CN208709884U - The taibiter of electromyography signal - Google Patents
The taibiter of electromyography signal Download PDFInfo
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- CN208709884U CN208709884U CN201721357982.5U CN201721357982U CN208709884U CN 208709884 U CN208709884 U CN 208709884U CN 201721357982 U CN201721357982 U CN 201721357982U CN 208709884 U CN208709884 U CN 208709884U
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- taibiter
- operational amplifier
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Abstract
The utility model discloses a kind of taibiter of electromyography signal, it include: instrument amplifier, operational amplifier integrating circuit and high-pass filter, instrument amplifier is connected between acquisition signal input part and acquisition signal output end, operational amplifier integrating circuit integrates the input signal of the signal input part transmitted via instrument amplifier and feeds back to instrument amplifier, instrument amplifier handles the signal of feedback and is exported to high-pass filter, and high-pass filter is filtered the signal of output and exports to acquisition signal output end；Operational amplifier integrating circuit is constituted by operational amplifier, the first capacitor in parallel with operational amplifier and with the concatenated first resistor of operational amplifier；Taibiter further includes the second resistance and first switch in parallel with first resistor, and first switch is connected with second resistance.The utility model can greatly reduce the settling time of built-up circuit in electromyographic signal collection circuit by the way that simple control switch is added.
Description
Technical field
The utility model relates to electromyography signal circuits, the in particular to fast quick-recovery electricity of muscle electricity biofeedback instrument electromyography signal
Road.
Background technique
Electromyography signal is the superposition of moving cell action potential over time and space in numerous muscle fibres.In existing flesh
In electric bio-feedback therapeutic apparatus, due to the influence of high-pass filter settling time, electromyographic signal collection and electro photoluminescence output are point
It drives into capable, usually first acquires electromyography signal, after signal reaches certain threshold value, the electricity for starting one fixed duration of output is pierced
Swash sequence.Electromyography signal can only control electro photoluminescence and start, and not can control it terminates.Cause using effect undesirable.
By taking the electro photoluminescence for exporting 20Hz as an example, output gap 50ms will correctly detect electromyography signal in 50ms,
The signal settling time for needing to shorten circuit achievees the effect that electromyography signal real-time control electro photoluminescence exports.But the prior art
In, the passband lowpass frequency of myoelectricity Acquisition Circuit is usually very low, such as when for 10Hz or lower, the signal settling time of circuit
It may be up to several hundred milliseconds even several seconds.Mean after input signal connects on human body, to wait ability after considerable time
Electromyography signal can correctly be collected.Since circuit signal settling time is longer, cause electromyography signal can not real-time control electricity thorn
Swash the effect of output, user experience is poor.
Utility model content
The purpose of this utility model is to provide for a kind of taibiter of electromyography signal, can solve above-mentioned existing skill
One or more of art problem.
One aspect according to the present utility model provides a kind of taibiter of electromyography signal, comprising: instrument is put
Big device, operational amplifier integrating circuit and high-pass filter,
Instrument amplifier is connected between acquisition signal input part and acquisition signal output end, operational amplifier integrating circuit
Instrument amplifier, instrument amplification are integrated and fed back to the input signal of the signal input part transmitted via instrument amplifier
Device handles the signal of feedback and is exported to high-pass filter, and high-pass filter is filtered simultaneously the signal of output
Output extremely acquisition signal output end；
Operational amplifier integrating circuit is put by operational amplifier, the first capacitor in parallel with operational amplifier and with operation
The big concatenated first resistor of device is constituted；
Wherein, the taibiter of the utility model further includes that the second resistance and first in parallel with first resistor is opened
It closes, first switch is connected with second resistance, whether with by the access of the open and close of first switch control second resistance.
In some embodiments, the high-pass filter of the taibiter of the utility model is by the second capacitor and with
The concatenated 3rd resistor of two capacitors is constituted.Wherein, the taibiter of the utility model further includes in parallel with the second capacitor
Second switch, whether the disconnection of second switch and closure control the access of the second capacitor.As a result, after second switch closure, high pass
Filter becomes the bleeder circuit being composed in series by the internal resistance and 3rd resistor of second switch, since the internal resistance of second switch is remote
Less than the resistance value of 3rd resistor, signal directly passes through second switch and all arrives above 3rd resistor, so as to avoid high pass
Filter too long settling time.
In some embodiments, the acquisition signal input part of the taibiter of the utility model includes the first signal
Input terminal and second signal input terminal, wherein the first signal input part and second signal input terminal respectively with third switch and the
Four switch series connections, the open and close of third switch and the 4th switch controls the first signal input part and second signal input
End whether ground short circuit.Thus, it is possible to avoid instrument amplifier that output is vacantly caused to be saturated.
In some embodiments, the first switch, second switch, third switch of the taibiter of the utility model
It is electronic switch or light coupling relay with the 4th switch.Thus, it is possible to by the automatically controlled of switch, it is precisely fast so as to realize
The variation of fast ground control circuit.
In some embodiments, the first switch, second switch, third switch of the taibiter of the utility model
It is connected respectively with processor with the 4th switch, respectively to be switched on-off by processor control.Thus, it is possible to more using processor
Each switch is controlled well.
In some embodiments, the processor of the taibiter of the utility model is inputted with acquisition signal is connected to
The output electro photoluminescence at end is connected, and is respectively switched on-off according to the disconnection of output electro photoluminescence and closure control,
Wherein, when initial, first switch, second switch, third switch and the 4th switch are disconnected；When processor detects
When exporting electro photoluminescence disconnection and the connection of acquisition signal input part, processor control third switch is closed the switch with the 4th, to keep away
Exempting from instrument amplifier vacantly causes output to be saturated；When processor detects that output electro photoluminescence is linked into people for signal input part is acquired
When body, processor controls first switch and the second switch closure, and controls third switch and the 4th switch and disconnect.Thus, it is possible to
According to output electric signal and whether acquiring the connection of signal, it is accurately controlled the open and close of each switch.
In some embodiments, the taibiter of the utility model, the resistance value of second resistance is much smaller than described the
The resistance value of one resistance.When in parallel with first resistor to second resistance, it is equivalent to and greatly reduces total resistance value, so as to
Greatly shorten the settling time of operational amplifier integrating circuit.
The circuit of the taibiter of the electromyography signal of the utility model is simple, at low cost, high reliablity.Pass through addition
Simple control switch can greatly reduce the settling time of built-up circuit in electromyographic signal collection circuit, so as to so that
The effect of electromyography signal real-time control electro photoluminescence output, promotes user experience.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of myoelectricity Acquisition Circuit in the prior art.
Fig. 2 is the structural schematic diagram of the taibiter of the electromyography signal of an embodiment of the present invention.
Fig. 3 is the switch control time sequence figure of an embodiment of the present invention.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
Fig. 1 schematically shows the structure of myoelectricity Acquisition Circuit in the prior art.
As shown in Figure 1, myoelectricity Acquisition Circuit in the prior art, mainly by instrument amplifier U1 (such as: brand: ADI type
Number: AD620) and amplifier U2 and peripheral resistance capacitance composition.Instrument amplifier U1 shares eight pins, as 1 in figure, 2,3,4,5,
Shown in 6,7,8.Wherein, AD620 pin function is as follows: 1. gain setting resistor ends；2. negative signal inputs；3. positive signal
Input；4. negative voltage is powered；5. reference voltage；6. signal exports；7. positive voltage is powered；8. gain setting resistor end.It needs
Bright, AD620 can also be replaced with parameter similar or other higher instrument amplifiers.
U2, R1, C1 constitute a typical operational amplifier integrating circuit, input to IN_P in U1, IN_N input terminal
Electromyography signal is integrated and is fed back to the low reference pin (U1_5) of U1, and it is dry which can effectively eliminate low-frequency ac and direct current etc.
Signal is disturbed, realizes effective amplification to electromyography signal.Circuit parameter is determined by following formula:
C2 and R3 constitutes a passive high three-way filter, can further filter out low frequency and direct current signal.Circuit parameter by
Following formula determines:
Since the settling time of upper two circuits of figure is determined by RC (resistance and capacitor) constant, when myoelectricity Acquisition Circuit
Passable frequency it is very low when, such as when 10Hz or lower, the signal settling time of circuit may be up to several hundred milliseconds even number
Second.Mean after IN_N connects on human body, could correctly collect after waiting considerable time as input signal IN_P
Electromyography signal.Lead to poor user experience, using effect is undesirable.
Fig. 2 schematically shows a kind of knots of the taibiter of the electromyography signal of embodiment of the utility model
Structure.
In this embodiment, in view of the deficiencies in the prior art, following improvement has been made:
1. newly-increased circuit changing switch first switch S1 and second switch S2: when first switch S1 is closed, first resistor R1
It is in parallel with second resistance R2, when second resistance R2 is more much smaller than first resistor R1 resistance value, quite with reduce RC constant value, meeting
Greatly shorten the settling time of integrating circuit；When second switch S2 is closed, the height of the second capacitor C2 and 3rd resistor R3 composition
Bandpass filter circuit becomes the bleeder circuit being composed in series by second switch S2 internal resistance and 3rd resistor R3, due to second switch
The internal resistance of S2 is much smaller than the resistance value of 3rd resistor R3, and signal directly passes through second switch S2 and all arrives above 3rd resistor R3.
Avoid high-pass filtering too long settling time.
2. newly-increased short-circuit switch of input third switch S3 and the 4th switch S4 needs to break when exporting electro photoluminescence
Input signal IN_P and IN_N are opened, in order to avoid instrument amplifier input vacantly causes output to be saturated, is at this time passed through input terminal
Third switch S3, the 4th switch S4 are short-circuited to reference to ground GND.
3. switch S1-S4 control sequential is as shown in Figure 3: timing total duration is 50ms, is always divided into 3 states.In state 1
When, electro photoluminescence is exported, input signal IN_P, IN_N and human body are to disconnect at this time.First switch S1, second switch S2, third
Switch S3, the 4th switch S4 are short-circuit condition, can be saturated to avoid rear class output signal；In state 2, stop output electricity thorn
Swash, starts to restore electromyography signal, first switch S1, second switch S2 short circuit, third switch S3, the 4th switch S4 are disconnected, myoelectricity
Signal can restore in a short time, but can also change the passband of circuit, institute while first switch S1, second switch S2 short circuit
To need to disconnect the two switches before acquiring signal, restore passband；In state 3, start acquire electromyography signal, first
Switch S1, second switch S2, third switch S3, the 4th switch S4 are off-state, can be with since electromyography signal is recovered
Collect correct electromyography signal.
By above-mentioned principle, the acquisition of electromyography signal can be realized within the short time at the interval of output electro photoluminescence.In real time
Control electro photoluminescence output and stopping.
Claims (7)
1. the taibiter of electromyography signal characterized by comprising instrument amplifier, operational amplifier integrating circuit and
High-pass filter,
The instrument amplifier is connected between acquisition signal input part and acquisition signal output end, the operational amplifier integral
Circuit integrates the input signal of the signal input part transmitted via the instrument amplifier and feeds back to the instrument and put
Big device, the instrument amplifier handle the signal of feedback and are exported to the high-pass filter, the high-pass filter
The signal of output is filtered and is exported to the acquisition signal output end；
The operational amplifier integrating circuit by operational amplifier, the first capacitor in parallel with the operational amplifier and with institute
The concatenated first resistor of operational amplifier is stated to constitute；
Wherein, the taibiter further includes the second resistance and first switch in parallel with the first resistor, and described
One switch connect with the second resistance, with by the open and close of the first switch control second resistance access and
It is no.
2. taibiter according to claim 1, which is characterized in that the high-pass filter by the second capacitor and with
The concatenated 3rd resistor of second capacitor is constituted, wherein the taibiter further includes in parallel with second capacitor
Second switch, whether the disconnection of the second switch and closure control the access of second capacitor.
3. taibiter according to claim 2, which is characterized in that the acquisition signal input part includes the first letter
Number input terminal and second signal input terminal, wherein first signal input part and the second signal input terminal are respectively with
Three switches and the 4th with switching series connection, believe by the open and close control described first of the third switch and the 4th switch
Number input terminal and the second signal input terminal whether ground short circuit.
4. taibiter according to claim 3, which is characterized in that the first switch, the second switch, institute
Stating third switch and the 4th switch is electronic switch or light coupling relay.
5. taibiter according to claim 3 or 4, which is characterized in that the first switch, described second open
Pass, third switch and the 4th switch are connected with processor respectively, to control the logical of each switch by the processor
It is disconnected.
6. taibiter according to claim 5, which is characterized in that the processor is believed with the acquisition is connected to
The output electro photoluminescence of number input terminal is connected, and controls and respectively switch on-off according to the disconnection and closure of the output electro photoluminescence,
Wherein, when initial, the first switch, the second switch, third switch and the 4th switch are disconnected；When
When the processor detects that the output electro photoluminescence disconnects the connection with the acquisition signal input part, the processor control
The third switch and the described 4th closes the switch, and vacantly causes output to be saturated to avoid the instrument amplifier；When the place
When reason device detects that the acquisition signal input part is linked into human body by the output electro photoluminescence, the processor control first is opened
It closes and second switch is closed, and control the third switch and the 4th switch and disconnect.
7. taibiter described in any one of -4 according to claim 1, which is characterized in that the resistance value of the second resistance
Much smaller than the resistance value of the first resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721357982.5U CN208709884U (en) | 2017-10-20 | 2017-10-20 | The taibiter of electromyography signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721357982.5U CN208709884U (en) | 2017-10-20 | 2017-10-20 | The taibiter of electromyography signal |
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| CN208709884U true CN208709884U (en) | 2019-04-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110638443A (en) * | 2019-11-07 | 2020-01-03 | 福州大学 | Electrocardiosignal reading circuit |
| CN111839500A (en) * | 2020-07-10 | 2020-10-30 | 中国科学院深圳先进技术研究院 | Fast recovery circuit and fast recovery method |
| CN112564664A (en) * | 2020-12-03 | 2021-03-26 | 成都海光微电子技术有限公司 | Filter circuit, integrated circuit and method for shortening filter response time |
-
2017
- 2017-10-20 CN CN201721357982.5U patent/CN208709884U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110638443A (en) * | 2019-11-07 | 2020-01-03 | 福州大学 | Electrocardiosignal reading circuit |
| CN111839500A (en) * | 2020-07-10 | 2020-10-30 | 中国科学院深圳先进技术研究院 | Fast recovery circuit and fast recovery method |
| CN111839500B (en) * | 2020-07-10 | 2023-01-31 | 中国科学院深圳先进技术研究院 | Fast recovery circuit and fast recovery method |
| CN112564664A (en) * | 2020-12-03 | 2021-03-26 | 成都海光微电子技术有限公司 | Filter circuit, integrated circuit and method for shortening filter response time |
| CN112564664B (en) * | 2020-12-03 | 2024-04-05 | 成都海光微电子技术有限公司 | Filter circuit, integrated circuit and method for shortening filter response time |
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