CN211293696U - Time-delay self-locking power switch circuit and control device - Google Patents
Time-delay self-locking power switch circuit and control device Download PDFInfo
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- CN211293696U CN211293696U CN202020035798.4U CN202020035798U CN211293696U CN 211293696 U CN211293696 U CN 211293696U CN 202020035798 U CN202020035798 U CN 202020035798U CN 211293696 U CN211293696 U CN 211293696U
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Abstract
The utility model discloses a time delay auto-lock switch circuit, it includes power, electronic switch module, dabs switch module, auto-lock control module and MCU control module. The light touch switch module sends a touch signal to the self-locking control module; the self-locking control module sends a self-locking signal to the electronic switch module according to the trigger signal so as to control the on-off of the electronic switch module and maintain a self-locking state; the MCU control module sends a state signal when first set time is reached so as to turn off the self-locking control module and enable the self-locking control module to send a turn-off control signal to the electronic switch module; the electronic switch module controls the on-off of the power supply according to the self-locking signal and cuts off the power supply according to the turn-off control signal. The utility model also discloses a time delay auto-lock switch controlling means, it has included external device and time delay auto-lock switch circuit. The utility model discloses a dab the auto-lock mode of switch, small and do not produce the leakage current, can also regularly shut down simultaneously.
Description
Technical Field
The utility model relates to the field of switch technology, concretely relates to time delay auto-lock switch circuit and controlling means.
Background
Most of the existing handheld external devices are designed to be small and exquisite as much as possible so as to be convenient to carry, so a dry battery or a button battery is generally adopted for supplying power, and the battery endurance of the handheld external devices is particularly important. In practical application, most customers often forget to turn off the power supply after using the handheld external device, so that the problem of power failure after long-time standby occurs.
How to improve battery endurance? Under the condition that the battery capacity is determined, on one hand, the battery endurance can be improved by reducing the working current of the external equipment, and on the other hand, the battery endurance can be improved by a method of automatically cutting off the power supply under the condition that the external equipment is not used for a long time. Additionally, most handheld external devices generally use physical switches, such as a boat-type switch and a self-locking mechanical switch. The mechanical switch has large volume, unnecessary volume and weight can be added to equipment, and meanwhile, the electronic switch also has the defects of complex circuit and poor stability.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model aims at providing a time delay auto-lock switch circuit and controlling means aims at solving the make-up or the disconnection of how to control external equipment power and can maintain the state of making-up or breaking, can also regularly cut off power's problem under the condition of not using for a long time simultaneously.
(II) technical scheme
In order to achieve the above object, the utility model provides a time delay auto-lock switch circuit, include:
the system comprises a power supply, an electronic switch module, a light touch switch module, a self-locking control module and an MCU (microprogrammed control Unit) control module; the power supply, the light touch switch module and the self-locking control module are all electrically connected with the electronic switch module, and the light touch switch module and the MCU control module are all electrically connected with the self-locking control module;
the light touch switch module sends a touch signal to the self-locking control module so as to control the on-off of the self-locking control module;
the self-locking control module generates a self-locking signal according to the trigger signal and sends the self-locking signal to the electronic switch module so as to control the on-off of the electronic switch module and maintain the on-off state of the electronic switch module;
the MCU control module sends a state signal to the self-locking control module when first set time is reached so as to be used for turning off the self-locking control module and enabling the self-locking control module to send a turning-off control signal to the electronic switch module;
the electronic switch module controls the input and the cut-off of the power supply according to the self-locking signal and cuts off the power supply according to the cut-off control signal.
Preferably, the device also comprises a power supply modulation module and a voltage acquisition module;
the power supply modulation module is electrically connected with the electronic switch module, the voltage acquisition module and the MCU control module and is used for generating an adjusting voltage according to the output voltage of the electronic switch module and sending the adjusting voltage to the MCU control module and the voltage acquisition module for use;
the voltage acquisition module is also electrically connected with the MCU control module and is used for obtaining sampling voltage after the sampling of the MCU control module and sending the sampling voltage to a timer of the MCU control module for use.
Preferably, the MCU control module sets the signal of the signal pin EN _ ADC of the voltage acquisition module to a low level every second set time.
Preferably, the power supply comprises a plurality of dry batteries or button batteries connected in series and parallel;
the electronic switch module comprises a seventh MOS transistor and a seventy-nine resistor, wherein the seventy-nine resistor is arranged between a grid electrode and a source electrode of the seventh MOS transistor;
the light touch switch module comprises a light touch switch, a plurality of voltage division resistors and a plurality of grounding capacitors; the grounding capacitors comprise a twenty eighth grounding capacitor arranged at the input end of the light touch switch module and a forty second grounding capacitor arranged at the output end of the light touch switch module;
the self-locking control module comprises a thirteenth MOS tube, a plurality of divider resistors and a one hundred eleventh bridging resistor; the plurality of voltage dividing resistors comprise an eighty-fifth voltage dividing resistor arranged at the power supply input end of the automatic lock control module and an eighty-fourth voltage dividing resistor arranged at the state signal input end; the first one hundred eleventh bridging resistor is arranged between the grid electrode and the source electrode of the thirteenth MOS tube;
the MCU control module comprises an MCU and a peripheral circuit, and an ADC acquisition unit is arranged in the MCU;
the power supply modulation module comprises a power supply chip;
the voltage acquisition module comprises a first triode, a first resistor, an eighty voltage division resistor and an eighty voltage division resistor, wherein the first resistor is arranged on a signal pin EN _ ADC of the voltage acquisition module and is connected to a base electrode of the first triode; the eighty voltage-dividing resistor and the eighty voltage-dividing resistor are connected to the collector of the first triode in series.
Preferably, the trigger signal comprises an on trigger signal and an off trigger signal;
the self-locking signal comprises a switching-on self-locking signal and a switching-off self-locking signal;
the state signal is a low level state signal.
Preferably, the seventh MOS transistor is a P-channel MOS transistor;
the thirteenth MOS tube is an N-channel MOS tube;
the power supply chip is a linear voltage stabilizer.
Preferably, when the electronic switch module is turned off, a power supply voltage charges the twenty-eighth ground capacitor through the seventy-ninth resistor, the eighty-third voltage-dividing resistor and the eighty-third voltage-dividing resistor;
when the electronic switch module is turned on, the twenty-eighth grounded capacitor is discharged through the eighty-eighth voltage-dividing resistor.
Preferably, the self-locking control module realizes the function of automatically turning off the power supply at low voltage by adjusting the resistance value of the eighty-five voltage-dividing resistor and the resistance value of the one hundred eleven bridging resistor.
Preferably, a forty-sixth capacitor is arranged at the interface of the power supply, one end of the forty-sixth capacitor is connected with the common end of the parallel connection of the power supply, and the other end of the forty-sixth capacitor is grounded.
Additionally, the utility model also provides a time delay auto-lock switch control device, include: the time-delay self-locking power supply switch circuit is connected with the external equipment.
(III) advantageous effects
The utility model has the advantages that: the utility model provides a time delay auto-lock switch circuit, it has included power, electronic switch module, has dabbed switch module, from lock control module, power modulation module, voltage acquisition module, MCU control module. The power supply is connected with the electronic switch module, the on-off of the electronic switch module directly controls the connection and the disconnection of the power supply, and meanwhile, the power supply supplies power to other modules through the electronic switch module. The electronic switch has the advantages of high switching speed, extremely low damage rate compared with a mechanical switch, convenient replacement and great practicability and economy. When the light touch switch module is not conducted, the electronic switch module is not conducted, so that the external equipment is not connected with a power supply and is in a power-off state; when a tact switch in the tact module is pressed for the first time, the tact switch module sends a conduction trigger signal to the self-locking control module. The self-locking control module is conducted after receiving the conduction trigger signal and sends a conduction self-locking signal to the electronic switch module, and the electronic switch module receives the conduction self-locking signal to achieve a conduction condition, so that the external equipment is connected to a power supply. Meanwhile, after the electronic switch module is switched on, the self-locking control module is connected to the back-stage voltage VBAT to further maintain the conduction state of the electronic switch module; when a tact switch in the tact module is pressed secondly, the tact switch module sends a turn-off trigger signal to the self-locking control module. The self-locking control module is turned off after receiving the turn-off trigger signal and sends a turn-off self-locking signal to the electronic switch module to control the electronic switch module to be turned off, so that the power supply of the external equipment is cut off. The utility model discloses a dab the switch and compare in other switch, especially physical switch has small, the good advantage of stability as switch, dabs the switch.
The MCU control module can realize the adjustable timing shutdown function, and generally two methods can be adopted, one is a method of utilizing a software delay program or an internal timer, and the other is a method of pulse width modulation. And the utility model discloses a first mode, be in not operating for a long time when equipment promptly, when reaching the inside first settlement time T1 who sets for of MCU control module, MCU control module can send status signal and come control auto-lock control module to turn-off, and auto-lock control module sends turn-off control signal and gives the electronic switch module, and the electronic switch module received turn-off control signal this moment, will turn-off to accomplish the timing shutdown of equipment. The timing operation can be completed without the participation of a light touch switch module, namely, the timing operation does not need to be operated by people, the power supply of the sensing equipment is cut off when the sensing equipment is not used for a long time, the energy consumption is saved, and the endurance time is prolonged.
Drawings
Fig. 1 is a detailed flowchart of a delay self-locking power switch circuit according to an embodiment of the present invention;
fig. 2 is a specific circuit diagram of a delay self-locking power switch circuit according to an embodiment of the present invention.
[ description of reference ]
Q7: a seventh MOS transistor; r79: a seventy-ninth resistor;
s13; a tact switch; r83: an eighty-third voltage dividing resistor; r81: an eighty-th voltage dividing resistor;
c28: a twenty-eighth grounded capacitor; c42: a forty-second ground resistor;
u13: a thirteenth MOS transistor; r85: an eighty-fifth voltage-dividing resistor; r84: an eighty-fourth voltage dividing resistor; r111: a one hundred eleven bridge resistor;
q1: a first tertiary pipe; r1: a first resistor; r80: an eighty voltage dividing resistor; r82: an eighty-th voltage dividing resistor.
Detailed Description
For better explanation of the present invention, in order to facilitate understanding, the present invention will be described in further detail below with reference to the accompanying drawings by way of specific embodiments.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
A time-delay self-locking power switch circuit comprises: the system comprises a power supply, an electronic switch module, a light touch switch module, a self-locking control module and an MCU (microprogrammed control Unit) control module; the power supply, the light touch switch module and the self-locking control module are electrically connected with the electronic switch module, and the light touch switch module and the MCU control module are electrically connected with the self-locking control module; the light touch switch module sends a touch signal to the self-locking control module so as to control the on-off of the self-locking control module; the self-locking control module generates a self-locking signal according to the trigger signal and sends the self-locking signal to the electronic switch module so as to control the on-off of the electronic switch module and maintain the on-off state of the electronic switch module; the MCU control module sends a state signal to the self-locking control module when the first set time T1 is reached so as to be used for turning off the self-locking control module and enabling the self-locking control module to send a turning-off control signal to the electronic switch module; the electronic switch module controls the input and cut-off of the power supply according to the self-locking signal and cuts off the power supply according to the cut-off control signal.
As shown in fig. 1, an embodiment of the present invention provides a time-delay self-locking power switch circuit, which includes a power supply, an electronic switch module, a light touch switch module, an automatic locking control module, a power supply modulation module, a voltage acquisition module, and an MCU control module. The power supply is connected with the electronic switch module, the on-off of the electronic switch module directly controls the connection and the disconnection of the power supply, and meanwhile, the power supply supplies power to other modules through the electronic switch module. The electronic switch has the advantages of high switching speed, extremely low damage rate compared with a mechanical switch, convenient replacement and great practicability and economy. When the light touch switch module is not conducted, the electronic switch module is not conducted, so that the external equipment is not connected with a power supply and is in a power-off state; when the tact switch S13 in the tact module is pressed for the first time, the tact switch module sends a conduction trigger signal to the self-locking control module. The self-locking control module is conducted after receiving the conduction trigger signal and sends a conduction self-locking signal to the electronic switch module, and the electronic switch module receives the conduction self-locking signal to achieve a conduction condition, so that the external equipment is connected to a power supply.
Meanwhile, after the electronic switch module is switched on, the self-locking control module is connected to the back-stage voltage VBAT to further maintain the conduction state of the electronic switch module; when the tact switch S13 in the tact module is pressed next, the tact switch module sends an off trigger signal to the self-locking control module. The self-locking control module is turned off after receiving the turn-off trigger signal and sends a turn-off self-locking signal to the electronic switch module to control the electronic switch module to be turned off, so that the power supply of the external equipment is cut off. In this embodiment, the tact switch S13 is used as the power switch, and the tact switch S13 has advantages of small size and good stability compared with other power switches, especially physical switches.
The MCU control module can realize the adjustable timing shutdown function, and generally two methods can be adopted, one is a method of utilizing a software delay program or an internal timer, and the other is a method of pulse width modulation. And adopt the first mode in this embodiment, do not operate for a long time when external equipment, reach the inside first settlement time T1 who sets for of MCU control module promptly, MCU control module can send status signal to auto-lock control module and control auto-lock control module and turn off, and auto-lock control module sends and shuts off control signal and gives the electronic switch module, and the electronic switch module receives the shutoff control signal this moment, will turn off to accomplish external equipment's timing shutdown. The timing operation can be completed without the participation of a light touch switch module, namely, the timing operation does not need to be operated by people, the power supply of the external equipment is cut off when the external equipment is sensed not to be used for a long time, the energy consumption is saved, and the endurance time is prolonged.
Meanwhile, the time-delay self-locking power switch circuit provided by the embodiment of the utility model also comprises a power modulation module and a voltage acquisition module; the power supply modulation module is electrically connected with the electronic switch module, the voltage acquisition module and the MCU control module and is used for generating an adjusting voltage according to the output voltage of the electronic switch module and sending the adjusting voltage to the MCU control module and the voltage acquisition module for use; the voltage acquisition module is also electrically connected with the MCU control module and is used for obtaining sampling voltage for the timer of the MCU control module to use after being sampled by the MCU control module. The power supply modulation module generates adjustment voltage to the voltage acquisition module and the MCU control module in a boosting or reducing mode. And meanwhile, the voltage acquisition module provides sampling voltage for the MCU control module to be used by a timer of the MCU control module.
Then, the MCU control module sets the signal of the signal pin EN _ ADC of the voltage acquisition module to a low level every second set time T2. When the external equipment is in a state of being connected with a power supply, the MCU control module sets a signal pin EN _ ADC of the sampling circuit to be at a low level every second set time T2, so that the first triode Q1 is conducted, then the voltage sampling pin VBAT _ ADC of the voltage acquisition module has voltage, the sampling voltage is obtained after the sampling by the MCU control module, the MCU control module receives the sampling voltage, the timing is started when the external equipment is not operated, the power supply is cut off when the first set time T1 is reached, and the timing shutdown of the external equipment is completed.
As shown in fig. 2, the power supply includes a plurality of dry cells or button cells connected in series and parallel; the electronic switch module comprises a seventh MOS transistor Q7 and a seventy-ninth resistor R79, wherein the seventy-ninth resistor R79 is arranged between the grid and the source of the seventh MOS transistor Q7; the touch switch module comprises a touch switch S13, a plurality of voltage division resistors and a plurality of capacitors; the plurality of voltage division resistors comprise an eighty-third voltage division resistor R83 and an eighty-third voltage division resistor R81 which are arranged at the input end of the light touch switch module in a series connection mode, and the plurality of capacitors comprise a twenty-eighth grounding capacitor C28 arranged at the input end of the light touch switch module and a forty-second grounding capacitor C42 arranged at the output end of the light touch switch module; the self-locking control module comprises a thirteenth MOS tube U13, a plurality of voltage division resistors and a one hundred eleven bridging resistor R111; the plurality of voltage dividing resistors comprise an eighty-fifth voltage dividing resistor R85 arranged at the power supply input end of the automatic lock control module and an eighty-fourth voltage dividing resistor R84 arranged at the state signal input end; the one hundred eleventh bridging resistor R111 is disposed between the gate and the source of the thirteenth MOS transistor U13; the MCU control module comprises an MCU and a peripheral circuit, wherein an ADC acquisition unit is arranged in the MCU; the power supply modulation module comprises a power supply chip; the voltage acquisition module comprises a first triode Q1, a first resistor R1, an eighty voltage division resistor R80 and an eighty voltage division resistor R82, wherein the first resistor is arranged on a signal pin EN _ ADC of the voltage acquisition module and is connected to a base electrode of the first triode; the eighty voltage-dividing resistor and the eighty voltage-dividing resistor are connected to the collector of the first triode in a series connection mode, and the voltage sampling pin VBAT _ ADC of the voltage acquisition module is led out from the connection position of the eighty voltage-dividing resistor and the eighty voltage-dividing resistor.
Then, the trigger signal comprises a switch-on trigger signal and a switch-off trigger signal; the self-locking signal comprises a switching-on self-locking signal and a switching-off self-locking signal; the state signal is a low-level state signal. When the tact switch is pressed down for the first time, the trigger signal at the moment is a conduction trigger signal for controlling the conduction of the self-locking control module; when the tact switch is pressed down for the second time, the trigger signal at the moment is a turn-off trigger signal for controlling the self-locking control module to turn off. When the self-locking control module is switched on, a switching-on self-locking signal is sent out to control the electronic switch module to be switched on; and when the self-locking control module is switched off, a switching-off self-locking signal is sent out to control the electronic switch module to be switched off. When the external equipment is powered on, a System _ Power _ off signal on a signal pin of the automatic lock control module is input into the MCU control module; when the external device is not operated for a long time and reaches the first set time T1, the MCU control module will change the System _ Power _ off signal from the input state to the output state and set it to a low level, thereby completing the timed shutdown.
Moreover, the seventh MOS transistor Q7 is a P-channel MOS transistor; the thirteenth MOS tube U13 is an N-channel MOS tube; the MCU is an STM32L051R8T6-LQFP64 singlechip; the power supply chip is a linear voltage stabilizer with the model number of TPS7A7001 DDAR. A seventh MOS transistor Q7 is connected to the power supply bus, and in consideration of a large operating voltage, a P-channel MOS transistor is selected in the present embodiment; and the source of the thirteenth MOS tube U13 is grounded, so that an N-channel MOS tube is adopted. The MCU uses STM32L051R8T6-LQFP64 singlechip, the integration level is high, the peripheral circuit is simple and easy to debug, and a plurality of ADC sampling channels are arranged in the MCU. And the power supply modulation module adopts a step-down LDO circuit and uses a TPS7A7001DDARD power supply chip, so that the peripheral circuit is simple, the power consumption is low and the power supply is stable.
Secondly, when the electronic switch module is turned off, the power supply voltage VBAT _ IN charges a twenty-eighth ground capacitor C28 through a seventy-ninth resistor R79, an eighty-eighth voltage-dividing resistor R83 and an eighty-eighth voltage-dividing resistor R81; when the electronic switching module is turned on, the twenty-eighth grounded capacitor C28 is discharged through the eighty-first voltage-dividing resistor R81. When the switching module is turned off, that is, the seventh MOS transistor Q7 is turned off, the power supply voltage VBAT _ IN is not connected, and at this time, the power supply voltage VBAT _ IN charges the twenty-eighth ground capacitor C28 through the charging unit, and the potential of the capacitor is high. And the charging time ═ the value of (the value of the seventy-ninth resistance R79 + the value of the eighty-third voltage dividing resistance R83 + the value of the eighty-third voltage dividing resistance R81) × the value of the twenty-eighth ground capacitance C28. And after the power is switched on, the capacitance on the twenty-eighth grounding capacitor C28 is discharged through the eighty-first voltage-dividing resistor R81.
Then, the self-locking control module realizes the function of automatically turning off the power supply at low voltage by adjusting the resistance value of the eighty-five voltage-dividing resistor R85 and the resistance value of the one hundred eleven resistor. And adjusting the resistance of the eighty-fifth voltage-dividing resistor R85 and the resistance of the one-hundred-eleven resistor R111 to control the thirteenth MOS tube U13 to be turned off, and further control the electronic switch module to be turned off and cut off the power supply.
Furthermore, a forty-sixth capacitor is arranged at the interface of the power supply, one end of the forty-sixth capacitor is connected with the common end of the parallel connection position of the power supply, and the other end of the forty-sixth capacitor is grounded. And a forty-sixth capacitor is additionally arranged, so that instantaneous current is increased, and the power supply capacity of a power supply is improved.
Additionally, the utility model also provides a time delay auto-lock switch controlling means, it includes external device and time delay auto-lock switch circuit, and time delay auto-lock switch circuit is connected with external device, and the power is the external device power supply. The time-delay self-locking power switch circuit performs self-locking control on the external equipment through the tact switch S13, and realizes the function of automatically cutting off the power supply when the external equipment is not operated for a long time through the timing control of the MCU control module.
To sum up, the utility model discloses a touch switch module controls auto-lock control module, and then controls electronic switch module's break-make to the break-make that can keep electronic switch module also is exactly to realize self-locking function. And when the external equipment is not operated for a long time and reaches the first set time T1, the MCU control module turns off the electronic switch module by turning off the self-locking control module. The power supply modulation module generates an adjusting voltage according to the input voltage of the electronic switch module and sends the adjusting voltage to the power supply modulation module and the voltage acquisition module for use. The MCU control module defines a variable, namely a first set time T1 in a singlechip program by controlling a signal pin of the automatic control module through a thirteenth MOS tube U13, the System clears the first set time T1 when in use every time, the System is automatically accumulated by using a timer of the singlechip when the System is not used, and a System _ Power _ off signal for controlling the signal pin of the automatic control module is turned over when the first set time T1 is reached, so that the electronic switch module is controlled to be turned off, and the Power supply of external equipment is cut off.
