Driving circuit, power device and driving device

Abstract

The utility model discloses a driving circuit, a power device and a driving device, and relates to the technical field of driving, and the driving circuit comprises a control unit and a plurality of power modules. The power modules are connected in parallel and then connected with a load, the power modules are further connected with the control unit, and the control unit and the power modules are further connected with a power supply. When the control unit detects that the power supply current value of the power supply signal output by the power supply is lower than a preset current value, a control signal is sent to any power module; the power module sends a driving signal to a load when receiving the control signal and the power supply signal. When it is detected that only small current is needed to drive the load, a single power module of a certain channel is independently controlled to drive the load, and the rest power modules connected in parallel are kept not working, so that the power loss of the power modules connected in parallel in the small current driving mode is reduced, the average on-off frequency of the power modules in the small current driving mode is also reduced, and the service life of the power modules is prolonged. And the service life of the power module is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of drive technology, in particular to a drive circuit, a power device and a drive device. Background Art

[0002] In the existing driving circuit, when a large current is used to drive the load, multiple power modules are often required to be connected in parallel to form multiple channels. The load is driven to work by synchronously transmitting current through multiple channels, which can reduce the overall conduction loss of the power module, thereby reducing the overall power loss of each power module. In actual situations, multiple power modules connected in parallel will increase the overall cut-off capacitance loss. When a small current is used to drive the load, the cut-off capacitance loss will increase sharply, which will increase the overall power loss. At this time, using a single power module with a single channel to drive the load can better reduce the overall power loss. However, the method of synchronously driving the load in a multi-channel manner generally requires that the control ends corresponding to each channel are connected to the same node, and the on and off of each channel are synchronously controlled by the same control signal, which cannot reduce the overall power loss generated when the load is driven by a small current. Utility Model Content

[0003] The main purpose of the utility model is to provide a driving circuit, a power device and a driving device, aiming to solve the technical problem in the prior art of how to reduce the overall power loss generated when multiple power modules of multiple channels transmit small currents to drive loads.

[0004] To achieve the above-mentioned purpose, an embodiment of the utility model provides a driving circuit, the driving circuit comprising: a control unit and a plurality of power modules;

[0005] The power modules are connected in parallel to a load, and are also connected to the control unit. The control unit and the power modules are also connected to a power supply.

[0006] The control unit is configured to send a control signal to any one of the power modules when it is detected that the power supply current value of the power supply signal output by the power supply is lower than a preset current value;

[0007] The power module is used to send a driving signal to the load when receiving the control signal and the power supply signal.

[0008] Optionally, the power module includes: a first switch unit and a second switch unit;

[0009] The first end of the first switch unit is connected to the positive electrode of the power supply, the second end of the first switch is respectively connected to the first end of the second switch unit and the load, and the second end of the second switch is connected to the negative electrode of the power supply; the control end of the first switch unit and the control end of the second switch unit are both connected to the control unit;

[0010] The first switch unit and the second switch unit are used to change their respective conduction states and send the drive signal to the load when receiving the control signal.

[0011] Optionally, the first switch unit includes: a plurality of N-MOSFET tubes;

[0012] The source of each N-MOSFET tube is connected to the positive electrode of the power supply, the drain of each N-MOSFET tube is connected to the first end of the corresponding second switch unit and the load, and the gate of each N-MOSFET tube is connected to the first end of the control unit;

[0013] The control unit includes a plurality of first terminals, each of which is correspondingly connected to a control terminal of the first switch unit.

[0014] Optionally, the second switch unit includes: a plurality of N-MOSFET tubes;

[0015] The source of each N-MOSFET tube is connected to the second end of the corresponding first switch unit and the load, the drain of each N-MOSFET tube is connected to the negative electrode of the power supply, and the gate of each N-MOSFET tube is connected to the second end of the control unit;

[0016] The control unit includes a plurality of second terminals, each of which is correspondingly connected to a control terminal of the second switch unit.

[0017] Optionally, each of the N-MOSFET tubes is a SiC-MOSFET tube.

[0018] Optionally, the control unit is further configured to send the control signal to each of the power modules in sequence when it is detected that the power supply current value is lower than the preset current value, so that each of the power modules drives the load alternately.

[0019] Optionally, the control unit is further configured to send the control signal to each of the power modules in sequence at a preset period, so that each of the power modules drives the load in sequence according to the preset period.

[0020] Optionally, the control unit is further configured to send the control signal to each of the power modules when it is detected that the power supply current value is higher than the preset current value, so that each of the power modules drives the load together.

[0021] In addition, to achieve the above-mentioned purpose, an embodiment of the present utility model further provides a power device, and the power device adopts the driving circuit as described above.

[0022] In addition, to achieve the above-mentioned purpose, an embodiment of the present utility model further proposes a driving device, which adopts the power device described above.

[0023] The embodiment of the utility model proposes a driving circuit, a power device and a driving device, wherein the driving circuit comprises: a control unit and a plurality of power modules; each of the power modules is connected to a load after being connected in parallel, each of the power modules is also connected to the control unit respectively, and the control unit and each of the power modules are also connected to a power supply; the control unit is used to send a control signal to any one of the power modules when it is detected that the power supply current value of the power supply signal output by the power supply is lower than a preset current value; the power module is used to send a driving signal to the load when receiving the control signal and the power supply signal. The control unit independently controls each power module connected in parallel to work, and when it is detected that only a small current is needed to drive the load, a single power module of a certain channel is controlled to transmit current to drive the load to work, while the remaining power modules are kept not working, which not only reduces the power loss of each power module of the multi-channel in the small current driving mode, but also reduces the average number of on and off times of each power module in the small current driving mode, thereby extending the service life of the power module, that is, extending the service life of the driving circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of the first embodiment of the drive circuit of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the second embodiment of the driving circuit of the utility model;

[0026] Figure 3 A timing diagram of a control signal received by a single power module in a low current driving mode;

[0027] Figure 4 A timing diagram of a control signal received by multiple power modules in a low current driving mode;

[0028] Figure 5 A timing diagram of another control signal received by multiple power modules in a low current driving mode;

[0029] Figure 6 The figure is a timing diagram of a control signal received by multiple power modules in a high current driving mode. DETAILED DESCRIPTION

[0030] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0031] The utility model embodiment provides a driving circuit, referring to Figure 1 , Figure 1 It is a schematic structural diagram of the first embodiment of the driving circuit of the utility model.

[0032] refer to Figure 1 , In this embodiment, the driving circuit includes: a control unit 10 and a plurality of power modules 20;

[0033] The power modules 20 are connected in parallel to a load 30, and are also connected to the control unit 10, respectively. The control unit 10 and the power modules 20 are also connected to a power supply 40.

[0034] The control unit 10 is used to send a control signal to any one of the power modules 20 when it is detected that the power supply current value of the power supply signal output by the power supply 40 is lower than a preset current value;

[0035] The power module 20 is used to send a driving signal to the load 30 when receiving the control signal and the power supply signal.

[0036] It should be understood that, in the present embodiment, the load 30 can be the same type of electrical appliance or different electrical appliances. When the load 30 is different electrical appliances, each type of electrical appliance has different driving requirements, which can be divided according to the size of the driving current and can be summarized as the driving requirements of large current driving and small current driving. The load 30 can also be the same type of electrical appliance, which also has different driving requirements in different working modes, which can also be summarized as the driving requirements of large current driving and small current driving. Corresponding to the above two driving requirements, the working mode of the driving circuit at least includes a large current driving mode and a small current driving mode.

[0037] It should be noted that, in this embodiment, the control signal refers to a signal for controlling the on / off state of a single power module 20, which can be composed of one or more pairs of electrical signals. When the power module 20 receives the power supply signal output by the power supply 40, each power module 20 can continuously adjust the on / off state according to the received control signal, and send a corresponding drive signal to the load 30 based on the continuously adjusted on / off state, thereby driving the load 30 to perform corresponding work.

[0038] It is worth noting that in the present embodiment, each power module 20 is arranged in parallel with each other and is independently connected to the control unit 10. Therefore, the control unit 10 can independently send a control signal to one power module 20 or several power modules 20 among the multiple power modules 20 without affecting the on / off state of other power modules 20. Each power module 20 can be freely selected to drive the load 30 in a single-channel or multi-channel manner.

[0039] It is easy to understand that the control unit 10 can receive the power supply signal output by the power supply 40, and detect the power supply current value corresponding to the power supply signal. When the power supply current value is detected to be lower than the preset current value, it is determined that the working mode of the current load 30 is the low current driving mode, and only the control signal is sent to any one of the power modules 20, so that it independently drives the load 30. In this case, only a single power module 20 of a single channel continuously changes the on-off state, and the other on-off power modules do not work, thereby greatly reducing the capacitance loss generated when each power module 20 is working, that is, reducing the overall power loss generated by the drive circuit in the low current driving mode. In addition, in the low-current working mode, the control unit 10 does not always send the control signal to a specific power module 20, so that the specific power module 20 is always in working state, but sends the control signal to each power module 20 randomly and separately in different time periods, so that each power module 20 randomly drives the load 30 independently in a specific time period, avoiding the aging and scrapping of a specific driving module in the driving circuit due to excessive working time, thereby reducing the situation where a single driving module of the driving circuit is aged and scrapped and cannot drive the load 30 in the high-current driving mode. It is achieved that each power module 20 of the multi-channel can be compatible with the high-current driving mode and the low-current driving mode, and at the same time, the average working time of each power module 20 is reduced, and the service life of the driving circuit is increased.

[0040] The embodiment of the utility model proposes a driving circuit, which includes: a control unit and a plurality of power modules; each of the power modules is connected in parallel to a load, each of the power modules is also connected to the control unit, and the control unit and each of the power modules are also connected to a power supply; the control unit is used to send a control signal to any one of the power modules when it is detected that the power supply current value of the power supply signal output by the power supply is lower than a preset current value; the power module is used to send a driving signal to the load when receiving the control signal and the power supply signal. The control unit independently controls each power module connected in parallel to work, and when it is detected that only a small current is needed to drive the load, a single power module of a certain channel is controlled to transmit current to drive the load to work, while the remaining power modules are kept not working, which not only reduces the power loss of each power module of the multi-channel in the small current driving mode, but also reduces the number of on and off times of the power module in the small current driving mode, and prolongs the service life of the power module, that is, prolongs the service life of the driving circuit.

[0041] Based on the first embodiment of the driving circuit of the utility model, a second embodiment of the driving circuit of the utility model is proposed. Figure 2 , Figure 2 It is a schematic structural diagram of the second embodiment of the driving circuit of the utility model.

[0042] like Figure 2 As shown, in this embodiment, the power module 20 includes: a first switch unit 21 and a second switch unit 22;

[0043] The first end of the first switch unit 21 is connected to the positive electrode of the power supply 40, the second end of the first switch is respectively connected to the first end of the second switch unit 22 and the load 30, and the second end of the second switch is connected to the negative electrode of the power supply 40; the control end of the first switch unit 21 and the control end of the second switch unit 22 are both connected to the control unit 10;

[0044] The first switch unit 21 and the second switch unit 22 are used to change their respective conduction states and send the driving signal to the load 30 when receiving the control signal.

[0045] It should be noted that, in this embodiment, the control signal is a pair of electrical signals, which respectively control the on-off state of the first switch unit 21 and the second switch unit 22. The first switch unit 21 and the second switch unit 22 form a half-bridge circuit, and the DC signal output by the power supply 40 can be converted into an AC signal for driving the load 30, that is, a driving signal, by controlling the on-off state of the first switch unit 21 and the second switch unit 22.

[0046] It is easy to understand that in a specific implementation, the control signal includes G H1 and G L1 ,refer to Figure 3 , Figure 3 1 is a timing diagram of a control signal received by a single power module in a low current driving mode. In the low current driving mode, during a working cycle of a single power module 20 driving a load 30 after receiving the control signal, the timing of the control signal is as follows: Figure 3 As shown. The first switch unit 21 receives the G signal sent by the control unit 10. H1 The control changes the on-off state when G H1 When G is high, the first switch unit 21 enters the on state; H1 When G is low, the first switch unit 21 enters the off state. Similarly, the second switch unit 22 is L1 The control changes the on-off state when G L1 When G is high, the first switch unit 21 enters the on state; L1 When the first switch unit 21 and the second switch unit 22 receive Figure 3 When the control signal of the timing shown is output, a small current, AC driving signal can be output to the load 30 to drive the load 30 to work normally.

[0047] Further, in this embodiment, the first switch unit 21 includes: a plurality of N-MOSFET tubes Q0;

[0048] The source of each N-MOSFET tube Q0 is connected to the positive electrode of the power supply 40, the drain of each N-MOSFET tube Q0 is connected to the first end of the corresponding second switch unit 22 and the load 30, and the gate of each N-MOSFET tube Q0 is connected to the first end of the control unit 10;

[0049] The control unit 10 includes a plurality of first terminals, each of which is correspondingly connected to a control terminal of the first switch unit 21 .

[0050] It is easy to understand that the first switch unit 21 can be composed of multiple N-MOSFET tubes Q0 connected in parallel, the source of each N-MOSFET tube Q0 is all connected to the positive electrode of the power supply 40; the gate of each N-MOSFET tube Q0 is all connected to one of the first terminals of the control unit 10; the source of each N-MOSFET tube Q0 is all connected to the negative electrode of the power supply 40. By connecting multiple N-MOSFET tubes Q0 in parallel, each N-MOSFET tube Q0 can simultaneously receive the control signal sent by the control unit 10, and realize simultaneous conduction or simultaneous cutoff. When conducting at the same time, the working current of each N-MOSFET tube Q0 is shared, the power consumption and heat generation of each N-MOSFET tube Q0 are reduced, and the stability and reliability of the first switch unit 21 are improved.

[0051] In addition, the parallel N-MOSFET tube Q0 can also improve the response speed of the first switch unit 21, reduce switching loss and conduction voltage drop, improve the working efficiency of the power device, and achieve greater power output and higher current handling capacity.

[0052] It should be noted that, in this embodiment, the control unit 10 includes multiple first ends, and each first end of the control unit 10 corresponds to a first switch unit 21 in a power module 20. It can also be understood that each first end of the control unit 10 corresponds to a gate of multiple N-MOSFET tubes Q0 connected to a first switch unit 21.

[0053] It is worth noting that in order to ensure that the driving capability of the corresponding channels of each driving module in the driving circuit is uniform and stable, the number of N-MOSFET tubes Q0 in the first switch unit 21 of each driving module in the same driving circuit should be equal.

[0054] Further, in this embodiment, the second switch unit 22 includes: a plurality of N-MOSFET tubes Q0;

[0055] The source of each N-MOSFET tube Q0 is connected to the second end of the corresponding first switch unit 21 and the load 30, the drain of each N-MOSFET tube Q0 is connected to the negative electrode of the power supply 40, and the gate of each N-MOSFET tube Q0 is connected to the second end of the control unit 10;

[0056] The control unit 10 includes a plurality of second terminals, each of which is correspondingly connected to a control terminal of the second switch unit 22 .

[0057] It is easy to understand that the second switch unit 22 can also be composed of multiple N-MOSFET tubes Q0 connected in parallel, the source of each N-MOSFET tube Q0 is all connected to the positive electrode of the power supply 40; the gate of each N-MOSFET tube Q0 is all connected to one of the second ends of the control unit 10; the source of each N-MOSFET tube Q0 is all connected to the negative electrode of the power supply 40. By connecting multiple N-MOSFET tubes Q0 in parallel, each N-MOSFET tube Q0 can simultaneously receive the control signal sent by the control unit 10, and realize simultaneous conduction or simultaneous cutoff. When conducting at the same time, the working current of each N-MOSFET tube Q0 is shared, the power consumption and heat generation of each N-MOSFET tube Q0 are reduced, and the stability and reliability of the second switch unit 22 are improved.

[0058] In addition, the parallel N-MOSFET tube Q0 can also improve the response speed of the second switch unit 22, reduce switching loss and conduction voltage drop, improve the working efficiency of the power device, and achieve greater power output and higher current handling capacity.

[0059] It should be noted that, in this embodiment, the control unit 10 also includes multiple second ends, and each second end of the control unit 10 corresponds to a second switch unit 22 in a power module 20. It can also be understood that each second end of the control unit 10 corresponds to a gate of multiple N-MOSFET tubes Q0 connected to a second switch unit 22.

[0060] It is worth noting that in order to ensure that the driving capabilities of the corresponding channels of each driving module in the driving circuit are uniform and stable, the number of N-MOSFET tubes Q0 included in the second switch unit 22 of each driving module in the same driving circuit should be equal, and should also be equal to the number of N-MOSFET tubes Q0 included in the first switch unit 21.

[0061] Furthermore, in this embodiment, each of the N-MOSFET tubes Q0 is a SiC-MOSFET tube.

[0062] It is easy to understand that the main material of SiC-MOSFET tube is SiC. Compared with conventional MOSFET tube, SiC-MOSFET tube has the characteristics of high withstand voltage and low impedance, small recovery loss of internal body diode, and no tail current. It can be driven under high frequency conditions and has low requirements for the operating frequency of the control signal. Therefore, the use of SiC-MOSFET tube can reduce the switching loss of the first switch unit 21 and the second switch unit 22, thereby reducing the overall power loss of the drive circuit. In addition, SiC-MOSFET tube is packaged in a small package, and its packaged chip is smaller in size, which can achieve better heat dissipation effect.

[0063] Furthermore, in this embodiment, the control unit 10 is also used to send the control signal to each of the power modules 20 in sequence when it is detected that the power supply current value is lower than the preset current value, so that each of the power modules 20 drives the load 30 alternately.

[0064] It should be noted that, as a situation in this embodiment, reference Figure 2 and Figure 4 , Figure 4 2 is a timing diagram of a control signal received by multiple power modules in a low current driving mode. In this embodiment, the driving circuit includes two power modules 20. Correspondingly, the control signal at least includes G H1 , G L1 , G H2 and G L2 , G H1 Correspondingly controlling the on / off state of the first switch unit 21 in one of the power modules 20, G L1 Correspondingly controlling the on / off state of the second switch unit 22 in the corresponding power module 20; G H2 Correspondingly, the on / off state of the first switch unit 21 in another power module 20 is controlled, G L2 The on-off state of the second switch unit 22 in the corresponding power module 20 is controlled accordingly.

[0065] It is easy to understand that when the low current driving mode is adopted, each working cycle of the load 30 can be divided into a first working cycle and a second working cycle. In the first working cycle, the control unit 10 only controls G H1 and G L1 The high and low levels of G H2 and G L2 Always keep the low level state, that is, the first power module 20 independently drives the load 30, and the second power module 20 does not work; after the first working cycle ends, the second working cycle is performed, and the control unit 10 only controls G H2 and G L2 The high and low levels of G H1 and G L1 The low level state is always maintained, that is, the second power module 20 independently drives the load 30, while the first power module 20 does not work. The two power modules 20 independently drive the load 30 alternately in the order of the working cycle. In this way, after each working cycle, the working time of each power module 20 and the number of on-off state changes are basically consistent, ensuring that the remaining service life of each power module is basically the same, and extending the overall service life of the drive circuit.

[0066] Furthermore, in this embodiment, the control unit 10 is further configured to sequentially send the control signal to each of the power modules 20 at a preset period, so that each of the power modules 20 sequentially drives the load 30 at the preset period.

[0067] It should be noted that, as another situation in this embodiment, refer to Figure 2 and Figure 5 , Figure 5 is a timing diagram of another control signal received by multiple power modules in a low current driving mode. In this embodiment, the driving circuit may include four power modules 20. Correspondingly, the control signal at least includes G H1 , G L1 , G H2 , G L2 , G H3 , G L3 , G H4 and G L4 , similar to the above situation, G H1 and G L1 , G H2 and G L2 , G H3 and G L3 , G H4 and G L4 Control the on and off state of each power module respectively.

[0068] It should be noted that when the low current driving mode is adopted, there may still be a certain power module with abnormal working phenomenon. At this time, the control unit 10 can set the cycle period of the control signal sent to each power module 20 to a preset period. Among them, the preset period of the control unit 10 with abnormal working phenomenon can be 0, that is, the control unit 10 with abnormal working phenomenon is temporarily removed, and the control signal is sent to the power module 20 without abnormal phenomenon with the newly established preset period, so that each power module 20 drives the load 30 independently in sequence according to the preset period.

[0069] It is easy to understand that, in a specific implementation, each working cycle of the load 30 can be divided into four working cycles. Similar to the above situation, in the first working cycle, the control unit 10 only controls G H1 and G L1 The high and low levels of G H2 , G L2 , G H3 , G L3 , G H4 and G L4Always keep the low level state, that is, the first power module 20 independently drives the load 30, and the second to fourth power modules 20 do not work; after the first working cycle ends, the second working cycle is performed, and the control unit 10 only controls G H2 and G L2 The high and low levels of G H1 , G L1 , G H3 , G L3 , G H4 and G L4 Always keep low level state, that is, the second power module 20 drives the load 30 independently, while the first, third and fourth power modules 20 do not work, and so on. If the third power module works abnormally, that is, G H3 and G L3 If the corresponding controlled power module cannot drive the load 30 to work normally, the preset period of the third working cycle can be set to 0, and the preset periods of other working cycles remain unchanged. At this time, in each working cycle of the load 30, the first working cycle, the second working cycle and the fourth working cycle are performed in sequence, and the driving circuit can still be used normally, avoiding the failure of individual power modules 20 to drive the load 30 normally in the low current driving mode, thereby reducing losses.

[0070] Furthermore, in this embodiment, the control unit 10 is also used to send the control signal to each of the power modules 20 when it is detected that the power supply current value is higher than the preset current value, so that each of the power modules 20 drives the load 30 together.

