CN106604441B - A kind of the flow measurement circuit and method of LED drive power - Google Patents
A kind of the flow measurement circuit and method of LED drive power Download PDFInfo
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- CN106604441B CN106604441B CN201510672833.7A CN201510672833A CN106604441B CN 106604441 B CN106604441 B CN 106604441B CN 201510672833 A CN201510672833 A CN 201510672833A CN 106604441 B CN106604441 B CN 106604441B
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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]
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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
- H05B45/395—Linear regulators
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Abstract
The invention proposes the flow measurement circuits and method of a kind of LED drive power, the flow measurement circuit includes current-limiting resistance, current sensing resistance, comparator, logic circuit, driving circuit and load, it further include control circuit and configuration resistance, current-limiting resistance one end and current sensing resistance one end are connect with input power, the current-limiting resistance other end connects the 4th input terminal of one input terminal of comparator and control circuit simultaneously, the current sensing resistance other end connects another input terminal of comparator and load outputs simultaneously, comparator output terminal is connect by logic circuit with the second input terminal of control circuit, load input terminal is connect with driving circuit output end, control circuit first input end input control voltage signal, control circuit third input terminal is connect with configuration resistance one end, control circuit output end is connect with driving circuit input terminal.Accurate flow measurement feedback function may be implemented in the flow measurement circuit, applied to different load applications, and improves the versatility of flow measurement circuit, reduces costs.
Description
Technical field
The present invention relates to LED drive power technical fields, more particularly to a kind of flow measurement circuit of novel LED drive power
And method.
Background technique
LED drive power refers to that (such as high pressure industrial frequency AC i.e. alternating current, low-voltage high-frequency exchange such as electronics become by power supply supply
The output etc. of depressor) be converted to specific voltage and current to drive LED illumination device or device to shine the power adapter of work,
In other words, power supply is supplied to the specified function be converted to by devices such as transformers suitable for lighting apparatus or device work
Rate.In order to guarantee the safe handling of LED drive power, generally configure control circuit in LED drive power, control circuit according to
Corresponding flow measurement feedback result controls LED drive power.Applied to traditional flow measurement circuit of above-mentioned LED drive power, knot
Structure schematic diagram is as shown in Figure 1, the circuit includes current-limiting resistance R1, current sensing resistance R2, constant-current source, comparator, logic circuit, control
Circuit, driving circuit and load, wherein current-limiting resistance R1One end and input power VinConnection, current-limiting resistance R1The other end
The input terminal (such as non-inverting input terminal) and constant-current source of comparator, current sensing resistance R are connected simultaneously2One end and input power
VinConnection, current sensing resistance R2The other end simultaneously connect comparator another input terminal (such as inverting input terminal) and load
Output end, the output end of comparator and the input terminal of logic circuit connect, the output end of logic circuit and the input of control circuit
End connection, the output end of control circuit and the input terminal of driving circuit connect, the input terminal of load and the output end of driving circuit
Connection.As shown in Figure 1, the flow measurement circuit of traditional LED drive power, on the one hand uses constant-current source, constant-current source means constant pressure,
The two complements each other and can mutually convert, but the constant current for utilizing different model different components (such as triode) to constitute
Source, even same model identity unit, is being made due to the difference (such as base voltage is an on-fixed value) of its parameter
Also there is certain individual difference in technique, therefore under different operating currents, voltage has certain fluctuation, therefore uncomfortable
Accurate constant current demand is closed, and it is possible thereby to learns that the use of constant-current source causes circuit to may not apply to different loads and answers
With；On the other hand traditional LED drive power flow measurement circuit is typically only capable to be suitable for a certain driving application, corresponding voltage model
Enclose, the applicabilities index such as dimming scope it is very narrow, be unfavorable for the versatility of flow measurement circuit, and reduce and design and develop cost
Evolution of objective.
Summary of the invention
The present invention for the flow measurement circuit of existing LED drive power leads to that different loads cannot be applied using constant-current source
Range, and existing flow measurement circuitry specifications are single, poor universality, therefore the problem of lead to design iterations higher cost, it proposes
A kind of flow measurement circuit of novel LED drive power, the circuit is by configuring the conjunction of the control circuit of resistance and multi input
Reason configuration realizes that flow measurement circuit is applied to different load applications, and improve while realizing accurate flow measurement feedback function
The versatility of flow measurement circuit, reduces design cycle and cost.The invention further relates to a kind of flow measurement sides of LED drive power
Method.
Technical scheme is as follows:
A kind of flow measurement circuit of LED drive power, including current-limiting resistance, current sensing resistance, comparator, logic circuit, driving
One end of circuit and load, the current-limiting resistance is connect with input power, and the one of the other end of current-limiting resistance and the comparator
Input terminal connection, one end of the current sensing resistance are connect with input power, and the other end of current sensing resistance connects the comparison simultaneously
The input terminal of another input terminal of device and the output end of the load, the output end of the comparator and the logic circuit connects
It connects, the input terminal of the load is connect with the output end of the driving circuit, which is characterized in that further include control circuit and configuration
Resistance, the control circuit at least have there are four input terminal and an output end, and the first input end of the control circuit inputs
Voltage signal is controlled, the second input terminal of the control circuit is connect with the output end of the logic circuit, the control circuit
Third input terminal connect with one end of the configuration resistance, the 4th input terminal of the control circuit and the current-limiting resistance
Other end connection, the output end of the control circuit are connect with the input terminal of the driving circuit, described to configure the another of resistance
End ground connection.
The control circuit also has the 5th input terminal, the 5th input terminal input dimmer voltage letter of the control circuit
Number.
Control voltage range in the control voltage signal is 0-10V.
Dimmer voltage range in the dimmer voltage signal is 0-10V.
It is 1V that the configuration resistance value, which keeps its partial pressure,.
It is 200mV that the current-limiting resistance value, which keeps its partial pressure,.
The logic circuit is a phase inverter.
A kind of flow measurement method of LED drive power, which is characterized in that first by the detection electric current of LED drive power and reference
Electric current is respectively converted into input comparator after detection voltage and reference voltage, and comparator will test voltage and reference voltage is compared
Relatively after output level and by logic circuit processing after be input to control circuit；Again by control circuit according to comparator output level
Height judge LED drive power current status, and there is configuration electricity to control circuit input control voltage signal and access
The branch of resistance, control circuit is according to reference voltage and obtained LED drive power current status and combines control voltage signal
It generates and adjusts current drive signal, again by driving circuit after the control circuit output adjustment current drive signal to driving circuit
Driving load.
Dimmer voltage signal also is being inputted to control circuit, control circuit drives according to reference voltage and obtained LED
Source current state simultaneously combines control voltage signal and dimmer voltage signal to generate adjustment current drive signal.
It is 0-10V to the control voltage range in control circuit input control voltage signal, inputs in dimmer voltage signal
Dimmer voltage range be 0-10V, access the configuration resistance value that uses in the branch with configuration resistance keep its partial pressure for
1V。
Technical effect of the invention is as follows:
The invention proposes a kind of flow measurement circuit of LED drive power, including current-limiting resistance, current sensing resistance, comparator, patrol
Circuit, driving circuit and load are collected, further includes control circuit and configuration resistance, wherein one end of current-limiting resistance and input power
Connection, the other end of current-limiting resistance connect an input terminal of comparator and the 4th input terminal of control circuit, flow measurement electricity simultaneously
One end of resistance is connect with input power, the other end of current sensing resistance connect simultaneously comparator another input terminal and load it is defeated
The input terminal of outlet, the output end of comparator and logic circuit connects, and the second of the output end of logic circuit and control circuit is defeated
Enter end connection, the input terminal of load and the output end of driving circuit connect, the input terminal of driving circuit and the output of control circuit
End connection, the first input end input control voltage signal of control circuit, third input terminal and the configuration resistance of control circuit
One end connection configures the other end ground connection of resistance.The circuit does not use constant-current source to provide constant voltage, avoids constant-current source
The parameter as caused by different model different components is different, and then leads to voltage fluctuation, and precision is unstable, and may not apply to
The problem of different loads require, each component in the flow measurement circuit of LED drive power of the present invention have specific connection and phase interworking
Work is closed, by choosing configuration resistance and cooperating the control circuit of multi input, monitors LED drive power also with comparator
For electric current to realize accurate flow measurement feedback function, control circuit judges LED drive power electricity according to the height of comparator output level
Stream mode, reference voltage, LED drive power current status and the control voltage that control circuit is obtained by itself each input terminal
Signal generates adjustment current drive signal, loads so that driving circuit drives；Furthermore the control for being adapted to different application is combined
The dimmer voltage range of voltage processed and the luminous demand of different LED illuminations, realizing flow measurement circuit can be applied to different loads
Using while, improve the reliability and versatility of flow measurement circuit, and avoid different application demand design iterations exploitation
The problem of, reduce design cycle and cost.
The invention further relates to a kind of flow measurement methods of LED drive power, the flow measurement circuit phase with LED drive power of the present invention
It is corresponding, first the detection electric current and reference current of LED drive power are respectively converted into successively defeated after detecting voltage and reference voltage
Enter comparator, logic circuit and control circuit, judged LED drive power current status by control circuit and control circuit is inputted
Controlling voltage signal and access has the branch of configuration resistance, and each road input data is referred to control circuit based on the received
Adjustment current drive signal is ultimately generated with processing, and is input to driving circuit to drive load, realizes LED drive power
Accurate flow measurement, and realize the flow measurement method applied to different load applications.
Detailed description of the invention
Fig. 1 is the flow measurement electrical block diagram of traditional LED drive power.
Fig. 2 is the flow measurement electrical block diagram of LED drive power of the invention.
Specific embodiment
The present invention will be described with reference to the accompanying drawing.
The present invention relates to a kind of flow measurement circuit of LED drive power, electrical block diagram is as shown in Fig. 2, include limit
Leakage resistance R1, current sensing resistance R2, comparator, logic circuit, driving circuit and load, further include control circuit and configuration resistance R3,
There are five input terminal and an output ends for the control circuit tool of the embodiment, wherein current-limiting resistance R1One end and input power
VinConnection, current-limiting resistance R1The other end connect the input terminal (such as non-inverting input terminal) and control circuit of comparator simultaneously
The 4th input terminal, current sensing resistance R2One end and input power VinConnection, current sensing resistance R2The other end simultaneously connect compare
Another input terminal (such as inverting input terminal) of device and the output end of load, the input of the output end and logic circuit of comparator
Second input terminal of end connection, the output end of logic circuit and control circuit connects, the input terminal of load and driving circuit it is defeated
Outlet connection, the input terminal of driving circuit and the output end of control circuit connect, the first input end input control of control circuit
Voltage signal (or perhaps connection control voltage Vc), the 5th input terminal input dimmer voltage signal of control circuit is (in other words
It is connection dimmer voltage Vd), the third input terminal access of control circuit has configuration resistance R3Branch, specially control circuit
Third input terminal and configuration resistance R3One end connection, configure resistance R3The other end ground connection.The circuit does not use constant-current source
To provide constant voltage, but by choosing configuration resistance R3And the control circuit of cooperation multi input, also with comparator
LED drive power electric current is monitored to realize accurate flow measurement feedback function；Furthermore the control electricity for being adapted to different application is combined
Press VcThe dimmer voltage V for the demand that shines with different loads, that is, LED illuminationdRange, realizing the flow measurement circuit can be applied to difference
Load, that is, LED requirement, and improve the versatility of flow measurement circuit, reduce design cycle and cost.
Preferably, the control voltage V in above-mentioned control voltage signalcMay range from 0-10V；In dimmer voltage signal
Dimmer voltage VdMay range from 0-10V；Configure resistance R3Value can be chosen for keeping its partial pressure be 1V；Current limliting electricity
Hinder R1Value can be chosen for keeping its partial pressure be 200mV；In addition, logic circuit can be a phase inverter, or one
A or multiple phase inverters, the combinational logic circuit with door or door and/or other suchlike logic gates.
The working principle of the flow measurement circuit of LED drive power of the present invention is described as follows:
When LED drive power works normally, LED drive power flow measurement circuit passes through current-limiting resistance R as shown in Figure 21
With current sensing resistance R2Reference current and detection electric current are converted into voltage by electric current, specifically, passing through current-limiting resistance R1It will be with reference to electricity
Circulation is changed to reference voltage (alternatively referred to as limit voltage), thus current-limiting resistance R1It is referred to as reference resistance, passes through survey
Leakage resistance R2It will test the flow measurement voltage (alternatively referred to as detection voltage) of electric current conversion, and then more above-mentioned two by comparator
Voltage value (i.e. reference voltage and flow measurement voltage) size is judged to detect whether electric current (that is, flow measurement voltage) is higher than reference
Electric current (that is, limit voltage) detects electric current whether within the scope of reasonable safety value that is, for reference current.
As shown in Fig. 2, for example, two input terminals of comparator: current sensing resistance R2The non-inverting input terminal (being identified generally as "+" end) of connection
And current-limiting resistance R1The inverting input terminal (being identified generally as "-" end) of connection, when non-inverting input terminal input voltage > inverting input terminal
When input voltage, comparator exports high level；When non-inverting input terminal input voltage < inverting input terminal input voltage, comparator
Export low level.LED drive power current status at this time, i.e. detection electric current can be judged according to the height of comparator output level
Whether (that is, flow measurement voltage) is higher than reference current (that is, limit voltage), i.e., for reference current, inspection
Electric current is surveyed whether within the scope of reasonable safety value.The output level of comparator is inputted after being arranged using logic circuit in turn
To control circuit, the LED that the reference voltage and the second input terminal that control circuit is obtained according to the 4th input terminal obtain drives electricity
Ource electric current state simultaneously combines the control voltage signal of first input end and the dimmer voltage signal of the 5th input terminal to generate adjustment electricity
Flow driving signal, that is to say, that the data point reuse (increasing or decreasing driving current) that control circuit is obtained according to each input terminal
Control driving circuit is to drive load.As shown in Fig. 2, LED drive power flow measurement circuit proposed by the present invention does not use constant-current source
To provide constant current voltage, but by configuring resistance R3And the control circuit of cooperation realizes stable constant current voltage, for example, matching
Set resistance R3Value can be chosen for keeping its partial pressure be 1V；Current-limiting resistance R1Value can be chosen for keeping its partial pressure be
200mV；The constant current voltage can be according to the different customized settings of reference current demand.
In addition, when different LED drive power work or LED drive power work in different illumination light-emitting demand occasions
When, the flow measurement circuit of LED drive power proposed by the present invention can meet different flow measurements by the control circuit of its multi input
Feedback request.For example, controlling voltage V when driving the LED illumination luminaire or device of different modelcRange can be
It is adjusted within the scope of 0-10V；When LED illumination luminaire or device work are in different illumination light-emitting demand occasions, light modulation is electric
Press VdRange can be adjusted within the scope of 0-10V；Above-mentioned voltage value range can be customized according to different application demands
Setting.
The invention further relates to a kind of flow measurement method of LED drive power, the flow measurement of this method and LED drive power of the present invention
Circuit is corresponding, it is understood that be the method for realizing the flow measurement circuit of LED drive power of the present invention, this method is first by LED
The detection electric current and reference current of driving power are respectively converted into input comparator after detection voltage and reference voltage, and comparator will
Detection voltage and reference voltage be compared rear output level and by logic circuit processing after be input to control circuit (use
The control circuit is arranged multichannel and inputs and at least export all the way)；Sentenced again by control circuit according to the height of comparator output level
Disconnected LED drive power current status, and there is the branch of configuration resistance to control circuit input control voltage signal and access,
Control circuit is according to reference voltage and obtained LED drive power current status and control voltage signal is combined to generate adjustment electricity
Driving signal is flowed, control circuit exports the adjustment current drive signal to driving circuit, then is driven and loaded by driving circuit.
Preferably, dimmer voltage signal also is being inputted to control circuit, at this point, control circuit is according to reference voltage and obtains
The LED drive power current status and combination control voltage signal and dimmer voltage signal arrived generates adjustment current drive signal.
It is 0-10V to the control voltage range in control circuit input control voltage signal, inputs the light modulation electricity in dimmer voltage signal
Pressure range is 0-10V, accesses the configuration resistance value used in the branch with configuration resistance and keeps its partial pressure for 1V.
The flow measurement method of LED drive power of the present invention turns respectively by the detection electric current and reference current of LED drive power
Comparator, logic circuit and control circuit, control circuit root are sequentially input again under the premise of being changed to detection voltage and reference voltage
It is referred to according to received each road input data and processing ultimately generates adjustment current drive signal, and be input to driving electricity
The accurate flow measurement of LED drive power is realized to drive load in road, and realizes the flow measurement method and answer applied to different loads
With.
It should be pointed out that specific embodiment described above can make those skilled in the art that the present invention be more fully understood
It creates, but do not limit the invention in any way is created.Therefore, although this specification creates the present invention referring to drawings and examples
It makes and has been carried out detailed description, it will be understood by those skilled in the art, however, that still can modify to the invention
Or equivalent replacement, in short, the technical solution and its improvement of all spirit and scope for not departing from the invention, should all contain
It covers in the protection scope of the invention patent.
Claims (10)
1. a kind of flow measurement circuit of LED drive power, including current-limiting resistance, current sensing resistance, comparator, logic circuit, driving electricity
One end of road and load, the current-limiting resistance is connect with input power, and the one of the other end of current-limiting resistance and the comparator is defeated
Enter end connection, one end of the current sensing resistance is connect with input power, and the other end of current sensing resistance connects the comparator simultaneously
Another input terminal and the load output end, the input terminal of the output end of the comparator and the logic circuit connects
It connects, the input terminal of the load is connect with the output end of the driving circuit, which is characterized in that further include control circuit and configuration
Resistance, the control circuit at least have there are four input terminal and an output end, and the first input end of the control circuit inputs
Voltage signal is controlled, the second input terminal of the control circuit is connect with the output end of the logic circuit, the control circuit
Third input terminal connect with one end of the configuration resistance, the 4th input terminal of the control circuit and the current-limiting resistance
Other end connection, the output end of the control circuit are connect with the input terminal of the driving circuit, described to configure the another of resistance
End ground connection.
2. the flow measurement circuit of LED drive power according to claim 1, which is characterized in that the control circuit also has
5th input terminal of the 5th input terminal, the control circuit inputs dimmer voltage signal.
3. the flow measurement circuit of LED drive power according to claim 1 or 2, which is characterized in that the control voltage signal
In control voltage range be 0-10V.
4. the flow measurement circuit of LED drive power according to claim 2, which is characterized in that in the dimmer voltage signal
Dimmer voltage range be 0-10V.
5. the flow measurement circuit of LED drive power according to claim 1 or 2, which is characterized in that the configuration resistance value
Keeping its partial pressure is 1V.
6. the flow measurement circuit of LED drive power according to claim 1 or 2, which is characterized in that the current-limiting resistance value
Keeping its partial pressure is 200mV.
7. the flow measurement circuit of LED drive power according to claim 1 or 2, which is characterized in that the logic circuit is one
Phase inverter.
8. a kind of flow measurement method of LED drive power, which is characterized in that first by the detection electric current of LED drive power and with reference to electricity
Stream is respectively converted into input comparator after detection voltage and reference voltage, and comparator will test voltage and reference voltage is compared
Afterwards output level and by logic circuit handle after be input to control circuit；Again by control circuit according to comparator output level
Height judges LED drive power current status, and has configuration resistance to control circuit input control voltage signal and access
Branch to provide constant voltage, control circuit is according to reference voltage and obtained LED drive power current status and combines
It controls voltage signal and generates adjustment current drive signal, after control circuit exports the adjustment current drive signal to driving circuit
It is driven and is loaded by driving circuit again.
9. the flow measurement method of LED drive power according to claim 8, which is characterized in that also inputted to control circuit
Dimmer voltage signal, control circuit is according to reference voltage and obtained LED drive power current status and combines control voltage
Signal and dimmer voltage signal generate adjustment current drive signal.
10. the flow measurement method of LED drive power according to claim 9, which is characterized in that control circuit input control
Control voltage range in voltage signal is 0-10V, and the dimmer voltage range inputted in dimmer voltage signal is 0-10V, access
The configuration resistance value used in branch with configuration resistance keeps its partial pressure for 1V.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510672833.7A CN106604441B (en) | 2015-10-16 | 2015-10-16 | A kind of the flow measurement circuit and method of LED drive power |
| PCT/CN2016/102287 WO2017063608A1 (en) | 2015-10-16 | 2016-10-17 | Current measurement circuit and method for led drive power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510672833.7A CN106604441B (en) | 2015-10-16 | 2015-10-16 | A kind of the flow measurement circuit and method of LED drive power |
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| CN106604441A CN106604441A (en) | 2017-04-26 |
| CN106604441B true CN106604441B (en) | 2019-08-09 |
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| CN201510672833.7A Active CN106604441B (en) | 2015-10-16 | 2015-10-16 | A kind of the flow measurement circuit and method of LED drive power |
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| WO (1) | WO2017063608A1 (en) |
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| CN110007249A (en) * | 2019-03-19 | 2019-07-12 | 江苏理工学院 | A kind of LED light driving power test method, apparatus and system |
| CN110333878B (en) * | 2019-07-25 | 2023-04-18 | 上海闻泰信息技术有限公司 | Equipment to be brushed, connector and brushing system |
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| CN101707829A (en) * | 2009-05-21 | 2010-05-12 | 海洋王照明科技股份有限公司 | Lamp control circuit |
| CN204231712U (en) * | 2014-11-21 | 2015-03-25 | 上海莱托思电子科技有限公司 | A kind ofly utilize the linear constant current driver circuit for LED of the step-down of charge-discharge principle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7276861B1 (en) * | 2004-09-21 | 2007-10-02 | Exclara, Inc. | System and method for driving LED |
| TWI479780B (en) * | 2010-12-13 | 2015-04-01 | Hon Hai Prec Ind Co Ltd | Synchronous buck converter |
| US20120326618A1 (en) * | 2011-06-24 | 2012-12-27 | National Semiconductor Corporation | Harmonic ripple-current light emitting diode (led) driver circuitry and method |
| CN103052200B (en) * | 2011-10-13 | 2016-04-20 | 欧司朗股份有限公司 | Lighting Control Assembly and control method thereof |
| CN103687160A (en) * | 2012-09-25 | 2014-03-26 | 伟训科技股份有限公司 | A universal dimming control device of a LED driver |
| CN103945594B (en) * | 2013-01-22 | 2016-04-13 | 上海鸣志自动控制设备有限公司 | Improve the circuit of series half-bridge resonance light modulation flicker problem |
| CN103687128A (en) * | 2013-11-28 | 2014-03-26 | 成都市宏山科技有限公司 | LED driving circuit with stable driving function |
| CN204681625U (en) * | 2015-04-20 | 2015-09-30 | 成都岷创科技有限公司 | Input feedforward LED drive circuit |
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2015
- 2015-10-16 CN CN201510672833.7A patent/CN106604441B/en active Active
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- 2016-10-17 WO PCT/CN2016/102287 patent/WO2017063608A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707829A (en) * | 2009-05-21 | 2010-05-12 | 海洋王照明科技股份有限公司 | Lamp control circuit |
| CN204231712U (en) * | 2014-11-21 | 2015-03-25 | 上海莱托思电子科技有限公司 | A kind ofly utilize the linear constant current driver circuit for LED of the step-down of charge-discharge principle |
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| Publication number | Publication date |
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| CN106604441A (en) | 2017-04-26 |
| WO2017063608A1 (en) | 2017-04-20 |
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