Energy storage capacitor charging management system for laser range finder

Abstract

The utility model relates to an energy storage capacitor charging management system for a laser range finder. The energy storage capacitor charging management system comprises an energy storage capacitor charging circuit and a charging detection control circuit. The first end of the energy storage capacitor charging circuit is connected with an input power supply, and the second end is connected with the energy storage capacitor for charging the energy storage capacitor; the first end of the charging detection control circuit is connected with the energy storage capacitor charging circuit, the second end is connected with the energy storage capacitor, and the charging detection control circuit is used for collecting charging voltage data of the energy storage capacitor in real time, matching a corresponding target charging mode according to the charging voltage data and controlling the energy storage capacitor charging circuit to charge the energy storage capacitor according to the target charging mode. Therefore, the technical problems in the prior art are solved, the starting and working peak current of the laser range finder can be reduced, the charging time of the energy storage capacitor is shortened, the application of high-frequency ranging is supported, the working stability of the laser range finder is ensured, and an ideal effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser optoelectronics, and particularly relates to a charging management system for an energy storage capacitor of a laser rangefinder. Background Art

[0002] The traditional charging circuit for the energy storage capacitor of a laser rangefinder uses a fixed resistor for current-limiting charging. Since the resistance value is fixed, the charging current cannot be adaptively adjusted. Therefore, there are problems that when the value of the current-limiting resistor is small, the peak current at the moment of starting the laser rangefinder is large, or when the value of the current-limiting resistor is large, the charging speed of the laser rangefinder is slow and it does not support high-frequency ranging applications. Summary of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide a charging management system for an energy storage capacitor of a laser rangefinder to overcome the technical problems of large peak current at the moment of starting the laser rangefinder and slow charging speed in the prior art.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] According to the first aspect of the utility model, a charging management system for an energy storage capacitor of a laser rangefinder is provided, including an energy storage capacitor charging circuit and a charging detection and control circuit;

[0006] The first end of the energy storage capacitor charging circuit is connected to an input power supply, and the second end is connected to an energy storage capacitor, for charging the energy storage capacitor;

[0007] The first end of the charging detection and control circuit is connected to the energy storage capacitor charging circuit, and the second end is connected to the energy storage capacitor, for real-time collecting the charging voltage data of the energy storage capacitor, and matching a corresponding target charging mode according to the charging voltage data, and controlling the energy storage capacitor charging circuit to charge the energy storage capacitor according to the target charging mode.

[0008] Optionally, the charging detection and control circuit is further used for:

[0009] Comparing the charging voltage data with a preset voltage threshold;

[0010] When the charging voltage data is lower than the preset voltage threshold, sending a charging control signal corresponding to the trickle charging mode to the energy storage capacitor charging circuit;

[0011] When the charging voltage data is higher than or equal to the preset voltage threshold, sending a charging control signal corresponding to the constant current charging mode to the energy storage capacitor charging circuit.

[0012] Optionally, the energy storage capacitor charging circuit includes an NMOS transistor V1, a diode V2, a diode V3, a power inductor L1, and a sampling resistor Rcs;

[0013] The source of the NMOS transistor V1 is connected to the input power supply, the gate is connected to the charging detection control circuit, and the drain is connected to the positive electrode of the diode V2, for adjusting the magnitude of the charging current according to the charging control signal;

[0014] The negative electrode of the diode V2 is respectively connected to the positive electrode of the diode V3 and the first end of the power inductor L1; the second end of the power inductor L1 is connected to the first end of the sampling resistor Rcs, and the second end of the sampling resistor Rcs is connected to the energy storage capacitor.

[0015] Optionally, the energy storage capacitor charging circuit further includes a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, and a capacitor C6;

[0016] The capacitor C1, the capacitor C2, and the capacitor C3 serve as filter capacitors for the input power supply, the first ends are respectively connected to the input power supply and the source of the NMOS transistor V1, and the second ends are all grounded;

[0017] The capacitor C4, the capacitor C5, and the capacitor C6 serve as filter capacitors for the output power supply, the first ends are respectively connected to the second end of the resistor Rcs and the energy storage capacitor, and the second ends are all grounded.

[0018] Optionally, the charging detection control circuit includes a buck chip CN3768;

[0019] The CSP pin of the buck chip CN3768 is respectively connected to the second end of the power inductor L1 and the first end of the sampling resistor Rcs, for collecting a first voltage signal;

[0020] The BAT pin of the buck chip CN3768 is respectively connected to the second end of the sampling resistor Rcs and the first end of the energy storage capacitor, for collecting a second voltage signal, i.e., the charging voltage data of the energy storage capacitor;

[0021] The DVR pin of the buck chip CN3768 is connected to the gate of the NMOS transistor V1, to send the charging control signal to the energy storage capacitor charging circuit.

[0022] Optionally, the charging detection control circuit further includes a resistor R2 and a capacitor C10;

[0023] The COM pin of the step-down chip CN3768 is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the first end of the capacitor C10; the second end of the capacitor C10 is connected to the GND pin of the step-down chip CN3768 and grounded.

[0024] Optionally, the charging detection control circuit further includes a capacitor C7, a capacitor C8, and a capacitor C9;

[0025] The first end of the capacitor C7 is respectively connected to the input power supply and the VCC pin of the step-down chip CN3768, and the second end is connected to the VG pin of the step-down chip CN3768;

[0026] The capacitor C8 and the capacitor C9 are used as filter capacitors for the input power supply. The first ends are respectively connected to the input power supply and the first end of the capacitor C7, and the second ends are both grounded.

[0027] Optionally, the charging detection control circuit further includes a resistor R1 and an LD1 lamp;

[0028] The first end of the resistor R1 is respectively connected to the input power supply and the first end of the capacitor C7, and the second end is connected to the positive electrode of the LD1 lamp; the LD1 lamp is used as a charging indicator lamp, and the negative electrode is connected to the pin of the step-down chip CN3768.

[0029] Optionally, the preset voltage threshold is 75% of the overcharge voltage value.

[0030] Optionally, the trickle charging current value in the trickle charging mode is 17.5% of the constant current charging current value in the constant current charging mode.

[0031] One or more of the above technical solutions provided by the present invention may have the following advantages or at least achieve the following technical effects: A storage capacitor charging management system for a laser rangefinder provided by the present invention includes a storage capacitor charging circuit and a charging detection control circuit; the first end of the storage capacitor charging circuit is connected to an input power supply, and the second end is connected to a storage capacitor for charging the storage capacitor; the first end of the charging detection control circuit is connected to the storage capacitor charging circuit, and the second end is connected to the storage capacitor for real-time collecting charging voltage data of the storage capacitor and matching a corresponding target charging mode according to the charging voltage data, and controlling the storage capacitor charging circuit to charge the storage capacitor according to the target charging mode. The technical solution of this application overcomes the technical problems existing in the traditional technology, can not only reduce the start-up and working peak current of the laser rangefinder, but also shorten the charging time of the storage capacitor, supports the application of high-frequency ranging, ensures the stability of the laser rangefinder during operation, and achieves an ideal effect. Description of the Drawings

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 Schematic diagram of the structure of the energy storage capacitor charging management system provided by an embodiment of the present invention;

[0034] Figure 2 Circuit schematic diagram of the energy storage capacitor charging circuit provided by an embodiment of the present invention;

[0035] Figure 3 Circuit schematic diagram of the charging detection control circuit provided by an embodiment of the present invention.

[0036] The realization of the purpose of the present invention, functional features and advantages will be further described in conjunction with the embodiments and with reference to the drawings. Detailed implementation manners

[0037] To make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope protected by the present invention.

[0038] In order to overcome the technical problems of large peak current and slow charging speed at the moment of starting of the laser rangefinder in the prior art, the present invention provides an energy storage capacitor charging management system for a laser rangefinder. The specific embodiments and implementation manners are as follows:

[0039] Referring to Figure 1 , Figure 1 Schematic diagram of the structure of the energy storage capacitor charging management system of the present invention. An embodiment of the present invention provides an energy storage capacitor charging management system, which may include an energy storage capacitor charging circuit and a charging detection control circuit; the first end of the energy storage capacitor charging circuit is connected to the input power supply, and the second end is connected to the energy storage capacitor, and is used to charge the energy storage capacitor; the first end of the charging detection control circuit is connected to the energy storage capacitor charging circuit, and the second end is connected to the energy storage capacitor, and is used to collect the charging voltage data of the energy storage capacitor in real time, and match the corresponding target charging mode according to the charging voltage data, and control the energy storage capacitor charging circuit to charge the energy storage capacitor according to the target charging mode.

[0040] In the embodiment of the present utility model, the energy storage capacitor charging circuit is the main trunk for the input power supply to charge the energy storage capacitor. The charging detection and control circuit analyzes the collected charging voltage data of the energy storage capacitor and matches the corresponding charging mode to avoid excessive starting and working peak currents of the laser rangefinder. Specifically, the charging detection and control circuit can also be used to compare the charging voltage data with a preset voltage threshold; when the charging voltage data is lower than the preset voltage threshold, it sends a charging control signal corresponding to the trickle charging mode to the energy storage capacitor charging circuit; when the charging voltage data is higher than or equal to the preset voltage threshold, it sends a charging control signal corresponding to the constant current charging mode to the energy storage capacitor charging circuit. It can be understood that the trickle charging current value in the trickle charging mode is less than the constant current charging current value in the constant current charging mode. When the charging voltage data is low, the charging detection and control circuit adjusts the target charging mode to the trickle charging mode, which can effectively suppress the peak current at the moment of starting the laser rangefinder; adjust the charging control signal to enter the constant current charging mode to increase the charging rate and adjust the target charging mode to the constant current charging mode to increase the charging rate.

[0041] Further, as Figure 2 shown, the energy storage capacitor charging circuit in the embodiment of the present utility model includes an NMOS transistor V1, a diode V2, a diode V3, a power inductor L1, and a sampling resistor Rcs; the source of the NMOS transistor V1 is connected to the input power supply, the gate is connected to the charging detection and control circuit, and the drain is connected to the positive electrode of the diode V2, and is used to adjust the charging current magnitude according to the charging control signal; the negative electrode of the diode V2 is respectively connected to the positive electrode of the diode V3 and the first end of the power inductor L1. The diodes V2 and V3 both have unidirectional conductivity to prevent the current in the energy storage capacitor from flowing back; the second end of the power inductor L1 is connected to the first end of the sampling resistor Rcs, and the second end of the sampling resistor Rcs is connected to the energy storage capacitor.

[0042] Optionally, the energy storage capacitor charging circuit further includes capacitors C1, C2, C3, C4, C5, and C6; the capacitors C1, C2, and C3 are used as filter capacitors for the input power supply, the first ends are respectively connected to the input power supply and the source of the NMOS transistor V1, and the second ends are all grounded; the capacitors C4, C5, and C6 are used as filter capacitors for the output power supply, the first ends are respectively connected to the second end of the resistor Rcs and the energy storage capacitor, and the second ends are all grounded to charge the energy storage capacitor after filtering.

[0043] Further, as Figure 3As shown in the figure, the charging detection and control circuit in the embodiment of the present utility model includes a buck chip CN3768, which has functions such as voltage detection and charging current regulation; the CSP pins of the buck chip CN3768 are respectively connected to the second end of the power inductor L1 and the first end of the sampling resistor Rcs, for collecting the first voltage signal; the BAT pins of the buck chip CN3768 are respectively connected to the second end of the sampling resistor Rcs and the first end of the energy storage capacitor, for collecting the second voltage signal, that is, the charging voltage data of the energy storage capacitor; the DVR pin of the buck chip CN3768 is connected to the gate of the NMOS transistor V1 to send a charging control signal to the energy storage capacitor charging circuit.

[0044] It can be understood that Figure 3 the voltage detection 1 and voltage detection 2 shown in the figure respectively detect the voltage across the resistor Rcs, and feedback the detected voltage signal to the buck chip CN3768 for current modulation.

[0045] Optionally, the charging detection and control circuit further includes a resistor R2 and a capacitor C10; the COM pin of the buck chip CN3768 is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the first end of the capacitor C10; the second end of the capacitor C10 is connected to the GND pin of the buck chip CN3768 and grounded. The resistor R2 and the capacitor C10 form a loop compensation circuit to ensure the stability of the circuit.

[0046] Optionally, the charging detection and control circuit further includes a capacitor C7, a capacitor C8 and a capacitor C9; the first end of the capacitor C7 is respectively connected to the input power supply and the VCC pin of the buck chip CN3768, and the second end is connected to the VG pin of the buck chip CN3768; the capacitor C8 and the capacitor C9 are used as filtering capacitors for the input power supply, the first ends are respectively connected to the input power supply and the first end of the capacitor C7, and the second ends are both grounded.

[0047] Optionally, the charging detection and control circuit further includes a resistor R1 and an LD1 lamp; the first end of the resistor R1 is respectively connected to the input power supply and the first end of the capacitor C7, and the second end is connected to the positive pole of the LD1 lamp; the LD1 lamp is used as a charging indicator, and the negative pole is connected to the pin of the buck chip CN3768. The LD1 lamp lights up during the charging process and goes out after the energy storage capacitor is fully charged.

[0048] It is understandable that at the moment when the laser rangefinder is powered on and starts up, the voltage difference between the input voltage and the energy storage capacitor is large, and the current is relatively large at the moment when the energy storage capacitor starts to charge. If it cannot be effectively suppressed, the phenomenon of input voltage deviation will occur, which may interfere with the normal operation of the rest of the circuits in the laser rangefinder system. Based on the energy storage capacitor charging management system shown above, by detecting the voltage value of the energy storage capacitor, it is ensured that when the laser rangefinder is powered on and starts up, the energy storage capacitor is in the trickle charging mode. In this mode, the charging current is relatively low, which can effectively suppress the peak current of the laser rangefinder and avoid interfering with the operation of the rest of the circuits in the system; when it is detected that the voltage of the energy storage capacitor reaches the preset voltage threshold, it switches to the constant current charging mode. In this mode, the charging current is relatively large and adjustable, and can be adjusted as needed.

[0049] Preferably, the preset voltage threshold is 75% of the overcharge voltage value; the trickle charging current value in the trickle charging mode is 17.5% of the constant current charging current value in the constant current charging mode. It should be noted that the input voltage range of the buck chip CN3768 is 6.6V - 30V, and the overcharge voltage value is an internal parameter of the chip CN3768, with a typical value of 14.8V. 75% of the overcharge voltage is 11.1V. When the voltage of the energy storage capacitor is lower than 75% (11.1V) of the set overcharge voltage, the charging control signal is adjusted to enter the trickle charging mode. At this time, the charging current is 17.5% of the set constant current charging current, which can effectively suppress the peak current at the moment when the laser rangefinder starts up; when the voltage of the energy storage capacitor is greater than 75% (11.1V) of the set overcharge voltage, the charging control signal is adjusted to enter the constant current charging mode, and the magnitude of this current can be set as needed by adjusting the external resistor.

[0050] In the embodiment of the present utility model, the magnitude of the constant current charging current is determined by the resistance value of Rcs, and the calculation formula is as follows:

[0051]

[0052] where I is the constant current charging current value, in amperes, and Rcs is the sampling resistance value, in ohms.

[0053] An energy storage capacitor charging management system provided by an embodiment of the present utility model includes: an energy storage capacitor charging circuit and a charging detection and control circuit; a first end of the energy storage capacitor charging circuit is connected to an input power supply, and a second end is connected to the energy storage capacitor, for charging the energy storage capacitor; a first end of the charging detection and control circuit is connected to the energy storage capacitor charging circuit, and a second end is connected to the energy storage capacitor, for real-time collecting charging voltage data of the energy storage capacitor, and matching a corresponding target charging mode according to the charging voltage data, and controlling the energy storage capacitor charging circuit to charge the energy storage capacitor according to the target charging mode. The technical solution of the present utility model proposes an energy storage capacitor charging management circuit applicable to a laser rangefinder, which can not only reduce the starting and working peak currents of the laser rangefinder, but also shorten the charging time of the energy storage capacitor, and supports the application of high-frequency ranging; and has been put into the energy storage capacitor charging circuit of the actually applied laser rangefinder, and is tested under various extreme conditions, ensuring the stability of the laser rangefinder during operation and achieving an ideal effect.

[0054] It can be understood that the same or similar parts in the above embodiments can be referred to each other, and the content not detailed in some embodiments can be seen in the same or similar content of other embodiments.

[0055] It should be noted that in the description of the present utility model, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" refers to at least two.

[0056] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0057] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A charging management system for the energy storage capacitor of a laser rangefinder, characterized in that, It includes an energy storage capacitor charging circuit and a charging detection and control circuit; The first end of the energy storage capacitor charging circuit is connected to the input power supply, and the second end is connected to the energy storage capacitor, for charging the energy storage capacitor; The first end of the charging detection and control circuit is connected to the energy storage capacitor charging circuit, and the second end is connected to the energy storage capacitor, for collecting the charging voltage data of the energy storage capacitor in real time, and matching the corresponding target charging mode according to the charging voltage data, and controlling the energy storage capacitor charging circuit to charge the energy storage capacitor according to the target charging mode.

2. The energy storage capacitor charging management system according to claim 1, wherein The charging detection and control circuit is further used for: Comparing the charging voltage data with a preset voltage threshold; When the charging voltage data is lower than the preset voltage threshold, sending a charging control signal corresponding to the trickle charging mode to the energy storage capacitor charging circuit; When the charging voltage data is higher than or equal to the preset voltage threshold, sending a charging control signal corresponding to the constant current charging mode to the energy storage capacitor charging circuit.

3. The energy storage capacitor charging management system according to claim 2, wherein, The energy storage capacitor charging circuit includes an NMOS transistor V1, a diode V2, a diode V3, a power inductor L1, and a sampling resistor Rcs; The source of the NMOS transistor V1 is connected to the input power supply, the gate is connected to the charging detection and control circuit, and the drain is connected to the positive electrode of the diode V2, for adjusting the magnitude of the charging current according to the charging control signal; The negative electrode of the diode V2 is respectively connected to the positive electrode of the diode V3 and the first end of the power inductor L1; the second end of the power inductor L1 is connected to the first end of the sampling resistor Rcs, and the second end of the sampling resistor Rcs is connected to the energy storage capacitor.

4. The energy storage capacitor charging management system according to claim 3, wherein, The energy storage capacitor charging circuit further includes capacitors C1, C2, C3, C4, C5, and C6; The capacitors C1, C2, and C3 serve as filtering capacitors for the input power supply, the first ends are respectively connected to the input power supply and the source of the NMOS transistor V1, and the second ends are all grounded; The capacitors C4, C5, and C6 serve as filtering capacitors for the output power supply, the first ends are respectively connected to the second end of the resistor Rcs and the energy storage capacitor, and the second ends are all grounded.

5. The energy storage capacitor charging management system according to claim 3, characterized in that, The charging detection and control circuit includes a buck chip CN3768; The CSP pin of the buck chip CN3768 is respectively connected to the second end of the power inductor L1 and the first end of the sampling resistor Rcs, for collecting a first voltage signal; The BAT pin of the buck chip CN3768 is respectively connected to the second end of the sampling resistor Rcs and the first end of the energy storage capacitor, for collecting a second voltage signal, that is, the charging voltage data of the energy storage capacitor; The DVR pin of the buck chip CN3768 is connected to the gate of the NMOS transistor V1, to send the charging control signal to the energy storage capacitor charging circuit.

6. The energy storage capacitor charging management system according to claim 5, wherein The charging detection and control circuit further includes a resistor R2 and a capacitor C10; The COM pin of the step-down chip CN3768 is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the first end of the capacitor C10; the second end of the capacitor C10 is connected to the GND pin of the step-down chip CN3768 and grounded.

7. The energy storage capacitor charging management system according to claim 5, wherein, The charging detection control circuit further includes a capacitor C7, a capacitor C8, and a capacitor C9; The first end of the capacitor C7 is respectively connected to the input power supply and the VCC pin of the step-down chip CN3768, and the second end is connected to the VG pin of the step-down chip CN3768; The capacitor C8 and the capacitor C9 serve as filter capacitors for the input power supply. The first ends are respectively connected to the input power supply and the first end of the capacitor C7, and the second ends are both grounded.

8. The energy storage capacitor charging management system according to claim 7, wherein The charging detection control circuit further includes a resistor R1 and an LD1 lamp; The first end of the resistor R1 is respectively connected to the input power supply and the first end of the capacitor C7, and the second end is connected to the positive electrode of the LD1 lamp; the LD1 lamp serves as a charging indicator lamp, and the negative electrode is connected to the pin of the step-down chip CN3768.

9. The energy storage capacitor charging management system according to any one of claims 1 to 8, characterized in that The preset voltage threshold is 75% of the overcharge voltage value.

10. The energy storage capacitor charging management system according to claim 9, wherein The trickle charging current value in the trickle charging mode is 17.5% of the constant current charging current value in the constant current charging mode.

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