CN114447893A - High-voltage direct-current switch and method for controlling on-off of load - Google Patents
High-voltage direct-current switch and method for controlling on-off of load Download PDFInfo
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- CN114447893A CN114447893A CN202111602552.6A CN202111602552A CN114447893A CN 114447893 A CN114447893 A CN 114447893A CN 202111602552 A CN202111602552 A CN 202111602552A CN 114447893 A CN114447893 A CN 114447893A
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- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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Abstract
The invention discloses a high-voltage direct current switch and a method for controlling the on-off of a load, comprising a control chip U2; the control chip U2 controls the on-off of the IGBT drive unit, the direct-current high-voltage DCHV + is connected with one end of a LOAD, and the other end of the LOAD is connected with the output end of the IGBT drive unit; the anti-impact current circuit is connected with the control chip U2, the control chip U2 is connected with the input end of the anti-impact current circuit, the output end of the anti-impact current circuit is connected with the other end of the LOAD LOAD, and the control chip U2 controls the on-off of the anti-impact current circuit; the invention can reliably control the on-off of high-voltage direct current, miniaturize the direct-current switch and reduce the preparation difficulty.
Description
Technical Field
The invention relates to the technical field of high-voltage direct-current switches, in particular to a high-voltage direct-current switch and a method for controlling on-off of a load.
Background
The high-voltage direct-current switch is one of key equipment of a direct-current transmission system and is used for switching the operation mode and removing faults of the direct-current transmission system. The high-voltage direct-current switch in the prior art seals the switch contact in inert gas, so that the whole high-voltage direct-current switch is large in size, cannot be detected after the inert gas is leaked for a long time, and accidents are easy to cause.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above and/or other problems occurring in the prior art street lamp control.
Therefore, an object of the present invention is to provide a high voltage dc switch and a method for controlling on/off of a load thereof, which can reliably control on/off of high voltage dc, miniaturize the dc switch, and reduce the manufacturing difficulty.
In order to solve the technical problems, the invention provides the following technical scheme: a high voltage direct current switch, which comprises,
a control chip U2;
the control chip U2 controls the on-off of the IGBT drive unit, the direct-current high-voltage DCHV + is connected with one end of a LOAD, and the other end of the LOAD is connected with the output end of the IGBT drive unit;
the anti-impact current circuit, the anti-impact current circuit is connected with control chip U2, and control chip U2 is connected with the input of preventing the impact current circuit, the output and the other end of LOAD LOAD of the anti-impact current circuit are connected, control chip U2 controls the break-make of preventing the impact current circuit.
As a preferable scheme of the high voltage direct current switch of the present invention, wherein: the voltage conversion unit comprises a voltage reduction and stabilization chip U1, the 24V direct current voltage is connected with the input end Vin of the voltage reduction and stabilization chip U1, and the output end Vout of the voltage reduction and stabilization chip U1 outputs 5V direct current voltage and supplies power to the main control unit.
As a preferable scheme of the high voltage direct current switch of the present invention, wherein: the IGBT driving circuit comprises a resistor R1, a signal output end P13 of a control chip U2 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with a base electrode of a triode Q2, a collector electrode of the triode Q2 is connected with one end of a resistor R2 and a base electrode of a triode Q1, a collector electrode of the triode Q1 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with a base electrode of a triode Q3, a collector electrode of the triode Q3 is connected with a grid electrode of an IGBT Q4, a collector electrode of the IGBT Q4 is an output end of an IGBT driving unit, an emitter electrode of the triode Q2, an emitter electrode of the triode Q1 and an emitter electrode of the IGBT Q4 are all grounded, and the emitter electrode of the triode Q3 is connected with 24V direct-current voltage.
As a preferable scheme of the high voltage direct current switch of the present invention, wherein: the collector of the triode Q3 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with one end of a resistor R3 and the grid of an IGBT Q4, and the other end of the resistor R3 is grounded.
