WO2016033828A1 - 光源驱动电路及方法 - Google Patents

光源驱动电路及方法 Download PDF

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Publication number
WO2016033828A1
WO2016033828A1 PCT/CN2014/086640 CN2014086640W WO2016033828A1 WO 2016033828 A1 WO2016033828 A1 WO 2016033828A1 CN 2014086640 W CN2014086640 W CN 2014086640W WO 2016033828 A1 WO2016033828 A1 WO 2016033828A1
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WO
WIPO (PCT)
Prior art keywords
light source
signal
source driving
pulse width
width modulation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2014/086640
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English (en)
French (fr)
Inventor
张先明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Filing date
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Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US14/408,119 priority Critical patent/US9585213B2/en
Publication of WO2016033828A1 publication Critical patent/WO2016033828A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • 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
    • 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]

Definitions

  • the present invention relates to the field of light source driving technologies, and in particular, to a light source driving circuit and method.
  • LED (Light Emitting Diode) driver chip receives PWM (Pulse Width) A Modulation (Pulse Width Modulation) signal, a control signal is generated based on the PWM signal, and the LED light bar is controlled by the control signal.
  • PWM Pulse Width
  • Modulation Pulse Width Modulation
  • the LED driving chip generally needs eight PWM signal receiving ends and eight control signal output ends, and for a larger number of LED lights,
  • the above LED driver chip requires more pins, or more LED driver chips are needed to match the corresponding LED lamps, which adds a lot of cost.
  • a light source driving circuit for providing a light source driving signal to a light source, the light source comprising at least one light emitting component, the light source driving circuit comprising: a light source driving chip, configured to generate the light source driving signal, and to the light source Outputting the light source driving signal; at least one first pulse width modulation signal input terminal for receiving at least one first pulse width modulation signal; and a first control circuit, the light source, the light source driving chip, and the a first pulse width modulation signal input terminal, the first control circuit configured to receive the first pulse width modulation signal from the first pulse width modulation signal input end, and to modulate the signal according to the first pulse width modulation Controlling the light source to emit light; wherein the light source driving chip is configured to output the light source driving signal to the light source through the first control circuit; the light source driving chip is further configured to receive a current detecting related to the light source Measuring a signal, and configured to generate the light source driving signal according to the current detecting signal, wherein the current detecting signal a signal related to
  • the first control circuit includes: at least one first field effect transistor, the first field effect transistor includes: a first control terminal connected to the first pulse width modulation signal input end The first control end is configured to receive the first pulse width modulation signal, and is configured to control a first current between the first input end and the first output end according to the first pulse width modulation signal a channel is opened or closed; a first input end is connected to the light source driving signal output end, the first input end is configured to receive the light source driving signal; and a first output end is connected to the light emitting part and the The current detecting signal input terminal is connected, and the first output terminal is configured to output the light source driving signal when the first current channel is turned on.
  • the light source driving chip further includes: a second pulse width modulation signal input terminal for receiving a second pulse width modulation signal; and at least one control signal output terminal for outputting at least one control a signal, wherein the control signal corresponds to the second pulse width modulation signal; the main chip is further configured to generate the control signal according to the second pulse width modulation signal; the light source driving circuit further includes: a second control circuit connected to the light source driving chip, the first control circuit and the light source, wherein the second control circuit is configured to control the light source to emit light according to the control signal; wherein the first control A circuit is coupled to the light source by the second control circuit.
  • a light source driving circuit for providing a light source driving signal to a light source, the light source comprising at least one light emitting component, the light source driving circuit comprising: a light source driving chip, configured to generate the light source driving signal, and output to the light source The light source driving signal; at least one first pulse width modulation signal input end for receiving at least one first pulse width modulation signal; and a first control circuit, the light source, the light source driving chip, and the first a pulse width modulation signal input terminal, the first control circuit configured to receive the first pulse width modulation signal from the first pulse width modulation signal input end, and to control the control unit according to the first pulse width modulation signal
  • the light source driving chip is configured to output the light source driving signal to the light source through the first control circuit.
  • the light source driving chip is further configured to receive a current detecting signal related to the light source, and configured to generate the light source driving signal according to the current detecting signal, wherein the current detecting The signal is a signal related to the current flowing through the source.
  • the light source driving chip includes: at least one current detecting signal input end connected to the light source, the current detecting signal input end is configured to receive a current detecting signal; and a main chip is used for Generating the light source driving signal according to the current detecting signal; and at least one light source driving signal output end connected to the first control circuit, wherein the light source driving signal output end is configured to output the light source driving signal.
  • the first control circuit includes: at least one first field effect transistor, the first field effect transistor includes: a first control end connected to the first pulse width modulation signal input end, The first control end is configured to receive the first pulse width modulation signal, and is configured to control a first current channel between the first input end and the first output end according to the first pulse width modulation signal Turning on or off; a first input end connected to the light source driving signal output end, the first input end being configured to receive the light source driving signal; and a first output end, the light emitting part and the current detecting The signal input terminal is connected, and the first output terminal is configured to output the light source driving signal when the first current channel is turned on.
  • the light source driving chip further includes: a second pulse width modulation signal input terminal for receiving a second pulse width modulation signal; and at least one control signal output terminal for outputting at least one control a signal, wherein the control signal corresponds to the second pulse width modulation signal; the main chip is further configured to generate the control signal according to the second pulse width modulation signal; the light source driving circuit further includes: a second control circuit connected to the light source driving chip, the first control circuit and the light source, wherein the second control circuit is configured to control the light source to emit light according to the control signal; wherein the first control circuit Connected to the light source by the second control circuit.
  • the second control circuit includes: at least one second field effect transistor, the second field effect transistor includes: a second control end connected to the control signal output end, the second The control end is configured to receive the control signal, and control, according to the control signal, a second current channel between the second input end and the second output end to be turned on or off; the second input end, and the first An output end is connected, the second input end is configured to receive the light source driving signal from the first output end, and a second output end is connected to the light emitting part and the current detecting signal input end, The second output terminal is configured to output the light source driving signal to the light emitting member when the second current channel is turned on; the first control circuit is further configured to pass the first when the second current channel is turned on A second control circuit transmits the light source drive signal to the light source.
  • the light source driving chip includes a first predetermined number of the current detecting signal input ends and the first predetermined number of the light source driving signal output ends.
  • the light source driving circuit is connected to a pulse width modulation signal generating circuit;
  • the light source driving chip includes a second predetermined number of the second pulse width modulation signal input terminals and the first predetermined number of The control signal output end, the second predetermined number of the second pulse width modulation signal input ends and any of the second predetermined number of the pulse width modulation signal output ends of the pulse width modulation signal generating circuit connection.
  • the main chip is further configured to receive the second predetermined number of the second pulse width modulation signals through a receiving end, and according to the second predetermined number of the second pulse width modulations The signal generates the first predetermined number of the control signals.
  • the first predetermined number is 8, and the second predetermined number is 1.
  • a light source driving method comprising the steps of: a light source driving chip generating the light source driving signal, and outputting the light source driving signal to the light source; the first pulse width modulation signal input end receiving at least a first pulse width And modulating the signal; and the first control circuit receives the first pulse width modulation signal from the first pulse width modulation signal input terminal, and controls the light source to emit light according to the first pulse width modulation signal.
  • the step of generating the light source driving signal by the light source driving chip includes: the light source driving chip receiving a current detecting signal related to the light source, and generating the current according to the current detecting signal A light source driving signal, wherein the current detecting signal is a signal related to a current flowing through the light source.
  • the light source driving chip generates the light source driving signal, and outputs the light source driving signal to the light source: the current detecting signal input end of the light source driving chip receives the current Detecting a signal, wherein the current detecting signal input end is connected to the light source; the main chip of the light source driving chip generates the light source driving signal according to the current detecting signal; and the light source of the light source driving chip The driving signal output end outputs the light source driving signal, wherein the light source driving signal output end is connected to the first control circuit.
  • the first control circuit receives the first pulse width modulation signal from the first pulse width modulation signal input end, and controls the light source to emit light according to the first pulse width modulation signal.
  • the method includes: receiving, by the first control end of the first field effect transistor of the first control circuit, the first pulse width modulation signal, and controlling the first input terminal and the first pulse width modulation signal according to the first pulse width modulation signal a first current path between the first output terminals is turned on or off, wherein the first control terminal is coupled to the first pulse width modulation signal input; the first field effect transistor of the first control circuit Receiving, by an input, the light source driving signal, wherein the first input end is coupled to the light source driving signal output end; and the first output end of the first field effect transistor of the first control circuit is in the The light source driving signal is output when a current channel is turned on, wherein the first output end is connected to the light emitting member and the current detecting signal input end.
  • the method further includes the steps of: receiving, by the second pulse width modulation signal input end of the light source driving chip, a second pulse width modulation signal; the main chip of the light source driving chip is according to the first The second pulse width modulation signal generates at least one control signal; the control signal output end of the light source driving chip outputs the control signal, wherein the control signal corresponds to the second pulse width modulation signal; and the light source driving circuit
  • the second control circuit controls the light source to emit light according to the control signal, wherein the second control circuit is connected to the light source driving chip, the first control circuit and the light source, and the first control circuit passes The second control circuit is coupled to the light source.
  • the second control circuit of the light source driving circuit controls the light source to emit light according to the control signal
  • the second control terminal of the second field effect transistor of the second control circuit receives the control And controlling, according to the control signal, a second current channel between the second input end and the second output end to be turned on or off, wherein the second control end is connected to the control signal output end
  • a second input end of the second field effect transistor of the second control circuit receives the light source driving signal from the first output terminal, wherein the second input terminal is coupled to the first output terminal
  • the second control circuit a second output end of the second field effect transistor outputs the light source driving signal to the light emitting member when the second current channel is turned on, wherein the second output terminal and the light emitting member and the current detector
  • the signal input terminal is connected; and when the second current channel is turned on, the first control circuit transmits the light source driving signal to the light source through the second control circuit.
  • the step of generating, by the main chip of the light source driving chip, the at least one control signal according to the second pulse width modulation signal comprises: receiving, by the receiving end, the second predetermined number of the a second pulse width modulated signal and generating the first predetermined number of the control signals based on the second predetermined number of the second pulse width modulated signals.
  • the present invention can be applied to complex electronic circuit device application environments.
  • FIG. 1 is a block diagram showing a first embodiment of a connection relationship between a light source driving circuit and a light source and a pulse width modulation signal generating circuit of the present invention
  • FIG. 2 is a circuit diagram of a first embodiment of a connection relationship between a light source driving circuit of FIG. 1 and a light source and a pulse width modulation signal generating circuit;
  • FIG. 3 is a block diagram showing a second embodiment of a connection relationship between a light source driving circuit and a light source and a pulse width modulation signal generating circuit of the present invention
  • FIG. 4 is a circuit diagram showing a second embodiment of the connection relationship between the light source driving circuit of FIG. 3 and the light source and the pulse width modulation signal generating circuit;
  • Figure 5 is a flow chart showing a first embodiment of a light source driving method of the present invention.
  • FIG. 6 is a flow chart showing the steps of generating a light source driving signal by the light source driving chip of FIG. 5 and outputting a light source driving signal to the light source;
  • FIG. 7 is a flow chart showing the steps of the first control circuit of FIG. 5 receiving the first pulse width modulation signal and controlling the illumination of the light source according to the first pulse width modulation signal;
  • Figure 8 is a flow chart showing a second embodiment of the light source driving method of the present invention.
  • FIG. 9 is a flow chart showing the steps of the second control circuit of FIG. 8 controlling the illumination of the light source according to the control signal.
  • FIG. 1 is a block diagram of a first embodiment of a connection relationship between a light source driving circuit 102 and a light source 103 and a pulse width modulation signal generating circuit 101
  • FIG. 2 is a light source driving circuit 102 of FIG.
  • the light source driving circuit 102 of the present embodiment is configured to provide a light source driving signal to the light source 103.
  • the light source 103 includes at least one light emitting member 1031, and the light source 103 can be, for example, an LED (Light).
  • An Emitting Diode (Light Emitting Diode) light strip which may be, for example, an LED light.
  • the light source driving circuit 102 and the light source 103 and pulse width modulation (PWM, Pulse Width Modulation) Signal generation circuit connection.
  • PWM Pulse Width Modulation
  • the light source driving circuit 102 includes a light source driving chip 1021, at least a first pulse width modulation signal input terminal 1023, and a first control circuit 1022.
  • the first control circuit 1022 is connected to the light source 103 (the light emitting member 1031), the light source driving chip 1021, and the first pulse width modulation signal input end 1023, and the light source driving chip 1021 and The illuminating member 1031 is connected, and the first pulse width modulation signal input terminal 1023 is connected to the pulse width modulation signal generating circuit 101.
  • the light source driving chip 1021 is configured to generate the light source driving signal, and output the light source driving signal to the light source 103.
  • the first pulse width modulation signal input terminal 1023 is configured to receive at least one first pulse width modulation signal from the pulse width modulation signal generation circuit 101.
  • the first control circuit 1022 is configured to receive the first pulse width modulation signal from the first pulse width modulation signal input terminal 1023, and to control the light source 103 to emit light according to the first pulse width modulation signal.
  • the light source driving chip 1021 is configured to output the light source driving signal to the light source 103 through the first control circuit 1022.
  • the light source driving chip 1021 is further configured to receive a current detecting signal associated with the light source 103, and configured to generate the light source driving signal according to the current detecting signal, wherein the current detecting The measured signal is a signal related to the current flowing through the light source 103.
  • the light source driving circuit 102 further includes a current detecting signal output end 1024, and the current detecting signal output end 1024 is connected to the light emitting part 1031 (the light source 103) and the light source driving chip 1021.
  • the light source driving chip 1021 includes at least one current detecting signal input end 10211, a main chip, and at least one light source driving signal output end 10212.
  • the current detection signal output terminal 1024 is connected to the current detection signal input terminal 10211.
  • the light source driving signal output terminal 10212 is connected to the first control circuit 1022.
  • the current detecting signal input end 10211 is connected to the light source 103 through the current detecting signal output end 1024, and the current detecting signal input end 10211 is configured to receive current detecting from the current detecting signal output end 1024. Measuring signal.
  • the main chip is connected to the current detecting signal input end 10211 and the light source driving signal output end 10212, and the main chip is configured to generate the light source driving signal according to the current detecting signal.
  • the light source driving signal output end 10212 is connected to the first control circuit 1022, and the light source driving signal output end 10212 is configured to output the light source driving signal.
  • the first control circuit 1022 includes at least one first field effect transistor, wherein the first field effect transistor includes a first control terminal 10221, a first input terminal 10222, and a first output terminal 10223.
  • the first control terminal 10221 is connected to the first pulse width modulation signal input terminal 1023, and the first control terminal 1021 is configured to receive the first pulse width modulation signal and is configured to perform modulation according to the first pulse width.
  • the signal controls the first current channel between the first input terminal 10222 and the first output terminal 10223 to be turned on or off.
  • the first input end 10222 is connected to the light source driving signal output end 1012, and the first input end 10222 is configured to receive the light source driving signal.
  • the first output end 10223 is connected to the light emitting part 1031 and the current detecting signal input end 10211, and the first output end 1023 is configured to output the light source driving signal when the first current channel is turned on.
  • the light source driving chip 1021 includes N (first predetermined number) of the current detecting signal input terminals 10211 and N light source driving signal output terminals 10212, and the first control circuit 1022 includes N first field effect transistors, the light source 103 includes N light emitting elements 1031, and the light source driving circuit 102 includes N current detecting signal output ends 1024, the pulse width modulated signals
  • the generating circuit 101 includes N pulse width modulated signal output terminals 1011.
