CN111399578A - Airborne low-voltage stabilization control circuit - Google Patents
Airborne low-voltage stabilization control circuit Download PDFInfo
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- CN111399578A CN111399578A CN202010322511.0A CN202010322511A CN111399578A CN 111399578 A CN111399578 A CN 111399578A CN 202010322511 A CN202010322511 A CN 202010322511A CN 111399578 A CN111399578 A CN 111399578A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
Abstract
The invention provides an airborne low-voltage stabilization control circuit which is arranged on an aircraft and used for inhibiting bus bar undervoltage pulse at the starting moment of an engine at the front stage of an airborne power supply. The invention has reasonable design, adopts the multiphase interleaving boost chopper circuit, realizes the closed-loop regulation of the output voltage by controlling the switching state of the power field effect transistor, simultaneously, the input side of the power circuit is connected with the direct current contactor, the control signal of the direct current contactor integrates the control signal of the control circuit and the internal protection signal of the voltage stabilizer, when the control circuit gives the switching-on indication and the input voltage is in the set working interval, the main contact of the direct current contactor is closed, thereby keeping the stable output of the airborne voltage.
Description
Technical Field
The invention mainly relates to a voltage stabilizing circuit, in particular to an onboard low-voltage stabilizing control circuit.
Background
In the present aviation airborne power supply system, at the moment of starting an aircraft engine, the airborne confluence will have large-amplitude short-time under-voltage pulse, which can cause that part of equipment can not work normally, for example, the display black screen phenomenon can occur, and the normal work of the airborne equipment is seriously influenced by the problem.
Disclosure of Invention
Solves the technical problem
The invention mainly provides an airborne low-voltage-stabilizing control circuit which is used for stabilizing the power supply voltage of airborne equipment.
Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows: an airborne low-voltage stabilization control circuit is arranged on an aircraft and used for a front stage of an airborne power supply and inhibiting bus bar under-voltage pulse at the moment of starting an engine, and comprises a power circuit, a control circuit and an input contactor, wherein the input end of the power circuit is connected with the input contactor, the input contactor is connected with a bus, and the output end of the power circuit is connected with a plurality of loads;
the power circuit adopts a multiphase interleaving boost chopper circuit, returns a multiphase current sampling value and input and output voltage values to the control circuit, is provided with a plurality of power field effect transistors and is driven by the control circuit;
the control circuit is used for controlling the bus voltage VbusAn output voltage VregMonitoring, receiving upper control signal, and controlling the on-off state of power FET in the power circuit to output voltage VregThe closed-loop regulation keeps the stable output of the airborne voltage, further controls the opening and closing state of the input contactor and reports the working state of the input contactor to the outside;
the input contactor is a low-voltage large-current direct-current contactor, receives a driving signal of the control circuit, determines the opening and closing state of the input contactor, and realizes that the voltage stabilizer is separated from the direct-current bus in a fault state.
Furthermore, in the power circuit, each phase of circuit comprises an inductor, a power field-effect tube and a schottky diode, a group of precise large-current resistors for detecting the current of the field-effect tube are connected in series between each field-effect tube and the negative end of the bus, and two resistors in each group of precise large-current resistors are connected in parallel; the multiphase common input side and the output side are both connected with a plurality of capacitors, and the output end of the power circuit is connected with a plurality of large-current Schottky diodes which are respectively output to a plurality of paths of different loads.
Furthermore, the control circuit adopts a plurality of double-phase double-output asynchronous boost control chips to realize the staggered parallel connection of the multiphase boost chopper circuits, the power supply of the boost control chips is provided by the input voltage Vin of the power circuit, and when the input contactor is disconnected, Vin is zero, the power circuit stops working.
Furthermore, the boost control chip is a peak current mode pulse width modulation chip and comprises an output voltage outer ring and an inductive current inner ring, wherein in the power circuit, the peak value of the inductive current is consistent with the peak value of the current of the power field effect tube, so that the boost control chip collects four-phase current by detecting the voltage at two ends of a current sampling resistor connected with the multiphase power field effect tube in series, and the voltage ring needs to detect the output voltage V divided by the resistorreg。
Furthermore, the enable signal of the boost control chip is provided by two paths of signals, namely an input voltage Vin after voltage division by a resistor, and a temperature detection circuit;
when the temperature of the power circuit is normal, enabling signals are Vin subjected to resistance voltage division, when the voltage of an enabling pin is higher than an enabling threshold value, the boost control chip works normally, and when the voltage of the enabling pin is lower than the enabling threshold value, the boost control chip stops outputting pulse width modulation driving signals;
when the temperature of the temperature detection circuit which feeds back to the power circuit is too high, the voltage of the enable pin is pulled down to 0V, and the boost control chip stops working.
