IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0838416
(2010-07-16)
|
등록번호 |
US-8400100
(2013-03-19)
|
우선권정보 |
JP-2009-168835 (2009-07-17) |
발명자
/ 주소 |
- Takizawa, Satoki
- Gekinozu, Masakazu
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
5 |
초록
▼
An electric power converter includes a DC to DC converter section adjusting DC power of a battery with at least two units in series, a DC circuit having at least two DC link capacitors in series between a positive and a negative line from the DC to DC converter section, an electric power converter s
An electric power converter includes a DC to DC converter section adjusting DC power of a battery with at least two units in series, a DC circuit having at least two DC link capacitors in series between a positive and a negative line from the DC to DC converter section, an electric power converter section connected to the DC circuit to convert DC electric power to AC electric power for a motor, a bilateral switching circuit connecting an intermediate potential point between the capacitors and an AC output point in the electric power converter section, and a short-circuit between the intermediate potential point of the DC circuit and an intermediate potential point between the battery units. Normal operation of a load is ensured even when the battery, the capacitor in the DC circuit or the switching device in the electric power converter section becomes abnormal, while achieving high efficiency.
대표청구항
▼
1. An electric power converter comprising: a battery with at least two battery units connected in series;a DC to DC converter section adjusting DC electric power of the battery and having a positive electrode side line and a negative electrode side line;a DC circuit having at least two DC link capac
1. An electric power converter comprising: a battery with at least two battery units connected in series;a DC to DC converter section adjusting DC electric power of the battery and having a positive electrode side line and a negative electrode side line;a DC circuit having at least two DC link capacitors connected in series between the positive electrode side line and the negative electrode side line;an electric power converter section connected to the DC circuit to convert DC electric power to AC electric power and supply the converted AC electric power to a motor;a first bilateral switching device connecting a first intermediate potential point between the DC link capacitors to an AC output point in the electric power converter section; anda short circuit formed with an intermediate potential line short-circuiting the first intermediate potential point to a second intermediate potential point between the battery units. 2. The electric power converter as claimed in claim 1, wherein a second bilateral switching device is inserted between the first and second intermediate potential points. 3. The electric power converter as claimed in claim 2 wherein, when an abnormality is detected in at least one of the battery units in the battery, the second bilateral switching device is made open and DC electric power of a normal battery unit is adjusted in the DC to DC converter section to be supplied to the DC circuit. 4. The electric power converter as claimed in claim 1, wherein the electric power converter section is provided with a plurality of switching arms corresponding to respective phases of polyphase AC electric power and connected in parallel between the positive electrode side line and the negative electrode side line,each switching arm has a pair of switching devices connected in series between the positive electrode side line and the negative electrode side line with a connection point thereof serving as the AC output point,the switching devices are configured to operate to convert DC electric power to polyphase AC electric power to be supplied to the motor, such that the motor is driven in two step speed regions of a low speed regions and a high speed regions, andan operation control mode of the switching devices and the bilateral switching devices differs between a case of driving the motor in a low speed region and a case of driving the motor in a high speed region. 5. The electric power converter as claimed in claim 4 wherein, when driving the motor in the low speed region, the motor is driven in a four switching device operation control mode in which, in the electric power converter section, switching devices in a switching arm corresponding to an arbitrary phase of the polyphase are brought into a normally turned-off states, only the respective first bilateral switching device, connecting the intermediate potential point in the DC circuit and an AC output point in the switching arm having the switching devices being brought into the normally turned-off states, is brought into a normally turned-on state and on-off control is carried out with respect to the switching devices in switching arms other than the switching arm having the switching devices brought into the normally turned-off state and,when driving the motor in the high speed region, the motor is driven in a two-level operation control mode in which all of the first bilateral switching devices connecting the intermediate potential point in the DC circuit and the AC output points in all of the switching arms are brought into normally turned-off states and on-off control is carried out with respect to all of the switching devices in all of the switching arms in the electric power converter section. 6. The electric power converter as claimed in claim 4 wherein, when driving the motor in the low speed region, the motor is driven in a three-level operation control mode in which, in the electric power converter section, on-off control is carried out with respect to the switching devices in the switching arms and the respective first bilateral switching devices connecting the intermediate potential point in the DC circuit and the AC output points in the switching arms and,when driving the motor in the high speed region, the motor is driven in a two-level operation control mode in which all of the first bilateral switching devices connecting the intermediate potential point in the DC circuit and the AC output points in all of the switching arms are brought into normally turned-off states and on-off control is carried out with respect to all of the switching devices in all of the switching arms in the electric power converter section. 7. The electric power converter as claimed in claim 4 wherein, when driving the motor in the low speed region, the motor is driven in a four switching device operation control mode in which, in the electric power converter section, switching devices in a switching arm corresponding to an arbitrary phase of the polyphase are brought into normally turned-off states, only the first bilateral switching device, connecting the intermediate potential point in the DC circuit and an AC output point in the switching arm having the switching devices being brought into the normally turned-off states, is brought into a normally turned-on state and on-off control is carried out with respect to the switching devices in switching arms other than the switching arm having the switching devices brought into the normally turned-off state and,when driving the motor in the high speed region, the motor is driven in a three-level operation control mode in which, in the electric power converter section, on-off control is carried out with respect to the switching devices in the switching arms and the first bilateral switching devices connecting the intermediate potential point in the DC circuit and the AC output points in the switching arms. 8. The electric power converter as claimed in claim 1, wherein the electric power converter section is provided with a plurality of switching arms corresponding to respective phases of polyphase AC electric power and connected in parallel between the positive electrode side line and the negative electrode side line,each switching arm has a pair of switching devices connected in series between the positive electrode side line and the negative electrode side line with the connection point serving as the AC output point,the switching devices are configured to operate to convert DC electric power to polyphase AC electric power to be supplied to the motor, such that the motor is driven in three step speed regions of a low speed region, an intermediate speed region and a high speed region, andan operation control mode of the switching devices and the bilateral switching devices differs among a case of driving the motor in the low speed region, a case of driving the motor in the intermediate speed region and a case of driving the motor in the high speed region. 9. The electric power converter as claimed in claim 8 wherein, when driving the motor in the low speed region, the motor is driven in a four switching device operation control mode in which, in the electric power converter section, switching devices in a switching arm corresponding to an arbitrary phase of the polyphase are brought into normally turned-off states, only the first bilateral switching device, connecting the intermediate potential point in the DC circuit and an AC output point in the switching arm having the switching devices being brought into the normally turned-off states, is brought into a normally turned-on state and on-off control is carried out with respect to the switching devices in switching arms other than the switching arm having the switching devices brought into the normally turned-off state,when driving the motor in the intermediate speed region, the motor is driven in the three-level operation control mode in which, in the electric power converter section, on-off control is carried out with respect to the switching devices in the switching arms and the bilateral switching devices connecting the intermediate potential point in the DC circuit and the AC output points in the switching arms, andwhen driving the motor in the high speed region, the motor is driven in the two-level operation control mode in which all of the bilateral switching devices connecting the intermediate potential point in the DC circuit and the AC output points in all of the switching arms are brought into normally turned-off states and on-off control is carried out with respect to all of the switching devices in all of the switching arms in the electric power converter section. 10. The electric power converter as claimed in claim 1 wherein, when an abnormality is detected in at least one of the switching arms forming the electric power converter, the first bilateral switching device, connected between the intermediate potential point in the DC circuit and the AC output point in the switching arm with the abnormality detected therein, is brought into a normally turned-on state and on-off control is carried out with respect to switching devices in switching arms other than the switching arm with the abnormality detected therein to make the motor driven. 11. The electric power converter as claimed in claim 1 wherein, when an abnormality is detected in one of the capacitors in the DC circuit, a third bilateral switching device, forming a step-up circuit on the side with a polarity opposite to the polarity on the side of the capacitor with the abnormality detected therein, is brought into a normally turned-on state,a fourth bilateral switching device connected to a battery unit on the same polarity side is brought into an opened state, andthe motor is driven in a two-level operation control mode in which all of the first bilateral switching devices connecting the intermediate potential point in the DC circuit and the AC output points in all of the switching arms are brought into normally turned-off states and on-off control is carried out with respect to all of the switching devices in all of the switching arms in the electric power converter section. 12. The electric power converter as claimed claim 1, wherein the DC to DC converter section comprises a positive electrode side switching arm having a pair of switching devices connected in series between the positive electrode side line and the intermediate potential line,a negative electrode side switching arm having a pair of switching devices connected in series between the intermediate potential line and the negative electrode side line,a first step-up reactor inserted between a first connection point between the switching devices in the positive electrode side switching arm and the positive electrode side of the battery, anda second step-up reactor inserted between a second connection point between the switching devices in the negative electrode side switching arm and the negative electrode side of the battery. 13. The electric power converter as claimed in claim 1, wherein the DC to DC converter section comprises a positive electrode side switching arm having a pair of switching devices connected in series between the positive electrode side line and the intermediate potential line,a negative electrode side switching arm having a pair of switching devices connected in series between the intermediate potential line and the negative electrode side line, anda step-up reactor inserted in the short circuit, a first connection point between the switching devices in the positive electrode side switching arm being connected to the positive electrode side of the battery, and a second connection point between the switching devices in the negative electrode side switching arm being connected to the negative electrode side of the battery. 14. An electric power converter comprising: a DC power supply section outputting DC electric power by electric power generation;a battery with at least two battery units connected in series;a DC to DC converter section adjusting DC electric power of the battery and having a positive electrode side line and a negative electrode side line;a DC circuit having at least two DC link capacitors connected in series between the positive electrode side line and the negative electrode side line;an electric power converter section connected to the DC circuit to convert DC electric power to AC electric power and supply the converted AC electric power to a motor;a first bilateral switching device connecting a first intermediate potential point between the DC link capacitors to an AC output point in the electric power converter section; anda short circuit formed with an intermediate potential line short-circuiting the first intermediate potential point to a second intermediate potential point between the battery units. 15. The electric power converter as claimed in claim 14 wherein the DC power supply section comprises an AC generator driven by an internal combustion engine and an AC to DC electric power converter section converting AC electric power generated by the AC generator to DC electric power. 16. The electric power converter as claimed in claim 14 wherein the DC power supply section is formed with a DC generator unit formed with at least one of a fuel cell and a solar cell. 17. The electric power converter as claimed in claim 14, wherein an additional bilateral switching device is inserted between the first and second intermediate potential points.
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