CN114649927A - Drive control panel of two-way benefit electricity - Google Patents
Drive control panel of two-way benefit electricity Download PDFInfo
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- CN114649927A CN114649927A CN202011511797.3A CN202011511797A CN114649927A CN 114649927 A CN114649927 A CN 114649927A CN 202011511797 A CN202011511797 A CN 202011511797A CN 114649927 A CN114649927 A CN 114649927A
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- 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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
Abstract
The utility model provides a drive control panel of two-way benefit electricity, includes first benefit electricity unit and second benefit electricity unit, its characterized in that: the first power supply unit and the second power supply unit are symmetrically arranged; the first power supply unit comprises a bootstrap voltage input unit, a power supply current generation unit and a power supply diode D1; the bootstrap voltage input unit collects voltage from a bootstrap capacitor and sends the voltage to the power supply current generation unit; the electricity supplementing current generating unit receives the voltage from the bootstrap capacitor and generates electricity supplementing current; the electricity supplementing diode D1 is used for supplementing electricity for the second electricity supplementing unit based on the electricity supplementing current. Based on the scheme of the invention, the drive control panel for bidirectional power compensation can be provided, and the bootstrap capacitor is charged through mutual power compensation of the first power compensation unit and the second power compensation unit.
Description
Technical Field
The invention relates to the field of integrated circuits, in particular to a drive control board for bidirectional power compensation.
Background
In the power management chip, a bootstrap capacitor circuit needs to be built for the high-side power tube, so as to ensure the switching action of the high-side power tube. During the operation of the BUCK-BOOST converter circuit, it is necessary to ensure that a high-side power tube can be in a conducting state for a long time. In order to ensure the long-term conduction of the high-side power tube, it is necessary to ensure that the bootstrap capacitor of the gate voltage of the high-side power tube is charged with sufficient electric quantity.
In the prior art, there are two ways to ensure that the bootstrap capacitor is charged with sufficient charge. The first method is to add refresh logic to the circuit, i.e. when the voltage of the bootstrap capacitor is lower than a certain threshold, turn off the high-side power tube and turn on the low-side power tube to supplement the power for the bootstrap capacitor. The problem of this method is that, at intervals, when the amount of electricity in the bootstrap capacitor is insufficient, the high-side power transistor that is originally turned on for a long time needs to be turned off and the low-side power transistor needs to be turned on to implement refreshing, and this operation may cause unnecessary jitter to occur in the output waveform, thereby affecting the quality of the output signal of the whole chip. The second method is to provide a charge pump module to continuously charge the bootstrap capacitor. The problem of this method is that an additional charge pump module needs to be added to the circuit, which increases the complexity of the circuit, and since the charge pump module has high frequency components, a high frequency signal is also introduced into the circuit, which affects the performance of the whole chip.
Therefore, a simple and accurate power compensation circuit is needed to overcome the shortcomings of the prior art and achieve the power compensation function.
Disclosure of Invention
In order to solve the defects in the prior art, an object of the present invention is to provide a driving control board for bidirectional power compensation, in which a bootstrap capacitor is charged by mutual power compensation of a first power compensation unit and a second power compensation unit.
The invention adopts the following technical scheme.
The utility model provides a drive control panel of two-way benefit electricity, includes first benefit electricity unit and second benefit electricity unit, its characterized in that: the first power supply unit and the second power supply unit are symmetrically arranged; the first power supply unit comprises a bootstrap voltage input unit, a power supply current generation unit and a power supply diode D1; the bootstrap voltage input unit collects voltage from the bootstrap capacitor and sends the voltage to the power supply current generation unit; the electricity supplementing current generating unit receives the voltage from the bootstrap capacitor and generates electricity supplementing current; and the electricity supplementing diode D1 is used for supplementing electricity for the second electricity supplementing unit based on the electricity supplementing current.
Preferably, the complementary current generating unit comprises an amplifier EA1, an NMOS tube and a mirror image unit; the amplifier EA1 has a negative phase input end connected with the bootstrap voltage input unit, a positive phase input end receiving a reference voltage, and an output end connected with the gate of the NMOS tube MR 1; the source electrode of the NMOS tube MR1 is grounded, and the drain electrode is connected with the mirror image unit; and the mirror image unit is respectively connected with the drain electrode of the NMOS tube MR1 and the anode of the diode.
