CN206990681U - Load coil grounding resistance monitors in real time and protection circuit - Google Patents
Load coil grounding resistance monitors in real time and protection circuit Download PDFInfo
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- CN206990681U CN206990681U CN201720545741.7U CN201720545741U CN206990681U CN 206990681 U CN206990681 U CN 206990681U CN 201720545741 U CN201720545741 U CN 201720545741U CN 206990681 U CN206990681 U CN 206990681U
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- induction coil
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- real time
- grounding resistance
- bridge circuit
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Abstract
It the utility model is related to electromagnetic induction heating technology field; a kind of disclosed induction coil grounding resistance monitors in real time and protection circuit; including driving pulse generation circuit, H-bridge circuit; the control terminal of H-bridge circuit is respectively connecting to driving pulse generation circuit, and the output end of H-bridge circuit is connected by transformer, HF filtering capacitor C2 and High frequency filter inductance L1, L2 with being connected to the measurement end of induction coil and earth terminal；The earth terminal of H-bridge circuit is connected by current sense resistor R1 with power supply V2, power supply V3 earth terminal；Current sense resistor R1 test side is connected to voltage comparator U1A, voltage comparator output end connection protection circuit.The utility model is capable of the size variation of real time on-line monitoring induction coil grounding resistance; can be before induction coil be struck sparks; i.e. quick acting sends protection signal and cut off the electricity supply, and effectively solves the impaired problem of induction coil copper pipe, workpiece, and bring good economic benefits.
Description
Technical field
Electromagnetic induction heating technology field is the utility model is related to, more particularly to a kind of induction coil grounding resistance is supervised in real time
Survey and protection circuit.
Background technology
At present, induction heating technique is in the steel of industry manufacture field and non-ferrous metal metallurgy, rolling, forging, heat treatment
Etc. in link using more and more common, it is basic form by induction heating power, load coil, be heated workpiece or part,
Cooling system, control system etc..Load coil is usually according to actual heating-up temperature field, Distribution of Magnetic Field needs, by red copper
Pipe turns to variously-shaped and water flowing and cooled down；Because the heated workpiece of induction coil distance that electromagnetic field nature determines is nearer
Electromagnetic induction coupling effect is better；In order to obtain the preferable efficiency of heating surface and save the effect of the energy, induction coil copper pipe and work
It is very severe that the gap of part only has several millimeters of working conditions.Due in heating process workpiece band oxide skin, iron filings, thermal deformation,
Mechanical displacement etc., easily occurs induction coil and workpiece contact, collision produce spark phenomenon, the lighter's damage, serious causes to feel
Coil, workpiece is answered to scrap and extra economic loss.
Therefore, the industry is existing in sparking there is an urgent need to a kind of contact condition that can monitor induction coil and workpiece in real time
As before generation it is fast and reliable send protection signal to induction heating power control system fast shut-off power supply real-time monitoring with
Protection circuit.
The content of the invention
Caused damage to overcome load coil and workpiece to be in contact with collision generation spark phenomenon, this practicality is new
Type discloses a kind of induction coil grounding resistance monitoring and protection circuit in real time.
Technical scheme is used by the utility model solves above-mentioned technical problem：
A kind of induction coil grounding resistance in real time monitoring and protection circuit, including driving pulse generation circuit, H-bridge circuit,
Power supply V2, power supply V3, control terminal NET24, NET25, NET26, NET27 of H-bridge circuit are respectively connecting to driving pulse and produce electricity
Road, the output end of H-bridge circuit are connected by NET11, NET13 with transformer TX1, and the transformer TX1 other ends NET14, NET15 lead to
Cross HF filtering capacitor C2 and High frequency filter inductance L1, L2 and be connected to induction coil and earth terminal measurement end NET16,
NET17 connections；The power end of H-bridge circuit passes through current detecting by cable connection power supply V2 positive pole, the earth terminal of H-bridge circuit
Resistance R1 is connected with power supply V2, power supply V3 earth terminal；Current sense resistor R1 test side is connected to voltage comparator U1A,
Voltage comparator U1A comparison end is connected to the potentiometer R2 of partial pressure, voltage comparator output end NET28 connection protection circuits.
A kind of induction coil grounding resistance monitors in real time and protection circuit, and the H-bridge circuit is by triode Q1, Q2, Q3, Q4
Composition, the drive pulse signal of the control terminal of H-bridge circuit is complementary pulse signal；H-bridge circuit is used for the electricity for completing DC-AC
Rheology is changed.
Monitoring and protection circuit, described power supply V2, V3 are provided surely a kind of induction coil grounding resistance for whole circuit in real time
Fixed DC voltage：+15V、0V、-15V.
Monitoring and protection circuit, the protection circuit pass through three to a kind of induction coil grounding resistance by base resistance R4 in real time
The relay U2 of pole pipe Q5 output connections is formed, and relay U2 output end is provided with the switch protection of output relay protection signal
Terminal NET18, NET19, NET20.
A kind of induction coil grounding resistance monitors in real time and protection circuit, current sense resistor R1 both end voltages and inductance
L1, L2 output current are directly proportional, and the grounding resistance between output current and measurement end NET16, NET17 both ends is inversely proportional；
A kind of induction coil grounding resistance in real time monitoring and protection circuit, described transformer TX1 be used for impedance conversion, every
From signal, the measurement for inductor isolation.
Monitoring and protection circuit, the potentiometer R2 are used to adjust NET23 points a kind of induction coil grounding resistance in real time
Comparing voltage value, for the voltage ratio with voltage comparator NET23 points compared with the monitoring for induction coil grounding resistance size
Real-time guard.
The beneficial effects of the utility model are the size variation of real time on-line monitoring induction coil grounding resistance, to exceed
Protection value set in advance, before induction coil is struck sparks, i.e. quick acting sends protection signal and cut off the electricity supply, effective solution
Determine the impaired problem of induction coil copper pipe, workpiece, and brought good economic benefits.
Brief description of the drawings
Fig. 1 is the monitoring in real time of induction coil grounding resistance and protection circuit schematic diagram.
Embodiment
In Fig. 1, a kind of induction coil grounding resistance monitoring and protection circuit, including driving pulse generation circuit, H in real time
Bridge circuit, power supply V2, power supply V3, control terminal NET24, NET25, NET26, NET27 of H-bridge circuit are respectively connecting to driving pulse
Generation circuit, the output end of H-bridge circuit are connected by NET11, NET13 with transformer TX1, transformer TX1 other ends NET14,
NET15 passes through HF filtering capacitor C2 and High frequency filter inductance L1, L2 and the measurement end for being connected to induction coil and earth terminal
NET16, NET17 are connected；The power end of H-bridge circuit passes through electricity by cable connection power supply V2 positive pole, the earth terminal of H-bridge circuit
Stream detection resistance R1 is connected with power supply V2, power supply V3 earth terminal；Current sense resistor R1 test side be connected to voltage ratio compared with
Device U1A, voltage comparator U1A comparison end are connected to the potentiometer R2 of partial pressure, voltage comparator output end NET28 connections protection
Circuit.
The H-bridge circuit is made up of triode Q1, Q2, Q3, Q4, and the drive pulse signal of the control terminal of H-bridge circuit is mutual
COMPLEMENT pulse signals；H-bridge circuit is used for the current transformation for completing DC-AC.Described power supply V2, V3 are whole circuit with stable
DC voltage：+15V、0V、-15V.
The relay U2 that the protection circuit is exported connection by base resistance R4 by triode Q5 is formed, relay U2's
Output end is provided with switch protection terminal NET18, NET19, NET20 of output relay protection signal.Current sense resistor R1 two
Terminal voltage is directly proportional to inductance L1, L2 output current, the ground connection electricity between output current and measurement end NET16, NET17 both ends
Resistance is inversely proportional；Described transformer TX1 is used for impedance conversion, isolation signals, the measurement for inductor isolation.The current potential
Device R2 is used to adjust the comparing voltage values of NET23 points, for the NET23 of voltage comparator point voltage ratios compared with for the line of induction
Enclose the monitoring real-time guard of grounding resistance size.
This circuit includes power supply V2, V3, triode Q1, Q2, Q3, Q4, current sense resistor R1, power supply decoupling capacitance C1,
C3, transformer TX1, filter condenser C2, filter inductance L1, L2, driving pulse generation circuit, resistance R3, potentiometer R2, filtering
Capacitor C4, C5, voltage comparator U1A, base resistance R4, drive triode Q5, relay U2.Voltage comparator U1A models
For TL082.Wherein driving pulse generation circuit uses prior art, the finished product of market purchasing.
It is that NET24, NET25, NET26, NET27 are connected to driving pulse production that Q1, Q2, Q3, Q4, which form H-bridge circuit control terminal,
Raw, crystal drive circuit moving pulse generation circuit output complementary pulse control H bridges, output end NET11, NET13 produces alternating voltage driving
Transformer TX1；Transformer output end NET14, NET15 connects HF filtering capacitor C2 and High frequency filter inductance L1, L2,
NET16, NET17 are that measurement end is connected to induction coil and earth terminal, monitor the resistance value of induction coil and earth terminal in real time.
Induction coil grounding resistance monitors in real time and protection circuit, and the H-bridge circuit completion direct current that Q1, Q2, Q3, Q4 are formed-
The function of alternating current conversion.Transformer TX1 completes impedance conversion, isolation signals, realizes the function with inductor isolation measurement.
Potentiometer R2 can adjust the comparing voltage value of NET23 points, realize the monitoring real-time guard of induction coil grounding resistance size.
Node NET16, NET17 connect induction coil and earth terminal, power frequency 1-100Khz models when induction coil works
Enclose, filter inductance L1, L2 select larger inductance value, and filter condenser C2 equally selects bigger value, can effectively filtered
Ripple, 1-100Khz signal is prevented to enter transformer TX1.Voltage about 50-1000V scopes between node NET16, NET17, electricity
Sense L1, L2 prevents turn-to-turn insulation from failing from pressure-resistant higher device.
Claims (7)
1. a kind of induction coil grounding resistance monitors in real time and protection circuit, it is characterized in that：Including driving pulse generation circuit, H
Bridge circuit, power supply V2, power supply V3, control terminal NET24, NET25, NET26, NET27 of H-bridge circuit are respectively connecting to driving pulse
Generation circuit, the output end of H-bridge circuit are connected by NET11, NET13 with transformer TX1, transformer TX1 other ends NET14,
NET15 passes through HF filtering capacitor C2 and High frequency filter inductance L1, L2 and the measurement end for being connected to induction coil and earth terminal
NET16, NET17 are connected；The power end of H-bridge circuit passes through electricity by cable connection power supply V2 positive pole, the earth terminal of H-bridge circuit
Stream detection resistance R1 is connected with power supply V2, power supply V3 earth terminal；Current sense resistor R1 test side be connected to voltage ratio compared with
Device U1A, voltage comparator U1A comparison end are connected to the potentiometer R2 of partial pressure, voltage comparator output end NET28 connections protection
Circuit.
2. a kind of induction coil grounding resistance according to claim 1 monitors in real time and protection circuit, it is characterized in that：It is described
H-bridge circuit is made up of triode Q1, Q2, Q3, Q4, and the drive pulse signal of the control terminal of H-bridge circuit is complementary pulse signal；H
Bridge circuit is used for the current transformation for completing DC-AC.
3. a kind of induction coil grounding resistance according to claim 1 monitors in real time and protection circuit, it is characterized in that：It is described
Power supply V2, V3 are the DC voltage of whole circuit with stable：+15V、0V、-15V.
4. a kind of induction coil grounding resistance according to claim 1 monitors in real time and protection circuit, it is characterized in that：It is described
The relay U2 that protection circuit is exported connection by base resistance R4 by triode Q5 is formed, and relay U2 output end is provided with
Export switch protection terminal NET18, NET19, NET20 of relay protection signal.
5. a kind of induction coil grounding resistance according to claim 1 monitors in real time and protection circuit, it is characterized in that：Electric current
Detection resistance R1 both end voltages are directly proportional to inductance L1, L2 output current, output current and measurement end NET16, NET17 both ends
Between grounding resistance be inversely proportional.
6. a kind of induction coil grounding resistance according to claim 1 monitors in real time and protection circuit, it is characterized in that：It is described
Transformer TX1 be used for impedance conversion, isolation signals, for inductor isolation measurement.
7. a kind of induction coil grounding resistance according to claim 1 monitors in real time and protection circuit, it is characterized in that：It is described
Potentiometer R2 is used for the comparing voltage value for adjusting NET23 points, realizes with the voltage ratio of voltage comparator NET23 points compared with realization sense
Answer the monitoring real-time guard of coil grounding resistance size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720545741.7U CN206990681U (en) | 2017-05-17 | 2017-05-17 | Load coil grounding resistance monitors in real time and protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720545741.7U CN206990681U (en) | 2017-05-17 | 2017-05-17 | Load coil grounding resistance monitors in real time and protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206990681U true CN206990681U (en) | 2018-02-09 |
Family
ID=61389591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720545741.7U Active CN206990681U (en) | 2017-05-17 | 2017-05-17 | Load coil grounding resistance monitors in real time and protection circuit |
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| CN (1) | CN206990681U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106980048A (en) * | 2017-05-17 | 2017-07-25 | 洛阳科诺工业设备有限公司 | Load coil grounding resistance is monitored and protection circuit in real time |
| CN109496001A (en) * | 2018-09-27 | 2019-03-19 | 江苏利普机械有限公司 | 1600T forging automatic heating circuit device |
-
2017
- 2017-05-17 CN CN201720545741.7U patent/CN206990681U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106980048A (en) * | 2017-05-17 | 2017-07-25 | 洛阳科诺工业设备有限公司 | Load coil grounding resistance is monitored and protection circuit in real time |
| CN106980048B (en) * | 2017-05-17 | 2024-02-23 | 洛阳科诺工业设备有限公司 | Real-time monitoring and protecting circuit for ground resistance of induction heating coil |
| CN109496001A (en) * | 2018-09-27 | 2019-03-19 | 江苏利普机械有限公司 | 1600T forging automatic heating circuit device |
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