CN114325059A - High-power direct current bus detection device - Google Patents
High-power direct current bus detection device Download PDFInfo
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- CN114325059A CN114325059A CN202210021620.8A CN202210021620A CN114325059A CN 114325059 A CN114325059 A CN 114325059A CN 202210021620 A CN202210021620 A CN 202210021620A CN 114325059 A CN114325059 A CN 114325059A
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- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims abstract description 8
- 230000003247 decreasing effect Effects 0.000 claims description 4
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- 230000005674 electromagnetic induction Effects 0.000 abstract description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The invention discloses a high-power direct-current bus detection device which comprises a three-phase power input and DC output unit, a weak-current input unit, a rectifier, a reactor unit, a DC _ link capacitor, a power reference chip, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the output end of the three-phase power input and DC output unit is connected with the rectifier, the output end of the weak-current input unit is connected with the power reference chip, the rectifier is electrically connected with the reactor unit, the reactor unit is electrically connected with the DC _ link capacitor, the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are electrically connected, and the power reference chip is electrically connected with the resistor R1, the resistor R2, the resistor R3 and the resistor R4. The invention collects large current based on magnetic components, calculates the number of turns of the secondary side according to a certain proportion by an electromagnetic induction principle, and obtains the relationship between the large current and the collected voltage.
Description
Technical Field
The invention relates to the technical field of direct current bus detection, in particular to a high-power direct current bus detection device.
Background
Current motor drives, mostly using ac-dc-ac main topology; however, in most control loops, the load at the rear end varies variously, and abnormal situations such as short circuit of the load are easy to occur; causing damage to the motor drive; in order to avoid the large current at the back end to damage the driver or other peripheral equipment, a reliable current detection device is necessary; moreover, the common controller needs to flow a large current; therefore, a reliable high-current direct-current bus detection device becomes a better choice.
The existing direct current bus detection equipment has the following defects:
1. patent document CN210405138U discloses a MOS transistor driving motor device, "including transistor Q43, transistor Q44, diode D02, MOS transistor Q01 and MOS transistor Q02, MOS transistor Q03 and MOS transistor Q04, the anode of diode D02 is connected to a dc power supply, the cathode of diode D02 is connected to resistor R33, the drain of MOS transistor Q01, the drain of MOS transistor Q02 and resistor R34, the other end of resistor R33 is connected to the gate of MOS transistor Q01, the collector of transistor Q43 and the gate of MOS transistor Q03, the other end of resistor 34 is connected to the gates of MOS transistors Q02 and Q04 and the collector of transistor Q44", the utility model discloses a MOS transistor driving motor device with simple and stable structure, cost saving, and solving the phenomena of poor contact of a relay and no separation after contact, and the MOS transistor driving motor device has a good effect for 3 years on our 12V gas alarm (combustible gas detector), and a lot of cost saving, the device collects current by utilizing the voltage drop of the Mos tube, and although the sampling resistance is reduced, the Mos tube per se has higher loss, so that the use cost of the device is higher;
2. patent document CN211656111U discloses a MOS transistor switch circuit, "the MOS transistor switch circuit includes a MOS transistor Q1, a triode Q2 and a voltage regulator D1; the collector of the triode Q2 is respectively connected with the power input end V _ IN and the grid of the MOS tube Q1, the emitter of the triode Q2 is grounded, and the base of the triode Q2 is connected with the control signal end ON _ OFF _ SWITCH; the source electrode of the MOS tube Q1 is connected with the power supply input end V _ IN, and the drain electrode of the MOS tube Q1 is connected with the power supply output end V _ OUT; the voltage regulator D1 is connected across the source and gate of the MOS transistor Q1. The MOS tube switching circuit can avoid the risk of MOS tube damage caused by system voltage fluctuation, the normal work of the circuit is not influenced in the whole process from voltage fluctuation to stable state recovery, and output harmonic waves exist during the work of the circuit, so that the reliability of the circuit is lower;
3. patent document CN213186071U discloses a power supply MOS switch circuit, device and electronic equipment, "the circuit includes: when receiving the high-level electric signal output by the second switch control signal end, the second-stage MOS switch module conducts a path between the power supply input end and the overcurrent protection module so that the overcurrent protection module stores the charging electric energy input by the power supply input end; and the primary MOS switch module receives the high-level electric signal output by the first switch control signal end when the current storage voltage of the overcurrent protection module is equal to the power supply voltage of the power supply input end, and switches on a channel between the power supply input end and the power supply output end according to the high-level electric signal so as to output electric energy. Compared with the prior art, the secondary MOS switch module and the overcurrent protection module are additionally arranged, so that the impact current borne in the MOS tube opening process is slowed down, the MOS tube is prevented from being burnt out due to heating, the safety of the power switch is improved, and the device cannot accurately acquire the magnitude of the rear-end current to ensure the rear-end control when in use, so that the rear-end protection performance of the device is poor.
Disclosure of Invention
The invention aims to provide a high-power direct-current bus detection device to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a high-power direct-current bus detection device comprises a three-phase power input and DC output unit, a weak-current input unit, a rectifier, a reactor unit, a DC _ link capacitor, a power reference chip, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the output end of the three-phase power input and DC output unit is connected with the rectifier, the output end of the weak-current input unit is connected with the power reference chip, the rectifier is electrically connected with the reactor unit, the reactor unit is electrically connected with the DC _ link capacitor, the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are electrically connected, the power reference chip is electrically connected with the resistor R1, the resistor R2, the resistor R3 and the resistor R4, the rectifier is electrically connected with a relay and a freewheeling diode, and the relay is electrically connected with the freewheeling diode.
Preferably, the detection device comprises the following working steps:
s1, enabling large current to flow through the reactor unit, and enabling the large current to be mutually induced to the secondary side to form V1;
s2, the initial V1 is lower than the non-inverting terminal V + of the comparator, Vout is Vcc;
s3, where V + (R3 Vcc + (R2+ R4) × Vref ]/(R2+ R3+ R4), V1 rises with increasing current;
s4, if V1> V +, that is, V1> [ R3+ Vcc + (R2+ R4) > Vref ]/(R2+ R3+ R4), Vout is 0V, at this time, V + (Vref) R4/(R3+ R4), and when the current exceeds a certain value, the relay LAY1 is turned off, and the current value is decreased;
s5, when V1< V +, i.e. V1< Vref × R4/(R3+ R4), Vout is Vcc, thus 1-6 is a complete cycle;
the S6 and the L1 can be used as a mutual inductor to accurately detect the flowing current, when the L1 is used as a reactor, the device can separate the noise on DC and three-phase input, the EMI is reduced, and meanwhile, a stable power supply is provided for the control of the back end.
Preferably, the reactor unit may be replaced by a transformer unit.
Preferably, the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are all conventional resistors.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the large current is collected on the basis of the magnetic component, the number of turns of the secondary side is calculated according to a certain proportion by an electromagnetic induction principle, and the relationship between the large current and the collected voltage is obtained, so that the use cost of the device is lower than that of a Mos tube with the large current, and the use cost of the device is further reduced.
2. According to the invention, from the perspective of energy, a mutual inductor or a reactor is added in a circuit of the device, so that the power quality of the device is improved, the mutual inductor can accurately detect the current flowing through the device, the current stability is ensured, when the reactor is used, the reactor can separate the noise on DC from three-phase input, the EMI is reduced, and meanwhile, a stable power supply is provided for the control of the rear end.
3. The invention is a good protection device for the rear-end control part, no matter the frequency converter or the servo driver, and reduces the probability of damage of the control part.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic structural diagram of a point a in fig. 1.
In the figure: j1 is a three-phase power input and DC output unit of the device;
j2 is a weak current input unit of the device;
b1: a rectifier;
LAY1, relay;
d2: a freewheeling diode of the relay;
l1 is a reactor or a transformer unit;
cl: is a DC _ link capacitor;
z1: a power supply reference chip;
r1, R2, R3 and R4 are resistors.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
Referring to fig. 1, an embodiment of the present invention: a high-power direct-current bus detection device comprises a three-phase power input and DC output unit, a weak-current input unit, a rectifier, a reactor unit, a DC _ link capacitor, a power reference chip, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the output end of the three-phase power input and DC output unit is connected with the rectifier, the output end of the weak-current input unit is connected with the power reference chip, the rectifier is electrically connected with the reactor unit, the reactor unit is electrically connected with the DC _ link capacitor, the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are electrically connected, the power reference chip is electrically connected with the resistor R1, the resistor R2, the resistor R3 and the resistor R4, the rectifier is electrically connected with a relay and a freewheeling diode, and the relay is electrically connected with the freewheeling diode.
The detection device comprises the following working steps:
s1, enabling large current to flow through the reactor unit, and enabling the large current to be mutually induced to the secondary side to form V1;
s2, the initial V1 is lower than the non-inverting terminal V + of the comparator, Vout is Vcc;
s3, where V + (R3 Vcc + (R2+ R4) × Vref ]/(R2+ R3+ R4), V1 rises with increasing current;
s4, if V1> V +, that is, V1> [ R3+ Vcc + (R2+ R4) > Vref ]/(R2+ R3+ R4), Vout is 0V, at this time, V + (Vref) R4/(R3+ R4), and when the current exceeds a certain value, the relay LAY1 is turned off, and the current value is decreased;
s5, when V1< V +, i.e. V1< Vref × R4/(R3+ R4), Vout is Vcc, thus 1-6 is a complete cycle;
s6, when the L1 is used as a reactor, the device can separate DC noise from three-phase input, reduce EMI and provide a stable power supply for back-end control.
The resistor R1, the resistor R2, the resistor R3 and the resistor R4 are all conventional resistors.
Example two
Referring to fig. 1, an embodiment of the present invention: the utility model provides a high-power direct current bus detection device, includes three-phase electricity input and DC output unit, weak current input unit, rectifier, mutual-inductor unit, DC _ link electric capacity, power benchmark chip, resistance R1, resistance R2, resistance R3 and resistance R4, three-phase electricity input and DC output unit's output is connected with the rectifier, weak current input unit's output is connected with power benchmark chip, rectifier and mutual-inductor unit electric connection, mutual-inductor unit and DC _ link electric capacity electric connection, resistance R1, resistance R2, resistance R3 and resistance R4 electric connection, power benchmark chip and resistance R1, resistance R2, resistance R3 and resistance R4 electric connection, rectifier electric connection has relay and freewheeling diode, relay and freewheeling diode electric connection.
The detection device comprises the following working steps:
s1, enabling a large current to flow through the mutual inductor unit, and enabling the mutual inductor unit to be mutually inducted to the secondary side to form a V1;
s2, the initial V1 is lower than the non-inverting terminal V + of the comparator, Vout is Vcc;
s3, where V + (R3 Vcc + (R2+ R4) × Vref ]/(R2+ R3+ R4), V1 rises with increasing current;
s4, if V1> V +, that is, V1> [ R3+ Vcc + (R2+ R4) > Vref ]/(R2+ R3+ R4), Vout is 0V, at this time, V + (Vref) R4/(R3+ R4), and when the current exceeds a certain value, the relay LAY1 is turned off, and the current value is decreased;
s5, when V1< V +, i.e. V1< Vref × R4/(R3+ R4), Vout is Vcc, thus 1-6 is a complete cycle;
s6, when the L1 is used as a mutual inductor, the current flowing through the mutual inductor can be accurately detected and timely adjusted, and therefore a stable power supply is provided for control of the rear end.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (4)
1. The utility model provides a high-power direct current bus detection device, includes three-phase electricity input and DC output unit, weak current input unit, rectifier, reactor unit, DC _ link electric capacity, power benchmark chip, resistance R1, resistance R2, resistance R3 and resistance R4, its characterized in that: the output end of the three-phase power input and DC output unit is connected with a rectifier, the output end of the weak current input unit is connected with a power reference chip, the rectifier is electrically connected with a reactor unit, the reactor unit is electrically connected with a DC _ link capacitor, a resistor R1, a resistor R2, a resistor R3 and a resistor R4 are electrically connected, the power reference chip is electrically connected with a resistor R1, a resistor R2, a resistor R3 and a resistor R4, the rectifier is electrically connected with a relay and a freewheeling diode, and the relay is electrically connected with the freewheeling diode.
2. The high-power direct-current bus detection device according to claim 1, wherein the detection device comprises the following working steps:
s1, enabling large current to flow through the reactor unit, and enabling the large current to be mutually induced to the secondary side to form V1;
s2, the initial V1 is lower than the non-inverting terminal V + of the comparator, Vout is Vcc;
s3, where V + (R3 Vcc + (R2+ R4) × Vref ]/(R2+ R3+ R4), V1 rises with increasing current;
s4, if V1> V +, that is, V1> [ R3+ Vcc + (R2+ R4) > Vref ]/(R2+ R3+ R4), Vout is 0V, at this time, V + (Vref) R4/(R3+ R4), and when the current exceeds a certain value, the relay LAY1 is turned off, and the current value is decreased;
s5, when V1< V +, i.e. V1< Vref × R4/(R3+ R4), Vout is Vcc, thus 1-6 is a complete cycle;
the S6 and the L1 can be used as a mutual inductor to accurately detect the flowing current, when the L1 is used as a reactor, the device can separate the noise on DC and three-phase input, the EMI is reduced, and meanwhile, a stable power supply is provided for the control of the back end.
3. The high-power direct-current bus detection device according to claim 1, wherein: the reactor unit may be replaced by a transformer unit.
4. The high-power direct-current bus detection device according to claim 1, wherein: the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are all conventional resistors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210021620.8A CN114325059A (en) | 2022-01-10 | 2022-01-10 | High-power direct current bus detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210021620.8A CN114325059A (en) | 2022-01-10 | 2022-01-10 | High-power direct current bus detection device |
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| CN109342935A (en) * | 2018-10-08 | 2019-02-15 | 珠海格力电器股份有限公司 | A kind of DC bus charging circuit relay failure detection device, method and motor |
| CN208753967U (en) * | 2018-09-20 | 2019-04-16 | 沈阳鼓风机集团股份有限公司 | A kind of UMDs DC bus protective device |
| CN111929494A (en) * | 2020-08-03 | 2020-11-13 | 珠海格力电器股份有限公司 | Direct current bus voltage detection circuit with protection function and air conditioning system |
| CN113156185A (en) * | 2021-03-30 | 2021-07-23 | 中国南方电网有限责任公司超高压输电公司梧州局 | DC bus voltage monitoring system |
-
2022
- 2022-01-10 CN CN202210021620.8A patent/CN114325059A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1445552A (en) * | 2003-04-17 | 2003-10-01 | 大连理工大学 | Power supply source for photoelectricity type current transformer |
| JP2007074884A (en) * | 2005-09-09 | 2007-03-22 | Yaskawa Electric Corp | Converter apparatus (low voltage detecting method) |
| CN200996977Y (en) * | 2006-12-30 | 2007-12-26 | 青岛海信空调有限公司 | Charge-consumption detecting circuit and air conditioner therewith |
| US20090079417A1 (en) * | 2007-09-21 | 2009-03-26 | Mort Deborah K | Inductively powered power bus apparatus |
| KR20090085008A (en) * | 2009-07-06 | 2009-08-06 | 추상우 | Voltage and current mutual induction reactor type power saving device |
| CN106526334A (en) * | 2016-11-25 | 2017-03-22 | 北京科诺伟业光电科技有限公司 | Capacity detection circuit for DC bus capacitor of photovoltaic inverter |
| CN208753967U (en) * | 2018-09-20 | 2019-04-16 | 沈阳鼓风机集团股份有限公司 | A kind of UMDs DC bus protective device |
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