CN109788610B - PBA hard wire dimming control circuit compatible with PWM signals - Google Patents
PBA hard wire dimming control circuit compatible with PWM signals Download PDFInfo
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Abstract
The invention discloses a PBA (physical assist brake assist) hard-line dimming control circuit compatible with a PWM (pulse-width modulation) signal, which comprises a hard-line dimming unit compatible with the PWM signal, wherein the hard-line dimming unit is provided with a BRT/DIM (binary analog to digital) signal input end, a first resistor, a second resistor, a third resistor, a first diode and a first N-channel CMOS (complementary metal oxide semiconductor) tube; and a PBA lighting control unit having a LIGHT _ CRT control signal input terminal, a fourth resistor, a fifth resistor, and a second N-channel COMS tube. Compared with the prior art, the invention has the advantages that: the PBA is lightened and the LIGHT modulation is controlled by hard wires of the BRT/DIM input end and the LIGHT _ CRT input end, so that the problem of independent LIGHT modulation control of the hard wires of the common anode double display PBA is solved, the comfort level of an aircraft cockpit is improved, and the reliability of an airborne system is improved.
Description
Technical Field
The invention relates to a PBA (push-button switch) with a lamp in airborne equipment, in particular to a PBA hard wire dimming control circuit compatible with a PWM (pulse-width modulation) signal.
Background
The aircraft control panel assembly is a man-machine interaction interface between an aircraft unit and each system of the aircraft, various control and display devices for state control and state display of each system of the aircraft are installed in the control panel assembly, and control operation and system state display of each system of the aircraft are provided for the aircraft unit. The flight crew controls and operates each system of the airplane by operating various control devices (a rotary switch, a potentiometer, a push switch, a PBA and the like) on the control panel assembly, and acquires the state information of each system of the airplane by indicating information on the control panel. PBA is very popular as a device for switch input and system status on aircraft control panel assemblies. The requirements on the safety of an airborne system and the comfort of the cabin environment are higher and higher, and new requirements on character display brightness adjustment and reliability of the PBA are also provided.
Disclosure of Invention
The invention aims to improve the reliability and comfort of PBA display dimming control, and provides a PBA hard wire dimming control circuit compatible with a PWM signal.
In order to realize the purpose, the technical scheme of the invention is as follows: a PBA hard-wired dimming control circuit compatible with PWM signal comprises,
the hard wire dimming unit compatible with the PWM signal is provided with a BRT/DIM signal input end, a first resistor, a second resistor, a third resistor, a first diode and a first N-channel CMOS (complementary metal oxide semiconductor) tube, wherein the BRT/DIM signal input end is connected with a first end of the first resistor, a second end of the first resistor is connected with an anode of the first diode, a cathode of the first diode is respectively connected with a first end of the second resistor and a grid electrode of the first N-channel COMS tube, a drain electrode of the first N-channel COMS tube is connected with a first end of the third resistor, a second end of the second resistor is respectively connected with a second end of the third resistor and a source electrode of the first N-channel COMS tube, the first end of the third resistor is a current input end of the hard wire dimming unit, and the second end of the third resistor is a current output end of the hard wire dimming unit; and (c) a second step of,
the PBA lighting control unit is provided with a LIGHT _ CRT control signal input end, a fourth resistor, a fifth resistor and a second N-channel COMS tube, wherein the LIGHT _ CRT control signal input end is connected with a first end of the fourth resistor, a second end of the fourth resistor is respectively connected with a first end of the fifth resistor and a grid electrode of the second N-channel COMS tube, a second end of the fifth resistor is respectively connected with a power ground and a source electrode of the second N-channel COMS tube, and a drain electrode of the second N-channel COMS tube is connected with a current output end of the hard wire dimming unit.
Compared with the prior art, the invention has the advantages that: the utility model provides a novel compatible PWM signal's PBA hardwire dimming control circuit, through the hardwire control to BRT DIM input and LIGHT _ CRT input, realize lighting of PBA, dimming control, solve the hard wire independent dimming control of two display PBA of common anode, improve the comfort level in aircraft cockpit, improve the reliability of airborne system.
