A BOOST protection and load detection circuit

Abstract

The present invention relates to the technical field of power supply, and in particular to a BOOST protection and load detection circuit, which comprises an MCU, a BOOST circuit and a BOOST input protection and load detection circuit connected to the MCU and connected to each other, and solves the problem that the existing BOOST control enabling and protection circuit occupies more IO ports of the MCU and cannot detect the load while protecting the BOOST. The present invention realizes the protection and load detection of the BOOST circuit through the MCU and the BOOST input protection and load detection circuit, and the whole circuit is simple and has high reliability. At the same time, the present invention realizes the short circuit detection and control enabling of the BOOST circuit through a single IO, does not need to occupy additional IO resources, and reduces the cost.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a BOOST protection and load detection circuit. Background Art

[0002] The BOOST boost circuit is a switching DC boost circuit that can make the output voltage higher than the input voltage. It is mainly used in DC motor drives, single-phase power factor correction (PFC) circuits and other AC and DC power supplies.

[0003] However, when the existing asynchronous BOOST is not enabled, the output voltage and the input voltage form a path through the inductor and the diode, and the true output voltage cannot be truly shut down. Therefore, a protection circuit is usually added. However, in the existing BOOST application scenarios, the control enable and protection circuits occupy more resources, generally requiring at least three IO resources, one for enabling, one for detecting short circuits, and one for controlling and shutting down the BOOST input. In addition, the existing BOOST protection circuit cannot realize load detection.

[0004] Similar patent descriptions are as follows:

[0005] a) A protection circuit for output short circuit of a boost constant current power supply, patent number: CN103560490A;

[0006] This solution uses a resettable fuse to provide short-circuit protection for the BOOST output voltage. Disadvantage: Using a resettable fuse will increase costs.

[0007] b) A protection method and circuit for a BOOST circuit, patent number: CN105449642B;

[0008] This solution connects a switch in series on the power path. The disadvantages are: there will be a certain delay when the switch is turned off, and active recovery cannot be achieved after shutdown; and this solution only implements output short-circuit protection, and cannot achieve short-circuit protection to ground.

[0009] c) A voltage boost protection circuit, patent number: CN104167911A;

[0010] This solution is implemented by connecting a sampling resistor in series on the BOOST output path. The disadvantages are: the size of the sampling resistor is limited, resulting in a large current after a short circuit, which has a certain impact on the output efficiency; and its protection circuit is relatively complex.

[0011] Therefore, there is currently a lack of a circuit that can simultaneously protect BOOST and detect loads while occupying fewer IO ports of the MCU. Summary of the invention

[0012] The present invention provides a BOOST protection and load detection circuit, which solves the technical problem that the existing BOOST control enabling and protection circuit occupies more IO ports of MCU and cannot detect the load while protecting BOOST.

[0013] In order to solve the above technical problems, the present invention provides a BOOST protection and load detection circuit, comprising an MCU, and a BOOST circuit and a BOOST input protection and load detection circuit connected to the MCU and connected to each other;

[0014] The BOOST input protection and load detection circuit is used to detect the load connected to the BOOST circuit and wake up the MCU when it is detected that the load reaches a certain voltage value;

[0015] The MCU is used to detect the enable signal output by the BOOST circuit in real time after being awakened;

[0016] The MCU is also used to control the BOOST circuit to enable when it detects that the enable signal output by the BOOST circuit is lower than the BOOST protection threshold, and output a BOOST control signal to control the input of the BOOST circuit by the BOOST input protection and load detection circuit.

[0017] The technical solution realizes the load detection of the BOOST circuit through the BOOST input protection and load detection circuit; at the same time, the MCU in the solution provides fast and effective protection for the BOOST circuit under abnormal conditions such as overvoltage and short circuit through real-time detection of the BOOST circuit, and the whole circuit is simple and easy to implement, which reduces the cost.

[0018] In a further embodiment, the BOOST input protection and load detection circuit comprises:

[0019] A power input unit connected between a power source and a power input terminal of the BOOST circuit;

[0020] A BOOST control unit connected between a power supply, a power input terminal of the BOOST circuit and a BOOST control IO terminal of the MCU;

[0021] A wake-up unit connected between a power supply, a power input terminal of the BOOST circuit and ground;

[0022] The BOOST circuit includes:

[0023] An inductor unit connected between a power input terminal and a signal output terminal of the BOOST circuit;

[0024] A BOOST enable adjustment unit is connected between the signal output terminal, the enable terminal and the ground of the BOOST circuit.

[0025] The BOOST input protection and load detection circuit of the technical solution realizes load detection of the BOOST circuit; at the same time, the current input to the BOOST circuit is controlled by the power input unit and the BOOST control unit, and the MCU is awakened by the wake-up unit, thereby realizing input protection of the BOOST circuit, providing guarantee for the normal operation of the BOOST circuit, and the circuit reliability is high; the normal opening of the BOOST circuit is realized by adjusting the inductor unit and the BOOST enable adjustment unit.

[0026] Specifically, the power input unit includes a first resistor connected between the power supply and a power input terminal of the BOOST circuit.

[0027] In this solution, the resistance value of the first resistor can be adjusted so that the current flowing into the power input terminal of the BOOST circuit is limited to a certain range, thereby realizing input protection of the BOOST circuit.

[0028] Specifically, the BOOST control unit includes a first MOS tube and a second resistor, the source of the first MOS tube is connected to the power supply, the drain of the first MOS tube is connected to the power input end of the BOOST circuit, and the gate of the first MOS tube is connected to the BOOST control IO end of the MCU; the second resistor is connected between the gate and the source of the first MOS tube.

[0029] In this solution, the BOOST control signal outputted from the BOOST control IO terminal of the MCU adjusts the first MOS tube, thereby changing the current flowing into the power input terminal of the BOOST circuit, so that the BOOST circuit can normally provide power to the load.

[0030] Specifically, the BOOST enable adjustment unit includes a third resistor and a fourth resistor sequentially connected in series between the signal output end of the BOOST circuit and the ground, and the enable end of the BOOST circuit is connected to the common connection end of the third resistor and the fourth resistor; the enable end of the BOOST circuit is also connected to the enable control IO end of the MCU.

[0031] In this solution, the resistance values ​​of the third resistor and the fourth resistor can be adjusted so that the enable signal at the enable end of the BOOST circuit is higher than the enable threshold set by the BOOST circuit. The enable control IO end of the MCU controls the enablement of the BOOST circuit. The BOOT short circuit detection and control enablement can be realized through the enable control IO end of the MCU, without occupying additional IO resources, thereby reducing costs.

[0032] In a further implementation scheme, the BOOST circuit is an asynchronous BOOST circuit; the wake-up unit includes a transistor, a fifth resistor and a sixth resistor, the fifth resistor is connected between the collector of the transistor and the ground, the sixth resistor is connected between the base of the transistor and the power input terminal of the BOOST circuit, and the emitter of the transistor is connected to the power supply; the collector of the transistor is also connected to the wake-up control IO terminal of the MCU.

[0033] The inductor unit includes a first inductor connected between a power input terminal and an inductance measuring terminal of the asynchronous BOOST circuit, and a first diode forwardly connected between the inductance measuring terminal and a signal output terminal of the asynchronous BOOST circuit.

[0034] The wake-up unit in the technical solution outputs a wake-up signal after turning on the transistor, thereby controlling the wake-up control IO terminal of the MCU, thereby waking up the MCU through the BOOST protection and load detection circuit, thereby protecting the BOOST circuit.

[0035] In a further implementation scheme, the BOOST circuit is a synchronous BOOST circuit; the wake-up unit includes a seventh resistor and an eighth resistor sequentially connected in series between the drain of the second MOS tube and the ground, and a capacitor connected in parallel between the eighth resistor; the source of the second MOS tube is connected to the power supply, the gate of the second MOS tube is connected to the power input end of the BOOST circuit, and the drain of the second MOS tube is also connected to the wake-up control IO end of the MCU.

[0036] The inductor unit includes a second inductor connected between the power input terminal and the inductance measuring terminal of the synchronous BOOST circuit; the synchronous BOOST circuit is provided with a second diode forwardly connected between the inductance measuring terminal and the signal output terminal thereof, and a third MOS tube; the source and drain of the third MOS tube are respectively connected to the positive and negative electrodes of the second diode.

[0037] The synchronous BOOST circuit in the present technical solution has the second diode integrated inside, so there is no need to connect the second diode externally; at the same time, after the second MOS tube is turned on, the wake-up unit controls the wake-up control IO terminal of the MCU through the output wake-up signal, thereby waking up the MCU through the BOOST protection and load detection circuit, thereby achieving the purpose of protecting the BOOST circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of a BOOST protection and load detection circuit structure provided by an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of a BOOST protection and load detection circuit connection provided by Embodiment 1 of the present invention;

[0040] Figure 3 This is a connection principle diagram of a BOOST protection and load detection circuit provided in Embodiment 2 of the present invention.

[0041] Graphic annotation:

[0042] MCU1; BOOST input protection and load detection circuit 2;

[0043] BOOST circuit 3 (asynchronous BOOST circuit 31, synchronous BOOST circuit 32);

[0044] Power input unit 4; BOOST control unit 5;

[0045] Awakening unit 6 (a first awakening unit 61 and a second awakening unit 62);

[0046] Inductor unit 7 (first inductor unit 71, second inductor unit 72);

[0047] BOOST enables adjustment unit 8. DETAILED DESCRIPTION

[0048] The following specifically illustrates the implementation mode of the present invention in conjunction with the accompanying drawings. The embodiments are provided for illustrative purposes only and cannot be understood as limiting the present invention. The accompanying drawings are provided for reference and illustration only and do not constitute a limitation on the scope of patent protection of the present invention, because many changes can be made to the present invention without departing from the spirit and scope of the present invention.

[0049] In view of the problem that the existing BOOST control enabling and protection circuits occupy more MCU IO ports and cannot detect the load while protecting BOOST, an embodiment of the present invention provides a BOOST protection and load detection circuit, such as Figure 1The structural schematic diagram shown includes an MCU1, and a BOOST circuit 3 and a BOOST input protection and load detection circuit 2 connected to the MCU1 and connected to each other;

[0050] The BOOST input protection and load detection circuit 2 is used to detect the load connected to the BOOST circuit 3 and output a wake-up signal WAKEUP to wake up the MCU1 when it is detected that the load reaches a certain voltage value;

[0051] The MCU1 is used to detect the enable signal EN&COMP output by the BOOST circuit 3 in real time after being awakened;

[0052] The MCU1 is also used to control the BOOST circuit 3 to be enabled when it detects that the enable signal EN&COMP output by the BOOST circuit 3 is lower than the BOOST protection threshold, and output a BOOST control signal BOOST_CTL to control the input of the BOOST input protection and load detection circuit 2 to the BOOST circuit 3.

[0053] The BOOST input protection and load detection circuit 2 includes:

[0054] A power input unit 4 connected between a power source BAT and a power input terminal BOOSTIN of the BOOST circuit 3;

[0055] A BOOST control unit 5 connected between a power source BAT, a power input terminal BOOSTIN of the BOOST circuit 3 and a BOOST control IO terminal IO2 of the MCU1;

[0056] A wake-up unit 6 connected between a power source BAT, a power input terminal BOOSTIN of the BOOST circuit 3 and a ground GND;

[0057] The BOOST circuit 3 comprises:

[0058] An inductor unit 7 connected between the power input terminal BOOSTIN and the signal output terminal VOUT of the BOOST circuit 3;

[0059] A BOOST enable adjustment unit 8 is connected between the signal output terminal VOUT, the enable terminal EN and the ground GND of the BOOST circuit 3 .

[0060] The power input unit 4 includes a first resistor R1 connected between the power supply BAT and the power input terminal BOOSTIN of the BOOST circuit 3. By adjusting the resistance value of the first resistor R1, the current input to the BOOST circuit 3 is changed, thereby realizing input protection of the BOOST circuit 3.

[0061] The BOOST control unit 5 includes a first MOS transistor P1 and a second resistor R2, wherein the source of the first MOS transistor P1 is connected to the power supply BAT, the drain D of the first MOS transistor P1 is connected to the power input terminal BOOSTIN of the BOOST circuit 3, the gate G of the first MOS transistor P1 is connected to the BOOST control IO terminal IO2 of the MCU1; the second resistor R2 is connected between the gate G and the source S of the first MOS transistor P1. In the normal load state, the first MOS transistor P1 is turned on to provide power to the load connected to the BOOST circuit 3 normally, so that the BOOST circuit 3 has sufficient load capacity. The second resistor R2 is used to prevent electrostatic breakdown. The resistance value between the gate G and the source S of the field effect tube is very large. As long as there is a small amount of static electricity, a very high voltage can be generated at both ends of the equivalent capacitor between its gate G and source S. If this small amount of static electricity is not discharged in time, the high voltage at both ends may cause the field effect tube to malfunction, and may even break down its gate G and source S. The second resistor R2 is connected between the gate and the source to discharge the static electricity, and the voltage is not enough to break down the two poles, thereby playing a protective role.

[0062] The first MOS transistor P1 is a P-channel MOS transistor.

[0063] The BOOST enable adjustment unit 8 includes a third resistor R3 and a fourth resistor R4 which are sequentially connected in series between the signal output terminal VOUT of the BOOST circuit 3 and the ground GND, and the enable terminal EN of the BOOST circuit 3 is connected to the common connection terminal of the third resistor R3 and the fourth resistor R4; the enable terminal EN of the BOOST circuit 3 is also connected to the enable control IO terminal IO3 of the MCU1; the embodiment of the present invention controls the voltage at the enable terminal EN of the BOOST circuit 3 by adjusting the resistance values ​​of the third resistor R3 and the fourth resistor R4.

[0064] Embodiment 1

[0065] like Figure 2 The circuit connection principle diagram of the first embodiment of the present invention is shown;

[0066] In this embodiment, the BOOST circuit 3 is an asynchronous BOOST circuit 31; the wake-up unit 6 is a first wake-up unit 61, the first wake-up unit 61 includes a transistor Q1, a fifth resistor R5 and a sixth resistor R6, the fifth resistor R5 is connected between the collector of the transistor Q1 and the ground GND, the sixth resistor R6 is connected between the base B of the transistor Q1 and the power input terminal BOOSTIN of the BOOST circuit 3, the emitter E of the transistor Q1 is connected to the power supply BAT; the collector C of the transistor Q1 is also connected to the wake-up control IO terminal IO1 of the MCU1.

[0067] The inductor unit 7 is a first inductor unit 71, which includes a first inductor L1 connected between the power input terminal BOOSTIN and the inductance measurement terminal LX of the asynchronous BOOST circuit, and a first diode D1 forwardly connected between the inductance measurement terminal LX and the signal output terminal VOUT of the asynchronous BOOST circuit.

[0068] The embodiment of the present invention divides the circuit into three working states, namely, normal working state, light load dormant state, and short circuit protection state. In the embodiment of the present invention, the MCU1 is awakened by the wake-up signal WAKEUP output by the BOOST input protection and load detection circuit 2, and the MCU1 is awakened by a high level; the BOOST circuit is enabled by a high level.

[0069] Under different working states, the level states of the BOOST control signal BOOST_CTL, the wake-up signal WAKEUP, and the enable signal EN&COMP at the IO port of the MCU1 are combined into a normal working state, a short circuit protection state, and a light load sleep state, as shown in Table 1:

[0070] Table 1

[0071]

[0072] 1) The working principle under the normal working state is as follows:

[0073] In the normal working state, the BOOST control signal BOOST_CTL input to the BOOST input protection and load detection circuit by the MCU1 through the BOOST control IO terminal IO2 is at a low level. At this time, the first MOS transistor P1 is turned on, and the current input to the asynchronous BOOST circuit flows through the first MOS transistor P1. The first resistor R1 is short-circuited by the first MOS transistor P1. Therefore, the voltage at the power supply BAT and the voltage at the power input terminal BOOSTIN of the asynchronous BOOST circuit are in the following relationship: BAT=BOOSTIN. At this time, the asynchronous BOOST circuit has sufficient load-carrying capacity and can provide power to the load normally.

[0074] Under normal working conditions, the enable signal EN&COMP of the enable control IO terminal IO3 of the MCU1 is in high impedance mode. Before the asynchronous BOOST circuit is turned on, the current input to the power input terminal BOOSTIN of the asynchronous BOOST circuit passes through the first inductor L1 and the first diode D1, wherein the first diode D1 is a Schottky diode with a voltage drop of approximately 0.3V. Therefore, the voltage of the enable signal EN&COMP is derived from the following formula:

[0075] VOUT = BOOSTIN - diode voltage drop = BAT - 0.3V; (1)

[0076] EN&COMP=VOUT / (1+R3 / R4)=(BAT-0.3) / (1+R3 / R4); (2)

[0077] The resistance values ​​of the third resistor R3 and the fourth resistor R4 are adjusted so that the voltage of the enable signal EN&COMP is higher than the EN enable threshold at the asynchronous BOOST circuit interface, thereby normally starting the asynchronous BOOST circuit.

[0078] After the asynchronous BOOST circuit is enabled, the voltage of the signal output terminal VOUT is greater than the voltage of the power supply BAT. Therefore, the voltage value of the enable signal EN&COMP will also be greater than (BAT-0.3) / (1+R3 / R4), so that the BOOST circuit continues to be enabled and work normally.

[0079] 2) The working principle in the light load sleep state is as follows:

[0080] In the light-load sleep state, the enable signal EN&COMP=VOUT / (1+R3 / R4), and the asynchronous BOOST circuit is normally enabled; at the same time, in the light-load sleep state, the BOOST control signal BOOST_CTL is at a high level, the first MOS tube P1 is turned off, and the current input to the asynchronous BOOST circuit flows through the first resistor R1. Since the asynchronous BOOST circuit is in a light-load state at this time, the current flowing through the first resistor R1 is relatively small, and the voltage drop across the first resistor R1 is insufficient to turn on the transistor Q1, so that the wake-up signal WAKEUP output by the BOOST input protection and load detection circuit 2 is at a low level, and the MCU1 is not awakened.

[0081] When the load of the asynchronous BOOST circuit increases, and the voltage drop across the first resistor R1 in the BOOST input protection and load detection circuit 2 is able to turn on the transistor Q1, the BOOST input protection and load detection circuit 2 outputs the wake-up signal WAKEUP to the wake-up control IO terminal IO1 of the MCU1, thereby waking up the MCU1. At this time, the wake-up signal WAKEUP is at a high level. This principle realizes the load detection of the asynchronous BOOST circuit by the BOOST input protection and load detection circuit 2 and wakes up the MCU1.

[0082] In this embodiment, the wake-up control IO terminal IO1 of the MCU1 has a high level or rising edge wake-up function.

[0083] 3) The working principle under the short circuit protection state is as follows:

[0084] After the MCU1 is awakened, the voltage of the enable signal EN&COMP is detected in real time through the comparator COMP or the analog-to-digital converter ADC at its port. If the voltage value of the enable signal EN&COMP is lower than the short-circuit protection threshold of the asynchronous BOOST circuit, the asynchronous BOOST circuit is judged to be short-circuited. After the MCU1 detects that the asynchronous BOOST circuit is short-circuited, the MCU1 switches the input mode of the enable control IO terminal IO3 thereof, and controls the BOOST circuit to be disabled by outputting the enable signal EN&COMP. At this time, the enable signal EN&COMP is at a low level, so that the short-circuit detection and control enable of the asynchronous BOOST circuit can be realized through the interface IO3 of the MCU1, thereby achieving the purpose of protecting the asynchronous BOOST circuit.

[0085] At the same time, the MCU1 controls the BOOST input protection and load detection circuit 2 through the BOOST control signal BOOST_CTL, so that the path from the power supply BAT to the power input terminal BOOSTIN of the asynchronous BOOST circuit is in a high impedance state, thereby realizing the input protection of the asynchronous BOOST circuit. The specific implementation principle of this step is: the MCU1 will increase the voltage of the BOOST control signal BOOST_CTL. At this time, due to the increase in the voltage of the BOOST control signal BOOST_CTL, the first MOS tube P1 in the BOOST input protection and load detection circuit 2 is turned off. Therefore, the current input to the asynchronous BOOST circuit flows through the first resistor R1. At this time, by adjusting the resistance value of the first resistor R1, the current of the power supply BAT flowing through the first resistor R1 is limited to a certain range, thereby realizing the input protection of the asynchronous BOOST circuit by the BOOST input protection and load detection circuit 2.

[0086] Embodiment 2

[0087] Figure 3 This is a circuit connection principle diagram of Embodiment 2 of the present invention;

[0088] The BOOST circuit 3 in this embodiment is a synchronous BOOST circuit 32; the wake-up unit 6 is a second wake-up unit 62, which includes a seventh resistor R7 and an eighth resistor R8 connected in series between the drain D of the second MOS tube P2 and the ground GND, and a capacitor C1 connected in parallel between the eighth resistor R8; the source S of the second MOS tube P2 is connected to the power supply BAT, the gate G of the second MOS tube P2 is connected to the power input terminal BOOSTIN of the synchronous BOOST circuit, and the drain D of the second MOS tube P2 is also connected to the wake-up control IO terminal IO1 of the MCU1.

[0089] The capacitor C1 is used to form an RC filter circuit with the eighth resistor R8 for filtering.

[0090] The inductor unit 7 in this embodiment is a second inductor unit 72, which includes a second inductor L2 connected between the power input terminal BOOSTIN and the inductance measuring terminal LX of the synchronous BOOST circuit; the synchronous BOOST circuit is provided with a second diode D2 forwardly connected between the inductance measuring terminal LX and the signal output terminal VOUT thereof, and a third MOS transistor P3; the source S and the drain D of the third MOS transistor P3 are respectively connected to the positive and negative electrodes of the second diode D2.

[0091] In this embodiment, the second MOS transistor P2 and the third MOS transistor P3 are preferably P-channel MOS transistors. The second diode D2 is integrated in the synchronous BOOST circuit, so there is no need to connect the first diode D1 externally as in the first embodiment.

[0092] In addition, in this embodiment, the circuit can also be divided into three working states, namely, normal working state, light load sleep state, and short circuit protection state. Its working principle is the same as that of embodiment 1 and will not be repeated here.

[0093] A BOOST protection and load detection circuit provided in an embodiment of the present invention combines the BOOST protection circuit and the load detection through an MCU1, and a BOOST circuit 3 and a BOOST input protection and load detection circuit 2 connected to the MCU1 and connected to each other, thereby solving the problem that the existing BOOST control enabling and protection circuit occupies more IO ports of the MCU1 and cannot detect the load while protecting the BOOST. The BOOST input protection and load detection circuit 2 provides load detection for the BOOST circuit 3, and provides fast and effective protection for the BOOST circuit 3 under abnormal conditions such as overvoltage and short circuit. The MCU1 realizes short-circuit detection of the BOOST circuit 3 and controls the enabling of the BOOST circuit 3 through a single IO, without occupying additional IO resources, reducing costs, and the entire circuit is simple and highly reliable.

[0094] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A BOOST protection and load detection circuit, characterized in that: It includes an MCU, a BOOST circuit and a BOOST input protection and load detection circuit connected to the MCU and connected to each other; The BOOST input protection and load detection circuit is used to detect the load connected to the BOOST circuit and wake up the MCU when it is detected that the load reaches a certain voltage value; The MCU is used to detect the enable signal output by the BOOST circuit in real time after being awakened; The MCU is also used to control the BOOST circuit to enable when it is detected that the enable signal output by the BOOST circuit is lower than the BOOST protection threshold, and output a BOOST control signal to control the input of the BOOST circuit by the BOOST input protection and load detection circuit; The BOOST input protection and load detection circuit includes: A power input unit connected between a power source and a power input terminal of the BOOST circuit; A BOOST control unit connected between a power supply, a power input terminal of the BOOST circuit and a BOOST control IO terminal of the MCU; A wake-up unit connected between a power supply, a power input terminal of the BOOST circuit and ground; The BOOST circuit includes: An inductor unit connected between a power input terminal and a signal output terminal of the BOOST circuit; A BOOST enable adjustment unit connected between the signal output terminal, the enable terminal and the ground of the BOOST circuit; The power input unit comprises a first resistor connected between the power supply and a power input terminal of the BOOST circuit; The BOOST control unit includes a first MOS tube and a second resistor, the source of the first MOS tube is connected to the power supply, the drain of the first MOS tube is connected to the power input end of the BOOST circuit, the gate of the first MOS tube is connected to the BOOST control IO end of the MCU; the second resistor is connected between the gate and the source of the first MOS tube.

2. A BOOST protection and load detection circuit as claimed in claim 1, characterized in that: The BOOST enable adjustment unit includes a third resistor and a fourth resistor sequentially connected in series between the signal output end of the BOOST circuit and the ground, the enable end of the BOOST circuit is connected to the common connection end of the third resistor and the fourth resistor; the enable end of the BOOST circuit is also connected to the enable control IO end of the MCU.

3. A BOOST protection and load detection circuit as claimed in claim 2, characterized in that: The BOOST circuit is an asynchronous BOOST circuit; the wake-up unit includes a transistor, a fifth resistor and a sixth resistor, the fifth resistor is connected between the collector of the transistor and the ground, the sixth resistor is connected between the base of the transistor and the power input end of the BOOST circuit, and the emitter of the transistor is connected to the power supply; the collector of the transistor is also connected to the wake-up control IO end of the MCU.

4. A BOOST protection and load detection circuit as claimed in claim 3, characterized in that: The inductor unit includes a first inductor connected between a power input terminal and an inductance measuring terminal of the asynchronous BOOST circuit, and a first diode forwardly connected between the inductance measuring terminal and a signal output terminal of the asynchronous BOOST circuit.

5. A BOOST protection and load detection circuit as claimed in claim 1, characterized in that: The BOOST circuit is a synchronous BOOST circuit; the wake-up unit includes a seventh resistor and an eighth resistor connected in series between the drain of the second MOS tube and the ground, and a capacitor connected in parallel between the eighth resistor; the source of the second MOS tube is connected to the power supply, the gate of the second MOS tube is connected to the power input end of the BOOST circuit, and the drain of the second MOS tube is also connected to the wake-up control IO end of the MCU.

6. A BOOST protection and load detection circuit as claimed in claim 5, characterized in that: The inductor unit includes a second inductor connected between the power input terminal and the inductance measuring terminal of the synchronous BOOST circuit; the synchronous BOOST circuit is provided with a second diode forwardly connected between the inductance measuring terminal and the signal output terminal thereof, and a third MOS tube; the source and drain of the third MOS tube are respectively connected to the positive and negative electrodes of the second diode.

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