CN111869085A

CN111869085A - Rectifier, driving method thereof, chip and power equipment

Info

Publication number: CN111869085A
Application number: CN201880091474.8A
Authority: CN
Inventors: 黄冬其; 王鹏飞; 李汇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-06-30
Filing date: 2018-06-30
Publication date: 2020-10-30
Anticipated expiration: 2038-06-30
Also published as: WO2020000481A1; CN111869085B

Abstract

The application provides a rectifier, a driving method of the rectifier, a chip and power equipment, and relates to the technical field of electronics. The first bridge arm comprises a first upper bridge arm and a first lower bridge arm, the first upper bridge arm is coupled between the first input end and the voltage output end, and the first lower bridge arm is coupled between the first input end and the grounding end. Meanwhile, a first semiconductor switch is arranged on the first upper bridge arm. The first lower bridge arm is provided with a second semiconductor switch. The first inductor is arranged on the first upper bridge arm and is connected in series with the first semiconductor switch, or the first inductor is arranged on the first lower bridge arm and is connected in series with the second semiconductor switch. The rectifier has a first working mode and a second working mode, the first working mode is suitable for high working frequency, the second working mode is suitable for low working frequency, the rectifier can be switched to the first working mode or the second working mode according to actual requirements, and therefore the rectifier is suitable for different scenes, and the universality is high.

Description

Rectifier, driving method thereof, chip and power equipment

Technical Field

The present disclosure relates to the field of electronic technologies, and in particular, to a rectifier, a driving method thereof, a chip, and an electrical device.

Background

Wireless Power Transfer (WPT) is a technology for directly transmitting power in space without a wire. Currently, the WPT technology includes a magnetic induction technology based on tight coupling and a magnetic resonance technology based on loose coupling, wherein the magnetic induction technology is dominated by wireless charging alliance wpc (wireless Power consortium), and the magnetic resonance technology is dominated by wireless charging organization AirFuel. When the electric power equipment (including sending end equipment of the electric signal and receiving end equipment of the electric signal) works based on a magnetic induction technology, the working frequency of the electric power equipment is 100-205 KHz (kilohertz), and the spatial freedom degree of the sending end equipment and the receiving end equipment is small; when the power equipment works based on the magnetic resonance technology, the working frequency of the power equipment is 6.78MHz, and the spatial freedom of the transmitting end equipment and the receiving end equipment is larger. Currently, the same power device may support multiple operating modes to accommodate different operating frequencies, considering device compatibility and cost issues. Since the rectifier, which is used to convert ac power into dc power, is an indispensable part of the receiving-end apparatus, the rectifier needs to support a plurality of operation modes in order to reduce costs.

In the related art, the circuit structure of the rectifier is shown in fig. 1, and includes 2N-type Metal-Oxide-Semiconductor Field-Effect transistors (MOSFETs): m1 and M3, which are referred to as half bridge class D rectifiers. The N-type MOSFET is also called an NMOSFET. Referring to fig. 1, assuming that the current signal at the input AC is a sinusoidal current signal, 1 NMOSFET will be on and 1 NMOSFET will be off during each half cycle of the sinusoidal current signal, so that the rectifier can provide current to the load during each cycle of the sinusoidal current signal.

However, the operation mode of the rectifier is generally suitable for low operation frequency and has low universality.

Disclosure of Invention

The application provides a rectifier, a driving method thereof, a chip and power equipment, and can solve the problems that the current working mode of the rectifier is generally applicable to low working frequency and low in universality. The technical scheme is as follows:

in a first aspect, a rectifier is provided, the rectifier comprising: a first leg and a first inductor. The first bridge arm comprises a first upper bridge arm and a first lower bridge arm. The first upper bridge arm is coupled between the first input end and the voltage output end, and the first lower bridge arm is coupled between the first input end and the grounding end. The first upper bridge arm is provided with a first semiconductor switch, and the first semiconductor switch is used for switching on or off the first upper bridge arm. The first lower bridge arm is provided with a second semiconductor switch which is used for conducting or closing the first lower bridge arm. The first inductor is arranged on the first upper bridge arm and is connected in series with the first semiconductor switch, or the first inductor is arranged on the first lower bridge arm and is connected in series with the second semiconductor switch.

The rectifier has a first mode of operation adapted for high operating frequencies and a second mode of operation adapted for low operating frequencies. Illustratively, the first mode of operation is applicable to an operating frequency of 6.78 MHz; the second working mode is suitable for the working frequency of 100-205 KHz. Each operating mode corresponds to a WPT technique, for example, the first operating mode corresponds to a magnetic resonance technique and the second operating mode corresponds to a magnetic induction technique.

The rectifier that this application provided can possess the characteristics of half-bridge class E rectifier under first mode, is applicable to high operating frequency, possesses the characteristics of half-bridge class D rectifier under the second mode, is applicable to low operating frequency, and this rectifier can switch between first mode and second mode, and then adapts to different scenes.

In the present application, the semiconductor switch may be a single semiconductor switching device, or may be a semiconductor switching device having a semiconductor switching function including a plurality of circuit elements.

Optionally, the rectifier may further include a drive control circuit, and the rectifier has a first operation mode and a second operation mode under the control of the drive control circuit. The drive control circuit is used for: in a first working mode, when the first inductor is arranged on the first upper bridge arm, the first semiconductor switch is turned on to enable the first upper bridge arm to be always conducted, and the second semiconductor switch is periodically turned on or off; when the first inductor is arranged on the first lower bridge arm, the second semiconductor switch is turned on to enable the first lower bridge arm to be always conducted, and the first semiconductor switch is periodically turned on or turned off. And in a second working mode, the first semiconductor switch and the second semiconductor switch are started at different time intervals, so that one of the first upper bridge arm and the first lower bridge arm is switched on and the other is switched off in the same time interval.

In the first operation mode, the first inductor has a rectifying characteristic, and the on-resistance of the first semiconductor switch or the second semiconductor switch can be used as a part of the dc resistance of the first inductor, so that the half-bridge class E rectifier is provided, and the switching loss of the rectifier is small. In the second operation mode, the first inductor is a low-impedance path for the alternating current component in the electrical signal at the first input terminal, thus having the characteristic of a half-bridge class D rectifier.

Optionally, the rectifier may further include a first capacitor. The first inductor is arranged on the first upper bridge arm, and the first capacitor is arranged on the first lower bridge arm and is connected with the second semiconductor switch in parallel. The first capacitor and the first inductor form a resonant circuit to reduce harmonic distortion and Electromagnetic Interference (EMI) noise. Because the second semiconductor switch is connected with the first capacitor in parallel, the second semiconductor switch can adopt a smaller size, so that the problem that the whole size of the rectifier is larger due to the larger size of the second semiconductor switch is avoided, and the occupied space of the rectifier is reduced by connecting the second semiconductor switch with the first capacitor in parallel.

Optionally, the rectifier may further include a first capacitor. The first inductor is arranged on the first lower bridge arm, and the first capacitor is arranged on the first upper bridge arm and is connected with the first semiconductor switch in parallel. The first capacitor and the first inductor form a resonant circuit to weaken harmonic distortion and reduce EMI noise. Because first semiconductor switch connects in parallel has first electric capacity, so first semiconductor switch can adopt less size to avoided making the whole size of rectifier great because of first semiconductor switch's size is great, through for first semiconductor switch first electric capacity that connects in parallel, reduced the occupation space of rectifier.

Optionally, the rectifier may further include: the first alternating current signal switch module. The first alternating current signal switch module is connected with the first inductor in parallel and is connected with the driving control circuit. The drive control circuit is further configured to: and in a second working mode, the first alternating current signal switch module is started, so that the low-frequency component in the electric signal of the first input end passes through the first inductor, and the high-frequency component passes through the first alternating current signal switch module. And under the first working mode, the first alternating current signal switch module is closed.

This application is through first alternating current signal switch module for the high frequency component in the signal of telecommunication of first input passes through first alternating current signal switch module, and then has avoided the high frequency component to be hindered by first inductance, has eliminated the ringing phenomenon of reducing the amplitude that the voltage signal's of first input wave form appears, and then can guarantee the rectifier and normally work, improves the job stabilization nature of rectifier.

Optionally, the first ac signal switch module may include: a fifth semiconductor switch and a first bypass capacitor connected in series. Wherein, the fifth semiconductor switch is connected with a drive control circuit, and the drive control circuit is used for: and in a second working mode, the fifth semiconductor switch is started to start the first alternating current signal switch module. And in the first working mode, the fifth semiconductor switch is closed to close the first alternating current signal switch module.

Optionally, when the rectifier is a full bridge rectifier, the rectifier may further include a second bridge arm and a second inductor. The second bridge arm comprises a second upper bridge arm and a second lower bridge arm. The second upper bridge arm is coupled between the second input end and the voltage output end, and the second lower bridge arm is coupled between the second input end and the grounding end. A third semiconductor switch is arranged on the second upper bridge arm and used for switching on or off the second upper bridge arm; and a fourth semiconductor switch is arranged on the second lower bridge arm and used for switching on or off the second lower bridge arm. The arrangement of the first inductance and the second inductance corresponds to one of the following situations: the first inductor is arranged on the first upper bridge arm, and the second inductor is arranged on the second upper bridge arm and is connected with the third semiconductor switch in series; or the first inductor is arranged on the first lower bridge arm, and the second inductor is arranged on the second lower bridge arm and is connected with the fourth semiconductor switch in series.

Optionally, the rectifier may further include a drive control circuit, the rectifier having a first operation mode and a second operation mode under the control of the drive control circuit, the drive control circuit being configured to: in a first working mode, when a first inductor is arranged on a first upper bridge arm and a second inductor is arranged on a second upper bridge arm, a first semiconductor switch is started to enable the first upper bridge arm to be always conducted, a third semiconductor switch is started to enable the second upper bridge arm to be always conducted, and a second semiconductor switch and a fourth semiconductor switch are started at different time intervals to enable one of a first lower bridge arm and a second lower bridge arm to be conducted and the other one of the first lower bridge arm and the second lower bridge arm to be closed in the same time interval; when the first inductor is arranged on the first lower bridge arm and the second inductor is arranged on the second lower bridge arm, the second semiconductor switch is started to enable the first lower bridge arm to be always conducted, the fourth semiconductor switch is started to enable the second lower bridge arm to be always conducted, and the first semiconductor switch and the third semiconductor switch are started at different time intervals to enable one of the first upper bridge arm and the second upper bridge arm to be conducted and the other one of the first upper bridge arm and the second upper bridge arm to be closed in the same time interval. In the second working mode, the two semiconductor switch groups are started at different time intervals, so that one of the two bridge arm groups is conducted, and the other is closed in the same time interval. One of the two semiconductor switch groups comprises a third semiconductor switch and a second semiconductor switch, and the other semiconductor switch group comprises a first semiconductor switch and a fourth semiconductor switch. One of the two bridge arm sets comprises a first lower bridge arm and a second upper bridge arm, and the other bridge arm set comprises a second lower bridge arm and a first upper bridge arm.

In a first working mode, the first inductor and the second inductor have a rectifying characteristic, the first semiconductor switch and the third semiconductor switch are always on, or the second semiconductor switch and the fourth semiconductor switch are always on, and the full-bridge class E rectifier has the characteristic of a full-bridge class E rectifier. And the switching frequency of the rectifier is low, and the switching loss is small. In the second operation mode, the first inductor is a low-impedance path for the alternating current component in the electric signal of the first input end, and the second inductor is a low-impedance path for the alternating current component in the electric signal of the second input end, so that the full-bridge class D rectifier has the characteristics.

Optionally, the rectifier may further include a second capacitor and a third capacitor. The first inductor is arranged on the first upper bridge arm, the second inductor is arranged on the second upper bridge arm, the second capacitor is arranged on the first lower bridge arm and is connected with the second semiconductor switch in parallel, and the third capacitor is arranged on the second lower bridge arm and is connected with the fourth semiconductor switch in parallel. The second capacitor and the first inductor form a resonant circuit, the third capacitor and the second inductor form a resonant circuit, and the purpose of reducing EMI noise can be achieved through the resonant circuit.

Because the second semiconductor switch is connected with the second capacitor in parallel, and the fourth semiconductor switch is connected with the third capacitor in parallel, the second semiconductor switch and the fourth semiconductor switch can adopt smaller sizes, so that the problem that the whole size of the rectifier is larger due to the larger sizes of the second semiconductor switch and the fourth semiconductor switch is solved, and the occupied space of the rectifier is reduced.

Optionally, the rectifier may further include a second capacitor and a third capacitor. The first inductor is arranged on the first lower bridge arm, the second inductor is arranged on the second lower bridge arm, the second capacitor is arranged on the first upper bridge arm and is connected with the first semiconductor switch in parallel, and the third capacitor is arranged on the second upper bridge arm and is connected with the third semiconductor switch in parallel. The second capacitor and the first inductor form a resonant circuit, the third capacitor and the second inductor form a resonant circuit, and the purpose of reducing EMI noise can be achieved through the resonant circuit.

Because the first semiconductor switch is connected with the second capacitor in parallel, and the third semiconductor switch is connected with the third capacitor in parallel, the first semiconductor switch and the third semiconductor switch can adopt smaller sizes, so that the problem that the whole size of the rectifier is larger due to the larger sizes of the first semiconductor switch and the third semiconductor switch is avoided, and the occupied space of the rectifier is reduced.

Optionally, the rectifier may further include: the second alternating current signal switch module and the third alternating current signal switch module. The second alternating current signal switch module is connected with the first inductor in parallel and is connected with the driving control circuit. The third alternating current signal switch module is connected with the second inductor in parallel and is connected with the driving control circuit. The drive control circuit is further configured to: in a second working mode, the second alternating current signal switch module is started, so that the low-frequency component in the electric signal of the first input end passes through the first inductor, and the high-frequency component passes through the second alternating current signal switch module; the third alternating current signal switch module is started, so that the low-frequency component in the electric signal of the second input end passes through the second inductor, and the high-frequency component passes through the third alternating current signal switch module; and under the first working mode, the second alternating current signal switch module and the third alternating current signal switch module are closed.

This application can eliminate the ringing phenomenon that the wave form of the voltage signal of first input appears through second alternating current signal switch module, can eliminate the ringing phenomenon that the wave form of the voltage signal of second input appears through third alternating current signal switch module, and then can guarantee the rectifier and normally work, improve the job stabilization nature of rectifier.

Optionally, the second ac signal switch module may include: a sixth semiconductor switch and a second bypass capacitor connected in series. Wherein, the sixth semiconductor switch is connected with the drive control circuit, and the drive control circuit is used for: in a second working mode, the sixth semiconductor switch is started to start the second alternating current signal switch module; and in the first working mode, the sixth semiconductor switch is closed to close the second alternating current signal switch module.

The third ac signal switching module may include: a seventh semiconductor switch and a third bypass capacitor connected in series. Wherein, the seventh semiconductor switch is connected with a drive control circuit, and the drive control circuit is used for: in a second working mode, the seventh semiconductor switch is turned on to turn on the third alternating current signal switch module; and in the first working mode, the seventh semiconductor switch is closed to close the third alternating current signal switch module.

