Power supply control circuit and terminal

Abstract

This application discloses a power supply control circuit and terminal, relating to the field of power supply control technology, and applied to a power supply control terminal. The input terminal connects to the main power supply for standby and the secondary power supply for operation, and the output terminal connects to the chip power supply terminal. The voltage of the main power supply is greater than the voltage of the secondary power supply. The circuit includes a first control unit, with its first terminal connected to the main power supply, outputting a first voltage under the control of the main power supply; a second control unit, with its first terminal connected to the secondary power supply and its second terminal connected to the second terminal of the first control unit, outputting a second voltage under the control of the secondary power supply and stopping the output of the first voltage; and a voltage regulator unit, with its first terminal connected to the third terminal of the second control unit and the third terminal of the first control unit, and its second terminal connected to the chip power supply terminal. In standby mode, the first voltage supplies power; in operation mode, the second voltage supplies power. This application provides a new power supply control method, solving the problem of continuous heat generation in LDOs during operation.

Description

Technical Field

[0001] This application relates to the field of power supply control technology, and in particular to a power supply control circuit and terminal. Background Technology

[0002] With the continuous development of LDOs (Low Dropout Regulators), users have also put forward higher requirements for the power supply control methods on LDOs.

[0003] Traditional power supply control continuously uses the main power supply to power the LDO, meaning that the main power supply powers the LDO in both standby and operating states. The LDO then generates additional voltages to supply power to other power-consuming components. For example, in audio products, a 5V main power supply powers the LDO, which in turn generates 0.9V to power the internal chips. This power supply control method has limitations. When the system enters the operating state, the increased load on the chip's power supply (i.e., the internal chips of the audio product begin operating) causes the LDO to overheat. Therefore, a new power supply control method is urgently needed to solve the problem of continuous LDO overheating during operation.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of this application is to provide a power supply control circuit and terminal, which aims to provide a new power supply control method to solve the technical problem of continuous heat generation of LDO during operation.

[0006] To achieve the above objectives, this application provides a power supply control circuit applied to a power supply control terminal. The input terminal of the power supply control circuit is connected to the main power supply and the secondary power supply of the power supply control terminal. The output terminal of the power supply control circuit is connected to the chip power supply terminal of the power supply control terminal. The main power supply provides power when the power supply control terminal is in standby mode, and the secondary power supply provides power when the power supply control terminal is in operating mode. A first voltage of the main power supply is greater than a second voltage of the secondary power supply. The power supply control circuit includes: A first control unit, the first terminal of which is connected to the main power supply, is used to output the first voltage under the control of the main power supply; The second control unit has a first terminal connected to the secondary power supply and a second terminal connected to the second terminal of the first control unit. The second control unit is used to output the second voltage under the control of the secondary power supply and to control the first control unit to stop outputting the first voltage. A voltage regulator unit, wherein a first terminal of the voltage regulator unit is connected to a third terminal of the second control unit and a third terminal of the first control unit, and a second terminal of the voltage regulator unit is connected to a power supply terminal of the chip, wherein the voltage regulator unit is used to supply power to the power supply terminal of the chip according to the first voltage when the power supply control terminal is in standby mode, and to supply power to the power supply terminal of the chip according to the second voltage when the power supply control terminal is in working mode.

[0007] In one embodiment, the first control unit includes: A first resistor, the first end of which is connected to the main power supply, and the second end of which is connected to the second end of the second control unit; The second resistor has its first end connected to the second end of the first resistor, and its second end grounded. The third resistor, the first end of which is connected to the main power supply; A first capacitor, the first terminal of which is connected to the main power supply, and the second terminal of which is connected to the second terminal of the third resistor; A switching transistor, the first end of which is connected to the main power supply, the second end of which is connected to the second end of the first capacitor, and the third end of which is connected to the first end of the voltage regulator unit and the third end of the second control unit; A fourth resistor, the first end of which is connected to the main power supply, and the second end of which is connected to the third end of the switching transistor; The fifth resistor, the first end of which is connected to the second end of the first capacitor; The first transistor has its first terminal connected to the second terminal of the fifth resistor, its second terminal connected to the second terminal of the first resistor, and its third terminal grounded.

[0008] In one embodiment, the second control unit includes: A drive control subunit, wherein a first terminal of the drive control subunit is connected to the secondary power supply, and a second terminal of the drive control subunit is connected to the second terminal of the first resistor in the first control unit; A power supply control subunit, wherein the first end of the power supply control subunit is connected to the secondary power supply, and the second end of the power supply control subunit is connected to the third end of the switching transistor in the first control unit.

[0009] In one embodiment, the drive control subunit includes: The sixth resistor, the first end of which is connected to the secondary power supply; The seventh resistor, the first end of which is connected to the second end of the sixth resistor; The eighth resistor, wherein the first end of the eighth resistor is connected to the second end of the first resistor; The second transistor has its first terminal connected to the second terminal of the eighth resistor, its second terminal connected to the second terminal of the seventh resistor, and its third terminal grounded. The ninth resistor has its first end connected to the second end of the seventh resistor, and its second end is grounded. The second capacitor has its first terminal connected to the second terminal of the seventh resistor, and its second terminal is grounded.

[0010] In one embodiment, the power supply control subunit includes: The tenth resistor, the first end of which is connected to the secondary power supply; A diode, wherein the anode of the diode is connected to the second terminal of the tenth resistor, and the cathode of the diode is connected to the third terminal of the switching transistor.

