A transistor monitoring circuit and a rectifying device

Abstract

The present invention discloses a transistor monitoring circuit, comprising: an energy harvesting module, the input end of the energy harvesting module can be connected to a transistor; a monitoring module, the monitoring module is connected to the output end of the energy harvesting module, the monitoring module can monitor whether the transistor is broken down, the energy harvesting module drives the monitoring module to operate when the transistor is turned off, and the energy harvesting module stops the monitoring module from operating when the transistor is turned on. Since the transistor is likely to break down only when it is turned off, therefore, when the transistor is turned off, the energy harvesting module drives the monitoring module to operate to monitor whether the transistor is broken down, and when the transistor is turned on, the energy harvesting module stops the monitoring module from operating to reduce power consumption, which is beneficial to saving electric energy.

Description

Technical Field

[0001] The present invention relates to the field of transistor detection, and particularly to a transistor monitoring circuit and a rectifying device. Background Art

[0002] For transistors, such as diodes, in the high-voltage and high-power operating environment of rectifying devices, diodes often need to withstand a large reverse voltage to achieve effects such as unidirectional conduction and rectification. Due to reasons such as device aging or excessive voltage, the diode may be broken down and damaged. After the diode is broken down, it will lose its unidirectional conduction characteristic, and the flowing current will increase, which will further affect other components in the circuit and cause problems of secondary damage.

[0003] In the prior art, a breakdown protection circuit is provided in some circuits to detect whether the transistor is broken down, and then, when the transistor is broken down, emergency treatment can be carried out in time to avoid the problem of secondary damage. However, the existing breakdown protection circuits consume a large amount of electric energy during normal operation, which is not conducive to saving electric energy. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a transistor monitoring circuit, which can monitor the transistor when the transistor is cut off and withstands voltage, and stop monitoring the transistor when the transistor is conducting, which is beneficial to saving electric energy.

[0005] The present invention also provides a rectifying device, which can realize the rectifying function and can monitor whether the rectifying diode is broken down, improving the reliability.

[0006] A transistor monitoring circuit according to an embodiment of the first aspect of the present invention includes: an energy acquisition module, an input end of the energy acquisition module can be connected to a transistor; a monitoring module, the monitoring module is connected to an output end of the energy acquisition module, the monitoring module can monitor whether the transistor is broken down, the energy acquisition module drives the monitoring module to operate when the transistor is cut off, and the energy acquisition module stops the monitoring module from operating when the transistor is conducting.

[0007] A transistor monitoring circuit according to an embodiment of the present invention has at least the following beneficial effects: Since the transistor is only likely to be broken down when it is cut off, therefore, when the transistor is cut off, the energy acquisition module drives the monitoring module to operate to monitor whether the transistor is broken down, and the energy acquisition module stops the monitoring module from operating when the transistor is conducting to reduce power consumption, which is beneficial to saving electric energy.

[0008] According to some embodiments of the present invention, the monitoring module includes a switching unit and a control unit connected to the switching unit. The energy harvesting module is respectively connected to the switching unit and the control unit, and the control unit controls the opening and closing of the switching unit according to the voltage borne by the transistor.

[0009] According to some embodiments of the present invention, the monitoring module further includes a photoelectric conversion unit and a status collection unit. The input end of the photoelectric conversion unit is connected to the switching unit, and the output end of the photoelectric conversion unit is connected to the status collection unit through an optical fiber.

[0010] According to some embodiments of the present invention, the energy harvesting module includes a half-wave rectification unit and a voltage stabilization unit. The input end of the half-wave rectification unit can be connected to the transistor, the output end of the half-wave rectification unit is connected to the input end of the voltage stabilization unit, and the output end of the voltage stabilization unit is connected to the monitoring module.

[0011] According to some embodiments of the present invention, the energy harvesting module further includes an overvoltage protection unit, and the voltage stabilization unit is connected to the monitoring module through the overvoltage protection unit.

[0012] According to some embodiments of the present invention, the half-wave rectification unit includes diode D1 and diode D2, the voltage stabilization unit includes resistor R1 and capacitor C1, and the overvoltage protection unit includes zener diode ZD1;

[0013] The anode of diode D1 is connected to the cathode of diode D2. The anode of the diode can be connected to the transistor. The cathode of diode D1 is connected to one end of resistor R1. The other end of resistor R1 is respectively connected to one end of capacitor C1, the cathode of zener diode ZD1, and the monitoring module. The anode of diode D2, the other end of capacitor C1, and the anode of zener diode ZD1 are grounded.

[0014] According to some embodiments of the present invention, the switching unit includes switching transistor Q1 and resistor R3, and the control unit includes zener diode ZD2 and switching transistor Q2;

[0015] One end of switching transistor Q1 is respectively connected to the output end of the energy harvesting module, one end of resistor R3, and the cathode of zener diode ZD2. The control end of switching transistor Q1 is respectively connected to the other end of resistor R3 and one end of switching transistor Q2. The other end of switching transistor Q1 is connected to the photoelectric conversion unit;

[0016] The control end of switching transistor Q2 is respectively connected to the anode of zener diode ZD2 and the other end of switching transistor Q1, and the other end of switching transistor Q2 is grounded.

[0017] According to the second aspect of the present invention, the rectifier device includes at least one of the above-mentioned transistor monitoring circuits, and also includes at least two rectifier diodes, the rectifier diodes are connected to form a rectifier circuit, and the energy extraction module is connected to the rectifier diodes.

[0018] According to the rectifier device of the embodiment of the present invention, at least the following beneficial effects are achieved: the rectifier diodes are connected to form a rectifier circuit so as to rectify the input AC power, and the energy extraction module is connected to the rectifier diode so as to drive the monitoring module to monitor the rectifier diode when it is cut off and subjected to reverse voltage, so as to know whether the rectifier diode is broken down, which is conducive to timely reaction and processing when the rectifier diode is broken down, thereby improving reliability. At the same time, when the rectifier diode is turned on, the energy extraction module stops the operation of the monitoring module, which is conducive to reducing power consumption and achieving the purpose of saving power.

[0019] According to some embodiments of the present invention, at least two of the rectifier diodes are connected in series, and also include a voltage-equalizing resistor connected one-to-one with the rectifier diodes in series, one end of the voltage-equalizing resistor is connected to the transistor, and the other end of the voltage-equalizing resistor is connected to the energy extraction module.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 A circuit diagram of one embodiment of the present invention. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In the description of the present invention, if the first and second are described for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0027] As Figure 1 shown, a transistor monitoring circuit according to an embodiment of the present invention includes: an energy harvesting module 100, the input end of the energy harvesting module 100 can be connected to the transistor; a monitoring module 200, the monitoring module 200 is connected to the output end of the energy harvesting module 100, the energy harvesting module 100 drives the monitoring module 200 to operate when the transistor is cut off, and the energy harvesting module 100 stops the monitoring module 200 from operating when the transistor is conducting.

[0028] Since the transistor may only break down when it is cut off, therefore, when the transistor is cut off, the energy harvesting module 100 drives the monitoring module 200 to operate to monitor whether the transistor is broken down, and when the transistor is conducting, the energy harvesting module 100 stops the monitoring module 200 from operating to reduce power consumption, which is beneficial to saving electric energy.

[0029] Referring to Figure 1 , in some embodiments of the present invention, the monitoring module 200 includes a switch unit 210 and a control unit 220 connected to the switch unit 210, the energy harvesting module 100 is respectively connected to the switch unit 210 and the control unit 220, and the control unit 220 controls the opening and closing of the switch unit 210 according to the voltage borne by the transistor.

[0030] Since the voltage borne by the transistor will decrease after the transistor is broken down due to excessive voltage when it is cut off, therefore, the control unit 220 controls the opening and closing of the switch unit 210 according to the voltage borne by the transistor, and thus can generate a corresponding breakdown signal after the transistor is broken down to facilitate subsequent emergency processing according to the breakdown signal.

[0031] The voltage output by the energy harvesting module 100 is related to the voltage borne by the transistor, and the control unit 220 can know the magnitude of the voltage borne by the transistor according to the voltage output by the energy harvesting module.

[0032] Referring to Figure 1, in some embodiments of the present invention, the monitoring module 200 further includes a photoelectric conversion unit 230 and a status collection unit 240. The input end of the photoelectric conversion unit 230 is connected to the switch unit 210, and the output end of the photoelectric conversion unit 230 is connected to the status collection unit 240 through an optical fiber.

