CN102636676A - Bridge-type current detecting circuit - Google Patents
Bridge-type current detecting circuit Download PDFInfo
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- CN102636676A CN102636676A CN2011100370908A CN201110037090A CN102636676A CN 102636676 A CN102636676 A CN 102636676A CN 2011100370908 A CN2011100370908 A CN 2011100370908A CN 201110037090 A CN201110037090 A CN 201110037090A CN 102636676 A CN102636676 A CN 102636676A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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Abstract
The invention discloses a bridge-type current detecting circuit. The bridge-type current detecting circuit comprises a current transformer, a current detecting resistor (Rs), a first controllable switch (S1), a second controllable switch (S2), a third controllable switch (S3) and a fourth controllable switch (S4). The current detecting circuit provided by the invention can be used for eliminating the hidden danger that the power source is burned since a big reversely irrigated current falsely triggers a circle-by-circle current limiting protection action of a control chip, so as to improve the reliability of the power source.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of bridge-type current detection circuit.
Background technology
Fig. 1 is the synoptic diagram that adds the topological structure of secondary synchronous rectification according to the full-bridge of correlation technique, and is as shown in Figure 1, and current transformer (CURRENT TRANSFORMER abbreviates CT as) primary current equals full-bridge transformer primary current.
Switching tube Q1, Q4 conducting, the CT primary current flows to CSB from CSA, and this moment, the energy of power supply passed to secondary from the former limit of transformer, and the entire circuit energy is to send from the input power supply, and the electric current that current detection circuit detects is a forward current; And switching tube Q1, Q4 conducting, the CT primary current flows to CSA from CSB, and the circuit topology energy recharges toward input power supply place, and the electric current that this moment, current detection circuit detected is the anti-electric current of irritating.In like manner, switching tube Q2, Q3 conducting, the CT primary current flows to CSA from CSB, and the electric current that current detection circuit detects is a forward current; Otherwise switching tube Q2, Q3 conducting, the CT primary current flows to CSB from CSA, and the electric current that current detection circuit detects is the anti-electric current of irritating.Anti-filling electric current is to be poured into former limit owing to secondary energy under the various situation is counter to produce.
Fig. 2 is the synoptic diagram according to the bridge-type current detection circuit of correlation technique, and is as shown in Figure 2, and the CT primary current is when CSA flows to CSB, and according to end relation of the same name, CT secondary induction current, is returned from D4 again through Rs earlier through D1 at last, forms loop.On Rs, form voltage, thereby can draw the secondary current size of CT,, obtain CT primary current size, just full-bridge main-transformer size of current according to the former secondary turn ratio relation of CT through Ohm law; And the CT primary current is when CSB flows to CSA, and CT secondary induction current again through Rs, returns to form loop from D2 earlier through D3 at last.On Rs, form voltage, thereby can obtain CT primary current size this moment, just full-bridge main-transformer size of current.
No matter how conducting of Q1, Q2, Q3, Q4, the electric current in the full-bridge main circuit is forward current or the anti-electric current of irritating, as long as there is electric current to flow through the former limit of CT winding, will on Rs, form corresponding proportional forward voltage.
Fig. 3 is according to the current mode full-bridge of correlation technique and the integrally-built synoptic diagram of synchronous rectification; As shown in Figure 3; D1, D2, D3, D4 function are exactly a full-wave rectification, through Rs the positive and negative AC signal on the CT are rectified into corresponding positive voltage signal, and this voltage signal is input to the current detecting pin (CURRENTSENSE of current-mode control chip after R2, C2 filtering; Abbreviate CS as); The current-mode control chip is according to the dutycycle size of CS pin level adjustment pulse-length modulation (PULSE WIDTHMODULATION abbreviates PWM as) signal, and the PWM ripple is like OUTA, the OUTB in 3 among the figure.
Fig. 4 is the synoptic diagram according to the current detection signal of the detection acquisition of correlation technique; As shown in Figure 4; For adopt on the Rs resistance the CT current waveform of one-period (full-bridge two groups open half period to managing each), wherein the waveform of every half period is divided into stage 1 and stage 2 (in Fig. 4, identifying with 1 and 2 respectively) again.Through analyzing the voltage waveform that to know stage 1 being anti-filling current commutates of correspondence among Fig. 4 and get.When secondary is big anti-when irritating the function of current to former limit, this current detection circuit will instead be irritated current detecting and become corresponding proportional forward voltage this moment.
But the anti-electric current of irritating is big more, and then corresponding forward voltage is big more, and the CS signal voltage is big more.When the CS signal surpasses the inner wave limiting protective valve of control chip threshold voltage,, thereby cause that power module burns with false triggering control chip wave limiting protection action.
Summary of the invention
To instead irritate current detecting to current sense resistor Rs in the correlation technique and become the problem of corresponding proportional forward voltage and propose the present invention, for this reason, fundamental purpose of the present invention is to provide a kind of bridge-type current detection circuit, to address the above problem.
To achieve these goals, according to an aspect of the present invention, a kind of bridge-type current detection circuit is provided.
Bridge-type current detection circuit according to the present invention comprises: current transformer; Wherein, The former limit windings in series of current transformer is in the full-bridge main circuit; One end of the secondary winding of current transformer is connected to an end of first gate-controlled switch and an end of second gate-controlled switch, and the other end of the secondary winding of current transformer is connected to an end of the 3rd gate-controlled switch and an end of the 4th gate-controlled switch; Current sense resistor; Wherein, One end of current sense resistor is connected to the other end of first gate-controlled switch and the other end of the 3rd gate-controlled switch, and the other end of current sense resistor is connected to the other end and the ground connection of the other end and the 4th gate-controlled switch of second gate-controlled switch, wherein first gate-controlled switch, second gate-controlled switch, the 3rd gate-controlled switch and the 4th gate-controlled switch; Be used under the effect of control signal, for the induction current of the secondary winding of current transformer provides path to current sense resistor.
Further, above-mentioned bridge-type current detection circuit also comprises: the benchmark power supply is used to current sense resistor a fixing forward dividing potential drop is provided; The biasing divider resistance, wherein, an end of biasing divider resistance is connected to the benchmark power supply, and the other end of biasing divider resistance is connected to an end of current sense resistor.
Further, above-mentioned bridge-type current detection circuit also comprises: filtering circuit is used for the electric current that current sense resistor detects is carried out filtering.
Further, filtering circuit comprises: resistance, and wherein, an end of resistance is connected to an end of current sense resistor, and the other end of resistance is exported filtered electric current; Electric capacity, wherein, an end of electric capacity is connected to the other end of resistance, the other end ground connection of electric capacity.
Further, above-mentioned bridge-type current detection circuit also comprises: diode, its negative pole is connected to the other end of resistance, plus earth.
Further, diode is the schottky diode that conduction voltage drop is lower than 0.3V.
Further, above-mentioned bridge-type current detection circuit also comprises: the MOS switching tube, its drain electrode is connected to the other end of resistance, its source ground.
Further, the MOS switching tube is used under the effect of control signal, with the conducting simultaneously of first gate-controlled switch, second gate-controlled switch, the 3rd gate-controlled switch and/or the 4th gate-controlled switch.
Further, the ON time of MOS switching tube is no more than 100ns.
Further, the MOS switching tube is a small-signal N-channel MOS pipe.
Through the present invention, under the control of four controllable switch S 1, S2, S3, S4, current sense resistor Rs will instead irritate current detecting and become corresponding proportional negative voltage.Because control chip wave limiting protection operating valve threshold voltage is a malleation; Therefore the anti-corresponding negative voltage of electric current of irritating is can not protect action by the flip chip wave limiting; Promptly can the hidden danger that big anti-filling electric current false triggering control chip wave limiting protects action to cause that power supply burns be eliminated through technical scheme of the present invention, thus the reliability of raising power supply.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the synoptic diagram that adds the topological structure of secondary synchronous rectification according to the full-bridge of correlation technique;
Fig. 2 is the synoptic diagram according to the bridge-type current detection circuit of correlation technique;
Fig. 3 is according to the current mode full-bridge of correlation technique and the integrally-built synoptic diagram of synchronous rectification;
Fig. 4 is the synoptic diagram according to the current detection signal of the detection acquisition of correlation technique;
Fig. 5 is the synoptic diagram according to the bridge-type current detection circuit of the embodiment of the invention;
Fig. 6 is according to controllable switch S 1, S2, S3, S4 in the electric current detecting structure of the embodiment of the invention, and switching tube VT is responsible for the driving sequential chart of Q1, Q2, Q3, Q4 with respect to full-bridge;
Fig. 7 is the synoptic diagram that detects the current detection signal that obtains according to the bridge-type current detection circuit of the embodiment of the invention;
Fig. 8 is the synoptic diagram of bridge-type current detection circuit according to the preferred embodiment of the invention;
Fig. 9 is the synoptic diagram that detects the current detection signal that obtains according to the bridge-type current detection circuit of the preferred embodiment of the present invention one;
Figure 10 is the synoptic diagram that detects the current detection signal that obtains according to the bridge-type current detection circuit of the preferred embodiment of the present invention two;
Figure 11 is the synoptic diagram that detects the current detection signal that obtains according to the bridge-type current detection circuit of the preferred embodiment of the present invention three.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the present invention.
The embodiment of the invention provides a kind of bridge-type current detection circuit.Fig. 5 is the synoptic diagram according to the bridge-type current detection circuit of the embodiment of the invention, and is as shown in Figure 5, comprises current transformer, current sense resistor Rs, first controllable switch S 1, second controllable switch S 2, the 3rd controllable switch S 3 and the 4th controllable switch S 4.Be described in detail in the face of its structure down.
The former limit windings in series of current transformer is in the full-bridge main circuit; One end of the secondary winding of current transformer is connected to an end of first controllable switch S 1 and an end of second controllable switch S 2, and the other end of the secondary winding of current transformer is connected to an end of the 3rd controllable switch S 3 and an end of the 4th controllable switch S 4; The end of current sense resistor Rs is connected to the other end of first controllable switch S 1 and the other end of the 3rd controllable switch S 3; The other end of current sense resistor Rs is connected to the other end of second controllable switch S 2 and the other end and the ground connection of the 4th controllable switch S 4; Wherein first controllable switch S 1, second controllable switch S 2, the 3rd controllable switch S 3 and the 4th controllable switch S 4; Be used under the effect of control signal, for the induction current of the secondary winding of current transformer provides path to current sense resistor Rs.
In the correlation technique, current sense resistor Rs will instead irritate current detecting and become corresponding proportional forward voltage.In the embodiment of the invention, under the control of four controllable switch S 1, S2, S3, S4, current sense resistor Rs will instead irritate current detecting and become corresponding proportional negative voltage.Because control chip wave limiting protection operating valve threshold voltage is a malleation; Therefore the anti-corresponding negative voltage of electric current of irritating is can not protect action by the flip chip wave limiting; Promptly can the hidden danger that big anti-filling electric current false triggering control chip wave limiting protects action to cause that power supply burns be eliminated through technical scheme of the present invention, thus the reliability of raising power supply.
Need to prove, bridge-type current detection circuit of the present invention be input as the former limit of full-bridge AC signal, be output as current detection signal, this signal is input to the current detecting pin of current-mode control chip, makes pwm signal follow the variation of input current and change.
Need to prove that gate-controlled switch is open-minded when control signal is high level, during opening, electric current can be crossed switch by bidirectional flow; And gate-controlled switch turn-offs when control signal is low level, at blocking interval, except very little leakage current, can not flow through the electric current of any direction on the switch.
In the face of will instead irritating current detecting, the current sense resistor Rs under four controllable switch S 1, S2, S3, S4 control become the process of corresponding proportional negative voltage to be described in detail down.
Need to prove that in embodiments of the present invention, when in the main topological structure when switching tube Q1, Q4 conducting, it is forward current that the current transformer primary current flows to CSB from CSA, otherwise the electric current that detects is the anti-electric current of irritating; When in the main topological structure when switching tube Q2, Q3 conducting, it is forward current that the current transformer primary current flows to CSA from CSB, otherwise the electric current that detects is the anti-electric current of irritating.
Fig. 6 is according to controllable switch S 1, S2, S3, S4 in the electric current detecting structure of the embodiment of the invention; And switching tube VT is responsible for the driving sequential chart of Q1, Q2, Q3, Q4 with respect to full-bridge; As shown in Figure 6, when Q1 and Q4 open, S1 and S4 conducting; This moment, the CT secondary current passed through S1, S4 and Rs conducting, on Rs, detected the size and the direction of current signal; When electric current when CSA flows to CSB, main topological energy is sent by the input power supply, the CT secondary current again through Rs, returns to form loop from S4 earlier through S1 at last, on Rs, forms corresponding proportional forward voltage; And when electric current when CSB flows to CSA, main topological energy send toward the input power supply, promptly this moment, electric current be the anti-electric current of irritating, the CT secondary current again through Rs, returns to form loop from S1 earlier through S4 at last, thus on Rs the corresponding proportional negative voltage of formation.So the last forward voltage of Rs corresponds to forward current, negative voltage corresponds to anti-filling electric current.According to the full-bridge work principle, the anti-electric current of irritating is created in the early stage that main switch is opened, and mainly is to be poured into former limit owing to secondary current under the various situation is counter to produce.
Fig. 7 is the synoptic diagram that detects the current detection signal that obtains according to the bridge-type current detection circuit of the embodiment of the invention, and as shown in Figure 7, this signal is positive and negative.
Preferably, the bridge-type current detection circuit also comprises: benchmark power supply Ur is used to current sense resistor Rs a fixing forward dividing potential drop is provided; Biasing divider resistance R1, wherein, an end of biasing divider resistance is connected to benchmark power supply Ur, and the other end of biasing divider resistance is connected to the end of current sense resistor Rs.
In this preferred embodiment, the voltage of current sense resistor is formed by stacking two parts: 1, the voltage signal that on current sense resistor, produces of the secondary winding induction current of current transformer; 2, the fixedly forward bias that on current sense resistor, produces of bias supply part.
Preferably, the bridge-type current detection circuit also comprises: filtering circuit is used for the electric current that current sense resistor Rs detects is carried out filtering.
In this preferred embodiment, filtering circuit carries out filtering to the voltage signal of importing this filter network, thereby suppresses to weaken the amplitude of a part of noise.
Preferably, filtering circuit comprises: resistance R 2, and wherein, an end of resistance R 2 is connected to the end of current sense resistor Rs, and the other end of resistance R 2 is exported filtered electric current; Capacitor C 2, wherein, an end of capacitor C 2 is connected to the other end of resistance R 2, the other end ground connection of capacitor C 2.
Preferably, the bridge-type current detection circuit also comprises: diode D, its negative pole is connected to the other end of resistance R 2, plus earth.
Preferably, diode D is the schottky diode that conduction voltage drop is lower than 0.3V.
In this preferred embodiment, the negative voltage of the clamped control chip current detection signal of diode D input pin all is no more than under any condition-0.3V, thereby can protect control chip.
Preferably, the bridge-type current detection circuit also comprises: MOS switching tube VT, its drain electrode is connected to the other end of resistance R 2, its source ground.
Preferably, MOS switching tube VT is used under the effect of control signal, with first controllable switch S 1, second controllable switch S 2, the 3rd controllable switch S 3 and/or 4 conductings simultaneously of the 4th controllable switch S.
Preferably, the ON time of MOS switching tube VT is no more than 100ns.
In this preferred embodiment, MOS switching tube VT can independently the topology person in charge's switching noise be clamped to ground level in the future, thereby final current detection signal forward position switching noise is eliminated.
Preferably, MOS switching tube VT is the little small-signal N-channel MOS pipe of conducting resistance.
To combine instance that the implementation procedure of the embodiment of the invention is described in detail below.
Fig. 8 is the synoptic diagram of bridge-type current detection circuit according to the preferred embodiment of the invention, and is as shown in Figure 8, on the basis of bridge-type current detection circuit shown in Figure 5, increased Ur and R1, R2 and C2, D and VT successively.Be described in greater detail through preferred embodiment one to preferred embodiment three below.
Preferred embodiment one
The preferred embodiment of the present invention one has increased Ur and R1 on the basis of bridge-type current detection circuit shown in Figure 5.
Fig. 9 is the synoptic diagram that detects the current detection signal that obtains according to the bridge-type current detection circuit of the preferred embodiment of the present invention one.Owing on Rs, added a forward bias through Ur and R1, so this bridge-type current detection circuit current detection signal of detecting acquisition bias voltage of a forward that on the basis of Fig. 7, superposeed, thereby current detection signal integral body is up squinted.
Need to prove; The forward bias voltage size that is added on the Rs can obtain through circuit debugging; The present invention is through changing the power output end load; Test the negative pressure of stable state on the Rs in actions such as unloaded, fully loaded, empty fully loaded saltus steps, and get the maximum negative pressure of absolute value wherein confirm as the forward bias that will superpose big or small.Thereby can guarantee that in circuit steady operation process, the stable state negative voltage that detects outside the noise all has been converted into forward voltage.
Preferred embodiment two
The preferred embodiment of the present invention two has increased Ur, R1, R2 and C2 on the basis of bridge-type current detection circuit shown in Figure 5.
Figure 10 is the synoptic diagram that detects the current detection signal that obtains according to the bridge-type current detection circuit of the preferred embodiment of the present invention two.The current detection signal of forward bias voltage input R2, C2 filter network owing to superposeed, after filtering (shown in figure 10, as can to find out that the forward position noise significantly reduces), the current detecting pin of input control chip.
Should be noted that choosing of R2, C2 filtering parameter can not be too by force can not be too a little less than; Filter capacity is too strong; Can be flat the filter of the forward current peak value in each cycle in the current detecting waveform; Filtered out the peaked peak point of real performance full-bridge former limit principal current, this can cause current loop control inaccurate, causes burning of power module when serious.And if filter capacity too a little less than, then carry the wave limiting action that peak electricity that start moment produces fails to be convened for lack of a quorum and triggers control chip, thereby make power supply drive not machine at Power supply belt Da Rong.So the value of this R2, C2 filtering parameter need be according to the concrete condition of fabric swatch, confirm through debugging.
Preferred embodiment three
The preferred embodiment of the present invention three has increased Ur, R1, R2, C2, D and VT on the basis of bridge-type current detection circuit shown in Figure 5.
Figure 11 is the synoptic diagram that detects the current detection signal that obtains according to the bridge-type current detection circuit of the preferred embodiment of the present invention three.Because the diode D at control chip CS pin place must select for use conduction voltage drop to be lower than the schottky diode of 0.3V.The effect of this diode is the negative pressure at clamped control chip current detecting pin place.When there is a very big anti-filling electric current on the former limit of power supply; Should instead irritate electric current formed negative pressure can not eliminate through the fixing direct current biasing that superposes fully; This moment, diode D meeting conducting was clamped below 0.3V with the negative pressure level at control chip CS pin place, and the protection chip is not damaged.
The small-signal metal-oxide-semiconductor VT that the CS pin place of control chip increases, its drive signal is seen shown in Figure 6.(this is because the rising edge of drive signal is simultaneously to VT to slightly before opening of opening of pipe every group of full-bridge; But because VT is the small-signal metal-oxide-semiconductor; Qg is little, so can be open-minded faster), opening holds time is no more than 100ns; Its effect is (to see Figure 11) to ground with the forward position noise of current detection signal is clamped, thoroughly eliminates the hidden danger of forward position noise false triggering control chip wave limiting action.
In sum, according to the abovementioned embodiments of the present invention, a kind of bridge-type current detection circuit is provided.Through the present invention, under the control of four controllable switch S 1, S2, S3, S4, current sense resistor Rs will instead irritate current detecting and become corresponding proportional negative voltage.Because control chip wave limiting protection operating valve threshold voltage is a malleation; Therefore the anti-corresponding negative voltage of electric current of irritating is can not protect action by the flip chip wave limiting; Promptly can the hidden danger that big anti-filling electric current false triggering control chip wave limiting protects action to cause that power supply burns be eliminated through technical scheme of the present invention, thus the reliability of raising power supply.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a bridge-type current detection circuit is characterized in that, comprising:
Current transformer; Wherein, The former limit windings in series of said current transformer is in the full-bridge main circuit; One end of the secondary winding of said current transformer is connected to an end of first gate-controlled switch (S1) and an end of second gate-controlled switch (S2), and the other end of the secondary winding of said current transformer is connected to an end of the 3rd gate-controlled switch (S3) and an end of the 4th gate-controlled switch (S4);
Current sense resistor (Rs); Wherein, One end of said current sense resistor (Rs) is connected to the other end of said first gate-controlled switch (S1) and the other end of said the 3rd gate-controlled switch (S3); The other end of said current sense resistor (Rs) is connected to the other end and the ground connection of the other end and said the 4th gate-controlled switch (S4) of said second gate-controlled switch (S2); Wherein said first gate-controlled switch (S1), said second gate-controlled switch (S2), said the 3rd gate-controlled switch (S3) and said the 4th gate-controlled switch (S4) are used under the effect of control signal, for the induction current of the secondary winding of said current transformer provides path to said current sense resistor (Rs).
2. bridge-type current detection circuit according to claim 1 is characterized in that, also comprises:
Benchmark power supply (Ur) is used to said current sense resistor (Rs) a fixing forward dividing potential drop is provided;
Biasing divider resistance (R1), wherein, an end of said biasing divider resistance is connected to said benchmark power supply (Ur), and the other end of said biasing divider resistance is connected to an end of said current sense resistor (Rs).
3. bridge-type current detection circuit according to claim 1 is characterized in that, also comprises: filtering circuit is used for the electric current that said current sense resistor (Rs) detects is carried out filtering.
4. bridge-type current detection circuit according to claim 3 is characterized in that, said filtering circuit comprises:
Resistance (R2), wherein, an end of said resistance (R2) is connected to an end of said current sense resistor (Rs), and the other end of said resistance (R2) is exported filtered electric current;
Electric capacity (C2), wherein, an end of said electric capacity (C2) is connected to the other end of said resistance (R2), the other end ground connection of said electric capacity (C2).
5. bridge-type current detection circuit according to claim 4 is characterized in that, also comprises: diode (D), its negative pole is connected to the other end of said resistance (R2), plus earth.
6. bridge-type current detection circuit according to claim 5 is characterized in that, said diode (D) is lower than the schottky diode of 0.3V for conduction voltage drop.
7. bridge-type current detection circuit according to claim 4 is characterized in that, also comprises: MOS switching tube (VT), its drain electrode is connected to the other end of said resistance (R2), its source ground.
8. bridge-type current detection circuit according to claim 7; It is characterized in that; Said MOS switching tube (VT) is used under the effect of said control signal, with the conducting simultaneously of said first gate-controlled switch (S1), said second gate-controlled switch (S2), said the 3rd gate-controlled switch (S3) and/or said the 4th gate-controlled switch (S4).
9. bridge-type current detection circuit according to claim 8 is characterized in that, the ON time of said MOS switching tube (VT) is no more than 100ns.
10. bridge-type current detection circuit according to claim 7 is characterized in that, said MOS switching tube (VT) is a small-signal N-channel MOS pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110037090.8A CN102636676B (en) | 2011-02-12 | 2011-02-12 | Bridge-type current detecting circuit |
| PCT/CN2011/083245 WO2012106967A1 (en) | 2011-02-12 | 2011-11-30 | Bridge current detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110037090.8A CN102636676B (en) | 2011-02-12 | 2011-02-12 | Bridge-type current detecting circuit |
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| CN102636676B CN102636676B (en) | 2014-09-10 |
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| US9924570B2 (en) | 2014-07-28 | 2018-03-20 | Tridonic Gmbh & Co Kg | Isolated active circuit for measuring the current of an illuminant on the secondary side |
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| WO2018210200A1 (en) * | 2017-05-15 | 2018-11-22 | 赤多尼科两合股份有限公司 | Output-current measurement circuit for resonant converter |
| CN107703345A (en) * | 2017-11-08 | 2018-02-16 | 合肥东胜汽车电子有限公司 | A kind of new full-bridge transformer is galvanically isolated detection circuit |
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Also Published As
| Publication number | Publication date |
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| WO2012106967A1 (en) | 2012-08-16 |
| CN102636676B (en) | 2014-09-10 |
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