Inkjet Head Diode Circuit for Power Supply Stability
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Solution Overview
Problem
Inkjet printers face issues with power supply voltage integrity due to connection failures between the head controller and driver IC, leading to potential through-currents and instability in inkjet head operations.
Innovation Solution
The inkjet head incorporates a driver IC with a logic circuit and level shifter, a logic power supply circuit, and a first diode, where the diode's anode is connected to a second voltage input and its cathode to the power supply input terminal of the logic power supply circuit, ensuring voltage stability and preventing through-currents by utilizing the power supply voltage VCC to maintain the potential of the power supply input terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the head controller inputs and interrupts the plurality of power supply voltages based on a predetermined order, then the through-current is prevented from flowing in the driver IC, but if a connection failure exists in the wiring, the power supply voltage order does not correspond to the predetermined order and the power supply cannot be ensured
Solution Approach 1:
The patent introduces a logic power supply circuit as an intermediary component between the head controller and the driver IC. This circuit includes a logic power supply input terminal connected to a first voltage input terminal, a logic power supply output terminal connected to a second voltage input terminal, and a diode connecting these terminals. The intermediary circuit ensures stable power supply to the logic circuit even when connection failures occur in the main power supply wiring, thereby resolving the contradiction between reliability and wiring complexity.
2Reliability
If a connection failure exists in the wiring that connects the head controller and the driver IC, then the order of inputting the power supply voltage does not correspond to the predetermined order, but adding a logic power supply circuit increases the device complexity
Solution Approach 1:
The patent implements beforehand cushioning by providing a diode-connected logic power supply circuit that acts as a backup power path. When connection failures occur in the main power supply wiring, this pre-configured circuit ensures that the logic circuit continues to receive power, cushioning against the harmful effects of connection failures without requiring complex real-time monitoring or switching mechanisms.
3Reliability
If the control signal is not in a high level state, then the power supply voltage supplied to the driver IC may not be ensured, but maintaining the power supply voltage requires additional circuit components
Solution Approach 1:
The logic power supply circuit serves as an intermediary that decouples the power supply assurance from the control signal level. The diode-connected circuit ensures that the logic circuit receives stable power supply voltage independent of the control signal state, eliminating the need for additional complex components while maintaining reliable power supply under all operating conditions.
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
This configuration ensures high safety and stability in inkjet head operations by maintaining voltage integrity and preventing through-currents, even in cases of connection failures, thereby enhancing the reliability of the inkjet printer.
Implementation Method 1
a first diode that is provided with an anode connected to a second voltage input to the level shifter and a cathode connected to the power supply input terminal of the logic power supply circuit
Data Source
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AI summary
According to one embodiment, there is provided an inkjet head including a driver IC, a logic power supply circuit, and a first diode. The driver IC includes a logic circuit and a level shifter. The logic power supply circuit inputs a first voltage to a power supply input terminal thereof and supplies a voltage to the logic circuit. The first diode is provided with an anode connected to a second voltage input to the level shifter and a cathode connected to the power supply input terminal of the logic power supply circuit.