CN113596274A

CN113596274A - Power supply circuit of digital signal circuit and variable-frequency power supply signal generation method thereof

Info

Publication number: CN113596274A
Application number: CN202110853221.3A
Authority: CN
Inventors: 冷亚南
Original assignee: Shenzhen Lianzhou International Technology Co Ltd
Current assignee: Shenzhen Lianzhou International Technology Co Ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2021-11-02

Abstract

The invention discloses a power supply circuit of a digital signal circuit and a variable frequency power supply signal generation method thereof, wherein the circuit comprises: the device comprises a power supply control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module and a peripheral boosting module; detecting signal parameters of the low-frequency switch signal through a signal parameter detection module, generating a variable-frequency switch signal according to the signal parameters, and generating a variable-frequency power supply signal through a peripheral boosting module; the variable-frequency power supply signal output by the circuit has switching information of a low-frequency switching signal and is far away from the working frequency band of the digital signal circuit, so that switching noise can be reduced, and the performance of the digital signal circuit is improved; the power supply control module identifies the starting action of the circuit, and can control the power supply circuit to be in a silent state when the digital signal line has no voice call requirement, so that the interference of a switching signal is reduced, and the energy consumption of the power supply circuit is reduced.

Description

Power supply circuit of digital signal circuit and variable-frequency power supply signal generation method thereof

Technical Field

The invention relates to the technical field of power supply, in particular to a power supply circuit of a digital signal circuit and a variable-frequency power supply signal generation method thereof.

Background

The current commonly used voice power supply Circuit is mostly a buck-boost Circuit, the buck-boost Circuit is composed of a SLIC chip (Subscriber Line Interface Circuit chip) and peripheral triodes, the switching frequency of the buck-boost Circuit is at kilohertz level and just falls within the frequency range of DSL (Digital Subscriber Line), the power supply energy of the Circuit is higher, the switching noise of radiation is more serious, and the performance of the Digital Subscriber Line is poorer.

Disclosure of Invention

In order to solve the above problem, an embodiment of the present invention provides a power supply circuit for a digital signal line and a method for generating a variable frequency power supply signal thereof, which can generate a variable frequency power supply signal according to a low frequency switching signal, where the frequency of the variable frequency power supply signal is far away from a working frequency band of a digital subscriber line, so as to reduce a signal-to-noise ratio of the digital subscriber line and improve performance of the digital subscriber line.

The embodiment of the invention provides a power supply circuit of a digital subscriber line, which comprises: the device comprises a power supply control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module and a peripheral boosting module;

the input end of the power supply control module is used for being connected with a power supply of the power supply circuit, and the output end of the power supply control module is connected with the power supply end of the power supply circuit;

the output end of the signal control module is connected with the input end of the signal parameter detection module, and the reset control end of the signal parameter detection module is used for connecting an external reset control signal;

the first output end of the signal parameter detection module is connected with the control end of the frequency control module, the input end of the frequency control module is connected with the power supply end, the output end of the frequency control module is connected with the input end of the clock oscillation module, and the output end of the clock oscillation module is connected with the first input end of the comparator module;

the second output end of the signal parameter detection module is connected with the second input end of the comparator module;

the output end of the comparator module is connected with the control end of the peripheral boosting module, the input end of the peripheral boosting module is connected with the power supply end, and the output end of the peripheral boosting module is used for outputting power supply signals.

Preferably, the signal parameter detection module comprises a counter and a microcontroller;

the clock input end of the counter is connected with the input end of the signal parameter detection module, the n output ends of the counter are sequentially connected with the first input/output end to the nth input/output end of the microcontroller, the reset end of the counter is connected with a first power supply through a current limiting resistor, and the reset end of the counter is also connected with the reset control end of the signal parameter detection module;

the (n + 1) th input/output end of the microcontroller is connected with the input end of the signal parameter detection module; the n +2 input/output end of the microcontroller is connected with the first output end of the signal parameter detection module, the n +3 input/output end of the microcontroller is connected with the second output end of the signal parameter detection module, wherein n is greater than 0.

As a preferred mode, the frequency control module includes a switching tube unit, a first band-pass filtering unit, a second band-pass filtering unit, a first capacitor, a first switching unit, a first field effect tube, a first resistor, a second resistor, and a first bidirectional regulator tube;

the first end of the first resistor is used for being connected with a second power supply, the first end of the first resistor is also connected with the first end of the first capacitor, and the second end of the first capacitor is grounded;

the second end of the first resistor is respectively connected with the input end of the switch tube unit, the input end of the first band-pass filtering unit and the control end of the first switch unit, and the output end of the first band-pass filtering unit is grounded;

the control end of the switch tube unit is connected with the control end of the frequency control module, and the output end of the switch tube unit is grounded;

the first end of the second resistor is connected with the input end of the frequency control module, the first end of the second resistor is also connected with the source electrode of the first field effect transistor, and the second end of the second resistor is respectively connected with the grid electrode of the first field effect transistor and the input end of the first switch unit; the output end of the first switch unit is grounded;

the drain electrode of the first field effect tube is respectively connected with the output end of the frequency control module, the input end of the second band-pass filtering unit and the first end of the first bidirectional voltage-stabilizing tube, and the second end of the second band-pass filtering unit and the second end of the first bidirectional voltage-stabilizing tube are both grounded.

Preferably, the first output end of the signal parameter detection module includes m output ports, the control end of the frequency control module includes m control ports, the switch tube unit includes m control ends, the output ports are connected with the control ports in a one-to-one correspondence manner, and the control ports are connected with the control ends of the switch tube unit in a one-to-one correspondence manner;

the switch tube unit comprises m switch tubes, wherein the input ends of the switch tubes are connected with the input ends of the switch tube unit, the control ends of the switch tubes are connected with the control ends of the switch tube unit in a one-to-one correspondence mode, the output ends of the switch tubes are connected with the output ends of the switch tube unit, and m is greater than 0.

Preferably, the clock oscillation module includes a varactor diode, a first inductor, a second capacitor, a third capacitor, a second switch unit, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor;

the first end of the third resistor is used for connecting a third power supply, the first end of the third resistor is also connected with the first end of the fourth resistor, and the second end of the third resistor is respectively connected with the control end of the second switch unit, the first end of the fifth resistor, the first end of the second capacitor and the negative electrode of the varactor diode;

the input end of the second switch unit is connected with the second end of the fourth resistor, and the output end of the second switch unit is respectively connected with the first end of the sixth resistor and the first end of the third capacitor;

a second end of the fifth resistor, a second end of the sixth resistor, a second end of the third capacitor and a second end of the second capacitor are all grounded;

the negative electrode of the variable capacitance diode is further connected with the input end of the clock oscillation module, the positive electrode of the variable capacitance diode is connected with the first end of the first inductor, the second end of the first inductor is connected with the first end of the seventh resistor, and the second end of the seventh resistor is connected with the output end of the second switch unit and the output end of the clock oscillation module.

Preferably, the comparator module comprises a comparator and a second bidirectional voltage regulator tube;

the first input end of the comparator module is connected with the inverting input end of the comparator, and the second input end of the comparator module is connected with the non-inverting input end of the comparator; the output end of the comparator is grounded through the second bidirectional voltage regulator tube, and the output end of the comparator is also connected with the output end of the comparator module.

Preferably, the peripheral boost module includes a third band-pass filter unit, a second inductor, an eighth resistor, a ninth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a third switch unit, a first diode, a second diode, a third diode, and a fourth diode;

the first end of the second inductor is connected with the input end of the peripheral boosting module, the input end of the third band-pass filtering unit and the first end of the eighth resistor respectively, and the output end of the third band-pass filtering unit is grounded;

a second end of the eighth resistor is connected to a first end of the fourth capacitor, and a second end of the fourth capacitor is connected to a second end of the second inductor, a first end of the fifth capacitor, an input end of the third switching unit, an anode of the first diode, and a cathode of the second diode, respectively;

the control end of the third switch unit is connected with the control end of the peripheral boosting module;

a second end of the fifth capacitor is connected with an anode of the third diode and a cathode of the fourth diode respectively, an anode of the fourth diode is connected with a first end of the ninth resistor and a first end of the sixth capacitor respectively, a second end of the sixth capacitor is connected with a cathode of the third diode, an anode of the second diode and a first end of the seventh capacitor respectively, and a second end of the seventh capacitor is connected with an output end of the third switch unit and a cathode of the first diode respectively;

and the second end of the ninth resistor is connected with the output end of the peripheral boosting module.

Further, the power supply circuit further comprises a feedback module;

the feedback module comprises a resistor component and an eighth capacitor;

the resistor assembly is formed by connecting a plurality of resistors in parallel, a first end of the resistor assembly is connected with a first input end of the feedback module, and a first input end of the feedback module is connected with an output end of the third switch unit;

a second end of the resistor assembly is connected with a first end of the eighth capacitor, a second end of the eighth capacitor is connected with a second input end of the feedback module, and a second input end of the feedback module is connected with a first end of the ninth resistor;

the first end of the resistance component is connected with the first output end of the feedback module, the first output end of the feedback module is connected with the first feedback end of the signal control module, the second end of the resistance component is connected with the second output end of the feedback module, and the second output end of the feedback module is connected with the second feedback end of the signal control module.

Furthermore, the power control module comprises a fourth switch unit, a ninth capacitor, a fourth bandpass filtering unit, a tenth resistor, an eleventh resistor, a fifth switch unit and a switch elastic sheet;

an input end of the power control module is connected with a first end of the tenth resistor, a first end of the ninth capacitor and an input end of the fourth switching unit respectively;

a second end of the tenth resistor is connected to a second end of the ninth capacitor, a control end of the fourth switching unit, and an input end of the fifth switching unit, an output end of the fourth switching unit is connected to the second end of the ninth capacitor, an input end of the fourth bandpass filtering unit, and an output end of the power control module, respectively, and an output end of the fourth bandpass filtering unit is grounded;

the output end of the fifth switch unit is grounded, the control end of the fifth switch unit is respectively connected with the first end of the eleventh resistor and the first end of the switch elastic sheet, the second end of the switch elastic sheet is grounded, and the second end of the eleventh resistor is used for being connected with a fourth power supply;

the switch elastic sheet is installed at the interface of the telephone.

Preferably, the power supply circuit further comprises a fifth-order bandpass filtering unit;

the output end of the signal control module is connected with the input end of the signal parameter detection module, and the signal parameter detection module specifically comprises the following steps: the output end of the signal control module is connected with the input end of the fifth-order band-pass filtering unit, and the output end of the fifth-order band-pass filtering unit is connected with the input end of the signal parameter detection module.

The embodiment of the invention provides a power supply circuit of a digital subscriber line, which comprises: the device comprises a power supply control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module and a peripheral boosting module; the duty ratio of the variable frequency power supply signal output by the power supply circuit is the same as the duty ratio of the low frequency signal output by the signal control module, and the variable frequency power supply circuit comprises the switching information of the low frequency signal, so that the power supply control of the digital subscriber line is realized, the frequency of the output variable frequency power supply signal is far away from the working frequency band of the digital subscriber line, the signal-to-noise ratio of the digital subscriber line can be reduced, and the performance of the digital subscriber line is improved.

The embodiment of the present invention further provides a method for generating a variable-frequency power supply signal of a digital signal line, which is applicable to the power supply circuit of the digital subscriber line described in any of the above embodiments, and the method includes:

when the power control module detects the starting action of the circuit, the power control module supplies power to the frequency control module and the peripheral boosting module, generates and sends a starting signal to the signal control module;

the signal control module generates and sends a low-frequency switch signal to the signal parameter detection module according to the starting signal;

the signal parameter detection module detects the signal parameters of the low-frequency switching signals, generates and sends frequency control signals to the frequency control module according to the signal parameters, and generates and sends duty ratio control signals to the comparator module;

the frequency control module generates and sends a variable frequency voltage signal to the clock oscillation module according to the frequency control signal;

the clock oscillation module generates and sends a variable frequency signal to the comparator module according to the variable frequency voltage signal;

the comparator module generates and sends a variable frequency switch signal to the peripheral boosting module according to the duty ratio control signal and the variable frequency signal;

and the peripheral boosting module generates and outputs a variable-frequency power supply signal according to the variable-frequency switch signal.

As a preferred mode, the signal parameters specifically include frequency and duty ratio;

the signal parameter detection module detects a signal parameter of the low-frequency switching signal, generates and sends a frequency control signal to the frequency control module according to the signal parameter, and generates and sends a duty ratio control signal to the comparator module, and specifically includes:

the signal parameter detection module calculates the number of pulse rising edges of the low-frequency switching signal within a preset time period to obtain the frequency of the low-frequency switching signal;

the signal parameter detection module obtains high potential time by detecting a time difference between adjacent rising edges and falling edges of the low-frequency switching signal, and calculates the duty ratio of the low-frequency switching signal according to the high potential time and the frequency;

the signal parameter detection module generates and sends the frequency control signal to the frequency control module according to the frequency, and generates and sends the duty ratio control signal to the comparator module according to the duty ratio;

the signal parameter detection module also controls to detect the signal parameters of the low-frequency switch signals again through a reset control end of the signal parameter detection module.

Preferably, the frequency control signal is a plurality of potential control signals;

the frequency control module generates and sends a variable frequency voltage signal to the clock oscillation module according to the frequency control signal, and the method specifically includes:

the frequency control module receives a plurality of paths of potential control signals and converts the plurality of paths of potential control signals into a path of variable frequency voltage signal;

and the frequency control module sends the variable frequency voltage signal to the clock oscillation module.

Preferably, the clock oscillation module generates and sends a variable frequency signal to the comparator module according to the variable frequency voltage signal, and specifically includes:

the clock oscillation module receives the variable frequency voltage signal and controls the capacitance of a variable capacitance diode of the clock oscillation module through the variable frequency voltage signal;

the clock oscillation module controls the frequency of the variable frequency signal through the capacitance of the variable capacitance diode;

and the clock oscillation module sends the frequency conversion signal to the comparator module.

Preferably, the duty cycle of the variable frequency switching signal is the same as the duty cycle of the low frequency switching signal.

Preferably, the method further comprises:

feeding back current information of the peripheral boosting module to the signal control module through a feedback module of the power supply circuit;

and filtering out an out-of-band interference signal of the low-frequency switching signal through a filter module of the power supply circuit, and sending the filtered low-frequency switching signal to the signal parameter detection module.

The invention provides a power supply circuit of a digital signal circuit and a variable-frequency power supply signal generation method thereof, wherein the circuit comprises: the device comprises a power supply control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module and a peripheral boosting module; detecting signal parameters of the low-frequency switch signal through a signal parameter detection module, generating a variable-frequency switch signal according to the signal parameters, and generating a variable-frequency power supply signal through a peripheral boosting module; the variable-frequency power supply signal output by the circuit has switching information of a low-frequency switching signal and is far away from the working frequency band of the digital signal circuit, so that switching noise can be reduced, and the performance of the digital signal circuit is improved; the power supply control module identifies the starting action of the circuit, and can control the power supply circuit to be in a silent state when the digital signal line has no voice call requirement, so that the interference of a switching signal is reduced, and the energy consumption of the power supply circuit is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a power supply circuit of a digital subscriber line according to an embodiment of the present invention;

FIG. 2 is a schematic circuit diagram of a signal parameter detection module according to an embodiment of the present invention;

FIG. 3 is a schematic circuit diagram of a frequency control module according to an embodiment of the present invention;

FIG. 4 is a schematic circuit diagram of a clock oscillator module according to an embodiment of the present invention;

FIG. 5 is a schematic circuit diagram of a comparator module provided by an embodiment of the invention;

FIG. 6 is a schematic circuit diagram of a peripheral boost module and a feedback module provided by an embodiment of the present invention;

FIG. 7 is a schematic circuit diagram of a power control module provided by an embodiment of the invention;

fig. 8 is a flowchart illustrating a method for generating a variable frequency power supply signal of a digital signal line according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a power supply circuit for a digital subscriber line, and referring to fig. 1, the power supply circuit is a schematic structural diagram of the power supply circuit for the digital subscriber line provided in the embodiment of the present invention, and the power supply circuit includes: the device comprises a power supply control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module and a peripheral boosting module;

IN the specific implementation of this embodiment, the input terminal IN7 of the power control module is used to connect to the power supply Vin of the power supply circuit, and the output terminal OUT7 of the power control module is connected to the power supply terminal of the power supply circuit, and supplies power to the frequency control module and the peripheral boost module through the power supply terminal;

the output end OUT0 of the signal control module is connected with the input end IN1 of the signal parameter detection module; the reset control end RST of the signal parameter detection module is used for being connected with an external reset control signal, and the reset control signal can control the signal parameter detection module to reset.

The first output end OUT1 of the signal parameter detection module is connected with the CONTROL end CONTROL1 of the frequency CONTROL module, the input end IN2 of the frequency CONTROL module is connected with a power supply end, the output end OUT3 of the frequency CONTROL module is connected with the input end IN3 of the clock oscillation module, and the output end OUT4 of the clock oscillation module is connected with the first input end IN4 of the comparator module;

the second output terminal OUT2 of the signal parameter detection block is connected with the second input terminal IN5 of the comparator block;

the output end OUT5 of the comparator module is connected with the CONTROL end CONTROL2 of the peripheral boosting module, the input end IN6 of the peripheral boosting module is connected with the power supply end, and the output end OUT6 of the peripheral boosting module is used for outputting a power supply signal Vout.

