CN113996252A - Activation system for PVC gel activation - Google Patents

Activation system for PVC gel activation Download PDF

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Publication number
CN113996252A
CN113996252A CN202111267113.4A CN202111267113A CN113996252A CN 113996252 A CN113996252 A CN 113996252A CN 202111267113 A CN202111267113 A CN 202111267113A CN 113996252 A CN113996252 A CN 113996252A
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CN
China
Prior art keywords
pwm control
activation
module
switch circuit
pvc gel
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.)
Pending
Application number
CN202111267113.4A
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Chinese (zh)
Inventor
朱子才
董晨源
李涛
李二龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xi'an Aibo Electronic System Co ltd
Xian Jiaotong University
Original Assignee
Xi'an Aibo Electronic System Co ltd
Xian Jiaotong University
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Xi'an Aibo Electronic System Co ltd, Xian Jiaotong University filed Critical Xi'an Aibo Electronic System Co ltd
Priority to CN202111267113.4A priority Critical patent/CN113996252A/en
Publication of CN113996252A publication Critical patent/CN113996252A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
    • B01J13/0052—Preparation of gels
    • B01J13/0065—Preparation of gels containing an organic phase
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08J2327/06—Homopolymers or copolymers of vinyl chloride

Abstract

The invention discloses an activation system for PVC gel activation, which adopts a switch circuit connected with a PWM control module, realizes the conduction of a boosting module for providing high direct current voltage to PVC gel by utilizing the switch of the switch circuit, adopts a power supply for supplying power to the activation circuit, utilizes the PWM control module to work under the power supply of the power supply to generate a series of PWM control signals, the boosting module amplifies the voltage for activating the PVC gel at high voltage, the switch circuit is influenced by the PWM control module to work, when the PWM control signal is at high level, the switch circuit is closed and conducted, when the PWM control signal is at low level, the switch circuit is disconnected and not conducted, realizes the connection and disconnection of a PVC gel activation high-voltage circuit, ensures the adjustability of the current magnitude in different periods, reduces the power and energy loss of the activated PVC gel, reduces the activation time, improves the activation efficiency, and meets the requirements of the activation power of the PVC gel, meanwhile, the WM control module, the boosting module and the switch circuit are adopted, the integration level is high, and miniaturization is facilitated.

Description

Activation system for PVC gel activation
Technical Field
The invention belongs to the technical field of activation of dielectric materials, and particularly relates to an activation system for PVC gel activation.
Background
PVC gel is a novel intelligent material, and compared with drivers such as traditional motors and hydraulic pressure, the driver based on PVC gel has the advantages of light weight, large deformation, no noise, high response speed, low energy consumption, flexible movement and the like, so that the driver is concerned and researched by more and more scholars. In the last two decades, PVC gel is an important direction in the field of bionic materials, is developed rapidly, has a wide development prospect, and especially has an important application value in the fields of electronic wearable equipment, soft robots and the like. In these fields, there are high demands on the volume weight, response speed and efficiency of driving the active power source.
However, the current PVC gel-based actuator has a long activation period before normal operation, requires a large power and has a large volume of activation equipment. The PVC gel activation process shown in fig. 1, shows the charging activation of PVC gel: when the PVC gel is in the activation stage, the initial charging peak current value (Ic) of activation is large, the charging current value in one PWM period is reduced, the charging peak current values in a plurality of periods are reduced, the leakage current value is also reduced, and finally the activation steady state is achieved. At present, in a common activation circuit, the output current needs to reach a charging peak current value (Ic), so that the whole activation power of the circuit is very high, the volume of an instrument used for activation is very large, and the power and energy loss of activated PVC gel are increased.
Disclosure of Invention
The invention aims to provide an activation system for PVC gel activation, which overcomes the defects of the prior art, can improve the integration level of a circuit, reduce the power and energy loss of the activated PVC gel, reduce the activation time and improve the activation efficiency; meanwhile, the requirement of PVC gel activation power is met, and the pressurizing module is ensured not to enter a protection self-locking state.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an activation system for PVC gel is activated, includes PWM control module, pressure boost module, switch circuit and power, and PWM control module is used for producing the switch of on-off signal control switch circuit, and switch circuit receives PWM control module control pressure boost module, and pressure boost module is used for providing high DC voltage for the PVC gel, and the power is used for supplying power for activation circuit.
Furthermore, an overcurrent self-locking protection unit is arranged in the boosting module.
Further, the switch circuit is arranged between the boosting module and the PWM control module, the PWM control module is connected to the switch circuit, and the PVC gel is connected to the boosting module.
Furthermore, the PWM control signal controls the conduction time of the switch circuit to be smaller than the response time of the boost module for reaching the protection current, and the boost module always outputs high voltage when the switch circuit is conducted.
Furthermore, the switch circuit is arranged between the pressurization module and the PVC gel, and the PWM control module is connected to the switch circuit.
Furthermore, the PWM control module adopts current-limiting resistance, current feedback or PWM timing setting to set PWM control signals of the PWM control module.
Furthermore, a current feedback device is arranged between the PWM control module and the boosting module and used for feeding the current of the boosting module back to the PWM control module, when the current feedback device detects that the current is about to reach a protection current, the PWM control module generates a PWM control signal and switches to a zero level.
Furthermore, a timing module is arranged in the PWM control module, and the switching circuit under the control of the PWM control signal is always in an on state by performing timing setting on the PWM control module.
Furthermore, the PWM control module is connected with a current-limiting resistor, the current-limiting resistor is used for limiting the current on the charging branch, and the current feedback can disconnect the switch when the current reaches the self-locking critical current protected by the voltage boosting module, so that the PWM control signal is at zero level.
Furthermore, a front switch circuit is arranged between the PWM control module and the pressurizing module, a rear switch circuit is arranged between the pressurizing module and the PVC gel, and the PWM control module is connected with the rear switch circuit.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to an activation system for PVC gel activation, which adopts a switch circuit connected with a PWM control module, realizes the conduction of a boosting module for providing high direct current voltage to PVC gel by utilizing the switch of the switch circuit, adopts a power supply for supplying power to the activation circuit, utilizes the PWM control module to work under the power supply of the power supply to generate a series of PWM control signals, the boosting module amplifies the voltage for activating the PVC gel at high voltage, the switch circuit is influenced by the PWM control module to work, when the PWM control signal is at high level, the switch circuit is closed and conducted, when the PWM control signal is at low level, the switch circuit is disconnected and not conducted, realizes the connection and disconnection of a PVC gel activation high-voltage circuit, ensures the adjustability of current magnitude in different periods, reduces the power and energy loss of activated PVC gel, reduces the activation time, improves the activation efficiency, and meets the power requirement of PVC gel activation, meanwhile, the WM control module, the boosting module and the switch circuit are adopted, the integration level is high, and miniaturization is facilitated.
Furthermore, an overcurrent self-locking protection unit is arranged in the boosting module, so that the boosting module is prevented from entering a protection self-locking state, and the stability of the circuit is improved.
Furthermore, a current-limiting resistor, a current feedback device or PWM timing setting can be introduced to set a PWM control signal, so that a switching circuit under the control of the PWM control signal is always in a pass state, and the stability of the circuit is ensured.
Drawings
FIG. 1 is a graph of the current time-domain response of PVC gel during activation.
Fig. 2 is a charging voltage/current self-locking protection diagram of the voltage boost module in the embodiment of the invention.
Fig. 3 is a schematic diagram of PWM control signal modulation according to an embodiment of the present invention.
Fig. 4 is a current response diagram under the PWM control signal according to the embodiment of the present invention.
FIG. 5 is a schematic diagram of PVC gel activation under the control of a pre-switch circuit in an embodiment of the present invention.
FIG. 6 is a schematic diagram of PVC gel activation under the control of a post-switch circuit in an embodiment of the present invention.
FIG. 7 is a schematic diagram of PVC gel activation under the control of a post-switch circuit incorporating current feedback in an embodiment of the present invention.
FIG. 8 is a schematic diagram of the activation of PVC gel under the control of the front/back switch circuits in the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 5, an activation system for PVC gel activation includes a PWM control module, a voltage boost module, a switch circuit and a power supply, the PWM control module is used to generate an on-off signal to control the on-off of the switch circuit, the switch circuit is controlled by the PWM control module to start and stop the voltage boost module, the voltage boost module is used to provide high dc voltage for the PVC gel, and the power supply is used to supply power to the activation circuit.
The PVC gel activation needs large current, and needs small current when working normally, an overcurrent self-locking protection unit is arranged in the pressurization module, the adopted pressurization module with the overcurrent self-locking protection unit meets the power of PVC gel activation, and the pressurization module is not damaged by overload; meanwhile, the PWM controlled switch circuit can avoid the starting protection self-locking state of the pressurizing module; adopt WM control module, pressure boost module and switch circuit to make activation circuit miniaturization, improved the integrated level of circuit, reduced the power and the energy loss of activation PVC gel, reduced activation time, improved the efficiency of activation.
The PWM control module uses a series of pulse voltages or pulse currents (PWM control signals) with rapidly varying pulse widths to achieve the activation goal. The PWM control signal may exhibit different control waveforms according to different controller commands.
And controlling a switching circuit at the front end of the pressurizing module, and adopting a current protection measure for on-off PWM control signals generated by the PWM control module, wherein the PWM control signals ensure that the conduction time of the switching circuit is less than the response time of the pressurizing module for reaching the protection current, and the pressurizing module always outputs high voltage when the switching circuit is conducted, so that the PVC gel is activated.
As shown in fig. 7, the PWM control module employs current limiting resistance, current feedback, or PWM timing settings for setting the PWM control signal of the PWM control module.
Specifically, be provided with current feedback device between PWM control module and the pressure boost module for with the current feedback of pressure boost module to PWM control module, detect the electric current at current feedback device and be about to reach the protection current, when the pressure boost module will get into auto-lock protect state promptly, PWM control signal switches to zero level, has avoided the pressure boost module to get into the protection auto-lock state.
A timing module is arranged in the PWM control module, timing setting is carried out on the PWM control module, PWM control frequency is preset through an upper computer, and the switching circuit controlled by the PWM control signal is guaranteed to be in an on-state all the time.
The PWM control module is connected with a current-limiting resistor, and the current-limiting resistor is used for limiting the current on the charging branch circuit; when the current reaches the protection self-locking critical current of the boosting module, the current feedback can disconnect the switch to enable the PWM control signal to be at zero level; the PWM timing setting can control the duty ratio of a PWM control signal; the three protection measures can enable the switch circuit under the control of the PWM control signal to be always in a closed circuit state, and the PVC gel is activated and charged.
The mode of combining and controlling the front switch circuit and the rear switch circuit can be adopted; as shown in fig. 8, a pre-switch circuit is arranged between the PWM control module and the voltage boost module, a post-switch circuit is arranged between the voltage boost module and the PVC gel, and the PWM control module is connected to the post-switch circuit; when the front-end switch circuit works, the rear-end circuit switch is closed; when the rear switch circuit works, the front switch circuit is closed. The PVC gel is activated for the leading switch circuit of during operation is quick, and PVC gel is activated through the control of PWM waveform signal to rearmounted switch circuit, adopts leading switch circuit and rearmounted switch circuit, has reduced PVC gel activated power to original 1/10 ~ 1/6, greatly reduced energy consumption, has reduced the volume of power.
The switching circuit is composed of one or more MOS tubes, or an H-bridge chip can be used for realizing the function, and the MOS tubes can be NMOS or PMOS. The power supply voltage can be 12-36V, and the power supply can be a lead-acid storage battery, a UPS storage battery, a nickel-cadmium battery, a lithium iron phosphate storage battery, a lithium ion polymer battery, a lithium ion battery and the like. The capacity of the battery is 2000 mAh-8000 mAh. The power supply is not welded and fixed with the activation circuit, is connected with the activation circuit only when in use, and is convenient to charge and replace.
The current time domain response graph of the PVC gel when the PWM control signal is activated as shown in FIG. 1 shows the characteristics of PVC gel activation: the initial charging peak current value (Ic) of activation is large, the charging current value in one PWM cycle is reduced, the charging peak current values in a plurality of cycles are reduced, the leakage current value is also reduced, and finally the activation steady state is achieved. In this state, the steady-state peak current reaches Is, and the steady-state leakage current reaches Id.
The PVC gel activation process needs to use large current for charging activation, and the current value needed in the normal working stage is very small.
When the output current of the pressurizing module is too large and exceeds the self-locking protection current of the pressurizing module, the output current value of the pressurizing module is rapidly reduced and enters a protection state. Fig. 2 shows the dynamic variation of the output voltage value of the boost module.
FIG. 3 shows the PWM control signal modulation principle, U0At high level, the signal rises to U from zero level step in one period0After a certain time, the voltage level goes to zero.
Referring to fig. 4, the PVC gel can rapidly respond to Is after the generated current slowly rises for several cycles through the response time under the control of the PWM control signal, and Is reversely discharged when the PWM Is deenergized to a zero level state.
Example 1
This example describes a small fast activation circuit of PVC gel under the control of only a pre-switch circuit.
Referring to fig. 5, when the PVC gel is rapidly activated, only one pre-switch circuit is used for control. The frequency of the PWM control signal is set to be 1Hz through the control of the PWM control signal, the front-end switch circuit can output a series of PWM signals with stable periods, if the voltage boosting module enters a protection self-locking state, one-time charging excitation of PVC gel is completed under the PWM rising edge and high level of the next period, and the PVC gel is rapidly activated under the PWM rising edge and high level excitation of a plurality of periods.
The power of PVC gel activation is reduced to 1/10-1/6, the energy consumption is greatly reduced, the size of a power supply is reduced, and the circuit integration level is improved.
Example 2
This example describes a small fast activation circuit of PVC gel under the control of only a post-switch circuit. Referring to fig. 6, when the PVC gel is rapidly activated, only one post-switch circuit is used for control.
(1) Through the control of the PWM control signal, the post-switch circuit can output a series of cycles less than 2t through the timing setting of the PWM control module1Setting the frequency of the PWM control signal to 5kHz, which signal ensures that the frequency is less than t1Within the time, the current is not saturated, the voltage cannot reach the gain voltage of the boost module, namely the boost module cannot enter a protection self-locking state. At a period less than 2t1Under the excitation of PWM signals, the PVC gel completes the rapid activation.
(2) The current value in the series branch between the PVC gel and the pressurizing module can be reduced by introducing a series current-limiting resistor, and the value is smaller than the self-locking protection current of the pressurizing module, so that the situation that one-time charging excitation in figure 2, namely the state of disconnection and no polarization, occurs is avoided. The starting and stopping of the switching circuit is controlled by the PWM control signal, the frequency of the PWM control signal is set to be 10kHz, and the PVC gel finishes rapid polarization.
(3) As shown in fig. 7, by introducing the current feedback module, when the PWM control signal controls the self-locking protection current of the critical high-voltage module of the current value of the small high-voltage output, the frequency of the PWM control signal is initially set to 5kHz, the current feedback device sets the PWM signal to zero level through the control signal of the PWM control module, switches off the switch circuit, and activates with a higher frequency signal, for example, 10kHz, thereby preventing the small high-voltage module from entering the protection self-locking state due to an excessively large current value.
Example 3
This example describes a small fast activation circuit of PVC gel under the control of a pre-switch circuit and a post-switch circuit. Referring to fig. 8, when the PVC gel is rapidly activated, a pre-switch circuit and a post-switch are used to control the activation.
The embodiment combines two switching circuits, when the front-end switching circuit works, the switch of the rear-end circuit is closed, and when the front-end switching circuit works, the frequency of the PWM control signal is set to be 1 Hz; when the rear switch circuit works, the front switch circuit is closed, and when the rear switch works, the frequency of the PWM control signal is set to be 10 kHz. The pre-switch circuit can output a series of PWM signals with stable period through the control of the PWM control signal, and the quick activation of the PVC gel is completed; the rear-mounted switch circuit can drive the PVC gel by starting and stopping under the condition of low current, namely, the effect of activating and driving two-in-one is achieved.

Claims (10)

1. The utility model provides an activation system for PVC gel activation which characterized in that, includes PWM control module, pressure boost module, switch circuit and power, and PWM control module is used for producing the switch of on-off signal control switch circuit, and switch circuit receives PWM control module control pressure boost module, and pressure boost module is used for providing high DC voltage for the PVC gel, and the power is used for supplying power for activation circuit.
2. The activation system for PVC gel activation according to claim 1, wherein an over-current self-locking protection unit is provided in the pressurizing module.
3. The activation system for PVC gel activation according to claim 1, wherein the switch circuit is disposed between the voltage boost module and the PWM control module, the PWM control module is connected to the switch circuit, and the PVC gel is connected to the voltage boost module.
4. The activation system for PVC gel activation according to claim 3, wherein the PWM control signal controls the switch circuit conduction time to be less than the response time of the voltage boost module to reach the protection current, and the voltage boost module always outputs high voltage when the switch circuit is conducted.
5. The activation system for PVC gel activation according to claim 1, wherein the switch circuit is disposed between the voltage boost module and the PVC gel, and the PWM control module is connected to the switch circuit.
6. The activation system for PVC gel activation according to claim 5, wherein the PWM control module employs current limiting resistance, current feedback or PWM timing settings for setting the PWM control signal of the PWM control module.
7. The activation system for PVC gel activation according to claim 6, wherein a current feedback device is disposed between the PWM control module and the voltage boost module for feeding the current of the voltage boost module back to the PWM control module, and when the current feedback device detects that the current is about to reach the protection current, the PWM control module generates the PWM control signal to switch to a zero level.
8. The activation system for PVC gel activation according to claim 6, wherein a timing module is provided in the PWM control module, and the switching circuit under the control of the PWM control signal is always in an on state by the timing setting in the PWM control module.
9. The activation system for PVC gel activation according to claim 6, wherein the PWM control module is connected to a current limiting resistor for limiting the current on the charging branch, and the current feedback can disconnect the switch when the current reaches the protection self-locking critical current of the voltage boost module, so that the PWM control signal is at zero level.
10. The activation system for PVC gel activation according to claim 1, wherein a pre-switch circuit is arranged between the PWM control module and the voltage boost module, a post-switch circuit is arranged between the voltage boost module and the PVC gel, and the PWM control module is connected with the post-switch circuit.
CN202111267113.4A 2021-10-28 2021-10-28 Activation system for PVC gel activation Pending CN113996252A (en)

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Application Number Priority Date Filing Date Title
CN202111267113.4A CN113996252A (en) 2021-10-28 2021-10-28 Activation system for PVC gel activation

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