Wake-up refrigerating unit air conditioner controller with multi-stage power consumption

Abstract

The utility model relates to the technical field of refrigerating units, in particular to a wakeup multi-stage power consumption refrigerating unit air conditioner controller. The air conditioner controller comprises a CPU, an ADC module connected with the CPU, an external communication Rs485 module, a function module and a power supply system, the power supply system is provided with a plurality of power supply circuits and supplies power to different devices, the air conditioner controller enters different working states in different environments by enabling and controlling the on-off of the power supply circuits, and multi-stage power consumption is achieved. The technical scheme provided by the utility model is suitable for more application scenes, reduces the energy consumption of the product, and improves the cruising ability under the condition of limited energy storage; the automation degree is improved, the technical requirements on operators are reduced, and meanwhile, the operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of freight preservation, in particular to air-conditioning control in the freight process, and specifically to an awakenable multi-level power consumption refrigeration unit air-conditioning controller. Background Art

[0002] The refrigeration unit air conditioning controller is a very important component of the refrigerated container. It is responsible for monitoring and controlling the temperature and humidity inside the container to ensure that the goods maintain suitable storage conditions throughout the transportation process.

[0003] The air conditioning controller of the refrigeration unit is mainly composed of power supply, CPU logic processing, digital quantity acquisition and output, analog quantity acquisition, RS485 network communication, Ethernet communication, data storage, RTC and other parts. The power supply is used to supply power to each functional unit of the controller; digital acquisition and output are mainly used for protection status acquisition of each component of the controller air conditioning unit and contactor control; analog quantity acquisition and output are mainly used for ambient temperature acquisition and pressure acquisition of the air conditioning unit; RS485 network communication is mainly used for communication between sub-components of the air conditioning unit and vehicle network communication; Ethernet is mainly used for controller maintenance; data storage is mainly used for air conditioning operation data recording, parameter recording, fault recording and other functions; RTC is mainly used to maintain the power-off time of the air conditioning controller.

[0004] The air conditioning controller has two power supply conditions, one is powered by the diesel generator, and the other is powered by the battery when the diesel generator is not started.

[0005] Generally, the air conditioning controller of the refrigeration unit starts running at rated power after being powered on, without considering the actual cooling demand. However, due to limited energy storage during transportation, running at rated power all the time wastes a certain amount of energy, especially when powered by batteries, which is not conducive to endurance.

[0006] Some air conditioner controllers can be manually operated to enter and exit low power consumption mode. For example, Chinese patent CN215835152U proposes "Low power consumption air conditioner management device and equipment". This mode has high requirements for operators and is not effective in actual application. Operators will not enter or exit the low power consumption mode of the controller in time, and there is a risk of affecting the safety of goods. Summary of the invention

[0007] The present invention is proposed to solve the problems existing in the prior art.

[0008] The above purpose has not been achieved. The utility model adopts the following technical scheme: a multi-level power consumption refrigeration unit air-conditioning controller, including a CPU, an ADC module connected to the CPU, an external communication RS485 module, a functional module and a power supply system, the ADC module is connected to a temperature sensor, and the power supply system includes 1 DC24V-5V power supply circuit, 2 DC5V-3.3V power supply circuits, 1 DC3.3V voltage stabilizing circuit and 1 DC24V-3.3V power supply circuit.

[0009] The DC24V-3.3V power supply circuit is connected to a 24V DC power supply to power the CPU and the external communication RS485 module.

[0010] The DC24V-5V power supply circuit is connected to a 24V DC power supply, the two DC5V-3.3V power supply circuits are connected to the DC24V-5V power supply circuit, one DC5V-3.3V power supply circuit powers the ADC module, and the other DC5V-3.3V power supply circuit is connected to the DC3.3V voltage stabilizing circuit, and the DC3.3V voltage stabilizing circuit powers the functional module.

[0011] The DC24V-5V power supply circuit and the DC3.3V voltage stabilizing circuit are provided with an enable pin for controlling the on and off of the power supply, and the enable pin is connected to the CPU.

[0012] Furthermore, the external communication Rs485 module is connected to an external network, and the CPU receives external commands through the external communication Rs485 module.

[0013] Furthermore, the CPU controls the on and off of the DC24V-5V power supply circuit according to external instructions, and controls the on and off of the DC3.3V voltage stabilizing circuit according to the value of the temperature sensor.

[0014] Furthermore, the functional modules include a DIO module, an ETH module, an internal communication RS485 module and an LED.

[0015] In the utility model, the CPU in the air-conditioning controller receives the control instruction sent by the vehicle.

[0016] When the air-conditioning controller receives a shutdown signal from the vehicle, it cuts off the power supply to all modules except the CPU and external communication RS485 module and enters an ultra-low power consumption state. At this time, the power consumption of the controller is only 0.34W. When the air-conditioning controller receives a start signal from the vehicle, it restores the power supply of the power system and enables all modules. The power consumption of the controller is 3-6W during normal operation.

