CN112104196B - Double-closed-loop high-voltage power supply voltage regulating method based on purified current monitoring - Google Patents

Double-closed-loop high-voltage power supply voltage regulating method based on purified current monitoring Download PDF

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CN112104196B
CN112104196B CN202010973263.6A CN202010973263A CN112104196B CN 112104196 B CN112104196 B CN 112104196B CN 202010973263 A CN202010973263 A CN 202010973263A CN 112104196 B CN112104196 B CN 112104196B
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CN112104196A (en
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缪仙荣
姜爱华
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Changxing Youbang Electric Appliances Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention provides a voltage regulating method of a double closed-loop high-voltage power supply based on purified current monitoring, which is characterized by comprising the following steps of: s1, boosting the pressure of the main loop; s1, constant voltage closed-loop control, wherein the constant voltage closed-loop control comprises a voltage detection module, a conventional constant voltage module and an addition circuit; and S1, under-flow compensation closed-loop control, wherein the under-flow compensation closed-loop control comprises an output current detection unit and a setting compensation unit, when a current signal detected by the output current detection unit is lower than a threshold value set value of the setting compensation unit, the setting compensation unit judges and controls to be conducted to the addition circuit, otherwise, the setting compensation unit is disconnected. The voltage output by the under-current compensation closed-loop control and the constant-voltage closed-loop control is utilized to compensate the voltage of the output voltage, so that the high-voltage current is automatically enhanced, the output current of the high-voltage power supply is improved, the normal purification effect is maintained, the cleaning period of the purifier is prolonged, and the operation and maintenance cost is reduced.

Description

Double-closed-loop high-voltage power supply voltage regulating method based on purified current monitoring
Technical Field
The invention relates to the technical field of purifier driving power supplies, in particular to a double-closed-loop high-voltage power supply voltage regulating method based on purification current monitoring.
Background
Along with the forward development of social and economic levels, the requirements of people on the living environment of the people are increasingly improved, in recent years, the continuous air pollution events greatly promote the demands and understanding of the public on air purifiers, most of the existing air purifiers are provided with high-voltage power supplies, particularly purifiers for treating more oil smoke have high requirements on the high-voltage power supplies. The first generation of purified power supply adopts LLC resonant non-constant voltage technology. The second generation of purified power supply adopts closed loop constant voltage technology.
The LLC resonant non-constant voltage technology is characterized in that the closer the oscillation frequency of a power supply circuit is to a resonance point, the higher the output voltage is, and the more the oscillation frequency deviates from the resonance point, the lower the output voltage is; the closed-loop constant voltage technology is that the output voltage is dynamically adjusted to be constant through a closed-loop circuit of sampling, operation, feedback and frequency adjustment, and the output high voltage is not influenced by inductance and capacitance parameters of a load and is not influenced by high-voltage output current.
The LLC resonant non-constant voltage power supply has the following disadvantages: because the working frequency of the circuit is influenced by the load, different loads or different working periods, the output high-voltage and high-voltage current are different, and the lower the current is, the higher the high voltage is. The corona discharge of the new equipment is strong, and the output high voltage is normal. Along with the oil stain enrichment, the discharge capacity is weakened, the current is gradually reduced, the output high voltage is gradually increased until the output high voltage is out of control and exceeds a safety range, so that breakdown discharge and frequent sparking are caused, the damage and the failure of the insulator are greatly increased, and the phenomenon is called 'voltage climbing' in the industry. In particular, once the power supply is unloaded, the resonance voltage far higher than the safety range is generated, and the high-voltage power supply is easily damaged. The resonant non-constant voltage power supply is a main reason of high failure rate and high operation and maintenance cost, and is also a pain point of purification equipment manufacturers and users.
By adopting the closed-loop constant voltage technology, the advantages of low switching loss and high working efficiency can be kept, and the defects of poor safety, high failure rate and high operation and maintenance cost of the resonant non-constant voltage power supply are eliminated. The voltage can be kept stable even if the load is open-circuited, the high-voltage power supply cannot be damaged, the failure rate and the operation and maintenance cost can be greatly reduced, and the method is the most advanced new technology in the environment-friendly purification industry at present. The closed-loop constant voltage technology has the advantages of obvious safety, economy and reliability, promotes the upgrading of the environmental protection purification industry, and the prior generation of resonant non-constant voltage power supply is in the situation of being rapidly eliminated by the closed-loop constant voltage power supply, so that the closed-loop constant voltage power supply becomes mainstream application.
However, although the advantages are obvious, the closed-loop constant-voltage technology still has the defects that: due to the closed-loop constant voltage scheme, the output high voltage of the power supply remains unchanged regardless of changes in the load current. Even if the load is open-circuited, no high-voltage current is output, and the high voltage is still kept unchanged. Therefore, the newly installed purifier device has strong corona discharge capability, large high-voltage output current and ideal purification effect due to large curvature of the tip; along with purification operating time increases, the pointed end of clarifier electric field is lived by absorbent greasy dirt parcel, and the pointed end becomes the button head, and the camber diminishes, then corona discharge ability reduces, and high-voltage output current just reduces correspondingly. Since the high pressure is unchanged, the output power is correspondingly reduced, so that the purification efficiency is reduced, and the purification is hardly carried out in serious cases.
Therefore, it is an urgent technical problem to know the root cause affecting the purification rate of the purifier and how to further enhance the purification rate of the purifier.
Disclosure of Invention
Aiming at the problems, the inventor applies the principles of Newton mechanics and electromagnetism to find out the fundamental reason influencing the purification rate by analyzing the transverse displacement d of oil drop particles through an adsorption area and by utilizing the undercurrent compensation closed-loop control to match with the voltage output by the constant-voltage closed-loop control, the output current of a high-voltage power supply is increased, the main factor of working current is grasped, the working current is kept in an effective range, the purification rate can be kept stable and reliable, when the working current is reduced due to the increase of the oil stain enrichment degree, the compensation measures are adopted to enable the working current to be increased back to the effective range, the purification rate is kept stable in the original set range, the cleaning period is prolonged, the operation and maintenance cost is reduced, and the social and economic benefits are improved.
In order to achieve the purpose, the invention provides the following technical scheme:
a voltage regulation method of a double closed-loop high-voltage power supply based on purified current monitoring is characterized by comprising the following steps:
s1, a main loop boost circuit, which includes a power supply device for providing power, an oscillating circuit electrically connected to the power supply device and performing reverse processing on current, a power regulating module electrically connected to the rear end of the oscillating circuit, a driving circuit electrically connected to the power regulating module and performing power amplification processing on pulse signals, and a high voltage output circuit disposed at the output end of the driving circuit, and which provides high voltage power to a load device;
s2, a constant voltage closed-loop control including a voltage detection module detecting a voltage value of the high voltage output circuit, a conventional constant voltage module comparing the voltage value and providing voltage compensation, and an adding circuit provided between the conventional constant voltage module and the power adjusting module, the adding circuit compensating a voltage input to the power adjusting module;
and S3, performing undercurrent compensation closed-loop control, wherein the undercurrent compensation closed-loop control comprises an output current detection unit electrically connected with the high-voltage output circuit and a setting compensation unit used for controlling voltage compensation of the power regulation module, the setting compensation unit is electrically connected between the output current detection unit and the addition circuit, the output current detection unit detects a current signal value of the high-voltage output circuit and inputs the current signal value to the setting compensation unit, and when the current signal detected by the output current detection unit is lower than a threshold set value of the setting compensation unit, the setting compensation unit judges and controls to be conducted to the addition circuit, otherwise, the setting compensation unit is disconnected.
As an improvement, the rated voltage U of the clean electric field is set to be 12.5 kV-13.5 kV, the rated current I corresponding to the rated voltage U is 11 mA-13 mA, and the threshold value set value of the setting compensation unit is 0.6I-0.8I.
As an improvement, the threshold set value of the setting compensation unit is 0.7I, if the output current detection unit detects that the current signal value reaches 0.7I for the first time, the setting compensation unit provides compensation voltage for the addition circuit, the rated voltage U of the electric field is controlled to increase to U plus delta U, and the delta U is set to be 0.5-1.5 kV; and if the output current detection unit detects that the current signal value reaches 0.7I for the second time, the setting compensation unit sends out a cleaning indication, wherein I is the rated current.
As an improvement, the method also comprises the step of determining the transverse displacement d of oil drop particles through an adsorption area according to the working current Ip, and specifically expressing the calculation formula obtained by Newton mechanics and electromagnetism as follows:
Figure BDA0002684855440000031
wherein U isLVRepresenting the voltage of an adsorption area of a purification electric field, wherein q is the charge of oil drop particles and is calculated by the working current Ip (Ip is q/t), m is the mass of the oil drop particles, L is the length of an adsorption polar plate, D is the distance between the adsorption polar plates, and V is the wind speed; the larger the d is, the more oil drop particles are captured by the positive plate, and the higher the purification rate is; conversely, the smaller d is, the more oil drop particles escape from the adsorption area is, and the lower the purification rate is; and
the purification rate G is estimated from the lateral displacement d, and is specifically expressed as:
Figure BDA0002684855440000032
wherein Y is the ratio of the adsorption area to the air volume.
Meanwhile, the above formula shows that: under the conditions of unchanged oil drop particle mass, long adsorption polar plates, and unchanged adsorption polar plate distance and wind speed, the purification rate is in direct proportion to the charge of the oil drop particles, namely in direct proportion to high-voltage current. So the main factors influencing the purification rate G are the operating current Ip and the adsorption zone voltage ULVNot an electrostatic charging voltage UHV. And the factors influencing the current include the electrostatic loading voltage UHVThe shape and size of the material of the discharge electrode, the climatic conditions (temperature, humidity and air pressure) and the degree of oil enrichment. Electrostatic loading voltage UHVAs well as the shape and size of the material of the discharge electrode, the climatic conditions and the degree of oil enrichment, are secondary factors that influence the transverse displacement d.
As an improvement, the setting compensation unit is adjusted by an operational amplification circuit, the setting compensation unit comprises a bias amplification group and an electronic switch group which are electrically connected, the bias amplification group determines a voltage compensation value, and the electronic switch group controls the output on-off of the voltage compensation value of the bias amplification group.
As an improvement, the setting compensation unit further includes an operational amplifier U1B, a threshold setting group and a cleaning signal group, the operational amplifier U1B is electrically connected to the bias amplification group and the electronic switch group respectively, the threshold setting group is electrically connected to the bias amplification group, the electronic switch group and the cleaning signal group respectively, the bias amplification group determines a voltage compensation value, the electronic switch group controls the output on-off of the bias amplification group, and the cleaning signal group determines a current signal value and controls the emission of a cleaning indication signal.
As an improvement, the bias amplification group comprises an operational amplifier U1D and a first peripheral element, the first peripheral element is matched with the operational amplifier U1D to form a reverse bias amplification circuit, the electronic switch group comprises an operational amplifier U1A and a second peripheral element, the operational amplifier U1A receives a sampling current signal, and the second peripheral element controls the compensation voltage of the bias amplification group to be switched on or switched off.
As an improvement, the setting compensation unit is controlled by sampling calculation of a single chip microcomputer MCU and comprises a first analog-to-digital conversion part, a CPU calculation element, a threshold value adjustment part, a control signal part and a state indicator part, wherein the CPU calculation element is respectively and electrically connected with the first analog-to-digital conversion part, the threshold value adjustment part, the control signal part and the state indicator part, the first analog-to-digital conversion part inputs a converted electric signal to the CPU calculation element, the threshold value adjustment part adjusts an action threshold value of the CPU calculation element, the control signal part determines a voltage compensation value and outputs the voltage compensation value, and the state indicator part indicates a state signal.
As an improvement, the mode of setting the compensation voltage of the compensation unit adopts inverse proportion self-adaptive boosting.
As an improvement, the mode of setting the compensation voltage of the compensation unit adopts constant voltage value step boosting. The invention has the beneficial effects that:
(1) according to the invention, the under-current compensation closed-loop control is matched with the constant-voltage closed-loop control to control the output voltage, so that the output current of the high-voltage power supply is increased, the main factor of the working current is grasped, the working current is kept in an effective range, the stability and the reliability of the purification rate can be kept, when the working current is reduced due to the increase of the oil stain enrichment degree, the compensation measures are adopted to ensure that the working current is increased back to the effective range, the purification rate is kept stable in the original set range, meanwhile, the cleaning period is prolonged, the operation and maintenance cost is reduced, and the social and economic benefits are improved;
(2) the preset threshold is adjusted by the setting compensation unit, so that the compensation starting time can be controlled conveniently according to the actual use condition, and the compensation starting threshold can be adjusted on the premise of ensuring the purification effect;
(3) according to the invention, the voltage compensation value is set by using the setting compensation unit, so that the high-voltage breakdown caused by the fact that the voltage value of the high-voltage output circuit exceeds the normal working high voltage is prevented, and the purification effect is lost;
(4) according to the invention, the automatic control compensation of the setting compensation unit is used for controlling the on or off of the compensation, so that the purifier is automatically switched to a constant-pressure control state after being cleaned, and manual reset is not needed.
In conclusion, the self-adaptive constant-voltage purification power supply has the advantages of self-adaption high-efficiency voltage regulation, flexible threshold setting, stable voltage compensation and the like, overcomes the defect of insufficient purification effect of the conventional constant-voltage purification power supply due to reduction of high-voltage current, and is particularly suitable for the technical field of purifier driving power supplies.
Drawings
FIG. 1 is an overall schematic view of the present invention;
FIG. 2 is a schematic diagram of the lateral displacement of the electrostatic clamping zone;
FIG. 3 is a schematic diagram of the adsorption operation of the purifier;
FIG. 4 is a schematic diagram of the inverse proportional boost of the present invention;
FIG. 5 is a schematic diagram of an operational amplifier circuit of the setting compensation unit according to the present invention;
FIG. 6 is a schematic diagram of a second embodiment of the present invention;
FIG. 7 is a second schematic diagram of a second embodiment of the present invention;
FIG. 8 is a schematic view of a third embodiment of the present invention;
fig. 9 is a schematic view of a fourth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example 1:
as shown in fig. 1 to 5, a voltage regulation method for a dual closed-loop high-voltage power supply based on purified current monitoring includes the following steps:
s1, a main loop boost circuit, which includes a power supply device 11 for providing power, an oscillation circuit 12 electrically connected to the power supply device 11 and performing reverse processing on current, a power regulation module 13 electrically connected to the rear end of the oscillation circuit 12, a driving circuit 14 electrically connected to the power regulation module 13 for performing power amplification processing on pulse signals, and a high voltage output circuit 15 disposed at the output end of the driving circuit 14, wherein the high voltage output circuit 15 provides high voltage power to a load device 16;
s2, a constant voltage closed loop control including a voltage detection module 21 detecting a voltage value of the high voltage output circuit 15, a conventional constant voltage module 22 comparing the voltage values and providing voltage compensation, and an addition circuit 23 provided between the conventional constant voltage module 22 and the power adjustment module 13, the addition circuit 23 compensating the voltage input to the power adjustment module 13;
s3, an undercurrent compensation closed-loop control, where the undercurrent compensation closed-loop control includes an output current detection unit 31 electrically connected to the high voltage output circuit 15 and a setting compensation unit 32 for controlling voltage compensation of the power regulation module 13, the setting compensation unit 32 is electrically connected between the output current detection unit 31 and the addition circuit 23, the output current detection unit 31 detects a current signal value of the high voltage output circuit 15 and inputs the current signal value to the setting compensation unit 32, and when the current signal detected by the output current detection unit 31 is lower than a threshold setting value of the setting compensation unit 32, the setting compensation unit 32 determines and controls to be conducted to the addition circuit 23, and otherwise, the current signal is cut off.
It should be noted that a weak current power conversion module 17 is further disposed on one side of the power supply device 11, and the weak current power conversion module 17 provides an operating voltage for the power supply device 11, the power regulation module 13, the normal constant voltage module 22, and the setting compensation unit 32.
Further, the rated voltage U of the clean electric field is set to be 12.5kV to 13.5kV, the rated current I corresponding to the rated voltage U is 11mA to 13mA, and the threshold value set value of the setting compensation unit 32 is 0.6I to 0.8I.
Further, a threshold set value of the setting compensation unit 32 is 0.7I, if the output current detection unit 31 detects that the current signal value reaches 0.7I for the first time, the setting compensation unit 32 provides a compensation voltage for the addition circuit 23, the rated voltage U of the electric field is controlled to increase to U + Δ U, and Δ U is set to be 0.5-1.5 kV; if the output current detection unit 31 detects that the current signal value reaches 0.7I for the second time, the setting compensation unit 32 sends out a cleaning instruction, wherein I is the rated current.
It should be noted that, during the use of the purifier, the purification effect is obvious when the working current of the purifier is usually maintained at 0.7-1.2 times of the rated current I, however, the working current is reduced due to the increase of impurities for purifying and collecting dust, when the working current is reduced to 0.6 times of the rated current I, the purification effect of the purifier is subject to failure, the threshold set value of the setting compensation unit 32 is 0.6I-0.8I, and the working current is reduced below the threshold set value, that is, the compensation hysteresis unit 43 is controlled to operate, so as to continue to maintain the purification operation, and prolong the purification time.
Further, the method also comprises the step of determining the transverse displacement d of the oil drop particles through the adsorption area according to the working current Ip, and the calculation formula obtained by Newton mechanics and electromagnetism is specifically expressed as follows:
Figure BDA0002684855440000071
wherein U isLVAnd the voltage of an adsorption area of a purification electric field is represented, q is the charge amount of oil drop particles and is calculated by the working current Ip (Ip is q/t), m is the mass of the oil drop particles, L is the length of an adsorption polar plate, D is the distance between the adsorption polar plates, and V is the wind speed.
Specifically, it is obtained from newton mechanics and electromagnetism:
Figure BDA0002684855440000072
while
Figure BDA0002684855440000073
Substituting (2) into (1) to obtain:
Figure BDA0002684855440000074
wherein E is the electric field strength; the larger d is, the more oil droplet particles on the positive plate are captured by the electric field force on the surface, and the higher the purification rate is.
Further, the ratio of the transverse displacement D of the charged particles through the adsorption zone to the distance D between the polar plates represents the purification rate G of the purifier, which is specifically expressed as:
purification rate
Figure BDA0002684855440000075
By air quantity A3600 VSCross section ofWind velocity
Figure BDA0002684855440000076
Substituting into (3) to obtain:
Figure BDA0002684855440000081
as shown in fig. 3, the cross-sectional area SCross section ofIs the product of the height H and the width W of the adsorption electric field;
and the adsorption area
Figure BDA0002684855440000082
Wherein SSingle sheetIs a monolithic adsorption electrode surface area, SAdsorptionFor the total adsorption area of the adsorption electric field, N is the number of the polar plates of the adsorption electric field, so that:
Figure BDA0002684855440000083
the ratio of the adsorption area to the air flow is represented by Y, i.e.
Figure BDA0002684855440000084
Substituted into (6) to obtain
Figure BDA0002684855440000085
Wherein Y is the ratio of the adsorption area to the air volume, ULVAnd the voltage of an adsorption area of a purifying electric field is represented, q is the electric charge of oil drop particles and is calculated by the working current Ip (Ip is q/t), and m is the mass of the oil drop particles.
The above equation shows that the larger the amount q of electricity charged to the oil droplet particles is, the higher the purification rate is, and the amount q of electricity is determined by the operating current Ip, so the operating current Ip is the main determining amount, under the condition that the electric field size and the wind speed are constant.
Further, the setting compensation unit 32 is adjusted by an operational amplifier circuit, the setting compensation unit 32 includes a bias amplifier group 322 and an electronic switch group 323 which are electrically connected, the bias amplifier group 322 determines a voltage compensation value, and the electronic switch group 323 controls output on-off of the voltage compensation value of the bias amplifier group 322.
Further, the bias amplifying group 322 includes an operational amplifier U1D3221 and a first peripheral element 3222, the first peripheral element 3222 cooperates with the operational amplifier U1D3221 to form a reverse bias amplifying circuit, the electronic switch group 323 includes an operational amplifier U1a3231 and a second peripheral element 3232, the operational amplifier U1a3231 receives a sampled current signal, and the second peripheral element 3232 controls the compensation voltage of the bias amplifying group 322 to be switched on or switched off.
Further, the voltage compensation mode of the setting compensation unit 32 adopts inverse proportion adaptive boosting.
It should be noted that the inverse proportion adaptive boosting, i.e. the working current, is decreased, and the compensation voltage makes the output high voltage rise in a stable inverse proportion curve, so that the output power of the high voltage power supply is maintained at the same value, and the effect of adsorbing the oil drop particles is maintained stable.
Specifically, the rated voltage U of the clean electric field is set to be 13kV, and the rated current for normal work is 12 mA; when the electric field continuously adsorbs and enriches oil stains, the working current is gradually reduced to 8.5mA, and in the period, although the current is reduced, the purification rate is correspondingly reduced, but the current is still in an acceptable normal working range, and the power supply still works in a closed-loop constant-voltage mode; when the working current is further reduced to 8.4mA, the second current monitoring closed loop of the power supply judges that the working current Ip is lower than 70% of the rated current, and the normal purification requirement cannot be met, a compensation current stabilization instruction is sent out, the output high voltage is increased to 13.8kV, the output current correspondingly rises back to 11mA, and then the novel compensation boosting closed loop constant voltage mode is operated to maintain the normal purification effect. As the adsorbed oil is further enriched, the power supply indicates cleaning when the operating current Ip is again reduced to 8.4 mA. The electric field discharge capacity after cleaning is recovered, and the power supply works in a closed-loop constant-voltage mode with high voltage of 13kV and normal working current of 12 mA. The above process is cycled again.
Example 2:
as shown in fig. 6 and 7, in which the same or corresponding components as in the first embodiment are denoted by the same reference numerals as in the first embodiment, only the points of difference from the first embodiment will be described below for the sake of convenience. The second embodiment is different from the first embodiment in that:
in this embodiment, the setting compensation unit 32 adopts a constant voltage step boosting mode to compensate the voltage.
When the working current is reduced to the threshold value set value, the constant voltage value step boosting is adopted, so that the voltage can be boosted for the main loop instantly, and the working power is improved.
It is worth mentioning that step boosting can be set to a multi-section boosting mode, so that multi-stage compensation is facilitated, and the problem of power reduction caused by gradual reduction of working current is solved.
Example 3:
as shown in fig. 1 and 8, in which the same or corresponding components as those in the first embodiment or the second embodiment are denoted by the same reference numerals as those in the first embodiment or the second embodiment, only the differences from the first embodiment or the second embodiment will be described below for the sake of convenience. The third embodiment is different from the first embodiment or the second embodiment in that:
further, the setting compensation unit 32 further includes an operational amplifier U1B321, a threshold setting group 324, and a cleaning signal group 325, where the operational amplifier U1B321 is respectively electrically connected to the bias amplification group 322 and the electronic switch group 323, the threshold setting group 324 is respectively electrically connected to the bias amplification group 322, the electronic switch group 323, and the cleaning signal group 325, the bias amplification group 322 determines a voltage compensation value, the electronic switch group 323 controls on/off of output of the bias amplification group 322, and the cleaning signal group 325 determines a current signal value and controls emission of a cleaning indication signal.
The operational amplifier U1B321 is configured to normalize the detected current signal, and then input the normalized current signal to the bias amplification group 322 and the electronic switch group 323, and the threshold setting group 324 is configured to set a threshold to control the activation of the electronic switch group 323.
It should be further noted that the cleaning signal group 325 includes an operational amplifier U1C3251 and a third peripheral element 3252, and the operational amplifier U1C3251 receives the signals of the bias amplifying group 322 and the threshold setting group 324 and sends an indication signal by the third peripheral element 3252.
Example 4:
as shown in fig. 1 and 9, the present embodiment provides another implementation form of the first and third embodiments:
in this embodiment, the setting compensation unit 32 is controlled by sampling and calculating of a single chip MCU, and includes a first analog-to-digital converter 326, a CPU calculating element 327, a threshold value adjusting unit 328, a control signal unit 329, and a status indicator 320, where the CPU calculating element 327 is electrically connected to the first analog-to-digital converter 326, the threshold value adjusting unit 328, the control signal unit 329, and the status indicator 320, respectively, the first analog-to-digital converter 326 inputs the converted electrical signal to the CPU calculating element 327, the threshold value adjusting unit 328 adjusts an operation threshold value of the CPU calculating element 327, the control signal unit 329 determines a voltage compensation value and outputs the voltage compensation value, and the status indicator 320 indicates a status signal.
The MCU controls the output voltage, and the value of the compensation voltage can be changed in a program manner, and continuous voltage compensation can be performed easily without being limited to multi-stage switching.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (10)

1. A voltage regulation method of a double closed-loop high-voltage power supply based on purified current monitoring is characterized by comprising the following steps:
s1, boosting a main loop, wherein the boosting of the main loop comprises a power supply device (11) for providing power, an oscillating circuit (12) which is electrically connected with the power supply device (11) and carries out reverse processing on current, a power regulating module (13) which is electrically connected with the rear end of the oscillating circuit (12), a driving circuit (14) which is electrically connected with the power regulating module (13) and carries out power amplification processing on pulse signals, and a high-voltage output circuit (15) which is arranged at the output end of the driving circuit (14), and the high-voltage output circuit (15) provides high-voltage power to a load device (16);
s2, a constant voltage closed loop control including a voltage detection module (21) detecting a voltage value of a high voltage output circuit (15), a conventional constant voltage module (22) comparing the voltage values and providing voltage compensation, and an addition circuit (23) provided between the conventional constant voltage module (22) and a power regulation module (13), the addition circuit (23) compensating a voltage input to the power regulation module (13);
s3, an undercurrent compensation closed-loop control, which comprises an output current detection unit (31) electrically connected with the high-voltage output circuit (15) and a setting compensation unit (32) used for controlling voltage compensation of a power regulation module (13), wherein the setting compensation unit (32) is electrically connected between the output current detection unit (31) and the addition circuit (23), the output current detection unit (31) detects the current signal value of the high-voltage output circuit (15) and inputs the current signal value to the setting compensation unit (32), when the current signal detected by the output current detection unit (31) is lower than the threshold value set value of the setting compensation unit (32), the setting compensation unit (32) judges and controls to be conducted to the addition circuit (23), otherwise, the current signal is cut off;
the rated current I is 11-13 mA, and the threshold value set value of the setting compensation unit (32) is 0.6-0.8I.
2. The voltage regulating method of the double closed-loop high-voltage power supply based on the purified current monitoring as claimed in claim 1, wherein a rated voltage U of a clean electric field is set to be 12.5kV to 13.5 kV.
3. The voltage regulating method of the double closed-loop high-voltage power supply based on the purified current monitoring as claimed in claim 2, wherein the threshold setting value of the setting compensation unit (32) is 0.7I, if the output current detection unit (31) detects that the current signal value reaches 0.7I for the first time, the setting compensation unit (32) provides compensation voltage for the addition circuit (23), the rated voltage U of the electric field is controlled to increase to U + DeltaU, and the DeltaU is set to be 0.5-1.5 kV; and if the output current detection unit (31) detects that the current signal value reaches 0.7I for the second time, the setting compensation unit (32) sends out a cleaning instruction.
4. The voltage regulating method of the double closed-loop high-voltage power supply based on the purified current monitoring as claimed in claim 3, further comprising determining a lateral displacement d of oil drop particles through the adsorption region according to a rated current I, specifically represented as:
Figure FDA0003585189460000021
wherein U isLVRepresenting the voltage of an adsorption area of a purification electric field, q is the charge amount of oil drop particles (deduced from a rated current I), m is the mass of the oil drop particles, L is the length of an adsorption polar plate, D is the distance between the adsorption polar plates, and V is the wind speed; and
the purification rate G is estimated from the lateral displacement d, and is specifically expressed as:
Figure FDA0003585189460000022
wherein Y is the ratio of the adsorption area to the air volume;
by air quantity A being 3600VSCross section ofWind velocity
Figure FDA0003585189460000023
Substitution into the purification rate
Figure FDA0003585189460000024
Obtaining:
Figure FDA0003585189460000025
wherein the cross-sectional area SCross section ofIs the product of the height H and the width W of the adsorption electric field;
and the adsorption area
Figure FDA0003585189460000026
Wherein SSingle sheetIs a monolithic adsorption electrode surface area, SAdsorptionFor the total adsorption area of the adsorption electric field, N is the number of the polar plates of the adsorption electric field, so that:
Figure FDA0003585189460000027
5. the voltage regulating method of the double closed-loop high-voltage power supply based on the purified current monitoring is characterized in that the setting compensation unit (32) is regulated through an operational amplifier circuit, the setting compensation unit (32) comprises a bias amplification group (322) and an electronic switch group (323) which are electrically connected, the bias amplification group (322) determines a voltage compensation value, and the electronic switch group (323) controls the output on-off of the voltage compensation value of the bias amplification group (322).
6. The voltage regulating method of the double closed-loop high-voltage power supply based on the purified current monitoring as claimed in claim 5, wherein the setting compensation unit (32) further comprises an operational amplifier U1B (321), a threshold setting group (324) and a cleaning signal group (325), the operational amplifier U1B (321) is electrically connected with the bias amplifying group (322) and the electronic switch group (323) respectively, the threshold setting group (324) is electrically connected with the bias amplifying group (322), the electronic switch group (323) and the cleaning signal group (325) respectively, the bias amplifying group (322) determines a voltage compensation value, the electronic switch group (323) controls the output on-off of the bias amplifying group (322), and the cleaning signal group (325) determines a current signal value and controls the emission of a cleaning indication signal.
7. The voltage regulating method of the double-closed-loop high-voltage power supply based on the purified current monitoring is characterized in that a bias amplification group (322) comprises an operational amplifier U1D (3221) and a first peripheral element (3222), the first peripheral element (3222) is matched with the operational amplifier U1D (3221) to form a reverse bias amplification circuit, the electronic switch group (323) comprises an operational amplifier U1A (3231) and a second peripheral element (3232), the operational amplifier U1A (3231) receives a sampled current signal, and the second peripheral element (3232) controls the compensation voltage of the bias amplification group (322) to be switched on or switched off.
8. The method of claim 4, wherein the voltage regulation of the dual closed-loop high-voltage power supply is based on the monitoring of the purified current, it is characterized in that the setting compensation unit (32) is controlled by sampling calculation of a single chip microcomputer MCU, it comprises a first analog-to-digital conversion part (326), a CPU calculation element (327), a threshold value adjusting part (328), a control signal part (329) and a state indicating part (320), the CPU computing element (327) is respectively and electrically connected with the first analog-to-digital converter (326), the threshold value adjusting part (328), the control signal part (329) and the status indicator (320), the first analog-to-digital conversion part (326) inputs the converted electric signal to the CPU calculation element (327), the threshold value adjustment unit (328) adjusts the operation threshold value of the CPU computation element (327), the control signal part (329) determines a voltage compensation value and outputs the voltage compensation value, and the state indicator (320) indicates a state signal.
9. The voltage regulating method for the double closed-loop high-voltage power supply based on the purified current monitoring is characterized in that the mode of setting the compensation unit (32) to compensate the voltage adopts inverse proportion self-adaptive boosting.
10. The voltage regulation method of the double closed-loop high-voltage power supply based on the purified current monitoring is characterized in that the voltage compensation mode of the setting compensation unit (32) adopts a constant voltage value step boosting mode.
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