Ultralow-frequency high-voltage generator power supply indicating device and working method

Abstract

The invention discloses an ultralow-frequency high-voltage generator power supply indicating device and a working method. The ultralow-frequency high-voltage generator power supply indicating device comprises a power supply module, a voltage detection channel and a control module, the input end of the voltage detection channel is connected with the power module, and the output end of the voltage detection channel is connected with the control module; the power supply module comprises a power supply zero line, a power supply live line and a power supply ground line, the voltage detection channel comprises a first voltage detection channel, a second voltage detection channel and a third voltage detection channel, and the input end of the first voltage detection channel is connected to the power supply zero line; the input ends of the second voltage detection channel and the third voltage detection channel are connected to the two ends of the fuse. The ultra-low-frequency high-voltage generator is ensured to operate in a good grounding state, electric shock accidents possibly caused by poor grounding are avoided, and personal safety of operators and normal use of instruments are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of electronics and high-voltage measurement, and in particular to an ultra-low frequency high-voltage generator power supply indicating device and a working method. Background Art

[0002] As a dangerous high-voltage test instrument, the safety of the ultra-low frequency high-voltage generator is extremely important in practical applications, especially to ensure that it is well grounded and the power supply voltage is within the safe operating range.

[0003] The existing power supply indicator device cannot make accurate judgments on poor grounding conditions, such as the situation where both the power input and output ends are not connected to the ground wire or the neutral wire and live wire are connected reversely, which cannot be effectively detected, thereby posing a potential threat to the safety of the ultra-low frequency high-voltage generator itself and the operator.

[0004] The existing power indicator device can determine whether it is powered, but cannot detect whether the power supply voltage is within the allowable range. This will cause the ultra-low frequency high voltage generator to continue working when the power supply voltage is abnormal, bringing certain safety hazards to the ultra-low frequency high voltage generator.

[0005] In addition, the power indicator device in the prior art lacks detection of the fuse status and cannot detect whether the fuse is blown, which brings inconvenience to equipment maintenance. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a power indication device and a working method for an ultra-low frequency high-voltage generator. The present invention detects the voltage of the neutral line, the live line and the ground line (power module) of the input power supply to the ground terminal of the ultra-low frequency high-voltage generator and the voltage at both ends of the fuse to determine whether the grounding, input voltage and fuse of the ultra-low frequency high-voltage generator are normal, whether power is allowed to be connected, and displays it through a first LED power indicator light and a second LED power indicator light, and can also transmit relevant information through a communication port.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides an ultra-low frequency high voltage generator power indication device, comprising: a power module, a voltage detection channel and a control module; the input end of the voltage detection channel is connected to the power module, and the output end of the voltage detection channel is connected to the control module;

[0009] The power module comprises a power neutral line, a power live line and a power ground line, wherein the power live line is provided with a fuse and a relay; the output end of the control module is electrically connected to the relay;

[0010] The voltage detection channel includes a first voltage detection channel, a second voltage detection channel and a third voltage detection channel, wherein the input end of the first voltage detection channel is connected to the power neutral line, and the input ends of the second voltage detection channel and the third voltage detection channel are respectively connected to the two ends of the fuse.

[0011] As a further technical solution, the input end of the power neutral line is respectively connected to the input end of the first voltage detection channel and the output end of the power neutral line to obtain the input voltage VN of the first voltage detection channel.

[0012] As a further technical solution, the power ground wire in the power module is respectively connected to the ground wire of the control module and the ground terminal of the power module.

[0013] As a further technical solution, the input end of the live wire of the power supply is respectively connected to one end of the fuse and the input end of the second voltage detection channel, the other end of the fuse is respectively connected to the input end of the third voltage detection channel and one end contact of the relay, and the other end contact of the relay is connected to the output end of the live wire of the power supply; and the input voltages of the second voltage detection channel and the third voltage detection channel are obtained, which are VL and VF respectively.

[0014] As a further technical solution, the output ends of the first voltage detection channel, the second voltage detection channel and the third voltage detection channel are all connected to the input end of the control module.

[0015] As a further technical solution, the output end of the control module is also electrically connected to a first LED power indicator light and a second LED power indicator light, respectively. The first LED power indicator light and the second LED power indicator light are both dual-color LED power indicator lights.

[0016] As a further technical solution, the first voltage detection channel, the second voltage detection channel and the third voltage detection channel are all half-wave rectifier filter circuits with sampling function, and all include sampling resistors, voltage divider resistors, filter capacitors, diodes and operational amplifiers, wherein the diodes include a first diode and a second diode, and the operational amplifiers include a first operational amplifier and a second operational amplifier.

[0017] As a further technical solution, one end of the sampling resistor is a voltage input end, and the other end of the sampling resistor is respectively connected to one end of the voltage divider resistor, one end of the filter capacitor, the positive electrode of the first diode and the negative input end of the first operational amplifier, the positive input end of the first operational amplifier is grounded, the output end of the first operational amplifier and the negative electrode of the first diode are commonly connected to the positive electrode of the second diode, the negative electrode of the second diode, the other end of the voltage divider resistor and the other end of the filter capacitor are commonly connected to the positive input end of the second operational amplifier, the negative input end of the second operational amplifier is connected to the output end of the second operational amplifier and serves as a voltage output end, and is connected to the input end of the control module.

[0018] In a second aspect, the present invention provides a working method of an ultra-low frequency high-voltage generator power supply indication device, based on an ultra-low frequency high-voltage generator power supply indication device provided in the first aspect, comprising: setting a first voltage threshold VLF for judging whether a fuse is blown in a control module, setting a second voltage threshold VNONE for judging whether there is voltage, setting a third voltage threshold VGND for judging whether grounding is poor, setting a fourth voltage threshold VM IN for judging whether an input voltage is too low, and setting a fifth voltage threshold VMAX for judging whether an input voltage is too high; when the fuse is blown, a voltage difference appears at both ends of the fuse, and judging whether the fuse is blown is based on whether the voltage difference between VL and VF exceeds VLF;

[0019] When both VL and VN are less than VNONE, it is judged that the input and output terminals of the power supply are not grounded, which is regarded as poor grounding; when VL is greater than VNONE and VN is greater than VGND, it is judged that the corresponding power supply neutral line and power supply live line are not reversed, but it is regarded as poor grounding; when VL is greater than VGND and VN is greater than VNONE, it is judged that the corresponding power supply neutral line and power supply live line are reversed, which is also regarded as poor grounding; when VL is greater than VNONE and VN is less than VGND, it is judged that the power supply neutral line and power supply live line are not reversed, which is regarded as good grounding; when VN is greater than VNONE and VL is less than VGND, it is judged that the power supply neutral line and power supply live line are reversed, which can also be regarded as good grounding;

[0020] When the voltage difference between VL and VN is less than VM IN, the input voltage is considered to be too low; when the voltage difference between VL and VN is greater than VMAX, the input voltage is considered to be too high.

[0021] As a further technical solution, when the fuse is blown, the first LED power indicator light and the second LED power indicator light are off; when the grounding is poor, the first LED power indicator light displays red, otherwise it displays green; when the input voltage is too low, the second LED power indicator light is off, and when the input voltage is too high, the second LED power indicator light displays red, otherwise it displays green.

[0022] One or more technical solutions of the present invention have the following beneficial effects:

[0023] (1) The present invention designs a first voltage detection channel, a second voltage detection channel and a third voltage detection channel, and the input end of the first voltage detection channel is connected to the neutral line of the power supply, and the input ends of the second voltage detection channel and the third voltage detection channel are connected to the two ends of the fuse of the live line of the power supply, thereby respectively obtaining the neutral line voltage of the power supply, the live line voltage of the power supply and the voltage at both ends of the fuse, and by setting multiple voltage thresholds in the control module for judgment, it is possible to accurately judge a variety of poor grounding conditions and whether the fuse is blown and other complex conditions. This comprehensive grounding detection mechanism ensures that the ultra-low frequency high-voltage generator operates in a well-grounded state, avoids electric shock accidents that may be caused by poor grounding, and ensures the personal safety of operators and the normal use of the instrument.

[0024] (2) The present invention uses two dual-color LED power indicator lights (a first LED power indicator light and a second LED power indicator light) for display. The first LED power indicator light displays red when the grounding is poor and displays green when it is normal; the second LED power indicator light turns off when the input voltage is too low, displays red when it is too high, and displays green when it is normal. This intuitive display method eliminates the need for operators to perform complex detection operations. Operators can quickly understand the grounding, power supply, and fuse status of the instrument by simply observing the color status of the dual-color LED power indicator lights, greatly improving the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 This is a circuit principle block diagram of an ultra-low frequency high voltage generator power supply indicator device of the present invention:

[0027] Figure 2 The present invention discloses a circuit diagram of a voltage detection channel of an ultra-low frequency high voltage generator power supply indicating device. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0029] Embodiment 1

[0030] The present invention provides a power indicator device for an ultra-low frequency high voltage generator, such as Figure 1As shown in the circuit principle block diagram of the power indicator device, it includes a power module, a voltage detection channel and a control module, wherein the input end of the voltage detection channel is connected to the power module, and the output end of the voltage detection channel is connected to the control module. The control module uses a single-chip microcomputer, the single-chip microcomputer model is LPC2136, and the voltage detection channel outputs a 1.98V DC voltage when the input is 220V AC. Specifically: the power module is used for power supply, the power module YHT4S inputs an AC voltage of 85-500V, and its input AC voltage is a wide voltage range to adapt to various voltages, and the power module includes a power neutral line N, a power live line L and a power ground line, wherein a fuse F and a relay are arranged on the power live line, and the relay is JQX-102F-12VDC, and the output end of the control module is electrically connected to the relay to control the relay on and off.

[0031] In this embodiment, the voltage detection channel includes a first voltage detection channel, a second voltage detection channel and a third voltage detection channel, wherein the input end of the first voltage detection channel is connected to the neutral line of the power supply, the input ends of the second voltage detection channel and the third voltage detection channel are connected to the two ends of the fuse of the live line of the power supply, and the output ends of the first voltage detection channel, the second voltage detection channel and the third voltage detection channel are all connected to the input end of the control module. Specifically: the input end of the neutral line of the power supply is respectively connected to the input end of the first voltage detection channel and the output end of the neutral line of the power supply, so as to obtain the input voltage VN of the first voltage detection channel, and VN is also the voltage of the neutral line of the power supply; the live line of the power supply is respectively connected to the input end of the second voltage detection channel and one end of the fuse, so as to obtain the input voltage VL of the input end of the second voltage detection channel, and VL is also the voltage of the live line of the power supply and one end of the fuse; the other end of the fuse is connected to the input end of the third voltage detection channel and one end of the contact of the relay, so as to obtain the input voltage VF of the input end of the third voltage detection channel, and VF is the voltage of the other end of the fuse; the other end of the contact of the relay is connected to the output end of the live line of the power supply.

[0032] In this embodiment, if Figure 2As shown in the circuit diagram of the voltage detection channel, the first voltage detection channel, the second voltage detection channel and the third voltage detection channel are all electronic half-wave rectifier filter circuits with sampling function, which have the characteristics of high precision and high input impedance, and all include sampling resistor R1, voltage divider resistor R2, filter capacitor C, diode and operational amplifier, wherein the diode includes the first diode D1 and the second diode D2, and the operational amplifier includes the first operational amplifier OPA1 and the second operational amplifier OPA2, wherein the parameters of each component are: the filter capacitor C is 0.22uF, the first diode D1 and the second diode D2 are 1N4148, the first operational amplifier OPA1 and the second operational amplifier OPA2 are dual op amps TLV9152 IDR, the sampling resistor R1 is HVR82 / 50MΩ, the voltage divider resistor R2 is 1MΩ package 0805, and the second operational amplifier OPA2 is designed because the voltage divider resistor R2 is too large to directly drive the A / D of the microcontroller, so the second operational amplifier OPA2 forms a follower to drive the A / D of the microcontroller. Specifically: one end of the sampling resistor R1 is the voltage input end, and the other end of the sampling resistor R1 is respectively connected to one end of the voltage divider resistor R2, one end of the filter capacitor C, the positive electrode of the first diode D1 and the negative input end of the first operational amplifier OPA1, the positive input end of the first operational amplifier OPA1 is grounded, the output end of the first operational amplifier OPA1 and the negative electrode of the first diode D1 are commonly connected to the positive electrode of the second diode D2, the negative electrode of the second diode D2, the other end of the voltage divider resistor R2 and the other end of the filter capacitor C are commonly connected to the positive input end of the second operational amplifier OPA2, the negative input end of the second operational amplifier OPA2 is connected to the output end of the second operational amplifier OPA2 and serves as a voltage output end, and is connected to the input end of the control module.

[0033] In this embodiment, if Figure 1 As shown, the output end of the control module (single-chip microcomputer) is also electrically connected to the first LED power indicator light and the second LED power indicator light, respectively, for controlling the display of the first LED power indicator light and the second LED power indicator light, and the first LED power indicator light and the second LED power indicator light are both dual-color LED power indicator lights.

[0034] In this embodiment, if Figure 1 As shown, the relevant information can be transmitted through the communication of the microcontroller. When the grounding is good and the input voltage is normal, the relay is turned on. The values ​​of VN, VL, VF and the LED status can be sent through communication, and VLF, VNONE, VGND, VM IN, and VMAX can also be set through communication.

[0035] Embodiment 2

[0036] This embodiment provides a working method of an ultra-low frequency high voltage generator power supply indication device, based on an ultra-low frequency high voltage generator power supply indication device provided in Embodiment 1, specifically comprising:

[0037] In the control module (single-chip microcomputer), a first voltage threshold VLF for judging whether the fuse is blown is set in advance, a second voltage threshold VNONE for judging whether there is voltage, a third voltage threshold VGND for judging whether the grounding is bad, a fourth voltage threshold VM IN for judging whether the input voltage is too low, and a fifth voltage threshold VMAX for judging whether the input voltage is too high are set; wherein, in this embodiment, each voltage threshold is specifically set as: VLF = 10V, VNONE = 100V, VGND = 20V, VM IN = 200V, VMAX = 260V. After the input end of the control module obtains VN, VL and VF, the AD of the single-chip microcomputer judges VN, VL and VF with the above-mentioned various voltage thresholds. According to the judgment result, the IO port of the single-chip microcomputer controls the relay, the first LED power indicator and the second LED power indicator. Only when the grounding is good and the input voltage is normal, the relay is turned on to supply power to the subsequent circuit. The communication port of the single-chip microcomputer can send relevant status to the outside. The specific judgment is as follows:

[0038] When the fuse is blown, a voltage difference appears at both ends of the fuse. Whether the fuse is blown is determined by whether the voltage difference between VL and VF exceeds VLF. When VL and VN are both less than VNONE, it is determined that the input and output ends of the power supply are not grounded, which is considered to be poor grounding. When VL is greater than VNONE and VN is greater than VGND, it is determined that the corresponding power supply neutral line and power supply live line are not connected inversely, but it is considered to be poor grounding. When VL is greater than VGND and VN is greater than VNONE, it is determined that the corresponding power supply neutral line and power supply live line are connected inversely, which is also considered to be poor grounding. When VL is greater than VNONE and When VN is less than VGND, it is considered that the power neutral line and the power live line are not connected reversely, and the grounding is considered to be good; when VN is greater than VNONE and VL is less than VGND, it is considered that the power neutral line and the power live line are connected reversely, and the grounding is also considered to be good; then when the fuse blows, the first LED power indicator light and the second LED power indicator light go out; when the grounding is poor, the first LED power indicator light displays red, otherwise it displays green; when the input voltage is too low, the second LED power indicator light goes out, and when the input voltage is too high, the second LED power indicator light displays red, otherwise it displays green.

[0039] It should be noted that the microcontroller A / D pin setting, the control relay, the first LED power indicator light and the second LED power indicator light, and the microcontroller programming (setting various voltage thresholds) are all well-known and mature technologies.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power indicator device for an ultra-low frequency high voltage generator, characterized in that: include: A power supply module, a voltage detection channel and a control module; the input end of the voltage detection channel is connected to the power supply module, and the output end of the voltage detection channel is connected to the control module; The power module comprises a power neutral line, a power live line and a power ground line, wherein the power live line is provided with a fuse and a relay; the output end of the control module is electrically connected to the relay; The voltage detection channel includes a first voltage detection channel, a second voltage detection channel and a third voltage detection channel, wherein the input end of the first voltage detection channel is connected to the power neutral line, and the input ends of the second voltage detection channel and the third voltage detection channel are respectively connected to the two ends of the fuse.

2. The ultra-low frequency high voltage generator power supply indicating device according to claim 1, characterized in that: The input end of the power neutral line is respectively connected to the input end of the first voltage detection channel and the output end of the power neutral line to obtain the input voltage VN of the first voltage detection channel.

3. The ultra-low frequency high voltage generator power supply indicating device according to claim 1, characterized in that: The power ground wire in the power module is connected to the ground wire of the control module and the ground terminal of the power module respectively.

4. The ultra-low frequency high voltage generator power supply indicating device according to claim 1, characterized in that: The input end of the live wire of the power supply is respectively connected to one end of the fuse and the input end of the second voltage detection channel, the other end of the fuse is respectively connected to the input end of the third voltage detection channel and one end contact of the relay, and the other end contact of the relay is connected to the output end of the live wire of the power supply; and the input voltages of the second voltage detection channel and the third voltage detection channel are obtained, which are VL and VF respectively.

5. The ultra-low frequency high voltage generator power supply indicating device according to claim 1, characterized in that: The output ends of the first voltage detection channel, the second voltage detection channel and the third voltage detection channel are all connected to the input end of the control module.

6. The ultra-low frequency high voltage generator power supply indicating device according to claim 1, characterized in that: The output end of the control module is also electrically connected to a first LED power indicator light and a second LED power indicator light, respectively. The first LED power indicator light and the second LED power indicator light are both dual-color LED power indicator lights.

7. The ultra-low frequency high voltage generator power supply indicating device according to claim 1, characterized in that: The first voltage detection channel, the second voltage detection channel and the third voltage detection channel are all half-wave rectifier filter circuits with sampling function, and all include sampling resistors, voltage divider resistors, filter capacitors, diodes and operational amplifiers, wherein the diodes include a first diode and a second diode, and the operational amplifiers include a first operational amplifier and a second operational amplifier.

8. The ultra-low frequency high voltage generator power supply indicating device as claimed in claim 7, characterized in that: One end of the sampling resistor is a voltage input end, and the other end of the sampling resistor is respectively connected to one end of the voltage-dividing resistor, one end of the filter capacitor, the positive electrode of the first diode and the negative input end of the first operational amplifier. The positive input end of the first operational amplifier is grounded, the output end of the first operational amplifier and the negative electrode of the first diode are commonly connected to the positive electrode of the second diode, the negative electrode of the second diode, the other end of the voltage-dividing resistor and the other end of the filter capacitor are commonly connected to the positive input end of the second operational amplifier, the negative input end of the second operational amplifier is connected to the output end of the second operational amplifier and serves as a voltage output end, and is connected to the input end of the control module.

9. A working method of an ultra-low frequency high voltage generator power supply indication device, based on an ultra-low frequency high voltage generator power supply indication device according to any one of claims 1 to 8, characterized in that: include: A first voltage threshold VLF for judging whether the fuse is blown is set in the control module, a second voltage threshold VNONE for judging whether there is voltage, a third voltage threshold VGND for judging whether the grounding is bad, a fourth voltage threshold VMIN for judging whether the input voltage is too low, and a fifth voltage threshold VMAX for judging whether the input voltage is too high are set; when the fuse is blown, a voltage difference appears at both ends of the fuse, and whether the fuse is blown is judged by whether the voltage difference between VL and VF exceeds VLF; When both VL and VN are less than VNONE, it is judged that the input and output terminals of the power supply are not grounded, which is regarded as poor grounding; when VL is greater than VNONE and VN is greater than VGND, it is judged that the corresponding power supply neutral line and power supply live line are not reversed, but it is regarded as poor grounding; when VL is greater than VGND and VN is greater than VNONE, it is judged that the corresponding power supply neutral line and power supply live line are reversed, which is also regarded as poor grounding; when VL is greater than VNONE and VN is less than VGND, it is judged that the power supply neutral line and power supply live line are not reversed, which is regarded as good grounding; when VN is greater than VNONE and VL is less than VGND, it is judged that the power supply neutral line and power supply live line are reversed, which can also be regarded as good grounding; When the voltage difference between VL and VN is less than VMIN, the input voltage is considered to be too low; when the voltage difference between VL and VN is greater than VMAX, the input voltage is considered to be too high.

10. The working method of the ultra-low frequency high voltage generator power supply indicating device according to claim 9, characterized in that: When the fuse is blown, the first LED power indicator and the second LED power indicator are off; when the grounding is poor, the first LED power indicator displays red, otherwise it displays green; when the input voltage is too low, the second LED power indicator is off, and when the input voltage is too high, the second LED power indicator displays red, otherwise it displays green.

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