention.

[0017] Figure 3 It is a system control block diagram of the present invention.

[0018] Among them, 001-ultra-low temperature refrigerator, 002-fan, 004-U phase of the motor, 005-V phase of the motor, 006-W phase of the motor, 007-integrated frequency conversion controller of strong and weak electricity, 008-temperature sensor, 100-power module, 101-temperature acquisition module, 102-MCU control chip, 103-display module, 104-power drive module, 105-motor. DETAILED DESCRIPTION

[0019] The present invention is described clearly and completely below in conjunction with the accompanying drawings so that those skilled in the art can fully implement the present invention without having to make creative efforts.

[0020] The specific implementation method of the present invention is: Figure 1-3 As shown, a frequency conversion controller for an ultra-low temperature refrigerator with integrated power and weak current includes a power module (100), a temperature acquisition module (101), an MCU control chip (102), a display module (103), and a power drive module (104);

[0021] The first output end of the power module (100) is connected to the first input end of the MCU control chip (102), the second output end of the power module (100) is connected to the first input end of the power drive module (104), the third output end of the power module (100) is connected to the second input end of the power drive module (104), the fourth output end of the power module (100) is connected to the input end of the temperature acquisition module (101), the output end of the temperature acquisition module (101) is connected to the second input end of the MCU control chip (102), the first output end of the MCU control chip (102) is connected to the third input end of the power drive module (104), the second output end of the MCU control chip (102) is connected to the input end of the display module (103), the first output end of the power drive module (104) is connected to the third input end of the MCU control chip (102), and the second output end of the power drive module (104) is connected to the motor (105).

[0022] The power module (100) comprises a filter module, a rectifier module and a transformer module; the input end of the filter module is connected to an AC end AC; the output end of the filter module is connected to an input end of the rectifier module; the output end (+Udc) of the rectifier module is respectively connected to an input end of the transformer module and a first input end of a power drive module (104); the first output end of the transformer module is connected to a first input end of an MCU control chip (102); the second output end of the transformer module is connected to a second input end of the power drive module (104); and the third output end of the transformer module is connected to an input end (101) of a temperature acquisition module.

[0023] The power driving module (104) comprises a driving module, an inverter module, and a current sampling module; the third input end of the driving module is connected to the first output end of the MCU control chip (102); the first output end of the driving module is connected to the second input end of the inverter module; the first output end of the inverter module is connected to the motor (105); the second output end of the inverter module is connected to the input end of the current sampling module; and the output end of the current sampling module is connected to the third input end of the MCU control chip (102).

[0024] The invention provides an ultra-low temperature refrigerator with a strong and weak current integrated frequency conversion controller, comprising the following steps:

[0025] The AC end AC obtains high-voltage direct current (+Udc) after passing through a filter module and a rectifier module in the power module (100). The high-voltage direct current (+Udc) is respectively fed into an inverter module in the power drive module (104) and a transformer module in the power module (100). The transformer module generates different low-voltage direct currents after voltage reduction to supply power to the temperature acquisition module (101), the MCU control chip (102), and the power drive module (104).

[0026] The temperature acquisition module (101) acquires the temperature of the ultra-low temperature refrigerator (001), controls the temperature through ADC conversion inside the MCU control chip (102), displays the temperature through the display module (103), and the MCU control chip (102) generates a control signal to the power drive module (104) for control.

[0027] After receiving the control signal input by the MCU control chip (102), the power driving module (104) generates three-phase complementary PWM waves (PWM1H, PWM1L, PWM2H, PWM2L, PWM3H, PWM3L) through the driving module, and then amplifies the power through the inverter module to drive the motor (105).

[0028] In summary, the above-mentioned ultra-low temperature refrigerator integrated frequency conversion controller effectively integrates strong and weak electricity. The MCU control chip of the controller converts the temperature signal through the internal ADC to generate a control signal, driving the power drive module to adjust the motor speed. The display module communicates with the MCU to display the temperature inside the box in real time. This design not only effectively reduces the system cost, but also ensures the precise control and adjustment of the temperature inside the box, improving the working efficiency and reliability of the ultra-low temperature refrigerator.

[0029] The above-mentioned embodiments only express the implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which are all within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A frequency conversion controller for ultra-low temperature refrigerators with integrated power and weak current, which can be used to drive a motor, characterized in that: It comprises a power module (100), a temperature acquisition module (101), an MCU control chip (102), a display module (103), and a power drive module (104); The first output end of the power module (100) is connected to the first input end of the MCU control chip (102), the second output end of the power module (100) is connected to the first input end of the power drive module (104), the third output end of the power module (100) is connected to the second input end of the power drive module (104), the fourth output end of the power module (100) is connected to the input end of the temperature acquisition module (101), the output end of the temperature acquisition module (101) is connected to the second input end of the MCU control chip (102), the first output end of the MCU control chip (102) is connected to the third input end of the power drive module (104), the second output end of the MCU control chip (102) is connected to the input end of the display module (103), the first output end of the power drive module (104) is connected to the third input end of the MCU control chip (102), and the second output end of the power drive module (104) is connected to the motor (105).

2. According to claim 1, a frequency conversion controller for ultra-low temperature refrigerators with integrated power and weak current is characterized in that: The power module (100) comprises a filter module, a rectifier module and a transformer module; the input end of the filter module is connected to an AC end AC; the output end of the filter module is connected to an input end of the rectifier module; the output end (+Udc) of the rectifier module is respectively connected to an input end of the transformer module and a first input end of a power drive module (104); the first output end of the transformer module is connected to a first input end of an MCU control chip (102); the second output end of the transformer module is connected to a second input end of the power drive module (104); and the third output end of the transformer module is connected to an input end (101) of a temperature acquisition module.

3. The ultra-low temperature refrigerator integrated frequency conversion controller according to claim 1, characterized in that: The power driving module (104) comprises a driving module, an inverter module, and a current sampling module; the third input end of the driving module is connected to the first output end of the MCU control chip (102); the first output end of the driving module is connected to the second input end of the inverter module; the first output end of the inverter module is connected to the motor (105); the second output end of the inverter module is connected to the input end of the current sampling module; and the output end of the current sampling module is connected to the third input end of the MCU control chip (102).

4. The ultra-low temperature refrigerator integrated frequency conversion controller according to claim 2 comprises the following steps: The AC end AC obtains high-voltage direct current (+Udc) after passing through a filter module and a rectifier module in the power module (100). The high-voltage direct current (+Udc) is respectively fed into an inverter module in the power drive module (104) and a transformer module in the power module (100). The transformer module generates different low-voltage direct currents after voltage reduction to supply power to the temperature acquisition module (101), the MCU control chip (102), and the power drive module (104). The temperature acquisition module (101) acquires the temperature of the ultra-low temperature refrigerator (001), controls the temperature through ADC conversion inside the MCU control chip (102), displays the temperature through the display module (103), and the MCU control chip (102) generates a control signal to the power drive module (104) for control.

5. The ultra-low temperature refrigerator integrated frequency conversion controller according to claim 3 comprises the following steps: After receiving the control signal input by the MCU control chip (102), the power driving module (104) generates three-phase complementary PWM waves (PWM1H, PWM1L, PWM2H, PWM2L, PWM3H, PWM3L) through the driving module, and then amplifies the power through the inverter module to drive the motor (105).

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