Power supply switching circuit for switching between vehicle-mounted power supply and commercial power supply

Abstract

The utility model discloses a power supply switching circuit used for switching between a vehicle-mounted power supply and a commercial power supply. The power supply switching circuit comprises a vehicle-mounted power supply end, a commercial power supply end, a power receiving end, an electromagnetic switch K1, an electromagnetic switch K2, an electromagnetic switch K3, an electromagnetic switch K4 and a plurality of diodes. The utility model discloses a power supply switching circuit used for switching between a vehicle-mounted power supply and a commercial power supply, which is simple in structure and convenient to install, and can realize switching between power supply from a vehicle-mounted power supply end to a power receiving end and power supply from a commercial power supply end to the power receiving end without complicated electric parts.

Description

Technical Field

[0001] The utility model specifically relates to a power switching circuit for switching between in - vehicle power supply and mains power supply. Background Art

[0002] For some special - purpose vehicles, such as armed police vehicles, refrigerated trucks, etc., they need to be stationed at a certain point for a long time. When stationed, if the in - vehicle power supply is always used to supply power to the in - vehicle electrical equipment, the voltage is unstable and it will damage the in - vehicle power supply.

[0003] Therefore, when stationed, a power switching circuit is needed to switch the power supply of the electrical equipment in the vehicle from the in - vehicle power supply to the mains power supply. However, the existing power switching circuit has a complex structure. Summary of the Utility Model

[0004] In order to solve the above - mentioned technical problems, the utility model provides a power switching circuit for switching between in - vehicle power supply and mains power supply.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] The utility model discloses a power switching circuit for switching between in - vehicle power supply and mains power supply, including: an in - vehicle power supply terminal, a mains power supply terminal, a power receiving terminal, electromagnetic switches K1, K2, K3, K4, and several diodes;

[0007] The in - vehicle signal input terminal is electrically connected to the positive electrode of diode D1, the negative electrode of diode D1 is electrically connected to the intermediate node, and the in - vehicle signal input terminal is also electrically connected to one end of the coil part of electromagnetic switch K1. The other end of the coil part of electromagnetic switch K1 is electrically connected to the intermediate node;

[0008] The switch part of electromagnetic switch K1 is a three - terminal switching switch, its common terminal is electrically connected to the intermediate node, and the other two switching terminals are respectively electrically connected to one end of the coil part of electromagnetic switch K3 and one end of the coil part of electromagnetic switch K4. The other end of the coil part of electromagnetic switch K3 and the other end of the coil part of electromagnetic switch K4 are grounded;

[0009] The mains signal input terminal is electrically connected to one end of the coil part of electromagnetic switch K2, the other end of the coil part of electromagnetic switch K2 is electrically connected to the mains power supply terminal, the mains power supply terminal is also electrically connected to one end of the switch part of electromagnetic switch K2, and the other end of the switch part of electromagnetic switch K2 is electrically connected to the positive electrode of diode D2. The negative electrode of diode D2 is electrically connected to the intermediate node;

[0010] The vehicle-mounted power supply terminal is electrically connected to the positive electrode of diode D3. The negative electrode of diode D3 is electrically connected to the intermediate node. Moreover, the vehicle-mounted power supply terminal is also electrically connected to one end of the switch part of electromagnetic switch K3, and the other end of the switch part of electromagnetic switch K3 is electrically connected to the power receiving end;

[0011] The mains power supply terminal is electrically connected to one end of the switch part of electromagnetic switch K4, and the other end of the switch part of electromagnetic switch K4 is electrically connected to the power receiving end.

[0012] Based on the above technical solution, the following improvements can be made:

[0013] As a preferred solution, the switch part of electromagnetic switch K1 is a three-terminal switching switch. Its common terminal is electrically connected to the intermediate node, and the other two switching terminals are respectively a normally closed terminal and a normally open terminal. Its normally open terminal is electrically connected to one end of the coil part of electromagnetic switch K3, and its normally closed terminal is electrically connected to one end of the coil part of electromagnetic switch K4.

[0014] As a preferred solution, a diode D4 is connected in parallel at both ends of the electromagnetic part of electromagnetic switch K2. Moreover, the positive electrode of diode D4 is electrically connected to the mains signal input terminal, and the negative electrode of diode D4 is electrically connected to the mains power supply terminal.

[0015] As a preferred solution, the vehicle-mounted power supply terminal is electrically connected to the vehicle generator.

[0016] As a preferred solution, the mains power supply terminal is electrically connected to the AC electrical box.

[0017] As a preferred solution, the power receiving end is electrically connected to vehicle-mounted electrical equipment.

[0018] As a preferred solution, electromagnetic switch K1 is a relay.

[0019] As a preferred solution, electromagnetic switch K2 is a relay.

[0020] As a preferred solution, electromagnetic switch K3 is a DC contactor.

[0021] As a preferred solution, electromagnetic switch K4 is a DC contactor.

[0022] The present utility model discloses a power switching circuit for switching between a vehicle-mounted power supply and a mains power supply. Its structure is simple, the installation is convenient, and it can realize the switching between the vehicle-mounted power supply terminal supplying power to the power receiving end and the mains power supply terminal supplying power to the power receiving end without complex electrical components. Description of the Drawings

[0023] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the attached drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following attached drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant attached drawings can be obtained based on these attached drawings without creative efforts.

[0024] Figure 1 This is the circuit diagram of the power supply switching circuit provided by the embodiment of the present utility model.

[0025] Figure 2 This is the hardware schematic diagram of the power supply switching circuit provided by the embodiment of the present utility model. Specific embodiments

[0026] The preferred embodiments of the present utility model will be described in detail below in conjunction with the attached drawings.

[0027] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope protected by the present utility model.

[0028] The expression "including" an element is an "open-ended" expression, which only means the existence of the corresponding component and should not be construed as excluding additional components.

[0029] In order to achieve the purpose of the present utility model, in some embodiments of a power supply switching circuit for switching between vehicle-mounted power supply and mains power supply, as Figure 1-2 shown, the power supply switching circuit includes: a vehicle-mounted power supply terminal, a mains power supply terminal, a power receiving terminal, an electromagnetic switch K1, an electromagnetic switch K2, an electromagnetic switch K3, an electromagnetic switch K4, and several diodes;

[0030] The vehicle-mounted signal input terminal C1-2 is electrically connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is electrically connected to the intermediate node A, and the vehicle-mounted signal input terminal C1-2 is also electrically connected to one end of the coil part of the electromagnetic switch K1, and the other end of the coil part of the electromagnetic switch K1 is electrically connected to the intermediate node A;

[0031] The switch part of the electromagnetic switch K1 is a three-terminal switching switch, its common terminal is electrically connected to the intermediate node A, and the other two switching terminals are respectively electrically connected to one end of the coil part of the electromagnetic switch K3 and one end of the coil part of the electromagnetic switch K4, and the other end of the coil part of the electromagnetic switch K3 and the other end of the coil part of the electromagnetic switch K4 are grounded;

[0032] The mains power signal input terminal C1-3 is electrically connected to one end of the coil part of the electromagnetic switch K2. The other end of the coil part of the electromagnetic switch K2 is electrically connected to the mains power supply terminal. The mains power supply terminal is also electrically connected to one end of the switch part of the electromagnetic switch K2. The other end of the switch part of the electromagnetic switch K2 is electrically connected to the positive electrode of the diode D2. The negative electrode of the diode D2 is electrically connected to the intermediate node A.

[0033] The vehicle-mounted power supply terminal is electrically connected to the positive electrode of the diode D3. The negative electrode of the diode D3 is electrically connected to the intermediate node A. And the vehicle-mounted power supply terminal is also electrically connected to one end of the switch part of the electromagnetic switch K3. The other end of the switch part of the electromagnetic switch K3 is electrically connected to the power receiving end.

[0034] The mains power supply terminal is electrically connected to one end of the switch part of the electromagnetic switch K4. The other end of the switch part of the electromagnetic switch K4 is electrically connected to the power receiving end.

[0035] The grounding terminal C1-1, the vehicle-mounted signal input terminal C1-2, and the mains power signal input terminal C1-3 of the present utility model are terminals electrically connected to the vehicle-mounted control panel. And the input signals of the vehicle-mounted signal input terminal C1-2 and the mains power signal input terminal C1-3 are valid when they are at low level.

[0036] Further, the switch part of the electromagnetic switch K1 is a three-terminal switching switch. Its common terminal is electrically connected to the intermediate node. And the other two switching terminals are respectively a normally closed terminal and a normally open terminal. Its normally open terminal is electrically connected to one end of the coil part of the electromagnetic switch K3. Its normally closed terminal is electrically connected to one end of the coil part of the electromagnetic switch K4.

[0037] Further, a diode D4 is connected in parallel at both ends of the electromagnetic part of the electromagnetic switch K2. And the positive electrode of the diode D4 is electrically connected to the mains power signal input terminal. The negative electrode of the diode D4 is electrically connected to the mains power supply terminal.

[0038] The above-mentioned electromagnetic switch K1 can be, but is not limited to, a relay.

[0039] The electromagnetic switch K2 can be, but is not limited to, a relay.

[0040] The electromagnetic switch K3 can be, but is not limited to, a DC contactor.

[0041] The electromagnetic switch K4 can be, but is not limited to, a DC contactor.

[0042] Next, the working process of the present utility model will be described in several cases.

[0043] First, when there is power at the vehicle-mounted power supply terminal and no power at the mains power supply terminal:

[0044] 1) When there is a low-level input signal at the vehicle-mounted signal input terminal C1-2 and no input signal at the mains power signal input terminal C1-3:

[0045] The coil part of electromagnetic switch K1 is energized, the normally open end of the switch part of electromagnetic switch K1 closes, the coil part of electromagnetic switch K3 is energized, the switch part of electromagnetic switch K3 closes, the coil part of electromagnetic switch K2 is not energized, the switch part of electromagnetic switch K2 opens, the coil part of electromagnetic switch K4 is energized, the switch part of electromagnetic switch K4 closes, and the vehicle-mounted power supply terminal successfully supplies power to the power receiving terminal.

[0046] 2) When there is a low-level input signal at the vehicle-mounted signal input terminal C1-2 and a low-level input signal at the mains signal input terminal C1-3:

[0047] The coil part of electromagnetic switch K1 is energized, the normally open end of the switch part of electromagnetic switch K1 closes, the coil part of electromagnetic switch K3 is energized, the switch part of electromagnetic switch K3 closes, the coil part of electromagnetic switch K2 is not energized, the switch part of electromagnetic switch K2 opens, the coil part of electromagnetic switch K4 is energized, the switch part of electromagnetic switch K4 closes, and the vehicle-mounted power supply terminal successfully supplies power to the power receiving terminal.

[0048] 3) When there is no input signal at the vehicle-mounted signal input terminal C1-2 and a low-level input signal at the mains signal input terminal C1-3:

[0049] The coil part of electromagnetic switch K1 is not energized, the normally closed end of the switch part of electromagnetic switch K1 closes, the coil part of electromagnetic switch K4 is energized, the switch part of electromagnetic switch K4 closes, the coil part of electromagnetic switch K2 is not energized, the switch part of electromagnetic switch K2 opens, the coil part of electromagnetic switch K3 is not energized, the switch part of electromagnetic switch K3 opens, and the power receiving terminal has no power.

[0050] 4) When there is no input signal at the vehicle-mounted signal input terminal C1-2 and no input signal at the mains signal input terminal C1-3:

[0051] The coil part of electromagnetic switch K1 is not energized, the normally closed end of the switch part of electromagnetic switch K1 closes, the coil part of electromagnetic switch K4 is energized, the switch part of electromagnetic switch K4 closes, the coil part of electromagnetic switch K2 is not energized, the switch part of electromagnetic switch K2 opens, the coil part of electromagnetic switch K3 is not energized, the switch part of electromagnetic switch K3 opens, and the power receiving terminal has no power.

[0052] Second, the vehicle-mounted power supply terminal has no power and the mains power supply terminal has power:

[0053] 1) When there is a low-level input signal at the vehicle-mounted signal input terminal C1-2 and no input signal at the mains signal input terminal C1-3:

[0054] The coil part of electromagnetic switch K1 has no power, the normally closed end of the switch part of electromagnetic switch K1 is closed, the coil part of electromagnetic switch K2 has no power, the switch part of electromagnetic switch K2 is open, the coil part of electromagnetic switch K3 has no power, the switch part of electromagnetic switch K3 is open, the coil part of electromagnetic switch K4 has no power, the switch part of electromagnetic switch K4 is open, and the power receiving end has no power.

[0055] 2) When there is a low-level input signal at the vehicle-mounted signal input terminal C1-2 and a low-level input signal at the mains signal input terminal C1-3:

[0056] The coil part of electromagnetic switch K1 is powered on, the normally open end of the switch part of electromagnetic switch K1 is closed, the coil part of electromagnetic switch K3 is powered on, the switch part of electromagnetic switch K3 is closed, the coil part of electromagnetic switch K2 is powered on, the switch part of electromagnetic switch K2 is closed, the coil part of electromagnetic switch K4 has no power, the switch part of electromagnetic switch K4 is open, and the power receiving end has no power.

[0057] 3) When there is no input signal at the vehicle-mounted signal input terminal C1-2 and a low-level input signal at the mains signal input terminal C1-3:

[0058] The coil part of electromagnetic switch K1 has no power, the normally closed end of the switch part of electromagnetic switch K1 is closed, the coil part of electromagnetic switch K4 is powered on, the switch part of electromagnetic switch K4 is closed, the coil part of electromagnetic switch K2 has no power, the switch part of electromagnetic switch K2 is open, the coil part of electromagnetic switch K3 has no power, the switch part of electromagnetic switch K3 is open, and the mains power supply terminal supplies power to the power receiving end successfully.

[0059] 4) When there is no input signal at the vehicle-mounted signal input terminal C1-2 and no input signal at the mains signal input terminal C1-3:

[0060] The coil part of electromagnetic switch K1 has no power, the normally closed end of the switch part of electromagnetic switch K1 is closed, the coil part of electromagnetic switch K2 has no power, the switch part of electromagnetic switch K2 is open, the coil part of electromagnetic switch K3 has no power, the switch part of electromagnetic switch K3 is open, the coil part of electromagnetic switch K4 has no power, the switch part of electromagnetic switch K4 is open, and the power receiving end has no power.

[0061] Third, the vehicle-mounted power supply terminal has power and the mains power supply terminal has power:

[0062] 1) When there is a low-level input signal at the vehicle-mounted signal input terminal C1-2 and no input signal at the mains signal input terminal C1-3: The coil part of electromagnetic switch K1 is powered on, the normally open end of the switch part of electromagnetic switch K1 is closed, the coil part of electromagnetic switch K3 is powered on, the switch part of electromagnetic switch K3 is closed, the coil part of electromagnetic switch K2 has no power, the switch part of electromagnetic switch K2 is open, the coil part of electromagnetic switch K4 has no power, the switch part of electromagnetic switch K4 is open, and the vehicle-mounted power supply terminal supplies power to the power receiving end successfully.

[0063] 2) When there is a low - level input signal at the vehicle - mounted signal input terminal C1 - 2 and a low - level input signal at the mains signal input terminal C1 - 3:

[0064] The coil part of the electromagnetic switch K1 is energized, the normally open end of the switch part of the electromagnetic switch K1 is closed, the coil part of the electromagnetic switch K3 is energized, the switch part of the electromagnetic switch K3 is closed, the coil part of the electromagnetic switch K2 is energized, the switch part of the electromagnetic switch K2 is closed, the coil part of the electromagnetic switch K4 is not energized, the switch part of the electromagnetic switch K4 is open, and the vehicle - mounted power supply end successfully supplies power to the power - receiving end.

[0065] 3) When there is no input signal at the vehicle - mounted signal input terminal C1 - 2 and a low - level input signal at the mains signal input terminal C1 - 3:

[0066] The coil part of the electromagnetic switch K1 is not energized, the normally closed end of the switch part of the electromagnetic switch K1 is closed, the coil part of the electromagnetic switch K4 is energized, the switch part of the electromagnetic switch K4 is closed, the coil part of the electromagnetic switch K2 is energized, the switch part of the electromagnetic switch K2 is closed, the coil part of the electromagnetic switch K3 is not energized, the switch part of the electromagnetic switch K3 is open, and the mains power supply end successfully supplies power to the power - receiving end.

[0067] 4) When there is no input signal at the vehicle - mounted signal input terminal C1 - 2 and no input signal at the mains signal input terminal C1 - 3:

[0068] The coil part of the electromagnetic switch K1 is not energized, the normally closed end of the switch part of the electromagnetic switch K1 is closed, the coil part of the electromagnetic switch K2 is not energized, the switch part of the electromagnetic switch K2 is open, the coil part of the electromagnetic switch K3 is not energized, the switch part of the electromagnetic switch K3 is open, the coil part of the electromagnetic switch K4 is energized, the switch part of the electromagnetic switch K4 is closed, and the mains power supply end successfully supplies power to the power - receiving end.

[0069] The utility model forms an interlock for the vehicle - mounted power supply (i.e., the vehicle - mounted power supply end) and the mains power supply (i.e., the mains power supply end) through the low - level signal given by the control panel, and only one way of power supply is available. And the utility model gives priority to the mains power supply state for power supply.

[0070] In order to further optimize the implementation effect of the utility model, in some other embodiments, the remaining characteristic technologies are the same, and the difference is that the vehicle - mounted power supply end is electrically connected to the vehicle's generator.

[0071] In order to further optimize the implementation effect of the utility model, in some other embodiments, the remaining characteristic technologies are the same, and the difference is that the mains power supply end is electrically connected to the AC electrical box. Among them: the AC electrical box is internally provided with an AC - DC conversion circuit, etc.

[0072] In order to further optimize the implementation effect of the present utility model, in some other embodiments, the remaining characteristic technologies are the same, and the difference lies in that the power receiving end is electrically connected to an in-vehicle electrical device. Among them: the in-vehicle electrical device can be, but is not limited to, an air conditioner, an audio and video device, etc.

[0073] The present utility model discloses a power switching circuit for switching between an in-vehicle power supply and a mains power supply. It has a simple structure and is convenient to install. Without complex electrical components, it can realize the switching between the in-vehicle power supply end supplying power to the power receiving end and the mains power supply end supplying power to the power receiving end.

[0074] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

[0075] The control mode of the present utility model is controlled by manually starting and closing a switch. The wiring diagram of the power element and the power supply are common knowledge in the art, and the present utility model is mainly used to protect mechanical devices, so the control mode and wiring layout of the present utility model will not be further explained.

Claims

1. A power switching circuit for switching between in-vehicle power supply and mains power supply, characterized in that, Comprising: A vehicle-mounted power supply terminal, a mains power supply terminal, a power receiving terminal, an electromagnetic switch K1, an electromagnetic switch K2, an electromagnetic switch K3, an electromagnetic switch K4, and several diodes; The vehicle-mounted signal input terminal is electrically connected to the positive electrode of diode D1, the negative electrode of diode D1 is electrically connected to the intermediate node, and the vehicle-mounted signal input terminal is also electrically connected to one end of the coil part of electromagnetic switch K1, and the other end of the coil part of electromagnetic switch K1 is electrically connected to the intermediate node; The switch part of electromagnetic switch K1 is a three-terminal switching switch, its common terminal is electrically connected to the intermediate node, and the other two switching terminals are respectively electrically connected to one end of the coil part of electromagnetic switch K3 and one end of the coil part of electromagnetic switch K4, and the other end of the coil part of electromagnetic switch K3 and the other end of the coil part of electromagnetic switch K4 are grounded; The mains power signal input terminal is electrically connected to one end of the coil part of electromagnetic switch K2, the other end of the coil part of electromagnetic switch K2 is electrically connected to the mains power supply terminal, the mains power supply terminal is also electrically connected to one end of the switch part of electromagnetic switch K2, and the other end of the switch part of electromagnetic switch K2 is electrically connected to the positive electrode of diode D2, and the negative electrode of diode D2 is electrically connected to the intermediate node; The vehicle-mounted power supply terminal is electrically connected to the positive electrode of diode D3, the negative electrode of diode D3 is electrically connected to the intermediate node, and the vehicle-mounted power supply terminal is also electrically connected to one end of the switch part of electromagnetic switch K3, and the other end of the switch part of electromagnetic switch K3 is electrically connected to the power receiving terminal; The mains power supply terminal is electrically connected to one end of the switch part of electromagnetic switch K4, and the other end of the switch part of electromagnetic switch K4 is electrically connected to the power receiving terminal.

2. The power supply switching circuit according to claim 1, wherein The switch part of electromagnetic switch K1 is a three-terminal switching switch, its common terminal is electrically connected to the intermediate node, and the other two switching terminals are respectively a normally closed terminal and a normally open terminal, its normally open terminal is electrically connected to one end of the coil part of electromagnetic switch K3, and its normally closed terminal is electrically connected to one end of the coil part of electromagnetic switch K4.

3. The power supply switching circuit according to claim 1, wherein A diode D4 is connected in parallel at both ends of the electromagnetic part of electromagnetic switch K2, and the positive electrode of diode D4 is electrically connected to the mains power signal input terminal, and the negative electrode of diode D4 is electrically connected to the mains power supply terminal.

4. The power supply switching circuit according to claim 1, wherein The vehicle-mounted power supply terminal is electrically connected to the vehicle generator.

5. The power supply switching circuit according to claim 1, characterized in that The mains power supply terminal is electrically connected to the AC electrical box.

6. The power supply switching circuit according to claim 1, wherein The power receiving terminal is electrically connected to the vehicle-mounted electrical equipment.

7. The power supply switching circuit according to claim 1, wherein Electromagnetic switch K1 is a relay.

8. The power supply switching circuit according to claim 1, wherein Electromagnetic switch K2 is a relay.

9. The power supply switching circuit according to claim 1, wherein Electromagnetic switch K3 is a DC contactor.

10. The power supply switching circuit according to claim 1, characterized in that, Electromagnetic switch K4 is a DC contactor.

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