Redundant power supply circuit and redundant power supply device

Abstract

The present invention proposes a redundant power supply circuit and redundant power supply device, wherein the redundant power supply circuit includes a main power module, a backup power module, a switch switching module and a voltage stabilizing module. When the main power module is operating normally, the switch switching module switches to the first channel, and the main power module outputs normally to the external load. When the main power module is abnormal, the switch switching module can automatically identify the circuit abnormality and quickly switch to the backup power module for power supply without the need for software control. Before and after the switching, only one power module provides excitation to the external load, ensuring the quality of the power output while increasing the service life of the power supply. At the same time, when the voltage of the main power module changes, or the output voltage of the switched backup power module changes or surges, the feedback module generates a feedback control signal based on the output working voltage and the power supply voltage provided by the backup power module, so that the voltage stabilizing module performs voltage stabilization adjustment to ensure the output voltage is stable, thereby ensuring the normal operation of the external load.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply, and in particular relates to a redundant power supply circuit and a redundant power supply device. Background Art

[0002] With the development of power electronics technology, various electronic devices and equipment have increasingly stringent requirements for power supply stability. To improve the stability and reliability of equipment and system operation, some devices and systems that require long-term, uninterrupted operation and high reliability, such as base station communication equipment, monitoring equipment, and servers, often require a highly reliable power supply. The design of redundant power supplies is a key component and plays an important role in high-reliability systems.

[0003] Traditional parallel redundant backup involves connecting two or more power modules via diode anodes. These are then connected in parallel using an OR gate to a power bus, allowing each module to simultaneously supply power to the device. The drawback of this solution is that the actual parameters of the multiple power modules vary, and simultaneous output can increase ripple and noise in downstream circuits. Furthermore, because multiple power modules have the same output function, the lifespan of the redundant power modules is shortened. Furthermore, a short circuit at the load side affects all power modules.

[0004] Another type of power supply redundancy involves multiple power modules with the same functionality. One module provides power during normal operation, and when it fails, the backup module takes over. However, this approach suffers from a time lag between power switching, during which the operating voltage drops and then rises again. This can easily cause voltage gaps, potentially causing a momentary power loss in the downstream control chip, causing the external load to reboot. Furthermore, these redundancy solutions can generate voltage fluctuations of varying magnitudes during the primary / backup power switching process, or surges at the moment of switching, affecting external load performance. Summary of the Invention

[0005] The present invention aims to provide a redundant power supply circuit, aiming to solve the problems of switching time interval, unequal output voltage and surge generation in traditional parallel redundant power supplies.

[0006] A first aspect of an embodiment of the present invention provides a redundant power supply circuit, including:

[0007] Main power module;

[0008] Backup power module;

[0009] a switch switching module, a first input end of which is connected to the output end of the main power module, and a second input end of which is connected to the output end of the backup power module, for controlling the main power module to supply power when the voltage at the first input end of the switch switching module is greater than a first preset voltage, and controlling the backup power module to supply power when the voltage at the first input end of the switch switching module is less than or equal to the first preset voltage;

[0010] a voltage stabilizing module, wherein a first input terminal of the voltage stabilizing module is connected to the output terminal of the switching module, and a second input terminal of the voltage stabilizing module is connected to the output terminal of the feedback module, and the voltage stabilizing module generates an operating voltage by regulating the received power supply voltage in response to the feedback control signal, and outputs the operating voltage;

[0011] The feedback module has a first input end connected to the output end of the voltage stabilizing module and a second input end connected to the output end of the backup power supply module, and is used to generate the feedback control signal based on the operating voltage output by the voltage stabilizing module and the power supply voltage provided by the backup power supply module.

[0012] In one embodiment, the feedback module includes:

[0013] A reference voltage generating unit, whose input end is connected to the output end of the backup power supply module, is used to generate a reference voltage and output it;

[0014] A feedback voltage generating unit, whose input end is connected to the output end of the voltage stabilizing module, is used to generate and output a feedback voltage;

[0015] A comparison amplification unit, whose first input end is connected to the output end of the reference voltage generating unit, whose second input end is connected to the output end of the feedback voltage generating unit, and whose output end is connected to the second input end of the voltage stabilization module, is used to receive the reference voltage and the feedback voltage, calculate the difference between the reference voltage and the feedback voltage, and amplify the difference to generate the feedback control signal and provide it to the voltage stabilization module.

[0016] In one embodiment, the reference voltage generating unit includes:

[0017] a first resistor, a first end of which is connected to the output end of the backup power module;

[0018] a second resistor, a first end of which is connected to the second end of the first resistor and a second end of which is grounded;

[0019] a third resistor, a first end of which is connected to the second end of the first resistor and the first end of the second resistor, and a second end of which is connected to the first input end of the comparison amplification unit;

[0020] The feedback voltage generating unit includes:

[0021] a fourth resistor, a first end of which is connected to the output end of the voltage stabilizing module;

[0022] a fifth resistor, a first end of which is connected to the second end of the fourth resistor, and a second end of which is grounded;

[0023] a sixth resistor, a first end of which is connected to the second end of the fourth resistor and to the first end of the fifth resistor, and a second end of which is connected to the second input end of the comparison amplification unit;

[0024] A seventh resistor has a first end connected to the second end of the sixth resistor and to the second input end of the comparison amplification unit, and a second end grounded.

[0025] In one embodiment, the comparison and amplification unit includes:

[0026] a differential amplifier, whose inverting input terminal is connected to the output terminal of the reference voltage generating unit, and whose non-inverting input terminal is connected to the output terminal of the feedback voltage generating unit, for calculating the difference between the received reference voltage and the feedback voltage, and amplifying the difference to generate the feedback control signal;

[0027] a first diode, an anode of which is connected to the output terminal of the differential amplifier, and a cathode of which is connected to the second input terminal of the voltage stabilizing module;

[0028] An eighth resistor has a first end connected to the inverting input terminal of the differential amplifier and the output terminal of the reference voltage generating unit, and a second end connected to the output terminal of the differential amplifier and the anode of the first diode.

[0029] In one embodiment, the voltage stabilizing module includes:

[0030] a transistor voltage regulator, a first end of which is connected to the output end of the switch module, and a second end of which constitutes the output end of the voltage stabilizing module;

[0031] a ninth resistor, a first end of which is connected to the first end of the transistor voltage regulator and the output end of the switch circuit, and a second end of which is connected to the controlled end of the transistor voltage regulator;

[0032] a tenth resistor, a first end of which is connected to the controlled end of the transistor voltage regulator and to the second end of the ninth resistor, and a second end of which is connected to the output end of the feedback module;

[0033] An eleventh resistor has a first end connected to the second end of the tenth resistor and to the output end of the feedback module, and a second end grounded.

[0034] In one embodiment, it further includes:

[0035] A backup power supply feedback module, whose first input end is connected to the output end of the switch switching module and to the first input end of the voltage stabilizing module, whose second input end is connected to the output end of the backup power supply module and the second input end of the feedback module, and whose output end is connected to the second input end of the voltage stabilizing module, is used to receive the power supply voltage output by the switch switching module and the operating voltage output by the backup power supply module, and generate a conduction control signal when the difference between the voltage at the output end of the backup power supply module and the voltage at the output end of the switch switching module is greater than a second preset voltage, and provide it to the voltage stabilizing module, so that the voltage stabilizing module responds to the conduction control signal to stabilize the received power supply voltage and generate the operating voltage.

[0036] In one embodiment, the backup power supply feedback module includes:

[0037] a twelfth resistor, a first end of which is connected to the output end of the switch module;

[0038] a thirteenth resistor, a first end of which is connected to the second end of the twelfth resistor, and a second end of which is connected to the output end of the backup power module and the second input end of the feedback module;

[0039] a first transistor, an emitter of which is connected to the first end of the twelfth resistor and the output end of the switch module, and a base of which is connected to the second end of the twelfth resistor and the first end of the thirteenth resistor;

[0040] a fourteenth resistor, a first end of which is connected to the collector of the first transistor, and a second end of which is grounded;

[0041] a fifteenth resistor, a first end of which is connected to the second end of the fourteenth resistor and the emitter of the first transistor;

[0042] a second transistor, a collector of which is connected to the second end of the fourteenth resistor, the first end of the fifteenth resistor, and the collector of the first transistor, and a base of which is connected to the second end of the fifteenth resistor;

[0043] a voltage regulator diode, the cathode of which is connected to the base of the second transistor and the second end of the fifteenth resistor, and the anode of which is grounded;

[0044] The second diode has an anode connected to the emitter of the second transistor and a cathode connected to the second input end of the voltage stabilizing module.

[0045] In one embodiment, the switch switching module includes:

[0046] a first switch unit, whose input terminal and controlled terminal are respectively connected to the output terminal of the main power supply module, and configured to trigger conduction when the voltage of the controlled terminal of the first switch unit is greater than a first preset voltage, and trigger shutdown when the voltage of the controlled terminal of the first switch unit is less than or equal to the first preset voltage;

[0047] a first unidirectional conducting unit, wherein the input end of the first unidirectional conducting unit is connected to the output end of the first switch unit, and the output end of the first unidirectional conducting unit is connected to the first input end of the voltage stabilizing module;

[0048] a second switch unit, whose input end is connected to the output end of the backup power supply module, and whose controlled end is connected to the output end of the first switch unit, and is configured to trigger shutdown when the voltage of the controlled end of the second switch unit is greater than a second preset voltage, and trigger conduction when the voltage of the controlled end of the second switch unit is less than or equal to the second preset voltage;

[0049] The second unidirectional conducting unit has an input end connected to the output end of the second switch unit, and an output end connected to the first unidirectional conducting unit and the first input end of the voltage stabilizing module.

[0050] In one embodiment, the first switch unit includes:

[0051] a sixteenth resistor, a first end of which is connected to the output end of the main power module;

[0052] a seventeenth resistor, a first end of which is connected to the second end of the sixteenth resistor, and a second end of which is grounded;

[0053] an eighteenth resistor, a first end of which is connected to the output end of the main power module and the first end of the sixteenth resistor;

[0054] a first switching tube, a source of which is connected to the first end of the sixteenth resistor, the first end of the eighteenth resistor, and the output end of the main power module, a gate of which is connected to the second end of the eighteenth resistor, and a drain of which is connected to the input end of the first unidirectional conducting unit;

[0055] a third triode, a collector of which is connected to the second end of the eighteenth resistor and the gate of the first switching transistor, a base of which is connected to the second end of the sixteenth resistor and the first end of the seventeenth resistor, and an emitter of which is grounded;

[0056] The second switch unit includes:

[0057] a nineteenth resistor, a first end of which is connected to the drain of the first switch tube and the input end of the first unidirectional conduction unit, and a second end of which is grounded;

[0058] a twentieth resistor, a first end of which is connected to the first end of the nineteenth resistor, the drain of the first switch tube, and the input end of the first unidirectional conducting unit;

[0059] a second switching tube, a gate of which is connected to the second end of the twentieth resistor, a source of which is connected to the output end of the backup power module, and a drain of which is connected to the input end of the second unidirectional conducting unit;

[0060] A twenty-first resistor has a first end connected to the second end of the twentieth resistor and the gate of the second switch tube, and a second end connected to the output end of the backup power module.

[0061] A second aspect of an embodiment of the present invention provides a redundant power supply device, including the redundant power supply circuit described above.

[0062] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: the redundant power supply circuit switches and adjusts the output by arranging a switch switching module and a voltage stabilizing module at the rear stage of the main and standby power modules. When the main power module is operating normally, the switch switching module switches to the first channel, and the main power module outputs normally to the external load. When the main power module is abnormal, the switch switching module can automatically identify the circuit abnormality and quickly switch to the standby power module for power supply. This process does not require the participation of additional software identification and control. Since only one power module provides excitation to the external load before and after the switching between the main power module and the standby power module, this not only ensures the quality of the power output but also increases the service life of the power supply. At the same time, when the voltage of the main power module changes, or the output voltage of the switched standby power module changes or surges, the feedback module generates a feedback control signal based on the output working voltage and the power supply voltage provided by the standby power module, so that the voltage stabilizing module performs voltage stabilization adjustment to ensure the output voltage stability, thereby ensuring the normal operation of the external load. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 A schematic diagram of a first structure of a redundant power supply circuit provided in an embodiment of the present invention;

[0064] Figure 2 A second structural diagram of a redundant power supply circuit provided in an embodiment of the present invention;

[0065] Figure 3 A third structural diagram of a redundant power supply circuit provided in an embodiment of the present invention;

[0066] Figure 4 A fourth structural diagram of a redundant power supply circuit provided in an embodiment of the present invention;

[0067] Figure 5 A fifth structural diagram of a redundant power supply circuit provided in an embodiment of the present invention;

[0068] Figure 6 A circuit diagram of a redundant power supply circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0069] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0071] A first aspect of an embodiment of the present invention provides a redundant power supply circuit.

[0072] like Figure 1 As shown, Figure 1 This is a schematic diagram of a first structure of a redundant power supply circuit provided in an embodiment of the present invention. In this embodiment, the redundant power supply circuit includes: a main power module 10, a backup power module 20, a switching module 30, a voltage stabilization module 40, and a feedback module 50. The main power module 10 and the backup power module 20 are used to provide power supply voltage.

[0073] The switch module 30 has a first input terminal connected to the output terminal of the main power module 10 and a second input terminal connected to the output terminal of the backup power module 20, and is configured to control the main power module 10 to supply power when the voltage at the first input terminal of the switch module 30 is greater than a first preset voltage, and to control the backup power module 20 to supply power when the voltage at the first input terminal of the switch module 30 is less than or equal to the first preset voltage;

[0074] The voltage stabilizing module 40 has a first input terminal connected to the output terminal of the switching module 30 and a second input terminal connected to the output terminal of the feedback module 50. The voltage stabilizing module 40 regulates the received power supply voltage in response to the feedback control signal to generate an operating voltage and outputs the voltage.

[0075] The feedback module 50 has a first input end connected to the output end of the voltage stabilizing module 40 and a second input end connected to the output end of the backup power supply module 20, and is used to generate a feedback control signal according to the working voltage output by the voltage stabilizing module 40 and the power supply voltage provided by the backup power supply module 20.

[0076] In this embodiment, the main power supply module 10 and the backup power supply module 20 are both in standby state when they initially work, and output accordingly according to the conduction state of the switch switching module 30. Therefore, during the output switching process, there is no need to wait for the backup power supply module 20 to restart the output. The power output end of the redundant power supply circuit always maintains power output, avoiding the problem of external load power failure and restart due to the delay in the startup output of the backup power supply module 20 during the switching process, thereby improving output reliability.

[0077] Among them, the main power module 10 and the backup power module 20 can be independent power modules, or power conversion circuit structures. When they are power conversion circuits, the power input end of the main power module 10 and the power input end of the backup power module 20 can be connected to the same or different power modules, and their specific structures are not limited. Figure 6 As shown, optionally, the main power supply module 10 includes a first power conversion chip DC1, and the backup power supply module 20 includes a second power conversion chip DC2. The power input ends of the two power conversion chips are connected in common and connected to the corresponding power port VIN, and the DC power input to the power port VIN is converted to output power signals of the same level or different levels.

[0078] The backup power module 20 serves as a backup power source and outputs a power voltage to the feedback module 50, which serves as both the operating power source and the reference power source for the feedback module 50. The feedback module 50 generates corresponding feedback control signals based on the operating voltage output by the voltage regulator module and the power voltage output by the backup power module. This feedback control signal regulates the voltage of the voltage regulator module 40. The switching module 30 switches internal channels based on the power voltage output by the main power module 10, switching the outputs of the main power module 10 and the backup power module 20. The voltage regulator module 40 controls the current flowing through the main power module and regulates the output voltage based on the received feedback control signals, thereby ensuring a stable output operating voltage.

[0079] When the redundant power supply circuit is in normal working condition, when the main power supply module 10 is working normally, the switch switching module 30 detects that the output voltage of the main power supply module 10 is greater than the first preset voltage, the switch switching module 30 switches to the first channel, that is, connects its own first input end and output end, and provides the power supply voltage output by the main power supply module to the voltage stabilizing module 40, and further stabilizes and regulates the power supply voltage output by the main power supply module 10 through the voltage stabilizing module 40 and generates an operating voltage, and then outputs the operating voltage to the external load to ensure stable and reliable operation of the external load.

[0080] The first preset voltage can be set based on the internal switch structure and switching requirements, or based on the voltage error during circuit operation. For example, the first preset voltage can be the difference between the standard voltage power supply and the maximum allowable error. This embodiment does not limit the specific value of the first preset voltage.

[0081] When the main power supply module 10 fails and cuts off the output or outputs under voltage, the switch switching module 30 detects that the output voltage of the main power supply module 10 is less than or equal to the first preset voltage, the switch switching module 30 switches to the second channel, connects its own second input and output ends, and then connects the backup power supply module 20 and the voltage stabilizing module 40. The voltage stabilizing module 40 stabilizes and adjusts the output power of the backup power supply module 20, and ultimately keeps the voltage output to the external load stable.

[0082] Correspondingly, when a surge is generated during the switching process, the voltage stabilizing module 40 implements surge isolation protection to prevent the surge from damaging the external load.

[0083] By setting up the switch switching module 30 and the voltage stabilizing module 40, smooth output control can be performed when the main power module 10 fails, the voltage changes, the voltage changes during the switching process, or a voltage surge occurs, so that the output voltage has continuity and reliability, thereby ensuring that the external load is in a continuous working state.

[0084] Among them, the voltage stabilizing module 40 can adopt a negative feedback regulation circuit or a voltage-controlled switching circuit and other voltage stabilizing modules 40. When a negative feedback regulation circuit is adopted, when the working voltage output by the voltage stabilizing module 40 increases or decreases, the feedback voltage also changes accordingly. At this time, the feedback control signal generated based on the feedback voltage and the reference voltage also changes. The voltage stabilizing module 40 will increase or decrease the internal voltage drop according to the current feedback control signal, thereby reducing or increasing the output voltage, and finally stabilize the working voltage within the preset range.

