CN107294508A - A kind of LC filters - Google Patents
A kind of LC filters Download PDFInfo
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- CN107294508A CN107294508A CN201610193278.4A CN201610193278A CN107294508A CN 107294508 A CN107294508 A CN 107294508A CN 201610193278 A CN201610193278 A CN 201610193278A CN 107294508 A CN107294508 A CN 107294508A
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- Prior art keywords
- damping device
- filters
- circuit
- adaptive damping
- supervisory circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
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Abstract
The invention discloses a kind of LC filters, including：The inductance component being arranged between signal input part and signal output part and capacitor element, the inductance component and capacitor element constitute LC filter circuits, in addition to：The adaptive damping device connected with the LC filter circuits and the supervisory circuit being connected with the adaptive damping device, the supervisory circuit adjust the adaptive damping device in real time according to the voltage pulsation of signal input part and/or signal output part.The present invention in LC filter circuits by adding adaptive damping device and supervisory circuit, supervisory circuit is used for the voltage pulsation for detecting signal input part or signal output part, and control adaptive damping device to change its damping, so as to avoid that electricity/discharge process in big non-damping occurs in circuit, make circuit smoothes is transitioned into stable state.
Description
Technical field
The present invention relates to filter circuit, more particularly to a kind of LC filters.
Background technology
For the stability of the supply voltage that ensures circuit-board card, it is to avoid circuit produces fluctuation due to conduction or radiation interference, we often can filter out the clutter that power input is brought into or circuit is produced in itself in power input one LC filter circuit of access.Typical LC filter circuit constructions are as shown in figure 1, it includes：Inductance L1, the first electric capacity C1 and the second electric capacity C2, wherein, the first electric capacity C1 capacitance is than larger, generally higher than 10uf, and for filtering out low-frequency interference signal, the second electric capacity C2 capacitance is smaller, generally less than 1uf, for filtering out high-frequency interferencing signal.But, when power input accesses an above-mentioned LC filter circuit, a high-frequency oscillation signal can be produced at load two ends in upper electricity and shutdown transient.Now twice close to input voltage of oscillating voltage amplitude; more seriously, in shutdown transient, vibration can also produce backward voltage; if corresponding load circuit and the electric capacity at load two ends do not take corresponding safeguard measure, it will produce very big damage to loading and loading two ends electric capacity in parallel.
The content of the invention
The present invention provides a kind of LC filters, to solve easily to occur oscillation problem in electricity or power process on traditional LC filter circuit.
In order to solve the above technical problems, the present invention provides a kind of LC filters, including：The inductance component being arranged between signal input part and signal output part and capacitor element, the inductance component and capacitor element constitute LC filter circuits, in addition to：The adaptive damping device connected with the LC filter circuits and the supervisory circuit being connected with the adaptive damping device, the supervisory circuit adjusts the circuit oscillation of electricity and shutdown transient LC filter circuits in the adaptive damping device, consumption according to the voltage pulsation of signal input part and/or signal output part in real time.
Preferably, the adaptive damping device includes Switch device and the resistance being connected with Switch device.
Preferably, the Switch device is relay.
Preferably, the adaptive damping device uses crystal type field-effect transistor.
Preferably, the supervisory circuit is connected respectively with the same side of the signal input part and signal output part, and the same side is the place end of the adaptive damping device and inductance component.
Preferably, the supervisory circuit is connected respectively with the two ends of the signal input part.
Preferably, the supervisory circuit is also connected respectively with the two ends of the signal output part.
Preferably, the supervisory circuit adjusts the adaptive damping device according to the voltage difference of signal input part and signal output part.
Compared with prior art, the present invention has advantages below：
1st, adaptive damping device and supervisory circuit are had additional in the present invention, the resistance of adaptive damping device is controlled by voltage monitoring device, and change with input voltage and change, the supervisory circuit can monitor the resistance of input voltage signal change regulation adaptive damping device, can be with the voltage pulsation of real time detection signal input or signal output part by supervisory circuit and adaptive damping device, and control adaptive damping device to change its damping, so as to avoid occurring in circuit electricity or discharge process in big non-damping, make circuit smoothes is transitioned into stable state；
2nd, adaptive damping device can be that switchtype device and resistance are combined, or such as JFET of the device with variable resistor property pipes (crystal type field-effect transistor), simple in construction, with low cost.
Brief description of the drawings
Fig. 1 is the structural representation of existing LC filter circuits；
Fig. 2 is a kind of structural representation of LC filters in the embodiment of the present invention 1；
Fig. 3 is a kind of workflow diagram of LC filters in the embodiment of the present invention 1；
Fig. 4 is the structural representation of adaptive damping device in the embodiment of the present invention 1；
Fig. 5 is a kind of structural representation of LC filters in the embodiment of the present invention 2；
Fig. 6 is a kind of workflow diagram of LC filters in the embodiment of the present invention 2；
Fig. 7 is a kind of structural representation of LC filters in the embodiment of the present invention 3；
Fig. 8 is a kind of workflow diagram of LC filters in the embodiment of the present invention 3
In Fig. 1：L1- inductance, the electric capacity of C1- first, the electric capacity of C2- second；
Fig. 2 to Fig. 4：301- signal input parts, 302- adaptive dampings device, 3021- breakers, 3022- resistance, 303- supervisory circuits, 304- inductance components, 305- capacitor elements, 306- signal output parts；
Fig. 5 to Fig. 6：501- signal input parts, 502- adaptive dampings device, 503- supervisory circuits, 504- inductance components, 505- capacitor elements, 506- signal output parts；
Fig. 7 to Fig. 8：701- signal input parts, 702- adaptive dampings device, 703- supervisory circuits, 704- inductance components, 705- capacitor elements, 706- signal output parts.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, the embodiment below in conjunction with the accompanying drawings to the present invention is described in detail.It should be noted that, accompanying drawing of the present invention is using simplified form and uses non-accurately ratio, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
Embodiment 1
As shown in Fig. 2 a kind of LC filters of the present embodiment, including：The inductance component 304 being arranged between signal input part 301 and signal output part 306 and capacitor element 305, the inductance component 304 and capacitor element 305 constitute LC filter circuits, and further, the LC filters also include：The adaptive damping device 302 connected with the LC filter circuits and the supervisory circuit 303 being connected with the adaptive damping device 302.
Specifically, the supervisory circuit 303 is connected to the two ends (including positive terminal and negative pole end) of signal input part 301, further, and the supervisory circuit 303 is also connected to the two ends of the signal output part 306 simultaneously.That is, the supervisory circuit 303 in the present embodiment is mainly used in monitoring input voltage signal and output voltage signal, and according to input voltage signal and output voltage signal, the damping of the adaptive damping device 302 is adjusted in real time.
As shown in figure 3, the adaptive damping device 302 is mainly used in adjusting the damping of LC filter circuits, it can be that switchtype device and resistance 3022 are combined, and specifically, the switchtype device can select breaker 3021；Adaptive damping device 302 or the device such as JFET pipes (crystal type field-effect transistor) with variable resistor property, it is simple in construction, it is with low cost.
Fig. 4 is refer to, and combines Fig. 2, the workflow of the LC filters of the present embodiment is：
First, providing voltage allows the setting value of variable quantity, including the first setting value Vset1 and the second setting value Vset2, wherein, first setting value Vset1 is the permission maximum of signal input part voltage variety, and the second setting value Vset2 is signal input part and the permission minimum value of signal output part voltage difference.
Then, the voltage signal of 303 monitoring signal input of supervisory circuit 301 changes, when big fluctuation occurs in the voltage signal of signal input part 301, i.e., | voltage variety Vvar1 |>During the first setting value Vset1, supervisory circuit 303 controls the adaptive damping device 302 at once, its damping is set to increase immediately, LC filter circuit charge/discharge processes are made to be changed into damping charge/discharge process from non-damping charge/discharge process, make the slow rise/fall of output voltage signal, it is to avoid output signal vibrates in input voltage signal mutation process；When | signal input part voltage Vin- signal output terminal voltages Vout |<Second setting value Vset2, the damping of adaptive damping device 302 is gradually decreased as 0 again, circuit is recovered normal operating conditions.
Embodiment 2
The present embodiment and the difference of embodiment 1 are：The connected mode of supervisory circuit 503 is different.
Specifically, as shown in figure 5, the supervisory circuit 503 is respectively connecting to the same side of the signal input part 501 and signal output part 506, for direct monitoring signal output end 506 and the both end voltage of the same side of signal input part 501.
Further, the supervisory circuit 503 also needs to meet following condition：The monitoring client of inductance component 504, adaptive damping device 502 and supervisory circuit 503 must be in same one end, i.e. what the supervisory circuit 503 was monitored is the voltage signal of inductance component 504 and the place circuit of adaptive damping device 502.
The present embodiment is changed into single-ended monitoring from both-end monitoring, simplifies circuit structure relative to embodiment 1.
As shown in Figure 6：The workflow of the LC filters of the present embodiment is：
When big fluctuation occur in the signal output part 506 and the both end voltage signal of the same side of signal input part 501 that supervisory circuit 503 is monitored, i.e., | voltage variety Vvar2 |>First setting value Vset1, the damping of adaptive damping device 502 increases immediately, LC filter circuits (including inductance component 504 and capacitor element 505) charge/discharge process is set to be changed into damping charge/discharge process from non-damping charge/discharge process, make the slow rise/fall of output voltage signal, it is to avoid output signal vibrates in input voltage signal mutation process；When big fluctuation occurs again in the voltage signal that supervisory circuit 503 is monitored, i.e., | voltage variety Vvar2 |<Second setting value Vset2, the damping of adaptive damping device 502 is gradually decreased as 0 again, circuit is recovered normal operating conditions.
Embodiment 3
The present embodiment difference from Example 1 is：The voltage at the no longer two ends of monitoring signal output end 706 of supervisory circuit 703.
Specifically, as shown in fig. 7, the present embodiment is the delay time (setting time is Tset) by pre-setting to control the action time of adaptive damping device 702, and then effect same as Example 1 is realized, and structure is more simple.
As shown in figure 8, the workflow of the LC filters of the present embodiment is：
The voltage signal change of the monitoring signal input 701 of supervisory circuit 703, when big fluctuation occurs in the voltage signal of signal input part 701, i.e., | voltage variety Vvar1 |>First setting value Vset1, the damping of adaptive damping device 702 increases immediately, LC filter circuits (including inductance component 704 and capacitor element 705) charge/discharge process is set to be changed into damping charge/discharge process from non-damping charge/discharge process, make the slow rise/fall of output voltage signal, output signal in input voltage signal mutation process is avoided to vibrate, as delay time T>During setting time Tset, the damping of adaptive damping device 702 is gradually decreased as 0 again, circuit is recovered normal operating conditions.
In summary, the present invention in LC filter circuits by adding adaptive damping device and supervisory circuit, supervisory circuit is used for the voltage pulsation for detecting signal input part or signal output part, and control adaptive damping device to change its damping, so as to avoid that electricity/discharge process in big non-damping occurs in circuit, make circuit smoothes is transitioned into stable state.
Obviously, those skilled in the art can carry out various changes and modification to invention without departing from the spirit and scope of the present invention.So, if these modifications and variations of the present invention belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to including these changes and modification.
Claims (8)
1. a kind of LC filters, including：It is arranged at the inductor between signal input part and signal output part
Part and capacitor element, the inductance component and capacitor element constitute LC filter circuits, it is characterised in that also wrap
Include：The adaptive damping device connected with the LC filter circuits and the monitoring being connected with the adaptive damping device
Circuit, the supervisory circuit is according to the voltage pulsation of signal input part and/or signal output part is adjusted in real time
The circuit oscillation of electricity and shutdown transient LC filter circuits in adaptive damping device, consumption.
2. a kind of LC filters as claimed in claim 1, it is characterised in that the adaptive damping device
The resistance being connected including Switch device and with Switch device.
3. a kind of LC filters as claimed in claim 2, it is characterised in that the Switch device is
Relay.
4. a kind of LC filters as claimed in claim 1, it is characterised in that the adaptive damping device
Using crystal type field-effect transistor.
5. a kind of LC filters as claimed in claim 1, it is characterised in that the supervisory circuit and institute
The same side for stating signal input part and signal output part is connected respectively, and the same side is the variable damper
The place end of part and inductance component.
6. a kind of LC filters as claimed in claim 1, it is characterised in that the supervisory circuit and institute
The two ends for stating signal input part are connected respectively.
7. a kind of LC filters as claimed in claim 6, it is characterised in that the supervisory circuit also with
The two ends of the signal output part are connected respectively.
8. a kind of LC filters as described in claim 5 or 7, it is characterised in that the supervisory circuit
The adaptive damping device is adjusted according to the voltage difference of signal input part and signal output part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610193278.4A CN107294508A (en) | 2016-03-30 | 2016-03-30 | A kind of LC filters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610193278.4A CN107294508A (en) | 2016-03-30 | 2016-03-30 | A kind of LC filters |
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| Publication Number | Publication Date |
|---|---|
| CN107294508A true CN107294508A (en) | 2017-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610193278.4A Pending CN107294508A (en) | 2016-03-30 | 2016-03-30 | A kind of LC filters |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152582A (en) * | 2020-08-25 | 2020-12-29 | 中山市博顿光电科技有限公司 | Filter circuit of ion source driving power supply and filter parameter detection method and device thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797917A (en) * | 2004-12-28 | 2006-07-05 | 美国芯源***股份有限公司 | Active damping control for a switch mode power supply |
| US20110148200A1 (en) * | 2009-12-23 | 2011-06-23 | R2 Semiconductor, Inc. | Over Voltage Protection of a Switching Converter |
| CN103095113A (en) * | 2011-10-31 | 2013-05-08 | 鸿富锦精密工业（深圳）有限公司 | Resonant frequency regulating circuit |
| CN103219717A (en) * | 2012-01-20 | 2013-07-24 | 聚积科技股份有限公司 | Dynamic damping module and driving circuit applied by same |
-
2016
- 2016-03-30 CN CN201610193278.4A patent/CN107294508A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797917A (en) * | 2004-12-28 | 2006-07-05 | 美国芯源***股份有限公司 | Active damping control for a switch mode power supply |
| US20110148200A1 (en) * | 2009-12-23 | 2011-06-23 | R2 Semiconductor, Inc. | Over Voltage Protection of a Switching Converter |
| CN103095113A (en) * | 2011-10-31 | 2013-05-08 | 鸿富锦精密工业（深圳）有限公司 | Resonant frequency regulating circuit |
| CN103219717A (en) * | 2012-01-20 | 2013-07-24 | 聚积科技股份有限公司 | Dynamic damping module and driving circuit applied by same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152582A (en) * | 2020-08-25 | 2020-12-29 | 中山市博顿光电科技有限公司 | Filter circuit of ion source driving power supply and filter parameter detection method and device thereof |
| CN112152582B (en) * | 2020-08-25 | 2024-05-14 | 中山市博顿光电科技有限公司 | Filtering circuit of ion source driving power supply and filtering parameter detection method and device thereof |
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Application publication date: 20171024 |
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