CN206851071U - A kind of power supply constant-power control circuit - Google Patents
A kind of power supply constant-power control circuit Download PDFInfo
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- CN206851071U CN206851071U CN201720048872.4U CN201720048872U CN206851071U CN 206851071 U CN206851071 U CN 206851071U CN 201720048872 U CN201720048872 U CN 201720048872U CN 206851071 U CN206851071 U CN 206851071U
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Abstract
Power supply constant-power control circuit is the utility model is related to, including the voltage sampling circuit being connected between the anode of power output end and negative terminal, the current sampling circuit being connected between the negative terminal of power output end and reference ground, the first comparison circuit being connected with voltage sampling circuit, the second comparison circuit being connected with current sampling circuit, the first servo-actuated circuit being connected between the output end of the first comparison circuit and the input of the second comparison circuit and the second servo-actuated circuit being connected between the input of the first comparison circuit and the output end of the second comparison circuit.By setting the constant-power control circuit in power output end, realize adjust automatically output voltage and output current, make the purpose of power supply output firm power, and power output is unrelated with input voltage, substantially increase the suitable application area of power supply, it is not required to increase extra space-consuming, reliability height, controls the scope of invariable power predeterminable, it is practical.
Description
Technical field
The technical field of driving power is the utility model is related to, more specifically to a kind of power supply power limitation control electricity
Road.
Background technology
In daily life, power supply unit is used in general will be available commercially as AC power (Tathagata
From the alternating current of commercial power socket) dc source is converted into, to be supplied to electrical installation to use.For example, using in PC
In power supply unit switch technology, be to provide the direct current of a variety of predetermined preparations based on the switching manipulation using switching device
Output voltage.This kind of power supply unit is commonly referred to as switching regulator (or switch type) power supply unit.
LED drive power refers to the power supply unit that an extraneous electric energy is converted to secondary electric energy needed for LED.LED drives
The inputing power of dynamic power supply includes alternating current and direct current, and exporting electric energy can generally change and change with LED forward voltages
The constant current of voltage.LED drive power is mainly used in LED illumination, LED display and LED backlight field, and wherein LED shines
It is bright to require highest for Drive Control Technique, it is that most important application field, market prospects are the widest at present for LED drive power
It is wealthy.The stability of driving power quality is the key factor of LED illumination lamp service life.
Because LED lamp industry lacks unified standard, so the string of lamp bead, and number design is all that major producer voluntarily determines
Fixed, this is just created, and the LED lamp module that most producer designs is all different, and this gives the versatility and matching of power supply
Very big challenge is brought, the power supply that often most client uses all is to have different output voltages and output constant current value
It is required that special power source factory brings great inconvenience in production.
Existing constant-power power source technology mainly by artificial one voltage range of setting, then goes what adjustment exported
Current value, then by the artificial power for removing to calculate the voltage exported and being multiplied by electric current and obtaining, determine whether beyond power supply most
Big output power value.
There is following drawback in existing LED drive power technology：
The voltage of output can adapt to automatically within the scope of one, but output current is a constant Constant Electric Current
Source, but the LED lamp bead producer of in the market is a feast for the eyes, the situation that the good and bad jumbled together causes the characteristic of lamp bead to vary, so
Often occur that the adaptability of single LED power is inadequate, cause the irreplaceability of LED drive power, and once whole lamp dress
With the drawbacks of unadjustable occurs afterwards.
It is more existing to be known as the power supply that accomplish invariable power, it is necessary to be programmed using single-chip microcomputer, if the model of invariable power
If enclosing change, it is necessary to which debugging routine again, this is unfamiliar with debugging routine with compiling and being cured to program for most of
It is extremely difficult with unpractical function for the client of power source internal；And single-chip microcomputer is done in high temperature and complex electromagnetic environment
Destabilizing factor in the state of disturbing in itself be present.
The voltage of part type can be adjusted manually with electric current, and this is produced for the higher and higher LED illumination of intelligence degree
It is the design to run in the opposite direction, and product, once on roof or road, regulation is extremely inconvenient for product application.It is another
Individual risk is exactly for unprofessional terminal user, may voluntarily adjust output voltage and current value, it is final there is a possibility that
Power output is more than the maximum of demarcation, ultimately results in the damage of product.
3 kinds of defects of the above or problem, the use limitation being subject to for the application field of product, so as to reduce product
Practicality.
Utility model content
The technical problems to be solved in the utility model is, for the drawbacks described above of prior art, there is provided a kind of power supply is permanent
Power control circuit.
Technical scheme is used by the utility model solves its technical problem：Construct a kind of power supply power limitation control electricity
Road, it is characterised in that including be connected between the anode of power output end and negative terminal voltage sampling circuit, be connected to the electricity
Current sampling circuit between the negative terminal and reference ground of source output terminal, the first comparison being connected with the voltage sampling circuit are electric
Road, the second comparison circuit being connected with the current sampling circuit, the output end for being connected to first comparison circuit and described
First between the input of second comparison circuit is servo-actuated circuit and is connected to input and the institute of first comparison circuit
State the second servo-actuated circuit between the output end of the second comparison circuit；
The voltage sampling circuit be used for gather the power output end output voltage and output voltage sampled signal extremely
First comparison circuit, first comparison circuit export the first error signal to described the according to the voltage sampling signal
One servo-actuated circuit, the described first servo-actuated circuit compare according to first error signal the first follow-up signal of output to described second
Circuit, second comparison circuit export the second feedback signal to adjust the output of the power supply according to first follow-up signal
Electric current；
The current sampling circuit be used for gather the power output end output current and output current sampled signal extremely
Second comparison circuit, second comparison circuit export the second error signal to described the according to the current sampling signal
Two servo-actuated circuits, the described second servo-actuated circuit compare according to second error signal the second follow-up signal of output to described first
Circuit, first comparison circuit export the first feedback signal to adjust the output of the power supply according to second follow-up signal
Voltage.
In power supply constant-power control circuit described in the utility model, it is preferable that also include electric with first comparison
Road connects, for providing the first reference voltage generating circuit of the first reference voltage to first comparison circuit；
First reference voltage generating circuit includes resistance R23 and diode D8, and the first end of the resistance R23 is with carrying
Connected for the external circuit of reference signal, the second end of the resistance R23 is connected with the anode of the diode D8, two pole
Pipe D8 negative electrode is connected with first comparison circuit；
The resistance R23 receives the reference signal that the external circuit provides and generates the first reference voltage through two pole
Pipe D8 is transmitted to first comparison circuit.
In power supply constant-power control circuit described in the utility model, it is preferable that also include electric with second comparison
Road connects, for providing the second reference voltage generating circuit of the second reference voltage to second comparison circuit；
Second reference voltage generating circuit includes resistance R24 and resistance R25, the resistance R24 first end connection
Between the resistance R23 and the diode D8 anode, the second end of the resistance R24 and the first of the resistance R25
End connection, the second end of the resistance R25 connect the reference ground；Node between the resistance R24 and the resistance R25 is also
It is connected to second comparison circuit；
The resistance R24 and resistance R25 carries out partial pressure to the terminal voltage of the resistance R23 and generates the second reference voltage
Transmit to second comparison circuit；Node electricity of second reference voltage between the resistance R24 and the resistance R25
Pressure.
In power supply constant-power control circuit described in the utility model, it is preferable that also include with described first comparing respectively
Connected compared with circuit, second comparison circuit, for the first feedback signal for exporting first comparison circuit and described the
Second feedback signal back of two comparison circuits output is to the primary circuit of the power supply to adjust the output voltage of the power supply
Or the feedback circuit of output current.
In power supply constant-power control circuit described in the utility model, it is preferable that the voltage sampling circuit includes electricity
Resistance R8 and resistance R118, the resistance R8 are connected in parallel on the anode and negative terminal of the power output end after being connected with the resistance R118
Between, the node between the resistance R8 and the resistance R118 is additionally coupled to first comparison circuit；
The resistance R8 and resistance R118 carries out partial pressure, and output voltage to the output voltage of the power output end
Sampled signal is to first comparison circuit；Section of the voltage sampling signal between the resistance R8 and the resistance R118
Point voltage.
In power supply constant-power control circuit described in the utility model, it is preferable that the current sampling circuit includes electricity
Rs is hindered, the first end of the resistance Rs is connected to the reference ground, the second end and the power output end of the resistance Rs
Negative terminal connects.
In power supply constant-power control circuit described in the utility model, it is preferable that first comparison circuit includes electricity
Hinder R19, resistance R20, electric capacity C11 and the first operational amplifier U5, the first end of the resistance R19 and the resistance R8 and institute
State the node connection between resistance R118, the second end of the resistance R19 and the anti-phase input of the first operational amplifier U5
End connection；The resistance R20 be connected in parallel on after being connected with the electric capacity C11 inverting input of the first operational amplifier U5 with
Between output end；The in-phase input end of the first operational amplifier U5 is connected with first reference voltage generating circuit.
In power supply constant-power control circuit described in the utility model, it is preferable that second comparison circuit includes electricity
Hinder R33, electric capacity C7 and the second operational amplifier U5A, the second operational amplifier U5A inverting input and the electricity
Hinder Rs the second end connection, in-phase input end and second reference voltage generating circuit of the second operational amplifier U5A
Connection；The output end of the second operational amplifier U5A is connected with the described second servo-actuated circuit.
In power supply constant-power control circuit described in the utility model, it is preferable that the described first servo-actuated circuit includes electricity
The first end and the external circuit for hindering R20, resistance R1, resistance R12 and the 3rd operational amplifier U5D, the resistance R1 connect
Connect, the second end of the resistance R1 is connected with the inverting input of the 3rd operational amplifier U5D；The of the resistance R20
One end is connected with first comparison circuit, and the second end of the resistance R20 is same mutually defeated with the 3rd operational amplifier U5D's
Enter end connection；The inverting input of the 3rd operational amplifier U5D is also connected to the reference ground by the resistance R12,
The output end of the 3rd operational amplifier U5D is connected with second comparison circuit.
