Current surge control device and power supply starting equipment
By combining a rectifier, a voltage detector, and a timing control module, the problem of excessive surge current during LED display startup was solved, thus protecting the equipment and extending its lifespan.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TOP VICTORY INVESTMENTS LTD
- Filing Date
- 2024-11-05
- Publication Date
- 2026-05-08
AI Technical Summary
Existing LED display startup devices can cause excessive surge current when the switch is turned on, as the current is supplied instantaneously to multiple LED display cabinets, which can damage the equipment or affect its service life.
By employing a rectifier, voltage detector, timing control module, and switching device, surge current generation is suppressed through rectified voltage detection and timing control.
It effectively suppresses surge current during startup, protects LED display equipment, and extends its service life.
Smart Images
Figure CN122001201A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a power supply device, and more particularly to a power supply device for a display screen having multiple display enclosures. Background Technology
[0002] See Figure 1 An existing LED display startup device is used to start an LED display screen 9 composed of multiple LED display cabinets 91. Each LED display cabinet 91 has a converter for converting AC power to DC power, which is equivalent to a load capacitor. The LED display startup device includes an AC power supply 81 and a switch 82. The switch 82 controls the connection state between the AC power supply 81 and the LED display screen 9, and transmits the AC signal generated by the AC power supply 81 to the LED display screen 9 when activated. However, at the moment when the switch 82 is activated, because current needs to be supplied to multiple LED display cabinets 91 simultaneously, the AC power supply 81 is prone to generating a surge current, causing excessive current to flow through the LED display screen 9, which may lead to easy damage or affect its service life. Moreover, the magnitude of the surge current is related to the voltage value of the AC signal at the time when the switch 82 is activated. Summary of the Invention
[0003] The purpose of this invention is to provide a current surge control device.
[0004] The present invention provides a current surge control device, comprising a rectifier, a voltage detector, a timing control module, and a switching device.
[0005] The rectifier is used to receive an AC signal that includes multiple voltage zero points and to rectify the AC signal to generate a rectified voltage.
[0006] The voltage detector is electrically connected to the rectifier to receive the rectified voltage, and is used to generate a comparison result indicating the relationship between the voltage value of the AC signal and the critical voltage based on the relationship between the voltage value of the rectified voltage and the critical voltage, and to generate a trigger signal based on the comparison result.
[0007] The timing control module is electrically connected to the voltage detector to receive the trigger signal and generates an enable signal based on the trigger signal. The rising positive edge of the enable signal corresponds to one of the voltage zero points of the AC signal.
[0008] The switching device receives the AC signal and is electrically connected to the timing control module, and generates an output voltage proportional to the AC signal according to the turn-on signal.
[0009] Preferably, the switching device includes multiple switches, and the timing control module further generates an activation signal group including multiple activation signals, wherein the rising positive edge of each activation signal corresponds to a different voltage zero point, and each switch corresponds to an activation signal and is activated sequentially according to the activation signal.
[0010] Preferably, the timing control module includes a timer, which takes a time point when the trigger signal is received as a timing start point, and generates one of the start signals after timing a delay time from the timing start point.
[0011] Preferably, the voltage detector includes a voltage divider module and a voltage comparator module. The voltage divider module is electrically connected to the rectifier to receive the rectified voltage and divides the rectified voltage to generate a divided voltage. The voltage comparator module is electrically connected to the voltage divider module to receive the divided voltage and generates a comparison result based on the divided voltage and a threshold voltage, wherein the threshold voltage and the peak value of the divided voltage are proportional.
[0012] 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.
[0013] Preferably, the delay time is related to the period of the AC signal, and the ratio of the delay time to the period of the AC signal is related to the ratio of the peak value of the critical voltage to the peak value of the voltage divider.
[0014] Another object of the present invention is to provide a power-starting device with surge suppression function.
[0015] The power-starting device includes a power supply device and a current surge control device.
[0016] The power supply device generates a periodically varying AC signal, which includes multiple voltage zero points.
[0017] The current surge control device is electrically connected to the power supply device and includes a rectifier, a voltage detector, a timing control module, and a switching device.
[0018] The rectifier is used to receive an AC signal that includes multiple voltage zero points and to rectify the AC signal to generate a rectified voltage.
[0019] The voltage detector is electrically connected to the rectifier to receive the rectified voltage, and is used to generate a comparison result indicating the relationship between the voltage value of the AC signal and the critical voltage based on the relationship between the voltage value of the rectified voltage and the critical voltage, and to generate a trigger signal based on the comparison result.
[0020] The timing control module is electrically connected to the voltage detector to receive the trigger signal and generates an enable signal based on the trigger signal. The rising positive edge of the enable signal corresponds to one of the voltage zero points of the AC signal.
[0021] The switching device receives the AC signal and is electrically connected to the timing control module, and generates an output voltage proportional to the AC signal according to the turn-on signal.
[0022] Preferably, the switching device includes multiple switches, and the timing control module further generates an activation signal group including multiple activation signals, wherein the rising positive edge of each activation signal corresponds to a different voltage zero point, and each switch corresponds to an activation signal and is activated sequentially according to the activation signal.
[0023] Preferably, the timing control module includes a timer, which takes a time point when the trigger signal is received as a timing start point, and generates one of the start signals after timing a delay time from the timing start point.
[0024] Preferably, the voltage detector includes a voltage divider module and a voltage comparator module. The voltage divider module is electrically connected to the rectifier to receive the rectified voltage and divides the rectified voltage to generate a divided voltage. The voltage comparator module is electrically connected to the voltage divider module to receive the divided voltage and generates a comparison result based on the divided voltage and a threshold voltage, wherein the threshold voltage and the peak value of the divided voltage are proportional.
[0025] 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.
[0026] Preferably, the delay time is related to the period of the AC signal, and the ratio of the delay time to the period of the AC signal is related to the ratio of the peak value of the critical voltage to the peak value of the voltage divider.
[0027] The beneficial effect of the present invention is that the timing control module generates the turn-on signal at the zero point of the AC signal to start the switching device, thereby achieving the effect of suppressing surge current. Attached Figure Description
[0028] Figure 1 It is a block diagram illustrating an existing LED display startup device;
[0029] Figure 2 This is a block diagram illustrating the architecture of an embodiment of the power-starting device with surge suppression function of the present invention;
[0030] Figure 3 This is a block diagram illustrating the architecture of a voltage detector and a timing control module in the embodiment described above.
[0031] Figure 4 This is a timing diagram illustrating the relationship between an AC signal, a rectified voltage, and a group of turn-on signals in the described embodiment.
[0032] Figure 5 It is a timing diagram illustrating the relationship between the AC signal, the rectified voltage, the voltage divider, and the delay time in the embodiment described. Detailed Implementation
[0033] Before the invention is described in detail, it should be noted that similar components are represented by the same numbers in the following description.
[0034] See Figure 2 and Figure 3 One embodiment of the power-starting device of the present invention is used to start a display panel 7 comprising multiple display cabinets 71, wherein each display cabinet 71 can be equivalent to a load capacitor. When the display panel 7 is started, the magnitude of the surge current is proportional to the input AC voltage value; that is, the higher the AC voltage value at the moment of startup, the larger the surge current. The power-starting device includes a power supply device 1, a rectifier 2, a voltage detector 3, a timing control module 4, and a switching device 5.
[0035] The power supply device 1 generates a periodically varying AC signal, which includes multiple voltage zero points.
[0036] The rectifier 2 is electrically connected to the power supply device 1 to receive the AC signal and rectify the AC signal to generate a rectified voltage. In some embodiments, the rectifier 2 uses a bridge rectifier to convert the AC signal into the rectified voltage, but this is not a limitation.
[0037] The voltage detector 3 includes a voltage divider module 31 and a voltage comparator module 32.
[0038] The voltage divider module 31 includes a first resistor 311 and a second resistor 312. The first resistor 311 has a first terminal electrically connected to the rectifier 2 and a second terminal electrically connected to the voltage comparator module 32. The second resistor 312 has a first terminal electrically connected to the voltage comparator module 32 and a second terminal grounded. The voltage divider module 31 receives the rectified voltage and generates a divided voltage according to the ratio of the resistance value of the first resistor 311 to the resistance value of the second resistor 312. In some embodiments, the ratio of the resistance value of the first resistor 311 to the resistance value of the second resistor 312 is 100:1, but is not limited thereto.
