Miniaturized multi-path filter circuit

Abstract

The utility model relates to multi -way input equipment technical field especially relates to a miniaturization multi -way filter circuit, including multi -way filter integrated module, multi -way switch module, switch control module, voltage sampling module and single computer piece, the multi -way filter integrated module is connected through multi -way switch module and inputs the interface, switch control module is connected with multi -way switch module, is used for controlling the switch of a certain road in multi -way switch module opens, voltage sampling module inputs the interface, is used for sampling the input voltage of each road, single computer piece is connected with switch control module and voltage sampling module respectively, is used for according to voltage sampling module's input voltage control switch control module that samples, the utility model provides a circuit design simple, size miniaturization, and cost minimization's miniaturization multi -way filter circuit.

Description

Technical Field

[0001] This utility model relates to the field of multi-input device technology, and in particular to a miniaturized multi-channel filter circuit. Background Technology

[0002] In power supply systems, multi-input devices are commonly used to power different loads. To ensure that each input in a multi-input device meets electromagnetic compatibility requirements, most current designs use a separate filter for each input, resulting in high cost and large size. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a miniaturized multi-channel filter circuit with simple circuit design, small size and minimized cost.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a miniaturized multi-channel filter circuit, including a multi-channel filter integrated module, a multi-channel switch module, a switch control module, a voltage sampling module, and a single-chip microcomputer; the multi-channel filter integrated module is connected to the input interface through the multi-channel switch module; the switch control module is connected to the multi-channel switch module and is used to control the switch of a certain channel in the multi-channel switch module to open; the voltage sampling module is connected to the input interface and is used to sample the input voltage of each channel; the single-chip microcomputer is connected to both the switch control module and the voltage sampling module and is used to control the switch control module according to the input voltage sampled by the voltage sampling module.

[0005] Furthermore, the multi-channel filter integrated module includes a multi-wire inductor L1, capacitors C1, C4, and C7; terminal 1 of the multi-wire inductor L1 is connected to the input interface through the multiplexer module, and terminal 4 is also connected to the input interface; terminals 5 and 6 of the multi-wire inductor L1 are connected to the output interface; one end of capacitor C1 is grounded, and the other end is connected to the common terminal of the multi-wire inductor L1 and the multiplexer module; one end of capacitor C4 is connected to the common terminal of the multi-wire inductor L1 and the multiplexer module, and the other end is connected to terminals 2, 3, and 4 of the multi-wire inductor L1, respectively; one end of capacitor C7 is grounded, and the other end is connected to terminal 4 of the multi-wire inductor L1.

[0006] Furthermore, the multiplexer module includes control switches S1, S2, and S3; the terminals 1 of the multi-wire inductor L1 are connected to the input interface through control switches S1, S2, and S3 respectively, and the control switches S1, S2, and S3 are controlled by the switch control module.

[0007] Furthermore, the switch control module includes a first switch control sub-circuit, a second switch control sub-circuit, and a third switch control sub-circuit; the first switch control sub-circuit, the second switch control sub-circuit, and the third switch control sub-circuit are respectively connected to a single chip; the first switch control sub-circuit is connected to both ends of the control switch S1, the second switch control sub-circuit is connected to both ends of the control switch S2, and the third switch control sub-circuit is connected to both ends of the control switch S3.

[0008] Furthermore, the first, second, and third switch control sub-circuits each include a transistor Q1, diodes D1 and D2, a capacitor C11, and resistors R5, R15, and R17. The base of transistor Q1 is connected to the chip via resistor R15, and its emitter is grounded. One end of resistor R17 is connected to the common terminal of transistor Q1 and resistor R15, and its other end is grounded. Capacitor C11 is connected in parallel with resistor R17, and the collector of transistor Q1 is connected to the power supply via diode D2, resistor R5, and diode D1 in sequence. In the first switch control sub-circuit, diode D2 is connected in parallel with control switch S1; in the second switch control sub-circuit, diode D2 is connected in parallel with control switch S2; and in the third switch control sub-circuit, diode D2 is connected in parallel with control switch S3.

