Low-power-consumption circuit based on buck converter power supply, vehicle and method

Abstract

The invention relates to the technical field of vehicle electronic parts, in particular to a low-power-consumption circuit based on buck converter power supply, a vehicle and a method, the circuit comprises a buck converter circuit, a detection circuit and a load unit, the buck converter circuit is used for converting an input voltage into a working voltage required by the load unit; the detection circuit is used for detecting the level state of a first pin of an IC chip in the step-down converter circuit and generating a mode control signal according to the level state of the first pin; the load unit is powered by the buck converter circuit and is used for switching between a first working mode and a second working mode according to the mode control signal of the detection circuit. Therefore, the problems of communication failure risk, high cost and influence on output voltage and current values in the prior art are solved, and accurate judgment on the SOC low-power-consumption mode is realized by detecting the state of the SW pin of the step-down converter.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle electronic components, and in particular to a low-power circuit, vehicle and method powered by a buck converter. Background Art

[0002] In the field of automotive electronic components, step-down converter circuits are widely used to provide stable power to loads. With the increasing number of automotive functions and the increasing demand for convenience of in-vehicle devices, it is important to ensure that the in-vehicle system enters low-power mode after the vehicle is turned off to avoid the inability to restart due to the in-vehicle battery feeding.

[0003] In the related art, the low power state of the system on chip (SOC) is mainly detected by the following two methods: one is to use the universal asynchronous receiver / transmitter (UART) communication between the SOC and the microcontroller unit (MCU). During this process, the SOC will inform the MCU through UART communication when it enters the low power mode; the other method is to detect the current at the input end of the SOC through a precision resistor, and convert the current signal into a voltage signal, which is amplified by an amplifier and output to the analog-to-digital conversion (AD) detection pin of the MCU to determine whether the SOC has entered the low power mode.

[0004] However, the success rate of the UART communication method in the related technology is not absolutely reliable, especially in complex electromagnetic environments, where communication failures are prone to occur. In addition, the method of using precision resistors combined with amplifiers for current collection not only increases the hardware cost, but also affects the output voltage and current values, which needs to be solved urgently. Summary of the invention

[0005] The present application provides a low-power circuit, vehicle and method powered by a buck converter to solve the problems of communication failure risk and high cost, and the impact on output voltage and current values ​​in the background technology. By detecting the SW pin status of the buck converter, accurate judgment of the SOC low-power mode is achieved.

[0006] The first aspect of the present application provides a low-power circuit powered by a buck converter, including: a buck converter circuit, a detection circuit and a load unit, wherein:

[0007] The buck converter circuit is used to convert the input voltage into the working voltage required by the load unit;

[0008] The detection circuit is used to detect the level state of the first pin of the IC chip in the buck converter circuit, and generate a mode control signal according to the level state of the first pin;

[0009] The load unit is powered by the buck converter circuit, and is used to switch between a first operating mode and a second operating mode according to a mode control signal of the detection circuit, wherein power consumption of the first operating mode is lower than power consumption of the second operating mode.

[0010] According to one embodiment of the present application, the buck converter circuit includes:

[0011] IC chips;

[0012] A first capacitor, one end of which is connected to the second pin of the IC chip;

[0013] an inductor, one end of which is connected to the first pin of the IC chip, and the other end of which is connected to the input end of the load unit;

[0014] a second capacitor, one end of the second capacitor being connected to a connection node between the inductor and the input end of the load unit, and the other end of the second capacitor being connected to a ground node;

[0015] a first diode, wherein a cathode of the first diode is connected to a connection node between a first pin of the IC chip and the inductor, and an anode of the first diode is connected to the ground node;

[0016] a third capacitor, one end of which is connected to a third pin of the IC chip;

[0017] a first resistor, one end of the first resistor being connected to the fourth pin of the IC chip, and the other end of the first resistor being connected to a connection node between the other end of the third capacitor and the ground node;

[0018] a second resistor, one end of which is connected to a connection node between the inductor and the second capacitor;

[0019] a third resistor, one end of the third resistor is connected to the other end of the second resistor, and the other end of the third resistor is connected to the ground node.

