CN114355015A - Nondestructive input current detection method for internal power tube of wireless charging transmitting terminal - Google Patents
Nondestructive input current detection method for internal power tube of wireless charging transmitting terminal Download PDFInfo
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Abstract
The invention provides a nondestructive input current detection method for a power tube in a wireless charging transmitting terminal, wherein the wireless charging transmitting terminal comprises a switching tube Q1, a switching tube Q2, a switching tube Q3 and a switching tube Q4; the method comprises the following steps: and detecting the conduction current of two lower tubes of a switching tube Q2 and a switching tube Q4 in the wireless charging transmitting end, and realizing lossless input current detection by adjusting the switching time sequence of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4. According to the invention, the conduction current of the two lower tube power tubes in the wireless charging transmitting end is detected, the current of the dead zone stage of the two lower tube power tubes does not flow into the power supply end PVIN any more by innovatively adjusting the switching time sequence of the power tubes, and the detection window signals of the detection currents of the two lower tube power tubes are correspondingly generated, so that the nondestructive input current detection of the power tubes can be realized.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a nondestructive input current detection method for a power tube in a wireless charging transmitting terminal.
Background
The wireless charging transmitting terminal chip needs to be capable of detecting the input average current with high precision. The following two schemes are available for detecting current: the first scheme is to connect an external or chip-internal metal detection resistor in series at the power supply terminal PVIN or the ground terminal PGND to detect the current flowing through the detection resistor, as shown in fig. 1; the second scheme is to detect the input current by detecting the current flowing through the power tube. The first solution requires a resistor (typically 5-20 m ohms) in series with the power path, which results in efficiency losses. And adopt external metal to detect resistance and still can increase pin and the cost of chip. The second scheme is a mainstream scheme with low cost at present, but is limited in that the current in the dead zone stage of the power tube cannot be effectively detected, and the detection accuracy of the input current is not high enough, for the following reasons:
the second scheme mainly adopts two modes: the first way is to detect the conduction current of the two upper tubes, i.e. the switch tube Q1 and the switch tube Q3; the second method is to detect the conduction current of the two lower tubes, i.e., the switching tube Q2 and the switching tube Q4. In the two modes, when the switching tubes Q1-Q4 are in the full-bridge mode, the switching tube Q1 and the switching tube Q4 are switched on, and the switching tube Q2 and the switching tube Q3 are switched off; when the switching tube Q1 and the switching tube Q4 are turned off, because there is a dead-zone phase, the switching tube Q2 and the switching tube Q3 are not immediately conducted, the switching tube Q2 and the switching tube Q3 are conducted after the dead-zone phase is ended, and the coil current in the dead-zone phase flows as shown in fig. 2; similarly, when the switch Q2 and the switch Q3 are turned off, there is also a dead-zone phase, the switch Q1 and the switch Q4 are not turned on immediately, the switch Q1 and the switch Q4 are turned on only after the dead-zone phase is ended, and the coil current in the dead-zone phase flows as shown in fig. 3. Fig. 4 shows simulated waveforms of the electrical connection point AC1 between the switching transistor Q1 and the switching transistor Q2 and the electrical connection point AC2 between the switching transistor Q3 and the switching transistor Q4 in the full-bridge mode. Simulated waveforms of the current at the electrical connection point AC1, the electrical connection point AC2 and the power supply terminal PVIN are shown in FIG. 5.
As can be seen from the simulation waveforms, during the dead-zone phase, the current of the coil flows backward to the capacitor of the power supply terminal PVIN through the body diode, so that the inflow current of the power supply terminal PVIN is reduced. Therefore, the current passing through the body diode during the dead time period is also a part of the input current of the power supply terminal PVIN, but the current freewheeling through the body diode cannot be detected in the two current modes because only the current flowing through the channel when the power tube is turned on can be detected. When the current flowing through the body diode when the power tube is closed cannot be detected, a part of input current cannot be detected, so that the detection of the input current is lacked, the part of current can be changed along with a plurality of factors such as input voltage, load current, switching frequency and the like, good compensation cannot be achieved, and the detection precision is not high.
Disclosure of Invention
The invention aims to provide a nondestructive input current detection method for a power tube in a wireless charging transmitting terminal, so as to solve the problem that the current in the dead zone stage of the power tube cannot be effectively detected.
The invention provides a nondestructive input current detection method for a power tube in a wireless charging transmitting terminal, wherein the wireless charging transmitting terminal comprises a switching tube Q1, a switching tube Q2, a switching tube Q3 and a switching tube Q4; the method comprises the following steps:
and detecting the conduction current of two lower tubes of a switching tube Q2 and a switching tube Q4 in the wireless charging transmitting end, and realizing lossless input current detection by adjusting the switching time sequence of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4.
Further, the method for realizing the lossless input current detection by adjusting the switching timing of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 comprises the following steps:
step (1), the free-wheeling current of the dead zone phase of the H2L at the electrical connection point AC1 between the switching tube Q1 and the switching tube Q2 is enabled to flow into the ground terminal PGND through the body diode of the switching tube Q2 and the channel of the switching tube Q4 without flowing into the power supply terminal PVIN by adjusting the switching timing of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4;
step (2), the free-wheeling current of the dead zone phase of the H2L at the electrical connection point AC2 between the switching tube Q3 and the switching tube Q4 is enabled to flow into the ground terminal PGND through the body diode of the switching tube Q4 and the channel of the switching tube Q2 without flowing into the power supply terminal PVIN by adjusting the switching timing of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4;
and (3) the current flowing out through the body diode in the dead zone stage by the two lower tubes of the switching tube Q2 and the switching tube Q4 in the steps (1) and (2) is no longer part of the power supply terminal PVIN, so that after the switching time sequences of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 are adjusted, the lossless input current detection is realized only by detecting the conduction currents of the two lower tubes of the switching tube Q2 and the switching tube Q4.
Specifically, the method for adjusting the switching timings of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 in the step (1) comprises the following steps:
(11) the switching tube Q1 is conducted with the switching tube Q4, and the switching tube Q2 is closed with the switching tube Q3;
(12) the switch tube Q1 is turned off, the switch tube Q4 is turned on continuously, and the switch tube Q2 and the switch tube Q3 are turned off.
Specifically, the method for adjusting the switching timings of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 in the step (2) includes:
(21) the switching tube Q2 is conducted with the switching tube Q3, and the switching tube Q4 is closed with the switching tube Q1;
(22) the switch tube Q3 is turned off, the switch tube Q2 is turned on continuously, and the switch tube Q1 and the switch tube Q4 are turned off.
Furthermore, in the detected conduction currents of the two lower tubes, i.e., the switching tube Q2 and the switching tube Q4, the detection data of the dead zone phase of the H2L of the electrical connection point AC1 and the electrical connection point AC2 need to be shielded.
Further, the method for shielding the detection data of the dead zone phase of the H2L of the electrical connection point AC1 and the electrical connection point AC2 comprises the following steps:
the dead zone phase detection data of the H2L of the electrical connection point AC1 and the electrical connection point AC2 are shielded by adjusting a detection window for detecting the conduction current of two lower tubes of the switching tube Q2 and the switching tube Q4.
In some embodiments, the circuit for detecting the on-state current of the two lower tubes, i.e., the switching tube Q2 and the switching tube Q4, includes a switching tube P1, a switching tube P2, a switching tube P3, a switching tube P4, a switching tube N1, a switching tube N2, a switching tube Q5, a switching tube Q6, an operational amplifier OP1, an operational amplifier OP2, a sampling circuit AC1_ SAMPLE, a sampling circuit AC2_ SAMPLE;
the input end of the sampling circuit AC1_ SAMPLE is connected to the electrical connection point AC1, the output end is connected to the positive input end of the operational amplifier OP1, and the control end is used for inputting the detection window signal of the switching tube Q2; the negative input end of the operational amplifier OP1 is connected with the drain electrode of the switching tube Q5, and the output end is connected with the grid electrode of the switching tube N1; the grid electrode of the switching tube Q5 is connected with a control signal Tie _ h, and the source electrode is grounded; the source electrode of the switch tube N1 is connected with the drain electrode of the switch tube Q5, and the drain electrode of the switch tube N1 is simultaneously connected with the drain electrode and the grid electrode of the switch tube P1; the grid electrode of the switching tube P1 is connected with the grid electrode of the switching tube P2;
the input end of the sampling circuit AC2_ SAMPLE is connected to the electrical connection point AC2, the output end is connected to the positive input end of the operational amplifier OP2, and the control end is used for inputting the detection window signal of the switching tube Q4; the negative input end of the operational amplifier OP2 is connected with the drain electrode of the switching tube Q6, and the output end is connected with the grid electrode of the switching tube N2; the grid electrode of the switching tube Q6 is connected with a control signal Tie _ h, and the source electrode is grounded; the source electrode of the switch tube N2 is connected with the drain electrode of the switch tube Q6, and the drain electrode of the switch tube N2 is simultaneously connected with the drain electrode and the grid electrode of the switch tube P3; the grid electrode of the switching tube P3 is connected with the grid electrode of the switching tube P4;
the drain of the switching tube P2 and the drain of the switching tube P4 are both grounded through a resistor Rsns _ out; the source electrode of the switching tube P1, the source electrode of the switching tube P2, the source electrode of the switching tube P3 and the source electrode of the switching tube P4 are all connected with a power supply voltage.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
according to the invention, the conduction current of the two lower tube power tubes in the wireless charging transmitting end is detected, the current of the dead zone stage of the two lower tube power tubes does not flow into the power supply end PVIN any more by innovatively adjusting the switching time sequence of the power tubes, and the detection window signals of the detection currents of the two lower tube power tubes are correspondingly generated, so that the nondestructive input current detection of the power tubes can be realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a structural diagram of detecting an input current of a wireless charging transmitting terminal chip by setting a detection resistor in the prior art.
Fig. 2 shows that when the switching tube Q1 and the switching tube Q4 are turned on and the switching tube Q2 and the switching tube Q3 are turned off when the input current is detected by detecting the current flowing through the power tube in the prior art; when the switching tube Q1 and the switching tube Q4 are turned off, the flow of the coil current in the dead zone phase is schematically shown.
Fig. 3 shows that when the switching tube Q2 and the switching tube Q3 are turned on and the switching tube Q1 and the switching tube Q4 are turned off when the input current is detected by detecting the current flowing through the power tube in the prior art; when the switching tube Q2 and the switching tube Q3 are turned off, the flow of the coil current in the dead zone phase is schematically shown.
Fig. 4 is a waveform diagram illustrating a simulation of an electrical connection point AC1 between the switching transistor Q1 and the switching transistor Q2 and an electrical connection point AC2 between the switching transistor Q3 and the switching transistor Q4 in a full-bridge mode when detecting an input current by detecting a current flowing through a power transistor in the prior art.
Fig. 5 is a waveform diagram showing a simulation of the current flowing through the power transistor at the electrical connection point AC1, the electrical connection point AC2 and the power supply terminal PVIN.
FIG. 6 shows an embodiment of the present invention in which the switch Q1 and the switch Q4 are turned on, and the switch Q2 and the switch Q3 are turned off; when the switch Q1 is turned off, the switch Q4 is turned on continuously, and the switch Q2 and the switch Q3 are turned off, the flow of the coil current in the dead zone phase is schematically shown.
FIG. 7 shows an embodiment of the present invention in which the switch Q2 and the switch Q3 are turned on, and the switch Q4 and the switch Q1 are turned off; when the switch Q3 is turned off, the switch Q2 is turned on continuously, and the switch Q1 and the switch Q4 are turned off, the flow of the coil current in the dead zone phase is schematically shown.
FIG. 8 is a simulated waveform diagram of the electrical connection points AC1 and AC2 in the full-bridge mode according to the embodiment of the present invention
FIG. 9 is a simulated waveform of the current at the electrical connection point AC1, the electrical connection point AC2 and the power supply terminal PVIN and the detection windows of the two lower tubes of the switch tube Q2 and the switch tube Q4 in the embodiment of the present invention, FIG. 9 is a diagram of the simulated waveform of the detection windows of the two lower tubes of the switch tube Q3578
Fig. 10 is a structural diagram of a circuit for detecting the conduction current of two lower tubes, i.e., the switching tube Q2 and the switching tube Q4 according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
As shown in fig. 1, the present embodiment provides a method for detecting a lossless input current of a power tube in a wireless charging transmitting terminal, including:
and detecting the conduction current of two lower tubes of a switching tube Q2 and a switching tube Q4 in the wireless charging transmitting end, and realizing lossless input current detection by adjusting the switching time sequence of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4.
Specifically, the method for realizing the lossless input current detection by adjusting the switching time sequence of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 comprises the following steps:
step (1), adjusting the switching time sequences of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4:
(11) the switching tube Q1 is conducted with the switching tube Q4, and the switching tube Q2 is closed with the switching tube Q3;
(12) the switching tube Q1 is closed, the switching tube Q4 is continuously conducted, and the switching tube Q2 and the switching tube Q3 are closed;
at this time, the freewheeling current in the dead-band phase of H2L (from high level to low level) of the electrical connection point AC1 between the switching transistor Q1 and the switching transistor Q2 flows into the ground terminal PGND through the body diode of the switching transistor Q2 and the channel of the switching transistor Q4, but does not flow into the power supply terminal PVIN, as shown in fig. 6;
step (2), adjusting the switching time sequences of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4:
(21) the switching tube Q2 is conducted with the switching tube Q3, and the switching tube Q4 is closed with the switching tube Q1;
(22) the switch tube Q3 is turned off, the switch tube Q2 is turned on continuously, and the switch tube Q1 and the switch tube Q4 are turned off.
At this time, the freewheeling current in the dead zone phase of H2L at the electrical connection point AC2 between the switching transistor Q3 and the switching transistor Q4 flows into the ground terminal PGND through the body diode of the switching transistor Q4 and the channel of the switching transistor Q2, but does not flow into the power supply terminal PVIN, as shown in fig. 7;
and (3) the current flowing out through the body diode in the dead zone stage by the two lower tubes of the switching tube Q2 and the switching tube Q4 in the steps (1) and (2) is no longer part of the power supply terminal PVIN, so that after the switching time sequences of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 are adjusted, the lossless input current detection is realized only by detecting the conduction currents of the two lower tubes of the switching tube Q2 and the switching tube Q4.
It should be noted that the whole conduction currents of the switching transistor Q2 and the switching transistor Q4 cannot be detected because the switching transistor Q4 is turned on in the dead-zone phase of H2L of the electrical connection point AC1, but the conduction current of the switching transistor Q4 in this phase does not flow into the power supply terminal PVIN but flows into the ground terminal PGND, and similarly, the switching transistor Q2 is turned on in the dead-zone phase of H2L of the electrical connection point AC2, but the conduction current of the switching transistor Q2 in this phase does not flow into the power supply terminal PVIN and also flows into the ground terminal PGND. Therefore, in the detected conduction currents of the two lower tubes, i.e., the switching tube Q2 and the switching tube Q4, the detection data of the dead zone phase of the H2L of the electrical connection point AC1 and the electrical connection point AC2 need to be shielded. The dead zone phase detection data of the H2L of the electrical connection point AC1 and the electrical connection point AC2 can be shielded by adjusting the detection window for detecting the conduction current of the two lower tubes of the switching tube Q2 and the switching tube Q4. Simulated waveforms of the electrical connection point AC1 and the electrical connection point AC2 in the full-bridge mode are shown in FIG. 8. Fig. 9 shows simulated waveforms of the currents of the electrical connection point AC1, the electrical connection point AC2, and the power supply terminal PVIN, and the detection windows of the two lower tubes of the switch tube Q2 and the switch tube Q4.
As shown in fig. 10, the circuit for detecting the on-state current of the two lower tubes, i.e., the switching tube Q2 and the switching tube Q4, includes a switching tube P1, a switching tube P2, a switching tube P3, a switching tube P4, a switching tube N1, a switching tube N2, a switching tube Q5, a switching tube Q6, an operational amplifier OP1, an operational amplifier OP2, a sampling circuit AC1_ SAMPLE, and a sampling circuit AC2_ SAMPLE;
the input end of the sampling circuit AC1_ SAMPLE is connected to the electrical connection point AC1, the output end is connected to the positive input end of the operational amplifier OP1, and the control end is used for inputting the detection window signal of the switching tube Q2; the negative input end of the operational amplifier OP1 is connected with the drain electrode of the switching tube Q5, and the output end is connected with the grid electrode of the switching tube N1; the grid electrode of the switching tube Q5 is connected with a control signal Tie _ h, and the source electrode is grounded; the source electrode of the switch tube N1 is connected with the drain electrode of the switch tube Q5, and the drain electrode of the switch tube N1 is simultaneously connected with the drain electrode and the grid electrode of the switch tube P1; the grid electrode of the switching tube P1 is connected with the grid electrode of the switching tube P2;
the input end of the sampling circuit AC2_ SAMPLE is connected to the electrical connection point AC2, the output end is connected to the positive input end of the operational amplifier OP2, and the control end is used for inputting the detection window signal of the switching tube Q4; the negative input end of the operational amplifier OP2 is connected with the drain electrode of the switching tube Q6, and the output end is connected with the grid electrode of the switching tube N2; the grid electrode of the switching tube Q6 is connected with a control signal Tie _ h, and the source electrode is grounded; the source electrode of the switch tube N2 is connected with the drain electrode of the switch tube Q6, and the drain electrode of the switch tube N2 is simultaneously connected with the drain electrode and the grid electrode of the switch tube P3; the grid electrode of the switching tube P3 is connected with the grid electrode of the switching tube P4;
the drain of the switching tube P2 and the drain of the switching tube P4 are both grounded through a resistor Rsns _ out; the source electrode of the switching tube P1, the source electrode of the switching tube P2, the source electrode of the switching tube P3 and the source electrode of the switching tube P4 are all connected with a power supply voltage.
In this embodiment, the switching tube Q5 and the switching tube Q2 are similar tubes, the lengths of the MOS tubes of the switching tube Q5 and the switching tube Q2 are the same, and the width ratio is 1: 1000; the switching tube Q6 and the switching tube Q4 are of the same type, the lengths of MOS tubes of the switching tube Q6 and the switching tube Q4 are the same, and the width ratio is 1: 1000.
The operating principle of the circuit for detecting the conduction currents of the two lower tubes of the switching tube Q2 and the switching tube Q4 is as follows:
the circuit for detecting the conduction currents of the two lower tubes, i.e., the switching tube Q2 and the switching tube Q4, is connected to the electrical connection point AC1 and the electrical connection point AC2 at the same time, and the detection is performed only when the corresponding detection window is 1:
that is, when the detection window AC1_ LS _ SAMPLE of the switching tube Q2 is 1, the voltage signal of the electrical connection point AC1 is collected by the sampling circuit AC1_ SAMPLE, and the voltage signal of the electrical connection point AC1 is converted into the current signal I1 by the operational amplifier OP1, the switching tube N1 and the switching tube Q5, and the mirror current I2 is obtained by mirroring the currents of the switching tube P1 and the switching tube P2 in a ratio of 1:1, and the mirror current I2 flows into the resistor Rsns _ out, so as to obtain the voltage signal Vsns _ out.
Similarly, when the detection window AC2_ LS _ SAMPLE of the switching tube Q4 is 1, the voltage signal of the electrical connection point AC2 is collected by the sampling circuit AC2_ SAMPLE, and the voltage signal of the electrical connection point AC2 is converted into the current signal I3 by the operational amplifier OP2, the switching tube N2 and the switching tube Q6, and the mirror current I4 is obtained by mirroring the currents of the switching tube P3 and the switching tube P4 in a ratio of 1:1, and the mirror current I4 flows into the resistor Rsns _ out to obtain the voltage signal Vsns _ out.
In the full-bridge mode, the detection windows of the two lower tubes Q2 and Q4 corresponding to the electrical connection point AC1 and the electrical connection point AC2 are staggered, so that only one current flows into the resistor Rsns _ out at the same time. The voltage signal thus obtained is:
Vsns_out＝(I2+I4)×Rsns_out＝(I_PVIN/1000)×Rsns_out；
wherein, I _ PVIN is a current of the power supply terminal PVIN.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A lossless input current detection method for a power tube in a wireless charging transmitting terminal is characterized in that the wireless charging transmitting terminal comprises a switch tube Q1, a switch tube Q2, a switch tube Q3 and a switch tube Q4; the method comprises the following steps:
and detecting the conduction current of two lower tubes of a switching tube Q2 and a switching tube Q4 in the wireless charging transmitting end, and realizing lossless input current detection by adjusting the switching time sequence of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4.
2. The method for lossless input current detection of power tube in wireless charging transmitting terminal according to claim 1, wherein the method for lossless input current detection by adjusting the switching timing of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 comprises:
step (1), the free-wheeling current of the dead zone phase of the H2L at the electrical connection point AC1 between the switching tube Q1 and the switching tube Q2 is enabled to flow into the ground terminal PGND through the body diode of the switching tube Q2 and the channel of the switching tube Q4 without flowing into the power supply terminal PVIN by adjusting the switching timing of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4;
step (2), the free-wheeling current of the dead zone phase of the H2L at the electrical connection point AC2 between the switching tube Q3 and the switching tube Q4 is enabled to flow into the ground terminal PGND through the body diode of the switching tube Q4 and the channel of the switching tube Q2 without flowing into the power supply terminal PVIN by adjusting the switching timing of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4;
and (3) the current flowing out through the body diode in the dead zone stage by the two lower tubes of the switching tube Q2 and the switching tube Q4 in the steps (1) and (2) is no longer part of the power supply terminal PVIN, so that after the switching time sequences of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 are adjusted, the lossless input current detection is realized only by detecting the conduction currents of the two lower tubes of the switching tube Q2 and the switching tube Q4.
3. The method for detecting the lossless input current of the power tube in the wireless charging transmitting terminal as claimed in claim 2, wherein the method for adjusting the switching timings of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 in step (1) is as follows:
(11) the switching tube Q1 is conducted with the switching tube Q4, and the switching tube Q2 is closed with the switching tube Q3;
(12) the switch tube Q1 is turned off, the switch tube Q4 is turned on continuously, and the switch tube Q2 and the switch tube Q3 are turned off.
4. The method for detecting the lossless input current of the power tube in the wireless charging transmitting terminal as claimed in claim 2, wherein the method for adjusting the switching timings of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 in the step (2) is as follows:
(21) the switching tube Q2 is conducted with the switching tube Q3, and the switching tube Q4 is closed with the switching tube Q1;
(22) the switch tube Q3 is turned off, the switch tube Q2 is turned on continuously, and the switch tube Q1 and the switch tube Q4 are turned off.
5. The method for detecting the lossless input current of the power tube in the wireless charging transmitting terminal according to any one of claims 2 to 4, wherein in the detected conduction currents of the two lower tubes of the switch tube Q2 and the switch tube Q4, the detection data of the dead zone phase of the H2L of the electrical connection point AC1 and the electrical connection point AC2 need to be shielded.
6. The method for detecting the lossless input current of the power tube in the wireless charging transmitting terminal according to claim 5, wherein the method for shielding the detection data of the dead zone phase of the H2L of the electrical connection point AC1 and the electrical connection point AC2 is as follows:
the dead zone phase detection data of the H2L of the electrical connection point AC1 and the electrical connection point AC2 are shielded by adjusting a detection window for detecting the conduction current of two lower tubes of the switching tube Q2 and the switching tube Q4.
7. The method for detecting the lossless input current of the power tube in the wireless charging transmitting terminal according to claim 1, wherein the circuit for detecting the conducting current of the two lower tubes of the switching tube Q2 and the switching tube Q4 comprises a switching tube P1, a switching tube P2, a switching tube P3, a switching tube P4, a switching tube N1, a switching tube N2, a switching tube Q5, a switching tube Q6, an operational amplifier OP1, an operational amplifier OP2, a sampling circuit AC1_ SAMPLE, a sampling circuit AC2_ SAMPLE;
the input end of the sampling circuit AC1_ SAMPLE is connected to the electrical connection point AC1, the output end is connected to the positive input end of the operational amplifier OP1, and the control end is used for inputting the detection window signal of the switching tube Q2; the negative input end of the operational amplifier OP1 is connected with the drain electrode of the switching tube Q5, and the output end is connected with the grid electrode of the switching tube N1; the grid electrode of the switching tube Q5 is connected with a control signal Tie _ h, and the source electrode is grounded; the source electrode of the switch tube N1 is connected with the drain electrode of the switch tube Q5, and the drain electrode of the switch tube N1 is simultaneously connected with the drain electrode and the grid electrode of the switch tube P1; the grid electrode of the switching tube P1 is connected with the grid electrode of the switching tube P2;
the input end of the sampling circuit AC2_ SAMPLE is connected to the electrical connection point AC2, the output end is connected to the positive input end of the operational amplifier OP2, and the control end is used for inputting the detection window signal of the switching tube Q4; the negative input end of the operational amplifier OP2 is connected with the drain electrode of the switching tube Q6, and the output end is connected with the grid electrode of the switching tube N2; the grid electrode of the switching tube Q6 is connected with a control signal Tie _ h, and the source electrode is grounded; the source electrode of the switch tube N2 is connected with the drain electrode of the switch tube Q6, and the drain electrode of the switch tube N2 is simultaneously connected with the drain electrode and the grid electrode of the switch tube P3; the grid electrode of the switching tube P3 is connected with the grid electrode of the switching tube P4;
the drain of the switching tube P2 and the drain of the switching tube P4 are both grounded through a resistor Rsns _ out; the source electrode of the switching tube P1, the source electrode of the switching tube P2, the source electrode of the switching tube P3 and the source electrode of the switching tube P4 are all connected with a power supply voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111586832.2A CN114355015A (en) | 2021-12-23 | 2021-12-23 | Nondestructive input current detection method for internal power tube of wireless charging transmitting terminal |
Applications Claiming Priority (1)
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