  • the N pulse width modulation signal output terminals 1011 of the pulse width modulation signal generating circuit 101 respectively pass N the pulse width modulation signal input terminals and the first input terminals of the N first field effect transistors 10222 is connected; the N light source driving signal output ends 10212 of the light source driving chip 1021 are respectively connected to the first control terminals 10221 of the N first field effect transistors; N the first field effect transistors The first output terminals 10223 are respectively connected to the N light-emitting members 1031 of the light source 103; the N light-emitting members 1031 of the light source 103 further pass through the N current detecting signal output ends 1024 respectively. And connecting to the N current detecting signal input terminals 10211.
  • N is a positive integer, for example, N is 8.
  • FIG. 3 is a block diagram of a second embodiment of the connection relationship between the light source driving circuit 102 and the light source 103 and the pulse width modulation signal generating circuit 101
  • FIG. 4 is the light source driving circuit 102 of FIG.
  • This embodiment is similar to the first embodiment described above, except that:
  • the light source driving chip 1021 further includes a second pulse width modulation signal input terminal and at least one control signal output terminal 10214.
  • the second pulse width modulation signal input terminal is configured to receive a second pulse width modulation signal.
  • the control signal output end 10214 is configured to output at least one control signal, wherein the control signal corresponds to the second pulse width modulation signal.
  • the main chip is further configured to generate the control signal according to the second pulse width modulation signal. Specifically, the main chip is further configured to receive M pieces of the second pulse width modulation signals through the receiving end 10213, and generate N pieces of the control signals according to the M second pulse width modulation signals.
  • M is a positive integer, for example, M is 1 and N is 8.
  • the light source driving circuit 102 further includes a second control circuit 1025.
  • the second control circuit 1025 is connected to the light source driving chip 1021, the first control circuit 1022 and the light source 103, and the second control circuit 1025 is configured to control the light source 103 to emit light according to the control signal.
  • the first control circuit 1022 is connected to the light source 103 through the second control circuit 1025.
  • the second control circuit 1025 includes at least one second field effect transistor, wherein the second field effect transistor includes a second control terminal 10251, a second input terminal 10252, and a second output terminal 10253.
  • the second control end 10251 is connected to the control signal output end 10214, and the second control end 10251 is configured to receive the control signal, and control the second input end 10252 and the first according to the control signal.
  • the second current path between the two outputs 10253 is turned on or off.
  • the second input terminal 10252 is coupled to the first output terminal 1023, and the second input terminal 10252 is configured to receive the light source driving signal from the first output terminal 10223.
  • the second output end 10253 is connected to the illuminating member 1031 and the current detecting signal input end 10211, and the second output end 10253 is configured to output to the illuminating member 1031 when the second current channel is turned on.
  • the light source drives a signal.
  • the second output terminal 10253 is also connected to the current detection signal output terminal 1024.
  • the first control circuit 1022 is further configured to send the light source driving signal to the light source 103 through the second control circuit 1025 when the second current channel is turned on.
  • the light source driving chip 1021 further includes M (second predetermined number) of the second pulse width modulation signal input terminals and N (the first predetermined number) of the control signal outputs. End 10214.
  • the M second pulse width modulation signal input terminals are connected to any of the M pulse width modulation signal output terminals 1011 of the pulse width modulation signal generation circuit 101.
  • the light source driving circuit 102 of the present invention can be flexibly used in combination with the light emitting device 1031 and other electronic components, and can be applied to a complicated electronic circuit device application environment.
  • FIG. 5 is a flowchart of a first embodiment of a light source driving method of the present invention.
  • the light source driving chip 1021 generates the light source driving signal, and outputs the light source driving signal to the light source 103.
  • the first pulse width modulated signal input terminal 1023 receives at least one first pulse width modulated signal.
  • the first control circuit 1022 receives the first pulse width modulation signal from the first pulse width modulation signal input terminal 1023, and controls the light source 103 to emit light according to the first pulse width modulation signal.
  • the step of generating the light source driving signal by the light source driving chip 1021 and outputting the light source driving signal to the light source 103 includes:
  • the light source driving chip 1021 receives a current detecting signal related to the light source 103, and generates the light source driving signal according to the current detecting signal.
  • the current detection signal is a signal related to a current flowing through the light source 103.
  • FIG. 6 is a flowchart of a step of generating a light source driving signal by the light source driving chip 1021 of FIG. 5 and outputting a light source driving signal to the light source 103.
  • the step of the light source driving chip 1021 receiving the current detecting signal associated with the light source 103 and generating the light source driving signal according to the current detecting signal includes:
  • the current detecting signal input end 10211 of the light source driving chip 1021 receives the current detecting signal, wherein the current detecting signal input end 10211 is connected to the light source 103.
  • the main chip of the light source driving chip 1021 generates the light source driving signal according to the current detecting signal, wherein the main chip is connected to the current detecting signal input end 10211 and the light source driving signal output end 10212.
  • the light source driving signal output end 10212 of the light source driving chip 1021 outputs a light source driving signal, wherein the light source driving signal output end 10212 is connected to the first control circuit 1022.
  • FIG. 7 is a flowchart of the step of the first control circuit 1022 of FIG. 5 receiving the first pulse width modulation signal and controlling the light source 103 to emit light according to the first pulse width modulation signal.
  • the step of the first control circuit 1022 receiving the first pulse width modulation signal from the first pulse width modulation signal input terminal 1023 and controlling the light source 103 to emit light according to the first pulse width modulation signal includes: :
  • the first control terminal 10221 of the first field effect transistor of the first control circuit 1022 receives the first pulse width modulation signal, and controls the first input terminal 10222 and the first pulse width modulation signal according to the first pulse width modulation signal.
  • the first current channel between the first output terminals 10223 is turned on or off, wherein the first control terminal 10221 is connected to the first pulse width modulation signal input terminal 1023.
  • the first input end 10222 of the first field effect transistor of the first control circuit 1022 receives the light source driving signal, wherein the first input end 10222 is connected to the light source driving signal output end 10212.
  • the first output end 1023 of the first field effect transistor of the first control circuit 1022 outputs the light source driving signal when the first current channel is turned on, wherein the first output end 10223 and the light emitting part 1031
  • the current detecting signal input terminal 10211 is connected.
  • FIG. 8 is a flowchart of a second embodiment of a light source driving method of the present invention.
  • This embodiment is similar to the first embodiment described above, except that:
  • the method also includes the following steps:
  • the second pulse width modulation signal input end of the light source driving chip 1021 receives a second pulse width modulation signal.
  • the main chip of the light source driving chip 1021 generates at least one control signal according to the second pulse width modulation signal.
  • the control signal output end 10214 of the light source driving chip 1021 outputs the control signal, wherein the control signal corresponds to the second pulse width modulation signal.
  • the second control circuit 1025 of the light source driving circuit 102 controls the light source 103 to emit light according to the control signal, wherein the second control circuit 1025 and the light source driving chip 1021, the first control circuit 1022 and the The light source 103 is connected, and the first control circuit 1022 is connected to the light source 103 via the second control circuit 1025.
  • FIG. 9 is a flowchart of the step of controlling the light source 103 to emit light according to the control signal by the second control circuit 1025 of FIG.
  • the step of controlling the light source 103 to emit light according to the control signal by the second control circuit 1025 of the light source driving circuit 102 includes:
  • the second control terminal 10251 of the second field effect transistor of the second control circuit 1025 receives the control signal, and controls between the second input terminal 10252 and the second output terminal 10253 according to the control signal.
  • the second current channel is turned on or off, wherein the second control terminal 10251 is connected to the control signal output terminal 10214.
  • the second input terminal 10252 of the second field effect transistor of the second control circuit 1025 receives the light source driving signal from the first output terminal 10223, wherein the second input terminal 10252 and the first output terminal 10223 connection.
  • the second output terminal 10253 of the second field effect transistor of the second control circuit 1025 outputs the light source driving signal to the light emitting member 1031 when the second current channel is turned on, wherein the second output terminal 10253 Connecting with the light emitting member 1031 and the current detecting signal input end 10211;
  • the first control circuit 1022 transmits the light source driving signal to the light source 103 through the second control circuit 1025 when the second current channel is turned on.
  • the light source driving method of the present invention can be flexibly used in combination with the light-emitting member 1031 and other electronic components, and can be applied to a complicated electronic circuit device application environment.

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Abstract

提供了一种光源驱动电路（102）及方法。该光源驱动电路（102）用于向光源（103）提供光源驱动信号；所述光源（103）包括至少一发光件（1031）；其中所述光源驱动电路（102）包括：一光源驱动芯片（1021），用于生成所述光源驱动信号，并向所述光源（103）输出所述光源驱动信号；至少一第一脉冲宽度调制信号输入端（1023），用于接收至少一第一脉冲宽度调制信号；以及与所述光源（103）、所述光源驱动芯片（1021）、第一脉冲宽度调制信号输入端（1023）连接的第一控制电路（1022）；所述第一控制电路（1022）用于根据第一脉冲宽度调制信号控制所述光源（103）发光。

Description

光源驱动电路及方法 技术领域
本发明涉及光源驱动技术领域，特别涉及一种光源驱动电路及方法。
 背景技术
传统的光源（例如，显示面板的背光光源）驱动技术一般为：
LED（Light Emitting Diode，发光二极管）驱动芯片接收PWM（Pulse Width Modulation，脉冲宽度调制）信号，根据该PWM信号生成控制信号，并利用该控制信号来控制LED灯条。
在实践中，发明人发现现有技术至少存在以下问题：
以LED灯条（灯串）包括八个LED灯为例，要实现上述技术方案，LED驱动芯片一般需要八个PWM信号接收端以及八个控制信号输出端，而对于数量更多的LED灯，上述LED驱动芯片则需要更多的针脚，或者需要更多的LED驱动芯片来与相应的LED灯相匹配，这会增加不少成本。
对于一些较复杂的电子电路器件搭配环境，上述技术方案无法适用。
故，有必要提出一种新的技术方案，以解决上述技术问题。
 技术问题
本发明的目的在于提供一种光源驱动电路及方法，其能够适用于复杂的电子电路器件应用环境。
 技术解决方案
一种光源驱动电路，用于向光源提供光源驱动信号，所述光源包括至少一发光件，所述光源驱动电路包括：一光源驱动芯片，用于生成所述光源驱动信号，并向所述光源输出所述光源驱动信号；至少一第一脉冲宽度调制信号输入端，用于接收至少一第一脉冲宽度调制信号；以及一第一控制电路，与所述光源、所述光源驱动芯片以及所述第一脉冲宽度调制信号输入端连接，所述第一控制电路用于从所述第一脉冲宽度调制信号输入端接收所述第一脉冲宽度调制信号，并用于根据所述第一脉冲宽度调制信号控制所述光源发光；其中，所述光源驱动芯片用于通过所述第一控制电路向所述光源输出所述光源驱动信号；所述光源驱动芯片还用于接收与所述光源相关的电流侦测信号，并用于根据所述电流侦测信号生成所述光源驱动信号，其中，所述电流侦测信号为与流经所述光源的电流相关的信号；所述光源驱动芯片包括：至少一电流侦测信号输入端，与所述光源连接，所述电流侦测信号输入端用于接收电流侦测信号；一主芯片，用于根据所述电流侦测信号生成所述光源驱动信号；以及至少一光源驱动信号输出端，与所述第一控制电路连接，所述光源驱动信号输出端用于输出所述光源驱动信号。
在上述光源驱动电路中，所述第一控制电路包括：至少一第一场效应晶体管，所述第一场效应晶体管包括：一第一控制端，与所述第一脉冲宽度调制信号输入端连接，所述第一控制端用于接收所述第一脉冲宽度调制信号，并用于根据所述第一脉冲宽度调制信号控制所述第一输入端和所述第一输出端之间的第一电流通道开启或关闭；一第一输入端，与所述光源驱动信号输出端连接，所述第一输入端用于接收所述光源驱动信号；以及一第一输出端，与所述发光件和所述电流侦测信号输入端连接，所述第一输出端用于在所述第一电流通道开启时输出所述光源驱动信号。
在上述光源驱动电路中，所述光源驱动芯片还包括：一第二脉冲宽度调制信号输入端，用于接收一第二脉冲宽度调制信号；以及至少一控制信号输出端，用于输出至少一控制信号，其中，所述控制信号与所述第二脉冲宽度调制信号对应；所述主芯片还用于根据所述第二脉冲宽度调制信号生成所述控制信号；所述光源驱动电路还包括：一第二控制电路，与所述光源驱动芯片、所述第一控制电路和所述光源连接，所述第二控制电路用于根据所述控制信号控制所述光源发光；其中，所述第一控制电路通过所述第二控制电路与所述光源连接。
一种光源驱动电路，用于向光源提供光源驱动信号，所述光源包括至少一发光件，所述光源驱动电路包括：光源驱动芯片，用于生成所述光源驱动信号，并向所述光源输出所述光源驱动信号；至少一第一脉冲宽度调制信号输入端，用于接收至少一第一脉冲宽度调制信号；以及第一控制电路，与所述光源、所述光源驱动芯片以及所述第一脉冲宽度调制信号输入端连接，所述第一控制电路用于从所述第一脉冲宽度调制信号输入端接收所述第一脉冲宽度调制信号，并用于根据所述第一脉冲宽度调制信号控制所述光源发光；其中，所述光源驱动芯片用于通过所述第一控制电路向所述光源输出所述光源驱动信号。
在上述光源驱动电路中，所述光源驱动芯片还用于接收与所述光源相关的电流侦测信号，并用于根据所述电流侦测信号生成所述光源驱动信号，其中，所述电流侦测信号为与流经所述光源的电流相关的信号。
在上述光源驱动电路中，所述光源驱动芯片包括：至少一电流侦测信号输入端，与所述光源连接，所述电流侦测信号输入端用于接收电流侦测信号；主芯片，用于根据所述电流侦测信号生成所述光源驱动信号；以及至少一光源驱动信号输出端，与所述第一控制电路连接，所述光源驱动信号输出端用于输出所述光源驱动信号。
在上述光源驱动电路中，所述第一控制电路包括：至少一第一场效应晶体管，所述第一场效应晶体管包括：第一控制端，与所述第一脉冲宽度调制信号输入端连接，所述第一控制端用于接收所述第一脉冲宽度调制信号，并用于根据所述第一脉冲宽度调制信号控制所述第一输入端和所述第一输出端之间的第一电流通道开启或关闭；第一输入端，与所述光源驱动信号输出端连接，所述第一输入端用于接收所述光源驱动信号；以及第一输出端，与所述发光件和所述电流侦测信号输入端连接，所述第一输出端用于在所述第一电流通道开启时输出所述光源驱动信号。
在上述光源驱动电路中，所述光源驱动芯片还包括：一第二脉冲宽度调制信号输入端，用于接收一第二脉冲宽度调制信号；以及至少一控制信号输出端，用于输出至少一控制信号，其中，所述控制信号与所述第二脉冲宽度调制信号对应；所述主芯片还用于根据所述第二脉冲宽度调制信号生成所述控制信号；所述光源驱动电路还包括：第二控制电路，与所述光源驱动芯片、所述第一控制电路和所述光源连接，所述第二控制电路用于根据所述控制信号控制所述光源发光；其中，所述第一控制电路通过所述第二控制电路与所述光源连接。
在上述光源驱动电路中，所述第二控制电路包括：至少一第二场效应晶体管，所述第二场效应晶体管包括：第二控制端，与所述控制信号输出端连接，所述第二控制端用于接收所述控制信号，并根据所述控制信号控制所述第二输入端和所述第二输出端之间的第二电流通道开启或关闭；第二输入端，与所述第一输出端连接，所述第二输入端用于从所述第一输出端接收所述光源驱动信号；以及第二输出端，与所述发光件和所述电流侦测信号输入端连接，所述第二输出端用于在所述第二电流通道开启时向所述发光件输出所述光源驱动信号；所述第一控制电路还用于在所述第二电流通道开启时通过所述第二控制电路向所述光源发送所述光源驱动信号。
在上述光源驱动电路中，所述光源驱动芯片包括第一预定数量个所述电流侦测信号输入端和所述第一预定数量个所述光源驱动信号输出端。
在上述光源驱动电路中，所述光源驱动电路与脉冲宽度调制信号生成电路连接；所述光源驱动芯片包括第二预定数量个所述第二脉冲宽度调制信号输入端和所述第一预定数量个所述控制信号输出端，所述第二预定数量个所述第二脉冲宽度调制信号输入端与所述脉冲宽度调制信号生成电路的任意所述第二预定数量个所述脉冲宽度调制信号输出端连接。
在上述光源驱动电路中，所述主芯片还用于通过接收端接收所述第二预定数量个所述第二脉冲宽度调制信号，并根据所述第二预定数量个所述第二脉冲宽度调制信号生成所述第一预定数量个所述控制信号。
在上述光源驱动电路中，所述第一预定数量为8，所述第二预定数量为1。
一种光源驱动方法，所述方法包括以下步骤：光源驱动芯片生成所述光源驱动信号，并向所述光源输出所述光源驱动信号；第一脉冲宽度调制信号输入端接收至少一第一脉冲宽度调制信号；以及第一控制电路从所述第一脉冲宽度调制信号输入端接收所述第一脉冲宽度调制信号，并根据所述第一脉冲宽度调制信号控制所述光源发光。
在上述光源驱动方法中，所述光源驱动芯片生成所述光源驱动信号的步骤包括：所述光源驱动芯片接收与所述光源相关的电流侦测信号，并根据所述电流侦测信号生成所述光源驱动信号，其中，所述电流侦测信号为与流经所述光源的电流相关的信号。
在上述光源驱动方法中，所述光源驱动芯片生成所述光源驱动信号，并向所述光源输出所述光源驱动信号的步骤包括：所述光源驱动芯片的电流侦测信号输入端接收所述电流侦测信号，其中，所述电流侦测信号输入端与所述光源连接；所述光源驱动芯片的主芯片根据所述电流侦测信号生成所述光源驱动信号；以及所述光源驱动芯片的光源驱动信号输出端输出所述光源驱动信号，其中，所述光源驱动信号输出端与所述第一控制电路连接。
在上述光源驱动方法中，所述第一控制电路从所述第一脉冲宽度调制信号输入端接收所述第一脉冲宽度调制信号，并根据所述第一脉冲宽度调制信号控制所述光源发光的步骤包括：所述第一控制电路的第一场效应晶体管的第一控制端接收所述第一脉冲宽度调制信号，并根据所述第一脉冲宽度调制信号控制所述第一输入端和所述第一输出端之间的第一电流通道开启或关闭，其中，所述第一控制端与所述第一脉冲宽度调制信号输入端连接；所述第一控制电路的第一场效应晶体管的第一输入端接收所述光源驱动信号，其中，所述第一输入端与所述光源驱动信号输出端连接；以及所述第一控制电路的第一场效应晶体管的第一输出端在所述第一电流通道开启时输出所述光源驱动信号，其中，所述第一输出端与所述发光件和所述电流侦测信号输入端连接。
在上述光源驱动方法中，所述方法还包括以下步骤：所述光源驱动芯片的第二脉冲宽度调制信号输入端接收一第二脉冲宽度调制信号；所述光源驱动芯片的主芯片根据所述第二脉冲宽度调制信号生成至少一控制信号；所述光源驱动芯片的控制信号输出端输出所述控制信号，其中，所述控制信号与所述第二脉冲宽度调制信号对应；以及所述光源驱动电路的第二控制电路根据所述控制信号控制所述光源发光，其中，所述第二控制电路与所述光源驱动芯片、所述第一控制电路和所述光源连接，所述第一控制电路通过所述第二控制电路与所述光源连接。
在上述光源驱动方法中，所述光源驱动电路的第二控制电路根据所述控制信号控制所述光源发光的步骤包括：第二控制电路的第二场效应晶体管的第二控制端接收所述控制信号，并根据所述控制信号控制所述第二输入端和所述第二输出端之间的第二电流通道开启或关闭，其中，所述第二控制端与所述控制信号输出端连接；第二控制电路的第二场效应晶体管的第二输入端从所述第一输出端接收所述光源驱动信号，其中，所述第二输入端与所述第一输出端连接；第二控制电路的第二场效应晶体管的第二输出端在所述第二电流通道开启时向所述发光件输出所述光源驱动信号，其中，所述第二输出端与所述发光件和所述电流侦测信号输入端连接；以及在所述第二电流通道开启时，所述第一控制电路通过所述第二控制电路向所述光源发送所述光源驱动信号。
在上述光源驱动方法中，所述光源驱动芯片的主芯片根据所述第二脉冲宽度调制信号生成至少一控制信号的步骤包括：所述主芯片通过接收端接收所述第二预定数量个所述第二脉冲宽度调制信号，并根据所述第二预定数量个所述第二脉冲宽度调制信号生成所述第一预定数量个所述控制信号。
 有益效果
相对现有技术，本发明能够适用于复杂的电子电路器件应用环境。
 附图说明
图1为本发明的光源驱动电路与光源和脉冲宽度调制信号生成电路的连接关系的第一实施例的框图；
图2为图1中的光源驱动电路与光源和脉冲宽度调制信号生成电路的连接关系的第一实施例的电路图；
图3为本发明的光源驱动电路与光源和脉冲宽度调制信号生成电路的连接关系的第二实施例的框图；
图4为图3中的光源驱动电路与光源和脉冲宽度调制信号生成电路的连接关系的第二实施例的电路图；
图5为本发明的光源驱动方法的第一实施例的流程图；
图6为图5中光源驱动芯片生成光源驱动信号，并向光源输出光源驱动信号的步骤的流程图；
图7为图5中第一控制电路接收第一脉冲宽度调制信号，并根据第一脉冲宽度调制信号控制光源发光的步骤的流程图；
图8为本发明的光源驱动方法的第二实施例的流程图；
图9为图8中第二控制电路根据控制信号控制光源发光的步骤的流程图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。
参考图1和图2，图1为本发明的光源驱动电路102与光源103和脉冲宽度调制信号生成电路101的连接关系的第一实施例的框图，图2为图1中的光源驱动电路102与光源103和脉冲宽度调制信号生成电路101的连接关系的第一实施例的电路图。
本实施例的光源驱动电路102用于向所述光源103提供光源驱动信号，所述光源103包括至少一发光件1031，所述光源103可例如为LED（Light Emitting Diode，发光二极管）灯条，所述发光件1031可例如为LED灯。所述光源驱动电路102与所述光源103和脉冲宽度调制（PWM，Pulse Width Modulation）信号生成电路连接。
所述光源驱动电路102包括光源驱动芯片1021、至少一第一脉冲宽度调制信号输入端1023和第一控制电路1022。具体地，所述第一控制电路1022与所述光源103（所述发光件1031）、所述光源驱动芯片1021以及所述第一脉冲宽度调制信号输入端1023连接，所述光源驱动芯片1021与所述发光件1031连接，所述第一脉冲宽度调制信号输入端1023与所述脉冲宽度调制信号生成电路101连接。
其中，所述光源驱动芯片1021用于生成所述光源驱动信号，并向所述光源103输出所述光源驱动信号。所述第一脉冲宽度调制信号输入端1023用于从所述脉冲宽度调制信号生成电路101接收至少一第一脉冲宽度调制信号。所述第一控制电路1022用于从所述第一脉冲宽度调制信号输入端1023接收所述第一脉冲宽度调制信号，并用于根据所述第一脉冲宽度调制信号控制所述光源103发光。
其中，所述光源驱动芯片1021用于通过所述第一控制电路1022向所述光源103输出所述光源驱动信号。
在本实施例中，所述光源驱动芯片1021还用于接收与所述光源103相关的电流侦测信号，并用于根据所述电流侦测信号生成所述光源驱动信号，其中，所述电流侦测信号为与流经所述光源103的电流相关的信号。具体地，所述光源驱动电路102还包括电流侦测信号输出端1024，所述电流侦测信号输出端1024与所述发光件1031（所述光源103）和所述光源驱动芯片1021连接。
在本实施例中，所述光源驱动芯片1021包括至少一电流侦测信号输入端10211、一主芯片以及至少一光源驱动信号输出端10212。具体地，所述电流侦测信号输出端1024与所述电流侦测信号输入端10211连接。所述光源驱动信号输出端10212与所述第一控制电路1022连接。
所述电流侦测信号输入端10211通过所述电流侦测信号输出端1024与所述光源103连接，所述电流侦测信号输入端10211用于从所述电流侦测信号输出端1024接收电流侦测信号。所述主芯片与所述电流侦测信号输入端10211和所述光源驱动信号输出端10212连接，所述主芯片用于根据所述电流侦测信号生成所述光源驱动信号。所述光源驱动信号输出端10212与所述第一控制电路1022连接，所述光源驱动信号输出端10212用于输出所述光源驱动信号。
在本实施例中，所述第一控制电路1022包括至少一第一场效应晶体管，其中，所述第一场效应晶体管包括第一控制端10221、第一输入端10222和第一输出端10223。
所述第一控制端10221与所述第一脉冲宽度调制信号输入端1023连接，所述第一控制端10221用于接收所述第一脉冲宽度调制信号，并用于根据所述第一脉冲宽度调制信号控制所述第一输入端10222和所述第一输出端10223之间的第一电流通道开启或关闭。
所述第一输入端10222与所述光源驱动信号输出端10212连接，所述第一输入端10222用于接收所述光源驱动信号。
所述第一输出端10223与所述发光件1031和所述电流侦测信号输入端10211连接，所述第一输出端10223用于在所述第一电流通道开启时输出所述光源驱动信号。
例如，如图2所示，所述光源驱动芯片1021包括N（第一预定数量）个所述电流侦测信号输入端10211和N个所述光源驱动信号输出端10212，所述第一控制电路1022包括N个所述第一场效应晶体管，所述光源103包括N个所述发光件1031，所述光源驱动电路102包括N个所述电流侦测信号输出端1024，所述脉冲宽度调制信号生成电路101包括N个脉冲宽度调制信号输出端1011。所述脉冲宽度调制信号生成电路101的N个所述脉冲宽度调制信号输出端1011分别通过N个所述脉冲宽度调制信号输入端与N个所述第一场效应晶体管的所述第一输入端10222连接；所述光源驱动芯片1021的N个所述光源驱动信号输出端10212分别与N个所述第一场效应晶体管的所述第一控制端10221连接；N个所述第一场效应晶体管的所述第一输出端10223分别与所述光源103的N个所述发光件1031连接；所述光源103的N个所述发光件1031还分别通过N个所述电流侦测信号输出端1024与N个所述电流侦测信号输入端10211连接。在本实施例中，N为正整数，例如，N为8。
参考图3和图4，图3为本发明的光源驱动电路102与光源103和脉冲宽度调制信号生成电路101的连接关系的第二实施例的框图，图4为图3中的光源驱动电路102与光源103和脉冲宽度调制信号生成电路101的连接关系的第二实施例的电路图。
本实施例与上述第一实施例相似，不同之处在于：
在本实施例中，所述光源驱动芯片1021还包括一第二脉冲宽度调制信号输入端以及至少一控制信号输出端10214。
所述第二脉冲宽度调制信号输入端用于接收一第二脉冲宽度调制信号。
所述控制信号输出端10214用于输出至少一控制信号，其中，所述控制信号与所述第二脉冲宽度调制信号对应。
所述主芯片还用于根据所述第二脉冲宽度调制信号生成所述控制信号。具体地，所述主芯片还用于通过接收端10213接收M个所述第二脉冲宽度调制信号，并根据M个所述第二脉冲宽度调制信号生成N个所述控制信号。其中，M为正整数，例如，M为1，N为8。
所述光源驱动电路102还包括第二控制电路1025。
所述第二控制电路1025与所述光源驱动芯片1021、所述第一控制电路1022和所述光源103连接，所述第二控制电路1025用于根据所述控制信号控制所述光源103发光，其中，所述第一控制电路1022通过所述第二控制电路1025与所述光源103连接。
在本实施例中，所述第二控制电路1025包括至少一第二场效应晶体管，其中，所述第二场效应晶体管包括第二控制端10251、第二输入端10252以及第二输出端10253。
所述第二控制端10251与所述控制信号输出端10214连接，所述第二控制端10251用于接收所述控制信号，并根据所述控制信号控制所述第二输入端10252和所述第二输出端10253之间的第二电流通道开启或关闭。所述第二输入端10252与所述第一输出端10223连接，所述第二输入端10252用于从所述第一输出端10223接收所述光源驱动信号。所述第二输出端10253与所述发光件1031和所述电流侦测信号输入端10211连接，所述第二输出端10253用于在所述第二电流通道开启时向所述发光件1031输出所述光源驱动信号。所述第二输出端10253还与所述电流侦测信号输出端1024连接。
所述第一控制电路1022还用于在所述第二电流通道开启时通过所述第二控制电路1025向所述光源103发送所述光源驱动信号。
例如，如图4所示，所述光源驱动芯片1021还包括M（第二预定数量）个所述第二脉冲宽度调制信号输入端和N（所述第一预定数量）个所述控制信号输出端10214。M个所述第二脉冲宽度调制信号输入端与所述脉冲宽度调制信号生成电路101的任意M个所述脉冲宽度调制信号输出端1011连接。
在上述技术方案中，本发明的光源驱动电路102能够灵活地与发光件1031以及其它电子元器件搭配使用，能够适用于复杂的电子电路器件应用环境。
参考图5，图5为本发明的光源驱动方法的第一实施例的流程图。
本实施例的光源驱动方法包括以下步骤：
光源驱动芯片1021生成所述光源驱动信号，并向所述光源103输出所述光源驱动信号。
第一脉冲宽度调制信号输入端1023接收至少一第一脉冲宽度调制信号。
第一控制电路1022从所述第一脉冲宽度调制信号输入端1023接收所述第一脉冲宽度调制信号，并根据所述第一脉冲宽度调制信号控制所述光源103发光。
在本实施例中，所述光源驱动芯片1021生成所述光源驱动信号，并向所述光源103输出所述光源驱动信号的步骤包括：
所述光源驱动芯片1021接收与所述光源103相关的电流侦测信号，并根据所述电流侦测信号生成所述光源驱动信号。
其中，所述电流侦测信号为与流经所述光源103的电流相关的信号。
参考图6，图6为图5中光源驱动芯片1021生成光源驱动信号，并向所述光源103输出光源驱动信号的步骤的流程图。
其中，所述光源驱动芯片1021接收与所述光源103相关的电流侦测信号，并根据所述电流侦测信号生成所述光源驱动信号的步骤包括：
所述光源驱动芯片1021的电流侦测信号输入端10211接收所述电流侦测信号，其中，所述电流侦测信号输入端10211与所述光源103连接。
所述光源驱动芯片1021的主芯片根据所述电流侦测信号生成所述光源驱动信号，其中，所述主芯片与所述电流侦测信号输入端10211和所述光源驱动信号输出端10212连接。
所述光源驱动芯片1021的光源驱动信号输出端10212输出光源驱动信号，其中，所述光源驱动信号输出端10212与所述第一控制电路1022连接。
参考图7，图7为图5中第一控制电路1022接收第一脉冲宽度调制信号，并根据第一脉冲宽度调制信号控制光源103发光的步骤的流程图。
其中，所述第一控制电路1022从所述第一脉冲宽度调制信号输入端1023接收所述第一脉冲宽度调制信号，并根据所述第一脉冲宽度调制信号控制所述光源103发光的步骤包括：
所述第一控制电路1022的第一场效应晶体管的第一控制端10221接收所述第一脉冲宽度调制信号，并根据所述第一脉冲宽度调制信号控制所述第一输入端10222和所述第一输出端10223之间的第一电流通道开启或关闭，其中，所述第一控制端10221与所述第一脉冲宽度调制信号输入端1023连接。
所述第一控制电路1022的第一场效应晶体管的第一输入端10222接收所述光源驱动信号，其中，所述第一输入端10222与所述光源驱动信号输出端10212连接。
所述第一控制电路1022的第一场效应晶体管的第一输出端10223在所述第一电流通道开启时输出所述光源驱动信号，其中，所述第一输出端10223与所述发光件1031和所述电流侦测信号输入端10211连接。
参考图8，图8为本发明的光源驱动方法的第二实施例的流程图。
本实施例与上述第一实施例相似，不同之处在于：
所述方法还包括以下步骤：
所述光源驱动芯片1021的第二脉冲宽度调制信号输入端接收一第二脉冲宽度调制信号。
所述光源驱动芯片1021的主芯片根据所述第二脉冲宽度调制信号生成至少一控制信号。
所述光源驱动芯片1021的控制信号输出端10214输出所述控制信号，其中，所述控制信号与所述第二脉冲宽度调制信号对应。
所述光源驱动电路102的第二控制电路1025根据所述控制信号控制所述光源103发光，其中，所述第二控制电路1025与所述光源驱动芯片1021、所述第一控制电路1022和所述光源103连接，所述第一控制电路1022通过所述第二控制电路1025与所述光源103连接。
参考图9，图9为图8中第二控制电路1025根据控制信号控制光源103发光的步骤的流程图。
其中，所述光源驱动电路102的第二控制电路1025根据所述控制信号控制所述光源103发光的步骤包括：
所述第二控制电路1025的第二场效应晶体管的第二控制端10251接收所述控制信号，并根据所述控制信号控制所述第二输入端10252和所述第二输出端10253之间的第二电流通道开启或关闭，其中，所述第二控制端10251与所述控制信号输出端10214连接。
所述第二控制电路1025的第二场效应晶体管的第二输入端10252从所述第一输出端10223接收所述光源驱动信号，其中，所述第二输入端10252与所述第一输出端10223连接。
所述第二控制电路1025的第二场效应晶体管的第二输出端10253在所述第二电流通道开启时向所述发光件1031输出所述光源驱动信号，其中，所述第二输出端10253与所述发光件1031和所述电流侦测信号输入端10211连接；
在所述第二电流通道开启时，所述第一控制电路1022通过所述第二控制电路1025向所述光源103发送所述光源驱动信号。
在上述技术方案中，本发明的光源驱动方法能够灵活地与发光件1031以及其它电子元器件搭配使用，能够适用于复杂的电子电路器件应用环境。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (20)

  1. 一种光源驱动电路，用于向光源提供光源驱动信号，所述光源包括至少一发光件，其中
    所述光源驱动电路包括：
    一光源驱动芯片，用于生成所述光源驱动信号，并向所述光源输出所述光源驱动信号；
    至少一第一脉冲宽度调制信号输入端，用于接收至少一第一脉冲宽度调制信号；以及
    一第一控制电路，与所述光源、所述光源驱动芯片以及所述第一脉冲宽度调制信号输入端连接，所述第一控制电路用于从所述第一脉冲宽度调制信号输入端接收所述第一脉冲宽度调制信号，并用于根据所述第一脉冲宽度调制信号控制所述光源发光；
    其中，所述光源驱动芯片用于通过所述第一控制电路向所述光源输出所述光源驱动信号；
    所述光源驱动芯片还用于接收与所述光源相关的电流侦测信号，并用于根据所述电流侦测信号生成所述光源驱动信号，其中，所述电流侦测信号为与流经所述光源的电流相关的信号；
    所述光源驱动芯片包括：
    至少一电流侦测信号输入端，与所述光源连接，所述电流侦测信号输入端用于接收电流侦测信号；
    一主芯片，用于根据所述电流侦测信号生成所述光源驱动信号；以及
    至少一光源驱动信号输出端，与所述第一控制电路连接，所述光源驱动信号输出端用于输出所述光源驱动信号。
  2. 根据权利要求1所述的光源驱动电路，其中
    所述第一控制电路包括：
    至少一第一场效应晶体管，所述第一场效应晶体管包括：
    一第一控制端，与所述第一脉冲宽度调制信号输入端连接，所述第一控制端用于接收所述第一脉冲宽度调制信号，并用于根据所述第一脉冲宽度调制信号控制所述第一输入端和所述第一输出端之间的第一电流通道开启或关闭；
    一第一输入端，与所述光源驱动信号输出端连接，所述第一输入端用于接收所述光源驱动信号；以及
    一第一输出端，与所述发光件和所述电流侦测信号输入端连接，所述第一输出端用于在所述第一电流通道开启时输出所述光源驱动信号。
  3. 根据权利要求2所述的光源驱动电路，其中
    所述光源驱动芯片还包括：
    一第二脉冲宽度调制信号输入端，用于接收一第二脉冲宽度调制信号；以及
    至少一控制信号输出端，用于输出至少一控制信号，其中，所述控制信号与所述第二脉冲宽度调制信号对应；
    所述主芯片还用于根据所述第二脉冲宽度调制信号生成所述控制信号；
    所述光源驱动电路还包括：
    一第二控制电路，与所述光源驱动芯片、所述第一控制电路和所述光源连接，所述第二控制电路用于根据所述控制信号控制所述光源发光；
    其中，所述第一控制电路通过所述第二控制电路与所述光源连接。
  4. 一种光源驱动电路，用于向光源提供光源驱动信号，所述光源包括至少一发光件，其中
    所述光源驱动电路包括：
    一光源驱动芯片，用于生成所述光源驱动信号，并向所述光源输出所述光源驱动信号；
    至少一第一脉冲宽度调制信号输入端，用于接收至少一第一脉冲宽度调制信号；以及
    一第一控制电路，与所述光源、所述光源驱动芯片以及所述第一脉冲宽度调制信号输入端连接，所述第一控制电路用于从所述第一脉冲宽度调制信号输入端接收所述第一脉冲宽度调制信号，并用于根据所述第一脉冲宽度调制信号控制所述光源发光；
    其中，所述光源驱动芯片用于通过所述第一控制电路向所述光源输出所述光源驱动信号。
  5. 根据权利要求4所述的光源驱动电路，其中
    所述光源驱动芯片还用于接收与所述光源相关的电流侦测信号，并用于根据所述电流侦测信号生成所述光源驱动信号，其中，所述电流侦测信号为与流经所述光源的电流相关的信号。
  6. 根据权利要求4所述的光源驱动电路，其中
