KR20200072183A - Reduction of switching noise of converter apparatus including a plurality of converter modules operating in parallel - Google Patents

Abstract

According to an aspect of the present invention, provided is a converter device which comprises: multiple converter modules connected and operated in parallel to each other; and a controller controlling operation of the multiple converter modules. Each of the multiple converter modules adjusts the amount of power to be processed through on/off operation of a switching element included therein, and the controller controls the converter module so that a difference of switching noise generated by the on/off operation of the switching element in each of the multiple converter modules is reduced. According to the present invention, a problem caused by the switching noise can be alleviated by reducing a maximum value of the switching noise by equalizing a size of the switching noise generated in each converter module.

Description

REDUCTION OF SWITCHING NOISE OF CONVERTER APPARATUS INCLUDING A PLURALITY OF CONVERTER MODULES OPERATING IN PARALLEL}

The present invention relates to a converter device. Specifically, the present invention relates to reducing switching noise of a converter device including a plurality of converter modules operating in parallel.

A converter device including a plurality of converter modules operating in parallel has been widely used. A converter device in which a plurality of converter modules operate in parallel has various advantages such as increased efficiency, increased redundancy, and ease of expansion due to module configuration.

The converter module generates switching noise by the on/off operation of the switching element included therein, but the size of the switching noise is affected by parasitic components, so even if it is a converter module that is designed identically and processes the same power The noise level may be different.

From the viewpoint of switching noise, there is a point to be careful when designing a converter device in which a plurality of converter modules operate in parallel. A converter device including a plurality of converter modules generally operates such that the plurality of converter modules uniformly share the total power required by the load. In this case, each converter module processes the same power (eg, the same current), but the size of the switching noise may be different due to differences in parasitic components of each converter module.

When the switching noise is increased, it becomes difficult to meet the Electro-Magnetic Interference (EMI) standard. In addition, when the voltage stress applied to the element inside the converter module increases due to the switching noise, a problem that the element is destroyed may occur. When switching noises of different sizes occur in a plurality of converter modules, the largest switching noise mainly affects the characteristics of EMI or voltage stress, so the size of the switching noise generated in each converter module is equalized to reduce the switching noise. It is desirable to reduce the maximum value of.

The object of the present invention is to reduce switching noise in a converter device including a plurality of converter modules operating in parallel (evenly reduce the maximum value of switching noise by equalizing the size of the switching noise generated in each converter module).

One aspect of the present invention, a plurality of converter modules operating in parallel with each other to operate; Includes; a controller for controlling the operation of the plurality of converter modules, each of the plurality of converter modules controls the amount of power to be processed through the on/off operation of the switching element included therein, the controller It is a converter device characterized by controlling the converter module to reduce the difference in switching noise caused by the on/off operation of the switching element in each of the plurality of converter modules.

In the converter device, the controller may adjust the amount of power processed by each converter module according to the size of the switching noise generated in each of the plurality of converter modules.

In the converter device, the magnitude of the switching noise may be a peak voltage of the switching noise.

In the converter device, the controller detects a voltage of a node (switching node) whose voltage changes rapidly by on/off of the switching element in each of the plurality of converter modules and detects the voltage of each of the plurality of converter modules. For the size information of the switching noise can be generated.

In the converter device, when the switching element is a P type, a node connected to a source terminal or an emitter terminal of the switching element is used as the switching node, and when the switching element is an N type, a drain terminal or collector of the switching element A node connected to the terminal can be used as the switching node.

In the converter device, the controller reduces a high frequency component exceeding a switching frequency included in the switching noise for each of the plurality of converter modules by using a peak detection circuit, detects the peak contour of the switching noise, and switches the Size information of the switching noise may be generated using a peak contour line of noise.

In the converter device, the peak detection circuit includes a diode, a capacitor, and a resistor, and a high frequency component of the switching noise can be reduced by using a time constant of the capacitor and the resistor.

In the converter device, the controller performs frequency analysis on the peak contour of the switching noise for each of the plurality of converter modules to extract the switching frequency component of the switching noise, and extracts the switching frequency component of the switching noise. Size information of the switching noise can be generated by using the method.

In the converter device, the controller may subtract the output voltage of the converter module from the peak contour of the switching noise and perform the frequency analysis before performing the frequency analysis of the switching noise.

In the converter device, the controller calculates variance by using the size information of the switching noise of each of the plurality of converter modules, and the power processed by each of the plurality of converter modules to minimize the calculated variance. You can adjust the amount.

In the converter device, the controller controls the amount of power processed by each converter module according to the size of the switching noise, and each converter module is processed by changing a current reference value for current control of each converter module The amount of current to be controlled can be adjusted.

In the converter device, the current reference value may correspond to the current of the inductor included in each converter module.

In one aspect of the present invention, a controller for controlling a converter device including a plurality of converter modules operating in parallel with each other, the controller comprising: a switching noise detection unit for detecting switching noise occurring in each of the plurality of converter modules; A switching noise analysis unit analyzing the size of the switching noise generated in each of the plurality of converter modules; And a converter module control unit that controls the amount of power processed by each converter module according to the size of the switching noise generated in each of the plurality of converter modules.

In the controller, the switching noise detection unit may detect a voltage of a node (switching node) whose voltage is rapidly changed by on/off of a switching element included in each of the plurality of converter modules.

In the controller, the switching noise analysis unit uses a peak detection circuit to reduce high-frequency components exceeding the switching frequency included in the switching noise for each of the plurality of converter modules and detect the peak contour of the switching noise, Size information of the switching noise may be generated using the peak contour of the switching noise.

In the controller, the peak detection circuit includes a diode, a capacitor, and a resistor, and a high frequency component of the switching noise can be reduced by using a time constant of the capacitor and the resistor.

In the controller, the switching noise analysis unit performs frequency analysis on the peak contour of the switching noise for each of the plurality of converter modules to extract the switching frequency component of the switching noise, and the switching frequency component of the switching noise Size information of the switching noise may be generated using.

In the controller, the converter module control unit calculates variance using size information of the switching noise of each of the plurality of converter modules, and processes each of the plurality of converter modules so that the calculated variance is minimized. The amount of power can be adjusted.

In one aspect of the present invention, in a method of operating a converter device including a plurality of converter modules connected in parallel to each other and a controller for controlling the operation of the plurality of converter modules, each of the plurality of converter modules is generated. A switching noise detection step of detecting a switching noise; A switching noise analysis step of analyzing the size of the switching noise generated in each of the plurality of converter modules; And a converter module control step of controlling the amount of power processed by each converter module according to the size of the switching noise generated in each of the plurality of converter modules.

In the operation method, the switching noise analysis step reduces a high-frequency component exceeding a switching frequency included in the switching noise for each of the plurality of converter modules using a peak detection circuit and reduces the peak contour of the switching noise. Extracting, and generating the size information of the switching noise using the peak contour of the switching noise.

In the operation method, the size information of the switching noise is performed by frequency analysis on a peak contour line of the switching noise for each of the plurality of converter modules to extract the switching frequency component of the switching noise, and the switching noise It can be generated using the switching frequency component of.

According to the present invention, switching noise can be reduced in a converter device including a plurality of converter modules operating in parallel. Specifically, according to the present invention, it is possible to alleviate problems caused by switching noise by uniformizing the size of the switching noise generated in each converter module and reducing the maximum value of the switching noise.

1 is an example of a typical converter device including a plurality of converter modules operating in parallel.
2 shows parasitic components together as an example of a power circuit used inside a converter module.
3 illustrates switching noise occurring in one converter module.
4 illustrates switching noise occurring in two converter modules.
5 illustrates a state in which switching noises generated in two converter modules are uniform according to an embodiment of the present invention.
6 illustrates a converter device according to an embodiment of the present invention.
7 illustrates a power circuit inside the converter module.
8 illustrates a controller according to an embodiment of the present invention.
9 and 10 illustrate a switching noise analysis unit according to an embodiment of the present invention.
11 illustrates a peak detection circuit according to an embodiment of the present invention.
12 illustrates an operation of extracting a peak contour line of switching noise from a peak detection circuit.
13 is a block diagram illustrating the interior of a converter module according to an embodiment of the present invention.
14 illustrates an operation method of a converter device according to an embodiment of the present invention.
15 specifically illustrates the switching noise analysis step of FIG. 14.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. It should be noted that in adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in describing the present invention, when it is determined that detailed descriptions of related well-known structures or functions may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, the component may be directly connected to or connected to the other component, but another component between each component It will be understood that elements may be "connected", "coupled" or "connected".

1 is an example of a general converter device 10 including a plurality of converter modules (20_1 ~ 20_n) operating in parallel.

Referring to FIG. 1, a plurality of converter modules 20_1 to 20_n included in the converter device 10 may operate in parallel with each other. That the plurality of converter modules 20_1 to 20_n are connected in parallel with each other, for example, the plurality of converter modules 20_1 to 20_n share the input voltage Vi with each other and/or the output voltage Vo. Can mean The plurality of converter modules 20_1 to 20_n connected in parallel may share and process the total power (or current) processed by the converter device 10. In general, the plurality of converter modules 20_1 to 20_n connected in parallel can equally share the total power processed by the converter device 10.

FIG. 2 shows parasitic components together as an example of a power circuit 21 that can be used inside the converter modules 20_1 to 20_n of FIG. 1.

Referring to FIG. 2, the power circuit 21 uses a boost circuit including an inductor L, a switching element (including M, a diode DM connected in parallel), a diode D, and an output capacitor Co. It is illustrated as being. The other two parasitic inductors (L1_p, L2_p), two parasitic capacitors (C1_p, C2_p), and two parasitic resistors (R1_p, R2_p) all illustrate parasitic components. The parasitic component is not an intended component at the time of design, but may exist inside the device, the substrate or the wiring, and various parasitic components may be present in addition to the parasitic component illustrated in FIG.

