CN105554666A - Hearing aid for old people - Google Patents

Abstract

The invention provides a hearing aid for old people, comprising a microphone, a first capacitor and a second capacitor. A positive electrode end of the microphone is connected to a first resistor while a negative electrode end thereof is connected to a cathode of a power supply; the first resistor is connected to an earphone jack, and the earphone jack is connected to an anode of the power supply; the first capacitor is connected to a public end of the microphone and the first capacitor, a second end of the first capacitor is connected to a second resistor, the second resistor is connected to a first end of an adjustable resistor, the second end of the adjustable resistor is connected to an input end of a COMS amplifier, and an output end of the COMS amplifier is connected to a sliding end of the adjustable resistor through a third resistor; the first end of the second resistor is connected to the output end of the COMS amplifier, the second end of the second capacitor is connected to a base electrode of a PNP transistor, a collector of the PNP transistor is connected to the anode of the power supply, and an emitter of the PNP transistor is connected to the cathode of the power supply and is also connected to the base electrode thereof through a fourth resistor.

Description

A kind of old hearing aids

Technical field

The present invention relates to electronic technology field, particularly the old hearing aids of one.

Background technology

Existing old hearing aids price is high, and volume is large, and power consumption, and the elderly needs the used time to open switch ability hearing aid, very inconvenient.

The volume of old hearing aids is large, mainly determined by power supply, the electric energy conversion efficiency of power supply is low, must be made up by battery capacity, how to improve the electric energy conversion efficiency of power supply, reduce battery volume, and then reduce the overall volume of old hearing aids, what strengthen user wears experience, is current problem demanding prompt solution.

Summary of the invention

The present invention proposes a kind of old hearing aids, solves existing old hearing aids price high, and volume is large, and the problem of power consumption.

Technical scheme of the present invention is achieved in that

A kind of old hearing aids, comprising: microphone, its positive terminal is connected to the first end of the first resistor, and its negative pole end is connected to the negative pole of power supply; Second end of described first resistor is connected to the first end of receiver J-Horner, and the second end of earphone jack is connected to the positive pole of described power supply; First capacitor, its first end is connected to the common port of described microphone and the first resistor, its the second end is connected to the first end of the second resistor, second end of the second resistor is connected to the first end of adjustable resistor, second end of adjustable resistor is connected to the input of COMS amplifier, the output of COMS amplifier is connected to the sliding end of described adjustable resistor by the 3rd resistor, wherein, COMS amplifier comprises three not gates be connected in series; Second capacitor, its first end is connected to the output of described COMS amplifier, its the second end is connected to the base stage of PNP transistor, the collector electrode of PNP transistor is connected to the positive pole of described power supply, and the emitter of PNP transistor is connected to the negative pole of described power supply and is connected to its base stage by the 4th resistor;

Described power supply comprises:

Input port, receives input voltage;

Output port, provides output voltage;

Intermediate node;

Input inductor and sampling resistor, be coupled in series between input port and intermediate node;

First power switch, is coupled between intermediate node and reference ground;

Second power switch, is coupled between intermediate node and output port;

Output capacitor, is coupled between output port and reference ground;

Operational amplifier, has first input end, the second input terminal and lead-out terminal, and its first input end and the second input terminal are connected across sampling resistor two ends, its lead-out terminal generation current sampled signal;

Feedback component, is coupled to output port and receives output voltage, and produce the feedback voltage of reflection output voltage;

Voltage comparator, has in-phase input end, inverting input and lead-out terminal, its inverting input threshold level voltage, and its in-phase input end is coupled to feedback component and receives feedback voltage, and its lead-out terminal produces voltage comparison signal;

Error comparator, has in-phase input end, inverting input and lead-out terminal, and its in-phase input end receives reference voltage, and its inverting input is coupled to feedback component and receives feedback voltage, and its lead-out terminal produces error amplification signal;

Clamper, is coupled between the lead-out terminal of error amplifier and reference ground;

First logic switch, has the first terminal, the second terminal and control terminal, and the lead-out terminal that its first terminal is coupled to error amplifier receives error amplification signal, and its control terminal is coupled to the lead-out terminal receiver voltage comparison signal of voltage comparator;

Second logic switch, have the first terminal, the second terminal and control terminal, its first terminal couples current peak signal, and its control terminal is coupled to the lead-out terminal receiver voltage comparison signal of voltage comparator;

Current comparator, there is in-phase input end, inverting input and lead-out terminal, its in-phase input end is coupled to the lead-out terminal received current sampled signal of operational amplifier, its inverting input is coupled to the second terminal of the first logic switch and the second terminal of the second logic switch, its lead-out terminal generation current comparison signal;

Control and drive circuit, be coupled to the lead-out terminal received current comparison signal of current comparator, and based on electric current comparison signal, produce two-way power switch drive singal, to control the break-make of the first power switch and the second power switch.

The invention has the beneficial effects as follows: old hearing aid design is simple and reliable, easy to use, reduces machine volume.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the circuit diagram of a kind of old hearing aids of the present invention;

Fig. 2 is the circuit diagram of power supply of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

As shown in Figure 1, the old hearing aids of one of the present invention, comprising: microphone 10, and its positive terminal is connected to the first end of the first resistor 21, and its negative pole end is connected to the negative pole of power supply 60; Second end of the first resistor 21 is connected to the first end of receiver J-Horner 50, and the second end of earphone jack 50 is connected to the positive pole of power supply 60; First capacitor 31, its first end is connected to the common port of microphone 10 and the first resistor 21, its second end is connected to the first end of the second resistor 22, second end of the second resistor 22 is connected to the first end of adjustable resistor 25, second end of adjustable resistor 25 is connected to the input of COMS amplifier, the output of COMS amplifier is connected to the sliding end of adjustable resistor 25 by the 3rd resistor 23, wherein, COMS amplifier comprises three not gates be connected in series 71, not gate 72 and not gate 73; Second capacitor 32, its first end is connected to the output of COMS amplifier, its the second end is connected to the base stage of PNP transistor 40, the collector electrode of PNP transistor 40 is connected to the positive pole of power supply 60, and the emitter of PNP transistor 40 is connected to the negative pole of power supply 60 and is connected to its base stage by the 4th resistor 24.

Fig. 2 is the electrical block diagram of power supply 100 according to an embodiment of the invention.As shown in Figure 2, power supply 100 of the present invention comprises: input port 101, receives input voltage vin; Output port 102, provides output voltage Vo; Intermediate node 103; Input inductor 104 and sampling resistor 105, be coupled in series between input port 101 and intermediate node 103; First power switch 106, is coupled between intermediate node 103 and reference ground; Second power switch 107, is coupled between intermediate node 103 and output port 102; Output capacitor 108, is coupled between output port 102 and reference ground; Operational amplifier 109, has first input end, the second input terminal and lead-out terminal, and its first input end and the second input terminal are connected across sampling resistor 105 two ends, its lead-out terminal generation current sampled signal Isen; Feedback component 110, is coupled to output port 102 and receives output voltage Vo, and produces the feedback voltage Vfb of reflection output voltage Vo; Voltage comparator 111, has in-phase input end, inverting input and lead-out terminal, its inverting input threshold level voltage Vth, and its in-phase input end is coupled to feedback component 110 and receives feedback voltage Vfb, and its lead-out terminal produces voltage comparison signal; Error comparator 119, has in-phase input end, inverting input and lead-out terminal, and its in-phase input end receives reference voltage Vref, and its inverting input is coupled to feedback component 110 and receives feedback voltage Vfb, and its lead-out terminal produces error amplification signal Vc; Clamper 112, is coupled between the lead-out terminal of error amplifier 119 and reference ground; First logic switch 113, there is the first terminal, the second terminal and control terminal, the lead-out terminal that its first terminal is coupled to error amplifier 119 receives error amplification signal Vc, and its control terminal is coupled to the lead-out terminal receiver voltage comparison signal of voltage comparator 111; Second logic switch 114, have the first terminal, the second terminal and control terminal, its first terminal couples current peak signal Ilim, and its control terminal is coupled to the lead-out terminal receiver voltage comparison signal of voltage comparator 111; Current comparator 115, there is in-phase input end, inverting input and lead-out terminal, its in-phase input end is coupled to the lead-out terminal received current sampled signal Isen of operational amplifier 109, its inverting input is coupled to the second terminal of the first logic switch 113 and the second terminal of the second logic switch 114, its lead-out terminal generation current comparison signal; Control and drive circuit 116, be coupled to the lead-out terminal received current comparison signal of current comparator 115, and based on electric current comparison signal, produce two-way power switch drive singal, to control the break-make of the first power switch 106 and the second power switch 107.

