CN207216474U - A kind of current sample change-over circuit and LED constant current power supply - Google Patents
A kind of current sample change-over circuit and LED constant current power supply Download PDFInfo
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- CN207216474U CN207216474U CN201721105978.XU CN201721105978U CN207216474U CN 207216474 U CN207216474 U CN 207216474U CN 201721105978 U CN201721105978 U CN 201721105978U CN 207216474 U CN207216474 U CN 207216474U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model discloses a kind of current sample change-over circuit and LED constant current power supply, the current sample change-over circuit includes constant current chip control circuit, current sampling unit, first resistor, second resistance, one end of first resistor is connected with one end of sample rate current port and second resistance, the other end ground connection of first resistor, the other end of second resistance is connected with constant current chip control circuit and the current sampling unit, and constant current chip control circuit controls the output of sample rate current using the open switch of the current sampling unit；Constant-current supply includes current sampling circuit, EMI filter circuit, half-bridge harmonic circuit, rectifying and wave-filtering output circuit and power factor correction circuit.The utility model passes through each circuit cooperating, hoisting power factor value and harmonics restraint.In addition, the electric current of the utility model main line is not passed through toggle switch, toggle switch is protected；And cost does not have any purpose for increasing and reaching current sample yet, product reliability is improved.
Description
Technical field
It the utility model is related to LED drive power field, more particularly to a kind of current sample change-over circuit and LED perseverances
Flow power supply.
Background technology
LED lamp is the light source of little power consumption in existing light fixture product, luminous efficiency height, energy-conservation and service life length, extensively
It is general to be applied in daily life, it is the favorable substitutes of fluorescent lamp, but in replacement process, LED is as a kind of direct current work(
Rate losser, only it can just be lighted under appropriate D/C voltage and electric current, the output dc voltage of LED drive power can not be low
In LED or the forward drop of LED strip.When shelves LED drive power parallel connection LED or the LED strip being in parallel, due to each
LED C-V characteristic has differences, and the forward current difference in identical forward voltage is larger, if powered using constant pressure,
Each LED brightness and colourity can be caused larger difference to be present, therefore require constant current rather than constant pressure driving, in general,
LED drive power allows for providing nominal constant electric current and constant voltage simultaneously.
Original LED constant current source product, the setting of its output current, the electric current of the main circuit by directly using primary side
Parameter, it is configured, and there is the electric current of main circuit is excessive, additional device work(needed for current sampling devices and current sample
Rate loss is big, and it is resistance that current sample, which is typically selected, and electric current additional device typically selects toggle switch, its electric stress being subject to
Greatly, component failure is easily caused；And this circuit effectively reduces the current stress of toggle switch by changing the value of sampled voltage, with
Reach solution problem above.
In the prior art, the electric current that toggle switch is main circuit, the excessive electric current for being well over toggle switch of electric current are flowed through
Limit value.
Utility model content
In view of this, it is necessary to a kind of current sample change-over circuit applied to LED power is provided, solves and passes through dial-up
The problem of electric current of switch is excessive.
The utility model is realized according to following technical scheme：
A kind of current sample change-over circuit applied to LED power, it is characterised in that the current sample change-over circuit includes
Constant current chip control circuit, current sampling unit, sample rate current input port, first resistor, second resistance, the first resistor
One end be connected with one end of the sample rate current input port and the second resistance, another termination of the first resistor
Ground, the other end of the second resistance are connected with constant current chip control circuit and the current sampling unit, the constant current core
The detection magnitude of voltage of piece control circuit is a steady state value, cut-offs control using at least one switch of the current sampling unit
Flow through the size of the electric current of the current sampling unit.
Further, the current sample change-over circuit also includes 3rd resistor, the 3rd resistor and the current sample
Unit is in parallel, and one end of the 3rd resistor is connected between the constant current chip control circuit and second resistance, and the described 3rd
The other end ground connection of resistance.
Further, the first resistor, the second resistance and 3rd resistor are multiple resistant series or parallel connection
Connection forms.
Further, the current sampling unit includes the 4th resistance and first switch, the first switch and the 4th electricity
Resistance is connected in series, in parallel with 3rd resistor again after being connected in series, one end ground connection for the end points that parallel connection is formed, the other end and the perseverance
Flow chip control circuit connection.
Further, the current sampling unit also includes the 5th resistance and second switch, the second switch and the 5th
Resistant series connect, it is in parallel with 3rd resistor again after being connected in series, parallel connection formed end points one end be grounded, the other end with it is described
Constant current chip control circuit connects.
