Intelligent time-delay starting machine-controlled frequency conversion board

Abstract

The utility model discloses an intelligent delay start machine control frequency conversion board, comprising an MCU controller module, the MCU controller module is connected with a detection module, the detection module is respectively connected with an inversion module and a rectification filtering module, the rectification filtering module is respectively connected with the inversion module and an EMC module, and the EMC module is connected with a signal acquisition module. The touch switch SW1 is additionally arranged at two ends of the capacitor C1 of the MCU controller module, the problem of abnormal sound of a compressor caused by forced starting of the compressor due to unbalanced suction and exhaust pressure of a box body system after the inverter refrigerator and the freezer are powered off and then powered on is solved by judging the voltage of the capacitor C1, the bottleneck problem in production test is solved, the production cycle of products is shortened, and the production efficiency is improved. The purchase cost of the frequency conversion board can be comprehensively reduced.

Description

Technical Field

[0001] This utility model relates to the field of refrigerator technology, specifically to a machine-controlled frequency converter board with intelligent delayed start. Background Technology

[0002] In recent years, with the upgrading of energy efficiency standards in the refrigerator industry, the conversion of fixed-frequency refrigerators to frequency converters is the current mainstream direction of the industry. However, there are always some sudden abnormal problems during the conversion process. For example, if the refrigerator suddenly loses power for 1-3 minutes during operation, the entire frequency converter board, including the MCU, will lose 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 cause great noise impact on customers.

[0003] Currently, the common practice for household refrigerators is that after a power outage and subsequent power restoration, the main control board sends a delay signal, waiting for the refrigerator's load to balance before sending a start signal to the inverter board to drive the compressor. This avoids forcing the compressor to start under unbalanced pressure, which could cause abnormal starting noises. However, some freezer products do not have a main control board; they only have a mechanical thermostat, such as... Figure 3 As shown, when the freezer cabinet loses power, the entire inverter board, including the MCU chip, loses power. When power is restored, the MCU chip resets and the compressor starts directly. At this time, the freezer system is under high pressure, causing the compressor to hit the casing during startup.

[0004] Some refrigerators require the inverter board to delay starting for 5 minutes after each power-on, waiting for the system to balance before starting the compressor. This prevents abnormal noises from the compressor starting in an unbalanced state. However, the production and testing phases of such inverter boards with software delays are quite challenging. Each power-on test requires a 5-minute wait, significantly slowing down the production cycle and increasing costs, making it impossible to meet the market's demand for rapid delivery. This is a common problem for freezer manufacturers.

[0005] In response to the above problems, how to solve the problem of long startup time of the inverter board in variable frequency freezers after power failure and power restoration has become an urgent technical problem to be solved. Utility Model Content

[0006] In view of the above-mentioned technical problems in related technologies, this utility model proposes a machine-controlled frequency converter board with intelligent delayed start, which can overcome the above-mentioned shortcomings of the prior art.

[0007] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows:

[0008] A machine-controlled frequency converter board with intelligent delayed start includes an MCU controller module, which is connected to a detection module. The detection module is connected to an inverter module and a rectifier filter module. The rectifier filter module is connected to the inverter module and an EMC module. The EMC module is connected to a signal acquisition module.

[0009] The MCU controller module includes an MCU chip. Pin 5 of the MCU chip is connected to one end of resistor R3, one end of switch SW1, and the positive terminal of capacitor C1 via resistor R4. The other end of resistor R3 is connected to the negative terminal of diode D1. The positive terminal of diode D1 is connected to a DC 5V power supply. The other end of switch SW1 and the negative terminal of capacitor C1 are both connected to ground. Pin 47 of the MCU chip is connected to a signal acquisition module, and pin 39 of the MCU chip is connected to a DC 5V power supply.

[0010] Furthermore, pins 36, 35, 34, 33, 32, 32, and 31 of the MCU chip are sequentially connected to the corresponding IGBT inverter modules.

[0011] Furthermore, the detection module includes resistors R1 and R2. Pin 1 of the MCU chip is connected to one end of resistor R1, and the other end of resistor R1 is connected to the rectifier filter module, the bus, and the inverter module. Pin 20 of the MCU chip is connected to one end of resistor R2, and the other end of resistor R2 is connected to one end of resistor Rs and the inverter module. The other end of resistor Rs is connected to the rectifier filter module.

[0012] Furthermore, the inverter module is connected to the compressor.

[0013] Furthermore, the rectifier and filter module is also connected to ground.

[0014] Furthermore, the EMC module is connected to the PE grounding wire, the AC mains power connection, one end of the enclosure temperature controller, and the negative terminal of diode D2. The positive terminal of diode D2 is connected to one end of resistor R7, and the other end of resistor R7 and the other end of the enclosure temperature controller are both connected to the signal acquisition module.

[0015] The beneficial effects of this utility model are as follows: By adding a tactile switch SW1 across capacitor C1 in the MCU controller module, this utility model can determine the voltage of capacitor C1, thereby solving the problem of compressor noise caused by unbalanced intake and exhaust pressures in the cabinet system when the inverter refrigerator or freezer is powered on again after a power outage. This solves the bottleneck problem in production testing, shortens the product production cycle, and can comprehensively reduce the purchase cost of inverter boards. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the circuit structure of the time-delay start-up machine-controlled frequency converter board according to an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the MCU controller module circuit structure of the time-delay start-up machine-controlled frequency converter board according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of a conventional delayed start structure according to an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0021] like Figure 1-2 As shown in the figure, a machine-controlled frequency converter board with intelligent delayed start according to an embodiment of the present utility model includes an MCU controller module, the MCU controller module is connected to a detection module, the detection module is connected to an inverter module and a rectifier filter module respectively, the rectifier filter module is connected to an inverter module and an EMC module respectively, and the EMC module is connected to a signal acquisition module;

[0022] The MCU controller module includes an MCU chip. Pin 5 of the MCU chip is connected to one end of resistor R3, one end of switch SW1, and the positive terminal of capacitor C1 via resistor R4. The other end of resistor R3 is connected to the negative terminal of diode D1. The positive terminal of diode D1 is connected to a DC 5V power supply. The other end of switch SW1 and the negative terminal of capacitor C1 are both connected to ground. Pin 47 of the MCU chip is connected to a signal acquisition module, and pin 39 of the MCU chip is connected to a DC 5V power supply.

[0023] In this embodiment, pins 36, 35, 34, 33, 32, 32, and 31 of the MCU chip are sequentially connected to the corresponding IGBT inverter modules.

[0024] In this embodiment, the detection module includes resistors R1 and R2. Pin 1 of the MCU chip is connected to one end of resistor R1, and the other end of resistor R1 is connected to the rectifier filter module, the bus, and the inverter module. Pin 20 of the MCU chip is connected to one end of resistor R2, and the other end of resistor R2 is connected to one end of resistor Rs and the inverter module. The other end of resistor Rs is connected to the rectifier filter module.

[0025] In this embodiment, the inverter module is connected to the compressor.

[0026] In this embodiment, the rectifier and filter module is also connected to ground.

[0027] In this embodiment, the EMC module is connected to the PE grounding wire, the AC mains power connection, one end of the enclosure temperature controller, and the negative terminal of diode D2. The positive terminal of diode D2 is connected to one end of resistor R7, and the other end of resistor R7 and the other end of the enclosure temperature controller are both connected to the signal acquisition module.

[0028] To facilitate understanding of the above-mentioned technical solutions of this utility model, the following detailed description of the above-mentioned technical solutions of this utility model is provided through specific usage methods.

[0029] In practical use, the intelligent time-delay start machine-controlled frequency converter board described in this utility model, such as... Figure 1-2 As shown, it includes an EMC module, a rectifier and filter module, an inverter module, a signal sampling module, a detection module, and an 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 voltage value of pin 5 of the MCU is determined by the discharge time of the capacitor to confirm whether the frequency converter board starts normally or continues to start with a delay. The capacitor charging circuit consists of diode D1, resistor R3, capacitor C1 and resistor R4.

[0030] Working principle: When the inverter board powers on, diode D1 and resistor R3 charge capacitor C1. Resistor R3 has a value of 10KΩ, so capacitor C1 can be fully charged quickly. When power is lost, capacitor C1 discharges through resistor R4 to pin 5 of the MCU. Resistor R4 has a value of 1MΩ. Since the MCU pin is in a high-impedance state, the discharge time of capacitor C1 is relatively long. This discharge time is used 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 approximately 3.5 minutes. To maintain the voltage for a longer time, the capacitance value can be increased.

[0031] The specific implementation process is as follows: Upon initial power-on, capacitor C1 is definitely de-charged, and the voltage at pin 5 of the MCU is <0.8V. The inverter board immediately starts the compressor and it runs normally. When a sudden power outage occurs, and power is restored shortly afterward, the inverter board starts running, and the MCU immediately reads the voltage value at pin 5. If the voltage at pin 5 of the MCU is >0.8V, the MCU determines that the cabinet power outage was recent, and capacitor C1 has not yet fully discharged. The MCU software continues to delay for 4 minutes before starting the compressor (this delay is to wait for the cabinet system pressure to balance). If the voltage at pin 5 of the MCU is <0.8V for an extended period, the MCU determines that the power outage was prolonged, and capacitor C1 has fully discharged. At this point, the compressor starts running normally. Here, 0.8V is a software-set threshold; the value read from pin 5 of the MCU is compared to this threshold for the MCU to make a judgment.

[0032] To address the bottleneck issue in the production and testing of frequency converter boards, this invention adds a tactile switch SW1 across capacitor C1. During actual production and testing, before powering on the frequency converter board, switch SW1 is pressed to discharge capacitor C1, ensuring that the frequency converter board operates immediately upon power-up.

[0033] In summary, by using the above-mentioned technical solution of this utility model, by adding a tactile switch SW1 across capacitor C1 in the MCU controller module, and by judging the voltage of capacitor C1, the problem of compressor noise caused by unbalanced intake and exhaust pressures in the cabinet system when the inverter refrigerator or freezer is powered on again after a power outage is solved. This solves the bottleneck problem in production testing, shortens the product production cycle, and can comprehensively reduce the purchase cost of inverter boards.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A machine-controlled frequency converter board with intelligent delayed start, characterized in that, The system includes an MCU controller module, which is connected to a detection module. The detection module is connected to an inverter module and a rectifier filter module. The rectifier filter module is connected to an inverter module and an EMC module. The EMC module is connected to a signal acquisition module. The MCU controller module includes an MCU chip. Pin 5 of the MCU chip is connected to one end of resistor R3, one end of switch SW1, and the positive terminal of capacitor C1 via resistor R4. The other end of resistor R3 is connected to the negative terminal of diode D1. The positive terminal of diode D1 is connected to a DC 5V power supply. The other end of switch SW1 and the negative terminal of capacitor C1 are both connected to ground. Pin 47 of the MCU chip is connected to a signal acquisition module, and pin 39 of the MCU chip is connected to a DC 5V power supply.

2. The intelligent delayed-start machine-controlled frequency converter board according to claim 1, characterized in that, Pins 36, 35, 34, 33, 32, and 31 of the MCU chip are connected sequentially to the corresponding IGBT inverter modules.

3. The intelligent delayed-start machine-controlled frequency converter board according to claim 1, characterized in that, The detection module includes resistors R1 and R2. Pin 1 of the MCU chip is connected to one end of resistor R1. The other end of resistor R1 is connected to the rectifier filter module, the bus, and the inverter module. Pin 20 of the MCU chip is connected to one end of resistor R2. The other end of resistor R2 is connected to one end of resistor Rs and the inverter module. The other end of resistor Rs is connected to the rectifier filter module.

4. The intelligent delayed-start machine-controlled frequency converter board according to claim 1, characterized in that, The inverter module is connected to the compressor, and the rectifier filter module is also connected to ground.

5. The intelligent delayed-start machine-controlled frequency converter board according to claim 1, characterized in that, The EMC module is connected to the PE grounding wire, the AC mains power connection, one end of the enclosure temperature controller, and the negative terminal of diode D2. The positive terminal of diode D2 is connected to one end of resistor R7. The other end of resistor R7 and the other end of the enclosure temperature controller are both connected to the signal acquisition module.

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