CN112993995B - Bypass device - Google Patents
Bypass device Download PDFInfo
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- CN112993995B CN112993995B CN202110355079.XA CN202110355079A CN112993995B CN 112993995 B CN112993995 B CN 112993995B CN 202110355079 A CN202110355079 A CN 202110355079A CN 112993995 B CN112993995 B CN 112993995B
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- 239000007787 solid Substances 0.000 claims abstract description 21
- 230000002159 abnormal effect Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000015556 catabolic process Effects 0.000 claims description 15
- 238000010586 diagram Methods 0.000 description 9
- 238000007796 conventional method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000010355 oscillation Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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Abstract
The invention relates to a bypass device comprising a solid state bypass switch, further comprising: the active driving circuit is used for electrically connecting the main control device and the solid bypass switch and is used for driving the solid bypass switch to be conducted when receiving an enabling signal sent by the main control device; the main control device is used for outputting an enabling signal when detecting that the voltage quality of the overhead line system is abnormal; and the passive driving circuit is electrically connected with the solid-state bypass switch and is used for driving the solid-state bypass switch to be conducted when the voltage at two ends of the solid-state bypass switch is detected to exceed the preset threshold value. The invention utilizes the active driving circuit to acquire the enabling signal sent by the main control device, and when the enabling signal is received, the active driving circuit drives the solid bypass switch to be conducted; meanwhile, the voltage at two ends of the solid-state bypass switch is detected by the passive driving circuit, when the active driving circuit fails, the passive driving circuit detects that the voltage exceeds a preset threshold value, and at the moment, the solid-state bypass switch is driven to be conducted by the passive driving circuit, so that the operation reliability of the bypass device is improved.
Description
Technical Field
The invention relates to the technical field of railway traction purification power supplies, in particular to a bypass device.
Background
The railway traction purifying power supply is used for being installed under a railway traction transformer, taking electricity from the secondary side of the traction transformer, carrying out voltage regulation, filtering and other purifying treatments on the voltage, eliminating the inherent power quality problems of voltage drop, sudden rise, sudden fall, overvoltage, undervoltage, voltage fluctuation, three-phase voltage unbalance, voltage harmonic and the like of a contact network power grid, and obtaining stable three-phase voltage for a power supply device used for a through line. The purifying power supply is connected in series between the contact net power grid and the protected load to compensate and control the voltage of the load side.
The purifying power supply mainly comprises an online compensation running state and an online bypass running state in application, wherein when the voltage of the overhead contact system has a quality problem, the purifying power supply is in the online compensation running state so as to ensure that the power distribution network system has higher voltage quality level; when the voltage of the contact net returns to normal, the purifying power supply is in an on-line bypass operation state so as to ensure the overall operation efficiency of the system.
In the process of converting the two states of the purifying power supply, if the operation reliability of the bypass switch is not high enough, the contact network voltage system cannot meet uninterrupted power supply.
Disclosure of Invention
In view of the above, it is necessary to provide a bypass device with high reliability.
A bypass device comprising a solid state bypass switch, further comprising:
The active driving circuit is used for electrically connecting the main control device and the solid-state bypass switch and is used for driving the solid-state bypass switch to be conducted when receiving an enabling signal sent by the main control device; the main control device is used for outputting the enabling signal when detecting that the voltage quality of the overhead line system is abnormal;
And the passive driving circuit is electrically connected with the solid-state bypass switch and is used for driving the solid-state bypass switch to be conducted when the voltage at the two ends of the solid-state bypass switch is detected to exceed a preset threshold value.
In one embodiment, the active driving circuit includes:
The control circuit is used for being electrically connected with the main control device and outputting a first driving signal when receiving the enabling signal;
The forward driving circuit is electrically connected with the control circuit and the solid-state bypass switch and is used for outputting an active driving signal to the solid-state bypass switch when receiving the first driving signal; the active driving signal is used for driving the solid-state bypass switch to be conducted;
and the flyback power supply circuit is used for supplying power to the forward driving circuit and the control circuit.
In one embodiment, the control circuit includes a signal receiving unit and a first driving unit;
The input end of the signal receiving unit is electrically connected with the main control device and is used for receiving the enabling signal sent by the main control device; the output end is electrically connected with the first driving unit and is used for outputting a trigger signal to the first driving unit when receiving the enabling signal;
The first driving unit is electrically connected with the forward driving circuit and is used for outputting a first driving signal to the forward driving circuit when the trigger signal is received.
In one embodiment, the forward driving circuit includes a first forward unit and a forward control unit;
The forward control unit is electrically connected with the first driving unit and is used for outputting a first control signal to the first forward unit when receiving the first driving signal;
The first forward unit is used for outputting an active driving signal when receiving the first control signal.
In one embodiment, the forward driving circuit further includes a second forward unit;
The forward control unit is also used for outputting a first control signal to the second forward unit;
the second forward unit is used for outputting an active driving signal when receiving the first control signal.
In one embodiment, the forward control unit includes a peak current clamp module.
In one embodiment, the first driving unit includes: NPN triode Q1, NPN triode Q2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, diode D1, diode D2, diode D3 and capacitor C1;
the first end of the resistor R1 is electrically connected with the output end of the signal receiving unit, and the second end of the resistor R1 is electrically connected with the anode of the diode D1;
the cathode of the diode D1 is electrically connected with the base electrode of the NPN triode Q1;
The collector electrode of the NPN triode Q1 is electrically connected with the first end of the resistor R2, and the emitter electrode is grounded;
the second end of the resistor R2 is electrically connected with the voltage output end of the flyback power supply circuit;
The first end of the resistor R3 is electrically connected with the first end of the resistor R2, and the second end of the resistor R3 is electrically connected with the first end of the resistor R4;
The second end of the resistor R4 is electrically connected with the anode of the diode D2;
the cathode of the diode D2 is electrically connected with the base electrode of the NPN triode Q2;
the collector electrode of the NPN triode Q2 is electrically connected with the first end of the resistor R5, and the emitter electrode is grounded;
the second end of the resistor R5 is used for being electrically connected with the reference power supply output end of the peak current clamping module;
The anode of the diode D3 is electrically connected with the first end of the resistor R5, and the cathode is electrically connected with the current feedback end of the peak current clamping module;
the first end of the resistor R6 is electrically connected with the collector electrode of the NPN triode, and the second end of the resistor R6 is electrically connected with the cathode electrode of the diode D3;
the first end of the capacitor C1 is electrically connected with the second end of the resistor R6 and the first driving signal receiving end of the forward control unit, and the second end is grounded.
In one embodiment, the peak current clamping module includes a pulse width modulation chip U1, a resistor R7, a resistor R8, an NPN triode Q3, a PNP triode Q4, an NPN triode Q5, and a PNP triode Q6;
The power input end of the pulse width modulation chip U1 is electrically connected with the power output end of the flyback power supply circuit, the reverse pulse output end is electrically connected with the power input end, the first in-phase input end is electrically connected with the second in-phase input end, the first reverse input end is electrically connected with the second reverse input end and the reference power output end, and the pulse signal reference ground end is electrically connected with the first end of the resistor R7 and the first end of the resistor R8;
the second end of the resistor R7 is electrically connected with the base electrode of the PNP triode Q4;
The collector of the PNP triode Q4 is grounded, and the emitter is electrically connected with the emitter of the NPN triode Q3;
the base electrode of the NPN triode Q3 is electrically connected with the second end of the resistor R7, the collector electrode is electrically connected with the power output end of the flyback power supply circuit, and the emitter electrode is electrically connected with the controlled end of the first forward unit;
the second end of the resistor R8 is electrically connected with the base electrode of the PNP triode Q6;
the collector of the PNP triode Q6 is grounded, and the emitter is electrically connected with the emitter of the NPN triode Q5;
And the base electrode of the NPN triode Q5 is electrically connected with the second end of the resistor R8, the collector electrode is electrically connected with the power output end of the flyback power supply circuit, and the emitter electrode is electrically connected with the controlled end of the second forward unit.
In one embodiment, the flyback power supply is a closed-loop control flyback circuit.
In one embodiment, the passive driving circuit includes:
the overvoltage protection circuit is used for outputting an overvoltage driving signal when the voltage at two ends of the solid-state bypass switch exceeds a preset threshold value;
the second driving circuit is used for receiving the overvoltage driving signal and latching, and outputting a passive driving signal to the solid-state bypass switch according to the overvoltage driving signal; the passive drive signal is used to indicate that the solid state bypass switch is on.
