CN102457051B - Transient current suppression device - Google Patents
Transient current suppression device Download PDFInfo
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- CN102457051B CN102457051B CN201010517242.XA CN201010517242A CN102457051B CN 102457051 B CN102457051 B CN 102457051B CN 201010517242 A CN201010517242 A CN 201010517242A CN 102457051 B CN102457051 B CN 102457051B
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Abstract
The invention discloses a transient current suppression device which is applicable to a fan. The transient current suppression device comprises a filtering circuit, a delay conduction circuit and a forced discharge circuit, wherein the filtering circuit outputs a first voltage signal and a first current signal according to a first power signal; the delay conduction circuit is electrically connected with the filtering circuit; the delay conduction circuit provides a first discharge path for the first current signal according to a second power signal after delay time and then outputs a second current signal; the forced discharge circuit is electrically connected with the delay conduction circuit and the filtering circuit; and the forced discharge circuit provides a second discharge path for the second current signal according to the first voltage signal. Therefore, the transient current suppression device can effectively and quickly suppress a transient current during energizing at each time.
Description
Technical field
The present invention relates to a kind of restraining device, particularly relate to a kind of transient current suppression device.
Background technology
Circuits System is apart from (Transient interval) when the variable condition time converted to needed for a stable state is called transient state in a flash, and the voltage when this transient state in distance or electric current are called transient voltage (Transient voltage) or transient current (Transient current).When direct current power source voltage is connected to electric capacity, electric capacity is considered as short circuit instantaneously, this electric capacity does not have internal resistance or has less internal resistance, make easily to produce larger moment transient current, if transient current flow to earth terminal, and this earth terminal is connected with the earth terminal of power circuit, it easily affects the system mode of power circuit, even damages inner electronic component.
Therefore for reducing the impact of transient current, please refer to shown in Fig. 1, it is the schematic diagram of existing transient current suppression device.Transient current suppression device 1 has filter circuit 11, turn on delay circuit 12 and a control circuit 13.Filter circuit 11 has an an electric capacity C and diode D.Turn on delay circuit 12 has one first resistance C1, one first electric capacity R1 and a first transistor Q1.
When first time Switching power switch or load hot plug time, filter circuit 11 receives one first power signal V1, and the first power signal V1 flows through diode D, and charges to electric capacity C, and now electric capacity C is just as short circuit, and produces one first current signal I1.Turn on delay circuit 12 receives a second source signal V2, and within a time of delay, charges to the first electric capacity C1, and after being full of electricity, the first electric capacity C1 will carry out electric discharge and conducting the first transistor Q1, to form one first discharge path.The first current signal I1 is made to flow through the first discharge path to earth terminal.
Above-mentioned transient current suppression device 1 can avoid the transient current that switch produces for the first time to backwash to power circuit.But, if when performing second time mains switch action or perform switch motion for several times within the short time, because the first electric capacity C1 still stores electric charge, therefore when second time performs the first moment of switch motion, the first transistor Q1 will conducting, make the first current signal I1 will flow to earth terminal immediately, and backwash to the earth terminal of the power circuit providing the first power signal V1 and second source signal V2.
Please refer to shown in Fig. 2, it is the current waveform figure of the first current signal I1 of Fig. 1.Wherein, the peak value of transient current is approximately 720mA, and steady-state current is approximately 200mA, and transient current is 3 to 4 times of steady-state current.Therefore, if transient current backwashes to power circuit, it will affect the state of power circuit, even damage inner electronic component, thus, power electric terminal fault may be caused, if power electric terminal is user's system, whole system also may be made to stop and cause greatest loss.
By this, how to provide a kind of easy circuit design to reduce transient current, and can be applicable to hot plug or short time open/close transient current suppression device, one of current important topic of real genus.
Summary of the invention
Because above-mentioned problem, object of the present invention can be applicable to hot plug or short time electric power on/off for providing one, and can suppress rapidly the transient current suppression device of transient current.
For achieving the above object, the invention provides a kind of transient current suppression device, it is applied to a fan, and transient current suppression device comprises a filter circuit, a turn on delay circuit and a forced electric discharge circuit.Filter circuit foundation one first power signal is to export one first voltage signal and one first current signal; Turn on delay circuit and filter circuit are electrically connected, and turn on delay circuit according to a second source signal, and provides one first discharge path to give the first current signal after a time of delay, and turn on delay circuit exports one second current signal; Forced electric discharge circuit and turn on delay circuit and filter circuit are electrically connected, and according to the first voltage signal, give the second current signal to provide one second discharge path.
