Digital control power supply output circuit and digital control power supply output device

Abstract

The invention discloses a digital control power supply output circuit and a digital control power supply output device, and relates to the technical field of power electronics. In the digital control power supply output circuit, an output module is electrically connected between a first power supply and a load, the control end of a control module is electrically connected with a digital signal output end, and the control module is arranged between the control end of the output module and a grounding end; the control end of the short ground self-recovery module is electrically connected with the digital signal output end, and the first end of the short ground self-recovery module is electrically connected with a load; the control end of the first protection module is electrically connected with the second end of the short ground self-recovery module, and the first end of the first protection module is electrically connected with the second power supply; the control end of the second protection module is electrically connected with the second end of the first protection module, the first end is electrically connected with the grounding end, and the second end is electrically connected with the control end of the control module. According to the embodiment of the invention, the self-recovery short-circuit protection of the digital control power supply output circuit can be effectively realized.

Description

Technical Field

[0001] The present application belongs to the field of power electronics technology, and in particular, relates to a digital control power output circuit and a digital control power output device. Background Art

[0002] Generally, in the field of power electronics, a digitally controlled power output circuit refers to a circuit system that uses digital technology to manage and adjust the power output. The digitally controlled power output circuit usually uses digital signals to control the switching state and frequency of the switching power supply, thereby transmitting the power supply voltage to the load for power supply. In the digitally controlled power output circuit, since the load is prone to positive short-to-ground faults, it is necessary to set a short-to-ground protection function in the circuit to promptly cut off the transmission path from the power supply voltage to the load when a short-to-ground abnormality occurs in the load.

[0003] However, although the short-to-ground protection in the prior art can forcibly disconnect the transmission path from the power supply voltage to the load for protection when the load sends a short-to-ground abnormality, it cannot automatically restore the on-off of the transmission path from the power supply voltage to the load to the original state flexibly controlled by the digital signal after the load short-to-ground abnormality is restored. In this way, the traditional digital control power supply output circuit lacks the self-recovery short-to-ground protection function, which brings inconvenience to the power supply output and load power supply under digital control. Summary of the invention

[0004] The embodiments of the present application provide a digitally controlled power supply output circuit and a digitally controlled power supply output device, which can effectively implement self-recovery short-to-ground protection of the digitally controlled power supply output circuit.

[0005] In a first aspect, an embodiment of the present application provides a digitally controlled power output circuit, the digitally controlled power output circuit comprising:

[0006] An output module, wherein a first end of the output module is electrically connected to the first power source, and a second end of the output module is electrically connected to the load;

[0007] A control module, wherein a control end of the control module is electrically connected to the digital signal output end, a first end of the control module is electrically connected to the ground end, and a second end of the control module is electrically connected to the control end of the output module;

[0008] A short-to-ground self-recovery module, wherein a control end of the short-to-ground self-recovery module is electrically connected to the digital signal output end, and a first end of the short-to-ground self-recovery module is electrically connected to the load;

[0009] A first protection module, wherein a control end of the first protection module is electrically connected to a second end of the short-to-ground self-recovery module, and a first end of the first protection module is electrically connected to a second power supply;

[0010] a second protection module, wherein a control end of the second protection module is electrically connected to a second end of the first protection module, a first end of the second protection module is electrically connected to a ground end, and a second end of the second protection module is electrically connected to a control end of the control module;

[0011] When a short-to-ground fault occurs in the load, the short-to-ground self-recovery module conducts in the reverse direction, and the first protection module and the second protection module conduct, so that the control module and the output module are cut off;

[0012] When the short-to-ground abnormality of the load is restored, the short-to-ground self-recovery module is turned off, and the first protection module and the second protection module are turned off, so that the control module and the output module are turned on or off according to the digital signal output by the digital signal output terminal.

[0013] In some possible implementations, the short-to-ground self-recovery module includes a first transistor, and the first transistor is an NPN transistor;

[0014] The base of the first transistor is the control terminal of the first transistor, the collector of the first transistor is the first terminal of the short-to-ground self-recovery protection module, and the emitter of the first transistor is the second terminal of the short-to-ground self-recovery protection module.

[0015] In some possible implementations, the first protection module includes a first switch unit and a first voltage dividing unit;

[0016] The control end of the first switch unit is electrically connected to the second end of the short-to-ground self-recovery module, the first end of the first switch unit is electrically connected to the second power supply, and the second end of the first switch unit is electrically connected to the control end of the second protection module;

[0017] The first voltage dividing unit is electrically connected between the first end and the control end of the first switch module.

[0018] In some possible implementations, the first switch unit is a first transistor, the first transistor is an N-type MOS tube, and the first voltage dividing unit is a first resistor;

[0019] The gate of the first transistor is the control terminal of the first switch unit, the source of the first transistor is the first terminal of the first switch unit, and the drain of the first transistor is the second terminal of the first switch unit;

[0020] The first resistor is electrically connected between the gate and the source of the first transistor.

[0021] In some possible implementations, the second protection module includes a second switch unit and a second voltage dividing unit;

[0022] The control end of the second switch unit is electrically connected to the second end of the first protection module, the first end of the second switch unit is electrically connected to the ground end, and the second end of the second switch unit is electrically connected to the control end of the control module;

[0023] The second voltage dividing unit is electrically connected between the control end and the first end of the second switch unit.

[0024] In some possible implementations, the second switch unit is a second transistor, the second transistor is an NPN transistor, and the second voltage divider unit is a second resistor;

[0025] The base of the second triode is the control end of the second switch unit, the emitter of the second triode is the first end of the second switch unit, and the collector of the second triode is the second end of the second switch unit;

[0026] The second resistor is electrically connected between the base and the emitter of the second transistor.

[0027] In some possible implementations, the output module includes a third switch unit and a third voltage dividing unit, and the control module includes a fourth switch unit and a fourth voltage dividing unit;

[0028] A first end of the third switch unit is electrically connected to the first power supply, and a second end of the third switch unit is electrically connected to the load;

[0029] The third voltage dividing unit is arranged between the control end and the first end of the third switch unit;

[0030] The control end of the fourth switch unit is electrically connected to the digital signal output end, the first end of the fourth switch unit is electrically connected to the ground end, and the second end of the fourth switch unit is electrically connected to the control end of the third switch unit;

[0031] The fourth voltage dividing unit is arranged between the control end and the first end of the fourth switch unit.

[0032] In some possible implementations, the third switch unit is a third triode, the third triode is a PNP triode, and the third voltage divider unit includes a third resistor; the fourth switch unit is a fourth triode, the fourth triode is an NPN triode, and the fourth voltage divider unit includes a fourth resistor;

[0033] The base of the third triode is the control end of the third switch unit, the emitter of the third triode is the first end of the third switch unit, and the collector of the third triode is the second end of the third switch unit;

[0034] The third resistor is electrically connected between the base and the emitter of the third transistor;

[0035] The base of the fourth triode is the control end of the fourth switch unit, the emitter of the fourth triode is the first end of the fourth switch unit, and the collector of the fourth triode is the second end of the fourth switch unit;

[0036] The fourth resistor is electrically connected between the base and the emitter of the fourth transistor.

[0037] In some possible implementations, the digitally controlled power supply output circuit further includes a current limiting module;

[0038] The first end of the current limiting module is electrically connected to the control end of the output module, and the second end of the current limiting module is electrically connected to the second end of the control module.

[0039] In some possible implementations, the digitally controlled power output circuit further includes a fifth resistor;

[0040] A first end of the fifth resistor is electrically connected to the digital signal output end, and a second end of the fifth resistor is electrically connected to the output end of the control module.

[0041] In some possible implementations, the digitally controlled power output circuit further includes a first capacitor;

[0042] The first electrode of the first capacitor is electrically connected to the control end of the control module, and the second end of the first capacitor is electrically connected to the ground end.

[0043] In some possible implementations, the digitally controlled power output circuit further includes a second capacitor and a sixth resistor;

[0044] A first electrode of the second capacitor is electrically connected to the control end of the short-to-ground self-recovery module, and a second electrode of the second capacitor is electrically connected to the ground end;

[0045] A first end of the sixth resistor is electrically connected to the digital signal output end, and a second end of the sixth resistor is electrically connected to the control end of the short-to-ground self-recovery module.

[0046] In some possible implementations, the digitally controlled power output circuit further includes a seventh resistor;

[0047] The seventh resistor is arranged between the second end of the second protection module and the control end of the control module;

[0048] And / or, the digitally controlled power output circuit further includes an eighth resistor;

[0049] The eighth resistor is arranged between the first end of the first protection module and the second power supply.

[0050] In some possible implementations, the digitally controlled power output circuit further includes a third capacitor;

[0051] The third capacitor is arranged between the first terminal and the control terminal of the output module.

[0052] In some possible implementations, the digital control power supply output circuit further includes a power supply output network; the power supply output network includes a fourth capacitor and a bidirectional transient voltage suppression diode;

[0053] The fourth capacitor is arranged between the second terminal of the output module and the ground terminal;

[0054] The bidirectional transient voltage suppression diode is arranged in parallel at both ends of the fourth capacitor.

[0055] Based on the same inventive concept, in a second aspect, an embodiment of the present application provides a digitally controlled power output device, which includes a digitally controlled power output circuit as provided in any embodiment of the first aspect of the present application.

[0056] It can be known from the above description that a digital control power supply output circuit and a digital control power supply output device provided by the embodiment of the present application are provided with a short-to-ground self-recovery module, a first protection module and a second protection module. When the control module is turned on and the load has a short-to-ground abnormality, the short-to-ground self-recovery module is reversely conducted, and the current flows from the load to the control end of the first protection module. The first protection module is turned on when the short-to-ground self-recovery module is reversely conducted, so that the second protection module is turned on, thereby lowering the potential of the control end of the control module. The control module is turned off so that the output module is turned off and the load is stopped from being supplied with power to avoid damage to the circuit when the load is abnormal. When the short-to-ground abnormality of the load is restored, the short-to-ground self-recovery module is turned off, and the first protection module and the second protection module are turned off, so that the control module is no longer turned off under the conduction of the second protection module. The conduction or shutdown of the control module and the output module is determined by the digital signal output from the digital signal output terminal, and the circuit can autonomously restore the power supply voltage to the normal output of the load.

[0057] Compared with the prior art, a digital control power supply output circuit and a digital control power supply output device in the embodiment of the present application, on the premise of having the function of controlling the output power supply by a digital signal, also have a self-recovering short-to-ground protection function. It utilizes the reverse conduction characteristics of the short-to-ground self-recovery module, and cooperates with the first protection module and the second module, so as to effectively control the above-mentioned control module and the output module to be cut off when a short-to-ground abnormality occurs in the load. After the load recovers from the short-to-ground abnormality to the normal state, the digital control power supply output circuit and the digital control power supply output device in the embodiment of the present application can directly and autonomously realize the self-recovering short-to-ground protection of the circuit, and can enable the output module and the control module to restore the normal power output operation of the digital control power supply output circuit without external adjustment, so that it can flexibly deal with fault conditions in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0059] Figure 1is a structural schematic diagram of a digital control power supply output circuit provided in an embodiment of the present application;

[0060] Figure 2 is a structural flow diagram of a digital control power supply output circuit provided by another embodiment of the present application;

[0061] Figure 3 is a structural schematic diagram of a digital control power supply output circuit provided by another embodiment of the present application;

[0062] Figure 4 is a structural schematic diagram of a digital control power supply output circuit provided by another embodiment of the present application;

[0063] Figure 5 is a structural schematic diagram of a digital control power supply output circuit provided by another embodiment of the present application;

[0064] Figure 6 is a structural schematic diagram of a digital control power supply output circuit provided by another embodiment of the present application;

[0065] Figure 7 It is a structural schematic diagram of a digital control power output device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0066] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0067] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0068] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0069] It should be noted that the transistor in the embodiment of the present application can be an N-type transistor or a P-type transistor. For an N-type transistor, the on-level is a high level and the off-level is a low level. That is, when the gate of the N-type transistor is at a high level, the first and second poles thereof are connected, and when the gate of the N-type transistor is at a low level, the first and second poles thereof are disconnected. For a P-type transistor, the on-level is a low level and the off-level is a high level. That is, when the control pole of the P-type transistor is at a low level, the first and second poles thereof are connected, and when the control terminal of the P-type transistor is at a high level, the first and second poles thereof are disconnected. In a specific implementation, the gate of each of the above-mentioned transistors is used as its control pole, and, according to the signal of the gate of each transistor and its type, the first pole thereof can be used as the source and the second pole as the drain, or the first pole thereof can be used as the drain and the second pole as the source, and no distinction is made here. In addition, the on-level and the off-level in the embodiment of the present invention are both general terms, and the on-level refers to any level that can turn on the transistor, and the off-level refers to any level that can turn off / turn off the transistor.

[0070] In the embodiments of the present application, the term “electrically connected” may refer to a direct electrical connection between two components, or may refer to an electrical connection between two components via one or more other components.

[0071] In the embodiment of the present application, the first node, the second node and the third node are only defined for the convenience of describing the circuit structure, and the first node, the second node and the third node are not actual circuit units.

[0072] It is obvious to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit or scope of the present application. Therefore, the present application is intended to cover modifications and changes of the present application that fall within the scope of the corresponding claims (technical solutions for protection) and their equivalents. It should be noted that the implementation methods provided in the embodiments of the present application can be combined with each other without contradiction.

[0073] Before describing the technical solutions provided by the embodiments of the present application, in order to facilitate the understanding of the embodiments of the present application, the present application first specifically describes the problems existing in the related art:

[0074] As mentioned above, the inventor of the present application has found that the short-to-ground protection in the prior art can forcibly disconnect the transmission path from the power supply voltage to the load for protection when the load sends a short-to-ground abnormality. However, after the load short-to-ground abnormality is restored, the traditional circuit needs to rely on the control chip such as MCU (Microcontroller Unit) electrically connected to the outside to resend the control signal so that the circuit can restore normal power output. However, the existing circuit cannot realize the function of transmitting the short-to-ground fault to the MCU, so after the power output is short-to-ground, the automatic control of the MCU output signal cannot be realized by the program, which brings inconvenience to the power output and load power supply under digital control.

[0075] In view of the above, how to provide a digital control power supply output circuit with a self-recovery short-to-ground protection function is a problem that needs to be solved urgently in the industry.

[0076] In order to solve the above technical problems, the embodiments of the present application provide a digital control power output circuit and a digital control power output device, which solves the problem that the output power positive network in the current digital control power output circuit cannot automatically restore the power output. The digital control power output circuit provided by the embodiments of the present application is first introduced below.

[0077] Figure 1 1 is a schematic diagram of the structure of a digital control power output circuit 100 provided in an embodiment of the present application. Figure 1 As shown, the embodiment of the present application provides a digital control power output circuit 100, such as Figure 1 As shown, the digital control power output circuit 100 of the embodiment of the present application includes:

[0078] The output module 10 has a first end electrically connected to a first power source DC1, and a second end electrically connected to a load. The first power source DC1 may be a DC voltage source, and the DC voltage provided by the first power source DC1 may be, for example, 12V, which is not strictly limited here.

[0079] The control module 20, the control end of the control module 20 is electrically connected to the digital signal output end, the first end of the control module 20 is electrically connected to the ground end GND, and the second end of the control module 20 is electrically connected to the control end of the output module 10. The digital signal output end can control the power output by outputting a high level signal or a low level signal under the control of a digital control core such as DSP (Digital Signal Process) and MCU. The high level signal is such as 3.3V, and the low level signal is such as 5V.

[0080] The short-to-ground self-recovery module 30 has a control end electrically connected to the digital signal output end, and a first end electrically connected to the load.

[0081] The first protection module 40 has a control end electrically connected to the second end of the short-to-ground self-recovery module 30 , and a first end electrically connected to the second power supply DC2 .

[0082] The second protection module 50, the control end of the second protection module 50 is electrically connected to the second end of the first protection module 40, the first end of the second protection module 50 is electrically connected to the ground end GND, and the second end of the second protection module 50 is electrically connected to the control end of the control module 20. The second power supply DC2 can be a DC voltage source, and the magnitude of the DC voltage provided by the second power supply DC2 is, for example, 5V or other magnitudes, which are not strictly limited here.

[0083] In the case of a short-to-ground abnormality in the load, the short-to-ground self-recovery module 30 is reversely conducted, and the first protection module 40 and the second protection module 50 are turned on, so that the control module 20 and the output module 10 are cut off. The short-to-ground abnormality in the load may include a short circuit between the positive electrode of the load and the ground terminal GND. In other words, the short-to-ground abnormality in the load may refer to a short circuit between the node originally connected to the positive electrode of the power supply, that is, the output node (positive electrode of the load) from the positive electrode of the power supply to the load is shorted to the ground.

[0084] Specifically, when the control module 20 is turned on and the load has a short-to-ground abnormality, the short-to-ground self-recovery module 30 is reversely turned on. The first protection module 40 is turned on when the short-to-ground self-recovery module 30 is reversely turned on, thereby providing a conduction level for the control end of the second protection module 50. The second protection module is turned on, and the control end of the output module 20 is grounded, thereby lowering the potential of the control end of the control module 20, so that the control module 20 is turned off. The control module 20 is turned off, so that the output module 10 is turned off and the power supply to the load is stopped, so as to avoid damage to the circuit when the load has a short-to-ground abnormality.

[0085] When the short-to-ground abnormality of the load is restored, the short-to-ground self-recovery module 30 is turned off (no current passes through the state). After the short-to-ground self-recovery module 30 is turned off, the first protection module 40 and the second protection module 50 are turned off, and the control module 20 and the output module 10 are turned on or off according to the digital signal output from the digital signal output terminal.

[0086] It should be added that the module cut-off in the embodiment of the present application can be understood as the module being in a state where no current flows through. Conversely, the module turn-on can be understood as the module being in a state where current flows through, that is, current flows from one end to the other end.

[0087] Specifically, when the short-to-ground abnormality of the load is restored, the reverse conduction of the short-to-ground self-recovery module 30 ends, the short-to-ground self-recovery module 30 is turned off, the first protection module 40 and the second protection module 50 are turned off, and the digital control power supply output circuit 100 is restored from the short-to-ground protection state, so that the control module 20 is no longer turned off under the conduction of the second protection module 50. The on or off of the control module 20 and the output module 10 is determined by the digital signal output from the digital signal output terminal, and the circuit can autonomously restore the power supply voltage to the normal output control state of the load, thereby realizing flexible adjustment of the power supply output, rather than continuously maintaining the forced off state under the action of the short-to-ground protection.

[0088] A digital control power supply output circuit 100 with a short-to-ground self-recovery function provided in an embodiment of the present application can flexibly cope with fault conditions in practical applications, reducing the complexity and inconvenience caused by the short-to-ground recovery operation performed externally. Compared with the prior art, a digital control power supply output circuit 100 in an embodiment of the present application, under the premise of having the function of controlling the output power supply by a digital signal, also has a self-recovering short-to-ground protection function. It effectively controls the above-mentioned control module 20 and output module 10 to be cut off when a short-to-ground abnormality occurs in the load by utilizing the reverse conduction characteristics of the short-to-ground self-recovery module 30, and cooperates with the first protection module 40 and the second module. After the load is restored to a normal state from the short-to-ground abnormality, the digital control power supply output circuit 100 in the embodiment of the present application can directly and autonomously realize the self-recovery short-to-ground protection of the circuit, and can enable the output module 10 and the control module 20 to restore the normal power output work of the digital control power supply output circuit without external adjustment.

[0089] See below Figure 2 , Figure 2 FIG. 1 is a schematic diagram of a digital control power output circuit 100 provided in another embodiment of the present application. Figure 2 As shown, optionally, in some feasible embodiments of the present application, in order to more reasonably realize the short-to-ground protection and self-recovery functions of the short-to-ground self-recovery module 30, the short-to-ground self-recovery module 30 includes a first transistor, and the first transistor is an NPN transistor. The first transistor can be seen in Figure 2 The NPN transistor Q3 in.

