CN216721292U - Reset circuit - Google Patents
Reset circuit Download PDFInfo
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- CN216721292U CN216721292U CN202123435519.7U CN202123435519U CN216721292U CN 216721292 U CN216721292 U CN 216721292U CN 202123435519 U CN202123435519 U CN 202123435519U CN 216721292 U CN216721292 U CN 216721292U
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- reset
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- control module
- charging
- switch
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Abstract
The utility model discloses a reset circuit. A reset circuit, comprising: the device comprises a power supply, a charging module, a switch control module and a reset switch module; one end of the charging module is connected with the power supply, and the other end of the charging module is connected with the reset switch module; one end of the switch control module is connected with the power supply, and the other end of the switch control module is connected with the reset switch module; one end of the reset switch module is connected with a reset pin contained in the control module. The technical scheme of this embodiment has solved and has adopted the chip that resets with high costs to and the foot that resets is not in unsettled state when normal work and leads to control module's the foot that resets to produce the problem of reverse leakage current easily, has reached and has realized the time delay with lower cost and reset, and can not produce the effect of reverse leakage current.
Description
Technical Field
The embodiment of the utility model relates to a circuit structure technology, in particular to a reset circuit.
Background
In most electronic devices on the market at present, after a master control driving chip in the electronic device is powered on, internal reset work which needs a period of time, namely power-on reset is usually performed; the main function is to set the special function register inside the main control driving chip in initial state to make the main control driving chip hardware and software start working from a determined and unique starting point.
In the prior art, a reset chip is generally adopted for time delay reset or an RC circuit formed by a series resistor and a capacitor is adopted for time delay reset.
However, the prior art has the following technical defects: most reset chips are internally integrated, so that the circuit cost is high; when the series resistor and capacitor RC circuit is powered off, if reverse leakage current exists in the reset pin of the chip, the chip cannot be reset normally.
SUMMERY OF THE UTILITY MODEL
The utility model provides a reset circuit, which realizes delayed reset at lower cost and does not generate reverse leakage current.
An embodiment of the present invention provides a reset circuit, including: the device comprises a power supply, a charging module, a switch control module and a reset switch module; one end of the charging module is connected with the power supply, and the other end of the charging module is connected with the reset switch module; one end of the switch control module is connected with the power supply, and the other end of the switch control module is connected with the reset switch module; one end of the reset switch module is connected with a reset pin contained in the control module.
Optionally, the reset switch module is configured to send a reset signal to the control module based on the reset pin to control the control module to reset.
Optionally, the switch control module includes a first resistor, the charging module includes a second resistor and a capacitor, and the reset switch module includes an NPN transistor.
Optionally, one end of the first resistor is connected to the output end of the power supply, and the other end of the first resistor is connected to the base of the NPN transistor.
Optionally, one end of the second resistor is connected to the output end of the power supply, and the other end of the second resistor is connected to one end of the capacitor.
Optionally, one end of the capacitor is connected to the second resistor, and the other end is grounded.
Optionally, a base of the NPN triode is connected to the first resistor, an emitter of the NPN triode is connected to the second resistor and the capacitor, and a collector of the NPN triode is connected to a reset pin included in the control module.
Optionally, the power supply is configured to charge the charging module in a charging cycle of the charging module; the switch control module is used for controlling the reset switch module to be turned on in the charging period so that the reset switch module sends a reset signal to the control module based on the reset pin.
Optionally, the switch control module is further configured to control to close the reset switch module after the charging period is ended.
Optionally, when the reset switch module is turned off, the reset pin included in the control module is in a suspended state.
The technical scheme of the embodiment provides a reset circuit, which comprises a power supply, a charging module, a switch control module and a reset switch module; one end of the charging module is connected with the power supply, and the other end of the charging module is connected with the reset switch module; one end of the switch control module is connected with the power supply, and the other end of the switch control module is connected with the reset switch module; one end of the reset switch module is connected with the reset pin contained in the control module, so that the problem that the reset pin of the control module is easy to generate reverse leakage current due to the fact that the reset chip is high in cost and the reset pin is not in a suspended state in normal work is solved by utilizing the adjustable charging period of the reset switch module, and the effects of realizing delay reset at low cost and avoiding generating reverse leakage current are achieved.
These and other aspects of the present application will be more readily apparent from the following description.
Drawings
Fig. 1 is a functional block diagram of a reset circuit according to an embodiment of the present invention;
fig. 2 is a circuit configuration diagram of a reset circuit according to an embodiment of the present invention.
Reference numerals:
10-reset circuit, 11-control module, 110-power supply, 120-charging module, 130-switch control module and 140-reset switch module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.
The terms "first" and "second" and the like in the description and drawings of the present application are used for distinguishing different objects or for distinguishing different processes for the same object, and are not used for describing a specific order of the objects.
Furthermore, the terms "including" and "having," and any variations thereof, as referred to in the description of the present application, 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.
Before discussing exemplary embodiments in greater detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like. In addition, the embodiments and features of the embodiments in the present invention may be combined with each other without conflict.
It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
In the description of the present application, the meaning of "a plurality" means two or more unless otherwise specified.
Fig. 1 is a functional block diagram of a reset circuit according to an embodiment of the present invention, where the reset circuit may be suitable for performing power-on reset on a main control driver chip, may be implemented by software and/or hardware, and may be integrated in the main control chip.
As shown in fig. 1, the reset circuit 10 includes: a power supply 110, a charging module 120, a switch control module 130, and a reset switch module 140; one end of the charging module 120 is connected to the power source 110, and the other end is connected to the reset switch module 140; one end of the switch control module 130 is connected to the power source 110, and the other end is connected to the reset switch module 140; one end of the reset switch module 140 is connected to a reset pin included in the control module 11.
The control module may be a main control driving chip, for example, a common single chip or a Micro Control Unit (MCU). Although the power supply 110 belongs to the reset circuit 10, it can also supply power to the control module 11. The power supply 110 is used for charging the charging module 120 in the charging cycle of the charging module; the switch control module 130 is configured to control to turn on the reset switch module 130 during the charging period, so that the reset switch module 130 sends a reset signal to the control module 11 based on the reset pin. The switch control module 130 is further configured to control the reset switch module 140 to be turned off after the charging period is ended.
In this embodiment, optionally, the reset switch module 140 is configured to send a reset signal to the control module 11 based on the reset pin to control the control module 11 to reset.
For example, one end of the reset switch module 140 is connected to a reset pin of the single chip to perform power-on reset on the single chip.
In this embodiment, optionally, the switch control module 130 includes a first resistor, the charging module 120 includes a second resistor and a capacitor, and the reset switch module includes an NPN transistor.
The resistance values of the first resistor and the second resistor and the capacitance of the capacitor are not specifically limited, and can be determined according to actual requirements; the NPN triode is a core component of the reset switch module, and the known output characteristic curve of the NPN triode provides possibility for realizing a suspended state.
The advantage of this arrangement is that the reset switch effect is achieved by the cut-off region and the saturation region of the transistor.
In this embodiment, optionally, one end of the first resistor is connected to the output end of the power supply, and the other end of the first resistor is connected to the base of the NPN transistor.
That is, one end of the switch control module 130 is connected to the power source 110, and the other end is connected to the reset switch module.
In this embodiment, optionally, one end of the second resistor is connected to the output terminal of the power supply 110, and the other end is connected to one end of the capacitor. One end of the capacitor is connected with the second resistor, and the other end of the capacitor is grounded.
The advantage of this setting is that through the RC circuit and the triode that second resistance and electric capacity constitute, reach the effect of adjusting the charge cycle.
In this embodiment, optionally, a base of the NPN triode is connected to the first resistor, an emitter of the NPN triode is connected to the second resistor and the capacitor, and a collector of the NPN triode is connected to the reset pin included in the control module 11.
Under the condition that the control module 11 is an MCU, the collector of the NPN triode is connected with the reset control pin of the MCU.
In this embodiment, optionally, when the reset switch module 140 is turned off, the reset pin included in the control module is in a floating state.
Fig. 2 is a circuit structure diagram of a reset circuit according to an embodiment of the present invention. As shown in fig. 2, VIN is an input voltage, corresponding to the power supply 110 in fig. 1; r1 is a first resistor corresponding to the switch control module 130 of fig. 1; r2 is a second resistor, C1 is a capacitor, and an RC circuit formed by R2 and C1 corresponds to the charging module 120 in fig. 1; q1 is an NPN transistor corresponding to the reset switch module 140 in fig. 1. The NPN type triode consists of three semiconductors, including two N type semiconductors and one P type semiconductor, the P type semiconductor is in the middle, the two N type semiconductors are on both sides, which are important devices in electronic circuits, and usually play the role of current amplification and switching. As shown in fig. 2, the transistor Q1 has a Base (Base) B, an Emitter (Emitter) E, and a Collector (Collector) C.
That is, one end of the charging module 120 is connected to the power source 110, and the other end is grounded. When the power supply is powered on, the power supply charges the reset switch module 140 through the charging module 120, the charging time is determined by a circuit of the charging module 120, specifically, the charging period T is C1 × R2, after the charging of the reset switch module 140 is completed, the switch control module 130 turns on a switch of the reset switch module 140, and at this time, the reset circuit 10 transmits the reset signal to the control module 11 through the reset switch module 140. That is, the reset time of the control module 11, such as the MCU, can be controlled by adjusting the resistance R2 of the second resistor and the capacitance C1 of the capacitor in the charging module.
At the beginning of charging the reset switch module 140 by the charging module 120, the E-pole of the transistor Q1 is in a low state, the B-pole of the transistor is in a high state, and when the voltage V of the B-pole is greater than V, the voltage V of the B-pole is lower than VBGreater than E voltage VEWhen Q1 is conducted, the C of the triode Q1 is at low level; during the charging period T, the E-pole level of transistor Q1 gradually rises, at VBGreater than VEUnder the condition (1), the triode Q1 is still in a conducting state, and the voltage of the C end is equal to that of the E end; when the charging period T is over, the voltage of E is equal to VIN, and V is equal to VINBIs equal to VEWhen Q1 is turned off, the reset pin connected to the C-terminal of transistor Q1 is floating. To this end, the reset circuit 10 provides a reset signal to the reset pin of the control module for resetting after the power-on is completed, and the reset pin of the control module 110 is in a floating state after the resetting is completed for a period of time.
The technical scheme of the embodiment provides a reset circuit, which comprises a power supply, a charging module, a switch control module and a reset switch module; one end of the charging module is connected with the power supply, and the other end of the charging module is connected with the reset switch module; one end of the switch control module is connected with the power supply, and the other end of the switch control module is connected with the reset switch module; one end of the reset switch module is connected with the reset pin contained in the control module, so that the problem that the reset pin of the control module is easy to generate reverse leakage current due to the fact that the reset pin is not in a suspended state during normal work by utilizing the adjustable charging period of the reset switch module is solved, and the effect of preventing the reverse leakage current from being generated at low cost is achieved.
It should be noted that, in the embodiment of the reset circuit, the included units and modules are only divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, the specific names of the functional units are only for the convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A reset circuit, comprising: the device comprises a power supply, a charging module, a switch control module and a reset switch module; one end of the charging module is connected with the power supply, and the other end of the charging module is connected with the reset switch module; one end of the switch control module is connected with the power supply, and the other end of the switch control module is connected with the reset switch module; one end of the reset switch module is connected with a reset pin contained in the control module.
2. The reset circuit of claim 1, wherein the reset switch module is configured to send a reset signal to the control module based on the reset pin to control the control module to reset.
3. The reset circuit of claim 2, wherein the switch control module comprises a first resistor, the charging module comprises a second resistor and a capacitor, and the reset switch module comprises an NPN transistor.
4. The reset circuit of claim 3, wherein one end of the first resistor is connected to the output terminal of the power supply, and the other end of the first resistor is connected to the base of the NPN transistor.
5. The reset circuit according to claim 3, wherein one end of the second resistor is connected to an output terminal of the power supply, and the other end is connected to one end of the capacitor.
6. The reset circuit of claim 3, wherein one end of the capacitor is connected to the second resistor and the other end is connected to ground.
7. The reset circuit of claim 3, wherein a base of the NPN transistor is connected to the first resistor, an emitter of the NPN transistor is connected to the second resistor and the capacitor, and a collector of the NPN transistor is connected to the reset pin included in the control module.
8. The reset circuit of claim 2, wherein the power supply is configured to charge the charging module during a charging cycle of the charging module; the switch control module is used for controlling and opening the reset switch module in the charging period so that the reset switch module sends the reset signal to the control module based on the reset foot.
9. The reset circuit of claim 8, wherein the switch control module is further configured to control the reset switch module to be turned off after the charging period is ended.
10. The reset circuit of claim 2, wherein the reset pin included in the control module is in a floating state when the reset switch module is turned off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123435519.7U CN216721292U (en) | 2021-12-31 | 2021-12-31 | Reset circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123435519.7U CN216721292U (en) | 2021-12-31 | 2021-12-31 | Reset circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216721292U true CN216721292U (en) | 2022-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123435519.7U Active CN216721292U (en) | 2021-12-31 | 2021-12-31 | Reset circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216721292U (en) |
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2021
- 2021-12-31 CN CN202123435519.7U patent/CN216721292U/en active Active
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