Further, when the system works at light load and when the inductive current is too large, the boost control chip can enter a hiccup mode to respectively realize output voltage stabilization and power tube current amplitude limiting.
Further, the specific working mode of the control circuit is as follows: when the input voltage VinWhen the output voltage is higher than the set point, the power field effect transistor in the power circuit does not work, and the output voltage VregFollowing the input voltage Vin(ii) a When the bus undervoltage pulse comes, the control circuit drives the power circuit to work to output a voltage VregAnd stabilizing at the output voltage set point, and keeping the onboard voltage stable output.
Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the invention has reasonable design, adopts the multiphase interleaving boost chopper circuit, when the input voltage is higher than the output voltage set point, the power field effect tube in the power circuit does not work, and the output voltage follows the input voltage; when bus undervoltage pulse comes, the control circuit drives the power circuit to work, the output voltage is stabilized at an output voltage set point, closed-loop regulation of the output voltage is realized by controlling the switching state of a power field effect transistor, meanwhile, a direct current contactor is connected to the input side of the power circuit, a control signal of the direct current contactor integrates a control signal of the control circuit and an internal protection signal of a voltage stabilizer, and when the control circuit gives a switching-on instruction and the input voltage is in a set working interval, a main contact of the direct current contactor is closed, so that stable output of airborne voltage is maintained; and when the inductive current is overlarge, the current amplitude limiting can be carried out on the power effect tube.
Drawings
FIG. 1 is a schematic block diagram of the circuit of the present invention;
FIG. 2 is a schematic diagram of the circuit of the present invention;
FIG. 3 is a schematic diagram of a power circuit of the present invention;
FIG. 4 is a schematic diagram of a temperature detection circuit according to the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the invention are shown, but which may be embodied in many different forms and are not limited to the embodiments described herein, but rather are provided for the purpose of providing a more thorough disclosure of the invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; the terms "vertical," "horizontal," "left," "right," and the like as used herein are 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; as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to the attached figure 1, the airborne low-voltage stabilization control circuit is arranged on an aircraft and used for inhibiting bus bar under-voltage pulse at the starting moment of an engine at a front stage of an airborne power supply, and comprises a power circuit, a control circuit and an input contactor KM, wherein the input end of the power circuit is connected with the input contactor, the input contactor is connected with a bus, and the output end of the power circuit is connected with a plurality of loads;
the power circuit adopts a four-phase interleaved boost chopper circuit, returns a four-phase current sampling value and input and output voltage values to the control circuit, is provided with a plurality of power field effect transistors and is driven by the control circuit;
the control circuit is used for controlling the bus voltage VbusAn output voltage VregMonitoring, receiving upper control signal, and controlling the on-off state of power FET in the power circuit to output voltage VregThe closed-loop regulation keeps the stable output of the airborne voltage, further controls the opening and closing state of the input contactor and reports the working state of the input contactor to the outside;
the input contactor is a low-voltage large-current direct-current contactor, receives a driving signal of the control circuit, determines the opening and closing state of the input contactor, and realizes that the voltage stabilizer is separated from the direct-current bus in a fault state.
Specifically, referring to fig. 2-3, in the power circuit, each phase of circuit includes an inductor (corresponding to L1-L4, respectively), a power fet (corresponding to Q1-Q4, respectively) and a schottky diode (corresponding to D1-D4, a set of precise high-current resistors for detecting fet current (corresponding to R1-R8, respectively) are connected in series between each fet and the negative terminal of the bus, each set of precise high-current resistors has resistors connected in parallel, R1 and R2 are connected in parallel, R3 and R4 are connected in parallel, specifically referring to fig. 3, multiple capacitors are connected to the multi-phase common input side and output side, the capacitors at the input side correspond to C1 and C2, the filter capacitors at the output side correspond to C4-C10, and the output end of the power circuit is connected with two high-current schottky diodes (corresponding to D11 and D12, respectively, and the two schottky diodes are used for ensuring forward high current to loads or avoiding reverse load current between the bus and the load.