[0033] The photoelectric conversion unit 230 converts the electrical signal generated by the switch unit 210 into an optical signal, and then transmits it to the status collection unit 240 through the optical fiber, so as to achieve electrical isolation, which is beneficial to protecting the status collection unit 240 and improving reliability.

[0034] The photoelectric conversion unit 230 can be a common photoelectric converter or an implementation mode of a photoelectric conversion circuit. The status collection unit 240 can be an implementation mode including a photoelectric receiver and a processing controller such as a single-chip microcomputer or a PLC. The photoelectric receiver converts the optical signal into an electrical signal and then transmits it to the processing controller. After the processing controller receives the signal and learns that the transistor is broken down, it controls other components to stop running or perform emergency processing.

[0035] Refer to Figure 1 , in some embodiments of the present invention, the energy acquisition module 100 includes a half-wave rectification unit 110 and a voltage stabilization unit 120. The input end of the half-wave rectification unit 110 can be connected to the transistor, the output end of the half-wave rectification unit 110 is connected to the input end of the voltage stabilization unit 120, and the output end of the voltage stabilization unit 120 is connected to the monitoring module 200.

[0036] The half-wave rectification unit 110 is connected to the transistor. The half-wave rectification unit 110 outputs voltage to the voltage stabilization unit 120 when the transistor is turned off, and stops outputting voltage when the transistor is turned on, so as to achieve the purpose of reducing power consumption. The structure is simple and easy to implement. The voltage stabilization unit 120 performs voltage stabilization processing on the voltage output by the half-wave rectification unit 110 to make the voltage output to the monitoring module 200 more stable, which is beneficial to improving stability.

[0037] Refer to Figure 1 , in some embodiments of the present invention, the energy acquisition module 100 further includes an overvoltage protection unit 130. The voltage stabilization unit 120 is connected to the monitoring module 200 through the overvoltage protection unit 130.

[0038] Since voltage fluctuations may occur when the transistor is working, by providing the overvoltage protection unit 130, it is possible to prevent excessive voltage from being output to the monitoring module 200, which is beneficial to protecting the monitoring module 200 from damage and improving reliability.

[0039] Refer to Figure 1, in some embodiments of the present invention, the half-wave rectification unit 110 includes a diode D1 and a diode D2, the voltage regulation unit 120 includes a resistor R1 and a capacitor C1, and the overvoltage protection unit 130 includes a zener diode ZD1;

[0040] The anode of the diode D1 is connected to the cathode of the diode D2. The anode of the diode can be connected to a transistor. The cathode of the diode D1 is connected to one end of the resistor R1. The other end of the resistor R1 is respectively connected to one end of the capacitor C1, the cathode of the zener diode ZD1, and the monitoring module 200. The anode of the diode D2, the other end of the capacitor C1, and the anode of the zener diode ZD1 are grounded.

[0041] The diodes D1 and D2 are connected to form a half-wave rectification circuit, and the resistor R1 and the capacitor C1 are connected to form an RC filter voltage regulation circuit. When the transistor is turned off, the diode D1 is turned on and the diode D2 is turned off. The RC filter voltage regulation circuit obtains a voltage through the diode D1, performs voltage regulation processing, and then transmits it to the monitoring module 200. When the transistor is turned on, the diode D1 is turned off and the diode D2 is turned on. The RC filter voltage regulation circuit is short-circuited by the diode D2, and the diode D1 is turned off. The voltage obtained by the RC filter voltage regulation circuit is so small that it can be ignored, and it can be considered that no voltage is transmitted to the monitoring module 200. In this way, the operation of the monitoring module 200 is stopped when the transistor is turned on, and the circuit structure is simple and easy to implement.

[0042] When the output voltage of the RC filter voltage regulation circuit is greater than the voltage threshold of the zener diode ZD1, the zener diode ZD1 is broken down, and the voltage magnitude is maintained at the voltage threshold of the zener diode ZD1, achieving the effect of overvoltage protection and improving reliability.

[0043] Referring to Figure 1 , in some embodiments of the present invention, the switch unit 210 includes a switching transistor Q1 and a resistor R3, and the control unit 220 includes a zener diode ZD2 and a switching transistor Q2;

[0044] One end of the switching transistor Q1 is respectively connected to the output end of the energy extraction module 100, one end of the resistor R3, and the cathode of the zener diode ZD2. The control end of the switching transistor Q1 is respectively connected to the other end of the resistor R3 and one end of the switching transistor Q2. The other end of the switching transistor Q1 is connected to the photoelectric conversion unit 230;

[0045] The control end of the switching transistor Q2 is respectively connected to the anode of the zener diode ZD2 and the other end of the switching transistor Q1. The other end of the switching transistor Q2 is grounded.

[0046] Take the voltage output by the energy extraction module 100, that is, the voltage output by the RC filter voltage regulator circuit, and apply it to the voltage regulator diode ZD2. When the transistor is cutoff and bears the voltage, the voltage borne by the voltage regulator diode ZD2 is greater than its own voltage threshold, the voltage regulator diode ZD2 breaks down and the flowing current increases. The increasing current causes the switching transistor Q2 to conduct, and then makes the switching transistor Q1 conduct as well. The switching transistor Q1 obtains electrical energy from the RC filter voltage regulator circuit to generate a pulse signal; after the transistor is broken down, since the voltage borne by the transistor decreases, the voltage borne by the voltage regulator diode ZD2 will be less than its own voltage threshold, and the voltage regulator diode ZD2 maintains cutoff, making the switching transistor Q2 and the switching transistor Q1 cutoff, and the switching transistor Q1 will not generate a pulse signal. Through this process, it is possible to know whether the transistor is broken down according to whether a pulse signal is output. The circuit structure is simple and easy to implement.

[0047] Since the conduction process of the switching transistor Q2 is related to the current at the control terminal of the switching transistor Q2, by connecting the control terminal of the switching transistor Q2 to the other end of the switching transistor Q1, after the voltage regulator diode ZD2 breaks down and the current gradually increases, the switching transistor Q2 starts to conduct, making the switching transistor Q1 start to conduct as well. A part of the current output by the switching transistor Q1 is shunted to the control terminal of the switching transistor Q2 to accelerate the conduction of the switching transistor Q2 and form positive feedback, which is beneficial to shortening the conduction time of the switching transistor Q2 and improving the reaction speed.

[0048] In the embodiment where there is a photoelectric conversion unit 230, the pulse signal generated by the switching transistor Q1 is transmitted to the photoelectric conversion unit 230, and the photoelectric conversion unit 230 converts the electrical pulse signal into an optical pulse signal. The state collection unit 240 can judge whether the transistor is broken down according to whether an optical pulse signal is received within a preset time.

[0049] Refer to Figure 1 , according to the rectifying device of the second aspect embodiment of the present invention, it includes at least one of the above-mentioned transistor monitoring circuits, and further includes at least two rectifying diodes 300. The rectifying diodes 300 are connected to form a rectifying circuit, and the energy extraction module 100 is connected to the rectifying diodes 300.

[0050] The rectifying diodes 300 are connected to form a rectifying circuit to be able to rectify the input alternating current. The energy extraction module 100 is connected to the rectifying diodes 300 to drive the monitoring module 200 to monitor them when the rectifying diodes 300 are cutoff and bear the reverse voltage, so as to be able to know whether the rectifying diodes 300 are broken down, which is beneficial to being able to react in time when the rectifying diodes 300 are broken down and improving the reliability. At the same time, when the rectifying diodes 300 are conducting, the energy extraction module 100 stops the operation of the monitoring module 200, which is beneficial to reducing power consumption and achieving the purpose of saving electric energy.

[0051] The connection between the rectifying diodes 300 can form a common half-bridge rectifying circuit or a full-bridge rectifying circuit.

[0052] Referring to Figure 1 , in some embodiments of the present invention, at least two rectifying diodes 300 are connected in series, and there is also a voltage-sharing resistor 400 connected in one-to-one correspondence with the series-connected rectifying diodes 300. One end of the voltage-sharing resistor 400 is connected to the transistor, and the other end of the voltage-sharing resistor 400 is connected to the energy harvesting module 100.

[0053] In the field of high-voltage rectification, by connecting multiple rectifying diodes 300 in series, the voltage level of the series circuit can be increased. At the same time, since there is a voltage-sharing resistor 400 connected in one-to-one correspondence with the rectifying diodes 300, the series-connected rectifying diodes 300 can evenly divide the voltage. The energy harvesting module 100 is connected to the rectifying diodes 300 through the voltage-sharing resistor 400. The voltage-sharing resistor 400 can limit the magnitude of the current flowing into the energy harvesting module 100, eliminating the need for an additional current-limiting resistor, that is, achieving the effect of reusing the voltage-sharing resistor 400, which is beneficial to simplifying the circuit structure and saving components.

[0054] In some embodiments of the present invention, a current-limiting resistor can be separately provided, and the energy harvesting module 100 is connected to the rectifying diodes 300 through the current-limiting resistor.

[0055] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0056] Certainly, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A transistor monitoring circuit, characterized in that, Comprising: An energy extraction module (100), the input end of the energy extraction module (100) being capable of being connected to a transistor; A monitoring module (200), the monitoring module (200) being connected to the output end of the energy extraction module (100), the monitoring module (200) being capable of monitoring whether the transistor is broken down, the energy extraction module (100) driving the monitoring module (200) to operate when the transistor is turned off, and the energy extraction module (100) stopping the monitoring module (200) from operating when the transistor is turned on; The monitoring module (200) includes a switching unit (210) and a control unit (220) connected to the switching unit (210), the energy extraction module (100) being respectively connected to the switching unit (210) and the control unit (220), and the control unit (220) controlling the opening and closing of the switching unit (210) according to the voltage borne by the transistor; The monitoring module (200) further includes a photoelectric conversion unit (230) and a status collection unit (240), the input end of the photoelectric conversion unit (230) being connected to the switching unit (210), and the output end of the photoelectric conversion unit (230) being connected to the status collection unit (240) through an optical fiber; The switching unit (210) includes a switching transistor Q1 and a resistor R3, and the control unit (220) includes a voltage stabilizing diode ZD2 and a switching transistor Q2; One end of the switching transistor Q1 is respectively connected to the output end of the energy extraction module (100), one end of the resistor R3, and the cathode of the voltage stabilizing diode ZD2, the control end of the switching transistor Q1 is respectively connected to the other end of the resistor R3 and one end of the switching transistor Q2, and the other end of the switching transistor Q1 is connected to the photoelectric conversion unit (230); The control end of the switching transistor Q2 is respectively connected to the anode of the voltage stabilizing diode ZD2 and the other end of the switching transistor Q1, and the other end of the switching transistor Q2 is grounded.

2. The transistor monitoring circuit according to claim 1, wherein: The energy extraction module (100) includes a half-wave rectification unit (110) and a voltage stabilizing unit (120), the input end of the half-wave rectification unit (110) being capable of being connected to a transistor, the output end of the half-wave rectification unit (110) being connected to the input end of the voltage stabilizing unit (120), and the output end of the voltage stabilizing unit (120) being connected to the monitoring module (200).

3. The transistor monitoring circuit according to claim 2, wherein: The energy extraction module (100) further includes an overvoltage protection unit (130), and the voltage stabilizing unit (120) is connected to the monitoring module (200) through the overvoltage protection unit (130).

4. A transistor monitoring circuit according to claim 3, wherein: The half-wave rectification unit (110) includes a diode D1 and a diode D2, the voltage stabilizing unit (120) includes a resistor R1 and a capacitor C1, and the overvoltage protection unit (130) includes a voltage stabilizing diode ZD1; The anode of the diode D1 is connected to the cathode of the diode D2. The anode of the diode can be connected to a transistor. The cathode of the diode D1 is connected to one end of the resistor R1. The other end of the resistor R1 is respectively connected to one end of the capacitor C1, the cathode of the voltage stabilizing diode ZD1, and the monitoring module (200). The anode of the diode D2, the other end of the capacitor C1, and the anode of the voltage stabilizing diode ZD1 are grounded.

5. Rectifying device, characterized in that, Comprising at least one transistor monitoring circuit as described in any one of claims 1 to 4, and further comprising at least two rectifier diodes (300). A rectifier circuit is formed by connecting the rectifier diodes (300) together. The energy harvesting module (100) is connected to the rectifier diodes (300).

6. The rectifying device according to claim 5, characterized in that: At least two of the rectifier diodes (300) are connected in series. Also included are voltage equalizing resistors (400) connected in one-to-one correspondence with the series-connected rectifier diodes (300). One end of the voltage equalizing resistor (400) is connected to the transistor, and the other end of the voltage equalizing resistor (400) is connected to the energy harvesting module (100).

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