Primary side feedback active clamping flyback converter, controller and control method
A technology of flyback converter and primary side feedback, which is applied in control/regulation system, conversion of DC power input to DC power output, instruments, etc. It can solve the problems of high cost and low efficiency, and achieve easy implementation and simple control implementation , The effect of reducing the power supply development cost
Active Publication Date: 2021-06-18
NANJING UNIV OF SCI & TECH
View PDF4 Cites 6 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Therefore, the current edge feedback active clamp flyback converter has the disadvantages of high cost and low efficiency.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0089] The embodiment is based on the primary side feedback active clamp flyback converter, controller and control method to realize valley conduction, the primary side feedback active clamp flyback converter adopts 210Vac and 220Vac as input respectively, and the DCM mode The measured steady-state waveform under Figure 6 As shown, the upper part is the voltage sampling Vaux waveform of the auxiliary winding, with a division of 20V, and the lower one is the driving waveform Duty_sa of the auxiliary tube, with a division of 2V, from Figure 6 It can be seen that at the resonance peak of the auxiliary winding, the auxiliary tube is turned on, and the waveform of the auxiliary winding on the primary side corresponds to the peak value, then the Vds_sr of the auxiliary tube is the valley value. Therefore, it can be known from the measured waveform that the control method can realize the bottom of the auxiliary tube conduction.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a primary side feedback active clamping flyback converter, a controller and a control method. Based on the main topology circuit of the active clamping flyback converter, the controller comprises a current sampling module, a current estimation module, a peak current compensation module, a periodic conduction control module, a driving module, a valley bottom conduction module, a constant-current multi-mode control module, a PID module and a mode switching judgment module, and the controller is connected with a controlled switching power supply to form a closed loop. According to the valley bottom conduction mode of the valley bottom conduction module, an auxiliary switch tube is always switched on at the valley bottom when the system works under the condition of constant current output, so that the efficiency of the whole converter is greatly improved.
Description
technical field [0001] The invention relates to the technical field of isolated converters, in particular to a primary side feedback active clamp flyback converter, a controller and a control method. Background technique [0002] With the development of technology, switching power supply is widely used in small and medium power occasions. Isolated switching power supply can realize electrical isolation between input and output, and has the characteristics of safe isolation and high reliability. The isolated active clamp flyback converter replaces the traditional RCD clamping method by improving the clamping circuit. While recovering the leakage inductance energy of the transformer, it can realize the soft switching of the switching tube and greatly reduce the switching loss of the converter. , to increase the switching frequency of the converter, because the traditional active clamp flyback converter uses an optocoupler device to transmit the output voltage and current signa...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/335Y02B70/10
Inventor 康明才张翔王冲苏明洁陈依琳陈泽宇
Owner NANJING UNIV OF SCI & TECH