Electronic equipment and power supply circuit thereof

Abstract

The utility model discloses electronic equipment and a power supply circuit thereof, which are used for supplying power to a chip. The power supply circuit comprises a first power supply circuit and a second power supply circuit, one end of the first power supply circuit is connected with one end of the second power supply circuit, the other end of the first power supply circuit and the other end of the second power supply circuit are connected with the first end of a chip, and the first power supply circuit comprises a first switch; the first end of the control circuit is connected with one end of the first power supply circuit, and the second end of the control circuit is connected with the control end of the first switch; the energy storage circuit is connected between the first end of the chip and the second end of the chip; one end of the first power supply circuit and one end of the second power supply circuit receive voltage; the control circuit controls the first switch to be switched on or switched off based on voltage, so that the first power supply circuit or the second power supply circuit supplies power to the energy storage circuit; the first voltage is input into the first power supply circuit for power supply, and the second voltage is input into the second power supply circuit for power supply.

Description

Technical Field

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

[0002] With the development of science and technology, power supply circuits are increasingly widely used. Existing power supply circuits usually use a starting resistor to charge a capacitor to start the power supply circuit.

[0003] However, the power supply circuit cannot be applied to low voltage and high voltage at the same time. For example, if the input voltage is low, a high resistance value of the starting resistor will result in a long starting time; if the input voltage is high, a low resistance value of the starting resistor will result in excessive power consumption. Utility Model Content

[0004] In order to solve the above problems, the present application provides a power supply circuit, which includes:

[0005] a first power supply circuit and a second power supply circuit, wherein one end of the first power supply circuit is connected to one end of the second power supply circuit, and the other end of the first power supply circuit and the other end of the second power supply circuit are connected to the first end of the chip, wherein the first power supply circuit comprises a first switch;

[0006] a control circuit, wherein a first end of the control circuit is connected to one end of the first power supply circuit, and a second end of the control circuit is connected to a control end of the first switch;

[0007] A tank circuit connected between the first end of the chip and the second end of the chip;

[0008] One end of the first power supply circuit and one end of the second power supply circuit receive a first voltage, the control circuit is used to control the first switch to be turned on based on the first voltage, and the first power supply circuit is used to supply power to the energy storage circuit;

[0009] One end of the first power supply circuit and one end of the second power supply circuit receive a second voltage, the control circuit is used to control the first switch to be disconnected based on the second voltage, the second power supply circuit is used to power the energy storage circuit, and the second voltage is greater than the first voltage.

[0010] The power supply circuit also includes a winding assembly, one end of which is respectively connected to the first end of the chip and the third end of the control circuit, and the other end of the winding assembly is connected to the second end of the chip; the winding assembly is used to charge the energy storage circuit, and the control circuit is used to control the first switch to be disconnected based on the third voltage of the winding assembly, and the first power supply circuit stops charging the energy storage circuit.

[0011] The control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor and a switch circuit, one end of the first resistor and one end of the third resistor are connected to one end of the first power supply circuit, the other end of the first resistor is respectively connected to the control end of the first switch, one end of the second resistor, one end of the first capacitor and the output end of the switch circuit, the other end of the third resistor is respectively connected to the input end of the switch circuit and one end of the fourth resistor, and the other end of the first capacitor, the other end of the second resistor and the other end of the fourth resistor are all grounded.

[0012] The switching circuit includes a first voltage regulator tube, a second switch and a second voltage regulator tube, the cathode of the first voltage regulator tube is connected to the other end of the third resistor, the anode of the first voltage regulator tube is connected to the first end of the second switch, the second end of the second switch is connected to the other end of the first resistor, the anode of the second voltage regulator tube is connected to the third end of the second switch, the cathode of the second voltage regulator tube is connected to the second end of the second switch, and the third end of the second switch is grounded.

[0013] The switching circuit includes a first voltage regulator tube, a second switch and a second voltage regulator tube, wherein the first end of the second switch is connected to the other end of the third resistor, the second end of the second switch is connected to the other end of the first resistor, the third end of the second switch is grounded through the first voltage regulator tube, the positive electrode of the second voltage regulator tube is connected to the third end of the second switch, and the negative electrode of the second voltage regulator tube is connected to the second end of the second switch.

[0014] The control circuit also includes a second capacitor, a fifth resistor and a first diode, the anode of the first diode is connected to one end of the winding assembly, the cathode of the first diode is respectively connected to the other end of the third resistor and one end of the second capacitor through the fifth resistor, and the other end of the second capacitor is grounded.

[0015] The power supply circuit further includes a second diode, an anode of the second diode is connected to one end of the winding assembly, and a cathode of the second diode is connected to the first end of the chip.

[0016] The energy storage circuit includes a third capacitor, the first power supply circuit also includes a sixth resistor, one end of the sixth resistor serves as one end of the first power supply circuit, the other end of the sixth resistor is connected to the first end of the first switch, and the second end of the first switch is connected to the first end of the chip;

[0017] The second power supply circuit further includes a seventh resistor, one end of the seventh resistor is connected to one end of the sixth resistor, and the other end of the seventh resistor is connected to the first end of the chip.

[0018] The first power supply circuit further includes a third diode, and the second end of the first switch is connected to the first end of the chip through the third diode;

[0019] The second power supply circuit further includes a fourth diode, and the other end of the seventh resistor is connected to the first end of the chip through the fourth diode.

[0020] In order to solve the above problems, the present application provides an electronic device, comprising the above power supply circuit, wherein the power supply circuit is connected to the chip to supply power to the chip.

[0021] Beneficial effects of the present application: Different from the prior art, the power supply circuit includes: a first power supply circuit and a second power supply circuit, one end of the first power supply circuit is connected to one end of the second power supply circuit, the other end of the first power supply circuit and the other end of the second power supply circuit are connected to the first end of the chip, wherein the first power supply circuit includes a first switch; a control circuit, the first end of the control circuit is connected to one end of the first power supply circuit, and the second end of the control circuit is connected to the control end of the first switch; an energy storage circuit is connected between the first end of the chip and the second end of the chip; one end of the first power supply circuit and one end of the second power supply circuit receive voltage. The control circuit controls the first switch to be turned on or off based on the voltage, so that the first power supply circuit or the second power supply circuit supplies power to the energy storage circuit; the first voltage is input to the first power supply circuit for power supply, and the second voltage is input to the second power supply circuit for power supply, thereby reducing power consumption and startup time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0023] Figure 1 is a schematic diagram of a framework of an embodiment of a power supply circuit of the present application;

[0024] Figure 2 is a schematic diagram of a framework of another embodiment of the power supply circuit of the present application;

[0025] Figure 3 yes Figure 2 A circuit diagram of an embodiment of a power supply circuit;

[0026] Figure 4 yes Figure 2 A circuit diagram of another embodiment of a power supply circuit. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] See also Figure 1 , Figure 3 As shown, Figure 1 is a schematic diagram of a framework of an embodiment of a power supply circuit of the present application; Figure 3 yes Figure 2 A circuit diagram of an embodiment of a power supply circuit in FIG. 1 ; the power supply circuit of this embodiment is applied to chip 2 , and the power supply circuit is used to supply power to chip 2 , and chip 2 includes but is not limited to an IC chip.

[0030] The power supply circuit includes a first power supply circuit 11 , a second power supply circuit 12 , a control circuit 13 , and an energy storage circuit 14 .

[0031] One end of the first power supply circuit 11 is connected to one end of the second power supply circuit 12, and one end of the first power supply circuit 11 and one end of the second power supply circuit 12 receive input voltage Vin, so that the first power supply circuit 11 receives the input voltage Vin, and the second power supply circuit 12 receives the input voltage Vin.

[0032] The other end of the first power supply circuit 11 and the other end of the second power supply circuit 12 are connected to the first end of the chip 2 , and the first power supply circuit 11 and the second power supply circuit 12 supply power to the chip 2 through the first end of the chip 2 .

[0033] The first end of the control circuit 13 is connected to one end of the first power supply circuit 11 , that is, one end of the first power supply circuit 11 is simultaneously connected to the first end of the control circuit 13 and one end of the second power supply circuit 12 , and the control circuit 13 receives the input voltage Vin through the first end of the control circuit 13 .

[0034] The first power supply circuit 11 includes a first switch 111, and the second end of the control circuit 13 is connected to the control end of the first switch 111. The control circuit 13 is used to output a first level or a second level to the first switch 111, wherein the first level is a high level and the second level may be a low level. In other embodiments, the first level is a low level and the second level may be a high level.

[0035] The control circuit 13 controls the on / off of the first power supply circuit 11 by controlling the first switch 111 to be turned on or off. For example, the control circuit 13 outputs a first level to the first switch 111, that is, the control end of the first switch 111 is at a high level, the first switch 111 is turned on, and the first power supply circuit 11 is controlled to be connected to the chip 2.

[0036] The control circuit 13 outputs a second level to the first switch 111 , that is, the control terminal of the first switch 111 is at a low level, and the first switch 111 is disconnected, thereby controlling the first power supply circuit 11 to disconnect from the chip 2 .

[0037] The energy storage circuit 14 is connected between the first end of the chip 2 and the second end of the chip 2; that is, the energy storage circuit 14 is connected to the chip 2 through the first end and the second end of the chip 2; the first power supply circuit 11 or the second power supply circuit 12 is connected to the chip 2 through the first end of the chip 2, that is, the first power supply circuit 11 or the second power supply circuit 12 supplies power to the chip 2 through the first end of the chip 2 and also supplies power to the energy storage circuit 14.

[0038] The input voltage Vin may be a first voltage or a second voltage, and the second voltage is greater than the first voltage; wherein the first voltage is a low voltage, and the second voltage may be a high voltage.

[0039] One end of the first power supply circuit 11 and one end of the second power supply circuit 12 receive the first voltage, and the control circuit 13 outputs a high level to the control end of the first switch 111 based on the first voltage, controls the first switch 111 to be turned on, and then controls the first power supply circuit 11 to be connected to the energy storage circuit 14; at this time, the second power supply circuit 12 and the energy storage circuit 14 are not connected, and the first power supply circuit 11 is used to supply power to the energy storage circuit 14. The power supply circuit receives the first voltage, that is, the power supply circuit receives a low voltage, and supplies power to the energy storage circuit 14 through the first power supply circuit 11. The first power supply circuit 11 has a low resistance value, which reduces the startup time of the energy storage circuit 14.

[0040] One end of the first power supply circuit 11 and one end of the second power supply circuit 12 receive the second voltage, and the control circuit 13 is used to output a low level to the control end of the first switch 111 based on the second voltage, control the first switch 111 to be disconnected, and then control the first power supply circuit 11 and the energy storage circuit to be disconnected; at this time, the second power supply circuit 12 and the energy storage circuit 14 are connected, and the second power supply circuit 12 is used to supply power to the energy storage circuit 14. The power supply circuit receives the second voltage, that is, the power supply circuit receives a high voltage, and supplies power to the energy storage circuit 14 through the second power supply circuit 12. The second power supply circuit 12 has a high resistance value, which reduces the power consumption of the power supply circuit.

[0041] The power supply circuit of this embodiment includes a first power supply circuit 11, a second power supply circuit 12, a control circuit 13 and an energy storage circuit 14; wherein the first power supply circuit 11 includes a first switch 111. The control circuit 13 controls the on or off of the first switch 111 based on the magnitude of the input voltage Vin, thereby controlling the on or off of the first power supply circuit 11. The on or off of the first power supply circuit 11 is controlled by the control circuit 13; the first power supply circuit 11 supplies power when the first voltage is input, and the second power supply circuit 12 supplies power when the second voltage is input, thereby reducing power consumption and startup time.

[0042] Please combine Figure 2-3 As shown, Figure 2 is a schematic diagram of a framework of another embodiment of the power supply circuit of the present application; Figure 3 yes Figure 2 A circuit diagram of an embodiment of a power supply circuit.

[0043] The power supply circuit of this embodiment also includes a winding assembly 15, one end of which is connected to the first end of the chip 2 and the third end of the control circuit 13, respectively, and the other end of the winding assembly 15 is connected to the second end of the chip 2. The winding assembly 15 is connected to the chip through the first end of the chip 2 and the second end of the chip 2, and the energy storage circuit 14 is also connected to the chip 2 through the first end of the chip 2 and the second end of the chip 2. That is, the winding assembly 15 and the energy storage circuit 14 are connected in parallel to the first end of the chip 2 and the second end of the chip 2, and the winding assembly 15 is used to charge the energy storage circuit 14. The winding assembly 15 inputs a third voltage to the control circuit 13 through the third end of the control circuit 13, and the control circuit 13 is used to control the first switch 111 to be disconnected based on the third voltage of the winding assembly 15, so that the first power supply circuit 11 stops supplying power to the energy storage circuit 14, which can reduce the power supply time of the first power supply circuit 11 and reduce power consumption.

[0044] Optionally, a transformer, an inductor or a DC power converter may be used as the winding assembly 15. For example, if a transformer is used, the performance of the transformer can be adjusted by changing the number of turns of the coil and the material of the core.

[0045] The control circuit 13 further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1 and a switch circuit 131. One end of the first resistor R1 and one end of the third resistor R3 are connected to one end of the first power supply circuit 11, and the other end of the first resistor R1 is connected to the control end of the first switch 111, one end of the second resistor R2, one end of the first capacitor C1 and the output end of the switch circuit 131 respectively.

[0046] One end of the first resistor R1 is connected to one end of the first power supply circuit 11, and the control circuit 13 receives the input voltage Vin through the first resistor R1; the other end of the first resistor R1 is connected to the control end of the first switch 111 and one end of the second resistor R2. Since the first resistor R1 and the second resistor R2 are connected in series, the voltage division ratio of the first resistor R1 and the second resistor R2 can be adjusted by adjusting the resistance values ​​of the first resistor R1 and the second resistor R2. That is, when the input voltage Vin remains unchanged, the voltage of the control end of the first switch 111 connected to the other end of the first resistor R1 can be adjusted by adjusting the resistance values ​​of the first resistor R1 and the second resistor R2, thereby controlling the first switch 111 to be turned on or off.

[0047] The other end of the third resistor R3 is connected to the input end of the switch circuit 131 and one end of the fourth resistor R4, respectively. The other end of the first capacitor C1, the other end of the second resistor R2 and the other end of the fourth resistor R4 are all grounded. One end of the third resistor R3 is connected to one end of the first power supply circuit 11, and the other end of the third resistor R3 is connected to the input end of the switch circuit 131 and one end of the fourth resistor R4. Since the third resistor R3 and the fourth resistor R4 are connected in series, the voltage division ratio of the third resistor R3 and the fourth resistor R4 can be adjusted by adjusting the resistance values ​​of the third resistor R3 and the fourth resistor R4. That is, when the input voltage Vin remains unchanged, the voltage input to the switch circuit 131 can be adjusted by adjusting the resistance values ​​of the third resistor R3 and the fourth resistor R4.

[0048] The switching circuit 131 includes a second switch 132, a first voltage-stabilizing tube 133 and a second voltage-stabilizing tube 134, the negative electrode of the first voltage-stabilizing tube 133 is connected to the other end of the third resistor R3, the positive electrode of the first voltage-stabilizing tube 133 is connected to the first end of the second switch 132, the second end of the second switch is connected to the other end of the first resistor R1, the positive electrode of the second voltage-stabilizing tube 134 is connected to the third end of the second switch 132, the negative electrode of the second voltage-stabilizing tube 134 is connected to the second end of the second switch 132, and the third end of the second switch 132 is grounded.

[0049] A first voltage regulator tube 133 is provided between the third resistor R3 and the first end of the second switch 132 to increase the threshold voltage when the second switch 132 is turned on, so as to facilitate the selection of the third resistor R3 and the fourth resistor R4. If the first voltage regulator tube 133 is not provided, the second switch 132 itself will be easily triggered by mistake due to the low gate line voltage, making it difficult to control the on or off of the second switch 132. The second voltage regulator tube 134 protects the first switch 111 to prevent the control terminal voltage of the first switch 111 from being damaged due to excessively high voltage.

[0050] Optionally, the second switch 132 includes but is not limited to controllable switching devices such as transistors, MOS transistors or IGBTs; for example, the second switch 132 is an NPN transistor, the first end of the second switch 132 is the base of the NPN transistor, the second end of the second switch 132 is the collector of the NPN transistor, and the third end of the second switch 132 is the emitter of the NPN transistor.

[0051] See also Figure 2 , Figure 4 As shown, Figure 4 yes Figure 2 A circuit diagram of another embodiment of a power supply circuit.

[0052] The switch circuit 131 includes a second switch 132, a first voltage regulator tube 133, and a second voltage regulator tube 134. The first end of the second switch 132 is connected to the other end of the third resistor R3, the second end of the second switch 132 is connected to the first end of the first resistor R1, the third end of the second switch 132 is grounded through the first voltage regulator tube 133, the positive electrode of the second voltage regulator tube 134 is connected to the third end of the second switch 132, and the negative electrode of the second voltage regulator tube 134 is connected to the second end of the second switch. The first voltage regulator tube 133 is connected in series to the third end of the second switch 132, so that the current when the second switch 132 is turned on can be kept within a specific range, so that the circuit can work stably. The specific functions of the other components of the switch circuit 131 have been described in detail above and will not be repeated here.

[0053] The control circuit 13 also includes a second capacitor C2, a fifth resistor R5 and a first diode D1, the positive electrode of the first diode D1 is connected to one end of the winding assembly 15, the negative electrode of the first diode D1 is connected to the other end of the third resistor R3 and one end of the second capacitor C2 through the fifth resistor R5, and the other end of the second capacitor C2 is grounded. The fifth resistor R5 is connected to the other end of the third resistor R3, the third resistor R3 is connected to the input voltage Vin, and the fifth resistor R5 is connected to one end of the winding assembly 15. In order to prevent the input voltage Vin from entering the winding assembly 15 through the third resistor R3 and the fifth resistor R5, a first diode D1 is set between the fifth resistor R5 and the winding assembly 15 to prevent current backflow. The third voltage output by the winding assembly 15 can reach the second switch 132 through R5. The fifth resistor R5, as a current limiting resistor, can make the second switch 132 run more stably when the third voltage is transmitted to the second switch 132, thereby improving the reliability of the second switch 132.

[0054] The power supply circuit also includes a second diode D2, the anode of the second diode D2 is connected to one end of the winding assembly 15, and the cathode of the second diode D2 is connected to the first end of the chip 2; the winding assembly 15 is connected to the chip through the first end of the chip 2 and the second end of the chip 2, and the first power supply circuit 11 and the second power supply circuit 12 are connected to the first end of the chip 2. The second diode D2 can prevent the first power supply circuit 11 and / or the second power supply circuit 12 from transmitting current to the winding assembly 15, thereby preventing current backflow.

[0055] The energy storage circuit 14 includes a third capacitor C3, and the two ends of the third capacitor C3 are respectively connected to the first end of the chip 2 and the second end of the chip 2; the first power supply circuit 11 and / or the second power supply circuit charges the third capacitor C3, so that the third capacitor C3 can provide the chip 2 with a startup voltage for the chip 2.

[0056] The first power supply circuit 11 further includes a sixth resistor R6, one end of the sixth resistor R6 serves as one end of the first power supply circuit 11, the other end of the sixth resistor R6 is connected to the first end of the first switch 111, and the second end of the first switch 111 is connected to the first end of the chip 2; the second power supply circuit 12 further includes a seventh resistor R7, one end of the seventh resistor R7 is connected to one end of the sixth resistor R6, and the other end of the seventh resistor R7 is connected to the first end of the chip 2. The resistance of the sixth resistor R6 is less than the resistance of the seventh resistor R7, the sixth resistor R6 is used to limit the charging current of the third capacitor C3 when the first voltage is input, and the seventh resistor R7 is used to limit the charging current of the third capacitor C3 when the second voltage is input.

[0057] Optionally, the first switch 111 includes but is not limited to controllable switching devices such as a triode, a MOS tube or an IGBT; for example, the first switch 111 is an NMOS tube, the first end of the first switch 111 is the drain of the NMOS tube, the second end of the first switch 111 is the source of the NMOS tube, and the control end of the first switch 111 is the gate of the NMOS tube.

[0058] The first power supply circuit 11 further includes a third diode D3, and the second end of the first switch 111 is connected to the first end of the chip 2 through the third diode D3; the second power supply circuit 12 further includes a fourth diode D4, and the other end of the seventh resistor R7 is connected to the first end of the chip 2 through the fourth diode D4. The winding assembly 15 and the third capacitor C3 are both connected to the chip through the first end and the second end of the chip 2. The third diode D3 and the fourth diode D4 are arranged between the chip 2 and the first power supply circuit 11 and the second power supply circuit 12 to prevent the third voltage output by the winding assembly 15 from being fed back to the first power supply circuit 11 and the second power supply circuit 12, thereby ensuring the stability of the power supply circuit.

[0059] The following details the working principle of the power supply circuit:

[0060] When the input voltage Vin inputs the first voltage:

[0061] The seventh resistor R7 has a large resistance, and the second power supply circuit 12 is not conducting.

[0062] After the input voltage Vin is divided by the third resistor R3 and the fourth resistor R4 , it cannot reach the breakdown voltage of the first voltage regulator 133 plus the turn-on voltage of the second switch 132 , so the second switch 132 is not turned on.

[0063] After the input voltage Vin is divided by the first resistor R1 and the second resistor R2, the voltage on the second resistor R2 is higher than the turn-on voltage of the first switch 111, and the first switch 111 is turned on; after the first switch 111 is turned on, the first power supply circuit 11 receives the input voltage Vin through the third capacitor C3, and after reaching the startup voltage of the chip 2, the chip 2 is started.

[0064] The winding assembly 15 supplies power to the chip 2 through the third capacitor C3, and charges the second capacitor C2 through the first diode D1, so that the voltage of the fourth resistor R4 increases. When the voltage of the fourth resistor R4 reaches the breakdown voltage of the first voltage regulator tube 133 plus the turn-on voltage of the second switch 132, the second switch 132 is turned on; the voltage at the control end of the first switch 111 is pulled down, the first switch 111 is disconnected, and the first power supply circuit 11 can no longer supply power to the chip 2, thereby reducing the loss.

[0065] When the input voltage Vin inputs the second voltage:

[0066] The second power supply circuit 12 is turned on.

[0067] After the input voltage Vin is divided by the third resistor R3 and the fourth resistor R4 , it reaches the breakdown voltage of the first voltage regulator 133 plus the turn-on voltage of the second switch 132 , so the second switch 132 is turned on.

[0068] The second switch 132 is turned on, pulling down the voltage on the control end of the first switch 111. The first switch 111 is turned off; the first power supply circuit 12 cannot supply power to the chip 2.

[0069] The present application also provides an electronic device. The electronic device of this embodiment includes the power supply circuit disclosed in the above embodiment, which will not be described in detail here.

[0070] In summary, the power supply circuit of the present application includes a first power supply circuit 11, a second power supply circuit 12, a control circuit 13 and an energy storage circuit 14; wherein the first power supply circuit 11 includes a first switch 111. The control circuit 13 controls the on or off of the first switch 111 based on the magnitude of the input voltage Vin, thereby controlling the on or off of the first power supply circuit 11. The on or off of the first power supply circuit 11 is controlled by the control circuit 13; the first power supply circuit 11 is powered when the first voltage is input, and the second power supply circuit 12 is powered when the second voltage is input, thereby reducing power consumption and startup time.

[0071] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power supply circuit, characterized in that: Used to power the chip, including: a first power supply circuit and a second power supply circuit, wherein one end of the first power supply circuit is connected to one end of the second power supply circuit, and the other end of the first power supply circuit and the other end of the second power supply circuit are connected to the first end of the chip, wherein the first power supply circuit comprises a first switch; a control circuit, wherein a first end of the control circuit is connected to one end of the first power supply circuit, and a second end of the control circuit is connected to a control end of the first switch; A tank circuit connected between the first end of the chip and the second end of the chip; One end of the first power supply circuit and one end of the second power supply circuit receive a first voltage, the control circuit is used to control the first switch to be turned on based on the first voltage, and the first power supply circuit is used to supply power to the energy storage circuit; One end of the first power supply circuit and one end of the second power supply circuit receive a second voltage, the control circuit is used to control the first switch to be disconnected based on the second voltage, the second power supply circuit is used to power the energy storage circuit, and the second voltage is greater than the first voltage.

2. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes a winding assembly, one end of which is respectively connected to the first end of the chip and the third end of the control circuit, and the other end of the winding assembly is connected to the second end of the chip; the winding assembly is used to charge the energy storage circuit, and the control circuit is used to control the first switch to be disconnected based on the third voltage of the winding assembly, and the first power supply circuit stops supplying power to the energy storage circuit.

3. The power supply circuit according to claim 2, characterized in that: The control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor and a switch circuit, one end of the first resistor and one end of the third resistor are connected to one end of the first power supply circuit, the other end of the first resistor is respectively connected to the control end of the first switch, one end of the second resistor, one end of the first capacitor and the output end of the switch circuit, the other end of the third resistor is respectively connected to the input end of the switch circuit and one end of the fourth resistor, and the other end of the first capacitor, the other end of the second resistor and the other end of the fourth resistor are all grounded.

4. The power supply circuit according to claim 3, characterized in that: The switching circuit includes a first voltage regulator tube, a second switch and a second voltage regulator tube, the cathode of the first voltage regulator tube is connected to the other end of the third resistor, the anode of the first voltage regulator tube is connected to the first end of the second switch, the second end of the second switch is connected to the other end of the first resistor, the anode of the second voltage regulator tube is connected to the third end of the second switch, the cathode of the second voltage regulator tube is connected to the second end of the second switch, and the third end of the second switch is grounded.

5. The power supply circuit according to claim 3, characterized in that: The switching circuit includes a first voltage regulator tube, a second switch and a second voltage regulator tube, wherein the first end of the second switch is connected to the other end of the third resistor, the second end of the second switch is connected to the other end of the first resistor, the third end of the second switch is grounded through the first voltage regulator tube, the positive electrode of the second voltage regulator tube is connected to the third end of the second switch, and the negative electrode of the second voltage regulator tube is connected to the second end of the second switch.

6. The power supply circuit according to claim 4 or 5, characterized in that: The control circuit also includes a second capacitor, a fifth resistor and a first diode, the anode of the first diode is connected to one end of the winding assembly, the cathode of the first diode is respectively connected to the other end of the third resistor and one end of the second capacitor through the fifth resistor, and the other end of the second capacitor is grounded.

7. The power supply circuit according to claim 2, characterized in that: The power supply circuit further includes a second diode, an anode of the second diode is connected to one end of the winding assembly, and a cathode of the second diode is connected to the first end of the chip.

8. The power supply circuit according to claim 1, characterized in that: The energy storage circuit includes a third capacitor, the first power supply circuit also includes a sixth resistor, one end of the sixth resistor serves as one end of the first power supply circuit, the other end of the sixth resistor is connected to the first end of the first switch, and the second end of the first switch is connected to the first end of the chip; The second power supply circuit further includes a seventh resistor, one end of the seventh resistor is connected to one end of the sixth resistor, and the other end of the seventh resistor is connected to the first end of the chip.

9. The power supply circuit according to claim 8, characterized in that: The first power supply circuit further includes a third diode, and the second end of the first switch is connected to the first end of the chip through the third diode; The second power supply circuit further includes a fourth diode, and the other end of the seventh resistor is connected to the first end of the chip through the fourth diode.

10. An electronic device, characterized in that: The invention comprises a chip and a power supply circuit as claimed in any one of claims 1 to 9, wherein the power supply circuit is connected to the chip and is used to supply power to the chip.

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