Hot standby redundant power supply circuit and system

Abstract

The utility model discloses a hot standby redundant power supply circuit and system, relates to the field of power supply, the circuit is provided with a control module, a first MOS tube and a second MOS tube, when a main power supply is normal, the first MOS tube is conducted, at the moment, the main power supply supplies power to a power supply port, when the main power supply is abnormal, the second MOS tube is conducted, at the moment, if a standby power supply is normal, the standby power supply supplies power to the power supply port. According to the scheme, redundant power supply of the main power supply and the standby power supply can be achieved only by arranging the two MOS tubes and the control module, and due to the fact that the voltage drop of the MOS tubes is small, the scheme is suitable for a circuit with the high requirement for power supply precision.

Description

Technical Field

[0001] The utility model relates to the field of power supply, and particularly relates to a hot standby redundant power supply circuit and system. Background Art

[0002] In some circuit designs with high reliability requirements, dual power supply redundant power supply is usually adopted, that is, one power supply is the main power supply, and the other power supply is the standby power supply, and it is ensured that when the main power supply fails (power off or voltage drops to the threshold value), it can be switched to the standby power supply in time to supply power to the electrical equipment.

[0003] In the prior art, the most commonly used redundant power supply method is to adopt a diode combined power supply scheme, but due to the large voltage drop of the diode, this scheme is not applicable to circuits with high requirements for power supply accuracy. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a hot standby redundant power supply circuit and system. This scheme can achieve redundant power supply of the main power supply and the standby power supply only by setting two MOS transistors and a control module. And because the voltage drop of the MOS transistor is small, this scheme is applicable to circuits with high requirements for power supply accuracy.

[0005] To solve the above technical problems, the utility model provides a hot standby redundant power supply circuit, including: a control module, a first MOS transistor and a second MOS transistor;

[0006] The first input end of the control module is connected to the main power supply, the second input end is connected to the standby power supply, and the output end is respectively connected to the gate of the first MOS transistor and the gate of the second MOS transistor, and is used to control the first MOS transistor to conduct when the main power supply is normal, and control the second MOS transistor to conduct when the main power supply is abnormal;

[0007] The source of the first MOS transistor is connected to the power supply port, and the drain is connected to the main power supply;

[0008] The source of the second MOS transistor is connected to the power supply port, and the drain is connected to the standby power supply.

[0009] Optionally, the first MOS transistor is a first P-type MOS transistor, the gate of the first MOS transistor is the gate of the first P-type MOS transistor, the source of the first MOS transistor is the source of the first P-type MOS transistor, and the drain of the first MOS transistor is the drain of the first P-type MOS transistor; the second MOS transistor is a second P-type MOS transistor, the gate of the second MOS transistor is the gate of the second P-type MOS transistor, the source of the second MOS transistor is the source of the second P-type MOS transistor, and the drain of the second MOS transistor is the drain of the second P-type MOS transistor;

[0010] Correspondingly, the control module includes: a switch control module, a third P-type MOS transistor, and a first resistor;

[0011] A first input terminal of the switch control module is connected to the main power supply, a second input terminal is connected to the backup power supply, and an output terminal is respectively connected to the gates of the first P-type MOS transistor and the third P-type MOS transistor, and is configured to control the first P-type MOS transistor and the third P-type MOS transistor to conduct when the main power supply is normal, and control the second P-type MOS transistor to conduct when the main power supply is abnormal;

[0012] A source electrode of the third P-type MOS transistor is connected to the power supply port, and a drain electrode is respectively connected to the gate of the second P-type MOS transistor and a first end of the first resistor;

[0013] A second end of the first resistor is grounded.

