CN111987754A - Mobile device and control method for supplying power to load - Google Patents
Mobile device and control method for supplying power to load Download PDFInfo
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- CN111987754A CN111987754A CN201910439538.5A CN201910439538A CN111987754A CN 111987754 A CN111987754 A CN 111987754A CN 201910439538 A CN201910439538 A CN 201910439538A CN 111987754 A CN111987754 A CN 111987754A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
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Abstract
A mobile device and a method of controlling power to a load are disclosed. The mobile device includes a load powered by a battery; a switch connected between the battery and the load; a detection circuit that detects the battery voltage and generates a result signal, the detection circuit setting the result signal to a first level if the battery voltage is greater than a preset reference, the detection circuit setting the result signal to a second level if the battery voltage is less than the preset reference; and a control circuit for controlling the switch according to the result signal, wherein the control circuit turns on the switch when the result signal is at a first level, starts timing when the result signal is changed from the first level to a second level, and turns off the switch if the result signal is at the second level when a preset time interval from the timing of starting timing is over. The movable equipment can judge whether the large load current appears transiently or not so as to decide whether to cut off the load power supply or not, thereby avoiding unnecessary system power-off and equipment shutdown phenomena.
Description
Technical Field
The present invention relates to the field of batteries, and more particularly to a mobile device and a method of controlling the powering of a load, for example in a device.
Background
In a mobile device such as a cell phone, smart band, smart watch, tablet, etc., the system load (e.g., including the display screen, microcontroller, etc.) may be powered by a battery. Since the power supplied by the battery has an upper limit, the battery voltage is pulled down when the system load increases to a certain level (e.g., the current consumed by the system load increases to a certain level). When the battery voltage is pulled down to be less than the minimum value of the normal operating voltage of the system load, the system load cannot work effectively and a system power-off phenomenon may occur, so that the mobile device is shut down. Therefore, in the prior art removable devices, even a brief occurrence of a large load current may result in unnecessary system load outages and device shutdowns.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a mobile device and a method for controlling power supply to a load, which are used to determine whether a large load current appears is transient or not, so as to determine whether to disconnect the power supply to the load, thereby avoiding unnecessary system power-off and device shutdown phenomena.
To solve the above technical problem, the present invention provides a mobile device, including: a load powered by a battery; a switch connected between the battery and the load; a detection circuit for detecting a battery voltage of the battery and generating a result signal, wherein the detection circuit sets the result signal to a first level if the battery voltage is greater than a preset reference, and sets the result signal to a second level if the battery voltage is less than the preset reference; and a control circuit connected to the switch and the detection circuit, for controlling the switch according to the result signal, wherein when the result signal is at the first level, the control circuit turns on the switch, when the result signal is changed from the first level to the second level, the control circuit starts timing, and if the result signal is at the second level at the end of a preset time interval from the timing when the timing is started, the control circuit turns off the switch.
The invention also provides a control method for supplying power to a load, which comprises the following steps: powering the load with a battery; detecting a battery voltage of the battery with a detection circuit to generate a result signal; controlling, with a control circuit, a switch connected between the battery and the load according to the result signal; if the battery voltage is greater than a preset reference, setting the result signal to be a first level to control the control circuit to conduct the switch; if the battery voltage is smaller than the preset reference, setting the result signal as a second level to control the control circuit to start timing; and if the result signal is the second level at the end of a preset time interval from the time when the timing is started, the control circuit turns off the switch.
The mobile device and the control method provided by the invention can start timing when the battery voltage is detected to be reduced to be smaller than the preset reference, and judge whether the battery voltage reduction condition lasts for the preset time interval, thereby judging whether to disconnect the load and the battery. Thus, unnecessary power-off and shutdown phenomena present in prior art removable devices are avoided.
Drawings
Further objects, specific structural features and advantages of the present invention will be understood from the following description of some embodiments of the invention, taken in conjunction with the accompanying drawings.
FIG. 1A is a block diagram of a removable device according to one embodiment of the present invention.
