CN105449642A - Protection method and circuit of Boost circuit - Google Patents
Protection method and circuit of Boost circuit Download PDFInfo
- Publication number
- CN105449642A CN105449642A CN201511027746.2A CN201511027746A CN105449642A CN 105449642 A CN105449642 A CN 105449642A CN 201511027746 A CN201511027746 A CN 201511027746A CN 105449642 A CN105449642 A CN 105449642A
- Authority
- CN
- China
- Prior art keywords
- circuit
- input
- boost
- output
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a protection method and circuit of a Boost circuit. The protection circuit comprises a Boost circuit 1, a switch circuit 2, an input voltage port, an output voltage port and a pulse width modulation (PWM) driving signal, wherein the switch circuit 2 is connected in series onto a main power loop of the Boost circuit 1; when the protection circuit is normally working, the switch circuit 2 is in a conduction state all the time and is equivalent to a wire; when abnormal states such as input overvoltage, input undervoltage, output overcurrent and output short-circuit occurs in the Boost circuit, the PWM driving signal is stopped outputting, the switch circuit 2 is automatically cut off after being delayed for a period, and the whole circuit is protected; and when abnormality in the Boost circuit disappears, the switch circuit 2 can enter the conduction state all the time again without affecting the normal working of the whole circuit. By controlling the on/off of the switch circuit 2, the protection function of the Boost circuit is achieved; and the control circuit is simple, the cost is low, and the power density and the reliability are high.
Description
Technical field
The present invention relates to Boost circuit, the particularly input overvoltage of Boost, input undervoltage, output overcurrent, output short-circuit protection method and circuit.
Background technology
Along with the progress of power electronic technology; Switching Power Supply is constantly to high power density, high efficiency, high reliability development; the defencive function of Switching Power Supply has become an important indicator of reliability; Boost circuit is as the most basic a kind of topology of Switching Power Supply; can be applicable in non-isolated product, power density and efficiency can be done very high.But Boost circuit is when realizing the protections such as input overvoltage, input undervoltage, output overcurrent, output short-circuit, and circuit exists inherent shortcoming.Fig. 1 is basic Boost circuit, and when the unusual condition of Boost circuit appearance input overvoltage, input undervoltage, output overcurrent, output short-circuit, after master control IC detects abnormal signal, turned off by PWM drive singal, main switch TR1 will disconnect.But due to the existence of diode D1, under above-mentioned unusual condition, input voltage directly outputs to output by diode D1, and now output voltage approximates input voltage, cannot turn off completely.Fig. 2 is the Boost circuit substituting diode D1 with metal-oxide-semiconductor TR0, although this circuit is by turning off two metal-oxide-semiconductors TR0, TR1 simultaneously, realizes defencive function.But when normally working, need the turn-on and turn-off controlling two MOS, and sequential needs accurately to control, make control become complicated, cost raises, and reliability and power density reduce simultaneously.Therefore existing Boost circuit realizes defencive function and mainly there is following shortcoming:
(1) adopt a metal-oxide-semiconductor and a diode as the switching tube of Boost circuit, the defencive functions such as input overvoltage, input undervoltage, output overcurrent, output short-circuit cannot be realized.
(2) adopt two metal-oxide-semiconductors as the switching tube of Boost circuit, control circuit is complicated, and cost is high simultaneously, reliability and power density low.
Summary of the invention
Have in view of that; one of the technical problem to be solved in the present invention is: overcoming Boost circuit in prior art cannot under low cost, high power density, high reliability condition; realize the defect of the defencive functions such as input overvoltage, input undervoltage, output overcurrent, output short-circuit; a kind of guard method of Boost circuit is provided; the guard method of described Boost circuit both can realize low cost, high power density, high reliability, can realize again the defencive functions such as input overvoltage, input undervoltage, output overcurrent, output short-circuit.
Corresponding therewith, two of the technical problem to be solved in the present invention is: the protective circuit providing a kind of Boost circuit.
The present invention is for one of solving the problems of the technologies described above, and the technical scheme provided is:
The guard method of Boost circuit a: switching circuit of connecting on the main loop of power circuit of Boost, described switching circuit is for controlling the output of described Boost circuit; When described Boost circuit normally works, described switching circuit is in conducting state always, is equivalent to a wire, does not affect the normal work of whole circuit; When there is the abnormalities such as input overvoltage, input undervoltage, output overcurrent, output short-circuit when described Boost circuit, automatically shut down after described switching circuit postpones a period of time, described Boost main power circuit will be cut off, and realize the protection to described Boost circuit; When after the abnormal disappearance of described Boost circuit, described switching circuit can enter conducting state always again, does not affect the normal work of whole circuit.
More preferably, described switching circuit turn on and off the PWM drive singal being controlled by described Boost circuit main switch.
More preferably, described switching circuit has the storage effect of short time to described PWM drive singal.
More preferably, the time of described storage effect can set.
The present invention for solve the problems of the technologies described above two, the technical scheme provided is:
A kind of protective circuit of Boost circuit: comprise Boost circuit, switching circuit; Described switching circuit in series on the main loop of power circuit of described Boost circuit, the output of the Boost circuit described in control; When described Boost circuit normally works, described switching circuit is in conducting state always, is equivalent to a wire, does not affect the normal work of whole circuit; When there is the abnormalities such as input overvoltage, input undervoltage, output overcurrent, output short-circuit when described Boost circuit, automatically shut down after described switching circuit postpones a period of time, described Boost main power circuit will be cut off, and realize the protection to described Boost circuit; When after the abnormal disappearance of described Boost circuit, described switching circuit can enter conducting state always again, does not affect the normal work of whole circuit.
More preferably, described switching circuit turn on and off the PWM drive singal being controlled by described Boost circuit main switch.
More preferably, described switching circuit has the storage effect of short time to described PWM drive singal.
More preferably, the time of described storage effect can set.
Preferably, described Boost circuit comprises: the first inductance, the first diode, the first electric capacity, the first main switch, inputs positive port Vin, and input, with reference to ground GND, output plus terminal mouth+Vo, exports negative terminal mouth-Vo; Described switching circuit comprises the second diode, the second electric capacity, second switch pipe, the first resistance; The positive port Vin of input described in one end of the first described inductance connects, the anode of the first diode described in the other end of the first described inductance connects be connected described in the drain electrode of the first main switch; The input described in source electrode connection of the first described main switch is with reference to ground GND; The one end of the first electric capacity described in the negative electrode of the first described diode connects be connected described in output plus terminal mouth+Vo; The output negative terminal mouth-Vo described in other end connection of the first described electric capacity; The output negative terminal mouth-Vo described in drain electrode connection of described second switch pipe, the input described in source electrode connection of described second switch pipe is with reference to ground GND; The grid of the first described main switch connects PWM drive singal and the anode of the second diode described in being connected; The grid of the second switch pipe described in negative electrode connection of the second described diode; The grid of the second switch pipe described in the connection of one end of the first described resistance, the input described in other end connection of the first described resistance is with reference to ground GND; The grid of the second switch pipe described in the connection of one end of the second described electric capacity, the input described in other end connection of the second described electric capacity is with reference to ground GND.
Preferably, the second described capacitor equivalent is the parasitic capacitance between the grid of described second switch pipe and source electrode.
Preferably, described Boost circuit comprises: the first inductance, the first diode, the first electric capacity, the first main switch, inputs positive port Vin, and input, with reference to ground GND, output plus terminal mouth+Vo, exports negative terminal mouth-Vo; Described switching circuit comprises the second diode, the second electric capacity, second switch pipe, the first resistance; The positive port Vin of input described in one end of the first described inductance connects, the anode of the first diode described in the other end of the first described inductance connects be connected described in the drain electrode of the first main switch; The output negative terminal mouth-Vo described in source electrode connection of the first described main switch; The one end of the first electric capacity described in the negative electrode of the first described diode connects be connected described in output plus terminal mouth+Vo; The output negative terminal mouth-Vo described in other end connection of the first described electric capacity; The output negative terminal mouth-Vo described in drain electrode connection of described second switch pipe, the input described in source electrode connection of described second switch pipe is with reference to ground GND; The grid of the first described main switch connects PWM drive singal and the anode of the second diode described in being connected; The grid of the second switch pipe described in negative electrode connection of the second described diode; The grid of the second switch pipe described in the connection of one end of the first described resistance, the input described in other end connection of the first described resistance is with reference to ground GND; The grid of the second switch pipe described in the connection of one end of the second described electric capacity, the input described in other end connection of the second described electric capacity is with reference to ground GND.
