CN222262236U - Power supply switching circuit, power supply circuit and automobile alternating-current charging pile - Google Patents
Power supply switching circuit, power supply circuit and automobile alternating-current charging pile Download PDFInfo
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- CN222262236U CN222262236U CN202420443789.7U CN202420443789U CN222262236U CN 222262236 U CN222262236 U CN 222262236U CN 202420443789 U CN202420443789 U CN 202420443789U CN 222262236 U CN222262236 U CN 222262236U
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Abstract
本实用新型公开一种电源切换电路、供电电路及汽车交流充电桩，其中，电源切换电路应用于汽车交流充电桩，汽车交流充电桩包括主控电路，电源切换电路包括：电源电路，电源电路用于输出第一电压；稳压电路，稳压电路的输入端与电源电路的输出端电连接，稳压电路用于将输入的第一电压进行稳压处理后输出；滤波电路，滤波电路的输入端与稳压电路的输出端电连接，滤波电路的输出端与主控电路的电源输入端电连接，滤波电路用于将经稳压处理输出后的第二电压进行滤波处理后输出至主控电路。本实用新型旨在提高汽车交流充电桩断电时的临时供电能力。
The utility model discloses a power switching circuit, a power supply circuit and an AC charging pile for automobiles, wherein the power switching circuit is applied to the AC charging pile for automobiles, the AC charging pile for automobiles comprises a main control circuit, and the power switching circuit comprises: a power circuit, the power circuit is used to output a first voltage; a voltage stabilizing circuit, the input end of the voltage stabilizing circuit is electrically connected to the output end of the power circuit, the voltage stabilizing circuit is used to output the input first voltage after voltage stabilization processing; a filter circuit, the input end of the filter circuit is electrically connected to the output end of the voltage stabilizing circuit, the output end of the filter circuit is electrically connected to the power input end of the main control circuit, the filter circuit is used to output the second voltage after voltage stabilization processing to the main control circuit after filtering processing. The utility model aims to improve the temporary power supply capacity of the AC charging pile for automobiles when the power is cut off.
Description
Technical Field
The utility model relates to the technical field of power management, in particular to a power switching circuit, a power supply circuit and an automobile alternating current charging pile.
Background
In many existing automobile alternating-current charging piles, when commercial power is cut off, the automobile cannot be charged, and a user cannot be informed that the current charging pile is in a power-off state, and the automobile cannot acquire electric energy. When the user considers that the automobile is charged for a plurality of hours, the electric quantity of the automobile at the moment is found to be not expected when the automobile is enough to run. This will disturb the travel plan of the user and bring a very poor use experience to the user. Therefore, it is particularly important how to feed back the information to the user in time and stably when the mains supply is cut off.
Disclosure of utility model
The utility model mainly aims to provide a power supply switching circuit which aims to improve temporary power supply capacity of an automobile alternating-current charging pile when power is off.
In order to achieve the above object, the present utility model provides a power switching circuit, which is applied to an automobile ac charging pile, the automobile ac charging pile includes a main control circuit, the power switching circuit includes:
A power supply circuit for outputting a first voltage;
The input end of the voltage stabilizing circuit is electrically connected with the output end of the power supply circuit, and the voltage stabilizing circuit is used for stabilizing the input first voltage and outputting the first voltage;
The input end of the filter circuit is electrically connected with the output end of the voltage stabilizing circuit, the output end of the filter circuit is electrically connected with the power input end of the main control circuit, and the filter circuit is used for carrying out filter processing on the second voltage which is output after the voltage stabilizing processing and outputting the second voltage to the main control circuit.
Preferably, the power supply circuit includes:
a power supply battery;
The input end of the capacitor circuit is electrically connected with the output end of the power supply battery, the output end of the capacitor circuit is electrically connected with the voltage stabilizing circuit, and the capacitor circuit is used for providing instantaneous heavy current.
Preferably, the capacitor circuit comprises a first capacitor and a second capacitor;
The first end of the first capacitor is electrically connected with the output end of the battery and the input end of the voltage stabilizing circuit, the second end of the first capacitor is electrically connected with the second end of the second capacitor, and the second end of the second capacitor is electrically connected with the output end of the battery, the input end of the voltage stabilizing circuit and the ground end.
Preferably, the voltage stabilizing circuit comprises a third capacitor, a first inductor and a voltage stabilizing chip;
The first end of the third capacitor is electrically connected with the output end of the battery, the first end of the first capacitor, the first end of the first inductor, the BAT pin and the EN pin of the voltage stabilizing chip, the second end of the third capacitor is electrically connected with the second end of the second capacitor, the output end of the battery and the grounding end, and the second end of the first inductor is electrically connected with the SW pin of the voltage stabilizing chip.
Preferably, the filter circuit comprises a fourth capacitor, a fifth capacitor and a sixth capacitor;
The first end of the fourth capacitor is electrically connected with the OUT pin of the voltage stabilizing chip, the first end of the fifth capacitor, the first end of the sixth capacitor and the main control circuit, and the second end of the fourth capacitor is electrically connected with the second end of the fifth capacitor, the second end of the sixth capacitor and the grounding end.
Preferably, the power supply switching circuit further comprises a clamping circuit, wherein an input end of the clamping circuit is electrically connected with an output end of the filtering circuit, and the clamping circuit is used for limiting the output voltage below a preset threshold voltage.
Preferably, the power supply switching circuit further comprises a prompting circuit, wherein the input end of the prompting circuit is electrically connected with the output end of the voltage stabilizing circuit, and the prompting circuit is used for outputting a prompting signal when the power supply switching circuit is in a working state.
The utility model also proposes a power supply circuit comprising a power switching circuit as described in any one of the above.
Preferably, the power supply circuit further comprises a voltage conversion circuit, wherein the input end of the voltage conversion circuit is electrically connected with the alternating voltage access end, the output end of the voltage conversion circuit is electrically connected with the input end of the main control circuit, and the voltage conversion circuit is used for converting the alternating voltage into the voltage and then outputting the power supply voltage.
The utility model also provides an automobile alternating-current charging pile which comprises the power supply switching circuit or the power supply circuit and the power supply circuit
And the communication circuit is electrically connected with the main control circuit and is used for outputting communication signals.
The utility model adopts a power supply switching circuit, wherein the power supply switching circuit is applied to an automobile alternating-current charging pile, and the automobile alternating-current charging pile comprises a main control circuit; the power supply switching circuit comprises a power supply circuit, a voltage stabilizing circuit and a filter circuit. Specifically, when commercial power of the automobile alternating-current charging pile is cut off, the power supply circuit provides a temporary power supply, outputs first voltage to the voltage stabilizing circuit, and outputs second voltage after being stabilized by the voltage stabilizing circuit. The second voltage is filtered by the filter circuit and then is output to the main control circuit, so that the main control circuit is electrified, and the communication circuit is further controlled, thereby realizing the technical effect of power failure notification. The power supply switching circuit enables the automobile alternating-current charging pile to have temporary power supply capability when the mains supply is disconnected, so that a user is informed of the fact that the current automobile charging is in a disconnected state in time.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of an embodiment of a power switching circuit according to the present utility model;
FIG. 2 is a schematic diagram of a power switching circuit according to an embodiment of the utility model;
fig. 3 is a schematic diagram of a power supply switching circuit according to an embodiment of the utility model.
Reference numerals illustrate:
| Reference numerals | Name of the name | Reference numerals | Name of the name |
| 10 | Main control circuit | C1-C6 | First capacitor-sixth capacitor |
| 20 | Power supply circuit | R1-R2 | First resistor-second resistor |
| 30 | Voltage stabilizing circuit | D1 | Light emitting diode |
| 40 | Filtering circuit | D2 | Voltage stabilizing diode |
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present utility model) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
In many existing automobile alternating-current charging piles, when commercial power is cut off, the automobile cannot be charged, and a user cannot be informed that the current charging pile is in a power-off state, and the automobile cannot acquire electric energy. When the user considers that the automobile is charged for a plurality of hours, the electric quantity of the automobile at the moment is found to be not expected when the automobile is enough to run. This will disturb the travel plan of the user and bring a very poor use experience to the user. Therefore, it is particularly important how to feed back the information to the user in time and stably when the mains supply is cut off.
Accordingly, referring to fig. 1 and 2, the present utility model proposes a power switching circuit applied to an automotive ac charging stake including a main control circuit 10, the power switching circuit including:
a power supply circuit 20, the power supply circuit 20 being configured to output a first voltage;
The input end of the voltage stabilizing circuit 30 is electrically connected with the output end of the power supply circuit 20, and the voltage stabilizing circuit 30 is used for stabilizing the input first voltage and outputting the first voltage;
The input end of the filter circuit 40 is electrically connected with the output end of the voltage stabilizing circuit 30, the output end of the filter circuit 40 is electrically connected with the power input end of the main control circuit 10, and the filter circuit 40 is used for filtering the second voltage after being output by the voltage stabilizing process and outputting the second voltage to the main control circuit 10.
The main control circuit 10 in the automobile ac charging stake may be implemented by an MCU (Microcontroller Unit, micro control unit), a DSP (DIGITAL SIGNAL Process, digital signal processing Chip), an FPGA (Field Programmable GATE ARRAY, programmable gate array Chip), an SOC (System On Chip), or the like.
In the present embodiment, the power supply circuit 20 may be implemented using a lithium battery, a nickel-hydrogen battery, or the like. The battery can be provided with a power input end which is connected with a mains supply connecting end of the automobile alternating-current charging pile, and the voltage is not externally output when the voltage is input to the mains supply connecting end, so that the internal electric quantity of the battery is always in a saturated state, and the battery is temporarily powered when the power supply of the following mains supply connecting end is disconnected. In addition, when the voltage input is provided at the mains supply access terminal, the battery is charged until the electric quantity of the battery is in a saturated state, so that the battery is ensured to have sufficient electric quantity to supply power for the subsequent work, and the first voltage is output. Specifically, the power supply circuit 20 comprises a power supply battery, and a capacitance circuit, wherein the input end of the capacitance circuit is electrically connected with the output end of the power supply battery, the output end of the capacitance circuit is electrically connected with the voltage stabilizing circuit 30, and the capacitance circuit is used for providing instantaneous high current. The capacitor circuit and the power supply battery jointly provide power for the circuit, and the advantages and the characteristics of the capacitor circuit and the power supply battery can be utilized to enable the capacitor circuit and the power supply battery to play different roles in the circuit. The power supply battery has an advantage in that it can provide a stable voltage, but has a disadvantage in that the discharge time is limited and the voltage gradually decreases as the battery is discharged. The capacitor circuit has the advantages of quick charge and discharge, high power density, long cycle life and the like, but has the disadvantage of relatively small capacity and cannot provide large current for a long time. In this case, the combination of the capacitive circuit and the power supply battery may provide a balanced power supply solution. The power supply battery can provide a stable power supply, while the super capacitor can provide a large current in a short time, for example, when a circuit or transient load is started. In this way, the circuit can respond quickly when needed, while maintaining a long-term stable operating condition.
Further, the capacitor circuit comprises a first capacitor C1 and a second capacitor C2;
The first end of the first capacitor C1 is electrically connected to the output end of the battery and the input end of the voltage stabilizing circuit 30, the second end of the first capacitor C1 is electrically connected to the second end of the second capacitor C2, and the second end of the second capacitor C2 is electrically connected to the output end of the battery, the input end of the voltage stabilizing circuit 30 and the ground end.
In the present embodiment, the voltage stabilizing circuit 30 may be implemented by a linear voltage stabilizing circuit 30, a zener diode voltage stabilizing circuit 30, a switching voltage stabilizing circuit 30, or the like. Specifically, the voltage stabilizing circuit 30 includes a third capacitor C3, a first inductor, and a voltage stabilizing chip, where a first end of the third capacitor C3 is electrically connected to the output end of the battery, a first end of the first capacitor C1, a first end of the first inductor, a BAT pin and an EN pin of the voltage stabilizing chip, a second end of the third capacitor is electrically connected to a second end of the second capacitor C2, an output end of the battery, and a ground end, and a second end of the first inductor is electrically connected to an SW pin of the voltage stabilizing chip. Furthermore, the voltage stabilizing chip can be realized by adopting a WPN4020H2R2MT linear voltage stabilizer. The WPN4020H2R2MT is a linear voltage regulator, and its main function is to convert an input voltage into a stable output voltage. In this circuit, it is used as a core component of the power supply module, responsible for regulating the input voltage to an output voltage of 5V, i.e. the second voltage. The operating principle of the linear voltage regulator is to regulate the output voltage by changing the conduction degree of the internal transistor. When the input voltage is higher than the set output voltage, the voltage stabilizer can reduce the conduction degree of the transistor so as to reduce the output voltage, otherwise, when the input voltage is lower than the set output voltage, the voltage stabilizer can increase the conduction degree of the transistor so as to improve the output voltage. This way of regulation ensures that the output voltage remains constant and is not affected by fluctuations in the input voltage. The WPN4020H2R2MT is characterized by low output noise, high efficiency and good linearity. It is often used in applications where a stable power supply is required, such as the powering of microcontrollers, sensors and other electronic devices. In this circuit, it is used to power the MCU, ensuring that the MCU is able to obtain a stable power supply, thus ensuring its normal operation. In addition, the third capacitor C3 and the first inductor form an LC oscillating circuit together for resonant filtering to assist the voltage stabilizing chip to work.
In the present embodiment, the filter circuit 40 may be implemented by a capacitor filter circuit 40, an inductor filter circuit 40, or the like. Specifically, the filter circuit 40 includes a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6, where a first end of the fourth capacitor C4 is electrically connected to the OUT pin of the voltage stabilizing chip, a first end of the fifth capacitor C5, a first end of the sixth capacitor C6, and the master circuit 10, and a second end of the fourth capacitor C4 is electrically connected to a second end of the fifth capacitor C5, a second end of the sixth capacitor C6, and a ground end. The second voltage output through the voltage stabilizing circuit 30 is filtered and then output to the main control circuit 10, so that the main control circuit 10 obtains a stable 5V voltage source.
When the commercial power of the automobile alternating-current charging pile is cut off, the power supply circuit 20 provides a temporary power supply, outputs a first voltage to the voltage stabilizing circuit 30, and outputs a second voltage after being subjected to voltage stabilizing treatment by the voltage stabilizing circuit 30. The second voltage is filtered by the filter circuit 40 and then output to the main control circuit 10, so that the main control circuit 10 is electrified and further controls the communication circuit, thereby realizing the technical effect of power failure notification. The power supply switching circuit enables the automobile alternating-current charging pile to have temporary power supply capability when the mains supply is disconnected, so that a user is informed of the fact that the current automobile charging is in a disconnected state in time.
Referring to fig. 2, in an embodiment of the present utility model, the power switching circuit further includes a clamping circuit, an input terminal of the clamping circuit is electrically connected to an output terminal of the filtering circuit 40, and the clamping circuit is configured to limit the output voltage below a preset threshold voltage.
In this embodiment, the clamp circuit may be implemented using a diode clamp circuit, an RC clamp circuit, or the like. Specifically, this can be achieved by the zener diode D2. The first voltage outputted from the power supply circuit 20 is stabilized by the voltage stabilizing circuit 30, and the second voltage outputted from the power supply circuit is filtered by the filtering circuit 40. The voltage output after the filtering processing is limited below the preset threshold voltage by the clamping circuit, so that the voltage output to the main control circuit 10 is within a safe value, and the power supply safety of the main control circuit 10 is further ensured.
Referring to fig. 2, in an embodiment of the present utility model, the power switching circuit further includes a prompting circuit, an input end of the prompting circuit is electrically connected to an output end of the voltage stabilizing circuit 30, and the prompting circuit is configured to output a prompting signal when the power switching circuit is in an operating state.
In this embodiment, the prompting circuit may be implemented by an indicator light prompting circuit, a voice prompting circuit, or the like, and specifically, may be implemented by an indicator light prompting circuit. The indicator lamp prompting circuit comprises a first resistor R1, a second resistor R2 and a light emitting diode D1, wherein the first end of the first resistor R1 is electrically connected with an ISET pin of the voltage stabilizing chip, the second end of the first resistor R1 is electrically connected with a cathode of the light emitting diode D1, a grounding end of the first resistor R2 and a PGND pin of the voltage stabilizing chip, the first end of the second resistor R2 is electrically connected with an LED pin of the voltage stabilizing chip, and the second end of the second resistor R2 is electrically connected with an anode of the light emitting diode D1. When the light emitting diode D1 is directly connected between the positive electrode of the power supply and the ground, the light emitting diode D1 works and emits light to prompt when the power supply is turned on. The light emitting diode D1 is connected to the power supply through a resistor, and the light emitting diode D1 emits light only when the current is sufficiently large. This typically means that the circuit has been properly turned on and the power supply has been turned on. Referring to the drawings, the light emitting diode D1 is generally used to indicate an operation state of the power circuit 20, for example, whether the power circuit 20 is turned on to operate. If the light emitting diode D1 is not on, it may indicate that the power supply circuit 20 is not on or that there is a circuit problem.
The utility model also proposes a power supply circuit comprising a power switching circuit as described in any one of the above. It should be noted that, because the power supply circuit of the present utility model is based on the above-mentioned power supply switching circuit, the embodiments of the power supply circuit of the present utility model include all the technical schemes of all the embodiments of the above-mentioned power supply switching circuit, and the achieved technical effects are identical, and are not repeated herein.
Referring to fig. 3, in an embodiment of the present utility model, the power supply circuit further includes a voltage conversion circuit, an input end of the voltage conversion circuit is electrically connected to the ac voltage access end, an output end of the voltage conversion circuit is electrically connected to the input end of the main control circuit 10, and the voltage conversion circuit is configured to output a power supply voltage after performing voltage conversion on the ac voltage.
In this embodiment, the voltage conversion circuit may be implemented by using a rectifying circuit and a DC/DC voltage conversion circuit, i.e., an AC/DC voltage converter, according to practical application scenarios. The relation between the supply voltage and the voltage required by the load is taken into account, so that the corresponding voltage conversion circuit is selected. Specifically, in the present embodiment, the power source connected to the ac charging pile is the commercial power source, the power source is ac power, and the power source required for the circuits of the main control circuit 10 is dc power. Therefore, the voltage conversion circuit employed in the present embodiment is an AC/DC voltage conversion circuit, and the AC/DC conversion circuit converts the input AC power into DC power and outputs the DC power to the power consumption unit.
In addition, in order to ensure the safety of the voltage conversion circuit when the alternating current is in voltage connection, a protection circuit can be additionally arranged at the input end of the voltage conversion circuit so as to improve the safety of the circuit. The protection circuit can be realized by adopting a current limiting circuit, a fuse and the like. Specifically, taking a fuse as an example, when a circuit malfunctions or is abnormal, the current is increased continuously, and the increased current may damage some important devices in the circuit, and may burn out the circuit or even cause a fire. If the fuse is correctly arranged in the circuit, the fuse can be automatically fused to cut off the current when the current is abnormally increased to a certain height and heat, so that the function of protecting the safe operation of the circuit is achieved. The input alternating current is limited below the first current, namely the safety current, by arranging the protection circuit, so that the safety of the power supply circuit is improved.
The power supply circuit further comprises a temperature detection circuit, which may be implemented using a detection circuit based on a heat sensitive device, such as a resistive voltage divider circuit based on an NTC resistor or an NTC probe, a resistive voltage divider circuit based on a PTC resistor or a PTC probe. Alternatively, the temperature detection circuit may also be implemented using a temperature sensor, such as an infrared temperature sensor, a thermocouple temperature sensor, or the like. The temperature detection circuits may be multiple, and the multiple temperature detection circuits may be separately disposed at different positions in the hanging device, and the main control circuit 10 may determine multiple temperature values according to the multiple temperature detection signals, and calculate the actual environmental temperature through a preset temperature algorithm, such as an average value, a weighted calculation, etc., so as to improve the accuracy of detecting the environmental temperature where the hanging device is located. Specifically, the temperature detection circuit adopts two groups of NTC resistors, and two ends of the NTC resistors are respectively connected to the positive electrode of the alternating current input end and the negative electrode of the alternating current output end, so that whether the current circuit is in an abnormal state or not is judged through temperature detection. Further, the power supply circuit further includes a voltage stabilizing circuit 30, a filtering circuit 40, and the like.
The utility model also provides an automobile alternating-current charging pile which comprises the power supply switching circuit or the power supply circuit as set forth in any one of the above, and
And a communication circuit electrically connected to the main control circuit 10, the communication circuit being configured to output a communication signal.
It is noted that, because the automotive ac charging pile of the present utility model is based on the above-mentioned power supply switching circuit or power supply circuit, the embodiments of the automotive ac charging pile of the present utility model include all the technical solutions of all the embodiments of the above-mentioned power supply switching circuit or power supply circuit, and the achieved technical effects are also completely the same, and are not described herein again.
In this embodiment, the communication circuit may be implemented using a wireless communication module, a wired communication module, or the like. The wireless communication module may employ a wireless communication chip, such as a 4G/5G communication chip, a WI F I communication chip, a bluetooth communication chip, a lan communication chip, or the like. The wired communication module 10 may employ a wired communication chip such as a CAN communication chip, an SPI communication chip, an I2C communication chip, a LIN communication chip, or the like. Specifically, a wireless communication module is taken as an example. When the commercial power of the automobile alternating-current charging pile stops supplying power, the power supply switching circuit supplies power to the main control circuit 10 and the like through the battery and the capacitor as temporary power supply sources. The main control circuit 10 can know that the current power supply is mains supply or battery and capacitor power supply through the voltage detection circuit. When the main control circuit 10 knows that the current power supply supplies power to the battery and the capacitor in the power supply switching circuit, the current automobile alternating-current charging pile is sent to the user through the communication circuit to be in a power-off state, so that the user can plan for use in advance, and the charging experience of the user is improved.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.
Claims (8)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420443789.7U CN222262236U (en) | 2024-03-05 | 2024-03-05 | Power supply switching circuit, power supply circuit and automobile alternating-current charging pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420443789.7U CN222262236U (en) | 2024-03-05 | 2024-03-05 | Power supply switching circuit, power supply circuit and automobile alternating-current charging pile |
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| Publication Number | Publication Date |
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| CN222262236U true CN222262236U (en) | 2024-12-27 |
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| CN202420443789.7U Active CN222262236U (en) | 2024-03-05 | 2024-03-05 | Power supply switching circuit, power supply circuit and automobile alternating-current charging pile |
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| CN (1) | CN222262236U (en) |
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