CN110069954B - MST driver and driving method thereof - Google Patents
MST driver and driving method thereof Download PDFInfo
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- CN110069954B CN110069954B CN201910438695.4A CN201910438695A CN110069954B CN 110069954 B CN110069954 B CN 110069954B CN 201910438695 A CN201910438695 A CN 201910438695A CN 110069954 B CN110069954 B CN 110069954B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
- G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
- G06K7/087—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors flux-sensitive, e.g. magnetic, detectors
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Abstract
The invention relates to an MST driver and a driving method thereof. A switching element (1) and a switching element (2) on a high-voltage side and a switching element (3) and a switching element (4) on a low-voltage side between a power supply voltage and ground are connected to form a bridge circuit, an MST coil (5) is connected between two output ends of the bridge circuit, the switching element (3) is composed of a plurality of sub-switching elements connected in parallel, and the switching element (4) is composed of a plurality of sub-switching elements connected in parallel.
Description
Technical Field
The invention relates to an MST (magnetic secure transmission, magnetic security transport) driver and a driving method thereof.
Background
Currently, in the conventional settlement method, it is still common to use a card scanning at a settlement terminal to transmit information of a card magnetic stripe (MAGNETIC STRIPE) to the settlement terminal, so as to perform settlement. Fig. 9 shows the principle of operation of a conventional magnetic stripe information transmission system. As shown in fig. 9, the magnetic strip in the card is formed by connecting a plurality of magnets, and the plurality of magnets include a magnet having a longer length and a magnet having a shorter length. By the action of scanning the card, the magnetic information reading head (MAGNETIC READ HEAD, hereinafter simply referred to as a reading head or MRH) of the settlement terminal detects the waveform as shown in fig. 9, and changes the waveform into a digital output. As shown in fig. 9, it can be considered that a magnet having a longer length is converted into bit 0 and a magnet having a shorter length is converted into bit 1.
In recent years, a method has been proposed in which magnetic information is generated inside a device such as a smart phone, and settlement can be performed without using a physical card, and this method is called MST (magnetic secure transmission, magnetic secure transfer). In addition, the device that generates the MST signal is referred to as an MST driver. Fig. 10 shows a prior art full-bridge MST driver, and fig. 11 shows control signals, coil currents, and output voltages of a read head when the MST driver of fig. 10 is in operation. As shown in fig. 10, the MST driver includes four switching elements 100 to 400 and an MST coil 500 connected in a full bridge manner between a power supply voltage Vin and ground, and the switching elements 100 to 400 each include a body diode.
In fig. 11, (a) shows a control signal for controlling the MST driver, and (b) shows an induced current of the MST coil 500 and an output voltage of the read head for detecting the induced current when the MST driver is operating. A control signal for controlling the current direction of the MST coil 500 is generally provided from the outside, so that a magnetic flux variation similar to the length of a magnet in a conventional magnetic stripe can be achieved. As shown in fig. 11 (b), the induced current of the MST coil 500 is changed under the control of the control signal supplied from the outside, so that the read head can detect the change in the induced current and output a voltage waveform similar to that of the read head in fig. 9. Thus, actions similar to scanning a conventional magnetic stripe can be performed.
As can be seen from fig. 11, the voltage detected by the reading head and the current flowing through the MST coil 500 have a proportional relationship with each other, that is, the time-dependent gradient, and the relationship can be expressed by the following equation (1).
Here, L coil denotes an inductance value of the MST coil 500, I coil denotes a current flowing through the MST coil 500, and V RH denotes a voltage of the reading head.
As shown in fig. 11 (b), information is transferred only during the period when the current of the MST coil 500 rises or falls, and is not transferred during the steady state (STEADY STATE) indicated as the DC component. However, even if no information is transferred, a large current flows through the MST coil 500 during steady state, and thus there is always a large power consumption during this period. Accordingly, it is desirable to provide an MST driver that can suppress power consumption during this steady state.
Disclosure of Invention
The present invention is directed to solving one or more problems occurring in the prior art, and provides an MST driver and a driving method thereof that have low power consumption and can accurately transfer magnetic information.
One aspect of the present invention relates to a method for driving an MST driver, the MST driver including: a first switching element and a second switching element on the high voltage side; and a third switching element and a fourth switching element on the low voltage side, the first switching element being connected in a bridging manner between the voltage source and ground to the fourth switching element to form a bridge circuit, the coil being connected between the outputs of the bridge circuit, the third switching element comprising a plurality of sub-switching elements, the fourth switching element comprising a plurality of sub-switching elements,
The periods in which the first switching element is at a high level and the second switching element is at a low level include a first period in which the fourth switching element is turned on, a second period in which each of the sub-switching elements of the fourth switching element is turned off in turn, and a third period in which each of the sub-switching elements of the fourth switching element is in an off state,
The periods in which the first switching element is at a low level and the second switching element is at a high level include a fourth period in which the third switching element is turned on, a fifth period in which each of the sub-switching elements of the third switching element is turned off in sequence, and a sixth period in which each of the sub-switching elements of the third switching element is turned off.
Another aspect of the present invention relates to a method for driving an MST driver including: a first switching element and a second switching element on the high voltage side; and a third switching element and a fourth switching element on the low voltage side, the first switching element being connected in a bridging manner between the voltage source and ground to the fourth switching element to form a bridge circuit, the coil being connected between the outputs of the bridge circuit, the third switching element comprising a plurality of sub-switching elements, the fourth switching element comprising a plurality of sub-switching elements,
The period in which the first switching element is at a high level and the second switching element is at a low level includes a first period, a second period, a third period and a fourth period,
Sequentially turning on the sub-switching elements of the fourth switching element at a first inclination rate during the first period, sequentially turning off the sub-switching elements of the fourth switching element at a second inclination rate smaller in absolute value than the first inclination rate during the second period, sequentially turning off the sub-switching elements of the fourth switching element during the third period, sequentially turning on the sub-switching elements of the fourth switching element again at the second inclination rate during the fourth period,
The periods in which the first switching element is at a low level and the second switching element is at a high level also include the first period, the second period, the third period and the fourth period,
In the first period, the sub-switching elements of the third switching element are sequentially turned on at the first inclination rate, in the second period, the sub-switching elements of the third switching element are sequentially turned off at the second inclination rate, in the third period, the sub-switching elements of the third switching element are all in an off state, and in the fourth period, the sub-switching elements of the third switching element are sequentially turned on again at the second inclination rate.
A further aspect of the present invention relates to a method for driving an MST driver, the MST driver including: a first switching element and a second switching element on the high voltage side; and third and fourth switching elements on the low side, the first switching element comprising a plurality of sub-switching elements and the second switching element comprising a plurality of sub-switching elements being connected in a bridging manner between a voltage source and ground to the fourth switching element to form a bridge circuit, the coil being connected between the outputs of the bridge circuit,
The periods in which the third switching element is at a low level and the fourth switching element is at a high level include a first period in which the first switching element is turned on, a second period in which each of the sub-switching elements of the first switching element is turned off in turn, and a third period in which each of the sub-switching elements of the first switching element is turned off,
The periods in which the third switching element is at the high level and the fourth switching element is at the low level include a fourth period in which the second switching element is turned on, a fifth period in which each of the sub-switching elements of the second switching element is turned off in sequence, and a sixth period in which each of the sub-switching elements of the second switching element is turned off.
A further aspect of the present invention relates to a method for driving an MST driver, the MST driver including: a first switching element and a second switching element on the high voltage side; and third and fourth switching elements on the low side, the first switching element comprising a plurality of sub-switching elements and the second switching element comprising a plurality of sub-switching elements being connected in a bridging manner between a voltage source and ground to the fourth switching element to form a bridge circuit, the coil being connected between the outputs of the bridge circuit,
The period in which the third switching element is at a low level and the fourth switching element is at a high level includes a first period, a second period, a third period and a fourth period,
In the first period, the sub-switching elements of the first switching element are sequentially turned on at a first inclination rate, in the second period, the sub-switching elements of the first switching element are sequentially turned off at a second inclination rate smaller in absolute value than the first inclination rate, in the third period, the sub-switching elements of the first switching element are all in an off state, in the fourth period, the sub-switching elements of the first switching element are sequentially turned on again at the second inclination rate,
The periods in which the third switching element is at a high level and the fourth switching element is at a low level also include the first period, the second period, the third period and the fourth period,
In the first period, the sub-switching elements of the second switching element are sequentially turned on at the first inclination rate, in the second period, the sub-switching elements of the second switching element are sequentially turned off at the second inclination rate, in the third period, the sub-switching elements of the second switching element are all in an off state, and in the fourth period, the sub-switching elements of the second switching element are sequentially turned on again at the second inclination rate.
In addition, an aspect of the present invention relates to an MST driver including: a first switching element and a second switching element on the high voltage side; and third and fourth switching elements on the low side, the first switching element being connected to the fourth switching element in a bridging manner between the voltage source and ground to form a bridge circuit, the coil being connected between the outputs of the bridge circuit, the third switching element comprising a plurality of sub-switching elements, the fourth switching element comprising a plurality of sub-switching elements.
Another aspect of the present invention relates to an MST driver, including: a first switching element and a second switching element on the high voltage side; and third and fourth switching elements on the low voltage side, the first switching element including a plurality of sub-switching elements and the second switching element including a plurality of sub-switching elements being connected in a bridging manner between a voltage source and ground to the fourth switching element to constitute a bridge circuit, and a coil being connected between output terminals of the bridge circuit.
According to the present invention, low power consumption of the MST driver can be realized, and power consumption of the MST driver and detection capability of the reading head of the settlement terminal can be optimized.
Drawings
Fig. 1 shows a structure of an MST driver according to embodiment 1.
Fig. 2 shows control signals, coil currents, and output voltages of the read head of the MST driver according to embodiment 1.
Fig. 3 shows control signals, coil currents, and output voltages of the read head of the MST driver according to modification 1.
Fig. 4 shows control signals, coil currents, and output voltages of the read head of the MST driver according to modification 2.
Fig. 5 shows a structure of an MST driver according to embodiment 2.
Fig. 6 shows control signals, coil currents, and output voltages of the read head of the MST driver according to embodiment 2.
Fig. 7 shows control signals, coil currents, and output voltages of the read head of the MST driver according to modification 3.
Fig. 8 shows control signals, coil currents, and output voltages of the read head of the MST driver according to modification 4.
Fig. 9 shows the principle of operation of a conventional magnetic stripe information transmission system.
Fig. 10 shows a prior art full bridge MST driver.
Fig. 11 shows control signals, coil currents, and output voltages of the read head when the MST driver of fig. 10 is operated.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
Fig. 1 shows a structure of an MST driver according to embodiment 1. As shown in fig. 1, in the MST driver of the present invention, a switching element 1 and a switching element 2 on a High Side (High Side) and a switching element 3 and a switching element 4 on a Low Side (Low Side) between a power supply voltage Vin and ground are connected as a bridge circuit, an MST coil 5 is connected between two output terminals OUT1 and OUT2 of the bridge circuit, the switching element 3 on the Low Side is composed of a plurality of sub-switching elements 30, 31, … … x connected in parallel, and the switching element 4 is composed of a plurality of sub-switching elements 40, 41, … … x connected in parallel, where x is not less than 1.
As shown in fig. 1, the switching element 1 and the switching element 2 on the high voltage side are NMOS transistors, each of the sub-switching elements of the switching element 3 and the switching element 4 on the low voltage side is also an NMOS transistor, and each switching element includes a body diode. The switching element 1 has a drain connected to the power supply voltage Vin, a source connected in series to the drains of the sub-switching elements 30, 31, … … x connected in parallel, and a source of each sub-switching element 30, 31, … … x connected to ground. The drain of the switching element 2 is connected to the power supply voltage Vin, the source thereof is connected in series to the drains of the sub-switching elements 40, 41, … … x connected in parallel, and the sources of the sub-switching elements 40, 41, … … x are grounded. The control signals may be provided by an external driver or a built-in driver to individually control the on and off of the switching elements 1 to 4, respectively.
Fig. 2 shows control signals, coil currents, and output voltages (detection voltages) of the reading head of the MST driver according to embodiment 1, in which HG1 and HG2 show the levels of the switching elements 1 and 2 on the high voltage side, LG3 and LG4 show the levels of the switching elements 3 and 4 on the low voltage side, I coil shows the current flowing through the MST coil 5, MRH voltage shows the voltage output from the reading head of the settlement terminal, V T shows the threshold voltage at which the reading head of the settlement terminal can detect magnetic information, and when MRH voltage is smaller than V T, the reading head cannot detect magnetic information. The levels LG3 and LG4 of the switching elements 3 and 4 on the low voltage side can be expressed by the following expressions (2) and (3).
LG3＝W10·LG30+W11·LG31+…+W1x·LG3x (2)
LG4＝W20·LG40+W21.LG41+…+W2x·LG4x (3)
Where W1x denotes a channel width of each sub-switching element 3x of the switching element 3, W2x denotes a channel width of each sub-switching element 4x of the switching element 4, LG3x denotes whether each sub-switching element 3x of the switching element 3 is on (i.e., 1 is turned on and 0 is turned off), and LG4x denotes whether each sub-switching element 4x of the switching element 4 is on (i.e., 1 is turned on and 0 is turned off).
As shown in fig. 2, in the period in which the switching element 1 is at the high level, the period is divided into three periods t 1、t2 and t 3. In the period t 1, the respective sub-switching elements of the switching element 4 are turned on in turn at the first inclination rate, so that the sub-switching elements 40, 41, … … x are turned on in turn, and at the end of the period t 1, all the sub-switching elements 40, 41, … … x are turned on, and during this period, the current of the coil 5 rises. As can be seen from the equation (1), during t 1, the voltage of the read head takes a large negative value, and the MRH voltage exceeds the threshold voltage V T as shown in fig. 2, so that the read head can detect magnetic information. Then, during the period t 2, the sub-switching elements 40, 41, … … x are turned off in order at a second inclination rate smaller in absolute value than the first inclination rate, and at the end of the period t 2, all of the sub-switching elements 40, 41, … … x are turned off, and during this period, the current of the coil 5 decreases. As can be seen from the equation (1), the voltage of the read head takes a small positive value during t 2, but the MRH voltage is lower than the threshold voltage V T as shown in fig. 2, so the read head cannot detect magnetic information. Finally, during t 3, the sub-switching elements 40, 41, … … x are maintained open. Since all the sub-switching elements 40, 41, … … x are turned off during t 3, no current flows and no power is consumed. This allows magnetic information to be transmitted accurately and to operate at low power. While the switching element 2 is at the high level, the sub-switching elements 30, 31, … … x repeat the above operations except that the current of the coil 5 and the voltage of the read head are opposite in sign.
Fig. 2 shows the current of the coil 5 and the voltage of the read head simply for convenience of explanation, and in practical application, I coil and MRH voltages shown in fig. 2 can be obtained by dividing the switching elements 3 and4 on the low-voltage side into infinite sub-switching elements and implementing the control signal in an infinitely short time.
In fig. 2, the period t 1 is shorter than the period t 2, but the length of the period t 3 may be specifically defined as needed, and the same applies hereinafter.
The manner of dividing the switching elements 3 and 4 on the low voltage side into a plurality of sub-switching elements may be realized by, for example, a weighted binary manner, and is not particularly limited herein.
Modification 1
Fig. 3 shows control signals, coil currents, and output voltages of the read head of the MST driver according to modification 1. In comparison with embodiment 1 of fig. 2, the difference is that, in the period in which the switching element 1 or 2 is at the high level, the period is divided into four periods t 1′、t2′、t3' and t 4.
As shown in fig. 3, for example, during the period in which the switching element 1 is at the high level, the control method during the period t 1′、t2′、t3 ' is the same as that of embodiment 1, that is, during the period t 1 ', the respective sub-switching elements of the switching element 4 are sequentially turned on at a third inclination rate having an absolute value larger than the first inclination rate, and at the end of the period t 1 ', all the sub-switching elements 40, 41, … … x are turned on. Next, during the period t 2 ', the sub-switching elements 40, 41, … … x are turned off in order at a fourth inclination rate having an absolute value smaller than the third inclination rate, and at the end of the period t 2', all of the sub-switching elements 40, 41, … … x are turned off. Then, during t 3', the sub-switching elements 40, 41, … … x are maintained open. Finally, during t4, the respective sub-switching elements 40, 41, … … 4x in the off state are turned on again in sequence at the fourth ramp rate. As shown in FIG. 3, during t 2' and during t4, the MRH voltage is below threshold voltage V T, so the read head is unable to detect magnetic information. While the switching element 2 is at the high level, the sub-switching elements 30, 31, … … x repeat the above operations except that the current of the coil 5 and the voltage of the read head are opposite in sign.
Since each of the sub-switches in the off state is turned back on during t4 as compared with embodiment 1 shown in fig. 2, power consumption is not as low as embodiment 1. However, since the respective sub-switching elements of the switching element 4 are sequentially turned on at the third inclination ratio having the absolute value larger than the first inclination ratio, the voltage detected by the reading head can be made larger during this period (t 1'), and thus the detection capability of the detection head can be improved. The length of the periods t 1′、t2′、t3' and t4 can be set appropriately, with a trade-off between power consumption and detection capability, as desired.
Modification 2
Fig. 4 shows control signals, coil currents, and output voltages of the read head of the MST driver according to modification 2. In comparison with embodiment 1 of fig. 2, the difference is that each sub-switching element is not turned on sequentially but is turned on simultaneously during t 1.
In addition, in comparison with modification 1 of fig. 3, in modification 2 shown in fig. 4, the absolute value of the gradient of the current of the coil 5 is increased by simultaneously turning on the sub-switching elements, and thus the absolute value of the voltage (MRH voltage) detected by the reading head is increased, instead of providing the period t4 shown in fig. 3. Therefore, the power consumption of the MST driver and the detection capability of the reading head can be combined.
(Embodiment 2)
The above describes a configuration in which the two switching elements on the low voltage side are divided into a plurality of sub-switching elements, respectively. However, the present invention is not limited to this, and each switching element on the high voltage side may be divided into a plurality of sub-switching elements.
Fig. 5 shows a structure of an MST driver according to embodiment 2. As shown in fig. 5, in the MST driver of embodiment 2, a switching element 1' and a switching element 2' on a High Side (High Side) and a switching element 3' and a switching element 4' on a Low Side (Low Side) between a power supply voltage Vin and ground are connected as a bridge circuit, an MST coil 5 is connected between two output terminals OUT1 and OUT2 of the bridge circuit, the switching element 1' on the High Side is configured by a plurality of sub-switching elements 10, 11, … … 1x connected in parallel, and the switching element 2 is configured by a plurality of sub-switching elements 20, 21, … … x connected in parallel, where x is not less than 1.
As shown in fig. 5, all the switching elements are NMOS transistors, and each switching element includes a body diode. The drains of the sub-switching elements 1 'connected in parallel are connected to the power supply voltage Vin, the sources of the sub-switching elements 1' are connected in series to the drains of the switching elements 3', and the sources of the switching elements 3' are grounded. The drain of each of the sub-switching elements 2 'connected in parallel is connected to the power supply voltage Vin, the source of each of the sub-switching elements 2' is connected in series to the drain of the switching element 4', and the source of the switching element 4' is grounded. As in embodiment 1, the control signal may be supplied from an external driver or a built-in driver to individually control the on and off of the switching elements 1 'to 4', respectively.
Fig. 6 shows control signals, coil currents, and output voltages of the read head of the MST driver according to embodiment 2. Similarly to fig. 2 of embodiment 1, in the period in which the switching element 4' is at the high level, the period is divided into three periods t 1、t2 and t 3. In the period t 1, the respective sub-switching elements of the switching element 1' are turned on in turn at the first inclination rate, so that the sub-switching elements 10, 11, … … x are turned on in turn, and at the end of the period t 1, all the sub-switching elements 10, 11, … … x are turned on. Similar to FIG. 2, during t 1, the MRH voltage exceeds the threshold voltage V T, so the read head can detect magnetic information. Then, during the period t 2, the sub-switching elements 10, 11, … … x are turned off in order at a second inclination rate whose absolute value is smaller than the first inclination rate, and at the end of the period t 2, all of the sub-switching elements 10, 11, … … x are turned off, during which the current of the coil 5 decreases, the voltage of the read head takes a small positive value but is lower than the threshold voltage V T, and therefore the read head cannot detect magnetic information. Finally, during t 3, the sub-switching elements 10, 11, … … x are maintained open. Since all the sub-switching elements 10, 11, … … 1x are turned off during t 3, no current flows and no power is consumed. This allows magnetic information to be transmitted accurately and to operate at low power. While the switching element 3' is at the high level, the sub-switching elements 20, 21, … … x repeat the above operations except that the current of the coil 5 and the voltage of the read head are opposite in sign.
Modification 3
Fig. 7 shows control signals, coil currents, and output voltages of the read head of the MST driver according to modification 3. In comparison with embodiment 2 of fig. 6, the difference is that the period in which the switching element 3' or 4' is at the high level is divided into four periods t 1′、t2′、t3 ' and t 4.
As shown in fig. 7, for example, during the period in which the switching element 4' is at the high level, the control method during the period t 1′、t2′、t3 ' is similar to that of modification 1, that is, during the period t 1 ', each of the sub-switching elements of the switching element 1' is sequentially turned on at a third inclination rate having an absolute value larger than the first inclination rate, and at the end of the period t 1 ', all of the sub-switching elements 10, 11, … … 1x are turned on. Next, during the period t 2 ', the sub-switching elements 10, 11, … … x are turned off in order at a fourth inclination rate having an absolute value smaller than the third inclination rate, and at the end of the period t 2', all of the sub-switching elements 10, 11, … … x are turned off. Then, during t 3', the sub-switching elements 10, 11, … … x are maintained open. Finally, during t4, the respective sub-switching elements 10, 11, … … 1x in the off state are turned on again in sequence at the fourth ramp rate. As shown in FIG. 7, during t 2' and during t4, the MRH voltage is below threshold voltage V T, so the read head is unable to detect magnetic information. While the switching element 3' is at the high level, the sub-switching elements 20, 21, … … x repeat the above operations except that the current of the coil 5 and the voltage of the read head are opposite in sign.
Since each of the sub-switches in the off state is turned back on during t4 as compared with embodiment 2 shown in fig. 6, power consumption is not as low as that of embodiment 2. However, since the respective sub-switching elements of the switching element 1 'are sequentially turned on at the third inclination rate larger than the first inclination rate, the voltage detected by the reading head can be made larger during this period (t 1'), and thus the detection capability of the detection head can be improved.
Modification 4
Fig. 8 shows control signals, coil currents, and output voltages of the read head of the MST driver according to modification 4. In comparison with embodiment 2 of fig. 6, the difference is that, during t1, each of the sub-switching elements on the high-voltage side is not turned on sequentially, but each of the sub-switching elements is turned on simultaneously.
In addition, in comparison with modification 3 of fig. 7, in modification 4 shown in fig. 8, the absolute value of the gradient of the current of the coil 5 is increased by simultaneously turning on the sub-switching elements, and the absolute value of the voltage (MRH voltage) detected by the reading head is increased, instead of providing the period t4 shown in fig. 7. Therefore, the power consumption of the MST driver and the detection capability of the reading head can be combined.
The above description has described several embodiments of the present invention, but the present invention is not limited thereto. For example, the high-voltage side switching element is exemplified as an NMOS transistor in the above description, but the high-voltage side switching element may be constituted by a PMOS transistor. Various changes or modifications may be made without departing from the spirit of the invention, and such changes or modifications are obviously included in the scope of the invention.
Claims (14)
1. A driving method of an MST driver, the MST driver comprises: a first switching element and a second switching element on the high voltage side; and a third switching element and a fourth switching element on the low voltage side, the first switching element being connected in a bridging manner between the voltage source and ground to the fourth switching element to form a bridge circuit, the coil being connected between the outputs of the bridge circuit, the third switching element comprising a plurality of sub-switching elements, the fourth switching element comprising a plurality of sub-switching elements,
The periods in which the first switching element is at a high level and the second switching element is at a low level include a first period in which the fourth switching element is turned on, a second period in which each of the sub-switching elements of the fourth switching element is turned off in turn, and a third period in which each of the sub-switching elements of the fourth switching element is in an off state,
The periods in which the first switching element is at a low level and the second switching element is at a high level include a fourth period in which the third switching element is turned on, a fifth period in which each of the sub-switching elements of the third switching element is turned off in sequence, and a sixth period in which each of the sub-switching elements of the third switching element is turned off.
2. The driving method of an MST driver as claimed in claim 1, wherein,
The sub-switching elements of the fourth switching element are turned on sequentially at a first inclination rate during the first period, the sub-switching elements of the fourth switching element are turned off sequentially at a second inclination rate smaller in absolute value than the first inclination rate during the second period,
In the fourth period, the sub-switching elements of the third switching element are turned on sequentially at the first inclination rate to turn on the third switching element, in the fifth period, the sub-switching elements of the third switching element are turned off sequentially at the second inclination rate,
The first period and the fourth period have the same length, the second period and the fifth period have the same length, and the third period and the sixth period have the same length.
3. The driving method of an MST driver as claimed in claim 1, wherein,
Simultaneously turning on sub-switching elements of the fourth switching element to realize turning on of the fourth switching element during the first period,
During the fourth period, each sub-switching element of the third switching element is turned on simultaneously to realize the turning on of the third switching element,
The first period and the fourth period have the same length, the second period and the fifth period have the same length, and the third period and the sixth period have the same length.
4. A driving method of an MST driver, the MST driver comprises: a first switching element and a second switching element on the high voltage side; and a third switching element and a fourth switching element on the low voltage side, the first switching element being connected in a bridging manner between the voltage source and ground to the fourth switching element to form a bridge circuit, the coil being connected between the outputs of the bridge circuit, the third switching element comprising a plurality of sub-switching elements, the fourth switching element comprising a plurality of sub-switching elements,
The period in which the first switching element is at a high level and the second switching element is at a low level includes a first period, a second period, a third period and a fourth period,
Sequentially turning on the sub-switching elements of the fourth switching element at a first inclination rate during the first period, sequentially turning off the sub-switching elements of the fourth switching element at a second inclination rate smaller in absolute value than the first inclination rate during the second period, sequentially turning off the sub-switching elements of the fourth switching element during the third period, sequentially turning on the sub-switching elements of the fourth switching element again at the second inclination rate during the fourth period,
The periods in which the first switching element is at a low level and the second switching element is at a high level also include the first period, the second period, the third period, and the fourth period,
In the first period, the sub-switching elements of the third switching element are sequentially turned on at the first inclination rate, in the second period, the sub-switching elements of the third switching element are sequentially turned off at the second inclination rate, in the third period, the sub-switching elements of the third switching element are all in an off state, and in the fourth period, the sub-switching elements of the third switching element are sequentially turned on again at the second inclination rate.
5. A driving method of an MST driver, the MST driver comprises: a first switching element and a second switching element on the high voltage side; and third and fourth switching elements on the low side, the first switching element comprising a plurality of sub-switching elements and the second switching element comprising a plurality of sub-switching elements being connected in a bridging manner between a voltage source and ground to the fourth switching element to form a bridge circuit, the coil being connected between the outputs of the bridge circuit,
The periods in which the third switching element is at a low level and the fourth switching element is at a high level include a first period in which the first switching element is turned on, a second period in which each of the sub-switching elements of the first switching element is turned off in turn, and a third period in which each of the sub-switching elements of the first switching element is turned off,
The periods in which the third switching element is at the high level and the fourth switching element is at the low level include a fourth period in which the second switching element is turned on, a fifth period in which each of the sub-switching elements of the second switching element is turned off in sequence, and a sixth period in which each of the sub-switching elements of the second switching element is turned off.
6. The driving method of an MST driver as claimed in claim 5, wherein,
The sub-switching elements of the first switching element are turned on sequentially at a first inclination rate during the first period, the sub-switching elements of the first switching element are turned off sequentially at a second inclination rate smaller in absolute value than the first inclination rate during the second period,
In the fourth period, the sub-switching elements of the second switching element are turned on sequentially at the first inclination rate to turn on the second switching element, in the fifth period, the sub-switching elements of the second switching element are turned off sequentially at the second inclination rate,
The first period and the fourth period have the same length, the second period and the fifth period have the same length, and the third period and the sixth period have the same length.
7. The driving method of an MST driver as claimed in claim 5, wherein,
During the first period, each sub-switching element of the first switching element is simultaneously turned on to realize the turning-on of the first switching element,
During the fourth period, each sub-switching element of the second switching element is turned on simultaneously to realize the turning on of the third switching element,
The first period and the fourth period have the same length, the second period and the fifth period have the same length, and the third period and the sixth period have the same length.
8. A driving method of an MST driver, the MST driver comprises: a first switching element and a second switching element on the high voltage side; and third and fourth switching elements on the low side, the first switching element comprising a plurality of sub-switching elements and the second switching element comprising a plurality of sub-switching elements being connected in a bridging manner between a voltage source and ground to the fourth switching element to form a bridge circuit, the coil being connected between the outputs of the bridge circuit,
The period in which the third switching element is at a low level and the fourth switching element is at a high level includes a first period, a second period, a third period and a fourth period,
In the first period, the sub-switching elements of the first switching element are sequentially turned on at a first inclination rate, in the second period, the sub-switching elements of the first switching element are sequentially turned off at a second inclination rate smaller in absolute value than the first inclination rate, in the third period, the sub-switching elements of the first switching element are all in an off state, in the fourth period, the sub-switching elements of the first switching element are sequentially turned on again at the second inclination rate,
The periods in which the third switching element is at a high level and the fourth switching element is at a low level also include a first period, a second period, a third period and a fourth period,
In the first period, the sub-switching elements of the second switching element are sequentially turned on at the first inclination rate, in the second period, the sub-switching elements of the second switching element are sequentially turned off at the second inclination rate, in the third period, the sub-switching elements of the second switching element are all in an off state, and in the fourth period, the sub-switching elements of the second switching element are sequentially turned on again at the second inclination rate.
9. An MST driver includes:
a first switching element and a second switching element on the high voltage side; and
A third switching element and a fourth switching element on the low voltage side,
Connecting the first switching element to the fourth switching element in a bridging manner between a voltage source and ground to form a bridge circuit, connecting a coil between the outputs of the bridge circuit,
The third switching element includes a plurality of sub-switching elements, the fourth switching element includes a plurality of sub-switching elements, and the plurality of sub-switching elements of the third switching element and the sub-switching elements of the fourth switching element are driven by the driving method of any one of claims 1 to 4.
10. The MST driver of claim 9 wherein,
The first to fourth switching elements are composed of NMOS transistors.
11. The MST driver of claim 9 wherein,
The first switching element and the second switching element are formed by PMOS tubes, and the third switching element and the fourth switching element are formed by NMOS tubes.
12. An MST driver includes:
a first switching element and a second switching element on the high voltage side; and
A third switching element and a fourth switching element on the low voltage side,
Connecting the first switching element to the fourth switching element in a bridging manner between a voltage source and ground to form a bridge circuit, connecting a coil between the outputs of the bridge circuit,
The first switching element includes a plurality of sub-switching elements, the second switching element includes a plurality of sub-switching elements, and the plurality of sub-switching elements of the first switching element and the sub-switching elements of the second switching element are driven by the driving method of any one of claims 5 to 8.
13. The MST driver of claim 12 wherein,
The first to fourth switching elements are composed of NMOS transistors.
14. The MST driver of claim 12 wherein,
The first switching element and the second switching element are formed by PMOS tubes, and the third switching element and the fourth switching element are formed by NMOS tubes.
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