Redundant power supply alarm circuit and redundant power supply circuit

Abstract

The embodiment of the invention provides a redundant power supply alarm circuit and a redundant power supply circuit, and relates to the technical field of circuit protection alarm, the redundant power supply alarm circuit comprises a first detection unit and a second detection unit, a first switching device is arranged in the first detection unit, and the output end of the first switching device is connected with a first path of power supply; the control end of the first switching device is connected with the second power supply, an alarm control output end is arranged between the output end of the first switching device and the first power supply, a second switching device is arranged in the second detection unit, the output end of the second switching device is connected with the second power supply, and the control end of the second switching device is connected with the first power supply. And an alarm control output end is arranged between the output end of the second switching device and the second path of power supply. According to the embodiment of the invention, the circuit structure is formed by discrete components, the basic circuit components such as the transistors, the diodes and the resistors are utilized, and the alarm control output can be obtained only by inputting two paths of power supplies.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of circuit protection alarms, and in particular to a redundant power supply alarm circuit and a redundant power supply circuit. Background Art

[0002] The power alarm methods in related technologies are as follows:

[0003] 1. Use dedicated circuits to collect information from each power supply. A single-chip microcontroller or FPGA / CPLD processes the information and logically generates alarm outputs. This solution, which uses dedicated circuits to collect information from each power supply, has the disadvantage of requiring dedicated circuits and a processor such as a single-chip microcontroller for data processing.

[0004] 2. The CPU or BMC management collects power information from each power module via the PMBus bus. The CPU or BMC management processor processes the power information, makes decisions, and outputs alarm information. The disadvantage of this solution is that the power modules must support the PMBus protocol, which consumes CPU or BMC management processor resources.

[0005] 3. The dedicated redundant power supply has a built-in buzzer alarm. The disadvantage of this solution is that it only has sound alarms and cannot provide sound and light alarms.

[0006] In response to the above problems, the relevant technologies have not yet proposed effective technical solutions, which can no longer meet people's requirements and are in urgent need of improvement. Summary of the Invention

[0007] The main purpose of the embodiments of the present application is to provide a redundant power supply alarm circuit and a redundant power supply circuit, which can complete the alarm output by simply connecting two paths of the redundant power supply through discrete components, thereby solving the shortcomings of the related art.

[0008] The embodiments of the present application are implemented using the following technical solutions:

[0009] According to one aspect of an embodiment of the present application, a redundant power supply alarm circuit is provided, including a first detection unit and a second detection unit, wherein: a first switching device is provided in the first detection unit, the output end of the first switching device is connected to the first power supply, the control end of the first switching device is connected to the second power supply, and an alarm control output end is provided between the output end of the first switching device and the first power supply; a second switching device is provided in the second detection unit, the output end of the second switching device is connected to the second power supply, the control end of the second switching device is connected to the first power supply, and the alarm control output end is provided between the output end of the second switching device and the second power supply.

[0010] According to at least one specific implementation manner of the embodiments of the present application, the first switching device is a first transistor, the output end of the first switching device is the collector of the first transistor, the control end of the first switching device is the base of the first transistor, and the emitter of the first transistor is grounded.

[0011] According to at least one specific implementation manner of the embodiments of the present application, the collector of the first transistor is connected to the first power supply through a first resistor, the base of the first transistor is connected to the second power supply through a second resistor, a third resistor is connected between the base and the emitter of the first transistor, and the second and third resistors form a voltage dividing structure for the second power supply.

[0012] According to at least one specific implementation manner of the embodiments of the present application, a first capacitor is further included. One end of the first capacitor is connected between the second resistor and the base of the second transistor, and the other end of the first capacitor is connected to the emitter of the second transistor.

[0013] According to at least one specific implementation manner of the embodiments of the present application, a first diode is further included. The positive pole of the first diode is connected between the first resistor and the collector of the first transistor, and the negative pole of the first diode is connected to the alarm control output end.

[0014] According to at least one specific implementation manner of the embodiments of the present application, the second switching device is a second transistor, the output end of the second switching device is the collector of the second transistor, the control end of the second switching device is the base of the second transistor, and the emitter of the second transistor is grounded.

[0015] According to at least one specific implementation manner of the embodiments of the present application, the collector of the second transistor is connected to the second power supply through a fourth resistor, the base of the second transistor is connected to the first power supply through a fifth resistor, a sixth resistor is connected between the base and the emitter of the second transistor, and a second diode is further included. The positive pole of the second diode is connected between the fourth resistor and the collector of the second transistor, and the negative pole of the second diode is connected to the alarm control output end.

[0016] According to at least one specific implementation manner of the embodiments of the present application, a light emitting diode is further included. One end of the light emitting diode is connected to the alarm control output end, and the other end is connected to one end of a ninth resistor, and the other end of the ninth resistor is grounded.

[0017] According to at least one specific implementation manner of the embodiments of the present application, it further includes a buzzer, a third transistor, and a third diode. The base of the third transistor is connected to the alarm control output terminal. The collector of the third transistor is connected to one end of the buzzer. The other end of the buzzer is connected to one end of a seventh resistor. The other end of the seventh resistor is connected to a power supply. The positive electrode of the third diode is connected between the buzzer and the third transistor, and the negative electrode of the third diode is connected between the buzzer and the seventh resistor. An eighth resistor and a second capacitor are connected in parallel between the base and the emitter of the third transistor.

[0018] According to another aspect of the embodiments of the present application, a redundant power supply circuit is provided, and the redundant power supply alarm circuit described above is provided in the redundant power supply circuit.

[0019] The beneficial technical effects of the embodiments of the present application are as follows:

[0020] In the redundant power supply alarm circuit provided by the embodiments of the present application, a circuit structure is formed by discrete components. By using basic circuit components such as transistors, diodes, and resistors, only two input power supplies are required to obtain an alarm control output.

[0021] In the redundant power supply alarm circuit of the embodiments of the present application, by reasonably selecting the resistance value of the output terminal, the buzzer and the LED can be directly driven to realize various alarm functions such as buzzer alarm, LED alarm, and simultaneous alarm of the buzzer and the LED. The redundant circuit alarm circuit can be applied to the redundant power supply circuit without modifying the power supply itself. Only the outputs of two or more power supplies need to be collected as the input of the redundant alarm circuit to generate audible and visual alarms. No matter which power supply has a voltage drop fault, an alarm will occur, realizing real-time alarm monitoring of the redundant power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation manners of the embodiments of the present application or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the specific implementation manners or the related art descriptions. Obviously, the following drawings are only some implementation manners of the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 This is the main application scenario of the redundant power supply alarm circuit of the embodiments of the present application.

[0024] Figure 2 This is the principle block diagram of the redundant power supply alarm circuit of the embodiments of the present application.

[0025] Figure 3It is the circuit schematic diagram of the redundant power supply alarm circuit in the embodiment of the present application.

[0026] Figure 4 It is the circuit schematic diagram of the redundant power supply alarm circuit in the embodiment of the present application after the improvement of the voltage division structure.

[0027] Figure 5 It is the circuit schematic diagram of the redundant power supply alarm circuit in the embodiment of the present application after the improvement of the alarm control output terminal.

[0028] Figure 6 It is the circuit schematic diagram of the redundant power supply alarm circuit in the embodiment of the present application for driving the buzzer through a triode. Specific embodiments

[0029] In order to enable those skilled in the art to better understand the solution of the embodiment of the present application, the technical solutions in the embodiment of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the embodiment of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the embodiment of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the specification, claims and above-mentioned drawings of the embodiment of the present application are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present application described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices. Without conflict, the embodiments in the embodiment of the present application and the features in the embodiments can be combined with each other. The embodiment of the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0031] In the related art, dedicated circuits are used to collect power supply information of each path. The single-chip microcomputer or FPGA / CPLD processes the power supply information, which can collect and process the power supply information of each path in detail and can implement complex alarm logics. However, dedicated acquisition circuits need to be designed, increasing the hardware cost and design complexity. Processors such as single-chip microcomputers or FPGA / CPLDs need to write corresponding programs to process the power supply information, resulting in a long development cycle. When the CPU or BMC manages the power supply information of each power module collected through the PMBus bus, although it can conveniently communicate with the power modules supporting this protocol and can obtain detailed information of the power modules, the power modules must support the PMBus protocol, which limits the application scope of this method. Moreover, the CPU or BMC management will occupy certain hardware and software resources to process the power supply information or give alarms, which will have a certain impact on the overall power management system. No redundant power supply alarm circuit with a simple structure and low cost has been proposed in the related art. In view of this situation, the embodiments of the present application propose and design a redundant power supply alarm circuit, reducing the dependence on dedicated hardware (such as single-chip microcomputers, FPGA / CPLDs), shortening the development cycle and hardware cost, and improving the efficiency and reliability of managing the redundant power supply circuit.

[0032] As Figure 1 shown, in the main application scenario of the embodiments of the present application, the redundant power supply alarm circuit includes a first detection unit Ⅰ and a second detection unit Ⅱ. The first and second detection units Ⅰ and Ⅱ have a common connection end - the alarm control output end. Different from the related art, in the main application scenario of the embodiments of the present application, only general discrete components can be used. The first and second detection units Ⅰ and Ⅱ are connected to two power supplies. The first power supply in the two power supplies is used as the detection input, and the second power supply is used as the output power supply. Only the above two power supplies need to be collected as the power input in the main application scenario. By using the first and second detection units Ⅰ and Ⅱ, corresponding redundant power supply alarms can be generated. No matter which power supply has a voltage drop fault, an alarm signal can be sent in real time. By adding other circuits, when the alarm control output end outputs a high level, the buzzer and LED can also be directly driven to provide an audible and visual alarm service.

[0033] As Figure 2 shown, Figure 2 shows the circuit principle block diagram of the embodiments of the present application. Figure 2Further improvements have been made to the first detection unit Ⅰ and the second detection unit Ⅱ, providing more technical details. A first switching device is provided in the first detection unit Ⅰ. The output end of the first switching device is connected to the first power supply, and the control end of the first switching device is connected to the second power supply. An alarm control output end is provided between the output end of the first switching device and the first power supply. A second switching device is provided in the second detection unit Ⅱ. The output end of the second switching device is connected to the second power supply, and the control end of the second switching device is connected to the first power supply. An alarm control output end is provided between the output end of the second switching device and the second power supply. In the circuit principle block diagram of the embodiment of the present application, the first and second detection units respectively include switching devices, the first and second switching devices. The first and second switching devices are interrelated. The control ends and output ends of the two switching devices are respectively connected to different power supplies. An alarm control output end is provided between the output end of the switching device and the power supply, so as to realize the detection and alarm functions for the two power supplies. Through the detection and alarm functions, the redundant power supply system can quickly respond to power anomalies and take timely measures, such as switching to the standby power supply or shutting down the device, thereby improving the reliability and safety of the system, and is applicable to application scenarios with high requirements for power stability, preventing losses caused by power failures.

[0034] As Figure 3 and in combination with Figure 1 , 2 shown, Figure 3 Figure 11 shows the circuit schematic diagram of the embodiment of the present application. In Figure 3 , the first switching device is the first transistor Q1. The collector of the first transistor Q1 is the output end of the first switching device, the base of the first transistor Q1 is the control end of the first switching device, and the emitter of the first transistor Q1 is grounded. A first resistor R1 is connected between the collector of the first transistor Q1 and the first power supply 12V_1. The base of the first transistor Q1 is connected to the second power supply 12V_2 through a second resistor R2. A third resistor R3 is connected between the base and emitter of the first transistor Q1. The second and third resistors form a voltage dividing structure for the second power supply.

[0035] The second switching device is the second transistor Q2. The collector of the second transistor Q2 is the output end of the second switching device, the base of the second transistor Q2 is the control end of the second switching device. The collector of the second transistor Q2 is connected to the second power supply 12V_2 through a fourth resistor R4. The base of the second transistor Q2 is connected to the first power supply 12V_1 through a fifth resistor R5. A sixth resistor is connected between the base and emitter of the second transistor Q2. It further includes a second diode D2. The positive pole of the second diode D2 is connected between the fourth resistor R4 and the collector of the second transistor Q2, and the negative pole of the second diode D2 is connected to the alarm control output end Output.

[0036] As an alternative, the first detection units Ⅰ and Ⅱ can be further improved by replacing the transistors in the detection units with MOS transistors. For example:

[0037] The first switching device is the first MOS transistor. The drain of the first MOS transistor is the output terminal of the first switching device and is connected to the first power supply 12V_1. The gate of the first MOS transistor is the control terminal of the first switching device and is connected to the second power supply 12V_2 through the second resistor R2. The source of the first MOS transistor is grounded. A first resistor R1 is connected between the drain of the first MOS transistor and the first power supply 12V_1. The second and third resistors R2 and R3 form a voltage division structure for the second power supply 12V_2 and are connected between the gate and the source of the first MOS transistor. One end of the first capacitor C1 is connected between the second resistor R2 and the gate of the second MOS transistor, and the other end is connected to the source of the second MOS transistor. The positive electrode of the first diode D1 is connected between the first resistor R1 and the drain of the first MOS transistor, and the negative electrode is connected to the alarm control output terminal Output.

[0038] The second switching device is the second MOS transistor. The drain of the second MOS transistor is the output terminal of the second switching device and is connected to the second power supply 12V_2 through the fourth resistor R4. The gate of the second MOS transistor is the control terminal of the second switching device and is connected to the first power supply 12V_1 through the fifth resistor R5. The source of the second MOS transistor is grounded. A sixth resistor R6 is connected between the gate and the source of the second MOS transistor. The positive electrode of the second diode D2 is connected between the fourth resistor R4 and the drain of the second MOS transistor, and the negative electrode is connected to the alarm control output terminal Output.

[0039] Compared with transistors (bipolar transistors), using MOS transistors as switching devices can further reduce the on-resistance and improve the efficiency of the redundant power supply alarm circuit.

[0040] As a further extension and alternative, other switching devices can be selected in the first detection units Ⅰ and Ⅱ in the embodiments of the present application, such as: thyristors, insulated gate bipolar transistors (IGBTs), optocouplers, junction field effect transistors (JFETs), etc. Different switching devices have different electrical characteristics and application scenarios. Appropriate switching devices can be selected according to the requirements of different redundant alarm power supply circuits, and comprehensive considerations should be made in combination with factors such as voltage, current, frequency, switching speed, and device cost.

[0041] Figure 3The circuit schematic diagram shown is a specific implementation of the redundant power supply warning circuit, which is composed of two transistors (triodes), two diodes, and six resistors. Circuit principle description: Taking the first and second power supplies as 12V as an example, it is only to illustrate the basic connection relationship of the circuit. In actual application scenarios, it is not limited to 12V power supplies. In actual application scenarios, only the first and second circuits need to be input, and appropriate resistance values of the first resistor R1 and the fourth resistor R4 are selected so that the redundant power supply warning circuit has the ability to directly drive the buzzer and the LED light-emitting diode.

[0042] In the first detection unit Ⅰ, the second power supply 12V_2 controls the output of the first power supply 12V_1 at node A to detect whether the second power supply 12V_2 is normal. If there is an abnormality in the second power supply 12V_2, an alarm output is made through the alarm control output terminal Output at node A. When the second power supply 12V_2 is at a high level, node B obtains a 3.3V voltage through the voltage division structure formed by the second resistor R2 and the third resistor R3. After obtaining the high level, it drives the first transistor Q1 to conduct. After the first transistor Q1 conducts, the voltage of the first power supply 12V_1 at node A is clamped to the ground GND, and at this time, there is no output voltage at node A to node C.

[0043] When the second power supply 12V_2 is at a low level, node B is also at a low level, and the first transistor Q1 is turned off and does not conduct. At this time, the first power supply 12V_1 is at a high level at node A, and node A outputs a high level to node C. From the above circuit structure, it can be seen that when the second power supply 12V_2 fails and the power supply cannot output, the alarm signal can be output from node C to the alarm control output terminal Output through the turn-off of the first transistor Q1, realizing the alarm monitoring of the redundant power supply. It can be seen that in this scenario, the first power supply 12V_1 is used as the input of the detection power supply, and the second power supply 12V_2 is used as the power supply for the alarm output. If the first power supply 12V_1 is selected as the power supply for the alarm output, when the first power supply 12V_1 loses power, the second power supply 12V_2 cannot output an alarm signal to the alarm control output terminal Output, and the alarm monitoring of the redundant power supply cannot be realized.

[0044] In the second detection unit II, when the second power supply 12V_2 is at a high level, the node E is divided by the voltage-dividing structure formed by the fifth resistor R5 and the sixth resistor R6 to obtain 3.3V. The node E drives the second transistor Q2 to conduct through the high level. The voltage of the second power supply 12V_2 at the node D is clamped to the ground GND. Therefore, the node D does not output an alarm signal to the node C, and the alarm control output terminal Output does not output an alarm signal. When the second power supply 12V_2 is at a low level, the node E is also at a low level, the first transistor Q1 does not conduct, the first power supply 12V_1 is at a high level at the node D, the node D outputs a high level to the node C. At this time, the node C is at a high level, and the node C outputs an alarm signal to the alarm control output terminal Output, realizing the alarm monitoring of the redundant power supply. It can be seen that in this scenario, the second power supply 12V_2 is used as the input of the detection power supply, and the first power supply 12V_1 is used as the power supply for alarm output. When the first power supply 12V_1 loses power and fails, the second power supply 12V_2 is used as the input of the detection power supply to output an alarm signal to the alarm control output terminal Output, realizing the alarm monitoring of the redundant power supply.

[0045] The circuit structure provided by the above specific implementation manner is based on the redundant power supply alarm circuit as the basic circuit. On the premise of the basic circuit structure, improvements can be made to form power supply alarm circuits with more different circuit structures. Exemplarily:

[0046] Such as Figure 4 As shown, a first capacitor C1 with a suitable capacitance value can be added to the voltage-dividing structure of the second transistor Q2 to increase the stability of the detection circuit part in the second detection unit II. One end of the first capacitor C1 is connected between the second resistor R2 and the base of the second transistor Q2, and the other end of the first capacitor C1 is connected to the emitter of the second transistor Q2. The third resistor R3 is connected across both ends of the first capacitor C1. The second resistor R2 and the third resistor R3 form a voltage-dividing structure, and the ratio of the second resistor R2 and the third resistor R3 can be adjusted according to the value of the power supply to be detected, and the voltage at which the circuit to be detected is lower than a certain value can be set to turn on the switching device and send an alarm signal for alarm. Taking a 12V power supply as an example, if the turn-on voltage of the base of the second transistor Q2 is 0.7V, it is necessary to determine that the 12V power supply loses power to 10V and then turn on the alarm and send an alarm signal. The exemplary calculation process is as follows:

[0047] 10V / 0.7V = (R2 + R3) / R3...(1)

[0048] R2 / R3 = 113 / 17...(2)

[0049] In Formulas (1) and (2), the resistance value is at the 10K level, the second resistor R2 has a value of 22.6KΩ, and the third resistor R3 has a value of 3.4KΩ. The value of the first capacitor C1 is small and only serves to stabilize the detection circuit. By increasing the capacitance value of the first capacitor C1, a delay warning function can be achieved, and the delay time can be modified by coordinating the values of the first capacitor C1 and the third resistor R3.

[0050] In the above specific implementation, by adding the first capacitor C1 and reasonably configuring the resistance values of the second resistor R2 and the third resistor R3, a delay circuit structure is designed that can monitor the power supply voltage or trigger an alarm signal when the voltage drops to a preset threshold, and the delay warning function can be achieved by adjusting the capacitance value of the first capacitor C1, improving the reliability and safety of the detection unit. The first capacitor C1 and the third resistor R3 are reasonably configured, and appropriate values can be selected to set the delay time. The first capacitor C1 and the third resistor R3 can form a simple RC (resistor-capacitor) delay circuit, and the time constant τ is formed by the capacitance value of the first capacitor C1 and the resistance value of the third resistor R3, which determines the delay time τ of the RC delay circuit. In actual circuit design, it is first necessary to determine how long the delay time τ is before triggering the alarm signal to ensure that the performance of the delay circuit meets the requirements, which helps to avoid false alarms caused by short-term fluctuations in the power supply voltage and improve the stability and reliability of the detection unit.

[0051] As Figure 5 shown, in some specific implementations, a light-emitting diode LED1 is provided in the redundant power supply alarm circuit. One end of the light-emitting diode LED1 is connected to the alarm control output terminal Output, and the other end is connected to one end of the ninth resistor R9. The other end of the ninth resistor R9 is grounded. By providing a light-emitting diode LED1 in the redundant power supply alarm circuit, the alarm control output terminal Output realizes a visual alarm indication function. The light-emitting diode LED1 is connected to the ninth resistor R9, and the ninth resistor R9 can limit the current flowing through the light-emitting diode LED1 and play a role in overcurrent limiting to prevent the light-emitting diode LED1 from being damaged due to unexpected situations such as overcurrent and surge. By adding the light-emitting diode LED1 and the ninth resistor R9 that plays a role in current limiting, a visual alarm function for the redundant power supply is achieved, improving the visibility and maintenance convenience of the redundant power supply alarm circuit.

[0052] As Figure 6 shown, in Figure 6It includes a buzzer, a third transistor Q3, and a third diode D3. The base of the third transistor Q3 is connected to the alarm control output terminal Output. The collector of the third transistor Q3 is connected to one end of the buzzer. The other end of the buzzer is connected to one end of a seventh resistor R7. The other end of the seventh resistor R7 is connected to a 12V power supply. The positive electrode of the third diode D3 is connected between the buzzer and the third transistor Q3, and the negative electrode of the third diode D3 is connected between the buzzer and the seventh resistor R7. An eighth resistor R8 and a second capacitor C2 are connected across the base and emitter of the third transistor Q3.

[0053] Figure 6 The provided technical solution activates the buzzer through the third transistor Q3 to emit a sound alarm. The third transistor Q3 serves as a switching device. When the alarm control output terminal Output receives an alarm signal, the third transistor Q3 conducts, and the buzzer is activated to emit a sound, thereby realizing the alarm function. The third diode D3 serves as a reverse voltage protection component to prevent the devices in the circuit from damaging the third transistor Q3 due to surges, overcurrents, overvoltages, or back electromotive forces. For example, there is a possible situation: when the buzzer is turned off, a back electromotive force will be generated, and the back electromotive force will damage the third transistor Q3 and other circuit devices. Since the buzzer is an inductive load because it usually contains an electromagnetic coil, when current flows through the electromagnetic coil, a magnetic field will be generated, and the magnetic field will generate an induced electromotive force (back electromotive force) with the change of current. The direction of the back electromotive force is opposite to the original current direction and is used to resist the change of the original current. The magnetic field energy stored in the inductive device will be released with the back electromotive force, resulting in a voltage spike, damaging other devices in the circuit (such as the third transistor Q3), causing a large current impact on other devices in the circuit, and affecting the stability of the circuit. Therefore, connecting a third diode D3 in parallel at both ends of the buzzer can provide a safe way for the energy of the back electromotive force to be dissipated, protecting the safety of the third transistor Q3 and preventing it from being damaged.

[0054] The eighth resistor R8 and the second capacitor C2 are connected between the base and emitter of the third transistor Q3, forming an RC (resistor-capacitor) buffer / absorption circuit. Using the combination of the second capacitor C2 and the eighth resistor R8 to suppress voltage spikes and current impacts, limit the rate of change of current, improve the overall stability of the circuit, protect the third transistor Q3 or other possible integrated circuits, chips and other circuit devices, and improve the safety of inductive loads (such as buzzers) and switching devices (such as the first, second, and third transistors Q1, Q2, Q3).

[0055] On the basis of providing a redundant power supply warning circuit, the embodiment of the present application further provides a corresponding redundant power supply circuit. The redundant power supply circuit includes the redundant power supply warning circuit mentioned in any specific implementation manner in the embodiment of the present application. The redundant power supply circuit only needs to collect the output terminals of two power supplies as input signals to generate an audible and visual alarm. No matter which power supply has a voltage drop fault, an alarm message can be sent. Taking the first and second detection units I and II as an example, the node A in the first detection unit I and the node B in the second detection unit II are used as the outputs of two alarms, and are connected in parallel to the node C through the first diode D1 and the second diode D2 to ensure that the alarm outputs of each path do not interfere with each other. The first and second detection units I and II are only examples of various alarm circuits and detection units in the redundant power supply circuit. Those skilled in the art can expand it into a multi-path alarm circuit based on their actual needs on the basis of the first and second detection units I and II.

[0056] As an alternative implementation, if there are only two alarms, in this scenario, the circuit structures of the first and second detection units I and II can be simplified, and the first and second diodes D1 and D2 can be removed.

[0057] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered that the scope described in the specification of the embodiment of the present application is covered.

[0058] In the description of the specification of the embodiment of the present application, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one implementation manner or example of the embodiment of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0059] In addition, the technical solutions between various embodiments of the embodiment of the present application can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the embodiment of the present application.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, and are not intended to limit them. Although the embodiments of the present application have been described in detail with reference to the foregoing specific embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements on some or all of the technical features, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A redundant power supply alarm circuit, characterized in that It includes a first detection unit and a second detection unit, where: A first switching device is provided in the first detection unit. The output end of the first switching device is connected to a first power supply, the control end of the first switching device is connected to a second power supply, and an alarm control output end is provided between the output end of the first switching device and the first power supply; A second switching device is provided in the second detection unit. The output end of the second switching device is connected to the second power supply, the control end of the second switching device is connected to the first power supply, and the alarm control output end is provided between the output end of the second switching device and the second power supply.

2. The redundant power supply warning circuit according to claim 1, wherein The first switching device is a first transistor. The output end of the first switching device is the collector of the first transistor, the control end of the first switching device is the base of the first transistor, and the emitter of the first transistor is grounded.

3. The redundant power supply alarm circuit according to claim 2, wherein The collector of the first transistor is connected to the first power supply through a first resistor. The base of the first transistor is connected to the second power supply through a second resistor. A third resistor is connected between the base and the emitter of the first transistor. The second and third resistors form a voltage division structure for the second power supply.

4. The redundant power supply alarm circuit according to claim 3, wherein, It further includes a first capacitor. One end of the first capacitor is connected between the second resistor and the base of the second transistor, and the other end of the first capacitor is connected to the emitter of the second transistor.

5. The redundant power supply warning circuit according to claim 2, wherein It further includes a first diode. The positive pole of the first diode is connected between the first resistor and the collector of the first transistor, and the negative pole of the first diode is connected to the alarm control output end.

6. The redundant power supply warning circuit according to claim 1, wherein The second switching device is a second transistor. The output end of the second switching device is the collector of the second transistor, the control end of the second switching device is the base of the second transistor, and the emitter of the second transistor is grounded.

7. The redundant power supply alarm circuit according to claim 6, wherein The collector of the second transistor is connected to the second power supply through a fourth resistor. The base of the second transistor is connected to the first power supply through a fifth resistor. A sixth resistor is connected between the base and the emitter of the second transistor. It further includes a second diode. The positive pole of the second diode is connected between the fourth resistor and the collector of the second transistor, and the negative pole of the second diode is connected to the alarm control output end.

8. The redundant power supply alarm circuit according to claim 1, wherein, It further includes a light-emitting diode. One end of the light-emitting diode is connected to the alarm control output end, and the other end is connected to one end of a ninth resistor. The other end of the ninth resistor is grounded.

9. The redundant power supply alarm circuit according to claim 1, wherein, It further includes a buzzer, a third transistor and a third diode. The base of the third transistor is connected to the alarm control output end. The collector of the third transistor is connected to one end of the buzzer. The other end of the buzzer is connected to one end of a seventh resistor. The other end of the seventh resistor is connected to a power supply. The positive pole of the third diode is connected between the buzzer and the third transistor, and the negative pole of the third diode is connected between the buzzer and the seventh resistor. An eighth resistor and a second capacitor are connected in parallel between the base and the emitter of the third transistor.

10. A redundant power supply circuit, characterized in that, The redundant power supply warning circuit described in any one of claims 1 to 9 is provided in the redundant power supply circuit.

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