JP6008365B2 - Charger - Google Patents

Charger Download PDF

Info

Publication number
JP6008365B2
JP6008365B2 JP2012194981A JP2012194981A JP6008365B2 JP 6008365 B2 JP6008365 B2 JP 6008365B2 JP 2012194981 A JP2012194981 A JP 2012194981A JP 2012194981 A JP2012194981 A JP 2012194981A JP 6008365 B2 JP6008365 B2 JP 6008365B2
Authority
JP
Japan
Prior art keywords
converter
non
insulated
charging device
isolated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2012194981A
Other languages
Japanese (ja)
Other versions
JP2014053992A (en
Inventor
芳賀 浩之
浩之 芳賀
Original Assignee
新電元工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 新電元工業株式会社 filed Critical 新電元工業株式会社
Priority to JP2012194981A priority Critical patent/JP6008365B2/en
Publication of JP2014053992A publication Critical patent/JP2014053992A/en
Application granted granted Critical
Publication of JP6008365B2 publication Critical patent/JP6008365B2/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Images

Description

  The present invention relates to a charging device including a non-isolated converter that receives an AC power supply and an insulating converter that receives an output of the non-isolated converter.

  FIG. 4 is an example of a circuit diagram showing a conventional charging device. This charging device is composed of two converters, a non-insulated converter 1 having a power factor improving function and a converter 2 having an insulating function (hereinafter referred to as “insulated converter”).

  The non-insulated converter 1 is a converter having a function of making the input power factor approximately 1 by keeping the output voltage constant, making the input current waveform similar to the input voltage waveform, and matching both phases. is there. In many cases, a step-up chopper having a small input ripple current is used.

  The conventional non-insulated converter 1 of the charging device exemplified in FIG. 4 is a step-up chopper type power factor correction converter. Specifically, it has a bridge diode composed of four diodes 31 to 34, the AC terminal of this bridge diode is connected to the AC power supply 4, and the DC terminal on the anode side is connected to one end of the switch element 21. At the same time, it is connected to one input terminal of the insulating converter 2. Further, the DC terminal on the cathode side is connected to one end of the choke 51. The other end of the choke 51 is connected to the other end of the switch element 21 and to the anode of the diode 35. The cathode of the diode 35 is connected to the other input terminal of the insulating converter 2 and is connected to one end of the electrolytic capacitor 11. The other end of the electrolytic capacitor 11 is connected to one input terminal of the insulating converter 2. The diodes 31 to 35 are examples of rectifying elements, and other rectifying elements may be used. Although the MOSFET is shown in FIG. 4 as the switch element 21, other switch elements may be used.

  The isolated converter 2 in FIG. 4 is a converter having a function of receiving DC power output from the non-insulated converter 1 and outputting it as power for charging the battery 5 after being insulated. In a charging device of several kW class, a full bridge converter is often used.

  The insulation type converter 2 given as an example in FIG. 4 is a full bridge type converter. Specifically, the side connected to the non-insulated converter 1 via the transformer 60 is a primary side, and the side connected to the battery 5 is a secondary side. On the primary side, four switch elements 22 to 25 constitute a full bridge circuit, and the primary winding of the transformer 60 is connected to the AC terminal of the full bridge circuit. The secondary winding of the transformer 60 of the isolated converter 2 is connected to an AC terminal of a bridge diode composed of four diodes 36 to 39, and the DC terminal of the bridge diode is an LC filter composed of a choke 52 and a capacitor 12. It is connected to the input and its output is connected to the battery 5. The diodes 36 to 39 are examples of rectifying elements, and other rectifying elements may be used. Further, although MOSFETs are shown in FIG. 4 as the switch elements 22 to 25, other switch elements may be used.

  By combining these two converters, it is possible to realize a charging device that can charge the battery with the power insulated from the AC input while improving the power factor of the input to approximately 1.

JP 7-123710 A JP 2002-514378 gazette Japanese Patent Laid-Open No. 2001-103585 JP 2002-514378 gazette

  However, the conventional charging device has a problem that an electrolytic capacitor having a large capacitance is required. This is because the non-insulated converter 1 generates DC power from a low frequency AC commercial power supply system such as 50 Hz or 60 Hz.

  As already described, the non-insulated converter 1 makes the input current waveform similar to the input voltage waveform and matches the phases of both. Therefore, the input current waveform becomes a sine wave, and a part of the waveform obtained by full-wave rectification is charged in the electrolytic capacitor. For this reason, the charging current of the electrolytic capacitor contains many components twice the commercial frequency.

Even when charged with such a current, the impedance of the electrolytic capacitor needs to be sufficiently low in this frequency band in order to maintain a DC voltage without appearing as a large ripple voltage component twice the commercial frequency. The impedance z of the capacitor can be expressed by Equation 1 below, where f is the frequency and C is the capacitance.
Therefore, when the frequency f is small, the impedance z must be reduced by increasing the capacitance C. This is the reason why the non-insulated converter 1 requires a capacitor having a large capacitance C.

  Since this large-capacity electrolytic capacitor occupies a large volume, there arises a problem that the charging device cannot be reduced in size. An object of this invention is to provide the charging device which solved the above conventional subjects.

  A charging device according to a first aspect of the present invention includes a first non-insulated converter that receives an AC power supply as an input, an isolated converter that receives an output of the first non-insulated converter, and the insulation And a battery connected to the output of the mold converter.

In such a charging device of the first invention, the first non-insulated converter includes a choke and a switch element, and the isolated converter includes a transformer and a plurality of primary side switch elements.
Further, the first non-insulated converter and the isolated converter do not include an electrolytic capacitor for smoothing AC power, and the isolated converter does not include a function for adjusting a voltage.

  A charging device according to a second aspect of the present invention includes a first non-insulated converter that receives an AC power supply, an isolated converter that receives an output of the first non-insulated converter, and an output of the isolated converter. A second non-insulated converter as an input; and a battery connected to the output of the second non-insulated converter.

In such a charging device of the second invention, the first non-insulated converter has a choke and a switching element, the insulating converter has a transformer and a plurality of primary side switching elements, and the second non-insulating The type converter has a capacitor, a choke and a switch element.
In addition, the first non-insulated converter, the isolated converter, and the second non-insulated converter do not include an electrolytic capacitor that smoothes AC power, and the isolated converter includes a function for adjusting the voltage. Not.

  According to a third aspect of the present invention, there is provided a charging apparatus according to the first or second aspect, wherein there is no period in which all the primary side switch elements of the isolated converter are simultaneously turned off.

  According to a fourth aspect of the present invention, there is provided a charging device according to the first or second aspect, wherein the first non-insulated converter is the first non-insulated converter during a period in which all the primary side switching elements of the isolated converter are turned off. The output current is set to zero.

  A charging device of a fifth invention is the charging device of the first, second, third, or fourth invention, wherein the first non-insulated converter has a power factor improving function.

  A charging device of a sixth invention is the charging device of the fifth invention, wherein the first non-insulated converter is a step-up chopper type power factor correction converter.

  A charging device according to a seventh aspect is the charging device according to the first, second, third, fourth or fifth aspect, wherein the insulating converter is a full bridge converter.

  A charging device according to an eighth invention is the charging device according to the seventh invention, wherein the isolated converter includes a capacitor connected in series with the primary winding of the transformer, and the capacitor continues in a specific direction when the operation is stopped. Charged.

  The charging device of the present invention has the following four effects.

First, since a large-capacity electrolytic capacitor occupying a large volume is not necessary, the charging device can be miniaturized.
Second, since a means for precharging the electrolytic capacitor is not required, the charging device can be reduced in size. In the conventional charging device, when the AC power supply 4 is connected, a pre-charging means (not shown) is required to prevent a large current from flowing through the electrolytic capacitor and damaging the parts. In the charging device of the present invention, since there is no electrolytic capacitor in the first place, there is no means for precharging it.

  Third, by adding a capacitor 13 connected in series with the primary winding of the transformer to the isolated converter 2, an emergency stop can be achieved even when the input / output voltage of the non-isolated converter 1 cannot satisfy the boosting condition. Can do.

  Fourth, by inserting the non-insulated converter 3, even if the input voltage or battery voltage fluctuates significantly, the boost condition of the non-insulated converter 1 can be satisfied, and distortion of the input current waveform is suppressed. I can do it.

FIG. 1 is a circuit diagram showing a charging apparatus according to Embodiment 1 of the present invention. FIG. 2 is a circuit diagram showing a charging apparatus according to Embodiment 2 of the present invention. FIG. 3 is a circuit diagram showing a specific example of the charging device according to the second embodiment of the present invention. FIG. 4 is a circuit diagram showing a conventional charging apparatus. FIG. 5 is a waveform example of a distorted input current. FIG. 6 is a circuit diagram showing a charging apparatus according to Embodiment 4 of the present invention. FIG. 7 is a circuit diagram for explaining a control function as a converter having a power factor improving function of the charging device according to the fourth embodiment of the present invention. FIG. 8 is a circuit diagram showing a charging apparatus according to Embodiment 5 of the present invention. FIG. 9 is an example of a drive signal pattern for realizing the sixth embodiment of the present invention. FIG. 10 is an example of a drive signal pattern for realizing the seventh embodiment of the present invention. FIG. 11 is a circuit diagram showing a charging apparatus according to Embodiment 8 of the present invention. FIG. 12 is an example of a circuit diagram showing Embodiment 9 of the present invention. FIG. 13 is another example of a circuit diagram showing Embodiment 9 of the present invention.

  The mode for carrying out the present invention will be apparent from the following description of the preferred embodiments when read with reference to the accompanying drawings. However, the drawings are only for explanation and do not limit the scope of the present invention.

(Configuration of Example 1)
FIG. 1 is a circuit diagram showing a charging device in Embodiment 1 of the present invention.
This charging apparatus includes a non-insulated converter 1 that receives an AC power supply 4, an isolated converter 2 that receives an output of the non-isolated converter 1, a battery 5 connected to the output of the isolated converter 2, It has.
The non-insulated converter 1 has a choke and a switch element, and the isolated converter 2 has a transformer and a plurality of primary side switch elements.
In such a charging device of the first invention, the non-insulated converter 1 and the isolated converter 2 do not include an electrolytic capacitor for smoothing AC power, and the isolated converter 2 has a function of adjusting a voltage. Not included.

(Operation of Example 1)
The operation of the charging device in FIG. 1 will be described.
Since the battery 5 is connected to the output of the isolated converter 2, the output voltage is direct current. Further, the isolated converter 2 includes a transformer for insulation. The isolated converter 2 does not include a function for adjusting the voltage. Since the voltage cannot be adjusted, a DC voltage obtained by converting the output voltage by the turns ratio of the transformer appears at the input of the isolated converter 2.

  Therefore, although the non-insulated converter 1 does not include an electrolytic capacitor that smoothes AC power, its output voltage is a DC voltage. Therefore, the operation can be established with the same voltage waveform as that of a conventional converter including an electrolytic capacitor for smoothing AC power.

(Effect of Example 1)
According to the charging device of the first embodiment, the non-insulated converter 1 is a conventional non-insulated converter including an electrolytic capacitor that smoothes AC power, even though the electrolytic capacitor that smoothes AC power is not included. The operation can be established with the same voltage waveform. This eliminates the need for a large-capacity electrolytic capacitor that occupies a large volume, and thus enables a reduction in the size of the charging device.

(Configuration of Example 2)
FIG. 2 is a circuit diagram illustrating a charging device according to a second embodiment of the present invention. Elements common to those in FIG. 1 illustrating the charging device according to the first embodiment are denoted by common reference numerals.
This charging device includes a first non-insulated converter 1 that receives an AC power supply 4, an isolated converter 2 that receives an output of the first non-isolated converter 1, and an output of the isolated converter 2. The second non-insulated converter 3 and a battery 5 connected to the output of the second non-insulated converter 3 are provided.
The first non-insulated converter 1 has a choke and a switch element, the isolated converter 2 has a transformer and a plurality of primary side switch elements, and the second non-insulated converter 3 has a capacitor, a choke and a switch element. Have.
In such a charging device of the second invention, the first non-insulating converter 1, the insulating converter 2, and the second non-insulating converter 3 do not include an electrolytic capacitor for smoothing AC power, The isolated converter 2 does not include a function for adjusting the voltage.

(Operation of Example 2)
The difference between the first embodiment and the second embodiment is that a second non-insulated converter 3 is added between the isolated converter 2 and the battery 5.
In general, a converter with a power factor correction function often uses a step-up chopper with a characteristic that the input ripple current is small, but in this type of converter, if the output voltage is not maintained higher than the input voltage, There is a problem that the input current cannot be controlled and the input current waveform is distorted. An example of a distorted waveform is shown in FIG.

  For this reason, when the non-insulated converter 1 is a step-up chopper type power factor correction converter, when the input voltage of the charging device greatly fluctuates or the battery voltage fluctuates greatly, the charging device of the first embodiment Since it is difficult to maintain a state where the output voltage of the non-insulated converter 1 is higher than the input voltage, there may be a problem that the input current waveform is distorted.

  This problem can be solved by adding a non-insulated converter 3 and having a function of adjusting the voltage. In the second embodiment, the output voltage of the isolated converter 2 is not fixed by the battery voltage and can be adjusted by the non-isolated converter 3, so that the output voltage of the non-isolated converter 1 is maintained higher than the input voltage depending on the situation. It is possible to do.

  A specific example of the non-insulated converter 3 is shown in FIG. Elements common to the elements in FIG. 2 showing the charging apparatus according to the second embodiment are denoted by common reference numerals. A capacitor 10 is connected to the input of the non-insulated converter 3, a series circuit of a switch element 20 and a diode 30 is connected in parallel with the capacitor 10, and an anode of the diode 30 is connected to one end of the capacitor 10. Yes. One end of a choke 50 is connected to the cathode of the diode 30, and one end of the battery 5 is connected to the other end of the choke 50. The anode of the diode 30 is connected to the other end of the battery 5.

The non-insulated converter 3 configured as shown in FIG. 3 is generally called a step-down chopper, and it is known that the output voltage is equal to or lower than the input voltage. That is, assuming that the voltage of the capacitor 10 is Vin, the voltage of the battery 5 is Vout, the on-time of the switch element 20 is Ton, and the off-time of the switch element 20 is Toff, in a steady state where the current of the choke 50 is continuous, The following relationship holds.
Therefore, by adjusting Ton and Toff, it is possible to adjust the output voltage of the isolated converter 2, that is, the voltage Vin of the capacitor 10 to a voltage higher than the voltage Vout of the battery 5. Since this voltage is converted by the turns ratio of the transformer of the isolated converter 2 and appears in the input voltage of the isolated converter 2, that is, the output voltage of the non-insulated converter 1, the voltage of the AC power supply 4 is high and the voltage of the battery 5 is Even when the voltage is low, the output voltage of the non-insulated converter 1 can be maintained higher than the input voltage.

(Effect of Example 2)
According to the charging device of the second embodiment, in addition to the effects of the first embodiment, the input current waveform is not distorted even when the input voltage of the charging device fluctuates significantly or when the battery voltage fluctuates significantly. Can be controlled.

(Configuration of Example 3)
The charging device according to the third embodiment is characterized in that, in the charging device according to the first or second embodiment, the non-insulated converter 1 has a power factor improving function.

(Operation of Example 3)
Converters with a power factor correction function generally have a function to make the input power factor approximately 1 by keeping the output voltage constant and making the input current waveform similar to the input voltage waveform and matching the phases of both. Is a converter with As described in the operation of the first embodiment, the charging device of the present embodiment does not have the function of adjusting the voltage of the isolated converter 2, so that the direct current voltage of the battery is converted to the turn ratio, and the non-insulated converter 1 Since it appears in the output, the non-insulated converter 1 does not need to have a function of keeping the output voltage constant, and only needs to have a function of making the input current waveform similar to the input voltage waveform and matching the phases of the two.

However, there is a problem that the target value of the input current cannot be determined by itself. This can be solved by keeping the charging current of the battery 5 constant instead of keeping the output voltage of the non-insulated converter 1 constant. Since the charging current of the battery 5 has a frequency component twice the commercial frequency, it is the average value of the charging current of the battery 5 that is kept constant.
Specific examples will be described in detail in Example 4.

(Effect of Example 3)
Since the power factor of the input can be made almost 1, equipment capacity can be used effectively.

(Configuration of Example 4)
The charging apparatus according to the fourth embodiment is characterized in that, in the charging apparatus according to the third embodiment, the non-insulated converter 1 is a step-up chopper type power factor correction converter.
FIG. 6 is a circuit diagram showing a charging apparatus according to Embodiment 4 of the present invention. Elements common to those in FIG. 4 showing a conventional charging apparatus are denoted by common reference numerals. Specifically, it has a bridge diode composed of four diodes 31 to 34, the AC terminal of this bridge diode is connected to the AC power supply 4, and the DC terminal on the anode side is connected to one end of the switch element 21. At the same time, it is connected to one input terminal of the insulating converter 2. Further, the DC terminal on the cathode side is connected to one end of the choke 51. The other end of the choke 51 is connected to the other end of the switch element 21 and to the anode of the diode 35. The cathode of the diode 35 is connected to the other input terminal of the isolated converter 2, and the output terminal of the isolated converter 2 is connected to the battery 5. The feature of the present invention is that the electrolytic capacitor 11 is not provided. The diodes 31 to 35 are examples of rectifying elements, and other rectifying elements may be used.

  FIG. 7 is a circuit diagram for explaining a control function as a power factor correction converter of the charging device in Embodiment 4 of the present invention, and elements 70 to 79 are added. The specific configuration will be described together with the operation description.

(Operation of Example 4)
In the charging device according to the fourth embodiment of the present invention, the current detection unit 77 is provided between the negative terminal of the battery 5 and the other output terminal of the isolated converter 2, and the battery 5 detected by the current detection unit 77 is provided. The charging current is passed through the low-pass filter 78 to obtain an average value, and the difference between the value and the target charging current calculation means 79 is amplified by the error amplification means 76. The error amplification signal obtained by the error amplification means 76 and the input detected by the voltage detection means 70 provided between the anode-side DC terminal and the cathode-side DC terminal of the bridge diode constituting the non-insulated converter 1. The multiplication means 75 multiplies the waveform obtained by full-wave rectification of the voltage. The difference between the output of the multiplier 75 and the waveform obtained by full-wave rectifying the input current detected by the current detector 72 provided between the DC terminal on the anode side of the bridge diode and the other input terminal of the isolated converter 2 is obtained. Then, the signal is amplified by the error amplifying means 73, and the obtained error amplified signal is converted into a pulse voltage through the modulating means 74, and then supplied to the driving means 71 to drive the switch element 21.

  Thus, it is possible to make the input current waveform similar to the input voltage waveform and match the phases of the two while matching the average value of the charging current of the battery 5 with the target charging current.

(Effect of Example 4)
Since the power factor of the input can be made almost 1, equipment capacity can be used effectively.

(Configuration of Example 5)
The charging device according to the fifth embodiment is characterized in that, in the charging device according to the first embodiment, the second embodiment, the third embodiment, or the fourth embodiment, the isolated converter 2 is a full-bridge converter.
FIG. 8 is a circuit diagram showing a charging apparatus according to Embodiment 5 of the present invention. Elements common to those in FIG. 4 showing a conventional charging apparatus are denoted by common reference numerals.

  In the isolated converter 2 of the charging device of the fifth embodiment, the side connected to the non-insulated converter 1 via the transformer 60 is a primary side, and the side connected to the battery 5 is a secondary side. On the primary side, four switch elements 22 to 25 constitute a full bridge circuit, and the primary winding of the transformer 60 is connected to the AC terminal of the full bridge circuit. The secondary winding of the transformer 60 of the isolated converter 2 is connected to an AC terminal of a bridge diode composed of four diodes 36 to 39, and the DC terminal of the bridge diode is connected to the battery 5. The diodes 36 to 39 are examples of rectifying elements, and other rectifying elements may be used.

(Operation of Example 5)
In order to realize that the primary side is a general full-bridge converter but the function of adjusting the voltage, which is a requirement of the isolated converter 2 of the present invention, is not included, the choke 52 and the capacitor constituting the LC filter 12 is deleted, and the battery 5 is connected to the output of the rectifier circuit composed of the diodes 36 to 39.

  Therefore, when the diode 36 and the diode 39 or the diode 37 and the diode 38 are brought into conduction, the secondary winding voltage of the transformer 60 and the voltage of the battery 5 become equal. Therefore, the primary winding voltage of the transformer 60 becomes a battery voltage converted by the turn ratio of the transformer 60, and the switch element 23 and the switch element 24 having a hanging relationship, or the switch element 22 and the switch element 25 having a hanging relationship. Are electrically connected to each other, and the input voltage of the isolated converter 2 becomes the voltage of the battery 5 converted by the turn ratio of the transformer 60.

(Configuration of Example 6)
The charging device according to the sixth embodiment is characterized in that the isolated converter 2 operates so that there is no period in which all the primary side switching elements are simultaneously turned off. As an example in which the isolated converter 2 operates so that there is no period in which all the primary side switching elements are simultaneously turned off, a description will be given using the circuit of FIG. 8 showing the charging device in Embodiment 5 of the present invention. The charging apparatus according to the sixth embodiment can be realized by the drive signal pattern shown in FIG.

(Operation of Example 6)
Since the charging device of Example 1, Example 2, Example 3, Example 4, or Example 5 does not include an electrolytic capacitor that smoothes AC power, the power is temporarily stored therein. I can't. Therefore, when all the primary side switching elements of the isolated converter 2 are turned off when the output current of the non-isolated converter 1 is not zero, the input impedance of the isolated converter 2 becomes high impedance. There is a problem that the input voltage becomes high and the primary side switching element of the isolated converter 2 is damaged.

  A solution to this problem is to operate such that there is no period in which all the primary side switch elements of the isolated converter 2 are simultaneously turned off. A specific example is shown in FIG. The drive signal pattern in FIG. 9 has three states (1), (2), and (3). Here, (1) is a state where all the switch elements 22 to 25 are turned on, (2) is a state where the switch elements 22 and 25 are turned on, and (3) is a state where the switch elements 23 and 24 are turned on. It is in a state of being. (1) is unnecessary in principle, but is included in order to prevent a situation in which all of the switch elements 22 to 25 are turned off due to timing variations.

(Effect of Example 6)
In the charging device according to the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, or the fifth embodiment, the insulated converter 2 can be safely operated without being damaged.

(Configuration of Example 7)
The charging device according to the seventh embodiment is characterized in that the output current of the non-insulated converter 1 becomes zero during a period in which all the primary side switching elements of the isolated converter 2 are turned off. FIG. 8 shows a charging apparatus according to Embodiment 5 of the present invention as an example of operating so that the output current of the non-insulated converter 1 becomes zero during the period when all the primary side switching elements of the isolated converter 2 are turned off. This will be explained using the circuit of. The charging device according to the seventh embodiment can be realized by the drive signal pattern shown in FIG.