[0014] Optionally, the switch control module includes: a first voltage dividing module, a second voltage dividing module, a comparator, and a second resistor;

[0015] A positive-phase input terminal of the comparator is connected to the first voltage dividing module, a negative-phase input terminal is connected to the second voltage dividing module, and an output terminal is connected to the first voltage dividing module, and is configured to output a high-impedance level when the voltage at the positive-phase input terminal is greater than the voltage at the negative-phase input terminal, and output a first level when the voltage at the positive-phase input terminal is less than the voltage at the negative-phase input terminal;

[0016] The first voltage dividing module is respectively connected to the backup power supply and the ground wire;

[0017] The second voltage dividing module is respectively connected to the main power supply and the ground wire;

[0018] A first end of the second resistor is connected to the power supply port, and a second end is respectively connected to the output terminal of the comparator, the gate of the first P-type MOS transistor, and the gate of the third P-type MOS transistor, and is configured to convert the high-impedance level into a corresponding second level when the power supply port is powered on, and the first level is less than the second level.

[0019] Optionally, the first voltage dividing module includes: a third resistor, a fourth resistor, and a fifth resistor;

[0020] A first end of the third resistor is connected to the backup power supply, and a second end is respectively connected to the positive-phase input terminal of the comparator and a first end of the fourth resistor;

[0021] A second end of the fourth resistor is connected to the ground;

[0022] The first end of the fifth resistor is connected to the output end of the comparator, and the second end is connected to the positive-phase input end of the comparator.

[0023] Optionally, the second voltage division module includes: a sixth resistor and a seventh resistor;

[0024] The first end of the sixth resistor is connected to the backup power supply, and the second end is respectively connected to the negative-phase input end of the comparator and the first end of the seventh resistor;

[0025] The second end of the seventh resistor is connected to the ground.

[0026] Optionally, the switch control module further includes:

[0027] A charging capacitor, the first end of the charging capacitor is respectively connected to the second end of the third resistor, the first end of the fourth resistor, the second end of the fifth resistor, and the positive-phase input end of the comparator, and the second end is connected to the ground.

[0028] Optionally, the switch control module further includes:

[0029] A voltage-limiting resistor, the first end of the voltage-limiting resistor is respectively connected to the second end of the third resistor, the first end of the fourth resistor, the second end of the fifth resistor, and the positive-phase input end of the comparator, and the second end is connected to the ground.

[0030] Optionally, it further includes:

[0031] A filtering module, the first end of the filtering module is connected to the output end of the comparator, and the second end is respectively connected to the second end of the second resistor, the gate of the first P-type MOS transistor, and the gate of the third P-type MOS transistor.

[0032] Optionally, the filtering module is a filtering capacitor, the first end of the filtering capacitor is connected to the output end of the comparator, and the second end is respectively connected to the second end of the second resistor, the gate of the first P-type MOS transistor, and the gate of the third P-type MOS transistor.

[0033] To solve the above technical problems, the present invention also provides a hot standby redundant power supply system, including: a main power supply, a backup power supply, and the hot standby redundant power supply circuit as described above, and the hot standby redundant power supply circuit is respectively connected to the main power supply and the backup power supply.

[0034] The purpose of the present utility model is to provide a hot standby redundant power supply circuit and system. A control module, a first MOS transistor and a second MOS transistor are arranged in the circuit. When the main power supply is normal, the first MOS transistor is turned on. At this time, the main power supply supplies power to the power supply port. When the main power supply is abnormal, the second MOS transistor is turned on. At this time, if the standby power supply is normal, the standby power supply will supply power to the power supply port. This solution can achieve redundant power supply of the main power supply and the standby power supply only by setting two MOS transistors and a control module. And because the voltage drop of the MOS transistor is small, this solution is applicable to circuits with high requirements for power supply accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0036] Figure 1 FIG. is a schematic structural diagram of a hot standby redundant power supply circuit provided by the present invention;

[0037] Figure 2 FIG. is a schematic structural diagram of another hot standby redundant power supply circuit provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The core of the present utility model is to provide a hot standby redundant power supply circuit and system. This solution can achieve redundant power supply of the main power supply and the standby power supply only by setting two MOS transistors and a control module. And because the voltage drop of the MOS transistor is small, this solution is applicable to circuits with high requirements for power supply accuracy.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0040] Please refer to Figure 1 , Figure 1 FIG. is a schematic structural diagram of a hot standby redundant power supply circuit provided by the present invention. The hot standby redundant power supply circuit includes: a control module 1, a first MOS transistor 2, and a second MOS transistor 3;

[0041] The first input terminal of the control module 1 is connected to the main power supply, the second input terminal is connected to the backup power supply, and the output terminal is respectively connected to the gate of the first MOS transistor 2 and the gate of the second MOS transistor 3, and is used to control the first MOS transistor 2 to conduct when the main power supply is normal, and control the second MOS transistor 3 to conduct when the main power supply is abnormal;

[0042] The source electrode of the first MOS transistor 2 is connected to the power supply port, and the drain electrode is connected to the main power supply;

[0043] The source electrode of the second MOS transistor 3 is connected to the power supply port, and the drain electrode is connected to the backup power supply.

[0044] In the present invention, in order to achieve redundant power supply of the main power supply and the backup power supply, the control module 1, the first MOS transistor 2 and the second MOS transistor 3 are provided. When the main power supply is normal, the control module 1 will control the first MOS transistor 2 to conduct, and because the source electrode and the drain electrode of the first MOS transistor 2 are respectively connected to the power supply port and the main power supply, when the first MOS transistor 2 conducts, the main power supply can supply power to the power supply port; on the contrary, when the main power supply is abnormal, the control module 1 will control the second MOS transistor 3 to conduct, and because the source electrode and the drain electrode of the second MOS transistor 3 are respectively connected to the power supply port and the backup power supply, when the second MOS transistor 3 conducts, the backup power supply can supply power to the power supply port, that is, the redundant power supply method of supplying power by the main power supply when the main power supply is normal and supplying power by the backup power supply when the main power supply is abnormal is successfully realized. Moreover, only two MOS transistors and a control module are set in this solution to realize the redundant power supply of the main power supply and the backup power supply, and because the voltage drop of the MOS transistor is small and the power efficiency is improved, this solution is applicable to circuits with high requirements for power accuracy.

[0045] It should be noted that the hot standby redundant power supply circuit provided in this application uses a small number of electronic devices, and is only composed of resistors, capacitors, MOS (Metal Oxide Semiconductor) transistors and a comparator N1A, with low cost and high reliability, improving the economy of the system.

[0046] It should also be noted that as Figure 2 shown, VM is the main power supply and VB is the backup power supply.

[0047] 1. When the main and backup power supplies are powered on at the same time, the voltage at the positive input terminal of the comparator N1A slowly rises through the third resistor R3 to charge the charging capacitor C, and there is no capacitor charging at the negative input terminal of the comparator N1A, so that the voltage at the negative input terminal of the comparator N1A is higher than the voltage at the positive input terminal. At this time, the output terminal of the comparator N1A outputs a low level, and the VGS voltage of the first P-type MOS transistor P1 is higher than the opening voltage threshold, so the first P-type MOS transistor P1 conducts, and the main power supply VM supplies power normally; similarly, the third P-type MOS transistor P3 conducts, and the second P-type MOS transistor P2 is disconnected, and the backup power supply VB does not supply power.

[0048] At this time, since there is no need to introduce the second resistor R2, the reference voltage at the non-inverting input terminal of the comparator N1A is: ;

[0049] Assume R3 = R4 = 10k, R5 = 120k, and VB = 5V.

[0050] Then the reference voltage ;

[0051] Meanwhile, assume R6 = R7 = 10k. When VM is less than 4.8V, the voltage at the inverting input terminal of the comparator N1A is lower than the reference voltage at the non-inverting input terminal. The output terminal of the comparator N1A outputs a high-impedance state. At this time, it is necessary to pull up the high-impedance state level to a high level through the second resistor R2, so that the first P-type MOS transistor P1 is turned off, the main power supply VM is cut off; the third P-type MOS transistor P3 is turned off, and the second P-type MOS transistor P2 is turned on, and the backup power supply VB starts to supply power.

[0052] When ignoring the voltage drop of the MOS transistor and the VCC power supply is close to VB, at this time, since the second resistor R2 needs to be introduced, the reference voltage at the non-inverting input terminal of the comparator N1A is:

[0053] ; Assume R2 = 1k, then the reference voltage ;

[0054] Therefore, when the main power supply VM resumes above 5.2V, the system switches to the main power supply for power supply, and the backup power supply does not supply power. In the actual circuit, the resistance value of the fifth resistor R5 can be adjusted to change the threshold of the switching voltage; the capacitance value of the charging capacitor C can be adjusted to ensure that when the main power supply and the backup power supply are powered on simultaneously within a certain period of time, the main power supply is preferentially used for power supply.

[0055] 2. When only the main power supply VM supplies power and the output terminal of the comparator N1A outputs a low level, the first P-type MOS transistor P1 is turned on, the third P-type MOS transistor P3 is turned on, the second P-type MOS transistor P2 is turned off, and the main power supply VM supplies power normally;

[0056] 3. When only the backup power supply VB supplies power and the output terminal of the comparator N1A outputs a high-impedance state level, the first P-type MOS transistor P1 is turned off, the third P-type MOS transistor P3 is turned off, the second P-type MOS transistor P2 is turned on, and the backup power supply VB supplies power normally.

[0057] This embodiment provides a hot standby redundant power supply circuit. A control module 1, a first MOS transistor 2, and a second MOS transistor 3 are provided in the circuit. When the main power supply is normal, the first MOS transistor 2 is turned on. At this time, the main power supply supplies power to the power supply port. When the main power supply is abnormal, the second MOS transistor 3 is turned on. At this time, if the backup power supply is normal, the backup power supply will supply power to the power supply port. This solution can achieve redundant power supply of the main power supply and the backup power supply only by setting two MOS transistors and a control module. And because the voltage drop of the MOS transistor is small, this solution is applicable to circuits with high requirements for power supply accuracy.

[0058] Based on the above embodiment:

[0059] As an optional embodiment, the first MOS transistor 2 is a first P-type MOS transistor P1. The gate of the first MOS transistor 2 is the gate of the first P-type MOS transistor P1. The source of the first MOS transistor 2 is the source of the first P-type MOS transistor P1. The drain of the first MOS transistor 2 is the drain of the first P-type MOS transistor P1. The second MOS transistor 3 is a second P-type MOS transistor P2. The gate of the second MOS transistor 3 is the gate of the second P-type MOS transistor P2. The source of the second MOS transistor 3 is the source of the second P-type MOS transistor P2. The drain of the second MOS transistor 3 is the drain of the second P-type MOS transistor P2.

[0060] Correspondingly, the control module 1 includes: a switch control module 1, a third P-type MOS transistor P3, and a first resistor R1.

[0061] The first input end of the switch control module 1 is connected to the main power supply, the second input end is connected to the backup power supply, and the output end is respectively connected to the gate of the first P-type MOS transistor P1 and the gate of the third P-type MOS transistor P3, and is used to control the first P-type MOS transistor P1 and the third P-type MOS transistor P3 to be turned on when the main power supply is normal, and control the second P-type MOS transistor P2 to be turned on when the main power supply is abnormal.

[0062] The source of the third P-type MOS transistor P3 is connected to the power supply port, and the drain is respectively connected to the gate of the second P-type MOS transistor P2 and the first end of the first resistor R1.

[0063] The second end of the first resistor R1 is grounded.

[0064] In the present invention, a switch control module 1, a third P-type MOS transistor P3 and a first resistor R1 are provided in the control module 1. When the main power supply is normal, the switch control module 1 controls the first P-type MOS transistor P1 and the third P-type MOS transistor P3 to conduct. Since the third P-type MOS transistor P3 conducts, the second P-type MOS transistor P2 is turned off at this time. Therefore, only the main power supply supplies power to the power supply port at this time. On the contrary, if the main power supply is abnormal, the switch control module 1 controls the second P-type MOS transistor P2 to conduct. Therefore, only the backup power supply supplies power to the power supply port at this time, ensuring the integrity and accuracy of the redundant power supply process.

[0065] As an optional embodiment, the switch control module 1 includes: a first voltage dividing module, a second voltage dividing module, a comparator N1A and a second resistor R2;

[0066] The positive input terminal of the comparator N1A is connected to the first voltage dividing module, the negative input terminal is connected to the second voltage dividing module, and the output terminal is connected to the first voltage dividing module, and is used to output a high-impedance state level when the voltage at the positive input terminal is greater than the voltage at the negative input terminal, and output a first level when the voltage at the positive input terminal is less than the voltage at the negative input terminal;

[0067] The first voltage dividing module is respectively connected to the backup power supply and the ground wire;

[0068] The second voltage dividing module is respectively connected to the main power supply and the ground wire;

[0069] The first end of the second resistor R2 is connected to the power supply port, and the second end is respectively connected to the output terminal of the comparator N1A, the gate of the first P-type MOS transistor P1 and the gate of the third P-type MOS transistor P3, and is used to convert the high-impedance state level into a corresponding second level when the power supply port is powered on, and the first level is less than the second level.

[0070] In the present invention, a first voltage dividing module, a second voltage dividing module, a comparator N1A, and a second resistor R2 are provided in the switch control module 1. Among them, since the positive input terminal of the comparator N1A is connected to the standby power supply through the first voltage dividing module, and the negative input terminal of the comparator N1A is connected to the main power supply through the second voltage dividing module, and since the comparator N1A has an open-drain output, the output of the comparator N1A is in a high-impedance state or a low level. When the voltage at the positive input terminal of the comparator N1A is greater than the voltage at the negative input terminal, the output is in a high-impedance state. At this time, a pull-up resistor (the second resistor R2) is required to pull it up to a high level (the second level) so as to subsequently control the first P-type MOS transistor P1 and the third P-type MOS transistor P3 to turn off, so that the second P-type MOS transistor P2 is turned on. At this time, only the standby power supply supplies power to the power supply port; conversely, when the voltage at the positive input terminal of the comparator N1A is less than the voltage at the negative input terminal, the output is a low level (the first level). At this time, the first P-type MOS transistor P1 and the third P-type MOS transistor P3 are turned on, and the second P-type MOS transistor P2 is turned off. At this time, only the main power supply supplies power to the power supply port, ensuring the accuracy of the redundant power supply process.

[0071] As an optional embodiment, the first voltage dividing module includes: a third resistor R3, a fourth resistor R4, and a fifth resistor R5;

[0072] The first end of the third resistor R3 is connected to the standby power supply, and the second end is respectively connected to the positive input terminal of the comparator N1A and the first end of the fourth resistor R4;

[0073] The second end of the fourth resistor R4 is connected to the ground;

[0074] The first end of the fifth resistor R5 is connected to the output terminal of the comparator N1A, and the second end is connected to the positive input terminal of the comparator N1A.

[0075] In the present invention, a third resistor R3, a fourth resistor R4, and a fifth resistor R5 are provided in the first voltage dividing module. Among them, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 divide the voltage transmitted by the standby power supply and accurately transmit the divided voltage to the positive input terminal of the comparator N1A.

[0076] As an optional embodiment, the second voltage dividing module includes: a sixth resistor R6 and a seventh resistor R7;

[0077] The first end of the sixth resistor R6 is connected to the standby power supply, and the second end is respectively connected to the negative input terminal of the comparator N1A and the first end of the seventh resistor R7;

[0078] The second end of the seventh resistor R7 is connected to the ground.

[0079] In the present invention, a sixth resistor R6 and a seventh resistor R7 are provided in the first voltage dividing module. The sixth resistor R6 and the seventh resistor R7 divide the voltage transmitted by the main power supply and accurately transmit the divided voltage to the negative input terminal of the comparator N1A.

[0080] As an alternative embodiment, the switch control module 1 further includes:

[0081] A charging capacitor C. The first end of the charging capacitor C is respectively connected to the second end of the third resistor R3, the first end of the fourth resistor R4, the second end of the fifth resistor R5, and the positive input terminal of the comparator N1A, and the second end is connected to the ground.

[0082] In the present invention, the switch control module 1 is further provided with a charging capacitor C. When the backup power supply is normally powered on, the charging capacitor C absorbs the electrical energy transmitted by the backup power supply for charging. When the main power supply and the backup power supply are powered on simultaneously, if the voltages transmitted by the main power supply and the backup power supply are equal, and the voltage dividing functions of the first voltage dividing module and the second voltage dividing module are the same, but because the charging capacitor C needs to be charged, the voltage at the negative input terminal of the comparator N1A will be greater than the voltage at the positive input terminal of the comparator N1A within a certain period of time. At this time, the comparator N1A outputs a low level, ensuring that when the main power supply and the backup power supply are powered on simultaneously, the main power supply is preferentially used for power supply.

[0083] As an alternative embodiment, the switch control module 1 further includes:

[0084] A voltage limiting resistor. The first end of the voltage limiting resistor is respectively connected to the second end of the third resistor R3, the first end of the fourth resistor R4, the second end of the fifth resistor R5, and the positive input terminal of the comparator N1A, and the second end is connected to the ground.

[0085] In the present invention, a voltage limiting resistor is further provided in the switch control module 1. The voltage limiting resistor plays a role in limiting the loop voltage, preventing the voltage in the loop from being too large and causing danger, and improving the safety of the solution.

[0086] As an alternative embodiment, it further includes:

[0087] A filtering module. The first end of the filtering module is connected to the output terminal of the comparator N1A, and the second end is respectively connected to the second end of the second resistor R2, the gate of the first P-type MOS transistor P1, and the gate of the third P-type MOS transistor P3.

[0088] In the present invention, a filtering module is further provided in the switch control module 1. The filtering module is arranged between the input terminal of the comparator N1A and the gates of the first P-type MOS transistor P1 and the third P-type MOS transistor P3, and can perform corresponding filtering on the first level output by the comparator N1A and the second level pulled up by the second resistor R2, improving the control efficiency.

[0089] It should be noted that in practical applications, the filtering module can be a capacitor, an inductor, an RC (Resistance Capacitor) filtering circuit, an RL (Resistance Inductor) filtering circuit, an LC (Inductor Capacitor) filtering circuit, or other filtering devices.

[0090] As an alternative embodiment, the filtering module is a filtering capacitor. The first end of the filtering capacitor is connected to the output end of the comparator N1A, and the second end is respectively connected to the second end of the second resistor R2, the gate of the first P-type MOS transistor P1, and the gate of the third P-type MOS transistor P3.

[0091] In the present invention, since the capacitor has the advantages of extremely small leakage current, good storage performance, long service life, small capacitance error, small volume, large capacitance, good high-frequency characteristics, good frequency stability, small loss, high precision, resistance to high voltage and large current impact, excellent electrical performance, high reliability, and self-healing performance, the filtering capacitor is adopted as the filtering module in this solution.

[0092] The present utility model also provides an embodiment corresponding to the hot standby redundant power supply system, including: a main power supply, a standby power supply, and the hot standby redundant power supply circuit as described above. The hot standby redundant power supply circuit is respectively connected to the main power supply and the standby power supply.

[0093] The hot standby redundant power supply system provided in this embodiment corresponds to the above-mentioned hot standby redundant power supply circuit, so it has the same beneficial effects as the above-mentioned hot standby redundant power supply circuit. Therefore, for the description of the embodiments of the hot standby redundant power supply system part, please refer to the description of the embodiments of the hot standby redundant power supply circuit part, which will not be elaborated here for the time being.

[0094] It should be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0095] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hot standby redundant power supply circuit, characterized in that, Including: A control module, a first MOS transistor, and a second MOS transistor; A first input end of the control module is connected to a main power supply, a second input end is connected to a backup power supply, and an output end is respectively connected to a gate of the first MOS transistor and a gate of the second MOS transistor, and is configured to control the first MOS transistor to conduct when the main power supply is normal, and control the second MOS transistor to conduct when the main power supply is abnormal; A source of the first MOS transistor is connected to a power supply port, and a drain is connected to the main power supply; A source of the second MOS transistor is connected to the power supply port, and a drain is connected to the backup power supply.

