A driving circuit and a driving device

Abstract

The utility model discloses a kind of driving circuit and driving device. Driving circuit includes: first switch module, first switch module is connected between power supply end and load;Current sampling module, current sampling module is connected between load and ground terminal, current sampling module is used to generate sampling voltage according to the current of load flow;First drive module, it is connected between the control end of current sampling module and first switch module, for output initial level signal;Initial level signal is used to control first switch module to turn on or turn off;Second drive module, it is connected between the control end of current sampling module and first switch module, for output maintaining level signal;Maintaining level signal is used to control first switch module to turn on or turn off;Control module, with first drive module and second drive module are connected, control module is used to turn on first drive module or second drive module. The utility model embodiment improves the driving effect of driving circuit.

Description

Technical Field

[0001] This utility model relates to the field of circuit driving technology, and in particular to a driving circuit and driving device. Background Technology

[0002] During operation, contactors are subject to complex usage scenarios, including real-time changes in ambient temperature or input voltage. These changes cause variations in the current flowing through the contactor, which in turn alters the contactor coil's engagement strength, thus affecting its normal operation. However, existing drive circuits provide poor driving performance when operating contactors. Utility Model Content

[0003] This invention provides a driving circuit and a driving device to solve the problem of poor reliability of driving circuits.

[0004] According to one aspect of the present invention, a driving circuit is provided, comprising:

[0005] The first switch module is connected between the power supply and the load;

[0006] A current sampling module is connected between the load and the ground terminal, and the current sampling module is used to generate a sampling voltage based on the current flowing out of the load;

[0007] The first driving module is connected between the control terminals of the current sampling module and the first switching module, and is used to output an initial level signal; the initial level signal is used to control the first switching module to be turned on or off.

[0008] The second drive module is connected between the current sampling module and the control terminal of the first switch module, and is used to output a sustaining level signal; the sustaining level signal is used to control the first switch module to be turned on or off.

[0009] A control module is connected to the first drive module and the second drive module, and the control module is used to turn on the first drive module or the second drive module.

[0010] Optionally, the first driving module includes:

[0011] A comparator and a first switching switch are provided. The first input terminal of the comparator is connected to a reference signal. The second input terminal of the comparator is connected to the output terminal of the current sampling module. The output terminal of the comparator is connected to the first terminal of the first switching switch. The second terminal of the first switching switch is connected to the control terminal of the first switching module. The control terminal of the first switching switch is connected to the control module.

[0012] Optionally, the second drive module includes:

[0013] The logic unit and the second switch are provided. The first end of the logic unit is connected to the output end of the current sampling module, the second end of the logic unit is connected to the first end of the second switch, and the second end of the second switch is connected to the control end of the first switch module.

[0014] Optionally, the current sampling module includes: a sampling resistor and a current sampling unit;

[0015] The first end of the sampling resistor is connected to the second end of the load, the second end of the sampling resistor is grounded, the current sampling unit is connected in parallel between the first and second ends of the sampling resistor, the output end of the current sampling unit serves as the output end of the current sampling module, and the current sampling unit is used to generate the sampling voltage.

[0016] Optionally, the control module includes: a delay unit connected to the first drive module and the second drive module;

[0017] The delay unit is used to turn on the first driving module within a first time period and turn on the second driving module after the first time period.

[0018] Optionally, the driving circuit further includes:

[0019] The second switching module has a first terminal connected to the second terminal of the load, a second terminal connected to the first terminal of the sampling resistor, and a control terminal connected to the second driving module. The second driving module is used to output a hold-level signal and control the second switching module to be turned on or off.

[0020] The first diode has its first end connected to the first end of the load and its second end connected to the second end of the sampling resistor. The first diode is used to freewheel the current flowing out of the load. The off-time of the second switching module is positively correlated with the freewheeling time.

[0021] Optionally, the driving circuit further includes:

[0022] A drive control module is provided, wherein a first input terminal of the drive control module is connected to the output terminal of the first drive module and the first output terminal of the second drive module, and a first output terminal of the drive control module is connected to the control terminal of the first switch module; the drive control module is used to drive the first switch module to turn on or off according to the initial level signal or the sustaining level signal.

[0023] The second input terminal of the drive control module is connected to the second output terminal of the second drive module, and the second output terminal of the drive control module is connected to the control terminal of the second switch module; the drive control module is also used to drive the second switch module to turn on or off according to the holding level signal.

[0024] Optionally, the drive control module includes: a first signal drive unit, a second signal drive unit, and a transmission chip;

[0025] The transmission chip includes: a first input interface, a second input interface, a first output interface, an amplification interface, and a second output interface;

[0026] The amplification interface is connected to the second power supply terminal; the first input interface is connected to the output terminal of the first drive module and the first output terminal of the second drive module; the first output interface is connected to the first terminal of the first signal drive unit; and the second terminal of the first signal drive unit is connected to the control terminal of the first switch module.

[0027] The second input interface is connected to the second output terminal of the second drive module, the second output interface is connected to the first terminal of the second signal drive unit, and the second terminal of the second signal drive unit is connected to the control terminal of the second switch module.

[0028] Optionally, the load includes a contactor coil.

[0029] According to another aspect of the present invention, a driving device is provided, comprising: the driving circuit provided in any embodiment of the present invention.

[0030] The technical solution provided by this embodiment of the invention, by setting a first driving module, can quickly regulate the load current during the power-on phase of the load, keeping the load current stable. After the load is powered on, a second driving module maintains the stability of the load current. Specifically, the first driving module adjusts the initial level signal based on the sampling voltage of the current sampling module, and the second driving module adjusts the maintenance level signal based on the sampling voltage of the current sampling module. Furthermore, the load current is regulated by turning the first switching module on or off. This invention is unaffected by external temperature and voltage, and can regulate the load current in different environments, exhibiting high reliability and good regulation effect, thus improving the service life of the load.

[0031] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a driving circuit according to an embodiment of the present utility model;

[0034] Figure 2 This is a schematic diagram of another driving circuit provided according to an embodiment of the present utility model;

[0035] Figure 3 This is a schematic diagram of another driving circuit provided according to an embodiment of the present utility model;

[0036] Figure 4 This is a schematic diagram of another driving circuit provided according to an embodiment of the present utility model;

[0037] Figure 5 This is a schematic diagram of another driving circuit provided according to an embodiment of the present utility model;

[0038] Figure 6 This is a schematic diagram of another driving circuit provided according to an embodiment of the present utility model;

[0039] Figure 7 This is a schematic diagram of another driving circuit provided according to an embodiment of the present utility model. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] This utility model embodiment provides a driving circuit. Figure 1 This is a schematic diagram of a driving circuit provided in an embodiment of the present invention. (Reference) Figure 1 The driving circuit includes: a first switching module 1, a current sampling module 2, a first driving module 3, a second driving module 4, and a control module. The first switching module 1 is connected between the power supply terminal and the load 5. The current sampling module 2 is connected between the load 5 and the ground terminal, and is used to generate a sampling voltage based on the current flowing from the load. The first driving module 3 is connected between the current sampling module 2 and the control terminal of the first switching module 1, and is used to output an initial level signal; the initial level signal is used to control the first switching module 1 to turn on or off. The second driving module 4 is connected between the current sampling module 2 and the control terminal of the first switching module 1, and is used to output a sustaining level signal; the sustaining level signal is used to control the first switching module 1 to turn on or off. The control module is connected to the first driving module 3 and the second driving module 4, and is used to turn on either the first driving module 3 or the second driving module 4.

[0043] The load 5 is connected to the power supply terminal via the first switch module 1. The switching on or off of the first switch module 1 can be used to regulate the current flowing into the load 5 from the power supply terminal. For example, the load 5 can be a contactor coil. By adjusting the current value input to the contactor coil, the electromagnetic attraction force of the contactor coil can be adjusted, thereby driving the contactor to engage or disengage.

[0044] When load 5 is in the initial power-on phase, load 5 changes from a power-off state to a power-on state. The control module controls the first drive module 3 to turn on and controls the second drive module 4 to turn off. The first drive module 3 receives the sampled voltage from the current sampling module 2 and generates an initial level signal based on the sampled voltage.

[0045] For example, the initial level signal can be a square wave signal. When the sampling voltage is high, it indicates that the current in the load 5 is high, and the first drive module 3 controls the first switch module 1 to turn off, thereby reducing the current in the input load 5. When the sampling voltage is low, it indicates that the current in the load 5 is low, and the first drive module 3 controls the first switch module 1 to turn on, thereby increasing the current in the input load 5. Therefore, the first drive module 3 can quickly adjust the current of the load 5 through the initial level signal, keeping the current of the load 5 stable.

[0046] After a certain period of time, when load 5 is powered on, it is in a energized state. The control module controls the second drive module 4 to turn on and controls the first drive module 3 to turn off. The second drive module 4 receives the sampled voltage from the current sampling module 2 and generates a sustaining level signal based on the sampled voltage.

[0047] For example, the sustaining signal can be a PWM signal. The second drive module 4 adjusts the duty cycle of the sustaining signal according to the sampled voltage to control the on or off time of the first drive module 3, thereby regulating the current of the load 5. For example, when the sampled voltage is low, the second drive module 4 increases the duty cycle of the sustaining signal to increase the on-time of the first switch module 1, thereby increasing the current in the input load 5. When the sampled voltage is high, the second drive module 4 decreases the duty cycle of the sustaining signal to decrease the on-time of the first switch module 1, thereby decreasing the current in the input load 5. The second drive module 4 can maintain the stability of the current in the load 5 by maintaining the sustaining signal.

[0048] The technical solution provided by this embodiment of the invention, by setting a first driving module, can quickly adjust the load current during the power-on phase of the load, keeping the load current stable. After the load is powered on, a second driving module maintains the stability of the load current. Specifically, the first driving module adjusts the initial level signal based on the sampling voltage of the current sampling module, and the second driving module adjusts the maintenance level signal based on the sampling voltage of the current sampling module. Furthermore, the load current is adjusted by turning the first switching module on or off. This invention is unaffected by external temperature and voltage, and can adjust the load current in different environments, exhibiting high reliability and good driving effect, thus improving the service life of the load.

[0049] Figure 2 A schematic diagram of another driving circuit provided in an embodiment of this utility model. (Reference) Figure 2Based on the above embodiments, optionally, the first driving module 3 includes: a comparator 31 and a first switching switch 32. The first input terminal of the comparator 31 is connected to the reference signal Vref. The second input terminal of the comparator 31 is connected to the output terminal of the current sampling module 2. The output terminal of the comparator 31 is connected to the first terminal of the first switching switch 32. The second terminal of the first switching switch 32 is connected to the control terminal of the first switching module 1. The control terminal of the first switching switch 1 is connected to the control module.

[0050] The comparator 31 can generate different initial level signals based on the reference signal Vref and the sampled voltage. For example, the first switching module can be a transistor. When the reference signal Vref is greater than the sampled voltage, the comparator 31 outputs a high-level signal, thereby controlling the first switching module 1 to turn on. When the reference signal Vref is less than the sampled voltage, the comparator 31 outputs a low-level signal, thereby controlling the first switching module 1 to turn off. Different high and low level signals can thus form different initial level signals.

[0051] The first driving module provided in this embodiment of the invention can output an initial level signal based on the magnitude relationship between the sampled voltage and the reference signal through a comparator. The comparator can quickly respond to and process the sampled voltage and the reference signal, and has a high processing speed to achieve rapid output of the initial level signal. This makes the first driving module have high efficiency and control speed, and can quickly achieve current balancing of the load during the initial power-on phase.

[0052] Figure 3 This is a schematic diagram of another driving circuit provided in an embodiment of the present utility model. (Reference) Figure 3 Based on the above embodiments, optionally, the second driving module 4 includes: a logic unit 41 and a second switching switch 42. The first end of the logic unit 41 is connected to the output end of the current sampling module 2, the second end of the logic unit 41 is connected to the first end of the second switching switch 42, and the second end of the second switching switch 42 is connected to the control end of the first switching module 1.

[0053] The logic unit 41 receives the sampled voltage output by the current sampling module 2 and adjusts the sustain level signal according to the sampled voltage. After the load 5 is powered on, the control module controls the first switch 32 to turn off and the second switch 42 to turn on. The logic unit 41 inputs the sustain level signal to the first switch module 1 through the second switch 42. The logic unit 41 can adaptively adjust the sustain level signal according to the magnitude of the sampled voltage and control the current balance of the load 5 through the first switch module 1, thereby ensuring that the load 5 operates in a constant current state.

[0054] Comparator 31 has a faster adjustment speed than logic unit 41. The initial power-on period of load 5 is short, allowing comparator 31 to enable load 5 to reach a stable current more quickly. Once load 5 is powered on and in normal operating condition, rapid current adjustment via comparator 31 is unnecessary; logic unit 41 is sufficient to regulate the current of load 5. Logic unit 41, composed of logic gates, can adjust the holding level signal in real time based on the sampled voltage. Furthermore, the logic gates have low power consumption, and the output signal can directly control the first switching module 1 without amplification, providing better control and thus ensuring the stability of the load 5 current.

[0055] This embodiment of the invention, by setting a logic unit, can automatically adjust the level signal according to the magnitude of the sampled voltage, which has a good adjustment effect and ensures the constant current state of the load current.

[0056] Figure 4 This is a schematic diagram of another driving circuit provided in an embodiment of the present utility model. (Reference) Figure 4 Based on the above embodiments, optionally, the current sampling module 2 includes a sampling resistor 21 and a current sampling unit 22. The first end of the sampling resistor 21 is connected to the second end of the load 5, and the second end of the sampling resistor 21 is grounded. The current sampling unit 22 is connected in parallel between the first end and the second end of the sampling resistor 21. The output end of the current sampling unit 22 serves as the output end of the current sampling module 2, and the current sampling unit 22 is used to generate a sampling voltage.

[0057] Since the sampling resistor 21 is connected in series with the load 5, the sampling resistor 21 and the load 5 have the same current. The current sampling unit 22 can be used to generate a sampling voltage based on the current and resistance value of the sampling resistor 21. The magnitude of the sampling voltage is proportional to the magnitude of the current in the load 5. The first driving module 3 can be used to adjust the initial level signal based on the magnitude of the sampling voltage and the reference signal Vref, and the second driving module 4 can be used to adjust the maintenance level signal based on the magnitude of the sampling voltage.

[0058] Continue to refer to Figure 4 Based on the above embodiments, optionally, the control module includes a delay unit connected to the first drive module 3 and the second drive module 4. The delay unit is used to turn on the first drive module 3 within a first time period and turn on the second drive module 4 after the first time period.

[0059] For example, load 5 can be a contactor coil. When the contactor coil is energized, the contactor engages. The engagement time of the contactor can be 100ms, that is, the first time can be 100ms.

[0060] Within the first instant, the delay unit controls the first switching switch 32 to turn on, the comparator 31 outputs an initial level signal and controls the contactor coil to be energized, causing the contactor to engage. To ensure the strength of the contactor engagement, the comparator 31 adjusts the initial level signal according to the magnitude of the sampled voltage and the reference signal Vref, so that the current flowing through the contactor coil can be adjusted according to the magnitude of the sampled voltage.

[0061] After the first time, the contactor is already in the energized state. The delay unit controls the first switching switch 32 to turn off and the second switching switch 42 to turn on. The logic unit 41 adjusts the on / off state of the first switching module 1 according to the sampling voltage output maintenance level signal to keep the current of the contactor coil constant.

[0062] Figure 5 This is a schematic diagram of another driving circuit provided in an embodiment of the present utility model. (Reference) Figure 5 Based on the above embodiments, optionally, the driving circuit further includes: a second switch module 6 and a first diode D1. The first terminal of the second switch module 6 is connected to the second terminal of the load 5, the second terminal of the second switch module 6 is connected to the first terminal of the sampling resistor 21, and the control terminal of the second switch module 6 is connected to the second driving module 4; the second driving module 4 is used to output a holding level signal and control the second switch module 6 to be turned on or off. The first terminal of the first diode D1 is connected to the first terminal of the load 5, and the second terminal of the first diode D1 is connected to the second terminal of the sampling resistor 21; the first diode D1 is used to freewheel the current flowing out of the load 5; the off-time of the second switch module 6 is positively correlated with the freewheeling time.

[0063] Specifically, when the first switch module 1 receives an initial level signal or a sustain level signal, the logic unit 41 outputs a sustain level signal to the second switch module 6, keeping the second switch module 6 in an on state, thereby energizing the load 5. Therefore, when the load 5 is powered on, the second switch module 6 always remains in an on state.

[0064] When the first switch module 1 is turned off and the load 5 is an inductive load, after the load 5 loses power, the current in the load 5 cannot change abruptly, causing the load 5 to continue outputting current. By forming a freewheeling circuit with the first diode D1, the current in the load 5 can be freewheeled through the first diode D1 after the first switch module 1 is turned off. Therefore, when the drive circuit loses power, the second switch module 6 can be turned off after the first switch module 1. Exemplarily, both the first switch module 1 and the second switch module 6 may include transistors.

[0065] The turn-off time of the second switch module 6 can be adaptively adjusted according to the withstand voltage capability of each module in the drive circuit. For example, when the withstand voltage capability of the first switch module 1, the second switch module 6, or other modules is strong, the second switch module 6 can be set to a shorter turn-off time. In this case, the freewheeling time of the first diode D1 is shorter, allowing the drive circuit to quickly turn off the power supply to the load 5. The load 5 quickly loses power, and the back electromotive force generated by the load 5 will not damage the drive circuit. This setting ensures both rapid power loss of the load 5 and prevents damage to the drive circuit from the back electromotive force.

[0066] When the withstand voltage of the first switch module 1, the second switch module 6, or other modules is weak, the second switch module 6 can be set to have a longer turn-off time. In this case, the freewheeling time of the first diode D1 is longer, and the load 5 can be de-energized after sufficient current release. This setting ensures the full release of the back electromotive force, thereby guaranteeing the safe operation of the drive circuit.

[0067] Figure 6 This is a schematic diagram of another driving circuit provided in an embodiment of the present utility model. (Reference) Figure 6 Optionally, based on the above embodiments, the driving circuit further includes a driving control module 7. The first input terminal of the driving control module 7 is connected to the output terminal of the first driving module 3 and the first output terminal of the second driving module 4, and the first output terminal of the driving control module 7 is connected to the control terminal of the first switch module 1. The driving control module 7 is used to drive the first switch module 1 to turn on or off according to an initial level signal or a maintenance level signal. The second input terminal of the driving control module 7 is connected to the second output terminal of the second driving module 4, and the second output terminal of the driving control module 7 is connected to the control terminal of the second switch module 6. The driving control module 7 is also used to drive the second switch module 6 to turn on or off according to a maintenance level signal.

[0068] To ensure the driving capability of the output signals of the first driving module 3 and the second driving module 4, the driving control module 7 amplifies the initial level signal or the sustaining level signal before inputting it into the first switching module 1, thereby improving the driving capability of the initial level signal and the sustaining level signal for the first switching module 1. The driving control module 7 can also amplify the holding level signal before inputting it into the second switching module 6, thereby improving the driving capability of the holding level signal for the second switching module 6.

[0069] Figure 7 This is a schematic diagram of another driving circuit provided in an embodiment of the present utility model. (In conjunction with...) Figure 6 and Figure 7Based on the above embodiments, optionally, the drive control module 7 includes: a first signal drive unit 71, a second signal drive unit 72, and a transmission chip 73. The transmission chip 73 includes: a first input interface 731, a second input interface 732, a first output interface 733, an amplification interface 734, and a second output interface 735. The amplification interface 734 is connected to a second power supply terminal; the first input interface 731 is connected to the output terminal of the first drive module 3 and the first output terminal of the second drive module 4; the first output interface 731 is connected to the first terminal of the first signal drive unit 71; and the second terminal of the first signal drive unit 71 is connected to the control terminal of the first switch module 1. The second input interface 732 is connected to the second output terminal of the second drive module 4; the second output interface 735 is connected to the first terminal of the second signal drive unit 72; and the second terminal of the second signal drive unit 72 is connected to the control terminal of the second switch module 6.

[0070] The first input interface 731 includes a pin Hin, which can be used to receive an initial level signal or a sustain level signal. The first output interface 733 includes a pin Ho. The amplification interface 734 includes pins VB, VS, VCC, and COM. The second input interface 732 includes a pin Lin, which can be used to receive a sustain level signal. The second output interface 735 includes a pin Lo. The first signal driving unit 71 includes a first resistor R1. The second signal driving unit 72 includes a third resistor R3.

[0071] The second power supply terminal is connected to pin VB via the second resistor R2 and the second diode D2. The first terminal of the first capacitor C1 is connected to the first terminal of load 5 and pin VS, and the second terminal of the first capacitor C1 is connected to pin VB. The second power supply terminal is also connected to pin VCC, and pin COM is connected to the second power supply terminal via the second capacitor C2 and the third capacitor C3 connected in parallel. For example, the second power supply terminal can be used to provide a 12V voltage.

[0072] The first capacitor C1 stores the input voltage of the second power supply terminal and provides voltage to pin VB. This voltage can be used to amplify the initial level signal, the sustain level signal, or the hold level signal, thereby improving the signal's driving capability. The second capacitor C2 and the third capacitor C3 are used to filter the input voltage of the second power supply terminal.

[0073] For example, a first Zener diode (TVS1) can be connected in parallel across the first switching module 1, and a second Zener diode (TVS2) can be connected in parallel across the second switching module 6 and the sampling resistor 21, after being connected in series. The first Zener diode (TVS1) and the second Zener diode (TVS2) can be transient voltage suppressors, mainly used to protect the first switching module 1 and the second switching module 6 from transient high-voltage spikes. When the first Zener diode (TVS1) and the second Zener diode (TVS2) are subjected to a reverse transient high-energy impact, the first Zener diode (TVS1) and the second Zener diode (TVS2) can quickly change the high impedance between their terminals to a low impedance, clamping the voltage between their terminals to a predetermined value, thereby effectively protecting the drive circuit.

[0074] Continue to refer to Figure 6 Optionally, based on the above embodiments, the load includes a contactor coil.

[0075] The contactor coil can be a DC contactor coil. When the ambient temperature changes, the resistance of the contactor coil will also change. If the current flowing through the contactor coil remains constant, it may cause the contactor to fail to engage or maintain unreliable operation or even trip. It may also cause excessive power consumption and severe bouncing during the engagement process due to excessive attraction force, thereby shortening the life of the contactor.

[0076] This embodiment of the invention, by setting a first driving module and a second driving module, allows for current adjustment via the first driving module when the contactor coil is first energized; after the contactor is engaged, the current is adjusted via the second driving module. Furthermore, the first and second driving modules can adaptively adjust the initial level signal and the maintenance level signal based on the sampled voltage to ensure a constant current in the contactor coil, thereby maintaining a constant contactor attraction force.

[0077] This utility model embodiment also provides a driving device. The driving device includes the driving circuit provided in any embodiment of this utility model, and has similar beneficial effects to the driving circuit, which will not be described in detail here.

[0078] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0079] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A driving circuit, characterized in that, include: The first switch module is connected between the power supply and the load; A current sampling module is connected between the load and the ground terminal, and the current sampling module is used to generate a sampling voltage based on the current flowing out of the load; The first driving module is connected between the control terminals of the current sampling module and the first switching module, and is used to output an initial level signal; the initial level signal is used to control the first switching module to be turned on or off. The second drive module is connected between the current sampling module and the control terminal of the first switch module, and is used to output a sustaining level signal; the sustaining level signal is used to control the first switch module to be turned on or off. A control module is connected to the first drive module and the second drive module, and the control module is used to turn on the first drive module or the second drive module.

2. The driving circuit according to claim 1, characterized in that, The first driving module includes: A comparator and a first switching switch are provided. The first input terminal of the comparator is connected to a reference signal. The second input terminal of the comparator is connected to the output terminal of the current sampling module. The output terminal of the comparator is connected to the first terminal of the first switching switch. The second terminal of the first switching switch is connected to the control terminal of the first switching module. The control terminal of the first switching switch is connected to the control module.

3. The driving circuit according to claim 1, characterized in that, The second drive module includes: The logic unit and the second switch are provided. The first end of the logic unit is connected to the output end of the current sampling module, the second end of the logic unit is connected to the first end of the second switch, and the second end of the second switch is connected to the control end of the first switch module.

4. The driving circuit according to claim 1, characterized in that, The current sampling module includes: a sampling resistor and a current sampling unit; The first end of the sampling resistor is connected to the second end of the load, the second end of the sampling resistor is grounded, the current sampling unit is connected in parallel between the first and second ends of the sampling resistor, the output end of the current sampling unit serves as the output end of the current sampling module, and the current sampling unit is used to generate the sampling voltage.

5. The driving circuit according to claim 1, characterized in that, The control module includes a delay unit connected to the first drive module and the second drive module; The delay unit is used to turn on the first driving module within a first time period and turn on the second driving module after the first time period.

6. The driving circuit according to claim 4, characterized in that, The driving circuit also includes: The second switching module has a first terminal connected to the second terminal of the load, a second terminal connected to the first terminal of the sampling resistor, and a control terminal connected to the second driving module. The second driving module is used to output a hold-level signal and control the second switching module to be turned on or off. The first diode has its first end connected to the first end of the load and its second end connected to the second end of the sampling resistor. The first diode is used to freewheel the current flowing out of the load. The off-time of the second switching module is positively correlated with the freewheeling time.

7. The driving circuit according to claim 6, characterized in that, The driving circuit also includes: A drive control module is provided, wherein a first input terminal of the drive control module is connected to the output terminal of the first drive module and the first output terminal of the second drive module, and a first output terminal of the drive control module is connected to the control terminal of the first switch module; the drive control module is used to drive the first switch module to turn on or off according to the initial level signal or the sustaining level signal. The second input terminal of the drive control module is connected to the second output terminal of the second drive module, and the second output terminal of the drive control module is connected to the control terminal of the second switch module; the drive control module is also used to drive the second switch module to turn on or off according to the holding level signal.

8. The driving circuit according to claim 7, characterized in that, The drive control module includes: a first signal drive unit, a second signal drive unit, and a transmission chip; The transmission chip includes: a first input interface, a second input interface, a first output interface, an amplification interface, and a second output interface; The amplification interface is connected to the second power supply terminal; the first input interface is connected to the output terminal of the first drive module and the first output terminal of the second drive module; the first output interface is connected to the first terminal of the first signal drive unit; and the second terminal of the first signal drive unit is connected to the control terminal of the first switch module. The second input interface is connected to the second output terminal of the second drive module, the second output interface is connected to the first terminal of the second signal drive unit, and the second terminal of the second signal drive unit is connected to the control terminal of the second switch module.

9. The driving circuit according to claim 1, characterized in that, The load includes a contactor coil.

10. A driving device, characterized in that, include: The driving circuit according to any one of claims 1-9.

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