CN112152431B

CN112152431B - Control device and control method for switching device, switching power supply device and chip

Info

Publication number: CN112152431B
Application number: CN202010314109.8A
Authority: CN
Inventors: 宗强; 刘准; 方芳; 杨永良
Original assignee: Shenzhen Chip Hope Micro-Electronics Ltd
Current assignee: Shenzhen Chip Hope Micro-Electronics Ltd
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2022-05-10
Anticipated expiration: 2040-04-20
Also published as: CN112152431A

Abstract

The application discloses a control device and a control method of a switching device, a switching power supply device and a chip. The control device is used for outputting a driving signal for driving the switching device based on the received control signal and the logic signal; wherein the control of the switching timing of the switching device between the first state and the second state by the drive signal is associated with the control signal, and the control of the switching speed of the switching device between the first state and the second state by the drive signal is associated with the logic signal, such that the switching speeds of the switching device between the first state and the second state are different for at least two adjacent switching cycles.

Description

Control device and control method for switching device, switching power supply device and chip

Technical Field

The present disclosure relates to the field of control circuits, and in particular, to a switching device control apparatus and method, a switching power supply apparatus, and a chip.

Background

Switching devices are used in almost all electronic manufacturing industries, including electronic terminals, servers, displays, and various peripherals, various instruments and meters, various control devices, and the like. Besides ensuring the normal operation of these devices, the switching device can also assist the electronic devices to change the electric energy and effectively reduce the energy consumption of the electronic devices by virtue of the switching characteristics of the switching device.

Meanwhile, the switching characteristics of the switching device enable the switching device to operate in a fast-cycling switching state of on and off for a long time, and an electric signal is continuously and rapidly converted, so that generated surge current and peak voltage form an Interference source, and serious Electromagnetic Interference (EMI) is caused.

EMI is electronic noise that interferes with electrical signals and reduces signal integrity, the presence of which can reduce the quality of transmitted signals, interfere with, and even destroy, circuits and equipment, making them unable to meet the specifications set by the electromagnetic compatibility standards. Therefore, it is desirable to provide a control scheme for the switching device to suppress EMI generated during operation thereof.

Disclosure of Invention

In view of the above-described drawbacks of the related art, an object of the present application is to provide a control apparatus and a control method for a switching device, a switching power supply apparatus, and a chip.

To achieve the above and other related objects, a first aspect of the present application discloses a control apparatus for a switching device, for outputting a driving signal for driving the switching device based on a received control signal and a logic signal; wherein the control of the switching timing of the switching device between the first state and the second state by the drive signal is associated with the control signal, and the control of the switching speed of the switching device between the first state and the second state by the drive signal is associated with the logic signal, such that the switching speeds of the switching device between the first state and the second state are different for at least two adjacent switching cycles.

In certain embodiments of the first aspect of the present application, the control signal and the logic signal are independent of each other.

In certain embodiments of the first aspect of the present application, the logic signal varies with a period not less than one switching period of the switching device.

In certain embodiments of the first aspect of the present application, the driving signal changes a switching speed of the switching device by an internal resistance value or an internal current change of the control device.

In certain embodiments of the first aspect of the present application, the control device comprises a main switching module for performing an on or off operation under control of the control signal to generate the driving signal, and a speed switching module; the speed switching module is coupled to the main switching module and is used for being controlled by the logic signal to change the switching speed of the driving signal for driving the switching device to switch between the first state and the second state, so that the switching speed of the switching device between the first state and the second state in adjacent switching cycles is different.

In certain embodiments of the first aspect of the present application, the control device further comprises a logic control module for generating the logic signal that varies in time sequence.

In certain embodiments of the first aspect of the present application, the logic control module comprises a clock generation circuit and a first logic circuit, the clock generation circuit to output a clock pulse signal; the first logic circuit is coupled to the clock generating circuit and configured to output a first logic signal varying in time sequence based on the clock pulse signal, wherein the logic signal is represented by the first logic signal.

In certain embodiments of the first aspect of the present application, the logic control module further comprises a second logic circuit, coupled to the clock generation circuit, for outputting a second logic signal varying in time sequence based on the clock pulse signal; wherein the logic signal is represented by the first logic signal and the second logic signal, the first logic signal is used for controlling the speed switching module to change the switching speed of the switching device from the first state to the second state, and the second logic signal is used for controlling the speed switching module to change the switching speed of the switching device from the second state to the first state.

In certain embodiments of the first aspect of the present application, the speed switching module comprises an on speed switching unit and/or an off speed switching unit; the on-speed switching unit is used for changing the switching speed of the driving signal for controlling the switching device to be switched from the first state to the second state based on the logic signal, and the off-speed switching unit is used for changing the switching speed of the driving signal for controlling the switching device to be switched from the second state to the first state based on the logic signal.

In certain embodiments of the first aspect of the present application, the conduction speed switching unit includes at least one set of first switching circuits, and the first switching circuits are selectively turned on in time sequence based on the logic signal to change a switching speed at which the driving signal controls the switching device to switch from the first state to the second state.

In certain embodiments of the first aspect of the present application, the first switching circuit comprises: the first switch tube is coupled with the main switch module and is used for being controlled to be switched on or switched off by the logic signal; and, a first resistive circuit or a first current source; the first resistive circuit is connected with the first switching tube in series; or the first current source is connected in series with the first switch tube.

In certain embodiments of the first aspect of the present application, the turn-off speed switching unit includes at least one set of second switching circuits for selectively turning on in time series based on the logic signal to change a switching speed at which the driving signal controls the switching device to switch from the second state to the first state.

In certain embodiments of the first aspect of the present application, the second switching circuit comprises: the second switch tube is coupled with the main switch module and is used for being controlled to be switched on or switched off by the logic signal; and, a second resistive circuit or a second current source; the second resistive circuit is connected in series with the second switching tube; or the second current source is connected with the second switch tube in series.

In certain embodiments of the first aspect of the present application, the main switching module comprises a first main switching unit and a second main switching unit; when the first main switch unit is controlled by the control signal to be switched on, the second main switch unit is switched off, and when the first main switch unit is controlled by the control signal to be switched off, the second main switch unit is switched on.

In certain embodiments of the first aspect of the present application, the control apparatus further comprises a driving control module for detecting an electrical signal flowing through the switching device and outputting the control signal to the main switching module based on a detection result.

A second aspect of the present application discloses a control chip, which is packaged with any of the control devices disclosed in the first aspect of the present application.

A third aspect of the present application discloses a switching power supply device including: a rectifying circuit for receiving an external driving signal to output a rectified signal; any of the control devices disclosed in the first aspect of the present application, configured to output a drive signal; a switching device, a control end of which is coupled with the control device, and is used for switching between a first state and a second state based on the driving signal, and the switching speed between the first state and the second state is different in at least two adjacent switching cycles; and the energy conversion circuit is coupled between the rectifying circuit and the switching device and used for performing energy conversion on the received signal based on the first state or the second state of the switching device so as to output stable power to a load.

In some embodiments of the third aspect of the present application, the switching power supply device further includes a filtering circuit coupled to a line between the rectifying circuit and the energy conversion circuit, for filtering the rectified signal output from the rectifying circuit to output a filtered signal to the energy conversion circuit.

A fourth aspect of the present application discloses a method for controlling a switching device, comprising the steps of: acquiring a control signal and a logic signal; outputting a driving signal for driving the switching device based on the control signal and the logic signal; wherein the control of the switching timing of the switching device between the first state and the second state by the drive signal is associated with the control signal, and the control of the switching speed of the switching device between the first state and the second state by the drive signal is associated with the logic signal, such that the switching speeds of the switching device between the first state and the second state are different for at least two adjacent switching cycles.

In certain embodiments of the fourth aspect of the present application, the control signal and the logic signal are independent of each other.

In certain embodiments of the fourth aspect of the present application, the method further comprises the step of generating the logic signal that varies in time sequence.

In certain embodiments of the fourth aspect of the present application, further comprising the step of detecting an electrical signal flowing through the switching device, and outputting the control signal based on the detection result.

In certain embodiments of the fourth aspect of the present application, the outputting a drive signal to drive the switching device based on the control signal and a logic signal comprises: a main switch module is switched on or switched off based on the control signal to output the driving signal; changing a switching speed of the drive signal to the switching device between the first state and the second state based on the logic signal such that the switching speed of the switching device is different between the first state and the second state for adjacent switching cycles.

