Voltage effectiveness value sampling method applied to alternating-current voltage-stabilizing power supply

An AC regulated power supply, voltage RMS technology, applied in the field of voltage RMS sampling, can solve the problems of deviation between the sampled voltage value and the real voltage value, weakened anti-interference ability, exceeding the predetermined accuracy, etc., to achieve numerical stability, CPU computing Low volume, the effect of eliminating interference

Inactive Publication Date: 2016-09-21
ZHEJIANG TTN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the frequency of the power grid changes, when the number of sampling points and the time interval remain unchanged, there will be a deviation between the sampled voltage value and the real voltage value, which exceeds its predetermined accuracy, and in severe cases will cause it to fail to work normally
Although the collection interval can be shortened, the collection points can be increased, and the deviation value of the voltage can be reduced, but this requires large-capacity memory support, which is prone to crashes, and the anti-interference ability will also be weakened, which is also its disadvantage.

Method used

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  • Voltage effectiveness value sampling method applied to alternating-current voltage-stabilizing power supply
  • Voltage effectiveness value sampling method applied to alternating-current voltage-stabilizing power supply

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Embodiment 1

[0019] Such as figure 1 As shown, the first embodiment adopts the peak sampling method to describe its sampling process in detail, and it includes the following steps:

[0020] (1) Set the sampling reference voltage value K: the sampling reference voltage value K according to (U max -A)≤K≤U max Select settings, U inmax It is the peak value of the minimum input voltage when the regulated power supply is working normally, A is the voltage adjustment range of the sampling interval, 0<A≤10V;

[0021] (2) Set the sampling frequency f s : The sampling frequency f s It is more than 10 times the standard power grid frequency f;

[0022] (3) Input voltage U 0 Acquisition and comparison: input voltage U at set time intervals 0 For instantaneous acquisition, the input voltage U collected will be 0 Compared with the sampling reference voltage value K;

[0023] (4) Start the real-time voltage sample collection of the power supply: when the input voltage U 0 When meeting the selec...

Embodiment 2

[0030] Such as figure 2 As shown, the difference between the second embodiment and the first embodiment is that it adopts the valley sampling method. In the specific implementation process, the main differences are as follows:

[0031] (1) The set value of the sampling reference voltage value K is different: the sampling reference voltage value K is according to U min ≤K≤(U min +A) select setting, U inmin It is the valley value of the minimum input voltage when the regulated power supply works normally, A is the voltage adjustment range of the sampling interval, 0

[0032] (2) To compare the voltage sample values, the function relationship adopted is different, and the judgment objects are different:

[0033] The comparison of the voltage sample values ​​U1, U2, U3, U4, and U5 of the initial sample is compared according to the relationship of U1>U2≥U3≤U4<U5;

[0034] When the voltage sample values ​​U1, U2, U3, U4, and U5 satisfy the relationship U1>U2≥U3≤U4min . ...

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Abstract

The invention relates to an AC stabilized power supply technology, in particular to a voltage effective value sampling method applied to an AC stabilized voltage power supply. It includes sampling reference voltage value setting, input voltage acquisition and comparison, real-time voltage sample acquisition time start, real-time voltage sample acquisition of power supply according to the set sampling frequency, voltage sample value comparison, judgment of instantaneous voltage valley or peak occurrence timing, and determination AC regulated power supply voltage effective value and other steps, the purpose of which is to propose a voltage rms sampling method applied to AC regulated power supply, so that it can work normally when the frequency of the grid changes, and at the same time improve efficiency and Anti-interference performance. Compared with the prior art, it has the advantages of less sampling points, low CPU calculation load, high execution speed, and small voltage deviation when the voltage frequency changes.

Description

technical field [0001] The invention relates to an AC stabilized power supply technology, in particular to a voltage effective value sampling method applied to an AC stabilized voltage power supply. Background technique [0002] At present, the known stabilized power supply can work under the grid condition of a specific frequency (50Hz / 60Hz). The principle of sampling is to replace the voltage value at this time with the approximate effective value of the voltage. The sampling method is: under the premise of known power grid frequency (for example, the mains frequency in our country is 50Hz), within a cycle of the voltage, sampling is performed at a certain time interval, and then the root mean square value of all sampling points is used to represent this The effective value of the voltage at the time. However, when the frequency of the power grid changes and the number of sampling points and the time interval remain unchanged, there will be a deviation between the sample...

Claims

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Application Information

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IPC IPC(8): G01R19/02G01R31/42
CPCG01R19/02G01R31/42
Inventor 滕敏亮滕军腾腾江先志王耀华
Owner ZHEJIANG TTN ELECTRIC
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