Multiple power supply interlock circuit

Abstract

The utility model provides a kind of multiway power supply interlock circuit, including multiple power supply circuits, each power supply circuit includes: power supply interface, switching device, power supply detection circuit and isolation driving circuit;Power supply interface connects the first end of switching device and the detection end of power supply detection circuit, the second end of switching device is connected load, controlled end connects the output end of isolation driving circuit;Isolation driving circuit connects the output end of power supply detection circuit in other power supply circuits;Power supply interface is used for accessing voltage;Power supply detection circuit is used for under the condition that voltage is accessed in power supply interface, output power supply signal;Isolation driving circuit is used for under the condition that power supply signal is received, control the switching device shutdown in the power supply circuit where it is located.

Description

Technical Field

[0001] This utility model relates to the field of electronic power supply technology, and in particular to a multi-channel power supply interlock circuit. Background Technology

[0002] As technological products become increasingly feature-rich, the number of POWER interfaces is also constantly increasing, providing users with more choices and convenience. However, this diversification of interfaces also raises the issue of internal interface switching within products. Ensuring the safety between multiple interfaces and preventing voltage crosstalk has become a problem that needs to be solved. Utility Model Content

[0003] The main purpose of this invention is to provide a multi-channel power supply interlock circuit, which aims to ensure the safety between multiple interfaces and avoid voltage crosstalk.

[0004] To achieve the above objectives, this utility model proposes a multi-channel power supply interlock circuit, which includes:

[0005] Multiple power supply circuits, each of which includes: a power supply interface, a switching device, a power supply detection circuit, and an isolation drive circuit;

[0006] The power supply interface connects the first terminal of the switching device and the detection terminal of the power supply detection circuit; the second terminal of the switching device is connected to the load; and the controlled terminal is connected to the output terminal of the isolation drive circuit. The isolation drive circuit is connected to the output terminal of the power supply detection circuit in other power supply circuits.

[0007] The power supply interface is used to connect to voltage;

[0008] The power supply detection circuit is used to output a power supply signal when a voltage is applied to the power supply interface.

[0009] The isolation drive circuit is used to receive the output signal of the power supply detection circuit in other power supply circuits, and, upon receiving the power supply signal, control the switching device in the power supply circuit to turn off. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of an embodiment of the multi-channel power supply interlock circuit of this utility model;

[0012] Figure 2 This is a schematic diagram of the structure of two embodiments of the multi-channel power supply interlock circuit of this utility model;

[0013] Figure 3 This is a schematic diagram of the structure of four embodiments of the multi-channel power supply interlock circuit of this utility model;

[0014] Figure 4 This is a schematic diagram of the structure of five embodiments of the multi-channel power supply interlock circuit of this utility model;

[0015] Figure 5 This is a schematic diagram of the structure of six embodiments of the multi-channel power supply interlock circuit of this utility model;

[0016] Figure 6 This is a schematic diagram of the first structure of seven embodiments of the multi-channel power supply interlock circuit of this utility model;

[0017] Figure 7 This is a second structural schematic diagram of the seven embodiments of the multi-channel power supply interlock circuit of this utility model;

[0018] Figure 8 This is a schematic diagram of the third structure of the seven embodiments of the multi-channel power supply interlock circuit of this utility model;

[0019] Figure 9 This is a schematic diagram of the fourth structure of the seven embodiments of the multi-channel power supply interlock circuit of this utility model;

[0020] Figure 10 This is a fifth structural schematic diagram of the seven embodiments of the multi-channel power supply interlock circuit of this utility model;

[0021] Figure 11 This is a schematic diagram of eight embodiments of the multi-channel power supply interlock circuit of this utility model.

[0022] Explanation of icon numbers:

[0023]

[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0029] This utility model proposes a multi-channel power supply interlock circuit. In the first embodiment, the multi-channel power supply interlock circuit includes:

[0030] Multiple power supply circuits 10, each of which includes: a power supply interface 110, a switching device 120, a power supply detection circuit 130, and an isolation drive circuit 140;

[0031] The power supply interface 110 connects the first end of the switching device 120 and the detection end of the power supply detection circuit 130. The second end of the switching device 120 is connected to the load, and the controlled end is connected to the output end of the isolation drive circuit 140. The isolation drive circuit 140 is connected to the output end of the power supply detection circuit 130 in other power supply circuits 10.

[0032] The power supply interface 110 is used to connect to voltage;

[0033] The power supply detection circuit 130 is used to output a power supply signal when the power supply interface 110 is connected to a voltage.

[0034] The isolation drive circuit 140 is used to receive the output signal of the power supply detection circuit 130 in other power supply circuits 10, and, upon receiving the power supply signal, control the switching device 120 in the power supply circuit 10 to turn off.

[0035] Reference Figure 1In this embodiment, the multi-power supply interlock circuit includes multiple power supply circuits 10. These multiple power supply circuits 10 provide a path for voltage values ​​to the load. It is easy to understand that, since they provide voltage to the same load, the voltage amplitude connected to each power supply circuit 10 can be equal. It should be noted that the multiple power supply circuits 10 receive voltage through power supply interfaces 110. The power supply interfaces 110 connect to external power supply modules to obtain and receive the voltage provided by those modules. The power supply modules connected to the power supply interfaces 110 in each power supply circuit 10 are different, and these modules are used to provide voltage. Correspondingly, the type of the power supply interfaces 110 in different power supply circuits 10 is related to the type of power supply module connected to that interface. For example, assuming there are two power supply circuits 10, the first power supply interface 110 in the first power supply circuit 10 is a TYPE-C plug, and the power supply module corresponding to the first power supply circuit 10 uses a TYPE-C socket to output voltage. The second power supply interface 110 in the second power supply circuit 10 is a hot shoe, connected to the corresponding power supply module through contacts on the hot shoe. It is easy to understand that multiple power supply circuits 10 provide multiple voltage sources for the load, but only one power supply circuit 10 is allowed to supply power to the load at any given time. In each power supply circuit 10, the power supply interface 110 is connected to the first terminal of the switching device 120, the second terminal of the switching device 120 is connected to the load, and the controlled terminal is connected to the output terminal of the isolation drive circuit 140. That is, the connection between the power supply interface 110 and the load can be controlled by turning the switching device 120 on or off. The switching device 120 can be a MOSFET, a transistor, or a thyristor, etc. This embodiment does not limit the type of the switching device 120. To ensure that there is no voltage crosstalk between the multiple power supply circuits 10, this embodiment controls the switching devices 120 in the other power supply circuits 10 to turn off when the first power supply circuit 10 with voltage is supplying power to the load, thereby avoiding voltage crosstalk between the multiple power supply circuits 10. Specifically, the detection terminal of the power supply detection circuit 130 is connected to the power supply interface 110, and the output terminal is connected to the isolation drive circuit 140. The power supply detection circuit 130 is used to output a power supply signal to the isolation drive circuit 140 when the power supply interface 110 is connected to voltage. In this embodiment, the isolation drive circuit 140 is connected to the power supply detection circuit 130 in other power supply circuits 10, but not to the power supply detection circuit 130 in the same power supply circuit 10. Therefore, when the power supply detection circuit 130 in the first power supply circuit 10 connected to voltage outputs a power supply signal, the power supply signal is output to the isolation drive circuit 140 of other power supply circuits 10 except for the first power supply circuit 10 connected to voltage. When the isolation drive circuit 140 receives the power supply signal, it controls the switching device 120 in the other power supply circuits 10 to turn off, thereby realizing the control of other power supply circuits 10 to turn off when the first power supply circuit 10 is connected to voltage, and avoiding voltage crosstalk between multiple power supply circuits 10.For example: Assuming there are 3 power supply circuits 10, the first power supply circuit 10 is connected to the voltage first, and the power supply detection circuit 130 in the first power supply circuit 10 outputs power supply signals to the isolation drive circuit 140 of the second power supply circuit 10 and the isolation drive circuit 140 of the third power supply circuit 10, so that the switching device 120 in the second power supply circuit 10 and the switching device 120 in the third power supply circuit 10 are turned off.

[0036] It is easy to understand that in the initial state, i.e., when none of the power supply circuits 10 are connected to voltage, the switching devices 120 in the power supply circuit 10 conduct the path between the power supply interface 110 and the load. When the first power supply circuit 10 is connected to voltage, the isolation drive circuit 140 in that power supply circuit 10 does not receive a power supply signal, and the voltage connected to the power supply interface 110 in that power supply voltage supplies power to the load. When subsequent power supply circuits 10 are connected to voltage, since the power supply detection circuit 130 in the first power supply circuit 10 connected to voltage outputs a power supply signal to the isolation drive circuits 140 of the other power supply circuits 10, the isolation drive circuits 140 turn off the switching devices 120 in their respective power supply circuits 10. Therefore, even if the other power supply circuits 10 are connected to voltage, the switching devices 120 in their power supply circuits 10 are turned off.

[0037] In one feasible example, the power supply signal depends on the voltage value connected to the power supply interface 110. For example, the power supply detection circuit 130 divides the voltage value connected to the connected power supply interface 110 and outputs the divided voltage value as the power supply signal to the isolation drive circuit 140. It is easy to understand that when no voltage is connected to the power supply interface 110, the power supply detection circuit 130 outputs zero voltage to the isolation drive circuit 140; when voltage is connected to the power supply interface 110, the power supply detection circuit 130 outputs a voltage with a non-zero amplitude to the isolation drive circuit 140 as the power supply signal. In this example, the power supply signal is derived from the voltage value connected to the power supply interface 110; both exist and disappear simultaneously. Furthermore, the cost is low, as there is no need to specifically detect the voltage at the power supply interface 110.

[0038] This utility model proposes a multi-channel power supply interlock circuit, including multiple power supply circuits 10. Each power supply circuit 10 includes: a power supply interface 110, a switching device 120, a power supply detection circuit 130, and an isolation drive circuit 140. The power supply interface 110 connects the first end of the switching device 120 and the detection end of the power supply detection circuit 130. The second end of the switching device 120 is connected to the load, and the controlled end is connected to the output end of the isolation drive circuit 140. The isolation drive circuit 140 is connected to the output end of the power supply detection circuit 130 in other power supply circuits 10. The power supply interface 110 is used to receive voltage. The power supply detection circuit 130 is used to output a power supply signal when voltage is received at the power supply interface 110. The isolation drive circuit 140 is used to receive the output signal of the power supply detection circuit 130 in other power supply circuits 10, and, upon receiving the power supply signal, controls the switching device 120 in the power supply circuit 10 it is in to turn off. This invention outputs a power supply signal to other power supply circuits 10 when voltage is applied to the power supply circuit 10, thereby shutting off the path from the power supply interface 110 of the other power supply circuits 10 to the load. This prevents the voltage output to the load from entering the other power supply circuits 10, ensuring safety between multiple interfaces and avoiding voltage crosstalk.

[0039] In the first embodiment, although it is possible to prevent the voltage of other power supply circuits 10 from being connected in series when the power supply circuit 10 with the first access voltage supplies power to the load, when there is a power supply circuit 10 with a second access voltage, the isolation drive circuit 140 of the power supply circuit 10 with the first access voltage will receive the power supply signal and then turn off, causing the load to lose power.

[0040] To solve the above problems, in the second embodiment of this utility model, referring to Figure 2 The multi-power supply interlock circuit further includes: a control circuit 150 and an interface detection circuit 160, which is the same number as the power supply circuit 10.

[0041] The detection terminal of each of the interface detection circuits 160 is connected to the corresponding power supply interface 110;

[0042] The output terminals of each of the interface detection circuits 160 are connected to the control circuit 150;

[0043] The interface detection circuit 160 is used to detect whether the power supply interface 110 is connected to the power supply module, and outputs a detection signal to the control circuit 150 when the power supply interface 110 is connected to the power supply module.

[0044] The power supply detection circuit 130 includes: a voltage divider circuit 1310 and a drive circuit 1320;

[0045] The first end of the voltage divider circuit 1310 is connected to the power supply interface 110, the second end is grounded, and the output end is connected to the first end of the drive circuit 1320; the second end of the drive circuit 1320 is grounded, and the controlled end is connected to the control circuit 150; the output end of the voltage divider circuit 1310 is also connected to the input end of the isolation drive circuit 140 in other power supply circuits 10.

[0046] The voltage divider circuit 1310 is used to divide the voltage value at the power supply interface 110 and output it to the corresponding isolation drive circuit 140; wherein, when the power supply interface 110 is connected to voltage, the voltage divider circuit 1310 outputs a power supply signal.

[0047] The control circuit 150 is used to output a drive signal to all drive circuits 1320 except the drive circuit 1320 corresponding to the detection signal when the detection signal is received.

[0048] The driving circuit 1320 is used to turn on when the driving signal is received, and pull down the voltage value at the output terminal of the voltage divider circuit 1310.

[0049] It should be noted that the number of interface detection circuits 160 is the same as the number of power supply circuits 10. Each interface detection circuit 160 is connected to one of the power supply interfaces 110, meaning the detection terminal of each interface detection circuit 160 is connected to the corresponding power supply interface 110. It is easy to understand that the multi-channel power supply interlock circuit disclosed in this utility model does not provide operating voltage to the load; instead, it uses the power supply module connected to each power supply interface 110 to provide voltage. The power supply interface 110 needs to be connected to the power supply module to obtain the voltage provided by the power supply module. The output terminal of each interface detection circuit 160 is connected to the control circuit 150. The interface detection circuit 160 is used to detect whether the power supply interface 110 is connected to the power supply module, and outputs a detection signal to the control circuit 150 when the power supply interface 110 is connected to the power supply module. It should be explained that the interface detection circuit 160 detects whether the connected power supply interface 110 is connected to the power supply module. The connection status of the power supply interface 110 can be determined by detecting the voltage at the contact point in the power supply interface 110 used to connect to the power supply module.

[0050] The first terminal of the voltage divider circuit 1310 is connected to the power supply interface 110, the second terminal is grounded, and the output terminal is connected to the first terminal of the drive circuit 1320. The voltage divider circuit 1310 is used to divide the voltage value at the power supply interface 110 and output it to the corresponding isolation drive circuit 140; wherein, when the power supply interface 110 is connected to voltage, the voltage divider circuit 1310 outputs a power supply signal. It is easy to understand that when the power supply interface 110 is not connected to voltage, the voltage divider circuit 1310 outputs zero voltage. Specifically, the voltage divider circuit 1310 can be a resistor voltage divider circuit 1310. Furthermore, the output terminal of the voltage divider circuit 1310 is connected to the input terminal of the isolation drive circuit 140 in the other power supply circuit 10, that is, the voltage value at the output terminal of the voltage divider circuit 1310 is the voltage value of the power supply signal. The first end of the driving circuit 1320 is connected to the output end of the voltage divider circuit 1310, and the second end is grounded. When the driving circuit 1320 connects the output end of the voltage divider circuit 1310 and ground, the voltage at the output end of the voltage divider circuit 1310 is pulled down to zero, that is, the voltage divider circuit 1310 stops outputting power supply signals to the isolation driving circuit 140 in other power supply circuits 10.

[0051] The control circuit 150 is used to output drive signals to all drive circuits 1320 except the drive circuit 1320 corresponding to the detection signal when the detection signal is received. It should be noted that the detection signal identifies the power supply circuit 10 connected to the power supply module. The interface detection circuit 160 outputs a detection signal to the control circuit 150 when it detects that the corresponding power supply interface 110 is connected to the power supply module. Since the isolation drive circuit 140 in the power supply circuit 10 is connected to the output terminal of the power supply detection circuit 130 in other power supply circuits 10, in this embodiment, the isolation drive circuit 140 is connected to the output terminal of the voltage divider circuit 1310 in other power supply circuits 10. When the control circuit 150 receives the detection signal, it outputs drive signals to the drive circuits 1320 in the power supply circuits 10 other than the power supply circuit 10 identified by the detection signal. Since the drive circuit 1320 can lower the voltage value at the output terminal of the voltage divider circuit 1310 when it is conducting, the isolation drive circuit 140 in the power supply circuit 10 connected to the power supply module does not receive a power supply signal, thereby enabling the power supply circuit 10 to connect the power supply module to the load. Meanwhile, the isolation drive circuit 140 within other power supply circuits 10 receives the power supply signal output from the power supply detection circuit 130 within the power supply circuit 10 connected to the power supply module, and the switching device 120 in the other power supply circuits 10 is turned off. For example, assuming there are four power supply circuits 10, and the first power supply circuit 10 is connected to the power supply module; after receiving the detection signal output by the interface detection circuit 160 that detects the power supply interface 110 of the first power supply circuit 10, the control circuit 150 outputs drive signals to the drive circuits 1320 in the second, third, and fourth power supply circuits 10. The isolation drive circuit 140 of the first power supply circuit 10 is connected to the output terminals of the voltage divider circuits 1310 of the second, third, and fourth power supply circuits 10; and the voltage values ​​at the output terminals of the aforementioned voltage divider circuits 1310 are pulled down to zero under the action of their respective drive circuits 1320. Therefore, the isolation drive circuit 140 within the first power supply circuit 10 does not receive a power supply signal. Furthermore, since the output voltages of the voltage divider circuits 1310 in the second to fourth power supply circuits 10 are pulled down to zero, even if the second power supply circuit 10 is subsequently connected to a corresponding power supply module, the output voltage of the voltage divider circuit 1310 in the second power supply circuit 10 remains zero, thus not affecting the conduction of the first power supply circuit 10. Therefore, when there are a second or more power supply circuits 10 with connected voltages, the first power supply circuit 10 with connected voltage will still conduct.

[0052] The control circuit 150 may include controllers such as MCU, FPGA, SOC or DSP.

[0053] In the third embodiment, the switching device 120 is a depletion-type PMOS transistor. The source of the depletion-type PMOS transistor is connected to the load, the drain is connected to the power supply interface 110, and the gate is connected to the isolation drive circuit 140. The influence of the first power supply circuit 10 with the applied voltage on the depletion-type PMOS transistors in the other power supply circuits 10 is now analyzed. Because the source of the depletion-type PMOS transistor is connected to the load, the sources of the depletion-type PMOS transistors in each power supply circuit 10 are interconnected. When the first power supply circuit 10 with the applied voltage supplies power to the load, the voltage at the source of the depletion-type PMOS transistors in the other power supply circuits 10 is the load operating voltage. Furthermore, since the voltage applied to the first power supply circuit 10 is divided by the corresponding voltage divider circuit 1310 and outputs a power supply signal to the isolation drive circuit 140 in the other power supply circuits 10, the isolation drive circuit 140 in the other power supply circuits 10 controls the corresponding depletion-type PMOS transistors to turn off. Specifically, a power supply signal can be output to the gate of the depletion-type PMOS transistor. By controlling the voltage division coefficient of the voltage divider circuit 1310, the gate-source voltage difference of the depletion-type PMOS transistor is made greater than the threshold voltage, thereby turning off the depletion-type PMOS transistor. This also disconnects the power supply interface 110 in the other power supply circuit 10 from the load.

[0054] In the fourth embodiment, as Figure 3 As shown, the voltage divider circuit 1310 includes: a first resistor R1 and a second resistor R2; the drive circuit 1320 includes: a first MOSFET and a third resistor R3;

[0055] The first end of the first resistor R1 is connected to the power supply interface 110, and the second end is connected to the first end of the second resistor R2 and the drain of the first MOS transistor; the second end of the second resistor R2 is grounded; the gate of the first MOS transistor is connected to the control circuit 150 and the first end of the second resistor R2, and the source is connected to the second end of the second resistor R2 and grounded.