In summary, the control device and the control method for the switching device, the switching power supply device, and the chip disclosed in the present application enable the switching speeds of at least two adjacent switching period switching devices to be different by changing the on/off switching speeds of the switching devices in different switching periods, so as to disperse the electromagnetic interference generated by driving the switching devices at the same frequency, thereby effectively reducing the EMI.

Drawings

Specific features of the invention to which this application relates are set forth in the following claims. The features and advantages of the invention to which this application relates will be better understood by reference to the exemplary embodiments described in detail below and the accompanying drawings. The brief description of the drawings is as follows:

fig. 1 shows waveforms of signals and waveforms of states of switching devices in an embodiment of the present application.

Fig. 2 is a circuit block diagram of a control device according to an embodiment of the present invention.

Fig. 3 is a circuit block diagram of another embodiment of the control device of the present application.

Fig. 4 is a circuit block diagram of a main switch module according to an embodiment of the present application.

Fig. 5 is a schematic circuit diagram of a main switch module according to an embodiment of the present disclosure.

Fig. 6 is a schematic circuit diagram of an on-speed switching unit according to an example of the present application.

Fig. 7 is a schematic circuit diagram of an on-speed switching unit according to another example of the present application.

Fig. 8 is a waveform diagram of a logic signal according to an embodiment of the present application.

Fig. 9 is a schematic circuit diagram of an off-speed switching unit according to an example of the present application.

Fig. 10 is a schematic circuit diagram of an off-speed switching unit according to another example of the present application.

Fig. 11 is a circuit block diagram of a speed switching module according to an embodiment of the present application.

Fig. 12 is a block circuit diagram of a control device according to the present application in a further embodiment.

FIG. 13 is a block circuit diagram of a logic control module according to an embodiment of the present application.

Fig. 14 is a circuit block diagram of a logic control module according to another embodiment of the present application.

Fig. 15 is a circuit block diagram of a switching power supply device according to an embodiment of the present invention.

Fig. 16 is a circuit block diagram of a switching power supply device according to still another embodiment of the present invention.

FIG. 17 is a flow chart of an embodiment of the control method of the present application.

Detailed Description

The following description of the embodiments of the present application is provided for illustrative purposes, and other advantages and capabilities of the present application will become apparent to those skilled in the art from the present disclosure.

In the following description, reference is made to the accompanying drawings that describe several embodiments of the application. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present disclosure. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present application is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "above," "upper," and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature as illustrated in the figures.

Although the terms first, second, etc. may be used herein to describe various elements or parameters in some instances, these elements or parameters should not be limited by these terms. These terms are only used to distinguish one element or parameter from another element or parameter. For example, a first switch tube may be referred to as a second switch tube, and similarly, a second switch tube may be referred to as a first switch tube, without departing from the scope of the various described embodiments. The first switch tube and the second switch tube are both described as one switch tube, but they are not the same switch tube unless the context clearly indicates otherwise. The similar situation also includes a first resistive circuit and a second resistive circuit, or a first current source and a second current source, or a first logic circuit and a second logic circuit, etc.

Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

In addition, it should be noted that the present disclosure is described below in terms of various embodiments in order to clearly illustrate various inventive features disclosed herein. But not to mean that the various embodiments can only be practiced individually. One skilled in the art may design the available embodiments according to the requirements, or only replaceable components/modules in different embodiments may be replaced according to the design requirements. In other words, the embodiments taught by the present disclosure are not limited to the aspects described in the following embodiments, but include substitutions and permutations and combinations of various embodiments/components/modules as may be made herein before.

The switching device is generally served in the electronic industry together with other electronic components or circuits, and for example, a switching power supply composed of the switching device, a control circuit thereof, and a power conversion circuit has the advantages of low power consumption, high efficiency, small size, light weight, stable operation, safety, reliability, and the like, so that the switching power supply is widely applied to the fields of computers, communication, electronic instruments, industrial automatic control, national defense, household appliances, and the like, and is converted into electronic equipment through different forms of architectures to provide required voltage or current. However, when the switching power supply is applied to various electronic devices, the driving capability of the switching device is fixed by the control circuit in the switching power supply (for example, the control circuit provides the same driving current for the switching device in different periods), so that the switching device performs state conversion at the same on or off speed for a long time, and EMI is accumulated and generated at the same frequency, so that the EMI in the frequency band exceeds the standard.

The switching device is a three-terminal controllable device which can control the switching-on and the switching-off of the switching device through a driving signal, the three-terminal controllable device comprises a control terminal, a first terminal and a second terminal, and the control terminal controls the switching-on or the switching-off of the first terminal and the second terminal of the control terminal based on the received driving signal. The three-terminal controllable device includes a controllable Transistor, such as a Metal-oxide-semiconductor Field-effect Transistor (MOSFET) or a Bipolar Junction Transistor (BJT), etc.

In view of this, the present application provides a control apparatus and a control method for a switch device, a power driving apparatus, and a chip, which are capable of dispersing electromagnetic interference generated by driving the switch device at the same frequency by changing the on/off switching speed of the switch device at different switching periods (also called switching periods), thereby effectively reducing EMI and solving the aforementioned problems. In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. The following description of the various embodiments of the present application is intended for purposes of illustration only and is not intended to be exhaustive or limited to the embodiments of the application. In addition, the same element numbers may be used for the same, corresponding or similar elements, and are not limited to representing the same elements.

In a possible embodiment, the present application proposes a control device of a switching device for outputting a driving signal for driving the switching device based on a received control signal and a logic signal; wherein the control of the switching timing of the switching device between the first state and the second state by the drive signal is associated with the control signal, and the control of the switching speed of the switching device between the first state and the second state by the drive signal is associated with the logic signal, such that the switching speeds of the switching device between the first state and the second state are different for at least two adjacent switching cycles.

The switching device is switched between a first state and a second state based on the driving of the driving signal, the first state is a state in which the switching device is in an off period, that is, the first end and the second end of the switching device are equivalent to open circuit, and for the switching device is an NPN-type BJT, the first state is that the NPN-type BJT is in an off region; the second state is a state in which the switching device is in an on period, that is, a short circuit is formed between the first end and the second end of the switching device, and current is allowed to pass through the short circuit. The first state may be an on state of the switching device, and the second state may correspond to an off state of the switching device. For convenience of example, the subsequent first state takes an off state of the switching device as an example, and correspondingly, the subsequent second state is an on state of the switching device.

Referring to fig. 1, waveforms of signals and state waveforms of the switching device in an embodiment of the present application are shown, as shown in the figure, a high level in the state waveform of the switching device in the figure is used to indicate that the switching device is in the second state, a low level in the state waveform in the figure is used to indicate that the switching device is in the first state, and a duration of the switching device from the first state to the next first state is a switching period (e.g., T1 in fig. 1).

The control signal is an electrical signal with periodic variation, which determines the switching time and the switching period of the switching device, the switching period of the switching device is equal to the time length of the control signal completing one periodic variation, as shown in fig. 1, and the circuit structure and principle thereof will be detailed later. In the embodiment shown in fig. 1, in order to avoid that the control action of the logic signal only occurs in one switching period of the switching device, the change period of the logic signal is not less than one switching period of the switching device, where the change period of the logic signal refers to a change duration of the logic signal from one state to another state, as shown in fig. 1, T2 in the figure is the change period of the logic signal, and the change period T2 of the logic signal is not less than the switching period T1 of the switching device. It should be noted that the logic signals shown in fig. 1 are only exemplary, and actually, the variation of the logic signals does not necessarily need to have certain regularity and time limitation, and only needs to have variation, for example, the variation period of the logic signals may also be less than one switching period of the switching device.

The driving signal is output by the control device based on the control signal and the logic signal, and as shown in fig. 1, the driving signal may include a voltage signal and a current signal, and the voltage signal is related to the control signal, that is, the voltage signal determines the on-timing and the off-timing of the switching device. Specifically, the voltage signal may have the same or opposite change law as the control signal, and taking the example that the voltage signal shown in fig. 1 has the same change law as the control signal, when the control signal is at a high level, the voltage signal is also at a high level, which is sufficient to drive the switching device to start to enter the second state (i.e., conducting, the process of changing the waveform of the switching device from a low level to a high level in fig. 1), and when the control signal is at a low level, the voltage signal is also at a low level, which is insufficient to maintain the switching device in the second state, so that the switching device starts to enter the first state (i.e., turning off, the process of changing the waveform of the switching device from a high level to a low level in fig. 1).

It should be noted that the voltage signal generated based on the control signal can only determine the switching timing of the switching device, and the switching speed of the switching device is related to the current signal of the driving signal, and the current signal is related to the logic signal. Specifically, as shown in fig. 1, the magnitude of the current signal changes once for every change in the logic signal, so that the switching speed of the switching device changes (the slope of the transition between the first state and the second state of the waveform of the switching device in fig. 1 reflects the switching speed). It should be noted that the current signal includes a switching current (also referred to as a driving current, which is subsequently also denoted as a switching current for switching the switching device from the first state to the second state) for switching the switching device from the first state to the second state, and a switching current (also referred to as a discharging current, which is subsequently also denoted as a switching current for switching the switching device from the second state to the first state) for switching the switching device from the second state to the first state. Wherein the driving current determines a switching speed of the switching device from the first state to the second state, and the discharging current determines a switching speed of the switching device from the second state to the first state. The current signal shown in fig. 1 is only for representing the change relationship between the current signal and the logic signal, and does not distinguish the driving current and the discharging current, and does not represent the real current signal waveform, for example, the driving current and the discharging current are not necessarily the same in magnitude in one switching period, and at least one of the driving current and the discharging current may be changed based on the logic signal, so that the changing switching speed of the switching device is the switching speed of the corresponding current.

In addition, the high level and the low level mentioned above and in the following are relative to the object controlled by the control device, the high level indicates that the object can be in one state, and the low level indicates that the object is in another state. For example, in fig. 1, the controlled object of the voltage signal is the switching device, a high level of the voltage signal refers to a voltage capable of making the switching device in the second state (on), the voltage signal is regarded as a high level as long as the voltage signal is greater than the on voltage of the switching device, a low level of the voltage signal refers to a voltage capable of making the switching device in the first state (off), and the voltage signal is regarded as a low level as long as the voltage signal is capable of making the switching device off, and the voltage is, for example, zero or close to zero.

The detailed description of the proposed control device is continued with reference to fig. 2 to 14. Referring to fig. 2, which is a circuit block diagram of an embodiment of the control apparatus of the present application, as shown in the figure, the control apparatus 10 of the switching device has an output terminal P _101 for outputting a driving signal, and the output terminal P _101 is used to connect with a control terminal (not shown) of the switching device. The control device 10 comprises a main switch module 11 and a speed switching module 12. The main switch module 11 is coupled to a line on which the output terminal P _101 is connected, and configured to perform an on or off operation under the control of the control signal S _ ctr, so as to transmit a power signal generated by a power source to the output terminal P _101 and output the power signal, that is, generate the driving signal S _ dir. The speed switching module 12 is coupled to the main switching module 11, and is configured to change the control of the switching speed of the switching device between the first state and the second state by the driving signal S _ dir under the control of the logic signal S _ log, so that the switching speed of the switching device between the first state and the second state is different for two adjacent switching cycles. It should be noted that the connection relationship between the main switch module 11 and the speed switching module 12 and the position of the output terminal P _101 shown in fig. 2 are only examples for illustration and do not represent a limitation on the connection relationship between the three, for example, the speed switching module 12 in fig. 2 may also be connected between the main switch module 11 and the output terminal P _ 101.

Wherein the control signal S _ ctr and the logic signal S _ log are independent of each other. Further, independent of each other means that the control signal S _ ctr and the logic signal S _ log control the control device 10 according to respective logic rules, wherein the control signal S _ ctr does not affect the control of the logic signal S _ log on the speed switching module 12 when controlling the main switch module 11.

In some embodiments, the control signal S _ ctr may be from a control circuit of an existing switching device, and the control circuit may be, for example, a controller, a control chip, or the like for driving the switching device with a fixed driving capability, and here, the control apparatus 10 of the present application may be coupled between the control circuit of the existing switching device and the switching device. For example, the control circuit includes: a DC-DC power conversion chip, etc., but not limited thereto, in other embodiments, the control signal S _ ctr may be output from the control device 10.

In view of this, referring to fig. 3, which is a circuit block diagram of the control apparatus of the present application in another embodiment, as shown in the figure, the control apparatus 10 further includes a driving control module 13, coupled to the main switch module 11, for detecting an electrical signal flowing through the switch device and outputting the control signal S _ ctr to the main switch module 11 based on the detection result, based on the circuit structure shown in fig. 2. In one example, the driving control module 13 includes a peak current detection unit that obtains an electrical signal reflecting a current flowing through the switching device and compares the obtained electrical signal with a reference signal to output a comparison result, and a logic controller coupled to the peak current detection unit to output a control signal S _ ctr based on the comparison result. In another example, the driving control module 13 includes an on detection unit for detecting an electrical signal reflecting a load power supply of the switching device, an off detection unit for selecting a time limit threshold of a corresponding load according to a voltage of the detected electrical signal, timing according to the selected time limit threshold, and outputting a first indication signal to the logic controller when the timing is over, and a logic controller for acquiring an electrical signal reflecting a current flowing through the switching device, and outputting a second indication signal to the logic controller when it is determined that the current flowing through the switching device is a peak current according to the acquired electrical signal, and the logic controller outputs a control signal to the main switching module 11 based on the first indication signal and the second indication signal. In other examples, the driving control module 13 may also be formed by a partial circuit in an existing control circuit of the switching device, and the partial circuit may be capable of determining the on or off timing of the switching device.

Referring to fig. 4, which is a circuit block diagram of a main switch module in an embodiment of the present disclosure, as shown in the figure, the main switch module 11 includes a first main switch unit 110 and a second main switch unit 111, and as shown in the figure, the first main switch unit 110 is connected in series to a line between an output terminal P _101 and a power supply Vcc, and is configured to provide a driving power to a switch device through the output terminal P _101 when the switching device is controlled to be turned on by a control signal S _ ctr, so that the switch device is switched from a first state (off) to a second state (on) when the first main switch unit 110 is turned on. The second main switching unit 111 is connected in series to a line between the output terminal P _101 and a reference low potential (e.g., a power ground GND or a reference ground SGND, which is shown as the power ground GND) for providing a discharge path for the switching device when being controlled to be turned on by the control signal S _ ctr, so that the switching device is switched from the second state (on) to the first state (off) when the second main switching unit 111 is turned on. The control signal S _ ctr has opposite control effects on the first main switch unit 110 and the second main switch unit 111, that is, when the first main switch unit 110 is controlled by the control signal S _ ctr to be turned on, the second main switch unit 111 is controlled to be turned off, and when the first main switch unit 110 is controlled by the control signal S _ ctr to be turned off, the second main switch unit 111 is controlled to be turned on. For example, referring to fig. 5, which is a schematic circuit structure diagram of the main switch module in an embodiment of the present invention, the first main switch unit 110 includes a main control switch Son0, the second main switch unit 111 includes a main control switch Soff0, and the main control switch Son0 and the main control switch Soff0 can be implemented by using controllable transistors. Further, the opposite control of the control signal S _ ctr can be achieved by providing different types of controllable transistors for the first main switch unit 110 and the second main switch unit 111, for example, the main switch Son0 uses NPN type MOSFET, and the main switch Soff0 uses PNP type MOSFET. The control function of the control signal S _ ctr can also be achieved by providing an inverter at the control end of the first main switch unit 110 or the second main switch unit 111, which is not limited in the present application.

It should be noted that, the connection manner of the first main switch unit 110 and the second main switch unit 111 in fig. 4 and fig. 5 is for convenience of illustration, and is shown as a line where the two main switch units (110, 111) are located, and does not indicate that the first main switch unit 110, the second main switch unit 111, and the output end P _101 are necessarily directly connected. The circuit structures of the first main switch power supply 110 and the second main switch unit 111 are not limited in fig. 5, and in other embodiments, the first main switch power supply 110 and the second main switch unit 111 may also be a circuit constructed by at least one element of a resistor, a current source, and a voltage source and a main control switch in a circuit connection manner.

