WO2023024454A1 - 驱动电路、驱动方法和电子价签系统 - Google Patents

驱动电路、驱动方法和电子价签系统 Download PDF

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Publication number
WO2023024454A1
WO2023024454A1 PCT/CN2022/076934 CN2022076934W WO2023024454A1 WO 2023024454 A1 WO2023024454 A1 WO 2023024454A1 CN 2022076934 W CN2022076934 W CN 2022076934W WO 2023024454 A1 WO2023024454 A1 WO 2023024454A1
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WIPO (PCT)
Prior art keywords
circuit
voltage
pulse width
width modulation
electrically connected
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PCT/CN2022/076934
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English (en)
French (fr)
Inventor
陈银浩
白峰
Original Assignee
京东方数字科技有限公司
Priority date (The priority date 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 date listed.)
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Application filed by 京东方数字科技有限公司 filed Critical 京东方数字科技有限公司
Priority to CN202280000226.4A priority Critical patent/CN116917973A/zh
Priority to PCT/CN2022/076934 priority patent/WO2023024454A1/zh
Publication of WO2023024454A1 publication Critical patent/WO2023024454A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters

Definitions

  • the present disclosure relates to the field of lighting driving technology, and in particular to a driving circuit, a driving method and an electronic price tag system.
  • the input voltage provided by the power supply circuit is boosted by the booster circuit to obtain an output voltage, and the load (the load includes a light-emitting element) is driven by the output voltage to drive the light-emitting element to emit light .
  • the related drive circuit cannot control the luminance of the light-emitting elements included in the load to be constant when the input voltage provided by the power supply circuit changes.
  • an embodiment of the present disclosure provides a driving circuit for driving a load
  • the load includes a light-emitting element
  • the driving circuit includes a power supply circuit, a boost circuit, a pulse width modulation signal supply circuit, and a control circuit;
  • the input end of the boost circuit is electrically connected to the power circuit, and the output end of the boost circuit is electrically connected to the load;
  • the power supply circuit is used to provide an input voltage for the input terminal of the boost circuit
  • the pulse width modulation signal supply circuit is electrically connected to the boost circuit, and is used to provide a pulse width modulation signal for the boost circuit;
  • the boost circuit is used to boost the input voltage according to the pulse width modulation signal to obtain an output voltage, and drive the load through the output voltage;
  • the control circuit is electrically connected to the booster circuit, and is used to provide a duty ratio adjustment signal to the pulse width modulation signal supply circuit according to the input voltage or the output voltage, and control the pulse width modulation signal supply circuit according to The duty cycle adjustment signal adjusts the duty cycle of the pulse width modulation signal.
  • control circuit includes a detection circuit and a main control circuit
  • the detection circuit is electrically connected to the input terminal of the boost circuit and the main control circuit respectively, and is used to detect the input voltage and provide the input voltage to the main control circuit;
  • a look-up table is pre-stored in the main control circuit; the corresponding relationship between the voltage value of the input voltage and the duty cycle is stored in the look-up table;
  • the main control circuit is electrically connected to the pulse width modulation signal supply circuit, and is used to search the corresponding duty cycle in the look-up table according to the voltage value of the input voltage, and provide the pulse width modulation signal supply circuit with Provide the corresponding duty cycle adjustment signal.
  • control circuit includes a detection circuit and a main control circuit
  • the detection circuit is electrically connected to the output terminal of the boost circuit and the main control circuit respectively, and is used to detect the output voltage and provide the output voltage to the main control circuit;
  • the main control circuit is used to compare the voltage value of the output voltage with the output voltage threshold value, and provide a corresponding duty cycle adjustment signal to the pulse width modulation signal supply circuit according to the comparison result.
  • control circuit includes a voltage divider circuit, a first digital input and output interface, and a main control circuit; the first digital input and output interface and the main control circuit are integrated in a controller;
  • the voltage divider circuit is used to divide the output voltage to obtain a divided voltage, and provide the divided voltage to the first digital input and output interface;
  • the main control circuit is electrically connected to the first digital input and output interface and the pulse width modulation signal supply circuit, and is used to supply the pulse width modulation signal to the pulse width modulation signal according to the voltage signal provided by the first digital input and output interface.
  • the providing circuit provides a corresponding duty ratio adjustment signal.
  • control circuit includes a voltage divider circuit, a comparator and a main control circuit;
  • the voltage dividing circuit is used to divide the output voltage to obtain a divided voltage, and provide the divided voltage to the non-inverting input terminal of the comparator;
  • the inverting input terminal of the comparator is electrically connected to the reference voltage terminal, the output terminal of the comparator is electrically connected to the main control circuit, and the comparator is used to compare the voltage value of the divided voltage with the reference voltage terminal.
  • the reference voltage provided by the voltage terminal outputs the corresponding voltage signal according to the comparison result;
  • the main control circuit is used to provide a corresponding duty cycle adjustment signal to the pulse width modulation signal supply circuit according to the voltage signal.
  • the pulse width modulation signal supply circuit, the main control circuit and the comparator are integrated in a controller; or,
  • the driving circuit also includes a second digital input and output interface; the pulse width modulation signal supply circuit, the main control circuit and the second digital input and output interface are integrated in the controller, and the comparator is set in the External to the controller; the output terminal of the comparator is electrically connected to the main control circuit through the second digital input and output interface.
  • the voltage dividing circuit includes a first resistor and a second resistor
  • the first end of the first resistor is electrically connected to the output end, and the second end of the first resistor is electrically connected to the first end of the second resistor;
  • the second end of the second resistor is electrically connected to the first voltage end.
  • the load includes a third resistor and a light emitting unit; the first end of the third resistor is electrically connected to the output end of the boost circuit, and the second end of the third resistor is connected to the light emitting unit The first end of the light-emitting unit is electrically connected to the second end of the light-emitting unit and the first voltage end is electrically connected;
  • the light-emitting unit includes a light-emitting element, the first pole of the light-emitting element is the first end of the light-emitting unit, and the second pole of the light-emitting element is the second end of the light-emitting unit; or, the light-emitting unit includes N light emitting elements, the first pole of the first light emitting element is at the first end of the light emitting unit, the first pole of the nth light emitting element is electrically connected with the second pole of the n-1th light emitting element, and the first pole of the Nth light emitting element is electrically connected to the second pole of the nth light emitting element.
  • the diode is the second end of the light emitting unit; N is an integer greater than 1, and n is an integer greater than 1 but less than or equal to N.
  • the drive circuit described in at least one embodiment of the present disclosure further includes an on-off control circuit and a switch circuit; the second terminal of the light emitting unit is electrically connected to the first voltage terminal through the switch circuit;
  • the control terminal of the switch circuit is electrically connected to the on-off control circuit
  • the on-off control circuit is used to provide an on-off control signal or an off-control signal to the control terminal of the switch circuit, so as to control the switch circuit to turn on or off the second end of the light-emitting unit and the first connection between the voltage terminals.
  • control circuit includes a main control circuit
  • drive circuit further includes a third digital input and output interface, a fourth resistor and a switch circuit
  • main control circuit and the third digital input and output interface are integrated into a control In the device
  • the third digital input and output interface is electrically connected to the first end of the fourth resistor
  • the second end of the fourth resistor is electrically connected to the control end of the switch circuit
  • the first end of the light emitting unit The two terminals are electrically connected to the first voltage terminal through the switch circuit;
  • the main control circuit is used to provide an on control signal or an off control signal to the control terminal of the switch circuit through the third digital input and output interface and the fourth resistor, so as to control the switch circuit to be turned on or Disconnecting the connection between the second end of the light emitting unit and the first voltage end.
  • the boost circuit includes a first diode, a second diode and a first capacitor;
  • the anode of the first diode is electrically connected to the input terminal of the booster circuit
  • the cathode of the first diode is electrically connected to the anode of the second diode
  • the second diode The cathode of the booster circuit is electrically connected to the output terminal
  • the first end of the first capacitor is electrically connected to the cathode of the first diode, and the second end of the first capacitor is electrically connected to the output end of the pulse width modulation signal supply circuit;
  • the pulse width modulation signal supply circuit outputs the pulse width modulation signal through its output terminal.
  • the boost circuit further includes a first filter capacitor; the first end of the first filter capacitor is electrically connected to the output end of the boost circuit, and the second end of the first filter capacitor is connected to the first filter capacitor. A voltage terminal is electrically connected.
  • the boost circuit includes an A-level boost sub-circuit; A is an integer greater than 1;
  • the a-th step-up sub-circuit includes a 2a-1 diode, a 2a diode, an a-th capacitor, and an a-th filter capacitor; a is a positive integer less than or equal to A;
  • the anode of the 2a-1th diode is electrically connected to the ath input node, and the cathode of the 2a-1th diode is electrically connected to the ath intermediate node;
  • the anode of the 2a diode is electrically connected to the a-th intermediate node, and the cathode of the 2a-th diode is electrically connected to the a-th output node;
  • the first input node is the input end of the boost circuit
  • the Ath output node is the output end of the boost circuit
  • the bth input node is the b-1th output node
  • b is an integer greater than 1 but less than or equal to A .
  • the boost circuit further includes A filter capacitors
  • a first end of the a-th filter capacitor is electrically connected to the a-th output node, and a second end of the a-th filter capacitor is electrically connected to the first voltage end.
  • the power supply circuit includes a battery
  • the positive pole of the battery is electrically connected to the input terminal of the boost circuit, and the negative pole of the battery is electrically connected to the first voltage terminal.
  • an embodiment of the present disclosure provides a driving method for driving a load, the load includes a light-emitting element, and is applied to the above-mentioned driving circuit, and the driving method includes:
  • the power supply circuit provides an input voltage for the input terminal of the boost circuit
  • the pulse width modulation signal supply circuit provides a pulse width modulation signal for the boost circuit
  • the boost circuit boosts the input voltage according to the pulse width modulation signal to obtain an output voltage, and drives the load through the output voltage;
  • the control circuit provides a duty cycle adjustment signal to the pulse width modulation signal supply circuit according to the input voltage or the output voltage, and controls the pulse width modulation signal supply circuit to adjust the pulse width modulation signal supply circuit according to the duty cycle adjustment signal.
  • the duty cycle of the pulse width modulated signal is a signal that is generated by the pulse width modulation signal.
  • a look-up table is pre-stored in the control circuit, and the look-up table stores the correspondence between the voltage value of the input voltage and the duty ratio;
  • the control circuit provides a duty ratio adjustment signal to the pulse width modulation signal supply circuit according to the input voltage or the output voltage, and controls the pulse width modulation signal supply circuit to adjust according to the duty ratio adjustment signal.
  • the duty ratio step of the pulse width modulation signal comprises:
  • the control circuit looks up the corresponding duty cycle in the look-up table according to the voltage value of the input voltage, and provides a corresponding duty cycle adjustment signal to the pulse width modulation signal supply circuit, so that the pulse width
  • the modulation signal supply circuit adjusts the duty ratio of the pulse width modulation signal provided according to the duty ratio adjustment signal.
  • control circuit provides a duty cycle adjustment signal to the pulse width modulation signal supply circuit according to the input voltage or the output voltage, and controls the pulse width modulation signal supply circuit according to the duty cycle Adjusting the signal, the step of adjusting the duty ratio of the pulse width modulation signal includes:
  • the control circuit compares the voltage value of the output voltage with an output terminal voltage threshold
  • control circuit determines that the voltage value of the output voltage is higher than the output voltage threshold, the control circuit controls the pulse width modulation signal supply circuit to decrease the duty ratio step by step until the output voltage The voltage value is reduced to the ideal output voltage range;
  • control circuit determines that the voltage value of the output voltage is lower than the output voltage value threshold, the control circuit controls the pulse width modulation signal supply circuit to increase the duty ratio step by step until the The voltage value of the output voltage is raised to within the range of the ideal output voltage value.
  • an embodiment of the present disclosure provides an electronic price tag system, including a load and the above-mentioned driving circuit;
  • the load includes a light emitting element, and the driving circuit is used to drive the load.
  • the electronic price tag system described in at least one embodiment of the present disclosure further includes a communication unit, a controller, and an electronic ink screen;
  • the communication unit is used to receive a price tag information update signal, and provide the price tag information update signal to the controller, and the communication unit is also used to receive a light-emitting indication signal, and provide the light-emitting indication signal to The controller; the price tag information update signal carries updated price tag information;
  • the controller is configured to control the drive circuit to drive the light-emitting element to emit light when receiving the price tag information update signal, and to transmit the price tag information update signal to
  • the carried price tag information is displayed on the electronic ink screen, and is used to control the driving circuit to drive the light-emitting element to emit light when the light-emitting indication signal is received.
  • FIG. 1 is a structural diagram of a driving circuit described in at least one embodiment of the present disclosure
  • Fig. 2 is a structural diagram of a driving circuit according to at least one embodiment of the present disclosure
  • Fig. 3 is a structural diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 4 is a structural diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 5 is a structural diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 6 is a structural diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 7 is a structural diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 8 is a structural diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 9 is a structural diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 10 is a structural diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 11 is a structural diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 12 is a circuit diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • FIG. 13A is a simulation waveform diagram of the voltage value Va of the pulse width modulation signal provided by the pulse width modulation signal supply circuit P2 when at least one embodiment of the driving circuit shown in FIG. 12 of the present disclosure is working;
  • FIG. 13B is a simulation waveform diagram of the potential Vn1 of the first node N1 when at least one embodiment of the driving circuit shown in FIG. 12 of the present disclosure is working;
  • FIG. 13C is a simulation waveform diagram of the voltage value V02 of the output voltage V2 when at least one embodiment of the driving circuit shown in FIG. 12 of the present disclosure is working;
  • Fig. 14 is a circuit diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • FIG. 15A is a simulation waveform diagram of the voltage value Va of the pulse width modulation signal provided by the pulse width modulation signal supply circuit P2 when at least one embodiment of the drive circuit shown in FIG. 14 of the present disclosure is in operation;
  • FIG. 15B is a simulation waveform diagram of the potential Vn1 of the first node N1 when at least one embodiment of the driving circuit shown in FIG. 14 of the present disclosure is working;
  • FIG. 15C is a simulation waveform diagram of the voltage value V02 of the output voltage V2 when at least one embodiment of the driving circuit shown in FIG. 14 of the present disclosure is working;
  • Fig. 16 is a circuit diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 17 is a circuit diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 18 is a circuit diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 19 is a circuit diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 20 is a circuit diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 21 is a circuit diagram of a driving circuit according to at least one embodiment of the present disclosure.
  • Fig. 22 is a structural diagram of an electronic price tag system according to at least one embodiment of the present disclosure.
  • Fig. 23 is a structural diagram of an electronic price tag system according to at least one embodiment of the present disclosure.
  • the drive circuit described in the embodiment of the present disclosure is used to drive a load, the load includes a light-emitting element, and the drive circuit includes a power supply circuit, a boost circuit, a pulse width modulation signal supply circuit and a control circuit; the input of the boost circuit The terminal is electrically connected to the power circuit, and the output terminal of the boost circuit is electrically connected to the load;
  • the power supply circuit is electrically connected to the input terminal of the boost circuit, and is used to provide an input voltage for the input terminal of the boost circuit;
  • the pulse width modulation signal supply circuit is electrically connected to the boost circuit, and is used to provide a pulse width modulation signal for the boost circuit;
  • the boost circuit is electrically connected to the load, and is used to boost the input voltage according to the pulse width modulation signal to obtain an output voltage, and drive the load through the output voltage;
  • the control circuit is electrically connected to the booster circuit, and is used to provide a duty ratio adjustment signal to the pulse width modulation signal supply circuit according to the input voltage or the output voltage, and control the pulse width modulation signal supply circuit according to The duty cycle adjustment signal adjusts the duty cycle of the pulse width modulation signal so that the effective value of the output voltage is constant.
  • the drive circuit described in the embodiments of the present disclosure is added with the pulse width modulation signal supply circuit and the control circuit, and the control circuit controls the
  • the pulse width modulation signal supply circuit correspondingly adjusts the duty cycle of the pulse width modulation signal it generates, so that when the input voltage provided by the power supply circuit changes, the effective value of the output voltage can also be kept constant, and the load can be controlled
  • the luminous brightness of the included light-emitting elements is constant.
  • the constant effective value of the output voltage may refer to: the effective value of the output voltage does not change much, and the absolute value of the change in the effective value of the output voltage is less than or equal to the voltage Variation threshold; for example, the voltage variation threshold may be less than or equal to 0.1V, but not limited thereto.
  • the luminous brightness of the light-emitting element being constant refers to: the luminous luminance of the light-emitting element does not change much; the variation of the luminous brightness of the light-emitting element is less than or equal to a brightness variation threshold;
  • the brightness variation threshold may be less than or equal to 0.3 nit (nit), but not limited thereto.
  • the driving circuit described in the embodiments of the present disclosure can ensure that the luminous brightness of the light-emitting element is constant when the input voltage provided by the power supply circuit changes. Control the light emitting brightness of the light emitting element to be constant.
  • the driving circuit described in the embodiments of the present disclosure can control the duty cycle of the pulse width modulation signal provided by the pulse width modulation signal supply circuit according to the input voltage or the output voltage through the control circuit, thereby controlling the The output voltage can be maintained at just the intensity that can control the luminous intensity of the light-emitting element, thereby improving the power conversion efficiency.
  • the duty ratio of the pulse width modulation signal is fixed, then when the input voltage is fixed, the output voltage is fixed, and when the output voltage is greater than the conduction voltage of the light emitting element, the excess voltage It will be consumed in the resistance included in the load, so the power conversion efficiency of the related driving circuit is low.
  • the driving circuit described in at least one embodiment of the present disclosure is used to drive a load, and the load includes a light emitting element. As shown in FIG. 1 , the driving circuit described in at least one embodiment of the present disclosure includes a power supply circuit 11, a boost circuit 12, A pulse width modulation signal supply circuit P1 and a control circuit 14;
  • the input terminal of the boost circuit 12 is electrically connected to the power supply circuit 11, and the output terminal of the boost circuit 12 is electrically connected to the load 15;
  • the power supply circuit 11 is electrically connected to the input terminal of the boost circuit 12 for providing an input voltage V1 to the input terminal of the boost circuit 12;
  • the pulse width modulation signal supply circuit P1 is electrically connected to the boost circuit 12 for providing a pulse width modulation signal for the boost circuit 12;
  • the boost circuit 12 is electrically connected to the load 15, and is used to boost the input voltage V1 according to the pulse width modulation signal to obtain an output voltage V2, and drive the load 15;
  • the control circuit 14 is electrically connected to the input terminal of the booster circuit 12, and is used to provide a duty cycle adjustment signal to the pulse width modulation signal supply circuit P1 according to the input voltage V1, and control the pulse width modulation signal supply circuit P1
  • the circuit P1 adjusts the duty ratio of the pulse width modulation signal according to the duty ratio adjustment signal, so that the effective value of the output voltage is constant.
  • control circuit 14 provides a duty ratio adjustment signal to the pulse width modulation signal supply circuit P1 according to the input voltage V1;
  • the control circuit 14 may provide the pulse width modulation signal supply circuit P1 with a first duty cycle indicating to increase the duty cycle.
  • the duty ratio adjustment signal is sent to the boost circuit 12, and the pulse width modulation signal supply circuit P1 adjusts the duty ratio of the pulse width modulation signal provided according to the first duty ratio adjustment signal, and the boost
  • the voltage circuit 12 increases the voltage value of the output voltage V2 according to the pulse width modulation signal, so that the voltage value of the output voltage V2 reaches the output voltage value threshold;
  • the control circuit 14 may provide the pulse width modulation signal supply circuit P1 with a second duty cycle indicating to lower the duty cycle.
  • the duty cycle adjustment signal is sent to the boost circuit 12, and the pulse width modulation signal supply circuit P1 lowers the duty cycle of the pulse width modulation signal provided according to the second duty cycle adjustment signal, and the boost
  • the voltage circuit 12 lowers the voltage value of the output voltage V2 according to the pulse width modulation signal, so that the voltage value of the output voltage V2 drops to the output voltage threshold.
  • the input voltage threshold may be, for example, greater than or equal to 1.8V and less than or equal to 3V, but not limited thereto; for example, the input voltage threshold may be 1.8V, 2V, 2.5V, 2.8V or 3V.
  • the light-emitting element included in the load 15 can be an LED (light-emitting diode), and the LED can be directly driven by a PWM signal (pulse width modulation signal).
  • the luminous brightness of the LED is related to the effective output voltage The value is directly related; by changing the duty ratio of the pulse width modulation signal, the effective value of the output voltage can be adjusted, and then the luminous brightness of the LED can be adjusted.
  • the duty ratio of the pulse width modulation signal and the effective value of the output voltage do not simply change according to a proportional coefficient.
  • the effective value of the output voltage is related to the duty ratio and the load size It is related to the voltage drop of the diode and so on.
  • the method for ensuring constant luminous brightness of the light-emitting element is as follows when the input voltage changes:
  • the input voltage provided by the power supply circuit 11 is first collected, and a look-up table is set according to the collection result, and the corresponding relationship between the voltage value of the input voltage and the duty cycle is stored in the look-up table; For example, if it is detected that the voltage value of the input voltage is a high value, then the queried duty cycle is a low value; if it is detected that the voltage value of the input voltage is a low value, then the queried duty cycle is a high value value.
