Apparatus for controlling the power factor correction circuit of a charger for a vehicle battery

Abstract

The present invention relates to a device for controlling a power factor correction circuit of a charger for a vehicle battery configured to correct a power factor of an input alternating current voltage by switching of a switching element. The control device of the power factor correction circuit includes a phase angle detection unit configured to detect phase angle information of the input alternating current voltage, and a frequency determination unit configured to synchronize a period in which a preset frequency variation value is varied by applying the phase angle information to the preset frequency variation value with a period of the input alternating current voltage, and determine a value obtained by applying the synchronized frequency variation value to a preset fundamental frequency value as a switching frequency of the switching element.

Description

Technical Field

[0001] The present invention relates to an apparatus for controlling a power factor correction circuit of a charger for charging a vehicle battery, and more specifically, to an apparatus for controlling a power factor correction circuit in which the switching frequency of a switching element within the power factor correction circuit varies periodically within a predetermined range, and the period of the varying switching frequency is synchronized with the frequency of the input AC voltage, thereby preventing pulsation of the input AC current. Background Technology

[0002] Typically, chargers used to charge vehicle batteries include power factor correction circuitry to improve the power factor. Power factor correction circuitry usually employs a boost converter topology that includes inductors, diodes, and switching elements.

[0003] Traditional power factor correction circuits suffer from the following problem: if the switching frequency of the switching elements within the circuit is fixed, a significant amount of electromagnetic noise may be generated due to narrowband peak components. Research has been conducted on improving electromagnetic performance by varying the switching frequency of the switching elements within a predetermined range and at predetermined intervals, thereby distributing the peak noise components across a predetermined frequency band.

[0004] However, the problem with this method is that if the switching frequency is constant and determined, it will interfere with the input AC voltage frequency, and the input AC current will inevitably pulsate.

[0005] The above description of the background technology is only for the purpose of helping to understand the background of the present invention, and those skilled in the art should not regard it as corresponding to known prior art. Summary of the Invention

[0006] Therefore, one aspect of the present invention aims to provide a control device for a power factor correction circuit, wherein when the switching frequency of the switching element inside the power factor correction circuit changes within a predetermined range at a predetermined period, the period of change of the switching frequency and the period of the input AC voltage are appropriately determined, thereby preventing input AC current pulsation.

[0007] According to one aspect of the present invention, a control device for a power factor correction circuit is provided. The device is configured to correct the power factor of an input AC voltage by switching a switching element. The device includes a phase angle detection unit and a frequency determination unit. The phase angle detection unit is configured to detect phase angle information of the input AC voltage. The frequency determination unit is configured to synchronize the period of the preset frequency change value with the period of the input AC voltage by applying the phase angle information to a preset frequency change value, and to determine the value obtained by applying the synchronized frequency change value to a preset fundamental frequency value as the switching frequency of the switching element.

[0008] In an embodiment of the present invention, the phase angle detection unit can detect the phase angle information of the input AC voltage by utilizing a dq phase-locked loop structure.

[0009] In an embodiment of the present invention, the phase angle detection unit may include: a dq converter, a proportional-integral controller, and an integrator. The dq converter is configured to convert an input AC voltage into a dq voltage. The proportional-integral controller is configured to output an angular velocity value that causes the q-axis voltage of the dq voltage obtained by the dq converter to converge to zero. The integrator is configured to integrate the output of the proportional-integral controller to derive phase angle information.

[0010] In an embodiment of the present invention, the dq converter can convert the input AC voltage and the quadrature component voltage having a 90-degree phase difference with the input AC voltage into a dq voltage.

[0011] In an embodiment of the present invention, the q-axis voltage can represent the error between the phase angle of the input AC voltage and the phase angle information detected by the phase angle detection unit.

[0012] In an embodiment of the present invention, the frequency determination unit may include: a cosine calculation unit, a multiplier, and an adder. The cosine calculation unit is configured to calculate the cosine value of the phase angle information; the multiplier is configured to multiply the cosine value obtained by the cosine calculation unit by a preset frequency change value; and the adder is configured to add the multiplication result of the multiplier to the fundamental frequency value to derive the switching frequency of the switching element.

[0013] In an embodiment of the invention, the frequency determination unit may further include a multiplexer configured to select one of a base frequency value and a switching frequency derived from an adder based on an external control signal.

[0014] The advantage of the control device for this power factor correction circuit is that the switching frequency of the internal switching element of the power factor correction circuit is determined to always follow the cycle of the input AC voltage, so that regardless of the cycle change of the input AC voltage, the pulsation of the input current can be prevented, thereby improving the efficiency of the power factor correction circuit or improving the power factor correction performance.

[0015] The beneficial effects obtained from this invention are not limited to those described above, and those skilled in the art will clearly understand other beneficial effects not mentioned herein. Attached Figure Description

[0016] The features and advantages of the present invention, as described below in conjunction with the accompanying drawings, will become more apparent from the following detailed description, in which:

[0017] Figure 1 and Figure 2 This is a circuit diagram illustrating an example of a power factor correction circuit using a power factor correction circuit control device according to an embodiment of the present invention;

[0018] Figure 3 This is a block diagram of the power factor correction circuit control device according to an embodiment of the present invention;

[0019] Figure 4 This is a more detailed block diagram showing the configuration of the phase angle detection unit of the power factor correction circuit control device according to an embodiment of the present invention;

[0020] Figure 5 This is a graph showing the phase angle detection result of the phase angle detection unit of the power factor correction circuit control device according to an embodiment of the present invention;

[0021] Figure 6 This is a more detailed block diagram showing the configuration of the frequency determination unit of the power factor correction circuit control device according to an embodiment of the present invention;

[0022] Figure 7 and Figure 8 These are graphs showing the period of the input voltage and the period of the switching frequency change, respectively, comparing the power factor correction circuit control device according to an embodiment of the present invention when it does not perform frequency change control and when it performs frequency change control; and

[0023] Figure 9 and Figure 10 The differences in input current quality are shown in comparison between the power factor correction circuit control device according to an embodiment of the present invention when it does not perform frequency change control and when it performs frequency change control. Detailed Implementation

[0024] It should be understood that the term "vehicle" or "of a vehicle" or other similar terms as used herein generally includes motor vehicles, such as passenger vehicles including sport utility vehicles (SUVs), buses, trucks, various commercial vehicles, vessels including various boats and ships, aircraft, etc., and includes hybrid vehicles, electric vehicles, hybrid electric vehicles, hydrogen-powered vehicles, and other alternative fuel vehicles (e.g., vehicles derived from non-fossil fuels). As mentioned herein, a hybrid vehicle is a vehicle with two or more power sources, such as both gasoline power and electric power.

[0025] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” as used herein are also intended to include the plural forms. It will also be further understood that when the terms “comprising” and / or “including” are used in this specification, it indicates the presence of the stated features, values, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, values, steps, operations, elements, components, and / or combinations thereof. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. Throughout this specification, unless explicitly stated otherwise, the word “comprising” and variations such as “including” or “including” will be understood to imply the inclusion of the stated elements, but not to exclude any other elements. Furthermore, the terms “unit,” “device,” “section,” and “module” described in the specification refer to a unit for performing at least one function and operation, and may be implemented by hardware components or software components and combinations thereof.

[0026] Furthermore, the control logic of the present invention can be implemented as a non-volatile computer-readable medium on a computer-readable medium, which contains executable program instructions that are executed by a processor, controller, etc. Examples of computer-readable media include, but are not limited to, ROM, RAM, optical disc (CD)-ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage devices. The computer-readable medium can also be distributed across a network-connected computer system, such that the computer-readable medium is stored and executed in a distributed manner, for example, via a telematics server or a controller area network (CAN).

[0027] In the following, a power factor correction circuit control device according to various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0028] First, examples of power factor correction circuits for power factor correction circuit control devices that apply various embodiments of the present invention will be described.

[0029] Figure 1 and Figure 2 This is a circuit diagram illustrating an example of a power factor correction circuit employing a power factor correction circuit control device according to an embodiment of the present invention. Specifically, Figure 1 The implementation shown is an example of a power factor correction circuit for input three-phase AC power. Figure 2 The implementation shown is an example of a power factor correction circuit for input single-phase AC power. Figure 1 and Figure 2 The power factor correction circuit shown is merely an example to aid in understanding the invention, and the invention is not intended to be construed as such. Figure 1 and Figure 2 The limitations of the circuit structure of the power factor correction circuit shown.

[0030] refer to Figure 1 The power factor correction circuit control device according to an embodiment of the present invention can be used with a power factor correction circuit comprising multiple branches A1, A2, and A3 and multiple inductors L1, L2, and L3. Furthermore, each of the multiple branches A1, A2, and A3 includes two switching elements connected in series (S1-S2 connected in series, S3-S4 connected in series, S5-S6 connected in series), and the multiple branches A1, A2, and A3 are connected in parallel. One end of each of the multiple inductors L1, L2, and L3 is connected to the respective node where the two switching elements included in each of the multiple branches A1, A2, and A3 are interconnected. The controller 100 according to an embodiment of the present invention can control the on / off state of the switching elements.

[0031] The other end of each of the multiple inductors L1, L2 and L3 can be the input terminals 10a, 10b and 10c of the power factor correction circuit, while the nodes that connect the multiple branches A1, A2 and A3 in parallel can be the output terminals 11a and 11b of the power factor correction circuit.

[0032] exist Figure 1 In the implementation scheme shown, the AC voltage V corresponding to one of the three-phase AC voltages can be... ac1 V ac2 and V ac3 A DC voltage V is applied to input terminals 10a, 10b, and 10c respectively, and can be output between output terminals 11a and 11b. dc .

[0033] Although not shown, a connection can be made between output terminals 11a and 11b to form a DC voltage V. dc The capacitor, and can be provided at the rear end of the output terminals 11a and 11b with a configuration to convert the DC voltage (V) of the output terminals 11a and 11b. dc A DC / DC converter converts a voltage to the desired value. In the case of a charger installed in the vehicle, the DC / DC converter is connected to the battery and can convert the DC voltage V... dc The value is converted to the value of the battery charging voltage.

[0034] refer to Figure 2The power factor correction circuit control device according to an embodiment of the present invention can be used to apply a power factor correction circuit that may include multiple branches A1 and A2 and multiple inductors L1 and L2. Each of the multiple branches A1 and A2 includes two switching elements connected in series (S1-S2 connected in series, S3-S4 connected in series). The multiple branches A1 and A2 are connected in parallel. One end of each of the multiple inductors L1 and L2 is connected to the respective node where the two switching elements in each of the multiple branches A1 and A2 are interconnected. The controller 100 according to an embodiment of the present invention can control the on / off state of the switching elements.

[0035] The other end of each of the multiple inductors L1 and L2 can be the input terminals 10a and 10b of the power factor correction circuit, while the nodes that connect the multiple branches A1 and A2 in parallel can be the output terminals 11a and 11b of the power factor correction circuit.

[0036] exist Figure 2 In the illustrated implementation, a single-phase AC voltage V can be applied between AC input terminals 10a and 10b. ac A DC voltage V can be output between output terminals 11a and 11b. dc .

[0037] like Figure 1 The example shown, although not shown, can be connected between output terminals 11a and 11b to form a DC voltage V. dc The capacitor, and a capacitor configured to convert the DC voltage V of the output terminals 11a and 11b at the rear end of the output terminals 11a and 11b into a capacitor, can be provided. dc A DC / DC converter converts the voltage to the desired value. In the case of a charger installed in the vehicle, the DC / DC converter is connected to the battery and can convert the DC voltage V... dc The value is converted to the value of the battery charging voltage.

[0038] Figure 3 This is a block diagram of the power factor correction circuit control device according to an embodiment of the present invention.

[0039] refer to Figure 3 According to an embodiment of the present invention, the power factor correction circuit control device may include: a phase angle detection unit 110, a frequency determination unit 120, and a switch driving unit 130, wherein the phase angle detection unit 110 is configured to detect the input AC voltage V. ac1 V ac2 V ac3 or V acThe phase angle information; the frequency determination unit 120 is configured to apply the detected phase angle information to a preset frequency change value, such that the period of the frequency change value is related to the input AC voltage V. ac1 V ac2 V ac3 or V ac The switching frequency is synchronized with the cycle, and the value obtained by applying the synchronized frequency change value to a preset base frequency value is determined as the switching frequency of the switching elements S1-S6 or S1-S4; the switching drive unit 130 is configured to generate a control signal for determining the on / off state of the switching elements S1-S6 or S1-S4 based on the determined switching frequency. The phase angle detection unit 110, the frequency determination unit 120, and the switching drive unit 130 can be implemented by one or more controllers.

[0040] Figure 4 This is a block diagram showing in more detail the configuration of the phase angle detection unit of the power factor correction circuit control device according to an embodiment of the present invention.

[0041] Phase angle detection unit 110 is mainly used to detect the input AC voltage V. ac1 V ac2 V ac3 or V ac The circuit for detecting the phase angle θ. Methods for detecting the phase angle of an AC signal can employ several techniques known in the relevant technical field, such as detecting the voltage waveform and dividing it by the magnitude of the AC signal, or creating a sine function by detecting the zero-crossing points of the AC signal. Specifically, in embodiments of the present invention, the phase angle detection unit 110 can employ, for example... Figure 4 The dq phase-locked loop (PLL) structure is shown.

[0042] refer to Figure 4 The phase angle detection unit 110, which employs a dq PLL structure, may include a dq converter 111, a proportional-integral (PI) controller 112, and an integrator 113. The dq converter 111 is configured to convert a single-phase or multi-phase input AC voltage into a dq voltage. The proportional-integral (PI) controller 112 is used to output an angular velocity value that causes the q-axis voltage of the dq voltage obtained by the dq converter 111 to converge to zero. The integrator 113 is used to integrate the output of the proportional-integral controller 112 to derive the phase angle.

[0043] Specifically, the dq converter 111 can convert an input AC voltage corresponding to the grid voltage into a dq voltage. When the input AC voltage is a single-phase voltage, the dq converter 111 can generate an orthogonal component with a 90-degree phase difference from the input AC voltage by utilizing delay or the like, and then perform dq conversion on this orthogonal component. When the input AC voltage is a three-phase voltage, the dq converter can generate an AC voltage of one phase of the three phases and an orthogonal component with a 90-degree phase difference from it by utilizing the difference between the phase voltages of the three phases, and then perform dq conversion on this orthogonal component.

[0044] The DQ converter 111 can set a single-phase AC voltage or the voltage of one phase and its orthogonal component with a 90-degree phase difference to voltages V with α and β values, respectively. α and V β Furthermore, it can be dq transformed using the αβ-dq transformation formula known in the relevant technical fields.

[0045] [Equation 1]

[0046]

[0047] In Equation 1, θ can be a value obtained by feeding back the phase angle detected by the phase angle detection unit 110. This is assumed to be the α value voltage V corresponding to a single-phase AC voltage or the voltage of one phase. α for And assume that the voltage V corresponding to the orthogonal component with a 90-degree phase difference is β. β for At that time, the q-axis voltage V q It can be obtained through the following equation 2.

[0048] [Equation 2]

[0049]

[0050] Here, according to the sine and cosine formulas, the right side of equation 2 can be summarized as equation 3 below.

[0051] [Equation 3]

[0052]

[0053] As shown in Equation 3, the phase angle of the q-axis voltage corresponding to the input AC voltage derived through the dq conversion is... The error between the phase angle θ detected by the phase angle detection unit 110 and the phase angle θ detected by the phase angle detection unit 110. This means that if the detected phase angle θ makes the above value zero, the phase angle of the input AC voltage is detected accurately.

[0054] Therefore, the proportional-integral controller 112 can perform proportional-integral control to make the q-axis voltage obtained and output by the dq converter 111 converge to zero, and can output angular velocity information corresponding to the result of proportional-integral control.

[0055] Integrator 113 can integrate the angular velocity information output by proportional-integral controller 112 to derive the phase angle at which the q-axis voltage can converge to zero.

[0056] Furthermore, the phase angle detection unit 110 may additionally include limiters or configurations that perform anti-saturation control to limit the range of values ​​output from the various elements. These additional configurations are not directly related to the main idea of ​​the invention, and these additional configurations can be readily deduced by those skilled in the art within the scope of the present invention; therefore, further detailed description will be omitted.

[0057] Figure 5 This is a graph showing the phase angle detection result of the phase angle detection unit of the power factor correction circuit control device according to an embodiment of the present invention.

[0058] like Figure 5 As shown, the phase angle detection unit 110 of the dq PLL structure described above can detect the phase angle according to the phase change of the input AC voltage. Specifically, in the example above, since the reference α value voltage V... α It is determined in the form of a cosine function, when the input AC voltage has the following characteristics: Figure 5 When the peak value is shown, the phase angle can be identified as 0 degrees (or 360 degrees).

[0059] Figure 6 This is a block diagram showing in more detail the configuration of the frequency determination unit of the power factor correction circuit control device according to an embodiment of the present invention.

[0060] refer to Figure 6 The frequency determination unit 120 may include a cosine calculation unit 121, a multiplier 122, an adder 123, and a multiplexer 124. The cosine calculation unit 121 is configured to calculate the cosine value of the detected phase angle; the multiplier 122 is configured to multiply the cosine value obtained by the cosine calculation unit 121 by a preset frequency change value f. SW_PFC_OnjAmp The adder 123 is configured to multiply the result of the multiplier 122 by a preset fundamental frequency value f. SW_PFC_Base Add; the multiplexer 124 is configured to selectively output the fundamental frequency value f. SW_PFC_Base One of the summation results of adder 123.

[0061] Preset fundamental frequency value f SW_PFC_BaseIt is a value corresponding to the fixed switching frequency of the switching elements in the power factor correction circuit, and can be appropriately predetermined according to system specifications, etc. When frequency spread (variation) control is performed, the fundamental frequency value f... SW_PFC_Base It can be the center frequency of the frequency range.

[0062] Preset frequency change value f SW_PFC_OnjAmp It is used to extend (change) the fundamental frequency value f SW_PFC_Base The width is a preset value, and the switching frequency of the switching element can be set to the base frequency value f. SW_PFC_Base Add the frequency change value or the fundamental frequency value f SW_PFC_Base Variation within the range of subtracting frequency change values.

[0063] For example, if the fundamental frequency value f SW_PFC_Base For 100kHz, the frequency change value f SW_PFC_OnjAmp If the frequency is 5kHz, then the frequency of the switching element in the power factor correction circuit that controls the frequency expansion (change) of the switching element can vary in a predetermined period within the range of 95 to 105kHz.

[0064] According to various embodiments of the present invention, the period of frequency variation of the switching element is synchronized with the mains AC voltage (i.e., the input AC voltage). That is, in the above examples, according to various embodiments of the present invention, the period of the switching frequency of the switching element decreasing from 100 kHz to 95 kHz, increasing to 105 kHz, and then returning to 100 kHz can be synchronized with the input AC voltage.

[0065] Therefore, according to an embodiment of the present invention, the frequency determination unit 120 obtains the cosine value of the phase angle of the input AC voltage detected by the phase angle detection unit 110, and multiplies the cosine value of the phase angle by the frequency change value f. SW_PFC_OnjAmp That is, the output of multiplier 122 can be a cosine function having the magnitude of the frequency change value, and the cosine function can be a function with the same phase as the input AC voltage. In other words, multiplier 122 can change the frequency change value f. SW_PFC_OnjAmp To synchronize with the cycle of the input AC voltage.

[0066] The output of multiplier 122 is multiplied by adder 123 and then by a preset fundamental frequency value f. SW_PFC_Base Adding them together, the switching frequency of the switching element can be determined by the frequency change value f. SW_PFC_OnjAmp It varies within a defined range and in a state synchronized with the period of the input AC voltage.

[0067] Multiplexer 124 can select the base frequency value f based on an external control signal SSFM_On that determines whether to perform frequency variation control. SW_PFC_BaseThe output of the multiplexer 124 is one of the switching frequency values ​​that varies synchronously with the period of the input AC voltage. The output of the multiplexer 124 can be determined as the switching frequency f of the switching elements in the power factor correction circuit. SW_PFC It can also be output to the switch drive unit 130.

[0068] The switch drive unit 130 is configured to operate according to the switching frequency f determined by the frequency determination unit 120. SW_PFC A circuit that generates control signals for switching the switching elements S1-S6 or S1-S4 in a power factor correction circuit on / off. For example, the switch drive unit 130 can be implemented using a known gate drive circuit that generates a signal corresponding to the switching frequency f. SW_PFC The corresponding sawtooth carrier signal generates a DC reference signal for determining the switch duty cycle, and then the on / off control signal is generated by comparing the carrier signal and the reference signal.

[0069] Figure 7 and Figure 8 The graphs show the period of the input voltage and the period of the switching frequency change, respectively, comparing the power factor correction circuit control device according to an embodiment of the present invention when it does not perform frequency change control and when it performs frequency change control. Figure 9 and Figure 10 The differences in input current quality are shown in comparison between the power factor correction circuit control device according to an embodiment of the present invention when it does not perform frequency change control and when it performs frequency change control.

[0070] like Figure 7 As shown, when the power factor correction circuit control device according to the embodiment of the present invention does not perform frequency change control, the frequency change period of the voltage change frequency value remains at a preset value. When the change period of the change frequency value is set to be different from the input AC voltage V... grid When the frequency of the input AC voltage changes, interference occurs between the period of the input AC voltage and the period of the frequency change value, such as... Figure 9 As shown, the input current of the power factor correction circuit exhibits pulsation. Specifically, even if the period of the frequency change value is set to be the same as the period of the input AC voltage change, current pulsation will inevitably occur when the input AC voltage changes periodically during vehicle charging.

[0071] On the other hand, when the power factor correction circuit control device according to an embodiment of the present invention performs frequency variation control, such as Figure 8 As shown, the frequency change period of the voltage change value is determined to always follow the period of the input AC voltage. Therefore, as Figure 10As shown, regardless of the periodic changes in the input AC voltage, the pulsation of the input current can be continuously suppressed, thereby improving the efficiency or power factor correction performance of the power factor correction circuit.

[0072] Although specific embodiments of the invention have been described in the detailed description above, it will be apparent to those skilled in the art that various modifications and alterations can be made to the invention within the scope of the claims.

Claims

1. An apparatus for controlling a power factor correction circuit of a charger for charging a vehicle battery, the apparatus being configured to correct the power factor of an input AC voltage by switching a switching element, the apparatus comprising: A phase angle detection unit, configured to detect the phase angle information of the input AC voltage; as well as The frequency determination unit is configured to synchronize the period of the preset frequency change value with the period of the input AC voltage by applying phase angle information to the preset frequency change value, and to determine the value obtained by applying the synchronized frequency change value to the preset base frequency value as the switching frequency of the switching element. The frequency determination unit includes: A cosine calculation unit, configured to calculate the cosine value of phase angle information; A multiplier configured to multiply the cosine value obtained by the cosine calculation unit by a preset frequency change value; and An adder configured to add the multiplication result of the multiplier to the fundamental frequency value to derive the switching frequency of the switching element; The frequency determination unit is configured to determine the switching frequency of the switching element according to the following formula: f SW_PFC = f SW_PFC_OnjAmp × cos(θ) + f SW_PFC_Base Among them, f SW_PFC f is the switching frequency of the switching element. SW_PFC_OnjAmp Here, f is the preset frequency variation value used to widen the fundamental frequency value, cos(θ) is the cosine of the phase angle of the input AC voltage, and f is the frequency variation value used to widen the fundamental frequency value. SW_PFC_Base This is the fundamental frequency value.

2. The apparatus for controlling the power factor correction circuit of a charger for charging a vehicle battery according to claim 1, wherein, The phase angle detection unit is configured to detect the phase angle information of the input AC voltage using a dq phase-locked loop structure.

3. The apparatus for controlling the power factor correction circuit of a charger for charging a vehicle battery according to claim 1, wherein, The phase angle detection unit includes: A dq converter configured to convert an input AC voltage into a dq voltage; A proportional-integral controller configured to output an angular velocity value that causes the q-axis voltage of the dq voltage obtained by the dq converter to converge to zero; and An integrator is configured to integrate the output of a proportional-integral controller to derive phase angle information.

4. The apparatus for controlling the power factor correction circuit of a charger for charging a vehicle battery according to claim 3, wherein, The dq converter converts the input AC voltage and its quadrature component voltage, which has a 90-degree phase difference with the input AC voltage, into a dq voltage.

5. The apparatus for controlling the power factor correction circuit of a charger for charging a vehicle battery according to claim 3, wherein, The q-axis voltage represents the error between the phase angle of the input AC voltage and the phase angle information detected by the phase angle detection unit.

6. The apparatus for controlling the power factor correction circuit of a charger for charging a vehicle battery according to claim 1, wherein, The frequency determination unit further includes a multiplexer configured to select one of the base frequency value and a switching frequency derived from the adder based on an external control signal.

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