As described above, the driving signal S _ dir may include a voltage signal and a current signal. The voltage signal determines the on-time and the off-time of the switching device, and the magnitude of the current signal determines the switching speed of the switching device. As can be seen from the embodiments shown in fig. 4 and 5, the control signal S _ ctr controls the first main switch unit 110 to be turned on or off determines whether to provide a power supply line for the switching device, that is, the voltage signal is associated with the control signal S _ ctr, when the control signal controls the first main switch unit 110 to be turned on, the power supply Vcc provides a voltage signal sufficient to drive the switching device to be turned on, and when the control signal controls the first main switch unit to be turned off, the power supply line of the switching device is turned off, and the voltage signal is zero or close to zero and insufficient to maintain the switching device to be turned on, so as to start to be turned off. At this time, the driving signal S _ dir (i.e., the voltage signal) outputted based on the control signal S _ ctr can only determine the on or off timing of the switching device, and the switching speed of the switching device is related to the current signal.

In view of this, in some embodiments, the speed switching module 12 varies the current signal based on a change in the logic signal S _ log to cause a change in switching speed of the switching device between a first state and a second state. As mentioned above, the current signal includes a driving current and a discharging current, so the speed switching module 12 can change at least one of the driving current and the discharging current based on the change of the logic signal S _ log, thereby achieving the purpose of changing the switching speed of the switching device. Specifically, the speed switching module 12 may change the driving current to change the switching speed of the switching device from the first state to the second state, change the discharging current to change the switching speed of the switching device from the second state to the first state, and change the driving current and the discharging current to change the switching speed of the switching device from the first state to the second state and from the second state to the first state.

In an embodiment, the speed switching module 12 includes an on-speed switching unit, configured to change a switching speed of the driving signal to control the switching device to switch from the first state to the second state based on the logic signal, that is, to change the driving current. Furthermore, the conduction speed switching unit changes the driving current by changing the internal resistance value or the internal current change of the control device. Referring to fig. 6 and 7, fig. 6 is a circuit structure diagram of an on-speed switching unit in one example of the present application, fig. 7 is a circuit structure diagram of an on-speed switching unit in another example of the present application, and as shown in fig. 6 and 7, the on-speed switching unit 120 has a first access terminal P _120 and a second access terminal P _121, and is coupled to the first main switch unit 110 through two access terminals (P _120, P _ 121). Further, referring to fig. 4 or 5, the conduction speed switching unit 120 may be connected to the power supply Vcc through the first connection terminal P _120, and the second connection terminal P _121 is connected to the output terminal P _101 to be connected in parallel with the first main switch unit 110. The on-speed switching unit 120 may be further connected between the first main switching unit 110 and the output terminal P _101, or between the first main switching unit 110 and the power supply Vcc, via a first access terminal P _120 and a second access terminal P _121, so as to be connected in series with the first main switching unit 110. The conduction speed switching unit 120 includes at least one group of first switch circuits 121, each group of first switch circuits 121 are connected in parallel with each other, one end of each group of first switch circuits 121 is connected to the first access terminal P _120, and the other end is connected to the second access terminal P _121, and is configured to selectively conduct in time sequence based on the logic signal S _ log to change a switching speed at which the switch device is switched from the first state to the second state.

In an example, the at least one set of first switch circuits 121 adjusts the driving current of the driving signal to change the switching speed of the switching device from the first state to the second state by changing the internal resistance of the control device, as shown in fig. 6, the first switch circuit 121 includes a first switch transistor Son and a first resistive circuit Ron, the first switch transistor Son is a three-terminal controllable device, a first terminal of the first switch transistor Son is connected to one terminal of the first resistive circuit Ron, a second terminal of the first switch transistor Son is connected to the second access terminal P _121, and receives the logic signal S _ log through a control terminal thereof to control the connection or disconnection between the first terminal and the second terminal thereof. The other end of the first resistive circuit Ron is connected to the first access terminal P _120, and is configured to change the driving current by using a preset impedance. The first switch transistor Son may be implemented by a controllable transistor, such as a MOSFET or a BJT, the first resistive circuit Ron may be implemented by a single resistor, or may be equivalently implemented by a plurality of resistors, and the preset impedances of the first resistive circuits Ron of each group may be the same or different.

In another example, the at least one set of first switch circuits 121 adjusts the driving current of the driving signal to change the switching speed of the switch device from the first state to the second state by changing the internal current of the control device, as shown in fig. 7, the first switch circuit 121 includes a first switch transistor Son and a first current source Ion, the first switch transistor Son is a three-terminal controllable device, a first terminal of the first switch transistor Son is connected to one terminal of the first current source Ion, a second terminal of the first switch transistor Son is connected to the second access terminal P _121, and receives the logic signal S _ log through a control terminal thereof to control the connection or disconnection between the first terminal and the second terminal thereof. The other end of the first current source Ion is connected to the first access terminal P _120, and is configured to change a driving current of the driving signal by using a preset current thereof. The first switch transistor Son may be implemented by using a controllable transistor, such as a MOSFET or a BJT.

In the above examples, when the first switching circuits 121 of each group are connected in parallel to the first main switching unit, the number of the first switching circuits is at least one. When each group of the first switch circuits 121 is connected in series with the first main switch unit, the number of the first switch circuits is at least two, and those skilled in the art can set the number of the groups of the first switch circuits according to the requirement, which is not limited in the present application.

How the first switching circuit changes the switching speed of the switching device from the first state to the second state based on the logic signal S _ log is described below by taking four sets of the first switching circuits 121 as examples in conjunction with fig. 6 to 8. The first switching tubes Son included in the four groups of first switching circuits 121 are respectively denoted as Son _1, Son _2, Son _3, and Son _4, the first resistive circuits Ron are respectively denoted as Ron _1, Ron _2, Ron _3, and Ron _4, and the first current sources Ion are respectively denoted as Ion _1, Ion _2, Ion _3, and Ion _ 4.

The logic signal S _ log is used to control the on/off of the first switch transistors Son of each group of the first switch circuits 121, and may be, for example, a multi-output electrical signal that varies according to a time sequence, where each output corresponds to the first switch transistor Son of each group of the first switch circuits 121. Taking the example of four sets of the first switch circuits 121, the logic signal S _ log is a time-varying electrical signal outputted by four paths, and please refer to fig. 8, which shows a waveform diagram of the logic signal in an embodiment of the present invention, as shown in the figure, the CP signal is a clock signal, which is used as a clock for the logic signal S _ log to make the logic signal S _ log vary time-sequentially by one clock period T3, so that the duration T2 of the logic signal S _ log in fig. 8 from one state (e.g. the state "1011" of the first clock period T3 in fig. 8) to another state (e.g. the state "0110" of the second clock period T3 in fig. 8) is two clock periods. Four paths of the logic signal S _ log respectively control the first switch transistor Son _1 of the first switch circuit 121, the first switch transistor Son _2 of the second switch circuit 121, the first switch transistor Son _3 of the third switch circuit 121, and the first switch transistor Son _4 of the fourth switch circuit 121. Details regarding the generation and composition of the logic signal S _ log will be described later. It should be noted that, in order to avoid the control effect of the logic signal S _ log on the switching control module 12 only occurring in one switching cycle (e.g., T1 in fig. 8) of the switching device, the variation cycle of the logic signal S _ log (i.e., T2 in fig. 8) is not less than one switching cycle of the switching device, so that the switching device has a different switching speed between the first state and the second state in adjacent switching cycles. It should be noted that the logic signals shown in fig. 8 are only exemplary, and actually, the variation of the logic signals does not necessarily need to have certain rules and time limits, and only needs to have variations, for example, the variation period of the logic signals may also be less than one switching period of the switching device.

Taking the conduction speed switching unit 120 shown in fig. 6 or fig. 7 and the first main switching unit 110 shown in fig. 5 connected in series as an example, in the first clock period of the logic signal S _ log, the first switching tubes Son _1, Son _3, and Son _4 are turned on, during which the first main switching unit 110 is turned on, the conduction speed switching unit 120 shown in fig. 6 provides approximately the same driving current for the switching devices

Where Ron _1// Ron _3// Ron _4 is represented as the parallel equivalent impedance of Ron _1, Ron _3, Ron _4, or the on-speed switching unit 120 shown in fig. 7 provides a driving current for the switching device that is approximately the sum of the preset currents of the first current sources Ion _1, Ion _3, and Ion _4, so that the switching device switches from the first state to the second state at the speed Von _1 in the first clock pulse period (in the first waveform of the switching device shown in fig. 8, the switching device switches from the low level to the high level at the first clock pulse period, and the slope thereof reflects the switching speed Von _ 1); during the second clock period of the logic signal S _ log, the first switch transistors Son _2 and Son _3 are turned on, and during this period, when the first main switch unit 110 is turned on, the conduction speed switching unit 120 shown in fig. 6 provides approximately the same driving current for the switch devices

Where Ron _2// Ron _3 is expressed as the parallel equivalent impedance of both Ron _2 and Ron _3, or the on-speed switching unit 120 shown in fig. 7 provides the driving current for the switching device to be approximately the sum of the preset currents of the first current sources Ion _2 and Ion _3, so that the switching device is switched from the first state to the second state at the speed Von _2 in the second clock pulse period (in the first waveform diagram of the switching device as shown in fig. 8, the switching device is switched from the low level to the high level in the second clock pulse period, and the slope thereof reflects the switching speed Von _ 2); in the third clock period of the logic signal S _ log, the first switch transistor Son _2 is turned on, and during this period, when the first main switch unit 110 is turned on, the on-speed switch unit 120 shown in fig. 6 provides a driving current for the switch device approximately equal to

Or the driving current provided by the on-speed switching unit 120 shown in fig. 7 to the switching device is approximately the preset current of the first current source Ion _2, so that the switching device is switched from the first state to the second state at the speed Von _3 in the third clock pulse period (in the first waveform diagram of the switching device shown in fig. 8, the switching device is switched from the low level to the high level in the third clock pulse period, and the slope thereof reflects the switching speed Von _ 3); in the fourth clock period of the logic signal S _ log, the first switch transistors Son _2 and Son _3 are turned on, and during this period, when the first main switch unit 110 is turned on, the on-speed switch unit 120 shown in fig. 6 provides approximately the same driving current for the switch devices

Where Ron _2// Ron _3 is expressed as the parallel equivalent impedance of both Ron _2 and Ron _3, or the on-speed switching unit 120 shown in fig. 7 provides the driving current for the switching device approximately as the sum of the preset currents of the first current sources Ion _2 and Ion _3, so that the switching device is switched from the first state to the second state at the speed Von _4 in the fourth clock period (in the first waveform diagram of the switching device as in fig. 8, the switching device is switched in the fourth clock periodSwitching from low to high, the slope of which reflects the switching speed Von _ 4). As can be seen from the above, at least one of the four sets of first switch circuits 121 turned on in two adjacent clock periods is different, so that the equivalent impedances formed by the on-speed switching units 120 are different, or the total preset currents formed are different, so that different driving currents are provided for the switch devices in two adjacent clock periods, and the switch devices have different switching speeds from the first state to the second state. It should be noted that, the above description does not consider the case that the first main switch unit 110 has a resistor or a current source, and when the first main switch unit 110 includes a resistor or a current source, the preset impedance or the preset current of the first main switch unit 110 needs to be considered in the calculation of the driving current, and the principle is similar to the above, and the intended function of the present application is not affected.

When the conduction speed switching unit 120 shown in fig. 6 or fig. 7 is connected in parallel with the first main switching unit 110, the process of the first switching circuit changing the switching speed of the switching device from the first state to the second state based on the logic signal S _ log is similar to the above-mentioned serial connection manner, and is not repeated here.

It should be noted that, in the above-mentioned serial connection manner, in order to avoid the situation that the first switch transistor Son is completely turned off during the time when the first main switch unit 110 is turned on, the multiple paths of the logic signal S _ log cannot be simultaneously zero. In addition, the waveform of the logic signal S _ log and the control manner of the on-speed switching unit 120 shown in fig. 8 are only examples, the waveform change of the logic signal S _ log is not necessarily in a unit of one clock pulse period, and is not required to have regularity, and the logic signal S _ log only needs to have a change, so that the on-speed switching unit 120 can control based on the logic signal S _ log to have different driving currents output to the switching devices in the change period of the logic signal. For example, when the preset impedances of the first resistive circuits Ron of the first switch circuits 121 in each group or the preset currents of the first current sources Ion are different from each other, the logic signal S _ log only needs to control the turned-on first switch circuits 121 to be different groups in two adjacent states. For another example, when the preset impedance of the first resistive circuit Ron of each group of the first switch circuits 121 or the preset current of the first current source Ion are the same, the logic signal S _ log only needs to control the number of the turned-on first switch circuits 121 to be different in two adjacent states.

In another embodiment, the speed switching module 12 includes an off-speed switching unit for changing a switching speed of the driving signal for controlling the switching device to switch from the second state to the first state based on the logic signal, i.e. changing the discharge current. Furthermore, the turn-off speed switching unit changes the discharge current by changing the internal resistance value or the internal current change of the control device. Referring to fig. 9 and 10, fig. 9 is a circuit structure diagram of a turn-off speed switching unit in an example of the present application, and fig. 10 is a circuit structure diagram of a turn-off speed switching unit in another example of the present application, as shown in fig. 9 and 10, the turn-off speed switching unit 122 has a third access terminal P _122 and a fourth access terminal P _123, and is coupled to the second main switching unit 111 through two access terminals (P _122, P _ 123). Further, in conjunction with fig. 4 or fig. 5, the turn-off speed switching unit 122 in the present embodiment can be connected to the output terminal P _101 through the third access terminal P _122, and the fourth access terminal P _123 is connected to the reference low level (such as the power ground GND or the ground SGND, which is shown as the power ground GND in fig. 4 and fig. 5) to be connected in parallel with the second main switching unit 111. The turn-off speed switching unit 122 may be further connected between the second main switching unit 111 and the reference low potential or between the second main switching unit 111 and the output terminal P _101 by a third access terminal P _122 and a fourth access terminal P _123 to be connected in series with the second main switching unit 111. As shown in fig. 9 and 10, the turn-off speed switching unit 122 includes at least one set of second switching circuits 123, the sets of second switching circuits 123 are connected in parallel with each other, one end of each set of second switching circuits 123 is connected to the third incoming terminal P _122, and the other end is connected to the fourth incoming terminal P _123, and is configured to selectively turn on in time sequence based on the logic signal S _ log to change the switching speed at which the switching device is switched from the second state to the first state.

In an example, the at least one second switch circuit adjusts the discharge current of the driving signal to change the switching speed of the switch device from the second state to the first state by changing the internal resistance of the control device, as shown in fig. 9, the second switch circuit 123 includes a second switch tube Soff and a second resistive circuit Roff, the second switch tube Soff is a three-terminal controllable device, a first terminal of the second switch tube Soff is connected to one terminal of the second resistive circuit Roff, a second terminal of the second switch tube Soff is connected to the fourth access terminal P _123, and receives the logic signal S _ log through a control terminal thereof to control the connection or disconnection between the first terminal and the second terminal thereof. The other end of the second resistive circuit Roff is connected to the third input terminal P _122, and is configured to change the discharge current by using a preset impedance. The second switch tube Soff may be implemented by a controllable transistor, such as a MOSFET or a BJT, the second resistive circuit Roff may be implemented by a single resistor, or may be equivalently implemented by a plurality of resistors, and the preset impedances of the second resistive circuits Roff may be the same or different.

In another example, the at least one set of first switching circuits adjusts the discharging current of the driving signal to change the switching speed of the switching device from the second state to the first state by changing the internal current of the control device, as shown in fig. 10, each set of second switching circuits 123 includes a second switching tube Soff and a second current source Ioff, the second switching tube Soff is a three-terminal controllable device, a first terminal of the second switching tube Soff is connected to one terminal of the second current source Ioff, a second terminal of the second switching tube Soff is connected to the fourth access terminal P _123, and receives the logic signal S _ log through a control terminal thereof to control the connection or disconnection between the first terminal and the second terminal thereof. The other end of the second current source Ioff is connected to the third switch-in terminal P _122 for changing the discharging current by using a preset current thereof. The second switch tube Soff can be implemented by using a controllable transistor, such as a MOSFET or a BJT.

It should be noted that, when the sets of second switch circuits 123 in the above examples are connected in parallel to the second main switch unit 111, the number of the sets of second switch circuits 123 is at least one. When each group of the second switch circuits 123 is connected in series with the second main switch unit 111, the number of the plurality of groups of the second switch circuits 123 is at least two, and those skilled in the art can set the number of the plurality of groups of the first switch circuits according to the requirement, which is not limited in the present application.

