CN206412930U - A kind of reduction voltage circuit - Google Patents
A kind of reduction voltage circuit Download PDFInfo
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- CN206412930U CN206412930U CN201720093998.3U CN201720093998U CN206412930U CN 206412930 U CN206412930 U CN 206412930U CN 201720093998 U CN201720093998 U CN 201720093998U CN 206412930 U CN206412930 U CN 206412930U
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Abstract
The utility model is applied to circuit field there is provided a kind of reduction voltage circuit, including：Switch element, response system input voltage forms first voltage to start the reduction voltage circuit；First feedback unit, responds the first voltage to carry out positive feedback regulation to the switch element so that the switch element is on and turned off the state constantly switched；Filter unit, responds the first voltage, to export the second voltage being filtered after processing；Second feedback unit, negative-feedback regu- lation formation tertiary voltage is carried out to the second voltage, and export by the output port of reduction voltage circuit.The reduction voltage circuit that the utility model is provided, switch element is set to be on the state constantly switched with shut-off by the first feedback unit, it exports the regulation by the second feedback unit, make output voltage stabilization in setting value, the characteristics of circuit has low ripple, low noise, and cost is further reduced using discrete component.
Description
Technical field
The utility model belongs to circuit field, more particularly to a kind of reduction voltage circuit.
Background technology
In circuit field, each component work of control panel generally requires the voltage of particular range, for example, single-chip microcomputer is logical
Often need 5V or 3.3V power voltage supplies；And for example, MOSFET and IGBT drivings need 12V~15V voltage.And total electricity of control panel
Source voltage is typically higher, for example：24V, 48V, 72V or higher；Therefore, in order to maintain the normal work of control panel, it is necessary to
A relatively low voltage is obtained from general supply, is powered for single-chip microcomputer, the driving of MOSFET/IGBT or other components etc.,
Therefore need to introduce reduction voltage circuit.Certainly, it is necessary to consider the ripple and noise of power circuit emphatically while reduction voltage circuit is introduced
Influence to system.
The topological structure of a kind of Buck conversion circuit as shown in Figure 1, with the SWITCH conductings switched and shut-off, electricity
Feel the electric current in L also to fluctuate above and below the virtual value of output current, so one and the same frequencies of SWITCH also occurs in output end
The ripple of rate, general described ripple just refers to this, and its fluctuation amplitude is relevant with the capacity of output capacitance, this ripple
Frequency is identical with Switching Power Supply, usually tens to hundreds of KHz.SWITCH switches it is general from bipolar transistor or
MOSFET, regardless of, when its conducting and cut-off, can all there are a rise time and fall time, therefore at this moment
Wait just occur in circuit one it is identical with the frequency of the rise and fall time of SWITCH switches or odd number frequency multiplication make an uproar
Sound, generally tens MHz；Same diode D is in Reverse recovery moment, and its equivalent circuit is the series connection of resistance capacitance and inductance,
Resonance can be caused, the noise frequency of generation is also tens MHz；Both noises are generally referred to as high-frequency noise, amplitude generally than
Ripple is much bigger, referring to Fig. 2.Work of the high-frequency noise to single-chip microcomputer has undesirable effect, for example, can cause monolithic processor resetting, make
Run and fly into SCM program, such as program is performed entanglement, influence AD conversion precision.
Commonly used reduction voltage circuit is Buck conversion circuit at present, and Buck conversion circuit efficiency high, buck
Translation circuit usually requires, using professional chip, such as M2575/LM2595, to there is obviously defect, such as：
High expensive, ripple, noise are larger etc..
Utility model content
The utility model provides a kind of reduction voltage circuit, it is intended to solve the high expensive of existing reduction voltage circuit, ripple, noise
Larger the problem of.
The utility model is achieved in that a kind of reduction voltage circuit, including：
Switch element, response system input voltage forms first voltage to start the reduction voltage circuit；
First feedback unit, responds the first voltage to carry out positive feedback regulation to the switch element so that described
Switch element is on and turned off the state constantly switched；
Filter unit, responds the first voltage, to export the second voltage being filtered after processing；
Second feedback unit, negative-feedback regu- lation formation tertiary voltage is carried out to the second voltage, and by the decompression electricity
The output port output on road.
It is preferred that, the switch element includes：First switch module and second switch module；
The first switch module includes：Triode Q1, resistance R1；
The second switch module includes：Resistance R2, resistance R3, resistance R4, and triode Q2；
The two ends of the resistance R1 are coupled with the emitter stage of the triode Q1 with base stage respectively, the resistance R1 with it is described
The common point of triode Q1 emitter stage connects the system input voltage, the public affairs of the resistance R1 and triode Q1 base stage
The colelctor electrode of concurrent and the triode Q2 is coupled；
A termination system input voltage of the resistance R2, the other end of the resistance R2 and the one of the resistance R3
End coupling, the other end ground connection of the resistance R3, the resistance R2 and resistance R3 common point is with the triode Q2's
Base stage is coupled, and one end of the emitter stage of the triode Q2 and the resistance R4 is coupled, the other end ground connection of the resistance R4；
The colelctor electrode of the triode Q1 exports the first voltage.
It is preferred that, first feedback unit includes：Electric capacity C1 and/or resistance R5；
The electric capacity C1 and/or resistance R5 coupled in series are in the colelctor electrode of the triode Q1 and the base of the triode Q2
Between pole, the feedback signal for responding the first voltage formation is exported to the base stage of the triode Q2.
It is preferred that, the filter unit includes：Inductance L and electric capacity C2；
The first end of the inductance L and the colelctor electrode of the triode Q1 are coupled, the second end and the electricity of the inductance L
Hold C2 first end coupling, the ends of electric capacity C2 second are coupled to second feedback unit.
It is preferred that, the reduction voltage circuit also includes to return with the filter unit and second feedback unit formation afterflow
The sustained diode 1 on road, the plus earth of the sustained diode 1, the negative electrode of the sustained diode 2 is coupled to described
Triode Q1 and inductance L common point.
It is preferred that, second feedback unit has three ports, respectively first port, second port and the 3rd end
Mouthful；
The first port is coupled to the output port of the reduction voltage circuit with second port；
3rd port is coupled to the resistance R2 and the resistance R3 common point.
It is preferred that, second feedback unit includes：Triode Q3, resistance R6, and voltage-regulator diode ZD2；
The colelctor electrode of the triode Q3 is connected to the 3rd port；One end of the resistance R6 and the triode Q3
Base stage and the voltage-regulator diode ZD2 anode coupling, the other end of the resistance R6 and the triode Q3 emitter stage
Coupling, and it is connected to the first port；
The negative electrode of the voltage-regulator diode ZD2 is connected to the second port.
It is preferred that, second feedback unit includes：Resistance R7, resistance R8, resistance R9, electric capacity C3, and controllable accurate
Source of stable pressure U1；
The first end of the resistance R7 accesses the system input voltage, and the of the second end of the R7 and the electric capacity C3
One end, the negative electrode of the controllable accurate source of stable pressure U1 are coupled to the 3rd port；
The first end of the resistance R8 is coupled to the second port, and the second end of the resistance R8 is coupled to the resistance
R9 first end, the second end of the R9 is coupled to the first port；
The second end of the electric capacity C3 and the reference pole of the controllable accurate source of stable pressure U1 are coupled, and are connected to the resistance
R8 and resistance R9 common port；
The anode of the controllable accurate source of stable pressure U1 is coupled to the first port.
The reduction voltage circuit that the utility model is provided, is on switch element continuous with shut-off by the first feedback unit
The state of switching, it exports the regulation by the second feedback unit, makes output voltage stabilization in setting value, this circuit is using discrete
Element, the characteristics of with low ripple, low noise, and cost is greatly lowered.
Brief description of the drawings
Fig. 1 is a kind of structure chart for Buck conversion circuit that prior art is provided；
Fig. 2 be prior art provide power circuit in ripple, the oscillogram of noise；
Fig. 3 is a kind of electrical block diagram for reduction voltage circuit that the utility model is provided；
Fig. 4 is a kind of structural representation for outer shroud negative-feedback circuit that the utility model is provided；
Fig. 5 is the structural representation for another outer shroud negative-feedback circuit that the utility model is provided.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain
The utility model, is not used to limit the utility model.
The utility model provides a kind of reduction voltage circuit, switch element is on and is turned off by the first feedback unit
The state constantly switched, it exports the regulation by the second feedback unit, makes output voltage stabilization in setting value, this circuit is used
Discrete component, the characteristics of with low ripple, low noise, and cost is greatly lowered.
As shown in figure 3, a kind of reduction voltage circuit, the reduction voltage circuit includes：
Switch element 10, response system input voltage forms first voltage to start reduction voltage circuit；
First feedback unit 20, responds the first voltage to carry out positive feedback regulation to the switch element 10 so that
The switch element 10 is on and turned off the state constantly switched；
Filter unit 30, responds first voltage, and export the second voltage being filtered after processing；
Second feedback unit 40, the tertiary voltage of negative-feedback regu- lation formation preset voltage value is carried out to the second voltage,
And exported by the output port VOUT of reduction voltage circuit.
In embodiments of the present invention, the first backfeed loop of the feedback unit 2 of switch element 1 and first formation, it is positive feedback
Loop, therefore the first backfeed loop is also referred to as inner ring positive-feedback circuit, by the positive feedback effect of the first feedback unit 2, makes switch list
Member starts after system input voltage is received from system voltage output port VIN, and is on and turns off what is constantly switched
The voltage exported under state, the state is first voltage, therefore the waveform of first voltage is PWM waveform just staggeredly；First
Voltage is tended towards stability after its waveform is processed after filtering after the filtering process of unit 3, and it is smaller to eventually form waveform, close to straight
Flow the second voltage of waveform；And the second feedback unit 4 and switch element 1, the formation second feed back loop of filter unit 3, second is anti-
Road is fed back to for negative feedback loop, therefore the second feedback circuit is also referred to as outer shroud negative-feedback circuit, the second feedback unit 4 enters to second voltage
Row negative-feedback regu- lation, forms tertiary voltage, and export by the output port VOUT of reduction voltage circuit.This circuit uses discrete member
Part, the characteristics of with low ripple, low noise, cost is further reduced.
Above-mentioned circuit function module is realized below by way of specific circuit structure, it is possible to understand that, these are specific
Circuit structure is only used for embodying the realizability of this programme, and is not especially limited, and realizes other circuit knots of identical function
Structure is also regarded as being equivalent of the present utility model, and details are as follows.
In one embodiment of the present utility model, switch element includes：First switch module and second switch module；Its
In, first switch module includes：Triode Q1, resistance R1；Second switch module includes：Resistance R2, resistance R3, resistance R4, with
And triode Q2；Resistance R1 two ends are coupled with triode Q1 emitter stage with base stage respectively, resistance R1 and triode Q1 hair
The common point welding system input voltage of emitter-base bandgap grading, the common point of resistance R1 and triode Q1 base stage and triode Q2 colelctor electrode coupling
Connect.
A resistance R2 terminating systems input voltage, the resistance R2 other end is coupled with resistance R3 one end, resistance R3's
The other end is grounded, and resistance R2 and resistance R3 common point is coupled with triode Q2 base stage, triode Q2 emitter stage and resistance
R4 one end coupling, resistance R4 other end ground connection.
The voltage of triode Q1 colelctor electrode output is first voltage.
In the utility model embodiment, R2 and R3 constitute the start-up circuit of this reduction voltage circuit.R2 and R3 dividing point makes
Q2 conductings are obtained, and then cause Q1 conductings, so as to start this reduction voltage circuit.
Wherein, resistance 1 plays jamproof effect in circuit, it is ensured that diode Q1 shut-off is more reliable, for example, can be with
Avoid the improper conducting of triode Q1 caused by the weak interference electric current that the interference voltage in system input voltage formed.
Resistance R4 serves the effect of buffer current in circuit, electric current is not changed suddenly, it is to avoid to circuit
Cause to damage, or influence the normal work of circuit.
In one embodiment of the present utility model, the first feedback unit 20 includes：Electric capacity C1 and/or resistance R5；Electric capacity
C1 and/or resistance R5 coupled in series will respond first voltage between triode Q1 colelctor electrode and triode Q2 base stage
The feedback signal of formation is exported to triode Q2 base stage.
In the utility model embodiment, the first feedback unit 20 can be each separately formed by C1 or R5, or two
Person is composed in series, certainly, when C1 and R5 are each separately formed the first feedback unit 20, and its effect does not have what both were composed in series
Effect is good；Therefore the utility model embodiment preferably the first feedback unit 20 is included by C1 and circuit in series R5, first
Feedback unit 20 constitutes positive feedback loop with switch element 10.When Q1 has conducting trend, positive feedback loop accelerates Q2 conducting,
So as to accelerate Q1 conducting simultaneously；When Q1 has shut-off trend, positive feedback loop accelerates Q2 shut-off, so as to accelerate simultaneously
Q1 shut-off；Therefore, positive-feedback circuit causes Q1 to be on and turn off the state constantly switched, so as to form what height interlocked
PWM waveform.
Wherein, resistance R5 serves the effect of buffer current in circuit, electric current is not changed suddenly, it is to avoid right
Circuit causes to damage, or influences the normal work of circuit.
In one embodiment of the present utility model, filter unit 30 includes：Inductance L and electric capacity C2；Inductance L first end
Coupled with triode Q1 colelctor electrode, inductance L the second end is coupled with electric capacity C2 first end, the ends of electric capacity C2 second are coupled to the
Two feedback units 40.First voltage is after filtering after the filtering process of unit 3, and the dentation waveform that its height interlocks tends towards stability,
Eventually form that waveform is smaller, close to the second voltage of DC waveform.
In one embodiment of the present utility model, this reduction voltage circuit also includes can be with the feedback of filter unit 30 and second
Member 40 forms the sustained diode 1 of continuous current circuit, the plus earth of sustained diode 1, the negative electrode coupling of sustained diode 2
In triode Q1 and inductance L common point.
In the utility model, in continuous conducting and off state, therefore, afterflow due to diode Q1 operationally
Diode D1 can ensure that the circuit of next stage may be constructed normal loop when Q1 is turned off.
In one embodiment of the present utility model, the second feedback unit has three ports, respectively first port 1,
The port 3 of second port 2 and the 3rd.
First port 1 is coupled to the output port VOUT of reduction voltage circuit with second port 2；
3rd port 3 is coupled to resistance R2 and resistance R3 common point.
In the utility model embodiment, reduction voltage circuit constitutes outer shroud negative-feedback electricity based on the second feedback unit 40
Road, with the level for the equalization point for adjusting inner ring positive-feedback circuit, the equalization point is triode Q2 base at triode Q2 base stage
Pole is using a certain level as equalization point, and the magnitude of voltage of the level is by the setting of system input voltage, with reference to resistance R2 and resistance R3
Partial pressure regulation, and with inner ring positive-feedback circuit positive feedback effect and up-down vibration.
Wherein, second port 2 and first port 1 connect the output port of reduction voltage circuit, and the output port of reduction voltage circuit includes
Output port VOUT and earth terminal GND, i.e. second port 2 meet output port VOUT, and first port 1 is connected with earth terminal GND,
When output port VOUT is higher than setting value, the level reduction of the 3rd port 3；When output port VOUT is less than setting value, the
The level rise of three ports 3.
Outer shroud negative-feedback circuit can adjust the level of the equalization point of inner ring positive-feedback circuit, so as to adjust output port
VOUT output voltage；The level of equalization point is higher, and output port VOUT output voltage is bigger；The level of equalization point is lower,
Output port VOUT output voltage is smaller.
In a kind of embodiment of the present utility model, as Fig. 4 shows a kind of way of realization of outer shroud negative-feedback circuit, in detail
State as follows：
Second feedback unit includes：Triode Q3, resistance R6, and voltage-regulator diode ZD2；
Wherein, triode Q3 colelctor electrode is connected to the 3rd port 3；Resistance R6 one end is with triode Q3 base stage and surely
Diode ZD2 anode coupling is pressed, the resistance R6 other end is coupled with triode Q3 emitter stage, and is connected to first port 1；
Voltage-regulator diode ZD2 negative electrode is connected to second port 2.
Detailed, it is assumed that the default output voltages of output port VOUT are 4.9V, and voltage-regulator diode ZD2 voltage stabilizing value is
4.9V (only for example, being not construed as limiting), wherein, first port 1 is grounded.
When the voltage (voltage for being equal to output port VOUT) of second port 2 is higher than 4.9V, then triode Q3 conductions
Enhancing, so that the level reduction of the level reduction of the 3rd port 3, i.e. triode Q2 base stage, so that triode Q2's becomes
In cut-off again, then triode Q2 promotes triode Q1 to tend to cut-off, the first of triode Q1 colelctor electrode output is ultimately resulted in
Voltage entire lowering, so that output port VOUT output voltage reduction, to approach setting value.
When the voltage of second port 2 is less than 4.9V, triode Q3 conductions weaken or ended, then the electricity of the 3rd port 3
The level rise of flat rise, i.e. triode Q2 base stage, so as to promote triode Q2 to turn on, triode Q2 conducting promotes three again
Pole pipe Q1 conducting, so that the first voltage integral raising of triode Q1 colelctor electrode output, so that output port VOUT
Output voltage rise, to approach setting value.
In another embodiment of the present utility model, as Fig. 5 shows that the another of outer shroud negative-feedback circuit realizes shape
Formula, details are as follows：
Second feedback unit includes：Resistance R7, resistance R8, resistance R9, electric capacity C3, and controllable accurate source of stable pressure U1；
Resistance R7 first end access system input voltage, R7 the second end and electric capacity C3 first end, controllable accurate are steady
Potential source U1 negative electrode is coupled to the 3rd port；
Resistance R8 first end is coupled to second port, and resistance R8 the second end is coupled to resistance R9 first end, R9's
Second end is coupled to first port；
Electric capacity C3 the second end is coupled with controllable accurate source of stable pressure U1 reference pole, and is connected to resistance R8 and resistance R9's
Common port；
Controllable accurate source of stable pressure U1 anode is coupled to first port.
Detailed, for example, setting the default output voltages of output port VOUT as 5V, controllable accurate source of stable pressure U1 is
TL431, its reference voltage be 2.5V, R8=R9=2K (only for example, being not construed as limiting), wherein, first port 1 is grounded.
When the voltage (voltage for being equal to output port VOUT) of second port 2 is higher than 5V, then made by R8, R9 partial pressure
With the voltage of controllable accurate source of stable pressure U1 reference pole is more than 2.5V, therefore TL431 conductions strengthen, so that the 3rd port 3
Level reduction, i.e., triode Q2 base stage level reduction so that triode Q2 tend to cut-off, then triode Q2 is again
Promote triode Q1 to tend to cut-off, the first voltage entire lowering of triode Q1 colelctor electrode output is ultimately resulted in, so that defeated
Exit port VOUT output voltage reduction, to approach setting value.
When the voltage of second port 2 is less than 5V, acted on by R8, R9 partial pressure, controllable accurate source of stable pressure U1 reference
The voltage of pole is less than 2.5V, therefore TL431 conductions weaken or ended, then the level rise of the 3rd port 3, i.e. triode Q2's
The level rise of base stage, so as to promote triode Q2 to turn on, triode Q2 conducting promotes triode Q1 conducting again, so that
The first voltage integral raising of triode Q1 colelctor electrode output, so that output port VOUT output voltage rise, to connect
Nearly setting value.
The reduction voltage circuit that above-mentioned utility model embodiment is provided, by the first feedback unit make switch element be on
The state constantly switched is turned off, it exports the regulation by the second feedback unit, makes output voltage stabilization in setting value, this circuit
The characteristics of with low ripple, low noise, and cost is further reduced using discrete component.
In general, being 2-10 times of the discrete element that this programme is used using special chip its cost, in batch
In production process, this programme has huge cost advantage.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Any modifications, equivalent substitutions and improvements made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (8)
1. a kind of reduction voltage circuit, it is characterised in that including：
Switch element, response system input voltage forms first voltage to start the reduction voltage circuit；
First feedback unit, responds the first voltage to carry out positive feedback regulation to the switch element so that the switch
Unit is on and turned off the state constantly switched；
Filter unit, responds the first voltage, to export the second voltage being filtered after processing；
Second feedback unit, negative-feedback regu- lation formation tertiary voltage is carried out to the second voltage, and pass through the defeated of reduction voltage circuit
Exit port is exported.
2. reduction voltage circuit as claimed in claim 1, it is characterised in that the switch element includes：First switch module and the
Two switch modules；
The first switch module includes：Triode Q1, resistance R1；
The second switch module includes：Resistance R2, resistance R3, resistance R4, and triode Q2；
The two ends of the resistance R1 are coupled with the emitter stage of the triode Q1 with base stage respectively, the resistance R1 and three pole
The common point of pipe Q1 emitter stage connects the system input voltage, the common point of the resistance R1 and triode Q1 base stage
Coupled with the colelctor electrode of the triode Q2；
A termination system input voltage of the resistance R2, one end coupling of the other end of the resistance R2 and the resistance R3
Connect, the other end ground connection of the resistance R3, the resistance R2 and resistance R3 common point and the base stage of the triode Q2
Coupling, one end of the emitter stage of the triode Q2 and the resistance R4 is coupled, the other end ground connection of the resistance R4；
The colelctor electrode of the triode Q1 exports the first voltage.
3. reduction voltage circuit as claimed in claim 2, it is characterised in that first feedback unit includes：Electric capacity C1 and/or electricity
Hinder R5；
The electric capacity C1 and/or resistance R5 coupled in series in colelctor electrode and the triode Q2 of the triode Q1 base stage it
Between, the feedback signal for responding the first voltage formation is exported to the base stage of the triode Q2.
4. reduction voltage circuit as claimed in claim 2, it is characterised in that the filter unit includes：Inductance L and electric capacity C2；
The first end of the inductance L and the colelctor electrode of the triode Q1 are coupled, the second end of the inductance L and the electric capacity C2
First end coupling, the ends of electric capacity C2 second are coupled to second feedback unit.
5. reduction voltage circuit as claimed in claim 4, it is characterised in that the reduction voltage circuit also includes can be with the filter unit
And second feedback unit forms the sustained diode 1 of continuous current circuit, the plus earth of the sustained diode 1 is described
The negative electrode of sustained diode 2 is coupled to the triode Q1 and the inductance L common point.
6. reduction voltage circuit as claimed in claim 5, it is characterised in that second feedback unit has three ports, respectively
For first port, second port and the 3rd port；
The first port is coupled to the output port of the reduction voltage circuit with second port；
3rd port is coupled to the resistance R2 and the resistance R3 common point.
7. reduction voltage circuit as claimed in claim 6, it is characterised in that second feedback unit includes：Triode Q3, resistance
R6, and voltage-regulator diode ZD2；
The colelctor electrode of the triode Q3 is connected to the 3rd port；One end of the resistance R6 and the base of the triode Q3
Pole and the voltage-regulator diode ZD2 anode coupling, the emitter stage of the other end of the resistance R6 and the triode Q3 are coupled,
And it is connected to the first port；
The negative electrode of the voltage-regulator diode ZD2 is connected to the second port.
8. reduction voltage circuit as claimed in claim 6, it is characterised in that second feedback unit includes：Resistance R7, resistance
R8, resistance R9, electric capacity C3, and controllable accurate source of stable pressure U1；
The first end of the resistance R7 accesses the system input voltage, the second end of the R7 and the first of the electric capacity C3
End, the negative electrode of the controllable accurate source of stable pressure U1 are coupled to the 3rd port；
The first end of the resistance R8 is coupled to the second port, and the second end of the resistance R8 is coupled to the resistance R9's
First end, the second end of the R9 is coupled to the first port；
The second end of the electric capacity C3 and the controllable accurate source of stable pressure U1 reference pole are coupled, and be connected to the resistance R8 with
Resistance R9 common port；
The anode of the controllable accurate source of stable pressure U1 is coupled to the first port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720093998.3U CN206412930U (en) | 2017-01-24 | 2017-01-24 | A kind of reduction voltage circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720093998.3U CN206412930U (en) | 2017-01-24 | 2017-01-24 | A kind of reduction voltage circuit |
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| Publication Number | Publication Date |
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| CN206412930U true CN206412930U (en) | 2017-08-15 |
Family
ID=59556867
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720093998.3U Active CN206412930U (en) | 2017-01-24 | 2017-01-24 | A kind of reduction voltage circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108986325A (en) * | 2018-06-19 | 2018-12-11 | 昆明理工大学 | A kind of intellectual water meter metering control system based on RF chip |
| CN111245227A (en) * | 2020-03-25 | 2020-06-05 | 美的集团股份有限公司 | Power supply circuit, circuit board and vehicle-mounted air conditioner |
-
2017
- 2017-01-24 CN CN201720093998.3U patent/CN206412930U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108986325A (en) * | 2018-06-19 | 2018-12-11 | 昆明理工大学 | A kind of intellectual water meter metering control system based on RF chip |
| CN108986325B (en) * | 2018-06-19 | 2021-01-05 | 昆明理工大学 | Intelligent water meter metering control system based on RF chip |
| CN111245227A (en) * | 2020-03-25 | 2020-06-05 | 美的集团股份有限公司 | Power supply circuit, circuit board and vehicle-mounted air conditioner |
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