As a preferable scheme of the high voltage direct current switch of the present invention, wherein: the anti impact current circuit includes resistance R6 and resistance R7, the one end of signal output part P11 and resistance R6 of control chip U2 is connected, and the one end of signal output part P10 and resistance R7 of control chip U2 is connected, triode Q6's base is connected to resistance R6's the other end, triode Q6's collecting electrode connecting resistance R7's the other end and triode Q5's base, the control port of relay is connected to triode Q5's collecting electrode, the power input end of 24V direct current voltage connection relay, the other end of LOAD LOAD is connected to the contact K1 of relay, triode Q5's projecting pole and triode Q6's projecting pole all ground connection.
As a preferable scheme of the high voltage direct current switch of the present invention, wherein: the signal output end P31 of the control chip U2 is connected with one end of a normally open switch S2, and the other end of the switch S2 is grounded.
The method for controlling the on-off of the load by using the high-voltage direct-current switch is characterized by comprising the following steps of: the signal output end P30 of the control chip U2 is connected with one end of a normally closed switch S1, and the other end of the switch S1 is grounded.
As a preferable scheme of the method for controlling the on/off of the load by using the high-voltage direct-current switch in the invention, the method comprises the following steps: comprises the following steps of (a) carrying out,
the power-on reset is carried out, a P1 port of the initialization control chip U2 is used as an output, a P3 port is used as an input, a P13 port of the control chip U2 outputs a low potential, a P12 port outputs a low potential, the IGBT Q4 is cut off, a P11 port outputs a low potential, and the P10 port outputs a low potential, so that the contact of the relay K1 is ensured not to be attracted;
detecting the switch states of the switch S1 and the switch S2 in a circulating manner, if no switch is pressed, continuing to circulate;
if S2 is closed, checking that the existing state is on and does not act, and if the existing state is off, executing a starting time sequence after waiting for the release of the S2 switch;
if S1 is closed, checking that the existing state is closed, neglecting, if the existing state is open, after waiting for the switch S1 to release, executing a shutdown time sequence;
and returning to the step of circular detection.
As a preferable scheme of the method for controlling the on/off of the load by using the high-voltage direct-current switch in the invention, the method comprises the following steps: the boot-up sequence includes the following steps,
the switch S2 is pressed, the P11 port of the control chip U2 outputs low potential, the P10 port outputs high potential, the triode Q5 is conducted through the resistor R7, the K1 contact of the contactor is closed, the time set by delaying is delayed, the P13 port of the control chip U2 outputs low potential, and the P12 port outputs high potential.
As a preferable scheme of the method for controlling the on/off of the load by using the high-voltage direct-current switch in the invention, the method comprises the following steps: the shutdown sequence includes the following steps,
and when the switch S1 is pressed, the P10 port of the control chip U2 outputs low voltage, the K1 contact of the relay is disconnected after power failure, and after the set time is reached, the P12 port of the control chip U2 outputs low potential, the triode Q1, the triode Q2, the triode Q3 and the IGBT Q4 are all cut off, so that the process of disconnecting the load from the high-voltage loop is completed.
The invention has the beneficial effects that: the invention reliably controls the on-off of high-voltage direct current through the combination of the IGBT and the low-voltage mechanical relay and a reasonable time sequence relation, so that the direct current switch is miniaturized, and the preparation difficulty is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a circuit configuration diagram of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures of the present invention are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1, a first embodiment of the present invention provides a high voltage direct current switch and a method for controlling on/off of a load thereof, which can control a dimming circuit to operate and adjust light brightness according to obtained power information, control a lamp switch through a relay control circuit, and obtain position information of the lamp in real time through a communication positioning module by a cloud platform, so as to control the lamp without being limited by distance.
A high voltage direct current switch and a method for controlling the on-off of a load thereof comprise a control chip U2;
the control chip U2 controls the on-off of the IGBT driving unit, the direct-current high-voltage DCHV + is connected with one end of a LOAD, and the other end of the LOAD is connected with the output end of the IGBT driving unit;
the anti-impact current circuit, the anti-impact current circuit is connected with control chip U2, and control chip U2 is connected with the input of preventing the impact current circuit, the output and the other end of LOAD LOAD of the anti-impact current circuit are connected, control chip U2 controls the break-make of preventing the impact current circuit.
Further, the voltage conversion unit comprises a voltage reduction and stabilization chip U1, the 24V direct current voltage is connected with the input end Vin of the voltage reduction and stabilization chip U1, and the output end Vout of the voltage reduction and stabilization chip U1 outputs 5V direct current voltage and supplies power to the main control unit.
Further, the IGBT driving circuit includes a resistor R1, the signal output terminal P13 of the control chip U2 is connected to one end of a resistor R1, the other end of the resistor R1 is connected to the base of a transistor Q2, the collector of the transistor Q2 is connected to one end of a resistor R2 and the base of a transistor Q1, the collector of the transistor Q1 is connected to one end of a resistor R3, the other end of the resistor R3 is connected to the base of a transistor Q3, the collector of the transistor Q3 is connected to the gate of the IGBT Q4, the collector of the IGBT Q4 is connected to the output terminal of the IGBT driving unit, the emitter of the transistor Q2, the emitter of the transistor Q1 and the emitter of the IGBT Q4 are all grounded, the emitter of the transistor Q3 is connected to a 24V dc voltage, the collector of the transistor Q3 is connected to one end of a resistor R4, the other end of the resistor R4 is connected to one end of the resistor R3 and the gate of the IGBT Q4, the other end of the resistor R3 is grounded.
Further, the anti-impact current circuit comprises a resistor R6 and a resistor R7, a signal output end P11 of a control chip U2 is connected with one end of a resistor R6, a signal output end P10 of a control chip U2 is connected with one end of a resistor R7, the other end of the resistor R6 is connected with a base electrode of a triode Q6, the other end of a resistor R7 and a base electrode of a triode Q5 are connected with a collector electrode of the triode Q6, a control port of a relay is connected with a collector electrode of the triode Q5, a power supply input end of the relay is connected with 24V direct-current voltage, a contact K1 of the relay is connected with the other end of a LOAD LOAD, and an emitter electrode of the triode Q5 and an emitter electrode of the triode Q6 are both grounded.
Further, a signal output end P31 of the control chip U2 is connected with one end of a normally open switch S2, and the other end of the switch S2 is grounded; the signal output end P30 of the control chip U2 is connected with one end of a normally closed switch S1, and the other end of the switch S1 is grounded.
When the triode Q1 is turned on, the Q3 is turned on, the base of the Q3 outputs 24V, the voltage is divided by the resistors R3 and R4, the gate of the IGBT Q4 is about 13V, the IGBT Q4 is turned on, DCHV + (direct current high voltage) sequentially passes through the LOAD, the gate of the IGBT Q4, the emitter of the IGBT Q4 is connected to the DCHV-, the direct current low voltage relay contact is connected in parallel to the emitter of the IGBT Q4, the control chip U2 needs tens of milliseconds to start, the potentials at the P12 port and the P13 port of the control chip U2 are in a free state in the period of time, the P12 port and the P13 have the same circuit structure, and the high level or the low level can be simultaneously output, the Q1 and the Q2 form an interlock circuit, and when the transistor Q2 is turned on as the high level, the Q1 is turned off, the Q3 is turned off, and the IGBT 4 is turned off; if the voltage is low level, Q2 is cut off, Q1 is cut off, Q3 is cut off, IGBT Q4 is cut off, an interlocking circuit avoids error driving of IGBT Q4, DCHV has no impact current when starting up is guaranteed, the triode Q6 and Q5 form the interlocking circuit, and the K1 is guaranteed not to be attracted in the power-on reset stage.
Example 2
Referring to fig. 1, a second embodiment of the present invention is different from embodiment 1 in that it can implement interaction between external information and a main control module.
A method for controlling the on-off of a load by a high-voltage direct-current switch comprises the following steps,
the power-on reset is carried out, a P1 port of the initialization control chip U2 is used as an output, a P3 port is used as an input, a P13 port of the control chip U2 outputs a low potential, a P12 port outputs a low potential, the IGBT Q4 is cut off, a P11 port outputs a low potential, and the P10 port outputs a low potential, so that the contact of the relay K1 is ensured not to be attracted;
detecting the switch states of the switch S1 and the switch S2 in a circulating manner, if no switch is pressed, continuing to circulate;
if S2 is closed, checking that the existing state is on and does not act, and if the existing state is off, executing a starting time sequence after waiting for the release of the S2 switch;
if S1 is closed, checking that the existing state is closed, neglecting, if the existing state is open, after waiting for the switch S1 to release, executing a shutdown time sequence;
and returning to the step of circular detection.
Further, the power-on sequence includes the following steps,
pressing a switch S2, controlling a P11 port of a chip U2 to output a low potential, controlling a P10 port to output a high potential, conducting a triode Q5 through a resistor R7, attracting a K1 contact of a contactor, forming a loop from a LOAD LOAD and a K1 to the DCHV through the DCHV +, if the circuit is used for PTC heating, the impact current of the PTC heating core is usually 3 times of the normal working current and can be discharged through the loop, delaying the set time (the delayed time is determined by the duration of the impact current of the heating core), controlling the P13 port of the chip U2 to output the low potential, the P12 port to output the high potential, conducting a triode Q1, conducting a triode Q3 and conducting an IGBT Q4, and sequentially carrying the LOAD current to DCHV-through a grid of the DCHV +, a LOAD LOAD, a grid of the IGBT Q4 and an emitter of the IGBT Q4 to bear the LOAD current together with a relay;
the shutdown sequence includes the following steps,
the switch S1 is pressed, the P10 port of the control chip U2 outputs low voltage, the triode Q5 is cut off, the K1 contact of the mechanical relay is disconnected in a power-off mode, the IGBT A4 is still conducted and is connected to the K1 contact in parallel, arc discharge cannot be formed when the K1 is disconnected, after 40 milliseconds, the K1 contact is shaken completely and stops, the P12 port of the control chip U2 outputs low potential, the triode Q1, the triode Q2, the triode Q3 and the IGBT Q4 are all cut off, and the process that the load is disconnected from a high-voltage loop is completed.
Through the combined arrangement of the control chip, the IGBT driving circuit and the anti-impact current circuit and the design of the time sequence relation, the direct-current high voltage can reliably switch on and off the load, the structure is simple, the high-voltage direct-current switch is miniaturized, the preparation process is simple, and the direct-current high-voltage direct-current switch is easy to see even if a fault occurs.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A high voltage direct current switch and a method for controlling the on-off of a load are characterized in that: which comprises the steps of preparing a mixture of a plurality of raw materials,
a control chip U2;
the control chip U2 controls the on-off of the IGBT driving unit, the direct-current high-voltage DCHV + is connected with one end of a LOAD, and the other end of the LOAD is connected with the output end of the IGBT driving unit;
the anti-impact current circuit, the anti-impact current circuit is connected with control chip U2, and control chip U2 is connected with the input of preventing the impact current circuit, the output and the other end of LOAD LOAD of the anti-impact current circuit are connected, control chip U2 controls the break-make of preventing the impact current circuit.
2. The high voltage direct current switch of claim 1, characterized in that: the voltage conversion unit comprises a voltage reduction and stabilization chip U1, the 24V direct current voltage is connected with the input end Vin of the voltage reduction and stabilization chip U1, and the output end Vout of the voltage reduction and stabilization chip U1 outputs 5V direct current voltage and supplies power to the main control unit.
3. The high voltage direct current switch according to claim 1 or 2, characterized in that: the IGBT driving circuit comprises a resistor R1, a signal output end P13 of a control chip U2 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with a base electrode of a triode Q2, a collector electrode of the triode Q2 is connected with one end of a resistor R2 and a base electrode of a triode Q1, a collector electrode of the triode Q1 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with a base electrode of a triode Q3, a collector electrode of the triode Q3 is connected with a grid electrode of an IGBT Q4, a collector electrode of the IGBT Q4 is an output end of an IGBT driving unit, an emitter electrode of the triode Q2, an emitter electrode of the triode Q1 and an emitter electrode of the IGBT Q4 are all grounded, and the emitter electrode of the triode Q3 is connected with 24V direct-current voltage.
4. The high voltage direct current switch of claim 3, characterized in that: the collector of the triode Q3 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with one end of a resistor R3 and the grid of the IGBT Q4, and the other end of the resistor R3 is grounded.
5. The high voltage direct current switch of claim 3, characterized in that: the anti impact current circuit includes resistance R6 and resistance R7, control chip U2's signal output part P11 and resistance R6's one end are connected, and control chip U2's signal output part P10 and resistance R7's one end are connected, triode Q6's base is connected to resistance R6's the other end, triode Q6's collecting electrode connecting resistance R7's the other end and triode Q5's base, the control port of relay is connected to triode Q5's collecting electrode, the power input end of 24V direct current voltage connection relay, the other end of LOAD LOAD is connected to the contact K1 of relay, triode Q5's projecting pole and triode Q6's projecting pole all ground connection.
6. The high voltage direct current switch of claim 5, characterized in that: the signal output end P31 of the control chip U2 is connected with one end of a normally open switch S2, and the other end of the switch S2 is grounded.
7. The high voltage direct current switch of claim 6, characterized in that: the signal output end P30 of the control chip U2 is connected with one end of a normally closed switch S1, and the other end of the switch S1 is grounded.
8. The method for controlling the on-off of the load by using the high-voltage direct current switch as claimed in any one of claims 1 to 7 is characterized in that: comprises the following steps of (a) carrying out,
the power-on reset is carried out, a P1 port of the initialization control chip U2 is used as an output, a P3 port is used as an input, a P13 port of the control chip U2 outputs a low potential, a P12 port outputs a low potential, the IGBT Q4 is cut off, a P11 port outputs a low potential, and the P10 port outputs a low potential, so that the contact of the relay K1 is ensured not to be attracted;
detecting the switch states of the switch S1 and the switch S2 in a circulating manner, if no switch is pressed, continuing to circulate;
if S2 is closed, checking that the existing state is on and does not act, if the existing state is off, and executing a starting time sequence after waiting for the release of the S2 switch;
if S1 is closed, checking that the existing state is closed, neglecting, if the existing state is open, after waiting for the switch S1 to release, executing a shutdown time sequence;
and returning to the step of circular detection.
9. The method of claim 8, wherein the method further comprises: the boot-up sequence includes the following steps,
the switch S2 is pressed, the P11 port of the control chip U2 outputs low potential, the P10 port outputs high potential, the triode Q5 is conducted through the resistor R7, the K1 contact of the contactor is closed, the time set by delaying is delayed, the P13 port of the control chip U2 outputs low potential, and the P12 port outputs high potential.
10. A method of switching a load according to claim 9, wherein: the shutdown sequence includes the following steps,
and when the switch S1 is pressed, the P10 port of the control chip U2 outputs low voltage, the K1 contact of the relay is disconnected after power failure, and after the set time is reached, the P12 port of the control chip U2 outputs low potential, the triode Q1, the triode Q2, the triode Q3 and the IGBT Q4 are all cut off, so that the process of disconnecting the load from the high-voltage loop is completed.
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| CN202111602552.6A CN114447893B (en) | 2021-12-24 | 2021-12-24 | High-voltage direct-current switch and method for controlling on-off of load by same |
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| KR20090127987A (en) * | 2008-06-10 | 2009-12-15 | 주식회사 네이스코 | A circuit to be protected from the over-current which is used in the flasher unit for a vehicle |
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2021
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| SU1376168A1 (en) * | 1986-01-13 | 1988-02-23 | Предприятие П/Я П-6292 | Device for checking load state and connecting same to d.c. power source |
| KR19980064869U (en) * | 1997-04-30 | 1998-11-25 | 배순훈 | B + Overcurrent Protection Circuit in Monitors |
| JPH1141908A (en) * | 1997-07-18 | 1999-02-12 | Nec Corp | Power supply equipment |
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