[0085] When a voltage-controlled switching circuit is used, when the operating voltage output by the voltage stabilizing module 40 is greater than or less than the corresponding reference voltage, the voltage stabilizing module 40 adjusts its own output current according to the voltage of the feedback control signal, thereby changing the output voltage, and ultimately stabilizing the operating voltage within a preset range. The specific structure of the voltage stabilizing module 40 is not limited.

[0086] The switch switching module 30 may include a voltage detection circuit, a switch and other structures, and the specific structure is not limited.

[0087] In one embodiment, Figure 2As shown, the redundant power supply circuit also includes a control port K1, which is connected to the controlled end of the switch switching module 30. The switch switching module 30 is also used to switch the output of the main power module 10 and the backup power module 20 according to the switch switching signal input by the control port K1, wherein the source of the switch switching signal input by the control port K1 can be the trigger output of the button module or the output of the remote control module, and the specific source method is not limited.

[0088] like Figure 3 As shown, in one embodiment, the feedback module 50 includes:

[0089] A reference voltage generating unit 51, whose input terminal is connected to the output terminal of the backup power module 20, is used to generate a reference voltage and output it;

[0090] A feedback voltage generating unit 52, whose input terminal is connected to the output terminal of the voltage stabilizing module 40, is used to generate and output a feedback voltage;

[0091] The comparison amplification unit 53 has a first input end connected to the output end of the reference voltage generating unit 51, a second input end connected to the output end of the feedback voltage generating unit 52, and an output end connected to the second input end of the voltage stabilization module 40. It is used to receive the reference voltage and the feedback voltage, calculate the difference between the reference voltage and the feedback voltage, and amplify the difference to generate a feedback control signal and provide it to the voltage stabilization module 40.

[0092] In this embodiment, the backup power supply module 20 provides a reference voltage to the comparison and amplification unit 53 through the reference voltage generation unit 51 , and the feedback voltage generation unit 52 immediately feeds back the operating voltage output by the voltage stabilization module 40 .

[0093] The feedback voltage and the reference voltage are compared and amplified by the comparison and amplification unit 53 , and then a feedback control signal is generated to the voltage stabilization module 40 to achieve voltage regulation.

[0094] When the operating voltage output by the voltage stabilizing module 40 increases, the feedback voltage increases, and the difference between the feedback voltage and the reference voltage increases. The feedback control signal generated by the comparison and amplification unit 53 also increases accordingly. At this time, the voltage stabilizing module 40 reduces the output operating voltage based on the increased feedback control signal to ensure that a stable and continuous operating voltage can be provided to the workload.

[0095] When the operating voltage output by the voltage stabilizing module 40 becomes smaller, the feedback voltage becomes smaller, and the difference between the feedback voltage and the reference voltage becomes smaller. The feedback control signal generated by the comparison and amplification unit 53 also becomes smaller. At this time, the voltage stabilizing module 40 increases the output operating voltage based on the smaller feedback control signal to achieve voltage stabilization adjustment to ensure that a stable and continuous operating voltage can be provided for the workload.

[0096] The reference voltage generating unit 51 may adopt a voltage divider circuit, a voltage conversion circuit, a mutual inductor and the like. Similarly, the feedback voltage generating unit 52 may also adopt a voltage divider circuit, a voltage conversion circuit, a mutual inductor and the like.

[0097] The comparison and amplification unit 53 may adopt a corresponding operational amplifier U1 , a transistor amplifier circuit, etc., and the specific structure is not limited.

[0098] like Figure 6 As shown, in one embodiment, the reference voltage generating unit 51 includes:

[0099] A first resistor R1, a first end of which is connected to the output end of the backup power module 20;

[0100] a second resistor R2, a first end of which is connected to the second end of the first resistor R1, and a second end of which is grounded;

[0101] The third resistor R3 has a first end connected to the second end of the first resistor R1 and the first end of the second resistor R2 , and a second end connected to the first input end of the comparison amplification unit 53 .

[0102] The feedback voltage generating unit 52 includes:

[0103] a fourth resistor R4, a first end of which is connected to the output end of the voltage stabilizing module 40;

[0104] a fifth resistor R5, a first end of which is connected to the second end of the fourth resistor R4, and a second end of which is grounded;

[0105] a sixth resistor R6 , having a first end connected to the second end of the fourth resistor R4 and to the first end of the fifth resistor R5 , and a second end connected to the second input end of the comparison amplification unit 53 ;

[0106] The seventh resistor R7 has a first end connected to the second end of the sixth resistor R6 and to the second input end of the comparison and amplification unit 53 , and a second end grounded.

[0107] In this embodiment, the first resistor R1 and the second resistor R2 constitute a first resistor R1 voltage divider circuit, which divides the output voltage of the backup power module 20. The divided voltage is further divided by the third resistor R3, and finally outputs a reference voltage to the comparison amplifier unit 53.

[0108] At the same time, the fourth resistor R4 and the fifth resistor R5 constitute a second resistor R2 voltage divider circuit, and the sixth resistor R6 and the seventh resistor R7 constitute a third resistor R3 voltage divider circuit, thereby dividing the working voltage output by the voltage stabilizing module 40 for feedback and outputting the feedback voltage to the comparison amplification unit 53, wherein the reference voltage and the feedback voltage can be adjusted accordingly by changing the resistance value of each resistor.

[0109] Please continue reading Figure 6 In one embodiment, the comparison and amplification unit 53 includes:

[0110] A differential amplifier U1, whose inverting input terminal is connected to the output terminal of the reference voltage generating unit 51 and whose non-inverting input terminal is connected to the output terminal of the feedback voltage generating unit 52, is used to determine the difference between the received reference voltage and the feedback voltage, and amplify the difference to generate a feedback control signal;

[0111] a first diode D1 , having an anode connected to the output terminal of the differential amplifier U1 and a cathode connected to the second input terminal of the voltage stabilizing module 40 ;

[0112] The eighth resistor R8 has a first end connected to the inverting input terminal of the differential amplifier U1 and the output terminal of the reference voltage generating unit, and a second end connected to the output terminal of the differential amplifier U1 and the anode of the first diode.

[0113] In this embodiment, the resistance values ​​of the third resistor R3 and the sixth resistor R6 are equal, and the resistance values ​​of the seventh resistor R7 and the eighth resistor are equal. The differential amplifier U1 compares and amplifies the ratio of the received feedback voltage and the reference voltage, wherein the amplification factor is the ratio of the resistance values ​​of the eighth resistor R8 and the third resistor R3, and finally outputs a feedback control signal corresponding to the voltage size to the voltage stabilization module 40 to achieve voltage stabilization regulation.

[0114] The differential amplifier U1 can be powered by the backup power module 20, or the working power can be provided by an independent power module. The specific power supply method is not limited. In one embodiment, in order to simplify the circuit structure, the power supply end of the differential amplifier U1 is connected to the output end of the backup power module 20, and the working voltage is obtained from the backup power module 20.

[0115] The first diode D1 realizes a unidirectional conduction function to prevent signal crosstalk from affecting the operation of the operational amplifier U1.

[0116] Please continue reading Figure 6 In one embodiment, the voltage stabilizing module 40 includes:

[0117] A transistor voltage regulator M1, a first end of which is connected to the output end of the switch module 30, and a second end of which constitutes the output end of the voltage stabilizing module 40;

[0118] a ninth resistor R9, a first end of which is connected to the first end of the transistor voltage regulator M1 and the output end of the switch circuit, and a second end of which is connected to the controlled end of the transistor voltage regulator M1;

[0119] a tenth resistor R10 , a first end of which is connected to the controlled end of the transistor voltage regulator M1 and to the second end of the ninth resistor R9 , and a second end of which is connected to the output end of the feedback module 50 ;

[0120] The eleventh resistor R11 has a first end connected to the second end of the tenth resistor R10 and to the output end of the feedback module 50 , and a second end grounded.

[0121] In this embodiment, the transistor voltage regulator M1 adjusts its own output current according to the voltage of the received feedback control signal, thereby changing the output voltage.

[0122] Specifically, when the operating voltage output by the voltage stabilizing module 40 drops due to a change in the previous stage output voltage or the load, the voltage of the connection node between the fourth resistor R4 and the fifth resistor R5 drops, that is, the voltage of the positive input terminal of the differential amplifier U1 drops, and the voltage difference between the positive input terminal and the negative input terminal of the differential amplifier U1 drops. The voltage of the feedback control signal amplified by the differential amplifier U1 drops, and the voltage difference between the first terminal and the controlled terminal of the transistor voltage regulator M1 increases, so that the current of the transistor voltage regulator M1 increases. The increase in output current causes the output voltage to rise, completing the negative feedback regulation, so that the operating voltage output by the voltage stabilizing module 40 returns to the normal potential.

[0123] Similarly, when the operating voltage output by the voltage stabilizing module 40 rises due to a change in the output voltage of the previous stage or a load, the voltage of the connection node between the fourth resistor R4 and the fifth resistor R5 rises, that is, the voltage of the positive input terminal of the differential amplifier U1 rises, and the voltage difference between the positive input terminal and the negative input terminal of the differential amplifier U1 rises. The voltage of the feedback control signal amplified by the differential amplifier U1 rises, and the voltage difference between the first terminal and the controlled terminal of the transistor voltage regulator M1 decreases, so that the current of the transistor voltage regulator M1 decreases. The reduction in output current causes the output voltage to decrease, completing the negative feedback regulation, so that the operating voltage output by the voltage stabilizing module 40 returns to the normal potential.

[0124] Wherein, corresponding to the feedback control signal and the voltage regulation output state of the voltage stabilizing module 40 , the transistor voltage regulator M1 is a P-channel field effect transistor.

[0125] like Figure 4 As shown, in one embodiment, it also includes:

[0126] The backup power supply feedback module 60 has a first input end connected to the output end of the switch switching module 30 and to the first input end of the voltage stabilizing module 40, a second input end connected to the output end of the backup power supply module 20, and an output end connected to the second input end of the voltage stabilizing module 40. It is used to receive the power supply voltage output by the switch switching module 30 and the power supply voltage output by the backup power supply module 20, and generate a conduction control signal when the difference between the voltage at the output end of the backup power supply module and the voltage at the output end of the switch switching module is greater than a second preset voltage, and provide it to the voltage stabilizing module 40 to control the voltage stabilizing module 40 to conduct and output an output voltage corresponding to the size of the conduction control signal.

[0127] In this embodiment, the backup power supply feedback module 60 implements status detection and feedback of the backup power supply module 20, and implements output control of the voltage stabilizing module 40. Since the feedback module 50 is provided with a reference voltage by the backup power supply module 20 through the reference voltage generating unit 51, or the feedback module 50 is provided with a reference voltage and an operating voltage by the backup power supply module 20 through the reference voltage generating unit 51, when the backup power supply module 20 is abnormally powered off first, the feedback module 50 has no reference voltage input, or no reference voltage and an operating voltage input, and the feedback module 50 operates abnormally, causing the voltage stabilizing module 40 to be abnormally shut down, thereby causing the external load to be abnormally shut down. In order to solve this problem, when the output voltage of the backup power supply module 20 is less than the output voltage of the switching module 30, that is, when the backup power supply module 20 is abnormally powered off, the backup power supply feedback module 60 generates a conduction control signal and provides it to the voltage stabilizing module 40, so that the voltage at the second input end of the voltage stabilizing module 40 remains unchanged. After receiving the conduction control signal, the voltage stabilizing module 40 is turned on and outputs a corresponding current and an operating voltage to the external load, ensuring that the main power supply module 10 reliably supplies power to the external load. In this embodiment, assuming that the main power module and the backup power module are working normally, the voltage of the second input terminal of the voltage stabilizing module 40 is 3.0V. Then, when the backup power supply fails, the backup power supply feedback circuit can still ensure that the voltage of the second input terminal of the voltage stabilizing module 40 is 3.0V, so that the voltage stabilizing module maintains normal operation.

[0128] The backup power supply feedback module 60 may adopt a comparator, a switch tube or the like structure, and output an undervoltage protection signal of corresponding magnitude according to the magnitude of the voltage input at both ends.