[0071] It should be noted that the reference Figure 6 , Figure 6 1 is a timing diagram of a control signal received by multiple power modules in a high current driving mode. In this embodiment, two power modules may be included, and correspondingly, the control signal includes at least G H1 , G L1 , G H2 and G L2 , G H1 Correspondingly controlling the on / off state of the first switch unit 21 in one of the power modules 20, G L1 Correspondingly controlling the on / off state of the second switch unit 22 in the corresponding power module 20; G H2 Correspondingly, the on / off state of the first switch unit 21 in another power module 20 is controlled, G L2 The on-off state of the second switch unit 22 in the corresponding power module 20 is controlled accordingly.

[0072] It is easy to understand that when the control unit 10 detects that the power supply current value output by the power supply signal is higher than the preset current value, it determines that the current working mode is the high current drive mode. The control unit 10 can send the same control signal to each power module 20 at the same time, so that each power module 20 can adjust the on and off state synchronously, and each power module 20 can transmit a large current to the load 30, so that the load 30 receives a large current, AC drive signal to drive the load 30 to work normally in the high current drive mode. Among them, G H1 With G H2 , G L1 With G L2 The high and low levels always remain the same.

[0073] To achieve the above-mentioned purpose, the embodiment of the utility model further proposes a power device, which adopts all the technical solutions of all the embodiments of the driving circuit as described above. Since the power device of the embodiment of the utility model adopts all the technical solutions of all the embodiments of the driving circuit as described above, it at least has all the beneficial effects of the driving circuit described above, which will not be described one by one here.

[0074] To achieve the above-mentioned purpose, an embodiment of the utility model further proposes a driving device, which adopts all the technical solutions of all the embodiments of the power device as described above. Since the driving device of the embodiment of the utility model adopts all the technical solutions of all the embodiments of the power device as described above, it at least has all the beneficial effects of the power device as described above, which will not be described one by one here.

[0075] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A driving circuit, characterized in that: The driving circuit comprises: a control unit and a plurality of power modules; The power modules are connected in parallel to a load, and are also connected to the control unit. The control unit and the power modules are also connected to a power supply. The control unit is configured to send a control signal to any one of the power modules when it is detected that the power supply current value of the power supply signal output by the power supply is lower than a preset current value; The power module is used to send a driving signal to the load when receiving the control signal and the power supply signal.

2. The driving circuit according to claim 1, characterized in that: The power module comprises: a first switch unit and a second switch unit; The first end of the first switch unit is connected to the positive electrode of the power supply, the second end of the first switch is respectively connected to the first end of the second switch unit and the load, and the second end of the second switch is connected to the negative electrode of the power supply; the control end of the first switch unit and the control end of the second switch unit are both connected to the control unit; The first switch unit and the second switch unit are used to change their respective conduction states and send the drive signal to the load when receiving the control signal.

3. The driving circuit according to claim 2, characterized in that: The first switch unit includes: a plurality of N-MOSFET tubes; The source of each N-MOSFET tube is connected to the positive electrode of the power supply, the drain of each N-MOSFET tube is connected to the first end of the corresponding second switch unit and the load, and the gate of each N-MOSFET tube is connected to the first end of the control unit; The control unit includes a plurality of first terminals, each of which is correspondingly connected to a control terminal of the first switch unit.

4. The driving circuit according to claim 2, characterized in that: The second switch unit includes: a plurality of N-MOSFET tubes; The source of each N-MOSFET tube is connected to the second end of the corresponding first switch unit and the load, the drain of each N-MOSFET tube is connected to the negative electrode of the power supply, and the gate of each N-MOSFET tube is connected to the second end of the control unit; The control unit includes a plurality of second terminals, each of which is correspondingly connected to a control terminal of the second switch unit.

5. The driving circuit according to claim 3 or 4, characterized in that: Each of the N-MOSFET tubes is a SiC-MOSFET tube.

6. The driving circuit according to claim 1, characterized in that: The control unit is further configured to send the control signal to each of the power modules in sequence when detecting that the power supply current value is lower than the preset current value, so that each of the power modules drives the load alternately.

7. The driving circuit according to claim 6, characterized in that: The control unit is further used to send the control signal to each of the power modules in sequence at a preset period, so that each of the power modules drives the load in sequence according to the preset period.

8. The driving circuit according to claim 1, characterized in that: The control unit is further configured to send the control signal to each of the power modules when it is detected that the power supply current value is higher than the preset current value, so that each of the power modules drives the load together.

9. A power device, characterized in that: The power device adopts the driving circuit as described in any one of claims 1-8.

10. A driving device, characterized in that: The driving device adopts the power device as claimed in claim 9.

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