15V Dual Power Input Seamless Switching Circuit

Abstract

This utility model discloses a seamless 15V dual power input switching circuit, comprising a connector circuit, a switching circuit body, and a protection circuit. The connector circuit includes first and second connector circuits for connecting to an external 15V power input, which are respectively connected to the switching circuit body, enabling switching between the two power sources. The protection circuit connects the first connector circuit and the switching circuit body to prevent reverse connection of the power supply and protect downstream components. Compared with traditional solutions such as contactors, this seamless dual power input switching circuit significantly reduces switching delay, enables zero-interruption switching, and significantly improves power supply reliability, meeting the needs of devices sensitive to power switching time. Furthermore, it uses a combination of general-purpose components, eliminating the need for a dedicated switching chip and effectively reducing BOM costs.

Description

Technical Field

[0001] This utility model belongs to the field of electronic circuit technology, specifically a 15V dual power input seamless switching circuit. Background Technology

[0002] In many electronic device applications, such as medical devices, communication base stations, and industrial sensors, there are strict requirements for power supply reliability and accurate signal processing.

[0003] Currently, most common power switching solutions use contactors, which have the problem of high switching delay, making it difficult to meet the needs of some devices that are sensitive to power switching time. In terms of signal processing, most sine wave shaping circuits have insufficient accuracy and poor matching with digital circuit levels. In addition, some circuits use dual power supplies, which increases circuit complexity and cost.

[0004] Therefore, there is an urgent need for a circuit that can achieve seamless switching between dual power supplies and perform efficient and accurate sine wave shaping. Utility Model Content

[0005] The purpose of this invention is to provide a seamless switching circuit for 15V dual power inputs, in order to solve the problems of high switching delay, insufficient accuracy, and poor matching with digital circuit levels in the existing power switching schemes mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A seamless switching circuit for 15V dual power input, including connector circuit, switching circuit body and protection circuit;

[0008] The connector circuit includes a first connector circuit and a second connector circuit; wherein, the first connector circuit and the second connector circuit are used to connect to an external 15V power input; the first connector circuit and the second connector circuit are respectively connected to the switching circuit body, and the switching circuit body is used to switch the external 15V power supply connected to the first connector circuit and the second connector circuit.

[0009] The protection circuit is connected to the first connector circuit and the switching circuit body respectively. The protection circuit is used to prevent reverse power connection and protect the subsequent circuit components from being damaged by reverse voltage.

[0010] According to the above technical solution, the first connector circuit includes a connector XS1 and an overvoltage protection diode V2; wherein, pins 1 and 2 of connector XS1 are respectively connected to an external 15V power supply and pin 2 of overvoltage protection diode V2, pins 3 and 4 of connector XS1 are respectively connected to pin 1 of overvoltage protection diode V2, and pins 3 and 4 of connector XS1 and pin 1 of overvoltage protection diode V2 are all grounded.

[0011] According to the above technical solution, the second connector circuit includes a connector XS2 and an overvoltage protection diode V5; wherein, pins 1 and 2 of connector XS2 are respectively connected to an external 15V power supply and pin 2 of overvoltage protection diode V5, pins 3 and 4 of connector XS2 are respectively connected to pin 1 of overvoltage protection diode V5, and pins 3 and 4 of connector XS2 and pin 1 of overvoltage protection diode V5 are all grounded.

[0012] According to the above technical solution, the switching circuit body includes a first control module, a second control module, and a third control module; wherein, the first control module, the second control module, and the third control module are connected in sequence for switching 15V power supply.

[0013] According to the above technical solution, the first control module includes resistor R1, resistor R2, capacitor C9, and transistor V4;

[0014] One end of resistor R1 is connected to a 15V power supply, and the other end of resistor R1 is connected to resistor R2, capacitor C9 and the base of transistor V4 respectively; resistor R2, capacitor C9 and the emitter of transistor V4 are all grounded; the collector of transistor V4 is connected to the second control module.

[0015] According to the above technical solution, the second control module includes resistors R3, R4, R5, and R6, capacitor C11, and transistor V6.

[0016] One end of resistor R3 is connected to a 15V power supply, and the other end of resistor R3 is connected to one end of resistors R4 and R5; the other end of resistor R4 is connected to the collector of transistor V4; the other end of resistor R5 is connected to one end of resistor R6, capacitor C11, and the base of transistor V6; the other ends of resistor R6, capacitor C11, and the emitter of transistor V6 are all grounded; the collector of transistor V6 is connected to the third control module.

[0017] According to the above technical solution, the third control module includes resistor R7, resistor R8, capacitor C12, capacitor C13, capacitor C14, capacitor C19, capacitor C21, MOSFET V7, and transistor V8.

[0018] One end of capacitor C12, resistor R7, capacitor C13, and the source (S) terminal of MOSFET V7 are all connected to a 15V power supply; the other end of capacitor C12, resistor R7, capacitor C13, and the gate (G) terminal of MOSFET V7 are all connected to one end of resistor R8 and capacitor C14, respectively.

[0019] The drain of MOSFET V7 is connected to one end of transistor V8. The other end of transistor V8 is connected to one end of capacitor C19 and one end of capacitor C21, respectively. The other ends of capacitors C19 and C21 are grounded.

[0020] The other ends of resistor R8 and capacitor C14 are both connected to the collector of transistor V6.

[0021] According to the above technical solution, the protection circuit includes transistor V1, capacitor C1, capacitor C2 and capacitor C3;

[0022] One end of transistor V1 is connected to a 15V power supply, and the other end of transistor V1 is connected to one end of capacitors C1, C2, and C3 respectively. The other ends of capacitors C1, C2, and C3 are all grounded.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] Compared with traditional power switching solutions such as contactors, the dual-power seamless switching circuit in this invention significantly reduces the switching delay, achieves zero-interruption switching, greatly improves the reliability of power supply, and meets the needs of devices sensitive to power switching time. At the same time, it uses a combination of general-purpose components and eliminates the need for dedicated switching chips, which effectively reduces the BOM cost. Attached Figure Description

[0025] Figure 1 This is a circuit diagram of the switching circuit body in this utility model;

[0026] Figure 2 This is a circuit diagram of the first connector circuit in this utility model;

[0027] Figure 3 This is a circuit diagram of the second connector circuit in this utility model;

[0028] Figure 4 This is a circuit diagram of the protection circuit in this utility model. Detailed Implementation

[0029] 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.

[0030] Example 1

[0031] like Figures 1 to 4 As shown, the 15V dual power input seamless switching circuit includes a connector circuit, a switching circuit body, and a protection circuit.

[0032] The connector circuit includes a first connector circuit and a second connector circuit; wherein, the first connector circuit and the second connector circuit are used to connect to an external 15V power input; the first connector circuit and the second connector circuit are respectively connected to the switching circuit body, and the switching circuit body is used to switch the external 15V power supply connected to the first connector circuit and the second connector circuit.

[0033] The protection circuit is connected to the first connector circuit and the switching circuit body respectively. The protection circuit is used to prevent reverse power connection and protect the subsequent circuit components from being damaged by reverse voltage.

[0034] Compared with traditional power switching solutions such as contactors, the dual-power seamless switching circuit in this invention significantly reduces the switching delay, achieves zero-interruption switching, greatly improves the reliability of power supply, and meets the needs of devices sensitive to power switching time. At the same time, it uses a combination of general-purpose components and eliminates the need for dedicated switching chips, which effectively reduces the BOM cost.

[0035] Example 2

[0036] This embodiment is a further refinement of Embodiment 1.

[0037] like Figure 2 As shown, the first connector circuit includes a connector XS1 and an overvoltage protection diode V2; wherein, pins 1 and 2 of connector XS1 are connected to an external 15V power supply and pin 2 of overvoltage protection diode V2, respectively, pins 3 and 4 of connector XS1 are connected to pin 1 of overvoltage protection diode V2, and pins 3 and 4 of connector XS1 and pin 1 of overvoltage protection diode V2 are all grounded.

[0038] like Figure 3As shown, the second connector circuit includes connector XS2 and overvoltage protection diode V5; pins 1 and 2 of connector XS2 are connected to an external 15V power supply and pin 2 of overvoltage protection diode V5, respectively; pins 3 and 4 of connector XS2 are connected to pin 1 of overvoltage protection diode V5; and pins 3 and 4 of connector XS2 and pin 1 of overvoltage protection diode V5 are all grounded.

[0039] like Figure 1 As shown, the switching circuit body includes a first control module, a second control module, and a third control module; wherein, the first control module, the second control module, and the third control module are connected in sequence for switching the 15V power supply.

[0040] The first control module includes resistor R1, resistor R2, capacitor C9, and transistor V4;

[0041] One end of resistor R1 is connected to a 15V power supply, and the other end of resistor R1 is connected to resistor R2, capacitor C9 and the base of transistor V4 respectively; resistor R2, capacitor C9 and the emitter of transistor V4 are all grounded; the collector of transistor V4 is connected to the second control module.

[0042] The second control module includes resistors R3, R4, R5, and R6, capacitor C11, and transistor V6.

[0043] One end of resistor R3 is connected to a 15V power supply, and the other end of resistor R3 is connected to one end of resistors R4 and R5; the other end of resistor R4 is connected to the collector of transistor V4; the other end of resistor R5 is connected to one end of resistor R6, capacitor C11, and the base of transistor V6; the other ends of resistor R6, capacitor C11, and the emitter of transistor V6 are all grounded; the collector of transistor V6 is connected to the third control module.

[0044] The third control module includes resistor R7, resistor R8, capacitor C12, capacitor C13, capacitor C14, capacitor C19, capacitor C21, MOSFET V7, and transistor V8.

[0045] One end of capacitor C12, resistor R7, capacitor C13, and the source (S) terminal of MOSFET V7 are all connected to a 15V power supply; the other end of capacitor C12, resistor R7, capacitor C13, and the gate (G) terminal of MOSFET V7 are all connected to one end of resistor R8 and capacitor C14, respectively.

[0046] The drain of MOSFET V7 is connected to one end of transistor V8. The other end of transistor V8 is connected to one end of capacitor C19 and one end of capacitor C21, respectively. The other ends of capacitors C19 and C21 are grounded.

[0047] The other ends of resistor R8 and capacitor C14 are both connected to the collector of transistor V6.

[0048] like Figure 4 As shown, the protection circuit includes transistor V1, capacitor C1, capacitor C2, and capacitor C3.

[0049] One end of transistor V1 is connected to a 15V power supply, and the other end of transistor V1 is connected to one end of capacitors C1, C2, and C3 respectively. The other ends of capacitors C1, C2, and C3 are all grounded.

[0050] This embodiment also provides a specific implementation method. Connectors XS1 and XS2 are used to connect to two external 15V power inputs: AC_PWR_IN is the main power supply, and AC_PWR_IN2 is the backup power supply.

[0051] Overvoltage protection diodes V2 and V5 are two 18V TVS overvoltage protection diodes used to protect downstream circuits.

[0052] Decoupling capacitors C1, C2, C3, C9, C11, C13, C14, C19, and C21; these capacitors are used to filter out high-frequency noise in the power supply, ensuring its stability. They are connected between the power input and ground, forming a low-pass filter.

[0053] Capacitor C12 (220pF) is a reserved filter element.

[0054] Schottky diodes V1 and V8: These diodes are used to prevent reverse current and protect the circuit from damage. They are typically connected between the power input and ground. When the power polarity is reversed, the diode conducts and bypasses the current to ground.

[0055] Transistors V4 and V6: Used for voltage comparison to control the on / off state of the PMOS transistor.

[0056] N-channel MOSFET V7: Used to control the switching on and off of backup power.

[0057] The working principle of this utility model is as follows: When the main power supply is normal, resistors R1 and R2 are used for current limiting, voltage division and biasing. When the main power supply is turned on, the base voltage of transistor V4 is divided to 1V, and transistor V4 is turned on; the base voltage of transistor V6 is 0V, and transistor V6 is turned off; the gate of V7 PMOS is at a high level, and transistor V7 is turned off, so the backup 15V power supply does not provide voltage; at this time, the main power supply provides 15V.

[0058] When the main power supply is abnormal, resistors R1 and R2 are used for current limiting, voltage division and biasing. When the main power supply is turned on, the base of transistor V4 is 0V and transistor V4 is cut off; the base voltage of transistor V6 is 1V and transistor V6 is turned on; the gate of transistor V7 PMOS is low level and transistor V7 is turned on, and the backup 15V power supply provides voltage; at this time, the backup power supply provides 15V.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0060] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

A 1.15V dual power supply input seamless switching circuit, characterized in that: Includes connector circuitry, switching circuit body, and protection circuitry; The connector circuit includes a first connector circuit and a second connector circuit; wherein, the first connector circuit and the second connector circuit are used to connect to an external 15V power input; the first connector circuit and the second connector circuit are respectively connected to the switching circuit body, and the switching circuit body is used to switch the external 15V power supply connected to the first connector circuit and the second connector circuit. The protection circuit is connected to the first connector circuit and the switching circuit body respectively. The protection circuit is used to prevent reverse power connection and protect the subsequent circuit components from being damaged by reverse voltage.

2. The 15V dual power input seamless switching circuit according to claim 1, characterized in that: The first connector circuit includes a connector XS1 and an overvoltage protection diode V2. Pins 1 and 2 of connector XS1 are connected to an external 15V power supply and pin 2 of overvoltage protection diode V2, respectively. Pins 3 and 4 of connector XS1 are connected to pin 1 of overvoltage protection diode V2. Pins 3 and 4 of connector XS1 and pin 1 of overvoltage protection diode V2 are all grounded.

3. The 15V dual power supply input seamless switching circuit according to claim 2, characterized in that: The second connector circuit includes connector XS2 and overvoltage protection diode V5; pins 1 and 2 of connector XS2 are connected to an external 15V power supply and pin 2 of overvoltage protection diode V5, respectively; pins 3 and 4 of connector XS2 are connected to pin 1 of overvoltage protection diode V5; and pins 3 and 4 of connector XS2 and pin 1 of overvoltage protection diode V5 are all grounded.

4. The 15V dual power supply input seamless switching circuit according to claim 1, characterized in that: The switching circuit body includes a first control module, a second control module, and a third control module; wherein the first control module, the second control module, and the third control module are connected in sequence for switching 15V power supply.

5. The 15V dual power supply input seamless switching circuit according to claim 4, characterized in that: The first control module includes resistor R1, resistor R2, capacitor C9, and transistor V4; One end of resistor R1 is connected to a 15V power supply, and the other end of resistor R1 is connected to resistor R2, capacitor C9 and the base of transistor V4 respectively; resistor R2, capacitor C9 and the emitter of transistor V4 are all grounded; the collector of transistor V4 is connected to the second control module.

6. The 15V dual power input seamless switching circuit according to claim 5, characterized in that: The second control module includes resistors R3, R4, R5, and R6, capacitor C11, and transistor V6. One end of resistor R3 is connected to a 15V power supply, and the other end of resistor R3 is connected to one end of resistors R4 and R5; the other end of resistor R4 is connected to the collector of transistor V4; the other end of resistor R5 is connected to one end of resistor R6, capacitor C11, and the base of transistor V6; the other ends of resistor R6, capacitor C11, and the emitter of transistor V6 are all grounded; the collector of transistor V6 is connected to the third control module.

7. The 15V dual power input seamless switching circuit according to claim 6, characterized in that: The third control module includes resistor R7, resistor R8, capacitor C12, capacitor C13, capacitor C14, capacitor C19, capacitor C21, MOSFET V7, and transistor V8. One end of capacitor C12, resistor R7, capacitor C13, and the source (S) terminal of MOSFET V7 are all connected to a 15V power supply; the other end of capacitor C12, resistor R7, capacitor C13, and the gate (G) terminal of MOSFET V7 are all connected to one end of resistor R8 and capacitor C14, respectively. The drain of MOSFET V7 is connected to one end of transistor V8. The other end of transistor V8 is connected to one end of capacitor C19 and one end of capacitor C21, respectively. The other ends of capacitors C19 and C21 are grounded. The other ends of resistor R8 and capacitor C14 are both connected to the collector of transistor V6.

8. The 15V dual power supply input seamless switching circuit according to claim 1, characterized in that: The protection circuit includes transistor V1, capacitor C1, capacitor C2, and capacitor C3; One end of transistor V1 is connected to a 15V power supply, and the other end of transistor V1 is connected to one end of capacitors C1, C2, and C3 respectively. The other ends of capacitors C1, C2, and C3 are all grounded.

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