CN113568360B - Power supply control circuit and handheld device - Google Patents
Power supply control circuit and handheld device Download PDFInfo
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- CN113568360B CN113568360B CN202111116814.8A CN202111116814A CN113568360B CN 113568360 B CN113568360 B CN 113568360B CN 202111116814 A CN202111116814 A CN 202111116814A CN 113568360 B CN113568360 B CN 113568360B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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Abstract
A power supply control circuit and a handheld device are provided, when a power supply needs to be started to supply power to a power consumption device, a key can generate a first signal when being triggered, a first switch module responds to the first signal generated when the key is triggered to be communicated, so that the power supply supplies power to a controller, the controller controls the first switch module and a second switch module to be communicated after normal power supply, so as to communicate a power supply passage from the power supply to the power consumption device, and at the moment, key triggering is cancelled, and the power supply of the power supply to the power consumption device is not influenced; when the power supply of the power supply to the electric device needs to be turned off, the key can generate a first signal and a second signal when being triggered, the controller responds to the second signal generated when the case is triggered to control the first switch module and the second switch module to be turned off so as to cut off the power supply path from the power supply to the electric device, at the moment, the key is cancelled to trigger, and the power supply path of the controller is cut off; in conclusion, under the condition that the power supply is turned off, the power supply of the controller is not required to be kept, and the power consumption of the power supply control circuit is reduced.
Description
Technical Field
The invention relates to the technical field of power supply control, in particular to a power supply control circuit and handheld equipment.
Background
There are generally two ways to turn off power in a handheld device, namely hard and soft switching. As shown in fig. 1, the hard switch has no standby power consumption and is strong in anti-interference capability, but before the key is triggered to turn off the power supply, data and state information in the handheld device cannot be stored in advance, and particularly for the handheld device, the handheld device cannot be turned off by using the hard switch due to limited size. The soft switch is used for supplying power to the small-scale controller by a power supply, then the controller detects the state of the soft key and controls the semiconductor switch device to realize connection and disconnection of the power supply, as shown in fig. 2, the soft switch can realize delayed disconnection of the power supply through programming, so that the electric device can detect state information and store the state information and data before the power supply is turned off, but the power supply needs to be continuously supplied to the controller, the standby power consumption is high, the controller is easy to be interfered, and the stability is poor.
Disclosure of Invention
The invention provides a power supply control circuit and handheld equipment, which reduce the standby power consumption of the power supply control circuit and improve the anti-interference performance.
According to a first aspect, there is provided in an embodiment a power supply control circuit for controlling power supply of a power supply to a power consuming device, comprising:
the first switch module is connected with the power supply and is used for controlling the connection and disconnection of the power supply output current path;
the second switch module is connected between the first switch module and the electric device and is used for controlling the connection and disconnection of a current path between the first switch module and the electric device;
the first switch module is connected in response to the first signal generated when the key is triggered;
the controller is used for responding to a second signal generated when the key is triggered and an interaction signal with a user device and controlling the connection and disconnection of the first switch module and the second switch module; the power supply end of the controller is connected to the first switch module, and the first switch module is further used for controlling connection and disconnection of a power supply path of the controller.
In one embodiment, the controller is configured to control the first switch module and the second switch module to be turned on and off in response to a second signal generated when the key is activated and an interaction signal with a user device, and includes:
under the condition that the controller is powered off, the first switch module responds to a first signal generated when the key is triggered, the power supply path of the controller is controlled to be communicated, and the controller controls the first switch module and the second switch module to be communicated so as to communicate the power supply to supply power to a power utilization device;
under the condition that the controller supplies power normally, the controller responds to a second signal generated when the key is triggered, sends a third signal to the user device, and controls the first switch module and the second switch module to be switched off when a fourth signal fed back by the user device in response to the third signal is received, so that the power supply is switched off to supply power to the electric device.
In one embodiment, the controller is configured to control the first switch module and the second switch module to be connected in response to a second signal generated when the key is activated, and includes:
after the power supply channel of the controller is communicated, the first switch module and the second switch module are controlled to be communicated after a first preset time.
In one embodiment, the controller, in response to the second signal generated when the key is activated, sending a third signal to the user device comprises:
and the controller responds to a second signal generated when the key is triggered and sends a third signal to the user device after a second preset time.
In one embodiment, the controller controls the first switch module and the second switch module to be turned off when receiving a fourth signal fed back by the user device in response to the third signal, and includes:
and when receiving a fourth signal fed back by the user device in response to the third signal, the controller controls the first switch module and the second switch module to be switched off after a third preset time.
In one embodiment, the controller is further configured to:
and within a preset fourth time after the third signal is sent to the user device, if a fourth signal fed back by the user device is not received, controlling the first switch module and the second switch module to be switched off.
In one embodiment, the first switch module comprises: the circuit comprises a clamping circuit, a first switching tube, a second switching tube, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a second capacitor;
wherein, the clamp circuit includes: the LED comprises a first diode, a second diode, a first pin connected to the cathode of the first diode, a second pin connected to the anode of the second diode and a third pin connected to the anode of the first diode, wherein the first diode and the second diode are connected in reverse parallel;
a first pin of the clamping circuit is connected with the positive electrode of the power supply and the first pole of the first switch tube, a second pin of the clamping circuit is connected with the negative electrode of the power supply, a third pin of the clamping circuit is connected with the control electrode of the first switch tube, and the second pole of the first switch tube is connected with the output end of the first switch module; one end of the second capacitor is connected with the first pole of the first switch tube, the other end of the second capacitor is connected with one end of the second resistor and the control pole of the first switch tube, the other end of the second resistor is connected with the first control end of the first switch module, the first resistor is connected in parallel with the two ends of the second capacitor, one end of the third resistor is connected with the control pole of the first switch tube, the other end of the third resistor is connected with the first pole of the second switch tube, the second pole of the second switch tube is connected with the ground, the control pole of the second switch tube is connected with the second control end of the first switch module through the fourth resistor, and the fifth resistor is connected in parallel between the control pole and the second pole of the second switch tube;
the first control end of the first switch module is used for receiving a first signal generated when the key is triggered; and the second control end of the first switch module is used for receiving a signal which is output by the controller and is used for controlling the first switch module to be connected and disconnected.
In an embodiment, the power supply device further comprises a controller power supply module, wherein the controller power supply module comprises a power management chip, a third capacitor, a fourth capacitor, a sixth resistor and a seventh resistor;
the power management chip includes: the power supply module comprises an EN pin, an IN pin, an OUT pin, an ADJ pin and a GND pin, wherein the EN pin and the IN pin are both connected with a second pole of a first switch tube, the EN pin and the IN pin are also connected with the GND pin through a third capacitor, the GND pin is connected with the ground, the ADJ pin is connected with the OUT pin through a sixth resistor, the ADJ pin is also connected with the GND pin through a seventh resistor, the OUT pin is also connected with the GND pin through a fourth capacitor, and the OUT pin is connected with the output end of the controller power supply module; the output end of the controller power supply module is connected with the power supply end of the controller.
In one embodiment, the second switch module comprises: the third switching tube, the fourth switching tube, the fifth capacitor, the eighth resistor, the ninth resistor, the tenth resistor and the eleventh resistor;
the first pole of the third switching tube is connected with the output end of the first switching module, the control pole of the third switching tube is connected with the first pole of the fourth switching tube through a ninth resistor, the second pole of the third switching tube is connected with the output end of the second switching module, one end of a fifth capacitor is connected with the first pole of the third switching tube, the other end of the fifth capacitor is connected with the control pole of the third switching tube, and an eighth resistor is connected to the two ends of the fifth capacitor in parallel; the second pole of the fourth switch tube is connected with the ground, the control electrode of the fourth switch tube is connected with the control end of the second switch module through a tenth resistor, one end of an eleventh resistor is connected with the control electrode of the fourth switch tube, and the other end of the eleventh resistor is connected with the second pole of the fourth switch tube;
the control end of the second switch module is used for receiving a signal which is output by the controller and used for controlling the second switch module to be connected and disconnected.
According to a second aspect, there is provided in one embodiment a handheld device comprising a power supply, a power control circuit as described in the previous embodiments, a power module and a processor;
the power supply control circuit is connected between the power supply and the power supply module and is used for controlling the connection and disconnection of a power supply path between the power supply and the power supply module;
the power supply module is used for processing the voltage output by the power supply and outputting the processed voltage to the processor so as to supply power to the processor and enable the processor to work normally;
when the processor works normally, after receiving a signal of a controller in the power control circuit, the processor stores data in the processor into a memory, and after the storage is finished, the processor feeds back the signal to the controller so that the controller controls the connection and disconnection of a first switch module and a second switch module in the power control circuit.