2. The hot standby redundant power supply circuit according to claim 1, characterized in that The first MOS transistor is a first P-type MOS transistor, a gate of the first MOS transistor is a gate of the first P-type MOS transistor, a source of the first MOS transistor is a source of the first P-type MOS transistor, and a drain of the first MOS transistor is a drain of the first P-type MOS transistor; the second MOS transistor is a second P-type MOS transistor, a gate of the second MOS transistor is a gate of the second P-type MOS transistor, a source of the second MOS transistor is a source of the second P-type MOS transistor, and a drain of the second MOS transistor is a drain of the second P-type MOS transistor; Correspondingly, the control module includes: a switch control module, a third P-type MOS transistor, and a first resistor; A first input end of the switch control module is connected to the main power supply, a second input end is connected to the backup power supply, and an output end is respectively connected to a gate of the first P-type MOS transistor and a gate of the third P-type MOS transistor, and is configured to control the first P-type MOS transistor and the third P-type MOS transistor to conduct when the main power supply is normal, and control the second P-type MOS transistor to conduct when the main power supply is abnormal; A source of the third P-type MOS transistor is connected to the power supply port, and a drain is respectively connected to a gate of the second P-type MOS transistor and a first end of the first resistor; A second end of the first resistor is grounded.

3. The hot standby redundant power supply circuit according to claim 2, wherein, The switch control module includes: a first voltage dividing module, a second voltage dividing module, a comparator, and a second resistor; A positive-phase input end of the comparator is connected to the first voltage dividing module, a negative-phase input end is connected to the second voltage dividing module, and an output end is connected to the first voltage dividing module, and is configured to output a high-impedance level when a voltage at the positive-phase input end is greater than a voltage at the negative-phase input end, and output a first level when the voltage at the positive-phase input end is less than the voltage at the negative-phase input end; The first voltage dividing module is respectively connected to the backup power supply and a ground wire; The second voltage dividing module is respectively connected to the main power supply and a ground wire; A first end of the second resistor is connected to the power supply port, and a second end is respectively connected to an output end of the comparator, a gate of the first P-type MOS transistor, and a gate of the third P-type MOS transistor, and is configured to convert the high-impedance level into a corresponding second level when the power supply port is powered on, and the first level is less than the second level.

4. The hot standby redundant power supply circuit according to claim 3, wherein The first voltage dividing module includes: a third resistor, a fourth resistor, and a fifth resistor; The first end of the third resistor is connected to the standby power supply, and the second end is respectively connected to the positive-phase input terminal of the comparator and the first end of the fourth resistor; The second end of the fourth resistor is connected to the ground; The first end of the fifth resistor is connected to the output terminal of the comparator, and the second end is connected to the positive-phase input terminal of the comparator.

5. The hot standby redundant power supply circuit according to claim 3, wherein The second voltage dividing module includes: a sixth resistor and a seventh resistor; The first end of the sixth resistor is connected to the standby power supply, and the second end is respectively connected to the negative-phase input terminal of the comparator and the first end of the seventh resistor; The second end of the seventh resistor is connected to the ground.

6. The hot standby redundant power supply circuit according to claim 4, wherein The switch control module further includes: A charging capacitor, the first end of the charging capacitor is respectively connected to the second end of the third resistor, the first end of the fourth resistor, the second end of the fifth resistor and the positive-phase input terminal of the comparator, and the second end is connected to the ground.

7. The hot standby redundant power supply circuit according to claim 4, wherein The switch control module further includes: A voltage limiting resistor, the first end of the voltage limiting resistor is respectively connected to the second end of the third resistor, the first end of the fourth resistor, the second end of the fifth resistor and the positive-phase input terminal of the comparator, and the second end is connected to the ground.

8. The hot standby redundant power supply circuit according to any one of claims 3 to 7, characterized in that, It further includes: A filtering module, the first end of the filtering module is connected to the output terminal of the comparator, and the second end is respectively connected to the second end of the second resistor, the gate of the first P-type MOS transistor and the gate of the third P-type MOS transistor.

9. The hot standby redundant power supply circuit according to claim 8, wherein, The filtering module is a filtering capacitor, the first end of the filtering capacitor is connected to the output terminal of the comparator, and the second end is respectively connected to the second end of the second resistor, the gate of the first P-type MOS transistor and the gate of the third P-type MOS transistor.

10. A hot standby redundant power supply system, characterized in that, It includes: A main power supply, a standby power supply and the hot standby redundant power supply circuit according to any one of claims 1 to 9, and the hot standby redundant power supply circuit is respectively connected to the main power supply and the standby power supply.

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