Power supply system of intelligent fuse box

Abstract

A power supply system of an intelligent fuse box comprises a vehicle end power supply module, an SBC, a redundant power supply circuit, a control unit, a latch circuit, a switch control chip and a load, a first signal output end of the SBC is connected with a signal input end of the control unit, and a second signal output end of the SBC is connected with a signal input end of the redundant power supply circuit. The power supply output end of the redundant power supply circuit and the power supply output end of the SBC are connected with the power supply input end of the latch circuit, the first signal output end of the control unit is connected with the signal input end of the redundant power supply circuit, and the second signal output end of the control unit is connected with the signal input end of the latch circuit. The signal output end of the latch circuit is connected with the signal input end of the switch control chip, and the signal input end of the switch control chip is connected with a load. According to the power supply system, when the SBC or the control unit fails, the redundant power supply circuit can still be switched to supply power to the latch circuit, transmission of a power supply switch control signal is ensured, and power failure of a safety load is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent fuse boxes, and particularly relates to a power supply system for an intelligent fuse box. Background Art

[0002] Traditional distribution boxes use three major types of vehicle fuses with different rated current specifications, namely fast-blow fuses, slow-blow fuses, and plate fuses, to meet the power supply applications of different scenarios and requirements of the whole vehicle, thereby realizing the protection of the whole vehicle wiring harness and load. With the development of semiconductor technology, various new semiconductor devices such as E-fuse (electronic fuse), Mosfet, and HSD (High-Side Driver) have been gradually applied to the design of intelligent distribution-related products to achieve intelligent protection and monitoring.

[0003] As the primary power distribution management unit of a vehicle, the electronic fuse box controls the turning on and off of all power sources in the vehicle. The loads controlled by the electronic fuse box include safety-related loads and non-safety-related loads. Safety-related loads include, for example, steering, airbags, brake assist, etc., and non-safety-related loads include, for example, mobile phone wireless charging, in-vehicle refrigerators, etc. For safety-related loads, it is required that the electronic fuse box can ensure fail-safe power supply. Even if the power management chip of the electronic fuse box itself is damaged, or the MCU is damaged, the power supply to the safety-related loads cannot be interrupted.

[0004] In the existing technical solutions, dual-chip parallel power supply is usually adopted, but the dual-chip parallel power supply scheme has problems such as doubling of costs, increased power consumption, and abnormal power supply caused by interference between the two power supply chips. Summary of the Utility Model

[0005] Embodiments of the present disclosure provide a power supply system for an intelligent fuse box to at least partially solve the above problems.

[0006] The specific technical solutions provided by the embodiments of the present disclosure are as follows:

[0007] A power supply system for an intelligent fuse box is proposed, including: a vehicle-end power supply module, an SBC, a redundant power supply circuit, a control unit, a latch circuit, a switch control chip, and a load. The vehicle-end power supply module is used to supply power to the SBC, the redundant power supply circuit, and the switch control chip. The first signal output terminal of the SBC is connected to the signal input terminal of the control unit, and the second signal output terminal of the SBC is connected to the signal input terminal of the redundant power supply circuit. The power supply output terminal of the redundant power supply circuit and the power supply output terminal of the SBC are both connected to the power supply input terminal of the latch circuit. The first signal output terminal of the control unit is connected to the signal input terminal of the redundant power supply circuit, and the second signal output terminal of the control unit is connected to the signal input terminal of the latch circuit. The signal output terminal of the latch circuit is connected to the signal input terminal of the switch control chip, and the signal input terminal of the switch control chip is connected to the load.

[0008] Preferably, the SBC is communicatively connected to the control unit, and the SBC is configured to feedback power anomaly data information to the control unit when any one of the multiple power outputs of the SBC is detected to be abnormal.

[0009] Preferably, when any one of the multiple power outputs of the SBC is detected to be abnormal, the SBC is configured to cut off the power supply to the peripheral working circuit of the SBC and output a first control signal to the control unit and the redundant power supply circuit respectively. The control unit is configured to output a power control signal to the redundant power supply circuit according to the first control signal, and the redundant power supply circuit is configured to switch from the off state to the working state according to the first control signal and the power control signal to turn on the power supply to the latch circuit.

[0010] Preferably, the latch circuit is used to latch the power supply switch control signal for controlling the conduction of the line where the load that needs continuous power supply is located, and control the switch control chip to conduct according to the power supply switch control signal, so that the vehicle-end power supply module supplies power to the load that needs continuous power supply.

[0011] Preferably, a power boost circuit is also provided between the vehicle-end power supply module and the SBC.

