Circuit structure for frequency reduction in speed control switch
A circuit structure, speed-adjusting switch technology, applied in the direction of adjusting electrical variables, electrical components, control/regulating systems, etc., can solve problems such as user inconvenience, increased audio noise, low operating frequency, etc., to reduce audio noise interference and ensure work. Efficiency, loss reduction effect
Active Publication Date: 2016-12-14
绍兴光大芯业微电子有限公司
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Problems solved by technology
Although the lower operating frequency reduces the switching loss of M1 and improves the overall efficiency of the system, but due to the lower operating frequency, which is within the human audio range, it increases the audio noise and brings inconvenience to the user
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[0027] In order to describe the technical content of the present invention more clearly, further description will be given below in conjunction with specific embodiments.
[0028] The circuit structure for realizing frequency reduction in the speed control switch of the present invention is as follows: figure 2 shown.
[0029] S1 is the voltage input signal, which is input to the VARF module. The VARF module is a frequency selection module. After the S1 signal is detected by the VARF module, the VARF module outputs the frequency selection signal S2 and inputs it to the OSC module. The OSC module is an oscillator, and its function is to generate a digital clock signal S3 and a triangular wave signal S4 with the same frequency. The S3 signal is used as the clock signal of the system. The S4 signal is input to the PWM unit and compared with the S1 signal. The PWM unit is a pulse width modulation unit, which compares the S1 signal with the S4 signal to determine the duty cyc...
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The invention relates to a circuit structure for achieving underclocking in a speed-regulating switch. The circuit structure for achieving underclocking in the speed-regulating switch comprises a frequency selection module and a pulse width modulation signal control module, wherein the frequency selection module is used for outputting system preset low-level frequency selection signals when initial input signals are lower than a system preset input limiting value and outputting system preset high-level frequency selection signals when the initial input signals are higher than the system preset input limiting value, when the frequency selection signals are of system preset low level, the pulse width modulation signal control module outputs system preset high-frequency pulse driving signals, and when the frequency selection signals are of system preset high level, the pulse width modulation signal control module outputs system preset low-frequency pulse driving signals. The circuit structure for achieving underclocking in the speed-regulating switch adopts a high-frequency driving method in a low-current driving working mode, and reduces voice frequency noise interference generated when a motor works. The circuit structure for achieving underclocking in the speed-regulating switch adopts a low-frequency driving method in a large-current driving working mode, guarantees the working efficiency of the motor, reduces loss of a power tube, and has a wider application range.
Description
technical field [0001] The invention relates to the field of integrated circuits, in particular to the field of PWM drive speed regulation, and specifically refers to a circuit structure for realizing frequency reduction in a speed regulation switch. Background technique [0002] The application of DC motors has been widely used by the end of the 19th century. Although with the gradual popularization of AC application systems, the application of DC motors has a downward trend, but DC motors themselves have the advantages of good linear speed regulation and simple and easy control, making them irreplaceable in industrial applications. Compared with AC motors, DC motors mainly have the following characteristics: (1) wider speed range; (2) faster dynamic response process; (3) automatic and smooth transition process during acceleration and deceleration; (4) ) can provide larger torque when running at low speed. DC motors are widely used in various fields such as CNC machine to...
Claims
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IPC IPC(8): H02M3/156H02P7/29
Inventor 田剑彪章少杰胡俊材王庆斌顾川胡建伟何迟
Owner 绍兴光大芯业微电子有限公司