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Motor control circuit with interference signal suppression
CN105591576A
China
Description
translated from Chinese
技术领域technical field
本发明涉及一种控制电路，特别是涉及一种具干扰信号抑制的马达控制电路。The invention relates to a control circuit, in particular to a motor control circuit with interference signal suppression.
背景技术Background technique
由于直流(DC)马达在启动运转与关闭停止时，会因为楞次定律(Lenz'slaw)而产生正向及负向的高脉冲的干扰信号，该干扰信号所造成的电压冲击容易经由线路而传递至其电连接的马达控制电路，导致该马达控制电路中的控制信号被误判、运作异常，甚或导致该马达控制电路的内部元件因高压冲击而损坏，不仅造成使用上的不便，也增加了维修成本。Since the direct current (DC) motor will generate positive and negative high-pulse interference signals due to Lenz's law when it starts running and shuts down, the voltage shock caused by the interference signal is easy to pass through the line. The motor control circuit transmitted to its electrical connection will cause the control signal in the motor control circuit to be misjudged, operate abnormally, or even cause the internal components of the motor control circuit to be damaged due to high voltage shock, which not only causes inconvenience in use, but also increases maintenance costs.
为了解决上述问题，如中国台湾发明专利编号第I353700号所示，现有一种具瞬间高电压防护的马达驱动电路通过于马达驱动电路的一个输出检测脚位电连接一个脉冲吸收元件，以降低高压的脉冲信号的影响，然而，现有技术仅于该输出检测脚位提供单向的电压防护，仍然具有进步空间。In order to solve the above problems, as shown in Taiwan Invention Patent No. I353700, there is an existing motor drive circuit with instantaneous high voltage protection that is electrically connected to a pulse absorbing element at an output detection pin of the motor drive circuit to reduce high voltage. However, the existing technology only provides unidirectional voltage protection for the output detection pin, and there is still room for improvement.
发明内容Contents of the invention
本发明的目的在于提供一种具干扰信号抑制的马达控制电路。The object of the present invention is to provide a motor control circuit with interference signal suppression.
本发明的具干扰信号抑制的马达控制电路，适用于电连接一个包括一个信号端及一个电源端的马达模块，该马达控制电路包含一个控制模块。The motor control circuit with interference signal suppression of the present invention is suitable for electrically connecting a motor module including a signal terminal and a power supply terminal, and the motor control circuit includes a control module.
该控制模块包括一个电连接该马达模块的信号端的信号端，及一个电连接该马达模块的电源端的电源端。The control module includes a signal terminal electrically connected to the signal terminal of the motor module, and a power terminal electrically connected to the power terminal of the motor module.
该具干扰信号抑制的马达控制电路还包含一个第一暂态电压抑制元件及一个第二暂态电压抑制元件。The motor control circuit with interference signal suppression also includes a first transient voltage suppression element and a second transient voltage suppression element.
该第一暂态电压抑制元件电连接于该控制模块的信号端与接地端间。The first transient voltage suppression element is electrically connected between the signal terminal and the ground terminal of the control module.
该第二暂态电压抑制元件电连接于该控制模块的电源端与接地端间。The second transient voltage suppression element is electrically connected between the power terminal and the ground terminal of the control module.
本发明所述具干扰信号抑制的马达控制电路，该控制模块经由该信号端传输一个控制信号至该马达模块的信号端，以控制该马达的运作。According to the motor control circuit with interference signal suppression in the present invention, the control module transmits a control signal to the signal terminal of the motor module through the signal terminal to control the operation of the motor.
本发明所述具干扰信号抑制的马达控制电路，该控制模块经由该电源端提供一个输入电源至该马达模块的电源端。According to the motor control circuit with interference signal suppression in the present invention, the control module provides an input power to the power terminal of the motor module through the power terminal.
本发明所述具干扰信号抑制的马达控制电路，该第一暂态电压抑制元件及该第二暂态电压抑制元件皆为双向元件，且分别包括一个正向击穿电压与一个反向击穿电压，所述正向击穿电压的电压值与所述反向击穿电压的电压值的绝对值皆大于该输入电源的电压值。According to the motor control circuit with interference signal suppression in the present invention, the first transient voltage suppression element and the second transient voltage suppression element are both bidirectional elements, and respectively include a forward breakdown voltage and a reverse breakdown voltage Voltage, the absolute value of the voltage value of the forward breakdown voltage and the voltage value of the reverse breakdown voltage is greater than the voltage value of the input power supply.
本发明所述具干扰信号抑制的马达控制电路，还包含一个电连接于该马达模块及该控制模块间的一个开关模块，该开关模块受该控制模块控制以启动运转及关闭停止该马达模块。The motor control circuit with interference signal suppression of the present invention further includes a switch module electrically connected between the motor module and the control module, the switch module is controlled by the control module to start running and shut down the motor module.
本发明的有益效果在于：通过设置双向的该第一暂态电压抑制元件及该第二暂态电压抑制元件，可以同时提供正向及负向的高脉冲的干扰信号到接地端的流通路径，藉此，可以避免该马达控制电路中的控制信号被误判、运作异常，甚或导致该马达控制电路的内部元件因高压而损坏。The beneficial effects of the present invention are: by setting the bidirectional first transient voltage suppression element and the second transient voltage suppression element, it is possible to simultaneously provide positive and negative high-pulse interference signals to the current path of the ground terminal, by Therefore, it is possible to avoid misjudgment of the control signal in the motor control circuit, abnormal operation, or even damage to internal components of the motor control circuit due to high voltage.
附图说明Description of drawings
图1是本发明具干扰信号抑制的马达控制电路的一个实施例的一个示意图；Fig. 1 is a schematic diagram of an embodiment of the motor control circuit with interference signal suppression of the present invention;
图2是一个波形示意图，说明未经干扰信号抑制的一个控制信号；及Figure 2 is a schematic waveform illustrating a control signal without interference signal suppression; and
图3是一个波形示意图，说明该实施例中经干扰信号抑制后的一个控制信号。Fig. 3 is a schematic waveform diagram illustrating a control signal after interference signal suppression in this embodiment.
具体实施方式detailed description
下面结合附图及实施例对本发明进行详细说明：Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:
参阅图1，本发明具干扰信号抑制的马达控制电路的实施例适用于电连接一个包括一个信号端DO及一个电源端VCC的马达模块9，该马达控制电路包含一个控制模块2、一个开关模块3、一个第一暂态电压抑制元件4(TransientVoltageSuppressor，缩写为TVS)，及一个第二暂态电压抑制元件5。Referring to Fig. 1, the embodiment of the motor control circuit with interference signal suppression of the present invention is suitable for electrically connecting a motor module 9 comprising a signal terminal DO and a power supply terminal VCC, the motor control circuit comprises a control module 2, a switch module 3. A first transient voltage suppressor 4 (Transient Voltage Suppressor, TVS for short), and a second transient voltage suppressor 5 .
该开关模块3电连接于该马达模块9及该控制模块2间，并受该控制模块2控制以启动运转及关闭停止该马达模块9。The switch module 3 is electrically connected between the motor module 9 and the control module 2 , and is controlled by the control module 2 to start running and shut down the motor module 9 .
其中，该马达模块9使用直流(DC)的马达实施。Wherein, the motor module 9 is implemented using a direct current (DC) motor.
该控制模块2包括一个电连接该马达模块9的信号端DO的信号端DO，及一个电连接该马达模块9的电源端VCC的电源端VCC。The control module 2 includes a signal terminal DO electrically connected to the signal terminal DO of the motor module 9 , and a power terminal VCC electrically connected to the power terminal VCC of the motor module 9 .
该控制模块2经由该信号端DO传输一个控制信号至该马达模块9的信号端DO，以控制该马达模块9的运作；该控制模块2经由该电源端VCC提供一个输入电源至该马达模块9的电源端VCC。The control module 2 transmits a control signal to the signal terminal DO of the motor module 9 via the signal terminal DO to control the operation of the motor module 9; the control module 2 provides an input power supply to the motor module 9 via the power supply terminal VCC The power supply terminal VCC.
该第一暂态电压抑制元件4电连接于该控制模块2的信号端DO与接地端间。The first transient voltage suppression element 4 is electrically connected between the signal terminal DO and the ground terminal of the control module 2 .
该第二暂态电压抑制元件5电连接于该控制模块2的电源端VCC与接地端间。The second transient voltage suppression element 5 is electrically connected between the power terminal VCC and the ground terminal of the control module 2 .
其中，该第一暂态电压抑制元件4及该第二暂态电压抑制元件5皆为双向元件，且分别包括一个正向击穿电压(breakdownvoltage)与一个反向击穿电压，所述正向击穿电压的电压值与所述反向击穿电压的电压值的绝对值皆大于该输入电源的电压值。Wherein, the first transient voltage suppression element 4 and the second transient voltage suppression element 5 are both bidirectional elements, and respectively include a forward breakdown voltage (breakdown voltage) and a reverse breakdown voltage, the forward Both the voltage value of the breakdown voltage and the voltage value of the reverse breakdown voltage are greater than the voltage value of the input power supply.
一般使用时，由于该控制模块2与该马达模块9间具有传输信号(信号端DO至信号端DO)及电源(电源端VCC至电源端VCC)的两条连接线路，因此，在该马达模块9受该开关模块3启动运转与关闭停止时，因为楞次定律(Lenz'slaw)所产生的正向及负向的高脉冲的干扰信号所造成的电压冲击容易经由上述的两条连接线路而传递至其该控制模块2，若未进行干扰信号抑制，则该高脉冲的干扰信号将会导致该马达控制电路的控制信号被误判、运作异常，甚或使该马达控制电路的内部元件(例如：霍尔元件、半导体元件等)因高压而损坏。In general use, since the control module 2 and the motor module 9 have two connection lines for transmitting signals (signal terminal DO to signal terminal DO) and power supply (power supply terminal VCC to power supply terminal VCC), therefore, in the motor module 9. When the switch module 3 starts running and shuts down, the voltage shock caused by the positive and negative high-pulse interference signals generated by Lenz's law is easy to pass through the above two connecting lines. If the interference signal is not suppressed, the high-pulse interference signal will cause the control signal of the motor control circuit to be misjudged, operate abnormally, or even cause the internal components of the motor control circuit (such as : Hall elements, semiconductor elements, etc.) are damaged by high voltage.
因此，通过设置双向的该第一暂态电压抑制元件4及该第二暂态电压抑制元件5，可以在正向的干扰信号大于所述正向击穿电压(或该负向的干扰信号的绝对值大于所述负向击穿电压的绝对值)时，通过该第一暂态电压抑制元件4(或该第二暂态电压抑制元件5)产生击穿，使其自身的工作阻抗降至极低的导通值，进而使该高脉冲的干扰信号可以经由该第一暂态电压抑制元件4(或该第二暂态电压抑制元件5)流通到接地端，此时该第一暂态电压抑制元件4(或该第二暂态电压抑制元件5)维持在一个预定的钳制电压值，藉此，可以同时提供正向及负向的高脉冲的干扰信号到接地端的流通路径，而能避免高脉冲的干扰信号导致该马达控制电路的控制信号被误判、运作异常，及保护该马达控制电路的内部元件。Therefore, by arranging the bidirectional first transient voltage suppression element 4 and the second transient voltage suppression element 5, the interference signal in the forward direction can be greater than the breakdown voltage in the forward direction (or the interference signal in the negative direction) When the absolute value is greater than the absolute value of the negative breakdown voltage), a breakdown occurs through the first transient voltage suppression element 4 (or the second transient voltage suppression element 5), so that its own working impedance is reduced to extremely low conduction value, so that the high-pulse interference signal can flow through the first transient voltage suppression element 4 (or the second transient voltage suppression element 5) to the ground terminal, at this time the first transient voltage The voltage suppression element 4 (or the second transient voltage suppression element 5) is maintained at a predetermined clamping voltage value, whereby positive and negative high-pulse interference signals can be provided to the current path of the ground terminal at the same time, thereby enabling Prevent the high-pulse interference signal from causing the control signal of the motor control circuit to be misjudged and operate abnormally, and protect the internal components of the motor control circuit.
再者，该第一暂态电压抑制元件4及该第二暂态电压抑制元件5能承受高压的时间较一般常见的齐纳二极管(Zenerdiode)长，齐纳二极管一般能承受高压时间为ns等级，而该第一暂态电压抑制元件4及该第二暂态电压抑制元件5则能到达us或ms等级，因此，该第一暂态电压抑制元件4及该第二暂态电压抑制元件5具有能承受波宽较大的干扰信号及反应时间快的优点，所以能更好地将高脉冲的干扰信号导通到接地端，而能更加避免干扰该控制信号及损坏元件，所以具有较佳的干扰信号抑制效果。Furthermore, the time that the first transient voltage suppression element 4 and the second transient voltage suppression element 5 can withstand high voltage is longer than that of a common Zener diode (Zenerdiode), and the Zener diode can generally withstand high voltage for a time of ns level , and the first transient voltage suppression element 4 and the second transient voltage suppression element 5 can reach us or ms level, therefore, the first transient voltage suppression element 4 and the second transient voltage suppression element 5 It has the advantages of being able to withstand interference signals with large wave width and fast response time, so it can better conduct high-pulse interference signals to the ground terminal, and can avoid interference with the control signal and damage components, so it has better interference signal suppression effect.
参阅图2及图3，图2中标示A的波形为未经干扰信号抑制的控制信号，图3中标示A的波形为本实施例经干扰信号抑制后的控制信号，由图2中可见该干扰信号所造成的峰值电压(peaktopeakvoltage)高达35V，时间长达4.8ms，而图3中经干扰信号抑制后，峰值电压大幅降低至11.6V，时间也缩短为3.2ms，显见本实施例具有极佳的干扰信号抑制效果。Referring to Fig. 2 and Fig. 3, the waveform marked A in Fig. 2 is the control signal without interference signal suppression, and the waveform marked A in Fig. 3 is the control signal after interference signal suppression in this embodiment, as seen in Fig. 2 The peak voltage (peaktop peak voltage) caused by the interference signal is as high as 35V, and the time is as long as 4.8ms. However, after the interference signal is suppressed in Fig. 3, the peak voltage is greatly reduced to 11.6V, and the time is also shortened to 3.2ms. Excellent interference signal suppression effect.
综上所述，所以确实能达成本发明的目的。To sum up, so can really reach the purpose of the present invention.
以上所述者，仅为本发明的实施例而已，当不能以此限定本发明实施的范围，即凡依本发明权利要求书及说明书内容所作的简单的等效变化与修饰，皆仍属本发明的范围。The above is only an embodiment of the present invention, and should not limit the scope of the present invention with this, that is, all simple equivalent changes and modifications made according to the claims of the present invention and the contents of the description are still within the scope of this invention. the scope of the invention.