In one embodiment of the invention, turn on delay circuit has one first electric capacity, one first resistance and a first transistor, and the gate terminal of one end of the first resistance and one end of the first electric capacity and the first transistor is electrically connected.
In one embodiment of the invention, forced electric discharge circuit has one second electric capacity and a transistor seconds, and one end of the second electric capacity and the gate terminal of transistor seconds are electrically connected.
In one embodiment of the invention, forced electric discharge circuit also has one second resistance, and one end of the second resistance and the gate terminal of transistor seconds are electrically connected.
For achieving the above object, the invention provides a kind of transient current suppressing method, itself and a transient current suppression device fit applications being applied to a fan, wherein this transient current suppression device comprises a filter circuit, a turn on delay circuit and a forced electric discharge circuit, suppressing method comprises the following step: by filter circuit according to one first power signal, to export one first voltage signal and one first current signal; By forced electric discharge circuit according to the first voltage signal, give this second current signal to provide one second discharge path; One second current signal is exported by turn on delay circuit; And by turn on delay circuit according to a second source signal, and after a time of delay, one first discharge path is provided to give the first current signal.
In one embodiment of the invention, within time of delay, also comprise following steps: by turn on delay circuit according to second source signal, to charge to one first electric capacity of turn on delay circuit; Carry out electric discharge and conducting one the first transistor by the first electric capacity, give the first current signal to provide the first discharge path.
In one embodiment of the invention, also comprise by forced electric discharge circuit according to the first voltage signal conducting one transistor seconds, and provide the second discharge path to give the second current signal.
From the above, because of according to a kind of transient current suppression device of the present invention, provide one second discharge path by forced electric discharge circuit, make in the first electric capacity is not yet discharged when, turn on delay circuit can export the second current signal according to the electric current of second source signal and the first capacitor discharge, and the second current signal is flow to earth terminal via the second discharge path.Therefore, transient current suppression device of the present invention makes a fan under repeatedly diverter switch, can suppress transient current rapidly, and when also can be applicable to hot plug or short time electric power on/off.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of existing transient current suppression device;
Fig. 2 is the oscillogram of existing transient current;
Fig. 3 is the schematic diagram of transient current suppression device of the present invention;
Fig. 4 is the circuit diagram of transient current suppression device of the present invention; And
Fig. 5 is the oscillogram of transient current of the present invention.
Reference numeral explanation
1,2: transient current suppression device
11,21: filter circuit
12,22: turn on delay circuit
13,24: control circuit
23: forced electric discharge circuit
C: electric capacity
C 1: the first electric capacity
C2: the second electric capacity
D: diode
I1, I11: the first current signal
I12: the second current signal
Q1: the first transistor
Q2: transistor seconds
R1: the first resistance
R2: the second resistance
V1, V11: the first power signal
V2, V12: second source signal
V3, V13: the first voltage signal
Embodiment
Hereinafter with reference to relevant drawings, illustrate according to present pre-ferred embodiments.
Please refer to shown in Fig. 3, Fig. 3 is a schematic diagram of the transient current suppression device of present pre-ferred embodiments.Transient current suppression device 2 is applied to a fan, and transient current suppression device 2 comprises power circuit (figure does not show), filter circuit 21, turn on delay circuit 22, forced electric discharge circuit 23 and a control circuit 24.
Power circuit and filter circuit 21 and turn on delay circuit 22 are electrically connected, and export an one first power signal V11 and second source signal V12 respectively to filter circuit 21 and turn on delay circuit 22.Wherein, the first power signal V11 and second source signal V12 can be provided by a power circuit, or can be provided respectively by two power circuits.In addition, be main power source because second source signal V12 is non-, therefore, the first power signal V11 of the present embodiment is greater than second source signal V12.
Filter circuit 21 according to the first power signal V11 to export one first voltage signal V13 and one first current signal I11.
Turn on delay circuit 22 and filter circuit 21 are electrically connected, turn on delay circuit 22 is according to second source signal V12, and after a time of delay, provide one first discharge path to give the first current signal I11, and turn on delay circuit 22 exports one second current signal I12.
Forced electric discharge circuit 23 is electrically connected with filter circuit 21 and turn on delay circuit 22, and forced electric discharge circuit 23 gives the second current signal I12 according to the first voltage signal V13 to provide one second discharge path.
Control circuit 24 and filter circuit 21 are electrically connected, and receive the first voltage signal V13 and second source signal V12.
Please refer to shown in Fig. 4, it is a circuit diagram of fan rotation speed control apparatus of the present invention.Below, framework and the start of the filter circuit 21 of transient current suppression device 2 of the present invention, turn on delay circuit 22 and forced electric discharge circuit 23 are described in detail in detail.In addition, the aspect shown in Fig. 4 is aid illustration, and is not used to limit the present invention.
Filter circuit 21 has one end of an electric capacity C and a diode D, electric capacity C and one end of diode D and control circuit 24 and forced electric discharge circuit 23 and is electrically connected, and the other end of electric capacity C and turn on delay circuit 22 are electrically connected.Filter circuit 21 receives the first power signal V11, after diode D filtering, produce one first voltage signal V13.First voltage signal V13 charges to electric capacity C, and now electric capacity C is just as short circuit, and produces one first current signal I11.The first current signal I11 of the present embodiment has a transient current.
Turn on delay circuit 22 has one first electric capacity C1, one first resistance R1 and a first transistor Q1.One end of first resistance R1 and one end of the first electric capacity C1 and the gate terminal of the first transistor Q1 are electrically connected, and the other end of the first resistance R1 receives second source signal V12, and the other end of the first electric capacity C1 and the first transistor Q1 are wherein connected to earth terminal in one end.Wherein, the first transistor Q1 can be a P-type crystal pipe or a N-type transistor, is for a N-type transistor in this.Turn on delay circuit 22 receives second source signal V12, after the first resistance R1 current limliting, first electric capacity C1 is charged, and after the first electric capacity C1 is full of, to discharge and conducting the first transistor Q1, give the first current signal I11 to produce one first discharge path and to provide, make the first current signal I11 can flow through the first discharge path.
Forced electric discharge circuit 23 has one second electric capacity C2, one second resistance R2 and a transistor seconds Q2.One end of second electric capacity C2 and one end of the second resistance R2 and the gate terminal of transistor seconds Q2 are electrically connected, the other end of the second electric capacity C2 receives the first voltage signal V13, and the other end of the second resistance R2 and transistor seconds Q2 one end are wherein connected to earth terminal.Forced electric discharge circuit 23 receives the first voltage signal V13, to charge to the second electric capacity C2, and conducting transistor seconds Q2, give the second current signal I12 to produce one second discharge path and to provide, make the second current signal I12 can flow through the second discharge path.In addition, the second resistance R2 of the present embodiment according to the difference of circuit design, and can determine whether arrange the second resistance R2.
The suppressing method that the present invention also discloses a kind of transient current suppression device is that the transient current suppression device being applied to a fan with coordinates and uses.Suppressing method comprises the following step: by filter circuit according to one first power signal, to export one first voltage signal and one first current signal; By forced electric discharge circuit according to the first voltage signal, to provide the second discharge path; Export one second current signal by turn on delay circuit, and flow through the second discharge path; And by turn on delay circuit according to a second source signal, and after a time of delay, one first discharge path is provided to give the first current signal.Below describe, shown in Fig. 4 in detail, the suppressing method of transient current suppression device 2 of the present invention is described in detail.
In time performing first time Switching power switch or load hot plug time, provide an one first power signal V11 and second source signal V12 be delivered to filter circuit 21 and turn on delay circuit respectively by a power circuit.
By filter circuit 21 according to one first power signal V11, one first voltage signal V13 is exported to forced electric discharge circuit 23 and control circuit 24 after diode D filtering, the first voltage signal V13 that continues charges to electric capacity C, and exports one first current signal I11.
By forced electric discharge circuit 23 according to the first voltage signal V13, charge to the secondth electric capacity C2, now the second electric capacity C3 is short circuit, and the first voltage signal V13 conducting transistor seconds Q2, and then form one second discharge path.
In addition, by turn on delay circuit 22 according to a second source signal V12, within one period of time of delay, second source signal V12 charges to the first electric capacity C1, after the first electric capacity C1 is full of electricity, carry out electric discharge and conducting the first transistor Q1 by the first electric capacity C1, to form one first discharge path, make the first current signal I11 can flow through the first transistor Q1 to earth terminal.
Therefore, when second source signal V12 charges to the first electric capacity C1, some of second source signal V12 converts one second current signal I12 to, flows through the second discharge path to earth terminal.And the electric current that the first electric capacity C1 discharges is convertible into the second current signal I12, and flow through the second discharge path to earth terminal.
Finally, after the electric capacity C of filter circuit 21 is full of, then electric capacity C will form open circuit, and be discharged to control circuit 24.In addition, after the second electric capacity C2 is full of electricity, will discharge to the second resistance R2 and transistor seconds Q2.
In time performing the action of second time diverter switch or load hot plug or execution several ground mains switch, power circuit also provides the first power signal V11 and second source signal V12 to filter circuit 21 and control circuit 22.
Filter circuit 21 according to the first power signal V11 to export one first voltage signal V13 and one first current signal I11.Forced electric discharge circuit 23 according to one first voltage signal V13, the second electric capacity C2 transient state short circuit, and conducting transistor seconds Q2 is to form one second discharge path.
Turn on delay circuit 22 is within a time of delay, and turn on delay circuit 22 charges to the first electric capacity C1 according to second source signal V12, and the second source signal V12 of part can be exchanged into the second current signal I12, and flows through the second discharge path.After the first electric capacity C1 is full of electricity, first electric capacity C1 will carry out electric discharge and conducting the first transistor Q1, but the electric current of part electric discharge also can be produced as the second current signal I12, and flow to earth terminal through the second discharge path, that is the second current signal I12 flow to earth terminal through transistor seconds Q2.
If the time interval performing first time and second time Switching power switch is time shorter, if and the first electric capacity C1 still stores electric charge, the second source signal V12 that major part inputs by the transient current suppression device 2 of the present embodiment converts the second current signal I12 to, and flow to earth terminal via the second discharge path.To avoid when second time performs the first moment of mains switch, second source signal V12 conducting the first transistor Q1, makes the transient current of the first current signal I11 flow to earth terminal immediately.
In addition, second source signal V12 due to the present embodiment is non-is main power source, only as the use of conducting the first transistor Q1, therefore, the electric current of the second current signal I12 that turn on delay circuit 22 exports can be less than the first current signal I11, even if make the second current signal I12 flow to earth terminal through the second discharge path, and when backwashing to power circuit earth terminal, also not too large on the impact of power circuit.
Please refer to shown in Fig. 5, it is an oscillogram of the transient current of the second current signal I11 of Fig. 4.Wherein, the transient current peak value of the second current signal I11 of the present invention is approximately 392mA, with the existing transient current of Fig. 2 in comparison, transient current suppression device of the present invention obviously effectively can suppress transient current, and the transient current of 50% can be suppressed nearly, also do not affect the situation of stable state.
In sum, because of according to a kind of transient current suppression device of the present invention, provide one second discharge path by forced electric discharge circuit, make in the first electric capacity is not yet discharged when, turn on delay circuit can export the second current signal according to the electric current of second source signal and the first capacitor discharge, and the second current signal is flow to earth terminal via the second discharge path.Therefore, transient current suppression device of the present invention makes a fan under repeatedly diverter switch, can suppress transient current rapidly, and when also can be applicable to hot plug or short time electric power on/off.
The foregoing is only illustrative, but not be restricted.Anyly do not depart from spirit of the present invention and category, and to its equivalent modifications of carrying out or change, all should be contained in claim of the present invention.
Claims (10)
1. a transient current suppression device, is applied to a fan, comprises:
One filter circuit, according to one first power signal to export one first voltage signal and one first current signal;
One turn on delay circuit, is electrically connected with this filter circuit, and this turn on delay circuit according to a second source signal, and provides one first discharge path to give this first current signal after a time of delay, and this turn on delay circuit exports one second current signal; And
One forced electric discharge circuit, is electrically connected with this turn on delay circuit and this filter circuit;
Wherein this forced electric discharge circuit has an electric capacity and a transistor, and the gate terminal of one end of this electric capacity and this transistor is electrically connected, and the other end of this electric capacity and this filter circuit are electrically connected,
Wherein the electric capacity of this forced electric discharge circuit charges and the capacitance short-circuit of this forced electric discharge circuit according to the first voltage signal exported from this filter circuit, and this transistor of this forced electric discharge circuit gives this second current signal by the first voltage signal conducting to form the second discharge path.
2. transient current suppression device as claimed in claim 1, also comprises:
One power circuit, provides this first power signal and/or this second source signal.
3. transient current suppression device as claimed in claim 1, wherein this filter circuit has an electric capacity, and one end of this electric capacity and this turn on delay circuit are electrically connected, and the other end of this electric capacity exports this first voltage signal.
4. transient current suppression device as claimed in claim 1, wherein this turn on delay circuit has one first electric capacity, one first resistance and a first transistor, and the gate terminal of one end of this first resistance and one end of this first electric capacity and this first transistor is electrically connected.
5. transient current suppression device as claimed in claim 4, wherein this first transistor is a P-type crystal pipe or a N-type transistor.
6. transient current suppression device as claimed in claim 1, wherein this forced electric discharge circuit also has a resistance, and the gate terminal of this transistor of one end of this resistance and this forced electric discharge circuit is electrically connected.
7. transient current suppression device as claimed in claim 1, also comprises:
One control circuit, is electrically connected with this filter circuit, and receives this first voltage signal.
8. a transient current suppressing method, the transient current suppression device fit applications being applied to a fan with one, wherein this transient current suppression device comprises a filter circuit, a turn on delay circuit and a forced electric discharge circuit, wherein this forced electric discharge circuit has an electric capacity and a transistor, the gate terminal of one end of this electric capacity and this transistor is electrically connected, and the other end of this electric capacity and this filter circuit are electrically connected, and this suppressing method comprises the following step:
By this filter circuit according to one first power signal, to export one first voltage signal and one first current signal;
According to the capacitor charging that the first voltage signal exported from this filter circuit is this forced electric discharge circuit, the wherein electric capacity of this forced electric discharge circuit now short circuit;
By this transistor of first this forced electric discharge circuit of voltage signal conducting to form the second discharge path;
By this forced electric discharge circuit according to this first voltage signal, to provide one second discharge path;
Export one second current signal by this turn on delay circuit, and flow through this second discharge path; And
By this turn on delay circuit according to a second source signal, and after a time of delay, one first discharge path is provided to give this first current signal.
9. suppressing method as claimed in claim 8, wherein this turn on delay circuit has one first electric capacity, one first resistance and a first transistor, and one end of this first electric capacity and one end of this first resistance and this first transistor are electrically connected.
10. suppressing method as claimed in claim 9, wherein within this time of delay, also comprises following steps:
By this turn on delay circuit according to this second source signal, to charge to this first electric capacity of this turn on delay circuit; And
Carry out electric discharge and this first transistor of conducting by this first electric capacity, give this first current signal to provide this first discharge path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010517242.XA CN102457051B (en) | 2010-10-19 | 2010-10-19 | Transient current suppression device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010517242.XA CN102457051B (en) | 2010-10-19 | 2010-10-19 | Transient current suppression device |
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| Publication Number | Publication Date |
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| CN102457051A CN102457051A (en) | 2012-05-16 |
| CN102457051B true CN102457051B (en) | 2015-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010517242.XA Active CN102457051B (en) | 2010-10-19 | 2010-10-19 | Transient current suppression device |
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| CN (1) | CN102457051B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245074B (en) * | 2017-08-21 | 2019-11-19 | 福州福大海矽微电子有限公司 | Protection circuit for the hot plug detection port between CPU and linker |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6114797A (en) * | 1997-05-27 | 2000-09-05 | Face International Corp. | Ignition circuit with piezoelectric transformer |
| US6246153B1 (en) * | 1998-07-16 | 2001-06-12 | Face International Corp. | Positive feedback resonant transducer circuit |
| CN1431747A (en) * | 2002-01-08 | 2003-07-23 | 台达电子工业股份有限公司 | Circuit for restraining surge current |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5483389B2 (en) * | 2008-01-31 | 2014-05-07 | Ｉｄｅｃ株式会社 | electric circuit |
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2010
- 2010-10-19 CN CN201010517242.XA patent/CN102457051B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6114797A (en) * | 1997-05-27 | 2000-09-05 | Face International Corp. | Ignition circuit with piezoelectric transformer |
| US6246153B1 (en) * | 1998-07-16 | 2001-06-12 | Face International Corp. | Positive feedback resonant transducer circuit |
| CN1431747A (en) * | 2002-01-08 | 2003-07-23 | 台达电子工业股份有限公司 | Circuit for restraining surge current |
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| CN102457051A (en) | 2012-05-16 |
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