CN108964464A - The circuit and its method of Switching Power Supply outlet side non-destructive testing load current - Google Patents
The circuit and its method of Switching Power Supply outlet side non-destructive testing load current Download PDFInfo
- Publication number
- CN108964464A CN108964464A CN201710360913.8A CN201710360913A CN108964464A CN 108964464 A CN108964464 A CN 108964464A CN 201710360913 A CN201710360913 A CN 201710360913A CN 108964464 A CN108964464 A CN 108964464A
- Authority
- CN
- China
- Prior art keywords
- output
- circuit
- signal
- module
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- H02M3/22—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
- H02M3/33561—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 having more than one ouput with independent control
-
- 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
- H02M3/33569—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 having several active switching elements
- H02M3/33576—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal 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 in a bridge configuration
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present patent application discloses the circuit and its method of outlet side non-destructive testing load current in a kind of switched-mode power supply.The circuit includes output rectifier part, output capacitance and output load current detection chip, it is characterized by: the output loading detection chip includes output side winding turn-on time detection module, time width and the period of energy are provided for detecting to load to output end；Duty cycle conversion module, the output winding turn-on time signal that will test out are averaged.With it is traditional by the method for the resistance detection load current being connected in series in output loop compared with, it is extremely low to implement circuit loss of the invention, not only increases efficiency, and due to eliminating detection resistance, reduce peripheral component, reduce costs.
Description
Technical field
The present invention relates to Switching Power Supply load detecting technologies, and particularly, it is negative that the present invention relates to a kind of outlet side non-destructive testings
Carry current circuit.
Background technique
Increase a sampling resistor currently, generally requiring in Switching Power Supply in output end detection load current, passes through detection
Voltage on sampling resistor perceives the variation of load.
It is the system schematic of traditional outlet side detection load current shown in Fig. 1.The electricity of negative voltage one end of resistance 122
Flat to represent the current value of present load, one end of resistance 114 is connected with one end of resistance 122, outlet side chip 110
The detection voltage of the pin of VCTRL is the superposition of output voltage Vo and the output load current voltage on resistance 122, with load
The increase of electric current, the voltage of resistance 122 become increasingly to bear, and the voltage in order to guarantee VCTRL pin is constant, whole system loop
Adjust the result is that output voltage increases with the increase of load current.
The pin of the ICTRL of pio chip 110 shown in Fig. 1 is connected to the negative voltage side of resistance 122.When output electric current increases
To setting electric current when, current loop, which works, to be limited system output current and continues growing to guarantee the output of constant current.
But the system of traditional outlet side detection load current has following defect,
1, due to needing detection to flow through the electric current of resistance 122, so there is loss on resistance, cause power-efficient low；
2, the general resistance for all selecting milliohm rank of resistance 122, so pressure drop is also very low on resistance, detection accuracy is inadequate
It is high；
3, component used in the circuit is more, the higher cost of power supply, and reliability is low.
Therefore, it is necessary to a kind of detection circuit, it can apply and be not lost in outlet side while detection accuracy is high, component is few
To reduce the production cost of power supply, reliability is improved.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, it is lossless to provide a kind of outlet side
Detect the method and circuit of load current.The technical proposal for solving the technical problem of the invention is: being managed by chip one
Foot (DET) detects the signal of outlet side rectifying device one end, extracts the time that outlet side rectifying device has electric current to flow through, passes through
The information that signal processing extracts load current is carried out to the time.The circuit of the outlet side non-destructive testing load current includes rectification
Device, output capacitance and controller.Wherein, the controller chip includes:
Turn-on time detection module provides time width and the period of energy for detecting to load to output end；
Duty cycle conversion module, the signal that will test out are averaged.
In controller of the present invention, the controller chip further comprises:
Fixed pulse generation circuit, turn-on time detection module export square wave, it is constant which are processed into pulse width
Signal, which is inputed to duty detection circuit, to obtain one by the characterization switching frequency of current system
A DC voltage relevant to load or current signal.
In controller of the present invention, the controller chip further comprises:
Comparison module, the loading condition for detecting according to judge current charged state；
Drive module, for the judging result of current charged state to be output to output end；
Display module, for showing charged state according to the output signal of the drive module.
In controller of the present invention, the controller chip further comprises:
Amplifier module, the loading condition for detecting according to change system output voltage；
Drive module, for according to the electric current of loading condition and output voltage control optocoupler detected, to change and be
The switching frequency (PFM) or pulse width (PWM) of system.
