A power supply device switching circuit
By introducing anti-reverse insertion circuit, overvoltage protection circuit and multiplexing circuit into the power supply switching circuit, and using transistors and Zener diodes to solve the problems of reverse connection and backflow of the power supply, safe and reliable power supply switching is achieved, reducing cost and power consumption.
Patent Information
- Application Number
- CN202110759369.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-07-05
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2041-07-05
AI Technical Summary
In existing technologies, multiple power supplies are prone to problems such as reverse connection of power supply devices, excessive input voltage, and power backflow, which can lead to component damage or system failure. Furthermore, existing solutions, such as using diodes, have high conduction losses or use dedicated integrated circuits, which are costly.
It employs anti-reverse insertion circuit, overvoltage protection circuit, and multiplexing circuit, using transistors as switching devices, combined with Zener diodes and reference sampling circuit, to achieve safe switching and overvoltage protection of the power supply device, avoiding reverse connection and backflow.
It improves the safety performance of circuits, prevents component damage and system failure, reduces costs and power consumption, and ensures that electronic products work safely and reliably.
Smart Images
Figure CN115589055B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of device power supply, in particular to a power supply device switching circuit. BACKGROUND
[0002] In the related art, a device (for example, a display device) is powered by multiple power supply methods, including an alternating current power supply method, a direct current power supply method using an external adapter, and a battery power supply method. In the alternating current power supply method and the battery power supply method, reverse connection of the power supply device can cause serious consequences such as damage to parts or system failure. In the direct current power supply method using an external adapter, if the adapter is not suitable, the input voltage can be too high, which can cause more serious problems.
[0003] Therefore, how to overcome the technical problems of power supply backflow, reverse connection of the power supply device, and excessive input voltage in multiple power supply methods has become a technical problem to be solved. SUMMARY
[0004] The purpose of the embodiments of the present application is to provide a power supply device switching circuit. The circuit provided by the embodiments of the present application can solve the problems of reverse insertion of the power supply device, excessive input voltage, and power supply backflow in multiple power supply methods, improve the safety performance of the circuit, and ensure that the electronic product works safely and reliably.
[0005] In a first aspect, some embodiments of the present application provide a power supply device switching circuit, which includes a multiple power supply circuit and a target power supply device output circuit. Any power supply circuit in the multiple power supply circuit includes a power supply device configured to provide a power supply signal, an anti-reverse insertion circuit including an anti-reverse insertion input end and an anti-reverse insertion output end, wherein the anti-reverse insertion input end is connected to the output end of the power supply device, an overvoltage protection circuit including an overvoltage protection input end and an overvoltage protection output end, wherein the overvoltage protection input end is connected to the anti-reverse insertion output end, and a multiplexing circuit including a multiplexing input end and a multiplexing output end, wherein the multiplexing input end is connected to the overvoltage protection output end. The target power supply device output circuit includes a target power supply device input end and a target power supply device output end, wherein the target power supply device input end is connected to all multiplexing output ends included in the multiple power supply circuit, and the target power supply device output end serves as an output end of the power supply device switching circuit.
[0006] Some embodiments of the present application can solve the problems of reverse insertion of the power supply device, excessive input voltage, and power supply backflow in multiple power supply methods by providing an anti-reverse insertion circuit, an overvoltage protection circuit, and a multiplexing circuit in the power supply device switching circuit, thereby improving the safety performance of the circuit.
[0007] In some embodiments of the present application, the multiplexing circuit comprises a third transistor T3, a second diode D2, a fourth transistor Q4, a third diode D3, a fourth capacitor C4, a fifth transistor Q5, an eleventh resistor R11 and a twelfth resistor R12; wherein the first electrode of the third transistor T3 is the multiplexing input end, and the second electrode of the third transistor T3 is the multiplexing output end; the first end of the second diode D2 is connected with the first electrode of the third transistor T3, and the first end of the second diode D2 is connected with the overvoltage protection output end; the second electrode of the fourth transistor Q4 is connected with the control electrode of the fourth transistor Q4, and the first electrode of the fourth transistor Q4 is connected with the second end of the second diode D2; the first end of the fourth capacitor C4 is connected with the second electrode of the third transistor T3 and the first end of the third diode D3 respectively, and the second end of the fourth capacitor C4 is grounded; the first electrode of the fifth transistor Q5 is connected with the second end of the third diode D3; the first end of the eleventh resistor R11 is connected with the control electrode of the fourth transistor Q4, the second electrode of the fourth transistor Q4 and the control electrode of the fifth transistor Q5 respectively, and the second end of the eleventh resistor R11 is grounded; the first end of the twelfth resistor R12 is connected with the second electrode of the fifth transistor Q5 and the control electrode of the third transistor T3 respectively, and the second end of the twelfth resistor R12 is grounded.
[0008] The multiplexing circuit of some embodiments of the present application uses a third transistor and a fourth transistor as switching devices to solve the problem of reverse flow of the power supply device in the multi-path power supply circuit, and avoids the problem of high cost caused by using a dedicated integrated anti-reverse connection circuit.
[0009] In some embodiments of the present application, the anti-reverse insertion circuit comprises a first transistor T1, a first capacitor C1, a first resistor R1, a first voltage stabilizing diode D1 and a second resistor R2; wherein the first electrode of the first transistor T1 is the anti-reverse insertion input end, the second electrode of the first transistor T1 is the anti-reverse insertion output end, and the first electrode of the first transistor T1 is connected with the output end of the power supply device; the first end of the first voltage stabilizing diode D1 is connected with the first end of the first capacitor C1, the first end of the first resistor R1 and the second electrode of the first transistor T1 respectively; the first end of the second resistor R2 is connected with the control electrode of the first transistor T1, the second end of the first capacitor C1, the second end of the first resistor R1 and the second end of the first voltage stabilizing diode D1 respectively, and the second end of the second resistor R2 is grounded.
[0010] In the first aspect, the anti-reverse insertion circuit provided by some embodiments of the present application uses a transistor as a switching device to solve the problem of reverse insertion of the power supply device that may occur in the circuit. In the second aspect, by adding a voltage stabilizing diode to the anti-reverse insertion circuit, some embodiments of the present application can protect the circuit components from the impact of transient high-voltage spike pulses and prevent the breakdown of the transistor. In the third aspect, by using the reverse non-conducting mode of the parasitic diode of the first transistor T1, some embodiments of the present application not only achieve the purpose of not damaging the circuit during reverse insertion, but also work with other circuits such as multiplexing circuits and overvoltage protection circuits to solve the problem of reverse insertion of the power supply.
[0011] In some embodiments, the overvoltage protection circuit comprises a second transistor T2, a sixth resistor R6, a third resistor R3, a fourth resistor R4, a second capacitor C2, a sixth transistor Q6, a seventh resistor R7, a ninth resistor R9, a tenth resistor R10, a third capacitor C3, an eighth resistor R8, a fifth resistor R5, and a first voltage stabilizing source U1. The second electrode of the second transistor T2 is the overvoltage protection input end, and the first electrode of the second transistor T2 is the overvoltage protection output end. The first end of the second capacitor C2 is connected to the first end of the third resistor R3, the first end of the fourth resistor R4, the first end of the sixth resistor R6, the second electrode of the second transistor T2, and the anti-reverse insertion output end. The first electrode of the sixth transistor Q6 is connected to the second end of the fourth resistor R4, the second end of the second capacitor C2, and the control electrode of the second transistor T2. The first end of the seventh resistor R7 is connected to the control electrode of the sixth transistor Q6, and the first end of the eighth resistor R8 is connected to the second end of the seventh resistor R7, the first end of the ninth resistor R9, the first end of the tenth resistor R10, and the first end of the third capacitor C3. The first end of the first voltage stabilizing source U1 is connected to the second end of the sixth resistor R6 and the first end of the fifth resistor R5, and the second end of the first voltage stabilizing source U1 is connected to the second end of the fifth resistor R5, the second electrode of the sixth transistor Q6, the second end of the ninth resistor R9, the second end of the tenth resistor R10, and the second end of the third capacitor C3 and grounded. The third end of the first voltage stabilizing source U1 is connected to the second end of the eighth resistor R8 and the second end of the third resistor R3.
[0012] Some embodiments of the present application provide that the overvoltage protection voltage value of the overvoltage protection circuit can be freely set, for example, by adjusting the values of the sixth resistor R6 and the fifth resistor R5 to freely set the protection voltage value. Specifically, when the voltage output by the power supply device is too large, the overvoltage protection circuit using the embodiments of the present application can turn off the second transistor, thereby achieving the purpose of overvoltage protection and improving the safety performance of the circuit.
[0013] In some embodiments of the present application, any one of the power supply circuits further comprises a measuring device for measuring an output voltage value in the corresponding power supply circuit, wherein the power supply device switching circuit further comprises: a processing circuit, an input end of the processing circuit being connected with output ends of all the measuring devices in the multi-way power supply circuit; and a display panel, the display panel being connected with an output end of the processing circuit.
[0014] The embodiments of the present application can obtain and display the current voltage state of the power supply device switching circuit by arranging the measuring device, the processing circuit and the display panel in the circuit switching circuit, so as to facilitate the user to obtain the current output voltage value, improve the user experience and ensure the safety performance of the system.
[0015] In some embodiments of the present application, the measuring device comprises: a thirteenth resistor R13 and a fourteenth resistor R14; wherein a first end of the thirteenth resistor R13 is an input end of the measuring device, the first end of the thirteenth resistor R13 is connected with the overvoltage protection output end and the multiplexing input end respectively; a first end of the fourteenth resistor R14 is connected with a second end of the thirteenth resistor R13, a second end of the fourteenth resistor R14 is grounded, and the first end of the fourteenth resistor R14 or the second end of the thirteenth resistor R13 serves as an output end of the measuring device.
[0016] The embodiments of the present application provide a measuring device, which accurately measures the voltage value of the first end of the fourteenth resistor R14, thereby providing a basis for calculating the current output voltage value of the power supply device switching circuit.
[0017] In some embodiments of the present application, the types of all the transistors include PMOS or triode.
