A power supply voltage sampling circuit, a power supply device, and a vehicle

Abstract

Embodiments of the present application provide a power supply voltage sampling circuit, a power supply device and a vehicle. The power supply voltage sampling circuit is electrically connected with a power module of a vehicle control system, and the power module of the vehicle control system is electrically connected with a first power supply. The first power supply provides power for the power module. The power supply voltage sampling circuit comprises a first controllable switch and a voltage dividing module. The voltage dividing module is electrically connected with the first power supply through the first controllable switch. Based on an effective signal output by the power module, the first controllable switch is in a first state, and the first controllable switch in the first state makes a pass between the voltage dividing module and the first power supply. Based on an ineffective signal output by the power module, the first controllable switch is in a second state, and the first controllable switch in the second state makes a break between the voltage dividing module and the first power supply.

Description

Technical Field

[0001] This application relates to the automotive field, and more particularly to a power supply voltage sampling circuit, a power supply device, and a vehicle. Background Technology

[0002] To ensure vehicle performance, the power supply performance of the vehicle control system needs to be monitored after the vehicle is powered on. For example, the power voltage of the vehicle control system needs to be monitored after the vehicle is powered on, and the battery level is determined by the power voltage. When the battery level is low, the driver is reminded to replace the battery or top up the battery.

[0003] To improve battery range, vehicle manufacturers strictly control the vehicle's dark current, that is, the current after the vehicle is powered off. The power sampling circuit of the vehicle control system often samples the power through a voltage divider resistor. Current continues to flow through the voltage divider resistor after the vehicle is powered off, which causes battery drain. If the vehicle is parked for a long time, the battery will be depleted and it will not be able to start normally. Summary of the Invention

[0004] In view of this, embodiments of this application provide a power supply voltage sampling circuit, a power supply device, and a vehicle, aiming to solve the problem of dark current in the power supply voltage sampling circuit after the vehicle is powered off.

[0005] In a first aspect, a power supply voltage sampling circuit is provided, wherein the power supply voltage sampling circuit is electrically connected to a power module of a vehicle control system, and the power module of the vehicle control system is electrically connected to a first power source. The first power source provides power to the power module. The power supply voltage sampling circuit includes a first controllable switch and a voltage divider module. The voltage divider module is electrically connected to the first power source through the first controllable switch. Based on a valid signal output by the power module, the first controllable switch is in a first state, which establishes a circuit between the voltage divider module and the first power source. Based on an invalid signal output by the power module, the first controllable switch is in a second state, which establishes an open circuit between the voltage divider module and the first power source.

[0006] In one possible implementation of the first aspect, it further includes: a switch control module for controlling the first controllable switch, wherein the switch control module is electrically connected to the power supply module.

[0007] The first controllable switch being in a first state based on a valid signal output by the power module includes: the switch control module controlling the first controllable switch to be in the first state based on a valid signal output by the power module.

[0008] The first controllable switch being in the second state based on the power module outputting an invalid signal includes: the switch control module controlling the first controllable switch to be in the second state based on the power module outputting a valid signal.

[0009] In one possible implementation of the first aspect, the switch control module includes: a first voltage divider branch and a first transistor. The first voltage divider branch is electrically connected to the power supply module, and the first voltage divider branch includes a first voltage divider resistor and a second voltage divider resistor. The control terminal of the first transistor is electrically connected to the node between the first voltage divider resistor and the second voltage divider resistor. A first terminal of the first transistor is electrically connected to the first power supply through a voltage divider current-limiting branch. A second terminal of the first transistor is electrically connected to ground. The voltage divider current-limiting branch includes a third resistor and a fourth resistor. The node between the third resistor and the fourth resistor is electrically connected to the control terminal of the first controllable switch.

[0010] In one possible implementation of the first aspect, the first controllable switch includes a transistor, and / or the first transistor is a transistor.

[0011] In one possible implementation of the first aspect, the first controllable switch includes a field-effect transistor, and / or the first transistor is a field-effect transistor.

[0012] In one possible implementation of the first aspect, the first controllable switch is a relay switch.

[0013] In one possible implementation of the first aspect, the control coil of the relay is connected in series with the current-limiting resistor, one end of the series branch formed by the relay control coil and the current-limiting resistor is electrically connected to the power module, and the other end of the series branch is electrically connected to the ground.

