Low-power-consumption switching power supply converter based on Boost circuit

Abstract

The invention discloses a low-power-consumption switching power supply converter based on a Boost circuit. The output end of a band-gap reference source module is connected with one input end of an error amplifier module; the output end of the error amplifier module is connected with the input end of the bypass mode switching module; the output end of the zero-cross detection module is connected with the input end of the bypass mode switching module; the output end of the bypass mode switching module is connected with a signal input end of the RS trigger; the output end of the turn-on time generator module is connected with one signal input end of the RS trigger, and the input end of the turn-on time generator module is connected with the other signal output end of the RS trigger; and the other output end of the RS trigger is respectively connected with the control signal input end of the Boost power converter and the other input end of the error amplifier module. In the input voltage range, stable output voltage can be achieved, the conversion efficiency is kept at a high level in the full-load range, and the design requirements for low power consumption and high efficiency are met.

Description

Technical Field

[0001] The invention relates to the technical field of power converters, and in particular to a low-power switching power converter based on a Boost circuit. Background Art

[0002] In modern electronic devices, low power consumption design becomes increasingly important, especially in some portable and battery-powered devices. Boost switching power converters are widely used because they can achieve high efficiency and effectively increase input voltage.

[0003] However, traditional Boost switching power converters often face a trade-off between efficiency and stability during the design process. In the prior art, many Boost switching power converters have difficulty maintaining a stable output voltage when the load is changing, and the overall efficiency is reduced due to switching losses during the conversion process. In addition, traditional designs often use higher switching frequencies to improve conversion efficiency, but this can lead to additional electromagnetic interference (EMI) issues and heat generation, which in turn affects the overall reliability of the system. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a low-power switching power converter based on a Boost circuit to solve the technical problems of low efficiency, additional electromagnetic interference and excessive heat in the prior art.

[0005] The present invention provides a low-power switching power converter based on a Boost circuit, comprising: a bandgap reference source module, an error amplifier module, an on-time generator module, an RS trigger, a bypass mode switching module and a zero-crossing detection module;

[0006] The output end of the bandgap reference source module is connected to an input end of the error amplifier module, and the bandgap reference source module is used to provide a stable reference voltage signal; the output end of the error amplifier module is connected to the input end of the bypass mode switching module, and the error amplifier module is used to generate an error signal according to the reference voltage signal and the feedback signal; the output end of the zero-crossing detection module is connected to the input end of the bypass mode switching module, and the zero-crossing detection module is used to collect the inductance and current in the Boost power converter and form a detection signal; the output end of the bypass mode switching module is connected to a signal input end of the RS trigger, and the bypass mode switching module is used to generate a mode control signal according to the error signal and the detection signal; the output end of the on-time generator module is connected to a signal input end of the RS trigger, and the input end of the on-time generator module is connected to another signal output end of the RS trigger; the on-time generator module is used to intermittently generate a turn-on signal of the Boost power converter; the other output end of the RS trigger is respectively connected to the control signal input end of the Boost power converter and the other input end of the error amplifier module, and the RS trigger combines the mode control signal and the turn-on signal to generate a control signal of the Boost power converter, and the control signal is also used as a feedback signal for the error amplifier module.

[0007] Furthermore, the bandgap reference source module includes: a resistor R 11 , resistor R 12 , resistor R 13 , Bipolar transistor Q 11 , Bipolar transistor Q 12 、Operational amplifier A 11 ;

[0008] Resistor R 12 One end of each is connected to the operational amplifier A 11 The inverting input terminal and the resistor R 13 One end of the resistor R 13 The other end of the bipolar transistor Q 12 The collector connection of the bipolar transistor Q 12 The base and collector are short-circuited, and the emitter is grounded; the resistor R 11 One end of each is connected to the operational amplifier A 11 The non-inverting input terminal and the bipolar transistor Q 11 The collector connection of the bipolar transistor Q 11 The base and collector are short-circuited, and the emitter is grounded; operational amplifier A 11 The output terminals are connected to the resistor R 12 The other end of the resistor R11 and the ground are connected; the resistor R 13 Both ends are connected to external power supply; operational amplifier A 11 The output end of is used as the output end of the bandgap reference source module.

