Micro-voltage-difference linear voltage-stabilizing power circuit

Abstract

The invention discloses a micro-voltage-difference linear voltage-stabilizing power circuit, which at least has a first path of output and a second path of output, wherein an output voltage of the first path of output is higher than the output voltage of the second path of output; the power circuit comprises an auxiliary power supply, a driving circuit, a feedback circuit and a power regulation device; a positive end of the second path of output is coupled to an input end of the feedback circuit; an output end of the feedback circuit is coupled to a control end of the driving circuit; the input end of the driving circuit is coupled to the positive end of the first path of output serving as the auxiliary power supply; the output end of the driving circuit is coupled to the control end of the power regulation device; the output end of the power regulation device is coupled to the positive end of the second path of output; and the driving circuit converts an output signal of an auxiliary voltage into a signal for controlling the output of the power regulation device according to the output of the feedback circuit to realize the output of a micro voltage difference. Output short circuit protection can be realized by further arranging a short-circuit protection circuit.

Description

technical field [0001] The invention relates to power supply equipment, in particular to a micro-voltage linear stabilized voltage supply circuit. Background technique [0002] Generally, two groups of switching power supplies use secondary rectification and filtering, and directly output the voltage to the system for power supply. Due to the characteristics of switching power supplies, when the system load is unbalanced, the switching power supplies share two or more output voltages of the transformer when cross-loading. It will deviate from the upper and lower limits of the standard value. For example, when one load is the minimum and the other load is the maximum, the two sets of voltages will drift. The voltage of the minimum load will exceed the upper limit of the standard, and the voltage of the maximum load will be lower than The lower limit of the standard exceeds the operating voltage range of the system, causing the system to fail to work normally. To solve this p...

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Problems solved by technology

In this way, the power consumption of the three-terminal voltage regulator itself is very large (taking 1A as an example, there will be a loss of 3-4W), so a large radiator must be used, which not only increases the cost but also increases the space.

2. Use the DC-DC scheme to convert high voltage into low voltage and small current, such as 1A. It works in the switch state, and the high-frequency interference is very large. EMI components need to be added, so the cost will increase. In addition, the 1A DC-DC chip also more expensive

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