LNB Power Supply Circuit for Stable Current Distribution
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Solution Overview
Problem
Conventional LNBs experience noise and malfunction when switching reception channels due to variations in direct-current voltages from multiple receivers, leading to uneven current distribution and potential apparatus failure, especially when receivers with different current capacities are connected.
Innovation Solution
A receiver apparatus with pre-regulators, a bypass portion, and main regulators that ensures constant current extraction from multiple receivers by short-circuiting output terminals when potential differences exceed a threshold, maintaining stable power supply to internal circuits despite voltage variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional LNB simply adds currents from multiple receivers through diodes, then the circuit structure is simple, but current distribution becomes uneven when voltage differences exist, causing noise and malfunction
Solution Approach 1:
The power supply circuit is divided into multiple independent power supply units, each corresponding to a specific receiver port. Each unit includes its own current extraction circuit and control mechanism, allowing independent current management for each receiver connection. This segmentation enables precise control of current distribution to each receiver, preventing the noise and malfunction issues caused by uneven current sharing in conventional designs.
Solution Approach 2:
The invention incorporates feedback mechanisms where the control circuit monitors voltage levels and current extraction status from multiple receivers. Based on this feedback information, the control circuit dynamically adjusts the operating state of each power supply unit to maintain balanced current distribution. This feedback control ensures that when voltage differences exist between receivers, the system automatically compensates to prevent current imbalance, noise, and malfunction.
2Reliability
If current extraction is controlled to prevent noise, then reception stability improves, but the system becomes more complex requiring additional control circuits
Solution Approach 1:
The invention applies local quality by providing differentiated power supply control for each receiver port. Each power supply unit is tailored to its specific port's requirements, with localized current extraction and control circuits. This allows the system to optimize reception stability for each connection independently, managing complexity at the local level rather than requiring a single complex centralized control system.
Solution Approach 2:
The control circuit performs preliminary assessment of voltage levels and receiver states before current extraction begins. By pre-evaluating the conditions at each port and pre-configuring the appropriate power supply unit states, the system prevents noise and instability issues before they occur. This preliminary action reduces the need for complex real-time adjustments during operation.
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
Prevents noise and malfunctioning by ensuring consistent current extraction from all receivers, even with instantaneous voltage changes, allowing for reliable operation and clear images without the need for complex circuitry or high costs.
Implementation Method 1
a bypass portion that, when the potential difference between the output terminals of the pre-regulators is greater than a predetermined threshold value, short-circuits together the output terminals
Implementation Method 2
the rectifying action of the diodes Da and Db prevents backflow current from the higher-potential port to the lower-potential port
Data Source
AI summary
In an LNB 10, a power supply circuit 12 has pre-regulators PRa and PRb provided one for each of power supply paths respectively from ports 13a and 13b, a bypass portion BP that, when the potential difference between the output terminals of the pre-regulators PRa and PRb is greater than a predetermined threshold value, short-circuits together those output terminals, and main regulators REG1 and REG2 provided in the stage following the bypass portion BP to generate, from the output voltages Va′ and Vb′ of the pre-regulators PRa and PRb, drive voltages VA and VB for the internal circuits A and B. With this circuit configuration, simple though it is, even if there are instantaneous variations in the voltages fed from a plurality of receivers connected, no variations appear in the currents respectively extracted therefrom.