Power control circuit, power circuit control method, and electronic device

Abstract

Embodiments of the present application disclose a power control circuit, a power circuit control method, and an electronic device, belonging to the field of circuit technologies. The power control circuit is used to supply power to a load and includes: a power supply loop, a constant current loop, a constant voltage loop, and a control circuit; the power supply loop is respectively coupled to the constant current loop and the constant voltage loop and is used to provide energy for the constant current loop and the constant voltage loop; the first output terminal of the control circuit is connected to the power supply loop and is used to control the power supply loop to conduct and turn off periodically; the second output terminal of the control circuit is connected to the constant current loop and is used to control the constant current loop to conduct to provide a constant current for the load when a current demand signal is detected and the power supply loop is detected to be disconnected in each period; the third output terminal of the control circuit is connected to the constant voltage loop and is used to control the constant voltage loop to conduct to provide a constant voltage for the load when a voltage demand signal is detected and the power supply loop is detected to be disconnected in each period.

Description

Technical Field

[0001] This application relates to the field of circuits, and particularly to a power control circuit, a power circuit control method, and an electronic device. Background Art

[0002] A power supply is a device that provides power to an electronic device, also known as a power supply unit. It can convert alternating current into stable direct current. The stability of the current and voltage provided by the power supply directly affects the working performance and service life of the electronic device.

[0003] Traditional flyback power control circuits operate in a deep continuous state, resulting in severe voltage and current oscillations in the entire circuit, causing overheating and overstress of power devices such as transformers, MOS transistors, and diodes, thus reducing the power supply life. Summary of the Invention

[0004] Embodiments of this application provide a power control circuit, a power circuit control method, and an electronic device that can operate in a discontinuous state to solve the problem of overstress of power devices in the circuit.

[0005] The technical solutions are as follows:

[0006] In a first aspect, embodiments of this application provide a power control circuit for supplying power to a load. The circuit includes: a power supply loop, a constant current loop, a constant voltage loop, and a control circuit;

[0007] The power supply loop is coupled to the constant current loop and the constant voltage loop respectively, and is used to provide energy for the constant current loop and the constant voltage loop;

[0008] The first output terminal of the control circuit is connected to the power supply loop, and is used to control the power supply loop to conduct and turn off periodically;

[0009] The second output terminal of the control circuit is connected to the constant current loop, and is used to control the constant current loop to conduct when a current demand signal is detected and the power supply loop is detected to be disconnected in each cycle, so as to provide a constant current for the load;

[0010] The third output terminal of the control circuit is connected to the constant voltage loop, and is used to control the constant voltage loop to conduct when a voltage demand signal is detected and the power supply loop is detected to be disconnected in each cycle, so as to provide a constant voltage for the load.

[0011] Optionally, the constant current loop includes: the first secondary winding of a transformer, a first switching transistor, and a first energy storage capacitor;

[0012] The first output terminal of the first secondary winding is connected to the second output terminal of the first secondary winding via the first energy storage capacitor, the input terminal of the first switching tube, and the output terminal of the first switching tube; the first energy storage capacitor is connected in parallel with the load to provide a constant current for the load;

[0013] The second output terminal of the control circuit is connected to the enable terminal of the first switching tube to control the conduction or cutoff of the first switching tube, and thus control the conduction or disconnection of the constant current loop.

[0014] Optionally, the constant voltage loop includes: the second secondary winding of the transformer, the second switching tube, and the second energy storage capacitor;

[0015] The first output terminal of the second secondary winding is connected to the second output terminal of the second secondary winding via the input terminal of the second switching tube, the output terminal of the second switching tube, and the second energy storage capacitor; the second energy storage capacitor is connected in parallel with the load to provide a constant voltage for the load;

[0016] The third output terminal of the control circuit is connected to the enable terminal of the second switching tube to control the conduction or cutoff of the second switching tube, and thus control the conduction or disconnection of the constant voltage loop.

[0017] Optionally, the power supply loop includes: the primary winding of the transformer, the third switching tube, and the third energy storage capacitor;

[0018] The first output terminal of the primary winding is connected to the second output terminal of the primary winding via the third energy storage capacitor, the input terminal of the third switching tube, and the output terminal of the third switching tube;

[0019] The first output terminal of the control circuit is connected to the enable terminal of the third switching tube to control the conduction or cutoff of the third switching tube, and thus control the conduction or disconnection of the power supply loop.

