CN107241027A - Intrinsically-safe power supply device and the transmitter including intrinsically-safe power supply device - Google Patents
Intrinsically-safe power supply device and the transmitter including intrinsically-safe power supply device Download PDFInfo
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- CN107241027A CN107241027A CN201610187266.0A CN201610187266A CN107241027A CN 107241027 A CN107241027 A CN 107241027A CN 201610187266 A CN201610187266 A CN 201610187266A CN 107241027 A CN107241027 A CN 107241027A
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- 238000004804 winding Methods 0.000 claims abstract description 53
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 10
- 230000005284 excitation Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 230000009123 feedback regulation Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 238000002955 isolation Methods 0.000 description 6
- 239000002360 explosive Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
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- Emergency Protection Circuit Devices (AREA)
Abstract
This disclosure relates to intrinsically-safe power supply device and the transmitter including intrinsically-safe power supply device.Included according to the intrinsically-safe power supply device of the disclosure：Transformer, with armature winding and secondary windings, non-intrinsic safety supply voltage is provided to the voltage on armature winding, on-off circuit control armature winding via on-off circuit；Voltage on control unit, its armature winding to transformer sampled and switch based on the voltage output controlling switch circuit on the armature winding sampled control signal；And output unit, it is connected to the secondary windings of transformer and provides intrinsic safety output voltage.At least have the advantages that simple in construction, cost is relatively low and efficiency is improved according to the intrinsically-safe power supply device of the disclosure.
Description
Technical field
This disclosure relates to which a kind of intrinsically-safe power supply device, is entered more particularly, to one kind using winding voltage
The intrinsically-safe power supply device with wide input voltage range of row feedback control.In addition, this disclosure relates to one
Planting includes the transmitter of intrinsically-safe power supply device.
Background technology
Intrinsically-safe power supply device is essential safety source device, is the anti-explosion electric for explosive gas atmosphere
Gas equipment, its discharge energy in extreme circumstances will not light explosive gas.It is therefore desirable to this
Pacifying supply unit has stable voltage output, so as to avoid electric discharge phenomena as far as possible.
Generally, intrinsically-safe power supply device is supplied with non-intrinsic safety supply voltage.The non-intrinsic safety supply voltage is usual
With wider input voltage range.If for example, the rated value of non-intrinsic safety supply voltage is 24
VDC, then supply voltage fluctuation generally in the range of 18VDC to 30VDC.
For security consideration, two circuit-levels are used generally on the basis of above-mentioned non-intrinsic safety supply voltage
The intrinsically-safe power supply device powered come the intrinsically safe circuit part being configured to as industrial system.One of electricity
Road level is used to realizing isolation between non-intrinsically safe circuit part and intrinsically safe circuit part, and another circuit
Level is used to realize feedback regulation to obtain the intrinsic safety output voltage of stable intrinsically-safe power supply device.
The content of the invention
The brief overview of the disclosure is hereinafter will be given for, to provide on some of the disclosure
The basic comprehension of aspect.It should be appreciated that this general introduction is not the exhaustive general introduction on the disclosure.
It is not intended to determine the key or pith of the disclosure, nor the model of the intended limitation disclosure
Enclose.Its purpose only provides some concepts in simplified form, more detailed in this, as what is discussed later
The preamble carefully described.
The present disclosure proposes a kind of intrinsically-safe power supply device, wherein being that can realize this using only stage circuit
Pacify the isolation features and sheet between the non-intrinsically safe circuit part and intrinsically safe circuit part in supply unit
Both feedback regulation functions of pacifying supply unit, while also having the input of wide non-intrinsic safety supply voltage
Voltage range.
According to an aspect of this disclosure there is provided a kind of intrinsically-safe power supply device, it includes：Transformer,
With armature winding and secondary windings, non-intrinsic safety supply voltage via on-off circuit be provided to it is primary around
Voltage on group, on-off circuit control armature winding；Control unit, its armature winding to transformer
On voltage sampled and based on the armature winding sampled voltage output controlling switch electricity
The control signal of the switch on road；And output unit, it is connected to the secondary windings of transformer and carried
For intrinsic safety output voltage.
According to one embodiment of the disclosure, on-off circuit includes switching transistor, and control signal
It is applied to the coordination electrode of switching transistor.
According to another embodiment of the present disclosure, on-off circuit includes the full-bridge electricity being made up of switching transistor
Road, and control signal is applied to the coordination electrode for each switching transistor for constituting full-bridge circuit.
According to one embodiment of the disclosure, voltage of the control unit to the armature winding two ends of transformer
Sampled.
According to another embodiment of the present disclosure, control unit to the specified point of the armature winding of transformer at
Voltage sampled.
