CN101881267B - Air pump control circuit and electronic sphygmomanometer - Google Patents
Air pump control circuit and electronic sphygmomanometer Download PDFInfo
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- CN101881267B CN101881267B CN 201010175335 CN201010175335A CN101881267B CN 101881267 B CN101881267 B CN 101881267B CN 201010175335 CN201010175335 CN 201010175335 CN 201010175335 A CN201010175335 A CN 201010175335A CN 101881267 B CN101881267 B CN 101881267B
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Abstract
The invention provides an air pump control unit, which is used for controlling the operation of an air pump and comprises a power supply, a power supply switch, a control unit and two selector switches. The power supply is used for providing electric energy for the air pump. The selector switches are respectively provided with an input end connected with the power supply, an output end connected with the air pump, a grounding end and a control end connected with the control unit, the output ends of the two selector switches are respectively connected with one terminal of the air pump and can be selectively connected with the input end or the grounding end according to a selection signal transmitted by the control unit, and the output ends of the first selector switch and the second selector switch are not simultaneously connected with the grounding end or the input end. The air pump control circuit can realize the alternating rotation of the air pump in the forward direction or the reverse direction, and reduce the wear of a motor winding and/or a bearing in one position, thereby prolonging the service life of the air pump. In addition, the invention provides an electronic sphygmomanometer. The air pump on the electronic sphygmomanometer can rotate alternatively in the forward direction or the reverse direction, thereby prolonging the service life of the electronic sphygmomanometer.
Description
Technical field
The invention belongs to field of medical, be specifically related to a kind of control circuit and electric sphygmomanometer of the inflator pump running status for controlling electric sphygmomanometer.
Background technology
Along with the progress of technology, also in constantly upgrading, meanwhile, the competition between the manufacturing enterprise of medical apparatus and instruments is also more and more fierce for medical apparatus and instruments.Therefore, just need these manufacturing enterprises constantly to improve the market competition that its product quality is growing more intense with reply.
For example, the sphygomanometer that often uses in the daily life, manufacturing enterprise is in order to improve the competitive advantage of its product, developed to measure more accurately, replace traditional mercury sphygmomanometer with convenient electric sphygmomanometer.
See also Fig. 1, be currently used electric sphygmomanometer schematic diagram.This electric sphygmomanometer mainly comprises power supply 117, detecting unit, the first microcontroller (MCU1) 105, electromagnetic valve 108, inflator pump 107, inflator pump control circuit 106, the second microcontroller (MCU2) 112, display device 113, keyboard 114, holding circuit 115 and electric source monitoring circuit 116.
Wherein, power supply 117 comprises analog power (AVCC) 118 and digital power (DVCC) 119, and being used for needs the corresponding device of electric energy that electric energy is provided to electric sphygmomanometer.The second microcontroller 112 outer display device 113 and keyboards 114 of being provided with, display device 113 is used for showing the function menu of the parameter value relevant with blood pressure and operation electric sphygmomanometer, keyboard 114 is used for to electric sphygmomanometer transmit operation instruction, and user can be finished operation to electric sphygmomanometer by display device 113 and keyboard 114.
The first microcontroller 105 is connected with detecting unit, inflator pump control circuit 106, electromagnetic valve 108, the second microcontroller 112, external memory space (ROM) and internal storage space (RAM), wherein, detecting unit comprises sensor, measuring circuit, filtering and amplifying circuit, A/D convertor circuit; Inflator pump control circuit 106 is connected with inflator pump 107; The first microcontroller 105 is connected with the second microcontroller 112 by serial data bus (URAT).When user sends instruction (starting or stoping) signal by keyboard 114 to electric sphygmomanometer, this command signal sends to the first microcontroller 105 by the second microcontroller 112 and serial data bus, is controlled the operation of inflator pump 107 by inflator pump control circuit 106 by the first microcontroller 105 again.
When user sent operating instruction by keyboard 114 to electric sphygmomanometer, the first microcontroller 105 sent operating instruction to inflator pump 107, and inflator pump 107 beginnings are inflated in cuff.At this moment, detecting unit is started working, and the signal that detects is sent to the first microcontroller 105.The concrete work process of detecting unit is as follows: sensor detects the pressure in the cuff in real time, and send the pressure signal that detects to measuring circuit, this pressure signal is converted into analogue signal through measuring circuit, again after filtering and amplifying circuit amplification, filtering, by A/D convertor circuit this analogue signal is converted into digital signal, at last, the form with digital signal is sent to the first microcontroller 105.The first microcontroller 105 is according to the digital signal from A/D convertor circuit, calculate the numerical value relevant with blood pressure such as systolic pressure, mean pressure, diastolic pressure and/or pulse frequency by the blood pressure algorithm, then, the numerical value that these are relevant with blood pressure is sent to display device 113 through serial data bus and the second microcontroller 112, and user can directly be seen the numerical value that these are relevant with blood pressure by display device 113.
