CN107219882A - A kind of positive-negative power with short-circuit protection function - Google Patents
A kind of positive-negative power with short-circuit protection function Download PDFInfo
- Publication number
- CN107219882A CN107219882A CN201710566092.3A CN201710566092A CN107219882A CN 107219882 A CN107219882 A CN 107219882A CN 201710566092 A CN201710566092 A CN 201710566092A CN 107219882 A CN107219882 A CN 107219882A
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- Prior art keywords
- positive
- power supply
- voltage stabilizing
- stabilizing chip
- circuit
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/625—Regulating voltage or current wherein it is irrelevant whether the variable actually regulated is ac or dc
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Rectifiers (AREA)
Abstract
The positive-negative power with short-circuit protection function of the present invention; including transformer, rectification circuit, accessory power supply mu balanced circuit, out-put supply mu balanced circuit, operational amplifier U1, operational amplifier U2, positive-negative-positive switch triode T1 and NPN type switch triode T2; accessory power supply mu balanced circuit is made up of PV3 and PV4, and out-put supply mu balanced circuit is made up of PV1 PV2；PV3, PV4 output end form accessory power supply positive and negative electrode respectively, and T1, T2 colelctor electrode form out-put supply positive and negative electrode respectively.The positive-negative power with short-circuit protection function of the present invention; when there is shorted to earth state in negative or positive electrode; the output that can cut off the electricity supply simultaneously keeps low level state; after short trouble disappears; it back to normal can power again, realize effective protection to component, extend the service life of power supply; beneficial effect significantly, is suitable for the application of popularization.
Description
Technical field
The present invention relates to a kind of positive-negative power with short-circuit protection function, in particular, more particularly to one kind passes through
Compare the change of output voltage to recognize that what short circuit and turning off by switch triode accordingly exported has short-circuit protection function
Positive-negative power.
Background technology
Voltage-stabilized power supply is used to provide constant voltage output to electrical equipment or power circuit, in the voltage-stabilized power supply course of work
In, it may appear that the situation of output terminal shortcircuit；Such as the voltage-stabilized power supply exported with positive and negative end, when the positive output of power supply
When end or negative output terminal shorted to earth, if the output do not cut off the electricity supply, the damage of component in voltage-stabilized power supply, shadow are easily caused
The normal of voltage-stabilized power supply is rung to use.
The content of the invention
There is provided a kind of positive negative electricity with short-circuit protection function in order to overcome the shortcoming of above-mentioned technical problem by the present invention
Source.
The positive-negative power with short-circuit protection function of the present invention, including transformer, rectification circuit, accessory power supply voltage stabilizing electricity
Road, out-put supply mu balanced circuit, operational amplifier U1, operational amplifier U2, positive-negative-positive switch triode T1 and NPN type switch three
Pole pipe T2, the primary side of transformer is connected on alternating current, and the two ends of secondary side are connected with rectification circuit；It is characterized in that：Institute
State accessory power supply mu balanced circuit to be made up of the positive voltage stabilizing chip PV3 of accessory power supply and the negative voltage stabilizing chip PV4 of accessory power supply, the output
Power supply stabilization circuit is born voltage stabilizing chip PV2 by the positive voltage stabilizing chip PV1 of out-put supply and out-put supply and constituted, one of rectification circuit
Output end is connected with PV1 and PV2 input, and another output end is connected with PV2 and PV4 input；
PV3, PV4 output end form accessory power supply positive pole, accessory power supply negative pole respectively, and PV1 output is through inductance L1 and switch
Triode T1 emitter stage is connected, and PV2 output is connected through inductance L2 with switch triode T2 emitter stage, T1 current collection
Pole, T2 colelctor electrode form out-put supply positive pole and out-put supply negative pole respectively；Electricity is connected between accessory power supply positive pole and ground wire
R5 and resistance R6 series loop is hindered, resistance R8 and resistance R7 series loop are connected between accessory power supply negative pole and ground wire；It is defeated
Go out between positive source and ground wire to be connected to resistance R9 and resistance R10 series loop, be connected between out-put supply negative pole and ground wire
Resistance R12 and resistance R11 series loop；
R9 and R10 junction UAIt is connected with U1 inverting input, R5 and R6 junction UBWith U1 in-phase input end
It is connected；R11 and R12 junction UCIt is connected with U2 inverting input, R7 and R8 junction UDWith U2 homophase input
End is connected；U1 output end is connected through resistance R3 with T1 base stage, and U2 output end is connected through resistance R4 with T2 base stage
Connect, the series circuit of R1 and LED 1, T2 emitter stage and current collection are parallel between T1 emitter stage and colelctor electrode
The series circuit of R2 and LED 2 is parallel between pole；Resistance R5, R6, R7, R8, R9, R10, R11, R12 resistance
Choose and meet：When accessory power supply mu balanced circuit and out-put supply mu balanced circuit stabilization are exported, UA＞ UB, UC＜ UD。
The present invention the positive-negative power with short-circuit protection function, shown rectification circuit for by diode D1, diode D2,
The bridge rectifier of diode D3 and diode D4 compositions, two output ends and ground wire of bridge rectifier are respectively through electric capacity E1
Electric capacity E2 is connected, and E1, E2 are used to realize rectification, filter action.
The positive-negative power with short-circuit protection function of the present invention, the positive voltage stabilizing chip PV1 of out-put supply, out-put supply
Negative voltage stabilizing chip PV2, the positive voltage stabilizing chip PV3 of accessory power supply and accessory power supply are born between voltage stabilizing chip PV4 output end and ground wire
The electric capacity E5 for realizing filter action, electric capacity E6, electric capacity E3 and electric capacity E4 are in series with respectively；The out-put supply positive pole and output electricity
The electric capacity E7 and electric capacity E8 for realizing filter action are in series between source negative pole and ground wire.
The positive-negative power with short-circuit protection function of the present invention, the positive voltage stabilizing chip PV1 of out-put supply and output electricity
Source bears voltage stabilizing chip PV2 and is respectively adopted the voltage stabilizing chip of model 7812,7912, the positive voltage stabilizing chip PV3 of accessory power supply and
Accessory power supply bears the voltage stabilizing chip that model 78L12,79L12 is respectively adopted in voltage stabilizing chip PV4.
The beneficial effects of the invention are as follows：The positive-negative power with short-circuit protection function of the present invention, the output of rectification circuit,
Through the positive voltage stabilizing chip PV3 of accessory power supply, negative voltage stabilizing chip PV4 formation accessory power supplys positive pole, negative pole, through the positive voltage stabilizing core of out-put supply
Piece PV1, negative voltage stabilizing chip PV2 formation out-put supplies positive pole, negative pole；When out-put supply positive pole shorted to earth, operational amplifier
U1 output is changed into high level from low level so that the positive voltage stabilizing chip PV1 of out-put supply output cut-off, and passes through R1 loops
Conducting keeps the low-voltage state of out-put supply positive pole；When out-put supply negative pole shorted to earth, operational amplifier U2 output
Low level is changed into from high level so that out-put supply bears voltage stabilizing chip PV2 output cut-off, and is kept by the conducting in R2 loops
The low-voltage state of out-put supply negative pole；When short trouble disappears, out-put supply positive pole, the output of negative pole can recover just again
Often.
The positive-negative power with short-circuit protection function of the present invention, when shorted to earth state occurs in negative or positive electrode
When, the output that can cut off the electricity supply simultaneously keeps low level state, after short trouble disappears, back to normal can power, realizes again
Effective protection to component, extends the service life of power supply, and beneficial effect significantly, is suitable for the application of popularization.
Brief description of the drawings
Fig. 1 is the circuit diagram of the positive-negative power with short-circuit protection function of the present invention.
In figure：1 transformer, 2 ground wires, 3 accessory power supply positive poles, 4 accessory power supply negative poles, 5 out-put supply positive poles, 6 output electricity
Source negative pole, the positive voltage stabilizing chip PV1 of 7 out-put supplies, 8 out-put supplies bear voltage stabilizing chip PV2, the positive voltage stabilizing chip PV3 of 9 accessory power supplys,
10 accessory power supplys bear voltage stabilizing chip PV4,11 operational amplifier U1,12 operational amplifier U2.
Embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, giving the circuit diagram of the positive-negative power with short-circuit protection function of the present invention, it is by transformer
1st, rectification circuit, accessory power supply mu balanced circuit, out-put supply mu balanced circuit, operational amplifier U1, operational amplifier U2, switch three
Pole pipe T1, switch triode T2 are constituted, and the primary side of transformer 1 is connected with AC power, and secondary side is connected with finishing circuit
Connect；Accessory power supply mu balanced circuit is by the positive voltage stabilizing chip PV3 of accessory power supply（9）Voltage stabilizing chip PV4 is born with accessory power supply（10）Composition,
PV3, PV4 are respectively used to produce positive and negative voltage output.Out-put supply mu balanced circuit is by the positive voltage stabilizing chip PV1 of out-put supply（7）With
Out-put supply bears voltage stabilizing chip PV2（8）Composition, PV1, PV2 are respectively used to produce positive and negative voltage output.Switch triode T1, open
Close triode T2 and PNP type triode and NPN type triode is respectively adopted.
Shown rectification circuit is using the bridge rectifier of 4 diode D1, D2, D3 and D4 compositions, the negative pole of diode
It is connected with PV1 and PV3 input, the positive pole of diode is connected with PV2 and PV4 input, to realize to steady
Press chip PV1, PV2, PV3, PV4 power supply.Capacitor E1 and electric capacity are in series with respectively between the two ends of rectification circuit and ground wire 2
Device E2, to realize the rectification to out-put supply after rectification and filter action.
The output end of voltage stabilizing chip PV3, PV4 forms accessory power supply positive pole 3 and accessory power supply negative pole 4, accessory power supply respectively
Positive pole 3 and accessory power supply negative pole 4 are used to provide stable reference power source, are connected respectively between PV3, PV4 output end and ground wire 2
There is the capacitor E3 and E4 strobed.Emitter stage of the voltage stabilizing chip PV1 output end through inductance L1 Yu switch triode T1
It is connected, T1 colelctor electrode formation out-put supply positive pole 5（UO+）；Voltage stabilizing chip PV2 output is through inductance L2 and switch triode
T2 emitter stage is connected, and T2 colelctor electrode is used to form out-put supply negative pole 6（UO-）.The output end of voltage stabilizing chip PV1, PV2
It is in series with capacitor E5 and capacitor E6 respectively between ground wire 2, capacitor E5, E6 are used to realize filter action.Out-put supply
Positive pole 5（UO+）For externally exporting positive supply, out-put supply negative pole 6（UO-）For externally exporting auxiliary power supply；UO+With ground wire it
Between, UO-Capacitor E7 and capacitor E8 are in series with respectively between ground wire, to realize the filter action to out-put supply.
Resistance R5 and resistance R6, accessory power supply negative pole 4 and ground wire 2 have been sequentially connected in series between accessory power supply positive pole 3 and ground wire 2
Between be sequentially connected in series resistance R8 and resistance R7；UO+Resistance R9 and resistance R10, U have been sequentially connected in series between ground wireO-With ground wire
Between be sequentially connected in series resistance R11 and resistance R12.R9 and R10 junction UAIt is connected with U1 inverting input, R5 and R6
Junction UBIt is connected with U1 in-phase input end；R11 and R12 junction UCBe connected with U2 inverting input, R7 with
R8 junction UDIt is connected with U2 in-phase input end,
U1 output end is connected through resistance R3 with T1 base stage, and U2 output end is connected through resistance R4 with T2 base stage, electricity
Resistance R3 and resistance R4 realizes the metering function of switch triode T1 and T2 base stage respectively.It is in parallel between T1 emitter stage and colelctor electrode
There is the series circuit of R1 and LED 1, R2 and LED 2 are parallel between T2 emitter stage and colelctor electrode
Series circuit；Resistance R5, R6, R7, R8, R9, R10, R11, R12 resistance, which are chosen, to be met：Accessory power supply mu balanced circuit and defeated
When going out power supply stabilization circuit stabilization output, UA＞ UB, UC＜ UD。
During work：Work as UO+During to the short circuit of ground wire 2, due to L1 reactance characteristic, UO+It is very low, UAAlso it is very low, the high electricity of U1 outputs
It is flat, so that T1 is turned off, the output of positive supply is cut off, main power source is protected.LED1 lights simultaneously, produces alarm signal, R1 places
The conducting in loop, can make U during short circuit againO+Keep low-voltage.When short trouble disappears, UO+Voltage is raised, and U1 exports low electricity
Flat, T1 saturation conductions, power up is normal.
Work as UO-During to the short circuit of ground wire 2, due to L2 reactance characteristic, UO-Close to 0 current potential, UCRise, U2 output low levels,
So as to T2 shut-offs, the output of negative supply is cut off, main power source is protected.LED2 lights simultaneously, produces loop where alarm signal, R2
Conducting, U during short circuit can be made againO-Keep low-voltage.When short trouble disappears, UO-Voltage recovers normal, the high electricity of U2 outputs
Flat, T2 saturation conductions, power supply output recovers normal.
Claims (4)
1. a kind of positive-negative power with short-circuit protection function, including transformer（1）, rectification circuit, accessory power supply mu balanced circuit,
Out-put supply mu balanced circuit, operational amplifier U1（11）, operational amplifier U2（12）, positive-negative-positive switch triode T1 and NPN type open
Triode T2 is closed, the primary side of transformer is connected on alternating current, and the two ends of secondary side are connected with rectification circuit；Its feature exists
In：The accessory power supply mu balanced circuit is by the positive voltage stabilizing chip PV3 of accessory power supply（9）Voltage stabilizing chip PV4 is born with accessory power supply（10）
Composition, the out-put supply mu balanced circuit is by the positive voltage stabilizing chip PV1 of out-put supply（7）Voltage stabilizing chip PV2 is born with out-put supply（8）
Composition a, output end of rectification circuit is connected with PV1 and PV2 input, and another output end is defeated with PV2's and PV4
Enter end to be connected；
PV3, PV4 output end form accessory power supply positive pole respectively（3）, accessory power supply negative pole（4）, PV1 output is through inductance L1
It is connected with switch triode T1 emitter stage, PV2 output is connected through inductance L2 with switch triode T2 emitter stage, T1
Colelctor electrode, T2 colelctor electrode form out-put supply positive pole respectively（5）With out-put supply negative pole（6）；Accessory power supply positive pole and ground
Resistance R5 and resistance R6 series loop are connected between line, is connected to resistance R8's and resistance R7 between accessory power supply negative pole and ground wire
Series loop；Resistance R9 and resistance R10 series loop, out-put supply negative pole and ground are connected between out-put supply positive pole and ground wire
Resistance R12 and resistance R11 series loop are connected between line；
R9 and R10 junction UAIt is connected with U1 inverting input, R5 and R6 junction UBWith U1 in-phase input end phase
Connection；R11 and R12 junction UCIt is connected with U2 inverting input, R7 and R8 junction UDWith U2 in-phase input end
It is connected；U1 output end is connected through resistance R3 with T1 base stage, and U2 output end is connected through resistance R4 with T2 base stage,
Be parallel with the series circuit of R1 and LED 1 between T1 emitter stage and colelctor electrode, T2 emitter stage and colelctor electrode it
Between be parallel with the series circuit of R2 and LED 2；Resistance R5, R6, R7, R8, R9, R10, R11, R12 resistance are chosen
Meet：When accessory power supply mu balanced circuit and out-put supply mu balanced circuit stabilization are exported, UA＞ UB, UC＜ UD。
2. the positive-negative power according to claim 1 with short-circuit protection function, it is characterised in that：Shown rectification circuit is
The bridge rectifier being made up of diode D1, diode D2, diode D3 and diode D4, two outputs of bridge rectifier
End is connected through electric capacity E1 electric capacity E2 respectively with ground wire, and E1, E2 are used to realize rectification, filter action.
3. the positive-negative power according to claim 1 or 2 with short-circuit protection function, it is characterised in that：The output electricity
The positive voltage stabilizing chip PV1 in source（7）, out-put supply bear voltage stabilizing chip PV2（8）, the positive voltage stabilizing chip PV3 of accessory power supply（9）With auxiliary electricity
Bear voltage stabilizing chip PV4 in source（10）Output end and ground wire between be in series with the electric capacity E5 for realizing filter action, electric capacity E6, electricity respectively
Hold E3 and electric capacity E4；The out-put supply positive pole（5）With out-put supply negative pole（6）It is in series between ground wire and realizes filter action
Electric capacity E7 and electric capacity E8.
4. the positive-negative power according to claim 1 or 2 with short-circuit protection function, it is characterised in that：The output electricity
The positive voltage stabilizing chip PV1 in source（7）Voltage stabilizing chip PV2 is born with out-put supply（8）The voltage stabilizing core of model 7812,7912 is respectively adopted
Piece, the positive voltage stabilizing chip PV3 of accessory power supply（9）Voltage stabilizing chip PV4 is born with accessory power supply（10）Model is respectively adopted
78L12,79L12 voltage stabilizing chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710566092.3A CN107219882A (en) | 2017-07-12 | 2017-07-12 | A kind of positive-negative power with short-circuit protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710566092.3A CN107219882A (en) | 2017-07-12 | 2017-07-12 | A kind of positive-negative power with short-circuit protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107219882A true CN107219882A (en) | 2017-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710566092.3A Pending CN107219882A (en) | 2017-07-12 | 2017-07-12 | A kind of positive-negative power with short-circuit protection function |
Country Status (1)
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| CN (1) | CN107219882A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110703839A (en) * | 2019-11-08 | 2020-01-17 | 中电科仪器仪表有限公司 | Power supply and power supply method of universal ultra-low noise radio frequency circuit |
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2017
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| DE4039990A1 (en) * | 1990-12-14 | 1992-06-17 | Merten Gmbh & Co Kg Geb | Overload and short-circuit protection system for MOSFET load switch - uses voltage across measuring resistance for automatic cut=out of working current path |
| CN101656414A (en) * | 2008-08-20 | 2010-02-24 | 鸿富锦精密工业（深圳）有限公司 | Power protection device |
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| CN110703839A (en) * | 2019-11-08 | 2020-01-17 | 中电科仪器仪表有限公司 | Power supply and power supply method of universal ultra-low noise radio frequency circuit |
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Application publication date: 20170929 |
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