CN210181581U - Spread spectrum circuit - Google Patents
Spread spectrum circuit Download PDFInfo
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- CN210181581U CN210181581U CN201921612818.3U CN201921612818U CN210181581U CN 210181581 U CN210181581 U CN 210181581U CN 201921612818 U CN201921612818 U CN 201921612818U CN 210181581 U CN210181581 U CN 210181581U
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Abstract
The utility model relates to the field of electronic technology, in particular to spread spectrum circuit is through setting up the spread spectrum circuit to be connected two spread spectrum units in the spread spectrum circuit respectively with the clock signal and the enable signal electricity of peripheral hardware, can expand the high frequency signal on the pulsewidth of a plurality of signals, be used for alleviating high frequency spike wave band, thereby reach the high frequency signal of stretching so that EMC authentication can be better pass through. The spread spectrum circuit of this scheme design not only controls simply and the operation practicality is strong, because circuit components and parts's reduction, so the corresponding reduction of plate layer design also.
Description
Technical Field
The utility model relates to the field of electronic technology, in particular to spread spectrum circuit.
Background
The conventional LED display screen expends a lot of manpower and material resources on the authentication of Electro Magnetic Compatibility (EMC), and is also difficult to solve the problem of EMC authentication, and the design of a multi-layer (more than 4 layers) PCB board, package ground processing, signal shielding and the like are improved. In the prior art, the LED display screen authentication needs to process data signals by a high-frequency filtering circuit through a clock, an enabling circuit, a latch circuit and an input power signal, and further needs to shield the high-frequency signals from diffusing outwards through ground signals, so that not only is the signal processing difficult, but also a plurality of filtering circuits are needed to inhibit the high-frequency signals and a plurality of board layers are needed to shield the high-frequency signals. Therefore, it is particularly desirable to provide a spread spectrum circuit with simple and flexible design and control, strong operation practicability and few board layers.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to solve the technical problems that: the spread spectrum circuit is simple and flexible in design and control, high in operation practicability and few in board layer.
In order to solve the technical problem, the utility model discloses a technical scheme be:
a spread spectrum circuit comprises two spread spectrum units with the same circuit structure, wherein the two spread spectrum units are respectively and electrically connected with a peripheral clock signal and an enable signal;
the spread spectrum unit comprises a single chip microcomputer, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor and a second capacitor, and the single chip microcomputer comprises a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin and a ninth pin;
the second pin is electrically connected with one end of a first resistor, the other end of the first resistor is connected with a power supply, the third pin is respectively and electrically connected with one end of the second resistor and one end of a third resistor, the other end of the second resistor is connected with the power supply, the fourth pin is electrically connected with the other end of the third resistor, the other end of the third resistor is grounded, the fifth pin is electrically connected with one end of a seventh resistor, the other end of the seventh resistor is electrically connected with one end of an eighth resistor, the other end of the eighth resistor is grounded, the sixth pin is electrically connected with one end of a sixth resistor, the other end of the sixth resistor is grounded, the seventh pin is respectively and electrically connected with one end of the fourth resistor and one end of a fifth resistor, the other end of the fourth resistor is connected with the power supply, and the other end of the fifth resistor is electrically connected with the other end of the sixth resistor, the eighth pin is respectively electrically connected with one end of the first capacitor and one end of the second capacitor, one end of the first capacitor is connected with the power supply, the other end of the first capacitor and the other end of the second capacitor are both grounded, and the ninth pin is grounded.
Furthermore, the single chip microcomputer further comprises a first pin, the first pin of the single chip microcomputer of one of the two spread spectrum units is electrically connected with a peripheral clock signal, and the first pin of the single chip microcomputer of the other of the two spread spectrum units is electrically connected with a peripheral enable signal.
Furthermore, the device also comprises a ninth resistor, one end of the ninth resistor is electrically connected with the first pin, and the other end of the ninth resistor is electrically connected with one end of the eighth resistor.
Furthermore, the single chip microcomputer is an integrated chip of SSDI3128 AF.
Further, the capacitance values of the first capacitor and the second capacitor are the same.
The beneficial effects of the utility model reside in that:
two spread spectrum units in the spread spectrum circuit are respectively and electrically connected with a peripheral clock signal and an enable signal, so that a high-frequency signal can be spread to the pulse width of a plurality of signals to relieve a high-frequency spike wave band; the fourth resistor is connected with the power supply to form a pull-up resistor fixed at a high level, so that the signal strength after frequency spreading is enhanced; the fifth resistor and the sixth resistor are grounded respectively to form a pull-down resistor fixed at a low level, so that the interference signal can be output to the ground quickly, the interference signal can be eliminated quickly, and the extension of the high-frequency signal is achieved, so that EMC authentication can pass better; the spread spectrum circuit of this scheme design not only controls simply and the operation practicality is strong, because circuit components and parts's reduction, so the corresponding reduction of plate layer design also.
Drawings
Fig. 1 is a schematic circuit diagram of a spread spectrum circuit according to the present invention;
description of reference numerals:
r1, a first resistor; r2 second resistance; r3, third resistor; r4, fourth resistor; r5, fifth resistor; r6, sixth resistor; r7, seventh resistor; r8, eighth resistor; c1, a first capacitance; c2, a second capacitor; in1, a first pin; in2, a second pin; in3, a third pin; in4, a fourth pin; in5, a fifth pin; in6, a sixth pin; in7, a seventh pin; in8, eighth pin; in9, ninth pin.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
The utility model discloses the most crucial design lies in: by arranging the spread spectrum circuit and electrically connecting the two spread spectrum units of the spread spectrum circuit with the external enable signal and the clock signal respectively, the high-frequency signal can be spread to the pulse width of a plurality of signals.
Referring to fig. 1, the technical solution provided by the present invention is:
a spread spectrum circuit comprises two spread spectrum units with the same circuit structure, wherein the two spread spectrum units are respectively and electrically connected with a peripheral clock signal and an enable signal;
the spread spectrum unit comprises a single chip microcomputer, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor and a second capacitor, and the single chip microcomputer comprises a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin and a ninth pin;
the second pin is electrically connected with one end of a first resistor, the other end of the first resistor is connected with a power supply, the third pin is respectively and electrically connected with one end of the second resistor and one end of a third resistor, the other end of the second resistor is connected with the power supply, the fourth pin is electrically connected with the other end of the third resistor, the other end of the third resistor is grounded, the fifth pin is electrically connected with one end of a seventh resistor, the other end of the seventh resistor is electrically connected with one end of an eighth resistor, the other end of the eighth resistor is grounded, the sixth pin is electrically connected with one end of a sixth resistor, the other end of the sixth resistor is grounded, the seventh pin is respectively and electrically connected with one end of the fourth resistor and one end of a fifth resistor, the other end of the fourth resistor is connected with the power supply, and the other end of the fifth resistor is electrically connected with the other end of the sixth resistor, the eighth pin is respectively electrically connected with one end of the first capacitor and one end of the second capacitor, one end of the first capacitor is connected with the power supply, the other end of the first capacitor and the other end of the second capacitor are both grounded, and the ninth pin is grounded.
From the above description, the beneficial effects of the present invention are:
two spread spectrum units in the spread spectrum circuit are respectively and electrically connected with a peripheral clock signal and an enable signal, so that a high-frequency signal can be spread to the pulse width of a plurality of signals to relieve a high-frequency spike wave band; the fourth resistor is connected with the power supply to form a pull-up resistor fixed at a high level, so that the signal strength after frequency spreading is enhanced; the fifth resistor and the sixth resistor are grounded respectively to form a pull-down resistor fixed at a low level, so that the interference signal can be output to the ground quickly, the interference signal can be eliminated quickly, and the extension of the high-frequency signal is achieved, so that EMC authentication can pass better; the spread spectrum circuit of this scheme design not only controls simply and the operation practicality is strong, because circuit components and parts's reduction, so the corresponding reduction of plate layer design also.
The working principle of the spread spectrum circuit is as follows:
the first pin of the single chip microcomputer is a switch pin and is controlled through an inlet/outlet port of an external device, a high level is arranged in the sixth pin, the sixth pin and the seventh pin are used for adjusting the spread spectrum width, the sixth pin is in point connection with the sixth resistor, the seventh pin is electrically connected with the fourth resistor and the fifth resistor respectively, the high-frequency wave band is dispersed to a plurality of frequency bands of a spread spectrum area to reduce the peak wave band, an interference signal eliminating effect is achieved on signals after the spread spectrum is achieved, and the suppression of electromagnetic interference is achieved.
Furthermore, the single chip microcomputer further comprises a first pin, the first pin of the single chip microcomputer of one of the two spread spectrum units is electrically connected with a peripheral clock signal, and the first pin of the single chip microcomputer of the other of the two spread spectrum units is electrically connected with a peripheral enable signal.
As can be seen from the above description, the first pins of the two spread spectrum units are electrically connected to the external clock signal and the enable signal, respectively, so that the high frequency signal can be spread out to the pulse widths of the multiple signals, thereby alleviating the high frequency spike band.
Furthermore, the device also comprises a ninth resistor, one end of the ninth resistor is electrically connected with the first pin, and the other end of the ninth resistor is electrically connected with one end of the eighth resistor.
As can be seen from the above description, by providing the ninth resistor, the signal can be made interference-resistant in the spread spectrum circuit.
Further, the single chip microcomputer is an integrated chip of the SSDCI3128 AF.
As can be seen from the above description, the integrated chip of the model ssci 3128AF is adopted, the ssci 3128AF is a multifunctional 1X (multi-path) spread spectrum frequency modulator, the design of the mobile active EMI management integrated circuit of the ssci 3128AF series is unique, the use of the conventional PLLs (phase locked loop) is eliminated, the peak energy operation can be performed on the non-periodic and periodic signals, the non-periodic and periodic signals can be distributed on a wider energy band and a controlled energy band, and the electromagnetic interference (i.e. EMI) of the system is significantly reduced compared with the typical narrow-band signals generated by the oscillator and most of the frequency generators; the EMI is reduced by increasing the bandwidth of the signal, so that spread spectrum (also called spread spectrum) is achieved, and EMC certification is facilitated to pass better.
Further, the capacitance values of the first capacitor and the second capacitor are the same.
From the above description, it can be known that, when two capacitors with the same capacitance value are connected in parallel, and the total capacitance is the sum of the capacitance of the first capacitor and the capacitance of the second capacitor, the capacitance of the total capacitor is increased, and thus the electromagnetic interference can be effectively suppressed.
Referring to fig. 1, a first embodiment of the present invention is:
a spread spectrum circuit comprises two spread spectrum units with the same circuit structure, wherein the two spread spectrum units are respectively and electrically connected with a peripheral clock signal and an enable signal;
the spread spectrum unit comprises a single chip microcomputer, a first resistor R1, a second resistor (R2 with a resistance value of 4.7K), a third resistor R3, a fourth resistor (R4 with a resistance value of 100R), a fifth resistor (R5 with a resistance value of 100R), a sixth resistor (R6 with a resistance value of 100R), a seventh resistor (R7 with a resistance value of 100R), an eighth resistor R8, a first capacitor (C1 with a capacitance value of 0.1UF) and a second capacitor (C2 with a capacitance value of 0.1UF), wherein the single chip microcomputer comprises a second pin in2, a third pin in3, a fourth pin in4, a fifth pin in5, a sixth pin in6, a seventh pin in7, an eighth pin in8 and a ninth pin in 9.
The type of the single chip microcomputer is an integrated chip of SSDCI3128 AF.
The capacitance values of the first capacitor C1 and the second capacitor C2 are the same, and are both 0.1 UF.
The single chip microcomputer further comprises a first pin in1, a first pin in1 of one of the two spread spectrum units is electrically connected with a clock signal of an external device, a first pin in1 of the other of the two spread spectrum units is electrically connected with an enable signal of the external device, a second pin in2 is electrically connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with a power supply, a third pin in3 is respectively electrically connected with one end of a second resistor R2 and one end of a third resistor R3, the other end of the second resistor R2 is connected with the power supply, a fourth pin in4 is electrically connected with the other end of a third resistor R3, the other end of the third resistor R3 is grounded, a fifth pin in5 is electrically connected with one end of a seventh resistor R7, the other end of the seventh resistor R7 is electrically connected with one end of an eighth resistor R8, and the other end of the eighth resistor R8 is grounded, sixth pin in6 with the one end of sixth resistance R6 is connected electrically, the other end ground connection of sixth resistance R6, seventh pin in7 respectively with the one end of fourth resistance R4 and the one end of fifth resistance R5 are connected electrically, another termination power of fourth resistance R4, the other end of fifth resistance R5 with the other end electricity of sixth resistance R6 is connected, eighth pin in8 respectively with the one end of first electric capacity C1 and the one end electricity of second electric capacity C2 are connected, a termination power of first electric capacity C1, the other end of first electric capacity C1 and the other end of second electric capacity C2 all ground connection, ninth pin in9 ground connection.
The circuit also comprises a ninth resistor, wherein one end of the ninth resistor is electrically connected with the first pin in1, and the other end of the ninth resistor is electrically connected with one end of the eighth resistor R8.
To sum up, the utility model provides a spread spectrum circuit, through with two spread spectrum units in the spread spectrum circuit respectively with peripheral hardware clock signal and enable signal electricity connection, can expand the high frequency signal to the pulsewidth of a plurality of signals, be used for alleviating high frequency spike wave band; the fourth resistor is connected with the power supply to form a pull-up resistor fixed at a high level, so that the signal strength after frequency spreading is enhanced; the fifth resistor and the sixth resistor are grounded respectively to form a pull-down resistor fixed at a low level, so that the interference signal can be output to the ground quickly, the interference signal can be eliminated quickly, and the extension of the high-frequency signal is achieved, so that EMC authentication can pass better; the spread spectrum circuit of this scheme design not only controls simply and the operation practicality is strong, because circuit components and parts's reduction, so the corresponding reduction of plate layer design also.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (5)
1. A spread spectrum circuit is characterized by comprising two spread spectrum units with the same circuit structure, wherein the two spread spectrum units are respectively and electrically connected with a peripheral clock signal and an enable signal;
the spread spectrum unit comprises a single chip microcomputer, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor and a second capacitor, and the single chip microcomputer comprises a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin and a ninth pin;
the second pin is electrically connected with one end of a first resistor, the other end of the first resistor is connected with a power supply, the third pin is respectively and electrically connected with one end of the second resistor and one end of a third resistor, the other end of the second resistor is connected with the power supply, the fourth pin is electrically connected with the other end of the third resistor, the other end of the third resistor is grounded, the fifth pin is electrically connected with one end of a seventh resistor, the other end of the seventh resistor is electrically connected with one end of an eighth resistor, the other end of the eighth resistor is grounded, the sixth pin is electrically connected with one end of a sixth resistor, the other end of the sixth resistor is grounded, the seventh pin is respectively and electrically connected with one end of the fourth resistor and one end of a fifth resistor, the other end of the fourth resistor is connected with the power supply, and the other end of the fifth resistor is electrically connected with the other end of the sixth resistor, the eighth pin is respectively electrically connected with one end of the first capacitor and one end of the second capacitor, one end of the first capacitor is connected with the power supply, the other end of the first capacitor and the other end of the second capacitor are both grounded, and the ninth pin is grounded.
2. The spread spectrum circuit of claim 1, wherein the single chip further comprises a first pin, the first pin of the single chip of one of the two spread spectrum units is electrically connected to an external clock signal, and the first pin of the single chip of the other of the two spread spectrum units is electrically connected to an external enable signal.
3. The spread spectrum circuit of claim 2, further comprising a ninth resistor, wherein one end of the ninth resistor is electrically connected to the first pin, and the other end of the ninth resistor is electrically connected to one end of the eighth resistor.
4. The spread spectrum circuit of claim 1, wherein the single chip microcomputer is an integrated chip of the SSDCI3128 AF.
5. The spread spectrum circuit of claim 1, wherein the first capacitance and the second capacitance have the same capacitance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921612818.3U CN210181581U (en) | 2019-09-25 | 2019-09-25 | Spread spectrum circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921612818.3U CN210181581U (en) | 2019-09-25 | 2019-09-25 | Spread spectrum circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210181581U true CN210181581U (en) | 2020-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921612818.3U Active CN210181581U (en) | 2019-09-25 | 2019-09-25 | Spread spectrum circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210181581U (en) |
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2019
- 2019-09-25 CN CN201921612818.3U patent/CN210181581U/en active Active
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