CN114094859A - Power supply circuit of flexible direct-current transmission control panel - Google Patents
Power supply circuit of flexible direct-current transmission control panel Download PDFInfo
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- CN114094859A CN114094859A CN202111366553.5A CN202111366553A CN114094859A CN 114094859 A CN114094859 A CN 114094859A CN 202111366553 A CN202111366553 A CN 202111366553A CN 114094859 A CN114094859 A CN 114094859A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 69
- 239000003990 capacitor Substances 0.000 claims description 52
- 238000004146 energy storage Methods 0.000 claims description 37
- 238000004804 winding Methods 0.000 claims description 23
- 230000000087 stabilizing effect Effects 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/23—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in parallel
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- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a power supply circuit of a flexible direct-current transmission control board, which comprises a voltage power supply circuit and a current power supply circuit, wherein the voltage power supply circuit is connected with the current power supply circuit; the voltage supply circuit comprises a voltage converter and a high-level energy-taking power supply, wherein the input end of the voltage converter is connected with an external power supply, the output end of the voltage converter is connected with the high-level energy-taking power supply, the output end of the high-level energy-taking power supply is connected with the control panel, and the voltage converter is used for obtaining a voltage source from the external power supply and supplying power to the control panel through the high-level energy-taking power supply; the current power supply circuit comprises a current mutual inductance module and a current energy-taking power converter, the current mutual inductance module is arranged corresponding to an external power supply, the current energy-taking power converter is connected with the current mutual inductance module, the current energy-taking power converter is connected with the control panel, and the current mutual inductance module is used for obtaining a current source from the external power supply and supplying power to the control panel through the current energy-taking power converter. The voltage power supply circuit and the current power supply circuit are cooperated to supply power for circuits such as the control panel, and the appearance of a black module is avoided.
Description
Technical Field
The embodiment of the invention relates to a control panel power supply technology, in particular to a flexible direct current transmission control panel power supply circuit.
Background
The flexible direct current transmission is important equipment for constructing the intelligent power grid, compared with the traditional mode, the flexible direct current transmission has stronger technical advantages in aspects of island power supply, capacity increasing transformation of an urban power distribution network, interconnection of alternating current systems, large-scale wind power plant grid connection and the like, and is a strategic choice for changing the development pattern of a large power grid.
The flexible direct current transmission system consists of a submodule structure consisting of an IGBT (insulated gate bipolar transistor) and a drive circuit board thereof, a protective thyristor and a drive circuit board thereof, a submodule central control panel, a capacitor and the like, and a thyristor and a drive circuit thereof in the conventional direct current system. At present, the energy taking scheme of components such as a driving circuit board, a control board and the like of a flexible direct current transmission system is to take electricity from a power module capacitor. When the flexible direct current transmission converter valve system is used, when the power module is required to be powered on the flexible direct current transmission converter valve system and is in a working state and is not abnormal, the capacitor of the power module stores energy, and then the power module supplies power to the voltage energy-taking circuit, so that the flexible direct current transmission system can normally run.
In the prior art, components such as a driving circuit board, a control board and the like cannot obtain power supply due to the fact that a power module is in a bypass mode or fails, the components become black modules of the flexible direct current power transmission system, and normal and stable operation of the flexible direct current power transmission system is affected.
Disclosure of Invention
The invention provides a power supply circuit of a flexible direct-current power transmission control panel, which is used for realizing stable power supply of components such as a driving circuit board, the control panel and the like of a flexible direct-current power transmission system and avoiding the phenomenon of black modules.
In a first aspect, an embodiment of the present invention provides a power supply circuit for a flexible dc power transmission control board, including a voltage supply circuit and a current supply circuit;
the voltage power supply circuit comprises a voltage converter and a high-order energy-taking power supply, wherein the input end of the voltage converter is connected with an external power supply, the output end of the voltage converter is connected with the high-order energy-taking power supply, the output end of the high-order energy-taking power supply is connected with a control panel, and the voltage converter is used for obtaining a voltage source from the external power supply and supplying power to the control panel through the high-order energy-taking power supply;
the current power supply circuit comprises a current mutual inductance module and a current energy-taking power converter, the current mutual inductance module corresponds to the external power supply and is connected with the current mutual inductance module, the current energy-taking power converter is connected with the control panel, and the current mutual inductance module is used for obtaining a current source from the external power supply and supplying power to the control panel through the current energy-taking power converter.
Optionally, the voltage converter includes a first IGBT, a second IGBT, two freewheeling diodes, and a dc capacitor;
the first end of the first IGBT is connected with the direct current capacitor, the second end of the first IGBT is connected with the first end of the second IGBT, and the second end of the second IGBT is connected with the direct current capacitor;
the second end of the first IGBT and the first end of the second IGBT are connected with the first end of the external power supply, the second end of the second IGBT is connected with the second end of the external power supply, and the two freewheeling diodes are respectively connected with the first IGBT and the second IGBT in an inverse parallel mode.
Optionally, the voltage converter further includes a first bleeder resistor and a second bleeder resistor, and the first bleeder resistor and the second bleeder resistor are connected in parallel with the dc capacitor.
Optionally, the high-order energy-taking power supply includes a first power device, a second power device, a high-frequency transformer and at least two current-limiting diodes;
the first power device, the primary winding of the high-frequency transformer and the second power device are sequentially connected in series, the first power device and the second power device are respectively connected with the voltage converter, and at least two current-limiting diodes are respectively connected with at least two secondary windings of the high-frequency transformer in series.
Optionally, the current transformer module includes a current transformer, a rectifying unit and an energy storage unit, an input end of the current transformer is disposed corresponding to the external power supply, an output end of the current transformer is connected to the rectifying unit, an output end of the rectifying unit is connected to the energy storage unit, and an output end of the energy storage unit is connected to the current energy-taking power converter;
the current mutual inductance module is used for getting electricity through mutual inductance with the external power supply, and the rectifying unit is used for rectifying the current output by the current mutual inductance module into pulsating direct current to charge the energy storage unit.
Optionally, the current transformer module includes a primary winding and a secondary winding, the primary winding is connected in series with the output terminal of the external power supply, and the secondary winding is connected in series with the rectifier unit.
Optionally, the rectifying unit includes a first rectifying diode, a second rectifying diode, a third rectifying diode and a fourth rectifying diode;
the first rectifying diode, the second rectifying diode, the third rectifying diode and the fourth rectifying diode form a bridge circuit.
Optionally, the energy storage unit includes a filter diode and a filter energy storage capacitor, and the filter diode and the filter energy storage capacitor are connected in series.
Optionally, the energy storage unit further includes an overvoltage protection unit, where the overvoltage protection unit includes a first voltage regulator diode, an MOS transistor, a first current limiting resistor, and a second current limiting resistor;
the first voltage stabilizing diode is connected with the second current limiting resistor in series, and the first voltage stabilizing diode and the second current limiting resistor are connected with the filtering energy storage capacitor in parallel;
the source electrode and the grid electrode of the MOS tube are respectively connected with the output end of the rectifying unit, the drain electrode of the MOS tube is connected with the first current-limiting resistor, and the other end of the first current-limiting resistor is connected with the source electrode of the MOS tube;
the current energy-taking power converter collects the voltage value of the second current-limiting resistor, and when the voltage of the second current-limiting resistor reaches a preset overvoltage detection threshold value, the current energy-taking power converter sends a high-level signal to a grid electrode of the MOS tube, the MOS tube is conducted, and the rectifying unit is in short circuit to stop charging the filtering energy-storing capacitor.
Optionally, the power supply further comprises an enabling unit, wherein the enabling unit comprises a second voltage stabilizing diode, an enabling capacitor and a third current limiting resistor;
the second voltage stabilizing diode is connected with the third current limiting resistor in series, the second voltage stabilizing diode is connected with the energy storage unit in parallel with the third current limiting resistor, a connecting point of the second voltage stabilizing diode and the third current limiting resistor is connected with the current energy taking power converter, and the enabling capacitor is connected with the third current limiting resistor in parallel;
when the current energy-taking power converter detects that the voltage of the enabling capacitor reaches the enabling control threshold voltage of the current energy-taking power converter, the current energy-taking power converter is started to output electric energy to the control panel.
The power supply circuit of the flexible direct-current power transmission control panel comprises a voltage power supply circuit and a current power supply circuit, wherein the voltage power supply circuit can get power through a power module, the current power supply circuit can directly bypass the power module to get power from an external power supply, the situation that the components such as a driving circuit board and a control panel of the flexible direct-current power transmission system cannot be powered when the power module is in a bypass state or a fault state and the like is powered off is avoided, the components such as the driving circuit board and the control panel of the flexible direct-current power transmission system can always get energy through the voltage power supply circuit or the current power supply circuit, the normal work of the components such as the driving circuit board and the control panel of the flexible direct-current power transmission system is ensured, and black modules are avoided.
Drawings
Fig. 1 is a block diagram of a power supply circuit of a flexible dc power transmission control board according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another power supply circuit for a flexible dc power transmission control board according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.
The embodiment of the invention provides a power supply circuit for a flexible direct-current transmission control panel, which can be suitable for providing other power supply modes except for a power module for components such as a driving circuit board and the control panel in a flexible direct-current transmission system.
Wherein, black module is the unusual submodule piece of power-on initialization, and the fault reason includes: the embodiment of the invention mainly aims at the power failure that when the power module is used for supplying power originally, the power module is not electrified, the power-taking capacitor of the power module is not charged, and the components such as a driving circuit board and a control board cannot be supplied with power, so that the components such as the driving circuit board and the control board cannot be driven normally.
In order to make the skilled person better understand the embodiments of the present invention, the following describes the power supply circuit of the flexible dc power transmission control board provided by the present invention in detail with reference to specific embodiments:
fig. 1 is a block diagram of a power supply circuit of a flexible dc power transmission control board according to an embodiment of the present invention, and as shown in fig. 1, the power supply circuit of the flexible dc power transmission control board includes a voltage power supply circuit and a current power supply circuit.
The voltage supply circuit comprises a voltage converter and a high-level energy-taking power supply, the input end of the voltage converter is connected with an external power supply, the output end of the voltage converter is connected with the high-level energy-taking power supply, the output end of the high-level energy-taking power supply is connected with the control panel, and the voltage converter is used for acquiring a voltage source from the external power supply and supplying power to the control panel through the high-level energy-taking power supply. Illustratively, in the embodiment of the invention, the voltage converter is connected with an external power supply, and electric energy of the external power supply enters the high-level energy-taking power supply through the current converter to be converted into the voltage level required by driving components such as a circuit board, a control board and the like. The external power source may be an independently set power supply unit or may be a converter station in the flexible dc transmission system to obtain energy. The high-order energy-taking power supply is a special power supply applied to a converter valve of a flexible direct-current transmission system, the input power supply is from a voltage converter of the flexible direct-current transmission system, the input voltage range of the power supply is light, and the high-order energy-taking power supply can bear strong electromagnetic interference input in a high-voltage environment. Illustratively, the high-order energy-taking power supply can output a plurality of voltage levels so as to adapt to different voltage level requirements of components such as a driving circuit board and a control board of the flexible direct-current transmission system.
The current power supply circuit comprises a current mutual inductance module and a current energy-taking power converter, the current mutual inductance module is arranged corresponding to an external power supply, the current energy-taking power converter is connected with the current mutual inductance module, the current energy-taking power converter is connected with the control panel, and the current mutual inductance module is used for obtaining a current source from the external power supply and supplying power to the control panel through the current energy-taking power converter. Illustratively, the current mutual inductance module takes power from an external power supply based on the electromagnetic induction principle and enters a current energy taking power converter to be converted into the voltage grade required by components such as a driving circuit board and a control board of the flexible direct current transmission system. The current mutual inductance module can output a plurality of voltage levels as the high-level energy-taking power supply, and the output voltage level of the current mutual inductance module is the same as the output voltage level of the high-level energy-taking power supply. In other embodiments, the current transformer module and the high-level energy-taking power supply may be partially the same, and are not required to be enforced in the embodiments of the present invention.
Specifically, the voltage supply circuit and the current supply circuit can simultaneously or respectively provide electric energy for components such as a driving circuit board, a control board and the like of the flexible direct-current transmission system. That is, the drive circuit board, the control board and other components of the flexible dc power transmission system can obtain electric energy through the voltage supply circuit and/or the current supply circuit when starting.
Exemplarily, when the power module normally works to provide electric energy for the voltage supply circuit, the voltage supply circuit can provide electric energy for the components such as the driving circuit board and the control board of the flexible direct current transmission system, and when the power module works in a bypass mode or exits from running due to failure and the like and the voltage supply circuit cannot obtain electric energy, the current supply circuit can directly obtain electric energy from an external power source and convert the electric energy into the electric energy for the components such as the driving circuit board and the control board of the flexible direct current transmission system, so that the voltage level required by the components such as the driving circuit board and the control board of the flexible direct current transmission system to work can provide electric energy for the components such as the driving circuit board and the control board of the flexible direct current transmission system, the energy supply states of the components such as the driving circuit board and the control board of the flexible direct current transmission system are not influenced by the state of the power module, the working reliability of the components such as the driving circuit board and the control board of the flexible direct current transmission system can be ensured, and the operating reliability of the components such as the driving circuit board, the flexible direct current transmission system can be avoided, The control panel and other components can not obtain electric energy and become a black module.
In other examples, the power may be supplied by the cooperative work of the voltage supply circuit and the current supply circuit as a component such as a drive circuit board and a control board of the flexible dc power transmission system. For example, the voltage supply circuit and the current supply circuit intermittently switch to supply power, the voltage supply circuit and the current supply circuit simultaneously supply power, and the failure condition switches.
The power supply circuit for the flexible direct-current transmission control panel comprises a voltage power supply circuit and a current power supply circuit, wherein the voltage power supply circuit obtains electric energy from an external power supply through a voltage converter and converts the electric energy into working voltages of components such as a driving circuit board and a control panel of the flexible direct-current transmission system through a high-level energy-obtaining power supply, the current power supply circuit obtains the electric energy from the external power supply through a current mutual inductance module and the external power supply by utilizing the electromagnetic mutual inductance principle, and the working voltages of the components such as the driving circuit board and the control panel of the flexible direct-current transmission system are converted into the working voltages of the components such as the driving circuit board and the control panel of the flexible direct-current transmission system through a current energy-obtaining power converter, and the components such as the driving circuit board and the control panel of the flexible direct-current transmission system are provided with the voltage power supply circuit and the current power supply circuit, wherein the voltage power supply circuit and the current power supply circuit can cooperate to form the driving circuit board, the control panel of the flexible direct-current transmission system, The components such as the control panel supply power, so that the problem of black modules caused by the fact that the components such as the drive circuit board and the control panel of the flexible direct current transmission system cannot acquire electric energy due to bypass operation or fault state of the power module in the prior art is solved, and the operation stability of the flexible direct current transmission system is effectively improved.
In order to make the skilled person better understand the embodiments of the present invention, the following describes the power supply circuit of the flexible dc power transmission control board provided by the present invention in detail with reference to specific embodiments:
fig. 2 is a schematic structural diagram of another power supply circuit for a flexible dc power transmission control board according to an embodiment of the present invention, which specifically describes a voltage power supply circuit and a current power supply circuit on the basis of the above embodiment:
illustratively, as shown in fig. 2, the voltage converter of the voltage supply circuit includes a first IGBT, a second IGBT, two freewheeling diodes, and a dc capacitor. The first end of the first IGBT is connected with the direct current capacitor, the second end of the first IGBT is connected with the first end of the second IGBT, and the second end of the second IGBT is connected with the direct current capacitor. And the second end of the first IGBT and the first end of the second IGBT are connected with the first end of the external power supply, the second end of the second IGBT is connected with the second end of the external power supply, and the two freewheeling diodes are respectively connected with the first IGBT and the second IGBT in an inverse parallel mode.
An Insulated Gate Bipolar Transistor (IGBT) is a composite fully-controlled voltage-driven power semiconductor device consisting of a Bipolar Junction Transistor (BJT) and an insulated Gate field effect transistor (MOS), and has the advantages of high input impedance of the MOSFET and low conduction voltage drop of the GTR. The GTR saturation voltage is reduced, the current carrying density is high, but the driving current is large; the MOSFET has small driving power, high switching speed, large conduction voltage drop and small current carrying density. The IGBT integrates the advantages of the two devices, and has small driving power and reduced saturation voltage.
Illustratively, the collector of the first IGBT is a first end, the emitter of the first IGBT is a second end, the collector of the second IGBT is a first end, the emitter of the second IGBT is a second end, and the gates of the first IGBT and the second IGBT are connected to an external driving board for controlling the turn-on and turn-off of the first IGBT and the second IGBT. Anodes of the two freewheeling diodes are respectively connected with the second ends of the first IGBT and the second IGBT, and cathodes of the two freewheeling diodes are respectively connected with the first ends of the first IGBT and the second IGBT, so that the two freewheeling diodes are respectively connected with the first IGBT and the second IGBT in an inverse parallel mode.
Specifically, the external drive board drives the first IGBT to be turned on, the direct current capacitor is connected to an external power supply to be charged, and when the external drive board drives the first IGBT to be turned off and the second IGBT to be turned on, the direct current capacitor is short-circuited to stop charging. And two freewheeling diodes connected in anti-parallel with the first IGBT and the second IGBT can prevent gate-source voltage spikes from damaging the IGBTs.
In a specific implementation, the voltage converter may further include a first bleeder resistor and a second bleeder resistor, and the first bleeder resistor and the second bleeder resistor are connected in parallel with the dc capacitor. That is to say, two bleeder resistors are added in the voltage converter loop and are connected in parallel with the direct current capacitor, when the first IGBT and the second IGBT are both turned off or the external drive board drives the first IGBT to be turned off and the second IGBT to be turned on, the direct current capacitor is short-circuited and stops charging, the bleeder resistors and the direct current capacitor form a loop to discharge the voltage of the direct current capacitor, the direct current capacitor is prevented from being in a charging state all the time, and the safety of the circuit is improved.
In an embodiment of the present invention, the high-order energy-taking power supply may include a first power device, a second power device, a high-frequency transformer, and at least two current-limiting diodes. The first power device, the primary winding of the high-frequency transformer and the second power device are sequentially connected in series, the first power device and the second power device are respectively connected with the voltage converter, and the at least two current-limiting diodes are respectively connected with the at least two secondary windings of the high-frequency transformer in series.
Power devices, also called power electronic devices, are simply power semiconductor devices capable of handling high voltage and large current, and include high power transistors, thyristors, triacs, GTOs, MOSFETs, IGBTs, etc. The selection is made in the embodiment of the invention based on actual requirements. The first power device and the second power device are used for controlling whether a primary winding of the high-frequency transformer is connected to the direct-current capacitor or not, controlling whether power is taken from the direct-current capacitor or not, further performing voltage transformation processing through the high-frequency transformer, and further outputting voltages required by components such as a driving circuit board and a control board of the flexible direct-current transmission system.
In the embodiment of the invention, the current mutual inductance module comprises a current transformer, a rectifying unit and an energy storage unit, wherein the input end of the current transformer is arranged corresponding to an external power supply, the output end of the current transformer is connected with the rectifying unit, the output end of the rectifying unit is connected with the energy storage unit, and the output end of the energy storage unit is connected with the current energy-taking power converter.
Specifically, the current mutual inductance module is used for getting electricity through mutual inductance with an external power supply, the rectifying unit is used for rectifying current output by the current mutual inductance module into pulsating direct current to charge the energy storage unit, and then the current energy-taking power converter can get electricity from the energy storage unit and supply the electricity to components such as a driving circuit board and a control board of the flexible direct current power transmission system.
For example, the current transformer module T1 may include a primary winding connected in series with the output terminal of the external power source and a secondary winding connected in series with the rectifying unit. The current mutual inductance module T1 converts the current flowing in the primary winding into the secondary winding based on the electromagnetic induction principle, and then outputs the current to the rectifying unit for rectification.
Specifically, the primary winding of the current transformer module T1 may be connected to a circuit between the external power source and the voltage converter so that it may be inductively converted into a secondary winding circuit by the secondary winding of the current transformer module T1 when the external power source outputs current.
In an alternative embodiment of the present invention, the rectifying unit may include a first rectifying diode, a second rectifying diode, a third rectifying diode, and a fourth rectifying diode; the first rectifying diode, the second rectifying diode, the third rectifying diode and the fourth rectifying diode form a bridge circuit. That is, in this example, the rectifying unit is connected by a plurality of rectifying diodes in a bridge circuit connection to rectify the current output from the secondary winding of the current transformer module T1. In other embodiments, other structures of the rectifying unit may also be selected as long as the requirements of the current-energy-taking power converter in the embodiments of the present invention on the current can be met.
In the embodiment of the invention, the energy storage unit comprises a filtering diode and a filtering energy storage capacitor, and the filtering diode and the filtering energy storage capacitor are connected in series. The current can be charged and stored by setting the filtering energy storage capacitor by using the rectified current mutual inductance module output current, and the current can be further filtered by setting the filtering diode.
In an optional embodiment of the present invention, the energy storage unit further includes an overvoltage protection unit for preventing the energy storage unit from being continuously charged so that the voltage of the energy storage unit increases infinitely.
Specifically, the overvoltage protection unit comprises a first voltage stabilizing diode, an MOS (metal oxide semiconductor) tube, a first current limiting resistor and a second current limiting resistor. The first voltage stabilizing diode and the second current limiting resistor are connected in series, and the first voltage stabilizing diode and the second current limiting resistor are connected in parallel with the filtering energy storage capacitor; the source electrode and the grid electrode of the MOS tube are respectively connected with the output end of the rectifying unit, the drain electrode of the MOS tube is connected with the first current-limiting resistor, and the other end of the first current-limiting resistor is connected with the source electrode of the MOS tube.
In the specific implementation, the current energy-taking power converter is used for collecting the voltage value of the second current-limiting resistor, when the voltage of the second current-limiting resistor reaches a preset overvoltage detection threshold value, the current energy-taking power converter sends a high-level signal to a grid electrode of the MOS tube, a source electrode and a drain electrode of the MOS tube are conducted, the rectifying unit is in short circuit to stop charging the filtering energy-storing capacitor, and the filtering energy-storing capacitor continues to supply energy for the current energy-taking power converter. When the voltage of the filtering energy storage capacitor is reduced to be lower than the hysteresis voltage, the current energy-taking power converter sends a low-level signal to the grid electrode of the MOS tube, the source electrode and the drain electrode of the MOS tube are blocked, and the rectifying unit can continuously charge the filtering energy storage capacitor, so that stable energy supply of the filtering energy storage capacitor is ensured, and the current energy-taking power converter can work in a proper voltage range.
In an optional embodiment of the present invention, the apparatus may further include an enabling unit, and the enabling unit includes a second zener diode, an enabling capacitor, and a third current limiting resistor. The second voltage stabilizing diode and the third current limiting resistor are connected in series, the second voltage stabilizing diode and the third current limiting resistor are connected with the energy storage unit in parallel, the connecting point of the second voltage stabilizing diode and the third current limiting resistor is connected with the current energy taking power converter, and the enabling capacitor is connected with the third current limiting resistor in parallel.
Specifically, the current energy-taking power converter detects the voltage of the enabling capacitor, and when the current energy-taking power converter detects that the voltage of the enabling capacitor reaches the enabling control threshold voltage of the current energy-taking power converter, the current energy-taking power converter is started to output electric energy to the control board.
In the embodiment of the invention, rectifier diodes are further arranged between the high-level energy-taking power supply, the current energy-taking power converter and the components such as the driving circuit board and the control board of the flexible direct-current transmission system, and are used for rectifying the output current.
The power supply circuit for the flexible direct-current power transmission control panel comprises a voltage power supply circuit and a current power supply circuit, wherein the voltage power supply circuit can get power through a power module, the current power supply circuit can directly bypass the power module to get power from an external power supply, the situation that components such as a driving circuit board and a control panel of the flexible direct-current power transmission system cannot be powered when the power module is in a power loss state such as a bypass state or a fault state is avoided, the situation that the components such as the driving circuit board and the control panel of the flexible direct-current power transmission system can always get energy through the voltage power supply circuit or the current power supply circuit is guaranteed, the normal work of the components such as the driving circuit board and the control panel of the flexible direct-current power transmission system is guaranteed, and black modules are avoided.
In the description herein, it is to be understood that the terms "upper", "lower", "left", "right", and the like are based on the orientations and positional relationships shown in the drawings for convenience in description and simplicity in operation, and 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 invention.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it will be understood by those skilled in the art that the specification as a whole and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be taken in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A flexible direct current transmission control panel power supply circuit is characterized by comprising a voltage power supply circuit and a current power supply circuit;
the voltage power supply circuit comprises a voltage converter and a high-order energy-taking power supply, wherein the input end of the voltage converter is connected with an external power supply, the output end of the voltage converter is connected with the high-order energy-taking power supply, the output end of the high-order energy-taking power supply is connected with a control panel, and the voltage converter is used for obtaining a voltage source from the external power supply and supplying power to the control panel through the high-order energy-taking power supply;
the current power supply circuit comprises a current mutual inductance module and a current energy-taking power converter, the current mutual inductance module corresponds to the external power supply and is connected with the current mutual inductance module, the current energy-taking power converter is connected with the control panel, and the current mutual inductance module is used for obtaining a current source from the external power supply and supplying power to the control panel through the current energy-taking power converter.
2. The flexible direct current power transmission control board power supply circuit according to claim 1, wherein the voltage converter comprises a first IGBT, a second IGBT, two free-wheeling diodes and a direct current capacitor;
the first end of the first IGBT is connected with the direct current capacitor, the second end of the first IGBT is connected with the first end of the second IGBT, and the second end of the second IGBT is connected with the direct current capacitor;
the second end of the first IGBT and the first end of the second IGBT are connected with the first end of the external power supply, the second end of the second IGBT is connected with the second end of the external power supply, and the two freewheeling diodes are connected with the first IGBT and the second IGBT in an inverse parallel mode respectively.
3. The flexible direct current power transmission control board power supply circuit according to claim 2, wherein the voltage converter further comprises a first bleeder resistor and a second bleeder resistor, and the first bleeder resistor and the second bleeder resistor are connected in parallel with the direct current capacitor.
4. The flexible direct-current power transmission control board power supply circuit according to claim 1, wherein the high-order energy-taking power supply comprises a first power device, a second power device, a high-frequency transformer and at least two current-limiting diodes;
the first power device, the primary winding of the high-frequency transformer and the second power device are sequentially connected in series, the first power device and the second power device are respectively connected with the voltage converter, and at least two current-limiting diodes are respectively connected with at least two secondary windings of the high-frequency transformer in series.
5. The flexible direct-current power transmission control panel power supply circuit according to claim 1, wherein the current mutual inductance module comprises a current transformer, a rectifying unit and an energy storage unit, an input end of the current transformer is arranged corresponding to the external power supply, an output end of the current transformer is connected with the rectifying unit, an output end of the rectifying unit is connected with the energy storage unit, and an output end of the energy storage unit is connected with the current energy taking power converter;
the current mutual inductance module is used for getting electricity through mutual inductance with an external power supply, and the rectification unit is used for rectifying current output by the current mutual inductance module into pulsating direct current to charge the energy storage unit.
6. The flexible direct current power transmission control board supply circuit according to claim 5, wherein the current mutual inductance module comprises a primary winding and a secondary winding, the primary winding is connected in series with an output end of the external power supply, and the secondary winding is connected in series with the rectification unit.
7. The flexible direct current power transmission control board power supply circuit according to claim 5, wherein the rectifying unit includes a first rectifying diode, a second rectifying diode, a third rectifying diode, and a fourth rectifying diode;
the first rectifying diode, the second rectifying diode, the third rectifying diode and the fourth rectifying diode form a bridge circuit.
8. The flexible direct current power transmission control board power supply circuit according to claim 5, wherein the energy storage unit comprises a filter diode and a filter energy storage capacitor, and the filter diode and the filter energy storage capacitor are connected in series.
9. The flexible direct-current power transmission control board power supply circuit according to claim 8, wherein the energy storage unit further comprises an overvoltage protection unit, and the overvoltage protection unit comprises a first voltage-stabilizing diode, a MOS (metal oxide semiconductor) transistor, a first current-limiting resistor and a second current-limiting resistor;
the first voltage stabilizing diode is connected with the second current limiting resistor in series, and the first voltage stabilizing diode and the second current limiting resistor are connected with the filtering energy storage capacitor in parallel;
the source electrode and the grid electrode of the MOS tube are respectively connected with the output end of the rectifying unit, the drain electrode of the MOS tube is connected with the first current-limiting resistor, and the other end of the first current-limiting resistor is connected with the source electrode of the MOS tube;
the current energy-taking power converter collects the voltage value of the second current-limiting resistor, and when the voltage of the second current-limiting resistor reaches a preset overvoltage detection threshold value, the current energy-taking power converter sends a high-level signal to a grid electrode of the MOS tube, the MOS tube is conducted, and the rectifying unit is in short circuit to stop charging the filtering energy-storing capacitor.
10. The flexible direct current power transmission control board power supply circuit according to claim 5, further comprising an enabling unit, wherein the enabling unit comprises a second zener diode, an enabling capacitor and a third current limiting resistor;
the second voltage stabilizing diode is connected with the third current limiting resistor in series, the second voltage stabilizing diode is connected with the energy storage unit in parallel with the third current limiting resistor, a connecting point of the second voltage stabilizing diode and the third current limiting resistor is connected with the current energy taking power converter, and the enabling capacitor is connected with the third current limiting resistor in parallel;
when the current energy-taking power converter detects that the voltage of the enabling capacitor reaches the enabling control threshold voltage of the current energy-taking power converter, the current energy-taking power converter is started to output electric energy to the control panel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111366553.5A CN114094859A (en) | 2021-11-18 | 2021-11-18 | Power supply circuit of flexible direct-current transmission control panel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111366553.5A CN114094859A (en) | 2021-11-18 | 2021-11-18 | Power supply circuit of flexible direct-current transmission control panel |
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| CN114094859A true CN114094859A (en) | 2022-02-25 |
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