CN216721212U - Drive circuit and electronic equipment - Google Patents
Drive circuit and electronic equipment Download PDFInfo
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- CN216721212U CN216721212U CN202122998328.5U CN202122998328U CN216721212U CN 216721212 U CN216721212 U CN 216721212U CN 202122998328 U CN202122998328 U CN 202122998328U CN 216721212 U CN216721212 U CN 216721212U
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Abstract
A drive circuit and an electronic device, the drive circuit comprising: the H-bridge circuit drives or stops driving driven equipment under the control of the first control end to the fourth control end; when the signals from the first control end to the fourth control end are combined into a first signal, the gate circuit outputs a first level signal for opening the first normally closed switch circuit and the second normally closed switch circuit through a fifth control end; the first normally closed switch circuit is controlled by a fifth control end to switch on or off the first output end and the grounding end; and the second normally-closed switch circuit is controlled by a fifth control end to switch on or off the second output end and the grounding end. According to the scheme provided by the embodiment, before power is supplied, the first normally-closed switch circuit and the second normally-closed switch circuit are closed, and the reverse electromotive force generated when the driven equipment is manually rotated can be released, so that the equipment is prevented from being damaged.
Description
Technical Field
The present invention relates to electronic technology, and more particularly, to a driving circuit and an electronic apparatus.
Background
The traditional motor is driven by an H-bridge integrated circuit, and different control signals are loaded on the H-bridge integrated circuit, so that the rotation of the motor in different directions is realized. Research shows that the driving circuit may be damaged when the motor is in a power-off state.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a driving circuit and electronic equipment, and improves the safety in a power-off state.
An embodiment of the present invention further provides a driving circuit, including: the H-bridge circuit is connected with a voltage input end, a grounding end, a first control end, a second control end, a third control end, a fourth control end, a first output end and a second output end, the gate circuit is connected with the first control end, the second control end, the third control end, the fourth control end and a fifth control end, the first normally closed switch circuit is connected with the fifth control end, the first output end and the grounding end, the second normally closed switch circuit is connected with the fifth control end, the second output end and the grounding end, wherein,
the H-bridge circuit is configured to output a driving current to a driven device connected between the first output end and the second output end when the signals from the first control end to the fourth control end are combined into a first signal, and stop outputting the driving current to the driven device connected between the first output end and the second output end when the signals from the first control end to the fourth control end are combined into a second signal;
the gate circuit is configured to output a first level signal for opening the first normally-closed switch circuit and the second normally-closed switch circuit through a fifth control end when the signals from the first control end to the fourth control end are combined into a first signal;
the first normally-closed switch circuit is configured to turn on or off the first output terminal and the ground terminal under the control of the fifth control terminal;
the second normally-closed switch circuit is configured to turn on or off the second output terminal and the ground terminal under the control of the fifth control terminal.
In an exemplary embodiment, the gate circuit is further configured to output a second level signal for closing the first normally-closed switch circuit and the second normally-closed switch circuit through a fifth control terminal when the signals of the first control terminal to the fourth control terminal are combined into a second signal.
In an exemplary embodiment, the H-bridge circuit comprises a first leg sub-circuit, a second leg sub-circuit, a third leg sub-circuit and a fourth leg sub-circuit, the first leg sub-circuit is connected to the first control terminal, the voltage input terminal and the first output terminal, the second leg sub-circuit is connected to the second control terminal, the voltage input terminal and the second output terminal, the third leg sub-circuit is connected to the third control terminal, the first output terminal and the ground terminal, and the fourth leg sub-circuit is connected to the fourth control terminal, the second output terminal and the ground terminal, wherein:
the first bridge arm sub-circuit is configured to switch on or off the voltage input end and the first output end according to the control of the first control end;
the second bridge arm sub-circuit is configured to switch on or off the voltage input end and the second output end according to the control of the second control end;
the third bridge arm sub-circuit is configured to turn on or off the first output terminal and the ground terminal according to control of the third control terminal;
the fourth bridge arm sub-circuit is configured to turn on or off the second output terminal and the ground terminal according to control of the fourth control terminal.
In an exemplary embodiment, the H-bridge circuit includes a first leg sub-circuit, a second leg sub-circuit, a third leg sub-circuit, a fourth leg sub-circuit, and a protection sub-circuit, the first leg sub-circuit is connected to a first control terminal, a voltage input terminal, and a first node, the second leg sub-circuit is connected to a second control terminal, a voltage input terminal, and a second output terminal, the third leg sub-circuit is connected to a third control terminal, a first node, and a ground terminal, the fourth leg sub-circuit is connected to a fourth control terminal, a second output terminal, and a ground terminal, and the protection sub-circuit is connected between the first node and the first output terminal, wherein:
the first bridge arm sub-circuit is configured to turn on or off the voltage input end and the first node according to control of the first control end;
the second bridge arm sub-circuit is configured to switch on or off the voltage input end and the second output end according to the control of the second control end;
the third bridge arm sub-circuit is configured to turn on or off the first node and the ground terminal according to control of the third control terminal;
the fourth bridge arm sub-circuit is configured to turn on or off the second output terminal and the ground terminal according to control of the fourth control terminal;
the protection sub-circuit is configured to control a current between the first node and a first output terminal to be not greater than a preset value.
In an exemplary embodiment, the protection sub-circuit includes a thermistor.
In an exemplary embodiment, the first control terminal and the third control terminal are the same control terminal, and the second control terminal and the fourth control terminal are the same control terminal.
In an exemplary embodiment, the first leg sub-circuit comprises a first fet, the second leg sub-circuit comprises a second fet, the third leg sub-circuit comprises a third fet, and the fourth leg sub-circuit comprises a fourth fet, wherein:
a control electrode of the first field effect transistor is connected with the first control end, a first electrode of the first field effect transistor is connected with the voltage input end, and a second electrode of the first field effect transistor is connected with the first node;
the control electrode of the second field effect transistor is connected with the second control end, the first electrode of the second field effect transistor is connected with the voltage input end, and the second electrode of the second field effect transistor is connected with the second output end;
a control electrode of the third field effect transistor is connected with the third control end, a first electrode of the third field effect transistor is connected with the first node, and a second electrode of the third field effect transistor is connected with the grounding end;
and the control electrode of the fourth field effect transistor is connected with the fourth control end, the first electrode of the fourth field effect transistor is connected with the second output end, and the second electrode of the fourth field effect transistor is connected with the grounding end.
In an exemplary embodiment, the gate circuit is an exclusive or gate, the first normally-closed switch circuit includes a first P-type switch tube, the second normally-closed switch circuit includes a second P-type switch tube, a control electrode of the first P-type switch tube is connected to the fifth control terminal, a first electrode is connected to the first output terminal, a second electrode is connected to the ground terminal, a control electrode of the second P-type switch tube is connected to the fifth control terminal, a first electrode is connected to the second output terminal, and a second electrode is connected to the ground terminal; alternatively, the first and second electrodes may be,
the gate circuit is the same or gate, first normally closed switch circuit includes first N type switch tube, and second normally closed switch circuit includes second N type switch tube, the control pole of first N type switch tube is connected fifth control end, the first pole is connected first output, the second pole is connected the earthing terminal, the control pole of second N type switch tube is connected fifth control end, the first pole is connected second output, the second pole is connected the earthing terminal.
The embodiment of the present disclosure provides an electronic device, which includes the driving circuit described in any one of the above embodiments, and further includes a motor connected between the first output terminal and the second output terminal.
In an exemplary embodiment, the driving circuit includes two driving circuits, namely a first driving circuit and a second driving circuit, described in any of the above embodiments; the motor comprises a first group of coils and a second group of coils, the first group of coils of the motor are connected between the first output end and the second output end of the first driving circuit, and the second group of coils of the motor are connected between the first output end and the second output end of the second driving circuit.
The embodiment of the utility model comprises a driving circuit and electronic equipment. The drive circuit includes: an H-bridge circuit, a first normally closed switch circuit, a second normally closed switch circuit, and a gate circuit, the H-bridge circuit connecting a voltage input terminal, a ground terminal, a first control terminal, a second control terminal, a third control terminal, a fourth control terminal, a first output terminal, and a second output terminal, the gate circuit connecting the first control terminal, the second control terminal, the third control terminal, the fourth control terminal, and a fifth control terminal, the first normally closed switch circuit connecting the fifth control terminal, the first output terminal, and the ground terminal, the second normally closed switch circuit connecting the fifth control terminal, the second output terminal, and the ground terminal, wherein the H-bridge circuit is configured to output a driving current to a driven device connected between the first output terminal and the second output terminal when signals of the first control terminal to the fourth control terminal are combined into a first signal, when the signals from the first control end to the fourth control end are combined into a second signal, stopping outputting the driving current to the driven equipment connected between the first output end and the second output end; the gate circuit is configured to output a first level signal for opening the first normally-closed switch circuit and the second normally-closed switch circuit through a fifth control terminal when the signals from the first control terminal to the fourth control terminal are combined into a first signal. According to the scheme provided by the embodiment, before power is supplied, the first normally closed switch circuit and the second normally closed switch circuit are closed, and reverse electromotive force generated when the driven equipment is manually rotated can be released through the first normally closed switch circuit and the second normally closed switch circuit, so that the equipment is prevented from being damaged.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the example serve to explain the principles of the utility model and not to limit the utility model.
Fig. 1 is a schematic diagram of an H-bridge circuit according to an embodiment;
fig. 2 is a schematic diagram of control signals of an H-bridge circuit according to an embodiment;
fig. 3 is a schematic diagram of a driving circuit provided in an embodiment of the disclosure;
FIG. 4 is a schematic diagram of a driver circuit provided in an exemplary embodiment;
FIG. 5 is a schematic diagram of a driver circuit provided in another exemplary embodiment;
fig. 6 is a schematic diagram of a driving circuit according to yet another exemplary embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Fig. 1 is a circuit diagram of one H-bridge of the dual H-bridge driving circuit. As shown in fig. 1, the H-bridge includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a fourth switching tube Q4, and the high and low levels of the two phases are alternated by inputting different control signals to the control end INA and the control end INB, so as to control different states of the switching tubes in the H-bridge to realize the operation of the motor. Specifically, there are 4 states:
state 1 (braking): the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 are closed;
state 2 (forward power supply): the first switching tube Q1 and the fourth switching tube Q4 are turned on, and the second switching tube Q2 and the third switching tube Q3 are turned off;
state 3 (braking): the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 are closed;
state 4 (reverse power supply): the first switch tube Q1 and the fourth switch tube Q4 are closed, and the second switch tube Q2 and the third switch tube Q3 are turned on.
When the motor M runs, the state 1 to the state 4 are in reciprocating circulation. When the motor commutates, in order to avoid the switch to conduct in common mode, the circuit can have the dead zone. When the motor is driven by using the double H-bridge, a pair of switching tubes on the diagonal line of the H-bridge needs to be switched on, namely, the switching tubes are in a state 2 or a state 4. For example, when the first switch tube Q1 and the fourth switch tube Q4 are turned on, current flows through the motor M from left to right through the voltage input terminal VCC and the first switch tube Q1, and returns to the ground terminal GND through the fourth switch tube Q4, so as to drive the motor M to rotate clockwise, as shown in fig. 1 (a). When the second switch Q2 and the third switch Q3 are turned on, the current flows through the motor M from right to left through the voltage input terminal VCC and the second switch Q2, and returns to the ground terminal GND through the third switch Q3, so as to drive the motor M to rotate counterclockwise, as shown in fig. 1 (b).
FIG. 2 is a schematic diagram of control signals provided in an exemplary embodiment. As shown in fig. 2, INA is a signal input to the control terminal INA, INB is a signal input to the control terminal INB, and INA 'and INB' are signals input to both control terminals of the other H-bridge (not shown) of the double H-bridge, respectively. The other H-bridge is similar to the H-bridge shown in FIG. 1 and will not be described in detail. The motor M may comprise two sets of coils, one of the two H-bridges being connected to a first set of coils of the motor M and the other being connected to a second set of coils of the motor M.
Taking the monitoring device as an example, the monitoring device includes a rotatable sphere, the sphere is controlled by a motor to rotate, and since the inside of the dc motor can be equivalent to an inductor, that is, an inductive load, and both an actual production end and a client end have a situation of manually breaking the sphere before power-on, a reverse electromotive force can be generated and flows through a parasitic diode, so that an output end overshoots, and a risk of breaking down a power tube exists. In addition, when the motor is commutated, the first switching tube Q1 and the fourth switching tube Q4 are turned off to switch to the state 3, or the second switching tube Q2 and the third switching tube Q3 are turned off to switch to the state 1, because the current does not suddenly change, a reverse electromotive force is generated and flows through the parasitic diode of the bridge arm, and the output end overshoots. When the motor is switched to a braking state in a reversing way, instantaneous spikes and oscillation can be generated by an output waveform. In addition, excessive current may also cause motor damage when the supply voltage is unstable.
Fig. 3 is a schematic diagram of a driving circuit according to an embodiment of the disclosure. As shown in fig. 3, the driving circuit provided in this embodiment includes: an H-bridge circuit, a first normally closed switch circuit, a second normally closed switch circuit and a gate circuit, wherein the H-bridge circuit is connected with a voltage input terminal VCC, a ground terminal GND, a first control terminal a1, a second control terminal a2, a third control terminal A3, a fourth control terminal a4, a first output terminal OUT1 and a second output terminal OUT2, the gate circuit is connected with the first control terminal a1, the second control terminal a2, a third control terminal A3, a fourth control terminal a4 and a fifth control terminal a5, the first normally closed switch circuit is connected with the fifth control terminal a5, the first output terminal OUT1 and the ground terminal GND, the second normally closed switch circuit is connected with the fifth control terminal a5, the second output terminal OUT2 and the ground terminal GND,
the H-bridge circuit is configured to output a driving current to a driven device connected between the first output terminal OUT1 and the second output terminal OUT2 when the signals of the first control terminal a1 to the fourth control terminal a4 are combined into a first signal, and stop outputting the driving current to the driven device connected between the first output terminal OUT1 and the second output terminal OUT2 when the signals of the first control terminal a1 to the fourth control terminal a4 are combined into a second signal;
the gate circuit is configured to output a first level signal for opening the first and second normally closed switch circuits through a fifth control terminal a5 when the signals of the first to fourth control terminals a1 to a4 are combined into a first signal;
the first normally-closed switch circuit is configured to turn on or off the first output terminal and the ground terminal GND under the control of the fifth control terminal;
the second normally-closed switch circuit is configured to turn on or off the second output terminal and the ground terminal GND under the control of the fifth control terminal.
Wherein the driven device is, for example, a motor.
The first normally closed switch circuit and the second normally closed switch circuit are in a normally closed state in a power-down state. According to the scheme provided by the embodiment, before power is supplied, the first normally closed switch circuit and the second normally closed switch circuit are closed, and reverse electromotive force generated when the driven device is rotated can be released through the first normally closed switch circuit and the second normally closed switch circuit, so that the effect of protecting the device is achieved.
In an exemplary implementation, the second voltage input terminal VCC is, for example, a power supply terminal.
In an exemplary embodiment, the gate circuit is further configured to output a second level signal for closing the first and second normally closed switch circuits through a fifth control terminal a5 when the signals of the first to fourth control terminals a1 to a4 are combined into a second signal.
When the motor is switched to a braking state in a reversing mode, a reverse electromotive force can be generated and flows through the parasitic diode of the bridge arm, so that the output end overshoots. However, the embodiment of the present disclosure is not limited thereto, and when the signals of the first control end a1 to the fourth control end a4 are combined into the second signal, the gate circuit may output the first level signal for opening the first normally-closed switch circuit and the second normally-closed switch circuit through the fifth control end a5, that is, only the reverse electromotive force in the power-down state may be discharged, and after the power-up state is performed, the first normally-closed switch circuit and the second normally-closed switch circuit are opened.
In an exemplary embodiment, the first level signal may be a high level and the second level signal may be a low level, or the first level signal may be a low level and the second level signal may be a high level.
In an exemplary embodiment, as shown in fig. 4, the H-bridge circuit includes a first bridge leg sub-circuit 41, a second bridge leg sub-circuit 42, a third bridge leg sub-circuit 43 and a fourth bridge leg sub-circuit 44, the first bridge leg sub-circuit 41 is connected to a first control terminal a1, a voltage input terminal VCC and a first output terminal OUT1, the second bridge leg sub-circuit 42 is connected to a second control terminal a2, a first voltage terminal VCC and a second output terminal OUT2, the third bridge leg sub-circuit 43 is connected to a third control terminal A3, a first output terminal OUT1 and a ground terminal GND, the fourth bridge leg sub-circuit 44 is connected to a fourth control terminal a4, a second output terminal OUT2 and the ground terminal GND, wherein:
the first bridge arm sub-circuit 41 is configured to turn on or off the voltage input terminal VCC and the first output terminal OUT1 according to the control of the first control terminal a 1;
the second bridge arm sub-circuit 42 is configured to turn on or off the voltage input terminal VCC and the second output terminal OUT2 according to the control of the second control terminal a 2;
the third bridge arm sub-circuit 43 is configured to turn on or off the first output terminal OUT1 and the ground terminal GND according to the control of the third control terminal a 3;
the fourth bridge leg sub-circuit 44 is configured to turn on or off the second output terminal OUT2 and the ground terminal GND according to the control of the fourth control terminal a 4.
In an exemplary embodiment, as shown in fig. 5, the H-bridge circuit includes a first bridge leg sub-circuit 41, a second bridge leg sub-circuit 42, a third bridge leg sub-circuit 43, a fourth bridge leg sub-circuit 44 and a protection sub-circuit, the first bridge leg sub-circuit 41 is connected to a first control terminal a1, a voltage input terminal VCC and a first node K, the second bridge leg sub-circuit 42 is connected to a second control terminal a2, the voltage input terminal VCC and a second output terminal OUT2, the third bridge leg sub-circuit 43 is connected to a third control terminal A3, a first node K and a ground terminal GND, the fourth bridge leg sub-circuit 44 is connected to a fourth control terminal a4, a second output terminal OUT2 and the ground terminal GND, and the protection sub-circuit is connected between the first node K and the first output terminal OUT1, wherein:
the first bridge arm sub-circuit 41 is configured to turn on or off the voltage input terminal VCC and the first node K according to the control of the first control terminal a 1;
the second bridge arm sub-circuit 42 is configured to turn on or off the voltage input terminal VCC and the second output terminal OUT2 according to the control of the second control terminal a 2;
the third bridge arm sub-circuit 43 is configured to turn on or off the first node K and the ground terminal GND according to the control of the third control terminal a 3;
the fourth leg sub-circuit 44 is configured to turn on or off the second output terminal OUT2 and the ground terminal GND according to the control of the fourth control terminal a 4;
the protection sub-circuit is configured to control a current between the first node K and the first output terminal OUT1 not to be greater than a preset value.
When the supply voltage is unstable, a large current may be generated in the circuit, burning out the load. According to the scheme provided by the embodiment, the protection sub-circuit is arranged to prevent the current from being overlarge, and the protection circuit protects the motor from working normally when the voltage fluctuation is within a normal range. When the voltage fluctuation exceeds the allowable range and the current is overlarge, the circuit is similar to an open circuit state, automatic gain control is realized, the purpose of protecting the motor is achieved, the influence caused by the voltage fluctuation is effectively controlled, the safety of equipment is improved, the realization is simple and convenient, and the applicability is wide. The protection sub-circuit is a recoverable sub-circuit, and recovers a conduction state after the current is reduced.
In an exemplary embodiment, the protection sub-circuit may comprise a thermally sensitive device, such as a thermistor. The resistance of the thermistor can be increased along with the increase of the current, so that when the current reaches a preset value, the resistance is large enough to form an open circuit, and the current-limiting protection is realized. However, the embodiments of the present disclosure are not limited thereto, and may be other circuits that can perform current limiting. In this embodiment, the protection sub-circuit is connected between the first node K and the first output terminal OUT1, and in another embodiment, the protection sub-circuit may be connected before the node K 'and the second output terminal OUT2, i.e., the second output terminal OUT2 is connected with the node K' through the protection sub-circuit.
In an exemplary embodiment, the first control terminal a1 and the third control terminal A3 may be the same control terminal, and the second control terminal a2 and the fourth control terminal a4 may be the same control terminal. That is, first arm sub-circuit 41 and third arm sub-circuit 43 are controlled by the same control signal, and second arm sub-circuit 42 and fourth arm sub-circuit 44 are controlled by the same control signal. The disclosed embodiments are not limited thereto, and the first to fourth control terminals a1 to a4 may be independent control terminals.
In an exemplary implementation, as shown in fig. 4 and 5, the first leg sub-circuit 41 may include a first fet M1, the second leg sub-circuit 42 may include a second fet M2, the third leg sub-circuit 43 may include a third fet M3, and the fourth leg sub-circuit 44 may include a fourth fet M4, wherein:
a control electrode of the first field effect transistor M1 is connected to the first control terminal a1, a first electrode is connected to the voltage input terminal VCC, and a second electrode is connected to the first output terminal OUT1 or a first node K;
a control electrode of the second field effect transistor M2 is connected to the second control terminal a2, a first electrode is connected to the voltage input terminal VCC, and a second electrode is connected to the second output terminal OUT 2;
a control electrode of the third fet M3 is connected to the third control terminal A3, a first electrode is connected to the first output terminal OUT1 or the first node K, and a second electrode is connected to the ground terminal GND;
the control electrode of the fourth fet M4 is connected to the fourth control terminal a4, the first electrode is connected to the second output terminal OUT2, and the second electrode is connected to the ground terminal GND.
According to the scheme provided by the embodiment, the discrete MOS tube is used, and compared with an integrated H-bridge circuit, the discrete MOS tube has higher power and can drive a high-power load. The embodiment of the present disclosure is not limited thereto, and the first bridge arm sub-circuit 41, the second bridge arm sub-circuit 42, the third bridge arm sub-circuit 43, and the fourth bridge arm sub-circuit 44 may have other structures, for example, more switching tubes may be included as long as the corresponding functions can be realized.
