Power converter and differential circuit
A differential circuit and circuit technology, applied in the direction of logic circuit connection/interface layout, no intermediate conversion to AC conversion equipment, etc., can solve the problems of interference with the normal adjustment of the error amplifier, instability, errors, etc., to avoid relative deviation, work stable effect
Active Publication Date: 2012-04-18
WUXI ZGMICRO ELECTRONICS CO LTD
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Problems solved by technology
When the overvoltage detection threshold becomes too small, and due to some factors such as noise, it may cause the overvoltage comparator to erroneously detect the overvoltage state even when the error amplifier is performing normal loop adjustment, resulting in an error Interfere with the normal adjustment of the error amplifier and produce unstable
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[0019] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Words related to electrical connection such as "connected", "connected to" and "connected to" herein may indicate direct or indirect electrical connection.
[0020] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.
[0021] The invention provides a differential circuit, which is formed by multiplexing an input stage circuit of an error amplifier and an overvoltage comparator and / or an...
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The invention provides a differential circuit, which comprises an input stage circuit containing a first differential transistor and a second differential transistor, wherein a gate of the first differential transistor serves as a first voltage input by the first input end, and a gate of the second differential transistor serves as a second voltage input by the second input end; an amplification output stage circuit connected with the input stage circuit and used for amplifying a difference between the first voltage and the second voltage and then outputting the amplified difference; and a comparison output stage circuit connected with the input stage circuit and used for comparing whether the difference between the first voltage and the second voltage is greater than a first preset value. Compared with prior art, the power converter and the differential circuit disclosed by the invention enable an error amplifier and an overvoltage comparer and / or an under-voltage comparer to multiplex the input stage circuit so as to avoid an additional relative deviation caused by the process when an independent input stage circuit is used and further enable the overvoltage comparer to work more steadily.
Description
【Technical field】 [0001] The invention relates to the field of power supply design, in particular to a power converter and a differential circuit therein. 【Background technique】 [0002] In a DC-DC power converter, an error amplifier, an undervoltage comparator, and an overvoltage comparator are generally included. The function of the error amplifier is to detect the difference between the output feedback voltage and the reference voltage, and work with the entire negative feedback loop to adjust the output voltage to a state where the output feedback voltage and the reference voltage are equal. The undervoltage comparator detects whether the output voltage is in an undervoltage state, and is generally set to 95% of the target output voltage, which is the undervoltage detection threshold. The overvoltage comparator detects whether the output voltage is in an overvoltage state, and is generally set to 105% of the target output voltage, which is the overvoltage detection thre...
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IPC IPC(8): H03K19/0175H02M3/10
Inventor 王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD