CN1459903A - Huge flush out current, short circuit and overload protection three in one circuit - Google Patents
Huge flush out current, short circuit and overload protection three in one circuit Download PDFInfo
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- CN1459903A CN1459903A CN 02120415 CN02120415A CN1459903A CN 1459903 A CN1459903 A CN 1459903A CN 02120415 CN02120415 CN 02120415 CN 02120415 A CN02120415 A CN 02120415A CN 1459903 A CN1459903 A CN 1459903A
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- 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
- H02H7/122—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 for inverters, i.e. dc/ac converters
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Abstract
A 3-in-1 circuit for the protection of huge surge current, short circuit and overload features that the secondary winding of transformer in power supply is used as the secondary power supply for providing current to said protecting circuit when output circuit is shorted, a current detector installed at said secondary winding is used to detect the generation of overload current, and a timer is used to set up the time when the rated huge surge current can be generated to restrict its generation.
Description
Technical field
The present invention relates to a kind of power protecting circuit, particularly a kind of huge flush out current, short circuit and the three-in-one circuit of overload protection.
Background technology
In general, power supply unit has its specified power output, output voltage and output current.In these specified working ranges, power supply unit all can operate as normal.Outside specified working range, must design the protective circuit of some protection power supply unit circuit.For example, when large-scale electromagnetic contactor moved, power supply unit need provide huge flush out current (Out-rush Current), the big several times of this current ratio overload current (Overload Current) (about 1.5`3 times or higher); More many times than rated current is big (about 7 times or higher).So, when power supply unit designs, generally all can take into account the protection of this huge flush out current and overload.
Figure 1 shows that the huge flush out current of known technology and the block diagram of the two-in-one circuit of overload protection.It utilizes the variation in voltage characteristic of the attached coil of transformer 103 to come design circuit.Protective circuit has comprised several sections: actuator 107, determining device 108, the first voltage potential generator 111, the second voltage potential generator 104, T2 timer 110, T3 timer 105 and the maintenance system that the starts defencive function actuator 109 that quits work.Other part, the main element of power supply unit as AC power 101, rectifier 102, transformer 103 with 106 of pulse-width modulation (PWM) control system are.
Wherein, the actuator 107 that starts defencive function is used for impelling PWM control system 106 quit work (shutdown).And determining device 108 is responsible for judging whether to carry out the action of huge flush out current (outrushcurrent) and overload protection.110 of T2 timers are used for limiting the time of huge flush out current (outrush current) and overload current output.As long as timer is not finished timing, just can not notify the actuator 107 that starts defencive function, system can not enter guard mode yet.111 of the first voltage potential generators provide voltage potential to the actuator 107 that starts defencive function, make its comparator that includes (U1A) that individual relatively current potential be arranged.Maintenance system 109 of the actuators that quit work impel the actuator 107 that starts defencive function to continue to keep the state that quits work of PWM control system 106.105 restriction PWM 106 out-of-work times of control system of T3 timer.104 of the second voltage potential generators provide voltage potential to the maintenance system actuator 109 that quits work, and make its comparator that includes that a relatively current potential be arranged.
The operating principle of entire circuit is described as follows:
When output current (output current) continued to become big, the output voltage of the attached coil of transformer 103 also became greatly, and this information can pass to determining device 108 and judge whether to start protective circuit.Will start T2 timers 110 by the actuator 107 that starts defencive function if carry out, when timing is finished after and output current during still greater than overload current, the actuator 107 of startup defencive function promptly impels PWM control system 106 to quit work.Starting the maintenance system actuator 109 that quits work simultaneously impels the actuator 107 that starts defencive function to continue to keep the state that quits work of PWM control system 106, two actuators phenomenon (interlocking) of helping each other.Start the maintenance system and quit work behind the actuator 109, T3 timer 105 picks up counting, and timing period P WM control system 106 still keeps quitting work.After timing is finished, the defencive function cancellation, PWM control system 106 attempts starting whole system once more.If output current is during still greater than overload current, then output voltage, electric current can present with square wave.
Above-mentioned protective circuit is main design starting point with huge flush out current and overload protection, therefore, there is no the function of output short circuit protection.Therefore, in case during output short-circuit, its short circuit current is very big and continue output, the excessive element of pressure drop will flow through because of huge short circuit current and produce a large amount of heat and destroy element indirectly.So,, be necessary it is incorporated in the middle of the protective circuit for short-circuit protection.
Summary of the invention
In view of this, the technical problem to be solved in the present invention provides a kind of huge flush out current, short circuit and overload protection three in one circuit, can protect not reason output short circuit of power supply unit, produce huge flush out current or overload and damage.
For reaching above-mentioned purpose; huge flush out current provided by the present invention, short circuit and overload protection three in one circuit; apply to one and have in the power supply unit of a transformer and a pulse-width modulation (PWM) control system, comprise: second source, current detector, voltage potential generator, timer and start the actuator of defencive function.Wherein, second source, current detector all are connected with the secondary side of transformer with the voltage potential generator.And timer is to be used for the output current of received current detector, as the output current T that picks up counting during greater than overload current, and then produces an overload protection control signal in the T time.The actuator that starts defencive function then is connected with timer with PWM control system, second source, voltage potential generator respectively.
Timer produces the in addition timing of huge flush out current when output at power supply unit, and the timing of the big timer of output current shortens, and works as the T ' time then, sends a silence signal to the PWM control system.When the output short circuit of power supply unit, the voltage output potential descends, and the actuator that starts defencive function also can be sent silence signal to the PWM control system.In addition, when the actuator that starts defencive function was obtained above-mentioned overload protection control signal, the actuator that starts defencive function also can be sent silence signal to the PWM control system.
Wherein, second source is power supply after the actuator that starts defencive function is sent silence signal, and when its depleted of energy, the PWM control system is promptly started working.
In addition; the invention provides another kind of huge flush out current, short circuit and overload protection three in one circuit, comprise: second source, current detector, the first voltage potential generator, signal amplifier, noise filter, first timer, the actuator, the second voltage potential generator, the maintenance system that start defencive function the quit work actuator and second timer.Wherein, second source, current detector all are connected with the secondary side of transformer with the voltage potential generator.And timer is to be used for receiving by current detector reaching the output current that signal amplifier reaches noise filter again, as the output current T that picks up counting during greater than overload current, and then produces an overload protection control signal in the T time.The actuator that starts defencive function then is connected with timer with PWM control system, second source, voltage potential generator respectively.
Timer produces the in addition timing of huge flush out current when output at power supply unit, works as the T ' time then, sends a silence signal to the PWM control system.When the output short circuit of power supply unit, the voltage output potential descends, and the actuator that starts defencive function also can be sent silence signal to the PWM control system.In addition, when the actuator that starts defencive function was obtained above-mentioned overload protection control signal, the actuator that starts defencive function also can be sent silence signal to the PWM control system.
The maintenance system actuator that quits work then is connected with PWM control system, the actuator and the second voltage potential generator that start defencive function; when receive start defencive function actuator transmitted when quitting work instruction, be responsible for continuing to keep quitting work of pulse-width modulation control system.Second timer then is connected with the actuator that starts defencive function and the maintenance system actuator that quits work, and picks up counting when the actuator that starts defencive function is sent silence signal.When timing then, the maintenance system actuator that quits work sends promptly that working signal is to this pulse-width modulation control system at the beginning, it is promptly started working.
In addition, second source has comprised rectification circuit and capacitance-resistance (RC) discharge circuit.Timer then can be capacitance-resistance (RC) charging circuit.Current detector can be a resistance.
For further understanding feature of the present invention and advantage, existing conjunction with figs. and most preferred embodiment are described in detail as follows.
Description of drawings
Fig. 1 is the huge flush out current and the overload protecting circuit block diagram of known technology;
Fig. 2 is that huge flush out current of the present invention, short circuit and overload protection three in one circuit first are concrete
Embodiment;
Fig. 3 is the short-circuit protection sequential chart of the embodiment of the invention;
Fig. 4 is the overload protection sequential chart of the embodiment of the invention;
Fig. 5 is the huge flush out current protection sequential chart of the embodiment of the invention; And
Fig. 6 is that huge flush out current of the present invention, short circuit and overload protection three in one circuit second are concrete
Embodiment.
Embodiment
Protective circuit of the present invention is to utilize the resulting current signal of a current detector (can use resistance), judges whether to carry out overload protection.Just can impel system to stop output after protective circuit can postpone a period of time when overload, so the section time can allow huge current flow output.After system stops output, because protective circuit can direct into the power supply of the PWM control IC in the middle of the power supply unit earth terminal of primary side; Or trigger the function that quits work of PWM control IC, making it can't regular event, so system still stops output.After after a while, just allow system to start once more.If system is in overload situations always, Shu Chu voltage will present with square wave so.
When output short-circuit, protective circuit still has short-circuit protection function, because the power supply of protective circuit is to be provided by another group circuit, even because of short circuit allows the output voltage vanishing, protective circuit still can regular event.Short circuit or when overload protective circuit operating principle be identical, can postpone a period of time during short circuit equally just to make system stop output, this time has huge short circuit current and produces, though the very big time is of short duration, and shorter than the time of delay of overload.So the average loss power during short circuit is very little.
According to above-mentioned notion, the invention provides two specific embodiments and realize three in one circuit of the present invention, below will introduce respectively.
Figure 2 shows that first specific embodiment of huge flush out current of the present invention, short circuit and overload protection three in one circuit.Protective circuit has comprised several sections: second source 205, the actuator 206 that starts defencive function, current detector 207, voltage potential generator 208 and T2 timer 209.Other part, the main element of power supply unit as AC power 201, rectifier 202, transformer 203 with 204 of PWM control system are.
Wherein, the second source 205 of protection circuit is provided by transformer 203.This second source 205 offers two functional modules and uses, and promptly starts the actuator 206 and voltage potential generator 208 (the dotted line arrow represents that second source 205 also can not provide power supply to voltage potential generator 208 among the figure) of defencive function.Even under the short-circuit condition, transformer 203 still has energy to shift, though its value is very little, has enough allowed the protective circuit regular event.
The concrete running of the embodiment of Fig. 2 needs to cooperate Fig. 3, Fig. 4 and sequential chart shown in Figure 5 to be illustrated.
Fig. 3 cooperates Fig. 2 to illustrate for the sequential chart when output short-circuit simultaneously.When output short-circuit, output voltage is zero, impels voltage potential generator 208 to obtain current potential near no-voltage.Because before voltage potential decline impelled the T2 timer to finish timing, the actuator 206 that starts defencive function just began action, this is the time of T4.So the T4 time that is enabled in of short-circuit protection then promptly begins, its time is less than T2.When the energy shortage of the second source 205 that actuator 206 operating voltages that start defencive function are provided; also be; the T3 time, then the actuator 206 that starts defencive function promptly can loss of function and make the defencive function cancellation, and PWM control system 204 can attempt starting whole system once more then.This action is removed up to short-circuit state always repeatedly, and till the output normally.
The situation of overload then please refer to Fig. 4 and cooperates Fig. 2 to illustrate.When output current during greater than overload current, the output that is connected to the current detector 207 of transformer 203 outputs can impel T2 timer 209 to pick up counting.After 209 timing of T2 timer are finished and output current during still greater than overload current, the actuator 206 that starts defencive function can impel PWM control system 204 to quit work and keep the state of quitting work.When the energy shortage of the second source 205 that actuator 206 operating voltages that start defencive function are provided; also be; T3 ' the time, then the actuator 206 that starts defencive function promptly can loss of function and make the defencive function cancellation, and PWM control system 204 can attempt starting whole system once more then.If output current is during still greater than overload current, then output voltage, electric current can present with square wave.This action is removed up to overload conditions always repeatedly, and till the output normally.
Fig. 5 has then illustrated the protective circuit action when huge flush out current takes place.When huge flush out current produced, the output that is connected to the current detector 207 of transformer 203 outputs can impel T2 timer 209 to pick up counting.Simultaneously, in T2 timer 209, designed charger, so, charger under the charging of huge flush out current, time T 2 ' then, the actuator 206 that starts defencive function promptly begins action, and PWM control system 204 is quit work.Therefore, when the huge flush out current protection takes place, the T2 time of its maximum output time T2 ' during less than overload protection.And when the energy shortage of the second source 205 that actuator 206 operating voltages that start defencive function are provided, also, T3 " time, then the actuator 206 that starts defencive function promptly can loss of function and make the defencive function cancellation.Then, PWM control system 204 can attempt starting whole system once more.This action is removed up to the huge flush out current situation always repeatedly, and till the output normally.
It should be noted that T2 ≠ T2 ', T4＜T2; T3, T3 ' and T3 " by the decision of the energy of second source 205, thus when three kinds of protections take place respectively, T3, T3 ' and T3 " and unequal.And T2 timer 314 is a RC charging circuit; Charging interval weak point when output current is big, on the contrary the charging interval is long.
Figure 6 shows that second specific embodiment of huge flush out current of the present invention, short circuit and overload protection three in one circuit.Protective circuit has comprised several sections: second source 305, the actuator 306, the maintenance system that start defencive function quit work actuator 308, current detector 310, the first voltage potential generator 313, the second voltage potential generator 307, T2 timer 314, T3 timer 309, signal amplifier 311 and noise filter 312.Other part, the main element of power supply unit as AC power 301, rectifier 302, transformer 303 with 304 of PWM control system are.
The second source 305 of protection circuit is provided by transformer 303, and this second source 305 is supplied to three functional modules to use, and is respectively the actuator 306, the signal amplifier 311 and noise filter 312 that start defencive function.Even under short-circuit condition, transformer still has energy to shift, though the very little protective circuit regular event that enough allowed.
Figure 6 shows that the concrete running of second embodiment, need to cooperate Fig. 3, Fig. 4 and sequential chart shown in Figure 5 to be illustrated.
Please refer to Fig. 3 and cooperate Fig. 6, it has illustrated the protection when short circuit takes place.Output voltage is zero when output short-circuit, impels the first voltage potential generator 313 to obtain near zero voltage potential.Because voltage potential descends, so before T2 timer 314 was finished timing, also, the T4 time, then the actuator 306 that starts defencive function just began action.So T4 is less than T2.When the actuator 306 beginning execute protection actions that start defencive function are provided, also start the T3 timer simultaneously.When the T3 time then, the maintenance system quits work actuator 308 promptly can loss of function and cancel the state that quits work of PWM control system 304, PWM control system 304 can attempt starting whole system once more then.This action is removed up to short-circuit state always repeatedly, and till the output normally.
Please refer to Fig. 4 and cooperate Fig. 6, it has illustrated the protection that overload takes place.Because the signal that current detector 310 detects is very little,, therefore use noise filter 312 filtered noises so when current detector 310 detects current signal, through signal amplifier 311 signal is amplified earlier, but noise also is exaggerated.When output current during greater than overload current, noise filter 312 can impel T2 timer 314 to pick up counting.After timing is finished and output current during still greater than overload current, the actuator 306 that starts defencive function impels PWM control system 304 to quit work.Starting the maintenance system actuator 308 that quits work simultaneously impels PWM control system 304 to continue to keep quitting work.When having started the maintenance system actuator 308 that quits work, T3 timer 309 also picks up counting, and timing period P WM control system 304 still keeps quitting work.After the timing T3 ' of T3 timer 309 finishes, the defencive function cancellation, PWM control system 304 attempts starting whole system once more.If output current is during still greater than overload current, then output voltage, electric current can present with square wave.This action is removed up to overload conditions always repeatedly, and till the output normally.
Please refer to Fig. 5 and cooperate Fig. 6, it has illustrated the protection when huge flush out current takes place.When huge flush out current produced, the output of current detector 207 that is connected to transformer 203 outputs impelled T2 timer 209 to pick up counting through after signal amplifier 311 and noise filter 312 effects.Simultaneously, in T2 timer 209, designed charger.So, charger under the charging of huge flush out current, time T 2 ' then, the actuator 306 that starts defencive function promptly begins action, and PWM control system 304 is quit work.Starting the maintenance system actuator 308 that quits work simultaneously impels PWM control system 304 to continue to keep quitting work.Because the hysteresis function of noise filter 312 makes that its maximum output time T2 ' was identical with T2 when the huge flush out current protection took place.When having started the maintenance system actuator 308 that quits work, T3 timer 309 also picks up counting, and timing period P WM control system 304 still keeps quitting work.And when time of T3 timer then, also, T3 " time, then the maintenance system quits work actuator 308 promptly can loss of function and make the function cancellation that quits work.Then, PWM control system 304 can attempt starting whole system once more.This action is removed up to the huge flush out current situation always repeatedly, and till the output normally.
Second embodiment has antimierophonic function compared to first embodiment.Wherein, T2=T2 ', T4＜T2; T3, T3 ' and T3 " by T3 timer decision, so when three kinds of protections take place respectively, T3=T3 '=T3 ".And T2 timer 314 is a RC charging circuit, and the T3 timer is a RC discharge circuit.
First specific embodiment of the present invention has following characteristics:
1, the working power of protection circuit; be not subjected to any improper operating influence: by Circuit Fault on Secondary Transformer go out pin directly with rectification circuit independently in addition rectification (being different from main output rectification circuit) obtain second source; even under the short-circuit condition; transformer still has energy to shift, though the very little protective circuit regular event that enough allowed.
2, voltage ratio is than current potential: for obtaining accurate overload protection current potential, so independently voltage potential must be arranged.
3, the output time (T2 timer) of restriction huge flush out current and overload current: the maximum time of utilizing RC charging circuit (T2 timer) restriction huge flush out current and overload current output.
When 4, protective effect takes place, the out-of-work time of restriction system: utilize RC discharge circuit (being second source), limit the out-of-work time of PWM control system.
5, the average loss power during short-circuit protection is very little: because output voltage is almost nil during output short-circuit, independently voltage ratio is also almost nil than current potential, thus the time of restriction huge current flow output also shorten, so average loss power is very little.
Second specific embodiment then has following characteristics:
1, the working power of protection circuit; be not subjected to any improper operating influence: by Circuit Fault on Secondary Transformer go out pin directly with rectification circuit independently in addition rectification (being different from main output rectification circuit) can obtain second source; even under short-circuit condition; transformer still has energy to shift, though the very little protective circuit regular event that enough allowed.
2, have extremely excellent noise resisting ability: the current detector of power supply changeover device replaces with resistance usually, so current signal has sizable noise, gets final product filtering noise by hysteresis circuitry.
3, independently voltage ratio than current potential: for obtaining accurate overload protection current potential, so independently voltage potential must be arranged.
4, the output time (T2 timer) of restriction huge flush out current and overload current: the maximum time of utilizing RC charging circuit (T2 timer) restriction huge flush out current and overload current output.
When 5, protective effect takes place, the out-of-work time of restriction system (T3 timer): utilize RC discharge circuit (T3 timer) the restriction PWM out-of-work time of control system.
6, the average loss power during short-circuit protection is very little: because output voltage is almost nil during output short-circuit, independently voltage ratio is also almost nil than current potential, thus the time of restriction huge current flow output also shorten, so average loss power is very little.
Though the present invention with aforesaid preferred embodiment openly as above; right its is not in order to limiting the present invention, anyly has the knack of correlation technique person, without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore scope of patent protection of the present invention is when being as the criterion with claims.
Claims (11)
1, a kind of huge flush out current, short circuit and overload protection three in one circuit apply to one and have in the power supply unit of a transformer and a pulse-width modulation control system, it is characterized in that comprising:
One second source is connected to the secondary side of this transformer;
One current detector is connected to the secondary side of this transformer;
One voltage potential generator is connected to the secondary side of this transformer, in order to export the voltage output potential of this transformer;
One timer in order to receiving the output current of this current detector, and produces an overload protection control signal when timing is finished; And
One starts the actuator of defencive function, is connected with this pulse-width modulation control system, this second source, this voltage potential generator and this timer respectively, to the T ' time, sends a silence signal to this pulse-width modulation control system in timing; When the output short circuit of this power supply unit, this voltage output potential produces pressure drop, and the actuator of this startup defencive function is promptly sent a silence signal to this pulse-width modulation control system; When the actuator of this startup defencive function was obtained this overload protection control signal, the actuator of this startup defencive function was promptly sent a silence signal to this pulse-width modulation control system;
Wherein, when this second source was sent this silence signal in the actuator of this startup defencive function, this started the power supply of the actuator of defencive function as supply, and when the depleted of energy of this second source, this pulse-width modulation control system is promptly started working.
2, huge flush out current as claimed in claim 1, short circuit and overload protection three in one circuit is characterized in that this second source comprises a rectification circuit.
3, huge flush out current as claimed in claim 1, short circuit and overload protection three in one circuit is characterized in that this second source comprises a capacitance-resistance (RC) discharge circuit.
4, huge flush out current as claimed in claim 1, short circuit and overload protection three in one circuit is characterized in that this timer is a capacitance-resistance (RC) charging circuit.
5, huge flush out current as claimed in claim 1, short circuit and overload protection three in one circuit is characterized in that this current detector is a resistance.
6, huge flush out current as claimed in claim 1, short circuit and overload protection three in one circuit; it is characterized in that between this current detector and this timer; also be connected with a signal amplifier and a noise filter; this signal amplifier is in order to being amplified this weak voltage that this current detector detected, and this noise filter is in order to the noise filtering in the middle of this weak voltage.
7, a kind of huge flush out current, short circuit and overload protection three in one circuit apply to one and have in the power supply unit of a transformer and a pulse-width modulation control system, it is characterized in that comprising:
One second source is connected to the secondary side of this transformer;
One current detector is connected to the secondary side of this transformer;
One first voltage potential generator is connected to the secondary side of this transformer, in order to export the voltage output potential of this transformer;
One signal amplifier is connected with this second source with this current detector, is also amplified in order to the output current that receives this current detector;
One noise filter is connected with this signal amplifier and this second source, in order to receive this output current and its noise of filtering through amplifying;
One first timer, in order to receive this noise filter this through amplifying and output current of filtering noise, and when timing is finished, produce an overload protection control signal;
One starts the actuator of defencive function, be connected with this pulse-width modulation control system, this second source, this first voltage potential generator and this timer respectively, when the output short circuit of this power supply unit, this voltage output potential produces pressure drop, and the actuator of this startup defencive function is promptly sent a silence signal to this pulse-width modulation control system; When the actuator of this startup defencive function was obtained this overload protection control signal, the actuator of this startup defencive function was promptly sent a silence signal to this pulse-width modulation control system;
One second voltage potential generator is in order to produce one second voltage potential;
The one maintenance system actuator that quits work, be connected with actuator and this second voltage potential generator of this pulse-width modulation control system, this startup defencive function, keep the out-of-work state of pulse-width modulation control system with continuation in order to the instruction that quits work that actuator transmitted that receives this startup defencive function; And
One second timer; be connected with the actuator of this startup defencive function and this maintenance system actuator that quits work; the actuator that is used for this startup defencive function picks up counting when sending this silence signal; when timing then; this maintenance system actuator that quits work sends promptly that working signal is to this pulse-width modulation control system at the beginning, and it is promptly started working.
8, huge flush out current as claimed in claim 7, short circuit and overload protection three in one circuit is characterized in that this second source comprises a rectification circuit.
9, huge flush out current as claimed in claim 7, short circuit and overload protection three in one circuit is characterized in that this second source comprises a capacitance-resistance discharge circuit.
10, huge flush out current as claimed in claim 7, short circuit and overload protection three in one circuit is characterized in that this timer is a rc charging circuit.
11, huge flush out current as claimed in claim 7, short circuit and overload protection three in one circuit is characterized in that this current detector is a resistance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 02120415 CN1459903A (en) | 2002-05-24 | 2002-05-24 | Huge flush out current, short circuit and overload protection three in one circuit |
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| CN 02120415 CN1459903A (en) | 2002-05-24 | 2002-05-24 | Huge flush out current, short circuit and overload protection three in one circuit |
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| CN 02120415 Pending CN1459903A (en) | 2002-05-24 | 2002-05-24 | Huge flush out current, short circuit and overload protection three in one circuit |
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| US8482946B2 (en) | 2005-08-18 | 2013-07-09 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current and over power protection for power converter |
| US8559152B2 (en) | 2010-12-08 | 2013-10-15 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
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| US9960674B2 (en) | 2015-05-15 | 2018-05-01 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for output current regulation in power conversion systems |
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2002
- 2002-05-24 CN CN 02120415 patent/CN1459903A/en active Pending
Cited By (34)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8482946B2 (en) | 2005-08-18 | 2013-07-09 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current and over power protection for power converter |
| US9647448B2 (en) | 2005-08-18 | 2017-05-09 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current and over power protection for power converter |
| US10277110B2 (en) | 2010-12-08 | 2019-04-30 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
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