CN208924134U - A kind of exchange turns direct-current isolating switch power circuit - Google Patents
A kind of exchange turns direct-current isolating switch power circuit Download PDFInfo
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- CN208924134U CN208924134U CN201821485012.8U CN201821485012U CN208924134U CN 208924134 U CN208924134 U CN 208924134U CN 201821485012 U CN201821485012 U CN 201821485012U CN 208924134 U CN208924134 U CN 208924134U
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Abstract
The utility model discloses a kind of exchange and turns direct-current isolating switch power circuit, including rectification circuit, filter circuit, the first circuit for power conversion, power conversion transformer, the second circuit for power conversion, first group of DC output circuit, second group of DC output circuit, using the topological structure different from previous reverse exciting topological power, two groups of voltages being mutually isolated are outputed.First circuit for power conversion working principle is identical as high pressure BUCK circuit operation principle, therefore the voltage stress of required power switch tube is reduced, a vice-side winding need to be only added in power conversion transformer, i.e., exportable one group is that second group of rear end DC output circuit is powered with the mutually isolated power supply of first group of DC output circuit.Final cost of implementation is suitable with linear transformer, small-power switching power-supply similar in performance and former reverse exciting topological power.
Description
Technical field
The utility model relates to a kind of small-power Low-cost alternating-currents to turn direct-current isolating switch power source design, be mainly used in electricity
There are insulating requirements on road, needs to be isolated the common electric energy meter of electronic single-phase of power supply.
Background technique
Ammeter industry all has communication function substantially, makes electricity in electric energy meter design other than guaranteeing function of measuring at present
Can table can automatically or semi-automatically meter reading, alleviate meter reading personnel labor intensity and improve meter reading data accuracy.Under the pressure of at
This pressure, the common electric energy meter of electronic single-phase is in terms of communication generally using modes such as RS-485 or RS-232.This communication side
Formula is low to requirements for power supply power, is usually only necessary to 1~2 watt, but electric energy meter will inevitably reserve the low pressure of wiring needed for communicating
Terminal (< 40V) needs and the HV Terminals (> such as alternating voltage input according to these low-voltage terminals of electric energy meter demand of technical standard
40V) isolation (insulation 4KVAC).Therefore in electric energy meter hardware circuit design, we at least need to provide two groups it is mutually isolated
Power supply, respectively metering MCU circuit and the power supply of RS-485 communicating circuit.
In order to meet demand of technical standard in previous industry, the small-power power that exchange turns direct current generallys use linear transformation
Device power supply or reverse exciting topological Switching Power Supply, exporting two groups of mutually isolated power supplys is respectively to measure MCU circuit and RS-485
Communicating circuit power supply.
Following problems present in the above-mentioned prior art:
Linear transformer small-power power: output two-way, it is at low cost although circuit is simple, it is wide that requirement can not be applied to
The power grid environment of range input voltage, in electric energy meter market, application aspect is limited to；
Inverse-excitation type small-power switching power-supply: output two-way is suitable for wide scope power grid environment, circuit is with respect to transformer frequency response
Complexity, the basic principle based on reverse exciting topological power, corresponding high frequency transformer must need 4 windings (such as attached drawing 1:N1 around
Group, N2 winding, N3 winding, N4 winding), power switch tube voltage stress is big, and stress voltage V is inputted most in addition to power grid itself
High Level DC Voltage Vin_DCmax further includes that the voltage Vor and primary side transformer leakage inductance of secondary output reflection to primary side are generated outside
Due to voltage spikes Vlk (V=Vin_DCmax+Vor+Vlk).So even power requirement power very little, according to reverse exciting topological electricity
Source, can be various because of the voltage stress and high frequency transformer winding of power switch tube in terms of cost, be unable to reach with linear power supply at
This is quite.
Utility model content
In response to the above problems, the present invention proposes a kind of small-power Low-cost alternating-currents to turn direct-current isolating switch power supply electricity
Road scheme, exporting two groups of mutually isolated voltages is that the common electric energy meter of electronic single-phase measures MCU circuit and RS-485 communication electricity
Road isolation power supply, meets electric energy meter demand of technical standard.
The utility model uses following technical scheme:
A kind of exchange turns direct-current isolating switch power circuit, including the rectification circuit, filter circuit, the first function being sequentially connected
Rate conversion circuit and first group of DC output circuit: the switching power circuit further includes power conversion transformer T2, Yi Ji electricity
Property connection the second circuit for power conversion and second group of DC output circuit；The primary side winding of the power conversion transformer T2 is made
For the inductance N1 in the first circuit for power conversion, vice-side winding realizes first as the inductance N2 in the second circuit for power conversion
Circuit for power conversion and the second circuit for power conversion it is mutually isolated.
Further, the rectification circuit is rear end for converting alternating current to the relatively high Rectified alternating current of amplitude
Power conversion is prepared.
Further, first circuit for power conversion includes power switch tube Q2, storage capacitor CP20, freewheeling diode
DP8, capacitor CP19 and inductance N1；Wherein power switch tube Q2 drain electrode is electrically connected with filter circuit output end, and source electrode is connected to
The foot 1 of inductance N1；Storage capacitor CP20 anode connects the foot 2 of inductance N1, and cathode is grounded GND1；Sustained diode P8 plus earth
GND1, cathode connect the foot 1 of inductance N1；Capacitor CP19 anode connects power switch tube Q2 drain electrode, and cathode is grounded GND1.
Further, first circuit for power conversion further includes pwm control circuit and voltage feedback circuit；Wherein voltage is anti-
Current feed circuit includes for being carried out for the electric current after rectifying by the diode DP6 of high frequency pulse AC electric rectification on inductance N1
The capacitor CP14 of filtering, and the d. c. voltage signal that is formed on sampling capacitance CP14 and input the pwm control circuit
Divider resistance RP12 and RP14；The pwm control circuit output end is connected with the base stage of power switch tube Q2.
Further, first group of DC output circuit includes inductance LP2 and capacitor CP21；Wherein capacitor CP21 anode
It is connected to storage capacitor CP20 anode through inductance LP2, cathode is grounded GND1.
Further, second circuit for power conversion includes inductance N2, storage capacitor CP17, sustained diode P7 and electricity
Hinder RP13；Wherein the foot 4 of inductance N2 is connected to storage capacitor CP17 anode through resistance RP13, and storage capacitor CP17 cathode connects stream two
Pole pipe DP7 anode, sustained diode P7 cathode connect the foot 3 of inductance N2.
Further, second group of DC output circuit includes inductance LP4 and capacitor CP18；Wherein capacitor CP18 anode
It is connected to storage capacitor CP17 anode through inductance LP4, cathode is grounded GND2.
Further, when the power switch tube Q2 is connected, inductance N1 and inductance N2 energy storage, capacitor CP19 and storage capacitor
CP17 is respectively first group of DC output circuit, second group of DC output circuit power supply；When power switch tube Q2 is turned off, inductance N1
Constituting primary side freewheeling circuit with storage capacitor CP20, sustained diode P8 is that first group of DC output circuit is powered；Inductance N2,
It is second group of DC output circuit power supply that resistance RP13, storage capacitor CP17, sustained diode P7, which constitute secondary side freewheeling circuit,.
Further, bridging has Y between first group of DC output circuit and the ground terminal of second group of DC output circuit
Capacitor CY2.
Further, the filter circuit is for preventing power conversion process high-frequency noises from sealing in the other electricity of electric network influencing
Sub- equipment works normally, while preventing the interference noise of part power grid from entering the first circuit for power conversion influence normal work of power supply
Make.
Preferably, the filter circuit is capacitor CP22, the CLC filter circuit of inductance LP1, capacitor CP19 composition,
Middle capacitor CP19 storage capacitor as first circuit for power conversion simultaneously.
Further, it further includes the exchange input lightning protection circuit being electrically connected that the exchange, which turns direct-current isolating switch power circuit,
And excess voltage protection, wherein exchange input lightning protection circuit input terminal connects alternating current, excess voltage protection output end connects
Connect rectification circuit input end.The overvoltage spike that exchange input lightning protection circuit is used to inhibit lightning surge etc. instantaneous, protects rear end
Circuit devcie, excess voltage protection is for preventing the common electric energy meter of electronic single-phase in actual use because of ground fault
Etc. overvoltage is damaged in short-term caused by reasons.
Preferably, the exchange input lightning protection circuit is varistor MOV3.
Preferably, excess voltage protection uses composite thermistor RT3.
Preferably, rectification circuit uses diode DP5.
In the utility model, power conversion transformer T2 primary side winding plays always a power electricity in whole work process
The effect of sense.First circuit for power conversion working principle is consistent with high pressure BUCK Topology Switch power work principle, thus power
Switching tube Q2 stress voltage V is only the highest DC voltage Vin_DCmax that power grid itself inputs, so comparing reverse exciting topological
The voltage stress of Switching Power Supply, power switch tube Q2 declines to a great extent, and reduces power supply cost indirectly.In addition, power converts transformation
Device T2 vice-side winding and primary side winding totally one high frequency transformer magnetic core, but mutually indepedent, electric insulation between two windings, thus
Keep the first circuit for power conversion, the second circuit for power conversion mutually isolated, be finally powered at two-way mutually isolated first group it is straight
Flow output circuit and second group of DC output circuit.And due to sharing a magnetic core, when power switch tube Q2 is connected, inductance N1
With inductance N2 energy storage simultaneously；When power switch tube Q2 is turned off, inductance N2 is constituted with storage capacitor CP17, sustained diode P7
Secondary side freewheeling circuit is second group of DC output circuit power supply, and the stability of output voltage is then former secondary by power conversion transformer T2
The turn ratio relationship and coupling condition of side winding determine, without individually addition secondary side feedback circuit.
Compared with prior art, the utility model has the following beneficial effects: using different from previous reverse exciting topological power
Topological structure, the first circuit for power conversion working principle is identical as high pressure BUCK circuit operation principle, therefore reduces the first function
The voltage stress of power switch tube needed for rate conversion circuit also eliminates RCD compared to reverse exciting topological Switching Power Supply and absorbs electricity
Road, auxiliary winding power supply circuit etc., make switching power source device quantity designed by solution reduce, circuit it is simpler, at
Sheet is lower (approaching and linear transformer small-power power).
In addition, need to only add a vice-side winding (inductance N2) in power conversion transformer can convert with the second power
Freewheeling diode, storage capacitor in circuit constitute freewheeling circuit, and one group of output is mutually isolated with first group of DC output circuit
Power supply be rear end second group of DC output circuit power supply.Reduce power conversion transformer compared to reverse exciting topological Switching Power Supply
Winding quantity, therefore consumptive material needed for reducing high frequency transformer coiling reduces Switching Power Supply overall cost indirectly.
At the same time, this solution controls quickly leading for power switch tube equally using PWM pulse width modulation mode
Logical and shutdown, achievees the purpose that stabilize the output voltage.Therefore identical as reverse exciting topological Switching Power Supply in performance to be completely suitable for
The environment of wide scope power grid makes up the deficiency of linear transformer small-power power.
The utility model solves the not foot point of linear power supply, makes to be suitable for wide scope power grid environment, while using newly
Topological power structure, circuit are simple compared with the reverse exciting topological power used in the past, reduce high frequency transformer winding, power switch
Tube voltage stress reduces, and final cost of implementation is suitable with linear transformer, small function similar in performance and former reverse exciting topological power
Rate Switching Power Supply.
Detailed description of the invention
Fig. 1 is reverse exciting topological power schematic diagram.
Fig. 2 is the functional block diagram of the utility model.
Fig. 3 is the circuit diagram of the utility model.
Specific embodiment
Technical solutions of the utility model in order to facilitate understanding carry out specifically below in conjunction with attached drawing 2-3 and specific embodiment
It is bright.
A kind of exchange of small-power low cost turns direct-current isolating switch power circuit, including exchange input lightning protection circuit, mistake
Voltage protection circuit, rectification circuit, EMI filter circuit, the first circuit for power conversion, power conversion transformer T2, the second power
Conversion circuit, first group of DC output circuit, second group of DC output circuit；Functional block diagram such as Fig. 2 institute between each circuit
Show, circuit diagram is as shown in Figure 3.
(1) exchange input lightning protection circuit: single phase ac inputs lightning protection circuit unit using conventional use of anti-on electric energy meter
Thunder device: varistor MOV3, the overvoltage spike for inhibiting lightning surge etc. instantaneous protect back-end circuit device, connection
Between the firewire L and zero curve N of alternating current.
(2) excess voltage protection: it is connected to exchange input lightning protection circuit rear end, rectification circuit front end is based on single-phase electricity
In sub common electric energy meter technical specification power supply need to keep out the requirement of overvoltage in short-term caused by the reasons such as ground fault and it is low at
This requirement, excess voltage protection is using overvoltage protecting device conventional in linear small-power power: compound temperature-sensitive RT3.
(3) rectification circuit: being connected to excess voltage protection rear end, and EMI filter circuit front end is common in electronic single-phase
It in electric energy meter, is connected directly to the reference of usual firewire and metering chip on table, therefore is carried out using a general-purpose diode DP5
Halfwave rectifier is as rectification circuit.
(4) rectification circuit rear end, the first circuit for power conversion front end EMI filter circuit: are connected to.In order to preferably filter out
Power grid high-frequency noise jamming power supply, and power supply itself is inhibited to interfere extraneous high-frequency noise, EMI filter circuit is filtered using CLC
Wave mode is made of capacitor CP22, inductance LP1, capacitor CP19.Capacitor CP22 generallys use safety X capacitor, and capacitor CP19 is same
When as the first circuit for power conversion of rear end high-voltage energy storage capacitor, usually electrolytic capacitor.Capacitor CP19 cathode is grounded GND1,
Anode the first circuit for power conversion of access.
(5) first circuit for power conversion: including pwm control circuit, power switch tube Q2, storage capacitor CP20, afterflow two
Pole pipe DP8, capacitor CP19, inductance N1 (primary side winding of power conversion transformer T2) and voltage feedback circuit.Herein, capacitor
CP19 is both the original part of EMI filter circuit and an original part of the first circuit for power conversion.In circuit, after alternating current is rectified
Rectified alternating current, can not be directly as the voltage source of the first circuit for power conversion, it is necessary to by the high pressure in EMI filter circuit
Capacitor CP19 filtering and energy storage, then could provide relative smooth, stable voltage source for the first circuit for power conversion input terminal.
In order to which more convenient, simple, reliable realization power is converted and is controlled, in case study on implementation, using being integrated with power
The switching power source chip MP173 of switching tube Q2, pwm control circuit, the power switch that switching power source chip MP173 is internally integrated
Pipe Q2 is metal-oxide-semiconductor, the anode of the high-voltage energy storage capacitor CP19 in the drain D connection EMI filter circuit of metal-oxide-semiconductor, source level S conduct
The level reference base (the level Zero potential reference of switching power source chip MP173) of pwm control circuit is quasi- to be connected to inductance N1's
Foot 1, storage capacitor CP20 are low pressure storage capacitor, and anode connects the foot 2 of inductance N1, and cathode is grounded GND1；Sustained diode P8
((i.e. storage capacitor CP20 cathode is connected with sustained diode P8 anode, capacitor CP19 cathode), cathode connects plus earth GND1
The foot 1 of inductance N1 and the source level S of power switch tube Q2；
The voltage feedback circuit includes diode DP6, inductance CP14, divider resistance RP12, RP14, and diode DP6 is used
In by high frequency pulse AC electric rectification on inductance N1, (alternating current becomes Rectified alternating current, frequency 100HZ after rectification circuit
Left and right, and " high frequency pulse AC electricity " here refers to the both ends inductance N1 during power switch tube Q2 high speed turn-on and turn-off
The high frequency pulse AC electricity of formation, the frequency of the high speed turn-on and turn-off is identical as pwm control signal, is tens KHZ), high frequency
Then pulse direct current passes through and capacitor through being filtered to form metastable direct current with the concatenated capacitor CP14 of diode DP6
The DC voltage of divider resistance RP12, RP14 of CP14 parallel connection, divider resistance RP12, RP14 for being formed on sampling capacitance CP14
Signal, and the FB foot of pwm control circuit, that is, input pin are accessed, with switching power source chip MP173 internal reference voltage
Vref adjusts the different size of pwm signal of output more in real time, controls holding time for the on, off of power switch tube Q2,
To control inductance N1 and inductance N2 energy storage and discharge time, achieve the purpose that stablize two groups of isolation voltages of output；The PWM control
Circuit output end processed is connected with the base stage of power switch tube Q2；Pwm control circuit output pwm signal controls power switch tube Q2
Shutdown, power switch tube Q2 be connected when, the relatively high direct current of amplitude, by inductance N1 energy storage, while for first group it is straight
Flow output circuit power supply；When power switch tube Q2 is disconnected, inductance N1 constitutes primary side through sustained diode P8, storage capacitor CP20
Freewheeling circuit continues as first group of DC output circuit power supply, and the stability of supply voltage is controlled by voltage feedback circuit.CP15
As the filter capacitor of switching power source chip MP173 voltage sampling signal, it is parallel to pwm control circuit FB foot and power switch tube
Between the source level S of Q2, keep voltage sampling signal more stable, clean, promotes power supply output stability.CP16 is as Switching Power Supply
The decoupling capacitor of chip MP173 power supply foot VCC, filters out the extraneous noise for being coupled to power end, keeps chip operation more stable.
In embodiment, capacitor CP19, power switch tube Q2, inductance N1, sustained diode P8, storage capacitor CP20, jointly
Constitute the circuit for being identical to high pressure BUCK Switching Power Supply.
When power switch tube Q2 is connected, the first circuit for power conversion trend: capacitor CP19 anode > power switch tube Q2 drain electrode
D > power switch tube Q2 source level S > inductance N1 foot 1 > inductance N1 2 > storage capacitor of foot CP20 anode > storage capacitor CP20 is negative
Pole > capacitor CP19 cathode；
When power switch tube Q2 is turned off, the first circuit for power conversion trend: the anode of 2 > storage capacitor of foot CP20 of N1 is felt
The cathode of > storage capacitor CP20 > sustained diode P8 anode > sustained diode P8 cathode > inductance N1 foot 1.
(6) first groups of DC output circuits: the direct current that the first circuit for power conversion is formed is supplied to first group of direct current output
Circuit is the power supply of the metering circuits such as MCU.First group of DC output circuit includes inductance LP2, capacitor CP21, wherein capacitor CP21
Anode is connected to storage capacitor CP20 anode through inductance LP2, and cathode is grounded GND1.The effect of inductance LP2, capacitor CP21 are to first
The direct current that circuit for power conversion is formed carries out LC filtering, reduces Ripple Noise, is that the MCU of the common electric energy meter of electronic single-phase is counted
It measures circuit and more stable DC is provided.
(7) second circuit for power conversion: including storage capacitor CP17, sustained diode P7, resistance RP13, inductance N2 (function
The vice-side winding of rate conversion transformer T2), resistance RP13 is used to inhibit the surge current of power supply electrifying moment, and resistance value when necessary may be used
Think 0 ohm.Wherein the foot 4 of inductance N2 is connected to storage capacitor CP17 anode through resistance RP13, and storage capacitor CP17 cathode connects
Diode DP7 anode is flowed, sustained diode P7 cathode connects the foot 3 of inductance N2.
The foot 4 of inductance N2 and the foot 2 of inductance N1 are Same Name of Ends.
Inductance N2 and resistance RP13, storage capacitor CP17, sustained diode P7 constitute secondary side freewheeling circuit.Power switch
When pipe Q2 is connected, inductance N1 and inductance N2 energy storage, capacitor CP19 and storage capacitor CP17 are respectively first group of direct current output respectively
Circuit, second group of DC output circuit power supply；When power switch tube Q2 is turned off, inductance N1 and storage capacitor CP20, two pole of afterflow
It is first group of DC output circuit power supply that pipe DP8, which constitutes primary side freewheeling circuit,；Secondary side freewheeling circuit is second group of direct current output electricity
Road power supply, the stability of output voltage are then determined by the turn ratio relationship and coupling condition of power conversion transformer T2 original vice-side winding
It is fixed, without individually addition secondary side feedback circuit.
(8) second groups of DC output circuits: including inductance LP4, capacitor CP18, wherein capacitor CP18 anode is through inductance LP4
It is connected to storage capacitor CP17 anode, cathode is grounded GND2.The effect of inductance LP4, capacitor CP18 are to the second rate conversion circuit
The direct current of formation carries out LC filtering, reduces Ripple Noise, and providing more stable DC is the common electric energy of electronic single-phase
The power supply of the communicating circuits such as the RS-485 of table.
It is connected across the ground terminal GND1 of first group of DC output circuit and the ground terminal GND2 of second group of DC output circuit
Between Y capacitance CY2 the purpose of be to improve the external radiation-emitting noise amplitudes of power supply.
Above are merely preferred embodiments of the utility model, the protection scope of the utility model is limited with claim
Range subject to, several improvement and profit that those skilled in the art make without departing from the spirit and scope of the utility model
Decorations, also should be regarded as the protection scope of the utility model.
Claims (10)
1. a kind of exchange turns direct-current isolating switch power circuit, including the rectification circuit, filter circuit, the first power being sequentially connected
Conversion circuit and first group of DC output circuit, it is characterised in that: the switching power circuit further includes power conversion transformer
T2, and the second circuit for power conversion and second group of DC output circuit that are electrically connected；The power conversion transformer T2's
Primary side winding is as the inductance N1 in the first circuit for power conversion, and vice-side winding is as the inductance in the second circuit for power conversion
N2 realizes the mutually isolated of the first circuit for power conversion and the second circuit for power conversion.
2. exchange as described in claim 1 turns direct-current isolating switch power circuit, it is characterised in that: the first power conversion
Circuit includes power switch tube Q2, storage capacitor CP20, sustained diode P8, capacitor CP19 and inductance N1；Wherein power switch
Pipe Q2 drain electrode is electrically connected with filter circuit output end, and source electrode is connected to the foot 1 of inductance N1；Storage capacitor CP20 anode connects inductance
The foot 2 of N1, cathode are grounded GND1；Sustained diode P8 plus earth GND1, cathode connect the foot 1 of inductance N1；Capacitor CP19 anode
Power switch tube Q2 drain electrode is connect, cathode is grounded GND1.
3. exchange as claimed in claim 2 turns direct-current isolating switch power circuit, it is characterised in that: the first power conversion
Circuit further includes pwm control circuit and voltage feedback circuit；Wherein voltage feedback circuit includes for by high frequency arteries and veins on inductance N1
The diode DP6 for rushing AC rectification, the capacitor CP14 for the electric current after rectification to be filtered, and it is used for sampling capacitance
The d. c. voltage signal that is formed on CP14 and the divider resistance RP12 and RP14 for inputting the pwm control circuit；The PWM control
Circuit output end processed is connected with the base stage of power switch tube Q2.
4. exchange as claimed in claim 2 turns direct-current isolating switch power circuit, it is characterised in that: first group of direct current is defeated
Circuit includes inductance LP2 and capacitor CP21 out；Wherein capacitor CP21 anode is connected to storage capacitor CP20 anode through inductance LP2, bears
Pole is grounded GND1.
5. exchange as claimed in claim 1 or 2 turns direct-current isolating switch power circuit, it is characterised in that: second power
Conversion circuit includes inductance N2, storage capacitor CP17, sustained diode P7 and resistance RP13；Wherein the foot 4 of inductance N2 is through resistance
RP13 is connected to storage capacitor CP17 anode, and storage capacitor CP17 cathode connects freewheeling diode DP7 anode, and sustained diode P7 is negative
Pole connects the foot 3 of inductance N2.
6. exchange as claimed in claim 5 turns direct-current isolating switch power circuit, it is characterised in that: second group of direct current is defeated
Circuit includes inductance LP4 and capacitor CP18 out；Wherein capacitor CP18 anode is connected to storage capacitor CP17 anode through inductance LP4,
Cathode is grounded GND2.
7. exchange as described in claim 1 turns direct-current isolating switch power circuit, it is characterised in that: the filter circuit is electricity
Hold the CLC filter circuit of CP22, inductance LP1, capacitor CP19 composition, wherein capacitor CP19 is converted as first power simultaneously
The storage capacitor of circuit.
8. exchange as described in claim 1 turns direct-current isolating switch power circuit, it is characterised in that: first group of direct current is defeated
Bridging has Y capacitance CY2 between circuit and the ground terminal of second group of DC output circuit out.
9. exchange as claimed in claim 8 turns direct-current isolating switch power circuit, it is characterised in that: the switching power circuit
It further include the exchange input lightning protection circuit and excess voltage protection being electrically connected, wherein exchange input lightning protection circuit input terminal connects
Alternating current is connect, excess voltage protection output end connects rectification circuit input end.
10. exchange as claimed in claim 9 turns direct-current isolating switch power circuit, it is characterised in that: the exchange input is anti-
Thunder and lightning road is varistor MOV3, and excess voltage protection uses composite thermistor RT3, and rectification circuit uses diode DP5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821485012.8U CN208924134U (en) | 2018-09-12 | 2018-09-12 | A kind of exchange turns direct-current isolating switch power circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821485012.8U CN208924134U (en) | 2018-09-12 | 2018-09-12 | A kind of exchange turns direct-current isolating switch power circuit |
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| CN208924134U true CN208924134U (en) | 2019-05-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112838771A (en) * | 2020-04-08 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Instant electric water heater and power circuit thereof |
| CN113114061A (en) * | 2021-03-26 | 2021-07-13 | 台达电子企业管理（上海）有限公司 | Converter and method for suppressing circulating current interference of converter |
-
2018
- 2018-09-12 CN CN201821485012.8U patent/CN208924134U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112838771A (en) * | 2020-04-08 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Instant electric water heater and power circuit thereof |
| CN113114061A (en) * | 2021-03-26 | 2021-07-13 | 台达电子企业管理（上海）有限公司 | Converter and method for suppressing circulating current interference of converter |
| US12003192B2 (en) | 2021-03-26 | 2024-06-04 | Delta Electronics (Shanghai) Co.,Ltd. | Converter and method for suppressing loop interference of converter |
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