CN114531022B - Starting-up circuit and electronic equipment - Google Patents
Starting-up circuit and electronic equipment Download PDFInfo
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- CN114531022B CN114531022B CN202210235040.9A CN202210235040A CN114531022B CN 114531022 B CN114531022 B CN 114531022B CN 202210235040 A CN202210235040 A CN 202210235040A CN 114531022 B CN114531022 B CN 114531022B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
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Abstract
The invention discloses a starting circuit and electronic equipment, wherein the starting circuit comprises a power input end, a power output end, a first key circuit, a first pull-down circuit, a first switch circuit and a control circuit, the first pull-down circuit is provided with a first end, a second end, a first controlled end and a second controlled end, the first end of the first pull-down circuit is grounded, and the first controlled end of the first pull-down circuit is connected with the output end of the first key circuit. The first end of the first switch circuit is connected with the power input end, the second end of the first switch circuit is connected with the power output end, and the controlled end of the first switch circuit is connected with the second end of the first pull-down circuit. The detection end of the control circuit is connected with the power input end, and the first output end of the control circuit is connected with the second controlled end of the first pull-down circuit. The technical problem that a power supply path can not be kept on for a long time when an existing switch is started is solved.
Description
Technical Field
The invention relates to the technical field of switches, in particular to a starting circuit and electronic equipment.
Background
The starting-up working circuit in the prior art is generally realized by adopting a self-locking switch or a continuous conduction switch, and the starting-up working circuit is generally applied to occasions with larger volumes of electronic products, but cannot be realized by using the self-locking switch or the continuous conduction switch when the volumes of the electronic products are smaller.
The conventional small switch generally serves as a trigger signal, and cannot be kept on like a self-locking switch or a continuous conducting switch for a long time, so that the power supply of electronic equipment is unstable.
Disclosure of Invention
The present invention is directed to solve at least one of the problems of the prior art, and provides a power-on start circuit and an electronic device, which solve the problem that the power supply path cannot be kept on for a long time when the switch is started.
In order to achieve the above object, the present invention provides a boot-up circuit, including:
the power supply input end is used for accessing a power supply;
the power supply output end is used for outputting the power supply;
the first key circuit is used for outputting a corresponding first electric signal according to an external key signal;
the first pull-down circuit is provided with a first end, a second end, a first controlled end and a second controlled end, the first end of the first pull-down circuit is grounded, and the first controlled end of the first pull-down circuit is connected with the output end of the first key circuit and is used for outputting a corresponding second electric signal according to the first electric signal;
a first switch circuit, a first end of which is connected to the power input end, a second end of which is connected to the power output end, and a controlled end of which is connected to the second end of the first pull-down circuit, and controls the first switch circuit to be turned on or off according to the second electrical signal, so as to control a path between the power input end and the power output end to be turned on or off;
and a power supply end of the control circuit is connected with the power supply output end, and a first output end of the control circuit is connected with a second controlled end of the first pull-down circuit and is used for outputting a third electric signal corresponding to the voltage of the power supply output end so as to ensure that the first pull-down circuit continuously outputs a second electric signal corresponding to the initial first electric signal and maintain the stable output of the power supply output end.
Optionally, the first pull-down circuit includes a first charging module and a first pull-down module, an input end of the first charging module is a first controlled end of the first pull-down circuit, and an output end of the first charging module is connected to a second controlled end of the first pull-down circuit; the first end of the first pull-down module is a first end of the first pull-down circuit, and the second end of the first pull-down module is a second end of the first pull-down circuit;
the first charging module is used for being charged when the current of the first electric signal is larger than zero and discharging when the charging amount exceeds the capacitance of the first charging module;
the first pull-down module is configured to pull down a voltage of the second end of the first pull-down circuit to a ground voltage when the first charging module discharges.
Optionally, the first charging module includes a first capacitor, a first diode, a second diode, a first resistor, a second resistor, a first power end, and a third resistor, where a first end of the first capacitor is an input end of the first charging module, and a second end of the first capacitor, a cathode of the first diode, and a first end of the first resistor are interconnected; the first end of the second resistor, the second end of the first resistor and the first end of the third resistor are interconnected, and the connection node of the second resistor, the second end of the first resistor and the first end of the third resistor is the output end of the first charging module; the second end of the third resistor and the anode of the first diode are both grounded; the cathode of the second diode is connected with the second end of the second resistor, and the anode of the second diode is connected to the first power supply end.
Optionally, the first pull-down module includes a second capacitor, a first switch tube, and a fourth resistor, a first end of the first switch tube is a first end of the first pull-down module, a second end of the first switch tube, a first end of the second capacitor, and a first end of the fourth resistor are connected, and a controlled end of the first switch tube is a controlled end of the first pull-down module; the second end of the second capacitor is grounded; a second end of the fourth resistor is a second end of the first pull-down module.
Optionally, the power-on starting circuit further includes a second key circuit and a second pull-down circuit, the control circuit further includes a sampling terminal, a first terminal of the second key circuit is grounded, a second terminal of the second key circuit is connected to an input terminal of the second pull-down circuit, and a detection terminal of the second key circuit is connected to the sampling terminal of the control circuit; the output end of the second pull-down circuit is connected with the controlled end of the first switch circuit;
the second key circuit is used for switching on or off according to an external key signal;
the second pull-down circuit is used for working when the second key circuit is conducted so as to pull down the voltage of the output end of the second pull-down circuit;
the control circuit is further used for detecting the voltage of the detection end of the second key circuit.
Optionally, the second key circuit includes a second switch, a third diode, a fifth resistor, and a sixth resistor, a first end of the second switch is a first end of the second key circuit, a second end of the second switch is connected to a cathode of the third diode, and a connection node thereof is a second end of the second key circuit; the second end of the fifth resistor is connected with the first end of the sixth resistor, the connection node of the fifth resistor is the detection end of the second key circuit, and the second end of the sixth resistor is connected to a power supply.
Optionally, the second pull-down circuit includes a fourth diode and a seventh resistor, a cathode of the fourth diode is an input end of the second pull-down circuit, an anode of the fourth diode is connected to a first end of the seventh resistor, and a second end of the seventh resistor is an output end of the second pull-down circuit.
Optionally, the power-on start-up circuit further includes a power protection circuit and a second power end, the power end of the power protection circuit is connected to the second power end, the first end of the power protection circuit is connected to the second end of the first switch circuit, and the second end of the power protection circuit is connected to the power output end.
Optionally, the power protection circuit includes an eighth resistor, a ninth resistor, and a second switch tube, a first end of the eighth resistor is grounded, and a second end of the eighth resistor, a controlled end of the second switch tube, and a first end of the ninth resistor are interconnected; the second end of the ninth resistor is a power supply end of the power supply protection circuit, the first end of the second switching tube is a first end of the power supply protection circuit, and the second end of the second switching tube is a second end of the power supply protection circuit.
In order to achieve the above object, the present invention further provides a working circuit, where the working circuit includes an energy storage component, a working component, and the start-up circuit as described above, and the start-up circuit is disposed between the energy storage component and the working component.
In the above invention patent, a power input terminal is connected to a device power supply, a power output terminal outputs the power supply, a first key circuit outputs a corresponding first electrical signal according to an external key signal, a first pull-down circuit outputs a corresponding second electrical signal according to the first electrical signal, and a first switch circuit is turned on or off according to the second electrical signal to control a path between the power input terminal and the power output terminal to be turned on or off. The control circuit detects the voltage of the power supply input end and outputs a corresponding third electric signal according to the voltage so as to ensure that the first pull-down circuit continuously outputs a second electric signal corresponding to the initial first electric signal and maintain the stable output of the power supply output end. The technical problem that a power supply path can not be kept on for a long time when an existing switch is started is solved.
Drawings
The invention is further described below with reference to the accompanying drawings and examples;
FIG. 1 is a block diagram of a power-on circuit according to an embodiment.
FIG. 2 is a circuit diagram of a power-on circuit according to an embodiment.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
The invention provides a starting circuit and electronic equipment, aiming at solving the technical problem that the conduction of a power supply path of a power supply cannot be kept for a long time when the existing switch is started.
In one embodiment, as shown in fig. 1, the power-on start circuit includes a power input terminal LI-BAT, a power output terminal BAT, a first key circuit 30, a first pull-down circuit 20, a first switch circuit 10, and a control circuit 40, where the first pull-down circuit 20 has a first terminal, a second terminal, a first controlled terminal, and a second controlled terminal, the first terminal of the first pull-down circuit 20 is grounded, and the first controlled terminal of the first pull-down circuit 20 is connected to the output terminal of the first key circuit 30. The first end of the first switch circuit 10 is connected to the power input end LI-BAT, the second end of the first switch circuit 10 is connected to the power output end BAT, and the controlled end of the first switch circuit 10 is connected to the second end of the first pull-down circuit 20. The detection end of the control circuit 40 is connected to the power output terminal BAT, and the first output end of the control circuit 40 is connected to the second controlled end of the first pull-down circuit 20.
The power input end LI-BAT is connected to a device power supply, the power output end BAT outputs the power supply, the first key circuit 30 outputs a corresponding first electric signal according to an external key signal, the first pull-down circuit 20 outputs a corresponding second electric signal according to the first electric signal, and the first switch circuit 10 controls the first switch circuit to be switched on or switched off according to the second electric signal so as to control the switching on or switching off of a circuit between the power input end LI-BAT and the power output end BAT. The control circuit 40 detects the voltage of the power input terminal LI-BAT, and outputs a corresponding third electrical signal according to the voltage to ensure that the first pull-down circuit 20 continuously outputs a second electrical signal corresponding to the initial first electrical signal, so as to maintain the stable output of the power output terminal BAT. The technical problem that a power supply path of a power supply can not be kept on for a long time when an existing switch is started is solved. Wherein the first electrical signal is actually a high-low level signal:
the operation principle of the above embodiment is explained based on the above high-low level signals:
a starting process: the first key circuit 30 is in a normally open state, i.e., outputs a high level, and the power input terminal LI-BAT is connected to the device power source, so that the first key circuit 30 outputs a first electrical signal of a high level, and then the first pull-down circuit 20 outputs a second electrical signal of a low level according to the first electrical signal to turn on the first switch circuit 10. In this process, since the power input end LI-BAT is connected to the power supply of the device, the control circuit 40 continuously outputs the high-level third electrical signal, i.e., the initial first electrical signal, so as to ensure that the second electrical signal is always in the low-level state and keep the device working.
Shutdown process: the first key circuit 30 is pressed, i.e., outputs a low level, forcibly pulls down the power input terminal LI-BAT voltage to a low level, the first key circuit 30 outputs a first electrical signal of a low level, and then the first pull-down circuit 20 outputs a second electrical signal of a high level according to the first electrical signal of a low level to turn off the first switch circuit 10. In this process, since the device power supply of the BAT at the power supply output terminal is turned off, the power supply of the control circuit 40 is turned off, and thus the high-level third electrical signal cannot be continuously output, and only the low-level third electrical signal can be output, so that the first electrical signal is at a low level, so that the first pull-down circuit 20 outputs the high-level second electrical signal, and the off state of the first switch circuit 10 is maintained.
In the above process, the release or press of the key in the first key circuit 30 outputs the high level or the low level, the second electrical signal is the high-low level signal outputted corresponding to the previous high-low level, and the change of the second electrical signal is consistent with the first electrical signal, that is, the low-level first electrical signal corresponds to the high-level second electrical signal and the low-level third electrical signal, and the high-level first electrical signal corresponds to the low-level second electrical signal and the high-level third electrical signal.
In one embodiment, as shown in fig. 1, the first pull-down circuit 20 includes a first charging module and a first pull-down module, an input terminal of the first charging module is a first controlled terminal of the first pull-down circuit 20, and an output terminal of the first charging module is connected to a second controlled terminal of the first pull-down circuit; the first end of the first pull-down module is a first end of the first pull-down circuit 20, and the second end of the first pull-down module is a second end of the first pull-down circuit 20.
The first charging module is charged when the current of the first electric signal is greater than zero, and discharges when the charging amount exceeds the capacitance of the first charging module, and the first pull-down module outputs the ground voltage when the first charging module discharges, namely, the voltage of the second end of the first pull-down circuit is pulled down to the ground voltage. At this time, the first charging module performs the outputting and the pull-down operation after being fully charged, so as to avoid the false triggering of the first electrical signal of the first key circuit 30, and in addition, the stability of the second electrical signal output by the first pull-down circuit 20 can be strictly ensured by the first pull-down module.
Optionally, the power input terminal LI-BAT is connected to a first terminal 1 of the power supply VBUS, and a second terminal 2 of the power supply VBUS is connected to ground. By arranging the power supply in the invention, the portability of the electronic equipment applied by the application can be improved.
In an embodiment, as shown in fig. 2, the first charging module includes a first capacitor C1, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a first power source terminal, and a third resistor R3, a first terminal of the first capacitor C1 is an input terminal of the first charging module, and a second terminal of the first capacitor C1, a cathode of the first diode D1, and a first terminal of the first resistor R1 are interconnected; a first end of the second resistor R2, a second end of the first resistor R1, and a first end of the third resistor R3 are interconnected, and a connection node thereof is an output end of the first charging module; a second end of the third resistor R3 and an anode of the first diode D1 are both grounded; the cathode of the second diode D2 is connected to the second end of the second resistor R2, and the anode of the second diode D2 is connected to the first power terminal.
In the circuit, the current is charged through the first capacitor C1, and then the subsequent first pull-down circuit 20 is discharged through the charging module consisting of the first diode, the second diode, the first resistor R1, the second resistor R2 and the third resistor R3 after being fully charged, at this time, because the first charging module is connected to the first power end, the electric signal output after voltage division can be ensured to trigger the pull-down action of the first pull-down module, in addition, the first capacitor C1 can also be discharged, and the comprehensive effect of the two ensures that the electric signal output after voltage division is stable.
In an embodiment, as shown in fig. 2, the first pull-down module includes a second capacitor C2, a first switch Q1, and a fourth resistor R4, a first end of the first switch Q1 is a first end of the first pull-down module, a second end of the first switch Q1, a first end of the second capacitor C2, and a first end of the fourth resistor R4 are connected, and a controlled end of the first switch Q1 is a controlled end of the first pull-down module; the second end of the second capacitor C2 is grounded; a second end of the fourth resistor R4 is a second end of the first pull-down module.
At this time, the first switch K1 is turned on when the first charging module outputs the electrical signal, and discharges through the ground terminal, and at this time, the second electrical signal with a low voltage is output through the fourth resistor R4.
Optionally, the first switching tube Q1 is a triode.
Optionally, the first switch circuit 10 includes a third switch tube Q3 and a tenth resistor R10, and the circuit connection relationship is as shown in fig. 2, a controlled terminal of the third switch tube Q3 is connected to a first terminal of the tenth resistor R10, a connection node of the controlled terminal is the controlled terminal of the first switch circuit 10, a first terminal 2 of the third switch tube Q3 is the first terminal of the first switch circuit 10, and a second terminal 3 of the third switch tube Q3 is the first terminal of the first switch circuit 10.
Optionally, the third switching tube Q3 is a P-channel MOS tube.
Optionally, the first key circuit 30 includes an eleventh resistor R11, a twelfth resistor R12, and a first switch K1, and the connection relationship is as shown in fig. 2, a first end 1 of the first switch is grounded, a second end 2 of the first switch, a first end of the twelfth resistor R12, and a first end of the eleventh resistor R11 are connected, a third end 3 of the first switch is connected to a second end of the twelfth resistor R12, a connection node thereof is an output end of the first key circuit 30, and a second end of the eleventh resistor R11 is connected to the power input end LI-BAT. Wherein, first switch K1 chooses hall switch to realize for use.
In an embodiment, as shown in fig. 2, the power-on start circuit further includes a second key circuit and a second pull-down circuit, the control circuit further includes a sampling terminal, a first terminal of the second key circuit is grounded, a second terminal of the second key circuit is connected to an input terminal of the second pull-down circuit, and a detection terminal of the second key circuit is connected to the sampling terminal of the control circuit 40; the output terminal of the second pull-down circuit is connected to the controlled terminal of the first switch circuit 10.
The second key circuit is switched on or off according to an external key signal, the second pull-down circuit works when the second key circuit is switched on so as to pull down the voltage of the output end of the second pull-down circuit, and the control circuit detects the voltage of the detection end of the second key circuit. It should be noted that, at this time, the output terminals of the second pull-down circuit and the first pull-down circuit 20 are both connected to the same controlled terminal, but because the power supply terminal of the first key circuit 30 is directly connected to the power input terminal LI-BAT, and the first key circuit 30 is not pressed, the voltage of the power input terminal LI-BAT at this time is forcibly pulled down to the low level, even if the first switch circuit 10 at this time is not turned on, the second key circuit has the same high-low level as the first key circuit 30 to control the first switch circuit 10 to be turned on, but needs to be limited by the first key circuit 30, through the above steps, the false start caused by the false start key operation of the second key circuit can be avoided, and the false start operation of the first key circuit 30 is realized through the circuit itself. Thereby comprehensively ensuring the safety of the whole circuit.
In an embodiment, the second key circuit includes a second switch K2, a third diode D3, a fifth resistor R5, and a sixth resistor R6, a first end of the second switch K2 is a first end of the second key circuit, a second end of the second switch K2 is connected to a cathode of the third diode D3, and a connection node thereof is a second end of the second key circuit; an anode 1 of the third diode D3 is connected to a first end of the fifth resistor R5, a second end of the fifth resistor R5 is connected to a first end of the sixth resistor R6, a connection node of the fifth resistor R5 is a detection end of the second key circuit, and a second end of the sixth resistor R6 is connected to a power supply.
When the second switch K2 is pressed, a circuit formed by the third diode D3, the fifth resistor R5, and the sixth resistor R6 is turned on, and the voltage of the cathode of the third diode D3 is forcibly pulled down to a low level and output. In addition, since the voltage of the second key circuit is detected at this time, when the power supply is insufficient, the voltage can be fed back to the control circuit 40 to forcibly output a low level to control the first switch circuit 10 to be turned off. Thereby ensuring that the undervoltage output of the battery is avoided.
Optionally, the second switch K2 is a key switch.
In an embodiment, the second pull-down circuit includes a fourth diode D4 and a seventh resistor R7, a cathode of the fourth diode D4 is an input terminal of the second pull-down circuit, an anode 2 of the fourth diode D4 is connected to a first terminal of the seventh resistor R7, and a second terminal of the seventh resistor R7 is an output terminal of the second pull-down circuit.
Through the circuit, effective pull-down is realized.
In an embodiment, the power-on start-up circuit further includes a power protection circuit, a power supply end of the power protection circuit is connected to a first power supply end, a first end of the power protection circuit is connected to the second end of the first switch circuit 10, and a second end of the power protection circuit is connected to the power output terminal BAT.
At this time, the second end of the power protection circuit and the power output terminal BAT can be forced to pull down the voltage of the power output terminal BAT when the voltage of the first power terminal is lower, so as to ensure the discharge safety of the power input terminal LI-BAT.
In an embodiment, the power protection circuit includes an eighth resistor R8, a ninth resistor R9, and a second switch Q2, a first end of the eighth resistor R8 is grounded, a second end of the eighth resistor R8, the controlled end 1 of the second switch Q2, and a first end of the ninth resistor R9 are interconnected; a second end of the ninth resistor R9 is a power end of the power protection circuit, a first end of the second switch tube Q2 is a first end 3 of the power protection circuit, and a second end 2 of the second switch tube Q2 is a second end of the power protection circuit.
The principle of the present invention is explained below with reference to fig. 1 and 2:
starting 1, when a power input end LI-BAT is connected with a power supply, such as a battery, a first switch K1 is pressed to start charging a first capacitor C1, the first capacitor C1 is discharged after being fully charged, the discharging voltage is used for opening a first switch tube Q1, at the moment, a collector electrode of the first switch tube Q1 discharges to the ground, and as a third switch tube Q3 is an MOS tube and is P-channel (conducted at a low level) and is connected with the collector electrode of the first switch tube Q1, the third switch tube Q3 is conducted to allow the voltage of the battery to pass through, and the power output end BAT supplies power to each subsequently connected power supply. The machine system is enabled to work, and the first output terminal GPIO20 of the control circuit 40 outputs a high level to the first switch tube Q1, so as to maintain the on state of the first switch tube Q1, and enable the machine to work all the time.
Shutdown 1: when the machine works normally, the first switch K1 (hall switch) is affected by external magnetic force and is closed, the level of the third pin is low, so that the level of the power input end LI-BAT is low, namely, the power input end LI-BAT stops inputting, the control circuit 40 detects that the power input end LI-BAT does not input, and each subsequent working circuit is also powered off, so that the machine is powered off, the first output end GPIOB20 of the control circuit 40 outputs low level, the first switch tube Q1 is cut off by the third switch tube Q3, the power input end LI-BAT is powered off, the power output end BAT is powered off, and the powered system stops working.
And 2, starting the machine, namely when a power input end LI-BAT is connected with a power supply, pressing a first switch K1, and then pressing a second switch K2 (a touch switch) to enable a third diode to discharge to the ground to be low, wherein the third switching tube Q3 is an MOS tube and is P-channel (low level conduction) and is connected with the third diode, so that the third switching tube Q3 is conducted to enable the voltage of the battery to pass through, and the power output end BAT supplies power to all circuits of power supplies to enable the machine system to work, and a first output end GPIOB20 of the control circuit 40 outputs high power to the first switching tube Q1 to maintain the conduction state of the first switching tube Q1 to enable the machine to work all the time.
Shutdown 2: when the machine works normally and the first switch K1 is pressed again, the third diode changes from high level to low level, the GPIOB28 at the detection end of the control circuit 40 is a system detection port, and when low power is detected, the software can change the output of the first output end GPIOB20 of the control circuit 40 from high level to low power, so that the first switch tube Q1 is cut off, the third switch tube Q3 is also cut off, and the power supply output end BAT is powered off. The machine is powered off and the system stops working.
Therefore, the stable output of the power output terminal BAT is maintained. The technical problem that a power supply path can not be kept on for a long time when an existing switch is started is solved.
In order to achieve the above object, the present invention further provides a working circuit, where the working circuit includes an energy storage component, a working component, and the start-up circuit as described above, and the start-up circuit is disposed between the energy storage component and the working component.
It should be noted that, since the working circuit of the present application includes all the steps of the above-mentioned boot starting circuit, the working circuit can also implement all the schemes of the boot starting circuit, and has the same beneficial effects, and details are not described herein.
The energy storage component can be a battery, a lithium battery and other power supply components, and the working component can be various working circuits of the electronic equipment.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
Claims (8)
1. A power-on circuit, comprising:
the power supply input end is used for accessing a power supply;
a power output terminal for outputting the power;
the first key circuit is used for outputting a corresponding first electric signal according to an external key signal;
the first pull-down circuit is provided with a first end, a second end, a first controlled end and a second controlled end, the first end of the first pull-down circuit is grounded, and the first controlled end of the first pull-down circuit is connected with the output end of the first key circuit and is used for outputting a corresponding second electric signal according to the first electric signal;
a first switch circuit, a first end of which is connected to the power input end, a second end of which is connected to the power output end, and a controlled end of which is connected to the second end of the first pull-down circuit, and controls the first switch circuit to be turned on or off according to the second electrical signal, so as to control a path between the power input end and the power output end to be turned on or off;
the power end of the control circuit is connected with the power output end, and the first output end of the control circuit is connected with the second controlled end of the first pull-down circuit and used for outputting a corresponding third electric signal according to the voltage of the power output end so as to ensure that the first pull-down circuit outputs a second electric signal corresponding to the initial first electric signal and maintain the stable output of the power output end;
the first pull-down circuit comprises a first charging module and a first pull-down module, wherein the input end of the first charging module is a first controlled end of the first pull-down circuit, and the output end of the first charging module is connected with a second controlled end of the first pull-down circuit; the first end of the first pull-down module is a first end of the first pull-down circuit, and the second end of the first pull-down module is a second end of the first pull-down circuit;
the first charging module is used for being charged when the current of the first electric signal is larger than zero and discharging when the charging amount exceeds the capacitance of the first charging module;
the first pull-down module is configured to pull down a voltage of the second end of the first pull-down circuit to a ground voltage when the first charging module discharges;
the first charging module comprises a first capacitor, a first diode, a second diode, a first resistor, a second resistor, a first power supply end and a third resistor, wherein a first end of the first capacitor is an input end of the first charging module, and a second end of the first capacitor, a cathode of the first diode and a first end of the first resistor are interconnected; the first end of the second resistor, the second end of the first resistor and the first end of the third resistor are interconnected, and the connection node of the second resistor, the second end of the first resistor and the first end of the third resistor is the output end of the first charging module; the second end of the third resistor and the anode of the first diode are both grounded; the cathode of the second diode is connected with the second end of the second resistor, and the anode of the second diode is connected to the first power supply end.
2. The power-on start-up circuit of claim 1, wherein the first pull-down module comprises a second capacitor, a first switch tube and a fourth resistor, the first end of the first switch tube is the first end of the first pull-down module, the second end of the first switch tube, the first end of the second capacitor and the first end of the fourth resistor are connected, and the controlled end of the first switch tube is the controlled end of the first pull-down module; the second end of the second capacitor is grounded; a second end of the fourth resistor is a second end of the first pull-down module.
3. A power-on start-up circuit as claimed in claim 1, wherein the power-on start-up circuit further comprises a second key circuit and a second pull-down circuit, the control circuit further comprises a sampling terminal, a first terminal of the second key circuit is connected to ground, a second terminal of the second key circuit is connected to an input terminal of the second pull-down circuit, and a detection terminal of the second key circuit is connected to the sampling terminal of the control circuit; the output end of the second pull-down circuit is connected with the controlled end of the first switch circuit;
the second key circuit is used for switching on or off according to an external key signal;
the second pull-down circuit is used for working when the second key circuit is conducted so as to pull down the voltage of the output end of the second pull-down circuit;
the control circuit is also used for detecting the voltage of the detection end of the second key circuit.
4. The power-on start circuit according to claim 3, wherein the second key circuit comprises a second switch, a third diode, a fifth resistor and a sixth resistor, the first terminal of the second switch is the first terminal of the second key circuit, the second terminal of the second switch is connected to the cathode of the third diode, and the connection node is the second terminal of the second key circuit; the anode of the third diode is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the first end of the sixth resistor, the connection node of the fifth resistor is the detection end of the second key circuit, and the second end of the sixth resistor is connected to the power supply.
5. The power-on start-up circuit of claim 3, wherein the second pull-down circuit comprises a fourth diode and a seventh resistor, a cathode of the fourth diode is an input terminal of the second pull-down circuit, an anode of the fourth diode is connected with a first terminal of the seventh resistor, and a second terminal of the seventh resistor is an output terminal of the second pull-down circuit.
6. A power-on startup circuit as claimed in claim 1, characterized in that said power-on startup circuit further comprises a power protection circuit and a second power supply terminal, the power supply terminal of said power protection circuit being connected to said second power supply terminal, a first terminal of said power protection circuit being connected to a second terminal of said first switching circuit, a second terminal of said power protection circuit being connected to said power supply output terminal.
7. The power-on start-up circuit of claim 6, wherein the power protection circuit comprises an eighth resistor, a ninth resistor and a second switch tube, a first terminal of the eighth resistor is connected to ground, a second terminal of the eighth resistor, a controlled terminal of the second switch tube and a first terminal of the ninth resistor are interconnected; the second end of the ninth resistor is a power supply end of the power supply protection circuit, the first end of the second switching tube is a first end of the power supply protection circuit, and the second end of the second switching tube is a second end of the power supply protection circuit.
8. An operating circuit comprising an energy storage component, an operating component, and a power-on circuit as claimed in any one of claims 1 to 7, the power-on circuit being disposed between the energy storage component and the operating component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210235040.9A CN114531022B (en) | 2022-03-10 | 2022-03-10 | Starting-up circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210235040.9A CN114531022B (en) | 2022-03-10 | 2022-03-10 | Starting-up circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN114531022A CN114531022A (en) | 2022-05-24 |
| CN114531022B true CN114531022B (en) | 2023-03-14 |
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| CN202210235040.9A Active CN114531022B (en) | 2022-03-10 | 2022-03-10 | Starting-up circuit and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205249167U (en) * | 2015-12-24 | 2016-05-18 | 深圳市拓普泰克电子有限公司 | Switch circuit and electronic equipment |
| CN208207726U (en) * | 2018-04-26 | 2018-12-07 | Tcl通力电子（惠州）有限公司 | The reset electrification circuit and electronic product of electronic product |
| CN110784201A (en) * | 2019-11-04 | 2020-02-11 | 深圳市华思旭科技有限公司 | NMOS switch drive circuit and power supply device |
| CN211089628U (en) * | 2019-11-26 | 2020-07-24 | 中移物联网有限公司 | Power-on and power-off circuit of terminal |
| CN113517884A (en) * | 2021-06-24 | 2021-10-19 | 深之蓝(天津)水下智能科技有限公司 | Equipment on-off control circuit |
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