According to the power supply control circuit and the handheld device of the embodiment, when the power supply needs to be started to supply power to the electric device, the key can generate the first signal when being triggered, the first switch module is communicated in response to the first signal generated when the key is triggered, so that the power supply supplies power to the controller, the controller controls the first switch module and the second switch module to be communicated after normal power supply, so as to communicate the power supply to the power supply passage of the electric device, and the key triggering is cancelled at the moment, so that the power supply of the power supply to the electric device is not influenced; when the power supply of the power supply to the electric device needs to be turned off, the key can generate a first signal and a second signal when being triggered, the controller responds to the second signal generated when the case is triggered to control the first switch module and the second switch module to be turned off so as to cut off the power supply path from the power supply to the electric device, at the moment, the key is cancelled to trigger, and the power supply path of the controller is cut off; in conclusion, under the condition that the power supply is turned off, the power supply of the controller is not required to be kept, and the power consumption of the power supply control circuit is reduced; and adopt button and controller matched with mode, promoted power control circuit's interference immunity.
Drawings
FIG. 1 is a schematic structural diagram of a conventional handheld device;
FIG. 2 is a schematic diagram of another prior art handheld device;
FIG. 3 is a schematic structural diagram of a handheld device according to an embodiment;
FIG. 4 is a schematic diagram of a specific structure of the handheld device shown in FIG. 3;
FIG. 5 is a schematic electrical diagram of a portion of the hand-held device of FIG. 4;
fig. 6 is another circuit schematic diagram of a portion of the handheld device shown in fig. 4.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 3, fig. 3 is a schematic structural diagram of a handheld device according to an embodiment, where the handheld device according to the embodiment includes: a power supply 101, a power supply control circuit 102, and a powered device 103.
The power supply 101 provides power to the entire handheld device, and in general, the power supply 101 may be a battery or an adapter or the like.
Referring to fig. 4, the powered device 103 includes a power supply module 1031, a processor 1032, and a memory 1033. The power supply module 1031 is configured to process a voltage output by the power supply, and output the processed voltage to the processor 1032 to supply power to the processor 1032, so that the processor 1032 operates normally. For a handheld device, the power supply module 1031 may be an embedded power supply circuit. The processor 1032 is configured to control the handheld device to perform normal operation, and meanwhile, after receiving a signal for notifying the power off, which is output by the power control circuit 102, during normal operation, the processor 1032 stores data in the memory 1033, and after the storage is finished, feeds back a signal to the power control circuit, so that the power control circuit 102 turns off a power supply path from the power to the electric device 103.
The power control circuit 102 can control turning off a power supply path from the power source 101 to the electric device 103 and also control turning on a power supply path from the power source 101 to the electric device 103.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a power control circuit according to an embodiment, and the power control circuit 102 includes a first switch module 201, a second switch module 202, a key 203, a controller 204, a controller power supply module 205, and a status indication module 206.
The input end of the first switch module 201 is connected to the positive electrode of the power supply 101, and the first switch module 201 is used for controlling the connection and disconnection of the output current path of the power supply 101. The first switch module 201 in this embodiment includes a first control end and a second control end, and both the first control end and the second control end can receive an external signal to control the connection and disconnection of the first switch module 201.
The second switch module 202 is connected between the output end of the first switch module 201 and the electric device 103, and the second switch module 202 is used for controlling the connection and disconnection of the current path between the output end of the first switch module 201 and the electric device 103.
The key 203 can generate a first signal and a second signal when being triggered, and the first switch module 201 is connected in response to the first signal generated when the key 203 is triggered. The key 203 in this embodiment may be configured such that it is activated when the user presses the key, and it is deactivated when the user releases the key. The key 203 may be any one of the existing mechanical keys, and will not be described herein.
In this embodiment, the button 203 is connected to a first control end of the first switch module 201, and the first control end is configured to receive a first signal generated when the button 203 is triggered, and control the first switch module 201 to be connected in response to the first signal.
The controller 204 controls the connection and disconnection of the first switch module 201 and the second switch module 202 in response to a second signal generated when the key 203 is triggered and an interaction signal with the user device 103; the power supply end of the controller 204 is connected to the output end of the first switch module 201, and the first switch module 201 is further configured to control the connection and disconnection of the power supply path of the controller 204.
In this embodiment, the output terminal of the first switch module 201 is connected to the input terminal of the second switch module 202 and the power supply terminal of the controller 204, and the second control terminal of the first switch module 201 is connected to the controller 204, and the second control terminal can be used to control the connection and disconnection of the first switch module 201.
In an embodiment, a controller power supply module 205 is further included, the output terminal of the first switch module 201 and the controller power supply module are connected between the output terminal of the first switch module 201 and the controller 204, and the controller power supply module 205 is configured to convert the voltage output by the first switch module 201 into a voltage required by the power supply terminal of the controller 204.
The input end of the status indication module 206 is connected to the output end of the second switch module 202, and the status indication module 206 is used for indicating the power supply to power the power consuming device.
When the power is turned off (the controller is powered off), the user presses a key (a trigger key), and when a first signal generated by the first switch module 201 in response to the key trigger is communicated, the power supply end of the controller 204 is communicated with the power supply, so that the power supply starts to supply power to the controller 204, and the controller 204 works normally. After the controller 204 supplies power, the controller 204 controls the first switch module 201 to be connected through the second control end, at this time, if the user releases the key (cancels the triggering), the first switch module 201 still keeps connected, and the controller 204 controls the second switch module 202 to be connected through the control end of the second switch module 202. After the first switch module 201 and the second switch module 202 are both connected, the power supply path of the power supply to the electric device is connected, and the power supply 101 is turned on to supply power to the electric device 103.
In an embodiment, after the power supply path of the controller 204 is connected, after a first preset time T1 elapses, the controller 204 outputs a first control signal to the second control end of the first switch module 201, at this time, even if the user releases the key, the key does not generate the first signal any more, because of the first control signal output by the controller 204, the first switch module 201 continues to be connected, and at the same time, the controller 204 outputs a second control signal to the control end of the second switch module to control the second switch module to be connected, thereby completing the power supply of the power supply to the electric device.
When the power supply is turned on (the controller supplies power normally), the user presses a key (a trigger key), the controller 204 sends a third signal to the processor 1032 of the electric device 103 in response to a second signal generated when the key is triggered, the third signal is a signal for notifying that the power supply is turned off, the processor 1032 of the electric device 103 stores data and current state information of the processor 1032 in the memory 1033 after receiving the third signal, and feeds back a fourth signal to the controller 204 after the storage is finished, the fourth signal is a signal for notifying that the storage is finished, and the controller 204 controls the first switch module 201 and the second switch module 202 to be turned off after receiving the fourth signal, so as to cut off the power supply of the power supply 101 to the electric device 103.
In one embodiment, the controller 204 sends a third signal to the user device 103 after a second preset time T2 elapses in response to the second signal generated when the key 203 is activated.
In an embodiment, the controller 204 controls the first switch module 201 and the second switch module 202 to turn off after a third preset time T3 when receiving a fourth signal fed back by the user device 103 in response to the third signal. The third preset time T3 may be information contained in the fourth signal fed back by the processor 1032 of the electric device 103.
In this embodiment, the controller 204 receives the fed-back fourth signal, and outputs a second control signal to the control end of the second switch module 202 after a third preset time T3 elapses, so as to turn off the second switch module 203, where the power supply of the electric device 103 is turned off; then, the controller 204 outputs a first control signal to the second control terminal of the first switch module 201, and the user releases the key, the first switch module 201 is turned off, the power supply of the controller 204 is cut off, and the operation of turning off the power supply is completed. In summary, the embodiment of the invention realizes that the controller and the electric device are both powered off when the power is turned off, reduces power consumption, and simultaneously realizes that the data and the state information in the electric device are stored while the power is turned off, thereby avoiding the loss of the data and the state information.
In another embodiment, in the process of turning off the power supply, after a second preset time T2, the controller 204 sends a third signal to the user device 103 in response to a second signal generated when the key 203 is triggered, but because the processor 1032 in the electrical device 103 crashes, and the controller 204 does not receive a fourth signal fed back by the processor 1032 all the time, after the controller 204 sends the third signal to the user device 103, after a fourth preset time T4, the controller 204 does not receive the fed back fourth signal, and then the controller 204 determines that the processor 1032 of the electrical device 103 has a fault, and at this time, the power supply needs to be turned off forcibly, that is, the controller 204 outputs a second control signal to the control terminal of the second switch module 202 to turn off the second switch module 203, and at this time, the power supply of the electrical device 103 is turned off; then, the controller 204 outputs a first control signal to the second control terminal of the first switch module 201, and the user releases the key, the first switch module 201 is turned off, the power supply of the controller 204 is cut off, and the operation of turning off the power supply is completed.
Referring to fig. 5, fig. 5 is a circuit schematic diagram of the power control circuit shown in fig. 4, wherein the first switch module 201 includes: the circuit comprises a clamping circuit U1, a first switch tube Q1, a second switch tube Q2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a second capacitor C2.
Wherein, clamp circuit U1 includes: a first diode D1, a second diode D2, a first pin connected to the cathode of the first diode D1, a second pin connected to the anode of the second diode D2, and a third pin connected to the anode of the first diode D1, the first diode D1 and the second diode D2 being connected in anti-parallel.
A first pin of the clamp circuit U1 is connected with the anode of the power supply BAT and the first pole of the first switch tube Q1, a second pin of the clamp circuit U1 is connected with the cathode of the power supply BAT, a third pin of the clamp circuit U1 is connected with the control pole of the first switch tube Q1, and the second pole of the first switch tube Q1 is connected with the output end of the first switch module; one end of the second capacitor C2 is connected to the first pole of the first switch Q1, the other end of the second capacitor C2 is connected to one end of the second resistor R2 and the control pole of the first switch Q1, the other end of the second resistor R2 is connected to the first control end of the first switch module, the first resistor R1 is connected in parallel to the two ends of the second capacitor C2, one end of the third resistor R3 is connected to the control pole of the first switch, the other end of the third resistor R3 is connected to the first pole of the second switch Q2, the second pole of the second switch Q2 is connected to ground, the control pole of the second switch Q2 is connected to the second control pole of the first switch module through the fourth resistor R4, and the fifth resistor R5 is connected in parallel between the control pole and the second pole of the second switch Q2.
The first control end of the first switch module 201 is used for receiving a first signal generated when the key is triggered; the second control terminal of the first switch module 201 is configured to receive a signal, i.e., a first control signal, output by the controller 204 and used for controlling the first switch module 201 to turn on and off.
In addition, a filter capacitor C1 is connected in parallel between the positive electrode and the negative electrode of the power supply BAT, and the filter capacitor C1 can stabilize the voltage output by the power supply BAT.
In summary, in the first switch module 201, the clamp circuit U1 plays a role of protecting the first switch tube Q1, thereby increasing reliability.
The controller power supply module 205 includes a power management chip U2, a third capacitor C3, a fourth capacitor C4, a sixth resistor R6, and a seventh resistor R7; wherein, power management chip U2 includes: the power supply module comprises an EN pin, an IN pin, an OUT pin, an ADJ pin and a GND pin, wherein the EN pin and the IN pin are both connected with a second pole of a first switch tube Q1, the EN pin and the IN pin are also connected with the GND pin through a third capacitor C3, the GND pin is connected with the ground, the ADJ pin is connected with the OUT pin through a sixth resistor R6, the ADJ pin is also connected with the GND pin through a seventh resistor R7, the OUT pin is also connected with the GND pin through a fourth capacitor C4, and the OUT pin is connected with the output end of the controller power supply module; wherein, the output end of the controller power supply module 205 is connected with the power supply end of the controller 204.
The power management chip U2 is an LDO (low dropout regulator) that provides the controller 204 with the appropriate operating power.
Referring to fig. 6, fig. 6 is a circuit schematic diagram of the power control circuit shown in fig. 4, and the second switch module 202 includes: a third switching tube Q3, a fourth switching tube Q4, a fifth capacitor C5, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a thirteenth resistor R13 and a light emitting diode LED 1.
A first pole of a third switching tube Q3 is connected with an output end of the first switching module, a control pole of the third switching tube Q3 is connected with a first pole of a fourth switching tube Q4 through a ninth resistor R9, a second pole of the third switching tube Q3 is connected with an output end of the second switching module, one end of a fifth capacitor C5 is connected with a first pole of a third switching tube Q3, the other end of the fifth capacitor C5 is connected with a control pole of the third switching tube Q3, an eighth resistor R8 is connected in parallel with two ends of the fifth capacitor C5, one end of a thirteenth resistor R13 is connected with a second pole of the third switching tube Q3, the other end of the thirteenth resistor R13 is connected with an anode of a light emitting diode LED1, and a cathode of the light emitting diode LED1 is connected with ground; the second pole of the fourth switch Q4 is connected to ground, the control electrode of the fourth switch Q4 is connected to the control terminal of the second switch module through a tenth resistor R10, one end of an eleventh resistor R11 is connected to the control electrode of the fourth switch Q4, and the other end of the eleventh resistor R11 is connected to the second pole of the fourth switch Q4.
The control end of the second switch module 202 is configured to receive a signal output by the controller 204 and used for controlling the second switch module to be turned on and off.
The status indication module 206 includes a thirteenth resistor R13 and a light emitting diode LED1, the output terminal of the second switch module 202 is connected to the anode of the light emitting diode LED1 through a thirteenth resistor R13, the cathode of the light emitting diode LED1 is connected to ground, the light emitting diode LED1 is turned on when the power supply supplies power to the electric consumer, and the light emitting diode LED1 is turned off when the power supply is turned off.
And (3) starting a power supply: when the key S1 is not pressed, and the first control signal CON2 is at a low level because the controller (MCU) is not powered on, the voltage of the control electrode and the first electrode of the first switch Q1 are equal, the first switch Q1 is not turned on, and the power BAT consumes almost no power, and the standby power consumption is very low. When the key S1 is pressed, the first signal (CON 1) is at a low level, the voltage of the control electrode of the first switch tube Q1 VQ11 is close to VQ11= VBAT R2/(R1+ R2), the voltage difference between the first pole and the control pole of the first switch tube Q1 is greater than the turn-on voltage VTH of the first switch tube Q1, the first switch tube Q1 is turned on, the first voltage connection terminal VCC is connected to the input terminal of the second switch module, and the second voltage connection terminal VCC _ MCU is connected to the power supply terminal of the controller. Moreover, the second capacitor C2 and the first resistor R1 simultaneously constitute a slow start circuit of the first switch tube Q1, when the key S1 is pressed, because of the existence of the second capacitor C2, VQ11 is slowly reduced, the voltage difference between the first pole and the control pole of the first switch tube Q1 is gradually increased, and the first switch tube Q1 is turned on after being turned off to the variable resistor. In summary, the slow start circuit of the first switch Q1, which is composed of the second capacitor C2 and the first resistor R1, prevents the first switch Q1 from being burned out due to the spike current generated by the instant conduction, thereby increasing the reliability of the circuit. After the controller 204 supplies power, a first preset time T1 passes, and the controller outputs a first control signal CON2 at a high level, so as to turn on the second switch Q2, where VQ11= VBAT (R2| | R3)/(R1+ R2| | | R3), a voltage difference between the first pole and the second pole of the Q1 is still greater than the start voltage VTH of the first switch Q1, and the first switch Q1 continues to be turned on, and at this time, even if the user releases the key S1, the first voltage receiving terminal VCC is still turned on.
The controller (MCU) continues to MONITOR the state of the second signal (MONITOR), and if the MONITOR signal (second signal) is still low for a certain time (second preset time T2), it indicates that the user wants to turn on the power supply instead of touching it by mistake. Since the controller (MCU) is not powered on in the standby state, the second signal (MONITOR) is at a low level, the first signal (CON 1) is close to VBAT, and the diode D2 can prevent interference between the first signal and the second signal, and the twelfth resistor R12 and the sixth capacitor C6 of the immunity circuit are added, thereby further improving the stability of the system. The controller (MCU) outputs the second control signal (CON 3) as high level, and the second switch module is turned on.
The second switch module 202 includes a third switch tube Q3 and a fourth switch tube Q4, and the circuit principle of the second switch module 202 is the same as that of the first switch module 201, and is not described herein again. The thirteenth resistor R13 and the light emitting diode LED1 form a state indicating module, when the second switch module is communicated, the light emitting diode LED1 emits light, and after a user sees a light emitting indication, the user releases the key to turn on the power supply.
And (3) turning off the power supply: the user presses the button S1 and the controller (MCU) MONITORs the second signal (MONITOR). When the low level time of the second signal (MONITOR) exceeds a second preset time T2, the controller (MCU) reports a third signal (INT) of the processor, and the processor performs operations such as data saving. When the saving is completed, the processor transmits a fourth signal (I2C _ SCL, I2C _ SDA) to the controller (MCU) through the IIC bus. If the controller (MCU) receives the fourth signal, outputs the second control signal (CON 3) as low level after the third preset time T3, the third switching tube Q3 is turned off, and the processor is powered off. The light emitting diode LED1 goes off, and at this time, the user can release the key S1, the controller (MCU) outputs the first control signal (CON 2) as low level, the first switch Q1 is turned off, and the controller is turned off.
In addition, when the controller (MCU) reports the third signal (INT) of the processor, the processor may have a "dead halt state", the processor does not send back the fourth signal to the controller (MCU) all the time, and after a fourth preset time T4, the controller (MCU) executes a forced power-off operation to prevent failure of power-off.
In this embodiment, the first switching transistor Q1 and the third switching transistor Q2 are N-type MOSFET transistors, and the second switching transistor Q2 and the fourth switching transistor Q4 are NPN transistors. The controller (MCU) is a singlechip, and the model can be MSP430FR2311 IRGYR.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A power control circuit for controlling the power supplied by a power source to a powered device, comprising:
the first switch module is connected with the power supply and is used for controlling the connection and disconnection of the power supply output current path;
the second switch module is connected between the first switch module and the electric device and is used for controlling the connection and disconnection of a current path between the first switch module and the electric device;
the first switch module is connected in response to the first signal generated when the key is triggered;
the controller is used for responding to a second signal generated when the key is triggered and an interaction signal with a user device and controlling the connection and disconnection of the first switch module and the second switch module; the power supply end of the controller is connected to the first switch module, and the first switch module is further used for controlling connection and disconnection of a power supply path of the controller.
2. The power control circuit of claim 1, wherein the controller is configured to control the first switch module and the second switch module to be turned on and off in response to a second signal generated when a key is activated and an interaction signal with a user device, and comprises:
under the condition that the controller is powered off, the first switch module responds to a first signal generated when the key is triggered, the power supply path of the controller is controlled to be communicated, and the controller controls the first switch module and the second switch module to be communicated so as to communicate the power supply to supply power to a power utilization device;
under the condition that the controller supplies power normally, the controller responds to a second signal generated when the key is triggered, sends a third signal to the user device, and controls the first switch module and the second switch module to be switched off when a fourth signal fed back by the user device in response to the third signal is received, so that the power supply is switched off to supply power to the electric device.
3. The power control circuit of claim 2, wherein the controller is configured to control the first switch module and the second switch module to be connected in response to a second signal generated when the key is activated, and comprises:
after the power supply channel of the controller is communicated, the first switch module and the second switch module are controlled to be communicated after a first preset time.
4. The power control circuit of claim 2, wherein the controller, in response to the second signal generated upon key activation, sends a third signal to the user device comprising:
and the controller responds to a second signal generated when the key is triggered and sends a third signal to the user device after a second preset time.
5. The power control circuit of claim 2, wherein the controller controls the first and second switching modules to turn off upon receiving a fourth signal fed back by the user device in response to the third signal, comprising:
and when receiving a fourth signal fed back by the user device in response to the third signal, the controller controls the first switch module and the second switch module to be switched off after a third preset time.
6. The power control circuit of claim 2, wherein the controller is further to:
and within a preset fourth time after the third signal is sent to the user device, if a fourth signal fed back by the user device is not received, controlling the first switch module and the second switch module to be switched off.
7. The power control circuit of claim 1, wherein the first switch module comprises: the circuit comprises a clamping circuit (U1), a first switching tube (Q1), a second switching tube (Q2), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5) and a second capacitor (C2);
wherein the clamp circuit (U1) comprises: a first diode (D1), a second diode (D2), a first pin connected to a cathode of the first diode (D1), a second pin connected to an anode of the second diode (D2), and a third pin connected to an anode of the first diode (D1), the first diode (D1) and the second diode (D2) being connected in anti-parallel;
a first pin of the clamping circuit (U1) is connected with the anode of a power supply (BAT) and a first pole of a first switch tube (Q1), a second pin of the clamping circuit (U1) is connected with the cathode of the power supply (BAT), a third pin of the clamping circuit (U1) is connected with the control pole of the first switch tube (Q1), and a second pole of the first switch tube (Q1) is connected with the output end of the first switch module; one end of the second capacitor (C2) is connected to a first pole of the first switch tube (Q1), the other end of the second capacitor (C2) is connected to one end of the second resistor (R2) and a control pole of the first switch tube (Q1), the other end of the second resistor (R2) is connected to a first control end of the first switch module, the first resistor (R1) is connected in parallel to two ends of the second capacitor (C2), one end of the third resistor (R3) is connected to the control pole of the first switch tube, the other end of the third resistor (R3) is connected to a first pole of the second switch tube (Q2), a second pole of the second switch tube (Q2) is connected to ground, the control pole of the second switch tube (Q2) is connected to a second control pole of the first switch module through the fourth resistor (R4), and the fifth resistor (R5) is connected in parallel between the control pole of the second switch tube (Q2) and the second diode;
the first control end of the first switch module is used for receiving a first signal generated when the key is triggered; and the second control end of the first switch module is used for receiving a signal which is output by the controller and is used for controlling the first switch module to be connected and disconnected.
8. The power control circuit of claim 7, further comprising a controller power module comprising a power management chip (U2), a third capacitor (C3), a fourth capacitor (C4), a sixth resistor (R6), and a seventh resistor (R7);
the power management chip (U2) includes: the controller comprises an EN pin, an IN pin, an OUT pin, an ADJ pin and a GND pin, wherein the EN pin and the IN pin are both connected with a second pole of a first switch tube (Q1), the EN pin and the IN pin are also connected with the GND pin through a third capacitor (C3), the GND pin is connected with the ground, the ADJ pin is connected with the OUT pin through a sixth resistor (R6), the ADJ pin is also connected with the GND pin through a seventh resistor (R7), the OUT pin is also connected with the GND pin through a fourth capacitor (C4), and the OUT pin is connected with the output end of the controller power supply module; the output end of the controller power supply module is connected with the power supply end of the controller.
9. The power control circuit of claim 1, wherein the second switching module comprises: a third switching tube (Q3), a fourth switching tube (Q4), a fifth capacitor (C5), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10) and an eleventh resistor (R11);
a first pole of the third switching tube (Q3) is connected with an output end of the first switching module, a control pole of the third switching tube (Q3) is connected with a first pole of the fourth switching tube (Q4) through a ninth resistor (R9), a second pole of the third switching tube (Q3) is connected with an output end of the second switching module, one end of a fifth capacitor (C5) is connected with a first pole of the third switching tube (Q3), the other end of the fifth capacitor (C5) is connected with a control pole of the third switching tube (Q3), and an eighth resistor (R8) is connected with two ends of the fifth capacitor (C5) in parallel; the second pole of the fourth switch (Q4) is connected to the ground, the control pole of the fourth switch (Q4) is connected with the control end of the second switch module through a tenth resistor (R10), one end of an eleventh resistor (R11) is connected with the control pole of the fourth switch (Q4), and the other end of the eleventh resistor (R11) is connected with the second pole of the fourth switch (Q4);
the control end of the second switch module is used for receiving a signal which is output by the controller and used for controlling the second switch module to be connected and disconnected.
10. A handheld device comprising a power supply, a power control circuit as claimed in any one of claims 1 to 9, a power supply module and a processor;
the power supply control circuit is connected between the power supply and the power supply module and is used for controlling the connection and disconnection of a power supply path between the power supply and the power supply module;
the power supply module is used for processing the voltage output by the power supply and outputting the processed voltage to the processor so as to supply power to the processor and enable the processor to work normally;
when the processor works normally, after receiving a signal of a controller in the power control circuit, the processor stores data in the processor into a memory, and after the storage is finished, the processor feeds back the signal to the controller so that the controller controls the connection and disconnection of a first switch module and a second switch module in the power control circuit.
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| CN114488910A (en) * | 2022-02-18 | 2022-05-13 | 坎德拉（深圳）科技创新有限公司 | Restart control device and robot |
| CN114583813A (en) * | 2022-03-15 | 2022-06-03 | 重庆海尔滚筒洗衣机有限公司 | Power supply circuit |
| CN117294132B (en) * | 2023-11-23 | 2024-03-01 | 深圳市鼎阳科技股份有限公司 | Power supply circuit and switching method thereof |
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