Refrigerator control system and vehicle-mounted refrigerator
By using a single wire load combined with a switch module and a detection module in the vehicle refrigerator, defrosting, heating, and anti-pinch/anti-collision functions are achieved, solving the problem of requiring multiple load controls in existing technologies, simplifying the manufacturing process, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-03-10
AI Technical Summary
The defrosting, heating, and anti-pinch/anti-collision functions of existing vehicle refrigerators need to be controlled separately by different loads, which is complex and costly to manufacture.
A metal wire load is used in conjunction with a switching module and a detection module. Defrosting, heating, and anti-pinch/anti-collision functions are achieved through control signals and pulse width modulation signals. Human contact is identified by changes in the impedance and capacitance of the metal wire, simplifying the manufacturing process and reducing costs.
Defrosting, heating, and anti-pinch/anti-collision functions are achieved through a single wire load, simplifying the manufacturing process and reducing costs.
Smart Images
Figure CN223985466U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of refrigerator control technology, and in particular to a refrigerator control system and a vehicle-mounted refrigerator. Background Technology
[0002] Car refrigerators, with their portable design and efficient refrigeration technology, provide drivers and passengers with a mobile refrigerated / temperature-controlled space.
[0003] Car refrigerators have multiple functions. For example, they can defrost by heating the interior environment with heating wires on the door frame; they can also heat the drawers by wrapping a heating film around them and then heating the drawers with electricity to accommodate different food preservation needs; and when a part of a person (such as a finger) is caught in the refrigerator door, the motor that drives the door is stalled, the motor current increases, and the control module detects the current to identify that an object is caught, thus cutting off the motor and achieving anti-pinch and anti-collision functions.
[0004] However, the aforementioned functions need to be controlled separately by different loads, which makes the manufacturing process complex and costly. Utility Model Content
[0005] This application provides a refrigerator control system and a vehicle-mounted refrigerator, which can realize multiple functions based on a single load, thereby simplifying the manufacturing process and reducing costs.
[0006] In a first aspect, embodiments of this application provide a refrigerator control system, including: a first switch module, a second switch module, a third switch module, a detection module, and a control module; the first switch module is connected between a first terminal of a first power supply and a first terminal of a metal wire in the refrigerator; the second switch module is connected between a second terminal of the first power supply and the third switch module; the third switch module is connected to a second terminal of the metal wire; the detection module is connected between the first and second terminals of the metal wire; the control module is connected to the first switch module, the second switch module, and the third switch module respectively; the control module is used to output a first control signal, a second control signal, and a first pulse width modulation signal; the first switch module is used to turn on or off in response to the first control signal; the second switch module... The first switch module is used to turn on or off in response to the second control signal; the third switch module is used to alternately turn on and off in response to the first pulse width modulation signal, wherein the metal wire heats up when the first switch module and the second switch module are on, and the temperature of the heated metal wire is determined based on the duty cycle of the first pulse width modulation signal; the metal wire stops heating up when the first switch module and / or the second switch module are off; the detection module is used to detect the impedance of the metal wire, and outputs a detection signal to the control module based on the capacitance value of the metal wire when the impedance of the metal wire is less than or equal to a preset impedance, so that the control module determines the capacitance value of the metal wire based on the detection signal, wherein the impedance of the metal wire is less than or equal to the preset impedance when the temperature of the metal wire is less than or equal to the preset temperature.
[0007] In one or more embodiments, the refrigerator control system further includes a fourth switch module, a fifth switch module, a sixth switch module, and a drive module; the control module is further configured to output one of a third control signal and a fourth control signal; the fourth switch module is connected to the second power supply, the control module, the fifth switch module, and the drive module respectively, and is configured to turn on in response to the third control signal to establish a connection between the second power supply and the fifth switch module and the drive module, and is also configured to turn off in response to the fourth control signal to disconnect the connection between the second power supply and the fifth switch module and the drive module; the fifth switch module is connected between the control module and the drive module, and is configured to alternately turn on and off in response to the first pulse width modulation signal, and in connection with the second power supply... When the source is connected, a second pulse width modulation signal is output based on the second power supply, wherein the second pulse width modulation signal and the first pulse width modulation signal are complementary signals; the driving module is connected to the sixth switching module, and the driving module is used to output a third pulse width modulation signal based on the second pulse width modulation signal, wherein the third pulse width modulation signal has the same duty cycle as the second pulse width modulation signal, and the driving capability of the third pulse width modulation signal is stronger than that of the second pulse width modulation signal; the sixth switching module is connected to the third switching module, and the sixth switching module is used to alternately turn on and off in response to the third pulse width modulation signal, and output a fourth pulse width modulation signal to the third switching module, so that the third switching module alternately turns on and off in response to the fourth pulse width modulation signal, wherein the fourth pulse width modulation signal has the same duty cycle as the third pulse width modulation signal.
[0008] In one or more embodiments, the first switching module includes a first switching transistor; a first end of the first switching transistor is connected to the control module, a second end of the first switching transistor is connected to a first end of the metal wire, and a third end of the first switching transistor is connected to a first end of the first power supply.
[0009] In one or more embodiments, the second switching module includes a second switching transistor; a first end of the second switching transistor is connected to the control module, a second end of the second switching transistor is connected to a second end of the first power supply, and a third end of the second switching transistor is connected to the third switching module.
[0010] In one or more embodiments, the third switch module includes a third switch tube; a first end of the third switch tube is connected to the control module, a second end of the third switch tube is connected to the second end of the metal wire, and a third end of the third switch tube is connected to the second switch module.
[0011] In one or more embodiments, the fourth switching module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fourth switching transistor, and a fifth switching transistor; a first terminal of the first resistor is connected to the control module; a second terminal of the first resistor is connected to the first terminal of the second resistor and the first terminal of the third resistor; a second terminal of the second resistor is connected to the third terminal of the fourth switching transistor; a first terminal of the fourth switching transistor is connected to the control module; a second terminal of the fourth switching transistor is grounded; a second terminal of the third resistor is connected to the first terminal of the fifth switching transistor and the first terminal of the fourth resistor; a second terminal of the fifth switching transistor is connected to the second terminal of the fourth resistor and the second power supply; and a third terminal of the fifth switching transistor is connected to the fifth switching module and the driving module.
[0012] In one or more embodiments, the fifth switching module includes a fifth resistor, a sixth resistor, a seventh resistor, and a sixth switching transistor; the fifth resistor and the sixth resistor are connected in series between the control module and ground; the connection point between the fifth resistor and the sixth resistor is connected to the first terminal of the sixth switching transistor; the second terminal of the sixth switching transistor is grounded; the third terminal of the sixth switching transistor is connected to the drive module and the first terminal of the seventh resistor; and the second terminal of the seventh resistor is connected to the drive module and the fourth switching module.
[0013] In one or more embodiments, the driving module includes a first capacitor, a second capacitor, a first diode, and a driving chip; the first terminal of the first capacitor is connected to the anode of the first diode, the fourth switching module, the fifth switching module, and the first power supply pin of the driving chip, respectively; the input pin of the driving chip is connected to the fifth switching module; the common pin of the driving chip and the second terminal of the first capacitor are both grounded; the second power supply pin of the driving chip is connected to the cathode of the first diode and the first terminal of the second capacitor, respectively; the second terminal of the second capacitor is connected to the third power supply pin of the driving chip and the sixth switching module; and the output pin of the driving chip is connected to the sixth switching module.
[0014] In one or more embodiments, the sixth switching module includes an eighth resistor, a ninth resistor, a tenth resistor, a second diode, a Zener diode, a seventh switching transistor, and a third capacitor; the first end of the eighth resistor is connected to the driving module, the second end of the eighth resistor is connected to the first end of the ninth resistor, the cathode of the Zener diode, and the first end of the seventh switching transistor, the second end of the ninth resistor is connected to the anode of the Zener diode, the second end of the seventh switching transistor, the second end of the third capacitor, and the third switching module, the third end of the seventh switching transistor is connected to the second power supply, the first end of the tenth resistor, and the anode of the second diode, and the second end of the tenth resistor is connected to the first end of the third capacitor and the cathode of the second diode.
[0015] Secondly, embodiments of this application provide a vehicle refrigerator, including a drawer, a cabinet, a metal wire, and a refrigerator control system as described above; the metal wire covers the drawer, and / or the metal wire covers the cabinet.
[0016] The beneficial effects of this application are as follows: The refrigerator control system of this application embodiment includes a first switch module, a second switch module, a third switch module, a detection module, and a control module. The first switch module is connected between a first terminal of a first power supply and a first terminal of a metal wire in the refrigerator. The second switch module is connected between a second terminal of the first power supply and the third switch module. The third switch module is connected to a second terminal of the metal wire. The detection module is connected between the first and second terminals of the metal wire. The control module is connected to the first, second, and third switch modules respectively. Specifically, the control module outputs a first control signal, a second control signal, and a first pulse width modulation signal. The first switch module is used to turn on or off in response to the first control signal. The second switch module is used to turn on or off in response to the second control signal. The third switch module is used to alternately turn on and off in response to the first pulse width modulation signal. When the first and second switch modules are on, the metal wire heats up, and the temperature of the heated metal wire is determined based on the duty cycle of the first pulse width modulation signal. When the first and / or second switch modules are off, the metal wire stops heating. The detection module detects the impedance of the metal wire and outputs a detection signal to the control module based on the wire's capacitance when the wire's impedance is less than or equal to a preset impedance. The control module then determines the wire's capacitance based on this signal. Specifically, the wire's impedance is less than or equal to the preset impedance when the wire's temperature is less than or equal to the preset temperature. In this way, the metal wire enables both defrosting and heating functions. Furthermore, if a person comes into contact with the wire when it stops heating, the wire's capacitance changes. The control module, after determining the capacitance based on the detection signal, can then confirm contact with the wire, thus enabling anti-pinch and anti-collision functions. Therefore, this process achieves defrosting, heating, and anti-pinch / anti-collision functions using only the metal wire as a load. Compared to related technologies that require controlling multiple functions through different loads, this simplifies the manufacturing process and reduces costs. Attached Figure Description
[0017] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are not intended to limit the embodiments, and elements having the same reference numerals in the drawings are designated as similar elements.
[0018] Figure 1 This is a structural diagram of a vehicle-mounted refrigerator in related technologies;
[0019] Figure 2 This is a schematic diagram of the mechanical structure of the vehicle-mounted refrigerator provided in the embodiments of this application. Figure 1 ;
[0020] Figure 3 This is a schematic diagram of the mechanical structure of the vehicle-mounted refrigerator provided in the embodiments of this application. Figure 2 ;
[0021] Figure 4 This is a schematic diagram of the composition of the refrigerator control system provided in the embodiments of this application. Figure 1 ;
[0022] Figure 5 This is a schematic diagram of the composition of the refrigerator control system provided in the embodiments of this application. Figure 2 ;
[0023] Figure 6 This is a schematic diagram of the circuit structure of the refrigerator control system provided in an embodiment of this application. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and thoroughly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0025] It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements between them.
[0026] Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.
[0027] Please refer to Figure 1 , Figure 1 This is a structural diagram of a vehicle-mounted refrigerator in related technologies. For example... Figure 1 As shown, the vehicle-mounted refrigerator includes a refrigerator drawer A1, a refrigerator defrosting heating wire A2, a refrigerator body A3, and a refrigerator heating film A4. This vehicle-mounted refrigerator has multiple functions. For example, the refrigerator defrosting heating wire A2, arranged on the refrigerator door frame, heats the internal environment of the refrigerator to achieve the defrosting function; a refrigerator heating film A4 is wrapped around the outside of the refrigerator drawer A1, and the film is powered on externally to achieve the heating function, suitable for food preservation according to different needs; specifically, when a part of a person (such as a finger) is trapped by the refrigerator door, the motor driving the refrigerator door is stalled, the motor current increases, and the control module detects the current magnitude to identify the trapped object, thereby cutting off the motor movement to achieve anti-pinch and anti-collision functions.
[0028] However, the above-mentioned functions need to be controlled by different loads (the defrosting function is controlled by the refrigerator heating wire A2, the heating function is controlled by the refrigerator heating film A4, and the anti-pinch and anti-collision function is controlled by the motor in the refrigerator), which makes the manufacturing process complex and costly.
[0029] Based on this, the present application provides a vehicle refrigerator that can realize multiple functions based on a single load. Compared with the related technologies that require controlling multiple functions separately through different loads, this simplifies the manufacturing process and reduces costs.
[0030] Please refer to the above as well. Figures 2-4 , Figure 2 and Figure 3 The following are schematic diagrams illustrating two different mechanical structures within the vehicle-mounted refrigerator 1000. Figure 4 An exemplary circuit diagram of a vehicle refrigerator 1000 is shown.
[0031] like Figure 2 and Figure 3 As shown, the vehicle refrigerator 1000 includes a refrigerator control system 100, a wire 200, a drawer 300, and a cabinet 400 as described in any embodiment of this application.
[0032] In some implementation methods, such as Figure 2 As shown, the metal wire 200 covers the drawer 300. In other embodiments, such as Figure 3 As shown, the metal wire 200 covers the box body 400. In some embodiments, the metal wire 200 covers both the drawer 300 and the box body 400.
[0033] In some embodiments, the vehicle refrigerator 1000 also includes a motor (not shown), which is connected to the drawer 300. When the motor is running, it drives the drawer 300 to open or close the refrigerator door. Since the motor operates automatically, it may cause a person to be trapped or bumped. When a part of the body (e.g., a finger) touches the refrigerator door, that part simultaneously comes into contact with the wire 200, causing a change in the capacitance of the wire 200. This change can be used to identify whether a person is trapped in the refrigerator door; the specific identification process will be explained later. Afterward, the motor is stopped, achieving the anti-pinch and anti-collision function, i.e., preventing a person from being trapped or bumped.
[0034] like Figure 4 As shown, the refrigerator control system 100 includes a first switch module 10, a second switch module 20, a third switch module 30, a detection module 40, and a control module 50.
[0035] The first switch module 10 is connected between the first end of the first power supply VC1 and the first end of the metal wire 200 in the refrigerator. The second switch module 20 is connected between the second end of the first power supply VC1 and the third switch module 30. The third switch module 30 is connected to the second end of the metal wire 200. The detection module 40 is connected between the first end and the second end of the metal wire 200. The control module 50 is connected to the first switch module 10, the second switch module 20 and the third switch module 30 respectively.
[0036] Specifically, the control module 50 outputs a first control signal, a second control signal, and a first pulse width modulation signal. The first switch module 10 is turned on or off in response to the first control signal. The second switch module 20 is turned on or off in response to the second control signal. The third switch module 30 is alternately turned on and off in response to the first pulse width modulation signal. When the first switch module 10 and the second switch module 20 are on, the metal wire 200 heats up (to achieve defrosting or heating functions), and the temperature of the heated metal wire 200 is determined based on the duty cycle of the first pulse width modulation signal. When the first switch module 10 and / or the second switch module 20 are off, the metal wire 200 stops heating. The detection module 40 detects the impedance of the metal wire 200 and outputs a detection signal to the control module 50 based on the capacitance value of the metal wire 200 when the impedance of the metal wire 200 is less than a preset impedance, so that the control module 50 determines the capacitance value of the metal wire 200 based on the detection signal. Specifically, when the temperature of the metal wire 200 is less than a preset temperature, the impedance of the metal wire 200 is less than the preset impedance. It is understandable that, during heating, the resistivity of the metal wire 200 increases and the impedance of the metal wire increases due to thermal expansion. Therefore, when the temperature of the metal wire 200 is lower than the preset temperature, it can be considered that the metal wire 200 is not used for heating, and the impedance of the metal wire 200 is lower than the preset impedance. At this time, the metal wire 200 is used to achieve the anti-pinch and anti-collision function. In some embodiments, when the temperature of the metal wire 200 is room temperature (i.e., the temperature of the environment in which the metal wire 200 is located), that is, before the metal wire 200 is heated, the initial impedance of the metal wire 200 is R0. In this case, the preset temperature can be configured as room temperature, and the preset impedance can be set to R0.
[0037] In summary, on the one hand, when the first switch module 10 and the second switch module 20 are turned on, the first power supply VC1 and the metal wire 200 form a circuit, and the first power supply VC1 supplies power to the metal wire 200. In this case, the metal wire 200 heats up to achieve a defrosting or heating function. Furthermore, the temperature of the metal wire 200 can be adjusted by regulating the duty cycle of the first pulse width modulation signal. On the other hand, when at least one of the first switch module 10 and the second switch module 20 is turned off, the circuit formed by the first power supply VC1 and the metal wire 200 is broken, the first power supply VC1 no longer supplies power to the metal wire 200, the metal wire 200 stops heating, and the temperature of the metal wire 200 gradually decreases. When the detection module 40 detects that the temperature of the metal wire 200 decreases to the point that the impedance of the metal wire 200 is less than a preset impedance, the detection module 40 can then detect the capacitance of the metal wire 200. In this scenario, if a human body comes into contact with the metal wire 200, it will change the capacitance value of the metal wire 200. Subsequently, the control module 50 determines the capacitance value of the metal wire 200 based on the detection signal, thus determining whether a human body has come into contact with the metal wire 200. Based on this, the anti-pinch and anti-collision functions can be achieved. It is evident that in the above process, the defrosting function, heating function, and anti-pinch and anti-collision function are all achieved through a single load, metal wire 200. Compared to related technologies that require different loads to control multiple functions separately, this simplifies the manufacturing process and reduces costs.
[0038] In some embodiments, such as Figure 5 As shown, the refrigerator control system 100 also includes a fourth switch module 50, a fifth switch module 60, a sixth switch module 80, and a drive module 70. The fourth switch module 50 is connected to the second power supply VC2, the control module 50, the fifth switch module 60, and the drive module 70. The fifth switch module 60 is connected between the control module 50 and the drive module 70. The drive module 70 is connected to the sixth switch module 80, and the sixth switch module 80 is connected to the third switch module 30.
[0039] Specifically, the control module 50 is also used to output one of the third control signal and the fourth control signal. The fourth switch module 50 is used to turn on in response to the third control signal to establish a connection between the second power supply VC2 and the fifth switch module 60 and the drive module 70. The fourth switch module 50 is also used to turn off in response to the fourth control signal to disconnect the connection between the second power supply VC2 and the fifth switch module 60 and the drive module 70. The fifth switch module 60 is used to alternately turn on and off in response to the first pulse width modulation signal, and when the fifth switch module 60 is connected to the second power supply VC2, it outputs a second pulse width modulation signal based on the second power supply VC2, wherein the second pulse width modulation signal and the first pulse width modulation signal are complementary signals. The drive module 70 is used to output a third pulse width modulation signal based on the second pulse width modulation signal, wherein the third pulse width modulation signal has the same duty cycle as the second pulse width modulation signal, and the driving capability of the third pulse width modulation signal is stronger than that of the second pulse width modulation signal. The sixth switch module 80 is used to alternately turn on and off in response to the third pulse width modulation signal, and outputs the fourth pulse width modulation signal to the third switch module 30 so that the third switch module 30 alternately turns on and off in response to the fourth pulse width modulation signal, wherein the duty cycle of the fourth pulse width modulation signal is the same as that of the third pulse width modulation signal.
[0040] In this embodiment, when the control module 50 outputs the third control signal, the fourth switch module 50 is turned on. The second power supply VC2 is connected to the fifth switch module 60 and the drive module 70, and the second power supply VC2 supplies power to the fifth switch module 60 and the drive module 70. In this case, the fifth switch module 60 can output a second pulse width modulation signal that is complementary to the first pulse width modulation signal, and the high level of the first pulse width modulation signal corresponds to the voltage of the first power supply VC1, and the high level of the second pulse width modulation signal corresponds to the voltage of the second power supply VC2. At the same time, the drive module 70 can output a third pulse width modulation signal with the same duty cycle as the second pulse width modulation signal, and the driving capability of the third pulse width modulation signal is stronger than that of the second pulse width modulation signal. Then, the sixth switch module 80 outputs a fourth pulse width modulation signal with the same duty cycle as the third pulse width modulation signal. It can be seen that the fourth pulse width modulation signal and the first pulse width modulation signal are complementary signals. The high level of the fourth pulse width modulation signal corresponds to the voltage of the second power supply VC2. The driving capability of the fourth pulse width modulation signal is stronger than that of the first pulse width modulation signal. Therefore, the third switch module 30 can be reliably and stably turned on or off based on the fourth pulse width modulation signal.
[0041] When control module 50 outputs the fourth control signal, fourth switch module 50 is turned off, and the connection between second power supply VC2 and fifth switch module 60 and drive module 70 is disconnected. Second power supply VC2 stops supplying power to fifth switch module 60 and drive module 70. In this case, fifth switch module 60 stops outputting second pulse width modulation signal, drive module 70 stops outputting third pulse width modulation signal, sixth switch module 80 stops outputting fourth pulse width modulation signal, and third switch module 30 remains off to ensure that the connection between first power supply VC1 and metal wire 200 is disconnected.
[0042] Please refer to Figure 6 , Figure 6 This is a schematic diagram of the circuit structure of a refrigerator control system 100 provided in an embodiment of this application. Figure 6 As shown, the first switching module 10 includes a first switching transistor Q1.
[0043] The first end of the first switch transistor Q1 is connected to the control module 50, the second end of the first switch transistor Q1 is connected to the first end of the metal wire 200, and the third end of the first switch transistor Q1 is connected to the first end of the first power supply VC1.
[0044] Specifically, when the first control signal is high, the first switch Q1 is turned on; when the first control signal is low, the first switch Q1 is turned off.
[0045] In this embodiment, the first switch Q1 is an NMOS transistor. The gate of the NMOS transistor is the first terminal of the first switch Q1, the source of the NMOS transistor is the second terminal of the first switch Q1, and the drain of the NMOS transistor is the third terminal of the first switch Q1.
[0046] In addition, the first switch Q1 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.
[0047] In some embodiments, the second switching module 20 includes a second switching transistor Q2.
[0048] The first end of the second switch Q2 is connected to the control module 50, the second end of the second switch Q2 is connected to the second end of the first power supply VC1, and the third end of the second switch Q2 is connected to the third switch module 30.
[0049] Specifically, when the second control signal is high, the second switch Q2 is turned on; when the second control signal is low, the second switch Q2 is turned off.
[0050] In this embodiment, the second switch Q2 is an NMOS transistor. The gate of the NMOS transistor is the first terminal of the second switch Q2, the source of the NMOS transistor is the second terminal of the second switch Q2, and the drain of the NMOS transistor is the third terminal of the second switch Q2.
[0051] In addition, the second switch Q2 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.
[0052] In some embodiments, the third switching module 30 includes a third switching transistor Q3.
[0053] The first end of the third switch Q3 is connected to the control module 50, the second end of the third switch Q3 is connected to the second end of the metal wire 200, and the third end of the third switch Q3 is connected to the second switch module 20.
[0054] Specifically, when the fourth pulse width modulation signal is at a high level, the third switch Q3 is turned on; when the fourth pulse width modulation signal is at a low level, the third switch Q3 is turned off. Thus, in response to the fourth pulse width modulation signal, the third switch Q3 alternately turns on and off.
[0055] In this embodiment, the third switch Q3 is an NMOS transistor. The gate of the NMOS transistor is the first terminal of the third switch Q3, the source of the NMOS transistor is the second terminal of the third switch Q3, and the drain of the NMOS transistor is the third terminal of the third switch Q3.
[0056] In addition, the third switch Q3 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.
[0057] In some embodiments, the fourth switching module 50 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fourth switching transistor Q4, and a fifth switching transistor Q5.
[0058] In this configuration, the first end of the first resistor R1 is connected to the control module 50, the second end of the first resistor R1 is connected to the first ends of the second resistor R2 and the third resistor R3, the second end of the second resistor R2 is connected to the third end of the fourth switch Q4, the first end of the fourth switch Q4 is connected to the control module 50, the second end of the fourth switch Q4 is grounded to GND, the second end of the third resistor R3 is connected to the first end of the fifth switch Q5 and the first end of the fourth resistor R4, the second end of the fifth switch Q5 is connected to the second end of the fourth resistor R4 and the second power supply VC2, and the third end of the fifth switch Q5 is connected to the fifth switch module 60 and the drive module 70.
[0059] Specifically, when the control module 50 outputs only the third control signal (a high-level signal in this embodiment), the third control signal is input to the fifth switch Q5 through the first resistor R1 and the third resistor R3. The fifth switch Q5 is turned on, and the second power supply VC2 is connected to the fifth switch module 60 and the drive module 70 through the fifth switch Q5.
[0060] When the control module 50 outputs only the fourth control signal (a high-level signal in this embodiment), the fourth control signal is input to the fourth switch Q4, causing the fourth switch Q4 to conduct. Subsequently, the base of the fifth switch Q5 is grounded to GND through the third resistor R3 and the second resistor R2, the fifth switch Q5 is turned off, and the connection between the second power supply VC2 and the fifth switch module 60 and the drive module 70 is disconnected.
[0061] In this embodiment, the fourth switch Q4 is an NPN transistor and the fifth switch Q5 is a PNP transistor. The base of the NPN transistor is the first terminal of the fourth switch Q4, the emitter of the NPN transistor is the second terminal of the fourth switch Q4, and the collector of the NPN transistor is the third terminal of the fourth switch Q4. Similarly, the base of the PNP transistor is the first terminal of the fifth switch Q5, the emitter of the PNP transistor is the second terminal of the fifth switch Q5, and the collector of the PNP transistor is the third terminal of the fifth switch Q5.
[0062] In addition, the fourth switch Q4 and the fifth switch Q5 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.
[0063] In some embodiments, the fifth switching module 60 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a sixth switching transistor Q6.
[0064] Among them, the fifth resistor R5 and the sixth resistor R6 are connected in series between the control module 50 and ground GND. The connection point between the fifth resistor R5 and the sixth resistor R6 is connected to the first terminal of the sixth switch Q6. The second terminal of the sixth switch Q6 is grounded to GND. The third terminal of the sixth switch Q6 is connected to the drive module 50 and the first terminal of the seventh resistor R7. The second terminal of the seventh resistor R7 is connected to the drive module 50 and the fourth switch module 50.
[0065] Specifically, the first pulse width modulation (PWM) signal is input to the base of the sixth switch Q6 through the fifth resistor R5, and the second PWM signal is output from the collector of the sixth switch Q6. When the fifth switch Q5 is turned on and the second power supply VC2 is connected to the fifth switch module 60 through the fifth switch Q5, if the first PWM signal is at a high level, the sixth switch Q6 is turned on, and the collector of the sixth switch Q6 is grounded to GND, corresponding to a low level output from the collector of the sixth switch Q6, that is, the second PWM signal is at a low level at this time; if the first PWM signal is at a low level, the sixth switch Q6 is turned off, and the voltage at the collector of the sixth switch Q6 is the voltage of the second power supply VC2, corresponding to a high level output from the collector of the sixth switch Q6, that is, the second PWM signal is at a high level at this time. It can be seen that when the first PWM signal is at a high level, the second PWM signal is at a low level; when the first PWM signal is at a low level, the second PWM signal is at a high level, then the first PWM signal and the second PWM signal are complementary signals.
[0066] In this embodiment, the sixth switch Q6 is an NPN transistor. The base of the NPN transistor is the first terminal of the sixth switch Q6, the emitter of the NPN transistor is the second terminal of the sixth switch Q6, and the collector of the NPN transistor is the third terminal of the sixth switch Q6.
[0067] In addition, the sixth switch Q6 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.
[0068] In some embodiments, the driving module 70 includes a first capacitor C1, a second capacitor C2, a first diode D1, and a driving chip U1.
[0069] The first terminal of the first capacitor C1 is connected to the anode of the first diode D1, the fourth switch module 50, the fifth switch module 60, and the first power supply pin (VCC pin) of the driver chip U1. The input pin (IN pin) of the driver chip U1 is connected to the fifth switch module 60. The common pin (COM pin) of the driver chip U1 and the second terminal of the first capacitor C1 are grounded to GND. The second power supply pin (VB pin) of the driver chip U1 is connected to the cathode of the first diode D1 and the first terminal of the second capacitor C2. The second terminal of the second capacitor C2 is connected to the third power supply pin (VS pin) of the driver chip U1 and the sixth switch module 80. The output pin (HO pin) of the driver chip U1 is connected to the sixth switch module 80.
[0070] In this embodiment, the driver chip U1 is an integrated circuit used to drive the MOS transistor (metal-oxide-semiconductor field-effect transistor). The driver chip U1 can provide sufficient current to quickly turn the MOS transistor on and off. That is, the driver chip U1 can output a third pulse width modulation signal with a stronger driving capability than the second pulse width modulation signal to quickly turn the MOS transistor on and off, thereby improving efficiency and reducing switching losses.
[0071] When the fifth switch Q5 is turned on, and the second power supply VC2 is connected to the fifth switch module 60 through the fifth switch Q5, the second power supply VC2 is input to the first power supply pin of the driver chip U1 through the fifth switch Q5 to power the driver chip U1, and the driver chip U1 can output the third pulse width modulation signal normally. When the fifth switch Q5 is turned off, the connection between the second power supply VC2 and the first power supply pin of the driver chip U1 is broken, the driver chip U1 loses power, and the driver chip U1 stops outputting the third pulse width modulation signal.
[0072] In some embodiments, the sixth switch module 80 includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second diode D2, a Zener diode Z1, a seventh switch Q7, and a third capacitor C3.
[0073] Among them, the first end of the eighth resistor R8 is connected to the drive module 50, the second end of the eighth resistor R8 is connected to the first end of the ninth resistor R9, the cathode of the Zener diode Z1 and the first end of the seventh switch Q7, the second end of the ninth resistor R9 is connected to the anode of the Zener diode Z1, the second end of the seventh switch Q7, the second end of the third capacitor C3 and the third switch module 30, the third end of the seventh switch Q7 is connected to the second power supply VC2, the first end of the tenth resistor R10 and the anode of the second diode D2, and the second end of the tenth resistor R10 is connected to the first end of the third capacitor C3 and the cathode of the second diode D2.
[0074] Specifically, when the third pulse width modulation signal is high, the seventh switch Q7 is turned on, and the second power supply VC2 is input to the gate of the third switch Q3 through the seventh switch Q7, corresponding to a high level for the fourth pulse width modulation signal. When the third pulse width modulation signal is low, the seventh switch Q7 is turned off, and the connection between the second power supply VC2 and the gate of the third switch Q3 is broken, corresponding to a low level for the fourth pulse width modulation signal. Therefore, the duty cycle of the fourth pulse width modulation signal is the same as that of the third pulse width modulation signal.
[0075] for Figure 6 In the circuit structure shown, when the first switch Q1 and the second switch Q2 are turned on, the first power supply VC1 forms a circuit with the metal wire 200, and the first power supply VC1 supplies power to the metal wire 200. In this case, the metal wire 200 heats up to achieve a defrosting or heating function. Furthermore, the temperature of the metal wire 200 can be adjusted by regulating the duty cycle of the first pulse width modulation signal, thereby regulating the duty cycles of the second, third, and fourth pulse width modulation signals.
[0076] When at least one of the first switching transistors Q1 and Q2 is turned off, the circuit formed by the first power supply VC1 and the metal wire 200 is broken. The first power supply VC1 no longer supplies power to the metal wire 200, the metal wire 200 stops heating, and its temperature gradually decreases. When the detection module 40 detects that the temperature of the metal wire 200 has decreased to the point that its impedance is less than a preset impedance, the detection module 40 can detect the capacitance of the metal wire 200. In this case, if a human body comes into contact with the metal wire 200, it will change the capacitance of the metal wire 200. Subsequently, after the control module 50 determines the capacitance of the metal wire 200 based on the detection signal, it can determine whether a human body has come into contact with the metal wire 200, thereby realizing the anti-pinch and anti-collision function.
[0077] As can be seen, in the above process, the defrosting function, heating function and anti-pinch and anti-collision function are realized by a single load of metal wire 200. Compared with the related technology, which requires different loads to control multiple functions separately, this can simplify the manufacturing process and reduce costs.
[0078] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
[0079] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A refrigerator control system, characterized by, The refrigerator control system comprises a first switch module, a second switch module, a third switch module, a detection module and a control module. The first switch module is connected between a first end of a first power supply and a first end of a metal wire in the refrigerator, the second switch module is connected between a second end of the first power supply and the third switch module, the third switch module is connected with a second end of the metal wire, the detection module is connected between the first end and the second end of the metal wire, and the control module is connected with the first switch module, the second switch module and the third switch module respectively. The control module is configured to output a first control signal, a second control signal and a first pulse width modulation signal. The first switch module is configured to be turned on or turned off in response to the first control signal. The second switch module is configured to be turned on or turned off in response to the second control signal. The third switch module is configured to be alternately turned on and turned off in response to the first pulse width modulation signal, wherein the metal wire generates heat when the first switch module and the second switch module are turned on, and the temperature of the heat generated by the metal wire is determined based on the duty cycle of the first pulse width modulation signal, and the metal wire stops generating heat when the first switch module and / or the second switch module is turned off. The detection module is configured to detect the impedance of the metal wire, and output a detection signal to the control module based on the capacitance of the metal wire when the impedance of the metal wire is less than or equal to a preset impedance, so that the control module determines the capacitance of the metal wire based on the detection signal, wherein the impedance of the metal wire is less than or equal to the preset impedance when the temperature of the metal wire is less than or equal to a preset temperature. The refrigerator control system further comprises a fourth switch module, a fifth switch module, a sixth switch module and a driving module.
2. The refrigerator control system of claim 1, wherein, The control module is further configured to output one of a third control signal and a fourth control signal. The fourth switch module is connected with a second power supply, the control module, the fifth switch module and the driving module respectively, and is configured to be turned on in response to the third control signal to establish a connection between the second power supply and the fifth switch module and the driving module, and is further configured to be turned off in response to the fourth control signal to disconnect the connection between the second power supply and the fifth switch module and the driving module. The fifth switch module is connected between the control module and the driving module, and is configured to be alternately turned on and turned off in response to the first pulse width modulation signal, and output a second pulse width modulation signal based on the second power supply when it is connected with the second power supply, wherein the second pulse width modulation signal and the first pulse width modulation signal are complementary signals. The driving module is connected with the sixth switch module, and is configured to output a third pulse width modulation signal based on the second pulse width modulation signal, wherein the duty cycle of the third pulse width modulation signal is the same as that of the second pulse width modulation signal, and the driving capability of the third pulse width modulation signal is stronger than that of the second pulse width modulation signal. The sixth switch module is connected with the third switch module, and the sixth switch module is used for alternating on and off in response to the third pulse width modulation signal and outputting a fourth pulse width modulation signal to the third switch module, so that the third switch module alternates on and off in response to the fourth pulse width modulation signal, wherein the duty cycle of the fourth pulse width modulation signal is the same as that of the third pulse width modulation signal.
3. The refrigerator control system of claim 1 or 2, wherein The first switch module comprises a first switch tube. The first end of the first switch tube is connected with the control module, the second end of the first switch tube is connected with the first end of the metal wire, and the third end of the first switch tube is connected with the first end of the first power supply.
4. The refrigerator control system of claim 1 or 2, wherein The second switch module comprises a second switch tube. The first end of the second switch tube is connected with the control module, the second end of the second switch tube is connected with the second end of the first power supply, and the third end of the second switch tube is connected with the third switch module. 5.The refrigerator control system of claim 1 or 2, wherein The third switch module comprises a third switch tube. The first end of the third switch tube is connected with the control module, the second end of the third switch tube is connected with the second end of the metal wire, and the third end of the third switch tube is connected with the second switch module. 6.The refrigerator control system of claim 2, wherein, The fourth switch module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fourth switch tube and a fifth switch tube. The first end of the first resistor is connected with the control module, the second end of the first resistor is connected with the first end of the second resistor and the first end of the third resistor respectively, the second end of the second resistor is connected with the third end of the fourth switch tube, the first end of the fourth switch tube is connected with the control module, the second end of the fourth switch tube is grounded, the second end of the third resistor is connected with the first end of the fifth switch tube and the first end of the fourth resistor respectively, the second end of the fifth switch tube is connected with the second end of the fourth resistor and the second power supply respectively, and the third end of the fifth switch tube is connected with the fifth switch module and the driving module respectively.
7. The refrigerator control system of claim 2, wherein, The fifth switch module comprises a fifth resistor, a sixth resistor, a seventh resistor and a sixth switch tube. The fifth resistor and the sixth resistor are connected in series between the control module and the ground, the connecting point between the fifth resistor and the sixth resistor is connected with the first end of the sixth switch tube, the second end of the sixth switch tube is grounded, and the third end of the sixth switch tube is connected with the driving module and the first end of the seventh resistor respectively, and the second end of the seventh resistor is connected with the driving module and the fourth switch module respectively. 8.The refrigerator control system of claim 2, wherein, The driving module comprises a first capacitor, a second capacitor, a first diode and a driving chip. The first end of the first capacitor is connected with the anode of the first diode, the fourth switch module, the fifth switch module and the first power pin of the driving chip respectively, the input pin of the driving chip is connected with the fifth switch module, the common pin of the driving chip and the second end of the first capacitor are grounded, the second power pin of the driving chip is connected with the cathode of the first diode and the first end of the second capacitor respectively, the second end of the second capacitor is connected with the third power pin of the driving chip and the sixth switch module, and the output pin of the driving chip is connected with the sixth switch module. 9.The refrigerator control system of claim 2, wherein, The sixth switch module comprises an eighth resistor, a ninth resistor, a tenth resistor, a second diode, a voltage stabilizing diode, a seventh switch tube and a third capacitor. The first end of the eighth resistor is connected with the driving module, the second end of the eighth resistor is connected with the first end of the ninth resistor, the cathode of the voltage stabilizing diode and the first end of the seventh switch tube respectively, the second end of the ninth resistor is connected with the anode of the voltage stabilizing diode, the second end of the seventh switch tube, the second end of the third capacitor and the third switch module respectively, the third end of the seventh switch tube is connected with the second power supply, the first end of the tenth resistor and the anode of the second diode respectively, and the second end of the tenth resistor is connected with the first end of the third capacitor and the cathode of the second diode.
10. A vehicle-mounted refrigerator characterized by comprising: The refrigerator control system comprises a drawer, a box body, a metal wire and the refrigerator control system according to any one of claims 1-9. The metal wire covers the drawer, and / or the metal wire covers the box body.