CN208820754U - Switching circuit of power supply - Google Patents
Switching circuit of power supply Download PDFInfo
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- CN208820754U CN208820754U CN201821572504.0U CN201821572504U CN208820754U CN 208820754 U CN208820754 U CN 208820754U CN 201821572504 U CN201821572504 U CN 201821572504U CN 208820754 U CN208820754 U CN 208820754U
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- switching circuit
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Abstract
The utility model provides a kind of switching circuit of power supply, including input terminal GPRS_EN, output end V_GPRS, field effect transistor Q1, transistor Q2, resistance R1, resistance R2, resistance R3, resistance R4, diode D1, capacitor C1, capacitor C2, battery.The utility model solves the hidden danger of leakage current, expands cell applicability, and do not influence on the stability of circuit and power consumption index.
Description
Technical field
The utility model relates to electronic circuit technology fields, more particularly to switching circuit of power supply.
Background technique
Intelligent gas meter and intellectual water meter, which have significant portion, currently on the market is supplied using built-in disposable lithium ion battery
Electricity, and in such a way that GPRS is as wireless remote transmission.Often with there is following two feature: the first entire circuit portion in its use process
Divide most times all in low power consumpting state, standby current is required extremely stringent；Second is that GPRS module does not supply usually
Electricity just powers to GPRS module by the switching circuit that MCU in intelligent meter is controlled only when needing wireless telecommunications.Due to GPRS
The immediate current that module requires at work is bigger, and intelligent meter itself is due to volume and cost and safety,
It is not available the battery for meeting this discharge capability requirement, generallys use large bulk capacitance in parallel to reduce to battery immediate current
Requirement.It the position of capacitor parallel connection can be in the end GPRS or battery-end.Very big fill can be generated since capacitor is energized moment
Electric current and be easy to cause cell voltage to fall, the stability of system is influenced, so common position in parallel is in electricity at present
Chi Duan, such capacitor are exactly normal electrification, according to large bulk capacitance product standard, at present in room temperature on the capacitor theory of common capacity
When may be more than standby current requirement, leakage current at high temperature can increase, while the capacitor energy band of larger capacity
Carry out the applicability of better GPRS working effect and battery, but leakage current is also synchronous to be increased, and low power dissipation design is unable to reach
It is required that.And large bulk capacitance is simply parallel to GPRS module end, as shown in Fig. 2, can be generated in switch conduction moment very big
Capacitance charging current, cause battery terminal voltage to fall, it is unstable so as to cause the system of intelligent meter.
Utility model content
For the defects in the prior art, the purpose of the utility model is to provide a kind of switching circuit of power supply.
According to a kind of switching circuit of power supply provided by the utility model, including input terminal GPRS_EN, output end V_GPRS,
Field effect transistor Q1, transistor Q2, resistance R1, resistance R2, resistance R3, resistance R4, diode D1, capacitor C1, capacitor C2, electricity
Pond；Wherein, one end of the input terminal GPRS_EN connection resistance R4, the base stage of the other end connection transistor Q2 of resistance R4 are brilliant
The emitter of body pipe Q2 be separately connected capacitor C1 a pole plate, the collector of transistor Q2 is separately connected the one of resistance R3
It holds, one end of the anode of diode D1, resistance R1, the other end of resistance R1 is separately connected the cathode of diode D1, field-effect crystalline substance
One end of the grid of body pipe Q1, resistance R2, another pole plate of the other end connection capacitor C1 of resistance R2, the resistance R3's
The other end is separately connected the anode of the source electrode of field effect transistor Q1, battery, and the cathode of battery connects ground, field effect transistor Q1
Drain electrode be separately connected a pole plate of output end V_GPRS, capacitor C2, another pole plate of capacitor C2 connects ground.
Preferably, the input terminal GPRS_EN is the control of entire switching circuit, gives input terminal GPRS_EN input high electricity
Usually, switching circuit of power supply is connected, when giving input terminal GPRS_EN input low level, switching circuit of power supply open circuit.
Preferably, the maximum instantaneous that the capacitor C2 can make the battery current in switching circuit of power supply be less than battery is discharged
Electric current.
Preferably, the capacitor C1, resistance R1 resistance R2 can make maximum of switching circuit of power supply when being connected to capacitor C2
Charging current is less than the maximum instantaneous discharge current of battery.
Preferably, the bleeder circuit that the resistance R3, diode D1, resistance R2 are formed made in the moment for being just switched on battery
Voltage Vgs between effect transistor Q1 grid and source electrode is less than the threshold voltage vt h of field effect transistor Q1, and plug battery is not
It can cause the transient switching of switch.
Compared with prior art, the preference of the utility model structurally reasonable, easy maintenance, the utility model has such as
Under the utility model has the advantages that
1, the utility model can select large bulk capacitance according to the actual conditions of battery, to electricity when reducing GPRS work
The requirement of the maximum instantaneous discharge current in pond expands cell applicability.
2, the utility model can control capacitance charging current in switch conduction, and it is unstable not will cause system.
Though 3, the utility model is using large bulk capacitance, but not generates leakage current, to ensure that the low function of intelligent meter
Consumption requires.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other spies of the utility model
Sign, objects and advantages will become more apparent upon:
Fig. 1 is the circuit diagram of the utility model.
Fig. 2 is the circuit diagram of simple switch circuit.
Specific embodiment
The utility model is described in detail combined with specific embodiments below.Following embodiment will be helpful to this field
Technical staff further understands the utility model, but does not limit the utility model in any form.It should be pointed out that ability
For the those of ordinary skill in domain, without departing from the concept of the premise utility, several changes and improvements can also be made.
These are all within the protection scope of the present invention.
According to a kind of switching circuit of power supply provided by the utility model, as shown in Figure 1, including input terminal GPRS_EN, output
Hold V_GPRS, field effect transistor Q1, transistor Q2, resistance R1, resistance R2, resistance R3, resistance R4, diode D1, capacitor
C1, capacitor C2, battery；Wherein, the other end of one end of the input terminal GPRS_EN connection resistance R4, resistance R4 connects crystal
The base stage of pipe Q2, the emitter of transistor Q2 be separately connected capacitor C1 a pole plate, the collector of transistor Q2 difference
One end of one end of resistance R3, the anode of diode D1, resistance R1 is connected, the other end of resistance R1 is separately connected diode D1's
One end of cathode, the grid of field effect transistor Q1, resistance R2, another pole plate of the other end connection capacitor C1 of resistance R2,
The other end of the resistance R3 is separately connected the anode of the source electrode of field effect transistor Q1, battery, and the cathode of battery connects ground, field
The drain electrode of effect transistor Q1 is separately connected a pole plate of output end V_GPRS, capacitor C2, and another pole plate of capacitor C2 connects
Ground connection.
Preferably, the input terminal GPRS_EN is the control of entire switching circuit, gives input terminal GPRS_EN input high electricity
Usually, switching circuit of power supply is connected, usually to input terminal GPRS_EN input height, switching circuit of power supply open circuit.
Preferably, the maximum instantaneous that the capacitor C2 can make the battery current in switching circuit of power supply be less than battery is discharged
Electric current.The capacitor C1, resistance R1 resistance R2 can make switching circuit of power supply small to the maximum charging current of capacitor C2 when being connected
In the maximum instantaneous discharge current of battery.The bleeder circuit that the resistance R3, diode D1, resistance R2 are formed makes be just switched on electricity
Voltage Vgs between the moment field effect transistor Q1 grid and source electrode in pond is less than the threshold voltage vt h of field effect transistor Q1,
Plug battery will not cause the transient switching of switch.
Preferably, resistance R4 and transistor Q2 only play on-off action, can use similar circuit or individual physical switch
Instead of.
Preferably, field effect transistor Q1 is metal-oxide-semiconductor, and the switching circuit of PMOS tube can be switched using NMOS tube in Fig. 1
Circuit replaces.
The switching circuit of power supply working principle is as follows:
Input terminal GPRS_EN is the control of entire switching circuit, generally controls input signal by the MCU of intelligent meter, gives
When input terminal GPRS_EN input low level, Q2 is not turned on, and battery is by resistance R3, diode D1, resistance R1, resistance R2 to electricity
Hold C1 to charge, after charging complete, voltage, the S point voltage of voltage, G point on capacitor C1 are equal, field effect transistor Q1 grid
Voltage Vgs=0 between pole and source electrode, field effect transistor Q1 are not turned on, and it is zero that output end V_GPRS, which exports electric current,.
When to input terminal GPRS_EN input high level, Q2 conducting, A point is low level, and capacitor C1 passes through resistance 2, resistance
R1, transistor Q2 discharge, and G point voltage gradually decreases, and the voltage Vgs between field effect transistor Q1 grid and source electrode is gradually
It increases, when the value of Vgs is increased to the value of the threshold voltage vt h more than or equal to field effect transistor Q1, field effect transistor Q1
Conducting, increases charging current Id, that is, field effect transistor Q1 source-drain current of capacitor C2 since 0 and progressivelyes reach saturation, Id
Maximum value according to calculating, be proportional to the capacity of capacitor C2, be inversely proportional to (R1+R2) × C1.After capacitor C2 is full of, field-effect is brilliant
The source-drain current of body pipe Q1 has reached saturation state, and field effect transistor Q1 is fully on, and one tens milli is equivalent to after conducting
The resistance in Europe, therefore switching circuit voltage drop can the sufficiently small normal work for not influencing GPRS but.
Specific embodiment of the utility model is described above.It is to be appreciated that the utility model not office
It is limited to above-mentioned particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims,
This has no effect on the substantive content of the utility model.In the absence of conflict, the spy in embodiments herein and embodiment
Sign can be arbitrarily combined with each other.
Claims (5)
1. a kind of switching circuit of power supply, which is characterized in that including input terminal GPRS_EN, output end V_GPRS, field effect transistor
Q1, transistor Q2, resistance R1, resistance R2, resistance R3, resistance R4, diode D1, capacitor C1, capacitor C2, battery；Wherein, described
One end of input terminal GPRS_EN connection resistance R4, the base stage of the other end connection transistor Q2 of resistance R4, the transmitting of transistor Q2
Pole be separately connected capacitor C1 pole plate, the collector of transistor Q2 is separately connected one end of resistance R3, diode D1
One end of anode, resistance R1, the other end of resistance R1 be separately connected the cathode of diode D1, field effect transistor Q1 grid,
One end of resistance R2, another pole plate of the other end connection capacitor C1 of resistance R2, the other end of the resistance R3 are separately connected
The cathode of the anode of the source electrode of field effect transistor Q1, battery, battery connects ground, and the drain electrode of field effect transistor Q1 is separately connected
Another pole plate of a pole plate of output end V_GPRS, capacitor C2, capacitor C2 connects ground.
2. switching circuit of power supply according to claim 1, which is characterized in that the input terminal GPRS_EN is entirely to switch
The control of circuit, when giving input terminal GPRS_EN input high level, switching circuit of power supply conducting inputs low to input terminal GPRS_EN
When level, switching circuit of power supply open circuit.
3. switching circuit of power supply according to claim 1, which is characterized in that the capacitor C2 can make switching circuit of power supply
In battery current be less than battery maximum instantaneous discharge current.
4. switching circuit of power supply according to claim 1, which is characterized in that the capacitor C1, resistance R1 resistance R2 can
Switching circuit of power supply is set to be less than the maximum instantaneous discharge current of battery when being connected to the maximum charging current of capacitor C2.
5. switching circuit of power supply according to claim 1, which is characterized in that the resistance R3, diode D1, resistance R2 group
At bleeder circuit make the voltage Vgs being just switched between the moment field effect transistor Q1 grid of battery and source electrode less than field imitate
The threshold voltage vt h of transistor Q1 is answered, plug battery will not cause the transient switching of switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821572504.0U CN208820754U (en) | 2018-09-26 | 2018-09-26 | Switching circuit of power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821572504.0U CN208820754U (en) | 2018-09-26 | 2018-09-26 | Switching circuit of power supply |
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| Publication Number | Publication Date |
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| CN208820754U true CN208820754U (en) | 2019-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821572504.0U Active CN208820754U (en) | 2018-09-26 | 2018-09-26 | Switching circuit of power supply |
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| CN (1) | CN208820754U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110492567A (en) * | 2019-06-26 | 2019-11-22 | 上海云衡科技有限公司 | Power supply system |
| CN111934301A (en) * | 2020-07-16 | 2020-11-13 | 山东超越数控电子股份有限公司 | High-power hot plug control circuit and method |
-
2018
- 2018-09-26 CN CN201821572504.0U patent/CN208820754U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110492567A (en) * | 2019-06-26 | 2019-11-22 | 上海云衡科技有限公司 | Power supply system |
| CN110492567B (en) * | 2019-06-26 | 2021-03-26 | 上海云衡科技有限公司 | Power supply system |
| CN111934301A (en) * | 2020-07-16 | 2020-11-13 | 山东超越数控电子股份有限公司 | High-power hot plug control circuit and method |
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