Utility model content
For the deficiencies in the prior art, the purpose of this utility model is to provide a kind of wake-up circuit of more low-power consumption.
The technical scheme that the utility model adopted is for achieving the above object:
Utilize the charge and discharge state of three-terminal switch switch capacitor, the electric weight during by capacitor discharge drives the switch enable end of controlled circuit, thereby controls the on off state of controlled circuit.
Based on above technical scheme, the beneficial effects of the utility model and advantage:
1. the utility model enforcement is simpler, only can realize by a three-terminal switch, a capacitor and a resistor.
2. the utility model cost is lower.
3. the utility model can provide the power supply arousal function of more low-power consumption.
Brief description of the drawings
Fig. 1 is embodiment 1 circuit connection diagram of the present utility model;
Fig. 2 is embodiment 2 circuit connection diagrams of the present utility model.
Wherein, 1 is three-terminal switch, and 2 is controller, and 3 is capacitor, and 4 is power supply, and 5 is field effect transistor, and 6 is resistor, and 7 is power supply chip.
Embodiment
Below in conjunction with drawings and Examples, this patent is described further.
Low-power consumption wake-up circuit is made up of capacitor 3, three-terminal switch 1 and resistor 6, capacitor 3 one end connect the negative pole end of power supply, capacitor 3 other ends are connected with the first pin of three-terminal switch 1, the second pin of three-terminal switch 1 is connected with the positive terminal of power supply, resistor 6 one end connect the negative pole end of power supply, the other end connects the 3rd pin of three-terminal switch 1, connects controlled circuit Enable Pin simultaneously.
In the time of the first pin of three-terminal switch 1 and the second pin conducting, power supply is capacitor charging via three-terminal switch 1, after capacitor 3 is full of, no longer includes current drain.In the time of the first pin of three-terminal switch 1 and the 3rd pin conducting, electric energy in capacitor 3 is the power supply of controlled circuit Enable Pin by three-terminal switch 1, discharge for capacitor 3 by resistor 6 simultaneously, by selecting the capacitance of capacitor 3 and the resistance value of resistor 6, near and provide the power supply of fixed time for controlled circuit.
Described three-terminal switch 1 is gravity control switch or soft-touch control.
Provide the power supply of certain hour by switching ground three pins that the switch direction of three-terminal switch 1 makes three-terminal switch for controlled circuit.
Embodiment 1 as shown in Figure 1, controlled circuit uses N channel field-effect pipe 5 as power control switch, wherein grid G connects 3 pin of three-terminal switch, source S contact resistance device 6, drain D connects controller 2, the I/O interface of controller connects 3 pin of three-terminal switch, and the other end of controller 2 connects the positive terminal of power supply 4.When capacitor 3 is given the G utmost point (grid) power supply of field effect transistor by three-terminal switch 1, the field effect transistor D utmost point (drain electrode) and the S utmost point (source electrode) conducting, for controller 2 is powered, after controller 2 work, can the field effect transistor G utmost point (grid) be drawn high and keep power supply always in conducting state by I/O interface, in the time that needs disconnect power supply, the I/O interface cancellation of controller 2 is drawn high, in the time of the first pin of three-terminal switch 1 and the second pin conducting, field effect transistor 5 is cut-off at once, in the time of the first pin of three-terminal switch 1 and the 3rd pin conducting, field effect transistor 5 meetings power cutoff in the time that electric capacity electrical equipment drops to its cut-ff voltage by resistance step-down.
As shown in Figure 2, controlled circuit uses the power supply chip 7 with all-round pin, V in figure to embodiment 2
dDfor power input, GND is for publicly, V
oUTfor the power output end of power supply chip, the enable pin V of power supply chip 7
eNpin connects the 3rd pin of three-terminal switch 1, and the output of power supply chip 7 connects controller 2, and the I/O interface of controller 2 connects the 3rd pin of three-terminal switch 1.Capacitor 3 is given power supply chip 7 enable pin V by three-terminal switch 1
eNpin power supply, power supply chip 7 conductings are that controller 2 is powered, can be by I/O interface by power supply chip V after controller 2 work
eNpin is drawn high, keep power supply always in conducting state, in the time that needs disconnect power supply, the I/O interface cancellation of controller 2 is drawn high, power supply chip 7 cut-off at once in the time of the first pin of three-terminal switch and the second pin conducting, in the time of three-terminal switch the first pin and the 3rd pin conducting, power supply chip 7 meetings power cutoff in the time that electric capacity electrical equipment drops to its cut-ff voltage by resistance step-down.