Single fire power circuit

Abstract

The present invention relates to the field of intelligent power supply technology, and provides a single-fire power-drawing circuit, including: an open-state single-fire power-drawing module; the open-state single-fire power-drawing module is connected in series with a switch, and is used to draw power from a single-fire line to power external devices when the switch is in a closed state. The open-state single-fire power-drawing module includes: a second rectifier unit, a voltage feedback unit, and a switch control unit; the second rectifier unit, the input end is connected to the first end of the open-state single-fire power-drawing module, and the output end is respectively connected to the input end of the voltage feedback unit and the third end of the open-state single-fire power-drawing module; the output end of the voltage feedback unit is connected to the control end of the switch control unit, and the input end of the switch control unit is connected to the first end of the open-state single-fire power-drawing module; the second rectifier unit, the voltage feedback unit, and the switch control unit are all connected to the reference ground. The above-mentioned single-fire power-drawing module automatically adjusts the output level through the voltage feedback unit and the switch control unit, and has a simple circuit structure, stable output voltage, low power consumption and high efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of intelligent power supply, and in particular relates to a single-fire power supply circuit. Background Art

[0002] With the development of science and technology and the popularization of smart homes, it is essential for consumers to monitor and control indoor environmental parameters. In order not to damage the original decoration and avoid drilling, the existing technology integrates the environmental parameter monitoring and control device and the switch control device into the user's lamp switch, and realizes the intelligent control of the lamp switch, the collection of indoor environmental parameters and the control of indoor environmental parameters (for example, home heating control) without damaging the original decoration. At the same time, a single-fire power supply method is used to power intelligent modules such as the switch control device and the environmental parameter monitoring and control device.

[0003] However, the existing single-fire power supply circuits are often complex in structure and the output voltage is not stable enough. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a single-fire power supply circuit to solve the problem that the single-fire power supply circuit in the prior art has a complex structure and unstable output voltage.

[0005] A first aspect of an embodiment of the present invention provides a single-fire power-taking circuit, characterized by comprising: an open-state single-fire power-taking module;

[0006] The open-state single-fire power-taking module has a first end connected to the first end of the switch, a second end connected to the reference ground, and a third end connected to an external device; the reference ground is connected to the single-fire mains input port; the second end of the switch is connected to the single-fire mains output port; the open-state single-fire power-taking module is used to supply power to the external device when the switch is in a closed state;

[0007] The open-state single-fire power supply module includes: a second rectifier unit, a voltage feedback unit and a switch control unit;

[0008] The second rectifier unit has an input end connected to the first end of the on-state single-fire power supply module, and an output end connected to the input end of the voltage feedback unit and the third end of the on-state single-fire power supply module respectively; the output end of the voltage feedback unit is connected to the control end of the switch control unit, and the input end of the switch control unit is connected to the first end of the on-state single-fire power supply module; the second rectifier unit, the voltage feedback unit and the switch control unit are all connected to the reference ground.

[0009] An embodiment of the present invention provides a single-fire power supply circuit, including: an open-state single-fire power supply module; an open-state single-fire power supply module, used to draw power from a single-fire line to supply power to external devices when the switch is in a closed state. The open-state single-fire power supply module includes: a second rectifier unit, a voltage feedback unit and a switch control unit; the voltage feedback unit controls the switch control unit to adjust the output voltage of the second rectifier unit, so that the output voltage of the open-state single-fire power supply module remains stable. The single-fire power supply circuit provided by the embodiment of the present invention has a simple circuit structure and a stable output voltage, can provide a stable DC voltage for external devices, and has low power consumption and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0011] Figure 1 It is a structural schematic diagram of a single-fire power supply circuit provided by an embodiment of the present invention;

[0012] Figure 2 It is a structural schematic diagram of another single-fire power supply circuit provided by an embodiment of the present invention;

[0013] Figure 3 It is a circuit schematic diagram of an open-state single-fire power-taking module provided in an embodiment of the present invention;

[0014] Figure 4 It is a circuit schematic diagram of an off-state single-fire power-taking module provided in an embodiment of the present invention;

[0015] Figure 5 4 is a circuit diagram of a power storage module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0016] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0017] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below for illustration.

[0018] refer to Figure 1An embodiment of the present invention provides a single-fire power supply circuit, which includes: an open single-fire power supply module 11.

[0019] The open state single-fire power supply module 11 has a first end connected to the first end of the switch 14, a second end connected to the reference ground, and a third end connected to the external device 16; the reference ground is connected to the single-fire mains input port; the second end of the switch 14 is connected to the single-fire mains output port; the open state single-fire power supply module 11 is used to supply power to the external device 16 when the switch 14 is in a closed state;

[0020] The open-state single-fire power supply module 11 includes: a second rectifier unit 111, a voltage feedback unit 112 and a switch control unit 113;

[0021] The second rectifier unit 111 has an input end connected to the first end of the on-state single-fire power-drawing module 11, and an output end connected to the input end of the voltage feedback unit 112 and the third end of the on-state single-fire power-drawing module 11 respectively; the output end of the voltage feedback unit 112 is connected to the control end of the switch control unit 113, and the input end of the switch control unit 113 is connected to the first end of the on-state single-fire power-drawing module 11; the second rectifier unit 111, the voltage feedback unit 112 and the switch control unit 113 are all connected to the reference ground.

[0022] The traditional switch connection relationship is that the live wire is connected to one end of the switch, and the other end of the switch is connected to the load. The switch can control the on and off of the lamp. In some embodiments, the switch can be a mechanical switch or a relay. Figure 4 In the embodiment of the present invention, the single-fire mains power input port JL1 is connected to the mains live wire, and the single-fire mains power output port (JD1 and JD2) is connected to the load (lamp). Depending on the type of switch, there may be one or two single-fire mains power output ports. When the switch 14 is a single-control switch, there is one single-fire mains power output port, one end of the switch 14 is connected to the single-fire mains power output port, and the other end is connected to the first end of the open-state single-fire power supply module 11; when the switch 14 is a double-control switch, there are two single-fire mains power output ports, and the two output ends of the switch 14 are respectively connected to the two single-fire mains power output ports, and the input end of the switch 14 is connected to the first end of the open-state single-fire power supply module 11. The reference ground is a common reference ground terminal in the single-fire power supply circuit. For example, reference ground Figure 4 There are two single-live mains power output ports, JD1 and JD2. The above single-live mains power input port and single-live mains power output port are only the names of the two ports on the mains live line, and do not represent specific input and output, and do not imply the direction of current flow.

[0023] The first end of the on-state single-fire power supply module 11 is connected to the first end of the switch 14. When the switch is in a closed state, the single-fire AC power input port, the on-state single-fire power supply module 11, the switch 14 and the single-fire AC power output port form a path, and the on-state single-fire power supply module 11 draws power.

[0024] The single-fire power-taking circuit provided in the embodiment of the present invention includes an open-state single-fire power-taking module, and the open-state single-fire power-taking module includes: a second rectifier unit, a voltage feedback unit and a switch control unit; the voltage feedback unit controls the switch control unit to adjust the output voltage of the second rectifier unit, so that the output voltage of the open-state single-fire power-taking module remains stable. The single-fire power-taking module provided in the embodiment of the present invention has a simple circuit structure and a stable output voltage, and can provide a stable power supply voltage for external devices, while having low power consumption and high efficiency.

[0025] In some embodiments, reference Figure 3 The second rectifying unit 111 includes: a sixth diode D9, a ninth capacitor E2, a fourth voltage stabilizing diode D7 and a sixteenth resistor R11.

[0026] The anode of the sixth diode D9 is connected to the first end (L) of the switch 14, the cathode of the sixth diode D9 is connected to the first end of the ninth capacitor E2, and the second end of the ninth capacitor E2 is connected to the reference ground. The anode of the fourth voltage zener diode D7 is connected to the reference ground, the cathode of the fourth voltage zener diode D7 is connected to the cathode of the sixth diode D9, the sixteenth resistor R11 is connected in parallel to both ends of the ninth capacitor E2, and the cathode of the sixth diode D9 is connected to the output end of the second rectifier unit 111.

[0027] In some embodiments, reference Figure 3 The voltage feedback unit 112 includes: a voltage comparison element U5, a first voltage regulator diode D11, a first resistor R17, a second resistor R13, a third resistor R18, a fourth resistor R16 and a fifth resistor R20.

[0028] The voltage comparison element U5 has a voltage reference end connected to the input end of the voltage feedback unit 112, an output end connected to the output end of the voltage feedback unit 112 through a first resistor R17, a positive input end connected to the reference ground through a third resistor R18, a positive input end also connected to the input end of the voltage feedback unit 112 through a fourth resistor R16, a negative input end connected to the input end of the voltage feedback unit 112 through a fifth resistor R20, and a negative input end of the voltage comparison element U5 is also connected to the cathode of the first voltage zener diode D11.

[0029] The second resistor R13 is connected in parallel between the output terminal of the voltage comparison element U5 and the positive input terminal of the voltage comparison element U5; the anode of the first voltage stabilizing diode D11 is connected to the reference ground.

[0030] The first voltage stabilizing diode D11 stabilizes the voltage at the negative input terminal of the voltage comparison element U5 at a suitable level as a reference voltage. The positive input terminal of the voltage comparison element U5 is connected to the output terminal of the second rectifier unit 111 through the fourth resistor R16. When the output voltage of the second rectifier unit 111 increases, the voltage at the positive input terminal of the voltage comparison element U5 increases accordingly. When the voltage at the positive input terminal of the voltage comparison element U5 is higher than the voltage at the negative input terminal of the voltage comparison element U5, the output terminal of the voltage comparison element U5 outputs a high level. Conversely, when the output voltage of the second rectifier unit 111 decreases, the voltage at the positive input terminal of the voltage comparison element U5 decreases accordingly. When the voltage at the positive input terminal of the voltage comparison element U5 is lower than the voltage at the negative input terminal of the voltage comparison element U5, the output terminal of the voltage comparison element U5 outputs a low level.

[0031] In some embodiments, the voltage comparison element U5 may be a comparator.

[0032] In some embodiments, reference Figure 3 The switch control unit 113 includes: a sixth resistor R19, a first switch tube Q2 and a freewheeling diode D10.

[0033] The control end of the first switch tube Q2 is connected to the input end of the switch control unit 113, the first end of the first switch tube Q2 is connected to the first end (L) of the switch 14, and the second end of the first switch tube Q2 is connected to the reference ground. The control end of the first switch tube Q2 is also connected to the reference ground through the sixth resistor R19. The positive electrode of the freewheeling diode D10 is connected to the reference ground, and the negative electrode of the freewheeling diode D10 is connected to the input end of the switch control unit 113.

[0034] The control end of the first switch tube Q2 is connected to the output end of the voltage feedback unit 112. When the output end of the voltage feedback unit 112 outputs a high level, the first switch tube Q2 is turned on, and the power supply of the second rectifier unit 111 stops. When the output end of the voltage feedback unit 112 outputs a low level, the first switch tube Q2 is turned off, and the second rectifier unit 111 is powered normally. The voltage feedback unit 112 detects the output voltage of the second rectifier unit 111, and controls the opening and closing of the switch tube of the switch control unit 113 according to the detection result, thereby adjusting the output voltage of the second rectifier unit 111, so that the second rectifier unit 111 outputs a stable voltage with low power consumption and high efficiency.

[0035] In some embodiments, the first switch transistor Q2 may be an enhancement type NMOS transistor.

[0036] In some embodiments, reference Figure 2 , the single-fire power-taking circuit may further include: an off-state single-fire power-taking module 12;

[0037] The off-state single-fire power supply module 12 has a first end connected to the second end of the switch 14 , a second end connected to the reference ground, and a third end connected to the external device 16 .

[0038] The OFF-state single-fire power-drawing module 12 is used to draw power when the switch is in the OFF state, and the ON-state single-fire power-drawing module 11 is used to draw power when the switch is in the CLOSED state. The single-fire power-drawing circuit provided in the embodiment of the present invention can complete power drawing when the switch 14 is in the OFF state or the CLOSED state. When the switch is in the CLOSED state, the single-fire city power input port, the ON-state single-fire power-drawing module 11, the switch 14 and the single-fire city power output port form a path, and the ON-state single-fire power-drawing module 11 draws power. Since the voltage is almost entirely applied to the load after the switch 14 is closed, the OFF-state single-fire power-drawing module 12 has no voltage and cannot draw power. When the switch 14 is in the OFF state, there is still a tiny current flowing through. Using this tiny current, the OFF-state single-fire power-drawing module 12 is designed to draw power when the switch is in the OFF state. When the switch is in the OFF state, the circuit of the ON-state single-fire power-drawing module 11 is disconnected and cannot draw power.

[0039] In some embodiments, the off-state single-fire power supply module 12 includes: a first rectifier unit 121 and a voltage reduction unit 122 .

[0040] The input end of the first rectifier unit 121 is connected to the first end of the off-state single-fire power-taking module 12, the output end of the first rectifier unit 121 is connected to the input end of the step-down unit 122, and the output end of the step-down unit 122 is connected to the third end of the off-state single-fire power-taking module 12. The first rectifier unit 121 and the step-down unit 122 are both connected to the reference ground.

[0041] The first rectifier unit 121 is used to convert AC mains power into DC power. The step-down unit 122 steps down the DC power rectified by the first rectifier unit 121 to obtain DC power of suitable voltage, thereby providing a stable DC voltage for external devices with low power consumption and high efficiency.

[0042] In some embodiments, reference Figure 4 The first rectifying unit 121 includes: a third diode D1, a fourteenth resistor R1, a TVS (transient voltage suppression diode) diode TVS1 and a seventh capacitor E1.

[0043] The anode of the third diode D1 is connected to the second end of the switch 14, the cathode of the third diode D1 is connected to the first end of the fourteenth resistor R1, the second end of the fourteenth resistor R1 is connected to the first end of the seventh capacitor E1, and the second end of the seventh capacitor E1 is connected to the reference ground. The cathode of the TVS diode TVS1 is connected to the first end of the seventh capacitor E1, the anode of the TVS diode TVS1 is connected to the reference ground, and the cathode of the TVS diode TVS1 is connected to the input end of the step-down unit 122 as the output end of the first rectifier unit 121.

