CN109804563B

CN109804563B - Rectifying circuit and rectifier

Info

Publication number: CN109804563B
Application number: CN201680090095.8A
Authority: CN
Inventors: 李强
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-10-14
Filing date: 2016-10-14
Publication date: 2021-01-29
Anticipated expiration: 2036-10-14
Also published as: WO2018068330A1; CN109804563A

Abstract

A rectifier circuit and a rectifier relate to the technical field of electronics and can work normally when the voltage of an alternating current signal input into the rectifier circuit is smaller than Vth. The rectifying circuit (E) comprises a biasing module (A), a comparison module (B), an amplifying module (C) and a rectifying transistor (D); the power supply end of the bias module (A) is connected with the output end of the rectifying circuit (E), the output end of the bias module (A) is connected with the bias end of the comparison module (B) and the bias end of the amplification module (C), the first input end of the comparison module (B) is connected with the input end of the rectifying circuit (E), the second input end of the comparison module (B) is connected with the output end of the rectifying circuit (E), the output end of the comparison module (B) is connected with the input end of the amplification module (C), the power supply end of the amplification module (C) is connected with the output end of the rectifying circuit (E), the output end of the amplification module (C) is connected with the grid of the rectifying transistor (D), the source electrode of the rectifying transistor (D) is connected with the input end of the rectifying circuit (E), and the drain electrode of the rectifying. The bias module (A) provides a bias voltage which is smaller than the threshold voltage of the transistor for the comparison module (B) and the amplification module (C); the comparison module (B) compares the input voltage of the input end of the rectification circuit (E) with the output voltage of the output end of the rectification circuit (E) and then outputs a control signal to the amplification module (C); the amplifying module (C) amplifies the control signal and outputs the control signal to the grid of the rectifying transistor (D) so as to control the on or off of the rectifying transistor.

Description

Rectifying circuit and rectifier

Technical Field

The invention relates to the technical field of electronics, in particular to a rectifying circuit and a rectifier.

Background

In recent years, energy harvesting technology is developed, and generally, during energy harvesting by using the energy harvesting technology, an alternating current signal input to the energy harvesting technology needs to be converted into a direct current signal through a rectifier.

At present, a passive rectification circuit in a rectifier is generally formed by using a Complementary Metal Oxide Semiconductor (CMOS) tube connected in a diode form, and since a voltage drop across the CMOS tube connected in a diode form is large and is about a threshold voltage (Vth) of the CMOS tube, the passive rectification circuit cannot normally operate when a voltage value of an ac signal input to the passive rectification circuit is close to, far less than or equal to Vth. In order to solve this problem, a rectifier circuit as shown in fig. 1 is proposed, in fig. 1, when the transistor M01 is turned on, the transistor M01 operates in a linear region, and at this time, the voltage drop of the transistor M01 is a voltage difference between the drain and the source of the transistor M01, and since the voltage difference between the drain and the source of the transistor M01 is usually several tens of millivolts (much less than Vth, which is usually in the order of volts), the voltage drop of the transistor M01 is relatively small, so that the rectifier circuit can still operate normally when the voltage value of the ac signal input by the rectifier circuit is greater than Vth or equal to Vth.

Since the comparator in fig. 1 is in a substrate-driven structure, that is, two input terminals of the comparator are respectively connected to the substrates of the transistor M05 and the transistor M06, the lowest operating voltage of the comparator is reduced to Vth by the connection method, but when the voltage of the ac signal input to the rectifying circuit is less than Vth, the lowest operating voltage of the comparator cannot be reached, so the comparator cannot normally operate, and the rectifying circuit cannot normally operate.

Disclosure of Invention

The present application provides a rectifier circuit and a rectifier, which can work normally when the voltage of an alternating current signal input to the rectifier circuit is less than Vth.

In order to achieve the purpose, the technical scheme is as follows:

in a first aspect, a rectifier circuit is provided, which includes: the circuit comprises a bias module, a comparison module, an amplification module and a rectifying transistor. The power supply end of the bias module is connected with the output end of the rectifying circuit, the output end of the bias module is connected with the bias end of the comparison module and the bias end of the amplification module, the first input end of the comparison module is connected with the input end of the rectifying circuit, the second input end of the comparison module is connected with the output end of the rectifying circuit, the output end of the comparison module is connected with the input end of the amplification module, the power supply end of the amplification module is connected with the output end of the rectifying circuit, the output end of the amplification module is connected with the grid electrode of the rectifying transistor, the source electrode of the rectifying transistor is connected with the input. The bias module is used for providing bias voltage for the comparison module and the amplification module, and the bias voltage is smaller than the threshold voltage of the transistor; the comparison module is used for comparing the input voltage of the input end of the rectification circuit with the output voltage of the output end of the rectification circuit and outputting a control signal to the amplification module according to a comparison result; the amplifying module is used for amplifying the control signal and outputting the amplified control signal to the grid of the rectifying transistor so as to control the on or off of the rectifying transistor.

The rectifier circuit that this application provided can provide bias voltage for comparison module and amplifier module through the bias module, make comparison module can compare the input voltage of rectifier circuit's input and the output voltage of rectifier circuit's output under bias voltage's bias, and output control signal to amplifier module according to the result of comparison, then amplifier module amplifies the control signal of comparison module output again, and export the control signal after amplifying to rectifier transistor's grid, with control rectifier transistor switches on or ends, thereby control rectifier circuit rectifies the alternating current signal of rectifier circuit's input. In the rectifier circuit, because the bias voltage provided by the bias module for the comparison module and the amplification module is less than the threshold voltage of the transistor, the comparison module and the amplification module in the rectifier circuit can also work normally under the condition that the input voltage of the input end of the rectifier circuit is less than the threshold voltage of the transistor, thereby ensuring that the rectifier circuit can work normally under the condition that the input voltage of the input end of the rectifier circuit is less than the threshold voltage of the transistor.

In the rectifier circuit provided by the application, the substrate of the rectifier transistor is connected with the output end of the rectifier circuit, so that a substrate parasitic diode can be formed between the input end of the rectifier circuit and the output end of the rectifier circuit. When the rectifying circuit starts, the input voltage of the input end of the rectifying circuit is larger than the output voltage of the output end of the rectifying circuit, so that the current in the rectifying circuit flows to the output end of the rectifying circuit from the input end of the rectifying circuit through the substrate parasitic diode, and the rectifying circuit is started smoothly. Compared with the rectifying circuit which is started by a transistor in the prior art, the rectifying circuit provided by the application simplifies the structure of the rectifying circuit and saves the area of the rectifying circuit.

In the rectifier circuit provided by the application, because the substrate of the rectifier transistor is connected with the output end of the rectifier circuit, and the loss of the rectifier circuit is smaller under the condition that the rectifier transistor is completely conducted, the output voltage of the output end of the rectifier circuit is larger (namely close to the maximum value of the input voltage of the input end of the rectifier circuit), and the substrate of the rectifier transistor can be ensured to be always at a high potential. Compared with the rectifying circuit provided by the prior art in which the substrate of the rectifying transistor is controlled by the substrate regulator to be always at a high potential, the rectifying circuit provided by the application does not need to redesign the circuit structure of the substrate regulator part, so that the structure of the rectifying circuit can be further simplified, and the area of the rectifying circuit is saved.

In a first possible implementation manner of the first aspect, the bias module in the rectifier circuit provided by the present application includes: the circuit comprises a first resistor, a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor and a sixth transistor, wherein one end of the first resistor is a power supply end of a bias module, and a drain electrode of the fifth transistor is an output end of the bias module; one end of the first resistor is connected with the output end of the rectifying circuit, the source electrode of the fourth transistor and the source electrode of the fifth transistor, and the other end of the first resistor is connected with the grid electrode of the first transistor and the grid electrode of the second transistor; the drain electrode of the first transistor is connected with the grid electrode of the first transistor, and the source electrode of the first transistor is connected with the drain electrode of the second transistor and the grid electrode of the third transistor; the source electrode of the second transistor is grounded; the drain electrode of the third transistor is connected with the drain electrode of the fourth transistor, and the source electrode of the third transistor is grounded; the grid electrode of the fourth transistor is connected with the drain electrode of the fourth transistor and the grid electrode of the fifth transistor; the drain of the fifth transistor is connected to the drain of the sixth transistor and the gate of the sixth transistor, and the source of the sixth transistor is grounded.

