Capacitor charging voltage adjustable automatic power-off circuit

Abstract

The utility model discloses a capacitor charging voltage adjustable automatic power-off circuit comprising a voltage threshold adjusting resistor, a voltage comparison element electrically connected with the voltage threshold adjusting resistor, a relay connected in series with the voltage comparison element, and a capacitor group connected in series with the relay. The voltage threshold adjusting resistor comprises a first adjusting resistor and a second adjusting resistor, and the capacitor bank comprises a first capacitor load and a second capacitor load. The utility model solves the problems that the current market still adopts a direct-current power supply direct charging method of a device controller such as a relay and the like, the capacitor voltage still cannot be adjusted at any time, or the MCU is used for detecting the voltage and logically judging and then sending a command to the corresponding control device to cut off power, the resource is occupied, the cost is higher, and the reliability is higher. The voltage of the capacitor depends on the voltage of a power supply for charging the capacitor and cannot be controlled, and the applicability to the load type of the capacitor is not high.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an automatic power-off circuit with adjustable capacitor charging voltage. Background Art

[0002] In electromagnet loads, as the load power increases, the requirements for the power supply are also getting higher and higher. In addition, the load action logic of the electromagnet is often characterized by short time and large current, which led to the use of capacitors to power such loads.

[0003] However, it still has the following disadvantages in actual use:

[0004] Currently, most of the devices on the market that meet this demand still use direct DC power supply charging methods such as relays. The capacitor voltage still cannot be adjusted at any time, or an MCU is used to detect the voltage and make logical judgments before sending a command to the corresponding control device to cut off the power. This is more resource-intensive and costly, and the capacitor voltage depends on the power supply voltage used to charge it and cannot be controlled. It is not very applicable to the types of capacitor loads.

[0005] Therefore, a new automatic power-off circuit with adjustable capacitor charging voltage is proposed to solve the above problems. Utility Model Content

[0006] Technical issues to be solved

[0007] The purpose of the utility model is to provide an automatic power-off circuit with adjustable capacitor charging voltage, so as to solve the problems mentioned in the above background technology that most of the direct charging methods of DC power supply using device controllers such as relays are still used on the market to meet such needs, and the capacitor voltage cannot be adjusted at any time, or an MCU is used to detect the voltage and make logical judgments before sending a command to the corresponding control device to cut off the power, which takes up more resources and has high cost, and the capacitor voltage depends on the power supply voltage used to charge it and cannot be controlled, and the applicability to the types of capacitor loads is not strong.

[0008] Technical Solution

[0009] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0010] The utility model is a capacitor charging voltage adjustable automatic power-off circuit, comprising:

[0011] A voltage threshold adjustment resistor, a voltage comparison element electrically connected to the voltage threshold adjustment resistor, a relay connected in series with the voltage comparison element, and a capacitor group connected in series with the relay.

[0012] Further, the voltage threshold adjustment resistor includes a first adjustment resistor and a second adjustment resistor;

[0013] Specifically, the first adjustment resistor and the second adjustment resistor are used to divide the voltage on the line.

[0014] Further, the capacitor group includes a first capacitor load and a second capacitor load;

[0015] Specifically, the capacitor bank is an array of capacitive loads that need to be charged, and the number of series and parallel connections depends on specific load requirements.

[0016] Further, the first adjustment resistor and the second adjustment resistor are connected in series, and the second adjustment resistor and the voltage comparison element are connected in parallel;

[0017] Specifically, the voltage comparison element is used to control the power switch of the relay.

[0018] Furthermore, the voltage comparison element has an external terminal connected to ground;

[0019] Specifically, relays represent powerful electrical switches that charge capacitive loads.

[0020] Beneficial Effects

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] The utility model realizes that when a DC source charges a capacitor and reaches a set threshold, the relay can be automatically disconnected to restore the voltage, and when the capacitor voltage drops to a certain value, the relay and other control devices can be automatically closed to charge the capacitor again, so that the capacitor voltage is maintained within a certain range.

[0023] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is the circuit schematic diagram of the utility model.

[0026] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0027] 1. First adjustment resistor; 2. Second adjustment resistor; 3. Voltage comparison element; 4. Relay; 5. First capacitive load; 6. Second capacitive load. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation methods disclosed below.

[0030] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general scale, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0031] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Example 1

[0033] See also Figure 1 As shown, this embodiment is a capacitor charging voltage adjustable automatic power-off circuit, comprising:

[0034] A voltage threshold adjustment resistor, a voltage comparison element 3 electrically connected to the voltage threshold adjustment resistor, a relay 4 connected in series with the voltage comparison element 3, and a capacitor group connected in series with the relay 4;

[0035] The voltage threshold adjustment resistor includes a first adjustment resistor 1 and a second adjustment resistor 2;

[0036] The capacitor group includes a first capacitor load 5 and a second capacitor load 6;

[0037] The first adjustment resistor 1 and the second adjustment resistor 2 are connected in series, and the second adjustment resistor 2 and the voltage comparison element 3 are connected in parallel;

[0038] The voltage comparison element 3 is connected to the ground at its outer end;

[0039] How to, publish the following steps:

[0040] When the voltage of the capacitor group is lower than the set value, due to the voltage division effect of the first adjustment resistor 1R1 and the second adjustment resistor 2R2, the action threshold of the voltage comparison element 3QA5 is not reached, so the voltage comparison element 3QA5 is always turned on, so that the controlled relay 4 is also normally attracted, and the power supply charges the capacitor group through the mint contact of the relay 4. As the voltage of the capacitor group continues to rise, the voltage shared by the first adjustment resistor 1R1 and the second adjustment resistor 2R2 gradually increases. When the voltage of the second adjustment resistor 2R2 reaches the threshold set by the voltage comparison element 3QA5, the voltage comparison element 3QA5 is turned off, so that the power supply of the connected relay 4 is disconnected, and the power-off contact of the relay 4 is disconnected, thereby disconnecting the power supply for charging the capacitor group to stop charging. When the voltage across the capacitor group is lower than a certain value, the voltage division on the second adjustment resistor 2R2 is lower than the threshold of the voltage comparison element 3QA5, and the voltage comparison element 3QA5 is turned on again, so that the relay 4 is closed and the capacitor group is charged again.

[0041] This step can automatically disconnect the relay to restore the voltage, and when the capacitor voltage drops to a certain value, the relay and other control devices can be automatically closed to charge the capacitor again.

[0042] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A capacitor charging voltage adjustable automatic power-off circuit, characterized in that: include: A voltage threshold adjustment resistor, a voltage comparison element (3) electrically connected to the voltage threshold adjustment resistor, a relay (4) connected in series with the voltage comparison element (3), and a capacitor group connected in series with the relay (4); The voltage threshold adjustment resistor comprises a first adjustment resistor (1) and a second adjustment resistor (2); The first adjustment resistor (1) and the second adjustment resistor (2) are connected in series, and the second adjustment resistor (2) and the voltage comparison element (3) are connected in parallel.

2. A capacitor charging voltage adjustable automatic power-off circuit according to claim 1, characterized in that: The capacitor group includes a first capacitor load (5) and a second capacitor load (6).

3. A capacitor charging voltage adjustable automatic power-off circuit according to claim 1, characterized in that: The voltage comparison element (3) is externally connected to the ground.

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