CN107704006A - A kind of drive circuit of electronic device - Google Patents
A kind of drive circuit of electronic device Download PDFInfo
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- CN107704006A CN107704006A CN201710934420.0A CN201710934420A CN107704006A CN 107704006 A CN107704006 A CN 107704006A CN 201710934420 A CN201710934420 A CN 201710934420A CN 107704006 A CN107704006 A CN 107704006A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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Abstract
The invention provides a kind of drive circuit of electronic device, including voltage transformation voltage regulation unit, waveform generating unit and driver element, the wherein input of voltage transformation voltage regulation unit are used to receive input power；The output end of the input coupling voltage transformation voltage regulation unit of waveform generating unit, the output end of waveform generating unit provide the signal of wave period change；The output end of the signal input part coupling waveform generating unit of driver element, the power input of driver element are used to receive input power, and the output end of driver element is used to provide driving power for electronic device.Beneficial effects of the present invention：Operating voltage range is wide, can meet 1.8~36V operating voltage range requirement simultaneously；Without extra component, scheduling and planning is easy easily, saves cost for periphery；The drive circuit of the present invention there is certain anti-power supply reversal connection function simultaneously, the reversed damage that will not cause circuit between below 18V power supplys and ground wire.
Description
Technical field
The present invention relates to electric drive chip field, and in particular to a kind of drive circuit of electronic device.
Background technology
Existing buzzer drive circuit, is often driven using discrete component, and it is larger circuit volume to be present, production
The shortcomings that inconvenient debugging.In addition, the shortcomings that voltage power supply narrow limits also be present, below 5V is typically confined to.
The content of the invention
For one or more problems of the prior art, it is an object of the invention to provide a kind of wide operating voltage model
Enclose or do not need peripheral component or electronic device stable and reliable in work (such as buzzer) drive circuit.
In order to solve the above problems, one aspect of the present invention proposes：
A kind of drive circuit of electronic device, including voltage transformation voltage regulation unit, waveform generating unit and driver element, its
In
The input of voltage transformation voltage regulation unit is used to receive input power；
The output end of the input coupling voltage transformation voltage regulation unit of waveform generating unit, the output end of waveform generating unit
The signal of wave period change is provided；
The output end of the signal input part coupling waveform generating unit of driver element, the power input of driver element are used for
Input power is received, the output end of driver element is used to provide driving power for electronic device.
Optionally, the electronic device is buzzer.
Optionally, the voltage transformation voltage regulation unit includes the first current source TC1 and band gap reference, first electric current
Source TC1 input receives input power, output end coupling band gap reference, described in the output end coupling of the band gap reference
The input of waveform generating unit.
Optionally, the first current source TC1 includes PNP type triode P2, P3, NPN type triode N1, N2, field-effect
Pipe J1 and resistance R1；Wherein triode P2, P3 emitter stage receives input power, and base stage is mutually coupled, and is used as bias current
Output end；Triode P2 colelctor electrode coupling triode N1 colelctor electrode, triode P3 colelctor electrode coupling triode N2 collection
Electrode, triode N1, N2 base stage are connected, and triode N1 emitter stage is grounded by resistance R1, and triode N2 emitter stage connects
Ground；FET J1 drain electrode receives input power, source electrode coupling triode P3 and N2 colelctor electrode, grounded-grid.
Optionally, the band gap reference includes PNP type triode P1, NPN type triode N3-N6, resistance R2-R5 and electricity
Hold C1, wherein triode P1 emitter stage receives input power, and base stage couples the bias current output end, colelctor electrode coupling electricity
R2, R3, R5 one end and triode N6 colelctor electrode are hindered, and is used as band-gap reference source output terminal；Resistance R3 other end coupling
Triode N4 colelctor electrode, resistance R2 other end coupling capacitance C1 one end, triode N3 colelctor electrode and triode N5
Base stage, triode N3, N4 base stage are connected, and triode N4 emitter stage is grounded by resistance R4, resistance R5 other end coupling
The base stage of the electric capacity C1 other end, triode N5 colelctor electrode and triode N6, triode N3, N5, N6 grounded emitter.
Optionally, the waveform generating unit includes triangular wave generating unit and couples the waveform turn of triangular wave generating unit
Change unit, the triangular wave generating unit includes the second low-current source TC2, resistance R6-R8, electric capacity C2, C3, diode D1 and the
One comparator IC1, wherein the second low-current source TC2 input coupling voltage transformation voltage regulation unit output end, output end coupling
Resistance R6, electric capacity C2 one end and first comparator the IC1 pin of output 4；Resistance R6 other end coupling capacitance C3 one end and
The first comparator IC1 pin of anti-phase input 1；Resistance R7 one end coupling voltage transformation voltage regulation unit output end, other end coupling
The pin of homophase input 2 of resistance R8 one end, diode D1 positive pole and first comparator IC1；Diode D1 other end coupling
The first comparator IC1 pin of output 5；Electric capacity C2, C3 and resistance the R8 other end are grounded.
Optionally, the waveform converting unit includes resistance R9, R10 and the second comparator IC2；Wherein resistance R9 one end
Couple the anti-phase input of voltage transformation voltage regulation unit output end, other end coupling resistance R10 one end and the second comparator IC2
End；The second comparator IC2 in-phase input end coupling first comparator IC1 pin of output 4, output end are used to couple driver element
Signal input part；Resistance R10 other end ground connection.
Optionally, the driver element includes signal code amplifier IC3, amplifier Q1 and continued flow tube D2, wherein signal
The output end of current amplifier IC3 1 pin coupling waveform generating unit, 2 pin receive input power, 4 pin ground connection, and the coupling of 3 pin is put
Big device Q1 base stages；Amplifier Q1 colelctor electrode coupling continued flow tube D2 positive pole, and it is defeated as output end coupling electronic device signal
Enter end, grounded emitter；Continued flow tube D2 negative pole coupling input power.
Optionally, the driver element also includes voltage-regulator diode a DZ, the voltage-regulator diode DZ and the continued flow tube
D2 connects, and voltage-regulator diode DZ negative pole coupling continued flow tube D2 negative pole.
Optionally, the circuit integration packaging is in a chip, and 1 pin of the chip is used to receive input power, and 2 pin are used for
Ground connection, 3 pin connect driver element output end, for providing driving power for electronic device.
Another aspect of the present invention proposes a kind of drive system of electronic device, including as above described in either case
Drive circuit and buzzer.
Beneficial effects of the present invention：Operating voltage range is wide, can meet 1.8~36V operating voltage range requirement simultaneously；
Without extra component, scheduling and planning is easy easily, saves cost for periphery；The drive circuit of the present invention has necessarily simultaneously
Anti- power supply ground reversal connection function, the reversed damage that will not cause circuit between below 18V power supplys and ground wire.
Brief description of the drawings
Fig. 1 is the schematic diagram of existing simple buzzer drive circuit.
Fig. 2 is the unit composition and coupling relation schematic diagram of the drive circuit of an embodiment of the present invention.
Fig. 3 is the circuit diagram of the band-gap reference circuit of an embodiment of the present invention.
Fig. 4 is the circuit diagram of voltage transformation voltage regulation unit in a kind of Fig. 2 of preferred embodiment of the present invention.
Fig. 5 is the circuit diagram of the triangular wave generating unit of an embodiment of the present invention and produces waveform diagram.
Fig. 6 is a kind of circuit diagram of Fig. 2 intermediate cam ripple generating units of preferred embodiment of the present invention and produces waveform signal
Figure.
Fig. 7 is the circuit diagram that a kind of Fig. 2 intermediate cam ripple generating units of preferred embodiment of the present invention add waveform changing circuit.
Fig. 8 is that a kind of circuit of embodiment of drive circuit of the present invention couples schematic diagram.
Fig. 9 is that the circuit of the drive circuit another kind embodiment of the present invention couples schematic diagram.
Figure 10 is the typical case figure of the drive circuit of an embodiment of the present invention.
Embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described with reference to embodiment, still
It should be appreciated that these descriptions are simply further explanation the features and advantages of the present invention, rather than to the claims in the present invention
Limitation.
The description of the part is not limited merely to the model of embodiment description just for several typical embodiments, the present invention
Enclose.Same or like prior art means with some technical characteristics in embodiment mutually replace and also described in the present invention
In the range of protection.
" coupling " in specification, which includes, to be directly connected to, and is also included and is indirectly connected with, such as passes through some active devices, passive device
The connection that part or electrically-conducting medi are carried out.
Buzzer is a kind of common sounding component, applies DC voltage (active buzzer) or square wave at its both ends
(passive buzzer) can sounding.It is the drive circuit of existing buzzer as shown in Figure 1, triode Q1 plays on-off action,
The high level of its base stage makes triode saturation conduction, makes buzzer sounding；And base stage low level then closes triode, buzzer
Stop sounding.Further, since buzzer is substantially an inductive element, its electric current is unable to transition, it is therefore necessary to has one to continue
Flow diode and afterflow is provided.Otherwise, tens volts of peak voltage can be produced at buzzer both ends, triode may be damaged, and do
Disturb the other parts of whole circuit system.
Existing buzzer drive circuit or driving chip, due to designing imperfection, coupling is typically necessary when in use
Extra discrete component, cause installation and debugging inconvenient.
In consideration of it, as shown in Fig. 2 the invention provides a kind of drive circuit, including voltage transformation voltage regulation unit, waveform hair
Raw unit and driver element, the wherein input of voltage transformation voltage regulation unit are used to receive input power；Waveform generating unit
Input couples the output end of voltage transformation voltage regulation unit, and the output end of waveform generating unit provides the letter of wave period change
Number；The output end of the signal input part coupling waveform generating unit of driver element, the power input of driver element are used to receive
Input power, the output end of driver element are used to provide driving power for electronic device.
Using this design, whole drive circuit functionality is clear and complete, the peripheral first device extra without coupling during use
Part, scheduling and planning is easy easily, and saves cost.
Preferably, in embodiments of the invention, voltage transformation voltage regulation unit includes the first low-current source TC1
And band gap reference, wherein the first low-current source TC1 input receives input power, output end coupling band gap reference, band
The output end of gap a reference source couples the input of the waveform generating unit.
Technical scheme is described in further detail below by specific embodiment combination accompanying drawing.
It is illustrated in figure 3 the circuit diagram of the general band gap reference of an embodiment of the present invention.The circuit includes three
Individual Second-Type triode N7, N8 and N9, the output end of resistance R6, R7 and R8, wherein resistance R6 and R7 one end coupling current source,
Resistance R6 other end coupling triode N7 colelctor electrode, the resistance R7 other end coupling triode N8 colelctor electrode and triode
N9 base stage, triode N7, N8 base stage and triode N7 colelctor electrode are connected, and triode N8 emitter stage is connect by resistance R8
Ground, the output end of triode N9 colelctor electrode coupling band gap reference, triode N7, N9 grounded emitter.Wherein,
Ie7, Ie8, Ae7, Ae8 are respectively the emitter current of N7, N8 pipe and effective emitter area in formula,
Vref=VBE9+(ΔVBE/R8+IB9)*R7
IB9=Ic9/ β
ΔIB9=Δ Ic9/ β=Δ Io/ β
Δ Vref=Δs IB9* R7=(Δ Io/ β) * R7
I in formulaB9For the base current of N9 pipes, Ic9 is the collector current of N9 pipes, and β is the multiplication factor of NPN pipes, VBE9For
Negative temperature coefficient, and Δ VBEFor positive temperature coefficient, so adjusting Ae7, Ae8 and R7 in theory, R8 ratio can be achieved with
Vref zero-temperature coefficient.
But foregoing circuit also has the disadvantage that：Start the unwanted currents to get off with biasing circuit Io to absorb by N9 pipes entirely,
Namely Ic9 can change with Io change, and Ie9 size and the base current I of N9 pipesB9There are direct relation, IB9Size
Change can cause two sections of R7 voltage to change.Which results in Vref to change with Io change, namely Vref
Electric current is linearly bad.
Therefore, the electric current of band gap reference is linear and stability in order to improve, and the present invention is to the band gap in previous embodiment
A reference source has done further improvement, there is provided preferred voltage transformation voltage regulation unit.
In an advantageous embodiment, voltage transformation voltage regulation unit includes bipolarity bandgap reference cell, in addition to coupling
The current source cell and unwanted currents absorptive unit of the bandgap reference cell；It is band-gap reference list that the current source cell, which is used for,
Member provides current source；The bandgap reference cell is used to provide bandgap voltage reference；The unwanted currents absorptive unit is used to inhale
Receive the unwanted currents in current source, improve band-gap reference source circuit output electric current is linear and stability.Wherein bipolarity band gap
Transistor in reference cell is bipolar transistor.
It is illustrated in figure 4 the circuit coupling schematic diagram of its specific embodiment.Wherein, described bandgap reference cell includes three
Individual Second-Type triode N3, N4 and N5, resistance R2, R3 and R4, wherein resistance R2 and R3 one end couple the band-gap reference list
The output end of member, resistance R3 other end coupling triode N4 colelctor electrode, resistance R2 other end coupling triode N3 collection
The base stage of electrode and triode N5, triode N3, N4 base stage and triode N4 colelctor electrode are connected, triode N4 emitter stage
It is grounded by resistance R4, triode N5 colelctor electrode couples the output end of the bandgap reference cell, triode N3, N5 transmitting
Pole is grounded.
As a kind of preferred embodiment, described unwanted currents absorptive unit includes Second-Type triode N6, three pole
Pipe N6 colelctor electrode couples the output end of the current source cell, base stage coupling triode N5 colelctor electrode, grounded emitter.
As further preferred embodiment, further improve output end electric current is linear and stability, above-mentioned band
Gap reference cell further comprises resistance R5 and electric capacity C1, and wherein resistance R5 one end couples the output of the bandgap reference cell
End, other end coupling capacitance C1 one end and triode N5 colelctor electrode, electric capacity C1 other end coupling triode N3 current collection
Pole and triode N5 base stage.
On the other hand, in the present embodiment, described current source circuit includes the first type triode P1 and current biasing circuit,
Wherein the first type triode P1 emitter stage coupling input power, base stage coupling current biasing circuit, colelctor electrode are used to provide electricity
Stream source.
Preferably, current biasing circuit includes being used for start-up circuit and biasing circuit that low-voltage starts.
Wherein, start-up circuit includes FET J1 and Second-Type triode N2, wherein FET J1 drain electrode coupling
Input power, source electrode coupling triode N2 colelctor electrode and base stage, grounded-grid, triode N2 grounded emitter.
Biasing circuit includes first type triode P2, P3, Second-Type triode N1, and resistance R1, wherein triode P2
Input power is coupled with P3 emitter stage, triode P2, P3 base stage and triode P2 colelctor electrode are connected, triode N1 collection
Electrode coupling triode P2 colelctor electrode, base stage coupling triode N2 base stage and colelctor electrode, emitter stage are grounded by resistance R1,
Triode P3 colelctor electrode coupling FET J1 source electrode and triode N2 colelctor electrode and base stage.
In the bandgap reference cell of foregoing circuit：
Vref=VBE3+(ΔVBE/R4+IB3)*R3
IB3=Ic3/ β=((Vref-VBE5)/R2)/β
Δ Vref=Δs IB3*R3≈0
I in formulaB3For the base current of N3 pipes, Ic3 is the collector current of N3 pipes, and β is the multiplication factor of NPN pipes, in formula
Ie3, Ie4, Ae3, Ae4 are respectively the emitter current of N3, N4 pipe and effective emitter area, and adjustment N3 is managed, the transmitting of N4 pipes
The resistance ratio of pole-face product ratio and R3, R4, the reference voltage V ref of zero-temperature coefficient in theory can be obtained.
Meanwhile the unwanted currents Ip that P1 pipes get off finally absorbs by N6, when P1 collector current changes, N6 pipes
Base current Ib6 can produce change, but its variable quantity is for the collector current Ic5 of N5 pipes, proportion very little, instead
It should be ignored to can on N5 pipe base currents Ib5, so last Vref just becomes to the collector current Ic6 of N6 pipes
Change it is insensitive, this just greatly improve Vref electric current is linear and stability.
On the other hand, J1 pipes are managed for JFET, and, JFET pipes only need 0.1V or so electricity in itself by N2 pipes with being connected to power supply
Pressure can just open, and N2 pipe cut-in voltages are about 0.6V, so access power supply has begun to electric current in more than 0.7V, its electric current is made
For enabling signal, so that whole circuit is opened, the normal startup under low supply voltage is realized.
Meanwhile the colelctor electrode of P1 pipes exports constant electric current as output end.The voltage of band gap reference is set in
1.25V, and the saturation voltage drop of P1 pipes is typically in 0.25V or so, so when the access supply voltage of whole circuit is 1.5V, so that it may
To provide stable 1.25V reference voltages.Meanwhile it can be carried between 1.5~36V of input supply voltage for waveform generating unit
For stable bandgap voltage reference, the stability of whole drive circuit works ensure that.
In one embodiment, as shown in figure 4, current source circuit is also referred to as the first current source TC1, band-gap reference list
Member and unwanted currents absorptive unit can be described as band gap reference, and so described voltage transformation voltage regulation unit includes the first current source
TC1 and band gap reference, the input coupling input power of the first current source TC1, output end coupling band gap reference, institute
The output end for stating band gap reference couples the input of the waveform generating unit.The first current source TC1 includes the first type
Triode P1, P2, P3, Second-Type triode N1, N2, FET J1 and resistance R1；Wherein triode P2, P3 emitter stage connects
Input power is received, base stage is mutually coupled, and is used as bias current output end；Triode P1 emitter stage receives input power, base
Pole couples bias current output end, output end of the colelctor electrode as the first current source TC1；Triode P2 colelctor electrode couples three poles
Pipe N1 colelctor electrode, triode P3 colelctor electrode coupling triode N2 colelctor electrode, triode N1, N2 base stage are connected, three poles
Pipe N1 emitter stage is grounded by resistance R1, triode N2 grounded emitter；FET J1 drain electrode receives input power,
Source electrode coupling triode P3 and N2 colelctor electrode, grounded-grid.The band gap reference includes Second-Type triode N3-N6, electricity
R2-R5 and electric capacity C1 is hindered, wherein resistance R2, R3, R5 one end and triode N6 colelctor electrode couples the defeated of the first current source TC1
Go out end, and be used as band-gap reference source output terminal；Resistance R3 other end coupling triode N4 colelctor electrode, the resistance R2 other end
The base stage of coupling capacitance C1 one end, triode N3 colelctor electrode and triode N5, triode N3, N4 base stage are connected, three poles
Pipe N4 emitter stage is grounded by resistance R4, the resistance R5 other end coupling capacitance C1 other end, triode N5 colelctor electrode
And triode N6 base stage, triode N3, N5, N6 grounded emitter.
In the preferred embodiments of the present invention, waveform generating unit includes triangular wave generating unit and list occurs for coupling triangular wave
The waveform converting unit of member, wherein triangular wave generating unit are used for the triangular signal for producing the cycle, and waveform converting unit is used for
Triangular signal is converted into square-wave signal.
It is illustrated in figure 5 the circuit of the general triangular wave generating unit of an embodiment of the present invention and its caused triangular wave
Signal schematic representation.
The triangular wave generating unit includes the second current source TC2 for receiving input power, is coupled in current source TC2 output
Electric capacity C3, the resistance R4 and R5 of the series connection for providing reference voltage between end and power supply ground, and comparator IC2 and two poles
Pipe D2.Resistance R4 first end coupling input power, the second end coupling resistance R5 first end, and export as the reference voltage
End, resistance R5 the second end ground connection.The comparator IC2 pin of inverting input 1 coupling current source TC2 output end, positive input
2 pin coupling resistance R4 the second end is held, the pin of output end 4 couples current source TC2 output end, and as the defeated of wave generator circuit
Go out end, the first end that the pin of output end 5 passes through oppositely arranged diode D2 coupling resistances R5.
Its principle is：When C3 electric capacity is charged to crest voltage Vp, comparing IC2 upsets, its 4 pin, 5 pin start sourcing current,
I.e. IC2 underfooting drops to 0.7V, and C3 electric capacity starts to discharge, and when C3 drops to valley point voltage Vg (0.7V) in theory, comparator IC2 is again
Secondary upset, the cut-off of 4,5 pin, C3 electric capacity start to charge up again.This is a triangular wave oscillation cycle.
The shortcomings that such a design is：IC2 4 pin discharge rates are very fast, and IC2 has certain delay, so triangular wave
Valley certain overdischarge be present so that the valley Vg of triangular wave has fluctuation.
In order to overcome drawbacks described above, the triangular wave generating unit in the present invention has done further improvement, there is provided following
Triangular wave wave generator circuit, including：
Current source, its input receive input power；
First electric capacity, it is coupled between the output end of current source and power supply ground；
Comparing unit, has first input end, the second input and output end, and wherein first input end is used to receive the cycle
Property change signal, the second input is used to receive reference voltage, and output end is used to provide triangular wave；
First resistor, first end couple the output end of current source, and the second end couples the first input end of comparing unit；And
Second electric capacity, it is coupled between the second end of first resistor and power supply ground, wherein first resistor and the second electric capacity are used
It is substantially discharged in making the first electric capacity.
Preferably, above-mentioned triangular wave wave generator circuit also includes reference voltage circuit, including second
The first end coupling input power of resistance and 3rd resistor, wherein second resistance, the second end couple the first end of 3rd resistor, and
Output end as the reference voltage, the second end ground connection of 3rd resistor.
Preferably, above-mentioned comparing unit includes comparator and diode, and wherein comparator is anti-phase defeated
Enter the second end of end coupling first resistor, normal phase input end couples the output end of reference voltage circuit, output end coupling current source
Output end, and pass through the output end that oppositely arranged diode couples reference voltage circuit.
Using such a design, resistance and electric capacity are configured by the periodic signal inlet circuit in comparing unit, improved
The discharge scenario of original electric capacity, enable to be substantially discharged, so that the valley of triangular wave can be reduced to 0 electricity by being substantially discharged
It is flat, the peak-to-peak value voltage of triangular wave is added, improves the uniformity of circuit, while improves the temperature characterisitic of circuit.
Above-mentioned triangular wave wave generator circuit is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
It is illustrated in figure 6 a kind of circuit coupling graph of a relation of preferred embodiment of above-mentioned triangle wave generating circuit and produces ripple
Shape schematic diagram.Wherein triangle wave generating circuit specifically includes：
Receive the current source TC2 of input power, the first electric capacity being coupled between current source TC2 output end and power supply ground
C1；First end coupling current source TC2 output end, the first resistor R1 of the first input end of the second end coupling comparing unit；Coupling
The second electric capacity C2 being connected between first resistor R1 the second end and power supply ground, and with first input end, the second input
With the comparing unit of output end.Wherein, the first input end of comparing unit is used to receive periodically variable signal, the second input
Hold for receiving reference voltage, output end is used to provide triangular wave；First resistor R1 and the second electric capacity C2 is used to make the first electric capacity
C1 is substantially discharged.
In addition, also include second resistance R2 and 3rd resistor R3, wherein second resistance R2 first end coupling input power,
Second end coupling 3rd resistor R3 first end, and output end as the reference voltage, 3rd resistor R3 the second end ground connection.
Preferably, above-mentioned comparing unit specifically includes comparator IC1 and diode D1, wherein comparator
The IC1 pin of inverting input 1 coupling first resistor R1 the second end, the pin of normal phase input end 2 couple the output of reference voltage circuit
End；The output end of the comparator IC1 pin of output end 4 coupling current source, and as the output end of wave generator circuit, output end 5
Pin couples the output end of reference voltage circuit by oppositely arranged diode D1.
The advantages of such a design, is as follows：More resistance R1 and electric capacity C2, comparator IC1 1 pin inspection in discharge loop
There is hysteresis when surveying C1 pin current potentials, so that electric capacity C1 can be substantially discharged.So that the valley of caused triangular wave can be by filling
Divide electric discharge to be reduced to 0 level, add the crest voltage of triangular wave, improve the uniformity of circuit.Meanwhile because of trough to 0
Level, does not produce fluctuation with the change of supply voltage and temperature, further improves the temperature characterisitic of circuit.
On the other hand, as shown in fig. 7, in above-described embodiment, waveform converting unit preferably includes resistance R4, R5 and second
Comparator IC2；Wherein resistance R4 one end coupling voltage transformation voltage regulation unit output end, other end coupling resistance R5 one end and
Second comparator IC2 inverting input；Second comparator IC2 in-phase input end coupling first comparator IC1 output 4
Pin, output end are used for the signal input part for coupling driver element；Resistance R5 other end ground connection.
It is illustrated in figure 8 the circuit diagram for the whole drive circuit for employing above-mentioned preferred embodiment.Wherein, drive
Moving cell includes signal code amplifier IC3, amplifier Q1 and continued flow tube D2, wherein signal code amplifier IC3 1 pin coupling
The output end of waveform generating unit, 2 pin receive input power, 4 pin ground connection, 3 pin coupling amplifier Q1 base stages；Amplifier Q1 collection
Electrode coupling continued flow tube D2 positive pole, and as output end coupling electronic device signal input part, grounded emitter；Continued flow tube D2
Negative pole coupling input power.
In foregoing circuit, when power supply and GND reversal connections, a diode characteristic can be formed between GND and 3 pin, it is resistance to be pressed in
0.7V or so, and the pressure-resistant only 0.7V of conventional fly-wheel diode, therefore GND to the reverse pressure-resistant only 1.4V between power supply.
When the voltage of reversal connection is bigger, the damage of circuit is easily caused.
In consideration of it, as shown in figure 9, in the drive circuit further preferred embodiment of the present invention, increase in the driving unit
A voltage-regulator diode DZ, voltage-regulator diode DZ has been added to be connected with continued flow tube D2, and voltage-regulator diode DZ negative pole coupling is continuous
Flow tube D2 negative pole.
After this improvement, 3 pin to the pressure-resistant lifting between supply pin to about 14V or so, so that GND is to the anti-of supply pin
To turn on it is pressure-resistant reach 14.7V or so, reversely damage and pressure-resistant reach 18V.In addition, in actual applications, after series diode DZ,
Relative to the mode of original single diode continuousing flow, the loudness of identical buzzer also has a certain upgrade.
As shown in Figure 8 and Figure 9, drive circuit of the invention, over all Integration are packaged in a chip, and 1 pin of the chip
For receiving input power, 2 pin are used to be grounded, and 3 pin connect driver element output end, for providing driving power for electronic device.
Its typical case mode is as shown in Figure 10.The chip operating voltage scope is wide, and periphery is without extra component, scheduling and planning letter
Just easily, cost is low, and reversal connection function with certain anti-power supply, can meet the needs of in the market major part user, have
Good practicality and market prospects.
As shown in figure 8, triangular wave generating unit includes the second current source TC2, resistance R6-R8, electric capacity C2, C3, diode
D1 and first comparator IC1, wherein the second current source TC2 input coupling voltage transformation voltage regulation unit output end, output end
Coupling resistance R6, electric capacity C2 one end and first comparator the IC1 pin of output 4；The one of resistance R6 other end coupling capacitance C3
End and the first comparator IC1 pin of anti-phase input 1；Resistance R7 one end coupling voltage transformation voltage regulation unit output end, the other end
The pin of homophase input 2 of coupling resistance R8 one end, diode D1 positive pole and first comparator IC1；The diode D1 other end
Couple the first comparator IC1 pin of output 5；Electric capacity C2, C3 and resistance the R8 other end are grounded.
The waveform converting unit includes resistance R9, R10 and the second comparator IC2；Wherein resistance R9 one end coupling electricity
Buckling changes the inverting input of voltage regulation unit output end, other end coupling resistance R10 one end and the second comparator IC2；Second
The comparator IC2 in-phase input end coupling first comparator IC1 pin of output 4, output end are used for the signal for coupling driver element
Input；Resistance R10 other end ground connection.
The explanation of above example is only intended to help the method and its core concept for understanding the present invention.It should be pointed out that pair
For those skilled in the art, under the premise without departing from the principles of the invention, the present invention can also be carried out
Some improvement and modification, these are improved and modification is also fallen into the protection domain of the claims in the present invention.
Claims (12)
1. a kind of drive circuit of electronic device, including voltage transformation voltage regulation unit, waveform generating unit and driver element, wherein
The input coupling input power of voltage transformation voltage regulation unit；
The output end of the input coupling voltage transformation voltage regulation unit of waveform generating unit, the output end of waveform generating unit provide
The signal of wave period change；
The output end of the signal input part coupling waveform generating unit of driver element, the power input of driver element are used to receive
Input power, the output end of driver element are used to provide driving power for electronic device.
2. the drive circuit of electronic device as claimed in claim 1, it is characterised in that：The electronic device includes buzzer.
3. the drive circuit of electronic device as claimed in claim 1, it is characterised in that：The voltage transformation voltage regulation unit includes
First current source TC1 and band gap reference, the input coupling input power of the first current source TC1, output end coupled belt
Gap a reference source, the output end of the band gap reference couple the input of the waveform generating unit.
4. the drive circuit of electronic device as claimed in claim 3, it is characterised in that：The first current source TC1 includes the
One type triode P1, P2, P3, Second-Type triode N1, N2, FET J1 and resistance R1；Wherein triode P2, P3 transmitting
Pole receives input power, and base stage is mutually coupled, and is used as bias current output end；Triode P1 emitter stage receives input electricity
Source, base stage coupling bias current output end, output end of the colelctor electrode as the first current source TC1；Triode P2 colelctor electrode coupling
Connect triode N1 colelctor electrode, triode P3 colelctor electrode coupling triode N2 colelctor electrode, triode N1, N2 base stage phase
Even, triode N1 emitter stage is grounded by resistance R1, triode N2 grounded emitter；FET J1 drain electrode receives defeated
Enter power supply, source electrode coupling triode P3 and N2 colelctor electrode, grounded-grid.
5. the drive circuit of electronic device as claimed in claim 3, it is characterised in that：The band gap reference includes Second-Type
Triode N3-N6, resistance R2-R5 and electric capacity C1, wherein resistance R2, R3, R5 one end and triode N6 colelctor electrode coupling the
One current source TC1 output end, and it is used as band-gap reference source output terminal；Resistance R3 other end coupling triode N4 current collection
Pole, the base stage of resistance R2 other end coupling capacitance C1 one end, triode N3 colelctor electrode and triode N5, triode N3,
N4 base stage is connected, and triode N4 emitter stage is grounded by resistance R4, the resistance R5 other end coupling capacitance C1 other end,
Triode N5 colelctor electrode and triode N6 base stage, triode N3, N5, N6 grounded emitter.
6. the drive circuit of electronic device as claimed in claim 1, it is characterised in that：The waveform generating unit includes triangle
The waveform converting unit of ripple generating unit and coupling triangular wave generating unit.
7. the drive circuit of electronic device as claimed in claim 6, wherein the triangular wave generating unit includes the second electric current
Source TC2, resistance R6-R8, electric capacity C2, C3, diode D1 and first comparator IC1, wherein the second current source TC2 input coupling
Connect voltage transformation voltage regulation unit output end, output end coupling resistance R6, electric capacity C2 one end and first comparator IC1 output 4
Pin；Resistance R6 other end coupling capacitance C3 one end and the first comparator IC1 pin of anti-phase input 1；Resistance R7 one end coupling
Meet voltage transformation voltage regulation unit output end, other end coupling resistance R8 one end, diode D1 positive pole and first comparator IC1
The pin of homophase input 2；The diode D1 other end coupling first comparator IC1 pin of output 5；Electric capacity C2, C3 and resistance R8's
The other end is grounded.
8. the drive circuit of electronic device as claimed in claim 6, it is characterised in that：The waveform converting unit includes resistance
R9, R10 and the second comparator IC2；Wherein resistance R9 one end coupling voltage transformation voltage regulation unit output end, other end coupling electricity
Hinder R10 one end and the second comparator IC2 inverting input；Second comparator IC2 in-phase input end coupling first is compared
The device IC1 pin of output 4, output end are used for the signal input part for coupling driver element；Resistance R10 other end ground connection.
9. the drive circuit of electronic device as claimed in claim 1, it is characterised in that：The driver element includes signal code
The output of amplifier IC3, amplifier Q1 and continued flow tube D2, wherein signal code amplifier IC3 1 pin coupling waveform generating unit
End, 2 pin receive input power, 4 pin ground connection, 3 pin coupling amplifier Q1 base stages；Amplifier Q1 colelctor electrode coupling continued flow tube D2's
Positive pole, and as output end coupling electronic device signal input part, grounded emitter；Continued flow tube D2 negative pole coupling input electricity
Source.
10. the drive circuit of electronic device as claimed in claim 9, it is characterised in that：Also include a voltage-regulator diode DZ, institute
Voltage-regulator diode DZ is stated to connect with the continued flow tube D2, and voltage-regulator diode DZ negative pole coupling continued flow tube D2 negative pole.
11. the drive circuit of the electronic device as described in claim any one of 1-10, it is characterised in that：The circuit integration packaging
In in a chip, and 1 pin of the chip is used to receive input power, and 2 pin are used to be grounded, and 3 pin connect driver element output end, are used for
Driving power is provided for electronic device.
12. a kind of drive system of electronic device, including drive circuit and buzzer as described in claim any one of 1-10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710934420.0A CN107704006B (en) | 2017-10-10 | 2017-10-10 | Driving circuit of electronic device |
| US15/894,072 US10629180B2 (en) | 2017-10-10 | 2018-02-12 | Driving circuit for electronic device and associated system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710934420.0A CN107704006B (en) | 2017-10-10 | 2017-10-10 | Driving circuit of electronic device |
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| CN107704006A true CN107704006A (en) | 2018-02-16 |
| CN107704006B CN107704006B (en) | 2022-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710934420.0A Active CN107704006B (en) | 2017-10-10 | 2017-10-10 | Driving circuit of electronic device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108470558A (en) * | 2018-05-30 | 2018-08-31 | 杭州百隆电子有限公司 | A kind of buzzer drive circuit and drive system |
| CN110335579A (en) * | 2019-08-16 | 2019-10-15 | 深圳南云微电子有限公司 | A kind of driving circuit of buzzer |
| CN110346015A (en) * | 2019-08-05 | 2019-10-18 | 杭州微联智控科技有限公司 | Electric pole type water logging detection circuit and water sensor |
| CN113067991A (en) * | 2021-03-30 | 2021-07-02 | 中国科学院长春光学精密机械与物理研究所 | Self-defined waveform driving circuit |
| CN110346015B (en) * | 2019-08-05 | 2024-05-28 | 杭州微联智控科技有限公司 | Electrode type water immersion detection circuit and water immersion sensor |
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| CN113067991A (en) * | 2021-03-30 | 2021-07-02 | 中国科学院长春光学精密机械与物理研究所 | Self-defined waveform driving circuit |
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| CN107704006B (en) | 2022-12-23 |
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