CN218897084U

CN218897084U - Automatic discernment commercial power circuit

Info

Publication number: CN218897084U
Application number: CN202223059071.8U
Authority: CN
Inventors: 陈决源; 林凌锋
Original assignee: Aiyuan Xiamen Electronic Co ltd
Current assignee: Aiyuan Xiamen Electronic Co ltd
Priority date: 2022-11-17
Filing date: 2022-11-17
Publication date: 2023-04-21
Anticipated expiration: 2032-11-17

Abstract

The utility model relates to an identification circuit field particularly, relates to an automatic discernment commercial power circuit, including current-voltage detection module, MCU control module, relay module and switching power supply module, current-voltage detection module and switching power supply module and commercial power electric connection, current-voltage detection module's signal output part and MCU control module's signal input part electric connection, MCU control module's signal output part and relay module's input electric connection, relay module's control end is connected on the commercial power, can write in the voltage parameter of each country at MCU control module, and after the commercial power plug inserted the commercial power, current-voltage detection module detects the current-voltage information and amplifies output and compares to MCU control module, judges whether the commercial power voltage accords with the write-in voltage, through the power supply and the outage of relay control external load.

Description

Automatic discernment commercial power circuit

Technical Field

The patent relates to the field of identification circuits, in particular to an automatic identification commercial power circuit.

Background

The standard voltages of different countries have certain difference, products in different countries can normally operate under specific standard voltages, if the products operate under wrong standard voltages, the products are easy to burn out of motors and other electronic components on the products, irreversible damage is caused, the importance of a commercial power identification circuit is highlighted, the circuit structure of the conventional commercial power identification circuit is complex, and the conventional commercial power identification circuit can only be used in specific countries and cannot meet the use requirements of the countries.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides an automatic identification commercial power circuit, which can solve the technical problems that the circuit structure of the existing circuit is complex, and the use of each country cannot be satisfied.

In order to solve the technical problems, the utility model provides the following technical scheme:

the utility model provides an automatic discernment commercial power circuit, its characterized in that includes current-voltage detection module, MCU control module, relay module and switching power supply module, current-voltage detection module and switching power supply module and commercial power electric connection, current-voltage detection module's signal output part and MCU control module's signal input part electric connection, MCU control module's signal output part and relay module's input electric connection, relay module's control end is connected on the commercial power, switching power supply module supplies power for MCU control module, relay module and current-voltage detection module.

Further, the current and voltage detection module comprises a pin P1 and a pin P2 which are connected with each other, and a mutual inductor U4, a mutual inductor U5, an operational amplifier U2, an operational amplifier U3, a resistor R1-resistor R7, a capacitor C3 and a capacitor C4; the pin 1 of the interface P1 and the pin 3 of the interface P2 are respectively connected with a live wire and a zero line, the pin 4 and the pin 6 of the interface P1 are connected and pass through a coil of the transformer U4, the pin 1 of the transformer U4 is electrically connected with the pin 3, the pin 4 of the transformer U4 is electrically connected with a reverse input end of the operational amplifier U2, the resistor R1 and the capacitor C3 are connected in parallel between the reverse input end and the output end of the operational amplifier U2, the output end of the operational amplifier U2 is electrically connected with one end of the resistor R2, and the other end of the resistor R2 is electrically connected with one end of the resistor R3 and a signal input end of the MCU control module;

the pin 4 of interface P2 and the pin 2 electric connection of mutual-inductor U5, resistance R7 connects between the pin 1 of mutual-inductor U5 and the pin 6 of interface P2, the pin 3 of mutual-inductor U5 and pin 4 are connected respectively on operational amplifier U3's normal phase input and inverting input, resistance R4 and electric capacity C4 connect in parallel between operational amplifier U3's inverting input and output, operational amplifier U3's output and resistance R5's one end electric connection, resistance R5's the other end and resistance R6's one end and MCU control module's signal input electric connection, the other end of mutual-inductor U4's pin 2, operational amplifier U2's normal phase input and resistance R3, resistance R6's the equal ground connection.

Further, the MCU control module comprises a control chip U1, a pin 6 of the control chip U1 is electrically connected with a signal input end of the relay module, a pin 7 and a pin 8 of the control chip U1 are electrically connected with a signal output end of the power supply voltage detection module, a pin 9 of the control chip U1 is electrically connected with a power supply output end of the switch power supply module, and a pin 1 and a pin 28 of the control chip U1 are electrically connected with an external load.

Further, the relay module comprises a relay U6, a triode Q2, a mos tube Q3, a diode D3, resistors R40-R43 and a capacitor C10, one ends of the resistor R41 and the resistor R42 are electrically connected with a base electrode of the triode Q2, the other end of the resistor R41 is electrically connected with a signal output end of the MCU control module, the resistor R43 is connected between a collector electrode of the triode Q2 and a grid electrode of the mos tube Q3, a power output end of the switch power module is electrically connected with one end of the resistor R40 and a drain electrode of the mos tube Q3, the other end of the resistor R40 is electrically connected with the grid electrode of the mos tube Q3, a source electrode of the mos tube is electrically connected with a pin 2 of the relay U6, a negative electrode of the diode D3 and one end of the capacitor C10, a pin 3 and a pin 4 of the relay U6 are respectively connected with a zero line and a fire wire, and the positive electrode of the pin 1 of the relay U6, the diode D3 and the other end of the resistor R42 are grounded.

Further, the power input end of the switch power supply module is electrically connected with the live wire and the zero wire respectively, the first power output end of the switch power supply module is electrically connected with the power input end of the MCU control module, the first power output end of the switch power supply module is further electrically connected with a capacitor C1 and a capacitor C2, the second power output end of the switch power supply module is electrically connected with the current and voltage detection module and the power input end of the relay module, and the grounding end of the switch power supply module is grounded with the capacitor C1 and the capacitor C2.

Further, a signal output end of the MCU control module is connected with a display module.

Further, the display module includes a display screen U8, and the pins 17-27 of the control chip U1 are electrically connected with the pins 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 and 0 of the display screen U8 respectively.

Further, the model of the control chip U1 is BS66F340.

The beneficial effects of the utility model are as follows:

in this scheme, can write in the voltage parameter of each country at MCU control module, after the commercial power plug inserts the commercial power, current-voltage detection module detects the current-voltage information and amplifies output and carry out the comparison to MCU control module, judges whether the commercial power voltage is in conformity with the write-in voltage, controls the power supply and the outage of external load through the relay, can effectively protect external load, can use in the voltage range of different countries.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a circuit flow for automatically identifying a mains supply according to the present utility model;

fig. 2 is a circuit diagram of an automatic identification mains supply according to the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

Referring to fig. 1 and 2, the present utility model provides an automatic mains supply identification circuit, which includes a current and voltage detection module, an MCU control module, a relay module, a display module and a switching power supply module, wherein the current and voltage detection module and the switching power supply module are electrically connected with the mains supply. The signal output end of the current and voltage detection module is electrically connected with the signal input end of the MCU control module, and the current and voltage detection module detects the voltage of the mains supply and transmits the voltage of the mains supply to the MCU control module. The signal output end of the MCU control module is electrically connected with the input ends of the relay module and the display module, the MCU control module compares the mains voltage with the set voltage, and the work of the relay module is controlled according to the comparison result. The control end of the relay module is connected to the mains supply, the relay module controls the on-off of the mains supply, the mains supply is connected with an external load, and the external load is connected to the rear end of the relay module, so that the external load is protected. The switching power supply module supplies power for the MCU control module, the relay module and the current and voltage detection module.

Referring to fig. 2, the power input end of the switching power module is electrically connected to the live wire and the neutral wire respectively, and in this embodiment, the first power output end of the switching power module outputs +5v voltage, and the second power output end of the switching power module outputs +15v voltage. The first power output end of the switch power supply module is electrically connected with the power input end of the MCU control module, the first power output end of the switch power supply module is also electrically connected with a capacitor C1 and a capacitor C2, the second power output end of the switch power supply module is electrically connected with the current and voltage detection module and the power input end of the relay module, and the grounding end of the switch power supply module is grounded with the capacitor C1 and the capacitor C2.

Referring to fig. 2, the mcu control module includes a control chip U1, and a pin 6 of the control chip U1 is electrically connected to a signal input end of the relay module; the pin 7 and the pin 8 of the control chip U1 are electrically connected with the signal output end of the power supply voltage detection module; the pin 9 of the control chip U1 is electrically connected with the power output end of the switching power supply module, in this embodiment, the pin 9 of the control chip U1 is electrically connected with the first power output end of the switching power supply module, namely, the pin 4; pin 1 and pin 28 of control chip U1 are electrically connected with external load; the pins 17-27 of the control chip U1 are electrically connected with the signal input end of the display module. In this embodiment, the model of the control chip U1 is BS66F340. The control chip U1 compares the written voltage value with the voltage value detected by the current voltage detection module, so as to control whether the relay works or not and control connection and disconnection of the mains supply.

Referring to fig. 2, the current-voltage detection module includes a pin P1 and a pin P2 connected with each other, and a transformer U4, a transformer U5, an operational amplifier U2, an operational amplifier U3, a resistor R1-resistor R7, a capacitor C3, and a capacitor C4. Pin 1 of interface P1 and pin 3 of interface P2 are connected with the live and neutral wires, respectively, and pin 4 and pin 6 of interface P1 are connected and pass through the coil of transformer U4. Pin 1 of the transformer U4 is electrically connected with pin 3, and pin 4 of the transformer U4 is electrically connected with the inverting input end of the operational amplifier U2. The resistor R1 and the capacitor C3 are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U2, and the power output terminal of the switching power supply module is connected to the pin 5 of the operational amplifier U2, in this embodiment, the second power output terminal of the switching power supply module, that is, the pin 5 is electrically connected to the pin 5 of the operational amplifier U2. The output end of the operational amplifier U2 is electrically connected with one end of the resistor R2, the other end of the resistor R2 is electrically connected with one end of the resistor R3 and the signal input end of the MCU control module, in this embodiment, the other end of the resistor R2 is electrically connected with the pin 7 of the control chip U1.

Pin 4 of interface P2 is electrically connected with pin 2 of transformer U5, and resistor R7 is connected between pin 1 of transformer U5 and pin 6 of interface P2. Pin 3 and pin 4 of the transformer U5 are connected to the non-inverting input and inverting input of the operational amplifier U3, respectively. Resistor R4 and capacitor C4 are connected in parallel between the inverting input and output of op amp U3. The output end of the operational amplifier U3 is electrically connected with one end of the resistor R5, the other end of the resistor R5 is electrically connected with one end of the resistor R6 and the signal input end of the MCU control module, and in this embodiment, the other end of the resistor R5 is electrically connected with the pin 8 of the control chip U1. The pin 2 of the transformer U4, the non-inverting input end of the operational amplifier U2, the resistor R3 and the other end of the resistor R6 are all grounded. In this embodiment, the model of the transformer U4 and the transformer U5 is ZEMCT131, the model of the operational amplifier U2 and the operational amplifier U3 is LM321, and the live wire passes through the transformer U4, so that the transformer generates an induced current, the pins P1 and P2 connected with each other can effectively increase the inductance of the transformer, the better detection current is achieved, and the voltage information and the current information are amplified and output to the MCU control module by controlling the resistance values of the resistor R1 and the resistor R4.

Referring to fig. 2, the relay module includes a relay U6, a transistor Q2, a mos transistor Q3, a diode D3, resistors R40-R43, and a capacitor C10. One end of the resistor R41 and one end of the resistor R42 are electrically connected with the base electrode of the triode Q2, the other end of the resistor R41 is electrically connected with the signal output end of the MCU control module, and in the embodiment, the other end of the resistor R41 is electrically connected with the pin 6 of the control chip U1. Resistor R43 is connected between the collector of transistor Q2 and the gate of mos transistor Q3. In this embodiment, the second power output end of the switching power module, i.e. the pin 5, is electrically connected to one end of the resistor R40 and the drain of the mos transistor Q3. The other end of the resistor R40 is electrically connected with the grid electrode of the mos tube Q3, the source electrode of the mos tube is electrically connected with the pin 2 of the relay U6, the cathode of the diode D3 and one end of the capacitor C10, the pin 3 and the pin 4 of the relay U6 are respectively connected with a zero line and a live line, and the pin 1 of the relay U6, the anode of the diode D3, the capacitor C10 and the other end of the resistor R42 are grounded. In this embodiment, the relay U6 is a bidirectional relay.

Referring to fig. 2, the display module includes a display screen U8, and pins 17-27 of the control chip U1 are electrically connected to pins 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 and 0 of the display screen U8, respectively. The display module displays the contents such as voltage information, external load work information and the like.

When the power supply device is used, voltage parameters of various countries can be written into the MCU control module, after the mains supply plug is plugged into the mains supply, the current voltage detection module detects, amplifies and outputs current voltage information to the MCU control module for comparison, whether the mains supply voltage accords with the written voltage is judged, and the relay is used for controlling the power supply and the power failure of an external load, so that the external load can be effectively protected, and the power supply device can be used in the voltage range of different countries. Meanwhile, overvoltage and overcurrent protection functions are realized through the transformer, high voltage of a power grid or high voltage generated by lightning stroke is rapidly detected and subjected to power failure treatment, and the protection effect is good.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present utility model, and are not intended to limit the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an automatic discernment commercial power circuit, its characterized in that includes current-voltage detection module, MCU control module, relay module and switching power supply module, current-voltage detection module and switching power supply module and commercial power electric connection, current-voltage detection module's signal output part and MCU control module's signal input part electric connection, MCU control module's signal output part and relay module's input electric connection, relay module's control end is connected on the commercial power, switching power supply module supplies power for MCU control module, relay module and current-voltage detection module.

2. The automatic identification mains circuit of claim 1, wherein: the current and voltage detection module comprises a pin P1 and a pin P2 which are connected with each other, and a mutual inductor U4, a mutual inductor U5, an operational amplifier U2, an operational amplifier U3, a resistor R1-resistor R7, a capacitor C3 and a capacitor C4; the pin 1 of the interface P1 and the pin 3 of the interface P2 are respectively connected with a live wire and a zero line, the pin 4 and the pin 6 of the interface P1 are connected and pass through a coil of the transformer U4, the pin 1 of the transformer U4 is electrically connected with the pin 3, the pin 4 of the transformer U4 is electrically connected with a reverse input end of the operational amplifier U2, the resistor R1 and the capacitor C3 are connected in parallel between the reverse input end and the output end of the operational amplifier U2, the output end of the operational amplifier U2 is electrically connected with one end of the resistor R2, and the other end of the resistor R2 is electrically connected with one end of the resistor R3 and a signal input end of the MCU control module;

3. The automatic identification mains circuit of claim 1, wherein: the MCU control module comprises a control chip U1, a pin 6 of the control chip U1 is electrically connected with a signal input end of the relay module, a pin 7 and a pin 8 of the control chip U1 are electrically connected with a signal output end of the power supply voltage detection module, a pin 9 of the control chip U1 is electrically connected with a power supply output end of the switch power supply module, and a pin 1 and a pin 28 of the control chip U1 are electrically connected with an external load.

4. The automatic identification mains circuit of claim 1, wherein: the relay module comprises a relay U6, a triode Q2, a mos tube Q3, a diode D3, resistors R40-R43 and a capacitor C10, wherein one ends of the resistor R41 and the resistor R42 are electrically connected with a base electrode of the triode Q2, the other end of the resistor R41 is electrically connected with a signal output end of the MCU control module, the resistor R43 is connected between a collector electrode of the triode Q2 and a grid electrode of the mos tube Q3, a power output end of the switch power supply module is electrically connected with one end of the resistor R40 and a drain electrode of the mos tube Q3, the other end of the resistor R40 is electrically connected with the grid electrode of the mos tube Q3, a source electrode of the mos tube is electrically connected with a pin 2 of the relay U6, a negative electrode of the diode D3 and one end of the capacitor C10, a pin 3 and a pin 4 of the relay U6 are respectively connected with a zero line and a fire wire, and the positive electrode of the pin 1 of the relay U6, the diode D3 and the other end of the resistor R42 are grounded.

5. The automatic identification mains circuit of claim 1, wherein: the power input end of the switch power supply module is electrically connected with the live wire and the zero wire respectively, the first power output end of the switch power supply module is electrically connected with the power input end of the MCU control module, the first power output end of the switch power supply module is electrically connected with the capacitor C1 and the capacitor C2, the second power output end of the switch power supply module is electrically connected with the current and voltage detection module and the power input end of the relay module, and the grounding end of the switch power supply module is grounded with the capacitor C1 and the capacitor C2.

6. The automatic identification mains circuit of claim 3, wherein: and a signal output end of the MCU control module is connected with a display module.

7. The automatic identification mains circuit of claim 3, wherein: the display module comprises a display screen U8, and a pin 17-pin 27 of the control chip U1 is electrically connected with a pin 10, a pin 9, a pin 8, a pin 7, a pin 6, a pin 5, a pin 4, a pin 3, a pin 2, a pin 1 and a pin 0 of the display screen U8 respectively.

8. The automatic identification mains circuit of claim 3, wherein: the model of the control chip U1 is BS66F340.