TWI595750B - Two-way Trigger Type Piezo Device - Google Patents

Description

Two-wire trigger signal piezoelectric device

The present invention relates to a piezoelectric element, and more particularly to a piezoelectric element that generates a forward trigger signal and a negative trigger signal to provide a rear stage controller for use.

It is known that one or more switches are installed on an existing machine or controller to act as a power start switch of the machine or controller or to generate control signals to control other machines to start operation. The conventional switch structure generally has a base, and a plurality of conductive pins, moving blocks (rods), springs (or rubber) and a cover body are assembled inside the base. After the cover body is pressed, the moving block is moved to compress the spring, so that the metal piece on the moving block or another piece of metal piece is pressed into contact with the conductive pins, so that the power source is turned on or a control signal output is generated. Achieve the start of the machine or controller.

Since the above-mentioned switch structure belongs to the mechanical structure design, under the frequent use of the pressing condition, the internal spring or the rubber is elastically fatigued, or the moving block is worn, which causes a problem of mechanical failure, and the cover of the switch structure cannot be connected after being pressed. The power supply or the generation of the control signal output also makes the mechanically designed switch structure have a short service life.

In recent years, in order to improve the mechanical failure factors of traditional mechanical switch structures, most of them currently replace the traditional mechanical switch structures with piezoelectric switches. Since the piezoelectric open relationship is a power generating material, a positive signal is generated when the piezoelectric switch is pressed and a negative signal is generated when the piezoelectric switch is released, and most of the control design uses a forward signal. As a control signal, as for the negative signal, the negative signal is excluded by a diode element, but when the forward signal is used as a trigger for the controller or other device, many control problems often occur, resulting in design. Troubled.

Accordingly, the main object of the present invention is to solve the conventional deficiencies, and the present invention proposes a simple circuit design in which a positive signal generated by pressing the piezoelectric element is used as a trigger signal of an external controller, and the piezoelectric element is used. The negative signal generated by the release after pressing is converted into another forward signal by the simple circuit, and the external controller can also be used as another trigger signal to solve the traditional use of only one single forward signal for trigger control. The problem that exists.

To achieve the above objective, the present invention provides a two-wire trigger signal piezoelectric device comprising: a piezoelectric element, a rectifying unit, a forward trigger end and a negative trigger end. The piezoelectric element outputs a voltage that generates a forward signal and a negative signal. The rectifying unit is electrically connected to the piezoelectric element. The forward trigger terminal is electrically connected to the rectifying unit. The negative trigger terminal is electrically connected to the rectifying unit. After the piezoelectric element is pressed, a voltage of a forward signal is generated to the forward trigger end; after the piezoelectric element is pressed, the voltage of the generated negative signal is converted into another by the rectifying unit. The voltage of the forward signal is on the negative trigger terminal.

In an embodiment of the present invention, a filtering unit is further included, the filtering unit is electrically connected between the piezoelectric element and the rectifying unit, and the filtering unit is a capacitor.

In an embodiment of the present invention, the rectifying unit is a full wave rectifying unit or a half wave rectifying unit.

In an embodiment of the present invention, a first protection unit and a second protection unit are further included, the first protection unit is electrically connected between the rectification unit and the forward trigger end; the second protection unit is Electrically coupled between the rectifying unit and the negative trigger terminal.

In an embodiment of the present invention, the first protection unit and the second protection unit are an instance diode.

In the embodiment of the present invention, a first resistor and a first switch unit are electrically connected to the input end of the first protection unit, and the first switch unit includes a first transistor and a third resistor. The first protection unit is electrically connected between the gate and the source of the first transistor, and the source of the first transistor is grounded, and one end of the third resistor and the drain of the first transistor The other end of the third resistor is electrically connected to the circuit power supply, and the electrical connection between one end of the third resistor and the drain of the first transistor is coupled to the forward trigger terminal.

In the embodiment of the present invention, a second resistor and a second switch unit are electrically connected to the input end of the second protection unit, and the second switch unit includes a second transistor and a fourth resistor. The second protection unit is electrically connected between the gate and the source of the second transistor, the source of the second transistor is grounded, and one end of the fourth resistor and the drain of the second transistor The other end of the fourth resistor is electrically connected to the circuit power supply, and one end of the fourth resistor is coupled to the negative polarity trigger end of the second transistor.

To achieve the above object, the present invention further provides a piezoelectric device with a two-wire trigger signal, comprising: a piezoelectric element, a forward limiting unit, a bridge rectifier unit, a forward trigger end and a negative trigger end. . The piezoelectric element outputs a voltage that generates a forward signal and a negative signal. The forward limiting unit is electrically coupled to the piezoelectric element. The bridge rectifier unit is electrically coupled to the forward limiting unit. The forward trigger terminal is electrically connected to the rectifying unit. The negative trigger terminal is electrically connected to the rectifying unit. After the piezoelectric element is pressed, a voltage of a forward signal is generated to the forward trigger end; after the piezoelectric element is pressed, the voltage of the generated negative signal is converted into a bridge rectifier unit. The voltage of the other forward signal is on the negative trigger terminal.

In an embodiment of the present invention, a filtering unit is further included, the filtering unit is electrically connected between the piezoelectric element and the forward limiting unit, and the filtering unit is a capacitor.

In an embodiment of the present invention, the forward limiting unit is a diode.

In an embodiment of the present invention, a first protection unit and a second protection unit are further included, the first protection unit is electrically connected between the bridge rectifier unit and the forward trigger end; the second protection The unit is electrically connected between the bridge rectifier unit and the negative trigger terminal.

In an embodiment of the present invention, the first protection unit and the second protection unit are an instance diode.

In the embodiment of the present invention, a first resistor and a first switch unit are electrically connected to the input end of the first protection unit, and the first switch unit includes a first transistor and a third resistor. The first protection unit is electrically connected between the gate and the source of the first transistor, and the source of the first transistor is grounded, and one end of the third resistor and the drain of the first transistor The other end of the third resistor is electrically connected to the circuit power supply, and the electrical connection between one end of the third resistor and the drain of the first transistor is coupled to the forward trigger terminal.

In the embodiment of the present invention, a second resistor and a second switch unit are electrically connected to the input end of the second protection unit, and the second switch unit includes a second transistor and a fourth resistor. The second protection unit is electrically connected between the gate and the source of the second transistor, the source of the second transistor is grounded, and one end of the fourth resistor and the drain of the second transistor The other end of the fourth resistor is electrically connected to the circuit power supply, and one end of the fourth resistor is coupled to the negative polarity trigger end of the second transistor.

The technical content and detailed description of the present invention are now described as follows:

Please refer to FIG. 1 and FIG. 2, which are circuit blocks and circuit diagrams of a piezoelectric device of a two-wire trigger signal according to a first embodiment of the present invention. As shown in the figure, the piezoelectric device 100 of the two-wire trigger signal of the present invention comprises: a piezoelectric element (Piezo Element) 10, a filtering unit 20, a rectifying unit 30, a first protection unit 40, and a first Second protection unit 50. Wherein, the piezoelectric element 10 generates a forward signal 101 and a negative signal 102, and the rectifying unit 30 converts the negative signal 102 into another forward signal 101', so that the piezoelectric device 100 outputs a positive direction. The trigger signal and the negative trigger signal are applied to the positive trigger 200 and the negative trigger 300 for use by a controller (not shown) electrically connected to the subsequent stage.

The piezoelectric element 10 is made of a power generating material, and after the piezoelectric element 10 is pressed, a forward signal 101 is output. After the piezoelectric element 10 is pressed, it is released to generate a negative direction signal 102 output.

The filtering unit 20 is electrically connected to the piezoelectric element 10 to filter out the noise entrained in the forward signal 101 and the negative signal 102. In the figure, the filtering unit 10 is a capacitor.

The rectifying unit 30 is electrically coupled to the filtering unit 20, and converts the negative signal 102 output from the piezoelectric element 10 into another forward signal 101'. In the figure, the rectifying unit 30 is a full-wave rectifying circuit, a half-wave rectifying circuit or a bridge rectifying circuit.

The first protection unit (D6) 40 is electrically connected to the rectifying unit 30, and the voltage of the forward signal 101 generated after the piezoelectric element 10 is pressed is greater than the voltage of the first protection unit 40 (reverse direction) At the time of the breakdown voltage or the sense voltage, the voltage flowing to the forward trigger terminal 200 is regarded as the self voltage of the first protection unit (D7) 40 to prevent excessive voltage from being output to the external controller. In the figure, the first protection unit 40 is a Zener diode, and the self-voltage of the arrester diode is 3V-100V.

The second protection unit 50 is electrically connected to the rectifying unit 30. When the piezoelectric element 10 is pressed and then released, the voltage of the generated negative signal 102 is converted into another positive through the rectifying unit 30. After the voltage of the signal 101', the voltage of the converted forward signal 101' is greater than the voltage of the second protection unit 50 (reverse breakdown voltage or the sense voltage), the voltage flowing to the negative trigger terminal 300 It is regarded as the self voltage of the second protection unit 50 to avoid excessive voltage output to the external controller. In the figure, the first protection unit 40 is an arrester diode.

In the operation of the present invention, the forward trigger terminal 200 and the negative trigger terminal 300 of the piezoelectric device of the present invention are connected to an external controller (not shown). When the piezoelectric element 10 is pressed, the piezoelectric element 10 generates a forward signal 101, and the voltage of the forward signal 101 passes through the filtering unit 20 to the first protection unit 40, and the voltage is not greater than the first protection. When the voltage of the unit 40 is self-voltage, the voltage of the forward signal 101 is directly output to the forward trigger terminal 200 to provide the controller for use. At the same time, the forward signal 101 is reflowed to the piezoelectric element 10 via the diode of the rectifying unit 30 via the voltage of the first protection unit 40.

When the voltage of the forward signal 101 is greater than the voltage of the first protection unit 40 (reverse breakdown voltage or the sense voltage), the voltage flowing to the forward trigger terminal 200 is regarded as the voltage of the first protection unit 40. To avoid excessive voltage output to the external controller.

When the piezoelectric element 10 is pressed and released, the piezoelectric element 10 generates a negative signal 102, and the voltage of the negative signal 102 is converted to another by the filtering unit 20 and the diode D2 of the rectifying unit 30. When the signal 101' is forward, the voltage of the other forward signal 101' will flow to the second protection unit 50. When the voltage is not greater than the voltage of the second protection unit 50, the other forward signal 101' The voltage is directly output to the negative trigger terminal 300 to provide for use by the controller.

When the voltage of the converted forward signal 101' is greater than the voltage of the second protection unit 50 (reverse breakdown voltage or the sense voltage), the voltage flowing to the negative trigger terminal 300 is regarded as the second protection unit. 50 own voltage to avoid excessive voltage output to the external controller. In the figure, the first protection unit 40 is an arrester diode.

Please refer to FIGS. 3 and 4, which are circuit blocks and circuit diagrams of a piezoelectric device of a two-wire trigger signal according to a second embodiment of the present invention. As shown in the figure, this embodiment is substantially the same as the circuit of the first embodiment, except that a first resistor (R1) 90 and a first switch are electrically connected to the input end of the first protection unit 40. The first switching unit 60 includes a first transistor (Q1) 601 and a third resistor (R3) 602. The first protection unit 40 is electrically connected between the gate and the source of the first transistor 601, and the source of the first transistor 601 is grounded. One end of the third resistor 602 is electrically connected to a drain of the first transistor 601, and the other end of the third resistor 602 is electrically connected to the circuit power source Vcc. An electrical connection between one end of the third resistor 602 and the drain of the first transistor 601 is coupled to the forward trigger terminal 200. In the figure, the first transistor 601 is a metal oxide semiconductor field effect transistor (MOSFET).

In addition, a second resistor (R2) 90' and a second switch unit 70 are electrically connected to the input end of the second protection unit 50. The second switch unit 70 includes a second transistor (Q2) 701 and A fourth resistor (R4) 702. The second protection unit 50 is electrically connected between the gate and the source of the second transistor 701, and the source of the second transistor 701 is grounded. One end of the fourth resistor 702 is electrically connected to a drain of the second transistor 701, and the other end of the fourth resistor 702 is electrically connected to the circuit power source Vcc. One end of the fourth resistor 702 is electrically connected to the negative polarity trigger end 300 of the second transistor 701. In the figure, the second transistor 701 is a metal oxide semiconductor field effect transistor (MOSFET).

When the piezoelectric element 10 is not pressed, the first transistor 601 and the second transistor 701 of the first switching unit 60 are not turned on, so that the voltage of the forward trigger terminal 200 and the negative trigger terminal 300 For the circuit power supply Vcc.

When the piezoelectric element 10 is pressed, the generated forward signal 101 flows to the first transistor 601 of the first switching unit 60 to be turned on, so that the circuit power source Vcc flows through the first transistor 601 to the ground. The output voltage of the forward trigger terminal 200 is made zero.

After the piezoelectric element 10 is pressed and released, the generated negative signal 102 is converted into another forward signal 101' by the rectifying unit 30, and the other forward signal 101' makes the second switching unit The second transistor 701 of 70 is turned on, so that the circuit power source Vcc flows through the second transistor 701 to the ground, so that the output voltage of the negative trigger terminal 300 is zero.

The above two trigger signals are used to provide an external controller or other electronic device for startup or other control.

Please refer to FIG. 5, which is a circuit diagram of a piezoelectric device of a two-wire trigger signal according to a third embodiment of the present invention. As shown in the figure, this embodiment is substantially the same as the first embodiment, except that the rectifying unit 30 is a bridge rectifying unit 30a, and is electrically connected between the bridge rectifying unit 30a and the filtering unit. The forward limiting unit 80, the forward limiting unit 80, limits the passage of the forward signal 101. After the piezoelectric element 10 is pressed and released, the generated negative signal 102 is converted into another forward signal 101' to the negative trigger terminal 300 to provide an external controller or other electronic device. Used as a start or other control. In the figure, the forward limiting unit 80 is a diode.

Please refer to FIG. 6, which is a circuit diagram of a piezoelectric device of a two-wire trigger signal according to a fourth embodiment of the present invention. As shown in the figure, this embodiment is substantially the same as the second embodiment, except that the rectifying unit 30 is a bridge rectifying unit 30a, and is electrically connected between the bridge rectifying unit 30a and the filtering unit. The forward limiting unit 80, the forward limiting unit 80, limits the passage of the forward signal 101. After the piezoelectric element 10 is pressed and released, the generated negative signal 102 is converted into another forward signal 101' to the negative trigger terminal 300 to provide an external controller or other electronic device. Used as a start or other control.

However, the above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalents thereof are all included in the scope of the present invention. Within the scope of protection, it is given to Chen Ming.

100‧‧‧ Piezoelectric device

10‧‧‧Piezoelectric components

101, 101'‧‧‧ positive signal

102‧‧‧negative signal

20‧‧‧Filter unit

30‧‧‧Rectifier unit

30a‧‧‧Bridge rectifier unit

40‧‧‧First Protection Unit

50‧‧‧Second protection unit

200‧‧‧ forward trigger

300‧‧‧negative trigger

60‧‧‧First switch unit

601‧‧‧First transistor

602‧‧‧ Third resistor

70‧‧‧Second switch unit

701‧‧‧Second transistor

702‧‧‧fourth resistor

80‧‧‧ forward limit unit

90‧‧‧First resistor

90'‧‧‧second resistor

1 is a circuit block diagram of a piezoelectric device of a two-wire trigger signal according to a first embodiment of the present invention;

2 is a circuit diagram of a piezoelectric device of a two-wire trigger signal according to a first embodiment of the present invention;

3 is a circuit block diagram of a piezoelectric device of a two-wire trigger signal according to a second embodiment of the present invention;

4 is a circuit diagram of a piezoelectric device of a two-wire trigger signal according to a second embodiment of the present invention;

5 is a circuit diagram of a piezoelectric device of a two-wire trigger signal according to a third embodiment of the present invention;

Figure 6 is a circuit diagram showing the piezoelectric device of the two-wire trigger signal of the fourth embodiment of the present invention.

100‧‧‧ Piezoelectric device

10‧‧‧Piezoelectric components

101, 101’‧‧‧ positive signal

102‧‧‧negative signal

20‧‧‧Filter unit

30‧‧‧Rectifier unit

40‧‧‧First Protection Unit

50‧‧‧Second protection unit

200‧‧‧ forward trigger

300‧‧‧negative trigger

Claims (13)

A piezoelectric device for a two-wire trigger signal, comprising: a piezoelectric element for generating a voltage output of a forward signal and a negative signal; a rectifying unit electrically connected to the piezoelectric element; and a filtering unit Electrically coupled between the piezoelectric element and the rectifying unit; a forward triggering end electrically coupled to the rectifying unit; a negative triggering end electrically coupled to the rectifying unit; a first protection unit Electrically coupled between the rectifying unit and the forward triggering end; and a second protective unit electrically coupled between the rectifying unit and the negative triggering end; wherein the piezoelectric element is pressed Afterwards, to generate a voltage of the forward signal to the forward trigger terminal; after the piezoelectric element is pressed down, the voltage of the generated negative signal is converted into the voltage of the other forward signal by the rectifying unit to the Negative trigger on the end. The piezoelectric device of claim 2, wherein the filtering unit is a capacitor. The piezoelectric device of claim 2, wherein the rectifying unit is a full-wave rectifying unit or a half-wave rectifying unit. The piezoelectric device of the two-wire trigger signal according to claim 1, wherein the first protection unit and the second protection unit are two-dimensional diodes. The piezoelectric device of claim 2, wherein the input end of the first protection unit is electrically coupled to a first resistor and a first switch unit, the first switch The unit includes a first transistor and a third resistor, the first The protection unit is electrically connected between the gate and the source of the first transistor, and the source of the first transistor is grounded, and one end of the third resistor is electrically connected to the drain of the first transistor. The other end of the third resistor is electrically connected to the circuit power supply, and the electrical connection between one end of the third resistor and the drain of the first transistor is coupled to the forward trigger terminal. The piezoelectric device of claim 2, wherein a second resistor and a second switch unit are electrically connected to the input end of the second protection unit, the second The switching unit includes a second transistor and a fourth resistor. The second protection unit is electrically connected between the gate and the source of the second transistor, and the source of the second transistor is grounded. One end of the fourth resistor is electrically connected to the drain of the second transistor, and the other end of the fourth resistor is electrically connected to the circuit power source, and one end of the fourth resistor and the drain of the second transistor The electrical connection is connected to the negative trigger end. A piezoelectric device for a two-wire trigger signal, comprising: a piezoelectric element for generating a voltage output of a forward signal and a negative signal; a positive limiting unit electrically connected to the piezoelectric element; and a bridge rectifier The unit is electrically connected to the forward limiting unit; a forward triggering end is electrically connected to the bridge rectifier unit; and a negative triggering end is electrically connected to the bridge rectifier unit; After the piezoelectric element is pressed, a voltage of a forward signal is generated to the forward trigger end; after the piezoelectric element is pressed, the voltage of the generated negative signal is converted into another by the bridge rectifier unit. A forward signal voltage is applied to the negative trigger terminal. The piezoelectric device of claim 2, further comprising a filtering unit electrically connected between the piezoelectric element and the forward limiting unit, The filter unit is a capacitor. The piezoelectric device of claim 2, wherein the forward limiting unit is a diode. The piezoelectric device of claim 2, further comprising a first protection unit and a second protection unit, the first protection unit being electrically connected to the bridge rectifier Between the unit and the forward triggering end; the second protection unit is electrically connected between the bridge rectifier unit and the negative trigger terminal. The piezoelectric device of the two-wire trigger signal according to claim 10, wherein the first protection unit and the second protection unit are two-dimensional diodes. The piezoelectric device of claim 2, wherein the input end of the first protection unit is electrically coupled to a first resistor and a first switch unit, the first switch The unit includes a first transistor and a third resistor. The first protection unit is electrically connected between the gate and the source of the first transistor, and the source of the first transistor is grounded. One end of the three resistor is electrically connected to the first pole of the first transistor, and the other end of the third resistor is electrically connected to the circuit power source, and one end of the third resistor is opposite to the first transistor. A pole electrical connection is connected to the forward trigger end. The piezoelectric device of claim 2, wherein a second resistor and a second switch unit are electrically connected to the input end of the second protection unit, the second The switch unit includes a second transistor and a fourth resistor, The second protection unit is electrically connected between the gate and the source of the second transistor, the source of the second transistor is grounded, and the end of the fourth resistor is electrically connected to the second transistor. The other end of the fourth resistor is electrically connected to the circuit power supply, and one end of the fourth resistor is coupled to the negative polarity trigger end of the second transistor.