Driving circuit for generating negative voltage and power supply system
By designing a driving circuit including a negative voltage generation module, a shutdown module and a transformer T1, the problem of traditional driving circuit lacking negative voltage shutdown function is solved, and higher reliability and safety are achieved, and costs are reduced.
Patent Information
- Application Number
- CN202421781489.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-25
AI Technical Summary
The driving circuits of traditional power switching devices lack negative voltage shutdown function, which leads to misdirection and increases the risk and cost of switching power supply.
A driving circuit including a negative voltage generation module, a shutdown module and a transformer T1 is designed, and the pulse signal is received through the transformer T1, and the negative voltage is charged at a high level, and the controlled device is output quickly shut down.
It effectively reduces the risk of misdirection, improves the reliability and safety of the circuit, and reduces costs by simplifying the circuit structure.
Smart Images
Figure CN222953916U_ABST
Abstract
Description
[Technical field]
[0001] The utility model relates to the technical field of power supplies, and in particular to a drive circuit and a power supply system for generating negative pressure. [Background technology]
[0002] In the field of modern electronic technology, switching power supplies have been widely used due to their high efficiency and stability. As the core component of switching power supplies, the performance and reliability of power devices directly affect the overall quality of switching power supplies. With the rapid advancement of switching power supply technology, the application of power switching devices in power supplies is increasing. However, in the driving link of power devices, they face a series of challenges.
[0003] On the one hand, the traditional power switch device drive circuit has obvious defects, that is, it does not have a negative voltage shutdown function. This leads to the phenomenon of mis-turning on the power device during shutdown due to the parasitic capacitance of the power device, temperature changes, etc., which can damage the entire switching power supply in severe cases, bringing huge risks and losses to practical applications.
[0004] On the other hand, although some traditional drive circuits have negative voltage shutdown functions, their implementation often requires the construction of an additional negative voltage power supply. This design not only greatly increases the complexity of power supply design, but also significantly increases the cost of the power supply, which is not conducive to the widespread promotion and application of switching power supplies in the market. [Contents of the utility model]
[0005] The embodiments of the utility model provide a drive circuit and a power supply system for generating negative pressure, aiming to solve the technical problem of high cost of power switches when being turned off under negative pressure in the prior art.
[0006] In order to solve the above technical problems, a technical solution adopted by the embodiment of the utility model is: providing a driving circuit for generating negative pressure, the driving circuit for generating negative pressure includes a negative pressure generating module, a shut-off module and a transformer T1;
[0007] The transformer T1 is connected to the controlled device and the shutdown module respectively, the shutdown module is connected to the controlled device and the negative pressure generating module respectively, the negative pressure generating module is also connected to the controlled device, and the transformer T1 is used to receive the pulse signal;
[0008] The transformer T1 is used to control the controlled device to be turned on when the pulse signal is at a high level, so as to charge the negative pressure generating module through the controlled device, thereby enabling the negative pressure generating module to generate negative pressure; and
[0009] When the pulse signal is at a low level, the shutdown module is controlled to be turned on, so as to output the negative pressure in the negative pressure generating module to the controlled device, so that the controlled device is quickly shut down.
[0010] Optionally, the negative pressure generating module includes an energy storage unit and a maintaining unit;
[0011] The maintaining unit is connected to the fifth pin of the transformer T1 and the shutdown module respectively, and the maintaining unit is also connected to the energy storage unit, and the energy storage unit is connected to the sixth pin of the transformer T1 and the controlled device respectively;
[0012] The energy storage unit is used to charge based on the high level output by the transformer T1 when the controlled device is turned on, so as to generate a negative voltage; and
[0013] When the shutdown module is turned on, a negative pressure is output to the controlled device through the shutdown module to shut down the controlled device;
[0014] The maintaining unit is used for charging the energy storage unit based on the negative pressure output by the shutdown module when the controlled device is turned off, so as to maintain the energy storage unit to continuously output the negative pressure.
[0015] Optionally, the energy storage unit is a capacitor C1;
[0016] The first end of the capacitor C1 is connected to the sixth pin of the transformer T1 , and the second end of the capacitor C1 is connected to the maintaining unit and the controlled device respectively.
[0017] Optionally, the maintaining unit is a resistor R4;
[0018] The resistor R4 is connected to the fifth pin of the transformer T1 and the second end of the capacitor C1 respectively.
[0019] Optionally, the shutdown module includes a magnetic bead L1, a resistor R3 and a switch tube Q1;
[0020] The control end of the switch tube Q1 is connected to the sixth pin of the transformer T1 through the magnetic bead L1, the first end of the switch tube Q1 is connected to the controlled device through the resistor R3, and the second end of the switch tube Q1 is connected to the negative voltage generating module.
[0021] Optionally, the driving circuit for generating negative pressure further includes a driving module;
[0022] The driving module is connected to the fifth pin of the transformer T1, and the driving module is also connected to the controlled device;
[0023] The driving module is used to receive the pulse signal output by the transformer T1 and drive the controlled device to turn on based on the pulse signal.
[0024] Optionally, the driving module includes a resistor R1 and a resistor R2;
[0025] The resistor R1 is connected to the fifth pin of the transformer T1 and the resistor R2 respectively, and the resistor R2 is connected to the shutdown module and the controlled device respectively.
[0026] Optionally, the driving circuit for generating negative pressure further includes a clamping module;
[0027] The clamping module is connected in parallel with the negative pressure generating module;
[0028] The clamping module is used to limit the negative pressure generated by the negative pressure generating module.
[0029] Optionally, the driving circuit for generating negative pressure further includes an anti-backflow module;
[0030] The backflow prevention module is connected to the sixth foot of the transformer T1 and the negative pressure generating module respectively;
[0031] The backflow prevention module is used to prevent the current of the sixth foot of the transformer T1 from flowing to the negative voltage generating module.
[0032] In order to solve the above technical problems, another technical solution adopted by the embodiment of the utility model is: to provide a power supply system, the power supply system comprising:
[0033] Controlled device;
[0034] Controller; and
[0035] A driving circuit for generating negative pressure as described above.
[0036] Different from the related art, the utility model provides a driving circuit and power supply system for generating negative pressure, wherein the driving circuit for generating negative pressure includes a negative pressure generating module, a shut-off module and a transformer T1; the transformer T1 is connected to the controlled device and the shut-off module respectively, the shut-off module is connected to the controlled device and the negative pressure generating module respectively, the negative pressure generating module is also connected to the controlled device, and the transformer T1 is used to receive a pulse signal. The transformer T1 is used to control the controlled device to conduct when the pulse signal is at a high level, so as to charge the negative pressure generating module through the controlled device, so that the negative pressure generating module generates negative pressure; and when the pulse signal is at a low level, control the shut-off module to conduct, so as to output the negative pressure in the negative pressure generating module to the controlled device, so that the controlled device is quickly shut down, thereby reducing the risk of mis-conduction and improving the reliability and safety of the circuit. Moreover, the negative pressure can be generated by the cooperation between the transformer T1 and the negative pressure generating module, and no additional complex circuit is required to realize the negative pressure shut-off function, thereby reducing the cost of the circuit.
Brief Description of the Drawings
[0037] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.
[0038] Figure 1 It is a structural block diagram of a power supply system provided by an embodiment of the utility model;
[0039] Figure 2 It is a structural block diagram of a driving circuit for generating negative pressure provided by an embodiment of the utility model;
[0040] Figure 3 It is a circuit diagram of a driving circuit for generating negative pressure provided by an embodiment of the utility model. [Specific implementation method]
[0041] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0042] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.
[0043] When an element is referred to as being “connected to” another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween.
[0044] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more.
[0045] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.