In the embodiment, a driving signal of the power field effect transistor is given by the control circuit, and the power circuit returns a four-phase current sampling value and input and output voltage values to the control circuit, because main devices of the power circuit have higher loss, particularly the field effect transistor, an aluminum-based printed circuit board is adopted as a substrate of the power circuit during design, so that good heat dissipation of the power circuit is ensured, and meanwhile, when the field effect transistor is selected, on the premise of ensuring enough current quota, a model with smaller requirements on a conduction resistor and grid charge is selected, the scheme adopts the voltage and current quota of 100V and 170A respectively, and the conduction resistor is 15m omega, so that the conduction loss and the switching loss of the field effect transistor are reduced; the inductor is a high-current inductor, the winding is formed by winding a flat wire, the direct-current resistance of the coil is small, and a magnetic circuit is not easy to saturate; the conduction voltage drop of the Schottky diode is 0.9V, and compared with the traditional ultrafast recovery diode, the Schottky diode is lower in conduction loss; meanwhile, a CT4502 type multilayer ceramic dielectric capacitor is selected as a high-capacity filter capacitor, and compared with an electrolytic capacitor, the high-capacity filter capacitor is higher in reliability, small in loss and smaller in volume.
The control circuit adopts a plurality of double-phase double-output asynchronous boost control chips to realize the staggered parallel connection of the multiphase boost chopper circuits, the power supply of the boost control chips is provided by the input voltage Vin of the power circuit, and when the input contactor is disconnected, Vin is zero, the power circuit stops working.
The boost control chip is a peak current mode pulse width modulation chip and comprises an output voltage outer ring and an inductive current inner ring, wherein in the power circuit, the peak value of the inductive current is consistent with the peak value of the current of the power field effect tube, so that the boost control chip collects four-phase current by detecting the voltage at two ends of a current sampling resistor connected with the multiphase power field effect tube in series, and a voltage ring needs to detect the output voltage V divided by the resistorreg。
The enabling signal of the boost control chip is provided by two paths of signals, namely an input voltage Vin after resistance voltage division and a temperature detection circuit; when the temperature of the power circuit is normal, enabling signals are Vin subjected to resistance voltage division, when the voltage of an enabling pin is higher than an enabling threshold value, the boost control chip works normally, and when the voltage of the enabling pin is lower than the enabling threshold value, the boost control chip stops outputting pulse width modulation driving signals; when the temperature of the temperature detection circuit which feeds back to the power circuit is too high, the voltage of the enable pin is pulled down to be close to 0V, and the boost control chip stops working.
Specifically, referring TO fig. 4, the temperature sensor is a TD590 current source type temperature sensor packaged in an in-line TO-52 package, L T431 and a transistor BT8550 form a simple comparator circuit, and once the output current of the temperature sensor TD590 exceeds a certain threshold (which can be adjusted by modifying the resistance of a load resistor of the TD 590), the transistor BT8050 enters a saturation operating state, and the RUN signal (i.e., the enable signal of the boost control chip) is pulled low, so that the boost control chip stops operating.
In this embodiment, compared with the conventional single voltage ring control, the boost control chip has the advantages that the closed-loop adjustment speed of the output voltage under the control of the peak current is higher, and the boost control chip naturally has the characteristic of inductive current amplitude limiting; when the system works at light load and the inductive current is overlarge, the boost control chip can enter a hiccup mode to respectively realize output voltage stabilization and power tube current amplitude limiting.
The specific working mode of the control circuit is as follows: when the input voltage VinWhen the output voltage is higher than the set point, the power field effect transistor in the power circuit does not work, and the output voltage VregFollowing the input voltage Vin(ii) a When the bus undervoltage pulse comes, the control circuit drives the power circuit to work to output a voltage VregAnd stabilizing at the output voltage set point, and keeping the onboard voltage stable output.
In conclusion, the invention has reasonable design, adopts the multiphase interleaving boost chopper circuit, and when the input voltage V isinWhen the output voltage is higher than the set point, the power field effect transistor in the power circuit does not work, and the output voltage VregFollowing the input voltage Vin(ii) a When the bus undervoltage pulse comes, the control circuit drives the power circuit to work to output a voltage VregStabilizing at the output voltage set point, and controlling the on-off state of the power FET to realize the output voltage VregWhile the input side of the power circuit is connected to a DC contactor whose control signals are integratedThe control circuit gives a switching-on instruction and inputs a voltage VinWhen the direct current contactor is in a set working interval, the main contact of the direct current contactor is closed, so that the stable output of the airborne voltage is kept; and when the inductive current is overlarge, the current amplitude limiting can be carried out on the power effect tube.
The above-mentioned embodiments only express a certain implementation mode of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention; it should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which are within the protection scope of the present invention; therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. The utility model provides an airborne low pressure steady voltage control circuit, sets up on the aircraft carries for aircraft carries the power preceding stage, suppresses the instantaneous busbar under-voltage pulse of engine start, its characterized in that includes: the power circuit comprises a power circuit, a control circuit and an input contactor, wherein the input end of the power circuit is connected with the input contactor, the input contactor is connected with a bus, and the output end of the power circuit is connected with a plurality of loads;
the power circuit adopts a multiphase interleaving boost chopper circuit, returns a multiphase current sampling value and input and output voltage values to the control circuit, is provided with a plurality of power field effect transistors and is driven by the control circuit;
the control circuit is used for controlling the bus voltage VbusAn output voltage VregMonitoring, receiving upper control signal, and controlling the on-off state of power FET in the power circuit to output voltage VregThe closed-loop regulation keeps the stable output of the airborne voltage, further controls the opening and closing state of the input contactor and reports the working state of the input contactor to the outside;
the input contactor is a low-voltage large-current direct-current contactor, receives a driving signal of the control circuit, determines the opening and closing state of the input contactor, and realizes that the voltage stabilizer is separated from the direct-current bus in a fault state.
2. An on-board low voltage regulation control circuit as claimed in claim 1, wherein: in the power circuit, each phase of circuit comprises an inductor, a power field-effect tube and a Schottky diode, a group of precise high-current resistors are connected in series between each field-effect tube and the negative end of a bus for detecting the current of the field-effect tube, and two resistors in each group of precise high-current resistors are connected in parallel; the multiphase common input side and the output side are both connected with a plurality of capacitors, and the output end of the power circuit is connected with a plurality of large-current Schottky diodes which are respectively output to a plurality of paths of different loads.
3. The on-board low voltage regulation control circuit of claim 1, wherein: the control circuit adopts a plurality of double-phase double-path output asynchronous boost control chips to realize the staggered parallel connection of the multiphase boost chopper circuits, and the boost control chips are supplied with power by the input voltage V of the power circuitinProviding, when the input contactor is open, VinAnd zero, the power circuit stops working.
4. The on-board low voltage regulation control circuit of claim 3, wherein: the boost control chip is a peak current mode pulse width modulation chip and comprises an output voltage outer ring and an inductive current inner ring, wherein in the power circuit, the peak value of the inductive current is consistent with the current peak value of a power device, so that the boost control chip collects four-phase current by detecting the voltage at two ends of a current sampling resistor connected with a multiphase power field effect tube in series, and a voltage loop needs to detect the output voltage V divided by the resistorreg。
5. The on-board low voltage regulation control circuit of claim 4, wherein: the enabling signal of the boost control chip is provided by two paths of signals, namely an input voltage Vin after resistance voltage division and a temperature detection circuit;
when the temperature of the power circuit is normal, enabling signals are Vin subjected to resistance voltage division, when the voltage of an enabling pin is higher than an enabling threshold value, the boost control chip works normally, and when the voltage of the enabling pin is lower than the enabling threshold value, the boost control chip stops outputting pulse width modulation driving signals;
when the temperature of the temperature detection circuit which feeds back to the power circuit is too high, the voltage of the enable pin is pulled down to 0V, and the boost control chip stops working.
6. The on-board low voltage regulation control circuit of claim 5, wherein: when the system works at light load and the inductive current is overlarge, the boost control chip can enter a hiccup mode to respectively realize output voltage stabilization and power tube current amplitude limiting.
7. The on-board low voltage regulation control circuit of claim 1, wherein: the specific working mode of the control circuit is as follows: when the input voltage VinWhen the output voltage is higher than the set point, the power field effect transistor in the power circuit does not work, and the output voltage VregFollowing the input voltage Vin(ii) a When the bus undervoltage pulse comes, the control circuit drives the power circuit to work to output a voltage VregAnd stabilizing at the output voltage set point, and keeping the onboard voltage stable output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010322511.0A CN111399578A (en) | 2020-04-22 | 2020-04-22 | Airborne low-voltage stabilization control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010322511.0A CN111399578A (en) | 2020-04-22 | 2020-04-22 | Airborne low-voltage stabilization control circuit |
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| CN202010322511.0A Pending CN111399578A (en) | 2020-04-22 | 2020-04-22 | Airborne low-voltage stabilization control circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114637366A (en) * | 2022-05-18 | 2022-06-17 | 成都本原聚能科技有限公司 | Detection circuit and chip independent of process and temperature and application of lumen detection |
| CN115373456A (en) * | 2022-09-20 | 2022-11-22 | 中国电子科技集团公司第二十四研究所 | Output pole dynamic tracking compensation parallel modulation low dropout linear regulator |
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Address after: 241000 No.14, henglangshan Road, high tech Industrial Development Zone, Yijiang District, Wuhu City, Anhui Province Applicant after: ANHUI HUAXIA DISPLAY TECHNOLOGY Co.,Ltd. Address before: 241000 factory building No.4, high tech Development Zone, Yijiang District, Wuhu City, Anhui Province Applicant before: ANHUI HUAXIA DISPLAY TECHNOLOGY Co.,Ltd. |
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Application publication date: 20200710 |