The following describes how the four sets of second switching circuits 123 implement changing the switching speed of the switching device from the second state to the first state based on the logic signal S _ log in conjunction with fig. 8 to 10. The second switching tubes Soff included in the four sets of second switching circuits 123 are respectively denoted as Soff _1, Soff _2, Soff _3, and Soff _4, the second resistive circuits Roff are respectively denoted as Roff _1, Roff _2, Roff _3, and Roff _4, and the second current sources Ioff are respectively denoted as Ioff _1, Ioff _2, Ioff _3, and Ioff _ 4.

The logic signal S _ log is used to control the on/off of the second switch tubes Soff of each group of the second switch circuits 123, and may be, for example, a multi-output electrical signal varying with time sequence, and each output corresponds to the second switch tube Soff of each group of the second switch circuits 123. The following description will be given taking as an example that the logic signal S _ log shown in fig. 8 is output by four paths and corresponds to the control of the second switching tubes (Soff _1, Soff _2, Soff _3, and Soff _ 4). The relationship between the logic signal S _ log and the switching period is shown in the foregoing description with respect to fig. 8, and is not described herein again.

Taking the example of the turn-off speed switching unit 122 shown in fig. 9 or fig. 10 connected in series with the second main switching unit 111 shown in fig. 5, in conjunction with fig. 8, during the first clock period of the logic signal S _ log, the second switching tubes Soff _1, Soff _3, and Soff _4 are turned on, and during this period, when the second main switching unit 111 is turned on, the turn-off speed switching unit 122 shown in fig. 9 provides the discharging current for the switching device determined by the parallel equivalent impedances of the second resistive circuits (Roff _1, Roff _3, Roff _4), the larger the equivalent impedance is, the slower the discharging current is, or the discharging current provided by the turn-off speed switching unit 122 shown in fig. 10 for the switching device is approximately the sum of the preset currents of the second current sources Ioff _1, Ioff _3, and Ioff _4, so that the switching device is switched from the second state to the first state at the speed Voff _1 in the first clock period (the second clock period shown in fig. 8 is a waveform of the second main switching device The switching device is switched from high level to low level in the first clock pulse period, and the slope of the switching device reflects the switching speed Voff _ 1); during the second clock period of the logic signal S _ log, the second switch tubes Soff _2 and Soff _3 are turned on, and during this period, when the second main switch unit 111 is turned on, the off-speed switch unit 122 shown in fig. 9 provides the switch device with the discharge current determined by the parallel equivalent impedance of both Roff _2 and Roff _3, or the off-speed switch unit 122 shown in fig. 10 provides the switch device with the discharge current approximately equal to the sum of the preset currents of the second current sources Ioff _2 and Ioff _3, so that the switch device is switched from the second state to the first state at the speed Voff _2 during the second clock period (in the second waveform diagram of the switch device shown in fig. 8, the switch device is switched from the high level to the low level during the second clock period, and the slope thereof reflects the switching speed Voff _ 2); during the third clock period of the logic signal S _ log, the second switch tube Soff _2 is turned on, and during this period, when the second main switch unit 111 is turned on, the discharging current provided by the off-speed switch unit 122 shown in fig. 9 for the switch device is determined by the preset impedance of Roff _2, or the discharging current provided by the off-speed switch unit 122 shown in fig. 10 for the switch device is approximate to the preset current of the second current source Ioff _2, so that the switch device is switched from the second state to the first state at the speed Voff _3 in the third clock period (in the second waveform diagram of the switch device shown in fig. 8, the switch device is switched from the high level to the low level at the third clock period, and the slope thereof reflects the switching speed Voff _ 3); during the fourth clock period of the logic signal S _ log, the second switch tubes Soff _2 and Soff _3 are turned on, and during this period, when the second main switch unit 111 is turned on, the off-speed switch unit 122 shown in fig. 9 provides the switch device with the discharge current determined by the parallel equivalent impedance of both Roff _2 and Roff _3, or the off-speed switch unit 122 shown in fig. 10 provides the switch device with the discharge current approximately equal to the sum of the preset currents of the second current sources Ioff _2 and Ioff _3, so that the switch device is switched from the second state to the first state at the speed Voff _4 during the fourth clock period (in the second waveform diagram of the switch device shown in fig. 8, the switch device is switched from the high level to the low level during the fourth clock period, and the slope thereof reflects the switching speed Voff _ 4). As can be seen from the above, the equivalent impedances formed by the turn-off speed switching unit 122 are different or the total preset currents formed by the turn-on second switching circuits 123 are different in two adjacent clock periods, so that different discharging currents are provided for the switching device in two adjacent clock periods, and the switching device further has different switching speeds from the second state to the first state. It should be noted that, the above description does not consider the case that the second main switch unit 111 has a resistor or a current source, and when the second main switch unit 111 includes a resistor or a current source, the preset impedance or the preset current of the second main switch unit 111 needs to be considered in the calculation of the driving current, and the principle is similar to the above description, and the intended function of the present application is not affected.

When the turn-off speed switching unit 122 shown in fig. 9 or fig. 10 is connected in parallel with the second main switching unit 111, the process of the second switching circuit, which changes the switching speed of the switching device from the second state to the first state based on the logic signal S _ log, is similar to the above-mentioned serial connection manner, and is not repeated here.

It should be noted that, in the above-mentioned serial connection manner, in order to avoid the situation that the second switch tube Soff is completely turned off and cannot provide a discharge path during the time when the second main switch unit 111 is turned on, multiple paths of the logic signal S _ log cannot be simultaneously zero. In addition, the waveform of the logic signal S _ log shown in fig. 8 and the control manner of the turn-off speed switching unit 122 shown in fig. 9 and 10 are merely examples, the waveform change of the logic signal S _ log is not necessarily in a unit of one clock pulse period, and is not required to have regularity, and the logic signal S _ log only needs to have a change, so that the turn-off speed switching unit 122 can control based on the logic signal S _ log to make the discharge current output to the switching device in the change period of the logic signal different. For example, when the preset impedance of the second resistive circuit Roff or the preset current of the second current source Ioff of each group of the second switch circuits 123 is different from each other, the logic signal S _ log only needs to control the turned-on second switch circuits 123 to be different groups in two adjacent states. For another example, when the preset impedance of the second resistive circuit Roff or the preset current of the second current source Ioff of each group of the second switch circuits 123 is the same, the logic signal S _ log only needs to control the number of the turned-on second switch circuits 123 to be different in two adjacent states.

In another embodiment, please refer to fig. 11, which is a circuit block diagram of a speed switching module according to an embodiment of the present application, and as shown in the figure, the speed switching module 12 includes an on-speed switching unit 120 and an off-speed switching unit 122. The on-speed switching unit 120 is configured to change a switching speed at which the driving signal controls the switching device to switch from the first state to the second state based on the logic signal S _ log, and a circuit structure and a working principle of the on-speed switching unit 120 refer to the description of fig. 6 and fig. 7, which are not described herein again. The turn-off speed switching unit 122 is configured to change a switching speed at which the driving signal controls the switching device to switch from the second state to the first state based on the logic signal S _ log, and a circuit structure and a working principle of the turn-off speed switching unit 122 refer to the description of fig. 9 and fig. 10, which are not described herein again. Thus, in this embodiment, the speed switching module 12 changes the switching speed of the switching device including the switching speed at which the switching device switches from the second state to the first state and the switching speed at which the switching device switches from the first state to the second state.

The circuit architectures of the on-speed switching unit and the off-speed switching unit described in the above embodiments are only examples, and in other embodiments, the on-speed switching unit and the off-speed switching unit may be implemented by using an adjustable resistor, and the adjustable resistor changes its impedance based on a logic signal, or the on-speed switching unit and the off-speed switching unit may also be built by using a switching tube and a resistor or a current source or a voltage source, and it is only necessary to change its impedance or output current based on a logic signal, and the present application is not limited.

Wherein the logic signals may be provided by a separate logic control module or by other signal processing means associated with other circuit modules in the control apparatus. For this purpose, the logic control module may be disposed outside the control device 10 of the present application, or may be disposed inside the control device 10.

