JP2017158322A - Battery charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery charger capable of reducing or eliminating overlapping of circuits corresponding to a DC conversion circuit and further outputting AC power from a receptacle provided in a vehicle to a home electrical product in the middle of charging a battery of the vehicle from an external power source.SOLUTION: The present invention relates to a battery charger 100 comprising: a power factor improvement circuit 10 including a rectifier circuit 11 connected to AC power; a DC conversion circuit 20 of which one end is connected to the power factor improvement circuit and the other end is connected to a battery BAT; and an AC conversion circuit 30 which inputs power and outputs AC power. The power factor improvement circuit includes a capacitor 13 at a side connected to the DC conversion circuit and a power factor control circuit 12 at a side connected to the rectifier circuit. The DC conversion circuit includes a DC voltage conversion part 21 at a side to which power is inputted, and a smoothing part 22 at a side to which the battery BAT is connected. The AC conversion circuit is connected at any position from between the capacitor and the power factor control circuit to between the DC voltage conversion part and the smoothing part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a charger, and more particularly to a charger having a function of a DC-AC conversion circuit.

  2. Description of the Related Art Conventionally, in a vehicle that can be charged from an alternating current external power source to a battery, a vehicle device that enables output of alternating current by providing an outlet for connecting home appliances and the like is known. For example, Patent Literature 1 discloses a power supply device that can suppress the use of an electric device connected to an outlet provided in a vehicle from being limited by the amount of power that can be supplied from an external power source to the electric device. The power supply device or the like includes a power conversion device and an electronic control unit that controls the power conversion device. The power conversion device is electrically connected to the charging inlet, the power storage device, and the outlet, and converts the power supplied from the power storage device into the power supplied to the outlet. When the electric power that can be supplied from the external power supply to the outlet is smaller than the power that can be output from the outlet, the electronic control unit is supplied to the outlet of the supplied power and stored in the power storage device according to the power consumption of the electrical equipment. Controls power output to the outlet.

  Patent Document 2 discloses a power supply device that can charge a main battery and an auxiliary battery with a system power supply, and can output electric power for home appliances using at least the main battery as a power supply without providing a dedicated DC / AC inverter. Is disclosed. In this power supply device, a first bridge circuit is connected between the main battery and the transformer, and a bidirectional inverter having two H bridge circuits is connected between the transformer and the system power supply connection section. In addition, an auxiliary battery can be connected to the main battery side and the system power supply connection side via a DC / DC converter. The power supply device controls each switching element of the first bridge circuit and the H bridge circuit by the control device, charges the main battery and the auxiliary battery with the system power supply, and exchanges the power of the main battery from the system power supply connection section. Or output as a voltage.

  Patent Document 3 discloses an external power feeding device for an electric vehicle that can easily and safely supply electric power to an electric device outside the vehicle. The external power supply device includes a drive battery, an AC inverter, an in-vehicle outlet provided in the vehicle, a relay for turning on or off the output from the AC inverter, a normal charging port exposed outside the vehicle, A vehicle controller for controlling the relay is provided. The relay is connected downstream from the in-vehicle outlet as viewed from the AC inverter, and the normal charging port is connected downstream from the relay. When the connection of the adapter to the normal charging port is detected, the vehicle controller turns on the relay and supplies the output from the AC inverter from the normal charging port.

  Patent Document 4 discloses an external power supply device and the like suitable for outdoor use. This external power supply device or the like includes an external power supply terminal portion having a terminal that is expected to be used for a long time, a DC-AC inverter and a shut-off device that supply power of a high-voltage battery to a terminal box, and a control device that controls them With. The control device includes a use lower limit SOC setting unit that sets a use lower limit SOC of the high-voltage battery, and a power supply control unit. The use lower limit SOC setting unit calculates the amount of power consumed by the long-time electric device during the use time based on the power consumption and the use time of the long-time electric device, and uses the high-voltage battery. Set the lower limit SOC. The power supply control unit compares the actual measured SOC of the high voltage battery with the lower limit SOC, and performs control related to the remaining amount of the high voltage battery based on the result.

  Patent Document 5 discloses a power supply device for automobile that realizes low cost. In this automobile power supply device, the DC voltage from the main battery is boosted by a DC / DC converter, and the boosted DC voltage is converted into AC power by a DC / AC inverter and supplied to an output connector of an outlet. That is, a DC / DC converter and a DC / AC inverter are connected in series to the main battery. This document shows an outline of an AC inverter.

  Patent Document 6 discloses a DC-AC inverter that can cope with a wide DC input voltage range. The DC-AC inverter adjusts the switching duty of the DC-AC converter according to the voltage after conversion by the DC-DC converter and outputs an AC voltage from the DC-AC converter. This document shows an example of a circuit configuration of an AC inverter.

JP2013-240241A JP 2008-312395 A JP, 2014-030283, A JP 2014-064457 A Japanese Patent Laid-Open No. 09-074666 JP 2013-219982 A

  In the power supply device disclosed in Patent Document 2, AC power cannot be output to an electric home appliance or the like from an outlet provided in the vehicle while charging from an external power supply (system power supply). Further, in the power supply device disclosed in Patent Document 1, it is possible to output from the outlet during charging if the voltage is the same, but for example, during charging at AC 200 V, the charging voltage differs from the outlet. Since it is not possible to output an alternating voltage of 100 V, home appliances cannot be used.

  In addition, in the external power supply devices disclosed in Patent Document 3 and Patent Document 4, in addition to the DC conversion circuit (DC / DC converter) shown in these documents, an input to an AC conversion circuit (AC inverter) that outputs to an outlet is performed. A DC conversion circuit that converts the voltage is required, and the circuits overlap.

  The present invention reduces or eliminates the duplication of a circuit corresponding to a DC conversion circuit, and further, while charging the vehicle battery from the external power source supplying AC power, the external power source from the outlet provided in the vehicle. It is intended to provide a charger capable of outputting AC power having a voltage different from that of the battery.

In order to solve the above problems, in a charger for charging a battery, a power factor correction circuit connected to AC power, a DC conversion circuit connected at one end to the power factor improvement circuit, and at the other end to the battery, and power And a power conversion circuit that outputs alternating current power and a power factor correction circuit on the side connected to the direct current conversion circuit and on the side connected to the power factor correction circuit It has a power factor control circuit, the DC conversion circuit has a DC voltage conversion unit on the power input side and a smoothing unit on the side connected to the battery, and the AC conversion circuit has a capacitor and a power factor control circuit. A charger is provided that is electromagnetically connected to any position between the DC voltage conversion unit and the smoothing unit.
According to this, the AC conversion circuit is connected to any position between the capacitor and the power factor control circuit and between the DC voltage conversion unit and the smoothing unit, and thus a circuit corresponding to the DC conversion circuit. Thus, it is possible to provide a charger that reduces or eliminates duplication.

Further, the AC conversion circuit may be electrically connected between the power factor correction circuit and the DC conversion circuit.
According to this, by connecting at the location of the direct current potential, a charger with a stable potential and a small loss can be provided.

Further, the AC conversion circuit may be connected by magnetic coupling in the DC voltage conversion unit.
According to this, it is possible to insulate the DC conversion circuit and the AC conversion circuit by connecting at the location of the AC potential.

Further, when the power factor correction circuit is connected to AC power, the DC conversion circuit is operated to output DC power, and the AC conversion circuit is operated to output AC power.
According to this, AC power different from the voltage of the external power source can be output while charging the battery from the external power source.

Further, when the power factor correction circuit is not connected to AC power, the AC conversion circuit receives power from the battery via at least a part of the DC conversion circuit and outputs AC power. Also good.
According to this, when the battery of the vehicle is not charged from the external power source, AC power can be output using the power of the battery.

  According to the present invention, the overlap of the circuit corresponding to the DC conversion circuit is reduced or eliminated, and further, while charging the battery of the vehicle from the external power supply supplying AC power, the voltage different from that of the external power supply is applied. A charger capable of outputting AC power can be provided.

The circuit diagram of the charger of the 1st Example concerning the present invention. Explanatory drawing which shows the flow of the electric current in the charger of the 1st Example which concerns on this invention. The block diagram explaining the connection place of the alternating current converter circuit in the charger of the 2nd Example which concerns on this invention. Explanatory drawing which shows the flow of the electric current in the charger of the 2nd Example which concerns on this invention. The block diagram explaining the connection place of the alternating current converter circuit in the charger of the 3rd Example which concerns on this invention. Explanatory drawing which shows the flow of the electric current in the charger of the 3rd Example which concerns on this invention. The block diagram (part) explaining the connection place of the alternating current converter circuit in the charger of 4th Example which concerns on this invention. Explanatory drawing which shows the flow of the electric current in the charger of 4th Example which concerns on this invention. The block diagram of the charger in a prior art.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. First, with reference to FIG. 9, the charger 100Z provided with the function of the alternating current output in a prior art is demonstrated. This figure is a schematic diagram of a typical circuit diagram and block diagram in the prior art document.

  The charger 100Z is rectified from the AC power of the external power source PWR by a power factor correction circuit having a rectifier circuit to generate a DC voltage in the middle, and the DC voltage is adapted to the battery BAT by the DC voltage conversion circuit 1. The battery BAT is charged by stepping down or boosting the direct current voltage. Further, the charger 100Z generates the DC voltage output from the DC voltage conversion circuit 1 intermediately by the DC voltage conversion circuit 2 so as to be suitable for the downstream DC-AC conversion circuit, and the DC voltage is converted to DC. -It converts into a predetermined alternating voltage with an alternating current conversion circuit, and outputs it to the outlet OLT.

  For example, when the voltage of the battery BAT is 100V, the DC voltage conversion circuit 1 outputs a DC voltage of 100V, and the DC voltage conversion circuit 2 receives the input of the DC voltage of 100V and outputs the AC voltage of 100V from the outlet. In order to output, it is necessary to boost the voltage to a DC voltage of 141V. Thus, in charger 100Z having an AC output function, DC voltage conversion circuits that perform DC voltage voltage conversion overlap. According to the present invention, it is possible to reduce or eliminate such overlapping of circuits for converting DC voltage.

<First Example>
With reference to FIG. 1 and FIG. 2, the charger 100 in a present Example is demonstrated. The charger 100 is provided in the vehicle C and is configured to be supplied with electric power from the AC power of the external power supply PWR and charge the battery BAT of the vehicle C. The charger 100 has a power factor improving circuit 10 having a rectifier circuit 11 connected to AC power, a DC conversion circuit 20 having one end connected to the power factor improving circuit 10 and the other end connected to the battery BAT, and power input. And an AC conversion circuit 30 that outputs AC power.

  The power factor correction circuit 10 is a known element for suppressing the harmonic current from flowing into the transmission network of the external power source. The power factor correction circuit 10 includes a rectifier circuit 11 that rectifies alternating current connected to AC power, a capacitor 13 (phase advance capacitor) for improving the power factor on the side connected to the DC converter circuit 20, and the rectifier circuit 11. And a power factor control circuit 12 which is an element other than the capacitor 13 and exists between the rectifier circuit 11 and the capacitor 13. The power factor control circuit 12 is arranged on the rectifier circuit 11 side with respect to the capacitor 13. In the power factor control circuit 12, a coil and a diode are connected in series on the high potential side, and a switch that is turned on and off at a high frequency is connected between the connection point of the coil and the diode and the low potential side. The power factor correction circuit 10 is not limited to the circuit described above, and may be a known circuit that improves the power factor including a capacitor on the output side.

  The DC conversion circuit 20 is a so-called bidirectional DC / DC converter that includes a transformer and converts a DC voltage input from the power factor correction circuit 10 to a predetermined stable DC voltage by switching a switching element. The DC converter circuit 20 is connected to the DC voltage converter 21 on the side to which power is input (in this figure, the side connected to the power factor correction circuit 10) and to the side in which power is output (in this figure, connected to the battery BAT). On the side to be smoothed). The DC voltage converter 21 converts the input DC voltage into a predetermined DC voltage by switching the switching elements of the full bridge circuit arranged on both sides of the transformer. The smoothing unit 22 removes a pulsating component from the DC voltage converted by the DC voltage conversion unit 21 and outputs a stable DC voltage. Typically, it is composed of a coil and a capacitor as shown. Both the DC voltage conversion unit 21 and the smoothing unit 22 may be known circuits that perform the functions described above.

  One end of the AC conversion circuit 30 is electrically connected between the power factor correction circuit 10 and the DC conversion circuit 20, and the other end is connected to the outlet OLT. The AC conversion circuit 30 is a so-called AC inverter that receives an intermediate DC voltage between the power factor correction circuit 10 and the DC conversion circuit 20 and converts the DC power into AC power. The AC conversion circuit 30 converts DC power into AC power by switching the switching elements of the full bridge circuit. The AC conversion circuit 30 is not limited to the illustrated circuit, and may be a known AC inverter that receives a DC voltage and converts it into a predetermined AC voltage.

  The charger 100 may be provided with a switch 50 between the connection point between the power factor correction circuit 10 and the DC conversion circuit 20 and the AC conversion circuit 30 as shown in the figure. The switch 50 is ON / OFF controlled by the control unit 40. The control unit 40 monitors the current in the vicinity of the switch 50, and when the AC conversion circuit 30 or the outlet OLT is short-circuited, the switch 50 is turned off in order to avoid destruction of the power factor correction circuit 10 or the DC conversion circuit 20. To do. Note that the control unit 40 performs off / off control of the switches of the power factor correction circuit 10, the DC conversion circuit 20, and the AC conversion circuit 30 (control lines connected to each switch from the control unit 40 are omitted in the figure). ).

  FIG. 2 shows a current flow in the charger 100. A dotted arrow indicates a current flow when the battery BAT is charged and power is supplied to the outlet OLT when the rectifier circuit 11 is connected to the external power supply PWR. A dashed-dotted arrow indicates a current flow when power is supplied from the battery BAT to the outlet OLT when the rectifier circuit 11 is not connected to the external power supply PWR. This figure shows a circuit arrangement in which power flows from the power factor correction circuit 10 to the battery BAT via the DC conversion circuit 20. Since the DC conversion circuit 20 is a bidirectional DC-DC converter, when power flows from the battery BAT to the AC conversion circuit 30 via the DC conversion circuit 20, the DC voltage conversion unit 21 and the smoothing unit 22 are illustrated. It is assumed that they are arranged upside down.

  When the rectifier circuit 11 is connected to the AC power of the external power supply PWR, the charger 100 outputs a DC voltage, so the DC converter circuit 20 is operated by switching the switching element, and the DC 100 Electric power is output to the battery BAT and charged. Moreover, since the AC conversion circuit 30 is electrically connected to the output side of the power factor correction circuit 10, the AC conversion circuit 30 is operated by switching the switching element, and AC power is output to the outlet OLT. Therefore, the charger 100 can output AC power from the outlet OLT provided in the vehicle C to the home appliance or the like while charging the battery BAT of the vehicle C from the external power source PWR.

  In addition, when the rectifier circuit 11 is not connected to the AC power of the external power supply PWR, the charger 100 supplies the power of the battery BAT to the outlet OLT. In this case, as indicated by the alternate long and short dash line, the AC conversion circuit 30 is input with power from the battery BAT via the entire DC conversion circuit 20 (all of the DC voltage conversion unit 21 and the smoothing unit 22), and AC power Is output.

  As can be seen from the above description, the DC voltage intermediate between the power factor correction circuit 10 and the DC conversion circuit 20 input to the AC conversion circuit 30 receives the power from the external power supply PWR and is output by the power factor improvement circuit 10. A DC voltage or a DC voltage output from the DC conversion circuit 20 upon receiving power from the battery BAT. Since both are not necessarily the same DC voltage, the AC conversion circuit 30 receives a DC voltage having a plurality of voltage values and outputs an AC voltage of 100 V to an outlet OLT to which a normal home appliance or the like is connected.

  In the case of the present embodiment, the intermediate DC voltage input to the AC conversion circuit 30 between the power factor correction circuit 10 and the DC conversion circuit 20 is higher than the peak voltage output from the outlet OLT. For example, when an AC voltage of 100V is output from the outlet OLT, the peak voltage is 141V. Therefore, the DC voltage output from the power factor correction circuit 10 that receives power from the external power supply PWR and the DC voltage output from the DC conversion circuit 20 that receives power from the battery BAT is 141 V or higher. If it is 141 V or higher, it is only necessary to perform step-down conversion in order to output 100 V to the outlet OLT. Therefore, it is sufficient that the AC conversion circuit 30 performs step-down conversion.

  On the other hand, if the intermediate DC voltage between the power factor correction circuit 10 and the DC conversion circuit 20 is less than the peak voltage, a booster circuit may be required. When the power factor improving circuit 10 receives power from the external power supply PWR and outputs it, a conversion circuit that boosts the voltage separately is required by appropriately selecting the AC voltage of the external power supply PWR or boosting the power factor improving circuit 10. Make sure there is nothing. As described above, the AC converter circuit 30 is electrically connected between the power factor correction circuit 10 and the DC converter circuit 20, thereby providing the charger 100 in which the circuit corresponding to the DC converter circuit 20 is eliminated. can do. Further, by connecting at this direct current potential, a charger can be provided at the lowest cost and with less loss at a stable potential as compared to the embodiments described later.

  Even when the DC voltage between the power factor correction circuit 10 and the DC conversion circuit 20 is less than the peak voltage and a booster circuit is required, DC conversion is performed in combination with the DC conversion of the DC conversion circuit 20. Thus, the booster circuit can reduce the overlap of circuits for DC conversion.

<Second Example>
With reference to FIG. 3 and FIG. 4, the charger 100A in the present embodiment will be described. In addition, in order to avoid duplication description, the same code | symbol is attached | subjected to the same part as the said Example, and it demonstrates centering on a different part. The charger 100A includes a power factor correction circuit 10 having a rectifier circuit 11 connected to AC power of an external power supply PWR, a DC conversion circuit 20 having one end connected to the power factor improvement circuit 10 and the other end connected to the battery BAT. And an AC conversion circuit 30 that receives power and outputs AC power.

  One end of the AC conversion circuit 30 is electrically connected between the power factor control circuit 12 and the capacitor 13, and the other end is connected to the outlet OLT. The AC conversion circuit 30 receives an intermediate DC voltage between the power factor control circuit 12 and the capacitor 13 and converts the DC power into AC power. The AC conversion circuit 30 may be the same as the above-described embodiment, except that the connection location on the input side is different from that in the above-described embodiment.

  FIG. 4 shows the flow of current in charger 100A. As shown in FIG. 4, in the charger 100A, when the rectifier circuit 11 is connected to the external power supply PWR, the power factor correction circuit 10 outputs a DC voltage. Operate and charge the battery by outputting DC power to the battery BAT. Further, since the power factor control circuit 12 outputs a DC voltage, the AC conversion circuit 30 is electrically connected to the output side of the power factor control circuit 12 and is therefore connected to the DC potential. The AC conversion circuit 30 switches the switching element to operate the AC conversion circuit 30, converts the DC power, and outputs the AC power to the outlet OLT. Therefore, the charger 100A can output AC power from the outlet OLT provided in the vehicle C to the home appliance or the like while charging the battery BAT of the vehicle C from the external power source PWR.

  Further, when the rectifier circuit 11 is not connected to AC power, the charger 100A supplies the power of the battery BAT to the outlet OLT. In this case, as indicated by the alternate long and short dash line, the AC conversion circuit 30 receives power from the battery BAT via the entire DC conversion circuit 20 (the entire DC voltage conversion unit 21 and the smoothing unit 22), and the AC power Is output.

  As can be seen from the above description, the DC voltage intermediate between the power factor control circuit 12 and the capacitor 13 input to the AC conversion circuit 30 is the DC voltage output from the power factor control circuit 12 by receiving power from the external power supply PWR. Or a DC voltage output from the DC conversion circuit 20 upon receiving power from the battery BAT.

  In the case of the present embodiment, the DC voltage intermediate between the power factor control circuit 12 and the capacitor 13 input to the AC conversion circuit 30 is higher than the peak voltage output from the outlet OLT. For example, when an AC voltage of 100V is output from the outlet OLT, the peak voltage is 141V. Therefore, the DC voltage output from power factor control circuit 12 that receives power from external power supply PWR is boosted. The DC voltage received from the battery BAT and output from the DC converter circuit 20 requires a booster circuit of 141V or higher. If it is 141 V or higher, it is only necessary to perform step-down conversion in order to output 100 V to the outlet OLT. Therefore, it is sufficient that the AC conversion circuit 30 performs step-down conversion.

  On the other hand, if the intermediate DC voltage between the power factor control circuit 12 and the capacitor 13 is less than the peak voltage, a booster circuit may be necessary. When the DC conversion circuit 20 receives electric power from the battery BAT and outputs it, the DC conversion circuit 20 can appropriately boost the voltage to an appropriate DC voltage, so that the boosting conversion circuit is not necessary. When the power factor control circuit 12 receives electric power from the external power supply PWR and outputs it, a conversion circuit that boosts the voltage separately is required by appropriately selecting the AC voltage of the external power supply PWR or boosting the power factor control circuit 12. Make sure there is nothing. As described above, the AC converter circuit 30 is electrically connected between the power factor control circuit 12 and the capacitor 13 to provide a charger 100A in which the circuit corresponding to the DC converter circuit 20 is not duplicated. Can do. Further, the charger 100A is connected at this direct current potential, so that it has a stable potential and less loss than the fourth embodiment described later.

<Third embodiment>
With reference to FIG. 5 and FIG. 6, the charger 100B in a present Example is demonstrated. In addition, in order to avoid duplication description, the same code | symbol is attached | subjected to the same part as the said Example, and it demonstrates centering on a different part. The charger 100B includes a power factor correction circuit 10 having a rectifier circuit 11 connected to AC power of an external power supply PWR, a DC conversion circuit 20 having one end connected to the power factor improvement circuit 10 and the other end connected to the battery BAT. And an AC conversion circuit 30 that receives power and outputs AC power.

  One end of the AC conversion circuit 30 is electrically connected between the DC voltage conversion unit 21 and the smoothing unit 22, and the other end is connected to the outlet OLT. The AC conversion circuit 30 receives an intermediate DC voltage between the DC voltage conversion unit 21 and the smoothing unit 22 and converts the DC power into AC power. The AC conversion circuit 30 may be the same as the above-described embodiment, except that the connection location on the input side is different from that in the above-described embodiment. Further, a smoothing capacitor may be provided on the input side of the conversion circuit 30.

  FIG. 6 shows the flow of current in charger 100B. As shown in FIG. 6, in the charger 100B, when the rectifier circuit 11 is connected to the AC power of the external power supply PWR, the power factor correction circuit 10 outputs a DC voltage, switches the switching element, and converts to a DC converter circuit. 20 is operated to output DC power to the battery BAT for charging. Further, since the DC voltage conversion unit 21 outputs a voltage obtained by converting the DC voltage of the battery BAT, the AC conversion circuit 30 is connected to a position of the DC potential. Then, charger 100B switches the switching element to operate AC conversion circuit 30, converts DC power, and outputs AC power to outlet OLT. Therefore, AC power can be output from the outlet OLT provided in the vehicle C to the home appliance or the like while the battery BAT of the vehicle C is being charged from the external power source PWR.

  Further, when the rectifier circuit 11 is not connected to the AC power of the external power supply PWR, the charger 100B causes the power of the battery BAT to be supplied to the outlet OLT. In this case, as indicated by the alternate long and short dash line, the AC conversion circuit 30 receives power from the battery BAT via the DC voltage conversion unit 21 that is a part of the DC conversion circuit 20, and outputs AC power.

  As can be seen from the above description, the direct current voltage between the direct current voltage conversion unit 21 and the smoothing unit 22 input to the alternating current conversion circuit 30 receives direct current from the external power supply PWR and passes through the power factor correction circuit 10 to direct current. The DC voltage output from the voltage converter 21 or the DC voltage output from the DC voltage converter 21 upon receiving power from the battery BAT.

  In the case of the present embodiment, when the minimum voltage of the battery BAT is larger than the output voltage of the outlet OLT, the direct current voltage between the direct current voltage conversion unit 21 and the smoothing unit 22 input to the alternating current conversion circuit 30 is It is larger than the peak voltage output from the outlet OLT. For example, when an AC voltage of 100V is output from the outlet OLT, the peak voltage is 141V. Therefore, the DC voltage output from the DC voltage converter 21 via the power factor correction circuit 10 that receives power from the external power supply PWR and the DC voltage output from the DC voltage converter 21 that receives power from the battery BAT are: If it is 141 V or higher, it is only necessary to perform step-down conversion in order to output 100 V to the outlet OLT. Therefore, it is sufficient that the AC conversion circuit 30 performs step-down conversion.

  On the other hand, when the direct current voltage between the direct current voltage conversion unit 21 and the smoothing unit 22 is less than the peak voltage, a booster circuit may be necessary. However, when the DC voltage conversion unit 21 receives power from the battery BAT and outputs it, the AC conversion circuit 30 boosts the voltage appropriately and outputs an AC current. When the DC voltage conversion unit 21 receives electric power from the external power supply PWR and outputs it via the power factor correction circuit 10, the AC conversion circuit 30 appropriately boosts and outputs an AC current. By connecting at this direct current potential, the loss is less with a stable potential than in the fourth embodiment described later.

<Fourth embodiment>
With reference to FIG. 7 and FIG. 8, the charger 100C in a present Example is demonstrated. In addition, in order to avoid duplication description, the same code | symbol is attached | subjected to the same part as the said Example, and it demonstrates centering on a different part. The charger 100C includes a power factor correction circuit 10 having a rectifier circuit 11 connected to AC power of an external power supply PWR, a DC conversion circuit 20C having one end connected to the power factor improvement circuit 10 and the other end connected to the battery BAT. And AC conversion circuit 30C that receives power and outputs AC power. In the figure, the external power supply PWR, the power factor correction circuit 10, and the like are omitted.

  The DC conversion circuit 20C is a so-called bidirectional DC / DC converter that includes a transformer and converts a DC voltage input from the power factor correction circuit 10 into a predetermined stable DC voltage by switching a switching element. The DC conversion circuit 20C has a DC voltage conversion unit 21C on the side to which power is input and a smoothing unit 22 on the side to output the power. The DC voltage conversion unit 21C converts the input DC voltage into a predetermined DC voltage by switching the switching elements of the full bridge circuit arranged on both sides of the transformer. The smoothing unit 22 removes a pulsating component from the DC voltage converted by the DC voltage conversion unit 21C and outputs a stable DC voltage.

  The transformer part of the DC voltage conversion unit 21C is configured to be magnetically coupled to a transformer part of an AC conversion circuit 30C described later. In this figure, the transformer part of the DC voltage conversion unit 21C is configured to accept the transformer part of the AC conversion circuit 30C at the primary side position (on the left side in the figure), but is not limited to this. It may be configured such that it can be received at the next position (on the right side in the drawing).

  The AC conversion circuit 30C is electrically connected in the above-described embodiment, but one end is connected as a transformer by magnetic coupling in the DC voltage conversion unit 21C. That is, the AC conversion circuit 30C has a winding that is magnetically coupled to the winding of the transformer of the DC voltage conversion unit 21C, and the winding is incorporated into the transformer in the DC voltage conversion unit 21C, so that the DC voltage conversion unit 21 To be magnetically connected. Note that the winding ratio of the transformer of the AC conversion circuit 30C with respect to the primary winding may be any of step-up / step-down / same ratio. The AC conversion circuit 30C receives an AC voltage generated by electromagnetic induction of the transformer of the DC voltage conversion unit 21C, rectifies it, and switches the switching element of the full bridge circuit, so that the AC power is supplied to the outlet OLT. Convert to compatible AC power.

  FIG. 8 shows a current flow in the charger 100C. As shown in FIG. 8, when the rectifier circuit 11 is connected to the AC power of the external power supply PWR, the power factor correction circuit 10 outputs a DC voltage. Therefore, the switching element is switched to operate the DC converter circuit 20C. , DC power is output to the battery BAT and charged. In addition, since electromagnetic induction occurs as a primary side in the transformer of the DC voltage conversion unit 21C, an electromotive force is generated in the transformer of the AC conversion circuit 30C, and AC power is generated in the AC conversion circuit 30C. Based on the AC power, the AC conversion circuit 30C switches the switching element to operate the AC conversion circuit 30C, and outputs AC power suitable for the outlet OLT. Therefore, AC power can be output from the outlet OLT provided in the vehicle C to the home appliance or the like while the battery BAT of the vehicle C is being charged from the external power source PWR.

  In addition, when the rectifier circuit 11 is not connected to AC power, the charger 100C causes the power of the battery BAT to be supplied to the outlet OLT. In this case, as indicated by an alternate long and short dash line, an electromotive force is generated in the transformer of the AC conversion circuit 30C due to electromagnetic induction of the transformer in the DC voltage conversion unit 21C, and AC power is generated in the AC conversion circuit 30C. Based on the AC power, the AC conversion circuit 30C switches the switching element to operate the AC conversion circuit 30C, and outputs AC power suitable for the outlet OLT.

  As can be seen from the above description, the AC voltage input to the AC conversion circuit 30C via the transformer receives the power from the external power supply PWR and passes through the power-factor correction circuit 10 and the primary side transformer in the DC voltage conversion unit 21. The AC voltage that has passed through or the AC voltage that has received power from the battery BAT and passed through the primary transformer in the DC voltage converter 21. Therefore, in any case, since the AC voltage passes through the primary transformer in the DC voltage converter 21 and the switching circuit in the AC converter circuit 30C exists, an AC voltage suitable for the outlet OLT is output as appropriate.

  The AC conversion circuit 30C is magnetically connected (magnetically coupled) as a transformer inside the DC voltage conversion unit 21C. That is, the AC conversion circuit 30C receives power from the external power supply PWR or the battery BAT via a part of the DC conversion circuit 20 (primary circuit of the DC voltage conversion unit 21C), and outputs AC power. According to this, by connecting at the location of this alternating potential, not only electrical connection as in the above embodiment but also magnetic connection can be established, and a flexible connection form can be provided. it can.

<Summary>
As is apparent from the description of the first to fourth embodiments described above, the AC conversion circuit (30, 30A to C) is provided between the capacitor 13 and the power factor control circuit 12 in the power factor correction circuit 10. , And electromagnetically connected to any position between the DC voltage conversion unit (21, 21C) and the smoothing unit 22. That is, in the first embodiment, the AC conversion circuit 30 is electrically connected between the power factor correction circuit 10 and the DC conversion circuit 20, and in the second embodiment, the capacitor 13 and the force in the power factor improvement circuit 10 are connected. In the third embodiment, it is electrically connected between the DC voltage conversion unit 21 and the smoothing unit 22 in the DC conversion circuit 20, and in the fourth embodiment, the DC control circuit 12 The voltage converter 21C is magnetically connected as a transformer. By making such a connection, it is possible to provide a charger in which duplication of a circuit corresponding to a DC conversion circuit is reduced or eliminated.

  Further, when the rectifier circuit 11 is not connected to the AC power of the external power supply PWR, the AC converter circuit (30, 30A to C) is connected to the battery BAT via at least a part of the DC converter circuit (21, 21C). Power is input and AC power is output.

  In addition, this invention is not limited to the illustrated Example, The implementation by the structure of the range which does not deviate from the content described in each item of a claim is possible. That is, although the present invention has been particularly illustrated and described with respect to particular embodiments, it should be understood that the present invention has been described in terms of quantity, quantity, and amount without departing from the scope and spirit of the present invention. In other detailed configurations, various modifications can be made by those skilled in the art.

DESCRIPTION OF SYMBOLS 100 Charger 10 Power factor improvement circuit 11 Rectifier circuit 12 Power factor control circuit 13 Capacitor 20 DC conversion circuit 21 DC voltage conversion part 22 Smoothing part 30 AC conversion circuit 40 Control part 50 Switch PWR External power supply BAT Battery OLT Outlet C Vehicle

Claims (5)

In the charger that charges the battery,
A power factor correction circuit connected to AC power;
A DC conversion circuit having one end connected to the power factor correction circuit and the other end connected to the battery;
An AC conversion circuit that receives power and outputs AC power; and
A charger comprising:
The power factor improvement circuit has a capacitor on the side connected to the DC conversion circuit and a power factor control circuit on the side connected to the power factor improvement circuit,
The DC conversion circuit has a DC voltage conversion unit on the side where power is input, and a smoothing unit on the side connected to the battery,
The AC conversion circuit is electromagnetically connected to any position between the capacitor and the power factor control circuit and between the DC voltage conversion unit and the smoothing unit.
Charger.   The charger according to claim 1, wherein the AC conversion circuit is electrically connected between the power factor correction circuit and the DC conversion circuit.   The charger according to claim 1, wherein the AC conversion circuit is connected by magnetic coupling in the DC voltage conversion unit.   The power conversion circuit is operated to output DC power when the power factor correction circuit is connected to AC power, and the AC conversion circuit is operated to output AC power. The charger according to any one of 1 to 3.   When the power factor correction circuit is not connected to AC power, the AC conversion circuit receives power from the battery via at least a part of the DC conversion circuit and outputs AC power. The charger according to any one of claims 1 to 3.