CN207910442U

CN207910442U - Microcontroller power supply circuit

Info

Publication number: CN207910442U
Application number: CN201820399001.1U
Authority: CN
Inventors: 向立
Original assignee: Chengdu Euro Du System Technology Co Ltd
Current assignee: Chengdu Euro Du System Technology Co Ltd
Priority date: 2018-03-22
Filing date: 2018-03-22
Publication date: 2018-09-25
Anticipated expiration: 2028-03-22

Abstract

The utility model discloses a kind of microcontroller power supply circuits, including first resistor, second resistance, 3rd resistor and the 4th resistance；First capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance, the 6th capacitance, the 7th capacitance and the 8th capacitance；First diode, the second diode, rectifier bridge, voltage-stabiliser tube, thyristor, transistor, three terminal regulator, fuse and transformer；The utility model microcontroller power supply circuit realizes overvoltage protection by voltage-stabiliser tube, 3rd resistor, thyristor and fuse; parallel expansion stream is realized by external transistor; and protected by diode pair three terminal regulator and transistor, it is whole to realize overvoltage protection, the function of high-frequency harmonic AF panel.

Description

Microcontroller power supply circuit

Technical field

The utility model is related to power circuit more particularly to a kind of microcontroller power supply circuits.

Background technology

Microcontroller is a kind of IC chip, is to use very large scale integration technology with data-handling capacity Central processor CPU, random access memory ram, read only memory ROM, it is a variety of I/O mouthfuls and interrupt system, timer/counter Etc. functions (may further include the circuits such as display driver circuit, pulse-width modulation circuit, analog multiplexer, A/D converter) collection At to the small and perfect microcomputer system constituted on one piece of silicon chip, in industrial control field extensive use.Generally The supply voltage that uses of microcontroller for 5V, it is therefore desirable to rectification is carried out to alternating current by power circuit, complies with monolithic The work requirements of machine.The expansion stream of traditional microcontroller power supply circuit, overcurrent protection function are weaker, can not be according to service condition pair The output current of power circuit is adjusted, and makes microcontroller that can not effectively work.

Utility model content

The purpose of this utility model is that solve the above-mentioned problems and provides a kind of microcontroller power supply circuit.

The utility model is achieved through the following technical solutions above-mentioned purpose：

A kind of microcontroller power supply circuit, including,

First resistor, second resistance, 3rd resistor and the 4th resistance；

First capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance, the 6th capacitance, the 7th capacitance and the 8th Capacitance；

First diode, the second diode, rectifier bridge, voltage-stabiliser tube, thyristor, transistor, three terminal regulator, fuse and Transformer；

Two input terminals of the transformer are electrically connected with the zero curve of alternating current and firewire respectively, the rectifier bridge and described First capacitance is arranged in parallel and is electrically connected respectively with two output ends of the transformer, and the fuse is connected on described first Between the first end of capacitance and the electrode input end of the rectifier bridge, the first end of second capacitance, the thyristor are just Pole, the first end of the 4th capacitance, the first end of the first resistor, the first end of the second resistance, the described 1st The emitter of the cathode of pole pipe and the transistor is electrically connected with the cathode output end of the rectifier bridge, the second resistance Second end respectively with the first end of the 5th capacitance, the first end of the 6th capacitance, the first end of the three terminal regulator, The base stage electrical connection of the cathode and the transistor of second diode, the collector of the transistor and the one or two pole The second end of positive, the described three terminal regulator of positive, described second diode of pipe, the first end of the 7th capacitance, institute It states the first end electrical connection of the first end of the 8th capacitance, the cathode of the voltage-stabiliser tube and the 4th resistance and is power supply electricity The cathode output end on road, first end, the control pole of the thyristor and the institute of the anode and the 3rd resistor of the voltage-stabiliser tube State the first end electrical connection of third capacitance, the second end of second capacitance, the second end of the third capacitance, the thyristor Cathode, the second end of the 4th capacitance, the second end of the first resistor, the second end of the 5th capacitance, described The second end of six capacitances, the third end of the three terminal regulator, the second end of the 7th capacitance, the 8th capacitance second The second end at end, the second end of the 3rd resistor and the 4th resistance is electrically connected with the cathode output end of the rectifier bridge And it is the cathode output end of the power circuit.