    所述光源驱动芯片包括：
    至少一电流侦测信号输入端，与所述光源连接，所述电流侦测信号输入端用于接收电流侦测信号；
    一主芯片，用于根据所述电流侦测信号生成所述光源驱动信号；以及
    至少一光源驱动信号输出端，与所述第一控制电路连接，所述光源驱动信号输出端用于输出所述光源驱动信号。
  7. 根据权利要求6所述的光源驱动电路，其中
    所述第一控制电路包括：
    至少一第一场效应晶体管，所述第一场效应晶体管包括：
    一第一控制端，与所述第一脉冲宽度调制信号输入端连接，所述第一控制端用于接收所述第一脉冲宽度调制信号，并用于根据所述第一脉冲宽度调制信号控制所述第一输入端和所述第一输出端之间的第一电流通道开启或关闭；
    一第一输入端，与所述光源驱动信号输出端连接，所述第一输入端用于接收所述光源驱动信号；以及
    一第一输出端，与所述发光件和所述电流侦测信号输入端连接，所述第一输出端用于在所述第一电流通道开启时输出所述光源驱动信号。
  8. 根据权利要求7所述的光源驱动电路，其中
    所述光源驱动芯片还包括：
    一第二脉冲宽度调制信号输入端，用于接收一第二脉冲宽度调制信号；以及
    至少一控制信号输出端，用于输出至少一控制信号，其中，所述控制信号与所述第二脉冲宽度调制信号对应；
    所述主芯片还用于根据所述第二脉冲宽度调制信号生成所述控制信号；
    所述光源驱动电路还包括：
    一第二控制电路，与所述光源驱动芯片、所述第一控制电路和所述光源连接，所述第二控制电路用于根据所述控制信号控制所述光源发光；
    其中，所述第一控制电路通过所述第二控制电路与所述光源连接。
  9. 根据权利要求8所述的光源驱动电路，其中
    所述第二控制电路包括：
    至少一第二场效应晶体管，所述第二场效应晶体管包括：
    一第二控制端，与所述控制信号输出端连接，所述第二控制端用于接收所述控制信号，并根据所述控制信号控制所述第二输入端和所述第二输出端之间的第二电流通道开启或关闭；
    一第二输入端，与所述第一输出端连接，所述第二输入端用于从所述第一输出端接收所述光源驱动信号；以及
    一第二输出端，与所述发光件和所述电流侦测信号输入端连接，所述第二输出端用于在所述第二电流通道开启时向所述发光件输出所述光源驱动信号；
    所述第一控制电路还用于在所述第二电流通道开启时通过所述第二控制电路向所述光源发送所述光源驱动信号。
  10. 根据权利要求8所述的光源驱动电路，其中
    所述光源驱动芯片包括第一预定数量个所述电流侦测信号输入端和所述第一预定数量个所述光源驱动信号输出端。
  11. 根据权利要求10所述的光源驱动电路，其中
    所述光源驱动电路与脉冲宽度调制信号生成电路连接；
    所述光源驱动芯片包括第二预定数量个所述第二脉冲宽度调制信号输入端和所述第一预定数量个所述控制信号输出端，所述第二预定数量个所述第二脉冲宽度调制信号输入端与所述脉冲宽度调制信号生成电路的任意所述第二预定数量个所述脉冲宽度调制信号输出端连接。
  12. 根据权利要求11所述的光源驱动电路，其中
    所述主芯片还用于通过接收端接收所述第二预定数量个所述第二脉冲宽度调制信号，并根据所述第二预定数量个所述第二脉冲宽度调制信号生成所述第一预定数量个所述控制信号。
  13. 根据权利要求12所述的光源驱动电路，其中
    所述第一预定数量为8，所述第二预定数量为1。
  14. 一种光源驱动方法，其中
    所述方法包括以下步骤：
    光源驱动芯片生成所述光源驱动信号，并向所述光源输出所述光源驱动信号；
    第一脉冲宽度调制信号输入端接收至少一第一脉冲宽度调制信号；以及
    第一控制电路从所述第一脉冲宽度调制信号输入端接收所述第一脉冲宽度调制信号，并根据所述第一脉冲宽度调制信号控制所述光源发光。
  15. 根据权利要求14所述的光源驱动方法，其中
    所述光源驱动芯片生成所述光源驱动信号的步骤包括：
    所述光源驱动芯片接收与所述光源相关的电流侦测信号，并根据所述电流侦测信号生成所述光源驱动信号，其中，所述电流侦测信号为与流经所述光源的电流相关的信号。
  16. 根据权利要求14所述的光源驱动方法，其中
    所述光源驱动芯片生成所述光源驱动信号，并向所述光源输出所述光源驱动信号的步骤包括：
    所述光源驱动芯片的电流侦测信号输入端接收所述电流侦测信号，其中，所述电流侦测信号输入端与所述光源连接；
    所述光源驱动芯片的主芯片根据所述电流侦测信号生成所述光源驱动信号；以及
    所述光源驱动芯片的光源驱动信号输出端输出所述光源驱动信号，其中，所述光源驱动信号输出端与所述第一控制电路连接。
  17. 根据权利要求16所述的光源驱动方法，其中
    所述第一控制电路从所述第一脉冲宽度调制信号输入端接收所述第一脉冲宽度调制信号，并根据所述第一脉冲宽度调制信号控制所述光源发光的步骤包括：
    所述第一控制电路的第一场效应晶体管的第一控制端接收所述第一脉冲宽度调制信号，并根据所述第一脉冲宽度调制信号控制所述第一输入端和所述第一输出端之间的第一电流通道开启或关闭，其中，所述第一控制端与所述第一脉冲宽度调制信号输入端连接；
    所述第一控制电路的第一场效应晶体管的第一输入端接收所述光源驱动信号，其中，所述第一输入端与所述光源驱动信号输出端连接；以及
    所述第一控制电路的第一场效应晶体管的第一输出端在所述第一电流通道开启时输出所述光源驱动信号，其中，所述第一输出端与所述发光件和所述电流侦测信号输入端连接。
  18. 根据权利要求17所述的光源驱动方法，其中
    所述方法还包括以下步骤：
    所述光源驱动芯片的第二脉冲宽度调制信号输入端接收一第二脉冲宽度调制信号；
    所述光源驱动芯片的主芯片根据所述第二脉冲宽度调制信号生成至少一控制信号；
    所述光源驱动芯片的控制信号输出端输出所述控制信号，其中，所述控制信号与所述第二脉冲宽度调制信号对应；以及
    所述光源驱动电路的第二控制电路根据所述控制信号控制所述光源发光，其中，所述第二控制电路与所述光源驱动芯片、所述第一控制电路和所述光源连接，所述第一控制电路通过所述第二控制电路与所述光源连接。
  19. 根据权利要求18所述的光源驱动方法，其中
    所述光源驱动电路的第二控制电路根据所述控制信号控制所述光源发光的步骤包括：
    第二控制电路的第二场效应晶体管的第二控制端接收所述控制信号，并根据所述控制信号控制所述第二输入端和所述第二输出端之间的第二电流通道开启或关闭，其中，所述第二控制端与所述控制信号输出端连接；
    第二控制电路的第二场效应晶体管的第二输入端从所述第一输出端接收所述光源驱动信号，其中，所述第二输入端与所述第一输出端连接；
    第二控制电路的第二场效应晶体管的第二输出端在所述第二电流通道开启时向所述发光件输出所述光源驱动信号，其中，所述第二输出端与所述发光件和所述电流侦测信号输入端连接；以及
    在所述第二电流通道开启时，所述第一控制电路通过所述第二控制电路向所述光源发送所述光源驱动信号。
  20. 根据权利要求19所述的光源驱动方法，其中
    所述光源驱动芯片的主芯片根据所述第二脉冲宽度调制信号生成至少一控制信号的步骤包括：
    所述主芯片通过接收端接收所述第二预定数量个所述第二脉冲宽度调制信号，并根据所述第二预定数量个所述第二脉冲宽度调制信号生成所述第一预定数量个所述控制信号。
PCT/CN2014/086640 2014-09-02 2014-09-16 光源驱动电路及方法 Ceased WO2016033828A1 (zh)

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