San Ace PWM
It can reduce the device’s power consumption and noise levels. If equipped with a PWM pulse generator, the PWM circuit will need to be redesigned. If you use this product, you won’t need to redesign the circuit and can still use fans with PWM pulse generation functionality. The fan speed can be easily controlled, thereby reducing the device’s power consumption and noise levels.
Category:
PWM Controller
Product description
San Ace PWM Pulse Generator
Can reduce device power consumption and noise.
If equipped with a PWM pulse generator, the PWM circuit will need to be redesigned.
If you use this product, you won’t need to redesign the circuit and can still use fans equipped with PWM pulse generator functionality.
The fan speed can be easily controlled, thereby reducing the device’s power consumption and noise level.
Power supply and fan are universal.
Can share a power supply with fans rated at 12V/24V/48V.
Up to 4 fans can be connected.
Up to 4 fans equipped with PWM pulse generator functionality can be connected and used together.
※The PWM pulse generator function refers to the capability of controlling fan speed by varying the duty cycle (pulse width) of the pulse signal. Our company’s fans also make extensive use of this feature.
Specifications
BOX type | Substrate type | |
Dimensions [mm] | 66 (W) × 86 (H) × 38 (D) | 45 (W) × 80 (H) × 17 (D) |
Rated Voltage [V] | 12 / 24 / 48 | |
Power consumption [W] | 0.2 | |
Operating Voltage Range [V] | 7 to 60 | |
Operating temperature range [℃] | -20 to +70 | |
Output PWM signal | VOH: Selectable 3.3V/5V, Frequency: 25kHz | |
Number of connectable fans | Up to 4 units | |
Installation method | DIN rail or screw mounting | Screw fastening |
Quality [g] | 110 | 27 |
Material | Shell: Resin | Substrate: FR-4 |
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The PWM generator module implements a PWM generator. Pulse Width Modulation (PWM) technology controls power transfer from one electrical component to another by rapidly switching between full-power transmission and zero-power transmission.
The PWM generator module outputs a 1 when the duty cycle is greater than the value of the carrier counter; otherwise, it outputs a 0. You can set the period of each cycle using the timer period Tper. You can change the initial output or phase of the PWM output by selecting one of three types of carrier counters:
Rising counter — The PWM output signal is initialized to on at the beginning of the period.
Decrement counter — The PWM output signal is initialized to off at the beginning of the period.
Up-and-down counter — The PWM output signal is initialized to on midway through the period.
This circuit uses a triangular-wave generator and a comparator to produce a pulse-width modulation (PWM) waveform whose duty cycle is inversely proportional to the input voltage. An operational amplifier and a comparator generate the triangular waveform, which is then fed to the inverting input of the next comparator.
A PWM waveform can be generated by feeding the input voltage to the non-inverting input of a comparator. Negative feedback from the PWM waveform to the error amplifier ensures high accuracy and linearity of the output.
TI designs are analog solutions created by TI’s analog experts. These validated designs provide theoretical background, component selection guidelines, simulation results, complete PCB schematics and layouts, bill-of-materials, and measured performance data for useful circuits. They also discuss circuit modifications that can help achieve alternative design objectives.
1. The principle of the PWM pulse generator
1.1 Basic Principles
A PWM pulse generator adjusts the average voltage of the output signal by varying the pulse width. A PWM signal consists of a series of pulses, each with a specific frequency and duty cycle. The duty cycle refers to the ratio of the pulse's high-level duration to the total period. By adjusting the duty cycle, it is possible to precisely control the output signal.
1.2 Duty Cycle Adjustment
For example, in a PWM signal with a period of 20 milliseconds, if the high-level duration is 10 milliseconds, the duty cycle is 50%.
1.3 Waveform of the PWM signal
The waveform of a PWM signal has the following characteristics:
Constant frequency: The frequency of the PWM signal typically remains constant, and the output is adjusted by varying the duty cycle.
Variable width: The width of the high-level signal is variable, and the width of the low-level signal changes accordingly, thereby achieving different duty cycles.
2. Structure of the PWM Pulse Generator
2.1 Basic Components
The basic components of a PWM pulse generator include:
Clock source: Provides a stable clock signal used as the reference frequency for generating PWM signals.
Counter: Used to count clock pulses, determining the period and frequency of the PWM signal.
Comparator: Compares the counter’s output with a preset duty cycle value to determine the high-to-low level transitions of the PWM signal.
Control circuit: Used to set the duty cycle and frequency, and to perform signal processing and output.
2.2 Typical Circuit Design
A typical PWM pulse generator circuit design includes:
555 Timer Circuit: Use a 555 timer as a PWM signal generator, and adjust the duty cycle by modifying the external resistors and capacitors.
Microcontroller: Uses the microcontroller’s timer module to generate PWM signals, offering flexible programmable control capabilities.
Dedicated PWM chips—such as the TL494 and SG3525—are specialized integrated circuits that combine PWM signal generation and control functions, making them ideal for power management and motor control applications.
3. Applications of the PWM Pulse Generator
3.1 Motor Control
PWM pulse generators are widely used in the control of DC motors and brushless motors. By adjusting the duty cycle of the PWM signal, it is possible to control the motor’s speed and torque. PWM control offers the advantage of rapid response and is well-suited for applications in industrial automation, robotics, household appliances, and other fields.
3.2 Lighting Adjustment
PWM technology is used for brightness adjustment in LED lighting. By modulating the duty cycle, it enables linear control of LED brightness. PWM dimming features low power consumption, flicker-free operation, and a wide dimming range, making it widely adopted in smart lighting systems and stage lighting control.
3.3 Power Management
The PWM pulse generator is used in switching power supplies to control the switching frequency and duty cycle of the power converter, thereby achieving stable regulation of the output voltage and current. PWM technology plays a crucial role in power management systems such as DC-DC converters, inverters, and chargers.
3.4 Audio Signal Processing
PWM technology is used for the modulation and demodulation of digital audio signals. By filtering and amplifying the PWM signal, high-fidelity audio output can be achieved. PWM audio amplifiers offer advantages such as high efficiency, low distortion, and excellent sound quality, making them widely used in audio systems and portable electronic devices.
Contact Us
Capital Technology Co., Limited
Tel: 0755-27087416 / 18316996909
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E-mail: sales@szcpt.com
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