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CN-122001201-A - Current surge control device and power supply starting equipment

CN122001201ACN 122001201 ACN122001201 ACN 122001201ACN-122001201-A

Abstract

A power supply starting device with a current surge control device and a power supply starting function comprises a power supply device and a current surge control device. The power supply device generates a periodically varying alternating current signal. The current surge control device comprises a rectifier, a voltage detector, a time sequence control module and a switching device. The rectifier rectifies the alternating current signal to generate a rectified voltage. The voltage detector generates a trigger signal according to the magnitude relation between the voltage value of the rectified voltage and the critical voltage. The time sequence control module generates an opening signal of which the rising positive edge corresponds to the voltage zero point of the alternating current signal according to the trigger signal, and the switching device receives the alternating current signal and generates output voltage according to the opening signal. The voltage detector enables the time sequence control module to generate an opening signal at the time point when the voltage of the alternating current signal is zero according to the relation between the divided voltage and the critical voltage so as to start the switching device, thereby realizing the effect of inhibiting the surge current.

Inventors

  • XIE BINGXUN
  • LIANG HONGCHANG

Assignees

  • 冠捷投资有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (12)

  1. 1. A current surge control device is characterized in that, the current surge control apparatus includes: The rectifier is used for receiving an alternating current signal comprising a plurality of voltage zero points and rectifying the alternating current signal to generate a rectified voltage; The voltage detector is electrically connected with the rectifier to receive the rectified voltage, and is used for generating a comparison result for indicating the magnitude relation between the voltage value of the alternating current signal and the critical voltage according to the magnitude relation between the voltage value of the rectified voltage and the critical voltage and generating a trigger signal according to the comparison result; The time sequence control module is electrically connected with the voltage detector to receive the trigger signal and generate an opening signal according to the trigger signal, and the rising positive edge of the opening signal corresponds to one of the voltage zero points of the alternating current signal; The switching device is used for receiving the alternating current signal and is electrically connected with the time sequence control module, and generates output voltage proportional to the alternating current signal according to the starting signal.
  2. 2. The current surge control apparatus according to claim 1, wherein the switching apparatus comprises a plurality of switches, the timing control module further generates a turn-on signal group comprising a plurality of the turn-on signals, rising positive edges of the turn-on signals respectively correspond to different voltage zero points, and the switches respectively correspond to the turn-on signals and are sequentially turned on according to the turn-on signals.
  3. 3. The current surge control apparatus according to claim 2, wherein the timing control module comprises a timer that generates one of the on signals based on a time point of receiving the trigger signal as a timing start point and after a delay time from the timing start point.
  4. 4. The current surge control apparatus according to claim 1, wherein the voltage detector comprises a voltage dividing module and a voltage comparing module, The voltage dividing module is electrically connected with the rectifier to receive the rectified voltage and divide the rectified voltage to generate divided voltage, The voltage comparison module is electrically connected with the voltage division module to receive the divided voltage and generate the comparison result according to the divided voltage and the critical voltage, wherein the critical voltage and the peak value of the divided voltage are in proportion.
  5. 5. The current surge control apparatus of claim 4 wherein the voltage comparison module comprises an operational amplifier having a non-inverting input receiving the divided voltage, an inverting input receiving the threshold voltage, and an output providing the comparison result.
  6. 6. The apparatus according to claim 5, wherein the delay time is related to a period of the ac signal, and the proportional relationship with the period of the ac signal is related to the ratio of the threshold voltage to the peak value of the divided voltage.
  7. 7. A power supply starting apparatus having a surge suppressing function for starting a display panel including a plurality of cases, the power supply starting apparatus comprising: A power supply device for generating a periodically varying alternating current signal, the alternating current signal comprising a plurality of voltage zeros; the current surge control device is electrically connected with the power supply device and comprises: The rectifier is used for receiving the alternating current signal and rectifying the alternating current signal to generate a rectified voltage; The voltage detector is electrically connected with the rectifier to receive the rectified voltage, and is used for generating a comparison result for indicating the magnitude relation between the voltage value of the alternating current signal and the critical voltage according to the magnitude relation between the voltage value of the rectified voltage and the critical voltage and generating a trigger signal according to the comparison result; The time sequence control module is electrically connected with the voltage detector to receive the trigger signal and generate an opening signal according to the trigger signal, and the rising positive edge of the opening signal corresponds to one of the voltage zero points of the alternating current signal; The switching device is used for receiving the alternating current signal, is electrically connected with the time sequence control module and generates output voltage proportional to the alternating current signal according to the starting signal.
  8. 8. The power supply starting apparatus according to claim 7, wherein the switching device includes a plurality of switches, the timing control module further generates a group of on signals including a plurality of the on signals, rising positive edges of the on signals respectively correspond to different voltage zero points, and the switches respectively correspond to the on signals and are sequentially turned on according to the on signals, respectively.
  9. 9. The power supply starting apparatus according to claim 8, wherein the timing control module includes a timer that takes a time point at which the trigger signal is received as a starting point of time, and generates one of the start signals after a delay time from the starting point of time.
  10. 10. The power supply starting apparatus according to claim 7, wherein the voltage detector comprises a voltage dividing module and a voltage comparing module, The voltage dividing module is electrically connected with the rectifier to receive the rectified voltage and divide the rectified voltage to generate divided voltage, The voltage comparison module is electrically connected with the voltage division module to receive the divided voltage and generate the comparison result according to the divided voltage and the critical voltage, wherein the critical voltage and the peak value of the divided voltage are in proportion.
  11. 11. The power supply start-up device of claim 10, wherein the voltage comparison module comprises an operational amplifier having a non-inverting input that receives the divided voltage, an inverting input that receives the threshold voltage, and an output that provides the comparison result.
  12. 12. The power supply starting apparatus according to claim 11, wherein the delay time is related to a period of the alternating current signal, and a proportional relationship with the period of the alternating current signal is related to the proportional value of the threshold voltage and the peak value of the divided voltage.