The first semiconductor switch, the second semiconductor switch, the third semiconductor switch or the fourth semiconductor switch in this application may be transistors. By way of example, the transistors may be field effect transistors or bipolar junction transistors, or the like. The transistor may be a junction field effect transistor, such as when the transistor is a field effect transistor, or may be a MOSFET. In addition, the transistors are further classified into P-type transistors and N-type transistors, and in this application, the transistors may be P-type transistors or N-type transistors, and the types of the transistors are not limited in this application.

Optionally, the control electrodes of the semiconductor switches are all connected to an output end of the driving control circuit, the output end is used for outputting a control signal, and the control signal is used for controlling the semiconductor switches to be turned on or turned off. Assuming that the semiconductor switch is a transistor, when the transistor is a field effect transistor, the grid electrode of the transistor is a control electrode, and then the grid electrode of the transistor is connected with the output end of the drive control circuit; when the transistor is a bipolar junction transistor, the base of the transistor is a control electrode, and then the base of the transistor is connected with the output end of the drive control circuit.

Optionally, the driving control circuit in the rectifier of the present application includes a frequency discriminator therein, and the frequency discriminator is used for determining the operation mode to be entered according to the frequency of the electrical signal at the input terminal. The driving control circuit is used for controlling the on or off of each semiconductor switch in the rectifier according to the working mode to be entered determined by the frequency discriminator so as to realize AC-DC rectification. The input terminal is a first input terminal, or the input terminal is a first input terminal and a second input terminal. The working mode to be entered is a first working mode or a second working mode. When the rectifier is a half-bridge rectifier, the frequency discriminator is connected with the first input end; when the rectifier is a full bridge rectifier, the frequency discriminator is connected to the first input terminal and the second input terminal. Further, the driving control circuit further comprises a voltage comparator, wherein the voltage comparator is connected with the voltage output end and used for detecting whether the voltage of the voltage output end is greater than a preset voltage or not, and when the voltage of the voltage output end is greater than the preset voltage, the frequency discriminator is instructed to determine a working mode to be entered according to the frequency of the electric signal of the input end. The rectifier can be switched to a first working mode or a second working mode according to actual requirements, and further adapts to different scenes.

In a second aspect, a driving method for a rectifier is provided, the rectifier being the rectifier according to the first aspect, the rectifier comprising a first leg and a first inductor. The first bridge arm comprises a first upper bridge arm and a first lower bridge arm, the first upper bridge arm is coupled between a first input end and a voltage output end, the first lower bridge arm is coupled between a first input end and a grounding end, the first upper bridge arm is provided with a first semiconductor switch, the first lower bridge arm is provided with a second semiconductor switch, and a first inductor is arranged on the first upper bridge arm or the first lower bridge arm, the method comprises the following steps: when the voltage of the voltage output end is larger than the preset voltage, the working mode to be entered is determined according to the frequency of the electric signal of the input end, the working mode to be entered is a first working mode or a second working mode, and the input end comprises a first input end. And then controlling the first upper bridge arm and the first lower bridge arm to be switched on or off according to the determined work mode to be entered.

Optionally, the rectifier may further include a driving control circuit, and correspondingly, controlling the first upper bridge arm and the first lower bridge arm to be turned on or off according to the determined operating mode to be entered may include: in a first working mode, when the first inductor is arranged on the first upper bridge arm, the first semiconductor switch is turned on through the driving control circuit so as to enable the first upper bridge arm to be always conducted, and the second semiconductor switch is periodically turned on or off; when the first inductor is arranged on the first lower bridge arm, the second semiconductor switch is turned on through the driving control circuit so that the first lower bridge arm is always conducted, and the first semiconductor switch is periodically turned on or turned off. And in a second working mode, the first semiconductor switch and the second semiconductor switch are started at different time intervals by the driving control circuit, so that one of the first upper bridge arm and the first lower bridge arm is switched on and the other one is switched off in the same time interval.

The driving method of the rectifier can control the first upper bridge arm and the first lower bridge arm to be switched on or off according to the determined work mode to be entered, so that the rectifier has the characteristics of a half-bridge class E rectifier in the first work mode and is suitable for high work frequency, and has the characteristics of a half-bridge class D rectifier in the second work mode and is suitable for low work frequency.

Optionally, the rectifier may further include a second bridge arm and a second inductor, where the second bridge arm includes a second upper bridge arm and a second lower bridge arm, the second upper bridge arm is coupled between the second input end and the voltage output end, and the second lower bridge arm is coupled between the second input end and the ground end. The second upper bridge arm is provided with a third semiconductor switch, and the second lower bridge arm is provided with a fourth semiconductor switch. The arrangement of the first inductance and the second inductance corresponds to one of the following situations: the first inductor is arranged on the first upper bridge arm, and the second inductor is arranged on the second upper bridge arm and is connected with the third semiconductor switch in series; or the first inductor is arranged on the first lower bridge arm, the second inductor is arranged on the second lower bridge arm and is connected with the fourth semiconductor switch in series, and the input end further comprises a second input end. The method may further comprise: and controlling the second upper bridge arm and the second lower bridge arm to be switched on or off according to the determined working mode to be entered.

Optionally, the rectifier may further include a driving control circuit, and correspondingly, according to the determined work mode to be entered, controlling on or off of the first upper bridge arm, the first lower bridge arm, the second upper bridge arm, and the second lower bridge arm may include: in a first working mode, when a first inductor is arranged on a first upper bridge arm and a second inductor is arranged on a second upper bridge arm, a first semiconductor switch is started through a driving control circuit to enable the first upper bridge arm to be always conducted, a third semiconductor switch is started to enable the second upper bridge arm to be always conducted, and a second semiconductor switch and a fourth semiconductor switch are started at different time intervals to enable one of a first lower bridge arm and the second lower bridge arm to be conducted and the other one of the first lower bridge arm and the second lower bridge arm to be closed in the same time interval; when the first inductor is arranged on the first lower bridge arm and the second inductor is arranged on the second lower bridge arm, the second semiconductor switch is started through the driving control circuit to enable the first lower bridge arm to be always conducted, the fourth semiconductor switch is started to enable the second lower bridge arm to be always conducted, and the first semiconductor switch and the third semiconductor switch are started at different time intervals to enable one of the first upper bridge arm and the second upper bridge arm to be conducted and the other one of the first upper bridge arm and the second upper bridge arm to be closed in the same time interval. In a second working mode, the two semiconductor switch groups are started in different time intervals through the driving control circuit, so that one of the two bridge arm groups is conducted, the other one of the two bridge arm groups is closed, one of the two semiconductor switch groups comprises a third semiconductor switch and a second semiconductor switch, the other semiconductor switch group comprises a first semiconductor switch and a fourth semiconductor switch, one of the two bridge arm groups comprises a first lower bridge arm and a second upper bridge arm, and the other bridge arm group comprises a second lower bridge arm and a first upper bridge arm.

According to the driving method of the rectifier, the first upper bridge arm, the first lower bridge arm, the second upper bridge arm and the second lower bridge arm can be controlled to be switched on or off according to the determined work mode to be entered, so that the rectifier has the characteristics of a full-bridge class E rectifier in the first work mode, is suitable for high work frequency, has the characteristics of a full-bridge class D rectifier in the second work mode, is suitable for low work frequency, and can be switched between the first work mode and the second work mode to further adapt to different scenes.

Optionally, when the rectifier is a half-bridge rectifier, the rectifier may further include: the first ac signal switching module, the method may further comprise: in a second working mode, the first alternating current signal switch module is started through the driving control circuit, so that the low-frequency component in the electric signal of the first input end passes through the first inductor, and the high-frequency component passes through the first alternating current signal switch module. And under the first working mode, the first alternating current signal switch module is closed through the driving control circuit.

In the application, by the driving method, the ringing phenomenon of amplitude reduction occurring on the waveform of the voltage signal of the first input end can be eliminated, and the normal work of the rectifier can be further ensured.

Optionally, when the rectifier is a full-bridge rectifier, the rectifier may further include: the second alternating current signal switch module and the third alternating current signal switch module. The method may further comprise: in a second working mode, the second alternating current signal switch module is started through the driving control circuit, so that the low-frequency component in the electric signal of the first input end passes through the first inductor, and the high-frequency component passes through the second alternating current signal switch module; and the third alternating current signal switch module is started through the driving control circuit, so that the low-frequency component in the electric signal of the second input end passes through the second inductor, and the high-frequency component passes through the third alternating current signal switch module. And under the first working mode, the second alternating current signal switch module and the third alternating current signal switch module are closed through the driving control circuit.

In the application, by the driving method, the ringing phenomenon of amplitude reduction occurring on the waveforms of the voltage signals of the first input end and the second input end can be eliminated, so that the normal work of the rectifier can be ensured, and the working stability of the rectifier is improved.

In a third aspect, a chip is provided, which comprises a programmable logic circuit and/or stores program instructions for implementing the driving method of the rectifier according to the second aspect.

In a fourth aspect, a chip is provided that includes a rectifier, and a resonant circuit and an output capacitor connected to the rectifier. Wherein the rectifier is the rectifier of the first aspect. The resonant circuit is used for receiving the electric signal sent by the sending end device and providing the electric signal to an input end of the rectifier, wherein the input end is a first input end, or the input end is a first input end and a second input end. The output capacitor is used for carrying out voltage stabilization processing on the direct current signal converted by the rectifier and providing the direct current signal to a load.

In a fifth aspect, an electronic device is provided, which is loaded with the chip of the fourth aspect.

The technical scheme provided by the application has the beneficial effects that:

the rectifier that this application provided has first mode and second mode of operation, and first mode of operation is applicable to high operating frequency, and the second mode of operation is applicable to low operating frequency. In a first working mode, the rectifier has the characteristics of a class E rectifier; in the second working mode, the rectifier has the characteristic of a class D rectifier, can be switched between the first working mode and the second working mode, is suitable for different working frequencies, and further is suitable for different scenes. The electronic equipment comprising the chip manufactured by the rectifier also has two working modes, is suitable for different working frequencies, improves the compatibility of the equipment and reduces the cost of the equipment.

Drawings

FIG. 1 is a schematic circuit diagram of a half-bridge class D rectifier of the related art;

FIG. 2 is a schematic circuit diagram of a full bridge class D rectifier of the related art;

FIG. 3 is a schematic circuit diagram of a half-bridge class E rectifier of the related art;

FIG. 4 is a schematic circuit diagram of a full bridge class E rectifier in the related art;

FIG. 5 is a schematic circuit diagram of another half-bridge class E rectifier of the related art;

FIG. 6 is a schematic circuit diagram of another full-bridge class E rectifier of the related art;

fig. 7 is a schematic structural diagram of a power transmission system according to an embodiment of the present invention;

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

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

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

fig. 10A is a schematic circuit diagram of another rectifier according to an embodiment of the invention;

fig. 10B is a schematic circuit diagram of another rectifier according to an embodiment of the invention;

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

fig. 12A is a schematic circuit diagram of another rectifier according to an embodiment of the invention;

fig. 12B is a schematic circuit diagram of another rectifier according to an embodiment of the invention;

fig. 12C is a schematic waveform diagram of voltage signals at the first input terminal and the second input terminal in the first operation mode according to the embodiment of the invention;

fig. 12D is a schematic waveform diagram of a voltage signal at the voltage output terminal in the first operating mode according to an embodiment of the present invention;

fig. 12E is a schematic waveform diagram of the voltage signals at the first input terminal and the second input terminal in the second operation mode according to the embodiment of the invention;

fig. 12F is a schematic waveform diagram of a voltage signal at the voltage output terminal in the second operation mode according to the embodiment of the invention;

fig. 13A is a schematic circuit diagram of another rectifier according to an embodiment of the invention;

fig. 13B is a schematic waveform diagram of voltage signals of the first input terminal and the second input terminal in the second operation mode according to the embodiment of the invention;

fig. 13C is a schematic waveform diagram of a voltage signal at the voltage output terminal in the second operation mode according to the embodiment of the invention;

fig. 14 is a schematic circuit diagram of another rectifier according to an embodiment of the present invention;

fig. 15 is a schematic circuit diagram of another rectifier according to an embodiment of the present invention;

fig. 16 is a flowchart of a driving method of a rectifier according to an embodiment of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In consideration of the problems of equipment compatibility and cost, the same power equipment can support multiple working modes so as to be suitable for different working frequencies, such as the working frequency of 100-205 KHz, the working frequency of 6.78MHz and the like. Since the rectifier is an indispensable part of the receiving end device, the rectifier needs to support multiple operation modes in order to reduce the cost. Each operating mode corresponds to a WPT technology, for example, each operating mode may correspond to a magnetic induction technology or a magnetic resonance technology.

There are two types of rectifiers in the related art, one being a class D rectifier and the other being a class E rectifier. The working mode of the class D rectifier is suitable for low working frequency (such as 100-205 KHz) and is not suitable for high working frequency (such as 6.78 MHz); the class E rectifier is suitable for high working frequency and not suitable for low working frequency. The class D rectifier is divided into a half-bridge class D rectifier and a full-bridge class D rectifier, and the class E rectifier is divided into a half-bridge class E rectifier and a full-bridge class E rectifier, and a brief introduction is made to several different class D rectifiers and class E rectifiers in the related art.

The circuit structure of the half-bridge class D rectifier is shown in FIG. 1, the gates of M1 and M3 are connected with a gate drive control circuit, M1 and M3 are arranged on one bridge arm, and an output capacitor Co is arranged between a voltage output end Vo and a ground end GND.

The gate drive control circuit is used to turn on M1 and M3 at different time periods. The gate drive control circuit controls the turning on and off of M1 and M3 based on the magnitude of the voltage of the input terminal AC, the voltage of the voltage output terminal Vo, and the voltage of the ground terminal GND. For example, the gate driving control circuit turns off M1 when the voltage of the input AC is less than the voltage of the voltage output Vo, and turns on M3 when the voltage of the input AC is less than the voltage of the ground GND. Assuming that the current signal at the input terminal AC is a sinusoidal current signal, 1 NMOSFET will be turned on and another 1 NMOS will be turned on in each half cycle of the sinusoidal current signalThe FET is turned off so that the rectifier can supply the load R during each cycle of the sinusoidal current signal_LProviding an electric current. When the half-bridge class D rectifier works in a scene with high working frequency, the waveform of a voltage signal of an input end AC is close to a square wave, harmonic distortion is serious, and when the harmonic frequency is in a high-frequency range, serious EMI noise can be brought to electronic equipment, and the EMI noise can generate great influence on the performance of the electronic equipment (such as a mobile terminal); secondly, the switching frequency (i.e. the number of times that 2 NMOSFETs are turned on or off per unit time) of the half-bridge class D rectifier is high, and the switching loss is large. The operating mode of the half-bridge class D rectifier is therefore not suitable for high operating frequencies.

