CN208737403U

CN208737403U - Computer with power supply protection function

Info

Publication number: CN208737403U
Application number: CN201821586259.9U
Authority: CN
Inventors: 钱伟光
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-09-27
Filing date: 2018-09-27
Publication date: 2019-04-12
Anticipated expiration: 2028-09-27

Abstract

The utility model discloses a kind of computers with power supply protection function; including shell; main circuit board is equipped in shell, main circuit board is equipped with the first current rectifying and wave filtering circuit, switching circuit, freewheeling circuit, pulse generating circuit, voltage regulator circuit, circuit for power conversion, the second current rectifying and wave filtering circuit, DC power supply circuit, protection circuit and single-chip microcontroller；Switching circuit includes the first triode, the first metal-oxide-semiconductor, the first DC power supply, the second DC power supply, third DC power supply, first resistor, second resistance, first capacitor, the second capacitor and first diode, the base stage of first triode is connect by first resistor with the first DC power supply, the emitter of first triode and the input terminal of freewheeling circuit connect, and the collector of the first triode is connect with one end of the cathode of first diode and the second capacitor respectively.The circuit structure of the utility model is relatively simple, cost is relatively low, the safety and reliability of circuit is higher.

Description

Computer with power supply protection function

Technical field

The utility model relates to computer field, in particular to a kind of computer with power supply protection function.

Background technique

Computer (computer) is commonly called as computer, is 20th century one of state-of-the-art scientific and technical utility model, to the mankind Production activity and social activities produce extremely important influence, and develop rapidly with strong vitality, its application neck Domain, to the every field of society, has formd huge computer industry from initial military research application extension, drives The technological progress of global range, has thus caused deep social change.Computer has spread general enterprises and institutions, school. Computer application is more and more common in China, and after reform and opening-up, the quantity of China Computer Users is constantly soaring, especially The application for interconnecting the fields such as logical communicating multimedia achieves good achievement.The circuit of the power pack of traditional computer-internal Structure is complex, and hardware cost is higher.In addition, the power pack of traditional computer-internal is protected due to lacking corresponding circuit Protective function causes the safety and reliability of circuit not high.

Utility model content

The technical problem to be solved by the present invention is in view of the above drawbacks of the prior art, provide a kind of circuit knot Structure is relatively simple, cost is relatively low, the higher computer with power supply protection function of the safety and reliability of circuit.

The technical scheme adopted by the utility model to solve the technical problem is as follows: constructing a kind of with power supply protection function Computer, including shell, the shell is interior to be equipped with main circuit board, and the main circuit board is equipped with the first current rectifying and wave filtering circuit, opens Powered-down road, freewheeling circuit, pulse generating circuit, voltage regulator circuit, circuit for power conversion, the second current rectifying and wave filtering circuit, DC power supply Circuit, protection circuit and single-chip microcontroller, the output end of first current rectifying and wave filtering circuit and an input terminal of the switching circuit Connection, the control terminal of the switching circuit are connect with the input terminal of the freewheeling circuit, an output end of the freewheeling circuit Connect with the input terminal of the pulse generating circuit, the output end of the pulse generating circuit and the switching circuit another Input terminal connection, the another output of the freewheeling circuit are connect with the input terminal of the voltage regulator circuit, the voltage regulator circuit Output end connect with an input terminal of the circuit for power conversion, the output end of the circuit for power conversion and described second The input terminal of current rectifying and wave filtering circuit connects, an output end and the DC power supply circuit of second current rectifying and wave filtering circuit Input terminal connection, the output end of the DC power supply circuit are connect with the input terminal of the protection circuit, the second rectification filter The another output of wave circuit is connect with the input terminal of the single-chip microcontroller, and the output end of the single-chip microcontroller and the power are converted Another input terminal of circuit connects；

The switching circuit is straight including the first triode, the first metal-oxide-semiconductor, the first DC power supply, the second DC power supply, third The base stage of galvanic electricity source, first resistor, second resistance, first capacitor, the second capacitor and first diode, first triode is logical It crosses the first resistor to connect with first DC power supply, the emitter of first triode is defeated with the freewheeling circuit Enter end connection, the collector of first triode connects with one end of the cathode of the first diode and the second capacitor respectively It connecing, the other end of second capacitor is connect with the grid of one end of the second resistance and the first metal-oxide-semiconductor respectively, and described first The source electrode of the anode of diode, the other end of second resistance and the first metal-oxide-semiconductor is connect with second DC power supply, and described The drain electrode of one metal-oxide-semiconductor is connect with one end of the third DC power supply and first capacitor respectively, the other end of the first capacitor Ground connection, the model S-183T of the first diode, the capacitance of second capacitor are 500pF, the second resistance Resistance value is 30k Ω.

In the computer described in the utility model with power supply protection function, first triode is NPN type three Pole pipe, first metal-oxide-semiconductor are P-channel metal-oxide-semiconductor.

In the computer described in the utility model with power supply protection function, the voltage regulator circuit includes third electricity Resistance, the 4th resistance, the 5th resistance, the 6th resistance, the second triode, third transistor, the 4th triode, the second metal-oxide-semiconductor, third Capacitor, the second zener diode and third diode, one end of the 3rd resistor respectively with the freewheeling circuit another Output end connection, the other end of the 3rd resistor connect with the base stage of one end of the 4th resistance and the 4th triode respectively Connect, the other end of the 4th resistance is connect with the collector of second triode, the emitter of second triode and The emitter of third transistor is grounded, the emitter of the 4th triode respectively with one end of the 3rd resistor, the 5th One end of resistance is connected with the source electrode of the second metal-oxide-semiconductor, and the collector of the 4th triode is another with the 5th resistance respectively One end, the second metal-oxide-semiconductor grid connected with one end of third capacitor, the other end of the third capacitor and the third transistor Collector connection, the base stage of the third transistor is used as to generator terminal；

The base stage of second triode is connect with the cathode of the third diode, the anode point of the third diode It is not connect with one end of the anode of second zener diode and the 6th resistance, the cathode difference of second zener diode It is connect with an input terminal of the drain electrode of second metal-oxide-semiconductor and circuit for power conversion, the other end ground connection of the 6th resistance, The capacitance of the third capacitor is 470pF, the model S-152T of the third diode.

In the computer described in the utility model with power supply protection function, the voltage regulator circuit further includes the 4th electricity Hold, one end of the 4th capacitor connect with the collector of the 4th triode, the other end of the 4th capacitor with it is described The grid of second metal-oxide-semiconductor connects, and the capacitance of the 4th capacitor is 430pF.

In the computer described in the utility model with power supply protection function, second triode is positive-negative-positive three Pole pipe, the third transistor are NPN type triode, and the 4th triode is PNP type triode, and second metal-oxide-semiconductor is P Channel MOS tube.

In the computer described in the utility model with power supply protection function, the protection circuit includes the five or three pole Pipe, the 6th triode, the 7th triode, the 7th resistance, the 8th resistance, the 9th resistance, the 4th zener diode, the five or two pole Pipe, the 5th capacitor and the 6th capacitor, the collector of the 7th triode respectively with the output end of the DC power supply circuit, the One end of the anode of five diodes and the 9th resistance connection, the other end of the 9th resistance respectively with the 5th capacitor one End, the cathode of the 4th zener diode, the 6th capacitor one end connected with the base stage of the 6th triode, the 5th capacitor it is another One end ground connection, the anode of the 4th zener diode connect with the base stage of one end of the 7th resistance and the 5th triode respectively It connecing, the other end, the emitter of the 5th triode and the emitter of the 6th triode of the 7th resistance are grounded, and the described 5th The collector of triode is connect with the other end of the 6th capacitor, and the collector of the 6th triode is respectively with the described 5th The cathode of diode, the 7th triode base stage connected with one end of the 8th resistance, the other end of the 8th resistance ground connection, institute The emitter of the 7th triode is stated as voltage output end, the model S-202T of the 5th diode, the 6th capacitor Capacitance be 360pF, the resistance value of the 8th resistance is 22k Ω, and the resistance value of the 9th resistance is 33k Ω.

In the computer described in the utility model with power supply protection function, the protection circuit further includes the 7th electricity Hold, one end of the 7th capacitor connect with the collector of the 6th triode, the other end of the 7th capacitor with it is described The base stage of 7th triode connects, and the capacitance of the 7th capacitor is 250pF.

In the computer described in the utility model with power supply protection function, the protection circuit further includes the tenth electricity Resistance, one end of the tenth resistance are connect with the emitter of the 6th triode, the other end ground connection of the tenth resistance, institute The resistance value for stating the tenth resistance is 42k Ω.

In the computer described in the utility model with power supply protection function, the 5th triode, the six or three pole Pipe and the 7th triode are NPN type triode.

The computer with power supply protection function for implementing the utility model, has the advantages that due to setting main electricity Road plate is equipped with the first current rectifying and wave filtering circuit, switching circuit, freewheeling circuit, pulse generating circuit, voltage regulator circuit, power conversion electricity Road, the second current rectifying and wave filtering circuit, DC power supply circuit, protection circuit and single-chip microcontroller, switching circuit include the first triode, first Metal-oxide-semiconductor, the first DC power supply, the second DC power supply, third DC power supply, first resistor, second resistance, first capacitor, second Capacitor and first diode, for the switching circuit relative to traditional switching circuit, the component used is less, can drop in this way Low hardware cost, in addition, first diode and second resistance are used to carry out current-limiting protection, the second capacitor is for preventing the one or three Interference between pole pipe and the first metal-oxide-semiconductor, therefore circuit structure is relatively simple, cost is relatively low, the safety and reliability of circuit It is higher.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, it is also possible to obtain other drawings based on these drawings.

Fig. 1 is the structural representation that the utility model has main circuit board in computer one embodiment of power supply protection function Figure；

Fig. 2 is the circuit diagram of switching circuit in the embodiment；

Fig. 3 is the circuit diagram of voltage regulator circuit in the embodiment；

Fig. 4 is the circuit diagram that circuit is protected in the embodiment.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

In the computer embodiment that the utility model has power supply protection function, this has the calculating of power supply protection function Machine includes shell, is equipped with main circuit board in shell, and Fig. 1 is the structural schematic diagram of main circuit board, and in Fig. 1, main circuit board is equipped with First current rectifying and wave filtering circuit 1, switching circuit 2, freewheeling circuit 3, pulse generating circuit 4, voltage regulator circuit 5, circuit for power conversion 6, Second current rectifying and wave filtering circuit 7, DC power supply circuit 8, protection circuit 9 and single-chip microcontroller 10, wherein the first current rectifying and wave filtering circuit 1 Output end is connect with an input terminal of switching circuit 2, and the control terminal of switching circuit 2 is connect with the input terminal of freewheeling circuit 3, is continued One output end of current circuit 3 is connect with the input terminal of pulse generating circuit 4, the output end and switch electricity of pulse generating circuit 4 Another input terminal on road 2 connects, and the another output of freewheeling circuit 3 is connect with the input terminal of voltage regulator circuit 5, voltage regulator circuit 5 output end is connect with an input terminal of circuit for power conversion 6, the output end of circuit for power conversion 6 and the second rectifying and wave-filtering The input terminal of circuit 7 connects, and an output end of the second current rectifying and wave filtering circuit 7 is connect with the input terminal of DC power supply circuit 8, directly The output end of galvanic electricity source circuit 8 with protection circuit 9 input terminal connect, the another output of the second current rectifying and wave filtering circuit 7 and The input terminal of single-chip microcontroller 10 connects, and the output end of single-chip microcontroller 10 is connect with another input terminal of circuit for power conversion 6.

220V alternating current first passes around the first current rectifying and wave filtering circuit 1 and is rectified and become after being filtered direct current, switch electricity It is responsible for the connection of on-off direct current and freewheeling circuit 3 in road 2.Pulse generating circuit 4 is responsible for generating high frequency positive pulse, control switch The work of circuit 2.Switching circuit 2 is with high-frequency connecting and disconnecting, and when switching circuit 2 is connected, direct current passes through freewheeling circuit 3, The energy of direct current is converted into magnetic field energy at this time；When switching circuit 2 disconnects, direct current is truncated, the magnetic field energy around inductance Amount is converted into electric energy, thus electric energy needed for supplying subsequent conditioning circuit as freewheeling circuit 3.Meanwhile the electricity of the output end of freewheeling circuit 3 Pressure value feeds back to pulse generating circuit 4, and after the voltage value is higher than certain value, pulse generating circuit 4 no longer generates pulse, pause Work.Voltage regulator circuit 5 is used to obtain stable low-voltage DC.Above-mentioned single-chip microcontroller 10 is for realizing intelligent control.

Fig. 2 is the circuit diagram of switching circuit in the present embodiment, in Fig. 2, switching circuit 2 include the first triode Q1, First metal-oxide-semiconductor M1, the first DC power supply VCC, the second DC power supply VDD, third DC power supply VEE, first resistor R1, the second electricity Hinder R2, first capacitor C1, the second capacitor C2 and first diode D1, wherein the base stage of the first triode Q1 passes through first resistor R1 is connect with the first DC power supply VCC, and the emitter of the first triode Q1 is connect with the input terminal of freewheeling circuit 3, the one or three pole Control terminal CON of the emitter of pipe Q1 as switching circuit 2, the collector of the first triode Q1 is respectively with first diode D1's One end of cathode and the second capacitor C2 connection, the other end of the second capacitor C2 respectively with one end of second resistance R2 and the first MOS The grid of pipe M1 connects, and the source electrode of the anode of first diode D1, the other end of second resistance R2 and the first metal-oxide-semiconductor M1 is with the The drain electrode of two DC power supply VDD connections, the first metal-oxide-semiconductor M1 connects with one end of third DC power supply VEE and first capacitor C1 respectively It connects, the other end ground connection of first capacitor C1.

The switching circuit 2 is relative to traditional switching circuit, and the component used is less, and circuit structure is relatively simple, Hardware cost can be reduced in this way.First diode D1 is Current Limiting Diodes, for the collector current to the first triode Q1 Carry out current-limiting protection；Second capacitor C2 is coupled capacitor, dry between the first triode Q1 and the first metal-oxide-semiconductor M1 for preventing It disturbs；Second resistance R2 is current-limiting resistance, carries out current-limiting protection for the branch between the grid and source electrode to the first metal-oxide-semiconductor M1, Therefore the safety and reliability of circuit is higher.It is noted that in the present embodiment, the model S- of first diode D1 The capacitance of 183T, the second capacitor C2 are 500pF, and the resistance value of second resistance R2 is 30k Ω, certainly, in practical applications, first Diode D1 can select other models to have the diode of similar functions as the case may be, and the capacitance of the second capacitor C2 can To adjust accordingly as the case may be, the resistance value of second resistance R2 can adjust accordingly as the case may be.

When control terminal CON is low level, the transmitting extremely low level of the first triode Q1, and the base of the first triode Q1 Pole is pulled upward to the first DC power supply VCC by first resistor R1, and the first triode Q1 is in a saturated state, the first triode Q1's Current collection extremely low level, and the grid of the first metal-oxide-semiconductor M1 is connected to the collector of the first triode Q1 by the second capacitor C2, the The grid of one metal-oxide-semiconductor M1 is also low level, the first metal-oxide-semiconductor M1 conducting.

When control terminal CON is high level (usually 5V), the emitter of the first triode Q1 is also high level, the one or three The base stage of pole pipe Q1 is pulled upward to the first DC power supply VCC by first resistor R1, at this point, the emitter and base of the first triode Q1 Pole tension difference is 0V, and the first triode Q1 is in off state, and the grid of the first metal-oxide-semiconductor M1 passes through the second capacitor C2 and the one or two Pole pipe D1 is connected to the second DC power supply VDD, is high level, the first metal-oxide-semiconductor M1 cut-off.

It is noted that the first triode Q1 is NPN type triode in the present embodiment, the first metal-oxide-semiconductor M1 is P-channel Metal-oxide-semiconductor.Certainly, in practical applications, the first triode Q1 may be NPN type triode, and the first metal-oxide-semiconductor M1 may be N Channel MOS tube, but at this moment the structure of circuit also will accordingly change.

Fig. 3 is the circuit diagram of voltage regulator circuit in the present embodiment, and in Fig. 3, voltage regulator circuit 5 includes 3rd resistor R3, the Four resistance R4, the 5th resistance R5, the 6th resistance R6, the second triode Q2, third transistor Q3, the 4th triode Q4, the 2nd MOS Pipe M2, third capacitor C3, the second zener diode D2 and third diode D3, wherein one end of 3rd resistor R3 respectively with it is continuous The another output of current circuit 3 connects, the other end of 3rd resistor R3 respectively with one end and the four or three pole of the 4th resistance R4 The base stage of Q4 connects, and the other end of the 4th resistance R4 is connect with the collector of the second triode Q2, the transmitting of the second triode Q2 The emitter of pole and third transistor Q3 are grounded, the emitter of the 4th triode Q4 respectively with one end of 3rd resistor R3, One end of five resistance R5 is connected with the source electrode of the second metal-oxide-semiconductor M2, and the collector of the 4th triode Q4 is respectively with the 5th resistance R5's The other end, the second metal-oxide-semiconductor M2 grid connected with one end of third capacitor C3, the other end and third transistor of third capacitor C3 The collector of Q3 connects, and the base stage of third transistor Q3 is used as to generator terminal Standby.

The base stage of second triode Q2 is connect with the cathode of third diode D3, and the anode of third diode D3 is respectively with The connection of one end of the anode of two zener diode D2 and the 6th resistance R6, the cathode of the second zener diode D2 is respectively with second The drain electrode of metal-oxide-semiconductor M2 is connected with an input terminal of circuit for power conversion 6, the other end ground connection of the 6th resistance R6.

The voltage regulator circuit 5 is relative to traditional voltage regulator circuit, and the component used is less, and circuit structure is relatively simple, Hardware cost can be further decreased in this way.Third capacitor C3 is coupled capacitor, for preventing third transistor Q3 and the four or three Interference between pole pipe Q4, third diode D3 are Current Limiting Diodes, are limited for the base current to the second triode Q2 Stream protection, to further enhance the safety and reliability of circuit.It is noted that in the present embodiment, third capacitor C3's Capacitance is 470pF, the model S-152T of third diode D3, certainly, in practical applications, the capacitance of third capacitor C3 It can adjust accordingly as the case may be, it is similar that third diode D3 can select other models to have as the case may be The diode of function.

One end of 3rd resistor R3 receives the input voltage of the input terminal Vi1 of voltage regulator circuit 5, and by the defeated of voltage regulator circuit 5 Outlet Vo1 output voltage；Entire voltage regulator circuit 5 forms close ring, and the output par, c of voltage regulator circuit 5 is controlled and compensated, To guarantee the stabilization of output voltage.

When generator terminal Standby inputs standby signal, the base stage of third transistor Q3 is reverse-biased, and entire voltage regulator circuit 5 is in Standby mode does not consume power；When the base stage positively biased of third transistor Q3, the grid grade of the second metal-oxide-semiconductor M2 is pulled down, into conducting State, output voltage rise, when voltage rises to the sample circuit that is made of the second zener diode D2 and the 6th resistance R6 simultaneously When reaching sampled voltage point, pass through the feed circuit control being made of the second triode Q2, the 4th triode Q4 and the 4th resistance R4 The grid of the second metal-oxide-semiconductor M2 is made, thus the ducting capacity of the second metal-oxide-semiconductor M2 of control, by 3rd resistor R3, third capacitor C3, the The loop control of four resistance R4 composition and compensation circuit, make voltage regulator circuit 5 enter steady operation.The voltage regulator circuit 5 uses second Metal-oxide-semiconductor M2 adjusts pipe, can also stabilize the output voltage, can effectively improve when input only has tens millivolts with output voltage difference The efficiency of power supply, and realize Zero-power-consumption standby.

It is noted that the second triode Q2 is PNP type triode in the present embodiment, third transistor Q3 is NPN type Triode, the 4th triode Q4 are PNP type triode, and the second metal-oxide-semiconductor M2 is P-channel metal-oxide-semiconductor.Certainly, in practical applications, Two triode Q2 may be NPN type triode, and third transistor Q3 may be PNP type triode, the 4th triode Q4 It can be NPN type triode, the second metal-oxide-semiconductor M2 may be N-channel MOS pipe, but at this moment the structure of circuit also will accordingly occur Variation.

In the present embodiment, which further includes the 4th capacitor C4, one end of the 4th capacitor C4 and the 4th triode Q4 Collector connection, the other end of the 4th capacitor C4 connect with the grid of the second metal-oxide-semiconductor M2.4th capacitor C4 is coupled capacitor, For preventing the interference between the 4th triode Q4 and the second metal-oxide-semiconductor M2, further to enhance the safety of circuit and reliable Property.It is noted that the capacitance of the 4th capacitor C4 is 430pF in the present embodiment, certainly, in practical applications, the 4th electricity The capacitance for holding C4 can adjust accordingly as the case may be.

Fig. 4 is the circuit diagram that circuit is protected in the present embodiment, and in Fig. 4, which includes the 5th triode Q5, the 6th triode Q6, the 7th triode Q7, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the 4th zener diode D4, the 5th diode D5, the 5th capacitor C5 and the 6th capacitor C6, wherein the collector of the 7th triode Q7 respectively with direct current One end of the output end of source circuit 8, the anode of the 5th diode D5 and the 9th resistance R9 connects, the other end point of the 9th resistance R9 Not with one end of the 5th capacitor C5, the cathode of the 4th zener diode D4, one end of the 6th capacitor C6 and the 6th triode Q6 Base stage connection, the other end ground connection of the 5th capacitor C5, the anode of the 4th zener diode D4 one end with the 7th resistance R7 respectively It is connected with the base stage of the 5th triode Q5, the emitter and the 6th triode of the other end of the 7th resistance R7, the 5th triode Q5 The emitter of Q6 is grounded, and the collector of the 5th triode Q5 is connect with the other end of the 6th capacitor C6, the 6th triode Q6's Collector is connect with the cathode of the 5th diode D5, the base stage of the 7th triode Q7 and one end of the 8th resistance R8 respectively, and the 8th The other end of resistance R8 is grounded, and the emitter of the 7th triode Q7 is as voltage output end Vo2.

The protection circuit 9 is relative to traditional protection circuit, and the component used is less, and circuit structure is relatively simple, Hardware cost can be further reduced in this way.In addition, the 5th diode D5 is Current Limiting Diodes, for the 6th triode Q6 Collector current carry out current-limiting protection, the 6th capacitor C6 be coupled capacitor, for preventing the 5th triode Q5 and the six or three pole Interference between pipe Q6, the 8th resistance R8 are current-limiting resistance, carry out current-limiting protection for the base stage current limliting to the 7th triode Q7, 9th resistance R9 is current-limiting resistance, for carrying out current-limiting protection to the branch where the 5th capacitor C5, so that the safety of circuit Property and reliability are further enhanced.It is noted that in the present embodiment, the model S-202T of the 5th diode D5, The capacitance of 6th capacitor C6 is 360pF, and the resistance value of the 8th resistance R8 is 22k Ω, and the resistance value of the 9th resistance R9 is 33k Ω, when So, in practical applications, the 5th diode D5 can also select two poles of other models with similar functions as the case may be Pipe, the capacitance of the 6th capacitor C6 can adjust accordingly as the case may be, the resistance value and the 9th resistance of the 8th resistance R8 The resistance value of R9 can adjust accordingly as the case may be.

When the voltage of the input terminal Vi2 of the protection circuit 9 is lower than the threshold voltage of the 4th zener diode D4, the 4th is steady Diode D4 cut-off is pressed, interior no current passes through, and the 5th triode Q5 works in saturation state, the base stage electricity of the 6th triode Q6 Pressure is pulled low, and works in off state, on the input of the input terminal Vi2 of protection circuit 9 without influence, thus, normal operation Under, the input terminal Vi2 of protection circuit 9 is always lower than the breakdown voltage of the 4th zener diode D4, so the input of protection circuit 9 End Vi2 is normally inputted；When protecting the voltage of input terminal Vi2 of circuit 9 to be higher than the threshold voltage of the 4th zener diode D4, the Four zener diode D4 are breakdown, inside have electric current to pass through, and the 5th triode Q5 works in off state, the 6th triode Q6's Base voltage increases, and the 6th triode Q6 conducting works in saturation state, the voltage tune of the input terminal Vi2 for protecting circuit 9 The base voltage of the 7th whole triode Q7 is pulled low, and works in off state, the output end vo 2 of the protection circuit 9 without output, Achieve the purpose that overvoltage protection.

It is noted that in the present embodiment, the 5th triode Q5, the 6th triode Q6 and the 7th triode Q7 are NPN type triode.Certainly, in practical applications, the 5th triode Q5, the 6th triode Q6 and the 7th triode Q7 can also be equal For PNP type triode, but at this moment the structure of circuit also will accordingly change.

In the present embodiment, which further includes the 7th capacitor C7, one end of the 7th capacitor C7 and the 6th triode Q6 Collector connection, the other end of the 7th capacitor C7 connect with the base stage of the 7th triode Q7.7th capacitor C7 is coupled capacitor, For preventing the interference between the 6th triode Q6 and the 7th triode Q7, so that the safety and reliability of circuit obtains more It further increases.It is noted that the capacitance of the 7th capacitor C7 is 250pF, certainly, in practical application in the present embodiment In, the capacitance of the 7th capacitor C7 can adjust accordingly as the case may be.

In the present embodiment, which further includes the tenth resistance R10, one end of the tenth resistance R10 and the 6th triode The emitter of Q6 connects, the other end ground connection of the tenth resistance R10.Tenth resistance R10 is current-limiting resistance, for the 6th triode The emitter current of Q6 carries out current-limiting protection, to further enhance current limitation effect.It is noted that in the present embodiment, the tenth The resistance value of resistance R10 is 42k Ω, certainly, in practical applications, the resistance value of the tenth resistance R10 can also as the case may be into The corresponding adjustment of row.

It is noted that in the present embodiment, above-mentioned first current rectifying and wave filtering circuit 1, freewheeling circuit 3, pulse generating circuit 4, circuit for power conversion 6, the second current rectifying and wave filtering circuit 7 and DC power supply circuit 8 are all made of circuit structure in the prior art.

In short, there is the switching circuit 2 in the computer of power supply protection function to open relative to traditional for this in the present embodiment Powered-down road, the component used is less, and circuit structure is relatively simple, can reduce hardware cost in this way.In addition, the switch is electric Current Limiting Diodes, current-limiting resistance and coupled capacitor are equipped in road 2, therefore the safety and reliability of circuit is higher.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model Protection scope within.

Claims

1. a kind of computer with power supply protection function, which is characterized in that including shell, main circuit is equipped in the shell Plate, the main circuit board are equipped with the first current rectifying and wave filtering circuit, switching circuit, freewheeling circuit, pulse generating circuit, pressure stabilizing electricity Road, circuit for power conversion, the second current rectifying and wave filtering circuit, DC power supply circuit, protection circuit and single-chip microcontroller, the first rectification filter The output end of wave circuit is connect with an input terminal of the switching circuit, the control terminal of the switching circuit and afterflow electricity The input terminal on road connects, and an output end of the freewheeling circuit is connect with the input terminal of the pulse generating circuit, the arteries and veins The output end that circuit occurs for punching is connect with another input terminal of the switching circuit, the another output of the freewheeling circuit It is connect with the input terminal of the voltage regulator circuit, an input terminal of the output end of the voltage regulator circuit and the circuit for power conversion Connection, the output end of the circuit for power conversion are connect with the input terminal of second current rectifying and wave filtering circuit, second rectification One output end of filter circuit is connect with the input terminal of the DC power supply circuit, the output end of the DC power supply circuit with The input terminal connection of the protection circuit, the another output of second current rectifying and wave filtering circuit and the input of the single-chip microcontroller End connection, the output end of the single-chip microcontroller are connect with another input terminal of the circuit for power conversion；

The switching circuit includes the first triode, the first metal-oxide-semiconductor, the first DC power supply, the second DC power supply, third direct current The base stage of source, first resistor, second resistance, first capacitor, the second capacitor and first diode, first triode passes through institute It states first resistor to connect with first DC power supply, the emitter of first triode and the input terminal of the freewheeling circuit Connection, the collector of first triode are connect with one end of the cathode of the first diode and the second capacitor respectively, institute The other end for stating the second capacitor is connect with the grid of one end of the second resistance and the first metal-oxide-semiconductor respectively, the one or two pole The source electrode of the anode of pipe, the other end of second resistance and the first metal-oxide-semiconductor is connect with second DC power supply, and described first The drain electrode of metal-oxide-semiconductor is connect with one end of the third DC power supply and first capacitor respectively, another termination of the first capacitor Ground, the model S-183T of the first diode, the capacitance of second capacitor are 500pF, the resistance of the second resistance Value is 30k Ω.

2. the computer according to claim 1 with power supply protection function, which is characterized in that first triode is NPN type triode, first metal-oxide-semiconductor are P-channel metal-oxide-semiconductor.

3. the computer according to claim 1 with power supply protection function, which is characterized in that the voltage regulator circuit includes 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the second triode, third transistor, the 4th triode, the 2nd MOS Pipe, third capacitor, the second zener diode and third diode, one end of the 3rd resistor respectively with the freewheeling circuit Another output connection, the other end of the 3rd resistor base with one end of the 4th resistance and the 4th triode respectively Pole connection, the other end of the 4th resistance are connect with the collector of second triode, the transmitting of second triode The emitter of pole and third transistor is grounded, the emitter of the 4th triode respectively with one end of the 3rd resistor, One end of 5th resistance is connected with the source electrode of the second metal-oxide-semiconductor, the collector of the 4th triode respectively with the 5th resistance The other end, the second metal-oxide-semiconductor grid connected with one end of third capacitor, the other end of the third capacitor and the described 3rd 3 The collector of pole pipe connects, and the base stage of the third transistor is used as to generator terminal；

The base stage of second triode is connect with the cathode of the third diode, the anode of the third diode respectively with The connection of one end of the anode of second zener diode and the 6th resistance, the cathode of second zener diode respectively with institute The drain electrode for stating the second metal-oxide-semiconductor is connected with an input terminal of circuit for power conversion, the other end ground connection of the 6th resistance, described The capacitance of third capacitor is 470pF, the model S-152T of the third diode.

4. the computer according to claim 3 with power supply protection function, which is characterized in that the voltage regulator circuit also wraps Include the 4th capacitor, one end of the 4th capacitor is connect with the collector of the 4th triode, the 4th capacitor it is another End is connect with the grid of second metal-oxide-semiconductor, and the capacitance of the 4th capacitor is 430pF.

5. the computer according to claim 4 with power supply protection function, which is characterized in that second triode is PNP type triode, the third transistor be NPN type triode, the 4th triode be PNP type triode, described second Metal-oxide-semiconductor is P-channel metal-oxide-semiconductor.

6. according to claim 1 to the computer described in 5 any one with power supply protection function, which is characterized in that described Protecting circuit includes the 5th triode, the 6th triode, the 7th triode, the 7th resistance, the 8th resistance, the 9th resistance, the 4th Zener diode, the 5th diode, the 5th capacitor and the 6th capacitor, the collector of the 7th triode respectively with the direct current One end of the output end of power circuit, the anode of the 5th diode and the 9th resistance connects, the other end point of the 9th resistance Not with the cathode, one end of the 6th capacitor and the base stage of the 6th triode of one end of the 5th capacitor, the 4th zener diode Connection, the 5th capacitor the other end ground connection, the anode of the 4th zener diode respectively with the 7th resistance one End is connected with the base stage of the 5th triode, the emitter and the 6th triode of the other end of the 7th resistance, the 5th triode Emitter be grounded, the collector of the 5th triode is connect with the other end of the 6th capacitor, the six or three pole The collector of pipe is connect with cathode, the base stage of the 7th triode and one end of the 8th resistance of the 5th diode respectively, institute State the other end ground connection of the 8th resistance, the emitter of the 7th triode as voltage output end, the 5th diode Model S-202T, the capacitance of the 6th capacitor are 360pF, and the resistance value of the 8th resistance is 22k Ω, the 9th electricity The resistance value of resistance is 33k Ω.

7. the computer according to claim 6 with power supply protection function, which is characterized in that the protection circuit also wraps Include the 7th capacitor, one end of the 7th capacitor is connect with the collector of the 6th triode, the 7th capacitor it is another End is connect with the base stage of the 7th triode, and the capacitance of the 7th capacitor is 250pF.

8. the computer according to claim 7 with power supply protection function, which is characterized in that the protection circuit also wraps Include the tenth resistance, one end of the tenth resistance is connect with the emitter of the 6th triode, the tenth resistance it is another End ground connection, the resistance value of the tenth resistance are 42k Ω.

9. the computer according to claim 6 with power supply protection function, which is characterized in that the 5th triode, 6th triode and the 7th triode are NPN type triode.