In view of this, referring to fig. 12, which is a circuit block diagram of the control apparatus of the present application in another embodiment, as shown in the figure, the control apparatus 10 further includes a logic control module 14 based on the circuit structure shown in fig. 1, where the logic control module 14 has an output terminal P _140, and is coupled to the speed switching module 12 through the output terminal P _140 for generating a logic signal S _ log that varies according to a time sequence so that the speed switching module 12 can act according to the logic signal S _ log to affect a switching speed of the switching device. It should be noted that fig. 12 is a block diagram of a circuit structure including a logic control module, and in practical applications, the control device 10 may further include a logic control module coupled to the speed switching module 12 based on the circuit structure shown in fig. 3, which is not shown here.

Referring to fig. 13, a circuit block diagram of a logic control module according to an embodiment of the present application is shown, and as shown in the figure, in an embodiment, the logic control module 14 includes a clock generating circuit 140 and a first logic circuit 141. The clock generating circuit 140 is configured to output a clock pulse signal CP, and the first logic circuit 141 is connected to the clock generating circuit 140 and the output terminal P _140, so as to output a first logic signal through the output terminal P _140 based on the clock pulse signal CP. The clock pulse signal CP is used as a clock of a first logic signal, so that the first logic signal varies in time sequence by one clock pulse period, and the first logic signal represents the logic signal S _ log (for example, as shown in fig. 8). In other words, when the speed switching module includes the on speed switching unit or the off speed switching unit, the first logic signal changes according to a time sequence, so that the switching speed of the switching device is changed from the first state to the second state (for example, a first waveform of the switching device in fig. 8) or from the second state to the first state (for example, a second waveform of the switching device in fig. 8), and when the speed switching module includes both the on speed switching unit and the off speed switching unit, the switching speed of the switching device is changed from the first state to the second state and from the second state to the first state when the first logic signal changes according to the time sequence.

In practical applications, when the speed switching module includes both the on-speed switching unit and the off-speed switching unit, the on-speed switching unit and the off-speed switching unit may not change the switching speed based on the same logic signal. In view of this, please refer to fig. 14, which is a circuit block diagram of a logic control module according to another embodiment of the present application, as shown in the figure, in this embodiment, the logic control module further includes a second logic circuit 142 based on the structure of fig. 11, in this case, the output terminal of the logic control module 14 includes a first output terminal P _141 and a second output terminal P _ 142. The first logic circuit 141 is connected to the clock generating circuit 140 and the first output terminal P _141, so as to output a first logic signal through the first output terminal P _141 based on the clock pulse signal CP. The second logic circuit 142 is connected to the clock generating circuit 140 and the second output terminal P _142 to output a second logic signal through the second output terminal P _142 based on the clock pulse signal CP. The first and second logic signals represent logic signals in yet another embodiment of the aforementioned speed switching module.

In the embodiment shown in fig. 14, the clock pulse signal CP may include a first clock pulse signal, which is used as a clock for the first logic signal and the second logic signal, so that the first logic signal and the second logic signal both change in time sequence by taking one clock pulse period of the first clock pulse signal as a unit. The clock pulse signal CP may also include a first clock pulse signal and a second clock pulse signal, the first clock pulse signal being a clock of the first logic signal so that the first logic signal varies in time sequence in units of one clock pulse period of the first clock pulse signal, the second clock pulse signal being a clock of the second logic signal so that the second logic signal varies in time sequence in units of one clock pulse period of the second clock pulse signal. In other words, the first logic signal and the second logic signal change according to their respective clocks, and the change timings of the two logic signals are not necessarily related to each other, that is, the switching period in which the switching speed of the switching device from the first state to the second state starts to change is not necessarily related to the switching period in which the switching speed of the switching device from the second state to the first state starts to change.

In practical applications, the clock generation circuit in each of the above embodiments may be, for example, a pulse generator, a clock generator, or a clock circuit built by a flip-flop, a timer, and the like, and the first logic circuit and the second logic circuit are obtained according to one or more combinations of control logic including, but not limited to, a flip-flop, a register, a timer, a selector, an and gate, an or gate, a nor gate, and the like, which is not limited in this application.

In summary, the control apparatus for a switching device provided in the present application changes the on/off switching speed of the switching device in different switching periods, so that the switching speeds of the switching devices in at least two adjacent switching periods are different, thereby dispersing the electromagnetic interference generated by driving the switching device at the same frequency, and effectively reducing the EMI.

The application also discloses a control chip, the control chip is packaged with the control device of the switching device according to any one of the above embodiments. The control chip further comprises a plurality of pins, in an embodiment, the chip is packaged with the main switch module and the speed switching module as described above, and the plurality of pins comprise a first pin for acquiring a control signal, a second pin for acquiring a logic signal, a third pin for outputting a driving signal, a fourth pin for acquiring power supply of the chip, and a fifth pin for grounding. In another embodiment, the chip is packaged with the main switch module, the speed switching module, and the driving control module as described above, and the plurality of pins includes a first pin for obtaining an electrical signal reflecting a current flowing through the switch device, a second pin for obtaining a logic signal, a third pin for outputting a driving signal, a fourth pin for obtaining a power supply of the chip, and a fifth pin for grounding. In yet another embodiment, the chip is packaged with the main switch module, the speed switching module, and the logic control module as described above, and the plurality of pins includes a first pin for acquiring a control signal, a second pin for outputting a driving signal, a third pin for acquiring power supply of the chip, and a fourth pin for grounding. In yet another embodiment, the chip is packaged with the main switch module, the speed switching module, the driving control module, and the logic control module as described above, and the plurality of pins includes a first pin for obtaining an electrical signal reflecting a current flowing through the switching device, a second pin for outputting a driving signal, a third pin for obtaining a power supply of the chip, and a fourth pin for grounding. The modules and circuits in the embodiments refer to the foregoing description of fig. 1 to 14, which are not repeated herein.

Referring to fig. 15, a circuit block diagram of the switching power supply apparatus of the present application in one embodiment is shown, and as shown in the figure, the switching unit apparatus 20 includes a rectifying circuit 21, a control apparatus 22, a switching device 23, and an energy conversion circuit 24.

The rectifying circuit 21 is configured to receive an external driving signal to output a rectified signal. The external driving signal may be, for example, an ac signal output by a utility grid, or may be a dc signal. The rectifier circuit 21 may be a full-wave rectifier circuit or a half-wave rectifier circuit including electronic components such as diodes for rectifying the received external drive signal and outputting a rectified signal.

The control device 22 is configured to output a driving signal, and the control device 22 may adopt the control device of the switching device disclosed in the present application, and the structure and the operation principle thereof please refer to the description of fig. 1 to 14, which is not described herein again.

The control terminal of the switching device 23 is coupled to the control means 22 for switching between a first state and a second state based on the drive signal, and the switching speed between the first state and the second state is different in at least two adjacent switching cycles. In an embodiment, the switching device is a three-terminal controllable device that can be controlled to be turned on and off by a control signal, and the three-terminal controllable device includes a control terminal, a first terminal, and a second terminal, and the control terminal controls the connection or disconnection between the first terminal and the second terminal based on the received control signal. The three-terminal controllable device includes a controllable Transistor, such as a Metal-oxide-semiconductor Field-effect Transistor (MOSFET) or a Bipolar Junction Transistor (BJT).

The energy conversion circuit 24 is coupled between the rectifying circuit 21 and the switching device 23, and is configured to perform energy conversion on the received signal based on the first state or the second state of the switching device 23 to stably supply power to the load output. In an embodiment, the energy conversion circuit may be, for example, a circuit constructed by an inductor, a freewheeling diode, and a capacitor, so as to match the state of the switching device to repeatedly excite or demagnetize the inductor, thereby providing stable power supply to the load. The energy conversion circuit can also be realized by matching a transformer with an inductor, a freewheeling diode or a capacitor, which is not limited in the application.

Referring to fig. 16, which is a circuit block diagram of a switching power supply device according to another embodiment of the present application, as shown in fig. 15, based on the structure of the switching power supply device, the switching power supply device further includes a filter circuit 25, where the filter circuit 25 is coupled to a line between the rectifier circuit 21 and the energy conversion circuit 24, and is configured to filter a rectified signal output by the rectifier circuit to output a filtered signal to the energy conversion circuit 24. In an embodiment, the filter circuit 24 may be a pi filter circuit, an LC filter circuit, an RC filter circuit, an LC pi filter circuit, an RC pi filter circuit, or the like, which is not limited in this application.

The application also discloses a control method of the switching device, and the control method is applied to a control device of the switching device. Referring to fig. 17, which is a flowchart illustrating a control method according to an embodiment of the present application, the control method of the switching device includes steps S10 and S11.

In step S10, the control device obtains a control signal and a logic signal.

Referring to the description of fig. 2, the control device includes a main switch module and a speed switching module, wherein the main switch module obtains the control signal to be controlled by the control signal, and the speed switching module obtains the logic signal to be controlled by the logic signal. It should be noted that the control signal and the logic signal are independent from each other. Further, the mutually independent means that the control signal and the logic signal control the control device according to respective logic rules, wherein the control signal does not influence the control of the logic signal on the speed switching module when controlling the main switch module.

In some embodiments, the control signal S _ ctr may be from an existing control circuit of the switching device, which may be, for example, a controller, a control chip, or the like for driving the switching device with a fixed driving capability.

In some embodiments, the control apparatus further includes a driving control module that detects an electrical signal flowing through the switching device and outputs the control signal to the main switching module based on a detection result. Please refer to the description of fig. 3 for the detailed working process of the circuit structure of the driving control module and the control signal generation, which is not described herein again.

Wherein, the logic signal can be provided by a logic control module. Further, the logic control module may be disposed outside the control device to output the logic signal to the control device, or disposed inside the control device to output the logic signal to the speed switching module. In view of this, in some embodiments, the control device further includes a logic control module for generating the time-varying logic signal. For a detailed process of generating the logic signal and a circuit structure of the logic control module, please refer to the description of fig. 8 and fig. 12 to fig. 14, which are not repeated herein.

In step S11, the control device outputs a drive signal that drives the switching device based on the control signal and the logic signal.

In some embodiments, the main switching module is turned on or off based on the control signal to output the driving signal, and the speed switching module changes a switching speed of the driving signal to the switching device between a first state and a second state based on the logic signal so that the switching speed of the switching device is different between the first state and the second state in which adjacent switching cycles exist. Please refer to the description of fig. 3 to 11 for the circuit structures and the operation principles of the main switch module and the speed switching module, which are not described herein again.

In summary, the control device and the control method for the switching device, the switching power supply device, and the chip provided by the present application change the on-off switching speed of the switching device in different switching cycles, so that the switching speeds of at least two adjacent switching cycles are different, thereby dispersing the electromagnetic interference generated by driving the switching device at the same frequency, and effectively reducing the EMI.

The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the application. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of the present application.

Claims

1. A control apparatus of a switching device, characterized by outputting a driving signal for driving the switching device based on a received control signal and a logic signal; wherein the control of the switching timing of the switching device between the first state and the second state by the drive signal is associated with the control signal, and the control of the switching speed of the switching device between the first state and the second state by the drive signal is associated with the logic signal, such that the switching speeds of the switching device between the first state and the second state are different for at least two adjacent switching cycles; wherein:

the control device includes:

the main switch module is used for performing on-off operation under the control of the control signal so as to generate the driving signal;

the logic control module comprises a clock generating circuit used for outputting a clock pulse signal, and the logic control module is used for outputting the logic signal which changes according to time sequence based on the clock pulse signal;

and the speed switching module is coupled with the main switch module and used for changing the switching speed of the driving signal for driving the switching device to switch between the first state and the second state under the control of the logic signal, so that the switching speed is changed along with the change of the logic signal.

2. The control device of claim 1, wherein the control signal and the logic signal are independent of each other.

3. The control apparatus according to claim 1, wherein a change cycle of the logic signal is not less than one switching cycle of the switching device.

4. The control apparatus of claim 1, wherein the driving signal changes a switching speed of the switching device by an internal resistance value or an internal current change of the control apparatus.

5. The control device of claim 1, wherein the main switch module comprises a first main switch unit and a second main switch unit; when the first main switch unit is controlled by the control signal to be switched on, the second main switch unit is switched off, and when the first main switch unit is controlled by the control signal to be switched off, the second main switch unit is switched on.

6. The control device according to claim 1, wherein the speed switching module includes an on-speed switching unit and/or an off-speed switching unit; the on-speed switching unit is used for changing the switching speed of the driving signal for controlling the switching device to be switched from the first state to the second state based on the logic signal, and the off-speed switching unit is used for changing the switching speed of the driving signal for controlling the switching device to be switched from the second state to the first state based on the logic signal.

7. The control apparatus of claim 6, wherein the conduction speed switching unit comprises at least one set of first switching circuits, and the first switching circuits are selectively turned on in time sequence based on the logic signals to change the switching speed of the driving signals for controlling the switching devices to switch from the first state to the second state.

8. The control device according to claim 7, wherein the first switching circuit includes:

the first switch tube is coupled with the main switch module and is used for being controlled to be switched on or switched off by the logic signal; and, a first resistive circuit or a first current source;

the first resistive circuit is connected in series with the first switching tube; or the first current source is connected in series with the first switch tube.

9. The control device as claimed in claim 6, wherein the turn-off speed switching unit comprises at least one set of second switching circuits for selectively turning on in time sequence based on the logic signal to change the switching speed of the driving signal for controlling the switching device to switch from the second state to the first state.

10. The control device according to claim 9, wherein the second switch circuit includes:

the second switch tube is coupled with the main switch module and is used for being controlled to be switched on or switched off by the logic signal; and, a second resistive circuit or a second current source;

the second resistive circuit is connected in series with the second switching tube; or the second current source is connected with the second switch tube in series.

11. The control apparatus of claim 1, wherein the logic control module further comprises:

the first logic circuit is coupled to the clock generating circuit and configured to output a first logic signal varying in time sequence based on the clock pulse signal, wherein the logic signal is represented by the first logic signal.

12. The control device of claim 11, wherein the logic control module further comprises:

a second logic circuit, coupled to the clock generating circuit, for outputting a second logic signal varying in time sequence based on the clock pulse signal; wherein the logic signal is represented by the first logic signal and the second logic signal, the first logic signal is used for controlling the speed switching module to change the switching speed of the switching device from the first state to the second state, and the second logic signal is used for controlling the speed switching module to change the switching speed of the switching device from the second state to the first state.

13. The control apparatus of claim 1, further comprising a driving control module for detecting an electrical signal flowing through the switching device and outputting the control signal to the main switching module based on a detection result.

14. A control chip, wherein the chip is packaged with a control device according to any one of claims 1 to 13.

15. A switching power supply device characterized by comprising:

a rectifying circuit for receiving an external driving signal to output a rectified signal;

a control apparatus according to any one of claims 1 to 13, for outputting a drive signal;

a switching device, a control end of which is coupled with the control device, and is used for switching between a first state and a second state based on the driving signal, and the switching speed between the first state and the second state is different in at least two adjacent switching cycles;

and the energy conversion circuit is coupled between the rectifying circuit and the switching device and used for performing energy conversion on the received signal based on the first state or the second state of the switching device so as to output stable power to a load.

16. The switching power supply device according to claim 15, further comprising a filter circuit coupled to a line between the rectifying circuit and the energy conversion circuit for filtering the rectified signal output from the rectifying circuit to output a filtered signal to the energy conversion circuit.

17. A method of controlling a switching device, comprising the steps of:

acquiring a control signal and a logic signal; the logic signal is a signal which is output based on a clock pulse signal output by a clock generating circuit and changes according to time sequence;

outputting a driving signal for driving the switching device based on the control signal and the logic signal; wherein the control of the switching timing of the switching device between the first state and the second state by the drive signal is associated with the control signal, and the control of the switching speed of the switching device between the first state and the second state by the drive signal is associated with the logic signal, such that the switching speeds of the switching device between the first state and the second state are different for at least two adjacent switching cycles;

wherein outputting a drive signal to drive the switching device based on the control signal and a logic signal comprises:

switching on or off a main switch module based on the control signal to generate the driving signal;

changing a switching speed of the driving signal to the switching device between a first state and a second state based on the logic signal such that the switching speed varies with a variation of the logic signal.

18. The control method of claim 17, wherein the control signal and the logic signal are independent of each other.

19. The control method according to claim 17, further comprising the step of detecting an electric signal flowing through the switching device, and outputting the control signal based on the detection result.