CN101588065A - A kind of wireless commerical power management circuit - Google Patents
A kind of wireless commerical power management circuit Download PDFInfo
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- CN101588065A CN101588065A CNA2009101120565A CN200910112056A CN101588065A CN 101588065 A CN101588065 A CN 101588065A CN A2009101120565 A CNA2009101120565 A CN A2009101120565A CN 200910112056 A CN200910112056 A CN 200910112056A CN 101588065 A CN101588065 A CN 101588065A
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Abstract
The invention discloses a kind of wireless commerical power management circuit, it comprises a communication module, a battery, an external interface circuit, dispatch from foreign news agency power supply circuits, a charging control circuit and a power supply commutation circuit.This power supply commutation circuit comprises a metal-oxide-semiconductor and a protective circuit.This metal-oxide-semiconductor drain electrode electricity connects battery, and the source electrode electricity connects switching circuit, make when external power supply is arranged metal-oxide-semiconductor by and provide electric energy by external power supply for communication module, metal-oxide-semiconductor conducting and provide electric energy for communication module when no external power supply by battery.This protective circuit electricity connects external interface circuit, battery and dispatch from foreign news agency power supply circuits, and when being used for outside dump, making the metal-oxide-semiconductor grid voltage is low level, makes between metal-oxide-semiconductor source electrode and the grid and has voltage difference, makes metal-oxide-semiconductor be in conducting state.
Description
Affiliated technical field
The present invention relates to a kind of wireless commerical power management circuit.
Background technology
In the conventional wireless commerical power management circuit, communication module all is battery-powered.When electricity connect external power, external power can not be directly used in to the communication module power supply, can only be used to battery charge.This circuit has following deficiency: can't satisfy the demand that outer Electric adapter and internal battery all can be powered separately.
At above-mentioned deficiency, the someone proposes a solution, as shown in Figures 1 and 2.This electric power management circuit, it comprises a communication module, a battery, an external interface circuit, dispatch from foreign news agency power supply circuits, a charging control circuit and a power supply commutation circuit.This external interface circuit is used for electricity and connects external power.These dispatch from foreign news agency power supply circuits are used for electricity and are connected between external interface circuit and the communication module, and to allow the external power supply be that communication module provides power supply, it comprises a pressure limiting circuit and a switching circuit.This charging control circuit is used for electricity and is connected between external interface circuit and the battery, to allow the external power supply be battery charge.This power supply commutation circuit utilizes the characteristic of diode to realize switching, and is used for providing electric energy by external power supply for communication module when external power supply is arranged, and provides electric energy by battery for communication module when no external power supply.This circuit working principle: when having dispatch from foreign news agency (4.6V) to insert, one tunnel process pressure limiting circuit (D2, D3, D4, D5), switching circuit are powered to communication module.The R1 of this external interface circuit and R2 have certain dividing potential drop (POWER of communication module detects mouth and is connected between R1 and the R2), and when electricity connect external power, this POWER detected mouth and has voltage, and communication module has been judged external power according to this voltage.Communication module judges whether cell voltage will start charging mechanism again, if confirm to start fast electricity, provides control voltage by communication module PWM mouth to Q2, and the output high level makes the Q2 conducting, makes the Q1 conducting; At this moment another road of dispatch from foreign news agency charges the battery through R5, Q1, realizes charging control by communication module.The charging stop condition judges that by communication module cell voltage and battery temperature determine whether stopping charging.When external power cuts off (no dispatch from foreign news agency), power to communication module through D6, D7, SW1 by battery.R6 introduces from pressure limiting circuit and charges the battery, and mainly is to fill use as Ni-MH battery trickle electricity, selects R6 whether to use the charging mechanism that depends on communication module.This solution has following deficiency: battery is to having string that diode D6 is arranged in the communication module power supply, D7, the pressure reduction of Schottky diode is 0.3V, the communication module normal working voltage of existing market is that (be lower than the 3.3V power supply cause for the operation of communication module built-in system stability to make mistakes 3.3V-4.3V, if for fear of similar problem, communication module software is mentioned 3.3V to soft-off voltage), therefore when cell output voltage is between 3.3V-3.6V, (pass through after the 0.3V pressure drop, be lower than 3.3V), communication module will Control Software be shut down, the electric energy of cell output voltage between 3.3-3.6V not discharge finished, battery can't rationally discharge and finish, and to using battery capacity certain loss is arranged.
At the existing deficiency of this solution, the someone proposes solution, as shown in Figure 3.It and a last solution difference are: increase R3, R7, D10 Primary Component, replaced D6, the D7 of Fig. 2 by MOS1.This circuit working principle: charging principle, dispatch from foreign news agency power supply the principle are the same with Fig. 2; Difference is: make metal-oxide-semiconductor into by Schottky diode when the dispatch from foreign news agency power supply switches to the internal battery power supply, this metal-oxide-semiconductor adopts AO3401 (P type insulation field effect transistor), the metal-oxide-semiconductor grid passes through grounding through resistance, pass through diode (IN4148) to grid by power supply, drain electrode connects battery-end, and source electrode outputs to switch.When external power supply was arranged, dispatch from foreign news agency was drawn high the mos gate pole tension by D10, made metal-oxide-semiconductor be in cut-off state.To communication module powered through D2, D3, D4, D5, switching circuit by dispatch from foreign news agency this moment.When not having external power supply, the grid of metal-oxide-semiconductor is in low level, the MOS conducting, and give module for power supply source by internal battery this moment.This electric power management circuit has following deficiency: 1, when communication module control charging, at this moment disconnect dispatch from foreign news agency, and the communication module reaction speed is not closed charging mechanism so soon, cause battery to leak electricity to outer electrical interface from Q1, make the grid of metal-oxide-semiconductor handle high level state, metal-oxide-semiconductor ends, and this moment, battery can only be powered to communication module by the metal-oxide-semiconductor internal body diodes, the internal body diodes pressure reduction of MOS is 0.7V, so this moment, battery caused bigger ripple to communication module; When 2, cell voltage was in normal condition, its output voltage was when 3.3V-4.0V, but this output voltage is lower than 3.3V by after the 0.7V pressure drop, and communication module will Control Software be shut down, and causes abnormal shutdown, caused the battery capacity loss.
Summary of the invention
The invention provides a kind of wireless commerical power management circuit, it has overcome the existing deficiency of electric power management circuit of background technology.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of wireless commerical power management circuit, it comprises a communication module, a battery, an external interface circuit, dispatch from foreign news agency power supply circuits, a charging control circuit and a power supply commutation circuit;
This external interface circuit is used for electricity and connects external power;
These dispatch from foreign news agency power supply circuits are used for electricity and are connected between external interface circuit and the communication module, and to allow the external power supply be that communication module provides power supply, it comprises a pressure limiting circuit and a switching circuit;
This charging control circuit is used for electricity and is connected between external interface circuit and the battery, to allow the external power supply be battery charge;
This commutation circuit of powering, it comprises a metal-oxide-semiconductor, and this metal-oxide-semiconductor drain electrode electricity connects battery, and the source electrode electricity connects switching circuit, make when external power supply is arranged metal-oxide-semiconductor by and provide electric energy by external power supply for communication module, metal-oxide-semiconductor conducting and provide electric energy for communication module when no external power supply by battery;
This power supply commutation circuit also comprises a protective circuit; this protective circuit electricity connects external interface circuit, battery and dispatch from foreign news agency power supply circuits, and when being used for outside dump, making the metal-oxide-semiconductor grid voltage is low level; make between metal-oxide-semiconductor source electrode and the grid and have voltage difference, make metal-oxide-semiconductor be in conducting state.
In one preferred embodiment, this charging control circuit, it comprises:
One triode Q1, the E utmost point and the external interface circuit electricity of this triode Q1 connect, and the C utmost point and the battery electricity of triode Q1 connect; And
One triode Q2, the C utmost point of this triode Q2 and the B of triode Q1 extremely electricity connect, and the B utmost point and the communication module electricity of this triode Q2 connect, the E utmost point ground connection of this triode Q2;
Wherein: when external power supply was arranged, communication module provided control voltage to Q2, made the Q1 conducting, allowed external power supply charge the battery.
In one preferred embodiment, this protective circuit, it comprises:
One triode Q3, the B utmost point and the external interface circuit electricity of this triode Q3 connect, and the E utmost point and the battery electricity of this triode Q3 connect;
One triode Q4, the B utmost point of this triode Q4 and the C of triode Q3 extremely electricity connect, the E utmost point ground connection of this triode Q4, the C utmost point of this triode Q4 and the B of triode Q1 extremely electricity connect; And
One diode D10, the B of this diode D10 anode and triode Q3 extremely electricity connects, and this diode D10 cathodic electricity connects the metal-oxide-semiconductor grid;
Wherein: this metal-oxide-semiconductor grid is by resistance R 7 ground connection; When external power supply was arranged, this Q3 ended, and Q4 ends, and external power supply is drawn high the metal-oxide-semiconductor grid by D10, so that metal-oxide-semiconductor ends; When external dump, this Q3 conducting, the Q4 conducting, Q1 ends, and this Q1 is a low level by making the metal-oxide-semiconductor grid voltage, to guarantee the metal-oxide-semiconductor conducting.
In one preferred embodiment, the B utmost point of this triode Q3 connects external interface circuit by resistance R 4 electricity, and the C utmost point of this triode Q3 connects the B utmost point of triode Q4 by resistance R 9 electricity, and electricity is connected to resistance R 10 between the B utmost point of this triode Q4 and the E utmost point of triode Q4.
In one preferred embodiment, this protective circuit, it comprises:
One triode Q3, the B utmost point and the external interface circuit electricity of this triode Q3 connect, and the E utmost point and the battery electricity of this triode Q3 connect;
One triode Q4, the B utmost point of this triode Q4 and the C of triode Q3 extremely electricity connect, the E utmost point ground connection of this triode Q4, the C utmost point of this triode Q4 connects the metal-oxide-semiconductor grid by resistance R 13 electricity;
One resistance R 7, the B of these resistance R 7 one ends and triode Q3 extremely electricity connects, and the C of the other end and triode Q4 extremely electricity connects;
Wherein: when external power supply was arranged, this Q3 ended, and Q4 ends, and external power supply is drawn high the metal-oxide-semiconductor grid by R7, so that metal-oxide-semiconductor ends; When external dump, this Q3 conducting, it is low level that Q4 conducting, this Q4 conducting make the metal-oxide-semiconductor grid voltage, to guarantee the metal-oxide-semiconductor conducting.
In one preferred embodiment, the B utmost point of this triode Q3 connects external interface circuit by resistance R 4 electricity, and the C utmost point of this triode Q3 connects the B utmost point of triode Q4 by resistance R 9 electricity, and electricity is connected to resistance R 10 between the B utmost point of this triode Q4 and the E utmost point of triode Q4.
The technical program is compared with background technology: owing to be provided with protective circuit, the low-voltage characteristics of external interface circuit output when this protective circuit directly utilizes external power to cut off, making the metal-oxide-semiconductor grid voltage is low level, make between metal-oxide-semiconductor source electrode and the grid and have voltage difference, make metal-oxide-semiconductor be in conducting state, guarantee the switching of commutation circuit, therefore has following advantage: 1, avoid dispatch from foreign news agency and internal battery in switching, to produce and imitate big ripple, can realize the stability of dispatch from foreign news agency and internal battery switching controls; 2, this protective circuit only increases less device, and cost is low.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the circuit block diagram of background technology.
Fig. 2 is an available circuit figure of background technology.
Fig. 3 is another available circuit figure of background technology.
Fig. 4 is the circuit diagram of a preferred embodiment of the present invention.
Fig. 5 is the circuit diagram of another preferred embodiment of the present invention.
Embodiment
Please refer to Fig. 1 and Fig. 4, a kind of wireless commerical power management circuit, it comprises a communication module, a battery, an external interface circuit, dispatch from foreign news agency power supply circuits, a charging control circuit and a power supply commutation circuit.
This communication module has a VBAT interface, an ADC interface, a VADC interface, a PWM interface and a POWER interface.
This battery comprises a battery BT1, a thermistor, a resistance R 14, a resistance R 15, a capacitor C 2.The ADC interface of this thermistor and communication module is connected, to detect battery temperature.The tie point between this resistance R 14 and the resistance R 15 and the VADC interface of communication module are connected, to detect cell voltage.
This external interface circuit is used for electricity and connects external power, and it comprises outer electrical interface, a resistance R 1, a resistance R 2, a resistance R 3, a capacitor C 1, a diode D1.This resistance R 1 is connected with resistance R 2 and is used for dividing potential drop, and the POWER interface of this communication module is connected between resistance R 1 and the R2, is used to judge whether that electricity connects external power.
These dispatch from foreign news agency power supply circuits are used between the VBAT interface that electricity is connected on external interface circuit output and communication module, to allow the external power supply be that communication module provides power supply.These dispatch from foreign news agency power supply circuits comprise a pressure limiting circuit and a switching circuit.This pressure limiting circuit comprises a diode D2, a diode D3, a diode D4, a diode D5, and it is used to reduce voltage, generally can reduce 0.6V.This switching circuit comprises a SW1, a resistance R 16, a capacitor C 3, a capacitor C 4.
This charging control circuit is used for electricity and is connected between external interface circuit and the battery, to allow the external power supply be battery charge.This charging control circuit comprises a resistance R 5, a triode Q1, a triode Q2, a resistance R 8, a resistance R 6, a resistance R 11, a resistance R 12, a resistance R 13.The E utmost point of this triode Q1 connects by the output electricity of resistance R 5 and external interface circuit, and the C utmost point and the battery electricity of triode Q1 connect, and the C of the B utmost point of this triode Q1 by resistance R 8 and triode Q2 extremely electricity connects.The B utmost point of this triode Q2 connects by the PWM interface electricity of resistance R 12, R13 and communication module, the E utmost point ground connection of this triode Q2, electric connecting resistance R11 between the E utmost point of this triode Q2 and the B utmost point of triode Q2.
This commutation circuit of powering comprises a metal-oxide-semiconductor and a protective circuit, and MOS1 can adopt AO3401.This metal-oxide-semiconductor drain electrode electricity connects battery, the source electrode electricity meets the SW1 of switching circuit, grid is by resistance R 7 ground connection, when external power supply is arranged metal-oxide-semiconductor by and provide electric energy by external power supply for communication module, metal-oxide-semiconductor conducting and provide electric energy for communication module when no external power supply by battery.This protective circuit; it comprises a triode Q3, a triode Q4, a diode D10, a resistance R 4, a resistance R 9, a resistance R 10; Q3 can adopt 9012, Q4 can adopt 9013/9014; the value of this resistance R 4, resistance R 9 is greater than (for example 51K ohm) more than K ohm; avoid the loss of internal battery, the value of R10 depends on that the value of R9 decides dividing potential drop.The B utmost point of this triode Q3 connects by the output electricity of resistance R 4 and external interface circuit, and the E utmost point and the battery electricity of this triode Q3 connect, and the B of the C utmost point of this triode Q3 by resistance R 9 and triode Q4 extremely electricity connects.The E utmost point ground connection of this triode Q4, the C of this triode Q4 extremely electricity is connected between the resistance R 13 and resistance R 12 of charging control circuit, make the C utmost point of triode Q4 and triode Q1 B extremely electricity meet electric connecting resistance R10 between the E utmost point of this triode Q4 and the B utmost point of triode Q4.The B of this diode D10 anode and triode Q3 extremely electricity connects, and this diode D10 cathodic electricity connects the metal-oxide-semiconductor grid.
Not specifically described components and parts can directly adopt the corresponding components and parts of background technology (as Fig. 2 or Fig. 3) among the present embodiment.
When external power supply was arranged, the Veb of this Q3 was a negative pressure, and Q3 ends, and the B pole tension of Q4 is a low level, and Q4 ends, and external power supply is drawn high the metal-oxide-semiconductor grid by D10, so that metal-oxide-semiconductor ends, so that external power directly provides electric energy for communication module.Communication module has learnt that by the POWER interface electricity connects external power.This communication module PWM mouth provides control voltage to Q2, and the output high level makes the Q2 conducting, makes the Q1 conducting; At this moment another road of dispatch from foreign news agency charges the battery through R5, Q1, realizes charging control by communication module.
When external dump (no external power supply), the Veb of this Q3 is higher than more than the 0.3V, make the Q3 conducting, because of giving the B utmost point power supply of Q4, Q3 makes the Q4 conducting, drag down to communication module the control voltage of Q2, make Q1 be in cut-off state, this Q1 is a low level by making the metal-oxide-semiconductor grid voltage, to guarantee the metal-oxide-semiconductor conducting, so that battery provides electric energy for communication module.
Among another preferred embodiment, please refer to Fig. 5, it and a last embodiment difference are:
This commutation circuit of powering comprises a metal-oxide-semiconductor and a protective circuit.This metal-oxide-semiconductor drain electrode electricity connects battery, and the source electrode electricity meets the SW1 of switching circuit, when external power supply is arranged metal-oxide-semiconductor by and provide electric energy by external power supply for communication module, metal-oxide-semiconductor conducting and provide electric energy for communication module when no external power supply by battery.This protective circuit, it comprises a triode Q3, a triode Q4, a resistance R 4, a resistance R 9, a resistance R 10, a resistance 13, a resistance 7.The B utmost point of this triode Q3 connects by the output electricity of resistance R 4 and external interface circuit, the E utmost point and the battery electricity of this triode Q3 connect, the B of the C utmost point of this triode Q3 by resistance R 9 and triode Q4 extremely electricity connects, the E utmost point ground connection of this triode Q4, the C utmost point of this triode Q4 connects the metal-oxide-semiconductor grid by resistance R 13 electricity, electric connecting resistance R10 between the E utmost point of this triode Q4 and the B utmost point of triode Q4.The B of these resistance R 7 one ends and triode Q3 extremely electricity connects, and the C of the other end and triode Q4 extremely electricity meets (electric connecting resistance R13).
When external power supply was arranged, the Veb of this Q3 was a negative pressure, and Q3 ends, and the B pole tension of Q4 is a low level, and Q4 ends, and external power supply is drawn high the metal-oxide-semiconductor grid by R7, so that metal-oxide-semiconductor ends, so that external power directly provides electric energy for communication module.
When external dump, the Veb of this Q3 is higher than more than the 0.3V, makes the Q3 conducting, makes the Q4 conducting because of Q3 gives the B utmost point power supply of Q4, and the Q4 conducting drags down the grid of metal-oxide-semiconductor, to guarantee the metal-oxide-semiconductor conducting, so that battery provides electric energy for communication module.
The above, only for preferred embodiment of the present invention, so can not limit scope of the invention process with this, i.e. the equivalence of doing according to the present patent application claim and description changes and modification, all should still belong in the scope that patent of the present invention contains.
Claims (6)
1. wireless commerical power management circuit, it comprises a communication module, a battery, an external interface circuit, dispatch from foreign news agency power supply circuits, a charging control circuit and a power supply commutation circuit;
This external interface circuit is used for electricity and connects external power;
These dispatch from foreign news agency power supply circuits are used for electricity and are connected between external interface circuit and the communication module, and to allow the external power supply be that communication module provides power supply, it comprises a pressure limiting circuit and a switching circuit;
This charging control circuit is used for electricity and is connected between external interface circuit and the battery, to allow the external power supply be battery charge;
This commutation circuit of powering, it comprises a metal-oxide-semiconductor, and this metal-oxide-semiconductor drain electrode electricity connects battery, and the source electrode electricity connects switching circuit, make when external power supply is arranged metal-oxide-semiconductor by and provide electric energy by external power supply for communication module, metal-oxide-semiconductor conducting and provide electric energy for communication module when no external power supply by battery;
It is characterized in that: this power supply commutation circuit also comprises a protective circuit; this protective circuit electricity connects external interface circuit, battery and dispatch from foreign news agency power supply circuits; when being used for outside dump; making the metal-oxide-semiconductor grid voltage is low level; make between metal-oxide-semiconductor source electrode and the grid and have voltage difference, make metal-oxide-semiconductor be in conducting state.
2. a kind of wireless commerical power management circuit according to claim 1 is characterized in that: this charging control circuit, and it comprises:
One triode Q1, the E utmost point and the external interface circuit electricity of this triode Q1 connect, and the C utmost point and the battery electricity of triode Q1 connect; And
One triode Q2, the C utmost point of this triode Q2 and the B of triode Q1 extremely electricity connect, and the B utmost point and the communication module electricity of this triode Q2 connect, the E utmost point ground connection of this triode Q2;
Wherein: when external power supply was arranged, communication module provided control voltage to Q2, made the Q1 conducting, allowed external power supply charge the battery.
3. a kind of wireless commerical power management circuit according to claim 2 is characterized in that: this protective circuit, and it comprises:
One triode Q3, the B utmost point and the external interface circuit electricity of this triode Q3 connect, and the E utmost point and the battery electricity of this triode Q3 connect;
One triode Q4, the B utmost point of this triode Q4 and the C of triode Q3 extremely electricity connect, the E utmost point ground connection of this triode Q4, the C utmost point of this triode Q4 and the B of triode Q1 extremely electricity connect; And
One diode D10, the B of this diode D10 anode and triode Q3 extremely electricity connects, and this diode D10 cathodic electricity connects the metal-oxide-semiconductor grid;
Wherein: this metal-oxide-semiconductor grid is by resistance R 7 ground connection; When external power supply was arranged, this Q3 ended, and Q4 ends, and external power supply is drawn high the metal-oxide-semiconductor grid by D10, so that metal-oxide-semiconductor ends; When external dump, this Q3 conducting, the Q4 conducting, Q1 ends, and this Q1 is a low level by making the metal-oxide-semiconductor grid voltage, to guarantee the metal-oxide-semiconductor conducting.
4. a kind of wireless commerical power management circuit according to claim 3, it is characterized in that: the B utmost point of this triode Q3 connects external interface circuit by resistance R 4 electricity, the C utmost point of this triode Q3 connects the B utmost point of triode Q4 by resistance R 9 electricity, and electricity is connected to resistance R 10 between the B utmost point of this triode Q4 and the E utmost point of triode Q4.
5. a kind of wireless commerical power management circuit according to claim 2 is characterized in that: this protective circuit, and it comprises:
One triode Q3, the B utmost point and the external interface circuit electricity of this triode Q3 connect, and the E utmost point and the battery electricity of this triode Q3 connect;
One triode Q4, the B utmost point of this triode Q4 and the C of triode Q3 extremely electricity connect, the E utmost point ground connection of this triode Q4, the C utmost point of this triode Q4 connects the metal-oxide-semiconductor grid by resistance R 13 electricity;
One resistance R 7, the B of these resistance R 7 one ends and triode Q3 extremely electricity connects, and the C of the other end and triode Q4 extremely electricity connects;
Wherein: when external power supply was arranged, this Q3 ended, and Q4 ends, and external power supply is drawn high the metal-oxide-semiconductor grid by R7, so that metal-oxide-semiconductor ends; When external dump, this Q3 conducting, it is low level that Q4 conducting, this Q4 conducting make the metal-oxide-semiconductor grid voltage, to guarantee the metal-oxide-semiconductor conducting.
6. a kind of wireless commerical power management circuit according to claim 5, it is characterized in that: the B utmost point of this triode Q3 connects external interface circuit by resistance R 4 electricity, the C utmost point of this triode Q3 connects the B utmost point of triode Q4 by resistance R 9 electricity, and electricity is connected to resistance R 10 between the B utmost point of this triode Q4 and the E utmost point of triode Q4.
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| CN2009101120565A CN101588065B (en) | 2009-06-15 | 2009-06-15 | Wireless commerical power management circuit |
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| CN2009101120565A CN101588065B (en) | 2009-06-15 | 2009-06-15 | Wireless commerical power management circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969694A (en) * | 2020-08-28 | 2020-11-20 | 深圳市新国都支付技术有限公司 | Power supply switching system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969694A (en) * | 2020-08-28 | 2020-11-20 | 深圳市新国都支付技术有限公司 | Power supply switching system |
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Granted publication date: 20110105 Termination date: 20130615 |