Utility model content
The technical problems to be solved in the utility model be because of shutdown or standby time the control system still charged and extra electric quantity consumption that causes.
According to the utility model on the one hand, propose a kind of power control circuit, comprise switching circuit, key circuit and latching circuit, wherein:
Described switching circuit is connected with power supply, key circuit, latching circuit and control system respectively;
Described key circuit is connected with described control system;
Described latching circuit is connected with described control system;
Wherein, during work, described key circuit conducting, trigger described switching circuit conducting, described power supply is powered to described control system, and described control system detects described key circuit conducting, by described latching circuit conducting, to keep described switching circuit conducting;
Standby or shutdown time, described control system detects described key circuit conducting, trigger described latching circuit remove self-locking; Described key circuit becomes shutoff from conducting, and described switching circuit can not conducting, and the described power supply be connected with described switching circuit stops powering to described control system.
Further, described latching circuit comprises NPN type triode (Q2), the second resistance (R2), the 3rd resistance (R3) and the 4th resistance (R4), wherein:
One end of described 3rd resistance (R3) and described 4th resistance (R4) is connected to the base stage of NPN type triode (Q2), the other end of described 4th resistance (R4) is connected to ground, the other end of described 3rd resistance (R3) is connected to the driving I/O port of described control system master control IC, described second resistance (R2) is connected to the collector electrode of described triode (Q2), the grounded emitter of described triode (Q2), the other end of described second resistance (R2) connects described electronic switch, to realize the connection of described switching circuit and described latching circuit.
Further, described switching circuit comprises voltage stabilizing didoe (ZD1), the first resistance (R1) and electronic switch (Q1), wherein:
The source S of electronic switch (Q1) is connected with power supply input, voltage stabilizing didoe (ZD1) and the first resistance (R1) are connected in parallel on grid G and the source S of electronic switch (Q1), form the drive circuit of electronic switch (Q1), the drain D of electronic switch (Q1) connects described control system power input VCC, and the grid G of electronic switch (Q1) connects the other end of described second resistance (R2).
Further, described key circuit comprises diode (D1), button (S1) and electric capacity (C1), wherein:
The anode of described diode (D1) connects the collector electrode of described triode (Q2), receive the I/O port of described control system master control IC after the negative electrode of described diode (D1) is connected with one end of electric capacity (C1), one end of button (S1) respectively, the other end of the other end of described electric capacity (C1), described button (S1) is connected to ground.
Further, described button (S1) is touch key.
Further, described power supply is direct voltage input or battery.
According to the utility model on the other hand, also propose a kind of electric equipment, comprise above-mentioned arbitrary described power control circuit and control system.
In the utility model, control system standby or shutdown time power supply cut off completely, eliminate unnecessary electric quantity consumption, more energy-conservation.
In addition, in powered battery situation, the useful life of service time of battery and battery can effectively be extended.
By referring to the detailed description of accompanying drawing to exemplary embodiment of the present utility model, further feature of the present utility model and advantage thereof will become clear.
Embodiment
Various exemplary embodiment of the present utility model is described in detail now with reference to accompanying drawing.It should be noted that: unless specifically stated otherwise, otherwise positioned opposite, the numerical expression of the parts of setting forth in these embodiments and step and numerical value do not limit scope of the present utility model.
Meanwhile, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not draw according to the proportionate relationship of reality.
Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the utility model and application or use.
May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in the appropriate case, described technology, method and apparatus should be regarded as a part of authorizing specification.
In all examples with discussing shown here, any occurrence should be construed as merely exemplary, instead of as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to be further discussed it in accompanying drawing subsequently.
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the utility model is further described.
Figure 1 shows that a kind of structural representation of embodiment of power control circuit.This power control circuit comprises switching circuit 110, key circuit 120 and latching circuit 130.For ease of illustrating, also show power supply 140 and control system 150 in the drawings.Wherein:
Described switching circuit 110 is connected with power supply 140, key circuit 120, latching circuit 130 and control system 150 respectively;
Described key circuit 120 is connected with described control system 150;
Described latching circuit 130 is connected with described control system 150;
Wherein, during work, the conducting of described key circuit 120, trigger the conducting of described switching circuit 110, described power supply 140 is powered to described control system 150, and described control system 150 detects the conducting of described key circuit 120, by the conducting of described latching circuit 130, to keep the conducting of described switching circuit 110.Such as, control system 150 exports high level to latching circuit 130, by latching circuit conducting.Control system mentioned here refers to the electric-control system of existing product, and its inside comprises other peripheral circuits such as master control IC.
Standby or shutdown time, described control system 150 detects the conducting of described key circuit 120, triggers described latching circuit 130 and removes self-locking (such as, to described latching circuit output low level); Described key circuit 120 becomes shutoff from conducting, and described switching circuit 110 can not conducting, and the described power supply 140 be connected with described switching circuit 110 stops powering to described control system 150.
In this embodiment, standby or shutdown time, power supply 140 stops powering to described control system 150, and therefore, the power supply of control system cuts off completely, eliminates unnecessary electric quantity consumption, more energy-conservation.
In addition, power control circuit structure simple, energy-efficient and control convenient.
In addition, in powered battery situation, the useful life of service time of battery and battery can effectively be extended.
Figure 2 shows that a kind of electrical block diagram of another embodiment of power control circuit.In the figure, the structural representation of switching circuit 110, key circuit 120 and latching circuit 130 is respectively illustrated.For ease of illustrating, in this figure, also show power supply (this power supply is direct voltage input Vin or battery BT1).It will be understood by those skilled in the art that here just for citing, should not be construed as restriction of the present utility model, corresponding variants and modifications can be carried out accordingly, within the protection range that all should cover this claim.
In embodiment of the present utility model, latching circuit comprises NPN type triode Q2, resistance R2, resistance R3 and resistance R4.Wherein:
One end of resistance R3, resistance R4 is connected to the base stage of NPN type triode Q2, the other end of resistance R4 is connected to ground, the other end of resistance R3 is connected to the driving I/O port of control system master control IC, resistance R2 is connected to the collector electrode of Q2, the grounded emitter of Q2, the other end of resistance R2 connects electronic switch, to realize the connection of switching circuit and latching circuit.
In embodiment of the present utility model, switching circuit comprises voltage stabilizing didoe ZD1, resistance R1 and electronic switch Q1, wherein:
The source S of electronic switch Q1 (PMOS) is connected with power supply input, voltage stabilizing didoe ZD1 and resistance R1 is connected in parallel on grid G and the source S of electronic switch Q1, form the drive circuit of electronic switch Q1, the drain D connection control system power input VCC of electronic switch Q1, the grid G of electronic switch (Q1) connects the other end of described second resistance (R2).
In embodiment of the present utility model, key circuit comprises diode D1, button S1 and filter capacitor C1.Wherein:
The collector electrode of the anode connecting triode Q2 of diode D1, receive the I/O port of control system master control IC after the negative electrode of diode D1 is connected with one end of electric capacity C1, one end of button S1 respectively, the other end of electric capacity C1, the other end of button S1 are connected to ground.
In one embodiment, described button S1 is touch key.Use convenient.
The utility model also proposes a kind of electric equipment, and this electric equipment comprises described power control circuit in above-mentioned any embodiment and control system.Wherein, power supply can be direct voltage input or battery.In this embodiment, standby or shutdown time, power supply stop power to described control system, therefore, the power supply of control system cuts off completely, eliminates unnecessary electric quantity consumption, more energy-conservation.
Below in conjunction with accompanying drawing, specific embodiment of the utility model is described.
Figure 3 shows that a kind of electrical block diagram of embodiment of electric equipment.In this embodiment, electric equipment comprises switching circuit, key circuit, latching circuit and control system.Wherein, control system comprises main control chip U1 and voltage stabilizing chip U2.Main control chip U1 is such as programmable universal MCU (microcontroller), and inside has program to carry out input and output control to used I/O port; Any MCU with universal I/O port controlling functions can be used as the main control chip U1 of control system.
Push button S1 time, diode D1 negative electrode receive ground, power supply by resistance R1, resistance R2, diode D1 and button S1 formed conducting loop, its conducting schematic diagram, that is, when button is pressed, current direction figure is as shown in Figure 4.Now the grid of electronic switch Q1 and voltage between source electrodes meet turn-on condition, source electrode and the drain electrode conducting of electronic switch Q1, power supply is powered to VCC to control system with drain electrode by the source electrode of electronic switch Q1, and because after metal-oxide-semiconductor conducting, pressure drop is very low, VCC is approximately equal to supply voltage.
VCC is by voltage stabilizing chip U2 output voltage, and such as, 5V voltage, powers to main control chip U1, main control chip U1 obtain electric after start working, now button S1 presses and does not also have enough time to unclamp; Because main control chip U1 internal processes constantly to detect the state of button S1 by I/O port A1, now detect that button S1 presses, be judged as boot action, I/O port A2 exports high level, makes triode Q2 conducting by resistance R3, power supply forms loop by resistance R1, resistance R2, triode Q2, no longer flow through diode D1 and button S1, even if now button S1 unclamps, electronic switch Q1 is also in conducting state, system worked well, namely forms self-locking.Be illustrated in figure 5 button and unclamp after-current flow graph.
Standby or shutdown time, push button S1, and main control chip U1 detects that button S1 presses, I/O port A2 output low level, and triode Q2 disconnects, latching circuit releasing self-locking, now current direction is got back to again shown in Fig. 4; After button S1 unclamps, the grid return of electronic switch Q1 disconnects, can not normally, and source electrode is disconnected with drain electrode, and VCC can not obtain electric, i.e. power supply disconnection, whole control system power-off.
In this embodiment, controlled the closed and disconnected of switching circuit on electric power loop by key circuit and latching circuit, thus realize unlatching and the connection of power supply, can power-off completely when making standby or shutdown, electric quantity consumption when saving standby.
So far, the utility model is described in detail.In order to avoid covering design of the present utility model, details more known in the field are not described.Those skilled in the art, according to description above, can understand how to implement technical scheme disclosed herein completely.
Although be described in detail specific embodiments more of the present utility model by example, it should be appreciated by those skilled in the art, above example is only to be described, instead of in order to limit scope of the present utility model.It should be appreciated by those skilled in the art, when not departing from scope and spirit of the present utility model, above embodiment can be modified.Scope of the present utility model is limited by claims.