CN204350359U - A kind of PBA drive circuit based on PWM light modulation - Google Patents
A kind of PBA drive circuit based on PWM light modulation Download PDFInfo
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- CN204350359U CN204350359U CN201420729122.XU CN201420729122U CN204350359U CN 204350359 U CN204350359 U CN 204350359U CN 201420729122 U CN201420729122 U CN 201420729122U CN 204350359 U CN204350359 U CN 204350359U
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- pba
- effect transistor
- field effect
- power source
- dimming power
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Abstract
The utility model provides a kind of PBA drive circuit based on PWM light modulation, comprises PBA dimming power source circuit and PBA switching circuit, it is characterized in that described PBA dimming power source circuit connects pwm signal input, exports dimming power source according to pwm signal; Described PBA switching circuit comprises the first field effect transistor, the input termination switch signal input part of described first field effect transistor, the source ground of described first field effect transistor, the drain electrode of described field effect transistor connects the negative pole of PBA, and the positive pole of PBA connects the output of described PBA dimming power source circuit.The utility model solves the problem that PBA drives jointly by dim signal and switching signal, light-dimming method realizes by regulating the duty ratio of PWM, whether the open and close of PBA are realized by the conducting controlling metal-oxide-semiconductor, solve the problem of the inner LED of PBA glimmer when closing.
Description
Technical field
The utility model relates to the design of a kind of PBA drive circuit, particularly for the PBA drive circuit based on PWM light modulation in airborne equipment.
Background technology
Band lamp push switch PBA(Illuminated Push Button Switches andAnnunciators) be indispensable a kind of electric elements in airborne equipment, be mainly used in information instruction and control inputs etc., because airborne equipment has higher requirement to signal delay and operating ambient temperature range and reliability aspect, and in circuit design, also can be subject to the constraint of the factors such as cost, so meet above-mentioned condition still have certain difficulty simultaneously, if PBA can use transistor or field effect transistor to drive, field effect transistor is voltage controlled element, and transistor is current controling element.When only allowing to obtain small electric stream from signal source, field effect transistor should be selected; And lower at signal voltage, allow again to obtain the condition of larger current from signal source, should transistor be selected.
Field-effect transistor has comparatively high input impedance and low noise and other advantages, uses field effect transistor can obtain the very inaccessible performance of general transistor, such as big current small package, low-power consumption low heat emission etc. in electronic product.But field effect transistor also exists parasitic capacitance between each pole, should be noted that when circuit design.
Present generation aircraft proposes more and more higher requirement to environmental suitability especially reliance security, so need to consider surplus design and reliability design when designing PBA and driving, this has vital meaning to guarantee flight safety aspect.
Owing to there is parasitic capacitance between each pole of field effect transistor, turning on and off in process, particularly in high frequency applications, drive circuit must can carry out quick charge/discharge to its parasitic capacitance.Therefore driving pulse should have enough steep rising and decrease speed and postpone little.Enough large instantaneous peak current can be provided when opening, make to open delay and Miller plateau time enough short, within the time required, complete the discharge and recharge to power tube input capacitance Ciss; Low-resistance discharge loop can be provided for gate charge during shutoff, improve turn-off speed.
Utility model content
The purpose of this utility model is to provide a kind of PBA drive circuit based on PWM light modulation, for PBA light modulation and switch provide solution.
To achieve these goals, the technical solution of the utility model is as follows: a kind of PBA drive circuit based on PWM light modulation, comprise PBA dimming power source circuit and PBA switching circuit, it is characterized in that described PBA dimming power source circuit connects pwm signal input, export dimming power source according to pwm signal; Described PBA switching circuit comprises the first field effect transistor, the input termination switch signal input part of described first field effect transistor, the source ground of described first field effect transistor, the drain electrode of described field effect transistor connects the negative pole of PBA, and the positive pole of PBA connects the output of described PBA dimming power source circuit.Described PBA is the anti-glimmer resistor coupled in parallel with also.Also be connected with the negative pole of diode at the output of described PBA dimming power source circuit, the plus earth of diode, described diode also with a resistor coupled in parallel.PBA dimming power source circuit comprises triode, the base stage of triode connects pwm signal input, the collector electrode of triode connects power end by the 5th resistance of series connection and the 6th resistance, the grounded emitter of triode, 5th resistance is connected with the grid of the second field effect transistor with the tie point of the 6th resistance, the source electrode of the second field effect transistor connects power end, and the drain electrode of the second field effect transistor is the output of described PBA dimming power source circuit.
Wherein the first field effect transistor adopts N-channel MOS pipe, second field effect transistor adopts P channel MOS tube, input voltage 15VDC, PWM high level voltage 5V, ON/OFF Signal signal voltage 5VDC, the drive circuit of the second field effect transistor Q2 is the dimming power source circuit of PBA as shown in the figure, and the drive circuit of the first field effect transistor Q1 is PBA switching circuit.
The utility model solves the problem that PBA drives jointly by dim signal and switching signal, dimmed light sources is produced by regulating the duty ratio of PWM, whether the open and close of PBA are realized by the conducting controlling field effect transistor, solve the problem of the inner LED of PBA glimmer when closing, and when solving PBA closedown, dimming power source low level is not the problem of 0 and negative value.
Accompanying drawing explanation
Fig. 1 is electrical schematic diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is elaborated.
As shown in Figure 1, a kind of PBA drive circuit based on PWM light modulation is made up of three partial circuits, is respectively: the adjustment of PWM dimming power source circuit, PBA switching circuit, waveform and the anti-dim light circuit of PBA.
PWM dimming power source circuit, pwm signal is by after the 3rd resistance R3 and the 4th resistance R4 dividing potential drop, high level voltage is clamped to the conduction voltage drop of 0.7V(triode), thus make triode Q3 be on off state, when triode Q3 conducting, C point voltage 7.5V(ignores the conduction voltage drop of Q3 ce), thus make the second field effect transistor (P channel MOS tube) Q2 conducting, start the parasitic capacitance C between the grid in a flash of conducting and drain electrode
gddischarged over the ground by the 6th resistance R6 and triode Q3, stop electric discharge when C point voltage is stabilized in 7.5V, discharge time can according to the parasitic capacitance C between grid and drain electrode
gdcalculate with the parameter of the 6th resistance R6, the length of discharge time determines the rising time of A point from 0V to 15V; When triode Q3 is from the moment being conducting to shutoff, 15V power supply passes through the 5th resistance R5 to the parasitic capacitance C between grid and drain electrode
gdcharge, the charging interval can according to the parasitic capacitance C between grid and drain electrode
gdcalculate with the parameter of the 5th resistance R5, the length in charging interval determines the A trailing edge time of point from 15V to 0V; If have special requirement can change the parameter of the 5th resistance R5 and the 6th resistance R6 to rising edge and trailing edge time.
PBA switching circuit, PBA switching circuit realizes mainly through the first field effect transistor (N-channel MOS pipe) Q1, the cut-in voltage V between grid and source electrode
gS (th)for 2V; the switching signal ON/OFF Signal of 5V can drive completely; first resistance R1 plays metering function, for limiting the electric current that drive singal charges to parasitic capacitance, in order to erasure signal ringing; but the first resistance R1 resistance size can affect the time that PBA opens and turns off; first resistance R1 less PBA opening time is shorter, otherwise longer, because metal-oxide-semiconductor is the electronic component of high input impedance; very easily be subject to electrostatic damage, the second resistance R2 plays the protective effect to grid.
Consider that leakage current and the PBA of metal-oxide-semiconductor will be luminous when small area analysis, adopt anti-glimmer resistance R7 and PBA in parallel, to be reduced by the leakage current of PBA, 8th resistance R8 can drag down A point voltage during when PBA closes A point waveform when low level close to 0V, consider the inductance characteristic of load backward diode D1 in parallel between load P BA and ground, so that A point voltage is lower than releasing during 0V.
Claims (6)
1. based on a PBA drive circuit for PWM light modulation, comprise PBA dimming power source circuit and PBA switching circuit, it is characterized in that described PBA dimming power source circuit connects pwm signal input, export dimming power source according to pwm signal; Described PBA switching circuit comprises the first field effect transistor, the input termination switch signal input part of described first field effect transistor, the source ground of described first field effect transistor, the drain electrode of described field effect transistor connects the negative pole of PBA, and the positive pole of PBA connects the output of described PBA dimming power source circuit.
2. a kind of PBA drive circuit based on PWM light modulation as claimed in claim 1, it is characterized in that: PBA dimming power source circuit comprises triode, the base stage of triode connects pwm signal input, the collector electrode of triode connects power end by the 5th resistance of series connection and the 6th resistance, the grounded emitter of triode, 5th resistance is connected with the grid of the second field effect transistor with the tie point of the 6th resistance, the source electrode of the second field effect transistor connects power end, and the drain electrode of the second field effect transistor is the output of described PBA dimming power source circuit.
3. a kind of PBA drive circuit based on PWM light modulation as claimed in claim 2, is characterized in that: the first field effect transistor adopts N-channel MOS pipe, and the second field effect transistor adopts P channel MOS tube.
4. a kind of PBA drive circuit based on PWM light modulation as claimed in claim 1, is characterized in that: described PBA is the anti-glimmer resistor coupled in parallel with also.
5. a kind of PBA drive circuit based on PWM light modulation as claimed in claim 1, is characterized in that: between the output and ground of described PBA dimming power source circuit, be connected with a resistance.
6. a kind of PBA drive circuit based on PWM light modulation as claimed in claim 1, is characterized in that: be also connected with the negative pole of diode at the output of described PBA dimming power source circuit, the plus earth of diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420729122.XU CN204350359U (en) | 2014-11-28 | 2014-11-28 | A kind of PBA drive circuit based on PWM light modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420729122.XU CN204350359U (en) | 2014-11-28 | 2014-11-28 | A kind of PBA drive circuit based on PWM light modulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204350359U true CN204350359U (en) | 2015-05-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420729122.XU Expired - Fee Related CN204350359U (en) | 2014-11-28 | 2014-11-28 | A kind of PBA drive circuit based on PWM light modulation |
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| CN (1) | CN204350359U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322936A (en) * | 2015-12-02 | 2016-02-10 | 上海航空电器有限公司 | PBA switch circuit with insulation blocking function |
-
2014
- 2014-11-28 CN CN201420729122.XU patent/CN204350359U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322936A (en) * | 2015-12-02 | 2016-02-10 | 上海航空电器有限公司 | PBA switch circuit with insulation blocking function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 Termination date: 20211128 |