What is the Difference Between Transmission Voltage and External Trigger Voltage in an Ultrasonic Pulse Generator/Receiver?

I. Meaning of Transmission Voltage

Definition: Refers to the adjustable range of output voltage when the pulse generator/receiver emits a pulse signal. For example, the transmission voltage range of YUSHI PR10 Ultrasonic Pulse Generator/Receiver is 60 V to 200 V.

Practical Significance:

Signal Strength Control: Higher transmission voltage results in stronger pulse signal energy and longer transmission distance (e.g., in ultrasonic testing, radar, or communication scenarios). However, excessively high voltage may increase power consumption or potentially damage the load (e.g., the transducer).

Application Scenario Adaptation: Different scenarios require signals of varying strengths. For instance, industrial inspection might need high voltage (e.g., 200 V) to penetrate media, while short-range communication might use low voltage (e.g., 60 V) to reduce energy consumption.

II. Meaning of External Trigger Voltage

Definition: Refers to the required power supply voltage level for the device when it receives an external trigger signal. For example, the external trigger voltage for YUSHI PR10 model Ultrasonic Pulse Generator/Receiver is 3.3 V.

Practical Significance:

Trigger Signal Level Standard: 3.3 V is a common low-voltage standard in digital circuits (e.g., TTL/CMOS level standards). It is used by external controllers (e.g., MCU, FPGA) to send trigger signals (e.g., a rising edge or high level) to the pulse generator/receiver to initiate transmission or reception operations.

Compatibility Design: Adapts to the output levels of mainstream digital chips, ensuring the external trigger signal can be reliably recognized by the device (e.g., the device is triggered to operate when an external device outputs a 3.3 V high level).

III. Core Differences Between the Two

IV. Relationship Between the Two

Control Relationship:

The external trigger voltage (3.3 V signal) is the "control input". The device outputs a pulse signal according to the set transmission voltage range (60 V - 200 V) only when it receives a trigger signal that meets the 3.3 V level standard.

Example: External MCU outputs a 3.3 V high-level trigger signal → Pulse generator/receiver is activated → Emits a pulse at a set voltage (e.g., 100 V).

System Compatibility Design:

The level of the transmission voltage does not affect the level standard of the trigger voltage.

However, the 3.3 V trigger voltage must match the input impedance and threshold voltage of the device's internal trigger circuit to ensure the trigger signal can effectively initiate the generation of the transmission voltage.

Power Consumption and Safety Balance:

Higher transmission voltage results in greater device power consumption.

Using a low voltage (3.3 V) for the trigger supply reduces control circuit power consumption.

It also prevents high-voltage interference with the trigger signal circuitry, ensuring system stability.

V. Application Example (Ultrasonic Ranging)

Transmission Voltage (e.g., 100 V): Used to drive the ultrasonic transducer to emit high-intensity sound waves that penetrate air or other media.

External Trigger Voltage (3.3 V): A 3.3 V pulse signal output by a microcontroller (like Arduino) triggers the transducer to emit sound waves and simultaneously starts the timing function to implement the ranging logic.

Through the distinctions outlined above, it is clear that these two voltages serve different purposes: "Signal Energy Output" and "Device Operation Control", respectively. Together, they constitute the complete workflow of the pulse generator/receiver.