CN110652302A - Knee vibration measuring instrument - Google Patents
Knee vibration measuring instrument Download PDFInfo
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- CN110652302A CN110652302A CN201910959742.XA CN201910959742A CN110652302A CN 110652302 A CN110652302 A CN 110652302A CN 201910959742 A CN201910959742 A CN 201910959742A CN 110652302 A CN110652302 A CN 110652302A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
- A61B5/1101—Detecting tremor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
- A61B5/112—Gait analysis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6802—Sensor mounted on worn items
- A61B5/6804—Garments; Clothes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0204—Operational features of power management
- A61B2560/0214—Operational features of power management of power generation or supply
Abstract
The invention relates to a knee vibration measuring instrument, which comprises a data acquisition processing module (1) and a patellar sensor module (2), wherein the data acquisition processing module (1) is connected with the patellar sensor module (2); the data acquisition and processing module (1) comprises a self-powered battery module (11), a microcontroller (12), a gyroscope (13), a storage module (14), a reference time module (15) and a data transmission module (16). The knee vibration measuring instrument adopts the self-powered battery module, the self-powered battery module can convert external energy into electric energy in the using process of the measuring instrument so as to charge the measuring instrument, an external power supply is not needed to charge, the electric energy is saved, the working time of the battery is prolonged, and the knee vibration measuring instrument can be worn and carried for a long time.
Description
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to a knee vibration measuring instrument.
Background
The human knee joint pathological changes are formed by the friction of articular cartilage, and the types and the degrees of the knee joint cartilage pathological changes can be judged through the vibration test of patella of the knee. The knee vibration measuring instrument is novel intelligent wearable equipment for testing and recording the vibration, noise and real-time posture of the knee of a human body in the pathological diagnosis process of the knee. The existing knee vibration measuring instrument can realize the integrated test of knee vibration and noise, and can monitor the postures of the knees and the shanks of a human body in real time.
The appearance of the knee vibration measuring instrument is similar to that of a knee pad, and a small and light signal acquisition device is required. The integrated real-time vibration signal of record and gesture signal of miniature acceleration sensor and gyroscope collection in signal acquisition equipment to can upload simple signal characteristic to the high in the clouds, look over through cloud platform system or cell-phone APP mode.
The miniaturized and lightweight features of the knee vibration measuring instrument make the measuring instrument convenient for a user to wear and carry. However, wearing and carrying for a long time easily causes the battery of the measuring instrument to be exhausted, so that the measuring instrument cannot work normally.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a knee vibration measuring instrument. The technical problem to be solved by the invention is realized by the following technical scheme:
the embodiment of the invention provides a knee vibration measuring instrument, which comprises: a data acquisition processing module and a patellar sensor module, wherein,
the data acquisition processing module is connected with the patella sensor module;
the data acquisition and processing module comprises a self-powered battery module, a microcontroller, a gyroscope, a storage module, a reference time module and a data transmission module, wherein,
the self-powered battery module is connected with the microcontroller, the gyroscope, the storage module, the reference time module, the data transmission module and the patellar sensor module, and is used for acquiring and converting external energy and providing driving current for the microcontroller, the gyroscope, the storage module, the reference time module, the data transmission module and the patellar sensor module;
the microcontroller is connected with the gyroscope, the storage module, the reference time module, the data transmission module and the patellar sensor module and is used for receiving and processing vibration data at the patella of the knee, muscle posture data at the thigh and posture data at the calf, wherein the vibration data at the patella of the knee and the muscle posture data at the thigh are acquired and transmitted by the patellar sensor module (2), and the posture data at the calf is acquired by the gyroscope (13);
the storage module is used for storing the vibration data of the patella of the knee, the muscle posture data of the thigh and the posture data of the shank;
the data transmission module is used for transmitting characteristic value data in the data processed by the microcontroller;
the reference time module is used for providing a time reference for the microcontroller.
In one embodiment of the present invention, a self-powered battery module comprises a power module and a power system coupled to the power module, wherein the power system comprises a piezoelectric interface circuit, a thermoelectric interface circuit, a voltage control module, and a first capacitor C1, wherein,
the piezoelectric interface circuit is connected between the piezoelectric sensor and the voltage control module and used for converting a first alternating current output signal transmitted by the piezoelectric sensor into electric energy, and the first alternating current output signal is formed by converting vibration energy of the surrounding environment by the piezoelectric sensor;
the thermoelectric interface circuit is connected between the thermoelectric sensor and the voltage control module and used for converting a second alternating current output signal output by the thermoelectric sensor into electric energy, and the second alternating current output signal is formed by converting surrounding thermal energy by the thermoelectric sensor;
the voltage control module is connected to the power supply module, and is used for receiving and controlling the voltages generated by the piezoelectric interface circuit and the thermoelectric interface circuit and outputting a stable voltage to the power supply module;
the first capacitor C1 is connected between the output terminal of the voltage control module and ground.
In one embodiment of the invention, the piezoelectric interface circuit comprises a negative voltage converter unit and an active diode unit, which are connected in sequence, wherein,
the negative voltage converter unit and the active diode unit are used for rectifying the first alternating current output signal into a direct current signal and transmitting the direct current signal to the voltage control module.
In one embodiment of the present invention, the negative voltage converter unit includes a first NMOS transistor N1, a second NMOS transistor N2, a third NMOS transistor N3, a fourth NMOS transistor N4, a first PMOS transistor P1, and a second PMOS transistor P2, wherein,
the source electrode of the first NMOS transistor N1 and the gate electrode of the second NMOS transistor N2 are both connected to a first input terminal Vin1, the source electrode of the second NMOS transistor N2 and the gate electrode of the first NMOS transistor N1 are connected to a second input terminal Vin2, the drain electrode and the substrate of the first NMOS transistor N1 and the drain electrode and the substrate of the second NMOS transistor N2 are both connected to the ground terminal;
the source electrode of the first PMOS tube P1 and the gate electrode of the second PMOS tube P2 are both connected to a first input end Vin1, the source electrode of the second PMOS tube P2 and the gate electrode of the first PMOS tube P1 are both connected to a second input end Vin2, the substrate of the first PMOS tube P1 is connected to the substrate of the second PMOS tube P2, and the drain electrode of the first PMOS tube P1 and the drain electrode of the second PMOS tube P2 are both connected to a voltage output end Vnvc;
the drain and the gate of the third NMOS transistor N3 are connected to the voltage output terminal Vnvc, the substrate thereof is connected to the ground terminal, and the source thereof is connected to the substrate of the second PMOS transistor P2;
the source electrode and the substrate of the fourth NMOS transistor N4 are connected with the ground terminal, and the drain electrode and the gate electrode of the fourth NMOS transistor N3578 are connected with the source electrode of the third NMOS transistor N3;
the first input terminal Vin1 and the second input terminal Vin2 are both connected to the output terminal of the piezoelectric sensor.
In one embodiment of the present invention, the active diode unit includes a fifth NMOS transistor N5, a sixth NMOS transistor N6, a seventh NMOS transistor N7, an eighth NMOS transistor N8, a ninth NMOS transistor N9, a tenth NMOS transistor N10, a third PMOS transistor P3, a fourth PMOS transistor P4, a fifth PMOS transistor P5, a sixth PMOS transistor P6, a seventh PMOS transistor P7, an eighth PMOS transistor P8, a ninth PMOS transistor P9, a tenth PMOS transistor P10, an eleventh PMOS transistor P11, a twelfth PMOS transistor P12, a thirteenth PMOS transistor P13, wherein,
the source electrode and the substrate of the fifth NMOS transistor N5, the source electrode and the substrate of the sixth NMOS transistor N6, the source electrode and the substrate of the seventh NMOS transistor N7, the source electrode and the substrate of the eighth NMOS transistor N8, the source electrode and the substrate of the ninth NMOS transistor N9, and the source electrode and the substrate of the tenth NMOS transistor N10 are all connected to a ground terminal;
the grid electrode and the drain electrode of the fifth NMOS tube N5 are both connected with the drain electrode of the seventh PMOS tube P7, the gate and the drain of the sixth NMOS transistor N6 are both connected to the drain of the ninth PMOS transistor P9, the gate of the seventh NMOS transistor N7 is connected to the gate of the sixth NMOS transistor N6, the drain electrode of the seventh NMOS transistor N7 is connected to the drain electrode of the tenth PMOS transistor P10, the gate of the eighth NMOS transistor N8 is connected to the drain of the seventh NMOS transistor N7 and the gate of the eleventh PMOS transistor P11, the drain electrode of the eighth NMOS transistor N8 is connected to the drain electrode of the eleventh PMOS transistor P11, the gate of the ninth NMOS transistor N9 is connected to the drain of the eighth NMOS transistor N8 and the gate of the twelfth PMOS transistor P12, the drain electrode of the ninth NMOS transistor N9 is connected to the drain electrode of the twelfth PMOS transistor P12, the gate of the tenth NMOS transistor N10 is connected to the drain of the ninth NMOS transistor N9 and the gate of the thirteenth PMOS transistor P13, the drain electrode of the tenth NMOS transistor N10 is connected to the drain electrode of the thirteenth PMOS transistor P13;
a source and a substrate of the seventh PMOS transistor P7, a source and a substrate of the eighth PMOS transistor P8, and a substrate of the ninth PMOS transistor P9 are all connected to the negative voltage converter unit, a gate of the seventh PMOS transistor P7 and a gate of the eighth PMOS transistor P8 are all connected to a drain of the seventh PMOS transistor P7, a drain of the eighth PMOS transistor P8 is connected to a source of the ninth PMOS transistor P9, a gate of the ninth PMOS transistor P9 and a gate of the tenth PMOS transistor P10 are both connected to a ground terminal, and a source of the tenth PMOS transistor P10 is connected to a drain of the eighth PMOS transistor P8;
the substrate of the tenth PMOS transistor P10, the source electrode and the substrate of the eleventh PMOS transistor P11, the source electrode and the substrate of the twelfth PMOS transistor P12, and the source electrode and the substrate of the thirteenth PMOS transistor P13 are all connected to the voltage control module;
the grid electrode of the sixth PMOS tube P6 is connected to the drain electrode of the thirteenth PMOS tube P13, the source electrode of the sixth PMOS tube P6 is connected to the negative voltage converter unit, and the drain electrode of the sixth PMOS tube P6 is connected to the voltage control module;
the source electrode of the third PMOS tube P3, the gate electrode of the fifth PMOS tube P5 and the source electrode of the fourth PMOS tube P4 are all connected to the negative voltage converter unit;
the grid electrode and the drain electrode of the third PMOS tube P3, the grid electrode of the fourth PMOS tube P4 and the source electrode of the fifth PMOS tube P5 are all connected to the voltage control module;
the substrate of the third PMOS transistor P3, the substrate and the drain of the fourth PMOS transistor P4, and the substrate and the drain of the fifth PMOS transistor P5 are all connected to the substrate of the sixth PMOS transistor P6.
In one embodiment of the present invention, the thermoelectric interface circuit includes an activation circuit, a mechanical switch S, a storage circuit, a second capacitor C2, and a third capacitor C3, wherein,
the input end of the starting circuit and the input end of the storage circuit are both connected with the output end of the thermoelectric sensor, the output end of the starting circuit is connected with the input end of the storage circuit, the starting circuit is used for receiving and boosting the second alternating current output signal, judging whether the boosted voltage value reaches the standard of supplying power to the storage circuit or not, and supplying power supply voltage to the storage circuit to start the storage circuit to store the second alternating current output signal;
the output end of the storage circuit is connected with the input end of the voltage control module, and the storage circuit is used for storing the power supply voltage provided by the thermoelectric sensor and providing voltage for the voltage control module;
the mechanical switch S is connected between the starting circuit and a grounding end and is used for controlling the working mode of the thermoelectric interface circuit according to the condition that the piezoelectric interface circuit obtains energy;
the second capacitor C2 is connected between the output end of the starting circuit and the ground end;
the third capacitor C3 is connected between the output terminal of the memory circuit and ground.
In one embodiment of the present invention, the start-up circuit includes a first resistor R1, an inductor L, a fourteenth PMOS transistor P14, an eleventh NMOS transistor N11, a reference voltage source VREF1, a second resistor R2, a third resistor R3, a fourth capacitor C4, and a comparator Comp, wherein,
a first end of the first resistor R1 is used as an input end of the pyroelectric sensor, a second end of the first resistor R1 is connected to a first end of the inductor L, and a second end of the inductor L is connected to a source electrode of the fourteenth PMOS transistor P14;
the gate of the fourteenth PMOS tube P14 is connected to the drain thereof, and the drain of the fourteenth PMOS tube P14 is connected to the input terminal of the memory circuit, the input terminal of the reference voltage source VREF1 and the first terminal of the second resistor R2; the second capacitor C2 is connected between the drain of the fourteenth PMOS transistor P14 and the ground terminal;
the output end of the reference voltage source VREF1 is connected to the inverting input end of the comparator Comp;
the second end of the second resistor R2 is connected to the first end of the third resistor R3 and the non-inverting input of the comparator Comp;
the fourth capacitor C4 is connected between the first end and the second end of the third resistor R3 in a bridging mode;
the non-inverting output end of the comparator Comp is connected with the gate of the eleventh NMOS transistor N11;
a source of the eleventh NMOS transistor N11 is connected to a ground terminal, and a drain of the eleventh NMOS transistor N11 is connected to the second end of the inductor L, one end of the mechanical switch S, and a source of the fourteenth PMOS transistor P14.
In one embodiment of the invention, the start-up circuit further comprises an oscillator CLK,
the input end of the oscillator CLK is connected to the source of the fourteenth PMOS transistor P14, and the output end of the oscillator CLK is connected to the non-inverting input end of the comparator Comp.
In one embodiment of the present invention, the voltage control module includes a reference voltage source VERF2, a charging control module, a fifteenth PMOS transistor P15, an error amplifier H1, a fourth resistor R4, and a fifth resistor R5, wherein,
an input end of the reference voltage source VERF2, a source electrode of the fifteenth PMOS transistor P15, and a first input end of the charging control module are commonly connected to a node a, and the node a is connected to an output end of the piezoelectric interface circuit and an output end of the thermoelectric interface circuit;
the output end of the reference voltage source VERF2 is connected with the inverting input end of the error amplifier H1;
the substrate of the fifteenth PMOS tube P15 is connected with the source electrode thereof, and the drain electrode of the fifteenth PMOS tube P15 is used as the output end of the voltage control module;
a first output end of the charging control module is connected with a grid electrode of the fifteenth PMOS pipe P15, and a second output end of the charging control module is connected with an output end of the power supply system;
the non-inverting input end of the error amplifier H1 is connected between the fifth resistor R5 and the fourth resistor R4, and the output end of the error amplifier H1 is connected with the second input end of the charge control circuit 11231;
the fifth resistor R5 and the fourth resistor R4 are connected in series between the drain of the fifteenth PMOS transistor P15 and the ground terminal.
Compared with the prior art, the invention has the beneficial effects that:
the knee vibration measuring instrument provided by the invention adopts the self-powered battery module, the self-powered battery module can convert external energy into electric energy in the using process of the measuring instrument so as to charge the measuring instrument, an external power supply is not required for charging, the electric energy is saved, the working time of the battery is prolonged, and the knee vibration measuring instrument can be worn and carried for a long time.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of a knee vibration measuring instrument according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a self-powered battery module according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a power supply system according to an embodiment of the present invention;
fig. 4 is a block diagram of a piezoelectric interface circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a negative voltage converter unit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of an active diode unit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an equivalent circuit of the active diode cell of FIG. 6;
FIG. 8 is a block circuit diagram of a thermal interface circuit according to an embodiment of the present invention;
fig. 9 is a schematic circuit structure diagram of a starting circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example one
Referring to fig. 1, fig. 1 is a schematic structural diagram of a knee vibration measuring instrument according to an embodiment of the present invention. The knee vibration measuring instrument in fig. 1 includes a data acquisition and processing module 1 and a patellar sensor module 2. Wherein, the data acquisition processing module 1 is connected with the patella sensor module 2.
The patella sensor module 2 mainly completes acquisition and transmission of vibration data of patella of human knee and muscle posture data of thigh, and comprises sensors (including two digital three-axis accelerometers 21 and 22, 1 digital gyroscope 23 and 1 digital microphone 24), a power circuit 25 and a microcontroller 26. The microcontroller 26 is connected to the digital triaxial accelerometer 21, the digital triaxial accelerometer 22, the digital gyroscope 23 and the digital microphone 24, and the power supply circuit 25 is connected to the two digital triaxial accelerometers 21, the digital triaxial accelerometer 22, the digital gyroscope 23, the digital microphone 24 and the microcontroller 26.
The data acquisition and processing module 1 comprises a self-powered battery module 11, a microcontroller 12, a gyroscope 13, a storage module 14, a reference time module 15 and a data transmission module 16.
The self-powered battery module 11 is connected with the microcontroller 12, the gyroscope 13, the storage module 14, the reference time module 15, the data transmission module 16 and the power circuit 25 in the patella sensor module 2, and is used for acquiring and converting external energy and providing driving current for the microcontroller 12, the gyroscope 13, the storage module 14, the reference time module 15, the data transmission module 16 and the power circuit 25 in the patella sensor module 2; the microcontroller 12 is connected with the gyroscope 13, the storage module 14, the reference time module 15, the data transmission module 16 and the microcontroller 26 in the patellar sensor module 2, and is used for receiving the vibration data of the patella of the knee and the muscle posture data of the thigh transmitted by the microcontroller 26 in the patellar sensor module 2 and the posture data of the calf acquired by the gyroscope 13, and processing the vibration data of the patella of the knee, the muscle posture data of the thigh and the posture data of the calf; the storage module 14 is used for storing the vibration data at the patella of the knee, the muscle posture data at the thigh and the posture data at the calf; the data transmission module 16 is used for transmitting characteristic value data in the data processed by the microcontroller 12; the reference time module 15 is used to provide a time reference to the microcontroller 12.
The battery module of this embodiment is the self-powered battery module 11, and the self-powered battery module 11 obtains and converts energy of the surrounding environment, such as vibration energy and thermal energy, into electric energy, so that the measuring instrument can be self-charged in the using process without using an external power supply, thereby not only saving electric energy, but also prolonging the working time of the battery, and enabling the knee vibration measuring instrument to be worn and carried for a long time.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a self-powered battery module according to an embodiment of the invention. The self-powered battery module 11 includes a power module 111 and a power supply system 112 connected to the power module 111, where the power module 111 is a rechargeable power supply, and the power supply system 112 supplies power to the power module 111.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a power supply system according to an embodiment of the present invention. The power supply system 112 includes a piezoelectric interface circuit 1121, a thermoelectric interface circuit 1122, a voltage control module 1123, and a first capacitor C1.
The piezoelectric interface circuit 1121 is connected between the piezoelectric sensor and the voltage control module 1123. Piezoelectric sensors are generally equivalent to a model of a sinusoidal current source, a parasitic capacitance that degrades energy harvesting efficiency, and a parasitic resistance that is large and generally negligible. The piezoelectric sensor is used for converting vibration energy of the surrounding environment into a first alternating current output signal; the piezoelectric interface circuit 1121 converts the first ac output signal transmitted by the piezoelectric sensor into electrical energy. Thermoelectric interface circuit 1122 is connected between a thermoelectric sensor that converts ambient thermal energy (e.g., temperature difference) into a second ac output signal and voltage control module 1123, and thermoelectric interface circuit 1122 converts the second ac output signal output by the thermoelectric sensor into electrical energy. The output end of the voltage control module 1123 is connected to the power module 111, and is configured to receive and control the voltages generated by the piezoelectric interface circuit 1121 and the thermoelectric interface circuit 1122, and output a stable voltage to the power module 111. The first capacitor C1 is connected between the output terminal of the voltage control module 1123 and ground.
In this embodiment, the self-powered battery module 11 can convert the vibration energy and/or the thermal energy of the surrounding environment into electric energy through the piezoelectric interface circuit and/or the thermoelectric interface circuit, and two power supply circuits are used to ensure the stability of the self-powered battery module, thereby ensuring the stability of the measuring instrument.
The voltage control module 1123 comprises a reference voltage source VERF2, a charging control module 11231, a fifteenth PMOS transistor P15, an error amplifier H1, a fourth resistor R4 and a fifth resistor R5, wherein an input end of the reference voltage source VERF2, a source electrode of the fifteenth PMOS transistor P15 and a first input end of the charging control module 11231 are commonly connected to a node a, and the node a is connected with an output end of the piezoelectric interface circuit and an output end of the thermoelectric interface circuit; the output end of the reference voltage source VERF2 is connected with the inverting input end of the error amplifier H1; the substrate of the fifteenth PMOS tube P15 is connected with the source electrode thereof, and the drain electrode of the fifteenth PMOS tube P15 is used as the output end of the voltage control module 1123; a first output end of the charging control module 11231 is connected to the gate of the fifteenth PMOS transistor P15, and a second output end of the charging control module 11231 is connected to the output end of the power supply system 112; the non-inverting input end of the error amplifier H1 is connected between the fifth resistor R5 and the fourth resistor R4, and the output end of the error amplifier H1 is connected with the second input end of the charge control circuit 11231; the fifth resistor R5 and the fourth resistor R4 are connected in series between the drain of the fifteenth PMOS transistor P15 and the ground.
In the voltage control module 1123, the reference voltage source VERF2 is used to generate a reference voltage Vref; the error amplifier H1 amplifies the output voltage VOUT by a times to obtain a VOUT, and then obtains the difference value of the a VOUT and the Vref; a fifteenth PMOS tube P15 is a switch tube; the charging control module 11231 is a logic circuit for controlling the on-time of the fifteenth PMOS transistor P15 according to the output value of the error amplifier H1, so as to control the magnitude of the output voltage VOUT.
Example two
On the basis of the first embodiment, please refer to fig. 4, and fig. 4 is a block diagram of a piezoelectric interface circuit according to an embodiment of the present invention. The piezoelectric interface circuit 1121 realizes conversion of vibration energy into a low-precision direct current source, and includes a negative voltage converter unit 11211 and an active diode unit 11212 which are connected in sequence. The input end of the negative voltage converter unit 11211 is connected to the output end of the piezoelectric sensor, the output end of the active diode unit 11212 is connected to the input end of the voltage control module 1123, and the negative voltage converter unit 11211 and the active diode unit 11212 are configured to rectify a first ac output signal, i.e., a sinusoidal signal, into a dc signal and transmit the dc signal to the voltage control module 1123.
Referring to fig. 5, fig. 5 is a schematic circuit structure diagram of a negative voltage converter unit according to an embodiment of the present invention. The negative voltage converter unit 11211 comprises a first NMOS transistor N1, a second NMOS transistor N2, a third NMOS transistor N3, a fourth NMOS transistor N4, a first PMOS transistor P1 and a second PMOS transistor P2.
In this embodiment, the piezoelectric sensor has two output terminals Vin1, Vin2, the source of the first NMOS transistor N1 and the gate of the second NMOS transistor N2 are both connected to the first input terminal Vin1, the source of the second NMOS transistor N2 and the gate of the first NMOS transistor N1 are both connected to the second input terminal Vin2, and the drain of the first NMOS transistor N1 and the substrate, and the drain of the second NMOS transistor N2 and the substrate are both connected to the ground; the source electrode of the first PMOS tube P1 and the grid electrode of the second PMOS tube P2 are both connected to the first input end Vin1, the source electrode of the second PMOS tube P2 and the grid electrode of the first PMOS tube P1 are connected to the second input end Vin2, the substrate of the first PMOS tube P1 is connected to the substrate of the second PMOS tube P2, and the drain electrode of the first PMOS tube P1 and the drain electrode of the second PMOS tube P2 are both connected to the voltage output end Vnvc; the drain and the gate of the third NMOS transistor N3 are connected to the voltage output terminal Vnvc, the substrate thereof is connected to the ground terminal, and the source thereof is connected to the substrate of the second PMOS transistor P2; the source electrode and the substrate of the fourth NMOS transistor N4 are connected with the ground terminal, and the drain electrode and the grid electrode of the fourth NMOS transistor N3578 are connected with the source electrode of the third NMOS transistor N3; the first input terminal Vin1 and the second input terminal Vin2 are both connected to the output terminal of the piezoelectric sensor.
The negative voltage converter unit 11211 converts the negative component of the signal into the positive component, and the MOS transistor connected to the diode is used to replace the conventional diode, so that a smaller conduction voltage drop can be obtained, and the power consumption of the negative voltage converter unit can be reduced.
Referring to fig. 6, fig. 6 is a schematic circuit structure diagram of an active diode unit according to an embodiment of the present invention. The active diode unit 11212 includes a fifth NMOS transistor N5, a sixth NMOS transistor N6, a seventh NMOS transistor N7, an eighth NMOS transistor N8, a ninth NMOS transistor N9, a tenth NMOS transistor N10, a third PMOS transistor P3, a fourth PMOS transistor P4, a fifth PMOS transistor P5, a sixth PMOS transistor P6, a seventh PMOS transistor P7, an eighth PMOS transistor P8, a ninth PMOS transistor P9, a tenth PMOS transistor P10, an eleventh PMOS transistor P11, a twelfth PMOS transistor P12, and a thirteenth PMOS transistor P13.
The source and the substrate of a fifth NMOS transistor N5, the source and the substrate of a sixth NMOS transistor N6, the source and the substrate of a seventh NMOS transistor N7, the source and the substrate of an eighth NMOS transistor N8, the source and the substrate of a ninth NMOS transistor N9, and the source and the substrate of a tenth NMOS transistor N10 are all connected to a ground terminal GND; the grid and the drain of a fifth NMOS transistor N5 are both connected with the drain of a seventh PMOS transistor P7, the grid and the drain of a sixth NMOS transistor N6 are both connected with the drain of a ninth PMOS transistor P9, the grid of a seventh NMOS transistor N7 is connected with the grid of a sixth NMOS transistor N6, the drain of a seventh NMOS transistor N7 is connected with the drain of a tenth PMOS transistor P10, the grid of an eighth NMOS transistor N8 is connected with the drain of a seventh NMOS transistor N7 and the grid of an eleventh PMOS transistor P11, the drain of an eighth NMOS transistor N8 is connected with the drain of an eleventh PMOS transistor P11, the grid of a ninth NMOS transistor N9 is connected with the drain of an eighth NMOS transistor N8 and the grid of a twelfth PMOS transistor P12, the drain of a ninth NMOS transistor N9 is connected with the drain of a twelfth PMOS transistor P12, the grid of a tenth NMOS transistor N10 is connected with the drain of a ninth NMOS transistor N9 and the drain of a thirteenth PMOS P13, and the drain of a thirteenth NMOS 10 is connected with the drain of the thirteenth PMOS transistor P13; a source and a substrate of a seventh PMOS transistor P7, a source and a substrate of an eighth PMOS transistor P8, a substrate of a ninth PMOS transistor P9 are all connected to the negative voltage converter unit 11212, a gate of the seventh PMOS transistor P7 and a gate of the eighth PMOS transistor P8 are all connected to a drain of the seventh PMOS transistor P7, a drain of the eighth PMOS transistor P8 is connected to a source of the ninth PMOS transistor P9, a gate of the ninth PMOS transistor P9 and a gate of the tenth PMOS transistor P10 are both connected to a ground terminal, and a source of the tenth PMOS transistor P10 is connected to a drain of the eighth PMOS transistor P8; the substrate of the tenth PMOS transistor P10, the source and the substrate of the eleventh PMOS transistor P11, the source and the substrate of the twelfth PMOS transistor P12, and the source and the substrate of the thirteenth PMOS transistor P13 are all connected to the voltage control module 1123; a gate of the sixth PMOS transistor P6 is connected to a drain of the thirteenth PMOS transistor P13, a source of the sixth PMOS transistor P6 is connected to the negative voltage converter unit 11212, and a drain of the sixth PMOS transistor P6 is connected to the voltage control module 1123; the source electrode of the third PMOS transistor P3, the gate electrode of the fifth PMOS transistor P5, and the source electrode of the fourth PMOS transistor P4 are all connected to the negative voltage converter unit 11212; the gate and the drain of the third PMOS transistor P3, the gate of the fourth PMOS transistor P4, and the source of the fifth PMOS transistor P5 are all connected to the voltage control module 1123; the substrate of the third PMOS transistor P3, the substrate and the drain of the fourth PMOS transistor P4, and the substrate and the drain of the fifth PMOS transistor P5 are all connected to the substrate of the sixth PMOS transistor P6.
Referring to fig. 7, fig. 7 is an equivalent circuit diagram of the active diode unit in fig. 6, which can be regarded as a substrate conditioning circuit based on PMOS switch transistors. In fig. 6, PMOS transistors P3, P4, P5, and P6 together form a PMOS switch transistor in fig. 7, and NMOS transistors N1 to N10, PMOS transistors P1 to P2, and PMOS transistors P7 to P13 form a comparator part in fig. 7. A point a in fig. 7 is connected to the output terminal of the negative voltage converter unit 11211, and a point b is connected to the output terminal of the voltage control module 1123.
The active diode unit 11212 in fig. 6 and 7 described above functions as a switch, and the comparator section compares the voltage at the point a, which is the previous stage circuit, with the voltage at the point b, which is the load; when the voltage of the front-stage circuit is greater than the load voltage, the PMOS switching tube is conducted to charge the load; when the load voltage is larger than the voltage of the preceding stage circuit, the PMOS switching tube is turned off. With this design, the conduction voltage drop of the active diode unit 11212 is almost zero, approaching the ideal switch.
The conduction voltage drops of the negative voltage converter unit 11211 and the active diode unit 11212 of the present embodiment are very low, which ensures the charging voltage of the piezoelectric sensor circuit to the power module 111 and improves the charging efficiency.
EXAMPLE III
On the basis of the first embodiment and the second embodiment, please refer to fig. 8, and fig. 8 is a circuit block diagram of a thermal interface circuit according to an embodiment of the present invention. The thermoelectric interface circuit 1122 includes a start circuit 11221, a mechanical switch S, a storage circuit 11222, a second capacitor C2, and a third capacitor C3.
In this embodiment, the pyroelectric sensor can be equivalent to a voltage source with internal resistance, which has an output terminal Vin 3. The input end of the starting circuit 11221 and the input end of the storage circuit 11222 are both connected with the output end Vin3 of the pyroelectric sensor, the output end of the starting circuit 11221 is connected with the input end of the storage circuit 11222, the starting circuit 11221 is used for receiving the second alternating current output signal Vin3, boosting the second alternating current output signal Vin3, judging whether the boosted voltage value reaches the standard of supplying power to the storage circuit 11222 and supplying power supply voltage to the storage circuit 11222, and therefore the storage circuit 11222 is started to store the second alternating current output signal; the output end of the storage circuit 11222 is connected to the input end of the voltage control module 1123, and the storage circuit 11222 is used for storing the power supply voltage provided by the pyroelectric sensor and providing the voltage Vout for the voltage control module 1123.
The mechanical switch S is connected between the start circuit 11221 and the ground, and is configured to control the operating mode of the thermoelectric interface circuit 1122 according to the condition that the piezoelectric interface circuit 1121 obtains energy; specifically, mechanical switch S is used to control the turning on of the operating mode of thermoelectric interface circuit 1122: in the event that the piezoelectric interface circuit 1121 is drawing insufficient energy or is otherwise interrupted, the thermoelectric interface circuit 1122 may be activated by a mechanical switch S. In this embodiment, the thermoelectric interface circuit 1122 may be enabled according to the working condition of the piezoelectric interface circuit 1121, so as to provide sufficient guarantee for the charging in the self-charging mode, thereby ensuring the capacitance of the power module 111, fully prolonging the service life of the battery, and prolonging the working time of the power module 111.
The second capacitor C2 is connected between the output terminal of the start-up circuit 11221 and ground; the third capacitor C3 is connected between the output terminal of the memory circuit 11222 and ground. The second capacitor C2 and the third capacitor C3 are both used for storing charges, wherein the third capacitor C3 is a super capacitor.
Referring to fig. 9, fig. 9 is a schematic circuit structure diagram of a start-up circuit according to an embodiment of the invention. In this embodiment, the start circuit 11221 includes a first resistor R1, an inductor L, a fourteenth PMOS transistor P14, an eleventh NMOS transistor N11, a reference voltage source VREF1, a second resistor R2, a third resistor R3, a fourth capacitor C4, an oscillator CLK, and a comparator Comp. The pyroelectric sensor is understood to be the first resistor R1.
A first end of the first resistor R1 is used as an input end of the pyroelectric sensor, a second end of the first resistor R1 is used as an output end of the pyroelectric sensor and is connected with a first end of the inductor L, and a second end of the inductor L is connected with a source electrode of the fourteenth PMOS transistor P14; the gate of the fourteenth PMOS transistor P14 is connected to the drain thereof, and the drain of the fourteenth PMOS transistor P14 is connected to the input terminal of the memory circuit 11222, the input terminal of the reference voltage source VREF1 and the first terminal of the second resistor R2; the second capacitor C2 is connected between the drain of the fourteenth PMOS transistor P14 and the ground terminal; the output end of the reference voltage source VREF1 is connected to the inverting input end of the comparator Comp; the second end of the second resistor R2 is connected to the first end of the third resistor R3 and the non-inverting input terminal of the comparator Comp; the fourth capacitor C4 is connected between the first end and the second end of the third resistor R3 in a bridge mode; the non-inverting output end of the comparator Comp is connected with the gate of the eleventh NMOS transistor N11; the input end of the oscillator CLK is connected to the source of the fourteenth PMOS transistor P14, and the output end of the oscillator CLK is connected to the non-inverting input end of the comparator Comp; the source of the eleventh NMOS transistor N11 is connected to the ground, and the drain of the eleventh NMOS transistor N11 is connected to the second end of the inductor L, one end of the mechanical switch S, and the source of the fourteenth PMOS transistor P14.
The output voltage VDD1 of the start-up circuit 11221 may be expressed as:wherein R is the equivalent internal resistance of the thermoelectric sensor, the thermoelectric acquisition source, RSWIs the equivalent resistance of the fourteenth PMOS transistor P14. Through the formula (1), it can be found that the required supply voltage VDD1 can be obtained by reasonably designing the size of the resistor capacitor; the generated VDD1 is used to start an oscillator CLK for generating a corresponding clock signal and a reference voltage source VREF1, the reference voltage source VREF1 is used to generate a reference voltage, and VDD1 is used to achieve a self-powered effect. The comparator Comp is a dynamic comparator, and is used for detecting the input signal Vin3, and when the VDD1 obtained by the input signal Vin3 is lower than the required starting voltage, the EN1 controls the obtaining system to obtain the thermoelectric energy again.
In the start-up circuit, when the mechanical switch S is turned on, the thermoelectric interface circuit 1122 draws thermal energy in the form of current through the inductor L; when the mechanical switch S is turned off, the inductor L current forces the fourteenth PMOS transistor P14 to be turned on, so as to charge the first capacitor C1, and finally obtain the voltage VDD 1.
Further, the circuit structure of the memory circuit 11222 is the same as that of the start circuit 11221, and is not described herein again.
In the start-up circuit 11221 and the memory circuit 11222, the oscillator CLK is used to provide a clock signal to the comparator Comp, so that the comparator Comp can perform dynamic comparison, and compared with a general comparator, the dynamic comparator has lower power consumption, so that the charging efficiency of the thermoelectric interface circuit is higher.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (9)
1. A knee vibration measuring instrument, comprising: a data acquisition processing module (1) and a patellar sensor module (2), wherein,
the data acquisition processing module (1) is connected with the patellar sensor module (2);
the data acquisition and processing module (1) comprises a self-powered battery module (11), a microcontroller (12), a gyroscope (13), a storage module (14), a reference time module (15) and a data transmission module (16),
the self-powered battery module (11) is connected with the microcontroller (12), the gyroscope (13), the storage module (14), the reference time module (15), the data transmission module (16) and the patellar sensor module (2) and is used for acquiring and converting external energy and providing driving current for the microcontroller (12), the gyroscope (13), the storage module (14), the reference time module (15), the data transmission module (16) and the patellar sensor module (2);
the microcontroller (12) is connected with the gyroscope (13), the storage module (14), the reference time module (15), the data transmission module (16) and the patellar sensor module (2), and the microcontroller (12) is used for receiving and processing vibration data at the patella of the knee, muscle posture data at the thigh and posture data at the calf, wherein the vibration data at the patella of the knee and the muscle posture data at the thigh are acquired and transmitted by the patellar sensor module (2), and the posture data at the calf is acquired by the gyroscope (13);
the storage module (14) is used for storing the vibration data at the patella of the knee, the muscle posture data at the thigh and the posture data at the calf;
the data transmission module (16) is used for transmitting characteristic value data in the data processed by the microcontroller (12);
the reference time module (15) is used for providing a time reference to the microcontroller (12).
2. A knee vibration measuring instrument according to claim 1, wherein the self-powered battery module (11) comprises a power supply module (111) and a power supply system (112) connected to the power supply module (111), wherein the power supply system (112) comprises a piezoelectric interface circuit (1121), a thermoelectric interface circuit (1122), a voltage control module (1123) and a first capacitor (C1), wherein,
the piezoelectric interface circuit (1121) is connected between a piezoelectric sensor and the voltage control module (1123) and is used for converting a first alternating current output signal transmitted by the piezoelectric sensor into electric energy, and the first alternating current output signal is formed by converting vibration energy of the surrounding environment by the piezoelectric sensor;
the thermoelectric interface circuit (1122) is connected between a thermoelectric sensor and the voltage control module (1123) and is used for converting a second alternating current output signal output by the thermoelectric sensor into electric energy, and the second alternating current output signal is formed by converting surrounding heat energy by the thermoelectric sensor;
the voltage control module (1123) is connected to the power module (111) and is used for receiving and controlling the voltage generated by the piezoelectric interface circuit (1121) and the thermoelectric interface circuit (1122) and outputting a stable voltage to the power module (111);
the first capacitor (C1) is connected between the output terminal of the voltage control module (1123) and ground.
3. A knee vibration measuring instrument according to claim 2, wherein the piezoelectric interface circuit (1121) includes a negative voltage converter unit (11211) and an active diode unit (11212) connected in this order, wherein,
the negative voltage converter unit (11211) and the active diode unit (11212) are configured to rectify the first ac output signal into a dc signal and to transmit the dc signal to the voltage control module (1123).
4. A knee vibration measuring instrument according to claim 3, wherein the negative pressure converter unit (11211) includes a first NMOS transistor (N1), a second NMOS transistor (N2), a third NMOS transistor (N3), a fourth NMOS transistor (N4), a first PMOS transistor (P1), and a second PMOS transistor (P2),
the source electrode of the first NMOS transistor (N1) and the gate electrode of the second NMOS transistor (N2) are both connected to a first input end (Vin1), the source electrode of the second NMOS transistor (N2) and the gate electrode of the first NMOS transistor (N1) are connected to a second input end (Vin2), the drain electrode and the substrate of the first NMOS transistor (N1) and the drain electrode and the substrate of the second NMOS transistor (N2) are both connected to the ground end;
the source electrode of the first PMOS tube (P1) and the gate electrode of the second PMOS tube (P2) are both connected to a first input end (Vin1), the source electrode of the second PMOS tube (P2) and the gate electrode of the first PMOS tube (P1) are connected to a second input end (Vin2), the substrate of the first PMOS tube (P1) is connected with the substrate of the second PMOS tube (P2), and the drain electrode of the first PMOS tube (P1) and the drain electrode of the second PMOS tube (P2) are both connected with a voltage output end (Vnvc);
the drain and the gate of the third NMOS transistor (N3) are connected with the voltage output end (Vnvc), the substrate of the third NMOS transistor is connected with the ground end, and the source of the third NMOS transistor is connected with the substrate of the second PMOS transistor (P2);
the source electrode and the substrate of the fourth NMOS tube (N4) are connected with the ground end, and the drain electrode and the gate electrode of the fourth NMOS tube (N3) are connected with the source electrode of the third NMOS tube;
the first input (Vin1) and the second input (Vin2) are both connected to an output of the piezoelectric sensor.
5. A knee vibration measuring instrument according to claim 3, wherein the active diode unit (11212) includes a fifth NMOS transistor (N5), a sixth NMOS transistor (N6), a seventh NMOS transistor (N7), an eighth NMOS transistor (N8), a ninth NMOS transistor (N9), a tenth NMOS transistor (N10), a third PMOS transistor (P3), a fourth PMOS transistor (P4), a fifth PMOS transistor (P5), a sixth PMOS transistor (P6), a seventh PMOS transistor (P7), an eighth PMOS transistor (P8), a ninth PMOS transistor (P9), a tenth PMOS transistor (P10), an eleventh PMOS transistor (P11), a twelfth PMOS transistor (P12), a thirteenth PMOS transistor (P13), wherein,
the source electrode and the substrate of the fifth NMOS transistor (N5), the source electrode and the substrate of the sixth NMOS transistor (N6), the source electrode and the substrate of the seventh NMOS transistor (N7), the source electrode and the substrate of the eighth NMOS transistor (N8), the source electrode and the substrate of the ninth NMOS transistor (N9), and the source electrode and the substrate of the tenth NMOS transistor (N10) are all connected to the ground terminal;
a gate and a drain of the fifth NMOS transistor (N5) are both connected to a drain of the seventh PMOS transistor (P7), a gate and a drain of the sixth NMOS transistor (N6) are both connected to a drain of the ninth PMOS transistor (P9), a gate of the seventh NMOS transistor (N7) is connected to a gate of the sixth NMOS transistor (N6), a drain of the seventh NMOS transistor (N7) is connected to a drain of the tenth PMOS transistor (P10), a gate of the eighth NMOS transistor (N8) is connected to a drain of the seventh NMOS transistor (N7) and a gate of the eleventh PMOS transistor (P11), a drain of the eighth NMOS transistor (N8) is connected to a drain of the eleventh PMOS transistor (P11), a gate of the ninth NMOS transistor (N9) is connected to a drain of the eighth NMOS transistor (N8) and a drain of the twelfth PMOS transistor (P12), a gate of the ninth NMOS transistor (N356) is connected to a drain of the ninth PMOS transistor (N3527), and a drain of the twelfth PMOS transistor (N10) is connected to a drain of the twelfth PMOS transistor (N3527) P13), the drain of the tenth NMOS transistor (N10) is connected to the drain of the thirteenth PMOS transistor (P13);
a source and a substrate of the seventh PMOS transistor (P7), a source and a substrate of the eighth PMOS transistor (P8), and a substrate of the ninth PMOS transistor (P9) are all connected to the negative voltage converter unit (11211), a gate of the seventh PMOS transistor (P7) and a gate of the eighth PMOS transistor (P8) are all connected to a drain of the seventh PMOS transistor (P7), a drain of the eighth PMOS transistor (P8) is connected to a source of the ninth PMOS transistor (P9), a gate of the ninth PMOS transistor (P9) and a gate of the tenth PMOS transistor (P10) are all connected to a ground terminal, and a source of the tenth PMOS transistor (P10) is connected to a drain of the eighth PMOS transistor (P8);
the substrate of the tenth PMOS tube (P10), the source electrode and the substrate of the eleventh PMOS tube (P11), the source electrode and the substrate of the twelfth PMOS tube (P12) and the source electrode and the substrate of the thirteenth PMOS tube (P13) are all connected to the voltage control module (1123);
the grid electrode of the sixth PMOS tube (P6) is connected to the drain electrode of the thirteenth PMOS tube (P13), the source electrode of the sixth PMOS tube (P6) is connected with the negative voltage converter unit (11211), and the drain electrode of the sixth PMOS tube (P6) is connected with the voltage control module (1123);
the source electrode of the third PMOS tube (P3), the grid electrode of the fifth PMOS tube (P5) and the source electrode of the fourth PMOS tube (P4) are all connected to the negative pressure converter unit (11211);
the grid electrode and the drain electrode of the third PMOS tube (P3), the grid electrode of the fourth PMOS tube (P4) and the source electrode of the fifth PMOS tube (P5) are all connected to the voltage control module (1123);
the substrate of the third PMOS tube (P3), the substrate and the drain of the fourth PMOS tube (P4), and the substrate and the drain of the fifth PMOS tube (P5) are all connected to the substrate of the sixth PMOS tube (P6).
6. A knee vibration measuring instrument according to claim 2, wherein the thermoelectric interface circuit (1122) includes an activation circuit (11221), a mechanical switch (S), a storage circuit (11222), a second capacitor (C2), and a third capacitor (C3), wherein,
the input end of the starting circuit (11221) and the input end of the storage circuit (11222) are both connected with the output end of the pyroelectric sensor, the output end of the starting circuit (11221) is connected with the input end of the storage circuit (11222), the starting circuit (11221) is used for receiving and boosting the second alternating current output signal, judging whether the boosted voltage value reaches the standard of supplying power to the storage circuit (11222) or not, and supplying power supply voltage to the storage circuit (11222) to start the storage circuit (11222) to store the second alternating current output signal;
the output end of the storage circuit (11222) is connected with the input end of the voltage control module (1123), and the storage circuit (11222) is used for storing the power supply voltage provided by the thermoelectric sensor and providing voltage for the voltage control module (1123);
the mechanical switch (S) is connected between the starting circuit (11221) and the ground terminal and is used for controlling the working mode of the thermoelectric interface circuit (1122) according to the condition that the piezoelectric interface circuit (1121) obtains energy;
the second capacitor (C2) is connected between the output terminal of the start-up circuit (11221) and ground;
the third capacitor (C3) is connected between the output terminal of the memory circuit (11222) and ground.
7. A knee vibration measuring instrument according to claim 6, wherein the start circuit (11221) includes a first resistor (R1), an inductor (L), a fourteenth PMOS tube (P14), an eleventh NMOS tube (N11), a reference voltage source (VREF1), a second resistor (R2), a third resistor (R3), a fourth capacitor (C4), and a comparator (Comp), wherein,
a first end of the first resistor (R1) is used as an input end of the pyroelectric sensor, a second end of the first resistor (R1) is connected with a first end of the inductor (L), and a second end of the inductor (L) is connected with a source electrode of the fourteenth PMOS tube (P14);
the gate of the fourteenth PMOS tube (P14) is connected with the drain thereof, and the drain of the fourteenth PMOS tube (P14) is connected with the input end of the memory circuit (11222), the input end of the reference voltage source (VREF1) and the first end of the second resistor (R2);
the second capacitor (C2) is connected between the drain of the fourteenth PMOS tube (P14) and the ground terminal;
the output end of the reference voltage source (VREF1) is connected with the inverting input end of the comparator (Comp);
a second terminal of the second resistor (R2) is connected to a first terminal of the third resistor (R3) and to a non-inverting input of the comparator (Comp);
the fourth capacitor (C4) is connected between the first end and the second end of the third resistor (R3) in a bridging mode;
the non-inverting output end of the comparator (Comp) is connected with the grid of the eleventh NMOS tube (N11);
the source electrode of the eleventh NMOS transistor (N11) is connected with the ground terminal, and the drain electrode of the eleventh NMOS transistor (N11) is connected with the second end of the inductor (L), one end of the mechanical switch (S) and the source electrode of the fourteenth PMOS transistor (P14).
8. A knee vibration measuring instrument according to claim 7, wherein the start circuit (11221) further includes an oscillator (CLK), wherein,
the input end of the oscillator (CLK) is connected with the source electrode of the fourteenth PMOS tube (P14), and the output end of the oscillator (CLK) is connected with the non-inverting input end of the comparator (Comp).
9. A knee vibration measuring instrument according to claim 2, wherein the voltage control module (1123) includes a reference voltage source (VERF2), a charging control module (11231), a fifteenth PMOS tube (P15), an error amplifier (H1), a fourth resistor (R4), a fifth resistor (R5), wherein,
an input terminal of the reference voltage source (VERF2), a source electrode of the fifteenth PMOS transistor (P15), and a first input terminal of the charging control module (11231) are commonly connected to a node (a) connecting an output terminal of the piezoelectric interface circuit and an output terminal of the thermoelectric interface circuit;
the output end of the reference voltage source (VERF2) is connected with the inverting input end of the error amplifier (H1);
the substrate of the fifteenth PMOS tube (P15) is connected with the source electrode thereof, and the drain electrode of the fifteenth PMOS tube (P15) is used as the output end of the voltage control module (1123);
a first output end of the charging control module (11231) is connected with the grid electrode of the fifteenth PMOS tube (P15), and a second output end of the charging control module (11231) is connected with the output end of the power supply system (112);
the non-inverting input end of the error amplifier (H1) is connected between the fifth resistor (R5) and the fourth resistor (R4), and the output end of the error amplifier (H1) is connected with the second input end of the charging control circuit (11231);
the fifth resistor (R5) and the fourth resistor (R4) are connected in series between the drain of the fifteenth PMOS tube (P15) and the ground terminal.
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| CN104320124A (en) * | 2014-10-15 | 2015-01-28 | 西安交通大学 | Self-powered interface circuit for thermoelectric energy collection |
| CN204833032U (en) * | 2015-01-21 | 2015-12-02 | 北京华强智连微电子有限责任公司 | Electric capacity LDO circuit in transient response reinforcing matrix |
| CN105897012A (en) * | 2016-05-12 | 2016-08-24 | 西安电子科技大学 | Double-period conversion circuit for energy acquisition |
| CN106100293A (en) * | 2016-08-24 | 2016-11-09 | 西安电子科技大学 | It is applied to current detection circuit and the piezoelectric rectifier of piezoelectric rectifier |
| CN110248601A (en) * | 2016-12-21 | 2019-09-17 | 埃尔瓦有限公司 | Body kinematics or situation are monitored according to motion scheme using conformal electronic device |
| CN107085448A (en) * | 2017-06-26 | 2017-08-22 | 中国电子科技集团公司第五十八研究所 | Low pressure difference linear voltage regulator LDO circuit comprising overcurrent protection |
| CN108365603A (en) * | 2018-03-08 | 2018-08-03 | 中国科学院微电子研究所 | Energy collecting system for acquiring vibrational energy and thermal energy simultaneously |
| CN108900113A (en) * | 2018-06-19 | 2018-11-27 | 大连理工大学 | A kind of synchronous charge-extraction of efficiently self-powered piezoelectricity and voltage reverse circuit |
| CN109171657A (en) * | 2018-09-27 | 2019-01-11 | 无锡研测技术有限公司 | Kneecap health status real-time perception and diagnostic system |
| CN110227251A (en) * | 2019-07-17 | 2019-09-13 | 重庆邮电大学 | It is a kind of can self energizing multifunctional intellectual protector |
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