[0014] In one possible implementation of the first aspect, the first controllable switch includes a field-effect transistor (FET), the control terminal of which is electrically connected to the power supply module, the first terminal of which is electrically connected to the first power supply, and the second terminal of which is electrically connected to the voltage divider module.

[0015] Secondly, embodiments of this application also provide a power supply device, including the power supply voltage sampling circuit provided in the first aspect.

[0016] Thirdly, embodiments of this application also provide a vehicle, the vehicle including the power supply voltage sampling circuit provided in the first aspect. Or the vehicle includes a power supply device provided in the second aspect.

[0017] The power supply voltage sampling circuit provided in this application embodiment, after the vehicle system is powered on, the power module 002 outputs a valid signal, the first controllable switch 110 is in a first state, and the voltage divider module 120 and the first power supply 001 are connected, allowing the microprocessor in the vehicle control system to monitor the performance of the first power supply 001. After the vehicle system is powered off, the power module 002 outputs an invalid signal, the first controllable switch 110 is in a second state, and the voltage divider module 120 and the first power supply 001 are disconnected. This avoids leakage current in the voltage divider module after the vehicle is powered off, saving battery power consumption. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a power supply voltage sampling circuit provided for an embodiment of this application;

[0020] Figure 2 A schematic diagram of a power supply voltage sampling circuit provided for an embodiment of this application;

[0021] Figure 3 A schematic diagram of a power supply voltage sampling circuit provided for an embodiment of this application;

[0022] Figure 4 A schematic diagram of a power supply voltage sampling circuit provided for an embodiment of this application;

[0023] Figure 5 A schematic diagram of a power supply voltage sampling circuit provided for an embodiment of this application;

[0024] Figure 6 A schematic diagram of a power supply voltage sampling circuit provided for an embodiment of this application;

[0025] Figure 7 A schematic diagram of a power supply voltage sampling circuit and a wake-up circuit in a vehicle provided in this application embodiment.

[0026] 001, First power supply; 002, Power supply module; 003, Microprocessor; 100, Power supply voltage sampling circuit; 110, First controllable switch; 120, Voltage divider module; 130, Switch control module; 131, First voltage divider branch; 132, First transistor; 133, Voltage divider current limiting branch. Detailed Implementation

[0027] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0028] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0029] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0030] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0031] like Figure 1 As shown, this application embodiment provides a power supply voltage sampling circuit 100, which is used to monitor a first power supply 001, particularly for real-time monitoring of the first power supply 001 after the vehicle system is powered on. The power supply voltage sampling circuit 100 is electrically connected to a power module 002. The power module 002 is electrically connected to a microprocessor 003 and provides power to the microprocessor 003. The power module 002 includes a power conversion circuit, which converts the power supply voltage of the first power supply 001 to the target voltage required by the microprocessor 003, such as 5V or 3V. The power module 002 is electrically connected to the first power supply 001. The first power supply 001 provides power to the power module 002. In one possible implementation, the first power supply 001 is a 12V storage battery. It should be noted that the above description of the first power supply as a 12V storage battery is merely illustrative and not limiting; the first power supply 001 can also be other forms of power, such as a 24V storage battery or an auxiliary battery in an electric vehicle.

[0032] like Figure 1As shown, the power supply voltage sampling circuit 100 includes a first controllable switch 110 and a voltage divider module 120. The voltage divider module 120 is electrically connected to the first power supply 001 through the first controllable switch 110. Based on the valid signal output by the power supply module 002, the first controllable switch 110 is in a first state, which establishes a path between the voltage divider module 120 and the first power supply 001. In one possible implementation, the valid signal can be the presence of an electrical signal or an electrical signal with a voltage or current greater than a preset threshold.

[0033] Based on the invalid signal output by the power module 002, the first controllable switch 110 is in the second state, which disconnects the voltage divider module 120 from the first power supply 001. The invalid signal can be the absence of an electrical signal or the absence of an electrical signal with a voltage or current less than a preset threshold.

[0034] In this embodiment, the voltage divider module 120 and the first power supply 001 are controlled to be either connected or disconnected via the first controllable switch 110. Specifically, after the vehicle system is powered on, the power module 002 outputs a valid signal, the first controllable switch 110 is in a first state, and the voltage divider module 120 and the first power supply 001 are connected, allowing the microprocessor in the vehicle control system to monitor the performance of the first power supply 001. After the vehicle system is powered off, the power module 002 outputs an invalid signal, the first controllable switch 110 is in a second state, and the voltage divider module 120 and the first power supply 001 are disconnected. This avoids leakage current in the voltage divider module after the vehicle is powered off, saving battery power consumption.

[0035] like Figure 2 or Figure 3 As shown, in one embodiment of this application, the power supply voltage sampling circuit 100 further includes a switch control module 130. The switch control module 130 is used to control the first controllable switch 110. The switch control module 130 is electrically connected to the power supply module 002.

[0036] The first controllable switch 110 being in the first state based on the output of a valid signal from the power module 002 includes: the switch control module 130 controlling the first controllable switch 110 to be in the first state based on the output of a valid signal from the power module 002.

[0037] The first controllable switch 110 being in the second state based on the power module 002 outputting an invalid signal includes: the switch control module 130 controlling the first controllable switch 110 to be in the second state based on the power module 002 outputting an invalid signal.

[0038] In this embodiment, when the power module 002 outputs a valid signal, the switch control module 130 controls the first controllable switch 110 to be in a first state, thereby creating a circuit between the voltage divider module 120 and the first power supply 001. When the power module 002 outputs an invalid signal, the switch control module 130 controls the first controllable switch 110 to be in a second state, thereby creating an open circuit between the voltage divider module 120 and the first power supply 001. This facilitates the microprocessor of the vehicle control system to monitor the performance of the first power supply after the vehicle control system is powered on, and disconnects the connection between the voltage divider module 120 and the first power supply 001 after the vehicle control system is powered off. This helps to prevent leakage current from the voltage divider module 120 after the vehicle control system is powered off.

[0039] like Figure 2 or Figure 3 As shown, in one embodiment of this application, the switch control module 130 includes: a first voltage divider branch 131, a first transistor 132, and a voltage divider current limiting branch 133. The first voltage divider branch 131 is electrically connected to the output terminal of the power supply module 002. The first voltage divider branch 131 includes a first voltage divider resistor R1 and a second voltage divider resistor R2. The control terminal of the first transistor 132 is electrically connected to the node between the first voltage divider resistor R1 and the second voltage divider resistor R2. The first terminal of the first transistor 132 is electrically connected to the first power supply 001 through the voltage divider current limiting branch 133. The second terminal of the first transistor 132 is electrically connected to ground. The voltage divider current limiting branch 133 includes a third resistor R3 and a fourth resistor R4. The node between the third resistor R3 and the fourth resistor R4 is electrically connected to the control terminal of the first controllable switch 110.

[0040] In this embodiment, when the power module 002 outputs a valid signal, the first transistor 132 is turned on, which in turn makes the voltage divider and current limiting branch 133 in a closed state, thereby controlling the first controllable switch 110 to be in the first state, so that the voltage divider module 120 and the first power supply 001 are connected, so that the voltage divider module 120 can collect the voltage signal, and the microprocessor determines whether the power supply voltage of the first power supply 001 meets the power performance requirements based on the collected voltage signal.

[0041] In one possible implementation of this embodiment, the second terminal of the first transistor 132 is directly electrically connected to ground. Alternatively, the second terminal of the first transistor 132 is electrically connected to ground through a resistor.

[0042] In one possible implementation of this embodiment, the control terminal of the first transistor 132 is active high.

[0043] like Figure 2 As shown, in one possible implementation of this embodiment, the first controllable switch 110 includes a transistor, and / or the first transistor 132 is a transistor.

[0044] Transistors are characterized by ease of integration, low power consumption, and good stability. Using a transistor as the first controllable switch and / or the first transistor facilitates the integration and stability of the switch control module.

[0045] like Figure 3 As shown, in one possible implementation of this embodiment, the first controllable switch 110 includes a field-effect transistor, and / or the first transistor 132 is a field-effect transistor. For example, the first controllable switch includes a MOSFET, and / or the first transistor is a MOSFET.

[0046] Field-effect transistors (FETs) have advantages such as high integration and high-speed response. The first controllable switch 110 includes a FET, and / or the first transistor 132 is a FET, which is beneficial to improve the integration of the switch control module. At the same time, the use of a FET can isolate the voltage divider and current limiting branch 133 from the first voltage divider branch 131, avoiding electromagnetic interference from the voltage divider and current limiting branch 133 to the downstream circuit.

[0047] In one possible implementation of this embodiment, the first state of the first controllable switch 110 is the on state, and the second state of the first controllable switch 110 is the off state.

[0048] like Figure 4 As shown, in one embodiment of this application, the first controllable switch 110 is a relay switch.

[0049] In this embodiment, the contact switch of the relay switch is connected in series with the voltage divider module. The coil of the relay switch is electrically connected to the output terminal of the power supply module 002.

[0050] In one possible implementation of this embodiment, the control coil of the relay is connected in series with a current-limiting resistor. The function of the current-limiting resistor is to limit the current flowing through the control coil and protect the control coil. The series branch formed by the relay control coil and the current-limiting resistor is electrically connected at one end to the output terminal of the power module 002, and at the other end to the ground terminal.

[0051] In this implementation, the relay switch closes when the control coil is energized and opens when the control coil is de-energized. Therefore, when the power module 002 outputs a valid signal, the control coil of the relay switch is energized, and the switch closes, enabling voltage acquisition on the voltage divider module; when the power module 002 outputs an invalid signal, the control coil of the relay switch is de-energized, and the switch opens, thus avoiding leakage current.

[0052] like Figure 2 or Figure 3As shown, in one embodiment of this application, the voltage divider module 120 includes a fifth resistor R5 and a sixth resistor R6. The node between the fifth resistor R5 and the current resistor R6 is the output terminal of the power supply voltage acquisition circuit. This output terminal is used to electrically connect to the microprocessor in the vehicle control system so that the microprocessor can determine the performance of the first power supply 001 based on the acquired voltage signal.

[0053] like Figure 5 As shown, in one implementation of this embodiment, the first controllable switch 110 includes a field-effect transistor (FET) M1, and the switch control module 130 includes a first voltage divider resistor R1 and a second voltage divider resistor R2. The first voltage divider resistor R1 and the second voltage divider resistor R2 are connected in series, and the control terminal of the FET M1 is electrically connected to the node between the first voltage divider resistor R1 and the second voltage divider resistor R2. The first terminal of the FET M1 is electrically connected to the first power supply 001 through the voltage divider module 120, and the second terminal of the FET M1 is electrically connected to ground.

[0054] The connection between the second terminal of the field-effect transistor M1 and the ground can be either a direct connection between the second terminal of the field-effect transistor M1 and the ground, or a connection between the second terminal of the field-effect transistor M1 and the ground through a resistor.

[0055] like Figure 6 As shown, in one embodiment of this application, the first controllable switch 110 includes a field-effect transistor M1. The control terminal of the field-effect transistor M1 is electrically connected to the first output terminal of the power supply module 002, and the microprocessor 003 is electrically connected to the second output terminal of the power supply module 002. The first terminal of the field-effect transistor M1 is electrically connected to the first power supply 001 through a voltage divider module 120, and the second terminal of the field-effect transistor M1 is connected to ground.

[0056] The connection between the second terminal of the field-effect transistor M1 and the ground can be either a direct connection between the second terminal of the field-effect transistor M1 and the ground, or a connection between the second terminal of the field-effect transistor M1 and the ground through a resistor.

[0057] In one possible implementation, the output voltages of the first output terminal and the second output terminal of the power module 002 are not equal, in order to meet the requirement that the voltages of the control field-effect transistor M1 and the driving microprocessor are different.

[0058] In one possible implementation, the voltage required by the field-effect transistor M1 is equal to that required by the microprocessor 003. The output voltages of the first output terminal and the second output terminal of the power supply module 002 are equal. This reduces the circuit complexity of the power supply module 002 and helps to reduce costs.

[0059] In this embodiment, the first controllable switch 110 includes a field-effect transistor M1, and the control signal of the M1 is directly controlled by the output terminal of the power module 002, which can save power consumption.

[0060] This application also provides a power supply device, including the power supply voltage sampling circuit provided in any of the foregoing embodiments.

[0061] In this embodiment, the power supply device uses a power supply voltage sampling circuit, which can avoid leakage current when the vehicle control system is powered off, thereby reducing battery power consumption and improving battery range.

[0062] This application also provides a vehicle, which includes the power supply voltage sampling circuit 100 provided in any of the foregoing embodiments. Alternatively, the vehicle includes the power supply device provided in the foregoing embodiments.

[0063] The vehicle can be a gasoline-powered vehicle or a new energy vehicle, such as an electric vehicle. In the vehicle provided in this application embodiment, the vehicle can monitor the performance of the first battery in real time when powered on.

[0064] like Figure 7 As shown, in one embodiment of this application, the vehicle further includes: a first power supply 001, a wake-up circuit 004, a power module 002, and a microprocessor 003. The wake-up circuit 004 receives a wake-up signal, which is a power-on signal. The power-on signal includes: a key start signal, a key sensing signal, etc. The wake-up circuit 004 is electrically connected to the power module 002 and provides control signals to the power module 002. The voltage divider module 120 includes a fifth resistor R5 and a sixth resistor R6, and the node between the fifth resistor R5 and the sixth resistor R6 is electrically connected to the microprocessor 003.

[0065] The power supply voltage sampling circuit provided in this embodiment operates as follows: When the wake-up circuit 004 receives a wake-up signal, it outputs a valid signal to the power module 002. When the power module 002 receives the valid signal from the wake-up circuit 004, it starts working and outputs a valid signal. When the power module 002 outputs a valid signal, the first controllable switch 110 operates in the first state, and the voltage divider module 120 and the first power supply 001 are connected. The voltage divider module 120 outputs a voltage divider signal and transmits it to the microprocessor 003. When the microprocessor 003 receives the voltage divider signal, it determines the performance and state of the first power supply based on the voltage divider signal.

[0066] The same or similar parts between the various embodiments in this specification can be referred to mutually. In particular, the device embodiments and terminal embodiments are basically similar to the method embodiments, so the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

Claims

1. A power supply voltage sampling circuit, characterized in that, The power supply voltage sampling circuit is electrically connected to the power supply module of the vehicle control system, and the power supply module of the vehicle control system is electrically connected to the first power supply. The first power source provides power to the power module; The power supply voltage sampling circuit includes: First controllable switch; The voltage divider module is electrically connected to the first power supply via the first controllable switch; Wherein, based on the valid signal output by the power module, the first controllable switch is in a first state, and the first controllable switch being in the first state makes the voltage divider module and the first power supply a path. Based on the invalid signal output by the power module, the first controllable switch is in the second state, and the first controllable switch in the second state makes the voltage divider module and the first power supply disconnected.

2. The power supply voltage sampling circuit according to claim 1, characterized in that, Also includes: A switch control module is used to control the first controllable switch, and the switch control module is electrically connected to the power supply module; Wherein, the first controllable switch being in a first state based on the valid signal output by the power module includes: the switch control module controlling the first controllable switch to be in the first state based on the valid signal output by the power module; The first controllable switch being in the second state based on the power module outputting an invalid signal includes: the switch control module controlling the first controllable switch to be in the second state based on the power module outputting an invalid signal.

3. The power supply voltage sampling circuit according to claim 2, characterized in that, The switch control module includes: The first voltage divider branch is electrically connected to the power module, and the first voltage divider branch includes a first voltage divider resistor and a second voltage divider resistor. The first transistor has its control terminal electrically connected to the node between the first voltage divider resistor and the second voltage divider resistor; the first terminal of the first transistor is electrically connected to the first power supply through a voltage divider current limiting branch; and the second terminal of the first transistor is electrically connected to ground. The voltage divider and current limiting branch includes a third resistor and a fourth resistor; the node between the third resistor and the fourth resistor is electrically connected to the control terminal of the first controllable switch.

4. The power supply voltage sampling circuit according to claim 1, characterized in that, The first controllable switch includes a transistor, and / or the first transistor is a transistor.

5. The power supply voltage sampling circuit according to claim 1, characterized in that, The first controllable switch includes a field-effect transistor, and / or the first transistor is a field-effect transistor.

6. The power supply voltage sampling circuit according to claim 1, characterized in that, The first controllable switch is a relay switch.

7. The power supply voltage sampling circuit according to claim 6, characterized in that, The control coil of the relay switch is connected in series with the current-limiting resistor. One end of the series branch formed by the control coil of the relay switch and the current-limiting resistor is electrically connected to the power module, and the other end of the series branch is electrically connected to the ground.

8. The power supply voltage sampling circuit according to claim 1, characterized in that, The first controllable switch includes a field-effect transistor (FET), the control terminal of which is electrically connected to the power module, the first terminal of which is electrically connected to the first power supply, and the second terminal of which is electrically connected to the voltage divider module.

9. A power supply device, characterized in that, Includes the power supply voltage sampling circuit as described in any one of claims 1-8.

10. A vehicle, characterized in that, The vehicle includes a power supply voltage sampling circuit as described in any one of claims 1-8; or the vehicle includes a power supply device as described in claim 9.

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