CN113721508A - Power-on and power-off time sequence control device and method - Google Patents
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Abstract
The application provides a power-on and power-off time sequence control device and a method, wherein the device comprises: the first power supply module is used for outputting a first voltage for supplying power to equipment; the second power supply module is used for outputting a second voltage for supplying power to the control switch module; the control switch module is used for outputting a detection signal according to the first voltage, wherein the detection signal is a first state electric signal or a second state electric signal; and a logic device for outputting a power-up/down timing signal according to a change of the detection signal. This application is through the direct voltage status output detection signal according to first voltage of control switch module to make logic device go on power-on and power-off time sequence control, it is fast to detect, can in time trigger power-on and power-off time sequence, and circuit structure is simple, low cost.
Description
Technical Field
The application relates to the technical field of electronic power, in particular to a power-on and power-off time sequence control device and method.
Background
With the development and popularization of electronic products, the demand for miniaturization and light weight of devices is increasing, and therefore chip manufacturers need to provide chips with higher integration, which also leads to the increase of the types of voltages required by the chips and the more complicated power-on and power-off timing control.
When the equipment normally works, if power failure happens due to some reason, data in a data storage (RAM) can be lost, in some fields of special application occasions such as measurement, control and the like, a CPU (central processing unit) can acquire and calculate some important data in normal work, and the data needs to be recovered after being electrified again. Therefore, in some single chip microcomputer application systems without a backup power supply function, it is necessary to store the important data in the EEPROM before the equipment is completely powered off, and a power-off timing control circuit is usually added in the system.
In the prior art, the power-off time sequence control is generally realized by adopting an additional voltage stabilizing circuit and a comparison circuit, comparing a power supply voltage with a stabilized voltage processed by the voltage stabilizing circuit through the comparison circuit, and outputting a detection signal to a CPU. Specifically, when the comparison circuit detects that the power supply voltage is reduced to be less than the stable voltage, the comparison circuit outputs a power-down signal to the CPU, so that a power-down time sequence is triggered, and corresponding data are stored. However, the scheme results in a complex whole circuit structure, and the large-scale production brings high cost; the detection signal output by the comparison circuit can cause overlong detection reaction time, and meanwhile, the false triggering of the power-off time sequence can be caused when the voltage shakes.
Disclosure of Invention
In view of the above, the present application provides a power-on and power-off timing control apparatus and method, which can perform power-on and power-off control and has the advantages of simple structure, low cost and fast detection reaction.
Specifically, the method is realized through the following technical scheme:
the application provides a power-on and power-off sequential control device, the device includes:
the first power supply module is used for outputting a first voltage for supplying power to equipment;
the second power supply module is used for outputting a second voltage for supplying power to the control switch module;
the control switch module is used for outputting a detection signal according to the first voltage, wherein the detection signal is a first state electric signal or a second state electric signal;
and the logic device is used for outputting an up-down power sequence signal according to the change of the detection signal.
The application also provides a power-on and power-off time sequence control method, which comprises the following steps:
obtaining a first voltage for powering a device;
acquiring a second voltage for supplying power to the control switch module;
controlling the control switch module to output a detection signal according to the first voltage, wherein the detection signal is a first state electric signal or a second state electric signal;
and outputting a power-up and power-down time sequence signal according to the change of the detection signal.
According to the power-on and power-off time sequence control device and method, the control switch is used for outputting the detection signal to the logic device, so that power-on and power-off time sequence control is performed, the circuit structure is effectively simplified, the cost is effectively controlled, meanwhile, the control switch directly outputs the detection signal according to the voltage state, the detection speed is high, and power-on and power-off time sequence control can be performed in time.
Drawings
In order to more clearly illustrate the technical solutions in the present specification, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in one or more embodiments of the present specification, and it is obvious for a person skilled in the art to obtain other drawings based on these drawings without any creative effort.
FIG. 1A is a block diagram of a power-on/power-off timing control apparatus according to an exemplary embodiment of the present application;
FIG. 1B is a schematic diagram illustrating a power down sequence control in accordance with an exemplary embodiment of the present application;
FIG. 1C is a schematic diagram illustrating a power-up sequence control in accordance with an exemplary embodiment of the present application;
FIG. 2 is a schematic diagram of a power-up and power-down timing control circuit according to an exemplary embodiment of the present application;
fig. 3 is a flowchart illustrating a power-up/power-down timing control method according to an exemplary embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that, although the terms first, second, etc. are used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
As described in the background art, in the prior art, the implementation of power-on and power-off timing control generally adopts the construction of an additional voltage stabilizing circuit and a comparison circuit, and when the comparison circuit detects that the power supply voltage drops to less than the stable voltage, the comparison circuit outputs a power-off signal to the CPU, so as to trigger the power-off timing and store corresponding data. The scheme can lead to the complexity of the whole circuit structure and high cost, when the equipment is powered off suddenly, the power failure detection circuit constructed by the method has longer reaction time, and meanwhile, because no interval is reserved for voltage shaking, the false triggering of the power-off time sequence can be caused when the voltage shakes.
The application provides a power-on and power-off time sequence control device, which can complete the operation of power-on and power-off time sequence control by adding a control switch into a circuit.
Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Fig. 1A shows a structure of a power-on/power-off timing control apparatus according to an embodiment of the present disclosure, where the power-off timing control apparatus may include a first power module 101, a second power module 102, a control switch module 103, and a logic device 104.
The first power module 101 is configured to output a first voltage for powering a device. The first voltage is typically high during normal operation of the device. The specific voltage value of the high level can be specifically set according to actual needs.
The second power module 102 is configured to output a second voltage for powering the control switch module 103. The second voltage is typically high when the control switch module 103 is operating normally. The specific voltage value of the high level can be specifically set according to actual needs.
The control switch module 103 is configured to output a detection signal according to the first voltage. The control switch module 103 has at least two states of on and off, controls the switching of the states by the first voltage, and outputs different detection signals in different states. For example, the detection signal is a first state electrical signal in the switch open state and a second state electrical signal in the switch closed state.
That is, when the switching state of the control switch module changes due to the first voltage, the signal output by the control switch module changes, and when the control switch switches from the closed state to the open state, the output second state electric signal changes to the output first state electric signal.
Conversely, when the control switch is switched from the open state to the closed state, the output of the first state electric signal is changed to the output of the second state electric signal.
The logic device 104 is configured to output an up-down electrical timing signal according to the change of the detection signal, that is, when the logic device detects that the detection signal changes between the first state electrical signal and the second state electrical signal, the logic device outputs the up-down electrical timing signal. Compared with the comparator for outputting the time sequence control signal, the logic device for outputting the time sequence signal can shorten the detection time.
The application provides a go up and down electric sequential control device utilizes control switch output detection signal to logic device to go up and down electric sequential control, effectively simplified circuit structure, and because the realization of this scheme only need add few extra devices, can make the cost obtain effective control, simultaneously because control switch directly outputs detection signal according to voltage status, and through electric sequential signal about the logic ware output, detection speed is fast, can be in time go up and down electric sequential control.
The power-down sequence control and the power-up sequence control of the device are further described below.
Fig. 1B illustrates a power-down timing control schematic diagram proposed by at least one embodiment of the present application.
When the first voltage is smaller than the control threshold of the control switch module 103, the output detection signal is a first state electrical signal. That is, when the device is powered down, that is, the first voltage output by the first power module 101 drops to be less than the threshold of the control switch module 103, the control switch module is changed from the closed state to the open state, and accordingly, the control switch module is changed from outputting the second state electrical signal to outputting the first state electrical signal.
In this case, the logic device 104 is specifically configured to output a power-off timing signal when the detection signal changes from the second state electrical signal to the first state electrical signal.
Fig. 1C illustrates a power-up timing control schematic diagram proposed by at least one embodiment of the present disclosure.
When the first voltage is not less than the control threshold of the control switch module 103, the output detection signal is a second state electrical signal. That is, when the device is powered on, that is, the first voltage output by the first power module 101 rises to be not less than the threshold of the control switch module 103, the control switch module changes from the closed state to the open state. At the moment, the control switch module changes from outputting the first state electric signal to outputting the second state electric signal.
At this time, the logic device 104 is specifically configured to output a power-on sequence signal when the detection signal changes from the first state electrical signal to the second state electrical signal.
In one example, the control switch module may include a transistor and a pull-up resistor. The base electrode of the transistor is connected with the first power supply module, and the collector electrode of the transistor is connected with the second power supply module through the pull-up resistor.
When the equipment is powered off, the first voltage is used as base voltage and is smaller than the minimum breakover voltage of the transistor, and the control switch module outputs a first state electric signal at the moment; when the device is powered on, the first voltage is used as a base voltage not less than the minimum on voltage of the transistor, and the switch module 103 is controlled to output a second state electric signal at the moment. Because there is a numerical difference between the minimum on-state voltage of the transistor and the first voltage, when the voltage of the first power module 101 is fluctuated, the power-off time sequence is prevented from being triggered by mistake.
In one example, the apparatus further includes a voltage dividing module, configured to divide the first voltage output by the first power supply module, and input the divided signal to the control switch module. The first voltage is divided and then enters the control switch module 103. When the first power module 101 generates voltage swing, the effect of avoiding mistaken triggering of the power-off time sequence can be further realized by adjusting the voltage dividing resistor.