Preferably, the mirroring unit includes a first NMOS transistor MP1 and a second NMOS transistor MP2 that are mirror-connected; the drain and the gate of the first NMOS transistor MP1 are connected with the drain of the NMOS transistor MR1 and the gate of the second NMOS transistor; the drain of the second NMOS transistor MP2 is connected to the anode of the diode D1; the sources of the first and second NMOS transistors MP1 and MP2 are connected.
Preferably, the cathode of the complementary diode D1 is connected to the sources of the third NMOS transistor MP3 and the fourth NMOS transistor MP4 in the mirror image unit in the second complementary unit.
Preferably, the source voltages of the first NMOS transistor MP1 and the second NMOS transistor MP2 are the first bootstrap voltage BST1, and the source voltages of the third NMOS transistor MP3 and the fourth NMOS transistor MP4 are the second bootstrap voltage BST 2.
Compared with the prior art, the bidirectional power compensation driving control board has the advantages that the structure is simple, the output is accurate, the bidirectional power compensation of the driving control board can be realized without additional refreshing logic or a charge pump module, and the large-amplitude jitter of output waveforms or the introduction of high-frequency noise signals cannot be caused in the power compensation process.
The beneficial effects of the invention also include:
1. the invention can reduce the voltage ripple of the bootstrap capacitors C1 and C2 through loop regulation, thereby reducing the change of the on-resistance of the high-side power tube.
2. According to the invention, the magnitude of the charging current output by the electricity supplementing diode is automatically adjusted according to the voltage drop of the bootstrap capacitor, so that the rapid electricity supplementing when the voltage of the bootstrap capacitor is lower, the slow electricity supplementing when the voltage of the bootstrap capacitor is higher and the stable state when the voltage of the bootstrap capacitor reaches the preset value are realized.
Drawings
FIG. 1 is a schematic diagram of a BUCK-BOOST converter for driving a control board according to the prior art;
FIG. 2 is a schematic circuit diagram of a bi-directional power compensation driving control board according to the present invention;
fig. 3 is a schematic diagram of the change of the compensation current generated in the driving control board for bidirectional compensation according to the present invention with time.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
FIG. 1 is a schematic diagram of a BUCK-BOOST converter for driving a control board according to the prior art. As shown in fig. 1, the BUCK-BOOST converter includes four switching MOS transistors. Two switch MOS pipes MH1 and MH2 are high-side power pipes, drain electrodes are respectively connected with an input voltage end and an output voltage end, source electrodes are connected to two ends of the inductance coils SW1 and SW2, and a grid electrode and a source electrode are respectively connected with bootstrap capacitors C1 and C2 in parallel and a high-side driving level. The other two switching MOS transistors ML1 and ML2 are low-side power transistors, the drains are connected to two ends of the inductors SW1 and SW2 respectively, the sources are grounded, and the gates are connected to a low-side driving level. The HDR1, HDR2, LDR1, LDR2 in the circuit are gate drive signals of four switching tubes MH1, MH2, ML1 and ML2, respectively.
Fig. 2 is a circuit diagram of a driving control board for bidirectional power compensation according to the present invention. As shown in fig. 2, a driving control board for bidirectional power compensation includes a first power compensation unit and a second power compensation unit. The first power supply unit and the second power supply unit are symmetrically arranged; the first power supply unit comprises a bootstrap voltage input unit, a power supply current generation unit and a power supply diode D1; the bootstrap voltage input unit collects voltage from the bootstrap capacitor and sends the voltage to the power supply current generation unit; the electricity supplementing current generating unit receives the voltage from the bootstrap capacitor and generates electricity supplementing current; and the electricity supplementing diode D1 is used for supplementing electricity for the second electricity supplementing unit based on the electricity supplementing current.
It can be understood that the first power supply unit receives the input voltage of the bootstrap capacitor, compares the input voltage with the reference voltage, divides the input voltage into two cases that the input voltage of the bootstrap capacitor is higher than the reference voltage and the input voltage of the bootstrap capacitor is lower than the reference voltage, and then generates the current of the diode, i.e. the power supply current, according to the determination of the above cases. The complementary diode D1 is connected to the second complementary unit to increase the bootstrap voltage BST 2. Since the first power supply unit and the second power supply unit are symmetrically cross-connected in the bidirectional power supply circuit, the power supply diode D2 in the second power supply unit can also supply power to the first power supply unit in the same manner.
Preferably, the complementary current generation unit comprises an amplifier EA1, an NMOS tube and a mirror image unit; the amplifier EA1 has a negative phase input end connected with the bootstrap voltage input unit, a positive phase input end receiving a reference voltage, and an output end connected with the gate of the NMOS tube MR 1; the source electrode of the NMOS tube MR1 is grounded, and the drain electrode is connected with the mirror image unit; and the mirror image unit is respectively connected with the drain electrode of the NMOS tube MR1 and the anode of the diode.
Preferably, the mirror unit includes a first PMOS transistor MP1 and a second PMOS transistor MP2 connected in a mirror manner; the drain and the gate of the first PMOS tube MP1 are connected with the drain of the NMOS tube MR1 and the gate of the second PMOS tube; the drain of the second PMOS transistor MP2 is connected to the anode of the diode D1; the sources of the first and second PMOS transistors MP1 and MP2 are connected.
Preferably, the cathode of the complementary diode D1 is connected to the sources of the third PMOS transistor MP3 and the fourth PMOS transistor MP4 in the mirror image unit in the second complementary unit.
Preferably, the source voltages of the first PMOS transistor MP1 and the second PMOS transistor MP2 are the first bootstrap voltage BST1, and the source voltages of the third PMOS transistor MP3 and the fourth PMOS transistor MP4 are the second bootstrap voltage BST 2.
Specifically, the input of the negative input terminal of the amplifier is the voltage from the bootstrap capacitor C2 where the first bootstrap voltage BST2 port is located. Assuming that the high-side power transistor MH2 at the port of the second bootstrap voltage BST2 is in a long-term conducting state at this time, the error amplifier EA1 may calculate the voltage drop VC2 from the bootstrap capacitor C2, and compare the voltage drop with the reference voltage Vref as a reference, so as to adjust the gate voltage of the MOS transistor MR1 according to the difference between the two voltages.
Fig. 3 is a schematic diagram of the change of the compensation current generated in the driving control board for bidirectional compensation according to the present invention with time. As shown in fig. 3, during the time period from t1 to t2, the MOS transistor in which BST1 is located is in a conducting state, and BST1 is at a high voltage. At this time, when the voltage drop VC2 from the bootstrap capacitor C2 is lower than the preset regulation value Vreg, EA1 may control the MOS transistor MR1 to generate a complementary current, and the complementary current flows into the complementary diode D1 through a current mirror formed by two MOS transistors.
It should be noted that the preset adjustment value Vreg is obtained according to the reference voltage Vref, and there is usually Vreg — k × Vref, where k is a scaling factor. In an embodiment of the present invention, k is 1. In practical applications, the scaling factor k may be given different constant values. When the scaling factor is not 1, the input of the negative input terminal of the error amplifier EA1 can be adjusted to be
The voltage output by the output terminal of the error amplifier EA1 is Vout — a (Vp-Vn), where a is the gain of the error amplifier EA1, Vp is the positive phase input terminal voltage, and Vn is the negative phase input terminal voltage.
In the time period from t1 to t2, the voltage at the BST1 port is higher than that at the BST2, so the power supply diode is powered by the BST2 port in the second power supply unit with forward current. Since the compensation diode D1 is continuously compensated for BST2 at this time, the bootstrap capacitor C2 is in a charging state, and thus the voltage drop VC2 from the bootstrap capacitor C2 gradually rises and is maintained at Vreg.
When the time period t2 is reached, the MOS transistor in which the BST1 is located is turned off, at this time, the voltage at the port BST1 is low, the complementary diode D1 is turned off, the bootstrap capacitor C2 cannot be complemented, so the voltage drop VC2 from the bootstrap capacitor C2 gradually drops due to self consumption, until the MOS transistor in which the BST1 is located is turned on again at time t3, the voltage drop VC2 from the bootstrap capacitor C2 gradually rises and returns to Vreg, and the power complementing process is repeated.
With the repeated off and on states of the MOS transistor in which the BST1 is located, the circuit continuously supplies power to the bootstrap capacitor C2. Similarly, when the high-side power transistor MH1 at the port of the first bootstrap voltage BST1 is in a long-term on state, the circuit will continuously supply power to the bootstrap capacitor C1 along with the on and off states of the MH 2. Therefore, the bidirectional power supplementing function of the circuit is realized.
In the above process, the current of the complementary diode D1 changes in a stepwise manner according to the voltage difference between the voltage drop VC2 from the bootstrap capacitor C2 and the preset regulation value Vreg. And the power supply speed is different in different time periods according to the change of the step current.
Compared with the prior art, the bidirectional power compensation driving control board has the advantages that the structure is simple, the output is accurate, the bidirectional power compensation of the driving control board can be realized without additional refreshing logic or charge pump modules, and the large-amplitude jitter of output waveforms or the introduction of high-frequency noise signals cannot be caused in the power compensation process.
The beneficial effects of the invention also include:
1. according to the invention, output ripples caused by voltage difference of bootstrap capacitors C1 and C3 in different voltage states can be reduced through loop regulation, so that the change of the on-resistance of a high-side power tube is reduced.
2. According to the invention, the magnitude of the charging current output by the electricity supplementing diode is automatically adjusted according to the voltage drop of the bootstrap capacitor, so that the rapid electricity supplementing when the voltage of the bootstrap capacitor is lower, the slow electricity supplementing when the voltage of the bootstrap capacitor is higher and the stable state when the voltage of the bootstrap capacitor reaches the preset value are realized.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (5)
1. The utility model provides a drive control panel of two-way benefit electricity, includes first benefit electricity unit and second benefit electricity unit, its characterized in that:
the first power supply unit and the second power supply unit are symmetrically arranged; and the number of the first and second electrodes,
the first power supply unit comprises a bootstrap voltage input unit, a power supply current generation unit and a power supply diode D1; wherein the content of the first and second substances,
the bootstrap voltage input unit is used for acquiring voltage from a bootstrap capacitor and sending the voltage to the power supply current generation unit;
the electricity supplementing current generating unit receives the voltage from the bootstrap capacitor and generates electricity supplementing current;
and the electricity supplementing diode D1 is used for supplementing electricity for the second electricity supplementing unit based on the electricity supplementing current.
2. The drive control board for bidirectional power compensation as recited in claim 1, wherein:
the complementary current generating unit comprises an amplifier EA1, an NMOS tube and a mirror image unit; wherein the content of the first and second substances,
the negative phase input end of the amplifier EA1 is connected with the bootstrap voltage input unit, the positive phase input end of the amplifier EA1 receives a reference voltage, and the output end of the amplifier EA1 is connected with the grid electrode of the NMOS tube MR 1;
the source electrode of the NMOS tube MR1 is grounded, and the drain electrode is connected with the mirror image unit;
and the mirror image unit is respectively connected with the drain electrode of the NMOS tube MR1 and the anode of the diode.
3. The drive control board for bidirectional power compensation as recited in claim 2, wherein:
the mirror unit comprises a first NMOS transistor MP1 and a second NMOS transistor MP2 which are connected in a mirror mode; wherein the content of the first and second substances,
the drain and the gate of the first NMOS tube MP1 are connected with the drain of the NMOS tube MR1 and the gate of the second NMOS tube;
the drain of the second NMOS transistor MP2 is connected to the anode of the diode D1;
the sources of the first and second NMOS transistors MP1 and MP2 are connected.
4. A bi-directional power-compensating drive control board as claimed in claim 3, wherein:
the cathode of the complementary diode D1 is connected to the sources of the third NMOS transistor MP3 and the fourth NMOS transistor MP4 in the mirror image unit of the second complementary unit.
5. The drive control board for bidirectional power compensation as recited in claim 4, wherein:
the source voltages of the first PMOS transistor MP1 and the second PMOS transistor MP2 are first bootstrap voltages BST1, and the source voltages of the third PMOS transistor MP3 and the fourth PMOS transistor MP4 are second bootstrap voltages BST 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011511797.3A CN114649927A (en) | 2020-12-18 | 2020-12-18 | Drive control panel of two-way benefit electricity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011511797.3A CN114649927A (en) | 2020-12-18 | 2020-12-18 | Drive control panel of two-way benefit electricity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114649927A true CN114649927A (en) | 2022-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011511797.3A Pending CN114649927A (en) | 2020-12-18 | 2020-12-18 | Drive control panel of two-way benefit electricity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114649927A (en) |
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2020
- 2020-12-18 CN CN202011511797.3A patent/CN114649927A/en active Pending
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