Control device and equipment for low-voltage load electric appliance

Abstract

The embodiment of the utility model discloses a control device and equipment for a low-voltage load electric appliance. The control device comprises a power supply unit, a control unit and an electronic switch unit, the output of the power supply unit is connected with the control unit, and the power supply unit is used for supplying power to the control unit; the output of the control unit is connected with the input of the electronic switch unit, and the control unit is used for sending a control signal for controlling a low-voltage load electric appliance to the electronic switch unit; and the output of the electronic switch unit is connected with the low-voltage load electric appliance, and the electronic switch unit is used for controlling the low-voltage load electric appliance based on the control signal.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, and in particular to a control device and equipment for low-voltage load electrical appliances. Background Art

[0002] In the automotive domain, the control of low-voltage load electrical appliances usually uses the car's power battery to power the storage battery, which then distributes power to the low-voltage relay, which controls the low-voltage load electrical appliances.

[0003] On the one hand, the presence of relays, connectors and wires increases the difficulty of hardware layout, installation and maintenance in the car. At the same time, longer wiring increases line losses, thereby increasing the energy consumption of the car.

[0004] On the other hand, relays used as switches to control low-voltage load electrical appliances are prone to repeated jumping during switching, which causes a time delay in the switching action and reduces the response efficiency.

[0005] In summary, the current low-voltage load electrical control process in automobiles consumes high energy and has low response efficiency. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a control device and equipment for low-voltage load electrical appliances, which have the characteristics of low energy consumption and high response efficiency when controlling low-voltage load electrical appliances.

[0007] The solution of the utility model is implemented as follows: the utility model provides a control device for a low-voltage load electrical appliance, the control device for the low-voltage load electrical appliance comprises: a power supply unit, a control unit and an electronic switch unit;

[0008] The outputs of the power supply units are respectively connected to the control units, and the power supply units are used to supply power to the control units;

[0009] The output of the control unit is connected to the input of the electronic switch unit, and the control unit is used to send a control signal for controlling the low-voltage load electrical appliance to the electronic switch unit;

[0010] The output of the electronic switch unit is connected to the low-voltage load electrical appliance, and the electronic switch unit is used to control the low-voltage load electrical appliance based on the control signal.

[0011] In some embodiments, the electronic switch unit includes at least one electronic switch; when the second switch module includes multiple electronic switches, the multiple electronic switches are connected in parallel; wherein the current of the multiple electronic switches connected in parallel matches the power of the low-voltage load electrical appliance.

[0012] In some embodiments, the electronic switch is a metal oxide semiconductor field effect transistor or an insulated gate bipolar transistor.

[0013] In some embodiments, the device further comprises a first switch; a first pole of the first switch is connected to a first pole of the electronic switch unit, and a second pole of the first switch is connected to an output of the power supply unit;

[0014] The third pole of the first switch is used to receive the control signal; the first switch is used to turn on or off the electronic switch unit based on the control signal.

[0015] In some embodiments, the device also includes a first filtering unit, the first filtering unit includes a first resistor and a first capacitor, the first end of the first resistor is connected to the control signal, the second end of the first resistor is respectively connected to the third pole of the first switch and the first capacitor, and the other end of the first capacitor is connected to the ground.

[0016] In some embodiments, the device also includes a second filtering unit, which includes a second resistor, a third resistor and a second capacitor; one end of the second resistor is connected to the first pole of the first switch, and the other end of the second resistor is respectively connected to one end of the second capacitor, one end of the third resistor and the first pole of the electronic switch unit, and the other end of the second capacitor and the other end of the third resistor are respectively connected to the ground.

[0017] In some embodiments, the device further comprises a protection unit;

[0018] The protection unit includes a fourth resistor and a diode; one end of the fourth resistor is connected to the second pole of the electronic switch unit, the third pole of the electronic switch unit is connected to the ground, the other end of the fourth resistor is respectively connected to the positive pole of the diode and the negative pole of the low-voltage load electrical appliance, the negative pole of the diode is connected to the positive pole of the low-voltage load electrical appliance, and the positive pole of the low-voltage load electrical appliance is connected to the output of the power supply unit.

[0019] In some embodiments, the power supply unit includes: an inverter unit and a battery;

[0020] The inverter unit is connected to the battery, and is used to convert the first voltage output by the power battery into a second voltage and then supply power to the control unit; wherein the second voltage is the required voltage of the low-voltage load electrical appliance;

[0021] The storage battery receives the second voltage output by the inverter unit.

[0022] In some embodiments, the apparatus further includes a communication unit, which is connected to the control unit and is used to receive a communication signal sent by the first device for controlling the low-voltage load electrical appliance, and send the communication signal to the control unit.

[0023] The utility model also provides a vehicle device, which comprises any one of the above-mentioned control devices for low-voltage load electrical appliances.

[0024] The control device for the low-voltage load electrical appliance provided by the utility model includes: a power supply unit, a control unit and an electronic switch unit; the output of the power supply unit is respectively connected to the control unit, and the power supply unit is used to supply power to the control unit; the output of the control unit is connected to the input of the electronic switch unit, and the control unit is used to send the control signal for controlling the low-voltage load electrical appliance to the electronic switch unit; the output of the electronic switch unit is connected to the low-voltage load electrical appliance, and the electronic switch unit is used to control the low-voltage load electrical appliance based on the control signal.

[0025] It can be seen that: for the solution of the utility model, on the one hand, the power supply unit, the control unit and the electronic switch unit are integrated into one device, which shortens the wiring between the units, improves the utilization rate of the layout, and reduces the line loss; on the other hand, the electronic switch unit adopts an electronic switch, which has low energy consumption, low failure rate and fast response speed, effectively reduces energy consumption, and at the same time improves the stability and response efficiency of the switching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a first optional structure of a control device for a low-voltage load electrical appliance provided in an embodiment of the utility model;

[0027] Figure 2 A second optional structural diagram of the control device for low-voltage load electrical appliances provided in an embodiment of the utility model;

[0028] Figure 3 A third optional structural diagram of the control device for low-voltage load electrical appliances provided in an embodiment of the utility model;

[0029] Figure 4 A fourth optional structural diagram of the control device for low-voltage load electrical appliances provided by an embodiment of the utility model;

[0030] Figure 5 A fifth optional structural diagram of the control device for low-voltage load electrical appliances provided in an embodiment of the utility model;

[0031] Figure 6A sixth optional structural diagram of the control device for low-voltage load electrical appliances provided in an embodiment of the utility model;

[0032] Figure 7 A seventh optional structural diagram of the control device for low-voltage load electrical appliances provided in an embodiment of the utility model;

[0033] Figure 8 An eighth optional structural diagram of the control device for low-voltage load electrical appliances provided by an embodiment of the utility model;

[0034] Fig. 9 A ninth optional structural diagram of a control device for a low-voltage load electrical appliance provided in an embodiment of the utility model;

[0035] Fig.10 A schematic diagram of an optional structure of a windshield heating device provided in an embodiment of the utility model;

[0036] Fig.11 An optional circuit diagram of a switch tube circuit in a windshield heating device provided by an embodiment of the utility model;

[0037] Fig.12 A schematic diagram of an optional flow chart of a method for heating a windshield provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the specific technical solution of the application will be further described in detail below in conjunction with the drawings in the embodiment of the utility model. The following embodiments are used to illustrate the utility model, but are not used to limit the scope of the utility model.

[0039] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0040] In the following description, the terms "first\second\third" are used only as examples to distinguish different objects, and do not represent a specific order for the objects, nor do they have a limitation on the order of precedence. It is understandable that the specific order or order of "first\second\third" can be interchanged where permitted, so that the embodiments of the utility model described herein can be implemented in an order other than that illustrated or described herein.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the field of the present invention. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0042] Next, various embodiments of the control device for low-voltage load electrical appliances and vehicle equipment provided by the embodiments of the utility model are described.

[0043] In a first aspect, the utility model provides a control device for a low-voltage load electrical appliance.

