Power supply control circuit and power supply equipment

Abstract

The invention relates to a power supply control circuit and power supply equipment. The power supply control circuit comprises a high-voltage detection turn-off sub-circuit which receives preset first voltage input; when the first voltage is normally input, the output end of the high-voltage detection turn-off sub-circuit outputs a second voltage, so that the boost charging control sub-circuit receives the second voltage and stores electric energy, and meanwhile, the second voltage is output from the output end of the power supply control circuit through the first branch circuit; and when the first voltage generates voltage transient interruption or surge voltage, the output end of the high-voltage detection turn-off sub-circuit is turned off to lower the level of the first input end of the discharge control sub-circuit, so that the discharge control sub-circuit is turned on, the electric energy stored in the boost charge control sub-circuit is output from the output end of the power supply control circuit, and normal power supply is maintained. Finally, the normal voltage output of the power supply control circuit can be maintained and the normal power supply of the circuit can be maintained no matter the power supply input has transient interruption abnormity or surge voltage.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a power supply control circuit and a power supply device. Background Art

[0002] At present, the application of high-reliability electronic devices and electronic power equipment is gradually becoming popular in many fields such as automobiles, industry, avionics, and military. These devices have strict power supply requirements. When the power supply system has a power outage or a short-term surge voltage, it may affect the safety of the equipment. In order to protect electrical equipment, it is necessary to design a system or device to maintain normal power supply to the equipment during a power outage or a short-term surge voltage in the power supply system.

[0003] The existing technology usually uses the characteristics of capacitor energy storage and discharge to solve the problem of power outage. When the power supply system is supplying power normally, the energy storage capacitor is charged. When the power supply system has a power outage, the energy storage capacitor is discharged to maintain normal power supply. However, this method cannot protect electrical equipment when a surge voltage appears in the power supply system, and the existing methods for preventing surge voltage cannot solve the problem of power outage. Therefore, how to balance the power outage and surge voltage of the power supply system, and maintain normal power supply to the equipment during the power outage and short-term surge voltage in the power supply system, is a problem that needs to be solved urgently in this field. Summary of the invention

[0004] The technical problem to be solved by the present invention is how to maintain normal power supply to equipment during a power supply interruption and a short-time surge voltage in the power supply system.

[0005] In order to solve the above technical problems, the first aspect of the present invention provides a power supply control circuit, comprising a high-voltage detection shutdown subcircuit, a first branch, a boost charging control subcircuit and a discharge control subcircuit; wherein the input end of the high-voltage detection shutdown subcircuit serves as the input end of the power supply control circuit; the output end of the boost charging control subcircuit is electrically connected to the second input end of the discharge control subcircuit; the output end of the first branch and the output end of the discharge control subcircuit serve together as the output end of the power supply control circuit;

[0006] The high voltage detection shutdown subcircuit is used to receive a preset first voltage input;

[0007] When the first voltage is input normally, the output terminal of the high voltage detection shutdown subcircuit outputs a second voltage, so that the boost charging control subcircuit receives the second voltage and stores electric energy, and at the same time, the second voltage is output from the output terminal of the power supply control circuit through the first branch;

[0008] When the first voltage generates a voltage interruption or surge voltage, the output end of the high-voltage detection shutdown subcircuit is cut off to lower the level of the first input end of the discharge control subcircuit, thereby turning on the discharge control subcircuit, so that the electric energy stored in the boost charging control subcircuit is output from the output end of the power supply control circuit to maintain normal power supply.

[0009] The above-mentioned power supply control circuit realizes the two abnormal states of power supply interruption and surge voltage of the power supply system through the high-voltage detection shutdown subcircuit. The high-voltage detection shutdown subcircuit detects the surge voltage of the power supply input. When the external input voltage has a surge voltage, the high-voltage detection shutdown subcircuit causes the output end to be cut off due to the voltage change. At this time, the output voltage of the high-voltage detection shutdown subcircuit is interrupted, so that the preset input voltage of the power supply system, whether it is a voltage interruption or a surge voltage, will be converted into a voltage interruption abnormality by the high-voltage detection shutdown subcircuit. When the discharge control subcircuit receives the voltage interruption of the high-voltage detection shutdown subcircuit, the level of the first input end of the discharge control subcircuit is pulled down, and the discharge control subcircuit is turned on, so that the electric energy stored in the boost charging control subcircuit can be output through the discharge control subcircuit, so as to maintain the normal voltage output of the power supply control circuit during the abnormal voltage interruption of the output of the high-voltage detection shutdown subcircuit, and maintain the normal power supply of the circuit, and finally achieve the effect of maintaining the normal voltage output of the power supply control circuit and maintaining the normal power supply of the circuit regardless of the abnormal voltage interruption or surge voltage of the power supply input.

[0010] In one implementation, the high voltage detection shutdown subcircuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first voltage zener diode, a first capacitor, a first voltage comparator and a first N-channel field effect transistor, wherein:

[0011] The first end of the first resistor is electrically connected to the first voltage positive electrode, and the second end is electrically connected to the first end of the third resistor;

[0012] The first end of the second resistor is electrically connected to the first end of the first resistor and serves as the output end of the high voltage detection shutdown sub-circuit, and the second end is electrically connected to the cathode of the first voltage stabilizing diode;

[0013] The second end of the third resistor is electrically connected to the first voltage negative electrode;

[0014] A first end of the fourth resistor is electrically connected to the cathode of the first voltage stabilizing diode, and a second end of the fourth resistor is electrically connected to the first end of the fifth resistor;

[0015] The second end of the fifth resistor is electrically connected to the negative electrode of the first voltage;

[0016] The anode of the first voltage stabilizing diode is electrically connected to the cathode of the first voltage;

[0017] A first end of the first capacitor is electrically connected to the cathode of the first voltage stabilizing diode, and a second end of the first capacitor is electrically connected to the anode of the first voltage stabilizing diode;

[0018] The first voltage comparator has a positive power supply terminal electrically connected to the cathode of the first voltage zener diode, a negative power supply terminal electrically connected to the negative electrode of the first voltage, a positive input terminal electrically connected to the second terminal of the fourth resistor, a negative input terminal electrically connected to the second terminal of the first resistor, and an output terminal electrically connected to the gate of the first N-channel field effect transistor;

[0019] The source of the first N-channel field effect transistor is electrically connected to the first voltage negative electrode, and the drain is electrically connected to the ground terminal.

