TWI767449B - Piezoelectric power generation circuit with impedance matching property - Google Patents

Abstract

A piezoelectric power generation circuit with an impedance matching property is proposed. The piezoelectric power generation circuit with the impedance matching property includes a piezoelectric patch, a rectifying unit and an impedance matching unit. An equivalent circuit of the piezoelectric patch includes an equivalent source, an internal resistance and a source capacitance connected with the internal resistance. The source capacitance connects the internal resistance to form a first impedance. The rectifying unit is electrically connected to the piezoelectric circuit. The impedance matching unit is serially or parallelly connected with the rectifying unit. The impedance matching unit includes a first transformer and an inductor. The inductor of the impedance matching unit forms a second impedance by coupling with the first transformer. Therefore, the first impedance can match with the second impedance. Thus, the piezoelectric power generation circuit with the impedance matching property increases the transforming efficiency by matching the impedance.

Description

Piezoelectric generating circuit with impedance matching

The present invention relates to a piezoelectric sheet power generation circuit, in particular to a piezoelectric sheet power generation circuit with impedance matching.

When the piezoelectric material is subjected to external stress and produces strain, it will have the characteristics of charge accumulation, which means converting mechanical energy into electrical energy. However, the electrical energy generated by piezoelectric materials cannot be completely converted and applied to the load. In view of this, there is currently a lack of a piezoelectric power generation circuit with impedance matching that can improve the conversion efficiency on the market, so the relevant industry is looking for its solution.

Therefore, an object of the present invention is to provide a piezoelectric sheet generating circuit with impedance matching, which adjusts the second impedance through the first-stage transformer of the impedance matching unit to match the second impedance with the first impedance.

According to one embodiment of the structural aspect of the present invention, there is provided a piezoelectric sheet power generation circuit with impedance matching, which includes a piezoelectric sheet, a rectifying unit and an impedance matching unit. The equivalent circuit of the piezoelectric sheet includes the equivalent power supply, the internal resistance of the power supply And the power supply terminal capacitor connected to the internal resistance of the power supply. The power supply terminal capacitor is connected to the internal resistance of the power supply and forms a first impedance. The rectifying unit is electrically connected to the piezoelectric sheet. The impedance matching unit is connected in series with the rectifying unit. The impedance matching unit includes a first-stage transformer and an inductor. The inductance of the impedance matching unit is coupled through the first-stage transformer to form a second impedance, so as to match the first impedance with the second impedance.

Thereby, the piezoelectric sheet power generation circuit with impedance matching of the present invention adjusts the second impedance through the first-stage transformer of the impedance matching unit, so that the second impedance matches the first impedance, and improves the impedance matching in a very short time. Electric energy conversion efficiency of piezoelectric power generation circuit.

Other examples of the aforementioned embodiments are as follows: the aforementioned first-stage transformer includes a first-side coil and a second-side coil. The second side coil is coupled to the inductor. The first stage transformer has a first coil turns ratio. The impedance matching unit further includes a second-stage transformer. The second-stage transformer is coupled between the rectifier unit and the first-stage transformer. The second stage transformer has a second coil turns ratio. The second impedance includes an equivalent inductance value, and the inductance includes an inductance value. The equivalent inductance value is the multiplication of the square of the turns ratio of the first coil, the square of the turns ratio of the second coil and the inductance value.

Other examples of the aforementioned embodiments are as follows: the aforementioned power supply internal resistance is connected in series with the power supply terminal capacitor. An equivalent power source is an equivalent voltage source. The internal resistance of the power supply is connected in series with the equivalent voltage source of the piezoelectric sheet.

Other examples of the aforementioned embodiment are as follows: the aforementioned internal resistance of the power supply includes a first end and a second end. The power terminal capacitor includes a first terminal and a second terminal. An equivalent power source is an equivalent current source. The first end of the internal resistance of the power supply is electrically connected to one end of the equivalent current source, and the second end of the internal resistance of the power supply is electrically connected to the first end of the capacitor of the power supply end Electrical connection. The second end of the power supply end capacitor is electrically connected to the other end of the equivalent current source.

