Ear barrier servicing unitTechnical field
The present invention relates to electronic technology field, particularly a kind of ear barrier servicing unit.
Background technology
Existing ear barrier servicing unit 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 ear barrier servicing unit 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 ear barrier servicing unit, what strengthen user wears experience, is current problem demanding prompt solution.
Summary of the invention
The present invention proposes a kind of ear barrier servicing unit, and solve existing ear barrier servicing unit price high, volume is large, and the problem of power consumption.
Technical scheme of the present invention is achieved in that
A kind of ear barrier servicing unit, 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;
First switch and second switch, be coupled in series between input port and reference ground;
Output inductor and sampling resistor, be coupled in series between the coupled in series node of the first switch and second switch and output port;
Output capacitor, is coupled between output port and reference ground;
Feedback component, is coupled to output port and receives output voltage, and produce the feedback voltage of reflection output voltage;
Error amplifier, has in-phase input end, inverting input and lead-out terminal, and its in-phase input end receives the first reference voltage, and its inverting input is coupled to feedback component and receives feedback voltage, and its lead-out terminal produces error amplification signal;
Operational amplifier, is coupled to sampling resistor to produce inductive current sampled signal;
First comparator, there is in-phase input end, inverting input and lead-out terminal, the lead-out terminal that its inverting input is coupled to error amplifier receives error amplification signal, and its in-phase input end is coupled to operational amplifier receiving inductance current sampling signal, and its lead-out terminal produces reset signal;
Second comparator, has in-phase input end, inverting input and lead-out terminal, and its in-phase input end receives the second reference voltage, and its inverting input is coupled to operational amplifier receiving inductance current sampling signal, and its lead-out terminal produces asserts signal;
Rest-set flip-flop, there is reseting terminal, set terminal and lead-out terminal, the lead-out terminal that its reseting terminal is coupled to the first comparator receives reset signal, the lead-out terminal that its set terminal is coupled to the second comparator receives asserts signal, and described rest-set flip-flop produces logical signal based on reset signal and asserts signal at its lead-out terminal;
Drive circuit, is coupled to rest-set flip-flop receive logic signal, and logic-based signal produces two-way drive singal, to drive the break-make of the first switch and second switch;
Described first switch and second switch are mos field effect transistor;
Described feedback component comprises and is coupled in series in output port and with reference to the first resistance between ground and the second resistance, wherein feedback voltage produces at the coupled in series Nodes of the first resistance and the second resistance;
Described error amplifier, operational amplifier, the first comparator, the second comparator, rest-set flip-flop and drive circuit all can be integrated into an integrated circuit (IC) chip;
Described switch power converter comprises further:
Compensation condenser, is coupled between the inverting input of error amplifier and lead-out terminal.
The invention has the beneficial effects as follows:
Ear barrier servicing unit simplicity of design is 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 ear barrier of the present invention servicing unit;
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, a kind of ear barrier servicing unit of the present invention, comprising: microphone 10, 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; First switch 103 and second switch 104, be coupled in series between input port 101 and reference ground; Output inductor 105 and sampling resistor 106, between the coupled in series node being coupled in series in the first switch 103 and second switch 104 and output port 102; Output capacitor 107, is coupled between output port 102 and reference ground; Feedback component 108, is coupled to output port 102 and receives output voltage Vo, and produces the feedback voltage Vfb of reflection output voltage Vo; Error amplifier 109, has in-phase input end, inverting input and lead-out terminal, and its in-phase input end receives the first reference voltage Vref 1, and its inverting input is coupled to feedback component 108 and receives feedback voltage Vfb, and its lead-out terminal produces error amplification signal; Operational amplifier 110, is coupled to sampling resistor 106 to produce inductive current sampled signal; First comparator 111, there is in-phase input end, inverting input and lead-out terminal, the lead-out terminal that its inverting input is coupled to error amplifier 109 receives error amplification signal, its in-phase input end is coupled to operational amplifier 110 receiving inductance current sampling signal, and its lead-out terminal produces reset signal; Second comparator 112, has in-phase input end, inverting input and lead-out terminal, and its in-phase input end receives the second reference voltage, and its inverting input is coupled to operational amplifier 110 receiving inductance current sampling signal, and its lead-out terminal produces asserts signal; Rest-set flip-flop 113, there is reseting terminal R, set terminal S and lead-out terminal Q, the lead-out terminal that its reseting terminal R is coupled to the first comparator 111 receives reset signal, the lead-out terminal that its set terminal S is coupled to the second comparator 112 receives asserts signal, and described rest-set flip-flop produces logical signal based on reset signal and asserts signal at its lead-out terminal Q; Drive circuit 114, is coupled to rest-set flip-flop 111 receive logic signal, and logic-based signal produces two-way drive singal, to control the break-make of the first switch 103 and second switch 104.
Preferably, described first switch 103 and second switch 104 are mos field effect transistor (MOSFET).
Preferably, described power supply 100 also comprises: compensation condenser 115, between the inverting input being coupled in error amplifier 109 and lead-out terminal.
Preferably, feedback component 108 comprises and is coupled in series in output port 102 and with reference to the first resistance between ground and the second resistance, wherein feedback voltage Vfb produces at the coupled in series Nodes of the first resistance and the second resistance.
Preferably, error amplifier 109, operational amplifier 110, first comparator 111, second comparator 112, rest-set flip-flop 113 and drive circuit 114 all can be integrated into an integrated circuit (IC) chip.
When power supply 100 normally runs, when the first switch 103 is switched on, input voltage vin is transmitted via the first switch 103, output inductor 105, sampling resistor 106 and output capacitor 107 and is converted into output voltage Vo.The electric current flowing through output inductor 105 and sampling resistor 106 starts to increase.The inductive current sampled signal that then operational amplifier 110 exports also starts to increase.When its increase to be greater than error amplification signal time, first comparator 111 export asserts signal become high level.Accordingly, the logical signal that rest-set flip-flop 113 exports is reset to low level.First switch 103 disconnects via after drive circuit 114 by this low level logical signal, and by second switch 104 conducting.
First switch 103 is disconnected, second switch 104 switched on after, the energy on output inductor 105 and output capacitor 107 forms current path by second switch 104 and carries out afterflow.The electric current flowing through second switch 104 starts to reduce.The inductive current sampled signal that then operational amplifier 110 exports starts to reduce.When its be decreased to be less than the second reference voltage Vref 2 time, second comparator export asserts signal become high level.Accordingly, the asserts signal that rest-set flip-flop 113 exports becomes high level.The asserts signal of this high level via after drive circuit 114 by the first switch 103 conducting, and second switch 104 to be disconnected.Power supply 100 enters a new switch periods.Therefore, power supply 100 of the present invention ensures that the electric current flowing through output inductor 105 is in error amplification signal and the second reference voltage range, serves good current loop control.
And at error amplifier 109 place, when output voltage Vo increases, feedback voltage Vfb increases thereupon, then the error amplification signal that error amplifier 109 exports reduces.Correspondingly, in the inductive current rise time section that the first switch 103 conducting, second switch 104 disconnect, inductive current sampled signal encounters error amplification signal earlier.Therefore, the logical signal that the reset signal that the first comparator 111 exports high level earlier exports with reset rest-set flip-flop 113, therefore, the ON time of the first switch 103 is shortened, and output voltage Vo declines.Otherwise when output voltage Vo reduces, feedback voltage Vfb reduces thereupon, then the error amplification signal that error amplifier 109 exports increases.Correspondingly, in the inductive current rise time section that the first switch 103 conducting, second switch 104 disconnect, inductive current sampled signal encounters error amplification signal more lately.Therefore, the logical signal that the reset signal that the first comparator 111 exports high level more lately exports with reset rest-set flip-flop 113, therefore, the ON time of the first switch 103 is extended, and output voltage Vo rises.Therefore, output voltage Vo obtains and effectively regulates, and power supply 100 of the present invention also serves good Voltage loop and controls.
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.
Ear barrier servicing unit simplicity of design of the present invention is 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.