[0012] Preferably, the redundant power supply circuit includes an AND gate chip, a switch module, and a step-down power supply chip. The first input terminal of the AND gate chip is connected to the second signal output terminal of the SBC, the second input terminal of the AND gate chip is connected to the first signal output terminal of the control unit, the output terminal of the AND gate chip is connected to the input terminal of the switch module, and the output terminal of the switch module is connected to the enable pin of the step-down power supply chip.

[0013] Preferably, the switch module includes a first triode and a first field-effect transistor. The base of the first triode is connected to the output terminal of the AND gate chip, the emitter of the first triode is connected to the load power supply voltage, and the collector of the first triode is grounded; the gate of the first field-effect transistor is connected between the emitter of the first triode and the load power supply voltage, the source of the first field-effect transistor is grounded, and the drain of the first field-effect transistor is connected to the enable pin.

[0014] According to the power supply system of the intelligent fuse box in this article, when the SBC or the control unit fails, it can still be switched to the redundant power supply circuit to supply power to the latch circuit, ensuring the transmission of the power supply switch control signal, making the switch control chip continuously conduct, and the vehicle-end power supply module continuously supply power to the safety-related loads to avoid power-off. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a structural block diagram of the power supply system of the intelligent fuse box according to the preferred embodiment of the present disclosure.

[0017] Figure 2 It is a circuit schematic diagram of the SBC and its peripheral working circuit according to the preferred embodiment of the present disclosure.

[0018] Figure 3 It is a circuit schematic diagram of the redundant power supply circuit according to the preferred embodiment of the present disclosure.

[0019] Figure 4 It is a circuit schematic diagram of the power boost circuit according to the preferred embodiment of the present disclosure.

[0020] Figure 5 It is a circuit schematic diagram of the latch circuit according to the preferred embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following describes the preferred embodiments of the present disclosure with reference to the accompanying drawings of the specification. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure. And without conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0022] As Figure 1 shown, the present disclosure provides a power supply system of an intelligent fuse box according to a preferred embodiment, including: a vehicle-end power supply module (which can be understood asFigure 1 The battery or DCDC power supply), SBC (System Basis Chip), redundant power supply circuit, control unit, latch circuit, switch control chip and load. The vehicle-end power supply module is used to supply power to the SBC, redundant power supply circuit and switch control chip. The first signal output terminal of the SBC is connected to the signal input terminal of the control unit, the second signal output terminal of the SBC is connected to the signal input terminal of the redundant power supply circuit, the power supply output terminal of the redundant power supply circuit and the power supply output terminal of the SBC are both connected to the power supply input terminal of the latch circuit, the first signal output terminal of the control unit is connected to the signal input terminal of the redundant power supply circuit, the second signal output terminal of the control unit is connected to the signal input terminal of the latch circuit, the signal output terminal of the latch circuit is connected to the signal input terminal of the switch control chip, and the signal input terminal of the switch control chip is connected to the load.

[0023] Figure 2 The circuit schematic diagram of the SBC and its peripheral working circuit of the preferred embodiment of the present disclosure. The main power supply of the electronic fuse box in this embodiment uses an SBC chip that meets the requirements of functional safety certification. The SBC basically has the following conventional functions: 1. Reduce the DCDC or automotive battery voltage to the working voltage of the single-chip microcomputer (for example: 5V / 3.3V); 2. Monitor abnormal problems such as overcurrent, overvoltage, and undervoltage of the output voltage and store them in an independent safety module; 3. Turn off the output and send a safety signal (that is, the first control signal described below) when the chip works abnormally; 4. Have a multi-channel step-down output function.

[0024] As Figure 2 shown, the multi-channel power supplies output by the SBC include analog power supply (5VA), MCU power supply (MCU-5V), load power supply (5VB), and chip core power supply (MCU-1V5). When the independent safety module inside the chip detects any abnormal load output, it will turn off the output of the SBC, and the independent safety module will send a safety signal (which can be understood as the first control signal below). That is, the output pins FS0B and FS1B of the SBC will change from high level to low level.

[0025] Specifically, the SBC is configured to cut off the power supply of the SBC peripheral working circuit and output the first control signal to the control unit and the redundant power supply circuit respectively when detecting any abnormality in the multi-channel power supply output of the SBC. The control unit is configured to output a power control signal to the redundant power supply circuit according to the first control signal. The redundant power supply circuit is configured to switch from the off state to the working state according to the first control signal and the power control signal to turn on the power supply to the latch circuit. Thus, when the SBC is abnormal, the redundant power supply circuit is switched to supply power to the latch circuit.

[0026] In some embodiments, further, the latching circuit is configured to latch a power supply switch control signal for controlling the conduction of the line where the load that requires continuous power supply is located, and control the conduction of the switch control chip according to the power supply switch control signal, so that the vehicle-end power supply module supplies power to the load that requires continuous power supply.

[0027] Specifically, as Figure 5 shown, the power supply voltage input of the latching circuit is divided into two paths. One path is the load power supply voltage 5VB provided by the SBC, and the other path is the power supply voltage 5VRY provided by the redundant power supply circuit. In the normal state of the SBC, it is powered by the load power supply voltage 5VB. The load power supply voltage 5VB supplies power to the latch U14 through the diode D10. The power supply voltage 5VRY provided by the redundant power supply circuit is turned on after the load power supply voltage 5VB fails and supplies power to the latch U14. There is a certain time t for the power supply switching between the two. During the time t, the capacitor C105 supplies power to the latch U14 to prevent the loss of latched data. When the single-chip microcomputer (control unit) fails or the SBC fails, resulting in the power-off of the single-chip microcomputer, the power supply switch control signal related to safety can maintain the signal level state before failure through the latch U14.

[0028] Thus, even if the SBC is abnormal, there is still a redundant power supply circuit to supply power to the latching circuit. The latching circuit always latches the power supply switch control signal sent by the control unit. Even if the control unit is damaged, the latching circuit can still continuously output a signal to control the conduction of the switch control chip, ensuring that the vehicle-end power supply module supplies power to the load that requires continuous power supply.

[0029] Preferably, in some embodiments, the SBC can be communicatively connected to the control unit. The SBC is configured to, when detecting an abnormality in any one of the multiple power outputs of the SBC, feed back power abnormality data information to the control unit. For example, inform the control unit of problems such as power supply faults or other under-voltage and over-current issues of the SBC.

[0030] As Figure 3 shown, the redundant power supply circuit includes an AND gate chip U9, a switch module, and a buck power supply chip U2. The first input terminal of the AND gate chip U9 is connected to the second signal output terminal of the SBC, the second input terminal of the AND gate chip U9 is connected to the first signal output terminal of the control unit, the output terminal of the AND gate chip U9 is connected to the input terminal of the switch module, and the output terminal of the switch module is connected to the enable pin EN of the buck power supply chip U9.

[0031] More specifically, the switch module includes a first triode Q6 and a first field effect transistor Q69. The base of the first triode Q6 is connected to the output terminal of the AND gate chip U9. The emitter of the first triode Q6 is connected to the load power supply voltage 5VB. The collector of the first triode Q6 is grounded. The gate of the first field effect transistor Q69 is connected between the emitter of the first triode Q6 and the load power supply voltage 5VB. The source of the first field effect transistor Q69 is grounded. The drain of the first field effect transistor Q69 is connected to the enable pin EN.

[0032] As Figure 4 shown, a power boost circuit can also be provided between the vehicle-end power supply module and the SBC. The automotive battery power supply or the DCDC power supply enters the power supply circuit of the SBC through the diode D7 after filtering. Since the input voltage value of the automotive voltage is a floating value (9V - 16V), the function of this circuit is to boost the voltage of 9V - 16V or lower to a higher stable voltage value (VSUP), connect the VSUP voltage to the power input terminal of the SBC, and supply power to the SBC.

[0033] Next, in combination with Figures 1 to 5 , the working principle of the system will be described in detail.

[0034] During normal operation, when the power is turned on, the output pin FS0B of the SBC outputs a high level. After the control unit (MCU) is started, the pin MCU-RYEN of the MCU also outputs a high level. After being processed by the AND gate chip U9, the output pin RYEN of the AND gate chip U9 outputs a high level. When the output pin RYEN is at a high level, the first triode Q6 is turned off, and the first field effect transistor Q69 is turned on. The enable pin EN of the buck power supply chip U2 is grounded through the first field effect transistor Q69, which plays a role in low power consumption, and the buck power supply chip U2 does not work. Therefore, the SBC and the buck power supply chip U2 do not work simultaneously, avoiding interference between each other.

[0035] When a working anomaly occurs, the SBC will enter a protection state and turn off all load outputs. The MCU will also lose power. However, there is an independent safety module inside the SBC. The hardware protection pin of the safety module, that is, the output pin FS0B changes from a high level to a low level. After being processed by the AND gate chip U9, the output pin RYEN of the AND gate chip U9 outputs a low level. When the output pin RYEN is at a low level, the first triode Q6 is turned on, and the first field effect transistor Q69 is turned off. The enable pin EN of the buck power supply chip U2 is at a high level, and the buck power supply chip U2 switches from the off state to the working state to supply power to the latch circuit and the switch control chip. When the fault is restored, the signal of the output pin FS0B of the SBC becomes a high level, and the buck power supply chip U2 is turned off, avoiding interference between the power supplies.

[0036] According to the power supply system of the intelligent fuse box in this article, when the SBC or the control unit fails, it can still be switched to the redundant power circuit to supply power to the latch circuit, ensuring the transmission of the power supply switch control signal, making the switch control chip continuously conduct, and the vehicle-end power supply module continuously supply power to the safety-related loads to avoid power-off.

[0037] Although the preferred embodiments of the present disclosure have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present disclosure.

[0038] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present disclosure without departing from the spirit and scope of the embodiments of the present disclosure. Thus, if these modifications

[0039] and variations of the embodiments of the present disclosure fall within the scope of the claims of the present disclosure and their equivalent technologies, the present disclosure also intends to include these changes and variations.

[0040] It should also be understood that in the embodiments of this article, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this article, the character " / " generally represents an "or" relationship between the associated objects before and after.

[0041] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in this article can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are implemented in hardware or software

[0042] depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this article.

[0043] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated here.

[0044] The units described as separate components may or may not be physically separated. As

[0045] The component for unit display may or may not be a physical unit, that is, it may be located in one place or distributed across multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments herein.

[0046] In addition, each functional unit in the embodiments herein can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0047] Specific embodiments are used herein to elaborate on the principles and implementation manners of the present text. The description of the above embodiments is only used to help understand the method and its core idea herein; at the same time, for those of ordinary skill in the art, according to the idea herein, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present text.

Claims

1. A power supply system for an intelligent fuse box, characterized in that: include: A vehicle-side power supply module, an SBC, a redundant power supply circuit, a control unit, a latch circuit, a switch control chip and a load. The vehicle-side power supply module is used to supply power to the SBC, the redundant power supply circuit and the switch control chip. The first signal output end of the SBC is connected to the signal input end of the control unit, the second signal output end of the SBC is connected to the signal input end of the redundant power supply circuit, the power supply output end of the redundant power supply circuit and the power supply output end of the SBC are both connected to the power supply input end of the latch circuit, the first signal output end of the control unit is connected to the signal input end of the redundant power supply circuit, the second signal output end of the control unit is connected to the signal input end of the latch circuit, the signal output end of the latch circuit is connected to the signal input end of the switch control chip, and the signal input end of the switch control chip is connected to the load.

2. The power supply system of the smart fuse box according to claim 1, characterized in that: The SBC is in communication connection with the control unit, and the SBC is configured to feed back power supply abnormality data information to the control unit when an abnormality is detected in any of the multiple power supply outputs of the SBC.

3. The power supply system of the smart fuse box according to claim 1, characterized in that: The SBC is configured to cut off the power supply to the SBC peripheral working circuit when an abnormality is detected in any of the multiple power outputs of the SBC, and output a first control signal to the control unit and the redundant power supply circuit respectively. The control unit is configured to output a power control signal to the redundant power supply circuit according to the first control signal. The redundant power supply circuit is configured to switch from a closed state to a working state according to the first control signal and the power control signal to start power supply to the latch circuit.

4. The power supply system of the smart fuse box according to claim 1, characterized in that: The latch circuit is used to latch the power switch control signal that controls the conduction of the circuit where the load that requires continuous power supply is located, and controls the conduction of the switch control chip according to the power switch control signal, so that the vehicle-end power supply module can supply power to the load that requires continuous power supply.

5. The power supply system of the smart fuse box according to claim 1, characterized in that: A power boost circuit is also provided between the vehicle-end power supply module and the SBC.

6. The power supply system of the smart fuse box according to claim 1, characterized in that: The redundant power supply circuit includes an AND gate chip, a switch module and a step-down power supply chip, wherein the first input end of the AND gate chip is connected to the second signal output end of the SBC, the second input end of the AND gate chip is connected to the first signal output end of the control unit, the output end of the AND gate chip is connected to the input end of the switch module, and the output end of the switch module is connected to the enable pin of the step-down power supply chip.

7. The power supply system of the smart fuse box according to claim 6, characterized in that: The switch module includes a first transistor and a first field effect transistor, the base of the first transistor is connected to the output end of the AND gate chip, the emitter of the first transistor is connected to the load power supply voltage, and the collector of the first transistor is grounded; the gate of the first field effect transistor is connected between the emitter of the first transistor and the load power supply voltage, the source of the first field effect transistor is grounded, and the drain of the first field effect transistor is connected to the enable pin.

Images