FIG. 1B is a block diagram of a removable device, according to one embodiment of the present invention.
FIG. 1C is a block diagram of a removable device, according to one embodiment of the present invention.
FIG. 2 is a block diagram of a removable device according to one embodiment of the present invention.
FIG. 3 is a block diagram of a removable device according to one embodiment of the present invention.
Fig. 4 is a flowchart illustrating a control method for controlling power supply to a load according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention. While the invention is illustrated and described in connection with these embodiments, it is to be understood that the invention is not limited to these embodiments. On the contrary, the invention is intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the invention as defined by the appended claims.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
The embodiment of the invention provides a mobile device, which starts timing when detecting that the voltage (such as a battery voltage) of a power supply battery for a system load is reduced to be less than a preset reference (such as the minimum normal working voltage of the system load), and judges whether the condition of the battery voltage reduction lasts for a preset time interval, so as to judge whether the power supply battery can not continuously and effectively supply power for the system load. The removable device decides whether to disconnect the system load and the battery according to the result of the judgment. Thus, unnecessary power-off and shutdown phenomena present in prior art removable devices are avoided.
FIG. 1A is a block diagram of a removable device 100A according to one embodiment of the present invention. As shown, the removable device 100A includes a battery 110, a system load 114, a switch 112 coupled between the battery 110 and the load 114, a detection circuit 158 coupled to the battery 110, and a control circuit 102 coupled to the switch 112 and the detection circuit 158. The removable device 100A may also include a power selection circuit 118. The battery 110 may be, but is not limited to, a rechargeable battery (e.g., a lithium ion battery, a lithium polymer battery, etc.). The system load 114 may include, but is not limited to, a display screen, a microcontroller, and other functional modules. The control circuit 102 may include, but is not limited to, a control logic circuit.
In one embodiment, battery 110 supplies power to system load 114 through switch 112. The detection circuit 158 detects the voltage V of the battery 110BATTo judge the battery voltage VBATWhether or not it is less than a preset reference VPRE(not shown in the figure) and produces a resulting signal SHYS. Wherein a reference V is presetPREDetermined by the minimum normal operating voltage of the system load 114. If the battery voltage VBATGreater than a predetermined reference VPREThen the detection circuit 158 sets the result signal SHYSAt a first level (e.g., a logic high level or a logic low level). If the battery voltage VBATLess than a predetermined reference VPREThen the detection circuit 158 sets the result signal SHYSAt a second level (e.g., a logic low level or a logic high level). The control circuit 102 is based on the result signal SHYSControlling the switch 112. When the resulting signal SHYSAt said first level (e.g. representing the battery voltage V)BATHigh enough for system load 114 to operate properly) control circuit 102 turns on switch 112. When the resulting signal SHYSUpon transitioning from the first level to the second level (e.g., indicating a greater increase in system load 114, battery voltage VBATPulled low so that the system load does not work effectively), the timing module in the control circuit 102 starts timing. During the timing, the system load 114 may still be operating. If the result signal S ends at a predetermined time interval DeltaT from the time of starting the timing HYSAnd still at the second level (e.g., indicating that the system load 114 is indeed in an overload condition or that the battery 110 is indeed unable to provide sufficient power to the system load 114), the control circuit 102 turns off the switch 112, which powers down the system load 114 to protect the removable device 100A and/or the battery 110. Or, if the knot is made before the end of said preset time interval Δ TFruit signal SHYSHaving returned to the first level (e.g., indicating that the system load 114 is fluctuating briefly), the control circuit 102 keeps the switch 112 conductive. Therefore, in the removable device 100A of the embodiment of the present invention, if a brief large load current occurs, the system load 114 still operates, and the power-off and shutdown phenomena existing in the removable device of the related art are avoided.
More specifically, in the embodiment of FIG. 1A, the detection circuit 158 includes a reference voltage source 108 (e.g., a bandgap reference voltage source), a voltage sensing circuit 106 (e.g., a resistive divider), and a comparator 104 (e.g., a hysteresis comparator) coupled to the reference voltage source 108 and the voltage sensing circuit 106. The reference voltage source 108 provides a reference voltage VREF. The voltage sensing circuit 106 is coupled to the battery 110 and generates an indication of the battery voltage V BATInduced signal V ofSEN. The comparator 104 will sense the signal VSENAnd a reference voltage VREFComparing and generating the result signal SHYS. More specifically, in one embodiment, if the sense signal V isSENGreater than a reference voltage VREFThen represents the battery voltage VBATGreater than the above-mentioned predetermined reference VPREAnd the comparator 104 generates the resulting signal S having the first level on the signal line 112HYS(ii) a If the sensing signal V isSENLess than reference voltage VREFThen represents the battery voltage VBATLess than a predetermined reference VPREAnd the comparator 104 generates the resulting signal S having the above-mentioned second level on the signal line 122HYS. Preset reference VPREMay be set equal to or slightly greater than the minimum value of the normal operating voltage of system load 114. When the battery voltage VBATLess than a predetermined reference VPREWhen it is determined that the current battery voltage V is presentBATInsufficient for system load 114 to operate efficiently.
In one embodiment, comparator 104 comprises a hysteretic comparator that enables its output signal (e.g., resulting signal S)HYS) Is relatively stable. The control circuit 102 receives the result signal S from the hysteresis comparator 104HYS. If the control circuit 102 detects the result signal SHYSAt the first level, the control circuit 102 generates the control signal S on the signal line 116 CTLTo turn on the switch 112. If the control circuit 102 detects the result signal SHYSTransitioning from the first level to the second level (e.g., indicating a greater increase in the system load 114), the timing module in the control circuit 102 begins timing. If the control circuit 102 detects the result signal S before the end of the preset time interval DeltaTHYSTransitioning from the second level to the first level, the control circuit 102 terminates the timing and continues to turn on the switch 112. If at the end of the preset time interval Δ T, the resulting signal SHYSStill at the second level, the control circuit 102 sets the control signal SCTLTo turn off the switch 112.
In the embodiment of fig. 1A, the detection circuit 158 and the control circuit 102 are powered directly by the battery 110, and the minimum value of the normal operating voltage of the detection circuit 158 and the minimum value of the normal operating voltage of the control circuit 102 are less than the minimum value of the normal operating voltage of the system load 114. Thus, at the battery voltage VBATLess than the minimum value of the normal operating voltage of the system load 114, provided that the battery voltage V is less thanBATGreater than the minimum of the normal operating voltage of the detection circuit 158 and the control circuit 102, the detection circuit 158 and the control circuit 102 can still operate effectively. However, the present invention is not limited thereto. In other embodiments, the detection circuitry 158 and the control circuitry 102 are powered by other power sources.
FIG. 1B is a block diagram of a removable device 100B according to one embodiment of the present invention. FIG. 1B is described below in conjunction with FIG. 1A. In the embodiment of FIG. 1B, the removable device 100B also includes power selection circuitry 118. The power selection circuit 118 may receive the battery voltage VBATAnd other voltage sources. More specifically, the removable device 100B may include a low dropout linear regulator and/or other type of regulated output voltage source for powering some low power consuming functional blocks. The power selection circuit 118 may receive the battery voltage VBATOutput voltage V of low dropout linear regulatorLDOLow power consumption functional moduleSupply voltage V of the blockDDAnd/or other types of voltage source output voltage VOTHERAnd selects a supply voltage V for powering the detection circuit 158 and the control circuit 102 from the plurality of voltages based on the system conditions in the removable device 100BSPL。
FIG. 1C is a block diagram of a removable device 100C according to one embodiment of the present invention. Fig. 1C is described below in conjunction with fig. 1A and 1B. If 1C is shown, the detection circuitry 158 and the control circuitry 102 are powered by the power supply circuitry 128. For example, the power supply circuit 128 may include the power cord 130 shown in FIG. 1A that connects the battery 110 with the detection circuit 158 and the control circuit 102. By way of further example, the power supply circuit 128 may include the power supply selection circuit 118 shown in FIG. 1B. As another example, the power supply circuit 128 may include a storage circuit or element for storing a predetermined amount of electrical energy at the battery voltage V BATIs reduced to be less than the preset reference VPREPower is supplied to the detection circuit 158 and the control circuit 102. The energy stored in the energy storage circuit or the energy storage element is available to the detection circuit 158 and the control circuit 102 for a time period greater than the predetermined time interval Δ T. Further, in another implementation, the power supply circuit 128 may include other types of circuits and/or components, and may be at the battery voltage VBATIs reduced to be less than the preset reference VPREIt is possible to power the detection circuitry 158 and the control circuitry 102.