Drawings
Fig. 1 is a schematic circuit diagram according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
Referring to fig. 1, a PWM signal compatible PBA hardwired dimming control circuit is shown. The system mainly comprises a hard wire dimming unit compatible with a PWM signal and a PBA lighting control unit.
The hard-line dimming unit compatible with the PWM signal is provided with a BRT/DIM signal input end, a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1 and a first N-channel CMOS tube. The BRT/DIM signal input is connected with a first end of a first resistor R1. The second end of the first resistor R1 is connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to the first end of the second resistor R2 and the gate of the first N-channel COMS transistor, respectively. The drain of the first N-channel COMS transistor Q1 is connected to the first terminal of the third resistor R3. The second end of the second resistor R2 is connected to the second end of the third resistor R3 and the source of the first N-channel COMS transistor Q1, respectively. Wherein. The first terminal of the third resistor R3 is the current input terminal of the hard-wired dimming unit. The second terminal of the third resistor R3 is the current output terminal of the hard-wired dimming unit.
The PBA lighting control unit is provided with a LIGHT _ CRT control signal input end, a fourth resistor R4, a fifth resistor R5 and a second N-channel COMS tube Q2. The LIGHT _ CRT control signal input is connected to a first end of a fourth resistor R4. The second end of the fourth resistor R4 is connected to the first end of the fifth resistor R5 and the gate of the second N-channel cmos transistor Q2, respectively. The second terminal of the fifth resistor R5 is connected to the ground and the source of the second N-channel COMS transistor Q2, respectively. The drain of the second N-channel COMS Q2 is connected to the current output of the hardwired dimming cell.
When the LIGHT _ CRT control signal is high (3.5 to 5V in this embodiment), the PBA is turned on. When the voltage is low (0 to 1.5V in this example), PBA is turned off.
When the LIGHT _ CRT control signal is at a high level, the LIGHT _ CRT control signal is divided by the fourth resistor R4 and the fifth resistor R5 and then provided to the gate G of the second N-channel cmos tube Q2, the voltage obtained by the gate G of the second N-channel cmos tube Q2 is greater than the maximum gate-source turn-on threshold voltage of the second N-channel cmos tube Q2, the second N-channel cmos tube Q2 is turned on, the current flowing through the PBA flows to the ground through the second N-channel cmos tube Q2, and the PBA is turned on. At the moment of starting, a LIGHT _ CRT control signal charges two ends of a gate-source parasitic capacitor Cgs of a second N-channel COMS tube Q2 through a fourth resistor R4, when the voltage reaches the lowest starting voltage of the second N-channel COMS tube Q2, the parasitic capacitor Cgd of the second N-channel COMS tube Q2 discharges through a second N-channel COMS tube Q2 and a fifth resistor R5, the fourth resistor R4 and the fifth resistor R5, and the rising edge of the PBA starting current is influenced by values of the drain-gate parasitic capacitor Cds and the gate-source parasitic capacitor Cds of the second N-channel COMS tube Q2. The parameters of the fourth resistor R4 and the fifth resistor R5 may be altered if there are special requirements on the rising edge time.
When the LIGHT _ CRT control signal is at a low level, the LIGHT _ CRT control signal is divided by the fourth resistor R4 and the fifth resistor R5 and then provided to the gate G of the second N-channel cmos tube Q2, the voltage obtained by the gate G of the second N-channel cmos tube Q2 is smaller than the gate-source minimum on-threshold voltage of the second N-channel cmos tube Q2, the second N-channel cmos tube Q2 is turned off, the current flowing through the PBA is zero, and the PBA is turned off. At the moment when the LIGHT _ CRT control signal is switched from a high level to a low level, the gate-source parasitic capacitance Cgs of the second N-channel COMS tube Q2 is discharged through the fourth resistor R4 and the fifth resistor R5, when the voltage is lower than the turn-on voltage of the second N-channel COMS tube Q2, the drain-source parasitic capacitance Cgd of the second N-channel COMS tube Q2 is charged through flowing PBA current, and the falling edge of the PBA extinguishing current is influenced by the values of the drain-gate parasitic capacitance Cds and the gate-source parasitic capacitance Cds of the second N-channel COMS tube Q2 through the fourth resistor R4 and the fifth resistor R5. The parameters of the fourth resistor R4 and the fifth resistor R5 may be altered if there are special requirements for the rising edge time.
When the PBA lighting control circuit is closed, the BRT/DIM signal input end potential of the hard wire dimming circuit compatible with the PWM signal is lower than the current output end potential of the hard wire dimming circuit compatible with the PWM signal, no current flows through the PBA, and the PBA is turned off.
When the PBA lighting control circuit is turned on, the current output end of the hard-line dimming circuit compatible with the PWM signal is connected to the power ground through a second N-channel CMOS tube Q2 of the PBA lighting control circuit. At the input end of BRT/DIM signal, high level (3.5-5V in this embodiment) makes PBA work in BRT mode (bright mode), and low level (0-1.5V in this embodiment) makes PBA work in DIM mode (dark mode). The high level of a LIGHT _ CRT control signal is supplied to a grid electrode G of a first N-channel COMS tube Q1 after being subjected to voltage division through a first resistor R1, a first secondary tube D1 and a second resistor R2, the voltage obtained by a grid source GS of the first N-channel COMS tube Q1 is larger than the grid source starting threshold voltage of the first N-channel COMS tube Q1, the first N-channel COMS tube Q1 is conducted, a third resistor R3 is in short circuit, current flowing through a PBA flows to a power ground through the first N-channel COMS tube Q1 and a PBA lighting control circuit, and the PBA obtains rated working voltage and works in a BRT mode. At the moment of starting the BRT mode, the high level of the LIGHT _ CRT charges two ends of a gate-source parasitic capacitor Cgs of a first N-channel COMS tube Q1 through a first resistor R1 and a first diode D1, when the voltage reaches the starting voltage of the first N-channel COMS tube Q1, the parasitic capacitor Cgd of the first N-channel COMS tube Q1 discharges through a first N-channel COMS tube Q1 and a second resistor R2, and the rising edge of the PBA switched from the DIM mode to the BRT mode current is influenced by values of a second resistor R2, a drain-gate parasitic capacitor Cds and a gate-source parasitic capacitor Cgs of the first N-channel COMS tube Q1. The parameters of the first resistor R1 and the second resistor R2 may be modified if special requirements are made to the rising edge time. When the LIGHT _ CRT control signal is at a low level, the first N-channel cmos tube Q1 is turned off, the current flowing through the PBA flows to the power ground through the third resistor R3 and the PBA lighting control circuit, and the PBA obtains the voltage divided by the PBA and the third resistor R3 and operates in the DIM mode. The third resistor R3 controls the current of the PBA working in the DIM mode, and the resistance value of the third resistor R3 is calculated according to the current, the voltage and the current of the PBA working in the BRT mode. At the moment of switching from the BRT mode to the DIM mode, the two ends of a gate-source parasitic capacitor Cgs of a first N-channel COMS tube Q1 are discharged through a second resistor R2, when the voltage reaches the turn-off voltage of a first N-channel COMS tube Q1, a drain-gate parasitic capacitor Cgd of the first N-channel COMS tube Q1 is charged through the current flowing through PBA, and the falling edge of the current switching from the BRT mode to the DIM mode of the PBA is influenced by the values of a second resistor R2, a drain-gate parasitic capacitor Cds of a first N-channel COMS tube Q1 and the gate-source parasitic capacitor Cgs. The parameters of the second resistor R2 may be modified if special requirements are made to the falling edge time.
The above description only shows the embodiments of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (1)
1. A PBA hard-line dimming control circuit compatible with PWM signals is characterized by comprising,
the hard wire dimming unit compatible with the PWM signal is provided with a BRT/DIM signal input end, a first resistor, a second resistor, a third resistor, a first diode and a first N-channel CMOS (complementary metal oxide semiconductor) tube, wherein the BRT/DIM signal input end is connected with a first end of the first resistor, a second end of the first resistor is connected with an anode of the first diode, a cathode of the first diode is respectively connected with a first end of the second resistor and a grid electrode of the first N-channel COMS tube, a drain electrode of the first N-channel COMS tube is connected with a first end of the third resistor, a second end of the second resistor is respectively connected with a second end of the third resistor and a source electrode of the first N-channel COMS tube, the first end of the third resistor is a current input end of the hard wire dimming unit, and the second end of the third resistor is a current output end of the hard wire dimming unit; and the number of the first and second groups,
The PBA lighting control unit is provided with a LIGHT _ CRT control signal input end, a fourth resistor, a fifth resistor and a second N-channel COMS tube, wherein the LIGHT _ CRT control signal input end is connected with a first end of the fourth resistor, a second end of the fourth resistor is respectively connected with a first end of the fifth resistor and a grid electrode of the second N-channel COMS tube, a second end of the fifth resistor is respectively connected with a power ground and a source electrode of the second N-channel COMS tube, and a drain electrode of the second N-channel COMS tube is connected with a current output end of the hard-wire dimming unit.
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| CN201711131405.9A CN109788610B (en) | 2017-11-15 | 2017-11-15 | PBA hard wire dimming control circuit compatible with PWM signals |
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| CN201711131405.9A CN109788610B (en) | 2017-11-15 | 2017-11-15 | PBA hard wire dimming control circuit compatible with PWM signals |
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| CN109788610B true CN109788610B (en) | 2022-07-15 |
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| CN105704874A (en) * | 2014-11-28 | 2016-06-22 | 上海航空电器有限公司 | PBA driving circuit based on PWM dimming |
| WO2016168867A1 (en) * | 2015-03-31 | 2016-10-20 | Frank Shum | Led lighting |
| CN205961506U (en) * | 2016-07-12 | 2017-02-15 | 耐思电气(嘉兴)有限公司 | LED light color temperature changes control circuit |
| CN106604479A (en) * | 2017-01-23 | 2017-04-26 | 无锡恒芯微科技有限公司 | Non-isolated LED dimming circuit with PWM and DIM dimming |
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| US8193730B2 (en) * | 2008-06-12 | 2012-06-05 | 3M Innovative Properties Company | Dimmer and illumination apparatus with amplitude ordered illumination of multiple strings of multiple color light emitting devices |
| WO2013035055A1 (en) * | 2011-09-06 | 2013-03-14 | Koninklijke Philips Electronics N.V. | Device for improving compatibility of solid state light sources with phase-cut dimmers |
| ES2627768T3 (en) * | 2014-06-17 | 2017-07-31 | Philips Lighting Holding B.V. | Dynamic control circuit |
| WO2016070150A1 (en) * | 2014-10-31 | 2016-05-06 | Sagem Avionics Llc. | System for adaptive non-linear light dimming of electro-optical devices |
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2017
- 2017-11-15 CN CN201711131405.9A patent/CN109788610B/en active Active
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|---|---|---|---|---|
| CN105704874A (en) * | 2014-11-28 | 2016-06-22 | 上海航空电器有限公司 | PBA driving circuit based on PWM dimming |
| WO2016168867A1 (en) * | 2015-03-31 | 2016-10-20 | Frank Shum | Led lighting |
| CN205961506U (en) * | 2016-07-12 | 2017-02-15 | 耐思电气(嘉兴)有限公司 | LED light color temperature changes control circuit |
| CN106604479A (en) * | 2017-01-23 | 2017-04-26 | 无锡恒芯微科技有限公司 | Non-isolated LED dimming circuit with PWM and DIM dimming |
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