CN105827105B - A kind of circuit for realizing exchange input pressure limiting using on-off mode - Google Patents
A kind of circuit for realizing exchange input pressure limiting using on-off mode Download PDFInfo
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- CN105827105B CN105827105B CN201610299474.XA CN201610299474A CN105827105B CN 105827105 B CN105827105 B CN 105827105B CN 201610299474 A CN201610299474 A CN 201610299474A CN 105827105 B CN105827105 B CN 105827105B
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- 239000003381 stabilizer Substances 0.000 claims abstract description 49
- 230000005669 field effect Effects 0.000 claims abstract description 15
- 239000004065 semiconductor Substances 0.000 claims description 21
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 230000001629 suppression Effects 0.000 claims description 4
- 230000001052 transient effect Effects 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000007600 charging Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
- H02M1/346—Passive non-dissipative snubbers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Emergency Protection Circuit Devices (AREA)
- Electronic Switches (AREA)
- Rectifiers (AREA)
Abstract
The present invention discloses a kind of circuit for realizing exchange input pressure limiting using on-off mode comprising input circuit module, rectification circuit module, comparison circuit module, field-effect tube drive circuit module, on-off circuit module and output circuit module；Input circuit module input AC input voltage, output is to comparison circuit module after rectified circuit module rectification, and is finally exported through output circuit module；Field-effect tube drive circuit module and on-off circuit module are connected on the current supply circuit between comparison circuit module and output end line module；Comparison circuit module has voltage comparing function by the way that voltage-stabiliser tube is arranged, less than the voltage signal that voltage compares threshold value, load supplying circuit can be made to be connected, and the voltage signal for comparing threshold value higher than voltage will be so that comparison circuit module output Continuity signal, and then the MOS switch pipe shutdown being serially connected on former current supply circuit is driven, disconnect current supply circuit.Circuit of the present invention is small, efficient, and calorific value is low, and cost is very low.
Description
Technical field
The present invention relates to protection rear class electrification controls to protect equipment technical field, especially a kind of for photovoltaic, rail traffic
Equal Alternating Current Power Supplies fluctuate the circuit that exchange input pressure limiting is realized using on-off mode of larger occasion.
Background technology
In photovoltaic system application, when case low pressure side switchs tripping, the electrified control in photovoltaic area protect equipment this moment by
Photovoltaic DC-to-AC converter is powered.But since photovoltaic DC-to-AC converter abruptly enters island mode operation, the alternating current moment lift of output can be caused
450VAC is risen to, 3 cycles are continued, to puncture the supply input circuit that equipment is protected in electrified control, causes equipment damage and warp
Ji loss, and photovoltaic system is allowed to be detached from protection operation.
In application in track transportation, electrification control protects equipment by mains-supplied, and certain applied field mould assembling become design of transformer not
When reasonable, fluctuation caused by primary voltage changes due to load will have a direct impact on secondary voltage, and secondary voltage can be raised to
320VAC or so continues 30 minutes or so, and the operation of long-time overvoltage can puncture electrified control and protect equipment supply input circuit, make
Forming apparatus damages and economic loss, and Rail Transit System is allowed to be detached from protection operation.
GPF (General Protection False mode is to control to protect front equipment end and silicon chain in electrification, is limited by the linear voltage regulation way of silicon chain defeated
Enter voltage, the disadvantage is that volume is big, efficiency is low, and fever is severe, and of high cost.
Invention content
The technical problem to be solved in the present invention is：Input voltage is limited using on-off mode, is passed in current supply circuit.Circuit
Small, efficient, calorific value is low, and cost is very low.
