CN114189961A - Current control circuit and monitoring equipment - Google Patents
Current control circuit and monitoring equipment Download PDFInfo
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- CN114189961A CN114189961A CN202111367306.7A CN202111367306A CN114189961A CN 114189961 A CN114189961 A CN 114189961A CN 202111367306 A CN202111367306 A CN 202111367306A CN 114189961 A CN114189961 A CN 114189961A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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- 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 invention provides a current control circuit and monitoring equipment, which are used for solving the problem of poor light supplementing effect of an LED for supplementing light. The current control circuit is applied to monitoring equipment and comprises a processor, a sampling unit, a driving unit and a current control unit, wherein the sampling unit samples the output end of the light-emitting unit, the driving unit generates driving current for driving the light-emitting unit to emit light according to a received pulse signal sent by the processor and a received first input voltage, the sampling voltage of the output end of the light-emitting unit is obtained, and the current control unit reduces the driving current according to a received first control signal sent by the processor. Because the current control unit can reduce drive current under the control of first control signal, the drive current scope that consequently obtains is bigger than the drive current scope that obtains among the prior art to can satisfy the actual demand of supervisory equipment's light filling, improve the light filling effect.
Description
Technical Field
The invention relates to the field of security monitoring, in particular to a current control circuit and monitoring equipment.
Background
In the field of security monitoring, a monitoring device, such as a video camera, generally needs to supplement Light, and the Light supplement is performed by controlling the brightness of an LED (Light Emitting Diode). In the light supplementing process, the current flowing through the LED lamp can be adjusted according to different modes, and different brightness of LED display is achieved.
In practical applications, the camera may have different fill light modes, such as a pure white light mode, a pure infrared mode, and an infrared-white light mixed mode. When the pure white light mode and the pure infrared mode are used, the LED lamp generally operates in the maximum current state in order to achieve the optimal light supplement effect, and the white light can normally operate only with a small current in the infrared-white light mixed mode.
In the prior art, the ratio of the minimum current to the maximum current that can be output by the current LED driving chip is generally 1%, but in order to achieve the best effect in the pure white light mode, the hardware generally sets a relatively high maximum output current. For example, if the maximum white current set on the hardware is 400 ma, the minimum current that the white light can reach is 4 ma, but the 4 ma still makes the white light too bright for the ir-white mixing mode, so a lower current is needed to achieve a better ir-white mixing effect.
In summary, in the prior art, the current provided by the LED for supplementing light in the monitoring device cannot meet the actual requirement, and the light supplementing effect is poor.
Disclosure of Invention
The invention provides a current control circuit and monitoring equipment, which are used for solving the problems that the current provided for an LED for light supplement in the prior art cannot meet the actual requirement and the light supplement effect is poor.
In a first aspect, an embodiment of the present invention provides a current control circuit, which is applied to a monitoring device, and includes:
a processor;
the sampling unit is connected with the output end and the grounding end of the light-emitting unit and is used for sampling the voltage of the output end of the light-emitting unit;
the driving unit is connected with the processor, the sampling unit and the input end of the light-emitting unit, and is used for generating driving current for driving the light-emitting unit to emit light according to the received pulse signal sent by the processor and the received first input voltage and acquiring sampling voltage of the output end of the light-emitting unit;
and the current control unit is connected with the processor and the output end of the light-emitting unit and used for reducing the driving current according to the received first control signal sent by the processor.
In a possible implementation manner, a first input end of the driving unit is connected to a first voltage end, a second input end of the driving unit is connected to a first output end of the processor, a sampling end of the driving unit is connected to a first end of the sampling unit, and an output end of the driving unit is connected to an input end of the light emitting unit;
the second end of the sampling unit is grounded;
the first input end of the current control unit is connected with the second voltage end, the second input end of the current control unit is connected with the second output end of the processor, and the output end of the current control unit is connected with the output end of the light-emitting unit;
the first voltage end is used for outputting the first input voltage, and the second voltage end is used for outputting the second input voltage.
In one possible implementation, the current control unit is specifically configured to:
according to the first control signal, a path between a first input end of the current control unit and an output end of the current control unit is conducted;
and according to a second control signal sent by the processor, disconnecting a path between the first input end of the current control unit and the output end of the current control unit.
In one possible implementation, the current control unit includes a transistor and a first resistor;
a first end of the transistor is used as a first input end of the current control unit, a second end of the transistor is connected with a first end of the first resistor, and a control end of the transistor is used as a second input end of the current control unit;
and the second end of the first resistor is used as the output end of the current control unit.
In one possible implementation, the sampling unit includes a second resistor;
the first end of the second resistor is connected with the output end of the light-emitting unit, and the second end of the second resistor is grounded.
In one possible implementation, the circuit further includes a third resistor;
the third resistor is connected between the sampling pin of the driving unit and the output end of the light-emitting unit.
In one possible implementation, the circuit further includes a first filtering unit and a second filtering unit;
the first filtering unit is respectively connected with the output end of the driving unit, the input end of the light-emitting unit and the grounding end and is used for filtering the voltage signal output by the driving unit;
the second filtering unit is connected with the first input end and the grounding end of the driving unit and is used for filtering the first input voltage.
In one possible implementation, the first filtering unit includes an inductor and a first capacitor;
the first end of the inductor is connected with the output end of the driving unit, and the second end of the inductor is connected with the first end of the first capacitor and the input end of the light-emitting unit;
the second end of the capacitor is grounded.
In one possible implementation, the second filtering unit includes a second capacitor;
the first end of the second capacitor is connected with the first input end of the driving unit, and the second end of the second capacitor is grounded.
In a second aspect, an embodiment of the present invention provides a monitoring device, including a light emitting unit and a current control circuit as described in any one of the preceding.
In the embodiment of the invention, in the current control circuit of the monitoring device, the sampling unit samples the voltage of the output end of the light-emitting unit, the driving unit generates the driving current for driving the light-emitting unit to emit light according to the received pulse signal sent by the processor and the received first input voltage, and obtains the sampling voltage of the output end of the light-emitting unit, and the current control unit reduces the driving current according to the received first control signal sent by the processor. Because the current control unit can reduce drive current under the control of first control signal, the drive current scope that consequently obtains is bigger than the drive current scope that obtains among the prior art to can satisfy the actual demand of supervisory equipment's light filling, improve the light filling effect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a current control circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of another current control circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of another current control circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of another current control circuit according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of another current control circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a monitoring device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, specific embodiments of a current control circuit and a monitoring device according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. It should be noted that the shapes of the various figures in the drawings are not to scale and are intended to illustrate the invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in sequences other than those illustrated or otherwise described herein. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Semiconductor illumination is the novel lighting technology who gradually promotes in market in recent years, is a solid cold light source, has a great deal of advantages such as high efficiency, long-lived, safe environmental protection, small, high reliability, response speed are fast. The LED has the advantages of low energy consumption, small heat dissipation and the like, so that the LED is widely applied to various lighting devices, in the field of security monitoring, the camera adopts the LED for light supplement, the driving circuit is very important for semiconductor lighting, but the proportion of the maximum current and the minimum current which can be output by the current LED driving chip is not enough to meet the driving current required by the camera in a light mixing working mode.
Based on the above problem, the embodiments of the present invention provide a current control circuit and a corresponding monitoring device, so that the monitoring device can operate under normal operating current in different light compensation modes, thereby improving the light compensation effect.
As shown in fig. 1, a current control circuit provided for an embodiment of the present invention is applied to a monitoring device, and includes:
a processor 10;
the sampling unit 40 is connected with the output end and the grounding end of the light-emitting unit, and the sampling unit 40 is used for sampling the voltage of the output end of the light-emitting unit;
the driving unit 20 is connected with the processor 10, the sampling unit 40 and the input end of the light-emitting unit, and the driving unit 20 is configured to generate a driving current for driving the light-emitting unit to emit light according to the received pulse signal sent by the processor 10 and the received first input voltage V1, and obtain a sampling voltage at the output end of the light-emitting unit;
and a current control unit 30 connected to the processor 10 and an output terminal of the light emitting unit, wherein the current control unit 30 is configured to reduce the driving current according to the received first control signal sent by the processor 10.
In the embodiment of the invention, the sampling unit samples the output end of the light-emitting unit, the driving unit generates a driving current for driving the light-emitting unit to emit light according to the received pulse signal sent by the processor and the received first input voltage, and obtains the sampling voltage of the output end of the light-emitting unit, and the current control unit reduces the driving current according to the received first control signal sent by the processor. Because the current control unit can reduce drive current under the control of first control signal, the drive current scope that consequently obtains is bigger than the drive current scope that obtains among the prior art to can satisfy the actual demand of supervisory equipment's light filling, improve the light filling effect.
In a specific implementation, a first input terminal of the driving unit 20 is connected to the first voltage terminal V1, a second input terminal of the driving unit 20 is connected to a first output terminal of the processor 10, a sampling terminal of the driving unit 20 is connected to a first terminal of the sampling unit 40, and an output terminal of the driving unit 20 is connected to an input terminal of the light emitting unit;
the second end of the sampling unit 40 is grounded;
a first input end of the current control unit 30 is connected with the second voltage end V2, a second input end of the current control unit 30 is connected with a second output end of the processor 10, and an output end of the current control unit 30 is connected with an output end of the light emitting unit;
the first voltage terminal V1 is used for outputting a first input voltage, and the second voltage terminal V2 is used for outputting a second input voltage.
In the embodiment of the present invention, when the current control unit 30 receives the second control signal sent by the processor 10, the path between the first input terminal and the output terminal of the current control unit 30 is disconnected, that is, no current is supplied to the output terminal of the light emitting unit, and at this time, the driving current for driving the light emitting unit, that is, the driving unit 20, is generated according to the pulse signal and the first input voltage; when the current control unit 30 receives the first control signal sent by the processor 10, the path between the first input end and the output end of the current control unit 30 is switched on, because the first input end and the second voltage end of the current control unit 30 are connected, the current control unit 30 can provide current for the output end of the light emitting unit, according to kirchhoff's law, the driving current generated by the driving unit 20 can be reduced, the driving current can be reduced, the range of the driving current is enlarged, the actual requirement of the light supplement of the monitoring device can be met, and the light supplement effect is improved.
Specifically, when the current control unit 30 provides a current to the output terminal of the light emitting unit, the current control unit 30 may conduct a path between the first input terminal of the current control unit 30 and the output terminal of the current control unit 30 under the control of the first control signal, so that a current may be generated and provided to the output terminal of the light emitting unit.
In implementation, the driving current is large, so the light supplement effect is not good, and in order to obtain a lower current, the current is provided to the output end of the light emitting unit, so that the purpose of reducing the driving current is achieved, and the light supplement effect is improved.
The current control unit provided by the embodiment of the invention can comprise a transistor and a first resistor;
a first end of the transistor is used as a first input end of the current control unit, a second end of the transistor is connected with a first end of the first resistor, and a control end of the transistor is used as a second input end of the current control unit;
the second end of the first resistor is used as the output end of the current control unit.
In the embodiment of the invention, the transistor can be a P-type transistor or an N-type transistor, and the P-type transistor is cut off under the action of a high-level signal and is turned on under the action of a low-level signal. The N-type transistor is turned on under the action of a high-level signal and is turned off under the action of a low-level signal. The Transistor may be a Thin Film Transistor (TFT) or a Metal Oxide Semiconductor (MOS) field effect Transistor, and is not limited herein. The driving unit provided by the embodiment of the invention may be a driving chip, such as SY8718H, wherein the first voltage terminal and/or the second voltage terminal may be a pin on the driving chip. The light emitting unit may be at least one LED, and the input end of the light emitting unit is an anode of the LED, and the output end of the light emitting unit is a cathode of the LED.
The following is a detailed description of a specific circuit structure provided by an embodiment of the present invention.
As shown in fig. 2, in the current control circuit provided by the embodiment of the present invention, the current control unit 30 may include a transistor Q and a first resistor R1;
the first end of the transistor Q is connected with the second voltage end V2, the second end of the transistor Q is connected with the first end of the first resistor R1, and the control end of the transistor Q is connected with the second output end of the processor;
a second terminal of the first resistor R1 is connected to the output terminal of the light emitting unit.
The voltage output by the second voltage terminal V2 may be 12V.
After receiving the first control signal, the transistor Q turns on a path between the first terminal of the transistor Q and the second terminal of the transistor Q, and the current control unit 30 generates a current and provides the current to the output terminal of the light emitting unit; when the transistor Q receives the second control signal, the path between the first terminal of the transistor Q and the second terminal of the transistor Q is disconnected, and the current control unit 30 cannot generate a current, that is, cannot supply a current to the output terminal of the light emitting unit.
Specifically, as shown in fig. 2, the sampling unit 40 according to the embodiment of the present invention may be a second resistor R2, and the second resistor R2 is connected between the output end of the light emitting unit and the ground end, and is used for sampling the voltage at the output end of the light emitting unit.
The driving unit 20 obtains the sampling voltage through the sampling pin, and the sampling pin of the driving unit 20 is a feedback terminal, so that feedback control can be realized to stabilize the driving current.
As shown in fig. 3, the current control circuit according to the embodiment of the present invention may further include a first filtering unit 50 and a second filtering unit 60;
the first filtering unit 50 is connected to the output terminal of the driving unit 20, the input terminal of the light emitting unit, and the ground terminal, and is configured to filter the voltage signal output by the driving unit 20;
the second filtering unit 60 is connected to the first input terminal and the ground terminal of the driving unit 20, and is configured to filter the first input voltage V1.
In the above embodiment, the first filtering unit 50 filters the voltage output by the driving unit 20, and the second filtering unit 60 filters the voltage input to the driving unit 20, so that the voltage input to the driving unit and the voltage output by the driving unit are more stable, the stability of the circuit is improved, and the performance of the circuit is improved.
As shown in fig. 4, which is a schematic diagram of another current control circuit provided in the embodiment of the present invention, as can be seen from fig. 4, the first filtering unit 50 may include an inductor L and a first capacitor C1;
a first end of the inductor L is connected to the output end of the driving unit 20, and a second end of the inductor L is connected to a first end of the first capacitor C1 and the input end of the light emitting unit;
the second terminal of the first capacitor C1 is connected to ground.
The second filtering unit 60 may include a second capacitor C2;
a first terminal of the second capacitor C2 is connected to the first input terminal of the driving unit 20, and a second terminal of the second capacitor C2 is grounded.
As shown in fig. 4, the current control circuit according to the embodiment of the present invention may further include a third resistor R3;
a first terminal of the third resistor R3 is connected to the sampling pin of the driving unit 20, and a second terminal of the third resistor R3 is connected to the output terminal of the light emitting unit.
The third resistor R3 can protect the sampling pin FB of the driving unit 20, and prevent the sampling pin FB of the driving unit 20 from being damaged when a short circuit suddenly occurs outside, thereby playing a role in protection.
In a specific implementation of the current control circuit provided in the embodiment of the present invention, the processor 10 may control the first input voltage output from the first voltage terminal V1 according to a light emitting mode of the light emitting unit.
The light emitting mode of the light emitting unit may be user-triggered, and the processor 10 receives a user-triggered control command and controls the first input voltage V1 output from the first voltage terminal V1 according to the received control command.
It should be noted that the first voltage terminal V1 may be an output pin of the processor 10, as shown in fig. 5.
For ease of understanding, the present invention is described below in terms of specific examples.
Taking a camera as an example, the light emitting unit will be described by taking a white LED on the camera as an example.
Example 1:
based on the circuit diagram shown in fig. 5, a user triggers a red-white light mixing mode, the processor 10 receives a control instruction of the red-white light mixing mode triggered by the user, and the processor 10 outputs a first input voltage V1 according to the received control instruction and outputs a pulse signal to the driving unit 20; the driving unit 20 generates a driving current according to the received first input voltage V1 and the pulse signal.
If the processor 10 outputs a high-level signal to the transistor Q, the transistor Q is not turned on, the path between the second voltage terminal V2 and the cathode of the LED is disconnected, the driving current at this time is the driving current generated by the driving unit, the obtained maximum driving current is Iled equal to 0.1V/R2, wherein 0.1V is the voltage value of the voltage output by the driving unit, and if the resistance value of R2 is 0.5 ohm, Iled is 200mA, since SY871 8718H supports that the minimum duty ratio of the DIM signal is 5%, the range of the driving current can be obtained to 10mA to 200mA by adjusting the duty ratio of the DIM signal, that is, the driving current can reach 10mA at the minimum, and can reach 200mA at the maximum;
it should be noted that 0.1V in the above embodiments is only an example, and the value is determined by a reference voltage source inside the driver chip, and the value is different for different models of driver chips, for example, 0.05V, 0.15V, 0.2V, and the like. After the driver chip is selected, the maximum drive current is set by selecting a resistor with an appropriate resistance value.
If the processor 10 outputs a low-level signal to the transistor Q, the transistor Q is turned on, that is, a path between the second voltage terminal V2 and the cathode of the LED is turned on, the current control unit 30 may inject a current into the cathode of the LED, if the second input voltage V2 is 12V, the current I1 generated by the current control unit 30 is (12V-0.1V)/R1, if the resistance value of R1 is 120 ohms, I1 is approximately equal to 99mA, and according to kirchhoff's law, the maximum driving current that the LED lamp can obtain is Iled equal to 200mA-99mA, that is, 101 mA. By adjusting the duty ratio of the DIM signal, 5 mA-101 mA can be obtained, and the minimum drive current which can be obtained at the moment is 5 mA. So that the drive current range can be made wider.
When the resistance value of R1 is selected to be smaller, the minimum drive current obtained will be less than 5mA, and the range of the drive current can be wider.
Based on the same inventive concept, the embodiment of the present invention further provides a monitoring device, as shown in fig. 6, which may include a light emitting unit 70 and any one of the current control circuits 71 as described above. The principle of the monitoring device for solving the problem is similar to that of the current control circuit, so the implementation of the monitoring device can be referred to the implementation of the current control circuit, and repeated parts are not described herein again.
The monitoring device in the embodiment of the present invention may be a camera, the camera further includes a camera, and the light emitting unit 70 may be an LED disposed around the camera.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A current control circuit applied to a monitoring device, comprising:
a processor;
the sampling unit is connected with the output end and the grounding end of the light-emitting unit and is used for sampling the voltage of the output end of the light-emitting unit;
the driving unit is connected with the processor, the sampling unit and the input end of the light-emitting unit, and is used for generating driving current for driving the light-emitting unit to emit light according to the received pulse signal sent by the processor and the received first input voltage and acquiring sampling voltage of the output end of the light-emitting unit;
and the current control unit is connected with the processor and the output end of the light-emitting unit and used for reducing the driving current according to the received first control signal sent by the processor.
2. The circuit of claim 1, wherein a first input terminal of the driving unit is connected to a first voltage terminal, a second input terminal of the driving unit is connected to a first output terminal of the processor, a sampling terminal of the driving unit is connected to a first terminal of the sampling unit, and an output terminal of the driving unit is connected to an input terminal of the light emitting unit;
the second end of the sampling unit is grounded;
the first input end of the current control unit is connected with the second voltage end, the second input end of the current control unit is connected with the second output end of the processor, and the output end of the current control unit is connected with the output end of the light-emitting unit;
the first voltage end is used for outputting the first input voltage, and the second voltage end is used for outputting the second input voltage.
3. The circuit of claim 2, wherein the current control unit is specifically configured to:
according to the first control signal, a path between a first input end of the current control unit and an output end of the current control unit is conducted;
and according to a second control signal sent by the processor, disconnecting a path between the first input end of the current control unit and the output end of the current control unit.
4. The circuit of claim 3, wherein the current control unit comprises a transistor and a first resistor;
a first end of the transistor is used as a first input end of the current control unit, a second end of the transistor is connected with a first end of the first resistor, and a control end of the transistor is used as a second input end of the current control unit;
and the second end of the first resistor is used as the output end of the current control unit.
5. The circuit of claim 1, wherein the sampling cell comprises a second resistor;
the first end of the second resistor is connected with the output end of the light-emitting unit, and the second end of the second resistor is grounded.
6. The circuit of claim 2, wherein the circuit further comprises a third resistor;
the third resistor is connected between the sampling pin of the driving unit and the output end of the light-emitting unit.
7. The circuit of claim 2, further comprising a first filtering unit and a second filtering unit;
the first filtering unit is respectively connected with the output end of the driving unit, the input end of the light-emitting unit and the grounding end and is used for filtering the voltage signal output by the driving unit;
the second filtering unit is connected with the first input end and the grounding end of the driving unit and is used for filtering the first input voltage.
8. The circuit of claim 7, wherein the first filtering unit comprises an inductor and a first capacitor;
the first end of the inductor is connected with the output end of the driving unit, and the second end of the inductor is connected with the first end of the first capacitor and the input end of the light-emitting unit;
the second end of the capacitor is grounded.
9. The circuit of claim 7, wherein the second filtering unit comprises a second capacitor;
the first end of the second capacitor is connected with the first input end of the driving unit, and the second end of the second capacitor is grounded.
10. A monitoring device comprising a light emitting unit and a current control circuit according to any one of claims 1 to 9.
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