CN104104371A - Electronic product switching circuit - Google Patents
Electronic product switching circuit Download PDFInfo
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- CN104104371A CN104104371A CN201410296049.6A CN201410296049A CN104104371A CN 104104371 A CN104104371 A CN 104104371A CN 201410296049 A CN201410296049 A CN 201410296049A CN 104104371 A CN104104371 A CN 104104371A
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Abstract
The invention discloses an electronic product switching circuit comprising a button switch. The input end of the button switch is connected with the high-level output end of a battery. One path of the output end of the button switch is connected with the power supply detection end of an electronic product system circuit via a first voltage-dividing circuit, and the other path is connected with a second voltage-dividing circuit and then grounded via connection with a reset circuit. One path of the power supply control end of the electronic product system circuit is connected with the reset circuit and then grounded, and the other path is connected with the input end of a first-stage switching circuit. The switching circuit also comprises a second-stage switching circuit. The input end of the second-stage switching circuit is connected with the high-level output end of the battery, the output end is connected with the power supply input end of the electronic product system circuit and the control end is connected with the output end of the first-stage switching circuit. Power-off power consumption is greatly reduced by the switching circuit, use of the battery is reduced and power supply time of the battery is prolonged under that situation of the same electric quantity.
Description
Technical field
The present invention relates to a kind of switching circuit of electronic product.
Background technology
The on/off circuit of existing electronic product, in the time of shutdown, it is not in fact completely by system and dump, but make MCU in low power consumpting state, in the time of start, need the long starting key of pressing, make system recover normal power supply operating state, mainly there is at present following technical problem in the circuit of this structure: while 1, shutdown, though system is in low power consumpting state, but with completely by system compared with dump, still there is certain power consumption, in the situation that battery electric quantity is the same, the corresponding shortening of battery-powered time.2, current switching circuit does not generally have reset function, or the switching circuit with reset function need to separately be established reset key, compared with only having a button, reset key is set in addition need to take more space separately, runs counter to the designer trends of current miniaturization of electronic products.
Based on this, how to invent a kind of switching circuit, can in the time of shutdown, system and power supply be disconnected completely, maximized reduction shutdown power consumption, extends battery time, is the technical problem that the present invention mainly solves.
Summary of the invention
The present invention does not disconnect system and power supply completely in order to solve existing switching circuit, still has the technical problem of power consumption, and a kind of switching circuit is provided, and can in the time of system closedown, system and power supply be disconnected completely.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of switching circuit of electronic product, comprise key switch, the input of described key switch connects the high level output end of battery, the output of described key switch is wherein leaded up to the first bleeder circuit and is connected with the power supply test side of described electronic product system circuit, reset circuit ground connection is passed through to connect after connecting the second bleeder circuit in an other road, the power control terminal of a described electronic product system circuit wherein road is connected rear ground connection with described reset circuit, an other road is connected with the input of first order switching circuit, when the power control terminal of described electronic product system circuit is exported high level, the conducting of described first order switching circuit, described switching circuit also comprises second level switching circuit, the input of described second level switching circuit is connected with the high level output end of battery, the output of described second level switching circuit connects the power input of described electronic product system circuit, the control end of described second level switching circuit is connected with the output of described first order switching circuit.
Further, the first described bleeder circuit comprises the 4th resistance (R4).
Further again, the 4th described resistance (R4) is also in series with the first diode (D1), and the anode of described the first diode (D1) is connected with the 4th resistance (R4), and negative electrode is connected with the power supply test side of described electronic product system circuit.
Further, between the power control terminal of described electronic product system circuit and the input of first order switching circuit, be also in series with the first resistance (R1).
Further again, the second described bleeder circuit comprises the second resistance (R2), and described the second resistance (R2) is also in series with a light-emitting diode.
Further, described the second resistance (R2) is also parallel with the 4th electric capacity (C4).
Further, described reset circuit comprises the 6th resistance (R6) and the delay capacitor (C2) that are in parallel.
Further, described second level switching circuit is PMOS pipe, the source electrode of described PMOS pipe is connected with the high level output end of battery, drain electrode be connected with the power input of described electronic product system circuit, grid be connected with the output of described first order switching circuit.
Further, described first order switching circuit is NPN type triode, and the base stage of described NPN type triode is connected with the power control terminal of described electronic product system circuit, and emitter connects earth terminal, and collector electrode is connected with the grid of described PMOS pipe.
Further, described first order switching circuit is NMOS pipe, and the grid of described NMOS pipe is connected with the power control terminal of described electronic product system circuit, and the source electrode of described NMOS pipe connects earth terminal, and the drain electrode of described NMOS pipe is connected with the grid of described PMOS pipe.
Compared with prior art, advantage of the present invention and good effect are: switching circuit of the present invention, when system power supply is turn-offed, switch pushes button, the power supply test side of described electronic product system circuit detects high level signal, the power control terminal output low level signal of corresponding described electronic product system circuit, and then first order switching circuit disconnects, further cause again second level switching circuit to disconnect, therefore, having cut off battery is the power input supply access of described electronic product system circuit, realize in the time of system closedown system and power supply have been disconnected completely.Circuit structure of the present invention is simple, says that the electronic device cost adopting is lower, can not bring larger hardware cost to product, but, adopt this switching circuit can greatly reduce shutdown power consumption, reduce the use of battery, the power-on time that extends battery in same electric weight situation.
Read by reference to the accompanying drawings after the detailed description of embodiment of the present invention, it is clearer that the other features and advantages of the invention will become.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit block diagram in switching circuit embodiment mono-proposed by the invention;
Fig. 2 is the circuit theory diagrams in switching circuit embodiment bis-proposed by the invention;
Fig. 3 is the circuit theory diagrams in switching circuit embodiment tri-proposed by the invention;
Fig. 4 is the circuit theory diagrams in switching circuit embodiment tetra-proposed by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment mono-, the present embodiment provides a kind of switching circuit, as shown in Figure 1, comprise key switch SWITCH, the input of described key switch SWITCH connects the high level output end of battery BATT, the output of described key switch SWITCH is wherein leaded up to the first bleeder circuit and is connected with the power supply test side MCU_SW_DET of the control chip MCU of described electronic product system circuit, an other road connects after the second bleeder circuit by connecting ground connection after reset circuit, the power control terminal MCU_POWER of a described MCU wherein road is connected rear ground connection with described reset circuit, an other road is connected with the input of first order switching circuit K1, when the power control terminal MCU_POWER of described MCU exports high level, described first order switching circuit K1 conducting, described switching circuit also comprises second level switching circuit K2, the input a of described second level switching circuit K2 is connected with the high level output end of battery BATT, the output b of described second level switching circuit K2 connects the power input POWER of described electronic product system circuit, also be that battery BATT is described electronic product system power supply by second level switching circuit K2, the control end c of described second level switching circuit K2 is connected with the output of described first order switching circuit K1.
Wherein, the model of control chip MCU can be STM32F107RB, the common I/O pin (GPIO pin) that its power supply test side MCU_SW_DET is this chip, its function is the level signal for receiving the first bleeder circuit, power control terminal MCU_POWER is similarly a common I/O pin (GPIO pin) of this chip, and its function is for exporting low and high level signal to first order switching circuit K1.
The operation principle of this switching circuit is: under off-mode, in the time pushing button SWITCH, the power supply test side MCU_SW_DET of described MCU detects high level, the other road of output of button SWITCH connects after the second bleeder circuit the current circuit conducting by connecting ground connection after reset circuit, the input of first order switching circuit K1 is high level, therefore first order switching circuit K1 conducting, when first order switching circuit K1 conducting, the output of first order switching circuit K1 is to the control end c output low level signal of second level switching circuit K2, second level switching circuit K2 conducting, therefore battery BATT starts to provide operating voltage for described electronic product system circuit, system starts, realize start, now power control terminal MCU_POWER is output as high level, make first order switching circuit K1 keep conducting state, even when button is upspring, also can make battery to electronic product system normal power supply.
Under open state time, in the time pushing button SWITCH, the power supply test side MCU_SW_DET of described MCU detects as high level, now power control terminal MCU_POWER is output as low level, now the input of first order switching circuit K1 is low level, K1 cut-off, when first order switching circuit K1 cut-off, the output of first order switching circuit K1 is to the control end c output high level signal of second level switching circuit K2, second level switching circuit K2 also ends, therefore battery BATT disconnects the path that operating voltage is provided to described electronic product system circuit, system power failure, realize shutdown.When shutdown, described power input POWER completely with battery BATT disconnection, therefore there is not power consumption.
In addition, this switching circuit also has reset function, under open state, in the time of long button SWITCH, power supply test side MCU_SW_DET detects lasting high level, power control terminal MCU_POWER is first output as low level, the input level of first order switching circuit K1 is dragged down, and system power failure shutdown, because being grows by button SWITCH, the level that the input of first order switching circuit K1 is exported by battery BATT is subsequently set to high level, system is started and reset.
Embodiment bis-; the present embodiment provides a kind of particular circuit configurations of switching circuit; as shown in Figure 2; in the present embodiment, the first described bleeder circuit comprises that the 4th resistance R 4, the four resistance R 4 are for the protection of MCU; prevent that its power supply test side MCU_SW_DET is subject to the impact of high level; therefore, the resistance of the 4th resistance R 4 should arrange larger, preferably adopts in the present embodiment the resistance of 10k resistance.
In order to prevent that the electric current in MCU from pouring in down a chimney to switching circuit, the 4th described resistance R 4 is also in series with the first diode D1, the anode of described the first diode D1 is connected with the 4th resistance R 4, negative electrode is connected with described power supply test side MCU_SW_DET, realizes the one-way conduction of the power supply test side MCU_SW_DET of electric current from battery BATT to described MCU.
As a same reason, the second described bleeder circuit can adopt the second resistance R 2 to realize, its in switching circuit to act on the first bleeder circuit similar, and both resistances are also close.
For the action of pressing of convenient prompting button SWITCH, the second described resistance R 2 is also in series with a LED, no matter that start, shutdown or reset operation are while pushing button SWITCH, the equal conducting in loop that battery BATT extremely holds through the second bleeder circuit, reset circuit, therefore LED is lighted.
In order to remove signal jitter, improve the anti-noise ability of switch, prevent that button SWITCH from being push once touching by circuit judges a little, the second described resistance R 2 is also parallel with the 4th capacitor C 4, can filter out noise signal.
As a preferred embodiment, described second level switching circuit K2 preferably adopts a PMOS pipe to realize, the described PMOS pipe source electrode of Q1 and the high level output end of battery BATT are connected, drain electrode is connected with the power input POWER of described electronic product system circuit, grid is control signal input, is connected with the output of described first order switching circuit K1.The conducting in the time of the output output low level of first order switching circuit K1 of described PMOS pipe, therefore battery BATT is described electronic product system circuit supply by this PMOS pipe, system boot starts, PMOS pipe Q1 ends in the time of the output output high level of first order switching circuit K1, therefore battery BATT is broken as described electronic product system circuit supply, system closedown, adopt the advantage of PMOS pipe to be that its pressure drop is less, loss on the one hand can reduce battery and be described electronic product system circuit supply time, it is full there will not be original battery on the one hand in addition, if after a larger pressure drop, system shows that amount of batteries is low, situation about not being inconsistent with actual conditions.
Described first order switching circuit K1 can adopt a NPN type triode to realize, as shown in Figure 2, the base stage of described NPN type triode Q2 is connected with the power control terminal MCU_POWER of described MCU, and emitter connects earth terminal, and collector electrode is connected with the grid of described PMOS pipe Q1.Accordingly, the base stage of NPN type triode Q2 is input, in the time that its input is low level, and NPN type triode Q2 cut-off, otherwise, conducting.Very output of its current collection, the level state of its collector electrode is for controlling the conducting state of described PMOS pipe Q1.
As shown in Figure 2, described reset circuit comprises the 6th resistance R 6 and the delay capacitor C2 that are in parallel, and its operation principle is: when circuit has reset function, in the time pressing (such as setting is greater than 2s) by bond distance, the base stage of NPN type triode Q2 is low level, this triode Q2 cut-off, system closedown, subsequently because button continues to press, system is started shooting again, thereby has reached the effect resetting, and C2 is delay capacitor, be used in conjunction with R6, reach the object of time-delay reset.
As the alternate embodiments of the first switching circuit, described first order switching circuit K1 can also adopt a NMOS pipe to realize, in the time adopting NMOS pipe, the grid of described NMOS pipe is connected with the power control terminal MCU_POWER of described MCU, the source electrode of described NMOS pipe connects earth terminal, the drain electrode of described NMOS pipe is connected with the grid of described PMOS pipe Q1, and because above-mentioned explanation can clearly be expressed, its particular circuit configurations is not shown in the present embodiment.
Embodiment tri-, the present embodiment has provided a kind of switching circuit without reset function, as shown in Figure 3, between described power control terminal MCU_POWER and the input of first order switching circuit, be also in series with the first resistance R 1, the operation principle of this circuit is: owing to increasing by the first resistance R 1, therefore, in the time that button SWITCH presses, the base stage of the uncontrollable NPN type of described power control terminal MCU_POWER triode Q2 is in low level, it is triode Q2 cut-off state, therefore the object of reset cannot be realized, general on/off circuit can only be served as.The switching circuit of this structure, for user provides many a kind of selections, in the time that actual electronic product does not need reset function, can adopt the switching circuit of this structure.
Embodiment tetra-, the present embodiment has provided a kind of circuit that is simultaneously reserved with reset function interface and non-reset function interface, as shown in Figure 4, the control chip MCU of wherein said electronic product system circuit comprises two power control terminal MCU_POWER1 and MCU_POWER2, the first resistance R 1 can arrange according to actual needs, the switching circuit of this structure is convenient to uniform specification, because be reserved with two interfaces, in the time being applied to electronic product, can build circuit according to the actual needs of this electronic product, such as, in the time that needs have reset function, MCU_POWER1 is unsettled, the first resistance R 1 also need not be set, in the time not needing reset function is set, MCU_POWER2 is unsettled, now MCU_POWER1 is connected with the base stage of NPN type triode Q2 by the first resistance R 1.The circuit setting of this structure is more flexible, is convenient to batch production.
Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art make in essential scope of the present invention, also should belong to protection scope of the present invention.
Claims (10)
1. the switching circuit of an electronic product, comprise key switch, the input of described key switch connects the high level output end of battery, it is characterized in that: the output of described key switch is wherein leaded up to the first bleeder circuit and is connected with the power supply test side of described electronic product system circuit, reset circuit ground connection is passed through to connect after connecting the second bleeder circuit in an other road, the power control terminal of a described electronic product system circuit wherein road is connected rear ground connection with described reset circuit, an other road is connected with the input of first order switching circuit, when described power control terminal output high level, the conducting of described first order switching circuit, described switching circuit also comprises second level switching circuit, the input of described second level switching circuit is connected with the high level output end of battery, the output of described second level switching circuit connects the power input of described electronic product system circuit, the control end of described second level switching circuit is connected with the output of described first order switching circuit.
2. switching circuit according to claim 1, is characterized in that: the first described bleeder circuit comprises the 4th resistance (R4).
3. switching circuit according to claim 2, it is characterized in that: the 4th described resistance (R4) is also in series with the first diode (D1), the anode of described the first diode (D1) is connected with the 4th resistance (R4), and negative electrode is connected with described power supply test side.
4. switching circuit according to claim 1, is characterized in that: between described power control terminal and the input of first order switching circuit, be also in series with the first resistance (R1).
5. switching circuit according to claim 1, is characterized in that: the second described bleeder circuit comprises the second resistance (R2), and described the second resistance (R2) is also in series with a light-emitting diode.
6. switching circuit according to claim 5, is characterized in that: described the second resistance (R2) is also parallel with the 4th electric capacity (C4).
7. switching circuit according to claim 1, is characterized in that: described reset circuit comprises the 6th resistance (R6) and the delay capacitor (C2) that are in parallel.
8. according to the switching circuit described in claim 1-7 any one, it is characterized in that: described second level switching circuit is PMOS pipe, the source electrode of described PMOS pipe is connected with the high level output end of battery, drain electrode is connected with described power input, and grid is connected with the output of described first order switching circuit.
9. switching circuit according to claim 8, it is characterized in that: described first order switching circuit is NPN type triode, the base stage of described NPN type triode is connected with described power control terminal, and emitter connects earth terminal, and collector electrode is connected with the grid of described PMOS pipe.
10. switching circuit according to claim 8, it is characterized in that: described first order switching circuit is NMOS pipe, the grid of described NMOS pipe is connected with described power control terminal, and the source electrode of described NMOS pipe connects earth terminal, and the drain electrode of described NMOS pipe is connected with the grid of described PMOS pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410296049.6A CN104104371A (en) | 2014-06-27 | 2014-06-27 | Electronic product switching circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410296049.6A CN104104371A (en) | 2014-06-27 | 2014-06-27 | Electronic product switching circuit |
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| CN104104371A true CN104104371A (en) | 2014-10-15 |
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Cited By (2)
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| CN104407687A (en) * | 2014-12-09 | 2015-03-11 | 青岛歌尔声学科技有限公司 | Reset circuit |
| CN112994670A (en) * | 2021-05-08 | 2021-06-18 | 杭州米芯微电子有限公司 | Low-shutdown-power-consumption circuit of SOC (System on chip) and SOC |
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| CN112994670A (en) * | 2021-05-08 | 2021-06-18 | 杭州米芯微电子有限公司 | Low-shutdown-power-consumption circuit of SOC (System on chip) and SOC |
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Application publication date: 20141015 |