Intelligent time-delay starting machine-controlled frequency conversion board
By adding a touch switch SW1 to the MCU controller module of the variable frequency refrigerator and refrigerator, the start time is judged by the discharge time of the capacitor C1, the problem of forced start of the compressor in the unbalanced state is solved, and faster production testing is achieved and cost reduction is reduced.
Patent Information
- Application Number
- CN202510234197.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2025-04-25
AI Technical Summary
When the inverter refrigerator and refrigerator are powered on again after power is powered off, the suction and exhaust pressure of the box system is not balanced, resulting in forced start of the compressor, causing abnormal noise problems. At the same time, due to delayed start-up requirements in the production test stage, the production cycle is long and the cost increases.
A machine-controlled frequency converter board with intelligent delay start is designed. By adding touch switch SW1 to both ends of capacitor C1 of the MCU controller module, the start time of the frequency converter is judged by the discharge time of the capacitor to avoid forced start of the compressor in an unbalanced state.
It effectively solves the problem of abnormal noise from the compressor when the frequency converter refrigerator and refrigerator are turned on after power off, shortens production testing time, and reduces production cycle and costs.
Smart Images
Figure CN119879506A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of refrigerators, and in particular to a machine-controlled frequency conversion board with intelligent delayed start. Background Art
[0002] In recent years, with the upgrading of energy efficiency standards in the refrigerator industry, the conversion of fixed-frequency refrigerators to high-frequency refrigerators is the mainstream direction of the industry. However, there are always some sudden abnormal problems in the conversion process. For example, the refrigerator suddenly loses power for 1-3 minutes during operation. The entire frequency conversion board including the MCU has no power. When the power is restored, the pressure difference of the refrigerator system is relatively large, and the compressor will make abnormal noise when starting, which will bring great noise impact to customers.
[0003] At present, the common practice of household refrigerators is to power on the refrigerator again after power failure. The refrigerator main control board gives a delay signal and waits for the refrigerator load to be balanced before sending a start signal to the frequency converter to drive the compressor to operate, so as to avoid the compressor being forced to start under unbalanced pressure and causing abnormal start-up noise. However, some refrigerator products do not have a main control board, but only a mechanical thermostat, such as Figure 3 As shown, when the power of the refrigerator body is cut off, the entire inverter board including the MCU chip has no power. When the power is restored again, the MCU chip is reset and the compressor is started directly. At this time, the pressure of the refrigerator system is high, causing the compressor to hit the shell when it starts.
[0004] Some refrigerators require that the inverter board itself be set to start after a delay of 5 minutes through the MCU software each time the cabinet is powered on, waiting for the system to be balanced before starting the compressor. This approach can also avoid abnormal noise when the compressor starts in an unbalanced state. However, the testing phase of this inverter board with software delay is more painful during the production process. Each power-on test requires a 5-minute wait, which slows down the production cycle and increases the production cost, making it impossible to meet the market's requirements for rapid delivery. This is often the case for refrigerator manufacturers.
[0005] In view of the above problems, how to solve the problem that the inverter board of the inverter refrigerator takes a long time to start up after power failure has become a technical problem that people urgently need to solve. Summary of the invention
[0006] In view of the above technical problems in the related art, the present invention proposes a machine-controlled frequency conversion board with intelligent delayed start, which can overcome the above shortcomings of the prior art.
[0007] To achieve the above technical objectives, the technical solution of the present invention is implemented as follows: A machine-controlled frequency conversion board with intelligent delayed start, comprising an MCU controller module, the MCU controller module is connected to a detection module, the detection module is respectively connected to an inverter module and a rectifier filter module, the rectifier filter module is respectively connected to an inverter module and an EMC module, and the EMC module is connected to a signal acquisition module; The MCU controller module includes an MCU chip, and pin 5 of the MCU chip is respectively connected to one end of a resistor R3, one end of a switch SW1, and a positive electrode of a capacitor C1 through a resistor R4, the other end of the resistor R3 is connected to a negative electrode of a diode D1, the positive electrode of the diode D1 is connected to a DC power supply DC5V, and the other end of the switch SW1 and the negative electrode of the capacitor C1 are both connected to the ground; pin 47 of the MCU chip is connected to a signal acquisition module R6, and pin 39 of the MCU chip is connected to a DC power supply DC5V.
[0008] Furthermore, pins 36, 35, 34, 33, 32, 32 and 31 of the MCU chip are sequentially connected to the corresponding inverter module IGBT.