[0044] Figure 1 A schematic diagram of a control device for a low-voltage load electrical appliance provided by an embodiment of the utility model is shown in FIG. Figure 1 As shown, the control device 10 of the low-voltage load electrical appliance includes a power supply unit 101, a control unit 102, and an electronic switch unit 103;

[0045] The output of the power supply unit 101 is respectively connected to the control unit 102, and the power supply unit 101 is used to supply power to the control unit 102;

[0046] The output of the control unit 102 is connected to the input of the electronic switch unit 103, and the control unit 102 is used to send a control signal to the electronic switch unit 103;

[0047] The output of the electronic switch unit is connected to the low-voltage load electrical appliance 30 , and the electronic switch unit 103 is used to control the low-voltage load electrical appliance 30 based on the control signal.

[0048] The utility model does not specifically limit the electrical connection mode between the units (between the power supply unit 101 and the control unit 102, and between the control unit 102 and the electronic switch unit 103), which can be configured according to actual conditions.

[0049] For power supply unit 101:

[0050] The power supply unit 101 is used to supply power to the control unit 102;

[0051] It should be noted that the output of the power supply unit 101 can be obtained by inverting and reducing the voltage of the power battery 20, or can be stored in the battery 1012 after inverting and reducing the voltage of the power battery 20. When the power system fails, the battery 1012 supplies power to the control unit 102. At this time, the battery 1012 is used for backup power supply. The specific type of the power supply unit 101 is not limited in the embodiment of the present application, and can be configured according to actual conditions.

[0052] The embodiment of the present application does not specifically limit the low-voltage load electrical appliance 30, and it can be configured based on actual conditions.

[0053] Exemplarily, the low-voltage load electrical appliance 30 may be a low-voltage high-power electrical appliance.

[0054] For the control unit 102:

[0055] The control unit 102 is used to send a control signal to the electronic switch unit 103 .

[0056] It should be noted that the control unit 102 is also connected to the communication unit 108, receives the communication signal of the communication unit, converts the communication signal into a control signal and sends it to the electronic switch unit.

[0057] Exemplarily, the control signal may be a digital pulse signal, a switch signal, or a pulse width modulation signal. The embodiment of the present application does not limit the specific type of the control signal and may be configured according to actual conditions.

[0058] The control signal can be used to open, close, and adjust low-voltage load electrical appliances.

[0059] The control signal is sent to the electronic switch unit 103. For example, the control signal can be transmitted in serial or in parallel. The embodiment of the present application does not limit the transmission method of the control signal and can be configured according to actual conditions.

[0060] For the electronic switch unit 103:

[0061] The electronic switch unit 103 controls the low-voltage load electrical appliance 30 based on the control signal. Example 1: The electronic switch unit 103 includes an electronic switch, and the connection and disconnection of the electronic switch are controlled based on the control signal. When the electronic switch is connected, the power supply unit 101 supplies power to the low-voltage load electrical appliance 30, so that the low-voltage load electrical appliance 30 can work normally;

[0062] Example 2: When the electronic switch is turned off, the power supply unit 101 stops supplying power to the low-voltage load electrical appliance 30 , so as to shut down the operation of the low-voltage load electrical appliance 30 .

[0063] Example 3: When the heating gear of the windshield needs to be adjusted, the electronic switch can also be used to adjust the gear, that is, the gear adjustment is achieved by changing the number of electronic switches in parallel.

[0064] The windshield heating device provided by the utility model includes: a power supply unit 101, a control unit 102 and an electronic switch unit; the output of the power supply unit 101 is respectively connected to the control unit 102, and the power supply unit 101 is used to supply power to the control unit 102; the output of the control unit 102 is connected to the input of the electronic switch unit, and the control unit 102 is used to send the control signal for controlling the low-voltage load electrical appliance 30 to the electronic switch unit; the output of the electronic switch unit is connected to the low-voltage load electrical appliance 30, and the electronic switch unit is used to control the low-voltage load electrical appliance 30 based on the control signal.

[0065] It can be seen that: for the solution of the utility model, on the one hand, the power supply unit 101, the control unit 102 and the electronic switch unit are integrated into one device, which shortens the wiring between the units, improves the utilization rate of the layout, and reduces the line loss; on the other hand, the electronic switch unit adopts an electronic switch, which has low energy consumption, low failure rate and fast response speed, effectively reduces energy consumption, and at the same time improves the stability and response efficiency of the switching process.

[0066] The electronic switch unit 103 is described in detail below.

[0067] like Figure 2 As shown, the electronic switch unit 103 includes at least one electronic switch, for example, an electronic switch 1031 , an electronic switch 1032 to an electronic switch 103n.

[0068] It should be noted that the electronic switch unit 103 may have only one electronic switch or may include multiple electronic switches. The number of electronic switches in the electronic switch unit 103 may be configured based on the power required by the low-voltage load electrical appliance 30. When the power required by the low-voltage load electrical appliance 30 is high, multiple electronic switches may be configured in the electronic switch unit 103 to increase the current, thereby meeting the power required by the low-voltage load electrical appliance 30.

[0069] In a possible implementation, the electronic switch unit 103 includes a plurality of electronic switches, which are connected in parallel; wherein the current of the plurality of electronic switches connected in parallel matches the power of the low-voltage load electrical device 30 .

[0070] Exemplarily, the electronic switch unit 103 includes three electronic switches connected in parallel. When the electronic switches are turned on, the current of the circuit where each electronic switch is located is 20A. After the three electronic switches are connected in parallel, the output current is 60A.

[0071] The electronic switch in the embodiment of the present application is described in detail below.

[0072] The electronic switch is a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT).

[0073] It should be noted that, when used as electronic switches, MOSFET and IGBT can both realize the on and off of the electronic switches based on the control signals of the electronic switches, thereby controlling the on and off of the current and the working state of the circuit.

[0074] It should be noted that one end of the electronic switch is used to receive a control voltage, and when the control voltage meets a turn-on threshold of the electronic switch, the other two ends of the electronic switch are turned on.

[0075] The specific type of the electronic switch is not limited in the present application embodiment and can be configured according to actual conditions. For example, the electronic switch is a MOSFET, and the on-off between the drain and source of the MOSFET is controlled by applying a control voltage to the gate of the MOSFET.

[0076] Among them, the MOSFET can be an enhancement mode MOSFET or a depletion mode MOSFET, and the IGBT can be a low voltage IGBT, a medium voltage IGBT or a high voltage IGBT.

[0077] It should be noted that MOSFET and IGBT differ in device structure, performance parameters, switching speed and loss, and the type of electronic switch can be selected according to usage requirements.

[0078] It can be seen that: using an electronic switch as a driving control switch for powering low-voltage load electrical appliances, on the one hand, because the electronic switch has low energy consumption, fast response, and simple lines required for power distribution, it improves the stability and response efficiency of the control process and reduces the energy consumption of the circuit where the low-voltage load electrical appliances are located; on the other hand, the electronic switch is small in size, and the electronic switch unit where the electronic switch is located is integrated with the power supply unit, control unit, etc., which reduces the line loss caused by long wiring, thereby effectively reducing energy consumption.

[0079] like Figure 3 As shown, the embodiment of the present application also includes a first switch 104;

[0080] The third pole of the first switch 104 is connected to the first pole of the electronic switch unit 103, and the second pole of the first switch 104 is connected to the output of the power supply unit 101; the first pole of the first switch 104 is used to receive a control signal; the first switch 104 is used to turn on or off the electronic switch unit based on the control signal.

[0081] Exemplarily, the first switch 104 may be a transistor, or a MOSFET or an IGBT. The embodiment of the present application does not limit the specific type of the electronic switch, and it may be configured according to actual conditions.

[0082] It should be noted that when the first pole of the first switch 104 receives a control signal from the control unit 102, the second pole and the third pole of the first switch 104 are turned on, that is, the power supply unit 101 is connected to the electronic switch unit 103 after filtering, providing a switch control signal to the electronic switch unit 103.

[0083] Exemplarily, the first switch may be a semiconductor triode, wherein the first electrode is a collector, the second electrode is an emitter, and the third electrode is a base.

[0084] Exemplarily, the electronic switch in the electronic switch unit may be a MOSFET, wherein the first electrode of the electronic switch is a gate electrode, the second electrode is a drain electrode, and the third electrode is a source electrode.

[0085] It can be seen that the first switch provides a control voltage to the electronic switch in the electronic switch unit according to the control signal of the control unit, thereby driving the electronic switch. By using a triode as a driving element, the circuit design can be simplified, the complexity of the circuit can be reduced, and the reliability and stability of the circuit can be improved.

[0086] like Figure 4 As shown, the embodiment of the present application also includes a first filtering unit.

[0087] The first filtering unit includes a first resistor 1051 and a first capacitor 1052, wherein the first end of the first resistor 1051 is connected to the control signal, and the second end of the first resistor 1051 is connected to the first pole of the first switch 104; the other end of the first resistor 1051 is connected to the first capacitor 1052, and the other end of the first capacitor 1052 is connected to the ground.

[0088] It should be noted that the control signal of the control unit 102 is filtered by the first filtering unit, and the filtered control signal is transmitted to the first switch 104 .

[0089] Exemplarily, the first filtering unit may be an RC filter or an LC filter. The embodiment of the present application does not limit the specific filtering type of the first filtering unit and may be configured according to actual conditions.

[0090] It should be noted that, in practice, since the control signal may carry high-frequency interference signals, filtering is required. By denoising the control signal to meet specific signal processing, signal processing and optimization can be achieved, and the switching circuit can be driven more accurately, thereby improving the reliability of the circuit where the low-voltage load electrical appliance is located.

[0091] like Figure 5 As shown, the embodiment of the present application also includes a second filtering unit 106, and the second filtering unit includes a second resistor 1061, a third resistor 102 and a second capacitor 1063; one end of the second resistor 1061 is connected to the third pole of the first switch 104, and the other end of the second resistor 1061 is respectively connected to one end of the second capacitor 1063, one end of the third resistor 102 and the first pole of the electronic switch unit, and the other end of the second capacitor 1063 and the other end of the third resistor 102 are respectively connected to the ground.

[0092] It should be noted that when the first switch 104 is connected, the output of the power supply unit 101 is connected to the second filtering unit 106, and the second filtering unit 106 is connected to filter the output voltage of the power supply unit 101, and sends the filtered voltage to the electronic switch unit 103 to drive the electronic switch in the electronic switch unit 103.

[0093] Exemplarily, the second filtering unit 106 may be an RC filter or an LC filter. The embodiment of the present application does not limit the specific filtering type of the second filtering unit 106 and may be configured according to actual conditions.

[0094] It should be noted that, in practice, the output from the power supply unit 101 may carry noise signals or high-frequency interference signals, so filtering is required. By filtering out the power supply noise signals or high-frequency interference signals, the power supply can be optimized and the electronic switch in the switch unit can be driven more accurately, thereby improving the reliability of the circuit where the low-voltage load electrical appliance is located.

[0095] like Figure 6 As shown, the embodiment of the present application also includes a protection unit 107, and the protection unit 107 includes a fourth resistor 1071 and a diode 1072; one end of the fourth resistor 1071 is connected to the second pole of the electronic switch unit, and the third pole of the electronic switch unit is connected to the ground terminal, and the other end of the fourth resistor 1071 is respectively connected to the positive pole of the diode 1072 and the negative pole of the low-voltage load electrical appliance 30, the negative pole of the diode 1072 is connected to the positive pole of the low-voltage load electrical appliance 30, the positive pole of the low-voltage load electrical appliance 30 is connected to the output of the power supply unit 101, and the negative pole of the diode 1072 in the protection unit 107 is connected to the power supply unit 101.

[0096] It should be noted that the protection unit 107 is used for the electronic switch in the electronic switch unit 103. When the electronic switch is disconnected, a transient excess voltage will be generated to impact the electronic switch. The loop formed by the diode 1072 and the resistor provides a path for the transient excess current, thereby preventing the internal electronic switch from being broken down by the excess voltage or being overheated and burned by the excess current, thereby protecting the electronic switch.

[0097] Exemplarily, the diode 1072 may be a transient voltage suppression diode 1072 (TVS diode 1072 ), and the power of the diode 1072 and the resistor may be configured according to the power required by the low-voltage load electrical appliance 30 , which is not limited in the embodiment of the present application.

[0098] The power supply unit 101 in the embodiment of the present application is described in detail below.

[0099] like Figure 7 As shown, the power supply unit 101 includes: an inverter unit 1011 and a battery 1012;

[0100] The inverter unit 1011 is connected to the battery 1012, and the inverter unit 1011 is used to convert the first voltage output by the power battery 20 into a second voltage and then supply power to the control unit 102 and the battery 1012; wherein the second voltage is the required voltage of the low-voltage load electrical appliance 30, and the battery 1012 is a backup power supply device.

[0101] It should be noted that the power battery 20 usually outputs a high voltage power supply, and the inverter unit 1011 converts the first voltage (high voltage) output by the power battery 20 into a second voltage (low voltage).

[0102] It should be noted that the low-voltage DC power source output by the inverter unit 1011 supplies power to the low-voltage load electrical appliance 30 .

[0103] It should be noted that the voltage output by the inverter unit 1011 is configurable, and can be 12V, 24V or 48V, depending on the configuration required by the low-voltage load electrical appliance 30 .

[0104] like Figure 8 As shown, the embodiment of the present application also includes a communication unit 108, which is connected to the control unit 102, and the communication unit 108 is used to receive the communication signal sent by the first device 40 and send the communication signal to the control unit 102.

[0105] It should be noted that when the low-voltage load electrical appliance 30 needs to be powered, the input signal requesting power supply is sent to the communication unit 108 through the first device 40, transmitted to the control unit 102 through the communication unit 108, and then the control unit 102 controls the opening of the electronic switch unit 103, thereby realizing power supply to the low-voltage load electrical appliance 30.

[0106] It should be noted that the first device 40 can be a physical button or software. The embodiment of the present application does not limit the specific type of the first device 40 and can be configured according to actual conditions.

[0107] like Fig. 9 As shown, the embodiments of the present application include all the contents of the above embodiments.

[0108] Next, the control device for the low-voltage load electrical appliance provided by the present invention is described by taking the low-voltage load electrical appliance being a heating wire of a windshield as an example.

[0109] In the automotive field, in some countries where the ambient temperature is extremely low, the ice on the windshield of electric vehicles seriously affects the use of the vehicle by users. Some electric vehicles use the defrosting function of the air conditioner to de-ice the windshield. Some electric vehicles use electric heating to power the heating wire with a low-voltage battery, and add a heating soft switch to the vehicle computer or a hard switch to the instrument interior panel. The heating wire is driven by a low-voltage relay to de-ice the windshield by heating the heating wire.

[0110] For the windshield de-icing by using the defrosting function of the air conditioner, the defrosting time is long and the power consumption is high; for electric vehicles, the windshield de-icing is achieved by electric heating. Due to the large heating power demand, on the one hand, it is necessary to add relays, connectors and additional wires, which increases the difficulty of hardware layout, installation and maintenance in the car, and increases the energy consumption of the car. On the other hand, the relay is used as a switch to control the heating wire of the windshield. The relay is prone to repeated jumping when the switch is in action, which causes a time delay in the switch action and reduces the response efficiency.

[0111] In view of the above problems, the utility model discloses a control device for automobile windshield heating, which replaces the traditional relay with an electronic switch, and integrates the power supply unit, control unit and electronic switch unit required by the control device for automobile windshield heating into one device. The power supply unit supplies power to the load, and the control unit controls the switching action in the electronic switch unit to achieve heating of the load.

[0112] The purpose of the utility model is to overcome the problems of high energy consumption and slow response in the existing automobile windshield deicing. The control device for automobile windshield heating of the utility model integrates the power supply unit, the control unit and the electronic switch unit in one device, shortens the wiring between the units, improves the utilization rate of the layout, and reduces line loss; at the same time, the electronic switch unit adopts an electronic switch, which has low energy consumption, low failure rate and fast response speed, effectively reduces energy consumption and improves the stability and response efficiency of the switching process.

[0113] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0114] When the car windshield needs to be heated, the heating request signal of the car windshield is transmitted to the communication circuit of the car (equivalent to the above-mentioned communication unit). After receiving the request signal from the communication circuit, the control circuit of the device (equivalent to the above-mentioned control unit) converts the request signal into a heating request control signal. The control signal enters the switch tube circuit of the device (equivalent to the above-mentioned electronic switch unit) to control the connection of the electronic switch. At the same time, after the power supply unit of the device is stepped down by the inverter circuit (equivalent to the above-mentioned power supply unit), the power supply electronic switch of the heating wire of the windshield (equivalent to the above-mentioned low-power electrical appliance) is connected to the heating wire. When the electronic switch is controlled to be connected, the heating wire of the windshield is powered, and the heat generated by the heating wire is used to de-ice the windshield glass.

[0115] When the car windshield needs to be heated, the user can make a request through the car computer button or the car software, and the request signal is transmitted to the control circuit after passing through the communication circuit.

[0116] The heating device for the windshield of the utility model is as follows Fig.10 As shown, including:

[0117] Inverter circuit 1001 , control circuit 1002 , communication circuit 1003 , switch tube circuit 1004 .

[0118] The circuit of the switch tube circuit 1004 of the present invention is as follows: Fig.11 As shown, including:

[0119] Resistor R1, resistor R2, resistor R3 and resistor R4; capacitors C1 and C2; transistors NPN1, MOSFET1, MOSFET2 and MOSFET3; diode D1.

[0120] The inverter circuit 1001 in this embodiment is used to reduce the voltage of the power battery of the vehicle, and obtain a 12V low-voltage DC power supply to power the transistor NPN1 and the heating wire 1005 in the switch tube circuit 1004 .

[0121] The rated working voltage of the heating wire 1005 is 12V and the rated working power is 800W.

[0122] In this embodiment, the control circuit 1002 is used to receive the communication signal of the communication circuit and convert it into the control signal required by the switch tube circuit 1004.

[0123] The switch tube circuit 1004 in this embodiment is used to control the on and off of the electronic switch based on the control signal of the control circuit 1002 , thereby controlling the heating of the heating wire 1005 .

[0124] The switch tube circuit 1004 includes a first-stage filter circuit, a transistor, a second-stage filter circuit and three parallel-connected MOSFETs.

[0125] It should be noted that, since the rated working voltage required by the heating wire 1005 is 12V and the rated working power is 800W, the rated current required by the heating wire 1005 needs to be greater than 67A. The rated voltage of the selected MOSFET is 50V and the rated current is 25A. Therefore, the rated current of 75A is achieved by connecting three MOSFETs in parallel, which meets the rated current required by the heating wire 1005.

[0126] The first-stage filtering circuit is composed of a resistor R1 and a capacitor C1, and is used to filter noise from the control signal.

[0127] The output of the first filtering circuit is connected to the base of the transistor, the emitter of the transistor is connected to the output (12V) of the inverter circuit 1001, and the collector of the transistor is connected to the second-stage filtering circuit.

[0128] The second-stage filtering circuit is composed of a resistor R2, a resistor R3 and a capacitor C2, and is used to filter the noise of the 12V power supply of the transistor when the transistor is turned on.

[0129] The gates of the three parallel-connected MOSFETs are all connected to the output of the second-stage filter circuit, the sources are all connected to the ground, and the drains are all connected to the resistor R4.

[0130] The resistor R4 and the diode D1 form a protection circuit, which provides a leakage loop for the transient high current generated when the MOSFET is turned off, thereby protecting the MOSFET from breakdown due to the transient high voltage or overheating and burning due to the transient high current.

[0131] The specific windshield heating process can be referred to Fig.12 As shown in the content, the heating process of the windshield may include but is not limited to the following S1201 to S1207.

[0132] S1201, receiving request information for heating the windshield requested by a vehicle computer button or vehicle-mounted software, and transmitting the request information to a communication circuit of a windshield heating device.

[0133] S1202: The communication circuit transmits the heating request information to the control circuit.

[0134] S1203, the control circuit converts the communication signal into a control signal, and transmits it to the first filter circuit in the switch tube circuit for filtering.

[0135] S1204, the filtered control signal controls the transistor to be turned on. When the transistor is turned on, the transistor connects the 12V power provided by the inverter unit to the second filter unit.

[0136] S1205 , the second filtering unit filters the 12V power provided by the inverter unit and transmits the filtered power to the MOSFET as a control voltage of the MOSFET.

[0137] S1206. When the MOSFET receives the control voltage, the MOSFET is turned on, connecting the circuit where the heating wire is located, and the heating wire is heated when the inverter unit supplies power.

[0138] In a second aspect, the utility model provides a vehicle device, which includes any one of the above-mentioned control devices for low-voltage load electrical appliances.

[0139] It should be noted that the technical effect achieved by the vehicle equipment is consistent with the control of the above-mentioned low-voltage load electrical appliances. For details, please refer to the detailed description of the technical effect of the control device of the above-mentioned low-voltage load electrical appliances, which will not be repeated here.

[0140] It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the utility model. Therefore, "in one embodiment" or "in some embodiments" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the utility model, the size of the serial number of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the utility model. The serial numbers of the above-mentioned embodiments of the utility model are only for description and do not represent the advantages and disadvantages of the embodiments.

[0141] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0142] In the several embodiments provided by the present utility model, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0143] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0144] In addition, all functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be a separate unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0145] A person skilled in the art can understand that all or part of the steps of implementing the above method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiment; and the aforementioned storage medium includes: mobile storage devices, read-only memories (ROM), magnetic disks or optical disks, etc., various media that can store program codes.

[0146] Alternatively, if the above-mentioned integrated unit of the utility model is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the utility model can be essentially or in other words, the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in each embodiment of the utility model. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROMs, magnetic disks, or optical disks.

[0147] The above is only an implementation method of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A control device for a low-voltage load electrical appliance, characterized in that: The device comprises: a power supply unit, a control unit and an electronic switch unit; The outputs of the power supply units are respectively connected to the control units, and the power supply units are used to supply power to the control units; The output of the control unit is connected to the input of the electronic switch unit, and the control unit is used to send a control signal for controlling the low-voltage load electrical appliance to the electronic switch unit; The output of the electronic switch unit is connected to the low-voltage load electrical appliance, and the electronic switch unit is used to control the low-voltage load electrical appliance based on the control signal.

2. The device according to claim 1, characterized in that The electronic switch unit comprises at least one electronic switch; In the case where the electronic switch unit includes a plurality of electronic switches, the plurality of electronic switches are connected in parallel; wherein the current of the plurality of electronic switches connected in parallel matches the power of the low-voltage load electrical appliance.

3. The device according to claim 2, characterized in that The electronic switch is a metal oxide semiconductor field effect transistor or an insulated gate bipolar transistor.

4. The device according to claim 1, characterized in that The device further comprises a first switch; a first pole of the first switch is connected to a first pole of the electronic switch unit, and a second pole of the first switch is connected to an output of the power supply unit; The third pole of the first switch is used to receive the control signal; The first switch is used to turn on or off the electronic switch unit based on the control signal.

5. The device according to claim 4, characterized in that The device also includes a first filtering unit, which includes a first resistor and a first capacitor. The first end of the first resistor is used to access the control signal, the second end of the first resistor is respectively connected to the third pole of the first switch and the first capacitor, and the other end of the first capacitor is connected to the ground.

6. The device according to claim 4, characterized in that The device also includes a second filtering unit, which includes a second resistor, a third resistor and a second capacitor; one end of the second resistor is connected to the first pole of the first switch, and the other end of the second resistor is respectively connected to one end of the second capacitor, one end of the third resistor and the first pole of the electronic switch unit, and the other end of the second capacitor and the other end of the third resistor are respectively connected to the ground.

7. The device according to claim 1, characterized in that The device also includes a protection unit, which includes a fourth resistor and a diode; one end of the fourth resistor is connected to the second pole of the electronic switch unit, the third pole of the electronic switch unit is connected to the ground, the other end of the fourth resistor is respectively connected to the positive pole of the diode and the negative pole of the low-voltage load electrical appliance, the negative pole of the diode is connected to the positive pole of the low-voltage load electrical appliance, and the positive pole of the low-voltage load electrical appliance is connected to the output of the power supply unit.

8. The device according to claim 1, characterized in that The power supply unit includes: an inverter unit or a battery; The inverter unit is used to convert the first voltage output by the power battery into a second voltage and then supply power to the control unit; wherein the second voltage is the required voltage of the low-voltage load electrical appliance; or, The battery is used to supply power to the control unit.

9. The device according to claim 1, characterized in that The device further comprises a communication unit, which is connected to the control unit and is used to receive a communication signal sent by the first device for controlling the low-voltage load electrical appliance, and send the communication signal to the control unit.

10. A vehicle device, characterized in that: The vehicle equipment includes the control device for the low-voltage load electrical appliance according to any one of claims 1 to 9.

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