CN210347686U

CN210347686U - Constant voltage direct current load

Info

Publication number: CN210347686U
Application number: CN201920801959.3U
Authority: CN
Inventors: 钱梁凤
Original assignee: Shaoxing University Yuanpei College
Current assignee: Shaoxing University Yuanpei College
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-04-17
Anticipated expiration: 2029-05-30

Abstract

The utility model discloses a constant voltage direct current load, including controller, input detection module, power control module and protection module are connected to the controller, and power control module is connected to the protection module. The input detection module is used for detecting the voltage and current values of the circuit and transmitting the voltage and current values to the controller, the controller controls the power control module to realize adjustment, the protection module detects the voltage of the power control module, when the voltage is too high, a signal is sent to the controller, and the controller turns off the power control module. The beneficial effects of the utility model include: simple structure, good safety, high stability and wide application range.

Description

Constant voltage direct current load

Technical Field

The utility model relates to an electronic load field, in particular to constant voltage direct current load.

Background

An electronic load is an electronic load. Wherever a device is capable of consuming energy, it may be broadly referred to as a load. The electronic load can consume electrical energy to convert it to thermal energy or other forms of energy. The static electronic load may be resistive (e.g., power resistor, rheostat, etc.), inductive, or capacitive. However, in practical applications, the load form is complex, such as dynamic load, in which the consumed power is a function of time, or the current and voltage are dynamic, or constant current, constant resistance, constant voltage, different peak coefficients (in the case of ac), different power factors or instantaneous short circuit, etc. The electronic load is a test device designed and produced under the condition that the load is relatively complex in practical application. It can replace traditional load, such as resistance box, slide wire rheostat, resistance wire, inductance, capacitance, etc. Particularly, the method can show excellent performance in the fields which cannot be solved by the traditional methods, such as constant current attraction, constant voltage absorption, sudden change of voltage and current in a set range, and the like.

The utility model discloses a constant voltage load circuit and use this constant voltage load circuit's simulation battery and simulation group battery, publication No. CN 205594140U. The constant-voltage load circuit comprises a positive output end, a negative output end, a first resistor, a second resistor, a third resistor, a fourth resistor, a potentiometer, a sixth resistor, a seventh resistor, a controllable precise voltage-stabilizing source, a first triode, a third triode, a fourth triode and an output capacitor. The analog battery is composed of a direct current power supply and the constant voltage load circuit. The constant voltage load circuit can generate stable voltage output; the simulated battery using the constant voltage load circuit has battery output and load characteristics at the same time, and different voltages can be obtained by changing the resistance value of the potentiometer.

The prior art has the disadvantages of complex structure, higher cost, poor stability of an electronic load, lack of protection on the load and poor safety.

SUMMERY OF THE UTILITY MODEL

Complicated to prior art structure, the cost is higher, and electronic load's stability is not good enough, lacks the protection, the relatively poor problem of security, the utility model provides a constant voltage direct current load realizes controllable preventive measure through protection module, and simple structure, and stability is higher.

The technical scheme of the utility model is as follows.

A constant-voltage direct-current load comprises a controller, an input detection module, a power control module and a protection module, wherein the controller is connected with the input detection module, the power control module and the protection module, and the protection module is connected with the power control module. The input detection module is used for detecting the voltage and current values of the circuit and transmitting the voltage and current values to the controller, the controller controls the power control module to realize adjustment, the protection module detects the voltage of the power control module, when the voltage is too high, a signal is sent to the controller, and the controller turns off the power control module.

Preferably, the protection module comprises a voltage reference and a comparator, the non-inverting input end of the comparator is connected with the power control module, the inverting input end of the comparator is connected with the voltage reference, and the output end of the comparator is connected with the controller. A stable preset voltage is provided by the voltage reference device, and the comparator sends a signal to the controller when the voltage exceeds the preset voltage.

Preferably, a switch is further arranged between the protection module and the controller, and the controller stops receiving the signal of the protection module when the switch is turned off. When carrying out the power supply test, often not only need consider the circumstances when load normal work, also need detect the reaction of power under the circumstances that the load is out of control, consequently this load has set up manually controlled switch between protection module and controller for under the circumstances of guaranteeing experimental safety and needs, realize letting the load carry out the great working test of degree of freedom, improve the application scope of load.

Preferably, the model of the voltage reference is LM385 BZ-2.5. The model has mature technology, and is beneficial to improving the overall stability.

Preferably, the comparator is of the type MCP 6002. The model has mature technology, and is beneficial to improving the overall stability.

Preferably, the input detection module comprises an a/D converter, the a/D converter collects voltage signals through a plurality of voltage dividing resistors, the a/D converter collects current signals through a plurality of current feedback resistors, and an output end of the a/D converter is connected with the controller.

Preferably, the A/D converter is of the type ASD 1115. The model has mature technology, and is beneficial to improving the overall stability.

The beneficial effects of the utility model include: simple structure, good safety, high stability and wide application range.

Drawings

Fig. 1 is a schematic block diagram of an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a protection module according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of an input detection module according to an embodiment of the present invention;

in the figure: the device comprises a controller 1, an input detection module 2, a power control module 3 and a protection module 4.

Detailed Description

The technical scheme is further explained by combining the drawings in the specification.

Example 1:

as shown in fig. 1, the constant voltage dc load includes a controller 1, an input detection module 2, a power control module 3, and a protection module 4, wherein the controller 1 is connected to the input detection module 2, the power control module 3, and the protection module 4 is connected to the power control module 3. The control module is a singlechip and a working circuit thereof.

The circuit of the protection module 4 is shown in fig. 2, and includes a comparator U1, a voltage reference U2, a capacitor C1, and a plurality of resistors, wherein a pin 2 of the voltage reference U2 is connected to an inverting input terminal of the comparator U1, a non-inverting input terminal of the comparator U1 is connected to the power control module 3 through a resistor R2, and an output terminal of the comparator U1 is connected to the controller 1. The model of the voltage reference U2 is LM385 BZ-2.5. The model of the comparator U1 is MCP 6002. The model has mature technology, and is beneficial to improving the overall stability.

Fig. 3 is a schematic circuit diagram of the input detection module 2, which includes an a/D converter U3, a plurality of resistors, a diode, and a capacitor, wherein the a/D converter U3 collects a voltage signal through a plurality of voltage dividing resistors, the a/D converter U3 collects a current signal through a plurality of current feedback resistors, and an output terminal of the a/D converter U3 is connected to the controller 1. The model of the A/D converter U3 is ASD 1115. The model has mature technology, and is beneficial to improving the overall stability.

The working contents of each module are that the input detection module 2 is used for detecting the voltage and current values of the circuit and transmitting the voltage and current values to the controller 1, the controller 1 controls the power control module 3 to realize regulation, the protection module 4 detects the voltage of the power control module 3, when the voltage is too high, a signal is sent to the controller 1, and the controller 1 turns off the power control module 3.

Example 2:

the basic structure of this embodiment is the same as that of embodiment 1, except that embodiment 2 further includes a switch disposed between the protection module 4 and the controller 1, and the controller 1 stops receiving the signal of the protection module 4 when the switch is turned off. When a power supply test is carried out, not only the condition of normal work of a load is always needed to be considered, but also the reaction of the power supply under the condition of out-of-control load is needed to be detected, so that the load is provided with a manually controlled switch between the protection module 4 and the controller 1, the load is enabled to carry out a working test with a large degree of freedom under the condition of ensuring the safety and the requirement of the test, and the application range of the load is widened.

It should be noted that the specific embodiment is only used for further illustration of the technical solution, and is not used for limiting the scope of the technical solution, and any modification, equivalent replacement, improvement and the like based on the technical solution should be considered as being within the protection scope of the present invention.

Claims

1. The constant-voltage direct-current load is characterized by comprising a controller, an input detection module, a power control module and a protection module, wherein the controller is connected with the input detection module, the power control module and the protection module, and the protection module is connected with the power control module.

2. The constant-voltage direct-current load according to claim 1, wherein the protection module comprises a voltage reference and a comparator, a non-inverting input terminal of the comparator is connected with the power control module, an inverting input terminal of the comparator is connected with the voltage reference, and an output terminal of the comparator is connected with the controller.

3. The constant-voltage direct-current load according to claim 1 or 2, wherein a switch is further provided between the protection module and the controller.

4. The constant voltage dc load according to claim 2, wherein the voltage reference is LM385 BZ-2.5.

5. The constant voltage dc load according to claim 2, wherein the comparator is of the type MCP 6002.

6. The constant-voltage direct-current load according to claim 1 or 2, wherein the input detection module comprises an a/D converter, the a/D converter collects a voltage signal through a plurality of voltage dividing resistors, the a/D converter collects a current signal through a plurality of current feedback resistors, and an output end of the a/D converter is connected with the controller.

7. The constant voltage dc load according to claim 6, wherein the a/D converter is of the type ASD 1115.