High current voltage regulator circuit module for illegal capture imaging system
By designing a high-current voltage-regulating circuit module in the highway capture image system, using components such as electrolytic capacitors, voltage-regulating diodes and MOSFETs to achieve constant current and constant voltage power supply and briefly cut off the power supply during capture, the equipment caused by excessive current is solved. The damage problem has improved the quality of the capture and equipment life.
Patent Information
- Application Number
- CN201711087105.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2017-11-08
- Publication Date
- 2024-12-27
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
When the highway camera capture image system uses ordinary DC power, the current of the camera and fill light at the moment of capture is too high, resulting in a sharp drop in the voltage, causing large image noise, possible failure, and easy to damage the equipment.
A large current voltage-regulating circuit module for illegally captured images was designed, and the electrolytic capacitor, voltage-regulating diode, MOSFET, transistor and voltage comparator chip was used to realize constant current and constant voltage power supply, and the power supply was temporarily cut off during capture to protect it. equipment.
It ensures the quality of capture, significantly improves the service life of the equipment and the reliability of the system, and reduces the failure and maintenance rate.
Smart Images
Figure CN107769558B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a high-current voltage-stabilizing circuit module of a traffic violation capturing imaging system. Background Art
[0002] At present, there are two main power supply modes for highway snapshot imaging systems, one is 220VAC direct power supply, and the other is 24VDC power supply. However, both will eventually convert AC power into DC power to power the camera and fill light. The former performs AC-DC conversion inside the camera, and the latter uses an independent DC power supply to power the system. Obviously, the latter is more reliable and has a lower failure rate. Because the snapshot imaging system has a big feature, the current is very small when the camera is on standby, less than 1A, and 3A-6A when continuously shooting. When using the fill light to capture, the instantaneous current may reach 14A. When using an ordinary DC power supply, the current is too large at the moment of capturing, and the voltage will drop sharply, which will eventually lead to excessive noise in the captured picture, the picture will appear black, or even the capture will fail completely, and it is easy to damage the DC power supply or camera system. Summary of the invention
[0003] In order to solve the above problems, the present invention provides a high-current voltage-stabilizing circuit module for a traffic violation capture imaging system. The module can be in a constant-current and constant-voltage power supply state when the capture imaging system is on standby or shooting; the power supply is temporarily cut off and the flash is turned off when the flash is brightest immediately after the capture, thereby completing the shooting task and protecting the power supply and the capture imaging device, thereby avoiding damage due to continuous high current. Therefore, the capture quality of the traffic violation capture imaging system is greatly guaranteed, the service life of the capture imaging system is significantly improved, and the failure and maintenance rate is greatly reduced.
[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: it includes an electrolytic capacitor C1, a Zener diode VZD1, a Zener diode VZD2, a P-channel MOSFETQ1, an NPN-type triode transistor Q2, a PNP-type triode transistor Q3, an NPN-type triode transistor Q4, a voltage comparator chip LM293U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, and a resistor R7. The +24 volt voltage output by the front-stage switching power supply passes through the resistor R2 (3) and the voltage-stabilizing diode VZD2 (15) to provide a -9 volt turn-on voltage to the gate and source of the P-channel MOSFET Q1 (4); the +24 volt voltage passes through the resistor R1 (1) to limit the current and provide a 24 mA drive current to the voltage-stabilizing diode VZD1 (14), so that the voltage of the voltage-stabilizing diode VZD1 (14) is stabilized at 2.7 volts; the capacitor C1 (2) filters out high-frequency noise from the gate and source of the MOSFET Q1 (4); the resistor R 3 (5), the voltage sampling signal at the connection of resistor R4 (11), the voltage sampling signal is input to pin 2 of the voltage comparator U1 (10), pin 3 of the voltage comparator U1 (10) is connected to the +5 volt reference voltage, its pin 8 is connected to the +5 volt power supply voltage, and its pin 4 is grounded. When the voltage output to the camera and the fill light is greater than 22.3 volts, pin 1 of the voltage comparator U1 (10) can output a low level, causing the triode transistor Q2 (9) to be cut off, which can make the MOSFETQ1 (4) in a normal conduction power supply state, for the camera The camera and fill light provide stable voltage and constant current; when the voltage output to the camera and fill light is equal to or less than 22.3 volts, the voltage comparator U1 (10) pin 1 can output a high level, causing the triode transistor Q2 (9) to be turned on, which can make a -20 volt strong conduction voltage between the gate and source of MOSFETQ1 (4), so that MOSFETQ1 (4) can be in a fully turned-on state with high current supply, providing high current to the camera and fill light while stabilizing the voltage at +24 volts; resistors R5 (7) and R6 (6) and resistors R7 (8) form a current sampling module. The sampling voltage at the connection point of resistors R6 (6) and R7 (8) is transmitted to the base of the triode transistor Q4 (13). If the current flowing through resistor R5 (7) is greater than 14A, the triode transistor Q4 (13) and the triode transistor Q3 (12) can be turned on, causing the gate and source voltage of MOSFETQ1 (4) to drop to 0.3V, so that MOSFETQ1 (4) is turned off, preventing the continuous large current from burning MOSFETQ1 (4), the camera, and the fill light.
[0005] Furthermore, the base of the triode transistor Q2 (9) is connected to pin 1 of U1 (10); the collector of the triode transistor Q2 (9) is connected to the lower end of the capacitor C1 (2), the lower end of the resistor R2 (3), the upper end of the voltage-stabilizing diode VZD2 (15), the gate of the P-channel MOSFET Q1 (4), and the collector of the triode transistor Q3 (12); the emitter of the triode transistor Q2 (9) is connected to the lower end of the resistor R1 (1) and the upper end of the voltage-stabilizing diode VZD1 (14); the source of the P-channel MOSFET Q1 (4) is connected to the upper end of the resistor R1 (1), the upper end of the capacitor C1 (2), the upper end of the resistor R2 (3), the emitter of the triode transistor Q3 (12), and the DC 24V input terminal; the drain of the P-channel MOSFET Q1 (4) is connected to the upper end of the resistor R3 (5), the gate of the resistor R3 (6), and the collector of the triode transistor Q3 (12); the emitter of the triode transistor Q2 (9) is connected to the lower end of the resistor R1 (1) and the upper end of the voltage-stabilizing diode VZD1 (14); the source of the P-channel MOSFET Q1 (4) is connected to the upper end of the resistor R1 (1), the upper end of the capacitor C1 (2), the upper end of the resistor R2 (3), the emitter of the triode transistor Q3 (12), and the DC 24V input terminal. The left end of resistor R5 (7) and the left end of resistor R6 (6); pin 4 of the voltage comparator chip LM293U1 (10) is grounded, pin 8 is connected to +5V voltage, pin 3 is connected to +5V voltage, and pin 2 is connected to the lower end of resistor R3 (5) and the upper end of resistor R4 (11); the base of the triode transistor Q3 (12) is connected to the collector of the triode transistor Q4 (13); the emitter of the triode transistor Q4 (13) is grounded; the base of the triode transistor Q4 (13) is connected to the right end of resistor R6 (6) and the left end of resistor R7 (8); the right end of the resistor R5 (7) is connected to the right end of resistor R7 (8) and the snapshot camera and fill light; the lower end of the resistor R4 (11) is grounded; the lower end of the voltage regulator diode VZD1 (14) is grounded; the lower end of the voltage regulator diode VZD2 (15) is grounded.
[0006] The model of the triode transistor Q2 (9) and the triode transistor Q4 (13) is SS8050.
[0007] The model of the triode transistor Q3 (12) is SS8550.
[0008] The model of the P-channel MOSFET Q1 (4) is IRF4435.
[0009] The model of the voltage zener diode VZD1 (14) is 1N5986B.
[0010] The model of the voltage zener diode VZD2 (15) is 1N4744A.
[0011] The model of the voltage comparator chip U1 (10) is LM293.
[0012] The present invention has the following beneficial effects: when used in a DC power supply system for traffic violation capture imaging, the power supply voltage of the camera and fill light system can be stabilized at 23 volts to 24 volts, while stably providing a working current of 500mA to 8A, thereby effectively ensuring that the camera capture system can work stably and take high-quality pictures, while effectively preventing the system or power supply from being damaged by a large current at the moment of capture, thereby greatly improving the capture effect and reducing the equipment maintenance rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0014] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION
[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0016] like Figure 1As shown, the high current voltage stabilizing circuit module of the traffic violation capture imaging system includes an electrolytic capacitor C1 (2), a voltage stabilizing diode VZD1 (14), a voltage stabilizing diode VZD2 (15), a P-channel MOSFET Q1 (4), an NPN triode transistor Q2 (9), a PNP triode transistor Q3 (12), an NPN triode transistor Q4 (13), a voltage comparator chip LM293U1 (10), a resistor R1 (1), a resistor R2 (3), a resistor R3 (5), a resistor R4 (11), a resistor R5 (7), a resistor R6 (6), and a resistor R7 (8). The base of the triode transistor Q2 (9) is connected to pin 1 of U1 (10); the collector of the triode transistor Q2 (9) is connected to the lower end of the capacitor C1 (2), the lower end of the resistor R2 (3), the upper end of the voltage-stabilizing diode VZD2 (15), the gate of the P-channel MOSFET Q1 (4), and the collector of the triode transistor Q3 (12); the emitter of the triode transistor Q2 (9) is connected to the lower end of the resistor R1 (1) and the upper end of the voltage-stabilizing diode VZD1 (14); the source of the P-channel MOSFET Q1 (4) is connected to the upper end of the resistor R1 (1), the upper end of the capacitor C1 (2), the upper end of the resistor R2 (3), the emitter of the triode transistor Q3 (12), and the DC 24V input terminal; the drain of the P-channel MOSFET Q1 (4) is connected to the upper end of the resistor R3 (5), the resistor R 5 (7) left end, and the left end of resistor R6 (6); pin 4 of the voltage comparator chip LM293U1 (10) is grounded, pin 8 is connected to +5V voltage, pin 3 is connected to +5V voltage, and pin 2 is connected to the lower end of resistor R3 (5) and the upper end of resistor R4 (11); the base of the triode transistor Q3 (12) is connected to the collector of the triode transistor Q4 (13); the emitter of the triode transistor Q4 (13) is grounded; the base of the triode transistor Q4 (13) is connected to the right end of resistor R6 (6) and the left end of resistor R7 (8); the right end of the resistor R5 (7) is connected to the right end of the resistor R7 (8) and the snapshot camera and fill light; the lower end of the resistor R4 (11) is grounded; the lower end of the voltage regulator diode VZD1 (14) is grounded; the lower end of the voltage regulator diode VZD2 (15) is grounded. The models of the triode transistors Q2 (9) and Q4 (13) are SS8050. The model of the triode transistor Q3 (12) is SS8550.
[0017] The model of the P-channel MOSFET Q1 (4) is IRF4435. The model of the voltage regulator diode VZD1 (14) is 1N5986B. The model of the voltage regulator diode VZD2 (15) is 1N4744A. The model of the voltage comparator chip U1 (10) is LM293.
[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A high current voltage stabilizing circuit module for a traffic violation capture imaging system, characterized in that: The invention comprises an electrolytic capacitor C1 (2), a voltage zener diode VZD1 (14), a voltage zener diode VZD2 (15), a P-channel MOSFET Q1 (4), an NPN-type triode transistor Q2 (9), a PNP-type triode transistor Q3 (12), an NPN-type triode transistor Q4 (13), a voltage comparator chip LM293U1 (10), a resistor R1 (1), a resistor R2 (3), a resistor R3 (5), a resistor R4 (11), a resistor R5 (7), a resistor R6 (6), and a resistor R7 (8); the base of the triode transistor Q2 (9) is connected to a pin of the voltage comparator chip LM293U1 (10). 1; the collector of the triode transistor Q2 (9) is connected to the lower end of the capacitor C1 (2), the lower end of the resistor R2 (3), the upper end of the voltage-stabilizing diode VZD2 (15), the gate of the P-channel MOSFET Q1 (4), and the collector of the triode transistor Q3 (12); the emitter of the triode transistor Q2 (9) is connected to the lower end of the resistor R1 (1) and the upper end of the voltage-stabilizing diode VZD1 (14); the source of the P-channel MOSFET Q1 (4) is connected to the upper end of the resistor R1 (1), the upper end of the capacitor C1 (2), the upper end of the resistor R2 (3), the emitter of the triode transistor Q3 (12), and the DC 24V input terminal; the P-channel MOSFET The drain of ETQ1 (4) is connected to the upper end of resistor R3 (5), the left end of resistor R5 (7), and the left end of resistor R6 (6); pin 4 of the voltage comparator chip LM293U1 (10) is grounded, pin 8 is connected to +5V voltage, pin 3 is connected to +5V voltage, and pin 2 is connected to the lower end of resistor R3 (5) and the upper end of resistor R4 (11); the base of the triode transistor Q3 (12) is connected to the collector of the triode transistor Q4 (13); the emitter of the triode transistor Q4 (13) is grounded; the base of the triode transistor Q4 (13) is connected to the right end of resistor R6 (6) and the left end of resistor R7 (8); the right end of the resistor R5 (7) is connected to the resistor R7 (8) right end and snapshot camera and fill light; the lower end of the resistor R4 (11) is grounded; the lower end of the voltage regulator diode VZD1 (14) is grounded; the lower end of the voltage regulator diode VZD2 (15) is grounded; the front-stage switching power supply outputs a +24 volt voltage, which, through the resistor R2 (3) and the voltage regulator diode VZD2 (15), can provide a -9 volt turn-on voltage for the gate and source of the P-channel MOSFET Q1 (4); the +24 volt voltage is limited by the resistor R1 (1) and can provide a 24 mA driving current to the voltage regulator diode VZD1 (14), so that the voltage regulator diode VZD1 (14) can be stabilized at 2.7V; the capacitor C1 (2) can filter out high-frequency noise from the gate and source of MOSFETQ1 (4); the connection between the resistors R3 (5) and R4 (11) is used to collect voltage sampling signals, and the voltage sampling signals are input to pin 2 of the voltage comparator chip LM293U1 (10); pin 3 of the voltage comparator chip LM293U1 (10) is connected to a +5V reference voltage, its pin 8 is connected to a +5V power supply voltage, and its pin 4 is grounded; when the voltage output to the camera and the fill light is greater than 22.3V, pin 1 of the voltage comparator chip LM293U1 (10) can output a low level, causing the triode transistor Q2 (9) to be cut off, so that the MOSFETQ1 (4) can be in a normal conduction power supply state, which is for the camera and the fill light provide a stable voltage and a constant current; when the voltage output to the camera and the fill light is equal to or less than 22.3 volts, the voltage comparator chip LM293U1 (10) pin 1 can output a high level, causing the triode transistor Q2 (9) to be turned on, which can obtain a -20 volt strong conduction voltage between the gate and the source of the MOSFETQ1 (4), which can put the MOSFETQ1 (4) in a fully turned-on state with a large current supply, providing a large current to the camera and the fill light while stabilizing the voltage at +24 volts; the resistor R5 (7), the resistor R6 (6), and the resistor R7 (8) form a current sampling module, and the sampling voltage at the connection point of the resistor R6 (6) and the resistor R7 (8) is transmitted to the base of the triode transistor Q4 (13);. The current flowing through the resistor R5 (7) is greater than 14A, which can turn on the triode transistor Q4 (13) and the triode transistor Q3 (12), causing the gate and source voltage of the MOSFETQ1 (4) to drop to 0.3V, which can turn off the MOSFETQ1 (4), preventing the continuous large current from burning the MOSFETQ1 (4), the camera, and the fill light; The triode transistor Q2 (9) and the triode transistor Q4 (13) are of the model SS8050; The model of the triode transistor Q3 (12) is SS8550.
2. The high current voltage stabilizing circuit module of the traffic violation capturing imaging system according to claim 1 is characterized in that: The model of the P-channel MOSFET Q1 (4) is IRF4435.
3. The high current voltage stabilizing circuit module of the traffic violation capturing imaging system according to claim 1 is characterized in that: The model of the voltage zener diode VZD1 (14) is 1N5986B.
4. The high current voltage stabilizing circuit module of the traffic violation capturing imaging system according to claim 1, characterized in that: The model of the voltage zener diode VZD2 (15) is 1N4744A.