In this application, because the bias module in the rectifier circuit can provide the bias voltage that is less than the threshold voltage of transistor for comparison module and amplifier module, so can be so that under the condition that the input voltage of rectifier circuit's input is less than the threshold voltage of transistor, comparison module and amplifier module in the rectifier circuit that this application provided still can normally work to the rectifier circuit that has guaranteed this application and provided can normally work under the condition that the input voltage of rectifier circuit's input is less than the threshold voltage of transistor.

In a second possible implementation manner of the first aspect, the comparison module in the rectifier circuit provided by the present application includes: the gate of the ninth transistor is a bias end of the comparison module, the source of the seventh transistor is a first input end of the comparison module, the source of the eighth transistor is a second input end of the comparison module, and the drain of the eighth transistor is an output end of the comparison module; the grid electrode of the seventh transistor is connected with the drain electrode of the seventh transistor, the grid electrode of the eighth transistor and the drain electrode of the ninth transistor, and the source electrode of the seventh transistor is connected with the input end of the rectifying circuit; the drain electrode of the eighth transistor is connected with the drain electrode of the tenth transistor, and the source electrode of the eighth transistor is connected with the output end of the rectifying circuit; the gate of the ninth transistor is connected to the gate of the tenth transistor, and the source of the ninth transistor and the source of the tenth transistor are grounded.

In this application, because the comparison module in the rectifier circuit adopts the form of source input, namely, the source and the substrate of the seventh transistor are both connected with the input end of the rectifier circuit, therefore, no matter how the amplitude of the input voltage of the input end of the rectifier circuit changes, and even if the input voltage of the input end of the rectifier circuit is smaller than the output voltage of the output end of the rectifier circuit, the current of the rectifier circuit can not flow from the output end of the rectifier circuit to the input end of the rectifier circuit through the substrate parasitic diode of the seventh transistor, namely, the rectifier circuit can not generate reverse current. Compared with the mode that the comparator adopts the substrate input in the rectifying circuit provided by the prior art (when the mode of substrate input is adopted, if the amplitude of the input voltage of the input end of the rectifying circuit is larger, and the input voltage of the input end of the rectifying circuit is smaller than the output voltage of the output end of the rectifying circuit, reverse current can be generated, so that the rectifying circuit cannot work normally).

In a third possible implementation manner of the first aspect, the present application provides an amplifying module in a rectifier circuit, including: the power amplifier comprises an eleventh transistor, a twelfth transistor, a thirteenth transistor and a fourteenth transistor, wherein the gate of the thirteenth transistor is a bias terminal of the amplifying module, the gate of the eleventh transistor is an input terminal of the amplifying module, the source of the eleventh transistor is a power supply terminal of the amplifying module, and the drain of the twelfth transistor is an output terminal of the amplifying module. The grid electrode of the eleventh transistor is connected with the output end of the comparison module, the drain electrode of the eleventh transistor is connected with the grid electrode of the twelfth transistor and the drain electrode of the thirteenth transistor, and the source electrode of the eleventh transistor is connected with the output end of the rectification circuit and the source electrode of the twelfth transistor; a drain electrode of the twelfth transistor is connected with a drain electrode of the fourteenth transistor; the gate of the thirteenth transistor is connected with the output end of the bias module and the gate of the fourteenth transistor, and the source of the thirteenth transistor and the source of the fourteenth transistor are grounded.

In the application, under the bias of the bias voltage provided by the bias module, the current of each branch in the amplification module can be always maintained in a relatively small range by the amplification module in the rectification circuit. Compared with a four-stage reverse driver in a comparator in the prior art (when a control signal output by a comparison module in the comparator in the prior art is switched, namely the control signal is switched from a high level to a low level, or from the low level to the high level, the current of each branch in the four-stage reverse driver is increased instantly, so that the power consumption of the four-stage reverse driver is also increased), the power consumption of each branch in an amplification module provided by the application is kept in a relatively small range all the time, so that the power consumption of the amplification module is relatively small, and the power consumption of a rectification circuit can be reduced.

In a fourth possible implementation manner of the first aspect, the rectifier circuit provided by the present application further includes a starting module. The power supply end of the starting module is connected with the input end of the rectifying circuit, the input end of the starting module is connected with the output end of the rectifying circuit, and the output end of the starting module is connected with the offset end of the comparing module and the offset end of the amplifying module. The starting module is used for providing bias voltage for the comparison module and the amplification module under the condition that no output voltage exists at the output end of the rectification circuit.

In this application, the power end of the bias module in the rectifier circuit is connected with the output end of the rectifier circuit, the output end of the rectifier circuit provides power supply voltage for the bias module, under the condition that the output end of the rectifier circuit does not normally output, the bias module probably can not normally work, so the bias module can not provide bias voltage for the comparison module and the amplification module, at the moment, in order to ensure that the rectifier circuit can be normally started, the bias voltage can be temporarily provided for the comparison module and the amplification module through the starting module, so that the rectifier circuit can be normally started, and the normal work of the rectifier circuit is ensured.

In a fifth possible implementation manner of the first aspect, the starting module in the rectifying circuit provided by the present application includes a fifteenth transistor, a gate of the fifteenth transistor is an input terminal of the starting module, a source of the fifteenth transistor is a power supply terminal of the starting module, and a drain of the fifteenth transistor is an output terminal of the starting module. The grid electrode of the fifteenth transistor is connected with the output end of the rectifying circuit, the drain electrode of the fifteenth transistor is connected with the offset end of the comparison module and the offset end of the amplification module, and the source electrode of the fifteenth transistor is connected with the input end of the rectifying circuit.

In this application, the power end of the bias module in the rectifier circuit is connected with the output end of the rectifier circuit, the output end of the rectifier circuit provides power supply voltage for the bias module, under the condition that the output end of the rectifier circuit does not have normal output, the bias module probably can not normally work, then the bias module can not provide bias voltage for the comparison module and the amplification module, at this moment, in order to guarantee that the rectifier circuit can normally start, the fifteenth transistor in the start module can be controlled to be conducted, thereby the input voltage of the input end of the rectifier circuit can be output to the bias end of the comparison module and the bias end of the amplification module through the fifteenth transistor, temporarily provide bias voltage for the comparison module and the amplification module, thereby make the rectifier circuit normally start, and further guarantee the normal work of the rectifier circuit.

In a sixth possible implementation manner of the first aspect, the rectifier circuit provided by the present application further includes a voltage stabilizing capacitor, one end of the voltage stabilizing capacitor is connected to the output end of the bias module and the output end of the start module, and the other end of the voltage stabilizing capacitor is grounded.

In this application, the voltage stabilizing capacitor in the rectifying circuit may store the voltage at the output terminal of the start module (or the output terminal of the offset module) so as to stabilize the voltage at the output terminal of the start module when the start module provides the offset voltage for the comparing module and the amplifying module.

In a second aspect, the present application provides a rectifier, which includes a first rectifying circuit and a filter capacitor, where the first rectifying circuit is the rectifying circuit described in the first aspect and any one of the various possible implementations thereof, one end of the filter capacitor is connected to an output end of the first rectifying circuit, and the other end of the filter capacitor is grounded.

In a first possible implementation manner of the second aspect, the rectifier provided by the present application further includes a second rectification circuit and an input control module, where the second rectification circuit is the rectification circuit described in the first aspect and any one of the various possible implementation manners. The input end of the first rectifying circuit and the input end of the second rectifying circuit are connected with the input control module, and the output end of the first rectifying circuit is connected with the output end of the second rectifying circuit. The input control module is used for controlling a differential input signal to be input into the input end of the first rectifying circuit in a first time period so as to enable the first rectifying circuit to work, and controlling the differential input signal to be input into the input end of the second rectifying circuit in the first time period so as to enable the second rectifying circuit to work.

In a second possible implementation manner of the second aspect, the input control module includes: a sixteenth transistor and a seventeenth transistor. The grid electrode of the sixteenth transistor is connected with the input end of the first rectifying circuit, the drain electrode of the sixteenth transistor is connected with the input end of the second rectifying circuit, and the source electrode of the sixteenth transistor is grounded; the grid electrode of the seventeenth transistor is connected with the input end of the second rectifying circuit, the drain electrode of the seventeenth transistor is connected with the input end of the first rectifying circuit, and the source electrode of the seventeenth transistor is grounded.

For a description of the beneficial effects of the second aspect and various possible implementations thereof, reference may be made to the above description of the beneficial effects of the first aspect and various possible implementations thereof, and details are not described herein again.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.

FIG. 1 is a schematic diagram of a rectifier circuit provided in the prior art;

fig. 2 is a first schematic diagram of a rectifier circuit according to an embodiment of the present invention;

fig. 3 is a second schematic diagram of a rectifier circuit according to an embodiment of the present invention;

fig. 4 is a third schematic diagram of a rectifier circuit according to an embodiment of the present invention;

fig. 5 is a fourth schematic diagram of a rectifier circuit according to an embodiment of the present invention;

fig. 6 is a fifth schematic diagram of a rectifier circuit according to an embodiment of the present invention;

fig. 7 is a sixth schematic diagram of a rectifier circuit according to an embodiment of the present invention;

fig. 8 is a seventh schematic diagram of a rectifier circuit according to an embodiment of the present invention;

fig. 9 is a first schematic diagram of a rectifier according to an embodiment of the present invention;

fig. 10 is a second schematic diagram of a rectifier according to an embodiment of the present invention;

fig. 11 is a third schematic diagram of a rectifier according to an embodiment of the present invention.

Detailed Description

Technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.

The terms "first", "second", and "third", etc. in the embodiments of the present invention are used for distinguishing different objects, not for describing a particular order. For example, the first transistor, the second transistor, the third transistor, and the like are for distinguishing different transistors, and are not for describing a specific order of the different transistors.

In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

A rectifier is a device that can convert an ac signal to a dc signal. Generally, a rectifier is composed of a rectifying circuit, a filter and the like, and the rectifier can be applied in an energy collection technology, for example, in the process of collecting vibration energy by using the energy collection technology, after the vibration energy is converted into an alternating current signal, the alternating current signal needs to be rectified by the rectifier and converted into a direct current signal after being filtered by the filter to be supplied to a load for use, so that the collection and utilization of the vibration energy are realized. Generally, in the case where the vibration energy is weak, after converting the vibration energy into an alternating current signal, the voltage of the ac signal is small, so that the rectifier is required to work normally even when the voltage of the ac signal input to the rectifier is small, in the prior art, the comparator shown in fig. 1 adopts a substrate-driven structure, i.e. the two inputs of the comparator are connected to the substrate of transistor M05 and transistor M06 respectively, since this connection reduces the lowest operating voltage of the comparator to Vth, when the voltage of the ac signal input to the rectifier circuit is lower than Vth, the lowest operating voltage of the comparator cannot be reached, therefore, the comparator cannot work normally, so that the rectifier circuit cannot work normally, that is, the rectifier in the prior art cannot work normally when the voltage of the alternating current signal input to the rectifier is less than Vth.

In order to solve the above problem, embodiments of the present invention provide a rectifier circuit and a rectifier, which can operate normally when the voltage of an ac signal input to the rectifier circuit is less than Vth. The rectifier circuit and the rectifier according to the embodiments of the present invention will be described in detail below.

As shown in fig. 2, an embodiment of the present invention provides a rectifier circuit, including: a bias module 11, a comparison module 12, an amplification module 13 and a rectifying transistor 14.

The power supply terminal 111 of the bias module 11 is connected to the Output terminal (Output in fig. 2) of the rectifier circuit, the Output terminal 112 of the bias module 11 is connected to the bias terminal 121 of the comparison module 12 and the bias terminal 131 of the amplification module 13, the first Input terminal 122 of the comparison module 12 is connected to the Input terminal (Input in fig. 2) of the rectifier circuit, the second Input terminal 123 of the comparison module 12 is connected to the Output terminal of the rectifier circuit, the Output terminal 124 of the comparison module 12 is connected to the Input terminal 132 of the amplification module 13, the power supply terminal 133 of the amplification module 13 is connected to the Output terminal of the rectifier circuit, the Output terminal 134 of the amplification module 13 is connected to the gate of the rectifier transistor 14, the source of the rectifier transistor 14 is connected to the Input terminal of the rectifier circuit, and.

The bias module 11 is configured to provide a bias voltage to the comparison module 12 and the amplification module 13, where the bias voltage is smaller than a threshold voltage of the transistor; a comparison module 12 for comparing an input voltage at an input end of the rectification circuit with an output voltage at an output end of the rectification circuit, and outputting a control signal to the amplification module 13 according to a comparison result; and the amplifying module 13 is configured to amplify the control signal, and output the amplified control signal to the gate of the rectifying transistor 14 to control the rectifying transistor 14 to be turned on or turned off.

The threshold voltage of the transistor is generally determined by the manufacturing process conditions of the transistor. Illustratively, when the manufacturing process conditions of the transistors used in the rectifier circuit and the rectifier provided by the embodiment of the invention are standard 0.18um CMOS process, the threshold voltage of the transistors is usually about 500 mV.

According to the rectifying circuit provided by the embodiment of the invention, the bias voltage is provided for the comparison module and the amplification module through the bias module, so that the comparison module can compare the input voltage of the input end of the rectifying circuit with the output voltage of the output end of the rectifying circuit under the bias of the bias voltage, and output a control signal to the amplification module according to the comparison result, then the amplification module amplifies the control signal output by the comparison module, and outputs the amplified control signal to the grid electrode of the rectifying transistor so as to control the switching-on or switching-off of the rectifying transistor, and therefore, the rectifying circuit is controlled to rectify the alternating current signal input by the input end of the rectifying circuit. In the rectifier circuit, because the bias voltage provided by the bias module for the comparison module and the amplification module is less than the threshold voltage of the transistor, the comparison module and the amplification module in the rectifier circuit can also work normally under the condition that the input voltage of the input end of the rectifier circuit is less than the threshold voltage of the transistor, thereby ensuring that the rectifier circuit can work normally under the condition that the input voltage of the input end of the rectifier circuit is less than the threshold voltage of the transistor.

Optionally, the rectifying transistor 14 in the embodiment of the present invention may be a P-channel Metal Oxide Semiconductor (MOS) transistor.

Optionally, in the embodiment of the present invention, when the input voltage of the input end of the rectifying circuit is greater than the output voltage of the output end of the rectifying circuit, the control signal output by the comparing module is a low level signal. When the input voltage of the input end of the rectifying circuit is smaller than the output voltage of the output end of the rectifying circuit, the control signal output by the comparing module is a high level signal.

Optionally, in the embodiment of the present invention, since the amplitude variation of the control signal output by the comparing module is relatively small, after the output end of the comparing module outputs the control signal, in order to ensure a control effect of the control signal on the rectifying transistor (if the amplitude variation of the control signal is too small, the control signal may not accurately and quickly control the rectifying transistor to be completely turned on or turned off), the control signal may be amplified by the amplifying module, so that the amplitude variation of the control signal is relatively large (if the amplitude variation of the control signal is relatively large, the control signal may accurately and quickly control the rectifying transistor to be completely turned on or turned off).

In the rectifier circuit provided by the embodiment of the invention, when the rectifier transistor is completely conducted, the rectifier transistor operates in a linear region, and the voltage drop of the rectifier transistor is the voltage difference between the drain and the source of the rectifier transistor at this time, and the voltage difference between the drain and the source of the rectifier transistor is usually tens of millivolts, so that the voltage drop of the rectifier transistor is relatively small, the loss of the rectifier circuit is relatively small, and the voltage conversion efficiency is relatively high.

As shown in fig. 2, the substrate 141 of the rectifying transistor 14 in the rectifying circuit according to the embodiment of the present invention is connected to the output terminal of the rectifying circuit, so that a substrate parasitic diode 142 is formed between the input terminal of the rectifying circuit and the output terminal of the rectifying circuit. When the rectifier circuit starts, the input voltage of the input end of the rectifier circuit is larger than the output voltage of the output end of the rectifier circuit, so that the current in the rectifier circuit flows from the input end of the rectifier circuit to the output end of the rectifier circuit through the substrate parasitic diode 142, and the rectifier circuit starts smoothly. Compared with the prior art which is shown in fig. 1 and needs to start the rectifying circuit through the transistor M02 when starting, the structure of the rectifying circuit is simplified, and the area of the rectifying circuit is saved.

Further, as shown in fig. 2, the rectifier circuit provided by the embodiment of the present invention, since the substrate 141 of the rectifier transistor 14 is connected to the output terminal of the rectifier circuit, and the rectifying circuit provided by the embodiment of the invention has less loss under the condition that the rectifying transistor 14 is completely conducted, therefore, the output voltage of the output end of the rectifying circuit provided by the embodiment of the invention is larger (namely close to the maximum value of the input voltage of the input end of the rectifying circuit), thereby, it is possible to ensure that the substrate 141 of the rectifying transistor 14 is always at a high potential, compared with the substrate of the transistor M01 controlled by the substrate regulator in the rectifying circuit provided in the prior art as shown in fig. 1, the rectifier circuit provided by the embodiment of the invention does not need to design the circuit structure of the substrate regulator part, so that the structure of the rectifier circuit can be further simplified, and the area of the rectifier circuit is saved.

The power supply terminal of the bias module in the rectifier circuit provided by the embodiment of the invention is connected with the output terminal of the rectifier circuit, when the rectifier circuit starts to start, the voltage difference between the input voltage of the input terminal of the rectifier circuit and the output voltage of the output terminal of the rectifier circuit can conduct the substrate parasitic diode of the rectifier transistor, so that the alternating current signal to be rectified can flow from the input terminal of the rectifier circuit to the output terminal of the rectifier circuit through the substrate parasitic diode, after the alternating current signal to be rectified flows to the output terminal of the rectifier circuit, the output terminal of the rectifier circuit can provide the power supply voltage for the bias module to enable the bias module to start working, and provide the bias voltage for the comparison module and the amplification module through the bias module, so that the comparison module can compare the input voltage of the input terminal of the rectifier circuit with the output voltage of the output, then, the amplifying module may amplify the control signal output by the comparing module, and output the amplified control signal to the gate of the rectifying transistor to control the switching on or off of the rectifying transistor, so as to control the rectifying circuit to rectify the ac signal input by the input terminal of the rectifying circuit.

It should be noted that, in the embodiment of the present invention, the first input terminal of the comparison module may also be understood as a first power supply terminal of the comparison module, and the second input terminal of the comparison module may also be understood as a second power supply terminal of the comparison module, that is, in the embodiment of the present invention, the input terminal of the rectifier circuit and the output terminal of the rectifier circuit may provide a power supply voltage for the comparison module.

Optionally, with reference to fig. 2, as shown in fig. 3, the bias module 11 in the rectifier circuit according to the embodiment of the present invention includes a first resistor R1, a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, and a sixth transistor M6, one end of the first resistor R1 is a power source terminal 111 of the bias module 11, and a drain of the fifth transistor M5 is an output terminal 112 of the bias module 11.

One end of the first resistor R1 is connected with the output end of the rectifying circuit, the source of the fourth transistor M4 and the source of the fifth transistor M5, and the other end of the first resistor R1 is connected with the gate of the first transistor M1 and the gate of the second transistor M2; the drain of the first transistor M1 is connected to the gate of the first transistor M1, and the source of the first transistor M1 is connected to the drain of the second transistor M2 and the gate of the third transistor M3; the source of the second transistor M2 is grounded (denoted as GND in fig. 3); the drain of the third transistor M3 is connected to the drain of the fourth transistor M4, and the source of the third transistor M3 is grounded; the gate of the fourth transistor M4 is connected to the drain of the fourth transistor M4 and the gate of the fifth transistor M5; the drain of the fifth transistor M5 is connected to the drain of the sixth transistor M6 and the gate of the sixth transistor M6, and the source of the sixth transistor M6 is grounded.

Alternatively, the first transistor M1, the second transistor M2, the third transistor M3, and the sixth transistor M6 shown in fig. 3 provided by the embodiment of the present invention may be N-channel MOS transistors, and the fourth transistor M4 and the fifth transistor M5 in fig. 3 may be P-channel MOS transistors.

As shown in fig. 3, the output terminal of the rectifying circuit provided by the embodiment of the present invention is connected to the first resistor R1 in the bias module 11, the resistance of the first resistor R1 is relatively large, and the first resistor R1, the first transistor M1 and the second transistor M2 are connected in series, so that after the output voltage at the output terminal of the rectifying circuit is divided by the first resistor R1, the voltage at the gate of the first transistor M1 (i.e. point a in fig. 3) can be biased to the threshold voltage of the transistor (which may be biased to be close to the threshold voltage of the transistor in practical application), the threshold voltage is divided by the first transistor M1, so that the voltage at the source of the first transistor M1 (i.e. point b in fig. 3) is smaller than the threshold voltage, and then the mirror circuit formed by the third transistor M3, the fourth transistor M4, the fifth transistor M5 and the sixth transistor M6 amplifies the voltage at point b, the amplified voltage at the point b is output from the drain of the fifth transistor M5 (i.e., the point c in fig. 3) to the bias terminal 121 of the comparison module 12 and the bias terminal 131 of the amplification module 13, and since the voltage at the point c is smaller than the threshold voltage of the transistor, the bias voltages of the comparison module and the amplification module in the rectifier circuit provided in the embodiment of the present invention are both smaller than the threshold voltage of the transistor, so that the comparison module and the amplification module in the rectifier circuit provided in the embodiment of the present invention can still normally operate under the condition that the input voltage at the input terminal of the rectifier circuit is smaller than the threshold voltage of the transistor, thereby ensuring that the rectifier circuit provided in the embodiment of the present invention can normally operate under the condition that the input voltage at the input terminal of the rectifier circuit is smaller than the threshold voltage of the transistor.

In the embodiment of the present invention, the resistance of the first resistor R1 is set to bias the voltage at the point a shown in fig. 3 to the threshold voltage of the transistor. Specifically, the resistance of the first resistor R1 may be set according to practical requirements, and the invention is not limited thereto.

In the embodiment of the present invention, as shown in fig. 3, since the series connection of the first transistor M1 and the second transistor M2 makes the gate-drain voltage of M2 of the second transistor greater than the gate-drain voltage of the first transistor M1, in order to keep the current balance of the branch where the first transistor M1 and the second transistor M2 are located (i.e. the branch formed by the source of the drain-M2 of the drain-M1 of M1), the voltage at the point b is usually much smaller than the threshold voltage of the transistor, if the voltage at the point b is directly input to the offset terminals of the comparing module and the amplifying module as the offset voltage, the comparing module and the amplifying module cannot normally operate because the offset voltage is too small, and in order to ensure that the comparing module and the amplifying module normally operate, the voltage at the point b may be amplified and then input to the comparing module and the amplifying module. In the rectifier circuit provided in the embodiment of the present invention, it is necessary to ensure that the bias voltage provided by the bias module is less than the threshold voltage of the transistor, so that the voltage value obtained by amplifying the voltage at the point b should be less than the threshold voltage of the transistor.

Optionally, with reference to fig. 3, as shown in fig. 4, the comparison module 12 in the rectification circuit provided in the embodiment of the present invention includes: a seventh transistor M7, an eighth transistor M8, a ninth transistor M9 and a tenth transistor M10, wherein the gate of the ninth transistor M9 is the bias terminal 121 of the comparison module 12, the source of the seventh transistor M7 is the first input terminal 122 of the comparison module 12, the source of the eighth transistor M8 is the second input terminal 133 of the comparison module 12, and the drain of the eighth transistor M8 is the output terminal 134 of the comparison module 12.

A gate of the seventh transistor M7 is connected to a drain of the seventh transistor M7, a gate of the eighth transistor M8 and a drain of the ninth transistor M9, and a source of the seventh transistor M7 is connected to an Input of the rectifier circuit; the drain of the eighth transistor M8 is connected to the drain of the tenth transistor M10, and the source of the eighth transistor M8 is connected to the Output of the rectifier circuit Output; the gate of the ninth transistor M9 is connected to the gate of the tenth transistor M10, and the source of the ninth transistor M9 and the source of the tenth transistor M10 are grounded.

Alternatively, the seventh transistor M7 and the eighth transistor M8 shown in fig. 4 provided by the embodiment of the present invention may be P-channel MOS transistors, and the ninth transistor M9 and the tenth transistor M10 in fig. 4 may be N-channel MOS transistors.

Since the rectifier circuit provided by the prior art as shown in fig. 1 adopts a substrate input form, that is, the substrate of M05 in fig. 1 is connected with the input end of the rectifier circuit, the source of M05 is connected with the output end of the rectifier circuit, the input voltage at the input end of the rectifier circuit is smaller than the output voltage at the output end of the rectifier circuit, and the voltage difference between the output voltage at the output end of the rectifier circuit and the input voltage at the input end of the rectifier circuit can turn on the substrate parasitic diode of M05 (the positive electrode of the substrate parasitic diode of M05 is connected with the source of M05, and the negative electrode of the substrate parasitic diode of M05 is connected with the substrate of M05), the current in the rectifier circuit can flow from the output end of the rectifier circuit to the input end of the rectifier circuit through the substrate parasitic diode of M05. In the rectifier circuit shown in fig. 4 provided in the embodiment of the present invention, since the comparison module 12 adopts a source input form, that is, the source and the substrate of M7 are both connected to the input terminal of the rectifier circuit, even if the input voltage at the input terminal of the rectifier circuit is smaller than the output voltage at the output terminal of the rectifier circuit, the current of the rectifier circuit cannot flow from the output terminal of the rectifier circuit to the input terminal of the rectifier circuit through the substrate parasitic diode of M7 (the anode of the substrate parasitic diode of M7 is connected to the source of M7, and the cathode of the substrate parasitic diode of M7 is connected to the substrate of M7), that is, no reverse current is generated. Therefore, compared with the rectifier circuit shown in fig. 1 provided in the prior art, the rectifier circuit shown in fig. 4 provided in the embodiment of the present invention can still operate normally when the input voltage at the input end of the rectifier circuit is large, and the range of the input voltage at the input end of the rectifier circuit is expanded.

For example, in the case where the manufacturing process condition of the transistor is the standard 0.18um CMOS process condition, in the rectifier circuit shown in fig. 1, when the input voltage at the input end of the rectifier circuit is generally greater than 700mV, the voltage at the input end of the rectifier circuit may be smaller than the voltage at the output end of the rectifier circuit, which may cause the output voltage at the output end of the rectifier circuit to flow back to the input end of the rectifier circuit, so the rectifier circuit in the prior art shown in fig. 1 may not operate normally when the output voltage at the output end of the rectifier circuit is greater than 700mV, and therefore the maximum operating voltage of the rectifier circuit shown in fig. 1 is generally 700 mV. The working voltage of the rectifying circuit provided by the embodiment of the invention is not limited by the input voltage of the input end of the rectifying circuit, and similarly, under the condition that the manufacturing process condition of the transistor is the standard 0.18um CMOS process condition, the maximum working voltage of the rectifying circuit provided by the embodiment of the invention can be 1.8V under the process condition generally. Therefore, the rectifier circuit provided by the embodiment of the invention enlarges the range of the input voltage of the input end of the rectifier circuit.

In the embodiment of the present invention, in the comparison module 12 of the rectifier circuit shown in fig. 4, when the input voltage (i.e., Vin) at the input end of the rectifier circuit is equal to the output voltage (Vout) at the output end of the rectifier circuit, that is, when Vin is equal to Vout, the voltage at the point d may be regarded as an intermediate voltage (for example, in practical applications, when the voltage at the point d is greater than the intermediate voltage, the voltage at the point d may be regarded as a high level, and when the voltage at the point d is less than the intermediate voltage, the voltage at the point d may be regarded as a low level).

In the embodiment of the present invention, when Vin is greater than Vout, the voltage of the drain of the seventh transistor M7 increases, the voltage of the drain of the seventh transistor M7 also increases, since the drain of the seventh transistor M7 is connected to the gate of the eighth transistor M8, the voltage of the gate of the eighth transistor M8 increases, and since the eighth transistor M8 and the tenth transistor M10 form a common source amplifying circuit, the voltage of the drain of the eighth transistor M8 (i.e., the voltage at the point d) decreases, that is, when Vin is greater than Vout, the comparing module 12 outputs a low level. When Vin is greater than Vout, the voltage at the drain of the eighth transistor M8 (i.e., the voltage at the point d) increases as Vin decreases, i.e., when Vin gradually decreases and reaches the minimum value, the voltage at the point d increases to the maximum value.

When Vin is less than Vout, the voltage of the drain of the seventh transistor M7 is decreased, the voltage of the drain of the 7 th transistor M7 is also decreased, the voltage of the gate of the eighth transistor M8 is decreased because the drain of the seventh transistor M7 is connected to the gate of the eighth transistor M8, and the voltage of the drain of the eighth transistor M8 (i.e., the voltage at point d) is increased because the eighth transistor M8 and the tenth transistor M10 form a common-source amplifying circuit structure, i.e., when Vin is less than Vout, the comparing module 12 outputs a high level. Here, when Vin is smaller than Vout, the voltage of the drain of the eighth transistor M8 (i.e., the voltage at the point d) decreases as Vin increases, and when Vin gradually increases and reaches the maximum value, the voltage at the point d decreases to the minimum value.

Optionally, with reference to fig. 4, as shown in fig. 5, the amplifying module 13 in the rectifying circuit according to the embodiment of the present invention includes: an eleventh transistor M11, a twelfth transistor M12, a thirteenth transistor M13 and a fourteenth transistor M14, wherein the gate of the thirteenth transistor M11 is the bias terminal 131 of the amplifying block 13, the gate of the eleventh transistor M11 is the input terminal 132 of the amplifying block 13, the source of the eleventh transistor M11 is the power source terminal 133 of the amplifying block 13, and the drain of the twelfth transistor M12 is the output terminal 134 of the amplifying block 13.

A gate of the eleventh transistor M11 is connected to the Output terminal 124 of the comparison module 12, a drain of the eleventh transistor M11 is connected to a gate of the twelfth transistor M12 and a drain of the thirteenth transistor M13, and a source of the eleventh transistor M11 is connected to an Output of the rectification circuit Output and a source of the twelfth transistor M12; a drain of the twelfth transistor M12 is connected to a drain of the fourteenth transistor M14; the gate of the thirteenth transistor M13 is connected to the output terminal 112 of the bias module 11 and the gate of the fourteenth transistor M14, and the source of the thirteenth transistor M13 and the source of the fourteenth transistor M14 are grounded.

Alternatively, the eleventh transistor M11 and the twelfth transistor M12 shown in fig. 5 provided by the embodiment of the present invention may be P-channel MOS transistors, and the thirteenth transistor M13 and the fourteenth transistor M14 in fig. 5 may be N-channel MOS transistors.

In the rectifier circuit shown in fig. 5, the thirteenth transistor M13 and the fourteenth transistor M14 in the amplifying module 13 respectively provide stable current for the branch where the eleventh transistor M11 and the thirteenth transistor M13 are located (i.e. the branch where the source of the eleventh transistor M11-the drain of the eleventh transistor M11-the drain of the thirteenth transistor M13-the source of the thirteenth transistor M13) and the branch where the twelfth transistor M12 and the fourteenth transistor M14 are located (i.e. the branch where the source of the twelfth transistor M12-the drain of the twelfth transistor M12-the drain of the fourteenth transistor M14-the source of the fourteenth transistor M14) under the bias of the bias voltage of the amplifying module, and because the bias voltage is small (i.e. smaller than the threshold voltage of the transistors), under the bias voltage, the current flowing through the branch where the eleventh transistor M11 and the thirteenth transistor M13 are located and the branch where the twelfth transistor M12 and the fourteenth transistor M14 are located are always maintained within a relatively small range, and when the control signal V03 output by the comparison module in the comparator shown in fig. 1 is switched (i.e., the control signal V03 is switched from high level to low level or the control signal V03 is switched from low level to high level) by using the four-stage inverter driver in the comparator in the prior art, the current of each branch in the four-stage inverter driver shown in fig. 1 (each branch in the four-stage inverter driver is not shown in fig. 1) is increased instantaneously, the power consumption of the four-stage inverter driver is also increased along with the increase of the current of each branch, so that the power consumption of the amplifying module 13 provided in the embodiment of the present invention is smaller than that of the four-stage inverter driver in the prior art, the power consumption of the rectifier circuit is reduced.

In the rectifier circuit shown in fig. 5 provided by the embodiment of the present invention, the eleventh transistor M11, the twelfth transistor M12, the thirteenth transistor M13 and the fourteenth transistor M14 in the amplifying module 13 constitute a two-stage amplifying circuit. The eleventh transistor M11 and the thirteenth transistor M13 form a first stage amplifying circuit; the twelfth transistor M12 and the thirteenth transistor M14 form a second stage of amplifying circuit, and the two stage of amplifying circuit is used for amplifying the control signal output by the comparing module 12 and outputting the amplified control signal to the rectifying transistor 14 to control the on/off of the rectifying transistor 14.

Specifically, in the embodiment of the present invention, when the control signal output by the comparing module 12 is at a low level, the first-stage amplifying circuit of the amplifying module 13 performs inverse amplification on the control signal at the low level, and then outputs a control signal at a high level, and then the second-stage amplifying circuit of the amplifying module 13 performs inverse amplification on the control signal at the high level, and finally the amplifying module 13 outputs a control signal at a low level. When the control signal output by the comparing module 12 is at a high level, the first-stage amplifying circuit of the amplifying module 13 reversely amplifies the control signal at the high level, and then outputs a control signal at a low level, and the second-stage amplifying circuit of the amplifying module 13 reversely amplifies the control signal at the low level, and finally the amplifying module 13 outputs the control signal at the high level.

Optionally, the amplifying module in the rectifying circuit provided in the embodiment of the present invention may also be an even-numbered stage amplifying circuit such as a four-stage amplifying circuit and a six-stage amplifying circuit, which may be specifically set according to actual needs, and the present invention is not limited.

It should be noted that, since each stage of the amplifying circuit in the amplifying module in the embodiment of the present invention is reversely amplified, the amplifying module generally includes an even number of stages of amplifying circuits, such as the above-mentioned two-stage amplifying circuit, four-stage amplifying circuit, or six-stage amplifying circuit.

Optionally, with reference to fig. 5, as shown in fig. 6, the rectifier circuit according to the embodiment of the present invention may further include a start module 15, where a power supply terminal 151 of the start module 15 is connected to an Input terminal of the rectifier circuit, an Input terminal 152 of the start module 15 is connected to an Output terminal Output of the rectifier circuit, and an Output terminal 153 of the start module 15 is connected to the offset terminal 121 of the comparison module 12 and the offset terminal 131 of the amplification module 13.

And the starting module 15 is used for providing bias voltage for the comparison module 12 and the amplification module 13 under the condition that the Output end Output of the rectifying circuit has no Output voltage.

In the rectifier circuit shown in fig. 6 provided in the embodiment of the present invention, a power supply terminal of the bias module 11 is connected to an output terminal of the rectifier circuit, that is, the output terminal of the rectifier circuit provides a bias voltage for the bias module, when the rectifier circuit starts, that is, when the output terminal of the rectifier circuit does not normally output, the bias module may not normally operate, the bias module may not provide the bias voltage for the comparison module and the amplification module, and at this time, in order to ensure that the rectifier circuit can be normally started, the start module 15 may be controlled to temporarily provide the bias voltage for the comparison module 12 and the amplification module 13. After the rectifier circuit is started, i.e. in the case of normal output at the output end of the rectifier circuit, Vout can control the start module 15 to stop working (a specific method for controlling the start module 15 to stop working will be described in detail in the following embodiments), so that the bias module 11 provides the bias voltage for the comparison module 12 and the amplification module 13. Thus, the rectifier circuit provided by the embodiment of the invention can temporarily provide bias voltage for the comparison module 12 and the amplification module 13 by the starting module when the rectifier circuit starts to start, namely Vout is equal to 0; after the rectifying circuit is started, namely under the condition that the output end of the rectifying circuit outputs normally, the bias module 11 provides bias voltage for the comparison module 12 and the amplification module 13, so that the normal work of the rectifying circuit is ensured.

Optionally, with reference to fig. 6 and as shown in fig. 7, the starting module 15 in the rectifying circuit according to the embodiment of the present invention may include a fifteenth transistor M15, a source of the fifteenth transistor M15 is a power supply terminal 151 of the starting module 15, and a drain of the fifteenth transistor M15 is an output terminal 152 of the starting module 15.

The gate of the fifteenth transistor M15 is connected to the Output terminal Output of the rectifying circuit, the drain of the fifteenth transistor M15 is connected to the bias terminal 121 of the comparing module 12 and the bias terminal 131 of the amplifying module 13, and the source of the fifteenth transistor M15 is connected to the Input terminal Input of the rectifying circuit.

Optionally, the fifteenth transistor M15 shown in fig. 6 provided in the embodiment of the present invention may be a P-channel MOS transistor.

In the rectifier circuit shown in fig. 7 provided in the embodiment of the present invention, a specific method for controlling the start module 15 to stop working may be that, when the rectifier circuit starts to start, that is, in the case where there is no normal output at the output terminal of the rectifier circuit, the gate of the fifteenth transistor M15 is at a low level, the fifteenth transistor M15 is turned on, so that the voltage Vin at the input terminal of the rectifying circuit can be output to the bias terminal 121 of the comparing module 12 and the bias terminal 131 of the amplifying module 13 through the fifteenth transistor M15, i.e. the start-up block 15 temporarily supplies the comparison block 12 and the amplification block 13 with bias voltages which, after start-up of the circuit, that is, in the case of normal output at the output terminal of the rectifier circuit, the gate of the fifteenth transistor M15 is at a high level, the fifteenth transistor M15 is turned off, i.e. the start module 15 stops working, the bias module 11 provides bias voltage for the comparison module 12 and the amplification module 13.

Optionally, with reference to fig. 7, as shown in fig. 8, the rectifier circuit according to the embodiment of the present invention may further include a voltage stabilizing capacitor C1, one end of the voltage stabilizing capacitor C1 is connected to the output terminal 112 of the bias module 11 and the output terminal 152 of the start module 15, and the other end of the voltage stabilizing capacitor C1 is grounded.

It should be noted that, in the embodiment of the present invention, the voltage stabilizing capacitor C1 in the rectifying circuit shown in fig. 8 may be used to store the voltage at the point C to stabilize the voltage at the output terminal 152 of the start module 15 when the start module 15 provides the offset voltage for the comparing module and the amplifying module.

As shown in fig. 9, the embodiment of the present invention provides a rectifier, which includes a first rectifying circuit D1 and a filter capacitor C2, where the first rectifying circuit may be the rectifying circuit in fig. 8, one end of the filter capacitor C2 is connected to the output end of the first rectifying circuit, and the other end of the filter capacitor C2 is grounded.

Alternatively, as shown in fig. 9, in the case that the Input voltage of the Input terminal (denoted as Input1 in fig. 9) of the first rectification circuit D1 is greater than the Output voltage of the Output terminal (denoted as Output1 in fig. 9) of the first rectification circuit, the gate of the rectification transistor 14 is at a low level, the rectification transistor 14 is turned on, and the current in the first rectification circuit D1 flows from the Input terminal of the first rectification circuit D1 to the Output terminal of the first rectification circuit D1, at which time the filter capacitor C2 is charged. When the voltage at the input terminal of the first rectifier circuit D1 is lower than the voltage at the output terminal of the first rectifier circuit, the gate of the rectifier transistor 14 is at a high level, and the rectifier transistor 14 is turned off, so that the current in the first rectifier circuit D1 is prevented from flowing from the output terminal of the first rectifier circuit D1 to the input terminal of the first rectifier circuit D1, and the filter capacitor C2 is discharged.

It should be noted that, in the rectifier shown in fig. 9 provided in the embodiment of the present invention, an input end of the rectifier is an input end of the first rectifying circuit D1, and an output end of the rectifier is an output end of the first rectifying circuit D1.

The rectifier provided by the embodiment of the invention comprises a rectifying circuit (namely the first rectifying circuit) and a filter capacitor, wherein a bias module in the rectifying circuit provides bias voltage for a comparison module and an amplification module, so that the comparison module can compare the input voltage of the input end of the rectifying circuit with the output voltage of the output end of the rectifying circuit and output a control signal to the amplification module according to the comparison result, then the amplification module can amplify the control signal output by the comparison module and output the amplified control signal to the grid electrode of a rectifying transistor so as to control the switching-on or switching-off of the rectifying transistor, thereby controlling the rectifying circuit to rectify an alternating current signal input by the input end of the rectifying circuit and convert the rectified alternating current signal into a direct current signal after filtering the rectified alternating current signal by the filter capacitor; and because the bias voltage provided by the bias module for the comparison module and the amplification module is less than the threshold voltage of the transistor, the comparison module and the amplification module in the rectification circuit provided by the embodiment of the invention can normally work under the condition that the input voltage of the input end of the rectification circuit is less than the threshold voltage of the transistor, so that the rectification circuit provided by the embodiment of the invention can normally work under the condition that the input voltage of the input end of the rectification circuit is less than the threshold voltage of the transistor, namely, the rectifier provided by the embodiment of the invention can normally work under the condition that the input voltage of the input end of the rectifier is less than the threshold voltage of the transistor.

Optionally, the rectifier according to the embodiment of the present invention further includes a negative voltage converter, and an output terminal of the negative voltage converter is connected to an input terminal of the first rectifying circuit. The input end of the negative voltage converter is used for inputting an alternating current signal to be rectified, the output end of the negative voltage converter is used for inputting the alternating current signal converted by the negative voltage converter into the input end of the first rectifying circuit, namely, the converted alternating current signal is rectified by the first rectifying circuit and then filtered by the filter capacitor and then output, namely, the output end of the rectifier outputs a direct current signal rectified by the alternating current signal to be rectified, so that the rectification of the alternating current signal to be rectified can be realized.

Optionally, with reference to fig. 9 and as shown in fig. 10, the rectifier according to the embodiment of the present invention further includes a second rectifying circuit D2 and an input control module 16, and the second rectifying circuit D2 may be the rectifying circuit in fig. 8.

