CN212183102U - Low-voltage circuit breaker for lane controller - Google Patents
Low-voltage circuit breaker for lane controller Download PDFInfo
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- CN212183102U CN212183102U CN202020991912.0U CN202020991912U CN212183102U CN 212183102 U CN212183102 U CN 212183102U CN 202020991912 U CN202020991912 U CN 202020991912U CN 212183102 U CN212183102 U CN 212183102U
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Abstract
The utility model provides a low-voltage circuit breaker for lane controller, it includes hall current sensor, trouble trigger circuit and current conversion circuit, trouble trigger circuit includes voltage comparator and MOS driver chip; by arranging the voltage comparator and the MOS driving chip in the fault trigger circuit, when a fault occurs, the output result of the voltage comparator changes, the MOS driving chip drives the trend of the current in the converter circuit, and the current rise rate of the main circuit is lower than that of the converter circuit through a resonance principle, so that the fault current in the main circuit is forced to be rapidly reduced to zero, a channel between a load and a lane controller is cut off, and the purpose of protecting the lane controller is achieved; the inductor L16 is arranged in the commutation circuit, so that shorter commutation time can be obtained, and the smaller the inductance value of the inductor L16 is, the shorter the commutation time is; the capacitor C42 can reduce the duration of the resonant process of the commutation circuit.
Description
Technical Field
The utility model relates to a lane controller field especially relates to a low voltage circuit breaker for lane controller.
Background
At present, most of the existing expressways in China are toll roads, artificial toll collection is dominant, and with the development of science and technology, particularly the development of automation technology and the improvement of travel demand, an ETC (electronic toll collection) system for electronic toll collection is rapidly popularized in recent years. In recent years, the rapid development of the embedded vision technology enables the embedded vision recognition system based on the gigabit network technology to be widely popularized, the license plate recognition system can transmit image and video information to a charging management platform computer through an Ethernet interface and can also transmit recognized license plate data to a lane controller through a field bus, and the lane controller controls the display or action of a charging display, a barrier machine and a signal lamp according to the recognized license plate data. Therefore, the lane controller is a core device of the ETC system, and the low-voltage circuit breaker is an electrical appliance for automatically performing voltage loss, undervoltage, overload and short-circuit protection, and is widely applied to the lane controller. However, due to the limitations of the on-resistance and the turn-off capability of the power semiconductor devices inside the low-voltage circuit breaker, the low-voltage circuit breaker tends to have a lower fault current interruption capability. Therefore, in order to solve the above problems, the utility model provides a low-voltage circuit breaker for lane controller optimizes the structure of design low-voltage circuit breaker, makes it have lower consumption and stronger fault current interruption ability.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a low-voltage circuit breaker for lane controller optimizes the structure of design low-voltage circuit breaker, makes it have lower consumption and stronger fault current interruption ability.
The technical scheme of the utility model is realized like this: the utility model provides a low-voltage circuit breaker for a lane controller, which comprises a Hall current sensor, a fault trigger circuit and a current conversion circuit, wherein the fault trigger circuit comprises a voltage comparator and an MOS (metal oxide semiconductor) driving chip;
the Hall current sensor comprises a magnetic ring with N coils, a Hall element and a current acquisition circuit;
the Hall element is electrically connected with one end of the coil through the current acquisition circuit, the other end of the coil is electrically connected with the input end of the MOS driving chip through the voltage comparator, and the output end of the MOS driving chip is electrically connected with the power supply through the current conversion circuit.
On the basis of the above technical solution, preferably, the method further includes: a main circuit;
the main circuit comprises a MOS transistor Q10;
the drain of the MOS transistor Q10 is electrically connected to the power supply line, the source of the MOS transistor Q10 is electrically connected to the power supply via the lane controller, and the gate of the MOS transistor Q10 is electrically connected to the output of the MOS driver chip.
