CN108417193B - Electronic device driving circuit, high-resistance circuit thereof and driving method - Google Patents
Electronic device driving circuit, high-resistance circuit thereof and driving method Download PDFInfo
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- CN108417193B CN108417193B CN201810603267.8A CN201810603267A CN108417193B CN 108417193 B CN108417193 B CN 108417193B CN 201810603267 A CN201810603267 A CN 201810603267A CN 108417193 B CN108417193 B CN 108417193B
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
- G10K9/125—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means with a plurality of active elements
Abstract
The invention provides an electronic device driving circuit, comprising: the input end of the power circuit is coupled with an input power supply; the input end of the crystal oscillator signal generating circuit is coupled with the output end of the power supply circuit, and the output end is used for providing square wave signals; the first input end of the driving signal output circuit is coupled with the output end of the crystal oscillator signal generation circuit, the second input end of the driving signal output circuit is coupled with the input power supply, the first output end of the driving signal output circuit is coupled with the first end of the electronic device, and the second output end of the driving signal output circuit is coupled with the second end of the electronic device; and the input end of the high-resistance signal generation circuit is coupled with the crystal oscillator signal generation circuit, the output end of the high-resistance signal generation circuit is coupled with the third input end of the driving signal output circuit for providing a high-resistance signal, and the high-resistance signal controls the output signal of the output end of the driving signal output circuit to intermittently resonate. The driving circuit realizes the driving of an electronic device, particularly a piezoelectric buzzer, improves the sounding loudness of the buzzer, improves the power efficiency, has higher reliability and realizes the miniaturization of the system.
Description
Technical Field
The invention relates to the field of electronic circuits, in particular to an electronic device driving circuit and a high-resistance circuit thereof.
Background
The buzzer driving circuit is used for providing driving signals for buzzers in the sounding devices. A piezoelectric buzzer is a capacitive widely used buzzer, by attaching a piezoelectric material to two metal sheets. When pulse voltage is applied to the two ends of the piezoelectric material and the metal sheet, the buzzer generates mechanical deformation to make sound due to the inverse piezoelectric effect.
As a sound emitting device, the loudness of a buzzer is an important indicator.
Disclosure of Invention
In view of the needs in the prior art, an object of the present invention is to propose a driving circuit and a high-resistance circuit thereof aimed at improving the loudness of a piezoelectric buzzer.
In order to solve the above-described problems, an aspect of the present invention proposes an electronic device driving circuit including: the power supply circuit is provided with an input end and an output end, wherein the input end of the power supply circuit is coupled with an input power supply; the crystal oscillator signal generation circuit is provided with an input end and an output end, wherein the input end of the crystal oscillator signal generation circuit is coupled with the output end of the power supply circuit, and the output end of the crystal oscillator signal generation circuit is used for providing square wave signals; the driving signal output circuit is provided with a first input end, a second input end, a third input end and an output end, wherein the first input end of the driving signal output circuit is coupled with the output end of the crystal oscillator signal generating circuit, the second input end of the driving signal output circuit is used for being coupled with an input power supply, and the output end of the driving signal output circuit is used for being coupled with an electronic device; and the high-resistance signal generating circuit is provided with an input end and an output end, wherein the input end of the high-resistance signal generating circuit is coupled with the crystal oscillator signal generating circuit, the output end of the high-resistance signal generating circuit is coupled with the third input end of the driving signal output circuit for providing a high-resistance signal, and the high-resistance signal controls the output signal of the output end of the driving signal output circuit to intermittently resonate.
In one embodiment, the electronic device is a piezoelectric buzzer.
In one embodiment, the crystal oscillator signal generation circuit comprises: the sawtooth wave signal generating circuit is provided with an input end and an output end, wherein the input end of the sawtooth wave signal generating circuit is coupled with the output end of the power supply circuit, and the output end of the sawtooth wave signal generating circuit provides a sawtooth wave signal; the waveform conversion circuit is provided with a first input end, a second input end and an output end, wherein the first input end of the waveform conversion circuit is coupled with the output end of the power supply circuit, the second input end of the waveform conversion circuit is coupled with the output end of the sawtooth wave signal generating circuit, and the output end of the waveform conversion circuit provides square wave signals.
In one embodiment, an input terminal of the high-resistance signal generating circuit is coupled to an output terminal of the sawtooth signal generating circuit for receiving the sawtooth signal.
In one embodiment, the high-resistance signal generating circuit includes a comparing circuit that compares the reference signal with the signal at the input of the high-resistance signal generating circuit for generating the high-resistance signal.
In one embodiment, the square wave signal in a first state at a first level partially coincides with an active state of the high resistance signal and another partially coincides with an inactive state of the high resistance signal, wherein the active state of the high resistance signal is used to turn off the drive signal output circuit.
In one embodiment, a driving signal output circuit includes: the high-resistance control circuit is provided with a first input end, a second input end and a plurality of output ends, wherein the first input end of the high-resistance control circuit is coupled with the output end of the high-resistance signal generating circuit, the second input end of the high-resistance control circuit is coupled with the second input end of the driving signal output circuit, the high-resistance control circuit comprises a first transistor, and the control end of the first transistor is coupled with the output end of the high-resistance signal generating circuit; the push-pull dual-path output circuit is provided with a first input end, a second input end, a plurality of third input ends, a first output end and a second output end, wherein the first input end of the push-pull dual-path output circuit is coupled with the first input end of the driving signal output circuit, the second input end of the push-pull dual-path output circuit is coupled with the second input end of the driving signal output circuit, the plurality of third input ends of the push-pull dual-path output circuit are coupled with the plurality of output ends of the high-resistance control circuit, the first output end of the push-pull dual-path output circuit is coupled with the first output end of the driving signal output circuit, and the second output end of the push-pull dual-path output circuit is coupled with the second output end of the driving signal output circuit.
In one embodiment, the high resistance control circuit further comprises a second transistor and a number of third transistors, wherein: the first end of the first transistor is coupled to the ground, the second end of the first transistor is coupled to the first end of the second transistor, the second end of the second transistor is coupled to the input power supply and the first ends of the third transistors, the control end of the second transistor is coupled to the control ends of the third transistors, the first ends of the third transistors are coupled to the second input end of the driving signal output circuit, and the second ends of the third transistors are coupled to the output ends of the high-resistance control circuit in a one-to-one correspondence manner.
According to another aspect of the present invention, there is provided a high-resistance circuit for controlling a driving output circuit of an electronic device, comprising: the comparison circuit is provided with a first input end, a second input end and an output end, wherein the first input end of the comparison circuit is coupled with a reference signal, and the second input end of the comparison circuit is coupled with a sawtooth wave signal; the high-resistance control circuit is coupled with the driving stage output circuit and is provided with a first input end, a second input end and a plurality of output ends, the first input end of the high-resistance control circuit is coupled with the output end of the comparison circuit, the second input end of the high-resistance control circuit is coupled with the power supply signal, and the plurality of output ends of the high-resistance control circuit are used for selectively controlling the driving output circuit.
In one embodiment, the high-resistance control circuit comprises a first transistor, wherein a control end of the first transistor is coupled to an output end of the comparison circuit, and a plurality of output ends of the high-resistance control circuit are used for selectively disconnecting the driving output circuit from the power supply signal according to the state of the driving output circuit.
According to still another aspect of the present invention, there is provided an electronic device driving method including: generating a square wave signal; generating a high-resistance signal according to the square wave signal or an intermediate signal for generating the square wave signal; the coupling relation between the electronic device driving output circuit and the input power supply is controlled through the high-resistance signal; and converting the square wave signal into an output signal by the driving output circuit to drive the electronic device, and enabling the output signal of the driving output circuit to intermittently perform a resonance state based on the control of the high-resistance signal.
In one embodiment, the electronic device comprises a piezoelectric buzzer and the output signal comprises a first output signal and a second output signal that are complementary in logical relationship.
In one embodiment, generating the square wave signal includes: generating a sawtooth signal, and converting the sawtooth signal into a square wave signal.
In one embodiment, generating the high resistance signal includes: the sawtooth signal is compared with a reference signal for generating a high resistance signal.
In one embodiment, controlling the coupling relationship between the electronic device drive output circuit and the input power supply by the high resistance signal further comprises: the high-resistance signal is used for controlling the turn-off or turn-on of a transistor, and controlling the coupling or disconnection between the driving output circuit and the input power supply according to the turn-off or turn-on of the transistor.
The driving circuit of the electronic device and the high-resistance circuit thereof realize the driving of the electronic device, particularly the piezoelectric buzzer, improve the sounding loudness of the buzzer, improve the power efficiency, have higher reliability and realize the miniaturization of the system.
Drawings
FIG. 1 is a schematic diagram of a buzzer driving system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a driving circuit according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a circuit waveform according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a driving signal output circuit according to an embodiment of the invention;
fig. 5 is a schematic diagram of an electronic device driving method according to an embodiment of the invention.
The same reference numbers in different drawings identify the same or similar elements or components.
Detailed Description
For a further understanding of the present invention, preferred embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are merely intended to illustrate further features and advantages of the invention, and are not limiting of the claims of the invention.
The description of this section is intended to be illustrative of only a few exemplary embodiments and the invention is not to be limited in scope by the description of the embodiments. It is also within the scope of the description and claims of the invention to interchange some of the technical features of the embodiments with other technical features of the same or similar prior art.
"coupled" in the specification includes both direct and indirect connections, such as through an electrically conductive medium, such as a conductor, which may contain parasitic inductance or capacitance. Connection through other active or passive devices, such as through switches, follower circuits, etc., may also be included on the basis of achieving the same or similar functional objectives.
Fig. 1 is a schematic diagram of an electronic device driving system according to an embodiment of the invention. The electronic device driving system includes a driving circuit and an electronic device 15. Preferably, the electronic device 15 comprises a piezoelectric buzzer 15. The driving circuit comprises a power supply circuit 11, a crystal oscillator signal generating circuit 12, a high-resistance signal generating circuit 13 and a driving signal output circuit 14.
The input terminal of the power circuit 11 is coupled to the input power Vcc, and the output terminal of the power circuit 11 provides a voltage source. The power supply circuit 11 is used to convert the input voltage Vcc into a stable and stable voltage source for providing a suitable power supply for the crystal oscillator signal generation circuit 12.
The crystal oscillator signal generating circuit 12 is used for generating a pulse signal SQ and providing a signal basis for the driving circuit to periodically convert the voltage applied to the two ends of the buzzer. The crystal oscillator signal generating circuit 12 has an input terminal and an output terminal, wherein the input terminal of the crystal oscillator signal generating circuit 12 is coupled to the output terminal of the power circuit 11. The output end of the crystal oscillator signal generating circuit 11 provides a square wave signal SQ. In the illustrated embodiment, the crystal oscillator signal generating circuit may further have a second output terminal for providing a signal, such as a sawtooth signal, to the high-impedance signal generating circuit 13. In further embodiments, the signal provided to the high resistance signal generating circuit may be directly a square wave signal SQ.
The driving signal output circuit 14 is used for amplifying the power of the square wave signal SQ, thereby driving the buzzer 15. The drive signal output circuit 14 has a first input terminal, a second input terminal, a third input terminal, and an output terminal. Specifically, the output terminals of the driving signal output circuit 14 may include a first output terminal coupled to a first terminal of the electronic device 15 and a second output terminal coupled to a second terminal of the electronic device 15. The first input end of the driving signal output circuit 14 is coupled to the output end of the crystal oscillator signal generating circuit 12 for receiving the square wave signal SQ, the second input end of the driving signal output circuit 14 is coupled to the input power Vcc, and the third input end of the driving signal output circuit is coupled to the output end of the high-resistance signal generating circuit 13. The output of the drive signal output circuit 14 is coupled to the electronics 15 for driving the electronics 15. Specifically, the first output terminal OUT1 thereof is used for coupling to the first terminal of the electronic device 15, and the second output terminal OUT2 of the driving signal output circuit 14 is used for coupling to the second terminal of the electronic device 15. The driving signal output circuit 14 applies alternating voltages to the piezoelectric buzzer 15 so that the buzzer 15 provides a continuous sound.
The high-resistance signal generating circuit 13 has an input terminal and an output terminal, wherein the input terminal of the high-resistance signal generating circuit 13 is coupled to the crystal oscillator signal generating circuit 12, and the output terminal of the high-resistance signal generating circuit 13 is coupled to the third input terminal of the driving signal output circuit 14 for providing the high-resistance signal CR, and the high-resistance signal CR controls the output signals OUT1 and OUT2 of the output terminal of the driving signal output circuit 14 to intermittently resonate. In one embodiment, the high resistance signal CR controls the output signals OUT1 and OUT2 of the output terminal of the driving signal output circuit 14 to resonate for at least one period of time in each period. In the illustrated embodiment, the high-resistance signal generating circuit 13 further has a second input terminal for coupling to an output terminal of the power circuit 11 for providing power to the high-resistance signal generating circuit 13. However, in other embodiments, the high-resistance signal generating circuit may be coupled to other voltage input sources.
In a preferred embodiment, the electronic device is a piezoelectric buzzer. However, in other embodiments, the electronic device may be other types of devices, preferably other types of capacitive sound emitting devices.
In a preferred embodiment, the drive signal output circuit 14 comprises a push-pull two-way output circuit.
Fig. 2 is a schematic diagram of a driving circuit according to an embodiment of the invention. The driving circuit includes a power supply circuit 21, a crystal oscillator signal generating circuit 22, a high-resistance signal generating circuit 23, and a driving signal output circuit 24. The power supply circuit 21 includes a transistor, a current source, and a diode. The control terminal of the transistor is coupled to a current source, the first terminal is coupled to the input power Vcc, and the second terminal provides a voltage source to the crystal oscillator signal generating circuit 22 and the high-resistance signal generating circuit 23. In other embodiments, the power supply circuit 21 may comprise other types of structures, including bandgap voltage sources, and the like.
The crystal oscillator signal generating circuit 22 includes a sawtooth wave signal generating circuit and a waveform converting circuit. Wherein the input end of the sawtooth wave signal generating circuit is coupled with the output end of the power circuit 21, and the output end of the sawtooth wave signal generating circuit provides a sawtooth wave signal. In one embodiment, as shown in fig. 2, the sawtooth signal generating circuit includes a current source, a first capacitor C1, a comparator IC1, a voltage dividing circuit, and a feedback diode. When the first capacitor C1 is charged, the voltage of the first input end of the comparator increases, and when the voltage of the first input end rises to the threshold voltage provided by the voltage dividing circuit, the comparator reverses after delaying for a certain time, and begins to discharge the first capacitor C1, and the voltage of the first input end of the comparator decreases. When the voltage drops to the threshold voltage, the voltage is inverted again after a delay period has elapsed, thereby generating a sawtooth wave signal. The waveform conversion circuit has a first input end, a second input end and an output end, wherein the first input end of the waveform conversion circuit is coupled to the output end of the power circuit 21, the second input end of the waveform conversion circuit is coupled to the output end of the sawtooth wave signal generating circuit, namely the output end of the comparator IC1, and the output end of the waveform conversion circuit provides the square wave signal SQ. In one embodiment, as shown in fig. 2, the waveform conversion circuit includes a voltage division circuit and a comparator IC2 for converting the sawtooth wave signal output from the sawtooth wave signal generation circuit into a square wave signal. Of course, in other embodiments, the crystal oscillator signal generating circuit may use other square wave signal generating circuits or other types of pulse signal generating circuits.
The high-resistance signal generating circuit 23 is coupled to the crystal oscillator signal generating circuit 22, and is configured to generate the high-resistance signal CR for controlling the driving output circuit by receiving an intermediate signal, such as a sawtooth signal, of the crystal oscillator signal generating circuit 22. The high-resistance signal generating circuit 23 has a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the high-resistance signal generating circuit 23 is coupled to the second output terminal of the crystal oscillator signal generating circuit 22 for receiving the sawtooth wave signal. A second input terminal of the high-resistance signal generating circuit 23 is coupled to an output terminal of the power circuit for receiving a voltage source. The output terminal of the high-resistance signal generating circuit 23 is used for providing the high-resistance signal CR. In another embodiment, the high-resistance signal generation circuit 23 generates the high-resistance signal CR by receiving a square wave at the output of the crystal oscillator signal generation circuit 22. An output terminal of the high-resistance signal generating circuit 23 is coupled to a third input terminal of the driving signal output circuit for providing a high-resistance signal CR, which controls the output signals OUT1 and OUT2 of the output terminal of the driving signal output circuit 24 to resonate during at least one time period in each cycle.
In one embodiment, as shown, an input of the high-resistance signal generating circuit 23 is coupled to an output of the sawtooth signal generating circuit (i.e., an output of the comparator IC1 shown) for receiving the sawtooth signal. The high-resistance signal generating circuit 23 includes a comparing circuit IC3 and a reference signal generating circuit composed of voltage dividing resistors, and the comparing circuit IC3 compares a reference signal received at the inverting terminal (-) with a sawtooth wave signal received at the non-inverting terminal (+) of the input terminal of the high-resistance signal generating circuit 23 for generating the high-resistance signal CR. In the illustrated embodiment, the high resistance signal is a square wave signal.
The driving signal output circuit 24 has a first input terminal receiving the square wave signal SQ, a second input terminal receiving the input power Vcc, a third input terminal receiving the high resistance signal CR, and two output terminals OUT1 and OUT2. The drive signal output circuit 24 includes a high-resistance control circuit and a push-pull two-way output circuit 242. The high resistance control circuit is illustrated by a NOT gate and a transistor Q1. When the high-resistance signal CR is at a high level, the transistor Q1 is turned off, and the push-pull two-way output circuit 242 is controlled by the square wave signal SQ. When the high resistance signal CR is at a low level, the transistor Q1 is turned on, and the transistor Q1 controls the push-pull two-way output circuit 242 to be disconnected from the input power Vcc, and controls the voltage applied across the buzzer to be in a resonance state.
Fig. 3 is a schematic circuit waveform diagram according to an embodiment of the invention. In the figure, the square wave signal SQ output by the crystal oscillator signal generating circuit, the high-resistance signal CR output by the high-resistance signal generating circuit, the first output signal OUT1 output by the first output end of the driving signal output circuit, and the second output signal OUT2 output by the second output end of the driving signal output circuit are sequentially shown. The high-resistance signal CR is also a square wave signal, the rising edge of the signal CR is delayed by a certain time from the rising edge of the square wave signal SQ, and the falling edge of the signal CR is simultaneously or slightly advanced with the falling edge of the square wave signal SQ, so that in the first state of the square wave signal SQ at the first level (high level), part of the square wave signal SQ coincides with the active state (high level) of the high-resistance signal CR, i.e. both the square wave signal SQ and the high-resistance signal CR are at the high level in the corresponding time; another part of the high level of the square wave signal SQ coincides with the inactive state (low level) of the high resistance signal CR. In the first state of the signal SQ, wherein the drive signal output circuit is turned off when the high resistance signal CR is in an active state (high level). When the driving signal output circuit is turned off, the input power supply is disconnected from the output end of the driving signal output circuit, and the voltage applied to the two ends of the piezoelectric buzzer is in a high-resistance state and is subjected to resonance. The resonance will greatly increase the loudness of the buzzer, while increasing the power efficiency.
Fig. 4 is a schematic circuit diagram of a driving signal output circuit according to an embodiment of the invention. The drive signal output circuit includes a high-resistance control circuit 441 and a push-pull two-way output circuit 442. The high-resistance control circuit 441 is configured to receive the high-resistance signal CR and control the push-pull dual-output circuit 442 to be disconnected from the input power source in a stepwise manner. The high-resistance control circuit 441 has a first input terminal, a second input terminal, and a plurality of output terminals, wherein the first input terminal of the high-resistance control circuit 441 is coupled to the output terminal of the high-resistance signal generating circuit for receiving the high-resistance signal CR, the high-resistance control circuit includes a first transistor Q1, the control terminal of the first transistor Q1 is coupled to the output terminal of the high-resistance signal generating circuit, and the second input terminal of the high-resistance control circuit 441 is coupled to the second input terminal of the driving signal output circuit for receiving the power voltage Vcc. The outputs of the high-resistance control circuit 441 are provided by the emitters of transistors Q3, Q4, and Q5. In some embodiments, the outputs of the high-resistance control circuit 441 are not limited to the 3 shown, and may be more than 3.
The push-pull dual-path output circuit 442 has a first input end, a second input end, a plurality of third input ends, a first output end and a second output end, wherein the first input end of the push-pull dual-path output circuit 442 is coupled to the first input end of the driving signal output circuit for receiving the square wave signal SQ provided by the output end of the crystal oscillator signal generating circuit, the second input end of the push-pull dual-path output circuit is coupled to the second input end of the driving signal output circuit for receiving the power voltage Vcc, and the plurality of third input ends of the push-pull dual-path output circuit 442 are coupled to the plurality of output ends of the high-resistance control circuit 441. The first output terminal OUT1 of the push-pull dual output circuit 442 is coupled to the first output terminal of the driving signal output circuit for providing the first driving signal OUT1, and the second output terminal OUT2 of the push-pull dual output circuit is coupled to the second output terminal of the driving signal output circuit for providing the second driving signal. The first driving signal OUT1 and the second driving signal OUT2 are loaded at two ends of the buzzer and used for driving the buzzer to sound. When the high-resistance signal CR is in an inactive state, the transistor Q1 is turned off, the transistors Q3-Q5 are turned on, and the push-pull dual-path output circuit 442 outputs the complementary first driving signal OUT1 and the second driving signal OUT2 with alternating logic states under the driving of the square wave signal SQ. When the high-resistance signal CR is in an active state, the transistor Q1 is turned on, the control terminal of the transistor Q2 is in a high-level state, the transistors Q3 to Q5 are turned off, the third input terminals of the push-pull two-way output circuit 442 are disconnected from the power supply voltage Vcc, and the output terminal signals OUT1 and OUT2 enter a high-resistance suspension state, so that the voltage applied to the two ends of the buzzer enters a resonance state, thereby improving the loudness of the buzzer.
In the illustrated embodiment, the high resistance control circuit 441 includes a first transistor Q1, a second transistor Q2, and a number of third transistors Q3-Q5. The first end (emitter) of the first transistor Q1 is coupled to the ground, the second end (collector) of the first transistor Q1 is coupled to the first end (collector) of the second transistor Q2, the second end (emitter) of the second transistor Q2 is coupled to the input voltage Vcc and the first ends (emitters) of the third transistors Q3-Q5, the control end of the second transistor Q2 is coupled to the control ends of the third transistors Q3-Q5, and the second ends (collectors) of the third transistors Q3-Q5 are coupled to the output ends of the high-resistance control circuit 441 and the third input ends of the push-pull two-way output circuit 442 in a one-to-one correspondence. The driving output signals OUT1 and OUT2 are thus intermittently controlled to resonate by controlling the state of the high-resistance signal CR, thereby increasing the loudness at which the buzzer sounds.
In one embodiment, the high-resistance signal generating circuit (e.g., circuit 13 of fig. 1) and the high-resistance control circuit (e.g., circuit 441 of fig. 4) are collectively referred to as a high-resistance circuit for controlling the output signal of the drive output circuit of the electronic device to intermittently resonate.
In one embodiment, the high resistance circuit includes a comparison circuit and a high resistance control circuit. The comparison circuit refers to the comparator IC3 in fig. 2, which has a first input, a second input and an output, wherein the first input of the comparison circuit IC3 is coupled to a reference signal, which may be provided by a resistive voltage divider. A second input terminal of the comparison circuit IC3 is coupled to the sawtooth signal. In the embodiment shown in fig. 2, the sawtooth signal is an intermediate signal generated by a sawtooth signal generating circuit in the crystal oscillator signal generating circuit. The comparison circuit compares the sawtooth wave signal with a reference signal and outputs a high-resistance signal. By adjusting the reference signal in the high-resistance signal generating circuit and the reference signal input by the waveform converting circuit in the crystal oscillator signal generating circuit in fig. 2, the rising edge of the high-resistance signal CR may be delayed for a certain time with respect to the rising edge of the square wave signal SQ, so that the output signal OUT1 is in a high-resistance state to resonate after being converted from a low level to a high level for a certain time.
The high-resistance control circuit referring to the circuit 441 of fig. 4, the high-resistance control circuit 441 is coupled to the driving output circuit 442, the high-resistance control circuit 441 has a first input terminal, a second input terminal and a plurality of output terminals, the first input terminal of the high-resistance control circuit 441 is coupled to the output terminal of the comparing circuit for receiving the high-resistance signal CR, the high-resistance control circuit 441 includes a first transistor Q1, the control terminal of the first transistor Q1 is coupled to the output terminal of the comparing circuit, the second input terminal of the high-resistance control circuit 442 is coupled to the power signal Vcc, and the plurality of output terminals (collector sides of Q3-Q5) of the high-resistance control circuit 441 are used for selectively controlling the driving output circuit 442. In one embodiment, the drive output circuit 442 includes a push-pull two-way output circuit. In one embodiment, the output terminals of the high-resistance control circuit 441 are used to selectively disconnect the output of the driving output circuit 442 from the power signal Vcc according to the state of the driving output circuit of the electronic device, i.e. the state of the square wave signal, for example, when the square wave signal SQ is changed from low level to high level for a certain period of time, the high-resistance signal CR is changed from low level to high level, so that the output terminals of the high-resistance control circuit 441 control the output signal of the driving output circuit 442 to enter the resonance state.
Fig. 5 illustrates an electronic device driving method according to an embodiment of the present invention. The method comprises the following steps: in a first step 501, a square wave signal is generated; in a second step 502, a high-resistance signal is generated according to the square wave signal or an intermediate signal for generating the square wave signal; in a third step 503, the coupling relationship between the electronic device driving output circuit and the input power source is controlled by the high-resistance signal; and in a fourth step 504, converting the square wave signal into an output signal by the driving output circuit to drive the electronic device, and intermittently causing the output signal of the driving output circuit to be in a resonant state based on the control of the high-resistance signal. The steps in the method do not represent a temporal order, but merely a logical order.
In one embodiment, the electronic device comprises a piezoelectric buzzer and the output signal comprises a first output signal and a second output signal that are complementary in logical relationship.
In one embodiment, a method of generating a square wave signal includes generating a sawtooth signal and converting the sawtooth signal to a square wave signal. Wherein the high-impedance signal is generated by comparing the sawtooth signal with a reference signal.
In one embodiment, the controlling the coupling relationship between the electronic device driving output circuit and the input power supply by the high-resistance signal further includes controlling the turning-off or turning-on of a transistor by the high-resistance signal, and controlling the coupling or turning-off between the driving output circuit and the input power supply according to the turning-off or turning-on of the transistor.
By the aid of the embodiment, a stable and reliable driving power supply can be provided, so that the buzzer can sound stably and loudly, and high power supply efficiency is achieved.
The circuits and units of the above embodiments are further coupled to a power ground, but for convenience and simplicity of description, inputs corresponding to the connection to the power ground are not shown in the description of the above circuits.
The above description of the embodiments is only for aiding in the understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (9)
1. An electronic device driving circuit comprising:
the power supply circuit is provided with an input end and an output end, wherein the input end of the power supply circuit is coupled with an input power supply;
the crystal oscillator signal generation circuit is provided with an input end and an output end, wherein the input end of the crystal oscillator signal generation circuit is coupled with the output end of the power supply circuit, and the output end of the crystal oscillator signal generation circuit is used for providing square wave signals;
the driving signal output circuit is provided with a first input end, a second input end, a third input end and an output end, wherein the first input end of the driving signal output circuit is coupled with the output end of the crystal oscillator signal generating circuit, the second input end of the driving signal output circuit is used for being coupled with an input power supply, and the output end of the driving signal output circuit is used for being coupled with an electronic device; and
the high-resistance signal generating circuit is provided with an input end and an output end, wherein the input end of the high-resistance signal generating circuit is coupled with the crystal oscillator signal generating circuit, the output end of the high-resistance signal generating circuit is coupled with the third input end of the driving signal output circuit for providing a high-resistance signal, and the high-resistance signal controls the output signal of the output end of the driving signal output circuit to intermittently resonate;
the drive signal output circuit includes:
the push-pull double-path output circuit is provided with a first input end, a second input end, a plurality of third input ends, a first output end and a second output end, wherein the first input end of the push-pull double-path output circuit is coupled with the first input end of the driving signal output circuit, the second input end of the push-pull double-path output circuit is coupled with the second input end of the driving signal output circuit, the plurality of third input ends of the push-pull double-path output circuit are coupled with the plurality of output ends of the high-resistance control circuit, the first output end of the push-pull double-path output circuit is coupled with the first output end of the driving signal output circuit, and the second output end of the push-pull double-path output circuit is coupled with the second output end of the driving signal output circuit;
the high-resistance control circuit is provided with a first input end, a second input end and a plurality of output ends, wherein the first input end of the high-resistance control circuit is coupled with the output end of the high-resistance signal generating circuit, the second input end of the high-resistance control circuit is coupled with the second input end of the driving signal output circuit, the high-resistance control circuit comprises a first transistor, and the control end of the first transistor is coupled with the output end of the high-resistance signal generating circuit.
2. The drive circuit of claim 1, wherein the electronic device is a piezoelectric buzzer.
3. The drive circuit of claim 1, wherein the crystal oscillator signal generation circuit comprises:
the sawtooth wave signal generating circuit is provided with an input end and an output end, wherein the input end of the sawtooth wave signal generating circuit is coupled with the output end of the power supply circuit, and the output end of the sawtooth wave signal generating circuit provides a sawtooth wave signal; and
the waveform conversion circuit is provided with a first input end, a second input end and an output end, wherein the first input end of the waveform conversion circuit is coupled with the output end of the power circuit, the second input end of the waveform conversion circuit is coupled with the output end of the sawtooth wave signal generating circuit, and the output end of the waveform conversion circuit provides square wave signals.
4. A driving circuit according to claim 3, wherein an input of the high-impedance signal generating circuit is coupled to an output of the sawtooth signal generating circuit for receiving the sawtooth signal.
5. The driving circuit as claimed in claim 1, wherein the high-resistance signal generating circuit comprises a comparing circuit for comparing the reference signal with a signal at an input of the high-resistance signal generating circuit for generating the high-resistance signal.
6. The drive circuit of claim 1, wherein in the first state at the first level, a portion of the square wave signal coincides with an active state of the high resistance signal and another portion coincides with an inactive state of the high resistance signal, wherein the active state of the high resistance signal is used to turn off the drive signal output circuit.
7. The drive circuit of claim 1, wherein the high resistance control circuit further comprises a second transistor and a number of third transistors, wherein: the first end of the first transistor is coupled to the ground, the second end of the first transistor is coupled to the first end of the second transistor, the second end of the second transistor is coupled to the input power supply and the first ends of the third transistors, the control end of the second transistor is coupled to the control ends of the third transistors, the first ends of the third transistors are coupled to the second input end of the driving signal output circuit, and the second ends of the third transistors are coupled to the output ends of the high-resistance control circuit in a one-to-one correspondence manner.
8. The drive circuit according to claim 1, wherein the high-resistance signal generating circuit and the high-resistance control circuit are collectively referred to as a high-resistance circuit, the high-resistance circuit comprising:
the comparison circuit is provided with a first input end, a second input end and an output end, wherein the first input end of the comparison circuit is coupled with a reference signal, and the second input end of the comparison circuit is coupled with a sawtooth wave signal; and
the high-resistance control circuit is coupled with the output circuit of the driving stage and is provided with a first input end, a second input end and a plurality of output ends, the first input end of the high-resistance control circuit is coupled with the output end of the comparison circuit, the second input end of the high-resistance control circuit is coupled with a power supply signal, and the plurality of output ends of the high-resistance control circuit are used for selectively controlling the driving output circuit.
9. A driving method for the electronic device driving circuit according to any one of claims 1 to 8, comprising:
generating a square wave signal;
generating a high-resistance signal according to the square wave signal or an intermediate signal for generating the square wave signal;
the coupling relation between the electronic device driving output circuit and the input power supply is controlled through the high-resistance signal; and
the square wave signal is converted into an output signal by the driving output circuit to drive the electronic device, and the output signal of the driving output circuit is made to intermittently resonate based on the control of the high-resistance signal.
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| CN201810603267.8A CN108417193B (en) | 2018-06-12 | 2018-06-12 | Electronic device driving circuit, high-resistance circuit thereof and driving method |
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| CN201810603267.8A CN108417193B (en) | 2018-06-12 | 2018-06-12 | Electronic device driving circuit, high-resistance circuit thereof and driving method |
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