CN109548260A - A kind of complex function pin system - Google Patents
A kind of complex function pin system Download PDFInfo
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- CN109548260A CN109548260A CN201910021824.XA CN201910021824A CN109548260A CN 109548260 A CN109548260 A CN 109548260A CN 201910021824 A CN201910021824 A CN 201910021824A CN 109548260 A CN109548260 A CN 109548260A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
Abstract
The present invention relates to a kind of complex function pin systems, the pin system drives the exchange electro-detection of emergency light intelligent management chip, charged state instruction driving, main electricity condition instruction driving, indicating fault, the function of backup battery voltage detection, emergency BOOST DC/DC output detection, the integration of pin function multiplexing is carried out by timing control；The pin system includes the first compound pin, the second compound pin and the compound pin of third, the first compound pin is integrated with input ac voltage detection, key switch detection and the driving of the first indicator light, the second compound pin is integrated with battery voltage detection, boost switching tube and the driving of third indicator light, the compound pin of third is integrated with output electric current measure and the driving of the second indicator light, and level of integrated system is greatly improved in the present invention；Reduce ic pin quantity and peripheral component quantity；Reduce system cost；Product size is reduced, there is very strong creativeness.
Description
Technical field
The present invention relates to security type emergency light technical fields, and in particular to a kind of complex function pin system.
Background technique
Emergency light, the general name of the lamps and lanterns of emergency lighting.Fire emergency system mainly includes accident emergency illumination, answers
Escape vent mark and indicator light are in the case of fire after normal illumination dump, and guidance trapped person evacuation or expansion are gone out
Fiery rescue action and be arranged.But found in daily inspection, unit fire emergency lamps type selecting, install and used
There is many problems in journey.Therefore, emergency lighting system power supply control method, the mode of connection are reasonably selected, daily dimension is carried out
Nurse makees, and directly influences the performance of fire emergency systemic effect.In daily life, it often to be checked, be prevented
Possible trouble.
In currently existing scheme, since the function of chip loads, so traditional N number of function has used N number of pin respectively
It realizes.Cause chip pin number to increase, and then increases the cost of manufacture of chip and the processing cost of PCB.
Summary of the invention
In view of the deficiencies of the prior art, the invention discloses a kind of complex function pin system, the present invention, which is greatly improved, is
System integrated level；Reduce ic pin quantity and peripheral component quantity；Reduce system cost；Reduce product size.
The present invention is achieved by the following technical programs:
A kind of complex function pin system, it is characterised in that: the pin system is by the friendship of emergency light intelligent management chip
Galvanic electricity detection, charged state instruction driving, main electricity condition instruction driving, indicating fault driving, backup battery voltage detection, emergency
The function of BOOSTDC/DC output detection, the integration of pin function multiplexing is carried out by timing control；The pin system includes
First compound pin, the second compound pin and the compound pin of third, the first compound pin are integrated with input ac voltage inspection
It surveys, key switch detection and the driving of the first indicator light, the second compound pin are integrated with battery voltage detection, boost switch
Pipe and the driving of third indicator light, the compound pin of third are integrated with output electric current measure and the driving of the second indicator light.
Preferably, when the input ac voltage detection works normally, pwm signal is low level, and M5 cut-off, indicator light is most
Low-voltage is greater than the threshold voltage of M1, and the grid of M1 and drain electrode are shorted, and the drain voltage of the M1 is clamped at Vth, the Vth
It is the threshold voltage of this pipe of M1；Input ac voltage V passes through after resistance R, and the electric current for flowing through M1 is (Vin-Vth)/R,
That is the size of input ac voltage signal, after the Current amplifier of two-stage, the electric current for flowing through resistance R2 is N1*N2* (Vin-
Vth)/R, it is N2:1, comparator that the breadth length ratio of M2 and M1, which is the breadth length ratio of N1:1, M4 and M3, in input ac voltage detection
The input ac voltage signal of comp1 is Vin* (R2/R) * (N1*N2).
Preferably, it in key switch detection, when key switch is pressed by artificial, closes the switch, comparator comp2
Input ac voltage close to 0V, wherein the reference voltage vref2 of comparator comp2 is lower than the field cut-in voltage of M1, normally
When work, key switch cut-off, the input ac voltage of comp2 is clamped at the threshold voltage vt h of M1, comparator
The output voltage of comp2 is high level.After key switch is pressed, the input ac voltage of comparator comp2 is less than
The output voltage of vref2, comp2 are overturn, and the output signal of comp2 is by providing key useful signal after time delay module 2.
Preferably, the electric current of the first indicator light driving is generated by constant-current source, is controlled by switching tube M7, pwm signal is
When high level, electric current is flowed out by switching tube M7, and is dragged down the grid of M1 and M2 by M5, and two pipes of M1, M2 are cut
Only, indicator light drives current through indicator light, and when pwm is low level, indicator light driving current is disconnected by M7, M1, M2,
The current sampling circuit of R3, R4 composition works normally.
Preferably, in the battery voltage detection, when battery is under charged state, when charging to battery, charge letter
It number is high level, switching tube M2 and M3 conducting consist of two parts to the charging current of battery, are I1 and I2 respectively, wherein I1
Through overcharge current indicator light, the voltage of V1 is equal to cell voltage Vbat, by comparator Comp_OC, by V1 voltage and one
Reference voltage compares, and obtains overcharging signal, and when cell voltage is higher than overcharge_vref, the output of comparator is turned over
Switch to high level, indicate battery charged end, the switching tube cut-off of I2, charging indicator light extinguish at this time.
Preferably, in the battery voltage detection, when battery is under discharge condition, when starting emergency lighting, I1 and
Switching tube M2, M3 on I2 charge circuit is all in off state, and inductance LX is in switch-turn-ON states, switch state at this time
It is determined by switching tube M1, inductance at this moment is equal to the energy storage component in Switching Power Supply, and by the operating mode of boost, comes
Output voltage is obtained, the voltage of V2 is equal to cell voltage, the voltage signal of V2 is sent into the input terminal of comparator comp_OD, with
One reference voltage compares, when cell voltage is lower than reference voltage, the output switching activity of comparator, and output signal OD,
It indicates cell voltage and is less than Cross prevention voltage, stop boost work.
Preferably, the electric current of the second indicator light driving is generated by constant-current source I1, is controlled by switching tube M3, SW signal is
When high level, electric current is flowed out by switching tube M3, and in addition to the electric current of small scale flows through resistance R, the electric current of outflow flows
Through indicator light, when SW is low level, indicator light driving current is disconnected by M3, this period indicator light is without driving, when SW frequency
When rate is higher than resolution of eye, indicator light is driven with pulse current, and indicator light is bright.
Preferably, in the output electric current measure, SW pulse signal is by FB pin time-sharing multiplexing, in SW high level, pipe
Foot carries out signal holding to output electric current measure signal at this time for driving indicator light, in SW low level for exporting electric current
The sampling input for detecting signal, when SW is low level, by primary non-overlapping processing, so that output electric current measure signal is adopted
Do not overlap mutually part dynamically between sample input enable signal and indicator light driving signal.
Preferably, in the compound pin of the third, within the effective output electric current measure signal sampling period, emergency lighting
Lamp driving current flows through the voltage drop generated on resistance RS and is sampled the positive input mouth for being input to error amplifier, in error
Under the action of amplifier, the voltage difference sampled between the voltage of input and the reference voltage base of negative input mouth is amplified,
Using Δ D-module, the pulsewidth that output current error is converted into pulse-width signal is increased and decreased into stepping-in amount, by addition module,
So that pwm signal dutyfactor design value D is superimposed with the pwm signal dutyfactor incrementss Δ D of feedback loop generation, ring is eventually formed
Constant output current needed under the stable state of road.
The invention has the benefit that
The chip of present invention application this technology meets newest security type national standard and is patrolled for technology itself by inside
The setting collected, this technology are widely used in the integration such as stateful instruction, battery charging management, exchange electro-detection, emergency source DC/DC
The system of correlation function, is greatly improved level of integrated system；Reduce ic pin quantity and peripheral component quantity；It reduces
System cost；Reduce product size.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the functional block diagram of the first compound pin；
Fig. 2 is the circuit diagram of the first compound pin；
Fig. 3 is the functional block diagram of the second compound pin；
Fig. 4 is the circuit diagram of the second compound pin；
Fig. 5 is the functional block diagram of the compound pin of third；
Fig. 6 is the circuit diagram of the compound pin of third；
Fig. 7 is input ac voltage detection circuit schematic diagram；
Fig. 8 is key switch detection circuit schematic diagram；
Fig. 9 is the first drive circuit of indicator schematic diagram；
Figure 10 is output current detection circuit schematic diagram；
Figure 11 is the second drive circuit of indicator schematic diagram.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Embodiment 1
A kind of complex function pin system, the pin system by the exchange electro-detection of emergency light intelligent management chip, fill
Electricity condition instruction driving, main electricity condition instruction driving, indicating fault driving, backup battery voltage detection, emergency BOOSTDC/DC
The function of exporting detection carries out the integration of pin function multiplexing by timing control；The pin system includes the first multiple tube
Foot, the second compound pin and the compound pin of third, the first compound pin as depicted in figs. 1 and 2 are integrated with input ac voltage
Detection, key switch detection and the driving of the first indicator light, the second compound pin as shown in Figure 3 and Figure 4 are integrated with cell voltage
Detection, boost switching tube and the driving of third indicator light, the compound pin of third as shown in Figure 5 and Figure 6 are integrated with output electric current inspection
It surveys and the second indicator light drives.
The present invention is by the exchange electro-detection of security type emergency light intelligent management chip, charged state instruction driving, main electricity
State instruction driving, indicating fault driving, backup battery voltage detection, emergency BOOST DC/DC output detection etc. respectively seem nothing
The function of pass carries out the Integration Design of pin function multiplexing by timing control.
Wherein, malfunction indicator lamp is driven and is exported by this patent, tests key-press input, three functions such as exchange electro-detection input
It is integrated into a pin, is known alternating-current detection signal and key-press input signal using stabilization filtering technique and low frequency filtering technology
It does not come out, by time-sharing multiplexing technology, malfunction indicator lamp driving output is a little detected, at key-press input function timesharing with exchanging
Reason.
Third indicator light is driven and is multiplexed with BOOST DC/DC ring feedback end of meeting an urgent need, in the requirement logic of system function,
The driving of third indicator light will not act on simultaneously with emergency BOOST DC/DC ring feedback end, that is, in the case where having charged state, emergency
BOOST DC/DC ring feedback will not work, meet an urgent need BOOST DC/DC ring feedback operation when, system stop charged state.
Backup battery voltage detection input mouth and the multiplexing of main electricity condition drive output mouth, by time-sharing multiplexing technology,
Backup battery voltage detection function and the driving output of main electricity condition indicator light are separated in the time domain and are accomplished non-overlapping coincidence,
Ensure one pin of this Papillary but does not interfere with each other.The driving current of main electricity condition indicator light can also be as reserve battery
Electric flux is mended, accomplishes energy regenerating.
Embodiment 2
Input ac voltage detection circuit as shown in Figure 7, when normal work, pwm signal is low level, M5 cut-off.Together
When, since indicator light needs the minimum voltage of work to be greater than the threshold voltage of M1, the grid of M1 and drain electrode are shorted, in this way, M1
Drain voltage is just clamped at Vth, and Vth is exactly the threshold voltage of this pipe of M1.So input ac voltage V passes through resistance R
Later, the electric current for flowing through M1 is (Vin-Vth)/R, this current signal has just reflected the size of input ac voltage signal.
After the Current amplifier of two-stage, the electric current for flowing through resistance R2 is N1*N2* (Vin-Vth)/R.Wherein, the width of M2 and M1 is long
It is N2:1 than the breadth length ratio for N1:1, M4 and M3.In this way, the input ac voltage signal of comparator comp1 is exactly Vin* (R2/
R) in * (N1*N2) practical application, since Vin is far longer than Vth, so having ignored Vth in calculating.When the input of comparator
When alternating voltage is more than the benchmark Vref1 of its inner setting, the output switching activity of comparator.In this manner it is possible to judge defeated
When under-voltage enter alternating voltage.
Key switch detection circuit as shown in Figure 8 closes the switch, due to key when key switch is pressed by artificial
The conduction impedance of switch is far smaller than resistance R, so the input ac voltage of comparator comp2 is close to 0V.Wherein, comparator
The reference voltage vref2 of comp2 is positive, and also close to 0V.When normal work, key switch cut-off, the input of comp2
Alternating voltage is clamped at the threshold voltage vt h of M1.The output voltage of comparator comp2 is high level.When key switch is pressed
After lower, the input ac voltage of comparator comp2 is less than vref2, overturns so as to cause the output voltage of comp2.In order to effective
Manual key is eliminated in the burr for pressing switching moments generation, the output signal of comp2 by after time delay module 2, provide by
Key useful signal.
The driving current of first drive circuit of indicator as shown in Figure 9, indicator light is generated by a constant-current source.And by
One switching tube M7 is controlled.Pwm signal be high level when, electric current is flowed out by switching tube M7, and by M5 by M1 with
The grid of M2 drags down.In this way, two pipe cut-offs of M1, M2, indicator light driving current can pass through indicator light completely.Work as pwm
When being low level, indicator light driving current is disconnected by M7, M1, M2, R3, and the current sampling module of R4 composition can normal work
Make.When pwm is sufficiently high frequency, indicator light is equivalent to the electric current of a pwm and drives, effect seen by person, just
It is indicator light always bright.
Embodiment 3
The compound pin of as shown in Figure 3 and Figure 4 second:
1. battery is under charged state, the working principle of current detection section:
Fig. 4 is a specific implementation circuit diagram of input ac voltage detection.When to battery charging, charge signal
For high level, switching tube M2 and M3 conducting.At this point, the charging current to battery consists of two parts, it is I1 and I2 respectively.Wherein
I1 is lighted through overcharge current indicator light, and by indicator light.Since inductance LX is equivalent to a conducting wire under DC case, because
This, the voltage of V1 is equal to cell voltage Vbat.Also, by comparator Comp_OC, by V1 voltage and a reference voltage ratio
Compared with to obtain overcharging signal.When cell voltage is higher than overcharge-vref, the output switching activity of comparator is height
Level.Indicate battery charged end.The switching tube cut-off of I2, charging indicator light extinguish at this time.In some cases, M2
Ended, then the current path of I1 is also ended.In other application, M2 is switched to pwm state by state, then I2
Electric current will also become the electric current of pwm.
2. battery is under discharge condition, the working principle of current detection section:
When starting emergency lighting, switching tube M2 on I1 and I2 charge circuit, M3 is all in off state.At this point, electric
Sense LX is in switch-turn-ON states, and switch state is determined by switching tube M1.At this moment inductance is equal to the energy storage in Switching Power Supply
Component, and by the operating mode of boost, to obtain output voltage.Also, since I2 is equal to 0, charging indicator light and resistance
The equal no current of R passes through, and the voltage of V2 is equal to cell voltage.The voltage signal of V2 is sent into the input terminal of comparator comp_OD,
Compared with a reference voltage, when cell voltage is lower than reference voltage, the output switching activity of comparator, output signal is
OD, mark cell voltage are less than Cross prevention voltage, should stop boost work at this time.
Embodiment 4
It as shown in figure 11, is a specific implementation circuit diagram of the second indicator light driving.
The driving current of indicator light is generated by a constant-current source I1.And it is controlled by a switching tube M3.SW signal is
When high level, electric current is flowed out by switching tube M3, and in addition to the electric current of small scale flows through resistance R, the electric current of outflow is main
Flow through indicator light.When SW is low level, indicator light driving current is disconnected by M3, this period indicator light is without driving.Work as SW
When frequency is higher than resolution of eye, indicator light is equivalent to the pulse current of certain pulsewidth and drives, and human eye is seen
Effect, be exactly indicator light always bright.
As shown in Figure 10, SW pulse signal is by FB pin time-sharing multiplexing, and in SW high level, pin is for driving instruction
Lamp carries out signal holding to output electric current measure signal at this time, the sampling in SW low level for output electric current measure signal
Input.When SW is low level, by primary non-overlapping processing, so that the sampling of output electric current measure signal inputs enable signal
Do not overlap mutually part dynamically between indicator light driving signal.
Within the effective output electric current measure signal sampling period, emergency light driving current flows through to be generated on resistance RS
Voltage drop sample input under the action of error amplifier by the positive input mouth for being input to error amplifier is sampled
Voltage difference between voltage and the reference voltage base of negative input mouth is amplified greatly.Using Δ D-module, electric current will be exported
Error is converted into the pulsewidth increase and decrease stepping-in amount of pulse-width signal.By addition module, so that pwm signal dutyfactor design value D
It is superimposed with the pwm signal dutyfactor incrementss Δ D of feedback loop generation, it is constant defeated needed for eventually forming under loop stability state
Electric current out.Under special circumstances, for example indicator light is charging indicator light.Because charged state and emergency starting state are two kinds non-
Overlapping state, that is to say, that both states will not occur simultaneously.Under this special case, the input of output electric current measure signal is not
Need sampling and keep module S/H.
The present invention is by the exchange electro-detection of security type emergency light intelligent management chip, charged state instruction driving, main electricity
State instruction driving, indicating fault driving, backup battery voltage detection, emergency BOOST DC/DC output detection etc. respectively seem nothing
The function of pass carries out the Integration Design of pin function multiplexing by timing control.Wherein, this patent drives malfunction indicator lamp
Key-press input is tested in output, and three functions such as exchange electro-detection input are integrated into a pin, using stabilization filtering technique, and
Low frequency filtering technology comes out alternating-current detection signal and key-press input signal identification, by time-sharing multiplexing technology, by indicating fault
Lamp driving exports and exchanges a little detection, key-press input function time-division processing；Third indicator light is driven and the BOOST DC/DC that meets an urgent need
The multiplexing of ring feedback end, in the requirement logic of system function, the driving of third indicator light and emergency BOOST DC/DC ring feedback end are not
It can act on simultaneously, that is, in the case where having charged state, emergency BOOST DC/DC ring feedback will not work, and meet an urgent need BOOST DC/DC
When ring feedback operation, system stops charged state；Backup battery voltage detection input mouth and main electricity condition drive output mouth
Multiplexing is exported backup battery voltage detection function and the driving of main electricity condition indicator light in the time domain by time-sharing multiplexing technology
It separates and accomplishes non-overlapping coincidence, it is ensured that one pin of this Papillary but do not interfere with each other.The drive of main electricity condition indicator light
Streaming current can also accomplish energy regenerating as the benefit electric flux of reserve battery.Level of integrated system is greatly improved；Reduce integrated circuit
Number of pin and peripheral component quantity；Reduce system cost；Reduce product size.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of complex function pin system, it is characterised in that: the pin system is by the exchange of emergency light intelligent management chip
Electro-detection, charged state instruction driving, main electricity condition instruction driving, indicating fault driving, backup battery voltage detection, emergency
The function of BOOST DC/DC output constant current current detecting carries out the integration of pin function multiplexing by timing control；The pin
System includes the first compound pin, the second compound pin and the compound pin of third, and the first compound pin is integrated with input and hands over
Flow voltage detecting, key switch detection and the first indicator light driving, the second compound pin be integrated with battery voltage detection,
Boost switching tube and the driving of third indicator light, the compound pin of third is integrated with output electric current measure and the second indicator light drives
It is dynamic.
2. a kind of complex function pin system according to claim 1, it is characterised in that: the input ac voltage detection
When normal work, pwm signal is low level, M5 cut-off, threshold voltage of the indicator light minimum voltage greater than M1, the grid of M1 and leakage
Extremely short to connect, the drain voltage of the M1 is clamped at Vth, and the Vth is the threshold voltage of this pipe of M1；Input ac voltage
V passes through after resistance R, and the electric current for flowing through M1 is (Vin-Vth)/R, i.e. the size of input ac voltage signal, by two-stage
After Current amplifier, the electric current for flowing through resistance R2 is N1*N2* (Vin-Vth)/R, M2 and M1 in the input ac voltage detection
Breadth length ratio be the breadth length ratio of N1:1, M4 and M3 be N2:1, the input ac voltage signal of comparator comp1 is Vin* (R2/
R)*(N1*N2)。
3. a kind of complex function pin system according to claim 1, it is characterised in that: in the key switch detection,
It when key switch is pressed by artificial, closes the switch, the input ac voltage of comparator comp2 is close to 0V, wherein comparator
The reference voltage vref2 of comp2 is lower than the field cut-in voltage of M1, and when normal work, key switch cut-off, comp2's is defeated
Enter the threshold voltage vt h that alternating voltage is clamped at M1, the output voltage of comparator comp2 is high level, when key switch quilt
After pressing, the input ac voltage of comparator comp2 is less than vref2, and the output voltage of comp2 is overturn, the output signal of comp2
After time delay module 2, key useful signal is provided.
4. a kind of complex function pin system according to claim 1, it is characterised in that: the first indicator light driving
Electric current is generated by constant-current source, is controlled by switching tube M7, and when pwm signal is high level, electric current is flowed out by switching tube M7, and
The grid of M1 and M2 are dragged down by M5, two pipe cut-offs of M1, M2, indicator light drives current through indicator light, when pwm is low
When level, indicator light driving current is disconnected by M7, M1, M2, R3, and the current sampling circuit of R4 composition works normally.
5. a kind of complex function pin system according to claim 1, it is characterised in that: in the battery voltage detection,
When battery is under charged state, when charging to battery, charge signal is high level, switching tube M2 and M3 conducting, to battery
Charging current consist of two parts, be I1 and I2 respectively, wherein I1 is equal to battery through overcharge current indicator light, the voltage of V1
Voltage Vbat by V1 voltage compared with a reference voltage, is obtained overcharging signal, works as cell voltage by comparator Comp_OC
When higher than overcharge_vref, the output switching activity of comparator is high level, indicates battery charged end, at this time
The switching tube of I2 ends, and charging indicator light extinguishes.
6. a kind of complex function pin system according to claim 5, it is characterised in that: in the battery voltage detection,
When battery is under discharge condition, when starting emergency lighting, switching tube M2 on I1 and I2 charge circuit, M3 is all in cut-off
State, inductance LX is in switch-turn-ON states at this time, and switch state is determined by switching tube M1, and inductance at this moment is equal to switch electricity
Energy storage component in source, and by the operating mode of boost, to obtain output voltage, the voltage of V2 is equal to cell voltage, will
The voltage signal of V2 is sent into the input terminal of comparator comp_OD, compared with a reference voltage, when cell voltage is lower than benchmark electricity
When pressure, the output switching activity of comparator, output signal OD, mark cell voltage is less than Cross prevention voltage, stopping boost
Work.
7. a kind of complex function pin system according to claim 1, it is characterised in that: the second indicator light driving
Electric current is generated by constant-current source I1, is controlled by switching tube M3, and when SW signal is high level, electric current is flowed out by switching tube M3,
In addition to the electric current of small scale flows through resistance R, the electric current of outflow flows through indicator light, when SW is low level, indicator light
Driving current is disconnected by M3, this period indicator light is without driving, when SW frequency is higher than resolution of eye, indicator light pulse
Electric current driving, indicator light are bright.
8. a kind of complex function pin system according to claim 1, it is characterised in that: in the output electric current measure,
SW pulse signal is by FB pin time-sharing multiplexing, and in SW high level, pin is for driving indicator light, at this time to output electric current measure
Signal carries out signal holding, inputs in SW low level for the sampling of output electric current measure signal, when SW is low level, warp
Primary non-overlapping processing is crossed, so that not having between the sampling input enable signal and indicator light driving signal of output electric current measure signal
There is dynamic to overlap mutually part.
9. a kind of complex function pin system according to claim 1, it is characterised in that: in the compound pin of third,
Within the effective output electric current measure signal sampling period, emergency light driving current flows through the voltage drop generated on resistance RS
It is input to the positive input mouth of error amplifier by sampling, under the action of error amplifier, samples the voltage of input and bears
It is amplified to the voltage difference between the reference voltage base of input port, using Δ D-module, converts output current error to
The pulsewidth of pulse-width signal increases and decreases stepping-in amount, by addition module, so that pwm signal dutyfactor design value D is superimposed with feedback
The pwm signal dutyfactor incrementss Δ D that circuit generates, the constant output current needed for eventually forming under loop stability state.
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| CN110602835A (en) * | 2019-10-17 | 2019-12-20 | 上海芯荃微电子科技有限公司 | Circuit and method for controlling charging of emergency lighting lamp by switch |
| CN112531818A (en) * | 2020-11-20 | 2021-03-19 | 芜湖华沅微电子有限公司 | Ultra-compact four-string lithium battery protection chip and peripheral circuit |
| CN112953354A (en) * | 2021-02-23 | 2021-06-11 | 绍兴光大芯业微电子有限公司 | Circuit structure for realizing multiplexing of fault indication pin and reset function pin |
| CN117715266A (en) * | 2024-02-06 | 2024-03-15 | 深圳市思远半导体有限公司 | Port multiplexing circuit, control chip and control system |
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2019
- 2019-01-10 CN CN201910021824.XA patent/CN109548260A/en not_active Withdrawn
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110190841A (en) * | 2019-06-06 | 2019-08-30 | 深圳市兆威机电股份有限公司 | I/O port multiplexing control circuit and electronic equipment |
| CN110190841B (en) * | 2019-06-06 | 2023-08-01 | 深圳市兆威机电股份有限公司 | IO port multiplexing control circuit and electronic equipment |
| CN110602835A (en) * | 2019-10-17 | 2019-12-20 | 上海芯荃微电子科技有限公司 | Circuit and method for controlling charging of emergency lighting lamp by switch |
| CN112531818A (en) * | 2020-11-20 | 2021-03-19 | 芜湖华沅微电子有限公司 | Ultra-compact four-string lithium battery protection chip and peripheral circuit |
| CN112531818B (en) * | 2020-11-20 | 2023-06-16 | 芜湖华沅微电子有限公司 | Ultra-compact four-string lithium battery protection chip and peripheral circuit |
| CN112953354A (en) * | 2021-02-23 | 2021-06-11 | 绍兴光大芯业微电子有限公司 | Circuit structure for realizing multiplexing of fault indication pin and reset function pin |
| CN112953354B (en) * | 2021-02-23 | 2023-03-24 | 绍兴光大芯业微电子有限公司 | Circuit structure for realizing multiplexing of fault indication pin and reset function pin |
| CN117715266A (en) * | 2024-02-06 | 2024-03-15 | 深圳市思远半导体有限公司 | Port multiplexing circuit, control chip and control system |
| CN117715266B (en) * | 2024-02-06 | 2024-04-12 | 深圳市思远半导体有限公司 | Port multiplexing circuit, control chip and control system |
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Application publication date: 20190329 |