And simultaneously the utility model also provides a time delay auto-lock switch controlling means, it includes external equipment and as above time delay auto-lock switch circuit, time delay auto-lock switch is connected with external equipment, the power is the external equipment power supply.
The utility model discloses a dab the auto-lock mode of switch, it is small, the switch is sensitive, and the reliability is high, can cut off power supply circuit completely, can not produce the problem of unnecessary leakage current. Meanwhile, the timing shutdown function is provided, and the first set time T1 can be set according to the needs of the user.
The specific working process of the embodiment of the present invention is as follows: the power voltage VBAT _ IN is connected to pin 1 (G pole) of the seventh MOS transistor Q7 through the seventh nineteenth resistor R79, and pin 1 (G pole) of the seventh MOS transistor Q7 is at a high level, so that the seventh MOS transistor Q7 is not conductive. At this time, the power voltage VBAT _ IN is cut off, and the external device is not connected to the power supply and is IN a shutdown state. The power supply voltage VBAT _ IN charges the twenty-eighth ground capacitor C28 through the seventy-ninth resistor R79, the eighty-third voltage-dividing resistor R83, and the eighty-third voltage-dividing resistor R81, where one end of the capacitance of the twenty-eighth ground capacitor C28 is at a high level and the other end is grounded, and the charging time is (the value of the seventy-ninth resistor R79 + the value of the eighty-third voltage-dividing resistor R83 + the value of the eighty-third voltage-dividing resistor R81) × the value of the twenty-eighth ground capacitor C28. Meanwhile, in order to ensure that the seventh MOS transistor Q7 can perform switching stably and reliably at any time and any place, the resistors and capacitors in the electronic switch module and the tact switch module need to be adjusted to appropriate values.
When the user presses the tact switch S13, the 2 and 4 pins of the tact switch S13 are turned on. At this time, the voltage across the twenty-eighth grounded capacitor C28 is at a high level, and the capacitor voltage cannot suddenly change, so that the high-level voltage across the twenty-eighth grounded capacitor C28 reaches the pin 1 (G pole) of the thirteenth MOS transistor U13 in an instant on state of the tact switch S13, and thus the voltage difference between the pin 1 and the pin 2 of the thirteenth MOS transistor U13 exceeds the gate-source turn-on voltage of the thirteenth MOS transistor U13, and the thirteenth MOS transistor U13 is turned on. At this time, pin 3 of the thirteenth MOS transistor U13 is low. When the power is switched on, the voltage of the twenty-eighth ground capacitor C28 is discharged through the eighty-first voltage-dividing resistor R81, and at the same time, the power voltage VBAT _ IN is divided through the seventy-ninth resistor R79 and the eighty-third voltage-dividing resistor R83, so that the voltage drop across the seventy-ninth resistor R79 reaches the turn-on voltage of the seventh MOS transistor Q7, so that the seventh MOS transistor Q7 is turned on, the power voltage VBAT _ IN is turned on through the seventh MOS transistor Q7, and at this time, the voltage of the later-stage voltage VBAT is divided through the eighty-fifth voltage-dividing resistor R85 and the first hundred-eleventh bridging resistor R111, so that the turn-on state of the thirteenth MOS transistor U13 is further consolidated, and a power-on operation of the external device is completed.
After the power is turned on, the capacitance of the twenty-eighth grounding capacitor C28 is discharged through the eighty-first voltage divider resistor R81, and the voltage of the twenty-eighth grounding capacitor C28 is at a low level.
When the user presses the tact switch S13 again, the voltage across the twenty-eighth grounded capacitor C28 cannot change abruptly, so that the low-level voltage across the twenty-eighth grounded capacitor C28 reaches the pin 1 (G pole) of the thirteenth MOS transistor MU13 through the tact switch S13 in the state of being instantly turned on, and thus the voltage difference between the pin 1 and the pin 2 of the thirteenth MOS transistor U13 is zero, and the thirteenth MOS transistor U13 is turned off. At this time, the power voltage VBAT _ IN charges the twenty-eighth ground capacitor C28 through the seventy-ninth resistor R79, the eighty-third voltage-dividing resistor R83, and the eighty-third voltage-dividing resistor R81, and the thirteenth MOS tube U13 is turned off, and at this time, the voltage drop between pin 1 and pin 2 of the seventh MOS tube Q7 is divided by the seventy-ninth resistor R79, the eighty-third voltage-dividing resistor R83, and the eighty-third voltage-dividing resistor R81 and is smaller than the turn-on voltage, so that the seventh MOS tube Q7 is turned off, and the power supply of the external device is turned off. And finishing a shutdown action.
After a user starts the power supply of the external device, the MCU control module sets a signal of a signal pin EN _ ADC of the voltage acquisition module to be a low level every a second set time T2, a voltage of a later-stage voltage VBAT passes through the first triode Q1, and is divided after passing through the eighty voltage dividing resistor R80 and the eighty voltage dividing resistor R82, and the voltage of the voltage sampling pin VBAT _ ADC of the voltage acquisition module is sampled by an ADC sampling unit of the MCU control module to obtain a sampling voltage for the MCU control module to use. The MCU control module starts timing, when the external device is not operated for a long time and the timing is accumulated to the first set time T1, the MCU control module will change the System _ Power _ off signal on the signal pin of the self-locking control module from the input state to the output state, and set the System _ Power _ off signal to a low level, so as to control the thirteenth MOS tube U13 to turn off, at this time, the voltage drop between pin 1 and pin 2 of the seventh MOS tube Q7 is divided by the seventy-nine resistor R79, the eighty-three voltage resistor R83 and the eighty-one voltage dividing resistor R81 and is smaller than the turn-on voltage, so the seventh MOS tube Q7 is turned off, and the Power of the external device is turned off. And finishing a timing shutdown action.
Claims (10)
1. A time delay auto-lock power switch circuit which characterized in that includes: the system comprises a power supply, an electronic switch module, a light touch switch module, a self-locking control module and an MCU (microprogrammed control Unit) control module; the power supply, the light touch switch module and the self-locking control module are all electrically connected with the electronic switch module, and the light touch switch module and the MCU control module are all electrically connected with the self-locking control module;
the light touch switch module sends a touch signal to the self-locking control module so as to control the on-off of the self-locking control module;
the self-locking control module generates a self-locking signal according to the trigger signal and sends the self-locking signal to the electronic switch module so as to control the on-off of the electronic switch module and maintain the on-off state of the electronic switch module;
the MCU control module sends a state signal to the self-locking control module when first set time is reached so as to be used for turning off the self-locking control module and enabling the self-locking control module to send a turning-off control signal to the electronic switch module;
the electronic switch module controls the input and the cut-off of the power supply according to the self-locking signal and cuts off the power supply according to the cut-off control signal.
2. The time-delay self-locking power switch circuit according to claim 1, further comprising a power modulation module and a voltage acquisition module;
the power supply modulation module is electrically connected with the electronic switch module, the voltage acquisition module and the MCU control module and is used for generating an adjusting voltage according to the output voltage of the electronic switch module and sending the adjusting voltage to the MCU control module and the voltage acquisition module for use;
the voltage acquisition module is also electrically connected with the MCU control module and is used for obtaining sampling voltage after the sampling of the MCU control module and sending the sampling voltage to a timer of the MCU control module for use.
3. The time-delay self-locking power switch circuit according to claim 2, wherein the MCU control module sets the signal of the signal pin EN _ ADC of the voltage acquisition module to a low level every second set time.
4. The time-delay self-locking power switch circuit of claim 2,
the power supply comprises a plurality of dry batteries or button batteries connected in series and parallel;
the electronic switch module comprises a seventh MOS transistor and a seventy-nine resistor, wherein the seventy-nine resistor is arranged between a grid electrode and a source electrode of the seventh MOS transistor;
the light touch switch module comprises a light touch switch, a plurality of voltage division resistors and a plurality of grounding capacitors; the grounding capacitors comprise a twenty eighth grounding capacitor arranged at the input end of the light touch switch module and a forty second grounding capacitor arranged at the output end of the light touch switch module;
the self-locking control module comprises a thirteenth MOS tube, a plurality of divider resistors and a one hundred eleventh bridging resistor; the plurality of voltage dividing resistors comprise an eighty-fifth voltage dividing resistor arranged at the power supply input end of the automatic lock control module and an eighty-fourth voltage dividing resistor arranged at the state signal input end; the first one hundred eleventh bridging resistor is arranged between the grid electrode and the source electrode of the thirteenth MOS tube;
the MCU control module comprises an MCU and a peripheral circuit, and an ADC acquisition unit is arranged in the MCU;
the power supply modulation module comprises a power supply chip;
the voltage acquisition module comprises a first triode, a first resistor, an eighty voltage division resistor and an eighty voltage division resistor, wherein the first resistor is arranged on a signal pin EN _ ADC of the voltage acquisition module and is connected to a base electrode of the first triode; the eighty voltage-dividing resistor and the eighty voltage-dividing resistor are connected to the collector of the first triode in series.
5. A time-delay self-locking power switch circuit according to any one of claims 1 to 4,
the trigger signal comprises an on trigger signal and an off trigger signal;
the self-locking signal comprises a switching-on self-locking signal and a switching-off self-locking signal;
the state signal is a low level state signal.
6. The time-delay self-locking power switch circuit according to claim 4,
the seventh MOS tube is a P-channel MOS tube;
the thirteenth MOS tube is an N-channel MOS tube;
the power supply chip is a linear voltage stabilizer.
7. The time-delay self-locking power switch circuit according to claim 4,
when the electronic switch module is turned off, a power supply voltage charges the twenty-eighth grounded capacitor through the seventy-ninth resistor, the eighty-third voltage-dividing resistor and the eighty-third voltage-dividing resistor;
when the electronic switch module is turned on, the twenty-eighth grounded capacitor is discharged through the eighty-eighth voltage-dividing resistor.
8. The time-delay self-locking power switch circuit according to claim 4, wherein the self-locking control module realizes the function of automatically turning off the power supply at low voltage by adjusting the resistance of the eighty-five voltage-dividing resistor and the resistance of the one hundred eleven bridging resistor.
9. The time-delay self-locking power switch circuit according to claim 4, wherein a forty-sixth capacitor is arranged at the interface of the power supply, one end of the forty-sixth capacitor is connected with the common end of the parallel connection of the power supply, and the other end of the forty-sixth capacitor is grounded.
10. A time delay auto-lock switch control device which characterized in that includes: an external device and the delay self-locking power switch circuit as claimed in any one of claims 1-9, wherein the delay self-locking power switch circuit is connected with the external device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020035798.4U CN211293696U (en) | 2020-01-08 | 2020-01-08 | Time-delay self-locking power switch circuit and control device |
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| CN202020035798.4U CN211293696U (en) | 2020-01-08 | 2020-01-08 | Time-delay self-locking power switch circuit and control device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112003600A (en) * | 2020-08-26 | 2020-11-27 | 安徽江淮汽车集团股份有限公司 | Control circuit and method of steering wheel multifunctional switch |
| CN112486072A (en) * | 2020-12-02 | 2021-03-12 | 郑州嘉晨电器有限公司 | Low-power-consumption starting circuit |
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2020
- 2020-01-08 CN CN202020035798.4U patent/CN211293696U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112003600A (en) * | 2020-08-26 | 2020-11-27 | 安徽江淮汽车集团股份有限公司 | Control circuit and method of steering wheel multifunctional switch |
| CN112003600B (en) * | 2020-08-26 | 2022-11-01 | 安徽江淮汽车集团股份有限公司 | Control circuit and method of steering wheel multifunctional switch |
| CN112486072A (en) * | 2020-12-02 | 2021-03-12 | 郑州嘉晨电器有限公司 | Low-power-consumption starting circuit |
| CN112486072B (en) * | 2020-12-02 | 2022-02-25 | 河南嘉晨智能控制股份有限公司 | Low-power-consumption starting circuit |
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Denomination of utility model: A delay self-locking power switch circuit and control device Effective date of registration: 20220803 Granted publication date: 20200818 Pledgee: Bank of Changsha Limited by Share Ltd. science and Technology Branch Pledgor: CHANGSHA SONNEPOWER TECHNOLOGY CO.,LTD. Registration number: Y2022430000067 |
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Date of cancellation: 20231030 Granted publication date: 20200818 Pledgee: Bank of Changsha Limited by Share Ltd. science and Technology Branch Pledgor: CHANGSHA SONNEPOWER TECHNOLOGY CO.,LTD. Registration number: Y2022430000067 |
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