In one embodiment, the overvoltage protection circuit includes: resistor R9, resistor R10, diode D4, breakdown diode BOD, and capacitor C2;
the first end of the resistor R9 is electrically connected with the input end of the solid-state bypass switch, and the second end of the resistor R9 is electrically connected with the anode of the diode D4;
The cathode of the diode D4 is electrically connected with the anode of the breakdown diode BOD;
The cathode of the breakdown diode BOD is electrically connected with the first end of the resistor R10 and the input end of the second driving circuit;
The second end of the resistor R10 is electrically connected with the output end of the solid-state bypass switch;
The first end of the capacitor C2 is electrically connected to the first end of the resistor R10, and the second end is electrically connected to the second end of the resistor R10.
In one embodiment, the second driving circuit includes: RS latch, or gate, and drive gate;
The first signal input end of the RS latch is used as the input end of the second driving circuit and is electrically connected with the cathode of the breakdown diode BOD and the first input end of the OR gate; the second signal input end of the RS latch is grounded, and the first output end of the RS latch is electrically connected with the second input end of the OR gate;
the output end of the OR gate is electrically connected with the input end of the driving gate;
the output end of the driving gate is electrically connected with the controlled end of the solid-state bypass switch.
In one embodiment, a mechanical bypass switch is also included,
The control end of the mechanical bypass switch is connected with an input switch of the system low-voltage power cabinet in series;
the input switch of the system low-voltage power cabinet is connected in parallel with the control switch of the main control device.
The bypass device is provided with an active driving circuit and a passive driving circuit for the solid bypass switch, the active driving circuit is used for acquiring an enabling signal sent by the main control device, and when receiving the enabling signal, the active driving circuit drives the solid bypass switch to be conducted; meanwhile, the passive driving circuit is used for detecting the voltage at two ends of the solid-state bypass switch, when the active driving circuit fails, the passive driving circuit detects that the voltage exceeds a preset threshold value, and at the moment, the solid-state bypass switch is driven to be conducted by the passive driving circuit, so that the operation reliability of the bypass device is improved, and uninterrupted power supply of a voltage system is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is one of the block diagrams of the bypass device in one embodiment;
FIG. 2 is a second block diagram of a bypass device according to an embodiment;
FIG. 3 is a block diagram of a control circuit according to an embodiment;
FIG. 4 is a block diagram showing a structure of a forward driving circuit according to an embodiment;
FIG. 5 is a block diagram of a forward driving circuit according to another embodiment;
FIG. 6 is a schematic circuit diagram of a first driving unit according to an embodiment;
FIG. 7 is a schematic diagram of a circuit structure of a peak current clamp module according to an embodiment;
FIG. 8 is a schematic diagram of a passive driving circuit according to an embodiment;
FIG. 9 is a third block diagram of a bypass device in one embodiment.
Detailed Description
The present invention will be described more fully hereinafter in order to facilitate an understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to and integrated with the other element or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In one embodiment, as shown in fig. 1, there is provided a bypass device comprising a solid state bypass switch, further comprising:
the active driving circuit is used for electrically connecting the main control device and the solid bypass switch and is used for driving the solid bypass switch to be conducted when receiving an enabling signal sent by the main control device; the main control device is used for outputting an enabling signal when detecting that the voltage quality of the overhead line system is abnormal;
and the passive driving circuit is electrically connected with the solid-state bypass switch and is used for driving the solid-state bypass switch to be conducted when the voltage at two ends of the solid-state bypass switch is detected to exceed the preset threshold value.
The main control device can detect the voltage quality condition of the overhead contact system, and when the overhead contact system is normal in voltage, a solid bypass switch is not required to be put into; when the voltage of the contact net is abnormal, the main control device outputs an enabling signal to the active driving circuit to instruct the active driving circuit to drive the solid bypass switch to be conducted. The active driving circuit is used for driving the solid-state bypass switch according to the enabling signal of the main control device, but the active driving circuit needs to rely on the signal indication of the main control device, and the abnormal signal transmission of the main control device can happen. By setting the passive driving circuit as standby driving, the voltage at two ends of the solid-state bypass switch is directly detected, and when the voltage exceeds a preset threshold value, the solid-state bypass switch is directly driven to be conducted by the passive driving circuit.
The bypass device is provided with an active driving circuit and a passive driving circuit for the solid bypass switch, the active driving circuit is used for acquiring an enabling signal sent by the main control device, and when receiving the enabling signal, the active driving circuit drives the solid bypass switch to be conducted; meanwhile, the passive driving circuit is used for detecting the voltage at two ends of the solid-state bypass switch, when the active driving circuit fails, the passive driving circuit detects that the voltage exceeds a preset threshold value, and at the moment, the solid-state bypass switch is driven to be conducted by the passive driving circuit, so that the operation reliability of the bypass device is improved, and uninterrupted power supply of a voltage system is ensured.