According to another embodiment of the structural aspect of the present invention, there is provided a piezoelectric sheet generating circuit with impedance matching, which includes a piezoelectric sheet, a rectifying unit and an impedance matching unit. The equivalent circuit of the piezoelectric sheet includes an equivalent power supply, an internal resistance of the power supply, and a power supply terminal capacitor connected to the internal resistance of the power supply. The power supply terminal capacitor is connected to the internal resistance of the power supply and forms a first impedance. The rectifying unit is electrically connected to the piezoelectric sheet. The impedance matching unit is connected in parallel with the rectifying unit. The impedance matching unit includes a first-stage transformer and an inductor. The inductance of the impedance matching unit is coupled through the first-stage transformer to form a second impedance, so as to match the first impedance with the second impedance.

Thereby, the piezoelectric sheet power generation circuit with impedance matching of the present invention adjusts the second impedance through the first-stage transformer of the impedance matching unit, so that the second impedance matches the first impedance, and improves the impedance matching in a very short time. Electric energy conversion efficiency of piezoelectric power generation circuit.

Other examples of the aforementioned embodiments are as follows: the aforementioned first-stage transformer includes a first-side coil and a second-side coil. The second side coil is coupled to the inductor. The first stage transformer includes a first coil turns ratio.

Other examples of the aforementioned embodiments are as follows: the aforementioned impedance matching unit further includes a second-stage transformer. The second-stage transformer is coupled between the rectifier unit and the first-stage transformer. The second stage transformer has a second coil turns ratio. The second impedance includes an equivalent inductance value, and the inductance includes an inductance value. The equivalent inductance value is the multiplication of the square of the turns ratio of the first coil, the square of the turns ratio of the second coil and the inductance value.

Other examples of the aforementioned embodiments are as follows: the aforementioned power supply internal resistance string Connect the power supply capacitor. An equivalent power source is an equivalent voltage source. The internal resistance of the power supply is connected in series with the equivalent voltage source of the piezoelectric sheet.

Other examples of the aforementioned embodiment are as follows: the aforementioned internal resistance of the power supply includes a first end and a second end. The power terminal capacitor includes a first terminal and a second terminal. An equivalent power source is an equivalent current source. The first end of the internal resistance of the power supply is electrically connected to one end of the equivalent current source; the second end of the internal resistance of the power supply is electrically connected to the first end of the capacitor of the power supply end. The second end of the power supply end capacitor is electrically connected to the other end of the equivalent current source.

Other examples of the aforementioned embodiments are as follows: the aforementioned rectifier unit is a bridge rectifier circuit, and the rectifier unit includes four rectifier diodes and an energy storage capacitor. The energy storage capacitor is connected between the two rectifier diodes. The charging voltage of the energy storage capacitor is greater than the equivalent power supply voltage of the equivalent power supply.

100a, 100b, 100c, 100d: Piezoelectric generating circuit with impedance matching

110a, 110b, 110c, 110d: Piezoelectric sheet

120a, 120b, 120c, 120d: Rectifier unit

130a, 130b, 130c, 130d: Impedance matching unit

Vs: Equivalent voltage source

Is: Equivalent current source

Rs: internal resistance of the power supply

Cs: power terminal capacitance

D1, D2, D3, D4: Rectifier diodes

Cr: energy storage capacitor

T1: first stage transformer

T2: Second stage transformer

W1: First side coil

W2: Second side coil

L: Inductance

Z1: first impedance

Z2a, Z2b, Z2c, Z2d: second impedance

Vcr: charging voltage

a,c: the first end

b, d: the second end

FIG. 1 is a schematic diagram showing the structure of the piezoelectric sheet power generation circuit with impedance matching according to the first embodiment of the present invention; FIG. 2 is a circuit diagram of the piezoelectric sheet power generation circuit with impedance matching according to the embodiment of FIG. 1 Schematic diagram; Fig. 3 is a schematic diagram showing the charging voltage of the energy storage capacitor of the piezoelectric chip generating circuit with impedance matching according to the embodiment of Fig. 1; Fig. 4 is a schematic diagram showing the second embodiment of the present invention with impedance matching The circuit diagram of the piezoelectric sheet generating circuit; Fig. 5 shows the piezoelectric sheet with impedance matching according to the embodiment of Fig. 4 A schematic diagram of the charging voltage of the energy storage capacitor of the power generation circuit; FIG. 6 is a schematic circuit diagram of a piezoelectric sheet power generation circuit with impedance matching according to the third embodiment of the present invention; A schematic diagram of the charging voltage of the energy storage capacitor of the piezoelectric sheet power generation circuit with impedance matching; and FIG. 8 is a schematic circuit diagram of the piezoelectric sheet power generation circuit with impedance matching according to the fourth embodiment of the present invention.

