Motor home charging control circuit based on speed sensing

Abstract

The utility model discloses a motor home charging control circuit based on speed sensing, and the circuit comprises a solar power generation device which is used for generating power through a solar cell panel; the traveling power generation device is used for generating power when the motor home runs; an input switching circuit; the two DC / DC buck-boost circuits are respectively used for charging the driving battery and the life battery; the GPS module is used for collecting position and speed signals of the motor home; the main control unit is used for sending a switching instruction to the input switching circuit, controlling the charging power of the two DC / DC buck-boost circuits and obtaining the position and speed signals of the motor home from the GPS module, and the main control unit is further used for controlling the two DC / DC buck-boost circuits to charge the driving battery and the life battery at the same time when the speed of the motor home is higher than a preset value; and when the speed of the motor home is lower than a preset value, a DC / DC buck-boost circuit is controlled to charge a driving battery. According to the utility model, long-time high-power charging of the driving battery can be avoided, and the service life of the battery can be prolonged.

Description

Technical Field

[0001] The utility model relates to a charging control circuit, in particular to a charging control circuit for a recreational vehicle based on speed sensing. Background Art

[0002] RVs contain driving batteries and living batteries. The living battery charging process of traditional RVs is as follows: after the RV is started, the RV generator sends a signal that the RV has started. At this time, the driving charger starts, and according to the set generator voltage, the living battery is charged after starting. However, due to different RV configurations, the starting signal interface models are also diverse. To be compatible with different models of RVs and their generators, a more complex design is required. In addition, regarding the setting of the generator voltage for driving charging, the driving charger is generally set according to the voltage of the RV starting battery. After the RV is started, the living battery cannot be charged if the driving battery is not fully charged. This will cause the driving battery charging current to be the full current output by the generator. When the vehicle speed is high, due to the large power output, it is easy to cause damage to the driving battery. Under long-term charging conditions, it will directly affect the battery life. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a charging control circuit for RVs based on speed sensing, which can avoid long-term high-power charging of the driving battery and help to increase the battery life, in response to the shortcomings of the existing technology.

[0004] In order to solve the above technical problems, the present utility model adopts the following technical solutions.

[0005] A speed-sensing RV charging control circuit includes: a solar power generation device for generating electricity via solar panels; a driving power generation device for generating electricity while the RV is driving; an input switching circuit for switching its input end to connect to the output end of the solar power generation device or the output end of the driving power generation device according to a preset switching instruction; two DC / DC buck-boost circuits, each having an input end connected to the output end of the input switching circuit, the DC / DC buck-boost circuit for boosting or bucking the output voltage of the input switching circuit, the two DC / DC buck-boost circuits for charging a driving battery and a household battery, respectively; a GPS module for collecting position and speed signals of the RV; and a main control unit for issuing switching instructions to the input switching circuit, controlling the charging power of the two DC / DC buck-boost circuits, and obtaining the position and speed signals of the RV from the GPS module. The main control unit is configured to control the two DC / DC buck-boost circuits to simultaneously charge the driving battery and the household battery when the RV speed exceeds a preset value, and to control one DC / DC buck-boost circuit to charge the driving battery when the RV speed is below the preset value.

[0006] Preferably, a PWM adjustment circuit is connected between the DC / DC buck-boost circuit and the main control unit.

[0007] Preferably, the DC / DC buck-boost circuit includes a buck-boost chip U11 of model EG1151, and the main control unit includes a single-chip microcomputer U16 of model CH32V203C8T6.

[0008] Preferably, the PWM adjustment circuit includes a comparator U31.1, the non-inverting end of the comparator U31.1 is grounded through a resistor R81, the inverting end of the comparator U31.1 is connected to the single-chip microcomputer U16 through resistors R77 and R76 connected in series, a resistor R49 and a capacitor C85 connected in parallel are connected between the inverting end and the output end of the comparator U31.1, the output end of the comparator U31.1 is connected to the first control end IFB1+ of the buck-boost chip U11 through resistors R75 and R80 connected in series, and the second control end IFB1- of the buck-boost chip U11 is grounded through a resistor R79.

[0009] Preferably, a recreational vehicle start-up detection circuit is included, and the recreational vehicle start-up detection circuit is used to send a start-up signal to the main control unit when the recreational vehicle is started.

[0010] Preferably, an EMI circuit is included, and the EMI circuit is connected between the output end of the DC / DC buck-boost circuit and the driving battery.

[0011] Preferably, a battery temperature detection circuit is included, and the battery temperature detection circuit is used to collect the temperatures of the driving battery and the life battery and transmit them to the main control unit in the form of electrical signals.

[0012] In the speed-sensing RV charging control circuit disclosed in this utility model, the main control unit reads the position and speed signals collected by the GPS module. The main control unit compares and judges the position and speed signals with the set speed value, and starts charging the living battery in advance according to the driving speed, and promptly diverts the charging power supplied to the driving battery, thereby improving the driving battery charging power and charging environment, thereby preventing damage to the driving battery and increasing the service life of the driving battery, while also ensuring timely charging of the living battery. As can be seen, the utility model has the technical characteristics of preventing long-term high-power charging of the driving battery and increasing the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a block diagram of the RV charging control circuit based on speed sensing in this utility model;

[0014] Figure 2 This is the schematic diagram of the main control unit;

[0015] Figure 3 Part of the principle of DC / DC buck-boost circuit Figure 1 ;

[0016] Figure 4 Part of the principle of DC / DC buck-boost circuit Figure 2 ;

[0017] Figure 5 This is the schematic diagram of the PWM adjustment circuit;

[0018] Figure 6 This is the schematic diagram of the input switching circuit;

[0019] Figure 7 This is a working diagram of the RV charging control circuit in the preferred embodiment of the present utility model. DETAILED DESCRIPTION

[0020] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

[0021] The utility model discloses a charging control circuit for RV based on speed sensing, combined with Figures 1 to 6 As shown, it includes:

[0022] A solar power generation device 1 for generating electricity through solar panels;

[0023] Driving power generation device 2, used to generate electricity when the RV is driving;

[0024] An input switching circuit 3, configured to switch its input end to be connected to the output end of the solar power generation device 1 or the output end of the vehicle-mounted power generation device 2 according to a preset switching instruction;

[0025] Two DC / DC buck-boost circuits 4, the input end of each DC / DC buck-boost circuit 4 being connected to the output end of each input switching circuit 3, the DC / DC buck-boost circuit 4 being used to boost or buck the output voltage of each input switching circuit 3, and the two DC / DC buck-boost circuits 4 being used to charge the vehicle battery and the household battery, respectively;

[0026] GPS module 5, used to collect the position and speed signals of the RV;

[0027] The main control unit 6 is used to send a switching instruction to the input switching circuit 3, control the charging power of the two DC / DC buck-boost circuits 4, and obtain the position and speed signal of the RV from the GPS module 5. The main control unit 6 is also used to control the two DC / DC buck-boost circuits 4 to charge the driving battery and the life battery at the same time when the RV speed is higher than the preset value, and control one DC / DC buck-boost circuit 4 to charge the driving battery when the RV speed is lower than the preset value.

[0028] In the above circuit, the main control unit 6 reads the position and speed signals collected by the GPS module 5. The main control unit 6 compares the position and speed signals with the set speed value and starts charging the life battery in advance according to the driving speed. It also promptly diverts the charging power supplied to the driving battery, thereby improving the charging power and charging environment of the driving battery, thereby preventing damage to the driving battery and extending the service life of the driving battery. At the same time, it can also ensure that the life battery is charged in time. Therefore, the utility model has the technical characteristics of preventing long-term high-power charging of the driving battery and improving the battery life.

[0029] In order to realize the control of the DC / DC buck-boost circuit 4 and the reasonable distribution of charging power, in this embodiment, see Figure 1 A PWM adjustment circuit 7 is connected between the DC / DC buck-boost circuit 4 and the main control unit 6 .

[0030] For the preferred circuit structure of the DC / DC buck-boost circuit 4 and the main control unit 6, please refer to Figure 2 and Figure 3 The DC / DC buck-boost circuit 4 includes a buck-boost chip U11 of model EG1151 and its peripheral circuits, and the main control unit 6 includes a single-chip microcomputer U16 of model CH32V203C8T6 and its peripheral circuits.

[0031] See Figure 1In this embodiment, the PWM adjustment circuit 7 is preferably used to realize the drive control of the EG1151 chip. Specifically, see Figure 5 The PWM adjustment circuit 7 includes a comparator U31.1, the non-inverting terminal of the comparator U31.1 is grounded through a resistor R81, the inverting terminal of the comparator U31.1 is connected to the single-chip computer U16 through resistors R77 and R76 connected in series, a resistor R49 and a capacitor C85 connected in parallel are connected between the inverting terminal and the output terminal of the comparator U31.1, the output terminal of the comparator U31.1 is connected to the first control terminal IFB1+ of the buck-boost chip U11 through resistors R75 and R80 connected in series, and the second control terminal IFB1- of the buck-boost chip U11 is grounded through a resistor R79.

[0032] See Figure 1 This embodiment also includes an RV startup detection circuit 8, which is configured to send a startup signal to the main control unit 6 when the RV is started. The main control unit 6 can detect the RV's startup status based on the startup signal sent by the RV startup detection circuit 8. While the RV is started and driving, the driving battery and the household battery can be charged via the driving power generation device 2. Furthermore, this embodiment is equipped with a solar photovoltaic input circuit. After the RV is parked and turned off, the main control unit 6 can switch to the photovoltaic charging circuit based on speed information, solar panel photovoltaic voltage, generator voltage, and other information, thereby achieving dual energy input switching.

[0033] In order to stabilize the charging voltage, this embodiment includes an EMI circuit 9 , which is connected between the output end of the DC / DC buck-boost circuit 4 and the driving battery.

[0034] Furthermore, this embodiment includes a battery temperature detection circuit 10, which is used to collect the temperatures of the driving battery and the household battery and transmit them in the form of electrical signals to the main control unit 6. When the temperature detected by the battery temperature detection circuit 10 is too high, the main control unit 6 can promptly cut off the battery charging circuit and wait for the battery to cool down, thereby ensuring charging safety and reliability.

[0035] Based on the above technical principles, it can be seen that the present invention retains the charging mode of the traditional RV life battery. In the preferred embodiment of the present invention, the charging control principle is shown in Figure 7 As shown, since the charging current increases when the RV is traveling at high speed and decreases when traveling at low speed, the utility model adopts a method of adjusting the generator load, thereby improving the utilization efficiency of the generator, improving the power and current of the driving battery charging, and achieving the purpose of extending the service life of the driving battery.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the technical scope of the present invention should be included in the scope of protection of the present invention.

Claims

1. A RV charging control circuit based on speed sensing, characterized in that: include: A solar power generation device (1) for generating electricity through solar panels; A driving power generation device (2) for generating electricity when the RV is driving; An input switching circuit (3) is used to switch its input end to be connected to the output end of the solar power generation device (1) or the output end of the vehicle-mounted power generation device (2) according to a preset switching instruction; Two DC / DC buck-boost circuits (4), the input end of each DC / DC buck-boost circuit (4) being connected to the output end of the input switching circuit (3), the DC / DC buck-boost circuit (4) being used to perform a step-up or step-down process on the output voltage of the input switching circuit (3), and the two DC / DC buck-boost circuits (4) being used to charge the driving battery and the household battery respectively; GPS module (5), used to collect the position and speed signals of the RV; A main control unit (6) is used to send a switching instruction to the input switching circuit (3), control the charging power of the two DC / DC buck-boost circuits (4), and obtain the position and speed signal of the RV from the GPS module (5). The main control unit (6) is also used to control the two DC / DC buck-boost circuits (4) to charge the driving battery and the living battery simultaneously when the RV speed is higher than a preset value, and control the one DC / DC buck-boost circuit (4) to charge the driving battery when the RV speed is lower than the preset value.

2. The RV charging control circuit based on speed sensing according to claim 1, characterized in that: A PWM adjustment circuit (7) is connected between the DC / DC step-up / step-down circuit (4) and the main control unit (6).

3. The RV charging control circuit based on speed sensing according to claim 2, characterized in that: The DC / DC buck-boost circuit (4) includes a buck-boost chip U11 of model EG1151, and the main control unit (6) includes a single-chip microcomputer U16 of model CH32V203C8T6.

4. The RV charging control circuit based on speed sensing according to claim 3, characterized in that: The PWM adjustment circuit (7) includes a comparator U31.1, wherein the in-phase terminal of the comparator U31.1 is grounded via a resistor R81, the inverting terminal of the comparator U31.1 is connected to the single-chip computer U16 via a resistor R77 and a resistor R76 connected in series, a resistor R49 and a capacitor C85 connected in parallel are connected between the inverting terminal and the output terminal of the comparator U31.1, the output terminal of the comparator U31.1 is connected to the first control terminal IFB1+ of the buck-boost chip U11 via a resistor R75 and a resistor R80 connected in series, and the second control terminal IFB1- of the buck-boost chip U11 is grounded via a resistor R79.

5. The RV charging control circuit based on speed sensing according to claim 1, characterized in that: It comprises a recreational vehicle start-up detection circuit (8), wherein the recreational vehicle start-up detection circuit (8) is used to send a start-up signal to the main control unit (6) when the recreational vehicle is started.

6. The RV charging control circuit based on speed sensing according to claim 1, characterized in that: It comprises an EMI circuit (9), wherein the EMI circuit (9) is connected between the output end of the DC / DC step-up / step-down circuit (4) and the driving battery.

7. The RV charging control circuit based on speed sensing according to claim 1, characterized in that: It comprises a battery temperature detection circuit (10), which is used to collect the temperatures of the driving battery and the household battery and transmit them to the main control unit (6) in the form of electrical signals.

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