[0056] The voltage divider circuit 1310, composed of the first resistor R1 and the second resistor R2, divides the voltage connected to the power supply interface 110. The voltage division coefficient is related to the ratio of the values ​​of the first resistor R1 and the second resistor R2. The drain of the first MOSFET is connected to the output terminal of the voltage divider circuit 1310, the source is grounded, and the gate is connected to the control circuit 150. The first MOSFET is turned on by the control circuit 150, pulling down the voltage value at the output terminal of the voltage divider circuit 1310. The first resistor R1 and the second resistor R2 utilize the voltage connected to the power supply interface 110 to form a power supply signal, which has the advantages of low cost and simple and effective solution. In addition, the input terminal of the isolation drive circuit 140 is connected to the output terminal of the voltage divider circuit 1310. When no voltage is connected to the power supply interface 110, the input terminal of the isolation drive circuit 140 is pulled down to zero through the second resistor R2.

[0057] The third resistor R3 is connected in parallel between the gate and the source of the first MOS transistor to stabilize the gate voltage, prevent abnormal conduction or damage caused by gate floating, and also to provide a discharge path to discharge gate charge, so that the first MOS transistor can be turned off quickly and avoid turn-off delay.

[0058] The first MOS transistor can be an NMOS transistor.

[0059] In the fifth embodiment, as Figure 4 As shown, the isolation drive circuit 140 includes: a plurality of diodes; the difference between the number of power supply circuits 10 and the number of diodes is 1;

[0060] Multiple diodes are connected in parallel, the cathodes of the multiple diodes are connected to each other and connected to the controlled terminal of the switching device 120, and the anodes of the multiple diodes are connected one-to-one to the output terminal of the power supply detection circuit 130 in the other power supply circuit 10.

[0061] It should be noted that, since the isolation drive circuit 140 receives the output signal from the power supply detection circuit 130 in other power supply circuits 10, the number of diodes is one less than the total number of power supply circuits 10. Multiple diodes are connected in parallel, and the cathodes of the diodes are interconnected and connected to the controlled terminal of the switching device 120. For example, the cathode is connected to the gate of the depletion-type PMOS transistor. It is easy to understand that the power supply modules connected to each power supply circuit 10 belong to different power sources. In this embodiment, parallel diodes are used to achieve isolation between the other power supply circuits 10, ensuring the safety of the power supply circuits 10 and preventing cross-current. Now, let's analyze the first power supply circuit 10 with the applied voltage and the other power supply circuits 10. The voltage values ​​at the anodes of the multiple diodes in the first power supply circuit 10 with the applied voltage are pulled down to zero by the drive circuit 1320 in the other power supply circuits 10. Due to the presence of the power supply signal output by the first power supply circuit 10 with the applied voltage, at least one of the voltage values ​​at the anode of the plurality of diodes in the other power supply circuits 10 is a power supply signal; the diode outputs the power supply signal to the controlled terminal of the switching device 120, thereby turning off the switching device 120.

[0062] In the sixth embodiment, as Figure 5 As shown, the interface detection circuit 160 includes: a voltage-type controller;

[0063] The first end of the voltage-type controller is connected to the IO port of the control circuit 150, the second end is grounded, and the controlled end is connected to the power supply interface 110.

[0064] The voltage-type controller is used to open the path between the IO port and ground and pull down the potential of the IO port when the power supply interface 110 is connected to a voltage; the voltage is greater than a set voltage value.

[0065] The interface detection circuit 160 is used to detect whether the power supply interface 110 is connected to a power supply module, and outputs a detection signal to the control circuit 150 when the power supply interface 110 is connected to a power supply module. Specifically, it determines whether the power supply interface 110 is connected to a power supply module by the voltage value at the relevant contact of the power supply interface 110. In this embodiment, the controlled terminal of the voltage-type controller is connected to the power supply interface 110, specifically, to the contact point in the power supply interface 110 used for connection with the power supply module. When the power supply interface 110 is connected to a power supply module, the voltage value at the contact point changes accordingly. For example, the CC port (contact) of a TYPE-C interface.

[0066] The voltage-type controller is used to establish a connection between the I / O port and ground when a voltage is applied to the power supply interface 110; by pulling the voltage at the I / O port of the control circuit 150 down to zero, it notifies the control circuit 150 that the corresponding power supply interface 110 is connected to the power supply module. Correspondingly, the initial potential of the I / O port of the control circuit 150 is high. The control circuit 150 detects that the corresponding power supply interface 110 is connected to the power supply module by the action of pulling the I / O port voltage down.

[0067] Furthermore, it should be explained that this embodiment utilizes the voltage value at the power supply interface 110 to transmit information to the control circuit 150, which has the advantages of low cost and simplicity, avoiding the device costs caused by voltage detection and judgment in traditional solutions. Additionally, the set voltage can be the threshold voltage VGS(th) of the voltage-type controller. The voltage-type controller can be an NMOS transistor.

[0068] In the above embodiments, the multiple power supply circuits 10 have the same priority, with the power supply circuit 10 that first receives voltage continuously supplying power to the load. However, considering that in real-world scenarios, the voltage source for supplying power to the load can be an energy storage unit or mains power, and the energy storage unit can be a battery, supercapacitor, or other object that can store and release electrical energy, it is easy to see that, in the presence of mains power, it should be used preferentially to power the load. Therefore, in the multi-power supply interlock circuit, the power supply circuit 10 that receives mains power should have a higher priority than the other power supply circuits 10.

[0069] To achieve the above effects, in the seventh embodiment, as follows: Figure 6 As shown, the multi-power supply interlock circuit further includes: a power supply circuit 20; the power supply circuit 20 includes: a power interface 210, a power detection circuit 220, and a power switch circuit 230;

[0070] The first end of the power switch circuit 230 is connected to the power interface 210, and the second end is connected to the load.

[0071] The power interface 210 is used to connect to the power supply voltage;

[0072] The input terminal of the power detection circuit 220 is connected to the power interface 210, and the output terminal is connected to the control circuit 150. The power detection circuit 220 is used to detect whether the power interface 210 is connected to a power module, and when the power interface 210 is connected to a power module, it outputs a power detection signal to the control circuit 150.

[0073] The control circuit 150 is also used to control the power switch circuit 230 to open the path between the power interface 210 and the load, and to stop outputting the drive signal when the power detection signal is received.

[0074] It should be explained that the power supply voltage can be mains power or obtained through a transformation of mains power, such as: mains power rectified to obtain DC power, mains power converted to AC power by frequency conversion, or mains power rectified and then inverted to obtain AC power, etc. Furthermore, the power module is used to provide the power supply voltage, and the interface in the power module for outputting the power supply voltage is connected to the power interface 210. The power detection circuit 220 detects whether the power interface 210 is connected to the power module, specifically by detecting the voltage value of the corresponding contacts of the power interface 210, or by detecting the voltage value of the power interface 210 itself. The power switch circuit 230 is located between the power interface 210 and the load; after receiving the power detection signal output by the power detection circuit 220, the control circuit 150 controls the power switch circuit 230 to open the path between the power interface 210 and the load, so that the power interface 210 outputs the power supply voltage to power the load. Additionally, the control circuit 150 also stops outputting drive signals to the drive circuits 1320 in all power supply circuits 10. When the control circuit 150 receives a detection signal, it uses the drive circuit 1320 to pull down the voltage at the output of the voltage divider circuit 1310, providing an isolated drive circuit 140 (which receives no power supply signal) for the first power supply circuit 10 receiving the voltage, thus establishing a connection between the power supply interface 110 and the load. However, in this embodiment, the control circuit 150 stops outputting the drive signal when it receives a power detection signal. The first power supply circuit 10 receiving the voltage will be affected by subsequent power supply circuits receiving the voltage and will be shut down.

[0075] To prevent voltage crosstalk between the power supply circuit 20 and the first power supply circuit 10 connected to the power supply voltage, the power detection circuit 220 is connected to the input terminals of the isolation drive circuits 140 in all the power supply circuits 10. The power detection circuit 220 can also output a power supply signal to the input terminals of all isolation drive circuits 140 when a power module is connected to the power interface 210. It should be noted that the amplitude of the power supply signal is not zero. Therefore, by outputting a power supply signal to all isolation drive circuits 140 and turning off the switching devices 120 in all power supply circuits 10, it is ensured that all power supply circuits 10 are prohibited from supplying power to the load when a power supply voltage is connected to the power interface 210, thus preventing voltage crosstalk.

[0076] like Figure 7 As shown, the power supply circuit 20 further includes: a comparison conduction circuit 240;

[0077] The first end of the comparison conduction circuit 240 is connected to the power interface 210, the second end is connected to the battery output terminal, and the output terminal is connected to the first end of the power switch circuit 230.

[0078] The comparison conduction circuit 240 is used to connect the power interface 210 and the power switch circuit 230 when the power supply voltage connected to the power interface 210 is greater than the battery voltage.

[0079] It should be explained that the multi-power supply interlock circuit can be applied to battery-powered devices. If the power supply voltage is less than or equal to the battery voltage, it indicates that the power supply voltage is too low, which will cause the load to malfunction or experience performance degradation. In this embodiment, the comparison circuit 240 compares the power supply voltage connected to the power interface 210 with the battery voltage. If the power supply voltage connected to the power interface 210 is greater than the battery voltage, the path between the power interface 210 and the power switch circuit 230 is established.

[0080] like Figure 8 As shown, the comparison conduction circuit 240 includes: a fourth resistor R4, a fifth resistor R5, and a second MOS transistor;

[0081] The source of the second MOSFET is connected to the power interface 210, and the drain is connected to the first terminal of the power switch circuit 230; the first terminal of the fourth resistor R4 is connected to the battery output terminal, and the second terminal is connected to the gate of the second MOSFET and the first terminal of the fifth resistor R5; the second terminal of the fifth resistor R5 is grounded.

[0082] The second MOSFET is disposed between the power interface 210 and the power switch circuit 230. In one example, the gate of the second MOSFET can be connected to the battery output terminal, the source to the power interface 210, and the drain to the power switch circuit 230. The second MOSFET can be a PMOS transistor, particularly a depletion-type PMOS transistor. When the power supply voltage is greater than the battery voltage, the path between the power interface 210 and the power switch circuit 230 is turned on.

[0083] To flexibly adjust the power supply voltage amplitude to meet the required standard, the voltage value output to the gate of the second MOSFET can be adjusted based on the battery voltage. In another example, the resistor divider circuit 1310 formed by the fourth resistor R4 and the fifth resistor R5 divides the battery voltage at the battery output terminal and outputs it to the gate of the second MOSFET. The gate voltage value of the second MOSFET can be adjusted by determining the ratio of the values ​​of the fourth resistor R4 and the fifth resistor R5. Furthermore, the operating voltage of different loads can be adapted by adjusting the values ​​of the fourth resistor R4 and / or the fifth resistor R5.

[0084] like Figure 9 As shown, the power switch circuit 230 includes: a third MOSFET, a fourth MOSFET, a sixth resistor R6, and a seventh resistor R7;

[0085] The drain of the third MOS transistor is connected to the output terminal of the comparator circuit 240, the source is connected to the load and the first terminal of the sixth resistor R6, and the gate is connected to the drain of the fourth MOS transistor and the second terminal of the sixth resistor R6; the gate of the fourth MOS transistor is connected to the control circuit 150 and the first terminal of the seventh resistor R7, the source is connected to the second terminal of the seventh resistor R7, and grounded.

[0086] It should be noted that the third MOSFET is positioned between the comparator circuit 240 and the load, with its gate connected to the drain of the fourth MOSFET. The source of the fourth MOSFET is grounded, and its gate is connected to the control circuit 150. Therefore, the control circuit 150 is also used to output a voltage to the gate of the fourth MOSFET upon receiving the power detection signal, controlling the fourth MOSFET to conduct, thereby grounding the gate of the third MOSFET and causing it to conduct, thus establishing a path between the comparator circuit and the load. The sixth resistor R6 is connected in parallel between the gate and source of the third MOSFET to accelerate the turn-off speed of the third MOSFET; the seventh resistor R7 is connected in parallel between the gate and source of the fourth MOSFET to accelerate the turn-off speed of the fourth MOSFET. The third MOSFET can be a depletion-mode PMOS transistor, and the fourth MOSFET can be an enhancement-mode NMOS transistor.

[0087] like Figure 10 As shown, the power detection circuit 220 includes: an eighth resistor R8, a ninth resistor R9, a first bidirectional TVS diode, a second bidirectional TVS diode, and a fifth MOSFET.

[0088] The first end of the eighth resistor R8 is connected to the power interface 210 and the first end of the first bidirectional TVS diode. The second end is connected to the first end of the power switch circuit 230, the first end of the second bidirectional TVS diode, the first end of the ninth resistor R9, and the gate of the fifth MOSFET. The second ends of the first bidirectional TVS diode, the second end of the first bidirectional TVS diode, and the second end of the ninth resistor R9 are connected and grounded. The source of the fifth MOSFET is grounded, and its drain is connected to the control circuit 150. When a power supply voltage is applied to the power interface 210, the fifth MOSFET is turned on, outputting zero voltage to the control circuit 150 as a power detection signal.

[0089] In addition, the first end of the ninth resistor R9 can also be connected to the input end of the isolation drive circuit 140 in each power supply circuit 10, so as to output a power supply signal to the isolation drive circuit 140 when the power interface 210 is connected to the power supply voltage.

[0090] In this eighth embodiment, the number of power supply circuits 10 is two, such as... Figure 11 As shown, Figure 11 This is a schematic diagram of the multi-power supply interlock circuit in this embodiment.

[0091] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A multi-channel power supply interlock circuit, characterized in that, The multi-power supply interlock circuit includes: Multiple power supply circuits, each of which includes: a power supply interface, a switching device, a power supply detection circuit, and an isolation drive circuit; The power supply interface connects the first terminal of the switching device and the detection terminal of the power supply detection circuit; the second terminal of the switching device is connected to the load; and the controlled terminal is connected to the output terminal of the isolation drive circuit. The isolation drive circuit is connected to the output terminal of the power supply detection circuit in other power supply circuits. The power supply interface is used to connect to voltage; The power supply detection circuit is used to output a power supply signal when a voltage is applied to the power supply interface. The isolation drive circuit is used to receive the output signal of the power supply detection circuit in other power supply circuits, and, upon receiving the power supply signal, control the switching device in the power supply circuit to turn off.

