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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- 230000033228 biological regulation Effects 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 42
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 230000000087 stabilizing effect Effects 0.000 claims description 16
- 230000006641 stabilisation Effects 0.000 claims description 8
- 238000011105 stabilization Methods 0.000 claims description 8
- 230000005669 field effect Effects 0.000 claims description 6
- 230000001131 transforming effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 9
- 230000008878 coupling Effects 0.000 abstract description 8
- 238000010168 coupling process Methods 0.000 abstract description 8
- 238000005859 coupling reaction Methods 0.000 abstract description 8
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- 230000010355 oscillation Effects 0.000 description 1
- 238000012358 sourcing Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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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 invention relates to the field of electronic driving chips, in particular to a driving circuit of an electronic device.
Background
The existing buzzer driving circuit is often driven by discrete components, and has the defects of large circuit volume and inconvenient production and debugging. In addition, the voltage working range is too narrow, and the voltage working range is generally limited to below 5V.
Disclosure of Invention
In view of one or more problems in the prior art, the present invention is directed to an electronic device (e.g., buzzer) driving circuit with a wide operating voltage range, without requiring peripheral components, and with stable and reliable operation.
In order to solve the above problems, an aspect of the present invention proposes:
a driving circuit of an electronic device comprises a voltage conversion and voltage stabilization unit, a waveform generation unit and a driving unit, wherein
The input end of the voltage conversion and stabilization unit is used for receiving an input power supply;
the input end of the waveform generating unit is coupled with the output end of the voltage conversion and voltage stabilization unit, and the output end of the waveform generating unit provides a signal with periodically changed waveform;
the signal input end of the driving unit is coupled with the output end of the waveform generating unit, the power supply input end of the driving unit is used for receiving an input power supply, and the output end of the driving unit is used for providing a driving power supply for the electronic device.
Optionally, the electronic device is a buzzer.
Optionally, the voltage converting and stabilizing unit includes a first current source TC1 and a bandgap reference source, an input terminal of the first current source TC1 receives an input power supply, an output terminal of the first current source is coupled to the bandgap reference source, and an output terminal of the bandgap reference source is coupled to an input terminal of the waveform generating unit.
Optionally, the first current source TC1 includes PNP-type transistors P2 and P3, NPN-type transistors N1 and N2, a field-effect transistor J1, and a resistor R1; wherein the emitting electrodes of the triodes P2 and P3 receive input power supply, and the bases are mutually coupled and used as bias current output ends; the collector of the triode P2 is coupled with the collector of the triode N1, the collector of the triode P3 is coupled with the collector of the triode N2, the bases of the triodes N1 and N2 are connected, the emitter of the triode N1 is grounded through a resistor R1, and the emitter of the triode N2 is grounded; the drain of the fet J1 receives the input power, the source is coupled to the collectors of the transistors P3 and N2, and the gate is grounded.
Optionally, the bandgap reference source includes a PNP transistor P1, an NPN transistor N3-N6, resistors R2-R5, and a capacitor C1, wherein an emitter of the transistor P1 receives an input power, a base of the transistor P1 is coupled to the bias current output terminal, and a collector of the transistor P1 is coupled to one end of the resistors R2, R3, and R5 and a collector of the transistor N6 and serves as a bandgap reference source output terminal; the other end of the resistor R3 is coupled with the collector of the triode N4, the other end of the resistor R2 is coupled with one end of the capacitor C1, the collector of the triode N3 and the base of the triode N5, the bases of the triodes N3 and N4 are connected, the emitter of the triode N4 is grounded through a resistor R4, the other end of the resistor R5 is coupled with the other end of the capacitor C1, the collector of the triode N5 and the base of the triode N6, and the emitters of the triodes N3, N5 and N6 are grounded.
Optionally, the waveform generating unit includes a triangle wave generating unit and a waveform converting unit coupled to the triangle wave generating unit, the triangle wave generating unit includes a second small current source TC2, resistors R6-R8, capacitors C2, C3, a diode D1, and a first comparator IC1, wherein an input terminal of the second small current source TC2 is coupled to an output terminal of the voltage conversion voltage stabilizing unit, and an output terminal of the second small current source TC2 is coupled to one terminal of the resistor R6, one terminal of the capacitor C2, and 4 pins of an output terminal of the first comparator IC 1; the other end of the resistor R6 is coupled to one end of the capacitor C3 and the inverting input 1 pin of the first comparator IC 1; one end of the resistor R7 is coupled to the output end of the voltage conversion and regulation unit, and the other end is coupled to one end of the resistor R8, the anode of the diode D1, and the non-inverting input 2 pin of the first comparator IC 1; the other end of the diode D1 is coupled to the output pin 5 of the first comparator IC 1; the other ends of the capacitors C2 and C3 and the resistor R8 are grounded.
Optionally, the waveform conversion unit includes resistors R9, R10 and a second comparator IC 2; one end of the resistor R9 is coupled to the output end of the voltage converting and stabilizing unit, and the other end is coupled to one end of the resistor R10 and the inverting input end of the second comparator IC 2; the non-inverting input terminal of the second comparator IC2 is coupled to the output pin 4 of the first comparator IC1, and the output terminal is coupled to the signal input terminal of the driving unit; the other end of the resistor R10 is connected to ground.
Optionally, the driving unit includes a signal current amplifier IC3, an amplifier Q1, and a freewheeling tube D2, where pin 1 of the signal current amplifier IC3 is coupled to the output terminal of the waveform generating unit, pin 2 receives the input power, pin 4 is grounded, and pin 3 is coupled to the base of the amplifier Q1; the collector of the amplifier Q1 is coupled with the anode of the follow current tube D2, and is used as the output end to be coupled with the signal input end of the electronic device, and the emitter is grounded; the negative pole of the follow current tube D2 is coupled to the input power source.
Optionally, the driving unit further includes a zener diode DZ, the zener diode DZ is connected in series with the freewheeling tube D2, and a cathode of the zener diode DZ is coupled to a cathode of the freewheeling tube D2.
Optionally, the circuit is integrated and packaged in a chip, and pin 1 of the chip is used for receiving an input power supply, pin 2 is used for grounding, and pin 3 is connected to an output end of the driving unit and used for providing a driving power supply for the electronic device.
Another aspect of the present invention provides a driving system of an electronic device, including the driving circuit and the buzzer as described in any one of the above cases.
The invention has the beneficial effects that: the range of working voltage is wide, and the requirement of the range of working voltage of 1.8-36V can be met simultaneously; no additional components are arranged on the periphery, the production and debugging are simple and easy, and the cost is saved; meanwhile, the driving circuit has a certain function of resisting reverse connection of the power supply and the ground, and the circuit cannot be damaged due to the reverse connection between the power supply and the ground below 18V.
Drawings
Fig. 1 is a schematic diagram of a conventional simple buzzer driving circuit.
Fig. 2 is a schematic diagram of a unit composition and a coupling relationship of a driving circuit according to an embodiment of the invention.
Fig. 3 is a circuit diagram of a bandgap reference circuit according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of the voltage converting and stabilizing unit of fig. 2 according to a preferred embodiment of the present invention.
Fig. 5 is a circuit diagram and a waveform diagram of a triangle wave generating unit according to an embodiment of the invention.
Fig. 6 is a circuit diagram and a waveform diagram of the triangle wave generating unit in fig. 2 according to a preferred embodiment of the present invention.
Fig. 7 is a circuit diagram of the triangle wave generating unit and the waveform converting circuit in fig. 2 according to a preferred embodiment of the present invention.
Fig. 8 is a circuit coupling diagram of a driving circuit according to an embodiment of the invention.
Fig. 9 is a circuit coupling diagram of another embodiment of the driving circuit of the invention.
Fig. 10 is a diagram of an exemplary application of a driving circuit according to an embodiment of the present invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The description in this section is for several exemplary embodiments only, and the present invention is not limited only to the scope of the embodiments described. It is within the scope of the present disclosure and protection that the same or similar prior art means and some features of the embodiments may be interchanged.
"coupled" in this specification includes direct connection and also includes indirect connection, such as connection through some active device, passive device, or electrically conductive medium.
A buzzer is a common sounding element, and a direct current voltage (active buzzer) or a square wave (passive buzzer) is applied to two ends of the buzzer to sound. As shown in fig. 1, in the conventional driving circuit of the buzzer, a transistor Q1 functions as a switch, and the high level of the base electrode makes the transistor conduct in saturation, so that the buzzer sounds; and the triode is closed by the low level of the base electrode, and the buzzer stops sounding. In addition, since the buzzer is essentially an inductive element, the current cannot be transient, and therefore a freewheeling diode is necessary to provide freewheeling. Otherwise, a spike voltage of several tens of volts may be generated across the buzzer, possibly damaging the transistor and disturbing other parts of the overall circuit system.
The existing buzzer driving circuit or driving chip is not easy to install and debug due to the incomplete design and the need of coupling extra discrete components in use.
In view of the above, as shown in fig. 2, the present invention provides a driving circuit, including a voltage converting and voltage stabilizing unit, a waveform generating unit and a driving unit, wherein an input terminal of the voltage converting and voltage stabilizing unit is used for receiving an input power; the input end of the waveform generating unit is coupled with the output end of the voltage conversion and voltage stabilization unit, and the output end of the waveform generating unit provides a signal with periodically changed waveform; the signal input end of the driving unit is coupled with the output end of the waveform generating unit, the power supply input end of the driving unit is used for receiving an input power supply, and the output end of the driving unit is used for providing a driving power supply for the electronic device.
By adopting the design, the whole drive circuit has clear and complete functions, is not required to be coupled with additional peripheral components during use, is simple and easy to produce and debug, and saves the cost.
In an embodiment of the present invention, the voltage converting and stabilizing unit includes a first small current source TC1 and a bandgap reference source, wherein an input terminal of the first small current source TC1 receives an input power source, an output terminal of the first small current source is coupled to the bandgap reference source, and an output terminal of the bandgap reference source is coupled to an input terminal of the waveform generating unit.
The technical solution of the present invention is further described in detail by the following specific embodiments with reference to the accompanying drawings.
Fig. 3 is a circuit diagram of a universal bandgap reference source according to an embodiment of the present invention. The circuit comprises three second-type triodes N7, N8 and N9, resistors R6, R7 and R8, wherein one ends of the resistors R6 and R7 are coupled with the output end of a current source, the other end of the resistor R6 is coupled with the collector of a triode N7, the other end of the resistor R7 is coupled with the collector of a triode N8 and the base of a triode N9, the bases of the triodes N7 and N8 are connected with the collector of a triode N7, the emitter of the triode N8 is grounded through a resistor R8, the collector of the triode N9 is coupled with the output end of a band-gap reference source, and the emitters of the triodes N7 and N9 are grounded. Wherein,
wherein Ie7, Ie8, Ae7 and Ae8 are emitter current and effective emitter area of N7 and N8 tubes respectively,
Vref＝VBE9+(ΔVBE/R8+IB9)*R7
IB9＝Ic9/β
ΔIB9＝ΔIc9/β＝ΔIo/β
ΔVref＝ΔIB9*R7＝(ΔIo/β)*R7
in the formula IB9Base current of N9 transistor, collector current of N9 transistor for Ic9, and amplification factor of NPN transistor for β, VBE9Is a negative temperature coefficient, and Δ VBEFor positive temperature coefficients, theoretically, zero temperature coefficient for Vref can be achieved by adjusting the ratios of Ae7, Ae8 and R7, R8.
However, the above circuit has the following disadvantages: the redundant current generated by the start-up and bias circuit Io is absorbed by the N9 transistor, i.e., the Ic9 varies with the change of Io, and the magnitude of Ie9 and the base current I of the N9 transistorB9Having a direct relationship, IB9The change in magnitude causes the voltage across the R7 to change. This results in Vref varying with Io, i.e., Vref current linearity is poor.
Therefore, in order to improve the current linearity and stability of the bandgap reference source, the invention further improves the bandgap reference source in the previous embodiment, and provides a more preferable voltage conversion and voltage regulation unit.
In a preferred embodiment, the voltage converting and stabilizing unit comprises a bipolar band-gap reference unit, a current source unit and a redundant current absorbing unit, wherein the current source unit and the redundant current absorbing unit are coupled with the band-gap reference unit; the current source unit is used for providing a current source for the band gap reference unit; the band-gap reference unit is used for providing a band-gap reference voltage; the redundant current absorption unit is used for absorbing redundant current in the current source and improving the linearity and stability of current output by the band-gap reference source circuit. Wherein the transistors in the bipolar bandgap reference unit are bipolar transistors.
Fig. 4 is a circuit coupling diagram according to an embodiment of the present invention. The band-gap reference unit comprises three second-type triodes N3, N4 and N5, resistors R2, R3 and R4, wherein one ends of the resistors R2 and R3 are coupled with the output end of the band-gap reference unit, the other end of the resistor R3 is coupled with a collector of a triode N4, the other end of the resistor R2 is coupled with a collector of a triode N3 and a base of the triode N5, bases of the triodes N3 and N4 are connected with a collector of the triode N4, an emitter of the triode N4 is grounded through the resistor R4, a collector of the triode N5 is coupled with the output end of the band-gap reference unit, and emitters of the triodes N3 and N5 are grounded.
In a preferred embodiment, the excess current sinking unit includes a second type transistor N6, a collector of the transistor N6 is coupled to the output terminal of the current sourcing unit, a base of the transistor N3526 is coupled to the collector of the transistor N5, and an emitter of the transistor N is grounded.
As a further preferred embodiment, to further improve the current linearity and stability of the output terminal, the bandgap reference unit further includes a resistor R5 and a capacitor C1, wherein one end of the resistor R5 is coupled to the output terminal of the bandgap reference unit, the other end of the resistor R5 is coupled to one end of the capacitor C1 and the collector of the transistor N5, and the other end of the capacitor C1 is coupled to the collector of the transistor N3 and the base of the transistor N5.
On the other hand, in the present embodiment, the current source circuit includes a first type transistor P1 and a current bias circuit, wherein an emitter of the first type transistor P1 is coupled to the input power source, a base thereof is coupled to the current bias circuit, and a collector thereof is used for providing a current source.
As a preferred embodiment, the current bias circuit includes a start-up circuit and a bias circuit for low voltage start-up.
The starting circuit comprises a field effect transistor J1 and a second type triode N2, wherein the drain electrode of the field effect transistor J1 is coupled with an input power supply, the source electrode is coupled with the collector electrode and the base electrode of the triode N2, the grid electrode is grounded, and the emitting electrode of the triode N2 is grounded.
The bias circuit comprises a first type triode P2, a P3, a second type triode N1 and a resistor R1, wherein emitting electrodes of the triodes P2 and P3 are coupled with an input power supply, bases of the triodes P2 and P3 are connected with a collector electrode of the triode P2, a collector electrode of the triode N1 is coupled with a collector electrode of the triode P2, the base electrode is coupled with a base electrode and a collector electrode of the triode N2, the emitting electrode is grounded through the resistor R1, and a collector electrode of the triode P3 is coupled with a source electrode of a field effect transistor J1 and a collector electrode and a base electrode of the triode N2.
In the bandgap reference cell of the circuit:
Vref＝VBE3+(ΔVBE/R4+IB3)*R3
IB3＝Ic3/β＝((Vref-VBE5)/R2)/β
ΔVref＝ΔIB3*R3≈0
in the formula IB3The reference voltage Vref with a theoretical zero temperature coefficient can be obtained by adjusting the emitter area ratio of N3 tubes and N4 tubes and the resistance ratio of R3 and R4, wherein the base current of the N3 tube is Ic3, the collector current of the N3 tube is Ic3, the amplification factor of the NPN β is β, the amplification factor of the NPN tube is Ie3, Ie4, Ae3 and Ae4 are respectively the emitter current and the effective emitter area of the N3 and N4 tubes.
Meanwhile, the excessive current Ip coming down from the P1 tube is finally absorbed by the N6, when the collector current of the P1 tube changes, the base current Ib6 of the N6 tube changes, but the change amount of the change amount is small in proportion to the collector current Ic5 of the N5 tube, and the change amount is negligible in reaction to the base current Ib5 of the N5 tube, so the final Vref is insensitive to the change of the collector current Ic6 of the N6 tube, and the current linearity and stability of the Vref are greatly improved.
On the other hand, the J1 tube is a JFET tube and is connected to a power ground through the N2 tube, the JFET tube can be started only by about 0.1V, the starting voltage of the N2 tube is about 0.6V, so that the power is switched on, and the current starts to be provided above 0.7V and is used as a starting signal, so that the whole circuit is started, and normal starting under low power voltage is realized.
Meanwhile, the collector of the P1 tube serves as an output terminal, outputting a constant current. The voltage of the band-gap reference source is set at 1.25V, and the saturation voltage drop of the P1 tube is generally about 0.25V, so that when the voltage of the connected power supply of the whole circuit is 1.5V, the stable 1.25V reference voltage can be provided. Meanwhile, stable band-gap reference voltage can be provided for the waveform generating unit between 1.5-36V of input power supply voltage, and the working stability of the whole driving circuit is ensured.
In one embodiment, as shown in fig. 4, the current source circuit may also be referred to as a first current source TC1, and the bandgap reference unit and the excess current sink unit may be referred to as a bandgap reference source, such that the voltage transforming and voltage stabilizing unit includes a first current source TC1 and a bandgap reference source, an input terminal of the first current source TC1 is coupled to the input power source, an output terminal of the first current source is coupled to the bandgap reference source, and an output terminal of the bandgap reference source is coupled to an input terminal of the waveform generating unit. The first current source TC1 comprises a first type triode P1, P2 and P3, a second type triode N1 and N2, a field effect transistor J1 and a resistor R1; wherein the emitting electrodes of the triodes P2 and P3 receive input power supply, and the bases are mutually coupled and used as bias current output ends; an emitter electrode of the triode P1 receives an input power supply, a base electrode of the triode P1 is coupled with a bias current output end, and a collector electrode of the triode P1 is used as an output end of the first current source TC 1; the collector of the triode P2 is coupled with the collector of the triode N1, the collector of the triode P3 is coupled with the collector of the triode N2, the bases of the triodes N1 and N2 are connected, the emitter of the triode N1 is grounded through a resistor R1, and the emitter of the triode N2 is grounded; the drain of the fet J1 receives the input power, the source is coupled to the collectors of the transistors P3 and N2, and the gate is grounded. The band-gap reference source comprises a second type triode N3-N6, resistors R2-R5 and a capacitor C1, wherein one ends of the resistors R2, R3 and R5 and a collector of the triode N6 are coupled with an output end of a first current source TC1 and are used as an output end of the band-gap reference source; the other end of the resistor R3 is coupled with the collector of the triode N4, the other end of the resistor R2 is coupled with one end of the capacitor C1, the collector of the triode N3 and the base of the triode N5, the bases of the triodes N3 and N4 are connected, the emitter of the triode N4 is grounded through a resistor R4, the other end of the resistor R5 is coupled with the other end of the capacitor C1, the collector of the triode N5 and the base of the triode N6, and the emitters of the triodes N3, N5 and N6 are grounded.
In a preferred embodiment of the present invention, the waveform generating unit includes a triangle wave generating unit and a waveform converting unit coupled to the triangle wave generating unit, wherein the triangle wave generating unit is configured to generate a periodic triangle wave signal, and the waveform converting unit is configured to convert the triangle wave signal into a square wave signal.
Fig. 5 is a schematic diagram of a circuit of a general triangular wave generating unit and a triangular wave signal generated by the general triangular wave generating unit according to an embodiment of the invention.
The triangular wave generating unit includes a second current source TC2 receiving an input power, a capacitor C3 coupled between an output terminal of the current source TC2 and a power ground, resistors R4 and R5 connected in series for providing a reference voltage, and a comparator IC2 and a diode D2. The resistor R4 has a first terminal coupled to the input power source, a second terminal coupled to the first terminal of the resistor R5 and serving as a reference voltage output terminal, and a second terminal of the resistor R5 connected to ground. The inverting input terminal 1 of the comparator IC2 is coupled to the output terminal of the current source TC2, the non-inverting input terminal 2 is coupled to the second terminal of the resistor R4, the output terminal 4 is coupled to the output terminal of the current source TC2 and serves as the output terminal of the waveform generating circuit, and the output terminal 5 is coupled to the first terminal of the resistor R5 through the diode D2 arranged in the reverse direction.
The principle is as follows: when the capacitor C3 is charged to the peak voltage Vp, the comparator IC2 flips, and its 4 th pin and 5 th pin start to draw current, that is, the IC2 pin falls to 0.7V, the capacitor C3 starts to discharge, and theoretically, when the capacitor C3 falls to the valley voltage Vg (0.7V), the comparator IC2 flips again, the 4 th pin and the 5 th pin are cut off, and the capacitor C3 starts to charge again. This is a period of oscillation of the triangular wave.
The disadvantages of this design are: the 4-pin discharge rate of the IC2 is fast, and the IC2 has a certain delay, so that the valley value Vg of the triangular wave has a certain overdischarge, and the valley value Vg of the triangular wave fluctuates.
In order to overcome the above-mentioned drawbacks, the triangular wave generating unit of the present invention is further improved to provide a triangular wave generating circuit, comprising:
a current source, an input end of which receives an input power supply;
the first capacitor is coupled between the output end of the current source and the power ground;
the comparison unit is provided with a first input end, a second input end and an output end, wherein the first input end is used for receiving a periodically-changed signal, the second input end is used for receiving a reference voltage, and the output end is used for providing a triangular wave;
a first resistor, a first end of which is coupled to the output end of the current source, and a second end of which is coupled to the first input end of the comparison unit; and
and the second capacitor is coupled between the second end of the first resistor and the power ground, wherein the first resistor and the second capacitor are used for fully discharging the first capacitor.
As a preferred embodiment, the triangular waveform generating circuit further includes a reference voltage circuit, which includes a second resistor and a third resistor, wherein a first end of the second resistor is coupled to the input power source, a second end of the second resistor is coupled to a first end of the third resistor and serves as a reference voltage output end, and a second end of the third resistor is grounded.
As a preferred embodiment, the comparing unit includes a comparator and a diode, wherein an inverting input terminal of the comparator is coupled to the second terminal of the first resistor, a non-inverting input terminal of the comparator is coupled to the output terminal of the reference voltage circuit, and an output terminal of the comparator is coupled to the output terminal of the current source, and the diode is reversely disposed and coupled to the output terminal of the reference voltage circuit.
By adopting the design, the resistor and the capacitor are arranged on the periodic signal input end circuit of the comparison unit, so that the discharge condition of the original capacitor is improved, the original capacitor can be fully discharged, the valley value of the triangular wave can be reduced to 0 level through full discharge, the peak-to-peak voltage of the triangular wave is increased, the consistency of the circuit is improved, and the temperature characteristic of the circuit is improved.
The triangular wave waveform generating circuit described above will be described in further detail with reference to the drawings and specific embodiments.
Fig. 6 is a schematic diagram of a circuit coupling relationship and a waveform generation of the triangle wave generating circuit according to a preferred embodiment. The triangular wave generating circuit specifically comprises:
a current source TC2 for receiving input power, a first capacitor C1 coupled between the output terminal of the current source TC2 and ground; a first terminal of the first resistor R1 is coupled to the output terminal of the current source TC2, and a second terminal of the first resistor R1 is coupled to the first input terminal of the comparison unit; a second capacitor C2 coupled between the second terminal of the first resistor R1 and power ground, and a comparison unit having a first input terminal, a second input terminal, and an output terminal. The first input end of the comparison unit is used for receiving a periodically-changed signal, the second input end of the comparison unit is used for receiving a reference voltage, and the output end of the comparison unit is used for providing a triangular wave; the first resistor R1 and the second capacitor C2 are used to fully discharge the first capacitor C1.
In addition, the circuit also comprises a second resistor R2 and a third resistor R3, wherein the first end of the second resistor R2 is coupled to the input power source, the second end is coupled to the first end of the third resistor R3 and serves as a reference voltage output end, and the second end of the third resistor R3 is grounded.
As a preferred embodiment, the comparing unit specifically includes a comparator IC1 and a diode D1, wherein pin 1 of the inverting input terminal of the comparator IC1 is coupled to the second terminal of the first resistor R1, and pin 2 of the non-inverting input terminal is coupled to the output terminal of the reference voltage circuit; the output terminal 4 of the comparator IC1 is coupled to the output terminal of the current source and serves as the output terminal of the waveform generation circuit, and the output terminal 5 is coupled to the output terminal of the reference voltage circuit through the diode D1 arranged in the reverse direction.
The advantages of this design are as follows: a resistor R1 and a capacitor C2 are additionally arranged in a discharge loop, and the pin 1 of the comparator IC1 has lag in detecting the potential of the pin C1, so that the capacitor C1 can be fully discharged. Therefore, the valley value of the generated triangular wave can be reduced to 0 level through full discharge, the peak voltage of the triangular wave is increased, and the consistency of the circuit is improved. Meanwhile, the wave trough reaches the level 0, so that fluctuation is not generated along with the change of the power supply voltage and the temperature, and the temperature characteristic of the circuit is further improved.
On the other hand, as shown in fig. 7, in the above embodiment, the waveform converting unit preferably includes resistors R4, R5 and a second comparator IC 2; one end of the resistor R4 is coupled to the output end of the voltage converting and stabilizing unit, and the other end is coupled to one end of the resistor R5 and the inverting input end of the second comparator IC 2; the non-inverting input terminal of the second comparator IC2 is coupled to the output pin 4 of the first comparator IC1, and the output terminal is coupled to the signal input terminal of the driving unit; the other end of the resistor R5 is connected to ground.
Fig. 8 is a schematic circuit diagram showing the entire driving circuit to which the above preferred embodiment is applied. The driving unit comprises a signal current amplifier IC3, an amplifier Q1 and a follow current tube D2, wherein a pin 1 of the signal current amplifier IC3 is coupled with the output end of the waveform generating unit, a pin 2 receives an input power supply, a pin 4 is grounded, and a pin 3 is coupled with the base electrode of the amplifier Q1; the collector of the amplifier Q1 is coupled with the anode of the follow current tube D2, and is used as the output end to be coupled with the signal input end of the electronic device, and the emitter is grounded; the negative pole of the follow current tube D2 is coupled to the input power source.
In the circuit, when the power supply is reversely connected with the GND, a diode characteristic is formed between the GND and the 3 pins, the withstand voltage is about 0.7V, the conventional freewheel diode withstand voltage is only 0.7V, and therefore the reverse withstand voltage between the GND and the power supply is only 1.4V. When the voltage of the reverse connection is relatively large, the circuit is easy to damage.
In view of this, as shown in fig. 9, in a further preferred embodiment of the driving circuit of the present invention, a zener diode DZ is added in the driving unit, the zener diode DZ is connected in series with the freewheeling tube D2, and the cathode of the zener diode DZ is coupled to the cathode of the freewheeling tube D2.
After the improvement, the withstand voltage between the 3 pins and the power pin is improved to about 14V, so that the reverse conducting withstand voltage between GND and the power pin reaches about 14.7V, and the reverse damage withstand voltage reaches 18V. In addition, in practical application, after the diode DZ is connected in series, compared with the original mode of single diode freewheeling, the loudness of the same buzzer is also improved to a certain extent.
As shown in fig. 8 and fig. 9, the driving circuit of the present invention is integrally packaged in a chip, and pin 1 of the chip is used for receiving an input power, pin 2 is used for grounding, and pin 3 is connected to an output terminal of the driving unit, and is used for providing a driving power for an electronic device. A typical application of this is shown in figure 10. The chip has wide working voltage range, no need of additional components at the periphery, simple and easy production and debugging, low cost, certain power ground resistance reverse connection function, capability of meeting the requirements of most users in the market, and good practicability and market prospect.
As shown in fig. 8, the triangle wave generating unit includes a second current source TC2, resistors R6-R8, capacitors C2, C3, a diode D1, and a first comparator IC1, wherein an input terminal of the second current source TC2 is coupled to an output terminal of the voltage transforming and stabilizing unit, and an output terminal of the second current source TC2 is coupled to one terminal of the resistor R6, one terminal of the capacitor C2, and 4 pins of an output terminal of the first comparator IC 1; the other end of the resistor R6 is coupled to one end of the capacitor C3 and the inverting input 1 pin of the first comparator IC 1; one end of the resistor R7 is coupled to the output end of the voltage conversion and regulation unit, and the other end is coupled to one end of the resistor R8, the anode of the diode D1, and the non-inverting input 2 pin of the first comparator IC 1; the other end of the diode D1 is coupled to the output pin 5 of the first comparator IC 1; the other ends of the capacitors C2 and C3 and the resistor R8 are grounded.
The waveform conversion unit comprises resistors R9, R10 and a second comparator IC 2; one end of the resistor R9 is coupled to the output end of the voltage converting and stabilizing unit, and the other end is coupled to one end of the resistor R10 and the inverting input end of the second comparator IC 2; the non-inverting input terminal of the second comparator IC2 is coupled to the output pin 4 of the first comparator IC1, and the output terminal is coupled to the signal input terminal of the driving unit; the other end of the resistor R10 is connected to ground.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (12)
1. A driving circuit of an electronic device comprises a voltage conversion and voltage stabilization unit, a waveform generation unit and a driving unit, wherein
The input end of the voltage conversion and stabilization unit is coupled with an input power supply;
the input end of the waveform generating unit is coupled with the output end of the voltage conversion and voltage stabilization unit, and the output end of the waveform generating unit provides a signal with periodically changed waveform;
the signal input end of the driving unit is coupled with the output end of the waveform generating unit, the power supply input end of the driving unit is used for receiving an input power supply, and the output end of the driving unit is used for providing a driving power supply for the electronic device.
2. A drive circuit of an electronic device according to claim 1, characterized in that: the electronic device includes a buzzer.
3. A drive circuit of an electronic device according to claim 1, characterized in that: the voltage conversion and voltage stabilization unit comprises a first current source TC1 and a band-gap reference source, wherein the input end of the first current source TC1 is coupled with an input power supply, the output end of the first current source TC1 is coupled with the band-gap reference source, and the output end of the band-gap reference source is coupled with the input end of the waveform generation unit.
4. A drive circuit of an electronic device according to claim 3, characterized in that: the first current source TC1 comprises a first type triode P1, P2 and P3, a second type triode N1 and N2, a field effect transistor J1 and a resistor R1; wherein the emitting electrodes of the triodes P2 and P3 receive input power supply, and the bases are mutually coupled and used as bias current output ends; an emitter electrode of the triode P1 receives an input power supply, a base electrode of the triode P1 is coupled with a bias current output end, and a collector electrode of the triode P1 is used as an output end of the first current source TC 1; the collector of the triode P2 is coupled with the collector of the triode N1, the collector of the triode P3 is coupled with the collector of the triode N2, the bases of the triodes N1 and N2 are connected, the emitter of the triode N1 is grounded through a resistor R1, and the emitter of the triode N2 is grounded; the drain of the fet J1 receives the input power, the source is coupled to the collectors of the transistors P3 and N2, and the gate is grounded.
5. A drive circuit of an electronic device according to claim 3, characterized in that: the band-gap reference source comprises a second type triode N3-N6, resistors R2-R5 and a capacitor C1, wherein one ends of the resistors R2, R3 and R5 and a collector of the triode N6 are coupled with an output end of a first current source TC1 and are used as an output end of the band-gap reference source; the other end of the resistor R3 is coupled with the collector of the triode N4, the other end of the resistor R2 is coupled with one end of the capacitor C1, the collector of the triode N3 and the base of the triode N5, the bases of the triodes N3 and N4 are connected, the emitter of the triode N4 is grounded through a resistor R4, the other end of the resistor R5 is coupled with the other end of the capacitor C1, the collector of the triode N5 and the base of the triode N6, and the emitters of the triodes N3, N5 and N6 are grounded.
6. A drive circuit of an electronic device according to claim 1, characterized in that: the waveform generating unit comprises a triangular wave generating unit and a waveform converting unit coupled with the triangular wave generating unit.
7. The driving circuit of the electronic device according to claim 6, wherein the triangle wave generating unit comprises a second current source TC2, resistors R6-R8, capacitors C2, C3, a diode D1, and a first comparator IC1, wherein an input terminal of the second current source TC2 is coupled to an output terminal of the voltage transforming and stabilizing unit, and an output terminal of the second current source TC2 is coupled to one terminal of the resistor R6, the capacitor C2, and an output terminal of the first comparator IC1 at pin 4; the other end of the resistor R6 is coupled to one end of the capacitor C3 and the inverting input 1 pin of the first comparator IC 1; one end of the resistor R7 is coupled to the output end of the voltage conversion and regulation unit, and the other end is coupled to one end of the resistor R8, the anode of the diode D1, and the non-inverting input 2 pin of the first comparator IC 1; the other end of the diode D1 is coupled to the output pin 5 of the first comparator IC 1; the other ends of the capacitors C2 and C3 and the resistor R8 are grounded.
8. A drive circuit of an electronic device according to claim 6, characterized in that: the waveform conversion unit comprises resistors R9, R10 and a second comparator IC 2; one end of the resistor R9 is coupled to the output end of the voltage converting and stabilizing unit, and the other end is coupled to one end of the resistor R10 and the inverting input end of the second comparator IC 2; the non-inverting input terminal of the second comparator IC2 is coupled to the output pin 4 of the first comparator IC1, and the output terminal is coupled to the signal input terminal of the driving unit; the other end of the resistor R10 is connected to ground.
9. A drive circuit of an electronic device according to claim 1, characterized in that: the driving unit comprises a signal current amplifier IC3, an amplifier Q1 and a follow current tube D2, wherein a pin 1 of the signal current amplifier IC3 is coupled with the output end of the waveform generating unit, a pin 2 receives an input power supply, a pin 4 is grounded, and a pin 3 is coupled with the base electrode of the amplifier Q1; the collector of the amplifier Q1 is coupled with the anode of the follow current tube D2, and is used as the output end to be coupled with the signal input end of the electronic device, and the emitter is grounded; the negative pole of the follow current tube D2 is coupled to the input power source.
10. A drive circuit of an electronic device according to claim 9, characterized in that: the voltage stabilizing diode DZ is connected with the afterflow tube D2 in series, and the cathode of the voltage stabilizing diode DZ is coupled with the cathode of the afterflow tube D2.
11. A drive circuit of an electronic device according to any one of claims 1 to 10, wherein: the circuit is integrated and packaged in a chip, and a pin 1 of the chip is used for receiving an input power supply, a pin 2 of the chip is used for grounding, and a pin 3 of the chip is connected with an output end of a driving unit and used for providing a driving power supply for an electronic device.
12. A driving system of an electronic device comprising the driving circuit according to any one of claims 1 to 10 and a buzzer.
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| 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 |
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| CN201710934420.0A CN107704006B (en) | 2017-10-10 | 2017-10-10 | Driving circuit of electronic device |
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| CN107704006B CN107704006B (en) | 2022-12-23 |
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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 |
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| CN107704006B (en) | 2022-12-23 |
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Address after: Room 501, 502, 601, 602, Building 7, 1217 Wenyi West Road, Cangqian Street, Yuhang District, Hangzhou City, Zhejiang Province Applicant after: HANGZHOU BOON ELECTRONIC Co.,Ltd. Address before: 310053 Zhuo Xin mansion 3820, South Ring Road, Binjiang District, Hangzhou, Zhejiang 301-309 Applicant before: HANGZHOU BOON ELECTRONIC Co.,Ltd. |
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Denomination of invention: A driving circuit for electronic devices Granted publication date: 20221223 Pledgee: Guotou Taikang Trust Co.,Ltd. Pledgor: HANGZHOU BOON ELECTRONIC Co.,Ltd. Registration number: Y2024980020905 |