A bidirectionally adjustable power supply and a bidirectionally adjustable power supply adjustment method

Abstract

The present invention belongs to the technical field of power supply, and in particular, relates to an adjustable power supply capable of bidirectional swapping and a method for bidirectional swapping of an adjustable power supply, wherein the adjustable power supply capable of bidirectional swapping includes an output power conversion circuit, a power conversion control circuit, a built-in control logic circuit and a control knob, and also includes a signal buffer bidirectional output circuit and an adjustment signal flow port, wherein the signal buffer bidirectional output circuit is respectively connected to the power conversion control circuit and the built-in control logic circuit; the adjustment signal flow port is connected to the signal buffer bidirectional output circuit and is used to connect an external slave controlled adjustable power supply. The present invention avoids the problem of complex wiring caused by the need to connect to an external master control device in the prior art, and also eliminates the problem of difficulty in connection matching, and also has the advantages of simplified wiring, practical application and high stability of adjustment.

Description

Technical Field

[0001] The invention belongs to the technical field of power supply, and in particular relates to an adjustable power supply capable of bidirectional switching and a bidirectional switching method of an adjustable power supply. Background Art

[0002] The adjustable power supply adopts the current internationally advanced high-frequency modulation technology. Its working principle is to widen the voltage and current of the switching power supply, realize a wide range of voltage and current adjustment, and expand the application of DC power supply. Common adjustable power supplies include adjustable DC regulated power supplies. The design of adjustable DC regulated power supplies eliminates the bulky size of traditional DC power supplies due to power frequency transformers. Compared with traditional power supplies, high-frequency DC power supplies have the advantages of small size, light weight, and high efficiency. At the same time, the output voltage can be controlled by a touch switch.

[0003] However, the output adjustable power supplies currently on the market all work in a slave mode. Whether it is a single unit or a parallel unit, each power supply must rely on its built-in control device to receive or read the control signal from the external main control device to adjust its output current or output voltage. In this way, when the output adjustable power supply is connected to the external main control device, not only the wiring becomes complicated, which increases the difficulty of connection matching, but also affects the stability, and at the same time affects the voltage regulation efficiency, affects the user's use, and cannot meet the user's use needs. Therefore, it is necessary to design an adjustable power supply that can be bidirectionally swapped and an adjustable power supply bidirectional swap method. Summary of the invention

[0004] The purpose of the present invention is to provide an adjustable power supply that can be bidirectionally swapped and a method for bidirectionally swapping an adjustable power supply, aiming to solve the technical problems in the prior art that the adjustable power supply has complex wiring during adjustment, high difficulty in connection matching, affecting stability, and further affecting voltage regulation efficiency.

[0005] To achieve the above-mentioned object, an embodiment of the present invention provides a bidirectionally adjustable power supply, comprising an output power conversion circuit, a power conversion control circuit, a built-in control logic circuit and a control knob, wherein the power conversion control circuit and the built-in control logic circuit are both connected to the output power conversion circuit, and the control knob is connected to the built-in control logic circuit, and is characterized in that it also includes:

[0006] A signal buffer bidirectional output circuit, wherein the signal buffer bidirectional output circuit is arranged between the power conversion control circuit and the built-in control logic circuit, and is connected to the power conversion control circuit and the built-in control logic circuit respectively;

[0007] The regulating signal flow port is connected to the signal buffer bidirectional output circuit and is used to connect an external slave controlled adjustable power supply.

[0008] Optionally, the signal buffer bidirectional output circuit includes a first buffer circuit, an open-drain output circuit, a second buffer circuit and an emitter follower circuit, the first buffer circuit is connected to the built-in control logic circuit, the open-drain output circuit is connected to the first buffer circuit, the open-drain output circuit is also connected to both the adjustment signal flow port and the second buffer circuit, the emitter follower circuit is connected to the second buffer circuit, and the emitter follower circuit is also connected to the power conversion control circuit.

[0009] Optionally, the first buffer circuit includes a first comparator, a non-inverting input terminal of the first comparator is grounded, an inverting input terminal of the first comparator is connected to the built-in control logic circuit, and an output terminal of the first comparator is connected to the open-drain output circuit.

[0010] Optionally, the open-drain output circuit includes a first MOS tube and a first resistor, the gate of the first MOS tube is connected to the output end of the first comparator, the source of the first MOS tube is grounded, the drain of the first MOS tube is connected to the first resistor, the first resistor is also connected to a power supply end, and the drain of the first MOS tube is also connected to the second buffer circuit.

[0011] Optionally, the second buffer circuit includes a second comparator, the non-phase input terminal of the second comparator is connected to the drain of the first MOS tube, the inverting input terminal of the second comparator is connected to a second resistor and then connected to the power supply terminal, and the output terminal of the second comparator is connected to the emitter follower circuit.

[0012] Optionally, the emitter follower circuit includes an emitter follower and a third resistor, the base of the emitter follower is connected to the output end of the second comparator, the collector of the emitter follower is grounded, the emitter of the emitter follower is connected to the third resistor, the third resistor is also connected to the power supply end, and the emitter of the emitter follower is also connected to the power conversion control circuit.

[0013] Optionally, it also includes an optocoupler isolation circuit, which includes an isolation optocoupler, one end of the isolation optocoupler is connected to the emitter of the emitter follower, and the other end of the isolation optocoupler is connected to the power conversion control circuit.

[0014] Optionally, the first MOS transistor is an N-channel enhancement mode MOS transistor.

[0015] Optionally, the regulation signal flow port is a modulation signal input / output socket.

[0016] The above one or more technical solutions in the bidirectionally adjustable power supply provided by the embodiment of the present invention have at least one of the following technical effects:

[0017] The present invention sets the signal buffer bidirectional output circuit between the power conversion control circuit and the built-in control logic circuit, so that when adjusting, the knob adjustment signal generated when the control knob is turned is first obtained through the built-in control logic circuit, and then the built-in control logic circuit converts the knob adjustment signal into a pulse width modulation signal, and then sends the pulse width modulation signal to the signal buffer bidirectional output circuit. After passing through the signal buffer bidirectional output circuit, the pulse width modulation signal is passed to the power conversion control circuit in one way, thereby controlling the output power conversion circuit through the power conversion control circuit, and further controlling the output voltage of the bidirectionally switchable adjustable power supply itself; the other way is passed to the external slave controlled adjustable power supply through the set adjustment signal flow port to achieve the adjustment of other bidirectionally switchable adjustable power supplies, and then the bidirectional adjustment function of the bidirectionally switchable adjustable power supply is achieved through the setting of the signal buffer bidirectional output circuit, avoiding the wiring complexity caused by the need to connect an external main control device in the prior art, and also eliminating the difficulty of connection matching. It also has the advantages of simplified wiring, practical application and high adjustment stability.

[0018] To achieve the above object, an embodiment of the present invention provides a method for bidirectionally swapping an adjustable power supply, the method for bidirectionally swapping an adjustable power supply being applied to the above-mentioned bidirectionally swappable adjustable power supply, and the method for bidirectionally swapping an adjustable power supply comprising the following steps:

[0019] Step S100: the built-in control logic circuit obtains a knob adjustment signal generated when the control knob is turned;

[0020] Step S200: the built-in control logic circuit converts the knob adjustment signal into a pulse width modulation signal and sends the pulse width modulation signal to the signal buffer bidirectional output circuit;

[0021] Step S300: the signal buffer bidirectional output circuit sends the pulse width modulation signal to the power conversion control circuit and the regulating signal flow port respectively; wherein the regulating signal flow port is connected to an external slave controlled adjustable power supply.

[0022] The above one or more technical solutions in the adjustable power bidirectional switching method provided by the embodiment of the present invention have at least one of the following technical effects:

[0023] Since the method for bidirectionally swapping an adjustable power supply described in the present invention is applied to the above-mentioned adjustable power supply that can be bidirectionally swapped, the method for bidirectionally swapping an adjustable power supply described in the present invention also avoids the complex wiring problem caused by the need to connect an external main control device in the prior art, and also eliminates the difficulty of connection matching. It also has the advantages of simplified wiring, practical application and high stability of adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 A circuit structure block diagram of a bidirectionally adjustable power supply provided in an embodiment of the present invention;

[0026] Figure 2 A circuit schematic diagram of a bidirectionally-swappable signal buffer bidirectional output circuit provided by an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of a flow chart of a method for bidirectionally switching an adjustable power supply provided in an embodiment of the present invention.

[0028] Among them, the reference numerals in the figure are:

[0029] Output power conversion circuit 100, power conversion control circuit 200, built-in control logic circuit 300, control knob 400, signal buffer bidirectional output circuit 500, first buffer circuit 510, open-drain output circuit 520, second buffer circuit 530 and emitter follower circuit 540, optocoupler isolation circuit 550, and regulation signal flow port 600. DETAILED DESCRIPTION

[0030] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0031] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0032] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0033] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0034] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0035] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0036] In one embodiment of the present invention, Figure 1 As shown, a bidirectionally adjustable power supply is provided, including an output power conversion circuit 100, a power conversion control circuit 200, a built-in control logic circuit 300 and a control knob 400, wherein the power conversion control circuit 200 and the built-in control logic circuit 300 are both connected to the output power conversion circuit 100, and the control knob 400 is connected to the built-in control logic circuit 300.

[0037] Specifically, one end of the output power conversion circuit 100 is connected to external AC power, such as a mains power supply. The output power conversion circuit 100 is used to convert the connected AC power into DC power and output it. During the conversion process, the conversion control of the output power conversion circuit 100 is realized by the power conversion control circuit 200, and the power conversion control circuit 200 is controlled by the signal of the built-in control logic circuit 300. In this embodiment, the power conversion control circuit 200 can be set as a control circuit composed of a constant current / constant voltage control circuit or a PWM controller.

[0038] The built-in control logic circuit 300 is formed by a logic circuit composed of a microcontroller or an interface controller, which is used to receive an adjustment signal, convert the adjustment signal into a pulse width modulation signal and send the pulse width modulation signal to the power conversion control circuit 200, thereby controlling the power conversion control circuit 200.

[0039] In this embodiment, the control knob 400 is connected to the built-in control logic circuit 300. When the control knob 400 is turned, the voltage / current signal generated by the control knob 400 is the knob adjustment signal, which is also the adjustment signal received by the above-mentioned built-in control logic circuit.

[0040] Furthermore, the bidirectionally adjustable power supply further includes a signal buffer bidirectional output circuit 500 and an adjustment signal flow port 600. The signal buffer bidirectional output circuit 500 is disposed between the power conversion control circuit 300 and the built-in control logic circuit 400, and is connected to the power conversion control circuit 300 and the built-in control logic circuit 400 respectively; the adjustment signal flow port 600 is connected to the signal buffer bidirectional output circuit 500, and is used to connect an external slave controlled adjustable power supply.

[0041] The present invention sets the signal buffer bidirectional output circuit 500 between the power conversion control circuit 200 and the built-in control logic circuit 300, so that when adjusting, the knob adjustment signal generated when the control knob 400 is turned is first obtained through the built-in control logic circuit 500, and then the built-in control logic circuit 300 converts the knob adjustment signal into a pulse width modulation signal, and then sends the pulse width modulation signal to the signal buffer bidirectional output circuit 500. The pulse width modulation signal passes through the signal buffer bidirectional output circuit 500 and then passes through the power conversion control circuit 200, thereby 200 controls the output power conversion circuit 100, and further controls the output voltage of the bidirectionally switchable adjustable power supply itself; the other way is connected to the external slave controlled adjustable power supply through the set adjustment signal flow port 600, so as to realize the adjustment of other bidirectionally switchable adjustable power supplies, and further realize the bidirectional adjustment function of the bidirectionally switchable adjustable power supply through the setting of the signal buffer bidirectional output circuit 500, avoiding the complex wiring problem caused by the need to connect to an external main control device in the prior art, and also eliminating the difficulty of connection matching, and also has the advantages of simplified wiring, practical application and high stability of adjustment.

[0042] In another embodiment of the present invention, Figure 1-Figure 2 As shown, the signal buffer bidirectional output circuit 500 includes a first buffer circuit 510 , an open-drain output circuit 520 , a second buffer circuit 530 and an emitter follower circuit 540 .

[0043] Among them, the first buffer circuit 510 is connected to the built-in control logic circuit 300, the open-drain output circuit 520 is connected to the first buffer circuit 510, the open-drain output circuit 520 is also connected to both the adjustment signal flow port 600 and the second buffer circuit 530, the emitter follower circuit 540 is connected to the second buffer circuit 530, and the emitter follower circuit 540 is also connected to the power conversion control circuit 200.

[0044] Specifically, after the built-in control logic circuit 300 converts the knob adjustment signal into a pulse width modulation signal, the pulse width modulation signal is sent to the first buffer circuit 510, and the pulse width modulation signal is buffered by the first buffer circuit 510 and then output by the open drain output circuit 520 in an open drain mode.

[0045] Then, the pulse width modulation signal output in the open-drain mode flows through the second buffer circuit 520 for buffering and is output to the power conversion control circuit 200 by the emitter follower circuit 540, thereby enabling the power conversion control circuit 200 to control the output power conversion circuit 100 according to the pulse width modulation signal. At this time, the adjustment of the main body of the bidirectionally adjustable power supply is realized. At this time, the bidirectionally adjustable power supply can be understood as the host.

[0046] Furthermore, the pulse width modulation signal output in the open-drain mode flows to the adjustment signal flow port 600 in another path. Since the adjustment signal flow port 600 is connected to the external slave-controlled adjustable power supply, that is, when the pulse width modulation signal flows to the external slave-controlled adjustable power supply through the adjustment signal flow port 600, the external slave-controlled adjustable power supply can be regulated. Here, the external slave-controlled adjustable power supply can be understood as a slave.

[0047] Furthermore, by setting up the first buffer circuit 510, the open-drain output circuit 520, the second buffer circuit 530 and the emitter follower circuit 540, each adjustable power supply that needs to be adjusted can work as a host or a slave, thereby realizing two-way swapping between the host and the slave, improving the adjustment efficiency, and meeting the user's usage needs.

[0048] In another embodiment of the present invention, Figure 1-Figure 2As shown, the first buffer circuit 510 includes a first comparator U1, a non-inverting input terminal of the first comparator U1 is grounded, an inverting input terminal of the first comparator U1 is connected to the built-in control logic circuit 300, and an output terminal of the first comparator U1 is connected to the open-drain output circuit 520. Specifically, the pulse width modulation signal is sent to the first comparator U1, and the first comparator U1 shapes and inverts the pulse width modulation signal, thereby outputting a neat pulse width modulation signal to the open-drain output circuit 520.

[0049] In another embodiment of the present invention, Figure 1-Figure 2 As shown, the open-drain output circuit 520 includes a first MOS transistor Q1 and a first resistor, the gate of the first MOS transistor Q1 is connected to the output end of the first comparator U1, the source of the first MOS transistor Q1 is grounded, the drain of the first MOS transistor Q1 is connected to the first resistor R1, the first resistor R1 is also connected to a power supply end VCC, and the drain of the first MOS transistor Q1 is also connected to the second buffer circuit 530. Specifically, after the neat pulse width modulation signal output by the first comparator U1 is passed to the gate of the first MOS transistor Q1, it is output through the gate open drain of the first MOS transistor Q1, one way is output to the second buffer circuit 530, and the other way is output to the adjustment signal flow port 600.

[0050] In another embodiment of the present invention, Figure 2 As shown, the second buffer circuit 530 includes a second comparator U2, a non-inverting input terminal of the second comparator U2 is connected to the drain of the first MOS transistor Q1, an inverting input terminal of the second comparator U2 is connected to the power supply terminal VCC after being connected to a second resistor R2, and an output terminal of the second comparator U2 is connected to the emitter follower circuit 540. Specifically, the pulse width modulation signal outputted through the gate open drain of the first MOS transistor Q1 is outputted to the second comparator U2, the pulse width modulation signal is shaped and positively amplified by the second comparator U2, and is outputted to the emitter follower circuit 540 after amplification.

[0051] Furthermore, the first comparator U1 and the second comparator U2 may be selected as separate comparators, or an integrated IC including two comparators, such as LM2903, which is not specifically limited in the present invention.

[0052] In another embodiment of the present invention, Figure 2As shown, the emitter follower circuit 540 includes an emitter follower Q2 and a third resistor R3, the base of the emitter follower Q2 is connected to the output end of the second comparator U2, the collector of the emitter follower Q2 is grounded, the emitter of the emitter follower Q2 is connected to the third resistor R3, the third resistor R3 is also connected to the power supply end VCC, and the emitter of the emitter follower Q2 is also connected to the power conversion control circuit 200. In this embodiment, the emitter follower Q2 is a triode. The pulse width modulation signal output by the second comparator U2 is output to the emitter follower Q2, and then output to the power conversion control circuit 200.

[0053] Furthermore, by providing the emitter follower Q2 to connect the second buffer circuit 530 and the power conversion control circuit 200, the impact of direct connection between circuits is reduced, a buffering effect is played, the hardware circuit structure is protected, and the circuit structure stability is improved.

[0054] In another embodiment of the present invention, Figure 1-Figure 2 As shown, the bidirectionally adjustable power supply further includes an optocoupler isolation circuit 550, and the optocoupler isolation circuit 550 includes an isolation optocoupler U3, one end of the isolation optocoupler U3 is connected to the emitter of the emitter follower Q2, and the other end of the isolation optocoupler U3 is connected to the power conversion control circuit 200. By providing the isolation optocoupler U3, isolation is achieved, interference is reduced, and the overall structural stability of the circuit is improved.

[0055] In another embodiment of the present invention, the first MOS transistor Q1 is an N-channel enhancement type MOS transistor. In another embodiment of the present invention, the adjustment signal flow port 600 is a modulation signal input / output socket. In this embodiment, the modulation signal input / output socket can be set on a bidirectionally adjustable power supply, so as to facilitate the connection between different bidirectionally adjustable power supplies, which is convenient and fast.

[0056] In another embodiment of the present invention, Figure 3 As shown, a method for bidirectionally swapping an adjustable power supply is also provided. The bidirectional swapping method is applied to the above-mentioned bidirectionally swappable adjustable power supply. The bidirectional swapping method comprises the following steps:

[0057] Step S100: the built-in control logic circuit 300 obtains a knob adjustment signal generated when the control knob 400 is turned;

[0058] In this step, when it is necessary to adjust the output of the bidirectionally adjustable power supply, it is necessary to turn the control knob 400. After turning the control knob 400, the control knob 400 generates a knob adjustment signal. The built-in control logic circuit 300 is connected to the control knob 400 and can obtain the knob adjustment signal generated when the control knob 400 is turned in real time.

[0059] Step S200: the built-in control logic circuit 300 converts the knob adjustment signal into a pulse width modulation signal and sends the pulse width modulation signal to the signal buffer bidirectional output circuit 500;

[0060] Step S300: the pulse width modulation signal is respectively passed to the power conversion control circuit 200 and the regulating signal flow port 600 via the signal buffer bidirectional output circuit 500; wherein the regulating signal flow port 600 is connected to an external slave controlled adjustable power supply.

[0061] Specifically, in this step, the pulse width modulation signal is passed through the signal buffer bidirectional output circuit 500 to the power conversion control circuit 200 and the adjustment signal flow port 600 respectively, thereby realizing bidirectional adjustment of the host and the slave, which is efficient, fast and stable.

[0062] Since the method for bidirectionally swapping an adjustable power supply described in the present invention is applied to the above-mentioned adjustable power supply that can be bidirectionally swapped, the method for bidirectionally swapping an adjustable power supply described in the present invention also avoids the complex wiring problem caused by the need to connect an external main control device in the prior art, and also eliminates the difficulty of connection matching. It also has the advantages of simplified wiring, practical application and high stability of adjustment.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for bidirectionally switching an adjustable power supply, characterized in that: The adjustable power supply bidirectional switching method is applied to an adjustable power supply capable of bidirectional switching; The bidirectionally adjustable power supply comprises an output power conversion circuit, a power conversion control circuit, a built-in control logic circuit and a control knob. The power conversion control circuit and the built-in control logic circuit are both connected to the output power conversion circuit, and the control knob is connected to the built-in control logic circuit. The bidirectionally adjustable power supply further includes: A signal buffer bidirectional output circuit, wherein the signal buffer bidirectional output circuit is arranged between the power conversion control circuit and the built-in control logic circuit, and is connected to the power conversion control circuit and the built-in control logic circuit respectively; An adjustment signal flow port, the adjustment signal flow port is connected to the signal buffer bidirectional output circuit and is used to connect an external slave controlled adjustable power supply; The signal buffer bidirectional output circuit comprises a first buffer circuit, an open-drain output circuit, a second buffer circuit and an emitter follower circuit, wherein the first buffer circuit is connected to the built-in control logic circuit, the open-drain output circuit is connected to the first buffer circuit, the open-drain output circuit is also connected to both the regulating signal flow port and the second buffer circuit, the emitter follower circuit is connected to the second buffer circuit, and the emitter follower circuit is also connected to the power conversion control circuit; The first buffer circuit comprises a first comparator, a non-inverting input terminal of the first comparator is grounded, an inverting input terminal of the first comparator is connected to the built-in control logic circuit, and an output terminal of the first comparator is connected to the open-drain output circuit; The adjustable power bidirectional switching method comprises the following steps: Step S100: the built-in control logic circuit obtains a knob adjustment signal generated when the control knob is turned; Step S200: the built-in control logic circuit converts the knob adjustment signal into a pulse width modulation signal and sends the pulse width modulation signal to the signal buffer bidirectional output circuit; Step S300: the pulse width modulation signal is respectively passed to the power conversion control circuit and the regulating signal flow port through the signal buffer bidirectional output circuit; wherein the regulating signal flow port is connected to an external slave controlled adjustable power supply.

2. The adjustable power bidirectional switching method according to claim 1, characterized in that: The open-drain output circuit includes a first MOS tube and a first resistor, wherein the gate of the first MOS tube is connected to the output end of the first comparator, the source of the first MOS tube is grounded, the drain of the first MOS tube is connected to the first resistor, the first resistor is also connected to a power supply end, and the drain of the first MOS tube is also connected to the second buffer circuit.

3. The adjustable power bidirectional switching method according to claim 2, characterized in that: The second buffer circuit includes a second comparator, a non-inverting input terminal of the second comparator is connected to the drain of the first MOS tube, an inverting input terminal of the second comparator is connected to the power supply terminal after being connected to a second resistor, and an output terminal of the second comparator is connected to the emitter follower circuit.

4. The adjustable power bidirectional switching method according to claim 3, characterized in that: The emitter follower circuit includes an emitter follower and a third resistor, the base of the emitter follower is connected to the output end of the second comparator, the collector of the emitter follower is grounded, the emitter of the emitter follower is connected to the third resistor, the third resistor is also connected to the power supply end, and the emitter of the emitter follower is also connected to the power conversion control circuit.

5. The adjustable power bidirectional switching method according to claim 4, characterized in that: It also includes an optocoupler isolation circuit, which includes an isolation optocoupler, one end of the isolation optocoupler is connected to the emitter of the emitter follower, and the other end of the isolation optocoupler is connected to the power conversion control circuit.

6. The adjustable power bidirectional switching method according to claim 5, characterized in that: The first MOS transistor is an N-channel enhancement mode MOS transistor.

7. The adjustable power bidirectional switching method according to claim 6, characterized in that: The modulation signal flow port is a modulation signal input / output socket.

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