Power supply circuit and electronic equipment

Abstract

The invention discloses a power supply circuit and electronic equipment. The power supply circuit comprises a rectification circuit which is connected with an AC bus, the AC bus comprises a first AC bus and a second AC bus, and the polarity of the voltage on the first AC bus is opposite to that of the voltage on the second AC bus; the rectifying circuit comprises a bridge arm, the bridge arm comprises two transistors connected between the first alternating current bus and the second alternating current bus in series, in at least one bridge arm, the grid electrode of the transistor connected with the first alternating current bus is connected with the second alternating current bus, and the grid electrode of the transistor connected with the second alternating current bus is connected with the first alternating current bus. According to the embodiment of the invention, electric energy loss of the power supply circuit can be reduced, and low power consumption can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of power supply circuits, and in particular to a power supply circuit and an electronic device. Background Art

[0002] With the rapid development of scientific information technology, electronic products are widely used in people's daily lives. Electronic products usually require direct current, and direct current is generally converted into direct current by rectifying alternating current.

[0003] As an important performance indicator of a circuit, power consumption is an issue that users have always been concerned about. Therefore, how to reduce the power consumption of a power supply circuit is an issue that those skilled in the art have devoted themselves to studying. Summary of the invention

[0004] The embodiments of the present application provide a power supply circuit and an electronic device, which can reduce the power loss of the power supply circuit and facilitate achieving low power consumption.

[0005] In a first aspect, an embodiment of the present application provides a power supply circuit, comprising: a rectifier circuit connected to an AC bus, the AC bus comprising a first AC bus and a second AC bus, the voltage on the first AC bus having an opposite polarity to the voltage on the second AC bus; the rectifier circuit comprising a bridge arm, the bridge arm comprising two transistors connected in series between the first AC bus and the second AC bus, and in at least one bridge arm, the gate of the transistor connected to the first AC bus is connected to the second AC bus, and the gate of the transistor connected to the second AC bus is connected to the first AC bus.

[0006] In a possible implementation of the first aspect, the bridge arm includes a first bridge arm and a second bridge arm;

[0007] The first bridge arm includes a first transistor and a third transistor, and the second bridge arm includes a second transistor and a fourth transistor;

[0008] A first electrode of the first transistor is connected to the first AC bus, a second electrode of the first transistor is connected to the first electrode of the third transistor, and a gate of the first transistor is connected to the second AC bus;

[0009] The second electrode of the third transistor is connected to the second AC bus, and the gate of the third transistor is connected to the first AC bus;

[0010] A first electrode of the fourth transistor is connected to the first AC bus, a second electrode of the fourth transistor is connected to the first electrode of the second transistor, and a gate of the fourth transistor is connected to the second AC bus;

[0011] The second electrode of the second transistor is connected to the second AC bus, and the gate of the second transistor is connected to the first AC bus;

[0012] The first transistor and the third transistor are N-type transistors, and the second transistor and the fourth transistor are P Type transistor;

[0013] Preferably, the transistors in the power circuit are thin film transistors.

[0014] In a possible implementation manner of the first aspect, the power supply circuit further includes:

[0015] The detection circuit is connected to the output end of the power supply circuit, and is used to detect the voltage output by the power supply circuit.

[0016] In a possible implementation of the first aspect, the detection circuit includes a first resistor, a second resistor, a third resistor, and a fifth transistor;

[0017] A first end of the first resistor is connected to the output end of the power supply circuit, a second end of the first resistor is connected to the first end of the second resistor, and a second end of the second resistor is connected to the ground end;

[0018] A first electrode of the fifth transistor is connected to a first end of the first resistor, a second electrode of the fifth transistor is connected to a first end of the third resistor, a gate of the fifth transistor is connected to a second end of the first resistor, and a second end of the third resistor is connected to the ground terminal;

[0019] The fifth transistor includes a P-type transistor;

[0020] Preferably, the resistance values ​​of the first resistor, the second resistor and the third resistor are equal.

