An output voltage sampling feedback device and method for a negative input and negative output power supply
An output voltage, feedback device technology, applied in the output power conversion device, the conversion of DC power input to DC power output, electrical components and other directions, to achieve the effect of ensuring the control and adjustment function
Active Publication Date: 2022-03-29
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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[0005] In view of this, the object of the present invention is to propose an output voltage sampling feedback device and method for a negative input and negative output power supply to solve the aforementioned problems
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[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0034] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention shall have the usual meanings understood by those skilled in the art to which the present disclosure belongs. "First", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "connected" are not limited to physical or mechan...
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The invention provides an output voltage sampling feedback device and method of a negative input and negative output power supply: the main power circuit is connected to the control circuit through a switch tube, the output end of the main power circuit is connected to the sampling feedback circuit; the sampling feedback circuit is connected to the control circuit, Detect the output negative voltage, convert the output negative voltage to a voltage that takes the input negative voltage as a reference, and then feed it back to the control circuit; the control circuit compares the fed back output negative voltage with the reference voltage, and controls the power device of the main power circuit to turn on and occupy The empty ratio adjusts the output negative voltage; the sampling feedback circuit includes: a second triode, a third triode, a first resistor and a second resistor; the second triode and the third triode constitute a current mirror. When the absolute value of the input negative voltage is close to the absolute value of the output negative voltage, the feedback input terminal of the control circuit can be sampled to obtain a normal voltage, so as to ensure that the control and adjustment function of the conversion circuit is normal. Also suitable for negative input negative output boost voltage power conversion.
Description
technical field [0001] The invention relates to the field of electronic and electrical technologies, in particular to an output voltage sampling and feedback device and method for a negative input and negative output power supply. Background technique [0002] In the power supply with non-isolated negative input and negative output, the control circuit on the input side uses the input negative line as the reference "ground", while the sampling circuit on the output side uses the output negative line as the reference "ground". The two "grounds" are not equal. Potential, therefore, poses great difficulties for feedback control. [0003] At present, there are mainly two schemes for the research on the voltage conversion of negative input and negative output. One is that the output voltage feedback method adopts a method similar to an isolated power supply, which is composed of multiple devices such as optocouplers and references. In this scheme, the power conversion The loop d...
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IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor 李灿曾理曾宏张顺彪罗慧唐清王三虎胡丹华
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST