CN204131369U - A kind of electronic system and voltage conversion circuit - Google Patents
A kind of electronic system and voltage conversion circuit Download PDFInfo
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- CN204131369U CN204131369U CN201420441737.2U CN201420441737U CN204131369U CN 204131369 U CN204131369 U CN 204131369U CN 201420441737 U CN201420441737 U CN 201420441737U CN 204131369 U CN204131369 U CN 204131369U
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Abstract
The utility model discloses a kind of electronic system and voltage conversion circuit, this electronic system comprises the element of multiple layout on pcb board, and in this electronic system, the element producing noise is made up of in parallel and the first element of equivalence and the second element; First element is similar with this element with the second element, and rear and this element equivalent in parallel; Be placed on the two sides of pcb board first element and the second element symmetry.Eliminate the noise because electronic component vibration produces in this electronic system of the present utility model, thus improve the noise circumstance of electronic system, there is higher comfortableness and practicality.
Description
Technical field
The utility model relates to field of electronic systems, is specifically related to a kind of electronic system and voltage conversion circuit.
Background technology
According to piezoelectric effect, the ripple of the signal of telecommunication, namely the change of voltage can cause dielectric person's movements and expression, and the ripple amplitude of the signal of telecommunication and frequency can cause dielectric ripple to have identical amplitude and frequency.
And the electronic system that current industry uses, include a lot of electronic components, such as resistance, electric capacity etc.Fig. 1 and Fig. 2, the layout of the element showing prior art on PCB and application signal in the circuit of reality, all that layout is on the pcb board of electronic system see these electronic components of Fig. 1, such layout type causes in electronic system practical work process, when the signal by large frequency and large amplitude on these elements, or due to the ripple of power supply, the vibration of these elements can be caused, the noise of vibration brings sense of discomfort when using electronic product often to user, especially in the product of the Wearable such as electronic system and wrist strap of wear-type, this noise like more obviously and had a strong impact on comfortableness and the practicality of product.
Utility model content
The utility model provides a kind of electronic system and voltage conversion circuit to solve the noise of electronic component vibration in electronic system, and then affects the problem of product comfort and practicality.
According to an aspect of the present utility model, provide a kind of electronic system, this electronic system comprises the element of multiple layout on pcb board, and in this electronic system, the element producing noise is made up of in parallel and the first element of equivalence and the second element;
First element is similar with this element with the second element, and rear and this element equivalent in parallel;
Be placed on the two sides of pcb board first element and the second element symmetry.
Alternatively, the noise element of generation noise comprises one or more in following element:
Resistance;
Electric capacity;
Inductance.
Alternatively, the two sides that the first element and the second component orientation are as one man placed on pcb board comprises:
Connect the first element and the second element with through hole, through hole divides the distance being clipped to the first element and the second element two ends the shortest.
According to an aspect of the present utility model, provide a kind of voltage conversion circuit, this circuit comprises: power management chip, metal-oxide-semiconductor Q1 and Q2, power supply 1, power supply 2, inductance L 2, L3, electric capacity C2, C3, C4, C5, resistance R2, R3 and functional module;
The high level pin of power management chip is connected with the grid of metal-oxide-semiconductor Q1; The drain electrode of metal-oxide-semiconductor Q1 is connected with described power supply 1;
The source electrode of metal-oxide-semiconductor Q1 respectively with the switching pin of power management chip, the drain electrode of inductance L 2 one end and metal-oxide-semiconductor Q2 connects;
The grid of metal-oxide-semiconductor Q2 is connected with the low level pin of power management chip, the source ground of metal-oxide-semiconductor Q2;
One end of electric capacity C2 is connected with power supply 1, the other end ground connection of electric capacity 2;
The two ends of electric capacity C2 are parallel with electric capacity C3, and the two ends of electric capacity C3 are parallel with electric capacity C4;
The other end of inductance L 2 is connected with one end of electric capacity C5;
The other end ground connection of electric capacity C5;
Inductance L 3 is in parallel with inductance L 2;
One end of electric capacity C5 is also connected with one end of resistance R2, and the other end of resistance R2 is connected with power supply 2;
Resistance R3 is in parallel with resistance R2;
Functional module is connected with power supply 2.
Alternatively, functional module comprises: signal processing chip and display module;
The power end of functional module is connected with power supply 2;
Signal processing chip comprises HDMI and LVDS interface;
Signal processing chip is used for, and receives HDMI signal by HDMI, and outputs to display module by LVDS interface after converting HDMI signal to LVDS signal and carry out output display.
Alternatively, metal-oxide-semiconductor Q1, Q2 is N-MOS pipe.
Eliminate the noise because electronic component vibration produces in this electronic system of the present utility model, thus improve the noise circumstance of electronic system, there is higher comfortableness and practicality.
Accompanying drawing explanation
Fig. 1 be prior art electronic system PCB on element put schematic diagram;
Fig. 2 is the circuit diagram of the element application in the electronic system of prior art;
Fig. 3 is the flow chart of a kind of electronic system noise-reduction method of the utility model embodiment;
Fig. 4 is the flow chart of a kind of electronic system noise-reduction method of the utility model embodiment;
Fig. 5 be the utility model embodiment electronic system PCB on element put schematic diagram;
Fig. 6 is the circuit diagram of a kind of voltage conversion circuit of the utility model embodiment;
Fig. 7 is the circuit diagram of a kind of voltage conversion circuit of the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model execution mode is described in further detail.
Core concept of the present utility model is the problem producing noise for existing electronic system electronic component vibration, and utilize noise and vibration principle, first judging the element sending noise, is generally the passive components such as resistance, electric capacity, inductance.Then, these are produced the element of noises, change two equivalent provided as one homogeneous element into, and be arranged symmetrically in the two sides of printing board PCB (Printed Circuit Board) respectively.Like this due to the consistency of two equivalent element frequency, the direction of vibration of element is also consistent.When being placed on the two sides of PCB, the direction of vibration of two equivalent elements is just in time contrary, offsets amplitude.Reach the object of the noise that the equivalent element of elimination two produces with this, thus improve comfortableness and the practicality of the use of whole electronic system.
Fig. 3 is the flow chart of a kind of electronic system noise-reduction method of the utility model embodiment, and see Fig. 3, this noise-reduction method of the present utility model comprises:
Step S310, searches the element of the generation noise determined on the pcb board of electronic system;
Step S320, for the element of each generation noise found, this element is replaced with parallel connection and the first element of equivalence and the second element, the first element is similar with this element with the second element, and rear and this element equivalent in parallel;
Step S330, is placed on the two sides of pcb board by the first element and the second element symmetry, and the noise that the first element and the second element are produced is cancelled out each other.
By above-mentioned steps, two equivalent electronic components can be produced cancelling out each other of noise, reach the object of electronic system noise reduction, and this noise-reduction method is simple, cost is low.
In an embodiment of the present utility model, after step S330, also include step S340: the noise of detected electrons system, and determine that it reaches requirement.
See Fig. 4, the workflow of concrete of the present utility model this noise-reduction method is, first differentiates that whether the electronic noise that electronic system produces is excessive according to criterion, whether affects normal use and the comfortableness of people.Secondly, judge that electronic system noise investigates by investigation noise instrument the noise that on that position, which or multiple element send after excessive.Again, noise source element is replaced to two equivalences and the element of parallel connection, be equivalent to the element before replacement when namely replacing after demand fulfillment two equivalent element in parallel, two equivalent element symmetry be placed on the two sides of PCB.Like this due to the consistency of two vibration of element frequencies and amplitude, but direction is contrary, and can cancel each other vibration noise.Finally, judge that noise meets standard.
This noise-reduction method of the present utility model mainly for be electronic component produce electronic noise, in electronic system, the vibration noise that these passive components produce is sometimes large especially, especially on the Wearable products such as wear-type electronic equipment or wrist strap, this noise like is more obvious, user also can hear, can have a strong impact on comfortableness and the practicality of product.By this noise-reduction method of the present utility model, the vibration noise of electronic component can be eliminated, thus the comfortableness that improve when electronic system uses and practicality.Concrete noise reduction meets standard, can by this decision procedure of experience of user.Due to the noise that vibration of element in electronic system causes, more serious user can hear, after method noise reduction of the present utility model, user can't hear or experiences less than noise, namely thinks to reach noise reduction standard.
Fig. 5 be the utility model embodiment electronic system PCB on element put schematic diagram, see Fig. 5, in the present embodiment, illustrate when carrying out noise reduction by method of the present utility model for resistance R1, electric capacity C1 and inductance L 1 as noise source element, the layout type of electronic component on PCB.
As shown in Figure 5, the resistance R1 producing noise is replaced to substitutional resistance R2 and R3, after R2, R3 parallel connection, is equivalent to R1; The electric capacity C1 producing noise is replaced to equivalent capacitance C2 and C3, and is equivalent to C1 after the equivalent parallel connection of C2, C3; The inductance L 1 producing noise is replaced to equivalent inductance L2 and L3, and is equivalent to L1 after L2, L3 parallel connection.
Then, the equivalent element replaced is placed on the two sides of pcb board according to the layout type of Fig. 5, can cancels out each other with the noise making two similar equivalent elements produce.Should be noted when pcb board carries out distribution element following some: the first, on PCB two sides, those do not have the blank position of cabling or element to place the equivalent element replaced.The second, consider the demands such as pcb board cutting, the putting of equivalent element of replacement will have certain safe distance with the periphery cabling of pcb board, is generally more than 20mil.3rd, connect the first element and the second element with through hole, through hole divides the distance being clipped to each element two ends the shortest; Signal between two equivalent elements converges and needs to get through hole, and through hole is beaten near the pad of element as far as possible, and element of keeping at a distance is the shortest, to eliminate the crosstalk brought that two equivalent element signal lines separate.4th, two equivalent element full symmetrics are put, and ensure that circulation sense is consistent, to reach the object of maximum elimination vibration noise.
According to the layout type of Fig. 5, test the vibration noise of electronic system after equivalent element replacement and layout complete again, can judge to meet standard, can not use to user and bring sense of discomfort.
In an embodiment of the present utility model, when equivalent element is replaced, also different according to the different replacement formulas of electronic component, the formula that electric capacity carries out replacing is: C2=C3=C1*1/2; The formula that resistance carries out replacing is: R2=R3=2*R1; The formula that inductance carries out replacing is: L2=L3=2*L1.
In other embodiments of the present utility model, according to the different qualities of different elements, the value of the equivalent element replaced should be calculated.In an embodiment of the present utility model, be using resistance R1, inductance L 1 and electric capacity C1 all as the explanation that noise source is carried out, in other embodiment of the present utility model, noise source can be any one or any two elements in three.Certainly, the type of electronic component is also not limited to resistance, inductance and electric capacity, can also be the passive component of other generation electronic noise.
Fig. 6 is the circuit diagram of a kind of voltage conversion circuit of the utility model embodiment, for the power supply circuits of functional module in wear-type product electronic system, illustrates the application of noise-reduction method of the present utility model.In the prior art, (see Fig. 2) switching power circuit realizes the conversion of voltage by high-frequency switching, but meeting coating-forming voltage ripple, causes the vibration of electric capacity C1, inductance L 1 and resistance R1 stabilized frequency, produces vibration noise while switching.
See Fig. 6, the voltage conversion circuit applying noise-reduction method of the present utility model comprises: power management chip, metal-oxide-semiconductor Q1 and Q2, power supply 1, power supply 2, inductance L 2, L3, electric capacity C2, C3, C4, C5, resistance R2, R3 and functional module; The high level pin of power management chip is connected with the grid of metal-oxide-semiconductor Q1; The drain electrode of metal-oxide-semiconductor Q1 is connected with power supply 1; The source electrode of metal-oxide-semiconductor Q1 respectively with the switching pin of power management chip, the drain electrode of inductance L 2 one end and metal-oxide-semiconductor Q2 connects; The grid of metal-oxide-semiconductor Q2 is connected with the low level pin of power management chip, the source ground of metal-oxide-semiconductor Q2; One end of electric capacity C2 is connected with power supply 1, the other end ground connection of electric capacity 2; The two ends of electric capacity C2 are parallel with electric capacity C3, and the two ends of electric capacity C3 are parallel with electric capacity C4; The other end of inductance L 2 is connected with one end of electric capacity C5; The other end ground connection of electric capacity C5; Inductance L 3 is in parallel with inductance L 2; One end of electric capacity C5 is also connected with one end of resistance R2, and the other end of resistance R2 is connected with power supply 2; Resistance R3 is in parallel with resistance R2; Functional module is connected with power supply 2.
See Fig. 6, realize in the circuit of voltage conversion function at use switching power circuit, U1 is a Switching Power Supply managing chip, the high voltage of power supply 1 is converted to the low-voltage of the power supply 2 that applicable functional module uses.Transfer principle controls rational output duty cycle, and by the high level pin of U1, low level pin and the output of pin pin are alternately opened, closed Q1 and Q2 to realize the conversion of voltage.Q1, Q2 are N-MOS pipes is switching device; C1 and C4 is input capacitance, and which couple and voltage stabilizing are removed in effect; L1 is energy-storage travelling wave tube inductance, realizes hypotensive effect.Which couple and voltage stabilizing are removed in the effect of electric capacity C5; Resistance R1 plays the effect of current limliting.
As shown in Figure 6, the component capacitance C1 of each generation noise, inductance L 1 and resistance R1 are replaced with respectively equivalent two similar elements, and respectively by every two equivalent elements in parallel layout on the two sides of PCB, so, offset the vibration noise that these two elements produce, eliminate the sense of discomfort brought by electronic component vibration noise when user uses, improve comfortableness and the practicality of the Wearable such as wear-type or wrist strap electronic product.
Fig. 7 is the circuit diagram of a kind of voltage conversion circuit of the utility model embodiment, see Fig. 7, functional module in Fig. 6 comprises: signal processing chip and display module, signal processing chip is used for connecing HDMI signal to the conversion of low-voltage differential signal LVDS from high-definition multimedia and outputs to display module (liquid crystal display LCD), makes display module to carry out screen display function.
Fig. 7 applies the noise that the vibration of element in circuit when noise-reduction method of the present utility model realizes voltage conversion function and eliminates voltage transitions causes.Particularly, the voltage high voltage of power supply 1 being converted to power applicable U2 is controlled from electrical source exchange chip U1, a chipset (System on Chip is comprised in U1, be called for short SoC), the function of SoC chip group converts the HDMI signal transacting of input to LVDS signal, adapts to the display of liquid crystal display lcd screen.Power supply 2 accesses the power pin pin of U2 to power to U2, and outside HDMI signal is input to the HDMI of U2, after process conversion, export to liquid crystal display LCD through the LVDS interface of U2.
Carry out noise reduction owing to employing method of the present utility model, when such LCD carries out output display, can not be subject to the impact of the vibration noise of electronic component, user does not have the sense of discomfort that electronic noise causes yet when using LCD.
In addition, the utility model additionally provides a kind of electronic system, and this electronic system comprises the element of multiple layout on pcb board, and the element of each generation noise in this electronic system replaces to parallel connection and the first element of equivalence and the second element; First element is similar with this element with the second element, and rear and this element equivalent in parallel; First element and the second element symmetry are placed on the two sides of pcb board.The vibration noise of the element in this electronic system can both be cancelled out each other, and improves comfortableness and user's experience of electronic system product.
The foregoing is only preferred embodiment of the present utility model, be not intended to limit protection range of the present utility model.All do within spirit of the present utility model and principle any amendment, equivalent replacement, improvement etc., be all included in protection range of the present utility model.
Claims (6)
1. an electronic system, this electronic system comprises the element of multiple layout on pcb board, it is characterized in that, in this electronic system, the element producing noise is made up of in parallel and the first element of equivalence and the second element;
Described first element is similar with this element with the second element, and rear and this element equivalent in parallel;
Described first element and the second element symmetry are placed on the two sides of pcb board.
2. electronic system according to claim 1, is characterized in that, the element of described generation noise comprise in following element one or more:
Resistance;
Electric capacity;
Inductance.
3. electronic system according to claim 1, is characterized in that, described by described first element and the second element symmetry be placed on pcb board two sides comprise:
Connect described first element and the second element with through hole, described through hole divides the distance being clipped to described first element and the second element two ends the shortest.
4. a voltage conversion circuit, is characterized in that, this circuit comprises: power management chip, metal-oxide-semiconductor Q1 and Q2, power supply 1, power supply 2, inductance L 2, L3, electric capacity C2, C3, C4, C5; Resistance R2, R3 and functional module;
The high level pin of described power management chip is connected with the grid of described metal-oxide-semiconductor Q1; The drain electrode of described metal-oxide-semiconductor Q1 is connected with described power supply 1;
The source electrode of described metal-oxide-semiconductor Q1 respectively with the switching pin of described power management chip, the drain electrode of described inductance L 2 one end and described metal-oxide-semiconductor Q2 connects;
The grid of described metal-oxide-semiconductor Q2 is connected with the low level pin of described power management chip, the source ground of metal-oxide-semiconductor Q2;
One end of described electric capacity C2 is connected with described power supply 1, the other end ground connection of described electric capacity 2;
The two ends of described electric capacity C2 are parallel with electric capacity C3, and the two ends of described electric capacity C3 are parallel with electric capacity C4;
The other end of described inductance L 2 is connected with one end of described electric capacity C5;
The other end ground connection of described electric capacity C5;
Described inductance L 3 is in parallel with described inductance L 2;
One end of described electric capacity C5 is also connected with one end of described resistance R2, and the other end of described resistance R2 is connected with described power supply 2;
Described resistance R3 is in parallel with described resistance R2;
Described functional module is connected with described power supply 2.
5. voltage conversion circuit according to claim 4, is characterized in that, described functional module comprises: signal processing chip and display module;
The power end of described functional module is connected with described power supply 2;
Described signal processing chip comprises HDMI and LVDS interface;
Described signal processing chip is used for, and receives HDMI signal by described HDMI, and outputs to display module by described LVDS interface after converting described HDMI signal to LVDS signal and carry out output display.
6. the voltage conversion circuit according to claim 4 or 5, is characterized in that, described metal-oxide-semiconductor Q1, Q2 are N-MOS pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420441737.2U CN204131369U (en) | 2014-08-06 | 2014-08-06 | A kind of electronic system and voltage conversion circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420441737.2U CN204131369U (en) | 2014-08-06 | 2014-08-06 | A kind of electronic system and voltage conversion circuit |
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| CN204131369U true CN204131369U (en) | 2015-01-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201865A (en) * | 2014-08-06 | 2014-12-10 | 青岛歌尔声学科技有限公司 | Electronic system and noise reduction method thereof and voltage switching circuit |
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2014
- 2014-08-06 CN CN201420441737.2U patent/CN204131369U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201865A (en) * | 2014-08-06 | 2014-12-10 | 青岛歌尔声学科技有限公司 | Electronic system and noise reduction method thereof and voltage switching circuit |
| CN104201865B (en) * | 2014-08-06 | 2017-02-15 | 歌尔科技有限公司 | Electronic system and noise reduction method thereof and voltage switching circuit |
| CN106787623A (en) * | 2014-08-06 | 2017-05-31 | 歌尔科技有限公司 | The noise-reduction method of electronic system, electronic system and voltage conversion circuit |
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