[0046] See also Figure 1 , Figure 1 is a structural block diagram of a power supply system provided by an embodiment of the utility model, such as Figure 1 As shown, the power supply system 100 includes a driving circuit 10 for generating negative voltage, a controller 20 and a controlled device 30; the driving circuit 10 for generating negative voltage is connected to the controller 20 and the controlled device 30 respectively, and the driving circuit 10 for generating negative voltage is used to receive the pulse signal output by the controller 20, and control the controlled device 30 to be turned on when the pulse signal is at a high level. At the same time, based on the negative voltage stored in the turned-on controlled device 30, when the pulse signal is at a low level, the negative voltage is output to the controlled device 30, so that the controlled device 30 is turned off. It should be noted that due to the presence of parasitic capacitance in the controlled device 30, the controlled device 30 cannot be turned off immediately after the controller 20 stops outputting the pulse signal, resulting in a mis-conduction situation. Therefore, through the negative pressure generating driving circuit 10, negative pressure is generated when the controlled device 30 is turned on, so that when the controlled device 30 needs to be turned off, negative pressure is output to the controlled device 30, so that the controlled device 30 is quickly turned off, thereby avoiding mis-conduction.
[0047] In some embodiments, the power supply system 100 further includes a load 40 (not shown), and the controlled device 30 is also connected to the load 40. The load 40 is used to start working based on the voltage output by the controlled device 30 when the controlled device 30 is turned on; and stop working when the controlled device 30 is turned off. It should be noted that when the load 40 is disconnected from the controlled device 30, the controlled device 30 needs to be in the off state. At this time, if the controlled device 30 is mis-turned on, the controlled device 30 is in a no-load state, resulting in a waste of resources. Therefore, when the controlled device 30 needs to be in the off state, a negative voltage is output to the controlled device 30, thereby avoiding the situation where the controlled device 30 is mis-turned on, thereby saving resources.
[0048] For further information, see Figure 2 , Figure 2 : is a structural block diagram of a driving circuit for generating negative pressure provided by an embodiment of the utility model, such as Figure 2 As shown, the negative voltage generating driving circuit 10 includes a transformer T1, a negative voltage generating module 11 and a shut-down module 12;
[0049] The transformer T1 is connected to the controlled device 30 and the shutdown module 12 respectively, the shutdown module 12 is connected to the controlled device 30 and the negative pressure generating module 11 respectively, the negative pressure generating module 11 is also connected to the controlled device 30, and the transformer T1 is used to receive the pulse signal;
[0050] The transformer T1 is used to control the controlled device 30 to be turned on when the pulse signal is at a high level, so as to charge the negative pressure generating module 11 through the controlled device 30, so that the negative pressure generating module 11 generates negative pressure; and
[0051] When the pulse signal is at a low level, the shutdown module 12 is controlled to be turned on, so as to output the negative pressure in the negative pressure generating module 11 to the controlled device 30 , so that the controlled device 30 is quickly shut down.
[0052] Specifically, the transformer T1 includes a primary side and a secondary side. The primary side of the transformer T1 is connected to the controller 20 and is mainly used to receive the pulse signal output by the controller 20. After the transformer T1 receives the pulse signal output by the controller 20, since the primary side and the secondary side of the transformer T1 are coupled to each other, the secondary side of the transformer T1 will also receive the corresponding pulse signal. When the pulse signal received by the secondary side of the transformer T1 is a high level, the high level will be output to the control end of the controlled device 30, so that the controlled device 30 is turned on, and then the high level output by the transformer T1 is input into the negative voltage generating module 11 through the controlled device 30, so that the negative voltage is generated in the negative voltage generating module 11. When the secondary side of the transformer T1 receives a low level, the shutdown module 12 will be in a conducting state. At this time, the negative pressure in the negative voltage generating module 11 will be fed back to the control end of the controlled device 30 through the shutdown module 12, so that the controlled device 30 is quickly turned off.
[0053] In some embodiments, Figure 2 As shown, the negative pressure generating module 11 includes an energy storage unit 111 and a maintaining unit 112;
[0054] The maintaining unit 112 is connected to the fifth pin of the transformer T1 and the shut-down module 12 respectively, and the maintaining unit 112 is also connected to the energy storage unit 111, and the energy storage unit 111 is connected to the sixth pin of the transformer T1 and the controlled device 30 respectively;
[0055] The energy storage unit 111 is used to charge based on the high level output by the transformer T1 to generate a negative voltage when the controlled device 30 is turned on; and
[0056] When the shut-off module 12 is turned on, a negative pressure is output to the controlled device 30 through the shut-off module 12, so that the controlled device 30 is shut down;
[0057] The maintaining unit 112 is used for charging the energy storage unit 111 based on the negative pressure output by the shut-down module 12 when the controlled device 30 is shut down, so as to maintain the energy storage unit 111 to continuously output the negative pressure.
[0058] Specifically, the primary side of the transformer T1 includes the fourth pin and the second pin, the secondary side of the transformer T1 includes the fifth pin and the sixth pin, and the second pin of the transformer T1 corresponds to the fifth pin of the transformer T1. That is, when the controller 20 outputs a pulse signal, if the fourth pin of the transformer T1 is at a high level relative to the second pin, the fifth pin of the transformer T1 is at a high level relative to the sixth pin; otherwise, the sixth pin of the transformer T1 is at a high level relative to the fifth pin.
[0059] When the fifth pin of the transformer T1 is at a high level relative to the sixth pin, the high level will be directly output to the control end of the controlled device 30 to turn on the controlled device 30, thereby charging the energy storage unit 111. At the same time, the maintenance unit 112 will also receive the high level output by the transformer T1 and charge the energy storage unit 111 based on the high level.
[0060] When the sixth pin of the transformer T1 is at a high level relative to the fifth pin, the shutdown module 12 is in a conducting state. At this time, the energy storage unit 111 outputs a negative voltage to the control end of the controlled device 30 through the shutdown module 12, so that the controlled device 30 is quickly shut down. At the same time, the negative voltage output by the shutdown module 12 is also fed back to the energy storage unit 111 through the maintenance unit 112, so as to charge the energy storage unit 111, so that the energy storage unit 111 continuously outputs a negative voltage. In some embodiments, the second pin of the transformer T1 may also correspond to the sixth pin of the transformer T1.
[0061] In yet another embodiment, see Figure 3 , Figure 3 is a circuit diagram of a driving circuit for generating negative pressure provided by an embodiment of the utility model, such as Figure 3 As shown, the energy storage unit 111 is a capacitor C1; the maintaining unit 112 is a resistor R4;
[0062] The first end of the capacitor C1 is connected to the sixth pin of the transformer T1 , and the second end of the capacitor C1 is connected to the maintaining unit 112 and the controlled device 30 , respectively.
[0063] The resistor R4 is connected to the fifth pin of the transformer T1 and the second end of the capacitor C1 respectively.
[0064] Specifically, when the controlled device 30 (switch tube Q2) is turned on, the high level output by the fifth pin of the transformer T1 will be output to the second end (C1-2) of the capacitor C1 through the second end of the switch tube Q2 to charge the capacitor C1. It should be noted that in the circuit, the positive and negative of the voltage is determined based on the direction of the current flow. When the current flows into a certain device, the end of the current flowing into the device is positive, and the end of the current flowing out of the device is negative. Therefore, when the capacitor C1 is charged by the controlled device 30, the second end of the capacitor C1 is positive, and the first end (C1-1) of the capacitor C1 is negative. Based on this, when the sixth pin of the transformer T1 outputs a high level, the shutdown module 12 is turned on, so that the first end of the capacitor C1 outputs a voltage to the controlled device 30 through the shutdown module 12. At this time, the voltage output by the capacitor C1 is a negative voltage, thereby controlling the controlled device 30 to be quickly shut down.