Further preferably, the voltage comparator comprises resistors R68-R70, an amplifier TL082 and a MOS tube driving chip;
the non-inverting input end of the amplifier TL082 is electrically connected with the other end of the coil and one end of the resistor R70 respectively, the other end of the resistor R70 is grounded, the inverting input end of the amplifier TL082 is electrically connected with one end of the resistor R67 and one end of the resistor R68 respectively, the other end of the resistor R67 is grounded, the other end of the resistor R68 is electrically connected with a power supply, the output end of the amplifier TL082 is electrically connected with two input ends of the MOS tube driving chip and one end of the resistor R69 respectively, the other end of the resistor R69 is electrically connected with the power supply, and two output ends of the MOS tube driving chip are electrically connected with the input end of the commutation.
Further preferably, the inverter circuit comprises a MOS transistor Q8, a diode D11, an inductor L16 and a capacitor C42;
the first output end of the MOS tube driving chip is electrically connected with the grid of the MOS tube Q8, the source of the MOS tube Q8 is grounded, the drain of the MOS tube Q8 is electrically connected with the cathode of the diode D11, the anode of the diode D11 is electrically connected with the drain of the MOS tube Q10 through the inductor L16 and the capacitor C42 which are connected in series, the drain of the MOS tube Q10 is electrically connected with a power supply, the source of the MOS tube Q10 is grounded, and the second output end of the MOS tube driving chip is electrically connected with the grid of the MOS tube Q10.
Further preferably, the MOS tube driving chip is a TC4427EOA chip.
The utility model discloses a low voltage circuit breaker for lane controller has following beneficial effect for prior art:
(1) by arranging the voltage comparator and the MOS driving chip in the fault trigger circuit, when a fault occurs, the output result of the voltage comparator changes, the MOS driving chip drives the trend of the current in the converter circuit, and the current rise rate of the main circuit is lower than that of the converter circuit through a resonance principle, so that the fault current in the main circuit is forced to be rapidly reduced to zero, a channel between a load and a lane controller is cut off, and the purpose of protecting the lane controller is achieved;
(2) the inductor L16 is arranged in the commutation circuit, so that shorter commutation time can be obtained, and the smaller the inductance value of the inductor L16 is, the shorter the commutation time is; the capacitor C42 can reduce the duration of the resonant process of the commutation circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a low voltage circuit breaker for a lane controller according to the present invention;
fig. 2 is a circuit diagram of a low-voltage circuit breaker for a lane controller according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 1, the utility model discloses a low voltage circuit breaker for lane controller, it includes hall current sensor, current acquisition circuit, trouble trigger circuit, main circuit and current conversion circuit.
The Hall current sensor is used for monitoring the current flowing into the lane controller in real time. In this embodiment, a hall current sensor with a high height commonly used in the market is adopted, and improvement on the hall current sensor is not involved. Generally, a hall current sensor includes a magnetic ring with N coils, a hall element and a current collecting circuit, a measured lead passes through the magnetic ring, a magnetic field exists around the current on the lead, the magnitude of the magnetic field is in direct proportion to the current in the lead, and the magnitude of the current of the lead can be determined by measuring the magnetic field with the hall element under the action of the magnetic field. In this embodiment, the hall element is electrically connected to one end of the coil through the current collecting circuit, the other end of the coil is electrically connected to the input end of the MOS driver chip through the voltage comparator, and the output end of the MOS driver chip is electrically connected to the power supply through the current converting circuit.
Preferably, the main circuit is used for communicating the lane controller with a power supply and transmitting current to the lane controller; in this embodiment, as shown in fig. 2, the main circuit includes a MOS transistor Q10; specifically, the drain of the MOS transistor Q10 is electrically connected to the power supply line, the source of the MOS transistor Q10 is grounded via the lane controller, and the gate of the MOS transistor Q10 is electrically connected to the output terminal of the MOS driver chip.
When the line normally works, the MOS tube Q10 is in a conducting state, the power supply line directly supplies power to the responsible power supply through the MOS tube Q10, and at the moment, the commutation circuit is in a cut-off state.
Preferably, the fault trigger circuit is configured to, when a short circuit occurs in a line in the lane controller, increase a current in the line, and call the current as a fault current, where the fault current is collected by the fault trigger circuit, and then a fault protection action is performed. In the present embodiment, the fault triggering circuit includes a voltage comparator and a MOS driving chip; the voltage comparator is used for judging whether a fault occurs or not, and when the fault occurs, the output result of the voltage comparator changes so as to trigger the converter circuit to execute fault protection action; the MOS driving chip is a driving element for driving the converter circuit to execute fault protection action.