Specifically, the first resistor, the second resistance, the 3rd resistor and the 4th resistance be 0.25~ The resistance value of 0.5W RJ resistance, the first resistor is 10K Ω, and the resistance value of the second resistance is 470 Ω, the 3rd resistor Resistance value be 4.7K Ω, the resistance value of the 4th resistance is 1K Ω；

The capacitance of first capacitance is 0.4 μ F, and the capacitance of second capacitance is 0.4 μ F, the appearance of the third capacitance Value is 1 μ F, and the capacitance of the 4th capacitance is 6800 μ F, and the capacitance of the 5th capacitance is 0.022 μ F, the 6th capacitance Capacitance is 0.022 μ F, and the capacitance of the 7th capacitance is 0.022 μ F, and the capacitance of the 8th capacitance is 220 μ F；

The model 1S1885 of first diode and second diode, the model of the thyristor SF8841, the model 25B683 of the transistor, the model H7805 of the three terminal regulator, the model of the rectifier bridge Blowout current for 4G4B41, the model 2CW103 of the voltage-stabiliser tube, the fuse is 3.15A.

The beneficial effects of the utility model are：

The utility model microcontroller power supply circuit realizes that overvoltage is protected by voltage-stabiliser tube, 3rd resistor, thyristor and fuse Shield is realized that parallel expansion is flowed by external transistor, and is protected by diode pair three terminal regulator and transistor, whole Realize overvoltage protection, the function of high-frequency harmonic AF panel.

Description of the drawings

Fig. 1 is the circuit diagram of microcontroller power supply circuit described in the utility model.

Specific implementation mode

The utility model is described in further detail below in conjunction with the accompanying drawings：

This technology, which essentially consists in, protects the circuit structure, and the concrete model to each electronic component and resistance, capacitance Deng parameter carried out detailed regulation, those skilled in the art can pass through circuit shown in FIG. 1 in its knowledge Figure is attached each electronic component, to realize that this technology needs purpose to be achieved, that is, solves that stream can not be expanded and voltage is protected The weaker problem of protective function；And should be circuit structure, as long as each electronic component is connected to become one completely by conducting wire Its function can be thus achieved in circuit, therefore no longer needs additional specific product structure.

As shown in Figure 1, a kind of microcontroller power supply circuit of the utility model, including,

First resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4；

First capacitance C1, the second capacitance C2, third capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the 6th capacitance C6, Seven capacitance C7 and the 8th capacitance C8；

First diode VD1, the second diode VD2, rectifier bridge FR, voltage-stabiliser tube VZ, thyristor VS, transistor VT, three ends Voltage-stablizer IC, fuse FU and transformer T；

