An anti-jamming switching circuit

Abstract

The application discloses an anti-interference switching circuit, and relates to the technical field of switching anti-interference, which comprises a power control module, an output power regulating module, a frequency jittering module, and a peak value detecting module. The power control module is used for outputting a pulse signal, adjusting the pulse frequency according to the signal fed back by an output detecting module, and changing the frequency of the pulse signal according to the signal transmitted by a jittering adjusting module. The output power regulating module is used for power isolation adjustment, rectification filtering and output by the output module. The frequency jittering module is used for generating a triangular wave signal. The peak value detecting module is used for detecting the peak value of the pulse signal, judging the peak value condition by the jittering adjusting module, and adjusting the jittering percentage of the frequency jittering module. The anti-interference switching circuit adjusts the power output by the output power regulating module through the pulse signal output by the power control module, externally provides a triangular wave signal by the frequency jittering module, adjusts the frequency of the signal output by the power control module, detects the peak value of the pulse signal by the peak value detecting module, judges the peak value condition by the jittering adjusting module, and adjusts the jittering percentage.

Description

Technical Field

[0001] This invention relates to the field of switch anti-interference technology, specifically an anti-interference switch circuit. Background Technology

[0002] As the switching frequency of switching power supplies continues to increase, a large number of harmonic peak radiation components in the high-frequency switching waveform propagate outward, causing significant radiation interference. Currently, many power control chips use integrated PWM chips with built-in frequency dithering functions, allowing the switching frequency to change periodically within a small range, which helps reduce the amplitude of interference noise on the switching frequency. However, if existing switching power supply control chips do not have built-in frequency dithering circuitry, the switching circuit will be susceptible to external interference, and the switching power supply control chip cannot automatically adjust the dithering percentage when the pulse signal frequency is abnormal. Therefore, improvements are needed. Summary of the Invention

[0003] This invention provides an anti-interference switching circuit to solve the problems mentioned in the background art.

[0004] According to an embodiment of the present invention, an anti-interference switching circuit is provided, the anti-interference switching circuit comprising: a power supply module, a power control module, a power adjustment module, an output module, an output detection module, a frequency jitter module, a peak detection module, and a jitter adjustment module;

[0005] The power module is used to provide DC power;

[0006] The power control module is connected to the power supply module, the output detection module, and the jitter adjustment module. It is used to output a pulse signal and adjust the frequency of the pulse signal according to the signal fed back by the output detection module, and to change the frequency of the pulse signal according to the signal transmitted by the jitter adjustment module.

[0007] The power conditioning module is connected to the power module and the power control module. It is used to receive the pulse signal output by the power control module, perform DC-DC isolation regulation on the electrical energy transmitted by the power module, and output it to provide working power for the power control module.

[0008] The output module is connected to the power conditioning module and is used to rectify and filter the electrical energy output by the power conditioning module and then output it.

[0009] The output detection module is connected to the output module and the power regulation module. It is used to detect the voltage of the electrical energy output by the output module and feed the voltage signal back to the power control module. It is also used to detect the current of the power regulation module and feed the current signal back to the power control module.

[0010] The frequency dithering module is connected to the power supply module and is used to generate a triangular wave signal;

[0011] The peak detection module is connected to the power control module and is used to detect the peak value of the pulse signal output by the power adjustment module and output the peak value signal.

[0012] The jitter adjustment module is connected to the peak detection module and the frequency jitter module. It is used to perform threshold comparison on the peak signal and adjust the frequency of the triangular wave signal when the peak value is large. It is also used to transmit the triangular wave signal to the power control module.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The anti-interference switching circuit of the present invention consists of a power control module, a power supply module, a power regulation module, an output module, and an output detection module, forming a flyback switching power supply circuit. The power control module outputs a pulse signal to regulate the power output of the power regulation module, and an external frequency jitter module provides a triangular wave signal to regulate the frequency of the signal output by the power control module, thereby regulating the switching frequency of the power regulation module, reducing electromagnetic interference. The peak detection module detects the peak value of the pulse signal, and the jitter adjustment module judges the peak value and adjusts the jitter percentage to improve the anti-interference capability of the circuit. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic block diagram of an anti-interference switching circuit provided as an example of the present invention.

[0016] Figure 2 A circuit diagram of an anti-interference switching circuit is provided as an example of the present invention.

[0017] Figure 3 The connection circuit diagram of the peak detection module provided for an example of the present invention.

[0018] Figure 4 The connection circuit diagram of the jitter adjustment module provided in this embodiment of the invention is shown. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In one embodiment, see Figure 1 An anti-interference switching circuit includes: a power supply module 1, a power control module 2, a power adjustment module 3, an output module 4, an output detection module 5, a frequency jitter module 6, a peak detection module 7, and a jitter adjustment module 8.

[0021] Specifically, the power module 1 is used to provide DC power;

[0022] The power control module 2 is connected to the power supply module 1, the output detection module 5 and the jitter adjustment module 8. It is used to output a pulse signal and adjust the frequency of the pulse signal according to the signal fed back by the output detection module 5. It is also used to change the frequency of the pulse signal according to the signal transmitted by the jitter adjustment module 8.

[0023] The power conditioning module 3 is connected to the power module 1 and the power control module 2. It is used to receive the pulse signal output by the power control module 2 and perform DC-DC isolation regulation on the power energy transmitted by the power module 1 and output it to provide working power for the power control module 2.

[0024] Output module 4 is connected to the power conditioning module 3 and is used to rectify and filter the electrical energy output by the power conditioning module 3 and then output it.

[0025] The output detection module 5 is connected to the output module 4 and the power regulation module 3. It is used to detect the voltage of the electrical energy output by the output module 4 and feed the voltage signal back to the power control module 2. It is also used to detect the current of the power regulation module 3 and feed the current signal back to the power control module 2.

[0026] The frequency jitter module 6 is connected to the power supply module 1 and is used to generate a triangular wave signal;

[0027] Peak detection module 7, connected to the power control module 2, is used to detect the peak value of the pulse signal output by the power adjustment module and output the peak value signal.

[0028] The jitter adjustment module 8, connected to the peak detection module 7 and the frequency jitter module 6, is used to perform threshold comparison on the peak signal and adjust the frequency of the triangular wave signal when the peak value is large, and is used to transmit the triangular wave signal to the power control module 2.

[0029] In a specific embodiment, the power supply module 1 can be a power supply circuit to provide DC power; the power control module 2 can be a power control circuit composed of a PWM controller to provide pulse signals and adjust the frequency of the pulse signals and improve anti-interference capability based on the signals fed back by the output detection module 5 and the signals output by the jitter adjustment module 8; the power regulation module 3 can be a power regulation circuit composed of a high-frequency transformer and power switching transistors, etc., to adjust the switching frequency of the power switching transistors through the pulse signals output by the power control module 2, thereby completing the DC-DC regulation operation; the output module 4 can be an output circuit to regulate the regulated power. The output is rectified and filtered before being output; the output detection module 5 can use a voltage detection circuit and a current detection circuit to detect the voltage of the electrical energy output by the output module 4 and the current of the power regulation module 3, respectively; the frequency jitter module 6 can use a triangular wave oscillation circuit to provide a triangular wave signal; the peak detection module 7 can use a peak detection circuit to detect the peak value of the pulse signal output by the power control module 2; the jitter adjustment module 8 can use a peak comparison circuit and a jitter adjustment circuit, whereby the peak comparison circuit determines whether the peak value exceeds a set threshold, and if it does, controls the jitter adjustment circuit to adjust the percentage of jitter.

[0030] In another embodiment, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The power supply module 1 includes a DC power supply, a first capacitor C1, a first resistor R1, and a first Zener diode VD1; the power control module 2 includes a first controller U1.

[0031] Specifically, the DC power supply is connected to the first terminal of the first capacitor C1, the first terminal of the first resistor R1, and the input terminal of the first controller U1. The second terminal of the first resistor R1 is connected to the cathode of the first Zener diode VD1 and the frequency dithering module 6. The anode of the first Zener diode VD1 and the second terminal of the first capacitor C1 are both grounded.

[0032] In a specific embodiment, the first controller U1 described above may be selected from, but is not limited to, the LM5020 driver chip. Here, only the power supply terminal, input terminal, output terminal, current terminal, voltage terminal, and pulse terminal of the first controller U1 are described.

[0033] Furthermore, the power regulation module 3 includes a second diode D2, a first diode D1, a third diode D3, a first power transistor Q1, a first transformer W1, and a second capacitor C2; the output module 4 includes a fourth diode D4, a third capacitor C3, and an output port.

[0034] Specifically, the anode of the second diode D2 is connected to the first terminal of the first primary side of the first transformer W1 and the DC power supply; the second terminal of the first primary side of the first transformer W1 is connected to the anode of the third diode D3 and the drain of the first power transistor Q1; the cathode of the third diode D3 is connected to the cathode of the second diode D2; the source of the first power transistor Q1 is connected to the output detection module 5; the gate of the first power transistor Q1 is connected to the output terminal of the first controller U1; the first terminal of the second primary side of the first transformer W1 is connected to the anode of the first diode D1; the cathode of the first diode D1 is connected to the power supply terminal of the first controller U1 and grounded through the second capacitor C2; the second terminal of the second primary side of the first transformer W1 is grounded; the first terminal of the secondary side of the first transformer W1 is connected to the anode of the fourth diode D4; the cathode of the fourth diode D4 is connected to the first terminal of the output port and grounded through the third capacitor C3; and the second terminal of the secondary side of the first transformer W1 is connected to the second terminal of the output port.

[0035] In a specific embodiment, the first transformer W1 can be a high-frequency transformer, wherein the second primary side of the first transformer W1, together with the first diode D1 and the second capacitor C2, provides working power to the first controller U1; the first power transistor Q1 can be an N-channel enhancement-mode MOSFET to regulate the power transmitted by the first transformer W1; the fourth diode D4 and the third capacitor C3 realize the rectification and filtering of the power.

[0036] Furthermore, the output detection module 5 includes a second resistor R2, a third resistor R3, and a fourth resistor R4;

[0037] Specifically, one end of the second resistor R2 is connected to the first end of the output port, the other end of the second resistor R2 is connected to the voltage terminal of the first controller U1 and grounded through the third resistor R3, the first end of the fourth resistor R4 is connected to the source of the first power transistor Q1 and the current terminal of the first controller U1, and the second end of the fourth resistor R4 is grounded.

[0038] In a specific embodiment, the second resistor R2 and the third resistor R3 form a voltage detection circuit; the fourth resistor R4 forms a current detection circuit.

[0039] Furthermore, the frequency jitter module 6 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second comparator A2, a fourth capacitor C4, and a fifth capacitor C5;

[0040] Specifically, one end of the fifth resistor R5 is connected to the cathode of the first Zener diode VD1, the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and the non-inverting input of the second comparator A2 and grounded through the eighth resistor R8, the other end of the sixth resistor R6 is connected to the output of the second comparator A2 and connected through the seventh resistor R7 to the inverting input of the second comparator A2, one end of the fourth capacitor C4 and the first end of the fifth capacitor C5, the second end of the fifth capacitor C5 is connected to the jitter adjustment module 8, and the other end of the fourth capacitor C4 is grounded.

[0041] In a specific embodiment, the second comparator A2 can be an LMC7215, which, together with the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the fourth capacitor C4 and the fifth capacitor C5, forms a triangular wave oscillation circuit to provide a triangular wave signal.

[0042] Furthermore, the jitter adjustment module 8 includes a first comparator A1, a first switch VT1, a tenth resistor R10, a first power supply VCC1, a first analog switch U2, an eleventh resistor R11, a first potentiometer RP1, a first threshold device, and a twelfth resistor R12.

[0043] Specifically, the non-inverting input of the first comparator A1 is connected to the peak detection module 7, the inverting input of the first comparator A1 is connected to the first threshold device, the output of the first comparator A1 is connected to the base of the first switching transistor VT1 and the sixth terminal of the first analog switch U2, the second terminal of the first analog switch U2 is connected to the collector of the first switching transistor VT1 and connected to the first power supply VCC1 through the tenth resistor R10, the third and eighth terminals of the first analog switch U2 are both connected to the second terminal of the fifth capacitor C5, the fourth terminal of the first analog switch U2 is connected to the first terminal of the twelfth resistor R12, one terminal of the first potentiometer RP1 and the clock terminal of the first controller U1 through the eleventh resistor R11, the other terminal and the slider terminal of the first potentiometer RP1 are both connected to the ninth terminal of the first analog switch U2, and the emitter of the first switching transistor VT1 and the second terminal of the twelfth resistor R12 are both grounded.

[0044] In a specific embodiment, the first comparator A1 can be an LM393 comparator, which, together with the first threshold device, forms a peak comparison circuit, wherein the first threshold device provides a set peak threshold; the first analog switch U2 can be a CD4066 chip, which, together with the first switching transistor VT1, the tenth resistor R10, the first power supply VCC1, the first analog switch U2, the eleventh resistor R11, the first potentiometer RP1, and the twelfth resistor R12, forms a jitter adjustment circuit, wherein the first switching transistor VT1 can be an NPN transistor, the eleventh resistor R11 and the first potentiometer RP1 can both adjust the jitter percentage, and the twelfth resistor R12 sets the basic operating frequency of the jitter adjustment circuit.

[0045] Furthermore, the peak detection module 7 includes a second operational amplifier OP2, a fifth diode D5, a sixth diode D6, a sixth capacitor C6, a ninth resistor R9, and a first operational amplifier OP1;

[0046] Specifically, the non-inverting input of the second operational amplifier OP2 is connected to the output of the first controller U1, the inverting input of the second operational amplifier OP2 is connected to the anode of the fifth diode D5 and connected to the inverting input of the first operational amplifier OP1, the output of the first operational amplifier OP1 and the non-inverting input of the first comparator A1 through the ninth resistor R9, the anode of the fifth diode D5 is connected to the output of the second operational amplifier OP2 and the anode of the sixth diode D6, and the cathode of the sixth diode D6 is connected to the non-inverting input of the first operational amplifier OP1 and grounded through the sixth capacitor C6.

[0047] In a specific embodiment, both the second operational amplifier OP2 and the first operational amplifier OP1 can be selected as OPA350 operational amplifiers, which, together with the fifth diode D5, the sixth diode D6, the sixth capacitor C6 and the ninth resistor R9, form a peak detection circuit.

[0048] This invention discloses an anti-interference switching circuit powered by a DC power supply. A second resistor R2 and a third resistor R3 detect the voltage at the input and output ports, while a fourth resistor R4 detects the operating current of a first power transistor Q1. A first controller U1 adjusts the frequency of the output pulse signal based on the detected signal, thereby changing the conduction level and switching frequency of the first power transistor Q1 to achieve DC-DC regulation. Simultaneously, a second comparator A2, in conjunction with a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a fourth capacitor C4, and a fifth capacitor C5, forms a triangular wave oscillation circuit to provide a triangular wave signal. Since the first power supply VCC1 controls the first analog switch U2... When terminals three and four are turned on, the triangular wave signal is transmitted to the first controller U1 through the eleventh resistor R11 and the twelfth resistor R12, jittering the base frequency of the first controller U1. If the peak value of the pulse signal output by the first controller U1 changes and exceeds the set peak value threshold, the first comparator A1 will control the first switch VT1 to turn on, and control terminals eight and nine of the first analog switch U2 to turn on. Then, the triangular wave signal is transmitted to the first controller U1 through the first potentiometer RP1 and the twelfth resistor R12. The percentage of jitter can be adjusted by adjusting the first potentiometer RP1, thereby adjusting the jitter effect and the anti-interference capability of the first power transistor Q1.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An anti-interference switching circuit, characterized in that, The anti-interference switching circuit includes: a power supply module, a power control module, a power adjustment module, an output module, an output detection module, a frequency jitter module, a peak detection module, and a jitter adjustment module; The power module is used to provide DC power; The power control module is connected to the power supply module, the output detection module, and the jitter adjustment module. It is used to output a pulse signal and adjust the frequency of the pulse signal according to the signal fed back by the output detection module, and to change the frequency of the pulse signal according to the signal transmitted by the jitter adjustment module. The power conditioning module is connected to the power module and the power control module. It is used to receive the pulse signal output by the power control module, perform DC-DC isolation regulation on the electrical energy transmitted by the power module, and output it to provide working power for the power control module. The output module is connected to the power conditioning module and is used to rectify and filter the electrical energy output by the power conditioning module and then output it. The output detection module is connected to the output module and the power regulation module. It is used to detect the voltage of the electrical energy output by the output module and feed the voltage signal back to the power control module. It is also used to detect the current of the power regulation module and feed the current signal back to the power control module. The frequency dithering module is connected to the power supply module and is used to generate a triangular wave signal; The peak detection module is connected to the power control module and is used to detect the peak value of the pulse signal output by the power control module and output the peak value signal. The jitter adjustment module is connected to the peak detection module and the frequency jitter module, and is used to perform threshold comparison on the peak signal and adjust the frequency of the triangular wave signal when the peak value is large, and to transmit the triangular wave signal to the power control module. The power supply module includes a DC power supply, a first capacitor, a first resistor, and a first Zener diode; the power control module includes a first controller. The DC power supply is connected to the first terminal of the first capacitor, the first terminal of the first resistor, and the input terminal of the first controller. The second terminal of the first resistor is connected to the cathode of the first Zener diode and the frequency dithering module. The anode of the first Zener diode and the second terminal of the first capacitor are both grounded. The frequency dithering module includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second comparator, a fourth capacitor, and a fifth capacitor; One end of the fifth resistor is connected to the cathode of the first Zener diode, the other end of the fifth resistor is connected to one end of the sixth resistor and the non-inverting input of the second comparator and grounded through the eighth resistor, the other end of the sixth resistor is connected to the output of the second comparator and connected through the seventh resistor to the inverting input of the second comparator, one end of the fourth capacitor and the first end of the fifth capacitor, the second end of the fifth capacitor is connected to the jitter adjustment module, and the other end of the fourth capacitor is grounded. The jitter adjustment module includes a first comparator, a first switching transistor, a tenth resistor, a first power supply, a first analog switch, an eleventh resistor, a first potentiometer, a first threshold device, and a twelfth resistor. The non-inverting input of the first comparator is connected to the peak detection module, the inverting input of the first comparator is connected to the first threshold device, the output of the first comparator is connected to the base of the first switching transistor and the sixth terminal of the first analog switch, the second terminal of the first analog switch is connected to the collector of the first switching transistor and connected to the first power supply through the tenth resistor, the third and eighth terminals of the first analog switch are both connected to the second terminal of the fifth capacitor, the fourth terminal of the first analog switch is connected to the first terminal of the twelfth resistor, one terminal of the first potentiometer and the clock terminal of the first controller through the eleventh resistor, the other terminal and the slider terminal of the first potentiometer are both connected to the ninth terminal of the first analog switch, and the emitter of the first switching transistor and the second terminal of the twelfth resistor are both grounded.

2. The anti-interference switching circuit according to claim 1, characterized in that, The power regulation module includes a second diode, a first diode, a third diode, a first power transistor, a first transformer, and a second capacitor; the output module includes a fourth diode, a third capacitor, and an output port. The anode of the second diode is connected to the first terminal of the first primary side of the first transformer and the DC power supply. The second terminal of the first primary side of the first transformer is connected to the anode of the third diode and the drain of the first power transistor. The cathode of the third diode is connected to the cathode of the second diode. The source of the first power transistor is connected to the output detection module. The gate of the first power transistor is connected to the output terminal of the first controller. The first terminal of the second primary side of the first transformer is connected to the anode of the first diode. The cathode of the first diode is connected to the power supply terminal of the first controller and grounded through the second capacitor. The second terminal of the second primary side of the first transformer is grounded. The first terminal of the secondary side of the first transformer is connected to the anode of the fourth diode. The cathode of the fourth diode is connected to the first terminal of the output port and grounded through the third capacitor. The second terminal of the secondary side of the first transformer is connected to the second terminal of the output port.

3. The anti-interference switching circuit according to claim 2, characterized in that, The output detection module includes a second resistor, a third resistor, and a fourth resistor; One end of the second resistor is connected to the first end of the output port, the other end of the second resistor is connected to the voltage terminal of the first controller and grounded through the third resistor, the first end of the fourth resistor is connected to the source of the first power transistor and the current terminal of the first controller, and the second end of the fourth resistor is grounded.

4. The anti-interference switching circuit according to claim 3, characterized in that, The peak detection module includes a second operational amplifier, a fifth diode, a sixth diode, a sixth capacitor, a ninth resistor, and a first operational amplifier; The non-inverting input of the second operational amplifier is connected to the output of the first controller. The inverting input of the second operational amplifier is connected to the anode of the fifth diode and is connected to the inverting input of the first operational amplifier, the output of the first operational amplifier, and the non-inverting input of the first comparator through the ninth resistor. The anode of the fifth diode is connected to the output of the second operational amplifier and the anode of the sixth diode. The cathode of the sixth diode is connected to the non-inverting input of the first operational amplifier and is grounded through the sixth capacitor.

Images