CN115000914A - Self-checking circuit of flexible direct current converter valve energy taking power supply - Google Patents
Self-checking circuit of flexible direct current converter valve energy taking power supply Download PDFInfo
- Publication number
- CN115000914A CN115000914A CN202210681521.2A CN202210681521A CN115000914A CN 115000914 A CN115000914 A CN 115000914A CN 202210681521 A CN202210681521 A CN 202210681521A CN 115000914 A CN115000914 A CN 115000914A
- Authority
- CN
- China
- Prior art keywords
- power supply
- circuit
- voltage
- resistor
- self
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/243—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for DC systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a self-checking circuit of a flexible direct current converter valve energy taking power supply, wherein an overvoltage self-checking circuit acquires the power supply voltage of the energy taking power supply, compares the power supply voltage of the energy taking power supply with a reference voltage, and outputs an overvoltage signal when the power supply voltage of the energy taking power supply is greater than the reference voltage; the undervoltage self-checking circuit collects the power supply voltage of the energy taking power supply, compares the power supply voltage of the energy taking power supply with the reference voltage, and outputs an undervoltage signal when the power supply voltage of the energy taking power supply is smaller than the reference voltage; the control circuit outputs a turn-off signal to the energy taking power supply based on the overvoltage signal, and the turn-off signal is used for controlling the energy taking power supply to stop working; the information return circuit sends the undervoltage signal or the overvoltage signal to a control system of the flexible direct current converter, so that the functions of self-detection of the energy-taking power supply state and timely reporting of the abnormal state are realized, timely and accurate judgment is provided for protection of the converter valve controller, and the occurrence of fault shutdown events with unknown reasons is reduced.
Description
Technical Field
The invention relates to the technical field of flexible direct current power transmission, in particular to a self-checking circuit of a flexible direct current converter valve energy taking power supply.
Background
The energy taking power supply is an important energy conversion component of the power module of the flexible direct-current transmission converter valve, and has the function of carrying out internal voltage conversion after energy is taken through the direct-current support capacitor of the power module so as to provide working energy for the control board card and the bypass switch of the power module. The working stability and reliability of the energy-taking power supply seriously affect the operation condition of the converter valve power module and also become one of the key factors restricting the operation reliability of the whole system of the converter valve. At present, a DC-DC type energy-taking power supply is adopted by a flexible direct current transmission converter valve, the energy-taking power supply inputs high-voltage direct current, and outputs medium-voltage direct current and low-voltage direct current, so that the function of stable output of wide-range direct current input and medium-voltage and low-voltage direct current is realized, but the self-detection and fault reporting effectiveness of the power supply is low, and the energy-taking power supply is shut down due to multiple unknown reasons in application.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of low self-detection and failure reporting effectiveness of the energy-taking power supply in the prior art, so that the self-detection circuit of the energy-taking power supply of the flexible direct current converter valve is provided.
In order to achieve the purpose, the invention provides the following technical scheme:
the embodiment of the invention provides a self-checking circuit of a flexible direct current converter valve energy-taking power supply, which comprises: the power supply comprises a reference circuit, an overvoltage self-checking circuit, an undervoltage self-checking circuit, a control circuit and an information return circuit, wherein the first end of the reference circuit is connected with the output end of an energy-taking power supply and is used for converting the power supply voltage of the energy-taking power supply into reference voltage; the overvoltage self-checking circuit is connected with the first end of the energy taking power supply, the second end of the overvoltage self-checking circuit is connected with the second end of the reference circuit, the third end of the overvoltage self-checking circuit is connected with an external power supply, the overvoltage self-checking circuit is used for collecting the power supply voltage of the energy taking power supply, comparing the power supply voltage of the energy taking power supply with the reference voltage, and outputting an overvoltage signal when the power supply voltage of the energy taking power supply is greater than the reference voltage; the undervoltage self-checking circuit is connected with the output end of the energy taking power supply at a first end, connected with the second end of the reference circuit at a second end and connected with an external power supply at a third end, and used for acquiring the power supply voltage of the energy taking power supply, comparing the power supply voltage of the energy taking power supply with the reference voltage, and outputting an undervoltage signal when the power supply voltage of the energy taking power supply is smaller than the reference voltage; the first end of the control circuit is connected with the fourth end of the overvoltage self-detection circuit, the second end of the control circuit is connected with the control end of the energy taking power supply, the control circuit is used for outputting a turn-off signal to the energy taking power supply based on the overvoltage signal, and the turn-off signal is used for controlling the energy taking power supply to stop working; and the first end of the information return circuit is connected with the fifth end of the overvoltage self-detection circuit, the second end of the information return circuit is connected with the fourth end of the undervoltage self-detection circuit, the fourth end of the information return circuit is connected with the control system of the flexible direct current converter, and the information return circuit is used for sending the undervoltage signal or the overvoltage signal to the control system of the flexible direct current converter.
In one embodiment, a reference circuit includes: the power supply comprises a first diode, a first resistor, a second resistor, a third resistor, a first capacitor and a first voltage-regulator tube, wherein the anode of the first diode is connected with the output end of the energy-taking power supply, and the cathode of the first diode is respectively connected with the first end of the first resistor and the first end of the second resistor; a first end of the third resistor is respectively connected with a second end of the first resistor, a second end of the second resistor and a first end of the first capacitor, and a second end of the third resistor is connected with a first end of the first voltage-regulator tube; a first capacitor, the second end of which is grounded; and a first end and a second end of the first voltage stabilizing tube are connected with a second end of the overvoltage self-detection circuit and a first end of the undervoltage self-detection circuit, and a third end of the first voltage stabilizing tube is grounded.
In one embodiment, the over-voltage self-test circuit includes: the overvoltage acquisition circuit is connected with the output end of the energy taking power supply at a first end, and connected with the first end of the overvoltage comparison circuit at a second end, and used for acquiring the power supply voltage of the energy taking power supply; and the second end of the overvoltage comparison circuit is connected with the second end of the reference circuit, the third end of the overvoltage comparison circuit is connected with an external power supply, the fourth end of the overvoltage comparison circuit is connected with the first end of the control circuit, the fifth end of the overvoltage comparison circuit is connected with the first end of the information return circuit, the overvoltage comparison circuit is used for comparing the power supply voltage of the energy taking power supply with the reference voltage, and when the power supply voltage of the energy taking power supply is greater than the reference voltage, an overvoltage signal is output.
In one embodiment, an over-voltage comparison circuit includes: the overvoltage detection circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second diode, a third diode, a fourth diode and a first comparator, wherein the forward input end of the first comparator is connected with the second end of the overvoltage acquisition circuit through the fifth resistor, the reverse input end of the first comparator is connected with the second end of the reference circuit through the fourth resistor, the output end of the first comparator is connected with an external power supply through the sixth resistor, and the output end of the first comparator is connected with the anode of the second diode, the anode of the third diode and the anode of the fourth diode; the cathode of the second diode is connected with the first end of the information reporting circuit; a third diode, the cathode of which is connected with the first end of the control circuit; and the cathode of the fourth diode is connected with the positive input end of the first comparator through a seventh resistor.
In one embodiment, the brown-out self-test circuit comprises: the undervoltage acquisition circuit is connected with the output end of the energy taking power supply at a first end, and connected with the first end of the undervoltage comparison circuit at a second end, and used for acquiring the power supply voltage of the energy taking power supply; and the second end of the under-voltage comparison circuit is connected with the second end of the reference circuit, the third end of the under-voltage comparison circuit is connected with an external power supply, the fourth end of the under-voltage comparison circuit is connected with the second end of the information reporting circuit, the under-voltage comparison circuit is used for comparing the power supply voltage of the energy taking power supply with the reference voltage, and when the power supply voltage of the energy taking power supply is smaller than the reference voltage, an under-voltage signal is output.
In one embodiment, the under-voltage comparison circuit includes: the positive input end of the second comparator is connected with the second end of the reference circuit through the eighth resistor, the negative input end of the second comparator is connected with the second end of the undervoltage acquisition circuit through the ninth resistor, the output end of the second comparator is connected with the positive input end of the undervoltage acquisition circuit through the tenth resistor, the output end of the second comparator is further connected with an external power supply through the eleventh resistor, and the output end of the second comparator is further connected with the anode of the fifth diode; and the cathode of the fifth diode is connected with the second end of the information reporting circuit.
In one embodiment, the control circuit includes: the control end of the first switch tube is connected with the fourth end of the overvoltage self-checking circuit through the twelfth resistor, the first end of the first switch tube is connected with an external power supply through the thirteenth resistor, and the second end of the first switch tube is connected with the first end of the optical coupling isolation chip; the second end of the optical coupling isolation chip is grounded, the third end of the optical coupling isolation chip is connected with an external power supply through a fourteenth resistor, and the fourth end of the optical coupling isolation chip is grounded; the control end of the second switch tube is connected with the third end of the optical coupling isolation chip, the control end of the second switch tube is also connected with the first end of the second capacitor and the first end of the fifteenth resistor respectively, the first end of the second switch tube is connected with the control end of the energy taking power supply, and the second end of the second switch tube is grounded; a second capacitor, a second end of which is grounded; and a fifteenth resistor having a second terminal connected to ground.
In one embodiment, the information reporting circuit comprises: the optical signal transmitting circuit comprises an OR gate logic circuit, an isolating circuit and an optical signal transmitting circuit, wherein the first end of the OR gate logic circuit is connected with the fifth end of the overvoltage self-checking circuit, the second end of the OR gate logic circuit is connected with the fourth end of the undervoltage self-checking circuit, and the OR gate logic circuit is used for carrying out OR logic operation on undervoltage signals and overvoltage signals; and the first end of the optical signal transmitting circuit is connected with the second end of the OR gate logic circuit through the isolating circuit, the second end of the optical signal transmitting circuit is connected with the control system of the flexible direct current converter, and the optical signal transmitting circuit is used for transmitting the undervoltage signal or the overvoltage signal to the control system of the flexible direct current converter.
In an embodiment, the self-test circuit for the power source of the flexible dc converter valve further comprises: the self-checking circuit is started, a first end of the self-checking circuit is connected with an external power supply, a second end of the self-checking circuit inputs the input voltage of the energy taking power supply, a third end of the self-checking circuit is connected with a control end of the energy taking power supply, and the self-checking circuit is used for collecting the input voltage of the energy taking power supply and dividing the input voltage of the energy taking power supply to obtain a divided voltage; converting the voltage of an external power supply into a starting reference voltage; and comparing the divided voltage with the starting reference voltage, and outputting a shutdown signal when the divided voltage is smaller than the starting reference voltage, wherein the shutdown signal is used for controlling the energy taking power supply to be shut down.
In one embodiment, the power-on self-test circuit comprises: the voltage acquisition circuit is connected with an external power supply at a first end, inputs the input voltage of the energy taking power supply at a second end, is connected with a first end of the voltage comparison circuit at a third end, and is used for acquiring the input voltage of the energy taking power supply and dividing the input voltage of the energy taking power supply to obtain divided voltage; the second end and the third end of the voltage comparison circuit are both connected with an external power supply, and the fourth end of the voltage comparison circuit is connected with the first end of the starting control circuit and is used for converting the voltage of the external power supply into a starting reference voltage; comparing the divided voltage with a starting reference voltage, and outputting a conducting signal when the divided voltage is smaller than the starting reference voltage; and the second end of the starting control circuit is connected with the control end of the energy taking power supply, the starting control circuit is used for being in a conducting state based on the conducting signal and outputting a stopping signal, and the stopping signal is used for controlling the energy taking power supply to stop.
In one embodiment, the voltage acquisition circuit includes: the first end of the seventeenth resistor is respectively connected with the anode of the sixth diode, the cathode of the seventh diode, the first end of the sixteenth resistor and the first end of the third capacitor, and the second end of the seventeenth resistor is connected with the first end of the eighteenth resistor; the cathode of the sixth diode is connected with an external power supply; a seventh diode having an anode grounded; a sixteenth resistor, a second end of which is connected with an external power supply; an eighteenth resistor, a second end of which is grounded; and the first end of the third capacitor is also connected with the first end of the voltage comparison circuit, and the second end of the third capacitor is grounded.
In one embodiment, the voltage comparison circuit includes: a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, an eighth diode, a ninth diode, a second voltage-regulator tube and a third comparator, wherein the forward input end of the third comparator is connected with the first end of the second voltage-regulator tube and the second end of the second voltage-regulator tube through the nineteenth resistor, the reverse input end of the third comparator is connected with the third end of the voltage acquisition circuit through the twenty-first resistor, the output end of the third comparator is connected with the cathode of the eighth diode through a twenty-twelfth resistor, the output end of the third comparator is further connected with an external power supply through a twenty-thirteen resistor, and the output end of the third comparator is further connected with the anode of the ninth diode; an eighth diode, an anode of which is connected to the positive input terminal of the third comparator; a ninth diode, a cathode of which is connected with the first end of the start control circuit; and the first end of the second voltage-stabilizing tube is also connected with an external power supply through a twentieth resistor, and the third end of the second voltage-stabilizing tube is grounded.
In one embodiment, the start-up control circuit includes: the control end of the third switching tube is respectively connected with the first end of the fourth capacitor, the first end of the twenty-fourth resistor and the fourth end of the voltage comparison circuit, the first end of the third switching tube is connected with the control end of the energy taking power supply, and the second end of the third switching tube is grounded; a second end of the fourth capacitor is grounded; and a twenty-fourth resistor having a second terminal connected to ground.
The technical scheme of the invention has the following advantages:
according to the self-checking circuit of the energy taking power supply of the flexible direct current converter valve, the overvoltage self-checking circuit acquires the power supply voltage of the energy taking power supply, compares the power supply voltage of the energy taking power supply with the reference voltage, and outputs an overvoltage signal when the power supply voltage of the energy taking power supply is greater than the reference voltage; the undervoltage self-checking circuit collects the power supply voltage of the energy taking power supply, compares the power supply voltage of the energy taking power supply with the reference voltage, and outputs an undervoltage signal when the power supply voltage of the energy taking power supply is smaller than the reference voltage; the control circuit outputs a turn-off signal to the energy taking power supply based on the overvoltage signal, and the turn-off signal is used for controlling the energy taking power supply to stop working; the information return circuit sends the undervoltage signal or the overvoltage signal to a control system of the flexible direct current converter, so that the functions of self-detection of the energy-taking power supply state and timely reporting of the abnormal state are realized, timely and accurate judgment is provided for protection of the converter valve controller, and the occurrence of fault shutdown events with unknown reasons is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a composition diagram of a specific example of a self-test circuit of an energy-obtaining power supply of a flexible dc converter valve according to an embodiment of the present invention;
fig. 2 is a specific circuit topology diagram of the over-voltage self-test circuit and the under-voltage self-test circuit according to the embodiment of the present invention;
fig. 3 is a composition diagram of another specific example of a self-test circuit of the power supply for the flexible dc converter valve according to the embodiment of the present invention;
fig. 4 is a composition diagram of another specific example of a self-test circuit of the power supply for the flexible dc converter valve according to the embodiment of the present invention;
fig. 5 is a composition diagram of another specific example of a self-test circuit for an energy-obtaining power supply of a flexible dc converter valve according to an embodiment of the present invention;
fig. 6 is a composition diagram of another specific example of a self-test circuit of the power supply for the flexible dc converter valve according to the embodiment of the present invention;
fig. 7 is a specific circuit topology diagram of the startup self-test circuit according to the embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Examples
The embodiment of the invention provides a self-checking circuit of a flexible direct current converter valve energy-obtaining power supply, which is mainly composed of a DC-DC power converter, an output filtering voltage conversion circuit, a power device driving circuit and the like, wherein the power device driving circuit is used for driving power electronic devices in the DC-DC power converter so that the DC-DC power converter outputs voltage of a corresponding grade or stops outputting voltage, and the output filtering voltage conversion circuit is used for filtering the output voltage of the DC-DC power converter. The DC-DC power converter may draw an input high voltage from the flexible DC converter valve power module DC support capacitor.
As shown in fig. 2, the self-test circuit of the energy-obtaining power supply of the flexible dc converter valve comprises: the circuit comprises a reference circuit 1, an overvoltage self-checking circuit 2, an undervoltage self-checking circuit 3, a control circuit 4 and an information reporting circuit 5.
As shown in fig. 2, a first terminal of a reference circuit 1 is connected to an output terminal of an energy-taking power supply, and the reference circuit 1 is configured to convert a supply voltage of the energy-taking power supply into a reference voltage; the reference circuit 1 of the embodiment of the present invention may also be implemented by using a programmable reference source, and the reference voltage may be set according to an actual working condition, which is not limited herein.
As shown in fig. 2, a first end of the overvoltage self-checking circuit 2 is connected with an output end of the energy-taking power supply, a second end of the overvoltage self-checking circuit 2 is connected with a second end of the reference circuit 1, a third end of the overvoltage self-checking circuit 2 is connected with an external power supply, the overvoltage self-checking circuit 2 is used for collecting a power supply voltage of the energy-taking power supply, comparing the power supply voltage of the energy-taking power supply with the reference voltage, and outputting an overvoltage signal when the power supply voltage of the energy-taking power supply is greater than the reference voltage.
As shown in fig. 2, the first end of the undervoltage self-checking circuit 3 is connected with the output end of the energy-taking power supply, the second end of the undervoltage self-checking circuit 3 is connected with the second end of the reference circuit 1, the third end of the undervoltage self-checking circuit 3 is connected with the external power supply, the undervoltage self-checking circuit 3 is used for collecting the power supply voltage of the energy-taking power supply, comparing the power supply voltage of the energy-taking power supply with the reference voltage, and outputting an undervoltage signal when the power supply voltage of the energy-taking power supply is smaller than the reference voltage.
As shown in fig. 2, a first end of the control circuit 4 is connected to the fourth end of the overvoltage self-test circuit 2, a second end of the control circuit 4 is connected to the control end of the energy-taking power supply, the control circuit 4 is configured to output a turn-off signal to the energy-taking power supply based on the overvoltage signal, and the turn-off signal is configured to control the energy-taking power supply to stop working.
Specifically, when the energy-obtaining power source of the flexible DC converter valve is mostly composed of a DC-DC power converter, an output filter voltage converting circuit, a power device driving circuit, etc., the second end of the control circuit 4 is actually connected to the power device driving circuit, and the power device driving circuit controls devices such as a power electronic switch inside the DC-DC power converter to stop working based on the turn-off signal.
As shown in fig. 2, a first end of the information reporting circuit 5 is connected to a fifth end of the overvoltage self-test circuit 2, a second end of the information reporting circuit 5 is connected to a fourth end of the undervoltage self-test circuit 3, a fourth end of the information reporting circuit 5 is connected to a control system of the flexible dc converter, and the information reporting circuit 5 is configured to send the undervoltage signal or the overvoltage signal to the control system of the flexible dc converter.
Specifically, when the output voltage of the energy-taking power supply is overvoltage or undervoltage, that is, when the information reporting circuit 5 receives an overvoltage signal or an undervoltage signal, the information reporting circuit 5 converts the received signals into optical signals, and sends the optical signals to the control system of the flexible dc converter, where the control system may be a power module controller or a valve controller, so as to be used as input information for determining the state of the energy-taking power supply.
In one embodiment, as shown in fig. 2, the reference circuit 1 includes: a first diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a first voltage regulator Z1.
As shown in fig. 2, an anode of the first diode D1 is connected to an output terminal (Vbus terminal in fig. 2) of the energy-extracting power supply, and a cathode of the first diode D1 is connected to a first terminal of the first resistor R1 and a first terminal of the second resistor R2, respectively; a first end of a third resistor R3 is respectively connected with a second end of the first resistor R1, a second end of the second resistor R2 and a first end of a first capacitor C1, and a second end of the third resistor R3 is connected with a first end of a first voltage regulator tube Z1; the second end of the first capacitor C1 is grounded; the first end of the first regulator tube Z1 and the second end of the first regulator tube Z1 are both connected with the second end (the first end of R4 in fig. 2) of the overvoltage self-test circuit 2 and the first end (one end of R8 in fig. 2) of the undervoltage self-test circuit 3, and the third end of the first regulator tube Z1 is grounded.
Specifically, in fig. 2, the one-way conductivity of the first diode D1 can limit that when the voltage of the self-test circuit is too large, the one-way conductivity of the first diode D1 can prevent the too large voltage from being reversely applied to the energy-taking power supply to damage the energy-taking power supply.
In one embodiment, as shown in fig. 3, the self-test circuit 2 for overvoltage includes: an overvoltage acquisition circuit 21 and an overvoltage comparison circuit 22.
As shown in fig. 3, a first end of the overvoltage acquisition circuit 21 is connected to an output end of the energy-obtaining power supply, a second end of the overvoltage acquisition circuit 21 is connected to a first end of the overvoltage comparison circuit 22, and the overvoltage acquisition circuit 21 is configured to acquire a supply voltage of the energy-obtaining power supply.
Specifically, the overvoltage collecting circuit 21 may be a voltage collecting circuit formed by a voltage transformer, or may be a voltage collecting circuit formed by a voltage dividing circuit, which is not limited herein.
As shown in fig. 3, the second end of the overvoltage comparison circuit 22 is connected to the second end of the reference circuit 1, the third end of the overvoltage comparison circuit 22 is connected to an external power source, the fourth end of the overvoltage comparison circuit 22 is connected to the first end of the control circuit 4, the fifth end of the overvoltage comparison circuit 22 is connected to the first end of the information reporting circuit 5, the overvoltage comparison circuit 22 is configured to compare the supply voltage of the energy-obtaining power source with the reference voltage, and when the supply voltage of the energy-obtaining power source is greater than the reference voltage, an overvoltage signal is output.
As shown in fig. 2, the overvoltage comparing circuit 22 includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second diode D2, a third diode D3, a fourth diode D4 and a first comparator U1.
As shown in fig. 2, a forward input terminal of the first comparator U1 is connected to the second terminal of the overvoltage collecting circuit 21 through a fifth resistor R5, a reverse input terminal of the first comparator U1 is connected to the second terminal (one terminal of Z1 in fig. 2) of the reference circuit 1 through a fourth resistor R4, an output terminal of the first comparator U1 is connected to an external power supply (the terminal of VCC1 in fig. 2) through a sixth resistor R6, and an output terminal of the first comparator U1 is connected to an anode of the second diode D2, an anode of the third diode D3, and an anode of the fourth diode D4; the cathode of the second diode D2 is connected with the first end of the information reporting circuit 5; the cathode of the third diode D3 is connected to the first terminal (the first terminal of R12 in fig. 2) of the control circuit 4; the cathode of the fourth diode D4 is connected to the positive input of the first comparator U1 via a seventh resistor R7.
Specifically, in the overvoltage self-detection process, a reference voltage output by the reference circuit 1 is limited by the fourth resistor R4 and then input to the reverse input end of the first comparator U1, a supply voltage of the energy-obtaining power collected by the overvoltage collection circuit 21 is limited by the fifth resistor R5 and then input to the forward input end of the first comparator U1, the first comparator U1 compares the reference voltage with the supply voltage of the energy-obtaining power, when the supply voltage of the energy-obtaining power is higher than the reference voltage, the output end of the first comparator U1 outputs an overvoltage signal, the overvoltage signal is output in three paths through the second diode D2, the third diode D3 and the fourth diode D4, wherein the second diode D2 sends the overvoltage signal to the return circuit, and the signal return circuit carries out photoelectric conversion on the overvoltage signal and then sends the overvoltage signal to the control system; the third diode D3 transmits the overvoltage signal to the control circuit 4, the control circuit 4 outputs a turn-off signal to the energy-taking power supply based on the overvoltage signal, and the turn-off signal is used for controlling the energy-taking power supply to stop working; the fourth diode D4 is connected in series with the seventh resistor R7 and feeds the overvoltage signal back to the positive input of the first comparator U1.
In one embodiment, as shown in fig. 4, the brown-out self-test circuit 3 includes: the undervoltage acquisition circuit 31 and the undervoltage comparison circuit 32.
As shown in fig. 4, a first end of the under-voltage collecting circuit 31 is connected to an output end of the energy-taking power supply, a second end of the under-voltage collecting circuit 31 is connected to a first end of the under-voltage comparing circuit 32, and the under-voltage collecting circuit 31 is configured to collect a supply voltage of the energy-taking power supply.
Specifically, the undervoltage collecting circuit 31 may be formed by a voltage collecting circuit formed by a voltage transformer, or may be formed by a voltage collecting circuit formed by a voltage dividing circuit, which is not limited herein.
As shown in fig. 4, the second end of the under-voltage comparison circuit 32 is connected to the second end of the reference circuit 1, the third end of the under-voltage comparison circuit 32 is connected to the external power supply, the fourth end of the under-voltage comparison circuit 32 is connected to the second end of the information reporting circuit 5, the under-voltage comparison circuit 32 is configured to compare the power supply voltage of the energy-taking power supply with the reference voltage, and output an under-voltage signal when the power supply voltage of the energy-taking power supply is smaller than the reference voltage.
As shown in fig. 2, the undervoltage comparison circuit 32 includes: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a fifth diode D5 and a second comparator U2.
As shown in fig. 2, the forward input terminal of the second comparator U2 is connected to the second terminal (one terminal of U1 in fig. 2) of the reference circuit 1 through an eighth resistor R8, the reverse input terminal of the second comparator U2 is connected to the second terminal of the undervoltage collecting circuit 31 through a ninth resistor R9, the output terminal of the second comparator U2 is connected to the forward input terminal thereof through a tenth resistor R10, the output terminal of the second comparator U2 is further connected to an external power supply (the terminal VCC1 in fig. 2) through an eleventh resistor R11, and the output terminal of the second comparator U63 2 is further connected to the anode of the fifth diode D5; the cathode of the fifth diode D5 is connected to the second terminal of the information reporting circuit 5.
Specifically, in the undervoltage self-checking process, the reference voltage output by the reference circuit 1 is limited by the eighth resistor R8 and then input to the forward input end of the second comparator U2, the power supply voltage of the energy-taking power source acquired by the undervoltage acquisition circuit 31 is limited by the first resistor and then input to the reverse input end of the second comparator U2, the reference voltage and the power supply voltage of the energy-taking power source are compared by the second comparator U2, when the power supply voltage of the energy-taking power source is lower than the reference voltage, the output end of the second comparator U2 outputs an undervoltage signal, the undervoltage signal is output to the signal reporting circuit through the fifth diode D5, and the signal reporting circuit performs photoelectric conversion on the undervoltage signal and then sends the undervoltage signal to the control system.
