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Undervoltage warning method, undervoltage warning circuit and switching power supply

A technology of alarm circuit and power supply, applied in the protection of under-voltage or no-voltage response, emergency protection circuit devices, electrical components, etc., which can solve the problems of indistinguishability

Inactive Publication Date: 2009-02-04
ORMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the above combined state, for the insufficient output voltage caused by the overcurrent and the service life of the power supply, since the combined state of the state of the LED unit 12c and the state of the output transistor 12d is the same, it cannot be distinguished that the cause of the insufficient output voltage is caused by the load The abnormality is caused by the abnormality of the power supply

Method used

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  • Undervoltage warning method, undervoltage warning circuit and switching power supply
  • Undervoltage warning method, undervoltage warning circuit and switching power supply
  • Undervoltage warning method, undervoltage warning circuit and switching power supply

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Embodiment Construction

[0020] Hereinafter, the undervoltage alarm method of the embodiment of the present invention will be described in detail with reference to the accompanying drawings: figure 1 It is a schematic diagram of the overall composition of the PLC control system, figure 2 for figure 1 Schematic diagram of switching power supply and undervoltage cause alarm circuit, image 3 is the action time diagram of the switching power supply, Figure 4 It is the undervoltage alarm status table.

[0021] refer to figure 1 , 10 is a switching power supply, 20 is a load device, 30 is a PLC controller (industrial sequence generator), 40 is a control device, and 50 is an alarm indicator light. 12 and 13 are undervoltage alarm circuits. The switching power supply 10 converts the AC input into DC, and supplies the DC output to the load device 20 and the PLC controller 30 . The PLC controller 30 controls the control device 40 . The switching power supply 10 activates protection functions accord...

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Abstract

A method for identifying a cause for insufficiency of an output voltage reduced to or below an undervoltage set value comprises a first comparison step for comparing the output voltage to a fixed first undervoltage set value and a second comparison step for comparing the output voltage to a second undervoltage set value that follows up the output voltage with a time lag, wherein the cause for the output voltage insufficiency is identified based on the steps and notified as a warning. As a preferable mode, the first undervoltage set value is set by means of a reverse conducting voltage of a voltage regulating diode and the second undervoltage set value is set by means of a charging voltage of a capacitor for directly or indirectly charging the output voltage.

Description

technical field [0001] The invention relates to an insufficient output voltage alarm method for identifying the insufficient cause of the output voltage falling below or equal to an undervoltage set value and issuing an alarm, an insufficient output voltage alarm circuit for implementing the method, and a switching power supply. Background technique [0002] Patent Document 1 discloses a power supply that displays and monitors the operating state of the power supply through a display. In this power supply, two displays show whether there is a short circuit between the output terminals. However, when the output voltage of the power supply is insufficient, it may cause malfunction of electronic equipment, etc. Therefore, it is disclosed that an undervoltage alarm circuit is additionally provided to the power supply to warn that the output voltage is insufficient. Figure 5 Represents the existing undervoltage alarm circuit 12 . In the insufficient output voltage alarm circuit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/24H02H7/10H02M3/28
CPCG01R19/16538B05B11/0059B05B11/1011
Inventor 大场恒俊
Owner ORMON CORP