CN106568998A - Bidirectional current sampling circuit - Google Patents
Bidirectional current sampling circuit Download PDFInfo
- Publication number
- CN106568998A CN106568998A CN201610993488.1A CN201610993488A CN106568998A CN 106568998 A CN106568998 A CN 106568998A CN 201610993488 A CN201610993488 A CN 201610993488A CN 106568998 A CN106568998 A CN 106568998A
- Authority
- CN
- China
- Prior art keywords
- diode
- secondary winding
- sampling
- voltage stabilizing
- anode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 87
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 19
- 238000004804 winding Methods 0.000 claims abstract description 85
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 52
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000005284 excitation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electronic Switches (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention provides a bidirectional current sampling circuit, which comprises a current transformer, a first voltage stabilizing diode, a second voltage stabilizing diode, a reset resistor, a sampling switch tube, a sampling resistor and a first to a fourth diode, wherein the current transformer comprises a primary winding and a secondary winding; the first diode and the second diode are serially connected to form a first branch; the third diode and the fourth diode are serially connected to form a second branch; the sampling switch tube and the sampling resistor are serially connected to form a third branch; the above three branches are in parallel connection; the middle serial connection point of the first branch and the second branch is respectively connected with the first end and the second end of the secondary winding correspondingly; one parallel connection point of the three branches is connected with the anodes of the first voltage stabilizing diode and the second voltage stabilizing diode; the cathode of the second voltage stabilizing diode is connected with the first end of the secondary winding; and the cathode of the first voltage stabilizing diode is serially connected with the reset resistor and is then connected with the first end of the secondary winding. Thus, the bidirectional current sampling circuit is applicable to different application scenes, type selection is flexible, voltage stabilizing diodes with two cathodes in top-to-top serial connection in the prior art are replaced for realizing current transformer reset and voltage clamping.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a bidirectional current sampling circuit.
Background
The totem pole bridgeless PFC (Power Factor Correction) is a high-efficiency AC/DC converter topology, and the application difficulty of the topology is that bidirectional current sampling is required and isolation of a control ground is required. The scheme that can satisfy this kind of requirement at present has isolation fortune to put sampling, hall element sampling, current transformer sampling etc. but isolation fortune is put sampling and hall element sampling and has the slower shortcoming of sampling rate, can't satisfy the quick overcurrent protection of PFC and logic control's requirement, and current transformer sampling rate is faster, but current transformer needs the circuit that resets under the general condition, is the current sampling of unilateral simultaneously.
As shown in fig. 1, in order to solve the above problem, an invention patent named as a current sampling device with application number 201210004682.4 is disclosed in the prior art, and the invention patent realizes positive and negative current sampling of the primary side of a current transformer T through four diodes d 1-d 4, a sampling switch tube S and a sampling resistor R. The invention realizes the reset and voltage clamping of the current transformer T by the voltage stabilizing diodes d 5-d 6 which are connected in parallel with two cathodes of a secondary side winding of the current transformer T in series in an opposite mode, but the invention is applied to different power grades and working duty ratios, has different requirements on the types of the voltage stabilizing diodes d 5-d 6 and the sampling switch tube S, particularly needs to select the voltage stabilizing diode with larger voltage stabilizing value Vz and the sampling switch tube with larger drain source voltage Vds under the application conditions of high power and high duty ratio, therefore, the types of the voltage stabilizing diodes d 5-d 6 are complicated, and the reset of the current transformer T is realized by the voltage stabilizing value Vz of the voltage stabilizing diodes d 5-d 6, but the voltage stabilizing value Vz of the voltage stabilizing diodes d 5-d 6 is influenced along with the change of working current and temperature, therefore, the voltage stabilizing diodes d 5-d 6 are in a conducting state each time of the reset of the current transformer T, resulting in a large dissipated power.
Therefore, a bidirectional current sampling circuit is needed, which is suitable for different application scenarios, is flexible in type selection, and replaces the two voltage stabilizing diodes connected in series with the cathodes in opposite vertex to realize current transformer reset and voltage clamping.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a bidirectional current sampling circuit, which is suitable for different application scenes, is flexible in type selection, and replaces two voltage-stabilizing diodes with cathodes connected in series in opposite tops in the prior art to realize current transformer reset and voltage clamping.
In order to solve the above technical problem, an embodiment of the present invention provides a bidirectional current sampling circuit, where the bidirectional current sampling circuit includes a current transformer, a first voltage regulator diode, a second voltage regulator diode, a reset resistor, a sampling switch tube, a sampling resistor, a first diode, a second diode, a third diode, and a fourth diode; wherein,
the current transformer comprises a primary winding and a secondary winding; the primary winding is connected with an external circuit to be sampled; the secondary winding comprises a first end and a second end which are oppositely arranged;
the first diode and the second diode are connected in series to form a first branch circuit, the third diode and the fourth diode are connected in series to form a second branch circuit, the sampling switch tube and the sampling resistor are connected in series to form a third branch circuit, and the first branch circuit, the second branch circuit and the third branch circuit which are formed in series are all connected in parallel; the serial connection point between the anode of the first diode and the cathode of the second diode is connected with the first end of the secondary winding; a series connection point between the anode of the third diode and the cathode of the fourth diode is connected with the second end of the secondary winding; the junction between the anode of the second diode and the anode of the fourth diode is connected with the anode of the first voltage stabilizing diode and the anode of the second voltage stabilizing diode;
the cathode of the second voltage-stabilizing diode is connected with the first end of the secondary winding;
the cathode of the first voltage stabilizing diode is connected with one end of the reset resistor and the second end of the secondary winding;
and the other end of the reset resistor is connected with the first end of the secondary winding.
The voltage stabilizing values of the first voltage stabilizing diode and the second voltage stabilizing diode are both smaller than the rated voltage of the sampling switch tube.
The embodiment of the invention also provides a bidirectional current sampling circuit, which comprises a current transformer, a first voltage stabilizing diode, a second voltage stabilizing diode, a reset resistor, a sampling switch tube, a sampling resistor, a first diode and a second diode; wherein,
the current transformer comprises a primary winding, a first secondary winding and a second secondary winding which are connected in series; the primary winding is connected with an external circuit to be sampled; the first secondary winding comprises a first end and a second end which are oppositely arranged, the second secondary winding comprises a first end and a second end which are oppositely arranged, and the second end of the first secondary winding and the first end of the second secondary winding are connected on the same serial connection end;
the first diode, the sampling switch tube, the sampling resistor and the first secondary winding are connected in series to form a first loop, and the first diode, the second diode, the first secondary winding and the second secondary winding are also connected in series to form a second loop; the anode of the first diode is connected with the first end of the first secondary winding, and the cathode of the first diode is connected with the cathode of the second diode; the anode of the second diode is connected with the second end of the second secondary winding;
the anode of the first voltage stabilizing diode is connected with the serial end and the anode of the second voltage stabilizing diode, and the cathode of the first voltage stabilizing diode is connected with the first end of the first secondary winding;
the cathode of the second voltage stabilizing diode is connected with the second end of the second secondary winding;
and one end of the reset resistor is connected with the first end of the first secondary winding, and the other end of the reset resistor is connected with the second end of the second secondary winding.
The voltage stabilizing values of the first voltage stabilizing diode and the second voltage stabilizing diode are both smaller than the rated voltage of the sampling switch tube.
The embodiment of the invention has the following beneficial effects:
according to the invention, the magnetic reset of the current transformer is realized by adopting the reset resistor, and the voltage clamping of the current transformer is realized by respectively connecting the first voltage stabilizing diode and the second voltage stabilizing diode at two ends of the reset resistor, so that the voltage spike during reset is prevented from exceeding the capacity limit of the sampling switch tube, thereby replacing the situation that the reset and the voltage clamping of the current transformer are realized by adopting two voltage stabilizing diodes with cathodes connected in series in a butting mode in the prior art, avoiding the problem that the loss power of the voltage stabilizing diodes is overlarge during the reset of the current transformer, improving the reliability of the circuit, and the voltage stabilizing diodes, the sampling switch tube and the reset resistor in the invention are flexible in type selection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
FIG. 1 is a schematic circuit diagram of a prior art bi-directional current sampling apparatus;
fig. 2 is a schematic circuit connection diagram of a bidirectional current sampling circuit according to an embodiment of the present invention;
fig. 3 is a circuit connection schematic diagram of a bidirectional current sampling circuit according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 2, a bidirectional current sampling circuit according to a first embodiment of the present invention is provided, which includes a current transformer M, a first zener diode DZ1, a second zener diode DZ2, a reset resistor Rt, a sampling switch tube S0, a sampling resistor Rs, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; wherein,
the current transformer M comprises a primary winding L0 and a secondary winding L1; the primary winding L0 is connected with an external circuit to be sampled; the secondary winding L1 includes a first end a and a second end b oppositely disposed;
the first diode D1 and the second diode D2 are connected in series to form a first branch circuit, the third diode D3 and the fourth diode D4 are connected in series to form a second branch circuit, the sampling switch tube S0 and the sampling resistor Rs are connected in series to form a third branch circuit, and the first branch circuit, the second branch circuit and the third branch circuit which are formed in series are all connected in parallel; a series connection point between the anode of the first diode D1 and the cathode of the second diode D2 is connected with the first end a of the secondary winding L1; a series connection point between the anode of the third diode D3 and the cathode of the fourth diode D4 is connected with the second end b of the secondary winding L1; the junction point between the anode of the second diode D2 and the anode of the fourth diode D4 is connected to both the anode of the first zener diode DZ1 and the anode of the second zener diode DZ 2;
the cathode of the second voltage-stabilizing diode DZ2 is connected with the first end a of the secondary winding L1;
the cathode of the first voltage-stabilizing diode DZ1 is connected with one end of the reset resistor Rt and the second end b of the secondary winding L1;
the other end of the reset resistor Rt is connected to a first end a of the secondary winding L1.
It should be noted that the regulated voltage values of the first zener diode DZ1 and the second zener diode DZ2 are both smaller than the rated voltage of the sampling switch tube S0.
In the first embodiment of the present invention, the excitation current (the current flowing through the secondary winding) of the current transformer M is reset to 0 through the reset resistor Rt in one switching cycle of the sampling switching tube S0, and the specific process is as follows: when the sampling switch tube S0 is turned on, the excitation current of the current transformer M rises, and after the sampling switch tube S0 is turned off, the excitation current of the current transformer M needs a follow current path, and the excitation current realizes that the follow current linearly falls to 0 within the switching period of the sampling switch tube S0 through the reset resistor Rt with a certain resistance value.
Because the two ends of the reset resistor Rt are respectively connected with the first voltage stabilizing diode DZ1 and the second voltage stabilizing diode DZ2, when it is detected that the exciting current flowing through the current transformer M is positive, the voltage of the reset resistor Rt is negative, and the value of the voltage is the product of the reset current Ires and the reset resistor Rt, namely Ires R, when the exciting current is very large, Ires R may exceed the rated working voltage of the sampling switch tube S0, which causes the avalanche breakdown of the sampling switch tube S0, and at this time, the first voltage stabilizing diode ZD1 with the voltage stabilizing value Vz smaller than the rated working voltage of the sampling switch tube S0 is selected, so that the voltage of the current transformer M is clamped on Vz, and the sampling switch tube S0 is protected; similarly, when detecting that the exciting current flowing through the current transformer M is negative, the second zener diode ZD2 with the zener voltage value Vz smaller than the rated operating voltage of the sampling switch tube S0 is selected, so that the voltage of the current transformer M is clamped on Vz, and the sampling switch tube S0 is protected.
Therefore, in the first embodiment of the present invention, the first zener diode DZ1, the second zener diode DZ2, and the reset resistor Rt replace the prior art that two zener diodes with cathodes connected in series to each other are used to implement the reset and voltage clamping of the current transformer M, so that the problem of excessive power loss of the first zener diode DZ1 and the second zener diode DZ2 during the reset of the current transformer M is avoided, the reliability of the circuit is improved, and the first zener diode DZ1, the second zener diode DZ2, the reset resistor Rt, and the sampling switch tube S0 are flexible in type selection.
As shown in fig. 3, with respect to the bidirectional current sampling circuit in the first embodiment of the present invention, the second embodiment of the present invention further provides another bidirectional current sampling circuit, which includes a current transformer M, a first zener diode DZ1, a second zener diode DZ2, a reset resistor Rt, a sampling switch tube S0, a sampling resistor Rs, a first diode D1, and a second diode D2; wherein,
the current transformer M comprises a primary winding L0, and a first secondary winding L11 and a second secondary winding L12 which are connected in series; the primary winding L0 is connected with an external circuit to be sampled; the first secondary winding L11 includes a first end a and a second end which are oppositely arranged, the second secondary winding L12 includes a first end b and a second end b which are oppositely arranged, and the second end of the first secondary winding L11 and the first end of the second secondary winding L12 are connected at the same serial end c;
the first diode D1, the sampling switch tube S0, the sampling resistor Rs and the first secondary winding L11 are connected in series to form a first loop, and the first diode D1, the second diode D2, the first secondary winding L11 and the second secondary winding L12 are connected in series to form a second loop; wherein, the anode of the first diode D1 is connected with the first end a of the first secondary winding L11, and the cathode is connected with the cathode of the second diode D2; the anode of the second diode D2 is connected with the second end b of the second secondary winding L12;
the anode of the first voltage-stabilizing diode DZ1 is connected with the series end c and the anode of the second voltage-stabilizing diode DZ2, and the cathode is connected with the first end a of the first secondary winding L11;
the cathode of the second voltage stabilizing diode DZ2 is connected with the second end b of the second secondary winding L12;
the reset resistor Rt has one end connected to the first end a of the first secondary winding L11 and the other end connected to the second end b of the second secondary winding L12.
It should be noted that the regulated voltage values of the first zener diode DZ1 and the second zener diode DZ2 are both smaller than the rated voltage of the sampling switch tube S0.
The two-way current sampling circuit in the second embodiment of the present invention and the two-way current sampling circuit in the first embodiment of the present invention have the same working principle in implementing reset and voltage clamping of the current transformer, and therefore, the description thereof is omitted.
The embodiment of the invention has the following beneficial effects:
according to the invention, the magnetic reset of the current transformer is realized by adopting the reset resistor, and the voltage clamping of the current transformer is realized by respectively connecting the first voltage stabilizing diode and the second voltage stabilizing diode at two ends of the reset resistor, so that the voltage spike during reset is prevented from exceeding the capacity limit of the sampling switch tube, thereby replacing the situation that the reset and the voltage clamping of the current transformer are realized by adopting two voltage stabilizing diodes with cathodes connected in series in a butting mode in the prior art, avoiding the problem that the loss power of the voltage stabilizing diodes is overlarge during the reset of the current transformer, improving the reliability of the circuit, and the voltage stabilizing diodes, the sampling switch tube and the reset resistor in the invention are flexible in type selection.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (4)
1. A bidirectional current sampling circuit is characterized by comprising a current transformer (M), a first voltage stabilizing diode (DZ 1), a second voltage stabilizing diode (DZ 2), a reset resistor (Rt), a sampling switch tube (S0), a sampling resistor (Rs), a first diode (D1), a second diode (D2), a third diode (D3) and a fourth diode (D4); wherein,
the current transformer (M) comprises a primary winding (L0) and a secondary winding (L1); the primary winding (L0) is connected with an external circuit to be sampled; the secondary winding (L1) comprises a first end (a) and a second end (b) which are oppositely arranged;
the first diode (D1) and the second diode (D2) are connected in series to form a first branch, the third diode (D3) and the fourth diode (D4) are connected in series to form a second branch, the sampling switch tube (S0) and the sampling resistor (Rs) are connected in series to form a third branch, and the first branch, the second branch and the third branch formed by the series connection are all connected in parallel; wherein a serial connection point between the anode of the first diode (D1) and the cathode of the second diode (D2) is connected with the first end (a) of the secondary winding (L1); a series connection point between the anode of the third diode (D3) and the cathode of the fourth diode (D4) is connected with the second end (b) of the secondary winding (L1); the junction between the anode of the second diode (D2) and the anode of the fourth diode (D4) is connected with both the anode of the first zener diode (DZ 1) and the anode of the second zener diode (DZ 2);
the cathode of the second zener diode (DZ 2) is connected to the first end (a) of the secondary winding (L1);
the cathode of the first voltage-stabilizing diode (DZ 1) is connected with one end of the reset resistor (Rt) and the second end (b) of the secondary winding (L1);
the other end of the reset resistor (Rt) is connected to the first end (a) of the secondary winding (L1).
2. The bi-directional current sampling circuit of claim 1, wherein the regulated voltage values of the first zener diode (DZ 1) and the second zener diode (DZ 2) are each less than the voltage rating of the sampling switching tube (S0).
3. A bidirectional current sampling circuit is characterized in that the bidirectional current sampling circuit comprises a current transformer (M), a first voltage stabilizing diode (DZ 1), a second voltage stabilizing diode (DZ 2), a reset resistor (Rt), a sampling switch tube (S0), a sampling resistor (Rs), a first diode (D1) and a second diode (D2); wherein,
the current transformer (M) comprises a primary winding (L0), and a first secondary winding (L11) and a second secondary winding (L12) which are connected in series; the primary winding (L0) is connected with an external circuit to be sampled; the first secondary winding (L11) comprises a first end (a) and a second end which are oppositely arranged, the second secondary winding (L12) comprises a first end and a second end (b) which are oppositely arranged, and the second end of the first secondary winding (L11) and the first end of the second secondary winding (L12) are connected on the same serial end (c);
the first diode (D1) is connected in series with the sampling switching tube (S0), the sampling resistor (Rs) and the first secondary winding (L11) to form a first loop, and the first diode (D1) is also connected in series with the second diode (D2), the first secondary winding (L11) and the second secondary winding (L12) to form a second loop; wherein the first diode (D1) has an anode connected to the first end (a) of the first secondary winding (L11) and a cathode connected to the cathode of the second diode (D2); the second diode (D2) anode is connected to the second end (b) of the second secondary winding (L12);
the anode of the first zener diode (DZ 1) is connected to the series terminal (c) and the anode of the second zener diode (DZ 2), and the cathode is connected to the first terminal (a) of the first secondary winding (L11);
the second zener diode (DZ 2) cathode is connected to the second end (b) of the second secondary winding (L12);
one end of the reset resistor (Rt) is connected to the first end (a) of the first secondary winding (L11), and the other end is connected to the second end (b) of the second secondary winding (L12).
4. The bi-directional current sampling circuit according to claim 3, wherein the regulated voltage values of the first zener diode (DZ 1) and the second zener diode (DZ 2) are both less than the voltage rating of the sampling switching tube (S0).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610993488.1A CN106568998B (en) | 2016-11-11 | 2016-11-11 | A kind of bidirectional current sample circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610993488.1A CN106568998B (en) | 2016-11-11 | 2016-11-11 | A kind of bidirectional current sample circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106568998A true CN106568998A (en) | 2017-04-19 |
| CN106568998B CN106568998B (en) | 2019-11-08 |
Family
ID=58541418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610993488.1A Active CN106568998B (en) | 2016-11-11 | 2016-11-11 | A kind of bidirectional current sample circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106568998B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640565A (en) * | 2021-07-26 | 2021-11-12 | 台达电子企业管理（上海）有限公司 | Current detection circuit, current detection method and converter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1514253A (en) * | 2003-08-15 | 2004-07-21 | 艾默生网络能源有限公司 | Current mutual induction sampliing circuit and its resetting method |
| CN101707441A (en) * | 2009-11-26 | 2010-05-12 | 华为技术有限公司 | Totem-pole bridgeless circuit system and current sampling device |
| CN101958550A (en) * | 2009-07-17 | 2011-01-26 | 台达电子工业股份有限公司 | Bridge-free power factor correction circuit system with current detection circuit and method thereof |
| CN102520232A (en) * | 2009-11-26 | 2012-06-27 | 华为技术有限公司 | Current sampling device |
| CN103809007A (en) * | 2012-11-13 | 2014-05-21 | 中兴通讯股份有限公司 | Device and method for inductive current sampling of bridge-free PFC circuit |
| CN105634295A (en) * | 2016-01-27 | 2016-06-01 | 深圳慧能泰半导体科技有限公司 | Current sampling circuit and current sampling system for totem-pole bridgeless circuit |
-
2016
- 2016-11-11 CN CN201610993488.1A patent/CN106568998B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1514253A (en) * | 2003-08-15 | 2004-07-21 | 艾默生网络能源有限公司 | Current mutual induction sampliing circuit and its resetting method |
| CN101958550A (en) * | 2009-07-17 | 2011-01-26 | 台达电子工业股份有限公司 | Bridge-free power factor correction circuit system with current detection circuit and method thereof |
| CN101707441A (en) * | 2009-11-26 | 2010-05-12 | 华为技术有限公司 | Totem-pole bridgeless circuit system and current sampling device |
| CN102520232A (en) * | 2009-11-26 | 2012-06-27 | 华为技术有限公司 | Current sampling device |
| CN103809007A (en) * | 2012-11-13 | 2014-05-21 | 中兴通讯股份有限公司 | Device and method for inductive current sampling of bridge-free PFC circuit |
| CN105634295A (en) * | 2016-01-27 | 2016-06-01 | 深圳慧能泰半导体科技有限公司 | Current sampling circuit and current sampling system for totem-pole bridgeless circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640565A (en) * | 2021-07-26 | 2021-11-12 | 台达电子企业管理（上海）有限公司 | Current detection circuit, current detection method and converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106568998B (en) | 2019-11-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103152912B (en) | Modified high-efficiency light-emitting diode (LED) drive circuit and drive method | |
| CN104836419B (en) | Switching Power Supply driving chip power supply circuit with under-voltage detection function | |
| US9072126B2 (en) | Open-circuit protection circuit of constant current driving circuit for light emitting diodes | |
| CN107370142A (en) | A kind of power taking control circuit, intelligent control switch and intelligent illuminating system | |
| CN104427721B (en) | Led drive circuit | |
| CN108092237A (en) | A kind of full-bridge inverting power switch pipe overcurrent and load over-current protection circuit | |
| CN104811049A (en) | Resonance circuit | |
| CN103457472A (en) | Switching power supply and lamp applying same | |
| CN105591542B (en) | A kind of Buck converters and its reflux control circuit | |
| CN106568998B (en) | A kind of bidirectional current sample circuit | |
| CN104057181A (en) | Open-phase protection circuit for inverter welding machine | |
| CN206341456U (en) | LED drive power and system | |
| CN108923662A (en) | A kind of push-pull converter circuit and its control method | |
| CN201700036U (en) | Protection circuit for open circuit | |
| CN101867309A (en) | Univoltage switch status conversion circuit | |
| CN103200735A (en) | Light-emitting diode (LED) actuator preventing LED from flickering | |
| CN209805697U (en) | Single live wire power supply circuit | |
| CN203167355U (en) | LED driver preventing LED from flickering | |
| CN201742312U (en) | Single-voltage switch state converting circuit | |
| CN102238785B (en) | Open circuit protection circuit | |
| CN207884278U (en) | A kind of full-bridge inverting power switch tube overcurrent and load over-current protection circuit | |
| CN204741590U (en) | LED drive circuit | |
| CN207022247U (en) | Multi-path flow equalizing output circuit in a kind of LED panel lamp | |
| CN205385314U (en) | Novel high frequency charging source device | |
| CN212275946U (en) | External adjustable inductance demagnetization detection and power detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |