Vehicle-mounted refrigerator and driving circuit thereof

Abstract

The utility model discloses a car refrigerator and drive circuit, including boost circuit, frequency conversion control circuit, refrigerator compressor and controller, boost circuit includes boost control chip, MOS transistor TR1 and MOS transistor TR4, boost control chip's two output port are connected to the gate of two MOS transistor respectively, MOS transistor TR1's source electrode outputs second voltage, MOS transistor TR4's source electrode outputs second voltage, and MOS transistor TR4's source electrode outputs second voltage. The drain electrode of the MOS tube TR1 is connected with the source electrode of the MOS tube TR4; the drain electrode of the MOS tube TR4 is grounded through a current detection circuit; an automobile battery is connected between the two MOS tubes through an inductor, and an HS port of the boost control chip is connected between the two MOS tubes; the frequency conversion control circuit is connected with a second voltage; the controller outputs a control signal to the frequency conversion control circuit, receives a current detection signal, and outputs a signal to the boost control chip. The voltage of the automobile battery is increased and kept stable through the booster circuit, and the refrigeration effect of the vehicle-mounted refrigerator is improved. The booster circuit is detected and controlled through the controller, and the working stability of the booster circuit is improved.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle refrigerator technology, specifically, it relates to a vehicle refrigerator and its driving circuit. Background Technology

[0002] With the rapid development of the refrigerator industry market, increasingly fierce market competition, and growing market demand, car refrigerators have become increasingly popular among outdoor enthusiasts due to their portability, leading to their rapid rise in popularity.

[0003] However, existing car refrigerators have the following drawbacks:

[0004] On the one hand, because different types of car batteries have different voltages, different drivers are needed to operate them. Car refrigerators have poor compatibility and cannot be matched with different types of cars at the same time.

[0005] On the other hand, car refrigerators have relatively high power requirements. Due to the low voltage of car batteries, the power of car refrigerators is limited, the compressor speed is low, and the cooling effect is poor.

[0006] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0007] This invention proposes a vehicle-mounted refrigerator and its driving circuit, which solves the technical problems of poor compatibility, limited power, and poor cooling effect of existing vehicle-mounted refrigerators.

[0008] To achieve the above-mentioned utility model / design objectives, the present utility model adopts the following technical solution:

[0009] A vehicle-mounted refrigerator drive circuit, the drive circuit comprising:

[0010] A boost circuit, connected to the car battery, generates a second voltage; the boost circuit includes a boost control chip, MOSFET TR1, and MOSFET TR4.

[0011] The HO port of the boost control chip is connected to the gate of the MOS transistor TR1 through resistor R9. The source of the MOS transistor TR1 outputs a second voltage. The drain of the MOS transistor TR1 is connected to the source of the MOS transistor TR4. Resistor R12 is connected between the gate and drain of the MOS transistor TR1.

[0012] The LO port of the boost control chip is connected to the gate of the MOSFET TR4 through a resistor R1. The drain of the MOSFET TR4 is grounded through a current detection circuit. A resistor R3 is connected between the gate and drain of the MOSFET TR4.

[0013] The positive terminal of the car battery is connected to the drain of MOSFET TR1 and the source of MOSFET TR4 via an inductor, and the HS port of the boost control chip is connected to the drain of MOSFET TR1 and the source of MOSFET TR4.

[0014] The frequency converter control circuit is connected to the boost circuit and receives the second voltage.

[0015] The refrigerator compressor is connected to the inverter control circuit.

[0016] The controller outputs control signals to the frequency converter control circuit; receives detection signals from the current detection circuit, outputs PWM signals to the IN port of the boost control chip, and outputs enable signals to the EN port of the boost control chip.

[0017] In the vehicle refrigerator drive circuit described above, the resistor R9 is connected in parallel with the diode D3, the HO port of the boost control chip is connected to the negative terminal of the diode D3, and the gate of the MOSFET TR1 is connected to the positive terminal of the diode D3.

[0018] The resistor R1 is connected in parallel with the diode D1. The LO port of the boost control chip is connected to the negative terminal of the diode D1, and the gate of the MOSFET TR4 is connected to the positive terminal of the diode D1.

