Feedback circuit for switching power supply, and switching power supply comprising feedback circuit
A feedback circuit, switching power supply technology, applied in the direction of electrical components, output power conversion devices, etc., can solve problems such as affecting reception and leakage of light-emitting diodes
Active Publication Date: 2017-05-10
MICRO MOTION INC
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
But for this kind of application, the slot will make the light of LED 201 leak out from the slot, affecting the reception, so this method has limitations.
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 Construction
[0015] Embodiments of the present invention will be described below with reference to the drawings. It should be noted that representation and description of components and processes that are not related to the present invention and known to those skilled in the art are omitted from the drawings and descriptions for the purpose of clarity.
[0016] image 3 is a circuit schematic diagram illustrating a feedback circuit 300 according to an embodiment of the present invention.
[0017] Figure 4 is a cross-sectional view schematically showing the arrangement of the light emitting device 302 and the receiving device 303 in the feedback circuit 300 according to the embodiment of the present invention.
[0018] Such as image 3 As shown, the feedback circuit 300 may include an input operational amplifier circuit 301 , a light emitting device 302 , a receiving device 303 and an output operational amplifier circuit 304 . Combine below image 3 and Figure 4 Describe these four ...
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 relates to a feedback circuit for a switching power supply, and the s switching power supply comprising the feedback circuit. The feedback circuit can comprise an input operation amplification circuit which amplifies an electric signal from a secondary side of a transformer in the switching power supply; a light-emitting device which is driven by the input operation amplification circuit to emit light; a receiving device which receives the light emitted by the light-emitting device and converts the received light into an electric signal; and an output operation amplification circuit which enables the electric signal converted by the receiving device to be amplified and then fed back to a primary side of the transformer in the switching power supply. The light-emitting device and the receiving device are disposed on the same surface of a printed circuit board at a preset interval, and a nonopaque blocking material is disposed between the light-emitting device and the receiving device. A lighttight shielding cover covers the light-emitting device, the receiving device and the blocking material, or glue is directly poured at the periphery of the light-emitting device, the receiving device and the blocking material, so as to guarantee that the light emitted by the light-emitting device cannot be leaked.
Description
technical field [0001] The present invention generally relates to the field of switching power supplies, and in particular relates to a feedback circuit in which a light-transmitting barrier is arranged between a light-emitting device and a receiving device, and a switching power supply comprising the feedback circuit. Background technique [0002] In the isolated switching power supply circuit using closed-loop control mode, the output voltage needs to be fed back to the control chip on the primary side of the transformer, and the control chip performs pulse width modulation (PWM) or pulse frequency modulation (PFM) according to the signal fed back from the output terminal. , so as to adjust the switching frequency or duty cycle of the field effect transistor, so that the output is stable, thereby realizing closed-loop control. Since the signal between the primary side and the secondary side of the transformer is isolated, the output signal cannot be directly connected back...
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): H02M1/00
Inventor 张梅高凤川赵恒
Owner MICRO MOTION INC