[0039] The voltage comparison module 32 includes an operational amplifier 321, which has a non-inverting input terminal for receiving the divided voltage, an inverting input terminal for receiving a threshold voltage, and an output terminal. The threshold voltage is proportional to the peak value of the divided voltage. The operational amplifier 321 generates a comparison result indicating the relationship between the voltage value of the AC signal and the threshold voltage based on the divided voltage and the threshold voltage, and generates a trigger signal based on the comparison result and sends it to the timing control module 4.
[0040] The timing control module 4 includes a timer 41. The timer 41 takes the time point at which the trigger signal is received as a timing start point, and generates an activation signal after a delay time from the timing start point and sends it to the switching device 5. The rising positive edge of the activation signal corresponds to one of the zero points of the AC signal voltage, that is, the time point at which the switching device 5 receives the activation signal when the voltage value of the AC signal is zero, thereby minimizing the surge current generated by the power supply device 1 when the display cabinet 71 of the display panel 7 is activated.
[0041] It should be noted that the timer can be implemented using a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof, but is not limited thereto.
[0042] In some embodiments, the timing control module 4 generates a group of activation signals including multiple activation signals, wherein the rising positive edges of the activation signals correspond to different voltage zero points of the corresponding AC signal, so as to achieve a progressive start-up control timing, such as... Figure 4As shown. The display cabinet 71 is sequentially activated at different voltage zero points of the AC signal according to the activation signal, so that the power supply device 1 corresponds to a smaller load capacitance at the rising positive edge of each activation signal, thereby further suppressing the surge current generated when the display cabinet 71 is activated.
[0043] It should also be noted that, in some embodiments, the ratio of the delay time to one-quarter of the period of the AC signal is equal to the ratio of the peak value of the critical voltage to the peak value of the voltage divider. For example... Figure 5 The relationship between the AC signal, the rectified voltage, and the voltage divider is shown. In this embodiment, the ratio is set to 4, meaning that one-quarter of the AC signal period is four times the delay time. The critical voltage is then determined using the same ratio. Taking a 220V / 50Hz AC signal as an example, the delay time is set to 1.25ms. Using the principle of similar triangles, the ratio of the adjacent sides (i.e., the ratio of one-quarter of the AC signal period to the delay time in this embodiment) determines the ratio of the base side (i.e., the ratio of the voltage divider voltage to the critical voltage in this embodiment). Therefore, the critical voltage is determined to be 0.25 times the peak value of the voltage divider voltage. The peak value of the voltage divider is obtained by the ratio of the resistance values of the first resistor 311 and the second resistor 312 (i.e., 100:1) and is 0.01 times the peak value of the AC signal (i.e., 220V×√2=311V) (i.e., 3.11V). Thus, the critical voltage can be determined to be 0.78V. The above is an example of this embodiment and is not intended to limit the present invention.
[0044] The switching device 5 includes a plurality of switches 51, each of which receives the AC signal and is electrically connected to the timing control module 4. The switches 51 switch between being on and off according to the on signal. When on, each switch generates an output voltage proportional to the AC signal to the display panel 7.
[0045] It should be noted that after the switching device 5 receives the activation signal, a switching delay time is required for it to switch from non-conducting to conducting. This switching delay time is related to the type and model of the switch, and the delay time can be further adjusted by taking the switching delay time into account to meet different delay time requirements.
[0046] It should also be noted that in some embodiments, the switch 51 can be implemented by a relay, but this is not a limitation.
[0047] In summary, the above embodiments, by setting the ratio of the peak value of the critical voltage to the peak value of the voltage divider, enable the timing control module 4 to generate the turn-on signal at the time when the AC signal voltage is zero, thereby activating the switching device 5 and achieving the effect of suppressing surge current.
[0048] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.
Claims
1. A current surge control device, characterized in that, The current surge control device includes: A rectifier is used to receive an AC signal that includes multiple zero voltage points and to rectify the AC signal to generate a rectified voltage. A voltage detector, electrically connected to the rectifier to receive the rectified voltage, is used to generate a comparison result indicating the relationship between the voltage value of the AC signal and the critical voltage based on the relationship between the voltage value of the rectified voltage and the critical voltage, and to generate a trigger signal based on the comparison result; The timing control module is electrically connected to the voltage detector to receive the trigger signal and generates an enable signal based on the trigger signal. The rising positive edge of the enable signal corresponds to one of the voltage zero points of the AC signal. A switching device receives the AC signal and is electrically connected to the timing control module, and generates an output voltage proportional to the AC signal according to the turn-on signal.
2. The current surge control device according to claim 1, wherein the switching device includes a plurality of switches, the timing control module further generates an activation signal group including a plurality of activation signals, wherein the rising positive edge of the activation signal corresponds to a different voltage zero point, the switches correspond to the activation signals respectively, and are activated sequentially according to the activation signals respectively.
3. The current surge control device according to claim 2, characterized in that, The timing control module includes a timer, which takes the time point of receiving the trigger signal as the timing start point, and generates one of the start signals after timing a delay time from the timing start point.
4. The current surge control device according to claim 1, characterized in that, The voltage detector includes a voltage divider module and a voltage comparison module. The voltage divider module is electrically connected to the rectifier to receive the rectified voltage and divides the rectified voltage to generate a divided voltage. The voltage comparison module is electrically connected to the voltage divider module to receive the divided voltage, and generates the comparison result based on the divided voltage and the critical voltage. The critical voltage is proportional to the peak value of the divided voltage.
5. The current surge control device according to claim 4, characterized in that, The voltage comparison module includes an operational amplifier, which has 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.
6. The current surge control device according to claim 5, characterized in that, The delay time is related to the period of the AC signal, and the ratio of the delay time to the period of the AC signal is related to the ratio of the peak value of the critical voltage to the peak value of the voltage divider.
7. A power-start device with surge suppression function, used to start a display panel comprising multiple enclosures, characterized in that, The power-starting device includes: A power supply device that generates a periodically varying AC signal, the AC signal including multiple voltage zeros; A current surge control device, electrically connected to the power supply device, and comprising: A rectifier is used to receive the AC signal and rectify the AC signal to generate a rectified voltage. A voltage detector, electrically connected to the rectifier to receive the rectified voltage, is used to generate a comparison result indicating the relationship between the voltage value of the AC signal and the critical voltage based on the relationship between the voltage value of the rectified voltage and the critical voltage, and to generate a trigger signal based on the comparison result; The timing control module is electrically connected to the voltage detector to receive the trigger signal and generates an enable signal based on the trigger signal. The rising positive edge of the enable signal corresponds to one of the voltage zero points of the AC signal. A switching device receives the AC signal and is electrically connected to the timing control module, and generates an output voltage proportional to the AC signal according to the turn-on signal.
8. The power-starting device according to claim 7, characterized in that, The switching device includes multiple switches, and the timing control module also generates an activation signal group including multiple activation signals. The rising positive edge of each activation signal corresponds to a different voltage zero point. Each switch corresponds to an activation signal and is activated sequentially according to the activation signal.
9. The power-starting device according to claim 8, characterized in that, The timing control module includes a timer, which takes the time point of receiving the trigger signal as the timing start point, and generates one of the start signals after timing a delay time from the timing start point.
10. The power-starting device according to claim 7, characterized in that, The voltage detector includes a voltage divider module and a voltage comparison module. The voltage divider module is electrically connected to the rectifier to receive the rectified voltage and divides the rectified voltage to generate a divided voltage. The voltage comparison module is electrically connected to the voltage divider module to receive the divided voltage, and generates the comparison result based on the divided voltage and the critical voltage. The critical voltage is proportional to the peak value of the divided voltage.
11. The power-starting device according to claim 10, characterized in that, The voltage comparison module includes an operational amplifier, which has 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.
12. The power-starting device according to claim 11, characterized in that, The delay time is related to the period of the AC signal, and the ratio of the delay time to the period of the AC signal is related to the ratio of the peak value of the critical voltage to the peak value of the voltage divider.