CN209045158U - The polyphonic ring tone drive integrated circult of built-in dcdc converter - Google Patents
The polyphonic ring tone drive integrated circult of built-in dcdc converter Download PDFInfo
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- CN209045158U CN209045158U CN201821719766.5U CN201821719766U CN209045158U CN 209045158 U CN209045158 U CN 209045158U CN 201821719766 U CN201821719766 U CN 201821719766U CN 209045158 U CN209045158 U CN 209045158U
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Abstract
The utility model provides a kind of polyphonic ring tone drive integrated circult of built-in dcdc converter, comprising: buzzer drive circuit and voltage regulator circuit, buzzer drive circuit and voltage regulator circuit are integrated in a chip；The first control terminal and the second control terminal of buzzer drive circuit are for being connected to control circuit, for the power end of buzzer drive circuit for being connected to buzzer driving power, the first output end and second output terminal of buzzer drive circuit are respectively connected to buzzer both ends；Voltage regulator circuit includes: switch module, input detection module, output detection module and control module, chip be provided with the end VCCA for access to regulated power supply.The polyphonic ring tone drive integrated circult of built-in dcdc converter solves the problems, such as that 78L05 generates heat serious in the prior art, while solving the problems, such as that the occupancy volume of not integrated voltage regulator circuit and buzzer drive circuit is larger.
Description
Technical field
The utility model relates to chord driving circuits, and in particular to a kind of polyphonic ring tone driving of built-in dcdc converter is integrated
Circuit.
Background technique
Industrial Frequency Transformer is widely used in electric heater, gas heater, washing machine and electric fan on market today to add
The mode of 78L05 is converted to 5V direct current output to entire by 78L05 as power panel (as shown in Figure 1), by 8V to 30V power supply
Control circuit power supply.Control circuit in household electrical appliances usually has following several components: regulated power supply, microcontroller (MCU), relay
Device, buzzer, LED light and associated driver circuitry.The main function of buzzer is the working condition for prompting whole system, or
Prompt tone when as user's operation.Such as prompt tone when powering on, piping when system operation irregularity.Fig. 1 is existing
The use example of small household appliances, regulated power supply therein use three terminal regulator 78L05, and buzzer in order to obtain imitate by better sounding
Fruit and user audio different when can be by control panel selection different function, use polyphonic ring tone peripheral circuit.This side
The shortcomings that case, has:
1, using 78L05 as source of stable pressure, power supply conversion efficiency is low；
2,78L05 fever is serious, need to additionally increase cooling fin；
3, it as unacceptable degree is seriously arrived in the increase 78L05 fever of output power, has been unable to meet high-power defeated
Demand out；
4, polyphonic ring tone circuit is constructed using discrete device, integrated level is low, processing is complicated and at high cost.
Utility model content
The utility model will provide a kind of polyphonic ring tone drive integrated circult of built-in dcdc converter, solve in the prior art
78L05 generates heat serious problem, while the occupancy volume for solving not integrated voltage regulator circuit and buzzer drive circuit is biggish
Problem.
To achieve the above object, the utility model uses the following technical solution:
A kind of polyphonic ring tone drive integrated circult of built-in dcdc converter, comprising: buzzer drive circuit and pressure stabilizing electricity
Road, buzzer drive circuit and voltage regulator circuit are integrated in a chip；
The first control terminal and the second control terminal of buzzer drive circuit are for being connected to control circuit, buzzer driving electricity
The power end on road is for being connected to buzzer driving power, the first output end and the second output terminal difference of buzzer drive circuit
It is connected to buzzer both ends；
Voltage regulator circuit includes: switch module, input detection module, output detection module and control module, chip setting
Have the end VCCA for access to regulated power supply, input detection module and be used to detect for detecting the end VCC voltage, output detection module
The output voltage of switch module output end, the output end and output detection module output end for inputting detection module are respectively connected to control
The first input end of molding block and the second input terminal are less than or equal to first threshold and if only if the end VCCA voltage and switch module are defeated
The output voltage of outlet is less than or equal to control module control switch module when second threshold and is closed, and control module output end is connected to
The control terminal of switch module, the power input of switch module is for being connected to the end VCCA.
Compared with the prior art, the utility model has the following beneficial effects:
It is avoided by the way that voltage regulator circuit is arranged using 78L05, good heat dissipation effect, and the energy when the end VCCA input voltage is excessive
The output of electric current, the voltage regulator circuit of protection are enough automatically cut off, the load for also protecting voltage regulator circuit to power was extended using the longevity
Life；By integrating the major part of voltage regulator circuit and buzzer drive circuit, reduces occupancy volume, facilitate
It uses.
The further advantage, target and feature of the utility model will be partially reflected by the following instructions, and part will also pass through
Research and practice to the utility model and be understood by the person skilled in the art.
Detailed description of the invention
Fig. 1 is the circuit arrangement map in chip；
Fig. 2 is the connection schematic diagram of chip when using.
Appended drawing reference: the first power tube NPN1, the second power tube NPN2, first resistor R1, the first inductance L1, the second inductance
L2, first capacitor C1, the second capacitor C2, sustained diode 1, timing capacitor C4, second resistance R2,3rd resistor R3, the 4th electricity
Hinder R4, third capacitor C3, the 5th resistance R5.
Specific embodiment
In order to make technological means of the utility model, creation characteristic, reach purpose and effect is more clear and is easy to
Understand, the utility model be further elaborated with reference to the accompanying drawings and detailed description:
As shown in Figure 1 and Figure 2, the utility model proposes a kind of polyphonic ring tones of built-in dcdc converter to drive integrated electricity
Road, comprising: buzzer drive circuit and voltage regulator circuit, buzzer drive circuit and voltage regulator circuit are integrated in a chip
In；
The first control terminal and the second control terminal of buzzer drive circuit are for being connected to control circuit, buzzer driving electricity
The power end on road is for being connected to buzzer driving power, the first output end and the second output terminal difference of buzzer drive circuit
It is connected to buzzer both ends；
Voltage regulator circuit includes: switch module, input detection module, output detection module and control module, chip setting
Have the end VCCA for access to regulated power supply, input detection module and be used to detect for detecting the end VCC voltage, output detection module
The output voltage of switch module output end, the output end and output detection module output end for inputting detection module are respectively connected to control
The first input end of molding block and the second input terminal are less than or equal to first threshold and if only if the end VCCA voltage and switch module are defeated
The output voltage of outlet is less than or equal to control module control switch module when second threshold and is closed, and control module output end is connected to
The control terminal of switch module, the power input of switch module is for being connected to the end VCCA.
In order to guarantee that entire chip can be realized voltage stabilizing function, chip is externally connected with the pressure stabilizing periphery being connected with voltage regulator circuit
Circuit；
Pressure stabilizing peripheral circuit includes: filter module, (sampling module provides detection base for output detection module to sampling module
Plinth), oscillator signal generation module (providing operation power supply for input detection module) and voltage reduction module (for switch module current limliting,
Avoid causing switch module to damage because too high voltages input), the end VCCA is connected to voltage reduction module input terminal, voltage reduction module output
End is used for the power input of connection switch module, the voltage of input detection module detection voltage reduction module output end；Oscillator signal
Generation module is used to provide oscillator signal for input detection module；Using module input for being connected to switch module output,
Sampling module output end is used to be connected to the input terminal of output detection module；Filter module input terminal is connected to the defeated of switch module
Outlet, filter module output end export voltage after pressure stabilizing.
Rest-set flip-flop is connected between control module and switch module.
In order to improve driving effect, switch module includes: the first power tube NPN1, the second power tube NPN2 and the first electricity
R1 is hindered, the base stage of the second power tube NPN2 is the control terminal of switch module, and the base stage of the second power tube NPN2 is connected to RS triggering
The end Q of device, the end DC of the current collection extremely chip of the second power tube NPN2, the emitter of the second power tube NPN2 connect the first power tube
The base stage of NPN1, the base stage of the first power tube NPN1 are connected to the one end first resistor R1, and the first resistor R1 other end is connected to
The emitter of one power tube NPN1, the end SC of the current collection extremely chip of the first power tube NPN1；The transmitting of first power tube NPN1
The extremely end SE of chip, the end DC and the end SC are the power input of switch module.
In order to provide structure simple control module, cost is reduced, control module includes: and door, the output end with door are
The output end of control module is respectively that control module first input end and second are defeated with the first input end of door and the second input terminal
Enter end.
In order to which design structure is simply input detection module, the operation for subsequent input detection module directly relies on the end VCCA
Input may make the operation of entire input detection module, avoid input detection module from needing other driving power, input
Detection module includes: oscillator, and the tc timing end chip of oscillator is the end TC of chip, and the end TC is for being connected to oscillator signal production
The output end of raw module, the isense current detecting end of oscillator are the end Tsense of chip, and the end Tsense is connected to decompression mould
Block output end and switch module power input junction, the concussion output end of oscillator are the output end for inputting detection module,
The concussion output end of oscillator is also connected to the end R of rest-set flip-flop.
In order to which design structure simply exports detection module, output detection module includes: comparator and reference power supply, base
Quasi- power cathode end ground connection, reference power supply positive terminal are connected to the noninverting input of comparator, and the output end of comparator is connected to
With the first input end of door, the reverse input end of comparator is used to be connected to the output end of sampling module.
For the simple filter module of design structure, filter module includes: the first inductance L1, the second inductance L2, the first electricity
Hold C1, the second capacitor C2 and sustained diode 1, first one end inductance L1 exports voltage after pressure stabilizing, the first inductance L1 other end
It is connected to second one end inductance L2, the second inductance L2 other end is connected to the end SE, and first capacitor C1 anode is connected to the first inductance
L1 is connected to the junction of the first inductance L1 and the second inductance L2, afterflow far from second one end inductance L2, the second capacitor C2 anode
Diode D1 cathode is connected to the end SE, and 1 anode of sustained diode, first capacitor C1 cathode and the second capacitor C2 cathode connect
Ground.
For the simple oscillator signal generation module of design structure, realizes and vibration can be driven using the input voltage at the end VCCA
The operation of device is swung, oscillator signal generation module includes: timing capacitor C4 and second resistance R2, the one end second resistance R2 and timing
Capacitor C4 anode is connected to the end TC, timing capacitor C4 cathode ground connection, and the second resistance R2 other end is connected to the end VCCA.
For the simple sample circuit of design structure, and guarantee that output detection is stablized, sample circuit includes: 3rd resistor R3
And the 4th resistance R4, the one end 3rd resistor R3 are the input terminal of sample circuit, the input terminal of sample circuit is connected to the first electricity
Feel the junction of L1 and the second inductance L2, the 3rd resistor R3 other end is connected to the 4th one end resistance R4, and the 4th resistance R4 is another
The junction of end ground connection, 3rd resistor R3 and the 4th resistance R4 are the output end of sample circuit.
Reduction voltage circuit includes: third capacitor C3 and the 5th resistance R5, and the 5th one end resistance R5 is the output of reduction voltage circuit
End, the 5th resistance R5 other end are connected to third capacitor C3 anode, and third capacitor C3 anode is connected to the end VCCA, third capacitor C3
Cathode ground connection.
The working principle of the present embodiment: VCC connects the feeder ear of buzzer, GND pin ground connection.B1, B2 are respectively buzzer
The first control terminal and the second control terminal of driving circuit, F1 and F2 are respectively the first output end and second of buzzer drive circuit
Output end, F1 connects buzzer anode and external timing capacitor C4C10, F2 connect buzzer negative terminal, can be according to different buzzers
With different polyphonic ring tone demands, control signal B1, B2 of suitable timing capacitor C4C10 and different frequency are selected.VCCA connects
DCDC transformer-supplied end, SC, DC and Isense pin meet VCCA by the 5th resistance R5.The external timing capacitor C4 of TC pin.
3rd resistor R3 samples output voltage with the 4th resistance R4, and sampled signal is fed back to the end COMP and is compared.When right
When the ripple of output voltage requires relatively low, the secondary filter being made of the first inductance L1, first capacitor C1 can be terminated in output,
To reduce the ripple of out-put supply.
Wherein, the working principle of voltage regulator circuit are as follows: after power supply VCCA is powered on, internal oscillator, which is started to work, generates oscillation arteries and veins
Signal is rushed, drives the first power tube NPN1 and the second power tube NPN2 to be connected when cycle of oscillation pulse is high level, electric current
The 5th resistance R5, the first power tube NPN1, the second power tube NPN2 and the second inductance L2 are flowed through from VCCA, to the second capacitor C2
It charges.When cycle of oscillation pulse is low level, the first power tube NPN1 and the second power tube NPN2 is closed, due to
It allows inductive current to be unable to transition, provides to allow inductance freewheel current by sustained diode 1 at this time.In this way by the second capacitor
The continuous charging of C2, output voltage constantly increase.3rd resistor R3, which has, samples output voltage with the 4th resistance R4, will adopt
Sample signal feeds back to the end COMP and is compared.When the end COMP voltage is higher than 1.25V, internal wiring switch-off power pipe, output electricity
Pressure drop is low, forms a negative feedback loop.Final output voltage is determined by sampling 3rd resistor R3 and the 4th resistance R4, is exported
Voltage computing formula is VOUT=(R3+R4)/R4*1.25V.
Oscillator by constant-current source (namely connection the end VCCA) to the external timing capacitor C4 on TC pin constantly
It is charged and discharged, to generate waveform.Be charged and discharged electric current be all it is constant, so frequency of oscillation be only dependent upon it is external fixed
When capacitor C4 capacity, second resistance R2 can provide compensation electric current, can play the role of reducing output ripple.It is inputted with the C of door
End is high level when oscillator externally charges, and D input terminal is high electricity when the incoming level of comparator is lower than 1.25V level
It is flat.When C and D input terminal all becomes high level, trigger is set to high level, output switching tube conducting.Conversely, working as oscillator
During electric discharge, C input terminal is low level, and trigger is reset such that output switching tube is in close state.
The test side current limit Isense is connected to the pressure drop between VCC and Isense foot on the 5th resistance R5 by detection
To complete function.When detecting ohmically voltage drop close to more than 300mV, current limit circuit is started to work.At this moment lead to
It crosses TC pin and quick charge is carried out to timing capacitor C4, to reduce the charging time and export the turn-on time of switching tube, the result is that
So that the shut-in time of output switching tube extends.
Finally, it is stated that above embodiments are merely intended for describing the technical solutions of the present application, but not for limiting the present application, although ginseng
The utility model is described in detail according to preferred embodiment, those skilled in the art should understand that, it can be to this
The technical solution of utility model is modified or replaced equivalently, without departing from the objective and model of technical solutions of the utility model
It encloses, should all cover in the scope of the claims of the utility model.
Claims (10)
1. a kind of polyphonic ring tone drive integrated circult of built-in dcdc converter characterized by comprising buzzer drive circuit with
And voltage regulator circuit, buzzer drive circuit and voltage regulator circuit are integrated in a chip；
The first control terminal and the second control terminal of buzzer drive circuit are used to be connected to control circuit, buzzer drive circuit
For being connected to buzzer driving power, the first output end and second output terminal of buzzer drive circuit are separately connected power end
To buzzer both ends；
Voltage regulator circuit includes: that switch module, input detection module, output detection module and control module, chip are provided with
The end VCCA inputs detection module and opens for detecting the end VCC voltage, output detection module for detecting for accessing to regulated power supply
The output voltage for closing module output end, the output end and output detection module output end for inputting detection module are respectively connected to control
The first input end of module and the second input terminal are less than or equal to first threshold and if only if the end VCCA voltage and switch module export
The output voltage at end is less than or equal to control module control switch module when second threshold and is closed, and control module output end is connected to out
The control terminal of module is closed, the power input of switch module is for being connected to the end VCCA.
2. the polyphonic ring tone drive integrated circult of built-in dcdc converter according to claim 1, which is characterized in that outside chip
It is connected with the pressure stabilizing peripheral circuit being connected with voltage regulator circuit；
Pressure stabilizing peripheral circuit includes: filter module, sampling module, oscillator signal generation module and voltage reduction module, and the end VCCA connects
It is connected to voltage reduction module input terminal, voltage reduction module output end is used for the power input of connection switch module, input detection module inspection
Survey the voltage of voltage reduction module output end；Oscillator signal generation module is used to provide oscillator signal for input detection module；Using mould
Block input terminal is used to be connected to the input terminal of output detection module for being connected to switch module output, sampling module output end；
Filter module input terminal is connected to the output end of switch module, and filter module output end exports voltage after pressure stabilizing.
3. the polyphonic ring tone drive integrated circult of built-in dcdc converter according to claim 2, which is characterized in that controlling
Rest-set flip-flop is connected between module and switch module.
4. the polyphonic ring tone drive integrated circult of built-in dcdc converter according to claim 3, which is characterized in that switching molding
Block includes: the first power tube, the second power tube and first resistor, and the base stage of the second power tube is the control terminal of switch module,
The base stage of second power tube is connected to the end Q of rest-set flip-flop, the end DC of the current collection of the second power tube extremely chip, the second power tube
Emitter connect the base stage of the first power tube, the base stage of the first power tube is connected to first resistor one end, the first resistor other end
It is connected to the emitter of the first power tube, the end SC of the current collection of the first power tube extremely chip；The transmitting of first power tube is extremely
The end SE of chip, the end DC and the end SC are the power input of switch module.
5. the polyphonic ring tone drive integrated circult of built-in dcdc converter according to claim 4, which is characterized in that control mould
Block includes: and door, the output end with door are the output end of control module, is respectively with the first input end of door and the second input terminal
Control module first input end and the second input terminal.
6. the polyphonic ring tone drive integrated circult of built-in dcdc converter according to claim 5, which is characterized in that input inspection
Surveying module includes: oscillator, and the tc timing end chip of oscillator is the end TC of chip, and the end TC is for being connected to oscillator signal generation
The output end of module, the isense current detecting end of oscillator are the end Tsense of chip, and the end Tsense is connected to voltage reduction module
Output end and switch module power input junction, the concussion output end of oscillator are the output end for inputting detection module.
7. the polyphonic ring tone drive integrated circult of built-in dcdc converter according to claim 6, which is characterized in that output inspection
Surveying module includes: comparator and reference power supply, and reference power supply negative pole end is grounded, and reference power supply positive terminal is connected to comparator
Noninverting input, the output end of comparator are connected to the first input end with door, and the reverse input end of comparator is for being connected to
The output end of sampling module.
8. the polyphonic ring tone drive integrated circult of built-in dcdc converter according to claim 7, which is characterized in that filtering mould
Block includes: the first inductance, the second inductance, first capacitor, the second capacitor and freewheeling diode, and first inductance one end exports pressure stabilizing
Voltage afterwards, the first inductance other end are connected to second inductance one end, and the second inductance other end is connected to the end SE, first capacitor anode
The first inductance is connected to far from second inductance one end, the second capacitance cathode is connected to the junction of the first inductance and the second inductance,
Freewheeling diode cathode is connected to the end SE, and freewheeling diode anode, first capacitor cathode and the second capacitor cathode are grounded.
9. the polyphonic ring tone drive integrated circult of built-in dcdc converter according to claim 8, which is characterized in that concussion letter
Number generation module includes: timing capacitor and second resistance, and second resistance one end and timing capacitor anode are connected to the end TC, fixed
When capacitor cathode be grounded, the second resistance other end is connected to the end VCCA.
10. the polyphonic ring tone drive integrated circult of built-in dcdc converter according to claim 9, which is characterized in that sampling
Circuit includes: 3rd resistor and the 4th resistance, and 3rd resistor one end is the input terminal of sample circuit, the input terminal of sample circuit
It is connected to the junction of the first inductance and the second inductance, the 3rd resistor other end is connected to the 4th resistance one end, and the 4th resistance is another
The junction of one end ground connection, 3rd resistor and the 4th resistance is the output end of sample circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821719766.5U CN209045158U (en) | 2018-10-23 | 2018-10-23 | The polyphonic ring tone drive integrated circult of built-in dcdc converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821719766.5U CN209045158U (en) | 2018-10-23 | 2018-10-23 | The polyphonic ring tone drive integrated circult of built-in dcdc converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209045158U true CN209045158U (en) | 2019-06-28 |
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ID=67037060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821719766.5U Active CN209045158U (en) | 2018-10-23 | 2018-10-23 | The polyphonic ring tone drive integrated circult of built-in dcdc converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209045158U (en) |
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2018
- 2018-10-23 CN CN201821719766.5U patent/CN209045158U/en active Active
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