Vehicle-mounted refrigerator circuit and vehicle-mounted refrigerator

Abstract

The utility model relates to the technical field of vehicle-mounted refrigerators, and provides a vehicle-mounted refrigerator circuit and a vehicle-mounted refrigerator, and the vehicle-mounted refrigerator circuit comprises an input connection module which is used for being connected with a vehicle-mounted power supply; the input end of the boosting module is connected with the input connection module; the output end of the boosting module is connected with the defrosting driving module, and the defrosting driving module is used for being connected with a defrosting heater; and the output end of the boosting module is connected with the main control module, and the main control module is connected with the controlled end of the defrosting driving module. The output voltage is boosted to the preset voltage through boosting processing of the boosting module, the effect of adapting to different vehicle-mounted power supplies is achieved, meanwhile, the voltage is increased through boosting processing, the resistance requirement for the defrosting heater is reduced, the defrosting heater of a general household refrigerator model is facilitated, universality is improved, the output voltage of the boosting module is maintained at the preset voltage, and the practicability is high. The power of the defrosting heater is stable, fluctuation is avoided, and the frost stabilizing effect is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted refrigerators, in particular to a vehicle-mounted refrigerator circuit and a vehicle-mounted refrigerator. Background Art

[0002] The on-board air-cooled refrigerator can avoid frosting of the evaporator by installing a defrost heater, thereby improving the refrigeration effect. However, since the voltage of the on-board power supply varies with the power, the power of the defrost heater fluctuates, and there is a problem of too high surface temperature when the voltage is high, or a problem of poor defrosting effect when the voltage is low. At the same time, there are differences in the voltage ranges of different types of on-board power supplies, such as the 12V range or the 24V range. If the existing defrost heater is used in different voltage ranges, the working power of the defrost heater will also change accordingly, and there is a problem of the defrost heater being too powerful or too weak.

[0003] In the prior art, in order to solve the above problems, some car refrigerators have differentiated designs for the voltage ranges of different car power supplies, so that the defrost heaters can adapt to the corresponding voltage ranges. However, this method requires additional design and cannot be used with the defrost heaters of household refrigerators, which increases the complexity of production. Some car refrigerators use inverter circuits to invert the DC power of the car power supply into 220V AC power so that the defrost heaters of household refrigerators can be used. However, this method requires the use of inverter circuits, which have complex circuit structures, low conversion efficiency, and the need to adapt to the insulation of high-voltage AC power, which increases the cost. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model proposes a vehicle refrigerator circuit, which can adapt to voltages of different ranges by boosting the voltage of the vehicle power supply to a preset voltage, and the output voltage is stabilized at the preset voltage, which can avoid power fluctuations of the defrost heater and stabilize the defrosting effect.

[0005] The utility model also provides a vehicle-mounted refrigerator.

[0006] According to the vehicle refrigerator circuit of the first aspect embodiment of the utility model, it includes: an input connection module, which is used to connect to a vehicle power supply; a boost module, the input end of the boost module is connected to the input connection module; a defrost drive module, the output end of the boost module is connected to the defrost drive module, and the defrost drive module is used to connect to a defrost heater; a main control module, the output end of the boost module is connected to the main control module, and the main control module is connected to the controlled end of the defrost drive module; wherein the boost module is used to boost different input voltages to a preset voltage.

[0007] According to one embodiment of the utility model, the boost module includes an input detection unit, a control unit, a boost inductor, a boost capacitor and a switch unit, one end of the boost inductor is respectively connected to the input detection unit and the input connection module, the other end of the boost inductor is connected to the boost capacitor through the switch unit, the boost capacitor is respectively connected to the defrost drive module and the main control module, the input detection unit is connected to the control unit, and the control unit is connected to the controlled end of the switch unit.

[0008] According to an embodiment of the present utility model, the boost module further includes a voltage feedback unit, and the voltage feedback unit is respectively connected to the boost capacitor and the feedback end of the control unit.

[0009] According to one embodiment of the utility model, the switching unit includes a first switching tube and a second switching tube, one end of the first switching tube and one end of the second switching tube are both connected to the other end of the boost inductor, the other end of the first switching tube is grounded, and the other end of the second switching tube is connected to the boost capacitor, and the control unit is respectively connected to the controlled end of the first switching tube and the controlled end of the second switching tube to turn on one of the first switching tube and the second switching tube and turn off the other.

[0010] According to an embodiment of the present utility model, the boost module further includes an absorption unit, which is connected to the second switch tube and is used to absorb the spike generated by the switching state of the second switch tube.

[0011] According to one embodiment of the utility model, the absorption unit includes an absorption resistor and an absorption capacitor, the absorption resistor and the absorption capacitor are connected in series to form a series branch, one end of the series branch is connected to one end of the second switch tube, and the other end of the series branch is connected to the other end of the second switch tube.

[0012] According to one embodiment of the utility model, the voltage feedback unit includes a first voltage-dividing resistor and a second voltage-dividing resistor, one end of the first voltage-dividing resistor is connected to the boost capacitor, the other end of the first voltage-dividing resistor is respectively connected to one end of the second voltage-dividing resistor and a feedback end of the control unit, and the other end of the second voltage-dividing resistor is grounded.

[0013] According to one embodiment of the utility model, the input detection unit includes a first detection resistor, a second detection resistor, a third detection resistor and a detection capacitor, one end of the first detection resistor is respectively connected to the input connection module and one end of the second detection resistor, the other end of the first detection resistor is respectively connected to the boost inductor and one end of the third detection resistor, the other end of the second detection resistor is respectively connected to one end of the detection capacitor and the control unit, and the other end of the third detection resistor is respectively connected to the other end of the detection capacitor and the control unit.

[0014] The vehicle refrigerator according to the second embodiment of the utility model comprises: a body, on which the above-mentioned vehicle refrigerator circuit is arranged, and a defrost heater is also arranged on the body, and the defrost drive module is connected to the defrost heater.

[0015] According to one embodiment of the utility model, a variable frequency drive module, a compressor, a display module and a temperature and humidity detection module are also provided on the body, the output end of the boost module is connected to the variable frequency drive module, the main control module is respectively connected to the variable frequency drive module, the display module and the temperature and humidity detection module, and the variable frequency drive module is connected to the compressor.

[0016] The above one or more technical solutions in the embodiments of the utility model have at least the following technical effects:

[0017] The input connection module is connected to the vehicle power supply to obtain the input voltage, and the input voltage is boosted by the boost module to boost it to a preset voltage, thereby supplying power to the defrost drive module and the main control module, so that the defrost drive module can stably drive the defrost heater to work. For different vehicle power supply voltages, the boost module is used to boost the output voltage to a preset voltage to achieve the effect of adapting to the voltage range of different vehicle power supplies. At the same time, the boost process increases the voltage, which can reduce the resistance requirements for the defrost heater, which is beneficial to the defrost heater of general household refrigerator models and improves versatility. In addition, the output voltage of the boost module is maintained at a preset voltage, which stabilizes the power of the defrost heater and avoids fluctuations, which is beneficial to stabilizing the defrost effect.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a vehicle refrigerator circuit provided by an embodiment of the utility model;

[0021] Figure 2 It is a circuit diagram of a boost module in one embodiment of the vehicle refrigerator circuit provided by the utility model.

[0022] Reference numerals:

[0023] 100, input connection module; 200, boost module; 300, defrost drive module; 400, main control module; 210, input detection unit; 220, control unit; 230, boost inductor; 240, boost capacitor; 250, switch unit; 260, voltage feedback unit; 251, first switch tube; 252, second switch tube; 270, absorption unit; 500, defrost heater; 600, variable frequency drive module; 700, compressor; 800, display module; 900, temperature and humidity detection module. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the implementation of the present utility model in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0025] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0027] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0029] The voltage of the vehicle power supply varies with the amount of electricity. For example, the voltage of a 12V power supply may actually vary from 14V to 9V with the amount of electricity. This means that when the defrost heater 500 is at a voltage of 14V, the temperature of the heating tube may be too high due to the voltage being too high, posing a fire hazard. When the voltage is 9V, the defrost efficiency may be low and defrosting may not be timely due to the voltage being too low. At the same time, the voltage of the vehicle power supply is generally in the range of 12V or 24V, which is lower than the 220V voltage used in households. In order to ensure the defrosting effect of the defrost heater 500, it is necessary to increase the diameter of the defrost heater 500 and use multiple tubes in parallel, that is, it is necessary to change the structure of the defrost heater 500. The defrost heater 500 of a household refrigerator cannot be used universally, and corresponding differentiated designs are also required for different voltage ranges, which increases production costs. The universal household refrigerator defrost heater 500 is realized by an inverter, but there are problems such as complex circuit structure, low conversion efficiency, and the need to adapt to the insulation of high-voltage AC to increase costs.

[0030] In addition, the voltage range of the vehicle power supply is lower than the voltage range of the household 220V, which requires the resistance of the defrost heater 500 to be increased to maintain appropriate defrost power, which means that the defrost heater 500 needs to be redesigned and cannot be used as the defrost heater 500 for household refrigerators.

[0031] For the above situation, the utility model provides a vehicle refrigerator circuit and a vehicle refrigerator, which can adapt to the voltage range of different vehicle power supplies, and boost the output voltage to a preset voltage, and can use the defrost heater 500 of a universal household refrigerator. At the same time, the output voltage is stabilized at the preset voltage, avoiding power fluctuations of the defrost heater 500 and stabilizing the defrosting effect.

[0032] refer to Figure 1 and Figure 2 The utility model provides a vehicle refrigerator circuit, including: an input connection module 100, used to connect to a vehicle power supply; a boost module 200, the input end of the boost module 200 is connected to the input connection module 100; a defrost drive module 300, the output end of the boost module 200 is connected to the defrost drive module 300; a main control module 400, the output end of the boost module 200 is connected to the main control module 400, and the main control module 400 is connected to the controlled end of the defrost drive module 300; wherein the boost module 200 is used to boost different input voltages to a preset voltage.

[0033] The input connection module 100 is connected to the vehicle power supply to obtain the input voltage, and the input voltage is boosted by the boost module 200 to be boosted to a preset voltage, thereby supplying power to the defrost drive module 300 and the main control module 400, so that the defrost drive module 300 can stably drive the defrost heater 500 to work. For different vehicle power supply voltages, the boost module 200 is used to boost the output voltage to a preset voltage, so as to achieve the effect of adapting to the voltage range of different vehicle power supplies. At the same time, the boost process increases the voltage, which can reduce the resistance requirement of the defrost heater 500, which is beneficial to the defrost heater 500 of the general household refrigerator model and improves the versatility. In addition, the output voltage of the boost module 200 is maintained at a preset voltage, so that the power of the defrost heater 500 is stable and avoids fluctuations, which is beneficial to the stable defrosting effect.

[0034] In some embodiments of the utility model, after the boost module 200 performs a boost process on the input voltage, that is, the voltage of the vehicle power supply, the preset voltage of the output voltage can be 36V, 48V, etc. It can be understood that the preset voltages are all greater than the conventional 12V and 24V of the vehicle power supply. When the voltage of the vehicle power supply is 12V, if the power of the defrost heater 500 is to be kept the same as that of the 220V case, the resistance of the defrost heater 500 needs to be increased by about 336 times, and the pipe diameter needs to be greatly adjusted; and by performing a boost process on the vehicle power supply through the boost module 200, the resistance requirement of the defrost heater 500 is greatly reduced, and the defrost heater 500 can be designed using the common 8mm and 6mm steel pipe specifications, which is common with the defrost heater 500 of a household refrigerator, which is conducive to improving versatility.

[0035] In some embodiments of the present invention, the input connection module 100 may be implemented as a device including connection pins, connection plugs, etc. The main control module 400 may be implemented as a device including a single chip microcomputer, an embedded chip, etc. having a control function.

[0036] refer to Figure 2 In some embodiments of the vehicle refrigerator circuit of the utility model, the boost module 200 includes an input detection unit 210, a control unit 220, a boost inductor 230, a boost capacitor 240 and a switch unit 250. One end of the boost inductor 230 is respectively connected to the input detection unit 210 and the input connection module 100, and the other end of the boost inductor 230 is connected to the boost capacitor 240 through the switch unit 250. The boost capacitor 240 is respectively connected to the defrost drive module 300 and the main control module 400. The input detection unit 210 is connected to the control unit 220, and the control unit 220 is connected to the controlled end of the switch unit 250.

[0037] The boost inductor 230, the switch unit 250 and the boost capacitor 240 form a Boost circuit. Based on the principle of the Boost circuit, the switch unit 250 increases the current flowing through the boost inductor 230 by connecting the boost inductor 230 to the ground. The boost inductor 230 converts electrical energy into magnetic energy for storage. The switch unit 250 connects the boost inductor 230 and the boost capacitor 240. The boost inductor 230 releases the stored magnetic energy and converts it into electrical energy, which is superimposed with the voltage of the vehicle power supply to form a voltage greater than the vehicle power supply, thereby achieving a boost effect. The boost capacitor 240 also stores electrical energy at this time to continue the current when the boost inductor 230 stores energy to maintain the output voltage. The input detection unit 210 detects the voltage and / or current of the input connection module 100 and transmits it to the control unit 220. The control unit 220 controls the on / off time of the switch unit 250 according to the detected voltage and / or current, so that the output voltage formed by the boost capacitor 240 is consistent with the preset voltage, thereby achieving the effect of boosting different input voltages to the preset voltage.

[0038] In some embodiments of the present invention, there may be multiple boost capacitors 240 , and multiple boost capacitors 240 are connected in parallel to increase the equivalent capacitance value to meet circuit requirements.

[0039] It is understandable that during the actual circuit operation, the output voltage of the Boost circuit will inevitably have ripples and produce small fluctuations, that is, the output voltage through the boost capacitor 240 will produce small fluctuations in the preset voltage, but for the device operation, it can be considered as a constant direct current. Therefore, boosting to the preset voltage means within the ripple range of the preset voltage, and is not fixed.

[0040] refer to Figure 2 In some embodiments of the vehicle refrigerator circuit of the utility model, the boost module 200 further includes a voltage feedback unit 260, and the voltage feedback unit 260 is connected to the boost capacitor 240 and the feedback end of the control unit 220 respectively.

[0041] A voltage feedback unit 260 is provided to be connected to the boost capacitor 240 to detect and obtain the actual output voltage and feed it back to the control unit 220, so that the control unit 220 controls the switch unit 250 based on the feedback detection voltage value, thereby making the output voltage more stable and reliable, which is beneficial to improving the reliability of the circuit.

[0042] refer to Figure 2In some embodiments of the vehicle refrigerator circuit of the utility model, the switch unit 250 includes a first switch tube 251 and a second switch tube 252, one end of the first switch tube 251 and one end of the second switch tube 252 are both connected to the other end of the boost inductor 230, the other end of the first switch tube 251 is grounded, and the other end of the second switch tube 252 is connected to the boost capacitor 240, and the control unit 220 is respectively connected to the controlled end of the first switch tube 251 and the controlled end of the second switch tube 252 to make one of the first switch tube 251 and the second switch tube 252 turned on and the other turned off.

[0043] The control unit 220 synchronously controls the first switch tube 251 and the second switch tube 252, so that one of them is turned on and the other is turned off, adapting to the working process of the Boost circuit, and realizing the boost processing function. At the same time, the structure of the first switch tube 251 and the second switch tube 252 is adopted. Since the voltage drop when the first switch tube 251 and the second switch tube 252 are turned on is very small, the conduction loss can be reduced. Therefore, by synchronously controlling the first switch tube 251 and the second switch tube 252, it is beneficial to improve the conversion efficiency of the circuit.

[0044] In some embodiments of the present invention, the first switch tube 251 and the second switch tube 252 may be implemented as field effect tubes, triodes, IGBT tubes and other devices.

[0045] refer to Figure 2 In some embodiments of the vehicle refrigerator circuit of the utility model, the boost module 200 also includes an absorption unit 270, which is connected to the second switch tube 252, and the absorption unit 270 is used to absorb the spike generated by the switching state of the second switch tube 252.

[0046] Since the second switch tube 252 flows with a current that has been boosted when it is turned on, the current has a large magnitude, so the second switch tube 252 generates a large voltage and current spike at the moment of being turned on and off. The absorption unit 270 is connected to the second switch tube 252 to absorb the voltage and current spikes generated when the second switch tube 252 switches on and off, which is beneficial to avoid the spikes from damaging other devices in the circuit and improve the reliability of the circuit.

[0047] refer to Figure 2 In some embodiments of the vehicle refrigerator circuit of the utility model, the absorption unit 270 includes an absorption resistor R1 and an absorption capacitor C1. The absorption resistor R1 and the absorption capacitor C1 are connected in series to form a series branch. One end of the series branch is connected to one end of the second switch tube 252, and the other end of the series branch is connected to the other end of the second switch tube 252.

[0048] The absorption resistor R1 and the absorption capacitor C1 are connected in series to form a series branch. The peak part formed when the second switch tube 252 is turned on and off will flow through the series branch, thereby weakening the peak, thereby achieving the effect of absorbing the peak generated by the switching state of the second switch tube 252. The circuit structure is simple and easy to implement.

[0049] refer to Figure 2 In some embodiments of the vehicle refrigerator circuit of the utility model, the voltage feedback unit 260 includes a first voltage-dividing resistor R75 and a second voltage-dividing resistor R73, one end of the first voltage-dividing resistor R75 is connected to the boost capacitor 240, the other end of the first voltage-dividing resistor R75 is respectively connected to one end of the second voltage-dividing resistor R73 and the feedback end of the control unit 220, and the other end of the second voltage-dividing resistor R73 is grounded.

[0050] The first voltage-dividing resistor R75 and the second voltage-dividing resistor R73 form a voltage-dividing circuit, which divides the output voltage to form a detection voltage in a suitable range and feeds it back to the control unit 220 to achieve the effect of voltage feedback. In this way, the function of voltage feedback is realized through the structure of the first voltage-dividing resistor R75 and the second voltage-dividing resistor R73, and the circuit structure is simple and easy to implement.

[0051] refer to Figure 2 In some embodiments of the vehicle refrigerator circuit of the utility model, the input detection unit 210 includes a first detection resistor R2, a second detection resistor R5, a third detection resistor R6 and a detection capacitor C8, one end of the first detection resistor R2 is respectively connected to the input connection module 100 and one end of the second detection resistor R5, the other end of the first detection resistor R2 is respectively connected to the boost inductor 230 and one end of the third detection resistor R6, the other end of the second detection resistor R5 is respectively connected to one end of the detection capacitor C8 and the control unit 220, and the other end of the third detection resistor R6 is respectively connected to the other end of the detection capacitor C8 and the control unit 220.

[0052] The vehicle power supply inputs voltage through the input connection module 100, and under the action of the voltage, a current flowing through the boost inductor 230 is formed to make the boost inductor 230 store energy to achieve boost processing. The current flowing through the first detection resistor R2 can be considered to be equal to the current of the boost inductor 230. The voltage across the first detection resistor R2 is obtained through the second detection resistor R5 and the third detection resistor R6 respectively and transmitted to the control unit 220. The control unit 220 can determine the magnitude of the current flowing through the first test resistor based on the obtained voltage, that is, the magnitude of the current of the boost inductor 230, so as to achieve the effect of current detection of the boost inductor 230, and facilitate the control of the switch unit 250 according to the energy storage situation of the boost inductor 230, so that the output voltage after the boost processing is consistent with the preset voltage. In addition, by connecting a detection capacitor C8 between the second detection resistor R5 and the third detection resistor R6, the influence of voltage fluctuations can be filtered out, which is conducive to more accurate detection of the current of the boost inductor 230.

[0053] In some embodiments of the vehicle refrigerator circuit of the utility model, the defrost driving module 300 includes a relay, the output end of the boost module 200 is connected to the contact of the relay, and the main control module 400 is connected to the coil of the relay.

[0054] The main control module 400 controls the current flowing through the relay coil and then controls the closing of the relay contacts, so that the output voltage of the boost module 200 can be transmitted to the defrost heater 500, driving the defrost heater 500 to work, or the main control module 400 controls the opening of the relay contacts, so that the output voltage of the boost module 200 cannot be transmitted to the defrost heater 500, and the defrost heater 500 stops working.

[0055] In some embodiments of the present invention, the defrost driving module 300 may be implemented in a manner including not only a relay but also a switch tube and other devices.

[0056] refer to Figure 1 The utility model also provides a vehicle refrigerator, including: a body, the body is provided with the above-mentioned vehicle refrigerator circuit, the body is also provided with a defrost heater 500, and the defrost drive module 300 is connected to the defrost heater 500.

[0057] The body of the vehicle refrigerator, the input connection module 100 is connected to the vehicle power supply to obtain the input voltage, the input voltage is boosted by the boost module 200 to boost to a preset voltage, and then the defrost drive module 300 and the main control module 400 are powered. Under the control of the main control module 400, the defrost drive module 300 can drive the defrost heater 500 to work stably. For different vehicle power supply voltages, the boost module 200 is used to boost the output voltage to a preset voltage, so as to achieve the effect of adapting to the voltage range of different vehicle power supplies. At the same time, the boost process increases the voltage, which can reduce the resistance requirement of the defrost heater 500, which is beneficial to the defrost heater 500 of the general household refrigerator model and improves the versatility. In addition, the output voltage of the boost module 200 is maintained at a preset voltage, so that the power of the defrost heater 500 is stable and avoids fluctuations, which is beneficial to the stable defrosting effect.

[0058] In this way, the vehicle refrigerator can use the defrost heater 500 of the household refrigerator without the need for redesign and development and differentiated design for different vehicle power supplies, which is conducive to reducing production costs and improving production efficiency.

[0059] refer to Figure 1 In some embodiments of the vehicle refrigerator of the utility model, a variable frequency drive module 600, a compressor 700, a display module 800 and a temperature and humidity detection module 900 are also provided on the body, the output end of the boost module 200 is connected to the variable frequency drive module 600, the main control module 400 is respectively connected to the variable frequency drive module 600, the display module 800 and the temperature and humidity detection module 900, and the variable frequency drive module 600 is connected to the compressor 700.

[0060] The variable frequency drive module 600 drives the compressor 700 to work to achieve the refrigeration function. At the same time, the main control module 400 obtains the temperature and humidity information of the body according to the temperature and humidity detection module 900, and then controls the variable frequency drive module 600 to drive the working frequency of the compressor 700 to maintain the temperature and humidity within an appropriate range. The main control module 400 displays the current refrigeration temperature and other information through the display module 800 for easy use.

[0061] In some embodiments of the present invention, the variable frequency drive module 600 may be an implementation including a variable frequency circuit board, the display module 800 may be an implementation including a display control circuit board and a display screen, and the temperature and humidity detection module 900 may be an implementation including a temperature sensor and a humidity sensor.

[0062] In some embodiments of the utility model, a control module connected to the main control module 400 is further provided on the body. By providing the control module, the user can generate temperature adjustment instructions through the control module to control parameters such as the refrigeration temperature of the vehicle refrigerator. Other load devices such as indicator lights connected to the main control module 400 can also be provided on the body.

[0063] It should be noted that, under the control of the main control module 400, the defrost heater 500 and the compressor 700 work in a time-sharing manner. Even if the input voltage of the defrost heater 500 is increased by the boost module 200, the total power will not increase.

[0064] Finally, it should be noted that the above implementation modes are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. Car refrigerator circuit, characterized in that, include: An input connection module, used for connecting to a vehicle power supply; A boost module, the input end of which is connected to the input connection module; A defrost driving module, the output end of the boost module is connected to the defrost driving module, and the defrost driving module is used to be connected to a defrost heater; A main control module, the output end of the boost module is connected to the main control module, and the main control module is connected to the controlled end of the defrost drive module; The boost module is used to boost different input voltages to a preset voltage.

2. The vehicle refrigerator circuit according to claim 1, characterized in that: The boost module includes an input detection unit, a control unit, a boost inductor, a boost capacitor and a switch unit. One end of the boost inductor is respectively connected to the input detection unit and the input connection module, the other end of the boost inductor is connected to the boost capacitor through the switch unit, the boost capacitor is respectively connected to the defrost drive module and the main control module, the input detection unit is connected to the control unit, and the control unit is connected to the controlled end of the switch unit.

3. The vehicle refrigerator circuit according to claim 2, characterized in that: The boost module further includes a voltage feedback unit, and the voltage feedback unit is connected to the boost capacitor and the feedback end of the control unit respectively.

4. The vehicle refrigerator circuit according to claim 2, characterized in that: The switch unit includes a first switch tube and a second switch tube, one end of the first switch tube and one end of the second switch tube are both connected to the other end of the boost inductor, the other end of the first switch tube is grounded, and the other end of the second switch tube is connected to the boost capacitor, and the control unit is respectively connected to the controlled end of the first switch tube and the controlled end of the second switch tube to turn on one of the first switch tube and the second switch tube and turn off the other.

5. The vehicle refrigerator circuit according to claim 4, characterized in that: The boost module further includes an absorption unit, which is connected to the second switch tube and is used to absorb a peak generated by a switching state of the second switch tube.

6. The vehicle refrigerator circuit according to claim 5, characterized in that: The absorption unit includes an absorption resistor and an absorption capacitor, the absorption resistor and the absorption capacitor are connected in series to form a series branch, one end of the series branch is connected to one end of the second switch tube, and the other end of the series branch is connected to the other end of the second switch tube.

7. The vehicle refrigerator circuit according to claim 3, characterized in that: The voltage feedback unit includes a first voltage-dividing resistor and a second voltage-dividing resistor, one end of the first voltage-dividing resistor is connected to the boost capacitor, the other end of the first voltage-dividing resistor is respectively connected to one end of the second voltage-dividing resistor and a feedback end of the control unit, and the other end of the second voltage-dividing resistor is grounded.

8. The vehicle refrigerator circuit according to claim 2, characterized in that: The input detection unit includes a first detection resistor, a second detection resistor, a third detection resistor and a detection capacitor, one end of the first detection resistor is respectively connected to the input connection module and one end of the second detection resistor, the other end of the first detection resistor is respectively connected to the boost inductor and one end of the third detection resistor, the other end of the second detection resistor is respectively connected to one end of the detection capacitor and the control unit, and the other end of the third detection resistor is respectively connected to the other end of the detection capacitor and the control unit.

9. A vehicle refrigerator, characterized in that: The invention comprises: a body, on which the vehicle refrigerator circuit according to any one of claims 1 to 8 is arranged, and a defrost heater is also arranged on the body, and the defrost drive module is connected to the defrost heater.

10. The vehicle refrigerator according to claim 9, characterized in that: The body is also provided with a variable frequency drive module, a compressor, a display module and a temperature and humidity detection module. The output end of the boost module is connected to the variable frequency drive module, the main control module is respectively connected to the variable frequency drive module, the display module and the temperature and humidity detection module, and the variable frequency drive module is connected to the compressor.

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