  • the principle of setting the duty cycle is: not only to meet the luminous intensity requirements of the light-emitting element, but also to reduce the voltage value of the output voltage as much as possible to reduce unnecessary loss.
  • the driving circuit drives the light-emitting element to emit light
  • the corresponding duty ratio is found in the lookup table according to the voltage value of the input voltage
  • the pulse width modulation signal supply circuit P1 sends out a pulse width modulation signal according to the duty ratio
  • the boost circuit 12 boosts the input voltage according to the pulse width modulation signal to obtain an output voltage, and drives the light-emitting element to light up with a desired luminous intensity through the output voltage.
  • the power supply circuit 11 When setting the look-up table, the power supply circuit 11 outputs input voltages with different voltage values to the input terminal of the boost circuit 12, and the control circuit 14 controls the pulse width modulation signal supply circuit P1 Adjust the duty ratio of the pulse width modulation signal provided by it, and after each adjustment of the duty ratio, collect the voltage value of the output voltage, record when the voltage value of the output voltage is the output voltage value threshold, Corresponding to the duty cycle, recording the corresponding relationship between the voltage value of the input voltage and the duty cycle in the look-up table.
  • the drive circuit described in at least one embodiment of the present disclosure is used to drive a load, and the load includes a light emitting element.
  • the drive circuit described in at least one embodiment of the present disclosure includes a power supply circuit 11, a boost circuit 12, A pulse width modulation signal supply circuit P1 and a control circuit 14;
  • the input terminal of the boost circuit 12 is electrically connected to the power supply circuit 11, and the output terminal of the boost circuit 12 is electrically connected to the load 15;
  • the power supply circuit 11 is electrically connected to the input terminal of the boost circuit 12 for providing an input voltage V1 to the input terminal of the boost circuit 12;
  • the pulse width modulation signal supply circuit P1 is electrically connected to the boost circuit 12 for providing a pulse width modulation signal for the boost circuit 12;
  • the output terminal of the boost circuit 12 is electrically connected to the load 15, and is used to boost the input voltage V1 according to the pulse width modulation signal to obtain an output voltage V2, and pass the output voltage V2 driving the load 15;
  • the control circuit 14 is electrically connected to the output terminal of the booster circuit 12, and is used to provide a duty ratio adjustment signal to the pulse width modulation signal supply circuit P1 according to the output voltage V2, so as to control the pulse width modulation
  • the signal supply circuit P1 adjusts the duty ratio of the pulse width modulation signal according to the duty ratio adjustment signal, so that the effective value of the output voltage is constant.
  • control circuit 14 controls the pulse width modulation signal supply circuit to adjust the duty cycle according to the voltage value of the output voltage V2;
  • the control circuit 14 may provide the pulse width modulation signal supply circuit P1 with a third duty cycle indicating to increase the duty cycle.
  • the duty cycle adjustment signal is sent to the boost circuit 12, and the pulse width modulation signal supply circuit P1 adjusts the duty cycle of the pulse width modulation signal provided according to the third duty cycle adjustment signal, and the boost
  • the voltage circuit 12 increases the voltage value of the output voltage V2 according to the pulse width modulation signal;
  • the control circuit 14 may provide the pulse width modulation signal supply circuit P1 with a fourth duty cycle indicating to lower the duty cycle.
  • the duty cycle adjustment signal is sent to the boost circuit 12, and the pulse width modulation signal supply circuit P1 lowers the duty cycle of the pulse width modulation signal provided according to the second duty cycle adjustment signal, and the boost The voltage circuit 12 increases the voltage value of the output voltage V2 according to the pulse width modulation signal.
  • the control circuit 14 controls and adjusts the duty cycle of the pulse width modulation signal according to the voltage value of the output voltage V2.
  • the duty cycle The ratio adjustment strategy is changed from the look-up table method to the feedback method, that is, the control circuit 14 collects the output voltage in real time, and a desired ideal voltage value is built into the program (the ideal voltage value is the output voltage value threshold), and the ideal The voltage value can not only ensure the luminous intensity of the light-emitting element, but also consider the luminous efficiency to minimize unnecessary loss.
  • the control circuit 14 determines that the voltage value of the output voltage is higher than the output voltage value threshold, the control circuit 14 controls the pulse width modulation signal supply circuit P1 to decrease the duty ratio step by step, until the voltage value of the output voltage drops to the ideal output voltage range; when the control circuit 14 judges that the voltage value of the output voltage is lower than the output voltage value threshold, the control circuit 14 controls the The pulse width modulation signal supply circuit P1 increases the duty cycle step by step until the voltage value of the output voltage increases to within the range of the ideal output voltage value. This adjustment process can be completed within ten milliseconds to hundreds of milliseconds, and has little effect on the indication effect of the light emitting element.
  • the light-emitting element when the voltage value of the output voltage is within the range of the ideal output voltage value, the light-emitting element can emit light with high luminous efficiency, and the voltage value of the output voltage is equal to the threshold value of the output voltage value
  • the absolute value of the difference between them is less than or equal to a predetermined difference, for example, the predetermined difference may be 0.05V, but not limited thereto.
  • the ideal output voltage range may be greater than or equal to 3.15V and less than or equal to 3.25V, and the threshold value of the output voltage value may be 3.2V, but this is not a limitation. limit.
  • the step of each adjustment when the pulse width modulation signal supply circuit P1 decreases the duty cycle step by step, or increases the duty cycle step by step, the step of each adjustment can be greater than or equal to 0.5% but less than or equal to 1%, but not limited thereto. Theoretically, the smaller the step of each adjustment, the better, but in actual operation, the step needs to be determined according to the performance of the actually used controller.
  • the control circuit includes a detection circuit 31 and a main control circuit P2;
  • the detection circuit 31 is electrically connected to the input terminal of the boost circuit 12 and the main control circuit P2 respectively, and is used to detect the input voltage V1 and provide the input voltage V1 to the main control circuit P2 ;
  • a look-up table is pre-stored in the main control circuit P2; the look-up table stores the correspondence between the voltage value of the input voltage and the duty cycle;
  • the main control circuit P2 is electrically connected to the pulse width modulation signal supply circuit P1, and is used to search the corresponding duty cycle in the look-up table according to the voltage value of the input voltage, and provide the pulse width modulation signal
  • the providing circuit P1 provides a corresponding duty ratio adjustment signal, so that the pulse width modulation signal providing circuit P1 adjusts the duty ratio of the provided pulse width modulation signal according to the duty ratio adjustment signal.
  • the detection circuit 31 may be an ADC (Analog-to-Digital Converter), and the main control circuit P2 may be a CPU (Central Processing Unit), but not limited thereto.
  • ADC Analog-to-Digital Converter
  • CPU Central Processing Unit
  • the control circuit includes a detection circuit 31 and a main control circuit P2;
  • the detection circuit 31 is electrically connected to the output terminal of the booster circuit 12 and the main control circuit P2, respectively, for detecting the output voltage V2, and providing the output voltage V2 to the main control circuit P2 ;
  • the main control circuit P2 is used to compare the voltage value of the output voltage V2 with the output voltage threshold value, and provide a corresponding duty ratio adjustment signal to the pulse width modulation signal supply circuit P1 according to the comparison result.
  • the detection circuit 31 detects the output voltage V2, and the main control circuit P2 compares the voltage value of the output voltage V2 with the output voltage value threshold, and when the comparison result indicates that the voltage value of the output voltage V2 is less than the output voltage value threshold, the main control circuit P2 provides a corresponding duty ratio adjustment signal to the pulse width modulation signal supply circuit P1 , so as to control the pulse width modulation signal supply circuit P1 to gradually reduce the duty ratio of the pulse width modulation signal it provides until the voltage value of the output voltage V2 falls within the range of the ideal output voltage value; when the When the comparison result indicates that the voltage value of the output voltage V2 is greater than the output voltage value threshold, the main control circuit P2 provides a corresponding duty ratio adjustment signal to the pulse width modulation signal supply circuit P1 to control the The pulse width modulation signal supply circuit P1 increases the duty cycle of the pulse width modulation signal provided by it step by step until the voltage value of the output voltage V2 increases to within
  • the first digital input and output interface I1 and the main control circuit P2 are integrated in the controller M1;
  • the voltage dividing circuit 51 is used to divide the output voltage V2 to obtain a divided voltage V0, and provide the divided voltage V0 to the first digital input and output interface I1;
  • the main control circuit P2 is electrically connected to the first digital input and output interface I1 and the pulse width modulation signal supply circuit P1, and is used to provide the voltage signal to the first digital input and output interface I1 according to the voltage signal provided by the first digital input and output interface I1
  • the pulse width modulation signal supply circuit P1 provides a corresponding duty cycle adjustment signal.
  • the power supply circuit 11 can provide the controller M1 with an input voltage V1 to supply power to the controller M1.
  • the voltage divider circuit 51 divides the output voltage V2 to obtain a divided voltage V0, and provides the divided voltage V0 to To the first digital input and output interface I1, when the voltage value of the divided voltage V0 is greater than a predetermined voltage value, the voltage signal provided by the first digital input and output interface I1 to the main control circuit P2 is a high voltage signal, when the voltage value of the divided voltage V0 is less than the predetermined voltage value, the voltage signal provided by the first digital input and output interface I1 to the main control circuit P2 is a low voltage signal; the main control circuit P2 is used to provide the pulse width modulation signal supply circuit P1 with a duty cycle adjustment signal indicating to lower the duty cycle when the first digital input and output interface I1 provides a high voltage signal, and is used to when the When the first digital input and output interface I1 provides a low voltage signal, it provides the pulse width modulation signal supply circuit P1 with a duty cycle adjustment signal indicating to increase the duty
  • the pulse width modulation signal supply circuit P1 when providing the pulse width modulation signal supply circuit P1 with a duty cycle adjustment signal indicating to reduce the duty cycle, the pulse width modulation signal supply circuit P1 can gradually reduce the duty cycle Duty ratio: when providing the pulse width modulation signal supply circuit P1 with a duty ratio adjustment signal indicating to increase the duty ratio, the pulse width modulation signal supply circuit P1 can gradually increase the duty ratio .
  • the predetermined voltage value can be set according to the model of the controller, for example, the predetermined voltage value can be 1.6V, 1.8V, 2V or 2.5V, but not limit.
  • the main control circuit P2 may be a CPU
  • the controller may be an MCU (micro control unit)
  • the MCU may be a low-voltage controller
  • at least one embodiment of the present disclosure does not use
  • the triode is used to increase the driving current, so at least one embodiment of the present disclosure can normally drive the light-emitting element to emit light under low voltage.
  • the voltage dividing circuit includes a first resistor and a second resistor
  • the first end of the first resistor is electrically connected to the output end of the boost circuit, and the second end of the first resistor is electrically connected to the first end of the second resistor;
  • the second end of the second resistor is electrically connected to the first voltage end.
  • the first voltage terminal may be a ground terminal or a low voltage terminal, but not limited thereto.
  • the divided voltage obtained by the voltage dividing circuit can just be recognized as a high voltage signal by the first digital input and output interface, and on this basis, after the duty ratio of one level is lowered, the divided voltage obtained by the voltage dividing circuit Voltage is recognized as a low-voltage signal by the first digital input and output interface, but at this time the output voltage provided by the boost circuit can still drive the light-emitting element to emit light, and the voltage value of the output voltage is within the ideal output voltage value within range.
  • control circuit may include a voltage divider circuit 51, a comparator P3 and a main control circuit P2;
  • the voltage divider circuit 51 is used to divide the output voltage V2 to obtain a divided voltage V0, and provide the divided voltage V0 to the non-inverting input terminal of the comparator P3;
  • the inverting input terminal of the comparator P3 is electrically connected to the reference voltage terminal R1, the output terminal of the comparator P3 is electrically connected to the main control circuit P2, and the comparator P3 is used to compare the divided voltage V0 The voltage value and the reference voltage Vref provided by the reference voltage terminal R1, output a corresponding voltage signal according to the comparison result;
  • the main control circuit P2 is configured to provide a corresponding duty ratio adjustment signal to the pulse width modulation signal supply circuit P1 according to the voltage signal.
  • the comparator P3 when the voltage value of the divided voltage V0 is greater than the reference voltage Vref, the comparator P3 outputs a high voltage signal, and when the When the voltage value of the divided voltage V0 is less than the reference voltage Vref, the comparator P3 outputs a low voltage signal;
  • the main control circuit P2 When the comparator P3 outputs a high voltage signal, the main control circuit P2 provides the pulse width modulation signal supply circuit P1 with a duty cycle adjustment signal indicating to lower the duty cycle to control the pulse width modulation signal Provide circuit P1 to gradually reduce the duty cycle of the pulse width modulation signal it provides;
  • the main control circuit P2 When the comparator P3 outputs a low voltage signal, the main control circuit P2 provides a duty cycle adjustment signal indicating to increase the duty cycle to the pulse width modulation signal supply circuit P1 to control the pulse width modulation signal
  • the supply circuit P1 gradually increases the duty cycle of the pulse width modulation signal it provides.
  • the voltage dividing circuit includes a first resistor and a second resistor
  • the first end of the first resistor is electrically connected to the output end of the boost circuit, and the second end of the first resistor is electrically connected to the first end of the second resistor;
  • the second end of the second resistor is electrically connected to the first voltage end.
  • the first voltage terminal may be a ground terminal or a low voltage terminal, but not limited thereto.
  • the resistance value of the second resistor can be selected according to the actual situation, so that when the voltage value of the output voltage V2 is the threshold value of the output voltage value, the comparator P3 can output a high voltage signal, and on this basis, it will be lowered by one level After the duty cycle of the pulse width modulation signal, the comparator P3 outputs a low voltage signal, and at this time the output voltage V2 provided by the booster circuit 12 can still drive the light emitting element to emit light, the output voltage The voltage value is within the ideal output voltage range.
  • the pulse width modulation signal supply circuit, the main control circuit and the comparator are integrated in a controller; or,
  • the driving circuit also includes a second digital input and output interface; the pulse width modulation signal supply circuit, the main control circuit and the second digital input and output interface are integrated in the controller, and the comparator is set in the External to the controller; the output terminal of the comparator is electrically connected to the main control circuit through the second digital input and output interface.
  • the pulse width modulation signal supply circuit P1, the main control circuit P2 and the comparator P3 can be integrated in the controller In M1, the number of devices used can be reduced.
  • the power supply circuit 11 can provide the controller M1 with an input voltage V1 to supply power to the controller M1.
  • the driving circuit further includes a second digital input and output interface I2; the pulse width modulation signal supply circuit P1, the main The control circuit P2 and the second digital input and output interface I2 are integrated in the controller M1, and the comparator P3 is arranged outside the controller M1; the output terminal of the comparator P3 passes through the second digital input and output The interface I2 is electrically connected to the main control circuit P2.
  • the power supply circuit 11 can provide the controller M1 with an input voltage V1 to supply power to the controller M1.
  • the comparator P3 when at least one embodiment of the driving circuit shown in FIG. 8 of the present disclosure is working, when the voltage value of the divided voltage V0 is greater than the reference voltage Vref, the comparator P3 outputs a high voltage signal. When the voltage value of the voltage V0 is less than the reference voltage Vref, the comparator P3 outputs a low voltage signal;
  • the second digital input and output interface I2 provides a high voltage signal to the main control circuit P2, when the main control circuit P2 When receiving a high voltage signal, the main control circuit P2 provides a duty cycle adjustment signal indicating to lower the duty cycle to the pulse width modulation signal supply circuit P1, so as to control the pulse width modulation signal supply circuit P1 step by step reducing the duty cycle of the pulse width modulation signal provided by it until the voltage value of the output voltage V2 falls within the range of the ideal output voltage value;
  • the second digital input and output interface I2 provides a low voltage signal to the main control circuit P2, when the main control circuit P2 When receiving a low voltage signal, the main control circuit P2 provides a duty cycle adjustment signal indicating to increase the duty cycle to the pulse width modulation signal supply circuit P1, so as to control the pulse width modulation signal supply circuit P1 step by step Increase the duty cycle of the pulse width modulation signal provided by it until the voltage value of the output voltage V2 rises to within the range of the ideal output voltage value.
  • the load includes a third resistor and a light emitting unit; the first end of the third resistor is electrically connected to the output end of the boost circuit, and the second end of the third resistor is connected to the light emitting unit The first end of the light-emitting unit is electrically connected to the second end of the light-emitting unit and the first voltage end is electrically connected;
  • the light-emitting unit includes a light-emitting element, the first pole of the light-emitting element is the first end of the light-emitting unit, and the second pole of the light-emitting element is the second end of the light-emitting unit; or, the light-emitting unit includes N light emitting elements, the first pole of the first light emitting element is at the first end of the light emitting unit, the first pole of the nth light emitting element is electrically connected with the second pole of the n-1th light emitting element, and the first pole of the Nth light emitting element is electrically connected to the second pole of the nth light emitting element.
  • the diode is the second end of the light emitting unit; N is an integer greater than 1, and n is an integer greater than 1 but less than or equal to N.
  • the light emitting unit may only include one light emitting element, or the light emitting unit may include a plurality of light emitting elements connected in series.
  • the drive circuit may further include an on-off control circuit and a switch circuit; the second terminal of the light emitting unit is electrically connected to the first voltage terminal through the switch circuit;
  • the control terminal of the switch circuit is electrically connected to the on-off control circuit
  • the on-off control circuit is used to provide an on-off control signal or an off-control signal to the control terminal of the switch circuit, so as to control the switch circuit to turn on or off the second end of the light-emitting unit and the first connection between voltage terminals.
  • the driving circuit may further include an on-off control circuit and a switch circuit, and the on-off control circuit controls the switch circuit to turn on or off the second terminal of the light-emitting element and the first voltage.
  • the connection between the terminals is used to control the light-emitting unit to emit light or not to emit light.
  • the drive circuit described in at least one embodiment of the present disclosure further includes an on-off control circuit 91 and a switch circuit 92;
  • the load includes The third resistor R3 and the light emitting unit 90; the first end of the third resistor R3 is electrically connected to the output end of the boost circuit 12, and the second end of the third resistor R3 is connected to the first end of the light emitting unit 90.
  • One end is electrically connected, and the second end of the light emitting unit 90 is electrically connected to the first voltage end V01 through the switch circuit 92;
  • the control end of the switch circuit 92 is electrically connected to the on-off control circuit 91;
  • the on-off control circuit 91 is used to provide an on control signal or an off control signal to the control terminal of the switch circuit 92, so as to control the switch circuit 92 to turn on or off the second terminal of the light emitting unit 90 and The connection between the first voltage terminals V01.
  • the drive circuit described in at least one embodiment of the present disclosure further includes an on-off control circuit 91 and a switch circuit 92;
  • the load includes The third resistor R3 and the light emitting unit 90; the first end of the third resistor R3 is electrically connected to the output end of the boost circuit 12, and the second end of the third resistor R3 is connected to the first end of the light emitting unit 90.
  • One end is electrically connected, and the second end of the light emitting unit 90 is electrically connected to the first voltage end V01 through the switch circuit 92;
  • the control end of the switch circuit 92 is electrically connected to the on-off control circuit 91;
  • the on-off control circuit 91 is used to provide an on control signal or an off control signal to the control terminal of the switch circuit 92, so as to control the switch circuit 92 to turn on or off the second terminal of the light emitting unit 90 and The connection between the first voltage terminals V01.
  • the first voltage terminal V01 may be a ground terminal or a low voltage terminal, but not limited thereto.
  • control circuit includes a main control circuit
  • driving circuit further includes a third digital input and output interface, a fourth resistor and a switch circuit
  • the output interface is integrated in the controller
  • the third digital input and output interface is electrically connected to the first end of the fourth resistor, and the second end of the fourth resistor is electrically connected to the control end of the switch circuit
  • the second end of the light emitting unit is electrically connected to the first voltage end through the switch circuit;
  • the main control circuit is used to provide an on control signal or an off control signal to the control terminal of the switch circuit through the third digital input and output interface and the fourth resistor, so as to control the switch circuit to be turned on or Disconnecting the connection between the second end of the light emitting unit and the first voltage end.
  • the main control circuit can provide the control terminal of the switch circuit with an on control signal or an off control signal through the third digital input and output interface and the fourth resistor, thereby controlling the switch circuit to turn on or off the
  • the connection between the second terminal of the light emitting unit and the first voltage terminal controls whether the light emitting unit emits light or not.
  • the detection circuit is an analog-to-digital converter A1
  • the drive circuit also includes a third digital input The resistor R4 and the switch circuit 92; the analog-to-digital converter A1, the main control circuit P2, the third digital input and output interface I3 and the pulse width modulation signal supply circuit P1 are integrated in the controller M1;
  • the analog-to-digital converter A1 is electrically connected to the input terminal of the boost circuit 12 and the main control circuit P2 respectively, and is used to detect the input voltage V1, and perform analog-to-digital conversion on the input voltage V1 to obtain The digital input voltage of is provided to the main control circuit P2;
  • the main control circuit P2 obtains the voltage value of the input voltage V1 according to the digital input voltage; a lookup table is pre-stored in the main control circuit P2; the voltage value of the input voltage and the value of the input voltage are stored in the lookup table The corresponding relationship between the duty ratios;
  • the main control circuit P2 is electrically connected to the pulse width modulation signal supply circuit P1, and is used to search the corresponding duty cycle in the look-up table according to the voltage value of the input voltage, and provide the pulse width modulation signal
  • the providing circuit P1 provides a corresponding duty ratio adjustment signal, so that the pulse width modulation signal providing circuit P1 adjusts the duty ratio of the provided pulse width modulation signal according to the duty ratio adjustment signal;
  • the load includes a third resistor R3 and a light emitting unit 90; the first end of the third resistor R3 is electrically connected to the output end of the boost circuit 12, and the second end of the third resistor R3 is connected to the light emitting unit 90.
  • the first terminal of the unit 90 is electrically connected, and the second terminal of the light emitting unit 90 is electrically connected to the first voltage terminal V01 through the switch circuit 92;
  • the third digital input and output interface I3 is electrically connected to the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is electrically connected to the control end of the switch circuit 92;
  • the main control circuit P2 is used to provide an on control signal or an off control signal to the control terminal of the switch circuit 92 through the third digital input and output interface I3 and the fourth resistor R4 to control the switch
  • the circuit 92 turns on or off the connection between the second terminal of the light emitting unit 90 and the first voltage terminal V01.
  • the switch circuit 92 may include a switch transistor, the control pole of the switch transistor is the control terminal of the switch circuit 92 , the first pole of the switch transistor is connected to the light emitting unit 90 The second terminal is electrically connected, and the second pole of the switching transistor is electrically connected to the first voltage terminal V01;
  • the switch transistor is an n-type transistor
  • the main control circuit P2 sends a signal to the switch transistor through the third digital input and output interface I3 and the fourth resistor R4
  • the control electrode of the control pole provides a low voltage signal to control the switching transistor to turn off and control the light emitting unit 90 not to emit light;
  • the switch transistor is an n-type transistor
  • the main control circuit P2 sends a signal to the switch transistor through the third digital input and output interface I3 and the fourth resistor R4.
  • the control electrode of the control electrode provides a high voltage signal to control the switching transistor to turn on, and control the light emitting unit 90 to emit light;
  • the switch transistor is a p-type transistor
  • the main control circuit P2 sends a signal to the switch transistor through the third digital input and output interface I3 and the fourth resistor R4
  • the control electrode of the control pole provides a high-voltage signal to control the switching transistor to turn off, and control the light-emitting unit 90 to not emit light;
  • the switch transistor is a p-type transistor
  • the main control circuit P2 sends a signal to the switch transistor through the third digital input and output interface I3 and the fourth resistor R4
  • the control electrode of the control electrode provides a low-voltage signal to control the switch transistor to be turned on and control the light emitting unit 90 to emit light.
  • the boost circuit includes a first diode, a second diode and a first capacitor;
  • the anode of the first diode is electrically connected to the input terminal of the booster circuit
  • the cathode of the first diode is electrically connected to the anode of the second diode
  • the second diode The cathode of the booster circuit is electrically connected to the output terminal
  • the first end of the first capacitor is electrically connected to the cathode of the first diode, and the second end of the first capacitor is electrically connected to the output end of the pulse width modulation signal supply circuit;
  • the pulse width modulation signal supply circuit outputs the pulse width modulation signal through its output terminal.
  • the boost circuit may further include a first filter capacitor; the first end of the first filter capacitor is electrically connected to the output end of the boost circuit, and the second end of the first filter capacitor is connected to the The first voltage end is electrically connected.
  • the boost circuit may further include a first filter capacitor for filtering, which can make the output voltage change from a pulse voltage to a smooth and stable voltage.
  • the boost circuit may include an A-level boost sub-circuit; A is an integer greater than 1;
  • the a-th step-up sub-circuit includes a 2a-1 diode, a 2a diode, an a-th capacitor, and an a-th filter capacitor; a is a positive integer less than or equal to A;
  • the anode of the 2a-1th diode is electrically connected to the ath input node, and the cathode of the 2a-1th diode is electrically connected to the ath intermediate node;
  • the anode of the 2a diode is electrically connected to the a-th intermediate node, and the cathode of the 2a-th diode is electrically connected to the a-th output node;
  • the first input node is the input end of the boost circuit
  • the Ath output node is the output end of the boost circuit
  • the bth input node is the b-1th output node
  • b is an integer greater than 1 but less than or equal to A .
  • the boost circuit may also include at least two stages of boost sub-circuits, so that the voltage value of the output voltage provided by the boost circuit is higher.
  • the output voltage provided by the booster circuit can also stably drive the light emitting element to emit light.
  • the boost circuit further includes A filter capacitors
  • a first end of the a-th filter capacitor is electrically connected to the a-th output node, and a second end of the a-th filter capacitor is electrically connected to the first voltage end.
  • the boost circuit may further include A filter capacitors for filtering, which can make the output voltage change from a pulse voltage to a smooth and stable voltage.
  • the power supply circuit includes a battery
  • the positive pole of the battery is electrically connected to the input terminal of the boost circuit, and the negative pole of the battery is electrically connected to the first voltage terminal.
  • the detection circuit is an analog-to-digital converter A1, the analog-to-digital converter A1, the pulse width modulation signal supply circuit P1 and the main control circuit P2 are integrated in the controller M1;
  • the load includes a third resistor R3 and a first light emitting diode L1; the second end of the third resistor R3 is electrically connected to the anode of the first light emitting diode L1 , the cathode of the first light emitting diode L1 is electrically connected to the ground terminal G1;
  • the power supply circuit includes a battery BT1;
  • the boost circuit 12 includes a first diode D1, a second diode D2, a first capacitor C1 and a first filter capacitor C01;
  • the anode of the first diode D1 is electrically connected to the anode of the battery BT1, the cathode of the first diode D1 is electrically connected to the anode of the second diode D2, and the second diode
  • the cathode of the tube D2 is electrically connected to the first end of the third resistor R3; the negative electrode of the battery BT1 is electrically connected to the ground terminal G1;
  • the anode of the first diode D1 is connected to the input voltage V1; the booster circuit 12 provides the output voltage V2 through the cathode of the second diode D2;
  • the first end of the first capacitor C1 is electrically connected to the cathode of the first diode D1, and the second end of the first capacitor C1 is electrically connected to the output end of the pulse width modulation signal supply circuit P1;
  • the pulse width modulation signal supply circuit P1 is configured to output the pulse width modulation signal through its output terminal;
  • the first end of the first filter capacitor C01 is electrically connected to the cathode of the second diode D2, and the second end of the first filter capacitor C01 is electrically connected to the ground terminal G1;
  • the analog-to-digital converter A1 is electrically connected to the input terminal of the boost circuit 12 and the main control circuit P2 respectively, and is used to detect the input voltage V1, and perform analog-to-digital conversion on the input voltage V1 to obtain The digital input voltage of is provided to the main control circuit P2;
  • the main control circuit P2 obtains the voltage value of the input voltage V1 according to the digital input voltage; a lookup table is pre-stored in the main control circuit P2; the voltage value of the input voltage and the value of the input voltage are stored in the lookup table The corresponding relationship between the duty ratios;
  • the main control circuit P2 is electrically connected to the pulse width modulation signal supply circuit P1, and is used to search the corresponding duty cycle in the look-up table according to the voltage value of the input voltage, and provide the pulse width modulation signal
  • the providing circuit P1 provides a corresponding duty ratio adjustment signal, so that the pulse width modulation signal providing circuit P1 adjusts the duty ratio of the provided pulse width modulation signal according to the duty ratio adjustment signal.
  • the voltage value of the input voltage V1 provided by the battery BT1 may be the input voltage value VDD, and VDD may be greater than or equal to 1.8V and less than or equal to 3V, the first The voltage drop Vf1 of the diode D1 and the voltage drop Vf2 of the second diode D2 may be 0.3V, but not limited thereto.
  • At least one embodiment of the driving circuit shown in FIG. 12 of the present disclosure has a simple structure, and can normally drive the light-emitting diode to emit light under the premise of low cost.
  • the drive circuit described in at least one embodiment of the present disclosure drives the charge on the energy storage element (capacitance included in the boost circuit) to move back and forth between the battery and the load by a pulse width modulation signal, and adjusts the The duty ratio of the pulse width modulation signal can control the voltage value of the output voltage.
  • the one labeled N1 is the first node electrically connected to the first end of the first capacitor C1 .
  • the function of the first diode D1 is to prevent the voltage change of the first node N1 from affecting the battery terminal
  • the function of the second diode D2 is to prevent the output voltage from V2 affects the energy storage of the first capacitor C1.
  • the battery BT1 can provide a power supply voltage for the controller M1, and when the voltage value of the input voltage V1 provided by the battery BT1 is the input voltage value VDD, the pulse width modulation signal provides The potential of the pulse width modulation signal provided by the circuit P1 can be switched between 0V and VDD.
  • the controller M1 may be an MCU (microcontroller), and the MCU may be a low-voltage controller.
  • the first light emitting diode L1 may be a white light emitting diode or a blue light emitting diode, but not limited thereto.
  • the first light-emitting diode L1 can also be other colored light-emitting diodes, such as red light-emitting diodes and green light-emitting diodes.
  • the voltage value Va of the pulse width modulation signal provided by the pulse width modulation signal supply circuit P2 is between 2V and 0V. transform;
  • the potential Vn1 of the first node N1 is 2VDD-Vf;
  • the output voltage V2 is transformed into a gentle and stable voltage
  • the effective value of the output voltage V2 can be adjusted.
  • the one labeled V02 is the voltage value of the output voltage V2.
  • the detection circuit is an analog-to-digital converter A1, the analog-to-digital converter A1, the pulse width modulation signal supply circuit P1 and the main control circuit P2 are integrated in the controller M1;
  • the load includes a third resistor R3 and a first light emitting diode L1; the second end of the third resistor R3 is electrically connected to the anode of the first light emitting diode L1 , the cathode of the first light emitting diode L1 is electrically connected to the ground terminal G1;
  • the power supply circuit includes a battery BT1;
  • the boost circuit 12 includes a first diode D1, a second diode D2 and a first capacitor C1;
  • the anode of the first diode D1 is electrically connected to the anode of the battery BT1, the cathode of the first diode D1 is electrically connected to the anode of the second diode D2, and the second diode
  • the cathode of the tube D2 is electrically connected to the first end of the third resistor R3; the negative electrode of the battery BT1 is electrically connected to the ground terminal G1;
  • the anode of the first diode D1 is connected to the input voltage V1; the booster circuit 12 provides the output voltage V2 through the cathode of the second diode D2;
  • the first end of the first capacitor C1 is electrically connected to the cathode of the first diode D1, and the second end of the first capacitor C1 is electrically connected to the output end of the pulse width modulation signal supply circuit P1;
  • the pulse width modulation signal supply circuit P1 is configured to output the pulse width modulation signal through its output terminal;
  • the analog-to-digital converter A1 is electrically connected to the input terminal of the boost circuit 12 and the main control circuit P2 respectively, and is used to detect the input voltage V1, and perform analog-to-digital conversion on the input voltage V1 to obtain The digital input voltage of is provided to the main control circuit P2;
  • the main control circuit P2 obtains the voltage value of the input voltage V1 according to the digital input voltage; a lookup table is pre-stored in the main control circuit P2; the voltage value of the input voltage and the value of the input voltage are stored in the lookup table The corresponding relationship between the duty ratios;
  • the main control circuit P2 is electrically connected to the pulse width modulation signal supply circuit P1, and is used to search the corresponding duty cycle in the look-up table according to the voltage value of the input voltage, and provide the pulse width modulation signal
  • the providing circuit P1 provides a corresponding duty ratio adjustment signal, so that the pulse width modulation signal providing circuit P1 adjusts the duty ratio of the provided pulse width modulation signal according to the duty ratio adjustment signal.
  • the voltage value of the input voltage V1 provided by the battery BT1 may be the input voltage value VDD, and VDD may be greater than or equal to 1.8V and less than or equal to 3V, the first The voltage drop Vf1 of the diode D1 and the voltage drop Vf2 of the second diode D2 may be 0.3V, but not limited thereto.
  • At least one embodiment of the driving circuit shown in FIG. 14 of the present disclosure has a simple structure, and can normally drive the light emitting diode to emit light under the premise of low cost and low voltage.
  • the drive circuit described in at least one embodiment of the present disclosure drives the charge on the energy storage element (capacitance included in the boost circuit) to move back and forth between the battery and the load by a pulse width modulation signal, and adjusts the The duty ratio of the pulse width modulation signal can control the voltage value of the output voltage.
  • the one labeled N1 is the first node electrically connected to the first end of the first capacitor C1 .
  • the function of the first diode D1 is to prevent the voltage change of the first node N1 from affecting the battery terminal
  • the function of the second diode D2 is to prevent the output voltage from V2 affects the energy storage of the first capacitor C1.
  • the battery BT1 can provide a power supply voltage for the controller M1, and when the voltage value of the input voltage V1 provided by the battery BT1 is the input voltage value VDD, the pulse width modulation signal provides The potential of the pulse width modulation signal provided by the circuit P1 can be switched between 0V and VDD.
  • the voltage value Va of the pulse width modulation signal provided by the pulse width modulation signal supply circuit P2 is between 2V and 0V. transform;
  • the effective value of the output voltage V2 can be adjusted.
  • the one labeled V02 is the voltage value of the output voltage V2.
  • the detection circuit is an analog-to-digital converter A1, the analog-to-digital converter A1, the pulse width modulation signal supply circuit P1 and the main control circuit P2 are integrated in the controller M1;
  • the load includes a third resistor R3 and a first light emitting diode L1; the second end of the third resistor R3 is electrically connected to the anode of the first light emitting diode L1 , the cathode of the first light emitting diode L1 is electrically connected to the ground terminal G1;
  • the power supply circuit includes a battery BT1;
  • the boost circuit 12 includes a first diode D1, a second diode D2, a first capacitor C1 and a first filter capacitor C01;
  • the anode of the first diode D1 is electrically connected to the anode of the battery BT1, the cathode of the first diode D1 is electrically connected to the anode of the second diode D2, and the second diode
  • the cathode of the tube D2 is electrically connected to the first end of the third resistor R3; the negative electrode of the battery BT1 is electrically connected to the ground terminal G1;
  • the anode of the first diode D1 is connected to the input voltage V1; the booster circuit 12 provides the output voltage V2 through the cathode of the second diode D2;
  • the first end of the first capacitor C1 is electrically connected to the cathode of the first diode D1, and the second end of the first capacitor C1 is electrically connected to the output end of the pulse width modulation signal supply circuit P1;
  • the pulse width modulation signal supply circuit P1 is configured to output the pulse width modulation signal through its output terminal;
  • the first end of the first filter capacitor C01 is electrically connected to the cathode of the second diode D2, and the second end of the first filter capacitor C01 is electrically connected to the ground terminal G1;
  • the analog-to-digital converter A1 is electrically connected to the output terminal of the boost circuit 12 and the main control circuit P2 respectively, and is used to detect the output voltage V2, and perform analog-to-digital conversion on the output voltage V2 to obtain The digital output voltage of is provided to the main control circuit P2;
  • the main control circuit P2 is used to obtain the voltage value of the output voltage V2 according to the digital output voltage, compare the voltage value of the output voltage V2 with the threshold value of the output voltage value, and provide the pulse width modulation signal according to the comparison result.
  • Circuit P1 provides a corresponding duty ratio adjustment signal.
  • the voltage value of the input voltage V1 provided by the battery BT1 may be the input voltage value VDD, and VDD may be greater than or equal to 1.8V and less than or equal to 3V, the first The voltage drop Vf1 of the diode D1 and the voltage drop Vf2 of the second diode D2 may be 0.3V, but not limited thereto.
  • the main control circuit P2 controls and adjusts the duty ratio of the pulse width modulation signal according to the voltage value of the output voltage V2.
  • the air-ratio adjustment strategy is changed from the look-up table method to the feedback method, that is, the control circuit 14 collects the output voltage in real time, and a desired ideal voltage value is built in the program (the ideal voltage value is the output voltage value threshold), and the The ideal voltage value can not only ensure the luminous intensity of the first light-emitting diode L1, but also consider the luminous efficiency to minimize unnecessary loss.
  • the main control circuit P2 determines that the voltage value of the output voltage is higher than the output voltage threshold, the main control circuit P2 controls the pulse width modulation signal supply circuit P1 to gradually reduce the duty ratio, until the voltage value of the output voltage drops to the ideal output voltage range; when the main control circuit P2 judges that the voltage value of the output voltage is lower than the output voltage value threshold, the main control circuit P2 controls the pulse width modulation signal supply circuit P1 to increase the duty ratio step by step until the voltage value of the output voltage increases to within the ideal output voltage range.
  • This adjustment process can be completed within ten milliseconds to hundreds of milliseconds, and has little effect on the indication effect of the first light emitting diode L1.
  • the load includes a third resistor R3 and a first light emitting diode L1; the second end of the third resistor R3 is connected to the The anode of the first light emitting diode L1 is electrically connected, and the cathode of the first light emitting diode L1 is electrically connected to the ground terminal G1;
  • the power supply circuit includes a battery BT1;
  • the boost circuit 12 includes a first diode D1, a second diode D2, a first capacitor C1 and a first filter capacitor C01;
  • the anode of the first diode D1 is electrically connected to the anode of the battery BT1, the cathode of the first diode D1 is electrically connected to the anode of the second diode D2, and the second diode
  • the cathode of the tube D2 is electrically connected to the first end of the third resistor R3; the negative electrode of the battery BT1 is electrically connected to the ground terminal G1;
  • the anode of the first diode D1 is connected to the input voltage V1; the booster circuit 12 provides the output voltage V2 through the cathode of the second diode D2;
  • the first end of the first capacitor C1 is electrically connected to the cathode of the first diode D1, and the second end of the first capacitor C1 is electrically connected to the output end of the pulse width modulation signal supply circuit P1;
  • the pulse width modulation signal supply circuit P1 is configured to output the pulse width modulation signal through its output terminal;
  • the first end of the first filter capacitor C01 is electrically connected to the cathode of the second diode D2, and the second end of the first filter capacitor C01 is electrically connected to the ground terminal G1;
  • the voltage dividing circuit 51 may include a first resistor R1 and a second resistor R2;
  • the first end of the first resistor R1 is electrically connected to the cathode of the second diode D2, and the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2;
  • the second terminal of the second resistor R2 is electrically connected to the ground terminal G1;
  • the first resistor R1 and the second resistor R2 divide the output voltage V2, and provide a divided voltage V0 through the second end of the first resistor R1, and provide the divided voltage V0 to the Describe the first digital input and output interface I1;
  • the main control circuit P2 is electrically connected to the first digital input and output interface I1 and the pulse width modulation signal supply circuit P1, and is used to provide the voltage signal to the first digital input and output interface I1 according to the voltage signal provided by the first digital input and output interface I1
  • the pulse width modulation signal supply circuit P1 provides a corresponding duty cycle adjustment signal.
  • At least one embodiment of the driving circuit shown in FIG. 17 of the present disclosure needs to set the resistance value of the first resistor R1 and the resistance value of the second resistor R2, and carefully calculate the resistance value of the first resistor R1 and the second resistor R2.
  • the voltage division ratio is such that when the voltage value of the output voltage V2 is the threshold value of the output voltage value, the divided voltage V0 can just be recognized as a high voltage signal by the first digital input and output interface I1, and is adjusted down on this basis After the first-stage duty cycle, the divided voltage V0 is recognized as a low-voltage signal by the first digital input and output interface I1, but at this time the output voltage V2 provided by the booster circuit 12 can still drive the first The light-emitting diode L1 emits light, and the voltage value of the output voltage V2 is within the ideal output voltage range.
  • the digital input and output interfaces of the controller M1 have relatively clear dividing points of high and low levels, and the designer needs to determine the High and low level demarcation point, and design the parameters of the voltage divider circuit based on this.
  • the high-low level boundary point may be voltage values such as 1.0V, 2.0V, 2.5V, etc., but it is not limited thereto.
  • the digital input and output interface is also required to have a small hysteresis voltage value, such as not greater than 0.2V, otherwise it will affect the constant output voltage characteristic or adjustment time.
  • the voltage signal when the voltage value of the voltage signal connected to the digital input and output interface of the controller is greater than the high-low level boundary point, the voltage signal is recognized as a high voltage by the digital input and output interface signal, when the voltage value of the voltage signal connected to the digital input and output interface of the controller is less than the high-low level boundary point, the voltage signal is recognized as a low voltage signal by the digital input and output interface.
  • At least one embodiment of the drive circuit shown in FIG. 17 of the present disclosure can first control the duty cycle of the pulse width modulation signal provided by the pulse width modulation signal supply circuit P1 to be 50% when the first digital When the input and output interface I1 detects a high-voltage signal, the duty ratio of the pulse width modulation signal is gradually reduced until the first digital input and output interface I1 detects a low-voltage signal, and the duty ratio at this time is maintained. .
  • the control strategy for adjusting the duty cycle of at least one embodiment of the driving circuit shown in 17 of the present disclosure may also be different from the above, and there is no limitation on the control strategy, it only needs to be able to control the operation of the driving circuit , the voltage value of the output voltage V2 may be within the ideal output voltage range.