An Input end (shown as Input1 in fig. 10) of the first rectifying circuit D1 and an Input end (shown as Input2 in fig. 10) of the second rectifying circuit D2 are connected with the Input control module 16, and an Output end of the first rectifying circuit D1 is connected with an Output end of the second rectifying circuit D2 (an Output end of the first rectifying circuit D1 and an Output end of the second rectifying circuit D2 are both shown as Output in fig. 10).

The input control module 16 is used for controlling the input end of the differential input signal input first rectifying circuit D1 to operate the first rectifying circuit D1 in a first time period, and controlling the input end of the differential input signal input second rectifying circuit D2 to operate the second rectifying circuit D2 in a second time period.

The differential input signal may be provided by the differential voltage source of fig. 10. Specifically, the differential voltage source may provide differential input signals to the first rectifier circuit D1 and the second rectifier circuit D2 via the first input signal V1 and the second input signal V2 (i.e., the first input signal V1 and the second input signal V2 form a differential input signal).

In the embodiment of the invention, the differential input signal is an alternating current signal to be rectified.

Specifically, when the first input signal V1 is greater than the second input signal V2, that is, when the differential input signal input at the input terminal of the rectifier is in a positive half-cycle (that is, a first time period), the input control module 16 controls the differential input signal to be input to the input terminal of the first rectifier circuit D1, so that the first rectifier circuit D1 operates; when the first input signal V1 is smaller than the second input signal V2, that is, when the differential input signal inputted by the rectifier is in a negative half cycle (that is, a second time period), the input control module 16 controls the differential input signal to be inputted to the input terminal of the second rectifying circuit D2, so that the second rectifying circuit operates; when the first input signal V1 is equal to the second input signal V2, the differential input signal is 0, and the rectifier is not operated.

It should be noted that, in the rectifier shown in fig. 10 according to the embodiment of the present invention, the input ends of the rectifier are the input ends of the first rectifying circuit D1 and the second rectifying circuit D2, and the output ends of the rectifier are the output ends of the first rectifying circuit D1 and the second rectifying circuit D2.

The rectifier provided by the embodiment of the invention can control the differential input signal to be input into the input end of the first rectifying circuit in a first time period through the input control module so as to enable the first rectifying circuit to work, and can control the differential input signal to be input into the input end of the first rectifying circuit through the input control module, controlling the differential input signal to be input into the input end of the second rectifying circuit in a first time period so as to control the second rectifying circuit to work, thereby controlling the first rectifying circuit in the rectifier to rectify the differential input signal when the differential input signal inputted to the input terminal of the rectifier is in a positive half period, and controlling a second rectifying circuit in the rectifier to rectify the differential input signal when the differential input signal input at the input terminal of the rectifier is in a negative half cycle, and filtering the alternating current signal rectified by the first rectifying circuit or the second rectifying circuit through a filter capacitor so as to convert the alternating current signal into a direct current signal.

The rectifier provided by the embodiment of the invention comprises a rectifying circuit (namely a first rectifying circuit and a second rectifying circuit), an input control module and a filter capacitor, wherein, the bias module in the rectification circuit provides bias voltage for the comparison module and the amplification module, so that the comparison module can compare the input voltage of the input end of the rectification circuit with the output voltage of the output end of the rectification circuit and output a control signal to the amplification module according to the comparison result, then the amplifying module can amplify the control signal output by the comparing module and output the amplified control signal to the gate of the rectifying transistor to control the on/off of the rectifying transistor, the rectifying circuit is controlled to rectify an alternating current signal input by the input end of the rectifying circuit, and the rectified alternating current signal of the rectifying circuit is filtered by the filter capacitor to be converted into a direct current signal; and because the bias voltage provided by the bias module for the comparison module and the amplification module is less than the threshold voltage of the transistor, the comparison module and the amplification module in the rectification circuit can normally work under the condition that the input voltage of the input end of the rectification circuit is less than the threshold voltage of the transistor, thereby ensuring that the rectification circuit can normally work under the condition that the input voltage of the input end of the rectification circuit is less than the threshold voltage of the transistor, namely ensuring that the rectifier provided by the embodiment of the invention can normally work under the condition that the input voltage of the input end of the rectifier is less than the threshold voltage of the transistor

Optionally, with reference to fig. 10, as shown in fig. 11, the input control module 16 in the rectifier according to the embodiment of the present invention includes: a sixteenth transistor M16 and a seventeenth transistor M17.

The gate of the sixteenth transistor M16 is connected to the Input terminal Input1 of the first rectifying circuit, the drain of the sixteenth transistor M16 is connected to the Input terminal Input2 of the second rectifying circuit, and the source of the sixteenth transistor M16 is grounded; the gate of the seventeenth transistor M17 is connected to the Input terminal Input2 of the second rectifying circuit, the drain of the seventeenth transistor M17 is connected to the Input terminal Input1 of the first rectifying circuit, and the source of the seventeenth transistor M17 is grounded.

It should be noted that, in the rectifier shown in fig. 11 provided in the embodiment of the present invention, the input ends of the rectifier are the input ends of the first rectifying circuit D1 and the second rectifying circuit D2, and the output ends of the rectifier are the output ends of the first rectifying circuit D1 and the second rectifying circuit D2.

Alternatively, the sixteenth transistor M16 and the seventeenth transistor M17 shown in fig. 11 provided by the embodiment of the present invention may be N-channel MOS transistors.

Specifically, when the first input signal is greater than the second input signal, that is, when the differential input signal input at the input end of the rectifier is in a positive half cycle (that is, a first time period), the sixteenth transistor is turned on, the seventeenth transistor is turned off, and the differential input signal is input at the input end of the first rectifying circuit, so that the first rectifying circuit operates, and at this time, no signal is input at the input end of the second rectifying circuit, and the second rectifying circuit does not operate; when the first input signal is smaller than the second input signal, namely the differential input signal input by the input end of the rectifier is in a negative half period (namely a second time period), the seventeenth transistor is conducted, the sixteenth transistor is cut off, and the differential input signal is input into the input end of the second rectifying circuit, so that the second rectifying circuit works, at the moment, no signal is input into the input end of the first rectifying circuit, and the first rectifying circuit does not work.

The rectifier provided by the embodiment of the invention can control the sixteenth transistor to be switched on and the seventeenth transistor to be switched off in the first time period, so that the first rectifying circuit in the rectifier can be controlled to rectify the differential input signal when the differential input signal input by the input end of the rectifier is in a positive half period, and control the seventeenth transistor to be switched on and the sixteenth transistor to be switched off in the second time period, so that the second rectifying circuit in the rectifier can be controlled to rectify the differential input signal when the differential input signal input by the input end of the rectifier is in a negative half period, and the alternating current signals rectified by the first rectifying circuit and the second rectifying circuit are filtered by the filter capacitor to be converted into the direct current signals.

The rectifier provided by the embodiment of the invention comprises a rectifying circuit (namely a first rectifying circuit and a second rectifying circuit), an input control module and a filter capacitor, wherein, the bias module in the rectification circuit provides bias voltage for the comparison module and the amplification module, so that the comparison module can compare the input voltage of the input end of the rectification circuit with the output voltage of the output end of the rectification circuit and output a control signal to the amplification module according to the comparison result, then the amplifying module can amplify the control signal output by the comparing module and output the amplified control signal to the gate of the rectifying transistor to control the on/off of the rectifying transistor, the rectifying circuit is controlled to rectify an alternating current signal input by the input end of the rectifying circuit, and the rectified alternating current signal of the rectifying circuit is filtered by the filter capacitor to be converted into a direct current signal; and because the bias voltage provided by the bias module for the comparison module and the amplification module is less than the threshold voltage of the transistor, the comparison module and the amplification module in the rectification circuit can also work normally under the condition that the input voltage of the input end of the rectification circuit is less than the threshold voltage of the transistor, so that the rectification circuit can work normally under the condition that the input voltage of the input end of the rectification circuit is less than the threshold voltage of the transistor, namely, the rectifier provided by the embodiment of the invention can work normally under the condition that the input voltage of the input end of the rectifier is less than the threshold voltage of the transistor.

It should be noted that, according to the operating characteristics of the MOS transistor, the substrate of the MOS transistor of the P channel needs to be at a high level; therefore, in the rectifier circuit and/or the rectifier provided in the embodiment of the present invention, the substrate of the rectifying transistor 14 (P-channel MOS transistor) is connected to the drain of the rectifying transistor 14, and the substrates of the P-channel MOS transistors (the third transistor M3, the fifth transistor M5, the seventh transistor M7, the eighth transistor M8, the eleventh transistor, the twelfth transistor 12, and the fifteenth transistor M15) other than the rectifying transistor 14 are connected to the source of the transistor, so as to ensure that the substrate of the P-channel MOS transistor is at a high level; the substrates of the N-channel MOS transistors (the first transistor M1, the second transistor M2, the fourth transistor M4, the sixth transistor M6, the ninth transistor M9, the tenth transistor M10, the thirteenth transistor M13, the fourteenth transistor M14, the sixteenth transistor M16, and the seventeenth transistor M17) are all connected to the source of the transistor, so as to ensure the low level at the substrate of the N-channel MOS transistor, and the specific connection manner of the substrates of the MOS transistors in the embodiment of the present invention refers to the rectifier circuit shown in fig. 2 to fig. 8 and the rectifier shown in fig. 11.

Optionally, the rectification circuit in the embodiment of the present invention may be used for full-wave rectification or half-wave rectification. Further, diodes or CMOS connected in the form of diodes in a circuit (such as a voltage doubling circuit or a charge pump circuit) for converting an ac signal into a dc signal in the prior art may be replaced with the rectifying circuit in the present application to form a new rectifier.

Embodiments of the present invention also protect an apparatus for collecting energy, which includes the rectifier, and in the process of collecting energy (for example, collecting vibration energy, electromagnetic wave energy, etc.) by using the apparatus, after converting the energy into an alternating current signal, the alternating current signal needs to be rectified by the rectifier and converted into a direct current signal after being filtered by a filter to be supplied to a load for use, so as to realize collection and utilization of the energy.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A rectifier circuit, comprising: the power supply end of the bias module is connected with the output end of the rectifying circuit, the output end of the bias module is connected with the bias end of the comparing module and the bias end of the amplifying module, the first input end of the comparing module is connected with the input end of the rectifying circuit, the second input end of the comparing module is connected with the output end of the rectifying circuit, the output end of the comparing module is connected with the input end of the amplifying module, the power supply end of the amplifying module is connected with the output end of the rectifying circuit, the output end of the amplifying module is connected with the grid electrode of the rectifying transistor, the source electrode of the rectifying transistor is connected with the input end of the rectifying circuit, and the drain electrode of the rectifying transistor is connected with the output end of the rectifying circuit;

the bias module is used for providing bias voltage for the comparison module and the amplification module, and the bias voltage is smaller than the threshold voltage of the transistor;

the comparison module is used for comparing the input voltage of the input end of the rectification circuit with the output voltage of the output end of the rectification circuit and outputting a control signal to the amplification module according to the comparison result;

the amplifying module is used for amplifying the control signal and outputting the amplified control signal to the grid of the rectifying transistor so as to control the on or off of the rectifying transistor.

2. The rectifier circuit of claim 1, wherein the bias module comprises: the bias module comprises a first resistor, a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor and a sixth transistor, wherein one end of the first resistor is a power supply end of the bias module, and a drain electrode of the fifth transistor is an output end of the bias module; wherein,

one end of the first resistor is connected with the output end of the rectifying circuit, the source electrode of the fourth transistor and the source electrode of the fifth transistor, and the other end of the first resistor is connected with the grid electrode of the first transistor and the grid electrode of the second transistor; the drain electrode of the first transistor is connected with the grid electrode of the first transistor, and the source electrode of the first transistor is connected with the drain electrode of the second transistor and the grid electrode of the third transistor; the source electrode of the second transistor is grounded; the drain electrode of the third transistor is connected with the drain electrode of the fourth transistor, and the source electrode of the third transistor is grounded; the grid electrode of the fourth transistor is connected with the drain electrode of the fourth transistor and the grid electrode of the fifth transistor; the drain electrode of the fifth transistor is connected with the drain electrode of the sixth transistor and the grid electrode of the sixth transistor, and the source electrode of the sixth transistor is grounded.

3. The rectifier circuit according to claim 1 or 2, wherein the comparison module comprises: a seventh transistor, an eighth transistor, a ninth transistor, and a tenth transistor, wherein a gate of the ninth transistor is a bias terminal of the comparison module, a source of the seventh transistor is a first input terminal of the comparison module, a source of the eighth transistor is a second input terminal of the comparison module, and a drain of the eighth transistor is an output terminal of the comparison module; wherein,

the grid electrode of the seventh transistor is connected with the drain electrode of the seventh transistor, the grid electrode of the eighth transistor and the drain electrode of the ninth transistor, and the source electrode of the seventh transistor is connected with the input end of the rectifying circuit; the drain electrode of the eighth transistor is connected with the drain electrode of the tenth transistor, and the source electrode of the eighth transistor is connected with the output end of the rectifying circuit; a gate of the ninth transistor is connected to a gate of the tenth transistor, and a source of the ninth transistor and a source of the tenth transistor are grounded.

4. The rectifier circuit according to claim 1 or 2, wherein the amplification module comprises: an eleventh transistor, a twelfth transistor, a thirteenth transistor, and a fourteenth transistor, wherein a gate of the thirteenth transistor is a bias terminal of the amplifying module, a gate of the eleventh transistor is an input terminal of the amplifying module, a source of the eleventh transistor is a second input power terminal of the amplifying module, and a drain of the twelfth transistor is an output terminal of the amplifying module; wherein,

a grid electrode of the eleventh transistor is connected with an output end of the comparison module, a drain electrode of the eleventh transistor is connected with a grid electrode of the twelfth transistor and a drain electrode of the thirteenth transistor, and a source electrode of the eleventh transistor is connected with an output end of the rectification circuit and a source electrode of the twelfth transistor; a drain of the twelfth transistor is connected to a drain of the fourteenth transistor; the gate of the thirteenth transistor is connected with the output end of the bias module and the gate of the fourteenth transistor, and the source of the thirteenth transistor and the source of the fourteenth transistor are grounded.

5. The rectifier circuit according to claim 1 or 2, wherein the rectifier circuit further comprises a start module, a power supply end of the start module is connected with an input end of the rectifier circuit, an input end of the start module is connected with an output end of the rectifier circuit, and an output end of the start module is connected with a bias end of the comparison module and a bias end of the amplification module;

the starting module is used for providing bias voltage for the comparison module and the amplification module under the condition that no output voltage exists at the output end of the rectification circuit.

6. The rectifier circuit according to claim 5, wherein the start-up module comprises a fifteenth transistor, a gate of the fifteenth transistor is an input terminal of the start-up module, a source of the fifteenth transistor is a power supply terminal of the start-up module, and a drain of the fifteenth transistor is an output terminal of the start-up module; wherein,

the grid electrode of the fifteenth transistor is connected with the output end of the rectifying circuit, the drain electrode of the fifteenth transistor is connected with the offset end of the comparison module and the offset end of the amplification module, and the source electrode of the fifteenth transistor is connected with the input end of the rectifying circuit.

7. The rectifier circuit according to claim 1 or 2, wherein the rectifier circuit further comprises a voltage stabilizing capacitor, one end of the voltage stabilizing capacitor is connected to the output end of the bias module and the output end of the start module, and the other end of the voltage stabilizing capacitor is grounded.

8. A rectifier comprising a first rectifying circuit and a filter capacitor, wherein the first rectifying circuit is a rectifying circuit as claimed in any one of claims 1 to 7, one end of the filter capacitor is connected to an output end of the first rectifying circuit, and the other end of the filter capacitor is grounded.

9. The rectifier according to claim 8, further comprising a second rectifying circuit and an input control module, wherein the second rectifying circuit is the rectifying circuit according to any one of claims 1 to 7, the input end of the first rectifying circuit and the input end of the second rectifying circuit are connected to the input control module, and the output end of the first rectifying circuit is connected to the output end of the second rectifying circuit;

the input control module is used for controlling a differential input signal to be input into the input end of the first rectifying circuit in a first time period so as to enable the first rectifying circuit to work, and controlling the differential input signal to be input into the input end of the second rectifying circuit in a second time period so as to enable the second rectifying circuit to work.

10. The rectifier of claim 9, wherein the input control module comprises: a sixteenth transistor and a seventeenth transistor; wherein,

the grid electrode of the sixteenth transistor is connected with the input end of the first rectifying circuit, the drain electrode of the sixteenth transistor is connected with the input end of the second rectifying circuit, and the source electrode of the sixteenth transistor is grounded; the grid electrode of the seventeenth transistor is connected with the input end of the second rectifying circuit, the drain electrode of the seventeenth transistor is connected with the input end of the first rectifying circuit, and the source electrode of the seventeenth transistor is grounded.