阅读说明：本技术 电力电子设备和用于向功率半导体开关的驱动电路供应电压的方法 (Power electronic device and method for supplying voltage to a drive circuit of a power semiconductor switch ) 是由 B·穆勒 于 2020-02-03 设计创作，主要内容包括：本发明涉及一种电力电子设备(1a),具有第一功率半导体开关(6a)和驱动电路(49、49a、49b)。利用该电力电子设备能够向适用于至少一种操作模式的驱动电路供应电压。为此,包括辅助电路装置(52、52a、52b),该辅助电路装置具有供电电容器(53、53a、53b)和辅助电容器(54)、常关辅助半导体开关(55,55a、55b)、二极管(56)和自举二极管(57),其中辅助半导体开关(55、55a、55b)经由第一连接点(58)连接在第一功率半导体开关(6a)的参考电位端子(59)上,从该第一连接点(58)开始,二极管(56)、第二连接点(60)和辅助电容器(54)的串联电路与辅助半导体开关(55、55a、55b)并联布置,使得在辅助半导体开关(55、55a、55b)截止时,辅助电容器(54)通过流经第一功率半导体开关(6a)的电流充电,并且供电电容器(53、53a、53b)一方面经由自举二极管(57)与第二连接点(60)电连接,另一方面与参考电位端子(59)电连接,使得在辅助半导体开关(55、55a、55b)导通且辅助电容器(54)充电时,供电电容器(53、53a、53b)经由自举二极管(57)被辅助电容器(54)充电。(The invention relates to a power electronic device (1a) having a first power semiconductor switch (6a) and a driver circuit (49, 49a, 49 b). With which the electronic device is able to supply a voltage to a drive circuit adapted to at least one mode of operation. To this end, an auxiliary circuit arrangement (52, 52a, 52b) is included, which has a supply capacitor (53, 53a, 53b) and an auxiliary capacitor (54), a normally-off auxiliary semiconductor switch (55, 55a, 55b), a diode (56) and a bootstrap diode (57), wherein the auxiliary semiconductor switch (55, 55a, 55b) is connected via a first connection point (58) to a reference potential terminal (59) of the first power semiconductor switch (6a), starting from which first connection point (58) a series circuit of the diode (56), a second connection point (60) and the auxiliary capacitor (54) is arranged in parallel with the auxiliary semiconductor switch (55, 55a, 55b) in such a way that the auxiliary capacitor (54) is charged by a current flowing through the first power semiconductor switch (6a) when the auxiliary semiconductor switch (55, 55a, 55b) is switched off, the power supply capacitors (53, 53a, 53b) are electrically connected to the second connection point (60) via a bootstrap diode (57) and to a reference potential terminal (59), so that when the auxiliary semiconductor switches (55, 55a, 55b) are turned on and the auxiliary capacitor (54) is charged, the power supply capacitors (53, 53a, 53b) are charged by the auxiliary capacitor (54) via the bootstrap diode (57).)

1. A power electronic device (1a), in particular a current transformer (1b), with a first power semiconductor switch (6a), a drive circuit (49, 49a, 49b) for driving the first power semiconductor switch (6a) and an electrical auxiliary circuit arrangement (52, 52a, 52b) for supplying a voltage to the drive circuit (49, 49a, 49b), wherein the auxiliary circuit arrangement (52, 52a, 52b) comprises a supply capacitor (53, 53a, 53b) and an auxiliary capacitor (54), a normally-off auxiliary semiconductor switch (55, 55a, 55b), a diode (56) and a bootstrap diode (57), wherein

The auxiliary semiconductor switch (55, 55a, 55b) is connected to a reference potential terminal (59) of the first power semiconductor switch (6a) via a first connection point (58),

starting from the first connection point (58), a series circuit of the diode (56), a second connection point (60) and the auxiliary capacitor (54) is arranged in parallel with the auxiliary semiconductor switch (55, 55a, 55b) such that the auxiliary capacitor (54) is charged by a current flowing through the first power semiconductor switch (6a) when the auxiliary semiconductor switch (55, 55a, 55b) is switched off,

the drive circuit (49, 49a, 49b) is connected to the supply capacitor (53, 53a, 53b) in order to supply the drive circuit with a voltage, an

The supply capacitor (53, 53a, 53b) is electrically connected with a first terminal (61) via the bootstrap diode (57) to the second connection point (60) and with a second terminal (62) to the reference potential terminal (59) such that the supply capacitor (53, 53a, 53b) is charged via the bootstrap diode (57) by the auxiliary capacitor (54) when the auxiliary semiconductor switch (55, 55a, 55b) is conducting and the auxiliary capacitor (54) is at least partially charged.

2. Power electronic device (1a) according to claim 1, wherein the auxiliary circuit arrangement (52, 52a, 52b) comprises a drive circuit (64) designed and configured to provide a control signal for switching the auxiliary semiconductor switch (55, 55a, 55b) at a control input of the auxiliary semiconductor switch (55, 55a, 55b) in dependence on a charging voltage of the auxiliary capacitor (54).

3. Power electronic device (1a) according to claim 2, wherein the drive circuit (64) is designed and configured to provide a control signal at the control input of the auxiliary semiconductor switch (55, 55a, 55b) to switch the auxiliary semiconductor switch (55, 55a, 55b) on when the charging voltage of the auxiliary capacitor (54) exceeds a first threshold value, and to provide a control signal at the control input of the auxiliary semiconductor switch (55, 55a, 55b) to switch the auxiliary semiconductor switch (55, 55a, 55b) off when the charging voltage of the auxiliary capacitor (54) is below a second threshold value, which is smaller than the first threshold value, wherein the first threshold value corresponds at least to the magnitude of the supply voltage of the drive circuit (49, 49a, 49 b).

4. Power electronic device (1a) according to any of claims 2 or 3, wherein the drive circuit (64) is a two-point regulator, in particular a comparator circuit (65), or a monostable flip-flop or a PWM regulating means or a frequency regulating means.

5. Power electronic device (1a) according to any of claims 2-4, wherein the drive circuit (64) is designed and configured in such a way and electrically connected with the auxiliary capacitor (54) that the drive circuit (64) is supplied with voltage by means of the auxiliary capacitor (54).

6. Power electronic device (1a) according to any of the preceding claims, wherein the auxiliary semiconductor switch (55, 55a, 55b) has the same polarity as the first power semiconductor switch (6 a).

7. A power electronic device (1a) according to any of the preceding claims, wherein the first power semiconductor switch (6a) is designed to be normally off and in the off-switched state has a leakage current when a voltage is applied between the reference potential terminal (59) and the further main terminal (70) of the first power semiconductor switch (6 a).

8. Power electronic device (1a) according to any of the preceding claims, wherein the auxiliary circuit arrangement (52, 52a, 52b), in particular the auxiliary semiconductor switch (55, 55a, 55b), is dedicated for powering at least one drive circuit (49, 49a, 49b, 73).

9. Power electronic device (1a) according to any of the preceding claims, wherein the driver circuit (49, 49a, 49b) is designed to be integrated with a clock generator (50), wherein the clock generator (50) is designed for generating a pulse pattern of control signals provided by the driver circuit (49, 49a, 49 b).

10. Power electronic device (1a) according to any of the preceding claims, comprising a half bridge (20a, 20b) comprising, starting from a third connection point (21), a series circuit of a high-side power semiconductor switch (23a), a branch point (39) and a low-side power semiconductor switch (24a) and a fourth connection point (22), wherein the first power semiconductor switch (6a) is the low-side power semiconductor switch (24a), wherein in particular the power electronic device (1a) is a DC/DC converter or inverter (29).

11. A power electronic device (1a) according to claim 10, wherein an intermediate circuit (28) is included, having an electrical connection connecting the third connection point (21) with the fourth connection point (22) via one or more intermediate circuit capacitors connected in series or in parallel.

12. Power electronic device (1a) according to any of claims 10 or 11, wherein for the high-side power semiconductor switch (23a) and the low-side power semiconductor switch (24a) a drive circuit (49a, 49b) for driving the respective power semiconductor switch is comprised, respectively, and an own electrical auxiliary circuit arrangement (52a, 52b) for supplying voltage to the drive circuit (49a, 49b) is comprised, respectively, whereby the high-side power semiconductor switch (23a) and the low-side power semiconductor switch (24a) are both designed as first power semiconductor switches (6 a).

13. A power electronic device (1a) according to any of claims 10 or 11, wherein a drive circuit (73) is included to drive the high side power semiconductor switch (23a) and a supply capacitor (74) to supply voltage to the drive circuit (73), the supply capacitor being electrically connected with one terminal (75) to a reference potential terminal (59) of the high side power semiconductor switch (23a) and with the other terminal (76) via a further bootstrap diode (77) to a first terminal (61) of a supply capacitor (53) included in the auxiliary circuit arrangement (52) for supplying voltage to the drive circuit (49) driving the low side power semiconductor switch (24 a).

14. A power electronic device (1a) according to any of claims 10-13, wherein the high-side power semiconductor switch (23a) and the low-side power semiconductor switch (24a) are normally off and in the off-switched state have a leakage current when a voltage is applied between their reference potential terminal (59) and their other main terminal (70).

15. Method for supplying a voltage to a driver circuit (49) of a power semiconductor switch, wherein a supply capacitor (53, 53a, 53b) supplies the driver circuit (49, 49a, 49b) with the voltage, wherein for charging the supply capacitor (53, 53a, 53b), an auxiliary capacitor (54) is charged by means of a current flowing through the power semiconductor switch during an off switching state of a normally-off auxiliary switch, and the auxiliary capacitor (54) charges the supply capacitor (53) when the normally-off auxiliary switch is switched on.

16. Method according to claim 15, wherein the normally-off auxiliary switch is connected to a reference potential terminal (59) of the power semiconductor such that, in a first method step (VS1), at the time of turning-off of the auxiliary switch, at least a part of the current flowing through the power semiconductor switch is diverted onto the auxiliary capacitor and at least partially charged, wherein, in a second method step (VS2), the auxiliary switch is turned on and at least a part of the charge of the auxiliary capacitor is discharged to the supply capacitor, and, in a third method step (VS3), the auxiliary switch is again brought into the switched state of turning-off, so that electrical power is supplied to the supply capacitor by repeating three method steps a number of times in order to supply the drive circuit in operation.

17. The method of any of claims 15 or 16, wherein the auxiliary switch is turned on based on a charging voltage of the auxiliary capacitor (54).

18. The method of claim 17, wherein the auxiliary switch is turned on when the charging voltage of the auxiliary capacitor (54) exceeds a first threshold (VS2) and turned off when the charging voltage of the auxiliary capacitor (54) is below a second threshold, wherein the second threshold is less than the first threshold (VS 3).

19. The method according to any of claims 15-18, wherein the method is performed using a power electronic device (1a) according to any of claims 1-14.