阅读说明：本技术 一种高频滤波电路 (High-frequency filter circuit ) 是由 林浩 张廉 唐会杰 夏银水 林丰成 于 2021-05-07 设计创作，主要内容包括：本发明涉及一种滤波电路,具体地说,涉及一种高频滤波电路。其包括电源电路、中和电容电路、一级滤波电路、二级滤波电路和稳压电路,电源电路用于给中和电容电路、一级滤波电路、二级滤波电路和稳压电路提供电能,一级滤波电路、二级滤波电路并联,中和电容电路、稳压电路和并联的一级滤波电路、二级滤波电路串联；一级滤波电路包括电容C6、C7、C8,运算放大器B1,电感线圈E1、E2、E3、E4,二级滤波电路包括电阻R6、R7、R8、R9、R10、R11、R12、R13,电容C9、C10、C11、C12,运算放大器B2、B3。本发明中通过二级滤波电路对电路中的低频干扰进行阻止,并将低频干扰去除,减少低频干扰在电路中的传输,避免低频干扰对人体的影响,从而保护人体的健康。(The present invention relates to a filter circuit, and more particularly, to a high frequency filter circuit. The power supply circuit is used for providing electric energy for the neutralization capacitor circuit, the first-stage filter circuit, the second-stage filter circuit and the voltage stabilizing circuit, the first-stage filter circuit and the second-stage filter circuit are connected in parallel, and the neutralization capacitor circuit and the voltage stabilizing circuit are connected in series with the first-stage filter circuit and the second-stage filter circuit which are connected in parallel; the primary filter circuit comprises capacitors C6, C7 and C8, an operational amplifier B1, inductors E1, E2, E3 and E4, and the secondary filter circuit comprises resistors R6, R7, R8, R9, R10, R11, R12 and R13, capacitors C9, C10, C11 and C12, and operational amplifiers B2 and B3. According to the invention, the low-frequency interference in the circuit is prevented through the secondary filter circuit, and is removed, so that the transmission of the low-frequency interference in the circuit is reduced, the influence of the low-frequency interference on a human body is avoided, and the health of the human body is protected.)

1. The utility model provides a high frequency filter circuit, includes power supply circuit, neutralization capacitor circuit, one-level filter circuit, second grade filter circuit and voltage stabilizing circuit, its characterized in that: the power supply circuit is used for providing electric energy for the neutralization capacitor circuit, the first-stage filter circuit, the second-stage filter circuit and the voltage stabilizing circuit, the first-stage filter circuit and the second-stage filter circuit are connected in parallel, and the neutralization capacitor circuit and the voltage stabilizing circuit are connected in series with the first-stage filter circuit and the second-stage filter circuit which are connected in parallel;

the neutralization capacitor circuit is used for inhibiting harmful parasitic oscillation in the intermediate frequency amplifier or the high frequency amplifier;

the primary filter circuit is used for filtering ripples in the rectified output voltage;

the secondary filter circuit is used for assisting the primary filter circuit and inhibiting waves of other frequencies in the circuit;

the voltage stabilizing circuit stabilizes the filtered signals and restores the signals in the circuit to be stable.

2. The high-frequency filter circuit according to claim 1, wherein: the primary filter circuit comprises capacitors C6, C7 and C8, an operational amplifier B1, inductance coils E1, E2, E3 and E4, the capacitors C6 and C7 are connected in series, the inductance coils E1 and E2 are connected in series, the capacitors C6 and C7 connected in series are connected in parallel with the inductance coils E1 and E2, the capacitor C8 is connected in parallel with the inductance coil E1, the positive electrode of the operational amplifier B1 is connected in series with the capacitors C6 and C7 connected in parallel with the inductance coils E1 and E2, and the negative electrode and the output end of the operational amplifier B1 are connected in parallel with the inductance coil E4.

3. The high-frequency filter circuit according to claim 2, wherein: the primary filter circuit further comprises a resistor R5, the resistor R5 is connected with the inductance coil E4 in series, the other end of the resistor R5 is connected with the capacitor C8 in series, and one end, connected with the capacitor C8, of the resistor R5 is grounded.

4. The high-frequency filter circuit according to claim 2, wherein: the two-stage filter circuit comprises resistors R6, R7, R8, R9, R10, R11, R12 and R13, capacitors C9, C10, C11 and C12, operational amplifiers B2 and B3, wherein the resistors R6 and R7 are connected in series and are connected with the anode of the operational amplifier B2, the resistors R10 and R11 are connected in series and are connected with the anode of the operational amplifier B3, the cathode and the output end of the operational amplifier B2 are connected with a resistor R9, the cathode and the output end of the operational amplifier B3 are connected with a resistor R13, a capacitor C9 is connected between the resistors R6 and R7, the other end of the capacitor C9 is connected with the output end of the operational amplifier B2, a capacitor C11 is connected between the resistors R10 and R11, and the other end of the capacitor C11 is connected with the output end of the operational amplifier B3.

5. The high-frequency filter circuit according to claim 4, wherein: one end of the resistor R9 is connected in series with a resistor R8, one end of the resistor R8 is grounded, a capacitor C10 is connected between the resistor R7 and the operational amplifier B2, one end of the capacitor C10 is grounded, one end of the resistor R13 is connected in series with a resistor R12, one end of the resistor R12 is grounded, a capacitor C12 is connected between the resistor R11 and the operational amplifier B3, and one end of the capacitor 12 is grounded.

6. The high-frequency filter circuit according to claim 4, wherein: one end of the resistor R6 is connected with one end of the inductance coil E1, the output end of the operational amplifier B1 is connected with the output end of the operational amplifier B3, and one end of the resistor R10 is connected with the output end of the operational amplifier B2.

7. The high-frequency filter circuit according to claim 1, wherein: the voltage stabilizing circuit comprises a triode F2, capacitors C13, C14, C15 and C16, a resistor R14 and a light emitting diode, wherein the capacitors C13 and C14 are connected in parallel, the capacitors C15 and C16 are connected in parallel, two ends of each of the capacitors C13 and C14 are connected to a base electrode and an emitter electrode of the triode F2, two ends of each of the capacitors C15 and C16 are connected to a collector electrode and an emitter electrode of the triode F2, and the resistor R14 is connected with the light emitting diode in series and is connected with the capacitor C16 in parallel.

8. The high-frequency filter circuit according to claim 1, wherein: the neutralization capacitor circuit comprises capacitors C1, C2, C3, C4, C5 and C18, resistors R1, R2 and R3, capacitors C1, C2 and C18, a triode F1, an inductor A, a capacitor C1 and a triode are connected in series, the capacitor C2 and the inductor A are connected in series, two ends of the capacitor C2 and the inductor A are respectively connected to an emitter and a base of a triode F1, and the resistors R1 and R2 are connected in series and are connected with a capacitor C2 in parallel.

9. The high-frequency filter circuit according to claim 8, wherein: one end of the inductance coil A is connected with a diode D1 which is connected in parallel to form a full bridge, a capacitor C17 is connected in parallel to the diode D1 of the full bridge, and a resistor R4 is connected in parallel to the capacitor C17.

10. The high-frequency filter circuit according to claim 1, wherein: a grounded capacitor C5 is connected between the capacitors R1 and R2, a grounded capacitor C3 is connected between the capacitor C2 and the inductor A, a grounded capacitor C4 is connected between the inductor A and the triode F1, a collector of the triode F1 is connected with an emitter of the triode F2 through a resistor R3, the resistors R1 and R2 are connected with the capacitor C6, and a base of the capacitor C1 is connected with a base of the triode F2.

Technical Field

The present invention relates to a filter circuit, and more particularly, to a high frequency filter circuit.

Background

The new energy automobile adopts unconventional automobile fuel as a power source (or adopts conventional automobile fuel and a novel vehicle-mounted power device), integrates advanced technologies in the aspects of power control and driving of the automobile, and forms an automobile with advanced technical principle, new technology and new structure. The safety of use of the lines for transmitting signals and energy in new energy vehicles is particularly important. A large amount of high-frequency interference exists in a power grid, and influences a circuit, so that the circuit cannot be normally used, and the circuit has potential safety hazards. In order to reduce the high frequency interference in the power circuit, a high frequency filter circuit is often used to filter the high frequency interference so as to ensure the normal use of the power circuit.

Use the high frequency interference filtering among the high frequency filter circuit with power supply circuit to fall, but the interference of some low frequencies still walks in the circuit, is influencing the circuit, can lead to converter output voltage's fluctuation, and low frequency interference can produce low frequency noise simultaneously, produces long-range influence to the health of human body, all can cause the injury to pregnant woman, children, makes the unable concentration of mental power, influences the health of health.

Disclosure of Invention

The present invention is directed to a high frequency filter circuit to solve the above problems.

In order to achieve the purpose, the invention provides a high-frequency filter circuit, which comprises a power circuit, a neutralization capacitor circuit, a first-stage filter circuit, a second-stage filter circuit and a voltage stabilizing circuit, wherein the power circuit is used for providing electric energy for the neutralization capacitor circuit, the first-stage filter circuit, the second-stage filter circuit and the voltage stabilizing circuit;

the neutralization capacitor circuit is used for inhibiting harmful parasitic oscillation in the intermediate frequency amplifier or the high frequency amplifier;

the primary filter circuit is used for filtering ripples in the rectified output voltage;

the secondary filter circuit is used for assisting the primary filter circuit and inhibiting waves of other frequencies in the circuit;

the voltage stabilizing circuit stabilizes the filtered signals and restores the signals in the circuit to be stable.

As a further improvement of the technical solution, the primary filter circuit includes capacitors C6, C7, C8, an operational amplifier B1, inductors E1, E2, E3, E4, the capacitors C6, C7 are connected in series, the inductors E1, E2 are connected in series, the capacitors C6, C7 connected in series are connected in parallel with the inductors E1, E2, the capacitor C8 is connected in parallel with the inductor E1, the positive electrode of the operational amplifier B1 is connected in series with the capacitors C6, C7 and the inductors E1, E2 connected in parallel, and the negative electrode of the operational amplifier B1 is connected in parallel with the output terminal of the inductor E4.

As a further improvement of the technical solution, the primary filter circuit further includes a resistor R5, the resistor R5 is connected in series with the inductor E4, the other end of the resistor R5 is connected in series with the capacitor C8, and one end of the resistor R5 connected with the capacitor C8 is grounded.

As a further improvement of the present technical solution, the two-stage filter circuit includes resistors R6, R7, R8, R9, R10, R11, R12, R13, capacitors C9, C10, C11, C12, operational amplifiers B2, B3, the resistors R6, R7 are connected in series and connected to the positive electrode of the operational amplifier B2, the resistors R10, R11 are connected in series and connected to the positive electrode of the operational amplifier B3, the negative electrode and the output end of the operational amplifier B2 are connected to the resistor R9, the negative electrode and the output end of the operational amplifier B3 are connected to the resistor R13, the capacitor C9 is connected between the resistors R6, R7, the other end of the capacitor C9 is connected to the output end of the operational amplifier B2, the capacitor C11 is connected between the resistors R10, R11, and the other end of the capacitor C11 is connected to the output end of the operational amplifier B3.

As a further improvement of the present invention, a resistor R8 is connected in series to one end of the resistor R9, one end of the resistor R8 is grounded, a capacitor C10 is connected between the resistor R7 and the operational amplifier B2, one end of the capacitor C10 is grounded, a resistor R12 is connected in series to one end of the resistor R13, one end of the resistor R12 is grounded, a capacitor C12 is connected between the resistor R11 and the operational amplifier B3, and one end of the capacitor 12 is grounded.

As a further improvement of the present invention, one end of the resistor R6 is connected to one end of the inductor E1, an output end of the operational amplifier B1 is connected to an output end of the operational amplifier B3, and one end of the resistor R10 is connected to an output end of the operational amplifier B2.

As a further improvement of the technical solution, the voltage stabilizing circuit includes a triode F2, capacitors C13, C14, C15, C16, a resistor R14 and a light emitting diode, the capacitors C13 and C14 are connected in parallel, the capacitors C15 and C16 are connected in parallel, two ends of the capacitors C13 and C14 are connected to a base and an emitter of the triode F2, two ends of the capacitors C15 and C16 are connected to a collector and an emitter of the triode F2, and the resistor R14 is connected in series with the light emitting diode and connected in parallel with the capacitor C16.

As a further improvement of the technical solution, the neutralization capacitor circuit includes capacitors C1, C2, C3, C4, C5, C18, resistors R1, R2, R3, capacitors C1, C2, C18, a transistor F1, an inductor a, the capacitor C1 is connected in series with the transistor, the capacitor C2 is connected in series with the inductor a, and two ends of the capacitor C2 are respectively connected to an emitter and a base of the transistor F1, the resistors R1, R2 are connected in series, and are connected in parallel with the capacitor C2.

As a further improvement of the technical solution, one end of the inductance coil a is connected with a diode D1 connected in parallel as a full bridge, a capacitor C17 is connected in parallel to the diode D1 of the full bridge, and a resistor R4 is connected in parallel to the capacitor C17.

As a further improvement of the present technical solution, a grounded capacitor C5 is connected between the capacitors R1 and R2, a grounded capacitor C3 is connected between the capacitor C2 and the inductor a, a grounded capacitor C4 is connected between the inductor a and the transistor F1, a collector of the transistor F1 is connected with an emitter of the transistor F2 through a resistor R3, the resistors R1 and R2 are connected with the capacitor C6, and the capacitor C1 is connected with a base of the transistor F2.

Compared with the prior art, the invention has the beneficial effects that:

1. in the high-frequency filter circuit, low-frequency interference in the circuit is prevented through the arranged secondary filter circuit, the low-frequency interference is removed, transmission of the low-frequency interference in the circuit is reduced, influence of the low-frequency interference on a human body is avoided, and therefore health of the human body is protected.

2. In the high-frequency filter circuit, high-frequency interference is removed through the arranged primary filter circuit, and low frequency in the circuit is removed through matching with the secondary filter circuit, so that frequency waves in the circuit are transmitted within a specified range, the circuit can run safely, and the use safety of a new energy automobile is improved.

3. In the high-frequency filter circuit, parasitic oscillation in high-frequency interference is removed through the arranged neutralization capacitor circuit, so that the influence of the parasitic oscillation on the circuit is avoided, and the primary filter circuit is convenient for filtering the high-frequency interference.

Drawings

FIG. 1 is an overall schematic block diagram of embodiment 1;

FIG. 2 is an overall operational schematic diagram of embodiment 1;

FIG. 3 is a diagram showing the operation of the first-stage filtering according to embodiment 1;

FIG. 4 is a diagram showing the operation of the two-stage filtering of embodiment 1;

FIG. 5 is a schematic diagram of the operation of the neutralization capacitor of embodiment 1;

FIG. 6 is a schematic diagram of the operation of the voltage regulator circuit according to embodiment 1.

Detailed Description

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

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Example 1

The invention provides a high-frequency filter circuit, please refer to fig. 1-6, which comprises a power circuit, a neutralization capacitor circuit, a first-stage filter circuit, a second-stage filter circuit and a voltage stabilizing circuit, wherein the power circuit is used for providing electric energy for the neutralization capacitor circuit, the first-stage filter circuit, the second-stage filter circuit and the voltage stabilizing circuit;

the neutralization capacitor circuit is used for inhibiting harmful parasitic oscillation in the intermediate frequency amplifier or the high frequency amplifier;

the primary filter circuit is used for filtering ripples in the rectified output voltage;

the secondary filter circuit is used for assisting the primary filter circuit and inhibiting waves of other frequencies in the circuit;

the voltage stabilizing circuit stabilizes the filtered signals and restores the signals in the circuit to be stable.

The primary filter circuit comprises capacitors C6, C7 and C8, an operational amplifier B1, inductors E1, E2, E3 and E4, capacitors C6 and C7 are connected in series, inductors E1 and E2 are connected in series, capacitors C6 and C7 which are connected in series are connected in parallel with inductors E1 and E2, a capacitor C8 is connected in parallel with the inductor E1, the anode of the operational amplifier B1 is connected in series with capacitors C6 and C7 which are connected in parallel with the inductors E1 and E2, the cathode and the output end of the operational amplifier B1 are connected in parallel with the inductor E4, the primary filter circuit further comprises a resistor R5, a resistor R5 and the inductor E4 are connected in series, the other end of the resistor R5 is connected in series with a capacitor C8, and one end of the resistor R5 and the capacitor C8 is connected to the ground.

When the first-stage filter circuit in the embodiment is used, when the current flowing through the inductors E1, E2, E3 and E4 changes, the induced electromotive force generated in the inductors E1, E2, E3 and E4 can prevent the change of the current. When the current passing through the induction coils E1, E2, E3 and E4 is increased, the self-induced electromotive force generated by the induction coils E1, E2, E3 and E4 is opposite to the current direction, so that the current is prevented from being increased, and meanwhile, a part of electric energy is converted into magnetic field energy and stored in the induction coils E1, E2, E3 and E4; when the current passing through the inductance coils E1, E2, E3 and E4 is reduced, the self-induced electromotive force is in the same direction as the current, the reduction of the current is prevented, and simultaneously, the stored energy is released to compensate the reduction of the current, so that the pulsation of the load current and the voltage is reduced, the waveform is smoothed, and after the circuit is filtered through the inductance coils E1, E2, E3 and E4, the high-frequency interference is removed, and the influence of the high-frequency interference on the normal use of the circuit is avoided.

Further, the secondary filter circuit comprises resistors R6, R7, R8, R9, R10, R11, R12, R13, capacitors C9, C10, C11, C12, operational amplifiers B2, B3, resistors R6, R7 connected in series and connected to the positive electrode of the operational amplifier B2, resistors R10, R11 connected in series and connected to the positive electrode of the operational amplifier B3, the negative electrode and the output end of the operational amplifier B2 connected to a resistor R9, the negative electrode and the output end of the operational amplifier B3 connected to a resistor R13, a capacitor C9 connected between the resistors R6 and R7, the other end of the capacitor C9 connected to the output end of the operational amplifier B2, a capacitor C11 connected between the resistors R10 and R11, and the other end of the capacitor C11 connected to the output end of the operational amplifier B3.

When the secondary filter circuit is used, current enters the operational amplifier B2 through the resistors R6 and R7, the operational amplifier B2 removes low-frequency interference, and simultaneously the current is transmitted to the operational amplifier B3 to be removed again, so that low-frequency interference in the circuit is small, and the low-frequency interference does not harm human bodies.

Specifically, a resistor R8 is connected in series at one end of the resistor R9, one end of the resistor R8 is grounded, a capacitor C10 is connected between the resistor R7 and the operational amplifier B2, one end of the capacitor C10 is grounded, one end of the resistor R13 is connected in series with the resistor R12, one end of the resistor R12 is grounded, a capacitor C12 is connected between the resistor R11 and the operational amplifier B3, one end of the capacitor 12 is grounded, one end of the resistor R6 is connected with one end of the inductor E1, the output end of the operational amplifier B1 is connected with the output end of the operational amplifier B3, one end of the resistor R10 is connected with the output end of the operational amplifier B2, the secondary filter circuit and the primary filter circuit are connected in parallel, the secondary filter circuit and the primary filter circuit are enabled to respectively filter high-frequency interference and low-frequency interference in the circuit, and high-frequency interference and low-frequency interference in the circuit are reduced.

Besides, the voltage stabilizing circuit comprises a triode F2, capacitors C13, C14, C15, C16, a resistor R14 and light emitting diodes, capacitors C13 and C14 are connected in parallel, capacitors C15 and C16 are connected in parallel, two ends of capacitors C13 and C14 are connected to a base and an emitter of a triode F2, two ends of capacitors C15 and C16 are connected to a collector and an emitter of a triode F2, a resistor R14 is connected in series with the light emitting diodes and is connected in parallel with a capacitor C16, when the primary filter circuit and the secondary filter circuit remove high-frequency and low-frequency interference in the circuit, weak signals in the circuit are amplified into electric signals with large amplitude values through the triode F2, the capacitors C2, C2 and C2 store electric energy, and when current on the circuit is reduced, the capacitors C2, C2 and C2 start to discharge outwards, so that the voltage of the circuit is ensured to be stable and the whole circuit is used in an environment with stable voltage.

Further, the neutralizing capacitor circuit comprises a capacitor C, R, C, a resistor R, a capacitor C, a triode F, an inductance coil A, the capacitor C is connected with the triode in series, the capacitor C is connected with the inductance coil A in series, two ends of the capacitor C are respectively connected with an emitting electrode and a base electrode of the triode F, the resistor R and R are connected in series and are connected with the capacitor C in parallel, the grounded capacitor C is connected between the capacitor R and the R, the grounded capacitor C is connected between the capacitor C and the inductance coil A, the grounded capacitor C is connected between the inductance coil A and the triode F, a collector electrode of the triode F is connected with the emitting electrode of the triode F through the resistor R, the resistor R and the capacitor C are connected between the R, and the base electrode of the capacitor C is connected with the base electrode of the triode F.

When the neutralizing capacitor circuit is used, when the phase of a signal at the lower end of the winding inductance coil A is negative, the signal at the lower end is added to the base of the triode F1 through the internal junction capacitor C2 of the triode F1, and meanwhile, the signal at the upper end of the inductance coil A is also added to the base of the triode F1 through the neutralizing capacitor C2, so that the two signals are opposite in phase and are added to the base of the triode F1 after being subtracted, when the capacity of the C1 is adjusted, the current flowing into the base of the triode F1 through the C1 channel is equal to the current flowing into the base of the triode F1 through the capacitor C2, and then the two currents are zero after being subtracted, so that the neutralizing capacitor C1 cancels the influence of the capacitor C2, the neutralizing purpose is achieved, the auxiliary interference of a high-frequency interference band in the circuit is removed, and the primary high-frequency filtering circuit is convenient to filter the interference in the circuit.

In addition, one end of the inductance coil A is connected with a diode D1 which is connected in parallel to form a full bridge, a capacitor C17 is connected in parallel to the diode D1 of the full bridge, a resistor R4 is connected in parallel to the capacitor C17, the full bridge circuit formed by connecting a plurality of diodes D1 is used for stabilizing the circuit, when the diode D1 is conducted, the capacitor C17 is charged, when the diode D1 is conducted, the capacitor C17 discharges to the resistor R4 when the diode D1 is conducted, the waveform of the filtered voltage becomes gentle, the filtered voltage is transmitted to the triode F1 through the inductance coil A, the triode F1 is stably pressed, and therefore the parasitic oscillation parasitic in the high-frequency interference can be removed more stably by the neutralization capacitance circuit.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.