Specifically, the tenth resistor R10 and the eleventh resistor R11 in fig. 2 form a resistor hysteresis loop of the second comparator U2, so as to ensure that the initial voltage after the start of the energy-taking power supply is consistent with the blocking voltage after the stop, and no large deviation occurs.
In one embodiment, as shown in fig. 2, the control circuit 4 includes: the circuit comprises a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a second capacitor C2, an optical coupling isolation chip U4, a first switch tube T1 and a second switch tube T2.
As shown in fig. 2, a control terminal of the first switch tube T1 is connected to a fourth terminal (one terminal of D3 in fig. 2) of the overvoltage self-test circuit 2 through a twelfth resistor R12, a first terminal of the first switch tube T1 is connected to an external power supply (Vcc 1 in fig. 2) through a thirteenth resistor R13, and a second terminal of the first switch tube T1 is connected to a first terminal of the opto-coupler isolation chip U4; the second end of the optical coupling isolation chip U4 is grounded, the third end of the optical coupling isolation chip U4 is connected with an external power supply (VCC _ VH end in fig. 2) through a fourteenth resistor R14, and the fourth end of the optical coupling isolation chip U4 is grounded; the control end of a second switch tube T2 is connected with the third end of the optical coupling isolation chip U4, the control end of a second switch tube T2 is also connected with the first end of a second capacitor C2 and the first end of a fifteenth resistor R15 respectively, the first end of a second switch tube T2 is connected with the control end of the energy-taking power supply, and the second end of a second switch tube T2 is grounded; the second end of the second capacitor C2 is grounded; a second end of the fifteenth resistor R15 is connected to ground.
Specifically, when the overvoltage self-checking circuit 2 outputs an overvoltage signal, the overvoltage signal drives the first switching tube T1 to be turned on, and after passing through a filter network formed by the optocoupler isolation chip U4, the second capacitor C2 and the fifteenth resistor R15, the overvoltage signal is transmitted to the control end of the second switching tube T2, at this time, the second switching tube T2 is turned on, the first end of the second switching tube T2 outputs a turn-off signal to the control end of the energy-taking power supply, and the turn-off signal is used for controlling the energy-taking power supply to stop working. When the energy-taking power supply of the flexible direct current converter valve is mainly composed of a DC-DC power converter, an output filtering voltage conversion circuit, a power device driving circuit and the like, a turn-off signal is transmitted to the power device driving circuit, the power device driving circuit stops working, and a power device (such as a power electronic switch) switch control command is not output any more.
Specifically, when the overvoltage self-detection circuit 2 does not output an overvoltage signal, the first switch tube T1 is turned off, the second switch tube T2 is turned off, the power device driving circuit works normally, a power device switch control command is output, and the energy-taking power supply works normally.
In one embodiment, as shown in fig. 5, the information reporting circuit 5 includes: or gate logic circuit 51, isolation circuit 52, optical signal transmission circuit 53.
As shown in fig. 5, a first end of the or gate logic circuit 51 is connected to the fifth end of the over-voltage self-test circuit 2, a second end of the or gate logic circuit 51 is connected to the fourth end of the under-voltage self-test circuit 3, and the or gate logic circuit 51 is configured to perform an or logic operation on the under-voltage signal and the over-voltage signal.
As shown in fig. 5, a first end of the optical signal transmitting circuit 53 is connected to a second end of the or gate logic circuit 51 through the isolation circuit 52, a second end of the optical signal transmitting circuit 53 is connected to the control system of the flexible dc-to-dc converter, and the optical signal transmitting circuit 53 is configured to transmit the under-voltage signal or the over-voltage signal to the control system of the flexible dc-to-dc converter.
Specifically, the optical signal transmitting circuit 53 may be a photoelectric conversion chip, and may convert the under-voltage signal or the over-voltage signal into an optical signal, and transmit the optical signal to the control system of the flexible dc converter, so as to be used as input information for the controller to determine the state of the energy-obtaining power supply.
In an embodiment, as shown in fig. 5, the self-test circuit of the energy-obtaining power supply of the flexible dc converter valve further includes:
as shown in fig. 5, a first end of the start self-checking circuit 6 is connected to an external power supply, a second end of the start self-checking circuit 6 inputs an input voltage of the energy-taking power supply, a third end of the start self-checking circuit 6 is connected to a control end of the energy-taking power supply, and the start self-checking circuit 6 is configured to collect the input voltage of the energy-taking power supply and divide the input voltage of the energy-taking power supply to obtain a divided voltage; converting the voltage of an external power supply into a starting reference voltage; and comparing the divided voltage with the starting reference voltage, and outputting a shutdown signal when the divided voltage is smaller than the starting reference voltage, wherein the shutdown signal is used for controlling the energy taking power supply to be shut down. The HV + terminal and the HV-terminal in fig. 5 are connected to two terminals of the dc support capacitor of the power module of the flexible dc converter valve, respectively.
Specifically, the energy-obtaining power supply in fig. 5 is exemplified by a DC-DC power converter, an output filter voltage converting circuit, and a power device driving circuit, after the input high voltage is obtained from the power module DC support capacitor, the stable and easy-to-detect DC voltage is obtained through the anti-reverse, filtering and voltage-equalizing circuits, the DC voltage passes through the start-up self-test circuit 6, the start-up self-test circuit 6 judges whether the divided voltage of the DC voltage reaches the start-up reference voltage, when the voltage is higher than the starting reference voltage, the power device driving circuit works normally, the DC-DC power converter is regulated and controlled to generate direct-current low voltage, when the voltage is lower than the starting reference voltage, the starting self-detection circuit 6 outputs a stop signal to the power device driving circuit, and the power device driving circuit stops outputting a control command of the internal power device of the DC-DC power converter based on the stop signal.
In one embodiment, the start self-test circuit 6 includes: voltage acquisition circuit, voltage comparison circuit and start control circuit.
Specifically, the first end of voltage acquisition circuit is connected with external power supply, and the input voltage of getting can the power is input to voltage acquisition circuit's second end, and voltage acquisition circuit's third end is connected with voltage comparison circuit's first end, and voltage acquisition circuit is used for gathering the input voltage of getting can the power to carry out the partial pressure to the input voltage who gets can the power, obtain partial pressure voltage.
Specifically, as shown in fig. 7, the voltage acquisition circuit includes: a sixth diode D6, a seventh diode D7, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18 and a third capacitor C3, wherein a first end of the seventeenth resistor R17 is connected to an anode of the sixth diode D6, a cathode of the seventh diode D7, a first end of the sixteenth resistor R16 and a first end of the third capacitor C3, respectively, and a second end of the seventeenth resistor R17 is connected to a first end of the eighteenth resistor R18; the cathode of the sixth diode D6 is connected with an external power supply; the anode of the seventh diode D7 is grounded; a second end of the sixteenth resistor R16 is connected with an external power supply; a second end of the eighteenth resistor R18 is grounded; the first terminal of the third capacitor C3 is also connected to the first terminal of the voltage comparison circuit (one terminal of R21 in fig. 7), and the second terminal of the third capacitor C3 is grounded.
Specifically, IN fig. 7, the terminal voltage of the dc support capacitor is input to the terminal VH _ IN, the terminal voltage of the dc support capacitor is divided by a voltage dividing circuit formed by a sixteenth resistor R16, a seventeenth resistor R17, and an eighteenth resistor R18, and the third capacitor C3 is connected IN parallel with the low-voltage-side resistor of the voltage dividing circuit, so that a stable divided voltage is obtained at the low-voltage-side resistor, and the divided voltage is limited by the upper and lower limits of a clamping circuit formed by a sixth diode D6 and a seventh diode D7, thereby preventing the voltage from exceeding the limits and burning the circuit.
Specifically, the second end and the third end of the voltage comparison circuit are both connected with an external power supply, and the fourth end of the voltage comparison circuit is connected with the first end of the starting control circuit and is used for converting the voltage of the external power supply into a starting reference voltage; and comparing the divided voltage with the starting reference voltage, and outputting a conducting signal when the divided voltage is smaller than the starting reference voltage.
Specifically, as shown in fig. 7, the voltage comparison circuit includes: a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, an eighth diode D8, a ninth diode D9, a second regulator tube Z2 and a third comparator U3, wherein a forward input end of the third comparator U3 is connected with a first end of the second regulator tube Z2 and a second end of the second regulator tube Z2 through the nineteenth resistor R19, a reverse input end of the third comparator U3 is connected with a third end (one end of C3, R17 and R16 in fig. 7) of the voltage acquisition circuit through the twenty-first resistor R21, an output end of the third comparator U3 is connected with a cathode of the eighth diode D8 through a twelfth resistor R22, an output end of the third comparator U3 is further connected with an external power supply through a thirteenth resistor R23, and an anode of the ninth comparator U3 is further connected with an anode 9D 9; the anode of the eighth diode D8 is connected to the positive input of the third comparator U3; a cathode of the ninth diode D9 is connected to a first terminal (one terminal of C4, R24, T3 in fig. 7) of the start control circuit; the first end of the second voltage-regulator tube Z2 is also connected with an external power supply through a twentieth resistor R20, and the third end is grounded.
Specifically, in fig. 7, the divided voltage is transmitted to the inverting input terminal of the third comparator U3, and at the same time, the clamp voltage input from the VCC _ VH terminal passes through the voltage stabilizing circuit formed by the twentieth resistor R20, the nineteenth resistor R19, and the second regulator tube Z2, and then outputs the start reference voltage to the forward input terminal of the third comparator U3, and the third comparator U3 compares the divided voltage with the start reference voltage, and when the divided voltage is lower than the start reference voltage, the third comparator U3 outputs a turn-on signal to the start control circuit.
Specifically, in fig. 7, the eighth diode D8 and the twenty-second resistor R22 form a single-phase hysteresis loop to prevent the reference voltage from drifting during the startup and shutdown of the energy-extracting power supply.
Specifically, the second end of the start control circuit is connected with the control end of the energy taking power supply, the start control circuit is used for being in a conducting state based on a conducting signal and outputting a stop signal, and the stop signal is used for controlling the energy taking power supply to stop.
Specifically, as shown in fig. 7, the start-up control circuit includes: a fourth capacitor C4, a twenty-fourth resistor R24 and a third switch tube T3, wherein a control terminal of the third switch tube T3 is respectively connected to a first terminal of the fourth capacitor C4, a first terminal of the twenty-fourth resistor R24 and a fourth terminal (one terminal of D9 in fig. 7) of the voltage comparison circuit, a first terminal of the third switch tube T3 is connected to a control terminal of the energy-extracting power supply, and a second terminal of the third switch tube T3 is grounded; the second end of the fourth capacitor C4 is grounded; a second terminal of the twenty-fourth resistor R24 is connected to ground.
Specifically, when the voltage comparison circuit converts the voltage of the external power supply into a starting reference voltage; the divided voltage is compared with the starting reference voltage, when the divided voltage is smaller than the starting reference voltage, the voltage comparison circuit outputs a conducting signal to the starting control circuit, the conducting signal is filtered through a filter network formed by a fourth capacitor C4 and a twenty-fourth resistor R24 and then is transmitted to a control end of a third switch tube T3, at the moment, the third switch tube T3 is conducted, and the energy taking power supply stops working, wherein when the energy taking power supply is formed by a DC-DC power converter, an output filter voltage conversion circuit and a power device driving circuit, when the third switch tube is conducted, the power device driving circuit is pulled down to be grounded and stops working, and no power device control command is output.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (13)
1. A self-checking circuit of a flexible direct current converter valve energy taking power supply is characterized by comprising: a reference circuit, an over-voltage self-checking circuit, an under-voltage self-checking circuit, a control circuit and an information reporting circuit, wherein,
the first end of the reference circuit is connected with the output end of the energy-taking power supply and is used for converting the power supply voltage of the energy-taking power supply into reference voltage;
the overvoltage self-checking circuit is connected with the output end of the energy taking power supply at the first end, connected with the second end of the reference circuit at the second end and connected with an external power supply at the third end, and used for collecting the power supply voltage of the energy taking power supply, comparing the power supply voltage of the energy taking power supply with the reference voltage and outputting an overvoltage signal when the power supply voltage of the energy taking power supply is greater than the reference voltage;
the undervoltage self-checking circuit is connected with the output end of the energy taking power supply at a first end, connected with the second end of the reference circuit at a second end and connected with an external power supply at a third end, and used for acquiring the power supply voltage of the energy taking power supply, comparing the power supply voltage of the energy taking power supply with the reference voltage, and outputting an undervoltage signal when the power supply voltage of the energy taking power supply is smaller than the reference voltage;
the first end of the control circuit is connected with the fourth end of the overvoltage self-detection circuit, the second end of the control circuit is connected with the control end of the energy taking power supply, the control circuit is used for outputting a turn-off signal to the energy taking power supply based on the overvoltage signal, and the turn-off signal is used for controlling the energy taking power supply to stop working;
and the first end of the information reporting circuit is connected with the fifth end of the overvoltage self-checking circuit, the second end of the information reporting circuit is connected with the fourth end of the undervoltage self-checking circuit, the fourth end of the information reporting circuit is connected with the control system of the flexible direct current converter, and the information reporting circuit is used for sending the undervoltage signal or the overvoltage signal to the control system of the flexible direct current converter.
2. The self-test circuit of the flexible direct current converter valve power supply according to claim 1, wherein the reference circuit comprises: a first diode, a first resistor, a second resistor, a third resistor, a first capacitor and a first voltage regulator tube,
the anode of the first diode is connected with the output end of the energy-taking power supply, and the cathode of the first diode is respectively connected with the first end of the first resistor and the first end of the second resistor;
a first end of the third resistor is connected with a second end of the first resistor, a second end of the second resistor and a first end of the first capacitor respectively, and a second end of the third resistor is connected with a first end of the first voltage regulator tube;
a first capacitor, the second end of which is grounded;
and the first end and the second end of the first voltage-stabilizing tube are connected with the second end of the overvoltage self-checking circuit and the first end of the undervoltage self-checking circuit, and the third end of the first voltage-stabilizing tube is grounded.
3. The self-test circuit of the flexible direct current converter valve energy-obtaining power supply according to claim 1, wherein the overvoltage self-test circuit comprises: an overvoltage acquisition circuit and an overvoltage comparison circuit, wherein,
the first end of the overvoltage acquisition circuit is connected with the output end of the energy taking power supply, the second end of the overvoltage acquisition circuit is connected with the first end of the overvoltage comparison circuit, and the overvoltage acquisition circuit is used for acquiring the power supply voltage of the energy taking power supply;
and the second end of the overvoltage comparison circuit is connected with the second end of the reference circuit, the third end of the overvoltage comparison circuit is connected with an external power supply, the fourth end of the overvoltage comparison circuit is connected with the first end of the control circuit, the fifth end of the overvoltage comparison circuit is connected with the first end of the information reporting circuit, the overvoltage comparison circuit is used for comparing the power supply voltage of the energy taking power supply with the reference voltage, and when the power supply voltage of the energy taking power supply is greater than the reference voltage, an overvoltage signal is output.
4. The self-test circuit of the flexible direct current converter valve energy-taking power supply according to claim 3, wherein the overvoltage comparison circuit comprises: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second diode, a third diode, a fourth diode and a first comparator,
a positive input end of the first comparator is connected with the second end of the overvoltage acquisition circuit through the fifth resistor, a negative input end of the first comparator is connected with the second end of the reference circuit through the fourth resistor, an output end of the first comparator is connected with an external power supply through the sixth resistor, and an output end of the first comparator is connected with an anode of the second diode, an anode of the third diode and an anode of the fourth diode;
a second diode, the cathode of which is connected with the first end of the information reporting circuit;
a third diode having a cathode connected to the first end of the control circuit;
and the cathode of the fourth diode is connected with the positive input end of the first comparator through the seventh resistor.
5. The self-test circuit of the flexible direct current converter valve energy-taking power supply according to claim 1, wherein the undervoltage self-test circuit comprises: an under-voltage acquisition circuit, an under-voltage comparison circuit, wherein,
the first end of the under-voltage acquisition circuit is connected with the output end of the energy-taking power supply, and the second end of the under-voltage acquisition circuit is connected with the first end of the under-voltage comparison circuit and is used for acquiring the power supply voltage of the energy-taking power supply;
and the second end of the under-voltage comparison circuit is connected with the second end of the reference circuit, the third end of the under-voltage comparison circuit is connected with an external power supply, the fourth end of the under-voltage comparison circuit is connected with the second end of the information reporting circuit, the under-voltage comparison circuit is used for comparing the power supply voltage of the energy taking power supply with the reference voltage, and when the power supply voltage of the energy taking power supply is smaller than the reference voltage, an under-voltage signal is output.
6. The self-test circuit of the flexible direct current converter valve energy-taking power supply according to claim 5, wherein the under-voltage comparison circuit comprises: an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a fifth diode, and a second comparator,
a positive input end of the second comparator is connected with the second end of the reference circuit through the eighth resistor, a negative input end of the second comparator is connected with the second end of the undervoltage acquisition circuit through the ninth resistor, an output end of the second comparator is connected with the positive input end of the undervoltage acquisition circuit through the tenth resistor, an output end of the second comparator is further connected with an external power supply through the eleventh resistor, and an output end of the second comparator is further connected with an anode of the fifth diode;
and the cathode of the fifth diode is connected with the second end of the information reporting circuit.
7. The self-test circuit of the flexible direct current converter valve power supply according to claim 1, wherein the control circuit comprises: a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a second capacitor, an optical coupling isolation chip, a first switch tube and a second switch tube,
a control end of the first switch tube is connected with a fourth end of the overvoltage self-detection circuit through the twelfth resistor, a first end of the first switch tube is connected with an external power supply through the thirteenth resistor, and a second end of the first switch tube is connected with a first end of the optical coupling isolation chip;
the second end of the optical coupling isolation chip is grounded, the third end of the optical coupling isolation chip is connected with an external power supply through the fourteenth resistor, and the fourth end of the optical coupling isolation chip is grounded;
a control end of the second switch tube is connected with a third end of the optical coupling isolation chip, a control end of the second switch tube is also connected with a first end of the second capacitor and a first end of the fifteenth resistor respectively, a first end of the second switch tube is connected with a control end of the energy taking power supply, and a second end of the second switch tube is grounded;
a second capacitor, a second end of which is grounded;
and a fifteenth resistor having a second terminal connected to ground.
8. The self-test circuit for the power source of the flexible direct current converter valve according to claim 1, wherein the information reporting circuit comprises: or gate logic, isolation circuitry, optical signal transmission circuitry, wherein,
the first end of the OR gate logic circuit is connected with the fifth end of the overvoltage self-detection circuit, the second end of the OR gate logic circuit is connected with the fourth end of the undervoltage self-detection circuit, and the OR gate logic circuit is used for carrying out OR logic operation on the undervoltage signal and the overvoltage signal;
and the first end of the optical signal transmitting circuit is connected with the second end of the OR gate logic circuit through the isolation circuit, the second end of the optical signal transmitting circuit is connected with the control system of the flexible direct current converter, and the optical signal transmitting circuit is used for transmitting the undervoltage signal or the overvoltage signal to the control system of the flexible direct current converter.
9. The self-test circuit of the flexible direct current converter valve energy-taking power supply according to claim 1, further comprising:
the self-checking circuit is started, a first end of the self-checking circuit is connected with an external power supply, a second end of the self-checking circuit inputs the input voltage of the energy taking power supply, a third end of the self-checking circuit is connected with a control end of the energy taking power supply, and the self-checking circuit is used for collecting the input voltage of the energy taking power supply and dividing the input voltage of the energy taking power supply to obtain divided voltage; converting the voltage of an external power supply into a starting reference voltage; and comparing the divided voltage with the starting reference voltage, and outputting a shutdown signal when the divided voltage is smaller than the starting reference voltage, wherein the shutdown signal is used for controlling the energy taking power supply to be shut down.
10. The self-test circuit for the power source of the flexible direct current converter valve according to claim 9, wherein the startup self-test circuit comprises: a voltage acquisition circuit, a voltage comparison circuit and a start control circuit, wherein,
the voltage acquisition circuit is used for acquiring the input voltage of the energy taking power supply and dividing the input voltage of the energy taking power supply to obtain divided voltage;
the second end and the third end of the voltage comparison circuit are both connected with an external power supply, and the fourth end of the voltage comparison circuit is connected with the first end of the starting control circuit and is used for converting the voltage of the external power supply into a starting reference voltage; comparing the divided voltage with the starting reference voltage, and outputting a conducting signal when the divided voltage is smaller than the starting reference voltage;
and the second end of the starting control circuit is connected with the control end of the energy taking power supply, the starting control circuit is used for being in a conducting state based on the conducting signal and outputting a stop signal, and the stop signal is used for controlling the energy taking power supply to stop.
11. The self-test circuit of the flexible direct current converter valve power supply according to claim 10, wherein the voltage acquisition circuit comprises: a sixth diode, a seventh diode, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor and a third capacitor, wherein,
a seventeenth resistor, a first end of which is connected to the anode of the sixth diode, the cathode of the seventh diode, a first end of the sixteenth resistor, and a first end of the third capacitor, respectively, and a second end of which is connected to the first end of the eighteenth resistor;
the cathode of the sixth diode is connected with an external power supply;
a seventh diode having an anode grounded;
a sixteenth resistor, a second end of which is connected with an external power supply;
an eighteenth resistor, a second end of which is grounded;
and the first end of the third capacitor is also connected with the first end of the voltage comparison circuit, and the second end of the third capacitor is grounded.
12. The self-test circuit of the flexible direct current converter valve power supply according to claim 10, wherein the voltage comparison circuit comprises: a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, an eighth diode, a ninth diode, a second voltage regulator tube and a third comparator,
a forward input end of the third comparator is connected with the first end of the second voltage-stabilizing tube and the second end of the second voltage-stabilizing tube through the nineteenth resistor, a reverse input end of the third comparator is connected with the third end of the voltage acquisition circuit through the twenty-first resistor, an output end of the third comparator is connected with a cathode of the eighth diode through the twenty-second resistor, an output end of the third comparator is further connected with an external power supply through the twenty-third resistor, and an output end of the third comparator is further connected with an anode of the ninth diode;
an eighth diode, an anode of which is connected to the positive input terminal of the third comparator;
a ninth diode, a cathode of which is connected to the first end of the start control circuit;
and the first end of the second voltage-stabilizing tube is also connected with an external power supply through the twentieth resistor, and the third end of the second voltage-stabilizing tube is grounded.
13. The self-test circuit for the power supply of the flexible direct current converter valve according to claim 10, wherein the starting control circuit comprises: a fourth capacitor, a twenty-fourth resistor and a third switch tube, wherein,
a third switching tube, a control end of which is connected to the first end of the fourth capacitor, the first end of the twenty-fourth resistor, and the fourth end of the voltage comparison circuit, respectively, a first end of which is connected to the control end of the energy-taking power supply, and a second end of which is grounded;
a second end of the fourth capacitor is grounded;
and a twenty-fourth resistor having a second terminal connected to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210681521.2A CN115000914A (en) | 2022-06-15 | 2022-06-15 | Self-checking circuit of flexible direct current converter valve energy taking power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210681521.2A CN115000914A (en) | 2022-06-15 | 2022-06-15 | Self-checking circuit of flexible direct current converter valve energy taking power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115000914A true CN115000914A (en) | 2022-09-02 |
Family
ID=83035108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210681521.2A Pending CN115000914A (en) | 2022-06-15 | 2022-06-15 | Self-checking circuit of flexible direct current converter valve energy taking power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115000914A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116819166A (en) * | 2023-08-31 | 2023-09-29 | 苏州贝克微电子股份有限公司 | High-voltage end undervoltage detection circuit |
-
2022
- 2022-06-15 CN CN202210681521.2A patent/CN115000914A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116819166A (en) * | 2023-08-31 | 2023-09-29 | 苏州贝克微电子股份有限公司 | High-voltage end undervoltage detection circuit |
| CN116819166B (en) * | 2023-08-31 | 2023-11-03 | 苏州贝克微电子股份有限公司 | High-voltage end undervoltage detection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2008122189A1 (en) | An output protection circuit for a power supply converter | |
| CN115000914A (en) | Self-checking circuit of flexible direct current converter valve energy taking power supply | |
| CN212085799U (en) | AC input over-voltage and under-voltage self-recovery protection circuit and state indication alarm function circuit | |
| WO2023077929A1 (en) | Modular power supply output protection circuit | |
| CN112421755A (en) | Power supply system for electric power monitoring based on Internet of things | |
| CN111130197B (en) | Intelligent power supply device of distribution automation terminal and battery evaluation method | |
| CN212875483U (en) | CT power supply | |
| CN219918495U (en) | Dual-power automatic switching circuit | |
| CN110557058B (en) | Starting protection circuit of direct-current brushless motor | |
| CN108982981A (en) | A kind of lack detection circuit of multiple pulse rectification circuit | |
| CN219997194U (en) | Power supply abnormality detection circuit, power supply circuit, and monitoring device | |
| CN111416422A (en) | Power supply switching circuit and power supply system | |
| US20230088540A1 (en) | Fault handling system of solid-state transformer | |
| CN217278841U (en) | Power failure detection circuit, device and equipment for kilomega industrial switch | |
| CN217087492U (en) | Over-voltage and under-voltage protection circuit and power supply equipment | |
| CN112104022B (en) | CT power taking power supply | |
| CN114915153A (en) | Protection circuit of switching power supply and electronic equipment | |
| CN212543435U (en) | Multifunctional contactor type alternating current power supply mutual-throw device | |
| CN220692829U (en) | Auxiliary power supply protection circuit and auxiliary power supply | |
| CN109347329A (en) | A kind of converter for DC to DC | |
| CN214150848U (en) | Current detection circuit | |
| CN216599410U (en) | Power supply module with input voltage malfunction identification capability | |
| CN218767249U (en) | Power supply test circuit and device | |
| CN220022325U (en) | External intelligent residual voltage device for power distribution terminal | |
| CN210468787U (en) | Direct current power supply output overvoltage protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |