CN105425927A - Multi-key reset circuit and electronic product provided with same - Google Patents
Multi-key reset circuit and electronic product provided with same Download PDFInfo
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- CN105425927A CN105425927A CN201511002172.3A CN201511002172A CN105425927A CN 105425927 A CN105425927 A CN 105425927A CN 201511002172 A CN201511002172 A CN 201511002172A CN 105425927 A CN105425927 A CN 105425927A
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The invention discloses a multi-key reset circuit and an electronic product provided with the same. The multi-key reset circuit is provided with N reset keys, N current-limiting resistors and N diodes, and N is a positive integer larger than 1; the N reset keys and the N current-limiting resistors are connected in series in a one-to-one correspondence mode to form N series-connected branches, and the N series-connected branches are connected between a power supply and a ground wire respectively; anodes of the N diodes are connected to intermediate nodes of the reset keys and the current-limiting resistors in the N series-connected branches in the one-to-one correspondence manner, and cathodes of the N diodes are connected with a reset signal output end. The multiple keys are arranged on the electronic product, a system executes reset operation when and only when all the reset keys are pressed down simultaneously, and the probability of simultaneous pressing down of the multiple reset keys is very low in a normal use process of the electronic product, so that the problem of mistaken reset of the system due to misoperation of a user can be basically solved and the system operation reliability is improved.
Description
Technical field
The invention belongs to electronic circuit technology field, relate to a kind of reset circuit, specifically, relate to a kind of reset key that utilizes and the circuit design of reset operation is carried out to electronic product.
Background technology
Reset circuit is that one is widely used in electronic product, for improving electronic product reliability of operation and custom-designed tandem circuit.There is the situation of software stuck (deadlock) in a lot of electronic product occasional in operational process, when running into this situation, if without manipulable hardware reset button or other resetting means, the mode that direct power-off or machine of tearing open then can only be taked to reprocess resets to system software, make system roll-back, not only troublesome poeration, but also temporal unnecessary waste can be caused.Therefore, electronic product designs reset circuit particularly necessary.
Existing reset circuit is mostly key reset circuit, that is, electronic product designs independently reset key, be specifically designed to reset operation.This reset key only arranges one usually, when system is stuck, by pressing described reset key, can reset by Control System Software, restarting operation.Electronic product adopts this key reset circuit design; often there will be electronic product in normal course of operation because user presses reset key because of carelessness; and cause system software to enter the situation of reset mode mistakenly, thus have impact on the normal operation of electronic product and the experience of user.
In order to avoid the maloperation of user, reset key is embedded in the housing of product by some electronic product completely, namely on the housing of electronic product, designs reset pin hole, is built in by reset key in reset pin hole, by triggering the reset key in pin hole, control system resets.This design is by being arranged at the not accessible position of user by reset key, although the problem resetted can be solved by mistake, but user is when each execution reset operation, a kind of needlelike object must be found to extend in reset pin hole, just reset key can be touched, perform reset operation, this adds the difficulty that user performs reset operation undoubtedly.
Summary of the invention
The object of the present invention is to provide a kind of many key reset circuit, while facilitating user to perform reset operation, the probability occurred that by mistake resets can be reduced as much as possible.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of many key reset circuit, are provided with N number of reset key, N number of current-limiting resistance and N number of diode, described N be greater than 1 positive integer; Described N number of reset key is connected with N number of current-limiting resistance one_to_one corresponding, and form N bar series arm, described N bar series arm is connected between power supply and ground wire; The anode of N number of diode is connected to the intermediate node of reset key and current-limiting resistance in N bar series arm correspondingly, and the negative electrode of N number of diode connects reset signal output terminal.
Further, when described current-limiting resistance is connected between described power supply and reset key, when described reset key is connected between current-limiting resistance and ground wire; What described reset key should select non-self-lock-ing often opens button, when adopting this circuit design mode, and the reset signal Low level effective exported by described reset signal output terminal.And when described reset key is connected between described power supply and current-limiting resistance, when described current-limiting resistance is connected between reset key and ground wire; Described reset key should select the normally closed button of non-self-lock-ing, when adopting this circuit design mode, and the reset signal Low level effective exported by described reset signal output terminal.
In order to eliminate the issuable misoperation of key jitter, preferably described reset signal output terminal being passed through filter capacitor ground connection, with the shake waveform in filtering reset signal, guaranteeing that the reset signal exported by reset signal output terminal is stablized.