Several embodiments of the present invention will be described below with reference to the drawings. For the sake of clarity, many practical details are set forth in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, for the purpose of simplifying the drawings, some well-known and conventional structures and elements will be shown in a simplified and schematic manner in the drawings; and repeated elements may be denoted by the same reference numerals.

In addition, when a certain element (or unit or module, etc.) is "connected" to another element herein, it may mean that the element is directly connected to another element, or it may also mean that a certain element is indirectly connected to another element , that is, there are other elements interposed between said element and another element. When it is expressly stated that an element is "directly connected" to another element, it means that no other element is interposed between the element and the other element. The terms first, second, third, etc. are only used to describe different elements, and do not limit the elements themselves. Therefore, the first element can also be renamed as the second element. and the combination of components/units/circuits herein Combinations that are not generally known, routine or well-known in this field cannot be determined by whether the components/units/circuits themselves are well-known or not to determine whether the combination relationship can be easily accomplished by those with ordinary knowledge in the technical field.

Please refer to FIG. 1 and FIG. 2. FIG. 1 is a schematic diagram showing the structure of the piezoelectric sheet generating circuit 100a with impedance matching according to the first embodiment of the present invention; and FIG. 2 is an embodiment according to FIG. 1. The circuit schematic diagram of the piezoelectric sheet generating circuit 100a with impedance matching. The piezoelectric sheet generating circuit 100a with impedance matching includes a piezoelectric sheet 110a, a rectifying unit 120a and an impedance matching unit 130a.

The equivalent circuit of the piezoelectric sheet 110a includes an equivalent power supply, a power supply internal resistance Rs, and a power supply terminal capacitor Cs connected to the power supply internal resistance Rs. The power supply terminal capacitor Cs is connected to the internal resistance Rs of the power supply and forms a first impedance Z1. The rectifying unit 120a is electrically connected to the piezoelectric sheet 110a. The impedance matching unit 130a is connected to the rectifying unit 120a in series. The impedance matching unit 130a includes a first-stage transformer T1 and an inductor L. The inductance L of the impedance matching unit 130a can form the second impedance Z2a alone or be coupled through the first-stage transformer T1 to form the second impedance Z2a, so as to match the first impedance Z1 and the second impedance Z2a.

Specifically, the power supply internal resistance Rs is connected in series with the power supply terminal capacitor Cs, the equivalent power supply is an equivalent voltage source Vs, and the power supply internal resistance Rs is connected in series with the equivalent voltage source Vs. The rectifier unit 120a is a bridge rectifier circuit, and includes four rectifier diodes D1, D2, D3, D4 and an energy storage capacitor Cr. The rectifier unit 120a is a conventional bridge rectifier filter. The energy storage capacitor Cr is connected between two of the rectifier diodes (ie, one group of the rectifier diodes D2 and D3 and one of the rectifier diodes D1 and D4 ). The first stage transformer of the impedance matching unit 130a T1 includes a first side coil W1 and a second side coil W2. The first side coil W1 is coupled to the rectifier unit 120a, and the second side coil W2 is coupled to the inductor L. The first stage transformer T1 has a first coil turns ratio. The second impedance Z2a is the impedance value calculated from the first side coil W1; the second impedance Z2a includes the equivalent inductance value, and the equivalent inductance value is the inductance value of the inductance L multiplied by the square of the first coil turns ratio.

Z2a=jωL×n1²=j×125.6×20×20²=j10⁶ (2)；其中，ω為125.6(ω=2πf)；f為頻率；j為虛部部分；n1為第一線圈匝數比，由式(1)及式(2)可知，第一阻抗Z1及第二阻抗Z2a的電抗部分相互抵銷後趨近於零。藉此，本發明之具阻抗匹配之壓電片發電電路100a透過阻抗匹配單元130a之電感L及第一級變壓器T1調整第二阻抗 Z2a，使第二阻抗Z2a與第一阻抗Z1匹配，並在極短時間內提高具阻抗匹配之壓電片發電電路100a之電能轉換效率。 Please refer to FIG. 2 and FIG. 3 together. FIG. 3 is a schematic diagram showing the charging voltage Vcr of the storage capacitor Cr of the piezoelectric chip generating circuit 100a with impedance matching according to the embodiment of FIG. 1 . Specifically, in the embodiment shown in FIG. 2, the peak value of the equivalent voltage source Vs is 19.86V, the power supply internal resistance Rs is 11.18Ω, the power supply terminal capacitance Cs is 7.33nF, and the types of the rectifier diodes D1 to D4 are all D1N4002, the energy storage capacitor Cr is 100μF, the inductor L is 20H, and the first coil turns ratio is 20. The vertical axis of Fig. 3 represents the voltage of the storage capacitor Cr; the horizontal axis represents the charging time of the storage capacitor Cr. After impedance matching, the charging voltage Vcr of the energy storage capacitor Cr can reach 16V within five seconds. The calculation methods of the first impedance Z1 and the second impedance Z2a are shown in the following formulas (1) and (2):

Z2a=jωL×n1 ² =j×125.6×20×20 ² =j10 ⁶ (2); among them, ω is 125.6 (ω=2πf); f is the frequency; j is the imaginary part; n1 is the number of turns of the first coil It can be seen from equations (1) and (2) that the reactance parts of the first impedance Z1 and the second impedance Z2a cancel each other out and approach zero. Thereby, the piezoelectric sheet generating circuit 100a with impedance matching of the present invention adjusts the second impedance Z2a through the inductance L of the impedance matching unit 130a and the first-stage transformer T1, so that the second impedance Z2a is matched with the first impedance Z1, and The power conversion efficiency of the piezoelectric sheet generating circuit 100a with impedance matching is improved in a very short time.

Please refer to FIG. 4 . FIG. 4 is a schematic circuit diagram of a piezoelectric sheet generating circuit 100 b with impedance matching according to a second embodiment of the present invention. The piezoelectric sheet generating circuit 100b with impedance matching includes a piezoelectric sheet 110b, a rectifying unit 120b and an impedance matching unit 130b. The equivalent circuit of the piezoelectric sheet 110b includes an equivalent power supply, a power supply internal resistance Rs, and a power supply terminal capacitor Cs connected to the power supply internal resistance Rs. The power supply terminal capacitor Cs is connected to the power supply internal resistance Rs and forms a first impedance Z1. The rectifier unit 120b is electrically connected to the piezoelectric sheet 110b, and includes four rectifier diodes D1-D4 and an energy storage capacitor Cr. The impedance matching unit 130b is connected to the rectifying unit 120b in series, and includes a first-stage transformer T1 and an inductor L, and the equivalent power source is an equivalent voltage source Vs. In this embodiment, the piezoelectric sheet 110b, the rectifier unit 120b, the equivalent voltage source Vs, the power supply internal resistance Rs, the power supply terminal capacitance Cs, the first impedance Z1, the rectifier diodes D1-D4, and the energy storage capacitor Cr are respectively The piezoelectric sheet 110a, the rectifier unit 120a, the equivalent voltage source Vs, the power supply internal resistance Rs, the power supply terminal capacitor Cs, the first impedance Z1, the rectifier diodes D1-D4 and the energy storage capacitor Cr in the first embodiment have the same structure. No longer. In particular, the impedance matching unit 130b further includes a second-stage transformer T2. The second-stage transformer T2 is coupled between the rectifier unit 120b and the first-side coil W1 of the first-stage transformer T1, and the first-stage transformer T1 has a first coil turns ratio; the second-stage transformer T2 has a second coil turn number ratio. At this time, the equivalent inductance value of the second impedance Z2b is multiplied by the square of the turns ratio of the first coil and the square of the turns ratio of the second coil, and multiplied by the inductance value of the inductance L. The calculation method of the equivalent inductance value of the second impedance Z2b is shown in the following formula (3): Leq=(n1) ² ×(n2) ² ×Lval (3); where Leq is the equivalent inductance value; n1 is the first coil turns ratio; n2 is the turns ratio of the second coil; Lval is the inductance value of the inductance L.