The technical solution that the present invention takes is specially：A kind of circuit for realizing exchange input pressure limiting using on-off mode, packet
Include input circuit module, rectification circuit module, comparison circuit module, field-effect tube drive circuit module, on-off circuit module and
Output circuit module；
The input terminal input AC input voltage of the input circuit module, after rectified circuit module rectification output to than
It compared with circuit module, and is finally exported through output circuit module, forms load supplying circuit；Output circuit module includes being connected to it
Storage capacitor between voltage signal output end；Field-effect tube drive circuit module and on-off circuit module are connected to comparison circuit
On load supplying circuit between module and output end line module；
Comparison circuit module includes current-limiting resistance between being serially connected with its voltage signal inputs and 1 or more voltage-stabiliser tube；
The node that current-limiting resistance connects with multiple voltage-stabiliser tubes is conducting output node；The sum of voltage stabilizing value of all voltage-stabiliser tubes is that voltage compares
Threshold value；The voltage signal for comparing threshold value higher than voltage for being input to comparison circuit module may make conducting output node output
High level, on the contrary it is low level；
The metal-oxide-semiconductor driving circuit for connecting aforementioned conducting output node is equipped in field-effect tube drive circuit module；Switch electricity
Road unit includes the first MOS switch pipe and the second MOS switch pipe for connecting above-mentioned metal-oxide-semiconductor driving circuit；Second MOS switch pipe
Drain electrode and source electrode are serially connected on load supplying circuit；
Output node output high level is connected in comparison circuit module may make metal-oxide-semiconductor driving circuit that the first MOS is driven to open
Close pipe conducting, the second MOS switch pipe shutdown, to disconnect load supplying circuit, the electricity that storage capacitor passes through output circuit module
Press signal output end electric discharge；Output node output low level is connected in comparison circuit module may make metal-oxide-semiconductor driving circuit to drive
First MOS switch pipe turns off, and the conducting of the second MOS switch pipe so that load supplying circuit is connected, while being filled for storage capacitor
Electricity.
The present invention is in use, the sum of voltage stabilizing value of all voltage-stabiliser tubes is that voltage compares threshold in comparison circuit module
Value, the half-wave voltage signal of threshold value is compared less than voltage will not lead to the conducting of the first MOS switch pipe, then the second MOS switch
Manage in the conduction state, voltage exports after the source-drain electrode of the second MOS switch pipe from output circuit module, while storage capacitor fills
Electricity；When AC-input voltage compares threshold value higher than voltage, voltage-stabiliser tube will be breakdown, under the action of driving circuit, the first MOS
Switching tube is connected, and then the second MOS switch pipe turns off, then former load supplying circuit is cut off, and turns to be discharged by storage capacitor, after being
Continuous circuit provides electric energy.
Further, in the present invention, input circuit module includes input protective unit, and the input protective unit includes point
It is not connected across the safety capacitance between power firestreak and ground terminal and between zero-power line and ground terminal, is connected to power firestreak
Varistor between zero curve, and the fuse and varistor that are serially connected on power firestreak.Input the setting of protective unit
For suppression common mode interference and surge.
The rectification circuit module includes rectifier bridge, and the AC-input voltage signal rectification of 50HZ is 100HZ by rectifier bridge
Half-wave voltage signal.
In comparison circuit module, five voltage-stabiliser tubes mutually concatenate, and the anode of voltage-stabiliser tube is towards the voltage signal after rectified
Anode, cathode is towards current-limiting resistance.
Further, in the present invention, the metal-oxide-semiconductor driving circuit includes the grid and source electrode for being connected to the first metal-oxide-semiconductor
On voltage-stabiliser tube D7 and the voltage-stabiliser tube D18 that is connected on the grid and source electrode of the second MOS switch pipe；
The anode of voltage-stabiliser tube D7 connect the conducting output node of comparison circuit module with the grid of the first MOS switch pipe；Surely
The cathode of pressure pipe D7 connect the cathode in load supplying circuit with the source electrode of the first MOS switch pipe；
The anode of voltage-stabiliser tube D18 connect the anode in load supplying circuit, voltage-stabiliser tube D18 with the grid of the second MOS switch pipe
Cathode connection load supplying circuit cathode, the source electrode and drain electrode of the second MOS switch pipe is serially connected in the negative of load supplying circuit
Polar curve road；Voltage-stabiliser tube D7 and D18 are for protecting the grid source electrode of field-effect tube Q1 and Q2 not breakdown；
And first the drain electrode of MOS switch pipe be connected with the grid of the second MOS switch pipe so that the first MOS switch pipe Q1 at
For a part for the driving circuit of the second MOS switch pipe Q2.
Further, metal-oxide-semiconductor driving circuit of the present invention further includes the filter circuit being made of resistance R5 and capacitance C4, capacitance
The both ends C4 are attempted by the both ends voltage-stabiliser tube D18, and resistance R5 is serially connected between voltage-stabiliser tube D18 and the grid of the second MOS switch pipe；Together
When capacitance C4 in the energy that stores be used for driving FET Q2；
Anode of the voltage-stabiliser tube D18 anodes through current-limiting resistance connection load supplying circuit.
Further, it is gone back in the source electrode and drain electrode of the second MOS switch pipe of the invention and is connected to switching tube protective unit, switched
Pipe protective unit is composed in series by Transient Suppression Diode and resistance, can be used for protecting field-effect tube.
Preferably, the first MOS switch pipe and the second MOS switch pipe are all NMOS tube in the present invention.The switching tube of NMOS has
There is the characteristics of switching speed is fast, and rated current is big, high pressure.
Beneficial effects of the present invention are：Circuit design is simple, and safety in operation is higher, can ensure that rear class electrification control is protected
Equipment long-term running safety and reliability under complicated voltage environment.And circuit of the present invention is small, pressure limiting is efficient,
Calorific value is small, at low cost.
Description of the drawings
Fig. 1 show a kind of electrical block diagram of specific embodiment of the present invention.
Specific implementation mode
It is further described below in conjunction with the drawings and specific embodiments.
With reference to figure 1, the present invention realizes the circuit of exchange input pressure limiting using on-off mode, including input circuit module 1, whole
Current circuit module 2, comparison circuit module 3, field-effect tube drive circuit module 4, on-off circuit module 5 and output circuit module 6；
The input terminal input AC input voltage of input circuit module 1, output is to comparing after 2 rectification of rectified circuit module
Circuit module 3, and finally exported through 6 module of output circuit, form load supplying circuit；Output circuit module 6 includes being connected to
Storage capacitor C15 between its voltage signal output end；Field-effect tube drive circuit module 4 and on-off circuit module 5 are connected to
On load supplying circuit between comparison circuit module 3 and output end line module 6；
Comparison circuit module 3 includes the current-limiting resistance R7 being serially connected between its voltage signal inputs and 1 or more voltage stabilizing
Pipe；The node that current-limiting resistance R7 connects with multiple voltage-stabiliser tubes is conducting output node；The sum of voltage stabilizing value of all voltage-stabiliser tubes is electricity
Pressure ratio is compared with threshold value；The voltage signal for comparing threshold value higher than voltage for being input to comparison circuit module may make conducting output section
Point output high level, on the contrary it is low level；
The metal-oxide-semiconductor driving circuit for connecting aforementioned conducting output node is equipped in field-effect tube drive circuit module 4；Switch electricity
Road unit 5 includes the first MOS switch pipe Q1 and the second MOS switch pipe Q2 for connecting above-mentioned metal-oxide-semiconductor driving circuit；2nd MOS is opened
The drain electrode and source electrode for closing pipe Q2 are serially connected on load supplying circuit；
Output node output high level is connected in comparison circuit module may make metal-oxide-semiconductor driving circuit that the first MOS is driven to open
Close pipe conducting, the second MOS switch pipe shutdown, to disconnect load supplying circuit, the electricity that storage capacitor passes through output circuit module
Press signal output end electric discharge；Output node output low level is connected in comparison circuit module may make metal-oxide-semiconductor driving circuit to drive
First MOS switch pipe turns off, and the conducting of the second MOS switch pipe so that load supplying circuit is connected, while being filled for storage capacitor
Electricity.
Further, input circuit module includes the input protective unit for suppression common mode interference and surge, and input is anti-
It includes the safety being connected across respectively between power firestreak L and ground terminal PE and between zero-power line N and ground terminal PE to protect unit
Capacitance C1 and C2, the varistor R2 being connected between power firestreak L and zero curve N, and the fuse that is serially connected on power firestreak
F1 and varistor R11.
It is 100HZ by the AC-input voltage signal rectification of 50HZ that rectification circuit module, which uses existing rectifier bridge, rectifier bridge,
Half-wave voltage signal.
In comparison circuit module, five voltage-stabiliser tube D1, D2, D4, D5, D6 phases concatenate, and the anode of voltage-stabiliser tube is towards through whole
The anode of voltage signal after stream, cathode is towards current-limiting resistance R7.
Metal-oxide-semiconductor driving circuit includes the voltage-stabiliser tube D7 being connected on the grid and source electrode of the first metal-oxide-semiconductor and is connected to
Voltage-stabiliser tube D18 on the grid and source electrode of two MOS switch pipes；
The anode of voltage-stabiliser tube D7 connect the conducting output node of comparison circuit module with the grid of the first MOS switch pipe；Surely
The cathode of pressure pipe D7 connect the cathode in load supplying circuit with the source electrode of the first MOS switch pipe；
With the grid of the second MOS switch pipe after current-limiting resistance R4 and R9 in parallel, connection loads the anode of voltage-stabiliser tube D18
The anode of current supply circuit, the cathode in the cathode connection load supplying circuit of voltage-stabiliser tube D18, the source electrode of the second MOS switch pipe and leakage
Pole is serially connected in the anode circuit in load supplying circuit；Voltage-stabiliser tube D7 and D18 are used to protect the grid source electrode of field-effect tube Q1 and Q2
It is not breakdown；
And first the drain electrode of MOS switch pipe be connected with the grid of the second MOS switch pipe so that the first MOS switch pipe Q1 at
For a part for the driving circuit of the second MOS switch pipe Q2.
Metal-oxide-semiconductor driving circuit of the present invention further includes the filter circuit being made of resistance R5 and capacitance C4, and the both ends capacitance C4 are simultaneously
It is connected on the both ends voltage-stabiliser tube D18, resistance R5 is serially connected between voltage-stabiliser tube D18 and the grid of the second MOS switch pipe；Capacitance C4 simultaneously
The energy of middle storage is used for driving FET Q2.
In the source electrode and drain electrode of second MOS switch pipe and it is connected to switching tube protective unit, switching tube protective unit is by transient state
Inhibit diode D8 and D9 and resistance R12 to compose in series, can be used for protecting field-effect tube Q2.
The first MOS switch pipe and the second MOS switch pipe are all existing NMOS tube in the present invention, with switching speed
Soon, the characteristics of rated current is big, high pressure.
In use, the sum of voltage stabilizing value of all voltage-stabiliser tubes is that voltage compares threshold value in comparison circuit module, it is less than
The half-wave voltage signal that voltage compares threshold value will not lead to the conducting of the first MOS switch pipe, then the second MOS switch pipe is in and leads
Logical state, voltage export after the source-drain electrode of the second MOS switch pipe from output circuit module, while storage capacitor charges；Exchange
When input voltage compares threshold value higher than voltage, voltage-stabiliser tube will be breakdown, and conducting output node is high level, in driving circuit
Under effect, the conducting of the first MOS switch pipe, then the second MOS switch pipe shutdown, then former load supplying circuit is cut-off, turns by storing up
Energy capacitance electric discharge, electric energy is provided for subsequent conditioning circuit.
Embodiment
Embodiment as shown in Figure 1, when the voltage of input AC 50HZ, by exporting the half-wave for being 100HZ after D3 rectifications
Voltage.D1 is 47V voltage-stabiliser tubes, and D2, D4, D5, D6 are 82V voltage-stabiliser tubes, so it is 375V that voltage, which compares threshold,.R7 is 3W, 100K
The power resistor of ohm.When input ac voltage peak value is less than 375V, comparison circuit is 0V by the gate-source voltage of, Q1,
Q1 is turned off.D18 is the voltage-stabiliser tube of 16V, and R4, R9 resistance value are very big, so the voltage at the both ends C4 is 16V, i.e. the grid source electrode of Q2
Voltage is 16V, Q2 conductings.Input ac voltage to C15 capacitor chargings and provides energy for late-class circuit.Work as input ac voltage
When peak value is higher than 375V, for convenience, it is assumed that input ac voltage peak value is 400V, when 100HZ half-wave voltages rise to
When 375V or more, comparison circuit turn-on action, conducting output node is high level, and D7 is 16V voltage-stabiliser tubes, so the grid source electrode of Q1
It is connected for 16V, Q1, moment releases the voltage of C4, and the gate-source voltage of Q2 becomes 0V, Q2 shutdowns from 16V.C15 electricity this moment
Voltage in appearance is 375V, and Q2 hourglass source electrode maximum voltages are 25V.
When practical application, D1, D2, D4 can be adjusted according to system requirements, the voltage-stabiliser tube model of D5, D6 obtain different
Compare threshold.And the capacitance and pressure voltage of C15 are adjusted according to the peak value of successive load and input ac voltage, it is ensured that close in Q2
During disconnected, the energy stored on C15 is enough that successive load is kept to work normally, and will not be breakdown.
Claims (6)
1. a kind of circuit for realizing exchange input pressure limiting using on-off mode, characterized in that including input circuit module, rectified current
Road module, comparison circuit module, field-effect tube drive circuit module, on-off circuit module and output circuit module；
The input terminal input AC input voltage of the input circuit module exports after rectified circuit module rectification to more electric
Road module, and finally exported through output circuit module, form load supplying circuit；Output circuit module includes being connected to its voltage
Storage capacitor between signal output end；Field-effect tube drive circuit module and on-off circuit module are connected to comparison circuit module
On load supplying circuit between output end line module；
Comparison circuit module includes current-limiting resistance between being serially connected with its voltage signal inputs and 1 or more voltage-stabiliser tube；Current limliting
The node that resistance connects with multiple voltage-stabiliser tubes is conducting output node；The sum of voltage stabilizing value of all voltage-stabiliser tubes is that voltage compares threshold
Value；The voltage signal for comparing threshold value higher than voltage for being input to comparison circuit module may make the high electricity of conducting output node output
It is flat, on the contrary it is low level；
The metal-oxide-semiconductor driving circuit for connecting aforementioned conducting output node is equipped in field-effect tube drive circuit module；Switching circuit list
Member includes connecting the first MOS switch pipe and the second MOS switch pipe of above-mentioned metal-oxide-semiconductor driving circuit；The drain electrode of second MOS switch pipe
It is serially connected on load supplying circuit with source electrode；
Output node output high level is connected in comparison circuit module may make metal-oxide-semiconductor driving circuit to drive the first MOS switch pipe
Conducting, the shutdown of the second MOS switch pipe, to disconnect load supplying circuit, storage capacitor is believed by the voltage of output circuit module
The electric discharge of number output end；Output node output low level is connected in comparison circuit module may make metal-oxide-semiconductor driving circuit to drive first
MOS switch pipe turns off, and the conducting of the second MOS switch pipe so that load supplying circuit is connected, while being charged for storage capacitor；
The metal-oxide-semiconductor driving circuit includes the voltage-stabiliser tube (D7) being connected on the grid and source electrode of the first metal-oxide-semiconductor and is connected to
Voltage-stabiliser tube (D18) on the grid and source electrode of second MOS switch pipe；
The cathode of voltage-stabiliser tube (D7) connect the conducting output node of comparison circuit module with the grid of the first MOS switch pipe；Voltage stabilizing
The anode of pipe (D7) connect the cathode in load supplying circuit with the source electrode of the first MOS switch pipe；
The anode of voltage-stabiliser tube (D18) connect the anode in load supplying circuit, voltage-stabiliser tube (D18) with the grid of the second MOS switch pipe
Cathode connection load supplying circuit cathode, the source electrode and drain electrode of the second MOS switch pipe is serially connected in the negative of load supplying circuit
Polar curve road；
And first the drain electrode of MOS switch pipe be connected with the grid of the second MOS switch pipe；
Metal-oxide-semiconductor driving circuit further includes the filter circuit being made of resistance (R5) and capacitance (C4), and the both ends capacitance (C4) are attempted by
On the both ends voltage-stabiliser tube (D18), resistance (R5) is serially connected between voltage-stabiliser tube (D18) and the grid of the 2nd MOS switching tubes；Electricity simultaneously
Hold the energy stored in C4 and is used for driving FET Q2；Voltage-stabiliser tube (D18) anode is through current-limiting resistance connection load supplying circuit
Anode；
It is gone back between conducting input node and the drain electrode of the second MOS switch pipe and is connected to resistance R1 and resistance R3.
2. the circuit according to claim 1 for realizing exchange input pressure limiting using on-off mode, characterized in that input circuit
Module includes input protective unit, and the input protective unit includes being connected across respectively between power firestreak and ground terminal and electric
Safety capacitance between source zero curve and ground terminal, the varistor being connected between power firestreak and zero curve, and it is serially connected in power supply
Fuse on firewire and varistor.
3. the circuit according to claim 1 for realizing exchange input pressure limiting using on-off mode, characterized in that the rectification
Circuit module includes rectifier bridge, and the AC-input voltage signal rectification of 50HZ is the half-wave voltage signal of 100HZ by rectifier bridge.
4. the circuit according to claim 1 for realizing exchange input pressure limiting using on-off mode, characterized in that comparison circuit
In module, five voltage-stabiliser tubes mutually concatenate, and the anode of voltage-stabiliser tube is towards the anode of the voltage signal after rectified, and cathode is towards limit
Leakage resistance.
5. the circuit according to claim 1 for realizing exchange input pressure limiting using on-off mode, characterized in that the 2nd MOS
Switching tube protective unit is gone back and is connected in the source electrode and drain electrode of switching tube, and switching tube protective unit is by Transient Suppression Diode and electricity
Resistance composes in series.
6. the circuit according to any one of claims 1 to 5 for realizing exchange input pressure limiting using on-off mode, feature
It is that the first MOS switch pipe and the second MOS switch pipe are all NMOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610299474.XA CN105827105B (en) | 2016-05-09 | 2016-05-09 | A kind of circuit for realizing exchange input pressure limiting using on-off mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610299474.XA CN105827105B (en) | 2016-05-09 | 2016-05-09 | A kind of circuit for realizing exchange input pressure limiting using on-off mode |
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| Publication Number | Publication Date |
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| CN105827105A CN105827105A (en) | 2016-08-03 |
| CN105827105B true CN105827105B (en) | 2018-09-11 |
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| CN106100388B (en) * | 2016-08-19 | 2019-05-03 | 深圳市华星光电技术有限公司 | A kind of power circuit |
| CN108039697A (en) * | 2017-12-30 | 2018-05-15 | 深圳市松朗科技有限公司 | Overload protecting circuit |
| CN113067485A (en) * | 2020-01-02 | 2021-07-02 | 青岛鼎信通讯股份有限公司 | High-efficiency micropower power supply circuit scheme with 220VAC power supply |
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| CN103457232A (en) * | 2012-05-29 | 2013-12-18 | 海洋王照明科技股份有限公司 | Short-circuit protection circuit of direct-current load and illuminator |
| CN203674978U (en) * | 2013-11-06 | 2014-06-25 | 艾默生电气公司 | Direct-current voltage-limiting circuit, electronic equipment therewith, and temperature controller |
| CN203840228U (en) * | 2014-05-21 | 2014-09-17 | 天津市双源津瑞科技有限公司 | Miniwatt power supply AC amplitude-limiting protection circuit module for electric power instrument |
| CN205792224U (en) * | 2016-05-09 | 2016-12-07 | 南京南瑞继保电气有限公司 | A kind of circuit utilizing on-off mode to realize exchange input pressure limiting |
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| CN105827105A (en) | 2016-08-03 |
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