CN102006699B - Police photo-taking light circuit - Google Patents
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- CN102006699B CN102006699B CN200910189852.9A CN200910189852A CN102006699B CN 102006699 B CN102006699 B CN 102006699B CN 200910189852 A CN200910189852 A CN 200910189852A CN 102006699 B CN102006699 B CN 102006699B
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Abstract
The invention relates to a police photo-taking light circuit. The police photo-taking light circuit comprises an interface port used for connecting a power supply, and a control circuit used for controlling an output port and used for controlling the power supply to supply power to a photo-taking light, wherein the control circuit is a singlechip control circuit; a switching circuit is also arranged between the power supply and the singlechip control circuit and is used for connecting or disconnecting power supply to the singlechip control circuit by the power supply; the switching circuit comprises a plurality of switches connected in parallel between the interface port of the power supply and the singlechip control circuit, and a plurality of protective resistors; and one end of each switch is connected with the interface port of the power supply and the other end is connected to a control pin of a singlechip in the singlechip control circuit respectively and is also grounded through a protective resistor to control the corresponding pin of the singlechip in a low-level state. The police photo-taking light circuit guarantees that the corresponding pin in the singlechip control circuit is in the low-level state and improves the reliability of the circuit.
Description
Technical Field
The invention relates to a photographic lamp circuit, in particular to a photographic lamp circuit for police.
Background
The police photographic lamp is matched with a camera for use and is used for taking fingerprint prints on a scene of a crime. The police camera lamp is provided with a plurality of light sources which have different colors and can emit different light wave frequency bands, and when fingerprint prints are shot, the light sources with different colors and different light wave frequency bands are adopted for irradiation according to shooting environments, so that the best fingerprint print images are obtained. However, the current stability of the existing police photographing lamp circuit is poor, when the power supply current fluctuates, the light frequency and the brightness of the light source will be unstable, which affects the photographing of fingerprint prints, and the obtained images are often unclear, which directly affects the case detection. Therefore, improvements in police camera light circuits are needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a circuit of a police photographing lamp aiming at the defects of poor current stability, influence on image photographing effect and the like of the police photographing lamp in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a police photographing lamp circuit, which comprises: the control circuit is a single chip microcomputer control circuit, and a switch circuit is arranged between the power supply and the single chip microcomputer control circuit and used for switching on or off the power supply to the single chip microcomputer control circuit; the switch circuit comprises a plurality of switches and a plurality of protective resistors, wherein the switches are connected in parallel between an interface end of the power supply and the single chip microcomputer control circuit;
and a power supply protection circuit is connected between the interface end of the power supply and the switch circuit, and comprises two protection chips for voltage sampling so as to control the input voltage to be between 3V-4.25V.
In the police photographing lamp circuit, the method further comprises: and the ISP burner is connected with the singlechip control circuit and is used for writing a control function into the singlechip control circuit.
In the police photographing lamp circuit, the power supply protection circuit comprises a protection chip U2 with the model of S-8261 ABPMDM-G3 PT2 and a protection chip U3 with the model of SSG5N20V, and an interface end of the power supply comprises a positive electrode BAT + of a power supply input end and a negative electrode BAT-; pin 5 of the protection chip U2 is connected with the positive electrode BAT + of the power input end through a resistor R9 to form a voltage sampling circuit, and the pin 5 is connected with the negative electrode BAT-of the power input end through a capacitor C10; pin 6 of the protection chip U2 is connected to the negative electrode BAT-of the power input end; pin 2 of the protection chip U3 is connected to the negative electrode BAT-of the power input terminal, and when the power input voltage exceeds 4.25 volts or is less than 3 volts, the power protection circuit compares the voltage intercepted by the voltage sampling circuit to stabilize the input voltage.
In the police photographing lamp circuit, a charging serial port is further arranged at the input end of the power supply protection circuit, wherein the anode of the charging serial port is connected with the anode of a diode, and the cathode of the diode is connected with the anode of a power supply; and the negative electrode of the charging serial port is respectively connected with the two protection chips.
In the police photographing lamp circuit, a voltage output circuit is connected between the single chip microcomputer control circuit and a control output port for controlling the working of the photographing lamp, the voltage output circuit comprises a plurality of voltage output branches, the input end of each voltage output branch is connected with one control output pin of the single chip microcomputer in the single chip microcomputer control circuit, and the output end of each voltage output branch is connected to one port of the control output ports for controlling the working of the photographing lamp so as to respectively supply power to the lamps with various colors in the photographing lamp.
In the police photographing lamp circuit, each voltage output branch comprises: the device comprises a voltage division resistance unit, a switch tube and an output resistance unit which are sequentially connected in series between a single chip microcomputer control circuit and a control output port for controlling the working of a photographic lamp, wherein the voltage division resistance unit is used for controlling the large threshold voltage of the switch tube.
In the police photographing lamp circuit, the voltage dividing resistor unit comprises a voltage sampling circuit formed by connecting at least two resistors in series, one end of the voltage sampling circuit is connected with one control output pin of a singlechip in the singlechip control circuit, the other end of the voltage sampling circuit is grounded, and a sampling voltage output end of the voltage sampling circuit is connected with a grid electrode of the switch tube and is used for controlling the threshold voltage of the switch tube; the source electrode of the switch tube is grounded; the drain electrode of the switch tube is connected with one end of the output resistance unit, and the other end of the output resistance unit is connected with one of control output ports for controlling the working of the photographic lamp; the output resistance unit includes a circuit unit formed by connecting a plurality of resistors in parallel.
In the police photographing lamp circuit, the output resistance unit comprises a circuit unit formed by connecting 5-9 resistors in parallel.
In the police photographing lamp circuit, a singlechip U1 with the model number of ATTINY2313 is adopted in a singlechip control circuit, and voltage output pins 12, 13, 14 and 15 of the singlechip U1 are respectively connected with one voltage output branch in the voltage output circuit; in the switch circuit, pins 9, 7, 5 and 3 of the singlechip U1 are respectively connected with one end of a switch, a joint of the pin of the singlechip U1 and the switch is grounded through a protection resistor, and when the switch is disconnected and the voltage of the pins 3, 5, 7 and 9 of the singlechip U1 is in a high-voltage state, the high voltage of the pins 3, 5, 7 and 9 of the singlechip U1 is led into a ground wire through the protection resistor.
The police photographing lamp circuit has the following beneficial effects: the protection branch circuit is additionally arranged in the switch circuit, so that the corresponding pins in the singlechip control circuit can be ensured to be in a low-voltage state, and the reliability of the circuit is improved; the invention provides a police photographing lamp circuit with a constant current function, which can solve the problem of unstable current; in addition, the invention can be convenient for burning the control program by additionally arranging the ISP burner.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic block diagram of the circuit of the police photography lamp of the present invention;
fig. 2 is a circuit schematic diagram of an embodiment of the police photography light circuit shown in fig. 1.
Detailed Description
As shown in fig. 1 and 2, in an embodiment of the police photographing lamp circuit of the present invention, the police photographing lamp circuit includes: the intelligent control circuit is characterized in that the control circuit can be a single chip microcomputer control circuit 401, so that different peripheral circuits can be added to the control circuit through different pins, the intelligent effect of the police photographing lamp circuit is enhanced, and a switch circuit 100 is arranged between the interface end of the power supply and the single chip microcomputer control circuit 401 and used for controlling the on-off effect of the switch circuit 100, so that the power supply of the power supply to the single chip microcomputer control circuit 401 is further controlled; in addition, the single chip microcomputer control circuit 401 is also connected with an ISP burner 300 for writing a control function to the single chip microcomputer control circuit 401. The interface end of the power supply is used to draw power from the power supply. The control output port for controlling the operation of the photographic lamp here comprises a plurality of control input terminals of the LED lamps and a power supply positive input terminal, such as an interface J1 in FIG. 2, wherein LEDV + of the interface J1 is connected with the positive power supply input terminal of the interface terminals of the power supply.
Further, as shown in fig. 2, in operation, the ISP burner 300 burns a lamp control function program to the mcu U1, for example, a chip J2 with a model number of ISP6 may be adopted, pins 1, 2, 3, 4, and 5 of the ISP burner are respectively connected to pins 18, 20, 19, 17, and 1 of the mcu U1, and pin 6 is grounded.
Further, as shown in fig. 2, the mcu 401 may be implemented by a multi-bit mcu, such as an atm 2313 mcu, to control the power supply of the camera.
Furthermore, the switch circuit 100 may include a plurality of switches connected in parallel between the interface of the power supply and the mcu control circuit, and a plurality of protection resistors, wherein one end of each switch is connected to the interface of the power supply, the other end of each switch is connected to a control pin of the mcu control circuit, and the other end of each switch is grounded through a protection resistor to control the corresponding pin of the mcu to be in a low level state. As shown in fig. 2, the switch circuit 100 includes four switches S1, S2, S3, and S4, and four resistors R1, R2, R3, and R4. Although a circuit form adopting four dial switches is shown in fig. 2, the protection of the present invention is not limited to a circuit structure form of four switches. 4 resistors R1, R2, R3, and R4 are provided in the switch circuit 100 as pull-down resistors; the power supply output ends of 4 parallel switches S1, S2, S3 and S4 of the switch circuit 100 are respectively connected with pins 3, 5, 7 and 9 of a singlechip U1 in the singlechip control circuit 401, connection points are respectively connected with one ends of resistors R1, R2, R3 and R4, and the other ends of resistors R1, R2, R3 and R4 are grounded after being connected in parallel; the protection resistors R1, R2, R3 and R4 are used for ensuring the voltage of the pins 3, 5, 7 and 9 of the singlechip control circuit U1, and ensuring that the pins are always maintained in a low voltage state. The realization principle is as follows: when the switches S1, S2, S3 and S4 are disconnected and the voltages of the pins 3, 5, 7 and 9 of the singlechip control circuit U1 are in a high-voltage state, the voltages are introduced into the ground line through the respectively connected protective resistors, so that the voltages of the pins 3, 5, 7 and 9 of the singlechip control circuit U1 are reduced, and the reliability of the circuit is improved.
Furthermore, a power protection circuit 200 is connected between the interface terminal of the power supply and the switch circuit 100, and the power protection circuit 200 includes two protection chips U2 and U3 for voltage sampling, so as to control the input voltage to be 3V-4.25V. The interface of the power supply here comprises a positive power input terminal BAT + and a negative power input terminal BAT-. The protection chip U2 can adopt a chip with the model number S-8261 ABPMDM-G3 PT2, and the protection chip U3 can adopt a chip with the model number SSG5N 20V; pin 5 of the protection chip U2 is connected with the positive electrode BAT + of the power input end through a resistor R9 to form a voltage sampling circuit, and the pin 5 is connected with the negative electrode BAT-of the power input end through a capacitor C10; pin 6 of the protection chip U2 is connected to the negative electrode BAT-of the power input end; pin 2 of the protection chip U3 is connected to the negative terminal BAT of the power input terminal. Thus, when the power input voltage exceeds 4.25 volts or is less than 3 volts, the power protection circuit 200 compares the voltages intercepted by its voltage sampling circuit to stabilize the input voltage.
As shown in fig. 2, the input end of the power protection circuit 200 is further provided with a charging serial port CHARGE, wherein an anode CHARGE + of the charging serial port is connected to an anode of a diode D1, a cathode of the diode D1 is connected to an anode input end of the power supply, so as to prevent current from flowing backward in the reverse direction, and in order to avoid interference of high-frequency noise and the like, the anode CHARGE + of the charging serial port is further grounded through a capacitor C5; the negative electrode CHARGE-of the charging serial port is respectively connected with the protection chip U2 and the protection chip U3. Taking the circuit shown in fig. 2 as an example, the negative CHARGE-of the charging serial port is connected to pin 6 of the protection chip U3, and is simultaneously connected to pin 2 of the protection chip U2 through the resistor R10; pin 1 of the protection chip U3 is connected with pin 4 of the protection chip U2, pin 3 of the protection chip U3 is connected with pin 5 of the protection chip U2, and the protection of the power supply is realized by using the protection chip U2 and the protection chip U3.
Further, a voltage output circuit 400 is connected between the single chip microcomputer control circuit and a control output port (such as an interface J1 in fig. 2) for controlling the operation of the photographic lamp, the voltage output circuit 400 includes a plurality of voltage output branches connected between the single chip microcomputer control circuit and the control output port for controlling the operation of the photographic lamp, an input terminal of each voltage output branch is connected to one control output pin of the single chip microcomputer in the single chip microcomputer control circuit, and an output terminal of each voltage output branch is connected to one of the control output ports for controlling the operation of the photographic lamp, so as to respectively supply power to lamps of various colors such as a red lamp, a green lamp, a blue lamp, a white lamp and the like in the photographic lamp. Each of the voltage output branches includes: the voltage-dividing resistor unit, the switch tube and the output resistor unit are sequentially connected in series between the single chip microcomputer control circuit 401 and a control output port for controlling the working of the photographic lamp, wherein the voltage-dividing resistor unit is used for controlling the large threshold voltage of the switch tube. The voltage dividing resistance unit comprises a voltage sampling circuit formed by connecting at least two resistors in series, one end of the voltage sampling circuit is connected with one control output pin of the singlechip in the singlechip control circuit 401, the other end of the voltage sampling circuit is grounded, and a sampling voltage output end of the voltage sampling circuit is connected with a grid electrode of the switching tube and is used for controlling the threshold voltage of the switching tube; the source electrode of the switch tube is grounded, the drain electrode of the switch tube is connected with one end of the output resistance unit, the other end of the output resistance unit is connected with one of control output ports for controlling the operation of the photographic lamp, and the output resistance unit comprises a circuit unit formed by connecting a plurality of resistors in parallel and used for controlling the rated power of the output within a required range. The output resistance unit can be formed by connecting 5-9 resistors in parallel, and the output rated power is ensured to be 0.1W; but the number of resistors can be flexibly adjusted according to specific situations. The connection relationship between the single chip control circuit 401 and the voltage output circuit 400 is described in detail below with respect to the specific embodiment shown in fig. 2.
A singlechip U1 with the model number of ATTINY2313 is adopted in the singlechip control circuit 401, and voltage output pins 12, 13, 14 and 15 of the singlechip U1 are respectively and correspondingly connected with one voltage output branch in the voltage output circuit, namely resistors R5, R6, R7 and R8 are respectively positioned in the voltage output branch to which the resistors belong; for example, the voltage output branch to which the resistor R5 belongs includes a voltage sampling circuit composed of two voltage dividing resistors R5 and R50, a MOS transistor Q1 functioning as a switch, and an output resistor composed of resistors R51 to R59; the voltage dividing resistors R5 and R50 are used for controlling the gate threshold voltage of the MOS transistor Q1; one end of a voltage dividing resistor R5 is connected with a pin 12 of the singlechip control circuit U1, the other end of the voltage dividing resistor R5 is connected with the grid of the MOS transistor Q1, the voltage dividing resistor R50 is connected between the grid and the source of the MOS transistor Q1 in parallel, and the connection point of the voltage dividing resistor R50 and the source of the MOS transistor Q1 is grounded; the output resistor consists of 9 same resistors (R51-R59) and ensures that the output rated power is 0.1W; one end of the output resistor is connected with the drain of the MOS transistor Q1, and the other end is connected with a load. The voltage output branches of the other branches are similar.
The power protection circuit 200 is arranged at the power input end and plays a role in protecting the power, and because the police camera lamp related to the invention can be powered by a battery, a charging serial port is designed for charging the battery by using a power supply, and when the power supply is not available, the battery can be used for supplying power. The protection circuit 200 is mainly composed of the protection chips U2 and U3; a pin 5 of the protection chip U2 is connected with the anode of the power input end through a resistor R9 to form a voltage sampling circuit, and the pin 5 is connected with the cathode of the power input end through a capacitor C10; a pin 6 of the protection chip U2 is connected to the negative electrode of the power input end; pin 2 of the protection chip U2 is connected to the negative pole of the power input terminal. Thus, when the input voltage of the power supply exceeds 4.25 volts or is less than 3 volts, the protection circuit 100 compares the voltages intercepted by the voltage sampling circuit thereof, and controls the voltage range to play the roles of protection and current limitation.
The present invention is illustrated by several specific embodiments, and fig. 2 is only provided for the circuit under the condition of four LED lamps, and it should be understood by those skilled in the art that various changes and equivalent substitutions may be made without departing from the scope of the present invention, for example, increasing the number or kinds of the controlled LED lamps, and correspondingly increasing the switch branch in the on-off circuit and the voltage output branch in the voltage output circuit. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (9)
1. A police camera lamp circuit comprising: the control circuit is characterized in that the control circuit is a single chip microcomputer control circuit, and a switch circuit is arranged between the power supply and the single chip microcomputer control circuit and used for switching on or off the power supply to the single chip microcomputer control circuit; wherein,
the switch circuit comprises a plurality of switches and a plurality of protective resistors, wherein the switches and the protective resistors are connected in parallel between an interface end of the power supply and the single chip microcomputer control circuit;
and a power supply protection circuit is connected between the interface end of the power supply and the switch circuit, and comprises two protection chips for voltage sampling so as to control the input voltage to be between 3V-4.25V.
2. The police photography light circuit of claim 1, further comprising: and the ISP burner is connected with the singlechip control circuit and is used for writing a control function into the singlechip control circuit.
3. The police photographing lamp circuit according to claim 1, wherein the power protection circuit comprises a protection chip U2 with the model number S-8261 ABPMDM-G3 PT2 and a protection chip U3 with the model number SSG5N20V, and an interface end of the power supply comprises a positive power input terminal BAT + and a negative power input terminal BAT-; pin 5 of the protection chip U2 is connected with the positive electrode BAT + of the power input end through a resistor R9 to form a voltage sampling circuit, and the pin 5 is connected with the negative electrode BAT-of the power input end through a capacitor C10; pin 6 of the protection chip U2 is connected to the negative electrode BAT-of the power input end; pin 2 of the protection chip U3 is connected to the negative electrode BAT-of the power input terminal, and when the power input voltage exceeds 4.25 volts or is less than 3 volts, the power protection circuit compares the voltage intercepted by the voltage sampling circuit to stabilize the input voltage.
4. The police photographing lamp circuit according to claim 1, wherein a charging serial port is further arranged at an input end of the power supply protection circuit, wherein an anode of the charging serial port is connected with an anode of a diode, and a cathode of the diode is connected with an anode input end of a power supply; and the negative electrode of the charging serial port is respectively connected with the two protection chips.
5. The police photography light circuit according to claim 1, wherein a voltage output circuit is connected between the singlechip control circuit and a control output port for controlling the operation of the photography light, the voltage output circuit comprises a plurality of voltage output branches, an input end of each voltage output branch is connected with a control output pin of a singlechip in the singlechip control circuit, and an output end of each voltage output branch is connected with one of the control output ports for controlling the operation of the photography light so as to respectively supply power to the lamps of various colors in the photography light.
6. The police photography light circuit of claim 5, wherein each voltage output branch comprises: the device comprises a voltage division resistance unit, a switch tube and an output resistance unit which are sequentially connected in series between a single chip microcomputer control circuit and a control output port for controlling the working of a photographic lamp, wherein the voltage division resistance unit is used for controlling the large threshold voltage of the switch tube.
7. The police photographing lamp circuit according to claim 6, wherein the voltage dividing resistor unit comprises a voltage sampling circuit formed by connecting at least two resistors in series, one end of the voltage sampling circuit is connected with one control output pin of a singlechip in the singlechip control circuit, the other end of the voltage sampling circuit is grounded, and a sampling voltage output end of the voltage sampling circuit is connected with a grid electrode of the switching tube and is used for controlling the threshold voltage of the switching tube; the source electrode of the switch tube is grounded; the drain electrode of the switch tube is connected with one end of the output resistance unit, and the other end of the output resistance unit is connected with one of control output ports for controlling the working of the photographic lamp; the output resistance unit includes a circuit unit formed by connecting a plurality of resistors in parallel.
8. The police photographing lamp circuit according to claim 7, wherein the output resistor unit comprises a circuit unit formed by connecting 5-9 resistors in parallel.
9. The police photographing lamp circuit according to claim 5, wherein a single chip microcomputer U1 with the model number ATTINY2313 is adopted in the single chip microcomputer control circuit, and voltage output pins 12, 13, 14 and 15 of the single chip microcomputer U1 are respectively connected with one voltage output branch in the voltage output circuit; in the switch circuit, pins 9, 7, 5 and 3 of the singlechip U1 are respectively connected with one end of a switch, a joint of the pin of the singlechip U1 and the switch is grounded through a protection resistor, and when the switch is disconnected and the voltage of the pins 3, 5, 7 and 9 of the singlechip U1 is in a high-voltage state, the high voltage of the pins 3, 5, 7 and 9 of the singlechip U1 is led into a ground wire through the protection resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910189852.9A CN102006699B (en) | 2009-09-02 | 2009-09-02 | Police photo-taking light circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910189852.9A CN102006699B (en) | 2009-09-02 | 2009-09-02 | Police photo-taking light circuit |
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| Publication Number | Publication Date |
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| CN102006699A CN102006699A (en) | 2011-04-06 |
| CN102006699B true CN102006699B (en) | 2013-04-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| MY185127A (en) * | 2013-04-19 | 2021-04-30 | Shindengen Electric Mfg | Lamp driving power supply and a method of controlling lamp driving power supply |
| CN104159358A (en) * | 2014-06-30 | 2014-11-19 | 青岛海信移动通信技术股份有限公司 | Electric torch drive circuit and mobile terminal |
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| CN2785304Y (en) * | 2005-04-11 | 2006-05-31 | 陈康周 | Multi-function changing lamp |
| US20080191642A1 (en) * | 2005-04-08 | 2008-08-14 | Wart Hog Ii Holding B.V. | Methods and Apparatus for Operating Groups of High-Power Leds |
| CN101305642A (en) * | 2005-11-08 | 2008-11-12 | 皇家飞利浦电子股份有限公司 | Circuit arrangement and method of driving a circuit arrangement |
| WO2009013675A1 (en) * | 2007-07-23 | 2009-01-29 | Nxp B.V. | Self-powered led bypass-switch configuration |
| US20090204239A1 (en) * | 2007-10-29 | 2009-08-13 | Netzel Sr Robert J | LED Light Controller System and Method |
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2009
- 2009-09-02 CN CN200910189852.9A patent/CN102006699B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080191642A1 (en) * | 2005-04-08 | 2008-08-14 | Wart Hog Ii Holding B.V. | Methods and Apparatus for Operating Groups of High-Power Leds |
| CN2785304Y (en) * | 2005-04-11 | 2006-05-31 | 陈康周 | Multi-function changing lamp |
| CN101305642A (en) * | 2005-11-08 | 2008-11-12 | 皇家飞利浦电子股份有限公司 | Circuit arrangement and method of driving a circuit arrangement |
| WO2009013675A1 (en) * | 2007-07-23 | 2009-01-29 | Nxp B.V. | Self-powered led bypass-switch configuration |
| US20090204239A1 (en) * | 2007-10-29 | 2009-08-13 | Netzel Sr Robert J | LED Light Controller System and Method |
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