US20180159432A1 - Power controller with turn-on time configured according to number of current limit operations - Google Patents
Power controller with turn-on time configured according to number of current limit operations Download PDFInfo
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- US20180159432A1 US20180159432A1 US15/812,318 US201715812318A US2018159432A1 US 20180159432 A1 US20180159432 A1 US 20180159432A1 US 201715812318 A US201715812318 A US 201715812318A US 2018159432 A1 US2018159432 A1 US 2018159432A1
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- current limit
- time
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- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
-
- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the present invention is related to a power controller with turn-on time being configured according to the number of current limit operations, and more particularly is related to a power controller with turn-on time being configured according to the number of current limit operations and the peak current being decided according to the turn-on time.
- FIG. 1 is a circuit diagram showing a conventional power system.
- the conventional power system PA 1 includes a power supply module PA 11 , a transformer PA 12 , a power switch PA 13 , and a load PA 14 .
- the transformer PA 12 is electrically connected to the power supply module PA 11
- the power switch PA 13 is electrically connected to the primary side winding of the transformer PA 12
- the load PA 14 is electrically connected to the secondary side winding of the transformer PA 12
- the power controller PA 2 is electrically connected to the power supply module PA 11 , the primary side winding of the transformer PA 12 , and the power switch PA 13 .
- the power controller PA 2 receives a signal from the secondary side winding of the transformer PA 12 through a voltage divider, calculates the average value after taking the positive values of the detected signal, and uses the average value, which is proportional to the output voltage, to adjust the turn-on time of the power switch so as to control the current flowing through the secondary side of the transformer.
- the aforementioned control method cannot impose a limit to the peak current, and a bigger transformer would be needed to withstand the unlimited peak current.
- the peak current is unadjustable, the circuit cannot be used in various circuit topologies and real-time circuit protection cannot be achieved.
- a power controller with turn-on time being configured according to the number of current limit operations which sets the turn-on time according to the number of current limit operations and uses the turn-on time to decide the peak current value so as to achieve the object of an adjustable peak current value.
- a power controller with turn-on time being configured according to a number of current limit operations is provided.
- the power controller with turn-on time configured according to a number of current limit operations is applied to a power system, which includes a power supply module, a voltage divider, and a power switch.
- the power supply module is utilized for providing an input voltage.
- the voltage divider is electrically connected to the power supply module for receiving the input voltage to generate a divided input voltage.
- the power switch is electrically connected to the voltage divider.
- the power controller comprises a peak current setting unit, a comparator, a turn-on time calculation module, a timer, and a switch control module.
- the peak current setting unit is electrically connected to the voltage divider and receives a current limit turn-on time value for determining a peak current value according to the divided input voltage and the current limit turn-on time value.
- the comparator is electrically connected to the peak current setting unit and the power switch for transmitting a first trigger signal once a current value of the power switch reaches the peak current value.
- the turn-on time calculation module is electrically connected to the peak current setting unit and the comparator, and is set with a calculation time period and a target number of current limit operations for calculating a count of the first trigger signals being received during the calculation time period to define a number of current limit operations.
- the turn-on time calculation module also calculates a set turn-on time value by using the current limit turn-on time value, the number of current limit operations, and the target number of current limit operations to do a recursive calculation.
- the timer is electrically connected to the turn-on time calculation module for transmitting a second trigger signal when the set turn-on time value is counted.
- the switch control module is electrically connected to the comparator, the timer, and the power switch, for transmitting a cutoff signal to the power switch to turn off the power switch when receiving one of the first trigger signal and the second trigger signal, and the switch control module turns on the power switch after a cutoff time period.
- the turn-on time calculation module transmits the set turn-on time value to the peak current setting unit to replace the current limit turn-on time value.
- the turn-on time calculation module comprises a current limit calculation unit, a subtractor, a multiplier, and an adder.
- the current limit calculation unit is set with the calculation time period and is electrically connected to the comparator for defining the count of the first trigger signals received during the calculation time period as the number of current limit operations.
- the subtractor is electrically connected to the current limit calculation unit for calculating a number difference of current limit operations between the target number of current limit operations and the number of current limit operations.
- the multiplier is electrically connected to the subtractor and is set with a multiplying value for multiplying the number difference of current limit operations and the multiplying value to generate a multiplied time value.
- the adder is electrically connected to the multiplier, for receiving the current limit turn-on time value, and adding the multiplied time value to the current limit turn-on time value to generate the set turn-on time value.
- the turn-on time calculation module further comprises a delay circuit.
- the delay circuit has an input and an output electrically connected to the adder for delaying the set turn-on time value, and the delay circuit is an unit delay circuit.
- the switch control module comprises an OR gate and a SR flip-flop.
- the OR gate is electrically connected to the comparator and the timer for transmitting an OR gate signal when receiving one of the first trigger signal and the second trigger signal.
- the SR flip-flop is electrically connected to the OR gate and the power switch for transmitting the cutoff signal when receiving the OR gate signal.
- the peak current value can be adjusted effectively such that the size of the transformer can be reduced, the withstanding voltage of the power switch can be adjusted, the Schottky diode on the secondary side of the transformer can be adjusted, the power factor (PF) can be adjusted, and thus the circuit can be applied to various circuit topologies, such as the system with high PF, the system with lower PF, single-stage architecture, or multi-stage architecture, to facilitate the use.
- FIG. 1 is a circuit diagram showing a conventional power system
- FIG. 2 is a circuit diagram showing a power system provided in accordance with a preferred embodiment of the present invention.
- FIG. 3 is a block diagram showing a power controller with turn-on time being configured according the number of the current limit operations provided in accordance with a preferred embodiment of the present invention
- FIG. 4 is a schematic diagram showing a first waveform of the peak current value provided in accordance with a preferred embodiment of the present invention.
- FIG. 5 is a schematic diagram showing a second waveform of the peak current value provided in accordance with a preferred embodiment of the present invention
- FIG. 2 is a circuit diagram showing a power system provided in accordance with a preferred embodiment of the present invention
- FIG. 3 is a block diagram showing a power controller with turn-on time being configured according the number of the current limit operations provided in accordance with a preferred embodiment of the present invention.
- the power controller 1 with turn-on time being configured according to the number of current limit operations in accordance with a preferred embodiment of the present invention is applied to a power system 2 , which includes a power supply module 21 , a voltage divider 22 , a power switch 23 , and transformer 24 , and a load 25 .
- the power supply module 21 includes an AC power source and a rectifier in general, which is well known in the art and thus is not repeated here.
- the voltage divider 22 is electrically connected to the power supply module 21 and is composed of two resistors in general.
- the power switch 23 is electrically connected to the voltage divider 22 . Concretely speaking, the power switch 23 is electrically connected to the voltage divider 22 through the primary side of the transformer 24 , and the load 25 is electrically connected to the secondary side of the transformer 24 .
- the load 25 can be the electronic device includes the diode, the capacitor, the optical photo-coupler, and the photo diode for example, but it is well known that the load 25 may include electronic components other than the aforementioned components and thus the present invention should not be restricted thereto.
- the power controller 1 with turn-on time being configured according to the number of current limit operations comprises a peak current setting unit 11 , a comparator 12 , a turn-on time calculation module 13 , a timer 14 , and a switch control module 15 .
- the peak current setting unit 11 is electrically connected to the voltage divider 22 (the peak current setting unit 11 has one end corresponding to the AS pin in FIG. 2 ) and receives a current limit turn-on time value.
- the current limit turn-on time value can be a current limit duty ratio, such as 40% to indicate 40% of the switching time, but the present invention is not restricted thereto.
- the comparator 12 is electrically connected to the peak current setting unit 11 and the power switch 23 .
- the comparator 12 has one end corresponding to the CS pin in FIG. 2 .
- the turn-on time calculation module 13 is electrically connected to the peak current setting unit 11 and the comparator 12 , and is set with a calculation time period and a target number of current limit operations. Basically, the calculation time period and the target number of current limit operations can be manually set.
- the turn-on time calculation module 13 comprises a current limit calculation unit 131 , a subtractor 132 , a multiplier 133 , an adder 134 , and a delay circuit 135 .
- the current limit calculation unit 131 is set with the aforementioned calculation time period and is electrically connected to the comparator 12 .
- the subtractor 132 is electrically connected to the current limit calculation unit 131 .
- the multiplier 133 is electrically connected to the subtractor 132 and is set with a multiplying value (defined as k for example, the multiplying value is utilized for adjusting the speed to trace the turn-on time).
- the adder 134 is electrically connected to the multiplier 133 .
- the delay circuit 135 has an input 1351 and an output 1352 electrically connected to the adder 134 and can be an Unit Delay circuit.
- the timer 14 is electrically connected to the output 1352 of the delay circuit 135 of the turn-on time calculation module 13 .
- the switch control module 15 is electrically connected to the comparator 12 , the timer 114 , and the power switch 23 .
- the switch control module 15 comprises an OR gate 151 and a SR flip-flop 152 .
- the OR gate 151 is electrically connected to the comparator 12 and the timer 14 .
- the SR flip-flop 152 is electrically connected to the OR gate 151 and the power switch 23 , that is, the Q output of the SR flip-flop 152 is corresponding to the DRV pin shown in FIG. 2 .
- the power controller 1 with turn-on time being configured according to the number of current limit operations further comprises a zero-current comparator (which is located at the upper left corner, but is not labelled in the figure).
- the zero-current comparator has one end corresponding to the ZCD pin shown in FIG. 2 and another end electrically connected to a voltage source.
- FIG. 4 is a schematic diagram showing a first waveform of the peak current value provided in accordance with a preferred embodiment of the present invention
- FIG. 5 is a schematic diagram showing a second waveform of the peak current value provided in accordance with a preferred embodiment of the present invention.
- the power supply module 21 is utilized for providing an input voltage
- the voltage divider 22 is utilized for receiving the input voltage to generate a divided input voltage
- the peak current setting unit 11 is utilized for determining a peak current value according to the divided input voltage and the current limit turn-on time value.
- the relationship among the divided input voltage, the current limit turn-on time value, and the peak current value can be simulated in advance and stored in the peak current setting unit 11 .
- the peak current setting unit 11 may decide the peak current value by using the lookup table or by the way of calculation.
- the present invention should not be restricted thereto.
- the peak current value can be a threshold value.
- I peak (V in /L p ) ⁇ T on
- I peak is the peak current value
- V in is the divided input voltage
- L p is the inductance of the primary side inductor of the transformer 24 (which is a constant value in general)
- T on is the current limit turn-on time.
- the comparator 12 is utilized for transmitting a first trigger signal S 1 once a current value of the power switch 23 , which in general is also the current value of the inductor, reaches the peak current value I peak .
- the turn-on time calculation module 13 is utilized for calculating a count of the first trigger signals S 1 being received during the calculation time period (e.g. represented as T) to define a number of current limit operations, and also calculating a set turn-on time value by using the current limit turn-on time value, the number of current limit operations, and the target number of current limit operations to do a recursive calculation.
- the current limit calculation unit 131 of the turn-on time calculation module 13 receives the first trigger signal S 1 three times and defines the number of current limit operations (e.g. represented as N 1 ) as three, the subtractor 132 calculates a number difference of current limit operations (e.g. represented as N 2 ) between the target number of current limit operations and the number of current limit operations. For example, if the target number of current limit operations is 15, the number difference of current limit operations would be 12, i.e. 15 minus 3.
- the multiplier 133 is utilized for multiplying the number difference of current limit operations and the multiplying value to generate a multiplied time value.
- the adder 134 is utilized for receiving the current limit turn-on time value (e.g. represented as T(n)), and adding the multiplied time value to the current limit turn-on time value to generate the set turn-on time value (e.g. represented as T(n+1)).
- the delay circuit 135 is utilized for delaying the set turn-on time value, and transmitting the set turn-on time value to the adder 134 .
- the turn-on time calculation module 13 transmits the set turn-on time value to the peak current setting unit 11 to replace the current limit turn-on time value so as to achieve the object of real-time turn-on time tracing and adjustment of peak current value. That is, after using the set turn-on time value to replace the current limit turn-on time value, the peak current setting unit 11 may decide a new peak current value by using the set turn-on time value and the divided input voltage such that the peak current value would be adjusted repeatedly, and the turn-on time calculation module 13 may use the new peak current value and the calculation time period to define a new number of current limit operations and use the new number to calculate a new set turn-on time value.
- the timer 14 transmits a second trigger signal S 2 when the set turn-on time value is counted.
- the OR gate 151 of the switch control module 15 transmits a cutoff signal S 3 to the power switch 23 to turn off the power switch 23 when receiving one of the first trigger signal Si and the second trigger signal S 2 , and turns on the power switch 23 after a cutoff time period.
- the cutoff time period may be decided by the zero-current comparator, i.e. the power switch 23 would be turned on when the inductor current is detected to be 0.
- the present invention should not be restricted thereto.
- each complete waveform has two triangle waves which do not reach the peak current value, the two triangle waves may be corresponding to the condition that the timer 14 transmits the second trigger signal S 2 to turn off the power switch 23 .
- the present invention should not be restricted thereto.
- the peak current value would be declined such that the count that the current value reaches the peak current value would be increased to have the number of current limit operations reaching the target number of current limit operations.
- the greater the peak current value the smaller the number of the current limit operations, and thus a smaller target number of current limit operations can be set; the smaller the peak current value, the greater the number of current limit operations, and thus a greater target number of current limit operations can be set; and the higher the divided input voltage, the lower the peak current value.
- the peak current value can be adjusted effectively such that the size of the transformer can be reduced, the withstanding voltage of the power switch can be adjusted, the Schottky diode on the secondary side of the transformer can be adjusted, the power factor (PF) can be adjusted, and thus can be applied to various circuit topologies, such as the system with high PF, the system with lower PF, single-stage architecture, or multi-stage architecture, to facilitate the use.
- PF power factor
Abstract
Description
- The present invention is related to a power controller with turn-on time being configured according to the number of current limit operations, and more particularly is related to a power controller with turn-on time being configured according to the number of current limit operations and the peak current being decided according to the turn-on time.
- Attending with the progress of technology, the rapid development of electronic devices has broadly improved the quality of life. Because of the massive growth of electronic devices, the demand of power controller increases. For example, the light-emitting diode (LED) lighting systems or the transformers need to use the power controller.
- In terms of control methods, primary side regulation and quasi resonant control are the two control methods broadly used in the conventional power controllers.
FIG. 1 is a circuit diagram showing a conventional power system. - As show in
FIG. 1 , in general, the conventional power system PA1 includes a power supply module PA11, a transformer PA12, a power switch PA13, and a load PA14. The transformer PA12 is electrically connected to the power supply module PA11, the power switch PA13 is electrically connected to the primary side winding of the transformer PA12, the load PA14 is electrically connected to the secondary side winding of the transformer PA12, and the power controller PA2 is electrically connected to the power supply module PA11, the primary side winding of the transformer PA12, and the power switch PA13. - Take the control method of primary side regulation as an example, the power controller PA2 receives a signal from the secondary side winding of the transformer PA12 through a voltage divider, calculates the average value after taking the positive values of the detected signal, and uses the average value, which is proportional to the output voltage, to adjust the turn-on time of the power switch so as to control the current flowing through the secondary side of the transformer.
- However, the aforementioned control method cannot impose a limit to the peak current, and a bigger transformer would be needed to withstand the unlimited peak current. In addition, because the peak current is unadjustable, the circuit cannot be used in various circuit topologies and real-time circuit protection cannot be achieved.
- In view of the conventional technology mentioned above, it is common to have the problems of large layout area, unadoptable to various circuit topologies, and lack of real-time circuit protection. Accordingly, a power controller with turn-on time being configured according to the number of current limit operations is provided in accordance with the present invention, which sets the turn-on time according to the number of current limit operations and uses the turn-on time to decide the peak current value so as to achieve the object of an adjustable peak current value.
- In accordance with the aforementioned object, a power controller with turn-on time being configured according to a number of current limit operations is provided. The power controller with turn-on time configured according to a number of current limit operations is applied to a power system, which includes a power supply module, a voltage divider, and a power switch. The power supply module is utilized for providing an input voltage. The voltage divider is electrically connected to the power supply module for receiving the input voltage to generate a divided input voltage. The power switch is electrically connected to the voltage divider. The power controller comprises a peak current setting unit, a comparator, a turn-on time calculation module, a timer, and a switch control module. The peak current setting unit is electrically connected to the voltage divider and receives a current limit turn-on time value for determining a peak current value according to the divided input voltage and the current limit turn-on time value. The comparator is electrically connected to the peak current setting unit and the power switch for transmitting a first trigger signal once a current value of the power switch reaches the peak current value.
- The turn-on time calculation module is electrically connected to the peak current setting unit and the comparator, and is set with a calculation time period and a target number of current limit operations for calculating a count of the first trigger signals being received during the calculation time period to define a number of current limit operations. The turn-on time calculation module also calculates a set turn-on time value by using the current limit turn-on time value, the number of current limit operations, and the target number of current limit operations to do a recursive calculation. The timer is electrically connected to the turn-on time calculation module for transmitting a second trigger signal when the set turn-on time value is counted. The switch control module is electrically connected to the comparator, the timer, and the power switch, for transmitting a cutoff signal to the power switch to turn off the power switch when receiving one of the first trigger signal and the second trigger signal, and the switch control module turns on the power switch after a cutoff time period. Wherein the turn-on time calculation module transmits the set turn-on time value to the peak current setting unit to replace the current limit turn-on time value.
- In accordance to an embodiment of the aforementioned power controller with turn-on time being configured according to the number of current limit operations, the turn-on time calculation module comprises a current limit calculation unit, a subtractor, a multiplier, and an adder. The current limit calculation unit is set with the calculation time period and is electrically connected to the comparator for defining the count of the first trigger signals received during the calculation time period as the number of current limit operations. The subtractor is electrically connected to the current limit calculation unit for calculating a number difference of current limit operations between the target number of current limit operations and the number of current limit operations. The multiplier is electrically connected to the subtractor and is set with a multiplying value for multiplying the number difference of current limit operations and the multiplying value to generate a multiplied time value. The adder is electrically connected to the multiplier, for receiving the current limit turn-on time value, and adding the multiplied time value to the current limit turn-on time value to generate the set turn-on time value.
- In accordance with an embodiment of the aforementioned power controller with turn-on time configured according to a number of current limit operations, the turn-on time calculation module further comprises a delay circuit. The delay circuit has an input and an output electrically connected to the adder for delaying the set turn-on time value, and the delay circuit is an unit delay circuit.
- In accordance with an embodiment of the aforementioned power controller with turn-on time configured according to a number of current limit operations, the switch control module comprises an OR gate and a SR flip-flop. The OR gate is electrically connected to the comparator and the timer for transmitting an OR gate signal when receiving one of the first trigger signal and the second trigger signal. The SR flip-flop is electrically connected to the OR gate and the power switch for transmitting the cutoff signal when receiving the OR gate signal.
- By using the power controller with turn-on time being configured according to the number of current limit operations provided in the present invention, because the turn-on time is set according to the number of the current limit operations and the peak current value is decided according to the turn-on time, the peak current value can be adjusted effectively such that the size of the transformer can be reduced, the withstanding voltage of the power switch can be adjusted, the Schottky diode on the secondary side of the transformer can be adjusted, the power factor (PF) can be adjusted, and thus the circuit can be applied to various circuit topologies, such as the system with high PF, the system with lower PF, single-stage architecture, or multi-stage architecture, to facilitate the use.
- The present invention will now be specified with reference to its preferred embodiment illustrated in the drawings, in which:
-
FIG. 1 is a circuit diagram showing a conventional power system; -
FIG. 2 is a circuit diagram showing a power system provided in accordance with a preferred embodiment of the present invention; -
FIG. 3 is a block diagram showing a power controller with turn-on time being configured according the number of the current limit operations provided in accordance with a preferred embodiment of the present invention; -
FIG. 4 is a schematic diagram showing a first waveform of the peak current value provided in accordance with a preferred embodiment of the present invention; and -
FIG. 5 is a schematic diagram showing a second waveform of the peak current value provided in accordance with a preferred embodiment of the present invention - There are various embodiments of the power controller with turn-on time being configured according the number of current limit operations in accordance with the present invention, which are not repeated hereby. Only one preferred embodiment is mentioned in the following paragraph as an example.
- Please refer to
FIG. 2 andFIG. 3 , whereinFIG. 2 is a circuit diagram showing a power system provided in accordance with a preferred embodiment of the present invention andFIG. 3 is a block diagram showing a power controller with turn-on time being configured according the number of the current limit operations provided in accordance with a preferred embodiment of the present invention. - As shown, the
power controller 1 with turn-on time being configured according to the number of current limit operations in accordance with a preferred embodiment of the present invention is applied to apower system 2, which includes apower supply module 21, avoltage divider 22, apower switch 23, andtransformer 24, and aload 25. - The
power supply module 21 includes an AC power source and a rectifier in general, which is well known in the art and thus is not repeated here. Thevoltage divider 22 is electrically connected to thepower supply module 21 and is composed of two resistors in general. Thepower switch 23 is electrically connected to thevoltage divider 22. Concretely speaking, thepower switch 23 is electrically connected to thevoltage divider 22 through the primary side of thetransformer 24, and theload 25 is electrically connected to the secondary side of thetransformer 24. Theload 25 can be the electronic device includes the diode, the capacitor, the optical photo-coupler, and the photo diode for example, but it is well known that theload 25 may include electronic components other than the aforementioned components and thus the present invention should not be restricted thereto. - The
power controller 1 with turn-on time being configured according to the number of current limit operations comprises a peakcurrent setting unit 11, acomparator 12, a turn-ontime calculation module 13, atimer 14, and aswitch control module 15. - The peak
current setting unit 11 is electrically connected to the voltage divider 22 (the peakcurrent setting unit 11 has one end corresponding to the AS pin inFIG. 2 ) and receives a current limit turn-on time value. The current limit turn-on time value can be a current limit duty ratio, such as 40% to indicate 40% of the switching time, but the present invention is not restricted thereto. - The
comparator 12 is electrically connected to the peakcurrent setting unit 11 and thepower switch 23. Thecomparator 12 has one end corresponding to the CS pin inFIG. 2 . The turn-ontime calculation module 13 is electrically connected to the peakcurrent setting unit 11 and thecomparator 12, and is set with a calculation time period and a target number of current limit operations. Basically, the calculation time period and the target number of current limit operations can be manually set. - Concretely speaking, the turn-on
time calculation module 13 comprises a currentlimit calculation unit 131, asubtractor 132, amultiplier 133, anadder 134, and adelay circuit 135. The currentlimit calculation unit 131 is set with the aforementioned calculation time period and is electrically connected to thecomparator 12. Thesubtractor 132 is electrically connected to the currentlimit calculation unit 131. Themultiplier 133 is electrically connected to thesubtractor 132 and is set with a multiplying value (defined as k for example, the multiplying value is utilized for adjusting the speed to trace the turn-on time). Theadder 134 is electrically connected to themultiplier 133. Thedelay circuit 135 has aninput 1351 and anoutput 1352 electrically connected to theadder 134 and can be an Unit Delay circuit. - The
timer 14 is electrically connected to theoutput 1352 of thedelay circuit 135 of the turn-ontime calculation module 13. Theswitch control module 15 is electrically connected to thecomparator 12, the timer 114, and thepower switch 23. Concretely speaking, theswitch control module 15 comprises anOR gate 151 and a SR flip-flop 152. The ORgate 151 is electrically connected to thecomparator 12 and thetimer 14. The SR flip-flop 152 is electrically connected to theOR gate 151 and thepower switch 23, that is, the Q output of the SR flip-flop 152 is corresponding to the DRV pin shown inFIG. 2 . - In addition, in accordance with the preferred embodiment of the present invention, the
power controller 1 with turn-on time being configured according to the number of current limit operations further comprises a zero-current comparator (which is located at the upper left corner, but is not labelled in the figure). The zero-current comparator has one end corresponding to the ZCD pin shown inFIG. 2 and another end electrically connected to a voltage source. - Please refer to
FIG. 2 toFIG. 5 , whereinFIG. 4 is a schematic diagram showing a first waveform of the peak current value provided in accordance with a preferred embodiment of the present invention, andFIG. 5 is a schematic diagram showing a second waveform of the peak current value provided in accordance with a preferred embodiment of the present invention. As shown, thepower supply module 21 is utilized for providing an input voltage, thevoltage divider 22 is utilized for receiving the input voltage to generate a divided input voltage, and the peakcurrent setting unit 11 is utilized for determining a peak current value according to the divided input voltage and the current limit turn-on time value. For example, the relationship among the divided input voltage, the current limit turn-on time value, and the peak current value can be simulated in advance and stored in the peakcurrent setting unit 11. The peakcurrent setting unit 11 may decide the peak current value by using the lookup table or by the way of calculation. However, the present invention should not be restricted thereto. In addition, as a preferred embodiment, the peak current value can be a threshold value. - For example, if the peak current value is decided by the way of calculation, the equation Ipeak=(Vin/Lp)×Ton can be used to access the peak current value, where Ipeak is the peak current value, Vin is the divided input voltage, Lp is the inductance of the primary side inductor of the transformer 24 (which is a constant value in general), Ton is the current limit turn-on time.
- The
comparator 12 is utilized for transmitting a first trigger signal S1 once a current value of thepower switch 23, which in general is also the current value of the inductor, reaches the peak current value Ipeak. The turn-ontime calculation module 13 is utilized for calculating a count of the first trigger signals S1 being received during the calculation time period (e.g. represented as T) to define a number of current limit operations, and also calculating a set turn-on time value by using the current limit turn-on time value, the number of current limit operations, and the target number of current limit operations to do a recursive calculation. - For example, as shown in
FIG. 4 , three complete waveforms (such as the waveforms of the primary side current of the transformer 24) are found in the calculation time period, the currentlimit calculation unit 131 of the turn-ontime calculation module 13 receives the first trigger signal S1 three times and defines the number of current limit operations (e.g. represented as N1) as three, thesubtractor 132 calculates a number difference of current limit operations (e.g. represented as N2) between the target number of current limit operations and the number of current limit operations. For example, if the target number of current limit operations is 15, the number difference of current limit operations would be 12, i.e. 15 minus 3. - The
multiplier 133 is utilized for multiplying the number difference of current limit operations and the multiplying value to generate a multiplied time value. Theadder 134 is utilized for receiving the current limit turn-on time value (e.g. represented as T(n)), and adding the multiplied time value to the current limit turn-on time value to generate the set turn-on time value (e.g. represented as T(n+1)). Thedelay circuit 135 is utilized for delaying the set turn-on time value, and transmitting the set turn-on time value to theadder 134. That is, the recursive calculation mentioned in the present preferred embodiment is T(n+1)=T(n)+k(N2−N1), the calculation repeats until T(n+1)=T(n), such that the final number of current limit operations would be changed to the target number of current limit operations, i.e. 15 times as shown inFIG. 5 . - In addition, the turn-on
time calculation module 13 transmits the set turn-on time value to the peakcurrent setting unit 11 to replace the current limit turn-on time value so as to achieve the object of real-time turn-on time tracing and adjustment of peak current value. That is, after using the set turn-on time value to replace the current limit turn-on time value, the peakcurrent setting unit 11 may decide a new peak current value by using the set turn-on time value and the divided input voltage such that the peak current value would be adjusted repeatedly, and the turn-ontime calculation module 13 may use the new peak current value and the calculation time period to define a new number of current limit operations and use the new number to calculate a new set turn-on time value. - The
timer 14 transmits a second trigger signal S2 when the set turn-on time value is counted. The ORgate 151 of theswitch control module 15 transmits a cutoff signal S3 to thepower switch 23 to turn off thepower switch 23 when receiving one of the first trigger signal Si and the second trigger signal S2, and turns on thepower switch 23 after a cutoff time period. - The cutoff time period may be decided by the zero-current comparator, i.e. the
power switch 23 would be turned on when the inductor current is detected to be 0. However, it is understood that there are various embodiments can be used to achieve the object to switch thepower switch 23 repeatedly for calculating the number of current limit operations, and thus the present invention should not be restricted thereto. In addition, as shown inFIG. 5 , each complete waveform has two triangle waves which do not reach the peak current value, the two triangle waves may be corresponding to the condition that thetimer 14 transmits the second trigger signal S2 to turn off thepower switch 23. However, the present invention should not be restricted thereto. - Moreover, after the set turn-on time value is calculated, the peak current value would be declined such that the count that the current value reaches the peak current value would be increased to have the number of current limit operations reaching the target number of current limit operations. Thus, the greater the peak current value, the smaller the number of the current limit operations, and thus a smaller target number of current limit operations can be set; the smaller the peak current value, the greater the number of current limit operations, and thus a greater target number of current limit operations can be set; and the higher the divided input voltage, the lower the peak current value.
- In conclusion, by using the power controller with turn-on time being configured according to the number of current limit operations provided in the present invention, because the turn-on time is set according to the number of the current limit operations and the peak current value is decided according to the turn-on time, the peak current value can be adjusted effectively such that the size of the transformer can be reduced, the withstanding voltage of the power switch can be adjusted, the Schottky diode on the secondary side of the transformer can be adjusted, the power factor (PF) can be adjusted, and thus can be applied to various circuit topologies, such as the system with high PF, the system with lower PF, single-stage architecture, or multi-stage architecture, to facilitate the use.
- While the present invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be without departing from the spirit and scope of the present invention.
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