Please refer to FIG. 4 and FIG. 5 together. FIG. 5 is a schematic diagram illustrating the charging voltage Vcr of the storage capacitor Cr of the piezoelectric chip generating circuit 100b with impedance matching according to the embodiment of FIG. 4 . Specifically, in the embodiment shown in FIG. 4, the peak value of the equivalent voltage source Vs is 19.86V, the power supply internal resistance Rs is 11.18Ω, the power supply terminal capacitance Cs is 7.33nF, and the models of the rectifier diodes D1 to D4 are all D1N4002, the energy storage capacitor Cr is 100μF, the inductance L is 0.0507H, the turns ratio of the first coil is 20, and the turns ratio of the second coil is 20. The vertical axis of Fig. 5 represents the voltage of the storage capacitor Cr; the horizontal axis represents the charging time of the storage capacitor Cr. After impedance matching, the charging voltage Vcr of the energy storage capacitor Cr can reach 17V within five seconds. Thereby, the piezoelectric sheet generating circuit 100b with impedance matching of the present invention adjusts the second impedance Z2b through the equivalent inductance value generated by the first-stage transformer T1 and the second-stage transformer T2 of the impedance matching unit 130b, so that the second impedance Z2b is matched with the first impedance Z1, and the power conversion efficiency of the piezoelectric sheet generating circuit 100b with impedance matching is improved in a very short time. In this embodiment, the number of transformers coupled in the impedance matching unit 130b is two, but the present invention is not limited to this. When the inductance L is limited, the number of transformers can be connected by coupling multi-stage transformers or not using transformers. The second impedance Z2b is matched with the first impedance Z1.

Please refer to FIG. 6, which shows a third embodiment of the present invention A schematic circuit diagram of the piezoelectric sheet generating circuit 100c with impedance matching. The piezoelectric sheet generating circuit 100c with impedance matching includes a piezoelectric sheet 110c, a rectifying unit 120c and an impedance matching unit 130c. The equivalent circuit of the piezoelectric sheet 110c includes an equivalent power supply, a power supply internal resistance Rs, and a power supply terminal capacitor Cs connected to the power supply internal resistance Rs. The power supply terminal capacitor Cs is connected to the internal resistance Rs of the power supply and forms a first impedance Z1. The equivalent power source is the equivalent voltage source Vs. The rectifying unit 120c is electrically connected to the piezoelectric sheet 110c. The impedance matching unit 130c includes a first-stage transformer T1 and an inductor L. The inductance L of the impedance matching unit 130c is coupled through the first-stage transformer T1 to form a second impedance Z2c, so that the first impedance Z1 and the second impedance Z2c are matched. In this embodiment, the piezoelectric sheet 110c, the rectifier unit 120c, the equivalent voltage source Vs, the power supply internal resistance Rs, the power supply terminal capacitance Cs, the first impedance Z1, the rectifier diodes D1-D4, the energy storage capacitor Cr, the impedance The matching unit 130c, the first-stage transformer T1 and the inductance L are respectively the same as the piezoelectric sheet 110a of the first embodiment, the rectifier unit 120a, the equivalent voltage source Vs, the power supply internal resistance Rs, the power supply terminal capacitance Cs, the first impedance Z1, the rectifier The structures of the diodes D1 to D4, the energy storage capacitor Cr, the impedance matching unit 130a, the first-stage transformer T1 and the inductor L are the same, and will not be repeated here. In particular, the impedance matching unit 130c is connected in parallel with the rectifying unit 120c. In another embodiment, the impedance matching unit may further include a second-stage transformer, which is connected between the first-stage transformer and the piezoelectric sheet, and the second-stage transformer is equivalent to the second-stage transformer T2 in FIG. 4 . The number of the second-stage transformers can be determined according to requirements, and the present invention is not limited to the above.

Please refer to FIG. 6 and FIG. 7 together. FIG. 7 shows the piezoelectric sheet generating circuit 100c with impedance matching according to the embodiment of FIG. 6 . A schematic diagram of the charging voltage Vcr of the energy storage capacitor Cr. Specifically, in the embodiment shown in Fig. 6, the peak value of the equivalent voltage source Vs is 19.86V, the power supply internal resistance Rs is 11.18Ω, the power supply terminal capacitance Cs is 7.33nF, and the models of the rectifier diodes D1 to D4 are all D1N4002, the energy storage capacitor Cr is 100μF, and the first coil turns ratio is 20. The vertical axis of FIG. 7 represents the charging voltage Vcr of the storage capacitor Cr; the horizontal axis represents the charging time of the storage capacitor Cr. When the inductance value of the inductor L is between 0.04H and 0.06H, after impedance matching, the charging voltage Vcr of the energy storage capacitor Cr can reach the equivalent power supply voltage greater than the equivalent voltage source Vs within 200 seconds. Thereby, the piezoelectric sheet generating circuit 100c with impedance matching of the present invention is connected in parallel with the rectifying unit 120c through the impedance matching unit 130c, thereby improving the power conversion efficiency of the piezoelectric sheet generating circuit 100c with impedance matching.

Please refer to FIG. 8 . FIG. 8 is a schematic circuit diagram of a piezoelectric sheet generating circuit 100 d with impedance matching according to a fourth embodiment of the present invention. The piezoelectric sheet generating circuit 100d with impedance matching includes a piezoelectric sheet 110d, a rectifying unit 120d and an impedance matching unit 130d. The equivalent circuit of the piezoelectric sheet 110d includes an equivalent power supply, a power supply internal resistance Rs, and a power supply terminal capacitor Cs connected to the power supply internal resistance Rs. The power supply terminal capacitor Cs is connected to the internal resistance Rs of the power supply and forms a first impedance Z1. The rectifying unit 120d is electrically connected to the piezoelectric sheet 110d. The impedance matching unit 130d includes a first-stage transformer T1 , a second-stage transformer T2 and an inductor L. The inductance L of the impedance matching unit 130d is coupled through the first-stage transformer T1 and the second-stage transformer T2 to form a second impedance Z2d, so that the first impedance Z1 and the second impedance Z2d are matched. In this embodiment, the rectifier unit 120d, the first impedance Z1, the rectifier diodes D1-D4, the storage The energy capacitor Cr, the impedance matching unit 130d, the first-stage transformer T1, the second-stage transformer T2, and the inductor L are respectively the same as the rectifier unit 120c, the first impedance Z1, the rectifier diodes D1-D4, and the energy storage capacitor of the third embodiment. The structures of Cr, the impedance matching unit 130c, the first-stage transformer T1, the second-stage transformer T2, and the inductor L are the same, and will not be repeated here. In particular, the power supply internal resistance Rs includes a first terminal a and a second terminal b, and the power supply terminal capacitor Cs includes a first terminal c and a second terminal d. The equivalent power supply is an equivalent current source Is, the first terminal a of the internal resistance Rs of the power supply is electrically connected to one terminal of the equivalent current source Is; the second terminal b of the internal resistance Rs of the power supply and the first terminal c of the capacitor Cs of the power supply terminal are electrically connected For electrical connection, the second terminal d of the power supply terminal capacitor Cs is electrically connected to the other terminal of the equivalent current source Is. In addition, the piezoelectric sheet 110d can also be a Norton equivalent circuit.

Thereby, the piezoelectric sheet generating circuit 100d with impedance matching of the present invention is connected in parallel with the rectifying unit 120d through the impedance matching unit 130d, thereby improving the power conversion efficiency of the piezoelectric sheet generating circuit 100d with impedance matching.

It can be seen from the above embodiments that the present invention has the following advantages: First, the piezoelectric sheet generating circuit with impedance matching of the present invention adjusts the second impedance through the first-stage transformer of the impedance matching unit, so that the second impedance matches the first impedance , and improve the power conversion efficiency of the piezoelectric sheet generating circuit with impedance matching in a very short time. Second, the piezoelectric sheet power generation circuit with impedance matching of the present invention adjusts the second impedance through the equivalent inductance value generated by the first-stage transformer and the second-stage transformer of the impedance matching unit, so that the second impedance matches the first impedance , and improve the power conversion efficiency of the piezoelectric sheet generating circuit with impedance matching in a very short time. Thirdly, the piezoelectric sheet generating circuit with impedance matching of the present invention is connected in series or in parallel with the impedance matching unit and the rectifying unit, which can improve the Electric energy conversion efficiency of piezoelectric sheet generator circuit with impedance matching.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be determined by the scope of the appended patent application.

