CN205666819U - Analog to digital conversion circuit and contain analog to digital conversion circuit's LED drive power supply - Google Patents
Analog to digital conversion circuit and contain analog to digital conversion circuit's LED drive power supply Download PDFInfo
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- CN205666819U CN205666819U CN201620416551.0U CN201620416551U CN205666819U CN 205666819 U CN205666819 U CN 205666819U CN 201620416551 U CN201620416551 U CN 201620416551U CN 205666819 U CN205666819 U CN 205666819U
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Abstract
The utility model discloses an analog to digital conversion circuit and contain analog to digital conversion circuit's LED drive power supply, include: half -wave rectifier circuit, the alternating current power supply who holds the power input turns into DC power supply, filter circuit, with half -wave rectifier circuit, the filtering interference signal, tank passes through primary winding and the electromagnetic induction between the secondary and filter circuit point connection of transformer, control circuit, with the primary winding electricity of transformer is connected, and control is through LED's electric current size, tank, with the secondary of transformer electricity is connected, and the electric energy of storage provides drive power supply for LED, analog to digital conversion circuit is connected with tank, control circuit electricity respectively, the waveform generation module generates the triangular wave of corresponding frequency, signal processing module is connected with waveform generation module electricity, according to the triangular wave of waveform generation module create's corresponding frequency to and the analog voltage of input handles production data signal.
Description
Technical field
This utility model relates to power supply for electrical domain, a kind of analog to digital conversion circuit and containing analog to digital conversion circuit
LED drive power.
Background technology
It is relatively easy that digital signal changes into analogue signal, but to change into digital signal the most relative complex for analogue signal,
Being required for signal in a lot of circuit application and do electrical isolation process, the electrical isolation of digital signal is also easier to process, as long as
By photoelectric coupling it is achieved that and analogue signal cannot go isolation by optocoupler.Transformer isolation typically can be used to join
It is that analogue signal sampling receives foot according to VT end in Fig. 4, stable one pulse signal of offer of CFG port or AC signal is provided,
The impedance first/secondary by coupling changes the voltage of VT port.
But this application needs isolating transformer, in small power electric source domain, volume takies relatively big, and transformator becomes
This height, and can be had a strong impact on by isolating transformer leakage inductance during signal sampling.Also need to Master control chip and be provided that a road is steady
Fixed pulse voltage or alternating voltage, this most just greatly limit circuit range of application.Also have some more reliable analogue signals
The circuit of isolation processing, but upper figure can be complicated a lot, and cost is higher, the 0-10V signal isolation bought the most on the market
Isolation module, the dozens of yuan that price is low, high units up to a hundred, owing to price is the highest, it is impossible in small-power power apply.
Based on problem above, this practical information provides a kind of new solution.
Utility model content
The purpose of this utility model is to provide one the simplest circuit realiration analogue signal and changes into digital signal, and
Do the circuit application technology of signal isolation processing, simplify circuit structure, reduce cost, improve reliability.This practicality is new
The technical scheme that type provides is as follows:
A kind of analog to digital conversion circuit, including:
Waveform generating module, generates the triangular wave of corresponding frequencies；
Signal processing module, electrically connects with described waveform generating module, according to described waveform generating module generate corresponding
The triangular wave of frequency, and the analog voltage process generation digital signal of input.
It is further preferred that
Described waveform generating module includes the first comparator, frequency electric capacity, frequency resistance, divider resistance, the first feedback electricity
Resistance, the second feedback resistance, the first pull-up resistor；
The backward end of described first comparator respectively with one end of described frequency electric capacity, one end of described second feedback resistance
Electrical connection；
The forward end of described first comparator respectively with described frequency resistance, one end of described divider resistance, described first
One end electrical connection of feedback resistance；
The power input of described first comparator electrically connects with the other end of described first pull-up resistor；
The outfan of described first comparator respectively with the other end of described first feedback resistance, described second feedback resistance
The other end, described first pull-up resistor one end electrical connection；
The other end of described frequency electric capacity, the other end of described frequency resistance electrically connect with common port ground end jointly.
It is further preferred that
Described signal processing module includes the second comparator, the second pull-up resistor, the first current-limiting resistance, the second current limliting electricity
Resistance；
The end of oppisite phase of described second comparator electrically connects with the inverting input of described first comparator；
The forward end of described second comparator electrically connects with one end of described second current-limiting resistance；
The power input of described second comparator electrically connects with one end of described second pull-up resistor；
The outfan of described second comparator respectively with the other end of described second pull-up resistor, described first current-limiting resistance
One end electrical connection；
The other end of described first current-limiting resistance, the other end of described second current-limiting resistance jointly drive control end with LED
Electrical connection.
A kind of LED drive power containing analog to digital conversion circuit, including:
Half-wave rectifying circuit, filter circuit, transformator, control circuit, accumulator, analog to digital conversion circuit, LED；
Described half-wave rectifying circuit, is converted into DC source by the alternating current power supply of power input；
Described filter circuit, with described half-wave rectifying circuit, filtering interference signals；
Described accumulator is by the electromagnetic induction between armature winding and the secondary windings of described transformator and filtered electrical
Waypoint connects；
Described control circuit, electrically connects with the armature winding of described transformator, controls the size of current by LED；
Described accumulator, electrically connects with the secondary windings of described transformator, the electric energy of storage, provides for LED and drives electricity
Source；
Analog-digital conversion circuit as described, electrically connects with described accumulator, described control circuit respectively；
Described waveform generating module, generates the triangular wave of corresponding frequencies；
Described signal processing module, electrically connects with described waveform generating module, generates according to described waveform generating module
The triangular wave of corresponding frequencies, and the analog voltage process generation digital signal of input.
It is further preferred that
Described waveform generating module includes the first comparator, frequency electric capacity, frequency resistance, divider resistance, the first feedback electricity
Resistance, the second feedback resistance, the first pull-up resistor；
The backward end of described first comparator respectively with one end of described frequency electric capacity, one end of described second feedback resistance
Electrical connection；
The forward end of described first comparator respectively with described frequency resistance, one end of described divider resistance, described first
One end electrical connection of feedback resistance；
The power input of described first comparator electrically connects with the other end of described first pull-up resistor；
The outfan of described first comparator respectively with the other end of described first feedback resistance, described second feedback resistance
The other end, described first pull-up resistor one end electrical connection；
The other end of described frequency electric capacity, the other end of described frequency resistance electrically connect with common port ground end jointly.
It is further preferred that
Described signal processing module includes the second comparator, the second pull-up resistor, the first current-limiting resistance, the second current limliting electricity
Resistance；
The end of oppisite phase of described second comparator electrically connects with the inverting input of described first comparator；
The forward end of described second comparator electrically connects with one end of described second current-limiting resistance；
The power input of described second comparator electrically connects with one end of described second pull-up resistor；
The outfan of described second comparator respectively with the other end of described second pull-up resistor, described first current-limiting resistance
One end electrical connection；
The other end of described first current-limiting resistance, the other end of described second current-limiting resistance jointly drive control end with LED
Electrical connection.
It is further preferred that also include:
Described half-wave rectifying circuit is connected by 4 unipolar diode bridge-types and forms；
Described filter circuit is made up of an inducer and an electric capacity electrical connection；
Described accumulator is made up of two electrochemical capacitor parallel connection electrical connections；
Described control circuit is electrically connected by a control chip and MOS transistor and forms.
It is further preferred that also include:
Photoisolator, analog-digital conversion circuit as described is electrically connected with described control circuit by described photoisolator, subtracts
The electromagnetic interference of the digital signal that few analog-digital conversion circuit as described produces.
It is further preferred that also include:
Standby analog to digital conversion circuit includes waveform generating module, signal processing module；
Described waveform generating module, generates the triangular wave of corresponding frequencies；
Described signal processing module, electrically connects with described waveform generating module, generates according to described waveform generating module
The triangular wave of corresponding frequencies, and the analog voltage process generation digital signal of input；
Standby analog to digital conversion circuit, electrically connects with described control circuit, transfers analogue signal to digital signal.
The photosynthetic instrument buffer unit provided by this utility model, it is possible to bring at least one beneficial effect following:
After this utility model takes technique scheme, during input voltage linear change, the output electric current of complete machine is also
Follow smooth change, reach expected result.Comparing with traditional analog to digital conversion circuit, this circuit is simpler, circuit
Volume also reduces a lot, and wherein component used is all the product of mass on electronic market, and technical maturity, unit price is relatively
Low, module cost is greatly reduced, and test finds that the electromagnetic interference that this circuit produces is the lowest, is lost considerably less.
Accompanying drawing explanation
Below by the way of the most understandable, accompanying drawings preferred implementation, to a kind of analog to digital conversion circuit and
Above-mentioned characteristic, technical characteristic, advantage and the implementation thereof of the LED drive power containing analog to digital conversion circuit give furtherly
Bright.
Fig. 1 is the enforcement illustration of a kind of analog to digital conversion circuit of this utility model；
Fig. 2 is the enforcement illustration of a kind of LED containing analog to digital conversion circuit of this utility model；
Fig. 3 is the oscillogram that this utility model inputs that different analog voltages produces；
Fig. 4 is transformer isolation prior art comparison chart of the present utility model.
Detailed description of the invention
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, accompanying drawing will be compareed below
Detailed description of the invention of the present utility model is described.It should be evident that the accompanying drawing in describing below is only of the present utility model one
A little embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to these
Accompanying drawing obtains other accompanying drawing, and obtains other embodiment.
For making simplified form, only schematically show the part relevant to this utility model in each figure, they are also
Do not represent its practical structures as product.It addition, so that simplified form readily appreciates, have in some figure identical structure or
The parts of function, only symbolically depict one of them, or have only marked one of them.In this article, " one " no
Only represent " only this ", it is also possible to represent the situation of " more than one ".
Embodiment one:
Utility model provides a kind of analog to digital conversion circuit, with reference to shown in Fig. 1；
Need a twin voltage comparator, as LM393, LM393 provide the VCC voltage of a 12V.Can be directly from switch
The former limit of power supply or secondary are by resistive pull-downs, then pass through stabilivolt voltage stabilizing, or audion linear voltage stabilization, or from feedback
Winding draw come do constant voltage can.
The annexation of concrete circuit is shown by Fig. 1；Operation principle: R8 and R6 in circuit carries out dividing potential drop to VCC,
R8 divides the voltage taken to be input to the positive input of left side comparator, and R3 is negative feedback resistor, and R5, R9 are current-limiting resistances；Cause
Being all the colelctor electrode of transistor for the output of comparator, R4 is pull-up resistor, when internal transistor ends, this resistance carries
For high level；And during conduct internal transistors, by this level short to ground, just can just give birth to low level；Without this resistance, this
Individual comparator just cannot export high level；Being operated in unstable state state with a comparator, its output produces triangular wave.Should simultaneously
Triangular wave compares with the voltage signal of input, produces PWM ripple.The frequency of its output PWM is determined by C2 and R6, the width of PWM
Spend the analog voltage signal inputted by such as the comparator positive input on the right of Fig. 1 to determine, as shown in Figure 3.Within the specific limits
Different input voltages will produce the PWM waveform of different duty；Use above first achieves analogue signal and is converted into numeral
Signal.
Embodiment two:
This utility model additionally provides a kind of LED drive power containing analog to digital conversion circuit；With reference to shown in figure；
In the present embodiment with reference to shown in Fig. 2；Figure includes two signal processings, and this signal processing i.e. refers to first
Analog to digital conversion circuit in embodiment is with reference to shown in Fig. 1.By the left end AC port input ac voltage shown in circuit diagram 2, profit
With the half-wave bridge rectification circuit of 4 unipolar diode compositions, alternating voltage is converted into unidirectional (i.e. direction is constant) but size
Still there is the DC voltage of pulsation；By this voltage through the filter circuit being made up of inductance and capacitor, after filtering AC rectification
Alternating component, thus obtain the unidirectional current smoothed.Further across the transformator being made up of armature winding and secondary windings, secondary
The level accumulator that is attached thereto of winding terminal, its energy-storage travelling wave tube is made up of two electrochemical capacitors, for analog to digital conversion circuit and send out
Optical diode provides power supply；When analog to digital conversion circuit normally works, the digital information number (and PWM ripple) of output is passed through optocoupler
Isolator electrically connects with control chip, and control chip carries out chip internal process by the PWM of input, and output has corresponding duty
The signal of ratio, controls the turn-on and turn-off of the grid of metal-oxide-semiconductor further；The turn-on and turn-off time of the grid of metal-oxide-semiconductor is further
Control conducting and the shutoff of primary, make secondary windings produce corresponding electric energy with this, and then control by LED path electricity
The size of stream, controls the bright dark degree of LED.
The present embodiment additionally provides standby analog to digital conversion circuit, and such as the signal processing on Fig. 2 left side, this standby modulus turns
Change circuit produce digital signal without optical coupling isolator, directly electrically connect with control chip；It plays in embodiment two
Effect identical with the analog to digital conversion circuit on right side.
One LED drive power, if needing compatible 0-10V dimming function, and controls IC and samples per se with pwm signal
Port, 0-10V signal can be completed analogue signal convert from the primary offer of power supply, the signal processing module introduced by Fig. 1
Become digital signal, it is also possible to from the secondary input 0-10V signal of power supply, the most do not forget that signal, when secondary inputs, passes through
Electrical isolation, the electrical isolation of guarantee complete machine must be done by optocoupler after signal processing.
It should be noted that, above-described embodiment all can independent assortment as required.The above is only of the present utility model
Preferred implementation, it is noted that for those skilled in the art, without departing from this utility model principle
On the premise of, it is also possible to making some improvements and modifications, these improvements and modifications also should be regarded as protection domain of the present utility model.
Claims (9)
1. an analog to digital conversion circuit, it is characterised in that including:
Waveform generating module, generates the triangular wave of corresponding frequencies；
Signal processing module, electrically connects with described waveform generating module, the corresponding frequencies generated according to described waveform generating module
Triangular wave, and input analog voltage process produce digital signal.
Analog to digital conversion circuit the most according to claim 1, it is characterised in that
Described waveform generating module include the first comparator, frequency electric capacity, frequency resistance, divider resistance, the first feedback resistance,
Two feedback resistances, the first pull-up resistor；
The backward end of described first comparator one end with one end of described frequency electric capacity, described second feedback resistance respectively is electrically connected
Connect；
The forward end of described first comparator respectively with described frequency resistance, one end of described divider resistance, described first feedback
One end electrical connection of resistance；
The power input of described first comparator electrically connects with the other end of described first pull-up resistor；
The outfan of described first comparator respectively with the other end of described first feedback resistance, described second feedback resistance another
One end, one end electrical connection of described first pull-up resistor；
The other end of described frequency electric capacity, the other end of described frequency resistance electrically connect with common port ground end jointly.
Analog to digital conversion circuit the most according to claim 2, it is characterised in that
Described signal processing module includes the second comparator, the second pull-up resistor, the first current-limiting resistance, the second current-limiting resistance；
The end of oppisite phase of described second comparator electrically connects with the inverting input of described first comparator；
The forward end of described second comparator electrically connects with one end of described second current-limiting resistance；
The power input of described second comparator electrically connects with one end of described second pull-up resistor；
The outfan of described second comparator respectively with the other end of described second pull-up resistor, the one of described first current-limiting resistance
End electrical connection；
The other end of described first current-limiting resistance, the other end of described second current-limiting resistance drive control end to be electrically connected jointly with LED
Connect.
4. the LED drive power containing analog to digital conversion circuit, it is characterised in that including:
Half-wave rectifying circuit, filter circuit, transformator, control circuit, accumulator, analog to digital conversion circuit, LED；
Described half-wave rectifying circuit, is converted into DC source by the alternating current power supply of power input；
Described filter circuit, with described half-wave rectifying circuit, filtering interference signals；
Described accumulator is by the electromagnetic induction between armature winding and the secondary windings of described transformator and filtered electrical waypoint
Connect；
Described control circuit, electrically connects with the armature winding of described transformator, controls the size of current by LED；
Described accumulator, electrically connects with the secondary windings of described transformator, the electric energy of storage, provides for LED and drives power supply；
Analog-digital conversion circuit as described, electrically connects with described accumulator, described control circuit respectively；
Waveform generating module, generates the triangular wave of corresponding frequencies；
Signal processing module, electrically connects with described waveform generating module, the corresponding frequencies generated according to described waveform generating module
Triangular wave, and input analog voltage process produce digital signal.
LED drive power containing analog to digital conversion circuit the most according to claim 4, it is characterised in that
Described waveform generating module include the first comparator, frequency electric capacity, frequency resistance, divider resistance, the first feedback resistance,
Two feedback resistances, the first pull-up resistor；
The backward end of described first comparator one end with one end of described frequency electric capacity, described second feedback resistance respectively is electrically connected
Connect；
The forward end of described first comparator respectively with described frequency resistance, one end of described divider resistance, described first feedback
One end electrical connection of resistance；
The power input of described first comparator electrically connects with the other end of described first pull-up resistor；
The outfan of described first comparator respectively with the other end of described first feedback resistance, described second feedback resistance
The other end, one end electrical connection of described first pull-up resistor；
The other end of described frequency electric capacity, the other end of described frequency resistance electrically connect with common port ground end jointly.
LED drive power containing analog to digital conversion circuit the most according to claim 5, it is characterised in that
Described signal processing module includes the second comparator, the second pull-up resistor, the first current-limiting resistance, the second current-limiting resistance；
The end of oppisite phase of described second comparator electrically connects with the inverting input of described first comparator；
The forward end of described second comparator electrically connects with one end of described second current-limiting resistance；
The power input of described second comparator electrically connects with one end of described second pull-up resistor；
The outfan of described second comparator respectively with the other end of described second pull-up resistor, the one of described first current-limiting resistance
End electrical connection；
The other end of described first current-limiting resistance, the other end of described second current-limiting resistance drive control end to be electrically connected jointly with LED
Connect.
LED drive power containing analog to digital conversion circuit the most according to claim 4, it is characterised in that also include:
Described half-wave rectifying circuit is connected by 4 unipolar diode bridge-types and forms；
Described filter circuit is made up of an inducer and an electric capacity electrical connection；
Described accumulator is made up of two electrochemical capacitor parallel connection electrical connections；
Described control circuit is electrically connected by a control chip and MOS transistor and forms.
LED drive power containing analog to digital conversion circuit the most according to claim 7, it is characterised in that also include:
Photoisolator, analog-digital conversion circuit as described is electrically connected with described control circuit by described photoisolator, reduces institute
State the electromagnetic interference of the digital signal that analog to digital conversion circuit produces.
LED drive power containing analog to digital conversion circuit the most according to claim 6, it is characterised in that also include:
Standby analog to digital conversion circuit includes waveform generating module, signal processing module；
Described waveform generating module, generates the triangular wave of corresponding frequencies；
Described signal processing module, electrically connects with described waveform generating module, according to described waveform generating module generate corresponding
The triangular wave of frequency, and the analog voltage process generation digital signal of input；
Standby analog to digital conversion circuit, electrically connects with described control circuit, transfers analogue signal to digital signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620416551.0U CN205666819U (en) | 2016-05-10 | 2016-05-10 | Analog to digital conversion circuit and contain analog to digital conversion circuit's LED drive power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620416551.0U CN205666819U (en) | 2016-05-10 | 2016-05-10 | Analog to digital conversion circuit and contain analog to digital conversion circuit's LED drive power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205666819U true CN205666819U (en) | 2016-10-26 |
Family
ID=57160536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620416551.0U Active CN205666819U (en) | 2016-05-10 | 2016-05-10 | Analog to digital conversion circuit and contain analog to digital conversion circuit's LED drive power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205666819U (en) |
-
2016
- 2016-05-10 CN CN201620416551.0U patent/CN205666819U/en active Active
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| C14 | Grant of patent or utility model | ||
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Address after: Huqiu high tech Zone of Suzhou City, Jiangsu province 215151 Shen Lane Road No. 1 Patentee after: Suzhou Angrui Electronic Technology Co., Ltd Address before: Huqiu high tech Zone of Suzhou City, Jiangsu province 215151 Shen Lane Road No. 1 Patentee before: SUZHOU KOSNIC LIGHTING TECHNOLOGY Co.,Ltd. |