Fig. 2 shows a schematic circuit diagram of a full bridge class D rectifier. Referring to fig. 2, the full bridge class D rectifier includes 4 NMOSFETs: m1, M2, M3 and M4, the gates of 4 NMOSFETs are connected with a gate drive control circuit, M1 and M3 are arranged on one bridge arm, M2 and M4 are arranged on the other bridge arm, and an output capacitor Co is arranged between a voltage output end Vo and a ground end GND. A pair of NMOSFETs at diagonal positions is the same group of NMOSFETs, namely M1 and M4 are one group, M2 and M3 are one group, and the gate drive control circuit is used for turning on the two groups of NMOSFETs at different time intervals. The gate drive control circuit controls the on and off of the two sets of NMOSFETs based on the magnitude of the voltage of the input terminal AC1, the voltage of the input terminal AC2, the voltage of the voltage output terminal Vo, and the voltage of the ground terminal GND. Assuming that the current signals at the input terminals (AC1 and AC2) are sinusoidal current signals, one pair of diagonally positioned NMOSFETs will be turned on and the other pair of NMOSFETs turned off during each half cycle of the sinusoidal current signal, e.g., M1 and M4 will be turned on and M2 and M3 will be turned off. Thus, the rectifier can supply the load R during each cycle of the sinusoidal current signal_LAnd current is supplied to realize the full-bridge rectification function.

However, when the full-bridge class D rectifier shown in fig. 2 operates in a high operating frequency scene, the waveforms of the voltage signals at the input ends (AC1 and AC2) are close to square waves, the harmonic distortion is severe, and the EMI noise is large; and the full-bridge class D rectifier has high switching frequency and large switching loss. The mode of operation of the full bridge class D rectifier is therefore also not suitable for high operating frequencies.

Fig. 3 shows a schematic circuit diagram of a half-bridge class E rectifier. Referring to fig. 3, the half-bridge class E rectifier includes 1 NMOSFET: m3, and 1 inductor: l1. The gate of M3 is connected to a gate drive control circuit. M3 and L1 are arranged on one bridge arm, and M3 and a capacitor C_p1And (4) connecting in parallel. The output capacitor Co is disposed between the voltage output terminal Vo and the ground terminal GND. The gate drive control circuit is used to periodically turn on M3. The gate drive control circuit controls the turning on of the M3 based on the magnitude of the voltage of the input terminal AC, the voltage of the voltage output terminal Vo, and the voltage of the ground terminal GND. In a high operating frequency scenario, the magnitude of the current on L1 changes as the pressure differential across L1 changes. When M3 is turned on, the current on L1 decreases because the voltage difference across L1 is negative; when M3 is turned off, the current at L1 increases because the voltage difference across L1 is positive, the current at L1 remains flowing in one direction, and L1 has a rectifying characteristic at high operating frequencies. So when the current signal at the input AC is a sinusoidal current signal, the half-bridge class E rectifier can give the load R during each cycle of the sinusoidal current signal_LProviding an electric current. In contrast to the half-bridge class D rectifier shown in FIG. 1, C in the half-bridge class E rectifier_p1And L1 form a resonant circuit with reduced harmonic distortion, reduced EMI noise, and reduced switching losses. However, the inductance value of L1 in a scenario of operating at a high operating frequency is not suitable for operating the half bridge class E rectifier in a scenario of low operating frequency.

Fig. 4 shows a schematic circuit diagram of a full bridge class E rectifier. Referring to fig. 4, the full bridge class E rectifier includes 2 NMOSFETs: m3 and M4, and 2 inductors: l1 and L2. The gates of M3 and M4 are connected with a gate drive control circuit, M3 and L1 are arranged on one bridge arm, M4 and L2 are arranged on the other bridge arm, and M3 and a capacitor C_p1In parallel, M4 and a capacitor C_p2And (4) connecting in parallel. The output capacitor Co is disposed between the voltage output terminal Vo and the ground terminal GND. The gate drive control circuit is used to turn on M3 and M4 at different time periods. The gate drive control circuit is based on the voltage of the input end AC1 and the voltage of the input end AC2The voltage of the voltage output Vo and the voltage of the ground terminal GND control the turning on and off of M3 and M4. In a high operating frequency scenario, when M3 is turned on and M4 is turned off, the current at L1 decreases because the voltage difference across L1 is negative, and the current at L2 increases because the voltage difference across L2 is positive; when M4 is turned on and M3 is turned off, the current at L1 increases because the voltage difference across L1 is positive, the current at L2 decreases because the voltage difference across L2 is negative, and L1 and L2 also have rectifying characteristics. So when the current signal at the input terminals (AC1 and AC2) is a sinusoidal current signal, the full bridge class E rectifier can give the load R during each cycle of the sinusoidal current signal_LProviding an electric current. Compared to the full bridge class D rectifier shown in fig. 2, which includes a resonant circuit, the full bridge class E rectifier has reduced harmonic distortion, reduced EMI noise, and reduced switching losses. However, the inductance values of L1 and L2 are not suitable for operating the full bridge class E rectifier in a low operating frequency scenario when operating at a high operating frequency.

Fig. 5 is a schematic diagram of a related art half-bridge class E rectifier, which has a similar operation principle to that of the half-bridge class E rectifier shown in fig. 3, and the operation mode of the half-bridge class E rectifier is also suitable for high operation frequency and not suitable for low operation frequency.

Fig. 6 is a schematic diagram showing a circuit structure of another related full-bridge class E rectifier, which has a similar operation principle to the full-bridge class E rectifier shown in fig. 4, and similarly, the operation mode of the full-bridge class E rectifier is relatively suitable for high operation frequency and not suitable for low operation frequency.

The rectifier provided by the embodiment of the invention has the characteristics of both a class D rectifier and a class E rectifier, and has a first working mode and a second working mode, wherein the first working mode is suitable for high working frequency, and the second working mode is suitable for low working frequency. Illustratively, the first mode of operation is applicable to an operating frequency of 6.78 MHz; the second working mode is suitable for the working frequency of 100-205 KHz. Each operating mode corresponds to a WPT technique, for example, the first operating mode corresponds to a magnetic resonance technique and the second operating mode corresponds to a magnetic induction technique.

Fig. 7 is a schematic structural diagram of a power transmission system according to a rectifier provided in an embodiment of the present invention, and as shown in fig. 7, the power transmission system includes an electronic device 01 and an electronic device 02, where the electronic device 01 is a sending-end device of an electrical signal, and the electronic device 02 is a receiving-end device of the electrical signal.

The electronic device 02 is loaded with a chip, and the rectifier 021 provided by the embodiment of the invention can be arranged in the chip. Referring to fig. 7, the chip further includes a resonant circuit 022 connected to a rectifier 021 and an output capacitor Co. An output terminal of the resonant circuit 022 is connected to the first input terminal AC1 and the second input terminal AC2 of the rectifier 021, and a voltage output terminal Vo of the rectifier 021 is connected to the output capacitor Co.

The resonant circuit 022 is configured to receive an electrical signal transmitted by the electronic device 01 and provide the electrical signal to an input of the rectifier 021, the input being the first input AC1 or the first input AC1 and the second input AC 2. Resonant circuit 022 may include a receive coil L_RAnd a resonance capacitor C_R。

The output capacitor Co is used for performing voltage stabilization processing on the direct current signal converted by the rectifier 021 and providing the direct current signal to a load.

Optionally, the chip may further include a communication module, through which the electronic device 02 may exchange information with an external device (such as the electronic device 01).

Fig. 8A schematically illustrates a circuit structure of a rectifier provided by an embodiment of the present invention, the rectifier is a half-bridge rectifier, and referring to fig. 8A, the rectifier includes a first leg and a first inductor L1. The first leg comprises a first upper leg 001 coupled between the first input terminal AC1 and the voltage output Vo and a first lower leg 002 coupled between the first input terminal AC1 and ground GND.

The first upper arm 001 is provided with a first semiconductor switch M1, and the first semiconductor switch M1 is used for turning on or off the first upper arm 001.

The first lower arm 002 is provided with a second semiconductor switch M3, and the second semiconductor switch M3 is used for turning on or off the first lower arm 002.

A first inductor L1 is disposed on the first upper leg 001 and is connected in series with the first semiconductor switch M1. In the embodiment of the present invention, the first inductor L1 may be connected in series with the first semiconductor switch M1, and the first inductor L1 may be disposed between the first input terminal AC1 and the first semiconductor switch M1, as shown in fig. 8A; in addition, a first inductor L1 may also be disposed between the first semiconductor switch M1 and the voltage output terminal Vo, as shown in fig. 8B.

Referring to fig. 8A, the rectifier may further include a first capacitor C_P1First capacitor C_P1A first capacitor C arranged on the first lower arm 002 and connected in parallel with the second semiconductor switch M3_P1A resonant circuit is formed with the first inductor L1 to attenuate harmonic distortion and reduce EMI noise.

Wherein the first capacitor C_P1And a first inductance L1 is arranged on both sides of the first input AC1, i.e. one on the first upper leg and one on the first lower leg, so that a first capacitance C_P1The resonant circuit formed with the first inductor L1 does not affect the rectifying characteristics that the first inductor L1 has at high operating frequencies.

In the embodiment of the invention, the second semiconductor switch M3 is connected in parallel with the first capacitor C_P1Therefore, the second semiconductor switch M3 can be made smaller, thereby avoiding the larger size of the rectifier due to the larger size of the second semiconductor switch M3. in the embodiment of the present invention, the first capacitor C is connected in parallel to the second semiconductor switch M3_P1Decrease ofThe space occupied by the rectifier is reduced.

Referring to fig. 8A, optionally, the rectifier further includes a driving control circuit CTRL, the rectifier having a first operation mode and a second operation mode under the control of the driving control circuit CTRL, the driving control circuit CTRL being configured to:

in the first operation mode, the first semiconductor switch M1 is turned on to make the first upper leg 001 always conducting, and the second semiconductor switch M3 is turned on or off periodically. In this operation mode, the first inductor L1 has a rectifying characteristic, the first semiconductor switch M1 is always turned on, and the on-resistance of the first semiconductor switch M1 may be regarded as a part of a Direct Current Resistance (DCR) of the first inductor L1, wherein the driving control circuit CTRL periodically turns on or off the second semiconductor switch M3 based on the voltage of the first input terminal AC1, the voltage of the voltage output terminal Vo, and the voltage of the ground terminal GND, for example, the driving control circuit CTRL turns on the M3 when the voltage of the first input terminal AC1 is less than the voltage of the ground terminal GND. The current signal at the first input AC1 is a periodic signal, for example, the driving control circuit CTRL may turn on the second semiconductor switch M3 in the first half period of each period, so as to supply current to the load in the whole period, thereby providing the feature of a half-bridge class E rectifier, which has a function similar to that of the half-bridge class E rectifier shown in fig. 3, and has a smaller switching loss;

in the second operation mode, the first semiconductor switch M1 and the second semiconductor switch M3 are turned on at different time intervals, so that one of the first upper leg 001 and the first lower leg 002 is turned on and the other is turned off in the same time interval. In this operation mode, the first inductor L1 is a low impedance path for the alternating current component in the electrical signal of the first input terminal AC1, i.e., has a small blocking effect on the alternating current component, wherein the driving control circuit CTRL turns on the first semiconductor switch M1 and the second semiconductor switch M3 at different periods of time based on the voltage of the first input terminal AC1, the voltage of the voltage output terminal Vo, and the voltage of the ground terminal GND, for example, the driving control circuit CTRL turns off the first semiconductor switch M1 when the voltage of the first input terminal AC1 is less than the voltage of the voltage output terminal Vo, and turns on the second semiconductor switch M3 when the voltage of the first input terminal AC1 is less than the voltage of the ground terminal GND. The current signal at the first input AC1 is a periodic signal, for example, the driving control circuit CTRL may turn on the first semiconductor switch M1 in the first half period of each cycle and turn on the second semiconductor switch M3 in the second half period of each cycle, so as to supply current to the load in the whole cycle, thereby providing the features of a half-bridge class D rectifier, which functions similarly to the half-bridge class D rectifier shown in fig. 1.

In the embodiment of the present invention, turning on the semiconductor switch turns on the upper or lower arm where the semiconductor switch is located, for example, referring to fig. 8A, turning on the first semiconductor switch M1 turns on the first upper arm 001.

In summary, the rectifier provided in the embodiments of the present invention has the first operating mode and the second operating mode, in the first operating mode, the first semiconductor switch M1 always conducts the first upper arm, and the second semiconductor switch M3 periodically conducts the first lower arm, so as to have the characteristics of a half-bridge class E rectifier, and be suitable for high operating frequency; in the second working mode, at different time intervals, the first semiconductor switch M1 conducts the first upper leg, and the second semiconductor switch M3 conducts the first lower leg, so that the rectifier has the characteristics of a half-bridge class D rectifier, is suitable for low working frequency, can be switched between the first working mode and the second working mode, and further adapts to different scenes.

Fig. 9 is a schematic circuit diagram of another rectifier provided on the basis of the rectifier shown in fig. 8A according to the embodiment of the present invention, the rectifier is a half-bridge rectifier, referring to fig. 9, the rectifier includes a first bridge arm and a first inductor L1, the first bridge arm includes a first upper bridge arm 001 and a first lower bridge arm 002, the first upper bridge arm 001 is coupled between a first input terminal AC1 and a voltage output terminal Vo, and the first lower bridge arm 002 is coupled between a first input terminal AC1 and a ground terminal GND.

A first inductor L1 is disposed on the first upper leg 001 and is connected in series with the first semiconductor switch M1.

The rectifier has a first mode of operation adapted for high operating frequencies and a second mode of operation adapted for low operating frequencies.

Optionally, referring to fig. 9, the rectifier may further include a first capacitor C_P1First capacitor C_P1Is provided on first lower arm 002 and is connected in parallel with second semiconductor switch M3. A first capacitor C_P1A resonant circuit is formed with the first inductor L1 to attenuate harmonic distortion and reduce EMI noise. Since the second semiconductor switch M3 is connected in parallel with the first capacitor C_P1Therefore, the second semiconductor switch M3 can be smaller in size, thereby reducing the occupation space of the rectifier.

The rectifier further comprises a drive control circuit CTRL, the rectifier having a first operating mode and a second operating mode under the control of the drive control circuit CTRL, the drive control circuit CTRL being configured to:

in the first operation mode, the first semiconductor switch M1 is turned on to make the first upper leg 001 always conductive, and the second semiconductor switch M3 is turned on or off periodically, wherein the driving control circuit CTRL periodically turns on or off the second semiconductor switch M3 based on the voltage of the first input terminal AC1, the voltage of the voltage output terminal Vo, and the voltage of the ground terminal GND. The current signal of the first input terminal AC1 is a periodic signal, for example, the driving control circuit CTRL may turn on the second semiconductor switch M3 in the first half period of each period, so as to supply current to the load in the whole period, and has the feature of a half-bridge class E rectifier, which has a function similar to that of the half-bridge class E rectifier shown in fig. 3;

in the second operation mode, the first semiconductor switch M1 and the second semiconductor switch M3 are turned on at different time intervals, so that one of the first upper leg 001 and the first lower leg 002 is turned on and the other is turned off in the same time interval. Wherein the drive control circuit CTRL turns on the first and second semiconductor switches M1 and M3 at different periods based on the magnitudes of the voltage of the first input terminal AC1, the voltage of the voltage output terminal Vo, and the voltage of the ground terminal GND. The current signal of the first input terminal AC1 is a periodic signal, for example, the driving control circuit CTRL may turn on the first semiconductor switch M1 in the first half period of each period, and turn on the second semiconductor switch M3 in the second half period, so as to supply current to the load in the whole period.

Optionally, as shown in fig. 9, the rectifier further includes: the first ac signal switch module 91 is connected in parallel with the first inductor L1, and the first ac signal switch module 91 is connected to the driving control circuit CTRL. Correspondingly, the drive control circuit CTRL is also configured to:

in the second operation mode, the first AC signal switch module 91 is turned on, so that the low frequency component in the electrical signal of the first input AC1 passes through the first inductor L1, and the high frequency component passes through the first AC signal switch module 91. In the second operating mode, the first ac signal switch module 91 is always turned on;

in the first operation mode, the first ac signal switch module 91 is turned off.

Referring to fig. 9, in the second operation mode, the first capacitor C is connected in parallel with the second semiconductor switch M3_P1The resonant circuit formed by the first inductor L1 affects the high frequency component of the electrical signal of the first input terminal AC1, the first inductor L1 has a large blocking effect on the high frequency component, which causes the ringing phenomenon of the waveform of the voltage signal of the first input terminal AC1, and when the ringing phenomenon of the waveform of the voltage signal of the first input terminal AC1 occurs, the normal operation of the rectifier is directly affected, and the operating state of the rectifier is relatively unstable. According to the embodiment of the invention, the high-frequency component can pass through the first alternating current signal switch module, so that the high-frequency component is prevented from being blocked by the first inductor L1, the amplitude-reducing ringing phenomenon of the waveform of the voltage signal of the first input end AC1 is eliminated, the normal work of the rectifier can be ensured, and the work of the rectifier is improvedAnd (4) stability.

For example, when the second semiconductor switch M3 is large in size and the capacitance of the parasitic capacitor can reach the capacitance required for operation, the second semiconductor switch M3 does not need to be connected in parallel with the first capacitor C_P1In this case, the parasitic capacitance of the second semiconductor switch M3 forms a resonant circuit with the first inductor L1. In the second operation mode, the resonant circuit formed by the parasitic capacitance of the second semiconductor switch M3 and the first inductor L1 affects the high frequency component of the electrical signal of the first input terminal AC1, and the first inductor L1 has a large blocking effect on the high frequency component, so that the ringing phenomenon occurs in the waveform of the voltage signal of the first input terminal AC 1. When the waveform of the voltage signal of the first input terminal AC1 exhibits ringing, the normal operation of the rectifier is directly affected, and the operating state of the rectifier is relatively unstable. According to the embodiment of the invention, the high-frequency component passes through the first alternating current signal switch module, so that the high-frequency component is prevented from being blocked by the first inductor L1, the amplitude reduction ringing phenomenon of the waveform of the voltage signal of the first input end AC1 is eliminated, the normal work of the rectifier can be ensured, and the work stability of the rectifier is improved.

As shown in fig. 9, the first ac signal switching module 91 may include: the fifth semiconductor switch M5 and the first bypass capacitor C1 connected in series, the fifth semiconductor switch M5 is connected to a driving control circuit CTRL, and the driving control circuit CTRL is configured to:

in the second operation mode, the fifth semiconductor switch M5 is turned on to turn on the first ac signal switching module 91;

in the first operation mode, the fifth semiconductor switch M5 is turned off to turn off the first ac signal switching module 91.

The inductance and the capacitance have the effect of blocking the alternating current, and for the inductance, the higher the frequency of the alternating current is, the greater the inductive reactance is, and the effect of blocking the alternating current by the inductance is to pass low frequency and high frequency. For the capacitor, the higher the frequency of the alternating current is, the smaller the capacitive reactance is, and the blocking effect of the capacitor on the alternating current is to pass high-frequency and low-frequency resistance. Based on this, in the embodiment of the present invention, in the second operation mode, the fifth semiconductor switch M5 is turned on, the low-frequency component in the electrical signal of the first input terminal AC1 passes through the first inductor L1, and the high-frequency component passes through the first bypass capacitor C1, so that the high-frequency component is prevented from being blocked by the first inductor L1, and the operation stability of the rectifier is improved.

In summary, the rectifier provided in the embodiments of the present invention has the first operating mode and the second operating mode, in the first operating mode, the first semiconductor switch M1 always conducts the first upper arm, and the second semiconductor switch M3 periodically conducts the first lower arm, so as to have the characteristics of a half-bridge class E rectifier, and be suitable for high operating frequency; in the second working mode, at different time intervals, the first semiconductor switch M1 conducts the first upper leg, and the second semiconductor switch M3 conducts the first lower leg, so that the rectifier has the characteristics of a half-bridge class D rectifier, is suitable for low working frequency, can be switched between the first working mode and the second working mode, and further adapts to different scenes. And the rectifier eliminates the amplitude reduction ringing phenomenon of the waveform of the voltage signal of the first input end AC1 through the first alternating current signal switch module, so that the normal work of the rectifier can be ensured, and the work stability of the rectifier is improved.

Fig. 10A schematically illustrates a circuit structure of another rectifier provided by the embodiment of the present invention, where the rectifier is a half-bridge rectifier, and referring to fig. 10A, the rectifier includes a first leg and a first inductor L1, the first leg includes a first upper leg 001 and a first lower leg 002, the first upper leg 001 is coupled between a first input terminal AC1 and a voltage output terminal Vo, and the first lower leg 002 is coupled between a first input terminal AC1 and a ground terminal GND.

A first inductance L1 is arranged on the first lower leg 002 and is connected in series with the second semiconductor switch M3. In the embodiment of the present invention, the first inductor L1 may be connected in series with the second semiconductor switch M3, and the first inductor L1 may be disposed between the first input terminal AC1 and the second semiconductor switch M3, as shown in fig. 10A; in addition, the first inductor L1 may also be disposed between the second semiconductor switch M3 and the ground, as shown in fig. 10B.

As shown in fig. 10A, the rectifier may further include a first capacitor C_P1First capacitor C_P1A first capacitor C arranged on the first upper arm 001 and connected in parallel with the first semiconductor switch M1_P1A resonant circuit is formed with the first inductor L1 to attenuate harmonic distortion and reduce EMI noise. Wherein the first capacitor C_P1And a first inductor L1 arranged on both sides of the first input terminal AC1, a first capacitor C_P1The resonant circuit formed with the first inductor L1 does not affect the rectifying characteristics that the first inductor L1 has at high operating frequencies.

In the embodiment of the invention, the first capacitor C is connected in parallel with the first semiconductor switch M1_P1Therefore, the first semiconductor switch M1 can be made smaller, thereby avoiding the larger size of the rectifier due to the larger size of the first semiconductor switch M1, by connecting the first capacitor C in parallel with the first semiconductor switch M1_P1And the occupied space of the rectifier is reduced.

Optionally, the rectifier further comprises a driving control circuit CTRL, the rectifier has a first operation mode and a second operation mode under the control of the driving control circuit CTRL, and the driving control circuit CTRL is configured to:

in the first operation mode, the second semiconductor switch M3 is turned on to make the first lower arm 002 always conducting, and the first semiconductor switch M1 is turned on or off periodically. In this operation mode, the first inductor L1 has a rectifying characteristic, the second semiconductor switch M3 is always turned on, and the on-resistance of the second semiconductor switch M3 can be regarded as a part of the DCR of the first inductor L1, wherein the current signal of the first input terminal AC1 is a periodic signal, for example, the driving control circuit CTRL can turn on the first semiconductor switch M1 in the first half period of each period, so as to supply current to the load in the whole period, which has the feature of a half-bridge class E rectifier, the function of which is similar to that of the half-bridge class E rectifier shown in fig. 5, and the switching loss of the rectifier is small;

in the second operation mode, the first semiconductor switch M1 and the second semiconductor switch M3 are turned on at different time intervals, so that one of the first upper leg 001 and the first lower leg 002 is turned on and the other is turned off in the same time interval. In this operation mode, the first inductor L1 is a low impedance path for the alternating current component in the electrical signal of the first input terminal AC1, wherein the current signal of the first input terminal AC1 is a periodic signal, for example, the driving control circuit CTRL may turn on the first semiconductor switch M1 in the first half period of each period, and turn on the second semiconductor switch M3 in the second half period, so as to supply current to the load in the whole period, which has the characteristics of a half-bridge class D rectifier, and the function of the rectifier is similar to that of the half-bridge class D rectifier shown in fig. 1.

In summary, the rectifier provided in the embodiments of the present invention has the first operating mode and the second operating mode, in the first operating mode, the second semiconductor switch M3 always conducts the first lower arm, and the first semiconductor switch M1 periodically conducts the first upper arm, so as to have the characteristics of a half-bridge class E rectifier, and be suitable for high operating frequency; in the second working mode, at different time intervals, the first semiconductor switch M1 conducts the first upper leg, and the second semiconductor switch M3 conducts the first lower leg, so that the rectifier has the characteristics of a half-bridge class D rectifier, is suitable for low working frequency, can be switched between the first working mode and the second working mode, and further adapts to different scenes.

Fig. 11 is a schematic circuit diagram of another rectifier provided on the basis of the rectifier shown in fig. 10A according to the embodiment of the present invention, the rectifier is a half-bridge rectifier, and referring to fig. 11, the rectifier includes a first bridge arm and a first inductor L1, and the first bridge arm includes a first upper bridge arm 001 and a first lower bridge arm 002. The first upper leg 001 is coupled between the first input terminal AC1 and the voltage output Vo, and the first lower leg 002 is coupled between the first input terminal AC1 and the ground terminal GND.

A first inductance L1 is arranged on the first lower leg 002 and is connected in series with the second semiconductor switch M3.

Optionally, referring to fig. 11, the rectifier may further include a first capacitor C_P1First capacitor C_P1Is arranged on the first upper bridge arm 001 and is connected in parallel with the first semiconductor switch M1. A first capacitor C_P1A resonant circuit is formed with the first inductor L1 to attenuate harmonic distortion and reduce EMI noise. Since the first semiconductor switch M1 is connected in parallel with the first capacitor C_P1Therefore, the first semiconductor switch M1 can be smaller in size, reducing the space occupied by the rectifier.

in the first operation mode, the second semiconductor switch M3 is turned on to make the first lower arm 002 always conducting, and the first semiconductor switch M1 is turned on or off periodically, which has the characteristics of a half-bridge class E rectifier, and the function of the rectifier is similar to that of the half-bridge class E rectifier shown in fig. 5;

in the second operation mode, the first semiconductor switch M1 and the second semiconductor switch M3 are turned on at different time intervals, so that one of the first upper leg 001 and the first lower leg 002 is turned on and the other is turned off in the same time interval. In this mode of operation, the first inductor L1 is a low impedance path for the AC component in the electrical signal at the first input AC1, and has the characteristics of a half-bridge class D rectifier, which functions similarly to the half-bridge class D rectifier shown in fig. 1.

Optionally, as shown in fig. 11, the rectifier further includes: the first ac signal switch module 91, the first ac signal switch module 91 is connected in parallel with the first inductor L1 and is connected to the driving control circuit CTRL, and accordingly, the driving control circuit CTRL is further configured to:

Referring to fig. 11, in the second operation mode, the first capacitor C_P1The resonant circuit formed with the first inductor L1 may affect the high frequency component in the electrical signal of the first input terminal AC1, resulting in a ringing phenomenon in the waveform of the voltage signal of the first input terminal AC 1. According to the embodiment of the invention, the high-frequency component passes through the first alternating current signal switch module, so that the amplitude reduction ringing phenomenon of the waveform of the voltage signal of the first input end AC1 is eliminated, the normal work of the rectifier can be ensured, and the work stability of the rectifier is improved.

For example, when the first semiconductor switch M1 is large in size and the capacitance of the parasitic capacitor can reach the capacitance required for operation, the first semiconductor switch M1 does not need to be connected in parallel with the first capacitor C_P1In this case, the parasitic capacitance of the first semiconductor switch M1 forms a resonant circuit with the first inductor L1. In the second operation mode, the resonant circuit formed by the parasitic capacitance of the first semiconductor switch M1 and the first inductor L1 affects the high frequency component of the electrical signal of the first input terminal AC1, and the first inductor L1 has a large blocking effect on the high frequency component, so that the ringing phenomenon occurs in the waveform of the voltage signal of the first input terminal AC 1. When the waveform of the voltage signal of the first input end AC1 has ringing phenomenon, the normal work of the rectifier is directly influenced, and the work of the rectifier is directly influencedThe operating state is less stable. According to the embodiment of the invention, the high-frequency component can pass through the first alternating current signal switch module, so that the high-frequency component is prevented from being blocked by the first inductor L1, the amplitude reduction ringing phenomenon of the waveform of the voltage signal of the first input end AC1 is eliminated, the normal work of the rectifier can be ensured, and the work stability of the rectifier is improved.

As shown in fig. 11, the first ac signal switching module 91 may include: the fifth semiconductor switch M5 and the first bypass capacitor C1 connected in series, the fifth semiconductor switch M5 is connected to a driving control circuit CTRL, and the driving control circuit CTRL is configured to:

In summary, the rectifier provided in the embodiments of the present invention has the first operating mode and the second operating mode, in the first operating mode, the second semiconductor switch M3 always conducts the first lower arm, and the first semiconductor switch M1 periodically conducts the first upper arm, so as to have the characteristics of a half-bridge class E rectifier, and be suitable for high operating frequency; in the second working mode, at different time intervals, the first semiconductor switch M1 conducts the first upper leg, and the second semiconductor switch M3 conducts the first lower leg, so that the rectifier has the characteristics of a half-bridge class D rectifier, is suitable for low working frequency, can be switched between the first working mode and the second working mode, and further adapts to different scenes. And the rectifier eliminates the amplitude reduction ringing phenomenon of the waveform of the voltage signal of the first input end AC1 through the first alternating current signal switch module, so that the normal work of the rectifier can be ensured, and the work stability of the rectifier is improved.

Fig. 12A shows a schematic circuit structure diagram of another rectifier provided in the embodiment of the present invention, the rectifier is a full bridge rectifier, and referring to fig. 12A, the rectifier includes a first leg, a second leg, a first inductor L1, and a second inductor L2. The first leg comprises a first upper leg 001 and a first lower leg 002, the first upper leg 001 being coupled between the first input terminal AC1 and the voltage output Vo, the first lower leg 002 being coupled between the first input terminal AC1 and the ground terminal GND. The second leg comprises a second upper leg 003 and a second lower leg 004, the second upper leg 003 being coupled between the second input terminal AC2 and the voltage output Vo, the second lower leg 004 being coupled between the second input terminal AC2 and the ground terminal GND.

A first inductor L1 is disposed on the first upper leg 001 and is connected in series with the first semiconductor switch M1. In the embodiment of the present invention, the first inductor L1 may be connected in series with the first semiconductor switch M1, and the first inductor L1 may be disposed between the first input terminal AC1 and the first semiconductor switch M1, as shown in fig. 12A; in addition, a first inductor L1 may also be provided between the first semiconductor switch M1 and the voltage output terminal Vo, as shown in fig. 12B.

Second upper arm 003 is provided with third semiconductor switch M2, and third semiconductor switch M2 is used to turn on or off second upper arm 003.

The second lower bridge arm 004 is provided with a fourth semiconductor switch M4, and the fourth semiconductor switch M4 is used for turning on or off the second lower bridge arm 004.

A second inductor L2 is disposed in the second upper leg 003 and is connected in series with the third semiconductor switch M2. Likewise, a second inductor L2 may be provided between the second input terminal AC2 and the third semiconductor switch M2, as shown in fig. 12A; in addition, a second inductor L2 may also be disposed between the third semiconductor switch M2 and the voltage output terminal Vo, as shown in fig. 12B.

Referring to fig. 12A, the rectifier may further include a second capacitor C_P2And a third capacitance C_P3. Wherein the second capacitor C_P2A third capacitor C provided in parallel with the second semiconductor switch M3 on the first lower arm 002_P3Is arranged on the second lower leg 004 and is connected in parallel with the fourth semiconductor switch M4. Second capacitor C_P2A resonant circuit formed with the first inductor L1, and a third capacitor C_P3And the second inductor L2 form a resonant circuit, and the purpose of reducing EMI noise is achieved by the resonant circuit.

In the embodiment of the invention, the second semiconductor switch M3 is connected in parallel with the second capacitor C_P2The fourth semiconductor switch M4 is connected in parallel with a third capacitor C_P3Therefore, the second semiconductor switch M3 and the fourth semiconductor switch M4 can be smaller in size, so that the problem that the overall size of the rectifier is larger due to the larger size of the second semiconductor switch M3 and the fourth semiconductor switch M4 is avoided, and the occupied space of the rectifier is reduced.

Referring to fig. 12A, the rectifier may further include a drive control circuit CTRL, the rectifier having a first operating mode and a second operating mode under the control of the drive control circuit CTRL, the drive control circuit CTRL being configured to:

in the first operating mode, the first semiconductor switch M1 is turned on to make the first upper leg 001 always conductive, the third semiconductor switch M2 is turned on to make the second upper leg 003 always conductive, and the second semiconductor switch M3 and the fourth semiconductor switch M4 are turned on at different time intervals to make one of the first lower leg 002 and the second lower leg 004 conductive and the other one off in the same time interval. In this operation mode, the first inductor L1 and the second inductor L2 have a rectification characteristic, the first semiconductor switch M1 and the third semiconductor switch M2 are always turned on, the on-resistance of the first semiconductor switch M1 may be regarded as a part of the DCR of the first inductor L1, and the on-resistance of the third semiconductor switch M2 may be regarded as a part of the DCR of the second inductor L2, wherein the driving control circuit CTRL turns on the second semiconductor switch M3 and the fourth semiconductor switch M4 at different periods based on the magnitudes of the voltage of the first input terminal AC1, the voltage of the second input terminal AC2, the voltage of the voltage output terminal Vo, and the voltage of the ground terminal GND. The current signals of the first input terminal AC1 and the second input terminal AC2 are periodic signals, for example, the driving control circuit CTRL may turn on the second semiconductor switch M3 in the first half period and turn on the fourth semiconductor switch M4 in the second half period of each period, so as to supply current to the load in the whole period, thereby providing the features of the full-bridge class E rectifier, which has the function similar to that of the full-bridge class E rectifier shown in fig. 4. And because the first semiconductor switch M1 and the third semiconductor switch M2 are always turned on, the switching frequency of the rectifier is low, and the switching loss is small. Fig. 12C shows waveforms of the voltage signals of the first input terminal AC1 and the second input terminal AC2 in this operation mode, and the waveform of the voltage signal of the first input terminal AC1 is the same as the waveform of the voltage signal of the second input terminal AC 2. As can be seen from fig. 12C, the waveform of the voltage signal at the input terminal is close to a cosine wave, which is an important feature that the full-bridge class E rectifier has. Fig. 12D shows a waveform diagram of the voltage signal at the voltage output Vo in this operation mode. 12C and 12D are time in microseconds (us) on the abscissa and voltage values in volts (V) on the ordinate;

in the second working mode, the two semiconductor switch groups are started at different time intervals, so that one of the two bridge arm groups is conducted, and the other is closed in the same time interval. One of the two semiconductor switch groups comprises a third semiconductor switch M2 and a second semiconductor switch M3, and the other semiconductor switch group comprises a first semiconductor switch M1 and a fourth semiconductor switch M4. One of the two sets of arms comprises a first lower arm 002 and a second upper arm 003, and the other set of arms comprises a second lower arm 004 and a first upper arm 001. In this operation mode, the first inductor L1 is a low-impedance path for the alternating-current component in the electrical signal of the first input terminal AC1, i.e., has a small blocking effect on the alternating-current component, and the second inductor L2 is also a low-impedance path for the alternating-current component in the electrical signal of the second input terminal AC2, wherein the drive control circuit CTRL opens the two semiconductor switch groups at different periods based on the magnitudes of the voltage of the first input terminal AC1, the voltage of the second input terminal AC2, the voltage of the voltage output terminal Vo, and the voltage of the ground terminal GND. The current signals of the first input terminal AC1 and the second input terminal AC2 areThe periodic signal, for example, the driving control circuit CTRL may turn on the third semiconductor switch M2 and the second semiconductor switch M3 in the first half period of each period, and turn on the first semiconductor switch M1 and the fourth semiconductor switch M4 in the second half period, so as to supply current to the load in the whole period, thereby providing the features of the full-bridge class D rectifier, which functions similarly to the full-bridge class D rectifier shown in fig. 2. Fig. 12E shows waveforms of the voltage signals of the first input terminal AC1 and the second input terminal AC2 in this operation mode, and the waveform of the voltage signal of the first input terminal AC1 is the same as the waveform of the voltage signal of the second input terminal AC 2. It can be seen that the waveforms of the voltage signals at the input terminals of the rectifier shown in fig. 12A and the full bridge class D rectifier shown in fig. 2 are different, the waveform of the voltage signal at the input terminal of the full bridge class D rectifier shown in fig. 2 is close to a square wave, and the waveform of the voltage signal at the input terminal of the rectifier shown in fig. 12A has a ringing phenomenon because of the second capacitor C_P2A resonant circuit is formed with the first inductor L1, the resonant circuit can affect the high-frequency component in the electric signal of the first input terminal AC1, and the first inductor L1 has a large blocking effect on the high-frequency component; at the same time, the third capacitor C_P3A resonance circuit is formed with the second inductor L2, which affects the high frequency component of the electrical signal at the second input AC2, and the second inductor L2 has a large blocking effect on the high frequency component. Fig. 12F shows a waveform diagram of the voltage signal at the voltage output Vo in the operation mode. The abscissa in fig. 12E and 12F is time in microseconds and the ordinate is voltage value in volts.

In summary, the rectifier provided in the embodiment of the present invention has a first operating mode and a second operating mode, in the first operating mode, the first semiconductor switch M1 always conducts the first upper bridge arm, the third semiconductor switch M2 always conducts the second upper bridge arm, and in different time periods, the second semiconductor switch M3 conducts the first lower bridge arm, and the fourth semiconductor switch M4 conducts the second lower bridge arm, so as to have the characteristics of a full-bridge class E rectifier, and be suitable for high operating frequency; in the second working mode, the two semiconductor switch groups are started at different time intervals, so that one of the two bridge arm groups is conducted and the other is closed in the same time interval, the characteristic of a full-bridge class D rectifier is achieved, the rectifier is suitable for low working frequency, and the rectifier can be switched between the first working mode and the second working mode to further adapt to different scenes.

Fig. 13A is a schematic circuit structure diagram of another rectifier provided on the basis of the rectifier shown in fig. 12A according to the embodiment of the present invention, the rectifier is a full bridge rectifier, and referring to fig. 13A, the rectifier includes a first bridge arm, a second bridge arm, a first inductor L1, and a second inductor L2. The first leg comprises a first upper leg 001 coupled between the first input terminal AC1 and the voltage output Vo, and a first lower leg 002 coupled between the first input terminal AC1 and ground GND. The second leg comprises a second upper leg 003 and a second lower leg 004, the second upper leg 003 being coupled between the second input terminal AC2 and the voltage output Vo, the second lower leg 004 being coupled between the second input terminal AC2 and the ground terminal GND.

A first inductor L1 is disposed on the first upper leg 001 and is connected in series with the first semiconductor switch M1. The first inductor L1 may be disposed between the first input AC1 and the first semiconductor switch M1, or between the first semiconductor switch M1 and the voltage output Vo.

A second inductor L2 is disposed in the second upper leg 003 and is connected in series with the third semiconductor switch M2. The second inductor L2 may be disposed between the second input terminal AC2 and the third semiconductor switch M2, or may be disposed between the third semiconductor switch M2 and the voltage output terminal Vo.

Optionally, referring to fig. 13A, the rectifier may further include a second capacitor C_P2And a third capacitance C_P3. Wherein the second capacitor C_P2A third capacitor C provided in parallel with the second semiconductor switch M3 on the first lower arm 002_P3Is arranged on the second lower leg 004 and is connected in parallel with the fourth semiconductor switch M4. Second capacitor C_P2A resonant circuit formed with the first inductor L1, and a third capacitor C_P3And the second inductor L2 form a resonant circuit, and the purpose of reducing EMI noise is achieved by the resonant circuit.

In the embodiment of the invention, the second semiconductor switch M3 is connected in parallel with the second capacitor C_P2The fourth semiconductor switch M4 is connected in parallel with a third capacitor C_P3Therefore, the second semiconductor switch M3 and the fourth semiconductor switch M4 can be smaller in size, and the occupied space of the rectifier is reduced.

Referring to fig. 13A, the rectifier may further include a driving control circuit CTRL, the rectifier having a first operation mode and a second operation mode under the control of the driving control circuit CTRL, the driving control circuit CTRL being configured to:

in a first working mode, the first semiconductor switch M1 is turned on to make the first upper arm 001 always conductive, the third semiconductor switch M2 is turned on to make the second upper arm 003 always conductive, and the second semiconductor switch M3 and the fourth semiconductor switch M4 are turned on at different time intervals to make one of the first lower arm 002 and the second lower arm 004 conductive and the other one off in the same time interval, so that the characteristic of a full-bridge class E rectifier is provided, and the function of the rectifier is similar to that of the full-bridge class E rectifier shown in fig. 4;

in the second operation mode, the two semiconductor switch groups are turned on at different time intervals, so that one of the two bridge arm groups is turned on and the other is turned off in the same time interval, one of the two semiconductor switch groups comprises a third semiconductor switch M2 and a second semiconductor switch M3, the other semiconductor switch group comprises a first semiconductor switch M1 and a fourth semiconductor switch M4, one of the two bridge arm groups comprises a first lower bridge arm 002 and a second upper bridge arm 003, and the other bridge arm group comprises a second lower bridge arm 004 and a first upper bridge arm 001.

Referring to fig. 13A, the rectifier may further include: a second ac signal switching module 131 and a third ac signal switching module 132. The second ac signal switch module 131 is connected in parallel with the first inductor L1 and is connected to the driving control circuit CTRL. The third ac signal switch module 132 is connected in parallel with the second inductor L2 and is connected to the driving control circuit CTRL. Correspondingly, the drive control circuit CTRL is also configured to:

in the second operation mode, the second AC signal switching module 131 is turned on, so that the low-frequency component in the electrical signal of the first input terminal AC1 passes through the first inductor L1, and the high-frequency component passes through the second AC signal switching module 131; the third AC signal switching module 132 is turned on, so that the low frequency component of the electrical signal at the second input AC2 passes through the second inductor L2, and the high frequency component passes through the third AC signal switching module 132. In the second operation mode, the second ac signal switch module 131 and the third ac signal switch module 132 are always turned on;

in the first operation mode, the second ac signal switching module 131 and the third ac signal switching module 132 are turned off.

Referring to FIG. 13A, in the second operation mode, the second capacitor C_P2The resonant circuit formed with the first inductor L1 causes ringing in the waveform of the voltage signal at the first input terminal AC1, and the third capacitor C_P3The resonant circuit formed with the second inductor L2 causes ringing in the waveform of the voltage signal at the second input AC 2. In the embodiment of the invention, the second alternating current signal switch module can eliminate the ringing phenomenon of the amplitude reduction of the waveform of the voltage signal of the first input end AC1, and the third alternating current signal switch module can eliminate the voltage signal of the second input end AC2The amplitude reduction ringing phenomenon appears on the waveform, so that the normal work of the rectifier can be ensured, and the working stability of the rectifier is improved.

For example, when the sizes of the second semiconductor switch M3 and the fourth semiconductor switch M4 are large, the second semiconductor switch M3 does not need to be connected in parallel with the second capacitor C_P2The fourth semiconductor switch M4 does not need to be connected in parallel with the third capacitor C_P3In this case, the parasitic capacitance of the second semiconductor switch M3 forms a resonant circuit with the first inductor L1, and the parasitic capacitance of the fourth semiconductor switch M4 forms a resonant circuit with the second inductor L2. In the second operation mode, the resonant circuit formed by the parasitic capacitance of the second semiconductor switch M3 and the first inductor L1 affects the high frequency component of the electrical signal of the first input terminal AC1, and the first inductor L1 has a large blocking effect on the high frequency component, so that the ringing phenomenon occurs in the waveform of the voltage signal of the first input terminal AC 1. Meanwhile, the resonant circuit formed by the parasitic capacitance of the fourth semiconductor switch M4 and the second inductor L2 affects the high frequency component of the electrical signal of the second input terminal AC2, and the second inductor L2 has a large blocking effect on the high frequency component, so that the waveform of the voltage signal of the second input terminal AC2 exhibits ringing. When the waveforms of the voltage signals of the first input terminal AC1 and the second input terminal AC2 have ringing phenomena, the normal operation of the rectifier is directly affected, and the operation state of the rectifier is relatively unstable. According to the embodiment of the invention, the second alternating current signal switch module and the third alternating current signal switch module are adopted to enable the high-frequency component to pass through the second alternating current signal switch module and the third alternating current signal switch module, so that the high-frequency component is prevented from being blocked, the amplitude reduction ringing phenomenon of the waveforms of the voltage signals of the first input end AC1 and the second input end AC2 is eliminated, the normal work of the rectifier can be ensured, and the work stability of the rectifier is improved.

As shown in fig. 13A, the second ac signal switching module 131 may include: the sixth semiconductor switch M6 and the second bypass capacitor C2 connected in series, the sixth semiconductor switch M6 is connected to a driving control circuit CTRL, and the driving control circuit CTRL is configured to:

in the second operation mode, the sixth semiconductor switch M6 is turned on to turn on the second ac signal switching module 131;

in the first operation mode, the sixth semiconductor switch M6 is turned off to turn off the second ac signal switching module 131.

The third ac signal switching module 132 may include: the seventh semiconductor switch M7 and the third bypass capacitor C3 connected in series, the seventh semiconductor switch M7 is connected to a driving control circuit CTRL, and the driving control circuit CTRL is configured to:

in the second operation mode, the seventh semiconductor switch M7 is turned on to turn on the third ac signal switching module 132;

in the first operation mode, the seventh semiconductor switch M7 is turned off to turn off the third ac signal switching module 132.

In the embodiment of the present invention, in the second operation mode, the sixth semiconductor switch M6 and the seventh semiconductor switch M7 are always turned on, and the second bypass capacitor C2 is a low-impedance path for the high-frequency component in the electrical signal of the first input terminal AC1, so that the low-frequency component in the electrical signal of the first input terminal AC1 passes through the first inductor L1, and the high-frequency component passes through the second bypass capacitor C2; the third bypass capacitor C3 is also a low-impedance path for the high-frequency components in the electrical signal at the second input AC2, so that the low-frequency components in the electrical signal at the second input AC2 pass through the second inductor L2 and the high-frequency components pass through the third bypass capacitor C3.

Fig. 13B shows waveforms of the voltage signals of the first input terminal AC1 and the second input terminal AC2 in the second operation mode, and the waveform of the voltage signal of the first input terminal AC1 is the same as the waveform of the voltage signal of the second input terminal AC 2. The waveforms of the voltage signals of the first input terminal AC1 and the second input terminal AC2 are close to square waves, which is an important feature of the full-bridge class D rectifier. Meanwhile, since the rectifier includes the second and third AC

signal switching modules

131 and 132, the ringing phenomenon occurring in the waveforms of the voltage signals of the first and second input terminals AC1 and AC2 has been eliminated. Fig. 13C shows a waveform diagram of the voltage signal at the voltage output terminal Vo in the second operation mode. The abscissa in fig. 13B and 13C is time in microseconds and the ordinate is voltage value in volts.

In the first operation mode, the sixth semiconductor switch M6 and the seventh semiconductor switch M7 are always turned off, and the low-resistance path effect of the second bypass capacitor C2 and the third bypass capacitor C3 on the high-frequency component is released, so that the full-bridge class E rectifier has the characteristic that the function of the rectifier is similar to that of the full-bridge class E rectifier shown in fig. 4.

In summary, the rectifier provided in the embodiment of the present invention has a first operating mode and a second operating mode, in the first operating mode, the first semiconductor switch M1 always conducts the first upper bridge arm, the third semiconductor switch M2 always conducts the second upper bridge arm, and in different time periods, the second semiconductor switch M3 conducts the first lower bridge arm, and the fourth semiconductor switch M4 conducts the second lower bridge arm, so as to have the characteristics of a full-bridge class E rectifier, and be suitable for high operating frequency; in the second working mode, the two semiconductor switch groups are started at different time intervals, so that one of the two bridge arm groups is conducted and the other is closed in the same time interval, the characteristic of a full-bridge class D rectifier is achieved, the rectifier is suitable for low working frequency, and the rectifier can be switched between the first working mode and the second working mode to further adapt to different scenes. And the amplitude-reducing ringing phenomenon of the waveform of the voltage signal of the first input end AC1 is eliminated by the rectifier through the second alternating current signal switch module, and the amplitude-reducing ringing phenomenon of the waveform of the voltage signal of the second input end AC2 is eliminated by the third alternating current signal switch module, so that the normal work of the rectifier can be ensured, and the working stability of the rectifier is improved.

Fig. 14 exemplarily shows a circuit configuration diagram of a rectifier provided by the embodiment of the present invention, the rectifier is a full bridge rectifier, referring to fig. 14, the rectifier includes a first bridge arm, a second bridge arm, a first inductor L1, and a second inductor L2, the first bridge arm includes a first upper bridge arm 001 and a first lower bridge arm 002, the first upper bridge arm 001 is coupled between a first input terminal AC1 and a voltage output terminal Vo, and the first lower bridge arm 002 is coupled between a first input terminal AC1 and a ground terminal GND. The second leg comprises a second upper leg 003 and a second lower leg 004, the second upper leg 003 being coupled between the second input terminal AC2 and the voltage output Vo, the second lower leg 004 being coupled between the second input terminal AC2 and the ground terminal GND.

A first inductance L1 is arranged on the first lower leg 002 and is connected in series with the second semiconductor switch M3. The first inductor L1 may be disposed between the first input terminal AC1 and the second semiconductor switch M3, or between the second semiconductor switch M3 and the ground terminal.

A second inductance L2 is arranged on the second lower leg 004 and is connected in series with the fourth semiconductor switch M4. The second inductor L2 may be disposed between the second input terminal AC2 and the fourth semiconductor switch M4, or between the fourth semiconductor switch M4 and the ground terminal.

Referring to fig. 14, the rectifier may further include a second capacitor C_P2And a third capacitance C_P3. Wherein the second capacitor C_P2A third capacitor C arranged on the first upper arm 001 and connected in parallel with the first semiconductor switch M1_P3And is provided in second upper arm 003 in parallel with third semiconductor switch M2. Second capacitor C_P2A resonant circuit formed with the first inductor L1, and a third capacitor C_P3And the second inductor L2 form a resonant circuit, and the purpose of reducing EMI noise is achieved by the resonant circuit.

In the embodiment of the invention, the first semiconductor switch M1 is connected in parallel with the second capacitor C_P2The third semiconductor switch M2 is connected in parallel with a third capacitor C_P3Therefore, the first semiconductor switch M1 and the third semiconductor switch M2 can be smaller, so that the problem that the overall size of the rectifier is larger due to the larger size of the first semiconductor switch M1 and the third semiconductor switch M2 is avoided, and the occupied space of the rectifier is reduced.

Referring to fig. 14, the rectifier may further include a drive control circuit CTRL, the rectifier having a first operation mode and a second operation mode under the control of the drive control circuit CTRL, the drive control circuit CTRL being configured to:

in the first operation mode, the second semiconductor switch M3 is turned on to make the first lower arm 002 always conductive, the fourth semiconductor switch M4 is turned on to make the second lower arm 004 always conductive, and the first semiconductor switch M1 and the third semiconductor switch M2 are turned on at different time intervals to make one of the first upper arm 001 and the second upper arm 003 always conductive and the other one of the first upper arm and the second upper arm 003 always off in the same time interval. In this operation mode, the first inductor L1 and the second inductor L2 have a rectification characteristic, the second semiconductor switch M3 and the fourth semiconductor switch M4 are always turned on, the on-resistance of the second semiconductor switch M3 may be regarded as a part of the DCR of the first inductor L1, and the on-resistance of the fourth semiconductor switch M4 may be regarded as a part of the DCR of the second inductor L2, wherein the drive control circuit CTRL turns on the first semiconductor switch M1 and the third semiconductor switch M2 at different periods based on the magnitudes of the voltage of the first input terminal AC1, the voltage of the second input terminal AC2, the voltage of the voltage output terminal Vo, and the voltage of the ground terminal GND. The current signals at the first input terminal AC1 and the second input terminal AC2 are periodic signals, for example, the driving control circuit CTRL may turn on the first semiconductor switch M1 in the first half period and turn on the third semiconductor switch M2 in the second half period of each cycle, so as to supply current to the load in the whole cycle, thereby providing the features of a full-bridge class E rectifier, which functions similarly to the full-bridge class E rectifier shown in fig. 6. Since the second semiconductor switch M3 and the fourth semiconductor switch M4 are always turned on, the switching frequency of the rectifier is low, and the switching loss is small;

in the second operation mode, the two semiconductor switch groups are turned on in different time intervals, so that one of the two bridge arm groups is turned on and the other is turned off in the same time interval, one of the two semiconductor switch groups comprises a third semiconductor switch M2 and a second semiconductor switch M3, the other semiconductor switch group comprises a first semiconductor switch M1 and a fourth semiconductor switch M4, one of the two bridge arm groups comprises a first lower bridge arm 002 and a second upper bridge arm 003, and the other bridge arm group comprises a second lower bridge arm 004 and a first upper bridge arm 001. In this operation mode, the first inductor L1 is a low-impedance path for the alternating-current component in the electrical signal of the first input terminal AC1, i.e., has a small blocking effect on the alternating-current component, and the second inductor L2 is also a low-impedance path for the alternating-current component in the electrical signal of the second input terminal AC2, wherein the drive control circuit CTRL opens the two semiconductor switch groups at different periods based on the magnitudes of the voltage of the first input terminal AC1, the voltage of the second input terminal AC2, the voltage of the voltage output terminal Vo, and the voltage of the ground terminal GND. The current signals of the first input terminal AC1 and the second input terminal AC2 are periodic signals, for example, the driving control circuit CTRL may turn on the third semiconductor switch M2 and the second semiconductor switch M3 in the first half period of each cycle, and turn on the first semiconductor switch M1 and the fourth semiconductor switch M4 in the second half period of each cycle, so as to supply current to the load in the whole cycle, thereby providing the features of a full-bridge class D rectifier, which has the function similar to that of the full-bridge class D rectifier shown in fig. 2.

In summary, the rectifier provided in the embodiment of the present invention has the first operating mode and the second operating mode, in the first operating mode, the second semiconductor switch M3 always conducts the first lower bridge arm, the fourth semiconductor switch M4 always conducts the second lower bridge arm, and in different time periods, the first semiconductor switch M1 conducts the first upper bridge arm, and the third semiconductor switch M2 conducts the second upper bridge arm, so as to have the characteristics of a full-bridge class E rectifier, and be suitable for high operating frequency; in the second working mode, the two semiconductor switch groups are started at different time intervals, so that one of the two bridge arm groups is conducted and the other is closed in the same time interval, the characteristic of a full-bridge class D rectifier is achieved, the rectifier is suitable for low working frequency, and the rectifier can be switched between the first working mode and the second working mode to further adapt to different scenes.

Fig. 15 is a schematic circuit structure diagram of another rectifier provided on the basis of the rectifier shown in fig. 14 according to the embodiment of the present invention, the rectifier is a full bridge rectifier, and referring to fig. 15, the rectifier includes a first bridge arm, a second bridge arm, a first inductor L1, and a second inductor L2. The first leg comprises a first upper leg 001 and a first lower leg 002, the first upper leg 001 being coupled between the first input terminal AC1 and the voltage output Vo, the first lower leg 002 being coupled between the first input terminal AC1 and the ground terminal GND. The second leg comprises a second upper leg 003 and a second lower leg 004, the second upper leg 003 being coupled between the second input terminal AC2 and the voltage output Vo, the second lower leg 004 being coupled between the second input terminal AC2 and the ground terminal GND.

Optionally, referring to fig. 15, the rectifier may further include a second capacitor C_P2And a third capacitance C_P3. Wherein the second capacitor C_P2A third capacitor C arranged on the first upper arm 001 and connected in parallel with the first semiconductor switch M1_P3And is provided in second upper arm 003 in parallel with third semiconductor switch M2. Second capacitor C_P2A resonant circuit formed with the first inductor L1, and a third capacitor C_P3And the second inductor L2 form a resonant circuit, and the purpose of reducing EMI noise is achieved by the resonant circuit.

In the embodiment of the invention, the first semiconductor switch M1 is connected in parallel with the second capacitor C_P2The third semiconductor switch M2 is connected in parallel with a third capacitor C_P3Therefore, the first semiconductor switch M1 and the third semiconductor switch M2 can be smaller in size, thereby reducing the occupation space of the rectifier.

Referring to fig. 15, the rectifier further includes a drive control circuit CTRL, the rectifier having a first operating mode and a second operating mode under the control of the drive control circuit CTRL, the drive control circuit CTRL being configured to:

in the first working mode, the second semiconductor switch M3 is turned on to make the first lower bridge arm 002 always conductive, the fourth semiconductor switch M4 is turned on to make the second lower bridge arm 004 always conductive, and the first semiconductor switch M1 and the third semiconductor switch M2 are turned on at different time intervals to make one of the first upper bridge arm 001 and the second upper bridge arm 003 conductive and the other one is turned off in the same time interval, so that the characteristic of a full-bridge class E rectifier is provided, and the function of the rectifier is similar to that of the full-bridge class E rectifier shown in fig. 6;

Referring to fig. 15, the rectifier may further include: a second ac signal switching module 131 and a third ac signal switching module 132. The second ac signal switch module 131 is connected to the first inductor L1 in parallel and connected to the driving control circuit CTRL, and the third ac signal switch module 132 is connected to the second inductor L2 in parallel and connected to the driving control circuit CTRL. Correspondingly, the drive control circuit CTRL is also configured to:

Referring to fig. 15, in the second operation mode, the second capacitor C_P2The resonant circuit formed with the first inductor L1 causes ringing in the waveform of the voltage signal at the first input terminal AC1, and the third capacitor C_P3The resonant circuit formed with the second inductor L2 causes ringing in the waveform of the voltage signal at the second input AC 2. In the embodiment of the invention, the amplitude-reducing ringing phenomenon of the waveform of the voltage signal of the first input end AC1 can be eliminated through the second alternating current signal switch module, and the amplitude-reducing ringing phenomenon of the waveform of the voltage signal of the second input end AC2 can be eliminated through the third alternating current signal switch module, so that the normal work of the rectifier can be ensured, and the working stability of the rectifier is improved.

For example, when the sizes of the first semiconductor switch M1 and the third semiconductor switch M2 are large, the first semiconductor switch M1 does not need to be connected in parallel with the second capacitor C_P2The third semiconductor switch M2 does not need to be connected in parallel with the third capacitor C_P3In this case, the parasitic capacitance of the first semiconductor switch M1 forms a resonant circuit with the first inductor L1, the parasitic capacitance of the third semiconductor switch M2 forms a resonant circuit with the second inductor L2, in the second operation mode, the resonant circuit formed by the parasitic capacitance of the first semiconductor switch M1 and the first inductor L1 affects the high frequency component of the electrical signal of the first input terminal AC1, the first inductor L1 has a large blocking effect on the high frequency component, which causes the ringing phenomenon of the waveform of the voltage signal of the first input terminal AC1, meanwhile, a resonant circuit formed by the parasitic capacitance of the third semiconductor switch M2 and the second inductor L2 affects a high frequency component in the electrical signal of the second input terminal AC2, and the second inductor L2 also has a large blocking effect on the high frequency component, so that a ringing phenomenon occurs in the waveform of the voltage signal of the second input terminal AC 2. When the waveforms of the voltage signals of the first input terminal AC1 and the second input terminal AC2 have ringing phenomena, the normal operation of the rectifier is directly affected, and the operation state of the rectifier is relatively unstable. According to the embodiment of the invention, the second alternating current signal switch module and the third alternating current signal switch module are adopted, so that the high-frequency alternating current component passes through the second alternating current signal switch module and the third alternating current signal switch module, the high-frequency component is prevented from being blocked, the amplitude reduction ringing phenomenon of the waveforms of the voltage signals of the first input end AC1 and the second input end AC2 is eliminated, the normal work of the rectifier can be ensured, and the work stability of the rectifier is improved.

