Texas Instruments washing machine: low-end solution

Due to the lack of product functionality, the basic design of traditional washing machines has not changed substantially over the years. In addition to providing the traditional 5V analog and logic commodity devices used, Texas Instruments offers feature-rich products that integrate relay drivers, zero-voltage detection, brownout detection, and the ability to BoM (materials) Checklist) 5V linear regulator with cost keeping within budget.

Washing machine circuit

5V logic and simulation:

Texas Instruments offers the largest product range in commodity space, giving designers the flexibility to choose from all the logic functions they need. TI can provide both the AND gate and the unit buffer required on the board. TI also offers a wide selection of standard linear devices for regulation (linear regulators), relays (relay drivers), signal conditioning (op amps), etc., which are available over the industrial temperature range.

integrated:

Texas Instruments offers fully integrated solutions such as digital signal controllers for digital motor control, PFC and other system functions, and relay drivers that provide up to 8 channels, zero voltage detection and 5V linear stability Pressure. In addition to the usual 7-bit relay drivers (such as the ULN2003A Darlington array), TI also offers 8-bit TPL9201 or TPL9202 relays for water and drain valves and three-terminal bidirectional for turning the motor on/off. Silicon controlled switching components. These devices also have an integrated feature that allows zero voltage cross-checking of the secondary side of the power converter. The information is fed back to the microcontroller, letting it know when to turn the relay on/off to achieve better long-term reliability of the relay itself. The TPL9202 has a power-down detection function that can be notified in advance to prevent the Power Supply voltage from dropping. These devices also feature an on-chip 5V linear regulator that supplies power to the 5V logic or microcontroller residing on the board.

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