[0019] As described above in the vehicle refrigerator drive circuit, the boost control chip is connected to the vehicle battery via a temperature sensing on / off module;

[0020] Alternatively, the car battery is connected to a voltage regulator circuit, the output of which outputs a first voltage, and the boost control chip is connected to the output of the voltage regulator circuit via a temperature-sensing switch.

[0021] The temperature sensing on / off module is used to sense the temperature of MOSFET TR1 and MOSFET TR4.

[0022] In the vehicle refrigerator drive circuit described above, the VDD port of the boost control chip is connected to the temperature sensing on / off module through a resistor R74. The resistor R74 and the VDD port of the boost control chip are grounded through a Zener diode ZD1, and the resistor R74 and the VDD port of the boost control chip are grounded through a capacitor C10.

[0023] In the vehicle refrigerator drive circuit described above, the VDD port of the boost control chip is connected to the HB port of the boost control chip through diode D5, and a capacitor C12 is connected between the HB port and the HS port of the boost control chip.

[0024] As described above, in the vehicle refrigerator drive circuit, the current detection circuit includes a resistor R10 and a capacitor C9 connected in series. The resistor R10 is connected to the drain of the MOSFET TR4, and the capacitor C9 is grounded. The controller is used to receive the current between the resistor R10 and the capacitor C9.

[0025] In the vehicle refrigerator drive circuit described above, the source of the MOS transistor TR1 is grounded through several parallel capacitors.

[0026] In the vehicle refrigerator drive circuit described above, a capacitor C1 and a transient diode TVS1 are connected between the positive and negative terminals of the vehicle battery.

[0027] As described above, in the vehicle refrigerator drive circuit, the voltage regulator circuit includes a Zener diode. The input terminal of the Zener diode is connected to the positive terminal of the vehicle battery. The input terminal of the Zener diode is grounded through capacitor E1. The output terminal of the Zener diode outputs the first voltage. The output terminal of the Zener diode is grounded through capacitor E4.

[0028] The voltage regulator circuit includes a reverse connection protection circuit, which includes a reverse connection protection MOSFET. The reverse connection protection MOSFET is connected between the negative terminal of the car battery and ground, and is connected to the output terminal of the voltage regulator circuit through a resistor.

[0029] A vehicle-mounted refrigerator, the vehicle-mounted refrigerator including the above-described vehicle-mounted refrigerator drive circuit.

[0030] Compared with the prior art, the advantages and positive effects of this utility model are as follows: A vehicle-mounted refrigerator drive circuit includes a boost circuit, a frequency converter control circuit, a refrigerator compressor, and a controller. The boost circuit is connected to the car battery to generate a second voltage. The boost circuit includes a boost control chip, MOSFET TR1, and MOSFET TR4. The HO port of the boost control chip is connected to the gate of MOSFET TR1 through a resistor R9. The source of MOSFET TR1 outputs the second voltage. The drain of MOSFET TR1 is connected to the source of MOSFET TR4. A resistor R12 is connected between the gate and drain of MOSFET TR1. The LO port of the boost control chip is connected to the MOSFET TR4 through a resistor R1. The gate and drain of MOSFET TR4 are grounded through a current detection circuit, and a resistor R3 is connected between the gate and drain of MOSFET TR4. The positive terminal of the car battery is connected to the drain of MOSFET TR1 and the source of MOSFET TR4 through an inductor. The HS port of the boost control chip is connected to the drain of MOSFET TR1 and the source of MOSFET TR4. The frequency converter control circuit is connected to the boost circuit and receives the second voltage. The refrigerator compressor is connected to the frequency converter control circuit. The controller outputs a control signal to the frequency converter control circuit, receives the detection signal from the current detection circuit, outputs a PWM signal to the IN port of the boost control chip, and outputs an enable signal to the EN port of the boost control chip. This utility model's car refrigerator drive circuit uses a boost circuit to increase the voltage of the car battery and maintain its voltage stability, thus improving the compatibility and power of the car refrigerator and improving the cooling effect. At the same time, the controller detects and controls the boost circuit to improve the stability of the boost circuit's operation and provide a safe and stable voltage for the car refrigerator.