As shown in fig. 15, the second ac signal switching module 131 may include: the sixth semiconductor switch M6 and the second bypass capacitor C2 connected in series, the sixth semiconductor switch M6 is connected to a driving control circuit CTRL, and the driving control circuit CTRL is configured to:

In the embodiment of the present invention, in the second operation mode, the sixth semiconductor switch M6 and the seventh semiconductor switch M7 are always turned on, and the second bypass capacitor C2 is a low-impedance path for the high-frequency component in the electrical signal of the first input terminal AC1, so that the low-frequency component in the electrical signal of the first input terminal AC1 passes through the first inductor L1, and the high-frequency component passes through the second bypass capacitor C2; the third bypass capacitor C3 is also a low-impedance path for the high-frequency components in the electrical signal at the second input AC2, so that the low-frequency components in the electrical signal at the second input AC2 pass through the second inductor L2, and the high-frequency components pass through the third bypass capacitor C3.

In summary, the rectifier provided in the embodiment of the present invention has the first operating mode and the second operating mode, in the first operating mode, the second semiconductor switch M3 always conducts the first lower bridge arm, the fourth semiconductor switch M4 always conducts the second lower bridge arm, and in different time periods, the first semiconductor switch M1 conducts the first upper bridge arm, and the third semiconductor switch M2 conducts the second upper bridge arm, so as to have the characteristics of a full-bridge class E rectifier, and be suitable for high operating frequency; in the second working mode, the two semiconductor switch groups are started at different time intervals, so that one of the two bridge arm groups is conducted and the other is closed in the same time interval, the characteristic of a full-bridge class D rectifier is achieved, the rectifier is suitable for low working frequency, and the rectifier can be switched between the first working mode and the second working mode to further adapt to different scenes. And the amplitude-reducing ringing phenomenon of the waveform of the voltage signal of the first input end AC1 is eliminated by the rectifier through the second alternating current signal switch module, and the amplitude-reducing ringing phenomenon of the waveform of the voltage signal of the second input end AC2 is eliminated through the third alternating current signal switch module, so that the normal work of the rectifier can be ensured, and the working stability of the rectifier is improved.

It should be noted that the semiconductor switch according to the embodiment of the present invention may be a single semiconductor switching device, or may be a semiconductor switching device having a semiconductor switching function and including a plurality of circuit elements.

In the above embodiments, the semiconductor switch may be a transistor. For example, the Transistor may be a field effect Transistor (fet) or a Bipolar Junction Transistor (BJT). The transistor may be a Junction Field Effect Transistor (JFET), for example when the transistor is a field effect transistor, or may be a MOSFET. The transistors are further divided into P-type transistors and N-type transistors, in the embodiment of the present invention, the transistors may be P-type transistors or N-type transistors, and the type of the transistors is not limited in the embodiment of the present invention. Generally, a transistor has three poles, which are a Source (Source), a Gate (Gate), and a Drain (Drain) when the transistor is a field effect transistor, and an Emitter (Emitter), a Base (Base), and a Collector (Collector) when the transistor is a bipolar junction transistor. The circuit configuration of each rectifier shown in the above embodiments is explained by taking an example in which the semiconductor switch is an N-type MOSFET.

The output capacitor Co in the rectifier shown in each of the above embodiments is used to perform voltage stabilization processing on the dc signal converted by the finisher, so that the voltage output by the voltage output terminal Vo is more stable.

In the above embodiments, the control electrodes of the semiconductor switches are all connected to the output end of the driving control circuit, the output end is used for outputting the control signal, and the control signal is used for controlling the semiconductor switches to be turned on or turned off. Assuming that the semiconductor switch is a transistor, when the transistor is a field effect transistor, the grid electrode of the transistor is a control electrode, and the grid electrode is connected with the output end of the drive control circuit; when the transistor is a bipolar junction transistor, the base of the transistor is a control electrode, and the base is connected with the output end of the drive control circuit.

Optionally, the driving control circuit CTRL in the rectifier provided in the foregoing embodiments further includes a frequency discriminator, where the frequency discriminator is used to determine the operation mode to be entered according to the frequency of the electrical signal at the input terminal. The working mode to be entered is a first working mode or a second working mode. The driving control circuit CTRL is configured to implement AC-DC rectification by controlling the on/off of each semiconductor switch in the rectifier according to the operation mode to be entered, as determined by the frequency discriminator. The input terminal is a first input terminal, or the input terminal is a first input terminal and a second input terminal.

In the embodiments of the present application, after the frequency discriminator inside the driving control circuit CTRL determines the operation mode to be entered, the driving control circuit CTRL implements AC-DC rectification by controlling the on/off of each semiconductor device switch in the rectifier.

When the rectifier is a half-bridge rectifier, the frequency discriminator is connected with the first input end AC 1; when the rectifier is a full bridge rectifier, the frequency discriminator is connected to the first input AC1 and the second input AC 2.

Further, the driving control circuit CTRL further includes a voltage comparator, which is connected to the voltage output Vo, and is configured to detect whether the voltage at the voltage output is greater than a preset voltage, and instruct the frequency discriminator to determine the operating mode to be entered according to the frequency of the electrical signal at the input terminal when the voltage at the voltage output is greater than the preset voltage.

For example, the rectifier is the rectifier shown in fig. 8A, when the frequency discriminator determines that the operation mode to be entered is the first operation mode, the driving control circuit CTRL turns on the first semiconductor switch M1 so that the first upper arm 001 is always turned on, and periodically turns on or off the second semiconductor switch M3; when the frequency discriminator determines that the to-be-entered operation mode is the second operation mode, the driving control circuit CTRL turns on the first semiconductor switch M1 and the second semiconductor switch M3 at different time intervals, so that one of the first upper arm 001 and the first lower arm 002 is turned on and the other is turned off in the same time interval.

For example, the rectifier is the rectifier shown in fig. 10A, when the frequency discriminator determines that the operation mode to be entered is the first operation mode, the driving control circuit CTRL opens the second semiconductor switch M3 to make the first lower leg 002 always conductive, and periodically opens or closes the first semiconductor switch M1; when the frequency discriminator determines that the to-be-entered operation mode is the second operation mode, the driving control circuit CTRL turns on the first semiconductor switch M1 and the second semiconductor switch M3 at different time intervals, so that one of the first upper arm 001 and the first lower arm 002 is turned on and the other is turned off in the same time interval.

For example, the rectifier is the rectifier shown in fig. 12A, when the operation mode to be entered determined by the frequency discriminator is the first operation mode, the drive control circuit CTRL turns on the first semiconductor switch M1 to make the first upper arm 001 always conductive, turns on the third semiconductor switch M2 to make the second upper arm 003 always conductive, and turns on the second semiconductor switch M3 and the fourth semiconductor switch M4 at different time intervals to make one of the first lower arm 002 and the second lower arm 004 conductive and the other one off in the same time interval; when the working mode to be entered is determined to be the second working mode by the frequency discriminator, the drive control circuit CTRL turns on the two semiconductor switch groups at different time intervals, so that one of the two bridge arm groups is turned on and the other is turned off in the same time interval, one of the two semiconductor switch groups includes the third semiconductor switch M2 and the second semiconductor switch M3, the other includes the first semiconductor switch M1 and the fourth semiconductor switch M4, one of the two bridge arm groups includes the first lower bridge arm 002 and the second upper bridge arm 003, and the other includes the second lower bridge arm 004 and the first upper bridge arm 001.

For example, the rectifier is the rectifier shown in fig. 14, when the operation mode to be entered is determined by the frequency discriminator to be the first operation mode, the drive control circuit CTRL turns on the second semiconductor switch M3 to make the first lower arm 001 always conductive, turns on the fourth semiconductor switch M4 to make the second lower arm 004 always conductive, and turns on the first semiconductor switch M1 and the third semiconductor switch M2 at different time intervals to make one of the first upper arm 001 and the second upper arm 003 conductive and the other is off in the same time interval; when the working mode to be entered is determined to be the second working mode by the frequency discriminator, the drive control circuit CTRL turns on the two semiconductor switch groups at different time intervals, so that one of the two bridge arm groups is turned on and the other is turned off in the same time interval, one of the two semiconductor switch groups includes the third semiconductor switch M2 and the second semiconductor switch M3, the other includes the first semiconductor switch M1 and the fourth semiconductor switch M4, one of the two bridge arm groups includes the first lower bridge arm 002 and the second upper bridge arm 003, and the other includes the second lower bridge arm 004 and the first upper bridge arm 001.

An embodiment of the present invention further provides a method for driving a rectifier, where the rectifier is a rectifier shown in fig. 8A or fig. 10A, and as shown in fig. 16, the method may include:

step 1601, determining a working mode to be entered according to the frequency of the electrical signal at the first input end, where the working mode to be entered is a first working mode or a second working mode.

And when the voltage of the voltage output end is greater than the preset voltage, the rectifier determines the working mode to be entered according to the frequency of the electric signal of the first input end.

The first operating mode is suitable for high operating frequencies and the second operating mode is suitable for low operating frequencies. Illustratively, the first mode of operation is applicable to an operating frequency of 6.78 MHz; the second working mode is suitable for the working frequency of 100-205 KHz. Each operating mode corresponds to a WPT technique, for example, the first operating mode corresponds to a magnetic resonance technique and the second operating mode corresponds to a magnetic induction technique.

And step 1602, controlling the first upper bridge arm and the first lower bridge arm to be switched on or off according to the determined work mode to be entered.

Optionally, when the rectifier is the rectifier shown in fig. 8A, controlling the first upper bridge arm and the first lower bridge arm to be turned on or off according to the determined work mode to be entered may include:

1) in the first operation mode, the first semiconductor switch M1 is turned on by the driving control circuit to make the first upper arm 001 always conducting, and the second semiconductor switch M3 is turned on or off periodically.

2) In the second operation mode, the first semiconductor switch M1 and the second semiconductor switch M3 are turned on by the driving control circuit at different time intervals, so that one of the first upper arm 001 and the first lower arm 002 is turned on and the other is turned off in the same time interval.

When the rectifier is the rectifier shown in fig. 10A, controlling the first upper bridge arm and the first lower bridge arm to be turned on or off according to the determined operation mode to be entered may include:

1) in the first operation mode, the second semiconductor switch M3 is turned on by the driving control circuit to make the first lower arm 002 always conductive, and the first semiconductor switch M1 is turned on or off periodically.

Optionally, as shown in fig. 9 and 11, the rectifier may further include: the first ac signal switching module 91, the driving method may further include: in a second working mode, the first alternating current signal switch module is started through the driving control circuit, so that low-frequency components in an electric signal of the first input end AC1 pass through the first inductor L1, and high-frequency components pass through the first alternating current signal switch module; and under the first working mode, the first alternating current signal switch module is closed through the driving control circuit.

In summary, the driving method of the rectifier provided in the embodiment of the present invention can determine the working mode to be entered according to the frequency of the electrical signal at the first input end, and control the first upper bridge arm and the first lower bridge arm to be turned on or off according to the determined working mode to be entered, so that the rectifier realizes the function of the half-bridge class E rectifier in the first working mode to be suitable for high working frequency, so that the rectifier has the characteristics of the half-bridge class D rectifier in the second working mode to be suitable for low working frequency, and the rectifier can be switched between the first working mode and the second working mode to further adapt to different scenarios. By the driving method, the phenomenon of amplitude reduction ringing of the waveform of the voltage signal of the first input end AC1 can be eliminated, normal work of the rectifier can be further ensured, and the working stability of the finisher is improved.

An embodiment of the present invention further provides a method for driving a rectifier, where the rectifier is a rectifier shown in fig. 12A, 12B, or 14, and the method may include:

1. when the voltage of the voltage output end is larger than the preset voltage, determining a working mode to be entered according to the frequency of the electric signals of the first input end and the second input end, wherein the working mode to be entered is a first working mode or a second working mode.

The first operating mode is suitable for high operating frequencies and the second operating mode is suitable for low operating frequencies.

2. And controlling the first upper bridge arm and the first lower bridge arm to be switched on or off according to the determined working mode to be entered.

3. And controlling the second upper bridge arm and the second lower bridge arm to be switched on or off according to the determined working mode to be entered.

For example, when the rectifier is the rectifier shown in fig. 12A or 12B, controlling the first upper bridge arm, the first lower bridge arm, the second upper bridge arm, and the second lower bridge arm to be turned on or off according to the determined current operating mode may include:

1) in the first operating mode, the drive control circuit turns on the first semiconductor switch M1 to make the first upper arm 001 always conductive, turns on the third semiconductor switch M2 to make the second upper arm 003 always conductive, and turns on the second semiconductor switch M3 and the fourth semiconductor switch M4 at different time intervals to make one of the first lower arm 002 and the second lower arm 004 conductive and the other one off in the same time interval.

2) In the second working mode, the two semiconductor switch groups are started in different time intervals through the driving control circuit, so that one of the two bridge arm groups is conducted, the other one of the two bridge arm groups is closed, one of the two semiconductor switch groups comprises a third semiconductor switch M2 and a second semiconductor switch M3, the other one of the two semiconductor switch groups comprises a first semiconductor switch M1 and a fourth semiconductor switch M4, one of the two bridge arm groups comprises a first lower bridge arm 002 and a second upper bridge arm 003, and the other one of the two bridge arm groups comprises a second lower bridge arm 004 and a first upper bridge arm 001.

For example, when the rectifier is the rectifier shown in fig. 14, controlling the first upper bridge arm, the first lower bridge arm, the second upper bridge arm, and the second lower bridge arm to be turned on or off according to the determined operation mode to be entered may include:

1) in the first operating mode, the second semiconductor switch M3 is turned on by the drive control circuit to make the first lower arm 001 always conductive, the fourth semiconductor switch M4 is turned on to make the second lower arm 004 always conductive, and the first semiconductor switch M1 and the third semiconductor switch M2 are turned on at different time intervals to make one of the first upper arm 001 and the second upper arm 003 conductive and the other one off in the same time interval.

Optionally, as shown in fig. 13A and fig. 15, the rectifier may further include: the second ac signal switching module 131 and the third ac signal switching module 132, the driving method may further include: in the second working mode, the second AC signal switching module 131 is turned on by the driving control circuit, so that the low-frequency component in the electrical signal of the first input terminal AC1 passes through the first inductor L1, and the high-frequency component passes through the second AC signal switching module; the third AC signal switch module 132 is turned on by the driving control circuit, so that the low frequency component in the electrical signal of the second input AC2 passes through the second inductor L2, and the high frequency component passes through the third AC signal switch module 132; in the first operation mode, the second ac signal switching module 131 and the third ac signal switching module 132 are turned off by the driving control circuit.

In summary, the driving method of the rectifier provided in the embodiment of the present invention can determine the working mode to be entered according to the frequencies of the electrical signals of the first input end and the second input end, and control the conduction or the shutdown of the first upper bridge arm, the first lower bridge arm, the second upper bridge arm, and the second lower bridge arm according to the determined working mode to be entered, so that the rectifier has the characteristics of a full-bridge class E rectifier in the first working mode, is suitable for a high working frequency, has the characteristics of a full-bridge class D rectifier in the second working mode, is suitable for a low working frequency, and can switch between the first working mode and the second working mode, thereby adapting to different scenes. By the driving method, amplitude-reduction ringing phenomena occurring on the waveforms of the voltage signals of the first input end AC1 and the second input end AC2 can be eliminated, normal work of the rectifier can be guaranteed, and work stability of the rectifier is improved.

It should be noted that, the sequence of the steps of the driving method of the rectifier provided in the embodiment of the present invention may be appropriately adjusted, and the steps may also be increased or decreased according to the circumstances, and any method that can be easily conceived by a person skilled in the art within the technical scope of the present disclosure should be included in the protection scope of the present disclosure, and therefore, the details are not described again.

The embodiment of the present invention further provides a chip, where the chip includes a programmable logic circuit and/or stores program instructions, and is used to implement the driving method of the rectifier provided in the above embodiment.

The embodiment of the present invention further provides a chip, which is shown in fig. 7 and includes a rectifier 021, and a resonant circuit 022 and an output capacitor Co connected to the rectifier 021.

The rectifier 021 is any one of the rectifiers provided in the above embodiments, and may be, for example, the rectifier shown in fig. 8A, fig. 8B, fig. 9, fig. 10A, fig. 10B, fig. 11, fig. 12A, fig. 12B, fig. 13A, fig. 14 or fig. 15.

The resonant circuit 022 is configured to receive an electrical signal sent by a sending-end device and provide the electrical signal to an input terminal of the rectifier, where the input terminal is a first input terminal, or the input terminal is a first input terminal and a second input terminal. Resonant circuit 022 may include a receive coil L_RAnd a resonance capacitor C_R。

The embodiment of the invention also provides electronic equipment loaded with the chip shown in the figure 7.

It will be understood by those skilled in the art that all or part of the steps in the driving method in the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disk, or the like.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

A rectifier is characterized by comprising a first bridge arm and a first inductor, wherein the first bridge arm comprises a first upper bridge arm and a first lower bridge arm, the first upper bridge arm is coupled between a first input end and a voltage output end, the first lower bridge arm is coupled between the first input end and a ground end,

a first semiconductor switch is arranged on the first upper bridge arm;

a second semiconductor switch is arranged on the first lower bridge arm;

the first inductor is arranged on the first upper bridge arm and is connected in series with the first semiconductor switch, or the first inductor is arranged on the first lower bridge arm and is connected in series with the second semiconductor switch.
The rectifier of claim 1 further comprising a drive control circuit, the rectifier having a first mode of operation and a second mode of operation under control of the drive control circuit, the drive control circuit being configured to:

in the first working mode, when the first inductor is arranged on the first upper bridge arm, the first semiconductor switch is turned on, and the second semiconductor switch is turned on or off periodically; when the first inductor is arranged on the first lower bridge arm, the second semiconductor switch is turned on, and the first semiconductor switch is periodically turned on or off;

in the second operating mode, the first semiconductor switch and the second semiconductor switch are turned on for different periods of time.
The rectifier of claim 1 further comprising a second leg and a second inductor, the second leg comprising a second upper leg and a second lower leg, the second upper leg coupled between a second input terminal and the voltage output terminal, the second lower leg coupled between the second input terminal and the ground terminal,

a third semiconductor switch is arranged on the second upper bridge arm;

a fourth semiconductor switch is arranged on the second lower bridge arm;

the arrangement of the first inductance and the second inductance corresponds to one of the following situations:

the first inductor is arranged on the first upper bridge arm, and the second inductor is arranged on the second upper bridge arm and is connected with the third semiconductor switch in series; alternatively, the first and second electrodes may be,

the first inductor is arranged on the first lower bridge arm, and the second inductor is arranged on the second lower bridge arm and is connected with the fourth semiconductor switch in series.
The rectifier of claim 3 further comprising a drive control circuit, the rectifier having a first mode of operation and a second mode of operation under control of the drive control circuit, the drive control circuit being configured to:

in the first working mode, when the first inductor is arranged on the first upper bridge arm and the second inductor is arranged on the second upper bridge arm, the first semiconductor switch is turned on, the third semiconductor switch is turned on, and the second semiconductor switch and the fourth semiconductor switch are turned on at different time intervals; when the first inductor is arranged on the first lower bridge arm and the second inductor is arranged on the second lower bridge arm, the second semiconductor switch is turned on, the fourth semiconductor switch is turned on, and the first semiconductor switch and the third semiconductor switch are turned on at different time intervals;

and in the second working mode, two semiconductor switch groups are started at different time intervals so as to enable one of the two bridge arm groups to be conducted and the other to be closed in the same time interval, one of the two semiconductor switch groups comprises the third semiconductor switch and the second semiconductor switch, the other semiconductor switch group comprises the first semiconductor switch and the fourth semiconductor switch, one of the two bridge arm groups comprises the first lower bridge arm and the second upper bridge arm, and the other bridge arm group comprises the second lower bridge arm and the first upper bridge arm.
The rectifier of claim 2 further comprising: and the first alternating current signal switch module is connected with the first inductor in parallel and is connected with the drive control circuit.
The rectifier of claim 5, wherein the drive control circuit is further configured to:

in the second working mode, the first alternating current signal switch module is started, so that the low-frequency component and the high-frequency component of the electric signal at the first input end pass through the first inductor, and the high-frequency component passes through the first alternating current signal switch module;

and under the first working mode, the first alternating current signal switch module is closed.
The rectifier of claim 5, wherein the first AC signal switching module comprises: a fifth semiconductor switch and a first bypass capacitor connected in series, the fifth semiconductor switch being connected to the drive control circuit.
The rectifier of claim 7, wherein the drive control circuit is configured to:

in the second working mode, the fifth semiconductor switch is turned on to turn on the first alternating current signal switch module;

and in the first working mode, the fifth semiconductor switch is closed to close the first alternating current signal switch module.
The rectifier of claim 1, 2, 5, 6, 7, or 8 further comprising a first capacitor,

the first inductor is arranged on the first upper bridge arm, and the first capacitor is arranged on the first lower bridge arm and is connected with the second semiconductor switch in parallel.
The rectifier of claim 1, 2, 5, 6, 7, or 8 further comprising a first capacitor,

the first inductor is arranged on the first lower bridge arm, and the first capacitor is arranged on the first upper bridge arm and is connected with the first semiconductor switch in parallel.
The rectifier of claim 4 further comprising: a second alternating current signal switch module and a third alternating current signal switch module,

the second alternating current signal switch module is connected with the first inductor in parallel and is connected with the driving control circuit,

the third alternating current signal switch module is connected with the second inductor in parallel and is connected with the driving control circuit.
The rectifier of claim 11, wherein the drive control circuit is further configured to:

in the second working mode, the second alternating current signal switch module is started, so that the low-frequency component and the high-frequency component of the electric signal at the first input end pass through the first inductor, and the high-frequency component passes through the second alternating current signal switch module; turning on the third alternating current signal switch module so that the low-frequency component and the high-frequency component of the electric signal at the second input end pass through the second inductor and the third alternating current signal switch module;

and under the first working mode, the second alternating current signal switch module and the third alternating current signal switch module are closed.
The rectifier according to claim 11,

the second ac signal switch module includes: a sixth semiconductor switch and a second bypass capacitor connected in series, the sixth semiconductor switch being connected to the drive control circuit;

the third ac signal switching module includes: a seventh semiconductor switch and a third bypass capacitor connected in series, the seventh semiconductor switch being connected to the drive control circuit.
The rectifier according to claim 13,

the drive control circuit is configured to: in the second working mode, the sixth semiconductor switch is turned on to turn on the second alternating current signal switch module; in the first working mode, the sixth semiconductor switch is turned off to turn off the second alternating current signal switch module;

the drive control circuit is configured to: in the second working mode, the seventh semiconductor switch is turned on to turn on the third alternating current signal switch module; and in the first working mode, the seventh semiconductor switch is turned off to turn off the third alternating current signal switch module.
The rectifier of claim 3, 4, 11, 12, 13 or 14 further comprising a second capacitor and a third capacitor,

the first inductor is arranged on the first upper bridge arm, the second inductor is arranged on the second upper bridge arm, the second capacitor is arranged on the first lower bridge arm and is connected with the second semiconductor switch in parallel, and the third capacitor is arranged on the second lower bridge arm and is connected with the fourth semiconductor switch in parallel.
The rectifier of claim 3, 4, 11, 12, 13 or 14 further comprising a second capacitor and a third capacitor,

the first inductor is arranged on the first lower bridge arm, the second inductor is arranged on the second lower bridge arm, the second capacitor is arranged on the first upper bridge arm and is connected with the first semiconductor switch in parallel, and the third capacitor is arranged on the second upper bridge arm and is connected with the third semiconductor switch in parallel.
The rectifier of claim 3, 4, 11, 12, 13, 14, 15 or 16 wherein the first semiconductor switch, second semiconductor switch, third semiconductor switch or fourth semiconductor switch is a transistor.
The rectifier of claim 2, 4, 5, 6, 7, 8, 11, 12, 13, 14, 15, 16 or 17, wherein the control electrodes of the semiconductor switches are all connected to an output terminal of the driving control circuit, and the output terminal is used for outputting a control signal which is used for controlling the semiconductor switches to be turned on or turned off.
The rectifier of claim 2, 4, 5, 6, 7, 8, 11, 12, 13, 14, 15, 16, 17 or 18 wherein the drive control circuit includes a frequency discriminator therein,

the frequency discriminator is used for determining a working mode to be entered according to the frequency of the electric signal of the input end, the working mode to be entered is the first working mode or the second working mode, and the input end is the first input end, or the input end is the first input end and the second input end.
A driving method of a rectifier is characterized in that the driving method is used in the rectifier, the rectifier comprises a first bridge arm and a first inductor, the first bridge arm comprises a first upper bridge arm and a first lower bridge arm, the first upper bridge arm is coupled between a first input end and a voltage output end, the first lower bridge arm is coupled between the first input end and a ground end, the first upper bridge arm is provided with a first semiconductor switch, the first lower bridge arm is provided with a second semiconductor switch, the first inductor is arranged on the first upper bridge arm or the first lower bridge arm,

the method comprises the following steps:

determining a working mode to be entered according to the frequency of an electric signal at an input end, wherein the working mode to be entered is the first working mode or the second working mode, and the input end comprises a first input end;

and controlling the first upper bridge arm and the first lower bridge arm to be switched on or off according to the determined work mode to be entered.
The method of claim 20, wherein the rectifier further comprises a drive control circuit,

the controlling the first upper bridge arm and the first lower bridge arm to be switched on or off according to the determined work mode to be entered includes:

in the first working mode, when the first inductor is arranged on the first upper bridge arm, the first semiconductor switch is turned on through the drive control circuit, and the second semiconductor switch is turned on or off periodically; when the first inductor is arranged on the first lower bridge arm, the second semiconductor switch is turned on through the driving control circuit, and the first semiconductor switch is turned on or turned off periodically;

in the second operation mode, the first semiconductor switch and the second semiconductor switch are turned on at different periods by the drive control circuit.
The method of claim 20, wherein the rectifier further comprises a second leg and a second inductor, the second leg comprises a second upper leg and a second lower leg, the second upper leg is coupled between a second input terminal and the voltage output terminal, the second lower leg is coupled between the second input terminal and the ground terminal, the second upper leg has a third semiconductor switch disposed thereon, the second lower leg has a fourth semiconductor switch disposed thereon, and the arrangement of the first inductor and the second inductor corresponds to one of: the first inductor is arranged on the first upper bridge arm, and the second inductor is arranged on the second upper bridge arm and is connected with the third semiconductor switch in series; or, the first inductor is disposed on the first lower bridge arm, the second inductor is disposed on the second lower bridge arm and is connected in series with the fourth semiconductor switch, the input end further includes the second input end,

the method further comprises the following steps:

and controlling the second upper bridge arm and the second lower bridge arm to be switched on or off according to the determined working mode to be entered.
The method of claim 22, wherein the rectifier further comprises a drive control circuit,

controlling the first upper bridge arm, the first lower bridge arm, the second upper bridge arm and the second lower bridge arm to be switched on or off according to the determined work mode to be entered, including:

in the first working mode, when the first inductor is arranged on the first upper bridge arm and the second inductor is arranged on the second upper bridge arm, the first semiconductor switch is turned on through the drive control circuit, the third semiconductor switch is turned on, and the second semiconductor switch and the fourth semiconductor switch are turned on at different time intervals; when the first inductor is arranged on the first lower bridge arm and the second inductor is arranged on the second lower bridge arm, the second semiconductor switch is turned on through the driving control circuit, the fourth semiconductor switch is turned on, and the first semiconductor switch and the third semiconductor switch are turned on at different time intervals;

in the second working mode, the two semiconductor switch groups are started at different time intervals through the drive control circuit, so that one of the two bridge arm groups is conducted, and the other is closed, one of the two semiconductor switch groups comprises the third semiconductor switch and the second semiconductor switch, the other semiconductor switch group comprises the first semiconductor switch and the fourth semiconductor switch, one of the two bridge arm groups comprises the first lower bridge arm and the second upper bridge arm, and the other bridge arm group comprises the second lower bridge arm and the first upper bridge arm.
The method of claim 21, wherein the rectifier further comprises: a first alternating current signal switch module, a second alternating current signal switch module,

the method further comprises the following steps:

in the second working mode, the first alternating current signal switch module is started through the driving control circuit, so that low-frequency components in the electric signal of the first input end pass through the first inductor, and high-frequency components pass through the first alternating current signal switch module;

and under the first working mode, the first alternating current signal switch module is closed through the driving control circuit.
The method of claim 23, wherein the rectifier further comprises: a second alternating current signal switch module and a third alternating current signal switch module,

the method further comprises the following steps:

in the second working mode, the second alternating current signal switch module is started through the driving control circuit, so that the low-frequency component and the high-frequency component of the electric signal at the first input end pass through the first inductor, and the high-frequency component passes through the second alternating current signal switch module; the third alternating current signal switch module is started through the driving control circuit, so that the low-frequency component and the high-frequency component of the electric signal at the second input end pass through the second inductor, and the high-frequency component passes through the third alternating current signal switch module;

and in the first working mode, the second alternating current signal switch module and the third alternating current signal switch module are closed through the driving control circuit.
A chip comprising programmable logic and/or stored program instructions for implementing a method of driving a rectifier as claimed in any one of claims 20 to 25.
A chip is characterized by comprising a rectifier, a resonant circuit and an output capacitor, wherein the resonant circuit and the output capacitor are connected with the rectifier,

the rectifier is as claimed in any one of claims 1 to 19;

the resonance circuit is used for receiving an electrical signal sent by sending end equipment and providing the electrical signal to an input end of the rectifier, wherein the input end is a first input end, or the input end is a first input end and a second input end;

and the output capacitor is used for carrying out voltage stabilization treatment on the direct current signal converted by the rectifier and providing the direct current signal to a load.
An electronic device loaded with the chip of claim 27.