阅读说明：本技术 检测器以及电力转换装置 (Detector and power conversion device ) 是由 方田勋 李钾 船户裕树 栗原龙二 于 2018-06-01 设计创作，主要内容包括：本发明具备：1个以上的检测用二极管，其对检测对象的环境的变化进行检测；Y电容器，其具有分别分开配置于检测用二极管的一端与GND之间以及检测用二极管的另一端与GND之间的多个电容器；以及整流电路，其至少配置于检测用二极管的一端与GND之间或者检测用二极管的另一端与GND之间并与Y电容器串联连接，将与被检测用二极管感应出的噪声相伴的共模电流传递到GND，并且切断在多个电容器与检测用二极管之间流动的正常模式环路电流。(The present invention is provided with: 1 or more detection diodes for detecting a change in an environment of a detection target; a Y capacitor having a plurality of capacitors separately disposed between one end of the detection diode and GND and between the other end of the detection diode and GND, respectively; and a rectifying circuit which is disposed at least between one end of the detection diode and GND or between the other end of the detection diode and GND, is connected in series with the Y capacitor, transmits a common mode current accompanied by noise induced in the detection diode to GND, and cuts off a normal mode loop current flowing between the plurality of capacitors and the detection diode.)

1. A detector is characterized by comprising:

1 or more detection diodes for detecting a change in an environment of a detection target;

a Y capacitor having a plurality of capacitors separately disposed between one end of the detection diode and GND and between the other end of the detection diode and GND, respectively; and

and a rectifier circuit that is disposed at least between one end of the detection diode and the GND or between the other end of the detection diode and the GND, is connected in series with the Y capacitor, transmits a common mode current associated with noise induced by the detection diode to the GND, and cuts off a normal mode loop current flowing between the plurality of capacitors and the detection diode.

2. The detector of claim 1,

the rectifying circuit includes a plurality of rectifying diodes, each of cathode terminals of the plurality of rectifying diodes is connected to the GND, one anode terminal of one of the plurality of rectifying diodes is connected to one end of the detecting diode via one of the plurality of capacitors, and the other anode terminal of the plurality of rectifying diodes is connected to the other end of the detecting diode via another one of the plurality of capacitors.

3. The detector of claim 1,

the rectifying circuit includes a plurality of rectifying diodes, each of anode terminals of the plurality of rectifying diodes is connected to the GND, one of cathode terminals of the plurality of rectifying diodes is connected to one end of the detecting diode via one of the plurality of capacitors, and the other of cathode terminals of the plurality of rectifying diodes is connected to the other end of the detecting diode via another one of the plurality of capacitors.

4. The detector of claim 1,

the rectifying circuit includes a plurality of rectifying diodes, one anode terminal of the plurality of rectifying diodes is connected to one end of the detection diode, one cathode terminal of the plurality of rectifying diodes is connected to GND via one of the plurality of capacitors, the other anode terminal of the plurality of rectifying diodes is connected to the other end of the detection diode, and the other cathode terminal of the plurality of rectifying diodes is connected to GND via the other of the plurality of capacitors.

5. The detector of claim 1,

the rectifying circuit includes a plurality of rectifying diodes, one cathode terminal of the plurality of rectifying diodes is connected to one end of the detection diode, one anode terminal of the plurality of rectifying diodes is connected to the GND via one of the plurality of capacitors, the other cathode terminal of the plurality of rectifying diodes is connected to the other end of the detection diode, and the other anode terminal of the plurality of rectifying diodes is connected to the GND via the other of the plurality of capacitors.

6. The detector according to any one of claims 1 to 5,

a filter circuit for removing the normal mode noise induced by the detection diode is connected to both ends of the detection diode.

7. The detector according to any one of claims 1 to 6,

as the reference voltage, the GND is set to a zero voltage value or a negative voltage value.

8. The detector according to any one of claims 1 to 7,

the detection diode, the Y capacitor, and the rectifier circuit are disposed in a module of the detection object housing the detection diode.

9. A power conversion device is characterized by comprising:

a power converter that converts direct-current power into alternating-current power or converts the alternating-current power into the direct-current power by switching operations of a plurality of semiconductor elements;

a detector that outputs a voltage corresponding to an ambient temperature of a detection target to be detected, the detection target being the plurality of semiconductor elements; and

a controller for controlling the switching operation of the plurality of semiconductor elements, comparing the output voltage of the detector with a set value, and stopping the switching operation of the plurality of semiconductor elements on the condition that the output voltage of the detector exceeds the set value,

the detector comprises more than 1 detection diode, Y capacitor and rectifier circuit,

the detection diode detects a change in ambient temperature of the plurality of semiconductor elements,

the Y capacitor has a plurality of capacitors separately disposed between one end of the detection diode and GND and between the other end of the detection diode and GND,

the rectifier circuit is disposed at least between one end of the detection diode and the GND or between the other end of the detection diode and the GND, is connected in series with the Y capacitor, transmits a common mode current associated with noise induced by the detection diode to the GND, and cuts off a normal mode loop current flowing between the plurality of capacitors and the detection diode.

10. The power conversion apparatus according to claim 9,

the rectifying circuit includes a plurality of rectifying diodes, each of cathode terminals of the plurality of rectifying diodes is connected to the GND, one anode terminal of one of the plurality of rectifying diodes is connected to one end of the detecting diode via one of the plurality of capacitors, and the other anode terminal of the plurality of rectifying diodes is connected to the other end of the detecting diode via another one of the plurality of capacitors.

11. The power conversion apparatus according to claim 9,

the rectifying circuit includes a plurality of rectifying diodes, each of anode terminals of the plurality of rectifying diodes is connected to the GND, one of cathode terminals of the plurality of rectifying diodes is connected to one end of the detecting diode via one of the plurality of capacitors, and the other of cathode terminals of the plurality of rectifying diodes is connected to the other end of the detecting diode via another of the plurality of capacitors.

12. The power conversion apparatus according to claim 9,

the rectifying circuit includes a plurality of rectifying diodes, one anode terminal of the plurality of rectifying diodes is connected to one end of the detection diode, one cathode terminal of the plurality of rectifying diodes is connected to GND via one of the plurality of capacitors, the other anode terminal of the plurality of rectifying diodes is connected to the other end of the detection diode, and the other cathode terminal of the plurality of rectifying diodes is connected to GND via the other of the plurality of capacitors.

13. The power conversion apparatus according to claim 9,

the rectifying circuit includes a plurality of rectifying diodes, one cathode terminal of the plurality of rectifying diodes is connected to one end of the detection diode, one anode terminal of the plurality of rectifying diodes is connected to the GND via one of the plurality of capacitors, the other cathode terminal of the plurality of rectifying diodes is connected to the other end of the detection diode, and the other anode terminal of the plurality of rectifying diodes is connected to the GND via the other of the plurality of capacitors.

14. The power conversion apparatus according to any one of claims 9 to 13,

a filter circuit for removing the normal mode noise induced by the detection diode is connected to both ends of the detection diode.

15. The power conversion device according to any one of claims 9 to 14,

as the reference voltage, the GND is set to a zero voltage value or a negative voltage value.

Technical Field

The present invention relates to a detector and a power conversion apparatus using the same.

Background

As a background art in this field, japanese patent application laid-open No. 2010-249687 (patent document 1) is known. This publication describes that "in order to provide a physical quantity detection device capable of suppressing voltage variation of a detection element due to common mode noise and accurately detecting a physical quantity, the temperature detection device 1 includes temperature sensing diodes 10 to 12, a capacitor 13, resistors 14 and 15, a reference power supply 16, and a comparator 18. One end of each of the temperature sensing diodes 10 to 12 is connected to a circuit GND insulated from the vehicle body via a resistor 14, and the other end is connected to a comparator 18 via a resistor 15. The capacitor 13 is connected in parallel to the temperature sensing diodes 10 to 12. One end of the reference power supply 16 is connected to the circuit GND, and the other end is connected to the comparator 18. The capacitor 13 and the resistors 14 and 15 can suppress common mode noise. Therefore, the voltage variation of the temperature sensing diodes 10 to 12 due to the common mode noise can be suppressed, and the temperature can be accurately detected. ".

Disclosure of Invention

Accordingly, the present invention provides a detector capable of cutting off a normal mode loop current while removing common mode noise superimposed on noise caused by electromagnetic interference, and a power conversion device using the detector.

In order to solve the above problem, the present invention is characterized by comprising: 1 or more detection diodes for detecting a change in an environment of a detection target; a Y capacitor having a plurality of capacitors separately disposed between one end of the detection diode and GND and between the other end of the detection diode and GND, respectively; and a rectifier circuit that is disposed at least between one end of the detection diode and the GND or between the other end of the detection diode and the GND, is connected in series to the Y capacitor, transmits a common mode current associated with noise induced by the detection diode to the GND, and cuts off a normal mode loop current flowing between the plurality of capacitors and the detection diode.

Effects of the invention

According to the present invention, it is possible to remove common mode noise superimposed on noise caused by electromagnetic interference and cut off normal mode loop current.

Problems, structures, and effects other than those described above will be clarified by the following description of the embodiments.

Drawings

Fig. 1 is a block diagram showing the structure of a detector in embodiment 1.

Fig. 2 is a block diagram showing a configuration of a power conversion device according to embodiment 1.

Fig. 3 is a block diagram showing an outline of the BCI experiment.

Fig. 4 is a block diagram showing the structure of the detector in embodiment 2.

Fig. 5 is a block diagram showing the structure of the detector in embodiment 3.

Fig. 6 is a block diagram showing the structure of the detector in embodiment 4.

Fig. 7 is a block diagram showing the structure of a detector in embodiment 5.

Fig. 8 is a block diagram showing the configuration of the main part of the detector in embodiment 6.

Detailed Description

Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same reference numerals denote the same or equivalent parts. In addition, the present invention is not limited to the illustrated examples.