Transistor is connected into emitter follower form, amplifies the AC signal that cmos amplifier is exported by the second capacitor-coupled, and promote common headphones, wherein, the 4th resistor is biasing resistor.Complete machine adopts earphone jack to double as mains switch, and when headset plug inserts, power supply is connected, and when plug is extracted, power supply cuts off automatically, simplifies circuit structure, reduces machine volume.

Old hearing aid design of the present invention is simple and reliable, easy to use, reduces machine volume.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (1)

1. an old hearing aids, is characterized in that, comprising:

Microphone, its positive terminal is connected to the first end of the first resistor, and its negative pole end is connected to the negative pole of power supply; Second end of described first resistor is connected to the first end of receiver J-Horner, and the second end of earphone jack is connected to the positive pole of described power supply;

First capacitor, its first end is connected to the common port of described microphone and the first resistor, its the second end is connected to the first end of the second resistor, second end of the second resistor is connected to the first end of adjustable resistor, second end of adjustable resistor is connected to the input of COMS amplifier, the output of COMS amplifier is connected to the sliding end of described adjustable resistor by the 3rd resistor, wherein, COMS amplifier comprises three not gates be connected in series;

Second capacitor, its first end is connected to the output of described COMS amplifier, its the second end is connected to the base stage of PNP transistor, the collector electrode of PNP transistor is connected to the positive pole of described power supply, and the emitter of PNP transistor is connected to the negative pole of described power supply and is connected to its base stage by the 4th resistor

Described power supply comprises:

Input port, receives input voltage;

Output port, provides output voltage;

Intermediate node;

Input inductor and sampling resistor, be coupled in series between input port and intermediate node;

First power switch, is coupled between intermediate node and reference ground;

Second power switch, is coupled between intermediate node and output port;

Output capacitor, is coupled between output port and reference ground;

Operational amplifier, has first input end, the second input terminal and lead-out terminal, and its first input end and the second input terminal are connected across sampling resistor two ends, its lead-out terminal generation current sampled signal;

Feedback component, is coupled to output port and receives output voltage, and produce the feedback voltage of reflection output voltage;

Voltage comparator, has in-phase input end, inverting input and lead-out terminal, its inverting input threshold level voltage, and its in-phase input end is coupled to feedback component and receives feedback voltage, and its lead-out terminal produces voltage comparison signal;

Error comparator, has in-phase input end, inverting input and lead-out terminal, and its in-phase input end receives reference voltage, and its inverting input is coupled to feedback component and receives feedback voltage, and its lead-out terminal produces error amplification signal;

Clamper, is coupled between the lead-out terminal of error amplifier and reference ground;

First logic switch, has the first terminal, the second terminal and control terminal, and the lead-out terminal that its first terminal is coupled to error amplifier receives error amplification signal, and its control terminal is coupled to the lead-out terminal receiver voltage comparison signal of voltage comparator;

Second logic switch, have the first terminal, the second terminal and control terminal, its first terminal couples current peak signal, and its control terminal is coupled to the lead-out terminal receiver voltage comparison signal of voltage comparator;

Current comparator, there is in-phase input end, inverting input and lead-out terminal, its in-phase input end is coupled to the lead-out terminal received current sampled signal of operational amplifier, its inverting input is coupled to the second terminal of the first logic switch and the second terminal of the second logic switch, its lead-out terminal generation current comparison signal;

Control and drive circuit, be coupled to the lead-out terminal received current comparison signal of current comparator, and based on electric current comparison signal, produce two-way power switch drive singal, to control the break-make of the first power switch and the second power switch.