CN216870442U - On-line capacitance detection device for circuit system - Google Patents
On-line capacitance detection device for circuit system Download PDFInfo
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- CN216870442U CN216870442U CN202123065217.5U CN202123065217U CN216870442U CN 216870442 U CN216870442 U CN 216870442U CN 202123065217 U CN202123065217 U CN 202123065217U CN 216870442 U CN216870442 U CN 216870442U
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Abstract
An inline capacitance detection arrangement for circuitry is provided that includes a controller, a power supply, and a detector. The power supply and the detector are connected in parallel to two ends of the capacitor. And the controller is connected to the power supply and the detector and is used for controlling the power supply to provide voltage or current to the capacitor during the operation of the circuit system; and the detector is used for controlling to detect the voltage or current change on the capacitor to obtain a characteristic parameter value, and comparing the characteristic parameter value with a preset threshold value range to judge whether the capacitor is abnormal or not.
Description
Technical Field
The utility model relates to the technical field of capacitance detection, in particular to an on-line capacitance detection device for a circuit system.
Background
Capacitive elements are widely used in existing circuit systems, especially power systems, to stabilize voltage, filter noise, and store energy. In a circuit system, in order to ensure reliable operation of a load, the aging degree of a capacitor needs to be detected and observed in real time so as to avoid adverse effects on the circuit system or the load, such as capacitor damage or explosion caused by capacitor aging.
In the conventional capacitance detection method, the circuit system is required to be shut down firstly, then the capacitance in the circuit system is tested, and the normal operation of the circuit system is recovered after the test is finished. However, frequently turning off the circuitry adversely affects the circuitry and its load and reduces the efficiency of use of the circuitry. In addition, in some circuit systems that require continuous operation, the capacitance in the circuit system cannot be detected in a static manner.
SUMMERY OF THE UTILITY MODEL
In accordance with the above-mentioned drawbacks of the prior art, the present invention provides an in-line capacitance detection apparatus for a circuit system, the apparatus including a controller, a power supply, and a detector, the power supply and the detector being connected in parallel to two ends of the capacitance; and the controller is connected to the power supply and the detector, and is used for controlling the power supply to supply voltage or current to the capacitor in the operation process of the circuit system, and controlling the detector to detect the voltage or current change on the capacitor to obtain a characteristic parameter value, and comparing the characteristic parameter value with a preset threshold range to judge whether the capacitor is abnormal or not.
Preferably, the characteristic parameter value is a capacitance value, and the controller controls the power supply to supply a predetermined voltage or current to the capacitor during a first period of time, and controls the detector to detect a change value of the voltage across the capacitor during the first period of time, so as to calculate the capacitance value.
Preferably, the characteristic parameter value is a capacitance value, and the controller controls the power supply to charge the capacitor to a predetermined first voltage value and discharge the capacitor to a predetermined second voltage value in a second time period to calculate the capacitance value.
Preferably, the controller controls the power supply to charge the capacitor to a predetermined first voltage value and discharge the capacitor to a predetermined second voltage value within a second time period, and the characteristic parameter value is a current test time at which the capacitor is discharged to the second voltage value.
Preferably, the characteristic parameter value is a capacitance value, and the detector is connected to an input branch and an output branch of the capacitor and is configured to measure a current of the input branch, a current of the output branch, and a voltage of the output branch to calculate the capacitance value.
Preferably, the controller controls the power supply to supply an alternating current to the capacitor, and controls the detector to detect a current of the input branch, a current of the output branch and a voltage of the output branch so as to calculate the capacitance value.
Preferably, the power supply is a power supply internal to the circuitry, the controller is a controller internal to the circuitry and the detector is a detector internal to the circuitry.
Preferably, the circuitry is an uninterruptible power supply, the capacitor is a DC bus capacitor, and the power source is at least one of a rectifier, a DC-DC converter, and a pre-charge line in the uninterruptible power supply.
The present invention also provides a circuit system, comprising:
a capacitor; and
the above-described inline capacitance detection apparatus for a circuit system.
Preferably, the circuit system is an uninterruptible power supply, a server power supply, a network energy source, a high-power charger, a charging pile or a vehicle-mounted charger.
The on-line capacitance detection device can detect the capacitance in the circuit system during the operation of the circuit system, and comprises direct current capacitance, alternating current capacitance or any other type of capacitance. The on-line capacitance detection device can detect and predict the aging degree of the capacitance in real time, provide data for technical engineers or customers to easily evaluate the state of the product and easily maintain the product, and avoid the adverse effects on a circuit system or a load caused by the damage or explosion of the capacitance and the like caused by the aging of the capacitance.
Drawings
FIG. 1 illustrates an operational architecture diagram of a UPS device;
FIG. 2 illustrates a schematic diagram of an inline capacitance detection arrangement for use in a UPS, in accordance with one embodiment of the present invention;
FIG. 3 shows a schematic diagram of an inline capacitance detection arrangement for use in a UPS in accordance with another embodiment of the present invention;
FIG. 4 shows a schematic diagram of an inline capacitance detection arrangement for server power supplies, according to one embodiment of the present invention;
FIG. 5A shows a schematic diagram of an inline capacitance detection arrangement for an output of a UPS, in accordance with one embodiment of the present invention;
FIG. 5B shows a schematic diagram of an inline capacitance detection arrangement for an output of a UPS in accordance with another embodiment of the utility model;
FIG. 6A shows a schematic diagram of an in-line capacitance detection arrangement for an input of a UPS in accordance with one embodiment of the present invention; and
FIG. 6B shows a schematic diagram of an inline capacitance detection arrangement for an input of a UPS in accordance with another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail by embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The utility model provides an on-line capacitance detection device for a circuit system, which can be used for controlling an internal or external power supply to charge or discharge a capacitor in the circuit system through a controller in the operation process of the circuit system so as to disturb the voltage or current on the capacitor, thereby evaluating the aging degree of the capacitor. In the present invention, the term "on line" refers to that when measuring capacitance in a circuit system, the circuit system does not need to be turned off and can be always in an on-line operation state.
The on-line capacitance detection device can be applied to any circuit system needing capacitance detection. Preferably, the On-line capacitance detection device of the present invention may be applied to a Power Supply system, including but not limited to an Uninterruptible Power Supply (UPS), a Server Power Supply (Server Power), a Network Power source (Network Power), a High Power Charger (High Power Charger), an electric charging pile (EV charge), an On-board Charger (On-board charge), and the like. For convenience of explanation, the following description will be given by taking a UPS as an example, but the present invention is not limited thereto, and other circuit systems may also apply the detection apparatus of the present invention.
Fig. 1 is a schematic diagram of an operating architecture of a UPS apparatus, and as shown in fig. 1, a UPS generally includes a power factor corrector (rectifier) 101, an inverter 102, a battery 103, a DC-DC converter 104, and a static bypass. When the commercial power is input normally, the UPS is equivalent to a voltage stabilizer, and the rectifier 101 can be used to rectify the commercial power into direct current, and then the inverter 102 is used to invert the direct current into stable and impurity-free alternating current, which is output to the load 105 for use. When the ac input of the utility power is abnormal, for example, a fault such as undervoltage or power failure occurs, the UPS may start the battery 103, turn off the rectifier circuit where the rectifier 101 is located, and accordingly, invert the DC power of the battery into a stable and contaminant-free ac power by using the DC-DC converter 104 and the inverter 102, and supply the stable and contaminant-free ac power to the subsequent load 105. Static bypass may be used to close static switch 107 to directly deliver mains power to load 105 for power supply when the UPS is not operating, such as at sleep or in the event of a fault. The UPS of fig. 1 also includes a pre-charge line 106 for establishing a voltage on a direct current bus (DC bus) when the UPS is initially operating, preventing large currents from being generated in the rectifier 101. It should be noted that in fig. 1, the connection between the pre-charge line 106 and the dc bus is shown by a dotted line, which is only for clarity of illustration and is not intended to limit the present invention, as is the case with other figures of the present invention.
A plurality of dc bus capacitors 108 are connected in parallel between the positive and negative dc buses between the rectifier 101 and the inverter 102 of the UPS, and the dc bus capacitors 108 are used for stabilizing voltage, filtering noise, storing energy, removing dc components, and the like. The aging of the dc bus capacitor 108 may adversely affect the UPS power supply, for example, the capacitor 108 may be damaged or exploded, thereby destroying the UPS power supply.
According to one embodiment of the utility model, the dc bus capacitance 108 may be charged or discharged to evaluate the aging of the dc bus capacitance 108. The current-voltage relationship during the capacitor charging process can be referred to equation 1:
Qc＝Ic×tc＝C×ΔVcequation 1
Wherein Q iscIs the amount of charge, IcAt a predetermined charging current, tcFor the charging time, C is the capacitance of the capacitor, Δ VcIs the change of the voltage across the capacitor during the charging process. Due to charging current IcIs generally fixed and, therefore, is charged for a certain time tcBy measuring Δ VcThe current capacitance value C can be obtained.
The current-voltage relationship during the discharge of the capacitor can be referred to equation 2:
wherein E isdTo start the discharge, the voltage across the capacitor, tdFor discharge time, VdTo discharge tdThe voltage across the capacitor after the time. The time constant τ is R × C, C is a capacitance value, and R is a resistance value in the circuit. According to equation 2, at a certain discharge time tdBy measuring VdCan obtain the current valueA capacitance value C. Or can be observed from EdDown to VdTo evaluate the capacitance value C.
Fig. 2 is a schematic diagram of an inline capacitance detection arrangement for use in a UPS, according to one embodiment of the utility model. Which is a dc bus capacitor 108 and can be detected during normal operation of the UPS. The inline capacitance detection arrangement includes a controller 109, a power supply 110, and a detector 111. The power source 110 and the detector 111 are connected in parallel to two ends of the capacitor 108; the controller 109 is connected to the power source 110 and the detector 111, and is configured to control the power source 110 to provide an output voltage or current to the capacitor 108, and control the detector 111 to detect a change in the voltage or current on the capacitor 108 to determine whether the capacitor 108 is abnormal. The detector 111 transmits the detection result to the controller 109, and the controller 109 may determine whether the capacitor 108 is abnormal according to the detection result, and if the controller 109 determines that the capacitor 108 is in an abnormal state, the controller may issue an alarm indicating that the capacitor is abnormal, and control the UPS to stop operating. The on-line capacitance detecting device may further include a display unit (not shown) for outputting the detection result of the detector 111 and the judgment result of the controller 109 to a user.
According to an embodiment of the present invention, the controller 109 may first control the detector 111 to detect the voltage V across the capacitor 1081Then, the controller 109 controls the power source 110 to charge the capacitor 108 with a predetermined power (voltage or current) for a time tcThereafter, the controller 109 controls the power supply 110 to stop charging, and controls the detector 111 to detect the voltage V across the capacitor 1082Voltage difference Δ Vc＝V2-V1And a capacitance value is calculated according to equation 1. When the UPS is in operation, the UPS is powered through the line of the commercial power-rectifier 101-inverter 102-load 105, and the fixed voltage V is already on the direct current busbusI.e. V1＝Vbus。
According to another embodiment of the present invention, the controller 109 may first control the power source 110 to have a predetermined voltage EdIs connected to the capacitor 108 such that the voltage across the capacitor 108 rises to EdThen the controller 109 controls the power supply 110 to be turned off and the voltage across the capacitor 108 to be reducedVoltage from EdDischarging is performed, and the control detector 111 detects the voltage across the capacitor 108 and records the voltage drop to VdTime t elapseddThe capacitance value is calculated according to equation 2. When the UPS is in operation, the UPS supplies power through a line of the commercial power-rectifier 101-the inverter 102-the load 105, and a fixed voltage V is arranged on a direct current bus at the momentbusTherefore, the voltage across the capacitor 108 does not rise from 0V to EdBut from VbusIs raised to Ed。
According to another embodiment of the utility model, the slave voltage E is detected at the factory shipment of the UPSdDischarge to voltage VdElapsed factory test time. During the operation of the UPS, the slave voltage E can be detected in real timedDischarge to voltage VdAnd comparing the current testing time with the factory testing time or the previously measured historical testing time to judge whether the capacitor is abnormal. If the difference between the current test time and the historical test time or the factory test time is larger than a certain range, the capacitor can be considered to be abnormal. Or a preset test time range can be set according to factory test time, historical test time or experience, and if the current test time exceeds the preset test time range, the capacitor is considered to be abnormal.
The controller 109 may be a controller inside the UPS power system, or may be an external controller. The detector 111 may be a detector inside the UPS power system, or may be an external detector. The power source 110 may be an internal power source of the UPS power system or an external power source.
Fig. 3 is a schematic diagram of an inline capacitance detection arrangement for use in a UPS, according to another embodiment of the utility model. In this embodiment, the power supply is a power supply internal to the UPS, such as rectifier 101, DC-DC converter 104, and pre-charge line 106. The controller 109 is a controller internal to the UPS and the detector 111 is a detector (e.g., ADC feedback) internal to the UPS. The controller 109 may be connected to the rectifier 101, the DC-DC converter 104, and the pre-charge line 106, respectively. When the capacitor 108 needs to be charged, at least one of the rectifier 101, the DC-DC converter 104, and the pre-charge line 106 may be controlled by the controller 109 to charge the capacitor 108. The specific charging and discharging processes are the same as those in the embodiment of fig. 2, and are not described herein again.
Preferably, the capacitance can be measured in a bypass mode, where the capacitance measurement is not affected because the inverter 102 is not operating. The capacitance may also be measured during the power mode of inverter 102, and due to the presence of inverter 102, charging and discharging capacitor 108 may not affect load 105. In order to make the capacitance measurement result more accurate, when the capacitance 108 is measured under the condition that the inverter 102 is in the working state, the change of the current in the inverter 102 can be accurately simulated through an algorithm, so that the influence of the inverter 102 on the discharge of the capacitance 108 is compensated, and the more accurate measurement result is obtained.
The on-line capacitance detection device can also be applied to other power supply systems. FIG. 4 shows a schematic diagram of an inline capacitance detection arrangement for server power supply, according to one embodiment of the present invention. The server power supply includes a power factor corrector (rectifier) 401 and a DC-DC converter 402. The commercial power is converted into direct current after passing through a rectifier 401 and a DC-DC converter 402 and provided to a load 403. The on-line capacitance detection device of the present invention can detect the capacitance 404 between the positive and negative DC buses between the rectifier 401 and the DC-DC converter 402. The inline capacitance detection arrangement includes a controller 405, a power supply 406, and a detector 407. The power source 406 and the detector 407 are connected in parallel to two ends of the capacitor 404; the controller 405 is connected to the power source 406 and the detector 407, and is used for controlling the power source 406 to provide an output voltage or current to the capacitor 404, and controlling the detector 407 to detect a change in the voltage or current on the capacitor 404 to determine whether the capacitor 404 is abnormal. The detector 407 transmits the detection result to the controller 405, and the controller 405 may determine whether the capacitor 404 is abnormal according to the detection result, and if the controller 405 determines that the capacitor 404 is in an abnormal state, the controller may issue an alarm indicating that the capacitor is abnormal, and control the server power supply to stop operating. The on-line capacitance detecting device may further include a display unit (not shown) for outputting the detection result of the detector 407 and the determination result of the controller 405 to a user. The operation mode of the on-line capacitance detection apparatus in this embodiment is the same as that in the embodiment shown in fig. 2, and is not described herein again.
Although the two-stage switching power supply architecture is exemplified in the above embodiments, the utility model is not limited thereto, and any circuit system may be applied to the on-line capacitance detection apparatus of the utility model. In the above embodiments, the on-line capacitance detecting device charges or discharges the capacitor by supplying a voltage or a current to the capacitor, and detects a voltage change on the capacitor, thereby calculating a capacitance value to evaluate the degree of aging of the capacitor. In some application scenarios, however, the capacitance cannot be charged or discharged, and the capacitance can be evaluated based on the change in impedance of the capacitance in the frequency domain.
FIG. 5A shows a schematic diagram of an inline capacitance detection arrangement for an output of a UPS according to one embodiment of the present invention. The output of the UPS includes an inverter 505, a capacitor 501, and a load 506, and the inverter 505 outputs an ac current to the load 506. The current on the input branch of the capacitor 501 is ILThe current on the output branch is IO. The inline capacitance detection device includes a controller 502, a power supply 503, and a detector 504. Wherein, the power source 503 is connected in parallel to two ends of the capacitor 501; the detector 504 is connected to the input branch and the output branch of the capacitor 501; and a controller 502 connected to the power source 503 and the detector 504 for controlling the power source 503 to provide an output voltage or current to the capacitor 501 and controlling the detector 504 to detect the current I on the input branchLCurrent I on the output branchOAnd the voltage Vo on the output branch to determine whether the capacitor 501 is abnormal. The detector 504 transmits the detection result to the controller 502, and the controller 502 can determine whether the capacitor 501 is abnormal according to the detection result, and if the controller 502 determines that the capacitor 501 is in an abnormal state, the controller can issue an alarm of the abnormal capacitor and control the circuit system to stop operating. The on-line capacitance detecting device may further include a display unit (not shown) for outputting the detection result of the detector 504 and the determination result of the controller 502 to a user.
In this embodiment, since the capacitance 501 is aged to cause the capacitance impedance in the frequency domain to change, the aging degree of the capacitance can be evaluated by measuring the difference between the currents in the input branch and the output branch. In particular, in the frequency domain,
wherein, XcIs the capacitive reactance, f is the frequency of the input alternating current, c is the capacitance value. From ohm's law it can be derived:
Vo∠φ1＝(IL∠φ2-Io∠φ3)＊Xcequation of-90
Where Vo is the output voltage, [ phi ]1To angle of the output voltage, [ phi ]2For the current I on the input branchLAngle of (phi)3For the current I on the output branchOThe angle of (c). Substituting equation 3 into equation 4 yields:
therefore, the capacitance value can be calculated by measuring the current of the input branch and the output branch and the voltage of the output branch, so as to evaluate the aging degree of the capacitor.
In the present embodiment, the capacitor 501 is usually an ac capacitor, the power source 503 is usually an ac power source, and it may be a power source inside the circuit system or an external power source, and the external power source 503 will be described as an example below. The controller 502 controls the power supply 503 to input current into the circuitry and controls the detector 504 to detect the current I of the input branchLCurrent I of the output branchOAnd the voltage Vo of the output branch, and the capacitance value of the capacitor 501 is calculated according to the above equation 5, so as to evaluate the aging degree of the capacitor 501.
FIG. 5B shows a schematic diagram of an inline capacitance detection arrangement for an output of a UPS according to another embodiment of the utility model. This embodiment is substantially the same as the embodiment of fig. 5A, except that the power supply in this embodiment is an internal power supply. The controller controls the inverter 504 to provide an output voltage or current to the capacitor 501, and the operation mode is the same as that of the embodiment of fig. 5A, which is not described herein again.
In the embodiments of fig. 5A-5B, during the process that the inverter 505 normally supplies power to the load 506, the controller 502 may not be used to control the power source 503 or the inverter 505 to supply voltage or current to the capacitor 501, and the controller 502 may directly control the detector 504 to detect the current I of the input branchLCurrent I of the output branchOAnd the voltage Vo of the output branch, and the capacitance value of the capacitor 501 is calculated according to the above equation 5, so as to evaluate the aging degree of the capacitor 501.
FIG. 6A shows a schematic diagram of an inline capacitance detection arrangement for an input of a UPS in accordance with one embodiment of the present invention. The input of the UPS comprises mains, a capacitor 601 and a rectifier 605, the mains outputting an alternating current to the rectifier 605. The current on the input branch of the capacitor 601 is ILThe current on the output branch is IO. The inline capacitance detection arrangement includes a controller 602, a power supply 603, and a detector 604. The power supply 603 is connected in parallel to two ends of the capacitor 601; the detector 604 is connected to the input branch and the output branch of the capacitor 601; and a controller 602 connected to the power source 603 and the detector 604 for controlling the power source 603 to provide an output voltage or current to the capacitor 601 and controlling the detector 604 to detect the current I on the input branchLCurrent I on the output branchOAnd the voltage Vo on the output branch to determine whether the capacitor 501 is abnormal. The operation mode is the same as that of the embodiment of fig. 5A, and is not described herein again.
FIG. 6B shows a schematic diagram of an inline capacitance detection arrangement for an input of a UPS in accordance with another embodiment of the present invention. This embodiment is substantially the same as the embodiment of fig. 6A, except that the power supply in this embodiment is an internal power supply. The controller 602 controls the commercial power to provide an output voltage or current to the capacitor 601, and the operation mode is the same as that of the embodiment shown in fig. 5A, which is not described herein again.
In the embodiment of fig. 6A-6B, when the UPS is operating in inverter mode, i.e., via the mains-rectifierWhen the inverter-load route supplies power to the load, the controller 602 may not be used to control the power supply 603 or the commercial power to supply voltage or current to the capacitor 601, and the controller 602 may directly control the detector 604 to detect the current I of the input branchLCurrent I of the output branchOAnd the voltage Vo of the output branch, and the capacitance value of the capacitor 601 is calculated according to the above equation 5, so as to evaluate the aging degree of the capacitor 601.
According to one embodiment of the present invention, the controller may be a microprocessor, a programmable logic device, a single chip, or the like. The power source may be any dc or ac power source. And the detector may be an ADC detector capable of detecting a voltage or a current, it should be noted that the detector may also comprise a plurality of voltage or current detectors for detecting a voltage or a current, respectively.
In the above embodiments of the present invention, the controller may be a controller inside the circuit system, or may be an external controller. The detector can be a detector inside the circuit system or an external detector. The power supply can be a power supply inside the circuit system or an external power supply.
In summary, the present invention provides an on-line capacitance detection apparatus for a circuit system, the apparatus includes a controller, a power supply and a detector, the power supply and the detector are connected in parallel to two ends of the capacitor; and the controller is connected to the power supply and the detector, and is used for controlling the power supply to supply voltage or current to the capacitor in the operation process of the circuit system, and controlling the detector to detect the voltage or current change on the capacitor to obtain a characteristic parameter value, and comparing the characteristic parameter value with a preset threshold range to judge whether the capacitor is abnormal or not. The characteristic parameter value may be a capacitance value, and the predetermined threshold range refers to a range of a predetermined capacitance value, and a capacitance value exceeding the range is determined to be abnormal; the characteristic parameter value may also be a current test time for discharging the capacitor from a predetermined first voltage value to a predetermined second voltage value, where the predetermined threshold range refers to a previously measured historical test time or a predetermined test time range, and a capacitor is determined to be abnormal if the value exceeds the previously measured historical test time range or the predetermined test time range.
The on-line capacitance detection device can detect the capacitance in the circuit system during the operation of the circuit system, and comprises direct current capacitance, alternating current capacitance or any other type of capacitance. In the operation process of a circuit system, the capacitor has certain voltage or current, and the controller controls an internal or external power supply to provide additional voltage or current to the capacitor so as to disturb the voltage or current on the capacitor, so that whether the capacitor is abnormal or not is judged according to the detected voltage or current change on the capacitor
The online capacitance detection device can detect and predict the aging degree of the capacitance in real time, provide data for technical engineers or customers to easily evaluate the state of the product and easily maintain the product, and avoid the adverse effects on a circuit system or a load caused by the damage or explosion of the capacitance and the like caused by the aging of the capacitance.
Although the present invention has been described by way of preferred embodiments, the present invention is not limited to the embodiments described herein, and various changes and modifications may be made without departing from the scope of the present invention.
Claims (10)
1. An in-line capacitance detection device for a circuit system, the device comprising a controller, a power supply and a detector, the power supply and the detector being connected in parallel to two ends of the capacitance; and the controller is connected to the power supply and the detector, and is used for controlling the power supply to supply voltage or current to the capacitor in the operation process of the circuit system, and controlling the detector to detect the voltage or current change on the capacitor to obtain a characteristic parameter value, and comparing the characteristic parameter value with a preset threshold range to judge whether the capacitor is abnormal or not.
2. The on-line capacitance detection device for circuit system as claimed in claim 1, wherein the characteristic parameter value is a capacitance value, the controller controls the power supply to supply a predetermined voltage or current to the capacitance during a first time period, and controls the detector to detect a variation value of the voltage across the capacitance during the first time period to calculate the capacitance value.
3. The on-line capacitance detection device for circuitry as claimed in claim 1, wherein the characteristic parameter value is a capacitance value, and the controller controls the power supply to charge the capacitance to a predetermined first voltage value and discharge the capacitance to a predetermined second voltage value during a second time period to calculate the capacitance value.
4. The on-line capacitance detection device for circuitry of claim 1, wherein the controller controls the power supply to charge the capacitance to a predetermined first voltage value and discharge the capacitance to a predetermined second voltage value for a second time period, and the characteristic parameter value is a current test time at which the capacitance is discharged to the second voltage value.
5. The on-line capacitance detection device for circuit system as claimed in claim 1, wherein said characteristic parameter value is a capacitance value, and said detector is connected to an input branch and an output branch of said capacitor for measuring a current of said input branch, a current of said output branch and a voltage of said output branch to calculate said capacitance value.
6. The on-line capacitance detection device for circuit system as claimed in claim 5, wherein the controller controls the power supply to supply an alternating current to the capacitor and controls the detector to detect the current of the input branch, the current of the output branch and the voltage of the output branch to calculate the capacitance value.
7. The in-line capacitance detection device for circuitry of any of claims 1-6, wherein the power source is a power source internal to the circuitry, the controller is a controller internal to the circuitry and the detector is a detector internal to the circuitry.
8. The in-line capacitance detection device for circuitry as recited in any of claims 1-6, wherein the circuitry is an uninterruptible power supply, the capacitance is a direct current bus capacitance, and the power source is at least one of a rectifier, a DC-DC converter, and a pre-charge line in the uninterruptible power supply.
9. A circuit system, comprising:
a capacitor; and
the in-line capacitance detection apparatus for circuitry of any of claims 1-8.
10. The circuitry of claim 9, wherein the circuitry is an uninterruptible power supply, a server power supply, a network power source, a high power charger, a charging post, or an on-board charger.
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|---|---|---|---|
| CN202123065217.5U CN216870442U (en) | 2021-12-08 | 2021-12-08 | On-line capacitance detection device for circuit system |
| TW111146674A TW202323850A (en) | 2021-12-08 | 2022-12-06 | On-line capacitance detection device for circuit system |
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| CN202123065217.5U CN216870442U (en) | 2021-12-08 | 2021-12-08 | On-line capacitance detection device for circuit system |
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