CN207184347U - A kind of ac-dc converter circuit - Google Patents
A kind of ac-dc converter circuit Download PDFInfo
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- CN207184347U CN207184347U CN201720873513.2U CN201720873513U CN207184347U CN 207184347 U CN207184347 U CN 207184347U CN 201720873513 U CN201720873513 U CN 201720873513U CN 207184347 U CN207184347 U CN 207184347U
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Abstract
A kind of ac-dc converter circuit, including the first filter circuit, rectification circuit, the second filter circuit, low-voltage protection circuit, drive circuit and transforming circuit；The input connection of first filter circuit and rectification circuit; the output end of rectification circuit is connected output drive signal with the second filter circuit; the drive signal is connected with low-voltage protection circuit power end; low-voltage protection circuit output end is connected with drive circuit, and drive circuit exports steady dc voltage by transforming circuit.When the utility model is by low-voltage protection circuit driver operating on low voltage, when input voltage is less than normal working voltage, pulling off driving power prevents driver from working；When input voltage recovers normal working voltage, driver recovers normal work automatically, so as to solve the problems such as too low caused operating efficiency of input voltage is low, heating is serious, prevention causes driver failure even fire incident, so as to provide galvanic current.
Description
Technical field
D/C power application field is the utility model is related to, more particularly to a kind of ac-dc converter circuit.
Background technology
As country widelys popularize to energy-conserving product, in the market for the demand of D/C power and LED driver increasingly
Greatly, while to the security of matched load and equipment higher requirement is proposed.
Because fixed ON time APFC scheme applications are more and more ripe, the competition of wide input voltage product commercially
Power is more superior, and removing few part power supply control chip on the market has outside input voltage measurement and input low-voltage variation function, big portion
Part driving chip is without this function, and circuit is constantly in work during due to input low pressure, and it is low overall efficiency to be present, insurance
The major defect such as resistance and the heating of poor common mode inductance, cause driver failure even fire incident.
The utility model patent thinking is that solve to work during driver low pressure, when the input voltage is less than normal working voltage
Pulling off driving power prevents driver from working；When input voltage recovers normal, driver recovers normal work automatically, solves
The problems such as excessively inefficient low heating of input voltage is serious.
Utility model content
The purpose of this utility model is overcome the deficiencies in the prior art, there is provided a kind of ac-dc converter circuit.
Technical scheme is used by the utility model solves its technical problem：A kind of ac-dc converter circuit, including the
One filter circuit, rectification circuit, the second filter circuit, low-voltage protection circuit, drive circuit and transforming circuit；First filter
The input of wave circuit and rectification circuit connects, and the output end of rectification circuit is connected output drive signal with the second filter circuit,
The drive signal is connected with low-voltage protection circuit power end, and low-voltage protection circuit output end is connected with drive circuit, driving electricity
Road exports steady dc voltage by transforming circuit；First filter circuit, including fuse F11, common mode inductance L11,
Common mode inductance L12 and electric capacity C11；Exchange live wire is connected with fuse F11 first end, and fuse F11 the second end is together
The first end connection of mould inductance L11 first coils, the second end and the common mode inductance L12 First Lines of common mode inductance L11 first coils
The first end connection of circle, it is the second end of common mode inductance L12 first coils and electric capacity C11 first end, the first of rectification circuit defeated
Enter end connection；Exchange zero line together the coils of mould inductance L11 second first end connection, the second of the coils of common mode inductance L11 second
End is connected with the second end of common mode inductance L12 first coils, and the of the second end of the coils of common mode inductance L12 second and electric capacity C11
Two ends, the second input connection of rectification circuit.
Preferably, second filter circuit, including inductance L21, resistance RS21, resistance RS23, resistance RS24, electric capacity
C21-C23, diode DS21 and piezo-resistance VD11；First output end of the rectification circuit and inductance L21 first end,
Resistance RS21 first end and electric capacity C21 first end connection, inductance L21 the second end and resistance RS21 the second end, electricity
Hold C21 first end, piezo-resistance VD11 first end and diode DS21 positive pole connection output drive signal；Diode
DS21 negative pole is connected with resistance RS23 first end, electric capacity C23 first end, and resistance RS23 the second end is with resistance RS24's
First end connects；Second output end of the rectification circuit and electric capacity C21 the second end, electric capacity C22 the second end, piezo-resistance
Second end at VD11 the second end, resistance RS24 the second end and electric capacity C23 connects and is grounded.
Preferably, the low-voltage protection circuit, including voltage-stabiliser tube ZS61-ZS63, diode DS61, resistance R61-
R65, electric capacity C61, electric capacity CS62, inductance L41B and triode QS61- QS62；The drive signal and the voltage-stabiliser tube
ZS62 negative pole connection, voltage-stabiliser tube ZS62 positive pole by resistance RS63 and voltage-stabiliser tube ZS63 negative pole, electric capacity CS62 first
The first end connection at end, resistance RS64 first end and resistance RS65, resistance RS65 the second end and triode QS62 base
Pole connects, triode QS62 emitter stage and voltage-stabiliser tube ZS61 negative pole, resistance RS62 first end and triode QS61
Base stage connection, triode QS61 emitter stage output control signal, triode QS61 colelctor electrode and resistance RS62 the second end,
The negative electrode connection of electric capacity C61 first end, electric capacity CS61 first end and diode DS61, diode DS61 anode and electricity
RS61 first end connection is hindered, resistance RS61 the second end is connected with inductance L41B first end, voltage-stabiliser tube ZS63 positive pole, electricity
Hold CS62 the second end, resistance RS64 the second end, triode QS62 colelctor electrode, voltage-stabiliser tube ZS61 positive pole, electric capacity C61
Second end at the second end, electric capacity CS61 the second end and inductance L41B connects and is grounded.
When input voltage is normal, the voltage Vbus of drive signal is higher than voltage-stabiliser tube ZS62+ZS63 voltage stabilizing value, voltage-stabiliser tube
The ZS63 a little higher than voltage-stabiliser tube ZS61 of voltage of voltage regulation voltage stabilizing value, so that triode QS62 can not be turned on, voltage control chip
US31 power end Vcc power supplies are normal, voltage control chip US31 normal works.When input voltage is reduced to voltage-stabiliser tube ZS63 not
During conducting, triode QS62 base voltage will be determined by Vbus, ZS62, RS63 and RS64, because of ZS62, RS63 and
RS64 resistance is all fixed, so QS62 base voltage will be determined by Vbus.Simultaneously because QS62, QS61 Vbe electricity
Pressure is cancelled out each other, and at this moment US31 Vcc voltage is equal to triode QS62 base voltage, that is to say, that US31 Vcc electricity
Pressure is determined that US31 will not work when Vbus voltages are reduced to US31 Vcc input low pressure thresholds, into beating by Vbus completely
Belch pattern.When Vbus continues to drop into the threshold voltage less than ZS62, ZS62 is not turned on, and US31 Vcc will be held in the mouth position, complete
Do not work entirely.When Vbus voltage recovery normal working voltages, Vcc will come back to normal value, and US31 reworks.RS63 determines
Determine the electric current and power consumption above ZS62, ZS63, while also have certain influence on no-load power consumption.
Preferably, the drive circuit, including the control of resistance RS31-RS33, resistance RS35A, resistance RS35B, voltage
Chip US31, electric capacity CS41, electric capacity C62, inductance LS41, metal-oxide-semiconductor Q41 and diode DS32；The voltage control chip
The US31 chip for model BP3319MB；The drive signal after electric resistance partial pressure with voltage control chip US31 6
The first end connection at end, the control signal of the low-voltage protection circuit and electric capacity C62, electric capacity C62 the second end and voltage control
8 ends of coremaking piece connect and are grounded；Voltage control chip US31 common port is connected to ground by electric capacity；Voltage control chip
US31 5 ends are connected with resistance RS31 first end, resistance RS32 first end, resistance RS32 the second end and diode DS32
Negative pole connection, diode DS32 positive pole is connected with the grid at resistance RS31 the second end, metal-oxide-semiconductor Q41 and passes through resistance
RS33 is connected with metal-oxide-semiconductor Q41 source electrode, voltage control chip US31 3 ends and passes through resistance eutral grounding；Metal-oxide-semiconductor Q41 drain electrode
Pass through inductance LS41 output voltage signals；Voltage control chip US31 2 ends are grounded by resistance RS35B；Voltage control chip
US31 2 ends are connected by resistance RS35A with the second end of the RS61；Voltage control chip US31 6 ends by electric capacity with
Voltage control chip US31 8 ends connect and are grounded.
Preferably, the transforming circuit, including inductance L41A, diode D41, electric capacity C43A, electric capacity C43B, resistance
RS46 and common mode inductance L13；The first end of the inductance L41A and the drive signal, electric capacity C43A first end, electric capacity
The first end connection of C43B first end, resistance RS46 first end and common mode inductance L13 first coils；The of inductance L41A
Two ends are connected with the positive pole of the voltage signal and diode D41；Diode D41 negative pole and electric capacity C43A the second end,
The first end at electric capacity C43B the second end, resistance RS46 the second end and the coils of common mode inductance L13 second is connected and is grounded；Altogether
The positive pole of the second end output direct current of mould inductance L13 first coils, the second end output direct current of the coils of common mode inductance L13 second
The negative pole of electricity.
Preferably, the inductance L41A, inductance L41B are the inductance with magnetic core.
The beneficial effects of the utility model：During by low-voltage protection circuit driver operating on low voltage, work as input voltage
During less than normal working voltage, pulling off driving power prevents driver from working；When input voltage recovers normal working voltage,
Driver recovers normal work automatically, so as to solve the problems such as too low caused operating efficiency of input voltage is low, heating is serious,
Prevention causes driver failure even fire incident, so as to provide galvanic current.
Brief description of the drawings
Fig. 1 is a kind of structured flowchart of the present utility model；
Fig. 2 is a kind of electrical schematic diagram of the present utility model.
In figure：The filter circuits of 1- first, 2- rectification circuits, the filter circuits of 3- second, 4- low-voltage protection circuits, 5- driving electricity
Road, 6- transforming circuits.
Embodiment
Below by specific embodiment, and with reference to accompanying drawing, the technical solution of the utility model is made further specifically
It is bright.
A kind of ac-dc converter circuit, as shown in figure 1, including the first filter circuit 1, rectification circuit 2, the second filter circuit
3rd, low-voltage protection circuit 4, drive circuit 5 and transforming circuit 6；The input of first filter circuit 1 and rectification circuit 2 connects
Connect, the output end of rectification circuit 2 is connected output drive signal, drive signal and the electricity of low-voltage protection circuit 4 with the second filter circuit 3
Source is connected, and the output end of low-voltage protection circuit 4 is connected with drive circuit 5, and drive circuit 5 exports stabilization by transforming circuit 6
DC voltage.
As shown in Figure 2, the first filter circuit 1 includes fuse F11, common mode inductance L11, common mode inductance L12 and electric capacity
C11；Exchange live wire is connected with fuse F11 first end, fuse F11 the second end and common mode inductance L11 first coils
First end is connected, and the second end of common mode inductance L11 first coils is connected with the first end of common mode inductance L12 first coils, common mode
Second end of inductance L12 first coils is connected with the first input end of electric capacity C11 first end, rectification circuit 2；Exchange zero line with
The first end connection of the coils of common mode inductance L11 second, the second end and the common mode inductance L12 first of the coils of common mode inductance L11 second
The second end connection of coil, the second end of the coils of common mode inductance L12 second and electric capacity C11 the second end, the second of rectification circuit 2
Input connects.
Second filter circuit 3, including inductance L21, resistance RS21, resistance RS23, resistance RS24, electric capacity C21-C23,
Diode DS21 and piezo-resistance VD11；First output end of the rectification circuit 2 and inductance L21 first end, resistance
RS21 first end and electric capacity C21 first end connection, inductance L21 the second end and resistance RS21 the second end, electric capacity
The positive pole connection output drive signal of C21 first end, piezo-resistance VD11 first end and diode DS21；Diode
DS21 negative pole is connected with resistance RS23 first end, electric capacity C23 first end, and resistance RS23 the second end is with resistance RS24's
First end connects；Second output end of the rectification circuit 2 and electric capacity C21 the second end, electric capacity C22 the second end, pressure-sensitive electricity
Resistance VD11 the second end, resistance RS24 the second end and electric capacity C23 the second end connects and is grounded.
The low-voltage protection circuit 4, including voltage-stabiliser tube ZS61-ZS63, diode DS61, resistance R61-R65, electric capacity
C61, electric capacity CS62, inductance L41B and triode QS61- QS62；Inductance L41B is the inductance with magnetic core；The drive signal
It is connected with the negative pole of the voltage-stabiliser tube ZS62, voltage-stabiliser tube ZS62 positive pole passes through resistance RS63 and voltage-stabiliser tube ZS63 negative pole, electricity
Hold CS62 first end, resistance RS64 first end and resistance RS65 first end connection, resistance RS65 the second end and three
Pole pipe QS62 base stage connection, triode QS62 emitter stage and voltage-stabiliser tube ZS61 negative pole, resistance RS62 first end and
Triode QS61 base stage connection, triode QS61 emitter stage output control signal, triode QS61 colelctor electrode and resistance
RS62 the second end, the negative electrode connection of electric capacity C61 first end, electric capacity CS61 first end and diode DS61, diode
DS61 anode is connected with resistance RS61 first end, and resistance RS61 the second end is connected with inductance L41B first end, voltage stabilizing
Pipe ZS63 positive pole, electric capacity CS62 the second end, resistance RS64 the second end, triode QS62 colelctor electrode, voltage-stabiliser tube ZS61
Positive pole, electric capacity C61 the second end, electric capacity CS61 the second end and inductance L41B the second end connect and be grounded.
The drive circuit 5, including resistance RS31-RS33, resistance RS35A, resistance RS35B, voltage control chip US31,
Electric capacity CS41, electric capacity C62, inductance LS41, metal-oxide-semiconductor Q41 and diode DS32；The voltage control chip US31 for type
Number be BP3319MB chip；6 ends of the drive signal after electric resistance partial pressure with voltage control chip US31, the low pressure
The control signal of protection circuit 4 and electric capacity C62 first end connection, electric capacity C62 the second end and 8 ends of voltage control chip
Connect and be grounded；Voltage control chip US31 common port is connected to ground by electric capacity；Voltage control chip US31 5 ends and electricity
RS31 first end, the connection of resistance RS32 first end is hindered, resistance RS32 the second end is connected with diode DS32 negative pole, and two
Pole pipe DS32 positive pole is connected with resistance RS31 the second end, metal-oxide-semiconductor Q41 grid and by resistance RS33's and metal-oxide-semiconductor Q41
Source electrode, voltage control chip US31 3 ends connect and pass through resistance eutral grounding；Metal-oxide-semiconductor Q41 drain electrode is exported by inductance LS41
Voltage signal；Voltage control chip US31 2 ends are grounded by resistance RS35B；Voltage control chip US31 2 ends pass through resistance
RS35A is connected with the second end of the RS61；Voltage control chip US31 6 ends are by electric capacity with voltage control chip US31's
8 ends connect and are grounded.
The transforming circuit 6, including inductance L41A, diode D41, electric capacity C43A, electric capacity C43B, resistance RS46 and altogether
Mould inductance L13；Inductance L41A is the inductance with magnetic core；
The first end of the inductance L41A and the drive signal, electric capacity C43A first end, electric capacity C43B first end,
The first end connection of resistance RS46 first end and common mode inductance L13 first coils；Inductance L41A the second end and the electricity
Press the connection of signal and diode D41 positive pole；Diode D41 negative pole and electric capacity C43A the second end, the of electric capacity C43B
The first end at two ends, resistance RS46 the second end and the coils of common mode inductance L13 second is connected and is grounded；Common mode inductance L13
The positive pole of the second end output direct current of one coil, the negative pole of the second end output direct current of the coils of common mode inductance L13 second.
The course of work of the present utility model is as follows：After power supply is opened, AC alternating voltages are through F11 fuses, common mode inductance
After L11, L12 differential mode capacitor C11 form rectifier bridge rectification by DS11 DS12 DS13 DS14, the direct current of positive envelope is formed
Voltage, and control chip US31 power pins VDD is quickly charged to by startup operating voltage by RS61A, RS61B, RS61C
Point, control chip US31 start to detect and worked.Chip alternately opens cut-off work by RS31 driving switch pipes Q41.Inductance
Primary L41A energy storage, and electric energy is delivered to output by logical D41 releases.High-frequency ac voltage is whole through exporting fast recovery diode D41
Output electrolysis C43A C43B chargings are given after stream, because output electrolyte capacity is very big, steady dc voltage is formed, is supplied to load
Electricity, complete the whole process that AC turns DC.
During operation, on outputting inductance secondary L41B both ends high-frequency ac voltage through DS61 rectifying tubes, C61 electrolysis,
ZS61 voltage-stabiliser tubes produce US31 operating voltages Vcc with QS31 triodes, with C62 electric capacity.Make voltage-stabiliser tube when input voltage is reduced to
When ZS63 is not turned on, triode QS62 base voltage will hold in the mouth position US31 Vcc voltages.Now US31 Vcc voltages are not aided in
Winding L41B controls are determined that US31 will not when Vbus voltages continue to be reduced to US31 input low pressure thresholds by Vbus completely
Work；Simultaneously because RS61A RS61B RS61C charging effect enters hiccup pattern.If Vbus continue drop US31 can because
Vcc is under-voltage and closes output.Driver does not work completely.When Vbus voltage recovery normal working voltages, Vcc will come back to
Normal value, driver are reworked.The magnitude of voltage of low-voltage variation can be worth to by adjusting ZS62 RS63 RS64.So that
Obtain driver to be operated in the input voltage range of requirement, avoid because input current is big, efficiency is low and sends out when inputting low pressure
Raw loss is serious, causes to drive overheating failure or even produces fire incident.
Embodiment described above is a kind of preferable scheme of the present utility model, not makees any shape to the utility model
Limitation in formula, there are other variants and remodeling on the premise of without departing from the technical scheme described in claim.
Claims (6)
1. a kind of ac-dc converter circuit, it is characterised in that including the first filter circuit, rectification circuit, the second filter circuit, low
Voltage protection circuit, drive circuit and transforming circuit；The input connection of first filter circuit and rectification circuit, rectified current
The output end on road is connected output drive signal with the second filter circuit, and the drive signal connects with low-voltage protection circuit power end
Connect, low-voltage protection circuit output end is connected with drive circuit, and drive circuit exports steady dc voltage by transforming circuit；Institute
State the first filter circuit, including fuse F11, common mode inductance L11, common mode inductance L12 and electric capacity C11；Live wire is exchanged with melting
Disconnected device F11 first end connection, fuse F11 the second end are connected with the first end of common mode inductance L11 first coils, common mode electricity
Second end of sense L11 first coils is connected with the first end of common mode inductance L12 first coils, common mode inductance L12 first coils
Second end is connected with electric capacity C11 first end, the first input end of rectification circuit；Exchange the zero line lines of mould inductance L11 second together
The first end connection of circle, the second end of the coils of common mode inductance L11 second are connected with the second end of common mode inductance L12 first coils,
Second end of the coils of common mode inductance L12 second is connected with the second input of electric capacity C11 the second end, rectification circuit.
A kind of 2. ac-dc converter circuit according to claim 1, it is characterised in that second filter circuit, including
Inductance L21, resistance RS21, resistance RS23, resistance RS24, electric capacity C21-C23, diode DS21 and piezo-resistance VD11；Institute
The first end for stating the first output end of rectification circuit and inductance L21 first end, resistance RS21 first end and electric capacity C21 connects
Connect, inductance L21 the second end and resistance RS21 the second end, electric capacity C21 first end, piezo-resistance VD11 first end with
And diode DS21 positive pole connection output drive signal；Diode DS21 negative pole and resistance RS23 first end, electric capacity C23
First end connection, resistance RS23 the second end is connected with resistance RS24 first end；Second output end of the rectification circuit
Second end at second end at the second end, electric capacity C22, piezo-resistance VD11 the second end, resistance RS24 with electric capacity C21 and electricity
The second end for holding C23 connects and is grounded.
A kind of 3. ac-dc converter circuit according to claim 2, it is characterised in that the low-voltage protection circuit, including
Voltage-regulator diode ZS61-ZS63, diode DS61, resistance R61-R65, electric capacity C61, electric capacity CS62, inductance L41B and three poles
Pipe QS61- QS62；The drive signal is connected with the negative pole of the voltage-regulator diode ZS62, voltage-regulator diode ZS62 positive pole
Pass through resistance RS63 and voltage-regulator diode ZS63 negative pole, electric capacity CS62 first end, resistance RS64 first end and resistance
RS65 first end connection, resistance RS65 the second end is connected with triode QS62 base stage, triode QS62 emitter stage and
The base stage connection of voltage-regulator diode ZS61 negative pole, resistance RS62 first end and triode QS61, triode QS61 hair
Emitter-base bandgap grading output control signal, triode QS61 colelctor electrode and resistance RS62 the second end, electric capacity C61 first end, electric capacity
CS61 first end and diode DS61 negative electrode connection, diode DS61 anode are connected with resistance RS61 first end,
Resistance RS61 the second end is connected with inductance L41B first end, voltage-regulator diode ZS63 positive pole, electric capacity CS62 the second end,
Resistance RS64 the second end, triode QS62 colelctor electrode, voltage-regulator diode ZS61 positive pole, electric capacity C61 the second end, electric capacity
CS61 the second end and inductance L41B the second end connect and are grounded.
4. a kind of ac-dc converter circuit according to claim 3, it is characterised in that the drive circuit, including resistance
RS31-RS33, resistance RS35A, resistance RS35B, voltage control chip US31, electric capacity CS41, electric capacity C62, inductance LS41, MOS
Pipe Q41 and diode DS32；
The chip for model BP3319MB of the voltage control chip US31；
Control of the drive signal after electric resistance partial pressure with voltage control chip US31 6 ends, the low-voltage protection circuit
Signal and electric capacity C62 first end connect, and electric capacity C62 the second end is connected and is grounded with 8 ends of voltage control chip；Voltage
Control chip US31 common port is connected to ground by electric capacity；Voltage control chip US31 5 ends and resistance RS31 first end,
Resistance RS32 first end connection, resistance RS32 the second end are connected with diode DS32 negative pole, diode DS32 positive pole
The grid at the second end, metal-oxide-semiconductor Q41 with resistance RS31 is connected and controlled by resistance RS33 and metal-oxide-semiconductor Q41 source electrode, voltage
Chip US31 3 ends connect and pass through resistance eutral grounding；Metal-oxide-semiconductor Q41 drain electrode passes through inductance LS41 output voltage signals；Voltage
Control chip US31 2 ends are grounded by resistance RS35B；Voltage control chip US31 2 ends by resistance RS35A with it is described
RS61 the second end connection；Voltage control chip US31 6 ends are connected and connect with voltage control chip US31 8 ends by electric capacity
Ground.
5. a kind of ac-dc converter circuit according to claim 4, it is characterised in that the transforming circuit, including inductance
L41A, diode D41, electric capacity C43A, electric capacity C43B, resistance RS46 and common mode inductance L13；
The first end of the inductance L41A and the drive signal, electric capacity C43A first end, electric capacity C43B first end, resistance
The first end connection of RS46 first end and common mode inductance L13 first coils；Believe with the voltage at inductance L41A the second end
Number and diode D41 positive pole connection；Diode D41 negative pole and electric capacity C43A the second end, electric capacity C43B the second end,
Resistance RS46 the second end and the first end of the coils of common mode inductance L13 second are connected and are grounded；Common mode inductance L13 first coils
The second end output direct current positive pole, the coils of common mode inductance L13 second the second end output direct current negative pole.
6. a kind of ac-dc converter circuit according to claim 5, it is characterised in that the inductance L41A, inductance L41B
It is the inductance with magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720873513.2U CN207184347U (en) | 2017-07-18 | 2017-07-18 | A kind of ac-dc converter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720873513.2U CN207184347U (en) | 2017-07-18 | 2017-07-18 | A kind of ac-dc converter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207184347U true CN207184347U (en) | 2018-04-03 |
Family
ID=61736044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720873513.2U Expired - Fee Related CN207184347U (en) | 2017-07-18 | 2017-07-18 | A kind of ac-dc converter circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425741A (en) * | 2017-07-18 | 2017-12-01 | 浙江凯耀照明股份有限公司 | A kind of ac-dc converter circuit with low-voltage variation |
-
2017
- 2017-07-18 CN CN201720873513.2U patent/CN207184347U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425741A (en) * | 2017-07-18 | 2017-12-01 | 浙江凯耀照明股份有限公司 | A kind of ac-dc converter circuit with low-voltage variation |
| CN107425741B (en) * | 2017-07-18 | 2020-06-26 | 浙江凯耀照明股份有限公司 | AC-DC conversion circuit with low-voltage protection |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180403 |
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| CF01 | Termination of patent right due to non-payment of annual fee |