CN208819107U - Voltage regulator circuit, adjustable output voltage circuit and electrical equipment - Google Patents
Voltage regulator circuit, adjustable output voltage circuit and electrical equipment Download PDFInfo
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- CN208819107U CN208819107U CN201821009846.1U CN201821009846U CN208819107U CN 208819107 U CN208819107 U CN 208819107U CN 201821009846 U CN201821009846 U CN 201821009846U CN 208819107 U CN208819107 U CN 208819107U
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Abstract
The utility model relates to a kind of voltage regulator circuit, adjustable output voltage circuit and electrical equipment, voltage regulator circuit includes: first resistor and filter circuit；One end of first resistor connects the control terminal of adjustable output voltage circuit by filter circuit, and the other end connects the pressure stabilizing reference circuit of adjustable output voltage circuit by the voltage sampling circuit of adjustable output voltage circuit；Wherein, the output end that pressure stabilizing reference circuit passes through the opto-coupled feedback circuit connection adjustable output voltage circuit of adjustable output voltage circuit；Output end connects voltage sampling circuit；Filter circuit receives the external control signal of control terminal input, and voltage sampling circuit, pressure stabilizing reference circuit and opto-coupled feedback circuit adjust the voltage value of output end according to external control signal.Pass through above-mentioned voltage regulator circuit, thus it is possible to vary the external control signal of input to change the voltage of output, and can make the voltage stabilization of output.
Description
Technical field
The utility model relates to technical field of electronic equipment, adjustable defeated more particularly to a kind of voltage regulator circuit, one kind
Potential circuit and a kind of electrical equipment out.
Background technique
Constant-voltage circuit is common a kind of element circuit in Analogous Integrated Electronic Circuits, is had in most electronic product
Be widely applied.Such as the household electronic products such as refrigerator, air-conditioning, washing machine, integrated kitchen range are both provided with constant-voltage circuit, lead to
Constant-voltage circuit is crossed to export constant voltage.However, the constant voltage that different electrical equipments needs is different, in order to ensure perseverance
Fixed voltage circuit is compatible well, generallys use a kind of linear regulation output voltage circuit at present, and wherein linear regulation exports
Potential circuit includes power supply circuit and the feedback adjustment being connected between the power supply output end of power supply circuit and feedback control end electricity
Road, feedback adjustment circuit include light phase feedback unit, pressure stabilizing reference cell, voltage sampling unit, voltage-adjusting unit, input
End, output end and control terminal, by feedback regulating circuit input terminal input external control signal to voltage regulation unit and instead
Feedback adjusts the interaction of each unit in circuit, so that adjusting output end exports different constant voltages, but is input to voltage at present
Often there is ripple in adjustment unit, so as to cause the spread of voltage of feedback adjustment circuit output.
Utility model content
Based on this, it is necessary to for it is existing be input to voltage-adjusting unit and often there is ripple lead to feedback adjustment circuit
The problem of spread of voltage of output, provides a kind of voltage regulator circuit.
A kind of voltage regulator circuit, comprising: first resistor and filter circuit；
One end of the first resistor connects the control terminal of adjustable output voltage circuit, the other end by the filter circuit
The pressure stabilizing reference circuit of the adjustable output voltage circuit is connected by the voltage sampling circuit of the adjustable output voltage circuit；
Wherein, adjustable output electricity described in opto-coupled feedback circuit connection of the pressure stabilizing reference circuit by the adjustable output voltage circuit
The output end of volt circuit；The output end connects the voltage sampling circuit；
The filter circuit receives the external control signal of control terminal input, the voltage sampling circuit, described steady
Pressure reference circuit and the opto-coupled feedback circuit adjust the voltage value of the output end according to the external control signal.
Above-mentioned voltage regulator circuit, including first resistor and filter circuit, wherein one end of first resistor connects filtering
One end of circuit, the control terminal of the other end connection adjustable output voltage circuit of filter circuit, wherein control terminal is outer for exporting
Portion controls signal (usually voltage signal), and the other end of first resistor is sequentially connected the voltage sample of adjustable output voltage circuit
Circuit, pressure stabilizing reference circuit and opto-coupled feedback circuit, and one end of pressure stabilizing reference circuit is connected with one end of opto-coupled feedback circuit
The output end of adjustable output voltage circuit, filter circuit receive the external control signal inputted from control terminal, to outside control letter
It number is filtered, the external control signal after being filtered is transmitted to voltage sampling circuit, pressure stabilizing reference circuit and light
Coupling feed circuit, voltage sampling circuit, pressure stabilizing reference circuit and opto-coupled feedback circuit are mutual according to filtered external control signal
It matches, corresponding voltage is exported by output end.Pass through above-mentioned voltage regulator circuit, thus it is possible to vary the external control of input
Signal to change the voltage of output, and can make the voltage stabilization of output.In addition, it is easy to use, it is easy to operate.
