Power management control circuit and terminal

Abstract

The embodiment of the invention discloses a power management control circuit and a terminal. A first control module, a second control module and a third control module of the power management control circuit are connected in parallel, and the input ends of the first control module, the second control module and the third control module are connected with the output end of power voltage. The first control module is used for controlling power supply voltage input into the first type of devices; the second control module is used for controlling the power supply voltage input into the second type of devices; and the third control module is used for controlling the power supply voltage input into the third-class device. According to the embodiment, the functional devices are divided into three types according to different requirements of different functional devices on power quality and driving voltage, and the three types of functional devices are controlled to output corresponding required power supply voltages through different control modules in the power management control circuit, so that different types of devices are supplied with power in different modes, and the power supply efficiency is improved. The efficiency of converting the power supply voltage into the power supply voltage is higher, thereby reducing the power consumption of the terminal.

Description

Technical Field

[0001] The present embodiment relates to the field of power management technology, and in particular to a power management control circuit and a terminal. Background Art

[0002] Current mobile terminals support more functions and have better performance. At the same time, the power consumption problem of mobile terminals has been further aggravated, resulting in poor user experience. Summary of the invention

[0003] Embodiments of the present application provide a power management control circuit and a terminal.

[0004] The embodiment of the present application provides a power management control circuit. The power management control circuit includes a first control module, a second control module and a third control module. The first control module, the second control module and the third control module are connected in parallel, and the input ends of the first control module, the second control module and the third control module are all connected to the output end of the power supply voltage, the output end of the first control module is connected to the power supply input end of the first type of device, and the first control module is used to control the power supply voltage input to the first type of device; the output end of the second control module is connected to the power supply input end of the second type of device, and the second control module is used to control the power supply voltage input to the second type of device; the output end of the third control module is connected to the power supply input end of the third type of device, and the third control module is used to control the power supply voltage input to the third type of device.

[0005] The embodiment of the present application further provides a terminal. The terminal includes the power management control circuit described in the above embodiment.

[0006] In this way, the power management control circuit and terminal of each embodiment of the present application divide the functional devices into three categories according to the different power quality requirements and driving voltage requirements of different functional devices. In the power management control circuit, the three types of functional devices are controlled by different control modules to output the corresponding required power supply voltage, so that different types of devices are powered in different ways, which makes the power supply voltage converted into the supply voltage more efficient, thereby reducing the power consumption of the terminal.

[0007] Additional aspects and advantages of the present embodiment will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The above and / or additional aspects and advantages of the present embodiment will become apparent and easily understood from the description of the embodiment in conjunction with the following drawings, in which:

[0009] Figure 1is a schematic diagram of the structure of a power management control circuit of certain embodiments of the present application;

[0010] Figure 2 is a schematic diagram of a relationship curve between a dropout voltage of a buck regulator or a voltage reducer and an output current of the buck regulator or the voltage reducer of the present embodiment;

[0011] Figure 3 It is a connection diagram of the internal circuit of the feedback unit in the control module of the power management control circuit of certain embodiments of the present application. DETAILED DESCRIPTION

[0012] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, and the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present invention, and cannot be understood as limiting the embodiments.

[0013] At present, in the related art, the power consumption of mobile terminals is reduced by solving the problem of how to reduce the power consumption of a single functional device in the mobile terminal. However, since the optimization and improvement effect of reducing the power consumption of a single functional device will often sacrifice the overall performance of the product, and the optimization and improvement effect of this method is limited, it does not have an optimization and improvement effect on other functional devices whose power consumption has not been reduced.

[0014] In view of this, please refer to Figure 1 This embodiment provides a power management control circuit 100. The power management control circuit 100 includes a first control module 110, a second control module 120 and a third control module 130. The first control module 110, the second control module 120 and the third control module 130 are connected in parallel.

[0015] The input terminal 111 of the first control module 110 is connected to the output terminal VSYS of the power supply voltage, and the output terminal 112 of the first control module 110 is connected to the power supply input terminal 141 of the first type device 140. The first control module 110 is used to control the power supply voltage input to the first type device 140. The first type device 140 may include one or more devices. Figure 1 As shown in , the first type of devices 140 include functional device 1, functional device 2, functional device 3, functional device 4, functional device 5 or other devices.

[0016] It can be understood that in this embodiment, according to the driving voltage required by the functional devices inside the terminal and the power quality requirements, the functional devices can be divided into three types: those with a smaller driving voltage and higher power quality requirements, those with a larger driving voltage and higher power quality requirements, and those with a smaller driving voltage and lower power quality requirements.

[0017] The first type of device 140 may be a device with a relatively low driving voltage but a relatively high power quality requirement. For example, the first type of device 140 may be an audio device or other device, which is not limited here. Audio devices include speakers, video and sound players, and other devices.

[0018] It can be understood that the quality of power supply can be evaluated by three aspects: power supply ripple, transient response capability and power supply rejection ratio. Small power supply ripple, strong transient response capability and high power supply rejection ratio indicate high power supply quality. On the contrary, large power supply ripple, weak transient response capability and low power supply rejection ratio indicate low power supply quality. Among them, transient response capability refers to the ability of the output voltage of the power supply to change instantly when the switching power supply undergoes a transient load change.

[0019] The input terminal 121 of the second control module 120 is connected to the output terminal VSYS of the power supply voltage, and the output terminal 122 of the second control module 120 is connected to the power supply input terminal 151 of the second type device 150. The second control module 120 is used to control the power supply voltage input to the second type device 150. The second type device 150 may include one or more devices. Figure 1 As shown in FIG, the second type of devices 150 include functional devices 6, functional devices 7, functional devices 8 or other devices.

[0020] The second type device 150 may be a device that has a relatively low driving voltage and relatively low power quality requirements. For example, the second type device 150 may be an antenna radio frequency device or other device, which is not limited here.

[0021] The input terminal 131 of the second control module 130 is connected to the output terminal VSYS of the power supply voltage, and the output terminal 132 of the third control module 130 is connected to the power supply input terminal 161 of the third type device 160. The third control module 130 is used to control the power supply voltage input to the third type device 160. The third type device 160 may include one or more devices. Figure 1 As shown in FIG, the third type of devices 160 include functional devices 9, functional devices 10, functional devices 11 or other devices.

[0022] The third type of device 160 may be a device with a relatively large driving voltage and a relatively high power quality requirement. For example, the second type of device 160 may be a camera, a speed sensor, a light sensor or other devices, which are not limited here.

[0023] It should be noted that Figure 1 It means that the power supply of the mobile terminal supplies power to three types of devices inside the mobile terminal through a battery or USB, outputting the power supply voltage. Then the power supply voltage is supplied to each type of functional device through three paths respectively, making the power supply voltage more efficient in converting into the supply voltage.

[0024] In this way, this embodiment divides the functional devices into three categories according to the different power quality requirements and driving voltage requirements of different functional devices. In the power management control circuit, the three types of functional devices are controlled by different control modules to output the corresponding required power supply voltage, so that different types of devices are powered in different ways, which makes the power supply voltage converted into the supply voltage more efficient, thereby reducing the power consumption of the terminal.

[0025] Please continue reading Figure 1 The first control module 110 includes a first buck 113 and a first buck regulator 114. The first buck 113 is connected in series with the first buck regulator 114. An input terminal 1131 of the first buck 113 is connected to an output terminal VSYS of a power supply voltage, an output terminal 1132 of the first buck 113 is connected to an input terminal 1141 of the first buck regulator 114, and the first buck 113 is used to reduce the power supply voltage to a first voltage. An output terminal 1142 of the first buck regulator 114 is connected to a power supply input terminal 141 of the first type device 140. The first buck regulator 114 is used to reduce the first voltage to a second voltage.

[0026] That is, for the first type device 140, this embodiment can first reduce the power supply voltage through the first buck regulator 113, and then reduce the reduced power supply voltage again through the second buck regulator, thereby outputting a driving voltage with higher power quality and smaller voltage value.

[0027] The first voltage reducer 113 may be a Buck step-down converter composed of a Buck circuit. The basic feature of the Buck circuit is a DC-DC conversion circuit, and the output voltage is lower than the input voltage. The input current is pulsating, and the output current is continuous.

[0028] The first buck regulator 114 can be a low dropout regulator (LDO) composed of an LDO circuit. The principle of a low dropout linear regulator is basically the same as that of a general linear DC regulator, except that the power at the output end of the low dropout regulator is changed from an NPN transistor common collector architecture to a PNP collector open circuit architecture (in terms of using bipolar transistors). Under this architecture, the control electrode of the power transistor in the LDO circuit can put the transistor in a saturated conduction state by utilizing the voltage difference to the ground. Therefore, the input end only needs to be higher than the output end by more than the saturation voltage of the power transistor, and the regulator can operate and stabilize the output voltage. In other words, the input voltage of the LDO circuit must be higher than the output voltage by at least one voltage difference, also known as the dropout voltage, to ensure that the output voltage is constant and stable. In other words, the difference between the power supply voltage and the first voltage is greater than the difference between the first voltage and the second voltage.

[0029] In this way, this embodiment can obtain a power supply voltage suitable for the first type of device after stepping down the power supply voltage through the first buck 113 and the first buck regulator 114, thereby improving the efficiency of converting the power supply voltage into a power supply voltage suitable for the first type of device 140, thereby reducing the power consumption of the first type of device 140, and further reducing the power consumption of the mobile terminal.

[0030] It can be understood that the input voltage V1 of the first buck regulator 114 generally has a variation range, for example, the input voltage can be 1.8-3.6V. If the input voltage of the first buck regulator 114 is fixed to 2.8V and the first buck regulator 114 outputs a current of 10mA, the total resistance value Ron of the first buck regulator 114 is 280Ω, then the normal power consumption P1 of the first buck regulator 114 is 280×(0.01) 2 =0.028W. If the total resistance value of the first buck regulator 114 becomes Ron=2.8Ω, the total resistance value of the first buck regulator 114 is reduced, that is, the first buck regulator 114 becomes a low-load state. At this time, if the first buck regulator 114 still needs to output 10mA current, the power consumption P2 of the first buck regulator 114 becomes 2.8×(0.01) 2 =2.8W, at this time, the power consumption of the internal switch device of the first buck regulator 114 increases under low load. Therefore, when the internal switch device of the first buck regulator 114 is in a low load state, it is necessary to adjust the input voltage of the first buck regulator 114 to be lower than 2.8V, so as to reduce the power consumption of the first buck regulator 114.

[0031] In view of this, the first control module 110 of the present embodiment further includes a first feedback unit 115. A first end of the first feedback unit 115 is connected between an output end 1132 of the first buck regulator 113 and an input end 1141 of the first buck regulator 114, and a second end of the first feedback unit 115 is connected between an output end 1142 of the first buck regulator 114 and a power supply input end 141 of the first type device 140.

[0032] The first feedback unit 115 is used to determine a first difference d1=V2-Va between the output voltage V2 of the first buck regulator 114 (i.e., the supply voltage of the first type device 140) and the driving voltage Va of the first type device 140. If the first difference d1 is less than the first threshold Va1, a first feedback signal is output to reduce the input voltage V1 of the first buck regulator 114. If the first difference d1 is greater than the first threshold Va1, a second feedback signal is output to increase the input voltage V1 of the first buck regulator 114.

[0033] That is, this embodiment sets the first feedback unit 115 in the power management control circuit 100, and controls the input voltage V1 of the first buck regulator 114 to be reduced or increased in real time through the feedback signal output by the first feedback unit 115, thereby dynamically adjusting the power consumption of the first buck regulator 114 and improving the working efficiency of the first buck regulator 114.

[0034] The first threshold Va1 is a value determined in advance based on experimental research. For example, the first threshold Va1 may be 0.01mV, 0.011mV, 0.012mV, 0.013mV, 0.015mV, 0.018mV, 0.019mV, 0.02mV, 0.023mV, 0.024mV or other values, which are not limited here.

[0035] Understandably, relevant studies have shown that under a constant ambient temperature (eg, 25° C.), the dropout voltage Dropout of the first buck regulator 114 and the output current I1 of the first buck regulator 114 are linearly positively correlated (eg, Figure 2 As shown), because the first difference d1 between the output voltage V2 of the first buck regulator 114 and the driving voltage Va of the first type device 140 is equal to V2-Va, that is, the first difference d1 can reflect the relationship between the output current I1 of the first buck regulator 114 and the input current I2 of the first type device 140.

[0036] Among them, the input current I2 of the first type device 140 defaults to a fixed value. For example, the input current I2 can be 8mA, 8.5mA, 9mA, 10mA, 10.5mA, 11mA, 12mA, 13mA, 13.5mA or 14mA, or other values, which are not limited here.

[0037] In detail, when the first difference d1 is the first threshold Va1, it indicates that the output current I1 of the first buck regulator 114 is normal, the drop voltage Dropout of the first buck regulator 114 is normal, and the power consumption of the first buck regulator 114 is normal.

[0038] When the first difference d1 increases, it indicates that the output current I1 of the first buck regulator 114 increases, and the drop voltage Dropout of the first buck regulator 114 also increases. Correspondingly, the input voltage V1 of the first buck regulator 114 needs to be increased to ensure the normal operation of the first buck regulator 114.

[0039] When the first difference d1 decreases, it indicates that the output current I1 of the first buck regulator 114 decreases, and the drop voltage Dropout of the first buck regulator 114 also decreases. Correspondingly, it is necessary to reduce the input voltage V1 of the first buck regulator 114, thereby reducing the power consumption of the first buck regulator 114 and improving the working efficiency of the first buck regulator 114.

[0040] Therefore, the present application can dynamically adjust the input voltage V1 of the first buck regulator 114 according to the first difference d1 to dynamically adjust the power consumption of the first buck regulator 114 and improve the working efficiency of the first buck regulator 114 .

[0041] In this way, this embodiment can realize adaptive regulation of the input voltage V1 of the first buck regulator 114 through the feedback signal of the first feedback unit 115 to dynamically adjust the power consumption of the first buck regulator 114 and improve the working efficiency of the first buck regulator 114.

[0042] See also Figure 1, the first control module 110 further includes a second feedback unit 116. A first end of the second feedback unit 116 is connected between the output end VSYS of the power supply voltage and the input end 1131 of the first buck 113, and a second end of the second feedback unit 116 is connected between the output end 1132 of the first buck 113 and the input end 1141 of the first buck regulator 114. The second feedback unit 116 is used to determine a second difference d2 between the output voltage V4 of the first buck 113 and the input voltage V1 of the first buck regulator 114. If the second difference d2 is less than the second threshold Va2, a third feedback signal is output to reduce the input voltage V3 of the first buck 113. If the second difference d2 is greater than the second threshold Va2, a fourth feedback signal is output to increase the input voltage V3 of the first buck 113.

[0043] The second threshold Va2 is also a value determined in advance based on experimental research. The second threshold Va2 may be equal to or different from the first threshold Va1, and there is no limitation here.

[0044] It can be understood that relevant research shows that the drop voltage Dropout of the first buck 113 is also linearly positively correlated with the output current I2 of the first buck 113, because the second difference d2 between the output voltage V3 of the first buck 113 and the input voltage V1 of the first buck regulator 114 is d3-V1, that is, the second difference d2 can reflect the relationship between the output current I3 of the first buck 113 and the input current I1 of the first buck regulator 114.

[0045] At this time, the input current I1 of the first buck regulator 114 may be assumed to be a fixed value, for example, the input current I1 may be 14 mA, 14.5 mA, 15 mA, 16 mA, 16.5 mA, 17 mA, 18 mA, 19 mA, 19.5 mA or 20 mA, or other values, which are not limited here.

[0046] In detail, when the second difference d2 is the second threshold Va2, it indicates that the output current I1 of the first buck 113 is normal, the drop voltage Dropout of the first buck 113 is normal, and the power consumption of the first buck 113 is normal.

[0047] When the second difference d2 increases, it means that the output current I3 of the first buck 113 increases, and the drop voltage Dropout of the first buck 113 also increases. Correspondingly, the input voltage V1 of the first buck 113 needs to be increased to ensure the normal operation of the first buck 113.

[0048] When the second difference d2 decreases, it means that the output current I3 of the first buck 113 decreases, and the drop voltage Dropout of the first buck 113 also decreases. Correspondingly, the input voltage V1 of the first buck 113 needs to be reduced, thereby reducing the power consumption of the first buck 113 and improving the working efficiency of the first buck 113.

[0049] Therefore, similarly, this embodiment can realize adaptive regulation of the input voltage V3 of the first buck 113 through the feedback signal of the second feedback unit 116, so as to dynamically adjust the power consumption of the first buck 113 and improve the working efficiency of the first buck 113.

[0050] The second control module 120 includes a second buck 123, an input terminal 1231 of the second buck 123 is connected to the output terminal VSYS of the power supply voltage, and an output terminal 1231 of the second buck 123 is connected to the power supply input terminal 151 of the second type device 150. The second buck 123 is used to reduce the power supply voltage to a third voltage.

[0051] The second voltage reducer 123 may be a Buck converter, that is, at this time, the difference between the power supply voltage and the third voltage is relatively large.

[0052] That is, the power management control circuit 100 of this embodiment can achieve a voltage reduction effect on the power supply voltage through the second voltage reducer 123 to ensure normal power supply to the second type device 150 .

[0053] The second control module 120 further includes a third feedback unit 124. A first end of the third feedback unit 124 is connected between the output end VSYS of the power supply voltage and the input end 1231 of the second buck 123, and a second end of the third feedback unit 124 is connected between the output end 1232 of the second buck 123 and the power supply input end 151 of the second type device 150.

[0054] The third feedback unit 124 is used to determine a third difference d3 between the output voltage V6 of the second buck 123 and the driving voltage Vb of the second type device 150. If the third difference d3 is less than the third threshold value Vb1, a fifth feedback signal is output to reduce the input voltage V5 of the second buck 123. If the third difference d3 is greater than the third threshold value Vb1, a sixth feedback signal is output to increase the input voltage V5 of the second buck 123.

[0055] The third threshold Vb1 is a value determined in advance based on experimental research. The third threshold Vb1 can be, for example, 0.1mV, 0.11mV, 0.12mV, 0.13mV, 0.15mV, 0.18mV, 0.19mV, 0.2mV, 0.23mV, 0.24mV or other values, which are not limited here.

[0056] As for the specific reason why the present embodiment can dynamically adjust the input voltage V5 of the second buck 123 according to the third difference d3, please refer to the above explanation of the first buck 113, and no limitation is made here.

[0057] In this way, this embodiment sets a third feedback unit 124 in the power management control circuit 100, and uses the feedback signal output by the third feedback unit 124 to control in real time to reduce the input voltage V5 of the second buck 123 or increase the input voltage V5 of the second buck 123, thereby dynamically adjusting the power consumption of the second buck 153 and improving the working efficiency of the second buck 153.

[0058] The third control module 130 includes a second buck regulator 133. An input terminal 1331 of the second buck regulator 133 is connected to an output terminal VSYS of a power supply voltage, an output terminal 1332 of the second buck regulator 133 is connected to a power supply input terminal 161 of the third type device 160, and the second buck regulator 133 is used to reduce the power supply voltage to a fourth voltage.

[0059] The second buck regulator 133 may be a low voltage drop linear regulator, that is, the difference between the power supply voltage and the fourth voltage is relatively small.

[0060] That is, the power management control circuit 100 of this embodiment can achieve the function of stepping down and stabilizing the power supply voltage through the second step-down regulator 133 , thereby ensuring the normal power supply to the third type device 160 .

[0061] The third control module 130 further includes a fourth feedback unit 134. A first end of the fourth feedback unit 134 is connected between the output end VSYS of the power supply voltage and the input end 1331 of the second buck regulator 133, and a second end of the fourth feedback unit 134 is connected between the output end 1332 of the second buck regulator 133 and the power supply input end 161 of the third type device 160.

[0062] The fourth feedback unit 134 is used to determine a fourth difference d4 between the output voltage V8 of the second buck regulator 133 and the driving voltage Vc of the third type device. If the fourth difference d4 is less than the fourth threshold value Vc1, a fifth feedback signal is output to reduce the input voltage V7 of the second buck regulator 133. If the fourth difference d4 is greater than the fourth threshold value Vc1, a sixth feedback signal is output to increase the input voltage V7 of the second buck regulator 133.

[0063] The fourth threshold Vc1 is a value determined in advance based on experimental research. The fourth threshold Vc1 can be, for example, 0.01mV, 0.011mV, 0.013mV, 0.014mV, 0.015mV, 0.018mV, 0.019mV, 0.02mV, 0.023mV, 0.028mV or other values, which are not limited here.

[0064] As for the specific reason why the present embodiment can dynamically adjust the input voltage V7 of the second buck regulator 133 according to the fourth difference d4, please refer to the above explanation of the first buck regulator 114, and no limitation is made here.

[0065] In this way, this embodiment sets the fourth feedback unit 134 in the power management control circuit 100, and controls the reduction of the input voltage V7 of the second buck regulator 133 or the increase of the input voltage V7 of the second buck regulator 133 in real time through the feedback signal output by the fourth feedback unit 134, thereby dynamically adjusting the power consumption of the second buck regulator 133 and improving the working efficiency of the second buck regulator 133.

[0066] See also Figure 2 In this embodiment, the feedback unit described in any of the above embodiments includes a test resistor R, a first current detector A1, a second current detector A2 and a comparison amplifier Q.

[0067] The test resistor R is connected in series between the buck and the buck regulator, between the buck and the device, or between the buck regulator and the device. Figure 2 In the description, an example is given in which the test resistor R is connected between the first buck regulator and the first type of device.

[0068] The first end of the first current detector A1 is connected to the first end 1 of the test resistor R. The first current detector A1 is used to detect a first current value I at the first end 1 of the test resistor R. R1 .

[0069] The second end of the second current detector A2 is connected to the second end 2 of the test resistor R. The second current detector A2 is used to detect a second current value I at the second end of the test resistor R. R2 .

[0070] The comparison amplifier Q is used to calculate the current value I R1 , the second current value I R2 The first voltage value U1 and the second voltage value U2 are calculated and obtained by the resistance value of the test resistor R, and the difference d between the first voltage value U1 and the second voltage value U2 is determined. Then, according to the difference d, a feedback signal is output to control the input voltage V of the buck or buck regulator connected before the test resistor R to increase or decrease.

[0071] That is to say, the comparison amplifier Q can convert the first current value I R1 and the second current value I R2 After proportional amplification, the first voltage value U1 and the second voltage value U2 are calculated to determine the voltage difference d across the test resistor, and then a feedback electrical signal is output according to the difference d to adjust the input voltage V of the buck or buck regulator connected before the test resistor R, thereby dynamically adjusting the power consumption of the buck or buck regulator and improving the working efficiency of the buck or buck regulator.

[0072] In particular, when a buck regulator is connected before the test resistor R, the voltage difference between the input voltage and the output voltage of the buck regulator is small. Therefore, the comparison amplifier Q can obtain the first voltage value U1 and the second voltage value U2 after proportional amplification, which is more conducive to calculating the difference d.

[0073] In one embodiment of the present application, the comparison amplifier Q is used to output a feedback signal to control the input voltage of the buck or buck regulator to decrease if the difference d is less than a preset threshold value, and to output a feedback signal to control the input voltage of the buck or buck regulator to increase if the difference d is greater than the preset threshold value.

[0074] That is, this embodiment can determine whether to increase or decrease the input voltage of the buck or buck regulator by comparing the voltage difference d across the test resistor R with the same preset threshold value, thereby dynamically adjusting the power consumption of the buck or buck regulator and improving the working efficiency of the buck or buck regulator.

[0075] The preset threshold is a value determined in advance based on experimental research. The preset threshold may be, for example, 0.01mV, 0.011mV, 0.012mV, 0.013mV, 0.015mV, 0.018mV, 0.019mV, 0.02mV, 0.023mV, 0.024mV or other values, which are not limited here. The preset threshold may refer to, for example, the first threshold Va1, the second threshold Va2, the third threshold Vb1 and the fourth threshold Vc1 mentioned above.

[0076] The selected value of the preset threshold value is related to the accuracy of the comparison amplifier Q. If the accuracy of the comparison amplifier Q is accurate to 0.01, the preset threshold value can be selected as 0.01mV, and if the accuracy of the comparison amplifier Q is accurate to 0.001, the preset threshold value can be selected as 0.001mV.

[0077] More specifically, if the preset threshold is 0.01 mV, the current difference (I R1 -I R2) is 300mV. That is to say, when it is detected that the current difference across the test resistor R is less than 300mV, the voltage difference d across the test resistor R is less than the preset threshold value 0.01mV. When it is detected that the current difference across the test resistor R is greater than 300mV, the voltage difference d across the test resistor R is greater than the preset threshold value 0.01mV.

[0078] In addition, in another embodiment of the present application, the comparison amplifier Q is further used to output a feedback signal to control the input voltage of the buck or buck regulator to decrease if the difference d is less than the first preset threshold value Ua1. If the difference d is greater than the second preset threshold value Ua2, the comparison amplifier Q is used to output a feedback signal to control the input voltage of the buck or buck regulator to increase, wherein the second preset threshold value Ua2 is greater than the first preset threshold value Ua1.

[0079] Among them, the first preset threshold value Ua1 and the second preset threshold value Ua2 are both values ​​determined in advance based on experimental research. For example, the first preset threshold value Ua1 is 0.01mV, and Ua2 can be 0.02mV. When d is 0.005mV, d is less than the first preset threshold value 0.01mV, so at this time the comparison amplifier Q will output a feedback signal to control the input voltage of the buck or buck regulator to decrease, so as to reduce the power consumption of the buck or buck regulator. When d is 0.025mV, d is greater than 0.02mV, so at this time the comparison amplifier Q will output a feedback signal to control the input voltage of the buck or buck regulator to increase, so as to ensure the normal operation of the buck or buck regulator.

[0080] That is to say, in addition to being compared with a specific threshold, the difference d1 of the present embodiment can also be compared with a threshold within a specific range of the first preset threshold Ua1 and the second preset threshold Ua2, so as to determine whether it is necessary to adjust the input voltage of the buck or buck regulator, so as to dynamically adjust the power consumption of the buck or buck regulator and improve the working efficiency of the buck or buck regulator.

[0081] This embodiment further provides a terminal. The terminal includes any one of the power management control circuits in the above embodiments. The terminal in this embodiment can be, for example, a mobile phone, a computer, an iPad, a car or other electronic devices.

[0082] In this way, the terminal of this embodiment divides the functional devices into three categories according to the different power quality requirements and driving voltage requirements of different functional devices. In the power management control circuit of the terminal, the three types of functional devices are controlled by different control modules to output the corresponding required power supply voltage, so that different types of devices are powered in different ways, which makes the power supply voltage converted into the supply voltage more efficient, thereby reducing the power consumption of the mobile terminal.

Claims

1. A power management control circuit, characterized in that: The power management control circuit includes a first control module, a second control module and a third control module, wherein the first control module, the second control module and the third control module are connected in parallel, and input ends of the first control module, the second control module and the third control module are all connected to the output end of the power supply voltage. The output end of the first control module is connected to the power supply input end of the first type of device, and the first control module is used to control the power supply voltage input to the first type of device; The output end of the second control module is connected to the power supply input end of the second type of device, and the second control module is used to control the power supply voltage input to the second type of device; The output end of the third control module is connected to the power supply input end of the third type device, and the third control module is used to control the power supply voltage input to the third type device.

2. The power management control circuit according to claim 1, characterized in that: The first control module includes a first buck and a first buck regulator, the first buck is connected in series with the first buck regulator, the input end of the first buck is connected to the output end of the power supply voltage, the output end of the first buck is connected to the input end of the first buck regulator, the first buck is used to reduce the power supply voltage to a first voltage; the output end of the first buck regulator is connected to the power supply input end of the first type of device, and the first buck regulator is used to reduce the first voltage to a second voltage.

3. The power management control circuit according to claim 2, characterized in that: The first control module further includes a first feedback unit, a first end of the first feedback unit is connected between the output end of the first buck regulator and the input end of the first buck regulator, and a second end of the first feedback unit is connected between the output end of the first buck regulator and the power supply input end of the first type of device; The first feedback unit is used for: determining a first difference between an output voltage of the first buck regulator and a driving voltage of the first type of device; If the first difference is less than a first threshold, outputting a first feedback signal to reduce the input voltage of the first buck regulator; If the first difference is greater than the first threshold, a second feedback signal is output to increase the input voltage of the first buck regulator.

4. The power management control circuit according to claim 2, characterized in that: The first control module further includes a second feedback unit, a first end of the second feedback unit is connected between the output end of the power supply voltage and the input end of the first buck, and a second end of the second feedback unit is connected between the output end of the first buck and the input end of the first buck regulator; The second feedback unit is used for: determining a second difference between an output voltage of the first buck regulator and an input voltage of the first buck regulator; If the second difference is less than a second threshold, outputting a third feedback signal to reduce the input voltage of the first buck; If the second difference is greater than the second threshold, a fourth feedback signal is output to increase the input voltage of the first buck.

5. The power management control circuit according to claim 1, characterized in that: The second control module includes a second buck, the input end of the second buck is connected to the output end of the power supply voltage, the output end of the second buck is connected to the power supply input end of the second type device, and the second buck is used to reduce the power supply voltage to a third voltage.

6. The power management control circuit according to claim 5, characterized in that: The second control module further includes a third feedback unit, a first end of the third feedback unit is connected between the output end of the power supply voltage and the input end of the second buck, and a second end of the third feedback unit is connected between the output end of the second buck and the power supply input end of the second type device; The third feedback unit is used for: determining a third difference between the output voltage of the second buck and the driving voltage of the second type of device; If the third difference is less than a third threshold, outputting a fifth feedback signal to reduce the input voltage of the second buck; If the third difference is greater than the third threshold, a sixth feedback signal is output to increase the input voltage of the second buck.

7. The power management control circuit according to claim 1, characterized in that: The third control module includes a second buck regulator, the input end of the second buck regulator is connected to the output end of the power supply voltage, the output end of the second buck regulator is connected to the power supply input end of the third type device, and the second buck regulator is used to reduce the power supply voltage to a fourth voltage.

8. The power management control circuit according to claim 7, characterized in that: The third control module further includes a fourth feedback unit, a first end of the fourth feedback unit is connected between the output end of the power supply voltage and the input end of the second buck regulator, and a second end of the fourth feedback unit is connected between the output end of the second buck regulator and the power supply input end of the third type device; The fourth feedback unit is used for: determining a fourth difference between an output voltage of the second buck regulator and a driving voltage of the third type device; If the fourth difference is less than a fourth threshold, outputting a fifth feedback signal to reduce the input voltage of the second buck regulator; If the fourth difference is greater than the fourth threshold, a sixth feedback signal is output to increase the input voltage of the second buck regulator.

9. The power management control circuit according to any one of claims 3, 4, 6 or 8, characterized in that: The feedback unit includes a test resistor, a first current detector, a second current detector and a comparison amplifier. The test resistor is connected in series between the buck and the buck regulator, between the buck and the device, or between the buck regulator and the device; A first end of the first current detector is connected to a first end of the test resistor, and the first current detector is used to detect a first current value of the first end of the test resistor; The second end of the second current detector is connected to the second end of the test resistor, and the second current detector is used to detect a second current value of the second end of the test resistor; The comparison amplifier is used to calculate and obtain a first voltage value and a second voltage value according to the first current value, the second current value and the resistance value of the test resistor, and determine the difference between the first voltage value and the second voltage value; According to the difference output feedback signal, the input voltage of the buck or the buck regulator connected before the test resistor is controlled to increase or decrease.

10. The power management control circuit according to claim 9, characterized in that: The comparator amplifier is used to: If the difference is less than a preset threshold, outputting a feedback signal to control the input voltage of the buck or the buck regulator to decrease; If the difference is greater than the preset threshold, a feedback signal is output to control the input voltage of the buck converter or the buck regulator to increase.

11. The power management control circuit according to claim 9, characterized in that: The comparator amplifier is also used for: If the difference is less than a first preset threshold, outputting a feedback signal to control the input voltage of the buck or the buck regulator to decrease; If the difference is greater than a second preset threshold, a feedback signal is output to control the input voltage of the buck or the buck regulator to increase, wherein the second preset threshold is greater than the first preset threshold.

12. A terminal, characterized in that: The terminal comprises the power management control circuit according to any one of claims 1-11.

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