The power circuit 21 charges and discharges the energy of the inductor L by the on/off switching operation of the switching element M (that is, increases or decreases the inductor current) while output voltage Vo or output current (not shown) Can be adjusted. For example, as the on period of the switching element M is relatively larger than the off period, the output voltage Vo may be increased. The power circuit 21 of a method of converting power by on/off switching of the switching element M is also referred to as a switching converter.

When the switching element M inside the power circuit 21 performs an on/off operation, switching noise may occur. For example, the switching noise may occur when the switching element M switches the on/off state, and may occur most particularly when the switching element M switches from the on state to the off state.

A situation in which switching noise occurs is exemplarily described. In FIG. 2, when the switching element M is on, the current flowing through the switching element M also flows in the same manner to the parasitic inductor L1_p connected in series to the switching element M. When the switching element M is switched from the on state to the off state, the current of the parasitic inductor L1_p can no longer flow through the switching element M, and thus flows through the parasitic capacitor C1_p. The resonance of the parasitic inductor L1_p and the parasitic capacitor C1_p induced in this way is influenced by other parasitic components L2_p, R1_p, C2_p, R2_p and lasts for a predetermined period. When the switching element M is switched off, resonance (switching noise) due to the parasitic components may continue until the energy stored in the parasitic inductor L1_p is exhausted by the parasitic resistors R1_p and R2_p. It should be understood that the occurrence of the switching noise described so far is only an example and is a simplified description. The switching noise referred to in this specification is not limited only to occur in the same manner as described above.

3 illustrates switching noise generated in the power circuit 21 of FIG. 2.

Hereinafter, it will be described with reference to FIGS. 2 and 3. The waveform 301 in FIG. 3 illustrates the switching node voltage Vsn. The switching node voltage Vsn may be, for example, a voltage of a node whose voltage is rapidly changed by a switching operation of the switching element M. For example, it may be the voltage of the node indicated by SN in FIG. 2.

When the switching element M is switched from the ON state to the OFF state, the switching node voltage Vsn is elapsed some time after a sudden rise accompanied by the switching noise 302 (when the normal state is reached) ) It can be converged to a predetermined voltage (Vo). That is, by the switching noise 302, the switching node SN may take a much larger voltage Vp than the voltage Vo expected at the time of design. The switching noise 302 may cause EMI, but the large voltage stress Vp caused by the switching noise 302 may cause device destruction.

4 illustrates switching noise occurring in two converter modules.

In FIG. 4, the first waveform is the inductor current (I1) of the first converter module, the second waveform is the inductor current (I2) of the second converter module, and the third waveform is the switching node voltage (Vsn1) of the first converter module, yes The second waveform illustrates the switching node voltage Vsn2 of the second converter module.

4, it is assumed that two converter modules process the same power. That is, it is assumed that the average value Iavg of the inductor current I1 of the first converter module and the average value Iavg of the inductor current I2 of the second converter module are the same. Although the powers processed by the two converter modules are the same, as described above, the size of the switching noise and the second converter generated in the switching node voltage Vsn1 of the first converter module due to the difference in parasitic components of each converter module. The magnitude of the switching noise generated in the switching node voltage Vsn2 of the module may be different. Therefore, the peak value Vp1 of the switching node voltage Vsn1 of the first converter module may be different from the peak value Vp2 of the switching node voltage Vsn2 of the second converter module. In this case, the second converter module having a small peak value (Vp2) of the switching node voltage has no problem, but the first converter module having a large peak value (Vp1) of the switching node voltage may cause problems of EMI and device destruction. . Therefore, it is necessary to reduce the switching noise of the converter module in which the switching noise is greatly generated.

5 illustrates a waveform in which switching noise generated in two converter modules is uniform according to an embodiment of the present invention. 5 is a view conceptually explaining a principle of reducing switching noise by equalizing switching noise generated in two converter modules.

Referring to FIG. 5, the first waveform shows the inductor current I1' of the first converter module and the inductor current I2' of the second converter module together, and the second waveform shows the switching node of the first converter module. The voltage Vsn1' and the third waveform illustrate the switching node voltage Vsn2' of the second converter module.

As can be seen from the first waveform, in this embodiment, the magnitudes of the inductor current I1' of the first converter module and the inductor current I2' of the second converter module may be different. That is, the amount of power processed by the first converter module and the second converter module may be different.

As illustrated in FIG. 4, when the first converter module and the second converter module process the same power, the switching node voltage Vsn1 of the first converter module is greater than the switching node voltage Vsn2 of the second converter module. It is assumed that a switching noise occurs. In this embodiment, by setting the inductor current I1' of the first converter module to be smaller than the inductor current I2' of the second converter module, the switching node voltage Vsn1' and the second converter of the first converter module are set. A switching noise of the same or similar size may be generated in the switching node voltage Vsn2' of the module. According to this method, the peak value Vp1' of the switching node voltage Vsn1' of the first converter module and the peak value Vp2' of the switching node voltage Vsn2' of the second converter module may be the same or similar. Can be. That is, the size of the switching noise generated in the two converter modules can be made uniform by varying the amount of power processed by the two converter modules.

As described with reference to FIG. 2, since the size of the switching noise is influenced by the amount of energy stored in the parasitic components at the time when the on/off state of the switching element M changes, the converter module processes it. By reducing the power (eg, inductor current), switching noise generated in the corresponding converter module can be reduced.

As described above, this embodiment detects the magnitude of the switching noise generated in the plurality of converter modules and adjusts the amount of power (eg, the amount of current) processed according to the size of the switching noise to generate the plurality of converter modules. It is intended to alleviate the problems caused by switching noise by reducing the difference in switching noise. Below, a specific method for implementing the technical idea of this embodiment is illustrated.

6 illustrates a converter device 100 according to an embodiment of the present invention.

Referring to FIG. 6, the converter device 100 may include a plurality of converter modules 110_1 to 110_n and a controller 120.

The converter device 100 may convert the form or size of power between the input voltage Vi and the output voltage Vo. The converter device 100 receives power from the input voltage Vi and delivers the power to the output voltage Vo as well as a unidirectional function, and receives power from the output voltage Vo and transmits to the input voltage Vi or in both directions. Can deliver power. That is, the input voltage (Vi) and the output voltage (Vo) are only named according to the conventional power transmission direction, and thus, the type of the converter device 100 is not limited.

The plurality of converter modules 110_1 to 110_n may be operated in parallel with each other. Each of the plurality of converter modules 110_1 to 110_n may control the amount of power processed through an on/off operation of a switching element included therein. When the plurality of converter modules 110_1 to 110_n are connected in parallel with each other, for example, the plurality of converter modules 110_1 to 110_n share the input voltage Vi with each other and/or the output voltage Vo. Can mean The plurality of converter modules 110_1 to 110_n connected in parallel may share and process the total power (or current) processed by the converter device 100.

The controller 120 may control operations of the plurality of converter modules 110_1 to 110_n. For example, the controller 120 controls the plurality of converter modules 110_1 to 110_n to reduce the difference in switching noise caused by the on/off operation of the switching element in each of the plurality of converter modules 110_1 to 110_n. Can be. For example, the controller 120 may adjust the amount of power processed by each converter module 110_1 to 110_n according to the size of the switching noise generated in each of the plurality of converter modules 110_1 to 110_n.

As an example of a method in which the controller 120 controls the amount of power processed by each converter module 110_1 to 110_n according to the size of the switching noise, the controller 120 controls the current of each converter module 110_1 to 110_n The size of the current processed by each converter module 110_1 to 110_n can be adjusted by changing the current reference value for the. For example, the current reference value may correspond to the current of the inductor included in each converter module or the current of the switching element.

To this end, the controller 120 receives a sensing signal SS that detects a switching node voltage from a sensor, undergoes internal processing, generates a converter module control signal CM, and generates a plurality of converter modules ( 110_1 ~ 110_n). The controller 120 may provide different power reference value (or current reference value) information to each converter module 110_1 to 110_n through the converter module control signal CM. As described above, each of the plurality of converter modules 110_1 to 110_n adjusts the amount of power processed therein differently in response to the converter module control signal CM received from the controller 120, as described above. The difference in switching noise occurring in each of the converter modules 110_1 to 110_n may be reduced.

For example, the magnitude of the switching noise may be a peak voltage of the switching noise (Vp1', Vp2' in FIG. 5) and/or a switching frequency component included in the switching noise as a factor.

7 illustrates the power circuit 111 inside the converter module. The converter module may further include a configuration for controlling the power circuit 111 in addition to the power circuit 111.

Referring to FIG. 7, a boost circuit including an inductor L, a switching element (including M, a diode DM connected in parallel), a diode D, and an output capacitor Co is used in the power circuit 111. It is illustrated as being. Various circuits such as a buck, a buck-boost, a flyback, a forward, and a bridge circuit may be used in the power circuit 111 as well as a boost circuit. This embodiment does not limit the type of circuit used in the power circuit 21.

The power circuit 111 may be a switching converter that controls the output voltage Vo or the output current (not shown) while charging and discharging the energy of the inductor L by the on/off switching operation of the switching element M. . For example, the output voltage Vo or the output current may be controlled by a duty control method for adjusting the ratio of the on period and the off period of the switching element M.

In the power circuit 111, a switching node SN, which is a node in which the voltage rapidly changes due to the on/off operation of the switching element M, may be present. In the circuit of FIG. 7, the node connected to the drain terminal of the switching element M is illustrated as the switching node SN, but if the circuit of the power circuit 111 is changed, the position of the switching node SN may also be changed. . For example, when the switching element is a P type, a node connected to a source terminal or an emitter terminal of the switching element may be used as a switching node, and when the switching element is an N type, drain of the switching element ) A node connected to a terminal or a collector terminal can be used as a switching node. As described above, the controller (120 of FIG. 6) may detect the voltage of the switching node SN inside each of the plurality of converter modules and generate size information of the switching noise for each of the plurality of converter modules.

8 illustrates a controller 120 according to one embodiment of the present invention.

Referring to FIG. 8, the controller 120 may include a switching noise detection unit 121, a switching noise analysis unit 122 and a converter module control unit 123.

The controller 120 may control a converter device including a plurality of converter modules operating in parallel with each other. For example, the controller 120 may control the plurality of converter modules to reduce the difference in switching noise caused by the on/off operation of the switching element in each of the plurality of converter modules.

The switching noise detection unit 121 may detect switching noise occurring in each of the plurality of converter modules. For example, the switching noise detector 121 may detect the voltage of the switching node, which is a node in which the voltage is rapidly changed by on/off of the switching element included in each of the plurality of converter modules. To this end, for example, the switching noise detection unit 121 may receive the sensing signal SS sensing the voltage of the switching frequency from the sensor and output the switching noise signal NS. For example, the switching noise detection unit 121 may receive a sensing signal SS from a sensor and perform functions such as amplification, buffering, etc. Without it, you can perform only the interface function with the sensor.

A sensor is a device capable of sensing switching noise generated in each of a plurality of converter modules. A general sensor used for voltage sensing may be used as the sensor.

The switching noise analysis unit 122 may analyze the size of the switching noise generated in each of the plurality of converter modules.

For example, the switching noise analysis unit 122 uses a peak detection circuit to reduce high frequency components exceeding the switching frequency included in the switching noise for each of the plurality of converter modules, extract the peak contour of the switching noise, and extract the peak The size of the switching noise can be generated using the contour.

For example, the switching noise analysis unit 122 extracts the switching frequency component of the switching noise by performing frequency analysis on the extracted peak contour, and uses the extracted switching frequency component of the switching noise to obtain size information of the switching noise. Can be created.

For example, the switching noise analysis unit 122 extracts the peak voltage of the switching node voltage (for example, Vp in FIG. 3) and generates size information of the switching noise using the extracted peak voltage of the switching node voltage. Can be.

For example, the switching noise analysis unit 122 may generate the size information of the switching noise by using the switching frequency component and the peak voltage of the switching noise together.

The switching noise analysis unit 122 may additionally combine the aforementioned parameters differently or generate size information of the switching noise using other parameters not mentioned.

The switching noise analysis unit 122 converts the switching noise size signal (NA) including information about the size of the switching noise after receiving the switching noise signal NS from the switching noise detection unit 121 and performing the above-described processing. It can be provided to the module control unit 123.

The switching noise analysis unit 122 will be described in more detail below.

The converter module control unit 123 may adjust the amount of power processed by each converter module according to the size of the switching noise generated in each of the plurality of converter modules. For example, the converter module control unit 123 compares the sizes of switching noises generated in each of the plurality of converter modules, and the power processed by each converter module so that the sizes of the switching noises of the plurality of converter modules are uniform (same or similar). You can adjust the amount. For example, the converter module control unit 123 calculates variance using the size information of each switching noise of the plurality of converter modules, and calculates the amount of power each of the plurality of converter modules processes so that the calculated variance is minimized. Can be adjusted. To this end, the converter module control unit 123 may receive a switching noise magnitude signal NA from the switching noise analysis unit 122 and provide a converter module control signal CM to each converter module.

9 and 10 illustrate the switching noise analysis unit 122, 1022 according to an embodiment of the present invention.

First, it will be described with reference to FIG. 9. The switching noise analysis unit 122 may be formed to analyze switching noise of each of a plurality of converter modules. A portion of the switching noise analysis unit 122 corresponding to each converter module may include a peak detection circuit 122a, a limiter 122b, and a frequency component analysis unit 122c, respectively.

The peak detection circuit 122a receives the switching noise signal NSi for each of the plurality of converter modules, reduces high-frequency components exceeding the switching frequency included in the switching noise signal NSi, and reduces the peak of the switching noise signal NSi. The first switching noise contour signal NEi may be generated by extracting the contour. Here,'i' indicated on the switching noise signal NSi and the switching noise contour signal NEi means a signal corresponding to the i-th converter module.

The peak detection circuit 122a will be described in more detail with reference to FIGS. 11 and 12. The peak detection circuit 122a may include a diode Dp, a capacitor Cp, and a resistor Rp. The peak detection circuit 122a may receive the switching noise signal NSi and output a first switching noise contour signal NEi. The peak detection circuit 122a may be provided corresponding to each of the plurality of converter modules, and FIG. 11 illustrates a circuit formed corresponding to the i-th converter module.

The diode Dp conducts when the voltage of the switching noise signal NSi is higher than the voltage of the capacitor Cp, so that the capacitor Cp is charged, so that the voltage of the capacitor Cp is rapidly changed according to the switching noise signal NSi. It can operate to ascend. When the diode Dp is not conducting (i.e., when the voltage of the switching noise signal NSi is lower than the voltage of the capacitor Cp), the energy charged in the capacitor Cp is equal to that of the capacitor Cp and the resistor Rp. It is discharged through the resistor Rp at a rate determined according to the time constant. That is, the voltage of the capacitor Cp rises rapidly through the diode Dp when the voltage of the switching noise signal NSi is high, and when the voltage of the switching noise signal NSi is low, the capacitor Cp and the resistance Rp D) at a rate corresponding to the time constant.

According to this operating principle, as illustrated in FIG. 12, the peak detection circuit 122a may generate a first switching noise contour signal NEi connecting the peaks of the switching noise signal NSi. For example, the peak detection circuit 122a is provided with a switching noise signal NSi in the form of a waveform 1201, and can generate a first switching noise contour signal NEi in the form of a waveform 1202. have. The portion indicated by the ellipse 1204 in the waveform 1202 may be understood as a peak outline in the form of connecting a peak voltage that repeats at a high frequency in the switching noise 1203 resonating at a higher frequency than the switching frequency fs. . At this time, by properly determining the time constants of the capacitor Cp and the resistor Rp of the peak detection circuit 122a, the first switching noise contour signal NEi can be well followed the contour of the peak voltage of the switching noise. . That is, the peak detection circuit 122a is a high-frequency component of the switching noise (higher than the switching frequency fs) by using the time constants of the capacitor Cp and the resistor Rp, which is understood as the resonance frequency of the parasitic components. Can be reduced) and information about the peak voltage of the switching noise can be extracted.

Referring again to FIG. 9, the limiter 122b designates a range of an upper limit and/or a lower limit of the first switching noise contour signal NEi received from the peak detection circuit 122a, removes the signal outside the range, and removes the signal. It is possible to provide a 2 switching noise contour signal (NEi'). For example, the limiter 122b removes a signal in the voltage range that does not significantly affect the analysis of the switching noise among the first switching noise contour signal NEi, and only the signal in the voltage range that affects the analysis of the switching noise is rear end The accuracy of the switching noise analysis can be improved by transmitting to. The limiter 122b may be omitted depending on the situation.

The frequency component analysis unit 122c may perform component analysis for each frequency of the peak contour of the switching noise for each of the plurality of converter modules to extract the switching frequency component of the switching noise. The switching frequency component of the extracted switching noise may be used as size information of the switching noise. To this end, the frequency component analysis unit 122c is provided with a second switching noise contour signal NEi' from the limiter 122b, performs frequency component analysis, and generates a switching noise magnitude signal NAi to the converter module control unit. Can provide. FFT (Fast Fourier Transform) may be used as an example of frequency component analysis, but other frequency analysis methods may also be used.

10 illustrates a switching noise analysis unit 1022 according to an embodiment different from FIG. 9.

FIG. 10 is different from FIG. 9 in that the first switching noise contour signal NEi output by the peak detection circuit 122a can be corrected using the output voltage Vo. As described above with reference to FIG. 3, the switching node voltage Vsn may include information about the output voltage Vo as well as the switching noise. Therefore, if the information on the output voltage Voi is reduced in the first switching noise contour signal NEi output from the peak detection circuit 122a, a more accurate analysis of the switching noise is possible. For this reason, in FIG. 10, after removing unnecessary noise components through the low-pass filter LPF with respect to the output voltage Voi, the output voltage Voi from the first switching noise contour signal NEi output by the peak detection circuit 122a ) Can be used. That is, the accuracy of the switching noise analysis can be improved by subtracting the output voltage (Vo) of the converter module from the peak contour of the switching noise and performing the frequency analysis before performing the frequency analysis of the switching noise. In FIG. 10, it is illustrated as subtraction using the output voltage Vo, but other voltages may be used. Which voltage to use can be determined by taking into account which voltage the switching node voltage is affected in addition to the switching noise. In addition, in FIG. 10, it is assumed that output voltages (Vo1 to Von) corresponding to each converter module are different, but when a plurality of converter modules share the output voltage (Vo), output voltages corresponding to each converter module ( Since Vo) can be considered to be the same, in this case, one output voltage (Vo) information can be commonly used for a plurality of converter modules.

13 is a block diagram illustrating the interior of a converter module 1310 according to an embodiment of the present invention.

Referring to FIG. 13, the converter module 1310 may include a power circuit 1311 and a current controller 1312. The converter module 1310 may correspond to the converter modules 110_1 to 110_n illustrated in FIG. 6.

The power circuit 1311 may convert the form or size of power between the input voltage Vi and the output voltage Vo. To this end, the power circuit 1311 may include at least some of power elements such as switching elements, diodes, inductors, and capacitors. An example of the power circuit 1311 may be the boost circuit illustrated in FIG. 7. The contents described through FIG. 7 may be applied to the power circuit 1311.

The current controller 1312 may adjust the current of the power circuit 1311 (eg, an inductor current or an output terminal current). The current controller 1312 may adjust the power processed by the power circuit 1311 by adjusting the current of the power circuit 1311.

To this end, the current controller 1312 may receive current I information from the power circuit 1311. Also, the current controller 1312 may receive the converter module control signal CM from the controller (120 of FIG. 6). The current controller 1312 compares the current reference value Iref included in the converter module control signal CM received from the controller (120 in FIG. 6) with the current I received from the power circuit 1311 while comparing the power circuit ( It is possible to control the current I received from 1311 to follow the current reference value Iref. To this end, the current controller 1312 compares the current reference value (Iref) included in the converter module control signal (CM) with the current (I) received from the power circuit (1311) based on the result of comparing the power circuit (1311). A control signal SC for controlling can be output. For example, the control signal SC may be a signal for adjusting on/off of a switching element included in the power circuit 1311.

For example, the controller 120 may include a voltage controller commonly used in all converter modules. The voltage controller may compare common output voltage (Vo) information of all converter modules with a voltage reference value, and generate an overall current reference value corresponding to all converter modules based on the comparison result. That is, the voltage controller increases the total current reference value when the output voltage Vo is lower than the voltage reference value, and decreases the total current reference value when the output voltage Vo is larger than the voltage reference value. Vo) can generate an entire current reference value suitable for accurately following the voltage reference value. In the process of distributing the total current reference value generated by the voltage controller to each converter module, the controller 120 sets the current reference value (Iref) of each converter module differently to reduce the difference in switching noise of each converter module and converts each converter module. Can be provided as

As such, the controller 120 converts the current of the power circuit 1311 based on the converter module control signal CM received by the current controller 1312 inside the converter module 1310 from the controller 120. It is possible to uniform the switching noise by adjusting the current of the module 1310.

14 illustrates an operation method of a converter device according to an embodiment of the present invention. The operation method of FIG. 14 may be performed by a converter device as described above.

First, a switching noise detection step of detecting switching noise occurring in each of the plurality of converter modules may be performed (S1410). For example, the switching noise detection step S1410 may be performed by the switching noise detection unit 121 described with reference to FIG. 8. The detailed method of the switching noise detection unit 121 performing the switching noise detection step (S1410) may be the same as described with reference to FIGS. 8 to 12.

Next, a switching noise analysis step of analyzing the size of the switching noise occurring in each of the plurality of converter modules may be performed (S1430).

The switching noise analysis step (S1430) may include several steps as illustrated in FIG. 15.

15, the switching noise analysis step (S1430) is a step of extracting the peak contour of the switching noise (S1431), a step of subtracting the output voltage (Vo) from the peak contour of the switching noise (S1433), the output voltage (Vo It may include the step of analyzing the frequency component for the peak contour of the switching noise is subtracted (S1435) and extracting the switching frequency component of the switching noise (S1437).

14 is referenced again. For example, the switching noise analysis step (S1430) may be performed by the switching noise analysis unit 122 described with reference to FIG. 8. The detailed description of the switching noise analysis unit 122 performing the switching noise analysis step S1430 may be applied in the same manner as described with reference to FIGS. 8 to 12.

Next, a converter module control step of controlling the amount of power processed by each converter module may be performed according to the size of the switching noise generated in each of the plurality of converter modules (S1450). For example, the converter module control step (S1450) may be performed by the converter module control unit 123 described with reference to FIG. 8. A detailed method of the converter module control unit 123 performing the converter module control step (S1450) may be the same as described with reference to FIGS. 8 to 12.

As described above, the present invention, in a converter device including a plurality of converter modules operating in parallel, detects the size of the switching noise generated in each converter module and reduces the difference between the switching noise power of each converter (eg , Current) to reduce the maximum value of the switching noise to reduce the problem of device destruction due to EMI or voltage stress caused by the switching noise.

The terms "include", "compose" or "have" as described above mean that the corresponding component can be inherent unless otherwise stated, and do not exclude other components. It should be construed that it may further include other components. All terms, including technical or scientific terms, have the same meaning as generally understood by a person skilled in the art to which the present invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted as being consistent with the meaning in the context of the related art, and are not to be interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present invention.

Claims (21)

A plurality of converter modules operating in parallel with each other;
Includes; a controller for controlling the operation of the plurality of converter modules,
Each of the plurality of converter modules controls the amount of power processed through the on/off operation of the switching element included therein,
And the controller controls the converter module to reduce the difference in switching noise caused by the on/off operation of the switching element in each of the plurality of converter modules. The method according to claim 1,
The controller is a converter device, characterized in that for controlling the amount of power each converter module processes according to the size of the switching noise generated in each of the plurality of converter modules. The method according to claim 2,
The size of the switching noise is a converter device, characterized in that the peak voltage of the switching noise as a factor. The method according to claim 2,
The controller detects a voltage of a node (switching node) in which the voltage rapidly changes by on/off of the switching element in each of the plurality of converter modules, and the size of the switching noise for each of the plurality of converter modules A converter device characterized by generating information. The method according to claim 4,
When the switching element is of type P, a node connected to the source terminal or emitter terminal of the switching element is used as the switching node, and when the switching element is N type, the node connected to the drain terminal or collector terminal of the switching element is the Converter device characterized in that it is used as a switching node. The method according to claim 2,
The controller uses a peak detection circuit to reduce high-frequency components exceeding the switching frequency included in the switching noise for each of the plurality of converter modules, detect the peak contour of the switching noise, and use the peak contour of the switching noise. The converter device, characterized in that to generate the size information of the switching noise. The method according to claim 6,
The peak detection circuit includes a diode, a capacitor, and a resistor, and a converter device, wherein the high frequency component of the switching noise is reduced by using the time constant of the capacitor and the resistor. The method according to claim 6,
The controller performs frequency analysis on the peak contour of the switching noise for each of the plurality of converter modules to extract the switching frequency component of the switching noise, and uses the switching frequency component of the switching noise to determine the switching noise. A converter device characterized in that it generates size information. The method according to claim 8,
And the controller subtracts the output voltage of the converter module from the peak contour of the switching noise and performs the frequency analysis before performing the frequency analysis of the switching noise. The method according to claim 2,
The controller calculates the variance using the size information of the switching noise of each of the plurality of converter modules, and adjusts the amount of power each of the plurality of converter modules processes so that the calculated variance is minimized. Converter device characterized by. The method according to claim 2,
When the controller adjusts the amount of power processed by each converter module according to the size of the switching noise, the current reference value for controlling the current of each converter module is changed to adjust the amount of current processed by each converter module. Converter device characterized in that. The method according to claim 11,
The current reference value is a converter device, characterized in that corresponding to the current of the inductor included in each converter module. In the controller for controlling a converter device comprising a plurality of converter modules that are connected to each other in operation,
A switching noise detector that detects switching noise occurring in each of the plurality of converter modules;
A switching noise analysis unit analyzing the size of the switching noise generated in each of the plurality of converter modules; And
And a converter module control unit that controls the amount of power processed by each converter module according to the size of the switching noise generated in each of the plurality of converter modules. The method according to claim 13,
The switching noise detector detects a voltage of a node (switching node) whose voltage changes rapidly by on/off of a switching element included in each of the plurality of converter modules. The method according to claim 13,
The switching noise analysis unit reduces a high frequency component exceeding a switching frequency included in the switching noise for each of the plurality of converter modules by using a peak detection circuit, detects a peak contour of the switching noise, and detects the peak contour of the switching noise. Using the controller of the converter device, characterized in that for generating the size information of the switching noise. The method according to claim 15,
The peak detection circuit includes a diode, a capacitor, and a resistor, and a controller of a converter device, wherein the high frequency component of the switching noise is reduced by using the time constant of the capacitor and the resistor. The method according to claim 15,
The switching noise analysis unit performs frequency analysis on the peak contour of the switching noise for each of the plurality of converter modules to extract the switching frequency component of the switching noise, and uses the switching frequency component of the switching noise to perform the switching A converter device characterized in that it generates noise size information. The method according to claim 13,
The converter module control unit calculates variance using the size information of the switching noise of each of the plurality of converter modules, and adjusts the amount of power each of the plurality of converter modules processes so that the calculated variance is minimized. The controller of the converter device, characterized in that. In the operation method of the converter device including a plurality of converter modules connected in parallel to each other and a controller for controlling the operation of the plurality of converter modules,
A switching noise detection step of detecting switching noise occurring in each of the plurality of converter modules;
A switching noise analysis step of analyzing the size of the switching noise generated in each of the plurality of converter modules; And
And a converter module control step of controlling the amount of power processed by each converter module according to the size of the switching noise generated in each of the plurality of converter modules. The method according to claim 19,
In the switching noise analysis step, a peak detection circuit is used to reduce a high frequency component exceeding a switching frequency included in the switching noise for each of the plurality of converter modules, extract a peak contour of the switching noise, and extract the switching noise. Method of operating a converter device, characterized in that for generating the size information of the switching noise using the peak contour of the. The method according to claim 20,
For the size information of the switching noise, frequency analysis of the peak contour of the switching noise is performed on each of the plurality of converter modules to extract the switching frequency component of the switching noise, and the switching frequency component of the switching noise is used. Method of operation of the converter device, characterized in that generated by.

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