CN217672496U - Vehicle-mounted communication terminal - Google Patents
Vehicle-mounted communication terminal Download PDFInfo
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- CN217672496U CN217672496U CN202221639001.7U CN202221639001U CN217672496U CN 217672496 U CN217672496 U CN 217672496U CN 202221639001 U CN202221639001 U CN 202221639001U CN 217672496 U CN217672496 U CN 217672496U
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- communication terminal
- charger
- overvoltage crowbar
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Abstract
The utility model discloses a vehicle-mounted communication terminal relates to the on-vehicle technical field. This application on-vehicle communication terminal includes smart antenna module and external battery, smart antenna module includes direct current converter, the charger of being connected with direct current converter, and with charger both way junction's overvoltage crowbar, charger and overvoltage crowbar all are connected with a load switch, overvoltage crowbar includes output and input, overvoltage crowbar's output both way junction charger, overvoltage crowbar's input and external battery both way junction, direct current converter external vehicle mounted power source. This application carries out reverse use and two-way connection with overvoltage crowbar, can realize carrying out overvoltage protection to charger and load switch in the circuit when discharging, for the system provides stand-by power supply, guarantees that the system does not cut off the power supply under emergency appears, maintains normal work. The problem that power supply short circuit test items need to be conducted on each interface in vehicle-mounted test is solved.
Description
Technical Field
The utility model relates to an on-vehicle technical field especially relates to an on-vehicle communication terminal.
Background
An intelligent Antenna Module of a vehicle-mounted information system, namely TCAM, english full name Telematics & Connectivity Antenna Module, is a vehicle-mounted communication terminal, and generally includes a power management unit, a CAN interface, an MCU, a communication Module, a bluetooth Module, and other Module circuits. The main functions include emergency call, vehicle remote diagnosis, vehicle remote control, vehicle data report, bluetooth digital key, wireless internet access and the like. The product forms comprise a shark fin and a flat antenna which are generally installed on the roof of a vehicle, and due to an emergency call, namely an eCALL function, a standby battery is required to be added in hardware design so as to be seamlessly switched to the standby battery when a main power supply is lost due to an emergency. The smart antenna module of the telematics system is generally mounted on the roof of a vehicle and has a high requirement for ambient temperature, for example, the smart antenna module may be exposed to the sun for a long time in summer, so that the battery is generally mounted separately from the terminal device and connected by a connector and a wire harness.
In the vehicle-mounted test standard, all interfaces are generally required to have a self-diagnosis function, namely, four states of short circuit to a power supply, short circuit to the ground, open circuit and normal operation can be identified. The prior general hardware scheme usually adopts a charging chip or a charger to realize overcurrent protection of an external battery, open circuit and normal work in place can be identified by an ADC circuit, but if a power supply is short-circuited, the charger and the external battery are over-voltage to influence the charging and the use of the external battery.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the embodiment of the present application is to provide an on-vehicle communication terminal, when current on-vehicle communication terminal appears short circuit or trouble, external battery discharges and can produce excessive pressure and influence the problem that the system supplies power and uses to the circuit in the meaning.
The utility model provides an above-mentioned technical problem adopted technical scheme as follows:
according to the utility model discloses an aspect provides a vehicle communication terminal, including smart antenna module and external battery, smart antenna module includes DC converter, the charger be connected with DC converter and with charger both way junction's overvoltage crowbar, charger and overvoltage crowbar all are connected with a load switch, overvoltage crowbar includes output and input, wherein overvoltage crowbar's output both way junction the charger, overvoltage crowbar's input with external battery both way junction, overvoltage crowbar realizes the overvoltage protection to the circuit, the external vehicle mounted power of DC converter.
The overvoltage protection circuit comprises an external battery, and is characterized by further comprising a battery interface, wherein the battery interface is connected with the external battery in a bidirectional mode, and the overvoltage protection circuit is arranged in the battery interface.
The overvoltage protection circuit is composed of discrete devices or integrated ICs.
The current carrying capacity of the overvoltage protection circuit is larger than the charging and discharging current of the external battery.
The voltage setting of the overvoltage protection point of the overvoltage protection circuit is lower than the maximum voltage value which can be borne by the intelligent antenna module and is simultaneously higher than the voltage value when the external battery is fully charged.
The overvoltage protection circuit comprises a resistor R4 and a triode Q1 which are connected with an input end, wherein an emitting electrode of the triode Q1 is electrically connected with the input end, the resistor R4 is connected with a base electrode of the triode Q1 through a resistor R3, the resistor R4 is grounded through a diode D1, and a collector electrode of the triode Q1 is grounded; the resistor R4 is also connected with a resistor R2 and a capacitor C1 in parallel, and the resistor R2 and the capacitor C1 are grounded through the resistor R1; the input end is connected with the output end through an MOS tube Q2.
Wherein, resistance R3, resistance R4, triode Q1's projecting pole, resistance R2's one end, electric capacity C1's one end all with MOS pipe Q2's source electrode is connected, MOS pipe Q2's grid passes through resistance R1 ground connection, MOS pipe Q2's drain electrode connection output, just MOS pipe Q2's drain electrode passes through load resistance R5 ground connection.
The vehicle-mounted power supply is KL30, and the output voltage is 12V.
Wherein, the output voltage of the direct current converter is 5V.
Wherein, the external battery is a nickel-metal hydride battery.
This embodiment vehicle communication terminal is through reverse overvoltage crowbar that sets up between charger and external battery, can effectively solve vehicle communication terminal and in the appearance short circuit, and external battery produces the problem that overvoltage influences and use to charger and change over switch in the circuit when discharging, through overvoltage crowbar can realize the overvoltage protection to whole system circuit, provides stand-by power supply for the system, guarantees that the system does not cut off the power supply under emergency, maintains normal work. The problem that a power supply (12V) short circuit test item needs to be carried out on each interface in the vehicle-mounted test is also solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a block diagram of a vehicle-mounted communication terminal according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of an embodiment of an overvoltage protection circuit of a vehicle-mounted communication terminal provided in the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention to be solved clearer and more obvious, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Please refer to fig. 1 to fig. 2, which are schematic structural diagrams of a vehicle-mounted communication terminal according to an embodiment of the present invention. Only the portions related to the present embodiment are shown for convenience of explanation.
Example one
Referring to fig. 1 and fig. 2, an embodiment of the present application provides a vehicle-mounted communication terminal, where the vehicle-mounted communication terminal includes an intelligent antenna module 10 and an external battery 20, the intelligent antenna module 10 includes a dc converter 11, a charger 12 connected to the dc converter 11, and an overvoltage protection circuit 13 bidirectionally connected to the charger 12, the charger 12 and the overvoltage protection circuit 13 are both connected to a load switch 14, the overvoltage protection circuit 13 includes an output end and an input end, the output end of the overvoltage protection circuit 13 is bidirectionally connected to the charger 12, the input end of the overvoltage protection circuit 13 is bidirectionally connected to the external battery 20, overvoltage protection KL for the charger 12 and the load switch 14 can be implemented when the external battery discharges, and the dc converter 11 is externally connected to a vehicle-mounted power supply 30.
The dc converter 11 is configured to convert a high voltage of 12V of the external vehicle-mounted power source KL30 into a voltage of 5V, where the voltage of 5V may also be a stable power source of the entire vehicle-mounted communication terminal system, and the converted voltage of 5V is used as an input voltage of the charger 12, so that the charger 12 charges the external battery 20.
In an embodiment, the battery protection circuit further includes a battery interface, the battery interface is bidirectionally connected to the external battery 20, and the overvoltage protection circuit 13 is disposed in the battery interface.
In one embodiment, the overvoltage protection circuit is formed using discrete devices or an integrated IC.
In the embodiment of the present application, the current carrying capacity of the overvoltage protection circuit 13 is required to be greater than the charging and discharging current of the external battery 20; the voltage setting of the overvoltage protection point of the overvoltage protection circuit 13 is lower than the maximum voltage value that can be borne by the smart antenna module and is higher than the voltage value when the external battery is fully charged.
In an embodiment, the vehicle-mounted power supply is KL30, and the output voltage is 12V.
In one embodiment, the output voltage of the dc converter is 5V.
In one embodiment, the external battery 20 is a nickel metal hydride battery.
Specifically, the external battery 20 may be formed of 3 nickel-metal hydride batteries connected in series.
In this embodiment, the load switch 14 mainly implements switching between the vehicle-mounted power supply and the standby power supply (external battery), and when a fault occurs, seamless switching between the main power supply and the standby power supply can be implemented immediately.
Referring to fig. 2, in the present embodiment, the overvoltage protection circuit 13 includes a resistor R4 and a transistor Q1 connected to an input end, an emitter of the transistor Q1 is electrically connected to the input end, the resistor R4 is connected to a base of the transistor Q1 through a resistor R3, the resistor R4 is grounded through a diode D1, and a collector of the transistor Q1 is grounded. The resistor R4 is further connected with a resistor R2 and a capacitor C1 in parallel, the resistor R2 and the capacitor C1 are grounded through the resistor R1, and the input end and the output end are connected through an MOS (metal oxide semiconductor) tube Q2.
Wherein, resistance R3, resistance R4, triode Q1's projecting pole, resistance R2's one end, electric capacity C1's one end all with MOS pipe Q2's source electrode is connected, MOS pipe Q2's grid passes through resistance R1 ground connection, MOS pipe Q2's drain electrode connection output, just MOS pipe Q2's drain electrode passes through load resistance R5 ground connection.
In the overvoltage protection circuit 13 of the present embodiment, the resistor R3, the resistor R4, the diode D1 and the transistor Q1 are used as an overvoltage protection point. The resistor R2 and the resistor R1 have the function of ensuring that the switch can be normally conducted when the input voltage does not exceed overvoltage. The capacitor C1 is used for adjusting the turn-on time of the Q2 and plays a role in adjusting or slowing down the starting of the switch. In the embodiment of the present application, the overvoltage protection circuit 13 is used reversely, specifically, the input end of the overvoltage protection circuit 13 is connected to the external battery 20, and the output end is connected to the charger 12.
When the vehicle-mounted communication terminal works in the embodiment of the application, the direct current converter 11 is connected with a KL30 (Battery) vehicle-mounted power supply, 12V voltage input by the vehicle-mounted power supply is converted into 5V voltage, the direct current converter 11 (DCDC) outputs 5V voltage and is connected with the charger 12 to serve as input voltage of the charger 12, so that the charging function of the external Battery 20 is realized, at the moment, the load switch 14 is in a closed state, and the external Battery 20 is only charged and is not discharged; when an emergency occurs, such as a car crash or other factors, the KL30 vehicle-mounted power supply is disconnected, or when the system voltage is lower than 6V, the load switch 14 is automatically switched to an open state, the external battery 20 starts to discharge, and overvoltage protection is implemented on the charger 12 and the load switch 14 through bidirectional conduction of the overvoltage protection circuit 13, so that a stable standby power supply is provided for the whole system, the system is ensured not to be powered off in the emergency, and the system is maintained to normally work, such as emergency call or vehicle data uploading and other functions are implemented.
When the test battery interface is in short circuit or the external battery wiring harness is in wrong lap joint with the wiring harness of the KL30 vehicle-mounted power supply in emergency, namely the battery interface is in short circuit (12V) with the KL30 vehicle-mounted power supply, the overvoltage protection circuit 13 on the charging and discharging path can realize overvoltage protection at the moment, and the connection between the external vehicle-mounted power supply and the internal circuit is automatically cut off; when the short-circuit fault is removed, the charge-discharge circuit can be automatically recovered. Therefore, the problem that in the vehicle-mounted test, a test item for short circuit of the power supply (12V) needs to be carried out on each interface is solved.
The embodiment of the utility model provides a vehicle-mounted communication terminal through set up the overvoltage crowbar between charger and external battery in the reverse direction, can effectively solve vehicle-mounted communication terminal when the short circuit appears, avoids external battery 20 to produce the problem that excessive pressure influences system power supply and use to charger and change over switch in the circuit when discharging, through the overvoltage crowbar just can realize carrying out overvoltage protection to whole circuit, can cut off the connection of external vehicle power supply and internal circuit automatically when breaking down and system power short circuit; when the system is in failure or overvoltage, the state of the switch can be automatically switched through the switch, the external battery 20 starts to discharge, a standby power supply is provided for the whole system, the system is ensured not to be powered off under emergency, and the normal work of the system is maintained.
In the embodiment of the application, the overvoltage protection circuit can be formed by discrete devices or an integrated IC, and the overvoltage protection circuit realizes the functions of overvoltage protection, charging and discharging bidirectional conduction of an external battery and short-circuit protection of a battery interface. The overvoltage protection circuit needs to pay attention to two points during model selection and design, firstly, the current carrying capacity of the overvoltage protection circuit is larger than the charging and discharging current of an external battery, and secondly, the voltage setting of the overvoltage protection point of the overvoltage protection circuit is lower than the maximum voltage value which can be borne by a system and is higher than the voltage value when the battery is fully charged. The vehicle-mounted communication terminal can also be used for other equipment needing an external spare battery, such as a Tbox and a digital key system.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and the scope of the invention is not limited thereto. Any modification, equivalent replacement or improvement made by those skilled in the art without departing from the scope and spirit of the present invention should be within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides an on-vehicle communication terminal, its characterized in that, includes smart antenna module and external battery, smart antenna module includes DC converter, the charger be connected with DC converter and with charger both way junction's overvoltage crowbar, charger and overvoltage crowbar all are connected with a load switch, overvoltage crowbar includes output and input, wherein overvoltage crowbar's output both way junction the charger, overvoltage crowbar's input with external battery both way junction, overvoltage crowbar realizes the overvoltage protection to the circuit, the external vehicle mounted power of DC converter.
2. The vehicle communication terminal of claim 1, further comprising a battery interface, wherein the battery interface is bi-directionally coupled to the external battery, and wherein the overvoltage protection circuit is disposed in the battery interface.
3. The vehicle communication terminal of claim 1, wherein the overvoltage protection circuit is formed using discrete components or an integrated IC.
4. The vehicle communication terminal as recited in claim 3, wherein the overvoltage protection circuit has a current carrying capability greater than a charge and discharge current of the external battery.
5. The vehicle communication terminal according to claim 3 or 4, wherein a voltage setting of an overvoltage protection point of the overvoltage protection circuit is lower than a maximum voltage value that the smart antenna module can withstand, and is higher than a voltage value when the external battery is fully charged.
6. The vehicle communication terminal according to claim 5, wherein the over-voltage protection circuit comprises a resistor R4 and a transistor Q1 connected to an input terminal, an emitter of the transistor Q1 is electrically connected to the input terminal, the resistor R4 is connected to a base of the transistor Q1 through a resistor R3, the resistor R4 is grounded through a diode D1, and a collector of the transistor Q1 is grounded; the resistor R4 is also connected with a resistor R2 and a capacitor C1 in parallel, and the resistor R2 and the capacitor C1 are grounded through the resistor R1; the input end is connected with the output end through an MOS tube Q2.
7. The vehicle communication terminal as claimed in claim 6, wherein the resistor R3, the resistor R4, the emitter of the transistor Q1, one end of the resistor R2, and one end of the capacitor C1 are all connected to the source of the MOS transistor Q2, the gate of the MOS transistor Q2 is grounded through the resistor R1, the drain of the MOS transistor Q2 is connected to the output terminal, and the drain of the MOS transistor Q2 is grounded through the load resistor R5.
8. The vehicle communication terminal according to claim 1, wherein the vehicle power supply is KL30 and the output voltage is 12V.
9. The vehicle communication terminal according to claim 1, wherein the dc converter output voltage is 5V.
10. The vehicle-mounted communication terminal according to claim 1, wherein the external battery is a nickel metal hydride battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221639001.7U CN217672496U (en) | 2022-06-28 | 2022-06-28 | Vehicle-mounted communication terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221639001.7U CN217672496U (en) | 2022-06-28 | 2022-06-28 | Vehicle-mounted communication terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217672496U true CN217672496U (en) | 2022-10-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221639001.7U Active CN217672496U (en) | 2022-06-28 | 2022-06-28 | Vehicle-mounted communication terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217672496U (en) |
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2022
- 2022-06-28 CN CN202221639001.7U patent/CN217672496U/en active Active
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