[0020] Specifically, in the high-voltage detection shutdown subcircuit, the second resistor plays a current limiting role, and the first capacitor plays a filtering role. The path formed by the second resistor, the first voltage zener diode and the first capacitor limits and filters the first voltage and supplies power to the first voltage comparator through the positive power supply terminal. At the same time, the fourth resistor and the fifth resistor divide the voltage of the positive power supply terminal to obtain a reference voltage as the positive input of the first voltage comparator. The first resistor and the third resistor divide the first voltage to obtain a detection voltage as the negative input of the first voltage comparator. When the first voltage is normally supplied, the voltage at the negative input terminal of the first voltage comparator is lower than the voltage at the positive input terminal, and the first voltage comparator outputs a high level, thereby raising the gate level of the first N-channel field effect transistor, and the first N-channel field effect transistor is turned on to turn on the high-voltage detection shutdown subcircuit and output a second voltage, wherein the second voltage is equal to the first voltage. When a surge voltage or overvoltage occurs in the power supply, the first voltage transiently increases, the voltage at the negative input terminal of the first voltage comparator is higher than the voltage at the positive input terminal, and the first voltage comparator outputs a low level, thereby pulling down the gate level of the first N-channel field effect transistor, and the first N-channel field effect transistor is turned off, so that the high-voltage detection shutdown subcircuit is turned off, and the second voltage is interrupted. When the power supply is interrupted, the first voltage is interrupted, and the second voltage is also interrupted.

[0021] In this implementation, a voltage comparator is used to detect whether the power supply has an overvoltage or surge voltage abnormality. When an overvoltage or surge voltage abnormality occurs, the N-channel field effect transistor is turned off to turn off the high-voltage detection shutdown sub-circuit, and the second voltage is interrupted, thereby converting the voltage or surge voltage abnormality of the power supply voltage into a voltage transient abnormality, and then processing the voltage transient abnormality in the subsequent steps to maintain the normal power supply of the power supply control circuit voltage output, so as to achieve the effect of maintaining the normal power supply of the circuit regardless of the transient abnormality or surge voltage of the power supply input.

[0022] In a possible implementation, the boost charging control subcircuit includes a sixth resistor, a second capacitor, a first inductor, a first diode, a seventh resistor, a second N-channel field effect transistor, an eighth resistor, a ninth resistor, a tenth resistor, a third capacitor, a first controller and an energy storage module, wherein:

[0023] The first end of the sixth resistor serves as the input end of the boost charging control subcircuit, and the second end is electrically connected to the first end of the second capacitor;

[0024] The second end of the second capacitor is electrically connected to the ground end;

[0025] The first end of the first inductor is electrically connected to the first end of the sixth resistor, and the second end of the first inductor is electrically connected to the anode of the first diode;

[0026] The cathode of the first diode is electrically connected to the first end of the seventh resistor;

[0027] The second end of the seventh resistor is electrically connected to the input end of the energy storage module;

[0028] The output end of the energy storage module serves as the output end of the boost charging control subcircuit;

[0029] The source of the second N-channel field effect transistor is electrically connected to the first end of the eighth resistor, the gate is electrically connected to the driving end of the first controller, and the drain is electrically connected to the anode of the first diode;

[0030] The second end of the eighth resistor is electrically connected to the ground end;

[0031] The first end of the ninth resistor is electrically connected to the first end of the seventh resistor, and the second end is electrically connected to the first end of the tenth resistor;

[0032] The second end of the tenth resistor is electrically connected to the ground end;

[0033] The first end of the third capacitor is electrically connected to the first end of the seventh resistor, and the second end is electrically connected to the ground end;

[0034] The first controller power supply end is electrically connected to the first end of the second capacitor, the voltage feedback end is electrically connected to the first end of the tenth resistor, the current feedback end is electrically connected to the first end of the eighth resistor, and the GND end is electrically connected to the ground end.

[0035] Specifically, in the boost charging control subcircuit, the sixth resistor plays a current limiting role, the second capacitor plays a filtering role, and the path formed by the sixth resistor and the second capacitor limits and filters the second voltage input to supply power to the first controller. The third capacitor filters the branch where the ninth resistor and the tenth resistor are located, and the ninth resistor and the tenth resistor are located. The branch where the eighth resistor is located provides feedback current for the first controller. The first inductor, the first diode and the seventh resistor form a charging loop to charge the energy storage module. The first controller is a PWM controller, and its output end outputs a PWM signal. At the beginning of each PWM cycle, the first controller driving end first outputs a high-level signal to turn on the second N-channel field effect transistor, thereby generating a gradually increasing current in the charging loop; when the voltage at the voltage feedback end reaches a preset voltage reference threshold value or the current at the current feedback end reaches a preset current reference threshold value in the PWM cycle, the first controller driving end outputs a low level to turn off the second N-channel field effect transistor, thereby causing the charging loop to be freewheeling through the first inductor through the first diode and the seventh resistor to charge the energy storage module.

[0036] In this implementation, the first controller outputs a PMW signal to control the first inductor to perform periodic charging and discharging, thereby charging the energy storage module. The electric energy stored in the energy storage module provides electric energy for maintaining the normal output voltage of the power supply control circuit when the power supply is abnormal.

[0037] In a possible implementation, the energy storage module includes one or more capacitor units, wherein the capacitor unit is composed of one or more capacitor components connected in series or in parallel.

[0038] In this implementation, the characteristic of capacitors that they can store energy in the form of electric fields is utilized to store electrical energy through input voltage, so that when the energy storage module is needed to maintain normal power supply to the power supply control circuit, the capacitors can release the stored electrical energy.

[0039] In a possible implementation, the discharge control subcircuit includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a second voltage zener diode, a fourth capacitor, a first P-channel field effect transistor, a third N-channel field effect transistor and a second voltage comparator, wherein:

[0040] The first end of the eleventh resistor serves as the second input end of the discharge control subcircuit, and the second end is electrically connected to the cathode of the second voltage stabilizing diode;

[0041] The first end of the twelfth resistor is electrically connected to the first end of the eleventh resistor, and the second end is electrically connected to the gate of the first P-channel field effect transistor;

[0042] The first end of the thirteenth resistor serves as the first input end of the discharge control subcircuit, and the second end is electrically connected to the first end of the fourteenth resistor;

[0043] The second end of the fourteenth resistor is electrically connected to the ground end;

[0044] The first end of the fifteenth resistor is electrically connected to the cathode of the second voltage stabilizing diode, and the second end is electrically connected to the first end of the sixteenth resistor;

[0045] The second end of the sixteenth resistor is electrically connected to the ground end;

[0046] A first end of the fourth capacitor is electrically connected to the cathode of the second voltage stabilizing diode, and a second end of the fourth capacitor is electrically connected to the anode of the second voltage stabilizing diode;

[0047] The source of the first P-channel field effect transistor is electrically connected to the first end of the twelfth resistor, and the drain serves as the output end of the discharge control subcircuit;

[0048] The source of the third N-channel field effect transistor is electrically connected to the ground terminal, the gate is electrically connected to the output terminal of the second voltage comparator, and the drain is electrically connected to the gate of the first P-channel field effect transistor;

[0049] The second voltage comparator has a positive power supply terminal electrically connected to the cathode of the second voltage zener diode, a negative power supply terminal electrically connected to the ground terminal, a positive input terminal electrically connected to the first terminal of the sixteenth resistor, and a negative input terminal electrically connected to the first terminal of the fourteenth resistor.

[0050] Specifically, in the discharge control subcircuit, the eleventh resistor plays a current limiting role, and the fourth capacitor plays a filtering role. The path formed by the eleventh resistor, the second voltage stabilizing diode and the fourth capacitor limits and filters the voltage at the second input terminal of the discharge control subcircuit, and then supplies power to the second voltage comparator through the positive power supply terminal. At the same time, the fifteenth resistor and the sixteenth resistor divide the voltage at the positive power supply terminal to obtain a reference voltage as the positive input of the second voltage comparator. The thirteenth resistor and the fourteenth resistor divide the voltage at the first input terminal to obtain a detection voltage as the negative input of the second voltage comparator. When the power supply voltage is normally supplied, the first input terminal normally receives the second voltage. At this time, the voltage at the negative input terminal of the second voltage comparator is higher than the voltage at the positive input terminal, and the second voltage comparator outputs a low level to pull down the gate voltage of the third N-channel field effect transistor, so that the third N-channel field effect transistor is turned off, and then the gate voltage of the first P-channel field effect transistor is set to zero under the pull-up action of the twelfth resistor, and finally the first P-channel field effect transistor is turned off, that is, the discharge control subcircuit is turned off, and the boost charging control subcircuit does not discharge. When the power supply voltage has a momentary interruption abnormality or an overvoltage surge, the second voltage at the first input terminal is interrupted. At this time, the voltage at the negative input terminal of the second voltage comparator is lower than the voltage at the positive input terminal. The second voltage comparator outputs a high level to raise the gate voltage of the third N-channel field effect transistor, so that the third N-channel field effect transistor is turned on, thereby reducing the gate voltage of the first P-channel field effect transistor, and finally turning on the first P-channel field effect transistor, that is, the discharge control subcircuit is turned on, so that the electric energy stored in the boost charging control subcircuit is output from the output terminal of the power supply control circuit to maintain normal power supply.

[0051] In this implementation, a voltage comparator is used to detect whether the second voltage output by the high-voltage detection shutdown subcircuit is interrupted. When the second voltage is momentarily interrupted or interrupted, the N-channel field effect transistor is turned on to turn on the discharge control subcircuit, so that the electric energy stored in the boost charging control subcircuit is output from the output end of the power supply control circuit to maintain normal power supply.

[0052] In a possible implementation, a first switch subcircuit and a second switch subcircuit are respectively provided on the first branch and behind the output end of the discharge control subcircuit, wherein the first switch subcircuit has the same structure as the second switch subcircuit; the input end of the first switch subcircuit serves as the input end of the first branch, and the output end serves as the output end of the first branch; the input end of the second switch subcircuit is electrically connected to the output end of the discharge control subcircuit, and the output end serves as the output end of the power supply control circuit;

[0053] The first switch sub-circuit and the second switch sub-circuit are used to protect the circuit and reduce circuit loss. They are turned on when the input terminal voltage is greater than the output terminal voltage, and are turned off when the input terminal voltage is less than the output terminal voltage.

[0054] In this implementation, the diode function is realized by a switching circuit, which reduces the heat loss of the power supply circuit, prevents the generation of reverse current and voltage spikes, and protects the power supply circuit.

[0055] In a possible implementation, the first switch subcircuit includes a fifth capacitor, a fourth N-channel field effect transistor, and a second controller, wherein:

[0056] The first end of the fifth capacitor serves as the input end of the first switch sub-circuit, and the second end is electrically connected to the ground end;

[0057] The source of the fourth N-channel field effect transistor is electrically connected to the first end of the fifth capacitor, the gate is electrically connected to the driving end of the second controller, and the drain serves as the output end of the first switch sub-circuit;

[0058] The second controller power supply end is electrically connected to the first end of the fifth capacitor, the input collection end is electrically connected to the first end of the fifth capacitor, the output collection end is electrically connected to the drain of the fourth N-channel field effect transistor, and the GND end is electrically connected to the ground end.

[0059] It should also be noted that in the first switch subcircuit, the fifth capacitor has a filtering effect, and the voltage at the input end of the first switch subcircuit is filtered and then supplied to the second controller through the power supply end. The second controller controls the conduction state of the fourth N-channel field effect transistor by comparing the input acquisition end voltage with the output acquisition end voltage, thereby controlling the conduction state of the first switch subcircuit, and realizing the forward conduction and reverse cutoff function of the diode. Specifically, when the input acquisition end voltage is higher than the output acquisition end voltage, the second controller driving end outputs a high level to raise the gate of the fourth N-channel field effect transistor, so that the fourth N-channel field effect transistor is turned on, and the first switch subcircuit is forward-conducted. When the input acquisition end voltage is lower than the output acquisition end voltage, the second controller driving end outputs a low level to pull down the gate of the fourth N-channel field effect transistor, so that the fourth N-channel field effect transistor is turned off, and the first switch subcircuit is reversely cut off.

[0060] In this implementation, the conduction state of the fourth N-channel field effect transistor is controlled by the second controller to achieve the forward conduction and reverse cutoff functions of the first switch sub-circuit. Compared with ordinary diode circuits, the impedance is lower and the circuit loss is smaller.

[0061] In a possible implementation, the power supply control circuit further includes a first filtering subcircuit, wherein:

[0062] The first filter subcircuit input terminal serves as the power supply control circuit input terminal, and the output terminal is electrically connected to the high-voltage detection shutdown subcircuit input terminal, and is used to filter the preset external DC voltage input and then output a first voltage to the high-voltage detection shutdown subcircuit.

[0063] In this implementation, the ripple of the preset DC voltage input is filtered out by a filter circuit, thereby obtaining a DC voltage input with higher quality.

[0064] In a possible implementation, the power supply control circuit further includes a second filtering subcircuit, wherein:

[0065] The second filter subcircuit input end is electrically connected to the first branch output end and the second switch subcircuit output end respectively, and the output end serves as the power supply control circuit output end, and is used to filter the input end voltage and then output it.

[0066] In this implementation, the voltage of the power supply control circuit is filtered by a filter circuit, and the ripple is eliminated before output, so that the output voltage of the power supply control circuit to the power supply device is more stable and of higher quality.

[0067] A second aspect of the present invention provides a power supply device, comprising the power supply control circuit described in any possible implementation manner of the first aspect.

[0068] A power supply control circuit and a power supply device provided by the present invention have at least the following advantages compared with the prior art:

[0069] When a surge voltage appears in the external input voltage, the output end of the high-voltage detection shutdown subcircuit is cut off due to the voltage change. At this time, the output voltage of the high-voltage detection shutdown subcircuit is momentarily interrupted, so that the preset input voltage of the power supply system will be converted into a voltage momentary interruption abnormality by the high-voltage detection shutdown subcircuit regardless of whether it is a voltage momentary interruption or a surge voltage. When the discharge control subcircuit receives the voltage momentary interruption of the high-voltage detection shutdown subcircuit, the level of the first input end of the discharge control subcircuit is pulled down, and the discharge control subcircuit is turned on, so that the electric energy stored in the boost charging control subcircuit can be output through the discharge control subcircuit, so as to maintain the normal voltage output of the power supply control circuit during the abnormal output voltage momentary interruption of the high-voltage detection shutdown subcircuit, and maintain the normal power supply of the circuit, and finally achieve the effect of maintaining the normal voltage output of the power supply control circuit and maintaining the normal power supply of the circuit regardless of whether the power supply input has a momentary interruption abnormality or a surge voltage.

[0070] Specifically, when an overvoltage or surge voltage abnormality occurs, the N-channel field effect transistor in the high-voltage detection shutdown subcircuit is turned off to shut down the high-voltage detection shutdown subcircuit, and the second voltage is interrupted, thereby converting the voltage or surge voltage abnormality of the power supply voltage into a voltage transient abnormality, and then processing the voltage transient abnormality in subsequent steps to maintain normal power supply of the power supply control circuit voltage output, so as to achieve the effect of maintaining normal voltage output of the power supply control circuit and maintaining normal power supply of the circuit regardless of a transient abnormality or surge voltage in the power supply input. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 is a structural schematic diagram of a power supply control circuit provided by an embodiment of the present invention;

[0072] Figure 2 is a circuit diagram of a high voltage detection shutdown sub-circuit provided by an embodiment of the present invention;

[0073] Figure 3 is a circuit diagram of a boost charging control subcircuit provided by an embodiment of the present invention;

[0074] Figure 4 is a circuit diagram of a discharge control subcircuit provided by an embodiment of the present invention;

[0075] Figure 5 is a structural schematic diagram of another power supply control circuit provided by an embodiment of the present invention;

[0076] Figure 6 is a circuit diagram of a first switch circuit provided by an embodiment of the present invention;

[0077] Figure 7 is a circuit diagram of another power supply control circuit provided by an embodiment of the present invention;

[0078] Among them, 110, high-voltage detection shutdown subcircuit; 120, first branch; 130, boost charging control subcircuit; 140, discharge control subcircuit; 200, energy storage module; 210, first switch subcircuit; 220, second switch subcircuit; 230, first filter subcircuit; 240, second filter subcircuit. DETAILED DESCRIPTION

[0079] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0080] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0081] like Figure 1The figure shows a power supply control circuit provided by an embodiment of the present invention, comprising a high-voltage detection shutdown subcircuit 110, a first branch 120, a boost charging control subcircuit 130 and a discharge control subcircuit 140; wherein the input end of the high-voltage detection shutdown subcircuit 110 serves as the input end of the power supply control circuit; the output end of the boost charging control subcircuit 130 is electrically connected to the second input end of the discharge control subcircuit 140; the output end of the first branch 120 and the output end of the discharge control subcircuit 140 serve together as the output end of the power supply control circuit;

[0082] The high voltage detection shutdown subcircuit 110 is used to receive a preset first voltage input;

[0083] When the first voltage is input normally, the output terminal of the high voltage detection shutdown subcircuit 110 outputs a second voltage, so that the boost charging control subcircuit 130 receives the second voltage and stores electric energy, and at the same time, the second voltage is output from the output terminal of the power supply control circuit through the first branch 120;

[0084] When the first voltage generates a voltage interruption or surge voltage, the output end of the high-voltage detection shutdown subcircuit 110 is cut off to lower the level of the first input end of the discharge control subcircuit 140, thereby turning on the discharge control subcircuit 140, so that the electric energy stored in the boost charging control subcircuit 130 is output from the output end of the power supply control circuit to maintain normal power supply.

[0085] like Figure 2 The figure shows a high voltage detection shutdown sub-circuit 110 provided by an embodiment of the present invention, including a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first voltage zener diode D1, a first capacitor C1, a first voltage comparator N1 and a first N-channel field effect transistor S1, wherein:

[0086] The first end of the first resistor R1 is connected to the first voltage positive electrode V a+ The second end is electrically connected to the first end of the third resistor R3;

[0087] The first end of the second resistor R2 is electrically connected to the first end of the first resistor R1 and serves as the output end of the high voltage detection shutdown sub-circuit 110, and the second end is electrically connected to the cathode of the first voltage stabilizing diode D1;

[0088] The second end of the third resistor R3 is connected to the first voltage negative electrode V a－ Electrical connection;

[0089] A first end of the fourth resistor R4 is electrically connected to the cathode of the first voltage stabilizing diode D1, and a second end thereof is electrically connected to the first end of the fifth resistor R5;

[0090] The second end of the fifth resistor R5 is connected to the first voltage negative electrode V a－ Electrical connection;

[0091] The anode of the first voltage stabilizing diode D1 is connected to the first voltage negative electrode V a－ Electrical connection;

[0092] One end of the first capacitor C1 is electrically connected to the cathode of the first voltage zener diode D1, and the second end is electrically connected to the anode of the first voltage zener diode D1;

[0093] The first voltage comparator N1 power supply positive terminal V is electrically connected to the cathode of the first voltage stabilizing diode D1, and the power supply negative terminal G is electrically connected to the first voltage negative electrode V a- The positive input terminal is electrically connected to the second end of the fourth resistor R4, the negative input terminal is electrically connected to the second end of the first resistor R1, and the output terminal O is electrically connected to the gate of the first N-channel field effect transistor S1;

[0094] The source of the first N-channel field effect transistor S1 is connected to the first voltage negative electrode V a－ The drain is electrically connected to the ground terminal GND.

[0095] Specifically, in the high voltage detection shutdown subcircuit 110, the second resistor R2 plays a current limiting role, and the first capacitor C1 plays a filtering role. The second resistor R2, the first voltage zener diode D1 and the first capacitor C1 form a path to convert the first voltage V a After current limiting and filtering, the first voltage comparator N1 is powered by the positive power supply terminal V. At the same time, the fourth resistor R4 and the fifth resistor R5 divide the voltage of the positive power supply terminal V to obtain a reference voltage V ref As the positive input of the first voltage comparator, the first resistor R1 and the third resistor R3 are connected to the first voltage V a Divide the voltage to get the detection voltage V det As the negative input of the first voltage comparator N1. a When the power supply is normal, the negative input voltage of the first voltage comparator N1 is lower than the positive input voltage, and the first voltage comparator N1 outputs a high level, so that the gate level of the first N-channel field effect transistor S1 is raised, and the first N-channel field effect transistor S1 is turned on, so that the high-voltage detection shutdown sub-circuit 110 is turned on, and the second voltage V b , where the second voltage V b Equal to the first voltage V a When a surge voltage or overvoltage occurs in the power supply, the first voltage V aThe voltage at the negative input terminal of the first voltage comparator N1 is higher than the voltage at the positive input terminal, and the first voltage comparator N1 outputs a low level, thereby pulling down the gate level of the first N-channel field effect transistor S1, and the first N-channel field effect transistor S1 is turned off, so that the high-voltage detection shutdown sub-circuit 110 is turned off, and the second voltage V b When the power supply is interrupted, the first voltage V a interruption, so that the second voltage V b An interrupt is also generated.

[0096] like Figure 3 The figure shows a boost charging control subcircuit 130 provided by an embodiment of the present invention, including a sixth resistor R6, a second capacitor C2, a first inductor L1, a first diode D2, a seventh resistor R7, a second N-channel field effect transistor S2, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a third capacitor C3, a first controller U1 and an energy storage module 200, wherein:

[0097] The first end of the sixth resistor R6 is used as the input end of the boost charging control subcircuit 130, and the second end is electrically connected to the first end of the second capacitor C2;

[0098] The second end of the second capacitor C2 is electrically connected to the ground end GND;

[0099] The first end of the first inductor L1 is electrically connected to the first end of the sixth resistor R6, and the second end is electrically connected to the anode of the first diode D2;

[0100] The cathode of the first diode D2 is electrically connected to the first end of the seventh resistor R7;

[0101] The second end of the seventh resistor R7 is electrically connected to the input end of the energy storage module 200;

[0102] The output end of the energy storage module 200 serves as the output end of the boost charging control subcircuit 130;

[0103] The source of the second N-channel field effect transistor S2 is electrically connected to the first end of the eighth resistor R8, the gate is electrically connected to the first controller driving end OUT, and the drain is electrically connected to the anode of the first diode D2;

[0104] The second end of the eighth resistor R8 is electrically connected to the ground terminal GND;

[0105] A first end of the ninth resistor R9 is electrically connected to a first end of the seventh resistor R7, and a second end thereof is electrically connected to a first end of the tenth resistor R10;

[0106] The second end of the tenth resistor R10 is electrically connected to the ground terminal GND;

[0107] A first end of the third capacitor C3 is electrically connected to the first end of the seventh resistor R7, and a second end thereof is electrically connected to the ground terminal GND;

[0108] The first controller power supply terminal V cc The first end of the second capacitor C2 is electrically connected, the voltage feedback end FB is electrically connected to the first end of the tenth resistor R10, the current feedback end CS is electrically connected to the first end of the eighth resistor R8, and the GND end is electrically connected to the ground end GND.

[0109] Specifically, in the boost charging control subcircuit 130, the sixth resistor R6 plays a current limiting role, and the second capacitor C2 plays a filtering role. The path formed by the sixth resistor R6 and the second capacitor C2 converts the second voltage V b The input is current limited and filtered to power the first controller U1. The third capacitor C3 filters the branch where the ninth resistor R9 and the tenth resistor R10 are located, and the branch where the ninth resistor R9 and the tenth resistor R10 are located provides feedback voltage to the first controller U1 after voltage division. The branch where the eighth resistor R8 is located provides feedback current to the first controller U1. The first inductor L1, the first diode D2 and the seventh resistor R7 form a charging circuit to charge the energy storage module 200. The first controller U1 is a PWM controller, and its output end outputs a PWM signal. At the beginning of each PWM cycle, the first controller U1 driving terminal OUT first outputs a high-level signal to turn on the second N-channel field effect transistor S2, thereby generating a gradually increasing current in the charging circuit; when the voltage of the voltage feedback terminal FB reaches a preset voltage reference threshold value or the current of the current feedback terminal CS reaches a preset current reference threshold value in the PWM cycle, the first controller U1 driving terminal OUT outputs a low level to turn off the second N-channel field effect transistor S2, thereby allowing the charging circuit to continue current through the first inductor L1 through the first diode D2 and the seventh resistor R7 to charge the energy storage module 200.

[0110] In this embodiment, the first controller U1 outputs a PMW signal to control the first inductor L1 to perform periodic charging and discharging, thereby charging the energy storage module 200. The electric energy stored in the energy storage module 200 provides an output voltage V to maintain the normal output voltage of the power supply control circuit when the power supply is abnormal. c .

[0111] In some embodiments, the energy storage module includes one or more capacitor units, wherein the capacitor unit is composed of one or more capacitor components connected in series or in parallel.

[0112] It should also be noted that the above embodiment utilizes the characteristic that capacitors can store energy in the form of electric fields and stores electrical energy through input voltage so that when the energy storage module is needed to maintain normal power supply of the power supply control circuit, the capacitor can release the stored electrical energy.

[0113] like Figure 4 The figure shows a discharge control subcircuit 140 provided by an embodiment of the present invention, including an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a second voltage zener diode D3, a fourth capacitor C4, a first P-channel field effect transistor S3, a third N-channel field effect transistor S4 and a second voltage comparator N2, wherein:

[0114] The first end of the eleventh resistor R11 serves as the second input end of the discharge control subcircuit 140, and the second end is electrically connected to the cathode of the second voltage stabilizing diode D3;

[0115] The first end of the twelfth resistor R12 is electrically connected to the first end of the eleventh resistor R11, and the second end is electrically connected to the gate of the first P-channel field effect transistor S3;

[0116] The first end of the thirteenth resistor R13 serves as the first input end of the discharge control subcircuit 140, and the second end is electrically connected to the first end of the fourteenth resistor R14;

[0117] The second end of the fourteenth resistor R14 is electrically connected to the ground terminal GND;

[0118] The first end of the fifteenth resistor R15 is electrically connected to the cathode of the second voltage stabilizing diode D3, and the second end is electrically connected to the first end of the sixteenth resistor R16;

[0119] The second end of the sixteenth resistor R16 is electrically connected to the ground terminal GND;

[0120] A first end of the fourth capacitor C4 is electrically connected to the cathode of the second voltage stabilizing diode D3, and a second end of the fourth capacitor C4 is electrically connected to the anode of the second voltage stabilizing diode D3;

[0121] The source of the first P-channel field effect transistor S3 is electrically connected to the first end of the twelfth resistor R12, and the drain serves as the output end of the discharge control sub-circuit 140;

[0122] The source of the third N-channel field effect transistor S4 is electrically connected to the ground terminal GND, the gate is electrically connected to the output terminal O of the second voltage comparator N2, and the drain is electrically connected to the gate of the first P-channel field effect transistor S3;

[0123] The second voltage comparator N2 has a positive power supply terminal V electrically connected to the cathode of the second voltage zener diode D3, a negative power supply terminal G electrically connected to the ground terminal GND, a positive input terminal electrically connected to the first end of the sixteenth resistor R16, and a negative input terminal electrically connected to the first end of the fourteenth resistor R14.

[0124] Specifically, in the discharge control subcircuit 140, the eleventh resistor R11 plays a current limiting role, and the fourth capacitor C4 plays a filtering role. The path formed by the eleventh resistor R11, the second voltage stabilizing diode D3 and the fourth capacitor C4 converts the voltage V at the second input terminal of the discharge control subcircuit 140 to c After current limiting and filtering, the second voltage comparator N2 is powered by the positive power supply terminal V. At the same time, the fifteenth resistor R15 and the sixteenth resistor R16 divide the positive power supply terminal voltage to obtain a reference voltage V ref The thirteenth resistor R13 and the fourteenth resistor R14 are used as the positive input of the second voltage comparator N2. b Divide the voltage to get the detection voltage V det As the negative input of the second voltage comparator N2. When the power supply voltage is normally supplied, the first input terminal normally receives the second voltage V b At this time, the voltage at the negative input terminal of the second voltage comparator N2 is higher than the voltage at the positive input terminal, and the second voltage comparator N2 outputs a low level to pull down the gate voltage of the third N-channel field effect transistor S4, so that the third N-channel field effect transistor S4 is turned off, and then the gate voltage of the first P-channel field effect transistor S3 is set to zero under the pull-up action of the twelfth resistor R12, and finally the first P-channel field effect transistor S3 is turned off, that is, the discharge control subcircuit 140 is turned off, and the boost charge control subcircuit 130 does not discharge. When the power supply voltage is interrupted abnormally or over-voltage surge occurs, the second voltage V b The second voltage comparator N2 is interrupted. At this time, the voltage at the negative input terminal of the second voltage comparator N2 is lower than the voltage at the positive input terminal. The second voltage comparator N2 outputs a high level to raise the gate voltage of the third N-channel field effect transistor S4, so that the third N-channel field effect transistor S4 is turned on, thereby reducing the gate voltage of the first P-channel field effect transistor S3, and finally turning on the first P-channel field effect transistor S3, that is, the discharge control subcircuit 140 is turned on, so that the electric energy stored in the boost charging control subcircuit 130 is output from the output terminal of the power supply control circuit to maintain normal power supply.

[0125] like Figure 5 The figure shows another power supply control circuit provided by an embodiment of the present invention, including a high-voltage detection shutdown subcircuit 110, a first branch 120, a boost charging control subcircuit 130 and a discharge control subcircuit 140; a first switch subcircuit 210 and a second switch subcircuit 220 are respectively arranged on the first branch 120 and behind the output end of the discharge control subcircuit 140, wherein the first switch subcircuit 210 and the second switch subcircuit 220 have the same structure; the input end of the first switch subcircuit 210 serves as the input end of the first branch 120, and the output end serves as the output end of the first branch 120; the input end of the second switch subcircuit 220 is electrically connected to the output end of the discharge control subcircuit 140, and the output end serves as the output end of the power supply control circuit;

[0126] The first switch subcircuit 210 and the second switch subcircuit 220 are used to protect the circuit and reduce circuit loss. They are turned on when the input voltage is greater than the output voltage, and are turned off when the input voltage is less than the output voltage.

[0127] like Figure 6 FIG. 2 is a first switch sub-circuit 210 provided in an embodiment of the present invention, comprising a fifth capacitor C5, a fourth N-channel field effect transistor S4 and a second controller U2, wherein:

[0128] The first end of the fifth capacitor C5 serves as the input end of the first switch sub-circuit, and the second end is electrically connected to the ground end GND;

[0129] The source of the fourth N-channel field effect transistor S4 is electrically connected to the first end of the fifth capacitor C5, the gate is electrically connected to the driving end GATE of the second controller U2, and the drain serves as the output end of the first switch sub-circuit 210;

[0130] The second controller U2 power supply terminal V cc The first end of the fifth capacitor C5 is electrically connected to the input collection end IN and the first end of the fifth capacitor C5 . The output collection end OUT and the drain of the fourth N-channel field effect transistor S4 are electrically connected to the GND end and the ground end GND.

[0131] Specifically, in the first switch sub-circuit 210, the fifth capacitor C5 plays a filtering role, converting the input voltage V b After filtering, it passes through the power supply terminal V cc The second controller U2 is powered. The second controller U2 controls the conduction state of the fourth N-channel field effect transistor S4 by comparing the voltage of the input collection terminal IN with the voltage of the output collection terminal OUT, thereby controlling the conduction state of the first switch sub-circuit 210, and realizing the function of forward conduction of the diode and reverse cutoff. Specifically, when the voltage of the input collection terminal IN is higher than the voltage of the output collection terminal OUT, the second controller U2 driving terminal GATE outputs a high level to raise the gate of the fourth N-channel field effect transistor S4, so that the fourth N-channel field effect transistor S4 is turned on, and the first switch sub-circuit 210 is forward-conducted. When the voltage of the input collection terminal IN is lower than the voltage of the output collection terminal OUT, the second controller U2 driving terminal GATE outputs a low level to pull down the gate of the fourth N-channel field effect transistor S4, so that the fourth N-channel field effect transistor S4 is turned off, and the first switch sub-circuit 210 is reversely cut off.

[0132] like Figure 7FIG. 1 is another power supply control circuit provided by an embodiment of the present invention, the power supply control circuit includes a high voltage detection shutdown subcircuit 110, a first branch 120, a boost charging control subcircuit 130, a discharge control subcircuit 140, a first switch subcircuit 210, a second switch subcircuit 220, a first filter subcircuit 230 and a second filter subcircuit 240, wherein:

[0133] The input end of the first filtering subcircuit 230 is used as the input end of the power supply control circuit, and the output end is electrically connected to the input end of the high voltage detection shutdown subcircuit 110, and is used to filter the preset external DC voltage input and then output the first voltage V a to the high voltage detection shutdown subcircuit;

[0134] The input end of the second filtering subcircuit 240 is electrically connected to the output end of the first branch 120 and the output end of the second switch subcircuit 220 respectively, and the output end serves as the output end of the power supply control circuit, and is used to filter the input end voltage and then output it.

[0135] An embodiment of the present invention further provides a power supply device, comprising the power supply control circuit described in any one of the possible embodiments above.

[0136] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A power supply control circuit, characterized in that: It includes a high-voltage detection shutdown subcircuit, a first branch, a boost charging control subcircuit and a discharge control subcircuit; wherein the input end of the high-voltage detection shutdown subcircuit serves as the input end of the power supply control circuit; the output end of the boost charging control subcircuit is electrically connected to the second input end of the discharge control subcircuit; the output end of the first branch and the output end of the discharge control subcircuit serve together as the output end of the power supply control circuit; The high voltage detection shutdown subcircuit is used to receive a preset first voltage input; When the first voltage is input normally, the output terminal of the high voltage detection shutdown subcircuit outputs a second voltage, so that the boost charging control subcircuit receives the second voltage and stores electric energy, and at the same time, the second voltage is output from the output terminal of the power supply control circuit through the first branch; When the first voltage generates a voltage interruption or surge voltage, the output end of the high-voltage detection shutdown subcircuit is cut off to lower the level of the first input end of the discharge control subcircuit, thereby turning on the discharge control subcircuit, so that the electric energy stored in the boost charging control subcircuit is output from the output end of the power supply control circuit to maintain normal power supply.

2. A power supply control circuit according to claim 1, characterized in that: The high voltage detection shutdown subcircuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first voltage zener diode, a first capacitor, a first voltage comparator and a first N-channel field effect transistor, wherein: The first end of the first resistor is electrically connected to the first voltage positive electrode, and the second end is electrically connected to the first end of the third resistor; The first end of the second resistor is electrically connected to the first end of the first resistor and serves as the output end of the high voltage detection shutdown sub-circuit, and the second end is electrically connected to the cathode of the first voltage stabilizing diode; The second end of the third resistor is electrically connected to the first voltage negative electrode; A first end of the fourth resistor is electrically connected to the cathode of the first voltage stabilizing diode, and a second end of the fourth resistor is electrically connected to the first end of the fifth resistor; The second end of the fifth resistor is electrically connected to the negative electrode of the first voltage; The anode of the first voltage stabilizing diode is electrically connected to the cathode of the first voltage; A first end of the first capacitor is electrically connected to the cathode of the first voltage stabilizing diode, and a second end of the first capacitor is electrically connected to the anode of the first voltage stabilizing diode; The first voltage comparator has a positive power supply terminal electrically connected to the cathode of the first voltage zener diode, a negative power supply terminal electrically connected to the negative electrode of the first voltage, a positive input terminal electrically connected to the second terminal of the fourth resistor, a negative input terminal electrically connected to the second terminal of the first resistor, and an output terminal electrically connected to the gate of the first N-channel field effect transistor; The source of the first N-channel field effect transistor is electrically connected to the first voltage negative electrode, and the drain is electrically connected to the ground terminal.

3. A power supply control circuit according to claim 1, characterized in that: The boost charging control subcircuit includes a sixth resistor, a second capacitor, a first inductor, a first diode, a seventh resistor, a second N-channel field effect transistor, an eighth resistor, a ninth resistor, a tenth resistor, a third capacitor, a first controller and an energy storage module, wherein: The first end of the sixth resistor serves as the input end of the boost charging control subcircuit, and the second end is electrically connected to the first end of the second capacitor; The second end of the second capacitor is electrically connected to the ground end; The first end of the first inductor is electrically connected to the first end of the sixth resistor, and the second end of the first inductor is electrically connected to the anode of the first diode; The cathode of the first diode is electrically connected to the first end of the seventh resistor; The second end of the seventh resistor is electrically connected to the input end of the energy storage module; The output end of the energy storage module serves as the output end of the boost charging control subcircuit; The source of the second N-channel field effect transistor is electrically connected to the first end of the eighth resistor, the gate is electrically connected to the driving end of the first controller, and the drain is electrically connected to the anode of the first diode; The second end of the eighth resistor is electrically connected to the ground end; The first end of the ninth resistor is electrically connected to the first end of the seventh resistor, and the second end is electrically connected to the first end of the tenth resistor; The second end of the tenth resistor is electrically connected to the ground end; The first end of the third capacitor is electrically connected to the first end of the seventh resistor, and the second end is electrically connected to the ground end; The first controller power supply end is electrically connected to the first end of the second capacitor, the voltage feedback end is electrically connected to the first end of the tenth resistor, the current feedback end is electrically connected to the first end of the eighth resistor, and the GND end is electrically connected to the ground end.

4. A power supply control circuit according to claim 3, characterized in that: The energy storage module includes one or more capacitor units, wherein the capacitor unit is composed of one or more capacitor components connected in series or in parallel.

5. A power supply control circuit according to claim 1, characterized in that: The discharge control subcircuit includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a second voltage zener diode, a fourth capacitor, a first P-channel field effect transistor, a third N-channel field effect transistor and a second voltage comparator, wherein: The first end of the eleventh resistor serves as the second input end of the discharge control subcircuit, and the second end is electrically connected to the cathode of the second voltage stabilizing diode; The first end of the twelfth resistor is electrically connected to the first end of the eleventh resistor, and the second end is electrically connected to the gate of the first P-channel field effect transistor; The first end of the thirteenth resistor serves as the first input end of the discharge control subcircuit, and the second end is electrically connected to the first end of the fourteenth resistor; The second end of the fourteenth resistor is electrically connected to the ground end; The first end of the fifteenth resistor is electrically connected to the cathode of the second voltage stabilizing diode, and the second end is electrically connected to the first end of the sixteenth resistor; The second end of the sixteenth resistor is electrically connected to the ground end; A first end of the fourth capacitor is electrically connected to the cathode of the second voltage stabilizing diode, and a second end of the fourth capacitor is electrically connected to the anode of the second voltage stabilizing diode; The source of the first P-channel field effect transistor is electrically connected to the first end of the twelfth resistor, and the drain serves as the output end of the discharge control subcircuit; The source of the third N-channel field effect transistor is electrically connected to the ground terminal, the gate is electrically connected to the output terminal of the second voltage comparator, and the drain is electrically connected to the gate of the first P-channel field effect transistor; The second voltage comparator has a positive power supply terminal electrically connected to the cathode of the second voltage zener diode, a negative power supply terminal electrically connected to the ground terminal, a positive input terminal electrically connected to the first terminal of the sixteenth resistor, and a negative input terminal electrically connected to the first terminal of the fourteenth resistor.

6. A power supply control circuit according to claim 1, characterized in that: A first switch subcircuit and a second switch subcircuit are respectively arranged on the first branch and behind the output end of the discharge control subcircuit, wherein the first switch subcircuit and the second switch subcircuit have the same structure; the input end of the first switch subcircuit serves as the input end of the first branch, and the output end serves as the output end of the first branch; the input end of the second switch subcircuit is electrically connected to the output end of the discharge control subcircuit, and the output end serves as the output end of the power supply control circuit; The first switch sub-circuit and the second switch sub-circuit are used to protect the circuit and reduce circuit loss. They are turned on when the input terminal voltage is greater than the output terminal voltage, and are turned off when the input terminal voltage is less than the output terminal voltage.

7. A power supply control circuit according to claim 6, characterized in that: The first switch subcircuit includes a fifth capacitor, a fourth N-channel field effect transistor and a second controller, wherein: The first end of the fifth capacitor serves as the input end of the first switch sub-circuit, and the second end is electrically connected to the ground end; The source of the fourth N-channel field effect transistor is electrically connected to the first end of the fifth capacitor, the gate is electrically connected to the driving end of the second controller, and the drain serves as the output end of the first switch sub-circuit; The second controller power supply end is electrically connected to the first end of the fifth capacitor, the input collection end is electrically connected to the first end of the fifth capacitor, the output collection end is electrically connected to the drain of the fourth N-channel field effect transistor, and the GND end is electrically connected to the ground end.

8. A power supply control circuit according to claim 1, characterized in that: Also included is a first filtering subcircuit, wherein: The first filter subcircuit input terminal serves as the power supply control circuit input terminal, and the output terminal is electrically connected to the high-voltage detection shutdown subcircuit input terminal, and is used to filter the preset external DC voltage input and then output a first voltage to the high-voltage detection shutdown subcircuit.

9. A power supply control circuit according to claim 6, characterized in that: Also included is a second filtering subcircuit, wherein: The second filter subcircuit input end is electrically connected to the first branch output end and the second switch subcircuit output end respectively, and the output end serves as the power supply control circuit output end, and is used to filter the input end voltage and then output it.

10. A power supply device, characterized in that: It comprises a power supply control circuit as claimed in any one of claims 1 to 9.

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