[0020] According to one embodiment of the present application, the detection circuit includes:

[0021] A control unit, wherein a first pin of the control unit is connected to a fifth pin of the IC chip;

[0022] a fourth capacitor, one end of the fourth capacitor being connected to a connection node between the other end of the first capacitor and the cathode of the first diode;

[0023] a fourth resistor, one end of the fourth resistor being connected to the other end of the fourth capacitor;

[0024] a fifth resistor, the other end of which is connected to the ground node;

[0025] a second diode, wherein an anode of the second diode is connected to a connection node between the other end of the fourth resistor and one end of the fifth resistor;

[0026] a fifth capacitor, one end of which is connected to the cathode of the second diode;

[0027] A sixth resistor, one end of the sixth resistor is respectively connected to the connection node between the second pin of the control unit, the cathode of the second diode and one end of the fifth capacitor, and the other end of the sixth resistor is connected to the connection node between the fifth capacitor and the ground node.

[0028] According to an embodiment of the present application, the load unit is a system on chip.

[0029] According to an embodiment of the present application, the voltage value of the input terminal of the load unit is determined by the second resistor and the third resistor.

[0030] According to one embodiment of the present application, the IC chip further includes:

[0031] A sixth pin, the sixth pin being connected to the input voltage;

[0032] A seventh pin, the seventh pin being connected to the ground node;

[0033] An eighth pin, wherein the eighth pin is connected to a connection node between the second resistor and the third resistor.

[0034] According to one embodiment of the present application, the detection circuit is specifically used for:

[0035] When the voltage at the second pin of the control unit is less than a preset threshold, the first pin of the control unit is used to control the fifth pin of the IC chip to cut off the power supply to the load unit.

[0036] According to the low-power circuit powered by a buck converter provided in the embodiment of the present application, a detection circuit is used to obtain the level state of the first pin of the IC chip in the buck converter circuit; the level state of the first pin of the IC chip is converted into a voltage value at the second pin of the control unit; when the voltage value at the second pin of the control unit is less than a preset threshold, a mode control signal is sent to the IC chip, and the load unit is controlled to switch to the first working mode according to the mode control signal. Thus, the risk of communication failure and high cost, and the problem of affecting the output voltage and current value in the background technology are solved, and by detecting the SW pin state of the buck converter, the accurate judgment of the SOC low-power mode is achieved.

[0037] A second aspect of the present application provides a vehicle, which includes a low-power consumption circuit powered by a buck converter according to the above embodiment.

[0038] According to the vehicle of the embodiment of the present application, the risk of communication failure and high cost, and the problems affecting the output voltage and current value in the background technology are solved through the above-mentioned low-power circuit powered by the buck converter. By detecting the SW pin status of the buck converter, accurate judgment of the SOC low-power mode is achieved.

[0039] A third aspect of the present application provides a control method for a low-power circuit powered by a buck converter, which is applied to the above-mentioned low-power circuit powered by a buck converter, wherein the method comprises the following steps:

[0040] Using a detection circuit to obtain a level state of a first pin of an IC chip in a buck converter circuit;

[0041] Converting the level state of the first pin of the IC chip into a voltage value at the second pin of the control unit;

[0042] Determining whether the voltage value at the second pin of the control unit is less than a preset threshold;

[0043] If the voltage value at the second pin of the control unit is less than the preset threshold, a mode control signal is sent to the IC chip, and the load unit is controlled to switch to the first working mode according to the mode control signal.

[0044] According to an embodiment of the present application, after determining whether the voltage value at the second pin of the control unit is less than a preset threshold, the method further includes:

[0045] If the voltage value at the second pin of the control unit is greater than or equal to the preset threshold, the load unit is controlled to maintain the second working mode according to the mode control signal.

[0046] According to the control method of the low-power circuit powered by the buck converter provided in the embodiment of the present application, the detection circuit is used to obtain the level state of the first pin of the IC chip in the buck converter circuit; the level state of the first pin of the IC chip is converted into the voltage value at the second pin of the control unit; when the voltage value at the second pin of the control unit is less than the preset threshold, a mode control signal is sent to the IC chip, and the load unit is controlled to switch to the first working mode according to the mode control signal. Thus, the risk of communication failure and high cost, and the problem of affecting the output voltage and current value in the background technology are solved, and the accurate judgment of the SOC low-power mode is achieved by detecting the SW pin state of the buck converter.

[0047] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0049] Figure 1 A schematic diagram of the structure of a low-power circuit powered by a buck converter according to an embodiment of the present application;

[0050] Figure 2 A schematic diagram of a Step-Down Converter according to an embodiment of the present application operating in a continuous conduction mode, with the pin SW in a PWM mode;

[0051] Figure 3 A schematic diagram of a Step-Down Converter according to an embodiment of the present application operating in a discontinuous conduction mode, with the pin SW in an oscillation mode;

[0052] Figure 4 A flowchart of a control method for a low-power circuit powered by a buck converter according to an embodiment of the present application; DETAILED DESCRIPTION

[0053] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0054] The following describes the low-power circuit, vehicle and method based on the power supply of the buck converter of the embodiment of the present application with reference to the accompanying drawings. In view of the risk of communication failure and high cost mentioned in the above background technology, and the problems of affecting the output voltage and current value, the present application provides a low-power circuit based on the power supply of the buck converter, and uses the detection circuit to obtain the level state of the first pin of the IC chip in the buck converter circuit; the level state of the first pin of the IC chip is converted into the voltage value at the second pin of the control unit; when the voltage value at the second pin of the control unit is less than the preset threshold, a mode control signal is sent to the IC chip, and the load unit is controlled to switch to the first working mode according to the mode control signal. Thus, the risk of communication failure and high cost, which affect the output voltage and current value in the background technology are solved, and the state of the Step-Down Converter SW pin is detected by a circuit composed of a resistor, a capacitor and an inductor, so as to determine the low power consumption mode, and the application cost is low and the reliability is high.

[0055] Specifically, Figure 1 A schematic diagram of the structure of a low-power circuit powered by a buck converter provided in an embodiment of the present application.

[0056] like Figure 1 As shown, the low power consumption circuit 10 powered by a buck converter includes: a buck converter circuit 100 , a detection circuit 200 and a load unit 300 .

[0057] Among them, Figure 1 As shown, the buck converter circuit 100 is used to convert the input voltage into the operating voltage required by the load unit 300; the detection circuit 200 is used to detect the level state of the first pin SW of the IC chip in the buck converter circuit 100, and generate a mode control signal according to the level state of the first pin SW; the load unit 300 is powered by the buck converter circuit 100, and the load unit 300 is used to switch between the first operating mode and the second operating mode according to the mode control signal of the detection circuit 200, wherein the power consumption of the first operating mode is lower than the power consumption of the second operating mode.

[0058] The first pin SW of the IC chip may be a switch control pin. The first pin SW of the IC chip controls the charging and discharging of the inductor through a PWM (pulse width modulation) signal, thereby achieving voltage step-down conversion.

[0059] Specifically, if Figure 1As shown, the step-down converter circuit is used to convert the higher input voltage provided by the vehicle power system into a lower output voltage suitable for use by the load unit 300. The detection circuit 200 is used to monitor the level state of the SW pin in the step-down converter IC chip, and generate a corresponding mode control signal based on the level state of the SW pin. The load unit 300 is mainly composed of the SOC, and the load unit 300 relies on the stable output voltage VOUT provided by the step-down converter circuit 100 to work. According to the mode control signal transmitted by the detection circuit 200, the load unit 300 can switch between the high power consumption mode (the second working mode) and the low power consumption mode (the first working mode). In the high power consumption mode, the SOC performs all functions and consumes more power; while in the low power consumption mode, some functions of the SOC are turned off or limited, thereby greatly reducing energy consumption and preventing the occurrence of power feeding problems due to excessive static current of the vehicle battery for a long time.

[0060] Optionally, in some embodiments, Figure 1 As shown, the buck converter circuit 100100 includes: an IC chip; a first capacitor C1, one end of the first capacitor C1 is connected to the second pin BST of the IC chip; an inductor, one end of the inductor is connected to the first pin SW of the IC chip, and the other end of the inductor is connected to the input end of the load unit 300; a second capacitor C2, one end of the second capacitor C2 is connected to the connection node between the inductor and the input end of the load unit 300, and the other end of the second capacitor C2 is connected to the ground node; a first diode D1, the cathode of the first diode D1 is connected to the connection node between the first pin SW of the IC chip and the inductor , an anode of the first diode D1 is connected to the ground node; a third capacitor C3, one end of the third capacitor C3 is connected to the third pin COMP of the IC chip; a first resistor R1, one end of the first resistor R1 is connected to the fourth pin RT of the IC chip, and the other end of the first resistor R1 is connected to a connection node between the other end of the third capacitor C3 and the ground node; a second resistor R2, one end of the second resistor R2 is connected to a connection node between the inductor and the second capacitor C2; a third resistor R3, one end of the third resistor R3 is connected to the other end of the second resistor R2, and the other end of the third resistor R3 is connected to the ground node.

[0061] Optionally, in some embodiments, Figure 1 As shown, the IC chip also includes: a sixth pin VIN, the sixth pin VIN is connected to the input voltage; a seventh pin GND, the seventh pin GND is connected to the ground node; and an eighth pin FB, the eighth pin FB is connected to the connection node between the second resistor R2 and the third resistor R3.

[0062] Among them, the second pin BST of the IC chip is a self-boosting pin, the third pin COMP of the IC chip is a comparator input pin, the fourth pin RT of the IC chip is a frequency setting pin, the fifth pin EN of the IC chip is an enable pin, the sixth pin VIN of the IC chip is an input voltage pin, the seventh pin GND of the IC chip is a ground pin, and the eighth pin FB of the IC chip is an output voltage feedback pin.

[0063] Optionally, the first capacitor C1 is a bootstrap capacitor, and the first capacitor C1 of the embodiment of the present application can be selected at the nF level; the inductor is an energy storage inductor, the second capacitor C2 is an energy storage capacitor, the third capacitor C3 is a compensation capacitor, and the third capacitor C3 of the embodiment of the present application can be selected at the pF level, the first diode D1 is a freewheeling diode, the first resistor R1 is a frequency setting resistor, and the value of the first resistor R1 sets the frequency of the first pin SW of the IC chip to FSW; the second resistor R2 and the third resistor R3 are both output voltage setting resistors. The values ​​of the first diode D1, the inductor, and the second capacitor C2 are determined by multiple factors such as the load current, the operating frequency of the first pin SW of the IC chip, and the input and output voltages, and are not specifically limited here.

[0064] Specifically, if Figure 1 As shown, one end of the first capacitor C1 is connected to the first pin SW of the IC chip, and the other end of the first capacitor C1 is connected to the second pin BST of the IC chip; the input voltage is connected to the sixth pin VIN of the IC chip; the first pin GPIO_EN of the control unit MCU is connected to the fifth pin EN of the IC chip; one end of the first resistor R1 is connected to the fourth pin RT of the IC chip, and the other end of the first resistor R1 is grounded; one end of the third resistor R3 is connected to the eighth pin FB of the IC chip, and the other end of the third resistor R3 is grounded; one end of the second resistor R2 is connected to the third resistor R3, and the other end of the second resistor R2 is connected to the output voltage collection point, one end of the third capacitor C3 is connected to the third pin COMP of the IC chip, and the other end of the third capacitor C3 is grounded; the seventh pin GND of the IC chip is grounded; one end of the first diode D1 is connected to the first pin SW of the IC chip, and the other end of the first diode D1 is grounded; one end of the inductor is connected to the first pin SW of the IC chip, and the other end of the inductor is connected to the output voltage; one end of the second capacitor C2 is connected to the output voltage, and the other end of the second capacitor C2 is grounded.

[0065] Optionally, in some embodiments, Figure 1As shown, the detection circuit 200200 includes: a control unit MCU, a first pin GPIO_EN of the control unit MCU is connected to the fifth pin EN of the IC chip; a fourth capacitor C4, one end of the fourth capacitor C4 is connected to the connection node between the other end of the first capacitor C1 and the cathode of the first diode D1; a fourth resistor R4, one end of the fourth resistor R4 is connected to the other end of the fourth capacitor C4; a fifth resistor R5, the other end of the fifth resistor R5 is connected to the ground node; a second diode D2, an anode of the second diode D2 is connected to the connection node between the other end of the fourth resistor R4 and one end of the fifth resistor R5; a fifth capacitor C5, one end of the fifth capacitor C5 is connected to the cathode of the second diode D2; a sixth resistor R6, one end of the sixth resistor R6 is respectively connected to the connection node between the second pin BST of the control unit MCU, the cathode of the second diode D2 and one end of the fifth capacitor C5, and the other end of the sixth resistor R6 is connected to the connection node between the fifth capacitor C5 and the ground node.

[0066] Optionally, the control unit MCU can be a microcontroller unit, the fourth capacitor C4 is a coupling capacitor, the fifth capacitor C5 is a filter capacitor, the fourth resistor R4 and the fifth resistor R5 are voltage divider resistors, the sixth resistor R6 is a ground resistor, and the second diode D2 is a rectifier diode.

[0067] Specifically, one end of the fourth capacitor C4 is connected to the first pin SW of the IC chip, and the other end of the fourth capacitor C4 is connected to the fourth resistor R4; one end of the fifth resistor R5 is connected to the fourth resistor R4, and the other end of the fifth resistor R5 is grounded; one end of the second diode D2 is connected to the fourth resistor R4, and the other end of the second diode D2 is respectively connected to the fifth capacitor C5 and the sixth resistor R6; the other end of the fifth capacitor C5 is grounded; one end of the sixth resistor R6 is grounded, and the other end of the sixth resistor R6 is connected to the second pin GPIO_AD of the control unit MCU.

[0068] Optionally, in some embodiments, Figure 1 As shown, the load unit 300 is a system on chip SOC.

[0069] In some embodiments, the voltage value of the input terminal of the load unit 300 is determined by the second resistor R2 and the third resistor R3.

[0070] Specifically, the load unit 300 is composed of a SOC, and the output voltage of the buck converter is connected to the input terminal of the load unit 300. Figure 2As shown, when the SOC is in the normal operating mode, that is, the heavy load mode, the buck converter circuit 100 operates in the continuous conduction mode, the first pin SW of the IC chip is in the PWM mode, the operating frequency is determined by the first resistor R1, the on-time TON of the first pin SW of the IC chip is constant, the PWM duty cycle is determined by the ratio of the input voltage to the output voltage, the voltage amplitude is determined by the input voltage, and the detection circuit 200 collects the PWM voltage of the first pin SW of the IC chip and converts the PWM voltage into the GPIO_AD value.

[0071] Furthermore, if Figure 3 As shown, when the SOC is in light load mode, that is, low power consumption mode, the buck converter circuit 100 operates in intermittent conduction mode, the first pin SW of the IC chip is in oscillation mode, the on-time TON of the first pin SW of the IC chip is constant, there is a damped oscillation period after TON is turned on, the duty cycle is inconsistent with that in the heavy load mode, the duty cycle of the intermittent conduction mode is lower than that of the continuous conduction mode, the GPIO_AD value converted by the detection circuit 200 is inconsistent, the control unit MCU determines the working state of the SOC through the GPIO_AD value, and when the SOC enters the low power consumption mode, the control unit MCU controls the fifth pin EN of the IC chip through the first pin GPIO_EN to power off the SOC.

[0072] Optionally, in some embodiments, the detection circuit 200 is specifically used to: when the voltage at the second pin GPIO_AD of the control unit MCU is less than a preset threshold, use the first pin GPIO_EN of the control unit MCU to control the fifth pin EN of the IC chip to cut off the power supply to the load unit 300.

[0073] Specifically, the low-power circuit powered by a buck converter in the embodiment of the present application is intended to detect when the SOC enters a low-power mode, power off the SOC through the MCU, and put the vehicle electronic component system into a sleep mode. The state of the first pin SW in the buck converter circuit 100 is detected by a circuit composed of low-cost discrete electronic components; different states of the first pin SW correspond to different operating modes of the SOC.

[0074] For example, in one embodiment of the present application, the operating voltage range of the input voltage KL30 is usually 9-16V, and the input terminal VOUT of the SOC requires a stable voltage value. For the convenience of analysis, the embodiment of the present application can take the KL30 voltage as 12V, and the VOUT voltage value as 5±0.1V. When the SOC is in the first working mode (light load mode) and the second working mode (heavy load mode), the state of the first pin SW of the IC chip is inconsistent. The detection circuit 200 collects the voltage of the first pin SW of the IC chip and converts it into GPIO_AD. The control unit MCUMCU performs corresponding operations through the different GPIO_AD voltages of the two modes.

[0075] It should be noted that the fourth capacitor C4 plays a role in isolating direct-current AC; in order to avoid the risk of failure of the control unit MCU, the values ​​of the third resistor R3 and the fourth resistor R4 are such that the value of the second pin GPIO_AD of the control unit MCU cannot be greater than the power supply voltage of the control unit MCU; the second diode D2 is used to isolate the negative pressure generated by the forward conduction of the first diode D1, which may damage the second pin GPIO_AD of the control unit MCU; the fifth capacitor C5 is used to filter out the high-frequency part of the AC voltage, and the sixth resistor R6 is used to make the GPIO_AD value in a steady state.

[0076] When the SOC is in heavy load mode, the voltage amplitude of the first pin SW of the IC chip is 12V, the duty cycle is 5 / 12, and when the fourth resistor R4 and the fifth resistor R5 have the same value, the value of the second pin GPIO_AD of the control unit MCU is about 2.5V;

[0077] When the SOC is in light load mode, the voltage amplitude of the first pin SW of the IC chip is 12V, the duty cycle is much lower than 5 / 12, the voltage of the second pin GPIO_AD of the control unit MCU is much lower than 2.5V, and the first pin GPIO_EN of the control unit MCU pulls down the fifth pin EN of the IC chip to power off the SOC, thereby controlling the electronic component system to enter sleep mode.

[0078] According to the low-power circuit based on buck converter power supply proposed in the embodiment of the present application, the detection circuit is used to obtain the level state of the first pin of the IC chip in the buck converter circuit; the level state of the first pin of the IC chip is converted into the voltage value at the second pin of the control unit; when the voltage value at the second pin of the control unit is less than the preset threshold, a mode control signal is sent to the IC chip, and the load unit is controlled to switch to the first working mode according to the mode control signal. In this way, the risk of communication failure and high cost, which affect the output voltage and current value, existing in the background technology are solved, and the accurate judgment of the SOC low-power mode is achieved by detecting the SW pin state of the buck converter.

[0079] An embodiment of the present application also provides a vehicle, which includes the low-power consumption circuit powered by a buck converter according to the above embodiment.

[0080] According to the vehicle of the embodiment of the present application, the risk of communication failure and high cost, and the problems affecting the output voltage and current value in the background technology are solved through the above-mentioned low-power circuit powered by the buck converter. By detecting the SW pin status of the buck converter, accurate judgment of the SOC low-power mode is achieved.

[0081] The following describes a control method for a low-power circuit powered by a buck converter according to an embodiment of the present application with reference to the accompanying drawings. The method is applied to the above-mentioned low-power circuit powered by a buck converter.

[0082] like Figure 4 As shown, the control method of the low power consumption circuit powered by a buck converter comprises the following steps:

[0083] In step S401, a detection circuit is used to obtain a level state of a first pin of an IC chip in a buck converter circuit.

[0084] In step S402, the level state of the first pin of the IC chip is converted into a voltage value at the second pin of the control unit.

[0085] In step S403, it is determined whether the voltage value at the second pin of the control unit is less than a preset threshold.

[0086] In step S404, if the voltage value at the second pin of the control unit is less than the preset threshold, a mode control signal is sent to the IC chip, and the load unit is controlled to switch to the first working mode according to the mode control signal.

[0087] Furthermore, in some embodiments, after determining whether the voltage value at the second pin of the control unit is less than a preset threshold, it also includes: if the voltage value at the second pin of the control unit is greater than or equal to the preset threshold, then according to the mode control signal, controlling the load unit to maintain the second working mode.

[0088] It should be noted that the aforementioned explanation of the embodiment of the low-power circuit powered by a buck converter is also applicable to the control method of the low-power circuit powered by a buck converter in this embodiment, and will not be repeated here.

[0089] According to the control method of the low-power circuit based on buck converter power supply proposed in the embodiment of the present application, the detection circuit is used to obtain the level state of the first pin of the IC chip in the buck converter circuit; the level state of the first pin of the IC chip is converted into the voltage value at the second pin of the control unit; when the voltage value at the second pin of the control unit is less than the preset threshold, a mode control signal is sent to the IC chip, and the load unit is controlled to switch to the first working mode according to the mode control signal. Thus, the risk of communication failure and high cost, and the problem of affecting the output voltage and current value existing in the background technology are solved, and the accurate judgment of the SOC low-power mode is achieved by detecting the SW pin state of the buck converter.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0091] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0092] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0093] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0094] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0095] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0096] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0097] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A low power consumption circuit based on a buck converter, characterized in that: include: Buck converter circuit, detection circuit and load unit, wherein, The buck converter circuit is used to convert the input voltage into the working voltage required by the load unit; The detection circuit is used to detect the level state of the first pin of the IC chip in the buck converter circuit, and generate a mode control signal according to the level state of the first pin; The load unit is powered by the buck converter circuit, and is used to switch between a first operating mode and a second operating mode according to a mode control signal of the detection circuit, wherein power consumption of the first operating mode is lower than power consumption of the second operating mode.