Description

Current surge control device and power supply starting equipment Technical Field The present invention relates to a power supply apparatus, and more particularly, to a power supply apparatus having a display screen with a plurality of display cases. Background Referring to fig. 1, a conventional LED display panel starting apparatus is provided for starting an LED display panel 9 composed of a plurality of LED display cases 91, each LED display case 91 having a converter for converting alternating current to direct current and being equivalent to a load capacitor. The LED display screen starting device comprises an ac power supply 81 and a switch 82, wherein the switch 82 controls the connection state between the ac power supply 81 and the LED display screen 9, and transmits an ac signal generated by the ac power supply 81 to the LED display screen 9 when the LED display screen is started. However, at the time point when the switch 82 is activated, since current needs to be simultaneously supplied to the plurality of LED display boxes 91 instantaneously, the ac power supply 81 easily generates a surge current, which causes excessive current flowing through the LED display 9 and causes a fear of easy damage or life-time influence, and the magnitude of the surge current is related to the current voltage value corresponding to the ac signal when the switch 82 is activated. Disclosure of Invention The invention aims to provide a current surge control device. The invention relates to a current surge control device, which comprises a rectifier, a voltage detector, a timing control module and a switching device. The rectifier is used for receiving an alternating current signal comprising a plurality of voltage zero points and rectifying the alternating current signal to generate a rectified voltage. The voltage detector is electrically connected with the rectifier to receive the rectified voltage, and is used for generating a comparison result for indicating the voltage value of the alternating current signal and the critical voltage according to the magnitude relation of the voltage value of the rectified voltage and the critical voltage, and generating a trigger signal according to the comparison result. The time sequence control module is electrically connected with the voltage detector to receive the trigger signal and generate an opening signal according to the trigger signal, and the rising positive edge of the opening signal corresponds to one of the voltage zero points of the alternating current signal. The switch device receives the alternating current signal and is electrically connected with the time sequence control module, and generates an output voltage proportional to the alternating current signal according to the starting signal. Preferably, the switching device includes a plurality of switches, the timing control module further generates an opening signal group including a plurality of opening signals, rising positive edges of the opening signals respectively correspond to different voltage zero points, and the switches respectively correspond to the opening signals and are sequentially opened according to the opening signals. Preferably, the timing control module includes a timer, wherein the timer is used as a timing starting point according to a time point of receiving the trigger signal, and generates one of the start signals after a delay time is counted from the timing starting point. Preferably, the voltage detector includes a voltage dividing module and a voltage comparing module, wherein the voltage dividing module is electrically connected to the rectifier to receive the rectified voltage and divide the rectified voltage to generate a divided voltage. The voltage comparison module is electrically connected with the voltage division module to receive the divided voltage and generate the comparison result according to the divided voltage and the critical voltage, wherein the critical voltage and the peak value of the divided voltage form a ratio. Preferably, the voltage comparison module includes an operational amplifier having a non-inverting input terminal for receiving the divided voltage, an inverting input terminal for receiving the threshold voltage, and an output terminal for providing the comparison result. Preferably, the delay time is related to a period of the ac signal, and the proportional relationship between the delay time and the period of the ac signal is related to the ratio between the threshold voltage and the peak value of the divided voltage. Another object of the present invention is to provide a power supply starting apparatus with a surge suppressing function. The power starting device comprises a power supply device and a current surge control device. The power supply device generates a periodically varying alternating current signal, wherein the alternating current signal comprises a plurality of voltage zero points. The current surge control device is electrical