As shown in fig. 2, in one embodiment, the active driving circuit includes:
the control circuit is used for being electrically connected with the main control device and outputting a first driving signal when receiving an enabling signal;
The forward driving circuit is electrically connected with the control circuit and the solid-state bypass switch and is used for outputting an active driving signal to the solid-state bypass switch when receiving the first driving signal; the active driving signal is used for driving the solid-state bypass switch to be conducted;
And the flyback power supply circuit is used for supplying power to the forward drive circuit and the control circuit.
The control circuit is used for enabling when receiving an enabling signal output by the main control device, outputting a first driving signal to the forward driving circuit, and the first driving signal is used for driving the forward driving circuit to output an active driving signal. When the forward driving circuit receives the first driving signal, the forward driving circuit outputs an active driving signal to the controlled end of the solid-state bypass switch to drive the solid-state bypass switch to be conducted. The forward driving circuit has the advantages of simple circuit topology structure, input and output electrical isolation, wide voltage rising and falling range and easiness in multiplexing output, and is used for driving the solid-state bypass switch and can improve reliability and safety.
The flyback power supply circuit is used for continuously supplying power to the forward driving circuit and the control circuit, so that the control circuit and the forward driving circuit can reliably work when the main control device outputs an enabling signal. The flyback power supply circuit has the advantages of simpler circuit, fewer elements, smaller volume and lower cost compared with a forward switching power supply. In addition, the output voltage of the flyback power supply circuit is subjected to the modulation amplitude of the duty ratio, which is much higher than that of the forward power supply, so that the flyback power supply circuit is required to regulate the error signal amplitude of the duty ratio to be lower, the gain and the dynamic range of the error signal amplifier are also smaller, multiplexing output and multi-voltage output can be simply realized, and different power supply voltages can be output according to the requirements of the control circuit and the forward driving circuit.
As shown in fig. 3, in one embodiment, the control circuit includes a signal receiving unit and a first driving unit;
The input end of the signal receiving unit is electrically connected with the main control device and is used for receiving an enabling signal sent by the main control device; the output end is electrically connected with the first driving unit and is used for outputting a trigger signal to the first driving unit when receiving an enabling signal;
the first driving unit is electrically connected with the forward driving circuit and is used for outputting a first driving signal to the forward driving circuit when receiving the trigger signal.
The signal receiving unit can be electrically connected with the main control device in a wired connection and wireless connection mode so as to receive the enabling signal sent by the main control device. According to the different signal output modes of the main control device, the signal receiving unit receives signals by adopting corresponding elements. In one embodiment, the master device sends the enabling signal through the optical fiber transmitter, and the signal receiving unit includes an optical fiber receiver for receiving the enabling signal sent by the master device. When receiving the enabling signal, the signal receiving unit outputs a trigger signal to the first driving unit to trigger the first driving unit to output a first driving signal. In one embodiment, the master device may also send the enabling signal to the signal receiving unit through wireless communication such as bluetooth, wifi or cellular data.
As shown in fig. 4, in one embodiment, the forward driving circuit includes a first forward unit and a forward control unit;
the forward control unit is electrically connected with the first driving unit and is used for outputting a first control signal to the first forward unit when receiving the first driving signal;
The first forward unit is used for outputting an active driving signal when receiving a first control signal.
The forward control unit is used for carrying out drive control on the first forward unit according to the first drive signal, and when the first drive signal is received, the forward control unit outputs the first control signal to drive the first forward unit to output an active drive signal to the solid-state bypass switch.
In one embodiment, in order to ensure that the solid-state bypass switch can reliably operate, the first forward unit is provided with multiple paths of parallel driving outputs, and each path of driving output is electrically connected with a controlled end of the solid-state bypass switch, so that the problem that the solid-state bypass switch cannot be normally driven due to a single path of driving output fault is avoided.
As shown in fig. 5, in one embodiment, the forward driving circuit further includes a second forward unit;
The forward control unit is also used for outputting a first control signal to the second forward unit;
the second forward unit is used for outputting an active driving signal when receiving the first control signal.
In order to further improve the driving reliability, the second forward unit and the first forward unit are arranged for mutual standby, when the forward control unit outputs a first control signal, the first forward unit and the second forward unit simultaneously output an active driving signal to the solid-state bypass switch, and if the first forward unit fails, the second forward unit can normally drive the solid-state bypass switch to be conducted.
In one embodiment, the forward control unit includes a peak current clamp module.
As shown in fig. 6, in one of the embodiments, the first driving unit includes: NPN triode Q1, NPN triode Q2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, diode D1, diode D2, diode D3 and capacitor C1;
The first end of the resistor R1 is electrically connected with the output end of the signal receiving unit, and the second end of the resistor R1 is electrically connected with the anode of the diode D1;
the cathode of the diode D1 is electrically connected with the base electrode of the NPN triode Q1;
the collector electrode of the NPN triode Q1 is electrically connected with the first end of the resistor R2, and the emitter electrode is grounded;
The second end of the resistor R2 is electrically connected with the voltage output end of the flyback power supply circuit;
The first end of the resistor R3 is electrically connected with the first end of the resistor R2, and the second end of the resistor R4;
The second end of the resistor R4 is electrically connected with the anode of the diode D2;
the cathode of the diode D2 is electrically connected with the base electrode of the NPN triode Q2;
The collector electrode of the NPN triode Q2 is electrically connected with the first end of the resistor R5, and the emitter electrode is grounded;
the second end of the resistor R5 is used for being electrically connected with the reference power supply output end of the peak current clamping module;
The anode of the diode D3 is electrically connected with the first end of the resistor R5, and the cathode is electrically connected with the current feedback end of the peak current clamping module;
The first end of the resistor R6 is electrically connected with the collector electrode of the NPN triode, and the second end of the resistor R6 is electrically connected with the cathode of the diode D3;
the first end of the capacitor C1 is electrically connected with the second end of the resistor R6 and the first driving signal receiving end of the forward control unit, and the second end is grounded.
When the signal receiving unit receives an enabling signal, a high level is output to the base electrode of the NPN triode Q1 through the resistor R1 and the diode D1 to serve as a trigger signal, the NPN triode Q1 is conducted, the base electrode level of the NPN triode Q2 is pulled down, the NPN triode Q2 is cut off, the capacitor C1 discharges to the resistor R6, the first end of the capacitor C1 serves as a first driving signal output end to be electrically connected with the current feedback end of the peak current clamping module, after electric energy stored by the capacitor C1 is exhausted, the resistor R6 has no current, at the moment, the current feedback end of the peak current clamping module detects no current, namely the first driving signal is received, and therefore soft start is achieved, current received by the forward control unit during start can be effectively limited, and damage to the forward control unit caused by overcurrent is avoided. The diode D1 and the diode D2 are used to prevent the voltage from reversing. The resistor R2 is a pull-up resistor, and is used for pulling up the collector voltage of the NPN triode Q1, and simultaneously, when the NPN triode Q1 is turned off, the resistor R2 is also used for pulling up the base voltage of the NPN triode Q2. The resistor R3 is used for dividing voltage with the resistor R2 to provide proper voltage for the collector of the NPN triode Q1 and the base of the NPN triode Q2. The resistor R5 is used for raising the collector voltage of the NPN triode Q2, and meanwhile, current limiting is realized, and when the NPN triode Q2 is conducted, the reference power supply output end of the peak current clamping module charges the capacitor C1 through the resistor R6. The diode D3 is used to prevent the capacitor C1 from discharging back into the reference power supply output of the peak current clamp module.
As shown in fig. 7, in one embodiment, the peak current clamping module includes a pulse width modulation chip U1, a resistor R7, a resistor R8, an NPN triode Q3, a PNP triode Q4, an NPN triode Q5, and a PNP triode Q6;
the power input end of the pulse width modulation chip U1 is electrically connected with the power output end of the flyback power supply circuit, the reverse pulse output end is electrically connected with the power input end, the first in-phase input end is electrically connected with the second in-phase input end, the first reverse input end is electrically connected with the second reverse input end and the reference power output end, and the pulse signal reference ground end is electrically connected with the first end of the resistor R7 and the first end of the resistor R8;
the second end of the resistor R7 is electrically connected with the base electrode of the PNP triode Q4;
The collector of the PNP triode Q4 is grounded, and the emitter is electrically connected with the emitter of the NPN triode Q3;
the base electrode of the NPN triode Q3 is electrically connected with the second end of the resistor R7, the collector electrode is electrically connected with the power output end of the flyback power supply circuit, and the emitter electrode is electrically connected with the controlled end of the first forward unit;
the second end of the resistor R8 is electrically connected with the base electrode of the PNP triode Q6;
The collector of the PNP triode Q6 is grounded, and the emitter is electrically connected with the emitter of the NPN triode Q5;
The base electrode of NPN triode Q5 is electrically connected with the second end of resistor R8, the collector electrode is electrically connected with the power output end of flyback power supply circuit, and the emitter electrode is electrically connected with the controlled end of the second forward unit.
The reference power supply output end of the pulse width modulation chip U1 is the reference power supply output end of the peak current clamping module, and the current feedback end is the current feedback end of the peak current clamping module. The current feedback end of the pulse width modulation chip U1 is started when the current of the resistor R6 is detected to be 0, PWM signals are output through the pulse signal reference ground end, when the PWM signals are effective, the base level of the NPN triode Q3, the base level of the PNP triode Q4, the base level of the NPN triode Q5 and the base level of the PNP triode Q6 are pulled down, the PNP triode Q4 and the PNP triode Q6 are conducted, the NPN triode Q3 and the NPN triode Q5 are cut off, PWM control signals are output to the controlled end of the first forward unit and the controlled end of the second forward unit respectively, active driving signals are output to the first forward unit and the second forward unit, and the solid-state bypass switch is driven to conduct. The resistor R7 is a current limiting resistor for limiting the current flowing into the base of the PNP triode Q4 and the base of the NPN triode Q3. Resistor R8 is also a current limiting resistor for limiting the current flowing into the base of PNP transistor Q6 and the base of NPN transistor Q5.
In one embodiment, the flyback power supply is a closed-loop control flyback circuit.
In order to ensure stable output voltage and prevent oscillation in the process of supplying power to the control circuit and the forward drive circuit, the flyback power supply circuit adopts a closed-loop control flyback circuit as the flyback power supply circuit.
In one embodiment, the passive driving circuit includes:
the overvoltage protection circuit is used for outputting an overvoltage driving signal when the voltage at two ends of the solid-state bypass switch exceeds a preset threshold value;
the second driving circuit is used for receiving and latching the overvoltage driving signal and outputting a passive driving signal to the solid-state bypass switch according to the overvoltage driving signal; the passive drive signal is used to indicate that the solid state bypass switch is on.
When the voltage at two ends of the solid bypass switch exceeds a preset threshold, the solid bypass switch needs to be driven to be conducted, the overvoltage protection circuit is utilized to detect the voltage at two ends of the solid bypass switch, and when the voltage exceeds the preset threshold, an overvoltage driving signal is output. The second driving circuit is used for receiving the overvoltage driving signal and outputting a passive driving signal according to the overvoltage driving signal, and in order to ensure that the solid-state bypass switch is kept on, the second driving circuit is latched when receiving the overvoltage driving signal.
As shown in fig. 8, in one embodiment, the overvoltage protection circuit includes: resistor R9, resistor R10, diode D4, breakdown diode BOD, and capacitor C2;
The first end of the resistor R9 is electrically connected with the input end of the solid-state bypass switch, and the second end of the resistor R9 is electrically connected with the anode of the diode D4;
the cathode of the diode D4 is electrically connected with the anode of the breakdown diode BOD;
the cathode of the breakdown diode BOD is electrically connected with the first end of the resistor R10 and the input end of the second driving circuit;
the second end of the resistor R10 is electrically connected with the output end of the solid-state bypass switch;
the first end of the capacitor C2 is electrically connected to the first end of the resistor R10, and the second end is electrically connected to the second end of the resistor R10.
The voltage flows to the input end of the second driving circuit through the resistor R9, the diode D4 and the breakdown diode BOD, the output end of the second driving circuit is electrically connected with the controlled end of the solid-state bypass switch, and when the voltage output to the controlled end of the solid-state bypass switch reaches the working voltage, the voltage at the two ends of the solid-state bypass switch reaches the preset threshold value. Resistor R10 and capacitor C2 are used for filtering.
As shown in fig. 8, in one embodiment, the second driving circuit includes: RS latch, or gate, and drive gate;
The first signal input end of the RS latch is used as the input end of the second driving circuit and is electrically connected with the cathode of the breakdown diode BOD and the first input end of the OR gate; the second signal input end of the RS latch is grounded, and the first output end is electrically connected with the second input end of the OR gate;
the output end of the OR gate is electrically connected with the input end of the drive gate;
the output end of the driving gate is electrically connected with the controlled end of the solid-state bypass switch.
The RS latch is used for latching an overvoltage driving signal, two input ends of the OR gate are respectively and electrically connected with a first output end of the RS latch and a cathode of the breakdown diode BOD, and when voltage flows to the first input end of the OR gate through the breakdown diode BOD, the OR gate outputs a passive driving signal to a controlled end of the solid-state bypass switch through the driving gate; when the RS latch outputs the latched overvoltage drive signal to the second input terminal of the OR gate OR, the OR gate OR outputs a passive drive signal to the controlled terminal of the solid-state bypass switch via the drive gate.
In one embodiment, as shown in fig. 9, the bypass device further comprises a mechanical bypass switch,
The control end of the mechanical bypass switch is connected with an input switch of the system low-voltage power cabinet in series;
the input switch of the system low-voltage power cabinet is connected in parallel with the control switch of the main control device.
Interlocking a control end of the mechanical bypass switch with an input switch of a system low-voltage power cabinet and a control switch of a main control device, and ensuring that the bypass switch is in a closed state when the low-voltage power cabinet is not running, thereby ensuring uninterrupted power supply of a power grid system.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (6)
1. A bypass device comprising a solid state bypass switch, further comprising:
The active driving circuit is used for electrically connecting the main control device and the solid-state bypass switch and is used for driving the solid-state bypass switch to be conducted when receiving an enabling signal sent by the main control device; the main control device is used for outputting the enabling signal when detecting that the voltage quality of the overhead line system is abnormal;
the passive driving circuit is electrically connected with the solid-state bypass switch and is used for driving the solid-state bypass switch to be conducted when the voltage at two ends of the solid-state bypass switch is detected to exceed a preset threshold value;
the active driving circuit comprises a control circuit, a forward driving circuit and a flyback power supply circuit;
The control circuit is used for being electrically connected with the main control device and outputting a first driving signal when receiving the enabling signal;
The forward driving circuit is electrically connected with the control circuit and the solid-state bypass switch and is used for outputting an active driving signal to the solid-state bypass switch when receiving the first driving signal; the active driving signal is used for driving the solid-state bypass switch to be conducted;
the flyback power supply circuit is used for supplying power to the forward driving circuit and the control circuit;
the control circuit comprises a signal receiving unit and a first driving unit;
The input end of the signal receiving unit is electrically connected with the main control device and is used for receiving the enabling signal sent by the main control device; the output end is electrically connected with the first driving unit and is used for outputting a trigger signal to the first driving unit when receiving the enabling signal;
the first driving unit is electrically connected with the forward driving circuit and is used for outputting a first driving signal to the forward driving circuit when receiving the trigger signal;
The forward driving circuit comprises a first forward unit, a second forward unit and a forward control unit;
The forward control unit is electrically connected with the first driving unit and is used for outputting a first control signal to the first forward unit when receiving the first driving signal;
the first forward unit is used for outputting an active driving signal when receiving the first control signal;
The forward control unit is also used for outputting a first control signal to the second forward unit;
the second forward unit is used for outputting an active driving signal when receiving the first control signal;
the forward control unit comprises a peak current clamping module;
the first driving unit includes: NPN triode Q1, NPN triode Q2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, diode D1, diode D2, diode D3 and capacitor C1;
the first end of the resistor R1 is electrically connected with the output end of the signal receiving unit, and the second end of the resistor R1 is electrically connected with the anode of the diode D1;
the cathode of the diode D1 is electrically connected with the base electrode of the NPN triode Q1;
The collector electrode of the NPN triode Q1 is electrically connected with the first end of the resistor R2, and the emitter electrode is grounded;
the second end of the resistor R2 is electrically connected with the voltage output end of the flyback power supply circuit;
The first end of the resistor R3 is electrically connected with the first end of the resistor R2, and the second end of the resistor R3 is electrically connected with the first end of the resistor R4;
The second end of the resistor R4 is electrically connected with the anode of the diode D2;
the cathode of the diode D2 is electrically connected with the base electrode of the NPN triode Q2;
the collector electrode of the NPN triode Q2 is electrically connected with the first end of the resistor R5, and the emitter electrode is grounded;
the second end of the resistor R5 is used for being electrically connected with the reference power supply output end of the peak current clamping module;
The anode of the diode D3 is electrically connected with the first end of the resistor R5, and the cathode is electrically connected with the current feedback end of the peak current clamping module;
the first end of the resistor R6 is electrically connected with the collector electrode of the NPN triode, and the second end of the resistor R6 is electrically connected with the cathode electrode of the diode D3;
the first end of the capacitor C1 is electrically connected with the second end of the resistor R6 and the first driving signal receiving end of the forward control unit, and the second end is grounded;
The peak current clamping module comprises a pulse width modulation chip U1, a resistor R7, a resistor R8, an NPN triode Q3, a PNP triode Q4, an NPN triode Q5 and a PNP triode Q6;
The power input end of the pulse width modulation chip U1 is electrically connected with the power output end of the flyback power supply circuit, the reverse pulse output end is electrically connected with the power input end, the first in-phase input end is electrically connected with the second in-phase input end, the first reverse input end is electrically connected with the second reverse input end and the reference power output end, and the pulse signal reference ground end is electrically connected with the first end of the resistor R7 and the first end of the resistor R8;
the second end of the resistor R7 is electrically connected with the base electrode of the PNP triode Q4;
The collector of the PNP triode Q4 is grounded, and the emitter is electrically connected with the emitter of the NPN triode Q3;
the base electrode of the NPN triode Q3 is electrically connected with the second end of the resistor R7, the collector electrode is electrically connected with the power output end of the flyback power supply circuit, and the emitter electrode is electrically connected with the controlled end of the first forward unit;
the second end of the resistor R8 is electrically connected with the base electrode of the PNP triode Q6;
the collector of the PNP triode Q6 is grounded, and the emitter is electrically connected with the emitter of the NPN triode Q5;
And the base electrode of the NPN triode Q5 is electrically connected with the second end of the resistor R8, the collector electrode is electrically connected with the power output end of the flyback power supply circuit, and the emitter electrode is electrically connected with the controlled end of the second forward unit.
2. The bypass device of claim 1, wherein the flyback power supply circuit is a closed-loop control flyback circuit.
3. The bypass device of claim 1, wherein the passive drive circuit comprises:
the overvoltage protection circuit is used for outputting an overvoltage driving signal when the voltage at two ends of the solid-state bypass switch exceeds a preset threshold value;
the second driving circuit is used for receiving the overvoltage driving signal and latching, and outputting a passive driving signal to the solid-state bypass switch according to the overvoltage driving signal; the passive drive signal is used to indicate that the solid state bypass switch is on.
4. A bypass device as claimed in claim 3, characterized in that the overvoltage protection circuit comprises: resistor R9, resistor R10, diode D4, breakdown diode BOD, and capacitor C2;
the first end of the resistor R9 is electrically connected with the input end of the solid-state bypass switch, and the second end of the resistor R9 is electrically connected with the anode of the diode D4;
The cathode of the diode D4 is electrically connected with the anode of the breakdown diode BOD;
The cathode of the breakdown diode BOD is electrically connected with the first end of the resistor R10 and the input end of the second driving circuit;
The second end of the resistor R10 is electrically connected with the output end of the solid-state bypass switch;
The first end of the capacitor C2 is electrically connected to the first end of the resistor R10, and the second end is electrically connected to the second end of the resistor R10.
5. The bypass device as recited in claim 4, wherein the second drive circuit includes: RS latch, or gate, and drive gate;
The first signal input end of the RS latch is used as the input end of the second driving circuit and is electrically connected with the cathode of the breakdown diode BOD and the first input end of the OR gate; the second signal input end of the RS latch is grounded, and the first output end of the RS latch is electrically connected with the second input end of the OR gate;
the output end of the OR gate is electrically connected with the input end of the driving gate;
the output end of the driving gate is electrically connected with the controlled end of the solid-state bypass switch.
6. The bypass device as recited in claim 1, further comprising a mechanical bypass switch,
The control end of the mechanical bypass switch is connected with an input switch of the system low-voltage power cabinet in series;
the input switch of the system low-voltage power cabinet is connected in parallel with the control switch of the main control device.
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| CN202110355079.XA CN112993995B (en) | 2021-04-01 | 2021-04-01 | Bypass device |
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| CN202110355079.XA CN112993995B (en) | 2021-04-01 | 2021-04-01 | Bypass device |
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| CN112993995A (en) | 2021-06-18 |
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