Refrigerated container control circuit

Abstract

The invention discloses a control circuit of a refrigerated container, which relates to the technical field of circuit control and comprises a relay control unit formed by a triode Q3 and a triode Q4 which are arranged in parallel, a switch triode Q1 and a switch triode Q2 which are arranged in parallel, and an amplification triode Q6 and an amplification triode Q5 which are arranged in parallel, the collector electrode of the switch triode Q2 is connected to the emitter electrode of the amplification triode Q5, the collector electrode of the switch triode Q1 is connected to the emitter electrode of the amplification triode Q6, and a TVS tube 7 is connected in series between the collector electrode of the switch triode Q1 and the emitter electrode of the amplification triode Q5. The device has the technical advantages that the relay control unit effectively prevents the relay from being disconnected under the condition of unstable voltage, and the stability of the refrigerated container in a power receiving state is improved; by arranging the TVS tube 7, the relay circuit can be protected, and the main body of the relay circuit is effectively prevented from being burnt down; and through the plug-in terminal and the annular turning plate, the power supply posture is inclined, so that the rainwater-proof effect in power supply is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of circuit control, and in particular to a refrigerated container control circuit. Background Art

[0002] With the booming cold chain logistics industry, refrigerated containers, as a key link in protecting the quality and safety of temperature-sensitive goods, are increasingly attracting industry attention for their performance and reliability. Traditional refrigerated container technology emphasizes maintaining a constant and suitable temperature environment inside the box, which relies on the stable operation of the refrigeration system, and the continuous operation of the system is based on a reliable power supply. During long-distance transportation or short stops, traditional strategies tend to rely on external power sources (such as port facilities, storage centers, or portable generators) to ensure uninterrupted operation of the refrigeration system. In this process, the safety and stability of the power supply link become top priorities, because any power outages or line abnormalities may directly affect the refrigeration efficiency, and thus pose a risk to the freshness and quality of the goods in the box. Therefore, improving the stability and safety of the power supply system is crucial to ensuring the quality of goods throughout the cold chain logistics process.

[0003] In the daily operation of refrigerated containers, ensuring the stability and safety of system operation is one of the key challenges faced by technicians, especially how to quickly and effectively cut off the power supply when facing a circuit failure, or maintain the connection of the relay when the circuit is unstable, in order to prevent potential electrical disasters and protect the integrity of the goods and equipment inside the container. This has become a technical problem that the industry urgently needs to overcome; in addition, when the refrigerated container is connected to an external power source, the connection process of the plug should not be ignored. The design of the plug must fully consider the needs of dust and rain protection to ensure that good electrical contact can be maintained under all weather conditions; before the official power supply, it is also necessary to introduce a detection mechanism for the plug connection status to prevent power outages or short circuits caused by poor contact and avoid unnecessary losses. Summary of the invention

[0004] The device provides a refrigerated container control circuit, and the specific implementation is as follows:

[0005] The relay control unit is composed of transistors Q3 and Q4 arranged in parallel, the emitters of the transistors are connected in series with resistors R25 and R24 respectively and then connected to 12V VCC, the base of the transistor Q3 is connected to the RLY ON signal through resistor R30, and the base of the transistor Q4 is connected to the RLY OFF signal through resistor R31;

[0006] The switch transistor Q1 and the switch transistor Q2 are arranged in parallel, the base of the switch transistor Q1 is connected to the emitter of the transistor Q3 through the resistor R27, the base of the switch transistor Q2 is connected to the emitter of the transistor Q4 through the resistor R26, and the emitters of the switch transistor Q1 and the switch transistor Q2 are both connected to the 12V VCC;

[0007] The amplifying transistor Q6 and the amplifying transistor Q5 are arranged in parallel, the collector of the switching transistor Q2 is connected to the emitter of the amplifying transistor Q5, the collector of the switching transistor Q1 is connected to the emitter of the amplifying transistor Q6, and a TVS tube 7 is connected in series between the collector of the switching transistor Q1 and the emitter of the amplifying transistor Q5, the collector of the switching transistor Q2 is connected in series with the pin 1 of OUT1, and the collector of the switching transistor Q1 is connected in series with the pin 2 of OUT1;

[0008] The bases of transistors Q3, Q4, Q6 and Q5 are connected in series with resistors and then connected to GND, and the collectors of Q6 and Q5 are directly connected to GND. The collectors of transistors Q3 and Q4 are connected in series with resistors R36 and R35 and then connected to GND. The relay control unit uses the principle of magnetic holding to effectively prevent the relay from being disconnected in the case of unstable voltage. TVS tube 7 is used for circuit protection and burn-in prevention.