2. The low power consumption circuit based on buck converter power supply according to claim 1, characterized in that: The buck converter circuit comprises: IC chips; A first capacitor, one end of which is connected to the second pin of the IC chip; an inductor, one end of which is connected to the first pin of the IC chip, and the other end of which is connected to the input end of the load unit; a second capacitor, one end of the second capacitor being connected to a connection node between the inductor and the input end of the load unit, and the other end of the second capacitor being connected to a ground node; a first diode, wherein a cathode of the first diode is connected to a connection node between a first pin of the IC chip and the inductor, and an anode of the first diode is connected to the ground node; a third capacitor, one end of which is connected to a third pin of the IC chip; a first resistor, one end of the first resistor being connected to the fourth pin of the IC chip, and the other end of the first resistor being connected to a connection node between the other end of the third capacitor and the ground node; a second resistor, one end of which is connected to a connection node between the inductor and the second capacitor; a third resistor, one end of the third resistor is connected to the other end of the second resistor, and the other end of the third resistor is connected to the ground node.

3. The low power consumption circuit based on buck converter power supply according to claim 2, characterized in that: The detection circuit comprises: A control unit, wherein a first pin of the control unit is connected to a fifth pin of the IC chip; a fourth capacitor, one end of the fourth capacitor being connected to a connection node between the other end of the first capacitor and the cathode of the first diode; a fourth resistor, one end of the fourth resistor being connected to the other end of the fourth capacitor; a fifth resistor, the other end of which is connected to the ground node; a second diode, wherein an anode of the second diode is connected to a connection node between the other end of the fourth resistor and one end of the fifth resistor; a fifth capacitor, one end of which is connected to the cathode of the second diode; A sixth resistor, one end of the sixth resistor is respectively connected to the connection node between the second pin of the control unit, the cathode of the second diode and one end of the fifth capacitor, and the other end of the sixth resistor is connected to the connection node between the fifth capacitor and the ground node.

4. The low power consumption circuit based on buck converter power supply according to claim 3, characterized in that: The load unit is a system on a chip.

5. The low power consumption circuit based on buck converter power supply according to claim 4, characterized in that: The voltage value of the input terminal of the load unit is determined by the second resistor and the third resistor.

6. The low power consumption circuit based on buck converter power supply according to claim 2, characterized in that: The IC chip further includes: A sixth pin, the sixth pin being connected to the input voltage; A seventh pin, the seventh pin being connected to the ground node; An eighth pin, wherein the eighth pin is connected to a connection node between the second resistor and the third resistor.

7. The low power consumption circuit based on buck converter power supply according to claim 3, characterized in that: The detection circuit is specifically used for: When the voltage at the second pin of the control unit is less than a preset threshold, the first pin of the control unit is used to control the fifth pin of the IC chip to cut off the power supply to the load unit.

8. A vehicle, characterized in that: The invention comprises a low power consumption circuit powered by a buck converter as claimed in any one of claims 1 to 7.

9. A control method for a low power consumption circuit powered by a buck converter, characterized in that: The method is applied to a low-power circuit powered by a buck converter according to any one of claims 1 to 7, wherein the method comprises the following steps: Using a detection circuit to obtain a level state of a first pin of an IC chip in a buck converter circuit; Converting the level state of the first pin of the IC chip into a voltage value at the second pin of the control unit; Determining whether the voltage value at the second pin of the control unit is less than a preset threshold; If the voltage value at the second pin of the control unit is less than the preset threshold, a mode control signal is sent to the IC chip, and the load unit is controlled to switch to the first working mode according to the mode control signal.

10. The method according to claim 9, characterized in that After determining whether the voltage value at the second pin of the control unit is less than a preset threshold, the method further includes: If the voltage value at the second pin of the control unit is greater than or equal to the preset threshold, the load unit is controlled to maintain the second working mode according to the mode control signal.

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