Power converter, charger, vehicle, power unit, power factor improvement circuit, dc-dc converter, and inverter

Abstract

To provide a power converter capable of correcting an on time of a switching element with an invariably proper correction quantity and performing accurate interleaving control.SOLUTION: A PFC circuit comprises a PI control part 32 which functions as an on time correction value calculation part calculating an on time correction value Δton in a direction where a phase deviation Δθ between a target phase difference (180°) of a control phase (second phase) from a comparison phase (first phase) and a measurement phase difference is suppressed. The PFC circuit comprises a gain adjustment part 33, an adder 34 and a multiplier 35 functioning as an on time generation part generating an on time ton2 of a switching element in a control phase (second phase) by converting the on time correction value Δton into a level (1+α) of deviation from 100%, and multiplying a reference on time ton by the level (1+α) of deviation.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an interleaved power converter that converts an input voltage into an output voltage and operates multiple phases with a target phase difference, a charging device, a vehicle, a power supply device, a power factor correction circuit, a DC-DC converter, and an inverter. [Background technology]

[0002] An interleaved converter has been proposed in which a multi-phase power factor correction circuit that converts an AC input voltage into a DC output voltage is operated with a target phase difference (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-91981 Summary of the Invention [Problem to be solved by the invention]

[0004] The phase between phases is adjusted by adding the PI control output (Δton) for the error from the target phase difference to the pre-calculated on time (ton) of the main switch. However, when an interleaved converter is operated in critical mode, the switching frequency is variable (not fixed). Therefore, the PI control output (Δton) for the error from the target phase difference is a value that does not depend on the switching frequency, which creates the problem of not being able to obtain an appropriate correction amount.

[0005] One aspect of the present invention is to provide a power converter, a charging device, a vehicle, a power supply device, a power factor correction circuit, a DC-DC converter, and an inverter that can always correct the on-time of a switching element by an appropriate correction amount and perform accurate interleaving control. [Means for solving the problem]

[0006] A power converter according to one aspect of the present invention converts an input voltage into an output voltage by controlling the on / off of a switching element. The power converter includes a control phase and a comparison phase that are operated with a target phase difference. The power converter includes a reference on-time determiner that determines a reference on-time for turning on the switching element using the output voltage and an output voltage command value. The power converter includes an on-time correction value calculator that calculates an on-time correction value that reduces a phase deviation between the target phase difference of the control phase and a measured phase difference relative to the comparison phase. The power converter includes an on-time generator that generates an on-time of the switching element in the control phase by multiplying the reference on-time by a correction factor based on the on-time correction value. A charging device according to one aspect of the present invention charges a storage battery. The charging device includes the power converter described above. The power converter uses supplied power as the input voltage and uses the output voltage as a DC voltage for charging the storage battery.

[0007] A vehicle according to one aspect of the present invention is equipped with a storage battery. The vehicle includes the above-described power converter. The power converter uses supply power supplied from outside the vehicle as the input voltage and uses the output voltage as a DC voltage for charging the storage battery 5.

[0008] A power supply device according to one aspect of the present invention includes either or both of a charging device that charges a storage battery and a discharging device that discharges the storage battery. The power supply device includes the above-described power converter in at least one of the charging device and the discharging device. The charging device includes the power converter, which uses supplied power as the input voltage and converts the output voltage into power for charging the storage battery. The discharging device includes a power converter, which uses power stored in the storage battery as the input voltage and converts the output voltage into power supplied to a load.

[0009] A power factor correction circuit according to one aspect of the present invention converts an AC input voltage into a DC output voltage by controlling the on / off of a switching element. The power factor correction circuit includes a control phase and a comparison phase that operate at a target phase difference. The power factor correction circuit includes a reference on-time determiner that determines a reference on-time for turning on the switching element using the output voltage and an output voltage command value. The power factor correction circuit includes an on-time correction value calculator that calculates an on-time correction value that reduces a phase deviation between the target phase difference of the control phase and a measured phase difference relative to the comparison phase. The power factor correction circuit includes an on-time generator that generates an on-time of the switching element in the control phase by multiplying the reference on-time by a correction factor based on the on-time correction value.