The working principle of the power supply circuit is as follows: when the power supply control module detects the opening action of the power supply circuit, the power supply supplies power to the power supply circuit through the power supply control module;

the signal control module sends the generated low-frequency switching signal to the signal parameter detection module; the signal parameter detection module detects a frequency parameter and a duty ratio parameter of the low-frequency switching signal, generates a frequency control signal according to the frequency parameter, sends the frequency control signal to the frequency control module, generates a duty ratio control signal according to the duty ratio parameter, and sends the duty ratio control signal to the comparator module; the frequency control signal is mostly a high-low level signal, and the duty ratio control signal comprises the obtained duty ratio parameter information; the frequency control module generates and sends a variable frequency voltage signal to the clock oscillation module according to the received frequency control signal; the clock oscillation module generates and sends a variable frequency signal to the comparator module according to the received variable frequency voltage signal; the comparator module generates a variable frequency switch signal according to the received duty ratio control signal and the variable frequency signal and sends the variable frequency switch signal to the peripheral boosting module; and the peripheral boosting module generates and outputs a variable frequency power supply signal according to the received variable frequency switch signal to supply power to the digital subscriber line.

In yet another embodiment provided by the present invention, the signal parameter detection module comprises a counter and a microcontroller;

the (n + 1) th input/output end of the microcontroller is connected with the input end of the signal parameter detection module; the n +2 th input/output end of the microcontroller is connected with the first output end of the signal parameter detection module; and the n +3 input/output end of the microcontroller is connected with the second output end of the signal parameter detection module, wherein n is greater than 0.

In the specific implementation of this embodiment, refer to fig. 2, which is a schematic circuit diagram of a signal parameter detection module provided in the embodiment of the present invention, where the signal parameter detection module includes a 4-bit synchronous binary counter and a microcontroller MCU;

the CLK end of the 4-bit synchronous binary counter is connected with the input end IN1 of the signal parameter detection module, and the general input/output end GPIO1 of the MCU is also connected with the input end IN1 of the signal parameter detection module; the reset end RD of the 4-bit synchronous binary counter is connected with the reset control end RST of the signal parameter detection module, and the reset end RD of the 4-bit synchronous binary counter is also connected with a first power supply VCC1 through a current-limiting resistor Ri;

4 output ends Q1-Q4 of the 4-bit synchronous binary counter are respectively connected with general input and output ends GPIO 2-GPIO 5 of the MCU; a general input/output end GPIO6 of the MCU is connected with a first output end OUT2 of the signal parameter detection module and outputs a duty ratio control signal; and the general input and output ends GPIO 7-GPIO of the MCU are connected with a second output end OUT1 of the signal parameter detection module to output frequency control signals.

It should be noted that, in this embodiment, a preferred circuit implementation is specifically described by taking a 4-bit synchronous binary counter and an MCU as an example, in other embodiments, the counter and the microcontroller may adopt other implementations, and all of them belong to the protection scope of the present invention under the condition that the circuit operation principle is the same.

The frequency parameter of the low-frequency signal is detected through the counter, the duty ratio parameter of the low-frequency signal is detected through the microcontroller, the frequency control signal and the duty ratio control signal are output through the microcontroller, the variable-frequency power supply signal output in a variable-frequency mode can be guaranteed to keep the switching characteristic of the low-frequency signal through the parameter detection of the low-frequency signal, and the stability of the switching performance of the power supply circuit is kept.

In another embodiment provided by the present invention, the frequency control module includes a switching tube unit, a first band-pass filtering unit, a second band-pass filtering unit, a first capacitor, a first switching unit, a first field effect transistor, a first resistor, a second resistor, and a first bidirectional regulator tube;

In the specific implementation of this embodiment, referring to fig. 3, the frequency control module provided in this embodiment of the present invention is a schematic circuit diagram, where the frequency control module includes a switching tube unit, a first band-pass filtering unit U1, a second band-pass filtering unit U2, a first capacitor C1, a first switching unit Q1, a first field-effect tube T1, a first resistor R1, a second resistor R2, and a first bidirectional regulator tube W1;

it should be noted that, in the solution disclosed in the present invention, the first switch unit Q1 is a unit with a switch function, in this embodiment, the first switch unit Q1 is a triode;

it should be noted that, in the solution disclosed in the present invention, the first band-pass filtering unit U1 and the second band-pass filtering unit U2 are units having a band-pass filtering function, in this embodiment, both the first band-pass filtering unit U1 and the second band-pass filtering unit U2 are formed by connecting a low-frequency filtering capacitor and a high-frequency filtering capacitor in parallel;

a first end of the first resistor R1 is used for connecting the second power supply VCC2, a first end of the first resistor R1 is further connected with a first end of the first capacitor C1, and a second end of the first capacitor C1 is grounded;

a second end of the first resistor R1 is respectively connected with an input end of the switch tube unit, an input end of the first band-pass filtering unit U1 and a base electrode of the first switch unit Q1, and an output end of the first band-pass filtering unit U1 is grounded;

the CONTROL end of the switch tube unit is connected with the CONTROL end CONTROL1 of the frequency CONTROL module, and the output end of the switch tube unit is grounded;

a first end of the second resistor R2 is connected to the input terminal IN2 of the frequency control module, a first end of the second resistor R2 is further connected to the source of the first fet T1, and a second end of the second resistor R2 is connected to the gate of the first fet T1 and the collector of the first switch unit Q1, respectively; the emitter of the first switching unit Q1 is grounded;

the drain of the first field effect transistor T1 is connected with the output terminal OUT3 of the frequency control module, the input terminal of the second band-pass filtering unit U2 is connected with the first terminal of the first bidirectional regulator tube W1, and the second terminal of the second band-pass filtering unit U2 and the second terminal of the first bidirectional regulator tube W1 are both grounded.

It should be noted that the emitter of the first switching unit Q1 may be grounded through a current limiting resistor, so as to avoid the switch tube from being damaged by excessive current.

The received frequency control signal is converted into a potential signal through the switch tube unit, and is converted into a specific frequency control voltage signal through the triode unit and the field effect tube to be output.

In another embodiment provided by the present invention, the first output end of the signal parameter detection module includes m output ports, the control end of the frequency control module includes m control ports, the switch tube unit includes m control ends, the output ports are connected to the control ports in a one-to-one correspondence manner, and the control ports are connected to the control ends of the switch tube unit in a one-to-one correspondence manner;

the switch tube unit comprises m switch tubes, wherein the input end of each switch tube is connected with the input end of the switch tube unit, the control end of each switch tube is connected with the control end of the switch tube unit in a one-to-one correspondence mode, and the output end of each switch tube is connected with the output end of the switch tube unit.

In the specific implementation of this embodiment, referring to fig. 3, the switching tube unit of the frequency control module includes m switching tubes, which are respectively K1-Km;

it should be noted that the switching tubes in the switching tube unit in this embodiment are illustrated by taking triodes as examples, and in other embodiments, other switching tubes may be adopted in the switching tube unit;

the first output end OUT1 of the signal parameter detection module comprises m output ports, the control end of the frequency control module comprises m control ports, the switch tube unit comprises m control ends, the output ports are connected with the control ports in a one-to-one correspondence manner, and the control ports are connected with the control ends of the switch tube unit in a one-to-one correspondence manner; wherein m >0

The collector of any switching tube is connected with the input end of the switching tube unit, the base of each switching tube is correspondingly connected with each control end of the switching tube unit, and the emitter of any switching tube is connected with the output end of the switching tube unit;

it should be noted that the base, emitter and collector of each switching tube in the switching tube unit can be connected with a current-limiting resistor, so as to avoid the damage of the switching tube due to excessive current;

through adopting a plurality of switch tubes, can be to the multichannel signal conversion of signal parameter detection module output, the frequency control signal of signal parameter detection module output is multichannel potential signal, and potential signal quantity increases, and the switch tube quantity that the switch tube unit adopted corresponds with it, can improve the accuracy of frequency conversion voltage signal, realizes the accurate control to frequency conversion signal frequency.

In another embodiment provided by the present invention, the clock oscillation module includes a varactor diode, a first inductor, a second capacitor, a third capacitor, a second switch unit, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor;

the negative electrode of the variable capacitance diode is further connected with the input end of the clock oscillation module, the positive electrode of the variable capacitance diode is connected with the first end of the first inductor, the second end of the first inductor is connected with the first end of the seventh resistor, and the second end of the seventh resistor is connected with the input end of the second switch unit and the output end of the clock oscillation module.

In specific implementation of this embodiment, referring to fig. 4, the clock oscillation module provided in this embodiment of the present invention is a schematic circuit diagram of the clock oscillation module, where the clock oscillation module includes a varactor VD1, a first inductor L1, a second capacitor C2, a third capacitor C3, a second switch unit Q2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7;

in the present invention, the second switching unit Q2 is a unit having a switching function, and may be a switching unit formed by a plurality of transistors; in this embodiment, the second switching unit Q2 is specifically a transistor;

a first end of the third resistor R3 is used for connecting a third power supply VCC3, a first end of the third resistor R3 is further connected with a first end of the fourth resistor R4, and a second end of the third resistor R3 is respectively connected with a base of the second switch unit Q2, a first end of the fifth resistor R5, a first end of the second capacitor C2, and a negative electrode of the varactor VD 1;

a collector of the second switching unit Q2 is connected to a second end of the fourth resistor R4, and an emitter of the second switching unit Q2 is connected to a first end of the sixth resistor R6 and a first end of the third capacitor C3, respectively;

the second end of the fifth resistor R5, the second end of the sixth resistor R6, the second end of the third capacitor C3 and the second end of the second capacitor C2 are all grounded;

the cathode of the varactor VD1 is further connected to the input terminal IN3 of the clock oscillation module, the anode of the varactor VD1 is connected to the first terminal of the first inductor L1, the second terminal of the first inductor L1 is connected to the first terminal of the seventh resistor R7, and the second terminal of the seventh resistor R7 is connected to the emitter of the second switch unit Q2 and the output terminal OUT4 of the clock oscillation module.

The variable capacitance diode adjusts the capacitance according to the variable frequency voltage signal, and controls the frequency of the frequency signal output by the clock oscillation module through the capacitance change, so that the output of the variable frequency signal is realized.

In yet another embodiment provided by the present invention, the comparator module includes a comparator and a second bidirectional regulator tube;

In specific implementation of this embodiment, referring to fig. 5, a schematic circuit diagram of a comparator module according to an embodiment of the present invention is shown, where the comparator module includes a comparator a and a second bidirectional regulator tube W2;

the first input IN4 of the comparator block is connected to the inverting input of the comparator a, and the second input IN5 of the comparator block is connected to the non-inverting input of the comparator a; the output end of the comparator A is grounded through a second bidirectional voltage regulator tube W2, and is also connected with the output end OUT5 of the comparator module;

it should be noted that, in this embodiment, both the two input ends and the output end of the comparator a may be connected to a current-limiting resistor;

the frequency conversion signal and the duty ratio control signal are input into the comparator together, the comparator can output a frequency conversion switch signal according to the input signal, and the frequency conversion switch signal comprises the duty ratio and the switch information of the low-frequency signal.

In another embodiment provided by the present invention, the peripheral boosting module includes a third band-pass filtering unit, a second inductor, an eighth resistor, a ninth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a third switching unit, a first diode, a second diode, a third diode, and a fourth diode;

In specific implementation of this embodiment, refer to fig. 6, which is a schematic circuit diagram of a peripheral boost module and a feedback module according to an embodiment of the present invention; the peripheral boosting module comprises a third band-pass filter unit U3, a second inductor L2, an eighth resistor R8, a ninth resistor R9, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a third switching unit Q3, a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4;

it should be noted that, in the solution disclosed in the present invention, the third band-pass filtering unit U3 is a unit having a band-pass filtering function, and in this embodiment, the third band-pass filtering unit U3 is formed by connecting a low-frequency filtering capacitor and a high-frequency filtering capacitor in parallel;

it should be noted that the third switching unit Q3 is a circuit with a switching function, and has a control terminal, an input terminal, and an output terminal, in this embodiment, the third switching unit Q3 is a MOS transistor, and in other embodiments, the third switching unit Q3 may be implemented in other optional ways.

A first end of the second inductor L2 is connected to an input terminal IN6 of the peripheral boost module, an input terminal of the third band-pass filter unit U3, and a first end of the eighth resistor R8, respectively, and an output terminal of the third band-pass filter unit U3 is grounded;

a second end of the eighth resistor R8 is connected to a first end of the fourth capacitor C4, and a second end of the fourth capacitor C4 is connected to a second end of the second inductor L2, a first end of the fifth capacitor R5, a source of the third switching unit Q3, an anode of the first diode D1, and a cathode of the second diode D2, respectively;

the gate of the third switching unit Q3 is connected to the CONTROL terminal CONTROL of the peripheral boost module;

a second end of the fifth capacitor C5 is connected to an anode of the third diode D3 and a cathode of the fourth diode D4, respectively, an anode of the fourth diode D4 is connected to a first end of the ninth resistor R9 and a first end of the sixth capacitor C6, respectively, a second end of the sixth capacitor C6 is connected to a cathode of the third diode D3, an anode of the second diode D2 and a first end of the seventh capacitor C7, respectively, and a second end of the seventh capacitor C7 is connected to a drain of the third switching unit Q3 and a cathode of the first diode D1, respectively;

the second end of the ninth resistor R9 is connected to the output terminal OUT6 of the peripheral boost module.

It should be noted that a diode may be connected between the source and the drain of the third switching unit Q3, the anode of the diode is connected to the drain of the third switching unit Q3, and the cathode of the diode is connected to the source of the third switching unit Q3, so as to prevent the reverse current from damaging the third switching unit Q3.

The peripheral boosting module is connected with the variable frequency switch signal output by the comparator module, and converts the low-voltage signal of the variable frequency switch signal into a high-voltage state for supplying power to the digital subscriber line.

In yet another embodiment provided by the present invention, the power supply circuit further comprises a feedback module;

the feedback module comprises a resistor component and an eighth capacitor;

In the specific implementation of this embodiment, referring to fig. 6, the power supply circuit further includes a feedback module;

the feedback module comprises a resistor component R and an eighth capacitor C8;

the resistor component R is formed by connecting a plurality of resistors in parallel, so that a small resistor can pass larger current at the same time; in the drawings of the present embodiment, the number of the parallel resistors in the resistor assembly R is five, and in other embodiments, other preferred embodiments are possible.

A first terminal of the resistance component R is connected to the drain of the third switching unit Q3;

the second end of the resistor assembly R is connected with the first end of an eighth capacitor C8, and the second end of an eighth capacitor C8 is connected with the first end of a ninth resistor R9;

the first end of the resistor component R is connected with a first output end F1 of the feedback module, the first output end of the feedback module is connected with a first feedback end of the signal control module, the second end of the resistor component R is connected with a second output end F2 of the feedback module, and the second output end of the feedback module is connected with a second feedback end of the signal control module.

The current and voltage information output by the peripheral boosting module is fed back through the feedback module, and the feedback precision is higher by adopting the resistance component for feedback.

In another embodiment provided by the present invention, the power control module includes a fourth switch unit, a ninth capacitor, a fourth bandpass filtering unit, a tenth resistor, an eleventh resistor, a fifth switch unit, and a switch elastic sheet;

an input end of the power control module is connected with a first end of the tenth resistor, a first end of the ninth capacitor and an input end of the fourth switch unit respectively;

the switch elastic sheet is installed at the interface of the telephone.

In specific implementation of this embodiment, referring to fig. 7, the power control module according to the embodiment of the present invention is a schematic circuit diagram, where the power control module includes a fourth switch unit Q4, a ninth capacitor C9, a fourth bandpass filter unit U4, a tenth resistor R10, an eleventh resistor R11, a fifth switch unit Q5, and a switch elastic sheet S1;

it should be noted that, in the solution disclosed in the present invention, the fourth switching unit Q4 is a unit having a switching function, and in this embodiment, the fourth switching unit Q4 is a MOS transistor;

it should be noted that, in the solution disclosed in the present invention, the fifth switching unit Q5 is a unit with a switching function, in this embodiment, the fifth switching unit Q5 is a triode;

in the solution disclosed in the present invention, the fourth bandpass filtering unit U4 is a unit having a bandpass filtering function, and in this embodiment, the fourth bandpass filtering unit U4 is formed by connecting a low-frequency filtering capacitor and a high-frequency filtering capacitor in parallel;

an input end IN7 of the power control module is respectively connected with a first end of a tenth resistor R10, a first end of a ninth capacitor C9 and an input end of a fourth switching unit Q4;

a second end of the tenth resistor R10 is connected to a second end of the ninth capacitor C9, a gate of the fourth switching unit Q4, and a collector of the fifth switching unit Q5, respectively, a source of the fourth switching unit Q4 is connected to a second end of the ninth capacitor C9, an input end of the fourth bandpass filtering unit U4, and an output end OUT7 of the power control module, respectively, and an output end of the fourth bandpass filtering unit U4 is grounded;

the emitter of the fifth switch unit Q5 is grounded, the base of the fifth switch unit Q5 is connected to the first end of the eleventh resistor R11 and the first end of the switch elastic piece S1, the second end of the switch elastic piece S1 is grounded, the second end of the eleventh resistor R11 is used for connecting the fourth power supply VCC4, and the switch elastic piece S1 is installed at the phone interface.

In a default state, the switch elastic sheet S1 is closed, when the phone is inserted into the phone interface, the switch elastic sheet S1 is opened, the fifth switch unit Q5 is turned on, the fourth switch unit Q4 is turned on, and the input power supply signal is output to the power supply terminal.

Through the power control module, when the digital subscriber line has no voice call requirement, the power supply to the power end of the power supply circuit is disconnected, the interference of the power supply circuit to the digital subscriber line is reduced, and the energy consumption can be reduced.

In another embodiment provided by the present invention, the power supply circuit further includes a fifth-order bandpass filtering unit;

In a specific implementation of this embodiment, the fifth-order bandpass filtering unit may be a fifth-order bandpass filter, and the fifth-order bandpass filter is connected between the signal control module and the signal parameter detection module, and is configured to filter out-of-band interference information of the low-frequency signal sent by the signal control module, so as to improve the quality of the low-frequency signal.

An embodiment of the present invention further provides a method for generating a frequency-conversion power-supply signal of a digital signal line, and referring to fig. 8, the method is a schematic flow chart of the method for generating a frequency-conversion power-supply signal of a digital signal line according to the embodiment of the present invention, and the method is applicable to any one of the power-supply circuits of the digital subscriber line described in the above embodiments, and the method includes steps S101 to S107:

s101, when the power control module detects the starting action of a circuit, the power control module supplies power to the frequency control module and the peripheral boosting module, generates and sends a starting signal to the signal control module;

s102, the signal control module generates and sends a low-frequency switch signal to the signal parameter detection module according to the starting signal;

s103, the signal parameter detection module detects the signal parameter of the low-frequency switch signal, generates and sends a frequency control signal to the frequency control module according to the signal parameter, and generates and sends a duty ratio control signal to the comparator module;

s104, the frequency control module generates and sends a variable frequency voltage signal to the clock oscillation module according to the frequency control signal;

s105, the clock oscillation module generates and sends a variable frequency signal to the comparator module according to the variable frequency voltage signal;

s106, the comparator module generates and sends a variable frequency switch signal to the peripheral boosting module according to the duty ratio control signal and the variable frequency signal;

and S107, the peripheral boosting module generates and outputs a variable-frequency power supply signal according to the variable-frequency switch signal.

When the embodiment is implemented specifically, when the power control module detects a starting action of a circuit, specifically, the starting action of accessing the phone to the RJ11 port can be recognized through a dome switch installed at the phone port, the power control module is turned on to supply power to the frequency control module and the peripheral boost module, and generates and sends a starting signal to the signal control module;

the signal control module generates and sends a low-frequency switch signal to the signal parameter detection module according to the starting signal; the low-frequency switching signal comprises switching information of a digital signal circuit;

detecting the signal parameters of the low-frequency switching signals through a signal parameter detection module, generating frequency control signals to a frequency control module according to the detected signal parameters, and changing the frequency of the low-frequency switching signals through the frequency control signals; generating a duty ratio control signal to a comparator module, and storing the switching information of the low-frequency switching signal through the duty ratio control signal;

the frequency control module generates a variable frequency voltage signal to the clock oscillation module according to the frequency control signal, wherein the variable frequency voltage signal comprises variable frequency information;

the clock oscillation module generates and sends a frequency conversion signal to the comparator module according to the frequency conversion voltage signal, the frequency of the frequency conversion signal is higher than that of the low-frequency switching signal, specifically, the frequency conversion signal can be a frequency multiplication signal of the low-frequency switching signal, and the frequency of the frequency conversion signal is far away from the working frequency band of the digital signal circuit, so that the switch noise of the power supply circuit can be prevented from influencing the performance of the digital signal circuit.

The variable-frequency power supply signal is used for supplying power to the digital signal circuit, and the variable-frequency power supply signal is far away from the working frequency band of the digital signal circuit, so that the influence of the power supply signal on the digital signal circuit is reduced;

the embodiment of the invention provides a method for generating a variable-frequency power supply signal of a digital signal circuit, which is characterized in that when a power supply control module detects the starting action of the circuit, power is supplied to a frequency control module and a peripheral boosting module; detecting signal parameters of the low-frequency switching signals generated by the signal control module through a signal parameter detection module, and generating frequency control signals and duty ratio control signals according to the signal parameters; the frequency control module and the clock oscillation module generate variable frequency signals according to the frequency control signals, and the comparator module generates variable frequency switch signals according to the duty ratio control signals and the variable frequency signals; the peripheral boosting module generates and outputs a variable-frequency power supply signal according to the variable-frequency switch signal; the signal parameter detection module detects parameters of the low-frequency switch signal, generates a variable-frequency switch signal according to the detected parameters, and outputs a variable-frequency power supply signal to supply power to the digital signal circuit through the peripheral boosting module, wherein the variable-frequency power supply signal has switching information of the low-frequency switch signal and is far away from a working frequency band of the digital signal circuit, so that switching noise can be reduced, and the performance of the digital signal circuit can be improved; the power supply control module identifies the starting action of the circuit, controls the power supply to the frequency control module and the peripheral boosting module, can control a power supply circuit to be in a silent state when the digital signal circuit has no voice call requirement, and cannot generate an interference signal at the moment; when a user has a voice call demand, the power supply circuit supplies power to the corresponding module of the power supply circuit, so that the interference of a switching signal is reduced, and the energy consumption of the power supply circuit is reduced;

in a further embodiment provided by the present invention, the signal parameters specifically include frequency and duty cycle;

step S103 specifically includes:

In this embodiment, the signal parameters include the frequency and duty cycle of the low-frequency switching signal;

the frequency is calculated by a counter of the signal parameter detection module, and the duty ratio signal is detected by a microcontroller of the signal parameter detection module, specifically:

the signal parameter detection module detects the number of pulse rising edges of the low-frequency switching signal within 1s through a counter to obtain the frequency of the low-frequency switching signal;

the signal parameter detection module detects a time difference between adjacent rising edges and falling edges of the low-frequency switching signal through a microcontroller to obtain high potential time, calculates the cycle time of the low-frequency switching signal through frequency, and calculates the duty ratio of the low-frequency switching signal according to the high potential time and the cycle time;

The frequency and the duty ratio of the low-frequency switching signal are detected through the signal parameter detection module, the switching information on the low-frequency switching signal can be detected, the variable-frequency power supply signal generated according to the duty ratio control signal has the switching information of the low-frequency switching signal, the working frequency band of the digital signal circuit is far away, the switching function of the digital signal circuit can be achieved, and the interference of switching noise is avoided.

In another embodiment of the present invention, the frequency control signal is a plurality of potential control signals;

the step S104 specifically includes:

In the specific implementation of this embodiment, the frequency control signal is a plurality of potential control signals, the plurality of circuit control signals include frequency information, specifically, a binary potential signal, and the frequency information is represented by high and low levels;

the frequency control module receives a plurality of paths of potential control signals and converts the plurality of paths of circuit control signals into a path of variable frequency voltage signal;

In another embodiment provided by the present invention, step S105 specifically includes:

In this embodiment, when implemented specifically, the clock oscillation module receives the variable frequency voltage signal, and changes a capacitance value of a varactor diode of the clock oscillation module according to a voltage value of the variable frequency voltage signal;

the clock oscillation module changes the frequency of the variable frequency signal through the capacitance value change of a capacitance control oscillation circuit of the variable capacitance diode;

The frequency control module converts a plurality of paths of potential control signals output by the signal parameter detection module into a path of variable frequency voltage signal, and controls the clock oscillation module to output the variable frequency signal, the variable frequency signal with the frequency far away from the digital signal circuit is output, and the interference of switching noise generated by the switching signal to the digital signal circuit is reduced.

In another embodiment of the present invention, the duty cycle of the variable frequency switching signal is the same as the duty cycle of the low frequency switching signal.

In a specific implementation of this embodiment, the comparator module generates the variable frequency switching signal according to the variable frequency signal and the duty ratio control signal, has a duty ratio identical to that of the low frequency switching signal, has the switching information of the low frequency switching signal generated by the signal control module, and can implement a switching function of supplying power to the digital signal line.

In another embodiment provided by the present invention, the method further comprises:

In this embodiment, the power supply circuit further includes a feedback module and a filter module;

feeding back current information of the peripheral boosting module to the signal control module through the feedback module;

and filtering out the out-of-band interference signal of the low-frequency switching signal through the filter module, and sending the filtered low-frequency switching signal to the signal parameter detection module.

The peripheral boosting module and the output variable-frequency power supply signal can be detected by feeding back the current information of the peripheral boosting module to the signal control module, and the performance of the power supply circuit is monitored; the out-of-band interference signal of the low-frequency switching signal is filtered by the filter module, so that the interference of the switching noise on the variable-frequency power supply signal output by the power supply circuit is reduced, and the quality of the output variable-frequency power supply signal is improved.

The invention provides a power supply circuit of a digital signal circuit and a variable-frequency power supply signal generation method thereof, comprising the following steps: the device comprises a power supply control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module and a peripheral boosting module; detecting the signal parameter of the low-frequency switching signal generated by the signal control module through a signal parameter detection module, and generating a variable-frequency switching signal according to the signal parameter; the peripheral boosting module generates and outputs a variable-frequency power supply signal according to the variable-frequency switch signal; the variable-frequency power supply signal output by the circuit has switching information of a low-frequency switching signal and is far away from the working frequency band of the digital signal circuit, so that switching noise can be reduced, and the performance of the digital signal circuit is improved; the power supply control module identifies the starting action of the circuit, and can control the power supply circuit to be in a silent state when the digital signal line has no voice call requirement, so that the interference of a switching signal is reduced, and the energy consumption of the power supply circuit is reduced.

It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.

Claims

1. A power supply circuit for a digital subscriber line, comprising: the device comprises a power supply control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module and a peripheral boosting module;

2. The dsl supply circuit of claim 1 wherein said signal parameter detection module comprises a counter and a microcontroller;

3. The power supply circuit of a digital subscriber line according to claim 1, wherein the frequency control module comprises a switch tube unit, a first band-pass filter unit, a second band-pass filter unit, a first capacitor, a first switch unit, a first field effect tube, a first resistor, a second resistor and a first bidirectional regulator tube;

4. The dsl supply circuit of claim 3, wherein the first output terminal of the signal parameter detection module comprises m output ports, the control terminal of the frequency control module comprises m control ports, the switch tube unit comprises m control terminals, the output ports are connected to the control ports in a one-to-one correspondence, and the control ports are connected to the control terminals of the switch tube unit in a one-to-one correspondence;

5. The supply circuit of claim 1, wherein the clock oscillation module comprises a varactor diode, a first inductor, a second capacitor, a third capacitor, a second switch unit, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor;

6. The dsl supply circuit of claim 1 wherein said comparator module comprises a comparator and a second bidirectional regulator;

7. The power supply circuit of claim 1, wherein the peripheral boost module comprises a third band-pass filter unit, a second inductor, an eighth resistor, a ninth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a third switch unit, a first diode, a second diode, a third diode, and a fourth diode;

8. The digital subscriber line supply circuit of claim 7, further comprising a feedback module;

the feedback module comprises a resistor component and an eighth capacitor;

9. The power supply circuit of claim 1, wherein the power control module comprises a fourth switch unit, a ninth capacitor, a fourth bandpass filtering unit, a tenth resistor, an eleventh resistor, a fifth switch unit, and a switch dome;

the switch elastic sheet is installed at the interface of the telephone.

10. The supply circuit of a digital subscriber line according to claim 1, wherein the supply circuit further comprises a fifth order bandpass filtering unit;

11. A method for generating a variable frequency supply signal for a digital signal line, the method being applied to a supply circuit for a digital subscriber line according to any one of claims 1 to 10, the method comprising:

12. The method according to claim 11, wherein the signal parameters specifically include frequency and duty cycle;

13. The method according to claim 11, wherein the frequency control signal is a plurality of potential control signals;

14. The method according to claim 11, wherein the clock oscillation module generates and sends a frequency conversion signal to the comparator module according to the frequency conversion voltage signal, and specifically comprises:

15. The method of claim 11, wherein a duty cycle of the variable frequency switching signal is the same as a duty cycle of the low frequency switching signal.

16. The method of generating a variable frequency supply signal for a digital signal line of claim 11, further comprising: