CN112134548B - Driving device, control method thereof and electronic equipment - Google Patents
Driving device, control method thereof and electronic equipment Download PDFInfo
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- CN112134548B CN112134548B CN202010846579.9A CN202010846579A CN112134548B CN 112134548 B CN112134548 B CN 112134548B CN 202010846579 A CN202010846579 A CN 202010846579A CN 112134548 B CN112134548 B CN 112134548B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
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Abstract
The application discloses a drive arrangement for driving a power output circuit, drive circuit includes a drive circuit, and power output circuit includes a first power tube, and a drive circuit is used for providing a first grid voltage to a first power tube in order to control the switching on or off of a first power tube. The first driving circuit comprises a discharging module, a voltage detection module and a voltage source. When the first grid voltage is larger than the first voltage, the voltage detection module controls the discharge module to discharge the first grid voltage to the ground. When the first grid voltage reaches the first voltage, the voltage detection module controls the discharge module to enable the first grid voltage to discharge the discharge end of the voltage source. The application also discloses a control method of the driving device and electronic equipment. The method has lower cost.
Description
Technical Field
The present disclosure relates to electronics, and more particularly, to a driving apparatus, a control method thereof, and an electronic device.
Background
Today, more and more product applications require class D power amplifiers and motor driven power chips to have high voltage driving capability, provide large output power, and typically require device operating voltages above 10V. While high-performance, low on-resistance high-voltage devices typically employ thin gate oxide process devices, the normal operating voltage of their gates is typically required to be in the low voltage (about 5V) range. In the prior art, a high-power signal needs to be output by an upper power tube (PMOS field effect transistor), and the gate capacitance is larger, so that the transient current is larger when the gate discharges. To meet the requirement of transient high current when the upper power tube discharges, a current source with an off-chip capacitor is generally used to provide a large transient current absorbing capability. However, the use of off-chip capacitors results in a larger chip layout area and higher chip cost.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a driving device, a control method thereof, and an electronic apparatus, which are low in cost.
One aspect of the present application provides a driving device for driving a power output circuit, the driving device including a first driving circuit, the power output circuit including a first power tube, the first driving circuit being configured to provide a first gate voltage to a gate of the first power tube to control on or off of the first power tube; the first driving circuit includes:
the voltage source comprises a discharge end, wherein the discharge end is used for providing a discharge voltage;
the discharge module is connected with the grid electrode of the first power tube, the voltage source and the ground, and the first grid voltage can selectively discharge the discharge end of the voltage source or discharge the ground through the discharge module;
the voltage detection module is used for detecting the first grid voltage and controlling the discharge module according to the detected magnitude of the first grid voltage so as to selectively discharge the grid of the first power tube, wherein the voltage detection module is used for controlling the discharge module to discharge the first grid voltage to the ground when the first grid voltage is larger than the first voltage, and controlling the discharge module to discharge the first grid voltage to the discharge end of the voltage source when the first grid voltage reaches the first voltage, and the first voltage is larger than the discharge voltage.
In some embodiments, the first power tube is a PMOS field effect transistor, the first driving circuit is connected to a gate of the first power tube, a power supply voltage is connected to a source of the first power tube, a drain of the first power tube is connected to an external load, and when the first power tube is turned on, the power supply voltage charges the external load through the turned-on first power tube.
In some embodiments, the voltage detection module detects the first gate voltage, outputs a detection signal having a first level to the discharge module when the first gate voltage is greater than a first voltage, and outputs a detection signal having a second level when the first gate voltage is less than or equal to the first voltage; the discharging module controls the first grid voltage to discharge to the ground according to the detection signal with the first level, and controls the first grid voltage to discharge to the discharging end of the voltage source according to the detection signal with the second level.
In certain embodiments, the discharge module comprises: a switching circuit through which a power supply voltage charges or discharges a gate of a first power tube to provide the first gate voltage to the gate of the first power tube; and the voltage control module is used for controlling the switching circuit according to the detection signal so that when the first grid voltage is discharged to the first voltage to the ground, the first grid voltage is switched from the discharge to the discharge end of the voltage source.
In some embodiments, the switching circuit includes a first switching tube, a second switching tube, and a third switching tube, the first switching tube includes a control terminal connected to the voltage control module, a first conduction terminal connected to a power supply voltage, and a second conduction terminal connected to a gate of the first switching tube, the voltage control module provides a first control voltage to the control terminal of the first switching tube to control on or off between the first conduction terminal and the second conduction terminal of the first switching tube, the gate of the first switching tube is charged when the first switching tube is turned on, the second switching tube includes a control terminal connected to the voltage control module, a first conduction terminal connected to ground, and a second conduction terminal connected to the gate of the first switching tube, the voltage control module provides a second control voltage to the control terminal of the second switching tube to control on or off between the first conduction terminal and the second conduction terminal of the first switching tube, and the second switching tube provides a discharge voltage to the control terminal of the first switching tube through the first conduction terminal and the second conduction terminal of the first switching tube when the first switching tube is turned on.
In some embodiments, when the power supply voltage charges the gate of the first power tube, the first switch tube is turned on, the second switch tube is turned off, and the third switch tube is turned off; when the grid electrode of the first power tube discharges to the ground, the first switching tube is turned off, the second switching tube is turned on, and the third switching tube is turned off; when the grid electrode of the first power tube discharges the discharge end of the voltage source, the second switching tube is turned off, and the third switching tube is turned on.
In some embodiments, the driving circuit further includes a second driving circuit, the power output circuit further includes a second power tube, the second power tube is an NMOS power tube, the second driving circuit is configured to provide a second gate voltage to a gate of the second power tube to control on or off of the second power tube, the second driving circuit is connected to the gate of the second power tube, a drain of the second power tube and a drain of the first power tube are commonly connected to an external load, a source of the second power tube is connected to ground, and when the second power tube is turned on, the first power tube is turned off, and the external load discharges via the turned on second power tube.
In some embodiments, the second driving circuit and the first driving circuit are identical in structure.
In some embodiments, the driving circuit further includes a dead time control module, where the dead time control module is configured to receive the first gate voltage and the second gate voltage, and provide a first adjustment signal to the first driving circuit and a second adjustment signal to the second driving circuit, so as to control the first power tube and the second power tube to be alternately turned on.
In some embodiments, the first voltage and the discharge voltage differ by no more than 1V.
One aspect of the present application provides a control method of a driving device, including:
providing a first driving circuit, wherein the first driving circuit comprises a voltage source, the voltage source comprises a discharge end, the discharge end is used for providing a discharge voltage, and the first driving circuit is used for providing a first grid voltage to a first power tube so as to control the on or off of the first power tube;
when the first grid voltage is larger than the first voltage, the grid of the first power tube is connected with the ground and discharges to the ground;
when the first grid voltage is reduced to a first voltage, the grid electrode of the first power tube is connected with the discharge end to discharge the discharge end, and the first voltage is larger than the discharge voltage of the discharge end.
In some embodiments, the first driving circuit further comprises a discharge module and a voltage detection module; when the first grid voltage is larger than the first voltage, the grid of the first power tube is connected with the ground, and the discharging to the ground comprises the following steps: the voltage detection module outputs a detection signal of a first level to the discharge module so that the first grid voltage is discharged to the ground through the discharge module; when the first grid voltage is reduced to a first voltage, the grid electrode of the first power tube is connected with the discharge end to discharge the discharge end, and the first voltage is larger than the discharge voltage of the discharge end and comprises the following components: the voltage detection module outputs a detection signal of a second level to the discharge module so that the first grid voltage discharges the discharge end of the voltage source through the discharge module.
In some embodiments, the discharge module includes a switching circuit including a first switching tube, a second switching tube, and a third switching tube, and a voltage control module; the discharging of the first gate voltage to ground through the discharging module includes: the voltage control module receives the detection signal of the first level and controls the second switching tube to be conducted, the first grid voltage discharges to the ground through the conducted second switching tube, and the first grid voltage is reduced.
In some embodiments, the discharging of the discharge voltage by the discharge module by the first gate voltage includes: the voltage control module receives the detection signal of the second level and controls the third switching tube to be conducted, and the first grid voltage discharges the discharge voltage through the conducted third switching tube.
One aspect of the present application provides an electronic device including a driving circuit, a power output circuit, and a load, the driving circuit being configured to drive the power output circuit to provide a load voltage to the load, wherein the driving circuit is configured to drive the driving circuit.
The beneficial effects of this application lie in, first drive circuit includes voltage source, voltage detection module, voltage control module and switch circuit, can with first grid voltage discharging's process divide into to the ground discharge stage and to the stage that the discharge end of voltage source discharged, and just pass through discharging when first grid voltage size is close to the discharge voltage, therefore first drive circuit need not set up extra off-chip electric capacity, only need the less on-chip electric capacity of integrated electric capacity can, thereby the drive circuit of this application and drive method and electronic equipment can save the cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit schematic of one embodiment of a drive circuit of the present application;
FIG. 2 is a schematic diagram of a portion of the circuit structure of the driving circuit shown in FIG. 1;
FIG. 3 is a partial signal timing diagram of one embodiment of the drive circuit of FIG. 2;
FIG. 4 is a partial signal timing diagram of another embodiment of the driving circuit of FIG. 2;
fig. 5 is a partial flow diagram of one embodiment of a control method of a driving apparatus of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. The various embodiments described below and their technical features can be combined with each other without conflict.
Referring to fig. 1, a schematic circuit diagram of a driving device 10 of the present application is shown. For example, but not limited to, the driving apparatus 10 may be applied to a class D audio power amplifier circuit. The driving device 10 may receive a pulse width modulation signal PWM from an external pulse width modulation circuit (not shown) and output a corresponding voltage driving signal to a power output circuit 20. The power output circuit 20 outputs a load voltage VOUT to an external load (not shown) driven by the driving device 10.
The power output circuit 20 includes a first power tube PM2 and a second power tube NM2. For convenience of description, the first power transistor PM2 is a PMOS field effect transistor, and the second power transistor NM2 is an NMOS field effect transistor in the embodiment of the present application by way of example and not limitation. However, this is not a limitation of the embodiments of the present application, and those skilled in the art will understand that other types of transistors or high-voltage devices may be used for the first power tube PM2 and the second power tube NM2.
The driving device 10 includes a first driving circuit 11, a second driving circuit 12, and a dead time control module 13. The first driving circuit 11 is configured to provide a first gate voltage hs_gt2 to the first power tube PM2 to control on or off of the first power tube PM 2. The second driving circuit 12 is configured to provide a second gate voltage ls_gt2 to the second power transistor NM2 to control on or off of the second power transistor NM2. In some embodiments, the first power tube PM2 may be referred to as an upper-end power tube, and the second power tube NM2 may be referred to as a lower-end power tube.
The first driving circuit 11 is connected to a gate (not numbered) of the first power tube PM2, a power supply voltage PVDD is connected to a source (not numbered) of the first power tube PM2, and a drain (not numbered) of the first power tube PM2 is connected to an external load. When the first power tube PM2 is turned on, the power supply voltage PVDD charges the external load via the turned-on first power tube PM 2.
The second driving circuit 12 is connected to a gate (not numbered) of the second power tube NM2, an external load is connected to a drain (not numbered) of the second power tube NM2, and a source (not numbered) of the second power tube NM2 is connected to the ground PGND. When the second power tube NM2 is conducted, the external load discharges through the conducted second power tube NM2.
The dead time control module 13 is configured to provide a first adjustment signal dt_hs2 to the first driving circuit 11 and a second adjustment signal dt_ls2 to the second driving circuit 12, so that the first driving circuit 11 and the second driving circuit 12 do not control the first power tube PM2 and the second power tube NM2 to be turned on simultaneously, i.e. the dead time control module 13 controls the first power tube PM2 and the second power tube NM2 to be turned on alternately through the first driving circuit 11 and the second driving circuit 12, respectively.
The dead time control module 13 is capable of detecting a first gate voltage hs_gt2 supplied to the gate of the first power tube PM2 and a second gate voltage ls_gt2 supplied to the gate of the second power tube NM2, and outputting a corresponding first adjustment signal dt_hs2 to the first driving circuit 11 and a second adjustment signal dt_ls2 to the second driving circuit 12 according to the detected first gate voltage hs_gt2 and second gate voltage ls_gt2 such that the first power tube PM2 and the second power tube NM2 are not simultaneously turned on.
The node where the drain of the first power tube PM2 and the drain of the second power tube NM2 are located may be regarded as an output terminal of the power output circuit 20, for outputting the load voltage VOUT to an external load.
In the embodiment shown in fig. 1, the first driving circuit 11 includes a voltage source 101, a discharging module 102, and a voltage detecting module 112. The voltage source 101 includes a discharging terminal (not numbered) for providing a discharging voltage vss_reg2. The discharging module 102 is connected to the discharging end, the first power tube PM2, and the ground PGND. The first gate voltage hs_gt2 can selectively discharge the discharge terminal of the voltage source 101 or the ground PGND through the discharge module 102. The voltage detection module 112 connects the discharge module 102 and the gate of the first power tube PM 2. The voltage detection module 112 is configured to detect the first gate voltage hs_gt2 and control the discharge module 102 according to the detected magnitude of the first gate voltage hs_gt2 to selectively discharge the first gate voltage hs_gt2. The voltage detection module 112 is configured to control the discharge module 102 to discharge the first gate voltage hs_gt2 to the ground PGND when the first gate voltage hs_gt2 is greater than a first voltage, and control the discharge module 102 to discharge the first gate voltage hs_gt2 to the discharge terminal when the first gate voltage hs_gt2 drops to the first voltage. By way of example and not limitation, the first voltage is greater than the discharging voltage vss_reg2, and a difference between the first voltage and the discharging voltage vss_reg2 is not greater than 1V.
Alternatively, in some embodiments, the first power transistor PM2 may be a PMOS field effect transistor. The first driving circuit 11 is connected to the gate of the first power tube PM2, the power supply voltage PVDD is connected to the source of the first power tube PM2, and the drain of the first power tube PM2 is connected to an external load. When the first power tube PM2 is turned on, the power supply voltage PVDD charges the external load via the turned-on first power tube PM 2.
Optionally, in some embodiments, the voltage detection module 112 outputs a detection signal hsgt_sns having a first level to the discharge module 102 when the first gate voltage hs_gt2 is greater than a first voltage, and outputs a detection signal hsgt_sns having a second level to the discharge module 102 when the first gate voltage hs_gt2 is less than or equal to the first voltage.
The discharging module 102 controls the first gate voltage hs_gt2 to discharge the ground PGND according to the detection signal hsgt_sns having the first level. The discharging module 102 controls the first gate voltage hs_gt2 to discharge the discharging voltage vss_reg2 according to the detecting signal hsgt_sns having the second level. The first level is a low level, and the second level is a high level; or the first level is a high level and the second level is a low level.
The voltage source 101 comprises a discharge terminal (not numbered) and a capacitor Cvss2. The voltage source 101 receives a power supply voltage PVDD and outputs the discharging voltage vss_reg2 at a discharging terminal. The discharge end of the voltage source 101 has a current sinking capability. For example, but not limited to, the discharging voltage vss_reg2=pvdd-VT, VT may represent a voltage value less than 6V, such as vt=5v. The power supply voltage PVDD may be about 10V. The capacitance Cvss2 is an on-chip capacitance, which may have a capacitance value of 0 to 10pF.
Referring to fig. 2, a schematic diagram of a partial circuit structure of an embodiment of the driving circuit 10 of the present application is shown, and the circuit structure of the first driving circuit 11 is specifically shown. The discharging module 102 includes a voltage control module 111 and a switching circuit 113. The voltage control module 111 is configured to control the switching circuit 113 such that the gate of the first power tube PM2 can selectively discharge PGND to ground or the discharge voltage vss_reg2. The voltage detection module 112 is configured to detect a first gate voltage hs_gt2 provided to the gate of the first power tube PM2, and when the magnitude of the first gate voltage hs_gt2 reaches the first voltage, control the voltage control module 111 and the switch circuit 113 so that the gate of the first power tube PM2 becomes discharged to the discharge end of the voltage source 101. Alternatively, in some embodiments, the voltage source 101 may be a linear regulator integrated on-chip capacitor. The magnitude of the first voltage may be greater than the magnitude of the discharging voltage vss_reg2, for example, but not limited to, a difference between the first voltage and the discharging voltage vss_reg2 is less than or equal to 1V.
The switching circuit 113 includes a first switching tube Q1, a second switching tube Q2, and a third switching tube Q3. The first switching tube Q1 includes a control terminal (not numbered) connected to the voltage control module 111, a first conductive terminal (not numbered) connected to the power supply voltage PVDD, and a second conductive terminal (not numbered) connected to the gate of the first power tube PM 2. The voltage control module 111 provides a first control voltage V1 to the control terminal of the first switching tube Q1 to control on or off between the first conductive terminal and the second conductive terminal of the first switching tube Q1. When the first switching tube Q1 is turned on, the gate of the first power tube PM2 is charged.
The second switching tube Q2 includes a control terminal (not numbered) connected to the voltage control module 111, a first conductive terminal (not numbered) connected to the ground PGND, and a second conductive terminal (not numbered) connected to the gate of the first power tube PM 2. The voltage control module 111 provides a second control voltage V2 to the control terminal of the second switching tube Q2 to control on or off between the first conductive terminal and the second conductive terminal of the second switching tube Q2. When the second switching tube Q2 is turned on, the gate of the first power tube PM2 discharges to the ground PGND through the turned-on second switching tube Q2.
The third switching tube Q3 includes a control terminal (not numbered) connected to the voltage control module 111, a first conductive terminal (not numbered) connected to a discharge terminal of the voltage source 101, and a second conductive terminal (not numbered) connected to a gate of the first power tube PM 2. The voltage control module 111 provides a third control voltage V3 to the control terminal of the third switching tube Q3 to control on or off between the first conductive terminal and the second conductive terminal of the third switching tube Q3. When the third switching tube Q3 is turned on, the gate of the first power tube PM2 is discharged to the discharge end of the voltage source 101 through the turned-on third switching tube Q3.
The voltage detection module 112 includes an input terminal connected to the gate of the first power tube PM2 and an output terminal connected to the voltage control module 111. The voltage detection module 112 is configured to detect the first gate voltage hs_gt2, and output a corresponding detection signal hsgt_sns to the voltage control module 111 according to the first gate voltage hs_gt2, so that the voltage control module 111 controls the first switching tube Q1, the second switching tube Q2, and the third switching tube Q3 to be turned on or off.
It should be noted that, the first switching tube Q1, the second switching tube Q2, and the third switching tube Q3 are described above, wherein the control terminal is, for example, but not limited to, a gate, the first conducting terminal is, for example, but not limited to, a source, and the second conducting terminal is, for example, but not limited to, a drain. Alternatively, the first switching transistor Q1 may be a PMOS field effect transistor, the second switching transistor Q2 may be an NMOS field effect transistor, and the third switching transistor Q3 may be an NMOS field effect transistor.
In addition, the first adjustment signal dt_hs2 outputted from the dead time control block 13 is applied to the voltage control block 111. The voltage control module 111 also receives a pulse width modulation signal PWM provided by an external pulse width signal modulation circuit. And may output the first, second and third control voltages V1, V2 and V3 according to the received pulse width modulation signal PWM, the detection signal hsgt_sns, and the first modulation signal dt_hs2.
The second driving circuit 12 may have substantially the same circuit configuration as the first driving circuit 11. For example, but not limited to, the second driving circuit 12 may include a plurality of switching transistors (PMOS field effect transistors and/or NMOS field effect transistors) and a voltage control module, and the voltage control module controls the switching transistors to be turned on or off, so as to change the magnitude of the second gate voltage ls_gt2 provided to the gate of the second power transistor NM2, and thus control the second power transistor NM2 to be turned on or off. Of course, it should be understood that the second driving circuit 12 and the first driving circuit 11 may have the same or different circuit structures, and it is within the scope of protection of the present application as long as the second driving circuit 12 can provide the second gate voltage ls_gt2 to control the second power tube NM2 to be turned on or off.
Referring to fig. 3, a partial signal timing diagram of an embodiment of the driving apparatus 10 is shown. Wherein:
at time t0, the PWM signal PWM is low, the second gate voltage ls_gt2 is high, and the first gate voltage hs_gt2 is high. The first adjustment signal dt_hs2 is low. The first driving voltage V1, the second driving voltage V2, and the third driving voltage V3 are low. The load voltage VOUT is low. At this time, the first switching tube Q1 is turned on, the second switching tube Q2 is turned off, and the third switching tube Q3 is turned off. Alternatively, at time t0, the magnitude of the first gate voltage hs_gt2 may be the magnitude of the power supply voltage PVDD.
At time t1, the pulse width modulation signal PWM changes from low level to high level. The second gate voltage ls_gt2 outputted from the second driving circuit 12 starts to become smaller.
Between times t1 and t2, the second gate voltage ls_gt2 becomes lower and reaches a first threshold voltage, alternatively, the first threshold voltage may be a voltage of the ground PGND, or the first threshold voltage may be a turn-on voltage of the second power transistor NM2 (may also be referred to as a turn-on threshold voltage of the second power transistor PM 2) or not more. That is, before time t2, the second power tube NM2 is turned off.
At time t2, the dead time control module 13 receives the second gate voltage ls_gt2 with the first threshold voltage and after a preset delay time, the first adjustment signal dt_hs2 output by the dead time control module 13 changes from low level to high level.
After the voltage control module 111 receives the first adjustment signal dt_hs2 with a high level, the first control voltage V1 provided to the first switching tube Q1 changes from a low level to a high level, and the second control voltage V2 provided to the second switching tube Q2 changes from a low level to a high level between time t2 and time t 3. The first gate voltage hs_gt2 becomes gradually smaller. At this time, the first switching tube Q1 is turned off, the second switching tube Q2 is turned on, and the third switching tube Q3 is kept turned off. The gate of the first power tube PM2 discharges to the ground via the turned-on second switching tube Q2, so that the first gate voltage hs_gt2 gradually becomes smaller.
At time t3, the first gate voltage hs_gt2 gradually decreases to reach the turn-on voltage of the first power tube PM2 (may also be referred to as the turn-on threshold voltage of the first power tube PM 2), the first power tube PM2 is turned on, the power supply voltage PVDD starts to charge the external load via the turned-on first power tube PM2, and the load voltage VOUT starts to increase.
The magnitude of the first gate voltage hs_gt2 is maintained substantially at the magnitude of the turn-on voltage of the first power tube PM2 between time t3 and time t4, and the load voltage VOUT is gradually increased.
At time t4, the load voltage VOUT reaches the supply voltage PVDD.
Between time t4 and time t5, the power supply voltage PVDD no longer charges the external load through the first power tube PM2, and no charging current flows through the first power tube PM 2. The gate of the first power tube PM2 continues to discharge via the turned-on second switching tube Q2, so that the first gate voltage hs_gt2 continues to gradually decrease.
At time t5, the magnitude of the first gate voltage hs_gt2 becomes PVDD-VT2, wherein VT2 represents a value slightly less than or equal to VT. Such as, but not limited to, vt=5v, vt2=4.5v to 5V. PVDD-VT2 is defined as a first voltage, and the first voltage is larger than the discharging voltage VSS_REG2, and the difference between the first voltage and the discharging voltage is not larger than 1V.
At this time, the voltage detection module 112 detects that the magnitude of the first gate voltage hs_gt2 becomes the first voltage (PVDD-VT 2), and the detection signal hsgt_sns outputted from the voltage detection module 112 changes from the low level to the high level. The detection signal hsgt_sns may be a logic level signal. The voltage control module 111 receives the high level detection signal hsgt_sns, and then outputs a third control voltage V3 from low level to high level and a second control voltage V2 from high level to low level. So that the third switching tube Q3 is turned on and the second switching tube Q2 is turned off.
After time t5, the gate of the first power tube PM2 is discharged via the turned-on third switching tube Q3, and the first gate voltage hs_gt2 continues to gradually decrease until reaching the magnitude of the discharge voltage vss_reg2.
In the above-mentioned operation flow of the driving apparatus 10, when the voltage of the first gate voltage hs_gt2 supplied to the gate of the first power transistor PM2 is already very close to (PVDD-VT) value, the voltage control module 111 is controlled by the voltage detection module 112 to turn off the second switching transistor Q2 and turn on the third transistor Q3, so that the magnitude of the first gate voltage hs_gt2 and the magnitude of the discharging voltage vss_reg2 are close to or equal to each other when the gate of the first power transistor PM2 is discharged through the third switching transistor Q3. Therefore, the first driving circuit 110 does not need the voltage source 101 to provide a large pull-down current at this time. Therefore, the driving device 10 or the electronic apparatus including the driving device 10 does not need to set a large-capacity off-chip capacitor, but only needs to set an on-chip capacitor Cvss2 with a smaller capacitance.
Referring to fig. 4, a partial signal timing diagram of another embodiment of the driving apparatus 10 is shown. Wherein:
at time t6, the PWM signal is at a high level, the first control voltage V1, the second control voltage V2, and the third control voltage V3 are at a high level, the first gate voltage hs_gt2 is at a low level, the second adjustment signal dt_ls2 is at a low level, the second gate voltage ls_gt2 is at a low level, and the load voltage VOUT is a power supply voltage PVDD. At this time, the first power tube PM2 is fully turned on. The first switching tube Q1 is turned off, and the second switching tube Q2 and the third switching tube Q3 are turned on. At this time, the first gate voltage hs_gt2 may have a magnitude of the discharging voltage vss_reg2.
At time t7, the pulse width modulation signal PWM changes from high level to low level, the voltage control module 111 controls the first control voltage V1, the second control voltage V2, and the third control voltage V3 to change from high level to low level, the first switching tube Q1 is turned on, and the second switching tube Q2 and the third switching tube Q3 are turned off.
Between time t7 and time t8, the power supply voltage PVDD charges the gate of the first power tube PM2 through the turned-on first switching tube Q1, and the first gate voltage hs_gt2 gradually increases.
At time t8, the first gate voltage hs_gt2 becomes the power supply voltage PVDD, and the first power transistor PM2 is turned off.
At time t9, the dead time control module 13 outputs the high level second adjustment signal dt_ls2 to the second driving circuit 12 after a predetermined delay time (time t8 to time t 9).
The second driving circuit 12 receives the second adjustment signal dt_ls2 of the high level and controls the output second gate voltage ls_gt2 to gradually increase from the low level between time t9 and time t 10.
At time t10, the second gate voltage ls_gt2 reaches the conducting voltage of the second power tube NM2, the second power tube NM2 is conducted, and the external load discharges through the conducted second power tube NM2.
The load voltage VOUT gradually decreases between time t10 and time t 11.
At time t11, the load voltage VOUT becomes the voltage of the ground PGND, and the second gate voltage ls_gt2 outputted from the second driving circuit 12 continues to become larger up to the power supply voltage PVDD.
As can be seen from the above, the first driving circuit 11 of the driving device 10 according to the present application includes the voltage detection module 112, the voltage control module 111 and the switch circuit 113, and is capable of dividing the pull-down discharging process of the first gate voltage hs_gt2 into a discharging stage of discharging the ground PGND and a discharging end of the voltage source 101, and discharging the discharging voltage vss_reg2 through the discharging end when the magnitude of the first gate voltage hs_gt2 is close to the discharging voltage vss_reg2, so that the first driving circuit 11 does not need to set an additional off-chip capacitor, and only needs to integrate an on-chip capacitor with a smaller capacitor, thereby saving the cost.
Fig. 5 is a partial flow chart of an embodiment of a control method of the driving device of the present application. The driving means may be the driving means 10 in the above-described embodiment. The control method of the driving device comprises the following steps:
step S10, a first driving circuit is provided, where the first driving circuit includes a voltage source, the voltage source includes a discharge end for providing a discharge voltage, and the first driving circuit is configured to provide a first gate voltage to a first power tube to control on or off of the first power tube.
And step S20, when the first grid voltage is larger than the first voltage, the grid of the first power tube is connected with the ground, and the ground is discharged.
And step S30, when the first grid voltage is reduced to a first voltage, the grid electrode of the first power tube is connected with the discharge end, the discharge end is discharged, and the first voltage is larger than the discharge voltage of the discharge end.
Optionally, in some embodiments, when the first gate voltage is greater than a first voltage, the discharging the first gate voltage to ground comprises: the voltage detection module outputs a detection signal of a first level to the discharge module so that the first grid voltage is discharged to the ground through the discharge module. When the first gate voltage is increased to a first voltage, the first gate voltage discharges a discharge voltage, the first voltage being greater than the discharge voltage, including: the voltage detection module outputs a detection signal of a second level to the discharge module so that the first grid voltage discharges the discharge end of the voltage source through the discharge module.
Optionally, in some embodiments, the discharge module includes a switching circuit including a first switching tube, a second switching tube, and a third switching tube, and a voltage control module. The discharging of the first gate voltage to ground through the discharging module includes: the voltage control module receives the detection signal of the first level and controls the second switching tube to be conducted, the first grid voltage discharges to the ground through the conducted second switching tube, and the first grid voltage is reduced.
Optionally, in some embodiments, the discharging of the discharge voltage by the discharge module comprises: the voltage control module receives the detection signal of the second level and controls the third switching tube to be conducted, and the first grid voltage discharges the discharge voltage through the conducted third switching tube.
Optionally, in some embodiments, the first voltage is greater than the discharge voltage and a difference between the first voltage and the discharge voltage is less than or equal to 1V.
Therefore, the voltage source can meet the current dynamic change requirement of the first power tube when the grid electrode discharges only by integrating the on-chip capacitor of the small capacitor without arranging the off-chip capacitor. In summary, the driving device and the control method thereof can save cost.
Although the application has been shown and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art based upon a reading and understanding of this specification and the annexed drawings. This application is intended to cover all such modifications and variations, and is limited only by the scope of the appended claims. In particular regard to the various functions performed by the above described components, the terms used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the specified function of the described component (e.g., that is functionally equivalent), even though not structurally equivalent to the disclosed structure which performs the function in the herein illustrated exemplary implementations of the specification.
The foregoing embodiments are merely examples of the present application, and are not intended to limit the scope of the patent application, so that all equivalent structures or equivalent processes using the descriptions and the drawings of the present application, such as the combination of technical features of the embodiments, or direct or indirect application to other related technical fields, are included in the scope of the patent protection of the present application.
Claims (15)
1. A driving device for driving a power output circuit, wherein the driving device comprises a first driving circuit, the power output circuit comprises a first power tube, and the first driving circuit is used for providing a first grid voltage to a grid of the first power tube so as to control the on or off of the first power tube; the first driving circuit includes:
the voltage source comprises a discharge end, wherein the discharge end is used for providing a discharge voltage;
the discharge module is connected with the grid electrode of the first power tube, the voltage source and the ground, and the first grid voltage can selectively discharge the discharge end of the voltage source or discharge the ground through the discharge module;
the voltage detection module is used for detecting the first grid voltage and controlling the discharge module according to the detected magnitude of the first grid voltage so as to selectively discharge the grid of the first power tube, wherein the voltage detection module is used for controlling the discharge module to discharge the first grid voltage to the ground when the first grid voltage is larger than the first voltage, and controlling the discharge module to discharge the first grid voltage to the discharge end of the voltage source when the first grid voltage reaches the first voltage, and the first voltage is larger than the discharge voltage.
2. The driving device according to claim 1, wherein the first power tube is a PMOS field effect transistor, the first driving circuit is connected to a gate of the first power tube, a power supply voltage is connected to a source of the first power tube, a drain of the first power tube is connected to an external load, and when the first power tube is turned on, the power supply voltage charges the external load through the turned-on first power tube.
3. The driving device according to claim 2, wherein the voltage detection module detects the first gate voltage, outputs a detection signal having a first level to the discharge module when the first gate voltage is greater than a first voltage, and outputs a detection signal having a second level when the first gate voltage is less than or equal to the first voltage;
the discharging module controls the first grid voltage to discharge to the ground according to the detection signal with the first level, and controls the first grid voltage to discharge to the discharging end of the voltage source according to the detection signal with the second level.
4. A driving device according to claim 3, wherein the discharge module comprises:
a switching circuit through which a power supply voltage charges or discharges a gate of a first power tube to provide the first gate voltage to the gate of the first power tube;
and the voltage control module is used for controlling the switching circuit according to the detection signal so that when the first grid voltage is discharged to the first voltage to the ground, the first grid voltage is switched from the discharge to the discharge end of the voltage source.
5. The driving device according to claim 4, wherein the switching circuit includes a first switching tube including a control terminal connected to the voltage control module, a first conduction terminal connected to a power supply voltage, and a second conduction terminal connected to a gate of a first power tube, the voltage control module supplying a first control voltage to the control terminal of the first switching tube to control on or off between the first and second conduction terminals of the first switching tube, the gate of the first power tube being charged when the first switching tube is turned on;
the second switching tube comprises a control end connected to the voltage control module, a first conduction end connected to the ground and a second conduction end connected to the grid electrode of the first power tube, the voltage control module provides a second control voltage to the control end of the second switching tube so as to control the conduction or the disconnection between the first conduction end and the second conduction end of the second switching tube, and when the second switching tube is conducted, the grid electrode of the first power tube discharges to the ground through the conducted second switching tube;
the third switching tube comprises a control end connected to the voltage control module, a first conduction end connected to the discharge end and a second conduction end connected to the grid electrode of the first power tube, and the voltage control module provides a third control voltage to the control end of the third switching tube so as to control the conduction or the disconnection between the first conduction end and the second conduction end of the third switching tube.
6. The driving device according to claim 5, wherein when a power supply voltage charges a gate of the first power tube, the first switching tube is turned on, the second switching tube is turned off, and the third switching tube is turned off; when the grid electrode of the first power tube discharges to the ground, the first switching tube is turned off, the second switching tube is turned on, and the third switching tube is turned off; when the grid electrode of the first power tube discharges the discharge end of the voltage source, the second switching tube is turned off, and the third switching tube is turned on.
7. The driving device according to claim 2, further comprising a second driving circuit, wherein the power output circuit further comprises a second power tube, the second power tube is an NMOS power tube, the second driving circuit is configured to provide a second gate voltage to a gate of the second power tube to control on or off of the second power tube, the second driving circuit is connected to the gate of the second power tube, a drain of the second power tube and a drain of the first power tube are commonly connected to an external load, a source of the second power tube is connected to ground, and when the second power tube is turned on, the first power tube is turned off, and the external load is discharged via the turned-on second power tube.
8. The driving device according to claim 7, wherein the second driving circuit and the first driving circuit are identical in structure.
9. The driving device of claim 7, further comprising a dead time control module for receiving the first gate voltage and the second gate voltage and providing a first adjustment signal to the first driving circuit and a second adjustment signal to the second driving circuit to control the first power transistor and the second power transistor to alternately conduct.
10. The drive device according to claim 1, wherein the first voltage and the discharge voltage differ by no more than 1V.
11. A control method of a driving device, comprising:
providing a first driving circuit, wherein the first driving circuit comprises a voltage source, the voltage source comprises a discharge end, the discharge end is used for providing a discharge voltage, and the first driving circuit is used for providing a first grid voltage to a first power tube so as to control the on or off of the first power tube;
when the first grid voltage is larger than the first voltage, the grid of the first power tube is connected with the ground and discharges to the ground;
when the first grid voltage is reduced to a first voltage, the grid electrode of the first power tube is connected with the discharge end to discharge the discharge end, and the first voltage is larger than the discharge voltage of the discharge end.
12. The control method of a driving device according to claim 11, wherein the first driving circuit further comprises a discharging module and a voltage detecting module;
when the first grid voltage is larger than the first voltage, the grid of the first power tube is connected with the ground, and the discharging to the ground comprises the following steps: the voltage detection module outputs a detection signal of a first level to the discharge module so that the first grid voltage is discharged to the ground through the discharge module;
when the first grid voltage is reduced to a first voltage, the grid of the first power tube is connected with the discharge end, the discharge end is discharged, and the first voltage is larger than the discharge voltage of the discharge end and comprises the following components: the voltage detection module outputs a detection signal of a second level to the discharge module so that the first grid voltage discharges the discharge end of the voltage source through the discharge module.
13. The control method of a driving device according to claim 12, wherein the discharging module includes a switching circuit and a voltage control module, the switching circuit including a first switching tube, a second switching tube, and a third switching tube;
the discharging of the first gate voltage to ground through the discharging module includes: the voltage control module receives the detection signal of the first level and controls the second switching tube to be conducted, the first grid voltage discharges to the ground through the conducted second switching tube, and the first grid voltage is reduced.
14. The control method of the driving device according to claim 13, wherein discharging the discharge voltage by the discharge module with the first gate voltage includes: the voltage control module receives the detection signal of the second level and controls the third switching tube to be conducted, and the first grid voltage discharges the discharge voltage through the conducted third switching tube.
15. An electronic device comprising a driving means, a power output circuit and a load, the driving circuit being for driving the power output circuit to provide a load voltage to the load, wherein the driving circuit is the driving means of any one of claims 1 to 10.
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