Further, the current sampling unit also includes the 6th resistance and the 3rd switch, the 3rd switch and the 6th
Resistant series connect, it is in parallel with 3rd resistor again after being connected in series, parallel connection formed end points one end be grounded, the other end with it is described
Constant current chip control circuit connects.
Further, the current sampling unit also includes the 7th resistance and the 4th switch, the 4th switch and the 7th
Resistant series connect, it is in parallel with 3rd resistor again after being connected in series, parallel connection formed end points one end be grounded, the other end with it is described
Constant current chip control circuit connects.
Further, the first switch, second switch, third switch, the 4th switch are opened for toggle switch or rotation
Close.
A kind of LED constant current power supply of the present utility model, including above-mentioned current sampling circuit and EMI filter circuits,
Half-bridge harmonic circuit, rectifying and wave-filtering output circuit, the input of the input connection power supply of the EMI filter circuit, described half
Bridge harmonic circuit is connected with the rectifying and wave-filtering output circuit, it is characterised in that：It is humorous in the EMI filter circuit and the half-bridge
Power factor correction circuit is connected between wave circuit, the power factor correction circuit includes diode D1, diode D2, two
Pole pipe D3, diode D4, electrochemical capacitor C10, wherein, diode D1 negative electrode is connected with diode D2 negative electrode, diode D1
Anode be connected with diode D4 negative electrode, diode D2 anode is connected with diode D3 negative electrode, diode D3 anode
It is connected and is grounded with diode D4 anode, electrochemical capacitor C10 positive pole is connected with diode D1 negative electrode, electrochemical capacitor C10
Negative pole be connected with diode D3 anode.
Preferably, the power factor correction circuit also includes diode D5, diode D6, diode D7, diode
D8, electric capacity C3, electric capacity C4, electric capacity C6, diode D5 are connected in parallel with electric capacity C3, and diode D5 is connected to diode D3 and electrolysis
Between electric capacity C10, diode D5 negative electrode is connected with diode D3 anode, and diode D5 anode is with electrochemical capacitor C10's
Negative electrode and diode D8 anode are connected, and diode D6 negative electrode is connected with diode D1 anode, diode D7 negative electrode
It is connected with diode D2 anode, diode D6 anode is connected with diode D7 anode and is grounded by electric capacity C6, two poles
Pipe D6 anode is simultaneously connected with diode D8 negative electrode, and diode D4 anode is grounded by electric capacity C4.
Compared with prior art, the utility model has following technique effect：
The electric current of the utility model main line is not passed through toggle switch, the electric current very little of toggle switch, reaches electric current far away
Limit value, toggle switch is protected, extend the life-span of toggle switch, and the cost of LED constant current source does not have any increase, reaches yet
The purpose of current sample, improves product reliability.
Brief description of the drawings
Embodiment of the present utility model is described below in conjunction with accompanying drawing, wherein：
Fig. 1 is the current sample change-over circuit schematic diagram of the present utility model applied to LED power；
Fig. 2 is the schematic diagram of LED constant current power supply of the present utility model；
Fig. 3 is the circuit diagram of a specific embodiment of LED constant current power supply of the present utility model；
Reference：1-EMI filter circuits, 2- power factor correction circuits, 3- half-bridge harmonic circuits, 4- rectifying and wave-filterings
Output circuit, 5- constant current chip control circuits, 6- current sampling units.
Embodiment
Specific embodiment of the utility model is further elaborated below based on accompanying drawing.It should be appreciated that herein
Described specific embodiment is only used as embodiment, is not used to limit the scope of protection of the utility model.
The current sample change-over circuit schematic diagram applied to LED power that Fig. 1 is, as shown in figure 1, of the present utility model one
Current sample change-over circuit of the kind applied to LED power, including constant current chip control circuit, current sampling unit 6, sample rate current
Input port, first resistor, second resistance, one end of the first resistor and the sample rate current input port and described the
One end connection of two resistance, the other end ground connection of the first resistor, the other end and the constant current chip of the second resistance control
Circuit 5 and the current sampling unit 6 connect, and the detection magnitude of voltage of the constant current chip control circuit 5 is a steady state value, profit
With the size cut-off control and flow through the electric current of the current sampling unit of at least one switch of the current sampling unit 6.
Wherein, constant current chip control circuit uses RED2511 chips, and the chip is an advanced COMS control chip,
For the LLC converter that resonates, RED2511 is using control self-oscillation converter scheme, and driving two is low in semibridge system configuration
The topological structure of RediSem LLC converter technologies is optimized for cost bipolar transistor, RED2511 chips.
The current sample change-over circuit of the present utility model also includes 3rd resistor, and the 3rd resistor is adopted with the electric current
Sample unit 6 is in parallel, and one end of the 3rd resistor is connected between the constant current chip control circuit and second resistance, and described the
The other end ground connection of three resistance.The first resistor, the second resistance and 3rd resistor are for multiple resistant series or simultaneously
Connection connection forms.
The current sampling unit includes the 4th resistance and first switch, and the first switch connects with the 4th resistant series
Connect, in parallel with 3rd resistor again after being connected in series, one end ground connection for the end points that parallel connection is formed, the other end and the constant current chip control
Circuit connection processed.The current sampling unit also includes the 5th resistance and second switch, the second switch and the 5th resistance string
Connection connection, in parallel with 3rd resistor again after being connected in series, one end ground connection for the end points that parallel connection is formed, the other end and the constant current core
Piece control circuit connects.Further, the current sampling unit also includes the 6th resistance and the 3rd switch, the 3rd switch
It is connected with the 6th resistant series, in parallel with 3rd resistor again after being connected in series, one end ground connection for the end points that parallel connection is formed, the other end
It is connected with the constant current chip control circuit.Further, the current sampling unit also includes the 7th resistance and the 4th switch,
4th switch is connected with the 7th resistant series, in parallel with 3rd resistor again after being connected in series, and the one of the end points that parallel connection is formed
End ground connection, the other end are connected with the constant current chip control circuit.
With reference to accompanying drawing 1, current sample conversion work principle of the present utility model is as follows：
Set first resistor RfAs the setting resistance of the current sample change-over circuit, constant current chip control circuit is set
Detection magnitude of voltage is Vsense, wherein VsenseFor a steady state value, the current value size for being set by current sampling unit is Isense,
The resistance value size of setting electric current sampling unit is Rsense, then have Isense=Vsense/Rsense, wherein RsenseIt is according to dial-up
What the size of the parallel resistance being switched on and off of switch or rotary switch determined, it is possible thereby to learn, pass through first resistor
RfMagnitude of voltage VfSize is： Vf=Vsense+Isense·Rs, wherein, RsFor second resistance, pass through first resistor RfElectric current it is big
Small IfFor： If=Vf/Rf=(Vsense+Isense·Rs)/Rf, finally calculate sampling input current IcSize, Ic=If+
Isense。
To IcFurther simplify, obtain：
It was found from above formula, due to detecting magnitude of voltage VsenseFor definite value, RfAnd RsAlso it is definite value, as long as therefore by adjusting electricity
Flow the resistance value R of sampling unitsenseSize can then adjust the size of sampling input current.And pass through first switch K1, second
Switch K2, the 3rd switch K3, the 4th switch K4Any switch closure or the resistance of current sampling unit can be changed when disconnecting
Value Rsense, can thus change the current value size of current sampling unit.
According to the connection in series-parallel principle of circuit, as setting second resistance RsResistance be sized substantially larger than first resistor RfElectricity
During resistance, then obtain：
Due to VsenseFor steady state value, RfAlso it is definite value, settingOn the basis of electric current,
Then have
Specifically, R is worked assenseMuch larger than RsWhen, then have
Work as Rsense=RsWhen, then have
Work as Rsense=1/2RsWhen, then have
By that analogy, by adjusting RsenseWith RsRatio size be adjustable input current and reference current relation.
Further, since second resistance R is setsResistance size be much larger than first resistor RfResistance value, therefore flow through second
Resistance RsElectric current be just much smaller than first resistor RfElectric current, the electric current for flowing through toggle switch is not more than the electric current of toggle switch
Limit value, toggle switch is protected, extend the life-span of toggle switch.
In specific embodiment of the utility model, composition first resistor is connected in parallel using resistance R5 and resistance R6, adopted
By the use of R9 as second resistance, three resistance of ground are not accessed.Current sampling unit, electric current are formed using three resistance and three switches
Sampling unit with any resistor coupled in parallel, specifically, not refer to Fig. 3, the utility model by set resistance R20, R21,
R22 switchs formation current sampling unit in parallel of connecting again with each, and those skilled in the art can be arranged as required to multiple switch
With corresponding resistant series, and it is in parallel between each other form current sampling unit, the utility model is not limited this.
According to the demand specifically applied, switch of the present utility model is toggle switch or rotary switch.Specifically, originally
Utility model uses toggle switch, by setting being switched on and off for toggle switch, realizes the parallel connection of three resistance multiple combinations
Connection, obtains the resistance size of different parallel resistances.
For current sample change-over circuit of the present utility model in LED constant-current supply, refer to accompanying drawing 2, this practicality is new
A kind of LED constant current power supply of type, including：Above-mentioned current sample change-over circuit and EMI filter circuit 1, half-bridge harmonic circuit 3,
Rectifying and wave-filtering output circuit 4, the input of the input connection AC power of the EMI filter circuit 1, the half-bridge harmonic wave electricity
Road 3 is connected with the rectifying and wave-filtering output circuit 4.Wherein, EMI filter circuit 1 is typically connected on AC network and HF switch electricity
Between the power conversion circuit in source, its main function is to suppress Switching Power Supply in itself to the counter-measure of AC network, while also press down
The High-frequency Interference that system is scurried into the AC network of Switching Power Supply.
EMI filter circuit 1 includes suppressing filter capacitor and common-mode choke coil, and wherein electric capacity is shunt capacitance, is act as
The High-frequency Interference of suppression city net input, two number of turn identical coils being wound in same closed circuit magnet ring, if it is defeated in Same Name of Ends
Enter same direction current, forward shouting pain can be just produced in magnet ring, effect is to suppress the common mode disturbances of city's net input.Common-mode choke magnet ring
Using the good core material of air-gap-free high frequency characteristics, coil uses Double-wire parallel wound preparation method, and suitably increase turn-to-turn away from
From to reduce its distribution capacity, raising frequency characteristic.
The operation principle of wherein EMI filter circuit 1 is：When the utility grid of input has common-mode noise, direction identical is made an uproar
Acoustoelectric current produces two magnetic fluxs in coil, and due to forward connecting, magnetic flux is added, and inductance shows high impedance, prevents common mode from making an uproar
Sound access switch power supply, while also prevent noise caused by Switching Power Supply from being spread to public utility grid, in order to avoid pollution alternating current
Net.
And half-bridge harmonic circuit 3 is linked together in the form of totem, and exported, there is provided square-wave signal, realize
Constant current output.Rectifying and wave-filtering output circuit carries out rectifying and wave-filtering in order to adapt to the requirement of LED load characteristic, to its output current,
Extend LED service life.It is well known that EMI filter circuit 1, half-bridge harmonic circuit 3 and rectifying and wave-filtering output circuit 4 are
Circuit known by those skilled in the art, as shown in figure 3, no longer describing in detail herein.
The utility model is connected with power factor correction circuit between EMI filter circuit 1 and the half-bridge harmonic circuit 3
2, it refer to shown in accompanying drawing 3, power factor correction circuit 2 including diode D1 of the present utility model, diode D2, diode
D3, diode D4, electrochemical capacitor C10, wherein, diode D1 negative electrode is connected with diode D2 negative electrode, diode D1 sun
Pole is connected with diode D4 negative electrode, and diode D2 anode is connected with diode D3 negative electrode, diode D3 anode and two
Pole pipe D4 anode is connected and is grounded, and electrochemical capacitor C10 positive pole is connected with diode D1 negative electrode, and electrochemical capacitor C10's is negative
Pole is connected with diode D3 anode.
Further, the power factor correction circuit also includes diode D5, diode D6, diode D7, diode
D8, electric capacity C3, electric capacity C4, electric capacity C6, diode D5 are connected in parallel with electric capacity C3, and diode D5 is connected to diode D3 and electrolysis
Between electric capacity C10, diode D5 negative electrode is connected with diode D3 anode, and diode D5 anode is with electrochemical capacitor C10's
Negative electrode and diode D8 anode are connected, and diode D6 negative electrode is connected with diode D1 anode, diode D7 negative electrode
It is connected with diode D2 anode, diode D6 anode is connected with diode D7 anode and is grounded by electric capacity C6, two poles
Pipe D6 anode is simultaneously connected with diode D8 negative electrode, and diode D4 anode is grounded by electric capacity C4.The utility model leads to
Cross and set eight diodes to realize that passive power factor is corrected, further increase the power factor (PF) of the circuit.
One of the present utility model specific implementation in, as shown in figure 3, power factor correction circuit of the present utility model with
Half-bridge resonance circuit cooperating, hoisting power factor value and harmonics restraint, its operation principle are as follows：
Electric capacity C4 and electric capacity C6 is partiting dc capacitor and forms vibration with inductance L2, inductance L, triode Q1, triode Q2
Loop, the virtual value of its high-frequency current are controlled by IC, are basically unchanged.Electric capacity C3 is BOOST electric capacity, selects suitable electric capacity
Value so that electric capacity C3 maximum operating voltage is between Vin crest voltages and electric capacity C10 voltages.The sourcing current of input power, when
Inductance L extremely sine wave forward direction when, pass through diode D1, half-bridge harmonic circuit and electric capacity C6, diode D7 and electric capacity C4, two poles
Pipe D3 forms loop, pump electric current from inductance L2, inductance L, triode Q1, triode Q2, electric capacity C6, diode D7 and electric capacity C4,
Diode D3, when half-bridge harmonic circuit constantly vibrates, the continuous impulse electricities of electric capacity C3 so that input current ripple it is substantially continuous and
Follow the waveform of input voltage；When inductance L extremely sine wave negative senses, with during forward direction on the contrary, the sourcing current of input power, passes through
Diode D2, half-bridge harmonic circuit and electric capacity C6, diode D6 and electric capacity C4, diode D4 form loop, and pump electric current is from inductance
L2, inductance Lm, triode Q1, triode Q2, electric capacity C6, diode D7 and electric capacity C4, diode D3, in half-bridge harmonic circuit not
During disconnected vibration, the continuous impulse electricities of electric capacity C3 so that input current ripple is substantially continuous and follows the waveform of input voltage.So
When in whole cycle, input current and input voltage basic synchronization, power factor are effectively improved.
The utility model also includes peripheral circuit known in the art, and it is the skill known by those skilled in the art
Art, it will not be repeated here.
Compared with prior art, because constant-current supply has used current sample change-over circuit of the present utility model, due to setting
The resistance size for putting second resistance R2 is much larger than first resistor R1 resistance value, therefore the electric current for flowing through second resistance R2 is just remote small
In first resistor R1 electric current, the electric current for flowing through toggle switch is not more than the current limit of toggle switch, protects dial-up to open
Close, extend the life-span of toggle switch.In addition, the i.e. adjustable input current of ratio size and reference current by adjusting Rs and R2
Relation, and the cost of constant-current source does not have any increase, also by the purpose to current sample, improves product reliability.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
The spirit of utility model and interior the made all any modification, equivalent and improvement of principle etc., should be included in the utility model
Protection domain within.
Claims (10)
1. a kind of current sample change-over circuit applied to LED power, it is characterised in that the current sample change-over circuit includes perseverance
Chip control circuit, current sampling unit, sample rate current input port, first resistor, second resistance are flowed, the first resistor
One end is connected with one end of the sample rate current input port and the second resistance, another termination of the first resistor
Ground, the other end of the second resistance are connected with constant current chip control circuit and the current sampling unit, the constant current core
The detection magnitude of voltage of piece control circuit is a steady state value, cut-offs control using at least one switch of the current sampling unit
Flow through the size of the electric current of the current sampling unit.
2. the current sample change-over circuit according to claim 1 applied to LED power, it is characterised in that the electric current is adopted
Sample change-over circuit also includes 3rd resistor, and the 3rd resistor is in parallel with the current sampling unit, and the one of the 3rd resistor
End is connected between the constant current chip control circuit and second resistance, the other end ground connection of the 3rd resistor.
3. the current sample change-over circuit according to claim 2 applied to LED power, it is characterised in that described first
Resistance, the second resistance and 3rd resistor are that multiple resistant series or parallel connection form.
4. the current sample change-over circuit according to claim 3 applied to LED power, it is characterised in that the electric current
Sampling unit includes the 4th resistance and first switch, and the first switch is connected with the 4th resistant series, after being connected in series again with
3rd resistor is in parallel, and one end ground connection for the end points that parallel connection is formed, the other end is connected with the constant current chip control circuit.
5. the current sample change-over circuit according to claim 4 applied to LED power, it is characterised in that the electric current
Sampling unit also includes the 5th resistance and second switch, and the second switch is connected with the 5th resistant series, after being connected in series again
In parallel with 3rd resistor, one end ground connection for the end points that parallel connection is formed, the other end is connected with the constant current chip control circuit.
6. the current sample change-over circuit according to claim 5 applied to LED power, it is characterised in that the electric current
Sampling unit also includes the 6th resistance and the 3rd switch, and the 3rd switch is connected with the 6th resistant series, after being connected in series again
In parallel with 3rd resistor, one end ground connection for the end points that parallel connection is formed, the other end is connected with the constant current chip control circuit.
7. the current sample change-over circuit according to claim 6 applied to LED power, it is characterised in that the electric current
Sampling unit also includes the 7th resistance and the 4th switch, and the 4th switch is connected with the 7th resistant series, after being connected in series again
In parallel with 3rd resistor, one end ground connection for the end points that parallel connection is formed, the other end is connected with the constant current chip control circuit.
8. the current sample change-over circuit according to claim 7 applied to LED power, it is characterised in that described first
Switch, second switch, the 3rd switch, the 4th switch are toggle switch or rotary switch.
9. a kind of LED constant current power supply, including the current sampling circuit described in the claims any one of 1-8 and EMI filtering
Circuit, half-bridge harmonic circuit, rectifying and wave-filtering output circuit, the input of the input connection power supply of the EMI filter circuit, institute
Half-bridge harmonic circuit is stated to be connected with the rectifying and wave-filtering output circuit, it is characterised in that：In the EMI filter circuit and described half
Power factor correction circuit is connected between bridge harmonic circuit, the power factor correction circuit includes diode D1, diode
D2, diode D3, diode D4, electrochemical capacitor C10, wherein, diode D1 negative electrode is connected with diode D2 negative electrode, two poles
Pipe D1 anode is connected with diode D4 negative electrode, and diode D2 anode is connected with diode D3 negative electrode, diode D3's
Anode is connected and is grounded with diode D4 anode, and electrochemical capacitor C10 positive pole is connected with diode D1 negative electrode, electrochemical capacitor
C10 negative pole is connected with diode D3 anode.
A kind of 10. LED constant current power supply according to claim 9, it is characterised in that：The power factor correction circuit also wraps
Diode D5, diode D6, diode D7, diode D8, electric capacity C3, electric capacity C4, electric capacity C6 are included, diode D5 and electric capacity C3 is simultaneously
Connection connection, diode D5 are connected between diode D3 and electrochemical capacitor C10, diode D5 negative electrode and diode D3 anode
Connection, diode D5 anode is connected with the anode of electrochemical capacitor C10 negative electrode and diode D8, diode D6 negative electrode and
Diode D1 anode is connected, and diode D7 negative electrode is connected with diode D2 anode, diode D6 anode and diode
D7 anode is connected and is grounded by electric capacity C6, and diode D6 anode is simultaneously connected with diode D8 negative electrode, diode D4's
Anode is grounded by electric capacity C4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721105978.XU CN207216474U (en) | 2017-08-31 | 2017-08-31 | A kind of current sample change-over circuit and LED constant current power supply |
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| CN201721105978.XU CN207216474U (en) | 2017-08-31 | 2017-08-31 | A kind of current sample change-over circuit and LED constant current power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108966424A (en) * | 2018-08-14 | 2018-12-07 | 湖南品胜生物技术有限公司 | A kind of control method of microscope light source |
| CN109782835A (en) * | 2018-12-27 | 2019-05-21 | 湖南银河电气有限公司 | A kind of wide-range and the DC current source and processing method of closed-loop control |
| CN113376432A (en) * | 2021-06-02 | 2021-09-10 | 安徽辰吉新能源科技有限公司 | Low-cost motor controller current real-time sampling method |
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2017
- 2017-08-31 CN CN201721105978.XU patent/CN207216474U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108966424A (en) * | 2018-08-14 | 2018-12-07 | 湖南品胜生物技术有限公司 | A kind of control method of microscope light source |
| CN109782835A (en) * | 2018-12-27 | 2019-05-21 | 湖南银河电气有限公司 | A kind of wide-range and the DC current source and processing method of closed-loop control |
| CN113376432A (en) * | 2021-06-02 | 2021-09-10 | 安徽辰吉新能源科技有限公司 | Low-cost motor controller current real-time sampling method |
| CN113376432B (en) * | 2021-06-02 | 2022-06-10 | 安徽辰吉新能源科技有限公司 | Low-cost motor controller current real-time sampling method |
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