Charger system applied to motor home

Abstract

The charger system applied to the motor home comprises a DC-DC boost-buck circuit, an MCU control module, an LED display panel and an auxiliary power supply, the input end of the DC-DC boost-buck circuit is further connected with an input anti-reverse-flow circuit, and the output end of the DC-DC boost-buck circuit is connected with an output anti-reverse-flow circuit. The MCU control module is connected with an input anti-reverse circuit, an input anti-reverse detection circuit, an input VDC detection circuit, an input ADC detection circuit, an NCT detection circuit, an output ADC detection circuit, an output VDC detection circuit and a key detection circuit, and the MCU control module is respectively communicated with the input anti-reverse circuit, the DC-DC buck-boost circuit and the output anti-reverse circuit through circuits to form a main control circuit. According to the charger system applied to the motor home, independent power device current sampling can be realized, and voltage and current input and output during charging can be accurately monitored and controlled.

Description

Technical Field

[0001] The utility model relates to the field of chargers, and specifically to a charger system applied to a recreational vehicle (RV). Background Art

[0002] As one of the classifications of automobiles, RVs have been gradually popularized with the improvement of people's travel requirements. Various electrical appliances and storage batteries for powering the electrical appliances are arranged in the RV. With the development of energy storage power supplies, different users have higher and higher requirements for the functions and output powers of the storage batteries, and the capacity of the storage batteries is also getting larger and larger. There is a great demand for chargers with various input and output types. Therefore, it is necessary to propose a multifunctional 25A DC-DC charger system for RVs to solve the above problems. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a charger system applied to an RV to solve the technical problems in the background art.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions:

[0005] A charger system applied to an RV includes a DC-DC buck-boost circuit, an MCU control module, an LED display panel, and an auxiliary power supply. The input end of the DC-DC buck-boost circuit is also connected with an input reverse connection prevention circuit, and its output end is connected with an output reverse connection prevention circuit. The MCU control module is connected with an input reverse connection prevention circuit, an input reverse connection detection circuit, an input VDC detection circuit, an input ADC detection circuit, an NCT detection circuit, an output ADC detection circuit, an output VDC detection circuit, and a key detection circuit. The MCU control module is respectively connected with the input reverse connection prevention circuit, the DC-DC buck-boost circuit, and the output reverse connection prevention circuit through circuits to form a main control circuit. The MCU control module controls the current acquisition of the power components of the DC-DC buck-boost circuit through connection, and feeds the voltage signal of the power component current acquisition back to the circuit in the MCU control module to control the input and output current. The external power supply is sequentially connected to the storage battery of the RV for charging through the input reverse connection prevention circuit, the DC-DC buck-boost circuit, and the output reverse connection prevention circuit.

[0006] The input reverse connection prevention circuit includes an ALT input reverse connection prevention circuit and a solar input reverse connection prevention circuit.

[0007] A first resistance element is also connected in series between the input reverse connection prevention circuit and the DC-DC buck-boost circuit for current sampling of the input current and detecting the input voltage to calculate the line loss compensation; a second resistance element is connected in series between the DC-DC buck-boost circuit and the output reverse connection prevention circuit for detecting the output current.

[0008] A button is installed on the key detection circuit for selecting charging of different types of storage batteries.

[0009] The external power supply is a 12V automotive battery, a 24V automotive battery, or a solar panel.

[0010] Compared with the prior art, a charger system applied to a motorhome in this application has a scientific control method, can realize individual current sampling of power devices, and accurately monitor and control the voltage, current input and output during charging. In addition, by detecting ADC / VDC / key / reverse connection / NTC signals of the input and output through the MCU control module, various states of the power supply and MPPT tracking can be detected in real time. It can intelligently judge the input voltage type, intelligent temperature rise control, constant voltage temperature compensation for external temperature, and input line loss compensation, so as to achieve charging and protection. This charging system has the advantages of high efficiency, strong versatility, and high dynamic and steady-state performance indicators. Description of the Drawings

[0011] Figure 1 : Composition framework diagram of this application;

[0012] Figure 2 : Circuit structure block diagram of the MCU control module;

[0013] Figure 3 : Circuit structure block diagram of the auxiliary power supply;

[0014] Figure 4 : Circuit structure block diagram of the DC-DC buck-boost circuit. Detailed Embodiments

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention.

[0016] Specific Embodiment 1: Please refer to Figures 1 to 4, in the embodiment of the present utility model, a charger system applied to a motorhome includes a DC-DC buck-boost circuit, an MCU control module, an LED display panel, and an auxiliary power supply. The input end of the DC-DC buck-boost circuit is also connected with an input reverse connection prevention circuit, and its output end is connected with an output reverse connection prevention circuit. The MCU control module is connected with an input reverse connection prevention circuit, an input reverse connection detection circuit, an input VDC detection circuit, an input ADC detection circuit, an NCT detection circuit, an output ADC detection circuit, an output VDC detection circuit, and a key detection circuit. The MCU control module forms a main control circuit by being connected to the input reverse connection prevention circuit, the DC-DC buck-boost circuit, and the output reverse connection prevention circuit through circuits respectively. The MCU control module controls the current acquisition of the power components of the DC-DC buck-boost circuit through connection, and feeds back the power component current acquisition voltage signal to the circuit in the MCU control module to control the input and output current. The external power supply is connected to the storage battery of the motorhome for charging after passing through the input reverse connection prevention circuit, the DC-DC buck-boost circuit, and the output reverse connection prevention circuit in sequence.

[0017] In this application, the DC-DC buck-boost circuit uses a buck-boost controller with the model number ISL81601. This buck-boost controller can detect the peak current at both ends, and can provide bidirectional per-cycle current limiting in buck or boost mode. It can independently collect input and output currents and design the main circuit parameters. The main circuit parameters mainly include independent acquisition circuit parameters and external PWM control current parameters. The MCU control module can calculate MPPT using an algorithm, and realize MPPT tracking by sampling the input and output voltage and current and adjusting the input current through PWM.

[0018] The auxiliary power supply set in this application is connected to the input and output circuits to provide power for the circuits, and the auxiliary power supply can also realize power-on and startup. If not charging, it enters the standby mode to realize the low-power operation of the charger.

[0019] The input reverse connection prevention circuit includes an ALT input reverse connection prevention circuit and a solar input reverse connection prevention circuit. The two input reverse connection prevention circuits, the DC-DC buck-boost circuit, the output reverse connection prevention circuit, the ADC / VDC detection circuit, the reverse connection detection circuit, and the key LED circuit are sequentially analyzed and controlled by the MCU control module through the connection circuit, and are displayed on the external LED display module through communication transmission.

[0020] A first resistor element is also connected in series between the input reverse connection prevention circuit and the DC-DC buck-boost circuit to sample the input current and detect the input voltage to calculate the line loss compensation. A second resistor element is connected in series between the DC-DC buck-boost circuit and the output reverse connection prevention circuit to detect the output current.

[0021] A button is installed on the key detection circuit for charging selection of different types of storage batteries. That is, the battery type can be selected through the button to achieve charging of multiple batteries such as lead-acid and lithium iron phosphate batteries. The charging system has strong versatility.

[0022] The external power supply is a 12V vehicle battery, a 24V vehicle battery or a solar panel.

[0023] Compared with the prior art, a charger system for a motorhome according to the present application has a scientific control method, can realize individual current sampling of power devices, and accurately monitor and control the voltage, current input and output during charging. In addition, by detecting the ADC / VDC / key / reverse connection / NTC signals of the input and output through the MCU control module, various states of the power supply and MPPT tracking can be detected in real time. It can intelligently judge the input voltage type, intelligent temperature rise control, constant voltage temperature compensation for the external temperature, and input line loss compensation, so as to achieve charging and protection. The charging system has the advantages of high efficiency, strong versatility, and high dynamic and steady-state performance indicators, and provides more flexible function adaptation options for most motorhomes on the market to a certain extent.

[0024] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the foregoing exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the foregoing description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0025] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A charger system applied to a recreational vehicle, characterized in that: It includes a DC-DC buck-boost circuit, an MCU control module, an LED display panel, and an auxiliary power supply. The input end of the DC-DC buck-boost circuit is also connected with an input reverse connection prevention circuit, and its output end is connected with an output reverse connection prevention circuit. The MCU control module is connected with an input reverse connection prevention circuit, an input reverse connection detection circuit, an input VDC detection circuit, an input ADC detection circuit, an NCT detection circuit, an output ADC detection circuit, an output VDC detection circuit, and a key detection circuit. The MCU control module forms a main control circuit by being connected to the input reverse connection prevention circuit, the DC-DC buck-boost circuit, and the output reverse connection prevention circuit through circuits respectively. The MCU control module controls the current acquisition of the power components of the DC-DC buck-boost circuit through connection, and feeds back the power component current acquisition voltage signal to the circuit in the MCU control module to control the input and output current. The external power supply is sequentially connected to the battery of the RV for charging through the input reverse connection prevention circuit, the DC-DC buck-boost circuit, and the output reverse connection prevention circuit.

2. The charger system for a recreational vehicle according to claim 1, wherein: The input reverse connection prevention circuit includes an ALT input reverse connection prevention circuit and a solar input reverse connection prevention circuit.

3. The charger system for a motorhome according to claim 2, wherein: A first resistor element is also connected in series between the input reverse connection prevention circuit and the DC-DC buck-boost circuit as a current sampling input current and a detection input voltage for calculating line loss compensation; a second resistor element is connected in series between the DC-DC buck-boost circuit and the output reverse connection prevention circuit for detecting the output current.

4. The charger system for a motorhome according to claim 3, characterized in that: A button is installed on the key detection circuit for selecting different types of batteries for charging.

5. The charger system for a recreational vehicle according to claim 4, wherein: The external power supply is a 12V vehicle battery, a 24V vehicle battery, or a solar panel.

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