CN202067170U - Voltage stabilizing reference circuit with adjustable temperature drift coefficient - Google Patents
Voltage stabilizing reference circuit with adjustable temperature drift coefficient Download PDFInfo
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- CN202067170U CN202067170U CN2011200781987U CN201120078198U CN202067170U CN 202067170 U CN202067170 U CN 202067170U CN 2011200781987 U CN2011200781987 U CN 2011200781987U CN 201120078198 U CN201120078198 U CN 201120078198U CN 202067170 U CN202067170 U CN 202067170U
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- voltage stabilizing
- diode
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- integrated voltage
- divider resistance
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Abstract
The utility model discloses a voltage stabilizing reference circuit with an adjustable temperature drift coefficient. The reference circuit comprises a voltage stabilizing reference base unit and an error amplifying unit which are connected in sequence. The voltage stabilizing reference base unit comprises diodes D1 and D2, an integrated voltage stabilizing reference U1, a current-limiting resistor R1, a first divider resistor R2, a second divider resistor R3 and an auxiliary DC power supply VCC (Volt Current Condenser), wherein one end of the current-limiting resistor R1 is connected with the auxiliary DC power supply VCC and the other end is connected with one end of the first divider resistor R2 and the cathode of the integrated voltage stabilizing reference U1; the other end of the first divider resistor R2 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the anode of the diode D2, and the cathode of the diode D2 is connected with the control terminal of the integrated voltage stabilizing reference U1 and one end of the second divider resistor R3; and the other end of the second divider resistor R3 is connected with the anode of the integrated voltage stabilizing reference U1 and is grounded, and the cathode of the integrated voltage stabilizing reference U1 is connected to the input terminal of the error amplifying unit. The reference circuit conforms to the properties of lamp beads of LEDs, and voltage-stabilized sources adopting the reference circuit can be directly used for driving the lamp beads of the LEDs without adding an external constant-current circuit. The reference circuit has the advantages of simple circuit structure, high reliability and low cost.
Description
Technical field
The utility model relates to light emitting diode and drives and the control technology field particularly a kind of voltage stabilizing reference circuit of adjustable temperature coefficient of deviation.
Background technology
At present, because of light emitting diode has the characteristic of energy-conservation and environmental protection, the application on light fixture more and more widely.Because the PN junction of light emitting diode has negative temperature coefficient feature, its PN junction voltage reduces with the rising of temperature, therefore requires driving power voltage also to change with temperature, rather than invariable, thereby reaches the protection to light emitting diode.And general switching power supply is the requirement of satisfying other equipment such as telecommunications, and output voltage is all highly stable, and temperature drift is very little, and temperature coefficient is generally less than 50ppm/ ℃.If come driven for emitting lights diode lights pearl with it, the electric current of light emitting diode raises and sharply raises along with temperature, and power consumption also raises with temperature significantly to be increased, and is easy to damage.For head it off, produced various constant-current driven chips, constant-current control circuit, but increased cost, also wasted a large amount of resources.
In realizing process of the present utility model, the inventor finds to exist at least in the prior art defectives such as circuit structure complexity and cost height.
The utility model content
The technical problems to be solved in the utility model is to overcome the prior art circuits complexity, and defect of high cost provides a kind of voltage stabilizing reference circuit of adjustable temperature coefficient of deviation, to realize that circuit structure is succinct, cost is low and the high advantage of reliability.
In order to solve the problems of the technologies described above, the utility model provides following technical scheme: a kind of voltage stabilizing reference circuit of adjustable temperature coefficient of deviation comprises the voltage stabilizing reference data unit and the error amplifying unit that connect in turn.
Further, described voltage stabilizing reference data unit comprises diode D1, D2, integrated voltage stabilizing benchmark U1, current-limiting resistance R1, the first divider resistance R2, the second divider resistance R3 and auxiliary dc power supply VCC; Wherein: the termination of current-limiting resistance R1 is assisted dc power supply VCC, the end of another termination first divider resistance R2 and the negative electrode of integrated voltage stabilizing benchmark U1;
The anode of another terminating diode D1 of the first divider resistance R2, the negative electrode of diode D1 connects the anode of diode D2, and the negative electrode of diode D2 connects the control end of integrated voltage stabilizing benchmark U1 and is connected with the end of the second divider resistance R3; Anode and the ground connection of the integrated voltage stabilizing benchmark of another termination U1 of the second divider resistance R3, the negative electrode of integrated voltage stabilizing benchmark U1 is connected to the input end of error amplifying unit.
Further, described voltage stabilizing reference data unit comprises diode D1, integrated voltage stabilizing benchmark U1, current-limiting resistance R1, the first divider resistance R2 and the second divider resistance R3 and auxiliary dc power supply VCC; Wherein:
The end of current-limiting resistance R1 connects auxiliary dc power supply VCC, and the other end connects the end of the first divider resistance R2 and links to each other with control end with the negative electrode of integrated voltage stabilizing benchmark U1; The end of another termination second divider resistance R3 of the first divider resistance R2, the anode of another terminating diode D1 of the second divider resistance R3, the negative electrode of diode D1 are connected with the anode of integrated voltage stabilizing benchmark U1 and ground connection.
Further, described voltage stabilizing reference data unit comprises diode D1, D2, integrated voltage stabilizing benchmark U1, and current-limiting resistance R1 and auxiliary dc power supply VCC; Wherein: the end of current-limiting resistance R1 connects auxiliary dc power supply VCC, the other end connects the anode of diode D1, the negative electrode of diode D1 links to each other with the anode of diode D2, the negative electrode of diode D2 links to each other with control end with the negative electrode of integrated voltage stabilizing benchmark U1, the plus earth of integrated voltage stabilizing benchmark U1.
The voltage stabilizing reference circuit of adjustable temperature coefficient of deviation of the present utility model, because the reference voltage of its generation is with temperature drift, the output voltage of Switching Power Supply is also corresponding to temperature drift, when temperature raises, reference voltage descends, and the output voltage of Switching Power Supply also descends.The trim parameter, make the temperature drift coefficient of the temperature drift coefficient of reference voltage near the LED light lamp pearl, just can use the lamp pearl of the direct sending and receiving optical diode of output of Switching Power Supply, electric current in the lamp pearl just can obviously not increase with the rising of temperature, just can drive safely, need not add constant-current circuit, thereby realize that circuit is succinct, cost low and the high advantage of reliability.
Description of drawings
Fig. 1 is the first embodiment synoptic diagram of the voltage stabilizing reference circuit of adjustable temperature coefficient of deviation of the present utility model.
Fig. 2 is the flexible connection synoptic diagram of first embodiment of the voltage stabilizing reference circuit of adjustable temperature coefficient of deviation of the present utility model.
Fig. 3 is another flexible connection synoptic diagram of first embodiment of the voltage stabilizing reference circuit of adjustable temperature coefficient of deviation of the present utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, the utility model embodiment is described in further detail below in conjunction with accompanying drawing.
See also Fig. 1, Fig. 1 is the first embodiment synoptic diagram of the voltage stabilizing reference circuit of adjustable temperature coefficient of deviation of the present utility model.As shown in Figure 1, the voltage stabilizing reference circuit of this adjustable temperature coefficient of deviation is made up of the voltage stabilizing reference data unit and the error amplifying unit that connect in turn.Wherein, this voltage stabilizing reference data unit comprises diode D1, D2, integrated voltage stabilizing benchmark U1, current-limiting resistance R1, the first divider resistance R2, the second divider resistance R3 and auxiliary dc power supply VCC; The termination of current-limiting resistance R1 is assisted dc power supply VCC, the end of another termination first divider resistance R2 and the negative electrode of integrated voltage stabilizing benchmark U1; The anode of another terminating diode D1 of the first divider resistance R2, the negative electrode of diode D1 connects the anode of diode D2, and the negative electrode of diode D2 connects the control end of integrated voltage stabilizing benchmark U1 and is connected with the end of the second divider resistance R3; Anode and the ground connection of the integrated voltage stabilizing benchmark of another termination U1 of the second divider resistance R3, the negative electrode of integrated voltage stabilizing benchmark U1 is connected to the input end of error amplifying unit.
Concrete implementation procedure, as shown in Figure 1, auxiliary direct current supply VCC is the U1 power supply through the R1 current limliting, and R2, D1, D2, R3 be to the sampling of U1 cathode voltage, and through R2, D1 is linked into the control end of U1 after D2 and the R3 dividing potential drop, obtains voltage VREF at the negative electrode of D2.Diode D1 and D2 owing in sampling loop, connected, D1, D2 has negative temperature coefficient feature, and the voltage at their two ends can reduce with the rising of temperature, cause U1 cathode voltage VREF also can to reduce with the rising of temperature, identical with the temperature characterisitic of LED light lamp pearl.VREF is linked into error amplifier U2, relatively amplifies with the output voltage sampled signal that is linked into U2, outputs to the voltage stabilizing control loop of Switching Power Supply, and switch power source output voltage Vo+ is changed with the VREF equal proportion.
See also Fig. 2, Fig. 2 is the flexible connection synoptic diagram of first embodiment of the voltage stabilizing reference circuit of adjustable temperature coefficient of deviation of the present utility model.As shown in Figure 2, this voltage stabilizing reference data unit comprises diode D1, integrated voltage stabilizing benchmark U1, current-limiting resistance R1, the first divider resistance R2 and the second divider resistance R3 and auxiliary dc power supply VCC; Wherein, the end of current-limiting resistance R1 connects auxiliary dc power supply VCC, and the other end connects the end of the first divider resistance R2 and links to each other with control end with the negative electrode of integrated voltage stabilizing benchmark U1; The end of another termination second divider resistance R3 of the first divider resistance R2, the anode of another terminating diode D1 of the second divider resistance R3, the negative electrode of diode D1 are connected with the anode of integrated voltage stabilizing benchmark U1 and ground connection.The connection of other parts circuit is identical with Fig. 1 counterpart connection, does not repeat them here.
See also Fig. 3, Fig. 3 is another flexible connection synoptic diagram of first embodiment of the voltage stabilizing reference circuit of adjustable temperature coefficient of deviation of the present utility model.As shown in Figure 3, this voltage stabilizing reference data unit comprises diode D1, D2, integrated voltage stabilizing benchmark U1, and current-limiting resistance R1 and auxiliary dc power supply VCC; Wherein, the end of current-limiting resistance R1 connects auxiliary dc power supply VCC, the other end connects the anode of diode D1, the negative electrode of diode D1 links to each other with the anode of diode D2, the negative electrode of diode D2 links to each other with control end with the negative electrode of integrated voltage stabilizing benchmark U1, the plus earth of integrated voltage stabilizing benchmark U1.The connection of other parts circuit is identical with Fig. 1 counterpart connection, does not repeat them here.
The above only is preferred embodiment of the present utility model, and is in order to restriction the utility model, not all within spirit of the present utility model and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (4)
1. the voltage stabilizing reference circuit of an adjustable temperature coefficient of deviation is characterized in that, comprises the voltage stabilizing reference data unit and the error amplifying unit that connect in turn.
2. the voltage stabilizing reference circuit of adjustable temperature coefficient of deviation according to claim 1, it is characterized in that, described voltage stabilizing reference data unit comprises diode D1, D2, integrated voltage stabilizing benchmark U1, current-limiting resistance R1, the first divider resistance R2, the second divider resistance R3 and auxiliary dc power supply VCC; Wherein:
The termination of described current-limiting resistance R1 is assisted dc power supply VCC, the end of another termination first divider resistance R2 and the negative electrode of integrated voltage stabilizing benchmark U1;
The anode of another terminating diode D1 of the first divider resistance R2, the negative electrode of diode D1 connects the anode of diode D2, and the negative electrode of diode D2 connects the control end of integrated voltage stabilizing benchmark U1 and is connected with the end of the second divider resistance R3;
Anode and the ground connection of the integrated voltage stabilizing benchmark of another termination U1 of the second divider resistance R3, the anode of integrated voltage stabilizing benchmark U1 is connected to the input end of error amplifying unit.
3. the voltage stabilizing reference circuit of adjustable temperature coefficient of deviation according to claim 1, it is characterized in that described voltage stabilizing reference data unit comprises diode D1, integrated voltage stabilizing benchmark U1, current-limiting resistance R1, the first divider resistance R2 and the second divider resistance R3 and auxiliary dc power supply VCC; Wherein:
The end of described current-limiting resistance R1 connects auxiliary dc power supply VCC, and the other end connects the end of the first divider resistance R2 and links to each other with control end with the negative electrode of integrated voltage stabilizing benchmark U1;
The end of another termination second divider resistance R3 of the first divider resistance R2, the anode of another terminating diode D1 of the second divider resistance R3, the negative electrode of diode D1 are connected with the anode of integrated voltage stabilizing benchmark U1 and ground connection.
4. the voltage stabilizing reference circuit of adjustable temperature coefficient of deviation according to claim 1 is characterized in that, described voltage stabilizing reference data unit comprises diode D1, D2, integrated voltage stabilizing benchmark U1, and current-limiting resistance R1 and auxiliary dc power supply VCC; Wherein:
The end of described current-limiting resistance R1 connects auxiliary dc power supply VCC, the other end connects the anode of diode D1, the negative electrode of diode D1 links to each other with the anode of diode D2, and the negative electrode of diode D2 links to each other with control end with the negative electrode of integrated voltage stabilizing benchmark U1, the plus earth of integrated voltage stabilizing benchmark U1.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200781987U CN202067170U (en) | 2011-08-08 | 2011-08-08 | Voltage stabilizing reference circuit with adjustable temperature drift coefficient |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200781987U CN202067170U (en) | 2011-08-08 | 2011-08-08 | Voltage stabilizing reference circuit with adjustable temperature drift coefficient |
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| CN202067170U true CN202067170U (en) | 2011-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200781987U Expired - Fee Related CN202067170U (en) | 2011-08-08 | 2011-08-08 | Voltage stabilizing reference circuit with adjustable temperature drift coefficient |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103838283A (en) * | 2012-11-21 | 2014-06-04 | 深圳市海洋王照明工程有限公司 | Voltage stabilizing circuit |
-
2011
- 2011-08-08 CN CN2011200781987U patent/CN202067170U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103838283A (en) * | 2012-11-21 | 2014-06-04 | 深圳市海洋王照明工程有限公司 | Voltage stabilizing circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111207 Termination date: 20140808 |
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| EXPY | Termination of patent right or utility model |