Two input terminals of transformer T are electrically connected with the zero curve of alternating current and firewire respectively, rectifier bridge FR and the first capacitance C1 is arranged in parallel and is electrically connected respectively with two output ends of transformer T, and fuse FU is connected on the first end of the first capacitance C1 Between the electrode input end of rectifier bridge FR, the first end of the second capacitance C2, the anode of thyristor VS, the 4th capacitance C4 first End, the first end of first resistor R1, the first end of second resistance R2, the first diode VD1 cathode and transistor VT transmitting Extremely be electrically connected with the cathode output end of rectifier bridge FR, the second end of second resistance R2 respectively with the first end of the 5th capacitance C5, The base stage electricity of the first end of 6th capacitance C6, the first end of three terminal regulator IC, the cathode of the second diode VD2 and transistor VT Connection, the collector of transistor VT and the anode of the first diode VD1, the anode of the second diode VD2, three terminal regulator IC The first of second end, the first end of the 7th capacitance C7, the first end of the 8th capacitance C8, the cathode of voltage-stabiliser tube VZ and the 4th resistance R4 End electrical connection and the cathode output end for power circuit, the anode of voltage-stabiliser tube VZ and first end, the thyristor VS of 3rd resistor R3 Control pole and third capacitance C3 first end electrical connection, the second end of the second capacitance C2, the second end of third capacitance C3, brilliant lock The cathode of pipe VS, the second end of the 4th capacitance C4, the second end of first resistor R1, the second end of the 5th capacitance C5, the 6th capacitance The second end of C6, the third end of three terminal regulator IC, the second end of the 7th capacitance C7, the second end of the 8th capacitance C8, third electricity The second end of the second end and the 4th resistance R4 that hinder R3 is electrically connected with the cathode output end of rectifier bridge FR and is power circuit Cathode output end.

First resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4 be 0.25~0.5W RJ resistance, first The resistance value of resistance R1 is 10K Ω, and the resistance value of second resistance R2 is 470 Ω, and the resistance value of 3rd resistor R3 is 4.7K Ω, the 4th resistance The resistance value of R4 is 1K Ω；

The capacitance that the capacitance of first capacitance C1 is 0.4 μ F, the second capacitance C2 is 0.4 μ F, and the capacitance of third capacitance C3 is 1 μ The capacitance of F, the 4th capacitance C4 are 6800 μ F, and the capacitance of the 5th capacitance C5 is 0.022 μ F, and the capacitance of the 6th capacitance C6 is 0.022 μ The capacitance of F, the 7th capacitance C7 are 0.022 μ F, and the capacitance of the 8th capacitance C8 is 220 μ F；

The model SF8841 of the model 1S1885 of first diode VD1 and the second diode VD2, thyristor VS, it is brilliant The model 4G4B41 of the model H7805 of the model 25B683 of body pipe VT, three terminal regulator IC, rectifier bridge FR, voltage-stabiliser tube The blowout current of the model 2CW103 of VZ, fuse FU are 3.15A.

The operation principle of the utility model microcontroller power supply circuit is as follows：

It is steady that alternating current 220V makes output end obtain after transformer T decompressions, by rectifier bridge FR and subsequent conditioning circuit rectification, filtering Fixed 5V voltages.

The maximum output current of three terminal regulator IC is 1.5A will then expand output to make output current be more than 1.5A Electric current meets a powerful transistor VT in the periphery of three terminal regulator IC thus.Using and connect formula expand stream mode, i.e., The first end of three terminal regulator IC is connected with the base stage of transistor VT, and second end is connected with the collector of transistor VT, and such two The sum of output current can meet the requirement of output 1.6A electric currents.If necessary to the output current of bigger, 2~3 big work(can be used instead Rate pipe parallel connection.

Even if there is regulator circuit inside three terminal regulator IC, the regulated power supply of the compositions such as three terminal regulator IC and transistor VT Output end is it is possible to occur overvoltage phenomenon.To ensure the safety of load, the power supply is on integrated package typical application circuit basis On, add excess voltage protection.The circuit is made of voltage-stabiliser tube VZ, 3rd resistor R3, thyristor VS and fuse FU etc..

Output voltage is 5V when the power work is normal, and thyristor VS is in cut-off state.When regulated power supply is due to certain original When so that output voltage is more than limit value because of (such as integrated package damage or the breakdown of adjustment pipe), that is, it is more than or equal to 5.6V, voltage-stabiliser tube VZ is hit It wears, sampled voltage raising makes thyristor VS trigger and be connected, and causes fuse failure, to protect load.

When input terminal occurs short circuit or output end overvoltage and thyristor VS conductings is made to cause input terminal shortcircuit, three-terminal voltage-stabilizing Device IC input terminal voltages are because fuse failure is zero at once, and charge sufficient on the 8th capacitance C8 of output end cannot be immediately then Zero, thus output end transient voltage is caused to be higher than input terminal, this reverse peak voltage punctures three terminal regulator IC in order to prevent Or transistor VT, in the emitter and inter-collector respectively in parallel the of the first end of three sections of voltage-stablizers, second end and transistor VT One diode VD1, the second diode VD2 are primarily used to three sections of voltage-stablizers of protection and transistor VT.

First capacitance C1 and the second capacitance C2 outputs and inputs capacitor for rectifier bridge FR's, and it is dry to can inhibit high-frequency harmonic It disturbs.First resistor R1 provides leakage current circuit for the 4th capacitance C4.

The technical solution of the utility model is not limited to the limitation of above-mentioned specific embodiment, every skill according to the present utility model The technology deformation that art scheme is made, each falls within the scope of protection of the utility model.

Claims

1. a kind of microcontroller power supply circuit, it is characterised in that：Including,

First resistor, second resistance, 3rd resistor and the 4th resistance；

First diode, the second diode, rectifier bridge, voltage-stabiliser tube, thyristor, transistor, three terminal regulator, fuse and transformation Device；

Two input terminals of the transformer are electrically connected with the zero curve of alternating current and firewire respectively, the rectifier bridge and described first Capacitance is arranged in parallel and is electrically connected respectively with two output ends of the transformer, and the fuse is connected on first capacitance First end and the electrode input end of the rectifier bridge between, the first end of second capacitance, the anode of the thyristor, institute State the first end of the 4th capacitance, the first end of the first resistor, the first end of the second resistance, first diode The emitter of cathode and the transistor is electrically connected with the cathode output end of the rectifier bridge, the second end of the second resistance Respectively with the first end of the 5th capacitance, the first end of the 6th capacitance, the first end of the three terminal regulator, described The base stage of the cathode of two diodes and the transistor is electrically connected, and the collector of the transistor and first diode are just Pole, the second end of positive, the described three terminal regulator of second diode, the first end of the 7th capacitance, the described 8th The first end of the first end of capacitance, the cathode of the voltage-stabiliser tube and the 4th resistance be electrically connected and for the power circuit just Pole output end, first end, the control pole of the thyristor and the third of the anode and the 3rd resistor of the voltage-stabiliser tube The first end of capacitance is electrically connected, the second end of second capacitance, the second end of the third capacitance, the thyristor it is negative Pole, the second end of the 4th capacitance, the second end of the first resistor, the second end of the 5th capacitance, the 6th electricity The second end of appearance, the third end of the three terminal regulator, the second end of the 7th capacitance, the second end of the 8th capacitance, The second end of the 3rd resistor and the second end of the 4th resistance be electrically connected with the cathode output end of the rectifier bridge and For the cathode output end of the power circuit.

2. microcontroller power supply circuit according to claim 1, it is characterised in that：The first resistor, the second resistance, The 3rd resistor and the 4th resistance are 0.25~0.5W RJ resistance, and the resistance value of the first resistor is 10K Ω, described The resistance value of second resistance is 470 Ω, and the resistance value of the 3rd resistor is 4.7K Ω, and the resistance value of the 4th resistance is 1K Ω；

The capacitance of first capacitance is 0.4 μ F, and the capacitance of second capacitance is 0.4 μ F, and the capacitance of the third capacitance is 1 The capacitance of μ F, the 4th capacitance are 6800 μ F, and the capacitance of the 5th capacitance is 0.022 μ F, the capacitance of the 6th capacitance Capacitance for 0.022 μ F, the 7th capacitance is 0.022 μ F, and the capacitance of the 8th capacitance is 220 μ F；

The model 1S1885 of first diode and second diode, the model SF8841 of the thyristor, institute The model 25B683 of transistor, the model H7805 of the three terminal regulator, the model 4G4B41 of the rectifier bridge are stated, The model 2CW103 of the voltage-stabiliser tube.