100a: Piezoelectric generating circuit with impedance matching

110a: Piezoelectric sheet

120a: Rectifier unit

130a: Impedance matching unit

Claims (10)

A piezoelectric sheet generating circuit with impedance matching, comprising: A piezoelectric sheet, an equivalent circuit of the piezoelectric sheet includes an equivalent power supply, a power supply internal resistance and a power supply terminal capacitor connected to the power supply internal resistance, the power supply terminal capacitance is connected to the power supply internal resistance and forms a first an impedance; a rectifier unit electrically connected to the piezoelectric sheet; and an impedance matching unit connected in series with the rectifying unit, the impedance matching unit comprising a first-stage transformer and an inductor; Wherein, the inductance of the impedance matching unit is coupled through the first-stage transformer to form a second impedance, so as to match the first impedance with the second impedance. The piezoelectric sheet power generation circuit with impedance matching according to claim 1, wherein, This first stage transformer contains: a first side coil; and a second side coil, coupled to the inductor; wherein the first stage transformer has a first coil turns ratio; and The impedance matching unit further includes: a second-stage transformer coupled between the rectifier unit and the first-stage transformer, the second-stage transformer having a second coil turns ratio; Wherein, the second impedance includes an equivalent inductance value, the inductance includes an inductance value, and the equivalent inductance value is the sum of the square of the turns ratio of the first coil, the square of the turns ratio of the second coil and the inductance value Multiply. The piezoelectric sheet power generation circuit with impedance matching according to claim 1, wherein, The power supply internal resistance is connected in series with the power supply terminal capacitor; the equivalent power source is an equivalent voltage source; and The internal resistance of the power source is connected in series with the equivalent voltage source of the piezoelectric sheet. The piezoelectric sheet power generation circuit with impedance matching according to claim 1, wherein, The internal resistance of the power supply includes a first end and a second end; the power terminal capacitor includes a first terminal and a second terminal; and The equivalent power source is an equivalent current source; Wherein, the first end of the internal resistance of the power supply is electrically connected to one end of the equivalent current source; the second end of the internal resistance of the power supply is electrically connected to the first end of the power supply terminal capacitor, and the power supply terminal capacitor The second end is electrically connected to the other end of the equivalent current source. A piezoelectric sheet generating circuit with impedance matching, comprising: A piezoelectric sheet, an equivalent circuit of the piezoelectric sheet includes an equivalent power supply, an internal resistance of the power supply, and a power supply terminal capacitor connected to the internal resistance of the power supply, and the power supply terminal capacitor is connected to the internal resistance of the power supply and forms a first impedance; a rectifier unit electrically connected to the piezoelectric sheet; and an impedance matching unit connected in parallel with the rectifying unit, the impedance matching unit comprising a first-stage transformer and an inductor; Wherein, the inductance of the impedance matching unit is coupled through the first-stage transformer to form a second impedance, so as to match the first impedance with the second impedance. The piezoelectric sheet generating circuit with impedance matching according to claim 5, the first-stage transformer comprises: a first side coil; a second side coil, coupled to the inductor; Wherein, the first-stage transformer includes a first coil turns ratio. The piezoelectric sheet generating circuit with impedance matching according to claim 6, wherein the impedance matching unit further comprises: a second-stage transformer coupled between the rectifier unit and the first-stage transformer, the second-stage transformer having a second coil turns ratio; Wherein, the second impedance includes an equivalent inductance value, the inductance includes an inductance value, and the equivalent inductance value is the sum of the square of the turns ratio of the first coil, the square of the turns ratio of the second coil and the inductance value Multiply. The piezoelectric sheet power generation circuit with impedance matching according to claim 5, wherein, The power supply internal resistance is connected in series with the power supply terminal capacitor; the equivalent power source is an equivalent voltage source; and The internal resistance of the power source is connected in series with the equivalent voltage source of the piezoelectric sheet. The piezoelectric sheet power generation circuit with impedance matching according to claim 5, wherein, The internal resistance of the power supply includes a first end and a second end; the power terminal capacitor includes a first terminal and a second terminal; and The equivalent power source is an equivalent current source; Wherein, the first end of the internal resistance of the power supply is electrically connected to one end of the equivalent current source; the second end of the internal resistance of the power supply is electrically connected to the first end of the power supply terminal capacitor, and the power supply terminal capacitor The second end is electrically connected to the other end of the equivalent current source. The piezoelectric sheet power generation circuit with impedance matching according to claim 5, wherein the rectifier unit is a bridge rectifier circuit, and the rectifier unit comprises: four rectifier diodes; and an energy storage capacitor, connected between two of the rectifier diodes; Wherein, a charging voltage of the energy storage capacitor is greater than an equivalent power supply voltage of the equivalent power supply.

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