[0031] A vehicle-mounted refrigerator includes a drive circuit comprising a boost circuit, a frequency converter control circuit, a refrigerator compressor, and a controller. The boost circuit is connected to the vehicle battery and outputs a second voltage. The boost circuit includes a boost control chip, MOSFETs TR1 and TR4. The HO port of the boost control chip is connected to the gate of MOSFET TR1 through a resistor R9. The source of MOSFET TR1 outputs the second voltage. The drain of MOSFET TR1 is connected to the source of MOSFET TR4. A resistor R12 is connected between the gate and drain of MOSFET TR1. The LO port of the boost control chip is connected to the gate of MOSFET TR4 through a resistor R1. The drain of R4 is grounded through a current detection circuit, and resistor R3 is connected between the gate and drain of MOSFET TR4. The positive terminal of the car battery is connected to the drain of MOSFET TR1 and the source of MOSFET TR4 through an inductor. The HS port of the boost control chip is connected to the drain of MOSFET TR1 and the source of MOSFET TR4. The frequency converter control circuit is connected to the boost circuit and receives the second voltage. The refrigerator compressor is connected to the frequency converter control circuit. The controller outputs a control signal to the frequency converter control circuit, receives the detection signal from the current detection circuit, outputs a PWM signal to the IN port of the boost control chip, and outputs an enable signal to the EN port of the boost control chip. This utility model's vehicle refrigerator drive circuit uses a boost circuit to increase the voltage of the car battery and maintain its voltage stability, thus improving the compatibility and power of the vehicle refrigerator and improving the cooling effect. At the same time, the controller detects and controls the boost circuit to improve the stability of the boost circuit's operation and provide a safe and stable voltage for the vehicle refrigerator.

[0032] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of a specific embodiment of the present utility model.

[0035] Figure 2 This is a circuit diagram of the voltage regulator circuit and the boost circuit of a specific embodiment of this utility model.

[0036] Figure 3 This is a schematic diagram of a specific embodiment of the present utility model.

[0037] Figure 4This is a circuit diagram of the voltage regulator circuit and the boost circuit of a specific embodiment of this utility model.

[0038] Figure 5 This is a circuit diagram of a frequency converter control circuit according to a specific embodiment of this utility model.

[0039] Figure 6 This is a circuit diagram of the controller in a specific embodiment of this utility model. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0044] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0045] Because different car batteries have different voltages, car refrigerators cannot be adapted to cars with different voltages at the same time, resulting in poor compatibility. At the same time, because the car battery voltage is low, the car refrigerator has low power and poor cooling effect.

[0046] To address the aforementioned issues, a vehicle-mounted refrigerator drive circuit is proposed. By adding a boost circuit, the voltage of the vehicle battery is increased and kept stable to ensure the power requirements and safety of the vehicle-mounted refrigerator. Consequently, the compatibility and power of the vehicle-mounted refrigerator are improved, and the cooling effect is enhanced.

[0047] The drive circuit for a vehicle-mounted refrigerator includes: a boost circuit, a frequency converter control circuit, a refrigerator compressor, and a controller.

[0048] The boost circuit is connected to the car battery and outputs a second voltage.

[0049] The boost circuit includes a boost control chip, MOSFET TR1, and MOSFET TR4.

[0050] The HO port of the boost control chip is connected to the gate of MOSFET TR1 through resistor R9. The source of MOSFET TR1 outputs the second voltage. The drain of MOSFET TR1 is connected to the source of MOSFET TR4. Resistor R12 is connected between the gate and drain of MOSFET TR1.

[0051] The LO port of the boost control chip is connected to the gate of MOSFET TR4 through resistor R1. The drain of MOSFET TR4 is grounded through the current detection circuit. Resistor R3 is connected between the gate and drain of MOSFET TR4.

[0052] The positive terminal of the car battery is connected to the drain of MOSFET TR1 and the source of MOSFET TR4 through an inductor, and the HS port of the boost control chip is connected to the drain of MOSFET TR1 and the source of MOSFET TR4.

[0053] The frequency converter control circuit is connected to the boost circuit and receives a second voltage.

