Direct-current power supply protection circuit and protection method

Abstract

The invention relates to a direct-current power supply protection circuit and method, and the circuit comprises an input control module which is used for achieving the adjustment of the state of the input control module according to a short-circuit input control signal, a breakdown input control signal and an undervoltage input control signal, and further controlling the connection and disconnection between a power supply and a direct-current power supply module; the output control module is used for realizing self-state adjustment according to the short-circuit output control signal, the breakdown output control signal and the under-voltage output control signal so as to control connection and disconnection between the direct-current power supply module and the load; the short-circuit monitoring module is used for outputting a short-circuit input control signal and a short-circuit output control signal; the chip breakdown monitoring module is used for outputting a breakdown input control signal and a breakdown output control signal; the output undervoltage monitoring module is used for outputting an undervoltage input control signal and an undervoltage output control signal; the safety of the power supply can be protected in time when the power supply fails.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current power supply protection, and in particular to a direct current power supply protection circuit and a protection method. Background Art

[0002] Common DC power modules mainly include LDO power modules and switching power modules. Some power modules do not provide a complete power protection function. For example, a switching power supply in the form of a controller plus an external MOS tube. Even if the power module provides a power protection function, it is provided inside the chip. Once the power chip is damaged by breakdown or internal short circuit occurs, the power module cannot provide power protection function, resulting in damage to the motherboard.

[0003] Currently, the commonly used external short-circuit protection measure is to add a fuse at the input end. Since there is a large impact current when the power is started, a certain margin will be left for the fuse current when the fuse is selected. It takes a long time to trigger the fuse protection. It is very likely that the motherboard has been damaged before the fuse blows. Summary of the invention

[0004] In order to solve the technical problems in the prior art that when a fuse is used to protect a DC power supply, the fuse protection time is long, resulting in damage to load-end devices, etc., the present invention provides a DC power supply protection circuit and a protection method.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A DC power supply protection circuit, comprising:

[0007] An input control module, connected between the power supply and the DC power supply module, for adjusting its own state according to the short-circuit input control signal, the breakdown input control signal and the undervoltage input control signal, thereby controlling the on-off between the power supply and the DC power supply module;

[0008] An output control module, connected between the DC power module and the load, for adjusting its own state according to the short-circuit output control signal, the breakdown output control signal and the undervoltage output control signal, thereby controlling the on-off between the DC power module and the load;

[0009] a short-circuit monitoring module, connected to the DC power module, the input control module and the output control module, and configured to output the short-circuit input control signal and the short-circuit output control signal according to the output voltage of the DC power module;

[0010] A chip breakdown monitoring module, connected to the DC power module, the input control module and the output control module, and configured to output the breakdown input control signal and the breakdown output control signal according to the output voltage of the DC power module;

[0011] The output undervoltage monitoring module is connected to the DC power supply module, the input control module and the output control module, and is used to output the undervoltage input control signal and the undervoltage output control signal according to the output voltage of the DC power supply module.

[0012] The beneficial effects of the present invention are: the short circuit condition of the DC power supply is monitored by the short circuit monitoring module, the breakdown condition of the DC power supply is monitored by the chip breakdown monitoring module, and the output undervoltage monitoring module monitors the output voltage of the DC power supply, and the input control module and the output control module are controlled to be on and off according to the monitoring conditions, so as to control the on and off of the input circuit and the output circuit of the DC power supply. It realizes providing an external power protection function to the DC power supply module without power protection measures, and protecting the mainboard safety when a power failure occurs; it improves the situation that the power supply module with protection function cannot provide protection measures when the chip is damaged, and provides redundant power protection measures when the chip is damaged; it improves the situation that the fuse startup time is long and the startup conditions are difficult to achieve, resulting in the mainboard being damaged before the protection is started, and provides protection measures that start quickly and protect in time.

[0013] Based on the above technical solution, the present invention can also be improved as follows.

[0014] Furthermore, the input control module includes:

[0015] A first AND gate, whose input end is connected to the short-circuit monitoring module, the short-circuit monitoring module and the output undervoltage monitoring module, and is used to perform an AND operation on the short-circuit input control signal, the breakdown input control signal and the undervoltage input control signal to obtain a first AND operation voltage;

[0016] A first MOS transistor, with a gate connected to the output end of the first AND gate, a source connected to the ground, and a drain connected to the power supply via a first resistor, for adjusting its on / off state according to the first AND operation voltage;

[0017] A second MOS tube, having a gate connected to the drain of the first MOS tube, a source connected to the input end of the DC power module, and a drain connected to the power supply, is used to adjust its own on-off state according to the on-off state of the first MOS tube, thereby controlling the on-off between the power supply and the DC power module.

[0018] Further, the output control module includes:

[0019] A second AND gate, whose input end is connected to the short-circuit monitoring module, the short-circuit monitoring module and the output undervoltage monitoring module, is used to perform an AND operation on the short-circuit input control signal, the breakdown input control signal and the undervoltage input control signal to obtain a second AND operation voltage;

[0020] A third MOS tube, having a gate connected to the output end of the second AND gate, a source connected to the ground, and a drain connected to the output end of the DC power supply module via a second resistor in series, and used for adjusting its on / off state according to the second AND operation voltage;

[0021] A fourth MOS tube, having a gate connected to the drain of the third MOS tube, a source connected to the load, and a drain connected to the output end of the DC power supply module, is used to adjust its own on-off state according to the on-off state of the third MOS tube, thereby controlling the on-off between the DC power supply module and the load.

[0022] Further, the short circuit monitoring module includes:

[0023] A short-circuit monitoring output unit, connected to the output end of the DC power module and the control end of the output control module, and used to output a short-circuit output control signal according to the output voltage of the DC power module;

[0024] A short-circuit monitoring input unit is connected to the short-circuit monitoring output unit and the input control module, and is used to output the short-circuit input control signal according to the short-circuit output control signal.

[0025] Further, the short circuit monitoring output unit comprises:

[0026] A first triode, whose base is connected to the output end of the DC power supply module via a third resistor in series, whose emitter is grounded, and whose collector is connected to the power supply via a fourth resistor in series, and is used to adjust its on / off state according to the output voltage of the DC power supply module;

[0027] a fifth MOS transistor, whose gate is connected to the collector of the first triode and whose source is grounded, and which is used to adjust its own on-off state according to the on-off state of the first triode, so as to output the short-circuit output control signal from its own drain;

[0028] a first light-emitting diode, whose anode is connected to the power supply through a fifth resistor in series, and whose cathode is connected to the drain of the fifth MOS tube, and is used to light up the first light-emitting diode when a short circuit occurs in the circuit where the DC power supply module is located;

[0029] The short circuit monitoring input unit comprises:

[0030] a first voltage-dividing circuit, connected to the power supply, and used to divide the output voltage of the power supply to obtain a first divided voltage; wherein the first voltage-dividing circuit comprises a sixth resistor and a seventh resistor, one end of the sixth resistor is connected to the power supply, the other end of the sixth resistor is connected to one end of the seventh resistor, the other end of the seventh resistor is grounded, and the first divided voltage is the voltage across the seventh resistor;

[0031] A first OR gate, one input end of which is connected to one end of the seventh resistor via the first capacitor in series, and the other input end of which is connected to the drain of the fifth MOS tube via the eighth resistor in series, and is used to perform an OR operation on the first divided voltage and the short-circuit output control signal to obtain a first OR operation voltage;

[0032] A ninth resistor, one end of which is connected to the input end of the first OR gate, and the other end of which is connected to the input control module, is used to convert the first OR operation voltage into the short-circuit input control signal.

[0033] Further, when the DC power supply module is a step-down power supply module, the chip breakdown monitoring module includes:

[0034] a second voltage-dividing circuit, connected to the power supply, and used for dividing the output voltage of the power supply to obtain a second divided voltage; wherein the second voltage-dividing circuit comprises a tenth resistor and an eleventh resistor, one end of the tenth resistor is connected to the power supply, the other end of the tenth resistor is connected to one end of the eleventh resistor, the other end of the eleventh resistor is grounded, and the second divided voltage is the voltage across the eleventh resistor;

[0035] a first comparator, wherein a non-inverting input terminal is connected to one end of the eleventh resistor, and an inverting input terminal is connected to the output end of the DC power supply module via a twelfth resistor in series, and is used to compare the output voltage of the DC power supply module with the second divided voltage, and output a first comparison voltage according to the comparison result;

[0036] a second light-emitting diode, the positive electrode of which is connected to the power supply via a thirteenth resistor in series, and the negative electrode of which is connected to the output end of the first comparator, and is used for lighting the second light-emitting diode when a chip breakdown event occurs in the DC power supply module;

[0037] a fourteenth resistor, one end of which is connected to the output end of the first comparator, and the other end of which is connected to the input control module, and is used for converting the first breakdown reference voltage into the breakdown input control signal;

[0038] A fifteenth resistor has one end connected to the output end of the first comparator and the other end connected to the output control module, and is used for converting the first breakdown reference voltage into the breakdown output control signal.

[0039] Further, when the DC power supply module is a boost power supply module, the chip breakdown monitoring module includes:

[0040] a third voltage-dividing circuit, connected to the output end of the DC power supply module, and used for dividing the output voltage of the DC power supply module to obtain a third divided voltage; wherein the third voltage-dividing circuit comprises a sixteenth resistor and a seventeenth resistor, one end of the seventeenth resistor is connected to the power supply, the other end of the seventeenth resistor is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor is grounded, and the third divided voltage is the voltage across the sixteenth resistor;

[0041] A second comparator, whose non-inverting input terminal is connected to one end of the sixteenth resistor, and whose inverting input terminal is connected to the power supply via an eighteenth resistor in series, is used to compare the third divided voltage with the output voltage of the power supply, and output a second comparison voltage according to the comparison result;

[0042] A second OR gate, one input end of which is connected to the power supply via a second capacitor and a nineteenth resistor connected in series in sequence, and the other input end of which is connected to the output end of the second comparator via a twentieth resistor connected in series, and is used to perform an OR operation on the second discharge voltage signal and the voltage signal output by the power supply to obtain a second OR operation voltage;

[0043] a third light-emitting diode, whose anode is connected to the power supply via a twenty-first resistor in series, and whose cathode is connected to the output end of the second OR gate, and is used for lighting the third light-emitting diode when a chip breakdown event occurs in the DC power supply module;

[0044] A twenty-two resistor, one end of which is connected to the output end of the second OR gate and the other end of which is connected to the input control module, is used to convert the second OR operating voltage into the breakdown input control signal; a twenty-three resistor, one end of which is connected to the output end of the second OR gate and the other end of which is connected to the output control module, is used to convert the second OR operating voltage into the breakdown output control signal.

[0045] Furthermore, the undervoltage monitoring module includes:

[0046] a fourth voltage-dividing circuit, connected to the output end of the DC power module, and used to divide the output voltage of the DC power module to obtain a fourth divided voltage; wherein the fourth voltage-dividing circuit includes a twenty-fifth resistor and a twenty-sixth resistor, one end of the twenty-fifth resistor is connected to the output end of the DC power module, the other end of the twenty-fifth resistor is connected to one end of the twenty-sixth resistor, the other end of the twenty-sixth resistor is grounded, and the fourth divided voltage is the voltage across the twenty-sixth resistor;

[0047] a second triode, the base of which is connected to the output end of the DC power supply module via a series connection of a twenty-fourth resistor, and the emitter of which is connected to one end of the twenty-sixth resistor via a series connection of a diode, and is used to adjust its own on-off state according to the output voltage of the DC power supply module, thereby controlling the on-off between the collector and one end of the twenty-sixth resistor; wherein the emitter of the second triode is connected to the cathode of the diode, and one end of the twenty-sixth resistor is connected to the anode of the diode;

[0048] a third triode, the base of which is connected to the collector of the second triode via a series connection of a twenty-seventh resistor, the emitter of which is grounded, and is used to adjust its own on-off state according to the triode driving signal, so as to control the on-off between its own emitter and collector; wherein, when the second triode is in the on state, the triode driving signal is the fourth divided voltage; when the second triode is in the off state, the triode driving signal is the collector voltage of the second triode;

[0049] a fourth light-emitting diode, whose anode is connected to the power supply via a twenty-eighth resistor in series, and whose cathode is connected to the collector of the third transistor, and is configured to light up when an undervoltage event occurs in the DC power supply module;

[0050] a twenty-ninth resistor, one end of which is connected to the collector of the third triode, and the other end of which is connected to the output control module, and is used for converting the collector voltage of the third triode to obtain the undervoltage output control signal;

[0051] A 30th resistor, one end of which is connected to the collector of the third triode and the other end of which is connected to the input control module, is used for converting the collector voltage of the third triode to obtain the undervoltage input control signal.

[0052] In order to solve the above technical problems, the present invention also provides a DC power supply, the specific technical contents of which are as follows:

[0053] A direct current power supply at least comprises the direct current power supply protection circuit mentioned above.

[0054] In order to solve the above technical problems, the present invention also provides a DC power supply protection method, the specific technical contents of which are as follows:

[0055] A DC power supply protection method applied to the above DC power supply protection circuit comprises the following steps:

[0056] Outputting the short-circuit input control signal and the short-circuit output control signal according to the output voltage of the DC power supply module using a short-circuit monitoring module;

[0057] Using a chip breakdown monitoring module to output the breakdown input control signal and the breakdown output control signal according to the output voltage of the DC power supply module;

[0058] Outputting the undervoltage input control signal and the undervoltage output control signal according to the output voltage of the DC power supply module using the output undervoltage monitoring module;

[0059] The input control module is used to adjust its own state according to the short-circuit input control signal, the breakdown input control signal and the undervoltage input control signal, thereby controlling the on-off between the power supply and the DC power supply module;

[0060] The output control module is used to adjust its own state according to the short-circuit output control signal, the breakdown output control signal and the undervoltage output control signal, thereby controlling the on-off between the DC power supply module and the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 1 is a circuit principle block diagram of a DC power supply protection circuit and a protection method according to an embodiment of the present invention;

[0062] Figure 2 is a circuit diagram of an input control module in an embodiment of the present invention;

[0063] Figure 3 A simplified structural diagram of a DC power supply module according to an embodiment of the present invention;

[0064] Figure 4 is a circuit diagram of an output control module in an embodiment of the present invention;

[0065] Figure 5 The circuit of the short circuit monitoring module in the embodiment of the present invention is Figure 1 ;

[0066] Figure 6 The circuit of the short circuit monitoring module in the embodiment of the present invention is Figure 2 ;

[0067] Figure 7 The circuit of the chip breakdown monitoring module in the embodiment of the present invention is Figure 1 ;

[0068] Figure 8 The circuit of the chip breakdown monitoring module in the embodiment of the present invention is Figure 2 ;

[0069] Fig. 9 4 is a circuit diagram of an output undervoltage monitoring module in an embodiment of the present invention. DETAILED DESCRIPTION

[0070] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0071] like Figure 1 As shown, this embodiment provides a DC power supply protection circuit, including:

[0072] An input control module, connected between the power supply and the DC power supply module, for adjusting its own state according to the short-circuit input control signal, the breakdown input control signal and the undervoltage input control signal, thereby controlling the on-off between the power supply and the DC power supply module;

[0073] An output control module, connected between the DC power module and the load, for adjusting its own state according to the short-circuit output control signal, the breakdown output control signal and the undervoltage output control signal, thereby controlling the on-off between the DC power module and the load;

[0074] a short-circuit monitoring module, connected to the DC power module, the input control module and the output control module, and configured to output the short-circuit input control signal and the short-circuit output control signal according to the output voltage of the DC power module;

[0075] A chip breakdown monitoring module, connected to the DC power module, the input control module and the output control module, and configured to output the breakdown input control signal and the breakdown output control signal according to the output voltage of the DC power module;

[0076] an output undervoltage monitoring module, connected to the DC power module, the input control module and the output control module, and configured to output the undervoltage input control signal and the undervoltage output control signal according to the output voltage of the DC power module;

[0077] The fault alarm module is used to output short-circuit fault information according to the short-circuit input control signal and the short-circuit output control signal; output breakdown fault information according to the breakdown input control signal and the breakdown output control signal; and output undervoltage fault information according to the undervoltage input control signal and the undervoltage output control signal. Specifically, the fault alarm module can be an audible and visual alarm module or a display alarm module, which displays short-circuit fault information, breakdown fault information, and undervoltage fault information on a display screen; and emits an alarm sound according to the short-circuit fault information, breakdown fault information, and undervoltage fault information.

[0078] like Figure 2 As shown, the input control module includes:

[0079] A first AND gate U0A, whose input end is connected to the short-circuit monitoring module, the short-circuit monitoring module and the output undervoltage monitoring module, is used to perform an AND operation on the short-circuit input control signal, the breakdown input control signal and the undervoltage input control signal to obtain a first AND operation voltage;

[0080] A first MOS transistor Q1, with a gate connected to the output end of the first AND gate U0A, a source connected to the ground, and a drain connected to the power supply via a first resistor R1, for adjusting its on / off state according to the first AND operation voltage;

[0081] The second MOS transistor Q0 has a gate connected to the drain of the first MOS transistor, a source connected to the input end of the DC power module, and a drain connected to the power supply, and is used to adjust its own on-off state according to the on-off state of the first MOS transistor Q1, thereby controlling the on-off between the power supply and the DC power module.

[0082] The input end of the first AND gate U0A is respectively connected to the output end of the short-circuit monitoring module, the output end of the chip breakdown monitoring module and the output end of the output undervoltage monitoring module, the output end of the first AND gate U0A is connected to the gate of the first MOS transistor Q1, the positive electrode of the power input end of the first AND gate U0A is connected to the power supply, and the negative electrode of the power input end of the first AND gate U0A is grounded; the drain of the first MOS transistor Q1 is respectively connected to one end of the first resistor R1 and the gate of the second MOS transistor Q0, the source of the first MOS transistor Q1 is grounded, the other end of the first resistor R1 is connected to the drain of the second MOS transistor Q0, the drain of the second MOS transistor Q0 is connected to the power supply, and the source of the second MOS transistor Q0 is connected to the input end of the DC power supply module; the first AND gate U0A is used to control the on and off of the first MOS transistor Q1 and the second MOS transistor Q0 according to the short-circuit input control signal, the breakdown input control signal and the undervoltage input control signal, so as to control the on and off between the input end of the DC power supply module and the power supply. VI N0 is a power input terminal for connecting to the input power supply, VI N1 is connected to the input terminal of the power module, and the three control signals of the short-circuit input control signal, the breakdown input control signal and the undervoltage input control signal are respectively input to the three input terminals of the first AND gate U0A. When the power module works normally, the control signal is high level. When the short-circuit input control signal, the breakdown input control signal and the undervoltage input control signal are all high level signals; the first AND gate U0A outputs a high level, so that the N first MOS tube Q1 is turned on, thereby pulling down the G pole of the P second MOS tube Q0, the second MOS tube Q0 is turned on, and the input terminal of the DC power supply is connected to the input power supply. When any control signal is low level, the first MOS tube Q1 is turned off, so that the second MOS tube Q0 is turned off, and the connection between the input terminal of the DC power supply and the input power supply is disconnected. By controlling the on and off of the input control module by the AND gate, the abnormal parameters of multiple DC power supplies can be detected at the same time, and when any abnormality occurs in the DC power supply, the input power supply and the power module are disconnected.

[0083] like Figure 3 As shown, the input end of the DC power module is represented by VI N1, and the output end of the DC power module is represented by VOUT1. M0 represents the label of the DC power module, and the DC power module can be an LDO power supply or a DC switching power supply module or a discrete switching power supply circuit in the form of a controller and a MOS tube.

[0084] like Figure 4 As shown, the output control module includes:

[0085] A second AND gate U1A, whose input end is connected to the short-circuit monitoring module, the short-circuit monitoring module and the output undervoltage monitoring module, is used to perform an AND operation on the short-circuit input control signal, the breakdown input control signal and the undervoltage input control signal to obtain a second AND operation voltage;

[0086] A third MOS transistor Q2, with a gate connected to the output end of the second AND gate U1A, a source grounded, and a drain connected to the output end of the DC power supply module via a second resistor R2 in series, for adjusting its on / off state according to the second AND operation voltage;

[0087] The fourth MOS tube Q3 has a gate connected to the drain of the third MOS tube Q2, a source connected to the load, and a drain connected to the output end of the DC power supply module, and is used to adjust its own on-off state according to the on-off state of the third MOS tube Q2, thereby controlling the on-off between the DC power supply module and the load.

[0088] The input end of the second AND gate U1A is respectively connected to the output end of the short circuit monitoring module, the output end of the chip breakdown monitoring module and the output end of the output undervoltage monitoring module, the output end of the second AND gate U1A is connected to the gate of the third MOS transistor Q2, the positive electrode of the power input end of the second AND gate U1A is connected to the output end of the DC power module, and the negative electrode of the power input end of the second AND gate U1A is grounded; the drain of the third MOS transistor Q2 is respectively connected to one end of the second resistor R2 and the gate of the fourth MOS transistor Q3, the source of the third MOS transistor Q2 is grounded, the other end of the first resistor R1 is connected to the drain of the fourth MOS transistor Q3, the drain of the fourth MOS transistor Q3 is connected to the output end of the DC power module, and the source of the fourth MOS transistor Q3 is connected to the load; the second AND gate U1A is used to control the on and off of the third MOS transistor Q2 and the fourth MOS transistor Q3 according to the short circuit output control signal, the breakdown output control signal and the undervoltage output control signal, so as to control the on and off between the output end of the DC power module and the load. Control the on-off of the output end of the power module to the load end, and the control signal is provided by each monitoring module. VOUT0 is the output end of the power module, and VOUT1 is the load end. The three control signals of short-circuit output control signal, breakdown output control signal and undervoltage output control signal are connected to the input end of the second AND gate U1A. When the power module is working normally, the short-circuit output control signal, breakdown output control signal and undervoltage output control signal are all high level, and the second AND gate U1A outputs a high level, so that the third MOS tube Q2 is turned on, thereby pulling down the G pole of the fourth MOS tube Q3, and the fourth MOS tube Q3 is turned on, and the output end of the power module is connected to the load end as a passage. When any of the three control signals of the short-circuit output control signal, the breakdown output control signal and the undervoltage output control signal is a low level, the third MOS tube Q2 is turned off, so that the fourth MOS tube Q3 is turned off, and the connection from the output end of the power module to the load end is disconnected. By controlling the on-off of the output control module by the AND gate, the abnormal parameters of multiple DC power supplies can be detected at the same time, and when any abnormality occurs in the DC power supply, the DC power supply and the load are disconnected.

[0089] In some embodiments, the short-circuit monitoring module includes: a short-circuit monitoring output unit connected to the output end of the DC power module and the control end of the output control module, and configured to output a short-circuit output control signal according to the output voltage of the DC power module;

[0090] A short-circuit monitoring input unit is connected to the short-circuit monitoring output unit and the input control module, and is used to output the short-circuit input control signal according to the short-circuit output control signal.

[0091] like Figure 5 As shown, the short circuit monitoring output unit includes:

[0092] A first transistor Q4, whose base is connected to the output end of the DC power module via a third resistor R3 in series, whose emitter is grounded, and whose collector is connected to the power supply via a fourth resistor R4 in series, and is used for adjusting its on / off state according to the output voltage of the DC power module;

[0093] a fifth MOS transistor Q5, whose gate is connected to the collector of the first transistor Q4 and whose source is grounded, and which is used to adjust its own on-off state according to the on-off state of the first transistor Q4, so as to output the short-circuit output control signal from its own drain;

[0094] The first light-emitting diode D0 has an anode connected to the power supply through a fifth resistor R5 connected in series, and a cathode connected to the drain of the fifth MOS tube Q5, and is used to light up the first light-emitting diode D0 when a short circuit occurs in the circuit where the DC power supply module is located; when a short circuit event occurs, the drain and source of the fifth MOS tube Q5 are connected, so that the cathode of the first light-emitting diode D0 is grounded, and the power supply supplies power to the first light-emitting diode D0, and the first light-emitting diode D0 is lit to indicate that a short circuit occurs in the circuit where the DC power supply module is located.

[0095] One end of the third resistor R3 is connected to the output end of the DC power module, the other end of the third resistor R3 is connected to the base of the first transistor Q4, the collector of the first transistor Q4 is respectively connected to one end of the fourth resistor R4 and the gate of the fifth MOS transistor Q5; the emitter of the first transistor Q4 and the source of the fifth MOS transistor Q5 are both grounded, the drain of the fifth MOS transistor Q5 is connected to the cathode of the light-emitting diode D0, the anode of the light-emitting diode D0 is connected to one end of the fifth resistor R5, the other end of the fourth resistor R4 and the other end of the fifth resistor R5 are both connected to the power supply, and the drain of the fifth MOS transistor Q5 is connected to the input end of the second AND gate U1A. Monitor whether the line is short-circuited, and send a control signal to the input and output control module and send a light alarm when a fault occurs. When the circuit is in normal working state and in the power-on stage, the power module outputs normally, VOUT0 outputs a high level, the NPN first transistor Q4 is turned on, the N-type fifth MOS tube Q5 is turned off, the short-circuit output control signal is pulled high, the output control module is turned on, and the output end of the power module is connected to the load end.

[0096] There are two types of short circuits. One is that the load end VOUT1 is short-circuited to the ground. At this time, the VOUT0 end is also pulled down to the ground through the fourth MOS tube Q3 diode in the output control module. The second is that the power module is damaged and short-circuited to the ground. At this time, there is no output voltage at the VOUT0 end. Both of the above situations will cause the first transistor Q4 to be cut off, the fifth MOS tube Q5 to be turned on, and the short-circuit output control signal to be pulled down, the output control module is turned off, and the devices at the back end of the power module are protected. The first light-emitting diode D0 lights up to issue a short circuit alarm.

[0097] like Figure 6 As shown, the short circuit monitoring input unit includes:

[0098] a first voltage-dividing circuit, connected to the power supply, and used to divide the output voltage of the power supply to obtain a first divided voltage; wherein the first voltage-dividing circuit comprises a sixth resistor R6 and a seventh resistor R7, one end of the sixth resistor R6 is connected to the power supply, the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is grounded, and the first divided voltage is the voltage across the seventh resistor R7;

[0099] A first OR gate U2A, one input end of which is connected to one end of the seventh resistor R7 via the first capacitor C1 in series, and the other input end of which is connected to the drain of the fifth MOS transistor Q5 via the eighth resistor R8 in series, and is used to perform an OR operation on the first divided voltage and the short-circuit output control signal to obtain a first OR operation voltage;

[0100] A ninth resistor R9 has one end connected to the input end of the first OR gate U2A and the other end connected to the input control module, and is used for converting the first OR operation voltage into the short-circuit input control signal.

[0101] One end of the sixth resistor R6 is connected to a power supply, the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is grounded, one end of the seventh resistor R7 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to a signal input end of the first OR gate U2A; one end of the eighth resistor R8 is connected to the drain of the fifth MOS tube Q5, the other end of the eighth resistor R8 is connected to another signal input end of the first OR gate U2A, the output end of the first OR gate U2A is connected to one end of the ninth resistor R9, and the other end of the ninth resistor R9 is connected to the input end of the first AND gate U0A.

[0102] During the normal operation of the circuit, during the power-on phase, the power supply voltage VI N0 is divided to charge the first capacitor C1. By utilizing the characteristic that the voltage across the capacitor cannot change suddenly, a voltage gradually decreases to 0 volts at the right end of the first capacitor C1. At the same time, the first OR gate U2A briefly outputs a high level, pulls up the short-circuit input control signal, and turns on the input control module. At this time, the power module is operating normally, the short-circuit output control signal is high, maintains the high output of the first OR gate U2A, and continuously turns on the input control module. When a short circuit occurs, the short-circuit output control signal is pulled low, the first OR gate U2A outputs a low level, and turns off the input control module.

[0103] When the DC power supply module is a step-down power supply module, the specific circuit of the chip breakdown monitoring module is as follows: Figure 7 As shown, the chip breakdown monitoring module includes:

[0104] a second voltage-dividing circuit, connected to the power supply, and used for dividing the output voltage of the power supply to obtain a second divided voltage; wherein the second voltage-dividing circuit comprises a tenth resistor R10 and an eleventh resistor R11, one end of the tenth resistor R10 is connected to the power supply, the other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is grounded, and the second divided voltage is the voltage across the eleventh resistor R11;

[0105] A first comparator UA3, having a non-inverting input terminal connected to one end of the eleventh resistor R11, and an inverting input terminal connected to the output end of the DC power supply module via a twelfth resistor R12 in series, for comparing the output voltage of the DC power supply module with the second divided voltage, and outputting a first comparison voltage according to the comparison result;

[0106] The second light-emitting diode D1 has a positive electrode connected to the power supply via a thirteenth resistor R13 in series, and a negative electrode connected to the output end of the first comparator UA3, and is used to light up the second light-emitting diode D1 when a chip breakdown event occurs in the DC power supply module; when a chip breakdown event occurs, the output end of the first comparator UA3 outputs a low level, the output voltage of the power supply supplies power to the second light-emitting diode D1, and the second light-emitting diode D1 lights up to indicate a chip breakdown event.

[0107] A fourteenth resistor R14, one end of which is connected to the output end of the first comparator UA3, and the other end of which is connected to the input control module, and is used for converting the first breakdown reference voltage into the breakdown input control signal;

[0108] A fifteenth resistor R15 has one end connected to the output end of the first comparator UA3 and the other end connected to the output control module, and is used for converting the first breakdown reference voltage into the breakdown output control signal.

[0109] One end of the tenth resistor R10 is connected to the power supply voltage, the other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is grounded, one end of the twelfth resistor R12 is connected to the output end of the DC power supply module, the in-phase input end of the first comparator UA3 is connected to one end of the eleventh resistor R11, the inverting input end of the first comparator UA3 is connected to the other end of the twelfth resistor R12, the output end of the first comparator UA3 is respectively connected to the cathode of the first light-emitting diode D1, the anode of the first light-emitting diode D1 is connected to one end of the thirteenth resistor R13, one end of the fourteenth resistor R14 and one end of the fifteenth resistor R15, the other end of the thirteenth resistor R13 is connected to the power supply voltage, the other end of the fourteenth resistor R14 is connected to the input end of the AND gate U0A, and the other end of the fifteenth resistor R15 is connected to the input end of the second AND gate U1A. The chip breakdown monitoring module is used to monitor whether the chip has breakdown and conduction. When a fault occurs, it sends a control signal to the input and output control modules and issues a light alarm.

[0110] VI N0 voltage divider is connected to the non-inverting input pin of comparator U1A, and VOUT0 is connected to the inverting input pin of comparator U1A. VI N0 voltage divider is set to be higher than VOUT0 voltage. When the power module starts, VI N0 rises before VOUT0, and the output of comparator U3A is high level, pulling up the breakdown input signal and breakdown output control signal, turning on the input and output control modules.

[0111] When the chip is broken down and turned on, VOUT0 is equal to the VI N0 voltage, and the VOUT0 voltage is higher than the VI N0 divided voltage. The output of the comparator U3A is low, which pulls down the breakdown input signal and the breakdown output control signal, turns off the input and output control modules, protects the devices at the back end of the power module, and the first light-emitting diode D1 lights up to issue a chip breakdown alarm.

[0112] When the DC power module is a boost power module, the chip breakdown monitoring module circuit is as follows Figure 8 As shown, the chip breakdown monitoring module includes:

[0113] a third voltage-dividing circuit, connected to the output end of the DC power supply module, and used for dividing the output voltage of the DC power supply module to obtain a third divided voltage; wherein the third voltage-dividing circuit comprises a sixteenth resistor R16 and a seventeenth resistor R17, one end of the seventeenth resistor R17 is connected to the power supply, the other end of the seventeenth resistor R17 is connected to one end of the sixteenth resistor R16, the other end of the sixteenth resistor R16 is grounded, and the third divided voltage is the voltage across the sixteenth resistor R16;

[0114] A second comparator U4A, having a non-inverting input terminal connected to one end of the sixteenth resistor R16, and an inverting input terminal connected to the power supply via an eighteenth resistor R18 in series, for comparing the third divided voltage with the output voltage of the power supply, and outputting a second comparison voltage according to the comparison result;

[0115] A second OR gate U5A, one input end of which is connected to the power supply via a second capacitor C2 and a nineteenth resistor R19 connected in series in sequence, and the other input end of which is connected to the output end of the second comparator U4A via a twentieth resistor R20 connected in series, for performing an OR operation on the second discharge voltage signal and the voltage signal output by the power supply to obtain a second OR operation voltage;

[0116] A third light-emitting diode D2, the positive electrode of which is connected to the power supply through a twenty-first resistor R21 in series, and the negative electrode of which is connected to the output end of the second OR gate U5A, and is used for lighting up the third light-emitting diode D2 when a chip breakdown event occurs in the DC power supply module; when a breakdown event occurs, the output end of the second OR gate U5A outputs a low level, the voltage output by the power supply supplies power to the light-emitting diode D2, and the third light-emitting diode D2 lights up to indicate the occurrence of a breakdown event;

[0117] Twenty-two resistor R22, one end of which is connected to the output end of the second OR gate U5A, and the other end of which is connected to the input control module, is used to convert the second OR operation voltage into the breakdown input control signal; twenty-three resistor R23, one end of which is connected to the output end of the second OR gate U5A, and the other end of which is connected to the output control module, is used to convert the second OR operation voltage into the breakdown output control signal.

[0118] Among them, there are two second capacitors C2; one end of the sixteenth resistor R16 is respectively connected to the seventeenth resistor R17 and the in-phase input end of the second comparator U4A, and the other end of the seventeenth resistor R17 is connected to the output end of the DC power supply module; one end of one of the second capacitors C2 is respectively connected to one end of the eighteenth resistor R18 and the inverting input end of the second comparator U4A, the other end of one of the second capacitors C2 is grounded, and the other end of the eighteenth resistor R18 is connected to the power supply voltage; the output end of the second comparator U4A is connected to one end of the twentieth resistor R20, the other end of the twentieth resistor R20 is connected to an input end of the second OR gate U5A, and the other second capacitor C 2 is connected to the other input terminal of the second OR gate U5A, the other end of the other second capacitor C2 is connected to one end of the nineteenth resistor R19, and the other end of the nineteenth resistor R19 is connected to the power supply voltage; the output end of the second OR gate U5A is respectively connected to the cathode of the second light-emitting diode D2, one end of the twenty-second resistor R22 and one end of the twenty-third resistor R23, the anode of the second light-emitting diode D2 is connected to one end of the twenty-first resistor R21, the other end of the twenty-first resistor R21 is connected to the power supply voltage, the other end of the twenty-second resistor R22 is connected to the input terminal of the first AND gate U0A, and the other end of the twenty-third resistor R23 is connected to the input terminal of the second AND gate U1A.

[0119] The voltage at the VOUT0 terminal is connected to the in-phase input pin of the second comparator U4A after being divided by the seventeenth resistor R17 and the sixteenth resistor R16, and VIN0 is connected to the inverting input pin of the second comparator U4A. When the power module is started, VIN0 charges the second capacitor C2 through the nineteenth resistor R19. By utilizing the characteristic that the voltage across the capacitor cannot change suddenly, a voltage gradually decreases to 0 volts will appear at the right end of the second capacitor C2, and the second OR gate U5A outputs a high level briefly, pulling up the breakdown input control signal and the breakdown output control signal, and turning on the input and output control modules. The power module works and outputs a voltage VOUT0, and the voltage division of VOUT0 is set to be higher than the voltage of VIN0. The second comparator U4A outputs a high level, and the second OR gate U5A outputs a high level to keep the input and output control modules open.

[0120] When the chip is broken down and turned on, VOUT0 is equal to the VI N0 voltage, and the VI N0 voltage is higher than the VOUT0 divided voltage. The second comparator U4A outputs a low level, causing the second OR gate U5A to output a low level, pulling down the breakdown input control signal and the breakdown output control signal, turning off the input and output control modules, and protecting the devices at the back end of the power module. The second light-emitting diode D2 lights up to issue a chip breakdown alarm.

[0121] like Fig. 9As shown, the undervoltage monitoring module includes:

[0122] a fourth voltage-dividing circuit, connected to the output end of the DC power module, and used for dividing the output voltage of the DC power module to obtain a fourth divided voltage; wherein the fourth voltage-dividing circuit comprises a twenty-fifth resistor R25 and a twenty-sixth resistor R26, one end of the twenty-fifth resistor R25 is connected to the output end of the DC power module, the other end of the twenty-fifth resistor R25 is connected to one end of the twenty-sixth resistor R26, the other end of the twenty-sixth resistor R26 is grounded, and the fourth divided voltage is the voltage across the twenty-sixth resistor R26;

[0123] A second triode Q6, the base of which is connected to the output end of the DC power module through a series connection of a twenty-fourth resistor R24, and the emitter of which is connected to one end of the twenty-sixth resistor R26 through a series connection of a diode D3, and is used to adjust its own on-off state according to the output voltage of the DC power module, thereby controlling the on-off between the collector and one end of the twenty-sixth resistor R26; wherein the emitter of the second triode Q6 is connected to the cathode of the diode D3, and one end of the twenty-sixth resistor R26 is connected to the anode of the diode D3;

[0124] A third triode Q7, the base of which is connected to the collector of the second triode Q6 via a series connection of a twenty-seventh resistor R27, and the emitter of which is grounded, and is used to adjust its own on-off state according to the triode driving signal, so as to control the on-off between its own emitter and collector; wherein, when the second triode Q6 is in the on state, the triode driving signal is the fourth divided voltage; when the second triode Q6 is in the off state, the triode driving signal is the collector voltage of the second triode Q6;

[0125] A fourth light-emitting diode D4, whose anode is connected to the power supply via a series connection of a twenty-eighth resistor R28, and whose cathode is connected to the collector of the third transistor Q7, is used for lighting the fourth light-emitting diode D4 when an undervoltage event occurs in the DC power supply module;

[0126] a twenty-ninth resistor R29, one end of which is connected to the collector of the third transistor Q7, and the other end of which is connected to the output control module, and is used for converting the collector voltage of the third transistor Q7 to obtain the undervoltage output control signal;

[0127] The 30th resistor R30 has one end connected to the collector of the third transistor Q7 and the other end connected to the input control module, and is used for converting the collector voltage of the third transistor Q7 to obtain the undervoltage input control signal.

[0128] One end of the twenty-fourth resistor R24 ​​and one end of the twenty-fifth resistor R25 are both connected to the output end of the DC power supply module, the other end of the twenty-fourth resistor R24 ​​is connected to the base of the second transistor Q6, the other end of the twenty-fifth resistor R25 is respectively connected to one end of the twenty-sixth resistor R26 and the anode of the diode D3, the other end of the twenty-sixth resistor R26 is grounded, the cathode of the diode D3 is connected to the emitter of the second transistor Q6, one end of the third capacitor C3 is connected to the emitter of the second transistor Q6, and the other end of the third capacitor C3 is grounded; the collector of the second transistor Q6 is connected to the twenty-seventh resistor R The second resistor R27 is connected to one end of the second resistor R27, the other end of the second resistor R27 is connected to the base of the third transistor Q7, the emitter of the third transistor Q7 is grounded, the collector of the third transistor Q7 is respectively connected to the cathode of the third light-emitting diode D4, one end of the second resistor R29 and one end of the thirtieth resistor R30, the anode of the third light-emitting diode D4 is connected to one end of the second resistor R28, the other end of the second resistor R28 is connected to the power supply voltage, the other end of the thirtieth resistor R30 is connected to the input end of the first AND gate U0A, and the other end of the second resistor R29 is connected to the input end of the second AND gate U1A. The undervoltage monitoring module monitors whether the output of the DC power supply is undervoltage, and sends a control signal to the input and output control module and sends a light alarm when a fault occurs.

[0129] When the circuit is in normal working state and in the power-on stage, VOUT0 is divided by the twenty-fifth resistor R25 and the twenty-sixth resistor R26, and the third capacitor C3 is charged through the diode D3. The B pole of the PNP tube Q6 is connected to VOUT0, and the E pole is connected to the divided voltage of VOUT0, so Q6 is not turned on, so that the NPN transistor Q7 is turned off, and the undervoltage output control signal and the undervoltage input control signal are pulled up, and the input and output control module is turned on. When the VOUT0 voltage drops to the divided voltage at the left end of the diode D3, that is, the positive pole of the diode D3, the fully charged third capacitor C3 is discharged through the second transistor Q6, the twenty-seventh resistor R27 and the third transistor Q7, causing the third transistor Q7 to be turned on. Pull down the undervoltage output control signal and the undervoltage input control signal, and turn off the input and output control module. The third light-emitting diode D4 lights up to issue an output undervoltage warning.

[0130] The embodiment of the present invention monitors the short circuit of the DC power supply through the short circuit monitoring module, monitors the breakdown of the DC power supply through the chip breakdown monitoring module, and monitors the output voltage of the DC power supply through the output undervoltage monitoring module, and controls the on and off of the input control module and the output control module according to the monitoring conditions, so as to control the on and off of the input circuit and the output circuit of the DC power supply. It realizes providing an external power protection function to the DC power supply module without power protection measures, and protects the safety of the mainboard when a power failure occurs; improves the situation that the power supply module with protection function cannot provide protection measures when the chip is damaged, and provides redundant power protection measures when the chip is damaged; improves the situation that the fuse startup time is long and the startup conditions are difficult to achieve, resulting in the mainboard being damaged before the protection is started, and provides protection measures that start quickly and protect in time.

[0131] In some other embodiments, the present invention further provides a DC power supply, including the DC power supply protection circuit, that is, the DC power supply protection circuit in the above embodiment is arranged in the DC power supply, so that the DC power supply has the functions of short circuit protection, chip breakdown protection, undervoltage protection and fault alarm.

[0132] In some other embodiments, the present invention further provides a DC power supply protection method, comprising the following steps:

[0133] Outputting the short-circuit input control signal and the short-circuit output control signal according to the output voltage of the DC power supply module using a short-circuit monitoring module;

[0134] Using a chip breakdown monitoring module to output the breakdown input control signal and the breakdown output control signal according to the output voltage of the DC power supply module;

[0135] Outputting the undervoltage input control signal and the undervoltage output control signal according to the output voltage of the DC power supply module using the output undervoltage monitoring module;

[0136] The input control module is used to adjust its own state according to the short-circuit input control signal, the breakdown input control signal and the undervoltage input control signal, thereby controlling the on-off between the power supply and the DC power supply module;

[0137] The output control module is used to adjust its own state according to the short-circuit output control signal, the breakdown output control signal and the undervoltage output control signal, thereby controlling the on-off between the DC power supply module and the load.

[0138] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A DC power supply protection circuit, characterized in that: Used to protect DC power modules, including: An input control module, connected between the power supply and the DC power supply module, for adjusting its own state according to the short-circuit input control signal, the breakdown input control signal and the undervoltage input control signal, thereby controlling the on-off between the power supply and the DC power supply module; An output control module, connected between the DC power module and the load, for adjusting its own state according to the short-circuit output control signal, the breakdown output control signal and the undervoltage output control signal, thereby controlling the on-off between the DC power module and the load; a short-circuit monitoring module, connected to the DC power module, the input control module and the output control module, and configured to output the short-circuit input control signal and the short-circuit output control signal according to the output voltage of the DC power module; A chip breakdown monitoring module, connected to the DC power module, the input control module and the output control module, and configured to output the breakdown input control signal and the breakdown output control signal according to the output voltage of the DC power module; The output undervoltage monitoring module is connected to the DC power supply module, the input control module and the output control module, and is used to output the undervoltage input control signal and the undervoltage output control signal according to the output voltage of the DC power supply module.

2. The DC power supply protection circuit according to claim 1, characterized in that: The input control module comprises: A first AND gate (U0A), whose input end is connected to the short circuit monitoring module, the short circuit monitoring module and the output undervoltage monitoring module, and is used to perform an AND operation on the short circuit input control signal, the breakdown input control signal and the undervoltage input control signal to obtain a first AND operation voltage; A first MOS transistor (Q1), having a gate connected to the output end of the first AND gate (U0A), a source connected to the ground, and a drain connected to the power supply via a first resistor (R1), and being used to adjust its on / off state according to the first AND operation voltage; A second MOS transistor (Q0) has a gate connected to the drain of the first MOS transistor, a source connected to the input end of the DC power module, and a drain connected to the power supply, and is used to adjust its own on-off state according to the on-off state of the first MOS transistor (Q1), thereby controlling the on-off between the power supply and the DC power module.

3. The DC power supply protection circuit according to claim 2, characterized in that: The output control module comprises: A second AND gate (U1A), whose input end is connected to the short circuit monitoring module, the short circuit monitoring module and the output undervoltage monitoring module, is used to perform an AND operation on the short circuit input control signal, the breakdown input control signal and the undervoltage input control signal to obtain a second AND operation voltage; a third MOS tube (Q2), having a gate connected to the output end of the second AND gate (U1A), a source connected to the ground, and a drain connected to the output end of the DC power supply module via a second resistor (R2) in series, and being used to adjust its on / off state according to the second AND operation voltage; A fourth MOS tube (Q3) has a gate connected to the drain of the third MOS tube (Q2), a source connected to the load, and a drain connected to the output end of the DC power module, and is used to adjust its own on-off state according to the on-off state of the third MOS tube (Q2), thereby controlling the on-off between the DC power module and the load.

4. The DC power supply protection circuit according to claim 3, characterized in that: The short circuit monitoring module comprises: A short-circuit monitoring output unit, connected to the output end of the DC power module and the control end of the output control module, and configured to output a short-circuit output control signal according to the output voltage of the DC power module; A short-circuit monitoring input unit is connected to the short-circuit monitoring output unit and the input control module, and is used to output the short-circuit input control signal according to the short-circuit output control signal.

5. The DC power supply protection circuit according to claim 4, characterized in that: The short circuit monitoring output unit comprises: a first triode (Q4), the base of which is connected to the output end of the DC power supply module via a third resistor (R3) in series, the emitter of which is grounded, and the collector of which is connected to the power supply via a fourth resistor (R4) in series, and is used to adjust its on / off state according to the output voltage of the DC power supply module; a fifth MOS transistor (Q5), having a gate connected to the collector of the first triode (Q4) and a source connected to the ground, and being used for adjusting its own on-off state according to the on-off state of the first triode (Q4) so ​​as to output the short-circuit output control signal from its own drain; a first light-emitting diode (D0), the positive electrode of which is connected to the power supply via a fifth resistor (R5) in series, and the negative electrode of which is connected to the drain of the fifth MOS tube (Q5), and is used to light up the first light-emitting diode (D0) when a short circuit occurs in the circuit where the DC power supply module is located; The short circuit monitoring input unit comprises: a first voltage-dividing circuit, connected to the power supply, and used for dividing the output voltage of the power supply to obtain a first divided voltage; wherein the first voltage-dividing circuit comprises a sixth resistor (R6) and a seventh resistor (R7), one end of the sixth resistor (R6) is connected to the power supply, the other end of the sixth resistor (R6) is connected to one end of the seventh resistor (R7), the other end of the seventh resistor (R7) is grounded, and the first divided voltage is the voltage across the seventh resistor (R7); a first OR gate (U2A), one input end of which is connected to one end of the seventh resistor (R7) via the first capacitor (C1) in series, and the other input end of which is connected to the drain of the fifth MOS transistor (Q5) via the eighth resistor (R8) in series, and is used to perform an OR operation on the first divided voltage and the short-circuit output control signal to obtain a first OR operation voltage; A ninth resistor (R9), one end of which is connected to the input end of the first OR gate (U2A), and the other end of which is connected to the input control module, is used to convert the first OR operation voltage into the short-circuit input control signal.

6. The DC power supply protection circuit according to claim 3, characterized in that: When the DC power supply module is a step-down power supply module, the chip breakdown monitoring module includes: a second voltage-dividing circuit, connected to the power supply, and used for dividing the output voltage of the power supply to obtain a second divided voltage; wherein the second voltage-dividing circuit comprises a tenth resistor (R10) and an eleventh resistor (R11), one end of the tenth resistor (R10) is connected to the power supply, the other end of the tenth resistor (R10) is connected to one end of the eleventh resistor (R11), the other end of the eleventh resistor (R11) is grounded, and the second divided voltage is the voltage across the two ends of the eleventh resistor (R11); a first comparator (UA3), wherein a non-inverting input terminal is connected to one end of the eleventh resistor (R11), and an inverting input terminal is connected to the output end of the DC power supply module via a twelfth resistor (R12) in series, and is used to compare the output voltage of the DC power supply module with the second divided voltage, and output a first comparison voltage according to the comparison result; a second light emitting diode (D1), the positive electrode of which is connected to the power supply via a thirteenth resistor (R13) in series, and the negative electrode of which is connected to the output end of the first comparator (UA3), and is used for lighting the second light emitting diode (D1) when a chip breakdown event occurs in the DC power supply module; a fourteenth resistor (R14), one end of which is connected to the output end of the first comparator (UA3), and the other end of which is connected to the input control module, and is used to convert the first breakdown reference voltage into the breakdown input control signal; A fifteenth resistor (R15) has one end connected to the output end of the first comparator (UA3) and the other end connected to the output control module, and is used for converting the first breakdown reference voltage into the breakdown output control signal.

7. The DC power supply protection circuit according to claim 3, characterized in that: When the DC power supply module is a boost power supply module, the chip breakdown monitoring module includes: a third voltage-dividing circuit, connected to the output end of the DC power supply module, and used for dividing the output voltage of the DC power supply module to obtain a third divided voltage; wherein the third voltage-dividing circuit comprises a sixteenth resistor (R16) and a seventeenth resistor (R17), one end of the seventeenth resistor (R17) is connected to the power supply, the other end of the seventeenth resistor (R17) is connected to one end of the sixteenth resistor (R16), the other end of the sixteenth resistor (R16) is grounded, and the third divided voltage is the voltage across the sixteenth resistor (R16); A second comparator (U4A), having a non-inverting input terminal connected to one end of the sixteenth resistor (R16), and an inverting input terminal connected to the power supply via an eighteenth resistor (R18) in series, for comparing the third divided voltage with the output voltage of the power supply, and outputting a second comparison voltage according to the comparison result; a second OR gate (U5A), one input end of which is connected to the power supply via a second capacitor (C2) and a nineteenth resistor (R19) connected in series in sequence, and the other input end of which is connected to the output end of the second comparator (U4A) via a twentieth resistor (R20) connected in series, and is used to perform an OR operation on the second discharge voltage signal and the voltage signal output by the power supply to obtain a second OR operation voltage; a third light-emitting diode (D2), the positive electrode of which is connected to the power supply via a twenty-first resistor (R21) in series, and the negative electrode of which is connected to the output end of the second OR gate (U5A), and is used for lighting the third light-emitting diode (D2) when a chip breakdown event occurs in the DC power supply module; A twenty-two resistor (R22), one end of which is connected to the output end of the second OR gate (U5A), and the other end of which is connected to the input control module, for converting the second OR operation voltage into the breakdown input control signal; A twenty-three resistor (R23), one end of which is connected to the output end of the second OR gate (U5A), and the other end of which is connected to the output control module, is used to convert the second OR operation voltage into the breakdown output control signal.

8. The DC power supply protection circuit according to claim 3, characterized in that: The undervoltage monitoring module comprises: a fourth voltage-dividing circuit, connected to the output end of the DC power module, and used for dividing the output voltage of the DC power module to obtain a fourth divided voltage; wherein the fourth voltage-dividing circuit comprises a twenty-fifth resistor (R25) and a twenty-sixth resistor (R26), one end of the twenty-fifth resistor (R25) is connected to the output end of the DC power module, the other end of the twenty-fifth resistor (R25) is connected to one end of the twenty-sixth resistor (R26), the other end of the twenty-sixth resistor (R26) is grounded, and the fourth divided voltage is the voltage across the second sixteenth resistor (R26); A second triode (Q6), the base of which is connected to the output end of the DC power supply module via a series connection of a twenty-fourth resistor (R24), and the emitter of which is connected to one end of the twenty-sixth resistor (R26) via a series connection of a diode (D3), and is used to adjust its own on-off state according to the output voltage of the DC power supply module, thereby controlling the on-off state between the collector and one end of the twenty-sixth resistor (R26); wherein the emitter of the second triode (Q6) is connected to the cathode of the diode (D3), and one end of the twenty-sixth resistor (R26) is connected to the anode of the diode (D3); a third triode (Q7), the base of which is connected to the collector of the second triode (Q6) via a series connection of a twenty-seventh resistor (R27), the emitter of which is grounded, and is used to adjust its own on-off state according to a triode driving signal, thereby controlling the on-off between its own emitter and collector; wherein, when the second triode (Q6) is in the on state, the triode driving signal is the fourth divided voltage; and when the second triode (Q6) is in the off state, the triode driving signal is the collector voltage of the second triode (Q6); a fourth light-emitting diode (D4), the positive electrode of which is connected to the power supply via a twenty-eighth resistor (R28) in series, and the negative electrode of which is connected to the collector of the third transistor (Q7), and is used for lighting the fourth light-emitting diode (D4) when an undervoltage event occurs in the DC power supply module; a twenty-ninth resistor (R29), one end of which is connected to the collector of the third triode (Q7), and the other end of which is connected to the output control module, and is used for converting the collector voltage of the third triode (Q7) to obtain the undervoltage output control signal; A thirtieth resistor (R30) has one end connected to the collector of the third transistor (Q7) and the other end connected to the input control module, and is used for converting the collector voltage of the third transistor (Q7) to obtain the undervoltage input control signal.

9. A DC power supply, characterized in that: At least comprises the DC power supply protection circuit as described in any one of claims 1 to 8.

10. A DC power supply protection method applied to the DC power supply protection circuit according to any one of claims 1 to 8, characterized in that: The steps include: Outputting the short-circuit input control signal and the short-circuit output control signal according to the output voltage of the DC power supply module using a short-circuit monitoring module; Using a chip breakdown monitoring module to output the breakdown input control signal and the breakdown output control signal according to the output voltage of the DC power supply module; Outputting the undervoltage input control signal and the undervoltage output control signal according to the output voltage of the DC power supply module using the output undervoltage monitoring module; The input control module is used to adjust its own state according to the short-circuit input control signal, the breakdown input control signal and the undervoltage input control signal, thereby controlling the on-off between the power supply and the DC power supply module; The output control module is used to adjust its own state according to the short-circuit output control signal, the breakdown output control signal and the undervoltage output control signal, thereby controlling the on-off between the DC power supply module and the load.

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