MCU safe and stable voltage supply power supply circuit

Abstract

The application discloses an MCU safe and stable voltage power supply circuit and relates to the technical field of MCU power supply. The MCU safe and stable voltage power supply circuit comprises a first voltage stabilizing module, a second voltage stabilizing module, an output detection module and a current expansion processing module. The first voltage stabilizing module and the second voltage stabilizing module provide required multi-path stable voltage power for an MCU module. The output detection module detects high voltage or low voltage of the first voltage stabilizing module and the second voltage stabilizing module according to set high voltage threshold and low voltage threshold. When high voltage or low voltage occurs in the first voltage stabilizing module, the current expansion processing module controls the first voltage stabilizing module to be powered off and performs current expansion processing on the second voltage stabilizing module, so that the second voltage stabilizing module maintains multi-path power supply for the MCU module. When high voltage or low voltage occurs in the second voltage stabilizing module, the second voltage stabilizing module is powered off and performs current expansion processing on the first voltage stabilizing module, so that the first voltage stabilizing module maintains multi-path power supply for the MCU module. Compared with the prior art, the MCU safe and stable voltage power supply circuit has the beneficial effects that the power supply safety and power supply efficiency for the MCU module are improved.

Description

Technical Field

[0001] This invention relates to the field of MCU power supply technology, specifically a safe and regulated power supply circuit for MCUs. Background Technology

[0002] MCU, or Microcontroller Unit, also known as a single-chip microcomputer, is a microcomputer that integrates the central processing unit, memory, input / output interfaces, and other major components of a computer onto a single chip. A typical MCU usually has multiple power ports to power different modules within the chip, achieving better noise suppression and performance. To achieve multiple power supplies, multiple voltage regulators are generally used for voltage regulation. However, when one voltage regulator fails, the voltage regulators cannot perform mutual safe voltage regulation control, which will result in the MCU's power requirements not being met. Therefore, this issue needs to be addressed. Summary of the Invention

[0003] This invention provides a safe and regulated power supply circuit for an MCU to solve the problems mentioned in the background art.

[0004] According to an embodiment of the present invention, a safe and regulated power supply circuit for an MCU is provided, comprising: a power supply module, a first voltage regulator module, a second voltage regulator module, an output detection module, a current amplification processing module, and an MCU module; The power module is used to connect to DC power. The first voltage regulator module is connected to the power supply module and is used to regulate and adjust the DC power and output the first power, sample the first power and output the first sampling signal. The second voltage regulator module is connected to the power supply module and is used to regulate and adjust the DC power and output the second power, sample the second power and output the second sampling signal. The output detection module is connected to the first voltage regulator module and the second voltage regulator module. It is used to set the high voltage threshold and the low voltage threshold, and outputs the first control signal when the first sampling signal is less than the low voltage threshold or higher than the high voltage threshold, and outputs the second control signal when the second sampling signal is less than the low voltage threshold or higher than the high voltage threshold. The current amplification processing module is connected to the output detection module, the first voltage regulator module, the second voltage regulator module, the MCU module, and the power supply module. It is used to receive DC power and, upon receiving the first control signal, amplify the second power and output the third power, control the first voltage regulator module to stop receiving DC power and transmit the third power to the MCU module. Upon receiving the second control signal, it amplifies the first power and outputs the fourth power, control the second voltage regulator module to stop receiving DC power and transmit the fourth power to the MCU module. The MCU module is connected to the first voltage regulator module and the second voltage regulator module. It is used to connect to the first power supply terminal and the second power supply terminal of the connected MCU through the first power supply port and the second power supply port, respectively. It receives first electrical energy or fourth electrical energy through the first power supply port and second electrical energy or third electrical energy through the second power supply port.

[0005] As a further embodiment of the present invention: the power supply module includes a power interface and a first capacitor; the first voltage regulator module includes a first power transistor, a first resistor, a first switching transistor, a first voltage regulator, a third resistor, a second resistor, a fourth resistor, and a first diode; the MCU module includes an MCU power interface; Preferably, the first end of the power supply port is connected to the drain of the first power transistor and one end of the first capacitor, and is connected to the gate of the first power transistor and the collector of the first switching transistor through the first resistor. The source of the first power transistor is connected to the third end of the first voltage regulator. The second end of the first voltage regulator is connected to the first end of the second resistor and the anode of the first diode. The cathode of the first diode is connected to the first power supply terminal of the MCU power interface. The second end of the second resistor is connected to the first end of the first voltage regulator, and is connected to the other end of the first capacitor, the emitter of the first switching transistor, the second end of the power interface, the ground terminal and the ground terminal of the MCU power interface through the third resistor. The base of the first switching transistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the output detection module.

[0006] As a further embodiment of the present invention: the second voltage regulator module includes a fifth resistor, a second switching transistor, a second power transistor, a second voltage regulator, a sixth resistor, a seventh resistor, an eighth resistor, and a second diode; Preferably, the drain of the second power transistor is connected to the first terminal of the power interface and is connected to the gate of the second power transistor and the collector of the second switching transistor through the fifth resistor. The source of the second power transistor is connected to the third terminal of the second voltage regulator. The second terminal of the second voltage regulator is connected to the anode of the second diode and the first terminal of the seventh resistor. The second terminal of the seventh resistor is connected to the first terminal of the first voltage regulator and is connected to the emitter of the second switching transistor and the second terminal of the power interface through the sixth resistor. The cathode of the second diode is connected to the second power terminal of the MCU power interface. The base of the second switching transistor is connected to the first terminal of the eighth resistor. The second terminal of the eighth resistor is connected to the output detection module.

[0007] As a further embodiment of the present invention: the current amplification processing module includes a first thyristor, a third switching transistor, a second thyristor, a fourth diode, and a third thyristor; Preferably, the anode of the first thyristor is connected to the anode of the first diode, the cathode of the first thyristor is connected to the base of the third switching transistor, the collector of the third switching transistor is connected to the first terminal of the power interface, the emitter of the third switching transistor is connected to the anode of the second thyristor, the cathode of the second thyristor is connected to the cathode of the first diode and one end of the third thyristor, the control terminal of the first thyristor is connected to the control terminal of the second thyristor, the second terminal of the eighth resistor and the anode of the fourth diode, the cathode of the fourth diode is connected to the control terminal of the third thyristor, and the other end of the third thyristor is connected to the cathode of the second diode.

[0008] As a further embodiment of the present invention: the current amplification processing module also includes a fourth thyristor, a fifth thyristor, and a third diode; Preferably, the cathode of the fourth thyristor is connected to the base of the third switching transistor, the anode of the fourth thyristor is connected to the anode of the second diode, the control terminal of the fourth thyristor is connected to the control terminal of the fifth thyristor, the anode of the third diode and the second terminal of the fourth resistor, the cathode of the third diode is connected to the control terminal of the third thyristor, the anode of the fifth thyristor is connected to the emitter of the third switching transistor, and the cathode of the fifth thyristor is connected to the cathode of the second diode.

[0009] As a further embodiment of the present invention: the output detection module includes a first reference power supply, a second reference power supply, a first comparator, a second comparator, a fourth switching transistor, a first voltage regulator, and a ninth resistor; Preferably, the inverter of the first comparator is connected to the non-inverting terminal of the second comparator and the second terminal of the second resistor. The inverting terminal of the first comparator and the non-inverting terminal of the second comparator are respectively connected to the second reference power supply and the first reference power supply. The output terminal of the first comparator is connected to the output terminal of the second comparator and the base of the fourth switching transistor. The collector of the fourth switching transistor is connected to the first regulated power supply. The emitter of the fourth switching transistor is connected to the second terminal of the fourth resistor and grounded through the ninth resistor.

[0010] As a further embodiment of the present invention, the output detection module also includes a fault detection device; Preferably, the input terminal of the fault detection device is connected to the second terminal of the seventh resistor, and the output terminal of the fault detection device is connected to the second terminal of the eighth resistor.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: The MCU safe voltage regulation power supply circuit of the present invention can provide the required multi-channel regulated power to the MCU module by the first voltage regulation module and the second voltage regulation module respectively. The output detection module performs high voltage or low voltage detection on the first voltage regulation module and the second voltage regulation module respectively according to the set high voltage threshold and low voltage threshold. When the first voltage regulation module has high voltage or low voltage, the current amplification processing module controls the first voltage regulation module to be powered off and performs current amplification processing on the second voltage regulation module so that the second voltage regulation module can maintain multi-channel power supply to the MCU module. When the second voltage regulation module has high voltage or low voltage, the current amplification processing module controls the second voltage regulation module to be powered off and performs current amplification processing on the first voltage regulation module so that the first voltage regulation module can maintain multi-channel power supply to the MCU module, thereby improving the power supply safety and power supply efficiency of the MCU module. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic block diagram of a safe and regulated power supply circuit for an MCU provided in an embodiment of the present invention.

[0014] Figure 2 This is a circuit diagram of a safe and regulated power supply circuit for an MCU provided in an embodiment of the present invention.

[0015] Figure 3 This is a first circuit diagram of the output detection module provided in an embodiment of the present invention.

[0016] Figure 4 This is a second circuit diagram of the output detection module provided in an embodiment of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In one embodiment, see Figure 1 A safe and regulated power supply circuit for an MCU includes: a power module 1, a first voltage regulator module 2, a second voltage regulator module 3, an output detection module 4, a current amplification processing module 5, and an MCU module 6. Power module 1 is used to connect to DC power. The first voltage regulator module 2 is connected to the power supply module 1 and is used to regulate the DC power and output the first power, sample the first power and output the first sampling signal. The second voltage regulator module 3 is connected to the power supply module 1 and is used to regulate the DC power and output the second power, sample the second power and output the second sampling signal. The output detection module 4 is connected to the first voltage regulator module 2 and the second voltage regulator module 3. It is used to set the high voltage threshold and the low voltage threshold, and outputs the first control signal when the first sampling signal is less than the low voltage threshold or higher than the high voltage threshold, and outputs the second control signal when the second sampling signal is less than the low voltage threshold or higher than the high voltage threshold. The current amplification processing module 5 is connected to the output detection module 4, the first voltage regulator module 2, the second voltage regulator module 3, the MCU module 6, and the power supply module 1. It is used to receive DC power and, upon receiving the first control signal, amplify the second power and output the third power, control the first voltage regulator module 2 to stop receiving DC power and transmit the third power to the MCU module 6. Upon receiving the second control signal, it amplifies the first power and outputs the fourth power, control the second voltage regulator module 3 to stop receiving DC power and transmit the fourth power to the MCU module 6. MCU module 6 is connected to the first voltage regulator module 2 and the second voltage regulator module 3. It is used to connect to the first power supply terminal and the second power supply terminal of the connected MCU through the first power supply port and the second power supply port respectively. It receives the first power or the fourth power through the first power supply port and the second power or the third power through the second power supply port.

[0019] In a specific embodiment, the power supply module 1 can be a power circuit composed of a power interface and a capacitor to receive DC power; the first voltage regulator module 2 can be a first voltage regulator circuit composed of a voltage regulator, a field-effect transistor, a resistor, a transistor, etc., which can perform power transmission control and voltage regulation control; the second voltage regulator module 3 can be a second voltage regulator circuit composed of a voltage regulator, a field-effect transistor, a resistor, a transistor, etc., which can perform power transmission control and voltage regulation control; the output detection module 4 can be an output detection circuit composed of a comparator, a reference power supply, a transistor, etc., which can set a high voltage threshold and a low voltage threshold and adjust the output voltage according to the voltage level. The input signal is compared with the voltage to determine whether the first voltage regulator module 2 and the second voltage regulator module 3 have high or low voltage. When high or low voltage occurs, a high-level signal is output. The current amplification processing module 5 can be a current amplification processing circuit composed of thyristors, transistors and diodes. It can amplify the current of the first voltage regulator module 2 or the second voltage regulator module 3 by changing the power transmission path. The MCU module 6 can be an MCU circuit composed of an MCU power interface. The first power terminal and the second power terminal of the MCU power interface are respectively connected to the first power terminal and the second power terminal of the connected MCU.

[0020] In this embodiment, please refer to Figure 2 , Figure 3 and Figure 4 The power module 1 includes a power interface and a first capacitor C1; the first voltage regulator module 2 includes a first power transistor Q1, a first resistor R1, a first switching transistor V1, a first voltage regulator IC1, a third resistor R3, a second resistor R2, a fourth resistor R4, and a first diode D1; the MCU module 6 includes an MCU power interface. Specifically, the first end of the power supply port is connected to the drain of the first power transistor Q1 and one end of the first capacitor C1, and is connected to the gate of the first power transistor Q1 and the collector of the first switching transistor V1 through the first resistor R1. The source of the first power transistor Q1 is connected to the third end of the first voltage regulator. The second end of the first voltage regulator is connected to the first end of the second resistor R2 and the anode of the first diode D1. The cathode of the first diode D1 is connected to the first power supply terminal of the MCU power interface. The second end of the second resistor R2 is connected to the first end of the first voltage regulator, and is connected to the other end of the first capacitor C1, the emitter of the first switching transistor V1, the second end of the power interface, the ground terminal and the ground terminal of the MCU power interface through the third resistor R3. The base of the first switching transistor V1 is connected to the first end of the fourth resistor R4. The second end of the fourth resistor R4 is connected to the output detection module 4.

[0021] In a specific embodiment, the first power transistor Q1 can be an N-channel MOSFET; the first voltage regulator can be an LM317 voltage regulator; and the first switching transistor V1 can be an NPN transistor.

[0022] Furthermore, the second voltage regulator module 3 includes a fifth resistor R5, a second switching transistor V2, a second power transistor Q2, a second voltage regulator IC2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a second diode D2; Specifically, the drain of the second power transistor Q2 is connected to the first terminal of the power interface and is connected to the gate of the second power transistor Q2 and the collector of the second switching transistor V2 through the fifth resistor R5. The source of the second power transistor Q2 is connected to the third terminal of the second voltage regulator IC2. The second terminal of the second voltage regulator IC2 is connected to the anode of the second diode D2 and the first terminal of the seventh resistor R7. The second terminal of the seventh resistor R7 is connected to the first terminal of the first voltage regulator and is connected to the emitter of the second switching transistor V2 and the second terminal of the power interface through the sixth resistor R6. The cathode of the second diode D2 is connected to the second power terminal of the MCU power interface. The base of the second switching transistor V2 is connected to the first terminal of the eighth resistor R8. The second terminal of the eighth resistor R8 is connected to the output detection module 4.

[0023] In a specific embodiment, the second power transistor Q2 can be an N-channel MOSFET; the second switching transistor V2 can be an NPN transistor; and the second voltage regulator IC2 can be an LM317 voltage regulator, which must be equal to the output voltage of the first voltage regulator.

[0024] Furthermore, the current amplification processing module 5 includes a first thyristor S1, a third switch V3, a second thyristor S2, a fourth diode D4, and a third thyristor S3; Specifically, the anode of the first thyristor S1 is connected to the anode of the first diode D1, the cathode of the first thyristor S1 is connected to the base of the third switch V3, the collector of the third switch V3 is connected to the first terminal of the power interface, the emitter of the third switch V3 is connected to the anode of the second thyristor S2, the cathode of the second thyristor S2 is connected to the cathode of the first diode D1 and one end of the third thyristor S3, the control terminal of the first thyristor S1 is connected to the control terminal of the second thyristor S2, the second terminal of the eighth resistor R8 and the anode of the fourth diode D4, the cathode of the fourth diode D4 is connected to the control terminal of the third thyristor S3, and the other end of the third thyristor S3 is connected to the cathode of the second diode D2.

[0025] In a specific embodiment, the first thyristor S1 and the second thyristor S2 can both be unidirectional thyristors; the third switch V3 can be an NPN transistor; and the third thyristor S3 can be a bidirectional thyristor.

[0026] Furthermore, the current amplification processing module 5 also includes a fourth thyristor S4, a fifth thyristor S5, and a third diode D3; Specifically, the cathode of the fourth thyristor S4 is connected to the base of the third switching transistor V3, the anode of the fourth thyristor S4 is connected to the anode of the second diode D2, the control terminal of the fourth thyristor S4 is connected to the control terminal of the fifth thyristor S5, the anode of the third diode D3 and the second terminal of the fourth resistor R4, the cathode of the third diode D3 is connected to the control terminal of the third thyristor S3, the anode of the fifth thyristor S5 is connected to the emitter of the third switching transistor V3, and the cathode of the fifth thyristor S5 is connected to the cathode of the second diode D2.

[0027] In a specific embodiment, both the fourth thyristor S4 and the fifth thyristor S5 can be selected as unidirectional thyristors.

[0028] Furthermore, the output detection module 4 includes a first reference power supply VF1, a second reference power supply VF2, a first comparator A1, a second comparator A2, a fourth switch V4, a first voltage regulator VCC1, and a ninth resistor R9. Specifically, the inverter of the first comparator A1 is connected to the non-inverting input of the second comparator A2 and the second terminal of the second resistor R2. The inverting input of the first comparator A1 and the non-inverting input of the second comparator A2 are respectively connected to the second reference power supply VF2 and the first reference power supply VF1. The output terminal of the first comparator A1 is connected to the output terminal of the second comparator A2 and the base of the fourth switching transistor V4. The collector of the fourth switching transistor V4 is connected to the first regulated power supply VCC1. The emitter of the fourth switching transistor V4 is connected to the second terminal of the fourth resistor R4 and grounded through the ninth resistor R9.

[0029] In a specific embodiment, the first reference power supply VF1 is set to a high voltage threshold, and the second reference power supply VF2 is set to a low voltage threshold; the first comparator A1 and the second comparator A2 can both be LM317 comparators; the fourth switching transistor V4 can be an NPN transistor.

[0030] Furthermore, the output detection module 4 also includes a fault detection device; Specifically, the input terminal of the fault detection device is connected to the second terminal of the seventh resistor R7, and the output terminal of the fault detection device is connected to the second terminal of the eighth resistor R8.

[0031] In a specific embodiment, the circuit structure of the fault detection device is the same as that of the first reference power supply VF1, the second reference power supply VF2, the first comparator A1, the second comparator A2, the fourth switch V4, the first voltage regulator VCC1, and the ninth resistor R9.

[0032] In this embodiment of a safe and regulated MCU power supply circuit, DC power is connected through a power interface. A first resistor R1 triggers a first power transistor Q1 to transmit DC power, and a fifth resistor R5 triggers a second power transistor Q2 to transmit DC power. This allows a first voltage regulator to work with the second resistor R2 and the third resistor R3 to regulate the voltage and output the first power. A second voltage regulator IC2 works with the sixth resistor R6 and the seventh resistor R7 to regulate the voltage and output the second power. The first and second power supplies are respectively transmitted to the first and second power terminals of the MCU power interface. A first comparator A1, a second comparator A2, a first reference power supply VF1, and a second reference power supply VF2 perform high-voltage or low-voltage detection on the signal after voltage division by the second resistor R2 and the third resistor R3. Under high voltage, the first comparator A1 outputs a high level; under low voltage, the second comparator A2 outputs a low level. A high-level signal is output, controlling the fourth switch V4 to conduct, which in turn triggers the first switch V1, the fourth thyristor S4, the fifth thyristor S5, and the third thyristor S3 to conduct, which in turn triggers the third switch V3 to conduct. The second electrical energy is amplified and output as a third electrical energy. This third electrical energy is transmitted to the second power supply terminal of the MCU power interface and then to the first power supply terminal of the MCU power interface through the third thyristor S3. Similarly, when the fault detection device detects a high or low voltage condition in the output of the second electrical energy, it will also output a high-level signal to trigger the first thyristor S1, the second thyristor S2, the second switch V2, and the third thyristor S3 to conduct. The third switch V3 amplifies the first electrical energy and outputs as a fourth electrical energy, which is transmitted to the first and second power supply terminals of the MCU power interface to maintain the power supply to the MCU connected to the MCU power interface.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A safe and regulated power supply circuit for an MCU, characterized in that, The circuit includes: a power supply module, a first voltage regulator module, a second voltage regulator module, an output detection module, a current amplification module, and an MCU module; The power module is used to connect to DC power. The first voltage regulator module is connected to the power supply module and is used to regulate and adjust the DC power and output the first power, sample the first power and output the first sampling signal. The second voltage regulator module is connected to the power supply module and is used to regulate and adjust the DC power and output the second power, sample the second power and output the second sampling signal. The output detection module is connected to the first voltage regulator module and the second voltage regulator module. It is used to set the high voltage threshold and the low voltage threshold, and outputs the first control signal when the first sampling signal is less than the low voltage threshold or higher than the high voltage threshold, and outputs the second control signal when the second sampling signal is less than the low voltage threshold or higher than the high voltage threshold. The current amplification processing module is connected to the output detection module, the first voltage regulator module, the second voltage regulator module, the MCU module, and the power supply module. It is used to receive DC power and, upon receiving the first control signal, amplify the second power and output the third power, control the first voltage regulator module to stop receiving DC power and transmit the third power to the MCU module. Upon receiving the second control signal, it amplifies the first power and outputs the fourth power, control the second voltage regulator module to stop receiving DC power and transmit the fourth power to the MCU module. The MCU module is connected to the first voltage regulator module and the second voltage regulator module. It is used to connect to the first power supply terminal and the second power supply terminal of the connected MCU through the first power supply port and the second power supply port, respectively. It receives first electrical energy or fourth electrical energy through the first power supply port and receives second electrical energy or third electrical energy through the second power supply port.

2. The MCU safe voltage regulation power supply circuit according to claim 1, characterized in that, The power module includes a power interface and a first capacitor; the first voltage regulator module includes a first power transistor, a first resistor, a first switching transistor, a first voltage regulator, a third resistor, a second resistor, a fourth resistor, and a first diode; the MCU module includes an MCU power interface; The first end of the power port is connected to the drain of the first power transistor and one end of the first capacitor, and is connected to the gate of the first power transistor and the collector of the first switching transistor through the first resistor. The source of the first power transistor is connected to the third end of the first voltage regulator. The second end of the first voltage regulator is connected to the first end of the second resistor and the anode of the first diode. The cathode of the first diode is connected to the first power terminal of the MCU power interface. The second end of the second resistor is connected to the first end of the first voltage regulator, and is connected to the other end of the first capacitor, the emitter of the first switching transistor, the second end of the power interface, the ground terminal and the ground terminal of the MCU power interface through the third resistor. The base of the first switching transistor is connected to the first end of the fourth resistor. The second end of the fourth resistor is connected to the output detection module.

3. The MCU safe voltage regulation power supply circuit according to claim 2, characterized in that, The second voltage regulator module includes a fifth resistor, a second switching transistor, a second power transistor, a second voltage regulator, a sixth resistor, a seventh resistor, an eighth resistor, and a second diode; The drain of the second power transistor is connected to the first terminal of the power interface and is connected to the gate of the second power transistor and the collector of the second switching transistor through the fifth resistor. The source of the second power transistor is connected to the third terminal of the second voltage regulator. The second terminal of the second voltage regulator is connected to the anode of the second diode and the first terminal of the seventh resistor. The second terminal of the seventh resistor is connected to the first terminal of the first voltage regulator and is connected to the emitter of the second switching transistor and the second terminal of the power interface through the sixth resistor. The cathode of the second diode is connected to the second power terminal of the MCU power interface. The base of the second switching transistor is connected to the first terminal of the eighth resistor. The second terminal of the eighth resistor is connected to the output detection module.

4. The MCU safe voltage regulation power supply circuit according to claim 3, characterized in that, The current amplification processing module includes a first thyristor, a third switching transistor, a second thyristor, a fourth diode, and a third thyristor. The anode of the first thyristor is connected to the anode of the first diode, the cathode of the first thyristor is connected to the base of the third switching transistor, the collector of the third switching transistor is connected to the first terminal of the power interface, the emitter of the third switching transistor is connected to the anode of the second thyristor, the cathode of the second thyristor is connected to the cathode of the first diode and one end of the third thyristor, the control terminal of the first thyristor is connected to the control terminal of the second thyristor, the second terminal of the eighth resistor and the anode of the fourth diode, the cathode of the fourth diode is connected to the control terminal of the third thyristor, and the other end of the third thyristor is connected to the cathode of the second diode.

5. The MCU safe voltage regulation power supply circuit according to claim 4, characterized in that, The current amplification processing module also includes a fourth thyristor, a fifth thyristor, and a third diode; The cathode of the fourth thyristor is connected to the base of the third switching transistor, the anode of the fourth thyristor is connected to the anode of the second diode, the control terminal of the fourth thyristor is connected to the control terminal of the fifth thyristor, the anode of the third diode and the second terminal of the fourth resistor, the cathode of the third diode is connected to the control terminal of the third thyristor, the anode of the fifth thyristor is connected to the emitter of the third switching transistor, and the cathode of the fifth thyristor is connected to the cathode of the second diode.

6. The MCU safe voltage regulation power supply circuit according to claim 5, characterized in that, The output detection module includes a first reference power supply, a second reference power supply, a first comparator, a second comparator, a fourth switching transistor, a first voltage regulator, and a ninth resistor. The inverter of the first comparator is connected to the non-inverting terminal of the second comparator and the second terminal of the second resistor. The inverting terminal of the first comparator and the non-inverting terminal of the second comparator are respectively connected to the second reference power supply and the first reference power supply. The output terminal of the first comparator is connected to the output terminal of the second comparator and the base of the fourth switch. The collector of the fourth switch is connected to the first voltage regulator. The emitter of the fourth switch is connected to the second terminal of the fourth resistor and grounded through the ninth resistor.

7. The MCU safe voltage regulation power supply circuit according to claim 6, characterized in that, The output detection module also includes a fault detection device; The input terminal of the fault detection device is connected to the second terminal of the seventh resistor, and the output terminal of the fault detection device is connected to the second terminal of the eighth resistor.

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