[0011] In one embodiment, the voltage regulator unit includes: A voltage regulator chip, wherein the input terminal of the voltage regulator chip is connected to the cathode of the diode in the second control unit and the third terminal of the switching transistor in the first control unit, and the output terminal of the voltage regulator chip is connected to the power supply terminal of the chip; The third capacitor has its first terminal connected to the input terminal of the voltage regulator chip, and its second terminal grounded. The fourth capacitor has its first terminal connected to the input terminal of the voltage regulator chip, and its second terminal grounded. The fifth capacitor has its first terminal connected to the enable terminal of the voltage regulator chip, and its second terminal grounded. The eleventh resistor has its first end connected to the enable terminal of the voltage regulator chip, and its second end grounded. The twelfth resistor has its first end connected to the output terminal of the voltage regulator chip and its second end connected to the feedback terminal of the voltage regulator chip. The thirteenth resistor has its first end connected to the feedback terminal of the voltage regulator chip, and its second end grounded. The sixth capacitor has its first terminal connected to the output terminal of the voltage regulator chip, and its second terminal grounded. The seventh capacitor has its first terminal connected to the output terminal of the voltage regulator chip, and its second terminal grounded.

[0012] In one embodiment, when the power supply control terminal is in standby mode, the main power supply sequentially controls the first transistor and the switching transistor in the first control unit to turn on, and a first power supply path is formed between the main power supply and the first terminal of the voltage regulator unit, so as to supply power to the chip power supply terminal using the first voltage according to the first power supply path.

[0013] In one embodiment, when the power supply control terminal is in working state, the secondary power supply controls the second transistor in the second control unit to turn on, so as to control the first transistor and the switching transistor in the first control unit to turn off. The secondary power supply also controls the diode in the second control unit to turn on. A second power supply path is formed between the secondary power supply and the first terminal of the voltage regulator unit, so as to use the second voltage to supply power to the chip power supply terminal according to the second power supply path.

[0014] In addition, to achieve the above objectives, this application also provides a power supply control terminal, which includes the aforementioned power supply control circuit, main power supply, secondary power supply and chip power supply terminal; The input terminal of the power supply control circuit is connected to the main power supply and the secondary power supply, and the output terminal of the power supply control circuit is connected to the power supply terminal of the chip. The main power supply provides power when the power supply control terminal is in standby mode, and the secondary power supply provides power when the power supply control terminal is in working mode. The first voltage of the main power supply is greater than the second voltage of the secondary power supply.

[0015] In one embodiment, the secondary power supply is the power supply for the power management integrated circuit in the power supply control terminal, and the power management integrated circuit is configured to start outputting the secondary power supply when the power supply control terminal is in operation.

[0016] This application provides a power supply control circuit applied to a power supply control terminal. The input terminal of the power supply control circuit is connected to the main power supply and the secondary power supply of the power supply control terminal. The output terminal of the power supply control circuit is connected to the chip power supply terminal of the power supply control terminal. The main power supply provides power when the power supply control terminal is in standby mode, and the secondary power supply provides power when the power supply control terminal is in operating mode. The first voltage of the main power supply is greater than the second voltage of the secondary power supply. The power supply control circuit includes: a first control unit, whose first terminal is connected to the main power supply, and is used to output the first voltage under the control of the main power supply; a second control unit, whose first terminal is connected to the secondary power supply, and whose second terminal is connected to the second terminal of the first control unit, and is used to output the second voltage under the control of the secondary power supply, and control the first control unit to stop outputting the first voltage; and a voltage regulator unit, whose first terminal is connected to the third terminal of the second control unit and the third terminal of the first control unit. The second terminal of the voltage regulator unit is connected to the chip power supply terminal. The voltage regulator unit is used to supply power to the chip power supply terminal according to the first voltage when the power supply control terminal is in standby mode, and according to the second voltage when the power supply control terminal is in working mode. This power supply control method selects to supply power to the chip power supply terminal through the main power supply and the secondary power supply of the power supply control terminal. At the same time, combined with the fact that the main power supply supplies power when the power supply control terminal is in standby mode, and the secondary power supply supplies power when the power supply control terminal is in working mode, and the voltage property that the first voltage of the main power supply is greater than the second voltage of the secondary power supply, it can realize that when the power supply control terminal is in standby mode, the chip power supply terminal is supplied according to the first voltage, and when the power supply control terminal is in working mode, the chip power supply terminal is supplied according to the second voltage. This avoids the problem of continuous heat generation of the LDO when the power supply terminal enters working mode because the load on the chip power supply terminal (i.e., the chip inside the audio product starts to work) increases. In other words, this power supply control method supplies power to the chip's power supply terminal based on a first voltage when the power supply control terminal is in standby mode, and supplies power to the chip's power supply terminal based on a second voltage when the power supply control terminal is in working mode. The first voltage of the main power supply is greater than the second voltage of the secondary power supply, thereby selecting the secondary power supply for power supply in working mode, reducing the input-output voltage difference of the LDO, and solving the problem of continuous heat generation of the LDO in working mode. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the first embodiment of the power supply control circuit of this application; Figure 2 This is a circuit diagram of the first control unit in the power supply control circuit of this application; Figure 3 This is a schematic diagram of the second control unit in the power supply control circuit of this application; Figure 4 This is a circuit diagram of the second control unit in the power supply control circuit of this application; Figure 5 This is another circuit diagram of the second control unit in the power supply control circuit of this application; Figure 6 This is a circuit diagram of the voltage regulator unit in the power supply control circuit of this application; Figure 7 This is a schematic diagram of one control path of the power supply control circuit of this application; Figure 8 This is another schematic diagram of the power supply control circuit of this application.

[0018] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0019] Explanation of icon numbers: 1001 Processing device; 1002 Read-only memory; 1003 Storage device; 1004 Random access memory; 1005 Bus; 1006 Input / output interface; 1007 Input device; 1008 Output device; 1009 Communication device; 110 Main power supply; 120 Secondary power supply; 130 Chip power supply terminal; 10 First control unit; 20 Second control unit; 30 Voltage regulator unit; R1 First resistor; R2 Second resistor; R3 Third resistor; R4 Fourth resistor; R5 Fifth resistor; Q1 First transistor; T1 Switching transistor; C1 First capacitor; 21 Driver 22. Power Supply Control Subunit; R6, Sixth Resistor; R7, Seventh Resistor; R8, Eighth Resistor; R9, Ninth Resistor; R10, Tenth Resistor; C2, Second Capacitor; Q2, Second Transistor; D1, Diode; U1, Voltage Regulator Chip; C3, Third Capacitor; C4, Fourth Capacitor; C5, Fifth Capacitor; C6, Sixth Capacitor; C7, Seventh Capacitor; R11, Eleventh Resistor; R12, Twelfth Resistor; R13, Thirteenth Resistor; IN, Input Terminal of Voltage Regulator Chip; OUT, Output Terminal of Voltage Regulator Chip; EN, Enable Terminal of Voltage Regulator Chip; ENX, Enable Signal; FB, Feedback Terminal of Voltage Regulator Chip. Detailed Implementation

[0020] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0021] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Currently, audio products such as BTSpeakers, Wi-Fi speakers, and S-BARs typically use LDOs to generate 0.9V to supply the core chip via the system's main power supply (usually 5V). This assumes the chip's power supply requires 0.9V. In standby mode, this power control method generates little heat due to the low load resistance, preventing the LDO from overheating. However, during normal power-on, the increased load from the core chip and other components causes the LDO to overheat, ultimately affecting the overall power control efficiency. It's worth noting that the LDO overheats under load because it must dissipate the voltage difference (Vin-Vout) as heat. The formula for heat generation under load is (Vin-Vout)*I, where I is the current under load. The low efficiency occurs because Vout is much smaller than Vin; most of the energy is converted into heat rather than supplied to the load. Since I is approximately zero under no load, it doesn't affect heat generation in standby mode.

[0023] Therefore, based on the shortcomings of the above power supply control methods, the power supply control circuit of this application is proposed. The solution of this application embodiment is: to select the power supply to the chip power terminal through the main power supply and the secondary power supply of the power supply control terminal, and to combine the main power supply supplying power when the power supply control terminal is in standby mode, and the secondary power supply supplying power when the power supply control terminal is in working mode, and the voltage property that the first voltage of the main power supply is greater than the second voltage of the secondary power supply, so as to achieve that when the power supply control terminal is in standby mode, the chip power terminal is supplied according to the first voltage, and when the power supply control terminal is in working mode, the chip power terminal is supplied according to the second voltage. This avoids the problem of continuous heat generation of the LDO when the power supply state enters the working state, because the load on the chip power terminal (i.e., the chip inside the audio product starts to work) increases. In other words, this power supply control method supplies power to the chip's power supply terminal based on a first voltage when the power supply control terminal is in standby mode, and supplies power to the chip's power supply terminal based on a second voltage when the power supply control terminal is in working mode. The first voltage of the main power supply is greater than the second voltage of the secondary power supply, thereby selecting the secondary power supply for power supply in working mode, reducing the input-output voltage difference of the LDO, and solving the problem of continuous heat generation of the LDO in working mode.

[0024] It should be noted that the main body of this embodiment can be any terminal that performs power supply control, such as the power supply control circuit of audio products like BTSpeaker (Bluetooth Speaker), wifispeaker (Wireless Fidelity Speaker), and S-BAR (Soundbar), as well as the power supply control circuit of a display screen, refrigerator, and washing machine. The following description uses the power supply control circuit of an audio product as an example to illustrate this embodiment and the subsequent embodiments.

[0025] Based on this, the embodiments of this application provide a power supply control circuit, referring to... Figure 1 , Figure 1 This is a schematic diagram of the first embodiment of the power supply control circuit of this application.

[0026] Reference Figure 1 This application provides a power supply control circuit applied to a power supply control terminal. The input terminal of the power supply control circuit is connected to the main power supply 110 and the secondary power supply 120 of the power supply control terminal, and the output terminal is connected to the chip power supply terminal 130 of the power supply control terminal. The main power supply 110 supplies power when the power supply control terminal is in standby mode, and the secondary power supply 120 supplies power when the power supply control terminal is in operating mode. The first voltage of the main power supply 110 is greater than the second voltage of the secondary power supply 120. The power supply control circuit includes: The first control unit 10 has its first terminal connected to the main power supply 110. The first control unit 10 is used to output a first voltage under the control of the main power supply 110. The second control unit 20 has a first terminal connected to the secondary power supply 120 and a second terminal connected to the second terminal of the first control unit 10. The second control unit 20 is used to output a second voltage under the control of the secondary power supply 120 and to control the first control unit 10 to stop outputting the first voltage. The voltage regulator unit 30 has its first terminal connected to the third terminal of the second control unit 20 and the third terminal of the first control unit 10, and its second terminal connected to the chip power supply terminal 130. The voltage regulator unit 30 is used to supply power to the chip power supply terminal 130 according to the first voltage when the power supply control terminal is in standby mode, and to supply power to the chip power supply terminal 130 according to the second voltage when the power supply control terminal is in working mode.

[0027] In this embodiment, based on the shortcomings of existing power supply control methods during operation, a power supply control method of this application is proposed. Its core control method utilizes discrete components to build a power supply control circuit, and implements an LDO multi-voltage input scheme through timing and logic control. This achieves a lower power consumption LDO circuit with minimal cost. Specifically, it controls the use of either the main power supply 110 or the secondary power supply 120 to provide input to the voltage regulator unit 30, thereby supplying power to the chip power supply terminal 130. The timing sequence is as follows: the main power supply 110 supplies power when the power supply control terminal is in standby mode, the secondary power supply 120 supplies power when the power supply control terminal is in operating mode, and the main... The first voltage of the main power supply 110 is greater than the second voltage of the secondary power supply 120. Therefore, based on the power supply timing and magnitude relationship between the main power supply 110 and the secondary power supply 120, the power supply control of the entire power supply control terminal during standby and operation can be realized. When the entire power supply control terminal is in operation, the input of the voltage regulator unit 30 is provided by the lower voltage secondary power supply 120 to reduce the voltage difference between the input and output of the voltage regulator unit 30. By reducing the heat generation of the LDO, the power supply control effect is guaranteed, that is, the impact of LDO overheating on the entire power supply control is avoided, while effectively utilizing electrical energy (i.e., reducing the electrical energy generated by work).

[0028] Specifically, the power supply control circuit includes a first control unit 10, with its first terminal connected to the main power supply 110 and its third terminal connected to the first terminal of the voltage regulator unit 30. Under the control of the main power supply 110, a first voltage can be output to the voltage regulator unit 30. After processing by the voltage regulator unit 30, the first voltage is supplied to the chip power supply terminal 130, thus enabling the main power supply 110 to provide power. Since the main power supply 110 provides power when the power supply control terminal is in standby mode, it can also be used for power supply in standby mode. A second control unit 20 is also designed, with its first terminal connected to the secondary power supply 120, its second terminal connected to the second terminal of the first control unit 10, and its third terminal connected to the first terminal of the voltage regulator unit 30. The second control unit 20 is used to output a second voltage under the control of the secondary power supply 120. Furthermore, because of the connection between the second terminal of the second control unit 20 and the second terminal of the first control unit 10, the first control unit 10 can be stopped from outputting the first voltage under the control of the secondary power supply 120. This refers to a scenario where the secondary power supply 120 is powered by the control of the first control unit 10 and the second control unit 20. Since the secondary power supply 120 provides power when the power supply control terminal is in operation, it can be used during operation to reduce the voltage difference between the input and output terminals of the voltage regulator unit 30, thereby improving the LDO's heat generation. It's worth noting that if the secondary power supply 120 is used throughout the entire process, the main power supply 110 would need to be stepped down using a buck circuit or buck chip, increasing the cost of the entire power supply control circuit. However, by utilizing the timing of the power supply control terminal's use of the secondary power supply 120 during operation to switch to the main power supply 110, power supply control can be performed according to the timing of the power supply control terminal. No additional hardware is needed, and discrete components can be used to improve the LDO's heat generation without changing the overall hardware design of the power supply terminal. Furthermore, the first control unit 10 and the second control unit 20 can be chips or circuits that implement the above control logic. The voltage regulator unit 30 is a circuit including a voltage regulator chip to regulate the input voltage to obtain the voltage required by the chip power supply terminal 130. Of course, the three voltages in the entire power supply control circuit need to meet the following conditions: the first voltage of the main power supply 110 is greater than the second voltage of the secondary power supply 120 to improve the heat generation during operation; the second voltage of the secondary power supply 120 is greater than or equal to the voltage required by the chip power supply terminal 130 to ensure the driving operation of the chip power supply terminal 130. Alternatively, the voltage regulator unit 30 can also have a boost function, in which case the difference between the first voltage and the required voltage is greater than the difference between the second voltage and the required voltage to improve the heat generation of the LDO.

[0029] In this embodiment, a power supply control circuit is provided. This circuit is applied to a power supply control terminal. The input terminal of the power supply control circuit is connected to the main power supply and the secondary power supply of the power supply control terminal. The output terminal of the power supply control circuit is connected to the chip power supply terminal of the power supply control terminal. The main power supply provides power when the power supply control terminal is in standby mode, and the secondary power supply provides power when the power supply control terminal is in working mode. The first voltage of the main power supply is greater than the second voltage of the secondary power supply. The power supply control circuit includes: a first control unit, the first terminal of which is connected to the main power supply, and the first control unit is used to output the first voltage under the control of the main power supply; a second control unit, the first terminal of which is connected to the secondary power supply, and the second terminal of which is connected to the second terminal of the first control unit, and the second control unit is used to output the second voltage under the control of the secondary power supply, and control the first control unit to stop outputting the first voltage; and a voltage regulator unit, the first terminal of which is connected to the third terminal of the second control unit and the third terminal of the first control unit. The second terminal of the voltage regulator unit is connected to the chip power supply terminal. The voltage regulator unit is used to supply power to the chip power supply terminal according to the first voltage when the power supply control terminal is in standby mode, and according to the second voltage when the power supply control terminal is in working mode. This power supply control method selects to supply power to the chip power supply terminal through the main power supply and the secondary power supply of the power supply control terminal. At the same time, combined with the fact that the main power supply supplies power when the power supply control terminal is in standby mode, and the secondary power supply supplies power when the power supply control terminal is in working mode, and the voltage property that the first voltage of the main power supply is greater than the second voltage of the secondary power supply, it can realize that when the power supply control terminal is in standby mode, the chip power supply terminal is supplied according to the first voltage, and when the power supply control terminal is in working mode, the chip power supply terminal is supplied according to the second voltage. This avoids the problem of continuous heat generation of the LDO when the power supply terminal enters working mode because the load on the chip power supply terminal (i.e., the chip inside the audio product starts to work) increases. In other words, this power supply control method supplies power to the chip's power supply terminal based on a first voltage when the power supply control terminal is in standby mode, and supplies power to the chip's power supply terminal based on a second voltage when the power supply control terminal is in working mode. The first voltage of the main power supply is greater than the second voltage of the secondary power supply, thereby selecting the secondary power supply for power supply in working mode, reducing the input-output voltage difference of the LDO, and solving the problem of continuous heat generation of the LDO in working mode.

[0030] Furthermore, based on the first embodiment of this application described above, a second embodiment of the power supply control circuit of this application is proposed. In this embodiment, reference is made to... Figure 2 , Figure 2 This is a circuit diagram of the first control unit in the power supply control circuit of this application. The first control unit 10 includes: The first resistor R1 has its first end connected to the main power supply 110 and its second end connected to the second end of the second control unit 20. The second resistor R2 has its first end connected to the second end of the first resistor R1, and its second end is grounded. The third resistor R3, the first end of the third resistor R3 is connected to the main power supply 110; The first capacitor C1 has its first terminal connected to the main power supply 110, and its second terminal connected to the second terminal of the third resistor R3. Switch T1 has its first terminal connected to the main power supply 110, its second terminal connected to the second terminal of the first capacitor C1, and its third terminal connected to the first terminal of the voltage regulator unit 30 and the third terminal of the second control unit 20. The fourth resistor R4 has its first end connected to the main power supply 110 and its second end connected to the third end of the switching transistor T1. The fifth resistor R5 has its first end connected to the second end of the first capacitor C1. The first transistor Q1 has its first terminal connected to the second terminal of the fifth resistor R5, its second terminal connected to the second terminal of the first resistor R1, and its third terminal grounded.

[0031] In this embodiment, the circuit design of the first control unit 10 is used as an example for explanation. The function of the first control unit 10 is to drive the main power supply 110, thereby connecting the main power supply 110 to the first terminal of the voltage regulator unit 30. For example, the first control unit 10 can be a chip or controller. The principle of this chip or controller is that when the main power supply 110 has voltage output, it will output the main power supply 110 to the first terminal of the voltage regulator unit 30 to power the input terminal of the voltage regulator unit 30. For example, refer to... Figure 2Taking a main power supply 110 of 5V and a chip power supply terminal 130 requiring 0.9V as an example, the first control unit 10 mainly includes a switching transistor T1, a first transistor Q1, and other resistors and capacitors (mainly used for protection circuits or current limiting, voltage limiting, filtering, etc.). Assuming that the first transistor Q1 conducts at high levels and is cut off at low levels, and the switching transistor T1 conducts at low levels and is cut off at high levels, when the main power supply 110 outputs 5V, after voltage division by the first resistor R1 and the second resistor R2, the first transistor... With the base of transistor Q1 connected to a high level, the collector and emitter of transistor Q1 are connected, resulting in the fifth resistor R5 being grounded. This means the gate of switching transistor T1 is grounded, and the source and drain of switching transistor T1 are connected. At this time, the 5V output from the main power supply 110 is sent to the first terminal of the voltage regulator unit 30. The voltage regulator unit 30 then steps down the 5V voltage to obtain the required 0.9V for the chip power supply terminal 130. Because the main power supply 110 provides power during standby, the input-output voltage difference of the voltage regulator unit 30 is 4.1V. However, the standby current is approximately zero, preventing overheating of the voltage regulator chip in the voltage regulator unit 30 and ensuring the basic functions of the entire power supply control terminal.

[0032] Furthermore, based on the first and / or second embodiments of this application described above, a third embodiment of the power supply control circuit of this application is proposed. In this embodiment, reference is made to... Figure 3 , Figure 3 This is a schematic diagram of the framework of the second control unit in the power supply control circuit of this application. The second control unit 20 includes: Drive control subunit 21, the first end of drive control subunit 21 is connected to secondary power supply 120, and the second end of drive control subunit 21 is connected to the second end of first resistor R1 in first control unit 10; The power supply control subunit 22 has its first end connected to the secondary power supply 120 and its second end connected to the third end of the switching transistor T1 in the first control unit 10.

[0033] Furthermore, refer to Figure 4 , Figure 4 This is a circuit diagram of the second control unit in the power supply control circuit of this application. The drive control subunit 21 includes: The sixth resistor R6 has its first terminal connected to the secondary power supply 120. The seventh resistor R7 is connected at its first end to the second end of the sixth resistor R6. The eighth resistor R8 has its first terminal connected to the second terminal of the first resistor R1. The second transistor Q2 has its first terminal connected to the second terminal of the eighth resistor R8, its second terminal connected to the second terminal of the seventh resistor R7, and its third terminal grounded. The ninth resistor R9 has its first terminal connected to the second terminal of the seventh resistor R7, and its second terminal is grounded. The second capacitor C2 has its first terminal connected to the second terminal of the seventh resistor R7, and its second terminal grounded.

[0034] Furthermore, refer to Figure 5 , Figure 5 This is another circuit diagram of the second control unit in the power supply control circuit of this application. The power supply control subunit 22 includes: The tenth resistor R10, the first end of the tenth resistor R10 is connected to the secondary power supply 120; Diode D1 has its anode connected to the second terminal of the tenth resistor R10, and its cathode connected to the third terminal of the switching transistor T1.

[0035] In this embodiment, the circuit design of the second control unit 20 is used as an example for explanation. The main function of the second control unit 20 is to drive the secondary power supply 120, thereby connecting the devices in the line between the secondary power supply 120 and the first terminal of the voltage regulator unit 30. Simultaneously, the control of the secondary power supply 120, due to its connection with the first control unit 10, also controls the first control unit 10 to stop outputting the first voltage. For example, the second control unit 20 can be a chip or controller. The principle of this chip or controller is that when the secondary power supply 120 has voltage output, it outputs the secondary power supply 120 to the first terminal of the voltage regulator unit 30 to power the input terminal of the voltage regulator unit 30, while simultaneously controlling the first control unit 10 to stop outputting the first voltage. For example, refer to... Figure 5The second control unit 20 includes a drive control subunit 21, whose main function is to control the first control unit 10 to stop outputting the first voltage under the control of the secondary power supply 120. Similarly, if the conduction property of the second transistor Q2 is high level conduction and low level cutoff, when the secondary power supply 120 outputs 3.3V, after voltage division by the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8, the second terminal (base) of the second transistor Q2 is connected to the high level, and the first terminal (collector) of the second transistor Q2 and the third terminal (emitter) of the second transistor Q2 are connected, forming the state of the eighth resistor R8 being grounded. At this time, the eighth resistor R8 can be set to a very small value so that the second terminal of the first transistor Q1 is equivalent to grounded. Even if the main power supply 110 continues to supply power, the second terminal of the first transistor Q1 is grounded, preventing it from conducting. Consequently, because the second terminal (gate) of the switching transistor T1 is connected to the main power supply 110, the connection between the first terminal (source) and the third terminal (drain) of the switching transistor T1 is broken. Therefore, the 3.3V output from the secondary power supply 120 is sent to the first terminal of the voltage regulator unit 30. The voltage regulator unit 30 then steps down the 3.3V voltage to obtain the required 0.9V for the chip power supply terminal 130. This lower voltage is used for power supply control to avoid overheating of the LDO and to ensure the normal operation of the entire power supply control terminal.

[0036] Furthermore, when the secondary power supply 120 is supplying power, the power supply control subunit 22 can directly turn on the diode D1, thereby outputting the 3.3V of the secondary power supply 120 to the first terminal of the voltage regulator unit 30, thus completing the power supply of the secondary power supply 120.

[0037] In one embodiment, reference is made to Figure 6 , Figure 6 This is a circuit diagram of the voltage regulator unit in the power supply control circuit of this application. The voltage regulator unit 30 includes: The voltage regulator chip U1 has its input terminal IN connected to the cathode of diode D1 in the second control unit 20 and the third terminal of switching transistor T1 in the first control unit 10. The output terminal OUT of the voltage regulator chip U1 is connected to the chip power supply terminal 130. The third capacitor C3 has its first terminal connected to the input terminal IN of the voltage regulator chip U1, and its second terminal grounded. The fourth capacitor C4 has its first terminal connected to the input terminal IN of the voltage regulator chip U1, and its second terminal grounded. The fifth capacitor C5 has its first terminal connected to the enable terminal EN of the voltage regulator chip U1, and its second terminal grounded. The eleventh resistor R11 has its first terminal connected to the enable terminal EN of the voltage regulator chip U1, and its second terminal grounded. The twelfth resistor R12 has its first end connected to the output terminal OUT of the voltage regulator chip U1, and its second end connected to the feedback terminal FB of the voltage regulator chip U1. The thirteenth resistor R13 has its first end connected to the feedback terminal FB of the voltage regulator chip U1, and its second end grounded. The sixth capacitor C6 has its first terminal connected to the output terminal OUT of the voltage regulator chip U1, and its second terminal grounded. The seventh capacitor C7 has its first terminal connected to the output terminal OUT of the voltage regulator chip U1, and its second terminal grounded.

[0038] In this embodiment, the voltage regulator unit 30 includes a voltage regulator chip U1 and capacitors and resistors for protecting and controlling the input and output terminals of the voltage regulator chip U1. The voltage regulator chip U1 can be an LP3980 or other models, which are not limited here. The enable signal ENX mainly drives and controls the voltage regulator chip U1. For example, when ENX=1, the voltage regulator chip U1 starts working, and when ENX=0, the voltage regulator chip U1 stops working. At this time, through the control of the two control units mentioned above, the following can be achieved: the main power supply 110 provides a power of P=UI=5*0.3=1.5W when it is working, and the secondary power supply 120 provides a power of P=UI=3.3*0.3=0.99W when it is working. Assuming that the current during operation is 0.3, the power consumption of using the secondary power supply 120 is reduced by about 40%.

[0039] Furthermore, at this point, feedback control can be achieved by combining the feedback terminal FB of the voltage regulator chip U1 (i.e., LDO). The current value at the feedback terminal is collected, compared with the theoretical current value, and the output signal is sent to a third transistor connected between the sixth resistor R6 and the seventh resistor R7, thereby completing the feedback control of the entire circuit. For example, under normal circumstances, the secondary power supply 120 can meet the current output of D1. However, if the feedback terminal FB of the voltage regulator chip U1 (or a current sensor, etc.) collects a current value of D1+1, it is determined that the secondary power supply 120 is too low to meet the high current output. Therefore, the circuit is instructed to use the main power supply 110 for power. D1+1 and D1 are then passed through a comparator to output a high level (i.e., the comparator is set so that if one input is greater than the other, it outputs a high level; if one input is less than or equal to the other, it outputs a low level). This high level is then sent to the third transistor, which is set to high level to cut off. At this time, the connection between the secondary power supply 120 and the second transistor Q2 is broken, and the main power supply 110 (which powers all scenarios, but is cut off during operation) will continue to be used to ensure the accuracy of the power supply. Of course, when the collected current value is D1-1, the comparator outputs a low level to normally control the third transistor to conduct, so as to perform normal control of the subsequent drive control subunit 21, thereby realizing the power supply of the secondary power supply 120.

[0040] Furthermore, based on the first, second, and third embodiments of this application described above, a fourth embodiment of the power supply control circuit of this application is proposed. In this embodiment, reference is made to... Figure 7 , Figure 7 This is a schematic diagram of a power supply control circuit of this application. When the power supply control terminal is in standby mode, the main power supply 110 sequentially controls the first transistor Q1 and the switching transistor T1 in the first control unit 10 to turn on. A first power supply path is formed between the main power supply 110 and the first terminal of the voltage regulator unit 30. The first voltage is used to supply power to the chip power supply terminal 130 according to the first power supply path.

[0041] In another embodiment, reference is made to Figure 8 , Figure 8 This is another schematic diagram of the power supply control circuit of this application. When the power supply control terminal is in working state, the secondary power supply 120 controls the second transistor Q2 in the second control unit 20 to conduct, so as to control the first transistor Q1 and the switching transistor T1 in the first control unit 10 to be cut off. The secondary power supply 120 also controls the diode D1 in the second control unit 20 to conduct. A second power supply path is formed between the secondary power supply 120 and the first terminal of the voltage regulator unit 30. The second voltage is used to supply power to the chip power supply terminal 130 according to the second power supply path.

[0042] In this embodiment, the power supply control circuit mainly has two states: a standby state where the main power supply 110 is used normally, and an operating state where the secondary power supply 120 is used. (See reference...) Figure 7 When the power supply control terminal is in standby mode, it is powered by the main power supply 110. Meanwhile, because the selected secondary power supply 120 is the output voltage of the PMIC (Power Management Integrated Circuit), it has no voltage during the entire standby state. At this time, the first transistor Q1 in the second control unit 20 is driven to conduct by the main power supply 110, which in turn controls the switching transistor T1 to conduct. This ensures that the main power supply 110 supplies power to the LDO, guaranteeing the normal operation of the chip's power supply terminal 130. Simultaneously, because the secondary power supply 120 has no output, the second transistor Q2 is in the off state, and the cathode of diode D1 also has no output. In another embodiment, when the entire terminal is powered on, the power management integrated circuit begins to output secondary power supply 120. Secondary power supply 120 then controls the second transistor Q2 in the second control unit 20 to conduct, thereby controlling the first transistor Q1 and the switching transistor T1 in the first control unit 10 to cut off the output of the main power supply 110. Simultaneously, it also controls the diode D1 in the second control unit 20 to conduct, forming a second power supply path between the secondary power supply 120 and the first terminal of the voltage regulator unit 30. Based on this second power supply path, a second voltage is used to power the chip power supply terminal 130. At this time, the system enters a low-heat, high-efficiency normal operation mode. It is worth noting that the control of the switching transistor, transistor, and diode in the first and second control units can be explained using the control principle of the above embodiment, and will not be repeated here.

[0043] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the power supply control circuit of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0044] This application also provides a power supply control terminal, which includes the power supply control circuit, main power supply 110, secondary power supply 120 and chip power supply terminal 130 described above. The input terminal of the power supply control circuit is connected to the main power supply 110 and the secondary power supply 120, and the output terminal of the power supply control circuit is connected to the chip power supply terminal 130. The main power supply 110 supplies power when the power supply control terminal is in standby mode, and the secondary power supply 120 supplies power when the power supply control terminal is in working mode. The first voltage of the main power supply 110 is greater than the second voltage of the secondary power supply 120.

[0045] In this embodiment, the power supply control terminal includes a power supply control circuit, a main power supply 110, a secondary power supply 120, and a chip power supply terminal 130. The input terminal of the power supply control circuit is connected to the main power supply 110 and the secondary power supply 120, and the output terminal of the power supply control circuit is connected to the chip power supply terminal 130. This allows the main power supply 110 and the secondary power supply 120 of the power supply control terminal to selectively supply power to the chip power supply terminal 130. Furthermore, considering that the main power supply 110 supplies power when the power supply control terminal is in standby mode, and the secondary power supply 120 supplies power when the power supply control terminal is in operating mode, and that the first voltage of the main power supply 110 is greater than the second voltage of the secondary power supply 120, the power supply terminal 130 is powered according to the first voltage when the power supply control terminal is in standby mode, and according to the second voltage when the power supply control terminal is in operating mode. This avoids the problem of continuous overheating of the LDO when the power supply terminal enters the operating mode due to the increased load on the chip power supply terminal (i.e., the chip inside the audio product begins to work). In other words, this power supply control method supplies power to the chip power supply terminal 130 based on the first voltage when the power supply control terminal is in standby mode, and supplies power to the chip power supply terminal 130 based on the second voltage when the power supply control terminal is in working mode. The first voltage of the main power supply 110 is greater than the second voltage of the secondary power supply 120, thereby selecting the secondary power supply for power supply in working mode, reducing the input-output voltage difference of the LDO, and solving the problem of continuous heat generation of the LDO in working mode.

[0046] In one embodiment, the secondary power supply 120 is the power supply for the power management integrated circuit in the power supply control terminal. The power management integrated circuit is configured to start outputting the secondary power supply 120 when the power supply control terminal is in operation.

[0047] In this embodiment, the secondary power supply 120 is the power supply for the power management integrated circuit in the power supply control terminal. The power management integrated circuit is configured to start outputting the secondary power supply 120 when the power supply control terminal is in operation. This utilizes the property that the power management integrated circuit in the power supply control terminal only outputs the secondary power supply 120 when the terminal is working, enabling switching to the secondary power supply 120 for power supply during terminal operation. At this time, the secondary power supply 120 can simultaneously serve as a control signal and a power source. Based on the characteristic that the power management integrated circuit starts outputting the secondary power supply 120 when the terminal is working, power switching is achieved when the terminal is in operation, reducing the voltage difference between the LDO input and output sides, thereby improving the LDO's heat generation. Of course, other power supplies that start supplying power during operation can also be used, such as chip A within the terminal, which uses 3V for power supply during operation; in this case, the 3V voltage of that chip can be selected accordingly. Furthermore, different voltage requirements can be met by selecting the voltage needed for different components for power supply switching control.

[0048] The above are only some embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A power supply control circuit, characterized in that, The power supply control circuit is applied to the power supply control terminal. The input terminal of the power supply control circuit is connected to the main power supply and the secondary power supply of the power supply control terminal. The output terminal of the power supply control circuit is connected to the chip power supply terminal of the power supply control terminal. The main power supply provides power when the power supply control terminal is in standby mode, and the secondary power supply provides power when the power supply control terminal is in operating mode. The first voltage of the main power supply is greater than the second voltage of the secondary power supply. The power supply control circuit includes: A first control unit, the first terminal of which is connected to the main power supply, is used to output the first voltage under the control of the main power supply; The second control unit has a first terminal connected to the secondary power supply and a second terminal connected to the second terminal of the first control unit. The second control unit is used to output the second voltage under the control of the secondary power supply and to control the first control unit to stop outputting the first voltage. A voltage regulator unit, wherein a first terminal of the voltage regulator unit is connected to a third terminal of the second control unit and a third terminal of the first control unit, and a second terminal of the voltage regulator unit is connected to a power supply terminal of the chip, wherein the voltage regulator unit is used to supply power to the power supply terminal of the chip according to the first voltage when the power supply control terminal is in standby mode, and to supply power to the power supply terminal of the chip according to the second voltage when the power supply control terminal is in working mode.

2. The power supply control circuit as described in claim 1, characterized in that, The first control unit includes: A first resistor, the first end of which is connected to the main power supply, and the second end of which is connected to the second end of the second control unit; The second resistor has its first end connected to the second end of the first resistor, and its second end grounded. The third resistor, the first end of which is connected to the main power supply; A first capacitor, the first terminal of which is connected to the main power supply, and the second terminal of which is connected to the second terminal of the third resistor; A switching transistor, the first end of which is connected to the main power supply, the second end of which is connected to the second end of the first capacitor, and the third end of which is connected to the first end of the voltage regulator unit and the third end of the second control unit; A fourth resistor, the first end of which is connected to the main power supply, and the second end of which is connected to the third end of the switching transistor; The fifth resistor, the first end of which is connected to the second end of the first capacitor; The first transistor has its first terminal connected to the second terminal of the fifth resistor, its second terminal connected to the second terminal of the first resistor, and its third terminal grounded.

3. The power supply control circuit as described in claim 1, characterized in that, The second control unit includes: A drive control subunit, wherein a first terminal of the drive control subunit is connected to the secondary power supply, and a second terminal of the drive control subunit is connected to the second terminal of the first resistor in the first control unit; A power supply control subunit, wherein the first end of the power supply control subunit is connected to the secondary power supply, and the second end of the power supply control subunit is connected to the third end of the switching transistor in the first control unit.

4. The power supply control circuit as described in claim 3, characterized in that, The drive control subunit includes: The sixth resistor, the first end of which is connected to the secondary power supply; The seventh resistor, the first end of which is connected to the second end of the sixth resistor; The eighth resistor, wherein the first end of the eighth resistor is connected to the second end of the first resistor; The second transistor has its first terminal connected to the second terminal of the eighth resistor, its second terminal connected to the second terminal of the seventh resistor, and its third terminal grounded. The ninth resistor has its first end connected to the second end of the seventh resistor, and its second end is grounded. The second capacitor has its first terminal connected to the second terminal of the seventh resistor, and its second terminal is grounded.

5. The power supply control circuit as described in claim 3, characterized in that, The power supply control subunit includes: The tenth resistor, the first end of which is connected to the secondary power supply; A diode, wherein the anode of the diode is connected to the second terminal of the tenth resistor, and the cathode of the diode is connected to the third terminal of the switching transistor.

6. The power supply control circuit as described in claim 1, characterized in that, The voltage regulator unit includes: A voltage regulator chip, wherein the input terminal of the voltage regulator chip is connected to the cathode of the diode in the second control unit and the third terminal of the switching transistor in the first control unit, and the output terminal of the voltage regulator chip is connected to the power supply terminal of the chip; The third capacitor has its first terminal connected to the input terminal of the voltage regulator chip, and its second terminal grounded. The fourth capacitor has its first terminal connected to the input terminal of the voltage regulator chip, and its second terminal grounded. The fifth capacitor has its first terminal connected to the enable terminal of the voltage regulator chip, and its second terminal grounded. The eleventh resistor has its first end connected to the enable terminal of the voltage regulator chip, and its second end grounded. The twelfth resistor has its first end connected to the output terminal of the voltage regulator chip and its second end connected to the feedback terminal of the voltage regulator chip. The thirteenth resistor has its first end connected to the feedback terminal of the voltage regulator chip, and its second end grounded. The sixth capacitor has its first terminal connected to the output terminal of the voltage regulator chip, and its second terminal grounded. The seventh capacitor has its first terminal connected to the output terminal of the voltage regulator chip, and its second terminal grounded.

7. The power supply control circuit as described in any one of claims 1 to 6, characterized in that, When the power supply control terminal is in standby mode, the main power supply sequentially controls the first transistor and the switching transistor in the first control unit to turn on, and a first power supply path is formed between the main power supply and the first terminal of the voltage regulator unit, so as to use the first voltage to supply power to the power supply terminal of the chip according to the first power supply path.

8. The power supply control circuit as described in any one of claims 1 to 6, characterized in that, When the power supply control terminal is in working state, the secondary power supply controls the second transistor in the second control unit to turn on, so as to control the first transistor and the switching transistor in the first control unit to turn off. The secondary power supply also controls the diode in the second control unit to turn on. A second power supply path is formed between the secondary power supply and the first terminal of the voltage regulator unit, so as to use the second voltage to supply power to the power terminal of the chip according to the second power supply path.

9. A power supply control terminal, characterized in that, The power supply control terminal includes a power supply control circuit, a main power supply, a secondary power supply, and a chip power supply terminal as described in any one of claims 1 to 8. The input terminal of the power supply control circuit is connected to the main power supply and the secondary power supply, and the output terminal of the power supply control circuit is connected to the power supply terminal of the chip. The main power supply provides power when the power supply control terminal is in standby mode, and the secondary power supply provides power when the power supply control terminal is in working mode. The first voltage of the main power supply is greater than the second voltage of the secondary power supply.

10. The power supply control terminal as described in claim 9, characterized in that, The secondary power supply is the power supply for the power management integrated circuit in the power supply control terminal. The power management integrated circuit is configured to start outputting the secondary power supply when the power supply control terminal is in working state.

Images