According to one embodiment of the disclosure, output unit includes company of being connected with the secondary windings of transformer
The commutation diode and capacitor connect, intrinsic safety output voltage is the voltage at capacitor two ends, and switch
Circuit constitutes circuit of reversed excitation with commutation diode and capacitor.
According to one embodiment of the disclosure, transformer has two or more secondary windings, and
Intrinsically-safe power supply device have with one-to-one two of two or more secondary windings of transformer or
More output units, so as to provide two-way or more road intrinsic safety output voltage.
The pick-up of above-mentioned intrinsically-safe power supply device is included there is provided a kind of according to another aspect of the present disclosure
Device.
The design of power circuit can be simplified according to the intrinsically-safe power supply device of the disclosure, so that with structure
Compact, inexpensive and efficient advantage.
Brief description of the drawings
The disclosure can be by reference to preferably being managed below in association with the description given by accompanying drawing
Solution, wherein having used same or analogous reference in all of the figs to represent same or similar
Part.The accompanying drawing includes in this manual together with following detailed description and forms this
A part for specification, and for preferred embodiment and the explanation of the disclosure is further illustrated
The principle and advantage of the disclosure.
Fig. 1 be a diagram that the circuit block diagram of the intrinsically-safe power supply device of prior art；
Fig. 2 be a diagram that the electricity of the intrinsically-safe power supply device using the photo-coupler O1 feedback control loops constituted
Road block diagram；
Fig. 3 be a diagram that the structured flowchart of the intrinsically-safe power supply device of one embodiment according to the disclosure；
And
Fig. 4 be a diagram that a specific example of intrinsically-safe power supply device in accordance with an embodiment of the present disclosure
Schematic circuit.
Embodiment
It is described hereinafter in connection with accompanying drawing exemplary embodiment of this disclosure.In order to clear
For the sake of simplicity, all features of actual embodiment are not described in the description.However, should
Understand, can make many specific to embodiment party during any this actual embodiment is developed
The decision of formula, to realize the objectives of developer, and these decisions may be with implementation
Mode difference and change.
Herein, in addition it is also necessary to which explanation is a bit, in order to avoid having obscured this public affairs because of unnecessary details
Open, illustrate only in the accompanying drawings and according to the closely related apparatus structure of the scheme of the disclosure, and save
The other details little with disclosure relation are omited.
Illustrate and fed back according to the disclosure using winding voltage in more detail below by accompanying drawing
The intrinsic safety electric source of the wide input voltage range of control.It should be understood that the disclosure be not compromised by it is as follows
Description referring to the drawings and be only limited to described form of implementation.
Fig. 1 illustrates the circuit block diagram of the intrinsically-safe power supply device 10 of prior art.
Intrinsically-safe power supply device 10 shown in Fig. 1 is supplied with non-that such as rated value is 24VDC
Pacify supply voltage V0.As described above, non-intrinsic safety supply voltage V0 is generally in 18VDC to 30
Fluctuated in the range of VDC.
As shown in fig. 1, intrinsically-safe power supply device 10 includes the first circuit-level ST1, second circuit level
ST2 and control unit 1011With 1012。
First circuit-level ST1 is made up of on-off circuit 102, transformer T1 and rectification circuit 103.
Specifically, as shown in fig. 1, non-intrinsic safety supply voltage V0 is carried out by on-off circuit 102
Copped wave, is subsequently applied to the transformer for isolating non-intrinsically safe circuit part and intrinsically safe circuit part
On T1 armature winding Wp.Here, on-off circuit 102 is, for example, to be constituted by switching S1 to S4
Full-bridge circuit.
" non-intrinsically safe circuit part " designated herein refers to transformer T1 armature winding Wp sides
Circuit part, including on-off circuit 102 etc..In addition, " intrinsically safe circuit part " designated herein
Refer to the circuit part of transformer T1 secondary windings Ws sides, including rectification circuit 103 and
Second circuit level ST2 described below etc..
It can be such as switching transistor, such as bipolar transistor to switch S1 to S4.By non-
Pacify the control unit 101 of circuit part side1The control of switch for controlling switch S1 to S4 is provided
Signal, the voltage on armature winding Wp so as to control transformer T1.For example, control is single
Member 1011The signal for the coordination electrode for being applied to each switching transistor S1 to S4 can be provided.
The voltage inducted on transformer T1 secondary windings Ws is carried out whole by rectification circuit 103
Stream, so as to obtain the first circuit-level ST1 output voltage V1.For example, rectified current routing switch S5
Constituted with S6 and commutation diode D1 and D2.Control unit 101 by intrinsically safe circuit part side2
The control signal of switch for controlling switch S5 and S6 is provided.
First circuit-level ST1 is used to isolate non-intrinsically safe circuit part and intrinsic safety electric source part, that is, uses
In realizing isolation features.
Because the first circuit-level ST1 is open loop, therefore the first circuit-level ST1 output voltage V1
It can change with non-intrinsic safety supply voltage V0 change.In view of non-intrinsic safety supply voltage V0 tools
There is wide input voltage range, thus output voltage V1 is unstable.Accordingly, it would be desirable in output
The second circuit level ST2 of closed loop of the addition with feedback regulation function after voltage V1.
For example, second circuit level ST2 can be the step-down controller circuit with feedback control, use
In the output voltage regulation for carrying out intrinsically-safe power supply device 10.The buck converter is by switching S7, inductance
Device L1, capacitor C1 and commutation diode D3 are constituted.By control unit 1012There is provided for controlling
The control signal of S7 switch is switched, so as to realize voltage stabilizing function.
Second circuit level ST2 is used for the function of performing feedback regulation, so as to obtain stable intrinsic safety
Output voltage V2.
Note, in the switch S5 and S6 and second circuit level ST2 in the first circuit-level ST1
Switch S7 is similar to the switch S1 to S4 in the first circuit-level ST1 or for example switchs brilliant
Body pipe, such as bipolar transistor.
Control unit 1011It can provide for controlling each element in non-intrinsically safe circuit part, example
Such as switching transistor S1 to S4 control signal, and control unit 1012It can provide for controlling
The control signal of each element, such as switching transistor S5 to S7 in intrinsically safe circuit part processed.
Then, second circuit level ST2 output voltage V2 is for example, by by fuse and voltage-stabiliser tube structure
Into zena's safety barrier (not shown) be supplied to load to use.
As described above, when producing intrinsic safety output voltage using non-intrinsic safety supply voltage, it is necessary to use
Two circuit-level ST1 and ST2 are respectively completed the function of isolation and feedback regulation, especially the
The inductor L1 for needing to use volume larger in two circuit-level ST2, thus the intrinsic safety electricity of prior art
Source has the shortcomings that complicated, volume is big and cost is high.
In order to overcome disadvantages mentioned above, it may be considered that add feedback regulation in the first circuit-level ST1
Function, so as to realize isolation and feedback regulation simultaneously in stage circuit.In other words so that the
One circuit-level ST1 output voltage V1 fluctuations not with non-intrinsic safety supply voltage V0 and rear end institute
The change of the load of connection and change.Therefore, conventional scheme is added in the first circuit-level ST1
Entering photo-coupler is used for the feedback regulation into line output voltage V1.
Fig. 2 shows the intrinsically-safe power supply device 20 using photo-coupler O1 feedback control loops constituted
Circuit block diagram.
On the basis of Fig. 1 circuit structure, in order to realize the electricity of the output to the first circuit-level ST1
Pressure V1 direct voltage stabilizing adjusts and removes second circuit level ST2, and adding photo-coupler O1 is used for
Realize closed loop feedback.
As shown in Figure 2,204 couple of first circuit-level ST1 of voltage sensing circuit module is passed through first
Output voltage V1 sampled, and sampled signal is sent to feedback compensation circuit module 205.
In feedback compensation circuit module 204 after overcompensation, reflection output voltage V1 state it is anti-
Feedback signal FB is input into the control unit 201 of non-intrinsically safe circuit part side by photo-coupler O1.
Control unit 201 provides the control signal for controlling switch circuit according to feedback signal FB.So as to
Realize the feedback control of closed loop.
However, identical with transformer T1, photo-coupler O1 is also required to be connected across non-intrinsically safe circuit portion
Divide between intrinsically safe circuit part, thus there is the requirement to photo-coupler O1 operating distance.This
Outside, also need to be equipped with electric current and voltage protection circuit (not shown) in photo-coupler O1 both sides.When
So, photo-coupler O1 must also be able to realize feedback function as described above.However, can expire
The photo-coupler of sufficient above-mentioned requirements is considerably less, and the cost of such photo-coupler is very high.
In summary, although stage circuit can be reduced using photo-coupler, intrinsic safety electricity is also increased
The circuit complexity of source device and cost is improved, thus still suffered to simple in construction and with low cost
Intrinsically-safe power supply device the need for.
Fig. 3 illustrates the structured flowchart of the intrinsically-safe power supply device 30 according to one embodiment of the disclosure.
In embodiment of the disclosure, intrinsically-safe power supply device 30 includes：Transformer T1, it has just
Level winding Wp and secondary windings Ws, non-intrinsic safety supply voltage V0 are carried via on-off circuit 302
Supply the voltage on armature winding Wp, the control armature winding of on-off circuit 302 Wp；Control unit
Voltage on 301, its armature winding Wp to transformer T1 is sampled and based on being sampled
Armature winding Wp on voltage output controlling switch circuit 302 switch control signal；And
Output unit 303, it is connected to transformer T1 secondary windings Ws and provides intrinsic safety output electricity
Press Vo.
In accordance with an embodiment of the present disclosure, in the operation of intrinsically-safe power supply device 30, non-intrinsically safe circuit portion
The control unit 301 of point side is sampled to the voltage on transformer T1 armature winding Wp, is made
For feedback signal corresponding with output voltage Vo.So, control unit 301 can be according to the feedback
The switch of signal control switch circuit 302, so that the voltage on armature winding Wp is controlled, therefore it is real
Existing output voltage Vo feedback regulation.In this way, intrinsic safety electricity is realized in stage circuit
The function of both the isolation of source device and feedback regulation.
As an example, control unit 301 can be to transformer T1 armature winding Wp two ends
Voltage sample, the voltage at the specified point on transformer T1 armature winding Wp can also be entered
Row sampling, no matter to which of two above voltage voltage sample as feedback signal, can be anti-
Reflect non-intrinsic safety supply voltage V0 change.
Fig. 4 illustrates a specific example of intrinsically-safe power supply device 30 in accordance with an embodiment of the present disclosure
Schematic circuit.
As shown in Figure 4, on-off circuit 302 can be made up of such as single switch S31.Switch
S31 can be switching transistor, such as bipolar transistor.
The voltage at the collection transformer of control unit 301 T1 armature winding Wp two ends is used as feedback letter
Number, and the control signal of the switch for controlling switch S31 is provided according to the feedback signal, so that
Control the voltage on armature winding Wp.For example, control voltage can be applied to by control unit 301
Constitute the base stage as coordination electrode of switch S31 bipolar transistor.
Output unit 303 shown in Fig. 4 is made up of capacitor C31 and commutation diode D31.
The intrinsic safety output voltage of intrinsically-safe power supply device 30 is the voltage at capacitor C31 two ends.Such as institute in Fig. 4
Show, switch S31, capacitor C31 and diode D31 constitute circuit of reversed excitation, wherein switching S31
The primary side of circuit of reversed excitation is constituted, capacitor C31 and diode D31 constitute the secondary of circuit of reversed excitation.
The circuit of reversed excitation is operated under the control of the control unit 301 so that the energy of intrinsically-safe power supply device 30
It is enough that stable intrinsic safety output voltage Vo is provided.
For example, control unit 301 shown in Fig. 4 can by Linear Techn Inc. device LT3748
Realize.In addition, also many commercial devices can also act as the control unit 301 shown in Fig. 4.
Thus, the intrinsically-safe power supply device shown in Fig. 4 has compact conformation, inexpensive and efficient advantage.
It is 24 that table 1, which is listed for the rated value fluctuated in the range of 10VDC to 30VDC,
VDC non-intrinsic safety supply voltage V0 and different load current conditions, shown in Fig. 4
Intrinsically-safe power supply device 30 circuit structure obtain intrinsic safety output voltage Vo.
| Non- intrinsic safety supply voltage (V) | Load current conditions (mA) | Intrinsic safety output voltage (V) |
| 10 | 40 | 13.41 |
| 10 | 200 | 13.29 |
| 24 | 40 | 13.39 |
| 24 | 200 | 13.34 |
| 30 | 40 | 13.37 |
| 30 | 200 | 13.33 |
Table 1：Intrinsic safety output voltage under different non-intrinsic safety supply voltages and different load current conditions
As seen from Table 1, even if non-intrinsic safety supply voltage V0 10VDC to 30VDC model
Interior fluctuation is enclosed, load current is fluctuated in the range of 40mA and 200mA, intrinsically-safe power supply device
The intrinsic safety output voltage Vo that 30 circuit structure is obtained is still extremely stable.Thus, according to this public affairs
The intrinsically-safe power supply device opened has wide input voltage range.
In figures 3 and 4, transformer T1 only has a secondary windings, and intrinsically-safe power supply device
30 only have an output unit 303, for providing intrinsic safety output voltage all the way.However, the disclosure
Not limited to this.Transformer T1 can also have two or more secondary windings, and intrinsic safety electric source
Device has with two or more secondary windings of transformer that one-to-one two or more are defeated
Go out unit, so as to provide two-way or more road intrinsic safety output voltage.
Alternatively, on-off circuit 302 can also be by including four as shown in Figure 1
The full-bridge circuit for switching S1 to S4 is constituted.
As shown in Figure 4, than the circuit structure of the intrinsically-safe power supply device shown in Fig. 1 and Fig. 2,
The circuit structure of the disclosure does not need the second circuit level for feedback regulation shown in Fig. 1, not yet
The photo-coupler for being used to feed back as shown in Figure 2 is needed, thus reduced with simple in construction, cost,
The remarkable advantage that efficiency is improved, but also with wide input voltage range.
Various industrial circles can be widely applied to according to the intrinsically-safe power supply device of the disclosure.Especially
Ground, although describing the intrinsically-safe power supply device of the disclosure above in association with accompanying drawing, the disclosure is further related to
A kind of transmitter, it can include intrinsically-safe power supply device as described above, by the intrinsically-safe power supply device
Powered for the transmitter, so that transmitter correspondingly obtains technique effect as described above.
Although being draped over one's shoulders above by the description of specific embodiment of this disclosure to the disclosure
Dew, however, it is to be understood that those skilled in the art can be in spirit and scope of the appended claims
Interior design various modifications of this disclosure, improvement or equivalent.These modifications, improvement or equivalent
Thing should also be as being to be considered as included in the protection domain of the disclosure.
It should be emphasized that term "comprises/comprising" refers to feature, key element, step or group when being used herein
The presence of part, but it is not precluded from the presence of one or more further features, key element, step or component
Or it is additional.It is related to the term " first " of ordinal number, " second " etc. is not offered as what these terms were limited
Feature, key element, the implementation order of step or component or importance degree, and just for the sake of description
It is used to be identified between these features, key element, step or component for the sake of clear.
Claims (8)
1. a kind of intrinsically-safe power supply device, including：
Transformer, with armature winding and secondary windings, non-intrinsic safety supply voltage is via on-off circuit quilt
The armature winding is supplied to, the on-off circuit controls the voltage on the armature winding；
Voltage on control unit, its armature winding to the transformer is sampled and based on institute
Voltage output on the armature winding of sampling controls the control signal of the switch of the on-off circuit；
And
Output unit, it is connected to the secondary windings of the transformer and provides intrinsic safety output voltage.
2. intrinsically-safe power supply device according to claim 1, wherein
The on-off circuit includes switching transistor, and the control signal is applied to the switch crystalline substance
The coordination electrode of body pipe.
3. intrinsically-safe power supply device according to claim 1, wherein
The on-off circuit includes the full-bridge circuit being made up of switching transistor, and the control signal
It is applied to the coordination electrode for each switching transistor for constituting the full-bridge circuit.
4. intrinsically-safe power supply device according to any one of claim 1 to 3, wherein
Described control unit is sampled to the voltage at the armature winding two ends of the transformer.
5. intrinsically-safe power supply device according to any one of claim 1 to 3, wherein
Described control unit is sampled to the voltage at the specified point of the armature winding of the transformer.
6. intrinsically-safe power supply device according to claim 1, wherein
The output unit includes the commutation diode being connected in series with the secondary windings of the transformer
And capacitor, the intrinsic safety output voltage is the voltage at the capacitor two ends, and
The on-off circuit constitutes circuit of reversed excitation with the commutation diode and the capacitor.
7. intrinsically-safe power supply device according to any one of the preceding claims, wherein
The transformer has two or more secondary windings, and
The intrinsically-safe power supply device has with two or more secondary windings of the transformer one by one
Two or more corresponding output units, so as to provide two-way or more road intrinsic safety output electricity
Pressure.
8. a kind of transmitter, it is characterised in that including according to any one of claim 1 to 7
Intrinsically-safe power supply device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610187266.0A CN107241027A (en) | 2016-03-29 | 2016-03-29 | Intrinsically-safe power supply device and the transmitter including intrinsically-safe power supply device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610187266.0A CN107241027A (en) | 2016-03-29 | 2016-03-29 | Intrinsically-safe power supply device and the transmitter including intrinsically-safe power supply device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115116710A (en) * | 2022-06-22 | 2022-09-27 | 浙江中控技术股份有限公司 | Intrinsic safety planar transformer for isolated safety barrier |
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| CN205725492U (en) * | 2016-03-29 | 2016-11-23 | 高准有限公司 | Intrinsically-safe power supply device and the transmitter including intrinsically-safe power supply device |
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| CN103227568A (en) * | 2012-01-26 | 2013-07-31 | 凌力尔特公司 | Flyback converter with primary side voltage sensing and overvoltage protection during low load operation |
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Application publication date: 20171010 |