  • the resistance value of the first resistor R1 and the resistance value of the second resistor R2 may be larger to reduce additional loss.
  • the voltage value of the input voltage V1 provided by the battery BT1 may be the input voltage value VDD, and VDD may be greater than or equal to 1.8V and less than or equal to 3V, the first The voltage drop Vf1 of the diode D1 and the voltage drop Vf2 of the second diode D2 may be 0.3V, but not limited thereto.
  • At least one embodiment of the driving circuit shown in FIG. 17 of the present disclosure has a simple structure, and can normally drive the light emitting diode to emit light under the premise of low cost and low voltage.
  • the load includes a third resistor R3 and a first light emitting diode L1; the second end of the third resistor R3 is connected to the The anode of the first light emitting diode L1 is electrically connected, and the cathode of the first light emitting diode L1 is electrically connected to the ground terminal G1;
  • the power supply circuit includes a battery BT1;
  • the boost circuit 12 includes a first diode D1, a second diode D2, a first capacitor C1 and a first filter capacitor C01;
  • the anode of the first diode D1 is electrically connected to the anode of the battery BT1, the cathode of the first diode D1 is electrically connected to the anode of the second diode D2, and the second diode
  • the cathode of the tube D2 is electrically connected to the first end of the third resistor R3; the negative electrode of the battery BT1 is electrically connected to the ground terminal G1;
  • the anode of the first diode D1 is connected to the input voltage V1; the booster circuit 12 provides the output voltage V2 through the cathode of the second diode D2;
  • the first end of the first capacitor C1 is electrically connected to the cathode of the first diode D1, and the second end of the first capacitor C1 is electrically connected to the output end of the pulse width modulation signal supply circuit P1;
  • the pulse width modulation signal supply circuit P1 is configured to output the pulse width modulation signal through its output terminal;
  • the first end of the first filter capacitor C01 is electrically connected to the cathode of the second diode D2, and the second end of the first filter capacitor C01 is electrically connected to the ground terminal G1;
  • the voltage dividing circuit 51 may include a first resistor R1 and a second resistor R2;
  • the first end of the first resistor R1 is electrically connected to the cathode of the second diode D2, and the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2;
  • the second terminal of the second resistor R2 is electrically connected to the ground terminal G1;
  • the first resistor R1 and the second resistor R2 divide the output voltage V2, and provide a divided voltage V0 through the second end of the first resistor R1, and provide the divided voltage V0 to the The non-inverting input of the comparator P3.
  • the driving circuit shown in FIG. 18 of the present disclosure can first control the duty cycle of the pulse width modulation signal provided by the pulse width modulation signal supply circuit P1 to be 50%, when the comparator When P3 outputs a high voltage signal, the duty cycle of the pulse width modulation signal is gradually reduced until the comparator P3 outputs a low voltage signal, and the current duty cycle driving is maintained.
  • the control strategy for adjusting the duty cycle of at least one embodiment of the driving circuit shown in 18 of the present disclosure may also be different from the above, and there is no limitation on the control strategy, it only needs to be able to control the operation of the driving circuit , the voltage value of the output voltage V2 may be within the ideal output voltage range.
  • the pulse width modulation signal supply circuit P1, the main control circuit P2 and the comparator P3 can be integrated in the controller M1 to reduce the The number of devices used.
  • the voltage value of the input voltage V1 provided by the battery BT1 may be the input voltage value VDD, and VDD may be greater than or equal to 1.8V and less than or equal to 3V, the first The voltage drop Vf1 of the diode D1 and the voltage drop Vf2 of the second diode D2 may be 0.3V, but not limited thereto.
  • At least one embodiment of the driving circuit shown in FIG. 18 of the present disclosure has a simple structure, and can normally drive the light emitting diode to emit light at low voltage under the premise of low cost.
  • the difference between at least one embodiment of the driving circuit shown in FIG. 19 of the present disclosure and at least one embodiment of the driving circuit shown in FIG. 18 of the present disclosure is as follows: the comparator P3 is arranged outside the controller M1;
  • At least one embodiment of the drive circuit shown in FIG. 19 of the present disclosure also includes a second digital input and output interface I2; the second digital input and output interface I2 is integrated in the controller M1, and the output terminal of the comparator P3 is passed through The second digital input and output interface I2 is electrically connected to the main control circuit P2.
  • the driving circuit shown in FIG. 19 of the present disclosure can first control the duty cycle of the pulse width modulation signal provided by the pulse width modulation signal supply circuit P1 to be 50%, when the comparator P3 outputs a high voltage signal, and when the second digital input and output interface I2 receives a high voltage signal, it decreases the duty ratio of the pulse width modulation signal step by step until the comparator P3 outputs a low voltage signal, and the The second digital input and output interface I2 receives the low voltage signal, and maintains the current duty cycle driving.
  • the control strategy for adjusting the duty cycle of at least one embodiment of the driving circuit shown in 19 of the present disclosure may also be different from the above, and there is no limitation on the control strategy, it only needs to be able to control the operation of the driving circuit , the voltage value of the output voltage V2 may be within the ideal output voltage range.
  • the load includes a third resistor R3 and a first light emitting diode L1; the second end of the third resistor R3 electrically connected to the anode of the first light emitting diode L1;
  • the power supply circuit includes a battery BT1;
  • the boost circuit 12 includes a first diode D1, a second diode D2, a first capacitor C1 and a first filter capacitor C01;
  • the anode of the first diode D1 is electrically connected to the anode of the battery BT1, the cathode of the first diode D1 is electrically connected to the anode of the second diode D2, and the second diode
  • the cathode of the tube D2 is electrically connected to the first end of the third resistor R3; the negative electrode of the battery BT1 is electrically connected to the ground terminal G1;
  • the anode of the first diode D1 is connected to the input voltage V1; the booster circuit 12 provides the output voltage V2 through the cathode of the second diode D2;
  • the first end of the first capacitor C1 is electrically connected to the cathode of the first diode D1, and the second end of the first capacitor C1 is electrically connected to the output end of the pulse width modulation signal supply circuit P1;
  • the pulse width modulation signal supply circuit P1 is configured to output the pulse width modulation signal through its output terminal;
  • the first end of the first filter capacitor C01 is electrically connected to the cathode of the second diode D2, and the second end of the first filter capacitor C01 is electrically connected to the ground terminal G1;
  • the switch circuit 92 includes a switch transistor Q1;
  • the third digital input and output interface I3 is electrically connected to the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is electrically connected to the gate of the switching transistor Q1;
  • the drain of the switch transistor Q1 is electrically connected to the cathode of the first light-emitting diode L1, and the source of the switch transistor Q1 is electrically connected to the ground terminal G1.
  • the voltage value of the input voltage V1 provided by the battery BT1 may be the input voltage value VDD, and VDD may be greater than or equal to 1.8V and less than or equal to 3V, the first The voltage drop Vf1 of the diode D1 and the voltage drop Vf2 of the second diode D2 may be 0.3V, but not limited thereto.
  • At least one embodiment of the driving circuit shown in FIG. 20 of the present disclosure has a simple structure, and can normally drive the light-emitting diode to emit light under the premise of low cost.
  • the switching transistor Q1 is an NMOS transistor (N-type metal-oxide-semiconductor transistor), but not limited thereto.
  • the switching transistor Q1 may be an n-type transistor or a p-type transistor, and the switching transistor Q1 may be a triode, a MOS transistor or a thin film transistor.
  • the type of the switching transistor Q1 is not limited here.
  • the main control circuit P2 is used to provide the control terminal of the switch circuit 92 with A low voltage signal to control the switch transistor Q1 to turn off, and control the cathode of the first light emitting diode L1 to disconnect from the first voltage terminal V01;
  • the main control circuit P2 is used to provide the control terminal of the switch circuit 92 with The high voltage signal is used to control the switch transistor Q1 to be turned on, and to control the connection between the cathode of the first light emitting diode L1 and the first voltage terminal V01.
  • the detection circuit includes an analog-to-digital converter A1; the analog-to-digital converter A1 integrated into the controller M1 with the pulse width modulation signal supply circuit P1;
  • the power supply circuit includes a battery BT1;
  • the boost circuit includes a first-stage boost sub-circuit 121, a second-stage boost sub-circuit 122, and a third-stage boost circuit 123;
  • the first stage boost sub-circuit 121 includes a first diode D1, a second diode D2, a first capacitor C1 and a first filter capacitor C01;
  • the second stage boost sub-circuit 122 includes a third diode D3, a fourth diode D4, a second capacitor C2 and a second filter capacitor C02;
  • the third stage boost sub-circuit 123 includes a fifth diode D5, a sixth diode D6, a third capacitor C3 and a third filter capacitor C03;
  • the anode of D1 is electrically connected to the positive pole of the battery BT1, the cathode of D1 is electrically connected to the anode of D2; the negative pole of the battery BT1 is electrically connected to the ground terminal G1;
  • the first end of C1 is electrically connected to the cathode of D1, the second end of C1 is electrically connected to the output end of the pulse width modulation signal supply circuit P1, and the pulse width modulation signal supply circuit P1 is used to output pulses through its output end. wide modulation signal;
  • the first end of C01 is electrically connected to the cathode of D2, and the second end of C01 is electrically connected to the ground terminal G1;
  • the anode of D3 is connected to the cathode of D2, and the cathode of D3 is electrically connected to the anode of D4;
  • the first end of C2 is electrically connected to the cathode of D3, and the second end of C2 is electrically connected to the output end of the pulse width modulation signal supply circuit P1;
  • the first end of C02 is electrically connected to the cathode of D4, and the second end of C02 is electrically connected to the ground terminal G1;
  • the anode of D5 is electrically connected to the cathode of D4, and the cathode of D5 is electrically connected to the anode of D6;
  • the first end of C3 is electrically connected to the cathode of D5, and the second end of C3 is electrically connected to the output end of the pulse width modulation signal supply circuit P1;
  • the first end of C03 is electrically connected to the cathode of D6, and the second end of C03 is electrically connected to the ground terminal G1;
  • the load includes a third resistor R3, a first light emitting diode L1, a second light emitting diode L2, a third light emitting diode L3 and a fourth light emitting diode L4;
  • the first end of R3 is electrically connected to the cathode of D6, and the second end of R3 is electrically connected to the anode of L1;
  • the cathode of L1 is electrically connected to the anode of L2, the cathode of L2 is electrically connected to the anode of L3, the cathode of L3 is electrically connected to the anode of L4, and the cathode of L4 is electrically connected to the ground terminal G1;
  • the anode of D1 is connected to the input voltage V1; the boost circuit provides the output voltage V2 through the cathode of D6.
  • the first light emitting diode L1 may be a red light emitting diode
  • the second light emitting diode L2 may be a green light emitting diode
  • the third light emitting The diode L3 may be a green light emitting diode
  • the fourth light emitting diode L4 may be a white light emitting diode, but not limited thereto.
  • the first light emitting diode L1, the second light emitting diode L2 and the third light emitting diode L3 may be packaged together.
  • the controller M1 may be an MCU (micro control unit).
  • the number of stages of boost sub-circuits included in the boost circuit can be increased, so that the voltage value of the output voltage V2 is higher.
  • the boost sub-circuits included in the boost circuit The number of stages of the circuit is not more than 3, otherwise the instantaneous current of the digital input and output interface may exceed the tolerance of the digital input and output interface.
  • Figure 21 shows only one of them.
  • the number of light-emitting diodes that can be driven can be estimated as: (V02-Vr3)/Vled; wherein, V02 is the voltage value of the output voltage V2, and Vr3 is The voltage across the third resistor R3 (the third resistor R3 can be a current-limiting resistor), and Vled is the voltage drop at both ends of each light-emitting diode under a certain operating current; in general, the Vled of the blue light-emitting diode and the white light emit light The Vled of the diode is about 3V.
  • Vr3 can be selected according to the actual situation, and Vr3 is related to the current flowing through the light emitting diode.
  • the diode used in the boost circuit is a Schottky diode, the voltage drop of which is about 0.3V but not limited thereto.
  • the driving method described in the embodiment of the present disclosure is used to drive a load, and the load includes a light emitting element.
  • the driving method is applied to the driving circuit described in at least one embodiment of the present disclosure, and the driving method includes:
  • the power supply circuit provides an input voltage for the input terminal of the boost circuit
  • the pulse width modulation signal supply circuit provides a pulse width modulation signal for the boost circuit
  • the boost circuit boosts the input voltage according to the pulse width modulation signal to obtain an output voltage, and drives the load through the output voltage;
  • the control circuit provides a duty cycle adjustment signal to the pulse width modulation signal supply circuit according to the input voltage or the output voltage, and controls the pulse width modulation signal supply circuit to adjust the pulse width modulation signal supply circuit according to the duty cycle adjustment signal.
  • the duty cycle of the pulse width modulated signal is a signal that is generated by the pulse width modulation signal.
  • control circuit can control the duty ratio of the pulse width modulation signal provided by the pulse width modulation signal supply circuit according to the input voltage or the output voltage, thereby controlling the The output voltage can be maintained at just the intensity that can control the luminous intensity of the light-emitting element, thereby improving the power conversion efficiency.
  • a look-up table is pre-stored in the control circuit, and the look-up table stores the correspondence between the voltage value of the input voltage and the duty cycle;
  • the control circuit provides a duty ratio adjustment signal to the pulse width modulation signal supply circuit according to the input voltage or the output voltage, and controls the pulse width modulation signal supply circuit to adjust according to the duty ratio adjustment signal.
  • the duty ratio step of the pulse width modulation signal comprises:
  • the control circuit looks up the corresponding duty cycle in the look-up table according to the voltage value of the input voltage, and provides a corresponding duty cycle adjustment signal to the pulse width modulation signal supply circuit, so that the pulse width
  • the modulation signal supply circuit adjusts the duty ratio of the pulse width modulation signal provided according to the duty ratio adjustment signal.
  • control circuit can control and adjust the duty ratio of the pulse width modulation signal according to the input voltage, and at this time, a look-up table method can be used, and the control circuit can adjust the duty cycle of the pulse width modulation signal according to the voltage value of the input voltage.
  • the corresponding duty ratio is searched in the look-up table, and the duty ratio of the pulse width modulation signal provided by the pulse width modulation signal supply circuit is controlled to be the corresponding duty ratio.
  • control circuit provides a duty ratio adjustment signal to the pulse width modulation signal supply circuit according to the input voltage or the output voltage, and controls the pulse width modulation signal supply circuit according to The duty ratio adjustment signal, the step of adjusting the duty ratio of the pulse width modulation signal includes:
  • the control circuit compares the voltage value of the output voltage with an output terminal voltage threshold
  • control circuit determines that the voltage value of the output voltage is higher than the output voltage threshold, the control circuit controls the pulse width modulation signal supply circuit to decrease the duty ratio step by step until the output voltage The voltage value is reduced to the ideal output voltage range;
  • control circuit determines that the voltage value of the output voltage is lower than the output voltage value threshold, the control circuit controls the pulse width modulation signal supply circuit to increase the duty ratio step by step until the The voltage value of the output voltage is raised to within the range of the ideal output voltage value.
  • control circuit can control and adjust the duty cycle of the pulse width modulation signal according to the input voltage.
  • a feedback method can be used to determine that the voltage value of the output voltage is higher than the The output voltage value threshold is at or below the output voltage value threshold value, and the duty cycle is controlled and adjusted according to the comparison result until the voltage value of the output voltage is within the ideal output voltage value range.
  • the electronic price tag system described in the embodiment of the present disclosure includes a load and the above-mentioned drive circuit
  • the load includes a light emitting element, and the driving circuit is used to drive the load.
  • the electronic price tag system described in at least one embodiment of the present disclosure may further include a communication unit, a controller, and an electronic ink screen;
  • the communication unit is used to receive a price tag information update signal, and provide the price tag information update signal to the controller, and the communication unit is also used to receive a light-emitting indication signal, and provide the light-emitting indication signal to The controller; the price tag information update signal carries updated price tag information;
  • the controller is configured to control the drive circuit to drive the light-emitting element to emit light when receiving the price tag information update signal, and to transmit the price tag information update signal to
  • the carried price tag information is displayed on the electronic ink screen, and is used to control the driving circuit to drive the light-emitting element to emit light when the light-emitting indication signal is received.
  • some components of the drive circuit may be integrated into the controller.
  • the electronic price tag system can receive the price tag information update signal and the light-emitting indication signal through the communication unit, and provide the signal to the controller, and the controller receives the signal
  • the driving circuit is controlled to drive the light-emitting element included in the load to emit light
  • the price tag information carried in the price tag information update signal displayed on the electronic ink screen and when receiving the light-emitting indication signal, control the drive circuit to drive the light-emitting element to emit light.
  • the electronic price tag system described in at least one embodiment of the present disclosure includes a drive circuit 220, a load 221, a communication unit 222, a controller M1, and an electronic ink screen X1;
  • the communication unit 22 is used to receive a price tag information update signal, and provide the price tag information update signal to the controller M1, and the communication unit 22 is also used to receive a light-emitting indication signal, and send the light-emitting indication signal to the controller M1.
  • the signal is provided to the controller M1; the price tag information update signal carries updated price tag information;
  • the controller M1 is configured to control the drive circuit 220 to drive the light-emitting element to emit light when receiving the price tag information update signal, and after receiving the price tag information update signal, turn the price tag
  • the price tag information carried by the information update signal is displayed on the electronic ink screen X1, and is used to control the driving circuit 220 to drive the light-emitting element to emit light when the light-emitting indication signal is received.
  • some devices included in the driving circuit 220 may be integrated in the controller M1.
  • the communication unit may include a radio frequency transceiver unit A2 and an NFC (Near Field Communication, near field communication) unit 230, so The radio frequency transceiver unit is used for radio frequency communication with the base station, and the NFC unit 230 is used for near field communication;
  • the radio frequency transceiver unit is used for radio frequency communication with the base station, and the NFC unit 230 is used for near field communication;
  • the controller is an electronic price tag controller, which is responsible for information display on the electronic ink screen, LED status indication, NFC communication, and video communication with the base station; Part of the time, the electronic price tag system saves power in a dormant state, and the controller will automatically wake up periodically to inquire about the communication between the base station and the price tag.
  • the controller When there is price tag information that needs to be updated, it will receive the price tag information and send it to the electronic ink screen , while driving the boost circuit in the drive circuit, so that the LED indicator light (the light-emitting element is the LED indicator light) performs a flashing prompt, or in other states, the controller expects a light prompt When needed, it will also drive the boost circuit to make the LED indicator light.
  • the LED indicator light the light-emitting element is the LED indicator light
  • the controller When needed, it will also drive the boost circuit to make the LED indicator light.

Abstract

一种驱动电路、驱动方法和电子价签系统，驱动电路包括电源电路（11）、升压电路（12）、脉宽调制信号提供电路（P1）和控制电路（14）；脉宽调制信号提供电路（P1）为升压电路（12）提供脉宽调制信号；升压电路（12）根据脉宽调制信号，对输入电压（V1）进行升压，以得到输出电压（V2），并通过输出电压（V2）驱动负载（15）；控制电路（14）与升压电路（12）电连接，用于根据输入电压（V1）或输出电压（V2），向脉宽调制信号提供电路（P1）提供占空比调节信号，控制脉宽调制信号提供电路（P1）根据占空比调节信号，调节脉宽调制信号的占空比。该驱动电路能在电源电路（11）提供的输入电压（V1）变化时，控制负载（15）包括的发光元件的发光亮度恒定。

Description

驱动电路、驱动方法和电子价签系统 技术领域
本公开涉及发光驱动技术领域，尤其涉及一种驱动电路、驱动方法和电子价签系统。
背景技术
在相关的驱动电路中，通过升压电路对电源电路提供的输入电压进行升压，以得到输出电压，通过所述输出电压驱动负载(所述负载包括发光元件)，以驱动所述发光元件发光。然而相关的驱动电路不能在电源电路提供的输入电压变化时，控制负载包括的发光元件的发光亮度恒定。
发明内容
在一个方面中，本公开实施例提供了一种驱动电路，用于驱动负载，所述负载包括发光元件，所述驱动电路包括电源电路、升压电路、脉宽调制信号提供电路和控制电路；所述升压电路的输入端与电源电路电连接，所述升压电路的输出端与所述负载电连接；
所述电源电路用于为所述升压电路的输入端提供输入电压；
所述脉宽调制信号提供电路与所述升压电路电连接，用于为所述升压电路提供脉宽调制信号；
所述升压电路用于根据所述脉宽调制信号，对所述输入电压进行升压，以得到输出电压，并通过所述输出电压驱动所述负载；
所述控制电路与所述升压电路电连接，用于根据输入电压或所述输出电压，向所述脉宽调制信号提供电路提供占空比调节信号，控制所述脉宽调制信号提供电路根据所述占空比调节信号，调节所述脉宽调制信号的占空比。
可选的，所述控制电路包括检测电路和主控电路；
所述检测电路分别与所述升压电路的输入端和所述主控电路电连接，用于检测所述输入电压，并将所述输入电压提供至所述主控电路；
所述主控电路中预存有查找表；所述查找表中存储有所述输入电压的电 压值与所述占空比之间的对应关系；
所述主控电路与所述脉宽调制信号提供电路电连接，用于根据所述输入电压的电压值，在所述查找表中查找相应的占空比，向所述脉宽调制信号提供电路提供相应的占空比调节信号。
可选的，所述控制电路包括检测电路和主控电路；
所述检测电路分别与所述升压电路的输出端和所述主控电路电连接，用于检测所述输出电压，并将所述输出电压提供至所述主控电路；
所述主控电路用于比较所述输出电压的电压值与输出电压值阈值，根据比较结果向所述脉宽调制信号提供电路提供相应的占空比调节信号。
可选的，所述控制电路包括分压电路、第一数字输入输出接口和主控电路；所述第一数字输入输出接口和所述主控电路集成于控制器中；
所述分压电路用于对所述输出电压进行分压，得到分压电压，并将所述分压电压提供至所述第一数字输入输出接口；
所述主控电路分别与所述第一数字输入输出接口和所述脉宽调制信号提供电路电连接，用于根据所述第一数字输入输出接口提供的电压信号，向所述脉宽调制信号提供电路提供相应的占空比调节信号。
可选的，所述控制电路包括分压电路、比较器和主控电路；
所述分压电路用于对所述输出电压进行分压，得到分压电压，并将所述分压电压提供至所述比较器的正相输入端；
所述比较器的反相输入端与参考电压端电连接，所述比较器的输出端与所述主控电路电连接，所述比较器用于比较所述分压电压的电压值与所述参考电压端提供的参考电压，根据比较结果输出相应的电压信号；
所述主控电路用于根据所述电压信号，向所述脉宽调制信号提供电路提供相应的占空比调节信号。
可选的，所述脉宽调制信号提供电路、所述主控电路和所述比较器集成于控制器中；或者，
所述驱动电路还包括第二数字输入输出接口；所述脉宽调制信号提供电路、所述主控电路和所述第二数字输入输出接口集成于控制器中，所述比较器设置于所述控制器外部；所述比较器的输出端通过所述第二数字输入输出 接口与所述主控电路电连接。
可选的，所述分压电路包括第一电阻和第二电阻；
所述第一电阻的第一端与所述输出端电连接，所述第一电阻的第二端与所述第二电阻的第一端电连接；
所述第二电阻的第二端与第一电压端电连接。
可选的，所述负载包括第三电阻和发光单元；所述第三电阻的第一端与所述升压电路的输出端电连接，所述第三电阻的第二端与所述发光单元的第一端电连接，所述发光单元的第二端与第一电压端电连接；
所述发光单元包括一个发光元件，所述发光元件的第一极为所述发光单元的第一端，所述发光元件的第二极为所述发光单元的第二端；或者，所述发光单元包括N个发光元件，第一发光元件的第一极为所述发光单元的第一端，第n发光元件的第一极与第n-1发光元件的第二极电连接，第N发光元件的第二极为所述发光单元的第二端；N为大于1的整数，n为大于1而小于等于N的整数。
可选的，本公开至少一实施例所述的驱动电路还包括通断控制电路和开关电路；所述发光单元的第二端通过所述开关电路与所述第一电压端电连接；
所述开关电路的控制端与所述通断控制电路电连接；
所述通断控制电路用于向所述开关电路的控制端提供开启控制信号或关断控制信号，以控制所述开关电路导通或断开所述发光单元的第二端与所述第一电压端之间的连接。
可选的，所述控制电路包括主控电路，所述驱动电路还包括第三数字输入输出接口、第四电阻和开关电路；所述主控电路和所述第三数字输入输出接口集成于控制器中；所述第三数字输入输出接口与所述第四电阻的第一端电连接，所述第四电阻的第二端与所述开关电路的控制端电连接；所述发光单元的第二端通过所述开关电路与所述第一电压端电连接；
所述主控电路用于通过所述第三数字输入输出接口和所述第四电阻，向所述开关电路的控制端提供开启控制信号或关断控制信号，以控制所述开关电路导通或断开所述发光单元的第二端与所述第一电压端之间的连接。
可选的，所述升压电路包括第一二极管、第二二极管和第一电容；
所述第一二极管的阳极与所述升压电路的输入端电连接，所述第一二极管的阴极与所述第二二极管的阳极电连接，所述第二二极管的阴极与所述升压电路的输出端电连接；
所述第一电容的第一端与所述第一二极管的阴极电连接，所述第一电容的第二端与所述脉宽调制信号提供电路的输出端电连接；
所述脉宽调制信号提供电路通过其输出端输出所述脉宽调制信号。
可选的，所述升压电路还包括第一滤波电容；所述第一滤波电容的第一端与所述升压电路的输出端电连接，所述第一滤波电容的第二端与第一电压端电连接。
可选的，所述升压电路包括A级升压子电路；A为大于1的整数；
第a级升压子电路包括第2a-1二极管、第2a二极管、第a电容和第a滤波电容；a为小于或等于A的正整数；
所述第2a-1二极管的阳极与第a输入节点电连接，所述第2a-1二极管的阴极与第a中间节点电连接；
所述第2a二极管的阳极与所述第a中间节点电连接，所述第2a二极管的阴极与第a输出节点电连接；
第一输入节点为所述升压电路的输入端，第A输出节点为所述升压电路的输出端，第b输入节点为第b-1输出节点，b为大于1而小于等于A的整数。
可选的，所述升压电路还包括A个滤波电容；
第a滤波电容的第一端与所述第a输出节点电连接，所述第a滤波电容的第二端与第一电压端电连接。
可选的，所述电源电路包括电池；
所述电池的正极与所述升压电路的输入端电连接，所述电池的负极与第一电压端电连接。
在第二各方面中，本公开实施例提供一种驱动方法，用于驱动负载，所述负载包括发光元件，应用于上述的驱动电路，所述驱动方法包括：
电源电路为升压电路的输入端提供输入电压；
脉宽调制信号提供电路为所述升压电路提供脉宽调制信号；
升压电路根据所述脉宽调制信号，对所述输入电压进行升压，以得到输 出电压，并通过所述输出电压驱动所述负载；
控制电路根据所述输入电压或所述输出电压，向所述脉宽调制信号提供电路提供占空比调节信号，控制所述脉宽调制信号提供电路根据所述占空比调节信号，调节所述脉宽调制信号的占空比。
可选的，所述控制电路中预存有查找表，所述查找表中存储有所述输入电压的电压值与所述占空比之间的对应关系；
所述控制电路根据所述输入电压或所述输出电压，向所述脉宽调制信号提供电路提供占空比调节信号，控制所述脉宽调制信号提供电路根据所述占空比调节信号，调节所述脉宽调制信号的占空比步骤包括：
所述控制电路根据所述输入电压的电压值，在所述查找表中查找相应的占空比，向所述脉宽调制信号提供电路提供相应的占空比调节信号，以使得所述脉宽调制信号提供电路根据所述占空比调节信号调节提供的脉宽调制信号的占空比。
可选的，所述控制电路根据所述输入电压或所述输出电压，向所述脉宽调制信号提供电路提供占空比调节信号，控制所述脉宽调制信号提供电路根据所述占空比调节信号，调节所述脉宽调制信号的占空比步骤包括：
所述控制电路比较所述输出电压的电压值与输出端电压阈值；
当所述控制电路判断到所述输出电压的电压值高于输出电压值阈值时，所述控制电路控制所述脉宽调制信号提供电路逐级调低所述占空比，直至所述输出电压的电压值降低至理想输出电压值范围内；
当所述控制电路判断到所述输出电压的电压值低于所述输出电压值阈值时，所述控制电路控制所述脉宽调制信号提供电路逐级调高所述占空比，直至所述输出电压的电压值提升至理想输出电压值范围内。
在第三个方面中，本公开实施例提供一种电子价签系统，包括负载和上述的驱动电路；
所述负载包括发光元件，所述驱动电路用于驱动所述负载。
可选的，本公开至少一实施例所述的电子价签系统还包括通信单元、控制器和电子墨水屏；
所述通信单元用于接收价签信息更新信号，并将所述价签信息更新信号 提供至所述控制器，所述通信单元还用于接收发光指示信号，并将所述发光指示信号提供至所述控制器；所述价签信息更新信号携带更新后的价签信息；
所述控制器用于在接收到所述价签信息更新信号时，控制所述驱动电路驱动所述发光元件发光，并在接收到所述价签信息更新信号后，将所述价签信息更新信号携带的价签信息显示于所述电子墨水屏上，并用于在接收到所述发光指示信号时，控制所述驱动电路驱动所述发光元件发光。
附图说明
图1是本公开至少一实施例所述的驱动电路的结构图；
图2是本公开至少一实施例所述的驱动电路的结构图；
图3是本公开至少一实施例所述的驱动电路的结构图；
图4是本公开至少一实施例所述的驱动电路的结构图；
图5是本公开至少一实施例所述的驱动电路的结构图；
图6是本公开至少一实施例所述的驱动电路的结构图；
图7是本公开至少一实施例所述的驱动电路的结构图；
图8是本公开至少一实施例所述的驱动电路的结构图；
图9是本公开至少一实施例所述的驱动电路的结构图；
图10是本公开至少一实施例所述的驱动电路的结构图；
图11是本公开至少一实施例所述的驱动电路的结构图；
图12是本公开至少一实施例所述的驱动电路的电路图；
图13A是本公开如图12所示的驱动电路的至少一实施例在工作时，脉宽调制信号提供电路P2提供的脉宽调制信号的电压值Va的仿真波形图；
图13B是本公开如图12所示的驱动电路的至少一实施例在工作时，第一节点N1的电位Vn1的仿真波形图；
图13C是本公开如图12所示的驱动电路的至少一实施例在工作时，所述输出电压V2的电压值V02的仿真波形图；
图14是本公开至少一实施例所述的驱动电路的电路图；
图15A是本公开如图14所示的驱动电路的至少一实施例在工作时，脉宽调制信号提供电路P2提供的脉宽调制信号的电压值Va的仿真波形图；
图15B是本公开如图14所示的驱动电路的至少一实施例在工作时，第一节点N1的电位Vn1的仿真波形图；
图15C是本公开如图14所示的驱动电路的至少一实施例在工作时，所述输出电压V2的电压值V02的仿真波形图；
图16是本公开至少一实施例所述的驱动电路的电路图；
图17是本公开至少一实施例所述的驱动电路的电路图；
图18是本公开至少一实施例所述的驱动电路的电路图；
图19是本公开至少一实施例所述的驱动电路的电路图；
图20是本公开至少一实施例所述的驱动电路的电路图；
图21是本公开至少一实施例所述的驱动电路的电路图；
图22是本公开至少一实施例所述的电子价签系统的结构图；
图23是本公开至少一实施例所述的电子价签系统的结构图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
本公开实施例所述的驱动电路用于驱动负载，所述负载包括发光元件，所述驱动电路包括电源电路、升压电路、脉宽调制信号提供电路和控制电路；所述升压电路的输入端与电源电路电连接，所述升压电路的输出端与所述负载电连接；
所述电源电路与所述升压电路的输入端电连接，用于为所述升压电路的输入端提供输入电压；
所述脉宽调制信号提供电路与所述升压电路电连接，用于为所述升压电路提供脉宽调制信号；
所述升压电路与所述负载电连接，用于根据所述脉宽调制信号，对所述输入电压进行升压，以得到输出电压，并通过所述输出电压驱动所述负载；
所述控制电路与所述升压电路电连接，用于根据输入电压或所述输出电 压，向所述脉宽调制信号提供电路提供占空比调节信号，控制所述脉宽调制信号提供电路根据所述占空比调节信号，调节所述脉宽调制信号的占空比，以使得所述输出电压的有效值恒定。
本公开实施例所述的驱动电路增设了所述脉宽调制信号提供电路和所述控制电路，所述控制电路根据所述升压电路的输入电压或所述升压电路的输出电压，控制所述脉宽调制信号提供电路相应调节其产生的脉宽调制信号的占空比，从而在所述电源电路提供的输入电压变化时，也能够使得所述输出电压的有效值恒定，控制所述负载包括的发光元件的发光亮度恒定。
在本公开至少一实施例中，所述输出电压的有效值恒定指的可以是：所述输出电压的有效值变化不大，所述输出电压的有效值的变化量的绝对值小于或等于电压变化量阈值；例如，所述电压变化量阈值可以小于或等于0.1V，但不以此为限。
在本公开至少一实施例中，所述发光元件的发光亮度恒定指的是：所述发光元件的发光亮度变化不大；所述发光元件的发光亮度的变化量小于或等于亮度变化量阈值；例如，所述亮度变化量阈值可以小于或等于0.3nit(尼特)，但不以此为限。
本公开实施例所述的驱动电路能够在所述电源电路提供的输入电压改变时保证所述发光元件的发光亮度恒定，本公开实施例所述的驱动电路的结构简单，能够在低成本的前提下控制发光元件的发光亮度恒定。
本公开实施例所述的驱动电路能够通过所述控制电路根据所述输入电压或所述输出电压，控制所述脉宽调制信号提供电路提供的脉宽调制信号的占空比，从而能够控制所述输出电压能够维持在恰好能够控制所述发光元件发光的强度，进而能够提升电源转换效率。而在相关技术中，脉宽调制信号的占空比固定，则在所述输入电压固定时，所述输出电压固定，当所述输出电压大于所述发光元件的导通电压时，多余的电压会作用消耗在负载包括的电阻中，因此相关的驱动电路的电源转换效率低。
本公开至少一实施例所述的驱动电路用于驱动负载，所述负载包括发光元件，如图1所示，本公开至少一实施例所述的驱动电路包括电源电路11、升压电路12、脉宽调制信号提供电路P1和控制电路14；
所述升压电路12的输入端与电源电路11电连接，所述升压电路12的输出端与所述负载15电连接；
所述电源电路11与所述升压电路12的输入端电连接，用于为所述升压电路12的输入端提供输入电压V1；
所述脉宽调制信号提供电路P1与所述升压电路12电连接，用于为所述升压电路12提供脉宽调制信号；
所述升压电路12与所述负载15电连接，用于根据所述脉宽调制信号，对所述输入电压V1进行升压，以得到输出电压V2，并通过所述输出电压V2驱动所述负载15；
所述控制电路14与所述升压电路12的输入端电连接，用于根据输入电压V1，向所述脉宽调制信号提供电路P1提供占空比调节信号，控制所述脉宽调制信号提供电路P1根据所述占空比调节信号，调节所述脉宽调制信号的占空比，以使得所述输出电压的有效值恒定。
本公开如图1所示的驱动电路的至少一实施例在工作时，所述控制电路14根据所述输入电压V1，向所述脉宽调制信号提供电路P1提供占空比调节信号；
当所述控制电路14判断到所述输入电压V1的电压值小于输入电压值阈值时，所述控制电路14可以向所述脉宽调制信号提供电路P1提供指示调高占空比的第一占空比调节信号至所述升压电路12，所述脉宽调制信号提供电路P1根据所述第一占空比调节信号，调高提供的所述脉宽调制信号的占空比，所述升压电路12根据所述脉宽调制信号，调高所述输出电压V2的电压值，使得所述输出电压V2的电压值达到输出电压值阈值；
当所述控制电路14判断到所述输入电压V1的电压值大于输入电压值阈值时，所述控制电路14可以向所述脉宽调制信号提供电路P1提供指示调低占空比的第二占空比调节信号至所述升压电路12，所述脉宽调制信号提供电路P1根据所述第二占空比调节信号，调低提供的所述脉宽调制信号的占空比，所述升压电路12根据所述脉宽调制信号，调低所述输出电压V2的电压值，使得所述输出电压V2的电压值降低至所述输出电压值阈值。
在本公开至少一实施例中，所述输入电压值阈值例如可以大于或等于 1.8V而小于或等于3V，但不以此为限；例如，所述输入电压值阈值可以为1.8V、2V、2.5V、2.8V或3V。
在本公开至少一实施例中，所述负载15包括的发光元件可以为LED(发光二极管)，LED可以直接由PWM信号(脉宽调制信号)驱动，LED的发光亮度与所述输出电压的有效值直接相关；通过改变所述脉宽调制信号的占空比，可以调整所述输出电压的有效值，进而调整LED的发光亮度。但是需要注意的是，所述脉宽调制信号的占空比与所述输出电压的有效值并不是简单的按比例系数变化的，所述输出电压的有效值与所述占空比、负载大小和二极管压降等都相关。
本公开如图1所示的驱动电路的至少一实施例在工作时，在所述输入电压变化的情况下，保证发光元件的发光亮度恒定的方法如下：
在所述驱动电路驱动发光元件发光前，先进行电源电路11提供的输入电压采集，根据采集结果设定查找表，所述查找表中存储有输入电压的电压值与占空比的对应关系；例如，如果检测到所述输入电压的电压值为高值，则查询到的占空比为低值；如果检测到所述输入电压的电压值为低值，则查询到的占空比为高值。设定所述占空比的原则是：既要满足发光元件的发光强度要求，也要尽量降低所述输出电压的电压值，减少不必要的损耗。在所述驱动电路驱动发光元件发光时，根据所述输入电压的电压值在查找表中找到相应的占空比，所述脉宽调制信号提供电路P1按此占空比发出脉宽调制信号，所述升压电路12根据所述脉宽调制信号对所述输入电压进行升压，得到输出电压，通过所述输出电压驱动所述发光元件以期望的发光强度点亮。
在设定所述查找表时，通过所述电源电路11输出具有不同的电压值的输入电压至所述升压电路12的输入端，所述控制电路14控制所述脉宽调制信号提供电路P1调节其提供的脉宽调制信号的占空比，并在每调节一次所述占空比后，采集所述输出电压的电压值，记录当所述输出电压的电压值为输出电压值阈值时，对应的占空比，将所述输入电压的电压值与所述占空比的对应关系记录于所述查找表中。
本公开至少一实施例所述的驱动电路用于驱动负载，所述负载包括发光元件，如图2所示，本公开至少一实施例所述的驱动电路包括电源电路11、 升压电路12、脉宽调制信号提供电路P1和控制电路14；
所述升压电路12的输入端与电源电路11电连接，所述升压电路12的输出端与所述负载15电连接；
所述电源电路11与所述升压电路12的输入端电连接，用于为所述升压电路12的输入端提供输入电压V1；
所述脉宽调制信号提供电路P1与所述升压电路12电连接，用于为所述升压电路12提供脉宽调制信号；
所述升压电路12的输出端与所述负载15电连接，用于根据所述脉宽调制信号，对所述输入电压V1进行升压，以得到输出电压V2，并通过所述输出电压V2驱动所述负载15；
所述控制电路14与所述升压电路12的输出端电连接，用于根据所述输出电压V2，向所述脉宽调制信号提供电路P1提供占空比调节信号，控制所述脉宽调制信号提供电路P1根据所述占空比调节信号，调节所述脉宽调制信号的占空比，以使得所述输出电压的有效值恒定。
本公开如图2所述的驱动电路的至少一实施例在工作时，所述控制电路14根据所述输出电压V2的电压值，控制所述脉宽调制信号提供电路调节所述占空比；
当所述控制电路14判断到所述输出电压V2的电压值小于输出电压值阈值时，所述控制电路14可以向所述脉宽调制信号提供电路P1提供指示调高占空比的第三占空比调节信号至所述升压电路12，所述脉宽调制信号提供电路P1根据所述第三占空比调节信号，调高提供的所述脉宽调制信号的占空比，所述升压电路12根据所述脉宽调制信号，调高所述输出电压V2的电压值；
当所述控制电路14判断到所述输出电压V2的电压值大于输出电压值阈值时，所述控制电路14可以向所述脉宽调制信号提供电路P1提供指示调低占空比的第四占空比调节信号至所述升压电路12，所述脉宽调制信号提供电路P1根据所述第二占空比调节信号，调低提供的所述脉宽调制信号的占空比，所述升压电路12根据所述脉宽调制信号，调高所述输出电压V2的电压值。
在本公开如图2所示的驱动电路的至少一实施例中，所述控制电路14根据所述输出电压V2的电压值来控制调节所述脉宽调制信号的占空比，此时 占空比调节策略由查表法改为反馈法，即所述控制电路14实时采集所述输出电压，程序内置一期望的理想电压值(所述理想电压值即为输出电压值阈值)，所述理想电压值既可以保证发光元件的发光强度，也考虑了发光效率，尽量减少不必要的损耗。当所述控制电路14判断到所述输出电压的电压值高于所述输出电压值阈值时，所述控制电路14控制所述脉宽调制信号提供电路P1逐级调低所述占空比，直至所述输出电压的电压值降低至理想输出电压值范围内；当所述控制电路14判断到所述输出电压的电压值低于所述输出电压值阈值时，所述控制电路14控制所述脉宽调制信号提供电路P1逐级调高所述占空比，直至所述输出电压的电压值提升至理想输出电压值范围内。这个调节过程可以在十毫秒级到百毫秒级内完成，对发光元件的指示效果影响不大。
在具体实施时，当所述输出电压的电压值在理想输出电压值范围内时，所述发光元件能够发光，并发光效率较高，并所述输出电压的电压值与所述输出电压值阈值之间的差值的绝对值小于等于预定差值，例如，所述预定差值可以为0.05V，但不以此为限。
例如，当所述发光元件的导通电压为3V时，所述理想输出电压值范围可以为大于等于3.15V而小于等于3.25V，所述输出电压值阈值可以为3.2V，但不以此为限。
在本公开至少一实施例中，当所述脉宽调制信号提供电路P1逐级调低所述占空比，或逐级调高所述占空比时，每次调节的步进可以大于等于0.5％而小于等于1％，但不以此为限。从理论上来说，每次调节的步进越小越好，但是在实际操作时，所述步进需要根据实际采用的控制器的性能而定。
在本公开至少一实施例中，在图1所示的驱动电路的至少一实施例的基础上，如图3所示，所述控制电路包括检测电路31和主控电路P2；
所述检测电路31分别与所述升压电路12的输入端和所述主控电路P2电连接，用于检测所述输入电压V1，并将所述输入电压V1提供至所述主控电路P2；
所述主控电路P2中预存有查找表；所述查找表中存储有所述输入电压的电压值与所述占空比之间的对应关系；
所述主控电路P2与所述脉宽调制信号提供电路P1电连接，用于根据所 述输入电压的电压值，在所述查找表中查找相应的占空比，向所述脉宽调制信号提供电路P1提供相应的占空比调节信号，以使得所述脉宽调制信号提供电路P1根据所述占空比调节信号调节提供的脉宽调制信号的占空比。
可选的，所述检测电路31可以为ADC(模数转换器)，所述主控电路P2可以为CPU(中央处理器)，但不以此为限。
在本公开至少一实施例中，在图2所示的驱动电路的至少一实施例的基础上，如图4所示，所述控制电路包括检测电路31和主控电路P2；
所述检测电路31分别与所述升压电路12的输出端和所述主控电路P2电连接，用于检测所述输出电压V2，并将所述输出电压V2提供至所述主控电路P2；
所述主控电路P2用于比较所述输出电压V2的电压值与输出电压值阈值，根据比较结果向所述脉宽调制信号提供电路P1提供相应的占空比调节信号。
本公开如图4所示的驱动电路的至少一实施例在工作时，所述检测电路31检测所述输出电压V2，所述主控电路P2比较所述输出电压V2的电压值与所述输出电压值阈值，并当比较结果指示所述输出电压V2的电压值小于所述输出电压值阈值时，所述主控电路P2向所述脉宽调制信号提供电路P1提供相应的占空比调节信号，以控制所述脉宽调制信号提供电路P1逐级调低其提供的脉宽调制信号的占空比，直至所述输出电压V2的电压值下降至所述理想输出电压值范围内；当所述比较结果指示所述输出电压V2的电压值大于所述输出电压值阈值时，所述主控电路P2向所述脉宽调制信号提供电路P1提供相应的占空比调节信号，以控制所述脉宽调制信号提供电路P1逐级调高其提供的脉宽调制信号的占空比，直至所述输出电压V2的电压值提升至所述理想输出电压值范围内。
在本公开至少一实施例中，如图5所示，在图2所示的驱动电路的至少一实施例中，所述控制电路包括分压电路51、第一数字输入输出接口I1和主控电路P2；所述第一数字输入输出接口I1和所述主控电路P2集成于控制器M1中；
所述分压电路51用于对所述输出电压V2进行分压，得到分压电压V0，并将所述分压电压V0提供至所述第一数字输入输出接口I1；
所述主控电路P2分别与所述第一数字输入输出接口I1和所述脉宽调制信号提供电路P1电连接，用于根据所述第一数字输入输出接口I1提供的电压信号，向所述脉宽调制信号提供电路P1提供相应的占空比调节信号。
在本公开如图5所示的驱动电路的至少一实施例中，所述电源电路11可以为所述控制器M1提供输入电压V1，以为所述控制器M1供电。
本公开如图5所示的驱动电路的至少一实施例在工作时，所述分压电路51对所述输出电压V2进行分压，得到分压电压V0，并将所述分压电压V0提供至所述第一数字输入输出接口I1，当所述分压电压V0的电压值大于预定电压值时，所述第一数字输入输出接口I1提供至所述主控电路P2的电压信号为高电压信号，当所述分压电压V0的电压值小于所述预定电压值时，所述第一数字输入输出接口I1提供至所述主控电路P2的电压信号为低电压信号；所述主控电路P2用于当所述第一数字输入输出接口I1提供高电压信号时，向所述脉宽调制信号提供电路P1提供指示调低所述占空比的占空比调节信号，并用于当所述第一数字输入输出接口I1提供低电压信号时，向所述脉宽调制信号提供电路P1提供指示调高所述占空比的占空比调节信号。
在具体实施时，在向所述脉宽调制信号提供电路P1提供指示调低所述占空比的占空比调节信号时，所述脉宽调制信号提供电路P1可以逐级调低所述占空比；在向所述脉宽调制信号提供电路P1提供指示调高所述占空比的占空比调节信号时，所述脉宽调制信号提供电路P1可以逐级调高所述占空比。
在本公开至少一实施例中，所述预定电压值可以根据所述控制器的型号而设定，例如，所述预定电压值可以为1.6V、1.8V、2V或2.5V，但不以此为限。
在本公开至少一实施例中，所述主控电路P2可以为CPU，所述控制器可以为MCU(微控制单元)，所述MCU可以为低压控制器，并本公开至少一实施例不采用用于提升驱动电流的三极管，因此本公开至少一实施例能够在低压下正常驱动发光元件发光。
可选的，所述分压电路包括第一电阻和第二电阻；
所述第一电阻的第一端与所述升压电路的输出端电连接，所述第一电阻的第二端与所述第二电阻的第一端电连接；
所述第二电阻的第二端与第一电压端电连接。
在本公开至少一实施例中，所述第一电压端可以为地端或低电压端，但不以此为限。
在具体实施时，需要通过设置第一电阻的电阻值和第二电阻的电阻值，通过仔细计算第一电阻和第二电阻的分压比例，使得当所述输出电压的电压值为输出电压值阈值时，所述分压电路得到的分压电压刚好能够被第一数字输入输出接口识别为高电压信号，并在此基础上调低一级占空比后，所述分压电路得到的分压电压被所述第一数字输入输出接口识别为低电压信号，但是此时所述升压电路提供的输出电压仍能够驱动所述发光元件发光，所述输出电压的电压值在理想输出电压值范围内。
在本公开至少一实施例中，如图6所示，在图2所示的驱动电路的至少一实施例的基础上，所述控制电路可以包括分压电路51、比较器P3和主控电路P2；
所述分压电路51用于对所述输出电压V2进行分压，得到分压电压V0，并将所述分压电压V0提供至所述比较器P3的正相输入端；
所述比较器P3的反相输入端与参考电压端R1电连接，所述比较器P3的输出端与所述主控电路P2电连接，所述比较器P3用于比较所述分压电压V0的电压值与所述参考电压端R1提供的参考电压Vref，根据比较结果输出相应的电压信号；
所述主控电路P2用于根据所述电压信号，向所述脉宽调制信号提供电路P1提供相应的占空比调节信号。
本公开如图6所示的驱动电路的至少一实施例在工作时，当所述分压电压V0的电压值大于所述参考电压Vref时，所述比较器P3输出高电压信号，当所述分压电压V0的电压值小于所述参考电压Vref时，所述比较器P3输出低电压信号；
当所述比较器P3输出高电压信号时，所述主控电路P2向所述脉宽调制信号提供电路P1提供指示调低占空比的占空比调节信号，以控制所述脉宽调制信号提供电路P1逐级调低其提供的脉宽调制信号的占空比；
当所述比较器P3输出低电压信号时，所述主控电路P2向所述脉宽调制 信号提供电路P1提供指示调高占空比的占空比调节信号，以控制所述脉宽调制信号提供电路P1逐级调高其提供的脉宽调制信号的占空比。
可选的，所述分压电路包括第一电阻和第二电阻；
所述第一电阻的第一端与所述升压电路的输出端电连接，所述第一电阻的第二端与所述第二电阻的第一端电连接；
所述第二电阻的第二端与第一电压端电连接。
在本公开至少一实施例中，所述第一电压端可以为地端或低电压端，但不以此为限。
本公开如图6所示的驱动电路的至少一实施例在工作时，所述参考电压Vref、所述分压电路51包括的第一电阻的电阻值，以及，所述分压电路51包括的第二电阻的电阻值可以根据实际情况选定，使得当所述输出电压V2的电压值为输出电压值阈值时，所述比较器P3能输出高电压信号，并在此基础上调低一级所述脉宽调制信号的占空比后，所述比较器P3输出低电压信号，并此时所述升压电路12提供的输出电压V2仍然能够驱动所述发光元件发光，所述输出电压的电压值在理想输出电压值范围内。
在本公开至少一实施例中，所述脉宽调制信号提供电路、所述主控电路和所述比较器集成于控制器中；或者，
所述驱动电路还包括第二数字输入输出接口；所述脉宽调制信号提供电路、所述主控电路和所述第二数字输入输出接口集成于控制器中，所述比较器设置于所述控制器外部；所述比较器的输出端通过所述第二数字输入输出接口与所述主控电路电连接。
如图7所示，在图6所示的驱动电路的至少一实施例的基础上，所述脉宽调制信号提供电路P1、所述主控电路P2和所述比较器P3可以集成于控制器M1中，以能够减少采用的器件的个数。
在本公开如图7所示的驱动电路的至少一实施例中，所述电源电路11可以为所述控制器M1提供输入电压V1，以为所述控制器M1供电。
如图8所示，在图6所示的驱动电路的至少一实施例的基础上，所述驱动电路还包括第二数字输入输出接口I2；所述脉宽调制信号提供电路P1、所述主控电路P2和所述第二数字输入输出接口I2集成于控制器M1中，所述 比较器P3设置于所述控制器M1外部；所述比较器P3的输出端通过所述第二数字输入输出接口I2与所述主控电路P2电连接。
在本公开如图8所示的驱动电路的至少一实施例中，所述电源电路11可以为所述控制器M1提供输入电压V1，以为所述控制器M1供电。
本公开如图8所示的驱动电路的至少一实施例在工作时，所述分压电压V0的电压值大于所述参考电压Vref时，所述比较器P3输出高电压信号，当所述分压电压V0的电压值小于所述参考电压Vref时，所述比较器P3输出低电压信号；
当所述比较器P3输出高电压信号至所述第二数字输入输出接口I2时，所述第二数字输入输出接口I2提供高电压信号至所述主控电路P2，当所述主控电路P2接收到高电压信号时，所述主控电路P2向所述脉宽调制信号提供电路P1提供指示调低占空比的占空比调节信号，以控制所述脉宽调制信号提供电路P1逐级调低其提供的脉宽调制信号的占空比，直至所述输出电压V2的电压值下降至所述理想输出电压值范围内；
当所述比较器P3输出低电压信号至所述第二数字输入输出接口I2时，所述第二数字输入输出接口I2提供低电压信号至所述主控电路P2，当所述主控电路P2接收到低电压信号时，所述主控电路P2向所述脉宽调制信号提供电路P1提供指示调高占空比的占空比调节信号，以控制所述脉宽调制信号提供电路P1逐级调高其提供的脉宽调制信号的占空比，直至所述输出电压V2的电压值上升至所述理想输出电压值范围内。
可选的，所述负载包括第三电阻和发光单元；所述第三电阻的第一端与所述升压电路的输出端电连接，所述第三电阻的第二端与所述发光单元的第一端电连接，所述发光单元的第二端与第一电压端电连接；
所述发光单元包括一个发光元件，所述发光元件的第一极为所述发光单元的第一端，所述发光元件的第二极为所述发光单元的第二端；或者，所述发光单元包括N个发光元件，第一发光元件的第一极为所述发光单元的第一端，第n发光元件的第一极与第n-1发光元件的第二极电连接，第N发光元件的第二极为所述发光单元的第二端；N为大于1的整数，n为大于1而小于等于N的整数。
在具体实施时，所述发光单元可以仅包括一个发光元件，或者，所述发光单元可以包括相互串联的多个发光元件。
本公开至少一实施例所述的驱动电路还可以包括通断控制电路和开关电路；所述发光单元的第二端通过所述开关电路与所述第一电压端电连接；
所述开关电路的控制端与所述通断控制电路电连接；
所述通断控制电路用于向所述开关电路的控制端提供开启控制信号或关断控制信号，以控制所述开关电路导通或断开所述发光单元的第二端与所述第一电压端之间的连接。
在本公开至少一实施例中，所述驱动电路还可以包括通断控制电路和开关电路，通断控制电路控制所述开关电路导通或断开所述发光元件的第二端与第一电压端之间的连接，以控制所述发光单元发光或不发光。
如图9所示，在图1所示的驱动电路的至少一实施例的基础上，本公开至少一实施例所述的驱动电路还包括通断控制电路91和开关电路92；所述负载包括第三电阻R3和发光单元90；所述第三电阻R3的第一端与所述升压电路12的输出端电连接，所述第三电阻R3的第二端与所述发光单元90的第一端电连接，所述发光单元90的第二端通过所述开关电路92与第一电压端V01电连接；
所述开关电路92的控制端与所述通断控制电路91电连接；
所述通断控制电路91用于向所述开关电路92的控制端提供开启控制信号或关断控制信号，以控制所述开关电路92导通或断开所述发光单元90的第二端与所述第一电压端V01之间的连接。
如图10所示，在图2所示的驱动电路的至少一实施例的基础上，本公开至少一实施例所述的驱动电路还包括通断控制电路91和开关电路92；所述负载包括第三电阻R3和发光单元90；所述第三电阻R3的第一端与所述升压电路12的输出端电连接，所述第三电阻R3的第二端与所述发光单元90的第一端电连接，所述发光单元90的第二端通过所述开关电路92与第一电压端V01电连接；
所述开关电路92的控制端与所述通断控制电路91电连接；
所述通断控制电路91用于向所述开关电路92的控制端提供开启控制信 号或关断控制信号，以控制所述开关电路92导通或断开所述发光单元90的第二端与所述第一电压端V01之间的连接。
在本公开至少一实施例中，所述第一电压端V01可以为地端或低电压端，但不以此为限。
在本公开至少一实施例中，所述控制电路包括主控电路，所述驱动电路还包括第三数字输入输出接口、第四电阻和开关电路；所述主控电路和所述第三数字输入输出接口集成于控制器中；所述第三数字输入输出接口与所述第四电阻的第一端电连接，所述第四电阻的第二端与所述开关电路的控制端电连接；所述发光单元的第二端通过所述开关电路与所述第一电压端电连接；
所述主控电路用于通过所述第三数字输入输出接口和所述第四电阻，向所述开关电路的控制端提供开启控制信号或关断控制信号，以控制所述开关电路导通或断开所述发光单元的第二端与所述第一电压端之间的连接。
在具体实施时，主控电路可以通过第三数字输入输出接口和第四电阻，向开关电路的控制端提供开启控制信号或关断控制信号，从而控制所述开关电路导通或断开所述发光单元的第二端与所述第一电压端之间的连接，控制所述发光单元发光或不发光。
如图11所示，在图3所示的驱动电路的至少一实施例的基础上，所述检测电路为模数转换器A1，所述驱动电路还包括第三数字输入输出接口I3、第四电阻R4和开关电路92；所述模数转换器A1、所述主控电路P2、所述第三数字输入输出接口I3和所述脉宽调制信号提供电路P1集成于控制器M1中；
所述模数转换器A1分别与所述升压电路12的输入端和所述主控电路P2电连接，用于检测所述输入电压V1，对所述输入电压V1进行模数转换，将得到的数字输入电压提供至所述主控电路P2；
所述主控电路P2根据所述数字输入电压得到所述输入电压V1的电压值；所述主控电路P2中预存有查找表；所述查找表中存储有所述输入电压的电压值与所述占空比之间的对应关系；
所述主控电路P2与所述脉宽调制信号提供电路P1电连接，用于根据所述输入电压的电压值，在所述查找表中查找相应的占空比，向所述脉宽调制信号提供电路P1提供相应的占空比调节信号，以使得所述脉宽调制信号提供 电路P1根据所述占空比调节信号调节提供的脉宽调制信号的占空比；
所述负载包括第三电阻R3和发光单元90；所述第三电阻R3的第一端与所述升压电路12的输出端电连接，所述第三电阻R3的第二端与所述发光单元90的第一端电连接，所述发光单元90的第二端通过所述开关电路92与第一电压端V01电连接；
所述第三数字输入输出接口I3与所述第四电阻R4的第一端电连接，所述第四电阻R4的第二端与所述开关电路92的控制端电连接；
所述主控电路P2用于通过所述第三数字输入输出接口I3和所述第四电阻R4，向所述开关电路92的控制端提供开启控制信号或关断控制信号，以控制所述开关电路92导通或断开所述发光单元90的第二端与所述第一电压端V01之间的连接。
在本公开至少一实施例中，所述开关电路92可以包括开关晶体管，所述开关晶体管的控制极为所述开关电路92的控制端，所述开关晶体管的第一极与所述发光单元90的第二端电连接，所述开关晶体管的第二极与所述第一电压端V01电连接；
当所述开关晶体管为n型晶体管时，当需要控制所述发光单元90不发光时，所述主控电路P2通过第三数字输入输出接口I3和所述第四电阻R4，向所述开关晶体管的控制极提供低电压信号，以控制所述开关晶体管断开，控制所述发光单元90不发光；
当所述开关晶体管为n型晶体管时，当需要控制所述发光单元90能够发光时，所述主控电路P2通过第三数字输入输出接口I3和所述第四电阻R4，向所述开关晶体管的控制极提供高电压信号，以控制所述开关晶体管导通，控制所述发光单元90能够发光；
当所述开关晶体管为p型晶体管时，当需要控制所述发光单元90不发光时，所述主控电路P2通过第三数字输入输出接口I3和所述第四电阻R4，向所述开关晶体管的控制极提供高电压信号，以控制所述开关晶体管断开，控制所述发光单元90不发光；
当所述开关晶体管为p型晶体管时，当需要控制所述发光单元90能够发光时，所述主控电路P2通过第三数字输入输出接口I3和所述第四电阻R4， 向所述开关晶体管的控制极提供低电压信号，以控制所述开关晶体管导通，控制所述发光单元90能够发光。
可选的，所述升压电路包括第一二极管、第二二极管和第一电容；
所述第一二极管的阳极与所述升压电路的输入端电连接，所述第一二极管的阴极与所述第二二极管的阳极电连接，所述第二二极管的阴极与所述升压电路的输出端电连接；
所述第一电容的第一端与所述第一二极管的阴极电连接，所述第一电容的第二端与所述脉宽调制信号提供电路的输出端电连接；
所述脉宽调制信号提供电路通过其输出端输出所述脉宽调制信号。
可选的，所述升压电路还可以包括第一滤波电容；所述第一滤波电容的第一端与所述升压电路的输出端电连接，所述第一滤波电容的第二端与第一电压端电连接。
在本公开至少一实施例中，所述升压电路还可以包括用于滤波的第一滤波电容，可以使得所述输出电压从脉冲电压变为平缓稳定电压。
可选的，所述升压电路可以包括A级升压子电路；A为大于1的整数；
第a级升压子电路包括第2a-1二极管、第2a二极管、第a电容和第a滤波电容；a为小于或等于A的正整数；
所述第2a-1二极管的阳极与第a输入节点电连接，所述第2a-1二极管的阴极与第a中间节点电连接；
所述第2a二极管的阳极与所述第a中间节点电连接，所述第2a二极管的阴极与第a输出节点电连接；
第一输入节点为所述升压电路的输入端，第A输出节点为所述升压电路的输出端，第b输入节点为第b-1输出节点，b为大于1而小于等于A的整数。
在具体实施时，所述升压电路还可以包括至少两级升压子电路，使得所述升压电路提供的输出电压的电压值更高，当所述发光单元包括多个相互串联的发光元件时，所述升压电路提供的输出电压也能够稳定的驱动所述发光元件发光。
在本公开至少一实施例中，所述升压电路还包括A个滤波电容；
第a滤波电容的第一端与所述第a输出节点电连接，所述第a滤波电容的第二端与第一电压端电连接。
在本公开至少一实施例中，所述升压电路还可以包括用于滤波的A个滤波电容，可以使得所述输出电压从脉冲电压变为平缓稳定电压。
可选的，所述电源电路包括电池；
所述电池的正极与所述升压电路的输入端电连接，所述电池的负极与第一电压端电连接。
如图12所示，在图3所示的驱动电路的至少一实施例的基础上，所述检测电路为模数转换器A1，所述模数转换器A1、所述脉宽调制信号提供电路P1和主控电路P2集成于控制器M1中；所述负载包括第三电阻R3和第一发光二极管L1；所述第三电阻R3的第二端与所述第一发光二极管L1的阳极电连接，所述第一发光二极管L1的阴极与地端G1电连接；
所述电源电路包括电池BT1；所述升压电路12包括第一二极管D1、第二二极管D2、第一电容C1和第一滤波电容C01；
所述第一二极管D1的阳极与所述电池BT1的正极电连接，所述第一二极管D1的阴极与所述第二二极管D2的阳极电连接，所述第二二极管D2的阴极与所述第三电阻R3的第一端电连接；所述电池BT1的负极与地端G1电连接；
所述第一二极管D1的阳极接入输入电压V1；所述升压电路12通过所述第二二极管D2的阴极提供输出电压V2；
所述第一电容C1的第一端与所述第一二极管D1的阴极电连接，所述第一电容C1的第二端与所述脉宽调制信号提供电路P1的输出端电连接；
所述脉宽调制信号提供电路P1用于通过其输出端输出所述脉宽调制信号；
所述第一滤波电容C01的第一端与所述第二二极管D2的阴极电连接，所述第一滤波电容C01的第二端与地端G1电连接；
所述模数转换器A1分别与所述升压电路12的输入端和所述主控电路P2电连接，用于检测所述输入电压V1，对所述输入电压V1进行模数转换，将得到的数字输入电压提供至所述主控电路P2；
所述主控电路P2根据所述数字输入电压得到所述输入电压V1的电压值；所述主控电路P2中预存有查找表；所述查找表中存储有所述输入电压的电压值与所述占空比之间的对应关系；
所述主控电路P2与所述脉宽调制信号提供电路P1电连接，用于根据所述输入电压的电压值，在所述查找表中查找相应的占空比，向所述脉宽调制信号提供电路P1提供相应的占空比调节信号，以使得所述脉宽调制信号提供电路P1根据所述占空比调节信号调节提供的脉宽调制信号的占空比。
在本公开如图12所示的驱动电路的至少一实施例中，所述电池BT1提供的输入电压V1的电压值可以为输入电压值VDD，VDD可以大于等于1.8V而小于等于3V，第一二极管D1的压降Vf1和第二二极管D2的压降Vf2可以为0.3V，但不以此为限。
本公开如图12所示的驱动电路的至少一实施例的结构简单，能够在低成本的前提下，采用低压即能正常驱动发光二极管发光。
本公开至少一实施例所述的驱动电路由脉宽调制信号驱动储能元件(所述升压电路包括的电容)上的电荷在电池和负载之间来回搬移实现升压，并通过调节所述脉宽调制信号的占空比即可控制所述输出电压的电压值。
在图12中，标号为N1的为与所述第一电容C1的第一端电连接的第一节点。
在本公开至少一实施例中，所述第一二极管D1的作用是防止第一节点N1的电压变化对电池端造成影响，所述第二二极管D2的作用是防止所述输出电压V2对第一电容C1的储能造成影响。
在本公开至少一实施例中，所述电池BT1可以为控制器M1提供电源电压，则当所述电池BT1提供的输入电压V1的电压值为输入电压值VDD时，所述脉宽调制信号提供电路P1提供的脉宽调制信号的电位可以在0V与VDD之间切换。
在本公开至少一实施例中，所述控制器M1可以为MCU(微控制器)，MCU可以为低压控制器。
在本公开至少一实施例中，所述第一发光二极管L1可以为白色发光二级管或蓝光发光二极管，但不以此为限。在实际操作时，所述第一发光二极管 L1也可以为其他颜光发光二极管，例如红光发光二极管、绿光发光二极管。
本公开如图12所示的驱动电路的至少一实施例在工作时，如图13A所示，所述脉宽调制信号提供电路P2提供的脉宽调制信号的电压值Va在2V与0V之间变换；
如图13B所示，当所述脉宽调制信号的电压值Va为0V时，第一节点N1的电位Vn1为VDD-Vf；
当所述脉宽调制信号的电压值Va为VDD时，第一节点N1的电位Vn1为2VDD-Vf；
通过第一滤波电容C01的作用，将输出电压V2变换为平缓稳定电压；
通过调节所述脉宽调制信号的占空比，可以调节所述输出电压V2的有效值。
在图13C中，标号为V02的为所述输出电压V2的电压值。
如图14所示，在图3所示的驱动电路的至少一实施例的基础上，所述检测电路为模数转换器A1，所述模数转换器A1、所述脉宽调制信号提供电路P1和主控电路P2集成于控制器M1中；所述负载包括第三电阻R3和第一发光二极管L1；所述第三电阻R3的第二端与所述第一发光二极管L1的阳极电连接，所述第一发光二极管L1的阴极与地端G1电连接；
所述电源电路包括电池BT1；所述升压电路12包括第一二极管D1、第二二极管D2和第一电容C1；
所述第一二极管D1的阳极与所述电池BT1的正极电连接，所述第一二极管D1的阴极与所述第二二极管D2的阳极电连接，所述第二二极管D2的阴极与所述第三电阻R3的第一端电连接；所述电池BT1的负极与地端G1电连接；
所述第一二极管D1的阳极接入输入电压V1；所述升压电路12通过所述第二二极管D2的阴极提供输出电压V2；
所述第一电容C1的第一端与所述第一二极管D1的阴极电连接，所述第一电容C1的第二端与所述脉宽调制信号提供电路P1的输出端电连接；
所述脉宽调制信号提供电路P1用于通过其输出端输出所述脉宽调制信号；
所述模数转换器A1分别与所述升压电路12的输入端和所述主控电路P2电连接，用于检测所述输入电压V1，对所述输入电压V1进行模数转换，将得到的数字输入电压提供至所述主控电路P2；
所述主控电路P2根据所述数字输入电压得到所述输入电压V1的电压值；所述主控电路P2中预存有查找表；所述查找表中存储有所述输入电压的电压值与所述占空比之间的对应关系；
所述主控电路P2与所述脉宽调制信号提供电路P1电连接，用于根据所述输入电压的电压值，在所述查找表中查找相应的占空比，向所述脉宽调制信号提供电路P1提供相应的占空比调节信号，以使得所述脉宽调制信号提供电路P1根据所述占空比调节信号调节提供的脉宽调制信号的占空比。
在本公开如图14所示的驱动电路的至少一实施例中，所述电池BT1提供的输入电压V1的电压值可以为输入电压值VDD，VDD可以大于等于1.8V而小于等于3V，第一二极管D1的压降Vf1和第二二极管D2的压降Vf2可以为0.3V，但不以此为限。
本公开如图14所示的驱动电路的至少一实施例的结构简单，能够在低成本的前提下，采用低压即能正常驱动发光二极管发光。
本公开至少一实施例所述的驱动电路由脉宽调制信号驱动储能元件(所述升压电路包括的电容)上的电荷在电池和负载之间来回搬移实现升压，并通过调节所述脉宽调制信号的占空比即可控制所述输出电压的电压值。
在图14中，标号为N1的为与所述第一电容C1的第一端电连接的第一节点。
在本公开至少一实施例中，所述第一二极管D1的作用是防止第一节点N1的电压变化对电池端造成影响，所述第二二极管D2的作用是防止所述输出电压V2对第一电容C1的储能造成影响。
在本公开至少一实施例中，所述电池BT1可以为控制器M1提供电源电压，则当所述电池BT1提供的输入电压V1的电压值为输入电压值VDD时，所述脉宽调制信号提供电路P1提供的脉宽调制信号的电位可以在0V与VDD之间切换。
本公开如图14所示的驱动电路的至少一实施例在工作时，如图15A所 示，所述脉宽调制信号提供电路P2提供的脉宽调制信号的电压值Va在2V与0V之间变换；
如图15B所示，当所述脉宽调制信号的电压值Va为0V时，第一节点N1的电位Vn1为VDD-Vf，所述输出电压V2的电压值V02为VDD-2Vf；
当所述脉宽调制信号的电压值Va为VDD时，第一节点N1的电位Vn1为2VDD-Vf，所述输出电压V2的电压值V02为2VDD-Vf；
通过调节所述脉宽调制信号的占空比，可以调节所述输出电压V2的有效值。
在图15C中，标号为V02的为所述输出电压V2的电压值。
如图16所示，在图4所示的驱动电路的至少一实施例的基础上，所述检测电路为模数转换器A1，所述模数转换器A1、所述脉宽调制信号提供电路P1和主控电路P2集成于控制器M1中；所述负载包括第三电阻R3和第一发光二极管L1；所述第三电阻R3的第二端与所述第一发光二极管L1的阳极电连接，所述第一发光二极管L1的阴极与地端G1电连接；
所述电源电路包括电池BT1；所述升压电路12包括第一二极管D1、第二二极管D2、第一电容C1和第一滤波电容C01；
所述第一二极管D1的阳极与所述电池BT1的正极电连接，所述第一二极管D1的阴极与所述第二二极管D2的阳极电连接，所述第二二极管D2的阴极与所述第三电阻R3的第一端电连接；所述电池BT1的负极与地端G1电连接；
所述第一二极管D1的阳极接入输入电压V1；所述升压电路12通过所述第二二极管D2的阴极提供输出电压V2；
所述第一电容C1的第一端与所述第一二极管D1的阴极电连接，所述第一电容C1的第二端与所述脉宽调制信号提供电路P1的输出端电连接；
所述脉宽调制信号提供电路P1用于通过其输出端输出所述脉宽调制信号；
所述第一滤波电容C01的第一端与所述第二二极管D2的阴极电连接，所述第一滤波电容C01的第二端与地端G1电连接；
所述模数转换器A1分别与所述升压电路12的输出端和所述主控电路P2 电连接，用于检测所述输出电压V2，对所述输出电压V2进行模数转换，将得到的数字输出电压提供至所述主控电路P2；
所述主控电路P2用于根据所述数字输出电压得到所述输出电压V2的电压值，比较所述输出电压V2的电压值与输出电压值阈值，根据比较结果向所述脉宽调制信号提供电路P1提供相应的占空比调节信号。
在本公开如图16所示的驱动电路的至少一实施例中，所述电池BT1提供的输入电压V1的电压值可以为输入电压值VDD，VDD可以大于等于1.8V而小于等于3V，第一二极管D1的压降Vf1和第二二极管D2的压降Vf2可以为0.3V，但不以此为限。
在本公开如图16所示的驱动电路的至少一实施例中，所述主控电路P2根据所述输出电压V2的电压值来控制调节所述脉宽调制信号的占空比，此时占空比调节策略由查表法改为反馈法，即所述控制电路14实时采集所述输出电压，程序内置一期望的理想电压值(所述理想电压值即为输出电压值阈值)，所述理想电压值既可以保证第一发光二极管L1的发光强度，也考虑了发光效率，尽量减少不必要的损耗。当所述主控电路P2判断到所述输出电压的电压值高于所述输出电压值阈值时，所述主控电路P2控制所述脉宽调制信号提供电路P1逐级调低所述占空比，直至所述输出电压的电压值降低至理想输出电压值范围内；当所述主控电路P2判断到所述输出电压的电压值低于所述输出电压值阈值时，所述主控电路P2控制所述脉宽调制信号提供电路P1逐级调高所述占空比，直至所述输出电压的电压值提升至理想输出电压值范围内。这个调节过程可以在十毫秒级到百毫秒级内完成，对第一发光二极管L1的指示效果影响不大。
如图17所示，在图5所示的驱动电路的至少一实施例的基础上，所述负载包括第三电阻R3和第一发光二极管L1；所述第三电阻R3的第二端与所述第一发光二极管L1的阳极电连接，所述第一发光二极管L1的阴极与地端G1电连接；
所述电源电路包括电池BT1；所述升压电路12包括第一二极管D1、第二二极管D2、第一电容C1和第一滤波电容C01；
所述第一二极管D1的阳极与所述电池BT1的正极电连接，所述第一二 极管D1的阴极与所述第二二极管D2的阳极电连接，所述第二二极管D2的阴极与所述第三电阻R3的第一端电连接；所述电池BT1的负极与地端G1电连接；
所述第一二极管D1的阳极接入输入电压V1；所述升压电路12通过所述第二二极管D2的阴极提供输出电压V2；
所述第一电容C1的第一端与所述第一二极管D1的阴极电连接，所述第一电容C1的第二端与所述脉宽调制信号提供电路P1的输出端电连接；
所述脉宽调制信号提供电路P1用于通过其输出端输出所述脉宽调制信号；
所述第一滤波电容C01的第一端与所述第二二极管D2的阴极电连接，所述第一滤波电容C01的第二端与地端G1电连接；
所述分压电路51可以包括第一电阻R1和第二电阻R2；
所述第一电阻R1的第一端与所述所述第二二极管D2的阴极电连接，所述第一电阻R1的第二端与所述第二电阻R2的第一端电连接；
所述第二电阻R2的第二端与地端G1电连接；
所述第一电阻R1和所述第二电阻R2对所述输出电压V2进行分压，并通过第一电阻R1的第二端提供分压电压V0，并将所述分压电压V0提供至所述第一数字输入输出接口I1；
所述主控电路P2分别与所述第一数字输入输出接口I1和所述脉宽调制信号提供电路P1电连接，用于根据所述第一数字输入输出接口I1提供的电压信号，向所述脉宽调制信号提供电路P1提供相应的占空比调节信号。
本公开图17所示的驱动电路的至少一实施例在工作时，需要通过设置第一电阻R1的电阻值和第二电阻R2的电阻值，通过仔细计算第一电阻R1和第二电阻R2的分压比例，使得当所述输出电压V2的电压值为输出电压值阈值时，所述分压电压V0刚好能够被第一数字输入输出接口I1识别为高电压信号，并在此基础上调低一级占空比后，所述分压电压V0被所述第一数字输入输出接口I1识别为低电压信号，但是此时所述升压电路12提供的输出电压V2仍能够驱动所述第一发光二级管L1发光，所述输出电压V2的电压值在理想输出电压值范围内。
需要注意的是，在本公开至少一实施例中，所述控制器M1的数字输入输出接口具有较为分明的高低电平分界点，设计者在设计时需要通过芯片规格书和实际测试确定所述高低电平分界点，并以此设计分压电路的参数。例如，所述高低电平分界点可以是1.0V、2.0V、2.5V等电压值，但并不以此为限。同时还要求所述数字输入输出接口具有较小的滞回电压值，如不大于0.2V，否则会影响输出电压恒定的特性或调整时间。
在本公开至少一实施例中，当所述控制器的数字输入输出接口接入的电压信号的电压值大于所述高低电平分界点时，该电压信号被该数字输入输出接口识别为高电压信号，当所述控制器的数字输入输出接口接入的电压信号的电压值小于所述高低电平分界点时，该电压信号被该数字输入输出接口识别为低电压信号。
本公开图17所示的驱动电路的至少一实施例在工作时，可以先控制所述脉宽调制信号提供电路P1提供的脉宽调制信号的占空比为50％，当所述第一数字输入输出接口I1检测到高电压信号时，逐级减小所述脉宽调制信号的占空比，直到所述第一数字输入输出接口I1检测到低电压信号，保持此时的占空比驱动。
本公开如17所示的驱动电路的至少一实施例的调节占空比的控制策略也可以与上不相同，对此对所述控制策略不进行限定，仅需能够控制所述驱动电路工作时，所述输出电压V2的电压值在理想输出电压值范围内即可。
在本公开图17所示的驱动电路的至少一实施例中，所述第一电阻R1的电阻值与所述第二电阻R2的电阻值可以较大，以减少额外损耗。
在本公开如图17所示的驱动电路的至少一实施例中，所述电池BT1提供的输入电压V1的电压值可以为输入电压值VDD，VDD可以大于等于1.8V而小于等于3V，第一二极管D1的压降Vf1和第二二极管D2的压降Vf2可以为0.3V，但不以此为限。
本公开如图17所示的驱动电路的至少一实施例的结构简单，能够在低成本的前提下，采用低压即能正常驱动发光二极管发光。
如图18所示，在图7所示的驱动电路的至少一实施例的基础上，所述负载包括第三电阻R3和第一发光二极管L1；所述第三电阻R3的第二端与所述 第一发光二极管L1的阳极电连接，所述第一发光二极管L1的阴极与地端G1电连接；
所述电源电路包括电池BT1；所述升压电路12包括第一二极管D1、第二二极管D2、第一电容C1和第一滤波电容C01；
所述第一二极管D1的阳极与所述电池BT1的正极电连接，所述第一二极管D1的阴极与所述第二二极管D2的阳极电连接，所述第二二极管D2的阴极与所述第三电阻R3的第一端电连接；所述电池BT1的负极与地端G1电连接；
所述第一二极管D1的阳极接入输入电压V1；所述升压电路12通过所述第二二极管D2的阴极提供输出电压V2；
所述第一电容C1的第一端与所述第一二极管D1的阴极电连接，所述第一电容C1的第二端与所述脉宽调制信号提供电路P1的输出端电连接；
所述脉宽调制信号提供电路P1用于通过其输出端输出所述脉宽调制信号；
所述第一滤波电容C01的第一端与所述第二二极管D2的阴极电连接，所述第一滤波电容C01的第二端与地端G1电连接；
所述分压电路51可以包括第一电阻R1和第二电阻R2；
所述第一电阻R1的第一端与所述第二二极管D2的阴极电连接，所述第一电阻R1的第二端与所述第二电阻R2的第一端电连接；
所述第二电阻R2的第二端与地端G1电连接；
所述第一电阻R1和所述第二电阻R2对所述输出电压V2进行分压，并通过第一电阻R1的第二端提供分压电压V0，并将所述分压电压V0提供至所述比较器P3的正相输入端。
本公开如图18所示的驱动电路的至少一实施例在工作时，可以先控制所述脉宽调制信号提供电路P1提供的脉宽调制信号的占空比为50％，当所述比较器P3输出高电压信号时，逐级减小所述脉宽调制信号的占空比，直到所述比较器P3输出低电压信号，保持此时的占空比驱动。
本公开如18所示的驱动电路的至少一实施例的调节占空比的控制策略也可以与上不相同，对此对所述控制策略不进行限定，仅需能够控制所述驱 动电路工作时，所述输出电压V2的电压值在理想输出电压值范围内即可。
在本公开图18所示的驱动电路的至少一实施例中，所述脉宽调制信号提供电路P1、所述主控电路P2和所述比较器P3可以集成于控制器M1中，以能够减少采用的器件的个数。
在本公开如图18所示的驱动电路的至少一实施例中，所述电池BT1提供的输入电压V1的电压值可以为输入电压值VDD，VDD可以大于等于1.8V而小于等于3V，第一二极管D1的压降Vf1和第二二极管D2的压降Vf2可以为0.3V，但不以此为限。
本公开如图18所示的驱动电路的至少一实施例的结构简单，能够在低成本的前提下，采用低压即能正常驱动发光二极管发光。
本公开如图19所示的驱动电路的至少一实施例与本公开图18所示的驱动电路的至少一实施例的区别如下：所述比较器P3设置于所述控制器M1外部；
本公开如图19所示的驱动电路的至少一实施例还包括第二数字输入输出接口I2；所述第二数字输入输出接口I2集成于控制器M1中，所述比较器P3的输出端通过所述第二数字输入输出接口I2与所述主控电路P2电连接。
本公开如图19所示的驱动电路的至少一实施例在工作时，可以先控制所述脉宽调制信号提供电路P1提供的脉宽调制信号的占空比为50％，当所述比较器P3输出高电压信号，所述第二数字输入输出接口I2接收到高电压信号时，逐级减小所述脉宽调制信号的占空比，直到所述比较器P3输出低电压信号，所述第二数字输入输出接口I2接收到低电压信号，保持此时的占空比驱动。
本公开如19所示的驱动电路的至少一实施例的调节占空比的控制策略也可以与上不相同，对此对所述控制策略不进行限定，仅需能够控制所述驱动电路工作时，所述输出电压V2的电压值在理想输出电压值范围内即可。
如图20所示，在本公开图11所示的驱动电路的至少一实施例的基础上，所述负载包括第三电阻R3和第一发光二极管L1；所述第三电阻R3的第二端与所述第一发光二极管L1的阳极电连接；
所述电源电路包括电池BT1；所述升压电路12包括第一二极管D1、第 二二极管D2、第一电容C1和第一滤波电容C01；
所述第一二极管D1的阳极与所述电池BT1的正极电连接，所述第一二极管D1的阴极与所述第二二极管D2的阳极电连接，所述第二二极管D2的阴极与所述第三电阻R3的第一端电连接；所述电池BT1的负极与地端G1电连接；
所述第一二极管D1的阳极接入输入电压V1；所述升压电路12通过所述第二二极管D2的阴极提供输出电压V2；
所述第一电容C1的第一端与所述第一二极管D1的阴极电连接，所述第一电容C1的第二端与所述脉宽调制信号提供电路P1的输出端电连接；
所述脉宽调制信号提供电路P1用于通过其输出端输出所述脉宽调制信号；
所述第一滤波电容C01的第一端与所述第二二极管D2的阴极电连接，所述第一滤波电容C01的第二端与地端G1电连接；
所述开关电路92包括开关晶体管Q1；
所述第三数字输入输出接口I3与所述第四电阻R4的第一端电连接，所述第四电阻R4的第二端与所述所述开关晶体管Q1的栅极电连接；
所述开关晶体管Q1的漏极与所述第一发光二极管L1的阴极电连接，所述开关晶体管Q1的源极与地端G1电连接。
在本公开如图20所示的驱动电路的至少一实施例中，所述电池BT1提供的输入电压V1的电压值可以为输入电压值VDD，VDD可以大于等于1.8V而小于等于3V，第一二极管D1的压降Vf1和第二二极管D2的压降Vf2可以为0.3V，但不以此为限。
本公开如图20所示的驱动电路的至少一实施例的结构简单，能够在低成本的前提下，采用低压即能正常驱动发光二极管发光。
在图20所示的驱动电路的至少一实施例中，所述开关晶体管Q1为NMOS晶体管(N型金属-氧化物-半导体晶体管)，但不以此为限。在实际操作时，所述开关晶体管Q1可以为n型晶体管或p型晶体管，所述开关晶体管Q1可以为三极管、MOS管或薄膜晶体管。在此对所述开关晶体管Q1的类型不作限定。
本公开如图20所示的驱动电路的至少一实施例在工作时，
当需要控制所述第一发光二极管L1不发光时，所述主控电路P2用于通过所述第三数字输入输出接口I3和所述第四电阻R4，向所述开关电路92的控制端提供低电压信号，以控制所述开关晶体管Q1关断，控制所述第一发光二极管L1的阴极与所述第一电压端V01之间断开；
当需要控制所述第一发光二极管L1能够发光时，所述主控电路P2用于通过所述第三数字输入输出接口I3和所述第四电阻R4，向所述开关电路92的控制端提供高电压信号，以控制所述开关晶体管Q1导通，控制所述第一发光二极管L1的阴极与所述第一电压端V01之间连通。
在本公开至少一实施例中，在图3所示的驱动电路的至少一实施例的基础上，如图21所示，所述检测电路包括模数转换器A1；所述模数转换器A1和所述脉宽调制信号提供电路P1集成于控制器M1中；
所述电源电路包括电池BT1；
所述升压电路包括第一级升压子电路121、第二级升压子电路122和第三级升压电路123；
所述第一级升压子电路121包括第一二极管D1、第二二极管D2、第一电容C1和第一滤波电容C01；
所述第二级升压子电路122包括第三二极管D3、第四二极管D4、第二电容C2和第二滤波电容C02；
所述第三级升压子电路123包括第五二极管D5、第六二极管D6、第三电容C3和第三滤波电容C03；
D1的阳极与所述电池BT1的正极电连接，D1的阴极与D2的阳极电连接；所述电池BT1的负极与地端G1电连接；
C1的第一端与D1的阴极电连接，C1的第二端与所述脉宽调制信号提供电路P1的输出端电连接，所述脉宽调制信号提供电路P1用于通过其输出端输出脉宽调制信号；
C01的第一端与D2的阴极电连接，C01的第二端与地端G1电连接；
D3的阳极与D2的阴极连接，D3的阴极与D4的阳极电连接；
C2的第一端与D3的阴极电连接，C2的第二端与所述脉宽调制信号提供 电路P1的输出端电连接；
C02的第一端与D4的阴极电连接，C02的第二端与地端G1电连接；
D5的阳极与D4的阴极电连接，D5的阴极与D6的阳极电连接；
C3的第一端与D5的阴极电连接，C3的第二端与所述脉宽调制信号提供电路P1的输出端电连接；
C03的第一端与D6的阴极电连接，C03的第二端与地端G1电连接；
所述负载包括第三电阻R3、第一发光二极管L1、第二发光二极管L2、第三发光二极管L3和第四发光二极管L4；
R3的第一端与D6的阴极电连接，R3的第二端与L1的阳极电连接；
L1的阴极与L2的阳极电连接，L2的阴极与L3的阳极电连接，L3的阴极与L4的阳极电连接，L4的阴极与地端G1电连接；
D1的阳极接入输入电压V1；所述升压电路通过D6的阴极提供输出电压V2。
在本公开图21所示的驱动电路的至少一实施例中，所述第一发光二极管L1可以为红光发光二极管、所述第二发光二极管L2可以为绿光发光二极管，所述第三发光二极管L3可以为绿光发光二极管，所述第四发光二极管L4可以为白光发光二极管，但不以此为限。在实际操作时，所述第一发光二极管L1、所述第二发光二极管L2和所述第三发光二极管L3可以封装在一起。
在本公开图21所示的驱动电路的至少一实施例中，所述控制器M1可以为MCU(微控制单元)。
在本公开至少一实施例中，可以增加升压电路包括的升压子电路的级数，使得所述输出电压V2的电压值更高，对于一般MCU来说，升压电路包括的升压子电路的级数不大于3级，否则数字输入输出接口的瞬时电流可能超过数字输入输出接口的容限。对于多级升压，通常可以有多种不同拓扑类型的设计。图21只示意出了其中一种。
当所述升压电路采用了多级升压子电路时，可驱动的发光二极管的数量可以估算为：(V02-Vr3)/Vled；其中，V02为所述输出电压V2的电压值，Vr3为第三电阻R3两端的电压(所述第三电阻R3可以为限流电阻)，Vled为各发光二极管在一定工作电流下的两端压降；在一般情况下，蓝光发光二 极管的Vled和白光发光二极管的Vled为3V左右。
在实际操作时，Vr3可以根据实际情况选定，Vr3与流过发光二极管的电流相关。
在本公开至少一实施例中，所述升压电路中的二极管的压降越小越好。在优选情况下，所述升压电路采用的二极管为肖特基二极管，其压降约为0.3V但不以此为限。
本公开实施例所述的驱动方法用于驱动负载，所述负载包括发光元件，所述驱动方法应用于本公开至少一实施例所述的驱动电路，所述驱动方法包括：
电源电路为升压电路的输入端提供输入电压；
脉宽调制信号提供电路为所述升压电路提供脉宽调制信号；
升压电路根据所述脉宽调制信号，对所述输入电压进行升压，以得到输出电压，并通过所述输出电压驱动所述负载；
控制电路根据所述输入电压或所述输出电压，向所述脉宽调制信号提供电路提供占空比调节信号，控制所述脉宽调制信号提供电路根据所述占空比调节信号，调节所述脉宽调制信号的占空比。
本公开实施例所述的驱动方法能够通过所述控制电路根据所述输入电压或所述输出电压，控制所述脉宽调制信号提供电路提供的脉宽调制信号的占空比，从而能够控制所述输出电压能够维持在恰好能够控制所述发光元件发光的强度，进而能够提升电源转换效率。
在本公开至少一实施例中，所述控制电路中预存有查找表，所述查找表中存储有所述输入电压的电压值与所述占空比之间的对应关系；
所述控制电路根据所述输入电压或所述输出电压，向所述脉宽调制信号提供电路提供占空比调节信号，控制所述脉宽调制信号提供电路根据所述占空比调节信号，调节所述脉宽调制信号的占空比步骤包括：
所述控制电路根据所述输入电压的电压值，在所述查找表中查找相应的占空比，向所述脉宽调制信号提供电路提供相应的占空比调节信号，以使得所述脉宽调制信号提供电路根据所述占空比调节信号调节提供的脉宽调制信号的占空比。
在具体实施时，所述控制电路可以根据所述输入电压控制调节所述脉宽调制信号的占空比，此时可以采用查表法，所述控制电路根据所述输入电压的电压值，在所述查找表中查找相应的占空比，控制所述脉宽调制信号提供电路提供的脉宽调制信号的占空比为该相应的占空比。
在本公开至少一实施例中，所述控制电路根据所述输入电压或所述输出电压，向所述脉宽调制信号提供电路提供占空比调节信号，控制所述脉宽调制信号提供电路根据所述占空比调节信号，调节所述脉宽调制信号的占空比步骤包括：
所述控制电路比较所述输出电压的电压值与输出端电压阈值；
当所述控制电路判断到所述输出电压的电压值高于输出电压值阈值时，所述控制电路控制所述脉宽调制信号提供电路逐级调低所述占空比，直至所述输出电压的电压值降低至理想输出电压值范围内；
当所述控制电路判断到所述输出电压的电压值低于所述输出电压值阈值时，所述控制电路控制所述脉宽调制信号提供电路逐级调高所述占空比，直至所述输出电压的电压值提升至理想输出电压值范围内。
在具体实施时，所述控制电路可以根据所述输入电压控制调节所述脉宽调制信号的占空比，此时可以采用反馈法，通过控制电路判断所述输出电压的电压值高于所述输出电压值阈值或低于所述输出电压值阈值，根据比较结果控制调节所述占空比，直至所述输出电压的电压值在理想输出电压值范围内。
本公开实施例所述的电子价签系统包括负载和上述的驱动电路；
所述负载包括发光元件，所述驱动电路用于驱动所述负载。
本公开至少一实施例所述的电子价签系统还可以包括通信单元、控制器和电子墨水屏；
所述通信单元用于接收价签信息更新信号，并将所述价签信息更新信号提供至所述控制器，所述通信单元还用于接收发光指示信号，并将所述发光指示信号提供至所述控制器；所述价签信息更新信号携带更新后的价签信息；
所述控制器用于在接收到所述价签信息更新信号时，控制所述驱动电路驱动所述发光元件发光，并在接收到所述价签信息更新信号后，将所述价签 信息更新信号携带的价签信息显示于所述电子墨水屏上，并用于在接收到所述发光指示信号时，控制所述驱动电路驱动所述发光元件发光。
在具体实施时，所述驱动电路的部分部件可以集成于所述控制器中。
本公开至少一实施例所述的电子价签系统可以通过所述通信单元接收价签信息更新信号，以及发光指示信号，并将所述信号提供至所述控制器，所述控制器在接收到所述价签信息更新信号时，控制所述驱动电路驱动所述负载包括的发光元件发光，并在接收到所述价签信息更新信号后，将所述价签信息更新信号携带的价签信息显示于所述电子墨水屏上，并在接收到所述发光指示信号时，控制所述驱动电路驱动所述发光元件发光。
如图22所示，本公开至少一实施例所述的电子价签系统包括驱动电路220、负载221、通信单元222、控制器M1和电子墨水屏X1；
所述通信单元22用于接收价签信息更新信号，并将所述价签信息更新信号提供至所述控制器M1，所述通信单元22还用于接收发光指示信号，并将所述发光指示信号提供至所述控制器M1；所述价签信息更新信号携带更新后的价签信息；
所述控制器M1用于在接收到所述价签信息更新信号时，控制所述驱动电路220驱动所述发光元件发光，并在接收到所述价签信息更新信号后，将所述价签信息更新信号携带的价签信息显示于所述电子墨水屏X1上，并用于在接收到所述发光指示信号时，控制所述驱动电路220驱动所述发光元件发光。
在本公开至少一实施例中，所述驱动电路220包括的部分器件可以集成于所述控制器M1中。
如图23所示，在图22所示的电子价签系统的至少一实施例的基础上，所述通信单元可以包括射频收发单元A2和NFC(Near Field Communication，近场通信)单元230，所述射频收发单元用于与基站射频通信，所述NFC单元230用于近场通信；
本公开至少一实施例所述的电子价签系统中，所述控制器为电子价签控制器，负责电子墨水屏信息显示，LED状态指示、NFC通信，以及与基站的视频通信；在平时大部分时间，电子价签系统为休眠状态节省电能，所述控 制器会定期自动唤醒查询基站与价签的通信，当有价签信息需要更新时，接收所述价签信息并送电子墨水屏显示，同时驱动所述驱动电路中的升压电路，以让LED指示灯(所述发光元件为所述LED指示灯)进行闪灯提示，或在其他状态下，所述控制器期望有灯光提示的需要时，也会驱动升压电路让LED指示灯发光。
以上所述是本公开的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本公开所述原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本公开的保护范围。

Claims (20)

  1. 一种驱动电路，用于驱动负载，所述负载包括发光元件，所述驱动电路包括电源电路、升压电路、脉宽调制信号提供电路和控制电路；所述升压电路的输入端与电源电路电连接，所述升压电路的输出端与所述负载电连接；
    所述电源电路用于为所述升压电路的输入端提供输入电压；
    所述脉宽调制信号提供电路与所述升压电路电连接，用于为所述升压电路提供脉宽调制信号；
    所述升压电路用于根据所述脉宽调制信号，对所述输入电压进行升压，以得到输出电压，并通过所述输出电压驱动所述负载；
    所述控制电路与所述升压电路电连接，用于根据输入电压或所述输出电压，向所述脉宽调制信号提供电路提供占空比调节信号，控制所述脉宽调制信号提供电路根据所述占空比调节信号，调节所述脉宽调制信号的占空比。
  2. 如权利要求1所述的驱动电路，其中，所述控制电路包括检测电路和主控电路；
    所述检测电路分别与所述升压电路的输入端和所述主控电路电连接，用于检测所述输入电压，并将所述输入电压提供至所述主控电路；
    所述主控电路中预存有查找表；所述查找表中存储有所述输入电压的电压值与所述占空比之间的对应关系；
    所述主控电路与所述脉宽调制信号提供电路电连接，用于根据所述输入电压的电压值，在所述查找表中查找相应的占空比，向所述脉宽调制信号提供电路提供相应的占空比调节信号。
  3. 如权利要求1所述的驱动电路，其中，所述控制电路包括检测电路和主控电路；
    所述检测电路分别与所述升压电路的输出端和所述主控电路电连接，用于检测所述输出电压，并将所述输出电压提供至所述主控电路；
    所述主控电路用于比较所述输出电压的电压值与输出电压值阈值，根据比较结果向所述脉宽调制信号提供电路提供相应的占空比调节信号。
  4. 如权利要求1所述的驱动电路，其中，所述控制电路包括分压电路、 第一数字输入输出接口和主控电路；所述第一数字输入输出接口和所述主控电路集成于控制器中；
    所述分压电路用于对所述输出电压进行分压，得到分压电压，并将所述分压电压提供至所述第一数字输入输出接口；
    所述主控电路分别与所述第一数字输入输出接口和所述脉宽调制信号提供电路电连接，用于根据所述第一数字输入输出接口提供的电压信号，向所述脉宽调制信号提供电路提供相应的占空比调节信号。
  5. 如权利要求1所述的驱动电路，其中，所述控制电路包括分压电路、比较器和主控电路；
    所述分压电路用于对所述输出电压进行分压，得到分压电压，并将所述分压电压提供至所述比较器的正相输入端；
    所述比较器的反相输入端与参考电压端电连接，所述比较器的输出端与所述主控电路电连接，所述比较器用于比较所述分压电压的电压值与所述参考电压端提供的参考电压，根据比较结果输出相应的电压信号；
    所述主控电路用于根据所述电压信号，向所述脉宽调制信号提供电路提供相应的占空比调节信号。
  6. 如权利要求5所述的驱动电路，其中，所述脉宽调制信号提供电路、所述主控电路和所述比较器集成于控制器中；或者，
    所述驱动电路还包括第二数字输入输出接口；所述脉宽调制信号提供电路、所述主控电路和所述第二数字输入输出接口集成于控制器中，所述比较器设置于所述控制器外部；所述比较器的输出端通过所述第二数字输入输出接口与所述主控电路电连接。
  7. 如权利要求4至6中任一权利要求所述的驱动电路，其中，所述分压电路包括第一电阻和第二电阻；
    所述第一电阻的第一端与所述输出端电连接，所述第一电阻的第二端与所述第二电阻的第一端电连接；
    所述第二电阻的第二端与第一电压端电连接。
  8. 如权利要求1至6中任一权利要求所述的驱动电路，其中，所述负载包括第三电阻和发光单元；所述第三电阻的第一端与所述升压电路的输出端 电连接，所述第三电阻的第二端与所述发光单元的第一端电连接，所述发光单元的第二端与第一电压端电连接；
    所述发光单元包括一个发光元件，所述发光元件的第一极为所述发光单元的第一端，所述发光元件的第二极为所述发光单元的第二端；或者，所述发光单元包括N个发光元件，第一发光元件的第一极为所述发光单元的第一端，第n发光元件的第一极与第n-1发光元件的第二极电连接，第N发光元件的第二极为所述发光单元的第二端；N为大于1的整数，n为大于1而小于等于N的整数。
  9. 如权利要求8所述的驱动电路，其中，还包括通断控制电路和开关电路；所述发光单元的第二端通过所述开关电路与所述第一电压端电连接；
    所述开关电路的控制端与所述通断控制电路电连接；
    所述通断控制电路用于向所述开关电路的控制端提供开启控制信号或关断控制信号，以控制所述开关电路导通或断开所述发光单元的第二端与所述第一电压端之间的连接。
  10. 如权利要求8所述的驱动电路，其中，所述控制电路包括主控电路，所述驱动电路还包括第三数字输入输出接口、第四电阻和开关电路；所述主控电路和所述第三数字输入输出接口集成于控制器中；所述第三数字输入输出接口与所述第四电阻的第一端电连接，所述第四电阻的第二端与所述开关电路的控制端电连接；所述发光单元的第二端通过所述开关电路与所述第一电压端电连接；
    所述主控电路用于通过所述第三数字输入输出接口和所述第四电阻，向所述开关电路的控制端提供开启控制信号或关断控制信号，以控制所述开关电路导通或断开所述发光单元的第二端与所述第一电压端之间的连接。
  11. 如权利要求1至7中任一权利要求所述的驱动电路，其中，所述升压电路包括第一二极管、第二二极管和第一电容；
    所述第一二极管的阳极与所述升压电路的输入端电连接，所述第一二极管的阴极与所述第二二极管的阳极电连接，所述第二二极管的阴极与所述升压电路的输出端电连接；
    所述第一电容的第一端与所述第一二极管的阴极电连接，所述第一电容 的第二端与所述脉宽调制信号提供电路的输出端电连接；
    所述脉宽调制信号提供电路通过其输出端输出所述脉宽调制信号。
  12. 如权利要求11所述的驱动电路，其中，所述升压电路还包括第一滤波电容；所述第一滤波电容的第一端与所述升压电路的输出端电连接，所述第一滤波电容的第二端与第一电压端电连接。
  13. 如权利要求1至7中任一权利要求所述的驱动电路，其中，所述升压电路包括A级升压子电路；A为大于1的整数；
    第a级升压子电路包括第2a-1二极管、第2a二极管、第a电容和第a滤波电容；a为小于或等于A的正整数；
    所述第2a-1二极管的阳极与第a输入节点电连接，所述第2a-1二极管的阴极与第a中间节点电连接；
    所述第2a二极管的阳极与所述第a中间节点电连接，所述第2a二极管的阴极与第a输出节点电连接；
    第一输入节点为所述升压电路的输入端，第A输出节点为所述升压电路的输出端，第b输入节点为第b-1输出节点，b为大于1而小于等于A的整数。
  14. 如权利要求13所述的驱动电路，其中，所述升压电路还包括A个滤波电容；
    第a滤波电容的第一端与所述第a输出节点电连接，所述第a滤波电容的第二端与第一电压端电连接。
  15. 如权利要求1至7中任一权利要求所述的驱动电路，其中，所述电源电路包括电池；
    所述电池的正极与所述升压电路的输入端电连接，所述电池的负极与第一电压端电连接。
  16. 一种驱动方法，用于驱动负载，所述负载包括发光元件，应用于如权利要求1至15中任一权利要求所述的驱动电路，所述驱动方法包括：
    电源电路为升压电路的输入端提供输入电压；
    脉宽调制信号提供电路为所述升压电路提供脉宽调制信号；
    升压电路根据所述脉宽调制信号，对所述输入电压进行升压，以得到输 出电压，并通过所述输出电压驱动所述负载；
    控制电路根据所述输入电压或所述输出电压，向所述脉宽调制信号提供电路提供占空比调节信号，控制所述脉宽调制信号提供电路根据所述占空比调节信号，调节所述脉宽调制信号的占空比。
  17. 如权利要求16所述的驱动方法，其中，所述控制电路中预存有查找表，所述查找表中存储有所述输入电压的电压值与所述占空比之间的对应关系；
    所述控制电路根据所述输入电压或所述输出电压，向所述脉宽调制信号提供电路提供占空比调节信号，控制所述脉宽调制信号提供电路根据所述占空比调节信号，调节所述脉宽调制信号的占空比步骤包括：
    所述控制电路根据所述输入电压的电压值，在所述查找表中查找相应的占空比，向所述脉宽调制信号提供电路提供相应的占空比调节信号，以使得所述脉宽调制信号提供电路根据所述占空比调节信号调节提供的脉宽调制信号的占空比。
  18. 如权利要求16所述的驱动方法，其中，所述控制电路根据所述输入电压或所述输出电压，向所述脉宽调制信号提供电路提供占空比调节信号，控制所述脉宽调制信号提供电路根据所述占空比调节信号，调节所述脉宽调制信号的占空比步骤包括：
    所述控制电路比较所述输出电压的电压值与输出端电压阈值；
    当所述控制电路判断到所述输出电压的电压值高于输出电压值阈值时，所述控制电路控制所述脉宽调制信号提供电路逐级调低所述占空比，直至所述输出电压的电压值降低至理想输出电压值范围内；
    当所述控制电路判断到所述输出电压的电压值低于所述输出电压值阈值时，所述控制电路控制所述脉宽调制信号提供电路逐级调高所述占空比，直至所述输出电压的电压值提升至理想输出电压值范围内。
  19. 一种电子价签系统，包括负载和如权利要求1至15中任一权利要求所述的驱动电路；
    所述负载包括发光元件，所述驱动电路用于驱动所述负载。
  20. 如权利要求19所述的电子价签系统，其中，还包括通信单元、控制 器和电子墨水屏；
    所述通信单元用于接收价签信息更新信号，并将所述价签信息更新信号提供至所述控制器，所述通信单元还用于接收发光指示信号，并将所述发光指示信号提供至所述控制器；所述价签信息更新信号携带更新后的价签信息；
    所述控制器用于在接收到所述价签信息更新信号时，控制所述驱动电路驱动所述发光元件发光，并在接收到所述价签信息更新信号后，将所述价签信息更新信号携带的价签信息显示于所述电子墨水屏上，并用于在接收到所述发光指示信号时，控制所述驱动电路驱动所述发光元件发光。
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