CN108258892B - Power conversion device and control method thereof - Google Patents
Power conversion device and control method thereof Download PDFInfo
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- CN108258892B CN108258892B CN201611238101.8A CN201611238101A CN108258892B CN 108258892 B CN108258892 B CN 108258892B CN 201611238101 A CN201611238101 A CN 201611238101A CN 108258892 B CN108258892 B CN 108258892B
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
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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
- H02M1/0003—Details of control, feedback or regulation circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
A power conversion device and a control method thereof are provided with a conversion circuit, a filter circuit, a measurement circuit and a control circuit. The conversion circuit converts the voltage signal into an operation signal and adjusts the operation voltage value and the operation frequency of the operation signal according to the control signal. The filter circuit generates a working current according to the operation signal. The measuring circuit is used for measuring the magnitude of the working current. When the product of the operating frequency of the operating signal and the operating voltage value exceeds the limit value, the control circuit adjusts the control signal or controls the conversion circuit to stop converting the voltage signal according to the magnitude of the working current. The limit value is set according to the product of the operating frequency of the operating signal and the operating voltage value when the magnitude of the operating current reaches the rated current value of the filter circuit.
Description
Technical Field
The present invention relates to a power conversion apparatus and a control method thereof, and more particularly, to a power conversion apparatus having an output operation range and a control method thereof.
Background
The power conversion device mainly converts a voltage signal into an operation power suitable for various electronic devices, loads or other electric devices. The power conversion device can generate an operation power according to the setting of a user and can also output an amplified voltage signal according to an input voltage signal.
In general, when the power converter outputs only a basic waveform, for example, a sine wave, the power converter may limit the output voltage peak value and the root mean square value according to the voltage value of the basic waveform. However, when the sine wave output by the power converter has a carrier wave or other square waves or higher harmonics, the power converter needs to have a better computation performance to cope with the complicated process of detecting the output signal because the output signals need to be analyzed by analyzing a large amount of data to limit the output voltage peak value and the root mean square value according to the voltage value of the output waveform, so that the cost of the power converter is increased. In addition, even though the power converter can limit the peak value and the root mean square value of the output voltage according to the voltage value of the basic waveform, the current power converter does not limit the output operation range according to the voltage value of the basic waveform. Without limiting the output operation range, the internal components of the power converter may operate under an excess condition, thereby increasing the chance of damage to the power converter.
Disclosure of Invention
The present invention provides a power conversion apparatus and a control method thereof, so as to solve the problem that the conventional power converter is not based on the limitation of the output operation range.
The invention discloses a power conversion device and a control method thereof. The conversion circuit converts the voltage signal into an operation signal and adjusts the operation voltage value and the operation frequency of the operation signal according to the control signal. The filter circuit is electrically connected with the conversion circuit and generates working current according to the operation signal. The measuring circuit is electrically connected with the filter circuit to measure the magnitude of the working current. The control circuit is electrically connected with the measuring circuit and the conversion circuit, and when the product of the operating frequency of the operating signal and the operating voltage value exceeds the limit value, the control circuit adjusts the control signal or controls the conversion circuit to stop converting the voltage signal according to the magnitude of the working current. The limiting value is set according to the product of the operating frequency of the operating signal and the operating voltage value when the magnitude of the operating current reaches the rated current value of the filter circuit.
According to the power conversion apparatus and the control method thereof disclosed by the invention, when the current of the filter circuit reaches the rated current value, the product of the operation voltage value and the operation frequency of the operation signal converted by the conversion circuit is used as the limit value of the power conversion apparatus. Therefore, when the product of the operating frequency and the operating voltage value of the operating signal exceeds the limit value, the frequency and the voltage value of the operating signal output by the conversion circuit can be adjusted, or the conversion circuit is controlled to stop outputting the operating signal, so that the elements in the power conversion device can not operate excessively, and the output frequency range of the power converter is further defined. In addition, no matter whether the signal output by the power conversion device is a higher harmonic wave or not, the working current on the filter circuit can be quickly detected, and the power conversion device does not need to analyze a large amount of data, so that the system calculation amount of the power conversion device is reduced, the cost is reduced, and the peak value, the root mean square value or the output frequency range of the output voltage can still be effectively limited.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is a functional block diagram of a power conversion apparatus according to an embodiment of the invention;
fig. 2 is a circuit diagram of a power conversion device according to another embodiment of the invention;
fig. 3 is a flowchart illustrating steps of a control method according to an embodiment of the invention.
Wherein the reference numerals
10. 20 power supply conversion device
11. 21 switching circuit
13. 23 filter circuit
15. 25 measurement circuit
17. 27 control circuit
30 power supply
40 load
M1 first switch
M2 second switch
M3 third switch
M4 fourth switch
XA-XD control signals
L1, L2 inductance
R resistance
C capacitor
Detailed Description
The detailed features and advantages of the present invention are described in detail in the following embodiments, which are sufficient for anyone skilled in the art to understand the technical contents of the present invention and to implement the present invention, and the objectives and advantages related to the present invention can be easily understood by anyone skilled in the art according to the disclosure of the present specification, the scope of the claims and the accompanying drawings. The following examples further illustrate aspects of the present invention in detail, but are not intended to limit the scope of the invention in any way.
Referring to fig. 1, fig. 1 is a functional block diagram of a power conversion device according to an embodiment of the invention. As shown in fig. 1, the power conversion apparatus 10 includes a conversion circuit 11, a filter circuit 13, a measurement circuit 15, and a control circuit 17. The converting circuit 11 converts the voltage signal into an operating signal, and adjusts the operating voltage value and the operating frequency of the operating signal according to the control signal, wherein the voltage signal may be an ac signal or a dc signal. The filter circuit 13 is electrically connected to the conversion circuit 11, and generates a working current according to the operation signal output by the conversion circuit 11. The measuring circuit 15 is electrically connected to the filter circuit 13 for measuring the magnitude of the operating current generated by the filter circuit 13. The control circuit 17 is electrically connected to the measuring circuit 15 and the converting circuit 11, and when the product of the operating frequency of the operating signal and the operating voltage exceeds the limit value, the control circuit 17 adjusts the control signal or controls the converting circuit 11 to stop converting the voltage signal according to the magnitude of the operating current.
The limit value is set according to the product of the operating frequency of the operating signal and the operating voltage value when the magnitude of the operating current reaches the rated current value of the filter circuit 13. The rated current value of the filter circuit 13 is, for example, the maximum current value operable on the filter circuit 13, the maximum current value at which the filter circuit 13 safely operates, or other rated values associated with the filter circuit 13. The maximum current value at which the filter circuit 13 is safely operated is, for example, the maximum operable current value of the filter circuit 13, and the current value after derating is, for example, 90%, 80%, 75% of the maximum operable current value or other derating criteria. In other embodiments, the limit value may be set according to the product of the operating frequency of the operating signal and the operating voltage value when the current value of one element in the filter circuit 13 reaches the rated current value. It should be understood by those skilled in the art that the operating current of the filter circuit 13 reaches the rated current, and the operating power of the filter circuit 13 may also be regarded as the operating power of the filter circuit 13 reaching the rated power or the operating voltage of the filter circuit 13 reaching the rated voltage.
Next, referring to fig. 2, fig. 2 is a circuit schematic diagram of a power conversion device according to another embodiment of the invention. As shown in fig. 2, the power conversion apparatus 20 includes a conversion circuit 21, a filter circuit 23, a measurement circuit 25, and a control circuit 27. The conversion circuit 21 is, for example, a bridge converter, a dc-to-ac converter, a dc-to-dc converter or other suitable converter. In one embodiment, the converting circuit 21 has a first switch M1, a second switch M2, a third switch M3 and a fourth switch M4. The first switch M1 and the second switch M2 are connected in series to form a first series branch, the third switch M3 and the fourth switch M4 are connected in series to form a second series branch, and the first series branch and the second series branch are connected in parallel to form the converting circuit 21. The first series branch and the second series branch are respectively electrically connected to two ends of the power supply 30 to receive the voltage signal output by the power supply 30.
The filter circuit 23 is, for example, an LC filter, an inductive filter, an RC filter, a pi filter, or another suitable filter. For the LC filter, the filter circuit 23 has an inductor L1, an inductor L2, a resistor R and a capacitor C connected in series, and two ends of the filter circuit 23 are electrically connected between the first switch M1 and the second switch M2 and between the third switch M3 and the fourth switch M4, respectively, so as to receive an operation signal generated by converting the voltage signal by the conversion circuit 21.
In one embodiment, the first switch M1, the second switch M2, the third switch M3, and the fourth switch M4 of the switching circuit 21 are sequentially switched on and off according to the control signal XA, the control signal XB, the control signal XC, and the control signal XD, respectively, so as to adjust the operating voltage and the operating frequency of the operating signal. The filter circuit 23 receives the operation signal generated by the conversion circuit 21 and filters the operation signal to provide the filtered operation signal to the load 40. When the filter circuit 23 filters the operation signal, the current flowing through the capacitor C and the resistor R is the operating current Ic.
The measuring circuit 25 is electrically connected to two ends of the resistor R for measuring a voltage difference between the two ends of the resistor R. The measurement circuit 25 calculates the magnitude of the operating current Ic according to the voltage difference between the two ends of the resistor R and the resistance of the resistor R. The control circuit 27 is electrically connected to the measurement circuit 25 and the conversion circuit 21 to obtain the magnitude of the working current Ic measured by the measurement circuit 25, and adjusts the control signal or controls the conversion circuit 21 to stop converting the voltage signal according to the magnitude of the working current Ic when the product of the operating frequency of the operating signal and the operating voltage exceeds the limit value.
In one embodiment, the product of the operating frequency of the operating signal and the operating voltage value is related to the magnitude of the operating current Ic. The operating voltage of the operating signal is substantially equal to the operating voltage of the filter circuit 23 as viewed from the resistor R and the capacitor C
When the operating frequency of the operating signal is increased without changing the operating voltage value of the operating signal, the operating current Ic flowing through the resistor R is increased. When the operating frequency of the operating signal is not changed, the larger the operating voltage value of the operating signal is, the larger the operating current Ic flowing through the resistor R is. Therefore, the product of the operating frequency of the operating signal and the operating voltage is limited, so as to prevent the operating current Ic of the filter circuit 23 from being too large, and further prevent the excessive operation of the components of the filter circuit 23.
Conversely, the rated current, voltage or power of the filter circuit 23 may define the output operation range of the power converter 10, i.e. the product range of the operation frequency and the operation voltage value of the operation signal. For example, the control circuit 27 controls the converting circuit 21 to output the operating voltage value of the operating signal at a predetermined voltage value, and adjusts the operating frequency of the operating signal. The filter circuit 23 generates the operating current Ic according to the operating signal with the adjusted operating frequency. When the measurement circuit 25 measures that the working current Ic of the filter circuit 23 reaches the rated current value, the control circuit 27 takes the product of the preset voltage value and the operating frequency as the limiting value. Therefore, when the product of the operating frequency of the operating signal and the current operating voltage exceeds the limit value, the control circuit 27 can adjust the control signal or control the converting circuit 21 to stop converting the voltage signal according to the magnitude of the operating current Ic.
For practical purposes, the filter circuit 23The upper resistor R has a resistance value of, for example, 6 ohms and a maximum operating power of, for example, 100 watts. The maximum operating power of the resistor R is de-rated by, for example, 75 watts. Obtaining the standard operating voltage of the resistor R to be 21.21V according to the resistance value of the resistor R and the standard operating power of 75W
The control circuit 27 controls the converting circuit 11 to output the operation signal with the operation voltage value of 500V, and adjusts the operation frequency of the operation signal until the measurement circuit 25 measures that the voltage difference between the two ends of the resistor R is 21.21V, so as to obtain the operation frequency of the operation signal at that time, for example, 160 hz. The control circuit 27 uses the product 80000 of the voltage value 500V and the operating frequency 160 hz as a limiting value. Thereafter, when the product of the operating voltage value and the operating frequency of the output operating signal of the converter circuit 21 exceeds 80000, the control circuit 27 adjusts the generated control signal or controls the converter circuit 21 to stop converting the voltage signal.
In another example, the control circuit 27 may also control the operation frequency of the operation signal output by the conversion circuit 21 to be at a predetermined frequency, and adjust the operation voltage value of the operation signal. The filter circuit 23 generates the operating current Ic according to the operating signal with the adjusted operating voltage value. When the measurement circuit 25 measures that the working current Ic of the filter circuit 23 reaches the rated current value, the control circuit 27 takes the product of the preset frequency and the current operating voltage value as the limiting value.
When the product of the operating frequency of the operating signal and the operating voltage value exceeds the limit value, the control circuit 17 may control the conversion circuit 21 to stop converting the voltage signal, i.e., to stop the conversion circuit 11 from outputting the operating signal. The control circuit 27 can also adjust the control signal according to the magnitude of the operating current Ic. For the above example, when the operation voltage of the operation signal is substantially equal to the operation voltage
In this case, the control circuit 27 can obtain the proportional relationship between the operating voltage and the operating frequency according to the magnitude of the operating current Ic, and adjust the output control signal according to the limiting value and the proportional relationshipThe signal is used to enable the converting circuit 21 to convert the voltage signal into the operation signal according to the adjusted control signal.
In the embodiment shown in fig. 2, the measuring circuit 25 is electrically connected to two ends of the resistor R, and calculates the magnitude of the operating current Ic according to the voltage difference between the two ends of the resistor R. In practice, the measurement circuit 25 may also be a Hall sensor or a Current sensing resistor. The hall sensor senses the operating current Ic through the resistor R by electromagnetic induction. The shunt is connected in series with the resistor R, and the magnitude of the operating current Ic is calculated by the voltage on the shunt. In another example, the measurement circuit 25 may also measure the current passing through the inductor L1 and the current passing through the load 40 by a hall sensor or a current detection resistor, and calculate the magnitude of the operating current Ic by the current passing through the inductor L1 and the current passing through the load 40. The method for obtaining the operating current Ic by the measurement circuit 15 can be designed by those skilled in the art according to actual situations, and the embodiment is not limited.
To more clearly describe the control method of the power conversion apparatus, please refer to fig. 1 and fig. 3 together, and fig. 3 is a flowchart illustrating steps of the control method according to an embodiment of the invention. As shown in fig. 3, in step S501, the converting circuit 11 converts the voltage signal into an operation signal. The operation signal has an operation voltage value and an operation frequency. In step S502, the conversion circuit 11 adjusts the operation voltage value and the operation frequency of the operation signal according to the control signal output by the control circuit 17. In step S503, the operation signal generates an operating current through the filter circuit 13. In step S504, the measurement circuit 15 measures the magnitude of the operating current of the filter circuit 13. In step S505, when the product of the operating frequency of the operating signal and the operating voltage exceeds the limit value, the control circuit 17 adjusts the control signal or controls the converting circuit 11 to stop converting the voltage signal into the operating signal according to the magnitude of the operating current.
The limit value of the product of the operating frequency and the operating voltage value is set according to the product of the operating frequency and the operating voltage value of the operating signal when the magnitude of the operating current reaches the rated current value of the filter circuit 13, for example. The control method of the power conversion apparatus according to the present invention is disclosed in the embodiments described above, and the description of the embodiments is not repeated herein.
In summary, the embodiments of the present invention provide a power conversion apparatus and a control method thereof, which define an output operation range of the power conversion apparatus by a rated current, a rated voltage or a rated power of a filter circuit. That is, when the current of the filter circuit reaches the rated current value, the product of the operating voltage value and the operating frequency of the operating signal at that time is used as the basis for the control circuit to adjust the control signal. Then, when the product of the operating frequency and the operating voltage value of the operating signal generated by the conversion circuit according to the control signal exceeds the limit value, the control circuit adjusts the control signal to adjust the operating signal output by the conversion circuit or directly controls the conversion circuit to stop outputting the operating signal, so that the elements in the power conversion device cannot operate excessively, and the output operating range of the power converter is defined.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A power conversion apparatus, comprising:
the conversion circuit is used for converting a voltage signal into an operation signal and adjusting an operation voltage value and an operation frequency of the operation signal according to a control signal;
a filter circuit electrically connected to the converting circuit for generating a working current according to the operation signal;
a measuring circuit electrically connected to the filter circuit for measuring the magnitude of the working current; and
a control circuit, electrically connected to the measurement circuit and the conversion circuit, for adjusting the control signal or controlling the conversion circuit to stop converting the voltage signal according to the magnitude of the working current when the product of the operating frequency of the operating signal and the operating voltage exceeds a limit value;
when the magnitude of the working current reaches the rated current value of the filter circuit, the limit value is set according to the product of the operating frequency of the operating signal and the operating voltage value;
the measuring circuit is electrically connected to two ends of the resistor, the magnitude of the working current is calculated according to a voltage difference value of the two ends of the resistor, and a rated current value of the filter circuit is related to a current range in which the resistor can operate.
2. The power conversion device of claim 1, wherein when the control circuit controls the operating voltage of the operating signal to be at a predetermined voltage and adjusts the operating frequency of the operating signal to make the magnitude of the operating current reach the rated current of the filter circuit, the product of the predetermined voltage and the operating frequency is the limit value.
3. The power conversion device of claim 1, wherein when the control circuit controls the operating frequency of the operating signal to be at a predetermined frequency and adjusts the operating voltage of the operating signal such that the magnitude of the operating current reaches the rated current value of the filter circuit, the product of the predetermined frequency and the operating voltage is the limit value.
4. The power conversion device of claim 1, wherein when a product of the operating frequency and the operating voltage of the operating signal exceeds the limit value, the control circuit determines a proportional relationship between the operating frequency and the operating voltage according to the magnitude of the operating current, and adjusts the control signal according to the limit value and the proportional relationship.
5. A method for controlling a power conversion apparatus, comprising:
converting a voltage signal into an operation signal;
adjusting an operation voltage value and an operation frequency of the operation signal according to a control signal;
the operation signal generates a working current through a filter circuit;
measuring the magnitude of the working current; and
when the product of the operating frequency and the operating voltage value of the operating signal exceeds a limit value, adjusting the control signal or stopping converting the voltage signal into the operating signal according to the magnitude of the working current;
when the magnitude of the working current reaches the rated current value of the filter circuit, the limit value is set according to the product of the operating frequency of the operating signal and the operating voltage value;
the step of measuring the magnitude of the working current comprises measuring a voltage difference value between two ends of the resistor, and calculating the magnitude of the working current according to the voltage difference value between the two ends of the resistor, wherein the rated current value of the filter circuit is related to the operable current range of the resistor.
6. The method as claimed in claim 5, further comprising setting the operating voltage of the operating signal at a predetermined voltage, adjusting the operating frequency of the operating signal to make the operating current reach a rated current of the filter circuit, and setting the limit value according to a product of the predetermined voltage and the operating frequency.
7. The method as claimed in claim 5, further comprising setting the operating frequency of the operating signal at a predetermined frequency, adjusting the operating voltage of the operating signal to make the operating current reach a rated current of the filter circuit, and setting the limit value according to a product of the predetermined frequency and the operating voltage.
8. The method as claimed in claim 5, wherein the step of adjusting the control signal according to the magnitude of the operating current comprises determining a proportional relationship between the operating frequency and the operating voltage according to the magnitude of the operating current, and adjusting the control signal according to the limit value and the proportional relationship.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611238101.8A CN108258892B (en) | 2016-12-28 | 2016-12-28 | Power conversion device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611238101.8A CN108258892B (en) | 2016-12-28 | 2016-12-28 | Power conversion device and control method thereof |
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| CN108258892A CN108258892A (en) | 2018-07-06 |
| CN108258892B true CN108258892B (en) | 2020-02-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004129483A (en) * | 2002-08-08 | 2004-04-22 | Canon Inc | Power converter and generator |
| US7310214B2 (en) * | 2004-05-27 | 2007-12-18 | Harris Corporation | Inductive output tube (IOT) control circuit |
| TWI410037B (en) * | 2008-12-08 | 2013-09-21 | Ind Tech Res Inst | Power conversion device and control method thereof |
| CN102468752B (en) * | 2010-11-15 | 2015-10-28 | 华润矽威科技（上海）有限公司 | The switching power circuit that the pulse frequency modulated with output voltage compensation controls |
| US8896284B2 (en) * | 2011-06-28 | 2014-11-25 | Texas Instruments Incorporated | DC-DC converter using internal ripple with the DCM function |
| CN103414210B (en) * | 2013-07-31 | 2016-12-28 | 广西大学 | A kind of photovoltaic grid-connected device based on SOPC |
| CN103441526B (en) * | 2013-08-14 | 2015-04-01 | 华北电力大学（保定） | Grid-connected off-grid small photovoltaic power generation system and control method |
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