Power supply switching device and power supply system

Abstract

The embodiment of the present application provides a power switching device and a power supply system, which belongs to the field of power supply technology. The method includes: an output control terminal and a relay control circuit; wherein the relay control circuit includes: a switching module and an on-off control module; the switching module is electrically connected to the output control terminal, and the on-off control module is electrically connected to the switching module; the switching module is used to switch the connection state with the on-off control module according to a first control signal, so that the output control terminal is connected to a different power supply; the on-off control module is used to disconnect the connection between the power supply and the output control terminal according to a second control signal, and then connect the power supply and the output control terminal after the switching module is switched to a connection state. The embodiment of the present application can safely switch the power supply, thereby improving the safety and reliability of the circuit.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power supply switching device and a power supply system. Background Art

[0002] In a circuit with multiple power supplies, different power supplies are often selected by switching relays. Switching mechanical relays while energized can easily cause the mechanical relays to stick, resulting in circuit damage or equipment failure. In addition, when the power supply changes, the residual voltage in the circuit can cause a huge backflow current to instantly flow into the circuit, causing the power supply system to malfunction.

[0003] Therefore, how to prevent relay sticking and switch power safely has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The main purpose of the embodiments of the present application is to provide a power switching device and a power supply system, aiming to switch power safely.

[0005] To achieve the above object, a first aspect of an embodiment of the present application provides a power switching device, the method comprising:

[0006] Output control terminal and relay control circuit; wherein, the relay control circuit comprises: a switching module and an on-off control module;

[0007] The on-off control module is electrically connected to the switching module, and the switching module is electrically connected to the output control terminal;

[0008] The switching module is used to switch the connection state with the on-off control module according to the first control signal, so that the output control end is connected to different power supplies;

[0009] The on-off control module is used to first disconnect the connection between the power supply and the output control end according to a second control signal, and then connect the power supply and the output control end after the switching module is switched to a connection state.

[0010] In some embodiments, the apparatus further comprises:

[0011] Input control terminal;

[0012] An input reverse delay circuit, electrically connected to the input control terminal, for performing delayed reverse processing on the input signal of the input control terminal, and outputting a first delayed signal and a second delayed signal;

[0013] An input state detection circuit is electrically connected between the input reverse delay circuit and the relay control circuit, and is used to perform a first logic processing according to the first delay signal and the second delay signal to output a first control signal, and then perform a second logic processing according to the first delay signal and the second delay signal to output the second control signal.

[0014] In some embodiments, the input reverse delay circuit includes:

[0015] A first reverse delay module, electrically connected to the input control terminal, configured to perform reverse delay processing on the input signal of the input control terminal and output the first delayed signal;

[0016] The second reverse delay module is electrically connected to the first reverse delay module, and is used for performing reverse delay processing on the first delay signal and outputting the second delay signal.

[0017] In some embodiments, the input state detection circuit includes:

[0018] a first state detection module, electrically connected to the first reverse delay module, configured to perform the first logic processing according to the first delay signal and output the first control signal;

[0019] A second state detection module is electrically connected to the first reverse delay module, the second reverse delay module, the switching module, and the on-off control module, and is used to perform the second logic processing according to the first control signal, the first delay signal, and the second delay signal, and output the second control signal.

[0020] In some embodiments, the device further comprises a voltage-stabilizing power supply terminal, wherein the voltage-stabilizing power supply terminal is used to provide a preset voltage signal;

[0021] The first reverse delay module comprises:

[0022] A first resistor, a second resistor, a first capacitor, a first MOS tube and a first reverse delay output terminal;

[0023] The input control terminal is electrically connected to one end of the first resistor, the other end of the first resistor is electrically connected to one end of the first capacitor and the gate of the first MOS transistor, the other end of the first capacitor is grounded, the source of the first MOS transistor is grounded, the drain of the first MOS transistor is electrically connected to one end of the second resistor, and the other end of the second resistor is electrically connected to the regulated power supply terminal;

[0024] The first reverse delay output terminal is electrically connected between one end of the second resistor and the drain of the first MOS tube.

[0025] In some embodiments, the second reverse delay module includes:

[0026] A third resistor, a fourth resistor, a second capacitor, a second MOS tube, and a second reverse delay output terminal;

[0027] One end of the third resistor is electrically connected between one end of the second resistor and the drain of the first MOS tube, the other end of the third resistor is electrically connected to one end of the second capacitor and the gate of the second MOS tube, the other end of the second capacitor is grounded, the source of the second MOS tube is grounded, the drain of the second MOS tube is electrically connected to one end of the fourth resistor, and the other end of the fourth resistor is electrically connected to the regulated power supply end;

[0028] The second reverse delay output terminal is electrically connected between one end of the fourth resistor and the drain of the second MOS tube.

[0029] In some embodiments, the first state detection module includes: a first NOT gate and a first state detection output terminal;

[0030] The second state detection module includes: a first NAND gate, a second NAND gate, a third NAND gate, a second NOT gate, a third NOT gate and a second state detection output terminal;

[0031] The input end of the first NAND gate is electrically connected to the first reverse delay output end and the second reverse delay output end, and the output end of the first NAND gate is electrically connected to the first input end of the third NAND gate;

[0032] The input end of the first NOT gate is electrically connected to the first reverse delay output end, the input end of the second NOT gate is electrically connected to the second reverse delay output end, the output end of the first NOT gate and the output end of the second NOT gate are electrically connected to the input end of the second NAND gate, and the output end of the second NAND gate is electrically connected to the second input end of the third NAND gate;

[0033] The output end of the third NAND gate is electrically connected to the input end of the third NOT gate, and the output end of the third NOT gate is electrically connected to the second state detection output end;

[0034] The output end of the second NOT gate and the input end of the second NAND gate are electrically connected to the first state detection output end.

[0035] In some embodiments, the on-off control module includes: a first relay, a second relay, a fifth resistor and a third MOS tube;

[0036] The first relay is electrically connected to the second relay and one end of the fifth resistor, the other end of the fifth resistor is electrically connected to the voltage-stabilized power supply end, the second relay is electrically connected to the drain of the third MOS tube, the source of the third MOS tube is grounded, and the gate of the third MOS tube is electrically connected to the second state detection output end.

[0037] In some embodiments, the switching module includes: a third relay, a sixth resistor, a third capacitor and a fourth MOS tube;

[0038] One end of the sixth resistor is electrically connected to the first state detection output end, the other end of the sixth resistor is electrically connected to one end of the third capacitor and the gate of the fourth MOS tube, the other end of the third capacitor is grounded, the source of the fourth MOS tube is grounded, and the third relay is electrically connected to the drain of the fourth MOS tube, the first relay, the second relay and the output control end.

[0039] To achieve the above object, a second aspect of an embodiment of the present application provides a power supply system, including:

[0040] The power switching device as described in the first aspect above;

[0041] A plurality of power supplies, wherein the plurality of power supplies are electrically connected to the power switching device;

[0042] A load is electrically connected to the output control terminal of the power switching device.

[0043] In the power switching device and power supply system shown in the embodiment of the present application, if the mechanical relay is used to switch the power supply in the energized state, the retained voltage in the circuit is likely to cause excessive current, causing the mechanical relay to stick and unable to be normally disconnected or closed. The power switching device and power supply system proposed in the present application first disconnect the power supply from the switching module through the on-off control module according to the second control signal until the voltage on the circuit returns to zero, and then disconnect the currently closed contact of the relay in the switching module according to the first control signal and connect another contact, so that when the voltage of the relay contact is zero, the switching module is controlled to switch the connection state with the on-off control module. After the switching module completes the power switching, the on-off control module is closed again to connect the output control end to a different power supply. Since there is no residual voltage when the relay of the switching module is disconnected, the instantaneous current flowing through the relay in the on-off control module of the embodiment of the present application is too large, thereby causing the relay to stick, and also reducing the circuit damage caused by excessive current when switching the power supply. The embodiment of the present application realizes safe power switching and improves the safety and reliability of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a module block diagram of a power switching device provided in an embodiment of the present application;

[0045] Figure 2 is a module block diagram of a power switching device provided by another embodiment of the present application;

[0046] Figure 3 yes Figure 2 The module block diagram of the input reverse delay circuit;

[0047] Figure 4 yes Figure 2 Module block diagram of the input state detection circuit;

[0048] Figure 5 yes Figure 3 The circuit schematic diagram of the first reverse delay module;

[0049] Figure 6 yes Figure 3 A circuit schematic diagram of the first reverse delay module and the second reverse delay module;

[0050] Figure 7 yes Figure 4 A circuit schematic diagram of a first state detection module and a second state detection module;

[0051] Figure 8 yes Figure 1 Circuit diagram of the on-off control module;

[0052] Fig. 9 yes Figure 1 The circuit schematic diagram of the on-off control module and the switching module;

[0053] Fig.10 is a signal timing diagram of an application example provided by an embodiment of the present application;

[0054] Fig.11 It is a module block diagram of the power supply system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0056] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0058] First, some nouns involved in this application are analyzed:

[0059] Relay sticking: refers to the melting and welding of the fixed contacts and movable contacts of the relay, which makes it impossible to control the opening or closing normally. Excessive load current can easily cause the relay to stick.

[0060] Delay circuit: In order to make the controlled object work within a certain period of time or to make the next operation instruction issued at the appropriate time, a delay circuit is often used. When the input signal reaches the delay circuit, the input signal is stored by the capacitor, and the capacitor begins to accumulate charge. After the capacitor is charged to a certain degree, the output signal will be triggered and sent to the next circuit.

[0061] The power switching device and power supply system provided in the embodiments of the present application are specifically described through the following embodiments. First, the power switching device in the embodiments of the present application is described.

[0062] The power switching device provided in the embodiment of the present application can be applied to a terminal, can also be applied to a server side, and can also be software running in a terminal or a server side. In some embodiments, the terminal can be a smart phone, a tablet computer, a laptop computer, a desktop computer, etc.; the server side can be configured as an independent physical server, or a server cluster or a distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms; the software can be an application that implements the power switching device, etc., but is not limited to the above forms.

[0063] The present application can be used in many general or special computer system environments or configurations. For example: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments including any of the above systems or devices, etc. The present application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application can also be practiced in distributed computing environments, in which tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules can be located in local and remote computer storage media including storage devices.

[0064] See also Figure 1 In some embodiments, the power switching device includes an output control terminal POUT and a relay control circuit 100. The relay control circuit 100 includes a switching module 110 and an on-off control module 120. The on-off control module 120 is electrically connected to the switching module 110, and the switching module 110 is electrically connected to the output control terminal POUT.

[0065] The switching module 110 is used to switch the connection state with the on-off control module 120 according to the first control signal, so that the output control terminal POUT is connected to different power sources.

[0066] The on-off control module 120 is used to first disconnect the power supply and the output control terminal POUT according to the second control signal, and then connect the power supply and the output control terminal POUT after the switching module 110 is switched to the connection state.

[0067] In this embodiment, the switching module 110 uses a relay, and other embodiments do not limit the specific components of the switching module 110.

[0068] The beneficial effects of the embodiments of the present application include but are not limited to:

[0069] First, according to the second control signal, the power supply is disconnected from the switching module 110 through the on-off control module 120 until the voltage on the relay contact of the switching module 110 returns to zero, and then according to the first control signal, the currently closed contact of the relay in the switching module 110 is disconnected and another contact is connected, so that when the voltage of the relay contact is zero, the switching module 110 is controlled to switch the connection state with the on-off control module 120. After the switching module 110 completes the power switching, the on-off control module 120 is closed again to connect the output control terminal POUT to a different power supply. Since there is no residual voltage when the relay of the switching module is disconnected, the embodiment of the present application reduces the risk of excessive instantaneous current flowing through the relay in the on-off control module 120, thereby causing the relay to stick, or excessive current when switching the power supply, causing circuit damage. The embodiment of the present application realizes safe power switching and improves the safety and reliability of the circuit.

[0070] See also Figure 2 In some embodiments, the power switching device further includes an input control terminal PIN, an input reverse delay circuit 200 , and an input state detection circuit 300 .

[0071] The input reverse delay circuit 200 is electrically connected to the input control terminal PIN. The input reverse delay circuit 200 is used to delay and reversely process the input signal of the input control terminal PIN, and output a first delayed signal and a second delayed signal;

[0072] The input state detection circuit 300 is electrically connected between the input reverse delay circuit 200 and the relay control circuit 100. The input state detection circuit 300 is used to perform a first logic processing according to the first delay signal and the second delay signal to output a first control signal, and then perform a second logic processing according to the first delay signal and the second delay signal to output a second control signal.

[0073] It should be noted that performing reverse delay processing on a signal means inverting the signal and then delaying it.

[0074] The advantage of this embodiment is that after obtaining the input signal from the input control terminal PIN, according to a single signal, the first control signal and the second control signal that change with time are automatically generated through the operation of inverting and delaying the signal of the input reverse delay circuit 200 and the operation of the logic processing of the input state detection circuit 300 to control the multiple state changes of the switching module 110 and the on-off control module 120. This ensures that the switching module 110 performs the switching operation only after the on-off control module 120 is disconnected and the relay contact voltage is zero. Moreover, the on-off control module 120 is closed only after the switching module 110 completes the power switching, thereby connecting the output control terminal POUT to different power supplies. The embodiment of the present application makes the control of the relay more convenient and improves the safety and reliability of the circuit.

[0075] See also Figure 2 and Figure 3 In some embodiments, the input reverse delay circuit 200 includes:

[0076] The first reverse delay module 210 is electrically connected to the input control terminal PIN and is used to perform reverse delay processing on the input signal of the input control terminal PIN and output a first delayed signal;

[0077] The second reverse delay module 220 is electrically connected to the first reverse delay module 210, and is used to perform reverse delay processing on the first delayed signal and output a second delayed signal.

[0078] It should be noted that

[0079] The advantage of this embodiment is that after obtaining the input signal from the input control terminal PIN, the first delay signal is output through the first reverse delay module 210, and the second delay signal is output through the second reverse delay module 220. Then, according to the first delay signal and the second delay signal, the control signal that changes with time is output through the input state detection circuit 300 to control the various state changes of the switching module 110 and the on-off control module 120. This ensures that the switching module 110 performs the switching operation only after the on-off control module 120 is disconnected and the relay contact voltage is zero. Moreover, the on-off control module 120 is closed only after the switching module 110 completes the power switching, thereby connecting the output control terminal POUT to different power supplies. The embodiment of the present application makes the control of the relay more convenient and improves the safety and reliability of the circuit.

[0080] See also Figure 4 In some embodiments, the input state detection circuit 300 includes:

[0081] The first state detection module 310 is electrically connected to the first reverse delay module 210 and is used to perform a first logic process according to the first delay signal and output a first control signal;

[0082] The second state detection module 320 is electrically connected to the first reverse delay module 210, the second reverse delay module 220, the switching module 110, and the on-off control module 120, and is used to perform a second logic processing according to the first control signal, the first delay signal, and the second delay signal, and output a second control signal.

[0083] The advantage of this embodiment is that after obtaining the first delay signal from the first reverse delay module 210 and the second delay signal from the second reverse delay module 220, the first control signal is output through the first state detection module 310, the second control signal is output through the second state detection module 320, and the various state changes of the switching module 110 and the on-off control module 120 are controlled according to the first control signal and the second control signal. This ensures that the switching module 110 performs the switching operation only after the on-off control module 120 is disconnected and the relay contact voltage is zero. Moreover, the on-off control module 120 is closed only after the switching module 110 completes the power switching, thereby connecting the output control terminal POUT to different power supplies. The embodiment of the present application makes the control of the relay more convenient and improves the safety and reliability of the circuit.

[0084] See also Figure 3 and Figure 5 In some embodiments, the power switching device further includes a voltage-stabilized power supply terminal VB, and the voltage-stabilized power supply terminal VB is used to provide a preset voltage signal;

[0085] The first reverse delay module 210 includes: a first resistor R1, a second resistor R2, a first capacitor C1, a first MOS transistor M1 and a first reverse delay output terminal YF.

[0086] The input control terminal PI N is electrically connected to one end of the first resistor R1, the other end of the first resistor R1 is electrically connected to one end of the first capacitor C1 and the gate of the first MOS tube M1, the other end of the first capacitor C1 is grounded, the source of the first MOS tube M1 is grounded, the drain of the first MOS tube M1 is electrically connected to one end of the second resistor R2, and the other end of the second resistor R2 is electrically connected to the voltage-stabilized power supply terminal VB. The first reverse delay output terminal YF is electrically connected between one end of the second resistor R2 and the drain of the first MOS tube M1.

[0087] It should be noted that the first delayed signal is a signal output by the first reverse delayed output terminal YF.

[0088] Specifically, the preset voltage signal provided by the voltage-stabilized power supply terminal VB may be +5V.

[0089] Specifically, the ground refers to a digital ground DGND.

[0090] The advantage of this embodiment is that the embodiment of the present application performs reverse delay processing on the input signal of the input control terminal PIN through the first reverse delay module 210 composed of the first resistor R1, the second resistor R2, the first capacitor C1, the first MOS tube M1 and the first reverse delay output terminal YF, outputs the first delay signal from the first reverse delay output terminal YF, and controls the on and off of the relay according to the control signal obtained after the delay signal is processed, so that the control of the relay is more convenient and the safety and reliability of the circuit are improved.

[0091] See also Figure 3 and Figure 6 In some embodiments, the second reverse delay module 220 includes:

[0092] a third resistor R3, a fourth resistor R4, a second capacitor C2, a second MOS transistor M2 and a second reverse delay output terminal Y.

[0093] One end of the third resistor R3 is electrically connected between one end of the second resistor R2 and the drain of the first MOS tube M1, the other end of the third resistor R3 is electrically connected to one end of the second capacitor C2 and the gate of the second MOS tube M2, the other end of the second capacitor C2 is grounded, the source of the second MOS tube M2 is grounded, the drain of the second MOS tube M2 is electrically connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is electrically connected to the voltage-stabilized power supply terminal VB. One end of the fourth resistor R4 is electrically connected to the second reverse delay output terminal Y between the drain of the second MOS tube M2 and the drain of the second MOS tube M2.

[0094] It should be noted that the second delayed signal is a signal output by the second reverse delayed output terminal Y.

[0095] The advantage of this embodiment is that the embodiment of the present application performs reverse delay processing on the input signal of the input control terminal PIN through the second reverse delay module 220 composed of the third resistor R3, the fourth resistor R4, the second capacitor C2, the second MOS tube M2 and the second reverse delay output terminal Y, outputs the second delay signal from the second reverse delay output terminal Y, and controls the on and off of the relay according to the control signal obtained after the delay signal is processed, so that the control of the relay is more convenient and the safety and reliability of the circuit are improved.

[0096] See also Figure 4 and Figure 7 In some embodiments, the first state detection module 310 includes: a first NOT gate NOT1 and a first state detection output terminal Q. The second state detection module 320 includes: a first NAND gate NAND1, a second NAND gate NAND2, a third NAND gate NAND3, a second NOT gate NOT2, a third NOT gate NOT3 and a second state detection output terminal HOLD.

[0097] The input end of the first NAND gate NAND1 is electrically connected to the first reverse delay output end YF and the second reverse delay output end Y, and the output end of the first NAND gate NAND1 is electrically connected to the first input end of the third NAND gate NAND3. The input end of the first NOT gate NOT1 is electrically connected to the first reverse delay output end YF, the input end of the second NOT gate NOT2 is electrically connected to the second reverse delay output end Y, the output end of the first NOT gate NOT1 and the output end of the second NOT gate NOT2 are electrically connected to the input end of the second NAND gate NAND2, and the output end of the second NAND gate NAND2 is electrically connected to the second input end of the third NAND gate NAND3. The output end of the third NAND gate NAND3 is electrically connected to the input end of the third NOT gate NOT3, and the output end of the third NOT gate NOT3 is electrically connected to the second state detection output end HOLD.

[0098] The first state detection output terminal Q is electrically connected between the output terminal of the second NOT gate NOT2 and the input terminal of the second NAND gate NAND2.

[0099] It should be noted that the first control signal is a signal output by the first state detection output terminal Q, and the second control signal is a signal output by the second state detection output terminal HOLD.

[0100] Specifically, if the first delay signal and the second delay signal are both low level, or the first delay signal and the second delay signal are both high level, the second control signal is low level. If the levels of the first delay signal and the second delay signal are inconsistent, the second control signal is high level.

[0101] The advantage of this embodiment is that after obtaining the first delay signal from the first reverse delay module 210 and the second delay signal from the second reverse delay module 220, the first control signal is output through the first state detection module 310 composed of the first NOT gate NOT1 and the first state detection output terminal Q, and the second control signal is output through the second state detection module 320 composed of the first NAND gate NAND1, the second NAND gate NAND2, the third NAND gate NAND3, the second NOT gate NOT2, the third NOT gate NOT3 and the second state detection output terminal HOLD, and the switching module 110 and the on-off control module 120 are controlled according to the first control signal and the second control signal. The multiple state changes. This ensures that the switching module 110 performs the switching operation only after the on-off control module 120 is disconnected and the relay contact voltage is zero. Moreover, the on-off control module 120 is closed only after the switching module 110 completes the power switching, thereby connecting the output control terminal POUT to different power supplies. The embodiment of the present application makes the control of the relay more convenient and improves the safety and reliability of the circuit.

[0102] See also Figure 1 and Figure 8In some embodiments, the on-off control module 120 includes: a first relay K1, a second relay K2, a fifth resistor R5 and a third MOS tube M3.

[0103] The first relay K1 is electrically connected to the second relay K2 and one end of the fifth resistor R5, the other end of the fifth resistor R5 is electrically connected to the voltage-stabilized power supply terminal VB, the second relay K2 is electrically connected to the drain of the third MOS tube M3, the source of the third MOS tube M3 is grounded, and the gate of the third MOS tube M3 is electrically connected to the second state detection output terminal HOLD.

[0104] It should be noted that the first relay K1 is electrically connected to the power input terminal VCC_A_I N, and is used to connect one of the multiple power supplies. The second relay K2 is electrically connected to another power input terminal VCC_B_I N, and is used to connect another of the multiple power supplies.

[0105] Specifically, the first relay K1 and the second relay K2 are optical coupling relays.

[0106] The advantage of this embodiment is that, according to the second control signal, before the switching module 110 performs the switching operation, the switching module 110 is disconnected from the power supply through the on-off control module 120 composed of the first relay K1, the second relay K2, the fifth resistor R5 and the third MOS tube M3, and the switching module 110 is switched after ensuring that the relay contact voltage of the switching module 110 is zero, thereby reducing the risk of excessive instantaneous current flowing through the third relay K3 when switching the power supply, thereby causing the third relay K3 to stick, or excessive current when switching the power supply, causing circuit damage. Moreover, after the switching module 110 completes the power switching, the on-off control module 120 is closed, thereby connecting the output control terminal POUT to different power supplies. The embodiment of the present application realizes safe power switching and improves the safety and reliability of the circuit.

[0107] See also Figure 1 and Fig. 9 In some embodiments, the switching module 110 includes: a third relay K3, a sixth resistor R6, a third capacitor C3 and a fourth MOS tube M4.

[0108] One end of the sixth resistor R6 is electrically connected to the first state detection output terminal Q, the other end of the sixth resistor R6 is electrically connected to one end of the third capacitor C3 and the gate of the fourth MOS tube M4, the other end of the third capacitor C3 is grounded, the source of the fourth MOS tube M4 is grounded, and the third relay K3 is electrically connected to the drain of the fourth MOS tube M4, the first relay K1, the second relay K2 and the output control terminal POUT.

[0109] Specifically, the third relay K3 is a double-pole single-throw relay, and the third relay K3 includes a first moving contact, a second moving contact, a static contact and a coil. The first moving contact is electrically connected to the first relay K1, the second moving contact is electrically connected to the second relay K2, and the static contact is electrically connected to the output control terminal POUT. One end of the coil is electrically connected to the drain of the fourth MOS tube M4, and the other end of the coil is electrically connected to the voltage-stabilized power supply terminal VB.

[0110] For example, in the initial state, the first relay K1 is closed, the second relay K2 is disconnected, and the third relay K3 is connected to the first relay K1 and disconnected from the second relay K2. After receiving the first control signal and the second control signal, the first relay K1 is disconnected according to the second control signal, so that the circuit between the output control terminal POUT and the power input terminal VCC_A_I N is disconnected. After the voltage on the contact of the third relay K3 returns to zero, the switch of the third relay K3 is switched according to the first control signal, so that the third relay K3 is connected to the second relay K2 and disconnected from the first relay K1. Finally, the second relay K2 is closed according to the second control signal, so that the circuit between the output control terminal POUT and another power input terminal VCC_B_I N is turned on, thereby completing the switching of the power supply.

[0111] The advantage of this embodiment is that the switching module 110 is composed of the third relay K3, the sixth resistor R6, the third capacitor C3 and the fourth MOS tube M4. According to the first control signal, the third relay K3 is switched only after the on-off control module 120 and the switching module 110 are disconnected and the contact voltage of the third relay K3 is ensured to be zero, thereby reducing the risk of excessive instantaneous current flowing through the third relay K3 in the switching module 110 when switching the power supply, thereby causing the third relay K3 to stick, or excessive current when switching the power supply, causing circuit damage. The embodiment of the present application realizes safe power switching and improves the safety and reliability of the circuit.

[0112] See also Figures 2 to 10 In an application example, the timing relationship of the signal is as follows Fig.10 As shown, S_PIN refers to the input signal input from the input control terminal PIN, S_Q refers to the first control signal output from the first state detection output terminal Q, S_HOLD refers to the second control signal output from the second state detection output terminal HOLD, and S_POUT refers to the voltage signal output from the output control terminal POUT.

[0113] In an application example, the initial state of the input signal is low level, the initial state of the first delay signal is high level, the initial state of the second delay signal is low level, the initial state of the first control signal is low level, and the initial state of the second control signal is high level. The input signal changes from low level to high level, and after the first delay time T1, the first delay signal output by the first reverse delay output terminal YF changes from high level to low level. Since the first delay signal and the second delay signal are both low level at this time, the second control signal output by the second state detection output terminal HOLD changes from high level to low level, so that the first relay K1 and the second relay K2 are disconnected, and the first control signal changes from low level to high level after a period of delay, so that the third relay K3 is switched. The second delay signal changes from low level to high level after the second delay time T2. Since the levels of the first delay signal and the second delay signal are inconsistent, the second control signal output by the second state detection output terminal HOLD changes from low level to high level, so that the first relay K1 and the second relay K2 are connected, thereby connecting the output control terminal POUT to different power supplies.

[0114] Specifically, the first delay time T1 is numerically equal to the resistance of the first resistor R1 multiplied by the capacitance of the first capacitor C1, and the second delay time T2 is numerically equal to the resistance of the third resistor R3 multiplied by the capacitance of the second capacitor C2.

[0115] See also Fig.11 An embodiment of the present application also provides a power supply system, including the above-mentioned power switching device, multiple power supplies, and a load.

[0116] A plurality of power sources are electrically connected to the power switching device, and a load is electrically connected to an output control terminal POUT of the power switching device.

[0117] The specific implementation of the power switching device in the power supply system is basically the same as the specific embodiment of the power switching device mentioned above, and will not be repeated here.

[0118] The power switching device and power supply system provided in the embodiments of the present application switch multiple power supplies through the power switching device, reducing the risk of excessive instantaneous current flowing through the relay when switching the power supply, thereby causing relay adhesion or circuit damage, achieving safe switching of power supplies, and improving the safety and reliability of the power supply system.

[0119] The embodiments described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0120] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0121] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0122] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0123] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0124] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0125] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. The mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0126] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0127] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A power switching device, characterized in that: The device comprises: Output control terminal and relay control circuit; wherein, the relay control circuit comprises: a switching module and an on-off control module; The switching module is electrically connected to the output control terminal, and the on-off control module is electrically connected to the switching module; The switching module is used to switch the connection state with the on-off control module according to the first control signal, so that the output control end is connected to different power supplies; The on-off control module is used to disconnect the connection between the power supply and the output control end according to the second control signal, and then connect the power supply and the output control end after the switching module is switched to the connection state; The device also includes: Input control terminal; An input reverse delay circuit, electrically connected to the input control terminal, for performing delayed reverse processing on the input signal of the input control terminal, and outputting a first delayed signal and a second delayed signal; An input state detection circuit, electrically connected between the input reverse delay circuit and the relay control circuit, configured to perform a first logic processing according to the first delay signal and the second delay signal to output a first control signal, and then perform a second logic processing according to the first delay signal and the second delay signal to output a second control signal; The input reverse delay circuit comprises: A first reverse delay module, electrically connected to the input control terminal, for performing reverse delay processing on the input signal of the input control terminal and outputting the first delayed signal; a second reverse delay module, electrically connected to the first reverse delay module, and configured to perform reverse delay processing on the first delay signal and output the second delay signal; The input state detection circuit comprises: a first state detection module, electrically connected to the first reverse delay module, configured to perform the first logic processing according to the first delay signal and output the first control signal; A second state detection module is electrically connected to the first reverse delay module, the second reverse delay module, the switching module, and the on-off control module, and is used to perform the second logic processing according to the first control signal, the first delay signal, and the second delay signal, and output the second control signal.

2. The power switching device according to claim 1, characterized in that: The device also includes a voltage-stabilized power supply terminal, which is used to provide a preset voltage signal; The first reverse delay module comprises: A first resistor, a second resistor, a first capacitor, a first MOS tube and a first reverse delay output terminal; The input control terminal is electrically connected to one end of the first resistor, the other end of the first resistor is electrically connected to one end of the first capacitor and the gate of the first MOS transistor, the other end of the first capacitor is grounded, the source of the first MOS transistor is grounded, the drain of the first MOS transistor is electrically connected to one end of the second resistor, and the other end of the second resistor is electrically connected to the regulated power supply terminal; The first reverse delay output terminal is electrically connected between one end of the second resistor and the drain of the first MOS tube.

3. The power switching device according to claim 2, characterized in that: The second reverse delay module comprises: A third resistor, a fourth resistor, a second capacitor, a second MOS tube, and a second reverse delay output terminal; One end of the third resistor is electrically connected between one end of the second resistor and the drain of the first MOS tube, the other end of the third resistor is electrically connected to one end of the second capacitor and the gate of the second MOS tube, the other end of the second capacitor is grounded, the source of the second MOS tube is grounded, the drain of the second MOS tube is electrically connected to one end of the fourth resistor, and the other end of the fourth resistor is electrically connected to the regulated power supply end; The second reverse delay output terminal is electrically connected between one end of the fourth resistor and the drain of the second MOS tube.

4. The power switching device according to claim 3, characterized in that: The first state detection module includes: a first NOT gate and a first state detection output terminal; The second state detection module includes: a first NAND gate, a second NAND gate, a third NAND gate, a second NOT gate, a third NOT gate and a second state detection output terminal; The input end of the first NAND gate is electrically connected to the first reverse delay output end and the second reverse delay output end, and the output end of the first NAND gate is electrically connected to the first input end of the third NAND gate; The input end of the first NOT gate is electrically connected to the first reverse delay output end, the input end of the second NOT gate is electrically connected to the second reverse delay output end, the output end of the first NOT gate and the output end of the second NOT gate are electrically connected to the input end of the second NAND gate, and the output end of the second NAND gate is electrically connected to the second input end of the third NAND gate; The output end of the third NAND gate is electrically connected to the input end of the third NOT gate, and the output end of the third NOT gate is electrically connected to the second state detection output end; The output end of the second NOT gate and the input end of the second NAND gate are electrically connected to the first state detection output end.

5. The power switching device according to claim 4, characterized in that: The on-off control module includes: a first relay, a second relay, a fifth resistor and a third MOS tube; The first relay is electrically connected to the second relay and one end of the fifth resistor, the other end of the fifth resistor is electrically connected to the voltage-stabilized power supply end, the second relay is electrically connected to the drain of the third MOS tube, the source of the third MOS tube is grounded, and the gate of the third MOS tube is electrically connected to the second state detection output end.

6. The power switching device according to claim 5, characterized in that: The switching module includes: a third relay, a sixth resistor, a third capacitor and a fourth MOS tube; One end of the sixth resistor is electrically connected to the first state detection output end, the other end of the sixth resistor is electrically connected to one end of the third capacitor and the gate of the fourth MOS tube, the other end of the third capacitor is grounded, the source of the fourth MOS tube is grounded, and the third relay is electrically connected to the drain of the fourth MOS tube, the first relay, the second relay and the output control end.

7. A power supply system, characterized in that: include: The power switching device according to any one of claims 1 to 6; A plurality of power supplies, wherein the plurality of power supplies are electrically connected to the power switching device; A load is electrically connected to the output control terminal of the power switching device.

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