[0065] Among them, when the fifth pin of the transformer T1 outputs a high level, the high level is also output to the second end of the capacitor C1 through the resistor R4, thereby accelerating the charging of the capacitor C1. When the sixth pin of the transformer T1 outputs a high level, the negative voltage of the capacitor C1 is output to the controlled device 30 through the shutdown module 12, and the negative voltage also flows through the resistor R4 and is fed back to the second end of the capacitor C1, thereby charging the capacitor C1. Based on this, the capacitor C1 can continuously output a negative voltage to the controlled device 30.
[0066] In yet another embodiment, Figure 2 As shown, the negative pressure generating driving circuit 10 further includes a driving module 13; the driving module 13 is connected to the fifth pin of the transformer T1, and the driving module 13 is also connected to the controlled device 30;
[0067] The driving module 13 is used to receive the pulse signal output by the transformer T1 and drive the controlled device 30 to turn on based on the pulse signal.
[0068] Specifically, when the fifth pin of the transformer T1 outputs a high level, the driving module 13 receives the high level and controls the controlled device 30 to be turned on based on the high level.
[0069] Among them, Figure 3 As shown, the driving module 13 includes a resistor R1 and a resistor R2;
[0070] The resistor R1 is connected to the fifth pin of the transformer T1 and the resistor R2 respectively, and the resistor R2 is connected to the shutdown module 12 and the controlled device 30 respectively. It should be noted that the resistor R1 and the resistor R2 are used to protect the controlled device 30 to avoid damaging the controlled device 30 when the level signal output by the transformer T1 is too high.
[0071] In yet another embodiment, Figure 3 As shown, the shutdown module 12 includes a magnetic bead L1, a resistor R3 and a switch tube Q1;
[0072] The control end of the switch tube Q1 is connected to the sixth pin of the transformer T1 through the magnetic bead L1 , the first end of the switch tube Q1 is connected to the controlled device 30 through the resistor R3 , and the second end of the switch tube Q1 is connected to the negative voltage generating module 11 .
[0073] Specifically, when the sixth pin of the transformer T1 outputs a high level, the switch tube Q1 is turned on based on the high level. At this time, the first end of the capacitor C1 outputs a negative voltage to the control end of the controlled device 30 through the switch tube Q1, the resistor R3, and the resistor R2, so that the controlled device 30 is quickly turned off.
[0074] In some embodiments, Figure 2 As shown, the negative pressure generating driving circuit 10 further includes a clamping module 14; the clamping module 14 is connected in parallel with the negative pressure generating module 11;
[0075] The clamping module 14 is used to limit the negative pressure generated by the negative pressure generating module 11 .
[0076] Specifically, Figure 3 As shown, the clamping module 14 is a voltage regulator tube D2 , an anode of the voltage regulator tube D2 is connected to the first end of the capacitor C1 , and a cathode of the voltage regulator tube D2 is connected to the controlled device 30 .
[0077] When the controlled device 30 is turned on, the high level of the transformer T1 is input to the cathode of the voltage regulator D2 while charging the capacitor C1. When the high level output by the transformer T1 exceeds the voltage regulation value of the voltage regulator D2, the voltage regulator D2 is broken down, causing the high level to be directly input to the sixth pin of the transformer T1 through the voltage regulator D2, so that the capacitor C1 is short-circuited and charging stops. It should be noted that by changing the voltage regulation value of the voltage regulator D2, different negative pressures can be generated, thereby meeting the shutdown requirements of different power devices and improving the application range of the circuit.
[0078] In another embodiment, if Figure 2 As shown, the negative pressure generating driving circuit 10 further includes an anti-backflow module 15; the anti-backflow module 15 is respectively connected to the sixth pin of the transformer T1 and the negative pressure generating module 11;
[0079] The backflow prevention module 15 is used to prevent the current of the sixth foot of the transformer T1 from flowing to the negative voltage generating module 11 .
[0080] Specifically, Figure 3 As shown, the backflow prevention module 15 is a diode D1, the anode of the diode D1 is connected to the first end of the capacitor C1, and the cathode of the diode D1 is connected to the sixth pin of the transformer T1.
[0081] Wherein, based on the unidirectional conductivity of the diode, when the sixth pin of the transformer T1 is at a high level, the high level cannot flow into the first end of the capacitor C1.
[0082] It should be noted that when the controlled device 30 is turned on, the capacitor C1 starts to charge. If the voltage stored in the capacitor C1 exceeds the voltage stabilization value of the voltage regulator D2, the voltage regulator D2 is broken down. At this time, the capacitor C1 is short-circuited, and the controlled device 30, the voltage regulator D2, the diode D1 and the sixth foot of the transformer T1 form a loop, so that the controlled device 30 is still in the on state. Based on this, when the transformer T1 outputs a high level, the controlled device 30 is maintained to be turned on through the voltage regulator D2 and the diode D1; when the transformer T1 outputs a low level, the controlled device 30 is maintained to be turned off through the resistor R4 and the capacitor C1, thereby avoiding the mis-turning on or off of the controlled device 30, thereby improving the stability of the circuit.
[0083] In some embodiments, Figure 3 As shown, when the primary side of the transformer T1 receives the pulse signal, if the fifth pin of the transformer T1 is at a high level relative to the sixth pin, the fifth pin of the transformer T1, the resistor R1, the resistor R2, the switch tube Q2 (controlled device 30), the capacitor C1 and the diode D1, and the sixth pin of the transformer T1 form a loop, and when the voltage stored in the parasitic capacitor of the switch tube Q2 is greater than the conduction threshold of the switch tube Q2, the switch tube Q2 is turned on. At this time, the high level charges the capacitor C1, and since the positive and negative voltage is determined based on the direction of the current flow, the first end of the capacitor C1 is in a negative voltage state compared to the second end of the capacitor C1.
[0084] When the sixth pin of the transformer T1 is at a high level relative to the fifth pin, the magnetic bead L1, the switch tube Q1, the resistor R3, and the resistor R1 form a loop, so that the switch tube Q1 is turned on. When the switch tube Q1 is turned on, the negative voltage in the capacitor C1 is input to the control end of the switch tube Q2 through the switch tube Q1, the resistor R3 and the resistor R2, so as to control the switch tube Q2 to be quickly turned off. It should be noted that when the switch tube Q1 is turned on, the negative voltage output by the capacitor C1 will also be fed back to the second end of the capacitor C1 through the resistor R4, so that the capacitor C1 can continue to output negative voltage. Based on this, the negative voltage shutdown can be achieved through the characteristics of the current in the circuit and the charging and discharging characteristics of the capacitor, thereby reducing the cost of shutting down the power device.
[0085] The utility model provides a driving circuit for generating negative pressure, the driving circuit for generating negative pressure includes a negative pressure generating module, a shutoff module and a transformer T1; the transformer T1 is connected to the controlled device and the shutoff module respectively, the shutoff module is connected to the controlled device and the negative pressure generating module respectively, the negative pressure generating module is also connected to the controlled device, and the transformer T1 is used to receive a pulse signal. The transformer T1 is used to control the controlled device to conduct when the pulse signal is at a high level, so as to charge the negative pressure generating module through the controlled device, so that the negative pressure generating module generates negative pressure; and when the pulse signal is at a low level, control the shutoff module to conduct, so as to output the negative pressure in the negative pressure generating module to the controlled device, so that the controlled device is quickly shut down, thereby reducing the risk of mis-conduction and improving the reliability and safety of the circuit. Moreover, the negative pressure can be generated by the cooperation between the transformer T1 and the negative pressure generating module, and no additional complex circuit is required to realize the negative pressure shutoff function, thereby reducing the cost of the circuit.
[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A driving circuit for generating negative pressure, characterized in that: The driving circuit for generating negative pressure includes a negative pressure generating module, a shut-off module and a transformer T1; The transformer T1 is connected to the controlled device and the shutdown module respectively, the shutdown module is connected to the controlled device and the negative pressure generating module respectively, the negative pressure generating module is also connected to the controlled device, and the transformer T1 is used to receive the pulse signal; The transformer T1 is used to control the controlled device to be turned on when the pulse signal is at a high level, so as to charge the negative pressure generating module through the controlled device, thereby enabling the negative pressure generating module to generate negative pressure; as well as When the pulse signal is at a low level, the shutdown module is controlled to be turned on, so as to output the negative pressure in the negative pressure generating module to the controlled device, so that the controlled device is quickly shut down.
2. The driving circuit for generating negative pressure according to claim 1, characterized in that: The negative pressure generating module comprises an energy storage unit and a maintaining unit; The maintaining unit is connected to the fifth pin of the transformer T1 and the shutdown module respectively, and the maintaining unit is also connected to the energy storage unit, and the energy storage unit is connected to the sixth pin of the transformer T1 and the controlled device respectively; The energy storage unit is used to charge based on the high level output by the transformer T1 when the controlled device is turned on, so as to generate a negative voltage; as well as When the shutdown module is turned on, a negative pressure is output to the controlled device through the shutdown module to shut down the controlled device; The maintaining unit is used for charging the energy storage unit based on the negative pressure output by the shutdown module when the controlled device is turned off, so as to maintain the energy storage unit to continuously output the negative pressure.
3. The driving circuit for generating negative pressure according to claim 2, characterized in that: The energy storage unit is a capacitor C1; The first end of the capacitor C1 is connected to the sixth pin of the transformer T1 , and the second end of the capacitor C1 is connected to the maintaining unit and the controlled device respectively.
4. The driving circuit for generating negative pressure according to claim 3, characterized in that: The maintaining unit is a resistor R4; The resistor R4 is connected to the fifth pin of the transformer T1 and the second end of the capacitor C1 respectively.
5. The driving circuit for generating negative pressure according to claim 1, characterized in that: The shutdown module includes a magnetic bead L1, a resistor R3 and a switch tube Q1; The control end of the switch tube Q1 is connected to the sixth pin of the transformer T1 through the magnetic bead L1, the first end of the switch tube Q1 is connected to the controlled device through the resistor R3, and the second end of the switch tube Q1 is connected to the negative voltage generating module.
6. The driving circuit for generating negative pressure according to claim 1, characterized in that: The driving circuit for generating negative pressure also includes a driving module; The driving module is connected to the fifth pin of the transformer T1, and the driving module is also connected to the controlled device; The driving module is used to receive the pulse signal output by the transformer T1 and drive the controlled device to turn on based on the pulse signal.
7. The driving circuit for generating negative pressure according to claim 6, characterized in that: The driving module includes a resistor R1 and a resistor R2; The resistor R1 is connected to the fifth pin of the transformer T1 and the resistor R2 respectively, and the resistor R2 is connected to the shutdown module and the controlled device respectively.
8. The driving circuit for generating negative pressure according to claim 1, characterized in that: The driving circuit for generating negative pressure also includes a clamping module; The clamping module is connected in parallel with the negative pressure generating module; The clamping module is used to limit the negative pressure generated by the negative pressure generating module.
9. The driving circuit for generating negative pressure according to claim 1, characterized in that: The driving circuit for generating negative pressure also includes an anti-backflow module; The backflow prevention module is connected to the sixth foot of the transformer T1 and the negative pressure generating module respectively; The backflow prevention module is used to prevent the current of the sixth foot of the transformer T1 from flowing to the negative voltage generating module.
10. A power supply system, characterized in that: The power supply system comprises: Controlled device; Controller; and A driving circuit for generating negative pressure as claimed in any one of claims 1 to 9.