WO2023272885A1 - Power supply circuit, driver and controlling method - Google Patents
Power supply circuit, driver and controlling method Download PDFInfo
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- WO2023272885A1 WO2023272885A1 PCT/CN2021/111813 CN2021111813W WO2023272885A1 WO 2023272885 A1 WO2023272885 A1 WO 2023272885A1 CN 2021111813 W CN2021111813 W CN 2021111813W WO 2023272885 A1 WO2023272885 A1 WO 2023272885A1
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- voltage
- power supply
- supply circuit
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims abstract description 6
- 101100369802 Caenorhabditis elegans tim-1 gene Proteins 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 16
- 238000004804 winding Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
Definitions
- Embodiments of the present disclosure generally relate to the field of lighting, and more particularly, to a power supply circuit, a driver and a controlling method.
- a buck circuit includes a diode, an inductor, a capacitor and a switch.
- a controlling signal may control the switch to be on and off, so that the buck circuit can convert an input voltage into an output voltage, which is lower than the input voltage.
- the controlling signal may be PWM (Pulse Width Modulation) signal.
- an auxiliary winding is used to detect a current flowing through the inductor of the buck circuit, and zero cross detecting is performed on the detected current so as to control the switch according to the zero cross detecting result.
- embodiments of the present disclosure provide a power supply circuit, a driver and a controlling method.
- the power supply circuit uses an output compare (OC) reference voltage to set an off state time (Toff) for each cycle of the controlling signal, no auxiliary winding is needed to control the switch, thus to reduce the cost of buck circuit.
- OC output compare
- Toff off state time
- a power supply circuit includes:
- a buck circuit configured to convert input DC (direct current) voltage into output DC voltage
- the buck circuit including a diode, an inductor, a capacitor and a switch, the output DC voltage being outputted from output ports (VOUT+, VOUT -) ;
- a controller configured to output a controlling signal (PWM signal) according to a feedback voltage (Vout) , the feedback voltage being obtained by a voltage detection circuit being connected between one output port and a ground port;
- a MOS Drive circuit configured to drive the switch of the buck circuit according to the controlling signal
- an off state time (Toff) for each cycle of the controlling signal is set according to an output compare (OC) reference voltage.
- an on state time (Ton) for each cycle of the controlling signal is determined by a detected peak current (Ipeak) that flows through the switch.
- the power supply circuit further includes:
- a current peak limiter configured to detect the peak current, and send a break signal to a break pin of the controller, the break signal makes the controlling signal to fall into a low level, so as to end the on state.
- the current peak limiter includes a first comparator (COMP_break) , which compares a voltage corresponding to the peak current with a first reference voltage (Ref) , when the voltage corresponding to the peak current is higher than the first reference voltage, the break signal with low level is generated by the first comparator.
- COMP_break a first comparator
- Ref first reference voltage
- the controller includes:
- a first timer (Tim 1) , configured to define each cycle of the controlling signal by counting, when the first timer is reset, a new cycle starts;
- a second timer (Tim 2) , configured to be reset when the off state of the controlling signal starts,
- the first timer is reset, so as to end the off state of the controlling signal.
- the off state time (Toff) is determined by a fixed ⁇ Ipeak, inductance of the inductor and the feedback voltage (Vout) ,
- the ⁇ Ipeak represents the difference between an Ipeak upper limit and an Ipeak lower limit.
- the off state time (Toff) is determined by a fixed ⁇ Ipeak, inductance of the inductor, an fixed output current (iLED) , the input DC (direct current) voltage (Vin) and the feedback voltage (Vout) , wherein, the ⁇ Ipeak equals to an Ipeak upper limit.
- a driver used for driving a lighting device, the driver includes the power supply circuit according to the first aspect of embodiments and a control circuit, the power supply circuit providing power to the lighting device, the control circuit communicates with the power supply circuit, the control circuit communicates with a peripheral device.
- controlling method of a power supply circuit of the first aspect of embodiments including:
- Toff off state time
- an off state time (Toff) for each cycle of the controlling signal is set according to an output compare (OC) reference voltage, no auxiliary winding is needed to control the switch, thus to reduce the cost of buck circuit.
- Fig. 1 is a diagram of a power supply circuit in accordance with the first aspect of embodiments of the disclosure
- Fig. 2 is a simple circuit topology of the power supply circuit in accordance with the first aspect of embodiments of the disclosure
- Fig. 3 is a full circuit topology of the power supply circuit in accordance with the first aspect of embodiments of the disclosure
- Fig. 4 is a diagram of the controller MCU in accordance with the first aspect of embodiments of the disclosure.
- Fig. 5 is a diagram of working principle of the controller MCU in accordance with the first aspect of embodiments of the disclosure
- Fig. 6 is a Timing Sequence Diagram when the buck circuit works under a CCM or a BCM;
- Fig. 7 is a Timing Sequence Diagram when the buck circuit works under a DCM
- Fig. 8 is a diagram of control method for Toff control with fixed ⁇ Ipeak (or Ipeak) in DCM;
- Fig. 9 is a diagram of state machine of Toff control for power supply circuit in accordance with the first aspect of embodiments of the disclosure.
- Fig. 10 is a diagram of the diver.
- the terms “first” and “second” refer to different elements.
- the singular forms “a” and “an” are intended to include the plural forms as well, unless the context clearly indicates otherwise.
- the term “based on” is to be read as “based at least in part on. ”
- the term “one embodiment” and “an embodiment” are to be read as “at least one embodiment. ”
- the term “another embodiment” is to be read as “at least one other embodiment. ”
- Other definitions, explicit and implicit, may be included below.
- a power supply circuit is provided in a first embodiment.
- Fig. 1 is a diagram of a power supply circuit in accordance with the first aspect of embodiments of the disclosure.
- Fig. 2 is a simple circuit topology of the power supply circuit in accordance with the first aspect of embodiments of the disclosure.
- Fig. 3 is a full circuit topology of the power supply circuit in accordance with the first aspect of embodiments of the disclosure.
- a power supply circuit 1 includes:
- a buck circuit 10 configured to convert input DC (direct current) voltage (received from input ports INPUT+ and INPUT-) into output DC voltage
- the buck circuit 10 includes a diode, an inductor, a capacitor and a switch Q1, the output DC voltage being outputted from output ports (VOUT+, VOUT -) ;
- a controller configured to output a controlling signal (PWM signal) according to a feedback voltage (Vout) , the feedback voltage is obtained by a voltage detection circuit 21 being connected between one output port (VOUT-) and a ground port; and
- a MOS Drive circuit 30 configured to drive the switch Q1 of the buck circuit 10 according to the controlling signal.
- the MOS Drive circuit 30 may drive the switch Q1 according to the controlling signal.
- the MOS Drive circuit 30 includes a Totem pole circuit.
- Vin DC input voltage detection.
- Vout LED output voltage detection, for example, the Vout pin may receive the feedback voltage (Vout) .
- PWM MOS Gate Driver (to the MOS Drive circuit) , for example, the controlling signal may be outputted from the PWM pin.
- BREAK PWM breaker trigger, for example, a break signal maybe received by the BREAK pin.
- Ref Current limit reference, for example, the Ref pin receives a first reference voltage.
- an off state time (Toff) for each cycle of the controlling signal is set according to an output compare (OC) reference voltage.
- an on state time (Ton) for each cycle of the controlling signal is determined by a detected peak current (Ipeak) that flows through the switch Q1.
- the power supply circuit 1 further includes:
- a current peak limiter 40 configured to detect the peak current, and send the break signal to a break pin (i.e., the BREAK pin in FIG. 3) of the controller 20, the break signal makes the control signal to fall into a low level, so as to end an on state of the switch Q1.
- the current peak limiter 40 includes a first comparator (COMP_break) 41, which compares a voltage corresponding to the peak current and the first reference voltage (denoted as Ref, which is also received by the Ref pin of the controller 20) .