[0009] Furthermore, the error amplifier module includes: an NMOS tube M 41 、NMOS tube M 42 、NMOS tube M 43 、NMOS tube M 44 、NMOS tube M 45 And NMOS tube M 46 ;

[0010] NMOS tube M 41 The gate of the NMOS tube M is used as an input terminal of the error amplifier module; 41 The drain of NMOS tube M 43 The gate of NMOS tube M 44 The gate and NMOS tube M 44 The drain connection of NMOS tube M 41 The source of NMOS tube M 42 The source of NMOS tube M 45 The power supply VDD is connected to the drain of NMOS tube M 43 The source of NMOS tube M 44 The source of NMOS tube M 46 The drain connection of NMOS tube M 43 The drain of NMOS tube M 42 The drain of the NMOS tube M is connected as the output end of the error amplifier module; 42 The gate of the NMOS tube M is used as the other input terminal of the error amplifier module; 45 The gate of NMOS tube M 46 The gate and NMOS tube M 46 The drain connection of NMOS tube M 45 、NMOS tube M 46 The sources are grounded.

[0011] Furthermore, the conduction time generator module includes: an NMOS tube M 50 、NMOS tube M 51 、NMOS tube M 52 , resistor R C5 , resistor R 51 , resistor R 52 and the operating amplifier AMP; the power supply VDD is respectively connected to the NMOS tube M 51 The source of NMOS tube M 52 Source of NMOS tube M 51 The drain of NMOS tube M 51 The gate of NMOS tube M 52 The gate and NMOS tube M50 The drain source of NMOS tube M 52 The drain of is used as the output terminal of the on-time generator module; the resistor R 51 One end of the resistor R 51 The other end is connected to the non-inverting input of the operational amplifier AMP and the resistor R 52 One end of the resistor R 52 The other end is grounded; the output end of the operational amplifier AMP is connected to the NMOS tube M 50 The gate of the operational amplifier AMP is connected to the reverse input terminal of the NMOS tube M 50 The source and resistor R C5 One end of the resistor R C5 The other end is grounded.

[0012] Furthermore, the bypass mode switching module includes: an NMOS tube M 61 、NMOS tube M 62 、NMOS tube M 63 、NMOS tube M 64 、NMOS tube M 65 、NMOS tube M 66 、NMOS tube M 67 、NMOS tube M 68 、NMOS tube M 69 , resistor R 60 、Smit SMIT6、Inverter INV 61 and inverter INV 62 ;

[0013] The output of the error amplifier module is connected to the NMOS tube M 61 The output end of the zero-crossing detection module is connected to the gate of the NMOS tube M 62 The gate connection of NMOS tube M 61 The drain of NMOS tube M 63 The drain connection of NMOS tube M 63 The source of NMOS tube M 64 The source of NMOS tube M 69 The source connection of NMOS tube M 63 The gate of NMOS tube M 64 The gate connection of NMOS tube M 64 The drain of NMOS tube M 69 The gate and NMOS tube M 62 The drain connection of NMOS tube M 61 The source of the resistor R 60 One end and NMOS tube M 68The drain connection of 60 The other end is connected to the NMOS tube M 68 The source of NMOS tube M 66 The drain of NMOS tube M 62 The source connection of NMOS tube M 66 The gate of NMOS tube M 65 The gate of NMOS tube M 65 The drain of NMOS tube M 67 The gate connection of NMOS tube M 66 The source of NMOS tube M 65 The source of NMOS tube M 67 The source connection of NMOS tube M 67 The drain of NMOS tube M 69 The drain of the SMIT6 is connected to the input of the SMIT6; the output of the SMIT6 is connected to the inverter INV 61 The input end and NMOS tube M 68 Gate connection of inverter INV 61 The output terminal of the inverter INV 62 The input terminal of the inverter INV 62 The output end of is used as the output end of the bypass mode switching module.

[0014] Furthermore, the zero-crossing detection module includes: a resistor R 31 , resistor R 32 、NMOS tube M 31 、NMOS tube M 32 、NMOS tube M 33 、NMOS tube M 34 、Inverter INV 31 、Inverter INV 32 and inverter INV 33 ;

[0015] The preset comparison voltage is connected to the resistor R 31 One end of the resistor R 31 The other end is connected to the NMOS tube M 32 The source connection of NMOS tube M 32 The drain of NMOS tube M 34 The drain of the inverter INV 31 The input terminal is connected; the collected voltage of the inductor in the Boost power converter is connected to the resistor R 32 One end of the resistor R 32 The other end is connected to the NMOS tube M 31 The source connection of NMOS tube M 31 The drain of NMOS tube M31 The gate of NMOS tube M 32 The gate and NMOS tube M 33 The drain connection of NMOS tube M 33 The source of NMOS tube M 34 The source of NMOS tube M is connected and grounded; 34 The gate is biased.

[0016] Beneficial effects of the present invention:

[0017] The present invention as a whole has the characteristics of high efficiency, low power consumption and strong stability. The present invention can achieve a stable output voltage within the input voltage range, and the conversion efficiency is maintained at a high level within the full load range, meeting the design requirements of low power consumption and high efficiency. The present invention has a bypass mode. When the input voltage exceeds the set value, the RS trigger outputs a control signal indicating on or off, thereby adjusting the duty cycle and output stability of the Boost power converter and reducing unnecessary energy consumption. The RS trigger of the present invention can receive a fixed time signal generated by the on-time generator module, which is used to set the on-time of the control signal, help achieve a constant on-time, and ensure the accuracy of control and conversion efficiency.

[0018] The present invention realizes adaptive on-time through an on-time generator module, significantly improves the conversion efficiency of a Boost power converter under different load conditions, reduces quiescent current, and thereby prolongs the battery life of a portable electronic device.

[0019] The present invention integrates a zero-crossing detection module during the power conversion process, effectively avoiding damage caused by overload or short circuit, and improving the safety and reliability of the circuit.

[0020] The present invention adopts a bypass mode switching module to perform bypass mode design, so that the Boost power converter can flexibly switch the working mode when the input voltage is higher than the output voltage, and realize the voltage reduction function at the same time; the design optimizes power management and enhances the applicability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0022] Figure 1 is a block diagram of a specific embodiment of the present invention;

[0023] Figure 2 is a circuit diagram of a bandgap reference source module in a specific embodiment of the present invention;

[0024] Figure 3is a circuit diagram of an error amplifier module in a specific embodiment of the present invention;

[0025] Figure 4 is a circuit diagram of a bypass mode switching module in a specific embodiment of the present invention;

[0026] Figure 5 is a circuit diagram of a conduction time generator module in a specific embodiment of the present invention;

[0027] Figure 6 4 is a circuit diagram of a zero-crossing detection module in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] The present invention is further illustrated below in conjunction with specific embodiments. Those skilled in the art should understand that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention, and modifications to various equivalent forms of the present invention fall within the scope defined by the appended claims of this application.

[0030] like Figure 1 As shown, the present invention provides a low-power switching power converter based on a Boost circuit, comprising: a bandgap reference source module, an error amplifier module, an on-time generator module, an RS trigger, a bypass mode switching module and a zero-crossing detection module;