[0018] The embodiments of the present application use PMOS or triode as switching devices, which can effectively overcome the voltage drop loss caused by using diode as switching device, and avoid the problem of high cost caused by using special IC anti-reverse connection circuit, thereby reducing the power consumption of the electronic system and saving the cost of the user. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0020] Figure 1 One of the constituent block diagrams of the power supply device switching circuit provided by some embodiments of the present application;
[0021] Figure 2 A second block diagram of the power supply switching circuit provided in some embodiments of this application;
[0022] Figure 3 Circuit diagrams of multiplexing circuits provided in some embodiments of this application;
[0023] Figure 4 Circuit diagrams of anti-reverse insertion circuits provided in some embodiments of this application;
[0024] Figure 5 Circuit diagrams of overvoltage protection circuits provided in some embodiments of this application;
[0025] Figure 6 A circuit diagram of any power supply circuit provided for some embodiments of this application;
[0026] Figure 7 Circuit diagrams of measuring devices provided in some embodiments of this application;
[0027] Figure 8 The circuit diagram provided for some embodiments of this application shows a power supply device switching circuit including three power supply circuits. Detailed Implementation
[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0029] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0030] In the related art, the unidirectional conduction performance of a diode is used to solve the problem of power supply device power supply backflow, but the diode conduction loss is large, the efficiency is low, and a heat sink needs to be added in some cases, occupying product or system space. In the case of low voltage, the use of Schottky diode can reduce the loss, but the overall efficiency is not high. A dedicated integrated circuit can also be used to solve the power supply device power supply backflow, but there is a problem of high application cost.
[0031] At least to solve the above technical problems and the problems existing in the related art in the background art, some embodiments of the present application provide a power supply device switching circuit, which comprises a power supply device (for example, a direct current power supply device or an alternating current power supply device, etc.), an anti-reverse insertion circuit, an overvoltage protection circuit and a multiplexing circuit. The multiplexing circuit detects all power supply devices and confirms the target power supply device, and then supplies power to the related equipment (for example, a display device). Since each power supply device in some embodiments of the present application has an independent anti-reverse insertion circuit, the power supply of one of the power supply devices can be switched at any time, thereby ensuring that the power supply of other power supply devices to the related equipment is not affected.
[0032] The power supply device switching circuit provided by some embodiments of the present application is exemplarily described below in combination with the accompanying drawings.
[0033] As shown in Figure 1 , in some embodiments of the present application, the power supply device switching circuit 100 comprises a multi-path power supply circuit 110 and a target power supply device output circuit 120.
[0034] Any one of the multi-path power supply circuit 110 comprises:
[0035] a power supply device (for example, a first power supply device 1111 of Figure 1 ), the power supply device being configured to provide a power supply signal.
[0036] an anti-reverse insertion circuit, the anti-reverse insertion circuit comprising an anti-reverse insertion input end (for example, a first anti-reverse insertion input end 2A of Figure 1 ) and an anti-reverse insertion output end (for example, a first anti-reverse insertion output end 2B of Figure 1 ), wherein the anti-reverse insertion input end is connected with the output end of the power supply device.
[0037] an overvoltage protection circuit, the overvoltage protection circuit comprising an overvoltage protection input end (for example, a first overvoltage protection input end 3A of Figure 1 ) and an overvoltage protection output end (for example, a first overvoltage protection output end 3B of Figure 1 ), wherein the overvoltage protection input end is connected with the anti-reverse insertion output end.
[0038] a multiplexing circuit, the multiplexing circuit comprising a multiplexing input end (for example, a first multiplexing input end 4A of Figure 1a first multiplex input end 4A) and a multiplex output end (for example, Figure 1 a first multiplex output end 4B), wherein the multiplex input end is connected with the overvoltage protection output end.
[0039] The target power supply device output circuit 120 comprises a target power supply device input end 5A and a target power supply device output end 5B, wherein the target power supply device input end 5A is connected with all the multiplex output ends comprised by the multiplexing power supply circuit, and the target power supply device output end 5B is taken as the output end of the power supply device switching circuit.
[0040] Figure 1 The n (n≥2) -way power supply circuit comprised in the power supply device switching circuit 100 is shown in FIG. 1, wherein the first-way power supply circuit 111 comprises a first power supply device 1111, a first anti-reverse insertion circuit 1112, a first overvoltage protection circuit 1113 and a first multiplex circuit 1114; the second-way power supply circuit 112 comprises a second power supply device 1121, a second anti-reverse insertion circuit 1122, a second overvoltage protection circuit 1123 and a second multiplex circuit 1124; and the nth-way power supply circuit 11n comprises an nth power supply device 11n1, an nth anti-reverse insertion circuit 11n2, an nth overvoltage protection circuit 11n3 and an nth multiplex circuit 11n4. The specific positions of the input ends and output ends of the circuits comprised by each way of power supply circuit can refer to the description of the first-way power supply circuit 111, and will not be described in detail here to avoid repetition.