In power supply constant-power control circuit described in the utility model, it is preferable that the described second servo-actuated circuit includes electricity
R3, resistance R4 and four-operational amplifier U5C are hindered, the first end of the resistance R3 is connected with the external circuit, the electricity
Resistance R3 the second end is connected with the inverting input of the four-operational amplifier U5C, and the four-operational amplifier U5C's is anti-
Phase input is also connected to the reference ground by the resistance R4；The in-phase input end of the four-operational amplifier U5C with
The second comparison circuit connection, the output end of the four-operational amplifier U5C are connected to first comparison circuit.
Implement power supply constant-power control circuit of the present utility model, have the advantages that：Power supply of the present utility model
Constant-power control circuit in power output end by setting voltage sampling circuit and current sampling circuit to the defeated of power output end
Go out voltage or output current is sampled, and compared according to the voltage or current signal of sampling by the first comparison circuit or second
Circuit by the voltage sampled or current signal compared with reference voltage output feedback signal into the primary circuit of power supply
And then output voltage or output current are adjusted, the power output of power supply is kept constant purpose so as to reach.In addition, by
Power output end sets the constant-power control circuit, realizes adjust automatically output voltage and output current, makes power supply output permanent
Determine the purpose of power, and power output is unrelated with input voltage, substantially increases the suitable application area of power supply, is not required to increase and additionally accounts for
It is high with space, reliability, control the scope of invariable power predeterminable, it is practical.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing：
Fig. 1 is the logic diagram of the utility model power supply constant-power control circuit；
Fig. 2 is the circuit theory diagrams of the utility model power supply constant-power control circuit.
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, is described in further detail to the utility model.
The problem of existing for prior art, the utility model proposes a kind of power supply constant-power control circuit.The circuit
LED field is can be applied to, such as can be as the constant-power control circuit of LED drive power, load can be the various light fixtures such as LED, such as
The LED lamp modules such as the whole lamps of LED, LED street lamp.The constant-power control circuit is by solving the bad adaptability of power supply, regulation not
It is convenient even to turn on the impaired problem of product.I.e. can be largely using the power supply of the power supply constant-power control circuit
The string of varying number and the LED lamp module of lamp design are matched, as long as the voltage of LED lamp module demand is in the utility model
Constant-power control circuit power supply nominal range in, power supply can automatically match required voltage, and electric current
Maximum can automatically compute, and be restricted, so as to avoid because the artificial mistake that calculates causes power output beyond demarcation
Maximum and the problem of damage product.
As shown in figure 1, in the logic diagram of power supply constant-power control circuit of the present utility model, power supply power limitation control
Circuit compares including current sampling circuit 10, voltage sampling circuit 20, the servo-actuated circuit 40 of the first comparison circuit 30, first, second
Circuit 50, second is servo-actuated circuit 60, the first reference voltage generating circuit 70, the second reference voltage generating circuit 80 and feedback
Circuit 90.Current sampling circuit 10 is connected to the negative terminal (LED-) of power output end between reference ground, voltage sampling circuit 20
It is connected in parallel between the anode (LED+) of power output end and the negative terminal (LED-) of power output end, the input of the first comparison circuit 30
End is connected with voltage sampling circuit 20, the first reference voltage generating circuit 70 respectively, the output end of the first comparison circuit 30 and the
One servo-actuated circuit 40 connects, and the output end of the first comparison circuit 30 is additionally coupled to feedback circuit 90；First servo-actuated circuit 40 connects
Between the output end of the first comparison circuit 30 and the input of the second comparison circuit 50；The input of second comparison circuit 50 is also
It is connected with the second reference voltage generating circuit 80, the output end of the second comparison circuit 50 is servo-actuated circuit 60, feedback with second respectively
Circuit 90 connects；The output end of second servo-actuated circuit 60 is connected to the input of the first comparison circuit 30.
It is to be appreciated that voltage sampling circuit 20 is used for the output voltage for gathering power output end and output voltage sampling letter
Number to the first comparison circuit 30, the first comparison circuit 30 will receive voltage sampling signal and the first reference voltage generating circuit extremely
First reference voltages of 70 generations are compared, and by comparing the first error signal of output, first error signal is transmitted to the
One servo-actuated circuit 40, the reference signal provided by the first servo-actuated circuit 40 according to first error signal with external circuit are compared
Compared with the input of output the first follow-up signal to the second comparison circuit 50, the second feedback signal is exported by the second comparison circuit 50
To feedback circuit 90, by feedback circuit 90 by the primary circuit of the second feedback signal back to power supply, the primary circuit of power supply
It is adjusted according to the second feedback signal, and then the output current of regulation power supply, so as to realize constant power output.
Preferably, in the present embodiment, the first error signal of the first comparison circuit 30 output is also transmitted to feedback circuit
90, first error signal is fed back in the primary circuit of power supply by feedback circuit 90, by the primary circuit of power supply according to first
Error signal is controlled, and then the output voltage of regulation power supply, maintains power output invariable.
Current sampling circuit 10 be used for gather power output end output current and output current sampled signal to second ratio
Compared with circuit 50, the second comparison circuit 50 current sampling signal received and the second reference voltage generating circuit 80 are generated
Two reference voltages are compared, and by comparing the second error signal of output, second error signal is transmitted to the second servo-actuated circuit
60, by the second servo-actuated output second compared with the reference signal that external circuit provides according to second error signal of circuit 60
Follow-up signal exports the first feedback signal to feedback circuit to the input of the first comparison circuit 30 by the first comparison circuit 30
90, by feedback circuit 90 by the primary circuit of the first feedback signal back to power supply, then by the primary circuit of power supply according to
First feedback signal is adjusted, and then the output voltage of regulation power supply, so as to realize constant power output.
Preferably, in the present embodiment, the second error signal of the second comparison circuit 50 output is also transmitted to feedback circuit
90, second error signal is fed back in the primary circuit of power supply by feedback circuit 90, by the primary circuit of power supply according to second
Error signal is controlled, and then the output voltage of regulation power supply, maintains power output invariable.
As shown in Fig. 2 it is the circuit theory diagrams of the utility model power supply constant-power control circuit, specifically：
Current sampling circuit 10 includes resistance Rs, and resistance Rs first end is connected to reference ground, resistance Rs the second end with
Negative terminal (LED-) connection of power output end.It is to be appreciated that current sampling circuit 10 is used for the output for gathering power output end
Electric current,, can by collection of the current sampling circuit 10 to output current when the output current of power output end rises or falls
In real time grasp power output end output current situation of change, and output current sampled signal to follow-up circuit fed back with
The voltage of regulation power supply output end, and then export the purpose of firm power.Preferably, caused by current sampling circuit 10
The end of node voltage, i.e. resistance Rs second end of the current sampling signal between resistance Rs and the negative terminal (LED-) of power output end
Voltage.Current sampling signal caused by current sampling circuit 10 is transmitted to the input of the second comparison circuit 50.
Voltage sampling circuit 20 includes resistance R8 and resistance R118, and it is defeated that resistance R8 is connected in parallel on power supply after being connected with resistance R118
Go out between the anode (LED+) at end and negative terminal (LED-), i.e., the anode of resistance R8 first end and power output end (LED+) connects
Connect, resistance R8 the second end is connected with resistance R118 first end, resistance R118 the second end and the negative terminal of power output end
(LED-) connect.Voltage sampling circuit 20 is used for the output voltage for gathering power output end, when the output voltage of power output end
When rising or falling, by collection of the voltage sampling circuit 20 to output voltage, power output end output voltage can be grasped in real time
Situation of change, and output voltage sampled signal to subsequent conditioning circuit is fed back with the output current of regulation power supply output end, is entered
And reach the purpose of output firm power.Preferably, voltage sampling signal caused by voltage sampling circuit 20 be resistance R8 with
Node voltage between resistance R118, the node voltage are transmitted to the input of the first comparison circuit 30 by resistance R19.
First comparison circuit 30 includes resistance R19, resistance R20, electric capacity C11 and the first operational amplifier U5.Resistance R19
First end and resistance R8 and resistance R118 between node connect, resistance R19 the second end and the first operational amplifier U5's
Inverting input connects；Resistance R20 is connected in parallel on the first operational amplifier U5 inverting input and output after being connected with electric capacity C11
Between end；First operational amplifier U5 in-phase input end is connected with the first reference voltage generating circuit 70.Further, power supply
Constant-power control circuit also includes voltage-regulator diode ZD2, and voltage-regulator diode ZD2 anode is connected to reference ground, voltage-regulator diode
ZD2 negative electrode is connected between resistance R19 and the first operational amplifier U5 inverting input.In the present embodiment, voltage stabilizing two
Pole pipe ZD2 can prevent from damaging the first operational amplifier U5 anti-phase input when the output voltage moment of power output end is too high
End, and then realize effective protection to the first operational amplifier U5.It is to be appreciated that the first operational amplifier U5 anti-phase input
The voltage sampling signal that end is exported by resistance R19 receiving voltages sample circuit 20, and the first base received with in-phase input end
First reference voltage caused by quasi- voltage generation circuit 70 is compared, by the sampled voltage in comparison voltage sampled signal with
First reference voltage produces the first error signal, is exported by the first operational amplifier U5 output end to the first servo-actuated circuit 40.
First servo-actuated circuit 40 includes resistance R20, resistance R1, resistance R12 and the 3rd operational amplifier U5D, resistance R1
First end is connected with external circuit, and resistance R1 the second end is connected with the 3rd operational amplifier U5D inverting input；Resistance
R20 first end and the first comparison circuit 30 (i.e. resistance R20 first end is connected with the first operational amplifier U5 output end)
Connection, resistance R20 the second end is connected with the 3rd operational amplifier U5D in-phase input end；3rd operational amplifier U5D's is anti-
Phase input is also connected to reference ground, the 3rd operational amplifier U5D output end and the second comparison circuit 50 by resistance R12
(i.e. the 3rd operational amplifier U5D output end is connected with the second operational amplifier U5A in-phase input end) connects.Can by Fig. 2
Know, in the present embodiment, the power supply constant-power control circuit also includes diode D12, and diode D12 is connected on the 3rd computing and put
Between big device U5D output end and the second operational amplifier U5A in-phase input end, and diode D12 negative electrode and the 3rd fortune
Amplifier U5D output end connection is calculated, diode D12 anode is connected with the second operational amplifier U5A in-phase input end.It is excellent
Selection of land, in the present embodiment, the first follow-up signal of the first servo-actuated circuit output is sourcing current pattern, and it passes through diode D12
The second operational amplifier U5A in-phase input end is connected to, and then adjusts the electricity on the second operational amplifier U5A in-phase input ends
Pressure, the first feedback signal is exported to feedback circuit 90 by the second operational amplifier U5A effect.Further, the second computing
Second feedback signal of amplifier U5A outputs is low level signal.Preferably, the 3rd operational amplifier U5D in-phase input end
There is provided by the resistance R1 reference voltages received by external circuit, the reference voltage is preferably 2.5V, and the external circuit can be IC
Built-in or outside reference voltage-stablizer, the i.e. reference voltage can lead to built in IC or outside reference voltage-stablizer produces.
Second comparison circuit 50 includes resistance R33, electric capacity C7 and the second operational amplifier U5A.Second operational amplifier
U5A inverting input is connected with resistance Rs the second end, the second operational amplifier U5A in-phase input end and the second benchmark electricity
Pressure generative circuit 80 connects the (node i.e. between the second operational amplifier U5A in-phase input end and resistance R24 and resistance R25
Connection)；Second operational amplifier U5A output end is connected (i.e. the second operational amplifier U5A output with the second servo-actuated circuit 60
End is connected with four-operational amplifier U5C inverting input).
Further, as shown in Fig. 2 in the present embodiment, power supply constant-power control circuit also includes resistance R26, two poles
Pipe D10, diode D11, resistance R21.Resistance R26 first end is connected with the second operational amplifier U5A output end, resistance
R26 the second end is connected with diode D10 negative electrode, and diode D10 anode is connected with feedback circuit 90；The of resistance R21
One end is connected with the first operational amplifier U5 output end, and resistance R21 the second end is connected with diode D11 negative electrode, two poles
Pipe D11 anode is connected between diode D10 anode and feedback circuit 90.It is to be appreciated that when the first servo-actuated circuit 40
It is first servo-actuated by this when exporting the in-phase input end of the first follow-up signal to the second operational amplifier U5A by diode D12
Signal function exports the first feedback letter in the second operational amplifier U5A in-phase input end, and then by the second operational amplifier U5A
Number, transmitted to feedback circuit 90 by resistance R26 and diode D10, fed back to by feedback circuit 90 in the primary circuit of power supply,
It is controlled by primary circuit with the output current of regulation power supply output end, maintains power output invariable so as to reach.When
When first operational amplifier U5 output end exports the first error signal, diode D11 and photoelectrical coupler U2 conductings, first misses
Difference signal is transmitted to the primary circuit of power supply by resistance R21, diode D11 and photoelectrical coupler U2, by primary circuit control
Make and then reduce the output voltage of power output end.Preferably, the first error signal is low level signal.
When the second operational amplifier U5A output end exports the second error signal, diode D10 and photoelectrical coupler U2
Conducting, the second error signal are transmitted to the primary circuit of power supply by resistance R26, diode D10 and photoelectrical coupler U2, by
Primary circuit controls and then reduces the output voltage of power output end.Preferably, the second error signal is low level signal.
Second servo-actuated circuit 60 includes resistance R3, resistance R4 and four-operational amplifier U5C.Resistance R3 first end with
External circuit is connected, and resistance R3 the second end is connected with four-operational amplifier U5C inverting input, four-operational amplifier
U5C inverting input is also connected to reference ground by resistance R4；Four-operational amplifier U5C in-phase input end and the second ratio
(i.e. four-operational amplifier U5C in-phase input end is connected with the second operational amplifier U5A output end) is connected compared with circuit 40,
Four-operational amplifier U5C output end is connected to the first comparison circuit 30.As shown in Figure 2, four-operational amplifier U5C's is defeated
Go out the in-phase input end that end is connected to the first operational amplifier U5 by diode D9, and diode D9 negative electrode and the 4th computing
Amplifier U5C output end connection.Missed it is to be appreciated that the second servo-actuated circuit 60 receives the second of the output of the second comparison circuit 50
Difference signal and output the second follow-up signal to the first operational amplifier U5 in-phase input end act on the first operational amplifier U5
Voltage on in-phase input end, the first feedback signal is exported by the first operational amplifier U5 and passed by resistance R21, diode D11
Feedback circuit 90 is transported to, is fed back to by feedback circuit 90 in the primary circuit of power supply, is controlled by primary circuit to adjust electricity
The output voltage of source output terminal, reach and maintain power output constant.
Preferably, in the present embodiment, the first follow-up signal and the second follow-up signal are sourcing current signal.
In the present embodiment, above-mentioned primary circuit is not shown in the diagram.
First reference voltage generating circuit 70 includes resistance R23 and diode D8, and resistance R23 first end is with providing benchmark
The external circuit connection of signal, resistance R23 the second end are connected with diode D8 anode, diode D8 negative electrode and the first ratio
Connected compared with circuit 30；Resistance R23 receives the reference signal that external circuit provides and generates the first reference voltage through diode D8 transmission
To the first comparison circuit 30.Preferably, the reference signal is voltage signal, and its magnitude of voltage is preferably 2.5V.
Second reference voltage generating circuit 80 includes resistance R24 and resistance R25, and resistance R24 first end is connected to resistance
Between R23 and diode D8 anode, resistance R24 the second end is connected with resistance R25 first end, resistance R25 the second end
Connect reference ground；Node between resistance R24 and resistance R25 is additionally coupled to the second comparison circuit 50；Resistance R24 and resistance R25
Resistance R23 terminal voltage progress partial pressure the second reference voltage of generation is transmitted to the second comparison circuit；Preferably, in the present embodiment
In, node voltage of second reference voltage between resistance R24 and resistance R25.
Feedback circuit 90 includes photoelectrical coupler U2, and photoelectrical coupler U2 is connected to diode D10 anode and power supply
Between primary circuit (primary circuit is not shown).By feedback circuit 90 by the first error signal, the second error signal, first anti-
Feedback signal or the second feedback signal back are controlled defeated with regulation power supply to the primary circuit of power supply by the primary circuit of power supply
Go out the output current or output voltage at end, be finally reached the purpose of output firm power.
The principle of power supply constant-power control circuit of the present utility model is described in further detail below：
As shown in Fig. 2 when the output voltage of power output end rises, by voltage sampling circuit 20, i.e. resistance R18 and
Resistance R118 proportion dividers, produce voltage sampling signal and feed back to the first operational amplifier U5 reverse input end, the first fortune
The in-phase input end for calculating amplifier U5 receives the first reference voltage caused by the first reference voltage generating circuit 70, the first fortune simultaneously
Amplifier U5 is calculated by by the first reference voltage of the voltage in the voltage sampling signal on inverting input and in-phase input end
It is compared, so as to produce low level first error signal and be exported from the first operational amplifier U5 output end, now two
Pole pipe D11 is turned on, and photoelectrical coupler U2 turns on the primary circuit that the first error signal is transferred to power supply, is adjusted by primary circuit
Reduce output voltage；The first error signal is also connected to the 3rd operational amplifier U5D input in the same direction simultaneously, and with the 3rd
The reference signal (magnitude of voltage 2.5V) that operational amplifier U5D inverting input is received is compared, and output first is servo-actuated
Signal, first follow-up signal are low level sourcing current signal, and now diode D12 is turned on, and the is connected to by diode D12
Two operational amplifier U5A in-phase input end, the voltage on the second operational amplifier U5A in-phase input ends is dragged down, now second
Operational amplifier U5A exports the second feedback signal, and second feedback signal is low level signal, and the low level signal passes through resistance
R26, diode D10 transmit the primary circuit for feeding back to power supply by photoelectrical coupler U2 to photoelectrical coupler U2, pass through primary electrical
Road is controlled adjustment, reduces the output current of power output end, maintains the constant of power output.When power output end
When output voltage reduces, its operation principle is identical when rising with output voltage, will not be repeated here.
When output current rises, by current sampling circuit 10, i.e. resistance Rs sample and output current sampling letter
Number feed back to the second operational amplifier U5A reverse input end, the second operational amplifier U5A in-phase input end receives the simultaneously
Second reference voltage caused by two reference voltage generating circuits 80, the second operational amplifier U5A pass through on inverting input
Voltage in current sampling signal misses compared with the second reference voltage of in-phase input end so as to produce low level second
Difference signal is simultaneously exported from the second operational amplifier U5A output end, and now diode D10 is turned on, and photoelectrical coupler U2 conductings will
Second error signal is transferred to the primary circuit of power supply, reduces output voltage by primary circuit regulation；First error letter simultaneously
Number be also connected to the second servo-actuated circuit 60, i.e. four-operational amplifier U5C in-phase input end, and with four-operational amplifier
The reference signal (magnitude of voltage 2.5V) that U5C inverting input receives is compared, and exports the second follow-up signal, this second with
Dynamic signal is low level sourcing current signal, and now diode D9 is turned on, and the first operational amplifier U5 is connected to by diode D9
In-phase input end, drag down the voltage on the first operational amplifier U5 in-phase input ends, now the first operational amplifier U5 export
First feedback signal, first feedback signal are low level signal, and the low level signal is transmitted by resistance R21, diode D11
To photoelectrical coupler U2, the primary circuit of power supply is fed back to by photoelectrical coupler U2, adjustment is controlled by primary circuit, dropped
The low output voltage of power output end, maintains the constant of power output.When the output current of power output end reduces, its
Operation principle is identical when rising with output current, will not be repeated here.
The pure mould that power supply constant-power control circuit of the present utility model forms by using related devices such as operational amplifiers
Intend circuit, the output voltage of adjust automatically power output end and the purpose of output current can be achieved, by operational amplifier not
Same computing, it is constant to realize power output, and power output is unrelated with input voltage, is greatly improved the suitable application area of power supply.
In addition, the function that constant-power control circuit of the present utility model is realized all is built in inside driving power, it is not necessary to weight
New LAYOUT PCB, do not increase additional space occupancy, be not required to increase extra wiring and control node, using the control of devices at full hardware
Mode, reliability is high, and the invariable power scope controlled can be pre-set.It can also save labour turnover simultaneously, avoid artificial tune
Section causes the problem of error.
For above example only to illustrate technical concepts and features of the present utility model, its object is to allow be familiar with technique
Personage can understand content of the present utility model and implement accordingly, the scope of protection of the utility model can not be limited.It is all with
The equivalent changes and modifications that the utility model claims scope is done, all should belong to the utility model claims covers model
Enclose.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of the appended claims for the utility model.
Claims (10)
1. a kind of power supply constant-power control circuit, it is characterised in that including being connected between the anode of power output end and negative terminal
Voltage sampling circuit, be connected to the power output end negative terminal and reference ground between current sampling circuit, with the electricity
Pressure sample circuit connection the first comparison circuit, be connected with the current sampling circuit the second comparison circuit, be connected to described in
First between the input of the output end of first comparison circuit and second comparison circuit is servo-actuated circuit and is connected to institute
State the second servo-actuated circuit between the input of the first comparison circuit and the output end of second comparison circuit；
The voltage sampling circuit is used for the output voltage for gathering the power output end and output voltage sampled signal is to described
First comparison circuit, first comparison circuit according to the voltage sampling signal export the first error signal to described first with
Dynamic circuit, the described first servo-actuated circuit are electric to second comparison according to first error signal the first follow-up signal of output
Road, second comparison circuit export the second feedback signal to adjust the output of power supply electricity according to first follow-up signal
Stream；
The current sampling circuit is used for the output current for gathering the power output end and output current sampled signal is to described
Second comparison circuit, second comparison circuit according to the current sampling signal export the second error signal to described second with
Dynamic circuit, the described second servo-actuated circuit are electric to first comparison according to second error signal the second follow-up signal of output
Road, first comparison circuit export the first feedback signal to adjust the output of power supply electricity according to second follow-up signal
Pressure.
2. power supply constant-power control circuit according to claim 1, it is characterised in that also include electric with first comparison
Road connects, for providing the first reference voltage generating circuit of the first reference voltage to first comparison circuit；
First reference voltage generating circuit includes resistance R23 and diode D8, the resistance R23 first end with providing base
The external circuit connection of calibration signal, the second end of the resistance R23 are connected with the anode of the diode D8, the diode D8
Negative electrode be connected with first comparison circuit；
The resistance R23 receives the reference signal that the external circuit provides and generates the first reference voltage through the diode D8
Transmit to first comparison circuit.
3. power supply constant-power control circuit according to claim 2, it is characterised in that also include electric with second comparison
Road connects, for providing the second reference voltage generating circuit of the second reference voltage to second comparison circuit；
Second reference voltage generating circuit includes resistance R24 and resistance R25, the first end of the resistance R24 are connected to institute
Between the anode for stating resistance R23 and the diode D8, the second end of the resistance R24 and the first end of the resistance R25 connect
Connect, the second end of the resistance R25 connects the reference ground；Node between the resistance R24 and the resistance R25 is also connected with
To second comparison circuit；
The resistance R24 and resistance R25 carries out partial pressure to the terminal voltage of the resistance R23 and generates the transmission of the second reference voltage
To second comparison circuit；Node voltage of second reference voltage between the resistance R24 and the resistance R25.
4. the power supply constant-power control circuit according to any one of claims 1 to 3, it is characterised in that also include respectively with
First comparison circuit, second comparison circuit connection, for the first feedback letter for exporting first comparison circuit
Number and second comparison circuit output the second feedback signal back to the primary circuit of the power supply to adjust the power supply
Output voltage or output current feedback circuit.
5. power supply constant-power control circuit according to claim 2, it is characterised in that the voltage sampling circuit includes electricity
Resistance R8 and resistance R118, the resistance R8 are connected in parallel on the anode and negative terminal of the power output end after being connected with the resistance R118
Between, the node between the resistance R8 and the resistance R118 is additionally coupled to first comparison circuit；
The resistance R8 and resistance R118 carries out partial pressure to the output voltage of the power output end, and output voltage samples
Signal is to first comparison circuit；Node electricity of the voltage sampling signal between the resistance R8 and the resistance R118
Pressure.
6. power supply constant-power control circuit according to claim 3, it is characterised in that the current sampling circuit includes electricity
Rs is hindered, the first end of the resistance Rs is connected to the reference ground, the second end and the power output end of the resistance Rs
Negative terminal connects.
7. power supply constant-power control circuit according to claim 5, it is characterised in that first comparison circuit includes electricity
Hinder R19, resistance R20, electric capacity C11 and the first operational amplifier U5, the first end of the resistance R19 and the resistance R8 and institute
State the node connection between resistance R118, the second end of the resistance R19 and the anti-phase input of the first operational amplifier U5
End connection；The resistance R20 be connected in parallel on after being connected with the electric capacity C11 inverting input of the first operational amplifier U5 with
Between output end；The in-phase input end of the first operational amplifier U5 is connected with first reference voltage generating circuit.
8. power supply constant-power control circuit according to claim 6, it is characterised in that second comparison circuit includes electricity
Hinder R33, electric capacity C7 and the second operational amplifier U5A, the second operational amplifier U5A inverting input and the electricity
Hinder Rs the second end connection, in-phase input end and second reference voltage generating circuit of the second operational amplifier U5A
Connection；The output end of the second operational amplifier U5A is connected with the described second servo-actuated circuit.
9. power supply constant-power control circuit according to claim 2, it is characterised in that the described first servo-actuated circuit includes electricity
The first end and the external circuit for hindering R20, resistance R1, resistance R12 and the 3rd operational amplifier U5D, the resistance R1 connect
Connect, the second end of the resistance R1 is connected with the inverting input of the 3rd operational amplifier U5D；The of the resistance R20
One end is connected with first comparison circuit, and the second end of the resistance R20 is same mutually defeated with the 3rd operational amplifier U5D's
Enter end connection；The inverting input of the 3rd operational amplifier U5D is also connected to the reference ground by the resistance R12,
The output end of the 3rd operational amplifier U5D is connected with second comparison circuit.
10. power supply constant-power control circuit according to claim 2, it is characterised in that the described second servo-actuated circuit includes
Resistance R3, resistance R4 and four-operational amplifier U5C, the first end of the resistance R3 is connected with the external circuit, described
Resistance R3 the second end is connected with the inverting input of the four-operational amplifier U5C, the four-operational amplifier U5C's
Inverting input is also connected to the reference ground by the resistance R4；The in-phase input end of the four-operational amplifier U5C
It is connected with second comparison circuit, the output end of the four-operational amplifier U5C is connected to first comparison circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720048872.4U CN206851071U (en) | 2017-01-16 | 2017-01-16 | A kind of power supply constant-power control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720048872.4U CN206851071U (en) | 2017-01-16 | 2017-01-16 | A kind of power supply constant-power control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206851071U true CN206851071U (en) | 2018-01-05 |
Family
ID=60790054
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| CN201720048872.4U Active CN206851071U (en) | 2017-01-16 | 2017-01-16 | A kind of power supply constant-power control circuit |
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| CN109413798A (en) * | 2018-10-23 | 2019-03-01 | 深圳市崧盛电子股份有限公司 | A kind of power supply constant-power control circuit |
| CN110165870A (en) * | 2018-02-14 | 2019-08-23 | 明纬(广州)电子有限公司 | A kind of constant power control circuit |
| CN110867825A (en) * | 2019-10-30 | 2020-03-06 | 许继电源有限公司 | Overvoltage protection circuit of constant power output power supply |
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| CN110165870A (en) * | 2018-02-14 | 2019-08-23 | 明纬(广州)电子有限公司 | A kind of constant power control circuit |
| CN110165870B (en) * | 2018-02-14 | 2021-02-26 | 明纬(广州)电子有限公司 | Constant power control circuit |
| CN109168216A (en) * | 2018-09-13 | 2019-01-08 | 深圳市崧盛电子股份有限公司 | Constant-power LED drive circuit and LED drive power |
| CN109168216B (en) * | 2018-09-13 | 2023-10-27 | 深圳市崧盛电子股份有限公司 | Constant-power LED driving circuit and LED driving power supply |
| CN109413798A (en) * | 2018-10-23 | 2019-03-01 | 深圳市崧盛电子股份有限公司 | A kind of power supply constant-power control circuit |
| CN109413798B (en) * | 2018-10-23 | 2023-12-08 | 深圳市崧盛电子股份有限公司 | Constant power control circuit of power supply |
| CN110867825A (en) * | 2019-10-30 | 2020-03-06 | 许继电源有限公司 | Overvoltage protection circuit of constant power output power supply |
| CN111404356A (en) * | 2020-03-23 | 2020-07-10 | 科华恒盛股份有限公司 | Power supply equipment power grade correction method and corresponding correction device |
| CN111404356B (en) * | 2020-03-23 | 2021-08-10 | 科华恒盛股份有限公司 | Power supply equipment power grade correction method and corresponding correction device |
| CN112752374A (en) * | 2021-01-29 | 2021-05-04 | 广东东菱电源科技有限公司 | Potentiometer type constant power circuit, driving power supply and power supply constant power adjusting method |
| CN112752374B (en) * | 2021-01-29 | 2024-04-09 | 广东东菱电源科技有限公司 | Potentiometer type constant power circuit, driving power supply and power supply constant power regulating method |
| CN114153258A (en) * | 2021-11-26 | 2022-03-08 | 中国电子科技集团公司第四十三研究所 | Power supply closed-loop feedback control circuit and control method |
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