[0009] Based on the above technical solution, by configuring a relay control unit, the risk of accidental disconnection of the relay during voltage fluctuations is effectively avoided, and the stability of the refrigerated container during the power supply process is significantly enhanced.

[0010] Preferably, it also includes an optical isolator U7, whose pin 1 is connected to the RLY ON signal, whose pin 2 is connected to GND through a resistor R53, and whose pin 3 is directly connected to GND. It also includes resistors R46 and R49 arranged in parallel, one end of which is connected to the 3.3V VCC, and the other end is connected to pin 4 of the optical isolator U7, and a light-emitting diode D16 is connected in series to the resistor R46. Pin 4 of the optical isolator U7 is also connected to the PINT ON signal through a resistor R51, and the PINT ON signal is connected to pin 41 of the controller.

[0011] Preferably, it also includes an optical isolator U8, whose pin 1 is connected to the RLY OFF signal, whose pin 2 is connected to GND through a resistor R54, and whose pin 3 is directly connected to GND. It also includes resistors R50 and R47 arranged in parallel, one end of which is connected to the 3.3V VCC, and the other end is connected to pin 4 of the optical isolator U8, and a light-emitting diode D17 is connected in series to the resistor R47. Pin 4 of the optical isolator U8 is also connected to the PINT OFF signal through a resistor R51, and the PINT OFF signal is connected to pin 42 of the controller.

[0012] Preferably, it also includes an optocoupler U4, whose pin 1 is connected to the 12V VCC through a resistor R32, and whose pin 2 is connected to the CloseState LED signal, and whose pin 2 is also connected to the pin 1 of P4, and the pin 2 of P4 is connected to GND; it also includes resistors R28 and resistors R29 arranged in parallel, one end of both of which is connected to the 3.3V VCC, and the other end is connected to the pin 4 of the optocoupler U4, and the resistor R28 is connected in series with a light-emitting diode D12, the pin 4 of the optocoupler U4 is also connected to the Closed State signal through a resistor R33, the pin 3 of the optocoupler U4 is connected to GND, and the Closed State signal is connected to pin 73 of the controller.

[0013] Preferably, it also includes an optocoupler U5, whose pin 2 is connected to pin 2 of P5, pin 1 of the optocoupler U5 is connected to 12V VCC through resistor R42 and pin 3 of P5 respectively, and pin 1 of P5 is connected to GND; it also includes resistors R38 and resistor R40 arranged in parallel, one end of both is connected to 3.3V VCC, and the other end is connected to pin 4 of the optocoupler U5, and a light-emitting diode D13 is connected in series to the resistor R38, pin 4 of the optocoupler U5 is also connected to the power status signal through resistor R43, pin 3 of the optocoupler U5 is connected to GND, and the power status signal is connected to pin 31 of the controller.

[0014] Preferably, it also includes a switch SW1 and a switch SW2, wherein pin 1 of the two are connected, pin 2 of the switch SW1 and pin 2 of the switch SW2 are both connected to 3.3V VCC, pin 3 of the switch SW1 is connected to the KEY ON signal, and pin 3 of the switch SW2 is connected to the KEY OFF signal; the 12V VCC is connected to the CloseState LED signal via a lighted push button switch, the 5V VCC is connected to pin 3 of the transistor Q7 via a lighted push button switch, the RUN EN signal is connected to pin 1 of the transistor Q7 after being connected in series with a resistor R39, and the RUN EN signal after being connected in series with the resistor R39 is connected to GND via a resistor R41, pin 2 of the transistor Q7 is also connected to GND, and the RUN EN signal is connected to pin 58 of the controller.

[0015] Preferably, it also includes a relay U6, whose pin 2 is connected to the KEY ON signal, whose pin 3 is connected to the RLY ON signal, whose pin 4 is connected to the OUT ON signal, whose pin 5 is connected to the OUT OFF signal, whose pin 6 is connected to the RLY OFF signal, and whose pin 7 is connected to the KEY OFF signal, and the OUT OFF signal and the OUT ON signal are respectively connected to pins 57 and 54 of the controller; the relay U6 and the diode D15 are arranged in parallel, one end of both is connected to the 5V VCC, and the other end and the 5V VCC after the series resistor R44 and the light-emitting diode D14 are connected to pin 3 of the transistor Q8, the pin 1 of the transistor Q8 is connected to the OUT EN signal through the resistor R48, and the pin 2 of the transistor Q8 is connected to GND, the OUT EN signal after the series resistor R48 is connected to GND through the resistor R45, and the OUT EN signal is connected to pin 43 of the controller.

[0016] Preferably, it also includes a power supply unit consisting of a fixed cylinder and an annular flap plate that are hinged to each other, a socket is provided in the fixed cylinder at an angle downward, a plug-in terminal is built into the annular flap plate, and a reset member and a locking member are provided at the hinge, the front side of the plug-in terminal is used for plugging in a refrigeration plug, and the back side is used for plugging in a socket.

[0017] Preferably, a photoelectric switch for detecting whether the plug-in terminal is plugged in place is vertically provided at the bottom of the fixed cylinder through an extension plate, and an open groove for avoiding the photoelectric switch is provided on the bottom plate of the annular flip plate; a rubber telescopic sleeve for sealing is provided at the matching gap between the fixed cylinder and the annular flip plate, and an observation window for visually checking whether the plug-in terminal is plugged in place is also provided on the fixed cylinder.

[0018] Preferably, the locking member includes a mounting tube sleeved on the outside of the rotating shaft, an angle sensor for detecting the rotation angle of the rotating shaft is provided at the end of the mounting tube, and a limiting protrusion is provided on the part of the rotating shaft located in the mounting tube; a telescopic member is integrated on the mounting tube, and a limiting block is provided at the output end of the telescopic member which can be laterally inserted into the mounting tube, and the limiting block can be inserted into the mounting tube to lock the limiting protrusion.

[0019] Based on the above technical solution, a transition structure is constructed between the refrigerated container plug and the oblique socket by configuring the plug terminal and the annular flip plate. Not only can the locking part be triggered in the event of a fault to achieve mechanical safety disengagement and effectively ensure safety in use; but its power supply posture is set to an inclined state, thus ensuring excellent rain and water protection during the power supply process.

[0020] In summary, this application includes the following beneficial technical effects:

[0021] 1. The present invention effectively prevents the disconnection of the relay under unstable voltage conditions by setting a relay control unit, thereby improving the stability of the refrigerated container under power-receiving conditions;

[0022] 2. The present invention can protect the relay circuit by providing the TVS tube 7, thereby effectively preventing the main body from being burned;

[0023] 3. In the present invention, by providing a plug-in terminal and an annular flip plate, a transition structure is formed between the refrigerated container plug and the oblique socket, which not only ensures the safety protection of triggering the locking member for mechanical disengagement during the use of a fault, but also makes the power supply posture inclined to ensure the rain and water immersion effect during the power supply process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The circuit principle of the relay control unit in the present invention is Figure 1 ;

[0025] Figure 2 It is a circuit schematic diagram of the closed state signal in the present invention;

[0026] Figure 3 It is a circuit schematic diagram of the power state signal in the present invention;

[0027] Figure 4 The circuit principle of the relay control unit in the present invention is Figure 2 ;

[0028] Figure 5 It is a circuit schematic diagram of the PLY ON signal in the present invention;

[0029] Figure 6 It is a circuit schematic diagram of the PLY OFF signal in the present invention;

[0030] Figure 7 It is the circuit schematic diagram of the relay U6 in the present invention;

[0031] Figure 8 It is a circuit schematic diagram of the controller in the present invention;

[0032] Fig. 9 is a side structural schematic diagram of the power supply unit in the present invention;

[0033] Fig.10 It is a schematic diagram of the exploded structure of the power supply unit in the present invention;

[0034] Fig.11 It is a right view structural schematic diagram of the power supply unit in the present invention;

[0035] Fig.12 It is a schematic diagram of the structure of the annular flap in the present invention;

[0036] Fig.13 It is a schematic diagram of the explosion structure of the annular flap in the present invention;

[0037] Fig.14It is a cross-sectional schematic diagram of the annular flap structure in the present invention.

[0038] Description of reference numerals:

[0039] 1. Fixed cylinder, 2. Socket, 3. Extension plate, 4. Photoelectric switch, 5. Plug terminal, 6. Annular flip plate, 7. Fitting clearance, 8. Rotating shaft, 9. Reset part, 10. Locking part, 11. Angle sensor,

[0040] 101. Observation window, 601. Open slot, 801. Limiting protrusion, 1001. Mounting tube, 1002. Telescopic member, 1003. Limiting block. DETAILED DESCRIPTION

[0041] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments:

[0042] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0043] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0044] The following is combined with Figure 1-14 This application is described in further detail.

[0045] An embodiment of the present application discloses a refrigerated container control circuit.

[0046] Example 1

[0047] Reference Figures 1 to 8 This embodiment discloses a refrigerated container control circuit, including a relay control unit composed of a transistor Q3 and a transistor Q4 arranged in parallel, the emitters of the two transistors are respectively connected in series with a resistor R25 and a resistor R24 ​​and then connected to a 12V VCC, the base of the transistor Q3 is connected to an RLY ON signal through a resistor R30, and the base of the transistor Q4 is connected to an RLY OFF signal through a resistor R31;

[0048] The switch transistor Q1 and the switch transistor Q2 are arranged in parallel, the base of the switch transistor Q1 is connected to the emitter of the transistor Q3 through the resistor R27, the base of the switch transistor Q2 is connected to the emitter of the transistor Q4 through the resistor R26, and the emitters of the switch transistor Q1 and the switch transistor Q2 are both connected to the 12V VCC;

[0049] The amplifying transistor Q6 and the amplifying transistor Q5 are arranged in parallel, the collector of the switching transistor Q2 is connected to the emitter of the amplifying transistor Q5, the collector of the switching transistor Q1 is connected to the emitter of the amplifying transistor Q6, and a TVS tube 7 is connected in series between the collector of the switching transistor Q1 and the emitter of the amplifying transistor Q5, the collector of the switching transistor Q2 is connected in series with the pin 1 of OUT1, and the collector of the switching transistor Q1 is connected in series with the pin 2 of OUT1;

[0050] The bases of transistors Q3, Q4, Q6 and Q5 are connected to GND in series with resistors, and the collectors of Q6 and Q5 are directly connected to GND. The collectors of transistors Q3 and Q4 are connected to GND in series with resistors R36 and R35. In this structure, the bases of transistors Q3, Q4, Q6 and Q5 are connected to GND in series with resistors R37, R34, R35 and R36, respectively. In this structure, resistors R30, R34, R37 and R31 are connected to GND in series. , resistor R25, resistor R24 ​​are 5.1K-5%, resistor R35, resistor R36, resistor R27, resistor R26 are 1K-5%, TVS tube 7 uses SMBJ30CA, switching transistor Q1 and switching transistor Q2 both use MMBT2907A, transistor Q4 uses 2SC1623, amplifying transistor Q8 and amplifying transistor Q5 use MMBT2222A, the bases of transistor Q3, transistor Q4, amplifying transistor Q6 and amplifying transistor Q5 are respectively connected in series with resistor R37, resistor R34, resistor R35 and resistor R36 and then connected to GND.

[0051] It also includes an optocoupler U4, whose pin 1 is connected to the 12V VCC through a resistor R32, and whose pin 2 is connected to the CloseState LED signal, and whose pin 2 is also connected to the pin 1 of P4, and the pin 2 of P4 is connected to GND, and also includes resistors R28 and R29 arranged in parallel, one end of both of which is connected to the 3.3V VCC, and the other end is connected to the pin 4 of the optocoupler U4, and the resistor R28 is connected in series with a light-emitting diode D12, and the pin 4 of the optocoupler U4 is also connected to the Closed State signal through a resistor R33, and the pin 3 of the optocoupler U4 is connected to GND, and the Closed State signal is connected to pin 73 of the controller. In this structure, the resistors R32, R28, and R33 are selected from 1K-5%, and the resistor R29 is selected from 10K-5%. The optocoupler U4 is selected as LTV-214-G.

[0052] It also includes an optical coupler U5, whose pin 2 is connected to the pin 2 of P5, and the pin 1 of the optical coupler U5 is connected to the 12V VCC through the resistor R42 and the pin 3 of P5 respectively, and the pin 1 of P5 is connected to GND, and also includes resistors R38 and R40 arranged in parallel, one end of both is connected to the 3.3V VCC, and the other end is connected to the pin 4 of the optical coupler U5, and the resistor R38 is connected in series with a light-emitting diode D13, the pin 4 of the optical coupler U5 is also connected to the power status signal through the resistor R43, the pin 3 of the optical coupler U5 is connected to GND, and the power status signal is connected to the 31st pin of the controller. In this structure, the resistors R43, R38, and R42 are selected from 1K-5%, the resistor R40 is selected from 10K-5%, and the optical coupler U5 is selected from LTV-214-G.

[0053] It also includes a switch SW1 and a switch SW2, wherein pins 1 of the two are connected, pins 2 of the switch SW1 and 2 of the switch SW2 are both connected to 3.3V VCC, pin 3 of the switch SW1 is connected to a KEY ON signal, pin 3 of the switch SW2 is connected to a KEY OFF signal, 12V VCC is connected to a CloseState LED signal via a lighted push button switch, 5V VCC is connected to pin 3 of the transistor Q7 via a lighted push button switch, a RUN EN signal is connected to pin 1 of the transistor Q7 after being connected in series with a resistor R39, and the RUN EN signal after being connected in series with the resistor R39 is connected to GND via a resistor R41, pin 2 of the transistor Q7 is also connected to GND, and the RUN EN signal is connected to pin 58 of the controller. In this structure, resistor R39 is selected as 1K-5%, resistor R41 is selected as 10K-5%, and transistor Q7 is selected as S8050-J3Y.

[0054] Pin 2 of relay U6 is connected to the KEY ON signal, pin 3 is connected to the RLY ON signal, pin 4 is connected to the OUT ON signal, pin 5 is connected to the OUT OFF signal, pin 6 is connected to the RLY OFF signal, and pin 7 is connected to the KEY OFF signal. The OUT OFF signal and the OUT ON signal are connected to pins 57 and 54 of the controller respectively. Relay U6 and diode D15 are arranged in parallel, one end of both is connected to the 5V VCC, and the other end and the 5V VCC after the series resistor R44 and the light-emitting diode D14 are connected to pin 3 of transistor Q8. Pin 1 of transistor Q8 is connected to the OUT EN signal through resistor R48, and pin 2 of transistor Q8 is connected to GND. The OUTEN signal after the series resistor R48 is connected to GND through resistor R45. The EN signal is connected to pin 43 of the controller. In this structure, resistors R44, R48, and R53 are 1K-5%, resistor R45 is 10K-5%, diode D15 is M7-1N4007, transistor Q8 is 8050-J3Y, and relay U6 is G6K-2F-Y-5V.

[0055] The specific principle is: the RLY OFF signal and the RLY ON signal are connected in parallel, and the control principles of the two are the same. Take the RLY ON signal as an example; when the RLY ON signal is not introduced, the emitter and base of the switching transistor Q2 are both 12V. In this state, the collector of the switching transistor Q2 displays an off signal; when the RLY ON signal is introduced, the switching transistor Q4 acts to make the collector of the switching transistor Q2 keep displaying an on signal.

[0056] Example 2

[0057] Reference Figure 5 and Figure 6 Based on the above embodiments, this embodiment further discloses a refrigerated container control circuit, which also includes an optical isolator U7 and an optical isolator U8.

[0058] Pin 1 of the opto-isolator U7 is connected to the RLY ON signal, its pin 2 is connected to GND through a resistor R53, its pin 3 is directly connected to GND, and it also includes resistors R46 and R49 arranged in parallel, one end of both are connected to the 3.3V VCC, and the other end is connected to pin 4 of the opto-isolator U7, and a light-emitting diode D16 is connected in series to the resistor R46. Pin 4 of the opto-isolator U7 is also connected to the PINTON signal through a resistor R51, and the PINT ON signal is connected to pin 41 of the controller. In this structure, resistors R46, R51, and R53 are selected from 1K-5%, resistor R49 is selected from 10K-5%, and the optocoupler U7 is selected from LTV-214-G.

[0059] Pin 1 of the opto-isolator U8 is connected to the RLY OFF signal, its pin 2 is connected to GND through resistor R54, its pin 3 is directly connected to GND, and it also includes resistors R50 and R47 arranged in parallel, one end of both are connected to 3.3V VCC, and the other end is connected to pin 4 of the opto-isolator U8, and a light-emitting diode D17 is connected in series to the resistor R47. Pin 4 of the opto-isolator U8 is also connected to the PINT OFF signal through resistor R51, and the PINT OFF signal is connected to pin 42 of the controller. In this structure, resistors R46, R51, R47, R52, and R53 are 1K-5%, resistor R50 is 10K-5%, resistor R54 is 10K-1%, and the optocoupler U8 is selected as LTV-214-G.

[0060] Example 3

[0061] Reference Figures 9 to 14 Based on the above embodiment, the present embodiment further discloses a refrigerated container control circuit, which also includes a power supply unit composed of a fixed cylinder 1 and an annular flip plate 6 that are hinged to each other. A socket 2 is provided in the fixed cylinder 1 and tilted downward. A plug-in terminal 5 is built into the annular flip plate 6, and a reset member 9 and a locking member 10 are provided at the hinge. The front side of the plug-in terminal 5 is used to plug in a refrigerated plug, and the back side is used to plug in the socket 2. The reset member 9 is a constant torque structure composed of two rotating cylinders and a coil spring, and any rotating cylinder is coaxially arranged with the hinge.

[0062] A photoelectric switch 4 for detecting whether the plug-in terminal 5 is plugged in place is vertically arranged at the bottom of the fixed cylinder 1 through the extension plate 3, and an open groove 601 for avoiding the photoelectric switch 4 is provided on the bottom plate of the annular flip plate 6. In this structure, a rubber telescopic sleeve for sealing is provided at the matching gap 7 between the fixed cylinder 1 and the annular flip plate 6, and an observation window 101 for visually checking whether the plug-in terminal 5 is plugged in place is also provided on the fixed cylinder 1.

[0063] The locking member 10 includes a mounting tube 1001 which is sleeved on the outside of the rotating shaft 8. An angle sensor 11 for detecting the rotation angle of the rotating shaft 8 is provided at the end of the mounting tube 1001, and a limiting protrusion 801 is installed on the part of the rotating shaft 8 located in the mounting tube 1001. In this structure, a telescopic member 1002 is integrated on the mounting tube 1001. The telescopic member 1002 is a cylinder structure, and a limiting block 1003 which can be laterally inserted into the mounting tube 1001 is provided at its output end. The limiting block 1003 can be inserted into the mounting tube 1001 to lock the limiting protrusion 801.

[0064] The specific implementation process is: in the initial state, the annular flip plate 6 and the plug-in terminal 5 are vertical; the plug of the refrigerated container is inserted into the plug-in terminal 5; then the plug-in terminal 5 and the plug of the refrigerated container are pushed around the rotating shaft 8 to connect the plug-in terminal 5 with the socket 2; at this time, the plug-in terminal 5, the socket 2 and the plug of the refrigerated container are all arranged obliquely relative to the fixed cylinder 1, which can effectively prevent water immersion.

[0065] The angle sensor 11 and the photoelectric switch 4 are electrically connected to the controller. During the rotation of the shaft 8, the angle sensor 11 is triggered and the rotation angle of the shaft 8 is detected. When the shaft 8 rotates to the plug-in position, the plug-in terminal 5 triggers the photoelectric switch 4 to prove that it is plugged in place. After being plugged in place, the telescopic member 1002 pushes the limit block 1003 into the installation tube 1001, and the limit block 1003 is combined with the limit protrusion 801 to prevent the shaft 8 from resetting. If the photoelectric switch 4 is not triggered and the detection angle of the angle sensor 11 is normal, the relay control unit cannot be turned on, and the photoelectric switch 4 needs to be repaired at this time.

[0066] Many other changes and modifications may be made without departing from the concept and scope of the present invention.It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A refrigerated container control circuit, characterized in that: include: The relay control unit is composed of transistors Q3 and Q4 arranged in parallel, the emitters of the transistors are connected in series with resistors R25 and R24 respectively and then connected to 12V VCC, the base of the transistor Q3 is connected to the RLY ON signal through resistor R30, and the base of the transistor Q4 is connected to the RLY OFF signal through resistor R31; The switch transistor Q1 and the switch transistor Q2 are arranged in parallel, the base of the switch transistor Q1 is connected to the emitter of the transistor Q3 through the resistor R27, the base of the switch transistor Q2 is connected to the emitter of the transistor Q4 through the resistor R26, and the emitters of the switch transistor Q1 and the switch transistor Q2 are both connected to the 12V VCC; The amplifying transistor Q6 and the amplifying transistor Q5 are arranged in parallel, the collector of the switching transistor Q2 is connected to the emitter of the amplifying transistor Q5, the collector of the switching transistor Q1 is connected to the emitter of the amplifying transistor Q6, and a TVS tube 7 is connected in series between the collector of the switching transistor Q1 and the emitter of the amplifying transistor Q5, the collector of the switching transistor Q2 is connected in series with the pin 1 of OUT1, and the collector of the switching transistor Q1 is connected in series with the pin 2 of OUT1; The bases of transistors Q3, Q4, Q6 and Q5 are connected in series with resistors and then connected to GND, and the collectors of Q6 and Q5 are directly connected to GND. The collectors of transistors Q3 and Q4 are connected in series with resistors R36 and R35 and then connected to GND. The relay control unit uses the principle of magnetic holding to effectively prevent the relay from being disconnected in the case of unstable voltage. TVS tube 7 is used for circuit protection and burn-in prevention.

2. A refrigerated container control circuit according to claim 1, characterized in that: It also includes an optical isolator U7, whose pin 1 is connected to the RLY ON signal, whose pin 2 is connected to GND through a resistor R53, and whose pin 3 is directly connected to GND; It also includes resistors R46 and R49 arranged in parallel, one end of both of which is connected to 3.3V VCC, and the other end is connected to pin 4 of the optical isolator U7. A light-emitting diode D16 is connected in series to the resistor R46. Pin 4 of the optical isolator U7 is also connected to the PINTON signal through the resistor R51, and the PINT ON signal is connected to pin 41 of the controller.

3. A refrigerated container control circuit according to claim 1, characterized in that: It also includes an optical isolator U8, whose pin 1 is connected to the RLY OFF signal, whose pin 2 is connected to GND through a resistor R54, and whose pin 3 is directly connected to GND; It also includes resistors R50 and R47 arranged in parallel, one end of both of which is connected to 3.3V VCC, and the other end is connected to pin 4 of the optical isolator U8. A light-emitting diode D17 is connected in series to the resistor R47. Pin 4 of the optical isolator U8 is also connected to the PINTOFF signal through the resistor R51, and the PINT OFF signal is connected to pin 42 of the controller.

4. A refrigerated container control circuit according to claim 1, characterized in that: It also includes an optical coupler U4, whose pin 1 is connected to the 12V VCC through a resistor R32, whose pin 2 is connected to the CloseState LED signal, and whose pin 2 is also connected to the pin 1 of P4, and the pin 2 of P4 is connected to GND; It also includes resistors R28 and R29 arranged in parallel, one end of both of which is connected to 3.3V VCC, and the other end is connected to pin 4 of the optocoupler U4, and a light-emitting diode D12 is connected in series to the resistor R28, and pin 4 of the optocoupler U4 is also connected to the Closed State signal through a resistor R33, and pin 3 of the optocoupler U4 is connected to GND, and the Closed State signal is connected to pin 73 of the controller.

5. A refrigerated container control circuit according to claim 1, characterized in that: It also includes an optical coupler U5, whose pin 2 is connected to the pin 2 of P5, the pin 1 of the optical coupler U5 is connected to the 12V VCC through the resistor R42 and the pin 3 of P5, and the pin 1 of P5 is connected to GND; It also includes resistors R38 and R40 arranged in parallel, one end of both of which is connected to 3.3V VCC, and the other end is connected to pin 4 of the optocoupler U5, and a light-emitting diode D13 is connected in series to the resistor R38, and pin 4 of the optocoupler U5 is also connected to a power status signal through a resistor R43, and pin 3 of the optocoupler U5 is connected to GND, and the power status signal is connected to pin 31 of the controller.

6. A refrigerated container control circuit according to claim 1, characterized in that: It also includes a switch SW1 and a switch SW2, wherein pins 1 of the two are connected, pins 2 of the switch SW1 and 2 of the switch SW2 are both connected to 3.3V VCC, pin 3 of the switch SW1 is connected to a KEY ON signal, and pin 3 of the switch SW2 is connected to a KEY OFF signal; The 12V VCC is connected to the CloseState LED signal through a lighted push button switch, the 5V VCC is connected to pin 3 of transistor Q7 through a lighted push button switch, the RUN EN signal is connected to pin 1 of transistor Q7 after being connected in series with resistor R39, and the RUNEN signal after being connected in series with resistor R39 is connected to GND through resistor R41, pin 2 of transistor Q7 is also connected to GND, and the RUN EN signal is connected to pin 58 of the controller.

7. A refrigerated container control circuit according to claim 1, characterized in that: It also includes a relay U6, whose pin 2 is connected to the KEY ON signal, whose pin 3 is connected to the RLY ON signal, whose pin 4 is connected to the OUT ON signal, whose pin 5 is connected to the OUT OFF signal, whose pin 6 is connected to the RLY OFF signal, and whose pin 7 is connected to the KEY OFF signal, and the OUT OFF signal and the OUT ON signal are respectively connected to the 57th pin and the 54th pin of the controller; Relay U6 and diode D15 are arranged in parallel, one end of both is connected to 5V VCC, and the other end and the 5V VCC after the series resistor R44 and the light-emitting diode D14 are connected to pin 3 of transistor Q8, pin 1 of transistor Q8 is connected to OUT EN signal through resistor R48, and pin 2 of transistor Q8 is connected to GND, the OUT EN signal after the series resistor R48 is connected to GND through resistor R45, and the OUT EN signal is connected to pin 43 of the controller.

8. A refrigerated container control circuit according to claim 1, characterized in that: It also comprises a power supply unit consisting of a fixed cylinder (1) and an annular flap plate (6) which are hinged to each other, wherein a socket (2) is arranged in a downwardly inclined manner in the fixed cylinder (1), a plug-in terminal (5) is arranged in the annular flap plate (6), and a reset member (9) and a locking member (10) are arranged at the hinge, the front side of the plug-in terminal (5) is used for plugging in a refrigeration plug, and the back side is used for plugging in the socket (2).

9. A refrigerated container control circuit according to claim 8, characterized in that: A photoelectric switch (4) for detecting whether the plug-in terminal (5) is plugged in place is vertically arranged at the bottom of the fixed cylinder (1) through an extension plate (3), and an open groove (601) for avoiding the photoelectric switch (4) is opened on the bottom plate of the annular flip plate (6); A rubber expansion sleeve for sealing is provided at the matching gap (7) between the fixed cylinder (1) and the annular flap (6), and an observation window (101) for visually checking whether the plug-in terminal (5) is plugged in place is also provided on the fixed cylinder (1).

10. A refrigerated container control circuit according to claim 9, characterized in that: The locking member (10) comprises a mounting tube (1001) sleeved on the outside of the rotating shaft (8); an angle sensor (11) for detecting the rotation angle of the rotating shaft (8) is provided at the end of the mounting tube (1001); and a limiting protrusion (801) is provided on the portion of the rotating shaft (8) located inside the mounting tube (1001); The installation tube (1001) is integrated with a telescopic member (1002), and an output end thereof is provided with a limit block (1003) that can be laterally inserted into the installation tube (1001), and the limit block (1003) can be inserted into the installation tube (1001) to lock the limit protrusion (801).

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