[0041] The connection relationship of the power supply device, the anti-reverse insertion circuit, the overvoltage protection circuit and the multiplex circuit in any way of power supply circuit will be described below Figure 1 Taking the first-way power supply circuit 111 as an example, the connection relationship of the power supply device, the anti-reverse insertion circuit, the overvoltage protection circuit and the multiplex circuit in any way of power supply circuit will be described below
[0042] It should be noted that in order to select the target power supply device from the multi-path power supply device, a switching voltage value needs to be set in some embodiments of the present application, and the target power supply device is determined according to the set switching voltage value. For example, the target power supply device can be selected from the first power supply device, the second power supply device and the third power supply device in a pairwise comparison manner. Specifically, first, when the voltage difference between the first power supply device and the second power supply device is greater than or equal to the switching voltage value, the power supply device with higher voltage is selected as the candidate target power supply device. Then, the voltage values output by the candidate target power supply device and the third power supply device are compared. When the difference between the two is greater than or equal to the switching voltage, the power supply device with higher voltage is selected as the target power supply device. For example, the switching voltage value is set to 0.4V.
[0043] In some embodiments of the present application, in order to facilitate users to obtain the output voltage value of the current power supply device switching circuit 100, improve user experience, and ensure the safety performance of the system, in addition to the above-mentioned circuit components, the power supply device switching circuit further includes a processing circuit and a display panel, and any one of the power supply circuits further includes a measuring device, as shown in Figure 2
[0044] Unlike the prior art, Figure 1 Figure 2 A corresponding measuring device is added to each power supply circuit, and a processing circuit 130 and a display panel 140 are added to all measuring devices to detect the remaining power of each power supply device and display the remaining power in real time.
[0045] For example, as shown in Figure 2 The first power supply circuit 111 of the power supply device switching circuit 100 of some embodiments of the present application further includes a first measuring device 1115, wherein the input end 6A of the first measuring device 1115 is connected with the first overvoltage protection output end and the first multiplexing input end respectively, and the output end 6B of the first measuring device 1115 is connected with the input end of the processing circuit 130. It can be understood that Figure 2 The power supply device switching circuit includes measuring devices (for example, Figure 2 The second power supply circuit 112 includes a second measuring device 1125, and the nth power supply circuit 11n includes an nth measuring device 11n5). It should be noted that the connection mode of the measuring device (such as the second measuring device 1125, the nth measuring device 11n5) of any one of the power supply circuits and the corresponding power supply circuit is the same as that of the first measuring device 1115 in the first power supply circuit. To avoid repetition, it will not be described here.
[0046] Figure 2 The input end 7A of the processing circuit 130 is connected with the output end of all the measuring devices in the multipath power supply circuit 110. Figure 2 The display panel 140 is connected with the output end 7B of the processing circuit 130 to receive and display the residual power of the corresponding power supply circuit.
[0047] It should be noted that, Figure 2 The measuring device can include a voltmeter or a voltage measuring circuit composed of related elements.
[0048] The following exemplary describes the circuit components of the power supply device switching circuit 100.
[0049] In order to solve the problem of power supply device backflow in the circuit, and overcome the problem of high cost caused by using diode as a switching device and using a special integrated anti-reverse connection circuit, the multiplexing circuit included in the power supply device switching circuit of some embodiments of the present application includes: a third transistor T3, a second diode D2, a fourth transistor Q4, a third diode D3, a fourth capacitor C4, a fifth transistor Q5, an eleventh resistor R11 and a twelfth resistor R12.
[0050] The following exemplary describes any multiplexing circuit of some embodiments of the present application with a PMOS type third transistor T3.
[0051] As shown in Figure 3 , the first pole of the third transistor T3 is the multiplexing input end, and the second pole of the third transistor T3 is the multiplexing output end; the first end of the second diode D2 is connected with the first pole of the third transistor T3 and the overvoltage protection output end at point A; the second pole of the fourth transistor Q4 is connected with the control pole of the fourth transistor Q4, and the first pole of the fourth transistor Q4 is connected with the second end of the second diode D2; the first end of the fourth capacitor C4 is connected with the second pole of the third transistor T3 and the first end of the third diode D3 at point C, and the second end of the fourth capacitor C4 is grounded; the first end of the fifth transistor Q5 is connected with the second end of the third diode D3; the first end of the eleventh resistor R11 is connected with the control pole of the fourth transistor Q4, the second pole of the fourth transistor Q4 and the control pole of the fifth transistor Q5 at point B, and the second end of the eleventh resistor R11 is grounded; the first end of the twelfth resistor R12 is connected with the second pole of the fifth transistor Q5 and the control pole of the third transistor T3 at point D, and the second end of the twelfth resistor R12 is grounded.
[0052] In Figure 3 the multiplexing circuit shown, the third transistor T3 serves as an anti-backflow device.
[0053] In order to prevent the serious consequences of part damage, system failure and the like caused by reverse connection of the power supply device, a switch is usually added between the input of the power supply device and the load, and the switch is generally a diode or a special integrated anti-reverse connection circuit. However, using a diode as a switch device will bring a large voltage drop loss, and using a special integrated anti-reverse connection circuit has a high cost. Therefore, in order to effectively solve the problems caused by the reverse connection of the power supply device and overcome some disadvantages in the prior art, the anti-reverse plug-in circuit included in the power supply device switching circuit of some embodiments of the present application includes a first transistor T1, a first capacitor C1, a first resistor R1, a first voltage stabilizing diode D1 and a second resistor R2. The following will be described in combination with Figure 4 Exemplary description of any one of the anti-reverse plug-in circuits included in the power supply device switching circuit provided by some embodiments of the present application.
[0054] As shown in Figure 4 the first electrode of the first transistor T1 is the anti-reverse plug-in input end, the second electrode of the first transistor T1 is the anti-reverse plug-in output end, and the first electrode of the first transistor T1 is connected to the output end of the power supply device; the first end of the first voltage stabilizing diode D1 is connected to point E together with the first end of the first capacitor C1, the first end of the first resistor R1 and the second electrode of the first transistor T1; the first end of the second resistor R2 is connected to point F together with the control electrode of the first transistor T1, the second end of the first capacitor C1, the second end of the first resistor R1 and the second end of the first voltage stabilizing diode D1, and the second end of the second resistor R2 is grounded.
[0055] In the above anti-reverse plug-in circuit, there is a maximum specified voltage between the two electrodes of the transistor, for example, the voltage between the gate and the source of the MOS transistor can only reach 20V at most. Therefore, a voltage stabilizing diode (for example, a Zener diode (ZD) or a Transient Voltage Suppressor (TVS)) is added between the second electrode and the third electrode of the first transistor in the anti-reverse plug-in circuit to prevent the voltage difference between the second electrode and the third electrode of the first transistor from being greater than 20V. In this way, even if the input voltage is relatively high (such as 36V or 48V), the first transistor can be prevented from being broken down, thereby achieving the protection effect of the circuit.
[0056] In order to avoid the serious consequences of part damage, system failure and the like caused by the excessive input voltage in the circuit, in the power supply device switching circuit of some embodiments of the present application, the overvoltage protection circuit includes a second transistor T2, a sixth resistor R6, a third resistor R3, a fourth resistor R4, a second capacitor C2, a sixth transistor Q6, a seventh resistor R7, a ninth resistor R9, a tenth resistor R10, a third capacitor C3, an eighth resistor R8, a fifth resistor R5 and a first voltage stabilizing source U1. The following will be described in combination with Figure 5The overvoltage protection circuit provided by some embodiments of the present application includes any one of the overvoltage protection circuits in the power supply switching circuit.
[0057] As shown in Figure 5 The second electrode of the second transistor T2 is the overvoltage protection input end, and the first electrode of the second transistor T2 is the overvoltage protection output end. The first end of the second capacitor C2 is connected to point G, and the first end of the second capacitor C2 is connected to the first end of the third resistor R3, the first end of the fourth resistor R4, the first end of the sixth resistor R6, the second electrode of the second transistor T2, and the anti-reverse insertion output end. The first electrode of the sixth transistor Q6 is connected to point H, and the first electrode of the sixth transistor Q6 is connected to the second end of the fourth resistor R4, the second end of the second capacitor C2, and the control electrode of the second transistor T2. The first end of the seventh resistor R7 is connected to the control electrode of the sixth transistor Q6. The first end of the eighth resistor R8 is connected to point J, and the first end of the eighth resistor R8 is connected to the second end of the seventh resistor R7, the first end of the ninth resistor R9, the first end of the tenth resistor R10, and the first end of the third capacitor C3. The first end of the first voltage regulator U1 is connected to point K, and the first end of the first voltage regulator U1 is connected to the second end of the sixth resistor R6 and the first end of the fifth resistor R5. The second end of the first voltage regulator U1 is connected to point M and grounded, and the second end of the first voltage regulator U1 is connected to the second end of the fifth resistor R5, the second electrode of the sixth transistor Q6, the second end of the ninth resistor R9, the second end of the tenth resistor R10, and the second end of the third capacitor C3. The third end of the first voltage regulator U1 is connected to point N, and the third end of the first voltage regulator U1 is connected to the second end of the eighth resistor R8 and the second end of the third resistor R3.
[0058] In the overvoltage protection circuit, a reference sampling (for example, a reference voltage chip TL431) is used to freely set the overvoltage protection value through the resistance values of the two resistors R5 and R6. When the reference sampling reference point voltage is greater than the set value, the reference sampling diode is reversely conducted, the control electrode voltage of the sixth transistor Q6 is pulled down, the second transistor T2 is turned off, and the purpose of overvoltage protection is achieved.
[0059] Figure 6 As shown in the figure, any one of the power supply circuits in the power supply switching circuit provided by some embodiments of the present application, wherein in any one of the power supply circuits, the power supply device 610 (belonging to one kind of power supply device), the anti-reverse insertion circuit 620, the overvoltage protection circuit 630, and the multiplexing circuit 640 are connected in series.
[0060] In order to accurately obtain the current output voltage value of the power supply switching circuit, in the power supply switching circuit of some embodiments of the present application, the measuring device includes the thirteenth resistor R13 and the fourteenth resistor R14, and the voltage value at the output end of the measuring device is measured to provide a basis for calculating the current output voltage value of the power supply switching circuit. Next, the power supply switching circuit provided by some embodiments of the present application will be described in detail with reference to the accompanying drawings. Figure 7Exemplary structure of the measuring device included in any of the power supply device switching circuits provided by some embodiments of the present application is described.
[0061] As shown in Figure 7 the first end of the thirteenth resistor R13 is the input end of the measuring device, and the first end of the thirteenth resistor R13 is connected to the overvoltage protection output end and the multiplexing input end respectively; the first end of the fourteenth resistor R14 is connected to the second end of the thirteenth resistor R13, the second end of the fourteenth resistor R14 is grounded, and the first end of the fourteenth resistor R14 or the second end of the thirteenth resistor R13 serves as the output end of the measuring device.
[0062] The following Figure 8 Exemplary structure of the measuring device included in any of the power supply device switching circuits provided by some embodiments of the present application is described.
[0063] As shown in Figure 8 In some embodiments of the present application, the power supply device switching circuit includes a three-way power supply circuit, wherein,
[0064] The first power supply circuit 111 includes a first power supply device 1111, a first transistor T1, a first capacitor C1, a first resistor R1, a first zener diode D1, a second resistor R2, a second transistor T2, a sixth resistor R6, a third resistor R3, a fourth resistor R4, a second capacitor C2, a sixth transistor Q6, a seventh resistor R7, a ninth resistor R9, a tenth resistor R10, a third capacitor C3, an eighth resistor R8, a fifth resistor R5, a first voltage regulator U1, a third transistor T3, a second diode D2, a fourth transistor Q4, a third diode D3, a fourth capacitor C4, a fifth transistor Q5, an eleventh resistor R11, and a twelfth resistor R12.
[0065] The second power supply circuit 112 includes a second power supply device 1121 (corresponding to the first power supply device 1111), a seventh transistor T7 (corresponding to the first transistor T1), a fifth capacitor C5 (corresponding to the first capacitor C1), a fifteenth resistor R15 (corresponding to the first resistor R1), a fourth zener diode D4 (corresponding to the first zener diode D1), a sixteenth resistor R16 (corresponding to the second resistor R2), an eighth transistor T8 (corresponding to the second transistor T2), a twenty-third resistor R23 (corresponding to the sixth resistor R6), a seventeenth resistor R17 (corresponding to the third resistor R3), an eighteenth resistor R18 (corresponding to the fourth resistor R4), a sixth capacitor C6 (corresponding to the second capacitor C2), a twelfth transistor Q12 (corresponding to the sixth transistor Q6), a nineteenth resistor R19 (corresponding to the seventh resistor R7), a twentieth resistor R20 (corresponding to the ninth resistor R9), a twenty-first resistor R21 (corresponding to the tenth resistor R10), a seventh capacitor C7 (corresponding to the third capacitor C3), a twenty-second resistor R22 (corresponding to the eighth resistor R8), a twenty-fourth resistor R24 (corresponding to the fifth resistor R5), a second voltage regulator U2 (corresponding to the first voltage regulator U1), a ninth transistor T9 (corresponding to the third transistor T3), a fifth diode D5 (corresponding to the second diode D2), a tenth transistor Q10 (corresponding to the fourth transistor Q4), a sixth diode D6 (corresponding to the third diode D3), an eighth capacitor C8 (corresponding to the fourth capacitor C4), an eleventh transistor Q11 (corresponding to the fifth transistor Q5), a twenty-fifth resistor R25 (corresponding to the eleventh resistor R11), and a twenty-sixth resistor R26 (corresponding to the twelfth resistor R12).
[0066] The third power supply circuit 113 includes: a second power supply device 1131 (corresponding to the first power supply device 1111), a thirteenth transistor T13 (corresponding to the first transistor T1), a ninth capacitor C9 (corresponding to the first capacitor C1), a twenty-ninth resistor R29 (corresponding to the first resistor R1), a seventh Zener diode D7 (corresponding to the first Zener diode D1), a thirtieth resistor R30 (corresponding to the second resistor R2), a fourteenth transistor T14 (corresponding to the second transistor T2), a thirty-seventh resistor R37 (corresponding to the sixth resistor R6), a thirty-fifth resistor R35 (corresponding to the third resistor R3), a thirty-sixth resistor R36 (corresponding to the fourth resistor R4), a tenth capacitor C10 (corresponding to the second capacitor C2), an eighteenth transistor Q18 (corresponding to the sixth transistor Q6), a thirty-second resistor R32 (corresponding to the seventh resistor R7), and a thirtieth resistor R30. The three resistors are R33 (corresponding to the ninth resistor R9), R34 (corresponding to the tenth resistor R10), C11 (corresponding to the third capacitor C3), R31 (corresponding to the eighth resistor R8), R38 (corresponding to the fifth resistor R5), U3 (corresponding to the first voltage regulator U1), T15 (corresponding to the third transistor T3), D8 (corresponding to the second diode D2), Q16 (corresponding to the fourth transistor Q4), D9 (corresponding to the third diode D3), C12 (corresponding to the fourth capacitor C4), Q17 (corresponding to the fifth transistor Q5), R39 (corresponding to the eleventh resistor R11), and R40 (corresponding to the twelfth resistor R12).
[0067] The connection relationships of each component in the first power supply circuit 111 can be found in the description above. The connection relationships of each component in the second power supply circuit 112 and the third power supply circuit 113 are the same as the connection relationships of the corresponding components in the first power supply circuit 111.
[0068] It should be noted that, Figure 8 The connection relationships between the components in each power supply circuit can be referenced from the documentation. Figure 6 The description, Figure 8 The functions and connection methods of the components in the second and third power supply circuits corresponding to the first power supply circuit can also be found in the reference for... Figure 6 The description obtains the connection relationship of each component in these circuits, and will not be elaborated on here to avoid repetition.
[0069] The input end of the target power supply device output circuit 120 is connected with the power supply output end of the first power supply circuit 111, the power supply output end of the second power supply circuit 112 and the power supply output end of the third power supply circuit 113 respectively, and the output end of the target power supply device output circuit is used for external power supply; the input end of the processing circuit 130 is connected with the output end of the first measuring device, the output end of the second measuring device and the output end of the third measuring device respectively, and the output end of the processing circuit 130 is connected with the input end of the display panel 140, and the display panel 140 displays the current output voltage value of the power supply device switching circuit.
[0070] In Figure 8 The third transistor T3, the sixth transistor T6 and the ninth transistor T9 play the role of preventing backflow in the corresponding power supply circuit. The following will take the first multiplexing circuit and the second multiplexing circuit as examples to illustrate the backflow prevention function of the third transistor T3 and the sixth transistor T6.
[0071] As Figure 8 If the voltage of the second power supply device 1121 is higher than the voltage of the first power supply device 1111, and the voltage difference is greater than or equal to the switching voltage value, the current flows from the multiplexing output end of the second power supply circuit to the multiplexing output end of the first power supply circuit, that is, the second pole of the third transistor T3, and then the third transistor T3 is turned off, thereby playing the role of preventing backflow.
[0072] It should be noted that, Figure 8 The specific connection of the power supply circuit of any one of the above-mentioned power supply devices can refer to the description in the foregoing, and will not be repeated here.
[0073] In the power supply device switching circuit of some embodiments of the present application, the first transistor T1, the second transistor T2, the third transistor T3, the seventh transistor T7, the eighth transistor T8, the ninth transistor T9, the thirteenth transistor T13, the fourteenth transistor T14 and the fifteenth transistor T15 are P-type MOS (positive channel Metal Oxide Semiconductor, P-type metal oxide semiconductor field effect transistor), the fourth transistor Q4, the fifth transistor Q5, the tenth transistor Q10, the eleventh transistor Q11, the sixteenth transistor Q16 and the seventeenth transistor Q17 are PNP type triodes, and the sixth transistor Q6, the twelfth transistor Q12 and the eighteenth transistor Q18 are NPN triodes.
[0074] In the multiplexing circuit, when the power supply device switching circuit starts to work, the parasitic diode of the P-type MOS in the multiplexing circuit is turned on instantaneously, and then the channel of the P-type MOS is turned on. Since the direct current resistance of the PMOS is very small, only a few milliohms, when the current increases, only a small loss will be generated, and the heat generated is also very small.
[0075] In the anti-reverse insertion circuit, when the power supply device switching circuit starts to work, if the power supply device is inserted reversely, the parasitic diode of the PMOS is reverse non-conductive, thereby playing the role of preventing the problem of reverse insertion of the power supply.
[0076] It should be noted that the transistors used in the embodiments of the present disclosure can all be thin film transistors or field effect transistors or other switching devices with the same characteristics. The control electrode of the transistor is the gate of the transistor. The source and drain of the transistor used here can be symmetrical in structure, so the source and drain can be indistinguishable in structure. In the embodiments of the present disclosure, in order to distinguish the two poles of the transistor other than the gate, one of the poles is directly described as the first pole and the other pole is the second pole, so the first pole and the second pole of all or part of the transistors in the embodiments of the present disclosure can be interchangeable as needed. For example, the first pole of the transistor described in the embodiments of the present disclosure can be the source and the second pole can be the drain; or the first pole of the transistor is the drain and the second pole is the source. In addition, the transistors can be divided into N-type and P-type transistors according to their characteristics. When the transistor is a P-type transistor, the on voltage is a low-level voltage (for example, 0V, -5V, or other values), and the off voltage is a high-level voltage (for example, 5V, 10V, or other values); when the transistor is an N-type transistor, the on voltage is a high-level voltage (for example, 5V, 10V, or other values), and the off voltage is a low-level voltage (for example, 0V, -5V, or other values).
[0077] It should be noted that the embodiments of the present disclosure take each transistor as a P-type transistor as an example for description. Based on the description and teaching of the implementation mode of the present disclosure, those skilled in the art can think of the implementation mode of the P-type transistor or the combination of N-type and P-type transistors without making creative efforts, and therefore, these implementation modes are also within the protection scope of the present disclosure.
[0078] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0079] The above description is merely a specific implementation of the application. One of ordinary skill in the art should appreciate that the application can be implemented in other specific forms without departing from the spirit or essential characteristics of the application. Accordingly, the disclosure of the application is intended for use in all fair and equivalent ways so that those skilled in the art, and with the limited purpose of meeting the patent law requirements, can realize or carry out other and various implementations of the application with the concept and technical solutions of the application. Therefore, the scope of the protection of the application is not limited by the specific implementation described above, but defined by the scope of protection of the claims.
[0080] It should be noted that, in this text, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or device that includes the element.
Claims
1. A power supply device switching circuit characterized by comprising: The power supply device switching circuit comprises: The multi-path power supply circuit, wherein any one of the multi-path power supply circuit comprises: A power supply device for providing a power supply signal; The anti-reverse insertion circuit comprises an anti-reverse insertion input end and an anti-reverse insertion output end, The anti-reverse insertion input end is connected with the output end of the power supply device; The overvoltage protection circuit comprises an overvoltage protection input end and an overvoltage protection output end, wherein the overvoltage protection input end is connected with the anti-reverse insertion output end; The multiplexing circuit comprises a multiplexing input end and a multiplexing output end, wherein The multiplexing input end is connected with the overvoltage protection output end; and The target power supply device output circuit comprises a target power supply device input end and a target power supply device output end, wherein the target power supply device input end is connected with all the multiplexing output ends of the multi-path power supply circuit, and the target power supply device output end serves as the output end of the power supply device switching circuit; The multiplexing circuit comprises a third transistor, a second diode, a fourth transistor, a third diode, a fourth capacitor, a fifth transistor, an eleventh resistor, and a twelfth resistor; The first pole of the third transistor is the multiplexing input end, and the second pole of the third transistor is the multiplexing output end; The first end of the second diode is connected with the first pole of the third transistor, and the first end of the second diode is connected with the overvoltage protection output end; The second pole of the fourth transistor is connected with the control pole of the fourth transistor, and the first pole of the fourth transistor is connected with the second end of the second diode; The first end of the fourth capacitor is connected with the second pole of the third transistor and the first end of the third diode, respectively, and the second end of the fourth capacitor is grounded; The first pole of the fifth transistor is connected with the second end of the third diode; The first end of the eleventh resistor is connected with the control pole of the fourth transistor, the second pole of the fourth transistor, and the control pole of the fifth transistor, respectively, and the second end of the eleventh resistor is grounded; The first end of the twelfth resistor is connected with the second pole of the fifth transistor and the control pole of the third transistor, respectively, and the second end of the twelfth resistor is grounded. The anti-reverse insertion circuit comprises a first transistor, a first capacitor, a first resistor, a first voltage stabilizing diode, and a second resistor; The first pole of the first transistor is the anti-reverse insertion input end, the second pole of the first transistor is the anti-reverse insertion output end, and the first pole of the first transistor is connected with the output end of the power supply device; 2. The power supply switching circuit of claim 1, wherein, The first end of the first voltage stabilizing diode is connected with the first end of the first capacitor, the first end of the first resistor, and the second pole of the first transistor, respectively; The first end of the second resistor is connected with the control pole of the first transistor, the second end of the first capacitor, the second end of the first resistor, and the second end of the first voltage stabilizing diode, respectively, and the second end of the second resistor is grounded. 3. The power supply switching circuit of claim 2, wherein, The overvoltage protection circuit comprises a second transistor, a sixth resistor, a third resistor, a fourth resistor, a second capacitor, a sixth transistor, a seventh resistor, a ninth resistor, a tenth resistor, a third capacitor, an eighth resistor, a fifth resistor and a first voltage stabilizer; Wherein, a second electrode of the second transistor is the overvoltage protection input end, and a first electrode of the second transistor is the overvoltage protection output end; a first end of the second capacitor is connected with a first end of the third resistor, a first end of the fourth resistor, a first end of the sixth resistor, the second electrode of the second transistor and the anti-reverse insertion output end respectively; a first electrode of the sixth transistor is connected with a second end of the fourth resistor, a second end of the second capacitor and a control electrode of the second transistor respectively; a first end of the seventh resistor is connected with the control electrode of the sixth transistor; a first end of the eighth resistor is connected with a second end of the seventh resistor, a first end of the ninth resistor, a first end of the tenth resistor and a first end of the third capacitor respectively; a first end of the first voltage stabilizer is connected with a second end of the sixth resistor and a first end of the fifth resistor respectively, a second end of the first voltage stabilizer is connected with a second end of the fifth resistor, a second electrode of the sixth transistor, a second end of the ninth resistor, a second end of the tenth resistor and a second end of the third capacitor and grounded respectively, and a third end of the first voltage stabilizer is connected with a second end of the eighth resistor and a second end of the third resistor respectively.
4. The power supply switching circuit of claim 3, wherein, The any one power supply circuit further comprises: a measuring device for measuring an output voltage value in the corresponding power supply circuit; Wherein, the power supply device switching circuit further comprises: a processing circuit, an input end of the processing circuit being connected with output ends of all the measuring devices in the multiple power supply circuits; a display panel, the display panel being connected with an output end of the processing circuit.
5. The power supply switching circuit of claim 4, wherein, The measuring device comprises a thirteenth resistor and a fourteenth resistor; Wherein, a first end of the thirteenth resistor is an input end of the measuring device, and the first end of the thirteenth resistor is connected with the overvoltage protection output end and the multiplexing input end respectively; a first end of the fourteenth resistor is connected with a second end of the thirteenth resistor, a second end of the fourteenth resistor is grounded, and the first end of the fourteenth resistor or the second end of the thirteenth resistor is an output end of the measuring device.
6. The power supply switching circuit of any one of claims 2-5, wherein, Types of all the transistors comprise PMOS or triode.
Citation Information
Patent Citations
Power supply switching circuit
CN109638956A
Sleep circuit of vehicle-mounted charger
WO2020215233A1