CN215990309U - Vehicle-mounted T-Box safe power supply system - Google Patents
Vehicle-mounted T-Box safe power supply system Download PDFInfo
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- CN215990309U CN215990309U CN202122198028.9U CN202122198028U CN215990309U CN 215990309 U CN215990309 U CN 215990309U CN 202122198028 U CN202122198028 U CN 202122198028U CN 215990309 U CN215990309 U CN 215990309U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
A vehicle-mounted T-Box safety power supply system comprises a main power supply branch and a standby power supply branch which supply power to a direct current load of a vehicle-mounted T-Box, a delay unit, a monitoring unit, a buffer unit and a switching unit, wherein the delay unit is used for delaying preset time T and outputting an enabling signal to the buffer unit after the main power supply branch is electrified; the monitoring unit is used for monitoring the voltage state of the main power supply branch in real time, and rapidly outputting state information to the buffer unit when the voltage of the main power supply branch is abnormal or normal; the buffer unit is used for allowing the receiving of the state information from the monitoring unit and outputting the enable signal to the switching unit after the enable signal output by the delay unit is effective; the switching unit is used for starting and switching on the standby power supply branch when the enable signal output by the buffer unit is effective, and closing and switching off the standby power supply branch when the enable signal output by the buffer unit is ineffective. The utility model can prevent the voltage of the main power supply branch circuit from being mistakenly switched due to the influence of noise and the like, and improves the reliability of a switching system.
Description
Technical Field
The utility model relates to the field of vehicle-mounted T-Box, in particular to a vehicle-mounted T-Box safe power supply system.
Background
With the development of automobile electronic technology, automobiles have rapidly advanced towards the direction of intellectualization and networking, and vehicle-mounted T-boxes (vehicle-mounted terminals) have become one of the key parts of automobiles, are important components for implementing remote monitoring of vehicles, and are increasingly widely applied.
The main power supply of the vehicle-mounted T-Box on a vehicle usually adopts a storage battery for power supply, when a power supply branch of the vehicle-mounted storage battery breaks down, the main power supply needs to be found in time, and quickly and effectively switched to the power supply branch of an internal backup battery to continuously work, so that seamless, accurate and quick switching between the backup power supply and a main power supply is required. At present, the power supply state detection and switching control of the main power supply branch circuit generally adopt an MCU (microprogrammed control unit) software mode, once the bug problem occurs in software, whether equipment can continue to work is directly influenced, and in addition, the MCU software mode needs to occupy part of IO (input output) interfaces for detecting and switching the power supply state of the main power supply branch circuit and the standby power supply branch circuit, not only occupies MCUIO (multi-channel input output) resources, but also leads to low utilization rate.
SUMMERY OF THE UTILITY MODEL
Based on the technical scheme, the utility model provides a vehicle-mounted T-Box safety power supply system, which aims to solve the technical problems that the vehicle-mounted T-Box safety power supply system in the prior art occupies MCUIO resources and causes low utilization rate.
In order to achieve the above object, the present invention provides a vehicle-mounted T-Box safe POWER supply system, including a main POWER supply branch and a standby POWER supply branch, which supply POWER to a dc load of the vehicle-mounted T-Box, where the main POWER supply branch is used to connect with a vehicle-mounted Battery to obtain a main POWER, and the standby POWER supply branch is used to connect with a Battery built in the vehicle-mounted T-Box to obtain a standby POWER, and the system further includes a delay unit, a monitoring unit, a buffering unit, and a switching unit, where:
the delay unit is connected with the buffer unit and is used for delaying preset time T after the main power supply branch is electrified and outputting an enabling signal to the buffer unit;
the monitoring unit is connected with the buffer unit and is used for monitoring the voltage state of the main power supply branch in real time and rapidly outputting state information to the buffer unit when the voltage of the main power supply branch is abnormal or normal;
the buffer unit is connected with the switching unit and used for allowing the state information from the monitoring unit to be received after the enable signal output by the delay unit is valid and then outputting the enable signal to the switching unit;
the switching unit is connected in series in the standby power supply branch circuit and used for starting and switching on the standby power supply branch circuit when the enable signal output by the buffer unit is effective, and switching off the standby power supply branch circuit when the enable signal output by the buffer unit is ineffective.
As a further preferable embodiment of the present invention, a diode D1 is connected in series in the main power supply branch, and a diode D2 is connected in series at an output end of the switching unit in the backup power supply branch.
As a further preferable technical solution of the present invention, the delay unit includes a chip IC1 with a model number BU4229G-TR, the chip IC1 is configured to obtain an operating level VCC1 while the main power supply branch is powered on, and the chip IC1 first outputs a low level after obtaining the operating level VCC1, and outputs a high level after a preset delay time T, so as to serve as an enable signal output to the buffer unit.
As a further preferable technical solution of the present invention, the delay unit further includes a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, and a transistor Q1, wherein:
the CT pin of the chip IC1 is connected to GND through a capacitor C1;
the VOUT pin of the chip IC1 is divided into three paths, wherein the first path is connected to a working level VCC _1 through a resistor R2, the second path is connected to the base electrode of the triode Q1 through a resistor R3, and the third path is connected to GND through a capacitor C3;
the VOD pin of the chip IC1 is divided into two paths, wherein one path is connected to the working level VCC _1 through a resistor R1, and the other path is connected to GND through a capacitor C2;
the collector of the triode Q1 is connected with the working level VCC1, the emitter is connected to GND through the resistor R4, and the emitter is also used as the output end of the delay unit for being connected with the buffer unit to output the enable signal to the buffer unit.
As a further preferable technical solution of the present invention, the monitoring unit includes a chip IC2 with model number S-19110AAEA, and the chip IC2 is used for monitoring the voltage state of the main POWER in the main POWER supply branch in real time.
As a further preferable technical solution of the present invention, the monitoring unit further includes a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a diode D3, a diode D4, a diode D5, and a transistor Q2, wherein:
a VDD pin of the chip IC2 is connected to a main POWER supply branch through a resistor R5 to obtain a main POWER supply, the VDD pin is connected to an emitter of a triode Q2 through a resistor R6 and a diode D4 which are connected in sequence, a cathode of a diode D4 faces to one end of a connecting resistor R6, the VDD pin is further connected to GND through a diode D3 and a capacitor C4 respectively, and a cathode of a diode D3 faces to one end of the connecting VDD pin;
the VN pin of the chip IC2 is connected to GND through a capacitor C5;
the VSS pin of the chip IC2 is connected with GND;
the CP pin of the chip IC2 is connected to GND through a capacitor C6;
an OUT pin of the chip IC2 is connected to a base electrode of the triode Q2 through a diode D5 and a resistor R9 which are connected in sequence, and a cathode of the diode D5 faces to one end connected with the OUT pin;
an emitter of the triode Q2 is connected with a working level VCC _2, a collector of the triode Q8926 is connected to GND through a resistor R10, and the collector of the triode Q2 is also connected with the buffer unit as an output end of the monitoring unit to output state information to the buffer unit;
the two ends of the resistor R7 are respectively connected with the cathode of the diode D4 and the cathode of the diode D5, the two ends of the resistor R7 are respectively connected with the anode of the diode D4 and the anode of the diode D5, and the anode of the diode D5 is further connected to GND through the capacitor C7.
As a further preferred embodiment of the present invention, the buffer unit includes a chip IC3 with model number SN74AVC2T245 RSWR.
As a further preferable technical solution of the present invention, the buffer unit further includes a resistor R11, a resistor R12, and a capacitor C8, a DIR1 pin, a DIR2 pin, and a GND pin of the chip IC3 are all connected to GND, an OE pin of the chip IC3 is connected to the delay unit to input the enable signal output by the delay unit, a B1 pin and a B2 pin of the chip IC3 are connected in parallel and then connected to the monitoring unit through the resistor R11 to input the state information output by the monitoring unit, a1 pin and a2 pin of the chip IC3 are connected in parallel and then used as an output terminal of the buffer unit to output the enable signal to the switching unit, and a1 pin and a2 pin after parallel connection are further connected to GND through the resistor R12, a VCCA pin and a VCCB pin of the chip IC3 are connected in parallel and then connected to the operating level VCC _3, and a VCCA VCCB pin and a VCCB pin after parallel connection are further connected to the capacitor C8.
