CN201656764U - Emi noise shielding device - Google Patents
Emi noise shielding device Download PDFInfo
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- CN201656764U CN201656764U CN2010201221066U CN201020122106U CN201656764U CN 201656764 U CN201656764 U CN 201656764U CN 2010201221066 U CN2010201221066 U CN 2010201221066U CN 201020122106 U CN201020122106 U CN 201020122106U CN 201656764 U CN201656764 U CN 201656764U
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Abstract
The utility model relates to an EMI noise shielding device which is applied to a digital power control system. One end of a first resistance unit is electrically connected with one end of a second resistance unit, thus forming an input end; a differential amplification unit receives a feedback voltage (Vfb) signal with noise from the input end and carries out a first filtering operation to generate a voltage (VA) signal of a first node; a signal converting unit receives the voltage (VA) of the first node and carries out an operation of conversion of analog digital signals and a second filtering operation, thus generating a voltage (VB) signal of a second node; finally, a digital control loop unit is used for receiving the voltage (VB) signal of the second node so as to carry out judgment operation and a third filtering operation and generate a voltage (VC) signal of a third node; and the noise signal in the feedback voltage (Vfb) signals with the noise is filtered, thus achieving the purpose of not influencing the operation of digital power control systems.
Description
Technical field
The utility model relates to a kind of EMI (Electromagnetic Interference, electromagnetic interference) noise shielding device, particularly a kind of EMI noise shielding device that noise in feedback voltage (Vfb) signal is given filtering.
Background technology
Existing digital electric source control device needs output device to have the power supply of suitable current/magnitude of voltage, and charger uses, and so realizes protective circuit, the useful life of promoting electrical equipment and the benefit of energy saving.
Like this; digital PWM in the existing digital electric source control device (Pulse Width Modulation; pulse width modulation) output unit; when the complex sampling control signal that reception one modulation control cycle control unit is exported; can regulate and control a power supply switch unit according to these sampled signals is used to export suitable steady state voltage and comes for electrical equipment running; yet; these sampling control signals can carry out signal by an amplifying circuit usually and amplify before output; therefore these sampling control signals have noise; regulate and control the duty ratio (Duty Cycle) of the simulation pulse wave serial that this power supply switch unit exported according to these sampling control signals when this digital PWM output unit; or might be when regulation and control; can allow this power supply switch unit be subjected to this digital PWM output unit and transmit noise jamming in the signal; and then with the erroneous judgement becoming of the high signal (High) in this a signal low signal (Low); maybe with the low signal in this signal (Low) erroneous judgement becoming a high signal (High); cause the accuracy of the duty ratio (Duty Cycle) of the simulation pulse wave serial that this power supply switch unit exported after regulation and control to reduce; the voltage that this power supply switch unit is exported not is desired steady state voltage, and then can't make this electrical equipment normal operation.
The utility model content
The purpose of this utility model is to provide a kind of EMI noise shielding device, and this device is applied to a digital electric source control system, and described technical scheme is as follows:
A kind of EMI noise shielding device comprises:
One first resistance unit;
One second resistance unit that electrically connects with an end of this first resistance unit forms an input, is used to receive a feedback voltage signal that has a noise;
One has the differential motion amplifying unit that an input pin is used to receive this feedback voltage signal, is used to carry out one first filtering operation, to produce the voltage signal of a first node;
One has the signal conversion unit that an input pin is used to receive the voltage signal of this first node, is used to carry out an analog and digital signal conversion operations and one second filtering operation, to produce the voltage signal of a Section Point;
One has the digital control loop unit that an input pin is used to receive the voltage signal of this Section Point, is used to carry out a decision operation and one the 3rd filtering operation, to produce the voltage signal of one the 3rd node.
This differential motion amplifying unit is to receive this input by an input pin to be received the feedback voltage signal that this has noise, and the other end of another input pin and this second resistance unit electrically connects.
The voltage signal that this differential motion amplifying unit is used for the first node that will be produced exports a first node to.
The input pin of this signal conversion unit is the voltage signal that receives this first node from this first node.
Another input pin of this signal conversion unit, it is used to receive the accurate reference voltage of a low level.
The voltage signal that this signal conversion unit is used for the Section Point that will be produced exports a Section Point to.
The input pin of this digital control loop unit is the voltage signal that receives this Section Point from this Section Point.
The voltage signal that this digital control loop unit is used for the 3rd node that will be produced exports one the 3rd node to.
In a kind of EMI noise shielding device that the utility model provides, electrically connect by an end of one first resistance unit and an end of one second resistance unit, form an input, receive a feedback voltage (Vfb) number that has a noise by a differential motion amplifying unit from this input, carry out one first filtering operation, be used for voltage (VA) signal to produce a first node, receive voltage (VA) signal of this first node again by a signal conversion unit, after carrying out an analog and digital signal conversion operations and one second filtering operation, produce voltage (VB) signal of a Section Point, receive voltage (VB) signal of this Section Point at last by a digital control loop unit, carry out a decision operation and one the 3rd filtering operation, with voltage (VC) signal that produces one the 3rd node, by EMI noise shielding device the interior noise signal of feedback voltage (Vfb) signal that this has noise is given filtering, reach the purpose that can not influence this digital electric source control system running.
Description of drawings
Fig. 1 is the circuit diagram of a kind of EMI noise shielding device of providing of the utility model embodiment 1;
Fig. 2 is a kind of EMI noise shielding device wavefront and the filtered waveform schematic diagram that the utility model embodiment 1 provides.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, the utility model execution mode is described in further detail below in conjunction with accompanying drawing.
Embodiment 1
As shown in Figure 1, circuit diagram for EMI noise shielding device provided by the utility model, this EMI noise shielding device is applied to a digital electric source control system, formed by one first resistance unit 11, one second resistance unit 12, a differential motion amplifying unit 13, a signal conversion unit 14 and a digital control loop unit 15, one end of this first resistance unit 11 and an end of this second resistance unit 12 electrically connect, form an input, and receive feedback voltage (Vfb) signal that has a noise.
The input pin 131 of this differential motion amplifying unit 13 receives this and has feedback voltage (Vfb) signal of noise, another input pin 132 of this differential motion amplifying unit 13 electrically connects with the other end of this second resistance unit 12, then carry out one first filtering operation, so produce voltage (VA) signal of a first node.
The input pin 141 of this signal conversion unit 14 receives voltage (VA) the signal VA of this first node, another input pin 142 receptions one low level reference voltage Vref of this signal conversion unit 14-, carry out an analog and digital signal conversion operations and one second filtering operation, so produce voltage (VB) signal of a Section Point.
The input pin 151 of this digital control loop unit 15 receives voltage (VB) signal of this Section Point, carries out a decision operation and one the 3rd filtering operation, so produces voltage (VC) signal of one the 3rd node.
As shown in Figure 2, for before the EMI noise shielding device provided by the utility model filtering and filtered waveform schematic diagram, first waveform has feedback voltage (Vfb) the voltage of signals waveform of noise for this; Second waveform has input pin 131 receptions of feedback voltage (Vfb) signal of noise by this differential motion amplifying unit 13 for this, and after carrying out this first filtering operation, voltage (VA) voltage of signals waveform with this first node of being produced is exported to a first node A; Voltage (VA) signal that the 3rd waveform is this first node receives from this first node A by the input pin 141 of this signal conversion unit 14, and after carrying out this analog and digital signal conversion operations and this two filtering operation, voltage (VB) voltage of signals waveform with this Section Point of being produced is exported to a Section Point B; Voltage (VB) signal that the 4th waveform is this Section Point receives from this Section Point B by the input pin 151 of this digital control loop unit 15, and after carrying out this decision operation and the 3rd filtering operation, voltage (VC) voltage of signals waveform with the 3rd node that produced is exported to one the 3rd node C.
This differential motion amplifying unit 13 has this that is received in feedback voltage (Vfb) signal of noise and has little noise signal, after giving filtering by this first filtering operation earlier, produce voltage (VA) signal of this first node, carry out this analog and digital signal conversion operations by this signal conversion unit 14 again, voltage (VA) signal that makes this first node is in this analog and digital signal transfer process, if when having analog signal can't convert digital signal (promptly being 0 and 1 signal) to, then just carry out this second filtering operation, the analog signal that can't convert digital signal to gives filtering, and according to this low level reference voltage Vref-, the voltage signal of low level is also given filtering, and produce voltage (VB) signal of this Section Point, and the voltage of this Section Point (VB) signal is at last by this digital control loop unit 15, judge the width of waveform in voltage (VB) signal of this Section Point, whether be to meet required width, if have the width of waveform not meet required width in the voltage of this Section Point (VB) signal, then can be with the waveform of these width deficiencies as noise, and carry out the 3rd filtering operation and give filtering, allow the waveform that meets required width by this digital control loop unit 15, produce voltage (VC) signal of this one the 3rd node at last.
So as can be known, the EMI noise shielding device that the utility model provides has the little noise signal that is had in feedback voltage (Vfb) signal of noise with this, respectively by this differential motion amplifying unit 13, this signal conversion unit 14 and this digital control loop unit 15, carry out this first filtering operation, this analog and digital signal conversion operations, this second filtering operation, this decision operation and the 3rd filtering operation, so that this interior noise signal of feedback voltage (Vfb) signal that has noise is given filtering, reaches the purpose that can not influence this digital electric source control system running.
The above only is preferred embodiment of the present utility model, and is in order to restriction the utility model, not all within spirit of the present utility model and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1. EMI noise shielding device, it is applied to a digital electric source control system, it is characterized in that, comprising:
One first resistance unit;
One second resistance unit, an end of one end and this first resistance unit electrically connects, and forms an input, is used to receive a feedback voltage signal that has a noise;
One differential motion amplifying unit, it receives this feedback voltage signal that has noise, is used to carry out one first filtering operation, to produce the voltage signal of a first node;
One signal conversion unit, it receives this first voltage signal, is used to carry out an analog and digital signal conversion operations and one second filtering operation, to produce the voltage signal of a Section Point; And
One digital control loop unit, it receives this second voltage signal, is used to carry out a decision operation and one the 3rd filtering operation, to produce the voltage signal of one the 3rd node.
2. EMI noise shielding device as claimed in claim 1, it is characterized in that, this differential motion amplifying unit is to receive this input by an input pin to be received the feedback voltage signal that this has noise, and the other end of another input pin and this second resistance unit electrically connects.
3. EMI noise shielding device as claimed in claim 1 is characterized in that, the voltage signal that this differential motion amplifying unit is used for the first node that will be produced exports a first node to.
4. EMI noise shielding device as claimed in claim 3 is characterized in that, the input pin of this signal conversion unit is the voltage signal that receives this first node from this first node.
5. EMI noise shielding device as claimed in claim 1 is characterized in that, another input pin of this signal conversion unit, and it is used to receive the accurate reference voltage of a low level.
6. EMI noise shielding device as claimed in claim 1 is characterized in that, the voltage signal that this signal conversion unit is used for the Section Point that will be produced exports a Section Point to.
7. EMI noise shielding device as claimed in claim 6 is characterized in that, the input pin of this digital control loop unit is the voltage signal that receives this Section Point from this Section Point.
8. EMI noise shielding device as claimed in claim 1 is characterized in that, the voltage signal that this digital control loop unit is used for the 3rd node that will be produced exports one the 3rd node to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201221066U CN201656764U (en) | 2010-02-10 | 2010-02-10 | Emi noise shielding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201221066U CN201656764U (en) | 2010-02-10 | 2010-02-10 | Emi noise shielding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201656764U true CN201656764U (en) | 2010-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201221066U Expired - Fee Related CN201656764U (en) | 2010-02-10 | 2010-02-10 | Emi noise shielding device |
Country Status (1)
| Country | Link |
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| CN (1) | CN201656764U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332815A (en) * | 2011-09-14 | 2012-01-25 | 深圳航天科技创新研究院 | Method and circuit for suppressing noise caused by analog-to-digital conversion |
-
2010
- 2010-02-10 CN CN2010201221066U patent/CN201656764U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332815A (en) * | 2011-09-14 | 2012-01-25 | 深圳航天科技创新研究院 | Method and circuit for suppressing noise caused by analog-to-digital conversion |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20150210 |
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| EXPY | Termination of patent right or utility model |