Discharging Circuit Rapid Standby Voltage Removal
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Solution Overview
Problem
Conventional display devices with integrated power circuit boards that use a single transformer for both operating and standby voltages face issues with slow discharging during standby mode, leading to prolonged indicator light activation and user disturbance.
Innovation Solution
A discharging circuit comprising a controlling section with resistors and diodes, and a discharging section with transistors and capacitors, which rapidly disconnects the standby voltage when not needed, allowing for quick discharge and reducing discharging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the operating voltage and standby voltage are realized by the same transformer, then the number of transformers is reduced and the size of the integrated power circuit board is reduced, but the discharging speed of the standby voltage outputting terminal is slow when the power supply is turned off
Solution Approach 1:
The patent segments the power circuit board into distinct functional areas: the primary power transformation section using the transformer, and a separate discharging control section using a dedicated discharging circuit with switching elements. This segmentation allows the standby voltage output terminal to have specialized rapid discharging capability independent of the main power transformation function, resolving the contradiction between board size reduction and discharging speed.
Solution Approach 2:
The patent introduces a discharging circuit as an intermediary component between the transformer output and the standby voltage terminal. This intermediary circuit includes switching elements (such as MOSFETs or triacs) that can rapidly disconnect and discharge the standby voltage, enabling fast discharging without requiring a separate transformer while maintaining the benefit of using a single transformer for power transformation.
2Device complexity
If the standby voltage outputting terminal cannot perform rapid discharging, then the circuit structure remains simple, but the indicator light remains on for a long time causing user disturbance
Solution Approach 1:
The discharging circuit acts as an intermediary control mechanism that rapidly disconnects the standby voltage terminal from the transformer output when power is turned off. This intermediary switching circuit includes control elements that can quickly open the circuit path, enabling the indicator light to turn off immediately without requiring complex overall circuit redesign, thus resolving the contradiction between circuit simplicity and eliminating user disturbance.
Solution Approach 2:
The patent implements preliminary discharging action by providing a dedicated discharging circuit that is activated when power is turned off. This circuit preemptively and rapidly discharges any residual voltage at the standby terminal before it can cause the indicator light to remain on, preventing user disturbance before it occurs while maintaining relatively simple circuit architecture.
Data Source
AI summary
The present disclosure provides a discharging circuit, a power supply, and a display device for a rapid discharging, without causing any inconveniences to a user. The discharging circuit comprises a controlling section and a discharging section, wherein a controlling section is connected to a control voltage inputting terminal and a control node, and configured to adjust a voltage at the control node, under the control of a control voltage inputted from the control voltage inputting terminal; and a discharging section is connected to the control node, a first level terminal and a discharge voltage inputting terminal, and configured to conduct a connection between the discharge voltage inputting terminal and the first level terminal, under the control of the voltage at the control node, so as to discharge the discharge voltage inputting terminal through the first level terminal. Embodiments of the present disclosure may be used in the manufacture of display devices.