Low-power-consumption input circuit

Abstract

The utility model provides a low-power-consumption input circuit, and the circuit comprises a power supply input module which comprises a switch unit, and the switch unit is disposed at the output end of the power supply input module; the output end of the power supply module is connected with each electric circuit in the vehicle, the input end of the power supply module is connected with the output end of the switch unit, and the on-off of the input end of the power supply module is controlled through the switch unit; the control module is connected with the power supply module; the awakening module is connected with the control end of the switch unit, and the input end of the awakening module is connected with the dormancy control end of the control module and the input end of an external awakening signal. The awakening module is connected with the power supply input module and the control module, the power supply input module is controlled to be switched on and off according to signals of the dormancy control end and the external awakening signal input end of the control module, the basic awakening function is kept while power consumption of the rear end is reduced, and then damage of dark current to the storage battery is reduced.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicles, and in particular to a low-power input circuit. Background Art

[0002] The existing power input circuit implements the product sleep or wake-up mode management and control strategy under the static working conditions of the whole vehicle. The main control MCU (microcontroller unit) sends a sleep command to the SBC (System Basis Chip) power chip. After receiving the signal, the SBC power chip disconnects the power supply and enters sleep mode. This process requires that the power supply path of the SBC power supply be kept continuously connected. Since the SBC power chip is continuously connected to the external power supply, it cannot enter sleep mode completely, resulting in a large dark current in the whole vehicle. Utility Model Content

[0003] In view of the above problems in the prior art, the present invention proposes a low-power input circuit, which mainly solves the problem that the existing power supply system has a large dark current in the sleep or wake-up mode, thereby affecting the battery life.

[0004] In order to achieve the above-mentioned and other purposes, the technical solutions adopted by the present invention are as follows.

[0005] The present application provides a low-power input circuit, comprising: a power supply input module, which includes a switch unit, and the switch unit is arranged at the output end of the power supply input module; a power supply module, whose output end is connected to various power circuits inside the vehicle, and the input end of the power supply module is connected to the output end of the switch unit, and the switching unit is used to control the opening and closing of the input end of the power supply module; a control module, which is connected to the power supply module; and a wake-up module, which is connected to the control end of the switch unit, and the input end of the wake-up module is respectively connected to the sleep control end and the external wake-up signal input end of the control module.

[0006] In one embodiment of the present application, the power supply input module includes a power input terminal, a ground terminal, and a first capacitor and a first diode arranged between the power input terminal and the ground terminal, wherein the first capacitor is connected in parallel with the first diode, the input terminal of the switching unit is connected to the power input terminal, and the output terminal of the switching unit is connected to the power module; the input terminal of the switching unit is connected to the cathode of the second diode, and the output terminal of the switching unit is connected to the anode of the second diode.

[0007] In one embodiment of the present application, the switching unit includes an NMOS transistor, the source of the NMOS transistor serves as the input end of the switching unit, the drain of the NMOS transistor serves as the output end of the switching unit, and the gate of the NMOS transistor serves as the control end of the switching unit.

[0008] In an embodiment of the present application, a third diode is provided between the input terminal of the wake-up module and the sleep control terminal.

[0009] In an embodiment of the present application, a fourth diode is provided between the input end of the wake-up module and the external wake-up signal input end.

[0010] In an embodiment of the present application, the circuit further includes a DC controller, an output end of the DC controller serves as the power input end, and a control end of the DC controller is connected to the external wake-up signal input end.

[0011] In an embodiment of the present application, the wake-up module and the power input module are integrated into one chip.

[0012] In one embodiment of the present application, the second diode includes a transient voltage suppressor diode.

[0013] In an embodiment of the present application, the power input terminal, the wake-up module, and the switch unit form a power supply path.

[0014] In one embodiment of the present application, the control module includes an MCU.

[0015] As described above, the low-power input circuit provided by the present application has the following beneficial effects.

[0016] This application sets up a wake-up module to connect the power supply input module and the control module, and controls the opening and closing of the power supply input module according to the signals from the sleep control end of the control module and the external wake-up signal input end, thereby reducing the power consumption of the back-end while maintaining the basic wake-up function, thereby reducing the harm of dark current to the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the circuit structure of a low-power input circuit in one embodiment of the present application.

[0018] Description of Figure Numbers:

[0019] 01-power input module; 02-power module; 03-power circuit; 04-control module; 05-wake-up module; VBAT-power input terminal; C1-first capacitor; Z1-first diode; D2-second diode; D3-third diode; D4-fourth diode; Q1-switch unit. DETAILED DESCRIPTION

[0020] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0021] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0022] The inventors have discovered that the existing 12V power system input executes the sleep and wake-up mode management and control strategy for the product under static vehicle conditions. The specific process is as follows: the MCU sends a sleep command to the SBC (System Basic Chip) power chip. After receiving the signal, the SBC disconnects the power supply and enters sleep mode; the wake-up is performed by an external wake-up source (12V power hard line, CP signal, VCU signal, MCU voltage maintenance, CC1 signal, NTC signal, etc.) to wake up the power supply SBC, and the SBC power chip wakes up the MCU.

[0023] In the above sleep scheme, the input front-end MOS switch tube is in the on state, and the SBC power chip cannot be fully put into sleep due to power supply, which cannot reduce the dark current of the entire vehicle and has a great impact on the battery life.

[0024] Current solutions only consider the dark current of individual components. However, a vehicle has numerous controllers. This results in a significant accumulation of dark currents. This, combined with the natural discharge of the battery, can lead to insufficient battery capacity when the vehicle is parked for extended periods, resulting in a vehicle failure. This high dark current continuously depletes battery voltage, shortening the vehicle's battery life and usage cycle.

[0025] In view of the above problems existing in the prior art, the present application proposes a low-power input circuit. The technical solution of the present application is described in detail below in conjunction with specific embodiments.

[0026] See also Figure 1 , Figure 1This is a schematic diagram of the circuit structure of a low-power input circuit in an embodiment of the present application. The low-power input circuit provided in the embodiment of the present application includes: a power supply input module 01, which includes a switch unit Q1, and the switch unit Q1 is set at the output end of the power supply input module 01; a power supply module 02, whose output end is connected to each power circuit 03 inside the vehicle, and the input end of the power supply module 02 is connected to the output end of the switch unit Q1, and the switching of the input end of the power supply module 02 is controlled by the switch unit Q1; a control module 04, which is connected to the power supply module 02; a wake-up module 05, which is connected to the control end of the switch unit Q1, and the input end of the wake-up module 05 is respectively connected to the sleep control end and the external wake-up signal input end of the control module 04. Specifically, the power supply input module 01 can be connected to a 12V power supply, and the 12V power supply inputs the power supply voltage to the power input end VBAT of the power supply input module 01. After the power supply voltage flows from the input end of the power supply input module 01 through the wake-up module 05 and the switch unit Q1, it supplies power to the power supply module 02. The wake-up module 05 can control the on and off of the switch unit Q1, that is, in the sleep mode, the switch unit Q1 can be controlled to be turned off to cut off the power supply to the power module 02; in the wake-up mode, the control module 04 can provide a wake-up signal to the wake-up module 05, and then the wake-up module 05 controls the switch unit Q1 to be turned on to supply power to the power module 02.

[0027] In one embodiment, the power input module 01 includes a power input terminal VBAT, a ground terminal, and a first capacitor C1 and a first diode Z1 disposed between the power input terminal VBAT and the ground terminal. The first capacitor C1 and the first diode Z1 are connected in parallel. The input terminal of the switch unit Q1 is connected to the power input terminal VBAT, and the output terminal of the switch unit Q1 is connected to the power module 02. The input terminal of the switch unit Q1 is connected to the cathode of a second diode D2, and the output terminal of the switch unit Q1 is connected to the anode of the second diode D2. Specifically, one end of the first capacitor C1 is connected to the power input terminal VBAT of the power input module 01, and the other end is grounded. One end of the first diode Z1 is connected to the power input terminal VBAT of the power input module 01, and the other end is grounded. The input terminal of the switch unit Q1 is connected to the power input terminal VBAT of the power input module 01, the output terminal is connected to the input terminal of the power module 02, and the control terminal is connected to the output terminal of the wake-up module 05. The wake-up module 05 controls the on / off state of the switch unit Q1. A second diode D2 is provided on the switch unit Q1 to prevent reverse operation. The power input terminal VBAT of the power input module 01 is also connected to the power terminal of the wake-up module 05 , and receives a DC voltage provided externally to drive the wake-up module 05 to work.

[0028] In one embodiment, the first diode Z1 may be a transient voltage suppressor (TVS) diode.

[0029] In one embodiment, the switch unit Q1 can be an NMOS transistor, with the source of the NMOS transistor serving as the input terminal of the switch unit Q1, the drain of the NMOS transistor serving as the output terminal of the switch unit Q1, and the gate of the NMOS transistor serving as the control terminal of the switch unit Q1. Using an NMOS transistor in conjunction with the wake-up module 05 can increase the load current and protect subsequent circuits and modules.

[0030] In one embodiment, a third diode D3 is provided between the input terminal of the wake-up module 05 and the sleep control terminal of the control module 04. Specifically, the anode of the third diode D3 is connected to the sleep control terminal, and the cathode is connected to the input terminal of the wake-up signal. The third diode D3 can prevent reverse connection and protect the circuit.

[0031] In one embodiment, a fourth diode D4 is provided between the input terminal of the wake-up module 05 and the external wake-up signal input terminal. The fourth diode D4 can also play a role in preventing reverse connection and is used to protect the circuit.

[0032] In one embodiment, the wake-up module 05 may adopt a power management chip, which generates a control level output after receiving an external input voltage. The selection of a specific power management chip can be set and adjusted according to actual application requirements and is not limited here. The wake-up module 05 can also be integrated with the power supply input module 01 in one chip to reduce the module's occupation of the circuit layout area and reduce wiring complexity. In another embodiment, the wake-up module 05 can also be integrated into one chip only with the switching unit Q1, and the integrated chip and the peripheral circuit together constitute the power supply input module 01. Among them, the peripheral circuit may include a first capacitor C1, a first diode Z1, a second diode D2, etc.

[0033] In one embodiment, the power module 02 may be a System Basis Chip (SBC) power chip, which supplies power to the internal power circuits 03 on the vehicle side.

[0034] In one embodiment, the control module 04 may be an MCU (Microcontroller Unit). In normal working mode, the power supply voltage flows from the power input terminal VBAT of the power supply input module 01, passes through the first capacitor C1 and the first diode Z1, and is supplied to the wake-up module 05. The wake-up module 05 drives the switch unit Q1 to turn on, so that the current flows to the power module 02, and then flows back to the product ground from the power module 02. That is, the power input terminal VBAT of the power supply input module 01, the wake-up module 05, and the switch unit Q1 form a power supply path for the power module 02. The power module 02 receives the power supply voltage and completes power-on. After power-on, the power module 02 can supply power to the control module 04 to wake up the control module 04. In one embodiment, the power supply voltage can be a 12V power supply voltage. Of course, the specific power supply voltage can also be set and adjusted according to actual application requirements, which is not limited here.

[0035] When the vehicle is turned off or parked for an extended period, it enters sleep mode. The vehicle controller sends a sleep command to control module 04. Upon receiving the sleep command, control module 04 sends a voltage level to the wakeup chip via the sleep control terminal. The wakeup chip then controls switch unit Q1 to disconnect, halting power supply to power module 02. Power module 02 and its downstream power circuit 03 also enter sleep mode. Control module 04 enters a low-power sleep mode, which reduces dark current by cutting off power to downstream power circuit 03.

[0036] In the wake-up mode, when the vehicle needs to exit the sleep state, the vehicle controller can input a wake-up signal to the wake-up module 05 through the external wake-up signal input terminal. The wake-up module 05 controls the switch unit Q1 to turn on, so that the power supply path of the power module 02 is turned on and continues to supply power to the power module 02.

[0037] In one embodiment, the power supply voltage for the power input module 01 can also be provided by a DC controller. The output terminal of the DC controller serves as the power input terminal VBAT, and the control terminal of the DC controller is connected to the external wake-up signal input terminal. The DC controller can perform power supply and wake-up operations. The DC controller is connected to the vehicle battery and converts the battery voltage into a 12V supply voltage, which is input to the power input module 01.

[0038] Based on the technical solutions of the above embodiments of the present application, when the vehicle state switches from normal state to sleep state, the power input of the power module 02 is shut down and controlled by the switch unit Q1, reducing the power consumption of the back end of the power module 02 and maintaining only the most basic wake-up function, which can reduce the harm of dark current to the battery and ensure the reliability of the entire vehicle.

[0039] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A low power input circuit, characterized in that: include: A power supply input module, comprising a switch unit, wherein the switch unit is arranged at an output end of the power supply input module; A power module, whose output end is connected to various power circuits inside the vehicle, and whose input end is connected to the output end of the switch unit, and the switching unit controls the opening and closing of the input end of the power module; a control module connected to the power module; The wake-up module is connected to the control end of the switch unit, and the input end of the wake-up module is respectively connected to the sleep control end of the control module and the external wake-up signal input end.

2. The low-power input circuit according to claim 1, characterized in that: The power supply input module includes a power input terminal, a ground terminal, and a first capacitor and a first diode arranged between the power input terminal and the ground terminal, wherein the first capacitor is connected in parallel with the first diode, the input terminal of the switch unit is connected to the power input terminal, and the output terminal of the switch unit is connected to the power module; the input terminal of the switch unit is connected to the cathode of the second diode, and the output terminal of the switch unit is connected to the anode of the second diode.

3. The low-power input circuit according to claim 2, characterized in that: The switch unit includes an NMOS transistor, a source of the NMOS transistor serves as an input terminal of the switch unit, a drain of the NMOS transistor serves as an output terminal of the switch unit, and a gate of the NMOS transistor serves as a control terminal of the switch unit.

4. The low power input circuit according to claim 1, wherein: A third diode is provided between the input end of the awakening module and the sleep control end.

5. The low power input circuit according to claim 1, characterized in that: A fourth diode is provided between the input end of the wake-up module and the external wake-up signal input end.

6. The low power input circuit according to claim 2, characterized in that: The circuit further includes a DC controller, an output end of the DC controller serves as the power input end, and a control end of the DC controller is connected to the external wake-up signal input end.

7. The low-power input circuit according to claim 1, characterized in that: The wake-up module and the power input module are integrated into one chip.

8. The low power input circuit according to claim 2, characterized in that: The second diode comprises a transient voltage suppressor diode.

9. The low power input circuit according to claim 2, characterized in that: The power input terminal, the wake-up module and the switch unit form a power supply path.

10. The low power input circuit according to claim 1, characterized in that: The control module includes an MCU.

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