In one of the embodiments, further include: first be connected between the first resistor and the filter circuit
Diode；The anode of the first diode connects the first resistor, and the cathode of the first diode connects the filtering
Circuit.
The filter circuit includes second resistance and first capacitor in one of the embodiments,；
The cathode of the first diode is grounded by the first capacitor；One end of the second resistance is connected to described
Between the cathode of first diode and the first capacitor, the other end connects the control terminal.
According to above-mentioned voltage regulator circuit, a kind of adjustable output voltage electricity is additionally provided in the utility model embodiment
Road.
A kind of adjustable output voltage circuit, comprising: opto-coupled feedback circuit, pressure stabilizing reference circuit, voltage sampling circuit, output
End, control terminal and voltage regulator circuit, wherein the voltage regulator circuit includes first resistor and filter circuit；
One end of the first resistor connects the control terminal by the filter circuit, and the other end is adopted by the voltage
One end of pressure stabilizing reference circuit described in sample circuit connection；The other end of the pressure stabilizing reference circuit connects the opto-coupled feedback circuit
Primary side output end；The primary side input terminal of the opto-coupled feedback circuit connects the output end, and secondary side output end connects power supply core
Piece；The output end connects the voltage sampling circuit；
The filter circuit receives the external control signal of control terminal input, the voltage sampling circuit, described steady
Pressure reference circuit and the opto-coupled feedback circuit adjust the voltage value of the output end according to the external control signal.
Above-mentioned adjustable output voltage circuit is due to using above-mentioned voltage regulator circuit, so, it may have voltage tune
The economize on electricity corresponding beneficial effect in road, it can by changing the external control signal of input, to change the voltage of output, and energy
Make the voltage stabilization of output.In addition, it is easy to use, it is easy to operate.
The voltage regulator circuit in one of the embodiments, further include: first diode；The first diode connects
It connects between the first resistor and the filter circuit, and the anode of the first diode connects the first resistor, bears
Pole connects the filter circuit.
The filter circuit includes second resistance and first capacitor in one of the embodiments,；
The cathode of the first diode is grounded by the first capacitor, and one end of the second resistance is connected to described
Between the cathode of first diode and the first capacitor, the other end connects the control terminal.
3rd resistor and the 4th resistance in one of the embodiments,；One end of the 3rd resistor connects the output
End, the other end pass through the 4th resistance eutral grounding；The other end of the first resistor and the pressure stabilizing reference circuit are separately connected
Between the 3rd resistor and the 4th resistance.
The pressure stabilizing reference circuit includes pressure stabilizing standard and feedback compensation circuit in one of the embodiments, described
Feedback compensation circuit is connected between the reference input and cathode of the pressure stabilizing standard；The reference of the pressure stabilizing standard is defeated
Enter end to be connected between the 3rd resistor and the 4th resistance, pole ground connection, the cathode connects the opto-coupled feedback circuit
Primary side output end.
The opto-coupled feedback circuit includes photo-coupler, the 5th resistance and the 6th resistance in one of the embodiments,；
The photo-coupler includes the optical signal converter positioned at the light emitting diode of primary side and positioned at secondary side；It is described to shine
The signal input part of diode connects the output end by the 5th resistance, and signal output end connects the pressure stabilizing standard
Cathode；6th resistance is connected between the signal input part and signal output end of the light emitting diode；
The output end of the optical signal converter is for connecting the power supply chip, the input terminal of the optical signal converter
Ground connection.
The feedback compensation circuit includes the second capacitor, third capacitor and the 7th resistance in one of the embodiments,；
One end of second capacitor connects the cathode of the pressure stabilizing standard, and the other end is connected by the 7th resistance
Between the 3rd resistor and the 4th resistance；
One end of the third capacitor connects the cathode of the pressure stabilizing standard, the other end be connected to the 3rd resistor and
Between 4th resistance.
It in one of the embodiments, further include the first inductance, one end of first inductance is connected to the output end
Between the 5th resistance, the other end of first inductance is connected between the output end and the 3rd resistor.
According to above-mentioned adjustable output voltage circuit, a kind of electrical equipment is additionally provided in the utility model embodiment.
A kind of electrical equipment, including the adjustable output voltage circuit.
Above-mentioned electrical equipment is because of the adjustable output voltage circuit described in using, in this way, the electrical equipment can basis
Actual application adjusts corresponding voltage, easy to use.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of voltage regulator circuit in one embodiment；
Fig. 2 is the structural schematic diagram of voltage regulator circuit in one embodiment；
Fig. 3 is the structural schematic diagram of adjustable output voltage circuit in one embodiment；
Fig. 4 is the structural schematic diagram of adjustable output voltage circuit in one embodiment.
Specific embodiment
The content of the utility model is described in further detail below in conjunction with preferred embodiment and attached drawing.Obviously, under
Literary described embodiment only explains the utility model, rather than the restriction to the utility model.Based on the reality in the utility model
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the range of the utility model protection.It should be noted that illustrating only for ease of description, in attached drawing and the utility model phase
The part of pass rather than full content.
For the ease of understanding the utility model, below with reference to relevant drawings to being originally described more fully.It needs
Bright, when an element is considered as " connection " another element, it can be directly to another element and therewith
It is combined as a whole, or may be simultaneously present centering elements.Term as used herein " installation ", " one end ", " other end " with
And similar statement is for illustrative purposes only.
Unless otherwise defined, all technical and scientific terms used herein and the technology people for belonging to the art
The normally understood meaning of member is identical.Term used in book described herein is intended merely to the mesh of description specific embodiment
, it is not intended that in limitation the utility model.Term " and or " used herein includes one or more relevant institute's lists
Any and all combinations of purpose.In addition, " first ", " second ", " third ", " the 4th " are intended merely to distinguish and are retouched herein
The object stated not is the restriction to object.
A kind of voltage regulator circuit, as shown in Figure 1, comprising: first resistor R1 and filter circuit 102；First resistor R1's
One end connects the control terminal C of adjustable output voltage circuit 100 by filter circuit 102, and the other end of first resistor R1 passes through can
The voltage sampling circuit 20 of output voltage circuit 100 is adjusted to connect the pressure stabilizing reference circuit 30 of the adjustable output voltage circuit 100；
Wherein, pressure stabilizing reference circuit 30 connects adjustable output voltage electricity by the opto-coupled feedback circuit 40 of adjustable output voltage circuit 100
The output end out on road；Output end out connection voltage sampling circuit 10；Filter circuit 102 receives the external control of control terminal C input
Signal processed, voltage sampling circuit 20, pressure stabilizing reference circuit 30 and opto-coupled feedback circuit 40 are adjusted according to external control signal and are exported
Hold the voltage value of out.
Specifically, adjustable output voltage circuit 100 is a kind of feedback voltage adjusting circuit, including voltage regulator circuit
It is 10 (wherein the regulation of electrical circuit circuit 100 includes first resistor R1 and filter circuit 102), control terminal C, voltage sampling circuit 20, steady
Reference circuit 30, opto-coupled feedback circuit 40 and output end out are pressed, wherein the one end control terminal C connects voltage regulator circuit, another
End usually connection single-chip microcontroller, for exporting external control signal (usually voltage signal), voltage regulator circuit 10 is to receiving
External control signal be filtered, the external control signal after filtering processing is transmitted to voltage sampling circuit 20, steady
Press reference circuit 30 and opto-coupled feedback circuit 40, voltage sampling circuit 20, pressure stabilizing reference circuit 30 and opto-coupled feedback circuit
40, according to filtered external control signal (voltage value), are adjusted the voltage value of output end, to export different range
Output voltage values.
In addition, external control signal is usually a kind of voltage signal for utilizing single-chip microcontroller directly to issue, in voltage signal often
There is ripple (i.e. clutter) to exist, i.e., external control signal may occur unstable, since the unstability of external control signal is held
Easily lead to the unstability of output end output voltage.Therefore, in the present embodiment, using the voltage for including filter circuit 102
Circuit 10 is adjusted, using the clutter of filter circuit removal external control signal, external control signal is converted into stable direct current
Voltage signal, to adjust the output voltage of output end according to steady dc voltage signal.
In addition, filter circuit 102 generallys use first-order low-pass wave circuit.First-order low-pass wave circuit can rapidly will be outer
Portion's control signal (such as pwm circuit signal etc.) is transformed into d. c. voltage signal.
Above-mentioned voltage regulator circuit, including first resistor R1 and filter circuit 102, wherein one end of first resistor R1 connects
One end of filter circuit 102 is connect, the other end of filter circuit 102 connects the control terminal C of adjustable output voltage circuit 100, wherein
For exporting external control signal (usually voltage signal), the other end of first resistor R1 is sequentially connected adjustable defeated control terminal C
The voltage sampling circuit 20 of potential circuit 100, pressure stabilizing reference circuit 30 and opto-coupled feedback circuit 40 out, and pressure stabilizing reference circuit 30
One end the output end C of adjustable output voltage circuit 100 is connected with one end of opto-coupled feedback circuit 40, filter circuit 102 receives
The external control signal inputted from control terminal, is filtered external control signal, the external control after being filtered
Signal is transmitted to voltage sampling circuit 20, pressure stabilizing reference circuit 30 and opto-coupled feedback circuit 40, voltage sampling circuit 20, pressure stabilizing base
Quasi- circuit 30 and opto-coupled feedback circuit 40 are worked in coordination according to filtered external control signal, are exported by output end corresponding
Voltage.Pass through above-mentioned voltage regulator circuit, thus it is possible to vary the external control signal of input, thus change the voltage of output, and
It can make the voltage stabilization of output.In addition, it is easy to use, it is easy to operate.
In one of the embodiments, further include: as shown in Fig. 2, being connected between first resistor R1 and filter circuit 102
First diode D1；The cathode of anode connection the first resistor R1, first diode D1 of first diode D1 connect filtered electrical
Road.
Specifically, voltage regulator circuit further includes first diode D1, and wherein first diode D1 is connected to first resistor
Between R1 and filter circuit 102, wherein the anode of first diode D1 is connect with first resistor R1, the cathode of first diode D1
It is connect with filter circuit 102.First diode D1 is mainly used for preventing from being reversely connected, that is, prevents from providing the equipment of external control signal
When (usually single-chip microcontroller) crashes or is abnormal, directly the external control signal with relatively high voltage value is adjusted by voltage
First resistor R1 in circuit is applied directly on pressure stabilizing reference circuit, to influence the accuracy of pressure stabilizing reference circuit, it is difficult to real
Existing pressure stabilizing.
In one of the embodiments, as shown in Fig. 2, filter circuit 102 includes second resistance R2 and first capacitor C1；The
The cathode of one diode D1 is grounded by first capacitor C1, one end of second resistance R2 be connected to the cathode of first diode D1 with
Between first capacitor C1, the other end of second resistance R2 connects control terminal C.
RC circuit, is also PC filter, and one of capacitor and a resistance can form simplest first-order filtering electricity
Road.In the present embodiment, the first-order filtering circuit formed using second resistance R2 and first capacitor C1, can quickly go out external control
Ripple in signal processed, so that addition is more stable in the external control signal of control terminal, to guarantee the electricity of output end output
It presses more stable.
It should be appreciated that above-mentioned filter circuit composition is not unique, those skilled in the art can select it according to its demand
His filter, such as by inductance, electric group and capacitor these three combination of devices, form different filter circuits.
According to above-mentioned voltage regulator circuit, a kind of adjustable output voltage electricity is additionally provided in the utility model embodiment
Road.
A kind of adjustable output voltage circuit, as shown in Figure 3, comprising: opto-coupled feedback circuit 40, pressure stabilizing reference circuit 30, electricity
Sample circuit 20, output end out, control terminal C and voltage regulator circuit 10 are pressed, wherein voltage regulator circuit 10 includes first resistor
R1 and filter circuit 102；One end of first resistor R1 connects control terminal C, the other end of first resistor R1 by filter circuit 102
One end of pressure stabilizing reference circuit 30 is connected by voltage sampling circuit 20, the other end of pressure stabilizing reference circuit 30 connects opto-coupled feedback
The primary side input terminal of the primary side output end of circuit 40, opto-coupled feedback circuit 40 connects output end C；The secondary side of opto-coupled feedback circuit 40
Output end is for connecting power supply chip；Output end out connection voltage sampling circuit 20；Filter circuit 20 receives control terminal C input
External control signal, voltage sampling circuit 20, pressure stabilizing reference circuit 30 and opto-coupled feedback circuit 40 are according to external control signal
Adjust the voltage value of output end out.
Adjustable output voltage circuit 100 is a kind of feedback voltage adjusting circuit, (wherein including voltage regulator circuit 10
The regulation of electrical circuit circuit 100 includes first resistor R1 and filter circuit 102), control terminal C, voltage sampling circuit 20, pressure stabilizing benchmark electricity
Road 30, opto-coupled feedback circuit 40 and output end out, wherein the one end control terminal C connects voltage regulator circuit, and the other end usually connects
Single-chip microcontroller is connect, for exporting external control signal (usually voltage signal), external control of the voltage regulator circuit 10 to receiving
Signal processed is filtered, and the external control signal after filtering processing is transmitted to voltage sampling circuit 20, pressure stabilizing benchmark electricity
Road 30 and opto-coupled feedback circuit 40, voltage sampling circuit 20, pressure stabilizing reference circuit 30 and opto-coupled feedback circuit 40 are according to filter
External control signal (voltage value) after wave, is adjusted the voltage value of output end, to export the output electricity of different range
Pressure value.
Opto-coupled feedback circuit 40, is generally used in isolated power supply, is a kind of simple, low cost isolation feedback system.Light
Coupling feed circuit is usually made of photo-coupler, and photo-coupler includes primary and secondary side, and primary side is equivalent to a light emitting diode,
The just extremely primary side input terminal of light emitting diode, cathode are primary side output end；Secondary side is equivalent to optical signal converter (usually three
Pole pipe), photoconverter also includes input terminal and output end, the input end grounding of photoconverter, output end connection power supply chip.Electricity
Source chip is usually in electronic equipment or electrical equipment to the chip of the transformation of electric energy, distribution, detection and other electric energy managements,
In the present embodiment, the secondary side output end of photo-coupler connects power supply chip, is commonly connected the COMP foot in power supply chip, COMP
Foot in the chip portion connect be an operational amplifier negative input, be using output voltage as feedback lead back voltage core
Piece plays the role of protection.
In one of the embodiments, as shown in figure 4, voltage regulator circuit 10 further include: be connected to first resistor R1 with
First diode D1 between filter circuit 102；The anode connection first resistor R1 of first diode D1, first diode D1's
Cathode connects filter circuit 102.
Voltage regulator circuit further includes first diode D1, and wherein first diode D1 is connected to first resistor R1 and filtering
Between circuit 102, wherein the anode of first diode D1 is connect with first resistor R1, the cathode and filtered electrical of first diode D1
Road 102 connects.First diode D1 is mainly used for preventing from being reversely connected, that is, prevents from providing the equipment of external control signal (usually
Single-chip microcontroller) when crashing or is abnormal, it will directly pass through in voltage regulator circuit with the external control signal of relatively high voltage value
First resistor R1 be applied directly on pressure stabilizing reference circuit, to influence the accuracy of pressure stabilizing reference circuit, it is difficult to realize pressure stabilizing.
In one of the embodiments, as shown in figure 4, filter circuit 102 includes second resistance R2 and first capacitor C1；The
The cathode of one diode D1 is grounded by first capacitor C1, one end of second resistance R2 be connected to the cathode of first diode D1 with
Between first capacitor C1, the other end of second resistance R2 connects control terminal C.
RC circuit, is also PC filter, and one of capacitor and a resistance can form simplest first-order filtering electricity
Road.In the present embodiment, the first-order filtering circuit formed using second resistance R2 and first capacitor C1, can quickly go out external control
Ripple in signal processed, so that addition is more stable in the external control signal of control terminal, to guarantee the electricity of output end output
It presses more stable.
In one of the embodiments, as shown in figure 4, voltage collection circuit 20 3rd resistor R3 and the 4th resistance R4,
One end of three resistance R3 connects output end out, and the other end of 3rd resistor R3 is grounded by the 4th resistance R4, first resistor R1's
The other end and pressure stabilizing reference circuit 30 are connected between 3rd resistor R3 and the 4th resistance R4.
In one of the embodiments, as shown in figure 4, pressure stabilizing reference circuit 30 includes pressure stabilizing standard U1 and feedback compensation
Circuit 301, feedback compensation circuit 301 are connected between the reference input R and cathode K of pressure stabilizing standard U1；Pressure stabilizing standard
The reference input R of U2 is connected between 3rd resistor R3 and the 4th resistance R4, the anode A ground connection of pressure stabilizing standard U1, pressure stabilizing
The primary side output end of the cathode connection opto-coupled feedback circuit 40 of standard U1.
Pressure stabilizing standard U1 is a kind of integrated regulator, and performance is good, price is low, is widely used in various power supply electricity
Lu Zhong.The output voltage of pressure stabilizing standard U1 can be arbitrarily arranged to from Vref (2.5V) to any value within the scope of 36V.It should
Device can replace zener diode, be applied to digital voltmeter, operational amplifier circuit, adjustable voltage source and Switching Power Supply etc..
TL431 is a kind of adjustable precise pressure stabilizing standard, parallel voltage-stabilizing integrated circuit, and TL431 has three ends (i.e. three poles),
It respectively can be equivalent to a zener diode with reference to pole R, anode A and cathode K, TL431, its working principle is that: when input electricity
Pressure increases, and output voltage increase results in output sampling and increases, and at this moment internal circuit is by adjusting making the electric current for flowing through itself
Increase, this electric current for also allowing for flowing through current-limiting resistance increases, and the pressure drop of such current-limiting resistance increases, and output voltage is equal to defeated
Enter voltage and subtract current-limiting resistance pressure drop, input voltage increases with current-limiting resistance pressure drop increase so that output voltage reduction, realizes pressure stabilizing.
In the present embodiment, TL431 is connect with feedback compensation circuit and sample circuit, and wherein sample circuit connects voltage regulator circuit
10, voltage regulator circuit 10 receives external control signal by control terminal C, and after being filtered to external control signal,
It is transmitted to voltage sampling circuit 20 (i.e. R3, R4), TL431 and opto-coupled feedback circuit 40, voltage sampling circuit 20 (i.e. R3,
R4), TL431 and opto-coupled feedback circuit 40 adjust the output voltage values of output end according to external control signal.
In one of the embodiments, as shown in figure 4, opto-coupled feedback circuit 40 includes photo-coupler U2, the 5th resistance R5
With the 6th resistance R6；Photo-coupler U2 includes the optical signal converter positioned at the light emitting diode U2A of primary side and positioned at secondary side
U2B；The signal input part of light emitting diode U2A is exported by the 5th resistance R5 connection output end, the signal of light emitting diode U2A
The cathode K of end connection pressure stabilizing standard U1；6th resistance R6 is connected to signal input part and the signal output of light emitting diode U2A
Between end；The output end of optical signal converter U2B is for connecting power supply chip, the input end grounding of optical signal converter U2B.
Photo-coupler includes primary and secondary side, and wherein primary side is equivalent to a light emitting diode U2A, and secondary side is equivalent to light letter
Number converter U2B (i.e. triode), primary circuit If is bigger, and light intensity is stronger, and the circuit I c of secondary side triode is bigger.Secondary three pole of side
The ratio of pipe Ic and primary side diode If is known as the current amplification factor of optocoupler, which varies with temperature and change, and by temperature
Degree is affected.Common photo-coupler signal has TLP521, PC817.Wherein, photo-coupler TLP521 usually with pressure stabilizing standard
(can be TL431), which is used in combination, carries out feedback regulation.In addition, R5 is feedback current-limiting resistance.
Feedback compensation circuit 401 includes the second capacitor C2, third capacitor C3 and the 7th resistance in one of the embodiments,
R7；The cathode of one end connection pressure stabilizing standard U1 of second capacitor C2, the other end of the second capacitor C2 are connected by the 7th resistance R7
It is connected between 3rd resistor R3 and the 4th resistance R4；The cathode of one end connection pressure stabilizing standard U1 of third capacitor C3, third electricity
The other end for holding C3 is connected between 3rd resistor R3 and the 4th resistance R4.
In order to make it easy to understand, as shown in figure 4, the working principle of above-mentioned adjustable output voltage circuit are as follows: voltage sampling circuit
The 4th resistance R4 in 20 connects output end with the 7th resistance R7 in opto-coupled feedback circuit 40, is inputted by control terminal C external
Signal (can be PWM square-wave signal) is controlled to voltage regulator circuit 102, is made up of first capacitor C1 and second resistance R2
External control signal is converted to d. c. voltage signal by first-order filtering circuit, and d. c. voltage signal passes through first resistor R1, third
The partial pressure of resistance R3 and the 4th resistance R4 is followed by the reference pole of pressure stabilizing standard U1, at this time output end C output voltage Vout=
Ref [1+R3/ (R4//R1)], ref are the reference data of pressure stabilizing standard TL431, usually 2.5V, and when calculating needs when need to calculate
The pressure drop for considering R1 series diode D1, it is partially electric under being changed by the voltage at the external control signal adjusting both ends first capacitor C1
The impedance of resistance, to realize that output voltage is adjustable.When first capacitor C1 both end voltage is 0V, R1 series connection D1 is in parallel with R4, this
When output voltage Vout be maximum value, when first capacitor C1 both end voltage be greater than 2.5V when, be equivalent to cutting R1 parallel resistance return
Road, output voltage Vout is minimum value at this time, and reasonable adjustment parameter can be such that output adjusts in a certain range, wider defeated
Voltage can match the load of different voltages out, and output voltage is accurate.
In one of the embodiments, further include the first inductance L1, one end of the first inductance L1 be connected to output end out and
Between 5th resistance R5, the other end of the first inductance L1 is connected between output end out and 3rd resistor R3.
Specifically, inductance is added between 3rd resistor R3 and the 5th resistance R5 to be filtered, remove in output end voltage
Some clutters so that output voltage it is more stable.
Above-mentioned adjustable output voltage circuit is due to using above-mentioned voltage regulator circuit, so, it may have voltage tune
The economize on electricity corresponding beneficial effect in road, it can by changing the external control signal of input, to change the voltage of output, and energy
Make the voltage stabilization of output.In addition, it is easy to use, it is easy to operate.
According to above-mentioned adjustable output voltage circuit, a kind of electrical equipment is additionally provided in the utility model embodiment.
A kind of electrical equipment, including the adjustable output voltage circuit in any one embodiment.
Above-mentioned electrical equipment is because using the adjustable output voltage circuit in any one embodiment, in this way, the electric appliance is set
It is standby that corresponding voltage can be adjusted according to actual application, it is easy to use.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
Above embodiments only express the several embodiments of the utility model, and the description thereof is more specific and detailed, but simultaneously
The limitation to utility model patent range therefore cannot be interpreted as.It should be pointed out that for the ordinary skill people of this field
For member, without departing from the concept of the premise utility, various modifications and improvements can be made, these belong to this reality
With novel protection scope.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (12)
1. a kind of voltage regulator circuit characterized by comprising first resistor and filter circuit；
One end of the first resistor connects the control terminal of adjustable output voltage circuit by the filter circuit, and the other end passes through
The voltage sampling circuit of the adjustable output voltage circuit connects the pressure stabilizing reference circuit of the adjustable output voltage circuit；Its
In, adjustable output voltage described in opto-coupled feedback circuit connection of the pressure stabilizing reference circuit by the adjustable output voltage circuit
The output end of circuit；The output end connects the voltage sampling circuit；
The filter circuit receives the external control signal of the control terminal input, the voltage sampling circuit, the pressure stabilizing base
Quasi- circuit and the opto-coupled feedback circuit adjust the voltage value of the output end according to the external control signal.
2. voltage regulator circuit according to claim 1, which is characterized in that further include: be connected to the first resistor with
First diode between the filter circuit；
The anode of the first diode connects the first resistor, and cathode connects the filter circuit.
3. voltage regulator circuit according to claim 2, which is characterized in that the filter circuit includes second resistance and
One capacitor；
The cathode of the first diode is grounded by the first capacitor；
One end of the second resistance is connected between the cathode of the first diode and the first capacitor, other end connection
The control terminal.
4. a kind of adjustable output voltage circuit, which is characterized in that including opto-coupled feedback circuit, pressure stabilizing reference circuit, voltage sample
Circuit, output end, control terminal and voltage regulator circuit, wherein the voltage regulator circuit includes first resistor and filter circuit；
One end of the first resistor connects the control terminal by the filter circuit, and the other end passes through the voltage sample electricity
Road connects one end of the pressure stabilizing reference circuit；The other end of the pressure stabilizing reference circuit connects the original of the opto-coupled feedback circuit
Side output end；The primary side input terminal of the opto-coupled feedback circuit connects the output end, and secondary side output end connects power supply chip；Institute
It states output end and connects the voltage sampling circuit；
The filter circuit receives the external control signal of the control terminal input, the voltage sampling circuit, the pressure stabilizing base
Quasi- circuit and the opto-coupled feedback circuit adjust the voltage value of the output end according to the external control signal.
5. adjustable output voltage circuit according to claim 4, which is characterized in that the voltage regulator circuit further includes connecting
Connect the first diode between the first resistor and the filter circuit；
The anode of the first diode connects the first resistor, and cathode connects the filter circuit.
6. adjustable output voltage circuit according to claim 5, which is characterized in that the filter circuit includes second resistance
And first capacitor；
The cathode of the first diode is grounded by the first capacitor；One end of the second resistance is connected to described first
Between the cathode of diode and the first capacitor, the other end connects the control terminal.
7. according to the described in any item adjustable output voltage circuits of claim 4-6, which is characterized in that the voltage collection circuit
Including 3rd resistor and the 4th resistance；
One end of the 3rd resistor connects the output end, and the other end passes through the 4th resistance eutral grounding；The first resistor
The other end and the pressure stabilizing reference circuit be connected between the 3rd resistor and the 4th resistance.
8. adjustable output voltage circuit according to claim 7, which is characterized in that the pressure stabilizing reference circuit includes pressure stabilizing
Standard and feedback compensation circuit；
The feedback compensation circuit is connected between the reference input and cathode of the pressure stabilizing standard；The pressure stabilizing standard
Reference input be connected between the 3rd resistor and the 4th resistance, plus earth, it is anti-that cathode connects the optocoupler
The primary side output end of current feed circuit.
9. adjustable output voltage circuit according to claim 8, which is characterized in that the opto-coupled feedback circuit includes optocoupler
Clutch, the 5th resistance and the 6th resistance；
The photo-coupler includes the optical signal converter positioned at the light emitting diode of primary side and positioned at secondary side；The light-emitting diodes
The signal input part of pipe connects the output end by the 5th resistance, and signal output end connects the yin of the pressure stabilizing standard
Pole；6th resistance is connected between the signal input part and signal output end of the light emitting diode；
The output end of the optical signal converter is for connecting the power supply chip, the input termination of the optical signal converter
Ground.
10. adjustable output voltage circuit according to claim 9, which is characterized in that the feedback compensation circuit includes the
Two capacitors, third capacitor and the 7th resistance；
One end of second capacitor connects the cathode of the pressure stabilizing standard, and the other end is connected to institute by the 7th resistance
It states between 3rd resistor and the 4th resistance；
One end of the third capacitor connects the cathode of the pressure stabilizing standard, and the other end is connected to the 3rd resistor and described
Between 4th resistance.
11. adjustable output voltage circuit according to claim 10, which is characterized in that further include the first inductance；
One end of first inductance is connected between the output end and the 5th resistance, and the other end is connected to the output
Between end and the 3rd resistor.
12. a kind of electrical equipment, which is characterized in that including the described in any item adjustable output voltage circuits of claim 4-11.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821009846.1U CN208819107U (en) | 2018-06-28 | 2018-06-28 | Voltage regulator circuit, adjustable output voltage circuit and electrical equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821009846.1U CN208819107U (en) | 2018-06-28 | 2018-06-28 | Voltage regulator circuit, adjustable output voltage circuit and electrical equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147564A (en) * | 2020-09-09 | 2020-12-29 | 浙江永泰隆电子股份有限公司 | High-precision direct-current voltage source |
| CN112911761A (en) * | 2021-04-02 | 2021-06-04 | 苏州纽克斯电源技术股份有限公司 | Regulating and controlling circuit and lighting equipment |
| CN114895741A (en) * | 2022-06-09 | 2022-08-12 | 盈帜科技（常州）有限公司 | Output voltage regulating circuit |
| WO2022199626A1 (en) * | 2021-03-23 | 2022-09-29 | 西安青松光电技术有限公司 | Power supply apparatus and electronic device |
| CN117728661A (en) * | 2023-11-14 | 2024-03-19 | 海信家电集团股份有限公司 | Voltage protection device, method and system and electronic equipment |
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2018
- 2018-06-28 CN CN201821009846.1U patent/CN208819107U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147564A (en) * | 2020-09-09 | 2020-12-29 | 浙江永泰隆电子股份有限公司 | High-precision direct-current voltage source |
| CN112147564B (en) * | 2020-09-09 | 2023-11-10 | 浙江永泰隆电子股份有限公司 | High-precision direct-current voltage source |
| WO2022199626A1 (en) * | 2021-03-23 | 2022-09-29 | 西安青松光电技术有限公司 | Power supply apparatus and electronic device |
| CN112911761A (en) * | 2021-04-02 | 2021-06-04 | 苏州纽克斯电源技术股份有限公司 | Regulating and controlling circuit and lighting equipment |
| CN112911761B (en) * | 2021-04-02 | 2022-07-22 | 苏州纽克斯电源技术股份有限公司 | Regulating and controlling circuit and lighting equipment |
| CN114895741A (en) * | 2022-06-09 | 2022-08-12 | 盈帜科技（常州）有限公司 | Output voltage regulating circuit |
| CN117728661A (en) * | 2023-11-14 | 2024-03-19 | 海信家电集团股份有限公司 | Voltage protection device, method and system and electronic equipment |
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