CN109379805A - Signal integration circuit and method and signal monitoring circuit and method - Google Patents
Signal integration circuit and method and signal monitoring circuit and method Download PDFInfo
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- CN109379805A CN109379805A CN201811205131.8A CN201811205131A CN109379805A CN 109379805 A CN109379805 A CN 109379805A CN 201811205131 A CN201811205131 A CN 201811205131A CN 109379805 A CN109379805 A CN 109379805A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 44
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- 238000005070 sampling Methods 0.000 claims description 70
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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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The present invention provides a kind of signal integration circuit, the signal monitoring circuit including the signal integration circuit, signal integration method and the signal monitoring methods for using the signal integration method.The signal integration circuit includes the first sample circuit, the second sample circuit, first switch switching element, second switch switching element and pulse width modulated driving signal source, and two analog signal groups are combined into composite signal by the turn-on and turn-off that pulse width modulated driving signal source is used to control the first and second switchings element.The signal monitoring circuit includes the signal integration circuit, and the micro-control unit detected for receiving the composite signal.Two kinds of analog signal groups are combined into composite signal and transmitted together by the present invention, save the connectivity port number needed in transmission, are conducive to reduce product size.Meanwhile the detection port number of micro-control unit is saved, reduce micro-control unit cost.The present invention is especially suitable for LED product output voltage and electric current be monitored.
Description
Technical field
The present invention relates to analog signal combination of transmitted technical field, especially a kind of signal integration circuit including the signal
Signal monitoring circuit, signal integration method and the signal monitoring method using the signal integration method of integrated circuit.
Background technique
Light emitting diode (Light Emitting Diode, LED) product is just more and more intelligent.For many LED intelligence
Energy product, needs to monitor in real time the voltage and current of LED, to grasp the working condition of LED in real time and to adjust accordingly.
LED voltage and current detection mode conventional at present is as follows: by two lines by LED voltage signal collected and
Current signal is respectively transmitted to respective connectivity port on adapter, is then respectively transmitted to micro-control from respective connectivity port again
Respective detection port on unit (Microcontroller Unit, MCU) processed, by MCU after testing, conversion, obtain LED's
Voltage value and current value.Since voltage and current signals point two lines are respectively transmitted, then need to be equipped on adapter and MCU
Two connectivity ports and two detection ports, this adds somewhat to the size of product and the cost of MCU, is unable to satisfy production
The requirement that product micromation and cost reduce.
Summary of the invention
In view of the above problems, it proposes on the present invention overcomes the above problem or at least be partially solved in order to provide one kind
State signal integration circuit, signal monitoring circuit, signal integration method and the signal monitoring method of problem.
One side according to an embodiment of the present invention provides a kind of signal integration circuit, comprising:
First sample circuit, for sampling to the first analog signal, output has in the first predetermined voltage range
First voltage the first sampled signal；
Second sample circuit, for sampling to the second analog signal, output has in the second predetermined voltage range
Second voltage the second sampled signal, second predetermined voltage range do not overlap with first predetermined voltage range；
First switch switching element has input, output end and control terminal, and the first switch switching element
Input terminal is connect with the output of first sample circuit；
Second switch switching element has input, output end and control terminal, and the second switch switching element
Input terminal is connect with the output of second sample circuit, the output end of the second switch switching element and the first switch
The output end of switching element connects；And
Pulse width modulation (PWM) source driving signal, respectively with the control terminal of the first switch switching element and described
The control terminal of two switching elements connects, for exporting a PWM drive signal with specified waveform, to control described first
The turn-on and turn-off of switching element and the second switch switching element；Wherein, in the control of the PWM drive signal
Under, the conducting of any one of the first switch switching element and the second switch switching element, then another one turns off, thus
The first switch switching element and the second switch switching element timesharing is set to export first sampled signal and described the
First sampled signal and the second sampled signal group are combined into corresponding to the specified waveform by two sampled signals
Square waveform composite signal.
Optionally, first analog signal is voltage signal, and second analog signal is current signal.
Optionally, the first switch switching element and the second switch switching element are MOS fields
Effect transistor MOSFET or silicon controlled rectifier (SCR) SCR.
Optionally, one in the first switch switching element and the second switch switching element is N-type metal oxygen
Compound semiconductor field effect transistor NMOSFET, the other is P type metal oxide semiconductor field effect transistor PMOSFET.
Optionally, first predetermined voltage range is 3-5V, and second predetermined voltage range is 0-2V.
According to another aspect of an embodiment of the present invention, a kind of signal monitoring circuit is additionally provided, for load circuit
First analog signal and the second analog signal are monitored, and the signal monitoring circuit includes:
Above described in any item signal integration circuits, connect with the load circuit, for the load circuit
The first analog signal and the second analog signal sampled and export composite signal；And
Micro-control unit connect with the output of the signal integration circuit, for receiving the composite signal, reads respectively
The upper voltage magnitude of the waveform of the composite signal and lower voltage magnitude, judge the upper voltage magnitude and the lower voltage magnitude
Each of be the value of first sampled signal or the value of second sampled signal respectively, and restored according to specified rule
The value of the value of first analog signal and second analog signal out.
Optionally, the micro-control unit is also used to:
By each of the upper voltage magnitude and the lower voltage magnitude respectively with first predetermined voltage range
It compares with second predetermined voltage range；
If one in the upper voltage magnitude and the lower voltage magnitude in first predetermined voltage range and
Another then judges that the voltage magnitude in first predetermined voltage range is institute in second predetermined voltage range
The value of the first sampled signal is stated, and judges that the voltage magnitude in second predetermined voltage range is the second sampling letter
Number value.
Optionally, the load circuit is Light-emitting diode LED circuit, and first analog signal is voltage signal, institute
Stating the second analog signal is current signal.
Optionally, the LED circuit includes driving circuit, and the driving circuit is connect with the micro-control unit, is used for
Driving power is provided under the control of the micro-control unit for the LED in the LED circuit；
Wherein, the PWM drive signal source is generated by the driving circuit.
Optionally, the micro-control unit is also used to:
The LED circuit is controlled according to the value of the voltage signal and the value of the current signal.
Optionally, the LED circuit is set with voltage signal operation interval and current signal operation interval；
The micro-control unit is also used to:
If the value of the voltage signal adjusts the driving of the LED circuit except the voltage signal operation interval
The output voltage of circuit, until the value of the voltage signal is in the voltage signal operation interval；
If the value of the current signal adjusts the driving of the LED circuit except the current signal operation interval
The output electric current of circuit, until the value of the current signal is in the current signal operation interval.
Another aspect according to an embodiment of the present invention additionally provides a kind of signal integration method, comprising:
By sampling convert the first analog signal to the first voltage in the first predetermined voltage range first
Sampled signal；
By sampling convert the second analog signal to the second voltage in the second predetermined voltage range second
Sampled signal, second predetermined voltage range are not overlapped with first predetermined voltage range；
It is input with first sampled signal and second sampled signal, in the pulse width that one has specified waveform
The first level section and second electrical level under the control of modulation (PWM) driving signal, in each period of the PWM drive signal
Section exports first sampled signal and second sampled signal respectively, by first sampled signal and described second
Sampled signal group is combined into the composite signal with square waveform corresponding with the specified waveform.
Optionally, first analog signal is voltage signal, and second analog signal is current signal.
Optionally, the output that first sampled signal is controlled by first switch switching element, is cut by second switch
Change the output that element controls second sampled signal；Wherein, the PWM drive signal controls the first switch switching element
With the turn-on and turn-off of the second switch switching element so that in each period of the PWM drive signal first electricity
Flat section, the first switch switching element conducting and second switch switching element shutdown, and drive and believe in the PWM
Number each period in second electrical level section, first switch switching element shutdown and the second switch switching element
Conducting.
Optionally, the first switch switching element and the second switch switching element are MOS fields
Effect transistor MOSFET or silicon controlled rectifier (SCR) SCR.
Optionally, one in the first switch switching element and the second switch switching element is N-type metal oxygen
Compound semiconductor field effect transistor NMOSFET, the other is P type metal oxide semiconductor field effect transistor PMOSFET.
Optionally, first predetermined voltage range is 3-5V, and second predetermined voltage range is 0-2V.
It is according to an embodiment of the present invention in another aspect, a kind of signal monitoring method is additionally provided, for load circuit
First analog signal and the second analog signal are monitored, comprising:
By according to above described in any item signal integration methods, by first analog signal and second mould
Quasi- signal is respectively converted into the first sampled signal and the second sampled signal, and first sampled signal and described second are sampled
Signal integration is composite signal；And
The composite signal is received, reads the upper voltage magnitude and lower voltage magnitude of the waveform of the composite signal respectively,
Judge that each of the upper voltage magnitude and the lower voltage magnitude are the value or described of first sampled signal respectively
The value of second sampled signal, and restore according to specified rule the value and second analog signal of first analog signal
Value.
Optionally, judge that each of the upper voltage magnitude and the lower voltage magnitude are first sampling respectively
The value of the value of signal or second sampled signal, comprising:
By each of the upper voltage magnitude and the lower voltage magnitude respectively with first predetermined voltage range
It compares with second predetermined voltage range；
If one in the upper voltage magnitude and the lower voltage magnitude in first predetermined voltage range and
Another then judges that the voltage magnitude in first predetermined voltage range is institute in second predetermined voltage range
The value of the first sampled signal is stated, and judges that the voltage magnitude in second predetermined voltage range is the second sampling letter
Number value.
Optionally, the load circuit is Light-emitting diode LED circuit, and first analog signal is voltage signal, institute
Stating the second analog signal is current signal.
Optionally, the LED circuit includes driving circuit；The PWM drive signal by the LED circuit driving circuit
It generates.
Optionally, the signal monitoring method further include:
The LED circuit is controlled according to the value of the voltage signal and the value of the current signal.
Optionally, the LED circuit is set with voltage signal operation interval and current signal operation interval；
The LED circuit is controlled according to the value of the voltage signal and the value of the current signal, comprising:
If the value of the voltage signal adjusts the driving of the LED circuit except the voltage signal operation interval
The output voltage of circuit, until the value of the voltage signal is in the voltage signal operation interval；
If the value of the current signal adjusts the driving of the LED circuit except the current signal operation interval
The output electric current of circuit, until the value of the current signal is in the current signal operation interval.
The technical solution that the embodiment of the present invention proposes, firstly, by the first and second sample circuits respectively to first and the
Two analog signals are sampled, and first and second sampled signals with the voltage value in different predetermined voltage ranges are exported；
Then, the first and second sampled signals are inputted into the first and second switching elements respectively, it should using PWM drive signal control
The turn-on and turn-off of first and second switching elements keep first switch switching element and second switch switching element timesharing defeated
First sampled signal and the second sampled signal out, the first sampled signal and the second sampled signal group are combined into square waveform
Composite signal, and export the composite signal to subsequent element, thus realize by two kinds of analog signal groups be combined into one it is compound
Signal is transmitted with will pass through a line, has been effectively saved the connectivity port number needed in transmission, is conducive to reduce product
Size.
Further, after receiving the composite signal by micro-control unit MCU, the waveform of the composite signal is read respectively
Upper voltage magnitude and lower voltage magnitude obtain the value of the first and second analog signals by judgement and rule reduction conversion, thus
Realize the monitoring to the first and second analog signals.Since the corresponding sampled signal group of the first and second analog signals is combined into one
A composite signal is transmitted, and MCU need to can only complete the detection of the first and second analog signals using a detection port
And monitoring, it is effectively saved the detection port number of MCU, to reduce MCU cost.The technical solution of the embodiment of the present invention is special
Suitable for the output voltage and the occasion that is monitored of electric current to LED product.
Further, it when being applied to LED circuit, can also be produced by providing the driving circuit of driving power for LED
The PWM drive signal of the first and second switching elements of raw driving, without increasing the circuit for generating PWM drive signal newly, into
One step reduces cost.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 transmits schematic diagram for the signal in LED voltage and current detecting in the prior art；
Fig. 2 shows the structural schematic diagrams of signal integration circuit according to an embodiment of the invention；
Fig. 3 shows the connection relationship diagram of the signal integration circuit of a specific embodiment according to the present invention, wherein the
One sampled signal and the second sampled signal are respectively voltage sampling signal and current sampling signal, first switch switching element and
Two switching elements are respectively NMOSFET and PMOSFET；
Fig. 4 a and Fig. 4 b respectively illustrate the voltage sampling signal and current sampling signal of signal integration circuit shown in Fig. 3
Wavy curve；
Fig. 5 shows the wavy curve of the resulting composite signal of signal integration circuit shown in Fig. 3；
Fig. 6 shows the structural schematic diagram of signal monitoring circuit according to an embodiment of the invention；
Fig. 7 is to transmit schematic diagram according to the signal in two kinds of analog signal detections of the embodiment of the present invention；
Fig. 8 shows the structural schematic diagram of signal monitoring circuit according to another embodiment of the present invention；
Fig. 9 shows the flow chart of signal integration method according to an embodiment of the invention；And
Figure 10 shows the flow chart of signal monitoring method according to an embodiment of the invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
In the prior art, conventional LED voltage and current detection mode be all point two lines respectively transmit voltage signal and
Current signal, the transmission specifically used and detection structure can be as shown in Figure 1.Referring to Fig.1 as it can be seen that LED voltage collected is believed
Number and current signal pass through the connectivity port 1 and 2 that two lines are transferred on adapter respectively, then pass through two lines respectively again
Detection port I/O-1 and the I/O-2 being transferred on MCU, so by MCU after testing, conversion, obtain LED voltage value and
Current value.Since voltage signal and current signal point two lines respectively transmit, then need to be equipped with two on adapter and MCU
Connectivity port and two detection ports, this adds somewhat to the size of product and the cost of MCU.
In order to solve the above technical problems, the embodiment of the invention provides a kind of signal integration circuits.Fig. 2 shows according to this
Invent the structural schematic diagram of the signal integration circuit of an embodiment.As shown in Fig. 2, the signal integration circuit 100 at least can wrap
Include the first sample circuit 110, the second sample circuit 120, first switch switching element 130, second switch switching element 140 and
Pulse width modulates (Pulse Width Modulation, PWM) source driving signal 150.
It now introduces between each composition of the signal integration circuit 100 of the embodiment of the present invention or the function and each section of device
Connection relationship:
First sample circuit 110, for sampling to the first analog signal, output has in the first predetermined voltage range
First sampled signal of interior first voltage.
Second sample circuit 120, for sampling to the second analog signal, output has in the second predetermined voltage range
Second sampled signal of interior second voltage, wherein the second predetermined voltage range is not overlapped with the first predetermined voltage range.
First switch switching element 130 has input terminal 131, output end 132 and control terminal 133, and first switch is cut
The input terminal 131 for changing element 130 is connect with the output of the first sample circuit 110.
Second switch switching element 140 has input terminal 141, output end 142 and control terminal 143, and second switch is cut
The input terminal 141 for changing element 140 is connect with the output of the second sample circuit 120, the output end of second switch switching element 140
142 connect with the output end 132 of first switch switching element 130.
PWM drive signal source 150 switches member with the control terminal 133 and second switch of first switch switching element 130 respectively
The control terminal 143 of part 140 connects, for exporting a PWM drive signal with specified waveform, in turn, PWM drive signal control
The turn-on and turn-off of first switch switching element 130 and second switch switching element 140；Wherein, in the control of PWM drive signal
Under, the conducting of any one of first switch switching element 130 and second switch switching element 140, then another one turns off, to make
First switch switching element 130 and 140 timesharing of second switch switching element export the first sampled signal and the second sampled signal, with
First sampled signal and the second sampled signal group are combined into the composite signal for specifying the corresponding square waveform of waveform with this.
The signal integration circuit that the embodiment of the present invention proposes, firstly, by the first and second sample circuits respectively to first
It is sampled with the second analog signal, exports the first and second sampling letters with the voltage value in different predetermined voltage ranges
Number；Then, the first and second sampled signals are inputted into the first and second switching elements respectively, using PWM drive signal control
The turn-on and turn-off for making the first and second switchings element make first switch switching element and second switch switching element point
When export the first sampled signal and the second sampled signal, the first sampled signal and the second sampled signal group are combined into rectangle
The composite signal of waveform, and the composite signal is exported to subsequent element, two kinds of analog signal groups are combined into one to realize
Composite signal is transmitted with will pass through a line, has been effectively saved the connectivity port number needed in transmission, has been conducive to reduce
Product size.
In alternative embodiment of the invention, the first analog signal and the second analog signal can be respectively voltage signal and
Current signal transmits two kinds of analog signal combinations of voltage and current to realize on a signal.
Correspondingly, voltage signal and electric current can be believed respectively using common voltage sampling circuit and current sampling circuit
It number is sampled, such as voltage sampling circuit can be constituted using two resistance of concatenation, current sampling circuit can be electric current
Sample resistance.The composition of sample circuit for being sampled to analog signal and the technology of connection are those skilled in the art institute
It is known, it does not repeat separately herein.
First switch switching element and second switch switching element mentioned above are can be according to the touching being applied to it
The polarity or size of the pressure that generates electricity and a kind of electronic component for switching between on and off states, with lesser resistance
It is anti-, to reduce the loss of signal energy.The specified waveform of PWM drive signal is the rectangular pulse waveform of variable duty ratio.?
Under the control of the PWM drive signal, the conducting of any one of first switch switching element and second switch switching element is then another
Person's shutdown.For example, the conducting of first switch switching element, then second switch switching element closes when PWM drive signal is high level
It is disconnected；When PWM drive signal is low level, the shutdown of first switch switching element, then second switch switching element is connected.Alternatively,
When PWM drive signal is low level, the conducting of first switch switching element, then second switch switching element is turned off；When PWM drives
When signal is high level, the shutdown of first switch switching element, then second switch switching element is connected.It in practical applications, can root
According to element characteristic and actual demand, the turn-on and turn-off condition of first switch switching element and second switch switching element is set.
In alternative embodiment of the invention, first switch switching element and second switch switching element can be metal oxygen
Compound semiconductor field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor,
) or silicon controlled rectifier (SCR) (Silicon Controlled Rectifier, SCR) MOSFET.
Metal Oxide Semiconductor Field Effect Transistor is that one kind can be widely used in analog circuit and digital circuit
Field effect transistor can be divided into the N-channel type that electronics occupies the majority and the P ditch that hole occupies the majority according to the polar difference of its channel
Channel type, commonly known as N-type Metal Oxide Semiconductor Field Effect Transistor (n-Channel Metal-Oxide-
Semiconductor Field-Effect Transistor, NMOSFET) and P type metal oxide semiconductor field effect transistor
It manages (p-Channel Metal-Oxide-Semiconductor Field-Effect Transistor, PMOSFET).When one
When a enough big potential differences are imposed between the grid of Metal Oxide Semiconductor Field Effect Transistor and source electrode, electric field can aoxidized
The semiconductor surface of layer lower section forms charge inducing, and at this moment just will form inversion channel (Inversion Channel).Channel
Polarity and its drain (drain) it is identical as source electrode, it is assumed that drain electrode and source electrode be N-shaped, then channel also can be N-shaped.Channel shape
Cheng Hou, Metal Oxide Semiconductor Field Effect Transistor can be connected.Metal Oxide Semiconductor Field Effect Transistor is being connected
When channel resistance it is low, and resistance when ending is almost limitless big, so being suitable as the switch of analog signal.Work as first switch
When switching element and second switch switching element use MOSFET, the grid of every MOSFET is as control terminal, source electrode and drain electrode
According to actual needs respectively as one of input terminal and output end and another one.