According to the vehicle-mounted T-Box safe power supply system, the voltage state of the main power supply branch is monitored in real time in a hardware circuit mode, the monitoring result is output in real time and is notified to the switching unit at the later stage, and the purpose of automatic and rapid switching is achieved; the MCU detection mode is adopted, the problem that standby power supply branches cannot be switched when the MCU has bug can be avoided, and IO port resources of the MCU can be saved; meanwhile, a delayed execution mode is adopted in the releasing process, so that the voltage of the main power supply branch circuit can be prevented from being mistakenly switched due to the influence of factors such as noise, interference and the like, the reliability of a switching system is greatly improved, and the switching system is effectively ensured.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a block diagram of an example of a vehicle T-Box safety power supply system;
FIG. 2 is a circuit diagram of a delay unit, a monitoring unit and a buffer unit;
FIG. 3 is a timing diagram illustrating the detection of an anomaly in the main power branch;
fig. 4 is a release timing diagram of the main power branch returning to normal.
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The utility model will be further described with reference to the accompanying drawings and specific embodiments. In the preferred embodiments, the terms "upper", "lower", "left", "right", "middle" and "a" are used for clarity of description only, and are not used to limit the scope of the utility model, and the relative relationship between the terms and the terms is not changed or modified substantially without changing the technical content of the utility model.
As shown in fig. 1, the present invention provides a vehicle-mounted T-Box safe POWER supply system, including a main POWER supply branch and a standby POWER supply branch, where the main POWER supply branch is used to connect with a vehicle-mounted Battery to obtain a main POWER, and the standby POWER supply branch is used to connect with a Battery built in the vehicle-mounted T-Box to obtain a standby POWER, and the system further includes a delay unit, a monitoring unit, a buffering unit, and a switching unit, where:
the delay unit is connected with the buffer unit and is used for delaying preset time T after the main power supply branch is electrified and outputting an enabling signal to the buffer unit;
the monitoring unit is connected with the buffer unit and is used for monitoring the voltage state of the main power supply branch in real time and rapidly outputting state information to the buffer unit when the voltage of the main power supply branch is abnormal or normal;
the buffer unit is connected with the switching unit and used for allowing the state information from the monitoring unit to be received after the enable signal output by the delay unit is valid and then outputting the enable signal to the switching unit;
the switching unit is connected in series in the standby power supply branch circuit and used for starting and switching on the standby power supply branch circuit when the enable signal output by the buffer unit is effective, and switching off the standby power supply branch circuit when the enable signal output by the buffer unit is ineffective.
Preferably, a diode D1 is connected in series in the main power supply branch, and a diode D2 is connected in series at the output end of the switching unit in the standby power supply branch, so that the current of the main power supply branch can only be supplied to the dc load in one direction, and the current of the standby power supply branch can also only be supplied to the dc load in one direction, thereby improving the electricity safety.
In an embodiment, referring to fig. 2, the delay unit includes a chip IC1 with a model BU4229G-TR, the chip IC1 is configured to obtain an operating level VCC1 while the main power supply branch is powered on, the chip IC1 first outputs a low level after obtaining the operating level VCC1, and outputs a high level after a preset delay time T, so as to serve as an enable signal output to the buffer unit. The monitoring unit comprises a chip IC2 with the model number of S-19110AAEA, and the chip IC2 is used for monitoring the voltage state of the main POWER in the main POWER supply branch in real time. The buffer unit comprises a chip IC3 of model SN74AVC2T245 RSWR.
The delay unit further comprises a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a triode Q1, wherein:
the CT pin of the chip IC1 is connected to GND through a capacitor C1;
the VOUT pin of the chip IC1 is divided into three paths, wherein the first path is connected to a working level VCC _1 through a resistor R2, the second path is connected to the base electrode of the triode Q1 through a resistor R3, and the third path is connected to GND through a capacitor C3;
the VOD pin of the chip IC1 is divided into two paths, wherein one path is connected to the working level VCC _1 through a resistor R1, and the other path is connected to GND through a capacitor C2;
the collector of the triode Q1 is connected with the working level VCC1, the emitter is connected to GND through the resistor R4, and the emitter is also used as the output end of the delay unit for being connected with the buffer unit to output the enable signal to the buffer unit.
The monitoring unit further comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a diode D3, a diode D4, a diode D5 and a triode Q2, wherein:
a VDD pin of the chip IC2 is connected to a main POWER supply branch through a resistor R5 to obtain a main POWER supply, the VDD pin is connected to an emitter of a triode Q2 through a resistor R6 and a diode D4 which are connected in sequence, a cathode of a diode D4 faces to one end of a connecting resistor R6, the VDD pin is further connected to GND through a diode D3 and a capacitor C4 respectively, and a cathode of a diode D3 faces to one end of the connecting VDD pin;
the VN pin of the chip IC2 is connected to GND through a capacitor C5;
the VSS pin of the chip IC2 is connected with GND;
the CP pin of the chip IC2 is connected to GND through a capacitor C6;
an OUT pin of the chip IC2 is connected to a base electrode of the triode Q2 through a diode D5 and a resistor R9 which are connected in sequence, and a cathode of the diode D5 faces to one end connected with the OUT pin;
an emitter of the triode Q2 is connected with a working level VCC _2, a collector of the triode Q8926 is connected to GND through a resistor R10, and the collector of the triode Q2 is also connected with the buffer unit as an output end of the monitoring unit to output state information to the buffer unit;
the two ends of the resistor R7 are respectively connected with the cathode of the diode D4 and the cathode of the diode D5, the two ends of the resistor R7 are respectively connected with the anode of the diode D4 and the anode of the diode D5, and the anode of the diode D5 is further connected to GND through the capacitor C7.
The buffer unit further comprises a resistor R11, a resistor R12 and a capacitor C8, a DIR1 pin, a DIR2 pin and a GND pin of the chip IC3 are all connected with GND, an OE pin of the chip IC3 is connected to the delay unit to input an enable signal output by the delay unit, a B1 pin and a B2 pin of the chip IC3 are connected in parallel and then connected to the monitoring unit through the resistor R11 to input state information output by the monitoring unit, an A1 pin and an A2 pin of the chip IC3 are connected in parallel and then serve as an output end of the buffer unit to output the enable signal to the switching unit, the A1 pin and the A2 pin which are connected in parallel are further connected to GND through the resistor R12, an operating level VCC _3 is connected to a VCCB pin of the chip IC3 in parallel and then connected to a VCGND pin and a VCCB pin which are connected in parallel are further connected to GND through the capacitor C8.
The working principle of the utility model is as follows:
procedure for power-up extension of delay cells
Referring to fig. 2, after the chip IC1 operates at power-on (VCC _ 1), a low level signal is output first, and after a preset time, a high level signal is output, the CT of the chip IC1 is a timing parameter input terminal, and the delay time can be implemented by changing the capacitance value of the capacitor C1. It should be noted that the operating level VCC _1 is powered up when the main power supply branch is powered up, and is powered down when the main power supply branch is powered down.
The monitoring unit is in working state all the time in the whole system, detects the POWER voltage state of the main POWER supply branch in real time, and comprises the following processes:
1) the detection process comprises the following steps: the device is used for detecting the voltage abnormality of a main POWER supply branch, when the voltage value of the main POWER supply branch is abnormal/POWER-off, the voltage drops, when the main voltage value drops into an area near the N1 value and the monitoring unit detects that POWER is less than a preset value-Vdet (min), a chip IC2 immediately outputs a low level through an OUT pin, the low level is reversed through a triode Q2, a high level is output to a buffer unit through a collector of a triode Q2, at the moment, when an enable signal received by the buffer unit is effective, a BB _ EN is output to a switching unit through the buffer unit, so as to start the switching unit to switch on a standby POWER supply branch, the standby POWER supply branch supplies POWER for a direct current load through a diode D2, so that the load in a vehicle T-Box works normally, no gap exists in the whole switching process, the switching process is rapid and accurate, a timing diagram of the detecting process is shown in reference to figure 3, wherein POWER is the voltage of the main POWER supply branch, VSS corresponds to a reference voltage when POWER is 0V, B _ DET7V0_ IN is a level voltage output from the collector of the transistor Q2 to the buffer unit, and BB _ EN is a level voltage output from the buffer unit to the switching unit.
2) And (3) a relieving process: when the voltage of the main POWER supply branch is recovered from the abnormal state to the normal state, the voltage is IN a slowly rising state, when the voltage value enters an area near the value N2 and the monitoring unit detects that the POWER is greater than a preset value + Vdet (max), after the delay At time, the output of B _ DET7V0_ IN is low level, the output of the rear-stage buffer unit BB _ EN is also low level, the switching unit is closed, the voltage POWER supply of the standby battery is cut off, the main POWER supply branch supplies POWER for the direct current load through the diode D1, and therefore the load is guaranteed to work normally and no gap exists IN the whole switching process. The capacitor C6 is a delay selection capacitor, and the time of the delay At is adjusted by changing the capacitance value of the capacitor C6. Referring to fig. 4, IN the release timing diagram, POWER is the voltage of the main POWER supply branch, VSS corresponds to the reference voltage when POWER is 0V, B _ DET7V0_ IN is the level voltage output from the collector of the transistor Q2 to the buffer unit, and BB _ EN is the level voltage output from the buffer unit to the switching unit.
The working process of the buffer unit is as follows:
when the enable pin OE of the chip IC3 is at a high level, the pins B1 and B2 of the chip IC are isolated from the pins a1 and a2 by a high impedance, and the output terminal is provided with a pull-down resistor R12, at this time, BB _ EN is at a low level, and the switching unit is disabled. When the enable pin OE of the chip IC3 is at a low level and the DIR direction is set to a low level, at this time, the chip IC3 is in an active working data transmission state, the pins B1 and B2 are conducted to the pins a1 and a2, the input levels of the pins B1 and B2 are directly output to the pins a1 and a2, and when the outputs of the pins a1 and a2 are at a high level, that is, BB _ EN is at a high level, the switching unit is activated, and conversely, the switching unit is deactivated.
The vehicle-mounted T-Box safe power supply system adopts a hardware circuit form to monitor the voltage state of the main power supply branch in real time, is an MCU detection-free mode, can avoid the problem that a standby power supply branch cannot be switched when a bug occurs in an MCU, and can save IO port resources for controlling the MCU; meanwhile, a delayed execution mode is adopted in the releasing process, so that the voltage of the main power supply branch circuit can be prevented from being mistakenly switched due to the influence of factors such as noise, interference and the like, the reliability of a switching system is greatly improved, and the switching system is effectively ensured.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims.
Claims (8)
1. The utility model provides a vehicle-mounted T-Box safety POWER supply system, includes main POWER supply branch and the reserve POWER supply branch of the direct current load POWER supply for vehicle-mounted T-Box, main POWER supply branch is used for being connected in order to obtain main POWER with vehicle-mounted storage Battery, reserve POWER supply branch is used for being connected in order to obtain reserve POWER Battery with the built-in Battery of vehicle-mounted T-Box, its characterized in that, the system still includes delay unit, monitoring unit, buffer unit and switching unit, wherein:
the delay unit is connected with the buffer unit and is used for delaying preset time T after the main power supply branch is electrified and outputting an enabling signal to the buffer unit;
the monitoring unit is connected with the buffer unit and is used for monitoring the voltage state of the main power supply branch in real time and rapidly outputting state information to the buffer unit when the voltage of the main power supply branch is abnormal or normal;
the buffer unit is connected with the switching unit and used for allowing the state information from the monitoring unit to be received after the enable signal output by the delay unit is valid and then outputting the enable signal to the switching unit;
the switching unit is connected in series in the standby power supply branch circuit and used for starting and switching on the standby power supply branch circuit when the enable signal output by the buffer unit is effective, and switching off the standby power supply branch circuit when the enable signal output by the buffer unit is ineffective.
2. The on-board T-Box safe power supply system according to claim 1, wherein a diode D1 is connected in series in the main power supply branch, and a diode D2 is connected in series at an output terminal of the switching unit in the backup power supply branch.
3. The vehicle-mounted T-Box safety power supply system according to claim 2, wherein the delay unit comprises a chip IC1 with a model number BU4229G-TR, the chip IC1 is used for obtaining an operating level VCC1 while the main power supply branch is powered on, the chip IC1 firstly outputs a low level after obtaining the operating level VCC1, and outputs a high level after a preset delay time T, so as to serve as an enable signal output to the buffer unit.
4. The vehicle-mounted T-Box secure power supply system of claim 3, wherein the delay unit further comprises a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a triode Q1, wherein:
the CT pin of the chip IC1 is connected to GND through a capacitor C1;
the VOUT pin of the chip IC1 is divided into three paths, wherein the first path is connected to a working level VCC _1 through a resistor R2, the second path is connected to the base electrode of the triode Q1 through a resistor R3, and the third path is connected to GND through a capacitor C3;
the VOD pin of the chip IC1 is divided into two paths, wherein one path is connected to the working level VCC _1 through a resistor R1, and the other path is connected to GND through a capacitor C2;
the collector of the triode Q1 is connected with the working level VCC1, the emitter is connected to GND through the resistor R4, and the emitter is also used as the output end of the delay unit for being connected with the buffer unit to output the enable signal to the buffer unit.
5. The on-board T-Box secure POWER supply system of claim 1, wherein the monitoring unit comprises a chip IC2 model S-19110AAEA, the chip IC2 is used for monitoring the voltage status of the main POWER in the main POWER branch in real time.
6. The vehicle-mounted T-Box secure power supply system of claim 5, wherein the monitoring unit further comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a diode D3, a diode D4, a diode D5 and a triode Q2, wherein:
a VDD pin of the chip IC2 is connected to a main POWER supply branch through a resistor R5 to obtain a main POWER supply, the VDD pin is connected to an emitter of a triode Q2 through a resistor R6 and a diode D4 which are connected in sequence, a cathode of a diode D4 faces to one end of a connecting resistor R6, the VDD pin is further connected to GND through a diode D3 and a capacitor C4 respectively, and a cathode of a diode D3 faces to one end of the connecting VDD pin;
the VN pin of the chip IC2 is connected to GND through a capacitor C5;
the VSS pin of the chip IC2 is connected with GND;
the CP pin of the chip IC2 is connected to GND through a capacitor C6;
an OUT pin of the chip IC2 is connected to a base electrode of the triode Q2 through a diode D5 and a resistor R9 which are connected in sequence, and a cathode of the diode D5 faces to one end connected with the OUT pin;
an emitter of the triode Q2 is connected with a working level VCC _2, a collector of the triode Q8926 is connected to GND through a resistor R10, and the collector of the triode Q2 is also connected with the buffer unit as an output end of the monitoring unit to output state information to the buffer unit;
the two ends of the resistor R7 are respectively connected with the cathode of the diode D4 and the cathode of the diode D5, the two ends of the resistor R7 are respectively connected with the anode of the diode D4 and the anode of the diode D5, and the anode of the diode D5 is further connected to GND through the capacitor C7.
7. The on-board T-Box secure powering system according to claim 1, characterized in that said buffering unit comprises a chip IC3 of model SN74AVC2T245 RSWR.
8. The vehicle-mounted T-Box safety power supply system according to claim 7, wherein the buffer unit further comprises a resistor R11, a resistor R12 and a capacitor C8, the DIR1 pin, the DIR2 pin and the GND pin of the chip IC3 are all connected with GND, the OE pin of the chip IC3 is connected to the delay unit to input the enable signal output by the delay unit, the B1 pin and the B2 pin of the chip IC3 are connected in parallel and then connected to the monitoring unit through the resistor R11 to input the state information output by the monitoring unit, the A1 pin and the A2 pin of the chip IC3 are connected in parallel and then serve as the output end of the buffer unit to output the enable signal to the switching unit, the A1 pin and the A2 pin after being connected in parallel are further connected to GND through the resistor R12, the VCGND CA pin and the VCCB pin of the chip IC3 are connected in parallel and then connected with the working level VCC _3, and the CA VCCB pin and VCGND pin after being connected in parallel are further connected to the capacitor VCC 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122198028.9U CN215990309U (en) | 2021-09-10 | 2021-09-10 | Vehicle-mounted T-Box safe power supply system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122198028.9U CN215990309U (en) | 2021-09-10 | 2021-09-10 | Vehicle-mounted T-Box safe power supply system |
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| CN215990309U true CN215990309U (en) | 2022-03-08 |
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- 2021-09-10 CN CN202122198028.9U patent/CN215990309U/en active Active
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