The protection that power supply monitoring module and holding circuit 115 are used for cuff; when the pressure in the cuff reaches certain value; holding circuit 115 is sent the reset level signal to the power supply monitoring module; the power supply monitoring module is resetted; thereby the pressure in the cuff is all released, prevent that with this cuff is excessive and damaged because of pressure.
In above-mentioned electric sphygmomanometer, the first microcontroller 105 is to control by 106 pairs of inflator pumps 107 of inflator pump control circuit.See also inflator pump control circuit figure shown in Figure 2, inflator pump control circuit 106 comprises a power supply, two field effect transistor, a diode, two electric capacity and three resistance, and wherein, power supply VIN is inflator pump 107 power supplies; The grid of field effect transistor Q21 is connected with resistance R by the resistance R 21 of series connection and is connected with aeration speed control input end TXA0 on the first microcontroller 105, the drain electrode of field effect transistor Q21 is connected with the second terminals 2 of inflator pump, simultaneously with the anodic bonding of diode D21, the negative electrode of diode D21 is connected with the first terminals 1 of inflator pump; The source electrode of field effect transistor Q21 is connected with the drain electrode of field effect transistor Q22; The grid of field effect transistor Q22 is connected with pump startup gauge tap PUMPC on the first microcontroller 105 by resistance R 23, the source electrode of field effect transistor Q22 with connection.In addition, at the two ends of diode D21 shunt capacitance C21; The drain electrode of being on the scene effect pipe Q21 and grid shunt capacitance C22, an end of this capacitor C 22 links to each other with the drain electrode of field effect transistor Q21, and its other end and resistance R 21 are connected an interconnective side and are connected with resistance R.
When user sends enabling signal by keyboard 114 to electric sphygmomanometer, the first microcontroller 105 sends high level signal to pump startup gauge tap PUMPC (starting control signal by the power control switch unit rear pump in the first microcontroller 105) and aeration speed control input end TXA0 (by the speed control signal unit output speed control signal in the first microcontroller 105), makes simultaneously conducting of field effect transistor Q21 and field effect transistor Q22.At this moment, the electric current of power supply VIN is by the first terminals 1 of inflator pump flow through successively the second terminals 2, field effect transistor Q21 and the field effect transistor Q22 of inflator pump, and inflator pump is started working.When user sends stop signal by keyboard 114 to electric sphygmomanometer, the first microcontroller 105 sends low level signal to pump startup gauge tap PUMPC and aeration speed control input end TXA0, field effect transistor Q21 and field effect transistor Q22 are ended, inflator pump control circuit 106 can not form path, therefore, power supply VIN can not be to inflator pump 107 power supplies, and inflator pump 107 is out of service.
Although above-mentioned electric sphygmomanometer is more convenient to operate with respect to mercury sphygmomanometer, certainty of measurement is higher.Yet, in actual applications, inflator pump 107 in the above-mentioned electric sphygmomanometer all can be subject to the effect of certain load shock power (such as atmospheric pressure) inevitably in the process that starts, this load shock power meeting direct effect causes the wearing and tearing of motor winding and bearing on the bearing and motor winding of inflator pump 107.Yet, under the control of above-mentioned inflator pump 107 control circuits 106, electric current always flows to the second terminals 2 from the first terminals 1 of inflator pump, that is to say that inflator pump 107 always rotates facing one direction, therefore, the load shock power in each start-up course all causes wearing and tearing in the same position (or position) of bearing and motor winding, therefore, the service life of inflator pump 107 is shorter, affects the service life of electric sphygmomanometer.
Summary of the invention
For addressing the above problem, the invention provides a kind of inflator pump control circuit and electric sphygmomanometer, it can make inflator pump alternately rotate at twocouese, to reduce motor winding and bearing in the wearing and tearing of same position, thereby improve the service life of inflator pump, and then improve the service life of electric sphygmomanometer.
For this reason, the invention provides a kind of inflator pump control circuit, the running status that is used for the control inflator pump, being included as inflator pump provides power supply and the on and off switch of electric energy, also comprise a control unit and two selector switches, each described selector switch has the input that is connected with described power supply, the outfan that is connected with inflator pump, earth terminal and the control end that is connected with described control unit, the outfan of described two selector switches is connected with terminals of inflator pump respectively, the outfan of described selector switch is selectively connected with input or the earth terminal of described selector switch according to the selection signal from described control unit, and, when the input of the outfan of the first selector switch and this selector switch or earth terminal were connected, the outfan of the second selector switch was correspondingly connected with earth terminal or the input of this selector switch.
Wherein, each described selector switch comprises two field effect transistor that the conducting current potential is different, wherein, the source/drain of the first field effect transistor is as the input of described selector switch, the drain/source of described the first field effect transistor is connected with the source/drain of the second field effect transistor and as the outfan of described selector switch, the drain/source of described the second field effect transistor is as the earth terminal of described selector switch, and the grid of described two field effect transistor connects rear control end as described selector switch.
Wherein, described two field effect transistor can be N channel field-effect pipe or P-channel field-effect transistor (PEFT) pipe.
Wherein, described control unit comprises a trigger and two audions, the base stage of described two audions is connected with two outfans of described trigger respectively, the colelctor electrode of described two audions is connected with the control end of described two selector switches respectively, the emitter stage of described two audions is all connected with ground, and described trigger is exported high and low level signal and made conducting in described two audions and another cut-off.
Wherein, described trigger is rest-set flip-flop or JK flip-flop or d type flip flop.
Wherein, between described power supply and described selector switch, also be provided with the first short-circuit resistance and Voltage stabilizing module, described Voltage stabilizing module connects by the described power supply of described the first short-circuit resistance, and the outfan of described Voltage stabilizing module is connected with the input of described two selector switches.
Wherein, between described power supply and described selector switch, also be provided with the second short-circuit resistance and connecting valve, one end of described the second short-circuit resistance is connected with the outfan of described Voltage stabilizing module, its other end is connected with the input of described Voltage stabilizing module, and described connecting valve is arranged between the input and described the second short-circuit resistance of described Voltage stabilizing module.
Wherein, described control circuit also comprises the power protection unit; this power protection unit comprises four diodes; wherein; the negative electrode of the first diode be connected the anode of diode and be connected with terminals of described inflator pump; the anode of the negative electrode of the 3rd diode and the 4th diode is connected with another terminals of described inflator pump, the plus earth of the anode of the first diode and the 3rd diode, and the negative electrode of the negative electrode of the second diode and the 4th diode is connected with power supply.
Wherein, described power protection unit also comprises protection electric capacity, and described protection electric capacity is arranged between the negative electrode and ground of described the second diode.
Wherein, described inflator pump control circuit also comprises the aeration speed control unit, described aeration speed control unit comprises speed control signal unit, the 7th resistance and the 5th field effect transistor, the source electrode of described the 5th field effect transistor is connected with ground with the input of described selector switch respectively with being connected, the grid of described the 5th field effect transistor is connected with an end of described the 7th resistance, the other end of described the 7th resistance is connected with described speed control signal unit, and described speed control signal unit is used for providing the speed control signal that is switched on or switched off to described the 5th field effect transistor.
Wherein, described aeration speed control unit also comprises filter capacitor and the 8th resistance, one end of described the 8th resistance is connected with a described end of described the 7th resistance, the other end of described the 8th resistance is connected with the grid of described the 5th field effect transistor, described filter capacitor one end is connected with the interconnective end of described the 7th resistance and the 8th resistance, and its other end is connected with ground.
In addition, the present invention also provides a kind of electric sphygmomanometer, comprise inflator pump and inflator pump control unit, described inflator pump control unit is controlled the direction of rotation of described inflator pump, and the topological structure of described inflator pump control unit is inflator pump control circuit described above.
The present invention has following beneficial effect:
Inflator pump control circuit provided by the invention is by being provided with a control unit and two selector switches between described power supply and inflator pump, each described selector switch has the input that is connected with described power supply, the outfan that is connected with inflator pump, earth terminal and the control end that is connected with described control unit, the outfan of described two selector switches is connected with terminals of inflator pump respectively, the outfan of described selector switch is selectively connected with input or earth terminal according to the selection signal from described control unit, and, when the input of the outfan of the first selector switch and this selector switch or earth terminal were connected, the outfan of the second selector switch was correspondingly connected with earth terminal or the input of this selector switch.Make respectively selection and power supply or the ground connection of two ends of inflator pump by cooperatively interacting of two selector switches, make electric current alternately flow through inflator pump from both direction (flow to the second terminals 2 or flow to the first terminals 1 from the second terminals 2 from the first terminals 1), thereby inflator pump is alternately rotated forward or backwards, reduce motor winding and bearing in the wearing and tearing of same position with this, thereby improve the service life of inflator pump, and then prolong the service life of electric sphygmomanometer.
Similarly, owing to used above-mentioned inflator pump control circuit provided by the invention in the electric sphygmomanometer provided by the invention, make electric current alternately flow through inflator pump from both direction, thereby inflator pump is alternately rotated forward or backwards, reduce motor winding and bearing in the wearing and tearing of same position with this, thereby improve the service life of inflator pump, and then improve the service life of electric sphygmomanometer.
Description of drawings
Fig. 1 is the electric sphygmomanometer theory diagram that adopts at present;
Fig. 2 is the inflator pump control circuit figure that adopts at present;
Fig. 3 is the theory diagram of inflator pump control circuit provided by the invention; And
Fig. 4 is the topology diagram of inflator pump control circuit provided by the invention.
The specific embodiment
For making those skilled in the art understand better technical scheme of the present invention, below in conjunction with the drawings and specific embodiments inflator pump control circuit provided by the invention and electric sphygmomanometer are described in detail.
The electric sphygmomanometer of present embodiment comprises power supply, detecting unit, the first microcontroller, electromagnetic valve, inflator pump, inflator pump control circuit, the second microcontroller, display device, keyboard, holding circuit and electric source monitoring circuit; most of and accompanying drawing 1 basic simlarity of the annexation of these parts and working method, difference only is the topological structure of inflator pump control circuit and the working method of inflator pump.The below only is described the topological structure of inflator pump control circuit and the working method of inflator pump, and same section repeats no more.
See also Fig. 3, be the theory diagram of a specific embodiment of inflator pump control circuit of the present invention.In Fig. 3, in order to map conveniently, two power subsystems and two power protection unit are shown in the drawings; yet; in fact, about two power subsystems represent is same power subsystem 31, about two power protection unit represent also is same power protection unit 34.
Inflator pump control circuit of the present invention comprises: a power subsystem 31, a control unit 32, two selector switches 331,332, power protection unit 34, an aeration speed control unit 35 and an on and off switch 36.
Wherein, power subsystem 31 is used to unit that running voltage is provided.This power subsystem 31 can be with behind the blood pressure lowering of the process of the phase line (live line) voltage in the electrical network, the rectifying and wave-filtering, changes the required running voltage of each circuit into; Also can be direct voltage source (for example ,+6V power supply).
Selector switch 331,332 has four terminals, be respectively input, outfan, earth terminal and control end, wherein, outfan can optionally be connected with input or be connected with earth terminal or disconnect (neither be connected with input, be not connected with earth terminal again).Selector switch 331,332 input are connected with power subsystem 31, and selector switch 331,332 outfan are connected with inflator pump, and selector switch 331,332 control end are connected with control unit 32, and selector switch 331,332 earth terminal are connected with ground.In use, selector switch 331,332 outfan are connected with input according to the selection signal-selectivity ground from control unit 32 or are connected with earth terminal or disconnect.
Inflator pump is when work, and the coil of inflator pump can produce backward voltage, and this backward voltage can cause damage to power subsystem 31, therefore, power protection unit 34 is set between power subsystem 31 and inflator pump, so that power subsystem 31 is protected.Power protection unit 34 directly is connected between power subsystem 31 and the inflator pump.
Among the present invention, aeration speed control unit 35 is aeration speeds of controlling inflator pump by the time that the control electric current flows through inflator pump.Therefore, in actual applications, as long as aeration speed control unit 35 is arranged on the position that the current path of inflator pump can be switched on or switched off, as: aeration speed control unit 35 can be arranged between selector switch 331,332 the earth terminal and ground, perhaps be arranged between power subsystem 31 and selector switch 331,332 the input, perhaps be arranged between inflator pump and selector switch 331,332 the outfan.
On and off switch 36 is used for controlling the break-make of whole inflator pump control circuit and power supply, is equivalent to battery main switch.Bring into use the electronic blood pressure timing, at first on and off switch 36 is being connected, turning to again other operations such as control, aeration speed control.Finish to use the electronic blood pressure timing, as long as on and off switch 36 is disconnected, just can prevent the maloperation of control unit 32 or aeration speed control unit 35 and make the inflator pump error running.
The below introduces the topology diagram of inflator pump control circuit, sees also Fig. 4.
Wherein, power subsystem 31 comprises power supply, the first resistance R 1, the second resistance R 2, K switch 1 and Voltage stabilizing module.
Selector switch 331,332 comprises P channel depletion type field effect transistor (hereinafter referred to as the first a field effect transistor) T1, the 2nd P channel depletion type field effect transistor (hereinafter referred to as the 4th field effect transistor) T4, N channel depletion type field effect transistor (hereinafter referred to as the second a field effect transistor) T2 and the 2nd N channel depletion type field effect transistor (hereinafter referred to as the 3rd field effect transistor) T3, wherein, the first field effect transistor T1 and the second field effect transistor T2 form the first selector switch 331, the three field effect transistor T3 and the 4th field effect transistor T4 forms the second selector switch 332.
Aeration speed control unit 35 comprises the 7th resistance R 7, the 8th resistance R 8, the second capacitor C 2 and the 5th field effect transistor T5.
On and off switch 36 comprises the 9th resistance R 9 and the 6th field effect transistor T6.
The following describes the annexation of each electronic component in power subsystem 31, control unit 32, selector switch 331,332, power protection unit 34, aeration speed control unit 35 and the on and off switch 36.Inflator pump uses the voltage of 5V in the present embodiment.
Power supply is+power supply of 6V in the power subsystem 31, also can be other dc source greater than+6V, and power supply is by the input Vin of the first resistance R 1 rear access Voltage stabilizing module.After the second resistance R 2 and K switch 1 series connection, the opposite end that the opposite end that the second resistance R 2 is connected with K switch 1 and K switch 1 are connected with the second resistance R 2 meets respectively input Vin and the output end vo ut of Voltage stabilizing module, is about to after the second resistance R 2 and K switch 1 series connection in parallel with Voltage stabilizing module.In this power subsystem 31, the second resistance R 2 is short-circuit resistance.When the voltage of power supply during greater than the required voltage of inflator pump, cut-off switch K1 provides voltage for inflator pump and other electronic component that need to power from the voltage of power supply after the Voltage stabilizing module blood pressure lowering.When the voltage of power supply equaled the required voltage of inflator pump, turn on-switch K1 can directly provide voltage through the second resistance R 2 to inflator pump and other electronic component that need to power from the voltage of power supply.This mode of directly being powered by the second resistance R 2 can reduce Voltage stabilizing module to the loss of electric energy, thereby improves the efficient of power supply.Voltage stabilizing module can adopt the manostat 1117-3.3V of AMS company in the present embodiment.
In selector switch 331,332, the first field effect transistor T1 is connected with the first terminals 1 of inflator pump as the outfan of the first selector switch 331 after the drain electrode of field effect transistor T2 links to each other with being connected, and the drain electrode of the 3rd field effect transistor T3 and the 4th field effect transistor T4 is continuous to be connected with the second terminals 2 of inflator pump as the outfan of the second selector switch 332 afterwards.The source electrode of the first field effect transistor T1 and the 4th field effect transistor T4 links to each other with the output end vo ut of Voltage stabilizing module as the input of the first selector switch 331 and the second selector switch 332 respectively.The source electrode of the second field effect transistor T2 and the 3rd field effect transistor T3 respectively as the first selector switch 331 be connected the earth terminal of selector switch 332 and be connected with the source electrode of the 5th field effect transistor T5.The first field effect transistor T1 be connected the grid of field effect transistor T2 connect after as the control end of the first selector switch 331, after the grid of the 3rd field effect transistor T3 and the 4th field effect transistor T4 connects as the control end of the second selector switch 332.
In control unit 32, the base stage of the first audion Q1 is connected with the Q outfan of d type flip flop by the 6th resistance R 6, the colelctor electrode of the first audion Q1 is connected with the grid of the 3rd field effect transistor T3 and the 4th field effect transistor T4, link to each other with the output end vo ut of Voltage stabilizing module by the 5th resistance R 5 simultaneously, the emitter stage of the first audion Q1 is connected with the casing of electric sphygmomanometer.The base stage of the second audion Q2 by the 4th resistance R 4 and d type flip flop /the Q outfan is connected, the colelctor electrode of the second audion Q2 and the first field effect transistor T1 be connected the grid of field effect transistor T2 and be connected, link to each other with the output end vo ut of Voltage stabilizing module by the 3rd resistance R 3 simultaneously, the emitter stage of the second audion Q2 is connected with the casing of electric sphygmomanometer.
In power protection unit 34, the anode of the negative electrode of the first diode D1 and the second diode D2 is connected with the first terminals 1 of inflator pump, and the anode of the negative electrode of the 3rd diode D3 and the 4th diode D4 is connected with the second terminals 2 of inflator pump.The anode of the first diode D1 and the 3rd diode D3 is connected with the casing of electric sphygmomanometer.The negative electrode of the second diode D2 and the 4th diode D4 is connected with the output end vo ut of Voltage stabilizing module, simultaneously, is connected with the casing of electric sphygmomanometer by the first capacitor C 1.
In aeration speed control unit 35, the grid of the 5th field effect transistor T5 is connected with the TXA0 outfan (not shown) of the first microcontroller with the 8th resistance R 8 by the 7th resistance R 7, and by the speed control signal unit output speed control signal in the first microcontroller.The source electrode of the 5th field effect transistor T5 is connected with the source electrode of the 3rd field effect transistor Q3, and the drain electrode of the 5th field effect transistor T5 is connected with the source electrode of the 6th field effect transistor T6.One end of the second capacitor C 2 is connected with the 8th resistance R 8 interconnective ends with the 7th resistance R 7, and the other end of the second capacitor C 2 is connected with the source electrode of the 5th field effect transistor T5.In use, the first microcontroller is to the 5th field effect transistor T5 output PWM modulating wave.The second capacitor C 2 can be removed some noises (sharp wave) from the first microcontroller, avoids affecting owing to the noise in the circuit time of conducting or the cut-off of the 5th field effect transistor T5, to control better the aeration speed of inflator pump.
The grid of the 6th field effect transistor T6 in the on and off switch 36 is connected with the PUMPC outfan (not shown) of the first microcontroller by the 9th resistance R 9, and the signal that is switched on or switched off by the power control unit out-put supply in the first microcontroller, the source electrode of the 6th field effect transistor T6 is connected with the drain electrode of the 5th field effect transistor T5, and the drain electrode of the 6th field effect transistor T6 is connected with the casing of electric sphygmomanometer.
The operation principle of the inflator pump control circuit that present embodiment provides and the working method of inflator pump are as follows:
When the user uses the electronic blood pressure timing, at first send Continuity signal by the first microcontroller to the grid of the 5th field effect transistor T5 and the 6th field effect transistor T6, make source electrode and the drain electrode conducting of the 5th field effect transistor T5 and the 6th field effect transistor T6.Then by d type flip flop to selector switch 331,332 send the selection signal, if the Q outfan of d type flip flop output high level (being Q=1), / Q outfan output low level (namely/Q=0), then the first audion Q1 conducting, the second audion Q2 cut-off, thereby make the second field effect transistor T2, the 4th field effect transistor T4 conducting, and the first field effect transistor T1, the 3rd field effect transistor T3 cut-off, at this moment, the flow direction of electric current is: from power supply, the 4th field effect transistor T4 successively flows through, the second terminals 2 of inflator pump, the first terminals 1 of inflator pump, the second field effect transistor T2, the 5th field effect transistor T5 and the 6th field effect transistor T6, last inflow place (being cabinet).If the Q outfan output low level (being Q=0) of d type flip flop, / Q outfan output high level (namely/Q=1), then the first audion Q1 cut-off, the second audion Q2 conducting, thereby make the second field effect transistor T2, the 4th field effect transistor T4 cut-off, and the first field effect transistor T1, the 3rd field effect transistor T3 conducting, at this moment, the flow direction of electric current is: from power supply, the first field effect transistor T1 successively flows through, the first terminals 1 of inflator pump, the second terminals 2 of inflator pump, the 3rd field effect transistor T3, the 5th field effect transistor T5 and the 6th field effect transistor T6, last inflow place (being cabinet).By control unit 32 and selector switch 331,332 cooperatively interact, make electric current can bidirectional flow through inflator pump, be that electric current can flow to from the first terminals 1 of inflator pump the second terminals 2 of inflator pump or flow to the first terminals 1 of inflator pump from the second terminals 2 of inflator pump, make the inflator pump can forward rotation or backward rotation, thereby reduce inflator pump load shock power in one direction, and then improve the service life of inflator pump.
In the present embodiment, R1, the resistance of R2 is 1.5K ± 0.1%, R3, R4, R5, R6, the resistance of R9 is 10K ± 1%, the resistance of R7 is 100 ± 1%, the resistance of R8 is 1K ± 1%, D1～D4 chooses the diode that model is MBR0520, C1 chooses the electric capacity of 10UF ± 20%, C2 chooses the electric capacity of 0.001UF ± 20%, T1, T4 chooses the field effect transistor that model is SSM3JO2F, T2, T3 chooses the field effect transistor that model is SSM3K02F, T5, T6 chooses the field effect transistor that model is IRFU024N, Q1, Q2 chooses the audion that model is MMBT2222A, and the model of d type flip flop is 74HC74.
Need to prove that present embodiment is the rotating speed of controlling inflator pump by the time of the disconnection of the 5th field effect transistor T5 or conducting and conducting, and then the speed of control inflation.Because inflator pump after energized, at first will through a boost phase, just reach the rated speed stage of inflator pump afterwards, namely enter the uniform rotation stage, corresponding with it, inflator pump is when disconnecting with power supply, inflator pump also has decelerating phase lentamente, afterwards rotating speed vanishing.Therefore, when the ON time of the 5th field effect transistor T5 more in short-term, the rotating speed of inflator pump is slower, thereby aeration speed is slower.When the ON time of the 5th field effect transistor T5 surpassed sometime section, the rotating speed of inflator pump reached rated speed, and this moment, aeration speed was the fastest.When aeration speed comparatively fast needs to reduce aeration speed, can disconnect the 5th field effect transistor T5, make the rotating speed slow decreasing of inflator pump, aeration speed is slow decreasing thereupon also, if need accelerate aeration speed this moment again, then can again make the 5th field effect transistor T5 conducting, improve the rotating speed of inflator pump, again accelerate aeration speed with this.In use, can according to actual needs, select the 5th field effect transistor T5 disconnection or conducting and ON time to regulate aeration speed.
Also need to prove, used field effect transistor in each selector switch 331,332, one is the field effect transistor of high potential conducting, another is the field effect transistor of electronegative potential conducting, when from the electric potential signal input selector switch 331 of control unit 32,332 the time, two one of them conductings of field effect transistor are so that selector switch 331,332 outfan optionally is connected with power subsystem 31 or connect with ground.In addition, two selector switches 331,332 outfan can not be selected to be connected with power subsystem 31 simultaneously, that is to say, when the field effect transistor conducting that is connected with power supply in the first selector switch 331, the field effect transistor that is connected with power supply in the second selector switch 332 should be ended, otherwise whole inflator pump control circuit can not consist of path, and inflator pump can not be worked.Similarly, two selector switches 331,332 outfan can not be selected the field effect transistor conducting that is connected with ground simultaneously, otherwise inflator pump can't be worked.
Be understandable that employed field effect transistor also can adopt the enhancement mode field effect transistor in the selector switch of present embodiment, to realize selecting the mode of connection.Similarly, the 5th field effect transistor T5 and the 6th field effect transistor T6 also can be depletion field effect transistor or enhancement mode field effect transistor.
In addition, the connected mode of the source electrode of employed field effect transistor and drain electrode can Opposite direction connection in the present embodiment, the electronic component that is about to link to each other with drain electrode in above-described embodiment is received on the source electrode, and the electronic component that is connected with source electrode in above-described embodiment is received in the drain electrode, in any case connect, can realize purpose of the present invention.
In addition, in above-described embodiment, the electronic component that is connected with the electric sphygmomanometer casing also can directly be connected with ground, so that the inflator pump control circuit consists of the loop.
Inflator pump control circuit provided by the invention can be applied to hand-held non-invasive blood pressure measuring, the monitor with the blood pressure function, non-invasive blood pressure module and desk-top non-invasive blood pressure measuring, as long as be used for Measure blood pressure and control inflator pump with the inflator pump control circuit that the device of blood pressure relevant parameters can be used above-described embodiment, and can make equally inflator pump realize rotating forward or backwards, prolong the service life of inflator pump, thus the service life of improving this device.
Will also be appreciated that above embodiment only is the illustrative embodiments that adopts for principle of the present invention is described, yet the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement also are considered as protection scope of the present invention.
Claims (12)
1. inflator pump control circuit, the running status that is used for the control inflator pump, being included as inflator pump provides power supply and the on and off switch of electric energy, characterized by further comprising a control unit and two selector switches, each described selector switch has the input that is connected with described power supply, the outfan that is connected with inflator pump, earth terminal and the control end that is connected with described control unit, the outfan of described two selector switches is connected with terminals of inflator pump respectively, the outfan of described selector switch is selectively connected with input or the earth terminal of described selector switch according to the selection signal from described control unit, and, when the input of the outfan of the first selector switch and this selector switch or earth terminal were connected, the outfan of the second selector switch was correspondingly connected with earth terminal or the input of this selector switch.
2. inflator pump control circuit according to claim 1, it is characterized in that, each described selector switch comprises two field effect transistor that the conducting current potential is different, wherein, the source/drain of the first field effect transistor is as the input of described selector switch, the drain/source of described the first field effect transistor is connected with the source/drain of the second field effect transistor and as the outfan of described selector switch, the drain/source of described the second field effect transistor is as the earth terminal of described selector switch, and the grid of described two field effect transistor connects rear control end as described selector switch.
3. inflator pump control circuit according to claim 2 is characterized in that, described two field effect transistor can be N channel field-effect pipe or P-channel field-effect transistor (PEFT) pipe.
4. inflator pump control circuit according to claim 1, it is characterized in that, described control unit comprises a trigger and two audions, the base stage of described two audions is connected with two outfans of described trigger respectively, the colelctor electrode of described two audions is connected with the control end of described two selector switches respectively, the emitter stage of described two audions is all connected with ground, and described trigger is exported high and low level signal and made conducting in described two audions and another cut-off.
5. inflator pump control circuit according to claim 4 is characterized in that, described trigger is rest-set flip-flop or JK flip-flop or d type flip flop.
6. inflator pump control circuit according to claim 1, it is characterized in that, between described power supply and described selector switch, also be provided with the first short-circuit resistance and Voltage stabilizing module, described Voltage stabilizing module connects by the described power supply of described the first short-circuit resistance, and the outfan of described Voltage stabilizing module is connected with the input of described two selector switches.
7. inflator pump control circuit according to claim 6, it is characterized in that, between described power supply and described selector switch, also be provided with the second short-circuit resistance and connecting valve, one end of described the second short-circuit resistance is connected with the outfan of described Voltage stabilizing module, its other end is connected with the input of described Voltage stabilizing module, and described connecting valve is arranged between the input and described the second short-circuit resistance of described Voltage stabilizing module.
8. inflator pump control circuit according to claim 1; it is characterized in that; described control circuit also comprises the power protection unit; this power protection unit comprises four diodes; wherein; the negative electrode of the first diode be connected the anode of diode and be connected with terminals of described inflator pump; the anode of the negative electrode of the 3rd diode and the 4th diode is connected with another terminals of described inflator pump; the plus earth of the anode of the first diode and the 3rd diode, the negative electrode of the negative electrode of the second diode and the 4th diode is connected with power supply.
9. inflator pump control circuit according to claim 8 is characterized in that, described power protection unit also comprises protection electric capacity, and described protection electric capacity is arranged between the negative electrode and ground of described the second diode.
10. the described inflator pump control circuit of any one according to claim 1-9, it is characterized in that, described inflator pump control circuit also comprises the aeration speed control unit, described aeration speed control unit comprises the speed control signal unit, the 7th resistance and the 5th field effect transistor, the source electrode of described the 5th field effect transistor is connected with ground with the input of described selector switch respectively with being connected, the grid of described the 5th field effect transistor is connected with an end of described the 7th resistance, the other end of described the 7th resistance is connected with described speed control signal unit, and described speed control signal unit is used for providing the speed control signal that is switched on or switched off to described the 5th field effect transistor.
11. inflator pump control circuit according to claim 10, it is characterized in that, described aeration speed control unit also comprises filter capacitor and the 8th resistance, one end of described the 8th resistance is connected with a described end of described the 7th resistance, the other end of described the 8th resistance is connected with the grid of described the 5th field effect transistor, described filter capacitor one end is connected with the interconnective end of described the 7th resistance and the 8th resistance, and its other end is connected with ground.
12. electric sphygmomanometer, comprise inflator pump and inflator pump control unit, described inflator pump control unit is controlled the direction of rotation of described inflator pump, it is characterized in that, the topological structure of described inflator pump control unit is the described inflator pump control circuit of any one among the claim 1-11.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010175335 CN101881267B (en) | 2010-05-12 | 2010-05-12 | Air pump control circuit and electronic sphygmomanometer |
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| CN 201010175335 CN101881267B (en) | 2010-05-12 | 2010-05-12 | Air pump control circuit and electronic sphygmomanometer |
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| CN101881267A CN101881267A (en) | 2010-11-10 |
| CN101881267B true CN101881267B (en) | 2013-02-20 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104970785A (en) * | 2015-06-29 | 2015-10-14 | 张桂花 | Bidirectionally-wrapping blood pressure measuring device |
| CN105030221A (en) * | 2015-07-31 | 2015-11-11 | 苏州玄禾物联网科技有限公司 | Power source control system of portable non-invasive blood pressure monitor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2429107Y (en) * | 2000-07-12 | 2001-05-09 | 无锡市中健科仪有限公司 | Electronic sphygmomanometer with sectional aerator |
| CN1923134A (en) * | 2005-08-30 | 2007-03-07 | 潘卫江 | Electronic sphygmomanometer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080242348A1 (en) * | 2007-03-28 | 2008-10-02 | Hsu Kent T J | Mobile phone with vital signs measurement and display capabilities |
| DE112009001212T5 (en) * | 2008-05-22 | 2011-03-24 | Omron Healthcare Co., Ltd. | Blood Pressure Monitor |
| JP2010094410A (en) * | 2008-10-20 | 2010-04-30 | Omron Healthcare Co Ltd | Blood pressure manometer |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2429107Y (en) * | 2000-07-12 | 2001-05-09 | 无锡市中健科仪有限公司 | Electronic sphygmomanometer with sectional aerator |
| CN1923134A (en) * | 2005-08-30 | 2007-03-07 | 潘卫江 | Electronic sphygmomanometer |
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| Title |
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| JP特开2010-94410A 2010.04.30 |
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