Preferably, the second described capacitor equivalent is the parasitic capacitance between the grid of described second switch pipe and source electrode.
Operation principle of the present invention will labor in embodiment part, is not repeated herein.
Compared with prior art, the present invention has following outstanding advantage:
(1), when there is the unusual conditions such as input overvoltage, input undervoltage, output overcurrent, output short-circuit in Boost circuit, can realize protecting fast, reliably.
(2) while the protection such as input overvoltage, input undervoltage, output overcurrent, output short-circuit realizing Boost circuit, without the need to the control circuit additionally increased, can realize that whole control circui is simple, cost is low, power density and reliability high.
Accompanying drawing explanation
Fig. 1 is the general principle figure of existing Boost circuit diode rectification scheme;
Fig. 2 is the general principle figure of existing Boost circuit metal-oxide-semiconductor rectification scheme;
Fig. 3 is theory diagram of the present invention;
Fig. 4 is the circuit diagram of the embodiment of the present invention one;
Fig. 5 is the circuit diagram of the embodiment of the present invention two;
Oscillogram when Fig. 6 is the embodiment of the present invention one, embodiment two circuit normally works;
Oscillogram when Fig. 7 is the embodiment of the present invention one, the abnormal conditions such as output overcurrent, output short-circuit appear in embodiment two circuit.
Embodiment
The design of the technology of the present invention is; Boost main power circuit to be connected a switching circuit; described switching circuit turn on and off the PWM drive singal being controlled by Boost circuit main switch; when master control IC detects that the unusual conditions such as input overvoltage, input undervoltage, output overcurrent, output short-circuit appear in Boost circuit; PWM drive singal stops exporting; switching circuit automatically shuts down after postponing a period of time; whole circuit will be completely cut-off, thus play a protective role to circuit abnormality state.While the protection such as input overvoltage, input undervoltage, output overcurrent, output short-circuit realizing Boost circuit, without the need to the control circuit additionally increased, can realize that whole control circui is simple, cost is low, power density and reliability high.
Technical scheme for a better understanding of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in more detail.
Further illustrate below in conjunction with specific implementation circuit.
Embodiment one
Fig. 4 is the circuit diagram of the embodiment of the present invention one, and it comprises: Boost circuit 1, switching circuit 2.Switching circuit 1 is connected on the main loop of power circuit of Boost circuit 2; Boost circuit 1 comprises the first inductance L 1, first diode D1, and the first electric capacity C1, the first main switch TR1, input positive port Vin, and input, with reference to ground GND, output plus terminal mouth+Vo, exports negative terminal mouth-Vo, PWM drive singal; Switching circuit 2 comprises the second diode D2, the second electric capacity C2, second switch pipe TR2, the first resistance R1; One end of first inductance L 1 connects the positive port Vin of input, and the other end of the first inductance L 1 connects the anode of the first diode D1 and the drain electrode being connected the first main switch TR1; The source electrode of the first main switch TR1 connects input with reference to ground GND; One end that the negative electrode of the first diode D1 connects the first electric capacity C1 be connected output plus terminal mouth+Vo; The other end of the first electric capacity C1 connects output negative terminal mouth-Vo; The drain electrode of second switch pipe TR2 connects output negative terminal mouth-Vo, and the source electrode of second switch pipe TR2 connects input with reference to ground GND; The grid of the first main switch TR1 connects PWM drive singal and the anode being connected the second diode D2; The negative electrode of the second diode D2 connects the grid of second switch pipe TR2; One end of first resistance R1 connects the grid of second switch pipe TR2, and the other end of the first resistance R1 connects input with reference to ground GND; One end of second electric capacity C2 connects the grid of second switch pipe TR2, and the other end of the second electric capacity C2 connects input with reference to ground GND; Second electric capacity C2 also can be equivalent to the parasitic capacitance between the grid of second switch pipe TR2 and source electrode.
Its operation principle is as follows:
Normal work, when PWM drive singal exports high level, simultaneously by two switch transistor T R1, TR2 drives conducting, when PWM drive singal output low level, the drive level of main switch TR1 will be dragged down immediately, complete normal switch motion, switch transistor T R2 is due to the unilateal conduction effect of diode D2, its drive level cannot directly be dragged down, resistance R1 slow release can only be passed through, the time (storage effects namely described in claims) of electric discharge is determined by electric capacity C2 and resistance R1, when this discharge time is set as multiple switch periods, because each cycle electric capacity C2 can be full of again by PWM drive singal, the voltage of final electric capacity C2 will maintain on a high level, switch transistor T R2 will be in conducting state always, be equivalent to a wire, therefore the switching circuit added almost has no effect to normal operating conditions.During normal work, switch transistor T R2 does not have switching loss and drives loss, withstand voltage is also very low, and available metal-oxide-semiconductor conducting internal resistance is very little, almost can equal the internal resistance of wire, generally can choose the very little metal-oxide-semiconductor of volume, affect the power density of whole product hardly.
When there is the unusual conditions such as input overvoltage, input undervoltage, output overcurrent, output short-circuit at product; stopping is exported PWM drive singal to control IC or the interval a very long time exports one section of pwm signal; so main switch TR1 will quit work immediately; and the electric capacity C2 between switch transistor T R2 grid and source electrode is discharged by resistance R1; after postponing several switch periods, switch transistor T R2 also will turn off completely; whole circuit turns off completely, plays the protective effect of unusual condition.All defencive functions that this protection scheme to Boost circuit can copy completely and Synchronization Control IC has.
After abnormality disappears, PWM drive singal normally exports, and product can recover normal operating state immediately.
Embodiment two
Fig. 5 is the circuit diagram of the embodiment of the present invention two, and it comprises: Boost circuit 1, switching circuit 2.Switching circuit 1 is connected on the main loop of power circuit of Boost circuit 2; Boost circuit 1 comprises the first inductance L 1, first diode D1, and the first electric capacity C1, the first main switch TR1, input positive port Vin, and input, with reference to ground GND, output plus terminal mouth+Vo, exports negative terminal mouth-Vo, PWM drive singal; Switching circuit 2 comprises the second diode D2, the second electric capacity C2, second switch pipe TR2, the first resistance R1; One end of first inductance L 1 connects the positive port Vin of input, and the other end of the first inductance L 1 connects the anode of the first diode D1 and the drain electrode being connected the first main switch TR1; The source electrode of the first main switch TR1 connects output negative terminal mouth-Vo; One end that the negative electrode of the first diode D1 connects the first electric capacity C1 be connected output plus terminal mouth+Vo; The other end of the first electric capacity C1 connects output negative terminal mouth-Vo; The drain electrode of second switch pipe TR2 connects output negative terminal mouth-Vo, and the source electrode of second switch pipe TR2 connects input with reference to ground GND; The grid of the first main switch TR1 connects PWM drive singal and the anode being connected the second diode D2; The negative electrode of the second diode D2 connects the grid of second switch pipe TR2; One end of first resistance R1 connects the grid of second switch pipe TR2, and the other end of the first resistance R1 connects input with reference to ground GND; One end of second electric capacity C2 connects the grid of second switch pipe TR2, and the other end of the second electric capacity C2 connects input with reference to ground GND; Second electric capacity C2 also can be equivalent to the parasitic capacitance between the grid of second switch pipe TR2 and source electrode.
Its operation principle and embodiment one just the same, do not repeat them here.
Embodiments of the present invention are not limited thereto; according to foregoing of the present invention; utilize ordinary technical knowledge and the customary means of this area; do not departing under the present invention's above-mentioned basic fundamental thought prerequisite; the present invention can also make the amendment of other various ways, replacement or change, all drops within rights protection scope of the present invention.
Claims (12)
1. a guard method for Boost circuit, a switching circuit that the main loop of power circuit of Boost is connected, described switching circuit is for controlling the output of described Boost circuit; When described Boost circuit normally works, described switching circuit is in conducting state always, is equivalent to a wire, does not affect the normal work of whole circuit; When there is the abnormalities such as input overvoltage, input undervoltage, output overcurrent, output short-circuit when described Boost circuit, automatically shut down after described switching circuit postpones a period of time, described Boost main power circuit will be cut off, and realize the protection to described Boost circuit; When after the abnormal disappearance of described Boost circuit, described switching circuit can enter conducting state always again, does not affect the normal work of whole circuit.
2. method according to claim 1, is characterized in that: described switching circuit turn on and off the PWM drive singal being controlled by described Boost circuit main switch.
3. method according to claim 2, is characterized in that: described switching circuit has the storage effect of short time to described PWM drive singal.
4. method according to claim 3, is characterized in that: the time of described storage effect can set.
5. a protective circuit for Boost circuit, comprises Boost circuit, switching circuit; Described switching circuit in series on the main loop of power circuit of described Boost circuit, the output of the Boost circuit described in control; When described Boost circuit normally works, described switching circuit is in conducting state always, is equivalent to a wire, does not affect the normal work of whole circuit; When there is the abnormalities such as input overvoltage, input undervoltage, output overcurrent, output short-circuit when described Boost circuit, automatically shut down after described switching circuit postpones a period of time, described Boost main power circuit will be cut off, and realize the protection to described Boost circuit; When after the abnormal disappearance of described Boost circuit, described switching circuit can enter conducting state always again, does not affect the normal work of whole circuit.
6. circuit according to claim 5, is characterized in that: described switching circuit turn on and off the PWM drive singal being controlled by described Boost circuit main switch.
7. circuit according to claim 6, is characterized in that: described switching circuit has the storage effect of short time to described PWM drive singal.
8. circuit according to claim 7, is characterized in that: the time of described storage effect can set.
9. circuit according to claim 5, is characterized in that: described Boost circuit comprises: the first inductance, the first diode, the first electric capacity, the first main switch, inputs positive port Vin, and input, with reference to ground GND, output plus terminal mouth+Vo, exports negative terminal mouth-Vo; Described switching circuit comprises the second diode, the second electric capacity, second switch pipe, the first resistance; The positive port Vin of input described in one end of the first described inductance connects, the anode of the first diode described in the other end of the first described inductance connects be connected described in the drain electrode of the first main switch; The input described in source electrode connection of the first described main switch is with reference to ground GND; The one end of the first electric capacity described in the negative electrode of the first described diode connects be connected described in output plus terminal mouth+Vo; The output negative terminal mouth-Vo described in other end connection of the first described electric capacity; The output negative terminal mouth-Vo described in drain electrode connection of described second switch pipe, the input described in source electrode connection of described second switch pipe is with reference to ground GND; The grid of the first described main switch connects PWM drive singal and the anode of the second diode described in being connected; The grid of the second switch pipe described in negative electrode connection of the second described diode; The grid of the second switch pipe described in the connection of one end of the first described resistance, the input described in other end connection of the first described resistance is with reference to ground GND; The grid of the second switch pipe described in the connection of one end of the second described electric capacity, the input described in other end connection of the second described electric capacity is with reference to ground GND.
10. circuit according to claim 9, is characterized in that: the second described capacitor equivalent is the parasitic capacitance between the grid of described second switch pipe and source electrode.
11. circuit according to claim 5, is characterized in that: described Boost circuit comprises: the first inductance, the first diode, the first electric capacity, the first main switch, input positive port Vin, and input, with reference to ground GND, output plus terminal mouth+Vo, exports negative terminal mouth-Vo; Described switching circuit comprises the second diode, the second electric capacity, second switch pipe, the first resistance; The positive port Vin of input described in one end of the first described inductance connects, the anode of the first diode described in the other end of the first described inductance connects be connected described in the drain electrode of the first main switch; The output negative terminal mouth-Vo described in source electrode connection of the first described main switch; The one end of the first electric capacity described in the negative electrode of the first described diode connects be connected described in output plus terminal mouth+Vo; The output negative terminal mouth-Vo described in other end connection of the first described electric capacity; The output negative terminal mouth-Vo described in drain electrode connection of described second switch pipe, the input described in source electrode connection of described second switch pipe is with reference to ground GND; The grid of the first described main switch connects PWM drive singal and the anode of the second diode described in being connected; The grid of the second switch pipe described in negative electrode connection of the second described diode; The grid of the second switch pipe described in the connection of one end of the first described resistance, the input described in other end connection of the first described resistance is with reference to ground GND; The grid of the second switch pipe described in the connection of one end of the second described electric capacity, the input described in other end connection of the second described electric capacity is with reference to ground GND.
12. circuit according to claim 11, is characterized in that: the second described capacitor equivalent is the parasitic capacitance between the grid of described second switch pipe and source electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511027746.2A CN105449642B (en) | 2015-12-30 | 2015-12-30 | A kind of guard method of Boost circuit and circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511027746.2A CN105449642B (en) | 2015-12-30 | 2015-12-30 | A kind of guard method of Boost circuit and circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105449642A true CN105449642A (en) | 2016-03-30 |
| CN105449642B CN105449642B (en) | 2017-11-07 |
Family
ID=55559560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511027746.2A Active CN105449642B (en) | 2015-12-30 | 2015-12-30 | A kind of guard method of Boost circuit and circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105449642B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105977919A (en) * | 2016-06-17 | 2016-09-28 | 山东超越数控电子有限公司 | Design method for short-circuit protection |
| CN107658853A (en) * | 2017-09-12 | 2018-02-02 | 嘉善中正新能源科技有限公司 | BOOST coordinates the current foldback circuit of PUSH PULL cascade circuits |
| CN109390917A (en) * | 2018-12-19 | 2019-02-26 | 北京天诚同创电气有限公司 | Control method, device and the DCDC power protecting circuit of DCDC power supply |
| CN113178846A (en) * | 2021-06-15 | 2021-07-27 | 阳光电源股份有限公司 | Boost converter and boost system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090244942A1 (en) * | 2008-03-26 | 2009-10-01 | Ming-Ho Huang | Synchronous rectification control circuit |
| CN102013802A (en) * | 2010-12-17 | 2011-04-13 | 上海小糸车灯有限公司 | BOOST circuit with short circuit protection function |
| CN102612209A (en) * | 2012-01-20 | 2012-07-25 | 中国科学院上海技术物理研究所 | Recoverable protective circuit of boosting LED (light emitting diode) driving power supply and design method of recoverable protective circuit |
| CN203180783U (en) * | 2013-04-12 | 2013-09-04 | 深圳市海洋王照明工程有限公司 | Boosted circuit |
| CN203368003U (en) * | 2013-07-01 | 2013-12-25 | 深圳Tcl新技术有限公司 | Dual protection device for Boost circuit |
| CN103606884A (en) * | 2013-11-25 | 2014-02-26 | 深圳市华星光电技术有限公司 | Over-current protection circuit, LED backlight drive circuit and liquid crystal display |
| CN203690895U (en) * | 2014-01-10 | 2014-07-02 | 深圳市垅运照明电器有限公司 | DC-DC boost short circuit protection circuit |
-
2015
- 2015-12-30 CN CN201511027746.2A patent/CN105449642B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090244942A1 (en) * | 2008-03-26 | 2009-10-01 | Ming-Ho Huang | Synchronous rectification control circuit |
| CN102013802A (en) * | 2010-12-17 | 2011-04-13 | 上海小糸车灯有限公司 | BOOST circuit with short circuit protection function |
| CN102612209A (en) * | 2012-01-20 | 2012-07-25 | 中国科学院上海技术物理研究所 | Recoverable protective circuit of boosting LED (light emitting diode) driving power supply and design method of recoverable protective circuit |
| CN203180783U (en) * | 2013-04-12 | 2013-09-04 | 深圳市海洋王照明工程有限公司 | Boosted circuit |
| CN203368003U (en) * | 2013-07-01 | 2013-12-25 | 深圳Tcl新技术有限公司 | Dual protection device for Boost circuit |
| CN103606884A (en) * | 2013-11-25 | 2014-02-26 | 深圳市华星光电技术有限公司 | Over-current protection circuit, LED backlight drive circuit and liquid crystal display |
| CN203690895U (en) * | 2014-01-10 | 2014-07-02 | 深圳市垅运照明电器有限公司 | DC-DC boost short circuit protection circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105977919A (en) * | 2016-06-17 | 2016-09-28 | 山东超越数控电子有限公司 | Design method for short-circuit protection |
| CN107658853A (en) * | 2017-09-12 | 2018-02-02 | 嘉善中正新能源科技有限公司 | BOOST coordinates the current foldback circuit of PUSH PULL cascade circuits |
| CN107658853B (en) * | 2017-09-12 | 2019-03-15 | 嘉善中正新能源科技有限公司 | The current foldback circuit of BOOST cooperation PUSH-PULL cascade circuit |
| CN109390917A (en) * | 2018-12-19 | 2019-02-26 | 北京天诚同创电气有限公司 | Control method, device and the DCDC power protecting circuit of DCDC power supply |
| CN113178846A (en) * | 2021-06-15 | 2021-07-27 | 阳光电源股份有限公司 | Boost converter and boost system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105449642B (en) | 2017-11-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106026621B (en) | A kind of band avoids the IGBT drive circuit and detection method of short-circuit protection blind area | |
| CN205248774U (en) | Reverse -connection protective circuit is prevented in input | |
| CN105449642A (en) | Protection method and circuit of Boost circuit | |
| CN102904217B (en) | Diode-clamped three-level insulated gate bipolar translator (IGBT) drive protection circuit, diode-clamped three-level (IGBT) drive module, and diode-clamped three-level topology device | |
| CN105634260B (en) | Output short circuit protection circuit | |
| CN103633820A (en) | IGBT (insulated gate bipolar transistor) parallel current sharing circuit | |
| CN205829455U (en) | The IGBT drive circuit of short-circuit protection blind area avoided by a kind of band | |
| CN210405079U (en) | Protection circuit and power input module | |
| CN105281296A (en) | Switch power supply protection and control method and circuit | |
| CN105429106A (en) | Output short circuit protection method of switch power supply and circuit | |
| CN101170278B (en) | A bridge soft shutdown circuit | |
| CN202309502U (en) | Switching power supply circuit capable of absorbing inverse voltage peak | |
| CN215934520U (en) | Power supply switching system and dual-power supply equipment | |
| CN108880230B (en) | Power sources in parallel control module and parallel system based on Switching Power Supply chopping voltage | |
| CN115882580A (en) | Power supply switching system and dual-power supply equipment | |
| CN202333786U (en) | Drive circuit for restraining IGBT (Insulated Gate Bipolar Transistor) overcurrent | |
| CN203800576U (en) | Protection circuit of overcurrent and under current for MOS transistor output | |
| CN203326555U (en) | Power supply overvoltage protection circuit of electronic product port | |
| CN205304240U (en) | Control circuit is prevented joining conversely by high -power direct current | |
| CN104393571A (en) | IGBT module over-current protection system | |
| CN208571903U (en) | A kind of chip breaking circuit and the Switching Power Supply comprising the circuit | |
| CN203086324U (en) | MOSFET driving and protecting circuit of miniwatt pulse transformer | |
| CN202231609U (en) | Current-limiting device and electric system | |
| CN205335824U (en) | Protection circuit of boost circuit | |
| CN204131482U (en) | A kind of IGBT drives protection system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |