A power supply circuit for a digital signal line and a method for generating a variable-frequency power supply signal

Abstract

The present invention discloses a power supply circuit for a digital signal line and a method for generating a variable-frequency power supply signal. The circuit includes: a power supply control module, a signal control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module, and a peripheral boost module. The signal parameter detection module detects the signal parameters of the low-frequency switch signal, generates a variable-frequency switch signal according to the signal parameters, and the peripheral boost module generates a variable-frequency power supply signal. The variable-frequency power supply signal output by the circuit has the switch information of the low-frequency switch signal and is far from the working frequency band of the digital signal line, which can reduce the switch noise and improve the performance of the digital signal line. By the power supply control module identifying the circuit startup action, when there is no voice call requirement on the digital signal line, it can control the power supply line to be in a silent state, reduce the interference of the switch signal, and reduce the energy consumption of the power supply circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and specifically, to a power supply circuit for a digital signal line and a method for generating a variable-frequency power supply signal thereof. Background Art

[0002] Currently, the commonly used voice power supply circuits are mostly buck-boost circuits. The buck-boost circuit consists of a SLIC chip (Subscriber Line Interface Circuit) and peripheral triodes and other devices. The switching frequency of the buck-boost circuit is at the kilohertz level, which just falls within the frequency range of DSL (Digital Subscriber Line). The power supply energy of this circuit is relatively high, resulting in relatively serious radiated switching noise and poor performance of the digital subscriber line. Summary of the Invention

[0003] To solve the above problems, embodiments of the present invention propose a power supply circuit for a digital signal line and a method for generating a variable-frequency power supply signal, which can generate a variable-frequency power supply signal according to a low-frequency switching signal. The frequency of the variable-frequency power supply signal is far from the operating frequency band of the digital subscriber line, reducing the signal-to-noise ratio of the digital subscriber line and improving the performance of the digital subscriber line.

[0004] Embodiments of the present invention provide a power supply circuit for a digital subscriber line, including: a power supply control module, a signal control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module, and a peripheral boost module;

[0005] The input end of the power supply control module is used to connect to the power supply of the power supply circuit, and the output end of the power supply control module is connected to the power supply end of the power supply circuit;

[0006] The output end of the signal control module is connected to the input end of the signal parameter detection module, and the reset control end of the signal parameter detection module is used to connect to an external reset control signal;

[0007] The first output end of the signal parameter detection module is connected to the control end of the frequency control module. The input end of the frequency control module is connected to the power supply end. The output end of the frequency control module is connected to the input end of the clock oscillation module. The output end of the clock oscillation module is connected to the first input end of the comparator module;

[0008] The second output end of the signal parameter detection module is connected to the second input end of the comparator module;

[0009] The output terminal of the comparator module is connected to the control terminal of the peripheral boost module. The input terminal of the peripheral boost module is connected to the power supply terminal, and the output terminal of the peripheral boost module is used to output a power supply signal.

[0010] Preferably, the signal parameter detection module includes a counter and a microcontroller.

[0011] The clock input terminal of the counter is connected to the input terminal of the signal parameter detection module. The n output terminals of the counter are sequentially connected to the first input / output terminal to the nth input / output terminal of the microcontroller. The reset terminal of the counter is connected to the first power supply through a current limiting resistor, and the reset terminal of the counter is also connected to the reset control terminal of the signal parameter detection module.

[0012] The (n + 1)th input / output terminal of the microcontroller is connected to the input terminal of the signal parameter detection module. The (n + 2)th input / output terminal of the microcontroller is connected to the first output terminal of the signal parameter detection module, and the (n + 3)th input / output terminal of the microcontroller is connected to the second output terminal of the signal parameter detection module, where n > 0.

[0013] As a preferred embodiment, the frequency control module includes a switching 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 transistor, a first resistor, a second resistor, and a first bidirectional voltage regulator diode.

[0014] The first end of the first resistor is used to connect to the second power supply, and the first end of the first resistor is also connected to the first end of the first capacitor. The second end of the first capacitor is grounded.

[0015] The second end of the first resistor is respectively connected to the input terminal of the switching tube unit, the input terminal of the first band-pass filter unit, and the control terminal of the first switch unit. The output terminal of the first band-pass filter unit is grounded.

[0016] The control terminal of the switching tube unit is connected to the control terminal of the frequency control module, and the output terminal of the switching tube unit is grounded.

[0017] The first end of the second resistor is connected to the input terminal of the frequency control module, and the first end of the second resistor is also connected to the source electrode of the first field-effect transistor. The second end of the second resistor is respectively connected to the gate electrode of the first field-effect transistor and the input terminal of the first switch unit. The output terminal of the first switch unit is grounded.

[0018] The drain of the first field effect transistor is respectively connected to 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 diode, and the second end of the second band-pass filtering unit and the second end of the first bidirectional voltage stabilizing diode are both grounded.

[0019] 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 switching transistor unit includes m control ends, the output ports are connected to the control ports in a one-to-one correspondence, and the control ports are connected to the control ends of the switching transistor unit in a one-to-one correspondence;

[0020] The switching transistor unit includes m switching transistors. The input end of any one of the switching transistors is connected to the input end of the switching transistor unit, the control end of the switching transistor is connected to the control end of the switching transistor unit in a one-to-one correspondence, and the output end of any one of the switching transistors is connected to the output end of the switching transistor unit, where m > 0.

[0021] Preferably, the clock oscillation module includes a varactor diode, a first inductor, a second capacitor, a third capacitor, a second switching unit, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor;

[0022] The first end of the third resistor is used to connect to a third power supply, and the first end of the third resistor is also connected to the first end of the fourth resistor. The second end of the third resistor is respectively connected to the control end of the second switching unit, the first end of the fifth resistor, the first end of the second capacitor, and the negative electrode of the varactor diode;

[0023] The input end of the second switching unit is connected to the second end of the fourth resistor, and the output end of the second switching unit is respectively connected to the first end of the sixth resistor and the first end of the third capacitor;

[0024] The second end of the fifth resistor, the second end of the sixth resistor, the second end of the third capacitor, and the second end of the second capacitor are all grounded;

[0025] The negative electrode of the varactor diode is also connected to the input end of the clock oscillation module. The positive electrode of the varactor diode is connected to the first end of the first inductor. The second end of the first inductor is connected to the first end of the seventh resistor, and the second end of the seventh resistor is connected to the output end of the second switching unit and the output end of the clock oscillation module.

[0026] As a preferred embodiment, the comparator module includes a comparator and a second bidirectional voltage stabilizing diode;

[0027] The first input terminal of the comparator module is connected to the inverting input terminal of the comparator, and the second input terminal of the comparator module is connected to the non-inverting input terminal of the comparator; the output terminal of the comparator is grounded through the second bidirectional voltage stabilizing diode, and the output terminal of the comparator is also connected to the output terminal of the comparator module.

[0028] Preferably, the peripheral boost 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;

[0029] Wherein, the first end of the second inductor is respectively connected to the input terminal of the peripheral boost module, the input terminal of the third band-pass filtering unit, and the first end of the eighth resistor, and the output terminal of the third band-pass filtering unit is grounded;

[0030] The second end of the eighth resistor is connected to the first end of the fourth capacitor, and the second end of the fourth capacitor is respectively connected to the second end of the second inductor, the first end of the fifth capacitor, the input terminal of the third switching unit, the positive electrode of the first diode, and the negative electrode of the second diode;

[0031] The control terminal of the third switching unit is connected to the control terminal of the peripheral boost module;

[0032] The second end of the fifth capacitor is respectively connected to the positive electrode of the third diode and the negative electrode of the fourth diode, the positive electrode of the fourth diode is respectively connected to the first end of the ninth resistor and the first end of the sixth capacitor, the second end of the sixth capacitor is respectively connected to the negative electrode of the third diode, the positive electrode of the second diode, and the first end of the seventh capacitor, and the second end of the seventh capacitor is respectively connected to the output terminal of the third switching unit and the negative electrode of the first diode;

[0033] The second end of the ninth resistor is connected to the output terminal of the peripheral boost module.

[0034] Furthermore, the power supply circuit further includes a feedback module;

[0035] The feedback module includes a resistor component and an eighth capacitor;

[0036] The resistor component is composed of several resistors connected in parallel. The first end of the resistor component is connected to the first input terminal of the feedback module, and the first input terminal of the feedback module is connected to the output terminal of the third switching unit;

[0037] The second end of the resistor component is connected to the first end of the eighth capacitor, the second end of the eighth capacitor is connected to the second input terminal of the feedback module, and the second input terminal of the feedback module is connected to the first end of the ninth resistor;

[0038] The first end of the resistor component is connected to the first output terminal of the feedback module, the first output terminal of the feedback module is connected to the first feedback terminal of the signal control module, the second end of the resistor component is connected to the second output terminal of the feedback module, and the second output terminal of the feedback module is connected to the second feedback terminal of the signal control module.

[0039] Further, the power supply control module includes a fourth switch unit, a ninth capacitor, a fourth band-pass filtering unit, a tenth resistor, an eleventh resistor, a fifth switch unit, and a switch shrapnel;

[0040] The input terminal of the power supply control module is respectively connected to the first end of the tenth resistor, the first end of the ninth capacitor, and the input terminal of the fourth switch unit;

[0041] The second end of the tenth resistor is respectively connected to the second end of the ninth capacitor, the control terminal of the fourth switch unit, and the input terminal of the fifth switch unit. The output terminal of the fourth switch unit is respectively connected to the second end of the ninth capacitor, the input terminal of the fourth band-pass filtering unit, and the output terminal of the power supply control module. The output terminal of the fourth band-pass filtering unit is grounded;

[0042] The output terminal of the fifth switch unit is grounded. The control terminal of the fifth switch unit is respectively connected to the first end of the eleventh resistor and the first end of the switch shrapnel. The second end of the switch shrapnel is grounded, and the second end of the eleventh resistor is used to connect to a fourth power supply;

[0043] The switch shrapnel is installed at the phone interface.

[0044] Preferably, the power supply circuit further includes a fifth-order band-pass filtering unit;

[0045] The output terminal of the signal control module is connected to the input terminal of the signal parameter detection module. Specifically, the output terminal of the signal control module is connected to the input terminal of the fifth-order band-pass filtering unit, and the output terminal of the fifth-order band-pass filtering unit is connected to the input terminal of the signal parameter detection module.

[0046] A power supply circuit for a digital subscriber line provided by an embodiment of the present invention includes: a power supply control module, a signal control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module, and a peripheral boost module; the duty cycle of the variable-frequency power supply signal output by the power supply circuit is the same as the duty cycle of the low-frequency signal output by the signal control module and contains the switching information of the low-frequency signal, realizing the power supply control of the digital subscriber line, and the frequency of the output variable-frequency power supply signal is far from the working frequency band of the digital subscriber line, which can reduce the signal-to-noise ratio of the digital subscriber line and improve the performance of the digital subscriber line.

[0047] An embodiment of the present invention also provides a method for generating a variable-frequency power supply signal for a digital signal line, which is applicable to the power supply circuit of the digital subscriber line described in any of the above embodiments. The method includes:

[0048] When the power supply control module detects the start-up action of the circuit, it supplies power to the frequency control module and the peripheral boost module, generates and sends a start signal to the signal control module;

[0049] The signal control module generates and sends a low-frequency switch signal to the signal parameter detection module according to the start signal;

[0050] The signal parameter detection module detects the signal parameters of the low-frequency switch signal, and according to the signal parameters, generates and sends a frequency control signal to the frequency control module, and generates and sends a duty cycle control signal to the comparator module;

[0051] The frequency control module generates and sends a variable-frequency voltage signal to the clock oscillation module according to the frequency control signal;

[0052] The clock oscillation module generates and sends a variable-frequency signal to the comparator module according to the variable-frequency voltage signal;

[0053] The comparator module generates and sends a variable-frequency switch signal to the peripheral boost module according to the duty cycle control signal and the variable-frequency signal;

[0054] The peripheral boost module generates and outputs a variable-frequency power supply signal according to the variable-frequency switch signal.

[0055] As a preferred method, the signal parameters specifically include frequency and duty cycle;

[0056] The signal parameter detection module detects the signal parameters of the low-frequency switch signal, and according to the signal parameters, generates and sends a frequency control signal to the frequency control module, and generates and sends a duty cycle control signal to the comparator module, specifically including:

[0057] The signal parameter detection module calculates the number of pulse rising edges of the low-frequency switch signal within a preset time period to obtain the frequency of the low-frequency switch signal;

[0058] The signal parameter detection module obtains the high-potential time by detecting the time difference between adjacent rising edges and falling edges of the low-frequency switch signal, and calculates the duty cycle of the low-frequency switch signal according to the high-potential time and the frequency;

[0059] 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 cycle control signal to the comparator module according to the duty cycle;

[0060] The signal parameter detection module also controls the re-detection of the signal parameters of the low-frequency switch signal through its own reset control terminal.

[0061] Preferably, the frequency control signal is a plurality of path potential control signals;

[0062] The frequency control module generates and sends a frequency conversion voltage signal to the clock oscillation module according to the frequency control signal, specifically including:

[0063] The frequency control module receives a plurality of path potential control signals and converts the plurality of path potential control signals into a path frequency conversion voltage signal;

[0064] The frequency control module sends the frequency conversion voltage signal to the clock oscillation module.

[0065] Preferably, the clock oscillation module generates and sends a frequency conversion signal to the comparator module according to the frequency conversion voltage signal, specifically including:

[0066] The clock oscillation module receives the frequency conversion voltage signal and controls the capacitance of the varactor diode of the clock oscillation module through the frequency conversion voltage signal;

[0067] The clock oscillation module controls the frequency of the frequency conversion signal through the capacitance of the varactor diode;

[0068] The clock oscillation module sends the frequency conversion signal to the comparator module.

[0069] As a preferred method, the duty cycle of the frequency conversion switch signal is the same as the duty cycle of the low-frequency switch signal.

[0070] Preferably, the method further includes:

[0071] The current information of the peripheral boost module is fed back to the signal control module through the feedback module of the power supply circuit;

[0072] The out-of-band interference signal of the low-frequency switching signal is filtered by the filter module of the power supply circuit, and the filtered low-frequency switching signal is sent to the signal parameter detection module.

[0073] A power supply circuit for a digital signal line and a method for generating a frequency-converted power supply signal provided by the present invention. The circuit includes: a power supply control module, a signal control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module, and a peripheral boost module; the signal parameter detection module detects the signal parameters of the low-frequency switching signal, generates a frequency-converted switching signal according to the signal parameters, and the peripheral boost module generates a frequency-converted power supply signal; the frequency-converted power supply signal output by the circuit has the switching information of the low-frequency switching signal and is far from the working frequency band of the digital signal line, which can reduce switching noise and improve the performance of the digital signal line; the power supply control module identifies the circuit startup operation, and can control the power supply line to be in a silent state when there is no voice call requirement on the digital signal line, reduce the interference of the switching signal, and reduce the power consumption of the power supply circuit. Description of the Drawings

[0074] Figure 1 is a schematic structural diagram of a power supply circuit for a digital subscriber line provided by an embodiment of the present invention;

[0075] Figure 2 is a schematic circuit diagram of the signal parameter detection module provided by an embodiment of the present invention;

[0076] Figure 3 is a schematic circuit diagram of the frequency control module provided by an embodiment of the present invention;

[0077] Figure 4 is a schematic circuit diagram of the clock oscillation module provided by an embodiment of the present invention;

[0078] Figure 5 is a schematic circuit diagram of the comparator module provided by an embodiment of the present invention;

[0079] Figure 6 is a schematic circuit diagram of the peripheral boost module and the feedback module provided by an embodiment of the present invention;

[0080] Figure 7 is a schematic circuit diagram of the power supply control module provided by an embodiment of the present invention;

[0081] Figure 8 is a schematic flow diagram of a method for generating a frequency-converted power supply signal for a digital signal line provided by an embodiment of the present invention. Detailed Embodiments

[0082] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0083] An embodiment of the present invention provides a power supply circuit for a digital subscriber line. Refer to Figure 1 , which is a schematic structural diagram of a power supply circuit for a digital subscriber line provided by an embodiment of the present invention. The power supply circuit includes: a power control module, a signal control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module, and a peripheral boost module;

[0084] The input end of the power control module is used to connect to the power supply of the power supply circuit, and the output end of the power control module is connected to the power supply end of the power supply circuit;

[0085] The output end of the signal control module is connected to the input end of the signal parameter detection module, and the reset control end of the signal parameter detection module is used to connect to an external reset control signal;

[0086] The first output end of the signal parameter detection module is connected to the control end of the frequency control module. The input end of the frequency control module is connected to the power supply end. The output end of the frequency control module is connected to the input end of the clock oscillation module. The output end of the clock oscillation module is connected to the first input end of the comparator module;

[0087] The second output end of the signal parameter detection module is connected to the second input end of the comparator module;

[0088] The output end of the comparator module is connected to the control end of the peripheral boost module. The input end of the peripheral boost module is connected to the power supply end. The output end of the peripheral boost module is used to output a power supply signal.

[0089] When specifically implementing this embodiment, the input end IN7 of the power control module is used to connect to the power supply Vin of the power supply circuit. The output end OUT7 of the power control module is connected to the power supply end of the power supply circuit, and the frequency control module and the peripheral boost module are powered through the power supply end;

[0090] The output end OUT0 of the signal control module is connected to the input end IN1 of the signal parameter detection module; the reset control end RST of the signal parameter detection module is used to connect to an external reset control signal, and the reset control signal can control the reset of the signal parameter detection module.

[0091] The first output terminal OUT1 of the signal parameter detection module is connected to the control terminal CONTROL1 of the frequency control module. The input terminal IN2 of the frequency control module is connected to the power supply terminal. The output terminal OUT3 of the frequency control module is connected to the input terminal IN3 of the clock oscillation module. The output terminal OUT4 of the clock oscillation module is connected to the first input terminal IN4 of the comparator module;

[0092] The second output terminal OUT2 of the signal parameter detection module is connected to the second input terminal IN5 of the comparator module;

[0093] The output terminal OUT5 of the comparator module is connected to the control terminal CONTROL2 of the peripheral boost module. The input terminal IN6 of the peripheral boost module is connected to the power supply terminal. The output terminal OUT6 of the peripheral boost module is used to output the power supply signal Vout.

[0094] The working principle of the power supply circuit is specifically as follows: When the power supply control module detects the startup action of the power supply circuit, the power supply powers the power supply circuit through the power supply control module;

[0095] The signal control module sends the generated low-frequency switch signal to the signal parameter detection module. The signal parameter detection module detects the frequency parameter and duty cycle parameter of the low-frequency switch signal, generates a frequency control signal according to the frequency parameter, and sends the frequency control signal to the frequency control module. It generates a duty cycle control signal according to the duty cycle parameter and sends the duty cycle control signal to the comparator module. Among them, the frequency control signal is mostly high and low level signals, and the duty cycle control signal includes the obtained duty cycle parameter information. The frequency control module generates and sends a frequency conversion voltage signal to the clock oscillation module according to the received frequency control signal. The clock oscillation module generates and sends a frequency conversion signal to the comparator module according to the received frequency conversion voltage signal. The comparator module generates a frequency conversion switch signal according to the received duty cycle control signal and frequency conversion signal, and sends the frequency conversion switch signal to the peripheral boost module. The peripheral boost module generates and outputs a frequency conversion power supply signal according to the received frequency conversion switch signal to power the digital subscriber line.

[0096] A power supply circuit for a digital subscriber line provided by an embodiment of the present invention includes: a power supply control module, a signal control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module, and a peripheral boost module; The duty cycle of the frequency conversion power supply signal output by the power supply circuit is the same as the duty cycle of the low-frequency signal output by the signal control module and includes the switch information of the low-frequency signal, realizing the power supply control of the digital subscriber line. The frequency of the output frequency conversion power supply signal is far from the working frequency band of the digital subscriber line, which can reduce the signal-to-noise ratio of the digital subscriber line and improve the performance of the digital subscriber line.

[0097] In another embodiment provided by the present invention, the signal parameter detection module includes a counter and a microcontroller;

[0098] The clock input terminal of the counter is connected to the input terminal of the signal parameter detection module. The n output terminals of the counter are sequentially connected to the first input / output terminal to the nth input / output terminal of the microcontroller. The reset terminal of the counter is connected to the first power supply through a current-limiting resistor, and the reset terminal of the counter is also connected to the reset control terminal of the signal parameter detection module;

[0099] The (n + 1)th input / output terminal of the microcontroller is connected to the input terminal of the signal parameter detection module; the (n + 2)th input / output terminal of the microcontroller is connected to the first output terminal of the signal parameter detection module; the (n + 3)th input / output terminal of the microcontroller is connected to the second output terminal of the signal parameter detection module, where n > 0.

[0100] When specifically implementing this embodiment, refer to Figure 2 , which is the circuit schematic diagram of the signal parameter detection module provided by the embodiment of the present invention. The signal parameter detection module includes a 4-bit synchronous binary counter and a microcontroller MCU;

[0101] The CLK terminal of the 4-bit synchronous binary counter is connected to the input terminal IN1 of the signal parameter detection module, and the general-purpose input / output terminal GPIO1 of the MCU is also connected to the input terminal IN1 of the signal parameter detection module; the reset terminal RD of the 4-bit synchronous binary counter is connected to the reset control terminal RST of the signal parameter detection module, and the reset terminal RD of the 4-bit synchronous binary counter is also connected to the first power supply VCC1 through a current-limiting resistor Ri;

[0102] The 4 output terminals Q1 to Q4 of the 4-bit synchronous binary counter are respectively connected to the general-purpose input / output terminals GPIO2 to GPIO5 of the MCU; the general-purpose input / output terminal GPIO6 of the MCU is connected to the first output terminal OUT2 of the signal parameter detection module to output a duty cycle control signal; the general-purpose input / output terminals GPIO7 to GPIOm of the MCU are connected to the second output terminal OUT1 of the signal parameter detection module to output a frequency control signal.

[0103] It should be noted that in this embodiment, a 4-bit synchronous binary counter and an MCU are specifically used as an example to illustrate a preferred circuit implementation manner. In other embodiments, the counter and the microcontroller can adopt other implementation manners. As long as the circuit working principle is the same, they all fall within the protection scope of the present invention.

[0104] The frequency parameter of the low-frequency signal is detected by a counter, the duty cycle parameter of the low-frequency signal is detected by a microcontroller, and the frequency control signal and the duty cycle control signal are output by the microcontroller. By detecting the parameters of the low-frequency signal, it can ensure that the variable-frequency power supply signal output by frequency conversion retains the switching characteristics of the low-frequency signal and maintains the stability of the switching performance of the power supply circuit.

[0105] 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 voltage regulator tube;

[0106] The first end of the first resistor is used to connect to a second power supply, and the first end of the first resistor is also connected to the first end of the first capacitor, and the second end of the first capacitor is grounded;

[0107] The second end of the first resistor is respectively connected to the input end of the switching tube unit, the input end of the first band-pass filtering unit, and the control end of the first switching unit, and the output end of the first band-pass filtering unit is grounded;

[0108] The control end of the switching tube unit is connected to the control end of the frequency control module, and the output end of the switching tube unit is grounded;

[0109] The first end of the second resistor is connected to the input end of the frequency control module, and the first end of the second resistor is also connected to the source electrode of the first field-effect transistor. The second end of the second resistor is respectively connected to the gate electrode of the first field-effect transistor and the input end of the first switching unit; the output end of the first switching unit is grounded;

[0110] The drain electrode of the first field-effect transistor is respectively connected to 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 regulator tube, and the second end of the second band-pass filtering unit and the second end of the first bidirectional voltage regulator tube are both grounded.

[0111] When specifically implementing this embodiment, refer to Figure 3 , which is the circuit schematic diagram of the frequency control module provided by the embodiment of the present invention. 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 transistor T1, a first resistor R1, a second resistor R2, and a first bidirectional voltage regulator tube W1;

[0112] It should be noted that in the solution disclosed in the present invention, the first switching unit Q1 is a unit with a switching function. In this embodiment, the first switching unit Q1 is a triode;

[0113] 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 with band-pass filtering functions. In this embodiment, both the first band-pass filtering unit U1 and the second band-pass filtering unit U2 are composed of a low-frequency filtering capacitor and a high-frequency filtering capacitor connected in parallel;

[0114] The first end of the first resistor R1 is used to connect to the second power supply VCC2. The first end of the first resistor R1 is also connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded;

[0115] The second end of the first resistor R1 is respectively connected to the input end of the switching tube unit, the input end of the first band-pass filtering unit U1, and the base of the first switching unit Q1. The output end of the first band-pass filtering unit U1 is grounded;

[0116] The control end of the switching tube unit is connected to the control end CONTROL1 of the frequency control module, and the output end of the switching tube unit is grounded;

[0117] The first end of the second resistor R2 is connected to the input end IN2 of the frequency control module. The first end of the second resistor R2 is also connected to the source of the first field-effect transistor T1. The second end of the second resistor R2 is respectively connected to the gate of the first field-effect transistor T1 and the collector of the first switching unit Q1. The emitter of the first switching unit Q1 is grounded;

[0118] The drain of the first field-effect transistor T1 is respectively connected to the output end OUT3 of the frequency control module, the input end of the second band-pass filtering unit U2, and the first end of the first bidirectional voltage regulator diode W1. The second end of the second band-pass filtering unit U2 and the second end of the first bidirectional voltage regulator diode W1 are both grounded.

[0119] It should be noted that the emitter of the first switching unit Q1 can be grounded through a current-limiting resistor to prevent excessive current from damaging the switching tube.

[0120] The received frequency control signal is converted into a potential signal by the switching tube unit, and then converted into a specific frequency control voltage signal through the triode unit and the field-effect transistor and output. During this process, through the band-pass filtering unit and the bidirectional voltage regulator diode, the stability of the signal conversion process is maintained, and interference signals are filtered out to improve the quality of the output frequency conversion voltage signal.

[0121] 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 switching tube unit includes m control ends, the output ports are connected to the control ports in one-to-one correspondence, and the control ports are connected to the control ends of the switching tube unit in one-to-one correspondence;

[0122] The switching transistor unit includes m switching transistors. The input end of any one of the switching transistors is connected to the input end of the switching transistor unit. The control end of the switching transistor is connected to the control end of the switching transistor unit in a one-to-one correspondence. The output end of any one of the switching transistors is connected to the output end of the switching transistor unit.

[0123] During the specific implementation of this embodiment, refer to Figure 3 , the switching transistor unit of the frequency control module includes m switching transistors, which are K1 to Km respectively;

[0124] It should be noted that the switching transistors in the switching transistor unit in this embodiment are taken as triodes for illustration. In other embodiments, other switching transistors can be used in the switching transistor unit;

[0125] The first output end OUT1 of the signal parameter detection module includes m output ports. The control end of the frequency control module includes m control ports. The switching transistor unit includes m control ends. The output ports are connected to the control ports in a one-to-one correspondence. The control ports are connected to the control ends of the switching transistor unit in a one-to-one correspondence; where m > 0

[0126] The collector of any one of the switching transistors is connected to the input end of the switching transistor unit. The base of each switching transistor is connected to each control end of the switching transistor unit in a one-to-one correspondence. The emitter of any one of the switching transistors is connected to the output end of the switching transistor unit;

[0127] It should be noted that a current-limiting resistor can be connected to the base, emitter, and collector of each switching transistor in the switching transistor unit to avoid damage to the switching transistor due to excessive current;

[0128] By using multiple switching transistors, the multiplexed signals output by the signal parameter detection module can be converted. The frequency control signal output by the signal parameter detection module is a multiplexed potential signal. As the number of potential signals increases, the number of switching transistors used in the switching transistor unit corresponds to it, which can improve the accuracy of the frequency conversion voltage signal and achieve precise control of the frequency of the frequency conversion signal.

[0129] 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 switching unit, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor;

[0130] The first end of the third resistor is used to connect to a third power supply. The first end of the third resistor is also connected to the first end of the fourth resistor. The second end of the third resistor is respectively connected to the control end of the second switching unit, the first end of the fifth resistor, the first end of the second capacitor, and the negative electrode of the varactor diode;

[0131] The input end of the second switching unit is connected to the second end of the fourth resistor, and the output end of the second switching unit is respectively connected to the first end of the sixth resistor and the first end of the third capacitor;

[0132] The second end of the fifth resistor, the second end of the sixth resistor, the second end of the third capacitor, and the second end of the second capacitor are all grounded;

[0133] The negative electrode of the varactor diode is also connected to the input end of the clock oscillation module, the positive electrode of the varactor diode is connected to the first end of the first inductor, the second end of the first inductor is connected to the first end of the seventh resistor, and the second end of the seventh resistor is connected to the input end of the second switching unit and the output end of the clock oscillation module.

[0134] When specifically implementing this embodiment, refer to Figure 4 which is the circuit schematic diagram of the clock oscillation module provided by the embodiment of the present invention. The clock oscillation module includes a varactor diode VD1, a first inductor L1, a second capacitor C2, a third capacitor C3, a second switching unit Q2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7;

[0135] It should be noted that in the present invention, the second switching unit Q2 is a unit with a switching function, and a switching unit composed of multiple triodes can be selected; in this embodiment, the second switching unit Q2 is specifically a triode;

[0136] The first end of the third resistor R3 is used to connect to the third power supply VCC3. The first end of the third resistor R3 is also connected to the first end of the fourth resistor R4. The second end of the third resistor R3 is respectively connected to the base of the second switching unit Q2, the first end of the fifth resistor R5, the first end of the second capacitor C2, and the negative electrode of the varactor diode VD1;

[0137] The collector of the second switching unit Q2 is connected to the second end of the fourth resistor R4, and the emitter of the second switching unit Q2 is respectively connected to the first end of the sixth resistor R6 and the first end of the third capacitor C3;

[0138] 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;

[0139] The negative electrode of the varactor diode VD1 is also connected to the input end IN3 of the clock oscillation module. The positive electrode of the varactor diode VD1 is connected to the first end of the first inductor L1. The second end of the first inductor L1 is connected to the first end of the seventh resistor R7. The second end of the seventh resistor R7 is connected to the emitter of the second switching unit Q2 and the output end OUT4 of the clock oscillation module.

[0140] Through the input frequency conversion voltage signal at the input end of the clock oscillation module, the varactor diode adjusts the capacitance according to the frequency conversion voltage signal. By changing the capacitance, the frequency of the frequency signal output by the clock oscillation module is controlled to achieve the output of the frequency conversion signal.

[0141] In another embodiment provided by the present invention, the comparator module includes a comparator and a second bidirectional voltage stabilizing diode;

[0142] The first input end of the comparator module is connected to the inverting input end of the comparator, and the second input end of the comparator module is connected to the non-inverting input end of the comparator; the output end of the comparator is grounded through the second bidirectional voltage stabilizing diode, and the output end of the comparator is also connected to the output end of the comparator module.

[0143] During the specific implementation of this embodiment, refer to Figure 5 , which is the circuit schematic diagram of the comparator module provided by the embodiment of the present invention. The comparator module includes a comparator A and a second bidirectional voltage stabilizing diode W2;

[0144] The first input end IN4 of the comparator module is connected to the inverting input end of the comparator A, and the second input end IN5 of the comparator module is connected to the non-inverting input end of the comparator A; the output end of the comparator A is grounded through the second bidirectional voltage stabilizing diode W2, and the output end of the comparator A is also connected to the output end OUT5 of the comparator module;

[0145] It should be noted that in this embodiment, a current limiting resistor can be connected to both the input and output ends of the comparator A;

[0146] The frequency conversion signal and the duty cycle control signal are input to the comparator together. The comparator can output a path of frequency conversion switch signal according to the input signals, and the frequency conversion switch signal includes the duty cycle and switch information of the low-frequency signal.

[0147] In another embodiment provided by the present invention, the peripheral boost 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;

[0148] Wherein, the first end of the second inductor is respectively connected to the input end of the peripheral boost module, the input end of the third band-pass filtering unit, and the first end of the eighth resistor, and the output end of the third band-pass filtering unit is grounded;

[0149] The second terminal of the eighth resistor is connected to the first terminal of the fourth capacitor, and the second terminal of the fourth capacitor is respectively connected to the second terminal of the second inductor, the first terminal of the fifth capacitor, the input terminal of the third switch unit, the positive electrode of the first diode, and the negative electrode of the second diode;

[0150] The control terminal of the third switch unit is connected to the control terminal of the peripheral boost module;

[0151] The second terminal of the fifth capacitor is respectively connected to the positive electrode of the third diode and the negative electrode of the fourth diode. The positive electrode of the fourth diode is respectively connected to the first terminal of the ninth resistor and the first terminal of the sixth capacitor. The second terminal of the sixth capacitor is respectively connected to the negative electrode of the third diode, the positive electrode of the second diode, and the first terminal of the seventh capacitor. The second terminal of the seventh capacitor is respectively connected to the output terminal of the third switch unit and the negative electrode of the first diode;

[0152] The second terminal of the ninth resistor is connected to the output terminal of the peripheral boost module.