[0021] In a possible implementation manner of the first aspect, the power supply circuit further includes:

[0022] A limiting circuit is connected between the AC bus and the ground terminal and is used to limit the voltage amplitude on the AC bus;

[0023] Preferably, the amplitude limiting circuit is also electrically connected to a detection circuit in the power supply circuit, and the amplitude limiting circuit is turned on or off under the control of the detection circuit.

[0024] In a possible implementation of the first aspect, the limiting circuit includes a sixth transistor and a fourth resistor, a first end of the fourth resistor is connected to the first AC bus, a second end of the fourth resistor is connected to a first electrode of the sixth transistor, a second electrode of the sixth transistor is connected to a ground terminal, and a gate of the sixth transistor is connected to a control signal transmitted by the detection circuit;

[0025] And / or, the limiting circuit includes a seventh transistor and a fifth resistor, a first end of the fifth resistor is connected to the second AC bus, a second end of the fifth resistor is connected to a first electrode of the seventh transistor, a second electrode of the seventh transistor is connected to a ground terminal, and a gate of the seventh transistor is connected to a control signal transmitted by the detection circuit;

[0026] Preferably, the gate of the sixth transistor and the gate of the seventh transistor are connected to a detection point of the detection circuit;

[0027] Preferably, the detection point is located in the transmission path from the fifth transistor of the detection circuit to the ground terminal;

[0028] Preferably, the resistance values ​​of the fourth resistor and the fifth resistor are equal.

[0029] In a possible implementation of the first aspect, the power supply circuit further includes a limiting circuit connected between the AC bus and the ground terminal, and configured to limit the voltage amplitude on the AC bus;

[0030] The resistance value of the resistor in the detection circuit is greater than the resistance value of the resistor in the limiter circuit;

[0031] Preferably, the resistance value of the resistor in the detection circuit is greater than or equal to 100K ohms;

[0032] Preferably, the resistance value of the resistor in the amplitude limiting circuit is less than or equal to 2K ohms.

[0033] In a possible implementation manner of the first aspect, the power supply circuit further includes:

[0034] A current limiting module is connected between the output end of the rectifier circuit and the output end of the power supply circuit;

[0035] Preferably, the current limiting module includes a sixth resistor.

[0036] In a possible implementation manner of the first aspect, the power supply circuit further includes:

[0037] A filter module connected to an output end of a power supply circuit;

[0038] Preferably, the filtering module comprises a capacitor, one end of which is connected to the second AC bus, and the other end of which is connected to the output end of the rectifier circuit.

[0039] Based on the same inventive concept, in a second aspect, an embodiment of the present application further provides an electronic device, comprising a power supply circuit as described in any embodiment of the first aspect.

[0040] According to the power supply circuit and electronic device provided in the embodiments of the present application, the transistors in the rectifier circuit are controlled by signals on the first AC bus and the second AC bus, and the diode connection method is abandoned and signal control is adopted. In this way, the transistors can be in a linear region when turned on, which can reduce the voltage difference of the transistor channel. The on-resistance is lower than the resistance connected in a diode state, thereby making the output efficiency higher and more energy-saving. In other words, the energy loss of the power supply circuit can be reduced, which is conducive to achieving low power consumption.

[0041] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features and the accompanying drawings are not drawn to scale.

[0043] FIG1 shows a schematic diagram of a structure of a power supply circuit provided in an embodiment of the present application;

[0044] FIG2 shows a timing diagram of an AC signal;

[0045] FIG3 is a schematic diagram showing a working state of the power supply circuit in FIG1 ;

[0046] FIG4 is a schematic diagram showing another working state of the power supply circuit in FIG1 ;

[0047] FIG5 shows another schematic diagram of the structure of the power supply circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0050] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "on" or "over" another layer or another region, it may mean that it is directly on the other layer or another region, or that other layers or regions are included between it and the other layer or another region. Moreover, if the component is turned over, the layer or a region will be "below" or "beneath" another layer or another region.

[0051] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0052] It should be noted that when an element is described as being “connected” or “electrically connected” to another element, it may be directly connected to the other element, or one or more intervening elements may exist therebetween.

