Battery switching device for camera

Abstract

The utility model relates to the technical field of photography and video recording, in particular to a battery switching device for a camera. The device comprises at least two battery packs, and further comprises a sampling module, a sampling processor, a switch and an output electrode, each battery pack is respectively connected with the sampling module, and the sampling module is further sequentially connected with the sampling processor, the switch and the output electrode. According to the product, the charging and discharging automatic switching circuit can be realized, the switching battery pack still continuously supplies power to the load when any battery pack is insufficient in electric quantity, and the camera can be automatically switched through a plurality of groups of high-capacity batteries under the condition that the batteries are not replaced, so that shutdown is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of photography and videography, and particularly relates to a battery switching device for a camera. Background Art

[0002] During the shooting process, the camera needs to work continuously. It is necessary to automatically switch multiple sets of high-capacity batteries for the camera without replacing the battery to avoid shutdown. The circuits of existing solutions cannot accurately and quickly switch according to the battery voltage. The main defects include:

[0003] 1. Using the constant current characteristic of a triode to detect the battery voltage is inaccurate and prone to premature shutdown;

[0004] 2. The current capacity of the device is too small, and overload protection will occur when the load current exceeds 5A;

[0005] 3. There is no protection against reverse connection of the battery pack;

[0006] 4. The sampling of the battery voltage and the switching of the circuit use a microprocessor (MCU) or a dedicated battery voltage monitoring chip to control the entire switching link, which requires the development of corresponding software, and parameter adjustment is also relatively difficult and costly. Content of the Utility Model

[0007] (1) Technical Problems to be Solved

[0008] In view of the deficiencies of the prior art, the utility model provides a battery switching device for a camera, which has a fast response speed, high reliability and low cost.

[0009] (2) Technical Solutions

[0010] A battery switching device for a camera includes at least two groups of battery packs. Further, it also includes a sampling module, sampling processing, a switch and an output terminal. Each battery pack is respectively connected to the sampling module, and the sampling module is further sequentially connected to the sampling processing, the switch and the output terminal.

[0011] Preferably, each battery pack is also respectively connected with a charge-discharge reverse connection prevention circuit.

[0012] Preferably, a voltage stabilizing circuit and a reference voltage are connected in parallel between the charge-discharge reverse connection prevention circuits.

[0013] Preferably, there are several groups of the sampling processing, which are respectively connected to the positive switch and the negative switch of the switch, and the positive switch and the negative switch are further respectively connected to the positive output terminal and the negative output terminal of the output terminal.

[0014] Preferably, a PWM controller is connected in parallel between the sampling processing and the switch.

[0015] Preferably, there are two sets of the battery packs.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, the present utility model provides a novel battery switching device for a camera. This product can realize an automatic switching circuit for charging and discharging. When the power of any one set of battery packs is insufficient, the switched battery pack can still continuously supply power to the load, enabling the camera to avoid shutdown through the automatic switching of multiple sets of large-capacity batteries without replacing the battery. All the operations from data acquisition to control of this product are completed by hardware, and it has the following advantages: 1. The response speed of the switch is faster and it is more convenient to use; 2. It has higher system stability and reliability; 3. Lower manufacturing cost. Description of the Drawings

[0018] Figure 1 is a structural schematic diagram of this product;

[0019] Figure 2 is Figure 1 the circuit diagram of the anti-reverse connection circuit for charging and discharging in

[0020] Figure 3 is Figure 1 the circuit diagram for sampling and processing signals in

[0021] Figure 4 is Figure 1 the circuit diagram of the PWM controller and switch control in

[0022] Figure 5 is Figure 1 the circuit diagram of the reference voltage in

[0023] Figure 6 is the overall circuit schematic diagram of this product. Detailed Embodiments

[0024] The following further describes the present utility model in detail with reference to the accompanying drawings, where the same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper", "lower", "bottom surface" and "top surface" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0025] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0026] Design concept: Design a battery switching circuit to enable the camera to automatically switch between multiple large-capacity batteries without replacing the battery, avoiding downtime, with high precision and low cost.

[0027] Embodiment:

[0028] As Figures 1 - 6 shown, the technical solution provided by the present utility model is a battery switching device for a camera. The product includes battery pack one and battery pack two. Further, it also includes a sampling module, sampling processing, a switch, and an output terminal. Each battery pack is respectively connected to sampling module one and sampling module two, and each sampling module is further sequentially connected to sampling processing, the switch, and the output terminal; the sampling module is only responsible for sampling the current and voltage of the battery pack, while sampling processing one controls the on / off of the positive output, and sampling processing two controls the on / off of the negative terminal.

[0029] Battery pack one and battery pack two are also respectively connected with a charge-discharge reverse connection prevention circuit one and a charge-discharge reverse connection prevention circuit two. A voltage stabilizing circuit and a reference voltage are connected in parallel between the charge-discharge reverse connection prevention circuits.

[0030] There are several groups of sampling processing in this embodiment (including sampling processing one, sampling processing two, sampling processing three, sampling processing four), which are respectively connected to the positive pole switch one, positive pole switch two, negative pole switch one, and negative pole switch two of the switch, and the positive pole switch and the negative pole switch are further respectively connected to the output positive pole and output negative pole of the output terminal.

[0031] A PWM controller is connected in parallel between the sampling processing and the switch in this embodiment, adding PWM charging control.

[0032] Circuit principle description: R1, R2, R5, R6 and Q1, Q2, Q3, Q4 constitute a battery charge-discharge reverse connection prevention circuit. When J3, J7 are connected to the battery positive pole and J4, J8 are connected to the battery negative pole, Q2 is turned on to output the battery voltage. U1.1 and 1.2 judge whether the battery voltage reaches the turn-on voltage. When it is higher than 12V, Q5 and Q6 are turned on, U5 starts to output a PWM with a variable duty cycle, signals Q7 and Q8 are turned on, and J9 and J10 output 12V. When one of the batteries in J3, J7 is lower than 12V, U1.1 detects that the battery is too low, turns off Q2 and Q4, cuts off the battery pack with too low battery voltage, and at this time, it is powered by the other battery pack with a battery voltage higher than 12V, and there is still electricity between J3 and J7. When J1 and J2 are connected to an adapter and the battery voltage exceeds 12V, Q6 and Q7 are turned on again, and this group of batteries starts to output voltage. Working in this way repeatedly enables the replacement of the battery without affecting the voltage at the output terminal, achieving the function of continuous power supply.

[0033] Working principle:

[0034] This product adds two groups of battery voltage acquisition circuits and battery positive pole switch circuits. When more than two groups of battery packs supply power simultaneously, when the voltage of one group of batteries reaches the low voltage detection point, the positive and negative poles of the battery and the load are automatically disconnected. The calibrated reference voltage and the sampled voltage of the battery pack are used for real-time comparison and cumulative discharge operation of the current. When the battery reaches 80% of its nominal capacity, one of the battery groups is cut off and the other battery group supplies power alone. At the same time, an external adapter can be connected to charge all these batteries while the device is in use.

[0035] This product continuously, rapidly and accurately acquires the voltage of the battery pack. The voltage and dynamic discharge current of the battery are monitored in real time and rapidly through the current and voltage detection circuits. 1. When the voltage of the battery pack is lower than the calibrated voltage of the battery, the discharge circuit is quickly cut off. The discharge circuit is only turned on when the battery voltage returns to the calibrated voltage. 2. The current is cumulatively calculated. When the cumulative discharge of the battery pack reaches 80% of its nominal capacity, the output circuit is cut off.

[0036] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery switching device for a camera, comprising at least two battery packs, characterized in that: It also includes a sampling module, a sampling process, a switch and an output pole. Each battery pack is connected to the sampling module respectively, and the sampling module is further connected to the sampling process, the switch and the output pole in sequence.

2. A camera battery switching device according to claim 1, characterized in that: Each battery pack is also connected to a charge and discharge reverse connection protection circuit.

3. A camera battery switching device according to claim 2, characterized in that: A voltage stabilizing circuit and a reference voltage are connected in parallel between the charge and discharge reverse connection prevention circuits.

4. A battery switching device for a camera according to claim 1, characterized in that: The sampling process has several groups, which are respectively connected to the positive switch and the negative switch of the switch, and the positive switch and the negative switch are further connected to the output positive pole and the output negative pole of the output pole respectively.

5. A camera battery switching device according to claim 1, characterized in that: A PWM controller is connected in parallel between the sampling process and the switch.

6. A camera battery switching device according to claim 1, characterized in that: The battery packs include two groups.

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