In an example, the second power module 102 is specifically configured to perform voltage stabilization on the first voltage output by the first power module 101, and output the second voltage. Namely, the second voltage module can be an independent voltage module and outputs the second voltage; or, the first voltage is regulated, and when the device is powered off, that is, the first voltage drops, the second voltage is a stable voltage and does not drop together with the first voltage, but the second voltage continues to be maintained in an original state to supply power to the control switch module 103.
The above-described device embodiments are merely schematic for the device embodiments, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the application. One of ordinary skill in the art can understand and implement it without inventive effort.
A schematic circuit structure diagram of a power-on and power-off timing control device shown in the embodiment of the present application is shown in fig. 2.
In this embodiment, the control switch module outputs a detection signal to the logic device to implement power-up and power-down sequential control according to the power supply and the voltage stabilized by the switching power supply.
As shown in fig. 2, in this embodiment, the power-up and power-down timing control apparatus includes a first power module 201, a second power module 202, a control switch module 203, and a logic device 204, and the apparatus further includes a voltage dividing module 205.
The first power module 201 is used for outputting a first voltage VCC for supplying power to the device. When the equipment normally operates, the first voltage is at a high level. The specific voltage value of the high level can be specifically set according to actual needs.
The second power module 202 is configured to output a second voltage VCC1 for supplying power to the control switch module 203, where the second voltage VCC1 is at a high level. The specific voltage value of the high level can be specifically set according to actual needs. The second power module may include a switching power supply, and is specifically configured to perform voltage stabilization on the first voltage output by the first power module, and output the second voltage VCC 1.
The control switch module 203 is configured to output a detection signal according to the first voltage VCC. The control switch module comprises a triode and a pull-up resistor, the input end of the base electrode of the triode can be connected with a first voltage VCC output by the power supply, and the collector electrode of the triode is connected with a second voltage VCC 1; and the output end of the collector of the triode outputs a power failure detection signal. The control switch module 203 has two states of on and off, the switching of the states is controlled by the first voltage, and different detection signals are output under different states.
The logic device 204 is configured to output an up-down electrical timing signal according to the change of the detection signal, that is, when the logic device detects that the detection signal changes between the first state electrical signal and the second state electrical signal, the logic device outputs the up-down electrical timing signal.
The embodiment of the power-on/power-off timing control apparatus further includes a voltage dividing module 205, which is composed of voltage dividing resistors. As shown in fig. 2, the resistors R3, R4, R5, and R6 are configured to divide the first voltage VCC output by the first power module 201, and input the divided signal to the control switch module 203, so as to ensure that the first power module 202 responds quickly when it is powered down, the base voltage needs to be slightly greater than the base on voltage, and thus the resistances of the resistors R3, R4, R5, and R6 are determined.
Specifically, when the first power module 201 is powered down, VCC drops to cause the base voltage of the triode to be smaller than the minimum on voltage, the switch module 203 is controlled to be in an off state, a high level detection signal is output to the logic device 204, and after the logic device receives the level change, a power-off timing signal is output to protect equipment and store important data. When the voltage VCC of the first power supply module returns to normal, VCC rises to a voltage of the triode not less than the minimum on voltage, the switch module 203 is controlled to be in a closed state, a low level detection signal is output to the logic device 204, and after the logic device receives the level change, a power-on time sequence signal is output, equipment is protected, and important data are stored.
Corresponding to the embodiment of the power-on and power-off time sequence control device, the application also provides a power-on and power-off time sequence control method.
FIG. 3 is a flowchart illustrating a power-up/power-down timing control method according to at least one embodiment of the present application, which may include steps S111-S113
S311, acquiring a first voltage for supplying power to equipment; acquiring a second voltage for supplying power to the control switch module;
s312, controlling the control switch module to output a detection signal according to the first voltage, wherein the detection signal is a first state electric signal or a second state electric signal;
and S313, outputting a power-up and power-down time sequence signal according to the change of the detection signal. The controlling the control switch module to output the detection signal according to the first voltage comprises:
in one example, the output detection signal is a first state electrical signal; and/or the presence of a gas in the gas,
and under the condition that the first voltage is not less than the control threshold of the control switch module, the output detection signal is a second state electric signal.
In one example, the outputting of the power-up and power-down timing signal according to the change of the detection signal includes:
outputting a power-off timing signal in a case where the detection signal changes from the second-state electrical signal to the first-state electrical signal; and/or the presence of a gas in the gas,
outputting a power-on timing signal when the detection signal changes from the first state electrical signal to the second state electrical signal.
In one example, the control switch module includes a transistor and a pull-up resistor, wherein a base of the transistor is configured to receive the first voltage and a collector of the transistor receives the second voltage via the pull-up resistor.
In one example, the method further comprises:
and carrying out voltage division processing on the first voltage, and controlling the control switch module by using the divided signal.
In one example, the second power module is configured to regulate the first voltage output by the first power module, and output the second voltage separately.
Since it basically corresponds to the device embodiment, it is relatively simple to describe, and the relevant points can be referred to the partial description of the device embodiment, which is not repeated herein.
Embodiments of the subject matter and the functional operations described in this specification can be implemented in: digital electronic circuitry, tangibly embodied computer software or firmware, computer hardware including the structures disclosed in this specification and their structural equivalents, or a combination of one or more of them. Embodiments of the subject matter described in this specification can be implemented as one or more computer programs, i.e., one or more modules of computer program instructions, encoded on a tangible, non-transitory program carrier for execution by, or to control the operation of, data processing apparatus.
The processes and logic flows described in this specification can be performed by one or more programmable computers executing one or more computer programs to perform corresponding functions by operating on input data and generating output. The processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic circuitry, e.g., a CPLD (complex programmable logic device).
While this specification contains many specific implementation details, these should not be construed as limitations on the scope of any invention or of what may be claimed, but rather as descriptions of features specific to particular embodiments of particular inventions. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. In other instances, features described in connection with one embodiment may be implemented as discrete components or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.
Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking and parallel processing may be advantageous. Moreover, the separation of various system modules and components in the embodiments described above should not be understood as requiring such separation in all embodiments, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (12)
1. An electrical power-on and power-off sequence control apparatus, comprising:
the first power supply module is used for outputting a first voltage for supplying power to equipment;
the second power supply module is used for outputting a second voltage for supplying power to the control switch module;
the control switch module is used for outputting a detection signal according to the first voltage, wherein the detection signal is a first state electric signal or a second state electric signal;
and the logic device is used for outputting an up-down power sequence signal according to the change of the detection signal.
2. The apparatus of claim 1, wherein the control switch module is specifically configured to:
under the condition that the first voltage is smaller than a control threshold of the control switch module, the output detection signal is a first state electric signal; and/or the presence of a gas in the gas,
and under the condition that the first voltage is not less than the control threshold of the control switch module, the output detection signal is a second state electric signal.
3. The apparatus of claim 1, wherein the logic device is specifically configured to:
the logic device outputs a power-down timing signal in a case where the detection signal changes from the second-state electrical signal to the first-state electrical signal; and/or the presence of a gas in the gas,
the logic device outputs a power-on timing signal in a case where the detection signal changes from the first state electric signal to the second state electric signal.
4. The apparatus of any of claims 1-3, wherein the control switch module comprises a transistor and a pull-up resistor, wherein a base of the transistor is connected to the first power module and a collector of the transistor is connected to the second power module through the pull-up resistor.
5. The device according to any one of claims 1 to 3, further comprising a voltage dividing module, configured to divide the first voltage output by the first power supply module, and input the divided signal to the control switch module.
6. The apparatus according to any one of claims 1 to 3, wherein the second power module is specifically configured to perform voltage stabilization on the first voltage output by the first power module, and output the second voltage.
7. A power-on and power-off sequence control method is characterized by comprising the following steps:
obtaining a first voltage for powering a device;
acquiring a second voltage for supplying power to the control switch module;
controlling the control switch module to output a detection signal according to the first voltage, wherein the detection signal is a first state electric signal or a second state electric signal;
and outputting a power-up and power-down time sequence signal according to the change of the detection signal.
8. The method of claim 7, wherein the controlling the control switch module to output the detection signal according to the first voltage comprises:
under the condition that the first voltage is smaller than a control threshold of the control switch module, the output detection signal is a first state electric signal; and/or the presence of a gas in the gas,
and under the condition that the first voltage is not less than the control threshold of the control switch module, the output detection signal is a second state electric signal.
9. The method of claim 8, wherein outputting a power-up and power-down timing signal according to the change of the detection signal comprises:
outputting a power-off timing signal in a case where the detection signal changes from the second-state electrical signal to the first-state electrical signal; and/or the presence of a gas in the gas,
outputting a power-on timing signal when the detection signal changes from the first state electrical signal to the second state electrical signal.
10. The method according to any one of claims 7 to 9, wherein the control switch module comprises a transistor and a pull-up resistor, wherein a base of the transistor is configured to receive the first voltage and a collector of the transistor receives the second voltage via the pull-up resistor.
11. The method according to any one of claims 7 to 9, further comprising:
and carrying out voltage division processing on the first voltage, and controlling the control switch module by using the divided signal.
12. The method according to claim 7, wherein the second power module is configured to regulate the first voltage output by the first power module, and output the second voltage separately.
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| CN114995262A (en) * | 2022-08-05 | 2022-09-02 | 成都万创科技股份有限公司 | Power supply time sequence control method and system of X86 platform |
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