Silicon controlled rectifier (SCR) is also referred to as thyristor, is made of four-level semiconductor material, and there are three PN junctions, and externally there are three electricity
Pole, respectively anode, control electrode and cathode.It is a kind of device of one direction conduction, only turn-on and turn-off two states.It is logical
The outer plus forward voltage between the anode and cathode of silicon controlled rectifier (SCR) is crossed, and inputs positive triggering between control electrode and cathode
Voltage, silicon controlled rectifier (SCR) conducting.The outer plus pulsating dc voltage between the anode and cathode of silicon controlled rectifier (SCR), in voltage mistake
When zero, silicon controlled rectifier (SCR) can be turned off voluntarily.Using this turn-on and turn-off property of silicon controlled rectifier (SCR), simulation can be used as
The switch of signal.It is each silicon-controlled when first switch switching element and second switch switching element use silicon controlled rectifier (SCR)
The control electrode of rectifier is as control terminal, and cathode and anode are according to actual needs respectively as one of input terminal and output end
And another one.
In a preferred embodiment, one in first switch switching element and second switch switching element is
NMOSFET, the other is PMOSFET.
Fig. 3 shows the connection relationship diagram of the signal integration circuit of a specific embodiment according to the present invention, wherein the
One sampled signal and the second sampled signal can be respectively voltage sampling signal and current sampling signal, first switch switching element
It is respectively NMOSFET and PMOSFET with second switch switching element.Referring to shown in Fig. 3, as first switch switching element
The drain electrode of NMOSFET is connect as input terminal with voltage sampling signal, and source electrode is as output end, and grid is as control terminal and PWM
Driving signal connection.The source electrode of PMOSFET as second switch switching element is connect as input terminal with current sampling signal,
Grid is connect as control terminal with the PWM drive signal, and drain electrode is connected as output end with the output end of NMOSFET.
After the output end of NMOSFET is connected with the output end of PMOSFET, the whole output end as signal integration circuit.It needs
It is bright, the first sample circuit and the second sample circuit are not shown to simplify the explanation, in Fig. 3, those skilled in the art can be bright
, voltage sampling signal and current sampling signal, which can be, respectively to be exported by the first sample circuit and the second sample circuit.
Above mentioned voltage sampling signal and current sampling signal be by respectively to voltage signal and current signal into
Row sampling obtains, and wavy curve difference is as shown in fig. 4a and fig. 4b.Voltage is shown referring to Fig. 4 a and Fig. 4 b, Fig. 4 a to adopt
The wavy curve of sample signal, wherein X-axis indicates time (t), and Y-axis indicates the voltage value (v) of voltage sampling signal, it can be seen that
Voltage sampling signal has the constant the first voltage value in the first predetermined voltage range.Fig. 4 b shows current sampling signal
Wavy curve, wherein X-axis indicate time (t), Y-axis indicate current sampling signal voltage value (v), it can be seen that electric current is adopted
Sample signal has the constant second voltage value in the second predetermined voltage range.Second predetermined voltage range and the first default electricity
Pressure range does not overlap.In a kind of optional embodiment, adopted to improve subsequent parts to the first sampled signal and second
The resolution capability of sample signal, the first predetermined voltage range can be set as 3-5V, and the second predetermined voltage range can be set
For 0-2V.
The turn-on and turn-off of PWM drive signal control NMOSFET and PMOSFET.When PWM drive signal is high level,
NMOSFET is connected and PMOSFET is turned off, at this point, voltage sampling signal can not be led to by NMOSFET current sampling signal
Cross PMOSFET.When PWM drive signal is low level, NMOSFET is turned off and PMOSFET is connected, at this point, voltage sampling signal
It can not can pass through PMOSFET by NMOSFET current sampling signal.By this driving method, voltage sample is realized
The timesharing of signal and current sampling signal exports, so that voltage sampling signal and current sampling signal group are combined into a compound letter
Number, and the tie point of the output end from the output end and PMOSFET of NMOSFET exports the composite signal outward.The compound letter of gained
Number wavy curve it is as shown in Figure 5, wherein X-axis indicate time (t), Y-axis indicate composite signal voltage value (v), can see
Out, which has square waveform, and the upper voltage magnitude of waveform and lower voltage magnitude are believed with the voltage sample of input respectively
Number voltage value and current sampling signal voltage value it is corresponding.It should be noted that duty of the present invention to PWM drive signal
Than with no restriction.Preferably, the duty ratio of PWM drive signal can be 50%, at this point, the waveform of gained composite signal is side
Wave.
Based on the same inventive concept, the embodiment of the invention also provides a kind of signal monitoring circuits, for load circuit
The first analog signal and the second analog signal be monitored.Fig. 6 shows signal monitoring electricity according to an embodiment of the invention
The structural schematic diagram on road.As shown in fig. 6, the signal monitoring circuit 600 at least may include signal integration circuit described above
100 and micro-control unit MCU 610.
Signal integration circuit 100 is connect with the load circuit, for the first analog signal of the load circuit and second
Analog signal is sampled and exports composite signal.
Micro-control unit 610 is connect with the output of signal integration circuit 100, for receiving signal integration circuit output
Composite signal reads the upper voltage magnitude and lower voltage magnitude of the waveform of composite signal, voltage magnitude and lower electricity in judgement respectively
Each of pressure amplitude value is the value of the first sampled signal or the value of the second sampled signal respectively, and is restored according to specified rule
The value of the value of first analog signal and the second analog signal.
It should be noted that load circuit is not shown in Fig. 6 in order to simplify structure explanation.
In alternative embodiment of the invention, micro-control unit 610 be can be also used for:
Each of upper voltage magnitude and lower voltage magnitude is default electric with the first predetermined voltage range and second respectively
Pressure range compares；
If in upper voltage magnitude and lower voltage magnitude one in the first predetermined voltage range and another is second
In predetermined voltage range, then judge that the voltage magnitude in the first predetermined voltage range is the value of the first sampled signal, and sentence
The voltage magnitude in the second predetermined voltage range that breaks is the value of the second sampled signal.
Illustrate the workflow of signal monitoring circuit 600 with a specific example below.
