Switching power supply control circuit with secondary side feedback current detection
A switching power supply and control circuit technology, applied in power supply testing, control/regulation systems, electrical components, etc., can solve the problems of unrecognizable interference and single current detection method, so as to save test time, reduce test cost, and avoid misjudgment Effect
Active Publication Date: 2016-06-29
成都启臣微电子股份有限公司
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0007] In order to overcome the technical defects that the existing switching power supply control circuit has a single current detection method, cannot identify interference, and cannot use the CS pin for testing with an external voltage, the invention discloses a switching power supply control circuit with secondary side feedback current detection
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] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0016] The switching power supply control circuit with secondary side feedback current detection of the present invention includes a current detection pin, a power tube control pin, and a current comparator whose input terminal is connected to the current detection pin; it is characterized in that it also includes an input terminal A current signal logic circuit connected to the output end of the current comparator, and a first delay circuit whose input end is connected to the output end of the current signal logic circuit; the current signal logic circuit transmits the output signal logic of the current comparator to the second a delay circuit;
[0017] The first delay circuit realizes the following functions: when the input signal undergoes an edge transition representing that the voltage of the current detection pin is greater th...
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
A switch power source control circuit with a secondary side feedback current detection function comprises a current detection pin, a power control pin, a current comparator, a current signal logistic circuit, a first time-delay circuit, a second time-delay circuit, an OR logistic circuit and a counter, wherein the input end of the current comparator is connected with the current detection pin, two input ends of the OR logistic circuit are connected with the output end of the first time-delay circuit and the output end of the second time-delay circuit respectively, a resetting end of the counter is connected with the output end of the OR logistic circuit, a counting input end of the counter is connected with the input end of the current signal logistic circuit, when the counting value of the counter reaches a set value, a switch power tube is closed, and D1 is larger than D2. The switch power source control circuit with the secondary side feedback current detection function judges the overflow state of the power tube through the counting cycle, and avoids erroneous judgment by referring to switch signals of the power tube. Meanwhile, when the switch power source control circuit is used for test, the process that a chip is powered on again to be started when the test mode is stopped can be avoided, test time is saved, and test cost is lowered.
Description
technical field [0001] The invention belongs to the field of integrated circuit design and relates to a switching power supply control circuit, in particular to a switching power supply control circuit equipped with secondary side feedback current detection. Background technique [0002] With the strong demand for consumer electronic products and the upgrading of various electronic products, the requirements for power modules are also getting higher and higher. The power module usually provides constant voltage or constant current to the functional modules to ensure their stable operation. [0003] According to the sampling method of the control loop, the switching power supply can be divided into a current-type switching power supply and a voltage-type switching power supply. The voltage-type switching power supply only samples the output voltage, and the sampled signal is input to the error amplifier. Amplify to generate the COMP signal, and use the COMP analog voltage to...
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 Patents(China)
IPC IPC(8): H02M1/08G01R31/40H02M3/335
Inventor 向磊唐波吴强许刚颖朱樟明
Owner 成都启臣微电子股份有限公司