[0017] When the air-conditioning controller calculates that the air-conditioning has no cooling demand through the temperature collected by ADC, the air-conditioning unit is controlled to shut down, the power supply of the CPU, external communication RS485 module and ADC module is maintained, and the power supply of other functional modules is cut off. At this time, the power consumption of the controller is 0.9w; when the air-conditioning controller calculates that the air-conditioning needs cooling through the temperature collected by ADC, the power supply of the power system is restored, all modules are enabled, and the controller works normally.

[0018] Beneficial effects: The technical solution proposed by the utility model is suitable for more application scenarios, reduces product energy consumption, and improves endurance under limited energy storage conditions; it improves the degree of automation, reduces the technical requirements for operators, and reduces operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the equipment connection of the utility model.

[0020] Figure 2 This is the schematic diagram of the DC24V-5V power supply circuit.

[0021] Figure 3 This is the schematic diagram of the DC5V-3.3V power supply circuit.

[0022] Figure 4 This is the schematic diagram of the DC3.3V voltage regulator circuit.

[0023] Figure 5 This is the schematic diagram of the DC24V-3.3V power supply circuit.

[0024] Figure 6 This is another schematic diagram of a DC5V-3.3V power supply circuit.

[0025] Figure 3 The power supply circuit given is used to supply power to other circuits. Figure 6 The power supply circuit given is used to power the ADC module. Figure 1 In the case of DC5V-3.3V Figure 3 The power supply circuit shown is DC5V-REF3.3. Figure 6 The power supply circuit shown. DETAILED DESCRIPTION

[0026] The following is a further description of the present invention by way of examples in conjunction with the accompanying drawings. The embodiments described below are only for the purpose of illustrating the present invention and do not constitute a limitation thereto.

[0027] The utility model improves the existing air conditioning controller and proposes a multi-level power consumption refrigeration unit air conditioning controller. Figure 1The air conditioning controller includes a CPU, an ADC module connected to the CPU, an external communication RS485 module, a functional module and a power supply system. The ADC module is connected to a temperature sensor. The power supply system includes 1 DC24V-5V power supply circuit, 2 DC5V-3.3V power supply circuits, 1 DC3.3V voltage regulator circuit and 1 DC24V-3.3V power supply circuit.

[0028] The DC24V-3.3V power supply circuit connects to a 24V DC power supply to power the CPU and external communication RS485 module.

[0029] The DC24V-5V power supply circuit is connected to a 24V DC power supply, and two DC5V-3.3V power supply circuits are connected to the DC24V-5V power supply circuit. One DC5V-3.3V power supply circuit (indicated as DC5V-REF3.3 in the figure) powers the ADC module, and the other DC5V-3.3V power supply circuit is connected to a DC3.3V voltage regulator circuit, and the DC3.3V voltage regulator circuit powers the functional module.

[0030] The DC24V-5V power supply circuit and the DC3.3V voltage regulator circuit are set to control the power on and off enable pin ( Figure 1 In the figure, it is represented as Enable), and the enable pin is connected to the CPU.

[0031] The air conditioning controller for refrigeration units is a mature industrial product. The figure shows the improved parts but does not show its complete structure.

[0032] The 24V DC power supply is the power provided by the vehicle, powered by a diesel generator or by a battery.

[0033] The external communication RS485 module is connected to the external network, and the CPU receives external commands from the vehicle through the external communication RS485 module.

[0034] Functional modules include DIO module, ETH module, internal communication Rs485 module and LED.

[0035] The figure does not distinguish between the RS485 modules, and the positions of the two modules can be seen from the connection relationship.

[0036] This embodiment can provide three working modes of the air-conditioning controller: an ultra-low power consumption working mode, a low power consumption working mode and a normal working mode.

[0037] Ultra-low power working mode: The CPU controls the enable pin of the DC24V-5V power supply circuit and disconnects the DC24V-5V power supply circuit. At this time, only the CPU and the external communication RS485 module of the air-conditioning controller are powered and work normally, and the power consumption is only 0.34w. The condition for entering this mode is that the vehicle sends a shutdown signal or receives a power supply mode sent by the vehicle, which is battery power supply, and the way to receive the vehicle signal is external communication RS485. When working in ultra-low power mode, the air-conditioning controller can still receive signal information sent by the vehicle through the external communication RS485 module. When receiving the air-conditioning start signal sent by the vehicle, the IO pin of the CPU in the air-conditioning controller controls the DC24V-5V power supply circuit and the DC3.3V voltage regulator circuit to enable, so that the DC24V-5V power supply circuit starts to output 5V, and the DC3.3V voltage regulator circuit starts to output 3.3V, so that all functional modules of the controller are powered and work normally.

[0038] Low-power working mode: When the air-conditioning controller calculates that there is no cooling demand through the temperature collected by ADC, the air-conditioning unit is controlled to shut down and automatically enter the low-power state. The IO pin of the CPU controls the DC24V-5V power supply circuit to enable and the DC3.3V voltage regulator circuit to cancel, so that the DC3.3V voltage regulator circuit stops outputting 3.3V, thereby cutting off the power of the controller's DIO, ETH, some RS485, LED and other functional modules, reducing the overall power consumption of the controller. At this time, the power consumption of the controller is only 0.9w, and the power consumption of the controller is 3-6w during normal operation.

[0039] In low power consumption mode, the air conditioner controller can still obtain the ambient temperature. When it is judged that the air conditioner has cooling demand through the ambient temperature, the IO pin of the CPU controls the DC3.3V voltage regulator circuit to enable, so that the DC3.3V voltage regulator circuit starts to output 3.3V, thereby enabling the controller's DIO, ETH, Rs485, LED and other functional modules to be powered and work normally.

[0040] Normal working mode: When the air conditioning controller receives an external start signal or determines that the air conditioning has a cooling demand through the ambient temperature, it can control itself to enter the normal working mode through the CPU. After entering the normal working mode, all functions of the air conditioning controller operate normally, and the air conditioning controller can control the air conditioning unit normally.

[0041] In the air conditioner controller, there may be devices that require 5V power supply, and the DC24V-5V power supply circuit supplies power to them. In the ultra-low power working mode and the low power working mode, these devices do not need to work. A DC5V voltage regulator circuit with controllable on and off can be set between the DC24V-5V power supply circuit and the devices that require 5V power supply. In the above two modes, the DC5V voltage regulator circuit is disabled, and the DC5V voltage regulator circuit is enabled in the normal working mode.

[0042] See also Figure 2-Figure 6 , the two enable pins are POWER_ON and 3.3V_EN.

[0043] 1. When the air conditioner controller is in normal working mode: the POWER_ON signal and the 3.3V_EN signal are in the enabled state, and the DVCC5_0 power network, the DVCC3_3_1 power network, and the REF3_3 power network are in the powered state.

[0044] See also Figure 2 , DC24V-5V is converted by the U18 power chip. When the enable pin POWER_ON signal is high (CPU pin outputs 3.3V), the POWER_ON signal is in the enabled state, Q1 is turned on, and pin 5 of U18 is in the low level (0V) state. At this time, the power conversion chip U18 is enabled, pin 2 of U18 outputs DC5.5V voltage, and the DVCC5_0 power network is energized.

[0045] See also Figure 4 The DC3.3V voltage regulator circuit is controlled by Q2 and Q3, and its enable pin 3.3V_EN signal is high level (CPU pin outputs 3.3V), the 3.3V_EN signal is in the enabled state, Q3 is turned on, Q2 is turned on, and the DVCC3_3_1 power supply network is energized.

[0046] See also Figure 6 , DC5V-3.3V is converted by the U21 power chip, there is no enable pin, if the DVCC5_0 power network has power, the REF3_3 power network will be powered.

[0047] See also Figure 3 , DC5V-3.3V is converted by the U19 power chip, there is no enable pin, if the DVCC5_0 power network has power, the DVCC3_3 power network will be powered.

[0048] See also Figure 5 , DC24V-3.3V is converted by the U20 power chip, there is no enable pin, if the DVCC24 power network has power, the DVCC3_3 power network will be powered.

[0049] In summary, when the POWER_ON signal and the 3.3V_EN signal are in the enabled state, all power networks are powered normally, all functional modules of the controller can work normally, and the controller is in a normal energy consumption state.

[0050] 2. When the air conditioner controller is in the ultra-low power working mode: the POWER_ON signal and the 3.3V_EN signal are in the disabled state, and the DVCC5_0 power network, the DVCC3_3_1 power network, and the REF3_3 power network are in the power-off state.

[0051] DC24V-5V is converted by the U18 power chip. When the enable pin POWER_ON signal is low (0V), the POWER_ON signal is in a disabled state, Q1 is turned off, and pin 5 of U18 is in a high level (24V) state. At this time, the power conversion chip U18 is disabled, pin 2 of U18 outputs 0V voltage, and the DVCC5_0 power network loses power.

[0052] The DC3.3V voltage regulator circuit is controlled by Q2 and Q3, and its enable pin 3.3V_EN signal is low level (0V), the 3.3V_EN signal is in a non-enabled state, Q3 is turned off, Q2 is turned off, and the DVCC3_3_1 power supply network loses power.

[0053] See also Figure 6 , DC5V-3.3V is converted by the U21 power chip, there is no enable pin, and if the DVCC5_0 power network has no power, the REF3_3 power network will lose power.

[0054] See also Figure 3 , DC5V-3.3V is converted by the U19 power chip, there is no enable pin, and if the DVCC5_0 power network has no power, the DVCC3_3 power network will lose power.

[0055] See also Figure 5 , DC24V-3.3V is converted by the U20 power chip, there is no enable pin, if the DVCC24 power network has power, the DVCC3_3 power network will be powered.

[0056] In summary, when the POWER_ON signal and the 3.3V_EN signal are in the disabled state, the DVCC5_0, DVCC3_3_1, and REF3_3 power networks lose power, thereby cutting off power to the controller's DIO, ETH, internal communication RS485, LED, ADC and other functional modules, reducing the overall power consumption of the controller, keeping the CPU and external communication RS485 modules powered, so that the controller can be awakened through the RS485 network to exit the ultra-low power state.

[0057] 3. When the air conditioner controller is in low power working state: the POWER_ON signal is in the enabled state, the 3.3V_EN signal is in the disabled state, and the DVCC3_3_1 power network is in the power-off state.

[0058] When the 3.3V_EN signal is in the disabled state, DVCC3_3_1 and the power network lose power, which in turn causes the controller's DIO, ETH, internal communication RS485, LED and other functional modules to lose power, reducing the overall power consumption of the controller. The POWER_ON signal is in the enabled state, keeping the CPU and external communication RS485 and ADC modules powered, so that the controller can exit the low power mode through ambient temperature calculation. At the same time, the CPU can communicate with the vehicle through the external communication RS485 module.

[0059] The air conditioning controller enters the ultra-low power working mode and enters the normal working mode when the CPU controls the on-off of the DC24V-5V power supply circuit according to external instructions for conversion; the air conditioning controller enters the low power working mode and enters the normal working mode when the CPU controls the on-off of the DC3.3V voltage stabilizing circuit according to the value of the temperature sensor and automatically performs wake-up switching.

[0060] The temperature sensor is set in the cargo hold to collect the temperature in the cargo hold, and the conditions for entering and exiting the low power working mode are agreed in advance and written into the CPU.

[0061] The CPU is the core component of the air conditioner controller. To ensure its operation, in this embodiment, Figure 1 The DC5V to DC3.3V power supply circuit connected to the DC3.3V voltage regulator circuit shown in the figure supplies power to the CPU and the external communication RS485 module. In this way, two power supplies are provided for the CPU, and the CPU can monitor whether the two power supply circuits are normal by detecting whether the external module is working after enabling the DC24V-5V power supply circuit and the DC3.3V voltage regulator circuit. It can also determine whether the DC24V-3.3V power supply circuit is normal after cutting off the DC24V-5V power supply circuit if the CPU is powered off.

[0062] Although the embodiments of the present invention have been shown and described above, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wake-up multi-level power consumption refrigeration unit air conditioning controller, comprising a CPU, an ADC module connected to the CPU, an external communication RS485 module, a functional module and a power supply system, characterized in that: The ADC module is connected to a temperature sensor, and the power supply system includes 1 DC24V-5V power supply circuit, 2 DC5V-3.3V power supply circuits, 1 DC3.3V voltage stabilizing circuit and 1 DC24V-3.3V power supply circuit; The DC24V-3.3V power supply circuit is connected to a 24V DC power supply to power the CPU and the external communication RS485 module; The DC24V-5V power supply circuit is connected to a 24V DC power supply, the two DC5V-3.3V power supply circuits are connected to the DC24V-5V power supply circuit, one DC5V-3.3V power supply circuit supplies power to the ADC module, and the other DC5V-3.3V power supply circuit is connected to the DC3.3V voltage stabilizing circuit, and the DC3.3V voltage stabilizing circuit supplies power to the functional module; The DC24V-5V power supply circuit and the DC3.3V voltage stabilizing circuit are provided with an enable pin for controlling the on and off of the power supply, and the enable pin is connected to the CPU.

2. The air conditioning controller according to claim 1, characterized in that: The external communication Rs485 module is connected to an external network, and the CPU receives external commands through the external communication Rs485 module.

3. The air conditioning controller according to claim 2, characterized in that: The CPU controls the on and off of the DC24V-5V power supply circuit according to external instructions, and controls the on and off of the DC3.3V voltage stabilizing circuit according to the value of the temperature sensor.

4. The air conditioning controller according to claim 1, characterized in that: The functional modules include a DIO module, an ETH module, an internal communication RS485 module and an LED.

5. The air conditioning controller according to claim 1, characterized in that: The DC5V-3.3V power supply circuit connected to the DC3.3V voltage stabilizing circuit supplies power to the CPU and the external communication RS485 module.

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