In controller of the present invention, the turn-on time detection module includes:
Integrating circuit, by being integrated to the signal that DET is detected；
Comparator 1, DET signal and VREF1 are compared, thus at the time of detecting the conducting of outlet side rectifier current；
Comparator 2, DET signal and VREF2 are compared, thus at the time of detecting that outlet side rectifier current terminates；
Comparator 3, integrated value and VREF3 are compared, to determine whether that processing outlet side rectifier current is led
Logical signal；
Impulse generator 1, the signal exported to comparator 1 is handled, to generate outlet side electric current start time
Pulse；
Impulse generator 2, the signal exported to comparator 2 is handled, to generate outlet side electric current finish time
Pulse.
In controller of the present invention, the duty cycle conversion module includes:
Low-pass filter circuit, for impulse wave to be converted into direct current signal.
In controller of the present invention, the duty cycle conversion module further comprises:
Summing circuit, for calculating the temporal summation that pulse signal is high level；
D/A conversion circuit, for converting digital signals into analog signal.
In controller of the present invention, the amplifier module includes:
Adder, for the signal and reference voltage that characterize loading condition to be summed, load current increases, amplifier EA
The voltage at the end VN also increase, to increase output voltage according to load current, reach the mesh of the compensation output cord loss of voltage
's；
EA module, for the signal of output sampling to be compared and amplify with the voltage at the end VN；
PFM module generates a pulse signal according to the output signal of EA module, which opens
The logical moment.
The circuit for implementing outlet side non-destructive testing load current of the invention, can be improved Switching Power Supply transfer efficiency, and
And circuit is simple and reliable, component is few.
Detailed description of the invention
Fig. 1 is the schematic diagram of existing detection outlet side load current；
Fig. 2 is the systematic schematic diagram of one embodiment based on outlet side non-destructive testing load current of the invention.
Fig. 3 is the systematic schematic diagram of another embodiment based on outlet side non-destructive testing load current of the invention.
Fig. 4 is the circuit theory of another embodiment based on outlet side non-destructive testing load current principle of the invention
Figure.
Fig. 5 is to turn lamp application principle figure based on of the invention one.
Fig. 6 is the application principle figure based on a compensation output cord loss of voltage of the invention.
Fig. 7 is system switching frequency, input stage switch peak point current D/C voltage value corresponding with the load current detected
With the change curve of load current.
Fig. 8 is based on specific implementation block diagram of the invention.
Fig. 9 is based on another specific implementation block diagram of the invention.
Figure 10 is the voltage node figure inside controller
Figure 11 is the inside schematic diagram for turning lamp application drawing 5.
Figure 12 is the inside schematic diagram of output cord voltage compensation application drawing 6.
Figure 13 is to turn the signal graph that the end R and the end G change with load in lamp application.
Figure 14 is to turn the specific implementation block diagram that lamp application is reduction stand-by power consumption
Figure 15 is to turn the waveform diagram that lamp application is reduction stand-by power consumption.
Specific embodiment
Specific embodiments of the present invention described in detail below.The example of embodiment provides in the accompanying drawings.It should be noted that here
The example of description is used only to for example, being not intended to restrict the invention.For the ease of understanding thoroughly the present invention, reality is elaborated
The details applied.However, for persons skilled in the art it is readily apparent that this need not also can be implemented using these details
Invention.In describing the embodiments of the present, in order to avoid obscuring the present invention, circuit well-known in the art is not described specifically.
Throughout the specification, to " one embodiment ", " embodiment " refer to it is meant that in conjunction with the embodiment describe
Special characteristic, structure or characteristic are comprised at least one embodiment of the invention.Therefore, the whole instruction eachly
The phrase " in one embodiment " that just occurs is not necessarily all referring to the same embodiment " in embodiment ".
Fig. 2 is the system schematic detected based on lossless output load current of the invention.With it is shown in FIG. 1 traditional
Load current is detected the difference is that without sampling resistor.Resistance 126 is desirably integrated into chip interior.Controller 200
The signal waveform of DET pin reflects the Current Voltage situation of change of inside transformer.The power pin VCC of controller 200 is straight
It is connected to the output of system in succession, the output of system can also be connected to by resistance.Turn-on time detection module passes through to DET's
Signal processing detects time and period that electric current is flowed through on rectifier 109, and duty cycle conversion module passes through to the arteries and veins detected
It rushes signal to be averaged, the average value of taking-up can be used for LED light and turn the applications such as lamp, cable voltage drop compensation.
Output rectifier is connect also to can detecte out in output side winding one end and output voltage one end and is supplied to load energy
The time of amount, as shown in Figure 3.The DET signal generating positive and negative voltage of signal and Fig. 2 that the DET of controller 300 is detected is exactly the opposite,
Turn-on time detection module can be just sent to by needing to carry out signal conversion inside controller.
For pulse frequency modulated (PFM) mode, also can produce by the switching frequency of sampling system with load current
The signal of variation, embodiment are as shown in Figure 4.Fixed pulse width generation circuit is for generating the fixed frequency simultaneously of pulse width
For the pulse of system operating frequency, which outputs direct current relevant with system operating frequency after duty cycle conversion module
Signal.
It is illustrated in figure 5 the systematic schematic diagram that LED light turns lamp application.Resistance 129 is desirably integrated into controller 200
It is interior.The signal of duty cycle conversion module output and the voltage of Bias pin are compared, when output load current is big, controller
The end R be low level, the end G be high-impedance state, it is bright that LED light 128 is shown as red light.When output load current is small, the end G of controller
For low level, the end R is high-impedance state, and LED light 128 is shown as green light.It can change the conversion of traffic lights by adjusting resistance 129
Load point.
The circuit embodiments of output cord voltage compensation are as shown in Figure 6.The VSENSE pin sampling output electricity of controller 200
The output signal VLOAD of pressure, the sampled voltage, reference voltage VREF and duty cycle conversion module is handled, and produces one
With the signal of load variation, so that system output voltage changes with load current.
If switching frequency with load variation as shown in fig. 7, so duty cycle conversion output signal underloading section with
Load linearity increases, and is that load current opens radical sign curve in intermediate constant frequency Duan Ze, returns in heavily loaded section and increase with load linearity.
One of implementation of turn-on time detection module is as shown in Figure 8.Integrating circuit is higher than output to DET level
The signal of voltage is integrated, when integral voltage is more than VREF3 wait outlet side rectifier current Continuity signal, hereafter when
DET signal then judges that outlet side rectifier current is connected lower than VREF1, is judged as outlet side after DET signal is higher than VREF
Rectifier current conducting terminates, subsequently into the detection of new a cycle.The conduction pulses signal of outlet side electric current passes through low pass
Direct current signal is converted into after filtering.As shown in figure 9, the conduction pulses signal of outlet side electric current can also carry out height with digital method
Level summation, is then converted into analog signal by D/A module.
One specific implementation method of the comparison circuit and driving circuit that turn lamp application is as shown in figure 11.VLOAD and reference
Voltage 4 is compared, and makes the end output pin R low level by driving circuit when the output of comparator is high level, the end G is
High-impedance state.So that output pin G is broken by driving circuit when the output of comparator is low level is low level, and the end R is high-impedance state.
In order to reduce no-load standby, in light condition by the brightness deterioration of green light, one such embodiment such as Figure 14 works as load
Electric current is less than when turning lamp current of setting, generates a fixed pulse width within the period that output side rectifier does not have electric current
Pulse, when output side rectifier do not have the time of electric current than setting fixed pulse width in short-term, green light whole process is bright, and the end G is complete
Journey is low level, when export side rectifier do not have the time of electric current it is longer than the fixed pulse width of setting when, green light is only opened solid
Determine pulse temporal width, the end G is that low level time width only has fixed pulse time width, remaining time is high-impedance state.
The specific implementation figure of amplifier and drive module in the application of output cord voltage compensating circuit is as shown in figure 12.
Output load current signal VLOAD and reference voltage VREF5 carry out summation generate VN voltage, the voltage with load current increasing
Add and increase, by feed circuit output voltage is increased with load current.The signal of amplifier output is converted by PFM
Current signal drives optocoupler, to change the switching frequency of system.
Although, exemplary embodiment describes the present invention according to above-mentioned, it should be appreciated that, term used is explanation
With illustrative, rather than restrictive term.Since the present invention can be embodied in a variety of forms without departing from the present invention
Spirit or essence, it should therefore be appreciated that above-described embodiment is not limited to any mentioned-above detail, and should weigh
Widely understand in spirit and scope defined by benefit requirement.Therefore, whole changes in claim or its equivalent scope are fallen into
Change and remodeling is all covered by claim.