[0129] like Figure 6 As shown, in one embodiment, the backup power feedback module 60 includes:

[0130] a twelfth resistor R12, a first end of which is connected to the output end of the switch module 30;

[0131] a thirteenth resistor R13, a first end of which is connected to the second end of the twelfth resistor R12, and a second end of which is connected to the output end of the backup power module 20 and the second input end of the feedback module;

[0132] A first transistor Q1, whose emitter is connected to the first end of the twelfth resistor R12 and the output end of the switch module 30, and whose base is connected to the second end of the twelfth resistor R12 and the first end of the thirteenth resistor R13;

[0133] a fourteenth resistor R14 , a first end of which is connected to the collector of the first transistor Q1 , and a second end of which is grounded;

[0134] a fifteenth resistor R15, a first end of which is connected to the second end of the fourteenth resistor R14 and the emitter of the first transistor Q1;

[0135] a second transistor Q2, having a collector connected to the second end of the fourteenth resistor R14, a first end of the fifteenth resistor R15, and the collector of the first transistor Q1, and a base connected to the second end of the fifteenth resistor R15;

[0136] a voltage regulator diode ZD1 , having a cathode connected to the base of the second transistor Q2 and the second end of the fifteenth resistor R15 , and an anode grounded;

[0137] The second diode D2 has an anode connected to the emitter of the second transistor Q2 , and a cathode connected to the second input end of the voltage stabilizing module 40 .

[0138] In this embodiment, the output voltage of the switching module 30 is output to the emitter of the first transistor Q1, and the base of the first transistor Q1 receives the output voltage of the backup power module 20. When the backup power module 20 is in normal standby output, the feedback module 50 normally outputs the feedback control signal. At the same time, the output voltage of the backup power module 20 is greater than or equal to the output voltage of the switching module 30, the first transistor Q1 is turned off, and the backup power feedback module 60 has no control signal output.

[0139] When the backup power supply module 20 is abnormally powered off, the feedback module 50 operates abnormally. At this time, the output voltage of the backup power supply module 20 is lower than the output voltage of the switch module 30, the first transistor Q1 is turned on, and the second transistor Q2 forms an emitter follower. Finally, the terminal voltage of the voltage regulator ZD1 is subtracted from the voltage between the base and emitter of the second transistor Q2 and the voltage drop of the second diode D2, and finally a conduction control signal of a corresponding voltage size is output to the voltage regulator module 40, ensuring that the voltage regulator module 40 is reliably turned on and outputs a working voltage of a corresponding size to the external load.

[0140] The second diode D2 realizes a unidirectional conduction function to prevent signal crosstalk from affecting the normal operation of the backup power feedback module 60 .

[0141] Corresponding to the conduction state of each switch tube, in one embodiment, the first transistor Q1 is a PNP transistor, and the second transistor Q2 is an NPN transistor.

[0142] like Figure 5 As shown, in one embodiment, the switch switching module 30 includes:

[0143] The first switch unit 31 has an input terminal and a controlled terminal connected to the output terminal of the main power supply module 10, respectively, and is configured to trigger conduction when the voltage at the controlled terminal of the first switch unit 31 is greater than a first preset voltage, and trigger shutdown when the voltage at the controlled terminal of the first switch unit 31 is less than or equal to the first preset voltage;

[0144] A first unidirectional conducting unit 32 , wherein the input end of the first unidirectional conducting unit 32 is connected to the output end of the first switch unit 31 , and the output end thereof is connected to the first input end of the voltage stabilizing module 40 ;

[0145] The second switch unit 33 has an input end connected to the output end of the backup power supply module 20 and a controlled end connected to the output end of the first switch unit 31, and is configured to trigger shutdown when the voltage at the controlled end of the second switch unit 33 is greater than a second preset voltage, and trigger conduction when the voltage at the controlled end of the second switch unit 33 is less than or equal to the second preset voltage;

[0146] The second unidirectional conducting unit 32 has an input end connected to the output end of the second switch unit 33 , and an output end connected to the first unidirectional conducting unit 32 and the first input end of the voltage stabilizing module 40 .

[0147] In this embodiment, when the main power supply module 10 is operating normally, the first switch unit 31 adaptively turns on when it detects that the output voltage of the main power supply module 10 is greater than a first preset voltage, and the second switch unit 33 is controlled to turn off when it detects that the voltage output by the first switch unit 31 is greater than a second preset voltage. The size of the second preset voltage can be set accordingly, for example, 0V. At this time, the first switch unit 31 and the first unidirectional conduction unit 32 connect the main power supply module 10 and the voltage stabilizing module 40, completing the switching output of the main power supply module 10, and the output power of the main power supply module 10 is output to the external load through the voltage stabilizing module 40, completing the main power supply.

[0148] When the main power supply module 10 fails and cuts off the output, the first switch unit 31 is controlled to shut down when it detects that the output voltage of the main power supply module 10 is less than the first preset voltage. At the same time, when the second switch unit 33 detects that the output voltage of the first switch unit 31 is less than or equal to the second preset voltage, the second switch unit 33 is triggered to turn on. At this time, the second switch unit 33 and the second unidirectional conduction unit 34 are connected to the backup power supply module 20 and the voltage stabilizing module 40 to complete the switching output of the backup power supply module 20. During the switching process, the power output end of the redundant power supply unit always maintains the output state, so that the external load can work stably.

[0149] The first switch unit 31 and the second switch unit 33 may adopt corresponding voltage detection structures, switch structures, etc., and the specific structures are not limited.

[0150] The first unidirectional conduction unit 32 and the second unidirectional conduction unit 34 are used to realize unidirectional input and output of power supply, avoid the backflow problem between the main power supply module 10, the backup power supply module 20 and the voltage stabilizing module 40, and improve the current output reliability and the safety of the overall unit of the redundant power supply unit.

[0151] The first one-way conducting unit 32 and the second one-way conducting unit 34 can adopt corresponding one-way conducting modules, such as relays, diodes, etc. Figure 6 As shown, the first unidirectional conducting unit 32 includes a third diode D3, the anode and cathode of the third diode D3 respectively constitute the input end and output end of the first unidirectional conducting unit 32, and at the same time, the second unidirectional conducting unit 34 includes a fourth diode D4, the anode and cathode of the fourth diode D4 respectively constitute the input end and output end of the second unidirectional conducting unit 34.

[0152] like Figure 6 As shown, in one embodiment, the first switch unit 31 includes:

[0153] a sixteenth resistor R16, a first end of which is connected to the output end of the main power module 10;

[0154] a seventeenth resistor R17, a first end of which is connected to the second end of the sixteenth resistor R16, and a second end of which is grounded;

[0155] an eighteenth resistor R18 , a first end of which is connected to the output end of the main power module 10 and a first end of the sixteenth resistor R16 ;

[0156] a first switch tube M2, having a source connected to the first end of the sixteenth resistor R16, the first end of the eighteenth resistor R18, and the output end of the main power module 10, a gate connected to the second end of the eighteenth resistor R18, and a drain connected to the input end of the first unidirectional conduction unit 32;

[0157] a third transistor Q3, having a collector connected to the second end of the eighteenth resistor R18 and the gate of the first switch tube M2, a base connected to the second end of the sixteenth resistor R16 and the first end of the seventeenth resistor R17, and an emitter grounded;

[0158] The second switch unit 33 includes:

[0159] a nineteenth resistor R19, a first end of which is connected to the drain of the first switch tube M2 and the input end of the first unidirectional conducting unit 32, and a second end of which is grounded;

[0160] a twentieth resistor R20, a first end of which is connected to the first end of the nineteenth resistor R19, the drain of the first switch M2, and the input end of the first unidirectional conducting unit 32;

[0161] a second switch tube M3, whose gate is connected to the second end of the twentieth resistor R20, whose source is connected to the output end of the backup power module 20, and whose drain is connected to the input end of the second unidirectional conducting unit 32;

[0162] The twenty-first resistor R21 has a first end connected to the second end of the twentieth resistor R20 and the gate of the second switch tube M3 , and a second end connected to the output end of the backup power module 20 .

[0163] In this embodiment, the sixteenth resistor R16 and the seventeenth resistor R17 form a voltage divider circuit.

[0164] During operation, when the main power module 10 operates normally, the third transistor Q3 and the first switch tube M2 are triggered to turn on, and the second switch tube M3 is triggered to turn off after receiving a high level, cutting off the path between the backup power module 20 and the voltage stabilizing module 40, and the output power of the main power module 10 is output to the external load through the first switch tube M2, the third diode D3 and the voltage stabilizing module 40.

[0165] When the main power supply module 10 is abnormally powered off, the third transistor Q3 and the first switch tube M2 are triggered to turn off, and the second switch tube M3 is triggered to turn on after receiving a low level. At this time, the output power of the backup power supply module 20 is output to the external load through the second switch tube M3, the fourth diode D4 and the voltage regulator module 40.

[0166] During the switching process, the power output end of the redundant power supply circuit always maintains the output state, so that the output voltage has continuity and reliability, thereby ensuring that the external load is in a continuous working state.

[0167] Corresponding to the on-off relationship of the above circuit, in one embodiment, the third transistor Q3 is an NPN transistor, and the first switch tube M2 and the second switch tube M3 are both P-channel switch tubes.

[0168] The present invention also proposes a redundant power supply device, which includes a redundant power supply circuit. The specific structure of the redundant power supply circuit refers to the above-mentioned embodiment. Since this redundant power supply device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0169] In this embodiment, the redundant power supply device may include at least one circuit board, and the main power supply module 10, the backup power supply module 20, the switch switching module 30, the voltage stabilizing module 40, the feedback module 50 and the backup power supply feedback module 60 are correspondingly arranged on the circuit board. The circuit board is connected to the power supply end of the external load to realize redundant power supply.

[0170] The present invention also proposes an electronic device, which includes a redundant power supply device. The specific structure of the redundant power supply device refers to the above-mentioned embodiment. Since this electronic device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0171] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A redundant power supply circuit, characterized in that: include: Main power module; Backup power module; a switch switching module, a first input end of which is connected to the output end of the main power module, and a second input end of which is connected to the output end of the backup power module, for controlling the main power module to supply power when the voltage at the first input end of the switch switching module is greater than a first preset voltage, and controlling the backup power module to supply power when the voltage at the first input end of the switch switching module is less than or equal to the first preset voltage; a voltage stabilizing module, wherein a first input terminal of the voltage stabilizing module is connected to the output terminal of the switching module, and a second input terminal of the voltage stabilizing module is connected to the output terminal of the feedback module, and the voltage stabilizing module generates an operating voltage by regulating the received power supply voltage in response to the feedback control signal, and outputs the operating voltage; The feedback module has a first input terminal connected to the output terminal of the voltage stabilizing module and a second input terminal connected to the output terminal of the backup power module, and is used to generate the feedback control signal according to the working voltage output by the voltage stabilizing module and the power supply voltage provided by the backup power module; A backup power supply feedback module, whose first input end is connected to the output end of the switch switching module and to the first input end of the voltage stabilizing module, whose second input end is connected to the output end of the backup power supply module and the second input end of the feedback module, and whose output end is connected to the second input end of the voltage stabilizing module, is used to receive the power supply voltage output by the switch switching module and the operating voltage output by the backup power supply module, and generate a conduction control signal when the difference between the voltage at the output end of the backup power supply module and the voltage at the output end of the switch switching module is greater than a second preset voltage, and provide it to the voltage stabilizing module, so that the voltage stabilizing module responds to the conduction control signal to stabilize the received power supply voltage and generate the operating voltage.

2. The redundant power supply circuit according to claim 1, wherein: The feedback module includes: A reference voltage generating unit, whose input end is connected to the output end of the backup power supply module, is used to generate a reference voltage and output it; A feedback voltage generating unit, whose input end is connected to the output end of the voltage stabilizing module, is used to generate and output a feedback voltage; A comparison amplification unit, whose first input terminal is connected to the output terminal of the reference voltage generating unit, whose second input and output terminal is connected to the output terminal of the feedback voltage generating unit, and whose output terminal is connected to the second input terminal of the voltage stabilization module, is used to receive the reference voltage and the feedback voltage, calculate the difference between the reference voltage and the feedback voltage, and amplify the difference to generate the feedback control signal and provide it to the voltage stabilization module.

3. The redundant power supply circuit according to claim 2, wherein: The reference voltage generating unit includes: a first resistor, a first end of which is connected to the output end of the backup power module; a second resistor, a first end of which is connected to the second end of the first resistor and a second end of which is grounded; a third resistor, a first end of which is connected to the second end of the first resistor and the first end of the second resistor, and a second end of which is connected to the first input end of the comparison amplification unit; The feedback voltage generating unit includes: a fourth resistor, a first end of which is connected to the output end of the voltage stabilizing module; a fifth resistor, a first end of which is connected to the second end of the fourth resistor, and a second end of which is grounded; a sixth resistor, a first end of which is connected to the second end of the fourth resistor and the first end of the fifth resistor, and a second end of which is connected to the second input end of the comparison amplification unit; A seventh resistor has a first end connected to the second end of the sixth resistor and the second input end of the comparison amplification unit, and a second end grounded.

4. The redundant power supply circuit according to claim 2, wherein: The comparison and amplification unit includes: a differential amplifier, whose inverting input terminal is connected to the output terminal of the reference voltage generating unit, and whose non-inverting input terminal is connected to the output terminal of the feedback voltage generating unit, for calculating the difference between the received reference voltage and the feedback voltage, and amplifying the difference to generate the feedback control signal; a first diode, an anode of which is connected to the output terminal of the differential amplifier, and a cathode of which is connected to the second input terminal of the voltage stabilizing module; An eighth resistor has a first end connected to the inverting input terminal of the differential amplifier and the output terminal of the reference voltage generating unit, and a second end connected to the output terminal of the differential amplifier and the anode of the first diode.

5. The redundant power supply circuit according to claim 4, wherein: The voltage stabilizing module includes: a transistor voltage regulator, a first end of which is connected to the output end of the switch module, and a second end of which constitutes the output end of the voltage stabilizing module; a ninth resistor, a first end of which is connected to the first end of the transistor voltage regulator and the output end of the switch module, and a second end of which is connected to the controlled end of the transistor voltage regulator; a tenth resistor, a first end of which is connected to the controlled end of the transistor voltage regulator and the second end of the ninth resistor, and a second end of which is connected to the output end of the feedback module; An eleventh resistor has a first end connected to the second end of the tenth resistor and the output end of the feedback module, and a second end grounded.

6. The redundant power supply circuit according to claim 1, wherein: The backup power supply feedback module includes: a twelfth resistor, a first end of which is connected to the output end of the switch module; a thirteenth resistor, a first end of which is connected to the second end of the twelfth resistor, and a second end of which is connected to the output end of the backup power module and the second input end of the feedback module; a first transistor, an emitter of which is connected to the first end of the twelfth resistor and the output end of the switch module, and a base of which is connected to the second end of the twelfth resistor and the first end of the thirteenth resistor; a fourteenth resistor, a first end of which is connected to the collector of the first transistor, and a second end of which is grounded; a fifteenth resistor, a first end of which is connected to the second end of the fourteenth resistor and the emitter of the first transistor; a second transistor, a collector of which is connected to the second end of the fourteenth resistor, the first end of the fifteenth resistor, and the collector of the first transistor, and a base of which is connected to the second end of the fifteenth resistor; a voltage regulator diode, the cathode of which is connected to the base of the second transistor and the second end of the fifteenth resistor, and the anode of which is grounded; The second diode has an anode connected to the emitter of the second transistor and a cathode connected to the second input end of the voltage stabilizing module.

7. The redundant power supply circuit according to claim 1, wherein: The switch switching module includes: a first switch unit, whose input terminal and controlled terminal are respectively connected to the output terminal of the main power supply module, and configured to trigger conduction when the voltage of the controlled terminal of the first switch unit is greater than a first preset voltage, and trigger shutdown when the voltage of the controlled terminal of the first switch unit is less than or equal to the first preset voltage; a first unidirectional conducting unit, wherein the input end of the first unidirectional conducting unit is connected to the output end of the first switch unit, and the output end of the first unidirectional conducting unit is connected to the first input end of the voltage stabilizing module; a second switch unit, whose input end is connected to the output end of the backup power supply module, and whose controlled end is connected to the output end of the first switch unit, and is configured to trigger shutdown when the voltage of the controlled end of the second switch unit is greater than a second preset voltage, and trigger conduction when the voltage of the controlled end of the second switch unit is less than or equal to the second preset voltage; The second unidirectional conducting unit has an input end connected to the output end of the second switch unit, and an output end connected to the first unidirectional conducting unit and the first input end of the voltage stabilizing module.

8. The redundant power supply circuit according to claim 7, wherein: The first switch unit includes: a sixteenth resistor, a first end of which is connected to the output end of the main power module; a seventeenth resistor, a first end of which is connected to the second end of the sixteenth resistor, and a second end of which is grounded; an eighteenth resistor, a first end of which is connected to the output end of the main power module and the first end of the sixteenth resistor; a first switching tube, a source of which is connected to the first end of the sixteenth resistor, the first end of the eighteenth resistor, and the output end of the main power module, a gate of which is connected to the second end of the eighteenth resistor, and a drain of which is connected to the input end of the first unidirectional conducting unit; a third triode, a collector of which is connected to the second end of the eighteenth resistor and the gate of the first switching transistor, a base of which is connected to the second end of the sixteenth resistor and the first end of the seventeenth resistor, and an emitter of which is grounded; The second switch unit includes: a nineteenth resistor, a first end of which is connected to the drain of the first switch tube and the input end of the first unidirectional conduction unit, and a second end of which is grounded; a twentieth resistor, a first end of which is connected to the first end of the nineteenth resistor, the drain of the first switch tube, and the input end of the first unidirectional conducting unit; a second switching tube, a gate of which is connected to the second end of the twentieth resistor, a source of which is connected to the output end of the backup power module, and a drain of which is connected to the input end of the second unidirectional conducting unit; A twenty-first resistor has a first end connected to the second end of the twentieth resistor and the gate of the second switch tube, and a second end connected to the output end of the backup power module.

9. A redundant power supply device, characterized in that: The redundant power supply circuit comprises the redundant power supply circuit according to any one of claims 1 to 8.

Images