CN208656645U - Heating device - Google Patents
Heating device Download PDFInfo
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- CN208656645U CN208656645U CN201821304448.2U CN201821304448U CN208656645U CN 208656645 U CN208656645 U CN 208656645U CN 201821304448 U CN201821304448 U CN 201821304448U CN 208656645 U CN208656645 U CN 208656645U
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Abstract
The utility model relates to heating power supply technical fields, disclose a kind of heating device, the heating device is mainly by isolating transformer (TX1), resistance wire (L1) is constituted, isolating transformer (TX1) has armature winding and secondary windings, secondary windings is earth-free and opposing primary winding electrical isolation, secondary windings has the first secondary tap (201) for being located at least in winding both ends, second subprime tap (202) and the third secondary tap (203) between the first secondary tap (201) and second subprime tap (202), first secondary tap (201) and second subprime tap (202) are connected to one end of resistance wire simultaneously, third secondary tap (203) is connected to the other end of resistance wire (L1), thus it is formed in the primary side of isolating transformer (TX1) To the heating current supply circuit of resistance wire (L1) power supply.The heating device can be improved the safety using Resistant heating and promote the service efficiency of transformer in circuit.
Description
Technical field
The utility model relates to heating power supply technical fields, more specifically to a kind of heating device.
Background technique
Resistance wire is powered so that resistance wire fever is common heat mode.A kind of heater circuit is by resistance wire
Both ends be directly accessed power frequency, the i.e. alternating voltage of 220V/50Hz, by alternating voltage to resistance wire power supply to heat.However,
In this heater circuit, if occurring leaking electricity or short circuit, great security risk will be caused to user.
For this purpose, occurring that reduce the voltage to safe voltage right again using transformer (Industrial Frequency Transformer) again in the prior art
The mode that resistance wire is powered can be effectively reduced security risk in this way.However, due to existing Industrial Frequency Transformer volume
It is bigger, weight is big, there is biggish iron loss and copper loss in transformer, and transformer is born in long-play at work
Load-loss is also influenced by transformer temperature, and leakage magnetic flux caused by load current can generate eddy-current loss, efficiency in winding
It is lower.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of higher heating devices of highly-safe and efficiency.
The technical scheme adopted by the utility model to solve the technical problem is as follows: constructing a kind of heating device mainly by being isolated
Transformer TX1, resistance wire L1 are constituted, and the isolating transformer TX1 has armature winding and secondary windings, and the secondary windings is not
It is grounded and the relatively described armature winding electrical isolation, the secondary windings has the first secondary tap for being located at least in winding both ends
201, second subprime tap 202 and the third secondary between first secondary tap 201 and second subprime tap 202
Tap 203, first secondary tap 201 and the second subprime tap 202 are connected to one end of the resistance wire, institute simultaneously
The other end that third secondary tap 203 is connected to the resistance wire L1 is stated, thus in the primary side shape of the isolating transformer TX1
The heating current supply circuit of the resistance wire L1 power supply in pairs.
Preferably, the heating current supply circuit further includes first diode D1 and the second diode D2, the one or two pole
The anode of pipe D1 is connect with first secondary tap 201, anode and the second subprime tap of the second diode D2
202 connections, the cathode of the cathode of the first diode D1 and the second diode D2 simultaneously with the resistance wire L1 one
End connection.
Preferably, the heating current supply circuit further includes first capacitor device C1, and the first capacitor device C1 is connected to described
Between third secondary tap 203 and the other end of the resistance wire L1.
Preferably, the armature winding has the first primary tap 101 and the second primary tap 102, becomes in the isolation
The primary side of depressor TX1 further includes the first field-effect tube Q1, the second field-effect tube Q2, third field-effect tube Q3 and the 4th effect
Should pipe Q4, the first field-effect tube Q1 connect with the third field-effect tube Q3, the second field-effect tube Q2 and described the
It is connected in parallel on the concatenated first field-effect tube Q1, the both ends third field-effect tube Q3 again after four field-effect tube Q4 series connection；
The drain electrode of the first field-effect tube Q1, the second field-effect tube Q2 drain electrode and meanwhile connect the one of external power supply
End, the source electrode of the first field-effect tube Q1, the second field-effect tube Q2 source electrode connect the other end of external power supply simultaneously；
The drain electrode of the source electrode of the first field-effect tube Q1 and the third field-effect tube Q3 are connected and connect to described the
One primary tap 101, the drain electrode of the source electrode and the 4th field-effect tube Q4 of the second field-effect tube Q2 are connected and connect to
Described second primary tap 102.
Preferably, the first field-effect tube Q1 is connected to pulse width identical first with the third field-effect tube Q3
Source driving signal S1, the second field-effect tube Q2 and the 4th field-effect tube Q4 are connected to pulse width identical second and drive
Dynamic signal source S2.
It preferably, further include first resistor device R1 and third capacitor C3, second resistor R2 and the second capacitor C2, institute
The grid for stating the first source driving signal S1 and the first field-effect tube Q1 is directly connected to, and one end of the first resistor device R1 connects
It connects on the first source driving signal S1, the grid of the other end of the first resistor device R1 and the third field-effect tube Q3
Connection, one end of the grid connection third capacitor C3 of the third field-effect tube Q3, the other end of the third capacitor C3
Ground connection,
The grid of the second source driving signal S2 and the second field-effect tube Q2 are directly connected to, the second resistor
One end of R2 is connected on the second source driving signal S2, the other end of the second resistor R2 and described 4th effect
Should pipe Q4 grid connection, the grid of the 4th field-effect tube Q4 connects one end of the second capacitor C2, second capacitor
The other end of device C2 is grounded.
It preferably, further include rectification unit in the primary side of the isolating transformer TX1, the rectification unit is that bridge-type is whole
Device is flowed, the positive while drain electrode and the second field-effect tube Q2 with the first field-effect tube Q1 of the bridge rectifier
Drain electrode is connected, the source electrode with the third field-effect tube Q3 and the 4th field-effect simultaneously of the cathode of the bridge rectifier
The source electrode of pipe Q4 is connected.
In the heating device of the utility model, since the secondary windings of isolating transformer is earth-free and opposing primary winding
Therefore electrical isolation is connected to being powered to resistance wire so that the heating current supply circuit of resistance wire fever is by phase for secondary windings side
It comes for secondary windings side high_voltage isolation, therefore, even if heating current supply circuit generates electric leakage, user will not be caused to endanger
Danger.In addition, since iron loss or copper loss are smaller at work for isolating transformer, temperature rise it is less, therefore, power consumption compared with
Few, efficiency is higher.
Detailed description of the invention
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing:
Fig. 1 is heating device internal circuit connection schematic diagram；
Fig. 2 is field-effect tube triggering waveform diagram；
Fig. 3 a, 3b are the gate driving circuit schematic diagrames of field-effect tube.
Specific embodiment
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing is detailed
Illustrate specific embodiment of the present utility model.
Fig. 1 is heating device internal circuit connection schematic diagram.As shown in Figure 1, in a kind of preferred reality of the utility model
It applies in mode, heating device mainly includes isolating transformer TX1 and resistance wire L1, wherein the input winding of isolating transformer TX1
(armature winding) is being electrically isolated from each other with output winding (secondary windings), and primary power source is mainly isolated in isolating transformer TX1
Circuit and secondary circuit floating over the ground, to avoid resistance wire it is possible that electric leakage or ground connection institute in prolonged heating process
Bring is dangerous, to guarantee Electrical Safety.
As described above, isolating transformer TX1 has armature winding and secondary windings, wherein at least three groups of secondary windings
Tap is located at first secondary tap 201 and second subprime tap 202 at secondary windings both ends, and be located at first grade and take out
Third secondary tap 203 between first 201 and second subprime tap 202.Between three groups of taps of secondary windings, every two groups of pumpings
Head is corresponding all to form a potential difference, and third secondary tap 203 is neutral point.Electric current can pass through 201 He of the first secondary tap
The one end for the resistance wire L1 that second subprime tap 202 is connected to simultaneously, the other end that electric current flows through resistance wire L1 flow back to third time
Thus grade tap 203 forms the heating current supply circuit to resistance wire L1 power supply in the primary side of isolating transformer TX1.
In the present embodiment, due to the secondary windings of isolating transformer TX1 is earth-free and opposing primary winding electrically every
From, therefore, be connected to secondary windings side to resistance wire L1 power so that resistance wire L1 fever heating current supply circuit it is opposite
In secondary windings side, high_voltage isolation comes, and therefore, even if heating current supply circuit generates electric leakage, will not cause danger to user.
In addition, since iron loss or copper loss are smaller at work by isolating transformer TX1, temperature rise it is less, therefore, power consumption compared with
Few, efficiency is higher.
In the present embodiment, it works in more stable voltage range, can add to guarantee to heat current supply circuit
First diode D1 and the second diode D2 is set in hot current supply circuit, wherein anode and first grade of first diode D1
Tap 201 connects, and the anode of the second diode D2 is connect with second subprime tap 202, the cathode of first diode D1 and second
The cathode of diode D2 is connect with one end of resistance wire L1 simultaneously.
The primary winding coil of isolating transformer TX1 and the turn ratio of secondary winding coil are 1:1, so not having reduction
The function of voltage, thus suitable diode can be selected according to the rated power size of resistance wire L1 in practical applications
(first diode D1 and the second diode D2).Diode typically serves to the effect of rectification in circuit, what halfwave rectifier obtained
Waveform is positive half cycle, so voltage can reduce by 50% or so, according to the quantity of transformer secondary output tap, the number of diode is not
Less than 2, specifically, electric current flows through the first secondary tap 201 and connect with the anode of first diode D1, one end of resistance wire L1
It is connect with the cathode of first diode D1, the voltage being added on resistance wire L1 will reduce.Similarly, second subprime tap 202 with
The anode connection of second diode D2, one end of resistance wire L1 are connect with the cathode of the second diode D2, and resistance wire L1 is obtained
Voltage can also reduce.As described above, the cathode of the cathode of first diode D1 and the second diode D2 should connect simultaneously in resistance wire
One end of L1, the voltage value of the first secondary tap 201 and second subprime tap 202 after diode is depressured are added to resistance
The both ends silk L1, enable resistance wire L1 to work in a more stable voltage range.
Further, a non-polar condenser, i.e. first capacitor device C1 can also be added by heating in current supply circuit, and first
Capacitor C1 is connected between third secondary tap 203 and the other end of resistance wire.It, can be according to resistance for first capacitor device C1
The rated power of silk L1 carrys out the capacitor C1 of selection parameter adaptation, and capacitor C1 can cut down or inhibit during charge and discharge
The peak voltage of power supply signal extends the service life of resistance wire L1.As shown in Figure 1, the armature winding of isolating transformer TX1
It is upper that there is the first primary tap 101 and the second primary tap 102, it further include 4 field-effect tube in the primary side of isolating transformer
(NMOS tube), the field-effect tube are the enhanced pipe of n-channel, and the enhanced metal-oxide-semiconductor of n-channel must apply positively biased electricity on grid
Pressure, and the only grid voltage n channel MOS tube that is greater than threshold voltage Shi Caiyou conducting channel, 4 field-effect tube are respectively the
One field-effect tube Q1, the second field-effect tube Q2, third field-effect tube Q3 and the 4th field-effect tube Q4.First field-effect tube Q1 with
Third field-effect tube Q3 series connection, the second field-effect tube Q2 are connected in parallel on concatenated first after connecting with the 4th field-effect tube Q4 again
Effect pipe Q1, the both ends third field-effect tube Q3.The drain electrode of first field-effect tube Q1, the drain electrode of the second field-effect tube Q2 connect simultaneously
Connect one end of external power supply, the source electrode of the first field-effect tube Q1, the second field-effect tube Q2 source electrode connect external power supply simultaneously
The other end.The source electrode of first field-effect tube Q1 and the drain electrode of third field-effect tube Q3 are connected and connect to the first primary tap 101,
The drain electrode of the source electrode and the 4th field-effect tube Q4 of second field-effect tube Q2 connects and is connected to the second primary tap 102.
As shown in Fig. 2, the conducting of 4 field-effect tube is combined with cut-off are as follows: when the first field-effect tube Q1 and the 4th field-effect
When pipe Q4 is simultaneously turned on, the second field-effect tube Q2, third field-effect tube Q3 end simultaneously.When the second field-effect tube Q2 and third field
When effect pipe Q3 is simultaneously turned on, the first field-effect tube Q1, the 4th field-effect tube Q4 end simultaneously.
The first field-effect tube Q1, the 4th field-effect tube Q4 are simultaneously turned on and the second field-effect tube Q2 and third field first
The case where effect pipe Q3 ends simultaneously is illustrated.The source electrode of first field-effect tube Q1 is connect with the drain electrode of third field-effect tube Q3
And it is connected to the first primary tap 101 of transformer TX1, the drain electrode of the 4th field-effect tube Q4 of source electrode of the second field-effect tube Q2 connects
Connect and be connected to the second primary tap 102 of transformer TX1.The drain electrode of first field-effect tube Q1 and the anode of power supply connect,
The grid of first field-effect tube Q1 accesses a driving pulse, so that the first field-effect tube Q1 is connected, generates one group of drain current
(ID) flow to third field-effect tube Q3 drain electrode (at this time on the grid of third field-effect tube Q3 without access driving pulse, so
Third field-effect tube Q3 does not have turn-on condition) and transformer the first tap of armature winding 101, electric current flow through first primary
Then tap 101 flows to the second primary tap 102, flow through the leakage for the 4th field-effect tube Q4 connecting with the second primary tap 102
Pole forms a drain voltage, driving pulse is accessed in the grid of the 4th field-effect tube Q4, so that the 4th field-effect tube Q4 is in
On state, drain current (ID) flow back to external power supply cathode, form one group of circuit.
The second field-effect tube Q2 and third field-effect tube Q3 are simultaneously turned on and the first field-effect tube Q1, the 4th field-effect again
The case where pipe Q4 ends simultaneously is illustrated.For the situation that the first field-effect tube Q1, the 4th field-effect tube Q4 end simultaneously, the
The drain electrode of two field-effect tube Q2 and the anode of external power supply connect, and access a driving arteries and veins in the grid of the second field-effect tube Q2
Punching generates one group of drain current (ID) and flows to the drain electrode of the 4th field-effect tube Q4 (when second so that the second field-effect tube Q2 is connected
When field-effect tube Q2 is in the conductive state, the 4th field-effect tube Q4 is in off state) and transformer TX1 second primary take out
First 102, electric current flows through the second primary tap 201 and then flows to the first primary tap 101, flows through and connects with the first primary tap 101
The drain electrode by third field-effect tube Q3 connect forms a drain voltage, accesses driving in the grid of third field-effect tube Q3
Pulse, so that third field-effect tube Q3 is in the conductive state, drain current (ID) flows back to the cathode of external power supply.
In the present embodiment, in order to realize that third field-effect tube Q3 is delayed in the first field-effect tube Q1 ON/OFF, the
Four field-effect tube Q4 are delayed in the second field-effect tube Q2 ON/OFF, the settable gate driving circuit as shown in 3.Such as Fig. 3 a
And shown in 3b, the grid of the first field-effect tube Q1 is connected to pulse width identical first with the grid of third field-effect tube Q3 and drives
Dynamic signal source S1, the grid of the second field-effect tube Q2 and the grid of the 4th field-effect tube Q4 are connected to pulse width identical the
Two driving signal source S2.
More specifically, gate driving circuit further include first resistor device R1 and third capacitor C3, second resistor R2 with
Second capacitor C2.As shown in Figure 3a, the grid of the first source driving signal S1 and the first field-effect tube Q1 are directly connected to (corresponding
Terminal Vgc Q1).One end of first resistor device R1 is connected on the first source driving signal S1, the other end of first resistor device R1 with
The grid of third field-effect tube Q3 connects (corresponding terminal Vgc Q3), and the grid of third field-effect tube Q3 connects third capacitor
One end of C3, the other end ground connection of third capacitor C3.
As shown in Figure 3b, the grid of the second source driving signal S2 and the second field-effect tube Q2 are directly connected to (corresponding terminal Vgc
Q2).One end of second resistor R2 is connected on the second source driving signal S2, the other end of second resistor R2 and the 4th effect
Should pipe Q4 grid connect (corresponding terminal Vgc Q4), and the 4th field-effect tube Q4 grid connect the second capacitor C2 one
End, the other end ground connection of the second capacitor C2.
First source driving signal S1 and the second source driving signal S2 can produce such as square wave, triangular wave or sawtooth wave isopulse
Waveform.First resistor device R1, second resistor R2 resistance value may be configured as 1K Ω, third capacitor C3, the second capacitor C2
Capacity may be configured as 100pF.Resistor plays inhibition to electric current in circuit, and capacitor plays anti-interference work on circuit
With, since the first field-effect tube Q1 and the second field-effect tube Q2 cannot be simultaneously turned on, third field-effect tube Q3 and the 4th effect
Should pipe Q4 cannot simultaneously turn on, so gate driving circuit use fixed delay circuit, make third field-effect tube Q3 delay in
First field-effect tube Q1 ON/OFF, the 4th field-effect tube Q4 are delayed in the second field-effect tube Q2 ON/OFF.It is driven in grid
In dynamic circuit, the first field-effect tube Q1 source driving signal identical with the available pulse width of third field-effect tube Q3, second
Effect pipe Q2 and the 4th field-effect tube Q4 are connected to the identical source driving signal of pulse width.
In present embodiment, in order to enable heating device can be applied to alternating current circuit, it can be as shown in Figure 1, defeated in alternating current
Enter end connection bridge rectifier, the effect of usual rectifier bridge is the DC voltage that the alternating voltage of pulsation is become to pulsation, whole
In each duty cycle for flowing bridge, the same time only works there are two diode, and bridge rectifier works in positive half cycle
Anode exports forward bias voltage to the first field-effect tube Q1 and the second field-effect tube Q2 simultaneously, and the cathode of bridge rectifier is simultaneously
It is connected with the source electrode of the source electrode of third field-effect tube Q3 and the 4th field-effect tube Q4, provides DC source for entire circuit.
The embodiments of the present invention are described above in conjunction with attached drawing, but the utility model is not limited to
The specific embodiment stated, the above mentioned embodiment is only schematical, rather than restrictive, this field it is common
Technical staff is not departing from the utility model aims and scope of the claimed protection situation under the enlightenment of the utility model
Under, many forms can be also made, these are belonged within the protection of the utility model.
Claims (7)
1. a kind of heating device, which is characterized in that be mainly made of isolating transformer (TX1), resistance wire (L1), the isolation becomes
Depressor (TX1) has armature winding and a secondary windings, and the secondary windings is earth-free and relatively described armature winding electrical isolation,
The secondary windings has the first secondary tap (201) for being located at least in winding both ends, second subprime tap (202) and is located at
Third secondary tap (203) between first secondary tap (201) and second subprime tap (202), first grade
Tap (201) and the second subprime tap (202) are connected to one end of the resistance wire, the third secondary tap simultaneously
(203) it is connected to the other end of the resistance wire (L1), is thus formed in the primary side of the isolating transformer (TX1) to described
The heating current supply circuit of resistance wire (L1) power supply.
2. heating device as described in claim 1, which is characterized in that the heating current supply circuit further includes first diode
(D1) and the second diode (D2), the anode of the first diode (D1) is connect with first secondary tap (201), described
The anode of second diode (D2) is connect with the second subprime tap (202), the cathode of the first diode (D1) and institute
It states the cathode of the second diode (D2) while being connect with one end of the resistance wire (L1).
3. heating device as claimed in claim 1 or 2, which is characterized in that the heating current supply circuit further includes first capacitor
Device (C1), the first capacitor device (C1) are connected to the other end of the third secondary tap (203) and the resistance wire (L1)
Between.
4. heating device as described in claim 1, which is characterized in that the armature winding has the first primary tap (101)
It further include the first field-effect tube (Q1), second in the primary side of the isolating transformer (TX1) with the second primary tap (102)
Field-effect tube (Q2), third field-effect tube (Q3) and the 4th field-effect tube (Q4), first field-effect tube (Q1) with it is described
Third field-effect tube (Q3) series connection, second field-effect tube (Q2) are connected in parallel on again after connecting with the 4th field-effect tube (Q4)
Concatenated first field-effect tube (Q1), the both ends the third field-effect tube (Q3)；
The drain electrode of first field-effect tube (Q1), the drain electrode of second field-effect tube (Q2) while connecting the one of external power supply
End, the source electrode of first field-effect tube (Q1), the source electrode of second field-effect tube (Q2) connect the another of external power supply simultaneously
One end；
The drain electrode of the source electrode of first field-effect tube (Q1) and the third field-effect tube (Q3) is connected and connect to described the
One primary tap (101), the source electrode of second field-effect tube (Q2) are connect simultaneously with the drain electrode of the 4th field-effect tube (Q4)
It is connected to the described second primary tap (102).
5. heating device as claimed in claim 4, which is characterized in that first field-effect tube (Q1) and the third field are imitated
(Q3) should be managed and be connected to identical first source driving signal (S1) of pulse width, second field-effect tube (Q2) and the described 4th
Field-effect tube (Q4) is connected to identical second source driving signal (S2) of pulse width.
6. heating device as claimed in claim 5, which is characterized in that further include first resistor device (R1) and third capacitor
(C3), second resistor (R2) and the second capacitor (C2), first source driving signal (S1) and first field-effect tube
(Q1) grid is directly connected to, and one end of the first resistor device (R1) is connected on first source driving signal (S1), institute
The other end for stating first resistor device (R1) is connect with the grid of the third field-effect tube (Q3), the third field-effect tube (Q3)
Grid connection third capacitor (C3) one end, the third capacitor (C3) the other end ground connection,
The grid of second source driving signal (S2) and second field-effect tube (Q2) is directly connected to, the second resistor
(R2) one end is connected on second source driving signal (S2), the other end and the described 4th of the second resistor (R2)
The grid of field-effect tube (Q4) connects, one end of the grid connection the second capacitor (C2) of the 4th field-effect tube (Q4), institute
State the other end ground connection of the second capacitor (C2).
7. the heating device as described in claim 4 to 6 any one, which is characterized in that in the isolating transformer (TX1)
Primary side further includes rectification unit, the rectification unit be bridge rectifier, the bridge rectifier anode simultaneously with it is described
The drain electrode of first field-effect tube (Q1) is connected with the drain electrode of second field-effect tube (Q2), the cathode of the bridge rectifier
It is connected simultaneously with the source electrode of the source electrode of the third field-effect tube (Q3) and the 4th field-effect tube (Q4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821304448.2U CN208656645U (en) | 2018-08-13 | 2018-08-13 | Heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821304448.2U CN208656645U (en) | 2018-08-13 | 2018-08-13 | Heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208656645U true CN208656645U (en) | 2019-03-26 |
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ID=65789381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821304448.2U Active CN208656645U (en) | 2018-08-13 | 2018-08-13 | Heating device |
Country Status (1)
| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111086180A (en) * | 2019-12-10 | 2020-05-01 | 苏州安驰控制系统有限公司 | Heating control circuit and injection molding machine |
-
2018
- 2018-08-13 CN CN201821304448.2U patent/CN208656645U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111086180A (en) * | 2019-12-10 | 2020-05-01 | 苏州安驰控制系统有限公司 | Heating control circuit and injection molding machine |
| CN111086180B (en) * | 2019-12-10 | 2021-12-17 | 苏州安驰控制系统有限公司 | Heating control circuit and injection molding machine |
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