- the first comparator When the voltage corresponding to the peak current is higher than the first reference voltage, the break signal with low level is generated by the first comparator. Therefore, the first reference voltage defines the Ipeak upper limit.
- the voltage corresponding to the peak current can be obtained by a resistor denoted as R-shunt 1.
- Fig. 4 is a diagram of the controller MCU in accordance with the first aspect of embodiments of the disclosure.
- Fig. 5 is diagram of working principle of the controller MCU in accordance with the first aspect of embodiments of the disclosure.
- number 1 represents “Falling edge trigger” .
- Number 2 represents “Capable for external reference or internal DAC module” , which means the comparator COMP in the controller MCU shown in Fig. 4 may replace the first comparator (COMP_break) 41 in Fig. 3, so as to use MCU internal comparator, thus to use less component and save space.
- Number 3 in Fig. 5 represents “Use OC (output compare) reference to set the Toff holding time” .
- the controller MCU (also denoted as 41 in Fig. 3) includes:
- a first timer (Tim 1) , configured to define each cycle of the controlling signal by counting, when the first timer is reset, a new cycle starts;
- a second timer (Tim 2) , configured to be reset when the off state of the controlling signal starts (for example, the break signal with a low level is sent to the break pin of the controller MCU) .
- the first timer (Tim 1) is reset, so as to end the off state of the controlling signal.
- the first reference voltage may be sampled voltage.
- the first reference voltage determines the maximum value of the current flowing through the switch Q1.
- the output compare (OC) reference voltage (denoted as OC ref) is a parameter in controller 20 for controlling the off state time (Toff) , for example, the output compare (OC) reference voltage can be stored in controller 20 and updated.
- the first reference voltage and the output compare (OC) reference voltage is the same or different.
- Fig. 6 is Timing Sequence Diagram when the buck circuit works under a CCM or a BCM.
- the off state time (Toff) is determined by a fixed ⁇ Ipeak, inductance of the inductor and the feedback voltage (Vout) .
- the ⁇ Ipeak represents the difference between an Ipeak upper limit and an Ipeak lower limit.
- Ipeak upper limit and Ipeak lower limit respectively represent the maximum value and the minimum value of the current flowing through the switch Q1.
- the first comparator’s output is connected to BREAK pin, therefore output current can be controlled cycle by cycle.
- the first reference voltage can be determined by Ipeak upper limit
- Toff target can be calculated by using the ⁇ Ipeak, the inductance L and the detected Vout, according to the above mentioned formula
- the output compare (OC) reference voltage can be determined according to the calculated Toff target
- the output compare (OC) reference voltage stored in the controller MCU 20 can be undated by using the determined output compare (OC) reference voltage.
- V_Rshunt represents a voltage on the resistor R-shunt 1 in Fig. 3.
- Fig. 7 is Timing Sequence Diagram when the buck circuit works under a DCM.
- the off state time (Toff) is determined by a fixed ⁇ Ipeak, inductance L of the inductor, an fixed output current (iLED) , the input DC (direct current) voltage (denoted as Vin) and the feedback voltage (Vout) .
- the ⁇ Ipeak equals to an Ipeak upper limit.
- the fixed ⁇ Ipeak, the inductance L of the inductor and the fixed output current (iLED) are fixed value.
- the input DC (direct current) voltage (Vin) and the feedback voltage (Vout) are variables. Vout may also be low site voltage.
- Fig. 8 is diagram of control method for Toff control with fixed ⁇ Ipeak (or Ipeak) in DCM.
- control method for Toff control with fixed ⁇ Ipeak (or Ipeak) in DCM includes:
- step 1 the controlling signal with maximum on state time Ton (denoted as PWM_ton (max) ) of the switch Q1 is sent to buck circuit 10;
- a reference for peak of current (denoted as Ipeak_ref) is generated according to a current selection signal, where Ipeak_ref corresponds to the above mentioned ⁇ Ipeak or Ipeak upper limit;
- step 3 the buck circuit 10 generates an output voltage Vout according to Ipeak_ref, PWM_ton (max) and Toff (max) , where Toff (max) is a pre-set constant value, which is around 50 micro seconds and could be defined by designer;
- step 4 Vout and bus voltage are sent to an ADC converter to generate VBus_adc and Vout_adc which are digital signals;
- step 5 a CCM or DCM calculation is performed based on VBus_adc and Vout_adc, to obtain an actual off state time (Toff) of the switch Q1.
- Step 5 may include two sub-steps:
- 1 st sub-step to determine the operation mode is CCM or DCM, for example, as shown in Fig. 7, when 1/2 ⁇ Ipeak value is larger than I_LED, it is determined that the mode is DCM;
- 2 nd sub-step to calculate Toff based on VBus_adc and Vout_adc.
- a lookup table can be used to calculate Toff based on VBus_adc and Vout_adc.
- a formula (like formula (1) ) related with VBus and Vout can be used to calculate Toff.
- Other methods in existing technologies can be used to calculate Toff based on VBus_adc and Vout_adc
- a reference for Toff (denoted as Toff_ref) is generated according to the current selection signal, for example, the current selection signal determines iLED, Ipeak_ref can be obtained as iLED fixed, then Toff_ref corresponding to iLED and Ipeak_ref can be determined by using a look-up table;
- step 7 a PI (Proportional-Integral) control is performed based on a difference between Toff_ref and the actual Toff, so as to update the Toff in controlling signal, and send the updated Toff to the buck circuit 10.
- PI Proportional-Integral
- step 4 After several cycles of step 3, step 4, step 5 and step 7, output voltage Vout will become stable.
- Fig. 9 is diagram of state machine of Toff control for power supply circuit in accordance with the first aspect of embodiments of the disclosure.
- a slow Toff control when the output voltage is stable, a slow Toff control can be used; when the output voltage is not stable, a fast Toff control can be used.
- the update rate for PI control loop in fast Toff control is higher than the update rate for PI control loop in slow Toff control.
- Fast T_off control and slow T_off control may correspond to the PI control of step 7 in Fig. 8.
- Fast Toff control can be enabled at start up or when the output voltage is in unstable state.
- Slow Toff control can be enabled when the output voltage is in unstable state.
- the power supply circuit 1 has the following advantages:
- the power supply circuit 1 has the following Characteristics:
- Totem circuit is used to Drive MOSFET
- a controlling method of a power supply circuit is provided in the first aspect of embodiments.
- the same contents as those in the first aspect of embodiments are omitted.
- a driver is provided in the third aspect of embodiments.
- Fig. 10 is a diagram of the diver. As shown in Fig, 10, the driver 50 includes:
- an EMI filter 51 which filter the Electromagnetic Interference
- a boost PFC circuit 52 which convert the input AC power into DC power
- a DC-DC convertor 53 which uses a buck circuit to convert the DC voltage of the boost PFC circuit 52 into an output voltage, the output voltage is used to drive a lighting device, for example, the lighting device is LED;
- a controller 54 controls the DC-DC convertor 53;
- a control circuit 55 communicates with the controller 54.
- the control circuit 54 communicate with a peripheral device via an interface.
- the peripheral devices may be dimmers, sensors, controllers, security device, etc.
- the interface maybe DALI (Digital Addressable Lighting Interface) .
- the controller 54 corresponds to the MCU in Figs. 1, 2 and 3.
- the DC-DC convertor 53 corresponds to the buck circuit, the MOS Drive circuit and the Current peak limiter in Fig. 3.
- the driver 50 may supply direct current (DC) power to the lighting device.
- the driver 50 may be an LED driver, the lighting device may be an LED device.
- An output power, output voltage or output current of the lighting device may be changed from a minimum to maximum value according to dimming signal, e.g. 1-10V, which is received via DALI (Digital Addressable Lighting Interface) , NFC (Near Field Communication) , Bluetooth etc..
- dimming signal e.g. 1-10V
- DALI Digital Addressable Lighting Interface
- NFC Near Field Communication
- Bluetooth Bluetooth
- the DC-DC-converter supplying the lighting device will change its output parameters (current and/or voltage) depending on the dimming signal.
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Abstract
Description
Claims (15)
- A power supply circuit, comprising:a buck circuit, configured to convert input DC (direct current) voltage into output DC voltage, the buck circuit comprising a diode, an inductor, a capacitor and a switch, the output DC voltage being outputted from output ports (VOUT+, VOUT -) ;a controller (MCU) , configured to output a controlling signal (PWM signal) according to a feedback voltage (Vout) , the feedback voltage being obtained by a voltage detection circuit being connected between one output port and a ground port; anda MOS Drive circuit, configured to drive the switch of the buck circuit according to the controlling signal,an off state time (Toff) for each cycle of the controlling signal is set according to an output compare (OC) reference voltage.
- The power supply circuit according to claim 1, wherein,an on state time (Ton) for each cycle of the controlling signal is determined by a detected peak current (Ipeak) that flows through the switch.
- The power supply circuit according to claim 2, wherein,the power supply circuit further comprises:a current peak limiter, configured to detect the peak current, and send a break signal to a break pin of the controller, the break signal makes the controlling signal to fall into a low level, so as to end the on state.
- The power supply circuit according to claim 3, wherein,the current peak limiter comprises a first comparator (COMP_break) , which compares a voltage corresponding to the peak current with a first reference voltage (Ref) , when the voltage corresponding to the peak current is higher than the first reference voltage, the break signal with low level is generated by the first comparator.
- The power supply circuit according to claim 4, wherein,the controller comprises:a first timer (Tim 1) , configured to define each cycle of the controlling signal by counting, when the first timer is reset, a new cycle starts; anda second timer (Tim 2) , configured to be reset when the off state of the controlling signal starts,when a count value of the second timer reaches to a value corresponding to the output compare (OC) reference voltage, the first timer is reset, so as to end the off state of the controlling signal.
- The power supply circuit according to claim 2, wherein,when the controller controls the buck circuit to work under a CCM (continuous conduction mode) or a BCM (borderline conduction mode) , the off state time (Toff) is determined by a fixed ΔIpeak, inductance of the inductor and the feedback voltage (Vout) ,wherein, the ΔIpeak represents the difference between an Ipeak upper limit and an Ipeak lower limit.
- The power supply circuit according to claim 2, wherein,when the controller controls the buck circuit to work under a DCM (discontinuous conduction mode) , the off state time (Toff) is determined by a fixed ΔIpeak, inductance of the inductor, an fixed output current (iLED) , the input DC (direct current) voltage (Vin) and the feedback voltage (Vout) ,wherein, the ΔIpeak equals to an Ipeak upper limit.
- A driver, used for driving a lighting device, the driver comprises the power supply circuit according to any one of claims 1-7 and a control circuit, wherein,the power supply circuit providing power to the lighting device,the control circuit communicates with the power supply circuit,the control circuit communicates with a peripheral device.
- A controlling method of a power supply circuit, the power supply circuit comprising:a buck circuit, configured to convert input DC (direct current) voltage into output DC voltage, the buck circuit comprising a diode, an inductor, a capacitor and a switch, the output DC voltage being outputted from output ports (VOUT+, VOUT -) ;a controller (MCU) , configured to output a controlling signal (PWM signal) according to a feedback voltage (Vout) , the feedback voltage being obtained by a voltage detection circuit being connected between one output port and a ground port; anda MOS Drive circuit, configured to drive the switch of the buck circuit according to the controlling signal,the controlling method comprising:setting an off state time (Toff) for each cycle of the controlling signal according to output compare (OC) reference voltage.
- The controlling method of the power supply circuit according to claim 9, wherein,an on state time (Ton) for each cycle of the controlling signal is determined by a detected peak current (Ipeak) that flows through the switch.