2. The multi-power supply interlock circuit as described in claim 1, characterized in that, The multi-power supply interlock circuit also includes: a control circuit and an interface detection circuit of the same number as the power supply circuit; The detection terminal of each interface detection circuit is connected to the corresponding power supply interface; The output terminals of each of the interface detection circuits are connected to the control circuit; The interface detection circuit is used to detect whether the power supply interface is connected to the power supply module, and outputs a detection signal to the control circuit when the power supply interface is connected to the power supply module. The power supply detection circuit includes: a voltage divider circuit and a drive circuit; The first terminal of the voltage divider circuit is connected to the power supply interface, the second terminal is grounded, and the output terminal is connected to the first terminal of the drive circuit; the second terminal of the drive circuit is grounded, and the controlled terminal is connected to the control circuit; the output terminal of the voltage divider circuit is also connected to the input terminal of the isolated drive circuit in other power supply circuits. The voltage divider circuit is used to divide the voltage value at the power supply interface and output it to the corresponding isolation drive circuit; wherein, when the power supply interface is connected to voltage, the voltage divider circuit outputs a power supply signal. The control circuit is used to output drive signals to all drive circuits except the drive circuit corresponding to the detection signal when the detection signal is received. The driving circuit is used to turn on when the driving signal is received, thereby pulling down the voltage value at the output terminal of the voltage divider circuit.

3. The multi-power supply interlock circuit as described in claim 2, characterized in that, The switching device is a depletion-type PMOS transistor.

4. The multi-power supply interlock circuit as described in claim 3, characterized in that, The voltage divider circuit includes: a first resistor and a second resistor; the driving circuit includes: a first MOSFET and a third resistor; The first end of the first resistor is connected to the power supply interface, and the second end is connected to the first end of the second resistor and the drain of the first MOS transistor; the second end of the second resistor is grounded; the gate of the first MOS transistor is connected to the control circuit and the first end of the second resistor, and the source is connected to the second end of the second resistor and grounded.

5. The multi-power supply interlock circuit as described in any one of claims 1 to 4, characterized in that, The isolation drive circuit includes: a plurality of diodes; the difference between the number of power supply circuits and the number of diodes is 1; Multiple diodes are connected in parallel, the cathodes of the multiple diodes are interconnected and connected to the controlled terminal of the switching device, and the anodes of the multiple diodes are connected one-to-one to the output terminal of the power supply detection circuit in other power supply circuits.

6. The multi-power supply interlock circuit as described in any one of claims 2 to 4, characterized in that, The interface detection circuit includes: a voltage-type controller; The first terminal of the voltage-type controller is connected to the IO port of the control circuit, the second terminal is grounded, and the controlled terminal is connected to the power supply interface. The voltage-type controller is used to open the path between the IO port and ground and pull down the potential of the IO port when the power supply interface is connected to a voltage; the voltage is greater than a set voltage value.

7. The multi-power supply interlock circuit as described in any one of claims 2 to 4, characterized in that, The multi-power supply interlock circuit further includes: a power supply circuit; the power supply circuit includes: a power interface, a power detection circuit, and a power switch circuit. The first end of the power switch circuit is connected to the power interface, and the second end is connected to the load. The power interface is used to connect to the power supply voltage; The input terminal of the power detection circuit is connected to the power interface, and the output terminal is connected to the control circuit. The power detection circuit is used to detect whether the power interface is connected to the power module, and when the power interface is connected to the power module, it outputs a power detection signal to the control circuit. The control circuit is also used to control the power switch circuit to conduct the path between the power interface and the load, and to stop outputting the drive signal when the power detection signal is received.

8. The multi-power supply interlock circuit as described in claim 7, characterized in that, The power supply circuit further includes: a comparison conduction circuit; The first end of the comparison circuit is connected to the power interface, the second end is connected to the battery output terminal, and the output terminal is connected to the first end of the power switch circuit. The comparison conduction circuit is used to connect the power interface and the power switch circuit when the power supply voltage connected to the power interface is greater than the battery voltage.

9. The multi-power supply interlock circuit as described in claim 8, characterized in that, The comparison conduction circuit includes: a fourth resistor, a fifth resistor, and a second MOSFET; The source of the second MOSFET is connected to the power interface, and the drain is connected to the first terminal of the power switch circuit; the first terminal of the fourth resistor is connected to the battery output terminal, and the second terminal is connected to the gate of the second MOSFET and the first terminal of the fifth resistor; the second terminal of the fifth resistor is grounded.

10. The multi-power supply interlock circuit as described in claim 8, characterized in that, The power switch circuit includes: a third MOSFET, a fourth MOSFET, a sixth resistor, and a seventh resistor; The drain of the third MOS transistor is connected to the output terminal of the comparator circuit, the source is connected to the load and the first terminal of the sixth resistor, and the gate is connected to the drain of the fourth MOS transistor and the second terminal of the sixth resistor; the gate of the fourth MOS transistor is connected to the control circuit and the first terminal of the seventh resistor, the source is connected to the second terminal of the seventh resistor, and grounded.

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