CN217588054U - Power-on starting detection circuit and electronic equipment - Google Patents
Power-on starting detection circuit and electronic equipment Download PDFInfo
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- CN217588054U CN217588054U CN202220826297.7U CN202220826297U CN217588054U CN 217588054 U CN217588054 U CN 217588054U CN 202220826297 U CN202220826297 U CN 202220826297U CN 217588054 U CN217588054 U CN 217588054U
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Abstract
The application relates to a power-on starting-up detection circuit and electronic equipment. The power-on starting-up detection circuit comprises a power-on input end, a charge-discharge circuit, a voltage maintaining circuit and a signal output end; the charging and discharging circuit is connected with the electrifying input end; the voltage maintaining circuit is connected with the charging and discharging circuit; the signal output end is connected with the charge and discharge circuit. The performance of the driving circuit is greatly improved by introducing the voltage maintaining circuit, so that the effectiveness and consistency of the discharging function of the charging and discharging circuit are improved.
Description
Technical Field
The application relates to the technical field of starting control, in particular to a power-on starting detection circuit and electronic equipment.
Background
Electronic equipment products such as a mobile phone, a vehicle stand and a relay station sometimes cause shutdown of a host machine due to power loosening or power failure. At this time, the restart is often required by switching a mechanical key. In order to improve user experience and enable automatic startup to be realized after power supply recovery, most of the existing electronic equipment products are additionally provided with a power-on startup detection circuit.
The technical scheme of the power-on startup detection circuit is that a capacitor is connected in series with a power-on enabling path, the main switch of a power supply is kept conducted within the time of charging the capacitor by utilizing the charging characteristic of the capacitor, then the main switch is controlled to be continuously conducted after a system works, and the current of the full-current path of the capacitor is reduced to zero, so that the enabling function is lost.
One important problem to be solved by the above solution is: because the capacitor is fully charged after power-on, if the capacitor cannot be quickly discharged before next power-on after the input power supply is powered off for a short time, the power-on automatic starting function can be influenced. Therefore, it is necessary to realize a rapid discharge in the power-on start-up detection circuit.
The prior art scheme of the power-on startup detection circuit is simple in circuit, but the leakage current of the host is large, and the resistance of a capacitor discharge loop is large and the discharge is slow; or the capacitor discharges fast, but the circuit is complicated, the starting time of capacitor fast discharge is influenced by the brand, model and temperature characteristic of the component, and the material replacement is inconvenient.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems in the prior art, the present application provides a power-on detection circuit and an electronic device, so as to simplify the circuit, improve the performance consistency and reduce the later maintenance cost on the basis of ensuring the rapid discharge.
A power-on detection circuit, comprising:
a power-on input end;
the charging and discharging circuit is connected with the power-on input end;
the voltage maintaining circuit is connected with the charging and discharging circuit;
the signal output end is connected with the charge and discharge circuit;
when the power-on input end is powered on, the charging and discharging circuit and the voltage maintaining circuit are charged based on the voltage of the power-on input end, and a detection signal is output by using the signal output end; when the power-on input end is powered off, the charging and discharging circuit discharges based on the voltage of the power-on input end and the voltage maintained by the voltage maintaining circuit.
The charge and discharge circuit comprises:
a first end of the first capacitor is connected with the power-on input end and the voltage maintaining circuit, and a second end of the first capacitor is connected with the signal output end;
and the first path end of the switch unit is connected with the first end of the first capacitor, the second path end of the switch unit is connected with the second end of the first capacitor, and the control end of the switch unit is connected with the power-on input end.
The switching unit is a transistor.
The charging and discharging circuit further comprises a first resistor;
the first end of the first resistor is connected with the second path end of the switch unit, and the second end of the first resistor is connected with the second end of the first capacitor.
The charge and discharge circuit further includes:
a first diode, wherein the anode of the first diode is connected with the power-on input end, and the cathode of the first diode is connected with the first end of the first capacitor and the voltage maintaining circuit;
and the anode of the second diode is grounded, and the cathode of the second diode is connected with the second end of the first capacitor.
The voltage maintenance circuit includes:
and a first end of the second capacitor is connected with the cathode of the first diode, and a second end of the second capacitor is grounded.
The charging and discharging circuit further comprises a second resistor;
and the first end of the second resistor is connected with the second end of the first capacitor, and the second end of the second resistor is grounded.
An electronic device comprises the power-on and power-on detection circuit.
The electronic equipment also comprises a digital signal processor and a switch;
the digital signal processor is connected with the power-on startup detection circuit and the switch and is used for controlling the switch to be kept on when receiving a detection signal output by a signal output end of the power-on startup detection circuit so as to realize power-on startup.
An electronic device further includes a host power supply;
the host power supply is connected with the power-on input end of the power-on start-up detection circuit and used for supplying power to the power-on start-up detection circuit so as to power on the power-on input end of the power-on start-up detection circuit.
Compared with the prior art, the application has at least the following beneficial effects:
1. the power-on detection circuit scheme on the hand platform and the trolley platform is unified, and the circuit cost is reduced. Because the discharge speed requirements of the hand platform and the vehicle platform on the discharge circuit are different, the rapid discharge circuit schemes in the power-on starting detection circuits of the hand platform and the vehicle platform in the prior art are different. The technical scheme of the application is simple and reliable in circuit on the basis of ensuring the discharging speed, so that the technical scheme can replace the existing technical scheme and can be applied to a hand table and a vehicle table at the same time.
2. The problem of poor performance consistency of the original power-on startup detection circuit scheme of the mobile phone is solved. The original scheme of the power-on automatic start-up detection circuit of the mobile phone is complex in structure, and the starting time of the capacitor quick release is influenced by the brand, model or temperature characteristics of the diode and the MOS tube.
3. The problem of the original power on start detection circuit scheme material of cell-phone replace inconvenient is solved, the cost of later maintenance is reduced. The original power-on startup detection circuit of the mobile phone has a complex structure, all components have errors, and the mobile phone needs to be debugged again after being replaced.
4. The problems of large resistance and slow discharge of a capacitor discharge loop in the original power-on startup detection circuit scheme of the vehicle platform are solved, and the success rate of the power-on startup of the main machine is improved. In the original scheme of the power-on start-up detection circuit of the vehicle platform, a capacitor discharge loop has a resistor with larger resistance value, so that the capacitor discharges slowly.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural component diagram of an electronic device provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a power-on and power-on detection circuit of the electronic device in fig. 1.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise. In the embodiment of the present application, all the directional indicators (such as upper, lower, left, right, front, and rear … …) are used only to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1 and fig. 2, an electronic device 100 is provided according to an embodiment of the present disclosure. The electronic device 100 is any one of electronic devices that can implement a power-on auto-on function. Specifically, the electronic device 100 may be a mobile station, a vehicle station, a relay station, a mobile phone, a tablet computer, a computer, or the like.
The present embodiment provides an electronic device 100 including, but not limited to, a power-on detection circuit 120. When the electronic device 100 is used, a power supply may be loose or a power failure may cause a shutdown of the host, and the power-on/power-on detection circuit 120 may implement an automatic power-on of the host when the power supply is restored.
The electronic device 100 further includes a digital signal processor 130 and a switch 140. The digital signal processor 130 is connected to the power-on detection circuit 120 and the switch 140. The digital signal processor 130 is configured to control the switch 140 to remain on when receiving the detection signal output by the signal output terminal 124 of the power-on detection circuit 120, so as to implement power-on.
Specifically, when the power-on input terminal 121 of the power-on detection circuit 120 is powered on, the signal output terminal 124 of the power-on detection circuit 120 outputs a detection signal. The dsp 130 receives the detection signal, and keeps the switch 140 turned on through the I/O terminal of the dsp 130, so as to power on and power on.
The electronic device 100 also includes a host power supply 110. The host power supply 110 is connected to a power-on input 121 of the power-on detection circuit 120. The host power supply 110 is used to supply power to the power-on detection circuit 120, so that the power-on input terminal 121 of the power-on detection circuit 120 is powered on.
