CN219248112U - Output control circuit - Google Patents
Output control circuit Download PDFInfo
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- CN219248112U CN219248112U CN202320543594.5U CN202320543594U CN219248112U CN 219248112 U CN219248112 U CN 219248112U CN 202320543594 U CN202320543594 U CN 202320543594U CN 219248112 U CN219248112 U CN 219248112U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model relates to the technical field of control circuits, in particular to an output control circuit. According to the output control circuit, the value range of the output voltage and the voltage difference of the output voltage can be adjusted through adjusting the resistance relation in the voltage dividing circuit, so that the application range of the output control circuit is wider, namely, the output control circuit can be adapted to more types of circuits or devices. The output control circuit includes: the output loop is used for outputting voltage and comprises an output capacitor and an output load which are connected in parallel; the sampling loop is connected in parallel with the output loop and comprises a fixed resistance loop and an adjustable resistance loop which are connected in series, wherein the adjustable resistance loop comprises a first resistor, a diode and a second resistor which are connected in series, and the first resistor is connected in parallel with the diode and the second resistor which are connected in series; and the output end of the control loop is connected between the fixed resistance loop and the adjustable resistance loop.
Description
Technical Field
The utility model relates to the technical field of control circuits, in particular to an output control circuit.
Background
In the prior art, a resistor divider circuit is often used in a control circuit to amplify or reduce a voltage signal. For example, in the output voltage control circuit shown in fig. 1, a voltage dividing resistor R is connected in series A Voltage dividing resistor R B Voltage dividing resistor R C Form a resistor voltage dividing circuit to output a load R O An output circuit is formed by the output capacitor C, a resistor divider circuit is connected with the output circuit in parallel, and a control signal U is output ZCS Connected to the voltage dividing resistor R B And a voltage dividing resistor R C Between them.
Wherein, the voltage dividing resistor R C The voltage at two ends is the output control signal U ZCS Output load R O The voltage at two ends is the output voltage U O And then can calculate and obtain an output control signal U zcs And output voltage U O Is the relation of: u (U) O ＝U ZCS *(R A +R B +R C )/R C In (R) A +R B +R C )/R C The output control signal Uzcs follows the output voltage U under the condition of no change O Is linearly varied.
Generally, the output control signal Uzcs in the output control circuit is output by the output voltage control bit of the control chip Us, but due to the self-characteristics of the control chip Us and the limitation of the application circuit, the output control signal Uzcs needs to work normally within a certain voltage range, for example, the value range of Uzcs is 0.5V-1.5V, and in the output voltage control circuit shown in fig. 1, the output voltage maximum value of the output voltage control circuit is U OMAX ＝1.5*(R A +R B +R C )/R C The minimum value of the output voltage control circuit is U OMIN ＝0.5*(R A +R B +R C )/R C Namely, the output voltage control circuit can do when in full load and light loadUp to 3 times the voltage difference, assuming (R A +R B +R C )/R C =100, then U O The range of the value of (C) is 50V-150V.
However, the output voltage range in the output voltage control circuit provided in the prior art is limited by the voltage dividing resistor R A Voltage dividing resistor R B Voltage dividing resistor R C The resistance relation between the voltage difference and the voltage difference is determined, the voltage difference of the output circuit in full load and light load is limited by the voltage difference value range of Uzcs, the voltage difference value range is a fixed value, the requirement of a larger output voltage range cannot be met, and the voltage difference can not be adjusted according to the adaptive circuit. Therefore, output control circuits with various output voltage ranges are required to be designed to be matched with various products, so that the variety of materials is increased, the material preparation and the cost control are inconvenient, and the production control of the products is also inconvenient.
Disclosure of Invention
In view of the above, the present utility model provides an output control circuit. According to the output control circuit, the value range of the output voltage and the voltage difference of the output voltage can be adjusted through adjusting the resistance relation in the voltage dividing circuit, so that the application range of the output control circuit is wider, namely, the output control circuit can be adapted to more types of circuits or devices.
In the technical scheme of the utility model, an output control circuit is provided, which comprises: the output loop is used for outputting voltage and comprises an output capacitor and an output load which are connected in parallel; the sampling loop is connected with the output loop in parallel, the sampling loop comprises a fixed resistance loop and an adjustable resistance loop which are connected in series, the adjustable resistance loop comprises a first resistor, a second resistor and a diode connected with the second resistor in series, and the first resistor is connected with the diode and the second resistor in parallel; and the output control end of the control loop is connected between the fixed resistance loop and the adjustable resistance loop.
According to the technical scheme of the utility model, in the output control circuit, the diode is arranged in the adjustable resistor loop, the diode generates a voltage drop value when being conducted, so that the voltage value at two ends of the second resistor is a control signal voltage value-diode voltage drop, the current value flowing through the second resistor is (control signal voltage value-diode voltage drop)/the second resistor, the first resistor and the second resistor in the adjustable resistor loop are connected in parallel, the current value of the whole adjustable resistor loop is the control signal voltage value/the first resistor+ (control signal voltage value-diode voltage drop)/the second resistor, the current value in the whole output control loop can be in a nonlinear relation with the control signal voltage value, the current value of the adjustable resistor loop is controlled by the control signal voltage value and the diode voltage drop at the same time, and under the condition that the resistance value in the output control loop is unchanged, the output voltage is controlled by the influence of the control signal voltage value and the diode voltage drop at the same time. Therefore, the output control circuit can adjust the value range of the output voltage through the resistance value in the adjusting circuit, and then adjust the voltage difference of the output voltage through the diode voltage drop in the adjusting circuit, namely, the voltage difference of the output voltage is widened on the premise of not changing the voltage difference of the voltage value of the control signal, so that the application range of the output control circuit is wider, and further, more types of circuits or devices can be adapted.
In the technical scheme of the utility model, a control loop in the output control circuit is a control chip. According to the technical scheme of the utility model, the output voltage control pin in the control chip can sample the output loop voltage signal.
Preferably, in the technical scheme of the utility model, the control voltage of the output control end of the control loop in the output control circuit is 0.5-1.5V.
In the technical scheme of the utility model, the first resistor and the second resistor in the output control circuit are thermistors, so that the resistance change range of the adjustable resistor loop is larger, and the voltage output range of the output control circuit is further larger.
Preferably, in the technical scheme of the present utility model, a resistance value of the fixed resistance loop in the output control circuit is more than 20 times of a resistance value of the adjustable resistance loop.
According to the technical scheme of the utility model, the output voltage of the output control circuit is required to be far greater than the voltage value of the control signal output by the control circuit, and the smaller the resistance value of the adjustable resistance circuit relative to the resistance value of the fixed resistance circuit is, the smaller the resistance value of the adjustable resistance circuit relative to the resistance value of the whole sampling circuit is, and the larger the output voltage value of the output control circuit relative to the voltage value of the control signal output by the control circuit is.
Preferably, in the technical scheme of the present utility model, a resistance value of the fixed resistance loop in the output control circuit is more than 500kΩ.
Preferably, in the technical scheme of the present utility model, a resistance value of the adjustable resistance loop in the output control circuit is below 10kΩ.
In the technical scheme of the utility model, the output load in the output control circuit is electrical equipment.
According to the technical scheme of the utility model, the output control circuit not only can be used for adjusting the working voltage range of the electrical equipment, but also can be used for adjusting the voltage difference range of the highest value and the lowest value in the working voltage.
Preferably, in the technical scheme of the present utility model, the electrical equipment in the output control circuit is an LED lighting device.
According to the technical scheme of the utility model, the working voltage of the LED lighting device is controlled by the output control circuit, so that the brightness of the LED lighting device can be adjusted. The output control circuit can be applied to various LED lighting devices having different requirements for the operating voltage range and the voltage difference range between the highest value and the lowest value of the operating voltages.
Drawings
FIG. 1 is a schematic diagram of an output voltage control circuit of the prior art;
fig. 2 is a schematic diagram of an output control circuit provided in an embodiment of the present utility model.
Reference numerals illustrate: 1-output control circuit, 2-output circuit, 3-sampling circuit, 31-fixed resistance circuit, 32-adjustable resistance circuit, 4-control circuit, output voltage terminal U O Ground GND.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.
Fig. 2 is a schematic diagram of an output control circuit provided in an embodiment of the present utility model.
As shown in fig. 2, in an embodiment of the present utility model, there is provided an output control circuit 1 capable of performing output voltage control in accordance with a control signal, the output control circuit 1 including:
an output circuit 2 for outputting a voltage to an external circuit, the output circuit 2 including an output capacitor C and an output load R connected in parallel O Output capacitor C and output load R O Parallel to the output voltage terminal U O The output capacitor C can filter and stabilize the output voltage of the output loop 2 between the output capacitor C and the ground end GND; in fig. 2, the load R is output O In the form of a resistor, in the embodiment of the present utility model, the load R is output O The LED lamp bulb can also be in other forms of elements or circuits which need to adjust the voltage at two ends of the LED lamp bulb.
A sampling loop 3 connected in parallel with the output loop 2, the sampling loop 3 comprising a fixed resistance loop 31 and an adjustable resistance loop 32 connected in series, the adjustable resistance loop 32 comprising a first resistance R 1 A second resistor R 2 And a second resistor R 2 Diodes D and, in series, a first resistor R 1 And diode D and second resistor R 2 In parallel, wherein the cathode of the diode D passes through a second resistor R 2 Is connected with the ground GND, the positive electrode is connected with the output control end ZCS of the control loop 4, and the fixed resistance loop 31 comprises a third resistor R connected in series 3 And a fourth resistor R 4 ；
In the embodiment of the present utility model, in the output control circuit 1, the output voltage value is U O The output current value is I O Output voltage terminal U O Connected to ground GND, i.e. output voltage terminal U, via sampling loop 3 O A fixed resistance loop 31 and an adjustable resistance loop 32 are sequentially connected in series between the fixed resistance loop 31 and the ground GND, wherein the resistance value of the fixed resistance loop 31 is R 3 +R 4 The resistance value of the adjustable resistor loop 32 is R 1 //(R 2 +R D ) The total resistance value of the sampling loop 3 is R 1 //(R 2 +R D )+R 3 +R 4 The total voltage/resistance formula of the output control circuit 1 is obtained as follows:
and because of the first resistor R in the adjustable resistor loop 32 1 In series with a diode D and a second resistor R 2 Parallel connection, output current value I O For flowing through a first resistor R 1 Current value I of (2) 1 And flow through a second resistor R 2 Current value I of (2) 2 A kind of electronic device.
Wherein the first resistor R 1 One end of the resistor (1) is connected with the output control end ZCS in the control loop 4, and the other end is connected with the ground end GND, so as to flow through the first resistor R 1 Current value I of (2) 1 The formula of (2) is as follows:
second resistor R 2 One end of the diode D is connected with an output control end ZCS in the control loop 4, the other end is connected with a ground end GND, and the forward conduction resistance value of the diode D is R D The forward voltage of diode D drops to U D Can flow through the second resistor R 2 Current value I of (2) 2 The formula of (2) is as follows:
to sum up, the output current value I of the output control circuit 1 O Output voltage value U O The method comprises the following steps of:
according to the above formula, the control signal voltage value U of the output control terminal ZCS is obtained under the condition that the elements and circuits of the sampling circuit 3 in the output control loop 1 are unchanged ZCS With the output voltage value U in the control loop 4 O Is varied by a variation of (a) to realize the voltage value U by adjusting the control signal ZCS To control the output voltage U of the output control loop 1 O Is described.
Preferably, in the embodiment of the present utility model, the control loop 4 in the output control circuit 1 is the control chip U S Control chip U S The output voltage control pin is the output control terminal ZCS, and the output control terminal ZCS outputs a control signal for the sampling loop 3.
Further, in the embodiment of the present utility model, the control signal voltage value U of the output control terminal ZCS of the control loop 4 ZCS Ranging from 0.5 to 1.5V. According to the voltage value U of the control signal ZCS The variation range of (1) can obtain the maximum value U of the output voltage of the output control circuit OMAX And output voltage minimum U OMIN The method comprises the following steps of:
wherein the first resistor R 1 A second resistor R 2 Third resistor R 3 And a fourth resistor R 4 The resistance of the diode D is a fixed value, but since the diode D is a nonlinear element, the resistance is not fixed, and thus the control signal voltage U is defined ZCS At 1.5V, the resistance of diode D is equal to R D1 The method comprises the steps of carrying out a first treatment on the surface of the Control signal voltage value U ZCS At 0.5V, the resistance of diode D is equal to R D2 。
In the present embodiment, the control signal voltage value U ZCS The variation range of (1) is 0.5-1.5V in the normal working voltage range of most control chips and control circuits, and the applicability is strong; it should be noted that, in the practical application of the present utility model, the type of the control chip and the voltage value U of the control signal ZCS And may be alternatively modified according to the connected circuits and control requirements.
In an embodiment of the utility model, the control signal voltage value U ZCS The ratio of the maximum value (1.5V) to the minimum value (0.5V) is 3, the voltage value U of the control signal ZCS Is 3 times the voltage difference. And the output voltage value U of the output control circuit 1 O Voltage difference of (i.e. output voltage maximum U) OMAX And output voltage minimum U OMIN The ratio of (2) is:
preferably, in the embodiment of the present utility model, the resistance value of the fixed resistance circuit 31 in the output control circuit 1 is 20 times or more the resistance value of the adjustable resistance circuit 32.
In general, the output voltage value U of the output control circuit 1 O The voltage value U of the control signal which is required to be far greater than the output of the control loop 4 ZCS The smaller the resistance value of the adjustable resistance circuit 32 relative to the resistance value of the fixed resistance circuit 31 is required, namelyThe smaller the resistance value of the adjustable resistor loop 32 relative to the resistance value of the whole sampling circuit 3, the smaller the output voltage value U of the output control circuit 1 O Voltage value U relative to control signal output by control loop 4 ZCS The larger.
Still preferably, in the embodiment of the present utility model, the resistance value of the fixed resistance circuit 31 in the output control circuit 1 is 500kΩ or more, and the resistance value of the adjustable resistance circuit 32 is 10kΩ or less.
Specifically, in the embodiment of the present utility model, the first resistor R 1 =10kΩ, second resistor R 2 =10kΩ, third resistor R 3 =270 kΩ, fourth resistor R 4 ＝270kΩ。
At the same time, due to the resistance R of the adjustable resistor loop 32 1 //(R 2 +R D ) A resistance value R much smaller than that of the fixed resistance circuit 31 3 +R 4 Therefore, the resistance value of the adjustable resistor loop 32 can be ignored when calculating the total resistance value of the sampling circuit 3, and the following can be obtained:
since the resistance value in the sampling circuit 3 is extremely large, the output current value I of the output control circuit 1 O Extremely small, i.e. the current I flowing through the diode D when the output control circuit 1 is outputting light load and full load 2 As well as the variation thereof, the forward voltage of the diode D is reduced to U because the current of the diode is changed very little as known from the volt-ampere characteristic of the diode D The variation is also small, and the actual test output control circuit 1 outputs U with light load and full load D Are all equal to about 0.4V, and are substituted into the above formula to obtain
Since 1.5/0.5=3 and 1.1/0.1=11 > 3, it is possible to obtain
In the embodiment of the present utility model, the output control circuit 1 can control the signal voltage value U without changing ZCS On the premise of voltage difference of (a) widening the output voltage value U O The output control circuit 1 is made more widely applicable and thus can be adapted to more types of circuits or devices.
In the embodiment of the present utility model, the output load in the output control circuit 1 is an electrical device, and the output control circuit 1 can adjust not only the operating voltage range of the electrical device but also the voltage difference range between the highest value and the lowest value of the operating voltages.
Preferably, in the embodiment of the present utility model, the electrical device in the output control circuit 1 is an LED lighting device, and the operation voltage of the LED lighting device is controlled by the output control circuit 1, so that the brightness of the LED lighting device can be adjusted. The output control circuit can be applied to various LED lighting devices having different requirements for the operating voltage range and the voltage difference range between the highest value and the lowest value of the operating voltages.
The technical solution of the present utility model has been described so far with reference to the accompanying drawings. However, it will be readily appreciated by those skilled in the art that the scope of the present utility model is not limited to the above-described specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will fall within the scope of the present utility model.
Claims (9)
1. An output control circuit, comprising:
the output circuit is used for outputting voltage and comprises an output capacitor and an output load which are connected in parallel;
the sampling circuit is connected in parallel with the output circuit, the sampling circuit comprises a fixed resistance circuit and an adjustable resistance circuit which are connected in series, the adjustable resistance circuit comprises a first resistor, a second resistor and a diode connected in series with the second resistor, and the first resistor is connected in parallel with the diode and the second resistor;
and the output control end of the control loop is connected between the fixed resistance loop and the adjustable resistance loop.
2. The output control circuit of claim 1, wherein the control loop is a control chip.
3. The output control circuit of claim 1, wherein the control voltage at the output control terminal of the control loop is 0.5-1.5V.
4. The output control circuit of claim 1 wherein the first resistor and the second resistor are thermistors.
5. The output control circuit of claim 1, wherein the resistance value of the fixed resistance loop is more than 20 times the resistance value of the adjustable resistance loop.
6. The output control circuit of claim 5 wherein the fixed resistance loop has a resistance value of 500kΩ or more.
7. The output control circuit of claim 5 wherein the resistance of the adjustable resistive loop is 10kΩ or less.
8. The output control circuit of one of claims 1-7, wherein the output load is an electrical device.
9. The output control circuit of claim 8 wherein the electrical device is an LED lighting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320543594.5U CN219248112U (en) | 2023-03-15 | 2023-03-15 | Output control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320543594.5U CN219248112U (en) | 2023-03-15 | 2023-03-15 | Output control circuit |
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| Publication Number | Publication Date |
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| CN219248112U true CN219248112U (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320543594.5U Active CN219248112U (en) | 2023-03-15 | 2023-03-15 | Output control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116915073A (en) * | 2023-09-06 | 2023-10-20 | 深圳莱福德科技股份有限公司 | Method for widening constant-current output voltage range |
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2023
- 2023-03-15 CN CN202320543594.5U patent/CN219248112U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116915073A (en) * | 2023-09-06 | 2023-10-20 | 深圳莱福德科技股份有限公司 | Method for widening constant-current output voltage range |
| CN116915073B (en) * | 2023-09-06 | 2024-01-05 | 深圳莱福德科技股份有限公司 | Method for widening constant-current output voltage range |
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