CN103887965B - Power Management Design circuit with high-grade EMC and safety performance - Google Patents
Power Management Design circuit with high-grade EMC and safety performance Download PDFInfo
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- CN103887965B CN103887965B CN201210554633.8A CN201210554633A CN103887965B CN 103887965 B CN103887965 B CN 103887965B CN 201210554633 A CN201210554633 A CN 201210554633A CN 103887965 B CN103887965 B CN 103887965B
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Abstract
The present invention is suitable for track transportation industry, provide a kind of Power Management Design circuit with high-grade EMC and safety performance, including sequentially connected input unit, isolation filter protection location and output unit, the isolation filter protection location includes electromagnetic immunity and protects circuit, electromagnetic interference filter circuit and isolation circuit, the electromagnetic immunity protection circuit common mode interference signal that exports input unit and DM EMI signal clamper are simultaneously released, the input signal of the isolation circuit and output signal are carried out common mode filtering and the input signal of the isolation circuit are carried out differential mode filtering by electromagnetic interference filter circuit.By setting electromagnetic immunity that circuit and isolation circuit is protected to isolate input unit with output unit; and carry out pcb board line space design; it is made to meet the isolated insulation voltage of bigger; improve pressure-resistant performance; the interference signal that electromagnetic interference filter circuit exports input unit simultaneously is filtered so that meets the limit value requirement of radiation and the conduction of circuit.
Description
Technical field
The invention belongs to electronic device field more particularly to a kind of Power Management Designs with high-grade EMC and safety performance
Circuit.
Background technology
At present, more and more applied to track transportation industry electronic equipment, due to occurring security incident again and again on railway,
Track transportation industry EMC (Electro Magnetic Compatibility, Electro Magnetic Compatibility) requirements are stringenter.Such as Fig. 1
It is shown, it is the circuit diagram for the power circuit that a tradition has safety performance design, input and output do not carry out isolation and set
Meter with causing input and exports ground directly conducting, as long as there is high pressure in outside, will be directly entered the internal circuit of equipment, cause
Machine breakdown, and the spacing that insulate in PCB layout cannot not enough meet industry requirement, it is pressure-resistant not reach requirement.As shown in Fig. 2,
There is the circuit diagram of the power circuit of EMC performances for another tradition, wherein, component is put out of alignment in circuit
Really, as shown in figure, diode D11 actuation times are ps grades, and varistor RV1 actuation times are s grades of μ, in addition, in lightning stroke shape
Under state, diode D11 will be acted before varistor RV1, but because diode D11 resistant to flows are too small, easy breakdown, pressure-sensitive electricity
Resistance RV1 loses protective effect, so that lacking common mode or differential mode filter protective circuit, causes finally to be extremely difficult to preferable effect.
The content of the invention
The embodiment of the present invention be designed to provide a kind of EMC immunities to interference, pressure-resistant performance it is strong there is high-grade EMC and peace
Advise the Power Management Design circuit of performance, it is intended to which solving tradition has circuit in high-grade EMC and the Power Management Design circuit of safety performance
Design it is unreasonable caused by EMC immunities to interference, the problem of pressure-resistant performance is weak.
The embodiment of the present invention is achieved in that a kind of Power Management Design circuit with high-grade EMC and safety performance, bag
Sequentially connected input unit, isolation filter protection location and output unit are included, the isolation filter protection location includes connection
Electromagnetic immunity protection circuit, EMI Filtering electricity between the output terminal of the input unit and the input terminal of output unit
Road and the isolation circuit for isolating the input unit and output unit, the electromagnetic immunity protect circuit by the input
The common mode interference signal and DM EMI signal clamper of unit output are simultaneously released, and clamper refers to the current potential of certain point being limited in regulation
Current potential more than measure, the electromagnetic interference filter circuit by the input signal of the isolation circuit and output signal be total to
Mould filters and the input signal of the isolation circuit is carried out differential mode filtering.
In a preferred embodiment, electromagnetic immunity protection circuit is included for clamper and the common mode disturbance voltage of releasing
Common mode protection circuit protects circuit and the second differential mode protection electricity for the first differential mode of clamper and the differential mode disturbance volt of releasing
Road, the electromagnetic interference filter circuit include the differential mode filtered electrical for filtering out the DM EMI of the isolation circuit input signal
Road inputs altogether for filtering out the first of the common mode interference of the input signal of the isolation circuit the input common mode filtering circuit and second
Mould filter circuit and the output common mode filter circuit for filtering out the common mode interference of the output signal of the isolation circuit, it is described
Common mode protection circuit, the first differential mode protection circuit, differential mode filter circuit, the first input common mode filtering circuit, the protection of the second differential mode
Circuit, the second input common mode filtering circuit, isolation circuit and output common mode filter circuit are connected to the input unit in turn
Between output terminal and the input terminal of output unit.
In a preferred embodiment, in the wiring of pcb board, the wiring spacing of the input unit and output unit is many
In 400 Mills.
In a preferred embodiment, anode wiring, cathode wiring and the isolation filter protection of the input unit are single
Wiring spacing in member between the pin of each component and ground terminal is more than 110 Mills.
In a preferred embodiment, the common mode protection circuit includes varistor RV3 and varistor RV2, the pressure
The first end of quick resistance RV3, the first end of the varistor RV2 are connected respectively with the anode of the input unit, cathode, institute
State the second end of varistor RV3 and the second end ground connection of the varistor RV2.
The isolation filter protection location further includes the fuse F10 that first end is connected to the input unit anode, institute
Stating the first differential mode protection circuit includes the pressure being connected between the second end of the fuse F10 and the cathode of the input unit
Quick resistance RV1.
In a preferred embodiment, the isolation filter protection location further includes diode D10, the differential mode filter circuit
Including differential mode inductance L3, differential mode inductance L4 and capacitance C3, wherein,
The diode D10 anodes are connected with the second end of the fuse F10, the cathode of the diode D10 and institute
The connection of differential mode inductance L3 first ends is stated, the differential mode inductance L3 second ends are connected with the first end of the capacitance C3, the capacitance
The second end of C3 is connected with the first end of the differential mode inductance L4, second end and the input unit of the differential mode inductance L4
Cathode connects.
In a preferred embodiment, the first input common mode filtering circuit includes common mode inductance L1, the common mode inductance
First end, second end of two input terminals of L1 respectively with the capacitance C3 are connected；
Second differential mode protection circuit is Transient Suppression Diode D11, the Transient Suppression Diode D11 first ends with
The first output terminal connection of the common mode inductance L1, the second end of the Transient Suppression Diode D11 are electric with the common mode simultaneously
Feel the second output terminal of L1 and the connection of input ground；
The second input common mode filtering circuit includes capacitance C1 and capacitance C7, the first end of the capacitance C1, the electricity
The first end for holding C7 is connected respectively with the first output terminal of the common mode inductance L1, second output terminal, and the second of the capacitance C1
The second end of end and capacitance C7 are grounded.
In a preferred embodiment, the isolation circuit electrode input end, negative input respectively with the common mode inductance
The first output terminal of L1, second output terminal connection, the output common mode filter circuit include capacitance C2 and capacitance C8, the capacitance
The first end of C2 is connected with the isolation circuit cathode output end, the first end of the capacitance C8 and the cathode of the isolation circuit
Output terminal connects, the second end of the capacitance C2 and the second end ground connection of capacitance C8.
In a preferred embodiment, the isolation filter protection location is further included with the Transient Suppression Diode D11 simultaneously
The residual voltage bleeder resistance R1 and electrolytic capacitor CE6, the electrolytic capacitor CE6 of connection are in parallel with the residual voltage bleeder resistance R1, described
The anode of electrolytic capacitor CE6 is connected with the first output terminal of the common mode inductance L1.
In a preferred embodiment, the isolation filter protection location further includes electrolytic capacitor CE1 and filter connected in parallel
Ripple output capacitance C6, the anode of the electrolytic capacitor CE1 are connected with the isolation circuit cathode output end, the electrolytic capacitor
The cathode of CE1 is connected and is grounded with the isolation circuit cathode output end, and the output unit is being connected to isolation circuit 260 just
Pole output terminal.
The above-mentioned Power Management Design circuit with high-grade EMC and safety performance by set electromagnetic immunity protect circuit and every
Input unit with output unit is isolated from circuit, and carries out pcb board line space design, it is made to meet the isolation of bigger exhausted
Edge voltage improves pressure-resistant performance, while the interference signal that electromagnetic interference filter circuit exports input unit is filtered, full
The EMC immunities to interference of sufficient DC power supply so that meet the limit value requirement of radiation and the conduction of circuit.
Description of the drawings
Fig. 1 is the circuit diagram for the conventional safety performance power circuit that a prior art provides；
Fig. 2 is the power circuit principle figure with EMC performances that another prior art provides；
Fig. 3 is the circuit mould of the Power Management Design circuit provided in an embodiment of the present invention with high-grade EMC and safety performance
Block diagram；
Fig. 4 is the Power Management Design circuit PCB with high-grade EMC and safety performance that another embodiment of the present invention provides
Plate wire structures block diagram；
Fig. 5 is the Power Management Design circuit pcb board wiring provided in an embodiment of the present invention with high-grade EMC and safety performance
Structure diagram；
Fig. 6 is the schematic diagram of the Power Management Design circuit provided in an embodiment of the present invention with high-grade EMC and safety performance.
Specific embodiment
In order to which technical problems, technical solutions and advantageous effects to be solved by the present invention are more clearly understood, below in conjunction with
Accompanying drawings and embodiments, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
As shown in figure 3, a kind of Power Management Design circuit with high-grade EMC and safety performance, including sequentially connected defeated
Enter unit 100, isolation filter protection location 200 and output unit 300.
Isolation filter protection location 200 includes being connected to the output terminal of input unit 100 and the input terminal of output unit 300
Between electromagnetic immunity protection circuit 220, electromagnetic interference filter circuit 240 and input unit 100 and output unit 300 are carried out
The isolation circuit 260 of isolation, the common mode interference signal and differential mode that electromagnetic immunity protection circuit 220 exports input unit 100 are done
Disturb signal clamper and release, clamper refer to by the current potential of certain point be limited in as defined in more than current potential measure, EMI Filtering
The input signal of isolation circuit 260 and output signal are carried out common mode filtering and believe the input of isolation circuit 260 by circuit 240
Number carry out differential mode filtering.
Set electromagnetic immunity protect circuit 220 and isolation circuit 260 by input unit 100 and output unit 300 carry out every
From, and pcb board line space design is carried out, it is made to meet the isolated insulation voltage of bigger, improves pressure-resistant performance, while electromagnetism is done
Filter circuit 220 is disturbed, the voltage disturbance signal inputted to input unit 100 is filtered.Meet EMC Requirements, especially
It is the EMC Requirements of the DC power supply in track traffic.
In a preferred embodiment, electromagnetic immunity protection circuit 220 is included for clamper and common mode disturbance voltage of releasing
Common mode protection circuit 222 is protected for the first differential mode of clamper and differential mode disturbance volt of releasing 224 and second differential mode of protection circuit
Circuit 226, electromagnetic interference filter circuit 240 include filtering out the differential mode filter of the DM EMI of 260 input signal of isolation circuit
Wave circuit 242 inputs common mode filtering circuit for filtering out the first of the common mode interference of the input signal of the isolation circuit 260
244 and second input common mode filtering circuit 246, are total to for filtering out the output of the common mode interference of the output signal of isolation circuit 260
Mould filter circuit 248.Common mode protection circuit 222, the first differential mode protection circuit 224, the input of differential mode filter circuit 242, first are altogether
Mould filter circuit 244, the second differential mode protection circuit 226, second input common mode filtering circuit 246, isolation circuit 260 and output altogether
Mould filter circuit 248 is connected between the output terminal of input unit 100 and the input terminal of output unit 300.In the present embodiment, every
It is voltage isolation module from circuit 260, for being converted to input signal so that input signal is opened with output signal isolation
Come；It is arranged on common mode protection circuit 222, the first differential mode of the Power Management Design circuit front-end with high-grade EMC and safety performance
Protection circuit 224 and second differential mode protection circuit 226 makees electromagnetic immunity protection, ensures the pressure-resistant performance of circuit, thereafter, differential mode filter
Wave circuit 242, first inputs common mode filtering circuit 244, second and inputs common mode filtering circuit 246 and output common mode filter circuit
248 pairs of voltages protected by electromagnetic immunity after 220 clamper of circuit are filtered and residual voltage are released.
As shown in Figure 4,5, in the wiring of pcb board, the wiring spacing H of input unit 100 and output unit 300 is no less than
400 Mills.
The above-mentioned Power Management Design circuit with high-grade EMC and safety performance is single by being inputted unit 100 and output
First 300 wiring spacing in the wiring of pcb board is no less than 400 Mills, and the signal for preventing input is re-coupled to output
In, the immunity to interference of Power Management Design circuit of the raising with high-grade EMC and safety performance so that meet the radiation and conduction of circuit
Limit value requirement.
Fig. 4 and Fig. 5 distributions are shown with two kinds of pcb board wirings of high-grade EMC and the Power Management Design circuit of safety performance
In layout, the circuit of the two needs to widen wiring spacing H as far as possible, makes for structure diagram, input unit 100 and output unit 300
Be at least 400 Mills, that is to say, that input unit 100 is filtered and clamper protection after export, output unit 300 need with
Input unit 100 is kept apart, and the signal for preventing input is re-coupled in output, it is preferable that as shown in figure 4, will be defeated
Enter unit 100 and output unit 300 is designed to make anti-do positioned at the opposite sides of isolation filter protection location 200 to widen distance
Disturb protection.
In a preferred embodiment, anode wiring, cathode wiring and the isolation filter protection location 200 of input unit 100
In wiring spacing between the pin of each component and ground terminal GND_BASE be more than 110 Mills（It is not shown）.Ensure input unit
Each component in 100 anodes, cathode and isolation filter protection location 200 does not go out to the alternating voltage for applying 1500V between ground
Existing electric discharge phenomena, meet the isolated insulation voltage of bigger, improve pressure-resistant performance so that meet the limit of radiation and the conduction of circuit
Value requirement.
As shown in fig. 6, in a preferred embodiment, common mode protection circuit 222 is located at the connection of input unit 100 and isolates filter
Ripple protection location 200 includes varistor RV3 and varistor close to the front end of input unit 100, common mode protection circuit 222
The first end of RV2, varistor RV3, the first end of varistor RV2 are connected respectively with the anode of input unit 100, cathode,
The second end of varistor RV3, the second end of varistor RV2 ground connection GND_BASE.Varistor RV3 and varistor RV2
Clamper is carried out to the common mode disturbance voltage of input, this scheme can pass through the disturbed test of common mode 2000V voltages.
In a preferred embodiment, isolation filter protection location 200 further includes first end and is connected to 100 anode of input unit
Fuse F10, the first differential mode protection circuit 224 includes being connected to the second end of fuse F10 and the cathode of input unit 100
Between varistor RV1.In other embodiments, fuse F10 can be replaced with fuse.
In a preferred embodiment, it is anti-reverse two pole that isolation filter protection location 200, which further includes diode D10, D10,
Pipe, differential mode filter circuit 242 include differential mode inductance L3, differential mode inductance L4 and capacitance C3.Diode D10 anodes and fuse F10
Second end connection, the cathode of diode D10 is connected with differential mode inductance L3 first ends, the differential mode inductance L3 second ends and capacitance
The first end connection of C3, the second end of capacitance C3 is connected with the first end of differential mode inductance L4, the second end of differential mode inductance L4 with it is defeated
Enter the cathode connection of unit 100.Capacitance C3 is X capacitances, for inhibiting DM EMI.
In a preferred embodiment, first input common mode filtering circuit 244 include common mode inductance L1, the two of common mode inductance L1
A input terminal is connected respectively with the first end of capacitance C3, second end.Second differential mode protection circuit 226 is Transient Suppression Diode
D11, Transient Suppression Diode D11 first ends are connected with the first output terminal of common mode inductance L1, and the of Transient Suppression Diode D11
Two ends are connected simultaneously with the second output terminal of common mode inductance L1 and input ground GND_IN.Second input common mode filtering circuit 246 wraps
Include capacitance C1 and capacitance C7, the first end of capacitance C1, the first end of capacitance C7 respectively with the first output terminal of common mode inductance L1,
Two output terminals connect, the second end of capacitance C1 and the second end ground connection GND_BASE of capacitance C7.
In a preferred embodiment, 260 electrode input end of isolation circuit, negative input respectively with common mode inductance L1
One output terminal, second output terminal connection.
Varistor RV1 in first differential mode protection circuit 224 and second differential mode protection circuit 226 does the differential mode of input
It disturbs voltage and carries out clamper, Transient Suppression Diode D11 releases the remaining residual voltage after clamper, this scheme can pass through
The disturbed test of differential mode 1000V voltages.
In the present embodiment, when DM EMI signal enters the Power Management Design circuit with high-grade EMC and safety performance,
Varistor RV1 is acted the relatively low voltage of DM EMI clamper, while differential mode inductance L3 and differential mode inductance L4 also have resistance
Hinder the variation of interference, after differential mode inductance L3 and differential mode inductance L4 if voltage transient inhibit diode D11 will puncture it is dynamic
It releases differential mode energy, differential mode voltage is reduced to the clamp voltage of Transient Suppression Diode D11, so as to be carried out to late-class circuit
Protection.
In a preferred embodiment, 260 electrode input end of isolation circuit, negative input respectively with common mode inductance L1
One output terminal, second output terminal connection, output common mode filter circuit 248 include capacitance C2 and capacitance C8, the first end of capacitance C2
It is connected with 260 cathode output end of isolation circuit, the first end of capacitance C8 is connected with the cathode output end of isolation circuit 260, capacitance
The second end of C2 and the second end ground connection GND_BASE of capacitance C8.Capacitance C1, capacitance C2, capacitance C7 and capacitance C8 are Y capacitance, are used
It is disturbed in suppression common mode.
In this embodiment, when common mode disturbance voltage enters the Power Management Design circuit with high-grade EMC and safety performance, pressure
Quick resistance RV3 and varistor RV2 action, by common mode disturbance voltage clamper to varistor RV3 and varistor RV2 most
Big clamp voltage, the interference after varistor RV3 and varistor RV2 enter common mode inductance L1, the spy of common mode inductance L1
Property can prevent interference variation, the rise time of voltage is slowed down, part residual voltage can be released to greatly by capacitance C1 and capacitance C7
Ground, it is without damage so as to reach protection rear class power module circuitry.
In a preferred embodiment, isolation filter protection location 200 further includes in parallel with Transient Suppression Diode D11 residual
It is big valued resistor to press bleeder resistance R1 and electrolytic capacitor CE6, residual voltage bleeder resistance R1, and at least 1000 ohm, resistance value is preferably
1000 ohm, electrolytic capacitor CE6 is in parallel with residual voltage bleeder resistance R1, the anode of electrolytic capacitor CE6 and the first of common mode inductance L1
Output terminal connects.
In a preferred embodiment, isolation filter protection location 200 further includes electrolytic capacitor CE1 and filtering connected in parallel
The anode of output capacitance C6, electrolytic capacitor CE1 are connected with 260 cathode output end of isolation circuit, the cathode of electrolytic capacitor CE1 with every
It is connected from 260 cathode output end of circuit and meets output ground GND_OUT, the anode that output unit 300 is connected to isolation circuit 260 is defeated
Outlet.
The foregoing is merely a prefered embodiment of the invention, is not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made within principle etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of Power Management Design circuit with high-grade EMC and safety performance, including sequentially connected input unit, isolation filter
Ripple protection location and output unit, which is characterized in that the wiring spacing of the input unit and the output unit in pcb board
No less than 400 Mills, the signal for preventing input are re-coupled in output, and the isolation filter protection location includes connection
Fuse F10 or fuse, electromagnetic immunity protection between the output terminal of the input unit and the input terminal of output unit
Circuit, diode D10, electromagnetic interference filter circuit and the isolation circuit for isolating the input unit and output unit,
The electromagnetic immunity protection circuit includes common mode protection circuit, the first differential mode protection circuit and the second differential mode protection circuit, wherein,
The second differential mode protection circuit is Transient Suppression Diode D11, and the electromagnetic immunity protection circuit is defeated by the input unit
The common mode interference signal and DM EMI signal clamper that go out simultaneously are released, and the electromagnetic interference filter circuit is by the isolation circuit
Input signal and output signal carry out common mode filtering and the input signal of the isolation circuit are carried out differential mode filtering, it is described every
It is used to convert input signal from circuit so that input signal comes with output signal isolation.
2. there is high-grade EMC and the Power Management Design circuit of safety performance as described in claim 1, which is characterized in that described
Electromagnetic interference filter circuit includes filtering out the differential mode filter circuit of the DM EMI of the isolation circuit input signal, be used for
Filter out the first input common mode filtering circuit and the second input common mode filtering of the common mode interference of the input signal of the isolation circuit
Circuit and the output common mode filter circuit for filtering out the common mode interference of the output signal of the isolation circuit, the common mode are protected
Protection circuit, the first differential mode protection circuit, differential mode filter circuit, the first input common mode filtering circuit, the second differential mode protection circuit, the
Two input common mode filtering circuits, isolation circuit and output common mode filter circuit be connected in turn the input unit output terminal and
Between the input terminal of output unit.
3. there is high-grade EMC and the Power Management Design circuit of safety performance as described in claim 1, which is characterized in that described
Input unit anode wiring, cathode wiring and the isolation filter protection location in each component pin and ground terminal between
It connects up spacing and is more than 110 Mills.
4. there is high-grade EMC and the Power Management Design circuit of safety performance as claimed in claim 2, which is characterized in that described
Common mode protection circuit includes varistor RV3 and varistor RV2, the first end of the varistor RV3, the varistor
The first end of RV2 is connected respectively with the anode of the input unit, cathode, the second end and the pressure of the varistor RV3
The second end ground connection of quick resistance RV2,
The first end of the fuse F10 connects the anode of the input unit, and the first differential mode protection circuit includes connection
Varistor RV1 between the second end of the fuse F10 and the cathode of the input unit.
5. there is high-grade EMC and the Power Management Design circuit of safety performance as claimed in claim 4, which is characterized in that described
Differential mode filter circuit includes differential mode inductance L3, differential mode inductance L4 and capacitance C3, wherein,
The anode of the diode D10 is connected with the fuse F10 second ends, cathode and the difference of the diode D10
Mould inductance L3 first ends connect, and the differential mode inductance L3 second ends are connected with the first end of the capacitance C3, the capacitance C3's
Second end is connected with the first end of the differential mode inductance L4, the second end of the differential mode inductance L4 and the cathode of the input unit
Connection.
6. there is high-grade EMC and the Power Management Design circuit of safety performance as claimed in claim 5, which is characterized in that described
Two input terminals of the first input common mode filtering circuit including common mode inductance L1, the common mode inductance L1 respectively with the capacitance C3
First end, second end connection；
The Transient Suppression Diode D11 first ends are connected with the first output terminal of the common mode inductance L1, and the transient state inhibits
The second end of diode D11 is connected simultaneously with the second output terminal of the common mode inductance L1 and input；
The second input common mode filtering circuit includes capacitance C1 and capacitance C7, the first end of the capacitance C1, the capacitance C7
First end be connected respectively with the first output terminal of the common mode inductance L1, second output terminal, the second end of the capacitance C1 and
The second end ground connection of capacitance C7.
7. there is high-grade EMC and the Power Management Design circuit of safety performance as claimed in claim 6, which is characterized in that described
Isolation circuit electrode input end, negative input are connected respectively with the first output terminal of the common mode inductance L1, second output terminal,
The output common mode filter circuit includes capacitance C2 and capacitance C8, and the first end of the capacitance C2 and the isolation circuit cathode are defeated
Outlet connects, and the first end of the capacitance C8 is connected with the cathode output end of the isolation circuit, the second end of the capacitance C2
It is grounded with the second end of capacitance C8.
8. there is high-grade EMC and the Power Management Design circuit of safety performance as claimed in claim 6, which is characterized in that described
Isolation filter protection location further includes the residual voltage bleeder resistance R1 and electrolytic capacitor in parallel with the Transient Suppression Diode D11
CE6, the electrolytic capacitor CE6 are in parallel with the residual voltage bleeder resistance R1, anode and the common mode electricity of the electrolytic capacitor CE6
Feel the first output terminal connection of L1.
9. as claim 1 to 8 any one of them has high-grade EMC and the Power Management Design circuit of safety performance, feature
It is, the isolation filter protection location further includes electrolytic capacitor CE1 and filtering output capacitance C6 connected in parallel, the electrolysis
The anode of capacitance CE1 is connected with the isolation circuit cathode output end, cathode and the isolation circuit of the electrolytic capacitor CE1
Cathode output end connects and connects output ground, and the output unit is connected to the cathode output end of isolation circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210554633.8A CN103887965B (en) | 2012-12-19 | 2012-12-19 | Power Management Design circuit with high-grade EMC and safety performance |
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| CN201210554633.8A CN103887965B (en) | 2012-12-19 | 2012-12-19 | Power Management Design circuit with high-grade EMC and safety performance |
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| CN103887965B true CN103887965B (en) | 2018-05-29 |
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| CN103887965A (en) | 2014-06-25 |
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