Voltage display system based on high-voltage direct current

Abstract

The invention relates to the technical field of high-voltage direct current detection, and particularly discloses a voltage display system based on high-voltage direct current. The voltage detection module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a protection circuit and a direct current pointer voltmeter; the first resistor, the second resistor and the third resistor are connected in series; one end, far away from the second resistor, of the third resistor is a first input end; one end, far away from the second resistor, of the first resistor is a second input end; the protection circuit is connected in parallel with the third resistor. The fourth resistor is connected in series with the DC pointer voltmeter and is connected in parallel with the second resistor. The joint of the second resistor and the third resistor is grounded; and the direct current pointer voltmeter is used for converting the microampere-level current corresponding to the fourth resistor into direct current voltage through a voltage display model according to a preset conversion coefficient and the resistance value of each resistor and displaying the direct current voltage.

Description

Technical Field

[0001] The present invention relates to the technical field of high - voltage DC detection, and particularly relates to a voltage display system based on high - voltage DC. Background Art

[0002] A DC voltage transformer is a measuring instrument for measuring DC voltage. However, there are some problems with existing DC voltage transformers:

[0003] 1. Large floor area: The overall volume of the DC voltage transformer is relatively large, resulting in a large floor area. When in use, sufficient area needs to be provided for the DC voltage transformer to achieve its installation and use. At the same time, the large volume also leads to a relatively high manufacturing cost of the entire DC voltage transformer.

[0004] 2. Large error: Existing DC voltage transformers have a large error when detecting high DC voltages, greatly increasing the distrust of customers in their use.

[0005] Based on this, there is an urgent need for a voltage display system based on high - voltage DC that can accurately detect and display high - voltage DC and improve the accuracy of high - voltage DC detection. Summary of the Invention

[0006] One of the purposes of the present invention is to provide a voltage display system based on high - voltage DC that can accurately detect and display high - voltage DC and improve the accuracy of high - voltage DC detection.

[0007] To achieve the above - mentioned purpose, a voltage display system based on high - voltage DC is provided, which includes a voltage detection module;

[0008] The voltage detection module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a protection circuit, and a DC pointer voltmeter;

[0009] The first resistor, the second resistor, and the third resistor are connected in series; one end of the third resistor far from the second resistor is the first input terminal; one end of the first resistor far from the second resistor is the second input terminal;

[0010] The protection circuit is connected in parallel with the third resistor, the fourth resistor is connected in series with the DC pointer voltmeter and in parallel with the second resistor; the connection between the second resistor and the third resistor is grounded; the DC pointer voltmeter is used to convert the micro - ampere - level current corresponding to the fourth resistor into DC voltage and display it through a voltage display model according to a preset conversion coefficient and the resistance values of each resistor.

[0011] Principle and beneficial effects of this solution: In this solution, since the resistance values of the first resistor, the second resistor, the third resistor, and the fourth resistor are known, when there is corresponding current passing through, that is, when the corresponding first input terminal and second input terminal are connected to the circuit of other products, the DC pointer voltmeter can detect the voltage value where the DC pointer voltmeter is located. After that, based on the known information, the input voltage of the low-voltage winding can be calculated, and through the conversion coefficient, the voltage value corresponding to the high voltage can be achieved and displayed through the DC pointer voltmeter, so as to realize the detection and display of the voltages at the first input terminal and the second input terminal, and thus realize the accurate detection of the voltage corresponding to the high-voltage DC.

[0012] Through the cooperation between each resistor and the DC pointer voltmeter, the measurement of its voltage value is realized, and through the detection result of the DC pointer voltmeter, the voltage value of the high-voltage input is calculated through the voltage display model, and the corresponding calculation result is displayed through the DC pointer voltmeter. In this way, first, the accuracy of the DC pointer voltmeter during detection is ensured, and at the same time, the accurate voltage value detected is used for the reverse calculation of the voltage value input at the high-voltage input terminal, and the voltage display model is used for derivation, greatly improving the accurate calculation of the voltage value input at the high-voltage input terminal, thus realizing the accurate detection and display of the high-voltage DC and improving the accuracy of the high-voltage DC detection.

[0013] Further, the protection circuit includes a capacitor and a diode, and the capacitor is connected in parallel with the diode.

[0014] Beneficial effects: In this solution, the protection of the voltage detection module is realized through the setting of the protection circuit, greatly improving the safety of the voltage detection module during detection.

[0015] Further, the voltage display model is:

[0016]

[0017] In the formula: PV2 is the voltage value displayed by the DC pointer voltmeter, V 检 is the voltage value detected by the DC pointer voltmeter, R 1 is the resistance value of the first resistor, R 2 is the resistance value of the second resistor, R 3 is the resistance value of the third resistor, R 4 is the resistance value of the fourth resistor, r is the internal resistance of the DC pointer voltmeter, and M is the conversion coefficient.

[0018] Beneficial effects: By using the detected value of the DC pointer voltmeter and the voltage display model to determine the voltage value displayed by the DC pointer voltmeter, the voltage value corresponding to the detected high voltage can be determined and displayed. Cleverly, the detected value and the displayed value of the DC pointer voltmeter are different, so that the voltage corresponding to the high-voltage DC can be detected by a DC pointer voltmeter with relatively low cost, greatly reducing the hardware requirements for detecting high-voltage DC and greatly reducing the cost.

[0019] Further, it also includes a secondary voltage sensor connected in parallel with the DC pointer voltmeter; the secondary voltage sensor is used to measure the voltage of the DC pointer voltmeter.

[0020] Beneficial effects: In this solution, the secondary voltage sensor is used to detect whether the application effect corresponding to the high-voltage DC during use is qualified, greatly improving the diversity of the usage scenarios of the system. Description of the Drawings

[0021] Figure 1 It is the wiring schematic diagram of the high-voltage DC display system in Embodiment 1 of the present invention. Detailed Description of the Invention

[0022] The following is further detailed through specific embodiments:

[0023] Embodiment 1

[0024] A voltage display system based on high-voltage DC, basically as Figure 1 shown, includes a voltage detection module;

[0025] The voltage detection module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a protection circuit, and a DC pointer voltmeter;

[0026] The first resistor, the second resistor, and the third resistor are connected in sequence. The other end of the third resistor far from the second resistor is the first input terminal; the other end of the first resistor far from the second resistor is the second input terminal; the protection circuit is arranged in parallel with the third resistor. In this embodiment, the protection circuit includes a capacitor and a diode, and the capacitor and the diode are arranged in parallel. The fourth resistor and the DC pointer voltmeter are connected in sequence. The end of the fourth resistor far from the DC pointer voltmeter is connected to one end of the second resistor, and the end of the DC pointer voltmeter far from the fourth resistor is connected to the other end of the second resistor; the connection between the second resistor and the third resistor is grounded.

[0027] The DC pointer voltmeter is used to convert the microampere-level current on the circuit path corresponding to the fourth resistor into DC voltage and display it according to a preset conversion coefficient and the resistance values of each resistor through a voltage display model. Specifically, first, the first input terminal and the second input terminal are connected to the product circuit to form a voltage difference between the first input terminal and the second input terminal, which realizes the voltage connection of the input terminal and enables the next voltage detection. Then, the DC pointer voltmeter is used to detect the voltage of the circuit where the DC pointer voltmeter is located. Then, according to the connection characteristics of each resistor in the current circuit, that is, the first resistor, the second resistor, and the third resistor are connected in series, and the fourth resistor and the DC pointer voltmeter are connected in series and set in parallel with the second resistor. According to this connection characteristic, it can be known that the voltage of the second resistor is equal to the voltage of the fourth resistor plus the voltage value detected by the DC pointer voltmeter, and the voltage value output by the bridge rectifier circuit can be calculated. After that, the voltage value is converted according to the preset conversion coefficient, and the voltage value input to the high-voltage winding can be known. Then, the DC pointer voltmeter displays this voltage value, thus realizing the detection and display functions of the high-voltage DC voltage value.

[0028] The protection circuit includes a capacitor and a diode, and the capacitor is set in parallel with the diode.

[0029] The voltage display model is as follows:

[0030]

[0031] In the formula: PV2 is the voltage value displayed by the DC pointer voltmeter, V 检 is the voltage value detected by the DC pointer voltmeter, R 1 is the resistance value of the first resistor, R 2 is the resistance value of the second resistor, R 3 is the resistance value of the third resistor, R 4 is the resistance value of the fourth resistor, r is the internal resistance of the DC pointer voltmeter, and M is the conversion coefficient.

[0032] In this embodiment, R 1 = 1000 kΩ, R 2 = 30 Ω, R 3 = 50 Ω, R 4 = 20 kΩ. When selecting the DC pointer voltmeter, a DC pointer voltmeter with an internal resistance of 10 kΩ, a precision of 1.5 levels, an analog input of 0 - 100 μA, and an output of 0 - 100 kV is selected.

[0033] It also includes a secondary voltage sensor connected in parallel with the DC pointer voltmeter; the secondary voltage sensor is used to measure the voltage of the DC pointer voltmeter. In this embodiment, the calculation formula for the detected voltage corresponding to the secondary voltage sensor is as follows:

[0034]

[0035] Where: VWB4 is the voltage value detected by the secondary voltage sensor, and r WB4 is the internal resistance of the secondary voltage sensor. In this embodiment, the secondary voltage sensor is CE-VM02-54MS-1V (output 4-20 mA). In this embodiment, considering the actual use process of the input voltage, the requirements corresponding to different products are different. For example, if a vacuum cleaner is to achieve a good dust suction effect, its voltage value needs to reach a preset voltage value, and the secondary voltage sensor can judge this characteristic to facilitate the operator to perform subsequent process adjustments.

[0036] The above are only embodiments of the present invention. The specific structures and characteristics and other common knowledge in the solution are not described in detail here. Those of ordinary skill in the art know all the common technical knowledge in the technical field to which the invention belongs before the application date or the priority date, can know all the existing technologies in this field, and have the ability to apply the conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, combine their own abilities to improve and implement this solution. Some typical well-known structures or well-known methods should not become an obstacle for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners and other records in the specification can be used to explain the content of the claims.

Claims

1. A voltage display system based on high-voltage direct current, characterized in that: it includes a voltage detection module; the voltage detection module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a protection circuit and a DC pointer voltmeter; the first resistor, the second resistor and the third resistor are connected in series; one end of the third resistor far from the second resistor is the first input terminal; one end of the first resistor far from the second resistor is the second input terminal; the protection circuit is connected in parallel with the third resistor, and the fourth resistor is connected in series with the DC pointer voltmeter and in parallel with the second resistor at the same time; the connection between the second resistor and the third resistor is grounded; the DC pointer voltmeter is used to convert the microampere-level current corresponding to the fourth resistor into DC voltage and display it through a voltage display model according to a preset conversion coefficient and the resistance values of each resistor.

2. The voltage display system based on high-voltage direct current according to claim 1, characterized in that: the protection circuit includes a capacitor and a diode, and the capacitor is connected in parallel with the diode.

3. The voltage display system based on high-voltage direct current according to claim 1, characterized in that: the voltage display model is: Where: PV2 is the voltage value displayed by the DC pointer voltmeter, Vdet is the voltage value detected by the DC pointer voltmeter, R 1 is the resistance value of the first resistor, R 2 is the resistance value of the second resistor, R 3 is the resistance value of the third resistor, R 4 is the resistance value of the fourth resistor, r is the internal resistance of the DC pointer voltmeter, and M is the conversion coefficient.

4. The voltage display system based on high-voltage direct current according to claim 3, characterized in that: it further includes a secondary voltage sensor connected in parallel with the DC pointer voltmeter; the secondary voltage sensor is used to measure the voltage of the DC pointer voltmeter.

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