In order to ensure the balance of N bar circuit branch work, described N number of reset key preferably adopts the mechanical key of same model, and described N number of current-limiting resistance preferably adopts the resistive element of similar resistance, and described N number of diode preferably adopts the switching diode of same model.
Further, described reset signal output terminal is connected the reset pin of a control module, export reset signal to described control module, reset to control described control module.
Based on above-mentioned many key reset circuit, the invention allows for a kind of electronic product with reset key, be provided with N number of reset key, N number of current-limiting resistance and N number of diode, described N be greater than 1 positive integer; Described N number of reset key is connected with N number of current-limiting resistance one_to_one corresponding, and form N bar series arm, described N bar series arm is connected between power supply and ground wire; The anode of N number of diode is connected to the intermediate node of reset key and current-limiting resistance in N bar series arm correspondingly, and the negative electrode of N number of diode connects reset signal output terminal.
Preferably, as described N=2, when being namely provided with two reset keys on electronic product, consider that user is when handheld electric products, finger can touch the relative both sides of electronic product simultaneously, if on the same side two reset keys being laid in electronic product or on relative two sides of the electronic product that is placed in, then probably there will be false triggering.Given this, the present invention preferably the reset key described in two is placed in electronic product housing on adjacent two sides, to reduce the probability of maloperation.
As described N>2, when being namely provided with the reset key of more than three or three on electronic product, because the quantity of reset key is more, even if user's handheld electric products, the probability simultaneously pressing all reset keys is inadvertently also very little, and therefore, user performs the consideration of reset operation for convenience, the present invention preferably described N number of reset key is placed in electronic product housing on relative two sides so that user's manipulation.
Preferably, described electronic product is portable type electronic product, and described power supply is the direct supply that the battery in electronic product exports or the direct supply conversion generation exported battery via the power circuit in electronic product.
Compared with prior art, advantage of the present invention and good effect are: the present invention by arranging multiple reset key on electronic product, if and only if when all reset keys are pressed simultaneously, system just performs reset operation, because electronic product is in normal use procedure, the probability that multiple reset key is pressed simultaneously is extremely low, therefore the system reset issues by mistake caused because of user misoperation can substantially be solved, raising system operation reliability while, also solve system software stuck after reparation problem.In addition, many key reset circuit simplicity of design of the present invention, cost is low, be easy to realize, can increase or delete the quantity of reset key according to actual needs easily, be applicable to being applied in all needs operation push-buttons and carry out in the design of electronic products of hardware reset, to improve the experience of user.
After reading the detailed description of embodiment of the present invention by reference to the accompanying drawings, the other features and advantages of the invention will become clearly.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the tandem circuit of many key reset circuit proposed by the invention;
Fig. 2 is the circuit theory diagrams with a kind of embodiment of the reset circuit of three reset keys based on the tandem circuit design shown in Fig. 1;
Fig. 3 is the circuit theory diagrams of a kind of embodiment of reset circuit based on the design of two reset keys;
Fig. 4 is the circuit theory diagrams of a kind of embodiment of reset circuit based on the design of four reset keys;
Fig. 5 is the circuit theory diagrams of another embodiment of the tandem circuit of many key reset circuit proposed by the invention;
Fig. 6 is the circuit theory diagrams with a kind of embodiment of the reset circuit of three reset keys based on the tandem circuit design shown in Fig. 5;
Fig. 7 is the installation position schematic diagram of the reset key of two shown in Fig. 3 on electronic product;
Fig. 8 is the installation position schematic diagram of the reset key of three shown in Fig. 2 or Fig. 6 on electronic product.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in more detail.
The present embodiment is for the electronic product adopting the design of button resetting technique, propose a kind of many buttons resetting technique, by laying multiple reset key on electronic product, and design reset circuit and only just export effective reset signal when described multiple reset keys are all pressed, Control System Software resets and restarts, the probability that maloperation occurs user can be reduced significantly thus, solve the problem that system software resets by mistake.
Can increase easily according to the actual needs of self in order to make different electronic products or delete the quantity of reset key, the present embodiment is when designing described reset circuit, take into full account the extensibility of circuit design, adopt the mode based on a reset key design basis circuit, to reach the object simplifying circuit design.
Below by two specific embodiments, described tandem circuit and the physical circuit design of many key reset circuit designed based on described tandem circuit and principle of work are described in detail.
Embodiment one
Fig. 1 shows wherein a kind of design of tandem circuit.In Fig. 1, S is reset key, and the mechanical switch open in usual (that is, non-self-lock-ing often opens button) that preferred employing does not have auto-lock function carries out circuit design; R is current-limiting resistance; D is diode.After described reset key S is connected with current-limiting resistance R, be connected between power supply VCC and ground wire, the anode of diode D is connected to the intermediate node of reset key S and current-limiting resistance R, the negative electrode of diode D connects reset signal output terminal RESET, for output reset signal.
As a kind of preferred design of the present embodiment, preferably described current-limiting resistance R is connected between power supply VCC and reset key S, and reset key S is connected between current-limiting resistance R and ground wire, as shown in Figure 1.When reset key S is not pressed, power supply VCC acts on the anode of diode D by current-limiting resistance R, and control diode D conducting, putting reset signal is invalid high level state.When reset key S is pressed, the anode potential of diode D is pulled down to ground, and diode D oppositely ends, and putting reset signal is effective low level state.
In the present embodiment, described power supply VCC is direct supply, can be provided by the power circuit in electronic product.Be the portable type electronic products such as mobile phone, PAD, intelligent watch for electronic product, can directly provide described direct supply VCC by the battery in electronic product, provide after also can changing the direct supply that battery exports via the power circuit in electronic product.The present embodiment does not specifically limit this.
Based on the tandem circuit shown in Fig. 1, for needing the electronic product arranging three reset keys, three tunnel expansions can be carried out to the tandem circuit shown in Fig. 1, forming three key reset circuit as shown in Figure 2.In Fig. 2, S1, S2, S3 are three non-self-lock-ing reset key open in usual; R1, R2, R3 be respectively with described three corresponding current-limiting resistances of connecting of reset key S1, S2, S3; D1, D2, D3 are the diode connected one to one with the intermediate node of three series arms respectively, and the negative electrode of described diode D1, D2, D3 is all connected to reset signal output terminal RESET.Be connected with the control module in electronic product by described reset signal output terminal RESET, the reset pin to control module exports reset signal, with when system software is stuck, controls described control module and resets.
Adopt the electronic product of three key reset circuit designs as shown in Figure 2, low level resets, and its principle of work is as follows:
When being arranged on electronic product three reset keys S1, S2, S3 and all not pressing, diode D1, D2, D3 conducting, now, the current potential of reset signal output terminal RESET is high level, and electronic product does not perform reset operation.
When three in Fig. 2 reset key S1, S2, a S3 have any one to be pressed, all the other two when not pressing, the diode reverse that connect corresponding to the reset key be pressed is ended, all the other two diodes still maintain conducting state, now, the current potential of reset signal output terminal RESET is still high level, and therefore electronic product does not perform reset operation.
When three in Fig. 2 reset key S1, S2, a S3 have any two to be pressed, remain one when not being pressed, two diode reverse connecting corresponding to the reset key be pressed are ended, a remaining diode still maintains conducting state, now, the current potential of reset signal output terminal RESET is still high level, and therefore electronic product does not perform reset operation.
When being arranged on electronic product three reset keys S1, S2, S3 and being all pressed, diode D1, D2, D3 all oppositely end, now, the jump in potential of reset signal output terminal RESET becomes low level, i.e. effective status, controls electronic product and performs reset operation, and the system program that in electronic product, control module runs is resetted, then, when software is stuck, the reparation to electronic product is realized.
In order to prevent user when pressing reset key S1, S2, S3, cause system to occur misoperation because of key jitter, the present embodiment preferably described reset signal output terminal RESET be connected a filter capacitor C1 between ground wire, the capacitance of described filter capacitor C1 is preferably 100nF, with filtering shake waveform, ensure the stable of reset signal waveform.
Certainly, also two-way expansion can be carried out to the tandem circuit shown in Fig. 1, to form the reset circuit with two-way reset key S4, S5, as shown in Figure 3.Similarly, also can carry out four tunnel expansions to the tandem circuit shown in Fig. 1, to form the reset circuit with four road reset key S6, S7, S8, S9, as shown in Figure 4.The concrete annexation of the many key reset circuit shown in Fig. 3, Fig. 4 and principle of work can with reference to the above-mentioned concrete elaborations to three key reset circuit shown in Fig. 2, and the present embodiment no longer launches explanation at this.
Embodiment two
Fig. 5 shows another design of tandem circuit.In Fig. 5, S ' is reset key, and the normally closed type mechanical switch (that is, the normally closed button of non-self-lock-ing) that preferred employing does not have auto-lock function carries out circuit design; R ' is current-limiting resistance; D ' is diode.After described reset key S ' is connected with current-limiting resistance R ', be connected between power supply VCC and ground wire, the anode of diode D ' is connected to the intermediate node of reset key S ' and current-limiting resistance R ', the negative electrode of diode D ' connects reset signal output terminal RESET, for output reset signal.
As a kind of preferred design of the present embodiment, preferably described reset key S ' is connected between power supply VCC and current-limiting resistance R ', current-limiting resistance R ' is connected between reset key S ' and ground wire, as shown in Figure 2.When reset key S ' is not pressed, reset key S ' keeps normally off, and power supply VCC acts on the anode of diode D ' by reset key S ', and control diode D ' conducting, putting reset signal is invalid high level state.When reset key S ' is pressed, reset key S ' disconnects, and the anode potential of diode D ' is pulled down to ground by current-limiting resistance R ', and diode D ' oppositely ends, and putting reset signal is effective low level state.
Based on the tandem circuit shown in Fig. 5, for needing the electronic product arranging three reset keys, three tunnel expansions can be carried out to the tandem circuit shown in Fig. 5, forming three key reset circuit as shown in Figure 6.In Fig. 6, S1 ', S2 ', S3 ' are the reset key of three non-self-lock-ing normally closed types; R1 ', R2 ', R3 ' be respectively with described three reset key S1 ', S2 ', the corresponding current-limiting resistance of connecting of S3 '; D1 ', D2 ', D3 ' are the diode connected one to one with the intermediate node of three series arms respectively, and the negative electrode of three described diode D1 ', D2 ', D3 ' is connected to reset signal output terminal RESET.Described reset signal output terminal RESET can be connected with the control module in electronic product, exports reset signal with the reset pin to control module, then when system software is stuck, resets, restart operation for the system software controlled in described control module.
Adopt the electronic product of three key reset circuit designs as shown in Figure 6, low level resets, and its principle of work is as follows:
When being arranged on electronic product three reset key S1 ', S2 ', S3 ' and all not pressing, three reset key S1 ', S2 ', S3 ' are all kept closed, now, diode D1 ', D2 ', D3 ' conducting, the current potential putting reset signal output terminal RESET is high level, and thus electronic product does not perform reset operation.
When having any one to be pressed in three in Fig. 6 reset key S1 ', S2 ', S3 ', and all the other two when not being pressed, namely one of them reset key disconnects, when two other reset key is still kept closed, the diode reverse that connect corresponding to the reset key be pressed is ended, and all the other two diodes still keep conducting state.Now, the current potential of reset signal output terminal RESET is still high level, and therefore, electronic product does not perform reset operation.
When having any two to be pressed in three in Fig. 6 reset key S1 ', S2 ', S3 ', remain one when not being pressed, namely wherein two reset keys disconnect, when another one reset key is still kept closed, two diode reverse connecting corresponding to the reset key be pressed are ended, and a remaining diode still keeps conducting state.Now, the current potential of reset signal output terminal RESET is still high level, and therefore, electronic product does not perform reset operation.
When being arranged on electronic product three reset key S1 ', S2 ', S3 ' and being all pressed, three reset key S1 ', S2 ', S3 ' are all in off-state, now, three diode D1 ', D2 ', D3 ' all oppositely end, and the jump in potential of reset signal output terminal RESET becomes low level, i.e. effective status, control electronic product and perform reset operation, the system program that in electronic product, control module runs is resetted, then when software is stuck, realizes the reparation to electronic product.
Same, also preferably connect filter capacitor C1 further at described reset signal output terminal RESET, to play the effect eliminating key jitter.
Certainly, based on the tandem circuit shown in Fig. 5, also two-way, four tunnels or more multichannel expansion can be carried out, to form the reset circuit with N road reset key, the concrete annexation of its circuit and principle of work can refer to above-mentioned illustrating three key reset circuit shown in Fig. 6, and the present embodiment no longer launches explanation at this.
In order to ensure the balance of tandem circuit work N number of in many key reset circuit, N number of described reset key preferably adopts the mechanical key of same model; N number of described current-limiting resistance preferably adopts the resistive element of similar resistance, and such as resistance is the conventional resistive of 1K Ω; N number of described diode preferably adopts the switching diode of same model, to improve the stability of reset circuit work.
For preventing user when normally using electronic product further, triggered by N number of reset key unintentionally, cause electronic product to miss the generation of reset case, the present embodiment has also carried out particular design to the installation position of N number of reset key on electronic product simultaneously.
For the electronic product only arranging two reset keys; consider that user is when handheld electric products operates; such as, when handheld mobile phone call or hand-held PAD see video; finger often can touch the relative both sides of electronic product simultaneously; if on the same side two reset keys being laid in electronic product or on relative two sides of the electronic product that is placed in, then probably there will be the problem of false triggering.Given this, the present embodiment is for the electronic product being only provided with two reset keys S4, S5, as shown in Figure 7, on adjacent two sides preferably reset key S4, the S5 described in two is placed on the housing of electronic product, such as be placed in the upper side edge of electronic product and right edge, because user is when handheld electric products carries out normal running, the probability that two hands grip the upside of electronic product and right side is simultaneously almost nil, therefore, the odds that by mistake resets can greatly be reduced.
For the electronic product being provided with more than three or three reset keys, because the quantity of reset key is more, even if user's handheld electric products, the probability simultaneously pressing all reset keys is inadvertently also very little, therefore, user performs the consideration of reset operation for convenience, the present embodiment preferably N number of reset key is placed in electronic product housing on relative two sides so that user's manipulation.As Fig. 8 is provided with the situation of three reset keys S1, S2, S3, can one of them reset key S1 be laid on the limit, left side of electronic product; Two other reset key S2, S3 are laid in the right edge of electronic product, and one upper, one under, user only need can press whole reset key S1, S2, S3 by the both hands of oneself simultaneously, completes reset operation.
Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned citing, the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (10)
1. a key reset circuit more than, is characterized in that: be provided with N number of reset key, N number of current-limiting resistance and N number of diode, described N be greater than 1 positive integer; Described N number of reset key is connected with N number of current-limiting resistance one_to_one corresponding, and form N bar series arm, described N bar series arm is connected between power supply and ground wire; The anode of N number of diode is connected to the intermediate node of reset key and current-limiting resistance in N bar series arm correspondingly, and the negative electrode of N number of diode connects reset signal output terminal.
2. many key reset circuit according to claim 1, is characterized in that: described current-limiting resistance is connected between described power supply and reset key, and described reset key is connected between current-limiting resistance and ground wire; Described reset key is that non-self-lock-ing often opens button, the reset signal Low level effective exported by described reset signal output terminal.
3. many key reset circuit according to claim 1, is characterized in that: described reset key is connected between described power supply and current-limiting resistance, and described current-limiting resistance is connected between reset key and ground wire; Described reset key is the normally closed button of non-self-lock-ing, the reset signal Low level effective exported by described reset signal output terminal.
4. many key reset circuit according to claim 1, is characterized in that: described reset signal output terminal is by filter capacitor ground connection.
5. many key reset circuit according to claim 1, is characterized in that: described N number of reset key is the mechanical key of same model, and described N number of current-limiting resistance is the resistive element of similar resistance, and described N number of diode is the switching diode of same model.
6. many key reset circuit according to any one of claim 1 to 5, is characterized in that: described reset signal output terminal connects the reset pin of a control module, export reset signal to described control module.
7. there is an electronic product for reset key, it is characterized in that: be provided with the many key reset circuit according to any one of claim 1 to 6.
8. the electronic product with reset key according to claim 7, is characterized in that: described N=2, the reset key described in two be placed in electronic product housing on adjacent two sides.
9. the electronic product with reset key according to claim 7, is characterized in that: as described N>2, described N number of reset key be placed in electronic product housing on relative two sides.
10. the electronic product with reset key according to any one of claim 7 to 9, it is characterized in that: described electronic product is portable type electronic product, described power supply is the direct supply that the battery in electronic product exports or the direct supply conversion generation exported battery via the power circuit in electronic product.
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| CN201511002172.3A CN105425927B (en) | 2015-12-29 | 2015-12-29 | More key reset circuits and electronic product with reset key |
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| CN201511002172.3A CN105425927B (en) | 2015-12-29 | 2015-12-29 | More key reset circuits and electronic product with reset key |
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| CN105425927B CN105425927B (en) | 2019-03-12 |
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| CN108491115A (en) * | 2018-03-13 | 2018-09-04 | 青岛海尔洗衣机有限公司 | Household appliance control method and household electrical appliance |
| CN110034752A (en) * | 2019-05-05 | 2019-07-19 | 厦门美图之家科技有限公司 | Face cleaning instrument and face cleaning instrument control method |
| CN118034472A (en) * | 2024-04-12 | 2024-05-14 | 深圳市南方智控科技有限公司 | Multi-key reset circuit |
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