- The controlling method of the power supply circuit according to claim 10, wherein,the power supply circuit further comprises:a current peak limiter,the method further comprises:the current peak limiter detects the peak current, and sends a break signal to a break pin of the controller,wherein, the break signal makes the control signal to fall into a low level, so as to end the on state.
- The controlling method of the power supply circuit according to claim 11, wherein,the current peak limiter comprises a first comparator (COMP_break) , which compares a voltage corresponding to the peak current with a first reference voltage, when the voltage corresponding to the peak current is higher than the first reference voltage, the break signal with low level is generated by the first comparator.
- The controlling method of the power supply circuit according to claim 12, wherein,the controller comprises:a first timer (Tim 1) , configured to define each cycle of the controlling signal by counting, when the first timer is reset, a new cycle starts; anda second timer (Tim 2) , configured to be reset when the off state of the controlling signal starts,when a count value of the second timer reaches to a value corresponding to the output compare (OC) reference voltage, the first timer is reset, so as to end the off state of the controlling signal.
- The controlling method of the power supply circuit according to claim 10, wherein,when the controller controls the buck circuit to work under a CCM (continuous conduction mode) or a BCM (borderline conduction mode) , the off state time (Toff) is determined by a fixed ΔIpeak, inductance of the inductor and the feedback voltage (Vout) ,wherein, the ΔIpeak represents the difference between an Ipeak upper limit and an Ipeak lower limit.
- The controlling method of the power supply circuit according to claim 10, wherein,when the controller controls the buck circuit to work under a DCM (discontinuous conduction mode) , the off state time (Toff) is determined by a fixed ΔIpeak, inductance of the inductor, an fixed output current (iLED) , the input DC (direct current) voltage (Vin) and the feedback voltage (Vout) ,wherein, the ΔIpeak equals to an Ipeak upper limit.
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CN202180100036.5A CN117597857A (en) | 2021-06-29 | 2021-08-10 | Power supply circuit, driver, and control method |
EP21947823.7A EP4338275A1 (en) | 2021-06-29 | 2021-08-10 | Power supply circuit, driver and controlling method |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8754613B2 (en) * | 2009-07-21 | 2014-06-17 | Ricoh Company, Ltd. | Charging device, electronic equipment including same, and control method of charging device |
US20140239930A1 (en) * | 2013-02-28 | 2014-08-28 | Shanghai Sim-Bcd Semiconductor Manufacturing Co., Ltd. | Constant-voltage and constant-current buck converter and control circuit |
US20170104411A1 (en) * | 2015-10-09 | 2017-04-13 | Infineon Technologies Ag | Electronic controller with automatic adjustment to unknown input and load voltages |
US10433378B1 (en) * | 2019-01-15 | 2019-10-01 | Infineon Technologies Ag | Power converter control using calculated average current |
-
2021
- 2021-08-10 CN CN202180100036.5A patent/CN117597857A/en active Pending
- 2021-08-10 EP EP21947823.7A patent/EP4338275A1/en active Pending
- 2021-08-10 WO PCT/CN2021/111813 patent/WO2023272885A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8754613B2 (en) * | 2009-07-21 | 2014-06-17 | Ricoh Company, Ltd. | Charging device, electronic equipment including same, and control method of charging device |
US20140239930A1 (en) * | 2013-02-28 | 2014-08-28 | Shanghai Sim-Bcd Semiconductor Manufacturing Co., Ltd. | Constant-voltage and constant-current buck converter and control circuit |
US20170104411A1 (en) * | 2015-10-09 | 2017-04-13 | Infineon Technologies Ag | Electronic controller with automatic adjustment to unknown input and load voltages |
US10433378B1 (en) * | 2019-01-15 | 2019-10-01 | Infineon Technologies Ag | Power converter control using calculated average current |
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CN117597857A (en) | 2024-02-23 |
EP4338275A1 (en) | 2024-03-20 |
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