A kind ofly exchange the AC air compressor controller mixed with direct current DCTechnical field
The present invention relates to field of air compressor, particularly relate to and a kind ofly exchange the AC air compressor controller mixed with direct current DC.
Background technology
Current air compressor machine control circuit otherwise be AC network AC input power supply, or be lithium battery bag DC input power supply.All there is the restriction of use occasion in these two kinds of modes.
The use occasion of AC network AC input requirements must have AC to input power supply, inconvenient to open air use.Lithium battery bag DC inputs power supply air compressor machine, because lithium battery bag finite capacity, limits the service time of air compressor machine.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of circuit realiration simple, circuit common hardware cost is low, and reliability is high can exchange the AC air compressor controller mixed with direct current DC.
The technical scheme that the present invention adopts is: provide a kind of and exchange the AC air compressor controller mixed with direct current DC, the control circuit in this controller comprises successively:
Input circuit, by a diverter switch, make supply power mode direct current DC power and exchange AC power between switch;
Rectification circuit, comprises the rectifier bridge of four diode compositions and the electric capacity in parallel with rectifier bridge;
Control circuit, comprises control centre and power switch, control centre's Detection capacitance voltage, and sends pulse width modulating signal PWM control duty ratio, then provides operation power by power switch to motor.
In a preferred embodiment of the present invention, between input circuit and rectification circuit, be also provided with Electro Magnetic Compatibility circuit EMC.
In a preferred embodiment of the present invention, when diverter switch is switched to direct current supply, direct current absorbs electromagnetic interference through EMC circuit, input rectifying bridge again, by rectifier bridge diode to capacitor charging, control circuit detects voltage on electric capacity, and output pwm signal controls power switch and runs to feeding electric motors, can produce electromagnetic interference in motor operation course and feed back to electric capacity, electric capacity absorbs interference through EMC circuit again.
In a preferred embodiment of the present invention, when diverter switch is switched to Alternating Current Power Supply, alternating current absorbs electromagnetic interference through EMC circuit, input rectifying bridge carries out full-wave rectification output dc voltage to capacitor charging, control circuit detects voltage on electric capacity, output pwm signal controls power switch and runs to feeding electric motors, can produce electromagnetic interference and feed back to electric capacity in motor operation course, and electric capacity absorbs interference through EMC circuit again.
In a preferred embodiment of the present invention, described direct current supply is powered by lithium battery bag.
The invention has the beneficial effects as follows: the present invention exchanges AC and direct current dc-input power can arbitrarily switch, the control circuit of AC and DC power supply Mixed design is applied to air compressor machine, and circuit realiration is simple, and circuit common hardware cost is low, power switch switching controls electric moter voltage, reliability is high; User uses on power supply at air compressor machine alternative, and functional characteristic does not reduce, and makes air compressor machine applied environment have more more options.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings, wherein:
Fig. 1 is the structural representation that the present invention exchanges the preferred embodiment of the AC air compressor controller mixed with direct current DC one.
Embodiment
Be clearly and completely described to the technical scheme in the embodiment of the present invention below, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, the embodiment of the present invention comprises:
Exchange the air compressor controller that AC is mixed with direct current DC, the control circuit in this controller comprises successively:
Input circuit, by a diverter switch, make supply power mode direct current DC power and exchange AC power between switch; Wherein, the direct current supply in the present invention is powered by lithium battery bag.
Power supply exports through Electro Magnetic Compatibility circuit EMC from input circuit, enters rectification circuit.
Rectification circuit, comprises the rectifier bridge of four diode compositions and the electric capacity in parallel with rectifier bridge.
Control circuit, comprises control centre and power switch, control centre's Detection capacitance voltage, and sends pulse width modulating signal PWM control duty ratio, then provides operation power by power switch to motor.
When diverter switch is switched to direct current supply, direct current absorbs electromagnetic interference, now EMC circuit function through EMC circuit: make equipment have certain noise immunity to the electromagnetic interference existed in the environment.Direct current is input rectifying bridge again, by rectifier bridge diode to capacitor charging, control circuit detects voltage on electric capacity, output pwm signal controls power switch and runs to feeding electric motors, electromagnetic interference can be produced in motor operation course and feed back to electric capacity, electric capacity absorbs interference through EMC circuit again, and now EMC circuit function is that the electromagnetic interference that makes to produce in equipment work is lower than certain limit value.
When diverter switch is switched to Alternating Current Power Supply, alternating current absorbs electromagnetic interference, now EMC circuit function through EMC circuit: make equipment have certain noise immunity to the electromagnetic interference existed in the environment.Input rectifying bridge carries out full-wave rectification output dc voltage to capacitor charging, control circuit detects voltage on electric capacity, output pwm signal controls power switch and runs to feeding electric motors, can produce electromagnetic interference and feed back to electric capacity in motor operation course, and electric capacity absorbs interference through EMC circuit again.Now EMC circuit function is that the electromagnetic interference that makes to produce in equipment work is lower than certain limit value.
Moment is inputted when input switch is switched to lithium battery bag direct current DC in interchange AC input; capacitor direct current voltage is higher than lithium battery bag magnitude of voltage; now because rectifier bridge diode exists; capacitance voltage cannot charge to lithium battery bag; play protection lithium battery bag; avoid, because of electric capacity reverse charging, overcharging the danger of damage.
The present invention exchanges AC and direct current dc-input power can arbitrarily switch, and the control circuit of AC and DC power supply Mixed design is applied to air compressor machine, and circuit realiration is simple, and circuit common hardware cost is low, power switch switching controls electric moter voltage, and reliability is high; User uses on power supply at air compressor machine alternative, and functional characteristic does not reduce, and makes air compressor machine applied environment have more more options.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.