[0090] The base of the first transistor Q3 is the control end of the first transistor Q3 , the collector of the first transistor Q3 is the first end of the short-to-ground self-recovery protection module, and the emitter of the first transistor Q3 is the second end of the short-to-ground self-recovery protection module.

[0091] In this embodiment, when the load is short-circuited to ground, the positive electrode of the load is grounded, the collector of the first transistor Q3 is grounded, the emitter is connected to the positive power supply, and the base voltage is lower than the reverse breakdown voltage, and the first transistor Q3 is equivalent to a low resistance. Based on the reverse conduction characteristic of the collector-base junction of the first transistor Q3, the load is protected when it is abnormal, and can be restored from the reverse conduction state after the load short-circuited to ground is restored, thereby restoring the power supply to the load.

[0092] Please continue to see Figure 2 Optionally, in some feasible embodiments of the present application, in order to more reasonably implement the short-to-ground protection and self-recovery functions of the first protection module 40, the first protection module 40 includes a first switch unit and a first voltage divider unit.

[0093] The control end of the first switch unit is electrically connected to the second end of the short-to-ground self-recovery module 30 , the first end of the first switch unit is electrically connected to the second power supply DC2 , and the second end of the first switch unit is electrically connected to the control end of the second protection module 50 .

[0094] The first voltage dividing unit is electrically connected between the first end and the control end of the first switch module.

[0095] The above-mentioned first switch unit and the switch units involved later (such as the second switch unit, etc.) can be implemented by semiconductor switching devices such as transistors, IGBTs (Insulated Gate Bipolar Transistors), MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) or triodes, and no strict restrictions are made here.

[0096] More specifically, the first switch unit is a first transistor, and the first transistor is an N-type MOS tube. The first voltage dividing unit is a first resistor. The first transistor can be referred to as Figure 2 The N-type MOS tube Q5 in the first resistor can correspond to Figure 2 The resistor R8 in.

[0097] The gate of the first transistor Q5 is the control terminal of the first switch unit, the source of the first transistor Q5 is the first terminal of the first switch unit, and the drain of the first transistor Q5 is the second terminal of the first switch unit.

[0098] The first resistor R8 is electrically connected between the gate and the source of the first transistor Q5.

[0099] In this embodiment, the function of the first protection module 40 is realized by using an N-type MOS transistor Q5 and a resistor R8. When the load is powered normally, the first transistor Q3 is turned off, and there is no current in the circuit between the gate and source of the first transistor Q5. Therefore, the gate and source have equal potentials, and the first transistor Q5 remains turned off.

[0100] In the case of a short-to-ground abnormality in the load, the first transistor Q3 conducts in reverse, so that a current loop is formed between the short-to-ground load, the first transistor Q3, the first resistor R8, and the second power supply DC2. A potential difference appears across the first resistor R8, and the potential difference between the gate and source of the first transistor Q5 reaches the conduction condition, and the first transistor Q5 is turned on. After the first transistor Q5 is turned on, it can be used for subsequent control to stop supplying power to the load.

[0101] After the short-to-ground abnormality of the load disappears, the reverse conduction phenomenon of the first transistor Q3 disappears and the first transistor Q3 is turned off, and the gate-source state of the first transistor Q5 is restored to no current and no voltage difference. The first transistor Q5 is turned off, which is conducive to restoring the power supply to the load.

[0102] Please continue to see Figure 2 Optionally, in some feasible embodiments of the present application, in order to more reasonably implement the short-to-ground protection and self-recovery functions of the second protection module 50, the second protection module 50 includes a second switch unit and a second voltage divider unit.

[0103] The control end of the second switch unit is electrically connected to the second end of the first protection module 40 , the first end of the second switch unit is electrically connected to the ground end GND, and the second end of the second switch unit is electrically connected to the control end of the control module 20 .

[0104] The second voltage dividing unit is electrically connected between the control end and the first end of the second switch unit.

[0105] More specifically, the second switch unit is a second triode, and the second triode is an NPN triode. The second voltage divider unit is a second resistor. The second triode can be referred to as Figure 2 The NPN transistor Q4 in the second resistor can correspond to Figure 2 The resistor R7 in.

[0106] The base of the second triode is the control end of the second switch unit, the emitter of the second triode is the first end of the second switch unit, and the collector of the second triode is the second end of the second switch unit.

[0107] The second resistor is electrically connected between the base and the emitter of the second transistor.

[0108] In this embodiment, the function of the second protection module 50 is realized by using an NPN transistor Q4 and a resistor R7. When the load is powered normally, the first transistor Q5 is turned off, there is no current across the second resistor R7, the voltage difference between the base and the emitter of the second transistor Q4 does not meet the conduction condition, and the second transistor Q4 remains in the off state.

[0109] In the case of a short-to-ground abnormality in the load, the first transistor Q5 is turned on, and a complete conduction loop is formed between the second power supply DC2, the turned-on first transistor Q5, the second resistor R7 and the ground terminal GND, and the current flows through the second resistor R7, and a voltage difference appears across the second resistor R7. The base voltage of the second transistor Q4 is greater than the emitter voltage, and the voltage difference between the base and the emitter reaches the conduction condition of the second transistor Q4, so the second transistor Q4 is turned on. The second transistor Q4 is turned on, which can be used to control the stop of power supply output to the load.

[0110] After the short-to-ground abnormality of the load disappears, the first transistor Q5 is turned off, and there is substantially no voltage difference between the base and the emitter of the second transistor Q4. Therefore, the second transistor Q4 is turned off, and the circuit can subsequently resume normal power supply to the load.

[0111] Please continue to see Figure 2 Optionally, in some feasible embodiments of the present application, in order to more reasonably implement the power output control function of the output module 10 and the control module 20, the output module 10 includes a third switch unit and a third voltage divider unit, and the control module 20 includes a fourth switch unit and a fourth voltage divider unit.

[0112] A first end of the third switch unit is electrically connected to the first power source DC1 , and a second end of the third switch unit is electrically connected to the load.

[0113] The third voltage dividing unit is arranged between the control end and the first end of the third switch unit.

[0114] The control end of the fourth switch unit is electrically connected to the digital signal output end, the first end of the fourth switch unit is electrically connected to the ground end GND, and the second end of the fourth switch unit is electrically connected to the control end of the third switch unit.

[0115] The fourth voltage dividing unit is arranged between the control end and the first end of the fourth switch unit.

[0116] More specifically, the third switch unit is a third transistor, the third transistor is a PNP transistor, and the third voltage divider unit includes a third resistor. The fourth switch unit is a fourth transistor, the fourth transistor is an NPN transistor, and the fourth voltage divider unit includes a fourth resistor. Figure 2 The PNP transistor Q1 in the third resistor can correspond to Figure 2The fourth transistor can be seen in Figure 2 The NPN transistor Q2 in the fourth resistor can correspond to Figure 2 The resistor R2 in.

[0117] The base of the third triode Q1 is the control end of the third switch unit, the emitter of the third triode Q1 is the first end of the third switch unit, and the collector of the third triode Q1 is the second end of the third switch unit.

[0118] The third resistor R4 is electrically connected between the base and the emitter of the third transistor Q1 .

[0119] The base of the fourth triode Q2 is the control end of the fourth switch unit, the emitter of the fourth triode Q2 is the first end of the fourth switch unit, and the collector of the fourth triode Q2 is the second end of the fourth switch unit;

[0120] The fourth resistor R2 is electrically connected between the base and the emitter of the fourth transistor.

[0121] In this embodiment, if the load does not have a short-to-ground abnormality, the first transistor Q3, the first transistor Q5 and the second transistor Q4 are all turned off. The base potential of the fourth transistor Q2 is determined by the potential output by the digital signal output terminal. When the digital signal output terminal is at a high level (for example, 3.3V) and the power supply is required to supply power to the load normally, a loop through which current flows is formed between the digital output signal terminal, the fourth resistor R2 and the ground terminal GND. The base voltage of the fourth transistor Q2 is greater than the emitter voltage, and the conduction condition of the fourth transistor Q2 is met, and the fourth transistor Q2 is turned on.

[0122] At this time, the first power supply DC1 reaches the ground terminal GND through the third resistor R4 and the turned-on fourth transistor Q2. The base voltage of the third transistor Q1 is pulled down, and the base voltage of the third PNP transistor Q1 is less than the emitter voltage and reaches the conduction condition, so that the third transistor Q1 is turned on, and the voltage output of the first power supply DC1 reaches the load through the third transistor Q1, thereby realizing power output.

[0123] In the case of an abnormal short-to-ground load, the base of the fourth transistor Q2 is pulled down to nearly 0, and the voltage difference between the base and the emitter of the fourth transistor Q2 no longer meets the conduction condition, and the fourth transistor Q2 is turned off. The current in the third resistor R4 disappears, there is no voltage difference between its two ends, and the third transistor Q1 is turned off. In this way, the power supply from the power supply to the load is stopped when the load is abnormally short-to-ground, avoiding damage to the circuit.

[0124] After the short-to-ground abnormality of the load is eliminated, the first transistor Q3, the first transistor Q5 and the second transistor Q4 are turned off again. The base potential of the fourth transistor Q2 is restored to a state determined by the potential output by the digital signal output terminal. When the digital signal output terminal is still at a high level, a loop through which current flows is formed between the digital output signal terminal, the fourth resistor R2 and the ground terminal GND. The base voltage of the fourth transistor Q2 is greater than the emitter voltage, and the conduction condition of the fourth transistor Q2 is reached. The fourth transistor Q2 is turned on, thereby prompting the third transistor Q1 to resume conduction, and the circuit resumes normal power output to the load.

[0125] Optionally, in some feasible embodiments of the present application, considering that at the moment when the load is short-circuited, before the third transistor Q1 is turned off, there will be a short current spike flowing from the emitter of Q1 to the collector, which may cause damage to the Q1 device. Therefore, in order to fully improve the safety of circuit devices and circuit reliability, the digital control power supply output circuit 100 also includes a current limiting module 60.

[0126] A first end of the current limiting module 60 is electrically connected to the control end of the output module 10 , and a second end of the current limiting module 60 is electrically connected to the second end of the control module 20 .

[0127] Combination Figure 2 The current limiting module 60 can be implemented by using a resistor, for example Figure 2 In this embodiment, the resistor R3 is set in the circuit to limit the current. By adjusting the resistance value of the resistor R3, the base current of the resistor Q1 can be limited, thereby controlling the value of the peak current flowing through the collector of the transistor Q1 when the ground is shorted.

[0128] It should be added that, for transistors with different collector currents, the resistance of the resistor R3 needs to be adjusted so that the short-term peak current is within the tolerance range of the third transistor Q1. A larger resistance of the third resistor R3 can improve the limitation of the base current of the third transistor Q3, thereby helping to further improve the reliability of the digital control power output circuit 100.

[0129] Optionally, in some feasible embodiments of the present application, in order to better realize the second protection module 50 pulling down the control terminal potential of the control module 20 when the load is short-circuited, the digital control power supply output circuit 100 may further include a fifth resistor. The fifth resistor can be seen in Figure 2 The resistor R1 in.

[0130] A first end of the fifth resistor R1 is electrically connected to the digital signal output end, and a second end of the fifth resistor R1 is electrically connected to the output end of the control module 20 .

[0131] In this embodiment, the fifth resistor R1 can ensure that the base of the fourth transistor Q2 in the second protection module 50 can be smoothly pulled down to GND, so as to prevent the base of the fourth transistor Q2 from continuously providing a low-level voltage at the digital signal output terminal.

[0132] See below Figure 3 , Figure 3 FIG. 1 is a schematic diagram of a digital control power output circuit 100 provided in another embodiment of the present application. Figure 3 As shown, optionally, considering the delay requirement of the circuit in digital signal control, in order to achieve more accurate and stable digital control, in some feasible embodiments of the present application, the digital control power supply output circuit 100 also includes a first capacitor. The first capacitor may correspond to Figure 3 The capacitor C1 in.

[0133] A first electrode of the first capacitor C1 is electrically connected to a control terminal of the control module 20 , and a second terminal of the first capacitor C1 is electrically connected to a ground terminal GND.

[0134] In this embodiment, the first capacitor C1 and the fifth resistor R1 form an RC circuit, which can be used to jointly adjust the response time of the circuit of the load power output control part (the output module 10 and the control module 20).

[0135] By controlling the capacitance of the first capacitor C1 and / or the resistance of the fifth resistor R1, the delay time of the circuit response can be effectively controlled, thereby facilitating precise control of the circuit power output and facilitating safer and more reliable power output supply.

[0136] Optionally, in some feasible embodiments of the present application, the digital control power output circuit 100 further includes a second capacitor and a sixth resistor. Figure 3 The capacitor C2 in the figure, the sixth resistor can correspond to Figure 3 The resistor R5 in.

[0137] A first electrode of the second capacitor C2 is electrically connected to the control end of the short-to-ground self-recovery module 30 , and a second electrode of the second capacitor C2 is electrically connected to the ground end GND.

[0138] A first end of the sixth resistor R5 is electrically connected to the digital signal output end, and a second end of the sixth resistor R5 is electrically connected to the control end of the short-to-ground self-recovery module 30 .

[0139] In this embodiment, the second capacitor C2 and the sixth resistor R5 form an RC circuit, which can be used to jointly adjust the response time of the short-to-ground protection and self-recovery circuits (short-to-ground self-recovery module 30, the first protection module 40 and the second protection module 50). For example, in a delay circuit, the RC circuit can be used to control the delay time. When the input signal arrives, the capacitor will start to charge, and the resistor will limit the capacitor charging speed to a constant value. When the voltage of the capacitor reaches a certain value, the circuit output signal will be triggered.

[0140] By controlling the capacitance of the second capacitor C2 and / or the resistance of the sixth resistor R5, the delay time of the response of this part of the circuit can be effectively controlled, thereby helping to more stably and reliably implement the circuit short circuit protection and short circuit self-recovery function.

[0141] See below Figure 4 , Figure 4 FIG. 1 is a schematic diagram of a digital control power output circuit 100 provided in another embodiment of the present application. Figure 4 As shown, optionally, in order to further improve the reliability of the digital control power output circuit 100, in some feasible embodiments of the present application, the digital control power output circuit 100 further includes a seventh resistor. The seventh resistor can be specifically referred to in Figure 4 The resistor R6 in.

[0142] The seventh resistor R6 is disposed between the second end of the second protection module 50 and the control end of the control module 20 .

[0143] And / or, the digital control power output circuit 100 further includes an eighth resistor R9. The eighth resistor R9 can be specifically described in Figure 4 The resistor R9 in.

[0144] The eighth resistor R9 is disposed between the first end of the first protection module 40 and the second power source DC2.

[0145] In the embodiment of the present application, by setting the seventh resistor R6 and / or the eighth resistor R9, a current limiting effect can be achieved to prevent damage to the transistors in the loop due to excessive current, thereby effectively ensuring the normal operation of the devices in the circuit.

[0146] Optionally, in some feasible embodiments of the present application, the digital control power output circuit 100 further includes a third capacitor. The third capacitor may be specifically referred to in Figure 4 Capacitor C3 in.

[0147] The third capacitor C3 is arranged between the first terminal and the control terminal of the output module 10 .

[0148] In this embodiment, by setting up the third capacitor C3, the risk of mis-conduction of the transistor in the output module 10 can be effectively reduced, and the third capacitor C3 is also helpful in stabilizing the DC operating point of the transistor, thereby helping to achieve a more stable and reliable power supply output from the power supply to the load.

[0149] See below Figure 5 , Figure 5 FIG. 1 is a schematic diagram of a digital control power output circuit 100 provided in another embodiment of the present application. Figure 5 As shown, optionally, in order to improve the reliability and stability of the power output, in some feasible embodiments of the present application, the digital control power output circuit 100 also includes a power output network. The power output network includes a fourth capacitor and a bidirectional transient voltage suppression diode. The fourth capacitor can be seen in Figure 5 The capacitor C4 in the above bidirectional transient voltage suppression diode can correspond to Figure 5 The bidirectional TVS (Transient Voltage Suppressor) tube D1 in the circuit.

[0150] The fourth capacitor C4 is disposed between the second terminal of the output module 10 and the ground terminal GND.

[0151] The bidirectional transient voltage suppression diode D1 is connected in parallel at both ends of the fourth capacitor C4.

[0152] In this embodiment, the fourth capacitor C4 can play a filtering role to reduce interference, thereby ensuring stable power supply to the load. The capacitance value of the fourth capacitor C4 is, for example, 0.1uf, and its capacitance value can be set according to actual needs. The bidirectional transient voltage suppression diode D1 can be used as a protection device to protect the components in the digital control power output circuit 100 from damage, and can further improve the reliability of the digital control power output circuit 100.

[0153] In order to facilitate a more intuitive understanding of the protection circuit of the power switch tube provided in the above embodiment, a complete embodiment is used as an example to illustrate the protection circuit as a whole. Figure 5 The digital control power supply output circuit 100 with short-to-ground protection and self-recovery functions proposed in the embodiment of the present application is specifically mainly composed of a power supply output switch control part, a short-to-ground protection part, and a power supply output part. Among them, the power supply output switch control part realizes the output or non-output control of the voltage provided by the power supply part. The short-to-ground protection part realizes the protection of the key switches in the power supply output switch control part, and at the same time can ensure that the function of the control circuit outputting power can continue to be realized after the short-to-ground fault is eliminated. The power supply output part connects the power supply output switch control part and the short-to-ground protection part to realize the output of power supply.

[0154] The power output switch control part outputs a high level or low level control signal through a digital signal output device to realize whether the first power supply DC1 is output to the outside, and the first power supply DC1 is, for example, a 12V power supply. Figure 5 As shown, the power output switch control part is composed of a PNP transistor Q1, an NPN transistor Q2, four resistors R1, R2, R3, R4 and capacitors C1 and C3.

[0155] The power output switch control part is electrically connected to the digital signal output terminal, and can control the power output according to the level of the digital signal output terminal. In this embodiment, when the network on the left side of the resistor R1 is a high level signal (for example, 3.3V), the load will be powered. When the network on the left side of the resistor R1 is a low level, the power supply to the load is disconnected.

[0156] The circuit of the short-to-ground protection part is composed of NPN transistor Q3, NPN transistor Q4, NMOS transistor Q5, resistors R5, R6, R7, R8, R9, and capacitor C2. One end of resistor R9 can be electrically connected to the second power supply DC2, which is, for example, a 5V power supply.

[0157] The power output part includes capacitor C4 and bidirectional TVS tube D1, one side of which is connected to the power output control module and the other side is connected to the load to provide power supply for the load.

[0158] In specific operation, when the digital signal output terminal outputs a high-level signal (such as 3.3V), the voltage is first divided between the resistor R1 and the resistor R2, so that the base voltage of the NPN transistor Q2 is greater than the emitter voltage, and at the same time, the conduction condition of Q2 is met, so that Q2 is turned on. After Q2 is turned on, the current is from the first power supply DC1 through the resistors R4, R3, and the turned-on NPN transistor Q2 to the ground terminal GND, and the voltage output by the first power supply DC1 is divided on the resistor R4. By adjusting the resistance distribution of R4 and R3, the PNP transistor Q1 can also reach the conduction condition after Q2 is turned on. After the PNP transistor Q1 is turned on, the unit voltage output of the first power supply DC1 passes through Q1 to the power output part, thereby realizing the power supply to the load.

[0159] When the digital signal output terminal sends a high-level signal, and the power output part of the circuit or the positive electrode of the load power supply is not short-connected to the ground terminal GND, the base voltage of the NPN transistor Q3 in the short-to-ground protection part is the high level of the digital signal output, which is 3.3V. The emitter voltage of the NPN transistor Q3 comes from the voltage obtained by the second power supply DC2 through the resistor R8 and the resistor R9 circuit. At this time, there is no current in this part of the circuit (the resistor R8 and the resistor R9 circuit), so the emitter voltage of the NPN transistor Q3 is equal to the voltage value of the second power supply DC2, which is 5V. At this time, there is no voltage difference between the gate and the source of the NMOS tube Q5, and the NMOS tube is not turned on. Therefore, in this case, the voltages of the drain of NMOS Q5 (i.e., the base of the NPN transistor Q4) and the emitter of the NPN transistor Q4 are both 0V, and the NPN transistor Q4 is not turned on at this time, and the short-to-ground protection part of the circuit does not work.

[0160] See below Figure 6 , Figure 6 FIG. 1 is a schematic diagram of a digital control power supply output circuit provided by another embodiment of the present application. Figure 6 As shown in the figure, when the digital signal output terminal sends a high-level signal and the load is short-connected to the ground, that is, the power output terminal (positive pole of the load) is short-connected to the ground, the collector voltage of the NPN transistor Q3 becomes 0V. Since the emitter voltage of the NPN transistor Q3 is 5V and the collector voltage is 0V, it will be reversely conducted in this case, and a small current will flow from the emitter of Q3 to the collector instantly, and the emitter voltage of Q3 will change from 5V to 0V.

[0161] Therefore, the voltage of the second power supply DC2 passes through resistors R9, R8, and the turned-on transistor Q3 to reach the power output network part. At this time, the voltage of the second power supply DC2 is mainly divided between resistors R8 and R9. The voltage divided at both ends of resistor R8 makes the NMOS tube Q5 reach the conduction condition, and Q5 is turned on. After Q5 is turned on, the current flows through the turned-on Q5 and resistor R7 to the ground terminal GND. Then, the drain voltage of Q5 changes from 0V to the divided voltage of resistor R7, so that the NPN transistor Q4 reaches the conduction condition, and Q4 is turned on. Resistor R6 plays a current limiting role after Q4 is turned on. After Q4 is turned on, the base voltage of Q2 is pulled down to the ground terminal GND through R6 and Q4, becoming 0V or close to 0V. In this way, the base voltage of Q2 is pulled down and no longer meets the conduction condition, and the transistor Q2 is turned off, which makes Figure 6 The voltage across the resistor R4 is the voltage value of DC1, and there is no voltage difference across the resistor R4. Eventually, the transistor Q1 is turned off. When the short-to-ground protection circuit takes effect, the emitter of Q1 will continue to maintain the voltage value of DC1, and the collector of Q1 will continue to be grounded. The Q1 tube will not be burned due to overcurrent due to the short circuit between 12V and the ground, and the load will not be damaged.

[0162] In addition, the embodiment of the present application also considers that at the moment when the power output network is short-circuited, before Q1 is not turned off, there will be a short current spike flowing from the emitter of transistor Q1 to the collector, and the current peak value is much smaller than the current generated by the 12V short-circuit. Therefore, current limiting is performed by setting a resistor R3 in the circuit. By adjusting the resistance value of resistor R3, the base current of resistor Q1 can be limited, thereby controlling the value of the peak current flowing through the collector of transistor Q1 when short-circuited. For transistors with different collector currents that can be tolerated, it is necessary to adjust the resistance value of resistor R3 so that the short peak current is within the tolerance range of transistor Q1.

[0163] Furthermore, the capacitor C1 and the capacitor C2 in the digital control power output circuit 100 can be used to control the response time of the power switch control circuit and the short circuit protection circuit. By controlling the values ​​of the two capacitors respectively, the circuit response time is controlled. More specifically, the resistor R1 and the resistor R5 are also involved in controlling the circuit response time.

[0164] After the load short-to-ground abnormality is eliminated, it returns to Figure 5 After the situation shown, the transistor Q3 is turned off again, and the second power supply DC2 voltage no longer flows through the resistors R8 and R9, and the gate-source voltage difference of Q5 is restored to 0V, and Q5 is turned off. After Q5 is turned off, Q4 is also turned off, so that the high-level voltage output from the digital signal output terminal, through the resistor R1, then through the resistor R6, through the transistor Q4 to the ground is cut off, and the base potential of Q2 is restored to the high-level voltage output from the digital signal output terminal. The high-level voltage output from the digital signal output terminal, the current flows through the resistors R1 and R2 to the ground. Then, according to the implementation method of the previous text, Q2 is turned on, and Q1 is turned on again, thereby realizing the autonomous recovery of the power supply voltage output after the short-to-ground abnormality is eliminated.

[0165] In summary, in the embodiments of the present application, the reverse conduction characteristics of the collector junction of the NPN transistor are utilized, and an external DC source and the flexible use of MOS tubes and transistors, etc., are used to cooperate with the power output circuit. It can flexibly respond to fault conditions in actual applications, solve the problem that the output network in the current digital control power output circuit cannot automatically restore the power output, realize the function of a power supply with digital signal controlled output, and have a self-recovering short-to-ground protection function.

[0166] It is understandable that the above are all examples, and do not play a substantial role in limiting the digital control power supply output circuit 100 protected by the present application. The implementation methods of the present application include but are not limited to the specific voltage parameters and component parameters shown in the examples. The component parameters, output values ​​of the voltage source, output of the digital signal and output voltage value in the present solution can be adjusted according to the actual situation and the principles shown in the present invention to achieve the output of the power supply controlled by the digital signal with the self-recovery short-to-ground protection function.

[0167] It should be noted that in the embodiments shown in the above figures, the resistor is represented by a single resistor, and the capacitor is represented by a single capacitor. In other embodiments, the resistor may be an integration of series, parallel or mixed resistors, and the capacitor may be an integration of series, parallel or mixed capacitors. The specific parameters of each device can be set according to actual needs, and this application does not limit this.

[0168] Based on the same inventive concept, an embodiment of the present application also provides a digitally controlled power output device. Figure 7 Schematic diagram of the structure of a digital control power output device provided by an embodiment of the present application. Figure 7 The digital control power output device 1000 includes a digital control power output circuit 100 as provided in any of the aforementioned embodiments of the present application.

[0169] It should be understood that the digitally controlled power output device 1000 provided in the embodiment of the present application has the beneficial effects of the digitally controlled power output circuit 100 provided in the embodiment of the present application. For details, please refer to the specific description of the digitally controlled power output circuit 100 in the above embodiments, and this embodiment will not be repeated here.

[0170] The digital control power output device 1000 may be a device suitable for the communication industry, industrial automation, medical industry, aerospace, research and education, etc., and is not strictly limited here. For example, the digital control power output device 1000 may be provided on an electric vehicle, and the electric vehicle may further include a first power supply DC1, a second power supply DC2 and a load 200. The load 200 may be a fan or other device.

[0171] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0172] It should be clear that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. According to the embodiments described above in this application, these embodiments do not describe all the details in detail, nor do they limit the application to only the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that technicians in the relevant technical field can make good use of the application and the modified use based on the application. The application is only limited by the claims and their full scope and equivalents.

[0173] Those skilled in the art should understand that the above embodiments are illustrative rather than restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on a study of the drawings, specifications and claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other structures; the quantity involves "one" but does not exclude multiple; the terms "first" and "second" are used to identify names rather than to indicate any specific order. Any figure marks in the claims should not be construed as limiting the scope of protection. The presence of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

[0174] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the methods and core ideas of this application. The above are only preferred implementation methods of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concepts and technical solutions of this application to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A digital control power output circuit, characterized in that: The circuit comprises: An output module, wherein a first end of the output module is electrically connected to a first power source, and a second end of the output module is electrically connected to a load; A control module, wherein a control end of the control module is electrically connected to the digital signal output end, a first end of the control module is electrically connected to the ground end, and a second end of the control module is electrically connected to the control end of the output module; A short-to-ground self-recovery module, wherein a control end of the short-to-ground self-recovery module is electrically connected to the digital signal output end, and a first end of the short-to-ground self-recovery module is electrically connected to the load; A first protection module, wherein a control end of the first protection module is electrically connected to a second end of the short-to-ground self-recovery module, and a first end of the first protection module is electrically connected to a second power supply; a second protection module, wherein the control end of the second protection module is electrically connected to the second end of the first protection module, the first end of the second protection module is electrically connected to the ground end, and the second end of the second protection module is electrically connected to the control end of the control module; When the load has a short-to-ground abnormality, the short-to-ground self-recovery module is reversely conducted, and the first protection module and the second protection module are conducted, so that the control module and the output module are cut off; When the short-to-ground abnormality of the load is restored, the short-to-ground self-recovery module is turned off, and the first protection module and the second protection module are turned off, so that the control module and the output module are turned on or off according to the digital signal output by the digital signal output terminal.

2. The digital control power output circuit according to claim 1, characterized in that: The short-to-ground self-recovery module includes a first transistor, which is an NPN transistor; The base of the first transistor is the control end of the first transistor, the collector of the first transistor is the first end of the short-to-ground self-recovery protection module, and the emitter of the first transistor is the second end of the short-to-ground self-recovery protection module.

3. The digital control power output circuit according to claim 1, characterized in that: The first protection module includes a first switch unit and a first voltage dividing unit; The control end of the first switch unit is electrically connected to the second end of the short-to-ground self-recovery module, the first end of the first switch unit is electrically connected to the second power supply, and the second end of the first switch unit is electrically connected to the control end of the second protection module; The first voltage dividing unit is electrically connected between the first end and the control end of the first switch module.

4. The digital control power output circuit according to claim 3, characterized in that: The first switch unit is a first transistor, the first transistor is an N-type MOS tube, and the first voltage dividing unit is a first resistor; The gate of the first transistor is the control terminal of the first switch unit, the source of the first transistor is the first terminal of the first switch unit, and the drain of the first transistor is the second terminal of the first switch unit; The first resistor is electrically connected between the gate and the source of the first transistor.

5. The digital control power output circuit according to claim 1, characterized in that: The second protection module includes a second switch unit and a second voltage dividing unit; The control end of the second switch unit is electrically connected to the second end of the first protection module, the first end of the second switch unit is electrically connected to the ground end, and the second end of the second switch unit is electrically connected to the control end of the control module; The second voltage dividing unit is electrically connected between the control end and the first end of the second switch unit.

6. The digital control power output circuit according to claim 5, characterized in that: The second switch unit is a second transistor, the second transistor is an NPN transistor, and the second voltage dividing unit is a second resistor; The base of the second triode is the control end of the second switch unit, the emitter of the second triode is the first end of the second switch unit, and the collector of the second triode is the second end of the second switch unit; The second resistor is electrically connected between the base and the emitter of the second transistor.

7. The digital control power output circuit according to claim 1, characterized in that: The output module includes a third switch unit and a third voltage dividing unit, and the control module includes a fourth switch unit and a fourth voltage dividing unit; A first end of the third switch unit is electrically connected to the first power supply, and a second end of the third switch unit is electrically connected to the load; The third voltage dividing unit is arranged between the control end and the first end of the third switch unit; The control end of the fourth switch unit is electrically connected to the digital signal output end, the first end of the fourth switch unit is electrically connected to the ground end, and the second end of the fourth switch unit is electrically connected to the control end of the third switch unit; The fourth voltage dividing unit is arranged between the control end and the first end of the fourth switch unit.

8. The digital control power output circuit according to claim 7, characterized in that: The third switch unit is a third transistor, the third transistor is a PNP transistor, and the third voltage dividing unit includes a third resistor; the fourth switch unit is a fourth transistor, the fourth transistor is an NPN transistor, and the fourth voltage dividing unit includes a fourth resistor; The base of the third triode is the control end of the third switch unit, the emitter of the third triode is the first end of the third switch unit, and the collector of the third triode is the second end of the third switch unit; The third resistor is electrically connected between the base and the emitter of the third transistor; The base of the fourth triode is the control end of the fourth switch unit, the emitter of the fourth triode is the first end of the fourth switch unit, and the collector of the fourth triode is the second end of the fourth switch unit; The fourth resistor is electrically connected between the base and the emitter of the fourth transistor.

9. The digital control power output circuit according to claim 1, characterized in that: The circuit also includes a current limiting module; The first end of the current limiting module is electrically connected to the control end of the output module, and the second end of the current limiting module is electrically connected to the second end of the control module.

10. The digital control power output circuit according to claim 1, characterized in that: The circuit further includes a fifth resistor; A first end of the fifth resistor is electrically connected to the digital signal output end, and a second end of the fifth resistor is electrically connected to the output end of the control module.

11. The digital control power output circuit according to claim 10, characterized in that: The circuit also includes a first capacitor; The first electrode of the first capacitor is electrically connected to the control end of the control module, and the second end of the first capacitor is electrically connected to the ground end.

12. The digital control power output circuit according to claim 1, characterized in that: The circuit also includes a second capacitor and a sixth resistor; The first electrode of the second capacitor is electrically connected to the control end of the short-to-ground self-recovery module, and the second electrode of the second capacitor is electrically connected to the ground end; The first end of the sixth resistor is electrically connected to the digital signal output end, and the second end of the sixth resistor is electrically connected to the control end of the short-to-ground self-recovery module.

13. The digital control power output circuit according to claim 1, characterized in that: The circuit further includes a seventh resistor; The seventh resistor is arranged between the second end of the second protection module and the control end of the control module; And / or, the circuit further includes an eighth resistor; The eighth resistor is arranged between the first end of the first protection module and the second power supply.

14. The digital control power output circuit according to claim 1, characterized in that: The circuit further includes a third capacitor; The third capacitor is arranged between the first terminal and the control terminal of the output module.

15. The digital control power output circuit according to claim 1, characterized in that: The circuit further comprises a power output network; the power output network comprises a fourth capacitor and a bidirectional transient voltage suppression diode; The fourth capacitor is arranged between the second end of the output module and the ground end; The bidirectional transient voltage suppression diode is arranged in parallel at both ends of the fourth capacitor.

16. A digitally controlled power output device, characterized in that: The device comprises the digital control power output circuit as described in any one of claims 1-15.

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