CN111505388B - Device and method for monitoring output capacitance tan delta of CCM buck converter - Google Patents
Device and method for monitoring output capacitance tan delta of CCM buck converter Download PDFInfo
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- CN111505388B CN111505388B CN202010335855.5A CN202010335855A CN111505388B CN 111505388 B CN111505388 B CN 111505388B CN 202010335855 A CN202010335855 A CN 202010335855A CN 111505388 B CN111505388 B CN 111505388B
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- 238000012806 monitoring device Methods 0.000 claims description 4
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
Abstract
The invention belongs to the field of fault prediction and health management in an electric energy conversion device, and discloses a device and a method for monitoring an output capacitance tan delta of a CCM buck converter.The device comprises a Buck converter main power circuit, a power control unit, a driving unit, a high-pass filtering unit and an upper computer, wherein the upper computer comprises a first high-pass filter, an integrator, a second high-pass filter, a tan delta calculating unit and a display unit; the method comprises the steps of detecting a driving signal of a switching tube, sequentially passing through a first high-pass filter, an integrator and a second high-pass filter to obtain a reference voltage vrOn the other hand, the output voltage obtains an output voltage alternating current component v through a high-pass filtering unito_acV is to berAnd vo_acAnd sending the current tan delta value into a capacitance loss tangent value tan delta calculation unit to obtain the current tan delta value of the output capacitance in the Buck converter. The method provided by the invention does not need a current sensor, does not influence the normal work of the converter, and provides a basis for the health monitoring of the capacitor.
Description
Technical Field
The invention belongs to the field of fault prediction and health management in an electric energy conversion device, and particularly relates to a device and a method for monitoring an output capacitance tan delta of a CCM buck converter.
Background
Due to the advantages of high efficiency, small volume, low noise and the like, the power electronic converter is widely applied to the fields of military, aerospace, industry and the like. In power electronic converters, capacitors, which are most commonly used, must be used to filter out high frequency noise in order to obtain a higher quality output voltage. There are investigations to indicate that electrolytic capacitors are the most inefficient power devices in power electronic converters. After the electrolytic capacitor is used for a period of time, the equivalent series resistance ESR of the capacitor can be increased, the capacitance value C of the capacitor can be reduced, and when the equivalent series resistance ESR and the capacitance value C of the capacitor are changed to a certain degree, the capacitor can be considered to be failed, and the failure of the capacitor can cause the operation faults of a converter and a system. In industry, the loss tangent of electrolytic capacitor and the capacitance of capacitor are important indicators for measuring the health of capacitor. The Buck-type direct-current converter is widely used in the fields of new energy power generation, computer power supply, communication power supply and the like, so that the monitoring of the loss tangent value of the output filter capacitor of the Buck-type direct-current converter is important for evaluating the health condition of the Buck-type direct-current converter. However, the conventional Buck-type dc-dc converter output capacitance health monitoring mostly focuses on online identification of ESR and C, and the identification process is complex, so that a simple and general capacitance health monitoring method cannot be provided.
Disclosure of Invention
In view of this, the present invention provides a device and a method for monitoring the output capacitance tan δ of a CCM buck converter, which can monitor the change of the loss tangent tan δ in real time on line, and monitor the health status of the electrolytic capacitor.
The invention adopts the following technical scheme for solving the technical problems:
the invention provides a monitoring device for output capacitance tan delta of a CCM (continuous current mode) Buck converter, which comprises a Buck-type converter active rate circuit, a power control unit, a driving unit, a high-pass filtering unit and an upper computer, wherein the upper computer has the functions of a first high-pass filter, an integrator, a second high-pass filter, a tan delta calculating unit and a display unit;
the Buck converter main circuit comprises an input voltage source VinPower switch network, inductor LfFilter capacitor and load RLThe filter capacitor comprises an Equivalent Series Resistance (ESR) and a capacitor CfWherein the input ends of the power switch networks are respectively connected with an input voltage source VinThe positive output end of the power switch network is connected with an inductor LfOne terminal of (1), inductance LfThe other end is respectively connected with equivalent series resistance ESR and load RLIs connected to the other end of the equivalent series resistance ESR and the capacitor CfIs connected to a capacitor CfAnother end of (1) and a load RLThe other ends of the two ends of the three-phase current transformer are connected with the output negative end of the power switch network, and a load RLThe voltage at both ends is the output voltage vo；
Input and output voltage v of the power control unitoThe driving signals output by the power control unit are respectively sent to the driving unit and the upper computer;
the input end of the high-pass filtering unit is connected with the output voltage voOutput an output voltage AC component signal vo_acSending to an upper computer;
the output of the driving unit is connected with a switch network;
the upper computer receives the driving signal and outputs voltageFlow component signal vo_acThe driving signal passes through the first high-pass filter, the integrator and the second high-pass filter in sequence to obtain a reference signal vrFed to tan delta calculating unit, signal vo_acDirectly sending to the tan delta calculating unit, and sending the calculation result of the tan delta calculating unit to the display unit.
The invention also provides a method for monitoring the output capacitance tan delta of the CCM buck converter, which comprises the following steps:
Further, the calculation formula of tan δ in step 3 is:
compared with the prior art, the invention has the following remarkable advantages:
1. the invention does not need to detect current signals and does not need a current sensor;
2. the invention is suitable for the Buck converter with double-loop control of output voltage single loop and output voltage and inductive current, and does not need to introduce a new sampling point;
3. the circuit is simple, accurate monitoring of tan delta can be achieved on the basis that the number of sensors is not increased, and the method has important practical application value.
Drawings
FIG. 1 is a schematic diagram of a device and method for monitoring the output capacitance tan δ of a CCM buck converter according to the present invention;
fig. 2 is a waveform diagram illustrating the operation of the CCM Buck converter of the present invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
referring to fig. 1, the present invention provides a monitoring device for output capacitance tan δ of a CCM Buck converter, which is characterized in that the monitoring device comprises a Buck converter active rate circuit 1, a power control unit 2, a driving unit 3, a high-pass filtering unit 4 and an upper computer, wherein the upper computer function comprises a first high-pass filter 5, an integrator 6, a second high-pass filter 7, a tan δ calculating unit 8 and a display unit 9;
the Buck converter main circuit 1 comprises an input voltage source VinPower switch network, inductor LfFilter capacitor and load RLThe filter capacitor comprises an Equivalent Series Resistance (ESR) and a capacitor CfWherein the input ends of the power switch networks are respectively connected with an input voltage source VinThe positive output end of the power switch network is connected with an inductor LfOne terminal of (1), inductance LfThe other end is respectively connected with equivalent series resistance ESR and load RLIs connected to the other end of the equivalent series resistance ESR and the capacitor CfIs connected to a capacitor CfAnother end of (1) and a load RLThe other ends of the two ends of the three-phase current transformer are connected with the output negative end of the power switch network, and a load RLThe voltage at both ends is the output voltage vo；
The input and output voltage v of the power control unit 2oThe driving signals output by the power control unit 2 are respectively sent to the driving unit 3 and the upper computer;
the input end of the high-pass filtering unit 4 is connected with the output voltage voOutput an output voltage AC component signal vo_acSending to an upper computer;
the output of the driving unit 3 is connected with a switch network;
the upper computer receives the driving signal and outputs electricityVoltage ac component signal vo_acThe driving signal passes through the first high-pass filter 5, the integrator 6 and the second high-pass filter 7 in sequence to obtain the reference signal vrSending to tan delta calculating unit 8, and outputting voltage alternating component signal vo_acDirectly sent to the tan delta calculating unit 8, and the calculation result of the tan delta calculating unit 8 is sent to the display unit 9.
The invention also discloses a method for monitoring the output capacitance tan delta of the CCM buck converter, which comprises the following steps:
if the number of sampling points is N, the obtained reference signal component is Vr(1,2, …, N) and the AC component of the output voltage is Vo_ac(1,2, …, N), tan δ is calculated as:
fig. 2 is a waveform diagram showing the operation of the CCM Buck converter of the present invention. The invention provides a simulation result obtained by monitoring the loss tangent value of the output capacitor of a Buck converterThe simulation conditions are as follows: input voltage Vin24V, inductance Lf220 muH, switching frequency fs50kHz, sampling frequency fc10 MHz. Firstly, simulating the circuit operation, and driving signals and v after the operation is stoppedo_acThe data is introduced into the workplace of matlab for data processing, and simulation results under different conditions are shown in table 1, so that the monitoring method for the output capacitance tan delta of the CCM Buck converter provided by the invention has higher tracking accuracy.
TABLE 1
| Cf/μF | 100 | 100 | 50 | 100 | 100 |
| ESR/Ω | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 |
| Duty cycle D | 0.5 | 0.3 | 0.5 | 0.5 | 0.5 |
| RL/Ω | 10 | 10 | 10 | 10 | 5 |
| Theoretical value of Tan delta | 3.14 | 3.14 | 3.14 | 6.28 | 6.28 |
| tan delta estimate | 3.0424 | 3.0431 | 3.0893 | 5.9418 | 6.0483 |
The device and the method for monitoring the output capacitance tan delta of the CCM buck converter have the advantages that a current sensor is not needed, a new measuring point is not needed to be introduced, the normal work of the converter is not influenced, and the method is simple and easy to implement.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A monitoring method for output capacitance tan delta of a CCM Buck converter is characterized in that a monitoring device adopted by the monitoring method comprises a Buck converter main circuit (1), a power control unit (2), a driving unit (3), a high-pass filtering unit (4) and an upper computer, wherein the upper computer comprises a first high-pass filter (5), an integrator (6), a second high-pass filter (7), a tan delta calculating unit (8) and a display unit (9);
the Buck converter main circuit (1) comprises an input voltage source VinPower switch network, inductor LfFilter capacitor and load RLThe filter capacitor comprises an Equivalent Series Resistance (ESR) and a capacitor CfWherein the input ends of the power switch networks are respectively connected with an input voltage source VinThe positive output end of the power switch network is connected with an inductor LfOne terminal of (1), inductance LfThe other end is respectively connected with equivalent series resistance ESR and load RLIs connected to the other end of the equivalent series resistance ESR and the capacitor CfIs connected to a capacitor CfAnother end of (1) and a load RLThe other ends of the two ends of the three-phase current transformer are connected with the output negative end of the power switch network, and a load RLThe voltage at both ends is the output voltage vo；
The input end and the output voltage v of the power control unit (2)oThe driving signals output by the power control unit (2) are respectively sent to the driving unit (3) and the upper computer;
the input end of the high-pass filtering unit (4) is connected with the output voltage voOutput an output voltage AC component signal vo_acSending to an upper computer;
the output of the driving unit (3) is connected with a switch network;
the upper computer receives the driving signal and the output voltage alternating current component signal vo_acThe driving signal passes through a first high-pass filter (5), an integrator (6) and a second high-pass filter (7) in sequence to obtain a reference signal vrSending to a tan delta calculation unit (8) to output a voltage alternating component signal vo_acDirectly sending to a tan delta calculating unit (8), and sending the calculation result of the tan delta calculating unit (8) to a display unit (9);
the monitoring method comprises the following steps:
step 1, a drive signal output by a power control unit (2) passes through a first high-pass filter (5), an integrator (6) and a second high-pass filter (7) in sequence to obtain a reference signal vrFeeding to a tan delta calculation unit (8) while collecting the output voltage voObtaining an output voltage alternating current component signal v through a high-pass filtering unit (4)o_acFeeding to a tan delta calculation unit (8);
step 2, the tan delta calculating unit (8) outputs an alternating current component signal v according to the input output voltageo_acAnd a reference signal vrTan delta is calculated, and the calculated tan delta value is sent to a display unit (9) for real-time display;
wherein, the calculation formula of tan delta is as follows:
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| KR100998577B1 (en) * | 2007-08-29 | 2010-12-07 | 주식회사 와튼 | Aging status diognostic equipment for power conversion system, and method their of |
| CN201429655Y (en) * | 2009-07-14 | 2010-03-24 | 四川电力试验研究院 | Dielectric loss measuring apparatus for high voltage equipment |
| CN103412265B (en) * | 2013-08-09 | 2017-03-15 | 南京理工大学 | CCM buck converter output capacitance ESR and the monitoring device and method of C |
| CN108226654B (en) * | 2018-01-31 | 2020-06-30 | 深圳供电局有限公司 | Full-automatic dielectric loss measurement system |
| CN108362947B (en) * | 2018-01-31 | 2020-08-07 | 南京航空航天大学 | Method and system for monitoring loss tangent value of output capacitor of Buck-type direct-current converter |
| CN110320425B (en) * | 2019-07-24 | 2021-06-15 | 南通大学 | ESR (equivalent series resistance) monitoring method for output capacitor of Buck-type direct-current-direct-current converter |
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Application publication date: 20200807 Assignee: Jiangsu Indars Automation Technology Co.,Ltd. Assignor: NANTONG University Contract record no.: X2022320000288 Denomination of invention: Output capacitor tan of CCM step-down converter d Monitoring device and method of Granted publication date: 20211116 License type: Common License Record date: 20221130 |
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Application publication date: 20200807 Assignee: NANTONG ZHONGNENG MACHINERY Co.,Ltd. Assignor: NANTONG University Contract record no.: X2023980053318 Denomination of invention: CCM step-down converter output capacitor tan d Monitoring device and method Granted publication date: 20211116 License type: Common License Record date: 20231221 |