FIG. 2 is a block diagram of a removable device 200 according to one embodiment of the present invention. Fig. 2 is described below in conjunction with fig. 1A, 1B, and 1C. In the embodiment of fig. 2, the control circuit 202 and the power supply circuit 228 are similar in structure and function to the control circuit 102 and the power supply circuit 128 described above, and therefore will not be described repeatedly.
In one embodiment, the detection circuit 258 includes the voltage sensing circuit 106 and the comparison circuit 204. The voltage sensing circuit 106 generates an indication of the battery voltage VBATInduced signal V ofSEN. The comparison circuit 204 will sense the signal VSENAnd a reference voltage VREFComparing to determine the battery voltage VBATWhether or not less than a preset valueExamination VPRE. For example, the comparison circuit 204 includes a first transistor, a second transistor, a first bias element, a second bias element, and a reference terminal 220 (e.g., a ground reference terminal). The first transistor includes a first terminal, a second terminal, and a control terminal. Wherein, the control terminal of the first transistor is connected to the voltage sensing circuit 106 for receiving the sensing signal V SENThe first terminal of the first transistor is connected to the power supply circuit 228 via the first bias element, and the second terminal thereof is connected to the reference terminal 220. The second transistor also includes a first terminal, a second terminal, and a control terminal. The control terminal of the second transistor is connected to the first transistor, the first terminal of the second transistor is connected to the power supply circuit 228 through the second bias element, and the second terminal of the second transistor is connected to the reference terminal 220. Thus, the conductive state of the second transistor may control the resulting signal SHYS。
Taking fig. 2 as an example, the first transistor 244 and the second transistor 246 may include N-type metal oxide semiconductor field effect transistors. The first and second biasing components 240, 242 may comprise resistors or current sources. Gate G of first transistor 2441(e.g., control terminal) connected to the voltage sensing circuit 106, and a drain D1A first terminal connected to the power supply circuit 228 via a first bias element 240 (e.g., a resistor or a current source), and a source S1(e.g., a second end) is coupled to reference end 254. G of the second transistor 2462A gate (e.g., control terminal) and a drain D of the first transistor 2441Connected, the drain D of the second transistor 246 2A first terminal coupled to the power supply circuit 228 via a second biasing element 242 (e.g., a resistor or a current source), and a source S2(e.g., a second end) is coupled to reference end 220. When the gate G of the first transistor 2441Voltage (e.g. induced signal V)SEN) Greater than a reference voltage VREFSo that the gate-source voltage V of the first transistor 244GSGreater than its turn-on threshold VTHWhen this occurs, the first transistor 244 is turned on, pulling the gate G of the second transistor 246 low2And turns off the second transistor 246. Thus, the drain D of the second transistor 2462Through the first stepThe two biasing elements 242 are pulled high. When the gate G of the first transistor 2441Upper voltage (e.g. sense signal V)SEN) Less than reference voltage VREFSo that the gate-source voltage V of the first transistor 244GSLess than its turn-on threshold VTHWhen this occurs, the first transistor 244 is turned off. Gate G of the second transistor 2462The voltage on is pulled up through the first biasing component 240, thereby turning on the second transistor 246. Thus, the drain D of the second transistor 2462Is pulled down to a low level. Drain D of the second transistor 2462The voltage of the first and second switches is inverted twice by the inverter 248 and the inverter 250 and then converted into a result signal SHYS. Resulting signal SHYSPhase and drain D of2The voltage phases are the same and the resulting signal S HYSVoltage ratio drain D2The voltage is more stable. Therefore, when the battery cell VBATGreater than a predetermined reference VPRETime (e.g. sense signal V)SENGreater than a reference voltage VREFTime), the result signal SHYSHigh (e.g., the first level); when the battery cell VBATLess than a predetermined reference VPRETime (e.g. sense signal V)SENLess than reference voltage VREFTime), the result signal SHYSIs low (e.g., the second level). The "high level" and the "low level" mentioned here refer to logic levels that the control circuit 202 can recognize. The control circuit 202 controls the switch 112 according to the logic level.
Although the first transistor and the second transistor include an N-type metal oxide semiconductor field effect transistor in the example of fig. 2, the present invention is not limited thereto. In other embodiments, the first transistor and the second transistor may include a P-type metal oxide semiconductor field effect transistor, a PNP type transistor, or an NPN type transistor, or the like. The connection of the first and second bias components to the first and second transistors is not limited to the connection shown in fig. 2.
Furthermore, in one embodiment, voltage sensor 106 includes a resistor divider (e.g., a voltage divider formed from more than two resistors). Wherein the resistor divider Including a controllable resistance. Resulting signal SHYSMay be fed back to the voltage sensor 106 as a hysteresis control signal 252 to adjust the resistance of the controllable resistor, and thus the sense signal VSENAnd the voltage V of the batteryBATSuch that the resulting signal S output by the detection circuit 258 isHYSHas a hysteresis effect and is relatively stable. For example, when the battery voltage VBATReduced to less than a predetermined reference VPREThe hysteresis control signal 252 may slightly decrease the sense signal VSENAnd the voltage V of the batteryBATThe ratio of (A) to (B); and/or when the battery voltage VBATReturns to be larger than the preset reference VPREThe hysteresis control signal 252 may slightly increase the sense signal VSENAnd the voltage V of the batteryBATTo each other. This may reduce or avoid the resulting signal SHYSAt battery voltage VBATApproaching the preset reference VPREOscillations occur. Similarly, in one embodiment, the biasing assembly 240 and/or the biasing assembly 242 are controllable assemblies. Resulting signal SHYSMay be fed back to the comparison circuit 204 as a hysteresis control signal 254 to control the bias component 240 and/or the bias component 242 such that the resulting signal SHYSHas a hysteresis effect. In one embodiment, the mobile device 200 may use one or both of the hysteresis control signals 252 and 254.
FIG. 3 is a block diagram of a removable device 300 according to one embodiment of the present invention. Fig. 2 is described below in conjunction with fig. 1A, 1B, and 1C. In the embodiment of fig. 3, the control circuit 302 and the power supply circuit 328 are similar in structure and function to the control circuit 102 and the power supply circuit 128 described above, and therefore will not be described repeatedly.
In the embodiment of FIG. 3, the detection circuit 358 includes a reference voltage source 308 (e.g., a bandgap reference voltage source) powered by the battery 110 for generating the resulting signal SHYS. More specifically, reference voltage source 308 may be configured such that a minimum value V of the normal operating voltage of reference voltage source 308308MINIs equal to or slightly greater than the minimum value V of the normal operating voltage of the system load 114114MIN. Reference herein to "slightly greater than" means that the minimum value V is308MINMay be greater than the minimum value V114MINAnd the difference V between the two308MIN-V114MINRelatively small. In the present embodiment, the voltage V of the batteryBATPreset reference V for comparisonPREMinimum normal operating voltage V comprising reference voltage source 308308MIN. Therefore, when the battery voltage VBATGreater than a predetermined reference VPREAt this time, the reference voltage source 308 is activated to generate the reference voltage VREF(ii) a When the battery voltage VBATLess than a predetermined reference VPREThe reference voltage source 308 fails because it does not receive a sufficiently high supply voltage. In other words, when the battery voltage V BATGreater than a predetermined reference VPRE Reference voltage source 308 is enabled to generate a reference voltage having a first level (e.g., reference voltage V)REF) Result signal S ofHYS(ii) a When the battery voltage VBATLess than a predetermined reference VPREThe reference voltage source 308 is disabled to cause the result signal SHYSAt a second level (e.g., zero volts).
Fig. 4 is a flowchart illustrating a control method for controlling power supply to a load according to an embodiment of the present invention. Fig. 4 is described below in conjunction with fig. 1A, 1B, 1C, 2, and 3. Those skilled in the art will appreciate that the specific steps covered by fig. 4 are merely exemplary. That is, the present invention is applicable to other reasonable flows or steps that improve upon fig. 4.
At step 402, the battery 110 powers the system load 114.
At step 404, a detection circuit (e.g., 158, 258, or 358) detects the voltage V of the battery 110BATTo generate a result signal SHYS。
In step 406, the control circuit (e.g., 102, 202, or 302) responds to the resulting signal SHYSControls a switch 112 connected between the battery 110 and a system load 114.
In step 408, if the battery voltage VBATGreater than a predetermined reference VPREThen the detection circuit sets a result signal SHYSIs at a first level to controlThe control circuit turns on the switch 112.
At step 410, if the battery voltage VBATLess than a predetermined reference VPREThen the detection circuit sets a result signal SHYSAt a second level to control the control circuit to start timing.
In step 412, if the result signal S ends at the end of the preset time interval from the time of starting the timingHYSAt the second level, the control circuit turns off the switch 112.
The terms and expressions which have been employed herein are used as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding any equivalents of the features shown and described (or portions thereof), and there are alterations and modifications which fall within the scope of the claims. Other modifications, variations, and alternatives are also possible. Accordingly, the claims are intended to cover all such equivalents.
Claims (18)
1. A removable device, the removable device comprising:
a load powered by a battery;
a switch connected between the battery and the load;
a detection circuit for detecting a battery voltage of the battery and generating a result signal, wherein the detection circuit sets the result signal to a first level if the battery voltage is greater than a preset reference, and sets the result signal to a second level if the battery voltage is less than the preset reference; and
And the control circuit is connected with the switch and the detection circuit and is used for controlling the switch according to the result signal, wherein when the result signal is at the first level, the control circuit switches on the switch, when the result signal is changed from the first level to the second level, the control circuit starts timing, and if the result signal is at the second level when a preset time interval from the timing of starting timing is over, the control circuit switches off the switch.
2. The removable device of claim 1, wherein the detection circuit comprises:
a reference voltage source for providing a reference voltage;
a voltage sensing circuit for generating a sensing signal indicative of the battery voltage; and
a comparator connected to the reference voltage source and the voltage sensing circuit for comparing the sense signal to the reference voltage and generating the result signal.
3. The removable device of claim 2, wherein the comparator comprises a hysteresis comparator and the control circuit receives the result signal from the hysteresis comparator, the control circuit terminating the timing if the control circuit detects a transition of the result signal from the second level to the first level before the preset time interval ends.
4. The removable device of claim 1, wherein the removable device further comprises a power supply circuit and a reference terminal, and the detection circuit comprises:
a voltage sensing circuit for generating a sensing signal indicative of the battery voltage;
a first transistor, including a first terminal, a second terminal and a control terminal, wherein the control terminal is connected to the voltage sensing circuit to receive the sensing signal, the first terminal is connected to the power supply circuit through a first bias component, and the second terminal is connected to the reference terminal; and
a second transistor including a first terminal, a second terminal, and a control terminal, wherein the control terminal of the second transistor is connected to the first transistor, the first terminal of the second transistor is connected to the power supply circuit via a second bias component, and the second terminal of the second transistor is connected to the reference terminal,
wherein a conductive state of the second transistor controls the resulting signal.
5. The removable device of any of claims 1 to 4, wherein a minimum value of a normal operating voltage of the detection circuit and a minimum value of a normal operating voltage of the control circuit are less than a minimum value of a normal operating voltage of the load.
6. The removable device of claim 1, wherein the detection circuit comprises a reference voltage source powered by the battery for generating the resultant signal.
7. The removable device of claim 6, wherein the reference voltage source is enabled to generate the resultant signal having the first level when the battery voltage is greater than the preset reference, and the reference voltage source is disabled to place the resultant signal at the second level when the battery voltage is less than the preset reference.
8. The removable device of claim 6 or 7, wherein a minimum value of a normal operating voltage of the reference voltage source is greater than or equal to a minimum value of a normal operating voltage of the load.
9. The mobile device of any of claims 1-4, 6, and 7, wherein the preset reference is greater than a minimum value of a normal operating voltage of the load.
10. A control method of powering a load, the control method comprising:
powering the load with a battery;
detecting a battery voltage of the battery with a detection circuit to generate a result signal;
controlling, with a control circuit, a switch connected between the battery and the load according to the result signal;
If the battery voltage is greater than a preset reference, setting the result signal to be a first level to control the control circuit to conduct the switch;
if the battery voltage is smaller than the preset reference, setting the result signal as a second level to control the control circuit to start timing; and
and if the result signal is the second level at the end of a preset time interval from the time of starting the timing, the control circuit turns off the switch.
11. The control method according to claim 10, wherein the control method further comprises:
providing a reference voltage by using a reference voltage source;
generating a sense signal indicative of the battery voltage using a voltage sensing circuit; and
comparing the sense signal with the reference voltage with a comparator to generate the result signal.
12. The control method according to claim 11, wherein the comparator includes a hysteresis comparator, and the control method further comprises:
control the control circuit to receive the result signal from the hysteresis comparator;
the control circuit terminates the timing if the control circuit detects that the resultant signal transitions from the second level to the first level before the preset time interval ends.
13. The control method of claim 10, wherein the method further comprises:
generating a sense signal indicative of the battery voltage using a voltage sensing circuit;
receiving the sensing signal by using a control end of a first transistor, wherein the first transistor comprises a first end, a second end and the control end, the control end is connected with the voltage sensing circuit, the first end is connected with a power supply circuit through a first biasing component, and the second end is connected with a reference end; and
and controlling the conduction state of a second transistor to control the result signal, wherein the second transistor comprises a first end, a second end and a control end, the control end of the second transistor is connected with the first transistor, the first end of the second transistor is connected with the power supply circuit through a second bias component, and the second end of the second transistor is connected with the reference end.
14. The control method according to any one of claims 10 to 13, wherein a minimum value of a normal operating voltage of the detection circuit and a minimum value of a normal operating voltage of the control circuit are smaller than a minimum value of a normal operating voltage of the load.
15. The control method according to claim 10, wherein the control method further comprises:
generating the result signal using a reference voltage source powered by the battery.
16. The control method according to claim 15, wherein the control method further comprises:
when the battery voltage is greater than the preset reference, starting the reference voltage source to generate the result signal with the first level; and
and when the battery voltage is smaller than the preset reference, disabling the reference voltage source to set the result signal to be the second level.
17. A control method according to claim 15 or 16, wherein the minimum value of the normal operating voltage of the reference voltage source is greater than or equal to the minimum value of the normal operating voltage of the load.
18. A control method according to any one of claims 10 to 13, 15 and 16, wherein the preset reference is greater than a minimum value of a normal operating voltage of the load.
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| CN201910439538.5A CN111987754A (en) | 2019-05-24 | 2019-05-24 | Mobile device and control method for supplying power to load |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117895929A (en) * | 2023-12-29 | 2024-04-16 | 无锡市稳先微电子有限公司 | Intelligent electronic switch, integrated circuit chip, chip product and electronic equipment |
| CN117895929B (en) * | 2023-12-29 | 2024-10-22 | 无锡市稳先微电子有限公司 | Intelligent electronic switch, integrated circuit chip, chip product and electronic equipment |
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