[0053] It is obvious to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit or scope of the present application. Therefore, the present application is intended to cover modifications and changes of the present application that fall within the scope of the corresponding claims (technical solutions for protection) and their equivalents. It should be noted that the implementation methods provided in the embodiments of the present application can be combined with each other without contradiction.

[0054] Before describing the technical solutions provided by the embodiments of the present application, in order to facilitate the understanding of the embodiments of the present application, the present application first specifically describes the problems existing in the related art:

[0055] The rectifier circuit in the related art uses a metal-oxide semiconductor field effect transistor (Metal-Oxid e -Semiconductorr Field-Effect Transistor r , MOSFET) is connected into a diode to form a unidirectional conduction effect. Due to the threshold voltage (Vth) of MOS devices, MOS devices connected into a diode will have a voltage drop when making a rectifier circuit, resulting in energy waste and not conducive to low power consumption.

[0056] In order to solve the above technical problems, the embodiments of the present application provide a power supply circuit and an electronic device. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0057] like Figure 1 As shown, the power supply circuit provided in the embodiment of the present application includes a rectifier circuit 10. The rectifier circuit is connected to the AC bus, and the AC bus includes a first AC bus LA and a second AC bus LB. The voltage on the first AC bus LA is opposite to the polarity of the voltage on the second AC bus LB. When the first AC bus LA is a positive voltage, the second AC bus LB is a negative voltage; conversely, when the first AC bus LA is a negative voltage, the second AC bus LB is a positive voltage. Exemplarily, the amplitude of the voltage on the first AC bus LA and the voltage on the second AC bus LB may be equal.

[0058] The rectifier circuit 10 includes a bridge arm, which includes two transistors connected in series between a first AC bus LA and a second AC bus LB. Figure 1 The rectifier circuit 10 is schematically shown to include two bridge arms, namely a first bridge arm 11 and a second bridge arm 12 , and each bridge arm may include two transistors connected in series.

[0059] In at least one bridge arm, the gate of the transistor connected to the first AC bus LA is connected to the second AC bus LB, and the gate of the transistor connected to the second AC bus LB is connected to the first AC bus LA.

[0060] For example, the first bridge arm 11 includes a first transistor T1 and a third transistor T3, the transistor connected to the first AC bus LA in the first bridge arm 11 is the first transistor T1, the transistor connected to the second AC bus LB is the third transistor T3, the gate of the first transistor T1 is connected to the second AC bus LB, and the gate of the third transistor T3 is connected to the first AC bus LA.

[0061] In the embodiment of the present application, the transistors in the rectifier circuit are controlled by signals on the first AC bus LA and the second AC bus LB. The diode connection method is abandoned and signal control is adopted. In this way, the transistors can be in a linear region when turned on, which can reduce the voltage difference of the transistor channel. The on-resistance is lower than the resistance connected in a diode state, thereby making the output efficiency higher and more energy-saving. In other words, the energy loss of the power supply circuit can be reduced, which is conducive to achieving low power consumption.

[0062] It is understandable that the rectifier circuit can convert alternating current into direct current. The voltage outputted by the output terminal of the rectifier circuit can supply power to the load.

[0063] The specific structure of the rectifier circuit is introduced as an example below. It should be noted that this is not a limitation of the present application. In other examples, the rectifier circuit can also be set in other forms.

[0064] like Figure 1 As shown, the bridge arm in the rectifier circuit 10 includes a first bridge arm 11 and a second bridge arm 12. The first bridge arm 11 includes a first transistor T1 and a third transistor T3, and the second bridge arm 12 includes a second transistor T2 and a fourth transistor T4. The first transistor T1 and the third transistor T3 are N-type transistors, and the second transistor T2 and the fourth transistor T4 are P-type transistors.

[0065] Among them, the first electrode of the first transistor T1 is connected to the first AC bus LA, the second electrode of the first transistor T1 is connected to the first electrode of the third transistor T3, and the gate of the first transistor T1 is connected to the second AC bus LB; the second electrode of the third transistor T3 is connected to the second AC bus LB, and the gate of the third transistor T3 is connected to the first AC bus LA; the first electrode of the fourth transistor T4 is connected to the first AC bus LA, the second electrode of the fourth transistor T4 is connected to the first electrode of the second transistor T2, and the gate of the fourth transistor T4 is connected to the second AC bus LB; the second electrode of the second transistor T2 is connected to the second AC bus LB, and the gate of the second transistor T2 is connected to the first AC bus LA.

[0066] In addition, the second electrode of the first transistor T1 and the first electrode of the third transistor T3 are connected to the ground terminal, and the first electrode of the second transistor T2 and the second electrode of the fourth transistor T4 are connected to the output terminal Vout of the power supply circuit. The output terminal Vout of the power supply circuit is connected to the load to supply power to the load. It is understandable that the first electrode of the second transistor T2 and the second electrode of the fourth transistor T4 serve as the output terminal of the rectifier circuit 10.

[0067] Since the polarity of the voltage on the first AC bus is opposite to that on the second AC bus, and the first transistor T1 and the third transistor T3 are N-type transistors, and the second transistor T2 and the fourth transistor T4 are P-type transistors, during operation, the states of the first transistor T1 and the third transistor T3 are opposite, and the states of the second transistor T2 and the fourth transistor T4 are opposite. When the first transistor T1 is turned on, the third transistor T3 is turned off, and vice versa, when the first transistor T1 is turned off, the third transistor T3 is turned on. When the second transistor T2 is turned on, the fourth transistor T4 is turned off, and vice versa, when the second transistor T2 is turned off, the fourth transistor T4 is turned on.

[0068] Please refer to Figure 2 , Figure 2 The horizontal axis represents time, and the vertical axis represents the signal input to the AC bus. For example, the signal input to the AC bus is a sine wave signal, including a positive half cycle and a negative half cycle. In the positive half cycle, the first AC bus LA is at a high voltage, and the second AC bus LB is at a low voltage; in the negative half cycle, the first AC bus LA is at a low voltage, and the second AC bus LB is at a high voltage.

[0069] When the AC input is in the positive half cycle, the working state of the power supply circuit can be as follows: Figure 3 As shown, when the AC input is in the negative half cycle, the working state of the power supply circuit can be as follows Figure 4 In addition, Figure 3 and Figure 4 Here, RL represents the load.

[0070] When the first AC bus LA is at high voltage and the second AC bus LB is at low voltage, Figure 3 As shown, the first transistor T1 and the second transistor T2 are turned off, the third transistor T3 and the fourth transistor T4 are turned on, and the current path is as follows: Figure 3 As shown by the line with arrows, the current passes through the fourth transistor T4, the load RL, and the third transistor T3.

[0071] When the voltage on the first AC bus LA is low and the voltage on the second AC bus LB is high, Figure 4 As shown, the first transistor T1 and the second transistor T2 are turned on, the third transistor T3 and the fourth transistor T4 are turned off, and the current path is as follows: Figure 4 As shown by the line with arrows, the current passes through the second transistor T2, the load RL, and the first transistor T1.

[0072] In the embodiment of the present application, the first transistor to the fourth transistor are all signal controlled and the diode connection method is abandoned. In this way, the first transistor to the fourth transistor can be in the linear region when turned on, and the on-resistance is lower than the resistance value of the diode state, so the voltage drop value is smaller and the power loss is smaller.

[0073] It should be noted that the above examples illustrate that the rectifier circuit includes two bridge arms. In other examples, the rectifier circuit may include more than two bridge arms.

[0074] In the related art, the power circuit is based on the integrated circuit design of single crystal silicon, and the transistor devices in the circuit are all silicon-based MOS devices. MOS devices have the advantages of ideal performance, low leakage, small size, etc. However, silicon-based MOS devices cannot be made on flexible substrates, so flexible electronic systems cannot be realized.

[0075] The field of flexible electronics is currently in a stage of vigorous development, and how to achieve fully flexible power circuits has become a very hot topic.

[0076] In some embodiments, the transistors in the power circuit may be thin film transistors, which facilitates the realization of a fully flexible power circuit.

[0077] For example, the transistor P-type transistor in the power circuit may be low temperature polysilicon (L w Temperature Poly-Silicon, LTPS) thin film transistor, the N-type transistor can be a LTPS thin film transistor or an Indium Gallium Zinc Oxide (IndiumGalliu m Zin c Oxid e , IGZO) thin film transistor.

[0078] The power supply circuit can convert AC power into DC power to supply power to the load. The load has certain requirements for the voltage amplitude. Therefore, it is also very important to detect the output voltage of the power supply circuit.

[0079] In some embodiments, Figure 5 As shown, the power supply circuit may further include a detection circuit 20, which is connected to the output terminal Vout of the power supply circuit. The detection circuit 20 is used to detect the voltage output by the power supply circuit.

[0080] In the embodiment of the present application, by setting up a detection circuit, the output voltage of the power supply circuit can be detected, which facilitates the control of the output voltage of the power supply circuit so that the voltage output by the power supply circuit meets the demand.

[0081] The following is an exemplary introduction to the specific structure of the detection circuit, which should be noted that this is not a limitation of the present application. In other examples, the detection circuit can also be set to other forms as long as the voltage detection can be achieved.

[0082] In some embodiments, please refer to Figure 5 The detection circuit 20 includes a first resistor R1, a second resistor R2, a third resistor R3 and a fifth transistor T5. The fifth transistor T5 includes a P-type transistor.

[0083] Among them, the first end of the first resistor R1 is connected to the output end Vout of the power supply circuit, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is connected to the ground end; the first electrode of the fifth transistor T5 is connected to the first end of the first resistor R1, the second electrode of the fifth transistor T5 is connected to the first end of the third resistor R3, the gate of the fifth transistor T5 is connected to the second end of the first resistor R1, and the second end of the third resistor R3 is connected to the ground end.

[0084] The first resistor R1 and the second resistor R2 divide the voltage output by the power supply circuit, and the divided voltage potential controls the gate of the fifth transistor T5.

[0085] For the convenience of explanation, in the figure, the connection point between the second electrode of the fifth transistor T5 and the first end of the third resistor R3 is marked as a detection point FB.

[0086] When the output terminal Vout voltage is lower than the target value, the |Vgs| obtained by dividing the voltage of the first resistor R1 and the second resistor R2 is small, and the fifth transistor T5 cannot be turned on, or is only weakly turned on, resulting in a large equivalent resistance of the channel of the fifth transistor T5, and a very low voltage at the detection point FB. Wherein, Vgs refers to the voltage difference between the gate and the source of the fifth transistor T5.

[0087] When the output terminal Vout voltage is higher than the target value, the |Vgs| obtained by dividing the voltage of the first resistor R1 and the second resistor R2 becomes larger, so that the fifth transistor T5 tends to be turned on. When the output terminal Vout exceeds the target value and continues to increase, the channel current of the fifth transistor T5 increases exponentially, its equivalent resistance drops sharply, and the voltage of the detection point FB increases significantly.

[0088] In the embodiment of the present application, the gate of the fifth transistor T5 is controlled by the voltage-dividing node of two resistors. In this way, the characteristic that the current in the linear region of the transistor is exponentially related to Vgs can be utilized to design an amplification circuit, so that the potential change of the detection point FB is more sensitive, thereby improving the detection sensitivity.

[0089] Exemplarily, the first resistor R1 , the second resistor R2 , and the third resistor R3 may be large-value resistors, which can reduce the current in the detection circuit and help reduce power loss.

[0090] For example, the resistance values ​​of the first resistor R1 , the second resistor R2 , and the third resistor R3 may be greater than or equal to 100K ohms.

[0091] In some examples, the resistance values ​​of the first resistor R1 , the second resistor R2 , and the third resistor R3 are equal.

[0092] In addition, circuit simulation can be performed according to the target value of the power circuit output voltage to detect parameters of each device in the circuit, and the parameters may include the size of the fifth transistor T5, and the resistance values ​​of the first resistor R1, the second resistor R2, and the third resistor R3.

[0093] The load has certain requirements for the voltage amplitude. When the voltage output by the power supply circuit is too high, a limiting circuit can be used to limit the voltage output by the power supply circuit.

[0094] In some embodiments, Figure 5 As shown, the power supply circuit further includes a limiting circuit 30, which is connected between the AC bus and the ground terminal and is used to limit the voltage amplitude on the AC bus.

[0095] In the embodiment of the present application, by setting a limiting circuit, the amplitude of the input voltage of the power supply circuit can be limited, and then the amplitude of the output voltage of the power supply circuit can be limited, so that the voltage output by the power supply circuit meets the requirements.

[0096] Exemplarily, the amplitude limiting circuit 30 can be connected to both the first AC bus LA and the second AC bus LB, so that the amplitude of the voltage input to the first AC bus LA and the second AC bus LB can be limited.

[0097] Exemplarily, the amplitude limiting circuit 30 is also electrically connected to the detection circuit 20 in the power supply circuit, and the amplitude limiting circuit 30 is turned on or off under the control of the detection circuit 20. For example, when the detection circuit 20 detects that the voltage at the output terminal Vout is too high, the detection circuit 20 controls the amplitude limiting circuit 30 to be turned on, thereby releasing the excess charge on the AC bus to achieve the purpose of amplitude limiting.

[0098] The specific structure of the amplitude limiting circuit is introduced as an example below. It should be noted that this is not a limitation of the present application. In other examples, the amplitude limiting circuit can also be set to other forms as long as the voltage amplitude can be limited.

[0099] In some embodiments, Figure 5 As shown, the limiting circuit 30 includes a sixth transistor T6 and a fourth resistor R4, the first end of the fourth resistor R4 is connected to the first AC bus LA, the second end of the fourth resistor R4 is connected to the first electrode of the sixth transistor T6, the second electrode of the sixth transistor T6 is connected to the ground terminal, and the gate of the sixth transistor T6 is connected to the control signal transmitted by the detection circuit; and / or, the limiting circuit 30 includes a seventh transistor T7 and a fifth resistor R5, the first end of the fifth resistor R5 is connected to the second AC bus LB, the second end of the fifth resistor R5 is connected to the first electrode of the seventh transistor T7, the second electrode of the seventh transistor T7 is connected to the ground terminal, and the gate of the seventh transistor T7 is connected to the control signal transmitted by the detection circuit.

[0100] The control signal connected to the gate of the sixth transistor T6 can control the sixth transistor T6 to be turned on or off, and the control signal connected to the gate of the seventh transistor T7 can control the seventh transistor T7 to be turned on or off.

[0101] For example, when the voltage at the output terminal Vout is too high, the sixth transistor T6 and the seventh transistor T7 can be controlled to be turned on to discharge the excess charge on the first AC bus LA and the second AC bus LB, thereby achieving the purpose of limiting.

[0102] In some embodiments, Figure 5 As shown, the gate of the sixth transistor T6 and the gate of the seventh transistor T7 are connected to the detection point FB of the detection circuit 20. In this way, the automatic control of the limiter circuit 30 can be realized. In addition, the detection circuit 20 uses the characteristic that the current in the linear region of the fifth transistor T5 is exponentially related to Vgs, and is designed as an amplifier circuit to make the potential change of the detection point FB more sensitive, which can prompt the limiter circuit 30 to discharge more quickly and achieve the limiter function.

[0103] Exemplarily, the detection point FB is located in a transmission path from the fifth transistor of the detection circuit to the ground terminal.

[0104] For example, the fourth resistor R4 and the fifth resistor R5 can be small resistors, so that the limiter circuit can have a large charge release capacity and a fast release speed. For example, the resistance value of the fourth resistor R4 and the fifth resistor R5 can be less than or equal to 20K ohms.

[0105] In some examples, the fourth resistor R4 and the fifth resistor R5 have the same resistance value.

[0106] It is understandable that, when the power supply circuit includes a detection circuit 20 and a limiting circuit 30, the resistance value of the resistor in the detection circuit 20 is greater than the resistance value of the resistor in the limiting circuit 30. In this way, the current on the detection circuit can be reduced, which is beneficial to reducing power loss; and the limiter circuit can have a large charge release capacity and a fast release speed.

[0107] In some embodiments, to prevent the output current of the rectifier circuit from being too large, Figure 5 As shown, the power supply circuit further includes a current limiting module 40, which is connected between the output end of the rectifier circuit 10 and the output end Vout of the power supply circuit.

[0108] As an example, the current limiting module 40 includes a sixth resistor R6.

[0109] Of course, in other examples, other structures may be used for current limiting. Using resistors for current limiting is only an example and is not intended to limit the present application.

[0110] In some embodiments, to filter interference signals, such as Figure 5 As shown, the power supply circuit further includes a filter module 50, and the filter module 50 is connected to the output terminal Vout of the power supply circuit.

[0111] As an example, the filtering module 50 includes a capacitor C, one end of the capacitor C is connected to the second AC bus LB, and the other end of the capacitor C is connected to the output end of the rectifier circuit 10 .

[0112] Of course, in other examples, other structures may be used for filtering, and filtering using capacitors is merely an example and is not intended to limit the present application.

[0113] It can be understood that the sixth resistor R6 and the capacitor C together can form an RC filter.

[0114] It should be noted that the transistors in the embodiments of the present application may be partially N-type transistors and partially P-type transistors. For N-type transistors, the on-level is a high level and the off-level is a low level. That is, when the gate potential of the N-type transistor is a high level, the first pole and the second pole are connected, and when the gate potential of the N-type transistor is a low level, the first pole and the second pole are disconnected. For P-type transistors, the on-level is a low level and the off-level is a high level. That is, when the gate potential of the P-type transistor is a low level, the first pole and the second pole are connected, and when the gate potential of the P-type transistor is a high level, the first pole and the second pole are disconnected.

[0115] In a specific implementation, the gate of each of the above-mentioned transistors serves as its control electrode, and, according to the signal of the gate of each transistor and its type, its first electrode can be used as the source and the second electrode as the drain, or its first electrode can be used as the drain and the second electrode as the source, without making any distinction here. In addition, the on-level and off-level in the embodiments of the present application are general terms, the on-level refers to any level that can turn on the transistor, and the off-level refers to any level that can turn off / shut down the transistor.

[0116] It should be noted that in the embodiments shown in the above figures, the resistor is represented by a single resistor, and the capacitor is represented by a single capacitor. In other embodiments, the resistor may be an integration of series, parallel or mixed resistors, and the capacitor may be an integration of series, parallel or mixed capacitors. The specific parameters of each device can be set according to actual needs, and this application does not limit this.

[0117] Based on the same inventive concept, the present application also provides an electronic device, including the power supply circuit provided by any of the above embodiments of the present application. The electronic device provided by the embodiment of the present application has the beneficial effects of the power supply circuit provided by the embodiment of the present application. For details, please refer to the specific description of the power supply circuit in the above embodiments, which will not be repeated in this embodiment.

[0118] Exemplarily, the electronic device provided in the embodiments of the present application may be a display device with a display function, for example, it may be a mobile phone, a wearable product, a computer, a television, a vehicle-mounted display device, or other display device with a display function, and the present application does not impose any specific restrictions on this.

[0119] For example, the electronic device provided in the embodiment of the present application may be a flexible display device with a display function, for example, an organic light-emitting diode (OLED) flexible display device.

[0120] According to the embodiments described above in the present application, these embodiments do not describe all the details in detail, nor do they limit the present application to the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and the modifications based on the present application. The present application is limited only by the claims and their full scope and equivalents.

Claims

1. A power supply circuit, characterized in that: include: A rectifier circuit connected to an AC bus, wherein the AC bus includes a first AC bus and a second AC bus, and a voltage on the first AC bus has a polarity opposite to that on the second AC bus; The rectifier circuit includes a bridge arm, which includes two transistors connected in series between a first AC bus and a second AC bus. In at least one of the bridge arms, the gate of the transistor connected to the first AC bus is connected to the second AC bus, and the gate of the transistor connected to the second AC bus is connected to the first AC bus.

2. The power supply circuit according to claim 1, characterized in that: The bridge arm comprises a first bridge arm and a second bridge arm; The first bridge arm includes a first transistor and a third transistor, and the second bridge arm includes a second transistor and a fourth transistor; The first electrode of the first transistor is connected to the first AC bus, the second electrode of the first transistor is connected to the first electrode of the third transistor, and the gate of the first transistor is connected to the second AC bus; The second electrode of the third transistor is connected to the second AC bus, and the gate of the third transistor is connected to the first AC bus; A first electrode of the fourth transistor is connected to the first AC bus, a second electrode of the fourth transistor is connected to the first electrode of the second transistor, and a gate of the fourth transistor is connected to the second AC bus; The second electrode of the second transistor is connected to the second AC bus, and the gate of the second transistor is connected to the first AC bus; The first transistor and the third transistor are N-type transistors, and the second transistor and the fourth transistor are P-type transistors; Preferably, the transistors in the power circuit are thin film transistors.

3. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes: A detection circuit is connected to the output end of the power supply circuit, and the detection circuit is used to detect the voltage output by the power supply circuit.

4. The power supply circuit according to claim 3, characterized in that: The detection circuit includes a first resistor, a second resistor, a third resistor and a fifth transistor; A first end of the first resistor is connected to the output end of the power supply circuit, a second end of the first resistor is connected to a first end of the second resistor, and a second end of the second resistor is connected to a ground end; The first electrode of the fifth transistor is connected to the first end of the first resistor, the second electrode of the fifth transistor is connected to the first end of the third resistor, the gate of the fifth transistor is connected to the second end of the first resistor, and the second end of the third resistor is connected to the ground terminal; The fifth transistor comprises a P-type transistor; Preferably, the first resistor, the second resistor and the third resistor have equal resistance values.

5. The power supply circuit according to any one of claims 1 to 3, characterized in that: The power supply circuit also includes: A limiting circuit, connected between the AC bus and the ground terminal, for limiting the voltage amplitude on the AC bus; Preferably, the amplitude limiting circuit is also electrically connected to a detection circuit in the power supply circuit, and the amplitude limiting circuit is turned on or off under the control of the detection circuit.

6. The power supply circuit according to claim 5, characterized in that: The amplitude limiting circuit includes a sixth transistor and a fourth resistor, wherein a first end of the fourth resistor is connected to the first AC bus, a second end of the fourth resistor is connected to a first electrode of the sixth transistor, a second electrode of the sixth transistor is connected to a ground terminal, and a gate of the sixth transistor is connected to a control signal transmitted by the detection circuit; And / or, the amplitude limiting circuit includes a seventh transistor and a fifth resistor, a first end of the fifth resistor is connected to the second AC bus, a second end of the fifth resistor is connected to a first electrode of the seventh transistor, a second electrode of the seventh transistor is connected to a ground terminal, and a gate of the seventh transistor is connected to a control signal transmitted by the detection circuit; Preferably, the gate of the sixth transistor and the gate of the seventh transistor are connected to a detection point of a detection circuit; Preferably, the detection point is located in a transmission path from the fifth transistor of the detection circuit to the ground terminal; Preferably, the fourth resistor and the fifth resistor have the same resistance value.

7. The power supply circuit according to claim 3, characterized in that: The power supply circuit also includes a limiting circuit connected between the AC bus and the ground terminal, and used to limit the voltage amplitude on the AC bus; The resistance value of the resistor in the detection circuit is greater than the resistance value of the resistor in the amplitude limiting circuit; Preferably, the resistance value of the resistor in the detection circuit is greater than or equal to 100K ohms; Preferably, the resistance value of the resistor in the amplitude limiting circuit is less than or equal to 2K ohms.

8. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes: A current limiting module, connected between the output end of the rectifier circuit and the output end of the power supply circuit; Preferably, the current limiting module includes a sixth resistor.

9. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes: A filter module, the filter module is connected to the output end of the power supply circuit; Preferably, the filtering module comprises a capacitor, one end of which is connected to the second AC bus, and the other end of which is connected to the output end of the rectifier circuit.

10. An electronic device, characterized in that: The invention comprises a power supply circuit according to any one of claims 1 to 9.

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