CN2604808Y - Overcurrent and short-circuit protector for ringing current generator - Google Patents
Overcurrent and short-circuit protector for ringing current generator Download PDFInfo
- Publication number
- CN2604808Y CN2604808Y CN 03202543 CN03202543U CN2604808Y CN 2604808 Y CN2604808 Y CN 2604808Y CN 03202543 CN03202543 CN 03202543 CN 03202543 U CN03202543 U CN 03202543U CN 2604808 Y CN2604808 Y CN 2604808Y
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- Prior art keywords
- diode
- resistance
- triode
- output
- overcurrent
- Prior art date
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- Expired - Fee Related
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- Control Of Eletrric Generators (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
An over current and short circuit protector of ringing generator comprises a combined electronic switch, an over current inspection apparatus, an over current inspection delayer, and a bootstrapping auxiliary power supply. In usage the combined electronic switch is sequence connected into the output loop of the ringing generator, and the series branch which forms the bootstrapping auxiliary power supply is cross connected to the output port of the ringing generator. The combined electronic switch closes when no over current and short-circuit occur, which ensures the output of the output ac signal of the ringing generator. While the combined electronic switch swiftly opens when current and short-circuit occur, which cuts off the ringing generator from the output loop and avoids the connection of the ringing generator and the output loop in time of over current and short-circuit. Thus interrupted output, so called ''hiccup'' output, is formed, which ensures the safety of the ringing generator. Compared with the present technology, the ringing generator has the advantages that the overall protection of the ringing generator is ensured and the safety and security are higher because a secondary switch-tube of the ringing generator is also protected.
Description
Technical field
The utility model relates to a kind of protective device of ringing current generator, particularly a kind of ringing current generator overcurrent and short-circuit protector.
Background technology
In the prior art; ringing current generator all connects when reality is used--the 48V DC power supply; so that all need to be provided with overcurrent and short-circuit protection usually; the safety of protection ringing current generator when overcurrent and short circuit; and existing ringing current generator overcurrent and short-circuit protection are when overcurrent and short circuit occurring; just the pulsewidth to ringing current generator main circuit control impuls is limited; promptly a PWM to ringing current generator controls; this protection only can be protected the elementary main power tube of ringing current generator; because the loop still is communicated with and-existence of 48V DC power supply; there is big electric current in the loop; the danger that exists not shielded ringing current generator secondary switch pipe to be burnt, the safety of ringing current generator can not get ensureing completely.
Summary of the invention
Technical problem to be solved in the utility model is the deficiency that overcomes existing ringing current generator overcurrent and short-circuit protection technical measures; and provide a kind of when overcurrent and short circuit occurring can with ringing current generator by output loop in the device of excision, full-scope safeguards ringing current generator safety, i.e. ringing current generator overcurrent and short-circuit protector.
The technical scheme in the invention for solving the technical problem is: this when overcurrent and short circuit occurring can with ringing current generator by output loop in the excision, full-scope safeguards ringing current generator safety device; be ringing current generator overcurrent and short-circuit protector; it comprises combination electronic switch 2, overcurrent detecting device 3 and overcurrent protection delayer 4 and bootstrapping accessory power supply 1 four parts, and bootstrapping accessory power supply 1 is by rectifier diode D
1, resistance R
1, capacitance C
1Series arm constitutes; Overcurrent detecting device 3 is by the overcurrent resistance R
8, NPN type triode V
3And base resistance R
7, photoelectrical coupler N
1And elementary input current-limiting resistance R
9Constitute; Combination electronic switch 2 is by diode D
2, diode D
3, diode D
4, diode D
5With field effect transistor Q
1And grid bias pressure resistance (R
2, R
6) constitute diode D
2Negative electrode and diode D
4The input of the sub-switch of anode phase continuous cropping combined electrical, diode D
3Negative electrode and diode D
5The output of the sub-switch of anode phase continuous cropping combined electrical, diode D
4With diode D
5Negative electrode and field effect transistor Q
1Drain electrode link to each other field effect transistor Q
1Source electrode by the overcurrent resistance R
8With diode D
2With diode D
3Anode link to each other field effect transistor Q
1Grid by its bias pressure resistance (R
2, R
6) and bootstrapping accessory power supply resistance R
1Connect rectifier diode D
1One end of negative electrode links to each other; Overcurrent protection delayer 4 is by positive-negative-positive triode V
1And base stage high potential biasing resistor R
3, NPN type triode V
2And base stage bias pressure resistance (R
4, R
5), controllable silicon V
5, photoelectrical coupler N
2, voltage comparator N
3, diode D
6, diode D
7, diode D
8, resistance R
11, resistance R
13, resistance R
14, resistance R
15, resistance R
12And capacitor C
5The integrator that constitutes constitutes, triode V
1Emitter, triode V
1Base stage by its high potential biasing resistor R
3With field effect transistor Q
1Grid link to each other triode V
2With triode V
3Parallel connection, triode V
2Base stage by its bias pressure resistance (R
4, R
5) and triode V
1Collector electrode link to each other triode V
2With triode V
3Collector electrode and triode V
1Base stage link to each other triode V
3Base stage by its base resistance R
7With the overcurrent resistance R
8Connect field effect transistor Q
1One end of source electrode links to each other, emitter and overcurrent resistance R
8The other end link to each other resistance R
13, controllable silicon V
5, resistance R
11, photoelectrical coupler N
2Elementary being in series meet power supply V
DD, controllable silicon V
5Anode and control end respectively with photoelectrical coupler N
1Secondary input, output link to each other photoelectrical coupler N
1Elementary by its input current-limiting resistance R
9Be connected across diode D
4With diode D
5Negative electrode and diode D
2With diode D
3Anode between, photoelectrical coupler N
2Secondary also with triode V
3Be in parallel voltage comparator N
3In-phase input end pass through resistance R
14Connect reference voltage V
REF, inverting input passes through resistance R
12And capacitor C
5The integrator connecting resistance R that constitutes
11Connect controllable silicon V
5One end of negative electrode, voltage comparator N
3In-phase input end and its output between cross-over connection diode D
8, inverting input and its output span connecting resistance R
15With diode D
7Series arm, controllable silicon V
5Control end and voltage comparator N
3Output between cross-over connection diode D
6Such ringing current generator overcurrent and short-circuit protection are serially connected in the output loop of ringing current generator by the input of combination electronic switch, the combination electronic switch 2 that output will constitute, and will constitute the rectifier diode D of bootstrapping accessory power supply 1
1, resistance R
1, capacitance C
1Series arm is connected across the output port of ringing current generator, and when overcurrent and short circuit not occurring, the AC signal of ringing current generator output is by being connected across the rectifier diode D of ringing current generator output port
1, resistance R
1, capacitance C
1Branch road is in resistance R
1Bootstrap voltage mode of last formation is through resistance R
2And resistance R
6Offer field effect transistor Q after the dividing potential drop
1Grid, make field effect transistor Q
1Conducting, combination electronic switch 2 closures are at the positive half cycle of ringing current generator output AC signal, for AC signal output provides by diode D
4→ field effect transistor Q
1→ overcurrent resistance R
8→ diode D
3Such output channel, and at the negative half period of ringing current generator output AC signal, for AC signal output provides by diode D
5→ field effect transistor Q
1→ overcurrent resistance R
8→ diode D
2Such output channel guarantees the output of ringing current generator output AC signal; When overcurrent and short circuit occurring, the overcurrent resistance R
8On pressure drop increase → triode V
3Base potential rising → triode V
3Conducting → triode V
1Base potential reduces, thereby makes triode V
1Conducting is rapidly with field effect transistor Q
1Grid potential drags down, field effect transistor Q
1End, combination electronic switch 2 is opened, and the ringing current generator output channel is cut off, and is about to ringing current generator by excising in the output loop, avoid connecting in the output loop-the 48V DC power supply is poured in down a chimney and ringing current generator is caused damage, and field effect transistor Q
1End, make up electronic switch 2 and open, make the overcurrent resistance R on the one hand again
8On pressure drop reduce rapidly → triode V
3Base potential reduces rapidly → triode V
3By → triode V
2Conducting after a little while, continuity triode V
1Base stage electronegative potential, triode V
1Conducting and field effect transistor Q
1By and with the ringing current generator output channel cut off, with ringing current generator by the state that excises in the output loop.Also make simultaneously diode D on the other hand
4With diode D
5Negative electrode and diode D
2With diode D
3Anode between pressure drop increase → make by input current-limiting resistance R
9Be connected across diode D
4With diode D
5Negative electrode and diode D
2With diode D
3Anode between photoelectrical coupler N
1Conducting → power supply V
DDBy photoelectrical coupler N
1Be controllable silicon V
5The control end controllable silicon V that powers → make
5Conducting is at triode V
2Before ending, make photoelectrical coupler N
2Conducting is with triode V
1Base stage electronegative potential, triode V
1Conducting and field effect transistor Q
1The state that ends locks, and keeps the dissengaged positions of ringing current generator output channel, avoids in overcurrent and the duration of short circuit, and ringing current generator is connected with its output loop, the safety of protection ringing current generator.And controllable silicon V
5After the conducting, power supply V
DDAlso promptly pass through resistance R
13, R
12Give capacitor C
5Charging, after certain time-delay, voltage comparator N
3Inverting input voltage＞its in-phase input end voltage, voltage comparator N
3Output overturn, output electronegative potential, by diode D
6Be about to controllable silicon V
5The control end current potential drags down (simultaneously by diode D
8Also with voltage comparator N
3The in-phase input end current potential drag down, by current-limiting resistance R
15, diode D
7Also with voltage comparator N
3The inverting input current potential drag down) → make controllable silicon V
5By → photoelectrical coupler N
2End, will be to triode V
1Base stage electronegative potential, triode V
1Conducting and field effect transistor Q
1The latch-release of cut-off state, triode V
1Base potential rising → triode V
1By → field effect transistor Q
1Grid potential rising → field effect transistor Q
1Conducting, combination electronic switch 2 closures, the recovery ringing current generator is connected with its output loop, ringing current generator promptly recovers output, detect output loops as overcurrent detecting device after this 3 and still be in overcurrent or short-circuit condition, promptly repeat above-mentioned action, remove, recover operate as normal automatically until overcurrent or short-circuit condition.
This ringing current generator overcurrent provided by the utility model and short-circuit protector, when overcurrent and short circuit not occurring, the combination electronic switch closes can guarantee the output of ringing current generator output AC signal; And when overcurrent and short circuit occurring; the combination electronic switch can be opened rapidly again; with ringing current generator by excising in the output loop; and avoid being connected of ringing current generator and its output loop in overcurrent and the duration of short circuit, with intermittently output, be commonly called as the working method that " having the hiccups " exports; the safety of protection ringing current generator; compared with prior art: the secondary switch pipe of ringing current generator has also obtained protection, has the advantage of general protection ringing current generator safety, and security reliability is higher.
Description of drawings
Fig. 1 is the electrical schematic diagram of ringing current generator overcurrent provided by the utility model and short-circuit protector.
The ringing current generator overcurrent that Fig. 2 is provided for the utility model embodiment and the circuit diagram of short-circuit protector.
Embodiment
With reference to accompanying drawing; the utility model embodiment is provided this when overcurrent and short circuit occurring can with ringing current generator by output loop in the device of excision, full-scope safeguards ringing current generator safety; be ringing current generator overcurrent and short-circuit protector; it comprises combination electronic switch 2, overcurrent detecting device 3 and overcurrent protection delayer 4 and bootstrapping accessory power supply 1 four parts, and bootstrapping accessory power supply 1 is by the rectifier diode D that is connected across ringing current generator 5 output ports
1, resistance R
1, capacitance C
1Series arm constitutes; Overcurrent detecting device 3 is by the overcurrent resistance R
8, NPN type triode V
3And base resistance R
7With its base stage anti-interference filtration capacitor C
4, photoelectrical coupler N
1And elementary input current-limiting resistance R
9Constitute; Combination electronic switch 2 is by diode D
2, diode D
3, diode D
4, diode D
5, field effect transistor Q
1And grid bias pressure resistance (R
2, R
6) and with its grid bias pressure resistance R
6Voltage stabilizing didoe D in parallel
9And grid anti-interference filtration capacitor C
3Constitute diode D
2Negative electrode and diode D
4The input of the sub-switch of anode phase continuous cropping combined electrical, diode D
3Negative electrode and diode D
5The output of the sub-switch of anode phase continuous cropping combined electrical, diode D
4With diode D
5Negative electrode and field effect transistor Q
1Drain electrode link to each other field effect transistor Q
1Source electrode by the overcurrent resistance R
8With diode D
2With diode D
3Anode link to each other field effect transistor Q
1Grid by its bias pressure resistance (R
2, R
6) and bootstrapping accessory power supply resistance R
1Connect rectifier diode D
1One end of negative electrode links to each other; Overcurrent protection delayer 4 is by positive-negative-positive triode V
1And base stage high potential biasing resistor R
3, NPN type triode V
2And base stage bias pressure resistance (R
4, R
5), controllable silicon V
5And control end electronegative potential biasing resistor R
10With its control end anti-interference filtration capacitor C
6, photoelectrical coupler N
2, voltage comparator N
3, diode D
6, diode D
7, diode D
8, resistance R
11, resistance R
13, resistance R
14, resistance R
15, resistance R
12And capacitor C
5The integrator that constitutes constitutes, triode V
1Emitter, triode V
1Base stage by its high potential biasing resistor R
3With field effect transistor Q
1Grid link to each other triode V
2With triode V
3Parallel connection, triode V
2Base stage by its bias pressure resistance (R
4, R
5) and triode V
1Collector electrode link to each other triode V
2With triode V
3Collector electrode and triode V
1Base stage link to each other triode V
3Base stage by its base resistance R
7With the overcurrent resistance R
8Connect field effect transistor Q
1One end of source electrode links to each other, emitter and overcurrent resistance R
8The other end link to each other resistance R
13, controllable silicon V
5, resistance R
11, photoelectrical coupler N
2Elementary being in series meet power supply V
DD, controllable silicon V
5Anode and control end respectively with photoelectrical coupler N
1Secondary input, output link to each other photoelectrical coupler N
1Elementary by its input current-limiting resistance R
9Be connected across diode D
4With diode D
5Negative electrode and diode D
2With diode D
3Anode between, photoelectrical coupler N
2Secondary and triode V
3Be in parallel voltage comparator N
3In-phase input end pass through resistance R
14Connect reference voltage V
REF, inverting input passes through resistance R
12And capacitor C
5The integrator connecting resistance R that constitutes
11Connect controllable silicon V
5One end of negative electrode, voltage comparator N
3In-phase input end and its output between cross-over connection diode D
8, inverting input and its output span connecting resistance R
15With diode D
7Series arm, controllable silicon V
5Control end and voltage comparator N
3Output between cross-over connection diode D
6
Such ringing current generator overcurrent and short-circuit protection are serially connected in the output loop of ringing current generator by the input of combination electronic switch, the combination electronic switch 2 that output will constitute.In addition, when reducing to make up electronic switch closes, diode D
2, diode D
3, diode D
4, diode D
5, field effect transistor Q
1, the overcurrent resistance R
8Pressure drop is to the influence of load effect, and also cross-over connection has capacitor C between the input of making up electronic switch, output
2, and the ringing current generator that disposes and connect and compose, combination electronics switch series connection branch road parallel resistor R
16
Among the figure, 5-ringing current generator, 6--48V DC power supply.
Claims (5)
1, a kind of ringing current generator overcurrent and short-circuit protector; it is characterized in that: it comprises combination electronic switch (2), overcurrent detecting device (3) and overcurrent protection delayer (4) and bootstrapping accessory power supply (1) four part, and bootstrapping accessory power supply (1) is by rectifier diode (D
1), resistance (R
1), capacitance (C
1) the series arm formation; Overcurrent detecting device (3) is by crossing leakage resistance (R
8), NPN type triode (V
3) and base resistance (R
7), photoelectrical coupler (N
1) and elementary input current-limiting resistance (R
9) constitute; Combination electronic switch (2) is by diode (D
2), diode (D
3), diode (D
4), diode (D
5) and field effect transistor (Q
1) and grid bias pressure resistance (R
2, R
6) constitute diode (D
2) negative electrode and diode (D
4) the input of the sub-switch of anode phase continuous cropping combined electrical, diode (D
3) negative electrode and diode (D
5) the output of the sub-switch of anode phase continuous cropping combined electrical, diode (D
4) and diode (D
5) negative electrode and field effect transistor (Q
1) drain electrode link to each other field effect transistor (Q
1) source electrode passed through leakage resistance (R
8) and diode (D
2) and diode (D
3) anode link to each other field effect transistor (Q
1) grid by its bias pressure resistance (R
2, R
6) and bootstrapping accessory power supply resistance (R
1) connection rectifier diode (D
1) end of negative electrode links to each other; Overcurrent protection delayer (4) is by positive-negative-positive triode (V
1) and base stage high potential biasing resistor (R
3), NPN type triode (V
2) and base stage bias pressure resistance (R
4, R
5), controllable silicon (V
5), photoelectrical coupler (N
2), voltage comparator (N
3), diode (D
6), diode (D
7), diode (D
8), resistance (R
11), resistance (R
13), resistance (R
14), resistance (R
15), resistance (R
12) and electric capacity (C
5) integrator that constitutes constitutes triode (V
1) emitter, triode (V
1) base stage by its high potential biasing resistor (R
3) and field effect transistor (Q
1) grid link to each other triode (V
2) and triode (V
3) parallel connection, triode (V
2) base stage by its bias pressure resistance (R
4, R
5) and triode (V
1) collector electrode link to each other triode (V
2) and triode (V
3) collector electrode and triode (V
1) base stage link to each other triode (V
3) base stage by its base resistance (R
7) and cross leakage resistance (R
8) connection field effect transistor (Q
1) end of source electrode links to each other, emitter and mistake leakage resistance (R
8) the other end link to each other resistance (R
13), controllable silicon (V
5), resistance (R
11), photoelectrical coupler (N
2) elementary being in series meet power supply (V
DD), controllable silicon (V
5) anode and control end respectively with photoelectrical coupler (N
1) secondary input, output link to each other photoelectrical coupler (N
1) elementary by its input current-limiting resistance (R
9) be connected across diode (D
4) and diode (D
5) negative electrode and diode (D
2) and diode (D
3) anode between, photoelectrical coupler (N
2) secondary also with triode (V
3) be in parallel voltage comparator (N
3) in-phase input end by resistance (R
14) meet reference voltage (V
REF), inverting input is by resistance (R
12) and electric capacity (C
5) the integrator connecting resistance (R that constitutes
11) connection controllable silicon (V
5) end of negative electrode, voltage comparator (N
3) in-phase input end and its output between cross-over connection diode (D
8), inverting input and its output span connecting resistance (R
15) and diode (D
7) series arm, controllable silicon (V
5) control end and voltage comparator (N
3) output between cross-over connection diode (D
6).
2, ringing current generator overcurrent according to claim 1 and short-circuit protector is characterized in that: its field effect transistor (Q
1) grid bias pressure resistance (R
6) be parallel with voltage stabilizing didoe (D
9) and anti-interference filtration electric capacity (C
3).
3, ringing current generator overcurrent according to claim 1 and 2 and short-circuit protector is characterized in that: its triode (V
3) base stage also be connected with anti-interference filtration electric capacity (C
4), controllable silicon (V
5) control end also be connected with electronegative potential biasing resistor (R
10) and anti-interference filtration electric capacity (C
6).
4, ringing current generator overcurrent according to claim 1 and 2 and short-circuit protector is characterized in that: also cross-over connection has electric capacity (C between the input, output of its combination electronic switch
2), and the ringing current generator that disposes and connect and compose, combination electronics switch series connection branch road parallel resistor (R
16).
5, the overcurrent of ringing current generator according to claim 3 and short-circuit protector is characterized in that: also cross-over connection has electric capacity (C between the input, output of its combination electronic switch
2), and the ringing current generator that disposes and connect and compose, combination electronics switch series connection branch road parallel resistor (R
16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03202543 CN2604808Y (en) | 2003-01-24 | 2003-01-24 | Overcurrent and short-circuit protector for ringing current generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03202543 CN2604808Y (en) | 2003-01-24 | 2003-01-24 | Overcurrent and short-circuit protector for ringing current generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2604808Y true CN2604808Y (en) | 2004-02-25 |
Family
ID=34157860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03202543 Expired - Fee Related CN2604808Y (en) | 2003-01-24 | 2003-01-24 | Overcurrent and short-circuit protector for ringing current generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2604808Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101262536B (en) * | 2007-03-07 | 2012-01-25 | 北京佳讯飞鸿电气股份有限公司 | A realization method and device for ring current and magnetic ring signal |
| CN104917403A (en) * | 2015-05-25 | 2015-09-16 | 张家港市华为电子有限公司 | Automatic switching circuit in power supply applicable to 220V and 110V power grids |
-
2003
- 2003-01-24 CN CN 03202543 patent/CN2604808Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101262536B (en) * | 2007-03-07 | 2012-01-25 | 北京佳讯飞鸿电气股份有限公司 | A realization method and device for ring current and magnetic ring signal |
| CN104917403A (en) * | 2015-05-25 | 2015-09-16 | 张家港市华为电子有限公司 | Automatic switching circuit in power supply applicable to 220V and 110V power grids |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |