CN100544154C - Burst current control circuit - Google Patents
Burst current control circuit Download PDFInfo
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- CN100544154C CN100544154C CNB2006100352449A CN200610035244A CN100544154C CN 100544154 C CN100544154 C CN 100544154C CN B2006100352449 A CNB2006100352449 A CN B2006100352449A CN 200610035244 A CN200610035244 A CN 200610035244A CN 100544154 C CN100544154 C CN 100544154C
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Abstract
The invention discloses a kind of burst current control circuit, mainly be in a main loop, one first control unit and one second control unit to be set, and first and second control units all have one of parallel with one another a current-limiting resistance and a controlled switch with the impedance tandem mode; Wherein, the current-limiting resistance of first control unit is connected moment and one of is produced burst current in order to the anti-AC power that terminates in, its controlled switch is then according to the voltage of storage capacitor and conducting, so that electric current strides across first current-limiting resistance, the current-limiting resistance of second control unit then switches the burst current that moment produced in order to the anti-level that terminates in AC power, its controlled switch is then according to AC power and conducting, so that electric current strides across second current-limiting resistance.
Description
Ji Intraoperative field
The present invention is relevant for a kind of power control circuit, particularly relevant for a kind of burst current control circuit.
Bei Jing Ji Intraoperative
Burst current (inrush current) is a ubiquitous problem in the power supply supply framework, it usually occurs in the moment of power supply conducting just, can produce excessive immediate current this moment, thereby cause noise to produce, or even cause source element or load damage.For preventing the generation of burst current here, following custom circuit framework so develop.
Conventional burst current control circuit is provided with a current-limiting resistance and is connected in series with input circuit; burst current is limited within the safety level; it is quite big that yet the resistance value of serial connection needs, and therefore regular meeting wastes power when the system body normal operation, and produces unnecessary heat.
With reference to Fig. 1, it is another conventional burst current control circuit, main framework is constituted with rectification circuit BR, storage capacitor C and system body, wherein utilizes the thermistor RT of a negative temperature coefficient to be arranged at the alternating current source, can take advantage of the burst current of generation with control.It is to utilize thermistor RT resistance value when low temperature higher, and the lower characteristic of resistance value during high temperature, just opened or the moment of AC power input in the electronic installation of application, because of thermistor RT self-temperature is lower, and provide a higher resistance value to suppress the generation of burst current in the alternating current side; And, can Yin Wendu raise and reduce in work a period of time resistance value, thereby can enter normal operating state.But this framework still has power dissipation big and can't bring into play problem such as effect in hot open state and exist.
With reference to Fig. 2, it is another conventional burst current control circuit, mainly is in the alternating current source one a current-limiting resistance R and a controlled switch SW to be set, to reach the function that suppresses surging.In this, initial when power turn-on, current-limiting resistance R can carry out preliminary current-limiting function, and this moment, storage capacitor C did not begin charging as yet, and therefore whole current value is quite high, so may undermine other source element; Then, storage capacitor C charging is finished, and electric current also reduces, yet its value is still very high, and hereat current-limiting resistance R can continue to emit a large amount of heat; At last, cause controlled switch SW conducting, stride across the effect of (bypass) current-limiting resistance R, and then prevent that the situation that current-limiting resistance R whole efficiency that heat radiation causes reduces from taking place to reach electric current such as relay (relay).Yet, when the characteristic of relay continues to be positioned at conducting state, cause damage easily.
With reference to Fig. 3, it is another conventional burst current control circuit, mainly is to utilize two controlled switch SW1, SW2 to control the burst current that may produce.By among the figure as can be known, two controlled switch SW1, SW2 are located at the anode of rectification circuit BR and storage capacitor C, and the voltage signal that utilizes the high-pressure side of system body comes controlled switch SW1, SW2 are controlled, therefore it is high pressure resistant that the component specification of use needs energy, has problems such as circuit complexity and element cost height to cause this framework.
Another kind of burst current control circuit is to utilize a timing switch to control the burst current that may produce.Wherein, after AC power starts, provide the function of current limliting at this moment by current-limiting resistance, after power supply is stable, even electric current strides across current-limiting resistance.And behind Ac Dump, this moment, timing switch also can cut out.Usually behind Ac Dump, the voltage of inner direct current supply rail descends, and this moment, timing switch promptly can cut out.And this mode also has the problem that is same as the method that adopts thermistor, and promptly timing switch needs a special time to be returned to off state, therefore can not connect immediately behind Ac Dump, otherwise current-limiting resistance one is in the state of striding across, and can't reaches inhibition.
From the above, the space that in the design of burst current control circuit, still has it to improve.
Summary of the invention
In view of above problem, main purpose of the present invention is to provide a kind of burst current control circuit, the problem of the burst current that solves prior art thus and disclosed.
Therefore, for reaching above-mentioned purpose, the burst current control circuit that the present invention disclosed comprises: a rectification unit, an Active PFC unit, a storage capacitor, one first control unit and one second control unit.
Wherein, rectification unit and Active PFC unit link and form the main loop of this burst current control circuit, and storage capacitor is arranged in the system body, links with the Active PFC unit.First control unit is arranged between rectification unit and the Active PFC unit, and second control unit then forms impedance with first control unit and is connected in series.That is to say, second control unit can the serial connection mode be series at any position of this burst current control circuit, and promptly this second control unit can be arranged between first control unit and the Active PFC unit, is arranged between the negative terminal of Active PFC unit and rectification unit, is arranged at one of AC power side or is arranged between the anode and first control unit of rectification unit.
In this, first control unit has one first current-limiting resistance and one first controlled switch, and second control unit then has one second current-limiting resistance and one second controlled switch.Wherein, first and second controlled switchs are connected to first and second current-limiting resistances respectively.And this first controlled switch is mainly according to the voltage of the direct voltage of generation and storage capacitor and switch, and second controlled switch is then according to the supply of AC power and switch.
In this, first current-limiting resistance is connected moment and one of is produced burst current in order to the anti-AC power that terminates in, and first controlled switch is then according to the voltage of storage capacitor and conducting, and then makes electric current stride across first current-limiting resistance.Second current-limiting resistance switches the burst current that moment produced in order to the anti-level that terminates in AC power, and second controlled switch is then according to AC power and conducting, and then makes electric current stride across second current-limiting resistance.
Wherein, when the voltage of storage capacitor was stablized, first controlled switch can open circuit certainly and transfer conducting to, and when Ac Dump, first controlled switch then can transfer to from conducting and opening circuit.Moreover second controlled switch is then after the level of AC power switches a given time and the diverter switch state; In other words, when reaching given time after AC power is connected, second controlled switch can open circuit certainly and transfer conducting to; When AC power reached given time after high level switches to low level, second controlled switch then transferred to from conducting and opening circuit; When AC power reached given time after low level switches to high level, then second controlled switch then transferred conducting to from opening circuit; And when reaching given time behind the Ac Dump, second controlled switch then transfers to from conducting and opening circuit.Wherein, this given time can determine according to overal system design.
In addition, the burst current control circuit according to the present invention more comprises: an AC power circuit for detecting is connected between the input and second control unit of AC power, to control the switching of second controlled switch according to AC power.
Description of drawings
Fig. 1 is the summary structure chart of conventional burst current control circuit;
Fig. 2 is the summary structure chart of another conventional burst current control circuit;
Fig. 3 is the summary structure chart of another conventional burst current control circuit again;
Fig. 4 is the summary structure chart according to the burst current control circuit of first embodiment of the invention;
Fig. 5 is the summary structure chart according to the burst current control circuit of second embodiment of the invention;
Fig. 6 is the summary structure chart according to the burst current control circuit of third embodiment of the invention;
Fig. 7 is the summary structure chart according to the burst current control circuit of fourth embodiment of the invention;
Fig. 8 is the summary structure chart according to the burst current control circuit of fifth embodiment of the invention;
Fig. 9 is the sequential chart according to the burst current control circuit of the embodiment of the invention; And
Figure 10 is the summary structure chart according to the burst current control circuit of sixth embodiment of the invention.
Embodiment
Relevant characteristics and implementation of the present invention cooperate graphicly to be described in detail as follows as most preferred embodiment now.
With reference to Fig. 4, it is the burst current control circuit according to one embodiment of the invention, includes: a rectification unit BR, one first control unit 10, one second control unit 20, an Active PFC unit PFC and a storage capacitor C.
Wherein, rectification unit and Active PFC unit link and form the main loop of this burst current control circuit, and the storage capacitor in the system body then forms in parallel with the Active PFC unit.First control unit is arranged between rectification unit and the Active PFC unit, and second control unit then forms impedance with first control unit and is connected in series.That is to say that with impedance, first control unit and second control unit electrically are serially connected with in the main loop of this burst current control circuit.In this embodiment, as shown in Figure 4, first control unit 10 is serially connected with the anode of rectification unit BR, and second control unit 20 then is serially connected with between first control unit 10 and the Active PFC unit PFC.So, this second control unit 20 also is serially connected with between the negative terminal of Active PFC unit PFC and rectification unit BR (as shown in Figure 5), also or be serially connected with AC power Vac side (shown in Fig. 6,7).
Because its effect is identical haply, thus below only describe with the circuit framework of Fig. 4.
With reference to Fig. 8, this first control unit 10 has one first current-limiting resistance R1 and one first controlled switch SW1, and second control unit 20 then has one second current-limiting resistance R2 and one second controlled switch SW2.This first and second controlled switch SW1, SW2 can be a relay switch, diode, transistor or metal oxide semiconductor field effect transistor (MOSFET).And this first and second current-limiting resistance can be general resistance or be a thermistor.
In this, the first and second controlled switch SW1, SW2 are connected to the first and second current-limiting resistance R1, R2 respectively.Wherein, the first controlled switch SW1 is mainly according to the voltage of the direct voltage of generation and storage capacitor C and switch, and the second controlled switch SW2 is then according to the supply of AC power Vac and switch.
When detecting power supply (when being the AC power connection), the first and second controlled switch SW1, SW2 were in and opened circuit this moment, and the first and second current-limiting resistance R1, R2 can provide the function of current limliting, with the storage capacitor C in the restriction inflow system body and the size of current of system body, so that storage capacitor C tentatively charges, and then avoid the generation of burst current.A period of time after opening, power supply reaches when stablizing, and the first and second controlled switch SW1, SW2 transfer conducting to by opening circuit, and then stride across the first and second current-limiting resistance R1, R2 supplying electric current, so that system body enters a normal operation pattern.
In this, because the second controlled switch SW2 then controls according to the supply of AC power Vac.Therefore when AC power reached low level state, the second controlled switch SW2 can and then transfer to from conducting and opening circuit, to avoid AC power in the burst current that high level was produced that reaches following one-period.In other words, the second controlled switch SW2 can switch according to AC power, that is to say, when AC power startup, cut-out, high-low level were switched, the second controlled switch SW2 can and then switch and opens circuit or the state of conducting.
As shown in Figure 9, it is the sequential chart according to the burst current control circuit of one embodiment of the invention, in figure, the Vac of the superiors is the sequential of AC power, the Vcc of the second layer is the sequential of the DC power supply of first and second controlled switchs, the 3rd layer is the sequential of system body, and fourth, fifth layer is respectively the sequential of the first and second controlled switch SW1, SW2, and the C of orlop is the sequential of storage capacitor.Scheme as can be known thus, when AC power Vac had just started, the first controlled switch SW1 was the state that opens circuit, and this moment, storage capacitor C began charging.Reach when stablizing after starting, the first controlled switch SW1 transfers conducting to by opening circuit, and therefore can make system body enter a normal operation pattern.When AC power Vac cut off, the first controlled switch SW1 then and then transferred the state that opens circuit to.The second controlled switch SW2 reaches when stablizing after AC power Vac starts, transfer conducting to from opening circuit, and after high level switches to low level (or switch to high level from low level) and reaches a given time, transfer to from conducting and to open circuit (or open circuit certainly transfer conducting to) in AC power Vac.And after AC power Vac cuts off a given time time, the second controlled switch SW2 then can transfer the state that opens circuit to from conducting.Wherein, this given time can determine according to overal system design.
In this, the second controlled switch SW2 can control by an AC power circuit for detecting 30, as shown in figure 10.In this, this AC power circuit for detecting 30 mainly comprises an AC power detector 32, it is connected the positive and negative two ends of AC power respectively with diode by the resistance of one group of serial connection, with the variation of detecting AC power, and according to detecting the switching that the result controls the second controlled switch SW2.In essence, these collocation methods only are embodiments of the invention, and so other various similar variant that does not break away from the present invention's spirit and scope all should belong in the present invention's the scope of patent protection.
Claims (17)
1. burst current control circuit comprises:
One rectification unit is in order to carry out rectification to an AC power;
One Active PFC unit connects the anode and the negative terminal of this rectification unit;
One storage capacitor connects the negative terminal of this Active PFC unit and this rectification unit;
One first control unit is arranged between this rectification unit and this Active PFC unit, comprising:
One first current-limiting resistance is connected moment and one of is produced burst current in order to anti-this AC power that terminates in; And
One first controlled switch, and connect this first current-limiting resistance with according to the voltage of this storage capacitor and conducting, and then makes electric current stride across this first current-limiting resistance; And
One second control unit forms impedance with this first control unit and is connected in series, and comprising:
One second current-limiting resistance switches the burst current that moment produced in order to the anti-level that terminates in this AC power; And
One second controlled switch, and connect this second current-limiting resistance with according to this AC power and conducting, and then makes electric current stride across this second current-limiting resistance.
2. burst current control circuit according to claim 1 is characterized in that described second controlled switch is after the level of this AC power switches a given time and the diverter switch state.
3. as the burst current control circuit as described in the claim 2, when it is characterized in that described second controlled switch reaches this given time after this AC power is connected, transfer conducting to and open circuit certainly.
4. as the burst current control circuit as described in the claim 2, it is characterized in that described second controlled switch when this AC power reaches this given time after a high level switches to a low level, open circuit and transfer to from conducting.
5. as the burst current control circuit as described in the claim 2, it is characterized in that described second controlled switch when this AC power reaches this given time after a low level switches to a high level, transfers conducting to and open circuit certainly.
6. as the burst current control circuit as described in the claim 2, when it is characterized in that described second controlled switch reaches this given time behind this Ac Dump, open circuit and transfer to from conducting.
7. burst current control circuit according to claim 1 is characterized in that described first controlled switch is when the voltage of this storage capacitor is stablized and open circuit certainly and transfer conducting to.
8. burst current control circuit according to claim 1, it is characterized in that described first controlled switch transfers to when this Ac Dump and from conducting opens circuit.
9. burst current control circuit according to claim 1 is characterized in that described second control unit is arranged between this first control unit and this Active PFC unit.
10. burst current control circuit according to claim 1 is characterized in that described second control unit is arranged between the negative terminal of this Active PFC unit and this rectification unit.
11. burst current control circuit according to claim 1 is characterized in that described second control unit is arranged at one of this AC power side.
12. burst current control circuit according to claim 1 is characterized in that described second control unit is arranged between the anode and this first control unit of this rectification unit.
13. burst current control circuit according to claim 1, it is characterized in that described burst current control circuit more comprises: an AC power circuit for detecting, be connected between the input and this second control unit of this AC power, to control the switching of this second controlled switch according to this AC power.
14. burst current control circuit according to claim 1 is characterized in that described first current-limiting resistance is a thermistor.
15. burst current control circuit according to claim 1 is characterized in that described second current-limiting resistance is a thermistor.
16. burst current control circuit according to claim 1 is characterized in that described first controlled switch is selected from relay switch, diode or metal oxide semiconductor field effect transistor.
17. burst current control circuit according to claim 1 is characterized in that described second controlled switch is selected from relay switch, diode or metal oxide semiconductor field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100352449A CN100544154C (en) | 2006-04-28 | 2006-04-28 | Burst current control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100352449A CN100544154C (en) | 2006-04-28 | 2006-04-28 | Burst current control circuit |
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| CN101064428A CN101064428A (en) | 2007-10-31 |
| CN100544154C true CN100544154C (en) | 2009-09-23 |
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| CNB2006100352449A Active CN100544154C (en) | 2006-04-28 | 2006-04-28 | Burst current control circuit |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101982916A (en) * | 2010-11-29 | 2011-03-02 | 山东电力研究院 | Fault current limiter |
| CN102386618A (en) * | 2011-11-25 | 2012-03-21 | 苏州市万松电气有限公司 | Switch current limiter for heat-tracing transformer |
| CN104218824B (en) * | 2013-05-29 | 2016-12-28 | 群光电能科技股份有限公司 | The shunting device of negative tempperature coefficient thermistor |
| TWM477733U (en) * | 2013-12-20 | 2014-05-01 | Chicony Power Tech Co Ltd | Power supply apparatus with variable circuit loop impedance |
| CN110247614B (en) * | 2014-04-16 | 2021-05-11 | 北海建准电子有限公司 | Motor control circuit |
| JP6491344B2 (en) * | 2015-09-17 | 2019-03-27 | 富士通フロンテック株式会社 | Paper sheet handling device and control method of paper sheet handling device |
| TWI687015B (en) * | 2018-06-04 | 2020-03-01 | 偉訓科技股份有限公司 | Power supply with surge current suppression |
| CN110137930B (en) * | 2019-05-08 | 2021-12-14 | 苏州佳世达电通有限公司 | Overload protection device, overload protection method and USB interface |
| CN110543225A (en) * | 2019-07-31 | 2019-12-06 | 苏州浪潮智能科技有限公司 | power supply hot plug module |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4271448A (en) * | 1979-11-13 | 1981-06-02 | Acme Cleveland Corporation | Electronic protection circuit for solid state switches energizing AC loads |
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2006
- 2006-04-28 CN CNB2006100352449A patent/CN100544154C/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4271448A (en) * | 1979-11-13 | 1981-06-02 | Acme Cleveland Corporation | Electronic protection circuit for solid state switches energizing AC loads |
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| CN101064428A (en) | 2007-10-31 |
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