[0054] The refrigerator compressor is connected to the inverter control circuit.

[0055] The controller outputs control signals to the frequency converter control circuit, receives detection signals from the current detection circuit, outputs PWM signals to the IN port of the boost control chip, and outputs enable signals to the EN port of the boost control chip.

[0056] The vehicle refrigerator drive circuit uses a boost circuit to increase the voltage of the car battery and maintain its voltage stability, thereby improving the compatibility and power of the vehicle refrigerator and enhancing the cooling effect. The boost circuit is detected and controlled by a controller to improve the stability of the boost circuit operation and provide a safe and stable voltage for the vehicle refrigerator.

[0057] In some embodiments, the drive circuit includes a voltage regulator circuit connected to the vehicle battery, and the output of the voltage regulator circuit outputs a first voltage. The first voltage is used to power the controller, and the vehicle battery powers the boost circuit.

[0058] exist Figure 1 , Figure 2 In the example, the vehicle refrigerator drive circuit includes: a voltage regulator circuit, a boost circuit, a frequency converter control circuit, a refrigerator compressor, and a controller. The following describes each component of the vehicle refrigerator drive circuit:

[0059] Car batteries are rechargeable batteries, capable of being charged and discharged.

[0060] Powering a car refrigerator using a car battery.

[0061] Terminal CN2 is used to connect to the negative terminal PGND of the car battery, and terminal CN1 is used to connect to the positive terminal P+ of the car battery.

[0062] A capacitor C1 and a transient diode TVS1 are connected between the positive and negative terminals of the car battery.

[0063] That is, a capacitor C1 and a transient diode TVS1 are connected between terminals CN1 and CN2.

[0064] Capacitor C1 can filter the power supply and suppress interference to ensure the normal operation of the circuit.

[0065] The transient diode TVS1 can protect the car refrigerator from overvoltage damage.

[0066] The voltage regulator circuit is connected to the car battery. The voltage regulator circuit generates a first voltage of +12V, which is used to power the controller U1.

[0067] The voltage regulator circuit includes a Zener diode IC1. The input terminal INPUT of Zener diode IC1 is connected to the positive terminal P+ of the car battery. The input terminal INPUT of Zener diode IC1 is grounded through capacitor E1. The output terminal OUTPUT of Zener diode IC1 outputs a first voltage of +12V. The output terminal OUTPUT of Zener diode IC1 is grounded through capacitor E4, and the +12V voltage is also grounded through capacitor E4. The ground terminal GND of Zener diode IC1 is grounded.

[0068] To prevent damage to the car refrigerator caused by reverse connection between the car refrigerator and the car battery, the voltage regulator circuit includes a reverse connection protection circuit.

[0069] The reverse connection protection circuit includes a reverse connection protection MOSFET TR3, which is connected between the negative terminal of the car battery and ground. The reverse connection protection MOSFET TR1 is connected to the output terminal OUTPUT of the voltage regulator circuit through resistors R5 and R4.

[0070] Specifically, the drain and source of the reverse polarity-protected MOSFET TR3 are connected between terminal CN2 and ground, and the gate of the reverse polarity-protected MOSFET TR3 is connected to the output terminal OUTPUT of the voltage regulator circuit through resistors R5 and R4.

[0071] The boost circuit is connected to the car battery. Specifically, the boost circuit is connected to terminal CN1, and the car battery supplies power to the boost circuit.

[0072] The boost circuit outputs a second voltage, VOUT.

[0073] The boost circuit includes boost control chip IC2, MOSFET TR1, and MOSFET TR4.

[0074] The HO port of boost control chip IC2 is connected to the gate of MOSFET TR1 through resistor R9. The source of MOSFET TR1 outputs a second voltage, and the drain of MOSFET TR1 is connected to the source of MOSFET TR4. Resistor R12 is connected between the gate and drain of MOSFET TR1. The output signal of the HO port of boost control chip IC2 is used to control the on / off state of MOSFET TR1.

[0075] The LO port of the boost control chip is connected to the gate of MOSFET TR4 through resistor R1. The drain of MOSFET TR4 is grounded through a current sensing circuit. Resistor R3 is connected between the gate and drain of MOSFET TR4. The output signal of the LO port of boost control chip IC2 is used to control the on / off state of MOSFET TR4.

[0076] The positive terminal P+ of the car battery is connected between the drain of MOSFET TR1 and the source of MOSFET TR4 through inductor L1, and the HS port of boost control chip IC2 is connected between the drain of MOSFET TR1 and the source of MOSFET TR4.

[0077] A diode D3 is connected in parallel with resistor R9. The HO port of the boost control chip IC2 is connected to the negative terminal of diode D3, and the gate of MOSFET TR1 is connected to the positive terminal of diode D3.

[0078] Setting diode D3 to discharge resistor R9 can reduce the switching turn-off loss of MOSFET TR1, increase the boost rate, and reduce the heat generated by MOSFET TR1.

[0079] A diode D1 is connected in parallel with resistor R1. The LO port of boost control chip IC2 is connected to the negative terminal of diode D1, and the gate of MOSFET TR4 is connected to the positive terminal of diode D1.

[0080] Setting diode D1 can discharge resistor R1, which can reduce the switching and turn-off losses of MOSFET TR4, resulting in a higher boost rate and reduced heat generation of MOSFET TR4.

[0081] The boost control chip IC2 is connected to the car battery through a temperature sensing on / off module, and the car battery supplies power to the boost control chip IC2.

[0082] The temperature sensing on / off module is a temperature sensing switch KSD1. The boost control chip IC2 is connected to the car battery through the temperature sensing switch KSD1. The temperature sensing switch is used to sense the temperature of MOSFET TR1 and MOSFET TR4.

[0083] In some other embodiments, the temperature sensing on / off module may include a temperature detection module, a controller, and a controlled switch. The temperature detection module is used to detect the temperature of MOSFETs TR1 and TR4. The controller controls the on / off state of the controlled switch based on the temperature of MOSFETs TR1 and TR4 to control whether the car battery supplies power to the boost control chip IC2.

[0084] The VDD port of the boost control chip IC2 is connected to the temperature sensor KSD1 via resistor R74. A Zener diode ZD1 connects resistor R74 and the VDD port of the boost control chip IC2 to ground, and a capacitor C10 connects resistor R74 and the VDD port of the boost control chip to ground. Zener diode ZD1 provides power supply protection, and capacitor C10 provides filtering.

[0085] The VDD port of the boost control chip IC2 is connected to the HB port of the boost control chip via diode D5. A capacitor C12 is connected between the HB port and the HS port of the boost control chip IC2. Diode D5 is used to limit the current charging of capacitor C12.

[0086] The current detection circuit includes a resistor R10 and a capacitor C9 connected in series. Resistor R10 is connected to the drain of MOSFET TR4, and capacitor C9 is grounded. The drain of MOSFET TR4 is also grounded through resistors R13 and R14 connected in parallel. Controller U1 is used to receive the current between resistor R10 and capacitor C9.

[0087] The source of MOSFET TR1 is grounded through several capacitors connected in parallel. The source of MOSFET TR1 is also grounded through capacitors E2, E3, C5, C6, and C7 connected in parallel. Controller U1 outputs a PWM signal to the IN port of boost control chip IC2. The LO and HO ports of boost control chip IC2 output high and low levels according to the PWM signal. When the LO port of boost control chip IC2 outputs a high level and the HO port outputs a low level, MOSFET TR1 is turned off and MOSFET TR4 is turned on, allowing the car battery to charge inductor L1. When the LO port of boost control chip IC2 outputs a low level and the HO port outputs a high level, MOSFET TR1 is turned on and MOSFET TR4 is turned off, and the source of MOSFET TR1 outputs a second voltage VOUT.

[0088] exist Figure 3 , Figure 4 In the example, the vehicle refrigerator drive circuit includes: a voltage regulator circuit, a boost circuit, a frequency converter control circuit, a refrigerator compressor, and a controller. The following describes each component of the vehicle refrigerator drive circuit:

[0089] Car batteries are rechargeable batteries, capable of being charged and discharged.

[0090] Powering a car refrigerator using a car battery.

[0091] Terminal CN2 is used to connect to the negative terminal PGND of the car battery, and terminal CN1 is used to connect to the positive terminal P+ of the car battery.

[0092] A capacitor C1 and a transient diode TVS1 are connected between the positive and negative terminals of the car battery.

[0093] That is, a capacitor C1 and a transient diode TVS1 are connected between terminals CN1 and CN2.

[0094] Capacitor C1 can filter the power supply and suppress interference to ensure the normal operation of the circuit.

[0095] The transient diode TVS1 can protect the car refrigerator from overvoltage damage.

[0096] The voltage regulator circuit is connected to the car battery. The voltage regulator circuit generates a first voltage of +12V, which is used to power the boost circuit and the controller U1.

[0097] The voltage regulator circuit includes a Zener diode IC1. The input terminal INPUT of Zener diode IC1 is connected to the positive terminal P+ of the car battery. The input terminal INPUT of Zener diode IC1 is grounded through capacitor E1. The output terminal OUTPUT of Zener diode IC1 outputs a first voltage of +12V. The output terminal OUTPUT of Zener diode IC1 is grounded through capacitor E4, and the +12V voltage is also grounded through capacitor E4. The ground terminal GND of Zener diode IC1 is grounded.

[0098] To prevent damage to the car refrigerator caused by reverse connection between the car refrigerator and the car battery, the voltage regulator circuit includes a reverse connection protection circuit.

[0099] The reverse connection protection circuit includes a reverse connection protection MOSFET TR3, which is connected between the negative terminal of the car battery and ground. The reverse connection protection MOSFET TR1 is connected to the output terminal OUTPUT of the voltage regulator circuit through resistors R5 and R4.

[0100] Specifically, the drain and source of the reverse polarity-protected MOSFET TR3 are connected between terminal CN2 and ground, and the gate of the reverse polarity-protected MOSFET TR3 is connected to the output terminal OUTPUT of the voltage regulator circuit through resistors R5 and R4.

[0101] The boost circuit and the voltage regulator circuit are connected. Specifically, the boost circuit is connected to the output terminal OUTPUT of the Zener diode IC1, and the voltage regulator circuit supplies power to the boost circuit.

[0102] The boost circuit outputs a second voltage, VOUT.

[0103] The boost circuit includes boost control chip IC2, MOSFET TR1, and MOSFET TR4.

[0104] The HO port of boost control chip IC2 is connected to the gate of MOSFET TR1 through resistor R9. The source of MOSFET TR1 outputs a second voltage, and the drain of MOSFET TR1 is connected to the source of MOSFET TR4. Resistor R12 is connected between the gate and drain of MOSFET TR1. The output signal of the HO port of boost control chip IC2 is used to control the on / off state of MOSFET TR1.

[0105] The LO port of the boost control chip is connected to the gate of MOSFET TR4 through resistor R1. The drain of MOSFET TR4 is grounded through a current sensing circuit. Resistor R3 is connected between the gate and drain of MOSFET TR4. The output signal of the LO port of boost control chip IC2 is used to control the on / off state of MOSFET TR4.

[0106] The positive terminal P+ of the car battery is connected between the drain of MOSFET TR1 and the source of MOSFET TR4 through inductor L1, and the HS port of boost control chip IC2 is connected between the drain of MOSFET TR1 and the source of MOSFET TR4.

[0107] A diode D3 is connected in parallel with resistor R9. The HO port of the boost control chip IC2 is connected to the negative terminal of diode D3, and the gate of MOSFET TR1 is connected to the positive terminal of diode D3.

[0108] Setting diode D3 to discharge resistor R9 can reduce the switching turn-off loss of MOSFET TR1, increase the boost rate, and reduce the heat generated by MOSFET TR1.

[0109] A diode D1 is connected in parallel with resistor R1. The LO port of boost control chip IC2 is connected to the negative terminal of diode D1, and the gate of MOSFET TR4 is connected to the positive terminal of diode D1.

[0110] Setting diode D1 can discharge resistor R1, which can reduce the switching and turn-off losses of MOSFET TR4, resulting in a higher boost rate and reduced heat generation of MOSFET TR4.

[0111] The boost control chip IC2 is connected to the voltage regulator module through a temperature sensing on / off module, and the voltage regulator module supplies power to the boost control chip IC2.

[0112] Among them, the temperature sensing on / off module is a temperature sensing switch KSD1. The boost control chip IC2 is connected to the output terminal of the voltage regulator module through the temperature sensing switch KSD1. The temperature sensing switch is used to sense the temperature of MOSFET TR1 and MOSFET TR4.

[0113] In some other embodiments, the temperature sensing on / off module may include a temperature detection module, a controller, and a controlled switch. The temperature detection module is used to detect the temperature of MOSFETs TR1 and TR4. The controller controls the on / off state of the controlled switch based on the temperature of MOSFETs TR1 and TR4 to control whether the voltage regulator module supplies power to the boost control chip IC2.

[0114] The VDD port of the boost control chip IC2 is connected to the temperature sensor KSD1 via resistor R74. A Zener diode ZD1 connects resistor R74 and the VDD port of the boost control chip IC2 to ground, and a capacitor C10 connects resistor R74 and the VDD port of the boost control chip to ground. Zener diode ZD1 provides power supply protection, and capacitor C10 provides filtering.

[0115] The VDD port of the boost control chip IC2 is connected to the HB port of the boost control chip via diode D5. A capacitor C12 is connected between the HB port and the HS port of the boost control chip IC2. Diode D5 is used to limit the current charging of capacitor C12.

[0116] The current detection circuit includes a resistor R10 and a capacitor C9 connected in series. Resistor R10 is connected to the drain of MOSFET TR4, and capacitor C9 is grounded. The drain of MOSFET TR4 is also grounded through resistors R13 and R14 connected in parallel. Controller U1 is used to receive the current between resistor R10 and capacitor C9.

[0117] The source of MOSFET TR1 is grounded through several capacitors connected in parallel. The source of MOSFET TR1 is also grounded through capacitors E2, E3, C5, C6, and C7 connected in parallel. Controller U1 outputs a PWM signal to the IN port of boost control chip IC2. The LO and HO ports of boost control chip IC2 output high and low levels according to the PWM signal. When the LO port of boost control chip IC2 outputs a high level and the HO port outputs a low level, MOSFET TR1 is turned off and MOSFET TR4 is turned on, allowing the car battery to charge inductor L1. When the LO port of boost control chip IC2 outputs a low level and the HO port outputs a high level, MOSFET TR1 is turned on and MOSFET TR4 is turned off, and the source of MOSFET TR1 outputs a second voltage VOUT.

[0118] The frequency converter control circuit is connected to the boost circuit and receives the second voltage VOUT.

[0119] exist Figure 5 In the example, the frequency converter control circuit includes HU, LU, HV, LV, HW, and LW connected to the controller U1. The frequency converter control circuit also includes MOSFETs TR2, TR5, TR6, TR8, TR9, and TR10, which are controlled by the controller's control signals. MOSFETs TR2 and TR5 are connected to the U terminal of terminal CN5, MOSFETs TR6 and TR8 are connected to the V terminal of terminal CN5, and MOSFETs TR9 and TR10 are connected to the W terminal of terminal CN5.

[0120] The refrigerator compressor is connected to the inverter control circuit; terminal CN5 of the inverter control circuit is connected to the compressor of the vehicle refrigerator.

[0121] exist Figure 6 In the example, controller U2 is used to output control signals HU, LU, HV, LV, HW, LW to the frequency converter control circuit.

[0122] The controller U2 is used to receive the detection signal ISENSE from the current detection circuit, output a PWM signal to the IN port of the boost control chip IC2, and output an enable signal to the EN port of the boost control chip IC2.

[0123] The car refrigerator drive circuit uses a voltage regulator circuit and a boost circuit to increase the voltage of the car battery and maintain its voltage stability, thereby improving the compatibility and power of the car refrigerator and enhancing the cooling effect.

[0124] A vehicle-mounted refrigerator, comprising a vehicle-mounted refrigerator drive circuit.

[0125] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A vehicle-mounted refrigerator drive circuit, characterized in that, The driving circuit includes: A boost circuit, connected to the car battery, generates a second voltage; the boost circuit includes a boost control chip, MOSFET TR1, and MOSFET TR4. The HO port of the boost control chip is connected to the gate of the MOS transistor TR1 through resistor R9. The source of the MOS transistor TR1 outputs a second voltage. The drain of the MOS transistor TR1 is connected to the source of the MOS transistor TR4. Resistor R12 is connected between the gate and drain of the MOS transistor TR1. The LO port of the boost control chip is connected to the gate of the MOSFET TR4 through a resistor R1. The drain of the MOSFET TR4 is grounded through a current detection circuit. A resistor R3 is connected between the gate and drain of the MOSFET TR4. The positive terminal of the car battery is connected to the drain of MOSFET TR1 and the source of MOSFET TR4 via an inductor, and the HS port of the boost control chip is connected to the drain of MOSFET TR1 and the source of MOSFET TR4. The frequency converter control circuit is connected to the boost circuit and receives the second voltage. The refrigerator compressor is connected to the inverter control circuit. The controller outputs control signals to the frequency converter control circuit; receives detection signals from the current detection circuit, outputs PWM signals to the IN port of the boost control chip, and outputs enable signals to the EN port of the boost control chip.

2. The vehicle-mounted refrigerator drive circuit according to claim 1, characterized in that, The resistor R9 is connected in parallel with the diode D3. The HO port of the boost control chip is connected to the negative terminal of the diode D3, and the gate of the MOSFET TR1 is connected to the positive terminal of the diode D3. The resistor R1 is connected in parallel with the diode D1. The LO port of the boost control chip is connected to the negative terminal of the diode D1, and the gate of the MOSFET TR4 is connected to the positive terminal of the diode D1.

3. The vehicle-mounted refrigerator drive circuit according to claim 1, characterized in that, The boost control chip is connected to the car battery via a temperature-sensing on / off module; Alternatively, the car battery is connected to a voltage regulator circuit, the output of which outputs a first voltage, and the boost control chip is connected to the output of the voltage regulator circuit via a temperature-sensing switch. The temperature sensing on / off module is used to sense the temperature of MOSFET TR1 and MOSFET TR4.

4. The vehicle-mounted refrigerator drive circuit according to claim 3, characterized in that, The VDD port of the boost control chip is connected to the temperature sensing on / off module through resistor R74. Resistor R74 and the VDD port of the boost control chip are grounded through Zener diode ZD1. Resistor R74 and the VDD port of the boost control chip are grounded through capacitor C10.

5. The vehicle-mounted refrigerator drive circuit according to claim 3, characterized in that, The VDD port of the boost control chip is connected to the HB port of the boost control chip through diode D5, and capacitor C12 is connected between the HB port and the HS port of the boost control chip.

6. The vehicle-mounted refrigerator drive circuit according to claim 1, characterized in that, The current detection circuit includes a resistor R10 and a capacitor C9 connected in series. The resistor R10 is connected to the drain of the MOSFET TR4, and the capacitor C9 is grounded. The controller is used to receive the current between the resistor R10 and the capacitor C9.

7. The vehicle-mounted refrigerator drive circuit according to claim 1, characterized in that, The source of the MOS transistor TR1 is grounded through several capacitors connected in parallel.

8. The vehicle-mounted refrigerator drive circuit according to claim 1, characterized in that, A capacitor C1 and a transient diode TVS1 are connected between the positive and negative terminals of the car battery.

9. The vehicle-mounted refrigerator drive circuit according to claim 3, characterized in that, The voltage regulator circuit includes a Zener diode, the input terminal of which is connected to the positive terminal of the car battery, the input terminal of which is grounded through capacitor E1, the output terminal of which outputs the first voltage, and the output terminal of which is grounded through capacitor E4. The voltage regulator circuit includes a reverse connection protection circuit, which includes a reverse connection protection MOSFET. The reverse connection protection MOSFET is connected between the negative terminal of the car battery and ground, and is connected to the output terminal of the voltage regulator circuit through a resistor.

10. A vehicle-mounted refrigerator, characterized in that, The vehicle-mounted refrigerator includes the vehicle-mounted refrigerator drive circuit as described in any one of claims 1-9.

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