CN208985025U - A kind of constant-current circuit under variation voltage - Google Patents
A kind of constant-current circuit under variation voltage Download PDFInfo
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- CN208985025U CN208985025U CN201821443924.9U CN201821443924U CN208985025U CN 208985025 U CN208985025 U CN 208985025U CN 201821443924 U CN201821443924 U CN 201821443924U CN 208985025 U CN208985025 U CN 208985025U
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Abstract
The utility model relates to the constant-current circuits under a kind of variation voltage, including luminescence unit, clamp circuit and constant-current circuit；Luminescence unit one end connects power supply, the input terminal of luminescence unit other end connection constant-current circuit, the control terminal of constant-current circuit and the first end of clamp circuit connect together provides the external circuit of control signal, and the output end of constant-current circuit and the second end of clamp circuit are grounded together；Clamp circuit is used to, by the voltage clamping of constant-current circuit in clamp voltage, constant-current circuit be made to be in constant current state when constant-current circuit is according to control signal conduction.The utility model can make the electric current for flowing through load be in constant current state, avoid loading the variation with input voltage and changing, promote usage experience when input voltage is variation voltage.
Description
Technical field
The utility model relates to field of electronic devices, more specifically to the constant-current circuit under a kind of variation voltage.
Background technique
Existing battery-powered products or input power are the product of the power supply of voltage change, such as LED light, by
In this kind of product be directly supplied by input power it is electrically driven (operated), and due to the output voltage of input power or battery be variation,
Resulting in load in turn can exist when supply voltage variation, and load can change with the variation of supply voltage, influence user
Experience.
For example, LED light, input power is battery, and the output voltage of battery is variation, thus leads to LED light
Brightness can change as cell voltage changes, and influence user experience.
Utility model content
The technical problem to be solved by the present invention is in view of the above drawbacks of the prior art, provide a kind of variation electricity
The constant-current circuit of pressure.
The technical scheme adopted by the utility model to solve the technical problem is as follows: constructing a kind of Constant Electric Current changed under voltage
Road, including luminescence unit, clamp circuit and constant-current circuit；
Described luminescence unit one end connects power supply, and the luminescence unit other end connects the input of the constant-current circuit
End, the control terminal of the constant-current circuit connect together with the first end of the clamp circuit and provide the external circuit of control signal,
The second end of the output end of the constant-current circuit and the clamp circuit is grounded together；
The clamp circuit is used for when the constant-current circuit is according to the control signal conduction, by the constant-current circuit
Voltage clamping makes the constant-current circuit be in constant current state in clamp voltage.
Preferably, the clamp circuit includes zener diode；
The cathode of the zener diode connects the control terminal of the constant-current circuit as the first end of the clamp circuit,
The anode of the zener diode is grounded as the second end of the clamp circuit.
Preferably, the constant-current circuit includes triode Q1 and resistance R0；
The base stage of the triode Q1 connects the external circuit and the clamper as the control terminal of the constant-current circuit
The collector of the first end of circuit, the triode Q1 connects the luminescence unit, institute as the input terminal of the constant-current circuit
The emitter for stating triode Q1 connects the first end of the resistance R0, and the second end of the resistance R0 is as the constant-current circuit
Output end ground connection.
Preferably, the constant-current circuit includes triode Q1 and multiple concatenated first constant current resistances；
The pole of the triode Q1 connects the external circuit and clamper electricity as the control terminal of the constant-current circuit
The collector of the first end on road, the triode Q1 connects the luminescence unit as the input terminal of the constant-current circuit, described
The emitter of triode Q1 passes sequentially through the multiple concatenated first constant current resistance ground connection.
Preferably, the constant-current circuit includes the second constant current resistance of triode Q1 and multiple parallel connections；
After the second constant current resistance composition parallel resistance group of the multiple parallel connection, parallel resistance group one end connects three pole
The emitter of pipe Q1, the other end are grounded as the output end of the constant-current circuit；Make the pole of triode Q1 described in the triode
The first end of the external circuit and the clamp circuit, the collection of the triode Q1 are connected for the control terminal of the constant-current circuit
Electrode connects the luminescence unit as the input terminal of the constant-current circuit.
Preferably, the constant-current circuit includes the triode and third constant current resistance of multiple parallel connections；
The base stage of the triode of the multiple parallel connection be successively shorted after as the constant-current circuit control terminal connection described in
The first end of external circuit and the clamp circuit, the collector of the triode of the multiple parallel connection are used as described after being successively shorted
The input terminal of constant-current circuit connects the luminescence unit, and the emitter of the triode of the multiple parallel connection connects institute after being successively shorted
The first end of third constant current resistance is stated, the second end of the third constant current resistance is grounded as the output end of the constant-current circuit.
Preferably, the constant-current circuit include multiple parallel connections triode and multiple concatenated 4th constant current resistances；
The base stage of the triode of the multiple parallel connection be successively shorted after as the constant-current circuit control terminal connection described in
The first end of external circuit and the clamp circuit, the collector of the triode of the multiple parallel connection are used as described after being successively shorted
The input terminal of constant-current circuit connects the luminescence unit, the emitter of the triode of the multiple parallel connection be successively shorted after again successively
It is grounded by the multiple concatenated 4th constant current resistance.
Preferably, the constant-current circuit includes the triode of multiple parallel connections and the 5th constant current resistance of multiple parallel connections；
The base stage of the triode of the multiple parallel connection be successively shorted after as the constant-current circuit control terminal connection described in
The first end of external circuit and the clamp circuit, the collector of the triode of the multiple parallel connection are used as described after being successively shorted
The input terminal of constant-current circuit connects the luminescence unit；
After the 5th constant current resistance composition parallel resistance group of the multiple parallel connection, one end connects three poles of the multiple parallel connection
The emitter of pipe, other end ground connection.
Preferably, when the constant-current circuit is in constant current state, the triode Q1 work is in amplification region.
Preferably, the luminescence unit includes at least one LED light.
Implement the constant-current circuit under a kind of variation voltage of the utility model, has the advantages that the variation voltage
Under constant-current circuit include luminescence unit, clamp circuit and constant-current circuit；Luminescence unit one end connects power supply, luminescence unit
The other end connects the input terminal of constant-current circuit, and the control terminal of constant-current circuit and the first end of clamp circuit connect together provides control
The external circuit of signal, the output end of constant-current circuit and the second end of clamp circuit are grounded together；Clamp circuit is used in constant current
When circuit is according to control signal conduction, by the voltage clamping of constant-current circuit in clamp voltage, constant-current circuit is made to be in constant current state.
The utility model input voltage be variation voltage when, the electric current for flowing through load can be made be in constant current state, avoid load with
The variation of input voltage and change, promoted usage experience.
Detailed description of the invention
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing:
Fig. 1 is the circuit diagram of the constant-current circuit first embodiment under the utility model variation voltage；
Fig. 2 is the circuit diagram of the constant-current circuit second embodiment under the utility model variation voltage；
Fig. 3 is the circuit diagram of the constant-current circuit 3rd embodiment under the utility model variation voltage；
Fig. 4 is the circuit diagram of the constant-current circuit fourth embodiment under the utility model variation voltage；
Fig. 5 is the circuit diagram of the 5th embodiment of constant-current circuit under the utility model variation voltage；
Fig. 6 is the circuit diagram of the constant-current circuit sixth embodiment under the utility model variation voltage.
Specific embodiment
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing carries out
It is described in detail.
It is the circuit diagram of the constant-current circuit first embodiment under a kind of variation voltage of the utility model with reference to Fig. 1.
In this embodiment, by be arranged clamp circuit, can so as to constant-current circuit conducting when in clamp circuit
Clamp voltage, and constant current state is kept, and then keep the electric current for flowing through luminescence unit invariable, avoid luminescence unit from following power supply
The voltage change of power supply output and the problem of change, ensure that the consistency of luminescence unit brightness.It will of course be understood that ground,
In some other embodiment, luminescence unit may be other power devices, such as heating wire, when luminescence unit is heating wire,
It is equally possible that making the constant current hold for flowing through heating wire, keep constant the calorific value of heating wire, e.g., for setting
There is the thermal cloth of heating wire, by keeping constant the calorific value of heating wire, thermal cloth can be made to can be at temperature constant state, is promoted
The comfort level of thermal cloth.
As shown in Figure 1, the constant-current circuit under the variation voltage includes luminescence unit 10, clamp circuit 30 and constant-current circuit
20.10 one end of luminescence unit connects power supply (VDD), and 10 other end of luminescence unit connects the input terminal of constant-current circuit 20, permanent
The control terminal of current circuit 20 connect together with the first end of clamp circuit 30 and provides the external circuit of control signal (Vtrl), constant current
The output end of circuit 20 and the second end of clamp circuit 30 are grounded together；Clamp circuit 30 is used in constant-current circuit 20 according to control
When signal (Vtrl) is connected, by the voltage clamping of constant-current circuit 20 in clamp voltage, constant-current circuit 20 is made to be in constant current state.Its
In, control signal (Vtrl) is voltage signal, can be provided, can also be provided by battery by external controller, such as MCU.
Optionally, in the embodiment, clamp circuit 30 includes zener diode D1.The cathode of zener diode D1 is as pincers
Position circuit 30 first end connection constant-current circuit 20 control terminal, the anode of zener diode D1 as clamp circuit 30 second
End ground connection.
The constant-current circuit 20 includes triode Q1 and resistance R0.
First end of the base stage of triode Q1 as control terminal the connection external circuit and clamp circuit 30 of constant-current circuit 20,
The collector of triode Q1 connects luminescence unit 10 as the input terminal of constant-current circuit 20, and the emitter of triode Q1 connects resistance
The second end of the first end of R0, resistance R0 is grounded as the output end of constant-current circuit 20.It will of course be understood that ground, as resistance R0
Constant Electric Current flow valuve when increasing, can be in parallel using multiple triodes, wherein triode in parallel is identical triode, be
NPN type triode.
What needs to be explained here is that the pressure stabilizing value of zener diode D1D1 can constant current voltage according to resistance R0 and three poles
The PN junction voltage of pipe Q1 determines.The utility model is not especially limited.
Further, when the constant-current circuit 20 is in constant current state, i.e., when triode Q1 is connected, triode Q1 work
In amplification region.Triode Q1 is NPN type triode.
Power supply (VDD) can be battery, and wherein the type of battery is not construed as limiting.Luminescence unit 10 can be LED light,
Wherein it is possible to include at least one LED light, such as LED light string.
It is illustrated with principle of the Fig. 1 to the constant-current circuit under the variation voltage of the utility model.
Assuming that the pressure stabilizing value of zener diode D1 is V1, the base stage of triode Q1, a transmitting extremely PN junction, PN junction electricity
Pressure be it is fixed, general 0.7V or so (certainly, the PN junction voltage of different types of NPN type triode is different, so, be not limited to
0.7V), luminescence unit 10 includes LED1.And triode Q1 work in amplification region, so, at this time the voltage at the both ends resistance R0=
V1-0.7, it is possible thereby to determine that the voltages keep constant of resistance R0 is constant, since the voltages keep constant at the both ends resistance R0 is constant,
So the electric current for flowing through resistance R0 also keep constant it is constant, according to the characteristic of triode Q1, flow through triode Q1 collector,
The electric current of emitter is essentially identical, so, flow through LED1 electric current also keep constant it is constant.Solve the brightness of LED1 with
The variation for the voltage that power supply (VDD) provides and the problem of change.
With reference to Fig. 2, for a kind of circuit diagram for changing the constant-current circuit second embodiment under voltage provided by the utility model.
The constant current principle of the embodiment is the same as example 1, and difference is that resistance R0 can be using multiple concatenated first
Constant current resistance R1 substitution.
Specifically, as shown in Fig. 2, the constant-current circuit 20 of the embodiment includes triode Q1 and multiple concatenated first constant currents
Resistance R1.
First end of the pole of triode Q1 as control terminal the connection external circuit and clamp circuit 30 of constant-current circuit 20, three
The collector of pole pipe Q1 connects luminescence unit 10 as the input terminal of constant-current circuit 20, and the emitter of triode Q1 passes sequentially through more
A concatenated first constant current resistance R1 ground connection.Wherein, the quantity and resistance value of concatenated first constant current resistance R1 can be according to final
The voltage value of constant current is needed to determine.
With reference to Fig. 3, for a kind of circuit diagram for changing the constant-current circuit 3rd embodiment under voltage provided by the utility model.
Similarly, the constant current principle of the embodiment is the same as example 1, difference be resistance R0 can using it is multiple simultaneously
The second constant current resistance R2 substitution of connection.
Specifically, as shown in figure 3, the constant-current circuit 20 includes the second constant current resistance R2 of triode Q1 and multiple parallel connections.
After the second constant current resistance R2 composition parallel resistance group of multiple parallel connections, parallel resistance group one end connecting triode Q1's
Emitter, the other end are grounded as the output end of constant-current circuit 20；The pole of triode Q1 connects as the control terminal of constant-current circuit 20
The first end of external circuit and clamp circuit 30 is connect, the collector of triode Q1 shines as the input terminal connection of constant-current circuit 20
Unit 10.
Here, the quantity and resistance value of the second constant current resistance R2 in parallel can be according to finally needing the voltage value of constant current true
It is fixed.
With reference to Fig. 4, for a kind of circuit diagram for changing the constant-current circuit fourth embodiment under voltage provided by the utility model.
Similarly, the constant current principle of the embodiment is the same as example 1, difference be triode Q1 can with it is multiple simultaneously
The triode Q2 of connection is substituted.
Specifically, as shown in figure 4, the constant-current circuit 20 includes the triode and third constant current resistance R3 of multiple parallel connections.
The base stage of the triode Q2 of multiple parallel connections be successively shorted after as constant-current circuit 20 control terminal connect external circuit
With the first end of clamp circuit 30, input as constant-current circuit 20 after the collector of the triode Q2 of multiple parallel connections is successively shorted
End connection luminescence unit 10, the emitter of the triode Q2 of multiple parallel connections connect the first of third constant current resistance R3 after being successively shorted
The second end at end, third constant current resistance R3 is grounded as the output end of constant-current circuit 20.
With reference to Fig. 5, for a kind of circuit diagram for changing the 5th embodiment of constant-current circuit under voltage provided by the utility model.
Similarly, the constant current principle of the embodiment is the same as example 1, difference be triode Q1 can with it is multiple simultaneously
The triode Q3 of connection is substituted, and resistance R0 can be using multiple concatenated 4th constant current resistance R4 substitutions.
Specifically, as shown in figure 5, triode Q3 and multiple concatenated fourth perseverance of the constant-current circuit 20 including multiple parallel connections
Leakage resistance R4.
The base stage of the triode Q3 of multiple parallel connections be successively shorted after as constant-current circuit 20 control terminal connect external circuit
With the first end of clamp circuit 30, input as constant-current circuit 20 after the collector of the triode Q3 of multiple parallel connections is successively shorted
End connection luminescence unit 10, the emitter of the triode Q3 of multiple parallel connections pass sequentially through multiple concatenated four again after being successively shorted
Constant current resistance R4 ground connection.
With reference to Fig. 6, for a kind of circuit diagram for changing the constant-current circuit sixth embodiment under voltage provided by the utility model.
Similarly, the constant current principle of the embodiment is the same as example 1, difference be triode Q1 can with it is multiple simultaneously
The triode Q4 of connection is substituted, and resistance R0 can be substituted using the 5th constant current resistance R5 of multiple parallel connections.
Specifically, as shown in fig. 6, the constant-current circuit 20 includes the triode Q4 of multiple parallel connections and the 5th perseverance of multiple parallel connections
Leakage resistance R5.
The base stage of the triode Q4 of multiple parallel connections be successively shorted after as constant-current circuit control terminal connection external circuit and
The first end of clamp circuit 30, input terminal as constant-current circuit 20 after the collector of the triode Q4 of multiple parallel connections is successively shorted
Connect luminescence unit 10；
After the 5th constant current resistance R5 composition parallel resistance group of multiple parallel connections, one end connects the triode Q4's of multiple parallel connections
Emitter, other end ground connection.
What needs to be explained here is that when the triode Q2 of the utility model embodiment, triode Q3, triode Q4 are connected,
It works in amplification region.
Above embodiments are only to illustrate the technical ideas and features of the present invention, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and implement accordingly, the protection scope of the utility model can not be limited.It is all with
The equivalent changes and modifications that the utility model claims range is done, should belong to the utility model claims covers model
It encloses.
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 all should belong to the protection scope of the appended claims for the utility model.
Claims (10)
1. the constant-current circuit under a kind of variation voltage, which is characterized in that including luminescence unit, clamp circuit and constant-current circuit；
Described luminescence unit one end connects power supply, and the luminescence unit other end connects the input terminal of the constant-current circuit,
The control terminal of the constant-current circuit connect together with the first end of the clamp circuit and provides the external circuit of control signal, described
The second end of the output end of constant-current circuit and the clamp circuit is grounded together；
The clamp circuit is used for when the constant-current circuit is according to the control signal conduction, by the voltage of the constant-current circuit
Clamper makes the constant-current circuit be in constant current state in clamp voltage.
2. the constant-current circuit under variation voltage according to claim 1, which is characterized in that the clamp circuit includes pressure stabilizing
Diode；
The cathode of the zener diode connects the control terminal of the constant-current circuit as the first end of the clamp circuit, described
The anode of zener diode is grounded as the second end of the clamp circuit.
3. the constant-current circuit under variation voltage according to claim 1, which is characterized in that the constant-current circuit includes three poles
Pipe Q1 and resistance R0；
The base stage of the triode Q1 connects the external circuit and the clamp circuit as the control terminal of the constant-current circuit
First end, the collector of the triode Q1 connects the luminescence unit as the input terminal of the constant-current circuit, described three
The emitter of pole pipe Q1 connects the first end of the resistance R0, output of the second end of the resistance R0 as the constant-current circuit
End ground connection.
4. the constant-current circuit under variation voltage according to claim 1, which is characterized in that the constant-current circuit includes three poles
Pipe Q1 and multiple concatenated first constant current resistances；
The pole of the triode Q1 connects the external circuit and the clamp circuit as the control terminal of the constant-current circuit
The collector of first end, the triode Q1 connects the luminescence unit, three pole as the input terminal of the constant-current circuit
The emitter of pipe Q1 passes sequentially through the multiple concatenated first constant current resistance ground connection.
5. the constant-current circuit under variation voltage according to claim 1, which is characterized in that the constant-current circuit includes three poles
The second constant current resistance of pipe Q1 and multiple parallel connections；
After the second constant current resistance composition parallel resistance group of the multiple parallel connection, parallel resistance group one end connects the triode Q1
Emitter, the other end as the constant-current circuit output end be grounded；The pole of the triode Q1 is as the constant-current circuit
Control terminal connect the first end of the external circuit and the clamp circuit, the collector of the triode Q1 is as the perseverance
The input terminal of current circuit connects the luminescence unit.
6. the constant-current circuit under variation voltage according to claim 1, which is characterized in that the constant-current circuit includes multiple
Triode and third constant current resistance in parallel；
The base stage of the triode of the multiple parallel connection as the control terminal of the constant-current circuit connects the outside after being successively shorted
The first end of circuit and the clamp circuit, the collector of the triode of the multiple parallel connection are used as the constant current after being successively shorted
The input terminal of circuit connects the luminescence unit, and the emitter of the triode of the multiple parallel connection connects described the after being successively shorted
The second end of the first end of three constant current resistances, the third constant current resistance is grounded as the output end of the constant-current circuit.
7. the constant-current circuit under variation voltage according to claim 1, which is characterized in that the constant-current circuit includes multiple
Triode in parallel and multiple concatenated 4th constant current resistances；
The base stage of the triode of the multiple parallel connection as the control terminal of the constant-current circuit connects the outside after being successively shorted
The first end of circuit and the clamp circuit, the collector of the triode of the multiple parallel connection are used as the constant current after being successively shorted
The input terminal of circuit connects the luminescence unit, and the emitter of the triode of the multiple parallel connection passes sequentially through again after being successively shorted
The multiple concatenated 4th constant current resistance ground connection.
8. the constant-current circuit under variation voltage according to claim 1, which is characterized in that the constant-current circuit includes multiple
5th constant current resistance of triode and multiple parallel connections in parallel；
The base stage of the triode of the multiple parallel connection as the control terminal of the constant-current circuit connects the outside after being successively shorted
The first end of circuit and the clamp circuit, the collector of the triode of the multiple parallel connection are used as the constant current after being successively shorted
The input terminal of circuit connects the luminescence unit；
After the 5th constant current resistance composition parallel resistance group of the multiple parallel connection, one end connects the triode of the multiple parallel connection
Emitter, other end ground connection.
9. the constant-current circuit under variation voltage according to claim 3, which is characterized in that the constant-current circuit is in constant current
When state, the triode Q1 work is in amplification region.
10. the constant-current circuit under variation voltage according to claim 1, which is characterized in that the luminescence unit includes extremely
A few LED light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821443924.9U CN208985025U (en) | 2018-09-04 | 2018-09-04 | A kind of constant-current circuit under variation voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821443924.9U CN208985025U (en) | 2018-09-04 | 2018-09-04 | A kind of constant-current circuit under variation voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208985025U true CN208985025U (en) | 2019-06-14 |
Family
ID=66783238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821443924.9U Active CN208985025U (en) | 2018-09-04 | 2018-09-04 | A kind of constant-current circuit under variation voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208985025U (en) |
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2018
- 2018-09-04 CN CN201821443924.9U patent/CN208985025U/en active Active
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