Circuit for regulating lower limit of limiting switch power source voltage

A power supply voltage and limit switch technology, which is applied in the direction of adjusting electric variables, control/regulation systems, instruments, etc., can solve problems such as loop instability, wide adjustable range, low lower limit output voltage, etc. It is easy to achieve stability and improve Power supply reliability, the effect of reducing the adjustment range

Inactive Publication Date: 2008-05-14
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to meet the high-end adjustable range, the problem that the low-end adjustable range is wider than the design target often occurs, that is, the lower limit output voltage is too low, which will cause loop instability and affect power supply reliability.

Method used

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  • Circuit for regulating lower limit of limiting switch power source voltage
  • Circuit for regulating lower limit of limiting switch power source voltage
  • Circuit for regulating lower limit of limiting switch power source voltage

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Embodiment Construction

[0011] exist figure 1 , figure 2 The schematic block diagram shown includes: an input circuit, a main power circuit, an output circuit, a feedback circuit and a main control circuit connected in sequence, the output pulse of the main control circuit controls the opening and closing of the main power circuit, It is characterized in that the feedback circuit includes a controllable switch; the port 1 of the controllable switch detects the output voltage, and the ports 2 and 3 of the controllable switch are controlled to short-circuit or disconnect according to the detected output voltage to connect or disconnect the feedback circuit.

[0012] When the output voltage is greater than the set minimum voltage, the controllable switch is turned on, and the input voltage is rectified and filtered by the input circuit and then added to the main power circuit. After the DC-AC is converted into a rectangular wave in the main power circuit, the output circuit It is rectified and filtere...

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PUM

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Abstract

A circuit for restricting the lower limit of adjustable voltage of switching power supply is sequentially composed of input circuit, primary power circuit, output circuit, feedback circuit and primary control circuit with output pulse to control the switch of primary power circuit. Said feedback circuit has a controllable switch able to detect the output voltage of outupt circuit. When output voltage is higher than said lower limit, the controllable switch is turned on to allow the power supply to work normally. When output voltage is equal to said lower limit, the controllable switch is turned off to inhibit the voltage from being regulated lowforward.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a pulse width modulation (PWM) switching power supply with an adjustable output (TRIM) terminal. Background technique [0002] At present, the application of switching power supply with TRIM terminal is more and more extensive. In terms of circuit design, the adjustment range of the output voltage can meet the requirements through the combination of the output sampling resistor and the TRIM terminal resistor. However, in order to meet the high-end adjustable range, the problem that the low-end adjustable range is wider than the design target often occurs, that is, the lower limit output voltage is too low, which will lead to loop instability and affect power supply reliability. Contents of the invention [0003] The technical problem to be solved by the present invention overcomes the above-mentioned shortcomings, makes the loop easy to adjust and stabilize, and improves the reliabi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/46
Inventor 高晓光
Owner ZTE CORP
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