[0031] The output end of the bandgap reference source module is connected to an input end of the error amplifier module, and the bandgap reference source module is used to provide a stable reference voltage signal; the output end of the error amplifier module is connected to the input end of the bypass mode switching module, and the error amplifier module is used to generate a reference voltage signal according to the reference voltage signal V REF and the feedback voltage signal V tGenerate an error signal INP; the output end of the zero-crossing detection module is connected to the input end of the bypass mode switching module, and the zero-crossing detection module is used to collect the inductance and current in the Boost power converter and form a detection signal INN; the output end of the bypass mode switching module is connected to the S port of the RS trigger, and the bypass mode switching module is used to generate a mode control signal RS_S according to the error signal INP and the detection signal INN; the output end of the on-time generator module is connected to the R port of the RS trigger, and the input end of the on-time generator module is connected to the Q non-port of the RS trigger; the on-time generator module is used to intermittently generate a on-signal RS_R of the Boost power converter; the Q port of the RS trigger is respectively connected to the control signal input end of the Boost power converter and the other input end of the error amplifier module, and the RS trigger combines the mode control signal and the on-signal to generate a control signal of the Boost power converter, and the control signal is also used as a feedback voltage signal V for the error amplifier module. t .

[0032] like Figure 2 As shown, the bandgap reference source module includes: resistor R 11 , resistor R 12 , resistor R 13 , Bipolar transistor Q 11 , Bipolar transistor Q 12 、Operational amplifier A 11 ;

[0033] Resistor R 12 One end of each is connected to the operational amplifier A 11 The inverting input terminal and the resistor R 13 One end of the resistor R 13 The other end of the bipolar transistor Q 12 The collector connection of the bipolar transistor Q 12 The base and collector are short-circuited, and the emitter is grounded; the resistor R 11 One end of each is connected to the operational amplifier A 11 The non-inverting input terminal and the bipolar transistor Q 11 The collector connection of the bipolar transistor Q 11 The base and collector are short-circuited, and the emitter is grounded; operational amplifier A 11 The output terminals are connected to the resistor R 12 The other end of the resistor R 11 The other end of the resistor R 13 Connect both ends to external power supply V T InN; Operational amplifier A 11 The output end of the bandgap reference source module outputs the reference voltage V REF .

[0034] like Figure 3 As shown, the error amplifier module includes: NMOS tube M 41 、NMOS tube M 42 、NMOS tube M 43 、NMOS tube M 44 、NMOS tube M 45 And NMOS tube M 46 ;

[0035] NMOS tube M 41 The gate of the error amplifier module is used as an input terminal and connected to the reference voltage V REF ; NMOS tube M 41 The drain of NMOS tube M 43 The gate of NMOS tube M 44 The gate and NMOS tube M 44 The drain connection of NMOS tube M 41 The source of NMOS tube M 42 The source of NMOS tube M 45 The power supply VDD is connected to the drain of NMOS tube M 43 The source of NMOS tube M 44 The source of NMOS tube M 46 The drain connection of NMOS tube M 43 The drain of NMOS tube M 42 The drain of the NMOS tube M is connected as the output end of the error amplifier module to output the error signal INP; 42 The gate of the error amplifier module is used as the other input terminal, and the feedback voltage signal V t ; NMOS tube M 45 The gate of NMOS tube M 46 The gate and NMOS tube M 46 The drain connection of NMOS tube M 45 、NMOS tube M 46 The sources are grounded.

[0036] like Figure 4 As shown, the on-time generator module includes: NMOS tube M 50 、NMOS tube M 51 、NMOS tube M 52 , resistor R C5 , resistor R 51 , resistor R 52 and the operating amplifier AMP; the power supply VDD is respectively connected to the NMOS tube M 51 The source of NMOS tube M 52 Source of NMOS tube M 51The drain of NMOS tube M 51 The gate of NMOS tube M 52 The gate and NMOS tube M 50 The drain source of NMOS tube M 52 The drain of is used as the output end of the conduction time generator module, outputting the conduction signal RS_R; the resistor R 51 One end of the resistor R is used as the input end of the on-time generator module, and is connected to the output signal V0 of the non-end of the RS trigger Q; 51 The other end is connected to the non-inverting input of the operational amplifier AMP and the resistor R 52 One end of the resistor R 52 The other end is grounded; the output end of the operational amplifier AMP is connected to the NMOS tube M 50 The gate of the operational amplifier AMP is connected to the reverse input terminal of the NMOS tube M 50 The source and resistor R C5 One end of the resistor R C5 The other end is grounded.