Specifically, the host power supply 110 outputs a system electrical signal to the power-on/off detection circuit 120 and the digital signal processor 130 after the host power switch is turned on. The power-on/power-on detection circuit 120 starts charging after receiving the electrical signal, and outputs a detected signal to the digital signal processor 130. When the dsp 130 receives the electrical signal and then operates, it receives the detection signal from the power-on/power-on detection circuit 120, so that the dsp 130 maintains the switch 140 to be turned on through the I/O terminal. The switch 140 is turned on to turn on the host. It can be understood that the switch 140 is turned on, and then the main board is powered on to supply power to other functional modules, thereby implementing the startup. When the host power supply 110 is powered down, the power-on and power-on detection circuit 120 quickly discharges while the host is powered off. Thus, when the host power supply 110 recovers to supply power and outputs an electrical signal externally, the automatic startup can be realized by repeating the above process.
Specifically, the power-on startup detection circuit 120 can be applied to various electronic devices, industrial monitoring, data monitoring, smart home and other fields.
Referring to fig. 1 and fig. 2, the power-on/power-on detection circuit 120 includes, but is not limited to, a power-on input terminal 121, a voltage maintaining circuit 122, a charging/discharging circuit 123 and a signal output terminal 124. The charge and discharge circuit 123 is connected to the power-on input terminal 121. The voltage maintaining circuit 122 is connected to the charge/discharge circuit 123. The signal output terminal 124 is connected to the charge/discharge circuit 123.
When the power-on input terminal 121 is powered on, the charging and discharging circuit 123 and the voltage maintaining circuit 122 are charged based on the voltage of the power-on input terminal 121, and output the detection signal by using the signal output terminal 124. When the power-on input terminal 121 is powered down, the charging and discharging circuit 123 discharges based on the voltage of the power-on input terminal 121 and the voltage maintained by the voltage maintaining circuit 122.
Specifically, the host power supply 110 provides a voltage to the power-on input terminal 121, and the voltage maintaining circuit 122 and the charging/discharging circuit 123 are charged by the voltage. The charge and discharge circuit 123 outputs a high level signal during the charging process, and the high level signal is output to the digital signal processor 130 through the signal output terminal 124 for power-on. When the host power supply 110 is powered down, the voltage maintaining circuit 122 maintains the fully charged voltage level, and the charging and discharging circuit 123 starts the discharging function under the action of the voltage difference to perform rapid discharging. This voltage difference is formed by the voltage input at the power-up input 121 after power-down and the voltage provided by the voltage maintenance circuit 122 after full charge. After the charge and discharge circuit 123 discharges the power quickly, the automatic start-up can be realized by repeating the above process when the power supply is restored next time.
The charging/discharging circuit 123 includes, but is not limited to, a first capacitor 1231 and a switch unit 1232. The first end of the first capacitor 1231 is connected to the power-on input terminal 121 and the voltage holding circuit 122. A second terminal of the first capacitor 1231 is connected to the signal output terminal 124. A first path terminal of the switching unit 1232 is connected to a first terminal of the first capacitor 1231. A second path terminal of the switching unit 1232 is connected to a second terminal of the first capacitor 1231. The control terminal of the switching unit 1232 is connected to the power-on input terminal 121.
The switching unit 1232 is a transistor, specifically, a pMOS transistor.
The charge and discharge circuit 123 further includes a first resistor 1235.
In the present embodiment, the first end of the first resistor 1235 is connected to the second path end of the switch unit 1232. A second terminal of the first resistor 1235 is connected to a second terminal of the first capacitor 1231.
In some embodiments, a first terminal of the first resistor 1235 may be connected to a first terminal of the first capacitor 1231. A second terminal of the first resistor 1235 may be connected to a first path terminal of the switching unit 1232.
The charge/discharge circuit 123 further includes a first diode 1233 and a second diode 1234. The anode of the first diode 1233 is connected to the power input terminal 121. The cathode of the first diode 1233 is connected to a first terminal of a first capacitor 1231. The anode of the second diode 1234 is connected to ground. The cathode of the second diode 1234 is connected to the second terminal of the first capacitor 1231.
The voltage maintenance circuit 122 includes, but is not limited to, a second capacitor 1221. A first terminal of the second capacitor 1221 is connected to a cathode of the first diode 1233. The second terminal of the second capacitor 1221 is grounded.
The charge and discharge circuit 123 further includes a second resistor 1236.
In this embodiment, the first end of the second resistor 1236 is connected to the second end of the first capacitor 1231. A second terminal of the second resistor 1236 is grounded.
In some embodiments, a first terminal of the second resistor 1236 is connected to a second terminal of the first capacitor 1231. A second terminal of the second resistor 1236 is connected to an anode of the second diode 1234.
It can be understood that, when the power-up input terminal 121 is powered up, the power-up input terminal 121, the first diode 1233, the first capacitor 1231, the second diode 1234, the second resistor 1236 and the ground terminal form a charging loop to charge the first capacitor 1231. Meanwhile, the power-up input terminal 121, the first diode 1233, the second capacitor 1221 and the ground terminal also form a charging loop to charge the second capacitor 1221. The first capacitor 1231 may output a high signal through the signal output terminal 124 during the charging process. The high level signal is detected to realize the automatic start-up of the host. After the first capacitor 1231 is fully charged, the current of the loop is zero, and at this time, the signal output terminal 124 outputs a low level signal, so that the power-on is completed. When the power-down input terminal 121 is powered down, the level of the control terminal of the switching unit 1232 is pulled down, and the second capacitor 1221 maintains the voltage that is fully charged before, that is, the first path terminal of the switching unit 1232 is at a high level. When the pressure difference between the first path end and the control end of the switching unit 1232 reaches the opening threshold of the switching unit 1232, the switching unit 1232 is opened. At this time, the first capacitor 1231, the switching unit 1232, and the first resistor 1235 form a discharge circuit, and the first capacitor 1231 is rapidly discharged. In this way, when the power-on input end 121 is powered on again next time, the switch unit 1232 is turned off, and the automatic power-on of the host computer can be realized by repeating the above processes.
It can be understood that, in the charging loop formed by the power-on input end 121, the first diode 1233, the second capacitor 1221, and the ground end, the first diode 1233 may play a role of limiting the unidirectional flow of current, so as to prevent the current from flowing backward after the power failure of the power-on input end 121, and maintain the voltage of the second capacitor 1221 after being fully charged.
It can be understood that, in the charging loop formed by the power-on input end 121, the first diode 1233, the first capacitor 1231, the second diode 1234, the second resistor 1236, and the ground end, the first diode 1233 and the second diode 1234 may play a role of limiting the unidirectional current flow, so as to prevent the current from flowing backwards after the power-off of the power-on input end 121. Meanwhile, one or both of the forward resistance of the second diode 1234 and the second resistor 1236 are used to output a high level through the signal output terminal 124 during the charging process of the first capacitor 1231. Changing the resistance of the second resistor 1236 also adjusts the time for power-up detection.
It can be understood that, in the discharge circuit formed by the first capacitor 1231, the switching unit 1232 and the first resistor 1235, the first resistor 1235 plays a role of current limiting protection.
In this embodiment, in order not to affect the discharging speed of the first capacitor 1231, the resistance of the first resistor 1235 is not suitable to be large, and may be selected to be 5-15 ohms, and specifically may be 10 ohms.
The power-on automatic start-up detection circuit 120 provided by the application utilizes the first diode 1233 and the second capacitor 1221 to form a driving circuit of the switch unit 1232, and can quickly start the discharge of the first capacitor 1231 when the power failure occurs at the power-on input end 121, so as to achieve the purpose of quickly discharging the first capacitor 1231. The voltage maintaining circuit 122 maintains the voltage maintaining function to keep the switch unit 1232 on all the time, so as to ensure that the first capacitor 1231 is discharged quickly, thereby facilitating the successful startup of the computer after the next power-on.
The scheme of the old power-on automatic start-up detection circuit of the mobile phone is complex in structure, and the starting time of the capacitor quick release is influenced by the brand, model or temperature characteristics of the diode and the MOS tube. And because of the error of components, need debug the circuit again after the components and parts are changed.
The capacitance discharge circuit of the old power-on automatic start-up detection circuit scheme of the vehicle platform has large resistance and slow discharge, and the failure rate of the automatic start-up after the power failure of the main machine is powered on again is high.
On the basis of realizing quick and effective discharge, the power-on automatic starting detection circuit 120 provided by the application has the advantages of simple circuit structure and high reliability, can replace old power-on automatic starting detection circuit schemes of a hand table and a vehicle table at the same time, realizes the unification of power-on automatic starting schemes of different products, and reduces the circuit cost. Therefore, the problem that the consistency of the scheme performance of the old power-on automatic start-up detection circuit of the mobile phone is poor can be solved, the problems that material replacement of the old scheme of the mobile phone is inconvenient and circuit parameters need to be debugged again after the material is replaced can be solved, and the cost of later maintenance is reduced. For the vehicle platform, the problems of large resistance and slow discharge of a capacitor discharge circuit in the old power-on automatic start-up detection circuit scheme of the vehicle platform can be solved, and the success rate of the main machine power-on start-up again is improved.
In addition, the power-on auto-power-on detection circuit 120 provided by the present application is subjected to circuit simulation and testing. The old scheme of the vehicle platform, the old scheme of the hand platform and the power-on detection time and the capacitance discharge time of the new scheme provided by the application are shown in the following table 1:
TABLE 1
As can be seen from table 1 above, the power-on auto-power-on detection circuit 120 provided by the present application has great advantages in both the power-down capacitor discharge rate and the power-on detection time.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A power-on detection circuit, comprising:
a power-on input end;
the charging and discharging circuit is connected with the power-on input end;
the voltage maintaining circuit is connected with the charging and discharging circuit;
the signal output end is connected with the charge and discharge circuit;
when the power-on input end is powered on, the charging and discharging circuit and the voltage maintaining circuit are charged based on the voltage of the power-on input end, and a detection signal is output by using the signal output end; when the power-on input end is powered off, the charging and discharging circuit discharges based on the voltage of the power-on input end and the voltage maintained by the voltage maintaining circuit.
2. The power-on detection circuit of claim 1, wherein the charge and discharge circuit comprises:
a first end of the first capacitor is connected with the power-on input end and the voltage maintaining circuit, and a second end of the first capacitor is connected with the signal output end;
and the first path end of the switch unit is connected with the first end of the first capacitor, the second path end of the switch unit is connected with the second end of the first capacitor, and the control end of the switch unit is connected with the power-on input end.
3. The power-on detection circuit of claim 2, wherein the switch unit is a transistor.
4. The power-on detection circuit of claim 2, wherein the charge and discharge circuit further comprises a first resistor;
the first end of the first resistor is connected with the second path end of the switch unit, and the second end of the first resistor is connected with the second end of the first capacitor.
5. The power-on detection circuit of claim 2, wherein the charge and discharge circuit further comprises:
the anode of the first diode is connected with the power-on input end, and the output end of the first diode is connected with the first end of the first capacitor and the voltage maintaining circuit;
and the anode of the second diode is grounded, and the cathode of the second diode is connected with the second end of the first capacitor.
6. The power-on detection circuit of claim 5, wherein the voltage maintenance circuit comprises:
and a first end of the second capacitor is connected with the cathode of the first diode, and a second end of the second capacitor is grounded.
7. The power-on detection circuit according to claim 5, wherein the charge and discharge circuit further comprises a second resistor;
and the first end of the second resistor is connected with the second end of the first capacitor, and the second end of the second resistor is grounded.
8. An electronic device, characterized in that it comprises a power-on detection circuit according to any of claims 1-7.
9. The electronic device of claim 8, further comprising a digital signal processor and a switch;
the digital signal processor is connected with the power-on and power-on detection circuit and the switch and is used for controlling the switch to be kept on when receiving a detection signal output by a signal output end of the power-on and power-on detection circuit so as to realize power-on and power-on.
10. The electronic device of claim 8, further comprising a host power supply;
the host power supply is connected with the power-on input end of the power-on startup detection circuit and used for supplying power to the power-on startup detection circuit so as to power on the power-on input end of the power-on startup detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220826297.7U CN217588054U (en) | 2022-04-07 | 2022-04-07 | Power-on starting detection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220826297.7U CN217588054U (en) | 2022-04-07 | 2022-04-07 | Power-on starting detection circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN217588054U true CN217588054U (en) | 2022-10-14 |
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| CN202220826297.7U Active CN217588054U (en) | 2022-04-07 | 2022-04-07 | Power-on starting detection circuit and electronic equipment |
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