CN208849505U - Medical Devices with hysteresis module - Google Patents
Medical Devices with hysteresis module Download PDFInfo
- Publication number
- CN208849505U CN208849505U CN201821682471.5U CN201821682471U CN208849505U CN 208849505 U CN208849505 U CN 208849505U CN 201821682471 U CN201821682471 U CN 201821682471U CN 208849505 U CN208849505 U CN 208849505U
- Authority
- CN
- China
- Prior art keywords
- voltage
- module
- threshold value
- medical devices
- voltage threshold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Present disclose provides a kind of Medical Devices with hysteresis module, comprising: hysteresis module, it has the output end of the input terminal for receiving first voltage and output second voltage, hysteresis module has first voltage threshold value and the second voltage threshold value less than first voltage threshold value, and it is based on first voltage, first voltage threshold value and second voltage threshold value, exports second voltage；Switching module is used to receive second voltage, carries out pattern switching based on second voltage, and export control signal；And functional module, there is the first end connecting via hysteresis module with switching module and receive the second end of control signal, second end receives control signal, and determines whether to be communicated with switching module based on control signal.In the disclosure, be able to suppress Medical Devices be switched on or switched off external power supply transient voltage fluctuation caused by pattern switching unsteady phenomena even result in Medical Devices crash problem.
Description
Technical field
This disclosure relates to technical field of medical equipment, more specifically to a kind of Medical Devices with hysteresis module.
Background technique
In many Medical Devices with rechargeable battery, it is usually provided with charge mode and two kinds of non-charging mode work
Mode, and realize by switching module (such as judgement of threshold voltage) switching of both operational modules.When medical treatment is set
When for being charged by interface such as serial communication bus (USB) access external power supply, the switching module of Medical Devices will be cured
It treats equipment and switches to charge mode, external power supply can charge to Medical Devices at this time；When Medical Devices and external power supply
When disconnection, the switching module of Medical Devices is communicated with the functional module of Medical Devices, and Medical Devices are now in non-charging mode.
However, be switched on or switched off the moment of external power supply in Medical Devices, due in circuit there are disturbing factors such as noises,
The charging voltage of Medical Devices is possible to change and with fluctuation.Especially when the input voltage of Medical Devices is changed to
When the near threshold voltage of switching module, the fluctuation of voltage is likely to result in Medical Devices and is in the unstable of continuous switch mode
State may cause Medical Devices crash when serious.
Summary of the invention
The disclosure is made in view of above-mentioned situation, is able to suppress Medical Devices its purpose is to provide one kind and is existed
It is switched on or switched off pattern switching unsteady phenomena caused by the transient voltage fluctuation of external power supply power supply to improve Medical Devices
Reliability the Medical Devices with hysteresis module.
For this purpose, present disclose provides a kind of Medical Devices with hysteresis module, the Medical Devices include charge mode
And non-charging mode characterized by comprising hysteresis module has the second electricity of the input terminal for receiving first voltage and output
The output end of pressure, the hysteresis module have first voltage threshold value and the second voltage threshold value less than the first voltage threshold value,
And it is based on the first voltage, the first voltage threshold value and the second voltage threshold value, exports the second voltage；Switching
Module is used to receive the second voltage, and the mode for carrying out charge mode or non-charging mode based on the second voltage is cut
It changes, and exports the first control signal based on the charge mode or the second control signal based on the non-charging mode；With
And functional module, there is the first end that connect via the hysteresis module with the switching module and reception described the
The second end of one control signal or the second control signal, it is described when the second end receives the first control signal
Functional module is communicated with switching module stopping, and the Medical Devices are in the charge mode, when the second end receives
When the second control signal, the functional module is communicated via the hysteresis module with the switching module, described
Medical Devices are in the non-charging mode.
In the disclosure, hysteresis module receives first voltage and according to first voltage threshold value, second voltage threshold value and first
Voltage output second voltage, switching module according to second voltage carry out pattern switching, functional module via hysteresis module and with cut
Mold changing block connects and receives control signal, and functional module is based on control signal and determines whether to be communicated with switching module.
Thereby, it is possible to inhibit Medical Devices to be switched on or switched off the unstable shape of pattern switching caused by the transient voltage fluctuation of external power supply
Condition even results in Medical Devices crash problem.
