CN203788160U - Double-frequency power source for quenching heating equipment - Google Patents
Double-frequency power source for quenching heating equipment Download PDFInfo
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- CN203788160U CN203788160U CN201420158646.8U CN201420158646U CN203788160U CN 203788160 U CN203788160 U CN 203788160U CN 201420158646 U CN201420158646 U CN 201420158646U CN 203788160 U CN203788160 U CN 203788160U
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- 238000010438 heat treatment Methods 0.000 title abstract description 5
- 238000010791 quenching Methods 0.000 title abstract description 5
- 230000000171 quenching effect Effects 0.000 title abstract description 4
- 230000009977 dual effect Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 9
- 238000010304 firing Methods 0.000 claims description 9
- 230000001360 synchronised effect Effects 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 4
- 238000009499 grossing Methods 0.000 claims description 4
- 230000032258 transport Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 abstract 3
- 238000000034 method Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000036581 peripheral resistance Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model provides a double-frequency power source for quenching heating equipment. The double-frequency power source comprises a main power source loop and a power source control circuit. A structure of the power source control circuit is characterized in that: a logic control circuit controls a direct current power source, a synchronization signal circuit, a rectification pulse circuit, an inversion pulse circuit, an inversion driving circuit and a first phase-locked loop circuit; a demodulation sampling circuit is connected with a load connection terminal of an inversion bridge, a voltage signal transmitted by the demodulation sampling circuit is transmitted to a first sweep frequency circuit, the first sweep frequency circuit is connected with the first phase-locked loop circuit to form a first sweep frequency unit, a second sweep frequency circuit is connected with a second phase-locked loop circuit to form a second sweep frequency unit, the second phase-locked loop circuit is further controlled by the logic control circuit, the voltage signal transmitted by the demodulation sampling circuit is further transmitted to the second sweep frequency circuit, and whether the two sweep frequency units are in independent connection with the inversion pulse circuit is selected through a double-frequency switching circuit. The double-frequency power source realizes time-sharing double-frequency and further guarantees an oscillation-start success rate to be 100%.
Description
Technical field
The utility model relates to a kind of dual frequency power supplies for the firing equipment that quenches, and belongs to induction heating field.
Background technology
At present, known induction heating power all only has a kind of frequency (intermediate frequency 2～10KHz, superaudio 20～50KHz or high frequency 200～300KHz).
In the time that large gear or gear ring are carried out to overall impewdance matching, if select the Mid Frequency of single-frequency power supply to tend to cause that tooth root portion quench-hardened case is blocked up and tooth top portion quench-hardened case is excessively thin, make the gear teeth portion low fragility of intensity large, easy tooth-breaking in running; Do not get angry if select the Supersonic frequency range of single-frequency power supply can cause the blocked up tooth root of quench-hardened case portion of tooth top portion to quench, make to wear and tear in gear running very fast.Afterwards, in industry, there is the scheme that adopts respectively intermediate frequency and superaudio timesharing to heat same workpiece two power supplys, although can overcome the defect that single-frequency is quenched, need on the same station of same quenching machine, configure two power supplys, this has just increased equipment cost greatly.
Summary of the invention
Can be operated in two frequency bands in order to realize a power supply, the utility model proposes a kind of dual frequency power supplies for the firing equipment that quenches, particularly improve in inversion impulse circuit part, energy timesharing ground is successful two frequency band frequency sweeps, and ensures starting of oscillation success rate 100%.
For this reason, the technical solution of the utility model is: for the dual frequency power supplies of the firing equipment that quenches, be made up of power supply major loop, power control circuit;
The structure of power supply major loop: connected and composed successively by electric power incoming line, rectification circuit, smoothing reactor, inverter bridge, inverter bridge is drawn load splicing ear;
It is characterized in that the structure of power control circuit: comprise DC power supply, logic control circuit, synchronous signal circuit, commutating pulse circuit, inversion impulse circuit, inverse changing driving circuit, the first frequency sweep circuit, the first phase-locked loop circuit, detection sample circuit;
DC power supply is converted to low-voltage DC three-phase electricity, power supply is provided to other control circuits;
Logic control circuit control DC power supply, synchronous signal circuit, commutating pulse circuit, inversion impulse circuit, inverse changing driving circuit, the first phase-locked loop circuit;
Synchronous signal circuit provides low voltage three-phase voltage signal, so that commutating pulse circuit is according to the starting point of three-phase voltage crosspoint as rectification phase shifting angle being detected;
Commutating pulse circuit control rectification circuit, is responsible for sending trigger impulse to rectification circuit;
Inversion impulse circuit is connected with inverse changing driving circuit, for controlling inverter bridge;
Detection sample circuit accesses at the load splicing ear place of inverter bridge, and the voltage signal transporting passes to the first frequency sweep circuit, and the first frequency sweep circuit and the first phase-locked loop circuit connect and compose the first frequency sweep unit;
Power control circuit is also provided with the second frequency sweep unit, double frequency commutation circuit, the second frequency sweep unit is connected and composed by the second frequency sweep circuit and the second phase-locked loop circuit, the voltage signal that detection sample circuit transports also passes to the second frequency sweep circuit, double frequency commutation circuit output is connected with inversion impulse circuit, whether two inputs of double frequency commutation circuit are connected with the first frequency sweep unit, the second frequency sweep unit respectively, select the first frequency sweep unit, the second frequency sweep unit to be connected separately with inversion impulse circuit; The second phase-locked loop circuit is also by logic control circuit control.
Further restriction to technique scheme: be also provided with thermal-shutdown circuit, overvoltage crowbar, open-phase protection circuit in power control circuit, thermal-shutdown circuit, overvoltage crowbar and open-phase protection circuit are also by logic control circuit control.
Beneficial effect: the utility model, by power control circuit is improved, is realized time-division dual frequency by two frequency sweep frequency sweep unit, energy timesharing ground is successful two frequency band frequency sweeps, and ensures starting of oscillation success rate 100%.Reduce equipment cost with this, make manufacturability be protected simultaneously.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is utilization schematic diagram of the present utility model.
Fig. 3 is the structure principle chart of frequency sweep circuit.
Number in the figure is: 1, electric power incoming line; 2, rectification circuit; 3, smoothing reactor; 4, inverter bridge; 5, load; 6, for the dual frequency power supplies of the firing equipment that quenches; 7, switch; 8, the first load; 9, inductor; 10, the second load.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
As shown in Figure 1, for the dual frequency power supplies of the firing equipment that quenches, formed by power supply major loop, power control circuit;
The structure of power supply major loop: connected and composed successively by electric power incoming line 1, rectification circuit 2, smoothing reactor 3, inverter bridge 4, inverter bridge 4 is drawn load splicing ear, load splicing ear is connected with load 5;
The structure of power control circuit: comprise DC power supply, logic control circuit, synchronous signal circuit, commutating pulse circuit, inversion impulse circuit, inverse changing driving circuit, the first frequency sweep circuit, the first phase-locked loop circuit, detection sample circuit;
DC power supply is converted to low-voltage DC three-phase electricity, power supply is provided to other control circuits;
Logic control circuit control DC power supply, synchronous signal circuit, commutating pulse circuit, inversion impulse circuit, inverse changing driving circuit, the first phase-locked loop circuit; The function that logic control circuit has be control electric power starting, stop, fault, far/near control, power on/off, instruction;
Synchronous signal circuit provides low voltage three-phase voltage signal, so that commutating pulse circuit is according to the starting point of three-phase voltage crosspoint as rectification phase shifting angle being detected;
Commutating pulse circuit control rectification circuit, is responsible for sending trigger impulse to rectification circuit;
Inversion impulse circuit is connected with inverse changing driving circuit, for controlling inverter bridge;
Detection sample circuit accesses at the load splicing ear place of inverter bridge, and the voltage signal transporting passes to the first frequency sweep circuit, and the first frequency sweep circuit and the first phase-locked loop circuit connect and compose the first frequency sweep unit;
Dotted line frame part as shown in Figure 1, for double frequency electricity power control circuit is also provided with the second frequency sweep unit, double frequency commutation circuit, the second frequency sweep unit is connected and composed by the second frequency sweep circuit and the second phase-locked loop circuit, the voltage signal that detection sample circuit transports also passes to the second frequency sweep circuit, double frequency commutation circuit output is connected with inversion impulse circuit, whether two inputs of double frequency commutation circuit are connected with the first frequency sweep unit, the second frequency sweep unit respectively, select the first frequency sweep unit, the second frequency sweep unit to be connected separately with inversion impulse circuit; The second phase-locked loop circuit is also by logic control circuit control.
As shown in Figure 1, be also provided with thermal-shutdown circuit, overvoltage crowbar, open-phase protection circuit in power control circuit, thermal-shutdown circuit, overvoltage crowbar and open-phase protection circuit are also by logic control circuit control.Thermal-shutdown circuit, overvoltage crowbar and open-phase protection circuit are circuit conventional design.
As shown in Figure 1, logic control circuit adopts programmable logic controller (PLC) (PLC) conventionally, further can adopt single-chip microcomputer Programmable Logic Controller.
Operation principle of the present utility model: the swept frequency range of frequency sweep circuit determines by peripheral resistance and electric capacity, or be (the first) intermediate frequency frequency sweep, or be the scanning of (the second) superaudio; In order to realize dual frequency power supplies, between the inverter circuit of this power supply and two frequency sweep circuits, be provided with frequency sweep commutation circuit, this double frequency commutation circuit is mainly made up of small solid relay, when intermediate frequency operating state, it is responsible for the incision of an intermediate frequency (first) phase-locked loop circuit and intermediate frequency (first) frequency sweep circuit, makes to produce in circuit electric current of intermediate frequency; When superaudio operating state, it is responsible for a superaudio (second) phase-locked loop circuit and the incision of superaudio (second) frequency sweep circuit, makes to produce superaudio electric current in circuit, realizes same power supply time-division dual frequency.
As shown in Figure 2, when the utility model uses on quenching heating lathe, the two ends of the first load 8 and the second load 10 are connected with respectively a switch 7, be connected to the first load 8 and the second load 10 switch 7 above for the inverter bridge of dual frequency power supplies 6 of the firing equipment that quenches, two switchs 7 are worked in coordination two kinds of carried selectives with different parameters are accessed to major loop, the first load 8 and the second load 10 being connected with inductor 9 more below, thus be the alternating current of two kinds of different frequencies of inductor timesharing conveying.
Described the first load 8 is intermediate frequency load, is in series by capacitor A1 and transformer A2, and resonant tank frequency is at 2 KHz～10KHz; Described the second load is superaudio load, is in series by capacitor B1 and transformer B2, and resonant tank frequency is at 20 KHz～50KHz.
As shown in Figure 1, the utility model adopts the method for zero-pressure frequency sweep starting, makes introduction below with regard to the method.
1, the zero-pressure frequency sweep principle that starts to work
Zero-pressure frequency scanning soft start is at load circuit without any additional start-up energy in the situation that, progressively reasonably raise and the energy of rectification circuit input load increases gradually by the direct voltage of commutating circuit, make load circuit produce resonance, inverter bridge is able to the normal change of current, thereby completes starting; So-called zero-pressure, refers to that rectification circuit VD is started from scratch to be elevated to gradually a certain lower value, just allows after start successfully direct voltage to press outside adjusting given and increase; Ensure so on the one hand, in the time that starting failure, Converting Unit lead directly to, can not cause large impulse current, can not damage components and parts; Voltage is to raise gradually from zero on the other hand, has reduced power supply and has started the impact to electrical network, therefore be called soft start; So-called frequency sweep, refers to that the separate excitation signal frequency that triggers inverter circuit in starting process changes from high to low according to the scope of setting, and in the time that separate excitation signal frequency approaches the resonance frequency of load, load starting of oscillation, starts successfully; The method has solved the problem that separate excitation signal frequency and load resonant frequency match, and makes the load for different resonance frequencys, and the starting success rate of power supply all approaches 100%.
2, zero-pressure frequency scanning soft start circuit is divided into: phase-locked loop circuit, frequency sweep circuit;
2.1 phase-locked loop circuits are phase place automatic regulating systems, are generally made up of phase comparator, voltage controlled oscillator and 3 elementary cells of low pass filter.The utility model can adopt CD4046 phase-locked loop circuit;
2.2 frequency sweep circuit
Frequency sweep circuit (in the utility model, the first frequency sweep circuit is identical with the structure of the second frequency sweep circuit), as shown in Figure 3, when power supply starting, initiating signal voltage raises, comparator output high level, diode cut-off, capacitor charging; The voltage of this increase is delivered to adjuster, after subtracting each other, then through proportional integral (PI) computing output one voltage reducing, delivers to phase-locked loop circuit with the mean value at inversion angle, controls inversion pulse frequency and changes from high to low, be i.e. " frequency sweep "; The value of control capacittance and charging resistor thereof, can set charging interval of electric capacity, sets the time of a frequency sweep.
Claims (2)
1. for the dual frequency power supplies of the firing equipment that quenches, by power supply major loop, power control circuit
Composition;
The structure of power supply major loop: connected and composed successively by electric power incoming line, rectification circuit, smoothing reactor, inverter bridge, inverter bridge is drawn load splicing ear;
it is characterized in thatthe structure of power control circuit: comprise DC power supply, logic control circuit, synchronous signal circuit, commutating pulse circuit, inversion impulse circuit, inverse changing driving circuit, the first frequency sweep circuit, the first phase-locked loop circuit, detection sample circuit;
DC power supply is converted to low-voltage DC three-phase electricity, power supply is provided to other control circuits;
Logic control circuit control DC power supply, synchronous signal circuit, commutating pulse circuit, inversion impulse circuit, inverse changing driving circuit, the first phase-locked loop circuit;
Synchronous signal circuit provides low voltage three-phase voltage signal, so that commutating pulse circuit is according to the starting point of three-phase voltage crosspoint as rectification phase shifting angle being detected;
Commutating pulse circuit control rectification circuit, is responsible for sending trigger impulse to rectification circuit;
Inversion impulse circuit is connected with inverse changing driving circuit, for controlling inverter bridge;
Detection sample circuit accesses at the load splicing ear place of inverter bridge, and the voltage signal transporting passes to the first frequency sweep circuit, and the first frequency sweep circuit and the first phase-locked loop circuit connect and compose the first frequency sweep unit;
Power control circuit is also provided with the second frequency sweep unit, double frequency commutation circuit, the second frequency sweep unit is connected and composed by the second frequency sweep circuit and the second phase-locked loop circuit, the voltage signal that detection sample circuit transports also passes to the second frequency sweep circuit, double frequency commutation circuit output is connected with inversion impulse circuit, whether two inputs of double frequency commutation circuit are connected with the first frequency sweep unit, the second frequency sweep unit respectively, select the first frequency sweep unit, the second frequency sweep unit to be connected separately with inversion impulse circuit; The second phase-locked loop circuit is also by logic control circuit control.
2. the dual frequency power supplies for the firing equipment that quenches according to claim 1; it is characterized in that: in power control circuit, be also provided with thermal-shutdown circuit, overvoltage crowbar, open-phase protection circuit, thermal-shutdown circuit, overvoltage crowbar and open-phase protection circuit are also by logic control circuit control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420158646.8U CN203788160U (en) | 2014-04-03 | 2014-04-03 | Double-frequency power source for quenching heating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420158646.8U CN203788160U (en) | 2014-04-03 | 2014-04-03 | Double-frequency power source for quenching heating equipment |
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| Publication Number | Publication Date |
|---|---|
| CN203788160U true CN203788160U (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420158646.8U Expired - Lifetime CN203788160U (en) | 2014-04-03 | 2014-04-03 | Double-frequency power source for quenching heating equipment |
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| CN (1) | CN203788160U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944408A (en) * | 2014-04-03 | 2014-07-23 | 十堰恒进科技有限公司 | Dual-frequency power source quenching heating equipment |
-
2014
- 2014-04-03 CN CN201420158646.8U patent/CN203788160U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944408A (en) * | 2014-04-03 | 2014-07-23 | 十堰恒进科技有限公司 | Dual-frequency power source quenching heating equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 442012 Shiyan city of Hubei province PRINTRONICS Pulin Industrial Park Road No. 6 Patentee after: SHIYAN HENGJIN INDUCTION TECHNOLOGY CO.,LTD. Address before: 442012 Shiyan city of Hubei province PRINTRONICS Pulin Industrial Park Road No. 6 Patentee before: SHIYAN HEATKING TECHNOLOGY CO.,LTD. |
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| CX01 | Expiry of patent term |
Granted publication date: 20140820 |
|
| CX01 | Expiry of patent term |