[0009] Furthermore, the voltage sampling module includes a first voltage sampling sub-circuit, a second voltage sampling sub-circuit, and a third voltage sampling sub-circuit; the single-chip microcomputer is connected to the input interface through the first voltage sampling sub-circuit, the second voltage sampling sub-circuit, and the third voltage sampling sub-circuit, respectively.

[0010] Further, the first voltage sampling sub-circuit, the second voltage sampling sub-circuit, and the third voltage sampling sub-circuit each include an operational amplifier D3, a transformer T1, a diode D4, capacitors C9 and C10, and resistors R61, R62, R9, and R12; pin 5 of the operational amplifier D3 is connected to terminal 3 of the transformer T1, and pin 6 is connected to terminal 4 of the transformer T1; one end of the capacitor C10 is connected to pin 5 of the operational amplifier D3, and the other end is connected to pin 6 of the operational amplifier D3; capacitor C9, resistors R9 and R12 are connected in sequence to form a loop, the common terminal of resistors R9 and R12 is connected to pin 8 of the operational amplifier D3, and the common terminal of capacitor C9 and resistor R9 is connected to the single-chip microcomputer; one end of the diode D4 is connected to the common terminal of capacitor C9 and resistor R12, and the other end is connected to the common terminal of resistors R9 and R12; terminal 1 of the transformer T1 is connected to the input interface, and terminal 2 of the transformer T1 is connected to the input interface through resistor R61; resistor R62 is connected in parallel with resistor R61.

[0011] Further, the first voltage sampling sub-circuit, the second voltage sampling sub-circuit, and the third voltage sampling sub-circuit all further include diode V1, capacitors C8, C12, C13, C14, C15, C16, resistors R2, R3, R4, R7, R8, R10, R11, R13, R14, R16, R18, R19, R20, R21, R22, and resistor array RP1; pin 1 of the operational amplifier D3 is connected to pin 2 of the operational amplifier D3 through diode V1, and pin 5 is connected to pin 8 of the operational amplifier D3 in sequence through resistors R8, R2, R3, R4, R16, and R19; pin 8 of the operational amplifier D3 is connected to pin 12 of the operational amplifier D3 in sequence through capacitor C12, resistors R13, R7, R11, and R10; one end of capacitor C8 is connected to the common terminal of resistors R2 and R8, and the other end is connected to pin 5 of the operational amplifier D3 through resistor R20. The capacitor C15 is connected in parallel with the resistor R20; one end of the resistor R14 is connected to pin 10 of the operational amplifier D3, and the other end is connected to the common terminal of the capacitor C12 and the resistor R13; one end of the capacitor C13 is connected to pin 10 of the operational amplifier D3, and the other end is connected to the common terminal of the capacitor C8 and the resistor R20; one end of the capacitor C16 is connected to the common terminal of the resistor R10 and the resistor R11, and the other end is connected to pin 6 of the operational amplifier D3 through the capacitor C14; one end of the resistor array RP1 is connected to the common terminal of the capacitor C14 and the capacitor C16, and the other end is connected to pin 6 of the operational amplifier D3 through the resistor R18; one end of the resistor R21 is connected to pin 8 of the operational amplifier D3, and the other end is connected to the common terminal of the capacitor C8 and the resistor R20; one end of the resistor R22 is connected to the common terminal of the resistor R10 and the resistor R11, and the other end is connected to the common terminal of the capacitor C8 and the resistor R20.

[0012] The beneficial effects of this utility model are:

[0013] This invention integrates multiple input filters into a single multi-channel filter module, achieving miniaturization and cost reduction. A multi-channel switch module connects multiple inputs to the multi-channel filter module, and a voltage sampling module samples the input voltage of each channel to determine its normality. Finally, a switch control module controls the opening of a specific switch in the multi-channel switch module, ensuring that only one input is connected to the multi-channel filter module. This avoids mutual coupling between inductors and meets electromagnetic compatibility requirements. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a framework diagram of the present invention;

[0016] Figure 2 This is the circuit schematic diagram of the multi-channel filter integrated module in this utility model;

[0017] Figure 3 This is the circuit diagram of the first switch control sub-circuit in this utility model;

[0018] Figure 4 This is a circuit diagram of the first voltage sampling sub-circuit in this utility model;

[0019] Figure 5 This is the circuit schematic diagram of the single-chip microcomputer in this utility model.

[0020] In the diagram: 100, multi-channel filter integrated module; 200, multi-channel switch module; 300, switch control module; 400, voltage sampling module; 500, single-chip microcomputer. Detailed Implementation

[0021] The present invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0022] like Figure 1 As shown, a miniaturized multi-channel filter circuit includes a multi-channel filter integrated module 100, a multi-channel switch module 200, a switch control module 300, a voltage sampling module 400, and a single-chip microcomputer 500. The multi-channel filter integrated module 100 is connected to an input interface through the multi-channel switch module 200. The switch control module 300 is connected to the multi-channel switch module 200 and is used to control the switch of a certain channel in the multi-channel switch module 200 to open. The voltage sampling module 400 is connected to the input interface and is used to sample the input voltage of each channel. The single-chip microcomputer 500 is connected to both the switch control module 300 and the voltage sampling module 400 and is used to control the switch control module 300 according to the input voltage sampled by the voltage sampling module 400.

[0023] The multi-channel filter integration module 100 integrates multiple input filters together, achieving miniaturization and cost reduction. The multi-channel switch module 200 connects multiple inputs to the multi-channel filter integration module 100. The voltage sampling module 400 samples the input voltage of each channel to determine whether the input voltage of each channel is normal. Finally, the switch control module 300 controls the switch of one channel in the multi-channel switch module 200 to open, so that only one input is connected to the multi-channel filter integration module 100, thereby avoiding mutual coupling of inductors and meeting electromagnetic compatibility performance requirements.

[0024] like Figure 2As shown, the multi-channel filter integrated module 100 includes a multi-wire inductor L1, capacitors C1, C4, and C7. Terminal 1 of the multi-wire inductor L1 is connected to the input interface via the multiplexer module 200, and terminal 4 is also connected to the input interface. Terminals 5 and 6 of the multi-wire inductor L1 are connected to the output interface. One end of capacitor C1 is grounded, and the other end is connected to the common terminal of the multi-wire inductor L1 and the multiplexer module 200. One end of capacitor C4 is connected to the common terminal of the multi-wire inductor L1 and the multiplexer module 200, and the other end is connected to terminals 2, 3, and 4 of the multi-wire inductor L1, respectively. One end of capacitor C7 is grounded, and the other end is connected to terminal 4 of the multi-wire inductor L1. Specifically, the multi-wire inductor L1 has multiple input wires wound together on the same magnetic core, reducing the size and cost of the inductor. Specifically, capacitors C1 and C7 are Y capacitors, used to transmit high-frequency interference signals to the ground and prevent interference.

[0025] like Figure 2 As shown, the multiplexer module 200 includes control switches S1, S2, and S3; the terminals 1 of the multi-wire wound inductor L1 are connected to the input interface through control switches S1, S2, and S3 respectively, and the control switches S1, S2, and S3 are controlled by the switch control module 300. Specifically, each control switch corresponds to one input.

[0026] The switch control module 300 includes a first switch control sub-circuit, a second switch control sub-circuit, and a third switch control sub-circuit; the first switch control sub-circuit, the second switch control sub-circuit, and the third switch control sub-circuit are respectively connected to the single-chip microcomputer 500; the first switch control sub-circuit is connected to both ends of the control switch S1, the second switch control sub-circuit is connected to both ends of the control switch S2, and the third switch control sub-circuit is connected to both ends of the control switch S3.

[0027] like Figure 3 As shown, the first, second, and third switch control sub-circuits each include a transistor Q1, diodes D1 and D2, a capacitor C11, and resistors R5, R15, and R17. The base of transistor Q1 is connected to the single-chip 500 through resistor R15, and its emitter is grounded. One end of resistor R17 is connected to the common terminal of transistor Q1 and resistor R15, and its other end is grounded. Capacitor C11 is connected in parallel with resistor R17, and the collector of transistor Q1 is connected to the power supply through diode D2, resistor R5, and diode D1 in sequence. In the first switch control sub-circuit, diode D2 is connected in parallel with control switch S1; in the second switch control sub-circuit, diode D2 is connected in parallel with control switch S2; and in the third switch control sub-circuit, diode D2 is connected in parallel with control switch S3.

[0028] The voltage sampling module 400 includes a first voltage sampling sub-circuit, a second voltage sampling sub-circuit, and a third voltage sampling sub-circuit; the single-chip microcomputer 500 is connected to the input interface through the first voltage sampling sub-circuit, the second voltage sampling sub-circuit, and the third voltage sampling sub-circuit, respectively. Specifically, the first voltage sampling sub-circuit corresponds to one input corresponding to control switch S1; the second voltage sampling sub-circuit corresponds to one input corresponding to control switch S2; and the third voltage sampling sub-circuit corresponds to one input corresponding to control switch S3.

[0029] like Figure 4 As shown, the first, second, and third voltage sampling sub-circuits each include an operational amplifier D3, a transformer T1, a diode D4, capacitors C9 and C10, and resistors R61, R62, R9, and R12. Pin 5 of the operational amplifier D3 is connected to terminal 3 of the transformer T1, and pin 6 is connected to terminal 4 of the transformer T1. One end of capacitor C10 is connected to pin 5 of the operational amplifier D3, and the other end is connected to pin 6 of the operational amplifier D3. Capacitor C9, resistors R9 and R12 are connected in sequence to form a loop. The common terminal of resistors R9 and R12 is connected to pin 8 of the operational amplifier D3, and the common terminal of capacitor C9 and resistor R9 is connected to the single-chip 500. One end of diode D4 is connected to the common terminal of capacitor C9 and resistor R12, and the other end is connected to the common terminal of resistors R9 and R12. Terminal 1 of the transformer T1 is connected to the input interface, and terminal 2 is connected to the input interface through resistor R61. Resistor R62 is connected in parallel with resistor R61.

[0030] like Figure 4As shown, the first voltage sampling sub-circuit, the second voltage sampling sub-circuit, and the third voltage sampling sub-circuit all further include diode V1, capacitors C8, C12, C13, C14, C15, C16, resistors R2, R3, R4, R7, R8, R10, R11, R13, R14, R16, R18, R19, R20, R21, R22, and resistor array RP1; pin 1 of operational amplifier D3 is connected to pin 2 of operational amplifier D3 through diode V1, and its pin 5 is connected to pin 8 of operational amplifier D3 in sequence through resistors R8, R2, R3, R4, R16, and R19; pin 8 of operational amplifier D3 is connected to pin 12 of operational amplifier D3 in sequence through capacitor C12, resistors R13, R7, R11, and R10; one end of capacitor C8 is connected to the common terminal of resistors R2 and R8, and its other end is connected to pin 12 of operational amplifier D3 through resistor R20. Pin 5; Capacitor C15 is connected in parallel with resistor R20; One end of resistor R14 is connected to pin 10 of operational amplifier D3, and its other end is connected to the common terminal of capacitor C12 and resistor R13; One end of capacitor C13 is connected to pin 10 of operational amplifier D3, and its other end is connected to the common terminal of capacitor C8 and resistor R20; One end of capacitor C16 is connected to the common terminal of resistor R10 and resistor R11, and its other end is connected to pin 6 of operational amplifier D3 through capacitor C14; One end of resistor array RP1 is connected to the common terminal of capacitor C14 and C16, and its other end is connected to pin 6 of operational amplifier D3 through resistor R18; One end of resistor R21 is connected to pin 8 of operational amplifier D3, and its other end is connected to the common terminal of capacitor C8 and resistor R20; One end of resistor R22 is connected to the common terminal of resistor R10 and resistor R11, and its other end is connected to the common terminal of capacitor C8 and resistor R20.

[0031] like Figure 5 As shown, the single-chip 500 includes chip U1; pin 37 of chip U1 is connected to the first switch control sub-circuit, pin 38 is connected to the second switch control sub-circuit, and pin 39 is connected to the third switch control sub-circuit; pin 8 of chip U1 is connected to the first voltage sampling sub-circuit, pin 9 is connected to the second voltage sampling sub-circuit, and pin 10 is connected to the third voltage sampling sub-circuit.

[0032] During operation, the single-chip 500 samples the input voltage of each channel through the voltage sampling module 400 to determine whether each input voltage is within the normal range. If each input voltage is within the normal range, the single-chip 500 uses the switch control module 300 to turn on the switch with the highest power supply priority in the multi-channel switch module 200 according to the preset power supply priority.

[0033] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A miniaturized multi-channel filter circuit, characterized in that: The system includes a multi-channel filtering integrated module (100), a multi-channel switch module (200), a switch control module (300), a voltage sampling module (400), and a single-chip microcomputer (500). The multi-channel filtering integrated module (100) is connected to the input interface through the multi-channel switch module (200). The switch control module (300) is connected to the multi-channel switch module (200) and is used to control the switch of a certain channel in the multi-channel switch module (200) to open. The voltage sampling module (400) is connected to the input interface and is used to sample the input voltage of each channel. The single-chip microcomputer (500) is connected to both the switch control module (300) and the voltage sampling module (400) and is used to control the switch control module (300) according to the input voltage sampled by the voltage sampling module (400).

2. The miniaturized multi-channel filter circuit according to claim 1, characterized in that: The multi-channel filter integrated module (100) includes a multi-wire inductor L1, capacitors C1, C4, and C7; terminal 1 of the multi-wire inductor L1 is connected to the input interface through the multiplexer module (200), and terminal 4 is also connected to the input interface; terminals 5 and 6 of the multi-wire inductor L1 are connected to the output interface; one end of capacitor C1 is grounded, and the other end is connected to the common terminal of the multi-wire inductor L1 and the multiplexer module (200); one end of capacitor C4 is connected to the common terminal of the multi-wire inductor L1 and the multiplexer module (200), and the other end is connected to terminals 2, 3, and 4 of the multi-wire inductor L1 respectively; one end of capacitor C7 is grounded, and the other end is connected to terminal 4 of the multi-wire inductor L1.

3. The miniaturized multi-channel filter circuit according to claim 2, characterized in that: The multiplexer module (200) includes control switches S1, S2 and S3; the terminals 1 of the multi-wire inductor L1 are connected to the input interface through control switches S1, S2 and S3 respectively, and the control switches S1, S2 and S3 are controlled by the switch control module (300).

4. The miniaturized multi-channel filter circuit according to claim 3, characterized in that: The switch control module (300) includes a first switch control sub-circuit, a second switch control sub-circuit, and a third switch control sub-circuit; the first switch control sub-circuit, the second switch control sub-circuit, and the third switch control sub-circuit are respectively connected to a single chip (500); the first switch control sub-circuit is connected to both ends of the control switch S1, the second switch control sub-circuit is connected to both ends of the control switch S2, and the third switch control sub-circuit is connected to both ends of the control switch S3.

5. The miniaturized multi-channel filter circuit according to claim 4, characterized in that: The first, second, and third switch control sub-circuits each include a transistor Q1, diodes D1 and D2, a capacitor C11, and resistors R5, R15, and R17. The base of transistor Q1 is connected to the single-chip microcomputer (500) through resistor R15, and its emitter is grounded. One end of resistor R17 is connected to the common terminal of transistor Q1 and resistor R15, and its other end is grounded. Capacitor C11 is connected in parallel with resistor R17, and the collector of transistor Q1 is connected to the power supply through diode D2, resistor R5, and diode D1 in sequence. In the first switch control sub-circuit, diode D2 is connected in parallel with control switch S1; in the second switch control sub-circuit, diode D2 is connected in parallel with control switch S2; and in the third switch control sub-circuit, diode D2 is connected in parallel with control switch S3.

6. The miniaturized multi-channel filter circuit according to claim 3, characterized in that: The voltage sampling module (400) includes a first voltage sampling sub-circuit, a second voltage sampling sub-circuit, and a third voltage sampling sub-circuit; the single-chip microcomputer (500) is connected to the input interface through the first voltage sampling sub-circuit, the second voltage sampling sub-circuit, and the third voltage sampling sub-circuit, respectively.

7. The miniaturized multi-channel filter circuit according to claim 6, characterized in that: The first, second, and third voltage sampling sub-circuits each include an operational amplifier D3, a transformer T1, a diode D4, capacitors C9 and C10, and resistors R61, R62, R9, and R12. Pin 5 of the operational amplifier D3 is connected to terminal 3 of the transformer T1, and pin 6 is connected to terminal 4 of the transformer T1. One end of capacitor C10 is connected to pin 5 of the operational amplifier D3, and the other end is connected to pin 6 of the operational amplifier D3. Capacitor C9... Resistors R9 and R12 are connected in sequence to form a circuit. The common terminal of resistors R9 and R12 is connected to pin 8 of operational amplifier D3. The common terminal of capacitor C9 and resistor R9 is connected to the single-chip microcomputer (500). One end of diode D4 is connected to the common terminal of capacitor C9 and resistor R12, and the other end is connected to the common terminal of resistors R9 and R12. Terminal 1 of transformer T1 is connected to the input interface, and terminal 2 of transformer T1 is connected to the input interface through resistor R61. Resistor R62 is connected in parallel with resistor R61.

8. The miniaturized multi-channel filter circuit according to claim 7, characterized in that: The first, second, and third voltage sampling sub-circuits all further include diode V1, capacitors C8, C12, C13, C14, C15, C16, resistors R2, R3, R4, R7, R8, R10, R11, R13, R14, R16, R18, R19, R20, R21, R22, and resistor array RP1; pin 1 of operational amplifier D3 is connected to pin 2 of operational amplifier D3 through diode V1, and pin 5 is connected to pin 8 of operational amplifier D3 sequentially through resistors R8, R2, R3, R4, R16, and R19; pin 8 of operational amplifier D3 is connected to pin 12 of operational amplifier D3 sequentially through capacitor C12, resistors R13, R7, R11, and R10; one end of capacitor C8 is connected to the common terminal of resistors R2 and R8, and the other end is connected to pin 5 of operational amplifier D3 through resistor R20; The capacitor C15 is connected in parallel with the resistor R20; one end of the resistor R14 is connected to pin 10 of the operational amplifier D3, and the other end is connected to the common terminal of the capacitor C12 and the resistor R13; one end of the capacitor C13 is connected to pin 10 of the operational amplifier D3, and the other end is connected to the common terminal of the capacitor C8 and the resistor R20; one end of the capacitor C16 is connected to the common terminal of the resistor R10 and the resistor R11, and the other end is connected to pin 6 of the operational amplifier D3 through the capacitor C14; one end of the resistor array RP1 is connected to the common terminal of the capacitors C14 and C16, and the other end is connected to pin 6 of the operational amplifier D3 through the resistor R18; one end of the resistor R21 is connected to pin 8 of the operational amplifier D3, and the other end is connected to the common terminal of the capacitor C8 and the resistor R20; one end of the resistor R22 is connected to the common terminal of the resistors R10 and R11, and the other end is connected to the common terminal of the capacitor C8 and the resistor R20.

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