(Operation of Example 7)
As described above in the description of the sixth embodiment, the charging device of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, or the fifth embodiment does not include an electrolytic capacitor that smoothes AC power. Power cannot be temporarily stored internally. Therefore, when all the primary side switching elements of the isolated converter 2 are turned off when the output current of the non-isolated converter 1 is not zero, the input impedance of the isolated converter 2 becomes high impedance. There is a problem that the input voltage becomes high and the primary side switching element of the isolated converter 2 is damaged.

  Another solution to this problem is to operate so that the output current of the non-insulated converter 1 becomes zero during the period when all the primary side switching elements of the isolated converter 2 are turned off. A specific example is shown in FIG. Focusing on on and off of the switch elements 22 to 25, there are two states (1) and (2) in the drive signal pattern of FIG. Here, (1) is a state in which the switch element 22 and the switch element 25 are turned on, and (2) is a state in which the switch element 23 and the switch element 24 are turned on. When (1) and (2) are switched, there is a possibility that all of the switch elements 22 to 25 are turned off due to timing variations. This state is when the switch element 21 is turned on, that is, non-switched. It is set so that the output current of the isolated converter 1 becomes zero.

(Effect of Example 7)
In the charging device according to the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, or the fifth embodiment, the insulated converter 2 can be safely operated without being damaged.

In general, the method of zeroing the current in advance before the switch element is turned on and off is called zero current switching, which improves efficiency by eliminating switching loss and eliminates high-frequency voltage / current oscillation that occurs when the voltage / current switches. It is known that low noise can be realized.
In the above specific example, since the switch elements 22 to 25 are turned on and off when the output current of the non-insulated converter 1 becomes zero, zero current switching can be realized.

(Configuration of Example 8)
The charging device according to the eighth embodiment includes the capacitor 13 connected in series with the transformer 60 in the isolated converter 2 in the charging device according to the fifth embodiment. When the operation is stopped, the capacitor 13 is continuously in a specific direction. It is characterized by the fact that it is charged.

(Operation of Example 8)
As described in the description of the second embodiment, the non-insulated converter 1 is a step-up chopper type power factor correction converter, and the input is performed when the input voltage of the charging device greatly fluctuates or the battery voltage fluctuates greatly. There is a problem that the current waveform is distorted. The distortion occurs because the input current cannot be controlled unless the output voltage of the non-insulated converter 1 is maintained higher than the input voltage. The reason why the input current cannot be controlled is that, even if the switch element 21 of the non-insulated converter 1 is turned on or off, energy is stored in the choke 51 of the non-insulated converter 1 and cannot be released. This is because the input current cannot be reduced.

  If the input current cannot be reduced, not only will the input current waveform be distorted, but there will also be a problem that the emergency stop cannot be performed. In the charging device of the present invention, when all the primary side switching elements 22 to 25 of the isolated converter 2 are turned off when the output current of the non-insulated converter 1 is not zero, the input impedance of the isolated converter 2 becomes high impedance. Therefore, there is a problem that the input voltage of the isolated converter 2 becomes a high voltage, and the primary side switch elements 22 to 25 of the isolated converter 2 are damaged. And since it does not have the electrolytic capacitor which stores electric power temporarily, the electric power input into the non-insulated converter 1 is output immediately. Therefore, in a situation where the input current cannot be reduced, the output current of the non-insulated converter 1 cannot be made zero, and therefore the isolated converter 2 cannot be stopped.

  On the other hand, when the user of the charging device detects that the cable has been disconnected in order to suppress the occurrence of an arc when the cable is forcibly disconnected during charging, the input current is reduced to zero in a short time as much as possible. It is required for the charging device. However, in a situation where the input current cannot be reduced, an emergency stop cannot be performed, so that an arc is generated when the cable is forcibly pulled out during charging, causing a problem for the user of the charging apparatus.

(Effect of Example 8)
As shown in FIG. 11, the capacitor 13 is inserted in series with the primary winding of the transformer 60 as shown in FIG. 11, and the switch element 23 and the switch element 24 or the switch element 22 and the switch are turned off while the switch element 21 is turned off at the time of emergency stop. This can be avoided by turning on the element 25 continuously.
This is a method of utilizing the fact that the capacitor 13 inserted in series with the primary winding of the transformer 60 has a voltage so that the apparent battery voltage becomes a true battery voltage + capacitor voltage. Thereby, the boosting condition is satisfied, and the input current of the non-insulated converter 1 can be reduced.

  In a normal operation other than an emergency stop, the switch element 23 and the switch element 24 are not continuously turned on, but the switch element 23 and the switch element 24 and the switch element 22 and the switch element 25 are alternately turned on. 13 repeats charging and discharging and does not have a large voltage. Therefore, the capacitor 13 does not interfere with normal operation.

  Although the example in which the isolated converter 2 is a full bridge converter has been described as the fifth embodiment, other circuit systems can be applied.

  For example, even if the insulated converter 2 is replaced with a push-pull converter as shown in FIG. 12, the same effect as described above can be obtained. The switch elements 24 and 25 on the primary side of the isolated converter 2 in this embodiment can use the drive signal patterns of the switch elements 24 and 25 in the sixth embodiment. Further, the switch element 21 of the non-insulated converter 1 and the switch element 24 and the switch element 25 on the primary side of the isolated converter 2 in this embodiment are the same as the switch element 21, the switch element 24, and the switch element 25 in the seventh embodiment, respectively. The drive signal pattern can be used.

  As another example, even if the insulated converter 2 is combined with two forward converters as shown in FIG. 13, the same effect as described above can be obtained. Also in this embodiment, as in the embodiment using the push-pull converter, the switch element 24 and the switch element 25 on the primary side of the isolated converter 2 are the same as the switch element 24 and the switch element 25 in the embodiment 6, respectively. A drive signal pattern can be used. Further, the switch element 21 of the non-insulated converter 1 and the switch element 24 and the switch element 25 on the primary side of the isolated converter 2 in this embodiment are the same as the switch element 21, the switch element 24, and the switch element 25 in the seventh embodiment, respectively. The drive signal pattern can be used.

  In any of the embodiments, the number of primary side switch elements in the isolated converter 2 is an even number. However, the number of primary side switch elements in the present invention is not limited to an even number as long as there are a plurality of primary side switch elements. For example, if an odd number of forward converters are combined in FIG. 13, the number of primary side switching elements is an odd number.

  In addition, there exists a flyback converter of patent document 1 as a power factor improvement converter which does not contain an electrolytic capacitor. This is because the primary side circuit does not include an electrolytic capacitor, but the secondary side circuit requires an electrolytic capacitor, which is different from the present invention.

  Further, Patent Document 2 discloses a technique called an intermediate bus architecture that constructs a system by combining a non-insulated chopper called PoL and an insulated uncontrolled converter called a bus converter. Intended for direct current output systems, direct current output is produced by a non-insulated chopper. The present invention is directed to an AC input charging device, which uses a DC voltage of a battery to convert the output of the non-insulated converter 1 to a DC voltage, which is different from Patent Document 2.

  Patent Document 3 discloses a technique of a charging device that does not have an electrolytic capacitor, but this is different from the present invention in that it is a system composed of a single converter.

DESCRIPTION OF SYMBOLS 1 Non-isolated converter 2 Insulated converter 3 Non-insulated converter 4 AC power supply 5 Battery 10 Capacitor 11 Electrolytic capacitor 12 Capacitor 13 Capacitor 20 Switch element 21 Switch element 22 Switch element 23 Switch element 24 Switch element 25 Switch element 30 Diode 31 Diode 32 diode 33 diode 34 diode 35 diode 36 diode 37 diode 38 diode 39 diode 50 choke 51 choke 52 choke 60 transformer 61 transformer 70 voltage detection means 71 drive means 72 current detection means 73 error amplification means 74 modulation means 75 multiplication means 76 error amplification Means 77 Current detection means 78 Low-pass filter 79 Target charging current calculation means

Claims (8)

  1. A first non-insulated converter with an AC power supply as input;
    An isolated converter that receives the output of the first non-insulated converter, and
    A battery connected to the output of the isolated converter;
    In a charging device comprising:
    The first non-insulated converter has a choke and a switching element;
    The isolated converter includes a transformer and a plurality of primary side switching elements, and the first non-insulated converter and the isolated converter include an electrolytic capacitor that smoothes the AC power output from the AC power source. Not
    The charging device according to claim 1, wherein the insulating converter does not include a function of adjusting a voltage.
  2. A first non-insulated converter with an AC power supply as input;
    An isolated converter that receives the output of the first non-insulated converter, and
    A second non-insulated converter having the output of the isolated converter as an input;
    A battery connected to the output of the second non-insulated converter;
    In a charging device comprising:
    The first non-insulated converter has a choke and a switching element;
    The isolated converter has a transformer and a plurality of primary side switching elements,
    The second non-insulated converter includes a capacitor, a choke, and a switching element, and the first non-insulated converter, the isolated converter, and the second non-insulated converter are supplied with alternating current from the AC power source. It does not include an electrolytic capacitor that smooths the power,
    The charging device according to claim 1, wherein the insulating converter does not include a function of adjusting a voltage.
  3. The isolated converter is characterized in that there is no period in which all the primary side switching elements are simultaneously turned off,
    The charging device according to claim 1 or 2.
  4. The output current of the first non-insulated converter is set to zero during a period when all the primary side switching elements of the isolated converter are turned off.
    The charging device according to claim 1 or 2.
  5. The first non-insulated converter has a power factor improving function,
    The charging device according to claim 1, claim 2, claim 3 or claim 4.
  6. The first non-insulated converter is a step-up chopper type power factor correction converter,
    The charging device according to claim 5.
  7. The isolated converter is a full-bridge converter,
    The charging device according to claim 1, claim 2, claim 3, claim 4 or claim 5.
  8. The isolated converter includes a capacitor connected in series with the primary winding of the transformer,
    The capacitor is characterized by having an emergency stop function while being continuously charged in a specific direction.
    The charging device according to claim 7.
JP2012194981A 2012-09-05 2012-09-05 Charger Active JP6008365B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2012194981A JP6008365B2 (en) 2012-09-05 2012-09-05 Charger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2012194981A JP6008365B2 (en) 2012-09-05 2012-09-05 Charger

Publications (2)

Publication Number Publication Date
JP2014053992A JP2014053992A (en) 2014-03-20
JP6008365B2 true JP6008365B2 (en) 2016-10-19

Family

ID=50611964

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2012194981A Active JP6008365B2 (en) 2012-09-05 2012-09-05 Charger

Country Status (1)

Country Link
JP (1) JP6008365B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6515762B2 (en) * 2015-09-25 2019-05-22 住友電気工業株式会社 Power supply
SG11201700428UA (en) * 2016-02-05 2017-09-28 Guangdong Oppo Mobile Telecommunications Corp Ltd Charge method, adapter and mobile terminal
JP6589046B2 (en) * 2016-02-05 2019-10-09 グァンドン オッポ モバイル テレコミュニケーションズ コーポレーション リミテッドGuangdong Oppo Mobile Telecommunications Corp., Ltd. Adapter and charge control method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01117653A (en) * 1987-10-30 1989-05-10 Mitsubishi Electric Corp Power converter
JPH0371218B2 (en) * 1988-02-25 1991-11-12 Sansha Electric Mfg Co Ltd
JP2000224855A (en) * 1999-01-28 2000-08-11 Japan Storage Battery Co Ltd Dc-to-dc converter circuit
US20100181930A1 (en) * 2009-01-22 2010-07-22 Phihong Usa Corp Regulated power supply
JP5509454B2 (en) * 2010-05-27 2014-06-04 ダイヤモンド電機株式会社 Power supply and charger using the same

Also Published As

Publication number Publication date
JP2014053992A (en) 2014-03-20

Similar Documents

Publication Publication Date Title
US7573731B2 (en) Active-clamp current-source push-pull DC-DC converter
US6556462B1 (en) High power factor converter with a boost circuit having continuous/discontinuous modes
US8233298B2 (en) Power factor correction rectifier that operates efficiently over a range of input voltage conditions
EP1331723A2 (en) Low output voltage, high current, half-bridge, series-resonant, multiphase, DC-DC power supply
CN102474180B (en) DC/DC power converter
JP2012249375A (en) Power supply device
US7619323B2 (en) Uninterruptible power supply capable of providing sinusoidal-wave output AC voltage
JP2012213260A (en) Switching power supply device
US7075193B2 (en) Power factor correcting circuit for uninterrupted power supply
EP2387819B1 (en) Electric power converter
US8107263B2 (en) Series resonant converter
WO2009128373A1 (en) Bidirectional dc/dc converter and power conditioner
JPH05316721A (en) Parallel control type dc/dc converter
JP5590124B2 (en) DC-DC converter
US20060119184A1 (en) Methods and apparatus providing double conversion/series-parallel hybrid operation in uninterruptible power supplies
DE112012005868T5 (en) DC-DC converter
JP2006246598A (en) Dc-dc converter, its controller, power supply, electronic device and control method of dc-dc converter
US9088211B2 (en) Buck-boost converter with buck-boost transition switching control
US20120044728A1 (en) Electric power converter
JP2010004724A (en) Series resonant converter
JP4819902B2 (en) DC / DC power converter
JP2991181B2 (en) Switching power supply
JP3699082B2 (en) Switching power supply circuit
JP6103445B2 (en) Non-contact charging device power supply device
JP4252269B2 (en) Multi-output DC-DC converter

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20150210

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20160122

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20160216

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20160907

R150 Certificate of patent (=grant) or registration of utility model

Ref document number: 6008365

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20160907