Claims (10)
1. a kind of circuit of outlet side non-destructive testing load current, which is characterized in that the circuit includes:
Output rectifier (109) is connected between output winding and ground；
Output capacitance (121), is connected between output port and ground；
Controller (200), including feeder ear, signal detection end；
The wherein controller (200), including turn-on time detection module (201) provide energy for detecting to load to output end
The time width of amount and period；Duty cycle conversion module (202), the signal that will test out are averaged.
2. circuit according to claim 1, it is characterised in that the output rectifier (109) can connect in output winding
Between load.Controller (300) includes signal conversion module (301), and the signal for will test end carries out positive-negative reverse-phase, is led
Logical time detection module (301) and duty cycle conversion module (302).
3. circuit according to claim 1, which is characterized in that the controller (200) further comprises:
The square-wave signal of fixed pulse width generation circuit (203), rectifier conducting inputs the fixed pulse generation circuit, Gu
Determine pulse width generation circuit and be connected to duty detection circuit, by duty detection circuit output duty cycle measured value.
4. circuit according to claim 1, which is characterized in that the controller (200) further comprises:
Comparison module (205), the loading condition for detecting according to judge current charged state；
Drive module (204), for the judging result of present charge state to be output to output end；
Display module (128), for showing charged state according to the output signal of the drive module.
5. circuit according to claim 1, which is characterized in that the controller (200) further comprises:
Amplifier module (207), the loading condition for detecting according to change system output voltage；
Drive module (206), for the electric current according to loading condition and output voltage values the control optocoupler detected.
6. controller according to claim 1, which is characterized in that the turn-on time detection module includes:
Integrating circuit is integrated for the signal to test side；
Comparator 1, at the time of for detecting the conducting of outlet side rectifier current；
Comparator 2, at the time of for detecting the shutdown of outlet side rectifier current；
Comparator 3, for determining whether the signal of processing outlet side rectifier current conducting；
Impulse generator 1, for generating the pulse of outlet side current lead-through start time；
Impulse generator 2, for generating the pulse of outlet side electric current finish time.
7. controller according to claim 1, which is characterized in that the duty cycle conversion module includes:
Low-pass filter circuit, for impulse wave to be converted into direct current signal.
8. controller according to claim 1, which is characterized in that the duty cycle conversion module includes:
Summing circuit, for calculating the temporal summation that pulse signal is high level；
D/A conversion circuit, for converting digital signals into analog signal.
9. circuit according to claim 4, which is characterized in that the amplifier module (207) includes:
Adder, for the signal and reference voltage that characterize loading condition to be summed, load current increases the VN of amplifier EA
The voltage at end also increases, to increase output voltage according to load current；
EA module, for the signal of output sampling to be compared and amplify with the voltage at the end VN；
PFM module generates a pulse signal, when opening of the signal deciding input terminal power tube according to the output signal of EA module
It carves.
10. according to circuit described in right 4, which is characterized in that the driving circuit includes:
Fixed pulse generation circuit, for being the low level time reducing the end G at light load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710360913.8A CN108964464B (en) | 2017-05-19 | 2017-05-19 | Circuit and method for nondestructive testing of load current at output side of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710360913.8A CN108964464B (en) | 2017-05-19 | 2017-05-19 | Circuit and method for nondestructive testing of load current at output side of switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108964464A true CN108964464A (en) | 2018-12-07 |
| CN108964464B CN108964464B (en) | 2022-11-29 |
Family
ID=64462265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710360913.8A Active CN108964464B (en) | 2017-05-19 | 2017-05-19 | Circuit and method for nondestructive testing of load current at output side of switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108964464B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252970A (en) * | 2021-04-23 | 2021-08-13 | 长城电源技术有限公司 | Load detection circuit and power supply system |
| CN116131628A (en) * | 2023-04-17 | 2023-05-16 | 深圳市力生美半导体股份有限公司 | Switching power supply and lamp turning control system and chip thereof |
| CN117977531A (en) * | 2024-03-29 | 2024-05-03 | 杭州径上科技有限公司 | Self-adaptive power supply device, system and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1815838A (en) * | 2005-02-03 | 2006-08-09 | 昂宝电子（上海）有限公司 | Multi-threshold over-curreut protection system and method for switch powersupply converter |
| CN102364858A (en) * | 2011-02-01 | 2012-02-29 | 杭州士兰微电子股份有限公司 | Constant-current switching power supply controller capable of controlling through primary side and method |
| CN102487246A (en) * | 2010-12-01 | 2012-06-06 | 比亚迪股份有限公司 | Switching power supply, control method of switching power supply and PWM (pulse width modulation) control chip |
| CN102810984A (en) * | 2012-07-13 | 2012-12-05 | 电子科技大学 | Switching power circuit |
| CN106208714A (en) * | 2016-08-08 | 2016-12-07 | 杭州士兰微电子股份有限公司 | Synchronous rectifying switching power source and control method |
| US20160359421A1 (en) * | 2014-12-07 | 2016-12-08 | Alpha And Omega Semiconductor (Cayman) Ltd. | Power supply device |
-
2017
- 2017-05-19 CN CN201710360913.8A patent/CN108964464B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1815838A (en) * | 2005-02-03 | 2006-08-09 | 昂宝电子（上海）有限公司 | Multi-threshold over-curreut protection system and method for switch powersupply converter |
| CN102487246A (en) * | 2010-12-01 | 2012-06-06 | 比亚迪股份有限公司 | Switching power supply, control method of switching power supply and PWM (pulse width modulation) control chip |
| CN102364858A (en) * | 2011-02-01 | 2012-02-29 | 杭州士兰微电子股份有限公司 | Constant-current switching power supply controller capable of controlling through primary side and method |
| CN102810984A (en) * | 2012-07-13 | 2012-12-05 | 电子科技大学 | Switching power circuit |
| US20160359421A1 (en) * | 2014-12-07 | 2016-12-08 | Alpha And Omega Semiconductor (Cayman) Ltd. | Power supply device |
| CN106208714A (en) * | 2016-08-08 | 2016-12-07 | 杭州士兰微电子股份有限公司 | Synchronous rectifying switching power source and control method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252970A (en) * | 2021-04-23 | 2021-08-13 | 长城电源技术有限公司 | Load detection circuit and power supply system |
| CN116131628A (en) * | 2023-04-17 | 2023-05-16 | 深圳市力生美半导体股份有限公司 | Switching power supply and lamp turning control system and chip thereof |
| CN117977531A (en) * | 2024-03-29 | 2024-05-03 | 杭州径上科技有限公司 | Self-adaptive power supply device, system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108964464B (en) | 2022-11-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101156304B (en) | Switched mode power converter and method of operation thereof | |
| US10425002B2 (en) | Error amplification apparatus and driving circuit including the same | |
| CN108093534B (en) | Control method, controller and LED driving device | |
| CN102118111B (en) | Integrated control circuit, method and switch power supply of primary side regulator | |
| US8143800B2 (en) | Circuits and methods for driving a load with power factor correction function | |
| US20100066337A1 (en) | Novel Utilization of a Multifunctional Pin Combining Voltage Sensing and Zero Current Detection to Control a Switched-Mode Power Converter | |
| CN102810984B (en) | Switching power circuit | |
| CN105281591A (en) | Control circuit and control method of power converter | |
| CN103475216A (en) | Power converter, clock module, control circuit and related control method | |
| CN106655777B (en) | Voltage drop compensation circuit and compensation method for output cable of switching power supply | |
| CN103716934A (en) | Driving circuit for driving light source, method and controller | |
| CN108923390A (en) | The system and method for overvoltage protection for LED illumination | |
| CN113228828B (en) | Control circuit, driving system, chip, control method and driving method | |
| CN101841242A (en) | Switch power supply and method for adjusting output current thereof | |
| CN104426374B (en) | Power conversion device and multiplication and division circuit | |
| KR20150083039A (en) | Cable compensation by zero-crossing compensation current and resistor | |
| CN109951925A (en) | Adjustable resistance and its current ripples of application eliminate circuit and line voltage compensation circuit | |
| CN102223067A (en) | Device and method for driving constant-current source load | |
| TWI533745B (en) | Light source driving circuit, controller and method for controlling power converter | |
| CN108964464A (en) | The circuit and its method of Switching Power Supply outlet side non-destructive testing load current | |
| JP2016528858A (en) | Converter unit and method for converting voltage | |
| CN105449995B (en) | Drive control circuit and drive control method and Switching Power Supply | |
| EP3278439B1 (en) | Constant on-time (cot) control in isolated converter | |
| US20110101931A1 (en) | Load adaptive DC Power Supply | |
| CN209435498U (en) | Protect circuit, LED drive control chip and LED drive control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |