CN112803935A - High-frequency current circuit - Google Patents
High-frequency current circuit Download PDFInfo
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- CN112803935A CN112803935A CN202011596112.XA CN202011596112A CN112803935A CN 112803935 A CN112803935 A CN 112803935A CN 202011596112 A CN202011596112 A CN 202011596112A CN 112803935 A CN112803935 A CN 112803935A
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- module
- filter capacitor
- circuit
- loop
- frequency current
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
- H03K17/955—Proximity switches using a capacitive detector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention provides a high-frequency current circuit, which comprises a first follow current loop and a second follow current loop, the first follow current loop is provided with a first filter capacitor module and a first switch module, the second follow current loop is provided with a second filter capacitor module and the first switch module, since the directions of the currents flowing in the first freewheel circuit and the second freewheel circuit are opposite, when the first switch module is switched on and off, currents in opposite directions can be generated in the first follow current loop and the second follow current loop, and because the first filter capacitor module and the second filter capacitor module are respectively positioned at two sides of the first switch module and at the same layer of a circuit board, therefore, the high-frequency magnetic fields generated by the two currents with opposite directions are close to each other and have opposite directions, so that the high-frequency magnetic fields can be mutually counteracted, and the aim of reducing the electromagnetic interference is fulfilled.
Description
Technical Field
The invention relates to the technical field of integrated circuit layout, in particular to a high-frequency current circuit.
Background
The existing high-frequency current circuit generally comprises a switch module and a filter module, and as the switching frequency of the switch module is continuously improved, the problem of electromagnetic interference (EMI) caused by the switch module is more and more difficult to solve. The three elements of electromagnetic interference include an interference source, an interference path and an interfered device, wherein the interfered device belongs to the category of interference resistance, so the problem of electromagnetic interference is solved, and the problem is generally considered from the aspects of interference source suppression and interference path disconnection. The method for cutting off the interference path mainly includes filtering, shielding and grounding, but the filtering or shielding method and the like usually involve a great cost.
However, from the present, designing a means for suppressing interference from the beginning of circuit design often has great limitations, for example, reducing the frequency of the switch module can greatly reduce the level of interference, but there is a contradiction between this and the high frequency and miniaturization of the high frequency current circuit; if the driving resistance of the switch module is increased, the switching speed of the switch module can be reduced, so that the high-frequency interference can be reduced, but the switching loss of the switch module is increased, and the efficiency of the circuit is reduced; adding an absorption circuit to the switch module is also an effective means to reduce interference, but also increases losses.
Disclosure of Invention
The invention aims to provide a high-frequency current circuit which can reduce the electromagnetic interference of the existing high-frequency current circuit with low cost.
In order to achieve the above object, the present invention provides a high frequency current circuit, which includes a first follow current circuit and a second follow current circuit, wherein the directions of currents flowing in the first follow current circuit and the second follow current circuit are opposite, a first filter capacitor module and a first switch module are disposed in the first follow current circuit, a second filter capacitor module and the first switch module are disposed in the second follow current circuit, the first filter capacitor module and the second filter capacitor module are respectively located at two sides of the first switch module, and the first filter capacitor module and the second filter capacitor module are located at the same layer of a circuit board.
Optionally, the frequency of the current in the high-frequency current circuit is greater than 20000 Hz.
Optionally, the first switch module is driven by a pulse width modulation signal, and the high-frequency current circuit operates in a current interruption mode.
Optionally, the capacitance capacity of the first filter capacitor module is equal to the capacitance capacity of the second filter capacitor module.
Optionally, the first filter capacitor module includes a plurality of first filter capacitors, the second filter capacitor module includes a plurality of second filter capacitors, and the number and specification of the first filter capacitors are the same as those of the second filter capacitors.
Optionally, the number of the first freewheeling circuits and the second freewheeling circuits in the high-frequency current circuit is multiple.
Optionally, the high-frequency current circuit further includes a third freewheeling circuit, a second switch module and a low-pass filtering module are disposed in the third freewheeling circuit, wherein the second switch module is further located in the first freewheeling circuit and the second freewheeling circuit, and the first switch module and the second switch module are arranged along a current flowing direction in the first freewheeling circuit or the second freewheeling circuit.
Optionally, the low-pass filtering module includes an energy storage inductor and a third filtering capacitor connected in series.
Optionally, the first switch module includes a first switch tube, and the second switch module includes a second switch tube or a diode.
Optionally, when the first switch module is turned on, the second switch module is turned off, and currents in the first freewheeling circuit and the second freewheeling circuit flow into the third freewheeling circuit; when the first switch module is turned off, the second switch module is turned on, and the first follow current loop and the second follow current loop are cut off.
The high-frequency current circuit provided by the invention comprises a first follow current loop and a second follow current loop, the first follow current loop is provided with a first filter capacitor module and a first switch module, the second follow current loop is provided with a second filter capacitor module and the first switch module, since the directions of the currents flowing in the first freewheel circuit and the second freewheel circuit are opposite, when the first switch module is switched on and off, currents in opposite directions can be generated in the first follow current loop and the second follow current loop, and because the first filter capacitor module and the second filter capacitor module are respectively positioned at two sides of the first switch module and at the same layer of a circuit board, therefore, the high-frequency magnetic fields generated by the two currents with opposite directions are close to each other and have opposite directions, so that the high-frequency magnetic fields can be mutually counteracted, and the aim of reducing the electromagnetic interference can be achieved.
Drawings
FIG. 1 is a current loop diagram of a buck circuit;
FIG. 2 is a schematic diagram of a high frequency magnetic field generated by a current of the buck circuit of FIG. 1;
FIG. 3 is a current loop diagram of a high frequency current circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a high-frequency magnetic field generated by a current of the high-frequency current circuit of FIG. 3 according to an embodiment of the present invention;
FIG. 5 is a current loop diagram of the high-frequency current circuit as a voltage-reducing circuit according to the embodiment of the present invention;
wherein the reference numerals are:
1-a first switch module; 2-a first filter capacitance module; 3-a second filter capacitance module.
Detailed Description
A high-frequency current circuit is shown in FIG. 1, which is an equivalent circuit diagram of a Buck circuit (Buck circuit), and comprises a first follow current loop Q11And a second follow current loop Q12A first filter capacitor C is arranged in the first follow current loop11A first switch tube K11And a second switch tube K12An energy storage inductor L is arranged in the second follow current loop1Second filteringCapacitor C12And a second switch tube K12. When the first switch tube K11When closed, the second switch tube K12Off, first alternating current i11Sequentially flows through the first filter capacitor C11A first switch tube K11Energy storage inductor L1And a second filter capacitor C12Then flows into the ground terminal D1, and then flows into the first filter capacitor C from the ground terminal D111(ii) a When the first switch tube K11When the switch is off, the second switch tube K12On, a second alternating current i12Sequentially flows through the energy storage inductor L1A second filter capacitor C12And the ground terminal D1, and then flows into the second switch tube K from the ground terminal D112Inductor current iL1Is passed through an energy storage inductor L1The alternating current of (1). I.e. the high-frequency current circuit has two states and passes through the first switching tube K11Switching circuit state, first alternating current i11With a second alternating current i12All are in a discontinuous state and contain abundant high-frequency components, iL1The state is continuous and the high frequency components are relatively low. First switch tube K11When frequently turning on and off, the first switch tube K11Lead parasitic inductance and first switch tube K11By said first filter capacitor C11A first switch tube K11And a second switch tube K12Formed first freewheel circuit Q11Is a high-frequency loop, and the electromagnetic interference of the high-frequency loop is far more than that of the energy storage inductor L1A second filter capacitor C12And a second switch tube K12Second free-wheeling circuit Q of the structure12Is larger, the first freewheel loop Q must be compensated11The electromagnetic interference in (1) is eliminated.
Since the high-frequency current generates a high-frequency magnetic field, the first follow current loop Q11In the first switch tube K11The switching on and off generates an alternating current i with the first current11Currents of the same direction which generate a high-frequency magnetic field E as shown in FIG. 211And a high-frequency magnetic field E11∝(f2A I)/d, wherein f is the frequency of the current, A is the first free-wheeling loop Q11I is the amplitude of the current and d is the distance from the current center, it can be seen that the frequency, amplitude of the current and the first freewheel loop Q11The larger the area of (A), the higher the frequency magnetic field E11The larger the electromagnetic interference.
In the practical design process, the reduction of the first freewheeling loop Q can be adopted11To reduce electromagnetic interference, however, the first switching tube K11And the second switch tube K12The first filter capacitor C is the device which generates heat most seriously in the whole circuit11Usually, it is not able to resist high temperature if the first filter capacitor C is used11Close to the first switching tube K11And the second switch tube K12Easily lead to said first filter capacitance C11Over-temperature failure, so the first free-wheeling loop Q is reduced11The area method of (a) has problems of overheating and electromagnetic interference collision.
Based on this, the invention provides a high-frequency current circuit, which comprises a first follow current circuit and a second follow current circuit, wherein the first follow current circuit is provided with a first filter capacitor module and a first switch module, the second follow current circuit is provided with a second filter capacitor module and a first switch module, because the directions of the currents circulating in the first follow current circuit and the second follow current circuit are opposite, when the first switch module is turned on and turned off, the currents in opposite directions can be generated in the first follow current circuit and the second follow current circuit, and because the first filter capacitor module and the second filter capacitor module are respectively positioned at two sides of the first switch module and positioned at the same layer of a circuit board, the high-frequency magnetic fields generated by the currents in opposite directions are close in distance and opposite in direction, so that the high-frequency magnetic fields can be mutually offset, thereby achieving the purpose of reducing electromagnetic interference.
The following describes in more detail embodiments of the present invention with reference to the schematic drawings. Advantages and features of the present invention will become apparent from the following description and claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
As shown in fig. 3, the present embodiment provides a high-frequency current circuit including a first freewheel loop Q21And a second follow current loop Q22Said first freewheel loop Q21And the second follow current loop Q22The direction of the current flowing in the first free-wheeling loop Q is opposite21A first filter capacitor module 2 and a first switch module 1 are arranged in the first flywheel circuit, and the second flywheel circuit Q22The first filter capacitor module 2 and the second filter capacitor module 3 are respectively located at two sides of the first switch module 1 and at the same layer of a circuit board. When the first switch module 1 is turned on, a first alternating current i21Sequentially flows through the first filter capacitor module 2 and the first switch module 1, then flows into a ground terminal D2, and then flows into the first filter capacitor module 2 from a ground terminal D2; second alternating current i22Flows through the second filter capacitor module 3 and the first switch module 1 in sequence, flows into the ground terminal D2, and then flows into the second filter capacitor module 3 from the ground terminal D2, so that the first alternating current i21With a second alternating current i22In the opposite direction.
As shown in fig. 4, when the first switch module 1 is turned on or off, the first freewheel loop Q21And the second follow current loop Q22All generate current in the first follow current loop Q21With the first alternating current i21Are in the same direction, thereby generating a first high-frequency magnetic field E21Said second freewheel circuit Q22With said second alternating current i22Are in the same direction, thereby generating a second high-frequency magnetic field E22Due to the first high-frequency magnetic field E21And the direction of the second high-frequency magnetic field E22Are opposite to each other, and the first filter capacitor module 2 and the second filter capacitor module 3 are respectively located at two sides of the first switch module 1 and at the same layer of a circuit board, that is to sayWhen the high-frequency current circuit is disposed on a circuit board, the first filter capacitor module 2 and the second filter capacitor module 3 are located on two sides of the first switch module 1 and on the same layer, for example, the circuit board is double-layered, if the first switch module 1 is on the Top surface of the circuit board, the first filter capacitor module 2 and the second filter capacitor module 3 are also on the Top surface of the circuit board, and if the first switch module 1 is on the Bottom surface of the circuit board, the first filter capacitor module 2 and the second filter capacitor module 3 are also on the Bottom surface of the circuit board. Such that the first high-frequency magnetic field E21And a second high-frequency magnetic field E22Physically very close to and in the same plane, so that the first high-frequency magnetic field E21And the second high-frequency magnetic field E22Can cancel each other out, thereby achieving the purpose of reducing electromagnetic interference.
Further, the first filter capacitor module 2 and the second filter capacitor module 3 are generally formed by one or more capacitors, and the total capacity of the first filter capacitor module 2 and the second filter capacitor module 3 may be equal to each other, so as to make the first high-frequency magnetic field E equal21And the second high-frequency magnetic field E22Can be completely offset with each other as much as possible. Optionally, the first filter capacitor module 2 includes a plurality of first filter capacitors, the second filter capacitor module 3 includes a plurality of second filter capacitors, the number of the first filter capacitors is equal to that of the second filter capacitors, and the specifications of the first filter capacitors and the second filter capacitors are the same, so that the high-frequency impedance of the first filter capacitor module 2 and the high-frequency impedance of the second filter capacitor module 3 are consistent, thereby ensuring that the first follow current loop Q is consistent21And the second follow current loop Q22The magnitude of the current generated in the first follow current loop Q is the same, and the first follow current loop Q can be counteracted to the maximum degree21And the second follow current loop Q22The electromagnetic interference generated.
Next, this embodiment will be described in detail by taking an example in which the high-frequency current circuit is a step-down circuit (Buck circuit). As shown in fig. 5, in the buck circuit, the first filter capacitor module 2 includes a first capacitorA filter capacitor C21The first switch module 1 comprises a first switch tube K21The second filter capacitor module 3 comprises a second filter capacitor C22. The high-frequency current circuit further comprises a third freewheeling circuit Q23Said third freewheel loop Q23The second switch module comprises a first switch tube K22The low-pass filtering module comprises energy storage inductors L connected in series2And a third filter capacitor C23. It is understood that the second switch module is also located in the first freewheel loop Q21And the second follow current loop Q22And the first and second switch modules follow the first freewheel loop Q21Or the second freewheel loop Q22The flow direction of the current in (1) is set. Optionally, here a second switching tube K22Diodes may also be substituted.
The first switch tube K21When turned on, the second switch tube K22Is turned off (if the diode is turned off), the first alternating current i21Sequentially flows through the first filter capacitor C21A first switch tube K21Energy storage inductor L2And a third filter capacitor C23Then flows into the ground terminal D2, and then flows into the first filter capacitor C from the ground terminal D221(ii) a Second alternating current i22Sequentially flows through the second filter capacitor C22A first switch tube K21Energy storage inductor L2And a third filter capacitor C23Then flows into the ground terminal D2, and then flows into the second filter capacitor C from the ground terminal D222That is, the third freewheel loop Q at this time23Is a first alternating current i21With a first alternating current i21Superposition of (2); the first switch tube K21When the switch is turned off, the second switch tube K22On (if diode is conducting), third AC current i23Sequentially flows through the energy storage inductor L2And a third filter capacitor C23Then flows into the ground terminal D2, and then flows into the second switch tube K from the ground terminal D222. It will be appreciated that this is due to the first switching tube K21Off, the first freewheel loop Q21And the second follow current loop Q22There should be no current flowing, but because of the first switch tube K21Lead parasitic inductance and first switch tube K21Resulting in said first freewheel loop Q21And the second follow current loop Q22In the first switch tube K21Current is generated when the first follow current loop Q is switched off and on21With the first alternating current i21In the same direction, said second freewheel loop Q22With the second alternating current i22Are in the same direction, thereby generating a first high-frequency magnetic field E as shown in fig. 421And the second high-frequency magnetic field E22The first high-frequency magnetic field E21And the second high-frequency magnetic field E22And the electromagnetic interference is reduced by mutual cancellation.
It is understood that, although the specific structure of the high-frequency current circuit provided by the present invention is described in detail by taking the Buck circuit (Buck circuit) as an example, the high-frequency current circuit is not limited to the Buck circuit (Buck circuit), but may be a high-frequency current circuit with other topologies. Moreover, this embodiment only schematically shows an equivalent circuit diagram of the high-frequency current circuit, which only includes a core device of the high-frequency current circuit, and the high-frequency current circuit may also include other devices (different structures and specific devices of the high-frequency current circuit are different), and redundant description is omitted here. Further, when the high-frequency current circuit includes a plurality of first freewheel circuits, a plurality of second freewheel circuits may be provided correspondingly.
In summary, the high-frequency current circuit provided by the embodiment of the invention includes a first freewheeling circuit and a second freewheeling circuit, the first follow current loop is provided with a first filter capacitor module and a first switch module, the second follow current loop is provided with a second filter capacitor module and the first switch module, since the directions of the currents flowing in the first freewheel circuit and the second freewheel circuit are opposite, when the first switch module is switched on and off, currents in opposite directions can be generated in the first follow current loop and the second follow current loop, and because the first filter capacitor module and the second filter capacitor module are respectively positioned at two sides of the first switch module and at the same layer of a circuit board, therefore, the high-frequency magnetic fields generated by the two currents with opposite directions can be mutually counteracted, and the aim of reducing the electromagnetic interference can be achieved.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A high-frequency current circuit is characterized by comprising a first follow current loop and a second follow current loop, wherein the directions of currents flowing in the first follow current loop and the second follow current loop are opposite, a first filter capacitor module and a first switch module are arranged in the first follow current loop, a second filter capacitor module and the first switch module are arranged in the second follow current loop, the first filter capacitor module and the second filter capacitor module are respectively positioned on two sides of the first switch module, and the first filter capacitor module and the second filter capacitor module are positioned on the same layer of a circuit board.
2. The high-frequency current circuit according to claim 1, wherein a frequency of a current in the high-frequency current circuit is greater than 20000 Hz.
3. The high-frequency current circuit according to claim 2, wherein said first switching module is driven by a pulse width modulation signal, and said high-frequency current circuit operates in a current discontinuous mode.
4. The high-frequency current circuit according to claim 1 or 2, wherein a capacitance capacity of said first filter capacitance module is equal to a capacitance capacity of said second filter capacitance module.
5. The high-frequency current circuit according to claim 4, wherein the first filter capacitor module comprises a plurality of first filter capacitors, the second filter capacitor module comprises a plurality of second filter capacitors, and the number and the specification of the first filter capacitors are the same as those of the second filter capacitors.
6. The high-frequency current circuit according to claim 1 or 2, wherein the number of the first freewheel circuits and the second freewheel circuits in the high-frequency current circuit is plural.
7. The high-frequency current circuit according to claim 1 or 2, wherein the high-frequency current circuit further comprises a third freewheeling circuit in which a second switching module and a low-pass filtering module are disposed, wherein the second switching module is further disposed in the first freewheeling circuit and the second freewheeling circuit, and the first switching module and the second switching module are disposed along a current flowing direction in the first freewheeling circuit or the second freewheeling circuit.
8. The high-frequency current circuit according to claim 7, wherein said low-pass filtering module comprises an energy-storage inductor and a third filtering capacitor connected in series.
9. The high-frequency current circuit according to claim 7, wherein the first switching module includes a first switching tube, and the second switching module includes a second switching tube or a diode.
10. The high-frequency current circuit according to claim 7, wherein when the first switching module is turned on, the second switching module is turned off, and the currents in the first freewheel loop and the second freewheel loop flow into the third freewheel loop; when the first switch module is turned off, the second switch module is turned on, and the first follow current loop and the second follow current loop are cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011596112.XA CN112803935A (en) | 2020-12-29 | 2020-12-29 | High-frequency current circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011596112.XA CN112803935A (en) | 2020-12-29 | 2020-12-29 | High-frequency current circuit |
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| CN112803935A true CN112803935A (en) | 2021-05-14 |
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| CN202011596112.XA Pending CN112803935A (en) | 2020-12-29 | 2020-12-29 | High-frequency current circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103780077A (en) * | 2012-10-19 | 2014-05-07 | 凌力尔特公司 | Switching regulator |
| CN103887996A (en) * | 2014-04-01 | 2014-06-25 | 河北科技大学 | Transformer-isolated soft commutation chopping power supply main circuit for storage battery |
| CN105242737A (en) * | 2015-11-06 | 2016-01-13 | 广州金升阳科技有限公司 | Ripple current generation method and circuit |
| TWI618343B (en) * | 2016-11-22 | 2018-03-11 | 國立高雄應用科技大學 | Three-port dc-ac power converter and control method thereof |
-
2020
- 2020-12-29 CN CN202011596112.XA patent/CN112803935A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103780077A (en) * | 2012-10-19 | 2014-05-07 | 凌力尔特公司 | Switching regulator |
| CN103887996A (en) * | 2014-04-01 | 2014-06-25 | 河北科技大学 | Transformer-isolated soft commutation chopping power supply main circuit for storage battery |
| CN105242737A (en) * | 2015-11-06 | 2016-01-13 | 广州金升阳科技有限公司 | Ripple current generation method and circuit |
| TWI618343B (en) * | 2016-11-22 | 2018-03-11 | 國立高雄應用科技大學 | Three-port dc-ac power converter and control method thereof |
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