The operation state of the driving circuit according to the embodiment of the present disclosure will be described by taking the scheme shown in fig. 4 as an example. In this embodiment, after power-on, the driving circuit includes four states:
state 1 (braking): the first field-effect tube M1, the second field-effect tube M2, the third field-effect tube M3 and the fourth field-effect tube M4 are closed, the first normally-closed switch circuit is closed, and the second normally-closed switch circuit is closed;
state 2 (forward power supply): the first field-effect tube M1 and the fourth field-effect tube M4 are conducted, the second field-effect tube M2 and the third field-effect tube M3 are closed, the first normally-closed switch circuit is opened, and the second normally-closed switch circuit is opened;
state 3 (braking): the first field-effect tube M1, the second field-effect tube M2, the third field-effect tube M3 and the fourth field-effect tube M4 are closed, the first normally-closed switch circuit is closed, and the second normally-closed switch circuit is closed;
state 4 (reverse power supply): the first field effect transistor M1 and the fourth field effect transistor M4 are closed, the second field effect transistor M2 and the third field effect transistor M3 are switched on, the first normally closed switch circuit is opened, and the second normally closed switch circuit is opened.
When the motor is operated, the motor is cycled from the state 1 to the state 4. In the state 1 and the state 3, the reverse electromotive force is discharged through the first normally closed switch circuit and the second normally closed switch circuit.
The first signal combination is, for example, (1,0,1,0), when M1 and M4 are on and M2 and M3 are off, or (0,1,0,1), when M2 and M3 are on and M1 and M4 are off, and the second signal combination is, for example, (0,0,0,0) or (1,1,1,1), where 1 represents high and 0 represents low.
In an exemplary embodiment, the first normally-closed switch circuit and the second normally-closed switch circuit may be implemented by using relays, or may be implemented by using P-type switch tubes or N-type switch tubes.
In an exemplary embodiment, as shown in fig. 5, the gate circuit may be an exclusive or gate, the first normally-closed switch circuit may include a first P-type switch M5, the second normally-closed switch circuit may include a second P-type switch M6, a control electrode of the first P-type switch M5 is connected to the fifth control terminal a5, a first electrode of the first P-type switch M5 is connected to the first output terminal OUT1, a second electrode of the first P-type switch M6 is connected to the ground terminal GND, a first electrode of the second P-type switch M6 is connected to the fifth control terminal a5, and a second electrode of the second P-type switch M6 is connected to the second output terminal OUT2 and the ground terminal GND. The control electrode is, for example, a gate, the first electrode is, for example, a source, and the second electrode is, for example, a drain.
Taking the first control terminal a1 and the third control terminal A3 as the same control terminal, and the second control terminal a2 and the fourth control terminal a4 as the same control terminal, the gate circuit has two input signals, the input signal of the first control terminal a1 and the input signal of the second control terminal a 2.
When the first control terminal a1 inputs a high level and the second control terminal a2 inputs a low level, or the first control terminal a1 inputs a low level and the second control terminal a2 inputs a high level, that is, when the motor operates in a forward or reverse direction, signals of the first control terminal a1 and the second control terminal a2 are input to an exclusive or gate, a high level signal is output to the gates of the first P-type switch tube M5 and the second P-type switch tube M6 through the fifth control terminal a5, and the first P-type switch tube M5 and the second P-type switch tube M6 are in a cut-off state. When the first control end a1 inputs a high level, the second control end a2 inputs a high level, or the first control end a1 inputs a low level, the second control end a2 inputs a low level, that is, the motor is in a braking state, signals of the first control end a1 and the second control end a2 are input to an exclusive or gate, a low level signal is output to the gates of the first P-type switching tube M5 and the second P-type switching tube M6 through the fifth control end a5, the first P-type switching tube M5 and the second P-type switching tube M6 are turned on, and the back electromotive force is connected with the ground through the sources of the first P-type switching tube M5 and the second P-type switching tube M6, so that automatic bleeding is realized. As shown in fig. 5.
In an exemplary embodiment, as shown in fig. 6, the gate circuit may be an exclusive nor gate, the first normally-closed switch circuit includes a first N-type switch M7, the second normally-closed switch circuit includes a second N-type switch M8, a control pole of the first N-type switch M7 is connected to the fifth control terminal a5, a first pole is connected to the first output terminal OUT1, a second pole is connected to the ground terminal GND, a control pole of the second N-type switch M8 is connected to the fifth control terminal a5, a first pole is connected to the second output terminal OUT2, and a second pole is connected to the ground terminal GND.
The first control terminal A1 and the third control terminal A3 are the same control terminal, and the second control terminal A2 and the fourth control terminal A4 are the same control terminal.
When the first control terminal a1 inputs a high level and the second control terminal a2 inputs a low level, or the first control terminal a1 inputs a low level and the second control terminal a2 inputs a high level, that is, when the motor works in the forward direction or the reverse direction, signals of the first control terminal a1 and the second control terminal a2 are input to an exclusive nor gate, a low level signal is output to the gates of the first N-type switch tube M7 and the second N-type switch tube M8 through the fifth control terminal a5, and the first N-type switch tube M7 and the second N-type switch tube M8 are in an off state. When the first control end a1 inputs a high level, the second control end a2 inputs a high level, or the first control end a1 inputs a low level, the second control end a2 inputs a low level, that is, the motor is in a braking state, signals of the first control end a1 and the second control end a2 are input to an exclusive or gate, a high level signal is output to the gates of the first N-type switching tube M7 and the second N-type switching tube M8 through the fifth control end a5, the first N-type switching tube M7 and the second N-type switching tube M8 are turned on, and the reverse electromotive force is connected to the ground through the sources of the first N-type switching tube M7 and the second N-type switching tube M8, so that automatic bleeding is realized. As shown in fig. 6.
The embodiment of the present disclosure provides an electronic device, which includes the driving circuit described in any of the above embodiments, and further includes a motor connected between the first output terminal OUT1 and the second output terminal OUT 2.
In an exemplary embodiment, the electronic device includes two of the above driving circuits, namely a first driving circuit and a second driving circuit, the motor includes a first group of coils and a second group of coils, the first group of coils of the motor is connected between a first output end and a second output end of the first driving circuit, and the second group of coils of the motor is connected between a first output end and a second output end of the second driving circuit.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. A driver circuit, comprising: the H-bridge circuit is connected with a voltage input end, a grounding end, a first control end, a second control end, a third control end, a fourth control end, a first output end and a second output end, the gate circuit is connected with the first control end, the second control end, the third control end, the fourth control end and a fifth control end, the first normally closed switch circuit is connected with the fifth control end, the first output end and the grounding end, the second normally closed switch circuit is connected with the fifth control end, the second output end and the grounding end, wherein,
the H-bridge circuit is configured to output a driving current to a driven device connected between the first output end and the second output end when the signals from the first control end to the fourth control end are combined into a first signal, and stop outputting the driving current to the driven device connected between the first output end and the second output end when the signals from the first control end to the fourth control end are combined into a second signal;
the gate circuit is configured to output a first level signal for opening the first normally closed switch circuit and the second normally closed switch circuit through a fifth control end when the signals from the first control end to the fourth control end are combined into a first signal;
the first normally-closed switch circuit is configured to turn on or off the first output terminal and the ground terminal under the control of the fifth control terminal;
the second normally-closed switch circuit is configured to turn on or off the second output terminal and the ground terminal under the control of the fifth control terminal.
2. The driving circuit according to claim 1, wherein the gate circuit is further configured to output a second level signal for closing the first normally-closed switch circuit and the second normally-closed switch circuit through a fifth control terminal when the signals of the first control terminal to the fourth control terminal are combined into a second signal.
3. The driving circuit of claim 1, wherein the H-bridge circuit comprises a first leg sub-circuit, a second leg sub-circuit, a third leg sub-circuit, and a fourth leg sub-circuit, wherein the first leg sub-circuit is connected to a first control terminal, a voltage input terminal, and a first output terminal, the second leg sub-circuit is connected to a second control terminal, a voltage input terminal, and a second output terminal, the third leg sub-circuit is connected to a third control terminal, a first output terminal, and a ground terminal, and the fourth leg sub-circuit is connected to a fourth control terminal, a second output terminal, and a ground terminal, wherein:
the first bridge arm sub-circuit is configured to switch on or off the voltage input end and the first output end according to the control of the first control end;
the second bridge arm sub-circuit is configured to switch on or off the voltage input end and the second output end according to the control of the second control end;
the third bridge arm sub-circuit is configured to turn on or off the first output terminal and the ground terminal according to control of the third control terminal;
the fourth bridge arm sub-circuit is configured to turn on or off the second output terminal and the ground terminal according to control of the fourth control terminal.
4. The driving circuit of claim 1, wherein the H-bridge circuit comprises a first leg subcircuit, a second leg subcircuit, a third leg subcircuit, a fourth leg subcircuit, and a protection subcircuit, wherein the first leg subcircuit is connected to a first control terminal, a voltage input terminal, and a first node, the second leg subcircuit is connected to a second control terminal, a voltage input terminal, and a second output terminal, the third leg subcircuit is connected to a third control terminal, a first node, and a ground terminal, the fourth leg subcircuit is connected to a fourth control terminal, a second output terminal, and a ground terminal, and the protection subcircuit is connected between the first node and the first output terminal, wherein:
the first bridge arm sub-circuit is configured to turn on or off the voltage input end and the first node according to control of the first control end;
the second bridge arm sub-circuit is configured to switch on or off the voltage input end and the second output end according to the control of the second control end;
the third bridge arm sub-circuit is configured to turn on or off the first node and the ground terminal according to control of the third control terminal;
the fourth bridge arm sub-circuit is configured to turn on or off the second output terminal and the ground terminal according to control of the fourth control terminal;
the protection sub-circuit is configured to control a current between the first node and the first output terminal to be not greater than a preset value.
5. The driving circuit of claim 4, wherein the protection sub-circuit comprises a thermistor.
6. The driving circuit according to any one of claims 3 to 5, wherein the first control terminal and the third control terminal are the same control terminal, and the second control terminal and the fourth control terminal are the same control terminal.
7. The driving circuit according to claim 4 or 5, wherein the first leg sub-circuit comprises a first field effect transistor, the second leg sub-circuit comprises a second field effect transistor, the third leg sub-circuit comprises a third field effect transistor, and the fourth leg sub-circuit comprises a fourth field effect transistor, wherein:
a control electrode of the first field effect transistor is connected with the first control end, a first electrode of the first field effect transistor is connected with the voltage input end, and a second electrode of the first field effect transistor is connected with the first node;
the control electrode of the second field effect transistor is connected with the second control end, the first electrode of the second field effect transistor is connected with the voltage input end, and the second electrode of the second field effect transistor is connected with the second output end;
a control electrode of the third field effect transistor is connected with the third control end, a first electrode of the third field effect transistor is connected with the first node, and a second electrode of the third field effect transistor is connected with the grounding end;
and the control electrode of the fourth field effect transistor is connected with the fourth control end, the first electrode of the fourth field effect transistor is connected with the second output end, and the second electrode of the fourth field effect transistor is connected with the grounding end.
8. The driving circuit according to any one of claims 1 to 5, wherein the gate circuit is an exclusive-or gate, the first normally-closed switching circuit includes a first P-type switching transistor, the second normally-closed switching circuit includes a second P-type switching transistor, a control electrode of the first P-type switching transistor is connected to the fifth control terminal, a first electrode of the first P-type switching transistor is connected to the first output terminal, a second electrode of the first P-type switching transistor is connected to the ground terminal, a control electrode of the second P-type switching transistor is connected to the fifth control terminal, a first electrode of the second P-type switching transistor is connected to the second output terminal, and a second electrode of the second P-type switching transistor is connected to the ground terminal; alternatively, the first and second electrodes may be,
the gate circuit is with the OR gate, first normally closed switch circuit includes first N type switch tube, and second normally closed switch circuit includes second N type switch tube, the control pole of first N type switch tube is connected fifth control end, the first pole is connected first output, the second pole is connected the earthing terminal, the control pole of second N type switch tube is connected fifth control end, the first pole is connected the second output, the second pole is connected the earthing terminal.
9. An electronic device comprising a drive circuit as claimed in any one of claims 1 to 8, and further comprising a motor connected between the first output terminal and the second output terminal.
10. The electronic device according to claim 9, wherein the driver circuit according to any one of claims 1 to 8 comprises: comprising two driver circuits according to any of claims 1 to 8, a first driver circuit and a second driver circuit, respectively; the motor comprises a first group of coils and a second group of coils, the first group of coils of the motor are connected between the first output end and the second output end of the first driving circuit, and the second group of coils of the motor are connected between the first output end and the second output end of the second driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122998328.5U CN216721212U (en) | 2021-11-30 | 2021-11-30 | Drive circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122998328.5U CN216721212U (en) | 2021-11-30 | 2021-11-30 | Drive circuit and electronic equipment |
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|---|---|
| CN216721212U true CN216721212U (en) | 2022-06-10 |
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| CN202122998328.5U Active CN216721212U (en) | 2021-11-30 | 2021-11-30 | Drive circuit and electronic equipment |
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| CN (1) | CN216721212U (en) |
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- 2021-11-30 CN CN202122998328.5U patent/CN216721212U/en active Active
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