[0153] When specifically implementing this embodiment, refer to Figure 6 , which is the circuit schematic diagram of the peripheral boost module and the feedback module provided by the embodiment of the present invention; the peripheral boost module includes 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 switch unit Q3, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4;

[0154] It should be noted that in the solution disclosed in the present invention, the third band-pass filter unit U3 is a unit with a band-pass filtering function. In this embodiment, the third band-pass filter unit U3 is composed of a low-frequency filtering capacitor and a high-frequency filtering capacitor connected in parallel;

[0155] It should be noted that the third switch unit Q3 is a circuit with a switching function, having a control terminal, an input terminal, and an output terminal. In this embodiment, the third switch unit Q3 is a MOS transistor. In other embodiments, the third switch unit Q3 can be other optional implementation manners.

[0156] The first terminal of the second inductor L2 is respectively connected to the input terminal IN6 of the peripheral boost module, the input terminal of the third band-pass filter unit U3, and the first terminal of the eighth resistor R8, and the output terminal of the third band-pass filter unit U3 is grounded;

[0157] The second end of the eighth resistor R8 is connected to the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is respectively connected to the second end of the second inductor L2, the first end of the fifth capacitor R5, the source of the third switching unit Q3, the positive electrode of the first diode D1, and the negative electrode of the second diode D2;

[0158] The gate of the third switching unit Q3 is connected to the control terminal CONTROL of the peripheral boost module;

[0159] The second end of the fifth capacitor C5 is respectively connected to the positive electrode of the third diode D3 and the negative electrode of the fourth diode D4. The positive electrode of the fourth diode D4 is respectively connected to the first end of the ninth resistor R9 and the first end of the sixth capacitor C6. The second end of the sixth capacitor C6 is respectively connected to the negative electrode of the third diode D3, the positive electrode of the second diode D2, and the first end of the seventh capacitor C7. The second end of the seventh capacitor C7 is respectively connected to the drain of the third switching unit Q3 and the negative electrode of the first diode D1;

[0160] The second end of the ninth resistor R9 is connected to the output terminal OUT6 of the peripheral boost module.

[0161] It should be noted that a diode can be connected between the source and the drain of the third switching unit Q3. The positive electrode of the diode is connected to the drain of the third switching unit Q3, and the negative electrode of the diode is connected to the source of the third switching unit Q3 to prevent reverse current from damaging the third switching unit Q3.

[0162] The peripheral boost module receives the variable-frequency switching signal output by the comparator module, and the peripheral boost module converts the low-voltage signal of the variable-frequency switching signal to a high-voltage state for powering the digital subscriber line.

[0163] In another embodiment provided by the present invention, the power supply circuit further includes a feedback module;

[0164] The feedback module includes a resistor component and an eighth capacitor;

[0165] The resistor component is composed of a plurality of resistors connected in parallel. The first end of the resistor component is connected to the first input terminal of the feedback module, and the first input terminal of the feedback module is connected to the output terminal of the third switching unit;

[0166] The second end of the resistor component is connected to the first end of the eighth capacitor, the second end of the eighth capacitor is connected to the second input terminal of the feedback module, and the second input terminal of the feedback module is connected to the first end of the ninth resistor;

[0167] The first end of the resistor component is connected to the first output end of the feedback module, the first output end of the feedback module is connected to the first feedback end of the signal control module, the second end of the resistor component is connected to the second output end of the feedback module, and the second output end of the feedback module is connected to the second feedback end of the signal control module.

[0168] In the specific implementation of this embodiment, refer to Figure 6 , the power supply circuit further includes a feedback module;

[0169] The feedback module includes a resistor component R and an eighth capacitor C8;

[0170] The resistor component R is composed of several resistors connected in parallel, which can achieve a small resistance while passing a larger current; it should be noted that in the drawings of this embodiment, the number of parallel resistors in the resistor component R is five, and in other embodiments, it can be other preferred implementation manners.

[0171] The first end of the resistor component R is connected to the drain of the third switch unit Q3;

[0172] The second end of the resistor component R is connected to the first end of the eighth capacitor C8, and the second end of the eighth capacitor C8 is connected to the first end of the ninth resistor R9;

[0173] The first end of the resistor component R is connected to the first output end F1 of the feedback module, the first output end of the feedback module is connected to the first feedback end of the signal control module, the second end of the resistor component R is connected to the second output end F2 of the feedback module, and the second output end of the feedback module is connected to the second feedback end of the signal control module.

[0174] By the feedback module, the current and voltage information output by the peripheral boost module is fed back, and a resistor component is used for feedback, so the feedback accuracy is higher.

[0175] In another embodiment provided by the present invention, the power supply control module includes a fourth switch unit, a ninth capacitor, a fourth band-pass filtering unit, a tenth resistor, an eleventh resistor, a fifth switch unit, and a switch shrapnel;

[0176] The input end of the power supply control module is respectively connected to the first end of the tenth resistor, the first end of the ninth capacitor, and the input end of the fourth switch unit;

[0177] The second end of the tenth resistor is respectively connected to the second end of the ninth capacitor, the control end of the fourth switch unit, and the input end of the fifth switch unit. The output end of the fourth switch unit is respectively connected to the second end of the ninth capacitor, the input end of the fourth band-pass filtering unit, and the output end of the power supply control module. The output end of the fourth band-pass filtering unit is grounded;

[0178] The output terminal of the fifth switch unit is grounded. The control terminal of the fifth switch unit is connected to the first terminal of the eleventh resistor and the first terminal of the switch shrapnel respectively. The second terminal of the switch shrapnel is grounded. The second terminal of the eleventh resistor is used to connect to the fourth power supply.

[0179] The switch shrapnel is installed at the phone interface.

[0180] When this embodiment is specifically implemented, refer to Figure 7 , which is the circuit schematic diagram of the power control module provided by the embodiment of the present invention. The power control module includes a fourth switch unit Q4, a ninth capacitor C9, a fourth band-pass filter unit U4, a tenth resistor R10, an eleventh resistor R11, a fifth switch unit Q5, and a switch shrapnel S1;

[0181] It should be noted that in the solution disclosed in the present invention, the fourth switch unit Q4 is a unit with a switching function. In this embodiment, the fourth switch unit Q4 is a MOS transistor;

[0182] It should be noted that in the solution disclosed in the present invention, the fifth switch unit Q5 is a unit with a switching function. In this embodiment, the fifth switch unit Q5 is a triode;

[0183] It should be noted that in the solution disclosed in the present invention, the fourth band-pass filter unit U4 is a unit with a band-pass filtering function. In this embodiment, the fourth band-pass filter unit U4 is composed of a low-frequency filtering capacitor and a high-frequency filtering capacitor connected in parallel;

[0184] The input terminal IN7 of the power control module is connected to the first terminal of the tenth resistor R10, the first terminal of the ninth capacitor C9, and the input terminal of the fourth switch unit Q4 respectively;

[0185] The second terminal of the tenth resistor R10 is connected to the second terminal of the ninth capacitor C9, the gate of the fourth switch unit Q4, and the collector of the fifth switch unit Q5 respectively. The source of the fourth switch unit Q4 is connected to the second terminal of the ninth capacitor C9, the input terminal of the fourth band-pass filter unit U4, and the output terminal OUT7 of the power control module respectively. The output terminal of the fourth band-pass filter unit U4 is grounded;

[0186] The emitter of the fifth switch unit Q5 is grounded. The base of the fifth switch unit Q5 is connected to the first terminal of the eleventh resistor R11 and the first terminal of the switch shrapnel S1 respectively. The second terminal of the switch shrapnel S1 is grounded. The second terminal of the eleventh resistor R11 is used to connect to the fourth power supply VCC4. The switch shrapnel S1 is installed at the phone interface.

[0187] In the default state, the switch shrapnel S1 is closed. When the phone is inserted into the phone interface, the switch shrapnel S1 pops open, the fifth switch unit Q5 conducts, and the fourth switch unit Q4 conducts, outputting the input power supply signal to the power supply terminal.

[0188] Through the power control module, when there is no voice call requirement on the digital subscriber line, the power supply to the power supply terminal of the power supply circuit is disconnected, reducing the interference of the power supply circuit to the digital subscriber line and being able to reduce power consumption.

[0189] In another embodiment provided by the present invention, the power supply circuit further includes a fifth-order band-pass filtering unit;

[0190] The output end of the signal control module is connected to the input end of the signal parameter detection module. Specifically: the output end of the signal control module is connected to 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 to the input end of the signal parameter detection module.

[0191] When specifically implementing this embodiment, the fifth-order band-pass filtering unit can be a fifth-order band-pass filter, which is connected between the signal control module and the signal parameter detection module, and is used to filter out the out-of-band interference information of the low-frequency signal sent by the signal control module and improve the quality of the low-frequency signal.

[0192] A power supply circuit for a digital subscriber line provided by an embodiment of the present invention includes: a power control module, a signal control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module, and a peripheral boost module; the duty cycle of the variable-frequency power supply signal output by the power supply circuit is the same as the duty cycle of the low-frequency signal output by the signal control module and contains the switching information of the low-frequency signal, realizing the power supply control of the digital subscriber line. The frequency of the output variable-frequency power supply signal is far from the working frequency band of the digital subscriber line, which can reduce the signal-to-noise ratio of the digital subscriber line and improve the performance of the digital subscriber line.

[0193] An embodiment of the present invention also provides a method for generating a variable-frequency power supply signal for a digital signal line. Refer to Figure 8 , which is a schematic flowchart of a method for generating a variable-frequency power supply signal for a digital signal line provided by an embodiment of the present invention. The method is applicable to the power supply circuit of any of the above-mentioned digital subscriber lines. The method includes steps S101 to S107:

[0194] S101, when the power control module detects the start-up action of the circuit, it supplies power to the frequency control module and the peripheral boost module, generates and sends a start signal to the signal control module;

[0195] S102, the signal control module generates and sends a low-frequency switch signal to the signal parameter detection module according to the start signal;

[0196] S103. The signal parameter detection module detects the signal parameters of the low-frequency switch signal, and generates and sends a frequency control signal to the frequency control module and a duty cycle control signal to the comparator module according to the signal parameters.

[0197] S104. The frequency control module generates and sends a frequency conversion voltage signal to the clock oscillation module according to the frequency control signal.

[0198] S105. The clock oscillation module generates and sends a frequency conversion signal to the comparator module according to the frequency conversion voltage signal.

[0199] S106. The comparator module generates and sends a frequency conversion switch signal to the peripheral boost module according to the duty cycle control signal and the frequency conversion signal.

[0200] S107. The peripheral boost module generates and outputs a frequency conversion power supply signal according to the frequency conversion switch signal.

[0201] When specifically implementing this embodiment, when the power control module detects the startup action of the circuit, specifically, the startup action of the telephone accessing the RJ11 port can be identified by the leaf switch installed at the telephone interface. The power control module circuit is turned on to supply power to the frequency control module and the peripheral boost module, and generates and sends a startup signal to the signal control module.

[0202] The signal control module generates and sends a low-frequency switch signal to the signal parameter detection module according to the startup signal. The low-frequency switch signal contains the switch information of the digital signal line.

[0203] The signal parameter detection module detects the signal parameters of the low-frequency switch signal, and generates a frequency control signal for the frequency control module according to the detected signal parameters, and changes the frequency of the low-frequency switch signal through the frequency control signal; generates a duty cycle control signal for the comparator module, and saves the switch information of the low-frequency switch signal through the duty cycle control signal.

[0204] The frequency control module generates a frequency conversion voltage signal for the clock oscillation module according to the frequency control signal. The frequency conversion voltage signal contains frequency conversion information.

[0205] 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 switch signal, specifically, it can be a multiple frequency signal of the low-frequency switch signal. The frequency of the frequency conversion signal is far from the working frequency band of the digital signal line. Therefore, it can avoid the switch noise of the power supply circuit from affecting the performance of the digital signal line.

[0206] The comparator module generates and sends a frequency conversion switch signal to the peripheral boost module according to the duty cycle control signal and the frequency conversion signal;

[0207] The peripheral boost module generates and outputs a frequency conversion power supply signal according to the frequency conversion switch signal.

[0208] The frequency conversion power supply signal is used to supply power to the digital signal line, and the frequency conversion power supply signal operates away from the working frequency band of the digital signal line, reducing the influence of the power supply signal on the digital signal line;

[0209] An embodiment of the present invention provides a method for generating a frequency conversion power supply signal for a digital signal line. When the power control module detects the startup action of the circuit, it supplies power to the frequency control module and the peripheral boost module; the signal parameter detection module detects the signal parameters of the low-frequency switch signal generated by the signal control module, and generates a frequency control signal and a duty cycle control signal according to the signal parameters; the frequency control module and the clock oscillation module generate a frequency conversion signal according to the frequency control signal, and the comparator module generates a frequency conversion switch signal according to the duty cycle control signal and the frequency conversion signal; the peripheral boost module generates and outputs a frequency conversion power supply signal according to the frequency conversion switch signal; the signal parameter detection module detects the parameters of the low-frequency switch signal, and generates a frequency conversion switch signal according to the detected parameters, and then outputs a frequency conversion power supply signal through the peripheral boost module to supply power to the digital signal line. The frequency conversion power supply signal has the switching information of the low-frequency switch signal and operates away from the working frequency band of the digital signal line, which can reduce switching noise and improve the performance of the digital signal line; the power control module identifies the startup action of the circuit and controls the power supply to the frequency control module and the peripheral boost module, which can control the power supply line to be in a silent state when there is no voice call requirement on the digital signal line, and no interference signal will be generated at this time; when the user has a voice call requirement, it supplies power to the corresponding modules of the power supply circuit, reducing the interference of the switch signal and reducing the power consumption of the power supply circuit;

[0210] In another embodiment provided by the present invention, the signal parameters specifically include frequency and duty cycle;

[0211] Step S103 specifically includes:

[0212] The signal parameter detection module calculates the number of pulse rising edges of the low-frequency switch signal within a preset time period to obtain the frequency of the low-frequency switch signal;

[0213] The signal parameter detection module obtains the high-potential time by detecting the time difference between adjacent rising edges and falling edges of the low-frequency switch signal, and calculates the duty cycle of the low-frequency switch signal according to the high-potential time and the frequency;

[0214] 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 cycle control signal to the comparator module according to the duty cycle;

[0215] The signal parameter detection module also controls, through its own reset control terminal, the re-detection of the signal parameters of the low-frequency switch signal.

[0216] In the specific implementation of this embodiment, the signal parameters include the frequency and duty cycle of the low-frequency switch signal;

[0217] The frequency is obtained by calculation of a counter of the signal parameter detection module, and the duty cycle signal is detected by a microcontroller of the signal parameter detection module. Specifically:

[0218] The signal parameter detection module detects the number of pulse rising edges of the low-frequency switch signal within 1 s by means of the counter, so as to obtain the frequency of the low-frequency switch signal;

[0219] The signal parameter detection module detects, by means of the microcontroller, the time difference between adjacent rising edges and falling edges of the low-frequency switch signal to obtain the high-potential time, calculates the period time of the low-frequency switch signal through the frequency, and calculates the duty cycle of the low-frequency switch signal according to the high-potential time and the period time;

[0220] 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 cycle control signal to the comparator module according to the duty cycle;

[0221] The signal parameter detection module also controls, through its own reset control terminal, the re-detection of the signal parameters of the low-frequency switch signal.

[0222] By detecting the frequency and duty cycle of the low-frequency switch signal through the signal parameter detection module, the switch information on the low-frequency switch signal can be detected. The frequency conversion power supply signal generated according to the duty cycle control signal has the switch information of the low-frequency switch signal and is far from the working frequency band of the digital signal line, can realize the switch function of the digital signal line, and can avoid the interference of switch noise.

[0223] In another embodiment provided by the present invention, the frequency control signal is several path potential control signals;

[0224] The step S104 specifically includes:

[0225] The frequency control module receives several path potential control signals and converts the several path potential control signals into a path of frequency conversion voltage signal;

[0226] The frequency control module sends the frequency conversion voltage signal to the clock oscillation module.

