Power change-over switch circuit

Abstract

According to the power supply change-over switch circuit provided by the utility model, through the level selection module, different power supply inputs are selected based on the first control signal, and stable power supply switching is realized; and then the output switch module controls the transmission of the pre-output voltage based on the second control signal, power is supplied to the external load only when needed, the power consumption is reduced, and false triggering is avoided. The power change-over switch circuit provided by the utility model can meet the output requirements of two levels on the same connector, has simple and clear control logic, ensures stable and reliable output, and avoids the situation that the two levels are output at the same time. Meanwhile, according to the scheme, the flexibility of the power distribution controller for outputting the level on the same connector can be improved, the universality of parts is enhanced, the power distribution controller is suitable for various application scenes, and the compatibility and adaptability of a system are improved.

Description

Technical Field

[0001] This utility model relates to the field of power distribution circuit technology, and in particular to a power switching circuit. Background Technology

[0002] In electronic devices, switching between multiple power sources is often necessary to ensure system stability and reliability. For example, in portable devices, industrial control systems, or server power management, different power sources need to be selected based on different operating states to improve system adaptability and battery life. However, existing power switching solutions often have the following problems: the controller's output power level is predetermined during manufacturing, resulting in relatively low component flexibility and an inability to control the selection; or the controller needs to strictly control two different control signals, otherwise crosstalk may occur in the output levels, easily causing logical confusion when the control signals are uncontrollable.

[0003] In summary, the shortcomings of the existing technology urgently need to be addressed. Utility Model Content

[0004] This utility model provides a power switching circuit to overcome the deficiencies in the prior art and realize intelligent power switching and intelligent control of load power supply.

[0005] This utility model provides a power switching circuit, including: a power input module, a level selection module, and an output switch module;

[0006] The power input module is used to provide a source for the pre-output voltage;

[0007] The level selection module is used to select the source of the pre-output voltage according to the first control signal;

[0008] The output switch module is used to select the transmission of the pre-output voltage according to the second control signal. When the second control signal is high, the output switch module outputs the pre-output voltage to the external load.

[0009] The output terminal of the power input module is connected to the input terminal of the level selection module, and the output terminal of the level selection module is connected to the input terminal of the output switch module.

[0010] According to the present invention, a power switching circuit is provided, wherein the level selection module includes a first switching circuit and a second switching circuit;

[0011] When the first control signal is high, the first switching circuit is turned on, obtains voltage from the first power supply, and outputs the pre-output voltage.

[0012] When the first control signal is low, the second switching circuit is turned on, obtains voltage from the second power supply, and outputs the pre-output voltage.

[0013] According to the present invention, a power switching circuit is provided, wherein the output switching module includes a third switching circuit and a fourth switching circuit;

[0014] When the second control signal is high, the third switching circuit is turned on, so that the pre-output voltage is transmitted to the external load;

[0015] When the second control signal is low, the fourth switching circuit is turned off, preventing the pre-output voltage from being output to the external load.

[0016] According to the present invention, a power switching circuit is provided, wherein both the first switching circuit and the second switching circuit include transistors and voltage divider resistors, and the voltage divider resistors are used to adjust the level of the pre-output voltage so as to meet the requirements of the external load.

[0017] According to the present invention, a power switching circuit is provided, wherein the first switching circuit includes a first isolation element and the second switching circuit includes a second isolation element;

[0018] The first isolation element is used to prevent current from the first power supply from flowing back to the second power supply;

[0019] The second isolation element is used to prevent current from the second power supply from flowing back to the first power supply.

[0020] According to the power switching circuit provided by this utility model, the level selection module further includes a protection circuit, which includes a current-limiting resistor and a clamping diode.

[0021] The protection circuit is used to limit the amplitude of the input signal to prevent sudden changes in the input signal from damaging the power switching circuit.

[0022] According to the present invention, a power switching circuit is provided, wherein the power input module includes a first power input terminal and a second power input terminal, both of which are connected to a common ground terminal.

[0023] The power switching circuit provided by this invention selects different power inputs based on a first control signal through a level selection module, achieving stable power switching. Then, the output switch module controls the transmission of the pre-output voltage based on a second control signal, supplying power to the external load only when needed, reducing power consumption and preventing false triggering. This power switching circuit can meet the output requirements of two different levels on the same connector, has simple and clear control logic, ensures stable and reliable output, and prevents simultaneous output of two different levels. Furthermore, this solution improves the flexibility of the power distribution controller's output level on the same connector, enhances the versatility of components, is suitable for various application scenarios, and improves system compatibility and adaptability. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the power switching circuit provided by this utility model.

[0026] Figure 2 This is a circuit diagram of the power switching circuit provided by this utility model. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] To address the problems in the existing technology, this utility model proposes a power switching circuit to achieve intelligent power switching and intelligent control of load power supply. The power switching circuit is described below, as follows: Figure 1 and Figure 2 As shown, including but not limited to the following modules:

[0029] Power input module, level selection module, and output switch module;

[0030] The power input module is used to provide a source for the pre-output voltage;

[0031] The level selection module is used to select the source of the pre-output voltage according to the first control signal;

[0032] The output switch module is used to select the transmission of the pre-output voltage according to the second control signal. When the second control signal is high, the output switch module outputs the pre-output voltage to the external load.

[0033] The output terminal of the power input module is connected to the input terminal of the level selection module, and the output terminal of the level selection module is connected to the input terminal of the output switch module.

[0034] This invention provides a power switching circuit, including a power input module, a level selection module, and an output switch module. The working principle of each module and their connection relationships are explained in detail below with reference to the component symbols in the circuit diagram.

[0035] 1. Power input module

[0036] The power input module is used to provide the source of the pre-output voltage, including a first power input terminal (VCC1) and a second power input terminal (VCC2), which are power input terminals with different voltages.

[0037] VCC1 and VCC2 are two different power supplies used to provide selectable voltage sources.

[0038] The common ground terminal (GND) is connected to the entire circuit and serves as a reference point for all power supplies.

[0039] 2. Level Selection Module

[0040] The level selection module is used to select the source of the pre-output voltage based on the high or low level of the first control signal (CONTROL1). The main components of this module include:

[0041] First switching circuit (Q1, Q2): When CONTROL1 is high, Q2 (NPN transistor) is turned on, which in turn turns on Q1 (PNP transistor), thus selecting VCC1 as the source of the pre-output voltage.

[0042] The second switching circuit (Q3, Q4): When CONTROL1 is low, Q2 is not turned on, which in turn turns on Q4 (PNP transistor) and Q3 (PNP transistor), thus selecting VCC2 as the source of the pre-output voltage.

[0043] Voltage divider resistors (R6, R7): Used to adjust the output voltage to meet the load requirements and to ensure that there is no conflict between power supplies when switching between different levels.

[0044] Isolation diodes (D1, D2): Used to prevent current backflow and ensure that VCC1 and VCC2 do not interfere with each other.

[0045] In this module, the pre-output voltage (V2) is provided by the selected power supply (VCC1 or VCC2) and protected by isolation diodes (D1, D2).

[0046] 3. Output switch module

[0047] The output switch module determines whether to transmit the pre-output voltage (V2) to the external load based on the high or low level of the second control signal (CONTROL2). The main components of this module include:

[0048] Third switching circuit (Q5, Q6):

[0049] When CONTROL2 is high, Q6 (NPN transistor) turns on, which in turn turns on Q5 (PNP transistor), and the V2 voltage is output to the external load.

[0050] When CONTROL2 is low, Q6 is off, Q5 is also off, and V2 cannot be transmitted to the external load.

[0051] 4. Connection relationships between modules

[0052] The power input module provides two power inputs, VCC1 and VCC2, which are connected to the input terminals of the level selection module.

[0053] The level selection module selects VCC1 or VCC2 as the pre-output voltage V2 based on the CONTROL1 signal and transmits V2 to the input terminal of the output switch module.

[0054] The output switch module determines whether to transmit V2 to an external load based on the CONTROL2 signal.

[0055] 5. Specific Work Process

[0056] When CONTROL1 is high, VCC1 is selected as the pre-output voltage V2; when CONTROL1 is low, VCC2 is selected as the pre-output voltage V2.

[0057] When CONTROL2 is high, Q5 and Q6 are turned on, and the pre-output voltage V2 is transmitted to the external load; when CONTROL2 is low, Q5 and Q6 are turned off, and V2 is not transmitted to the external load.

[0058] This circuit uses two control signals, CONTROL1 and CONTROL2, to achieve highly reliable control over power selection and output, ensuring the two output levels required on the same connector while avoiding conflicts and interference between different power supplies, thus ensuring the stability and safety of system operation.

[0059] According to the present invention, a power switching circuit is provided, wherein the level selection module includes a first switching circuit and a second switching circuit;

[0060] When the first control signal is high, the first switching circuit is turned on, obtains voltage from the first power supply, and outputs the pre-output voltage.

[0061] When the first control signal is low, the second switching circuit is turned on, obtains voltage from the second power supply, and outputs the pre-output voltage.

[0062] The core of this power switching circuit lies in the level selection module, which determines which power source to draw voltage from. Specifically:

[0063] When the first control signal (CONTROL1) is high:

[0064] The first switching circuit is turned on, and voltage is obtained from the first power supply (VCC1).

[0065] Specifically:

[0066] When CONTROL1 is high, Q2 (NPN transistor) is turned on, which in turn turns on Q1 (PNP transistor).

[0067] VCC1 is transmitted to the circuit's output terminal (V2) through Q1 as the pre-output voltage.

[0068] Meanwhile, since Q2 is turned on, Q4 (the NPN transistor in the second switching circuit) is in the off state, ensuring that VCC2 will not enter the output.

[0069] When the first control signal (CONTROL1) is low:

[0070] The second switching circuit is turned on, and voltage is obtained from the second power supply (VCC2).

[0071] Specifically:

[0072] When CONTROL1 is low, Q2 is turned off, which in turn causes Q1 to turn off as well, thus cutting off the path of VCC1.

[0073] At the same time, Q4 turns on, which in turn turns on Q3 (PNP transistor), so that VCC2 is output to V2 through Q3 as the pre-output voltage.

[0074] According to the present invention, a power switching circuit is provided, wherein the output switching module includes a third switching circuit and a fourth switching circuit;

[0075] When the second control signal is high, the third switching circuit is turned on, so that the pre-output voltage is transmitted to the external load;

[0076] When the second control signal is low, the fourth switching circuit is turned off, preventing the pre-output voltage from being output to the external load.

[0077] The output switch module in the power switching circuit provided by this utility model is used to control whether the pre-output voltage is transmitted to the external load. Its core lies in the cooperation of the third switch circuit and the fourth switch circuit.

[0078] When the second control signal (CONTROL2) is high, the third switching circuit is turned on, so that the pre-output voltage (V2) is transmitted to the external load.

[0079] When the second control signal (CONTROL2) is low, the fourth switching circuit is turned off, preventing the pre-output voltage from being transmitted to the external load and preventing erroneous output.

[0080] Specifically, when CONTROL2 is high (output is on).

[0081] CONTROL2 turns on Q5 (NPN transistor), which in turn drives Q6 (PNP transistor) to turn on.

[0082] The pre-output voltage V2 is transmitted to the output terminal (Vout) through Q6 and provided to the external load.

[0083] When CONTROL2 is low (output cut off)

[0084] CONTROL2 causes Q5 to be cut off, which in turn causes Q6 to also be cut off.

[0085] At this time, V2 cannot be transmitted to Vout, ensuring no erroneous output and protecting the load device.

[0086] The fourth switch circuit (Q6 cut off) prevents leakage and ensures that the load will not be accidentally energized when it is not in operation.

[0087] Current-limiting resistors (R8, R9) are used to control the base current, prevent transistor overload, and improve reliability.

[0088] According to the present invention, a power switching circuit is provided, wherein both the first switching circuit and the second switching circuit include transistors and voltage divider resistors, and the voltage divider resistors are used to adjust the level of the pre-output voltage so as to meet the requirements of the external load.

[0089] The level selection module in the power switching circuit provided by this utility model is used to select the source of the pre-output voltage according to the first control signal (CONTROL1), and adjust the voltage through the voltage divider resistor to make it meet the level requirements of the external load.

[0090] The first switching circuit and the second switching circuit switch between the first power supply (VCC1) and the second power supply (VCC2).

[0091] The output voltage is adjusted by a voltage divider resistor network to ensure that the external load receives the appropriate operating voltage.

[0092] Specifically,

[0093] (1) When CONTROL1 is high (select the first power supply VCC1)

[0094] CONTROL1 turns on Q1 (NPN transistor), connecting it to VCC1, and outputs the pre-output voltage V2.

[0095] A current-limiting resistor R1 is connected in series with the base of Q1 to prevent overcurrent from damaging the transistor.

[0096] VCC1 is transmitted to V2 through the collector-emitter path of Q1. At the same time, the voltage divider network composed of R3 and R4 adjusts the output voltage.

[0097] (2) When CONTROL1 is low (select the second power supply VCC2)

[0098] CONTROL1 turns off Q1, while Q3 (PNP transistor) turns on, drawing voltage from VCC2 and outputting it to V2.

[0099] A current-limiting resistor R9 is also connected in series with the base of Q3 to limit the current and protect the device.

[0100] VCC2 is transferred to V2 via the collector-emitter path of Q3.

[0101] According to the present invention, a power switching circuit is provided, wherein the first switching circuit includes a first isolation element and the second switching circuit includes a second isolation element;

[0102] The first isolation element is used to prevent current from the first power supply from flowing back to the second power supply;

[0103] The second isolation element is used to prevent current from the second power supply from flowing back to the first power supply.

[0104] The level selection module of this utility model includes a first switching circuit and a second switching circuit, wherein a first isolation element and a second isolation element are respectively provided to prevent current backflow between the two power supplies and improve the stability and reliability of power switching.

[0105] First isolation element (D1): Prevents current from the first power supply (VCC1) from flowing back to the second power supply (VCC2).

[0106] Second isolation element (D2): Prevents current from the second power supply (VCC2) from flowing back to the first power supply (VCC1).

[0107] Specifically,

[0108] (1) When CONTROL1 is high (select the first power supply VCC1)

[0109] CONTROL1 turns on Q1 (NPN transistor), and VCC1 outputs the pre-output voltage V2 through Q1.

[0110] The second isolation element D2 (e.g., a Schottky diode) is forward-biased, allowing VCC1 to pass through, but preventing any current from V2 from flowing back to VCC2.

[0111] At this time, Q3 is in the cutoff state, D2 is reverse biased and not conducting, and VCC2 will not affect V2.

[0112] (2) When CONTROL1 is low (select the second power supply VCC2)

[0113] CONTROL1 turns on Q2 (PNP transistor), and VCC2 outputs the pre-output voltage V2 via Q3.

[0114] The first isolation element D1 (e.g., a Schottky diode) is forward-biased, allowing VCC2 to pass through, but preventing any current from V2 from flowing back to VCC1.

[0115] At this time, Q1 is in the cutoff state, D1 is reverse biased and not conducting, and VCC1 will not affect V2.

[0116] According to the power switching circuit provided by this utility model, the level selection module further includes a protection circuit, which includes a current-limiting resistor and a clamping diode.

[0117] The protection circuit is used to limit the amplitude of the input signal to prevent sudden changes in the input signal from damaging the power switching circuit.

[0118] The level selection module of this invention includes a protection circuit to prevent sudden changes in the input signal from damaging the circuit and to improve the stability and reliability of the system. This protection circuit mainly consists of a current-limiting resistor and a clamping diode (not shown in the figure) to ensure that the amplitude of the input signal does not exceed the safe range.

[0119] Current-limiting resistors (R1, R2): limit the current of the input signal to reduce the impact of sudden current on the circuit.

[0120] Specifically,

[0121] (1) Protection mechanism when the input signal is too high

[0122] When the voltage of the first control signal (CONTROL1) or the second control signal (CONTROL2) is too high (exceeding the power supply voltage, such as VCC1 or VCC2), the current-limiting resistor R1 can limit the current and prevent overcurrent damage to the diode.

[0123] (2) Protection mechanism when the input signal is too low

[0124] When the input signal voltage is too low (below GND, such as generating a negative voltage), the low voltage is limited to a safe range to avoid damage to the circuit.

[0125] The current-limiting resistor R2 can limit the current and prevent excessive current from damaging the diode or control circuit.

[0126] According to the present invention, a power switching circuit is provided, wherein the power input module includes a first power input terminal and a second power input terminal, both of which are connected to a common ground terminal.

[0127] In the power switching circuit provided by this utility model, the power input module is used to provide a source of pre-output voltage so that the level selection module can perform power switching. This module includes a first power input terminal and a second power input terminal, both of which are connected to a common ground terminal (GND) to ensure system stability and compatibility.

[0128] First power input terminal (VCC1): Provides the first power input, and the voltage range can be set according to the specific application (such as 3.3V, 5V or 12V).

[0129] Second power input terminal (VCC2): Provides a second power input, which is usually different from the voltage of VCC1, so as to switch it for different needs.

[0130] Common ground (GND): Serves as the potential reference for the entire circuit, ensuring that the potentials of all modules in the circuit are consistent and avoiding floating voltage or ground loop problems.

[0131] The first power input terminal (VCC1) is connected to the first switching circuit to provide it with input voltage.

[0132] The second power input terminal (VCC2) is connected to the second switching circuit to provide it with input voltage.

[0133] The common ground terminal (GND) is connected to the first power input terminal, the second power input terminal, and other modules of the entire circuit, such as the level selection module and the output switch module, to maintain the same potential reference and prevent malfunction.

[0134] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A power switching circuit, characterized in that, include: Power input module, level selection module, and output switch module; The power input module is used to provide a source for the pre-output voltage; The level selection module is used to select the source of the pre-output voltage according to the first control signal; The output switch module is used to select the transmission of the pre-output voltage according to the second control signal. When the second control signal is high, the output switch module outputs the pre-output voltage to the external load. The output terminal of the power input module is connected to the input terminal of the level selection module, and the output terminal of the level selection module is connected to the input terminal of the output switch module.

2. The power switcher circuit according to claim 1, wherein The level selection module includes a first switching circuit and a second switching circuit; When the first control signal is high, the first switching circuit is turned on, obtains voltage from the first power supply, and outputs the pre-output voltage. When the first control signal is low, the second switching circuit is turned on, obtains voltage from the second power supply, and outputs the pre-output voltage.

3. The power switcher circuit according to claim 1, wherein The output switch module includes a third switch circuit and a fourth switch circuit; When the second control signal is high, the third switching circuit is turned on, so that the pre-output voltage is transmitted to the external load; When the second control signal is low, the fourth switching circuit is turned off, preventing the pre-output voltage from being output to the external load.

4. The power switcher circuit according to claim 2, wherein Both the first and second switching circuits include transistors and voltage divider resistors. The voltage divider resistors are used to adjust the level of the pre-output voltage to meet the requirements of the external load.

5. The power switcher circuit according to claim 4, wherein The first switching circuit includes a first isolation element, and the second switching circuit includes a second isolation element; The first isolation element is used to prevent current from the first power supply from flowing back to the second power supply; The second isolation element is used to prevent current from the second power supply from flowing back to the first power supply.

6. The power switcher circuit according to claim 1, wherein The level selection module also includes a protection circuit, which includes a current-limiting resistor and a clamping diode. The protection circuit is used to limit the amplitude of the input signal to prevent sudden changes in the input signal from damaging the power switching circuit.

7. The power switcher circuit according to claim 1, wherein The power input module includes a first power input terminal and a second power input terminal, both of which are connected to a common ground terminal.

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