CN1725614A - Electronic circuit with separated earthing - Google Patents
Electronic circuit with separated earthing Download PDFInfo
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- CN1725614A CN1725614A CNA2005100632657A CN200510063265A CN1725614A CN 1725614 A CN1725614 A CN 1725614A CN A2005100632657 A CNA2005100632657 A CN A2005100632657A CN 200510063265 A CN200510063265 A CN 200510063265A CN 1725614 A CN1725614 A CN 1725614A
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- 239000003990 capacitor Substances 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 7
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- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010992 reflux Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
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- 239000012467 final product Substances 0.000 description 2
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- 238000009792 diffusion process Methods 0.000 description 1
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- 238000002955 isolation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
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Abstract
An electronic circuit with isolated earthing is prepared as connecting the earthing terminal of electronic component with isolated earthing to independent horizontal plane , connecting the earthing terminal of electronic component with non -isolated earthing to unified horizontal plane and connecting independent horizontal plane to unified horizontal plane by single point . It can isolate noise between independent horizontal plane and unified horizontal plane effectively.
Description
Technical field
The present invention relates to a kind of electronic circuit, relate in particular to a kind of electronic circuit with separated earthing.
Background technology
Along with development of integrated circuits, the function of electronic device from strength to strength, manufacturing process is constantly upgrading also, adopts the chip of low-voltage, big current work to occur in a large number, promoted the extensive use of PWM (Pulse WideModulation, pulse width modulation) voltage-dropping type voltage control chip.
PWM chip and MOSFET (metallic oxide semiconductor field effecttransistor, mos field effect transistor), inductance, electric capacity etc. are together, form the PWM switching power circuit, for electronic device provides required various voltages, become the key of electronic system reliability service.The PWM switching power circuit is when providing low-voltage, big electric current, and also to the design of PCB (Printed Circuit Board, printed circuit board (PCB)), particularly butt joint ground is handled and proposed very high requirement.If the PWM chip on the pcb board is subjected to the interference from ground level, the output voltage of PWM switching power circuit can attach very noisy, and influence back level is worked by electrical chip.Cross when strong when the ground level noise, can cause the PWM chip operation unusual.
In the prior art, the ground connection of PWM switching power circuit on printed circuit board (PCB) is handled shown in figure l.The PWM switching power circuit comprises PWM chip, field effect transistor M1, field effect transistor M2 and output filter circuit, wherein, the power supply terminal VIN of PWM chip links to each other with external power source Vin, earth terminal GND is connected to the A point of ground level 110, sub-TS of first control signal output ends (Top Side) and the sub-BS of second control signal output ends (Bottom Side) are connected respectively to the grid of field effect transistor M1 and field effect transistor M2, are used to control the conducting of these two field effect transistor and end; The leakage level of field effect transistor M1 is connected to external power source Vin, and source class is connected to the leakage level of field effect transistor M2 and links to each other with an end of inductance L 1 in the output filter circuit; The source class of field effect transistor M2 is connected to the B point of ground level 110; Output filter circuit is made up of inductance L 1 and capacitor C 1, and inductance L 1 one ends are connected to the drain electrode of source electrode and the field effect transistor M2 of field effect transistor M1, and the other end links to each other with the output end vo ut of PWM switching power circuit, and is connected to the C point of ground level 110 by capacitor C 1.
During the work of PWM switching power circuit, field effect transistor M2 is in periodic conducting state, causes near the ground of B point and B point to be in quick condition, and noise is quite strong.The strong noise that the B point produces arrives the A point along ground level 110 diffusions.The PWM chip requires very high to outside operational environment sensitivity to input power supply and ground level.When the earth potential of ordering as A was subjected to intense noise and influences, the output signal of PWM chip can be attached strong noise, makes the output voltage quality of PWM switching power circuit descend.
In order to reduce the noise of PWM switching power circuit output voltage, usually adopt two kinds of methods: a kind of is to select for use the inductance of big sense value as L1 in output filter circuit, another kind is to select for use the low electric capacity of ESR (Effective Series Resistance, effective series resistance) value as C1 in output filter circuit.
No matter adopt above-mentioned which kind of method, in fact all be the function that has strengthened output filter circuit, can only slow down the noise of PWM switching power circuit output passively.Because can't reduce the interference from ground level, such method can not reduce the noise of output voltage significantly.Generally, when the noise on the ground level was 200～500mV, noise subsidiary on the output signal of PWM switching power circuit can arrive 200～500mV.Simultaneously, this method has also increased manufacturing cost.
Summary of the invention
What the present invention will solve is the problem that noise transmission disturbs the noise Sensitive Apparatus in the existing electronic circuit ground level.
Electronic circuit of the present invention comprises the electronic device of the electronic device of separated earthing, non-isolated ground connection, independent ground level and unified ground level, wherein:
The earth terminal of the electronic device of described separated earthing is connected with described independent ground level; The earth terminal of the electronic device of described non-isolated ground connection is connected with described unified ground level; Described independent ground level is connected with described unified ground level single-point.
Preferably, the width that single-point is connected between described independent ground level and the unified ground level is by the power consumption decision of the electronic device of ground connection on the described independent ground level.
Preferably, this electronic circuit is a kind of switching power circuit, and the electronic device of wherein said separated earthing comprises pulse width modulation (PWM) voltage control chip; The electronic device of described non-isolated ground connection comprises field effect transistor and filter capacitor.
Another kind of electronic circuit provided by the invention comprises the electronic device of the electronic device of separated earthing, non-isolated ground connection, independent ground level and unified ground level, wherein:
The earth terminal of the electronic device of described separated earthing is connected with described independent ground level; The earth terminal of the electronic device of described non-isolated ground connection is connected with described unified ground level; Described independent ground level is the border with the cut-off rule in described unified ground level, and is connected with described unified ground level single-point.
Preferably, the width that single-point is connected between described independent ground level and the unified ground level is by the power consumption decision of the electronic device of ground connection on the described independent ground level.
Preferably, the width of described cut-off rule is 10 mils.
Preferably, described electronic circuit is a kind of switching power circuit, and the electronic device of wherein said separated earthing comprises pulse width modulation (PWM) voltage control chip; The electronic device of described non-isolated ground connection comprises field effect transistor and filter capacitor.
The present invention is by being provided with independent ground level and adopting single-point to connect between independent ground level and unified ground level, make the noise in the ground level be difficult in independent ground level, form the backflow approach by the single-point junction, thereby can be between independent ground level and unified ground level effective insulating noise, and the present invention can not increase manufacturing cost.
The present invention also provides the printed circuit board (PCB) of dividing independent ground level and unified ground level with cut-off rule, on the basis of not revising existing pcb board layout designs, can obtain technique effect same as described above.
Description of drawings
Figure 1 shows that the ground connection schematic diagram of PWM power circuit in the prior art;
Figure 2 shows that the ground level schematic diagram of PCB among the present invention;
Figure 3 shows that the ground connection schematic diagram of first embodiment of the invention;
Figure 4 shows that the ground connection schematic diagram of second embodiment of the invention.
Embodiment
As previously mentioned, in the prior art, for a certain electronic circuit module, earth terminal of all electronic devices all is directly connected on the complete ground level on it.Like this, the noise that other noise sources produce on noise that some electronic devices are producing on the ground level when work and/or the pcb board forms noise signal and refluxes on complete ground level, other electronic devices are caused interference.
Therefore, to isolate noise signal to the electronic device of ground level noise sensitivity for a part from the PCB ground level, the method that the present invention adopts is to make noise signal avoid refluxing by the earth point of these electronic devices at the PCB ground level, thereby effectively reduces the noise of these electronic device earth points.
Among the present invention, will be divided in the ground level complete in the prior art unified ground level and at least one independent ground level, the employing single-point is connected between the independent ground level of unified ground level and each.Wherein, independent ground level is the patch plane that is partitioned into.Independent ground level is mainly used to connect the earth terminal of the electronic device of plane noise isolator, and unified ground level is used for the earth terminal of other electronic devices on the connection PCB plate.
Like this, when the noise signal that produces in the unified ground level during in the single-point junction that propagates into along unified ground level with independent ground level, because noise signal is difficult to find the backflow approach by the patch that is partitioned into, being difficult to finish signal by the such patch of independent ground level in other words refluxes, thereby noise signal only can seek the backflow approach in unified ground level, therefore only can cause extremely limited interference to independent ground level.And independent ground level by with unified ground level between single-point be connected, can make the signal flow that is connected to the electronic device on the independent ground level to unified ground level.
Therefore, the present invention keeps apart independent ground level and unified ground level to a certain extent, only connect and realize the intactly equipotential on plane by single-point, thereby the electronic device that is connected on the independent ground level is carried out separated earthing, isolated the noise on the unified ground level effectively.
Correspondingly, according to when work to the sensitivity of ground level noise and take all factors into consideration relevant with PCB layout, electronic device on the PCB is divided into the electronic device of separated earthing and the electronic device of non-isolated ground connection, accordingly its earth terminal is connected to independent ground level and unified ground level.The electronic device of each separated earthing can be connected on the independent ground level, according to actual conditions, under the condition that design requirement allows, also two or more electronic devices that need isolate can be connected on the same independent ground level, certain prerequisite is that the noise jamming between these electronic devices that need isolate is very little, or perhaps designer's acceptable.Have in the design of specific (special) requirements at some, the earth point of the electronic device of plane noise is very close isolator for example to require certain earth point that does not need the electronic device of isolating and certain needs, if do not need ground level noise that the electronic device of isolating produces in this case in the acceptable scope, the earth terminal of above-mentioned two electronic devices all can be connected on the independent ground level yet.
See also ground level schematic diagram shown in Figure 2, ground level is divided into unified ground level 210, independent ground level 221,222 and 223.An earth point 231 and 232 are respectively arranged respectively in the independent ground level 221 and 222, two earth points 233 and 234 are arranged in the independent ground level 223, wherein earth point 231,232,234 is connected respectively to the electronic device of three needs plane noise jamming isolator, earth point 233 then because of needs and uniformly plane 210 isolate and, equally also be located on the independent ground level 223 because other reasons needs and earth point 234 is close as far as possible.In this case, two electronic devices mutual noise jamming on independent ground level 223 that guarantee to be connected on earth point 233 and 234 is that the circuit design demand can be tolerated.
The present invention does not require the area size and the shape of independent ground level, as long as can satisfy the grounding requirement that is connected to the electronic device on this independent ground level.The connection width of single-point junction should be as much as possible little, but be subjected to being connected the restriction of the electronic device power consumption on this independent ground level simultaneously, and power consumption is big more, and it is wide more to connect width.When total work electric current of the electronic device on being connected this independent ground level is 1A (ampere), A/F is 10 to 20mil (mils), such width can guarantee that this electronic device has good ground connection effect, can isolate the noise from unified ground level simultaneously preferably.
The first embodiment of the present invention is an example with the PWM switching power circuit, and its schematic diagram sees also Fig. 3.In the PWM switching power circuit, the PWM chip is the electronic device of separated earthing, and field effect transistor M2 and filter capacitor C1 are the electronic device of non-isolated ground connection.Ground level on the pcb board is made up of unified ground level 310 and independent ground level 320, the A point ground connection of PWM chip in independent ground level 320, and field effect transistor M2 and filter capacitor C1 be point of the B on unified ground level 310 and C point ground connection respectively.Unified ground level 310 is connected at D point single-point with independent ground level 320.
Because the earth point B point of field effect transistor M2 is the PWM switching power circuit produces noise in ground level important source, so the D point preferably can be placed on from B point distance place far away.Simultaneously, when the filtering performance of capacitor C 1 was good, the D point may be selected near the C point, to obtain better filter effect.
When the noise on the unified ground level 310 still was 200～500mV, noise subsidiary on the output signal of PWM switching power circuit had only 20～50mV.As seen, the present invention has obtained significant effect to insulating noise on the basis that does not increase manufacturing cost.
Figure 4 shows that the ground connection schematic diagram of second embodiment of the invention, is example with the PWM switching power circuit still.In a second embodiment, not to having the layout of ground level on the pcb board in the prior art, but be the border with the cut-off rule, around the earth point A of PWM chip point, form independent ground level, the border that cut-off rule constitutes is not closed, stay a narrow opening at the D point, form independent ground level and be connected with single-point between the unified ground level.
The noise that the earth point B point of field effect transistor produces, or the noise that other noise source produces on the pcb board can not be through the earth point A point backflow of PWM chip, thus avoid of the interference of ground level noise to the PWM chip.And the PWM chip outputs to the electric current on ground, can directly send through the D point.
With identical among first embodiment, the D point preferably is selected in the position of ordering away from the earth point C of the earth point B point of field effect transistor and close filter capacitor.
The method that forms independent ground level with cut-off rule in the present embodiment can be applied to other printed circuit board (PCB).Adopt this mode not need to change existing PCB layout designs,, greatly simplified application workload of the present invention as long as increase cut-off rule around the earth point of the electronic device of plane noise isolator at needs.
Among the present invention, the width of the cut-off rule between independent ground level and the unified ground level is not had special requirement, isolation signals gets final product preferably, and recommendation is 10mil.
As seen, the present invention connects independent ground level and unified ground level by single-point, and most noises of fundamentally having isolated ground level reflux, and have prevented the interference to the electronic device of ground connection on independent ground level effectively.And the present invention generally is applicable to various pcb boards, and circuit is reliable and stable.Simultaneously, the present invention does not need extra device, and only need make amendment to the ground level of pcb board gets final product, to the not influence of whole cost of pcb board place electronic circuit.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (7)
1. an electronic circuit is characterized in that, comprises the electronic device of the electronic device of separated earthing, non-isolated ground connection, independent ground level and unified ground level, wherein:
The earth terminal of the electronic device of described separated earthing is connected with described independent ground level; The earth terminal of the electronic device of described non-isolated ground connection is connected with described unified ground level; Described independent ground level is connected with described unified ground level single-point.
2. according to the described electronic circuit of claim 1, it is characterized in that: the width that single-point is connected between described independent ground level and the unified ground level is by the power consumption decision of the electronic device of ground connection on the described independent ground level.
3. according to the described electronic circuit of claim 1, it is characterized in that: this electronic circuit is a kind of switching power circuit, and the electronic device of wherein said separated earthing comprises pulse width modulation (PWM) voltage control chip; The electronic device of described non-isolated ground connection comprises field effect transistor and filter capacitor.
4. an electronic circuit is characterized in that, comprises the electronic device of the electronic device of separated earthing, non-isolated ground connection, independent ground level and unified ground level, wherein:
The earth terminal of the electronic device of described separated earthing is connected with described independent ground level; The earth terminal of the electronic device of described non-isolated ground connection is connected with described unified ground level; Described independent ground level is the border with the cut-off rule in described unified ground level, and is connected with described unified ground level single-point.
5. according to the described electronic circuit of claim 4, it is characterized in that: the width that single-point is connected between described independent ground level and the unified ground level is by the power consumption decision of the electronic device of ground connection on the described independent ground level.
6. according to the described electronic circuit of claim 4, it is characterized in that: the width of described cut-off rule is 10 mils.
7. according to the described electronic circuit of claim 4, it is characterized in that: described electronic circuit is a kind of switching power circuit, and the electronic device of wherein said separated earthing comprises pulse width modulation (PWM) voltage control chip; The electronic device of described non-isolated ground connection comprises field effect transistor and filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100632657A CN100367644C (en) | 2005-04-07 | 2005-04-07 | Electronic circuit with separated earthing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100632657A CN100367644C (en) | 2005-04-07 | 2005-04-07 | Electronic circuit with separated earthing |
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| Publication Number | Publication Date |
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| CN1725614A true CN1725614A (en) | 2006-01-25 |
| CN100367644C CN100367644C (en) | 2008-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100632657A Expired - Fee Related CN100367644C (en) | 2005-04-07 | 2005-04-07 | Electronic circuit with separated earthing |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102736651A (en) * | 2012-06-29 | 2012-10-17 | 浪潮电子信息产业股份有限公司 | Design method for eliminating Ground noise |
| CN103001313A (en) * | 2011-09-08 | 2013-03-27 | 联正电子(深圳)有限公司 | Off-line uninterrupted power system |
| CN103178692A (en) * | 2011-12-22 | 2013-06-26 | 西门子电气传动有限公司 | Drive device of power switch device |
| CN106325161A (en) * | 2016-08-31 | 2017-01-11 | 柳州市通顺汽车部件有限责任公司 | Mechanical oscillation control device |
| WO2021120048A1 (en) * | 2019-12-18 | 2021-06-24 | 华为技术有限公司 | Chip structure and wireless communication device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4407492A1 (en) * | 1994-03-07 | 1995-09-14 | Bodenseewerk Geraetetech | Device for shielding electronic components arranged on an electronic card against external electromagnetic fields |
| CN1259812C (en) * | 2002-12-19 | 2006-06-14 | 台达电子工业股份有限公司 | Method for eliminating noise and its disturbance by printing circuit board ground wiring |
| CN2662594Y (en) * | 2003-11-27 | 2004-12-08 | 神基科技股份有限公司 | Circuit preventing electromagnetic noise signal |
| CN1281104C (en) * | 2004-08-23 | 2006-10-18 | 倚天资讯股份有限公司 | Printing circuit layout method, printing circuit board and electronic device |
-
2005
- 2005-04-07 CN CNB2005100632657A patent/CN100367644C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001313A (en) * | 2011-09-08 | 2013-03-27 | 联正电子(深圳)有限公司 | Off-line uninterrupted power system |
| CN103178692A (en) * | 2011-12-22 | 2013-06-26 | 西门子电气传动有限公司 | Drive device of power switch device |
| CN102736651A (en) * | 2012-06-29 | 2012-10-17 | 浪潮电子信息产业股份有限公司 | Design method for eliminating Ground noise |
| CN106325161A (en) * | 2016-08-31 | 2017-01-11 | 柳州市通顺汽车部件有限责任公司 | Mechanical oscillation control device |
| WO2021120048A1 (en) * | 2019-12-18 | 2021-06-24 | 华为技术有限公司 | Chip structure and wireless communication device |
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| Publication number | Publication date |
|---|---|
| CN100367644C (en) | 2008-02-06 |
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Address after: 310052 Binjiang District Changhe Road, Zhejiang, China, No. 466, No. Patentee after: NEW H3C TECHNOLOGIES Co.,Ltd. Address before: 310053 Hangzhou hi tech Industrial Development Zone, Zhejiang province science and Technology Industrial Park, No. 310 and No. six road, HUAWEI, Hangzhou production base Patentee before: HANGZHOU H3C TECHNOLOGIES Co.,Ltd. |
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