[0037] like Figure 5 As shown, the bypass mode switching module includes: NMOS tube M 61 、NMOS tube M 62 、NMOS tube M 63 、NMOS tube M 64 、NMOS tube M 65 、NMOS tube M 66 、NMOS tube M 67 、NMOS tube M 68 、NMOS tube M 69 , resistor R 60 、Smit SMIT6、Inverter INV 61 and inverter INV 62 ;

[0038] The error signal INP output from the output end of the error amplifier module is connected to the NMOS tube M 61 The detection signal INN output from the output end of the zero-crossing detection module is connected to the NMOS tube M 62 Gate of NMOS tube M 61 The drain of NMOS tube M 63 The drain connection of NMOS tube M 63 The source of NMOS tube M 64 The source of NMOS tube M 69 The source connection of NMOS tube M 63 The gate of NMOS tube M 64 The gate connection of NMOS tube M 64The drain of NMOS tube M 69 The gate and NMOS tube M 62 The drain connection of NMOS tube M 61 The source of the resistor R 60 One end and NMOS tube M 68 The drain connection of 60 The other end is connected to the NMOS tube M 68 The source of NMOS tube M 66 The drain of NMOS tube M 62 The source connection of NMOS tube M 66 The gate of NMOS tube M 65 The gate of NMOS tube M 65 The drain of NMOS tube M 67 The gate connection of NMOS tube M 66 The source of NMOS tube M 65 The source of NMOS tube M 67 The source connection of NMOS tube M 67 The drain of NMOS tube M 69 The drain of the SMIT6 is connected to the input of the SMIT6; the output of the SMIT6 is connected to the inverter INV 61 The input end and NMOS tube M 68 Gate connection of inverter INV 61 The output terminal of the inverter INV 62 The input terminal of the inverter INV 62 The output end of is used as the output end of the bypass mode switching module to output the mode control signal RS S.

[0039] like Figure 6 As shown, the zero-crossing detection module includes: a resistor R 31 , resistor R 32 、NMOS tube M 31 、NMOS tube M 32 、NMOS tube M 33 、NMOS tube M 34 、Inverter INV 31 、Inverter INV 32 and inverter INV 33 ;

[0040] Preset comparison voltage V sw Access resistor R 31 One end of the resistor R 31 The other end is connected to the NMOS tube M 32 The source connection of NMOS tube M 32 The drain of NMOS tube M34 The drain of the inverter INV 31 The input terminal is connected; the inductor voltage V collected in the Boost power converter L Access resistor R 32 One end of the resistor R 32 The other end is connected to the NMOS tube M 31 The source connection of NMOS tube M 31 The drain of NMOS tube M 31 The gate of NMOS tube M 32 The gate and NMOS tube M 33 The drain connection of NMOS tube M 33 The source of NMOS tube M 34 The source of NMOS tube M is connected and grounded; 34 The gate is biased to V BAIS3 .

[0041] The bandgap reference source module provides a stable reference voltage signal V REF The control signal output from the Q end of the RS trigger is used as the feedback voltage signal V t , are connected to the error amplifier module. The error amplifier module is based on the feedback voltage signal V t With the reference voltage signal V REF The difference between the two forms the error signal INP. The zero-crossing detection module generates an error signal INP according to the sampling voltage signal V of the inductor in the Boost power converter. L Compare with the preset voltage V sw Output detection signal INN. The bypass mode switching module outputs high and low levels according to the relationship between the error signal INP and the detection signal INN. When the error signal INP is greater than the detection signal INN, the bypass mode switching module will output a high level, otherwise it will output a low level. When the bypass mode switching module outputs a high level, the RS trigger S terminal is set, Q outputs a high level, and the Boost power converter exits the bypass mode. At the same time when the RS trigger S terminal is set, the Q non-terminal outputs a low level to the on-time generator module to fix the on-time. After the on-time ends, the on-time generator module sends a pulse signal to the reset terminal R of the RS trigger, the RS trigger is reset, Q outputs a level, and the Boost circuit enters the bypass mode.

[0042] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A low-power switching power converter based on a Boost circuit, characterized in that: include: Bandgap reference source module, error amplifier module, on-time generator module, RS trigger, bypass mode switching module and zero-crossing detection module; The output end of the bandgap reference source module is connected to an input end of the error amplifier module, and the bandgap reference source module is used to provide a stable reference voltage signal; the output end of the error amplifier module is connected to the input end of the bypass mode switching module, and the error amplifier module is used to generate an error signal according to the reference voltage signal and the feedback signal; The output end of the zero-crossing detection module is connected to the input end of the bypass mode switching module, and the zero-crossing detection module is used to collect the inductance and current in the Boost power converter and form a detection signal; the output end of the bypass mode switching module is connected to a signal input end of the RS trigger, and the bypass mode switching module is used to generate a mode control signal according to the error signal and the detection signal; the output end of the on-time generator module is connected to a signal input end of the RS trigger, and the input end of the on-time generator module is connected to another signal output end of the RS trigger; the on-time generator module is used to intermittently generate a turn-on signal for the Boost power converter; the other output end of the RS trigger is respectively connected to the control signal input end of the Boost power converter and the other input end of the error amplifier module, and the RS trigger combines the mode control signal and the turn-on signal to generate a control signal for the Boost power converter, and the control signal is also used as a feedback signal for the error amplifier module.

2. The low-power switching power converter based on the Boost circuit as claimed in claim 1, characterized in that: The bandgap reference source module includes: a resistor R 11 , resistor R 12 , resistor R 13 , Bipolar transistor Q 11 , Bipolar transistor Q 12 、Operational amplifier A 11 ; Resistor R 12 One end of each is connected to the operational amplifier A 11 The inverting input terminal and the resistor R 13 One end of the resistor R 13 The other end of the bipolar transistor Q 12 The collector connection of the bipolar transistor Q 12 The base and collector are short-circuited, and the emitter is grounded; the resistor R 11 One end of each is connected to the operational amplifier A 11 The non-inverting input terminal and the bipolar transistor Q 11 The collector connection of the bipolar transistor Q 11 The base and collector are short-circuited, and the emitter is grounded; operational amplifier A 11 The output terminals are connected to the resistor R 12 The other end of the resistor R11 and the ground are connected; the resistor R 13 Both ends are connected to external power supply; operational amplifier A 11 The output end of is used as the output end of the bandgap reference source module.

3. The low-power switching power converter based on the Boost circuit as claimed in claim 1, characterized in that: The error amplifier module includes: NMOS tube M 41 、NMOS tube M 42 、NMOS tube M 43 、NMOS tube M 44 、NMOS tube M 45 And NMOS tube M 46 ; NMOS tube M 41 The gate of the NMOS tube M is used as an input terminal of the error amplifier module; 41 The drain of NMOS tube M 43 The gate of NMOS tube M 44 The gate and NMOS tube M 44 The drain connection of NMOS tube M 41 The source of NMOS tube M 42 The source of NMOS tube M 45 The power supply VDD is connected to the drain of NMOS tube M 43 The source of NMOS tube M 44 The source of NMOS tube M 46 The drain connection of NMOS tube M 43 The drain of NMOS tube M 42 The drain of the NMOS tube M is connected as the output end of the error amplifier module; 42 The gate of the NMOS tube M is used as the other input terminal of the error amplifier module; 45 The gate of NMOS tube M 46 The gate and NMOS tube M 46 The drain connection of NMOS tube M 45 、NMOS tube M 46 The sources are grounded.

4. The low-power switching power converter based on the Boost circuit as claimed in claim 1, characterized in that: The conduction time generator module includes: NMOS tube M 50 、NMOS tube M 51 、NMOS tube M 52 , resistor R C5 , resistor R 51 , resistor R 52 and the operating amplifier AMP; the power supply VDD is respectively connected to the NMOS tube M 51 The source of NMOS tube M 52 Source of NMOS tube M 51 The drain of NMOS tube M 51 The gate of NMOS tube M 52 The gate and NMOS tube M 50 The drain source of NMOS tube M 52 The drain of is used as the output terminal of the on-time generator module; the resistor R 51 One end of the resistor R 51 The other end is connected to the non-inverting input of the operational amplifier AMP and the resistor R 52 One end of the resistor R 52 The other end is grounded; the output end of the operational amplifier AMP is connected to the NMOS tube M 50 The gate of the operational amplifier AMP is connected to the reverse input terminal of the NMOS tube M 50 The source and resistor R C5 One end of the resistor R C5 The other end is grounded.

5. The low-power switching power converter based on Boost circuit as claimed in claim 1, characterized in that: The bypass mode switching module includes: an NMOS tube M 61 、NMOS tube M 62 、NMOS tube M 63 、NMOS tube M 64 、NMOS tube M 65 、NMOS tube M 66 、NMOS tube M 67 、NMOS tube M 68 、NMOS tube M 69 , resistor R 60 、Smit SMIT6、Inverter INV 61 and inverter INV 62 ; The output of the error amplifier module is connected to the NMOS tube M 61 The output end of the zero-crossing detection module is connected to the gate of the NMOS tube M 62 The gate connection of NMOS tube M 61 The drain of NMOS tube M 63 The drain connection of NMOS tube M 63 The source of NMOS tube M 64 The source of NMOS tube M 69 The source connection of NMOS tube M 63 The gate of NMOS tube M 64 The gate connection of NMOS tube M 64 The drain of NMOS tube M 69 The gate and NMOS tube M 62 The drain connection of NMOS tube M 61 The source of the resistor R 60 One end and NMOS tube M 68 The drain connection of the resistor R 60 The other end is connected to the NMOS tube M 68 The source of NMOS tube M 66 The drain of NMOS tube M 62 The source connection of NMOS tube M 66 The gate of NMOS tube M 65 The gate of NMOS tube M 65 The drain of NMOS tube M 67 The gate connection of NMOS tube M 66 The source of NMOS tube M 65 The source of NMOS tube M 67 The source connection of NMOS tube M 67 The drain of NMOS tube M 69 The drain of the SMIT6 is connected to the input of the SMIT6; the output of the SMIT6 is connected to the inverter INV 61 The input end and NMOS tube M 68 Gate connection of inverter INV 61 The output terminal of the inverter INV 62 The input terminal of the inverter INV 62 The output end of is used as the output end of the bypass mode switching module.

6. The low-power switching power converter based on the Boost circuit as claimed in any one of claims 1 to 5, characterized in that: The zero-crossing detection module includes: a resistor R 31 , resistor R 32 、NMOS tube M 31 、NMOS tube M 32 、NMOS tube M 33 、NMOS tube M 34 、Inverter INV 31 、Inverter INV 32 and inverter INV 33 ; The preset comparison voltage is connected to the resistor R 31 One end of the resistor R 31 The other end is connected to the NMOS tube M 32 The source connection of NMOS tube M 32 The drain of NMOS tube M 34 The drain of the inverter INV 31 The input terminal is connected; the collected voltage of the inductor in the Boost power converter is connected to the resistor R 32 One end of the resistor R 32 The other end is connected to the NMOS tube M 31 The source connection of NMOS tube M 31 The drain of NMOS tube M 31 The gate of NMOS tube M 32 The gate and NMOS tube M 33 The drain connection of NMOS tube M 33 The source of NMOS tube M 34 The source of NMOS tube M is connected and grounded; 34 The gate is biased.

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