Power Supply Control Circuit for OLED DC-DC Converters
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Solution Overview
Problem
Conventional power supplying units for organic light emitting displays can generate unintended power sequences due to the formation of current paths caused by the forward direction characteristics of diodes and inductors in DC-DC converters, leading to erroneous operations.
Innovation Solution
A control circuit is introduced between the input end of the power supplying apparatus and the DC-DC converters to control the timing of input voltage output, preventing the formation of unintended current paths and ensuring proper power sequencing by using a combination of PMOS and NMOS transistors and capacitors to manage the supply of voltage to multiple DC-DC converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DC-DC converters are used to generate power sources, then power conversion capability is improved, but unintended current paths are formed causing power sequence errors
Solution Approach 1:
A control circuit is introduced as an intermediary component between the power input and the DC-DC converters. This control circuit includes switching elements that mediate the power flow timing, preventing unintended current paths while maintaining the power conversion capability of the DC-DC converters.
Solution Approach 2:
The control circuit performs preliminary action by controlling the switching elements to establish the correct power sequence before the DC-DC converters operate. The switching elements are activated in a predetermined order to ensure that power is supplied to each DC-DC converter at the appropriate time, preventing premature operation and unintended current paths.
2Reliability
If switching elements are added to control power timing, then power sequence control is improved, but device complexity increases
Solution Approach 1:
The control circuit is segmented into multiple independent switching elements (first switching element, second switching element, third switching element), each controlling a specific aspect of the power sequence. This segmentation allows for modular control of power distribution to different DC-DC converters, improving reliability while keeping each switching element's function simple and well-defined.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents the change in power sequence caused by unintended current paths, ensuring stable and correct operation of the organic light emitting display by controlling the output timing of the input voltage to the DC-DC converters, thereby maintaining the intended power supply order.
Implementation Method 1
a first switching element (TR1) having a gate electrode coupled to a first node and coupled between an input end and an output end of the control circuit, a second switching element (TR2) having a gate electrode to which a control signal is applied, the second switching element being coupled between the input end of the control circuit and the first node, and a third switching element (TR3) having a gate electrode to which a control signal is applied, the third switching element being coupled between the first node and ground
Data Source
AI summary
There is provided a power supplying apparatus for an organic light emitting display in which a control circuit is provided between the input end of the power supplying apparatus and DC-DC converters for generating power sources in order to prevent a power sequence from being changed by the unintentional formation of a current path. The power supplying apparatus for an organic light emitting display includes a first switching element having a gate electrode coupled to a first node and coupled between an input end and an output end of the control circuit, a second switching element, to whose gate electrode a control signal is applied and which is coupled between the input end of the control circuit and the first node, and a third switching element, to whose gate electrode the control signal is applied and which is coupled between the first node and a ground.