[0010] A DC-DC converter according to one aspect of the present invention converts a DC input voltage Vin into a DC output voltage Vo by controlling the on / off of a switching element. The power converter includes a control phase operated with a target phase difference and a comparison phase. The DC-DC converter includes a reference on-time determiner that determines a reference on-time for turning on the switching element using the output voltage and an output voltage command value. The DC-DC converter includes an on-time correction value calculator that calculates an on-time correction value that reduces the phase deviation between the target phase difference of the control phase and the measured phase difference relative to the comparison phase. The DC-DC converter includes an on-time generator that generates the on-time of the switching element in the control phase by multiplying the reference on-time by a correction factor based on the on-time correction value.

[0011] An inverter according to one aspect of the present invention converts a DC input voltage Vin into an AC output voltage Vo by controlling the on / off of switching elements Q1 and Q2. The inverter includes a control phase that operates with a target phase difference and a comparison phase. The inverter includes a reference on-time determiner that determines a reference on-time for turning on the switching elements using the output voltage and an output voltage command value. The inverter includes an on-time correction value calculator that calculates an on-time correction value that reduces the phase deviation between the target phase difference of the control phase and the measured phase difference relative to the comparison phase. The inverter includes an on-time generator that generates the on-time of the switching elements in the control phase by multiplying the reference on-time by a correction factor based on the on-time correction value. [Effects of the Invention]

[0012] According to one aspect of the present invention, the on-time ton of the switching element is always corrected by an appropriate correction amount, and accurate interleave control can be performed. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 10 is a diagram illustrating an example of use of a power converter as a charging device. [Figure 2] FIG. 2 is a diagram illustrating a configuration example of a power factor correction circuit. [Figure 3] FIG. 2 is a diagram illustrating a configuration of a second-phase on-time generating section. [Figure 4] FIG. 10 is a diagram illustrating an example of generation of a second-phase on-time. [Figure 5] FIG. 10 is a diagram illustrating another exemplary configuration of the on-time generating unit. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, components having similar functions will be given the same reference numerals and descriptions thereof will be omitted as appropriate.

[0015] The power converter of this embodiment is a power factor correction circuit 1 (hereinafter referred to as PFC circuit 1) that converts AC voltage to DC voltage with high efficiency. Referring to Fig. 1, the PFC circuit 1 is configured as a charging device 3 together with a converter 2. The charging device 3 is used as a device that charges a storage battery 5 (battery) mounted on a vehicle 4 such as an electric vehicle.

[0016] As shown in FIG. 1(a), when the power supplied from outside the vehicle to the vehicle 4 is an AC power supply voltage such as a commercial power supply, the PFC circuit 1 is mounted on the vehicle 4 together with the converter 2. The PFC circuit 1 functions as a power converter that converts the AC voltage supplied to the vehicle 4 into a DC voltage. The converter 2 functions as a power converter that converts the DC voltage converted by the PFC circuit 1 into a DC voltage for charging the storage battery 5.

[0017] As shown in FIG. 1(b), when the power supplied from outside the vehicle to the vehicle 4 is a DC voltage, the PFC circuit 1 is installed together with the converter 2 in a facility outside the vehicle 4, such as a charging station. The PFC circuit 1 functions as a power converter that converts the AC power supply voltage supplied from a commercial power source or the like into a DC voltage. The converter 2 functions as a power converter that converts the DC voltage converted by the PFC circuit 1 into a DC voltage for charging the storage battery 5 mounted on the vehicle 4 and supplies the DC voltage to the vehicle 4.

[0018] The PFC circuit 1 is a power converter equipped with a two-phase critical mode power factor correction circuit that operates with a target phase difference (180°). Referring to Fig. 2, the PFC circuit 1 includes a rectifier 11, a first power factor correction circuit 12 (hereinafter referred to as the first PFC circuit 12), a second power factor correction circuit 13 (hereinafter referred to as the second PFC circuit 13), and an output capacitor Co.

[0019] The rectifier 11 is connected to the input terminal Tin + , Tin -The rectifier 11 full-wave rectifies an AC power supply voltage V1 input from the PFC circuit 11, and outputs the full-wave rectified AC power supply voltage V1 as an input voltage Vin to the first PFC circuit 12 and the second PFC circuit 13. The rectifier 11 is configured, for example, by a diode bridge, and a current serving as an input current Iin flows from the output of the rectifier 11.

[0020] The first PFC circuit 12 operates in phase 1 (first phase). The first PFC circuit 12 is connected between the positive output of the rectifier 11 and the positive output terminal To + The output diode D1 has an anode connected to the inductor L1 and a cathode connected to the positive output terminal To + The first PFC circuit 12 is connected to the connection point between the inductor L1 and the anode of the output diode D1, the negative output of the rectifier 11, and the negative output terminal To - The switching element Q1 is connected between the inductor L1 and the anode of the output diode D1, and has a source connected to the ground line 14. The switching element Q1 is configured, for example, by a MOS-type FET (Metal-Oxide-Semiconductor Field Effect Transistor). The switching element Q1 is connected to the connection point between the inductor L1 and the anode of the output diode D1, and has a source connected to the ground line 14.

[0021] The second PFC circuit 13 is connected in parallel with the first PFC circuit 12 and operates in Phase 2 (second phase) having a phase difference of 360° / 2=180° from Phase 1. The second PFC circuit 13 is connected between the positive output of the rectifier 11 and the positive output terminal To + The output diode D2 has an anode connected to the inductor L2 and a cathode connected to the positive output terminal To + are connected to the respective

[0022] The second PFC circuit 13 is connected to the connection point between the inductor L2 and the anode of the output diode D2, the negative output of the rectifier 11, and the negative output terminal To -The switching element Q2 is connected between the inductor L1 and the anode of the output diode D1, and has a source connected to the ground line 14. The switching element Q2 is configured, for example, by a MOS-type FET (Metal-Oxide-Semiconductor Field Effect Transistor). The switching element Q2 is connected to the connection point between the inductor L1 and the anode of the output diode D1, and has a source connected to the ground line 14.

[0023] PFC circuit 1 is connected to the positive output terminal To + and the negative output terminal To - An output capacitor Co is connected between the power supply and the ground line 14.

[0024] The PFC circuit 1 includes a control circuit 20 that operates the first PFC circuit 12 and the second PFC circuit 13 at a target phase difference (180°) (interleaved operation) and in critical mode. The control circuit 20 can be configured with a DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), or the like.

[0025] The control circuit 20 supplies a switching signal G1 to the gate of the switching element Q1 of the first PFC circuit 12 and a switching signal G2 to the gate of the switching element Q2 of the second PFC circuit 13. The control circuit 20 controls the on / off of the switching elements Q1 and Q2 with a target phase difference (180°) using the switching signals G1 and G2.

[0026] The control circuit 20 detects the timing at which the inductor currents IL1 and IL2 flowing through the inductors L1 and L2, respectively, reach their minimum values. The control circuit 20 controls the turn-on of the switching element Q1 at the timing at which the inductor current IL1 reaches its minimum value, and controls the turn-on of the switching element Q2 at the timing at which the inductor current IL2 reaches its minimum value. The inductor currents IL1 and IL2 can be detected using, for example, a shunt resistor, a Hall element, or the like as a current detector.

[0027] The control circuit 20 calculates an input current Iin, an output voltage Vo, which is the voltage across the output capacitor Co, and an output voltage command value Vo * and determine the reference on-time ton for turning on the switching elements Q1 and Q2 of phase 1. The input current Iin can be detected using, for example, a shunt resistor or a Hall element as a current detector. The output voltage Vo can be detected using, for example, a voltage divider circuit as a voltage detector. Note that the technology for driving the first PFC circuit 12 and the second PFC circuit 13 in the critical mode interleaving method is well known, and therefore a detailed description thereof will be omitted.

[0028] The control circuit 20 includes a second-phase on-time generator 21. The control circuit 20 uses a reference on-time ton as the on-width of the switching signal G1 (hereinafter referred to as a first-phase on-time ton1), and uses the on-width of the switching signal G2 (hereinafter referred to as a second-phase on-time ton2) generated by the second-phase on-time generator 21.

[0029] Referring to FIG. 3, the second phase on-time generating unit 21 includes a subtractor 31, a PI control unit 32, a gain adjusting unit 33, an adder 34, and a multiplier 35.

[0030] Subtractor 31 calculates a phase deviation Δθ by subtracting a target phase (180°) for phase 1 from the measured phase difference between phase 2 and phase 1. The measured phase difference between phase 2 and phase 1 is calculated using the following equation.

[0031]

number

[0032] The PI control unit 32 calculates an on-time correction value Δton in a direction to suppress the phase deviation Δθ by PI control, based on the phase deviation Δθ calculated by the subtractor 31. PID control or P control may be used instead of PI control.

[0033] The gain adjustment unit 33 adjusts the gain of the on-time correction value Δton to convert it into a value α that falls within the range of at least −1 to +1. The PI control unit 32 may perform the gain adjustment itself, and directly output the value α that falls within the range of −1 to +1.

[0034] Adder 34 adjusts the gain of on-time correction value Δton to a value α that falls within the range of at least −1 to +1, and outputs the result (1+α) to multiplier 35. (1+α) calculated by adder 34 is a value converted into the degree of deviation of the output of PI control from 100%.

[0035] Multiplier 35 generates second-phase on-time ton2 by multiplying the reference on-time ton determined by control circuit 20 by the deviation degree (1 + α) calculated by adder 34. When there is no phase deviation Δθ, the deviation degree (1 + α) = 1, and second-phase on-time ton2 = reference on-time ton.

[0036] An example of generation of the second phase on-time ton2 by the second phase on-time generation unit 21 will be described in detail with reference to Fig. 4. In Fig. 4, (a) is an example of generation when phase 2 is a phase leading the target phase (180°), and (b) is an example of generation when phase 2 is a phase lagging the target phase (180°).

[0037] As shown in Figure 4(a), when the second phase on-time ton2 from time t1 to t2 becomes a phase that is ahead of the target phase (180°), the phase deviation Δθ and the outputs of the PI control unit 32 and the gain adjustment unit 33 become positive values, and the deviation degree (1 + α) becomes a value greater than 1.

[0038] The second-phase on-time ton2 from time t3 to t4, obtained by multiplying by the deviation degree (1+α) that is greater than 1, becomes longer than the reference on-time ton of phase 1 determined by control circuit 20. This lengthens the switching period of phase 2 (times t3 to t5), and as a result, the phase difference is maintained at 180°.

[0039] As shown in Figure 4(b), when the second phase on-time ton2 from time t1 to t2 becomes a delayed phase compared to the target phase (180°), the phase deviation Δθ and the outputs of the PI control unit 32 and the gain adjustment unit 33 become negative values, and the deviation degree (1 + α) becomes a value smaller than 1.

[0040] The second-phase on-time ton2 from time t3 to t4, obtained by multiplying by the deviation degree (1+α) smaller than 1, is shorter than the reference on-time ton of phase 1 determined by control circuit 20. This shortens the switching period of phase 2 (times t3 to t5), and as a result, the phase difference is maintained at 180°.

[0041] The second-phase on-time generator 21 does not add the PI output result to ton, but converts it into the deviation degree (1 + α), which is a correction factor, and multiplies it. Therefore, even in a variable-frequency converter such as a critical-mode PFC circuit, the second-phase on-time ton2 is always corrected by an appropriate amount, enabling accurate interleaving control. Accurate interleaving control can reduce input and output ripple currents, leading to reduced noise.

[0042] The above-described second-phase on-time generating unit 21 is configured to adjust the phase of the second-phase on-time ton2 of phase 2, which is the slave phase, with phase 1 as the master phase, but it may also adjust the phases of phase 1 and phase 2 individually.

[0043] 5 uses a reference on-time ton to generate a first-phase on-time ton1 and a second-phase on-time ton2. In addition to the configuration of the second-phase on-time generator 21 shown in FIG. 3, the on-time generator 21a includes a selector switch 36, an inverting multiplier 37, a first-phase adder 34a, and a first-phase multiplier 35a.

[0044] When the output value α from the gain adjuster 33 is positive, the selector switch 36 outputs the output value α to the adder 34. That is, when the second-phase on-time ton2 leads the target phase (180°), the second-phase on-time ton2 obtained by multiplying by the deviation degree (1+α) becomes longer than the reference on-time ton.

[0045] When the output value α from the gain adjustment unit 33 is negative, the changeover switch 36 outputs the output value α to the inverting multiplier 37. The inverting multiplier 37 multiplies the output value α by a negative constant "-1" and outputs the inverse of the output value α, -α, to the first-phase adder 34a as a value obtained by multiplying the on-time correction value Δton by a negative coefficient.

[0046] The first phase adder 34a outputs (1-α) obtained by adding 1 (100%) to the inverse number -α to the first phase multiplier 35a.

[0047] The first-phase multiplier 35a generates the first-phase on-time ton1 by multiplying the reference on-time ton determined by the control circuit 20 by the deviation degree (1-α) calculated by the first-phase adder 34a. The deviation degree (1-α) is a value equal to or greater than 1. Therefore, when the second-phase on-time ton2 lags the target phase (180°), the first-phase on-time ton1 obtained by multiplying by the deviation degree (1-α) becomes longer than the reference on-time ton.

[0048] The on-time generation unit 21a does not distinguish between master and slave, and performs control to lengthen either the first-phase on-time ton1 or the second-phase on-time ton2 depending on whether the PI control output is positive or negative. The on-time generation unit 21a may also perform control to shorten either the first-phase on-time ton1 or the second-phase on-time ton2 depending on whether the PI control output is positive or negative. In this case, the selector switch 36 outputs the output value α to the adder 34 when the output value α is negative, and outputs the output value α to the inverting multiplier 37 when the output value α is positive.

[0049] In the above embodiment, an example of phase adjustment control to shift the phases of two-phase PFC circuits by 180° has been described, but similar control can be applied to three or more phases. In this case, the target phase difference can be changed to 120° for three phases, 90° for four phases, and (360 / N)° for N phase.

[0050] The above embodiment is not limited to the PFC circuit 1 described above, as long as it is a circuit in which multiple legs, each having a switching element, operate with a predetermined phase difference. This embodiment can be applied to, for example, a DC-DC converter (converter 2) that converts a DC voltage to a DC voltage, or an inverter that converts a DC voltage to an AC voltage. In particular, this embodiment is effective when applied to a circuit in which the switching frequency changes, because the on-time ton2 is corrected proportionally.

[0051] The above-described embodiment can be applied to a power supply device such as an emergency power supply that backs up power supplied to important equipment (transportation control systems, emergency lighting equipment in buildings, etc.) that cannot tolerate even a power outage in the event of a power outage. The power supply device includes either or both of a charging device 3 that charges a storage battery 5 and a discharging device that discharges from the storage battery 5. The power supply device includes a power converter according to this embodiment in at least one of the charging device and the discharging device. The charging device 3 includes a power converter that uses the supplied power as an input voltage Vin and outputs an output voltage Vo as power to charge the storage battery 5. The discharging device includes a power converter that uses the power stored in the storage battery 5 as an input voltage Vin and outputs an output voltage Vo as power to supply to a load.

[0052] (summary) (1) The power converter according to this embodiment converts an input voltage Vin into an output voltage Vo by controlling the on / off of switching elements Q1 and Q2. The power converter has a control phase (second phase) and a comparison phase (first phase) that operate with a target phase difference. The power converter calculates the output voltage Vo and the output voltage command value Vo. *The power converter includes a control circuit 20 that functions as a reference on-time determiner that determines a reference on-time ton for turning on switching elements Q1 and Q2 using a PI control unit 32 that functions as an on-time correction value calculator that calculates an on-time correction value Δton in a direction that reduces a phase deviation Δθ between a target phase difference (180°) of a control phase (second phase) relative to a comparison phase (first phase) and a measured phase difference. The power converter includes an on-time generator that multiplies the reference on-time ton by a correction factor (deviation from 100% (1+α)) based on the on-time correction value Δton to generate an on-time ton2 of switching element Q2 in the control phase (second phase). A gain adjuster 33, an adder 34, and a multiplier 35 function as the on-time generator.

[0053] According to the power converter described in (1) above, the on-time ton2 of the switching element Q2 is always corrected by an appropriate correction amount, enabling accurate interleaving control. Accurate interleaving control can reduce input and output ripple currents, leading to reduced noise.

[0054] (2) The on-time generating unit (on-time generating unit 21a) described in (1) above generates the on-time ton1 of the switching element Q1 in the comparison phase (first phase). The on-time ton1 is generated by multiplying the reference on-time ton by a correction factor (deviation from 100% (1-α)) based on the value -α obtained by multiplying the on-time correction value Δton by a negative coefficient.

[0055] According to the power converter described in (2) above, the direction of correction can be made uniform for each phase.

[0056] (3) The charging device 3 according to this embodiment charges the storage battery 5. The charging device 3 includes the power converter described in (1) or (2). The power converter uses the supplied power as an input voltage Vin and an output voltage Vo as a DC voltage for charging the storage battery 5.

[0057] According to the charging device 3 described in (3) above, the power converter can perform accurate interleaving control, thereby reducing input and output ripple currents and improving the charging efficiency of the storage battery 5.

[0058] (4) The vehicle 4 according to this embodiment is equipped with a storage battery 5. The vehicle 4 includes the power converter described in (1) or (2). The power converter uses the supply power supplied from outside the vehicle as an input voltage Vin and uses the output voltage Vo as a DC voltage for charging the storage battery 5.

[0059] According to the vehicle 4 described in (4) above, the power converter can perform accurate interleaving control, thereby reducing input and output ripple currents and improving the charging efficiency of the storage battery 5.

[0060] (5) The power supply device according to this embodiment includes either or both of a charging device 3 that charges a storage battery 5 and a discharging device that discharges the storage battery 5. The power supply device includes the power converter described in (1) or (2) in at least one of the charging device and the discharging device. The charging device 3 includes a power converter that uses supplied power as an input voltage Vin and an output voltage Vo as power for charging the storage battery 5. The discharging device includes a power converter that uses power stored in the storage battery 5 as an input voltage Vin and an output voltage Vo as power to be supplied to a load.

[0061] According to the power supply device described in (5) above, the power converter can perform accurate interleaving control, thereby reducing input and output ripple currents and improving the efficiency of charging the storage battery 5.

[0062] (6) The PFC circuit 1 according to this embodiment converts an AC input voltage Vin into a DC output voltage Vo by controlling the on / off of switching elements Q1 and Q2. The PFC circuit 1 has a control phase (second phase) and a comparison phase (first phase) that operate with a target phase difference. The PFC circuit 1 calculates the output voltage Vo and the output voltage command value Vo. *The PFC circuit 1 includes a control circuit 20 that functions as a reference on-time determiner that determines a reference on-time ton for turning on the switching elements Q1 and Q2 using the above. The PFC circuit 1 includes a PI control unit 32 that functions as an on-time correction value calculator that calculates an on-time correction value Δton in a direction that reduces the phase deviation Δθ between the target phase difference (180°) of the control phase (second phase) with respect to the comparison phase (first phase) and the measured phase difference. The PFC circuit 1 includes an on-time generator that multiplies the reference on-time ton by a correction factor (deviation from 100% (1+α)) based on the on-time correction value Δton to generate an on-time ton2 of the switching element Q2 in the control phase (second phase). The gain adjuster 33, adder 34, and multiplier 35 function as the on-time generator.

[0063] According to the PFC circuit 1 described in (6) above, the on-time ton2 of the switching element Q2 is always corrected by an appropriate correction amount, enabling accurate interleaving control. Accurate interleaving control can reduce input and output ripple currents, leading to reduced noise.

[0064] (7) The DC-DC converter according to this embodiment converts a DC input voltage Vin into a DC output voltage Vo by controlling the on / off of switching elements Q1 and Q2. The DC-DC converter has a control phase (second phase) and a comparison phase (first phase) that operate with a target phase difference. The PFC circuit 1 controls the output voltage Vo and the output voltage command value Vo *The DC-DC converter includes a control circuit 20 that functions as a reference on-time determiner that determines a reference on-time ton for turning on switching elements Q1 and Q2 using a PI control unit 32 that functions as an on-time correction value calculator that calculates an on-time correction value Δton in a direction that reduces the phase deviation Δθ between the target phase difference (180°) of the control phase (second phase) relative to the comparison phase (first phase) and the measured phase difference. The DC-DC converter includes an on-time generator that multiplies the reference on-time ton by a correction factor (deviation from 100% (1+α)) based on the on-time correction value Δton to generate an on-time ton2 of switching element Q2 in the control phase (second phase). A gain adjuster 33, an adder 34, and a multiplier 35 function as the on-time generator.

[0065] According to the DC-DC converter described in (7) above, the on-time ton2 of the switching element Q2 is always corrected by an appropriate correction amount, enabling accurate interleave control. Accurate interleave control can reduce input and output ripple currents, leading to reduced noise.

[0066] (8) The inverter according to this embodiment converts a DC input voltage Vin into an AC output voltage Vo by controlling the on / off of switching elements Q1 and Q2. The inverter has a control phase (second phase) and a comparison phase (first phase) that operate with a target phase difference. The inverter calculates the output voltage Vo and the output voltage command value Vo * The inverter includes a control circuit 20 that functions as a reference on-time determiner that determines a reference on-time ton for turning on switching elements Q1 and Q2 using the above. The inverter includes a PI control unit 32 that functions as an on-time correction value calculator that calculates an on-time correction value Δton in a direction that reduces the phase deviation Δθ between the target phase difference (180°) of the control phase (second phase) with respect to the comparison phase (first phase) and the measured phase difference. The inverter includes an on-time generator that multiplies the reference on-time ton by a correction factor (deviation from 100% (1+α)) based on the on-time correction value Δton to generate an on-time ton2 of switching element Q2 in the control phase (second phase). A gain adjuster 33, an adder 34, and a multiplier 35 function as the on-time generator.

[0067] According to the inverter described in (8) above, the on-time ton2 of the switching element Q2 is always corrected by an appropriate correction amount, enabling accurate interleaving control. Accurate interleaving control can reduce input and output ripple currents, leading to reduced noise.

[0068] Although the present invention has been described above with reference to specific embodiments, it goes without saying that the above embodiments are merely examples and can be modified and implemented without departing from the spirit of the present invention. [Explanation of symbols]

[0069] 1 PFC circuit (power factor correction circuit) 2 Converter 3 Charging device 4 vehicles 5. Storage battery 11 Rectifier 12 First PFC circuit (first power factor correction circuit) 13 Second PFC circuit (second power factor correction circuit) 14 Ground wire 20 Control circuit 21 Second phase on-time generator 21a ON time generation section 31 Subtractor 32 PI control unit 33 Gain adjustment section 34 Adder 34a 1st phase adder 35 Multiplier 35a First phase multiplier 36 Changeover switch 37 Inverting Multiplier

Claims

1. A power converter that converts an input voltage into an output voltage by controlling the on / off of a switching element, A control phase and a comparison phase are provided to operate at a target phase difference, a reference on-time determination unit that determines a reference on-time for turning on the switching element using the output voltage and an output voltage command value; an on-time correction value calculation unit that calculates an on-time correction value in a direction that reduces a phase deviation between the target phase difference of the control phase and the measured phase difference with respect to the comparison phase; an on-time generating unit that generates an on-time of the switching element in the control phase by multiplying the reference on-time by a correction factor based on the on-time correction value.

2. 2. The power converter according to claim 1, wherein the on-time generation unit generates the on-time of the switching element in the comparison phase by multiplying the reference on-time by a correction factor based on a value obtained by multiplying the on-time correction value by a negative coefficient.

3. A charging device for charging a storage battery, 3. A charging device comprising the power converter according to claim 1, wherein the supplied power is the input voltage, and the output voltage is a DC voltage for charging the storage battery.

4. A vehicle equipped with a storage battery, 3. A vehicle equipped with the power converter according to claim 1, wherein the input voltage is power supplied from outside the vehicle, and the output voltage is a DC voltage for charging the storage battery.

5. A power supply device including either or both of a charging device that charges a storage battery and a discharging device that discharges from the storage battery, A power supply device comprising the power converter according to claim 1 or 2 in at least one of the charging device and the discharging device.

6. A power factor correction circuit that converts an AC input voltage into a DC output voltage by controlling the on / off of a switching element, A control phase and a comparison phase are provided to operate at a target phase difference, a reference on-time determination unit that determines a reference on-time for turning on the switching element using the output voltage and an output voltage command value; an on-time correction value calculation unit that calculates an on-time correction value in a direction that reduces a phase deviation between the target phase difference of the control phase and the measured phase difference with respect to the comparison phase; an on-time generating unit that generates an on-time of the switching element in the control phase by multiplying the reference on-time by a correction factor based on the on-time correction value.

7. A DC-DC converter that converts a DC input voltage into a DC output voltage by controlling on / off of a switching element, A control phase and a comparison phase are provided to operate at a target phase difference, a reference on-time determination unit that determines a reference on-time for turning on the switching element using the output voltage and an output voltage command value; an on-time correction value calculation unit that calculates an on-time correction value in a direction that reduces a phase deviation between the target phase difference of the control phase and the measured phase difference with respect to the comparison phase; an on-time generating unit that generates an on-time of the switching element in the control phase by multiplying the reference on-time by a correction factor based on the on-time correction value.

8. An inverter that converts a DC input voltage into an AC output voltage by controlling the on / off of a switching element, A control phase and a comparison phase are provided to operate at a target phase difference, a reference on-time determination unit that determines a reference on-time for turning on the switching element using the output voltage and an output voltage command value; an on-time correction value calculation unit that calculates an on-time correction value in a direction that reduces a phase deviation between the target phase difference of the control phase and the measured phase difference with respect to the comparison phase; an on-time generating unit that generates an on-time of the switching element in the control phase by multiplying the reference on-time by a correction factor based on the on-time correction value.

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