[0227] In the specific implementation of this embodiment, the frequency control signal is a plurality of potential control signals, and the plurality of circuit control signals include frequency information, specifically binary potential signals, and the frequency information is represented by high and low levels.

[0228] The frequency control module receives the plurality of potential control signals and converts the plurality of circuit control signals into a single frequency conversion voltage signal.

[0229] The frequency control module sends the frequency conversion voltage signal to the clock oscillation module.

[0230] In another embodiment provided by the present invention, step S105 specifically includes:

[0231] The clock oscillation module receives the frequency conversion voltage signal and controls the capacitance of the varactor diode of the clock oscillation module through the frequency conversion voltage signal.

[0232] The clock oscillation module controls the frequency of the frequency conversion signal through the capacitance of the varactor diode.

[0233] The clock oscillation module sends the frequency conversion signal to the comparator module.

[0234] In the specific implementation of this embodiment, the clock oscillation module receives the frequency conversion voltage signal, and changes the capacitance value of the varactor diode of the clock oscillation module through the voltage value of the frequency conversion voltage signal.

[0235] The clock oscillation module controls the capacitance value change of the oscillation circuit through the capacitance of the varactor diode to change the frequency of the frequency conversion signal.

[0236] The clock oscillation module sends the frequency conversion signal to the comparator module.

[0237] The frequency control module converts the plurality of potential control signals output by the signal parameter detection module into a single frequency conversion voltage signal, controls the clock oscillation module to output a frequency conversion signal, and outputs a frequency conversion signal whose frequency is far from the digital signal line, reducing the interference of the switching noise generated by the switching signal on the digital signal line.

[0238] In another embodiment provided by the present invention, the duty cycle of the frequency conversion switching signal is the same as the duty cycle of the low-frequency switching signal.

[0239] When the present embodiment is specifically implemented, the frequency conversion switch signal generated by the comparator module according to the frequency conversion signal and the duty cycle control signal has the same duty cycle as the low-frequency switch signal, has the switch information of the low-frequency switch signal generated by the signal control module, and can realize the switch function of the power supply for the digital signal line.

[0240] In another embodiment provided by the present invention, the method further includes:

[0241] Feedback the current information of the peripheral boost module to the signal control module through the feedback module of the power supply circuit;

[0242] Filter out the out-of-band interference signal of the low-frequency switch signal through the filter module of the power supply circuit, and send the filtered low-frequency switch signal to the signal parameter detection module.

[0243] When the present embodiment is specifically implemented, the power supply circuit further includes a feedback module and a filter module;

[0244] Feedback the current information of the peripheral boost module to the signal control module through the feedback module;

[0245] Filter out the out-of-band interference signal of the low-frequency switch signal through the filter module, and send the filtered low-frequency switch signal to the signal parameter detection module.

[0246] By feeding back the current information of the peripheral boost module to the signal control module, it is possible to detect the peripheral boost module and the output frequency conversion power supply signal, and monitor the performance of the power supply circuit; by filtering out the out-of-band interference signal of the low-frequency switch signal through the filter module, the interference caused by the switching noise to the output frequency conversion power supply signal of the power supply circuit is reduced, and the quality of the output frequency conversion power supply signal is improved.

[0247] A power supply circuit for a digital signal line and a method for generating a frequency conversion power supply signal thereof provided by the present invention include: a power supply control module, a signal control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module, and a peripheral boost module; detect the signal parameters of the low-frequency switch signal generated by the signal control module through the signal parameter detection module, and generate a frequency conversion switch signal according to the signal parameters; the peripheral boost module generates and outputs a frequency conversion power supply signal according to the frequency conversion switch signal; the frequency conversion power supply signal output by the circuit has the switch information of the low-frequency switch signal and is far from the working frequency band of the digital signal line, which can reduce the switching noise and improve the performance of the digital signal line; by identifying the circuit startup action through the power supply control module, it is possible to control the power supply line to be in a silent state when there is no voice call requirement on the digital signal line, reduce the interference of the switch signal, and reduce the power consumption of the power supply circuit.

[0248] It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A method for generating a frequency-converted power supply signal for a digital signal line, characterized in that, A power supply circuit applicable to a digital subscriber line, the power supply circuit comprising: A power control module, a signal control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module, and a peripheral boost module; The input end of the power control module is used to connect to the power supply of the power supply circuit, and the output end of the power control module is connected to the power supply end of the power supply circuit; The output end of the signal control module is connected to the input end of the signal parameter detection module, and the reset control end of the signal parameter detection module is used to connect to an external reset control signal; The first output end of the signal parameter detection module is connected to the control end of the frequency control module, the input end of the frequency control module is connected to the power supply end, the output end of the frequency control module is connected to the input end of the clock oscillation module, and the output end of the clock oscillation module is connected to the first input end of the comparator module; The second output end of the signal parameter detection module is connected to the second input end of the comparator module; The output end of the comparator module is connected to the control end of the peripheral boost module, the input end of the peripheral boost module is connected to the power supply end, and the output end of the peripheral boost module is used to output a power supply signal; The method includes: When the power control module detects the start-up action of the power supply circuit, it supplies power to the frequency control module and the peripheral boost module, generates and sends a start 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 start signal; The signal parameter detection module detects the signal parameters of the low-frequency switch signal, and according to the signal parameters, generates and sends a frequency control signal to the frequency control module, and generates and sends a duty cycle control signal to the comparator module; The frequency control module generates and sends a frequency-converted voltage signal to the clock oscillation module according to the frequency control signal; The clock oscillation module generates and sends a frequency-converted signal to the comparator module according to the frequency-converted voltage signal; The comparator module generates and sends a frequency-converted switch signal to the peripheral boost module according to the duty cycle control signal and the frequency-converted signal; The peripheral boost module generates and outputs a frequency-converted power supply signal according to the frequency-converted switch signal.

2. The method for generating a frequency-converted power supply signal for a digital signal line according to claim 1, wherein The signal parameters specifically include frequency and duty cycle; The signal parameter detection module detects the signal parameters of the low-frequency switch signal, and according to the signal parameters, generates and sends a frequency control signal to the frequency control module, and generates and sends a duty cycle control signal to the comparator module, specifically including: The signal parameter detection module calculates the number of pulse rising edges of the low-frequency switch signal within a preset time period to obtain the frequency of the low-frequency switch signal; The signal parameter detection module obtains the high-potential time by detecting the time difference between adjacent rising edges and falling edges of the low-frequency switch signal, and calculates the duty cycle of the low-frequency switch 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 cycle control signal to the comparator module according to the duty cycle; The signal parameter detection module also controls the re-detection of the signal parameters of the low-frequency switch signal through its own reset control terminal.

3. The method for generating a variable-frequency power supply signal for a digital signal line according to claim 1, wherein The frequency control signal is a plurality of potential control signals; The frequency control module generates and sends a frequency conversion voltage signal to the clock oscillation module according to the frequency control signal, specifically including: The frequency control module receives a plurality of the potential control signals and converts the plurality of the potential control signals into a single frequency conversion voltage signal; The frequency control module sends the frequency conversion voltage signal to the clock oscillation module.

4. The method for generating a variable-frequency power supply signal for a digital signal line according to claim 1, wherein The clock oscillation module generates and sends a frequency conversion signal to the comparator module according to the frequency conversion voltage signal, specifically including: The clock oscillation module receives the frequency conversion voltage signal and controls the capacitance of the varactor diode of the clock oscillation module through the frequency conversion voltage signal; The clock oscillation module controls the frequency of the frequency conversion signal through the capacitance of the varactor diode; The clock oscillation module sends the frequency conversion signal to the comparator module.

5. The method for generating a variable-frequency power supply signal for a digital signal line according to claim 1, wherein The duty cycle of the frequency conversion switch signal is the same as the duty cycle of the low-frequency switch signal.

6. The method for generating a variable-frequency power supply signal for a digital signal line according to claim 1, characterized in that, The method further includes: feeding back the current information of the peripheral boost module to the signal control module through the feedback module of the power supply circuit; filtering out the out-of-band interference signal of the low-frequency switch signal through the filter module of the power supply circuit and sending the filtered low-frequency switch signal to the signal parameter detection module.

7. A power supply circuit for a digital subscriber line, characterized in that, including: a power control module, a signal control module, a signal parameter detection module, a frequency control module, a clock oscillation module, a comparator module, and a peripheral boost module; The input end of the power control module is used to connect to the power supply of the power supply circuit, and the output end of the power control module is connected to the power supply end of the power supply circuit; The output end of the signal control module is connected to the input end of the signal parameter detection module, and the reset control end of the signal parameter detection module is used to connect to an external reset control signal; The first output end of the signal parameter detection module is connected to the control end of the frequency control module, the input end of the frequency control module is connected to the power supply end, the output end of the frequency control module is connected to the input end of the clock oscillation module, and the output end of the clock oscillation module is connected to the first input end of the comparator module; The second output end of the signal parameter detection module is connected to the second input end of the comparator module; The output end of the comparator module is connected to the control end of the peripheral boost module, the input end of the peripheral boost module is connected to the power supply end, and the output end of the peripheral boost module is used to output a power supply signal; The power supply circuit is used to execute the method for generating a frequency conversion power supply signal for a digital signal line according to any one of claims 1 to 6.

8. The power supply circuit of a digital subscriber line according to claim 7, characterized in that, The signal parameter detection module includes a counter and a microcontroller; The clock input terminal of the counter is connected to the input terminal of the signal parameter detection module. The n output terminals of the counter are sequentially connected to the first input / output terminal to the nth input / output terminal of the microcontroller. The reset terminal of the counter is connected to the first power supply through a current-limiting resistor, and the reset terminal of the counter is also connected to the reset control terminal of the signal parameter detection module; The (n + 1)th input / output terminal of the microcontroller is connected to the input terminal of the signal parameter detection module; the (n + 2)th input / output terminal of the microcontroller is connected to the first output terminal of the signal parameter detection module, and the (n + 3)th input / output terminal of the microcontroller is connected to the second output terminal of the signal parameter detection module, where n > 0.

9. The power supply circuit of a digital subscriber line according to claim 7, characterized in that, The frequency control module includes a switching transistor unit, a first band-pass filter unit, a second band-pass filter unit, a first capacitor, a first switch unit, a first field-effect transistor, a first resistor, a second resistor, and a first bidirectional voltage regulator diode; The first end of the first resistor is used to connect to the second power supply, and the first end of the first resistor is also connected to the first end of the first capacitor. The second end of the first capacitor is grounded; The second end of the first resistor is respectively connected to the input terminal of the switching transistor unit, the input terminal of the first band-pass filter unit, and the control terminal of the first switch unit. The output terminal of the first band-pass filter unit is grounded; The control terminal of the switching transistor unit is connected to the control terminal of the frequency control module, and the output terminal of the switching transistor unit is grounded; The first end of the second resistor is connected to the input terminal of the frequency control module, and the first end of the second resistor is also connected to the source electrode of the first field-effect transistor. The second end of the second resistor is respectively connected to the gate electrode of the first field-effect transistor and the input terminal of the first switch unit; the output terminal of the first switch unit is grounded; The drain electrode of the first field-effect transistor is respectively connected to the output terminal of the frequency control module, the input terminal of the second band-pass filter unit, and the first end of the first bidirectional voltage regulator diode. The second end of the second band-pass filter unit and the second end of the first bidirectional voltage regulator diode are both grounded.

10. The power supply circuit for a digital subscriber line according to claim 9, characterized in that, The first output terminal of the signal parameter detection module includes m output ports, the control terminal of the frequency control module includes m control ports, the switching transistor unit includes m control terminals, the output ports are connected to the control ports in one-to-one correspondence, and the control ports are connected to the control terminals of the switching transistor unit in one-to-one correspondence; The switching transistor unit includes m switching transistors. The input terminal of any one of the switching transistors is connected to the input terminal of the switching transistor unit. The control terminal of the switching transistor is connected to the control terminal of the switching transistor unit in one-to-one correspondence. The output terminal of any one of the switching transistors is connected to the output terminal of the switching transistor unit, where m > 0.

11. The power supply circuit for a digital subscriber line according to claim 7, characterized in that, 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 to connect to the third power supply, and the first end of the third resistor is also connected to the first end of the fourth resistor. The second end of the third resistor is respectively connected to 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 to the second end of the fourth resistor, and the output end of the second switch unit is respectively connected to the first end of the sixth resistor and the first end of the third capacitor; The second end of the fifth resistor, the second end of the sixth resistor, the second end of the third capacitor, and the second end of the second capacitor are all grounded; The negative electrode of the varactor diode is also connected to the input end of the clock oscillation module. The positive electrode of the varactor diode is connected to the first end of the first inductor. The second end of the first inductor is connected to the first end of the seventh resistor. The second end of the seventh resistor is connected to the output end of the second switch unit and the output end of the clock oscillation module.

12. The power supply circuit for a digital subscriber line according to claim 7, characterized in that, The comparator module includes a comparator and a second bidirectional voltage regulator tube; The first input end of the comparator module is connected to the inverting input end of the comparator, and the second input end of the comparator module is connected to 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 to the output end of the comparator module.

13. The power supply circuit for a digital subscriber line according to claim 7, characterized in that, The peripheral boost 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 switch unit, a first diode, a second diode, a third diode, and a fourth diode; Among them, the first end of the second inductor is respectively connected to the input end of the peripheral boost module, the input end of the third band-pass filtering unit, and the first end of the eighth resistor. The output end of the third band-pass filtering unit is grounded; The second end of the eighth resistor is connected to the first end of the fourth capacitor. The second end of the fourth capacitor is respectively connected to the second end of the second inductor, the first end of the fifth capacitor, the input end of the third switch unit, the positive electrode of the first diode, and the negative electrode of the second diode; The control end of the third switch unit is connected to the control end of the peripheral boost module; The second end of the fifth capacitor is respectively connected to the positive electrode of the third diode and the negative electrode of the fourth diode. The positive electrode of the fourth diode is respectively connected to the first end of the ninth resistor and the first end of the sixth capacitor. The second end of the sixth capacitor is respectively connected to the negative electrode of the third diode, the positive electrode of the second diode, and the first end of the seventh capacitor. The second end of the seventh capacitor is respectively connected to the output end of the third switch unit and the negative electrode of the first diode; The second end of the ninth resistor is connected to the output end of the peripheral boost module.

14. The power supply circuit for a digital subscriber line according to claim 13, characterized in that, The power supply circuit further includes a feedback module; The feedback module includes a resistor component and an eighth capacitor; The resistance component is composed of several resistors connected in parallel. The first end of the resistance component is connected to the first input end of the feedback module, and the first input end of the feedback module is connected to the output end of the third switch unit; The second end of the resistance component is connected to the first end of the eighth capacitor. The second end of the eighth capacitor is connected to the second input end of the feedback module, and the second input end of the feedback module is connected to the first end of the ninth resistor; The first end of the resistance component is connected to the first output end of the feedback module, and the first output end of the feedback module is connected to the first feedback end of the signal control module. The second end of the resistance component is connected to the second output end of the feedback module, and the second output end of the feedback module is connected to the second feedback end of the signal control module.

15. The power supply circuit for a digital subscriber line according to claim 7, characterized in that, The power supply control module includes a fourth switch unit, a ninth capacitor, a fourth band-pass filter unit, a tenth resistor, an eleventh resistor, a fifth switch unit, and a switch shrapnel; The input end of the power supply control module is respectively connected to the first end of the tenth resistor, the first end of the ninth capacitor, and the input end of the fourth switch unit; The second end of the tenth resistor is respectively connected to the second end of the ninth capacitor, the control end of the fourth switch unit, and the input end of the fifth switch unit. The output end of the fourth switch unit is respectively connected to the second end of the ninth capacitor, the input end of the fourth band-pass filter unit, and the output end of the power supply control module. The output end of the fourth band-pass filter unit is grounded; The output end of the fifth switch unit is grounded. The control end of the fifth switch unit is respectively connected to the first end of the eleventh resistor and the first end of the switch shrapnel. The second end of the switch shrapnel is grounded, and the second end of the eleventh resistor is used to connect to the fourth power supply; The switch shrapnel is installed at the phone interface.

16. The power supply circuit for a digital subscriber line according to claim 7, characterized in that, The power supply circuit further includes a fifth-order band-pass filter unit; The output end of the signal control module is connected to the input end of the signal parameter detection module. Specifically, the output end of the signal control module is connected to the input end of the fifth-order band-pass filter unit, and the output end of the fifth-order band-pass filter unit is connected to the input end of the signal parameter detection module.

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