In this embodiment, as shown in FIG. 2, the voltage comparator includes resistors R68-R70 and an amplifier TL 082; the non-inverting input end of the amplifier TL082 is electrically connected with the other end of the coil and one end of the resistor R70 respectively, the other end of the resistor R70 is grounded, the inverting input end of the amplifier TL082 is electrically connected with one end of the resistor R67 and one end of the resistor R68 respectively, the other end of the resistor R67 is grounded, the other end of the resistor R68 is electrically connected with a power supply, the output end of the amplifier TL082 is electrically connected with two input ends of the MOS tube driving chip and one end of the resistor R69 respectively, the other end of the resistor R69 is electrically connected with the power supply, and two output ends of the MOS tube driving chip are electrically connected with the input end of the commutation. The reference voltage of the voltage comparator is determined by the resistance values of the resistor R67 and the resistor R68, the current collected by the Hall current sensor is converted into voltage through the resistor R70, the voltage value is used as the input voltage of the voltage comparator, when the voltage value is higher than the reference voltage, fault current occurs in a line, the voltage comparator outputs high level, and otherwise, low level is output.
Further preferably, the inverter circuit reduces the fault current to 0, thereby functioning as a protection circuit. In this embodiment, as shown in fig. 2, the inverter circuit includes a MOS transistor Q8, a diode D11, an inductor L16, and a capacitor C42; the first output end of the MOS tube driving chip is electrically connected with the grid of the MOS tube Q8, the source of the MOS tube Q8 is grounded, the drain of the MOS tube Q8 is electrically connected with the cathode of the diode D11, the anode of the diode D11 is electrically connected with the drain of the MOS tube Q10 through the inductor L16 and the capacitor C42 which are connected in series, the drain of the MOS tube Q10 is electrically connected with a power supply, the source of the MOS tube Q10 is grounded, and the second output end of the MOS tube driving chip is electrically connected with the grid of the MOS tube Q10. The capacitor C42 is a discharge capacitor of the pre-charged converter circuit; the inductor L16 is the inductor of the commutation circuit; the diode D11 avoids the device in the commutation circuit from being burnt out in the process of long-term large current oscillation, and the resonant current in the commutation circuit disappears after zero crossing due to the rectifying effect of the diode D11; after the commutation circuit is cut off, the reverse voltage across the capacitor C42 will drop on the diode D11, thereby preventing the device MOS transistor Q8 from being in a reverse bias state.
When the circuit normally works, the MOS tube Q10 is in a conducting state, the power supply line directly supplies power to the responsible power supply through the MOS tube Q10, and at the moment, the converter circuit is in a cut-off state;
when a line has a fault, the fault trigger circuit is triggered, the fault current in the line also rises rapidly, the current sampling circuit feeds the fault current back to the fault trigger circuit, the output voltage of a comparator in the fault trigger circuit is switched from low level to high level, at the moment, the MOS tube Q8 and the driving MOS tube Q10 are driven by the MOS tube driving chip, at the moment, the MOS tube Q8 and the driving MOS tube Q10 are both conducted, the current conversion circuit is conducted, the current flows through the current conversion circuit, and the current rise rate of the current conversion circuit is far greater than that of the current on a power supply, so that the fault current in the main circuit is forced to be reduced to zero rapidly, a passage between a load and a lane controller is cut off, and the purpose of protecting the lane controller is achieved.
The beneficial effect of this embodiment does: by arranging the voltage comparator and the MOS driving chip in the fault trigger circuit, when a fault occurs, the output result of the voltage comparator changes, the MOS driving chip drives the trend of the current in the converter circuit, and the current rise rate of the main circuit is lower than that of the converter circuit through a resonance principle, so that the fault current in the main circuit is forced to be rapidly reduced to zero, a channel between a load and a lane controller is cut off, and the purpose of protecting the lane controller is achieved;
the inductor L16 is arranged in the commutation circuit, so that shorter commutation time can be obtained, and the smaller the inductance value of the inductor L16 is, the shorter the commutation time is; the capacitor C42 can reduce the duration of the resonant process of the commutation circuit.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A low-voltage circuit breaker for a lane controller, comprising a Hall current sensor, a fault triggering circuit and a commutation circuit, characterized in that: the fault trigger circuit comprises a voltage comparator and an MOS driving chip;
the Hall current sensor comprises a magnetic ring with N coils, a Hall element and a current acquisition circuit;
the Hall element is electrically connected with one end of the coil through the current acquisition circuit, the other end of the coil is electrically connected with the input end of the MOS driving chip through the voltage comparator, and the output end of the MOS driving chip is electrically connected with the power supply through the current conversion circuit.
2. A low-voltage circuit breaker for a track controller as claimed in claim 1, characterized in that: further comprising: a main circuit;
the main circuit comprises a MOS transistor Q10;
the drain electrode of the MOS tube Q10 is electrically connected with the power supply line, the source electrode of the MOS tube Q10 is electrically connected with the power supply through the lane controller, and the grid electrode of the MOS tube Q10 is electrically connected with the output end of the MOS drive chip.
3. A low-voltage circuit breaker for a track controller as claimed in claim 2, characterized in that: the voltage comparator comprises resistors R68-R70, an amplifier TL082 and an MOS tube driving chip;
the non-inverting input end of the amplifier TL082 is electrically connected with the other end of the coil and one end of the resistor R70 respectively, the other end of the resistor R70 is grounded, the inverting input end of the amplifier TL082 is electrically connected with one end of the resistor R67 and one end of the resistor R68 respectively, the other end of the resistor R67 is grounded, the other end of the resistor R68 is electrically connected with a power supply, the output end of the amplifier TL082 is electrically connected with two input ends of the MOS tube driving chip and one end of the resistor R69 respectively, the other end of the resistor R69 is electrically connected with the power supply, and two output ends of the MOS tube driving chip are electrically connected with the input end of the commutation circuit.
4. A low-voltage circuit breaker for a track controller as claimed in claim 3, characterized in that: the commutation circuit comprises a MOS transistor Q8, a diode D11, an inductor L16 and a capacitor C42;
the first output end of the MOS tube driving chip is electrically connected with a grid electrode of an MOS tube Q8, a source electrode of the MOS tube Q8 is grounded, a drain electrode of the MOS tube Q8 is electrically connected with a cathode of a diode D11, an anode of the diode D11 is electrically connected with a drain electrode of the MOS tube Q10 through an inductor L16 and a capacitor C42 which are connected in series, a drain electrode of the MOS tube Q10 is electrically connected with a power supply, a source electrode of the MOS tube Q10 is grounded, and a second output end of the MOS tube driving chip is electrically connected with a grid electrode of the MOS tube Q10.
5. A low-voltage circuit breaker for a track controller as claimed in claim 4, characterized in that: the MOS tube driving chip is a TC4427EOA chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020991912.0U CN212183102U (en) | 2020-06-03 | 2020-06-03 | Low-voltage circuit breaker for lane controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020991912.0U CN212183102U (en) | 2020-06-03 | 2020-06-03 | Low-voltage circuit breaker for lane controller |
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| CN212183102U true CN212183102U (en) | 2020-12-18 |
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| CN202020991912.0U Active CN212183102U (en) | 2020-06-03 | 2020-06-03 | Low-voltage circuit breaker for lane controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112712689A (en) * | 2020-12-29 | 2021-04-27 | 中车永济电机有限公司 | Multifunctional photoelectric signal acquisition device |
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2020
- 2020-06-03 CN CN202020991912.0U patent/CN212183102U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112712689A (en) * | 2020-12-29 | 2021-04-27 | 中车永济电机有限公司 | Multifunctional photoelectric signal acquisition device |
| CN112712689B (en) * | 2020-12-29 | 2022-06-14 | 中车永济电机有限公司 | Multifunctional photoelectric signal acquisition device |
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