[0009] Furthermore, the detection module includes a resistor R1 and a resistor R2, pin 1 of the MCU chip is connected to one end of the resistor R1, and the other end of the resistor R1 is respectively connected to the rectifier and filter module, the bus BUS and the inverter module, pin 20 of the MCU chip is connected to one end of the resistor R2, and the other end of the resistor R2 is respectively connected to one end of the resistor Rs and the inverter module, and the other end of the resistor Rs is connected to the rectifier and filter module.
[0010] Furthermore, the inverter module is connected to a compressor. Furthermore, the rectification and filtering module is also connected to the ground.
[0011] Furthermore, the EMC module is respectively connected to the PE grounding wire, the AC mains connection, one end of the box temperature controller, and the cathode of the diode D2; the anode of the diode D2 is connected to one end of the resistor R7; the other end of the resistor R7 and the other end of the box temperature controller are both connected to the signal acquisition module.
[0012] Beneficial effects of the present invention: The present invention adds a touch switch SW1 at both ends of the capacitor C1 of the MCU controller module, and judges the voltage of the C1 capacitor to solve the problem of abnormal compressor noise caused by forced starting of the compressor due to unbalanced suction and exhaust pressure of the cabinet system when the variable frequency refrigerator or freezer is powered on again after power failure, thereby solving the bottleneck problem in production testing, shortening the product production cycle, and comprehensively reducing the purchase cost of the variable frequency board. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0014] Figure 1 1 is a schematic diagram of the circuit structure of a machine-controlled frequency conversion board with delayed start according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the circuit structure of the MCU controller module of the machine-controlled frequency conversion board with delayed start according to an embodiment of the present invention; Figure 3 It is a structural schematic diagram of the existing delayed start according to an embodiment of the present invention. DETAILED DESCRIPTION
[0015] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.
[0016] like Figure 1-2 As shown, according to an embodiment of the present invention, a machine-controlled frequency conversion board with intelligent delayed start includes an MCU controller module, the MCU controller module is connected to a detection module, the detection module is respectively connected to an inverter module and a rectifier filter module, the rectifier filter module is respectively connected to an inverter module and an EMC module, and the EMC module is connected to a signal acquisition module; The MCU controller module includes an MCU chip, and pin 5 of the MCU chip is respectively connected to one end of a resistor R3, one end of a switch SW1, and a positive electrode of a capacitor C1 through a resistor R4, the other end of the resistor R3 is connected to a negative electrode of a diode D1, the positive electrode of the diode D1 is connected to a DC power supply DC5V, and the other end of the switch SW1 and the negative electrode of the capacitor C1 are both connected to the ground; pin 47 of the MCU chip is connected to a signal acquisition module R6, and pin 39 of the MCU chip is connected to a DC power supply DC5V.
[0017] In the embodiment, pins 36, 35, 34, 33, 32, 32 and 31 of the MCU chip are sequentially connected to the corresponding inverter module IGBT.
[0018] In the embodiment, the detection module includes a resistor R1 and a resistor R2, pin 1 of the MCU chip is connected to one end of the resistor R1, and the other end of the resistor R1 is respectively connected to the rectifier and filter module, the bus BUS and the inverter module, pin 20 of the MCU chip is connected to one end of the resistor R2, and the other end of the resistor R2 is respectively connected to one end of the resistor Rs and the inverter module, and the other end of the resistor Rs is connected to the rectifier and filter module.
[0019] In the embodiment, the inverter module is connected to a compressor. In the embodiment, the rectification and filtering module is also connected to the ground.
[0020] In the embodiment, the EMC module is respectively connected to the PE grounding wire, the AC mains, one end of the box temperature controller, and the cathode of the diode D2. The anode of the diode D2 is connected to one end of the resistor R7. The other end of the resistor R7 and the other end of the box temperature controller are both connected to the signal acquisition module.
[0021] In order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are described in detail below through specific usage methods.
[0022] In specific use, according to the intelligent delayed start machine control frequency conversion board described in the present invention, Figure 1-2 As shown, it includes EMC module, rectifier filter module, inverter module, signal sampling module, detection module and MCU controller module. Figure 2 As shown, a capacitor charging and discharging circuit is added to the MCU controller module of the frequency converter board. The discharge time of the capacitor is used to judge the voltage value of the MCU's 5th pin to confirm whether the frequency converter board is started normally or continues to be delayed. The capacitor charging circuit is composed of a diode D1, a resistor R3, a capacitor C1 and a resistor R4.
[0023] Working principle: When the inverter board is powered on, diode D1 and resistor R3 charge capacitor C1. Resistor R3 is 10KΩ, so capacitor C1 can be fully charged quickly. When the power is off, capacitor C1 discharges to MCU pin 5 through resistor R4. Resistor R4 is 1MΩ. In addition, the MCU pin is in high resistance state, so the discharge time of capacitor C1 is longer. It is precisely by using this discharge time to confirm whether it is a temporary power outage, that is, the voltage maintenance time depends on the capacitance value of capacitor C1. In this project, capacitor C1 is 100uf, and the voltage drops to 0.8V in about 3.5 minutes. If you want to maintain it for a longer time, increase the capacitance value.
[0024] Specific implementation process: When powered on for the first time, capacitor C1 is definitely out of power, the voltage of MCU's 5th pin is less than 0.8V, and the inverter board immediately starts the compressor to run normally. When there is a sudden power outage and the power comes back after a while, the inverter board runs, and the MCU reads the voltage value of the 5th pin as soon as possible. When the voltage of MCU's 5th pin is greater than 0.8V, the MCU determines that the box has just lost power and the power of capacitor C1 has not been fully discharged. The MCU software continues to delay for 4 minutes to start the compressor (the continued delay is to wait for the box system pressure to balance); when the voltage of MCU's 5th pin is less than 0.8V, the MCU determines that the box has been powered off for too long and the capacitor C1 has been fully discharged. At this time, the compressor is started normally. Among them, 0.8V is the threshold set by the software, and the value read by the voltage of MCU's 5th pin is compared with it, and then the MCU makes a judgment.
[0025] To solve the bottleneck problem of frequency conversion board production test, the present invention adds a touch switch SW1 at both ends of capacitor C1. In the actual production test link of the frequency conversion board, the SW1 switch is pressed before power is turned on to discharge the capacitor C1 so that the frequency conversion board can run immediately after power is turned on.
[0026] In summary, with the help of the above technical solution of the present invention, by adding a touch switch SW1 at both ends of the capacitor C1 of the MCU controller module and judging the voltage of the C1 capacitor, the problem of abnormal noise caused by forced starting of the compressor due to unbalanced suction and exhaust pressure of the cabinet system when the variable frequency refrigerator and freezer are powered on again after power failure can be solved, the bottleneck problem in production testing can be solved, the product production cycle can be shortened, and the procurement cost of the frequency conversion board can be comprehensively reduced.
[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A machine-controlled frequency conversion board with intelligent delayed start, characterized in that: It includes an MCU controller module, the MCU controller module is connected to the detection module, the detection module is respectively connected to the inverter module and the rectifier filter module, the rectifier filter module is respectively connected to the inverter module and the EMC module, and the EMC module is connected to the signal acquisition module; The MCU controller module includes an MCU chip, and pin 5 of the MCU chip is respectively connected to one end of a resistor R3, one end of a switch SW1, and a positive electrode of a capacitor C1 through a resistor R4, the other end of the resistor R3 is connected to a negative electrode of a diode D1, the positive electrode of the diode D1 is connected to a DC power supply DC5V, and the other end of the switch SW1 and the negative electrode of the capacitor C1 are both connected to the ground; pin 47 of the MCU chip is connected to a signal acquisition module R6, and pin 39 of the MCU chip is connected to a DC power supply DC5V.
2. The machine-controlled frequency conversion board with delayed start according to claim 1 is characterized in that: Pins 36, 35, 34, 33, 32, 32 and 31 of the MCU chip are sequentially connected to the corresponding inverter module IGBT.
3. The machine-controlled frequency conversion board with delayed start according to claim 1 is characterized in that: The detection module includes a resistor R1 and a resistor R2, pin 1 of the MCU chip is connected to one end of the resistor R1, and the other end of the resistor R1 is respectively connected to the rectifier and filter module, the bus BUS and the inverter module, pin 20 of the MCU chip is connected to one end of the resistor R2, and the other end of the resistor R2 is respectively connected to one end of the resistor Rs and the inverter module, and the other end of the resistor Rs is connected to the rectifier and filter module.
4. The machine-controlled frequency conversion board with delayed start according to claim 1, characterized in that: The inverter module is connected to a compressor.
5. The machine-controlled frequency conversion board with delayed start according to claim 1, characterized in that: The rectification and filtering module is also connected to the ground.
6. The machine-controlled frequency conversion board with delayed start according to claim 1, characterized in that: The EMC module is respectively connected to the PE grounding wire, the AC connection of the mains, one end of the box temperature controller, and the cathode of the diode D2. The anode of the diode D2 is connected to one end of the resistor R7. The other end of the resistor R7 and the other end of the box temperature controller are both connected to the signal acquisition module.