CN108135048B - A kind of power limitation control driving circuit and driving power - Google Patents
A kind of power limitation control driving circuit and driving power Download PDFInfo
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- CN108135048B CN108135048B CN201711322066.2A CN201711322066A CN108135048B CN 108135048 B CN108135048 B CN 108135048B CN 201711322066 A CN201711322066 A CN 201711322066A CN 108135048 B CN108135048 B CN 108135048B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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Abstract
The present invention relates to a kind of power limitation control driving circuit and driving power, which includes: constant-current control unit, is connect with the negative output terminal of power supply, is sampled to the voltage of negative output terminal and generates current sampling signal；Constant pressure control unit is connect with the positive output end of power supply, is sampled to the voltage of positive output end and generates voltage sampling signal；Power limitation control unit, connect with constant-current control unit and constant pressure control unit respectively, when carrying out invariable power adjusting, difference output constant current adjustment signal and constant pressure adjustment signal；Constant-current control unit exports the primary side working frequency that the first adjustment signal adjusts power supply according to current sampling signal and constant flow regulation signal；Meanwhile constant pressure control unit exports the primary side working frequency that the second adjustment signal adjusts power supply according to voltage sampling signal and constant pressure adjustment signal, realizes the constant power output of power supply.The present invention, which reaches, prevents overload use and fool proof effect, and can widen the working range of power supply.
Description
Technical field
The present invention relates to the technical field of driving power, more specifically to a kind of power limitation control driving circuit and
Driving power.
Background technique
Currently, LED illumination lamp has become daily necessities, LED light source has environmental protection, energy conservation, long service life, driving
The advantages such as voltage is low, it is considered to be 21 century most promising lighting source is particularly suitable for office, classroom, market, parking
, waiting room, subway, tunnel, the public place of the needs such as street lamp illumination for a long time.
In the design of LED power existing scheme, output electric current is controlled usually using constant-current control module, makes LED
Loaded work piece is in constant current state, it is ensured that LED safety.The voltage of this scheme adaptation, current range are narrow, the type quantity of single series
It is especially more.Standby a large amount of stock is needed to be unfavorable for capital turnover to make increased costs if you need to meet customer order amount then.
The current specification as required for the lamps and lanterns of different brands is different, to enable LED power to be compatible with as far as possible
In that can reserve current adjustment on the lamps and lanterns of different size, design, user meets practical application by fine-adjusting current.But it is such to do
Method has a defect, such as export electric current be turned up, and output voltage without accordingly reduce will lead to output overpower using P ↑=U*I ↑.
Once the load lamps and lanterns wrong overpower of user using can directly result in product function failure or cause to damage.
Traditional LED power output is divided to current constant control and Isobarically Control two independent units, in adjustment output constant current size
When, Isobarically Control is unaffected, and because the current specification of client lamps and lanterns is had nothing in common with each other, product in design is intended to that client is facilitated to exist
Using reserved current adjustment is above adjusted, when output electric current tunes up, because voltage is constant, there is overpower application in use
Risk: P ↑=U*I ↑.For example, need to accordingly turn down electric current, but since current constant control and Isobarically Control are two only in constant pressure
Therefore vertical unit can exist when adjusting and adjust wrong risk, overcurrent is caused to use.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of power limitation control
Driving circuit and driving power.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of power limitation control driving circuit, wraps
It includes:
Constant-current control unit is connect with the negative output terminal of power supply, and the voltage of the negative output terminal is sampled and generated
Current sampling signal；
Constant pressure control unit is connect with the positive output end of the power supply, is sampled simultaneously to the voltage of the positive output end
Generate voltage sampling signal；
Power limitation control unit is connect with the constant-current control unit and the constant pressure control unit respectively, for into
When row invariable power is adjusted, output constant current adjustment signal and constant pressure adjustment signal are distinguished to the constant-current control unit and the constant pressure
Control unit；
The constant-current control unit adjusts and believes according to the current sampling signal and constant flow regulation signal output first
Number adjust power supply primary side working frequency, to adjust the output electric current of power supply；Meanwhile the constant pressure control unit is according to
Voltage sampling signal and the constant pressure adjustment signal export the primary side working frequency that the second adjustment signal adjusts power supply, with adjustment
The output voltage of power supply realizes the constant power output of power supply.
Preferably, the power limitation control unit includes:
Unit is adjusted, is adjusted for the power according to load and exports adjusting voltage；
Bleeder circuit is connect with the adjusting unit, is divided to the adjusting voltage, and exports the first partial pressure and the
Two partial pressures；
Comparing unit is connect with the bleeder circuit, is received first partial pressure and the second partial pressure, is based respectively on described the
One partial pressure and the second partial pressure export the constant flow regulation signal and constant pressure adjustment signal, and the constant flow regulation signal is sent to
The constant-current control unit, while the constant pressure adjustment signal is sent to the constant pressure control unit.
Preferably, the comparing unit includes:
Constant current reference circuit is connect with the bleeder circuit, receives first partial pressure, and defeated based on first partial pressure
The constant flow regulation signal is to the constant-current control unit out；
Constant voltage reference circuit is connect with the bleeder circuit, receives second partial pressure, and defeated based on second partial pressure
The constant pressure adjustment signal is to the constant pressure control unit out.
Preferably, the comparing unit includes:
Comparator, the comparator include constant current input terminal, constant pressure input terminal, constant current output end and constant voltage output end；
The constant current input terminal of the comparator is connect with the bleeder circuit, the constant current output end of the comparator with it is described
Constant-current control unit connection receives second partial pressure, and exports the constant flow regulation signal to institute based on second partial pressure
State constant-current control unit；
The constant pressure input terminal of the comparator is connect with the bleeder circuit, the constant voltage output end of the comparator with it is described
Constant pressure control unit connection receives first partial pressure, and exports the constant pressure adjustment signal to institute based on first partial pressure
State constant pressure control unit.
Preferably, the power limitation control unit further include:
Constant current output circuit is connect with the constant-current control unit and the comparing unit respectively, by the constant flow regulation
Signal is transmitted to the constant-current control unit；
Constant voltage outputting circuit is connect with the constant pressure control unit and the comparing unit respectively, by the constant voltage reference
Signal is transmitted to the constant pressure control unit.
Preferably, the adjusting unit includes potentiometer, the first termination reference voltage of the potentiometer, the potentiometer
Second end connect with the bleeder circuit.
Preferably, the bleeder circuit includes the first bleeder circuit and the second bleeder circuit；
First bleeder circuit is connect with the adjusting unit and the comparing unit respectively, for the adjusting electricity
Pressure is divided to generate the first partial pressure, and first partial pressure is sent to the comparing unit；
Second bleeder circuit is connect with the adjusting unit and the comparing unit respectively, for the adjusting electricity
Pressure is divided to generate the second partial pressure, and second partial pressure is sent to the comparing unit.
Preferably, first bleeder circuit includes the 15th resistance and the 17th resistance, the 15th resistance and institute
It states the 17th resistance to be sequentially connected in series between the adjusting unit and reference ground, and the 15th resistance and the 17th electricity
Connecting node between resistance is connect with the comparing unit；
Second bleeder circuit includes the 19th resistance and the 14th resistance, the 19th resistance and the described 14th
Resistance is sequentially connected in series between the adjusting unit and reference ground, and between the 19th resistance and the 14th resistance
Connecting node is connect with the comparing unit.
Preferably, further includes:
Feed circuit is connect with the constant-current control unit and the constant pressure control unit respectively, is received described first and is adjusted
Signal and second adjustment signal are saved, and feedback signal is exported according to first adjustment signal and second adjustment signal
To the primary circuit of the power supply, to adjust the primary side working frequency of the power supply.
The present invention also provides a kind of driving powers, including above-described power limitation control driving circuit.
Implement power limitation control driving circuit of the invention, has the advantages that the present invention passes through setting invariable power
Control unit is believed when needing to carry out invariable power adjusting to power supply by the constant flow regulation that power limitation control unit exports simultaneously
Number and constant pressure adjustment signal, adjust constant-current control unit and constant pressure control unit to the primary side working frequency of power supply simultaneously
Section, realizes the constant power output of power supply, efficiently avoids the risk that overpower uses.In addition, circuit of the present invention it is simple, at
This is low, while can reach prevents overload from using, has also achieved fool proof effect, has widened the working range of single power supply, can
The type quantity of single series is adapted to, more can neatly arrange in pairs or groups lamps and lanterns, reduce the stock amount of client.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the structural schematic diagram of power limitation control driving circuit embodiment one of the present invention；
Fig. 2 is the structural schematic diagram of power limitation control driving circuit embodiment two of the present invention；
Fig. 3 is the circuit diagram of power limitation control driving circuit embodiment one of the present invention；
Fig. 4 is the circuit diagram of power limitation control driving circuit embodiment two of the present invention；
Fig. 5 is the circuit diagram of traditional power limitation control driving circuit.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.
Refering to fig. 1, Fig. 1 is a kind of structural schematic diagram of power limitation control driving circuit embodiment one provided by the invention,
The power limitation control driving circuit of the embodiment can be used in LED drive power.
As shown in Figure 1, the power limitation control driving circuit of the present embodiment may include: constant-current control unit 20, constant pressure control
Unit 30 and power limitation control unit 10 processed.Wherein, constant-current control unit 20 are connect with the negative output terminal of power supply, defeated to bearing
The voltage of outlet is sampled, and current sampling signal is generated；Constant pressure control unit 30 is connect, to just with the positive output end of power supply
The voltage of output end is sampled, and voltage sampling signal is generated；Power limitation control unit 10, respectively with constant-current control unit 20 and
Constant pressure control unit 30 connects, and is used for when carrying out invariable power adjusting, respectively output constant current adjustment signal and constant pressure adjustment signal
To constant-current control unit 20 and constant pressure control unit 30；Constant-current control unit 20 is according to current sampling signal and constant flow regulation signal
The primary side working frequency that the first adjustment signal adjusts power supply is exported, to adjust the output electric current of power supply；Meanwhile Isobarically Control list
Member 30 exports the primary side working frequency that the second adjustment signal adjusts power supply according to voltage sampling signal and constant pressure adjustment signal, with
The output voltage for adjusting power supply, realizes the constant power output of power supply.
Specifically, in the present embodiment, constant-current control unit 20, mainly when needing to carry out invariable power adjusting, according to right
The constant current tune that the sampling current sampling signal obtained and power limitation control unit 10 of the electric current of the output end of power supply provide
Signal is saved, the first adjustment signal is generated, the working frequency of main primary side is adjusted by first adjustment signal, and then adjust electricity
The output electric current in source.
Optionally, the constant-current control unit 20 of the present embodiment may include current sampling circuit 201 and the first comparison circuit
202。
Current sampling circuit 201 is connected between the negative output terminal of power supply and the first comparison circuit 202, for power supply
The electric current of output end sampled, generate corresponding current sampling signal, and generated current sampling signal is sent to
First comparison circuit 202.Optionally, in the present embodiment, current sampling circuit 201 may include at least one resistance, and extremely
Few resistance is sequentially connected in series between the negative output terminal and the first comparison circuit 202 of power supply.
First comparison circuit 202, including the first comparison operation device, the first comparison operation device include negative input end, positive input
End and output end, wherein the positive input terminal of the first comparison operation device is connect with current sampling circuit 201, receives current sample electricity
The current sampling signal that road 201 exports.The negative input end of first comparison operation device also passes through the positive output of current-limiting resistance and power supply
End connection, wherein current-limiting resistance is used to carry out the voltage on power supply positive output end to sample and be transmitted to current limliting sampled signal
On the negative input end of first comparison operation device.Further, the positive input terminal of the first comparison operation device also with power limitation control list
Member 10 connects, for receiving the constant flow regulation signal of the output of power limitation control unit 10.The output end of first comparison operation device is used
In exporting the first adjustment signal.
It is to be appreciated that after constant-current control unit 20 receives the constant flow regulation signal that power limitation control unit 10 is sent,
That is after the positive input terminal of the first comparison operation device receives the constant flow regulation signal of the transmission of power limitation control unit 10, current sample
Signal and constant flow regulation signal load the positive input terminal in the first comparison operation device simultaneously, and the first comparison operation device is by positive input terminal
On voltage be compared with the voltage on negative input end, export the first adjustment signal.
Constant pressure control unit 30, mainly when needing to carry out invariable power adjusting, according to the voltage of the output end to power supply
The constant pressure adjustment signal that voltage sampling signal and power limitation control unit 10 obtained provides is sampled, second is generated and adjusts letter
Number, the working frequency of main primary side is adjusted by second adjustment signal, and then adjust the output electric current of power supply.
Optionally, the constant pressure control unit 30 of the present embodiment may include voltage sampling circuit 301 and the second comparison circuit
302。
Voltage sampling circuit 301 is connected between the positive input terminal of power supply and the second comparison circuit 302, for power supply
The voltage of positive output end sampled, generate corresponding voltage sampling signal, and generated voltage sampling signal is sent
To the second comparison circuit 302.In the present embodiment, voltage sampling circuit 301 may include at least one resistance, and at least one
Resistance is sequentially connected in series in the positive output end of power supply and with reference between ground, wherein between two resistance at least one resistance
Node is connect with the second comparison circuit 302.
Second comparison circuit 302, may include the second comparison operation device, and the second comparison operation device includes negative input end, just
Input terminal and output end, wherein the positive input terminal of the second comparison operation device is connect with the positive input terminal of the first comparison operation device, the
The negative input end of two comparison operation devices is connect with voltage sampling circuit 301, and the negative input end of the second comparison operation device also with perseverance
Power control unit 10 connects.Further, the positive input of the positive input terminal of the second comparison operation device and the first comparison operation device
Resistance is also in series between end, by the concatenated resistance voltage transmission that generates the positive input terminal of the second comparison operation device extremely
The positive input terminal of first comparison operation device.
When carrying out power limitation control, the negative input end of the second comparison operation device receives voltage sampling signal and invariable power control
The constant pressure adjustment signal that unit 10 processed exports, the second comparison operation device will carry out on negative input end with the voltage on positive input terminal
Compare, exports the second adjustment signal.
Alternatively, in the present embodiment, the first comparison circuit 202 and the second comparison circuit 302 can be two independences
Device, also can integrate and use in a chip as an individual device.
Power limitation control unit 10, when carrying out invariable power adjusting, output constant current adjustment signal and constant pressure adjust letter respectively
Number to constant-current control unit 20 and constant pressure control unit 30, while constant-current control unit 20 and constant pressure control unit 30 being made to work,
To realize the purpose of constant power output.
Optionally, in the present embodiment, power limitation control unit 10 may include adjusting unit 101,102 and of bleeder circuit
Comparing unit 103.
Unit 101 is adjusted, output is adjusted for the power according to load and adjusts voltage.Alternatively, the present embodiment
Adjusting unit 101 may include potentiometer, wherein potentiometer first termination reference voltage, the second end of potentiometer with point
Volt circuit 102 connects.Further, potentiometer can be adjustable resistance.It is to be appreciated that by using adjustable resistance, into
When row invariable power is adjusted, the resistance value of adjustable resistance is adjusted, and then change the adjusting voltage for being transmitted to bleeder circuit 102.Wherein, may be used
The selection of resistance is adjusted to be determined according to specific power supply.The present invention is not especially limited.
Bleeder circuit 102 is connect with unit 101 is adjusted, and is divided to voltage is adjusted, and exports the first partial pressure and second
Partial pressure.
Alternatively, the bleeder circuit 102 of the present embodiment may include the first bleeder circuit 1021 and the second bleeder circuit
1022。
First bleeder circuit 1021 is connect with adjusting unit 101 and comparing unit 103 respectively, for carrying out to adjusting voltage
First partial pressure is sent to comparing unit 103 to generate the first partial pressure by partial pressure.
Optionally, the first bleeder circuit 1021 may include multiple resistance.In a specific example, the first bleeder circuit
1021 may include the 15th resistance and the 17th resistance, and the 15th resistance and the 17th resistance, which are sequentially connected in series, is adjusting unit
Between 101 and reference ground, and the connecting node between the 15th resistance and the 17th resistance is connect with comparing unit 103.It can be with
Understand ground, the node voltage between the 15th resistance and the 17th resistance is the first partial pressure.
Second bleeder circuit 1022 is connect with adjusting unit 101 and comparing unit 103 respectively, for carrying out to adjusting voltage
Second partial pressure is sent to comparing unit 103 to generate the second partial pressure by partial pressure.
Second bleeder circuit 1022 includes the 19th resistance and the 14th resistance, and the 19th resistance and the 14th resistance are successively
It is connected on and adjusts between unit 101 and reference ground, and the connecting node between the 19th resistance and the 14th resistance is single compared with
Member 103 connects.
It is to be appreciated that the node voltage between the 19th resistance and the 14th resistance is the second partial pressure.
Comparing unit 103 is connect with bleeder circuit 102, is received the first partial pressure and the second partial pressure, is based respectively on the first partial pressure
Output constant current adjustment signal and constant pressure adjustment signal are divided with second, and constant flow regulation signal is sent to constant-current control unit
20, while constant pressure adjustment signal is sent to constant pressure control unit 30.
Optionally, the comparing unit 103 of the present embodiment may include constant current reference circuit 1031 and constant voltage reference circuit
1032, or may include comparator, i.e., comparing unit 103 can be by constant current reference circuit 1031 and constant voltage reference circuit 1032
Composition, can also be made of a comparator.
Wherein, when comparing unit 103 is made of constant current reference circuit 1031 and constant voltage reference circuit 1032, specific electricity
Road connection relationship are as follows:
Constant current reference circuit 1031 is connect with bleeder circuit 102, receives the first partial pressure, and based on the first partial pressure output constant current
Adjustment signal is to constant-current control unit 20.Wherein, the first bleeder circuit in constant current reference circuit 1031 and bleeder circuit 102
1021 connections are received the first partial pressure that the first bleeder circuit 1021 generates, and are adjusted based on the first partial pressure starting with output constant current
Signal is to constant-current control unit 20.
Constant voltage reference circuit 1032 is connect with bleeder circuit 102, receives the second partial pressure, and permanent based on the second partial pressure output
Press adjustment signal to constant pressure control unit 30.Wherein, the second bleeder circuit in constant voltage reference circuit 1032 and bleeder circuit 102
1022 connections receive the second partial pressure that the second bleeder circuit 1022 generates, and based on the second partial pressure starting to export constant pressure adjusting
Signal is to constant-current control unit 20.
Alternatively, constant current reference circuit 1031 and constant voltage reference circuit 1032 can use a voltage reference chip
It realizes, wherein when needing to carry out invariable power adjusting, just work does not work in the case of other used voltage reference chip.
In a specific example, the voltage reference chip of AV431 can be used.
When comparing unit 103 is made of comparator, specific circuit connecting relation is as follows:
Comparator used by the present embodiment includes that constant current input terminal, constant pressure input terminal, constant current output end and constant pressure are defeated
Outlet；
The constant current input terminal of comparator is connect with bleeder circuit 102, the constant current output end of comparator and constant-current control unit
20 connections receive the second partial pressure, and based on the second partial pressure output constant current adjustment signal to constant-current control unit 20.Specifically, than
It is connect compared with the constant current input terminal of device with the second bleeder circuit 1022 in bleeder circuit 102, receives the second bleeder circuit 1022 and produce
The second raw partial pressure, and based on the second partial pressure output constant current adjustment signal.
The constant pressure input terminal of comparator is connect with bleeder circuit 102, the constant voltage output end of comparator and constant pressure control unit
30 connections receive the first partial pressure, and based on the first partial pressure output constant pressure adjustment signal to constant pressure control unit 30.Specifically, than
It is connect compared with the constant pressure input terminal of device with the first bleeder circuit 1021 in bleeder circuit 102, receives the first bleeder circuit 1021 and produce
The first raw partial pressure, and based on the first partial pressure output constant pressure adjustment signal.
Further, power limitation control unit 10 is stated further include: constant current output circuit 105 and constant voltage outputting circuit 104.
Constant current output circuit 105 is connect with constant-current control unit 20 and comparing unit 103 respectively, by constant flow regulation signal
It is transmitted to constant-current control unit 20.
Optionally, constant current output circuit 105 can be made of diode and resistance, wherein after diode and resistance series connection
It is connected between comparing unit 103 and constant-current control unit 20.Constant voltage outputting circuit 104, respectively with constant pressure control unit 30 and
Comparing unit 103 connects, and constant voltage reference signal is transmitted to constant pressure control unit 30.
In a specific example, if comparing unit 103 is by constant current reference circuit 1031 and 1032 groups of constant voltage reference circuit
Include the 8th diode and the 16th resistance at, constant current output circuit 105, constant voltage outputting circuit 104 include the 7th diode and
Thirteenth resistor.Specific connection are as follows: the anode of the 8th diode is connect with constant-current control unit 20, the cathode of the 8th diode
It is connect with the first end of the 16th resistance, the second end of the 16th resistance is connect with constant current reference circuit 1031；7th diode
Anode connect with constant pressure control unit 30, the first end of the cathode of the 7th diode and thirteenth resistor connects, the 13rd electricity
The second end of resistance is connect with constant voltage reference circuit 1032.
Alternatively, comparing unit 103 is made of comparator in another specific example, constant current output circuit 105 includes the
Eight diodes and the 16th resistance, constant voltage outputting circuit 104 include the 7th diode and thirteenth resistor.At this point, specifically connecting
It is connected in: the 7th pin connection (output end that the 7th pin is comparator) of the anode and comparator of the 8th diode, the
The cathode of eight diodes is connect with one end of the 16th resistance, and the other end of the 16th resistance is connect with constant-current control unit 20；
The first pin connection (another output that the first pin is comparator) of the anode and comparator of 7th diode, the seven or two
The cathode of pole pipe and one end of thirteenth resistor connect, and the other end of thirteenth resistor is connect with constant pressure control unit 30.
As shown in figure 5, Fig. 5 is the circuit diagram of traditional power limitation control driving circuit, as shown in Figure 5, perseverance is being carried out
When power regulation, adjustable resistance VR1 and VR2 need to be adjusted respectively, and in the actual operation process, adjustable resistance VR1 and VR2 are in appearance
Upper identical, this will result in, and in adjustment process, is easy to appear and wrong situation is adjusted to occur, or leakage is adjusted, and fool proof cannot be reached
Effect, moreover, in order to reach invariable power, need to accordingly turn down electric current (i.e. VR2) in constant voltage process, if adjusting be adjust it is wrong,
The case where missing VR1 when VR2 is adjusted, then will lead to overpower use occurs, and can burn out load (such as if continuing use
Lamps and lanterns).
And the present invention is when carrying out invariable power adjusting, it is only necessary to adjust the adjusting unit 101 in power limitation control unit 10
(only one potentiometer) adjusts letter by the adjusting of power limitation control unit 10 while the constant flow regulation signal and constant pressure of output
Number, constant-current control unit 20 and constant pressure control unit 30 is adjusted to the primary side working frequency of power supply simultaneously, realizes
The constant power output of power supply efficiently avoids the risk that overpower uses.Effectively achieved fool proof effect, at the same by pair
The adjusting of potentiometer can widen the working range of single power supply, be suitable for the type quantity of single series, can more neatly
Collocation lamps and lanterns, reduce the stock amount of client.
Referring to Fig.2, Fig. 2 is the structural schematic diagram of power limitation control driving circuit embodiment two of the present invention.The present embodiment
Power limitation control driving circuit on the basis of example 2, further can also include:
Feed circuit 40 is connect with constant-current control unit 20 and constant pressure control unit 30 respectively, receives the first adjustment signal
With the second adjustment signal, and the primary circuit of feedback signal to power supply is exported according to the first adjustment signal and the second adjustment signal,
To adjust the primary side working frequency of power supply.Optionally, the feed circuit 40 of the present embodiment may include optocoupler, anti-by optocoupler
The feedback signal of feedback is to the primary circuit of power supply, and the primary circuit of power supply is based on the feedback signal to the working frequency progress of primary side
Corresponding adjustment, and then the output electric current and output voltage of power output end are adjusted, to realize constant power output.
Refering to Fig. 3, Fig. 3 is the circuit diagram of constant-power control circuit embodiment one of the invention.
In this embodiment, the first comparison circuit 202 and the second comparison circuit 302 are integrated in a chip as one
Individual device uses.Comparing unit 103 includes constant current reference circuit 1031 and constant voltage reference circuit 1032.
As shown in figure 3, the first comparison operation device and the second comparison operation device are integrated in chip U2, wherein first compares
The negative input end of arithmetic unit is the PIN6 pin of chip U2, and the PIN5 that the positive input terminal of the first comparison operation device is chip U2 draws
Foot, the output end of the first comparison operation device are the PIN7 pin of chip U2.The negative input end of second comparison operation device is chip U2
PIN2 pin, the positive input terminal of the second comparison operation device is the PIN3 pin of chip U2, the output end of the second comparison operation device
For the PIN1 pin of chip U2.
Current sampling circuit 201 includes resistance R6 and resistance J1, and feed circuit 40 includes optocoupler U1-B, voltage sampling circuit
301 include resistance R8 and resistance R12, and constant voltage outputting circuit 104 includes the 7th diode D7, thirteenth resistor R13, constant voltage reference
Circuit 1032 includes voltage reference chip U3, and constant current output circuit 105 includes the 8th diode D8, the 16th resistance R16, constant current
Reference circuit 1031 includes voltage reference chip U4.First bleeder circuit 1021 includes the 15th resistance R15 and the 17th resistance
R17, the second bleeder circuit 1022 include the 14th resistance R14 and the 19th resistance R19.Adjusting unit 101 includes adjustable resistance
VR3。
As shown in figure 3, the connection relationship between each circuit of the embodiment is as follows:
The connection of the negative output terminal of the one end resistance J1 and power supply, another termination of resistance J1 is with reference to ground, the first end of resistance R6
It is connect with the other end of resistance J1, and the first end of resistance R6 also connects with reference to ground, the second end of resistance R6 and the first comparison operation
The positive input terminal of device connects, and the negative input end of the first comparison operation device is by passing sequentially through resistance R7 and capacitor CE2 and power supply
The output end of positive output end connection, the first comparison operation device is connect by resistance R2 with a cathode of co-anode diode D1.
The positive input terminal of second comparison operation device is connect with the first end of resistance R10, the second end and resistance R6 of resistance R10
Second end connection, filter circuit is also parallel between the first end and second end of resistance R10, for the second comparison operation
The voltage that the positive input terminal of device generates is filtered, with the stability of holding circuit.Wherein, filter circuit includes resistance R9
RC circuit is formed with after capacitor C5, resistance R9 and capacitor C5 series connection, then is connected in parallel between the first end and second end of resistance R10.
Node voltage between resistance R6 and resistance R10 is current sampling signal, i.e., the current sample that current sampling circuit 201 generates is believed
Node voltage number between resistance R6 and resistance R10.
The negative input end of second comparison operation device is connect with voltage sampling circuit 301, specifically, voltage sampling circuit 301
In the first end of resistance R8 and the positive output end of power supply connect, the second end of resistance R8 is connect by resistance R12 with reference to ground, and electric
Connecting node between resistance R8 and resistance R12 is also connect with the negative input end of the second comparison operation device, resistance R8 and resistance R12 it
Between node voltage be voltage sampling circuit 301 voltage sampling signal.The power supply of chip U2 terminates VCC, the ground connection of chip U2
Termination is with reference to ground.
Connecting node connection between the anode and resistance R8 and resistance R12 of 7th diode D7, the 7th diode D7's
Cathode is connect with the first end of thirteenth resistor R13, the second end of thirteenth resistor R13 and the third end of voltage reference chip U3
Connection, the second termination of voltage reference chip U3 is with reference to ground, and the of the first end of voltage reference chip U3 and the 14th resistance R14
Connecting node connection between 19 resistance R19, the 19th resistance R19 also pass through the 14th resistance R14 and connect with reference to ground.Eight or two
Connecting node connection between the anode and resistance R6 and resistance R10 of pole pipe D8, the cathode of the 8th diode D8 pass through the 16th
Resistance is connect with the third end of voltage reference chip U4, and the second termination of voltage reference chip U4 is with reference to ground, voltage reference chip
Connecting node connection between the first end of U4 and the 17th resistance R17 and the 15th resistance R15, the 15th resistance R15 are also logical
The 17th resistance R17 is crossed to connect with reference to ground.
Adjustable resistance VR3 first termination reference voltage VREF, the second end of adjustable resistance VR3 respectively with the 19th resistance
R19 and the 15th resistance R15 connection.
The concrete operating principle of above-described embodiment is, (if you need to turn down output electric current, accordingly when carrying out invariable power adjusting
Promoted output voltage), then when adjusting by the adjustable side 3 of adjustable resistance VR3 toward lower with increase can high resistance VR3 resistance value, this
When, the first partial pressure and the second partial pressure caused by the first bleeder circuit 1021 and the second bleeder circuit 1022 reduce, i.e. voltage
The voltage of the first end of fiducial chip U3 and voltage reference chip U4 reduces, voltage reference chip U3 and voltage reference chip U4
Work is started simultaneously at, at this point, the drop-down by voltage reference chip U4 acts on, forms the 16th resistance R16 and resistance R6 simultaneously
Join circuit, since the node voltage between the 16th resistance R16 and resistance R6 is provided by the positive input terminal of the second comparison operation device,
The voltage is benchmark voltage, and voltage is constant, the node current of the 16th resistance R16 and resistance R6 become larger, and therefore, first compares
The positive input terminal voltage of arithmetic unit becomes larger, by the first comparison operation device comparison operation handle, the first comparison operation device it is defeated
Outlet exports high level.Meanwhile voltage reference chip U3 also generates drop-down effect to the 7th diode, makes thirteenth resistor R13
Parallel circuit is formed with resistance R12, the negative input end voltage of the second comparison operation device is pulled low, and the second comparison operation device is just
Input terminal voltage is benchmark voltage, therefore, after the comparison operation of the second comparison operation device processing, the second comparison operation device
Output end also exports high level, at this time since two cathode potentials of common anode diode D1 are high electricity it can be seen from circuit
Position, therefore, optocoupler U1-B is not turned on；When optocoupler U1-B is not turned on, primary circuit turns duty ratio down, to reduce primary side electricity
Stream, while increase output voltage, realize constant power output.
Refering to Fig. 4, Fig. 4 is the circuit diagram of power limitation control driving circuit embodiment two of the present invention.The present embodiment with
The difference of Fig. 3 embodiment one is that the comparing unit 103 of the present embodiment is made of comparator, corresponding 105 He of constant current output circuit
Connection in constant voltage outputting circuit 104 is also correspondingly connected with according to the characteristic of comparator.
Specifically, as shown in figure 4, the comparator of the present embodiment is chip U2B, wherein the constant current input terminal of comparator is
The PIN5 pin of chip U2B, the constant pressure input terminal of comparator are the PIN2 pin of chip U2B, and the constant current output end of comparator is
The PIN7 pin of chip U2B, the constant voltage output end of comparator are the PIN1 pin of chip U2B.Wherein, the PIN5 of chip U2B draws
Foot is connect by the 19th resistance R19 with the second end of adjustable resistance VR3, and the PIN5 pin of chip U2B also passes through the 14th electricity
Resistance R14 connects with reference to ground, and the PIN6 pin of chip U2B connect with the cathode of the 8th diode D8, the PIN7 pin of chip U2B and the
The anode of eight diode D8 connects, and the cathode of the 8th diode D8 also passes through the positive input of resistance R16 and the first comparison operation device
End connection (the PIN5 pin of U2A).The PIN3 pin of chip U2B and the connection section of the 19th resistance R19 and the 14th resistance R14
The PIN2 pin of point connection, chip U2B is connect by the 15th resistance R15 with the second end of adjustable resistance VR3, chip U2B's
PIN2 pin also passes through the 17th resistance R17 and connects with reference to ground.
The concrete operating principle of the present embodiment are as follows: when carrying out invariable power adjusting, (if you need to turn down output electric current, accordingly
Promoted output voltage), then when adjusting by the adjustable side 3 of adjustable resistance VR3 toward lower with increase can high resistance VR3 resistance value, this
When, the first partial pressure and the second partial pressure caused by the first bleeder circuit 1021 and the second bleeder circuit 1022 reduce, i.e., and the tenth
Node voltage, the 19th resistance R19 between five resistance R15 and the 17th resistance R17 and the node between the 14th resistance R14
Voltage reduces, and the PIN5 pin voltage decline of chip U2B handles by the comparison operation of chip U2B, passes through its PIN7 pin
High level is exported, which is transmitted to the positive input terminal of the first comparison operation device (i.e. by the 8th diode D8 and resistance R16
The PIN5 pin of chip U2A), the PIN5 pin pressure drop of chip U2A increases, and after calculation process, the PIN7 pin of chip U2A is defeated
High level out.Meanwhile the PIN pin voltage decline of chip U2B, it is handled by the comparison operation of chip U2B, passes through its PIN 1
Pin output end high level, it is defeated which by the 7th diode D7 and resistance R13 is transmitted to bearing for the second comparison operation device
Entering end (i.e. the PIN2 pin of chip U2A), the PIN2 pin voltage of chip U2A declines, after calculation process, chip U2A's
PIN1 pin exports high level.At this time since two cathode potentials of common anode diode D1 are high electricity it can be seen from circuit
Position, therefore, optocoupler U1-B is not turned on；When optocoupler U1-B is not turned on, primary circuit turns duty ratio down, to reduce primary side electricity
Stream, while increase output voltage, realize constant power output.
The present invention also provides a kind of driving powers, including above-described power limitation control driving circuit.
Above embodiments only technical concepts and features to illustrate the invention, its object is to allow person skilled in the art
Scholar can understand the contents of the present invention and implement accordingly, can not limit the scope of the invention.It is all to be wanted with right of the present invention
The equivalent changes and modifications that range is done are sought, should belong to the covering scope of the claims in the present invention.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (9)
1. a kind of power limitation control driving circuit characterized by comprising
Constant-current control unit is connect with the negative output terminal of power supply, is sampled to the electric current of the negative output terminal and generates electric current
Sampled signal；
Constant pressure control unit is connect with the positive output end of the power supply, and the voltage of the positive output end is sampled and generated
Voltage sampling signal；
Power limitation control unit is connect with the constant-current control unit and the constant pressure control unit respectively, for carrying out perseverance
When power regulation, output constant current adjustment signal and constant pressure adjustment signal are distinguished to the constant-current control unit and the Isobarically Control
Unit；
The constant-current control unit exports the first adjustment signal tune according to the current sampling signal and the constant flow regulation signal
The primary side working frequency in economize on electricity source, to adjust the output electric current of power supply；Meanwhile the constant pressure control unit is according to the voltage
Sampled signal and the constant pressure adjustment signal export the primary side working frequency that the second adjustment signal adjusts power supply, to adjust power supply
Output voltage, realize the constant power output of power supply；
The power limitation control unit includes:
Unit is adjusted, is adjusted for the power according to load and exports adjusting voltage；
Bleeder circuit is connect with the adjusting unit, is divided to the adjusting voltage, and exports the first partial pressure and second point
Pressure；
Comparing unit is connect with the bleeder circuit, is received first partial pressure and the second partial pressure, is based respectively on described first point
Pressure and the second partial pressure export the constant flow regulation signal and constant pressure adjustment signal, and the constant flow regulation signal are sent to described
Constant-current control unit, while the constant pressure adjustment signal is sent to the constant pressure control unit.
2. power limitation control driving circuit according to claim 1, which is characterized in that the comparing unit includes:
Constant current reference circuit is connect with the bleeder circuit, receives first partial pressure, and based on the first partial pressure output institute
Constant flow regulation signal is stated to the constant-current control unit；
Constant voltage reference circuit is connect with the bleeder circuit, receives second partial pressure, and based on the second partial pressure output institute
Constant pressure adjustment signal is stated to the constant pressure control unit.
3. power limitation control driving circuit according to claim 1, which is characterized in that the comparing unit includes:
Comparator, the comparator include constant current input terminal, constant pressure input terminal, constant current output end and constant voltage output end；
The constant current input terminal of the comparator is connect with the bleeder circuit, the constant current output end of the comparator and the constant current
Control unit connection receives second partial pressure, and exports the constant flow regulation signal to the perseverance based on second partial pressure
Flow control unit；
The constant pressure input terminal of the comparator is connect with the bleeder circuit, the constant voltage output end of the comparator and the constant pressure
Control unit connection receives first partial pressure, and exports the constant pressure adjustment signal to the perseverance based on first partial pressure
Press control unit.
4. power limitation control driving circuit according to claim 1, which is characterized in that the power limitation control unit also wraps
It includes:
Constant current output circuit is connect with the constant-current control unit and the comparing unit respectively, by the constant flow regulation signal
It is transmitted to the constant-current control unit；
Constant voltage outputting circuit is connect with the constant pressure control unit and the comparing unit respectively, by the constant voltage reference signal
It is transmitted to the constant pressure control unit.
5. power limitation control driving circuit according to claim 1, which is characterized in that the adjusting unit includes current potential
Device, the first termination reference voltage of the potentiometer, the second end of the potentiometer are connect with the bleeder circuit.
6. power limitation control driving circuit according to claim 1, which is characterized in that the bleeder circuit includes first point
Volt circuit and the second bleeder circuit；
First bleeder circuit is connect with the adjusting unit and the comparing unit respectively, for the adjusting voltage into
First partial pressure is sent to the comparing unit to generate the first partial pressure by row partial pressure；
Second bleeder circuit is connect with the adjusting unit and the comparing unit respectively, for the adjusting voltage into
Second partial pressure is sent to the comparing unit to generate the second partial pressure by row partial pressure.
7. power limitation control driving circuit according to claim 6, which is characterized in that first bleeder circuit includes the
15 resistance and the 17th resistance, the 15th resistance and the 17th resistance are sequentially connected in series in the adjusting unit and ginseng
It examines between ground, and the connecting node between the 15th resistance and the 17th resistance is connect with the comparing unit；
Second bleeder circuit includes the 19th resistance and the 14th resistance, the 19th resistance and the 14th resistance
It is sequentially connected in series between the adjusting unit and reference ground, and the connection between the 19th resistance and the 14th resistance
Node is connect with the comparing unit.
8. power limitation control driving circuit according to claim 1, which is characterized in that further include:
Feed circuit is connect with the constant-current control unit and the constant pressure control unit respectively, is received described first and is adjusted letter
Number and second adjustment signal, and feedback signal is exported to institute according to first adjustment signal and second adjustment signal
The primary circuit of power supply is stated, to adjust the primary side working frequency of the power supply.
9. a kind of driving power, which is characterized in that including the described in any item power limitation control driving circuits of claim 1-8.
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| CN201711322066.2A CN108135048B (en) | 2017-12-12 | 2017-12-12 | A kind of power limitation control driving circuit and driving power |
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| CN201711322066.2A CN108135048B (en) | 2017-12-12 | 2017-12-12 | A kind of power limitation control driving circuit and driving power |
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| CN108135048B true CN108135048B (en) | 2019-01-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109149935B (en) * | 2018-09-07 | 2020-10-23 | 深圳市德赛微电子技术有限公司 | Control circuit for freely switching different working modes of switching power supply |
| 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 |
| 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 |
| CN109379811B (en) * | 2018-11-20 | 2020-11-03 | 深圳市崧盛电子股份有限公司 | LED drive circuit with output current self-adjusting capability |
| CN109862661A (en) * | 2019-02-22 | 2019-06-07 | 欧普照明股份有限公司 | A kind of power-supply controller of electric, connection load circuit and lamps and lanterns |
| CN114009152A (en) * | 2019-06-17 | 2022-02-01 | 红色半导体公司 | Power limiting controller |
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| CN103731033A (en) * | 2013-12-19 | 2014-04-16 | 山东艾诺仪器有限公司 | Wide-range DC power supply with constant power output characteristic |
| CN205283405U (en) * | 2015-12-24 | 2016-06-01 | 杭州士兰微电子股份有限公司 | Constant power control circuit and contain actuating system of said constant power control circuit |
| CN106992699A (en) * | 2016-01-21 | 2017-07-28 | 华润矽威科技（上海）有限公司 | A kind of primary side feedback constant-current and constant-voltage control circuit and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103731033A (en) * | 2013-12-19 | 2014-04-16 | 山东艾诺仪器有限公司 | Wide-range DC power supply with constant power output characteristic |
| CN205283405U (en) * | 2015-12-24 | 2016-06-01 | 杭州士兰微电子股份有限公司 | Constant power control circuit and contain actuating system of said constant power control circuit |
| CN106992699A (en) * | 2016-01-21 | 2017-07-28 | 华润矽威科技（上海）有限公司 | A kind of primary side feedback constant-current and constant-voltage control circuit and method |
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