[0020] Optionally, the first switching tube is a constant current MOS tube; the enable terminal of the first switching tube is the gate of the constant current MOS tube; the input terminal of the first switching tube is the source of the constant current MOS tube; the output terminal of the first switching tube is the drain of the constant current MOS tube;

[0021] The second switching tube is a constant voltage MOS tube; the enable terminal of the second switching tube is the gate of the constant voltage MOS tube; the input terminal of the second switching tube is the drain of the constant voltage MOS tube; the output terminal of the second switching tube is the source of the constant voltage MOS tube;

[0022] The third switching transistor is the primary MOS transistor; the enable terminal of the third switching transistor is the gate of the primary MOS transistor; the input terminal of the third switching transistor is the drain of the primary MOS transistor; the output terminal of the third switching transistor is the source of the primary MOS transistor.

[0023] Optionally, the control loop is specifically configured to:

[0024] At the beginning of each cycle, control the primary MOS to conduct, and at the same time control the constant current MOS transistor or the constant voltage MOS transistor to turn off;

[0025] After the conduction time of the primary MOS ends, control the primary MOS transistor to turn off, and at the same time control the constant current MOS transistor or the constant voltage MOS transistor to conduct;

[0026] Optionally, the constant current loop further includes: a first sampling component for sampling the current of the constant current loop;

[0027] The constant voltage loop further includes: a second sampling component for sampling the voltage of the constant voltage loop;

[0028] The control loop is specifically configured to determine whether the conduction time of the primary MOS ends according to the sampled current or the sampled voltage.

[0029] In a second aspect, an embodiment of the present application provides an electronic device, including: the power control circuit as described in the first aspect and a load;

[0030] The power control circuit is connected to the load and provides a constant current and / or a constant voltage to the load.

[0031] In a third aspect, an embodiment of the present application provides a power circuit control method, which is applied to the power control circuit as described in the first aspect. The method includes:

[0032] Detect the arrival of the start moment of the cycle, control the power supply loop to conduct, and at the same time control the constant current loop or the constant voltage loop to disconnect;

[0033] After detecting that the conduction time of the power supply loop ends, control the power supply loop to disconnect, and at the same time control the constant current loop or the constant voltage loop to conduct.

[0034] Optionally, the method further includes:

[0035] Sample the current of the constant current loop or sample the voltage of the constant voltage loop;

[0036] Determine whether the conduction time of the power supply loop ends according to the sampled current or the sampled voltage.

[0037] Fourthly, an embodiment of the present application provides a computer storage medium storing multiple instructions adapted to be loaded and executed by a processor to perform the above method steps.

[0038] In an embodiment of the present application, a power control circuit, a power circuit control method, and an electronic device are provided. The power control circuit provided by the embodiment of the present application is used to supply power to a load and includes: a power supply loop, a constant current loop, a constant voltage loop, and a control circuit; the power supply loop is respectively coupled to the constant current loop and the constant voltage loop and is used to provide energy for the constant current loop and the constant voltage loop; the first output terminal of the control circuit is connected to the power supply loop and is used to control the power supply loop to be periodically turned on and off; the second output terminal of the control circuit is connected to the constant current loop and is used to control the constant current loop to be turned on when a current demand signal is detected and the power supply loop is detected to be disconnected in each cycle, so as to provide a constant current for the load; the third output terminal of the control circuit is connected to the constant voltage loop and is used to control the constant voltage loop to be turned on when a voltage demand signal is detected and the power supply loop is detected to be disconnected in each cycle, so as to provide a constant voltage for the load. In the power control circuit provided by the embodiment of the present application, within one cycle, after the power supply loop is turned on once, one of the constant current circuit or the constant voltage circuit is turned on once, enabling the circuit to work in an intermittent state with complete discharge after one charge, and solving the problem of stress overshoot of power devices in the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 It is a circuit diagram of a traditional power drive circuit provided by the present application;

[0041] Figure 2 It is a schematic diagram of an application scenario provided by the present application;

[0042] Figure 3 It is a circuit diagram of a power control circuit provided by an embodiment of the present application;

[0043] Figure 4 It is a circuit diagram of another power control circuit provided by an embodiment of the present application;

[0044] Figure 5 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application;

[0045] Figure 6 The flowchart of a power circuit control method provided by an embodiment of the present application. Specific embodiments

[0046] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0047] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0048] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0049] In the description of the present application, it should be understood that terms such as "first", "second", "third", etc. are only used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. In addition, in the description of the present application, unless otherwise stated, "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0050] Figure 1 The circuit diagram of a traditional flyback power control circuit provided for the present application. As Figure 1 shown, the traditional flyback power control circuit includes a power drive loop 101, a constant current drive loop 102, and a constant voltage drive loop 103. Specifically, the power drive loop 101 includes a MOS transistor Q1 and a capacitor C1, and is coupled to the constant current drive loop 102 and the constant voltage drive loop 103 through the primary winding of the flyback transformer T; the constant current drive loop 102 includes a MOS transistor Q2, a capacitor C2, and a diode D1, and is coupled to the power drive loop 101 through the secondary winding of the flyback transformer T; the constant voltage drive loop 103 includes a capacitor C3 and a diode D2, and is coupled to the power drive loop 101 through the secondary winding of the flyback transformer T. The specific connection relationships of each device are as Figure 1as shown

[0051] When the primary winding of the flyback transformer T is excited, the secondary winding does not provide power output to the load, but only after the excitation of the primary winding is turned off, the secondary winding provides power output to the load.

[0052] In the working state, the working process of this circuit is as follows: when the MOS transistor Q1 is turned on and the diode D1 is turned off, the primary winding of the flyback transformer T is excited to store energy; when the MOS transistor Q1 is turned off, the diode D1 is turned on, and the MOS transistor Q2 is turned on, the excitation of the primary winding of the flyback transformer T is turned off, the secondary winding releases energy, the constant current drive circuit is turned on to provide a constant current for the load, the diode D2 is turned off, and the constant voltage circuit is disconnected; when the MOS transistor Q2 is turned off, the constant current drive circuit is disconnected, the diode D2 is turned on, the secondary winding continues to release energy, the constant voltage drive circuit is turned on to provide a constant voltage for the load.

[0053] That is, within one cycle, the transformer stores energy once, and the constant current drive circuit and the constant voltage drive circuit are alternately turned on to release energy. Therefore, during the conduction of the constant current drive circuit, the energy of the transformer must not be completely released, resulting in the circuit working in a deep continuous state, with severe voltage and current oscillations in the entire circuit, causing the temperature rise and stress of power devices such as transformers, MOS transistors, and diodes to exceed the standard, thus shortening the service life of the power supply.

[0054] Based on the defects of traditional power supplies, the embodiments of the present application provide a new power supply control circuit, an electronic device applying this power supply control circuit, and a power supply circuit control method applicable to this power supply control circuit. It is expected to change the circuit structure and circuit control method, change the circuit working timing, make the circuit work in a discontinuous state, reduce the voltage and current oscillations in the circuit, and avoid overheating of power devices.

[0055] Figure 2 This is a schematic diagram of an application scenario provided by the present application. As Figure 2 shown, the display device 201 is connected to the mains power through the power adapter 202. The power adapter 202 uses the power supply control circuit provided by the present application. Based on this circuit, the mains power is converted to provide a constant voltage and / or a constant current for the display device 201 to enable the display device 201 to work properly.

[0056] The specific implementation method can refer to the following embodiments.

[0057] Figure 3Schematic diagram of the circuit structure of a power control circuit provided by an embodiment of the present application, used to supply power to a load 300. The circuit includes: a power supply loop 301, a constant current loop 302, a constant voltage loop 303, and a control circuit 304; the power supply loop 301 is respectively coupled and connected to the constant current loop 302 and the constant voltage loop 303, and is used to provide energy for the constant current loop 302 and the constant voltage loop 303; the first output terminal of the control circuit 304 is connected to the power supply loop 301, and is used to control the power supply loop 301 to conduct and turn off periodically; the second output terminal of the control circuit 304 is connected to the constant current loop 302, and is used to control the constant current loop 302 to conduct when a current demand signal is detected and the power supply loop 301 is detected to be disconnected in each cycle, so as to provide a constant current for the load; the third output terminal of the control circuit 304 is connected to the constant voltage loop 303, and is used to control the constant voltage loop 303 to conduct when a voltage demand signal is detected and the power supply loop 301 is detected to be disconnected in each cycle, so as to provide a constant voltage for the load 300.

[0058] The control circuit 304 controls the power supply loop 301 to conduct and turn off periodically through the first output terminal. That is, in each cycle, the power supply loop 301 has a conduction time and a turn-off time. When the power supply loop 301 conducts, energy is stored, and the constant current loop 302 and the constant voltage loop 303 are disconnected; when the power supply loop 301 is disconnected, according to the different detected demand signals, one of the constant current loop 302 and the constant voltage loop 303 is selectively conducted, and the power supply loop 301 provides energy for the conducted loop to provide the required constant voltage or constant current for the load 300. That is to say, within one cycle, the power supply loop stores energy once, and then releases energy once through the constant voltage loop or the constant current loop. Based on this circuit, only by adjusting the conduction time and turn-off time of the power supply loop 301, the energy stored within one cycle can be completely released, and it works in an intermittent state, thus avoiding problems such as overheating of power devices and overstress caused by severe voltage and current oscillations in the circuit.

[0059] Figure 4 Another circuit diagram of a power control circuit provided by an embodiment of the present application. As Figure 4 shown, the specific structure of the constant current loop 302 may include: the first secondary winding of the transformer T4, the first switching tube Q41, and the first energy storage capacitor C41. Among them, the first output terminal of the first secondary winding is connected to the second output terminal of the first secondary winding via the first energy storage capacitor C41, the input terminal of the first switching tube Q41, and the output terminal of the first switching tube Q41; the first energy storage capacitor C41 is connected in parallel with the load 300 to provide a constant current for the load 300; the second output terminal of the control circuit is connected to the enable terminal of the first switching tube Q41, and is used to control the conduction or cut-off of the first switching tube Q41, and further control the conduction or disconnection of the constant current loop.

[0060] The specific structure of the constant voltage circuit 303 may include: the second secondary winding of the transformer T4, the second switching transistor Q42, and the second energy storage capacitor C42. Among them, the first output terminal of the second secondary winding is connected to the second output terminal of the second secondary winding via the input terminal of the second switching transistor Q42, the output terminal of the second switching transistor Q42, and the second energy storage capacitor C42; the second energy storage capacitor C42 is connected in parallel with the load 300 to provide a constant voltage for the load 300; the third output terminal of the control circuit is connected to the enable terminal of the second switching transistor Q42 to control the conduction or cut-off of the second switching transistor Q42, and further control the conduction or disconnection of the constant voltage circuit.

[0061] The specific structure of the power supply circuit 301 may include: the primary winding of the transformer T4, the third switching transistor Q43, and the third energy storage capacitor C43; the first output terminal of the primary winding is connected to the second output terminal of the primary winding via the third energy storage capacitor C43, the input terminal of the third switching transistor Q43, and the output terminal of the third switching transistor Q43; the first output terminal of the control circuit is connected to the enable terminal of the third switching transistor Q43 to control the conduction or cut-off of the third switching transistor Q43, and further control the conduction or disconnection of the power supply circuit.

[0062] By outputting a PWM control signal, the control circuit can control the conduction and cut-off of the switching transistors in each circuit, and further control the on and off of each circuit.

[0063] In some embodiments, the above-mentioned first switching transistor Q41 may be a constant current MOS transistor; the enable terminal of the first switching transistor Q41 is the gate of the constant current MOS transistor; the input terminal of the first switching transistor Q41 is the source of the constant current MOS transistor; the output terminal of the first switching transistor Q41 is the drain of the constant current MOS transistor. The above-mentioned second switching transistor Q42 is a constant voltage MOS transistor; the enable terminal of the second switching transistor Q42 is the gate of the constant voltage MOS transistor; the input terminal of the second switching transistor Q42 is the drain of the constant voltage MOS transistor; the output terminal of the second switching transistor Q42 is the source of the constant voltage MOS transistor. The above-mentioned third switching transistor Q43 is a primary side MOS transistor; the enable terminal of the third switching transistor Q43 is the gate of the primary side MOS transistor; the input terminal of the third switching transistor Q43 is the drain of the primary side MOS transistor; the output terminal of the third switching transistor Q43 is the source of the primary side MOS transistor.

[0064] It should be noted that the above-mentioned first switching transistor Q41, second switching transistor Q42, and third switching transistor Q43 can all be MOS transistors. Here, they are distinguished as "constant current MOS transistor", "constant voltage MOS transistor", and "primary side MOS transistor" according to the functions of the circuits where they are located, and this does not limit the models of the MOS transistors.

[0065] Based on the above embodiments, the control loop is specifically configured to: at the beginning of each cycle, control the primary MOS to conduct, and at the same time control the constant-current MOS transistor or the constant-voltage MOS transistor to turn off; after the conduction time of the primary MOS ends, control the primary MOS transistor to turn off, and at the same time control the constant-current MOS transistor or the constant-voltage MOS transistor to conduct.

[0066] In some embodiments, based on the designed circuit structure, the duty cycle of the primary MOS transistor can be calculated through simulation tests, and then the conduction time of the primary MOS transistor can be preset in advance.

[0067] In some other embodiments, a feedback loop can also be added to the circuit, and the controller adjusts the duty cycle of the primary MOS transistor.

[0068] Specifically, a sampling circuit can be added to sample the current of the constant-current loop or the voltage of the constant-voltage loop. The sampled current value or the sampled voltage value is compared with a preset reference value to determine whether the sampled current value reaches the desired constant current or whether the sampled voltage value reaches the desired constant voltage value; when the sampled current value does not reach the desired constant current or the sampled voltage value does not reach the desired constant voltage, the comparison result can be fed back to the controller, and the controller adjusts the duty cycle of the primary MOS transistor according to the comparison result, that is, adjusts the conduction time of the primary MOS transistor, so as to adjust the current of the constant-current loop or the voltage of the constant-voltage loop until the sampled current value reaches the desired constant current or the sampled voltage value reaches the desired constant voltage value. After that, the circuit enters a stable state and will continuously and stably output a constant current and / or a constant voltage.

[0069] In some embodiments, the sampling circuit can be implemented by adding a sampling component in the constant-current loop or the constant-voltage loop. Specifically, the above constant-current loop may further include: a first sampling component for sampling the current of the constant-current loop; the constant-voltage loop may further include: a second sampling component for sampling the voltage of the constant-voltage loop. Correspondingly, the controller is specifically configured to judge whether the conduction time of the primary MOS ends according to the sampled current or the sampled voltage.

[0070] Among them, the first sampling component and the second sampling component may specifically be resistors. The sampling resistor is connected in series in the constant-current loop, and the sampled current value can be calculated by combining the voltage across the sampling resistor and the resistance value; the sampling resistor is connected in parallel in the constant-voltage loop, and the sampled voltage value can be directly obtained by sampling the voltage across the resistor.

[0071] In a specific embodiment, the primary MOS transistor conducts at a fixed frequency. In each cycle, the working process of the circuit is as follows:

[0072] At the beginning of a cycle, the control circuit controls the primary MOS transistor to conduct. At this time, the constant-current MOS transistor is turned off, and the constant-voltage MOS transistor is turned off. Both the constant-current loop and the constant-voltage loop are disconnected, and the primary winding stores energy.

[0073] When the control circuit detects that the conduction time of the primary MOS transistor ends, it controls the primary MOS transistor to turn off. Since the inductor current cannot change suddenly, in order to maintain the current direction of the primary transformer unchanged, the voltage difference between the upper and lower ends of the primary winding reverses, and the voltage of the secondary winding also reverses. After detecting the voltage change of the secondary winding, it is determined that the primary MOS transistor is indeed turned off. If the constant-current demand signal of the system is detected at this time, the constant-current MOS transistor is driven to conduct, and the energy stored in the primary winding is released. In the stable state, a constant current is output through the constant-current loop, and at the same time, the capacitor in the constant-current loop stores energy until the end of the cycle and the next cycle begins.

[0074] At the beginning of a new cycle, the control circuit controls the primary MOS transistor to conduct, and the polarity of the primary winding changes again. At this time, the constant-voltage MOS transistor is still in the off state. After the control circuit detects the change in the polarity voltage of the secondary winding, it determines that the primary MOS transistor is indeed conducting, and then controls the constant-current MOS transistor to turn off. Both the constant-current loop and the constant-voltage loop are disconnected, and the primary winding stores energy; at this time, the capacitor in the constant-current loop releases energy to continue to output a constant current;

[0075] When the control circuit detects that the conduction time of the primary MOS transistor ends, it controls the primary MOS transistor to turn off. After detecting the voltage change of the secondary winding, it is determined that the primary MOS transistor is indeed turned off. If the constant-voltage demand signal of the system is detected at this time, the constant-voltage MOS transistor is driven to conduct, and the energy stored in the primary winding is released. In the stable state, a constant voltage is output through the constant-voltage loop, and at the same time, the capacitor in the constant-voltage loop stores energy until the end of the cycle and the next cycle begins.

[0076] The above embodiments are only one implementation method. In practical applications, for a certain type of electronic device, the constant-voltage or constant-current demand of the components therein should be stable. The constant-current demand signal and the voltage demand signal can be set at the initial stage of circuit design according to fixed requirements. For example, the constant-voltage loop conducts in one cycle when the primary MOS transistor conducts, and the constant-current loop conducts in the next cycle, and so on, that is, the constant-voltage MOS transistor and the constant-current MOS transistor are controlled to conduct alternately, and the cycle is twice the conduction cycle of the primary MOS.

[0077] Figure 5 As shown in the schematic structural diagram of an electronic device provided by an embodiment of the present application, Figure 5 as shown, the electronic device 500 may include: a power control circuit 501 and a load 502. The power control circuit 501 is connected to the load 502 to provide a constant current and / or a constant voltage for the load 502. Among them, the power control circuit 501 may adopt the structure in the above embodiment.

[0078] In a specific application, the power control circuit 501 can be applied in a power adapter, and the load 502 can be integrated in a device that needs to be powered (such as Figure 2 the display device in the above-mentioned embodiment), such as an LED, a backlight component, etc., to jointly form an electronic device 500.

[0079] For the structure and specific working process of the power control circuit in the electronic device provided in this embodiment, reference can be made to the description of the above-mentioned embodiment, and details are not repeated here.

[0080] Figure 6 FIG. 11 is a flowchart of a power circuit control method provided in an embodiment of the present application, which is applied to the power control circuit or the electronic device as described above. The method may specifically include:

[0081] S601. Detect the arrival of the start moment of the period, control the power circuit to conduct, and at the same time control the constant current circuit or the constant voltage circuit to disconnect.

[0082] S602. After detecting the end of the conduction time of the power circuit, control the power circuit to disconnect, and at the same time control the constant current circuit or the constant voltage circuit to conduct.

[0083] In some embodiments, the above control method may further include:

[0084] Sampling the current of the constant current circuit or sampling the voltage of the constant voltage circuit;

[0085] Judging whether the conduction time of the power circuit ends according to the sampled current or the sampled voltage.

[0086] For the specific implementation process of the power circuit control method provided in this embodiment, reference can be made to the description of the above-mentioned embodiment, and details are not repeated here.

[0087] When the above control method is integrated and executed in a control chip, an embodiment of the present application may further include a computer storage medium. The computer storage medium stores multiple instructions, and the instructions are adapted to be loaded and executed by a processor to perform the above method steps.

[0088] It should be noted that due to space limitations, the present application specification does not list all optional implementation manners. After reading the present application specification, those skilled in the art should be able to think that as long as the technical features do not conflict with each other, any combination of technical features can constitute an optional implementation manner. The non-conflicting technical features recorded in different embodiments can also be arbitrarily combined to form an optional implementation manner.

[0089] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0090] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of the flows and / or blocks in the flowchart and / or block diagram can also be implemented. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in one Figure 1 flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0091] These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured product including instruction means, and the instruction means implement the functions specified in one Figure 1 flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0092] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one Figure 1 flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0093] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and a memory.

[0094] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM), and / or non-volatile memory in the form of, for example, read-only memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

[0095] A computer-readable medium includes permanent and non-permanent, removable and non-removable media and can implement information storage by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media, such as modulated data signals and carrier waves.

[0096] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, commodity or device comprising the element.

[0097] The above are only embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A power supply control circuit, characterized in that: Used to supply power to the load, the circuit includes: a power supply circuit, a constant current circuit, a constant voltage circuit, and a control circuit; The power supply circuit is coupled to the constant current circuit and the constant voltage circuit respectively, and is used to provide energy to the constant current circuit and the constant voltage circuit; The first output terminal of the control circuit is connected to the power supply circuit, and is used to control the power supply circuit to be periodically turned on and off; The second output end of the control circuit is connected to the constant current loop, and is used to control the constant current loop to be turned on when a current demand signal is detected in each cycle and when it is detected that the power supply loop is disconnected, so as to provide a constant current to the load; The third output terminal of the control circuit is connected to the constant voltage loop, and is used to control the constant voltage loop to be turned on when a voltage demand signal is detected in each cycle and when it is detected that the power supply loop is disconnected, so as to provide a constant voltage to the load; The constant current circuit includes a first switch tube, which is a constant current MOS tube; the constant voltage circuit includes a second switch tube, which is a constant voltage MOS tube; the power supply circuit includes a third switch tube, which is a primary side MOS tube; The control circuit is specifically used for: At the beginning of each cycle, the primary MOS is controlled to be turned on, and the constant current MOS transistor or the constant voltage MOS transistor is controlled to be turned off; after the primary MOS conduction time ends, the primary MOS transistor is controlled to be turned off, and the constant current MOS transistor or the constant voltage MOS transistor is controlled to be turned on; wherein the constant current MOS transistor and the constant voltage MOS transistor are alternately turned on, and the cycle of the constant current MOS transistor and the constant voltage MOS transistor is twice the conduction cycle of the primary MOS transistor; In which, the constant current loop also includes: a first sampling element for sampling the current of the constant current loop; the constant voltage loop also includes: a second sampling element for sampling the voltage of the constant voltage loop; the control circuit is specifically used to determine whether the primary side MOS conduction time has ended based on the sampled current or the sampled voltage.

2. The circuit according to claim 1, wherein: The constant current circuit further comprises: a first secondary winding of a transformer and a first energy storage capacitor; The first output end of the first secondary winding is connected to the second output end of the first secondary winding via the first energy storage capacitor, the input end of the first switching tube, and the output end of the first switching tube; the first energy storage capacitor is connected in parallel with the load to provide a constant current to the load; The second output end of the control circuit is connected to the enable end of the first switch tube, and is used to control the conduction or cutoff of the first switch tube, thereby controlling the conduction or cutoff of the constant current loop.

3. The circuit according to claim 2, characterized in that The constant voltage circuit further comprises: a second secondary winding of the transformer and a second energy storage capacitor; The first output end of the second secondary winding is connected to the second output end of the second secondary winding via the input end of the second switching tube, the output end of the second switching tube and the second energy storage capacitor; the second energy storage capacitor is connected in parallel with the load to provide a constant voltage for the load; The third output terminal of the control circuit is connected to the enable terminal of the second switch tube, and is used to control the conduction or cutoff of the second switch tube, thereby controlling the conduction or cutoff of the constant voltage loop.

4. The circuit according to claim 3, characterized in that The power supply circuit also includes: a primary winding of a transformer and a third energy storage capacitor; The first output end of the primary winding is connected to the second output end of the primary winding via the third energy storage capacitor, the input end of the third switch tube, and the output end of the third switch tube; The first output terminal of the control circuit is connected to the enable terminal of the third switch tube, and is used to control the conduction or cut-off of the third switch tube, thereby controlling the conduction or cut-off of the power supply circuit.

5. The circuit according to claim 4, characterized in that The enable terminal of the first switch tube is the gate of the constant current MOS tube; the input terminal of the first switch tube is the source of the constant current MOS tube; and the output terminal of the first switch tube is the drain of the constant current MOS tube; The enabling terminal of the second switch tube is the gate of the constant voltage MOS tube; The input end of the second switch tube is the drain of the constant voltage MOS tube; the output end of the second switch tube is the source of the constant voltage MOS tube; The enable end of the third switch tube is the gate of the primary MOS tube; the input end of the third switch tube is the drain of the primary MOS tube; and the output end of the third switch tube is the source of the primary MOS tube.

6. An electronic device, characterized in that: include: The power control circuit and load according to any one of claims 1 to 5; The power control circuit is connected to the load to provide a constant current and / or a constant voltage to the load.

7. A power circuit control method, characterized in that: Applied to the power supply control circuit according to any one of claims 1 to 5, the method comprises: Detect when the cycle starts, control the power circuit to be turned on, and at the same time control the constant current circuit or constant voltage circuit to be turned off; After detecting that the power circuit conduction time has ended, the power circuit is controlled to be disconnected, and at the same time the constant current circuit or constant voltage circuit is controlled to be turned on; Sampling the current of the constant current loop or sampling the voltage of the constant voltage loop; Whether the power circuit conduction time is completed is determined based on the sampled current or the sampled voltage.

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