CN219041760U - Startup and shutdown control circuit and control system - Google Patents
Startup and shutdown control circuit and control system Download PDFInfo
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- CN219041760U CN219041760U CN202121908790.5U CN202121908790U CN219041760U CN 219041760 U CN219041760 U CN 219041760U CN 202121908790 U CN202121908790 U CN 202121908790U CN 219041760 U CN219041760 U CN 219041760U
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Abstract
The application provides a startup and shutdown control circuit and a control system, which are used for solving the problems of easy triggering of the startup and shutdown and huge loss. The on-off control circuit comprises a switch detection circuit, a switch, a power supply module, a control module power supply circuit and a power supply output control circuit; the power supply module is connected to the first input end of the control module power supply circuit and the first input end of the power supply output control circuit, the output end of the power supply output control circuit is connected to the electric equipment, and the output end of the control module power supply circuit is connected to the control module; one end of the switch is connected to the first end of the switch detection circuit and the second input end of the control module power supply circuit, the other end of the switch detection circuit is connected to the power supply module, the second end of the switch detection circuit is connected to the first input end of the control module, the first output end of the control module is connected to the third input end of the control module power supply circuit, and the second output end of the control module is connected to the second input end of the power supply output control circuit.
Description
Technical Field
The application relates to the technical field of power supply, in particular to a startup and shutdown control circuit and a control system.
Background
At present, many electronic products in the market generally have a switching function, in order to realize the switching function, a corresponding switching circuit is generally required to be configured for the electronic products, in the traditional scheme, the switching circuit can be switched on and off by simply pressing a key, and the switching circuit is often triggered by incorrect switching on and off due to unstable circuit voltage or careless touch of the key, so that huge loss is caused, and the reliability is low.
Disclosure of Invention
The purpose of the application is to provide a startup and shutdown control circuit and a control system, so as to solve the technical problems of huge loss and low reliability caused by easy triggering of false startup and shutdown actions of the existing startup and shutdown circuit.
The on-off control circuit is used for being connected to electric equipment and comprises an on-off detection circuit, a switch, a power supply module, a control module power supply circuit and a power supply output control circuit;
the power supply module is connected to the first input end of the control module power supply circuit and the first input end of the power supply output control circuit, the output end of the power supply output control circuit is connected to the electric equipment, and the output end of the control module power supply circuit is connected to the control module;
one end of the switch is connected to the first end of the switch detection circuit and the second input end of the control module power supply circuit, the other end of the switch is connected to the power supply module, the second end of the switch detection circuit is connected to the first input end of the control module, the first output end of the control module is connected to the third input end of the control module power supply circuit, the second output end of the control module is connected to the second input end of the power output control circuit,
the second end of the switch detection circuit is used for outputting a preset level signal when the switch is turned on; the control module is used for outputting a first driving signal to the control module power supply circuit after detecting a preset level signal and keeping the preset level signal for a first preset time period so that the control module power supply circuit supplies power to the control module, and outputting a second driving signal to the power supply output control circuit so that the power supply output control circuit supplies power to the electric equipment; and/or, in the state that the power output control circuit supplies power to the electric equipment, if the control module detects the preset level signal and the preset level signal is kept for a second preset period of time, outputting a third driving signal to the control module power supply circuit so as to stop the control module power supply circuit from supplying power to the control module, and outputting a fourth driving signal to the power output control circuit so as to stop the power output control circuit from supplying power to the electric equipment.
In an embodiment, the switch detection circuit includes a first resistor, a second resistor, a first capacitor, a first diode, and a second diode, where the first capacitor is connected in parallel to two ends of the first diode, the first resistor is connected in parallel to two ends of the first capacitor, an anode terminal of the first diode is connected to a ground terminal, a cathode terminal of the first diode is connected to one end of the second resistor, a cathode terminal of the first diode is used as a second terminal of the switch detection circuit, and another end of the second resistor is used as a first terminal of the switch detection circuit.
In an embodiment, the control module power supply circuit includes a voltage division module, a first switching tube, a second switching tube, a third diode, a fourth diode, a fifth diode, an eighth resistor, a ninth resistor and a tenth resistor, one end of the voltage division module is used as a second input end of the control module power supply circuit, the other end of the voltage division module is connected to a positive end of the third diode, a negative end of the third diode and a negative end of the fourth diode are commonly connected and commonly connected to a control end of the first switching tube, a first end of the first switching tube is connected to a ground end, a second end of the first switching tube is connected to one end of the tenth resistor, the other end of the tenth resistor is connected to a control end of the second switching tube, a first end of the second switching tube is connected to a negative end of the fifth diode, a positive end of the fifth diode is used as a first input end of the control module power supply circuit, a second end of the second switching tube is used as an output end of the control module power supply circuit, and the ninth resistor is connected in parallel to the control end and the first end of the first switching tube.
In an embodiment, the control module power supply circuit further includes a fourteenth resistor, one end of the fourteenth resistor is connected to the first end of the second switching tube and the negative end of the fifth diode, and the other end of the fourteenth resistor is used as the third input end of the control module power supply circuit.
In an embodiment, the voltage dividing module includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first voltage stabilizing tube, a second voltage stabilizing tube and a second capacitor, wherein one ends of the third resistor and the fourth resistor are commonly connected to one end of the voltage dividing module, the negative ends of the first voltage stabilizing tube and the second voltage stabilizing tube are commonly connected to the other end of the fourth resistor, one ends of the fifth resistor and the sixth resistor are commonly connected to the other end of the voltage dividing module, the other end of the fifth resistor is connected to the positive end of the second voltage stabilizing tube, the positive end of the first voltage stabilizing tube, the other ends of the third resistor and the sixth resistor are all connected to the ground, and the second capacitor is connected to the two ends of the fifth resistor in parallel.
In an embodiment, the on-off control circuit further includes a sixth diode, a cathode terminal of the sixth diode is connected to one terminal of the voltage dividing module, and an anode terminal of the sixth diode is used as the test port.
In an embodiment, the control module power supply circuit further includes a voltage stabilizing network, a first end of the voltage stabilizing network is connected to the control end of the second switching tube, and a second end of the voltage stabilizing network is connected to the first end of the second switching tube.
In an embodiment, the voltage stabilizing network includes a seventh resistor, a third voltage stabilizing tube and a third capacitor, wherein the positive terminal of the third voltage stabilizing tube is used as the first terminal of the voltage stabilizing network, the negative terminal of the third voltage stabilizing tube is used as the second terminal of the voltage stabilizing network, and the seventh resistor and the third capacitor are connected in parallel with two ends of the third voltage stabilizing tube.
In an embodiment, the power output control circuit includes a third switch tube, a fourth switch tube, an eleventh resistor, a twelfth resistor and a thirteenth resistor, wherein one end of the eleventh resistor and one end of the twelfth resistor are connected to the control end of the third switch tube, the other end of the eleventh resistor is used as the second input end of the power output control circuit, the other end of the twelfth resistor and the first end of the third switch tube are connected to the ground end, the second end of the third switch tube is connected to one end of the thirteenth resistor, the other end of the thirteenth resistor is connected to the control end of the fourth switch tube, the first end of the fourth switch tube is connected to the other end of the switch, and the second end of the fourth switch tube is used as the output end of the power output control circuit.
A control system comprises electric equipment and an on-off control circuit, wherein the on-off control circuit is electrically connected with the electric equipment.
The present application proposes a power-on/off control circuit and control system, the power-on/off control circuit is configured with a switch detection circuit for detecting whether a switch is pressed, a control module power supply circuit for controlling power supply to a control module, and a power output control circuit for finally controlling power supply to electric equipment, the switch detection circuit 12 is configured to detect a state of the switch, and when the switch is turned on, the switch detection circuit is configured to output a preset level signal through a second end of the switch detection circuit 12, and the preset level signal may be a high level signal, and hereinafter, description will be given by taking, as an example, a high level output from the second end of the switch detection circuit when all switches are turned on. Therefore, when the switch is in false touch, because the time of false touch is generally shorter (less than the first preset time length), that is, the conduction time of the switch is shorter, although the switch is pressed in a certain time, the second end of the switch detection circuit outputs a high-level signal, but the time for outputting the high-level signal is not long enough, the control module cannot output the first driving signal to the control module power supply circuit, so that the control module power supply circuit cannot provide power for the control module, and cannot or cannot output the second driving signal to drive the power supply to output the control circuit to supply power to the electric equipment, that is, even if the electric equipment is in a power-off state under the condition of false touch, the power-on/power-off control circuit provided by the application can effectively prevent the condition that the power is turned on due to the false touch.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a control system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of the connection of a switch, a switch detection circuit and a control module power supply circuit provided in one embodiment of the present application;
FIG. 3 is a schematic diagram of a power output control circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of an overall structure of a power on/off control circuit according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In order to illustrate the technical solution of the present application, the following description is made by specific examples.
Referring to fig. 1, the control system provided by the present application includes a power on/off control circuit 1 and an electric device 2, where the power on/off control circuit 1 includes a switch 11, a switch detection circuit 12, a power module 13, and a power module 13 connected to a first input end of a control module power supply circuit 15 and a first input end of a power output control circuit 16, an output end of the power output control circuit 16 is connected to the electric device 2, and an output end of the control module power supply circuit 15 is connected to a power supply end of the control module 14.
One end of the switch 11 is connected to a first end of the switch detection circuit 12 and a second input end of the control module power supply circuit 15, the other end of the switch 11 is connected to the power supply module 13, a second end of the switch detection circuit 12 is connected to a first input end of the control module 14, a first output end of the control module 14 is connected to a third input end of the control module power supply circuit 15, and a second output end of the control module 14 is connected to a second input end of the power supply output control circuit 16;
wherein, the second end of the switch detection circuit 12 is used for outputting a preset level signal when the switch is turned on; the control module 14 is configured to output a first driving signal to the control module power supply circuit 15 after detecting the preset level signal and the preset level signal is maintained for a first preset period of time, so that the control module power supply circuit 15 supplies power to the control module 14, and output a second driving signal to the power output control circuit 16, so that the power output control circuit 16 supplies power to the electric device; and/or, in a state that the power output control circuit 16 supplies power to the electric equipment 2, if the control module 14 detects the preset level signal and the preset level signal is kept for the second preset period of time, outputting a third driving signal to the control module power supply circuit 15 to stop the control module power supply circuit 15 from supplying power to the control module 14, and outputting a fourth driving signal to the power output control circuit 15 to stop the power output control circuit 15 from supplying power to the electric equipment 2.
Here, describing the working principle of the switch of the on-off control circuit 1, when the switch 11 is not pressed, the power supply module 13 and the control module 14 are in a power-off state, the power supply module 13 cannot supply power to the control module 14, the control module 14 cannot work, the control module 14 cannot output a driving signal, so that the power supply output control circuit 15 provides power for the control module 14, and cannot output a driving signal to the driving power supply output control circuit 16, so that the power supply output control circuit 16 cannot supply power to the electric equipment 2, and at this time, the electric equipment 2 is in a power-off state.
The switch detection circuit 12 is configured to detect a state of the switch, and when the switch 11 is turned on, the switch detection circuit 12 is configured to output a preset level signal through the second terminal of the switch detection circuit 12, which may be a high level signal, for example, hereinafter, a description will be given of an example in which the second terminal of the switch detection circuit 12 outputs a high level when the switch 11 is turned on. Therefore, when there is a false touch on the switch 11, since the time of the false touch is generally shorter (less than the first preset time period), that is, the on time of the switch 11 is shorter, although the switch 11 is pressed in a certain time period, the second end of the switch detection circuit 12 will output a high level signal, but the time period of outputting the high level signal is not long enough, the control module 14 will not output the first driving signal to the control module power supply circuit 15, so that the control module power supply circuit 15 will not provide power for the control module, and will not or cannot output the second driving signal to drive the power supply output control circuit 16 to supply power to the electric equipment 2, that is, even if the false touch is performed, the electric equipment 2 will still be in the off state, so that the power on/off control circuit provided by the application can effectively prevent the situation that the false touch leads to the power on.
When the power-on is needed, the switch 11 is purposefully pressed continuously, and the switch 11 is pressed continuously for a first preset time period, that is, when the on time period of the switch 11 exceeds the first preset time period, the normal power-on action is described, and because the time period is long enough, the power module 13 can provide a required driving signal for the control module power supply circuit 15 through the switch 11, so that the control module power supply circuit 15 supplies power for the control module 14, the control module 14 can work normally, the control module 14 can output a first driving signal (such as a high level), the driving control module power supply circuit 15 continuously supplies power for the control module 14, and the control module 14 can output a second driving signal (such as a high level), so that the driving power supply output control circuit 16 works, and the power module 13 continuously supplies power for the electric equipment through the power output control circuit 16, so that the power equipment 2 realizes the power-on function according to the prescribed time period.
When the switch 11 is pressed down again, because the switch 11 is pressed down and is continuously pressed down for more than a second preset time period, that is, when the power output control circuit 16 supplies power to the electric equipment 2, the on time period of the switch 11 exceeds the second preset time period, the control module 14 also detects a preset level signal output by the second end of the switch detection circuit 12 and the preset level signal keeps the second preset time period, and at the moment, the control module 14 outputs a fourth driving signal (such as a low level) to the power output control circuit 16, so that the power output control circuit 16 stops supplying power to the electric equipment, thereby realizing the shutdown operation, and outputs a third driving signal (such as a low level) to the control module power supply circuit 15, so that the control module power supply circuit 15 stops supplying power to the control module 14. Subsequently, when the switch is released, the control module 14 will stop working because the power module 13 cannot supply power to the control module 14 through the switch 11, and finally the shutdown function is realized.
The first preset duration and the second preset duration may be flexibly configured, for example, the first preset duration and/or the second preset duration may be 3 seconds, 5 seconds, 6 seconds, etc., and the application is not limited, and the on-off time may be flexibly configured by configuring the first preset duration and the second preset duration.
In addition, the control module may specifically be a microcontroller such as a single chip microcomputer (Microcontroller Unit, MCU), and the like, and is not specifically limited, and the control module may output the first, second, third, and fourth driving signals through its own related control pins, so as to drive the control module power supply circuit 15 and the power output control circuit 16.
In addition, in other embodiments, the method may further include: the long-time press is needed for startup, the short-time press is needed for shutdown/the short-time press is needed for startup, the long-time press is needed for shutdown/the long-time press is needed for startup and shutdown, the configuration can be carried out through the first preset time length and the second preset time length, and the configuration is not limited in the text.
According to the switching on/off control circuit, on the one hand, the situation that switching on/off is unstable due to the fact that switching on/off is touched by mistake can be effectively prevented, on-off stability can be improved, on the other hand, switching on/off time can be flexibly set, switching on/off is more flexible, and the switching on/off control circuit is stronger and more flexible in application scene.
Referring to fig. 2, IN one embodiment, a switch detection circuit 12 is provided, where the switch detection circuit 12 includes a first resistor R1, a second resistor R2, a first capacitor C1, a first diode D1, and a first capacitor C1 connected IN parallel to two ends of the first diode D1, the first resistor R1 is connected IN parallel to two ends of the first diode D1, the positive terminal of the first diode D1 is connected to the ground, the negative terminal of the first diode D1 is connected to one end of the second resistor R2, the negative terminal of the first diode D1 is used as the second terminal of the switch detection circuit 12, that is, the common connection terminals of the first resistor R1, the second resistor R2, the first capacitor C1 and the first diode D1 are used as the second terminal (key_in_det) of the switch detection circuit 12, the other common connection terminal is connected to the ground, and the other end of the second resistor R2 is used as the first end of the switch detection circuit is connected to the first end of the switch_WAKE_Y_Y_DET (PW_PY) of the switch module is connected to the other end of the switch detection circuit 14.
In this embodiment, whether the switch 11 is turned on or not can be determined by the control module 14 by detecting the level signal of the negative terminal of the first diode D1 (i.e. the second terminal of the switch detection circuit 12), as shown in fig. 2, according to the circuit relationship, it can be seen that when the negative terminal of the first diode D1 is detected to be at a high level, it indicates that the switch 11 is pressed, the switch 11 is in a conductive state, and when the negative terminal of the first diode D1 is detected to be at a low level, it indicates that the switch 11 is not pressed, and the switch 11 is in an off state.
In addition, in an embodiment, the switch detection circuit 12 further includes a second diode D2, the negative terminal of the second diode D2 is connected to the overvoltage protection circuit port (char_3v3), the positive terminal of the second diode D2 is connected to the negative terminal of the first diode, that is, the positive terminal of the second diode D2 is commonly connected to the first resistor R1, the second resistor R2, the first capacitor C1 and one terminal of the first diode D1, wherein the overvoltage protection circuit is not shown in the present application. By being connected to the overvoltage protection circuit, the voltage at the negative terminal of the first diode D1 is prevented from being embedded in a certain range, and the influence on the control module 12 is avoided.
In an embodiment, the switch detection circuit further includes a sixth diode D6, a negative terminal of the sixth diode D6 is connected to a common terminal of the fifth resistor R5 and the sixth resistor R6, and a positive terminal of the sixth diode D6 is connected to a common terminal of the second resistor R2 and the third resistor R3, so as to lead out a detection port (wake_en) as the test port. The test port can be used for testing whether the test circuit can work normally or not, specifically, a certain voltage is applied to the test port, so that whether the shutdown circuit can work normally or not is judged.
In an embodiment, a control module power supply circuit 15 is provided, where the control module power supply circuit 15 includes a voltage dividing module 151, a first switch Q1, a second switch Q2, a third diode D3, a fourth diode D4, a fifth diode D5, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10, where one end of the voltage dividing module 151 is used as a second input terminal of the control module power supply circuit 15 and connected to one end (wake_key) of the switch 11, the other end of the voltage dividing module 151 is connected to an anode terminal of the third diode D3, a cathode terminal of the third diode D3 is commonly connected to a cathode terminal of the fourth diode D4 and a common connection terminal is connected to a control terminal of the first switch Q1, a first terminal of the first switch Q1 is connected to a ground terminal, a second terminal of the first switch Q1 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to a control terminal of the second switch Q2, the other end of the voltage dividing module 151 is connected to an anode terminal of the third diode D3, a cathode terminal of the third diode D3 is connected to a cathode terminal of the control module power supply circuit (VCC 2 is connected to the anode terminal of the control module D13) of the fifth diode D4, and the anode terminal of the fifth diode D is connected to the control terminal of the control module power supply circuit (VCC 2 is connected to the anode terminal of the control module). In an embodiment, the control module power supply circuit 15 further includes a ninth resistor R9, and the ninth resistor R9 is connected in parallel between the control terminal and the first terminal of the first switching tube Q1.
Specifically, as shown in fig. 2, the voltage dividing module 151 is mainly configured to divide the voltage of the power supply provided by the power supply module to obtain a driving level suitable for driving the first switching tube Q1, where the voltage dividing module 151 may have multiple implementation manners according to requirements, in this application, an implementation manner is provided, the voltage dividing module 151 specifically includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first voltage stabilizing tube ZD1, a second voltage stabilizing tube ZD2 and a second capacitor C2, one ends of the third resistor R3 and the fourth resistor R4 are commonly connected as one end of the voltage dividing module 151, that is, one ends of the third resistor R3 and the fourth resistor R4 are commonly connected as a second input end of the control module power supply circuit 15, and are used for being connected to one end (wake_key) of the switch 11, the negative ends of the first voltage stabilizing tube ZD1 and the second voltage stabilizing tube ZD2 are commonly connected to the other end of the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 and the second capacitor C2 are commonly connected as one end of the voltage stabilizing module, that the positive end and the other end of the second resistor R2 and the second end of the second resistor R2 are commonly connected to the positive end of the third resistor R2 and the second resistor R2 and the other end of the second resistor 2 are commonly connected to the other end of the fourth resistor R2, and the second end of the fourth resistor R2 is commonly connected to the other end of the fourth resistor 2, and the fourth resistor 2 is commonly connected to the other end of the negative end of the fourth resistor 2, and the fourth resistor 2 is commonly connected to the negative end of the fourth resistor 2.
In an embodiment, the control module power supply circuit 15 further comprises a fourteenth resistor R14, wherein one end of the fourteenth resistor R14 is connected to the first end of the second switching tube Q2 and the negative end of the fifth diode D2, and the other end of the fourteenth resistor R14 is connected to the other end (pre_pw) of the switch.
In combination with the above embodiment, as shown in fig. 3, in an embodiment, the control module power supply circuit 15 may further include a voltage stabilizing network 154, where a first end of the voltage stabilizing network 154 is connected to the control end of the second switching tube Q2, and a second end of the voltage stabilizing network 154 is connected to the first end of the second switching tube Q2. The voltage stabilizing network 154 mainly has functions of overvoltage protection between the control end and the first end of the second switching tube Q2, and has a filtering function. As shown in the schematic diagram of the voltage stabilizing network in fig. 3, the present application provides a voltage stabilizing network form, where the voltage stabilizing network 154 includes a seventh resistor R7, a third voltage stabilizing tube ZD3 and a third capacitor C3, where the positive terminal of the third voltage stabilizing tube ZD3 is used as the first terminal of the voltage stabilizing network 154, connected to the control terminal of the second switching tube Q2, the negative terminal of the third voltage stabilizing tube ZD3 is used as the second terminal of the voltage stabilizing network 154, connected to the first terminal of the second switching tube Q2, the seventh resistor R7 and the third capacitor C3, and connected to two ends of the third voltage stabilizing tube ZD 3. In this embodiment, the third voltage stabilizing tube ZD3 is connected in parallel with the seventh resistor R7 and the third capacitor C3, so as to absorb the surge current generated by the circuit at the moment of power on, effectively avoid the second switching tube Q2 from being damaged by the stronger surge current, and play a role in protecting the switching tube.
In an embodiment, as shown in fig. 2, the first switching tube Q1 may be an NPN-type transistor, and the second switching tube Q2 may be a P-type MOS transistor, however, in some embodiments, other switching tube combinations may be adopted according to the circuit function, which is not limited in this application and will not be described in detail.
As shown in fig. 4, the present application provides a power output control circuit, where the power output control circuit 16 includes a third switch tube Q3, a fourth switch tube Q4, an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13, where one end of the eleventh resistor R11 and the twelfth resistor R12 are connected to the control end of the third switch tube Q3, the other end of the eleventh resistor R11 is used as the second input end of the power output control circuit 16, the second output end (mcu_io2) connected to the control module 14 is used, the other end of the twelfth resistor R12 and the first end of the third switch tube Q3 are connected to the ground end, the second end of the third switch tube Q3 is connected to one end of the thirteenth resistor R13, the other end of the thirteenth resistor R13 is connected to the control end of the fourth switch tube Q4, the first end of the fourth switch tube Q4 is connected to the other end (pre_pw) of the switch, and the second end of the fourth switch tube Q4 is used as the output end of the power output control circuit 16 connected to the consumer (VOUT 2).
In an embodiment, similar to the control module power supply circuit, in order to protect the fourth switching tube Q4, a voltage stabilizing network 166 is further disposed between the control end and the first end of the fourth switching tube Q4, where a specific implementation of the voltage stabilizing network 166 may be similar to the voltage stabilizing network 154, and detailed description thereof will not be repeated here.
In addition, as shown in fig. 4, the third switching tube Q3 may be an NPN type transistor, and the fourth switching tube Q4 may be a P type MOS tube, however, in some embodiments, other switching tube combinations may be adopted according to the circuit function, which is not limited in this application and is not described in detail.
The above description is made on each module circuit of the on-off control circuit provided by the application, and in the following, with reference to fig. 1 to 4, taking the control module as an MCU as an example, the working principle of the on-off control circuit is summarized and described:
it can be seen that the on-off control circuit provided in the present application mainly includes 3 parts, namely, a switch detection circuit 12, an MCU power supply circuit 15, and a power output control circuit 16, where the switch detection circuit 12 is configured to detect whether the switch 11 is turned on, and is also configured to detect whether the switch 11 meets a requirement for a specified time to perform a next action, for example, to detect that the switch 11 is continuously pressed for more than 3 seconds to perform an on-off operation, and otherwise, not perform a corresponding action. The MCU power supply circuit 15 supplies power to the MCU in the key pressing process, and ensures that the MCU works normally to perform key detection operation. The power output control circuit executes the output or closing operation of the power supply under the condition that the key is pressed for a prescribed time, thereby realizing the switching-on and switching-off function of the electric equipment.
When the circuit is electrified and the switch 11 is not pressed, the MOS transistor Q1, the triode Q2, the triode Q3 and the MOS transistor Q4 are cut off, and the VCC_MCU end has no power supply output. When the switch 11 is pressed down, the power supply VCC is divided by the fourteenth resistor R14, the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor 6 to make the triode Q1 saturated and conductive, and the current flows to the V of the MOS tube Q2 as shown by black arrows a, b and c gs The MOS tube Q2 is conducted by voltage drop, so that a power supply output is arranged at the VCC_MCU end, the VCC_MCU power supply supplies power to the MCU through a rear stage, and when the voltage drop is realized, the VCC_MCU power supply can supply power to the MCU after voltage drop through the voltage stabilizing chip, so that the MCU can normally work to execute key detection and output driving locking signal operation, and the power supply can adjust resistance parameters according to requirements to meet requirements, so that the requirements are not described in detail herein.
After the MCU works normally, the IO port of the MCU detects high and low levels of the KEY_IN_DET signal, when the high level is detected to indicate that the switch 11 is pressed, the KEY_IN_DET signal is detected according to the on-off time requirement, if the high level is continuously detected IN the specified time, the IO port of the MCU locks the output high levels of the MCU_IO1 and MCU_IO2 signals, and when the MCU_IO1 signal is IN the high level, the triode Q1 is saturated and conducted, so that the MOS tube Q2 is conducted, and as shown by a bold black arrow c, the fact that the VCC_MCU end has a stable power supply to output the MCU is effectively ensured. When the MCU_IO2 signal is at high level, the transistor Q3 is saturated and conducted, the current flows to the ground through the transistor Q3, and the current flows to the ground as shown by a thick black arrow d, so that the V of the MOS transistor Q4 gs Creating a pressure drop to causeMOS pipe Q4 switches on, as shown by thick black arrow e to guarantee that VOUT has regulated power supply to export and supply power for the consumer, realize carrying out the start function according to the stipulated time.
When the power-off is needed, the switch 11 is pressed down, when the IO port of the MCU detects that the KEY_IN_DET signal is continuously high IN a specified time, the IO port of the MCU can lock the output low level of the MCU_IO1 and MCU_IO2 signals, when the MCU_IO2 signal is low, the triode Q3 is cut off, so that the MOS tube Q4 is cut off, VOUT does not have power output, the electric equipment cannot work, thereby realizing the power-off operation, when the switch is loosened, the rough black arrow a does not flow, the triode Q1 is cut off, so that the MOS tube Q2 is cut off, the VCC_MCU does not have power output, and the MCU is powered off to stop working, thereby realizing the power-off function.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. The on-off control circuit is used for being connected to electric equipment and is characterized by comprising an on-off detection circuit, a switch, a power supply module, a control module power supply circuit and a power supply output control circuit;
the power supply module is connected to a first input end of the control module power supply circuit and a first input end of the power supply output control circuit, an output end of the power supply output control circuit is connected to the electric equipment, and an output end of the control module power supply circuit is connected to the control module;
one end of the switch is connected to the first end of the switch detection circuit and the second input end of the control module power supply circuit, the other end of the switch is connected to the power supply module, the second end of the switch detection circuit is connected to the first input end of the control module, the first output end of the control module is connected to the third input end of the control module power supply circuit, the second output end of the control module is connected to the second input end of the power output control circuit,
the second end of the switch detection circuit is used for outputting a preset level signal when the switch is turned on; the control module is used for outputting a first driving signal to the control module power supply circuit after detecting the preset level signal and keeping the preset level signal for a first preset time period so that the control module power supply circuit supplies power to the control module, and outputting a second driving signal to the power supply output control circuit so that the power supply output control circuit supplies power to the electric equipment; and/or, in the state that the power output control circuit supplies power to the electric equipment, if the control module detects the preset level signal and the preset level signal is kept for a second preset time period, outputting a third driving signal to the control module power supply circuit so that the control module power supply circuit stops supplying power to the control module, and outputting a fourth driving signal to the power output control circuit so that the power output control circuit stops supplying power to the electric equipment.
2. The on-off control circuit according to claim 1, wherein the on-off detection circuit includes a first resistor, a second resistor, a first capacitor, a first diode, and a second diode, the first capacitor is connected in parallel to two ends of the first diode, the first resistor is connected in parallel to two ends of the first capacitor, an anode terminal of the first diode is connected to a ground terminal, a cathode terminal of the first diode is connected to one terminal of the second resistor, a cathode terminal of the first diode is used as a second terminal of the on-off detection circuit, and another terminal of the second resistor is used as a first terminal of the on-off detection circuit.
3. The power on/off control circuit according to claim 1, wherein the control module power supply circuit includes a voltage dividing module, a first switching tube, a second switching tube, a third diode, a fourth diode, a fifth diode, an eighth resistor, a ninth resistor, and a tenth resistor, one end of the voltage dividing module is used as a second input end of the control module power supply circuit, the other end of the voltage dividing module is connected to a positive end of the third diode, a negative end of the third diode is commonly connected with a negative end of the fourth diode and a common connection end is connected to a control end of the first switching tube, a first end of the first switching tube is connected to a ground end, a second end of the first switching tube is connected to one end of the tenth resistor, the other end of the tenth resistor is connected to a control end of the second switching tube, a first end of the second switching tube is connected to a negative end of the fifth diode, a positive end of the fifth diode is used as a control end of the control module power supply circuit, a first end of the second switching tube is connected to a first end of the control module power supply circuit, and a second end of the switching tube is connected to the first end of the control circuit.
4. The on-off control circuit of claim 3, wherein the control module power supply circuit further comprises a fourteenth resistor, one end of the fourteenth resistor being connected to the first end of the second switching tube and the negative end of the fifth diode, and the other end of the fourteenth resistor being connected to the other end of the switch.
5. The power on/off control circuit according to claim 3, wherein the voltage dividing module comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first voltage stabilizing tube, a second voltage stabilizing tube and a second capacitor, one ends of the third resistor and the fourth resistor are commonly connected to one end of the voltage dividing module, the negative ends of the first voltage stabilizing tube and the second voltage stabilizing tube are commonly connected to the other end of the fourth resistor, one ends of the fifth resistor and the sixth resistor are commonly connected to the other end of the voltage dividing module, the other end of the fifth resistor is connected to the positive end of the second voltage stabilizing tube, the positive end of the first voltage stabilizing tube, the other ends of the third resistor and the sixth resistor are both connected to a ground end, and the second capacitor is connected to the two ends of the sixth resistor in parallel.
6. The on-off control circuit of claim 3, further comprising a sixth diode having a negative terminal connected to one terminal of the voltage divider module and a positive terminal as a test port.
7. The power on/off control circuit of claim 3, wherein the control module power supply circuit further comprises a voltage stabilizing network, a first end of the voltage stabilizing network being connected to the control end of the second switching tube, and a second end of the voltage stabilizing network being connected to the first end of the second switching tube.
8. The on-off control circuit of claim 7, wherein the voltage stabilizing network comprises a seventh resistor, a third voltage stabilizing tube and a third capacitor, wherein a positive terminal of the third voltage stabilizing tube is used as a first terminal of the voltage stabilizing network, a negative terminal of the third voltage stabilizing tube is used as a second terminal of the voltage stabilizing network, and the seventh resistor and the third capacitor are connected in parallel with two ends of the third voltage stabilizing tube.
9. The power on/off control circuit according to any one of claims 1 to 7, wherein the power supply output control circuit includes a third switching tube, a fourth switching tube, an eleventh resistor, a twelfth resistor, and a thirteenth resistor, wherein one end of the eleventh resistor and one end of the twelfth resistor are connected to a control terminal of the third switching tube, the other end of the eleventh resistor is used as a second input terminal of the power supply output control circuit, the other end of the twelfth resistor and a first end of the third switching tube are connected to a ground terminal, the second end of the third switching tube is connected to one end of the thirteenth resistor, the other end of the thirteenth resistor is connected to a control terminal of the fourth switching tube, the first end of the fourth switching tube is connected to the other end of the switch, and the second end of the fourth switching tube is used as an output terminal of the power supply output control circuit.
10. A control system comprising a powered device and a power-on/off control circuit as claimed in any one of claims 1 to 9, the power-on/off control circuit being electrically connected to the powered device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121908790.5U CN219041760U (en) | 2021-08-13 | 2021-08-13 | Startup and shutdown control circuit and control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121908790.5U CN219041760U (en) | 2021-08-13 | 2021-08-13 | Startup and shutdown control circuit and control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219041760U true CN219041760U (en) | 2023-05-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121908790.5U Active CN219041760U (en) | 2021-08-13 | 2021-08-13 | Startup and shutdown control circuit and control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219041760U (en) |
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2021
- 2021-08-13 CN CN202121908790.5U patent/CN219041760U/en active Active
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