Firstly, the first sample circuit 110 samples the voltage signal of load circuit, output has within the scope of 3-5V
First voltage (such as 4V) voltage sampling signal.Meanwhile second sample circuit 120 current signal of load circuit is carried out
Sampling exports the current sampling signal with the second voltage (such as 1V) within the scope of 0-2V.
Then, voltage sampling signal and current sampling signal first switch switching element 130 and second is inputted respectively to open
Switching element 140 is closed, 130 He of first switch switching element is driven by the PWM drive signal that PWM drive signal source 150 exports
Voltage sampling signal and current sampling signal group are combined into the composite signal with square waveform by second switch switching element 140.
Finally, micro-control unit 610 receives the composite signal, and monitor the waveform of the composite signal.When detecting rectangle
When waveform, micro-control unit 610 reads the upper voltage magnitude and lower voltage magnitude of the square waveform respectively, by them and 3-5V electricity
Pressure range and 0-2V voltage range are compared, if one in the upper voltage magnitude and lower voltage magnitude that read is in 3-5V voltage
In range and another is in 0-2V voltage range, then judges the voltage magnitude in 3-5V voltage range as voltage sample letter
Number value, voltage magnitude in 0-2V voltage range is the value of current sampling signal.In turn, micro-control unit 610 is according to
The sampling rule of one sample circuit 110 and the second sample circuit 120, restores the voltage signal sampled and current signal respectively
Value.
In a kind of specific reduction mode, it can be converted and be restored by ratio.For example, when the first sample circuit 110
Sampling rule are as follows: by adjusting voltage sample resistance, make the value of voltage sampling signal and the value of the voltage signal sampled
Ratio is 1/50 (that is, reduction ratio when the first sample circuit 110 samples voltage signal is 1/50)；Second sampling electricity
The sampling rule on road 120 are as follows: by adjusting current sampling resistor, make the value of current sampling signal and the current signal sampled
The ratio of value is 20 (that is, magnification ratio when the second sample circuit 120 samples current signal is 20), micro-control unit
610 sample the voltage magnitude for being judged as the value of voltage sampling signal divided by the first sample circuit 110 to voltage signal
When reduction ratio 1/50, obtain the value of voltage signal sampled；Also, micro-control unit 610 will be judged as electric current and adopt
Magnification ratio 20 when the voltage magnitude of the value of sample signal samples current signal divided by the second sample circuit 120, obtains
The value of the current signal sampled.
After the embodiment of the present invention receives the composite signal by micro-control unit MCU, the wave of the composite signal is read respectively
The upper voltage magnitude of shape and lower voltage magnitude obtain the value of the first and second analog signals by judgement and rule reduction conversion,
To realize the monitoring to the first and second analog signals.Due to combining the corresponding sampled signal of the first and second analog signals
It is transmitted for a composite signal, MCU only need to can complete the first and second analog signals using a detection port
Detection and monitoring, have been effectively saved the detection port number of MCU, to reduce MCU cost.
Schematic diagram is transmitted by the signal of Fig. 7, those skilled in the art are easier that skill provided in an embodiment of the present invention is illustrated
The beneficial effect of art scheme.Referring to Fig. 7 as it can be seen that passing through a line after voltage signal and current signal be combined into composite signal
It is transferred to the connectivity port 1 on adapter, the detection port I/O-1 on MCU is then transferred to by a line again, in turn
By MCU after testing, reduction, obtain voltage value and current value.Since voltage signal and current signal are combined into a signal
It is transmitted, then need to only occupy a connectivity port and MCU upper detection port on adapter.Size limitation and MCU at
In the case where this limitation, a connectivity port or MCU detection port are reduced, it will be able to effectively reduce cost.It should be noted that
Voltage signal and current signal are combined although being merely illustrated in Fig. 7, it will be appreciated by a person skilled in the art that can use
Any two kinds of analog signals substitution voltage signal herein and current signal are combined, and can equally obtain said effect.Also
It should be noted that total port number of adapter shown in fig. 7 and total port number of MCU are only illustrative, do not constitute pair
Limitation of the invention.
In alternative embodiment of the invention, load circuit can be LED circuit, and the first analog signal can be believed for voltage
Number, the second analog signal can be current signal.Herein, the first analog signal and the second analog signal can be LED electricity respectively
The voltage signal and current signal of LED in road is also possible to drive the voltage signal and current signal of output in LED circuit.This
When, referring to shown in Fig. 8, the first sample circuit 110 and the second sample circuit 120 are connect with LED circuit 620, for respectively to LED
The first analog signal and the second analog signal of circuit 620 are sampled.Micro-control unit 610 can be according to obtained first
The value of the value of analog signal and the second analog signal, the state of control display LED, and/or control LED's shines.Specifically, believe
Number monitoring circuit 600 can monitor the voltage signal and current signal of LED, wherein micro-control unit 610 can will be detected
LED voltage value and current value be sent to other equipment and shown, can also according to the voltage value of detected LED and
Current value carries out feedback control to the power supply of LED, and then controls shining for LED.
Further, still referring to shown in Fig. 8, LED circuit 620 may include driving circuit 621.Driving circuit 621 with
Micro-control unit 610 connects, for providing driving power under the control of micro-control unit 610 for the LED in LED circuit 620.
At this point, PWM drive signal source 150 can be generated by driving circuit 621.In practical applications, driving circuit 621 can be switch
Power supply, and then can be used for using caused by the driving IC (Integrated Circuit, integrated circuit) in Switching Power Supply
Switching tube (usually metal-oxide-semiconductor) in driving switch power supply carries out the pwm signal of energy conversion as PWM drive signal source 150.
The pwm signal in LED driving major loop generated by using Switching Power Supply is as the first and second switch of driving
The PWM drive signal of switching element further reduces cost without the newly-increased circuit for generating PWM drive signal.
In alternative embodiment of the invention, when load circuit is LED circuit, micro-control unit 610 be can be also used for:
The LED circuit 620 is controlled according to the value of the voltage signal of LED circuit 620 and the value of current signal.
Further, which can also be set with voltage signal operation interval and current signal operation interval.
At this point, micro-control unit 610 can be also used for:
If the value of the voltage signal of LED circuit 620 except voltage signal operation interval, adjusts the drive of LED circuit 620
The output voltage of dynamic circuit 621, until the value of the voltage signal is in voltage signal operation interval；
If the value of the current signal of LED circuit 620 except current signal operation interval, adjusts the drive of LED circuit 620
The output electric current of dynamic circuit 621, until the value of the current signal is in current signal operation interval.
Below by a specific example to micro-control unit 610 according to the value of the voltage signal of the LED circuit detected and
The value of current signal controls the LED circuit and is illustrated.
Assuming that the preset voltage signal operation interval of LED circuit 620 is 38-40V, current signal operation interval is 18-
20mA.If micro-control unit 610 is 42V by the value for the voltage signal for restoring the LED circuit 620 that operation obtains, it is higher than the electricity
The upper limit value of signal operation interval is pressed, then micro-control unit 610 reduces the driving electricity of LED circuit 620 by feedback control signal
The output voltage on road 621 (being specifically as follows Switching Power Supply), until LED circuit 620 voltage signal value in 38-40V.If
Micro-control unit 610 is 16mA by the value for the current signal for restoring the LED circuit 620 that operation obtains, and is lower than the current signal
The lower limit value of operation interval, then micro-control unit 610 increases the driving circuit 621 of LED circuit 620 by feedback control signal
The output electric current of (being specifically as follows Switching Power Supply), until LED circuit 620 current signal value in 18-20m, to protect
Hinder the normal work of LED.
Based on the same inventive concept, the embodiment of the invention also provides a kind of signal integration methods.Fig. 9 is shown according to this
Invent the flow chart of the signal integration method of an embodiment.Referring to Fig. 9, which at least be may comprise steps of
S902 to step S906.
Step S902 is converted the first analog signal to the first electricity in the first predetermined voltage range by sampling
First sampled signal of pressure.
Step S904 is converted the second analog signal to the second electricity in the second predetermined voltage range by sampling
Second sampled signal of pressure, the second predetermined voltage range are not overlapped with the first predetermined voltage range.
Step S906 is input with the first sampled signal and the second sampled signal, has the pulse of specified waveform wide one
It spends under the control of modulation (PWM) driving signal, the first level section and second electrical level area in each period of PWM drive signal
Between export the first sampled signal and the second sampled signal respectively, the first sampled signal and the second sampled signal group, which are combined into, to be had
The composite signal of square waveform corresponding with specified waveform.
Above step S902 and step S904 can be carried out simultaneously.
In alternative embodiment of the invention, the first analog signal and the second analog signal can be respectively voltage signal and
Current signal transmits two kinds of analog signal combinations of voltage and current to realize on a signal.
Correspondingly, voltage signal and electric current can be believed respectively using common voltage sampling circuit and current sampling circuit
It number is sampled, such as voltage sampling circuit can be constituted using two resistance of concatenation, current sampling circuit can be electric current
Sample resistance.It is well known to those skilled in the art by the technology that sample circuit samples analog signal, it is not another herein
It repeats.
In a kind of optional embodiment, step S906 can control the first sampled signal by first switch switching element
Output, pass through second switch switching element control the second sampled signal output.Wherein, PWM drive signal control first is opened
The turn-on and turn-off for closing switching element and second switch switching element, so that first in each period of PWM drive signal
Level section, the conducting of first switch switching element and the shutdown of second switch switching element, and in each week of PWM drive signal
Interim second electrical level section, the shutdown of first switch switching element and the conducting of second switch switching element.
First switch switching element and second switch switching element mentioned above are can be according to the touching being applied to it
The polarity or size of the pressure that generates electricity and a kind of electronic component for switching between on and off states, with lesser resistance
It is anti-, to reduce the loss of signal energy.The specified waveform of PWM drive signal is the rectangular pulse waveform of variable duty ratio.?
Under the control of the PWM drive signal, the conducting of any one of first switch switching element and second switch switching element is then another
Person's shutdown.For example, the conducting of first switch switching element, then second switch switching element closes when PWM drive signal is high level
It is disconnected；When PWM drive signal is low level, the shutdown of first switch switching element, then second switch switching element is connected.Alternatively,
When PWM drive signal is low level, the conducting of first switch switching element, then second switch switching element is turned off；When PWM drives
When signal is high level, the shutdown of first switch switching element, then second switch switching element is connected.It in practical applications, can root
According to element characteristic and actual demand, the turn-on and turn-off condition of first switch switching element and second switch switching element is set.
In a preferred embodiment of the invention, first switch switching element and second switch switching element can be metal oxygen
Compound semiconductor field effect transistor MOSFET or silicon controlled rectifier (SCR) SCR.
It is highly preferred that one in first switch switching element and second switch switching element is N-type metal oxide half
Conductor field effect transistor NMOSFET, the other is P type metal oxide semiconductor field effect transistor PMOSFET.
Working principle of the NMOSFET and PMOSFET under PWM drive signal control is as described above.
Mentioned above, the second predetermined voltage range is not overlapped with the first predetermined voltage range.It is subsequent from multiple in order to improve
The ability that the first sampled signal and the second sampled signal are differentiated in signal is closed, in a kind of optional embodiment, first is default
Voltage range can be set as 3-5V, and the second predetermined voltage range can be set as 0-2V.
Based on the same inventive concept, the embodiment of the invention also provides a kind of signal monitoring methods, for load circuit
The first analog signal and the second analog signal be monitored.Figure 10 shows signal monitoring side according to an embodiment of the invention
The flow chart of method.Referring to Figure 10, the step of which at least may include signal integration method described above
S902 to step S906 can also include step S908.
By step S902 to step S906, the first analog signal of load circuit and the second analog signal are converted respectively
For the first sampled signal and the second sampled signal, and the first sampled signal and the second sampled signal are integrated into composite signal.
In step S908, the composite signal is received, reads the upper voltage magnitude and lower electricity of the waveform of the composite signal respectively
Pressure amplitude value, each of voltage magnitude and lower voltage magnitude are the value or the second sampling letter of the first sampled signal respectively in judgement
Number value, and the value of the first analog signal and the value of the second analog signal are restored according to specified rule.
Upper each of voltage magnitude and lower voltage magnitude are judged in alternative embodiment of the invention, in step S908
It is the value of the first sampled signal or the value of the second sampled signal respectively, may include:
Each of upper voltage magnitude and lower voltage magnitude is default electric with the first predetermined voltage range and second respectively
Pressure range compares；
If in upper voltage magnitude and lower voltage magnitude one in the first predetermined voltage range and another is second
In predetermined voltage range, then judge that the voltage magnitude in the first predetermined voltage range is the value of the first sampled signal, and sentence
The voltage magnitude in the second predetermined voltage range that breaks is the value of the second sampled signal.
In above step S908, according to sampling rule, the first analog signal and the second analog signal sampled is restored
Respective value.In a kind of specific reduction mode, it can be converted and be restored by ratio, reduction operation is as described above.
In alternative embodiment of the invention, load circuit can be LED circuit, and the first analog signal can be believed for voltage
Number, the second analog signal can be current signal.Herein, the first analog signal and the second analog signal can be LED electricity respectively
The voltage signal and current signal of LED in road is also possible to drive the voltage signal and current signal of output in LED circuit.This
When, it can the voltage signal to the LED as the first analog signal and as the second mould respectively in step S902 and step S904
The current signal of the LED of quasi- signal is sampled, also, restores in step S908 the value and electricity of the voltage signal of LED
After the value for flowing signal, display LED can also be controlled according to the value of the voltage signal of obtained LED and the value of current signal
State, and/or control LED shine.
Further, LED circuit may include driving circuit, at this point, driving circuit of the PWM drive signal by LED circuit
It generates.
In practical applications, driving circuit can be Switching Power Supply, and then can be using the driving IC institute in Switching Power Supply
The pwm signal for carrying out energy conversion for the switching tube (usually metal-oxide-semiconductor) in driving switch power supply generated drives as PWM
Signal source therefrom extracts part pwm signal as the PWM drive signal.
In alternative embodiment of the invention, the signal monitoring method can with the following steps are included:
The value of voltage signal and the value of current signal of the LED circuit obtained according to reduction control the LED circuit.
Further, which can also be set with voltage signal operation interval and current signal operation interval.This
When, the signal monitoring method can with the following steps are included:
If the value of the voltage signal of LED circuit except voltage signal operation interval, adjusts the driving circuit of LED circuit
Output voltage, until the value of the voltage signal is in voltage signal operation interval；
If the value of the current signal of LED circuit except current signal operation interval, adjusts the driving circuit of LED circuit
Output electric current, until the value of the current signal is in current signal operation interval.
It should be noted that above-mentioned all optional embodiments can be any group by the way of combining in practical application
It closes, forms alternative embodiment of the invention, this is no longer going to repeat them.
According to the combination of any one above-mentioned preferred embodiment or multiple preferred embodiments, the embodiment of the present invention can reach
It is following the utility model has the advantages that
The technical solution that the embodiment of the present invention proposes, firstly, by the first and second sample circuits respectively to first and the
Two analog signals are sampled, and first and second sampled signals with the voltage value in different predetermined voltage ranges are exported；
Then, the first and second sampled signals are inputted into the first and second switching elements respectively, it should using PWM drive signal control
The turn-on and turn-off of first and second switching elements keep first switch switching element and second switch switching element timesharing defeated
First sampled signal and the second sampled signal out, the first sampled signal and the second sampled signal group are combined into square waveform
Composite signal, and export the composite signal to subsequent element, thus realize by two kinds of analog signal groups be combined into one it is compound
Signal is transmitted with will pass through a line, has been effectively saved the connectivity port number needed in transmission, is conducive to reduce product
Size.
Further, after receiving the composite signal by micro-control unit MCU, the waveform of the composite signal is read respectively
Upper voltage magnitude and lower voltage magnitude obtain the value of the first and second analog signals by judgement and rule reduction conversion, thus
Realize the monitoring to the first and second analog signals.Since the corresponding sampled signal group of the first and second analog signals is combined into one
A composite signal is transmitted, and MCU need to can only complete the detection of the first and second analog signals using a detection port
And monitoring, it is effectively saved the detection port number of MCU, to reduce MCU cost.The technical solution of the embodiment of the present invention is special
Suitable for the output voltage and the occasion that is monitored of electric current to LED product.
Further, it when being applied to LED circuit, can also be produced by providing the driving circuit of driving power for LED
The PWM drive signal of the first and second switching elements of raw driving, without increasing the circuit for generating PWM drive signal newly, into
One step reduces cost.
In the instructions provided here, numerous specific details are set forth.It is to be appreciated, however, that implementation of the invention
Example can be practiced without these specific details.In some instances, well known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this specification.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, those skilled in the art should understand that: at this
Within the spirit and principle of invention, it is still possible to modify the technical solutions described in the foregoing embodiments or right
Some or all of the technical features are equivalently replaced；And these are modified or replaceed, and do not make corresponding technical solution de-
From protection scope of the present invention.
Claims (23)
1. a kind of signal integration circuit characterized by comprising
First sample circuit exports the had in the first predetermined voltage range for sampling to the first analog signal
First sampled signal of one voltage；
Second sample circuit exports the had in the second predetermined voltage range for sampling to the second analog signal
Second sampled signal of two voltages, second predetermined voltage range are not overlapped with first predetermined voltage range；
First switch switching element has input, output end and control terminal, and the input of the first switch switching element
End is connect with the output of first sample circuit；
Second switch switching element has input, output end and control terminal, and the input of the second switch switching element
End is connect with the output of second sample circuit, and the output end of the second switch switching element and the first switch switch
The output end of element connects；And
Pulse width modulation (PWM) source driving signal is opened with the control terminal of the first switch switching element and described second respectively
The control terminal connection for closing switching element, for exporting a PWM drive signal with specified waveform, to control the first switch
The turn-on and turn-off of switching element and the second switch switching element；Wherein, under the control of the PWM drive signal, institute
The conducting of any one of first switch switching element and the second switch switching element is stated, then another one turns off, to make institute
It states first switch switching element and the second switch switching element timesharing exports first sampled signal and described second and adopts
Sample signal, first sampled signal and the second sampled signal group, which are combined into, has square corresponding with the specified waveform
The composite signal of shape waveform.
2. signal integration circuit according to claim 1, which is characterized in that first analog signal is voltage signal,
Second analog signal is current signal.
3. signal integration circuit according to claim 1 or 2, which is characterized in that the first switch switching element and institute
Stating second switch switching element is Metal Oxide Semiconductor Field Effect Transistor MOSFET or silicon controlled rectifier (SCR) SCR.
4. signal integration circuit according to claim 3, which is characterized in that the first switch switching element and described
One in two switching elements is N-type Metal Oxide Semiconductor Field Effect Transistor NMOSFET, the other is p-type is golden
Belong to oxide semiconductor field effect transistor PMOSFET.
5. signal integration circuit according to claim 1 or 2, which is characterized in that first predetermined voltage range is 3-
5V, and second predetermined voltage range is 0-2V.
6. a kind of signal monitoring circuit, for load circuit the first analog signal and the second analog signal be monitored,
It is characterized in that, the signal monitoring circuit includes:
Signal integration circuit according to any one of claims 1-5, connect with the load circuit, for described negative
The first analog signal and the second analog signal for carrying circuit are sampled and export composite signal；And
Micro-control unit is connect with the output of the signal integration circuit, for receiving the composite signal, respectively described in reading
The upper voltage magnitude of the waveform of composite signal and lower voltage magnitude, judge in the upper voltage magnitude and the lower voltage magnitude
Each is the value of first sampled signal or the value of second sampled signal respectively, is restored according to specified rule described
The value of the value of first analog signal and second analog signal.
7. signal monitoring circuit according to claim 6, which is characterized in that
The micro-control unit is also used to:
By each of the upper voltage magnitude and the lower voltage magnitude respectively with first predetermined voltage range and institute
The second predetermined voltage range is stated to compare；
If one in the upper voltage magnitude and the lower voltage magnitude is in first predetermined voltage range and another
It is a in second predetermined voltage range, then judge that the voltage magnitude in first predetermined voltage range is described
The value of one sampled signal, and judge that the voltage magnitude in second predetermined voltage range is second sampled signal
Value.
8. signal monitoring circuit according to claim 6 or 7, which is characterized in that the load circuit is light emitting diode
LED circuit, first analog signal are voltage signal, and second analog signal is current signal.
9. signal monitoring circuit according to claim 8, which is characterized in that the LED circuit includes driving circuit, described
Driving circuit is connect with the micro-control unit, for being the LED in the LED circuit under the control of the micro-control unit
Driving power is provided；
Wherein, the PWM drive signal source is generated by the driving circuit.
10. signal monitoring circuit according to claim 9, which is characterized in that the micro-control unit is also used to:
The LED circuit is controlled according to the value of the voltage signal and the value of the current signal.
11. signal monitoring circuit according to claim 10, which is characterized in that the LED circuit is set with voltage signal
Operation interval and current signal operation interval；
The micro-control unit is also used to:
If the value of the voltage signal adjusts the driving circuit of the LED circuit except the voltage signal operation interval
Output voltage, until the value of the voltage signal is in the voltage signal operation interval；
If the value of the current signal adjusts the driving circuit of the LED circuit except the current signal operation interval
Output electric current, until the value of the current signal is in the current signal operation interval.
12. a kind of signal integration method characterized by comprising
The first analog signal is converted to the first sampling with the first voltage in the first predetermined voltage range by sampling
Signal；
The second analog signal is converted to the second sampling with the second voltage in the second predetermined voltage range by sampling
Signal, second predetermined voltage range are not overlapped with first predetermined voltage range；
It is input with first sampled signal and second sampled signal, in the pulse width modulation that one has specified waveform
The first level section and second electrical level section under the control of PWM drive signal, in each period of the PWM drive signal
First sampled signal and second sampled signal are exported respectively, by first sampled signal and second sampling
Signal group is combined into the composite signal with square waveform corresponding with the specified waveform.
13. signal integration method according to claim 12, which is characterized in that first analog signal is voltage letter
Number, second analog signal is current signal.
14. signal integration method according to claim 12 or 13, which is characterized in that pass through first switch switching element control
The output for making first sampled signal controls the output of second sampled signal by second switch switching element；Wherein,
The PWM drive signal controls the turn-on and turn-off of the first switch switching element and the second switch switching element, makes
Obtain the first level section in each period of the PWM drive signal, the first switch switching element conducting and institute
Second switch switching element is stated to turn off, and the second electrical level section in each period of the PWM drive signal, described first
Switching element OFF and second switch switching element conducting.
15. signal integration method according to claim 14, which is characterized in that the first switch switching element and described
Second switch switching element is Metal Oxide Semiconductor Field Effect Transistor MOSFET or silicon controlled rectifier (SCR) SCR.
16. signal integration method according to claim 15, which is characterized in that the first switch switching element and described
One in second switch switching element is N-type Metal Oxide Semiconductor Field Effect Transistor NMOSFET, the other is p-type
Metal Oxide Semiconductor Field Effect Transistor PMOSFET.
17. signal integration method according to claim 12 or 13, which is characterized in that first predetermined voltage range is
3-5V, and second predetermined voltage range is 0-2V.
18. a kind of signal monitoring method, for load circuit the first analog signal and the second analog signal be monitored,
It is characterized in that, comprising:
By signal integration method described in any one of 2-17 according to claim 1, by first analog signal and described
Second analog signal is respectively converted into the first sampled signal and the second sampled signal, and by first sampled signal and described
Two sampled signals are integrated into composite signal；And
The composite signal is received, reads the upper voltage magnitude and lower voltage magnitude of the waveform of the composite signal respectively, is judged
Each of the upper voltage magnitude and the lower voltage magnitude are the value or described second of first sampled signal respectively
The value of sampled signal, and the value of first analog signal and the value of second analog signal are restored according to specified rule.
19. signal monitoring method according to claim 18, which is characterized in that judge the upper voltage magnitude and it is described under
Each of voltage magnitude is the value of first sampled signal or the value of second sampled signal respectively, comprising:
By each of the upper voltage magnitude and the lower voltage magnitude respectively with first predetermined voltage range and institute
The second predetermined voltage range is stated to compare；
If one in the upper voltage magnitude and the lower voltage magnitude is in first predetermined voltage range and another
It is a in second predetermined voltage range, then judge that the voltage magnitude in first predetermined voltage range is described
The value of one sampled signal, and judge that the voltage magnitude in second predetermined voltage range is second sampled signal
Value.
20. signal monitoring method described in 8 or 19 according to claim 1, which is characterized in that the load circuit is light-emitting diodes
Pipe LED circuit, first analog signal are voltage signal, and second analog signal is current signal.
21. signal monitoring method according to claim 20, which is characterized in that the LED circuit includes driving circuit；Institute
PWM drive signal is stated to be generated by the driving circuit of the LED circuit.
22. signal monitoring method according to claim 21, which is characterized in that further include:
The LED circuit is controlled according to the value of the voltage signal and the value of the current signal.
23. signal monitoring method according to claim 22, wherein the LED circuit is set with voltage signal workspace
Between and current signal operation interval；
The LED circuit is controlled according to the value of the voltage signal and the value of the current signal, comprising:
If the value of the voltage signal adjusts the driving circuit of the LED circuit except the voltage signal operation interval
Output voltage, until the value of the voltage signal is in the voltage signal operation interval；
If the value of the current signal adjusts the driving circuit of the LED circuit except the current signal operation interval
Output electric current, until the value of the current signal is in the current signal operation interval.
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| US20130033194A1 (en) * | 2011-08-02 | 2013-02-07 | Samsung Electronics Co., Ltd. | Apparatus and method for controlling led driving circuit and apparatus and method for driving led |
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