CN214798908U

CN214798908U - Vehicle-mounted control system using farad capacitor battery

Info

Publication number: CN214798908U
Application number: CN202023273595.8U
Authority: CN
Inventors: 顾晨; 郑鹏; 吴泓雯; 金昊炫; 施浏晟; 胡权; 周伯涛; 楼勇亮
Original assignee: Soyea Technology Co Ltd
Current assignee: Soyea Technology Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-11-19
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses an use farad electric capacity battery's on-vehicle control system provides a realization device that the charge-discharge that uses farad electric capacity backup battery does not have the interrupt switching. The power supply system charges the Faraday capacitor when the external power supply is connected, automatically detects the connection condition of the external power supply, and switches to the Faraday capacitor for power supply when the external power supply is disconnected. It has the advantages and positive effects that: the farad capacitor of the system can be charged to any potential within the rated voltage range and can be discharged completely, while the ordinary battery is limited by the chemical reaction of the ordinary battery to work within a narrow voltage range, and permanent damage can be caused if the ordinary battery is over-discharged; meanwhile, the switching device is different from the existing other switching devices which use the MCU to detect the external power supply and switch the charging and discharging states to generate time delay and state errors caused by the running of programs in the MCU, and adopts pure hardware to detect and switch, so that the real-time performance and the reliability are improved.

Description

Vehicle-mounted control system using farad capacitor battery

Technical Field

The utility model relates to an electrical field of mobile unit, especially an use farad electric capacity battery's on-vehicle control system.

Background

The vehicle-mounted control system is an important part of a vehicle networking system, mainly completes the collection, interaction, display and uploading of data inside and outside a vehicle, and can realize the functions of remote control, air upgrading and the like.

At present, in the traditional vehicle-mounted control system equipment, a standby battery is not necessarily equipped, so that after the main power supply vehicle-mounted battery is powered off, working current cannot be provided for a vehicle-mounted control system, and system data are lost instantly; or even if the backup battery exists, the capacity of the backup battery is limited, and if the backup battery is used for a long time, the backup battery is over-discharged to influence the service life of the backup battery: also need adopt special battery charge and discharge management chip to carry out the reserve battery management a bit, nevertheless the cost is higher, because of the battery characteristic is different simultaneously, leads to selecting different chips to different batteries needs, is unfavorable for the compatible design of product.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides an automatic switching of charge-discharge that realizes through pure circuit design, and the effectual on-vehicle control system who uses farad electric capacity battery of charge-discharge.

In order to reach above-mentioned purpose, the utility model discloses an use on-vehicle control system of farad capacitor battery, including input voltage, voltage conversion circuit and on-vehicle control system, input voltage convert to rated voltage through voltage conversion circuit and give on-vehicle control system power supply, still be connected with farad capacitor spare battery through charge-discharge switching circuit between characterized by voltage conversion circuit and the on-vehicle control system, and input voltage also lug connection is on charge-discharge switching circuit.

The farad capacitor backup battery is composed of two farad capacitors FC1 and FC2 which are connected in series, and the negative electrode of the farad capacitor backup battery is grounded;

the charge-discharge switching circuit comprises an input voltage VIN, a working voltage Vsupply obtained by the voltage conversion circuit:

an input voltage VIN is grounded through a resistor R1 and a resistor R2 which are connected in series, a B pole of a triode Q3 is connected between the resistor R1 and the resistor R2 through a resistor R5, a C pole of a triode Q3 is grounded through a resistor R8, a working voltage Vsupply is connected with an E pole of a triode Q3 through the resistor R7, the working voltage Vsupply further sequentially passes through an S pole and a D pole of an MOS tube Q1 and is connected with a farad capacitor FC1 and a farad capacitor FC2 to form a passage, and the E pole of the triode Q3 is connected with a G pole of the MOS tube Q1;

the input voltage VIN is grounded through a resistor R3 and a resistor R4 which are connected in series, a B pole of a triode Q4 is connected between a resistor R3 and a resistor R4 through a resistor R6, an E pole of a triode Q4 is grounded, a C pole of a triode Q4 is connected with a G pole of a MOS tube Q2, the working voltage Vsupply sequentially passes through a D pole and an S pole of a MOS tube Q2 and a resistor R10 and is connected with a farad capacitor FC1 and a farad capacitor FC2 which are connected in series to form a passage, and meanwhile, a resistor R9 is further arranged between the G pole and the S pole of the MOS tube Q2.

Drawings

FIG. 1 is a circuit configuration diagram of embodiment 1.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the objects of the present invention, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

Example 1.

The vehicle-mounted control system using the farad capacitor battery described in this embodiment includes an input voltage, a voltage conversion circuit, and a vehicle-mounted control system, where the input voltage is converted to a rated voltage by the voltage conversion circuit to supply power to the vehicle-mounted control system, a farad capacitor backup battery is further connected between the voltage conversion circuit and the vehicle-mounted control system by a charge-discharge switching circuit, and the input voltage is also directly connected to the charge-discharge switching circuit.

The farad capacitor backup battery consists of two farad capacitors FC1 and FC2 which are connected in series, and the negative electrode of the farad capacitor backup battery is grounded;

an input voltage VIN is grounded through a resistor R1 and a resistor R2 which are connected in series, a B pole of a triode Q3 is connected between the resistors R1 and R2 through a resistor R5, a C pole of a triode Q3 is grounded through a resistor R8, a working voltage Vsupply is connected with an E pole of a triode Q3 through the resistor R7, the working voltage Vsupply also sequentially passes through an S pole and a D pole of an MOS tube Q1 to form a passage with farad capacitors FC1 and FC2, and the E pole of the triode Q3 is connected with a G pole of the MOS tube Q1;

the input voltage VIN is grounded through resistors R3 and R4 which are connected in series, a pole B of a triode Q4 is connected between a resistor R3 and a resistor R4 through a resistor R6, a pole E of the triode Q4 is grounded, a pole C of the triode Q4 is connected with a pole G of a MOS tube Q2, the working voltage Vsupply sequentially passes through a pole D and a pole S of the MOS tube Q2 to form a passage with farad capacitors FC1 and FC2 which are connected in series, and a resistor R9 is arranged between the pole G and the pole S of the MOS tube Q2.

When the vehicle-mounted control system works, when the input voltage is connected with the vehicle-mounted main power supply, the input voltage is converted into the working voltage which can be accepted by the vehicle-mounted control system through the voltage conversion circuit. The working voltage is supplied to the vehicle-mounted control system device on one hand, and the charging and discharging switching circuit is used for charging the farad capacitor standby battery on the other hand. When the input voltage is disconnected with the vehicle-mounted main power supply, the voltage conversion circuit does not output, and the working voltage is provided by the farad capacitor backup battery. The charging and discharging switching circuit obtains the current power supply state from the input voltage, so that the selection circuit adopts a charging or discharging branch circuit. When the charging branch circuit is adopted, current flows to a farad capacitor charging battery from the working voltage through the charging and discharging switching circuit; when the discharging branch circuit is adopted, current flows to the working voltage position from the farad capacitor charging battery through the charging and discharging switching circuit, and the vehicle-mounted control system is supplied with power.

For a specific circuit, farad capacitors FC1 and FC2 are connected in series and used as a vehicle control system backup and a battery. VIN is an external vehicle body input voltage, and the voltage is converted into an operating voltage Vsupply which can be used by the vehicle-mounted control system through a voltage conversion circuit. As long as the Vsupply voltage is greater than the sum of the farad voltage and the body diode forward voltage drop inside the MOS transistor Q2, charging of the farad capacitance through the body diode begins. However, if charged only by the diode path, the farad voltage will always be lower than Vsupply, which is about the forward voltage drop of the body diode. To compensate for this defect, an input voltage detection switching circuit composed of R3, R4, R6, and Q4, and an input voltage detection switching circuit composed of R1, R2, R5, and Q3 are introduced.

When the external input voltage VIN is connected to the vehicle-mounted power supply, i.e., enters a charging state, the voltage detected by the B pole of the transistor Q4 through the voltage dividing resistors R3 and R4 is greater than the emitter voltage, and the C pole and the E pole of the transistor Q4 are conducted, so that the voltage difference between the G pole and the S pole of the MOS transistor Q2 is greater than the threshold voltage, and thus the D pole and the S pole of the MOS transistor Q2 are directly conducted. Meanwhile, the voltage detected by the B pole of the triode Q3 through the voltage dividing resistors R1 and R2 is greater than the emitter junction voltage of the triode Q3, the E pole and the C pole of the triode Q3 are cut off, so that no voltage difference exists between the G pole and the S pole of the MOS transistor Q1, the MOS transistor Q1 is cut off, and the discharge circuit does not work.

When the external input voltage VIN is disconnected from the vehicle-mounted power supply, that is, the vehicle-mounted power supply enters a discharging state, the voltage detected by the B pole of the triode Q4 through the voltage dividing resistors R3 and R4 is smaller than the emitter voltage, the C pole and the E pole of the triode Q4 are cut off, so that no voltage difference exists between the G pole and the S pole of the MOS transistor Q2, and the D pole and the S pole of the MOS transistor Q2 are cut off, that is, the D pole and the S pole are in an open circuit state. Meanwhile, Vsupply has no voltage, the voltage at two ends of the farad capacitor is greater than the working voltage Vsupply, and the body diode of the MOS tube Q2 is also cut off in the reverse direction. When the external input voltage VIN is disconnected with the vehicle-mounted power supply, the instantaneous working voltage Vsupply of power failure is not output, and at the moment, the voltage VBB of the farad capacitor is larger than the working voltage Vsupply. Meanwhile, the voltage detected by the B electrode of the triode Q3 through the voltage dividing resistors R1 and R2 is smaller than the emitter junction voltage of the triode Q3, and the C electrode and the E electrode of the triode Q3 are conducted, so that the voltage difference between the G electrode and the S electrode of the MOS transistor Q1 is larger than the threshold voltage, and the D electrode and the S electrode of the MOS transistor Q1 are conducted. Therefore, in the whole discharging process, the VBB voltage is basically the same as the Vsupply voltage, the voltage difference generated by the body diode of the MOS tube Q1 is avoided, and the electric energy of the farad capacitor is fully utilized.

Meanwhile, although the farad capacitor has the advantage of large charging and discharging current, considering that the output capability of the voltage conversion circuit between the input voltage VIN and the operating voltage Vsupply is limited, in order to prevent the voltage conversion circuit from being overloaded, a current limiting resistor R10 is reserved on the charging path to limit the maximum charging current in the charging circuit.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed by the preferred embodiment, it is not limited to the present invention, and any person skilled in the art can make modifications or changes equivalent to the equivalent embodiments by utilizing the above disclosed technical contents without departing from the technical scope of the present invention, but all the modifications, changes and changes of the technical spirit of the present invention made to the above embodiments are also within the scope of the technical solution of the present invention.

Claims

1. A vehicle-mounted control system using a farad capacitor battery comprises an input voltage, a voltage conversion circuit and a vehicle-mounted control system, wherein the input voltage is converted into a rated voltage through the voltage conversion circuit to supply power to the vehicle-mounted control system; the farad capacitor backup battery consists of two farad capacitors FC1 and FC2 which are connected in series, and the negative electrode of the farad capacitor backup battery is grounded; the charge-discharge switching circuit comprises an input voltage VIN and a working voltage Vsupply obtained by the voltage conversion circuit;

an input voltage VIN is grounded through a resistor R1 and a resistor R2 which are connected in series, a B pole of a triode Q3 is connected between the resistor R1 and the resistor R2 through a resistor R5, a C pole of a triode Q3 is grounded through a resistor R8, a working voltage Vsupply is connected with an E pole of a triode Q3 through the resistor R7, the working voltage Vsupply further sequentially passes through an S pole and a D pole of a MOS tube Q1, and forms a passage with a farad capacitor FC1 and a farad capacitor FC2 which are arranged in series, and the E pole of a triode Q3 is connected with a G pole of the MOS tube Q1; the input voltage VIN is grounded through a resistor R3 and a resistor R4 which are connected in series, a B pole of a triode Q4 is connected between the resistor R3 and the resistor R4 through a resistor R6, an E pole of a triode Q4 is grounded, a C pole of the triode Q4 is connected with a G pole of the MOS tube Q2, the working voltage Vsupply sequentially passes through a D pole, an S pole and the resistor R10 of the MOS tube Q2 and is connected with a farad capacitor FC1 and a farad capacitor FC2 which are arranged in series to form a passage, and a resistor R9 is further arranged between the G pole and the S pole of the MOS tube Q2.