In the disclosure in related Medical Devices, optionally, when the first voltage is greater than or equal to described first
When voltage threshold, the non-charging mode is switched to the charge mode by the switching module；When the first voltage is less than
Or when being equal to the second voltage threshold value, the charge mode is switched to the non-charging mode by the switching module；Work as institute
First voltage is stated less than the first voltage threshold value and when being greater than the second voltage threshold value, the switching module keeps current mould
Formula.In this case, pattern switching can be made steadily to carry out.
In addition, optionally, the hysteresis module is reverse phase hysteresis circuitry in Medical Devices involved in the disclosure.
In this case, there are two threshold values for reverse phase hysteresis circuitry, and the pattern switching based on two threshold values is than the mould based on single threshold value
Formula switching is more stable.
In addition, optionally, the hysteresis module is positive hysteresis circuitry in Medical Devices involved in the disclosure.
In this case, for positive hysteresis circuitry there are two threshold value, the pattern switching based on two threshold values is more stable.
In addition, in Medical Devices involved in the disclosure, optionally, when the first voltage is more than or equal to described
When first voltage threshold value, the second voltage is low level, and the switching module receives the low level, by the non-charging mould
Formula is switched to the charge mode；When the first voltage is less than or equal to the second voltage threshold value, the second voltage
For high level, the switching module receives the high level, the charge mode is switched to the non-charging mode；When described
When first voltage is less than the first voltage threshold value and is greater than the second voltage threshold value, the switching module keeps current mould
Formula.Thus, it is ensured that Medical Devices are in charge mode under relatively large voltage.
In addition, in Medical Devices involved in the disclosure, optionally, when the first voltage is more than or equal to described
When first voltage threshold value, the second voltage is high level, and the switching module receives the high level, by the non-charging mould
Formula is switched to the charge mode；When the first voltage is less than or equal to the second voltage threshold value, the second voltage
For low level, the switching module receives the low level, the charge mode is switched to the non-charging mode；When described
When first voltage is less than the first voltage threshold value and is greater than the second voltage threshold value, the switching module keeps current mould
Formula.Thus, it is ensured that Medical Devices are in non-charging mode under relatively small voltage.
In addition, optionally, the reverse phase hysteresis circuitry includes the first partial pressure in Medical Devices involved in the disclosure
Resistance, the second divider resistance, input resistance, feedback resistance, pull-up resistor and comparator, the comparator are inputted with positive
End, inverting input terminal, positive power source terminal, negative power end and output end；The first end of first divider resistance and the function mould
The first end of block connects, the first end of the second end of first divider resistance and second divider resistance and described anti-
The connection of phase input terminal, the second end ground connection of second divider resistance；The first end of the input resistance and the negative power end
Connection, the second end of the input resistance are connect with the first end of the feedback resistance and the normal phase input end, the feedback
The second end of resistance is connect with the output end of the comparator, and the first end of the pull-up resistor connects to power supply, the pull-up
The second end of resistance is connect with the output end of the comparator.In this case, Medical Devices connection can be further suppressed
Or pattern switching unsteady phenomena caused by the transient voltage fluctuation of disconnection external power supply even results in Medical Devices crash and asks
Topic.
In addition, optionally, the Medical Devices are fundus camera in Medical Devices involved in the disclosure.At this
In the case of kind, be able to suppress when fundus camera is switched on or switched off external power supply power supply because caused by transient voltage is unstable mode cut
Change unsteady phenomena.
In addition, optionally, the non-charging mode is usb host mode in Medical Devices involved in the disclosure
Or one of USB device mode.In this case, under non-charging mode, functional module is able to carry out logical with switching module
Letter.
In addition, optionally, the hysteresis module passes through USB interface and institute in Medical Devices involved in the disclosure
State switching module connection.In this case, hysteresis module is electrically connected with switching module by USB interface realization.
It enables to Medical Devices steadily to carry out pattern switching according to the disclosure, compared with prior art, is able to suppress
Medical Devices pattern switching unsteady phenomena caused by the transient voltage fluctuation for being switched on or switched off external power supply power supply, thus
It can be improved the reliability of Medical Devices.
Detailed description of the invention
Embodiment of the disclosure will be explained in further detail solely by reference to the example of attached drawing now, in which:
Fig. 1 is to show a kind of primary structure block diagram of the Medical Devices with hysteresis module involved in the disclosure.
Fig. 2 is to show the schematic diagram of the hysteresis module in Medical Devices involved in the disclosure.
Fig. 3 is to show the schematic diagram of the output waveform of the hysteresis module in Medical Devices involved in the disclosure.
Fig. 4 is to show the schematic diagram of the variation 1 of the hysteresis module in Medical Devices involved in the disclosure.
Fig. 5 is showing for the output waveform for the variation 1 for showing the hysteresis module in Medical Devices involved in the disclosure
It is intended to.
Fig. 6 is to show the schematic diagram of the variation 2 of the detection hysteresis module in Medical Devices involved in the disclosure.
Specific embodiment
Hereinafter, explaining the preferred embodiment of the disclosure in detail with reference to attached drawing.In the following description, for identical
Component assign identical symbol, the repetitive description thereof will be omitted.Scheme in addition, attached drawing is only schematical, the mutual ruler of component
Very little shape of ratio or component etc. can be with actual difference.
It should be noted that term " includes " and " having " and their any deformation in the disclosure, such as wrapped
Include or the process, method, system, product or equipment of possessed a series of steps or units are not necessarily limited to be clearly listed that
A little step or units, but may include or with being not clearly listed or for these process, methods, product or equipment
Intrinsic other step or units.Those skilled in the art will appreciate that can be used in the practice of the disclosure with disclosure institute
The similar or equivalent many methods and material of those of description.In fact, the disclosure is never limited to described method and material.
In addition, below the disclosure subhead involved in description etc. be not meant to limit the present invention in perhaps model
It encloses, is merely possible to the suggesting effect read.Such subhead can neither be interpreted as the content for dividing article, also not
Content under subhead should be limited only in the range of subhead.Unless otherwise defined, technology used in the disclosure and
Scientific term, which has, is generally understood identical meaning with disclosure those of ordinary skill in the art.
Fig. 1 is to show a kind of primary structure block diagram of the Medical Devices with hysteresis module involved in the disclosure.
Medical Devices 1 (sometimes can abbreviation Medical Devices 1) involved in the disclosure with hysteresis module 10 can wrap
Include charge mode and non-charging mode.In the present embodiment, it when Medical Devices 1, which access external power supply, to be charged, is based on
The output of hysteresis module 10 is as a result, Medical Devices 1 can be switched to charge mode by the switching module 20 of Medical Devices 1, at this time
External power supply can charge to Medical Devices 1；When Medical Devices 1 and external power supply disconnect, based on hysteresis module 10
As a result, the switching module 20 of Medical Devices 1 can be communicated with the functional module 30 of Medical Devices 1, Medical Devices 1 are located at this time for output
It (is described later on) in non-charging mode.In some instances, Medical Devices 1 for example can be fundus camera.
In some instances, as shown in Figure 1, Medical Devices 1 may include hysteresis module 10, switching module 20 and function mould
Block 30.Hysteresis module 10 can receive first voltage Vin and according to first voltage threshold value Vth, second voltage threshold value Vtl and first
Voltage Vin exports second voltage Vout (referring to fig. 2).Switching module 20 can carry out pattern switching according to second voltage Vout,
And generate control signal.Functional module 30 can determine whether to be communicated with switching module 20 based on control signal.
(hysteresis module)
In the present embodiment, in Medical Devices 1, hysteresis module 10 can have the input for receiving first voltage Vin
End.Wherein, first voltage Vin can be the input voltage of Medical Devices 1.In some instances, first voltage Vin can be 5V
Any voltage value into 5.5V.For example, first voltage Vin can be 5.1V, 5.2V or 5.5V.
In some instances, when Medical Devices 1 connect external power supply, the input terminal and external power supply of hysteresis module 10 connect
It connects.At this point, first voltage Vin is provided by external power supply.First voltage Vin can be used as the charging electricity to charge for Medical Devices 1
Pressure.
In the present embodiment, hysteresis module 10 can have the output end of output second voltage Vout.Wherein, the second electricity
Pressure Vout can be hysteresis module 10 and be obtained based on the received first voltage Vin of its input terminal and the voltage threshold of hysteresis module 10
's.Wherein, the voltage threshold of hysteresis module 10 may include first voltage threshold value Vth and less than the of first voltage threshold value Vth
Two voltage threshold Vtl namely Vth > Vtl.Specifically, hysteresis module 10 can receive first voltage Vin, and can incite somebody to action
First voltage Vin is compared with first voltage threshold value Vth or second voltage threshold value Vtl, then by comparison result with second
The form of voltage Vout exports.Second voltage Vout can be selected from one in high level or low level.Wherein, high level refers to
It is the high voltage opposite with low level.
Fig. 2 is to show the schematic diagram of the hysteresis module in Medical Devices involved in the disclosure.Fig. 3 is to show this public affairs
The schematic diagram of the output waveform of hysteresis module in Medical Devices involved in opening.In present embodiment Fig. 2 shows sluggish mould
Block 10 can be reverse phase hysteresis circuitry.
In some instances, as shown in Fig. 2, hysteresis module 10 may include resistance R1, input resistance R2, feedback resistance
Rf, pull-up resistor Rp and comparator T.Wherein, the inverting input terminal of the comparator T in hysteresis module 10 can connect resistance R1's
First end.The second end of resistance R1 can receive first voltage Vin.Since resistance R1 is not divided, therefore the second end of resistance R1
Voltage value is identical with the voltage value of the first end of resistance R1.Wherein, the inverting input terminal namely hysteresis module 10 of comparator T is defeated
Enter end.
In some instances, as shown in Fig. 2, the normal phase input end of the comparator T in hysteresis module 10 can connect input
The first end of resistance R2.The second end of input resistance R2 can access reference voltage Vref.For example, reference voltage Vref can be
The reference voltage of 1V to 2V, present embodiment are without being limited thereto.
In some instances, as shown in Fig. 2, the normal phase input end of the comparator T in hysteresis module 10 can connect feedback
The first end of resistance Rf.The second end of feedback resistance Rf can be connect with the output end of comparator T.The output end of comparator T
That is the output end of hysteresis module 10.The second end of feedback resistance Rf can be connect with the first end of pull-up resistor Rp.Pull-up resistor
The second end of Rp can be connect with power supply Vp.Pull-up resistor Rp can ensure the output end output high level of hysteresis module 10.
Based on above-mentioned it is found that hysteresis module 10 can receive first voltage Vin, and can be by first voltage Vin and
One voltage threshold Vth or second voltage threshold value Vtl are compared, specifically, when first voltage Vin is greater than or equal to the first electricity
When pressing threshold value Vth, the voltage value of the normal phase input end of comparator T is second voltage threshold value Vtl at this time, and what comparator T compared is
First voltage Vin and second voltage threshold value Vtl.When first voltage Vin from large to small when, if first voltage Vin less than second electricity
Threshold value Vtl is pressed, the voltage value jump of the normal phase input end of comparator T is first voltage threshold value Vth at this time, and comparator T compares
It is first voltage Vin and first voltage threshold value Vth.When first voltage Vin is less than or equal to second voltage threshold value Vtl, at this time
The voltage value of the normal phase input end of comparator T is first voltage threshold value Vth, and that comparator T compares is first voltage Vin and first
Voltage threshold Vth.When first voltage Vin changes from small to big, if first voltage Vin is greater than first voltage threshold value Vth, compare at this time
The voltage value jump of the normal phase input end of device T is second voltage threshold value Vtl, and that comparator T compares is first voltage Vin and second
Voltage threshold Vtl.
In some instances, first voltage threshold value Vth and second voltage threshold value Vtl can be by constituting the electricity of hysteresis module 10
Road (such as component in circuit) obtains.Based on hysteresis module 10 shown in Fig. 2, first voltage threshold value Vth can be such as formula
(1) shown in:
Wherein, R2 can be input resistance, and Rf can be feedback resistance, and Rp can be pull-up resistor.Vref can be ginseng
Examine voltage.Vp can be power supply.
Based on hysteresis module 10 shown in Fig. 2, second voltage threshold value Vtl can be as shown in formula (2):
Wherein, the difference between first voltage threshold value Vth and second voltage threshold value Vtl is hysteresis voltage VHYST, sluggish electricity
Press VHYSTIt can be as shown in formula (3):
In the present embodiment, the fluctuation range of usual first voltage Vin is than hysteresis voltage VHYSTRange it is small.When first
After voltage Vin is greater than or equal to first voltage threshold value Vth, comparator T exports low level, if first voltage Vin is in first voltage
Threshold value Vth is nearby fluctuated, since fluctuation range is less than hysteresis voltage VHYSTRange, therefore generally is not in first voltage Vin
The situation smaller than second voltage threshold value Vtl, therefore, comparator T can keep output low level, until first voltage Vin is less than
Or after being equal to second voltage threshold value Vtl, comparator T exports high level.Hysteresis module 10 can steadily export high level as a result,
Or low level.
In some instances, sluggish as shown in figure 3, when first voltage Vin is greater than or equal to first voltage threshold value Vth
The second voltage Vout of the output end output of comparator T in module 10 is low level Vol.When first voltage Vin is less than or waits
When second voltage threshold value Vtl, the second voltage Vout of the output end output of the comparator T in hysteresis module 10 is high level
Voh.Ratio when first voltage Vin is less than first voltage threshold value Vth and is greater than second voltage threshold value Vtl, in hysteresis module 10
The second voltage Vout of output end output compared with device T keeps previous level.
(switching module)
In some instances, as shown in Figure 1, Medical Devices 1 may include switching module 20.The first end of switching module 20
It can connect the output end of hysteresis module 10.In some instances, in the case where Medical Devices 1 are fundus camera, switch mould
Block 20 can be the main control chip of fundus camera.For example, main control chip can also integrate the display core of fundus camera display portion
Piece.
In some instances, switching module 20 can receive second voltage Vout, and be carried out based on second voltage Vout
The pattern switching of charge mode or non-charging mode.As described above, hysteresis module 10 can steadily export high level or
Low level, therefore, switching module 20 can steadily carry out pattern switching, and are able to solve Medical Devices 1 and switch on and off outside
The moment first voltage Vin of portion's power supply it is unstable caused by cross cutting change unstable situation even result in Medical Devices 1 crash
Problem.
In some instances, based on above-mentioned hysteresis module 10, second voltage Vout and 10 institute of hysteresis module received the
One voltage Vin, the first voltage threshold value Vth of hysteresis module 10 are related with second voltage threshold value Vtl.Switching module 20 can as a result,
To carry out pattern switching based on first voltage Vin, first voltage threshold value Vth and second voltage threshold value Vtl.Wherein, first voltage
Threshold value Vth can be switched to the voltage threshold of charge mode for non-charging mode.Second voltage threshold value Vtl can be charge mode
It is switched to the voltage threshold of non-charging mode.
In some instances, when first voltage Vin is greater than or equal to first voltage threshold value Vth, switching module 20 will be non-
Charge mode is switched to charge mode.In addition, switching module 20 can produce the first control letter of (output) based on charge mode
Number.When first voltage Vin is less than or equal to second voltage threshold value Vtl, charge mode is switched to non-charging by switching module 20
Mode.In addition, switching module 20 can produce the second control signal of (output) based on non-charging mode.As first voltage Vin
When less than first voltage threshold value Vth and being greater than second voltage threshold value Vtl, switching module 20 keeps present mode.In such case
Under, pattern switching can be made steadily to carry out.
In some instances, at hysteresis module 10 as shown in Figure 2, when first voltage Vin is greater than or equal to the
When one voltage threshold Vth, the second voltage Vout that hysteresis module 10 generates is low level Vol, and switching module 20 can receive low
Level Vol, and non-charging mode is switched to charge mode.In addition, switching module 20 can produce based on charge mode
One control signal.When first voltage Vin is less than or equal to second voltage threshold value Vtl, the second voltage of the generation of hysteresis module 10
Vout is high level Voh, and switching module 20 can receive high level Voh, and charge mode is switched to non-charging mode.Separately
Outside, switching module 20 can produce the second control signal based on non-charging mode.
In this case, since the first voltage Vin of charge mode is bigger than the first voltage Vin under non-charging mode.
Thereby, it is possible to ensure that Medical Devices 1 are in charge mode under relatively large voltage or under relatively small voltage
Non-charging mode.
In some instances, the first end of switching module 20 and the output end of hysteresis module 10 can be connected by USB interface
It connects.I.e. switching module 20 can receive the second voltage Vout that hysteresis module 10 exports by USB interface.In this case,
Hysteresis module 10 can be realized by USB interface with switching module 20 and is electrically connected.
(functional module)
In some instances, as shown in Figure 1, Medical Devices 1 may include functional module 30.Functional module 30 may include
The first end that connect via hysteresis module 10 with switching module 20 and receive first control signal or second control signal
Second end.Specifically, the first end of functional module 30 can be connect with the input terminal of hysteresis module 10.The of functional module 30
It two ends can be with the second end and connection of switching module 20.Functional module 30 for example can be the functional chip of fundus camera.
In some instances, the second end of functional module 30 can receive first control signal or second control signal.When
When receiving first control signal, functional module 30 can stop communicating with switching module 20.When receiving second control signal, function
Energy module 30 can be communicated via hysteresis module 10 with switching module 20.Wherein, functional module 30 is stopped with switching module 20
When only communicating, Medical Devices 1 are in charge mode, and when functional module 30 is communicated with switching module 20, Medical Devices 1 are in
Non-charging mode.Wherein, functional module 30 can be the number of functional module 30 Yu switching module 20 with the communication of switching module 20
According to or information transmission.For example, the functional chip of fundus camera can transmit eye fundus image letter to main control chip by USB interface
Breath.In addition, non-charging mode can be one of usb host mode or USB device mode.
In some instances, when functional module 30 receives first control signal, if Medical Devices 1 are in charging mould
Formula, then Medical Devices 1 keep charge mode, if being in non-charging mode, Medical Devices 1 obtain functional module 30 and switching mould
Block 20 stops communication.When functional module 30 receives second control signal, if Medical Devices 1 are in non-charging mode, cure
It treats equipment 1 and keeps non-charging mode, if being in charge mode, Medical Devices 1 obtain functional module 30 and switching module 20 is extensive
Multiple communication.Wherein, under charge mode, external power supply power supply can charge to Medical Devices 1 by hysteresis module 10.Non- charging mould
Under formula, it can be carried out data transmission by the first end of functional module 30 between switching module 20 and functional module 30.
In the prior art, Medical Devices 1 switch on and off the moment of external power supply, and there may be waves by first voltage Vin
It is dynamic.The fluctuation of first voltage Vin can be to be caused by the interference in circuit (circuit of Medical Devices 1 or the circuit of external power supply)
's.For example, external power supply is connect when being charged with Medical Devices 1, voltage is increased, and circuit output state changes, electric current
Also it can change correspondingly, and then driving impedance influences the stability of circuit.In addition, there is likely to be high-frequency noises to interfere in circuit,
The electric current of stray capacitance and some output flow directions ground, can also have an adverse effect to the stability of the voltage output of circuit.Work as electricity
Pressure generates fluctuation, and jump leads to the unstable of 20 pattern switching of switching module back and forth caused by the fluctuation of voltage, in some instances it may even be possible to lead
Cause 1 crash problem of Medical Devices.
In contrast, in the disclosure, hysteresis module 10 can receive first voltage Vin and according to first voltage threshold value
Vth, second voltage threshold value Vtl and first voltage Vin export second voltage Vout.Switching module 20 can be according to second voltage
Vout carries out pattern switching, and generates control signal.Functional module 30 can receive control signal, and be determined based on control signal
Whether communicated with switching module 20.As described above, hysteresis module 10 can steadily export high level or low level,
Therefore, switching module 20 can steadily carry out pattern switching.Thereby, it is possible to make Medical Devices 1 steadily carry out pattern switching,
It solves Medical Devices 1 and switches on and off pattern switching shakiness caused by the moment first voltage Vin fluctuation of external power supply power supply
Determine situation and even results in 1 crash problem of Medical Devices.
(variation 1)
Fig. 4 is to show the schematic diagram of the variation 1 of the hysteresis module in Medical Devices involved in the disclosure.Fig. 5 is
Show the schematic diagram of the output waveform of the variation 1 of the hysteresis module in Medical Devices involved in the disclosure.In this implementation
In mode, hysteresis module 10A can also be positive hysteresis circuitry.
In the present embodiment, hysteresis module 10A and the difference of hysteresis module 10 are, the inverting input terminal of comparator T
Input reference voltage Vref and normal phase input end input first voltage Vin.Specifically, first voltage Vin can pass through input
The normal phase input end of resistance R2 connection comparator T, reference voltage Vref can pass through the anti-phase input of resistance R1 connection comparator T
End.Other element connection types are constant.
In some instances, sluggish as shown in figure 5, when first voltage Vin is greater than or equal to first voltage threshold value Vth
The second voltage Vout of the output end output of comparator T in module 10A is high level Voh.When first voltage Vin is less than or waits
When second voltage threshold value Vtl, the second voltage Vout of the output end output of the comparator T in hysteresis module 10A is low level
Vol.When first voltage Vin is less than first voltage threshold value Vth and is greater than second voltage threshold value Vtl, the comparison of hysteresis module 10A
The second voltage Vout of the output end output of device T keeps previous level.
In some instances, in hysteresis module 10A as shown in Figure 4, when first voltage Vin is greater than or equal to the
When one voltage threshold Vth, the second voltage Vout that hysteresis module 10A is generated is high level Voh, and switching module 20 can receive height
Level Voh, and non-charging mode is switched to charge mode.In addition, switching module 20 can produce based on charge mode
One control signal.When first voltage Vin is less than or equal to second voltage threshold value Vtl, the second voltage of hysteresis module 10A generation
Vout is low level Vol, and switching module 20 can receive low level Vol, and charge mode is switched to non-charging mode.Separately
Outside, switching module 20 can produce the second control signal based on non-charging mode.
(variation 2)
Fig. 6 is to show the schematic diagram of the variation 2 of the detection hysteresis module in Medical Devices involved in the disclosure.?
In present embodiment, hysteresis module 10B can also be reverse phase hysteresis circuitry.
In some instances, as shown in fig. 6, hysteresis module 10B may include the partial pressure electricity of the first divider resistance R3 and second
Hinder R4.First divider resistance R3 and the second divider resistance R4 can divide first voltage Vin according to the ratio of resistance.Cause
This, the voltage value of the inverting input terminal of comparator T can be the voltage value that the second divider resistance R4 is assigned to, i.e. comparator T essence
Upper comparison is voltage value that the second divider resistance R4 is assigned to.Wherein, the first divider resistance R3 and the second divider resistance R4 are seen
When doing an entirety, the input-output wave shape figure of hysteresis module 10B can be as shown in Figure 3.
In some instances, as shown in fig. 6, the first end of the first divider resistance R3 can be with the first end of functional module 30
Connection.The second end of first divider resistance R3 can be defeated with the reverse phase of the first end of the second divider resistance R4 and comparator T respectively
Enter end connection.The second end of second divider resistance R4 can be grounded.
In some instances, as shown in fig. 6, hysteresis module 10B may include input resistance R2, feedback resistance Rf, pull-up
Resistance Rp and comparator T.Comparator T may include normal phase input end, inverting input terminal, positive power source terminal, negative power end and output
End.
In some instances, as shown in fig. 6, the first end of input resistance R2 can be connect with the negative power end of comparator T.
The second end of input resistance R2 can be connect with the normal phase input end of the first end of feedback resistance Rf and comparator T.Feedback resistance
The second end of Rf can be connect with the output end of comparator T.The first end of pull-up resistor Rp can be connect with power supply Vp.Pull-up electricity
The second end of resistance Rp can be connect with the output end of hysteresis module 10B.Pull-up resistor may insure that output end exports high level.
It illustrates, the term " first ", " second ", " third " and similar statement in present embodiment are simultaneously not specific to
Specific sequence.Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the disclosure
The normally understood meaning of the technical staff in domain is identical.
Although above combine drawings and embodiments the disclosure is illustrated, it will be appreciated that on state
It is bright not limit the disclosure in any form.Those skilled in the art are without departing from the connotation and range of the disclosure
It can according to need and the disclosure is deformed and is changed, these deformations and variation are each fallen in the scope of the present disclosure.
Claims (10)
1. a kind of Medical Devices with hysteresis module characterized by comprising
Hysteresis module has the output end of the input terminal for receiving first voltage and output second voltage, the hysteresis module tool
There are a first voltage threshold value and the second voltage threshold value less than the first voltage threshold value, and based on the first voltage, described
First voltage threshold value and the second voltage threshold value, export the second voltage；
Switching module is used to receive the second voltage, carries out charge mode or non-charging mode based on the second voltage
Pattern switching, and export first control signal based on the charge mode or the based on the non-charging mode second control
Signal；And
Functional module has described in the first end connecting via the hysteresis module with the switching module and reception
The second end of first control signal or the second control signal, when the second end receives the first control signal, institute
It states functional module to communicate with switching module stopping, the Medical Devices are in the charge mode, when second termination
When receiving the second control signal, the functional module is communicated via the hysteresis module with the switching module, institute
It states Medical Devices and is in the non-charging mode.
2. Medical Devices according to claim 1, it is characterised in that:
When the first voltage is greater than or equal to the first voltage threshold value, the switching module cuts the non-charging mode
It is changed to the charge mode；
When the first voltage is less than or equal to the second voltage threshold value, the switching module switches the charge mode
For the non-charging mode；
When the first voltage is less than the first voltage threshold value and is greater than the second voltage threshold value, the switching module is protected
Hold present mode.
3. Medical Devices according to claim 1, it is characterised in that:
The hysteresis module is reverse phase hysteresis circuitry.
4. Medical Devices according to claim 1, it is characterised in that:
The hysteresis module is positive hysteresis circuitry.
5. Medical Devices according to claim 3, it is characterised in that:
When the first voltage is greater than or equal to the first voltage threshold value, the second voltage is low level, the switching
Module receives the low level, and the non-charging mode is switched to the charge mode；
When the first voltage is less than or equal to the second voltage threshold value, the second voltage is high level, the switching
Module receives the high level, and the charge mode is switched to the non-charging mode；
When the first voltage is less than the first voltage threshold value and is greater than the second voltage threshold value, the switching module is protected
Hold present mode.
6. Medical Devices according to claim 4, it is characterised in that:
When the first voltage is greater than or equal to the first voltage threshold value, the second voltage is high level, the switching
Module receives the high level, and the non-charging mode is switched to the charge mode；
When the first voltage is less than or equal to the second voltage threshold value, the second voltage is low level, the switching
Module receives the low level, and the charge mode is switched to the non-charging mode；
When the first voltage is less than the first voltage threshold value and is greater than the second voltage threshold value, the switching module is protected
Hold present mode.
7. Medical Devices according to claim 3, it is characterised in that:
The reverse phase hysteresis circuitry includes the first divider resistance, the second divider resistance, input resistance, feedback resistance, pull-up resistor
And comparator, the comparator have normal phase input end, inverting input terminal, positive power source terminal, negative power end and output end；
The first end of first divider resistance is connect with the first end of the functional module, first divider resistance
Second end is connect with the first end of second divider resistance and the inverting input terminal, the second end of second divider resistance
Ground connection；The first end of the input resistance is connect with the negative power end, the second end of the input resistance and feedback electricity
The first end of resistance is connected with the normal phase input end, and the second end of the feedback resistance is connect with the output end of the comparator,
The first end of the pull-up resistor connects to power supply, the second end of the pull-up resistor is connect with the output end of the comparator.
8. Medical Devices according to claim 1 or 2, it is characterised in that:
The Medical Devices are fundus camera.
9. Medical Devices according to claim 8, it is characterised in that:
The non-charging mode is one of usb host mode or USB device mode.
10. Medical Devices according to claim 1 or 2, it is characterised in that:
The hysteresis module is connect by USB interface with the switching module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821682471.5U CN208849505U (en) | 2018-10-17 | 2018-10-17 | Medical Devices with hysteresis module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821682471.5U CN208849505U (en) | 2018-10-17 | 2018-10-17 | Medical Devices with hysteresis module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208849505U true CN208849505U (en) | 2019-05-10 |
Family
ID=66375663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821682471.5U Active CN208849505U (en) | 2018-10-17 | 2018-10-17 | Medical Devices with hysteresis module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208849505U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109394169A (en) * | 2018-10-17 | 2019-03-01 | 深圳硅基智能科技有限公司 | Medical Devices with hysteresis module |
-
2018
- 2018-10-17 CN CN201821682471.5U patent/CN208849505U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109394169A (en) * | 2018-10-17 | 2019-03-01 | 深圳硅基智能科技有限公司 | Medical Devices with hysteresis module |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202797874U (en) | Over-voltage protection circuit and mobile terminal | |
| CN102890666B (en) | A kind of devices and methods therefor of shared interface, communication terminal | |
| US10574073B2 (en) | Electronic device and method for controlling power supply | |
| US20080272741A1 (en) | Systems and methods for detecting power sources | |
| CN111404219A (en) | Method for fast USB charging, electronic device and charger device | |
| CN104239240A (en) | Electronic device with universal serial bus (USB) interface with integration function | |
| CN109804527A (en) | Charger | |
| CN109394169B (en) | Medical Devices with hysteresis module | |
| JP2012213250A (en) | Protection circuit and input/output circuit | |
| CN104600963A (en) | Output voltage dual-mode detection circuit of switching power supply | |
| EP3490100A1 (en) | Charging system, terminal, power adapter and charging line | |
| CN105301386B (en) | OTG detection circuit and mobile terminal with it | |
| CN208849505U (en) | Medical Devices with hysteresis module | |
| CN214375036U (en) | Mobile device test system | |
| CN207075049U (en) | A kind of auto iris drive circuit and electronic installation | |
| CN108599309A (en) | More mouthfuls of USB fast charge circuits | |
| CN102692539B (en) | Tolerance to overvoltage level sensitive circuit, its method of operating and system | |
| CN114077565A (en) | Identification circuit, system control circuit, access circuit and interface device | |
| CN106899061A (en) | Mobile terminal, charging device and charging method | |
| CN207601785U (en) | External electrical connection interface | |
| CN110912239A (en) | Multi-port charging equipment | |
| CN110333878A (en) | A kind of equipment to be brushed, connector and brush machine system | |
| CN103139689A (en) | Device and method for eliminating popping sound of earphone | |
| CN220962413U (en) | Signal identification and transmission circuit and terminal equipment | |
| CN104852412B (en) | A kind of charging current control method and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |