CN206759289U - Suppress the vehicle power interface circuit of engine noise - Google Patents

Abstract

A kind of vehicle power interface circuit for suppressing engine noise, including power supply, diode, electrochemical capacitor parasitic resistor, first capacitor, second capacitor, 3rd capacitor, inductor and outer load, the negative pole of diode, electrochemical capacitor parasitic resistor, first capacitor series connection ground connection, the positive pole of diode is connected with positive source, the negative pole ground connection of described power supply, the first end of second capacitor is connected with the negative pole of diode, the second end ground connection of second capacitor, the first end of inductor is connected with the negative pole of diode, second end of inductor passes through the 3rd capacitor grounding, outer load and the 3rd capacitor are in parallel, diode is low pressure drop diode, first capacitor is more than 1000uF big capacity electrolyte capacitor device, second capacitor and the 3rd capacitor are chip capacitor.The utility model can effectively improve the ability of the suppression engine noise of electronic system, and can provide reverse connecting protection to in-car power circuit, be also greatly reduced design cost.

Description

Suppress the vehicle power interface circuit of engine noise

Technical field:

It the utility model is related to circuit field, more particularly to plate level electronic module power interface circuit technology, particularly one Kind suppresses the vehicle power interface circuit of engine noise.

Background technology:

In the prior art, with electronic technology greatly develop and the popularization of family-sized car, vehicle electronics product are met Carry out the development of high speed while also welcome huge challenge.Due to the particularity of vehicle-mounted use occasion and answering for application environment Polygamy, very high requirement is proposed to in-vehicle electronic system stability.And the power interface circuit of electronic system is as the energy Access interface, its stability and anti-interference, largely determine the performance reliability of this electronic system.

The power interface loop being commonly used at present is to carry special MOSFET chips to combine certain discrete device shape Into power interface circuit.The Inner Constitution BLOCK figures of the special MOSFET chips, this power interface circuit solution have Larger limitation, first, suppress engine noise poor performance, engine noise is directly superimposed to internal electricity by MOSFET Road；Secondly, cost is high, need to use special MOSFET chips；Again, it is necessary to compared with multiple resource auxiliary, it is necessary to external control circuit with And control port.

The content of the invention：

The purpose of this utility model is to provide a kind of vehicle power interface circuit for suppressing engine noise, described this The vehicle power interface circuit of kind suppression engine noise will solve power interface circuit suppression engine of the prior art and make an uproar Sound poor performance, using special chip cost it is high, need to aid in, need the skill of external control circuit and control port compared with multiple resource Art problem.

This vehicle power interface circuit for suppressing engine noise of the present utility model, including power supply, diode, electrolysis Capacitive parasitic resistor, the first capacitor, the second capacitor, the 3rd capacitor, inductor and outer load, wherein, described two Negative pole, electrochemical capacitor parasitic resistor, the first capacitor of pole pipe are connected in series ground terminal, the positive pole and power supply of described diode Positive pole is connected, and the negative pole connection ground terminal of described power supply, the described first end of the second capacitor is connected with the negative pole of diode, The second end connection ground terminal of the second described capacitor, the first end of described inductor is connected with the negative pole of diode, described The second end of inductor pass through the 3rd capacitor and connect ground terminal, described outer load and the 3rd capacitor are in parallel.

Further, the offset voltage of power supply is 12V, voltage amplitude 4V, frequency 7kHz.

Further, diode uses low pressure drop diode.

Further, the first capacitor is more than 1000uF electrolytic capacitor.

Further, the second capacitor and the 3rd capacitor are chip capacitor.

The utility model compares with prior art, and its effect is positive and obvious.This suppression of the present utility model The vehicle power interface circuit of engine noise includes power supply, a diode, an electrochemical capacitor parasitic resistor, three electricity Load outside container, an inductor and one, at power input interface of the present utility model, using low pressure drop, high current two Pole pipe, big capacity electrolyte capacitor device (more than 1000uF, root in itself be present using the total input of power circuit after diode It is specifically used according to system), both form rectification circuit, can so effectively reduce the noise of low frequency, utilize two patches afterwards Chip capacitor device and high frequency filter is collectively forming with inductor coil, has to external interference and filter out effect well, it is such whole Good inhibiting effect can be had to engine noise by being combined together.

The utility model utilizes common diode and a small amount of discrete device, and using board-level circuit power input in itself The characteristic of large value capacitor be present, form a kind of new plate level power supply interface circuit.The utility model can be improved effectively The ability of the suppression engine noise of electronic system, and reverse connecting protection can be provided to in-car power circuit, also substantially reduce Design cost.

Brief description of the drawings：

Fig. 1 is the schematic diagram of the vehicle power interface circuit structure of suppression engine noise of the present utility model.

Fig. 2 is the schematic diagram of traditional vehicle power interface circuit structure.

Fig. 3 is the cut-away view that traditional vehicle power interface circuit carries special MOSFET chips.

Fig. 4 is the PSpice emulation schematic diagrames of the vehicle power interface circuit of suppression engine noise of the present utility model.

Fig. 5 is vehicle power interface circuit and the emulation of conventional circuit structure of suppression engine noise of the present utility model Comparison of wave shape figure.

Fig. 6 is the vehicle power interface circuit of suppression engine noise of the present utility model and the real machine of conventional circuit structure Test waveform comparison diagram.

Fig. 7 is the vehicle power interface circuit of suppression engine noise of the present utility model for high band noise suppressed Spectrum analysis figure.

Embodiment：

Embodiment 1:

As shown in figure 1, the vehicle power interface circuit of the present utility model for suppressing engine noise, including power supply V3, two Pole pipe D1, electrochemical capacitor parasitic resistor R1, the first capacitor C1, the second capacitor C2, the 3rd capacitor C3, inductor L1 and Outer load LOAD, wherein, described diode D1 negative pole and electrochemical capacitor parasitic resistor R1, the first capacitor C1 series connection connect Earth terminal 0, described diode D1 positive pole are connected with power supply V3 positive poles, described power supply V3 negative pole connection ground terminal 0, described The second capacitor C2 first end A be connected with diode D1 negative pole, the second end C connection ground terminals of the second described capacitor 0, described inductor L1 first end A is connected with diode D1 negative pole, and described inductor L1 the second end B passes through the 3rd Capacitor C3 connections ground terminal 0, described outer load LOAD and the 3rd capacitor C3 are in parallel.

Further, power supply V3 offset voltage is 12V, voltage amplitude 4V, frequency 7kHz.

Further, diode D1 uses low pressure drop diode.

Further, the first capacitor C1 is more than 1000uF electrolytic capacitor.

Further, the second capacitor C2 and the 3rd capacitor C3 is chip capacitor.

As shown in Fig. 2 traditional power interface loop is to carry special MOSFET chips to combine certain discrete device Form power interface circuit.

As shown in figure 3, the Inner Constitution BLOCK figures for the special MOSFET chips that traditional power interface loop is carried, this Kind power interface circuit solution has larger limitation, is mainly shown as：1) suppress engine noise poor performance, start Machine noise is directly superimposed to internal circuit by MOSFET；2) cost is high, uses special MOSFET chips；3) need compared with multiple resource Auxiliary is, it is necessary to external control circuit and control port.

As shown in Fig. 4, Fig. 5, Fig. 6, the utility model has good application effect in vehicle-mounted information and entertainment system, vehicle-mounted Information entertainment typically there is video-audio playing information the function such as show, simply be divided into two modules, and one piece is power amplification system, need There is relatively low noise under the situation of low frequency, and there is larger consumption electric current.Other one piece is in addition to power amplifier Other modules, be both needed to ensure very low noise in full frequency band, to ensure the stability of system, but it is very low to consume electric current.Fig. 4 Middle diode D1 forms the filtering of low frequency end with the big capacity electrolyte capacitor device C1 that power amplification system carries, compared with conventional power source interface side Formula can effectively reduce 1/2 noise amplitude.In Fig. 5, simulation waveform (note of two kinds of interface circuits at power amplifier access A ends：Make Noise source is 7KHz＆Vp-p=4V, the standard of OEM depots), and Fig. 6 is when being applied to actual circuit under the same terms Test waveform, the utility model can effectively suppress engine noise (noise it can be seen from emulation and actual machine test waveform Reduce more than 6dB).

The π types formed after power amplification system has electrolytic capacitor C1 by oneself by the ceramic capacitor and inductor of low-capacitance are filtered Ripple device, effectively can further reduce the noise amplitude of high band, and B ends are the system power supply access in addition to power amplifier module Place.As shown in fig. 7, for high frequency 100kHz＆Vp-p=4V when A ends and B ends noise amplitude, by simulation waveform it can be seen that A ends Place's noise is 320mV, and the noise at B ends has already decreased to 20mV, and the suppression for noise has good advantage.

Among practical application, either from audio performance data or real vehicle auditory effect, the utility model relatively pass System power interface circuit has preferable improvement in performance data and sense of hearing.

Claims (5)

1. a kind of vehicle power interface circuit for suppressing engine noise, including power supply, diode, electrochemical capacitor dead resistance Device, the first capacitor, the second capacitor, the 3rd capacitor, inductor and outer load, it is characterised in that：Described diode Negative pole, electrochemical capacitor parasitic resistor, the first capacitor are connected in series ground terminal, positive pole and the positive source phase of described diode Even, the negative pole connection ground terminal of described power supply, the described first end of the second capacitor is connected with the negative pole of diode, described The second end connection ground terminal of second capacitor, the first end of described inductor are connected with the negative pole of diode, described inductance Second end of device connects ground terminal by the 3rd capacitor, and described outer load and the 3rd capacitor are in parallel.

2. suppress the vehicle power interface circuit of engine noise as claimed in claim 1, it is characterised in that：Described power supply Offset voltage be 12V, voltage amplitude 4V, frequency 7kHz.

3. suppress the vehicle power interface circuit of engine noise as claimed in claim 1, it is characterised in that：Two described poles Pipe uses low pressure drop diode.

4. suppress the vehicle power interface circuit of engine noise as claimed in claim 1, it is characterised in that：Described first Capacitor is more than 1000uF electrolytic capacitor.

5. suppress the vehicle power interface circuit of engine noise as claimed in claim 1, it is characterised in that：Described second Capacitor and the 3rd capacitor are chip capacitor.