[0044] The TVS diode TVS1 is used to suppress the peak voltage of the AC power and perform voltage clamping. The third diode D1 is unidirectionally conducted to convert the AC power into the DC power. The seventh capacitor E1 is used for filtering. The above component combination converts the AC power into the DC power and provides a stable DC voltage for the external equipment.

[0045] In some embodiments, when the switch 14 is a dual-control switch, that is, when there are two single-phase AC power output ports, each single-phase AC power output interface is provided with a diode for converting AC power into DC power, and the positive electrode of each diode is respectively connected to the corresponding single-phase AC power output port, and the negative electrode of each diode is connected to the first end of the fourteenth resistor R1. Figure 4 When there are two single-phase AC power output interfaces, the first rectifier unit 121 may also include a fourth diode D2, the anode of the fourth diode D2 is connected to the first single-phase AC power output port JD1, the anode of the third diode D1 is connected to the second single-phase AC power output port JD2, and the cathode of the third diode D1 is connected to the cathode of the fourth diode D2 and then connected to the first end of the fourteenth resistor R1.

[0046] In some embodiments, reference Figure 4 The voltage reduction unit 122 includes: a voltage reduction element PM1, a fifteenth resistor R2, an eighth capacitor E3, a third voltage regulator diode DZ1 and a fifth diode D4.

[0047] The input end (pin 1) of the step-down unit 122 is connected to the output end of the first rectifier unit 121, the first end of the fifteenth resistor R2 is connected to the first adjustment end (pin 2) of the step-down element PM1, and the second end of the fifteenth resistor R2 is connected to the second adjustment end (pin 3) of the step-down element PM1; the first end of the eighth capacitor E3 is connected to the output end (pin 4) of the step-down element PM1, the second end of the eighth capacitor E3 is connected to the reference ground, the positive terminal of the third zener diode DZ1 is connected to the reference ground, the negative terminal of the third zener diode DZ1 is connected to the first end of the eighth capacitor E3, the first end of the eighth capacitor E3 is also connected to the positive electrode of the fifth diode D4, and the negative electrode of the fifth diode D4 is connected to the power storage module 13 as the output end of the step-down unit 122.

[0048] The fifteenth resistor R2 is connected in parallel between pins 2 and 3 of the voltage-dropping element PM1 to adjust the output voltage of the voltage-dropping element PM1. The eighth capacitor E3 and the third voltage-stabilizing diode DZ1 are connected in parallel to enable the voltage-dropping element PM1 to output a stable DC voltage.

[0049] In some embodiments, the single-fire power supply circuit may further include: a power storage module 13 .

[0050] The input end of the power storage module 13 is connected to the third end of the on-state single-fire power extraction module 11 and the third end of the off-state single-fire power extraction module 12 respectively, and the output end of the power storage module 13 is connected to the external device 16 .

[0051] The electric energy obtained by the on-state single-fire power-drawing module 11 and the off-state single-fire power-drawing module 12 is stored in the power storage module 13. When the on-state single-fire power-drawing module 11 or the off-state single-fire power-drawing module 12 cannot meet the power supply demand, the electric energy stored in the power storage module 13 is released to supply power to external devices. When the switch is closed, the on-state single-fire power-drawing module 11 and the power storage module 13 jointly supply power, increasing the stability and reliability of the power supply.

[0052] In some embodiments, the power storage module 13 includes: a current limiting unit 131 , a charging control unit 132 , and a charging balancing unit 133 .

[0053] The first input end of the current limiting unit 131 is connected to the third end of the on-state single-fire power supply module 11, the second input end of the current limiting unit 131 is connected to the third end of the off-state single-fire power supply module 12, the output end of the current limiting unit 131 is connected to the input end of the charging control unit 132, and the output end of the charging control unit 132 is connected to the charging balancing unit 133; the charging balancing unit 133 includes a farad capacitor, the farad capacitor includes a first farad capacitor C7 and a second farad capacitor C8, and the charging balancing unit 133 is used to balance the voltage of the first farad capacitor C7 and the voltage of the second farad capacitor C8.

[0054] The current limiting unit 131 is used to limit the charging current to prevent the light from flashing due to excessive current when the light is in the off state. The charging control unit 132 is used to detect the output voltage of the current limiting unit 131, and when the output voltage of the current limiting unit 131 is too low, the charging of the farad capacitor is stopped.

[0055] In some embodiments, reference Figure 5 The current limiting unit 131 includes: a current limiting and voltage stabilizing element U1, a first diode D5, a seventh resistor R7, an eighth resistor R3 and a first capacitor C2.

[0056] The positive electrode of the first diode D5 is connected to the first input end of the current limiting unit 131, and the negative electrode of the first diode D5 is connected to the negative end of the current limiting and voltage stabilizing element U1 through the seventh resistor R7; the positive input end (pin 1) of the current limiting and voltage stabilizing element U1 is respectively connected to the enable end (pin 3) of the current limiting and voltage stabilizing element U1, the second input end of the current limiting unit 131 and the first end of the first capacitor C2, and the second end of the first capacitor C2 is connected to the reference ground; the output end (pin 5) of the current limiting and voltage stabilizing element U1 is respectively connected to the feedback end (pin 4) of the current limiting and voltage stabilizing element U1 and the first end of the eighth resistor R3, and the second end of the eighth resistor R3 is respectively connected to the negative end (pin 2) of the current limiting and voltage stabilizing element U1 and the output end of the current limiting unit 131.

[0057] In some embodiments, the current limiting and voltage stabilizing element U1 is a small current voltage stabilizing element, which is used to limit the charging current to prevent flashing, and at the same time, the output voltage of the third terminal of the off-state single-fire power-taking module 12 is secondary reduced, so that the output voltage of the current limiting unit 131 is stabilized at a suitable voltage value when the power is taken in the off state. There is no need to limit the charging current when the power is taken in the on-state single-fire, and in order to quickly charge the farad capacitor, the third terminal of the on-state single-fire power-taking module 11 is directly connected to the second terminal of R3 through the first diode D5 and the seventh resistor R7, and the second terminal of R3 is the output terminal of the current limiting unit 131.

[0058] In some embodiments, reference Figure 5 The charging control unit 132 includes: a second capacitor C1, a third capacitor C6, a fourth capacitor C4, a fifth capacitor C3, a sixth capacitor C5, a ninth resistor R10, a tenth resistor R4, an eleventh resistor R8, a second voltage stabilizing diode DZ2, a second diode D12, a first voltage detection element U8 and a switching voltage stabilizing element U2.

[0059] The first end of the second capacitor C1 is connected to the cathode of the second voltage stabilizing diode DZ2 and the input end of the charging control unit 132, respectively, and the second end of the second capacitor C1 is connected to the reference ground; the anode of the second voltage stabilizing diode DZ2 is connected to the input end (pin 3) of the first voltage detection element U8 and the input end (pin 1) of the switching voltage stabilizing element U2, respectively, the ground end (pin 2) of the first voltage detection element U8 is connected to the reference ground, the output end (pin 1) of the first voltage detection element U8 is connected to the enable end (pin 3) of the switching voltage stabilizing element U2 through the ninth resistor R10, the first end of the third capacitor C6 is connected to the anode of the second voltage stabilizing diode DZ2, and the second end of the third capacitor C6 is connected to the reference ground; the fifth capacitor C3 is connected in parallel to the input end (pin 1) of the switching voltage stabilizing element U2 The first end of the fourth capacitor C4 is connected to the enable end (pin 3) of the switching voltage stabilizing element U2, and the second end of the fourth capacitor C4 is connected to the reference ground; the tenth resistor R4 is connected in parallel between the output end (pin 5) of the switching voltage stabilizing element U2 and the feedback end (pin 4) of the switching voltage stabilizing element U2, and the feedback end (pin 4) of the switching voltage stabilizing element U2 is connected to the reference ground through the eleventh resistor R8; the first end of the sixth capacitor C5 is connected to the output end (pin 5) of the switching voltage stabilizing element U2, and the second end of the sixth capacitor C5 is connected to the reference ground; the output end (pin 5) of the switching voltage stabilizing element U2 is connected to the anode of the second diode D12, and the cathode of the second diode D12 is connected to the output end of the charging control unit 132.

[0060] The charging control unit 132 is used to control the charging of the farad capacitor. The second voltage stabilizing diode DZ2 is used to step down the output voltage of the current limiting unit 131. The voltage after the voltage reduction by the second voltage stabilizing diode DZ2 is input to the input end of the first voltage detection element U8 for detection. When the voltage value after the voltage reduction by the second voltage stabilizing diode DZ2 reaches the first preset voltage value, the first voltage detection element U8 outputs a high level, and the switching voltage stabilizing element U2 is turned on to charge the farad capacitor. When the voltage value after the voltage reduction by the second voltage stabilizing diode DZ2 is less than the first preset voltage value, the first voltage detection element U8 outputs a low level, and the switching voltage stabilizing element U2 is turned off to stop charging the farad capacitor. The second diode D12 is unidirectionally conducted to prevent the reverse charging of the electric energy of the farad capacitor.

[0061] In some embodiments, reference Figure 5 The charging balancing unit 133 may include: a second voltage detection element U3, a third voltage detection element U4, a second switch tube Q4, a third switch tube Q5, a twelfth resistor R6 and a thirteenth resistor R9.

[0062] The output end of the charging control unit 132 is connected to the input end (pin 3) of the second voltage detection element U3, the output end (pin 1) of the second voltage detection element U3 is connected to the control end of the second switch tube Q4, the input end (pin 3) of the second voltage detection element U3 is connected to the first end of the second switch tube Q4 through the twelfth resistor R6, and the second end of the second switch tube Q4 is connected to the ground end (pin 2) of the second voltage detection element U3; the first farad capacitor C7 is connected in parallel between the input end (pin 3) of the second voltage detection element U3 and the ground end (pin 2) of the second voltage detection element U3.

[0063] The input end (pin 3) of the third voltage detection element U4 is connected to the ground end (pin 2) of the second voltage detection element U3, the output end (pin 1) of the third voltage detection element U4 is connected to the control end of the third switch tube Q5, the input end (pin 3) of the third voltage detection element U4 is connected to the first end of the third switch tube Q5 through the thirteenth resistor R9, and the second end of the third switch tube Q5 is connected to the ground end (pin 2) of the third voltage detection element U4; the second farad capacitor C8 is connected in parallel between the input end (pin 3) of the third voltage detection element U4 and the ground end (pin 2) of the third voltage detection element U4, and the ground end (pin 2) of the third voltage detection element U4 is connected to the reference ground.

[0064] The ground terminal (pin 2) of the second voltage detection element U3 is connected to the input terminal of the third voltage detection element U4 (pin 3), and the ground terminal (pin 2) of the third voltage detection element U4 is connected to the reference ground. The second voltage detection element U3 detects the voltage difference across the first farad capacitor C7, and the third voltage detection element U4 detects the voltage across the second farad capacitor C8. When the voltage across the first farad capacitor C7 reaches the second preset voltage value, the second voltage detection element U3 outputs a high level, and the second switch tube Q4 is turned on; when the voltage across the second farad capacitor C8 reaches the second preset voltage value, the third voltage detection element U4 outputs a high level, and the third switch tube Q5 is turned on; since the output voltage of the charging control unit 132 is set to be less than twice the second preset voltage value, the voltage across the first farad capacitor C7 and the voltage across the second farad capacitor C8 will not reach the second preset voltage value at the same time, that is, the second switch tube Q4 and the third switch tube Q5 will not be turned on at the same time;

[0065] When the voltage across the first farad capacitor C7 and the voltage across the second farad capacitor C8 are both small, the second switch tube Q4 and the third switch tube Q5 are both turned off, and the charging control unit 132 charges the first farad capacitor C7 and the second farad capacitor C8 at the same time; when the voltage across the first farad capacitor C7 reaches the second preset voltage value, the voltage across the second farad capacitor C8 is less than the second preset voltage value, the voltage across the first farad capacitor C7 and the voltage across the second farad capacitor C8 are unbalanced, the second switch tube Q4 is turned on, the third switch tube Q5 is turned off, and the charging control unit 132 charges the first farad capacitor C7 and the second farad capacitor C8 through the tenth The second resistor R6 and the second switch tube Q4 charge the second farad capacitor C8, so that the voltage across the first farad capacitor C7 and the voltage across the second farad capacitor C8 tend to be balanced; when the voltage across the second farad capacitor C8 reaches the second preset voltage value, the voltage across the first farad capacitor C7 is less than the second preset voltage value, the third switch tube Q5 is turned on, and the second switch tube Q4 is turned off, and the charging control unit 132 charges the first farad capacitor C7 through the thirteenth resistor R9 and the third switch tube Q5, so that the voltage across the first farad capacitor C7 and the voltage across the second farad capacitor C8 tend to be balanced.

[0066] In the above embodiment, the power storage module 13 includes two farad capacitors, namely a first farad capacitor C7 and a second farad capacitor C8. In some embodiments, the number of farad capacitors in the power storage module 13 may also be one or more than three. The charging balance unit 133 includes one or more charging balance sub-units, each charging balance sub-unit includes a farad capacitor, and the number of charging balance sub-units is consistent with the number of farad capacitors. Multiple charging balance sub-units are connected in series, wherein the input end of the first charging balance sub-unit is connected to the output end of the charging control unit 132, and the output end of the last charging balance sub-unit is connected to the reference ground. For example, the charging balance sub-unit includes: a first farad capacitor C7, a second voltage detection element U3, a second switch tube Q4 and a twelfth resistor R6. The input end (pin 3) of the second voltage detection element U3 is connected to the input end of the charging balance subunit, the output end (pin 1) of the second voltage detection element U3 is connected to the control end of the second switch tube Q4, the input end (pin 3) of the second voltage detection element U3 is connected to the first end of the second switch tube Q4 through the twelfth resistor R6, and the second end of the second switch tube Q4 is connected to the ground end (pin 2) of the second voltage detection element U3; the first farad capacitor C7 is connected in parallel between the input end (pin 3) of the second voltage detection element U3 and the ground end (pin 2) of the second voltage detection element U3, and the ground end (pin 2) of the second voltage detection element U3 is connected to the output end of the charging balance subunit.

[0067] When the number of the charging balancing subunits is 1, the input end of the charging balancing subunit is connected to the output end of the charging control unit 132, and the output end of the charging balancing subunit is connected to the reference ground; when the number of the charging balancing subunits is 2, the input end of the first charging balancing subunit is connected to the output end of the charging control unit 132, the output end of the first balancing subunit is connected to the input end of the second charging balancing subunit, and the output end of the second charging balancing subunit is connected to the reference ground; when the number of the charging balancing subunits is more than 3, multiple charging balancing subunits are connected in series, and the input end of the first charging balancing subunit is connected to the output end of the charging control unit 132, and the output end of the last charging balancing subunit is connected to the reference ground.

[0068] In some embodiments, reference Figure 4 The above-mentioned single-fire power supply circuit may further include: a protection module 15; the protection module 15 includes: a varistor RV1 and a fuse element F1.

[0069] The first end of the varistor RV1 is connected to the second end of the switch 14 , the second end of the varistor RV1 and the first end of the fuse element F1 are both connected to the reference ground, and the second end of the fuse element F1 is connected to the single-fire mains input port.

[0070] The fuse element F1 and the varistor RV1 are used to prevent the input voltage from being too high, protect the internal components, and prevent lightning.

[0071] In some embodiments, when there are two single-pole AC power output ports, the protection module 15 includes two varistors, the first end of each varistor is connected to each single-pole AC power output port, and the second end of each varistor is connected to the single-pole AC power input port through the fuse element F1. Figure 4 In the single-fire power supply circuit embodiment, there are two single-fire AC power output ports JD1 and JD2, and the protection module includes a first varistor RV1, a second varistor RV2 and a fuse element F1. The first end of the first varistor RV1 is connected to the first single-fire AC power output port JD1, the first end of the second varistor RV2 is connected to the second single-fire AC power output port JD2, the second end of the first varistor RV1 is connected to the second end of the second varistor RV2 and then connected to the reference ground, and the single-fire AC power input port JL1 is connected to the reference ground through the fuse element F1.

[0072] In some embodiments, the output voltage of the off-state single-fire power supply module 12 is 9V, and the rated voltage of the farad capacitor is 4.5V.

[0073] The above embodiments are further described below in conjunction with specific applications. Figure 5When the voltage at the output end of the current limiting unit 131 is higher than 6.9V, the charging control unit 132 is turned on to charge the farad capacitor. When the voltage at the output end of the current limiting unit 131 is lower than 6.9V, the charging control unit 132 is disconnected and stops charging the farad capacitor. At this time, the farad capacitor releases electrical energy to power external devices.

[0074] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A single fire power supply circuit, It is characterized in that include: Open state single fire power supply module; The open state single-fire power supply module has a first end connected to the first end of the switch, a second end connected to the reference ground, and a third end connected to an external device; the reference ground is connected to the single-fire mains input port; the second end of the switch is connected to the single-fire mains output port; The open state single-fire power supply module is used to supply power to the external device when the switch is in the closed state; The open-state single-fire power supply module includes: a second rectifier unit, a voltage feedback unit and a switch control unit; The second rectifier unit has an input end connected to the first end of the open-state single-fire power-taking module, and an output end connected to the input end of the voltage feedback unit and the third end of the open-state single-fire power-taking module respectively; the output end of the voltage feedback unit is connected to the control end of the switch control unit, and the input end of the switch control unit is connected to the first end of the open-state single-fire power-taking module; the second rectifier unit, the voltage feedback unit and the switch control unit are all connected to the reference ground; The voltage feedback unit includes: a voltage comparison element, a first voltage regulator diode, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor; The voltage comparison element, the voltage reference end is connected to the input end of the voltage feedback unit, the output end is connected to the output end of the voltage feedback unit through the first resistor, the positive input end is connected to the reference ground through the third resistor, the positive input end is also connected to the input end of the voltage feedback unit through the fourth resistor, the negative input end is connected to the input end of the voltage feedback unit through the fifth resistor, and the negative input end is also connected to the cathode of the first voltage stabilizing diode; The second resistor is connected in parallel between the output terminal of the voltage comparison element and the positive input terminal of the voltage comparison element; the anode of the first voltage stabilizing diode is connected to the reference ground; The switch control unit comprises: a sixth resistor, a first switch tube and a freewheeling diode; The control end of the first switch tube is connected to the control end of the switch control unit, the first end of the first switch tube is connected to the input end of the switch control unit, and the second end of the first switch tube is connected to the reference ground; the control end of the first switch tube is also connected to the reference ground through the sixth resistor; The anode of the freewheeling diode is connected to the reference ground, and the cathode of the freewheeling diode is connected to the input end of the switch control unit.

2. The single-fire power supply circuit according to claim 1, It is characterized in that Also includes: Off-state single-fire power supply module; The off-state single-fire power supply module has a first end connected to the second end of the switch, a second end connected to the reference ground, and a third end connected to the external device.

3. The single-fire power supply circuit as claimed in claim 2, It is characterized in that The off-state single-fire power supply module includes: a first rectifier unit and a voltage reduction unit; The input end of the first rectifier unit is connected to the first end of the off-state single-fire power supply module, the output end of the first rectifier unit is connected to the input end of the step-down unit, and the output end of the step-down unit is connected to the third end of the off-state single-fire power supply module; the first rectifier unit and the step-down unit are both connected to the reference ground.

4. The single-fire power supply circuit according to any one of claims 2 or 3, It is characterized in that Also includes: Power storage module; The input end of the power storage module is connected to the third end of the on-state single-fire power-taking module and the third end of the off-state single-fire power-taking module respectively, and the output end of the power storage module is connected to the external device.

5. The single-fire power supply circuit as claimed in claim 4, It is characterized in that The power storage module includes: a current limiting unit, a charging control unit and a charging balancing unit; The first input end of the current limiting unit is connected to the third end of the on-state single-fire power taking module, the second input end of the current limiting unit is connected to the third end of the off-state single-fire power taking module, the output end of the current limiting unit is connected to the input end of the charging control unit, and the output end of the charging control unit is connected to the charging balancing unit; The charging balancing unit includes a farad capacitor, the farad capacitor includes a first farad capacitor and a second farad capacitor, and the charging balancing unit is used to balance the voltage of the first farad capacitor and the voltage of the second farad capacitor.

6. The single-fire power supply circuit as claimed in claim 5, It is characterized in that The current limiting unit includes: a current limiting voltage stabilizing element, a first diode, a seventh resistor, an eighth resistor and a first capacitor; The anode of the first diode is connected to the first input terminal of the current limiting unit, and the cathode of the first diode is connected to the cathode terminal of the current limiting and voltage stabilizing element through the seventh resistor; The positive input terminal of the current limiting and voltage stabilizing element is respectively connected to the enabling terminal of the current limiting and voltage stabilizing element, the second input terminal of the current limiting unit and the first terminal of the first capacitor, and the second terminal of the first capacitor is connected to the reference ground; The output end of the current limiting and voltage stabilizing element is respectively connected to the feedback end of the current limiting and voltage stabilizing element and the first end of the eighth resistor, and the second end of the eighth resistor is respectively connected to the negative end of the current limiting and voltage stabilizing element and the output end of the current limiting unit.

7. The single-fire power supply circuit according to claim 5, It is characterized in that The charging control unit includes: a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a ninth resistor, a tenth resistor, an eleventh resistor, a second voltage stabilizing diode, a second diode, a first voltage detection element and a switching voltage stabilizing element; The first end of the second capacitor is connected to the cathode of the second voltage stabilizing diode and the input end of the charging control unit respectively, and the second end of the second capacitor is connected to the reference ground; The anode of the second voltage stabilizing diode is connected to the input terminal of the first voltage detection element and the input terminal of the switching voltage stabilizing element respectively, the ground terminal of the first voltage detection element is connected to the reference ground, the output terminal of the first voltage detection element is connected to the enable terminal of the switching voltage stabilizing element through the ninth resistor, the first terminal of the third capacitor is connected to the anode of the second voltage stabilizing diode, and the second terminal of the third capacitor is connected to the reference ground; The fifth capacitor is connected in parallel between the input end of the switching voltage stabilizing element and the negative terminal of the switching voltage stabilizing element, the first end of the fourth capacitor is connected to the enable end of the switching voltage stabilizing element, and the second end of the fourth capacitor is connected to the reference ground; the tenth resistor is connected in parallel between the output end of the switching voltage stabilizing element and the feedback end of the switching voltage stabilizing element, and the feedback end of the switching voltage stabilizing element is connected to the reference ground through the eleventh resistor; the first end of the sixth capacitor is connected to the output end of the switching voltage stabilizing element, and the second end of the sixth capacitor is connected to the reference ground; The output end of the switching voltage stabilizing element is connected to the anode of the second diode, and the cathode of the second diode is connected to the output end of the charging control unit.

8. The single-fire power supply circuit according to claim 5, It is characterized in that The charging balance unit further includes: a second voltage detection element, a third voltage detection element, a second switch tube, a third switch tube, a twelfth resistor and a thirteenth resistor; The output end of the charging control unit is connected to the input end of the second voltage detection element, the output end of the second voltage detection element is connected to the control end of the second switch tube, the input end of the second voltage detection element is connected to the first end of the second switch tube through a twelfth resistor, and the second end of the second switch tube is connected to the ground end of the second voltage detection element; the first farad capacitor is connected in parallel between the input end of the second voltage detection element and the ground end of the second voltage detection element; The input end of the third voltage detection element is connected to the ground end of the second voltage detection element, the output end of the third voltage detection element is connected to the control end of the third switch tube, the input end of the third voltage detection element is connected to the first end of the third switch tube through the thirteenth resistor, and the second end of the third switch tube is connected to the ground end of the third voltage detection element; the second farad capacitor is connected in parallel between the input end of the third voltage detection element and the ground end of the third voltage detection element, and the ground end of the third voltage detection element is connected to the reference ground.

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