CN102636676B - Bridge-type current detecting circuit - Google Patents
Bridge-type current detecting circuit Download PDFInfo
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- CN102636676B CN102636676B CN201110037090.8A CN201110037090A CN102636676B CN 102636676 B CN102636676 B CN 102636676B CN 201110037090 A CN201110037090 A CN 201110037090A CN 102636676 B CN102636676 B CN 102636676B
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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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- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
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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 adds the schematic diagram of the topological structure of secondary synchronous rectification according to the full-bridge of correlation technique, as shown in Figure 1, current transformer (CURRENT TRANSFORMER, referred to as CT) primary current equals full-bridge transformer primary side electric current.
Switching tube Q1, Q4 conducting, CT primary current flows to CSB from CSA, and now the energy of power supply passes to secondary from transformer primary side, and whole circuit energy is to send from input power, and the electric current that current detection circuit detects is forward current; And switching tube Q1, Q4 conducting, CT primary current flows to CSA from CSB, and circuit topology energy recharges toward input power place, and the electric current that now current detection circuit detects is the anti-electric current of filling with.In like manner, switching tube Q2, Q3 conducting, CT primary current flows to CSA from CSB, and the electric current that current detection circuit detects is forward current; Otherwise switching tube Q2, Q3 conducting, CT primary current flows to CSB from CSA, and the electric current that current detection circuit detects is the anti-electric current of filling with.Anti-filling electric current is because secondary energy in various situations is counter, to be poured into former limit to produce.
Fig. 2 is according to the schematic diagram of the bridge-type current detection circuit of correlation technique, and as shown in Figure 2, when CT primary current flows to CSB from CSA, according to Same Name of Ends relation, CT secondary induction current is first through D1, then through Rs, finally from D4, returns, and forms loop.On Rs, form voltage, thereby by Ohm law, can draw the secondary current size of CT, according to the former secondary turn ratio of CT relation, obtain CT primary current size, namely full-bridge main-transformer size of current; And CT primary current is while flowing to CSA from CSB, CT secondary induction current is first through D3, then through Rs, finally from D2, returns to form loop.On Rs, form voltage, thereby can obtain now CT primary current size, namely full-bridge main-transformer size of current.
No matter how conducting of Q1, Q2, Q3, Q4, the electric current in full-bridge main circuit is forward current or the anti-electric current of filling with, 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 integrally-built schematic diagram of the current mode full-bridge of correlation technique and synchronous rectification, as shown in Figure 3, D1, D2, D3, D4 function is exactly a full-wave rectification, by Rs, the positive and negative AC signal on CT is rectified into corresponding positive voltage signal, this voltage signal is through R2, after C2 filtering, be input to the current detecting pin (CURRENTSENSE of current-mode control chip, referred to as CS), current-mode control chip is adjusted pulse-length modulation (PULSE WIDTHMODULATION according to CS pin level, referred to as PWM) dutycycle of signal size, PWM ripple is as the OUTA in 3 in figure, OUTB.
Fig. 4 is according to the schematic diagram of the current detection signal of the detection acquisition of correlation technique, as shown in Figure 4, for adopting to obtain the CT current waveform of one-period (full-bridge two groups open half period to managing each) on Rs resistance, wherein the waveform of every half period is divided into again stage 1 and stage 2 (in Fig. 4 respectively by 1 and 2 signs).By analysis in known Fig. 4 being anti-filling current commutates of stage 1 correspondence and voltage waveform.When secondary is large anti-while filling with the function of current to former limit, now this current detection circuit will instead be filled with current detecting and be become corresponding proportional forward voltage.
But the anti-electric current of filling with is larger, corresponding forward voltage is larger, and CS signal voltage is larger.When CS signal surpasses the inner wave limiting protective valve of control chip threshold voltage, by false triggering control chip wave limiting protection action, thereby cause that power module burns.
Summary of the invention
For current sense resistor Rs in correlation technique, the anti-current detecting of filling with is become to the problem of corresponding proportional forward voltage and proposes 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, provide a kind of bridge-type current detection circuit.
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 full-bridge main circuit, one end of the secondary winding of current transformer is connected to one end of the first gate-controlled switch and one end of the second gate-controlled switch, and the other end of the secondary winding of current transformer is connected to one end of the 3rd gate-controlled switch and one end of the 4th gate-controlled switch; Current sense resistor, wherein, one end of current sense resistor is connected to the other end of the first gate-controlled switch and the other end of the 3rd gate-controlled switch, the other end of current sense resistor is connected to the other end the ground connection of the other end and the 4th gate-controlled switch of the second gate-controlled switch, wherein the first gate-controlled switch, the second gate-controlled switch, the 3rd gate-controlled switch and the 4th gate-controlled switch, for 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: benchmark power supply, is used to current sense resistor that a fixing forward dividing potential drop is provided; Biasing divider resistance, wherein, one end of biasing divider resistance is connected to benchmark power supply, and the other end of biasing divider resistance is connected to one end of current sense resistor.
Further, above-mentioned bridge-type current detection circuit also comprises: filtering circuit, carries out filtering for the electric current that current sense resistor is detected.
Further, filtering circuit comprises: resistance, and wherein, one end of resistance is connected to one end of current sense resistor, the electric current after the other end output filtering of resistance; Electric capacity, wherein, one 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 that conduction voltage drop is lower than the schottky diode of 0.3V.
Further, above-mentioned bridge-type current detection circuit also comprises: MOS switching tube, its drain electrode is connected to the other end of resistance, its source ground.
Further, MOS switching tube is under the effect of control signal, with the conducting simultaneously of the first gate-controlled switch, the 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, MOS switching tube is small-signal N-channel MOS pipe.
By the present invention, under the control of four controllable switch S 1, S2, S3, S4, current sense resistor Rs will instead fill with current detecting and become corresponding proportional negative voltage.Because control chip wave limiting protection operating valve value voltage is malleation; therefore anti-negative voltage corresponding to electric current of filling with is can the protection of flip chip wave limiting not move; by technical scheme of the present invention, can fill with electric current false triggering control chip wave limiting protection action and cause that the hidden danger that power supply burns eliminates large anti-, thereby improve the reliability of power supply.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 adds the schematic diagram of the topological structure of secondary synchronous rectification according to the full-bridge of correlation technique;
Fig. 2 is according to the schematic diagram of the bridge-type current detection circuit of correlation technique;
Fig. 3 is according to the integrally-built schematic diagram of the current mode full-bridge of correlation technique and synchronous rectification;
Fig. 4 is according to the schematic diagram of the current detection signal of the detection acquisition of correlation technique;
Fig. 5 is according to the schematic diagram of the bridge-type current detection circuit of the embodiment of the present invention;
Fig. 6 is according to controllable switch S 1, S2, S3, S4 in the electric current detecting structure of the embodiment of the present invention, and switching tube VT is responsible for the driving sequential chart of Q1, Q2, Q3, Q4 with respect to full-bridge;
Fig. 7 detects the schematic diagram of the current detection signal obtaining according to the bridge-type current detection circuit of the embodiment of the present invention;
Fig. 8 is the schematic diagram of bridge-type current detection circuit according to the preferred embodiment of the invention;
Fig. 9 detects the schematic diagram of the current detection signal obtaining according to the bridge-type current detection circuit of the preferred embodiment of the present invention one;
Figure 10 detects the schematic diagram of the current detection signal obtaining according to the bridge-type current detection circuit of the preferred embodiment of the present invention two;
Figure 11 detects the schematic diagram of the current detection signal obtaining according to the bridge-type current detection circuit of the preferred embodiment of the present invention three.
Embodiment
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
The embodiment of the present invention provides a kind of bridge-type current detection circuit.Fig. 5 is according to the schematic diagram of the bridge-type current detection circuit of the embodiment of the present invention, as shown in Figure 5, comprises current transformer, current sense resistor Rs, the first controllable switch S 1, the second controllable switch S 2, the 3rd controllable switch S 3 and the 4th controllable switch S 4.Below its structure is described in detail.
The former limit windings in series of current transformer is in full-bridge main circuit, one end of the secondary winding of current transformer is connected to one end of the first controllable switch S 1 and one end of the second controllable switch S 2, and the other end of the secondary winding of current transformer is connected to one end of the 3rd controllable switch S 3 and one end of the 4th controllable switch S 4; One end of current sense resistor Rs is connected to the other end of the 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 the second controllable switch S 2 and the other end the ground connection of the 4th controllable switch S 4, wherein the first controllable switch S 1, the second controllable switch S 2, the 3rd controllable switch S 3 and the 4th controllable switch S 4, for 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 correlation technique, current sense resistor Rs will instead fill with current detecting and become corresponding proportional forward voltage.In the embodiment of the present invention, under the control of four controllable switch S 1, S2, S3, S4, current sense resistor Rs will instead fill with current detecting and become corresponding proportional negative voltage.Because control chip wave limiting protection operating valve value voltage is malleation; therefore anti-negative voltage corresponding to electric current of filling with is can the protection of flip chip wave limiting not move; by technical scheme of the present invention, can fill with electric current false triggering control chip wave limiting protection action and cause that the hidden danger that power supply burns eliminates large anti-, thereby improve the reliability of power supply.
It should be noted that, 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.
It should be noted that, when control signal is high level, gate-controlled switch is open-minded, and 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, on switch, except very little leakage current, can not flow through the electric current of any direction.
To the current sense resistor Rs under controlling at four controllable switch S 1, S2, S3, S4, become the process of corresponding proportional negative voltage to be described in detail the anti-current detecting of filling with below.
It should be noted that, in embodiments of the present invention, in main topological structure, when switching tube Q1, Q4 conducting, it is forward current that current transformer primary current flows to CSB from CSA, otherwise the electric current detecting is the anti-electric current of filling with; In main topological structure, when switching tube Q2, Q3 conducting, it is forward current that current transformer primary current flows to CSA from CSB, otherwise the electric current detecting is the anti-electric current of filling with.
Fig. 6 is according to controllable switch S 1, S2, S3, S4 in the electric current detecting structure of the embodiment of the present 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, now CT secondary current, by S1, S4 and Rs conducting, detects size and the direction of current signal on Rs; When electric current flows to CSB from CSA, main topological energy is sent by input power, and CT secondary current is first through S1, then through Rs, finally from S4, returns to form loop, forms corresponding proportional forward voltage on Rs; And when electric current flows to CSA from CSB, main topological energy send toward input power, now electric current is the anti-electric current of filling with, and CT secondary current is first through S4, then through Rs, finally from S1, returns to form loop, thereby on Rs, forms corresponding proportional negative voltage.So the forward voltage on Rs corresponds to forward current, negative voltage corresponds to anti-filling electric current.According to the principle of full-bridge work, the anti-electric current of filling with is created in the early stage that main switch is opened, and is mainly because secondary current in various situations is counter, to be poured into former limit to produce.
Fig. 7 detects the schematic diagram of the current detection signal obtaining according to the bridge-type current detection circuit of the embodiment of the present invention, as shown in Figure 7, this signal is positive and negative.
Preferably, bridge-type current detection circuit also comprises: benchmark power supply Ur, is used to current sense resistor Rs that a fixing forward dividing potential drop is provided; Biasing divider resistance R1, wherein, one end of biasing divider resistance is connected to benchmark power supply Ur, and the other end of biasing divider resistance is connected to one end of current sense resistor Rs.
In this preferred embodiment, the voltage of current sense resistor is formed by stacking by two parts: the voltage signal that 1, the secondary winding induction current of current transformer produces on current sense resistor; 2, the fixedly forward bias that bias supply part produces on current sense resistor.
Preferably, bridge-type current detection circuit also comprises: filtering circuit, carries out filtering for the electric current that current sense resistor Rs is detected.
In this preferred embodiment, filtering circuit carries out filtering to inputting the voltage signal of this filter network, thereby suppresses to weaken the amplitude of a part of noise.
Preferably, filtering circuit comprises: resistance R 2, and wherein, one end of resistance R 2 is connected to one end of current sense resistor Rs, the electric current after the other end output filtering of resistance R 2; Capacitor C 2, wherein, one 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, 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 that conduction voltage drop is lower than the schottky diode of 0.3V.
In this preferred embodiment, be all no more than under any condition-0.3V of negative voltage of the clamped control chip current detection signal of diode D input pin, thus can protect control chip.
Preferably, 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 under the effect of control signal, with the first controllable switch S 1, the second controllable switch S 2, the 3rd controllable switch S 3 and/or the 4th controllable switch S 4 conductings simultaneously.
Preferably, the ON time of MOS switching tube VT is no more than 100ns.
In this preferred embodiment, the MOS switching tube VT in the future autonomous topological switching noise of being responsible for is clamped to ground level, thereby final current detection signal forward position switching noise is eliminated.
Preferably, MOS switching tube VT is the small-signal N-channel MOS pipe that conducting resistance is little.
Below in conjunction with example, the implementation procedure of the embodiment of the present invention is described in detail.
Fig. 8 is the schematic diagram of bridge-type current detection circuit according to the preferred embodiment of the invention, as shown in Figure 8, on the basis of the bridge-type current detection circuit shown in Fig. 5, has increased successively Ur and R1, R2 and C2, D and VT.Below by preferred embodiment one to preferred embodiment three, be described in greater detail.
Preferred embodiment one
The preferred embodiment of the present invention one has increased Ur and R1 on the basis of the bridge-type current detection circuit shown in Fig. 5.
Fig. 9 detects the schematic diagram of the current detection signal obtaining according to the bridge-type current detection circuit of the preferred embodiment of the present invention one.Owing to having added a forward bias by Ur and R1 on Rs, so this bridge-type current detection circuit detects the current detection signal the obtaining bias voltage of a forward that superposeed on the basis of Fig. 7, thereby current detection signal integral body is up offset.
It should be noted that, the forward bias voltage size being added on Rs can obtain by circuit debugging, the present invention is by changing power output end load, in actions such as unloaded, fully loaded, empty fully loaded saltus steps, test the negative pressure of stable state on Rs, and getting the negative pressure of absolute value maximum wherein, to be defined as the forward bias that will superpose big or small.Thereby can guarantee that, in circuit steady operation process, the stable state negative voltage detecting outside noise has all 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 the bridge-type current detection circuit shown in Fig. 5.
Figure 10 detects the schematic diagram of the current detection signal obtaining according to the bridge-type current detection circuit of the preferred embodiment of the present invention two.Due to current detection signal input R2, the C2 filter network of the forward bias voltage that superposeed, after filtering, (as shown in figure 10, can find out that 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 the filter of the forward current peak value in each cycle in current detecting waveform is flat, the peaked peak point of the real performance former limit of full-bridge principal current has been filtered out, this can cause current loop control inaccurate, causes burning of power module when serious.And if filter capacity too a little less than, at Power supply belt great Rong, carry peak electricity that booting moment produces and fail to be convened for lack of a quorum and trigger the wave limiting action of control chip, thereby make power supply not drive machine.So the value of this R2, C2 filtering parameter, need to, according to the concrete condition of fabric swatch, determine by 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 the bridge-type current detection circuit shown in Fig. 5.
Figure 11 detects the schematic diagram of the current detection signal obtaining according to the bridge-type current detection circuit of the preferred embodiment of the present invention three.Due to the diode D at control chip CS pin place, must select conduction voltage drop 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 large anti-filling electric current on the former limit of power supply; the electric current formed negative pressure of this anti-filling can not be eliminated completely by the fixing direct current biasing that superposes; now diode D meeting conducting, the negative pressure level at control chip CS pin place is clamped below 0.3V, and protection chip is not damaged.
The small-signal metal-oxide-semiconductor VT that the CS pin place of control chip increases, it drives signal as shown in Figure 6.VT opens pipe every group of full-bridge slightly before opens, and (this is to be owing to driving the rising edge of signal simultaneously, but because VT is small-signal metal-oxide-semiconductor, Qg is little, so can be open-minded faster), opening holds time is no more than 100ns, its effect be by the forward position noise of current detection signal clamped to (seeing Figure 11), thoroughly eliminate 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, provide a kind of bridge-type current detection circuit.By the present invention, under the control of four controllable switch S 1, S2, S3, S4, current sense resistor Rs will instead fill with current detecting and become corresponding proportional negative voltage.Because control chip wave limiting protection operating valve value voltage is malleation; therefore anti-negative voltage corresponding to electric current of filling with is can the protection of flip chip wave limiting not move; by technical scheme of the present invention, can fill with electric current false triggering control chip wave limiting protection action and cause that the hidden danger that power supply burns eliminates large anti-, thereby improve the reliability of power supply.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in 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 described current transformer is in full-bridge main circuit, one end of the secondary winding of described current transformer is connected to one end of the first gate-controlled switch (S1) and one end of the second gate-controlled switch (S2), and the other end of the secondary winding of described current transformer is connected to one end of the 3rd gate-controlled switch (S3) and one end of the 4th gate-controlled switch (S4);
Current sense resistor (Rs), wherein, one end of described current sense resistor (Rs) is connected to the other end of described the first gate-controlled switch (S1) and the other end of described the 3rd gate-controlled switch (S3), the other end of described current sense resistor (Rs) is connected to the other end the ground connection of the other end and described the 4th gate-controlled switch (S4) of described the second gate-controlled switch (S2), wherein said the first gate-controlled switch (S1), described the second gate-controlled switch (S2), described the 3rd gate-controlled switch (S3) and described the 4th gate-controlled switch (S4) are during opening, electric current can bidirectional flow mistake, for under the effect of control signal, for the induction current of the secondary winding of described current transformer provides path to described 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 described current sense resistor (Rs) that a fixing forward dividing potential drop is provided;
Biasing divider resistance (R1), wherein, one end of described biasing divider resistance is connected to described benchmark power supply (Ur), and the other end of described biasing divider resistance is connected to one end of described current sense resistor (Rs).
3. bridge-type current detection circuit according to claim 1, is characterized in that, also comprises: filtering circuit, carries out filtering for the electric current that described current sense resistor (Rs) is detected.
4. bridge-type current detection circuit according to claim 3, is characterized in that, described filtering circuit comprises:
Resistance (R2), wherein, one end of described resistance (R2) is connected to one end of described current sense resistor (Rs), the electric current after the other end output filtering of described resistance (R2);
Electric capacity (C2), wherein, one end of described electric capacity (C2) is connected to the other end of described resistance (R2), the other end ground connection of described 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 described resistance (R2), plus earth.
6. bridge-type current detection circuit according to claim 5, is characterized in that, described diode (D) is that conduction voltage drop is lower than the schottky diode of 0.3V.
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 described resistance (R2), its source ground.
8. bridge-type current detection circuit according to claim 7, it is characterized in that, described MOS switching tube (VT) is under the effect of described control signal, with described the first gate-controlled switch (S1), described the second gate-controlled switch (S2), described the 3rd gate-controlled switch (S3) and/or the conducting simultaneously of described the 4th gate-controlled switch (S4).
9. bridge-type current detection circuit according to claim 8, is characterized in that, the ON time of described MOS switching tube (VT) is no more than 100ns.
10. bridge-type current detection circuit according to claim 7, is characterized in that, described MOS switching tube (VT) is small-signal N-channel MOS pipe.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
|---|---|---|---|
| CN201110037090.8A CN102636676B (en) | 2011-02-12 | 2011-02-12 | Bridge-type current detecting circuit |
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| CN102636676A CN102636676A (en) | 2012-08-15 |
| CN102636676B true CN102636676B (en) | 2014-09-10 |
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| CN201110037090.8A Active CN102636676B (en) | 2011-02-12 | 2011-02-12 | Bridge-type current detecting circuit |
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| 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 |
| DE102018132656A1 (en) * | 2018-12-18 | 2020-06-18 | Tridonic Gmbh & Co Kg | Current sensor and measuring method for the switched detection of an alternating current |
| CN110034544B (en) * | 2019-03-25 | 2022-07-15 | 深圳市商宇电子科技有限公司 | IGBT driving and wave-by-wave current limiting circuit control method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2704849Y (en) * | 2004-06-11 | 2005-06-15 | 石家庄长通电器有限公司 | Effective induction style electric energy meter |
| CN101738531A (en) * | 2009-12-31 | 2010-06-16 | 杭州凯尔达电焊机有限公司 | Method for detecting output current of inverting welding machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0687657B2 (en) * | 1986-06-16 | 1994-11-02 | 三洋電機株式会社 | Self-exciting converter |
| JPH04294A (en) * | 1990-04-12 | 1992-01-06 | Toyota Autom Loom Works Ltd | Current detecting circuit in inverter circuit |
| JP2001103741A (en) * | 1999-10-01 | 2001-04-13 | Toyota Autom Loom Works Ltd | Switching power source |
| CN2619409Y (en) * | 2003-05-13 | 2004-06-02 | 尼克森微电子股份有限公司 | Current detection circuit of backward AC power supply device |
| JP4485337B2 (en) * | 2004-12-08 | 2010-06-23 | 株式会社日立製作所 | Current detection circuit, power supply control circuit, power supply device, power supply system, and electronic device |
-
2011
- 2011-02-12 CN CN201110037090.8A patent/CN102636676B/en active Active
- 2011-11-30 WO PCT/CN2011/083245 patent/WO2012106967A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2704849Y (en) * | 2004-06-11 | 2005-06-15 | 石家庄长通电器有限公司 | Effective induction style electric energy meter |
| CN101738531A (en) * | 2009-12-31 | 2010-06-16 | 杭州凯尔达电焊机有限公司 | Method for detecting output current of inverting welding machine |
Also Published As
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| CN102636676A (en) | 2012-08-15 |
| WO2012106967A1 (en) | 2012-08-16 |
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